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10516 10517 10518 10519 10520 10521 10522 10523 10524 10525 10526 10527 10528 10529 10530 10531 10532 10533 10534 10535 10536 10537 10538 10539 10540 10541 10542 10543 10544 10545 10546 10547 10548 10549 10550 10551 10552 10553 10554 10555 10556 10557 10558 10559 10560 10561 10562 10563 10564 10565 10566 10567 10568 10569 10570 10571 10572 10573 10574 10575 10576 10577 10578 10579 10580 10581 10582 10583 10584 10585 10586 10587 10588 10589 10590 10591 10592 10593 10594 10595 10596 10597 10598 10599 10600 10601 10602 10603 10604 10605 10606 10607 10608 10609 10610 10611 10612 10613 10614 10615 | /* * Copyright (c) 2004-2025 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */ /* * Copyright 2001 Wasabi Systems, Inc. * All rights reserved. * * Written by Jason R. Thorpe for Wasabi Systems, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed for the NetBSD Project by * Wasabi Systems, Inc. * 4. The name of Wasabi Systems, Inc. may not be used to endorse * or promote products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net) * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp */ /* * Network interface bridge support. * * TODO: * * - Currently only supports Ethernet-like interfaces (Ethernet, * 802.11, VLANs on Ethernet, etc.) Figure out a nice way * to bridge other types of interfaces (FDDI-FDDI, and maybe * consider heterogenous bridges). * * - GIF isn't handled due to the lack of IPPROTO_ETHERIP support. */ #include <sys/cdefs.h> #include <sys/param.h> #include <sys/mbuf.h> #include <sys/malloc.h> #include <sys/protosw.h> #include <sys/systm.h> #include <sys/time.h> #include <sys/socket.h> /* for net/if.h */ #include <sys/sockio.h> #include <sys/kernel.h> #include <sys/random.h> #include <sys/syslog.h> #include <sys/sysctl.h> #include <sys/proc.h> #include <sys/lock.h> #include <sys/mcache.h> #include <sys/kauth.h> #include <kern/thread_call.h> #include <libkern/libkern.h> #include <kern/uipc_domain.h> #include <kern/zalloc.h> #if NBPFILTER > 0 #include <net/bpf.h> #endif #include <net/if.h> #include <net/if_dl.h> #include <net/if_types.h> #include <net/if_var.h> #include <net/if_media.h> #include <net/net_api_stats.h> #include <netinet/in.h> /* for struct arpcom */ #include <netinet/tcp.h> /* for struct tcphdr */ #include <netinet/in_systm.h> #include <netinet/in_var.h> #define _IP_VHL #include <netinet/ip.h> #include <netinet/ip_var.h> #include <netinet/ip6.h> #include <netinet6/ip6_var.h> #include <netinet/if_ether.h> /* for struct arpcom */ #include <net/bridgestp.h> #include <net/if_bridgevar.h> #include <net/if_llc.h> #if NVLAN > 0 #include <net/if_vlan_var.h> #endif /* NVLAN > 0 */ #include <net/if_ether.h> #include <net/dlil.h> #include <net/kpi_interfacefilter.h> #include <net/pfvar.h> #include <net/route.h> #include <net/droptap.h> #include <dev/random/randomdev.h> #include <netinet/bootp.h> #include <netinet/dhcp.h> #if SKYWALK #include <skywalk/nexus/netif/nx_netif.h> #endif /* SKYWALK */ #include <net/sockaddr_utils.h> #include <net/mblist.h> #include <os/log.h> #define _TSO_CSUM (CSUM_TSO_IPV4 | CSUM_TSO_IPV6) static struct in_addr inaddr_any = { .s_addr = INADDR_ANY }; #define __M_FLAGS_ARE_SET(m, flags) (((m)->m_flags & (flags)) != 0) #define IS_BCAST(m) __M_FLAGS_ARE_SET(m, M_BCAST) #define IS_MCAST(m) __M_FLAGS_ARE_SET(m, M_MCAST) #define IS_BCAST_MCAST(m) __M_FLAGS_ARE_SET(m, M_BCAST | M_MCAST) #define HTONS_ETHERTYPE_ARP htons(ETHERTYPE_ARP) #define HTONS_ETHERTYPE_IP htons(ETHERTYPE_IP) #define HTONS_ETHERTYPE_IPV6 htons(ETHERTYPE_IPV6) #define HTONS_ARPHRD_ETHER htons(ARPHRD_ETHER) #define HTONS_ARPOP_REQUEST htons(ARPOP_REQUEST) #define HTONS_ARPOP_REPLY htons(ARPOP_REPLY) #define HTONS_IPPORT_BOOTPC htons(IPPORT_BOOTPC) #define HTONS_IPPORT_BOOTPS htons(IPPORT_BOOTPS) #define HTONS_DHCP_FLAGS_BROADCAST htons(DHCP_FLAGS_BROADCAST) /* * if_bridge_debug, BR_DBGF_* * - 'if_bridge_debug' is a bitmask of BR_DBGF_* flags that can be set * to enable additional logs for the corresponding bridge function * - "sysctl net.link.bridge.debug" controls the value of * 'if_bridge_debug' */ static uint32_t if_bridge_debug = 0; #define BR_DBGF_LIFECYCLE 0x0001 #define BR_DBGF_INPUT 0x0002 #define BR_DBGF_OUTPUT 0x0004 #define BR_DBGF_RT_TABLE 0x0008 #define BR_DBGF_DELAYED_CALL 0x0010 #define BR_DBGF_IOCTL 0x0020 #define BR_DBGF_MBUF 0x0040 #define BR_DBGF_MCAST 0x0080 #define BR_DBGF_HOSTFILTER 0x0100 #define BR_DBGF_CHECKSUM 0x0200 #define BR_DBGF_MAC_NAT 0x0400 #define BR_DBGF_INPUT_LIST 0x0800 /* * if_bridge_log_level * - 'if_bridge_log_level' ensures that by default important logs are * logged regardless of if_bridge_debug by comparing the log level * in BRIDGE_LOG to if_bridge_log_level * - use "sysctl net.link.bridge.log_level" controls the value of * 'if_bridge_log_level' * - the default value of 'if_bridge_log_level' is LOG_NOTICE; important * logs must use LOG_NOTICE to ensure they appear by default */ static int if_bridge_log_level = LOG_NOTICE; #define BRIDGE_DBGF_ENABLED(__flag) ((if_bridge_debug & __flag) != 0) /* * BRIDGE_LOG, BRIDGE_LOG_SIMPLE * - macros to generate the specified log conditionally based on * the specified log level and debug flags * - BRIDGE_LOG_SIMPLE does not include the function name in the log */ #define BRIDGE_LOG(__level, __dbgf, __string, ...) \ do { \ if (__level <= if_bridge_log_level || \ BRIDGE_DBGF_ENABLED(__dbgf)) { \ os_log(OS_LOG_DEFAULT, "%s: " __string, \ __func__, ## __VA_ARGS__); \ } \ } while (0) #define BRIDGE_LOG_SIMPLE(__level, __dbgf, __string, ...) \ do { \ if (__level <= if_bridge_log_level || \ BRIDGE_DBGF_ENABLED(__dbgf)) { \ os_log(OS_LOG_DEFAULT, __string, ## __VA_ARGS__); \ } \ } while (0) #define _BRIDGE_LOCK(_sc) lck_mtx_lock(&(_sc)->sc_mtx) #define _BRIDGE_UNLOCK(_sc) lck_mtx_unlock(&(_sc)->sc_mtx) #define BRIDGE_LOCK_ASSERT_HELD(_sc) \ LCK_MTX_ASSERT(&(_sc)->sc_mtx, LCK_MTX_ASSERT_OWNED) #define BRIDGE_LOCK_ASSERT_NOTHELD(_sc) \ LCK_MTX_ASSERT(&(_sc)->sc_mtx, LCK_MTX_ASSERT_NOTOWNED) #define BRIDGE_LOCK_DEBUG 1 #if BRIDGE_LOCK_DEBUG #define BR_LCKDBG_MAX 4 #define BRIDGE_LOCK(_sc) bridge_lock(_sc) #define BRIDGE_UNLOCK(_sc) bridge_unlock(_sc) #define BRIDGE_LOCK2REF(_sc, _err) _err = bridge_lock2ref(_sc) #define BRIDGE_UNREF(_sc) bridge_unref(_sc) #define BRIDGE_XLOCK(_sc) bridge_xlock(_sc) #define BRIDGE_XDROP(_sc) bridge_xdrop(_sc) #else /* !BRIDGE_LOCK_DEBUG */ #define BRIDGE_LOCK(_sc) _BRIDGE_LOCK(_sc) #define BRIDGE_UNLOCK(_sc) _BRIDGE_UNLOCK(_sc) #define BRIDGE_LOCK2REF(_sc, _err) do { \ BRIDGE_LOCK_ASSERT_HELD(_sc); \ if ((_sc)->sc_iflist_xcnt > 0) \ (_err) = EBUSY; \ else { \ (_sc)->sc_iflist_ref++; \ (_err) = 0; \ } \ _BRIDGE_UNLOCK(_sc); \ } while (0) #define BRIDGE_UNREF(_sc) do { \ _BRIDGE_LOCK(_sc); \ (_sc)->sc_iflist_ref--; \ if (((_sc)->sc_iflist_xcnt > 0) && ((_sc)->sc_iflist_ref == 0)) { \ _BRIDGE_UNLOCK(_sc); \ wakeup(&(_sc)->sc_cv); \ } else \ _BRIDGE_UNLOCK(_sc); \ } while (0) #define BRIDGE_XLOCK(_sc) do { \ BRIDGE_LOCK_ASSERT_HELD(_sc); \ (_sc)->sc_iflist_xcnt++; \ while ((_sc)->sc_iflist_ref > 0) \ msleep(&(_sc)->sc_cv, &(_sc)->sc_mtx, PZERO, \ "BRIDGE_XLOCK", NULL); \ } while (0) #define BRIDGE_XDROP(_sc) do { \ BRIDGE_LOCK_ASSERT_HELD(_sc); \ (_sc)->sc_iflist_xcnt--; \ } while (0) #endif /* BRIDGE_LOCK_DEBUG */ #define BRIDGE_BPF_TAP_IN(ifp, m) \ do { \ if (ifp->if_bpf != NULL) { \ bpf_tap_in(ifp, DLT_EN10MB, m, NULL, 0); \ } \ } while(0) #define BRIDGE_BPF_TAP_OUT(ifp, m) \ do { \ if (ifp->if_bpf != NULL) { \ bpf_tap_out(ifp, DLT_EN10MB, m, NULL, 0); \ } \ } while(0) /* * Initial size of the route hash table. Must be a power of two. */ #ifndef BRIDGE_RTHASH_SIZE #define BRIDGE_RTHASH_SIZE 16 #endif /* * Maximum size of the routing hash table */ #define BRIDGE_RTHASH_SIZE_MAX 2048 #define BRIDGE_RTHASH_MASK(sc) ((sc)->sc_rthash_size - 1) /* * Maximum number of addresses to cache. */ #ifndef BRIDGE_RTABLE_MAX #define BRIDGE_RTABLE_MAX 100 #endif /* * Timeout (in seconds) for entries learned dynamically. */ #ifndef BRIDGE_RTABLE_TIMEOUT #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ #endif /* * Number of seconds between walks of the route list. */ #ifndef BRIDGE_RTABLE_PRUNE_PERIOD #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) #endif /* * Number of MAC NAT entries * - sized based on 16 clients (including MAC NAT interface) * each with 4 addresses */ #ifndef BRIDGE_MAC_NAT_ENTRY_MAX #define BRIDGE_MAC_NAT_ENTRY_MAX 64 #endif /* BRIDGE_MAC_NAT_ENTRY_MAX */ /* * List of capabilities to possibly mask on the member interface. */ #define BRIDGE_IFCAPS_MASK (IFCAP_TSO | IFCAP_TXCSUM) /* * List of capabilities to disable on the member interface. */ #define BRIDGE_IFCAPS_STRIP IFCAP_LRO /* * Bridge interface list entry. */ struct bridge_iflist { TAILQ_ENTRY(bridge_iflist) bif_next; struct ifnet *bif_ifp; /* member if */ struct bstp_port bif_stp; /* STP state */ uint32_t bif_ifflags; /* member if flags */ int bif_savedcaps; /* saved capabilities */ uint32_t bif_addrmax; /* max # of addresses */ uint32_t bif_addrcnt; /* cur. # of addresses */ uint32_t bif_addrexceeded; /* # of address violations */ interface_filter_t bif_iff_ref; struct bridge_softc *bif_sc; uint32_t bif_flags; /* host filter */ struct in_addr bif_hf_ipsrc; uint8_t bif_hf_hwsrc[ETHER_ADDR_LEN]; struct ifbrmstats bif_stats; }; static inline bool bif_ifflags_are_set(struct bridge_iflist * bif, uint32_t flags) { return (bif->bif_ifflags & flags) != 0; } static inline bool bif_has_checksum_offload(struct bridge_iflist * bif) { return bif_ifflags_are_set(bif, IFBIF_CHECKSUM_OFFLOAD); } static inline bool bif_has_mac_nat(struct bridge_iflist * bif) { return bif_ifflags_are_set(bif, IFBIF_MAC_NAT); } static inline bool bif_uses_virtio(struct bridge_iflist * bif) { return bif_ifflags_are_set(bif, IFBIF_USES_VIRTIO); } /* fake errors to make the code clearer */ #define _EBADIP EJUSTRETURN #define _EBADIPCHECKSUM EJUSTRETURN #define _EBADIPV6 EJUSTRETURN #define _EBADUDP EJUSTRETURN #define _EBADTCP EJUSTRETURN #define _EBADUDPCHECKSUM EJUSTRETURN #define _EBADTCPCHECKSUM EJUSTRETURN #define BIFF_PROMISC 0x01 /* promiscuous mode set */ #define BIFF_PROTO_ATTACHED 0x02 /* protocol attached */ #define BIFF_FILTER_ATTACHED 0x04 /* interface filter attached */ #define BIFF_MEDIA_ACTIVE 0x08 /* interface media active */ #define BIFF_HOST_FILTER 0x10 /* host filter enabled */ #define BIFF_HF_HWSRC 0x20 /* host filter source MAC is set */ #define BIFF_HF_IPSRC 0x40 /* host filter source IP is set */ #define BIFF_INPUT_BROADCAST 0x80 /* send broadcast packets in */ #define BIFF_IN_MEMBER_LIST 0x100 /* added to the member list */ #define BIFF_WIFI_INFRA 0x200 /* interface is Wi-Fi infra */ #define BIFF_ALL_MULTI 0x400 /* allmulti set */ #define BIFF_LRO_DISABLED 0x800 /* LRO was disabled */ #if SKYWALK #define BIFF_FLOWSWITCH_ATTACHED 0x1000 /* we attached the flowswitch */ #define BIFF_NETAGENT_REMOVED 0x2000 /* we removed the netagent */ #endif /* SKYWALK */ /* * mac_nat_entry * - translates between an IP address and MAC address on a specific * bridge interface member */ struct mac_nat_entry { LIST_ENTRY(mac_nat_entry) mne_list; /* list linkage */ struct bridge_iflist *mne_bif; /* originating interface */ unsigned long mne_expire; /* expiration time */ union { struct in_addr mneu_ip; /* originating IPv4 address */ struct in6_addr mneu_ip6; /* originating IPv6 address */ } mne_u; uint8_t mne_mac[ETHER_ADDR_LEN]; uint8_t mne_flags; uint8_t mne_reserved; }; #define mne_ip mne_u.mneu_ip #define mne_ip6 mne_u.mneu_ip6 #define MNE_FLAGS_IPV6 0x01 /* IPv6 address */ LIST_HEAD(mac_nat_entry_list, mac_nat_entry); /* * mac_nat_record * - used by bridge_mac_nat_output() to convey the translation that needs * to take place in bridge_mac_nat_translate * - holds enough information so that the translation can be done later * when the destination interface is the MAC-NAT interface */ struct mac_nat_record { uint16_t mnr_ether_type; union { uint16_t mnru_arp_offset; struct { uint16_t mnruip_dhcp_flags; uint16_t mnruip_udp_csum; uint8_t mnruip_header_len; } mnru_ip; struct { uint16_t mnruip6_icmp6_len; uint16_t mnruip6_lladdr_offset; uint8_t mnruip6_icmp6_type; uint8_t mnruip6_header_len; } mnru_ip6; } mnr_u; }; #define mnr_arp_offset mnr_u.mnru_arp_offset #define mnr_ip_header_len mnr_u.mnru_ip.mnruip_header_len #define mnr_ip_dhcp_flags mnr_u.mnru_ip.mnruip_dhcp_flags #define mnr_ip_udp_csum mnr_u.mnru_ip.mnruip_udp_csum #define mnr_ip6_icmp6_len mnr_u.mnru_ip6.mnruip6_icmp6_len #define mnr_ip6_icmp6_type mnr_u.mnru_ip6.mnruip6_icmp6_type #define mnr_ip6_header_len mnr_u.mnru_ip6.mnruip6_header_len #define mnr_ip6_lladdr_offset mnr_u.mnru_ip6.mnruip6_lladdr_offset /* * Bridge route node. */ struct bridge_rtnode { LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ struct bridge_iflist *brt_dst; /* destination if */ unsigned long brt_expire; /* expiration time */ uint8_t brt_flags; /* address flags */ uint8_t brt_addr[ETHER_ADDR_LEN]; uint16_t brt_vlan; /* vlan id */ }; #define brt_ifp brt_dst->bif_ifp /* * Bridge delayed function call context */ typedef void (*bridge_delayed_func_t)(struct bridge_softc *); struct bridge_delayed_call { struct bridge_softc *bdc_sc; bridge_delayed_func_t bdc_func; /* Function to call */ struct timespec bdc_ts; /* Time to call */ u_int32_t bdc_flags; thread_call_t bdc_thread_call; }; #define BDCF_OUTSTANDING 0x01 /* Delayed call has been scheduled */ #define BDCF_CANCELLING 0x02 /* May be waiting for call completion */ /* * Software state for each bridge. */ LIST_HEAD(_bridge_rtnode_list, bridge_rtnode); struct bridge_softc { struct ifnet *sc_ifp; /* make this an interface */ uint32_t sc_flags; LIST_ENTRY(bridge_softc) sc_list; decl_lck_mtx_data(, sc_mtx); struct _bridge_rtnode_list * __counted_by(sc_rthash_size) sc_rthash; /* our forwarding table */ struct _bridge_rtnode_list sc_rtlist; /* list version of above */ uint32_t sc_rthash_key; /* key for hash */ uint32_t sc_rthash_size; /* size of the hash table */ struct bridge_delayed_call sc_aging_timer; struct bridge_delayed_call sc_resize_call; TAILQ_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ struct bstp_state sc_stp; /* STP state */ void *sc_cv; uint32_t sc_brtmax; /* max # of addresses */ uint32_t sc_brtcnt; /* cur. # of addresses */ uint32_t sc_brttimeout; /* rt timeout in seconds */ uint32_t sc_iflist_ref; /* refcount for sc_iflist */ uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */ TAILQ_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ uint32_t sc_brtexceeded; /* # of cache drops */ uint32_t sc_filter_flags; /* ipf and flags */ struct ifnet *sc_ifaddr; /* member mac copied from */ u_char sc_defaddr[6]; /* Default MAC address */ char sc_if_xname[IFNAMSIZ]; struct bridge_iflist *sc_mac_nat_bif; /* single MAC NAT interface */ struct mac_nat_entry_list sc_mne_list; /* MAC NAT IPv4 */ struct mac_nat_entry_list sc_mne_list_v6;/* MAC NAT IPv6 */ uint32_t sc_mne_max; /* max # of entries */ uint32_t sc_mne_count; /* cur. # of entries */ uint32_t sc_mne_allocation_failures; #if BRIDGE_LOCK_DEBUG /* * Locking and unlocking calling history */ void *lock_lr[BR_LCKDBG_MAX]; int next_lock_lr; void *unlock_lr[BR_LCKDBG_MAX]; int next_unlock_lr; #endif /* BRIDGE_LOCK_DEBUG */ }; #define SCF_DETACHING 0x01 #define SCF_RESIZING 0x02 #define SCF_MEDIA_ACTIVE 0x04 #define SCF_PROTO_ATTACHED 0x08 typedef enum { CHECKSUM_OPERATION_NONE = 0, CHECKSUM_OPERATION_CLEAR_OFFLOAD = 1, CHECKSUM_OPERATION_FINALIZE = 2, CHECKSUM_OPERATION_COMPUTE = 3, } ChecksumOperation; typedef struct { u_int ip_hlen; /* IP header length */ u_int ip_pay_len; /* length of payload (exclusive of ip_hlen) */ u_int ip_m0_len; /* bytes available at ip_hdr (without jumping mbufs) */ u_int ip_opt_len; /* IPv6 options headers length */ uint8_t ip_proto; /* IPPROTO_TCP, IPPROTO_UDP, etc. */ bool ip_is_ipv4; bool ip_is_fragmented; uint8_t *__sized_by(ip_m0_len) ip_hdr; /* pointer to IP header */ uint8_t *__indexable ip_proto_hdr; /* ptr to protocol header (TCP) */ } ip_packet_info, *ip_packet_info_t; struct bridge_hostfilter_stats bridge_hostfilter_stats; typedef uint8_t ether_type_flag_t; typedef enum { pkt_direction_RX, pkt_direction_TX } pkt_direction_t; static LCK_GRP_DECLARE(bridge_lock_grp, "if_bridge"); #if BRIDGE_LOCK_DEBUG static LCK_ATTR_DECLARE(bridge_lock_attr, 0, 0); #else static LCK_ATTR_DECLARE(bridge_lock_attr, LCK_ATTR_DEBUG, 0); #endif static LCK_MTX_DECLARE_ATTR(bridge_list_mtx, &bridge_lock_grp, &bridge_lock_attr); static int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; static KALLOC_TYPE_DEFINE(bridge_rtnode_pool, struct bridge_rtnode, NET_KT_DEFAULT); static KALLOC_TYPE_DEFINE(bridge_mne_pool, struct mac_nat_entry, NET_KT_DEFAULT); static int bridge_clone_create(struct if_clone *, uint32_t, void *); static int bridge_clone_destroy(struct ifnet *); static errno_t bridge_ioctl(struct ifnet *, u_long cmd, void *__sized_by(IOCPARM_LEN(cmd))); #if HAS_IF_CAP static void bridge_mutecaps(struct bridge_softc *); static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, int); #endif static errno_t bridge_set_tso(struct bridge_softc *); static void bridge_proto_attach_changed(struct ifnet *); static int bridge_init(struct ifnet *); static void bridge_ifstop(struct ifnet *, int); static int bridge_output(struct ifnet *, struct mbuf *); static void bridge_finalize_cksum(struct ifnet *, struct mbuf *); static void bridge_start(struct ifnet *); static mblist bridge_input_list(struct bridge_softc *, ifnet_t, struct ether_header *, mblist, bool); static errno_t bridge_iff_input(void *, ifnet_t, protocol_family_t, mbuf_t *, char **); static errno_t bridge_iff_output(void *, ifnet_t, protocol_family_t, mbuf_t *); static errno_t bridge_member_output(struct bridge_softc *sc, ifnet_t ifp, mbuf_t *m); static int bridge_enqueue(ifnet_t, ifnet_t, ifnet_t, ether_type_flag_t, mbuf_t, ChecksumOperation, pkt_direction_t); static mbuf_t bridge_checksum_offload_list(ifnet_t, struct bridge_iflist *, mbuf_t, bool); static mbuf_t bridge_filter_checksum(ifnet_t, struct bridge_iflist * bif, mbuf_t m, bool, bool, bool); static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); static void bridge_aging_timer(struct bridge_softc *sc); static void bridge_broadcast(struct bridge_softc *, struct bridge_iflist *, ether_type_flag_t, mbuf_t); static void bridge_broadcast_list(struct bridge_softc *, struct bridge_iflist *, ether_type_flag_t, mbuf_t, pkt_direction_t); static void bridge_span(struct bridge_softc *, ether_type_flag_t, struct mbuf *); static int bridge_rtupdate(struct bridge_softc *, const uint8_t[ETHER_ADDR_LEN], uint16_t, struct bridge_iflist *, int, uint8_t); static struct bridge_iflist * bridge_rtlookup_bif(struct bridge_softc *, const uint8_t[ETHER_ADDR_LEN], uint16_t); static void bridge_rttrim(struct bridge_softc *); static void bridge_rtage(struct bridge_softc *); static void bridge_rtflush(struct bridge_softc *, int); static int bridge_rtdaddr(struct bridge_softc *, const uint8_t[ETHER_ADDR_LEN], uint16_t); static int bridge_rtable_init(struct bridge_softc *); static void bridge_rtable_fini(struct bridge_softc *); static void bridge_rthash_resize(struct bridge_softc *); static int bridge_rtnode_addr_cmp(const uint8_t[ETHER_ADDR_LEN], const uint8_t[ETHER_ADDR_LEN]); static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, const uint8_t[ETHER_ADDR_LEN], uint16_t); static int bridge_rtnode_hash(struct bridge_softc *, struct bridge_rtnode *); static int bridge_rtnode_insert(struct bridge_softc *, struct bridge_rtnode *); static void bridge_rtnode_destroy(struct bridge_softc *, struct bridge_rtnode *); #if BRIDGESTP static void bridge_rtable_expire(struct ifnet *, int); static void bridge_state_change(struct ifnet *, int); #endif /* BRIDGESTP */ static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, char * __sized_by(IFNAMSIZ) name); static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, struct ifnet *ifp); static void bridge_delete_member(struct bridge_softc *, struct bridge_iflist *); static void bridge_delete_span(struct bridge_softc *, struct bridge_iflist *); static int bridge_ioctl_add(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_del(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_gifflags(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_sifflags(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_scache(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_gcache(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_gifs32(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_gifs64(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_rts32(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_rts64(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_saddr32(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_saddr64(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_sto(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_gto(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_daddr32(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_daddr64(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_flush(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_gpri(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_spri(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_ght(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_sht(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_gfd(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_sfd(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_gma(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_sma(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_sifprio(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_sifcost(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_addspan(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_delspan(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_gbparam32(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_gbparam64(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_grte(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_gifsstp32(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_gifsstp64(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_sproto(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_stxhc(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_purge(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_gfilt(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_sfilt(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_ghostfilter(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_shostfilter(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_gmnelist32(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_gmnelist64(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_gifstats32(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_ioctl_gifstats64(struct bridge_softc *, void *__sized_by(arg_len) arg, size_t arg_len); static int bridge_pf(struct mbuf **, struct ifnet *, uint32_t sc_filter_flags, bool input); static int bridge_ip_checkbasic(struct mbuf **); static int bridge_ip6_checkbasic(struct mbuf **); static void bridge_detach(ifnet_t); static void bridge_link_event(struct ifnet *, u_int32_t); static void bridge_iflinkevent(struct ifnet *); static u_int32_t bridge_updatelinkstatus(struct bridge_softc *); static int interface_media_active(struct ifnet *); static void bridge_schedule_delayed_call(struct bridge_delayed_call *); static void bridge_cancel_delayed_call(struct bridge_delayed_call *); static void bridge_cleanup_delayed_call(struct bridge_delayed_call *); static errno_t bridge_mac_nat_enable(struct bridge_softc *, struct bridge_iflist *); static void bridge_mac_nat_disable(struct bridge_softc *sc); static void bridge_mac_nat_age_entries(struct bridge_softc *sc, unsigned long); static void bridge_mac_nat_populate_entries(struct bridge_softc *sc); static void bridge_mac_nat_flush_entries(struct bridge_softc *sc, struct bridge_iflist *); static mbuf_t bridge_mac_nat_input(struct bridge_softc *, ifnet_t, mbuf_t, ifnet_t * dst_if); static boolean_t bridge_mac_nat_output(struct bridge_softc *, struct bridge_iflist *, mbuf_t *, struct mac_nat_record *); static void bridge_mac_nat_translate(mbuf_t *, struct mac_nat_record *, const char[ETHER_ADDR_LEN]); static mblist bridge_mac_nat_input_list(struct bridge_softc *sc, ifnet_t external_ifp, mbuf_t m, mbuf_t * forward_head); static mbuf_t bridge_mac_nat_translate_list(struct bridge_softc * sc, struct bridge_iflist *sbif, ifnet_t dst_if, mbuf_t m); static mbuf_t bridge_mac_nat_copy_and_translate_list(struct bridge_softc * sc, struct bridge_iflist *sbif, ifnet_t dst_if, mbuf_t m); static mbuf_t bridge_pf_list_out(mbuf_t m, ifnet_t ifp, uint32_t sc_filter_flags); static inline ifnet_t bridge_rtlookup(struct bridge_softc *sc, const uint8_t addr[ETHER_ADDR_LEN], uint16_t vlan) { struct bridge_iflist * bif; ifnet_t ifp = NULL; bif = bridge_rtlookup_bif(sc, addr, vlan); if (bif != NULL) { ifp = bif->bif_ifp; } return ifp; } static bool in_addr_is_ours(const struct in_addr); static bool in6_addr_is_ours(const struct in6_addr *, uint32_t); #define m_copypacket(m, how) m_copym(m, 0, M_COPYALL, how) static mblist gso_tcp(ifnet_t ifp, mbuf_t m, u_int mac_hlen, bool is_ipv4, bool is_tx); static mblist gso_tcp_with_info(ifnet_t ifp, mbuf_t m, ip_packet_info_t info_p, u_int mac_hlen, bool is_ipv4, bool is_tx); static inline mblist gso_tcp_transmit(ifnet_t ifp, mbuf_t m, u_int mac_hlen, bool is_ipv4) { return gso_tcp(ifp, m, mac_hlen, is_ipv4, true); } /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ #define VLANTAGOF(_m) 0 #define BSTP_ETHERADDR_RANGE_FIRST 0x00 #define BSTP_ETHERADDR_RANGE_LAST 0x0f u_int8_t bstp_etheraddr[ETHER_ADDR_LEN] = { 0x01, 0x80, 0xc2, 0x00, 0x00, BSTP_ETHERADDR_RANGE_FIRST }; static u_int8_t ethernulladdr[ETHER_ADDR_LEN] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; #if BRIDGESTP static struct bstp_cb_ops bridge_ops = { .bcb_state = bridge_state_change, .bcb_rtage = bridge_rtable_expire }; #endif /* BRIDGESTP */ SYSCTL_DECL(_net_link); SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW | CTLFLAG_LOCKED, 0, "Bridge"); static int bridge_inherit_mac = 0; /* share MAC with first bridge member */ SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW | CTLFLAG_LOCKED, &bridge_inherit_mac, 0, "Inherit MAC address from the first bridge member"); SYSCTL_INT(_net_link_bridge, OID_AUTO, rtable_prune_period, CTLFLAG_RW | CTLFLAG_LOCKED, &bridge_rtable_prune_period, 0, "Interval between pruning of routing table"); static unsigned int bridge_rtable_hash_size_max = BRIDGE_RTHASH_SIZE_MAX; SYSCTL_UINT(_net_link_bridge, OID_AUTO, rtable_hash_size_max, CTLFLAG_RW | CTLFLAG_LOCKED, &bridge_rtable_hash_size_max, 0, "Maximum size of the routing hash table"); #if BRIDGE_DELAYED_CALLBACK_DEBUG static int bridge_delayed_callback_delay = 0; SYSCTL_INT(_net_link_bridge, OID_AUTO, delayed_callback_delay, CTLFLAG_RW | CTLFLAG_LOCKED, &bridge_delayed_callback_delay, 0, "Delay before calling delayed function"); #endif SYSCTL_STRUCT(_net_link_bridge, OID_AUTO, hostfilterstats, CTLFLAG_RD | CTLFLAG_LOCKED, &bridge_hostfilter_stats, bridge_hostfilter_stats, ""); #if BRIDGESTP static int log_stp = 0; /* log STP state changes */ SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW, &log_stp, 0, "Log STP state changes"); #endif /* BRIDGESTP */ struct bridge_control { int (*bc_func)(struct bridge_softc *, void *__sized_by(arg_len) args, size_t arg_len); unsigned int bc_argsize; unsigned int bc_flags; }; #define BC_F_COPYIN 0x01 /* copy arguments in */ #define BC_F_COPYOUT 0x02 /* copy arguments out */ #define BC_F_SUSER 0x04 /* do super-user check */ static const struct bridge_control bridge_control_table32[] = { { .bc_func = bridge_ioctl_add, .bc_argsize = sizeof(struct ifbreq), /* 0 */ .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_del, .bc_argsize = sizeof(struct ifbreq), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_gifflags, .bc_argsize = sizeof(struct ifbreq), .bc_flags = BC_F_COPYIN | BC_F_COPYOUT }, { .bc_func = bridge_ioctl_sifflags, .bc_argsize = sizeof(struct ifbreq), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_scache, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_gcache, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYOUT }, { .bc_func = bridge_ioctl_gifs32, .bc_argsize = sizeof(struct ifbifconf32), .bc_flags = BC_F_COPYIN | BC_F_COPYOUT }, { .bc_func = bridge_ioctl_rts32, .bc_argsize = sizeof(struct ifbaconf32), .bc_flags = BC_F_COPYIN | BC_F_COPYOUT }, { .bc_func = bridge_ioctl_saddr32, .bc_argsize = sizeof(struct ifbareq32), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_sto, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_gto, .bc_argsize = sizeof(struct ifbrparam), /* 10 */ .bc_flags = BC_F_COPYOUT }, { .bc_func = bridge_ioctl_daddr32, .bc_argsize = sizeof(struct ifbareq32), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_flush, .bc_argsize = sizeof(struct ifbreq), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_gpri, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYOUT }, { .bc_func = bridge_ioctl_spri, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_ght, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYOUT }, { .bc_func = bridge_ioctl_sht, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_gfd, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYOUT }, { .bc_func = bridge_ioctl_sfd, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_gma, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYOUT }, { .bc_func = bridge_ioctl_sma, .bc_argsize = sizeof(struct ifbrparam), /* 20 */ .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_sifprio, .bc_argsize = sizeof(struct ifbreq), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_sifcost, .bc_argsize = sizeof(struct ifbreq), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_gfilt, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYOUT }, { .bc_func = bridge_ioctl_sfilt, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_purge, .bc_argsize = sizeof(struct ifbreq), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_addspan, .bc_argsize = sizeof(struct ifbreq), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_delspan, .bc_argsize = sizeof(struct ifbreq), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_gbparam32, .bc_argsize = sizeof(struct ifbropreq32), .bc_flags = BC_F_COPYOUT }, { .bc_func = bridge_ioctl_grte, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYOUT }, { .bc_func = bridge_ioctl_gifsstp32, .bc_argsize = sizeof(struct ifbpstpconf32), /* 30 */ .bc_flags = BC_F_COPYIN | BC_F_COPYOUT }, { .bc_func = bridge_ioctl_sproto, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_stxhc, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_sifmaxaddr, .bc_argsize = sizeof(struct ifbreq), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_ghostfilter, .bc_argsize = sizeof(struct ifbrhostfilter), .bc_flags = BC_F_COPYIN | BC_F_COPYOUT }, { .bc_func = bridge_ioctl_shostfilter, .bc_argsize = sizeof(struct ifbrhostfilter), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_gmnelist32, .bc_argsize = sizeof(struct ifbrmnelist32), .bc_flags = BC_F_COPYIN | BC_F_COPYOUT }, { .bc_func = bridge_ioctl_gifstats32, .bc_argsize = sizeof(struct ifbrmreq32), .bc_flags = BC_F_COPYIN | BC_F_COPYOUT }, }; static const struct bridge_control bridge_control_table64[] = { { .bc_func = bridge_ioctl_add, .bc_argsize = sizeof(struct ifbreq), /* 0 */ .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_del, .bc_argsize = sizeof(struct ifbreq), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_gifflags, .bc_argsize = sizeof(struct ifbreq), .bc_flags = BC_F_COPYIN | BC_F_COPYOUT }, { .bc_func = bridge_ioctl_sifflags, .bc_argsize = sizeof(struct ifbreq), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_scache, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_gcache, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYOUT }, { .bc_func = bridge_ioctl_gifs64, .bc_argsize = sizeof(struct ifbifconf64), .bc_flags = BC_F_COPYIN | BC_F_COPYOUT }, { .bc_func = bridge_ioctl_rts64, .bc_argsize = sizeof(struct ifbaconf64), .bc_flags = BC_F_COPYIN | BC_F_COPYOUT }, { .bc_func = bridge_ioctl_saddr64, .bc_argsize = sizeof(struct ifbareq64), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_sto, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_gto, .bc_argsize = sizeof(struct ifbrparam), /* 10 */ .bc_flags = BC_F_COPYOUT }, { .bc_func = bridge_ioctl_daddr64, .bc_argsize = sizeof(struct ifbareq64), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_flush, .bc_argsize = sizeof(struct ifbreq), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_gpri, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYOUT }, { .bc_func = bridge_ioctl_spri, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_ght, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYOUT }, { .bc_func = bridge_ioctl_sht, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_gfd, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYOUT }, { .bc_func = bridge_ioctl_sfd, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_gma, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYOUT }, { .bc_func = bridge_ioctl_sma, .bc_argsize = sizeof(struct ifbrparam), /* 20 */ .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_sifprio, .bc_argsize = sizeof(struct ifbreq), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_sifcost, .bc_argsize = sizeof(struct ifbreq), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_gfilt, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYOUT }, { .bc_func = bridge_ioctl_sfilt, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_purge, .bc_argsize = sizeof(struct ifbreq), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_addspan, .bc_argsize = sizeof(struct ifbreq), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_delspan, .bc_argsize = sizeof(struct ifbreq), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_gbparam64, .bc_argsize = sizeof(struct ifbropreq64), .bc_flags = BC_F_COPYOUT }, { .bc_func = bridge_ioctl_grte, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYOUT }, { .bc_func = bridge_ioctl_gifsstp64, .bc_argsize = sizeof(struct ifbpstpconf64), /* 30 */ .bc_flags = BC_F_COPYIN | BC_F_COPYOUT }, { .bc_func = bridge_ioctl_sproto, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_stxhc, .bc_argsize = sizeof(struct ifbrparam), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_sifmaxaddr, .bc_argsize = sizeof(struct ifbreq), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_ghostfilter, .bc_argsize = sizeof(struct ifbrhostfilter), .bc_flags = BC_F_COPYIN | BC_F_COPYOUT }, { .bc_func = bridge_ioctl_shostfilter, .bc_argsize = sizeof(struct ifbrhostfilter), .bc_flags = BC_F_COPYIN | BC_F_SUSER }, { .bc_func = bridge_ioctl_gmnelist64, .bc_argsize = sizeof(struct ifbrmnelist64), .bc_flags = BC_F_COPYIN | BC_F_COPYOUT }, { .bc_func = bridge_ioctl_gifstats64, .bc_argsize = sizeof(struct ifbrmreq64), .bc_flags = BC_F_COPYIN | BC_F_COPYOUT }, }; static const unsigned int bridge_control_table_size = sizeof(bridge_control_table32) / sizeof(bridge_control_table32[0]); static LIST_HEAD(, bridge_softc) bridge_list = LIST_HEAD_INITIALIZER(bridge_list); #define BRIDGENAME "bridge" #define BRIDGES_MAX IF_MAXUNIT #define BRIDGE_ZONE_MAX_ELEM MIN(IFNETS_MAX, BRIDGES_MAX) static struct if_clone bridge_cloner = IF_CLONE_INITIALIZER(BRIDGENAME, bridge_clone_create, bridge_clone_destroy, 0, BRIDGES_MAX); static int if_bridge_txstart = 0; SYSCTL_INT(_net_link_bridge, OID_AUTO, txstart, CTLFLAG_RW | CTLFLAG_LOCKED, &if_bridge_txstart, 0, "Bridge interface uses TXSTART model"); SYSCTL_INT(_net_link_bridge, OID_AUTO, debug, CTLFLAG_RW | CTLFLAG_LOCKED, &if_bridge_debug, 0, "Bridge debug flags"); SYSCTL_INT(_net_link_bridge, OID_AUTO, log_level, CTLFLAG_RW | CTLFLAG_LOCKED, &if_bridge_log_level, 0, "Bridge log level"); static int if_bridge_output_skip_filters = 1; SYSCTL_INT(_net_link_bridge, OID_AUTO, output_skip_filters, CTLFLAG_RW | CTLFLAG_LOCKED, &if_bridge_output_skip_filters, 0, "Bridge skip output filters"); int bridge_enable_early_input = 1; /* DLIL early input */ SYSCTL_INT(_net_link_bridge, OID_AUTO, enable_early_input, CTLFLAG_RW | CTLFLAG_LOCKED, &bridge_enable_early_input, 0, "Bridge enable early input"); int bridge_allow_lro_num_seg = 1; /* allow LRO_NUM_SEG to keep LRO enabled */ SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_lro_num_seg, CTLFLAG_RW | CTLFLAG_LOCKED, &bridge_allow_lro_num_seg, 0, "Bridge allow LRO_NUM_SEG to keep LRO enabled"); #define BRIDGE_TSO_REDUCE_MSS_FORWARDING_MAX 256 #define BRIDGE_TSO_REDUCE_MSS_FORWARDING_DEFAULT 110 #define BRIDGE_TSO_REDUCE_MSS_TX_MAX 256 #define BRIDGE_TSO_REDUCE_MSS_TX_DEFAULT 0 static u_int if_bridge_tso_reduce_mss_forwarding = BRIDGE_TSO_REDUCE_MSS_FORWARDING_DEFAULT; static u_int if_bridge_tso_reduce_mss_tx = BRIDGE_TSO_REDUCE_MSS_TX_DEFAULT; static int bridge_tso_reduce_mss(struct sysctl_req *req, u_int * val, u_int val_max) { int changed; int error; u_int new_value; error = sysctl_io_number(req, *val, sizeof(*val), &new_value, &changed); if (error == 0 && changed != 0) { if (new_value > val_max) { return EINVAL; } *val = new_value; } return error; } static int bridge_tso_reduce_mss_forwarding_sysctl SYSCTL_HANDLER_ARGS { return bridge_tso_reduce_mss(req, &if_bridge_tso_reduce_mss_forwarding, BRIDGE_TSO_REDUCE_MSS_FORWARDING_MAX); } SYSCTL_PROC(_net_link_bridge, OID_AUTO, tso_reduce_mss_forwarding, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, 0, 0, bridge_tso_reduce_mss_forwarding_sysctl, "IU", "Bridge tso reduce mss when forwarding"); static int bridge_tso_reduce_mss_tx_sysctl SYSCTL_HANDLER_ARGS { return bridge_tso_reduce_mss(req, &if_bridge_tso_reduce_mss_tx, BRIDGE_TSO_REDUCE_MSS_TX_MAX); } SYSCTL_PROC(_net_link_bridge, OID_AUTO, tso_reduce_mss_tx, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, 0, 0, bridge_tso_reduce_mss_tx_sysctl, "IU", "Bridge tso reduce mss on transmit"); #if DEBUG || DEVELOPMENT /* * net.link.bridge.reduce_tso_mtu * - when non-zero, the bridge overrides the interface TSO MTU to a lower * value (i.e. 16K) to enable testing the "use GSO instead" path */ static int if_bridge_reduce_tso_mtu = 0; SYSCTL_INT(_net_link_bridge, OID_AUTO, reduce_tso_mtu, CTLFLAG_RW | CTLFLAG_LOCKED, &if_bridge_reduce_tso_mtu, 0, "Bridge interface reduce TSO MTU"); #endif /* DEBUG || DEVELOPMENT */ static void brlog_ether_header(struct ether_header *); static void brlog_mbuf_data(mbuf_t, size_t, size_t); static void brlog_mbuf_pkthdr(mbuf_t, const char *, const char *); static void brlog_mbuf(mbuf_t, const char *, const char *); static void brlog_link(struct bridge_softc * sc); #if BRIDGE_LOCK_DEBUG static void bridge_lock(struct bridge_softc *); static void bridge_unlock(struct bridge_softc *); static int bridge_lock2ref(struct bridge_softc *); static void bridge_unref(struct bridge_softc *); static void bridge_xlock(struct bridge_softc *); static void bridge_xdrop(struct bridge_softc *); #define DECL_RETURN_ADDR(v) void * __single v = __unsafe_forge_single(void *, __builtin_return_address(0)) static void bridge_lock(struct bridge_softc *sc) { DECL_RETURN_ADDR(lr_saved); BRIDGE_LOCK_ASSERT_NOTHELD(sc); _BRIDGE_LOCK(sc); sc->lock_lr[sc->next_lock_lr] = lr_saved; sc->next_lock_lr = (sc->next_lock_lr + 1) % SO_LCKDBG_MAX; } static void bridge_unlock(struct bridge_softc *sc) { DECL_RETURN_ADDR(lr_saved); BRIDGE_LOCK_ASSERT_HELD(sc); sc->unlock_lr[sc->next_unlock_lr] = lr_saved; sc->next_unlock_lr = (sc->next_unlock_lr + 1) % SO_LCKDBG_MAX; _BRIDGE_UNLOCK(sc); } static int bridge_lock2ref(struct bridge_softc *sc) { int error = 0; DECL_RETURN_ADDR(lr_saved); BRIDGE_LOCK_ASSERT_HELD(sc); if (sc->sc_iflist_xcnt > 0) { error = EBUSY; } else { sc->sc_iflist_ref++; } sc->unlock_lr[sc->next_unlock_lr] = lr_saved; sc->next_unlock_lr = (sc->next_unlock_lr + 1) % SO_LCKDBG_MAX; _BRIDGE_UNLOCK(sc); return error; } static void bridge_unref(struct bridge_softc *sc) { DECL_RETURN_ADDR(lr_saved); BRIDGE_LOCK_ASSERT_NOTHELD(sc); _BRIDGE_LOCK(sc); sc->lock_lr[sc->next_lock_lr] = lr_saved; sc->next_lock_lr = (sc->next_lock_lr + 1) % SO_LCKDBG_MAX; sc->sc_iflist_ref--; sc->unlock_lr[sc->next_unlock_lr] = lr_saved; sc->next_unlock_lr = (sc->next_unlock_lr + 1) % SO_LCKDBG_MAX; if ((sc->sc_iflist_xcnt > 0) && (sc->sc_iflist_ref == 0)) { _BRIDGE_UNLOCK(sc); wakeup(&sc->sc_cv); } else { _BRIDGE_UNLOCK(sc); } } static void bridge_xlock(struct bridge_softc *sc) { DECL_RETURN_ADDR(lr_saved); BRIDGE_LOCK_ASSERT_HELD(sc); sc->sc_iflist_xcnt++; while (sc->sc_iflist_ref > 0) { sc->unlock_lr[sc->next_unlock_lr] = lr_saved; sc->next_unlock_lr = (sc->next_unlock_lr + 1) % SO_LCKDBG_MAX; msleep(&sc->sc_cv, &sc->sc_mtx, PZERO, "BRIDGE_XLOCK", NULL); sc->lock_lr[sc->next_lock_lr] = lr_saved; sc->next_lock_lr = (sc->next_lock_lr + 1) % SO_LCKDBG_MAX; } } #undef DECL_RETURN_ADDR static void bridge_xdrop(struct bridge_softc *sc) { BRIDGE_LOCK_ASSERT_HELD(sc); sc->sc_iflist_xcnt--; } #endif /* BRIDGE_LOCK_DEBUG */ static void brlog_mbuf_pkthdr(mbuf_t m, const char *prefix, const char *suffix) { if (m) { BRIDGE_LOG_SIMPLE(LOG_NOTICE, 0, "%spktlen: %u rcvif: 0x%llx header: 0x%llx nextpkt: 0x%llx%s", prefix ? prefix : "", (unsigned int)mbuf_pkthdr_len(m), (uint64_t)VM_KERNEL_ADDRPERM(mbuf_pkthdr_rcvif(m)), (uint64_t)VM_KERNEL_ADDRPERM(mbuf_pkthdr_header(m)), (uint64_t)VM_KERNEL_ADDRPERM(mbuf_nextpkt(m)), suffix ? suffix : ""); } else { BRIDGE_LOG_SIMPLE(LOG_NOTICE, 0, "%s<NULL>%s", prefix, suffix); } } static void brlog_mbuf(mbuf_t m, const char *prefix, const char *suffix) { if (m) { BRIDGE_LOG_SIMPLE(LOG_NOTICE, 0, "%s0x%llx type: %u flags: 0x%x len: %u data: 0x%llx " "maxlen: %u datastart: 0x%llx next: 0x%llx%s", prefix ? prefix : "", (uint64_t)VM_KERNEL_ADDRPERM(m), mbuf_type(m), mbuf_flags(m), (unsigned int)mbuf_len(m), (uint64_t)VM_KERNEL_ADDRPERM(mtod(m, void *)), (unsigned int)mbuf_maxlen(m), (uint64_t)VM_KERNEL_ADDRPERM(mbuf_datastart(m)), (uint64_t)VM_KERNEL_ADDRPERM(mbuf_next(m)), !suffix || (mbuf_flags(m) & MBUF_PKTHDR) ? "" : suffix); if ((mbuf_flags(m) & MBUF_PKTHDR)) { brlog_mbuf_pkthdr(m, "", suffix); } } else { BRIDGE_LOG_SIMPLE(LOG_NOTICE, 0, "%s<NULL>%s", prefix, suffix); } } static void brlog_mbuf_data(mbuf_t m, size_t offset, size_t len) { mbuf_t n; size_t i, j; size_t pktlen, mlen, maxlen; unsigned char *ptr; pktlen = mbuf_pkthdr_len(m); if (offset > pktlen) { return; } maxlen = (pktlen - offset > len) ? len : pktlen - offset; n = m; mlen = mbuf_len(n); ptr = mtod(n, unsigned char *); for (i = 0, j = 0; i < maxlen; i++, j++) { if (j >= mlen) { n = mbuf_next(n); if (n == 0) { break; } ptr = mtod(n, unsigned char *); mlen = mbuf_len(n); j = 0; } if (i >= offset) { BRIDGE_LOG_SIMPLE(LOG_NOTICE, 0, "%02x%s", ptr[j], i % 2 ? " " : ""); } } } static void brlog_ether_header(struct ether_header *eh) { BRIDGE_LOG_SIMPLE(LOG_NOTICE, 0, "%02x:%02x:%02x:%02x:%02x:%02x > " "%02x:%02x:%02x:%02x:%02x:%02x 0x%04x ", eh->ether_shost[0], eh->ether_shost[1], eh->ether_shost[2], eh->ether_shost[3], eh->ether_shost[4], eh->ether_shost[5], eh->ether_dhost[0], eh->ether_dhost[1], eh->ether_dhost[2], eh->ether_dhost[3], eh->ether_dhost[4], eh->ether_dhost[5], ntohs(eh->ether_type)); } static char * ether_ntop(char * __sized_by(len) buf, size_t len, const u_char ap[ETHER_ADDR_LEN]) { snprintf(buf, len, "%02x:%02x:%02x:%02x:%02x:%02x", ap[0], ap[1], ap[2], ap[3], ap[4], ap[5]); return buf; } static void brlog_link(struct bridge_softc * sc) { int i; uint32_t sdl_buffer[(offsetof(struct sockaddr_dl, sdl_data) + IFNAMSIZ + ETHER_ADDR_LEN)]; struct sockaddr_dl *sdl = SDL((uint8_t*)&sdl_buffer); /* SDL requires byte pointer */ const u_char * lladdr; char lladdr_str[48]; memset(sdl_buffer, 0, sizeof(sdl_buffer)); sdl->sdl_family = AF_LINK; sdl->sdl_nlen = strbuflen(sc->sc_if_xname); sdl->sdl_alen = ETHER_ADDR_LEN; sdl->sdl_len = offsetof(struct sockaddr_dl, sdl_data); memcpy(sdl->sdl_data, sc->sc_if_xname, sdl->sdl_nlen); memcpy(LLADDR(sdl), sc->sc_defaddr, ETHER_ADDR_LEN); lladdr_str[0] = '\0'; for (i = 0, lladdr = CONST_LLADDR(sdl); i < sdl->sdl_alen; i++, lladdr++) { char byte_str[4]; snprintf(byte_str, sizeof(byte_str), "%s%x", i ? ":" : "", *lladdr); strbufcat(lladdr_str, byte_str); } BRIDGE_LOG_SIMPLE(LOG_NOTICE, 0, "%s sdl len %d index %d family %d type 0x%x nlen %d alen %d" " slen %d addr %s", sc->sc_if_xname, sdl->sdl_len, sdl->sdl_index, sdl->sdl_family, sdl->sdl_type, sdl->sdl_nlen, sdl->sdl_alen, sdl->sdl_slen, lladdr_str); } static int _mbuf_get_tso_mss(mbuf_t m) { int mss = 0; if ((m->m_pkthdr.csum_flags & _TSO_CSUM) != 0) { mss = m->m_pkthdr.tso_segsz; } return mss; } /* * bridgeattach: * * Pseudo-device attach routine. */ __private_extern__ int bridgeattach(int n) { #pragma unused(n) int error; LIST_INIT(&bridge_list); #if BRIDGESTP bstp_sys_init(); #endif /* BRIDGESTP */ error = if_clone_attach(&bridge_cloner); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, 0, "ifnet_clone_attach failed %d", error); } return error; } static void _mbuf_adjust_pkthdr_and_data(mbuf_t m, int len) { mbuf_setdata(m, mtodo(m, len), mbuf_len(m) - len); mbuf_pkthdr_adjustlen(m, -len); } static errno_t bridge_ifnet_set_attrs(struct ifnet * ifp) { errno_t error; error = ifnet_set_mtu(ifp, ETHERMTU); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, 0, "ifnet_set_mtu failed %d", error); goto done; } error = ifnet_set_addrlen(ifp, ETHER_ADDR_LEN); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, 0, "ifnet_set_addrlen failed %d", error); goto done; } error = ifnet_set_hdrlen(ifp, ETHER_HDR_LEN); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, 0, "ifnet_set_hdrlen failed %d", error); goto done; } error = ifnet_set_flags(ifp, IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS | IFF_MULTICAST, 0xffff); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, 0, "ifnet_set_flags failed %d", error); goto done; } done: return error; } static void bridge_interface_proto_attach_changed(ifnet_t ifp) { uint32_t proto_count; struct bridge_softc * __single sc = ifp->if_softc; proto_count = if_get_protolist(ifp, NULL, 0); BRIDGE_LOG(LOG_DEBUG, BR_DBGF_LIFECYCLE, "%s: proto count %d", ifp->if_xname, proto_count); if (sc == NULL) { return; } BRIDGE_LOCK(sc); if ((sc->sc_flags & SCF_DETACHING) != 0) { BRIDGE_UNLOCK(sc); return; } if (proto_count >= 2) { /* an upper layer protocol is attached */ sc->sc_flags |= SCF_PROTO_ATTACHED; BRIDGE_LOG(LOG_DEBUG, BR_DBGF_LIFECYCLE, "%s: setting SCF_PROTO_ATTACHED", ifp->if_xname); } else { /* an upper layer protocol was detached */ sc->sc_flags &= ~SCF_PROTO_ATTACHED; BRIDGE_LOG(LOG_DEBUG, BR_DBGF_LIFECYCLE, "%s: clearing SCF_PROTO_ATTACHED", ifp->if_xname); } BRIDGE_UNLOCK(sc); } static void bridge_interface_event(struct ifnet * ifp, __unused protocol_family_t protocol, const struct kev_msg * event) { int event_code; if (event->vendor_code != KEV_VENDOR_APPLE || event->kev_class != KEV_NETWORK_CLASS || event->kev_subclass != KEV_DL_SUBCLASS) { return; } event_code = event->event_code; switch (event_code) { case KEV_DL_PROTO_DETACHED: case KEV_DL_PROTO_ATTACHED: bridge_interface_proto_attach_changed(ifp); break; default: break; } return; } /* * Function: bridge_interface_attach_protocol * Purpose: * Attach a protocol to the bridge to get events on the interface, * in particular, whether protocols are attached/detached. */ static int bridge_interface_attach_protocol(ifnet_t ifp) { int error; struct ifnet_attach_proto_param_v2 reg; bzero(®, sizeof(reg)); reg.event = bridge_interface_event; error = ifnet_attach_protocol_v2(ifp, PF_BRIDGE, ®); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_LIFECYCLE, "%s: ifnet_attach_protocol failed, %d", ifp->if_xname, error); } return error; } static void bridge_interface_detach_protocol(ifnet_t ifp) { (void)ifnet_detach_protocol(ifp, PF_BRIDGE); } /* * bridge_clone_create: * * Create a new bridge instance. */ static int bridge_clone_create(struct if_clone *ifc, uint32_t unit, void *params) { #pragma unused(params) ifnet_ref_t ifp = NULL; struct bridge_softc *sc = NULL; struct bridge_softc *sc2 = NULL; struct ifnet_init_eparams init_params; errno_t error = 0; uint8_t eth_hostid[ETHER_ADDR_LEN]; int fb, retry, has_hostid; sc = kalloc_type(struct bridge_softc, Z_WAITOK_ZERO_NOFAIL); lck_mtx_init(&sc->sc_mtx, &bridge_lock_grp, &bridge_lock_attr); sc->sc_brtmax = BRIDGE_RTABLE_MAX; sc->sc_mne_max = BRIDGE_MAC_NAT_ENTRY_MAX; sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; sc->sc_filter_flags = 0; TAILQ_INIT(&sc->sc_iflist); /* use the interface name as the unique id for ifp recycle */ snprintf(sc->sc_if_xname, sizeof(sc->sc_if_xname), "%s%d", ifc->ifc_name, unit); bzero(&init_params, sizeof(init_params)); init_params.ver = IFNET_INIT_CURRENT_VERSION; init_params.len = sizeof(init_params); /* Initialize our routing table. */ error = bridge_rtable_init(sc); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, 0, "bridge_rtable_init failed %d", error); goto done; } TAILQ_INIT(&sc->sc_spanlist); if (if_bridge_txstart) { init_params.start = bridge_start; } else { init_params.flags = IFNET_INIT_LEGACY; init_params.output = bridge_output; } init_params.uniqueid_len = strbuflen(sc->sc_if_xname); init_params.uniqueid = sc->sc_if_xname; init_params.sndq_maxlen = IFQ_MAXLEN; init_params.name = __unsafe_null_terminated_from_indexable(ifc->ifc_name); init_params.unit = unit; init_params.family = IFNET_FAMILY_ETHERNET; init_params.type = IFT_BRIDGE; init_params.demux = ether_demux; init_params.add_proto = ether_add_proto; init_params.del_proto = ether_del_proto; init_params.check_multi = ether_check_multi; init_params.framer_extended = ether_frameout_extended; init_params.softc = sc; init_params.ioctl = bridge_ioctl; init_params.detach = bridge_detach; init_params.broadcast_addr = etherbroadcastaddr; init_params.broadcast_len = ETHER_ADDR_LEN; error = ifnet_allocate_extended(&init_params, &ifp); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, 0, "ifnet_allocate failed %d", error); goto done; } LIST_INIT(&sc->sc_mne_list); LIST_INIT(&sc->sc_mne_list_v6); sc->sc_ifp = ifp; error = bridge_ifnet_set_attrs(ifp); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, 0, "bridge_ifnet_set_attrs failed %d", error); goto done; } /* * Generate an ethernet address with a locally administered address. * * Since we are using random ethernet addresses for the bridge, it is * possible that we might have address collisions, so make sure that * this hardware address isn't already in use on another bridge. * The first try uses the "hostid" and falls back to read_frandom(); * for "hostid", we use the MAC address of the first-encountered * Ethernet-type interface that is currently configured. */ fb = 0; has_hostid = (uuid_get_ethernet(ð_hostid[0]) == 0); for (retry = 1; retry != 0;) { if (fb || has_hostid == 0) { read_frandom(&sc->sc_defaddr, ETHER_ADDR_LEN); sc->sc_defaddr[0] &= ~1; /* clear multicast bit */ sc->sc_defaddr[0] |= 2; /* set the LAA bit */ } else { bcopy(ð_hostid[0], &sc->sc_defaddr, ETHER_ADDR_LEN); sc->sc_defaddr[0] &= ~1; /* clear multicast bit */ sc->sc_defaddr[0] |= 2; /* set the LAA bit */ sc->sc_defaddr[3] = /* stir it up a bit */ ((sc->sc_defaddr[3] & 0x0f) << 4) | ((sc->sc_defaddr[3] & 0xf0) >> 4); /* * Mix in the LSB as it's actually pretty significant, * see rdar://14076061 */ sc->sc_defaddr[4] = (((sc->sc_defaddr[4] & 0x0f) << 4) | ((sc->sc_defaddr[4] & 0xf0) >> 4)) ^ sc->sc_defaddr[5]; sc->sc_defaddr[5] = ifp->if_unit & 0xff; } fb = 1; retry = 0; lck_mtx_lock(&bridge_list_mtx); LIST_FOREACH(sc2, &bridge_list, sc_list) { if (_ether_cmp(sc->sc_defaddr, IF_LLADDR(sc2->sc_ifp)) == 0) { retry = 1; } } lck_mtx_unlock(&bridge_list_mtx); } sc->sc_flags &= ~SCF_MEDIA_ACTIVE; if (BRIDGE_DBGF_ENABLED(BR_DBGF_LIFECYCLE)) { brlog_link(sc); } error = ifnet_attach(ifp, NULL); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, 0, "ifnet_attach failed %d", error); goto done; } (void)bridge_interface_attach_protocol(ifp); error = ifnet_set_lladdr_and_type(ifp, sc->sc_defaddr, ETHER_ADDR_LEN, IFT_ETHER); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, 0, "ifnet_set_lladdr_and_type failed %d", error); goto done; } ifnet_set_offload(ifp, IFNET_CSUM_IP | IFNET_CSUM_TCP | IFNET_CSUM_UDP | IFNET_CSUM_TCPIPV6 | IFNET_CSUM_UDPIPV6 | IFNET_MULTIPAGES); error = bridge_set_tso(sc); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, 0, "bridge_set_tso failed %d", error); goto done; } #if BRIDGESTP bstp_attach(&sc->sc_stp, &bridge_ops); #endif /* BRIDGESTP */ lck_mtx_lock(&bridge_list_mtx); LIST_INSERT_HEAD(&bridge_list, sc, sc_list); lck_mtx_unlock(&bridge_list_mtx); /* attach as ethernet */ error = bpf_attach(ifp, DLT_EN10MB, sizeof(struct ether_header), NULL, NULL); done: if (error != 0) { if (ifp != NULL) { bridge_interface_detach_protocol(ifp); } BRIDGE_LOG(LOG_NOTICE, 0, "failed error %d", error); /* TBD: Clean up: sc, sc_rthash etc */ } return error; } /* * bridge_clone_destroy: * * Destroy a bridge instance. */ static int bridge_clone_destroy(struct ifnet *ifp) { struct bridge_softc * __single sc = ifp->if_softc; struct bridge_iflist *bif; errno_t error; bridge_interface_detach_protocol(ifp); BRIDGE_LOCK(sc); if ((sc->sc_flags & SCF_DETACHING)) { BRIDGE_UNLOCK(sc); return 0; } sc->sc_flags |= SCF_DETACHING; bridge_ifstop(ifp, 1); bridge_cancel_delayed_call(&sc->sc_resize_call); bridge_cleanup_delayed_call(&sc->sc_resize_call); bridge_cleanup_delayed_call(&sc->sc_aging_timer); error = ifnet_set_flags(ifp, 0, IFF_UP); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, 0, "ifnet_set_flags failed %d", error); } while ((bif = TAILQ_FIRST(&sc->sc_iflist)) != NULL) { bridge_delete_member(sc, bif); } while ((bif = TAILQ_FIRST(&sc->sc_spanlist)) != NULL) { bridge_delete_span(sc, bif); } BRIDGE_UNLOCK(sc); error = ifnet_detach(ifp); if (error != 0) { panic("%s (%d): ifnet_detach(%p) failed %d", __func__, __LINE__, ifp, error); } return 0; } #define DRVSPEC do { \ if (ifd->ifd_cmd >= bridge_control_table_size) { \ error = EINVAL; \ break; \ } \ bc = &bridge_control_table[ifd->ifd_cmd]; \ \ if (cmd == SIOCGDRVSPEC && \ (bc->bc_flags & BC_F_COPYOUT) == 0) { \ error = EINVAL; \ break; \ } else if (cmd == SIOCSDRVSPEC && \ (bc->bc_flags & BC_F_COPYOUT) != 0) { \ error = EINVAL; \ break; \ } \ \ if (bc->bc_flags & BC_F_SUSER) { \ error = kauth_authorize_generic(kauth_cred_get(), \ KAUTH_GENERIC_ISSUSER); \ if (error) \ break; \ } \ \ if (ifd->ifd_len != bc->bc_argsize || \ ifd->ifd_len > sizeof (args)) { \ error = EINVAL; \ break; \ } \ \ bzero(&args, sizeof (args)); \ if (bc->bc_flags & BC_F_COPYIN) { \ error = copyin(ifd->ifd_data, &args, ifd->ifd_len); \ if (error) \ break; \ } \ \ BRIDGE_LOCK(sc); \ error = (*bc->bc_func)(sc, &args, sizeof(args)); \ BRIDGE_UNLOCK(sc); \ if (error) \ break; \ \ if (bc->bc_flags & BC_F_COPYOUT) \ error = copyout(&args, ifd->ifd_data, ifd->ifd_len); \ } while (0) static boolean_t interface_needs_input_broadcast(struct ifnet * ifp) { /* * Selectively enable input broadcast only when necessary. * The bridge interface itself attaches a fake protocol * so checking for at least two protocols means that the * interface is being used for something besides bridging * and needs to see broadcast packets from other members. */ return if_get_protolist(ifp, NULL, 0) >= 2; } static boolean_t bif_set_input_broadcast(struct bridge_iflist * bif, boolean_t input_broadcast) { boolean_t old_input_broadcast; old_input_broadcast = (bif->bif_flags & BIFF_INPUT_BROADCAST) != 0; if (input_broadcast) { bif->bif_flags |= BIFF_INPUT_BROADCAST; } else { bif->bif_flags &= ~BIFF_INPUT_BROADCAST; } return old_input_broadcast != input_broadcast; } /* * bridge_ioctl: * * Handle a control request from the operator. */ static errno_t bridge_ioctl(struct ifnet *ifp, u_long cmd, void *__sized_by(IOCPARM_LEN(cmd)) data) { struct bridge_softc * __single sc = ifp->if_softc; struct ifreq *ifr = (struct ifreq *)data; struct bridge_iflist *bif; int error = 0; BRIDGE_LOCK_ASSERT_NOTHELD(sc); BRIDGE_LOG(LOG_DEBUG, BR_DBGF_IOCTL, "ifp %s cmd 0x%08lx (%c%c [%lu] %c %lu)", ifp->if_xname, cmd, (cmd & IOC_IN) ? 'I' : ' ', (cmd & IOC_OUT) ? 'O' : ' ', IOCPARM_LEN(cmd), (char)IOCGROUP(cmd), cmd & 0xff); switch (cmd) { case SIOCSIFADDR: case SIOCAIFADDR: ifnet_set_flags(ifp, IFF_UP, IFF_UP); break; case SIOCGIFMEDIA32: case SIOCGIFMEDIA64: { // cast to 32bit version to work within bounds with 32bit userspace struct ifmediareq32 *ifmr = (struct ifmediareq32 *)data; user_addr_t user_addr; user_addr = (cmd == SIOCGIFMEDIA64) ? ((struct ifmediareq64 *)data)->ifmu_ulist : CAST_USER_ADDR_T(((struct ifmediareq32 *)data)->ifmu_ulist); ifmr->ifm_status = IFM_AVALID; ifmr->ifm_mask = 0; ifmr->ifm_count = 1; BRIDGE_LOCK(sc); if (!(sc->sc_flags & SCF_DETACHING) && (sc->sc_flags & SCF_MEDIA_ACTIVE)) { ifmr->ifm_status |= IFM_ACTIVE; ifmr->ifm_active = ifmr->ifm_current = IFM_ETHER | IFM_AUTO; } else { ifmr->ifm_active = ifmr->ifm_current = IFM_NONE; } BRIDGE_UNLOCK(sc); if (user_addr != USER_ADDR_NULL) { error = copyout(&ifmr->ifm_current, user_addr, sizeof(int)); } break; } case SIOCADDMULTI: case SIOCDELMULTI: break; case SIOCSDRVSPEC32: case SIOCGDRVSPEC32: { union { struct ifbreq ifbreq; struct ifbifconf32 ifbifconf; struct ifbareq32 ifbareq; struct ifbaconf32 ifbaconf; struct ifbrparam ifbrparam; struct ifbropreq32 ifbropreq; } args; struct ifdrv32 *ifd = (struct ifdrv32 *)data; const struct bridge_control *bridge_control_table = bridge_control_table32, *bc; DRVSPEC; break; } case SIOCSDRVSPEC64: case SIOCGDRVSPEC64: { union { struct ifbreq ifbreq; struct ifbifconf64 ifbifconf; struct ifbareq64 ifbareq; struct ifbaconf64 ifbaconf; struct ifbrparam ifbrparam; struct ifbropreq64 ifbropreq; } args; struct ifdrv64 *ifd = (struct ifdrv64 *)data; const struct bridge_control *bridge_control_table = bridge_control_table64, *bc; DRVSPEC; break; } case SIOCSIFFLAGS: if (!(ifp->if_flags & IFF_UP) && (ifp->if_flags & IFF_RUNNING)) { /* * If interface is marked down and it is running, * then stop and disable it. */ BRIDGE_LOCK(sc); bridge_ifstop(ifp, 1); BRIDGE_UNLOCK(sc); } else if ((ifp->if_flags & IFF_UP) && !(ifp->if_flags & IFF_RUNNING)) { /* * If interface is marked up and it is stopped, then * start it. */ BRIDGE_LOCK(sc); error = bridge_init(ifp); BRIDGE_UNLOCK(sc); } break; case SIOCSIFLLADDR: error = ifnet_set_lladdr(ifp, ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_IOCTL, "%s SIOCSIFLLADDR error %d", ifp->if_xname, error); } break; case SIOCSIFMTU: if (ifr->ifr_mtu < 576) { error = EINVAL; break; } BRIDGE_LOCK(sc); if (TAILQ_EMPTY(&sc->sc_iflist)) { sc->sc_ifp->if_mtu = ifr->ifr_mtu; BRIDGE_UNLOCK(sc); break; } TAILQ_FOREACH(bif, &sc->sc_iflist, bif_next) { if (bif->bif_ifp->if_mtu != (unsigned)ifr->ifr_mtu) { BRIDGE_LOG(LOG_NOTICE, 0, "%s invalid MTU: %u(%s) != %d", sc->sc_ifp->if_xname, bif->bif_ifp->if_mtu, bif->bif_ifp->if_xname, ifr->ifr_mtu); error = EINVAL; break; } } if (!error) { sc->sc_ifp->if_mtu = ifr->ifr_mtu; } BRIDGE_UNLOCK(sc); break; default: error = ether_ioctl(ifp, cmd, data); if (error != 0 && error != EOPNOTSUPP) { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_IOCTL, "ifp %s cmd 0x%08lx " "(%c%c [%lu] %c %lu) failed error: %d", ifp->if_xname, cmd, (cmd & IOC_IN) ? 'I' : ' ', (cmd & IOC_OUT) ? 'O' : ' ', IOCPARM_LEN(cmd), (char)IOCGROUP(cmd), cmd & 0xff, error); } break; } BRIDGE_LOCK_ASSERT_NOTHELD(sc); return error; } #if HAS_IF_CAP /* * bridge_mutecaps: * * Clear or restore unwanted capabilities on the member interface */ static void bridge_mutecaps(struct bridge_softc *sc) { struct bridge_iflist *bif; int enabled, mask; /* Initial bitmask of capabilities to test */ mask = BRIDGE_IFCAPS_MASK; TAILQ_FOREACH(bif, &sc->sc_iflist, bif_next) { /* Every member must support it or its disabled */ mask &= bif->bif_savedcaps; } TAILQ_FOREACH(bif, &sc->sc_iflist, bif_next) { enabled = bif->bif_ifp->if_capenable; enabled &= ~BRIDGE_IFCAPS_STRIP; /* strip off mask bits and enable them again if allowed */ enabled &= ~BRIDGE_IFCAPS_MASK; enabled |= mask; bridge_set_ifcap(sc, bif, enabled); } } static void bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) { struct ifnet *ifp = bif->bif_ifp; struct ifreq ifr; int error; bzero(&ifr, sizeof(ifr)); ifr.ifr_reqcap = set; if (ifp->if_capenable != set) { IFF_LOCKGIANT(ifp); error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); IFF_UNLOCKGIANT(ifp); if (error) { BRIDGE_LOG(LOG_NOTICE, 0, "%s error setting interface capabilities on %s", sc->sc_ifp->if_xname, ifp->if_xname); } } } #endif /* HAS_IF_CAP */ static errno_t siocsifcap(struct ifnet * ifp, uint32_t cap_enable) { struct ifreq ifr; bzero(&ifr, sizeof(ifr)); ifr.ifr_reqcap = cap_enable; return ifnet_ioctl(ifp, 0, SIOCSIFCAP, &ifr); } static const char * enable_disable_str(boolean_t enable) { return (const char * __null_terminated)(enable ? "enable" : "disable"); } static boolean_t bridge_set_lro(struct ifnet * ifp, boolean_t enable) { uint32_t cap_enable; uint32_t cap_supported; boolean_t changed = FALSE; boolean_t lro_enabled; cap_supported = ifnet_capabilities_supported(ifp); if ((cap_supported & IFCAP_LRO) == 0) { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_LIFECYCLE, "%s doesn't support LRO", ifp->if_xname); goto done; } if (bridge_allow_lro_num_seg != 0 && (cap_supported & IFCAP_LRO_NUM_SEG) != 0) { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_LIFECYCLE, "%s supports LRO_NUM_SEG, leaving LRO enabled", ifp->if_xname); goto done; } cap_enable = ifnet_capabilities_enabled(ifp); lro_enabled = (cap_enable & IFCAP_LRO) != 0; if (lro_enabled != enable) { errno_t error; if (enable) { cap_enable |= IFCAP_LRO; } else { cap_enable &= ~IFCAP_LRO; } error = siocsifcap(ifp, cap_enable); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, 0, "%s %s failed (cap 0x%x) %d", ifp->if_xname, enable_disable_str(enable), cap_enable, error); } else { changed = TRUE; BRIDGE_LOG(LOG_NOTICE, BR_DBGF_LIFECYCLE, "%s %s success (cap 0x%x)", ifp->if_xname, enable_disable_str(enable), cap_enable); } } done: return changed; } static errno_t bridge_set_tso(struct bridge_softc *sc) { struct bridge_iflist *bif; u_int32_t tso_v4_mtu; u_int32_t tso_v6_mtu; ifnet_offload_t offload; errno_t error = 0; /* By default, support TSO */ offload = sc->sc_ifp->if_hwassist | IFNET_TSO_IPV4 | IFNET_TSO_IPV6; tso_v4_mtu = IP_MAXPACKET; tso_v6_mtu = IP_MAXPACKET; /* Use the lowest common denominator of the members */ TAILQ_FOREACH(bif, &sc->sc_iflist, bif_next) { ifnet_t ifp = bif->bif_ifp; if (ifp == NULL) { continue; } if (offload & IFNET_TSO_IPV4) { if (ifp->if_hwassist & IFNET_TSO_IPV4) { if (tso_v4_mtu > ifp->if_tso_v4_mtu) { tso_v4_mtu = ifp->if_tso_v4_mtu; } } else { offload &= ~IFNET_TSO_IPV4; tso_v4_mtu = 0; } } if (offload & IFNET_TSO_IPV6) { if (ifp->if_hwassist & IFNET_TSO_IPV6) { if (tso_v6_mtu > ifp->if_tso_v6_mtu) { tso_v6_mtu = ifp->if_tso_v6_mtu; } } else { offload &= ~IFNET_TSO_IPV6; tso_v6_mtu = 0; } } } if (offload != sc->sc_ifp->if_hwassist) { error = ifnet_set_offload(sc->sc_ifp, offload); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_LIFECYCLE, "ifnet_set_offload(%s, 0x%x) failed %d", sc->sc_ifp->if_xname, offload, error); goto done; } /* * For ifnet_set_tso_mtu() sake, the TSO MTU must be at least * as large as the interface MTU */ if (sc->sc_ifp->if_hwassist & IFNET_TSO_IPV4) { if (tso_v4_mtu < sc->sc_ifp->if_mtu) { tso_v4_mtu = sc->sc_ifp->if_mtu; } error = ifnet_set_tso_mtu(sc->sc_ifp, AF_INET, tso_v4_mtu); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_LIFECYCLE, "ifnet_set_tso_mtu(%s, " "AF_INET, %u) failed %d", sc->sc_ifp->if_xname, tso_v4_mtu, error); goto done; } } if (sc->sc_ifp->if_hwassist & IFNET_TSO_IPV6) { if (tso_v6_mtu < sc->sc_ifp->if_mtu) { tso_v6_mtu = sc->sc_ifp->if_mtu; } error = ifnet_set_tso_mtu(sc->sc_ifp, AF_INET6, tso_v6_mtu); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_LIFECYCLE, "ifnet_set_tso_mtu(%s, " "AF_INET6, %u) failed %d", sc->sc_ifp->if_xname, tso_v6_mtu, error); goto done; } } } done: return error; } static const char * sanitize_ifname(char * __sized_by(IFNAMSIZ) ifname) { ifname[IFNAMSIZ - 1] = '\0'; return __unsafe_null_terminated_from_indexable(ifname, &ifname[IFNAMSIZ - 1]); } /* * bridge_lookup_member: * * Lookup a bridge member interface. */ static struct bridge_iflist * bridge_lookup_member(struct bridge_softc *sc, char * __sized_by(IFNAMSIZ) name_unsanitized) { struct bridge_iflist *bif; struct ifnet *ifp; const char * __null_terminated name = sanitize_ifname(name_unsanitized); BRIDGE_LOCK_ASSERT_HELD(sc); TAILQ_FOREACH(bif, &sc->sc_iflist, bif_next) { ifp = bif->bif_ifp; if (strcmp(ifp->if_xname, name) == 0) { return bif; } } return NULL; } /* * bridge_lookup_member_if: * * Lookup a bridge member interface by ifnet*. */ static struct bridge_iflist * bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) { struct bridge_iflist *bif; BRIDGE_LOCK_ASSERT_HELD(sc); TAILQ_FOREACH(bif, &sc->sc_iflist, bif_next) { if (bif->bif_ifp == member_ifp) { return bif; } } return NULL; } static inline bool get_and_clear_promisc(mbuf_t m) { bool is_promisc; /* * Need to clear the promiscuous flag otherwise the packet will be * dropped by DLIL after processing filters */ is_promisc = (mbuf_flags(m) & MBUF_PROMISC) != 0; if (is_promisc) { mbuf_setflags_mask(m, 0, MBUF_PROMISC); } return is_promisc; } static errno_t bridge_iff_input(void *cookie, ifnet_t ifp, protocol_family_t protocol, mbuf_t *data, char **frame_ptr) { #pragma unused(protocol) errno_t error = 0; struct bridge_iflist *bif = (struct bridge_iflist *)cookie; struct bridge_softc *sc = bif->bif_sc; int included = 0; struct ether_header * eh_p; size_t frmlen = 0; bool is_promisc; mblist list; mbuf_t m = *data; uint32_t sc_filter_flags; if ((m->m_flags & M_PROTO1)) { goto out; } if (*frame_ptr >= (char *)mbuf_datastart(m) && *frame_ptr <= mtod(m, char *)) { included = 1; frmlen = mtod(m, char *) - *frame_ptr; } BRIDGE_LOG(LOG_DEBUG, BR_DBGF_INPUT, "%s from %s m 0x%llx data 0x%llx frame 0x%llx %s " "frmlen %lu", sc->sc_ifp->if_xname, ifp->if_xname, (uint64_t)VM_KERNEL_ADDRPERM(m), (uint64_t)VM_KERNEL_ADDRPERM(mtod(m, void *)), (uint64_t)VM_KERNEL_ADDRPERM(*frame_ptr), included ? "inside" : "outside", frmlen); if (BRIDGE_DBGF_ENABLED(BR_DBGF_MBUF)) { brlog_mbuf(m, "bridge_iff_input[", ""); brlog_ether_header((struct ether_header *) (void *)*frame_ptr); brlog_mbuf_data(m, 0, 20); } if (included == 0) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_INPUT, "frame_ptr outside mbuf"); goto out; } /* Move data pointer to start of frame to the link layer header */ _mbuf_adjust_pkthdr_and_data(m, -frmlen); /* make sure we can access the ethernet header */ if (mbuf_pkthdr_len(m) < sizeof(struct ether_header)) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_INPUT, "short frame %lu < %lu", mbuf_pkthdr_len(m), sizeof(struct ether_header)); goto out; } if (mbuf_len(m) < sizeof(struct ether_header)) { error = mbuf_pullup(data, sizeof(struct ether_header)); if (error != 0) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_INPUT, "mbuf_pullup(%lu) failed %d", sizeof(struct ether_header), error); error = EJUSTRETURN; goto out; } if (m != *data) { m = *data; *frame_ptr = mtod(m, char *); } } sc_filter_flags = sc->sc_filter_flags; if ((sc_filter_flags & IFBF_FILT_MEMBER) != 0 && PF_IS_ENABLED) { error = bridge_pf(data, ifp, sc_filter_flags, true); m = *data; if (error != 0 || m == NULL) { return EJUSTRETURN; } } mblist_init(&list); mblist_append(&list, m); is_promisc = get_and_clear_promisc(m); eh_p = __unsafe_forge_single(struct ether_header *, *frame_ptr); list = bridge_input_list(sc, ifp, eh_p, list, is_promisc); m = *data = list.head; if (m == NULL) { error = EJUSTRETURN; } if (BRIDGE_DBGF_ENABLED(BR_DBGF_MBUF) && BRIDGE_DBGF_ENABLED(BR_DBGF_INPUT)) { brlog_mbuf(m, "bridge_iff_input]", ""); } out: BRIDGE_LOCK_ASSERT_NOTHELD(sc); return error; } static errno_t bridge_iff_output(void *cookie, ifnet_t ifp, protocol_family_t protocol, mbuf_t *data) { #pragma unused(protocol) errno_t error = 0; struct bridge_iflist *bif = (struct bridge_iflist *)cookie; struct bridge_softc *sc = bif->bif_sc; mbuf_t m = *data; if ((m->m_flags & M_PROTO1)) { goto out; } BRIDGE_LOG(LOG_DEBUG, BR_DBGF_OUTPUT, "%s from %s m 0x%llx data 0x%llx", sc->sc_ifp->if_xname, ifp->if_xname, (uint64_t)VM_KERNEL_ADDRPERM(m), (uint64_t)VM_KERNEL_ADDRPERM(mtod(m, void *))); error = bridge_member_output(sc, ifp, data); if (error != 0 && error != EJUSTRETURN) { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_OUTPUT, "bridge_member_output failed error %d", error); } out: BRIDGE_LOCK_ASSERT_NOTHELD(sc); return error; } static void bridge_iff_event(void *cookie, ifnet_t ifp, protocol_family_t protocol, const struct kev_msg *event_msg) { #pragma unused(protocol) struct bridge_iflist *bif = (struct bridge_iflist *)cookie; struct bridge_softc *sc = bif->bif_sc; if (event_msg->vendor_code == KEV_VENDOR_APPLE && event_msg->kev_class == KEV_NETWORK_CLASS && event_msg->kev_subclass == KEV_DL_SUBCLASS) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_LIFECYCLE, "%s event_code %u - %s", ifp->if_xname, event_msg->event_code, dlil_kev_dl_code_str(event_msg->event_code)); switch (event_msg->event_code) { case KEV_DL_LINK_OFF: case KEV_DL_LINK_ON: { bridge_iflinkevent(ifp); #if BRIDGESTP bstp_linkstate(ifp, event_msg->event_code); #endif /* BRIDGESTP */ break; } case KEV_DL_SIFFLAGS: { if ((ifp->if_flags & IFF_UP) == 0) { break; } if ((bif->bif_flags & BIFF_PROMISC) == 0) { errno_t error; error = ifnet_set_promiscuous(ifp, 1); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, 0, "ifnet_set_promiscuous (%s)" " failed %d", ifp->if_xname, error); } else { bif->bif_flags |= BIFF_PROMISC; } } if ((bif->bif_flags & BIFF_WIFI_INFRA) != 0 && (bif->bif_flags & BIFF_ALL_MULTI) == 0) { errno_t error; error = if_allmulti(ifp, 1); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, 0, "if_allmulti (%s)" " failed %d", ifp->if_xname, error); } else { bif->bif_flags |= BIFF_ALL_MULTI; #ifdef XNU_PLATFORM_AppleTVOS ip6_forwarding = 1; #endif /* XNU_PLATFORM_AppleTVOS */ } } break; } case KEV_DL_IFCAP_CHANGED: { BRIDGE_LOCK(sc); bridge_set_tso(sc); BRIDGE_UNLOCK(sc); break; } case KEV_DL_PROTO_DETACHED: case KEV_DL_PROTO_ATTACHED: { bridge_proto_attach_changed(ifp); break; } default: break; } } } /* * bridge_iff_detached: * * Called when our interface filter has been detached from a * member interface. */ static void bridge_iff_detached(void *cookie, ifnet_t ifp) { #pragma unused(cookie) struct bridge_iflist *bif; struct bridge_softc * __single sc = ifp->if_bridge; BRIDGE_LOG(LOG_DEBUG, BR_DBGF_LIFECYCLE, "%s", ifp->if_xname); /* Check if the interface is a bridge member */ if (sc != NULL) { BRIDGE_LOCK(sc); bif = bridge_lookup_member_if(sc, ifp); if (bif != NULL) { bridge_delete_member(sc, bif); } BRIDGE_UNLOCK(sc); return; } /* Check if the interface is a span port */ lck_mtx_lock(&bridge_list_mtx); LIST_FOREACH(sc, &bridge_list, sc_list) { BRIDGE_LOCK(sc); TAILQ_FOREACH(bif, &sc->sc_spanlist, bif_next) if (ifp == bif->bif_ifp) { bridge_delete_span(sc, bif); break; } BRIDGE_UNLOCK(sc); } lck_mtx_unlock(&bridge_list_mtx); } static errno_t bridge_proto_input(ifnet_t ifp, protocol_family_t protocol, mbuf_t packet, char *header) { #pragma unused(protocol, packet, header) BRIDGE_LOG(LOG_NOTICE, 0, "%s unexpected packet", ifp->if_xname); return 0; } static int bridge_attach_protocol(struct ifnet *ifp) { int error; struct ifnet_attach_proto_param reg; BRIDGE_LOG(LOG_DEBUG, BR_DBGF_LIFECYCLE, "%s", ifp->if_xname); bzero(®, sizeof(reg)); reg.input = bridge_proto_input; error = ifnet_attach_protocol(ifp, PF_BRIDGE, ®); if (error) { BRIDGE_LOG(LOG_NOTICE, 0, "ifnet_attach_protocol(%s) failed, %d", ifp->if_xname, error); } return error; } static int bridge_detach_protocol(struct ifnet *ifp) { int error; BRIDGE_LOG(LOG_DEBUG, BR_DBGF_LIFECYCLE, "%s", ifp->if_xname); error = ifnet_detach_protocol(ifp, PF_BRIDGE); if (error) { BRIDGE_LOG(LOG_NOTICE, 0, "ifnet_detach_protocol(%s) failed, %d", ifp->if_xname, error); } return error; } /* * bridge_delete_member: * * Delete the specified member interface. */ static void bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) { #if SKYWALK boolean_t add_netagent = FALSE; #endif /* SKYWALK */ uint32_t bif_flags; struct ifnet *ifs = bif->bif_ifp, *bifp = sc->sc_ifp; int lladdr_changed = 0, error; uint8_t eaddr[ETHER_ADDR_LEN]; u_int32_t event_code = 0; BRIDGE_LOCK_ASSERT_HELD(sc); VERIFY(ifs != NULL); /* * Remove the member from the list first so it cannot be found anymore * when we release the bridge lock below */ if ((bif->bif_flags & BIFF_IN_MEMBER_LIST) != 0) { bif->bif_flags &= ~BIFF_IN_MEMBER_LIST; BRIDGE_XLOCK(sc); TAILQ_REMOVE(&sc->sc_iflist, bif, bif_next); BRIDGE_XDROP(sc); } if (sc->sc_mac_nat_bif != NULL) { if (bif == sc->sc_mac_nat_bif) { bridge_mac_nat_disable(sc); } else { bridge_mac_nat_flush_entries(sc, bif); } } #if BRIDGESTP if ((bif->bif_ifflags & IFBIF_STP) != 0) { bstp_disable(&bif->bif_stp); } #endif /* BRIDGESTP */ /* * If removing the interface that gave the bridge its mac address, set * the mac address of the bridge to the address of the next member, or * to its default address if no members are left. */ if (bridge_inherit_mac && sc->sc_ifaddr == ifs) { ifnet_release(sc->sc_ifaddr); if (TAILQ_EMPTY(&sc->sc_iflist)) { bcopy(sc->sc_defaddr, eaddr, ETHER_ADDR_LEN); sc->sc_ifaddr = NULL; } else { struct ifnet *fif = TAILQ_FIRST(&sc->sc_iflist)->bif_ifp; bcopy(IF_LLADDR(fif), eaddr, ETHER_ADDR_LEN); sc->sc_ifaddr = fif; ifnet_reference(fif); /* for sc_ifaddr */ } lladdr_changed = 1; } #if HAS_IF_CAP bridge_mutecaps(sc); /* recalculate now this interface is removed */ #endif /* HAS_IF_CAP */ error = bridge_set_tso(sc); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, 0, "bridge_set_tso failed %d", error); } bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); KASSERT(bif->bif_addrcnt == 0, ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); /* * Update link status of the bridge based on its remaining members */ event_code = bridge_updatelinkstatus(sc); bif_flags = bif->bif_flags; BRIDGE_UNLOCK(sc); /* only perform these steps if the interface is still attached */ if (ifnet_get_ioref(ifs)) { #if SKYWALK add_netagent = (bif_flags & BIFF_NETAGENT_REMOVED) != 0; if ((bif_flags & BIFF_FLOWSWITCH_ATTACHED) != 0) { ifnet_detach_flowswitch_nexus(ifs); } #endif /* SKYWALK */ /* disable promiscuous mode */ if ((bif_flags & BIFF_PROMISC) != 0) { (void) ifnet_set_promiscuous(ifs, 0); } /* disable all multi */ if ((bif_flags & BIFF_ALL_MULTI) != 0) { (void)if_allmulti(ifs, 0); } #if HAS_IF_CAP /* re-enable any interface capabilities */ bridge_set_ifcap(sc, bif, bif->bif_savedcaps); #endif /* detach bridge "protocol" */ if ((bif_flags & BIFF_PROTO_ATTACHED) != 0) { (void)bridge_detach_protocol(ifs); } /* detach interface filter */ if ((bif_flags & BIFF_FILTER_ATTACHED) != 0) { iflt_detach(bif->bif_iff_ref); } /* re-enable LRO */ if ((bif_flags & BIFF_LRO_DISABLED) != 0) { (void)bridge_set_lro(ifs, TRUE); } ifnet_decr_iorefcnt(ifs); } if (lladdr_changed && (error = ifnet_set_lladdr(bifp, eaddr, ETHER_ADDR_LEN)) != 0) { BRIDGE_LOG(LOG_NOTICE, 0, "ifnet_set_lladdr failed %d", error); } if (event_code != 0) { bridge_link_event(bifp, event_code); } #if BRIDGESTP bstp_destroy(&bif->bif_stp); /* prepare to free */ #endif /* BRIDGESTP */ kfree_type(struct bridge_iflist, bif); ifs->if_bridge = NULL; #if SKYWALK if (add_netagent && ifnet_get_ioref(ifs)) { (void)ifnet_add_netagent(ifs); ifnet_decr_iorefcnt(ifs); } #endif /* SKYWALK */ ifnet_release(ifs); BRIDGE_LOCK(sc); } /* * bridge_delete_span: * * Delete the specified span interface. */ static void bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) { BRIDGE_LOCK_ASSERT_HELD(sc); KASSERT(bif->bif_ifp->if_bridge == NULL, ("%s: not a span interface", __func__)); ifnet_release(bif->bif_ifp); TAILQ_REMOVE(&sc->sc_spanlist, bif, bif_next); kfree_type(struct bridge_iflist, bif); } static int bridge_ioctl_add(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbreq * __single req = arg; struct bridge_iflist *bif = NULL; struct ifnet *ifs, *bifp = sc->sc_ifp; int error = 0, lladdr_changed = 0; uint8_t eaddr[ETHER_ADDR_LEN]; struct iff_filter iff; u_int32_t event_code = 0; boolean_t input_broadcast; int media_active; boolean_t wifi_infra = FALSE; ifs = ifunit(sanitize_ifname(req->ifbr_ifsname)); if (ifs == NULL) { return ENOENT; } if (ifs->if_ioctl == NULL) { /* must be supported */ return EINVAL; } if (IFNET_IS_INTCOPROC(ifs) || IFNET_IS_MANAGEMENT(ifs)) { return EINVAL; } /* If it's in the span list, it can't be a member. */ TAILQ_FOREACH(bif, &sc->sc_spanlist, bif_next) { if (ifs == bif->bif_ifp) { return EBUSY; } } if (ifs->if_bridge == sc) { return EEXIST; } if (ifs->if_bridge != NULL) { return EBUSY; } switch (ifs->if_type) { case IFT_ETHER: if (strcmp(ifs->if_name, "en") == 0 && ifs->if_subfamily == IFNET_SUBFAMILY_WIFI && (ifs->if_eflags & IFEF_IPV4_ROUTER) == 0) { /* XXX is there a better way to identify Wi-Fi STA? */ wifi_infra = TRUE; } break; case IFT_L2VLAN: case IFT_IEEE8023ADLAG: break; default: return EINVAL; } /* fail to add the interface if the MTU doesn't match */ if (!TAILQ_EMPTY(&sc->sc_iflist) && sc->sc_ifp->if_mtu != ifs->if_mtu) { BRIDGE_LOG(LOG_NOTICE, 0, "%s invalid MTU for %s", sc->sc_ifp->if_xname, ifs->if_xname); return EINVAL; } if (wifi_infra && sc->sc_mac_nat_bif != NULL) { /* there's already an interface that's doing MAC NAT */ return EBUSY; } /* prevent the interface from detaching while we add the member */ if (!ifnet_get_ioref(ifs)) { return ENXIO; } /* allocate a new member */ bif = kalloc_type(struct bridge_iflist, Z_WAITOK | Z_ZERO | Z_NOFAIL); bif->bif_ifp = ifs; ifnet_reference(ifs); bif->bif_ifflags |= IFBIF_LEARNING | IFBIF_DISCOVER; #if HAS_IF_CAP bif->bif_savedcaps = ifs->if_capenable; #endif /* HAS_IF_CAP */ bif->bif_sc = sc; if (wifi_infra) { (void)bridge_mac_nat_enable(sc, bif); } /* Allow the first Ethernet member to define the MTU */ if (TAILQ_EMPTY(&sc->sc_iflist)) { sc->sc_ifp->if_mtu = ifs->if_mtu; } /* * Assign the interface's MAC address to the bridge if it's the first * member and the MAC address of the bridge has not been changed from * the default (randomly) generated one. */ if (bridge_inherit_mac && TAILQ_EMPTY(&sc->sc_iflist) && _ether_cmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr) == 0) { bcopy(IF_LLADDR(ifs), eaddr, ETHER_ADDR_LEN); sc->sc_ifaddr = ifs; ifnet_reference(ifs); /* for sc_ifaddr */ lladdr_changed = 1; } ifs->if_bridge = sc; #if BRIDGESTP bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); #endif /* BRIDGESTP */ #if HAS_IF_CAP /* Set interface capabilities to the intersection set of all members */ bridge_mutecaps(sc); #endif /* HAS_IF_CAP */ /* * Respect lock ordering with DLIL lock for the following operations */ BRIDGE_UNLOCK(sc); /* enable promiscuous mode */ error = ifnet_set_promiscuous(ifs, 1); switch (error) { case 0: bif->bif_flags |= BIFF_PROMISC; break; case ENETDOWN: case EPWROFF: BRIDGE_LOG(LOG_NOTICE, 0, "ifnet_set_promiscuous(%s) failed %d, ignoring", ifs->if_xname, error); /* Ignore error when device is not up */ error = 0; break; default: BRIDGE_LOG(LOG_NOTICE, 0, "ifnet_set_promiscuous(%s) failed %d", ifs->if_xname, error); BRIDGE_LOCK(sc); goto out; } if (wifi_infra) { int this_error; /* Wi-Fi doesn't really support promiscuous, set allmulti */ bif->bif_flags |= BIFF_WIFI_INFRA; this_error = if_allmulti(ifs, 1); if (this_error == 0) { bif->bif_flags |= BIFF_ALL_MULTI; #ifdef XNU_PLATFORM_AppleTVOS ip6_forwarding = 1; #endif /* XNU_PLATFORM_AppleTVOS */ } else { BRIDGE_LOG(LOG_NOTICE, 0, "if_allmulti(%s) failed %d, ignoring", ifs->if_xname, this_error); } } #if SKYWALK /* ensure that the flowswitch is present for native interface */ if (SKYWALK_NATIVE(ifs)) { if (ifnet_attach_flowswitch_nexus(ifs)) { bif->bif_flags |= BIFF_FLOWSWITCH_ATTACHED; } } /* remove the netagent on the flowswitch (rdar://75050182) */ if (if_is_fsw_netagent_enabled()) { (void)ifnet_remove_netagent(ifs); bif->bif_flags |= BIFF_NETAGENT_REMOVED; } #endif /* SKYWALK */ /* * install an interface filter */ memset(&iff, 0, sizeof(struct iff_filter)); iff.iff_cookie = bif; iff.iff_name = "com.apple.kernel.bsd.net.if_bridge"; iff.iff_input = bridge_iff_input; iff.iff_output = bridge_iff_output; iff.iff_event = bridge_iff_event; iff.iff_detached = bridge_iff_detached; error = dlil_attach_filter(ifs, &iff, &bif->bif_iff_ref, DLIL_IFF_TSO | DLIL_IFF_INTERNAL | DLIL_IFF_BRIDGE); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, 0, "iflt_attach failed %d", error); BRIDGE_LOCK(sc); goto out; } bif->bif_flags |= BIFF_FILTER_ATTACHED; /* * install a dummy "bridge" protocol */ if ((error = bridge_attach_protocol(ifs)) != 0) { if (error != 0) { BRIDGE_LOG(LOG_NOTICE, 0, "bridge_attach_protocol failed %d", error); BRIDGE_LOCK(sc); goto out; } } bif->bif_flags |= BIFF_PROTO_ATTACHED; if (lladdr_changed && (error = ifnet_set_lladdr(bifp, eaddr, ETHER_ADDR_LEN)) != 0) { BRIDGE_LOG(LOG_NOTICE, 0, "ifnet_set_lladdr failed %d", error); } media_active = interface_media_active(ifs); /* disable LRO if needed */ if (bridge_set_lro(ifs, FALSE)) { bif->bif_flags |= BIFF_LRO_DISABLED; } /* * No failures past this point. Add the member to the list. */ BRIDGE_LOCK(sc); bif->bif_flags |= BIFF_IN_MEMBER_LIST; BRIDGE_XLOCK(sc); TAILQ_INSERT_TAIL(&sc->sc_iflist, bif, bif_next); BRIDGE_XDROP(sc); /* cache the member link status */ if (media_active != 0) { bif->bif_flags |= BIFF_MEDIA_ACTIVE; } else { bif->bif_flags &= ~BIFF_MEDIA_ACTIVE; } /* the new member may change the link status of the bridge interface */ event_code = bridge_updatelinkstatus(sc); /* check whether we need input broadcast or not */ input_broadcast = interface_needs_input_broadcast(ifs); bif_set_input_broadcast(bif, input_broadcast); BRIDGE_UNLOCK(sc); if (event_code != 0) { bridge_link_event(bifp, event_code); } BRIDGE_LOG(LOG_DEBUG, BR_DBGF_LIFECYCLE, "%s input broadcast %s", ifs->if_xname, input_broadcast ? "ENABLED" : "DISABLED"); BRIDGE_LOCK(sc); bridge_set_tso(sc); out: /* allow the interface to detach */ ifnet_decr_iorefcnt(ifs); if (error != 0) { if (bif != NULL) { bridge_delete_member(sc, bif); } } else if (IFNET_IS_VMNET(ifs)) { INC_ATOMIC_INT64_LIM(net_api_stats.nas_vmnet_total); } return error; } static int bridge_ioctl_del(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbreq * __single req = arg; struct bridge_iflist *bif; bif = bridge_lookup_member(sc, req->ifbr_ifsname); if (bif == NULL) { return ENOENT; } bridge_delete_member(sc, bif); return 0; } static int bridge_ioctl_purge(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { #pragma unused(sc, arg, arg_len) return 0; } static int bridge_ioctl_gifflags(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbreq * __single req = arg; struct bridge_iflist *bif; bif = bridge_lookup_member(sc, req->ifbr_ifsname); if (bif == NULL) { return ENOENT; } struct bstp_port *bp; bp = &bif->bif_stp; req->ifbr_state = bp->bp_state; req->ifbr_priority = bp->bp_priority; req->ifbr_path_cost = bp->bp_path_cost; req->ifbr_proto = bp->bp_protover; req->ifbr_role = bp->bp_role; req->ifbr_stpflags = bp->bp_flags; req->ifbr_ifsflags = bif->bif_ifflags; /* Copy STP state options as flags */ if (bp->bp_operedge) { req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; } if (bp->bp_flags & BSTP_PORT_AUTOEDGE) { req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; } if (bp->bp_ptp_link) { req->ifbr_ifsflags |= IFBIF_BSTP_PTP; } if (bp->bp_flags & BSTP_PORT_AUTOPTP) { req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; } if (bp->bp_flags & BSTP_PORT_ADMEDGE) { req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; } if (bp->bp_flags & BSTP_PORT_ADMCOST) { req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; } req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; req->ifbr_addrcnt = bif->bif_addrcnt; req->ifbr_addrmax = bif->bif_addrmax; req->ifbr_addrexceeded = bif->bif_addrexceeded; return 0; } static int bridge_ioctl_sifflags(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbreq * __single req = arg; struct bridge_iflist *bif; #if BRIDGESTP struct bstp_port *bp; #endif /* BRIDGESTP */ errno_t error; uint32_t ifsflags; bif = bridge_lookup_member(sc, req->ifbr_ifsname); if (bif == NULL) { return ENOENT; } ifsflags = req->ifbr_ifsflags; if (ifsflags & IFBIF_SPAN) { /* SPAN is readonly */ return EINVAL; } #define CHECKSUM_VIRTIO (IFBIF_CHECKSUM_OFFLOAD | IFBIF_USES_VIRTIO) if ((ifsflags & CHECKSUM_VIRTIO) == CHECKSUM_VIRTIO) { /* can't specify checksum and virtio */ return EINVAL; } if ((ifsflags & IFBIF_MAC_NAT) != 0 && ((ifsflags & CHECKSUM_VIRTIO) != 0 || (bif->bif_flags & BIFF_HOST_FILTER) != 0)) { /* MAC-NAT can't be used with checksum, host filter, or virtio */ return EINVAL; } if ((ifsflags & IFBIF_MAC_NAT) != 0) { error = bridge_mac_nat_enable(sc, bif); if (error != 0) { return error; } } else if (sc->sc_mac_nat_bif == bif) { bridge_mac_nat_disable(sc); } #if BRIDGESTP if (ifsflags & IFBIF_STP) { if ((bif->bif_ifflags & IFBIF_STP) == 0) { error = bstp_enable(&bif->bif_stp); if (error) { return error; } } } else { if ((bif->bif_ifflags & IFBIF_STP) != 0) { bstp_disable(&bif->bif_stp); } } /* Pass on STP flags */ bp = &bif->bif_stp; bstp_set_edge(bp, ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); bstp_set_autoedge(bp, ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); bstp_set_ptp(bp, ifsflags & IFBIF_BSTP_PTP ? 1 : 0); bstp_set_autoptp(bp, ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); #else /* !BRIDGESTP */ if (ifsflags & IFBIF_STP) { return EOPNOTSUPP; } #endif /* !BRIDGESTP */ /* Save the bits relating to the bridge */ bif->bif_ifflags = ifsflags & IFBIFMASK; return 0; } static int bridge_ioctl_scache(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbrparam * __single param = arg; sc->sc_brtmax = param->ifbrp_csize; bridge_rttrim(sc); return 0; } static int bridge_ioctl_gcache(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbrparam * __single param = arg; param->ifbrp_csize = sc->sc_brtmax; return 0; } #define BRIDGE_IOCTL_GIFS do { \ struct bridge_iflist *bif; \ struct ifbreq breq; \ char *buf, *outbuf; \ unsigned int count, buflen, len; \ \ count = 0; \ TAILQ_FOREACH(bif, &sc->sc_iflist, bif_next) \ count++; \ TAILQ_FOREACH(bif, &sc->sc_spanlist, bif_next) \ count++; \ \ buflen = sizeof (breq) * count; \ if (bifc->ifbic_len == 0) { \ bifc->ifbic_len = buflen; \ return (0); \ } \ BRIDGE_UNLOCK(sc); \ outbuf = kalloc_data(buflen, Z_WAITOK | Z_ZERO); \ BRIDGE_LOCK(sc); \ \ count = 0; \ buf = outbuf; \ len = min(bifc->ifbic_len, buflen); \ bzero(&breq, sizeof (breq)); \ TAILQ_FOREACH(bif, &sc->sc_iflist, bif_next) { \ if (len < sizeof (breq)) \ break; \ \ snprintf(breq.ifbr_ifsname, sizeof (breq.ifbr_ifsname), \ "%s", bif->bif_ifp->if_xname); \ /* Fill in the ifbreq structure */ \ error = bridge_ioctl_gifflags(sc, &breq, sizeof(breq)); \ if (error) \ break; \ memcpy(buf, &breq, sizeof (breq)); \ count++; \ buf += sizeof (breq); \ len -= sizeof (breq); \ } \ TAILQ_FOREACH(bif, &sc->sc_spanlist, bif_next) { \ if (len < sizeof (breq)) \ break; \ \ snprintf(breq.ifbr_ifsname, \ sizeof (breq.ifbr_ifsname), \ "%s", bif->bif_ifp->if_xname); \ breq.ifbr_ifsflags = bif->bif_ifflags; \ breq.ifbr_portno \ = bif->bif_ifp->if_index & 0xfff; \ memcpy(buf, &breq, sizeof (breq)); \ count++; \ buf += sizeof (breq); \ len -= sizeof (breq); \ } \ \ BRIDGE_UNLOCK(sc); \ bifc->ifbic_len = sizeof (breq) * count; \ if (bifc->ifbic_len > 0) { \ error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);\ } \ BRIDGE_LOCK(sc); \ kfree_data(outbuf, buflen); \ } while (0) static int bridge_ioctl_gifs64(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbifconf64 * __single bifc = arg; int error = 0; BRIDGE_IOCTL_GIFS; return error; } static int bridge_ioctl_gifs32(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbifconf32 * __single bifc = arg; int error = 0; BRIDGE_IOCTL_GIFS; return error; } #define BRIDGE_IOCTL_RTS do { \ struct bridge_rtnode *brt; \ char *buf; \ char *outbuf = NULL; \ unsigned int count, buflen, len; \ unsigned long now; \ \ if (bac->ifbac_len == 0) \ return (0); \ \ bzero(&bareq, sizeof (bareq)); \ count = 0; \ LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) \ count++; \ buflen = sizeof (bareq) * count; \ \ BRIDGE_UNLOCK(sc); \ outbuf = kalloc_data(buflen, Z_WAITOK | Z_ZERO); \ BRIDGE_LOCK(sc); \ \ count = 0; \ buf = outbuf; \ len = min(bac->ifbac_len, buflen); \ LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { \ if (len < sizeof (bareq)) \ goto out; \ snprintf(bareq.ifba_ifsname, sizeof (bareq.ifba_ifsname), \ "%s", brt->brt_ifp->if_xname); \ memcpy(bareq.ifba_dst, brt->brt_addr, sizeof (brt->brt_addr)); \ bareq.ifba_vlan = brt->brt_vlan; \ if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { \ now = (unsigned long) net_uptime(); \ if (now < brt->brt_expire) \ bareq.ifba_expire = \ brt->brt_expire - now; \ } else \ bareq.ifba_expire = 0; \ bareq.ifba_flags = brt->brt_flags; \ \ memcpy(buf, &bareq, sizeof (bareq)); \ count++; \ buf += sizeof (bareq); \ len -= sizeof (bareq); \ } \ out: \ bac->ifbac_len = sizeof (bareq) * count; \ if (outbuf != NULL) { \ BRIDGE_UNLOCK(sc); \ if (bac->ifbac_len > 0) { \ error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);\ } \ kfree_data(outbuf, buflen); \ BRIDGE_LOCK(sc); \ } \ return (error); \ } while (0) static int bridge_ioctl_rts64(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbaconf64 * __single bac = arg; struct ifbareq64 bareq; int error = 0; BRIDGE_IOCTL_RTS; return error; } static int bridge_ioctl_rts32(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbaconf32 * __single bac = arg; struct ifbareq32 bareq; int error = 0; BRIDGE_IOCTL_RTS; return error; } static int bridge_ioctl_saddr32(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbareq32 * __single req = arg; struct bridge_iflist *bif; int error; bif = bridge_lookup_member(sc, req->ifba_ifsname); if (bif == NULL) { return ENOENT; } error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, req->ifba_flags); return error; } static int bridge_ioctl_saddr64(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbareq64 * __single req = arg; struct bridge_iflist *bif; int error; bif = bridge_lookup_member(sc, req->ifba_ifsname); if (bif == NULL) { return ENOENT; } error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, req->ifba_flags); return error; } static int bridge_ioctl_sto(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbrparam * __single param = arg; sc->sc_brttimeout = param->ifbrp_ctime; return 0; } static int bridge_ioctl_gto(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbrparam * __single param = arg; param->ifbrp_ctime = sc->sc_brttimeout; return 0; } static int bridge_ioctl_daddr32(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbareq32 * __single req = arg; return bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan); } static int bridge_ioctl_daddr64(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbareq64 * __single req = arg; return bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan); } static int bridge_ioctl_flush(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbreq * __single req = arg; bridge_rtflush(sc, req->ifbr_ifsflags); return 0; } static int bridge_ioctl_gpri(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbrparam * __single param = arg; struct bstp_state *bs = &sc->sc_stp; param->ifbrp_prio = bs->bs_bridge_priority; return 0; } static int bridge_ioctl_spri(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { #if BRIDGESTP struct ifbrparam *param = arg; return bstp_set_priority(&sc->sc_stp, param->ifbrp_prio); #else /* !BRIDGESTP */ #pragma unused(sc, arg) return EOPNOTSUPP; #endif /* !BRIDGESTP */ } static int bridge_ioctl_ght(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbrparam * __single param = arg; struct bstp_state *bs = &sc->sc_stp; param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; return 0; } static int bridge_ioctl_sht(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { #if BRIDGESTP struct ifbrparam *param = arg; return bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime); #else /* !BRIDGESTP */ #pragma unused(sc, arg) return EOPNOTSUPP; #endif /* !BRIDGESTP */ } static int bridge_ioctl_gfd(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbrparam * __single param; struct bstp_state *bs; param = arg; bs = &sc->sc_stp; param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; return 0; } static int bridge_ioctl_sfd(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { #if BRIDGESTP struct ifbrparam *param = arg; return bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay); #else /* !BRIDGESTP */ #pragma unused(sc, arg) return EOPNOTSUPP; #endif /* !BRIDGESTP */ } static int bridge_ioctl_gma(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbrparam * __single param; struct bstp_state *bs; param = arg; bs = &sc->sc_stp; param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; return 0; } static int bridge_ioctl_sma(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { #if BRIDGESTP struct ifbrparam *param = arg; return bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage); #else /* !BRIDGESTP */ #pragma unused(sc, arg) return EOPNOTSUPP; #endif /* !BRIDGESTP */ } static int bridge_ioctl_sifprio(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { #if BRIDGESTP struct ifbreq *req = arg; struct bridge_iflist *bif; bif = bridge_lookup_member(sc, req->ifbr_ifsname); if (bif == NULL) { return ENOENT; } return bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority); #else /* !BRIDGESTP */ #pragma unused(sc, arg) return EOPNOTSUPP; #endif /* !BRIDGESTP */ } static int bridge_ioctl_sifcost(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { #if BRIDGESTP struct ifbreq *req = arg; struct bridge_iflist *bif; bif = bridge_lookup_member(sc, req->ifbr_ifsname); if (bif == NULL) { return ENOENT; } return bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost); #else /* !BRIDGESTP */ #pragma unused(sc, arg) return EOPNOTSUPP; #endif /* !BRIDGESTP */ } static int bridge_ioctl_gfilt(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbrparam * __single param = arg; param->ifbrp_filter = sc->sc_filter_flags; return 0; } static int bridge_ioctl_sfilt(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbrparam * __single param = arg; if (param->ifbrp_filter & ~IFBF_FILT_MASK) { return EINVAL; } if (param->ifbrp_filter & IFBF_FILT_USEIPF) { return EINVAL; } sc->sc_filter_flags = param->ifbrp_filter; return 0; } static int bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbreq * __single req = arg; struct bridge_iflist *bif; bif = bridge_lookup_member(sc, req->ifbr_ifsname); if (bif == NULL) { return ENOENT; } bif->bif_addrmax = req->ifbr_addrmax; return 0; } static int bridge_ioctl_addspan(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbreq * __single req = arg; struct bridge_iflist *bif = NULL; struct ifnet *ifs; ifs = ifunit(sanitize_ifname(req->ifbr_ifsname)); if (ifs == NULL) { return ENOENT; } if (IFNET_IS_INTCOPROC(ifs) || IFNET_IS_MANAGEMENT(ifs)) { return EINVAL; } TAILQ_FOREACH(bif, &sc->sc_spanlist, bif_next) if (ifs == bif->bif_ifp) { return EBUSY; } if (ifs->if_bridge != NULL) { return EBUSY; } switch (ifs->if_type) { case IFT_ETHER: case IFT_L2VLAN: case IFT_IEEE8023ADLAG: break; default: return EINVAL; } bif = kalloc_type(struct bridge_iflist, Z_WAITOK | Z_ZERO | Z_NOFAIL); bif->bif_ifp = ifs; bif->bif_ifflags = IFBIF_SPAN; ifnet_reference(bif->bif_ifp); TAILQ_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); return 0; } static int bridge_ioctl_delspan(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbreq * __single req = arg; struct bridge_iflist *bif; struct ifnet *ifs; ifs = ifunit(sanitize_ifname(req->ifbr_ifsname)); if (ifs == NULL) { return ENOENT; } TAILQ_FOREACH(bif, &sc->sc_spanlist, bif_next) if (ifs == bif->bif_ifp) { break; } if (bif == NULL) { return ENOENT; } bridge_delete_span(sc, bif); return 0; } #define BRIDGE_IOCTL_GBPARAM do { \ struct bstp_state *bs = &sc->sc_stp; \ struct bstp_port *root_port; \ \ req->ifbop_maxage = bs->bs_bridge_max_age >> 8; \ req->ifbop_hellotime = bs->bs_bridge_htime >> 8; \ req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; \ \ root_port = bs->bs_root_port; \ if (root_port == NULL) \ req->ifbop_root_port = 0; \ else \ req->ifbop_root_port = root_port->bp_ifp->if_index; \ \ req->ifbop_holdcount = bs->bs_txholdcount; \ req->ifbop_priority = bs->bs_bridge_priority; \ req->ifbop_protocol = bs->bs_protover; \ req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; \ req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; \ req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; \ req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; \ req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; \ req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; \ } while (0) static int bridge_ioctl_gbparam32(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbropreq32 * __single req = arg; BRIDGE_IOCTL_GBPARAM; return 0; } static int bridge_ioctl_gbparam64(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbropreq64 * __single req = arg; BRIDGE_IOCTL_GBPARAM; return 0; } static int bridge_ioctl_grte(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbrparam * __single param = arg; param->ifbrp_cexceeded = sc->sc_brtexceeded; return 0; } #define BRIDGE_IOCTL_GIFSSTP do { \ struct bridge_iflist *bif; \ struct bstp_port *bp; \ struct ifbpstpreq bpreq; \ char *buf, *outbuf; \ unsigned int count, buflen, len; \ \ count = 0; \ TAILQ_FOREACH(bif, &sc->sc_iflist, bif_next) { \ if ((bif->bif_ifflags & IFBIF_STP) != 0) \ count++; \ } \ \ buflen = sizeof (bpreq) * count; \ if (bifstp->ifbpstp_len == 0) { \ bifstp->ifbpstp_len = buflen; \ return (0); \ } \ \ BRIDGE_UNLOCK(sc); \ outbuf = kalloc_data(buflen, Z_WAITOK | Z_ZERO); \ BRIDGE_LOCK(sc); \ \ count = 0; \ buf = outbuf; \ len = min(bifstp->ifbpstp_len, buflen); \ bzero(&bpreq, sizeof (bpreq)); \ TAILQ_FOREACH(bif, &sc->sc_iflist, bif_next) { \ if (len < sizeof (bpreq)) \ break; \ \ if ((bif->bif_ifflags & IFBIF_STP) == 0) \ continue; \ \ bp = &bif->bif_stp; \ bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; \ bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; \ bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; \ bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; \ bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; \ bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; \ \ memcpy(buf, &bpreq, sizeof (bpreq)); \ count++; \ buf += sizeof (bpreq); \ len -= sizeof (bpreq); \ } \ \ BRIDGE_UNLOCK(sc); \ bifstp->ifbpstp_len = sizeof (bpreq) * count; \ if (bifstp->ifbpstp_len > 0) { \ error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);\ } \ BRIDGE_LOCK(sc); \ kfree_data(outbuf, buflen); \ return (error); \ } while (0) static int bridge_ioctl_gifsstp32(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbpstpconf32 * __single bifstp = arg; int error = 0; BRIDGE_IOCTL_GIFSSTP; return error; } static int bridge_ioctl_gifsstp64(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbpstpconf64 * __single bifstp = arg; int error = 0; BRIDGE_IOCTL_GIFSSTP; return error; } static int bridge_ioctl_sproto(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { #if BRIDGESTP struct ifbrparam *param = arg; return bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto); #else /* !BRIDGESTP */ #pragma unused(sc, arg) return EOPNOTSUPP; #endif /* !BRIDGESTP */ } static int bridge_ioctl_stxhc(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { #if BRIDGESTP struct ifbrparam *param = arg; return bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc); #else /* !BRIDGESTP */ #pragma unused(sc, arg) return EOPNOTSUPP; #endif /* !BRIDGESTP */ } static int bridge_ioctl_ghostfilter(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbrhostfilter * __single req = arg; struct bridge_iflist *bif; bif = bridge_lookup_member(sc, req->ifbrhf_ifsname); if (bif == NULL) { return ENOENT; } bzero(req, sizeof(struct ifbrhostfilter)); if (bif->bif_flags & BIFF_HOST_FILTER) { req->ifbrhf_flags |= IFBRHF_ENABLED; bcopy(bif->bif_hf_hwsrc, req->ifbrhf_hwsrca, ETHER_ADDR_LEN); req->ifbrhf_ipsrc = bif->bif_hf_ipsrc.s_addr; } return 0; } static int bridge_ioctl_shostfilter(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbrhostfilter * __single req = arg; struct bridge_iflist *bif; bif = bridge_lookup_member(sc, req->ifbrhf_ifsname); if (bif == NULL) { return ENOENT; } if (bif_has_mac_nat(bif)) { /* no host filter with MAC-NAT */ return EINVAL; } if (req->ifbrhf_flags & IFBRHF_ENABLED) { bif->bif_flags |= BIFF_HOST_FILTER; if (req->ifbrhf_flags & IFBRHF_HWSRC) { bcopy(req->ifbrhf_hwsrca, bif->bif_hf_hwsrc, ETHER_ADDR_LEN); if (bcmp(req->ifbrhf_hwsrca, ethernulladdr, ETHER_ADDR_LEN) != 0) { bif->bif_flags |= BIFF_HF_HWSRC; } else { bif->bif_flags &= ~BIFF_HF_HWSRC; } } if (req->ifbrhf_flags & IFBRHF_IPSRC) { bif->bif_hf_ipsrc.s_addr = req->ifbrhf_ipsrc; if (bif->bif_hf_ipsrc.s_addr != INADDR_ANY) { bif->bif_flags |= BIFF_HF_IPSRC; } else { bif->bif_flags &= ~BIFF_HF_IPSRC; } } } else { bif->bif_flags &= ~(BIFF_HOST_FILTER | BIFF_HF_HWSRC | BIFF_HF_IPSRC); bzero(bif->bif_hf_hwsrc, ETHER_ADDR_LEN); bif->bif_hf_ipsrc.s_addr = INADDR_ANY; } return 0; } static char *__indexable bridge_mac_nat_entry_out(struct mac_nat_entry_list * list, unsigned int * count_p, char *__indexable buf, unsigned int * len_p) { unsigned int count = *count_p; struct ifbrmne ifbmne; unsigned int len = *len_p; struct mac_nat_entry *mne; unsigned long now; bzero(&ifbmne, sizeof(ifbmne)); LIST_FOREACH(mne, list, mne_list) { if (len < sizeof(ifbmne)) { break; } snprintf(ifbmne.ifbmne_ifname, sizeof(ifbmne.ifbmne_ifname), "%s", mne->mne_bif->bif_ifp->if_xname); memcpy(ifbmne.ifbmne_mac, mne->mne_mac, sizeof(ifbmne.ifbmne_mac)); now = (unsigned long) net_uptime(); if (now < mne->mne_expire) { ifbmne.ifbmne_expire = mne->mne_expire - now; } else { ifbmne.ifbmne_expire = 0; } if ((mne->mne_flags & MNE_FLAGS_IPV6) != 0) { ifbmne.ifbmne_af = AF_INET6; ifbmne.ifbmne_ip6_addr = mne->mne_ip6; } else { ifbmne.ifbmne_af = AF_INET; ifbmne.ifbmne_ip_addr = mne->mne_ip; } memcpy(buf, &ifbmne, sizeof(ifbmne)); count++; buf += sizeof(ifbmne); len -= sizeof(ifbmne); } *count_p = count; *len_p = len; return buf; } /* * bridge_ioctl_gmnelist() * Perform the get mac_nat_entry list ioctl. * * Note: * The struct ifbrmnelist32 and struct ifbrmnelist64 have the same * field size/layout except for the last field ifbml_buf, the user-supplied * buffer pointer. That is passed in separately via the 'user_addr' * parameter from the respective 32-bit or 64-bit ioctl routine. */ static int bridge_ioctl_gmnelist(struct bridge_softc *sc, struct ifbrmnelist32 *mnl, user_addr_t user_addr) { unsigned int count; char *buf; int error = 0; char *outbuf = NULL; struct mac_nat_entry *mne; unsigned int buflen; unsigned int len; mnl->ifbml_elsize = sizeof(struct ifbrmne); count = 0; LIST_FOREACH(mne, &sc->sc_mne_list, mne_list) { count++; } LIST_FOREACH(mne, &sc->sc_mne_list_v6, mne_list) { count++; } buflen = sizeof(struct ifbrmne) * count; if (buflen == 0 || mnl->ifbml_len == 0) { mnl->ifbml_len = buflen; return error; } BRIDGE_UNLOCK(sc); outbuf = kalloc_data(buflen, Z_WAITOK | Z_ZERO); BRIDGE_LOCK(sc); count = 0; buf = outbuf; len = min(mnl->ifbml_len, buflen); buf = bridge_mac_nat_entry_out(&sc->sc_mne_list, &count, buf, &len); buf = bridge_mac_nat_entry_out(&sc->sc_mne_list_v6, &count, buf, &len); mnl->ifbml_len = count * sizeof(struct ifbrmne); BRIDGE_UNLOCK(sc); if (mnl->ifbml_len > 0) { error = copyout(outbuf, user_addr, mnl->ifbml_len); } kfree_data(outbuf, buflen); BRIDGE_LOCK(sc); return error; } static int bridge_ioctl_gmnelist64(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbrmnelist64 * __single mnl = arg; return bridge_ioctl_gmnelist(sc, arg, mnl->ifbml_buf); } static int bridge_ioctl_gmnelist32(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbrmnelist32 * __single mnl = arg; return bridge_ioctl_gmnelist(sc, arg, CAST_USER_ADDR_T(mnl->ifbml_buf)); } /* * bridge_ioctl_gifstats() * Return per-member stats. * * Note: * The ifbrmreq32 and ifbrmreq64 structures have the same * field size/layout except for the last field brmr_buf, the user-supplied * buffer pointer. That is passed in separately via the 'user_addr' * parameter from the respective 32-bit or 64-bit ioctl routine. */ static int bridge_ioctl_gifstats(struct bridge_softc *sc, struct ifbrmreq32 *mreq, user_addr_t user_addr) { struct bridge_iflist *bif; int error = 0; unsigned int buflen; bif = bridge_lookup_member(sc, mreq->brmr_ifname); if (bif == NULL) { error = ENOENT; goto done; } buflen = mreq->brmr_elsize = sizeof(struct ifbrmstats); if (buflen == 0 || mreq->brmr_len == 0) { mreq->brmr_len = buflen; goto done; } if (mreq->brmr_len != 0 && mreq->brmr_len < buflen) { error = ENOBUFS; goto done; } mreq->brmr_len = buflen; error = copyout(&bif->bif_stats, user_addr, buflen); done: return error; } static int bridge_ioctl_gifstats32(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbrmreq32 * __single mreq = arg; return bridge_ioctl_gifstats(sc, arg, mreq->brmr_buf); } static int bridge_ioctl_gifstats64(struct bridge_softc *sc, void *__sized_by(arg_len) arg, size_t arg_len __unused) { struct ifbrmreq64 * __single mreq = arg; return bridge_ioctl_gifstats(sc, arg, mreq->brmr_buf); } /* * bridge_proto_attach_changed * * Called when protocol attachment on the interface changes. */ static void bridge_proto_attach_changed(struct ifnet *ifp) { boolean_t changed = FALSE; struct bridge_iflist *bif; boolean_t input_broadcast; struct bridge_softc * __single sc = ifp->if_bridge; BRIDGE_LOG(LOG_DEBUG, BR_DBGF_LIFECYCLE, "%s", ifp->if_xname); if (sc == NULL) { return; } input_broadcast = interface_needs_input_broadcast(ifp); BRIDGE_LOCK(sc); bif = bridge_lookup_member_if(sc, ifp); if (bif != NULL) { changed = bif_set_input_broadcast(bif, input_broadcast); } BRIDGE_UNLOCK(sc); if (changed) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_LIFECYCLE, "%s input broadcast %s", ifp->if_xname, input_broadcast ? "ENABLED" : "DISABLED"); } return; } /* * interface_media_active: * * Tells if an interface media is active. */ static int interface_media_active(struct ifnet *ifp) { struct ifmediareq ifmr; int status = 0; bzero(&ifmr, sizeof(ifmr)); if (ifnet_ioctl(ifp, 0, SIOCGIFMEDIA, &ifmr) == 0) { if ((ifmr.ifm_status & IFM_AVALID) && ifmr.ifm_count > 0) { status = ifmr.ifm_status & IFM_ACTIVE ? 1 : 0; } } return status; } /* * bridge_updatelinkstatus: * * Update the media active status of the bridge based on the * media active status of its member. * If changed, return the corresponding onf/off link event. */ static u_int32_t bridge_updatelinkstatus(struct bridge_softc *sc) { struct bridge_iflist *bif; int active_member = 0; u_int32_t event_code = 0; BRIDGE_LOCK_ASSERT_HELD(sc); /* * Find out if we have an active interface */ TAILQ_FOREACH(bif, &sc->sc_iflist, bif_next) { if (bif->bif_flags & BIFF_MEDIA_ACTIVE) { active_member = 1; break; } } if (active_member && !(sc->sc_flags & SCF_MEDIA_ACTIVE)) { sc->sc_flags |= SCF_MEDIA_ACTIVE; event_code = KEV_DL_LINK_ON; } else if (!active_member && (sc->sc_flags & SCF_MEDIA_ACTIVE)) { sc->sc_flags &= ~SCF_MEDIA_ACTIVE; event_code = KEV_DL_LINK_OFF; } return event_code; } /* * bridge_iflinkevent: */ static void bridge_iflinkevent(struct ifnet *ifp) { struct bridge_softc * __single sc = ifp->if_bridge; struct bridge_iflist *bif; u_int32_t event_code = 0; int media_active; BRIDGE_LOG(LOG_DEBUG, BR_DBGF_LIFECYCLE, "%s", ifp->if_xname); /* Check if the interface is a bridge member */ if (sc == NULL) { return; } media_active = interface_media_active(ifp); BRIDGE_LOCK(sc); bif = bridge_lookup_member_if(sc, ifp); if (bif != NULL) { if (media_active) { bif->bif_flags |= BIFF_MEDIA_ACTIVE; } else { bif->bif_flags &= ~BIFF_MEDIA_ACTIVE; } if (sc->sc_mac_nat_bif != NULL) { bridge_mac_nat_flush_entries(sc, bif); } event_code = bridge_updatelinkstatus(sc); } BRIDGE_UNLOCK(sc); if (event_code != 0) { bridge_link_event(sc->sc_ifp, event_code); } } /* * bridge_delayed_callback: * * Makes a delayed call */ static void bridge_delayed_callback(void *param, __unused void *param2) { struct bridge_delayed_call *call = (struct bridge_delayed_call *)param; struct bridge_softc *sc = call->bdc_sc; #if BRIDGE_DELAYED_CALLBACK_DEBUG if (bridge_delayed_callback_delay > 0) { struct timespec ts; ts.tv_sec = bridge_delayed_callback_delay; ts.tv_nsec = 0; BRIDGE_LOG(LOG_NOTICE, 0, "sleeping for %d seconds", bridge_delayed_callback_delay); msleep(&bridge_delayed_callback_delay, NULL, PZERO, __func__, &ts); BRIDGE_LOG(LOG_NOTICE, 0, "awoken"); } #endif /* BRIDGE_DELAYED_CALLBACK_DEBUG */ BRIDGE_LOCK(sc); #if BRIDGE_DELAYED_CALLBACK_DEBUG BRIDGE_LOG(LOG_DEBUG, BR_DBGF_DELAYED_CALL, "%s call 0x%llx flags 0x%x", sc->sc_if_xname, (uint64_t)VM_KERNEL_ADDRPERM(call), call->bdc_flags); } #endif /* BRIDGE_DELAYED_CALLBACK_DEBUG */ if (call->bdc_flags & BDCF_CANCELLING) { wakeup(call); } else { if ((sc->sc_flags & SCF_DETACHING) == 0) { (*call->bdc_func)(sc); } } call->bdc_flags &= ~BDCF_OUTSTANDING; BRIDGE_UNLOCK(sc); } /* * bridge_schedule_delayed_call: * * Schedule a function to be called on a separate thread * The actual call may be scheduled to run at a given time or ASAP. */ static void bridge_schedule_delayed_call(struct bridge_delayed_call *call) { uint64_t deadline = 0; struct bridge_softc *sc = call->bdc_sc; BRIDGE_LOCK_ASSERT_HELD(sc); if ((sc->sc_flags & SCF_DETACHING) || (call->bdc_flags & (BDCF_OUTSTANDING | BDCF_CANCELLING))) { return; } if (call->bdc_ts.tv_sec || call->bdc_ts.tv_nsec) { nanoseconds_to_absolutetime( (uint64_t)call->bdc_ts.tv_sec * NSEC_PER_SEC + call->bdc_ts.tv_nsec, &deadline); clock_absolutetime_interval_to_deadline(deadline, &deadline); } call->bdc_flags = BDCF_OUTSTANDING; #if BRIDGE_DELAYED_CALLBACK_DEBUG BRIDGE_LOG(LOG_DEBUG, BR_DBGF_DELAYED_CALL, "%s call 0x%llx flags 0x%x", sc->sc_if_xname, (uint64_t)VM_KERNEL_ADDRPERM(call), call->bdc_flags); } #endif /* BRIDGE_DELAYED_CALLBACK_DEBUG */ if (call->bdc_ts.tv_sec || call->bdc_ts.tv_nsec) { thread_call_func_delayed( (thread_call_func_t)bridge_delayed_callback, call, deadline); } else { if (call->bdc_thread_call == NULL) { call->bdc_thread_call = thread_call_allocate( (thread_call_func_t)bridge_delayed_callback, call); } thread_call_enter(call->bdc_thread_call); } } /* * bridge_cancel_delayed_call: * * Cancel a queued or running delayed call. * If call is running, does not return until the call is done to * prevent race condition with the brigde interface getting destroyed */ static void bridge_cancel_delayed_call(struct bridge_delayed_call *call) { boolean_t result; struct bridge_softc *sc = call->bdc_sc; /* * The call was never scheduled */ if (sc == NULL) { return; } BRIDGE_LOCK_ASSERT_HELD(sc); call->bdc_flags |= BDCF_CANCELLING; while (call->bdc_flags & BDCF_OUTSTANDING) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_DELAYED_CALL, "%s call 0x%llx flags 0x%x", sc->sc_if_xname, (uint64_t)VM_KERNEL_ADDRPERM(call), call->bdc_flags); result = thread_call_func_cancel( (thread_call_func_t)bridge_delayed_callback, call, FALSE); if (result) { /* * We managed to dequeue the delayed call */ call->bdc_flags &= ~BDCF_OUTSTANDING; } else { /* * Wait for delayed call do be done running */ msleep(call, &sc->sc_mtx, PZERO, __func__, NULL); } } call->bdc_flags &= ~BDCF_CANCELLING; } /* * bridge_cleanup_delayed_call: * * Dispose resource allocated for a delayed call * Assume the delayed call is not queued or running . */ static void bridge_cleanup_delayed_call(struct bridge_delayed_call *call) { boolean_t result; struct bridge_softc *sc = call->bdc_sc; /* * The call was never scheduled */ if (sc == NULL) { return; } BRIDGE_LOCK_ASSERT_HELD(sc); VERIFY((call->bdc_flags & BDCF_OUTSTANDING) == 0); VERIFY((call->bdc_flags & BDCF_CANCELLING) == 0); if (call->bdc_thread_call != NULL) { result = thread_call_free(call->bdc_thread_call); if (result == FALSE) { panic("%s thread_call_free() failed for call %p", __func__, call); } call->bdc_thread_call = NULL; } } /* * bridge_init: * * Initialize a bridge interface. */ static int bridge_init(struct ifnet *ifp) { struct bridge_softc *sc = (struct bridge_softc *)ifp->if_softc; errno_t error; BRIDGE_LOCK_ASSERT_HELD(sc); if ((ifnet_flags(ifp) & IFF_RUNNING)) { return 0; } error = ifnet_set_flags(ifp, IFF_RUNNING, IFF_RUNNING); /* * Calling bridge_aging_timer() is OK as there are no entries to * age so we're just going to arm the timer */ bridge_aging_timer(sc); #if BRIDGESTP if (error == 0) { bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ } #endif /* BRIDGESTP */ return error; } /* * bridge_ifstop: * * Stop the bridge interface. */ static void bridge_ifstop(struct ifnet *ifp, int disable) { #pragma unused(disable) struct bridge_softc * __single sc = ifp->if_softc; BRIDGE_LOCK_ASSERT_HELD(sc); if ((ifnet_flags(ifp) & IFF_RUNNING) == 0) { return; } bridge_cancel_delayed_call(&sc->sc_aging_timer); #if BRIDGESTP bstp_stop(&sc->sc_stp); #endif /* BRIDGESTP */ bridge_rtflush(sc, IFBF_FLUSHDYN); (void) ifnet_set_flags(ifp, 0, IFF_RUNNING); } static const uint32_t checksum_request_flags = (MBUF_CSUM_REQ_TCP | MBUF_CSUM_REQ_UDP | MBUF_CSUM_REQ_TCPIPV6 | MBUF_CSUM_REQ_UDPIPV6); static const mbuf_csum_performed_flags_t checksum_performed_all_good = (MBUF_CSUM_DID_IP | MBUF_CSUM_IP_GOOD | MBUF_CSUM_DID_DATA | MBUF_CSUM_PSEUDO_HDR); /* * bridge_compute_cksum: * * If the packet has checksum flags, compare the hardware checksum * capabilities of the source and destination interfaces. If they * are the same, there's nothing to do. If they are different, * finalize the checksum so that it can be sent on the destination * interface. */ static void bridge_compute_cksum(struct ifnet *src_if, struct ifnet *dst_if, struct mbuf *m) { uint32_t csum_flags; uint16_t dst_hw_csum; uint32_t did_sw = 0; struct ether_header *eh; uint16_t src_hw_csum; if (src_if == dst_if) { return; } csum_flags = m->m_pkthdr.csum_flags & IF_HWASSIST_CSUM_MASK; if (csum_flags == 0) { /* no checksum offload */ return; } /* * if destination/source differ in checksum offload * capabilities, finalize/compute the checksum */ dst_hw_csum = IF_HWASSIST_CSUM_FLAGS(dst_if->if_hwassist); src_hw_csum = IF_HWASSIST_CSUM_FLAGS(src_if->if_hwassist); if (dst_hw_csum == src_hw_csum) { return; } eh = mtod(m, struct ether_header *); switch (eh->ether_type) { case HTONS_ETHERTYPE_IP: did_sw = in_finalize_cksum(m, sizeof(*eh), csum_flags); break; case HTONS_ETHERTYPE_IPV6: did_sw = in6_finalize_cksum(m, sizeof(*eh), -1, -1, csum_flags); break; } BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "[%s -> %s] before 0x%x did 0x%x after 0x%x", src_if->if_xname, dst_if->if_xname, csum_flags, did_sw, m->m_pkthdr.csum_flags); } static inline errno_t bridge_transmit(ifnet_t ifp, mbuf_t m) { struct flowadv adv = { .code = FADV_SUCCESS }; errno_t error; int flags = DLIL_OUTPUT_FLAGS_RAW; flags = (if_bridge_output_skip_filters != 0) ? (DLIL_OUTPUT_FLAGS_RAW | DLIL_OUTPUT_FLAGS_SKIP_IF_FILTERS) : DLIL_OUTPUT_FLAGS_RAW; error = dlil_output(ifp, 0, m, NULL, NULL, flags, &adv); if (error == 0) { if (adv.code == FADV_FLOW_CONTROLLED) { error = EQFULL; } else if (adv.code == FADV_SUSPENDED) { error = EQSUSPENDED; } } return error; } static int get_last_ip6_hdr(struct mbuf *m, int off, int proto, int * nxtp, bool *is_fragmented) { int newoff; *is_fragmented = false; while (1) { newoff = ip6_nexthdr(m, off, proto, nxtp); if (newoff < 0) { return off; } else if (newoff < off) { return -1; /* invalid */ } else if (newoff == off) { return newoff; } off = newoff; proto = *nxtp; if (proto == IPPROTO_FRAGMENT) { *is_fragmented = true; } } } #define __ATOMIC_INC(s) os_atomic_inc(&s, relaxed) static int bridge_get_ip_proto(struct mbuf * * mp, u_int mac_hlen, bool is_ipv4, ip_packet_info_t info_p, struct bripstats * stats_p) { int error = 0; u_int hlen; u_int ip_hlen; u_int ip_pay_len; struct mbuf * m0 = *mp; int off; int opt_len = 0; int proto = 0; bzero(info_p, sizeof(*info_p)); if (is_ipv4) { struct ip * ip; u_int ip_total_len; /* IPv4 */ hlen = mac_hlen + sizeof(struct ip); if (m0->m_pkthdr.len < hlen) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "Short IP packet %d < %d", m0->m_pkthdr.len, hlen); error = _EBADIP; __ATOMIC_INC(stats_p->bips_bad_ip); goto done; } if (m0->m_len < hlen) { *mp = m0 = m_pullup(m0, hlen); if (m0 == NULL) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "m_pullup failed hlen %d", hlen); error = ENOBUFS; __ATOMIC_INC(stats_p->bips_bad_ip); goto done; } } ip = (struct ip *)mtodo(m0, mac_hlen); if (IP_VHL_V(ip->ip_vhl) != IPVERSION) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "bad IP version"); error = _EBADIP; __ATOMIC_INC(stats_p->bips_bad_ip); goto done; } ip_hlen = IP_VHL_HL(ip->ip_vhl) << 2; if (ip_hlen < sizeof(struct ip)) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "bad IP header length %d < %d", ip_hlen, (int)sizeof(struct ip)); error = _EBADIP; __ATOMIC_INC(stats_p->bips_bad_ip); goto done; } hlen = mac_hlen + ip_hlen; if (m0->m_len < hlen) { *mp = m0 = m_pullup(m0, hlen); if (m0 == NULL) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "m_pullup failed hlen %d", hlen); error = ENOBUFS; __ATOMIC_INC(stats_p->bips_bad_ip); goto done; } ip = (struct ip *)mtodo(m0, mac_hlen); } ip_total_len = ntohs(ip->ip_len); if (ip_total_len < ip_hlen) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "IP total len %d < header len %d", ip_total_len, ip_hlen); error = _EBADIP; __ATOMIC_INC(stats_p->bips_bad_ip); goto done; } if (ip_total_len > (m0->m_pkthdr.len - mac_hlen)) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "invalid IP payload length %d > %d", ip_total_len, (m0->m_pkthdr.len - mac_hlen)); error = _EBADIP; __ATOMIC_INC(stats_p->bips_bad_ip); goto done; } ip_pay_len = ip_total_len - ip_hlen; info_p->ip_proto = ip->ip_p; info_p->ip_hdr = mtodo(m0, mac_hlen); info_p->ip_m0_len = m0->m_len - mac_hlen; info_p->ip_hlen = ip_hlen; #define FRAG_BITS (IP_OFFMASK | IP_MF) if ((ntohs(ip->ip_off) & FRAG_BITS) != 0) { info_p->ip_is_fragmented = true; } __ATOMIC_INC(stats_p->bips_ip); } else { struct ip6_hdr *ip6; /* IPv6 */ hlen = mac_hlen + sizeof(struct ip6_hdr); if (m0->m_pkthdr.len < hlen) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "short IPv6 packet %d < %d", m0->m_pkthdr.len, hlen); error = _EBADIPV6; __ATOMIC_INC(stats_p->bips_bad_ip6); goto done; } if (m0->m_len < hlen) { *mp = m0 = m_pullup(m0, hlen); if (m0 == NULL) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "m_pullup failed hlen %d", hlen); error = ENOBUFS; __ATOMIC_INC(stats_p->bips_bad_ip6); goto done; } } ip6 = (struct ip6_hdr *)(mtodo(m0, mac_hlen)); if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "bad IPv6 version"); error = _EBADIPV6; __ATOMIC_INC(stats_p->bips_bad_ip6); goto done; } off = get_last_ip6_hdr(m0, mac_hlen, IPPROTO_IPV6, &proto, &info_p->ip_is_fragmented); if (off < 0 || m0->m_pkthdr.len < off) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "ip6_lasthdr() returned %d", off); error = _EBADIPV6; __ATOMIC_INC(stats_p->bips_bad_ip6); goto done; } ip_hlen = sizeof(*ip6); opt_len = off - mac_hlen - ip_hlen; if (opt_len < 0) { error = _EBADIPV6; __ATOMIC_INC(stats_p->bips_bad_ip6); goto done; } ip_pay_len = ntohs(ip6->ip6_plen); if (ip_pay_len > (m0->m_pkthdr.len - mac_hlen - ip_hlen)) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "invalid IPv6 payload length %d > %d", ip_pay_len, (m0->m_pkthdr.len - mac_hlen - ip_hlen)); error = _EBADIPV6; __ATOMIC_INC(stats_p->bips_bad_ip6); goto done; } info_p->ip_proto = proto; info_p->ip_hdr = mtodo(m0, mac_hlen); info_p->ip_m0_len = m0->m_len - mac_hlen; info_p->ip_hlen = ip_hlen; __ATOMIC_INC(stats_p->bips_ip6); } BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "IPv%c proto %d ip %u pay %u opt %u pkt %u%s", is_ipv4 ? '4' : '6', proto, ip_hlen, ip_pay_len, opt_len, m0->m_pkthdr.len, info_p->ip_is_fragmented ? " frag" : ""); info_p->ip_pay_len = ip_pay_len; info_p->ip_opt_len = opt_len; info_p->ip_is_ipv4 = is_ipv4; done: return error; } static int bridge_get_tcp_header(struct mbuf * * mp, u_int mac_hlen, bool is_ipv4, ip_packet_info_t info_p, struct bripstats * stats_p) { int error; u_int hlen; error = bridge_get_ip_proto(mp, mac_hlen, is_ipv4, info_p, stats_p); if (error != 0) { goto done; } if (info_p->ip_proto != IPPROTO_TCP) { /* not a TCP frame, not an error, just a bad guess */ BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "non-TCP (%d) IPv%c frame %d bytes", info_p->ip_proto, is_ipv4 ? '4' : '6', (*mp)->m_pkthdr.len); goto done; } if (info_p->ip_is_fragmented) { /* both TSO and IP fragmentation don't make sense */ BRIDGE_LOG(LOG_NOTICE, BR_DBGF_CHECKSUM, "fragmented TSO packet?"); __ATOMIC_INC(stats_p->bips_bad_tcp); error = _EBADTCP; goto done; } hlen = mac_hlen + info_p->ip_hlen + sizeof(struct tcphdr) + info_p->ip_opt_len; if ((*mp)->m_len < hlen) { *mp = m_pullup(*mp, hlen); if (*mp == NULL) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "m_pullup %d failed", hlen); __ATOMIC_INC(stats_p->bips_bad_tcp); error = _EBADTCP; goto done; } } info_p->ip_proto_hdr = info_p->ip_hdr + info_p->ip_hlen + info_p->ip_opt_len; done: return error; } static inline void proto_csum_stats_increment(uint8_t proto, struct brcsumstats * stats_p) { if (proto == IPPROTO_TCP) { __ATOMIC_INC(stats_p->brcs_tcp_checksum); } else { __ATOMIC_INC(stats_p->brcs_udp_checksum); } return; } #define ETHER_TYPE_FLAG_NONE 0x00 #define ETHER_TYPE_FLAG_IPV4 0x01 #define ETHER_TYPE_FLAG_IPV6 0x02 #define ETHER_TYPE_FLAG_ARP 0x04 #define ETHER_TYPE_FLAG_IP (ETHER_TYPE_FLAG_IPV4 | ETHER_TYPE_FLAG_IPV6) #define ETHER_TYPE_FLAG_IP_ARP (ETHER_TYPE_FLAG_IP | ETHER_TYPE_FLAG_ARP) static inline bool ether_type_flag_is_ip(ether_type_flag_t flag) { return (flag & ETHER_TYPE_FLAG_IP) != 0; } static inline ether_type_flag_t ether_type_flag_get(uint16_t ether_type) { ether_type_flag_t flag = ETHER_TYPE_FLAG_NONE; switch (ether_type) { case HTONS_ETHERTYPE_IP: flag = ETHER_TYPE_FLAG_IPV4; break; case HTONS_ETHERTYPE_IPV6: flag = ETHER_TYPE_FLAG_IPV6; break; case HTONS_ETHERTYPE_ARP: flag = ETHER_TYPE_FLAG_ARP; break; default: break; } return flag; } static bool ether_header_type_is_ip(struct ether_header * eh, bool *is_ipv4) { uint16_t ether_type; bool is_ip = TRUE; ether_type = ntohs(eh->ether_type); switch (ether_type) { case ETHERTYPE_IP: *is_ipv4 = TRUE; break; case ETHERTYPE_IPV6: *is_ipv4 = FALSE; break; default: is_ip = FALSE; break; } return is_ip; } static errno_t bridge_verify_checksum(struct mbuf * * mp, struct ifbrmstats *stats_p) { struct brcsumstats *csum_stats_p; struct ether_header *eh; errno_t error = 0; ip_packet_info info; bool is_ipv4; struct mbuf * m; u_int mac_hlen = sizeof(struct ether_header); uint16_t sum; bool valid; eh = mtod(*mp, struct ether_header *); if (!ether_header_type_is_ip(eh, &is_ipv4)) { goto done; } error = bridge_get_ip_proto(mp, mac_hlen, is_ipv4, &info, &stats_p->brms_out_ip); m = *mp; if (error != 0) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "bridge_get_ip_proto failed %d", error); goto done; } if (is_ipv4) { if ((m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) != 0) { /* hardware offloaded IP header checksum */ valid = (m->m_pkthdr.csum_flags & CSUM_IP_VALID) != 0; BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "IP checksum HW %svalid", valid ? "" : "in"); if (!valid) { __ATOMIC_INC(stats_p->brms_out_cksum_bad_hw.brcs_ip_checksum); error = _EBADIPCHECKSUM; goto done; } __ATOMIC_INC(stats_p->brms_out_cksum_good_hw.brcs_ip_checksum); } else { /* verify */ sum = inet_cksum(m, 0, mac_hlen, info.ip_hlen); valid = (sum == 0); BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "IP checksum SW %svalid", valid ? "" : "in"); if (!valid) { __ATOMIC_INC(stats_p->brms_out_cksum_bad.brcs_ip_checksum); error = _EBADIPCHECKSUM; goto done; } __ATOMIC_INC(stats_p->brms_out_cksum_good.brcs_ip_checksum); } } if (info.ip_is_fragmented) { /* can't verify checksum on fragmented packets */ goto done; } switch (info.ip_proto) { case IPPROTO_TCP: __ATOMIC_INC(stats_p->brms_out_ip.bips_tcp); break; case IPPROTO_UDP: __ATOMIC_INC(stats_p->brms_out_ip.bips_udp); break; default: goto done; } /* check for hardware offloaded UDP/TCP checksum */ #define HW_CSUM (CSUM_DATA_VALID | CSUM_PSEUDO_HDR) if ((m->m_pkthdr.csum_flags & HW_CSUM) == HW_CSUM) { /* checksum verified by hardware */ valid = (m->m_pkthdr.csum_rx_val == 0xffff); BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "IPv%c %s checksum HW 0x%x %svalid", is_ipv4 ? '4' : '6', (info.ip_proto == IPPROTO_TCP) ? "TCP" : "UDP", m->m_pkthdr.csum_data, valid ? "" : "in" ); if (!valid) { /* bad checksum */ csum_stats_p = &stats_p->brms_out_cksum_bad_hw; error = (info.ip_proto == IPPROTO_TCP) ? _EBADTCPCHECKSUM : _EBADTCPCHECKSUM; } else { /* good checksum */ csum_stats_p = &stats_p->brms_out_cksum_good_hw; } proto_csum_stats_increment(info.ip_proto, csum_stats_p); goto done; } /* adjust frame to skip mac-layer header */ _mbuf_adjust_pkthdr_and_data(m, mac_hlen); if (is_ipv4) { sum = inet_cksum(m, info.ip_proto, info.ip_hlen, info.ip_pay_len); } else { sum = inet6_cksum(m, info.ip_proto, info.ip_hlen + info.ip_opt_len, info.ip_pay_len - info.ip_opt_len); } valid = (sum == 0); if (valid) { csum_stats_p = &stats_p->brms_out_cksum_good; } else { csum_stats_p = &stats_p->brms_out_cksum_bad; error = (info.ip_proto == IPPROTO_TCP) ? _EBADTCPCHECKSUM : _EBADUDPCHECKSUM; } proto_csum_stats_increment(info.ip_proto, csum_stats_p); BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "IPv%c %s checksum SW %svalid (0x%x) hlen %d paylen %d", is_ipv4 ? '4' : '6', (info.ip_proto == IPPROTO_TCP) ? "TCP" : "UDP", valid ? "" : "in", sum, info.ip_hlen, info.ip_pay_len); /* adjust frame back to start of mac-layer header */ _mbuf_adjust_pkthdr_and_data(m, -mac_hlen); done: return error; } static mbuf_t bridge_verify_checksum_list(ifnet_t bridge_ifp, struct bridge_iflist * dbif, mbuf_t in_list, bool is_ipv4) { mbuf_t next_packet; mblist ret; mblist_init(&ret); for (mbuf_ref_t scan = in_list; scan != NULL; scan = next_packet) { errno_t error; /* take packet out of the list */ next_packet = scan->m_nextpkt; scan->m_nextpkt = NULL; if (scan->m_pkthdr.rx_seg_cnt > 1) { /* LRO packet, compute checksum on large packet */ scan = bridge_filter_checksum(bridge_ifp, dbif, scan, is_ipv4, false, true); } else { /* verify checksum */ error = bridge_verify_checksum(&scan, &dbif->bif_stats); if (error != 0) { if (scan != NULL) { m_drop(scan, DROPTAP_FLAG_DIR_IN, DROP_REASON_BRIDGE_CHECKSUM, NULL, 0); scan = NULL; } } } /* add it back to the list */ if (scan != NULL) { mblist_append(&ret, scan); } } return ret.head; } static errno_t bridge_offload_checksum(struct mbuf * * mp, ip_packet_info * info_p, struct ifbrmstats * stats_p) { uint16_t * csum_p; errno_t error = 0; u_int hlen; struct mbuf * m0 = *mp; u_int mac_hlen = sizeof(struct ether_header); u_int pkt_hdr_len; struct tcphdr * tcp; u_int tcp_hlen; struct udphdr * udp; if (info_p->ip_is_ipv4) { /* compute IP header checksum */ struct ip *ip = (struct ip *)info_p->ip_hdr; ip->ip_sum = 0; ip->ip_sum = inet_cksum(m0, 0, mac_hlen, info_p->ip_hlen); __ATOMIC_INC(stats_p->brms_in_computed_cksum.brcs_ip_checksum); BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "IPv4 checksum 0x%x", ntohs(ip->ip_sum)); } if (info_p->ip_is_fragmented) { /* can't compute checksum on fragmented packets */ goto done; } pkt_hdr_len = m0->m_pkthdr.len; switch (info_p->ip_proto) { case IPPROTO_TCP: hlen = mac_hlen + info_p->ip_hlen + info_p->ip_opt_len + sizeof(struct tcphdr); if (m0->m_len < hlen) { *mp = m0 = m_pullup(m0, hlen); if (m0 == NULL) { __ATOMIC_INC(stats_p->brms_in_ip.bips_bad_tcp); error = _EBADTCP; goto done; } } tcp = (struct tcphdr *)(info_p->ip_hdr + info_p->ip_hlen + info_p->ip_opt_len); tcp_hlen = tcp->th_off << 2; hlen = mac_hlen + info_p->ip_hlen + info_p->ip_opt_len + tcp_hlen; if (hlen > pkt_hdr_len) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "bad tcp header length %u", tcp_hlen); __ATOMIC_INC(stats_p->brms_in_ip.bips_bad_tcp); error = _EBADTCP; goto done; } csum_p = &tcp->th_sum; __ATOMIC_INC(stats_p->brms_in_ip.bips_tcp); break; case IPPROTO_UDP: hlen = mac_hlen + info_p->ip_hlen + info_p->ip_opt_len + sizeof(*udp); if (m0->m_len < hlen) { *mp = m0 = m_pullup(m0, hlen); if (m0 == NULL) { __ATOMIC_INC(stats_p->brms_in_ip.bips_bad_udp); error = ENOBUFS; goto done; } } udp = (struct udphdr *)(info_p->ip_hdr + info_p->ip_hlen + info_p->ip_opt_len); csum_p = &udp->uh_sum; __ATOMIC_INC(stats_p->brms_in_ip.bips_udp); break; default: /* not TCP or UDP */ goto done; } *csum_p = 0; /* adjust frame to skip mac-layer header */ _mbuf_adjust_pkthdr_and_data(m0, mac_hlen); if (info_p->ip_is_ipv4) { *csum_p = inet_cksum(m0, info_p->ip_proto, info_p->ip_hlen, info_p->ip_pay_len); } else { *csum_p = inet6_cksum(m0, info_p->ip_proto, info_p->ip_hlen + info_p->ip_opt_len, info_p->ip_pay_len - info_p->ip_opt_len); } if (info_p->ip_proto == IPPROTO_UDP && *csum_p == 0) { /* RFC 1122 4.1.3.4 */ *csum_p = 0xffff; } /* adjust frame back to start of mac-layer header */ _mbuf_adjust_pkthdr_and_data(m0, -mac_hlen); proto_csum_stats_increment(info_p->ip_proto, &stats_p->brms_in_computed_cksum); /* indicate that the checksum is good */ mbuf_set_csum_performed(m0, checksum_performed_all_good, 0xffff); BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "IPv%c %s set checksum 0x%x", info_p->ip_is_ipv4 ? '4' : '6', (info_p->ip_proto == IPPROTO_TCP) ? "TCP" : "UDP", ntohs(*csum_p)); done: return error; } static inline void bridge_handle_checksum_op(ifnet_t src_ifp, ifnet_t dst_ifp, mbuf_t m, ChecksumOperation cksum_op) { switch (cksum_op) { case CHECKSUM_OPERATION_CLEAR_OFFLOAD: m->m_pkthdr.csum_flags &= ~CSUM_TX_FLAGS; break; case CHECKSUM_OPERATION_FINALIZE: /* the checksum might not be correct, finalize now */ VERIFY(dst_ifp != NULL); bridge_finalize_cksum(dst_ifp, m); break; case CHECKSUM_OPERATION_COMPUTE: VERIFY(dst_ifp != NULL && src_ifp != NULL); bridge_compute_cksum(src_ifp, dst_ifp, m); break; default: break; } return; } static uint32_t get_if_tso_mtu(struct ifnet * ifp, bool is_ipv4) { uint32_t tso_mtu; tso_mtu = is_ipv4 ? ifp->if_tso_v4_mtu : ifp->if_tso_v6_mtu; if (tso_mtu == 0) { tso_mtu = IP_MAXPACKET; } #if DEBUG || DEVELOPMENT #define REDUCED_TSO_MTU (16 * 1024) if (if_bridge_reduce_tso_mtu != 0 && tso_mtu > REDUCED_TSO_MTU) { tso_mtu = REDUCED_TSO_MTU; } #endif /* DEBUG || DEVELOPMENT */ return tso_mtu; } /* * tso_hwassist: * - determine whether the destination interface supports TSO offload * - if the packet is already marked for offload and the hardware supports * it, just allow the packet to continue on * - if not, parse the packet headers to verify that this is a large TCP * packet requiring segmentation; if the hardware doesn't support it * set need_sw_tso; otherwise, mark the packet for TSO offload */ static int tso_hwassist(struct mbuf **mp, bool is_ipv4, struct ifnet * ifp, u_int mac_hlen, int * mss_p, bool * need_gso, bool * is_large_tcp) { uint32_t csum_flags; int error = 0; ip_packet_info info; u_int32_t if_csum; u_int32_t if_tso; u_int32_t mbuf_tso; int mss = *mss_p; uint8_t seg_cnt = 0; bool supports_cksum = false; uint32_t pkt_mtu; struct bripstats stats; *need_gso = false; *is_large_tcp = false; if (is_ipv4) { /* * Enable both TCP and IP offload if the hardware supports it. * If the hardware doesn't support TCP offload, supports_cksum * will be false so we won't set either offload. */ if_csum = ifp->if_hwassist & (CSUM_TCP | CSUM_IP); supports_cksum = (if_csum & CSUM_TCP) != 0; if_tso = IFNET_TSO_IPV4; mbuf_tso = CSUM_TSO_IPV4; } else { if_csum = (ifp->if_hwassist & CSUM_TCPIPV6); supports_cksum = (if_csum & CSUM_TCPIPV6) != 0; if_tso = IFNET_TSO_IPV6; mbuf_tso = CSUM_TSO_IPV6; } BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "%s: does%s support checksum 0x%x if_csum 0x%x", ifp->if_xname, supports_cksum ? "" : " not", ifp->if_hwassist, if_csum); /* verify that this is a large TCP frame */ error = bridge_get_tcp_header(mp, mac_hlen, is_ipv4, &info, &stats); if (error != 0) { /* bad packet */ goto done; } if (info.ip_proto_hdr == NULL) { /* not a TCP packet */ goto done; } pkt_mtu = info.ip_hlen + info.ip_pay_len + info.ip_opt_len; if (mss == 0) { /* check for LRO */ seg_cnt = (*mp)->m_pkthdr.rx_seg_cnt; if (seg_cnt == 1 || (seg_cnt == 0 && pkt_mtu <= ifp->if_mtu)) { /* not actually a large packet */ goto done; } } if (mss == 0) { uint32_t hdr_len; struct tcphdr * tcp; tcp = (struct tcphdr *)info.ip_proto_hdr; hdr_len = info.ip_hlen + info.ip_opt_len + (tcp->th_off << 2); /* packet isn't marked, mark it now */ if (seg_cnt != 0) { uint32_t len; /* approximate the MSS using the LRO seg cnt */ len = mbuf_pkthdr_len(*mp) - hdr_len - ETHER_HDR_LEN; mss = len / seg_cnt; BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "%s: mss %d = len %d / seg cnt %d", ifp->if_xname, mss, len, seg_cnt); if (mss <= 0) { /* unexpected value */ mss = 0; goto done; } } else { mss = ifp->if_mtu - hdr_len - if_bridge_tso_reduce_mss_tx; assert(mss > 0); } csum_flags = mbuf_tso; if (supports_cksum) { csum_flags |= if_csum; } (*mp)->m_pkthdr.tso_segsz = mss; (*mp)->m_pkthdr.csum_flags |= csum_flags; (*mp)->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum); } *is_large_tcp = true; (*mp)->m_pkthdr.pkt_proto = IPPROTO_TCP; if ((ifp->if_hwassist & if_tso) == 0) { /* need gso if no hardware support */ *need_gso = true; } else { uint32_t tso_mtu = 0; tso_mtu = get_if_tso_mtu(ifp, is_ipv4); if (pkt_mtu > tso_mtu) { /* need gso if tso_mtu too small */ *need_gso = true; } } done: *mss_p = mss; return error; } /* * bridge_enqueue: * * Enqueue a packet list on a bridge member interface. * */ static int bridge_enqueue(ifnet_t bridge_ifp, ifnet_t src_if, ifnet_t dst_if, ether_type_flag_t etypef, mbuf_t in_list, ChecksumOperation orig_cksum_op, pkt_direction_t direction) { int enqueue_error = 0; mbuf_t next_packet; uint32_t out_errors = 0; mblist out_list; VERIFY(dst_if != NULL); mblist_init(&out_list); for (mbuf_ref_t scan = in_list; scan != NULL; scan = next_packet) { bool check_gso = false; ChecksumOperation cksum_op = orig_cksum_op; errno_t error = 0; bool is_ipv4 = false; int len; int mss = 0; bool need_gso = false; scan->m_flags |= M_PROTO1; /* set to avoid loops */ next_packet = scan->m_nextpkt; scan->m_nextpkt = NULL; len = mbuf_pkthdr_len(scan); is_ipv4 = (etypef == ETHER_TYPE_FLAG_IPV4); mss = _mbuf_get_tso_mss(scan); if (mss != 0) { /* packet is marked for segmentation */ check_gso = true; } else if (direction == pkt_direction_RX && scan->m_pkthdr.rx_seg_cnt != 0) { /* LRO packet */ check_gso = true; } else if (ether_type_flag_is_ip(etypef) && len > (bridge_ifp->if_mtu + ETHER_HDR_LEN)) { /* * Need to segment the packet if it is a large frame * and the destination interface does not support TSO. * * Note that with trailers, it's possible for a packet to * be large but not actually require segmentation. */ check_gso = true; } if (check_gso) { bool is_large_tcp = false; error = tso_hwassist(&scan, is_ipv4, dst_if, sizeof(struct ether_header), &mss, &need_gso, &is_large_tcp); if (is_large_tcp && cksum_op == CHECKSUM_OPERATION_CLEAR_OFFLOAD) { cksum_op = CHECKSUM_OPERATION_NONE; } } if (error != 0) { if (scan != NULL) { m_drop(scan, direction == pkt_direction_RX ? DROPTAP_FLAG_DIR_IN : DROPTAP_FLAG_DIR_OUT, DROP_REASON_BRIDGE_HWASSIST, NULL, 0); scan = NULL; } out_errors++; } else if (need_gso) { int mac_hlen = sizeof(struct ether_header); mblist segs; /* segment packets, add to list */ segs = gso_tcp_transmit(dst_if, scan, mac_hlen, is_ipv4); if (segs.head != NULL) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "%s (%s) append gso #segs %u bytes %u", bridge_ifp->if_xname, dst_if->if_xname, segs.count, segs.bytes); mblist_append_list(&out_list, segs); } else { out_errors++; } } else { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "%s (%s) append %d bytes mss %d op %d", bridge_ifp->if_xname, dst_if->if_xname, len, mss, cksum_op); bridge_handle_checksum_op(src_if, dst_if, scan, cksum_op); mblist_append(&out_list, scan); } } if (out_list.head != NULL) { enqueue_error = bridge_transmit(dst_if, out_list.head); if (enqueue_error != 0) { out_errors++; } BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "%s (%s) bridge_transmit packets %u bytes %u error %d", bridge_ifp->if_xname, dst_if->if_xname, out_list.count, out_list.bytes, enqueue_error); } if (out_list.count != 0 || out_errors != 0) { ifnet_stat_increment_out(bridge_ifp, out_list.count, out_list.bytes, out_errors); } return enqueue_error; } /* * bridge_member_output: * * Send output from a bridge member interface. This * performs the bridging function for locally originated * packets. * * The mbuf has the Ethernet header already attached. */ static errno_t bridge_member_output(struct bridge_softc *sc, ifnet_t ifp, mbuf_t *data) { struct bridge_iflist * bif = NULL; ifnet_t bridge_ifp; struct ether_header *eh; ether_type_flag_t etypef; struct ifnet *dst_if = NULL; uint16_t vlan; struct bridge_iflist *mac_nat_bif; ifnet_t mac_nat_ifp; mbuf_t m = *data; BRIDGE_LOG(LOG_DEBUG, BR_DBGF_OUTPUT, "ifp %s", ifp->if_xname); if (m->m_len < ETHER_HDR_LEN) { m = m_pullup(m, ETHER_HDR_LEN); if (m == NULL) { *data = NULL; return EJUSTRETURN; } } BRIDGE_LOCK(sc); mac_nat_bif = sc->sc_mac_nat_bif; mac_nat_ifp = (mac_nat_bif != NULL) ? mac_nat_bif->bif_ifp : NULL; if (mac_nat_ifp == ifp) { /* record the IP address used by the MAC NAT interface */ (void)bridge_mac_nat_output(sc, mac_nat_bif, data, NULL); m = *data; if (m == NULL) { /* packet was deallocated */ BRIDGE_UNLOCK(sc); return EJUSTRETURN; } } bridge_ifp = sc->sc_ifp; eh = mtod(m, struct ether_header *); vlan = VLANTAGOF(m); etypef = ether_type_flag_get(eh->ether_type); /* * APPLE MODIFICATION * If the packet is an 802.1X ethertype, then only send on the * original output interface. */ if (eh->ether_type == htons(ETHERTYPE_PAE)) { dst_if = ifp; goto sendunicast; } /* * If bridge is down, but the original output interface is up, * go ahead and send out that interface. Otherwise, the packet * is dropped below. */ if ((bridge_ifp->if_flags & IFF_RUNNING) == 0) { dst_if = ifp; goto sendunicast; } /* * If the packet is a multicast, or we don't know a better way to * get there, send to all interfaces. */ if (ETHER_IS_MULTICAST(eh->ether_dhost)) { dst_if = NULL; } else { bif = bridge_rtlookup_bif(sc, eh->ether_dhost, vlan); if (bif != NULL) { dst_if = bif->bif_ifp; } } if (dst_if == NULL) { struct mbuf *mc; errno_t error; bridge_span(sc, etypef, m); BRIDGE_LOCK2REF(sc, error); if (error != 0) { m_drop(m, DROPTAP_FLAG_DIR_OUT, DROP_REASON_BRIDGE_NOREF, NULL, 0); return EJUSTRETURN; } /* * Duplicate and send the packet across all member interfaces * except the originating interface. */ TAILQ_FOREACH(bif, &sc->sc_iflist, bif_next) { dst_if = bif->bif_ifp; if (dst_if == ifp) { /* skip the originating interface */ continue; } /* skip interface with inactive link status */ if ((bif->bif_flags & BIFF_MEDIA_ACTIVE) == 0) { continue; } /* skip interface that isn't running */ if ((dst_if->if_flags & IFF_RUNNING) == 0) { continue; } /* * If the interface is participating in spanning * tree, make sure the port is in a state that * allows forwarding. */ if ((bif->bif_ifflags & IFBIF_STP) && bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { continue; } /* * If the destination is the MAC NAT interface, * skip sending the packet. The packet can't be sent * if the source MAC is incorrect. */ if (dst_if == mac_nat_ifp) { continue; } /* make a deep copy to send on this member interface */ mc = m_dup(m, M_DONTWAIT); if (mc == NULL) { (void)ifnet_stat_increment_out(bridge_ifp, 0, 0, 1); continue; } (void)bridge_enqueue(bridge_ifp, ifp, dst_if, etypef, mc, CHECKSUM_OPERATION_COMPUTE, pkt_direction_TX); } BRIDGE_UNREF(sc); if ((ifp->if_flags & IFF_RUNNING) == 0) { m_drop(m, DROPTAP_FLAG_DIR_OUT, DROP_REASON_BRIDGE_NOT_RUNNING, NULL, 0); return EJUSTRETURN; } /* allow packet to continue on the originating interface */ return 0; } sendunicast: /* * XXX Spanning tree consideration here? */ bridge_span(sc, etypef, m); if ((dst_if->if_flags & IFF_RUNNING) == 0) { m_drop(m, DROPTAP_FLAG_DIR_OUT, DROP_REASON_BRIDGE_NOT_RUNNING, NULL, 0); BRIDGE_UNLOCK(sc); return EJUSTRETURN; } BRIDGE_UNLOCK(sc); if (dst_if == ifp) { /* allow packet to continue on the originating interface */ return 0; } if (dst_if != mac_nat_ifp) { (void) bridge_enqueue(bridge_ifp, ifp, dst_if, etypef, m, CHECKSUM_OPERATION_COMPUTE, pkt_direction_TX); } else { /* * This is not the original output interface * and the destination is the MAC NAT interface. * Drop the packet because the packet can't be sent * if the source MAC is incorrect. */ m_drop(m, DROPTAP_FLAG_DIR_OUT, DROP_REASON_BRIDGE_MAC_NAT_FAILURE, NULL, 0); } return EJUSTRETURN; } /* * Output callback. * * This routine is called externally from above only when if_bridge_txstart * is disabled; otherwise it is called internally by bridge_start(). */ static int bridge_output(struct ifnet *ifp, struct mbuf *m) { struct bridge_iflist *bif; struct bridge_softc * __single sc = ifnet_softc(ifp); struct ether_header *eh; ether_type_flag_t etypef; struct ifnet *dst_if = NULL; int error = 0; eh = mtod(m, struct ether_header *); etypef = ether_type_flag_get(eh->ether_type); BRIDGE_LOCK(sc); if (!IS_BCAST_MCAST(m)) { bif = bridge_rtlookup_bif(sc, eh->ether_dhost, 0); if (bif != NULL) { dst_if = bif->bif_ifp; } } (void) ifnet_stat_increment_out(ifp, 1, m->m_pkthdr.len, 0); BRIDGE_BPF_TAP_OUT(ifp, m); if (dst_if == NULL) { /* callee will unlock */ bridge_broadcast(sc, NULL, etypef, m); } else { ifnet_t bridge_ifp; bridge_ifp = sc->sc_ifp; BRIDGE_UNLOCK(sc); error = bridge_enqueue(bridge_ifp, NULL, dst_if, etypef, m, CHECKSUM_OPERATION_FINALIZE, pkt_direction_TX); } return error; } static void bridge_finalize_cksum(struct ifnet *ifp, struct mbuf *m) { struct ether_header *eh; bool is_ipv4; uint32_t sw_csum, hwcap; uint32_t did_sw; uint32_t csum_flags; eh = mtod(m, struct ether_header *); if (!ether_header_type_is_ip(eh, &is_ipv4)) { return; } /* do in software what the hardware cannot */ hwcap = (ifp->if_hwassist | CSUM_DATA_VALID); csum_flags = m->m_pkthdr.csum_flags; sw_csum = csum_flags & ~IF_HWASSIST_CSUM_FLAGS(hwcap); sw_csum &= IF_HWASSIST_CSUM_MASK; if (is_ipv4) { if ((hwcap & CSUM_PARTIAL) && !(sw_csum & CSUM_DELAY_DATA) && (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)) { if (m->m_pkthdr.csum_flags & CSUM_TCP) { uint16_t start = sizeof(*eh) + sizeof(struct ip); uint16_t ulpoff = m->m_pkthdr.csum_data & 0xffff; m->m_pkthdr.csum_flags |= (CSUM_DATA_VALID | CSUM_PARTIAL); m->m_pkthdr.csum_tx_stuff = (ulpoff + start); m->m_pkthdr.csum_tx_start = start; } else { sw_csum |= (CSUM_DELAY_DATA & m->m_pkthdr.csum_flags); } } did_sw = in_finalize_cksum(m, sizeof(*eh), sw_csum); } else { if ((hwcap & CSUM_PARTIAL) && !(sw_csum & CSUM_DELAY_IPV6_DATA) && (m->m_pkthdr.csum_flags & CSUM_DELAY_IPV6_DATA)) { if (m->m_pkthdr.csum_flags & CSUM_TCPIPV6) { uint16_t start = sizeof(*eh) + sizeof(struct ip6_hdr); uint16_t ulpoff = m->m_pkthdr.csum_data & 0xffff; m->m_pkthdr.csum_flags |= (CSUM_DATA_VALID | CSUM_PARTIAL); m->m_pkthdr.csum_tx_stuff = (ulpoff + start); m->m_pkthdr.csum_tx_start = start; } else { sw_csum |= (CSUM_DELAY_IPV6_DATA & m->m_pkthdr.csum_flags); } } did_sw = in6_finalize_cksum(m, sizeof(*eh), -1, -1, sw_csum); } BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "[%s] before 0x%x hwcap 0x%x sw_csum 0x%x did 0x%x after 0x%x", ifp->if_xname, csum_flags, hwcap, sw_csum, did_sw, m->m_pkthdr.csum_flags); } /* * bridge_start: * * Start output on a bridge. * * This routine is invoked by the start worker thread; because we never call * it directly, there is no need do deploy any serialization mechanism other * than what's already used by the worker thread, i.e. this is already single * threaded. * * This routine is called only when if_bridge_txstart is enabled. */ static void bridge_start(struct ifnet *ifp) { mbuf_ref_t m; for (;;) { if (ifnet_dequeue(ifp, &m) != 0) { break; } (void) bridge_output(ifp, m); } } static void prepare_input_packet(ifnet_t ifp, mbuf_t m) { mbuf_pkthdr_setrcvif(m, ifp); mbuf_pkthdr_setheader(m, mtod(m, void *)); /* adjust frame to skip mac-layer header */ _mbuf_adjust_pkthdr_and_data(m, ETHER_HDR_LEN); } static void mark_tso_checksum_ok(mbuf_t m) { if (_mbuf_get_tso_mss(m) != 0 || (m->m_pkthdr.csum_flags & checksum_request_flags) != 0) { mbuf_set_csum_performed(m, checksum_performed_all_good, 0xffff); } } static void inject_input_packet_list(ifnet_t ifp, mbuf_t in_list, bool m_proto1) { for (mbuf_t scan = in_list; scan != NULL; scan = scan->m_nextpkt) { /* mark the packets as arriving on the interface */ BRIDGE_BPF_TAP_IN(ifp, scan); if (m_proto1) { scan->m_flags |= M_PROTO1; /* set to avoid loops */ } prepare_input_packet(ifp, scan); mark_tso_checksum_ok(scan); } dlil_input_packet_list(ifp, in_list); return; } static void adjust_input_packet_list(mbuf_t in_list) { for (mbuf_t scan = in_list; scan != NULL; scan = scan->m_nextpkt) { mbuf_pkthdr_setheader(scan, mtod(scan, void *)); _mbuf_adjust_pkthdr_and_data(scan, ETHER_HDR_LEN); } } static bool in_addr_is_ours(struct in_addr ip) { struct in_ifaddr *ia; bool ours = false; lck_rw_lock_shared(&in_ifaddr_rwlock); TAILQ_FOREACH(ia, INADDR_HASH(ip.s_addr), ia_hash) { if (ia->ia_addr.sin_addr.s_addr == ip.s_addr) { ours = true; break; } } lck_rw_done(&in_ifaddr_rwlock); return ours; } static bool in6_addr_is_ours(const struct in6_addr * ip6_p, uint32_t ifscope) { struct in6_addr dst_ip; struct in6_ifaddr *ia6; bool ours = false; if (in6_embedded_scope && IN6_IS_ADDR_LINKLOCAL(ip6_p)) { /* need to embed scope ID for comparison */ bcopy(ip6_p, &dst_ip, sizeof(dst_ip)); dst_ip.s6_addr16[1] = htons(ifscope); ip6_p = &dst_ip; } lck_rw_lock_shared(&in6_ifaddr_rwlock); TAILQ_FOREACH(ia6, IN6ADDR_HASH(ip6_p), ia6_hash) { if (in6_are_addr_equal_scoped(&ia6->ia_addr.sin6_addr, ip6_p, ia6->ia_addr.sin6_scope_id, ifscope)) { ours = true; break; } } lck_rw_done(&in6_ifaddr_rwlock); return ours; } static bool ip_packet_info_dst_is_our_ip(ip_packet_info_t info_p, int index) { /* if the destination is our IP address, don't segment */ bool our_ip = false; if (info_p->ip_is_ipv4) { struct ip * hdr; struct in_addr dst_ip; hdr = (struct ip *)(info_p->ip_hdr); bcopy(&hdr->ip_dst, &dst_ip, sizeof(dst_ip)); our_ip = in_addr_is_ours(dst_ip); } else { struct ip6_hdr * hdr; hdr = (struct ip6_hdr *)(info_p->ip_hdr); our_ip = in6_addr_is_ours(&hdr->ip6_dst, index); } return our_ip; } typedef union { struct in_addr ip; struct in6_addr ip6; } ip_addr, *ip_addr_t; static void ip_packet_info_copy_dst_ip_addr(ip_packet_info_t info_p, ip_addr_t ipaddr) { if (info_p->ip_is_ipv4) { struct ip * hdr; hdr = (struct ip *)(info_p->ip_hdr); bcopy(&hdr->ip_dst, &ipaddr->ip, sizeof(ipaddr->ip)); } else { struct ip6_hdr * hdr; hdr = (struct ip6_hdr *)(info_p->ip_hdr); bcopy(&hdr->ip6_dst, &ipaddr->ip6, sizeof(ipaddr->ip6)); } } static bool ip_addr_are_equal(ip_addr_t addr1, ip_addr_t addr2, bool is_ipv4) { bool equal; if (is_ipv4) { equal = addr1->ip.s_addr == addr2->ip.s_addr; } else { equal = IN6_ARE_ADDR_EQUAL(&addr1->ip6, &addr2->ip6); } return equal; } static bool ip_addr_is_ours(ip_addr_t ipaddr, int index, bool is_ipv4) { bool our_ip; if (is_ipv4) { our_ip = in_addr_is_ours(ipaddr->ip); } else { our_ip = in6_addr_is_ours(&ipaddr->ip6, index); } return our_ip; } static void bridge_interface_input_list(ifnet_t bridge_ifp, ether_type_flag_t etypef, mblist list, bool bif_uses_virtio) { uint32_t in_errors = 0; bool is_ipv4; mblist in_list; ip_addr last_ip; bool last_ip_ours = false; bool last_ip_valid = false; u_int mac_hlen; bool may_forward = false; mbuf_t next_packet; switch (etypef) { case ETHER_TYPE_FLAG_IPV4: is_ipv4 = true; may_forward = (ipforwarding != 0); break; case ETHER_TYPE_FLAG_IPV6: is_ipv4 = false; may_forward = (ip6_forwarding != 0); break; } if (!may_forward) { in_list = list; goto done; } mblist_init(&in_list); mac_hlen = sizeof(struct ether_header); bzero(&last_ip, sizeof(last_ip)); for (mbuf_ref_t scan = list.head; scan != NULL; scan = next_packet) { int error; ip_packet_info info; bool ip_ours; struct ifbrmstats stats; /* XXX should really be accounted */ ip_addr this_ip; /* take it out of the list */ next_packet = scan->m_nextpkt; scan->m_nextpkt = NULL; /* check for TCP packet and get IP header */ error = bridge_get_tcp_header(&scan, mac_hlen, is_ipv4, &info, &stats.brms_in_ip); if (error != 0) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "%s bridge_get_tcp_header failed %d", bridge_ifp->if_xname, error); if (scan != NULL) { m_freem(scan); scan = NULL; } in_errors++; continue; } ip_packet_info_copy_dst_ip_addr(&info, &this_ip); if (last_ip_valid && ip_addr_are_equal(&last_ip, &this_ip, is_ipv4)) { /* use cached result */ ip_ours = last_ip_ours; } else { ip_ours = ip_addr_is_ours(&this_ip, bridge_ifp->if_index, is_ipv4); /* cache the result */ last_ip_valid = true; last_ip_ours = ip_ours; last_ip = this_ip; } /* if the packet is destined to us, just send it up */ if (ip_ours) { mblist_append(&in_list, scan); continue; } /* * If this is a TCP packet that's marked for TSO or LRO, or * we think it's a large packet, segment it. */ if (info.ip_proto_hdr != NULL && ((bif_uses_virtio && _mbuf_get_tso_mss(scan) != 0) || (!bif_uses_virtio && (scan->m_pkthdr.rx_seg_cnt > 1 || (mbuf_pkthdr_len(scan) > (bridge_ifp->if_mtu + ETHER_HDR_LEN)))))) { mblist seg; seg = gso_tcp_with_info(bridge_ifp, scan, &info, mac_hlen, is_ipv4, false); if (seg.head == NULL) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "gso_tcp returned no packets"); in_errors++; continue; } if (seg.count > 1) { /* packet was segmented+checksummed */ mblist_append_list(&in_list, seg); continue; } /* there's just one packet, no segmentation */ scan = seg.head; } /* need checksum if it's marked for checksum offload */ if (bif_uses_virtio && (scan->m_pkthdr.csum_flags & checksum_request_flags) != 0) { error = bridge_offload_checksum(&scan, &info, &stats); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_CHECKSUM, "%s bridge_offload_checksum failed %d", bridge_ifp->if_xname, error); if (scan != NULL) { m_freem(scan); scan = NULL; } in_errors++; continue; } } mblist_append(&in_list, scan); } done: if (in_list.head != NULL) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_INPUT, "%s packets %d bytes %d", bridge_ifp->if_xname, in_list.count, in_list.bytes); /* Mark the packets as arriving on the bridge interface */ inject_input_packet_list(bridge_ifp, in_list.head, false); ifnet_stat_increment_in(bridge_ifp, in_list.count, in_list.bytes, in_errors); } else if (in_errors != 0) { ifnet_stat_increment_in(bridge_ifp, 0, 0, in_errors); } return; } /* * bridge_broadcast: * * Send a frame to all interfaces that are members of * the bridge, except for the one on which the packet * arrived. * * NOTE: Releases the lock on return. */ static void bridge_broadcast(struct bridge_softc *sc, struct bridge_iflist * sbif, ether_type_flag_t etypef, mbuf_t m) { ifnet_t bridge_ifp; struct bridge_iflist *dbif; struct ifnet * src_if; mbuf_ref_t mc; struct mbuf *mc_in; int error = 0, used = 0; ChecksumOperation cksum_op; struct mac_nat_record mnr; struct bridge_iflist *mac_nat_bif = sc->sc_mac_nat_bif; boolean_t translate_mac = FALSE; uint32_t sc_filter_flags; bool is_bcast_mcast; bridge_ifp = sc->sc_ifp; if (sbif != NULL) { src_if = sbif->bif_ifp; cksum_op = CHECKSUM_OPERATION_CLEAR_OFFLOAD; if (mac_nat_bif != NULL && sbif != mac_nat_bif) { /* get the translation record */ translate_mac = bridge_mac_nat_output(sc, sbif, &m, &mnr); if (m == NULL) { /* packet was deallocated */ BRIDGE_UNLOCK(sc); return; } } } else { /* * sbif is NULL when the bridge interface calls * bridge_broadcast(). */ cksum_op = CHECKSUM_OPERATION_FINALIZE; src_if = NULL; } BRIDGE_LOCK2REF(sc, error); if (error) { m_freem(m); return; } is_bcast_mcast = IS_BCAST_MCAST(m); sc_filter_flags = sc->sc_filter_flags; TAILQ_FOREACH(dbif, &sc->sc_iflist, bif_next) { ifnet_t dst_if; dst_if = dbif->bif_ifp; if (dst_if == src_if) { /* skip the interface that the packet came in on */ continue; } /* Private segments can not talk to each other */ if (sbif != NULL && (sbif->bif_ifflags & dbif->bif_ifflags & IFBIF_PRIVATE)) { continue; } if ((dbif->bif_ifflags & IFBIF_STP) && dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { continue; } if ((dbif->bif_ifflags & IFBIF_DISCOVER) == 0 && !is_bcast_mcast) { continue; } if ((dst_if->if_flags & IFF_RUNNING) == 0) { continue; } if ((dbif->bif_flags & BIFF_MEDIA_ACTIVE) == 0) { continue; } if (TAILQ_NEXT(dbif, bif_next) == NULL) { mc = m; used = 1; } else { mc = m_dup(m, M_DONTWAIT); if (mc == NULL) { (void) ifnet_stat_increment_out(bridge_ifp, 0, 0, 1); continue; } } /* * If broadcast input is enabled, do so only if this * is an input packet. */ if (sbif != NULL && is_bcast_mcast && (dbif->bif_flags & BIFF_INPUT_BROADCAST) != 0) { mc_in = m_dup(mc, M_DONTWAIT); /* this could fail, but we continue anyways */ } else { mc_in = NULL; } /* out */ if (translate_mac && mac_nat_bif == dbif) { /* translate the packet */ bridge_mac_nat_translate(&mc, &mnr, IF_LLADDR(dst_if)); } if (mc != NULL && sbif != NULL && PF_IS_ENABLED && (sc_filter_flags & IFBF_FILT_MEMBER)) { if (used == 0) { /* Keep the layer3 header aligned */ int i = min(mc->m_pkthdr.len, max_protohdr); mc = m_copyup(mc, i, ETHER_ALIGN); if (mc == NULL) { (void) ifnet_stat_increment_out( sc->sc_ifp, 0, 0, 1); if (mc_in != NULL) { m_freem(mc_in); mc_in = NULL; } continue; } } if (bridge_pf(&mc, dst_if, sc_filter_flags, false) != 0) { if (mc_in != NULL) { m_freem(mc_in); mc_in = NULL; } continue; } if (mc == NULL) { if (mc_in != NULL) { m_freem(mc_in); mc_in = NULL; } continue; } } if (mc != NULL) { /* verify checksum if necessary */ if (bif_has_checksum_offload(dbif) && sbif != NULL && !bif_has_checksum_offload(sbif)) { error = bridge_verify_checksum(&mc, &dbif->bif_stats); if (error != 0) { if (mc != NULL) { m_freem(mc); } mc = NULL; } } if (mc != NULL) { (void) bridge_enqueue(bridge_ifp, NULL, dst_if, etypef, mc, cksum_op, pkt_direction_TX); } } /* in */ if (mc_in == NULL) { continue; } BRIDGE_BPF_TAP_IN(dst_if, mc_in); prepare_input_packet(dst_if, mc_in); mc_in->m_flags |= M_PROTO1; /* set to avoid loops */ dlil_input_packet_list(dst_if, mc_in); } if (used == 0) { m_freem(m); } BRIDGE_UNREF(sc); } static mbuf_t copy_packet_list(mbuf_t m) { mblist ret; mbuf_t next_packet; mblist_init(&ret); for (mbuf_t scan = m; scan != NULL; scan = next_packet) { mbuf_t copy_m; /* take it out of the list */ next_packet = scan->m_nextpkt; scan->m_nextpkt = NULL; /* create a copy and add it to the new list */ copy_m = m_dup(scan, M_DONTWAIT); if (copy_m != NULL) { mblist_append(&ret, copy_m); } /* put it back in the original list */ scan->m_nextpkt = next_packet; } return ret.head; } /* * bridge_broadcast_list: * * Broadcast a list of packets to all members except `sbif`. * Consumes `m` before returning. * * NOTE: Releases the lock on return. */ static void bridge_broadcast_list(struct bridge_softc *sc, struct bridge_iflist * sbif, ether_type_flag_t etypef, mbuf_t m, pkt_direction_t direction) { ifnet_t bridge_ifp; bool bridge_needs_input; struct bridge_iflist * dbif; bool is_bcast_mcast; errno_t error = 0; ChecksumOperation cksum_op; struct bridge_iflist * mac_nat_bif = sc->sc_mac_nat_bif; ifnet_t mac_nat_if = NULL; bool need_mac_nat = false; mbuf_t out_mac_nat = NULL; ifnet_t src_if; uint32_t sc_filter_flags; bool used = false; bridge_ifp = sc->sc_ifp; if (sbif != NULL) { src_if = sbif->bif_ifp; if (ether_type_flag_is_ip(etypef) && bif_uses_virtio(sbif)) { bool is_ipv4 = (etypef == ETHER_TYPE_FLAG_IPV4); /* compute checksum on packets marked with offload */ m = bridge_checksum_offload_list(bridge_ifp, sbif, m, is_ipv4); if (m == NULL) { BRIDGE_UNLOCK(sc); goto done; } cksum_op = CHECKSUM_OPERATION_NONE; } else { cksum_op = CHECKSUM_OPERATION_CLEAR_OFFLOAD; } /* * If MAC-NAT is enabled and we'll be sending the packets * over it, verify that it is up and active before * deciding to make a translated copy. */ if (mac_nat_bif != NULL && sbif != mac_nat_bif) { mac_nat_if = mac_nat_bif->bif_ifp; if ((mac_nat_if->if_flags & IFF_RUNNING) != 0 && (mac_nat_bif->bif_flags & BIFF_MEDIA_ACTIVE) != 0) { need_mac_nat = true; } } } else { /* * sbif is NULL when the bridge interface calls * bridge_broadcast_list() (TBD). */ cksum_op = CHECKSUM_OPERATION_FINALIZE; src_if = NULL; } /* * Create a translated copy for packets destined to MAC-NAT interface. */ if (need_mac_nat) { out_mac_nat = bridge_mac_nat_copy_and_translate_list(sc, sbif, mac_nat_if, m); } sc_filter_flags = sc->sc_filter_flags; bridge_needs_input = (sc->sc_flags & SCF_PROTO_ATTACHED) != 0; BRIDGE_LOCK2REF(sc, error); if (error) { goto done; } is_bcast_mcast = IS_BCAST_MCAST(m); /* make a copy for the bridge interface */ if (sbif != NULL && is_bcast_mcast && bridge_needs_input) { mbuf_t in_list; in_list = copy_packet_list(m); BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MCAST, "%s mcast for us in_m %p", bridge_ifp->if_xname, in_list); if (in_list != NULL) { inject_input_packet_list(bridge_ifp, in_list, false); } } TAILQ_FOREACH(dbif, &sc->sc_iflist, bif_next) { ifnet_t dst_if; mbuf_t in_m = NULL; mbuf_t out_m = NULL; dst_if = dbif->bif_ifp; if (dst_if == src_if) { /* skip the interface that the packet came in on */ continue; } /* Private segments can not talk to each other */ if (sbif != NULL && (sbif->bif_ifflags & dbif->bif_ifflags & IFBIF_PRIVATE)) { continue; } if ((dbif->bif_ifflags & IFBIF_STP) && dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { continue; } if ((dbif->bif_ifflags & IFBIF_DISCOVER) == 0 && !is_bcast_mcast) { continue; } if ((dst_if->if_flags & IFF_RUNNING) == 0) { continue; } if ((dbif->bif_flags & BIFF_MEDIA_ACTIVE) == 0) { continue; } if (dbif == mac_nat_bif) { /* translated copy was created above, use that */ out_m = out_mac_nat; out_mac_nat = NULL; } else if (TAILQ_NEXT(dbif, bif_next) == NULL) { /* consume `m` */ out_m = m; used = true; } else { /* needs a copy */ out_m = copy_packet_list(m); } if (out_m == NULL) { ifnet_stat_increment_out(bridge_ifp, 0, 0, 1); continue; } /* * If broadcast input is enabled, do so only if this * is an input packet. */ if (sbif != NULL && is_bcast_mcast && (dbif->bif_flags & BIFF_INPUT_BROADCAST) != 0) { in_m = copy_packet_list(m); /* this could fail, but we continue anyways */ } else { in_m = NULL; } if (sbif != NULL && PF_IS_ENABLED && (sc_filter_flags & IFBF_FILT_MEMBER)) { out_m = bridge_pf_list_out(out_m, dst_if, sc_filter_flags); } if (out_m != NULL) { /* verify checksum if necessary */ if (sbif != NULL && ether_type_flag_is_ip(etypef) && bif_has_checksum_offload(dbif) && !bif_has_checksum_offload(sbif)) { bool is_ipv4 = (etypef == ETHER_TYPE_FLAG_IPV4); out_m = bridge_verify_checksum_list(bridge_ifp, dbif, out_m, is_ipv4); } if (out_m != NULL) { bridge_enqueue(bridge_ifp, src_if, dst_if, etypef, out_m, cksum_op, direction); } } /* in */ if (in_m != NULL) { inject_input_packet_list(dst_if, in_m, true); } } BRIDGE_UNREF(sc); done: if (out_mac_nat != NULL) { m_freem_list(out_mac_nat); } if (!used) { m_freem_list(m); } return; } #define NEEDED_CSUM_IPV4 (IF_HWASSIST_CSUM_UDP | IF_HWASSIST_CSUM_TCP) #define NEEDED_CSUM_IPV6 (IF_HWASSIST_CSUM_UDPIPV6 | IF_HWASSIST_CSUM_TCPIPV6) static bool interface_supports_hw_checksum(ifnet_t ifp, bool is_ipv4) { uint32_t hwcap = IF_HWASSIST_CSUM_FLAGS(ifp->if_hwassist); uint32_t needed = is_ipv4 ? NEEDED_CSUM_IPV4 : NEEDED_CSUM_IPV6; bool supports; supports = (hwcap & needed) == needed; BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "%s: does %ssupport checksum", ifp->if_xname, supports ? "" : "not "); return supports; } static void bridge_forward_list(struct bridge_softc *sc, struct bridge_iflist * sbif, ifnet_t dst_if, ether_type_flag_t etypef, mbuf_t m) { bool checksum_ok = false; ChecksumOperation cksum_op; ifnet_t bridge_ifp = NULL; struct bridge_iflist * dbif; uint32_t sc_filter_flags; ifnet_t src_if; drop_reason_t drop_reason = DROP_REASON_BRIDGE_UNSPECIFIED; if ((dst_if->if_flags & IFF_RUNNING) == 0) { drop_reason = DROP_REASON_BRIDGE_NOT_RUNNING; goto drop; } dbif = bridge_lookup_member_if(sc, dst_if); if (dbif == NULL) { /* Not a member of the bridge (anymore?) */ drop_reason = DROP_REASON_BRIDGE_NOT_A_MEMBER; goto drop; } /* Private segments can not talk to each other */ if ((sbif->bif_ifflags & dbif->bif_ifflags & IFBIF_PRIVATE) != 0) { drop_reason = DROP_REASON_BRIDGE_PRIVATE_SEGMENT; goto drop; } bridge_ifp = sc->sc_ifp; src_if = sbif->bif_ifp; cksum_op = CHECKSUM_OPERATION_CLEAR_OFFLOAD; if (ether_type_flag_is_ip(etypef) && bif_uses_virtio(sbif)) { bool is_ipv4 = (etypef == ETHER_TYPE_FLAG_IPV4); if (dbif == sc->sc_mac_nat_bif || (IFNET_IS_VMNET(dst_if) && !bif_uses_virtio(dbif)) || !interface_supports_hw_checksum(dst_if, is_ipv4)) { /* compute checksums now if necessary */ m = bridge_checksum_offload_list(bridge_ifp, sbif, m, is_ipv4); checksum_ok = true; } else { cksum_op = CHECKSUM_OPERATION_NONE; } } if (dbif == sc->sc_mac_nat_bif) { /* translate the packets before forwarding them */ if ((etypef & ETHER_TYPE_FLAG_IP_ARP) != 0) { m = bridge_mac_nat_translate_list(sc, sbif, dst_if, m); } } else if (!checksum_ok && ether_type_flag_is_ip(etypef) && bif_has_checksum_offload(dbif) && !bif_has_checksum_offload(sbif)) { bool is_ipv4 = (etypef == ETHER_TYPE_FLAG_IPV4); /* * If the destination interface has checksum offload enabled, * verify the checksum now, unless the source interface also has * checksum offload enabled. The checksum in that case has * already just been computed and verifying it is unnecessary. */ m = bridge_verify_checksum_list(bridge_ifp, dbif, m, is_ipv4); } sc_filter_flags = sc->sc_filter_flags; BRIDGE_UNLOCK(sc); if (PF_IS_ENABLED && (sc_filter_flags & IFBF_FILT_MEMBER)) { m = bridge_pf_list_out(m, dst_if, sc_filter_flags); } /* * We're forwarding inbound packets for which the checksums must * already have been computed and if required, verified, or * packets from a virtio-enabled interface for which we rely * on the packet containing appropriate offload flags. */ if (m != NULL) { bridge_enqueue(bridge_ifp, src_if, dst_if, etypef, m, cksum_op, pkt_direction_RX); } return; drop: BRIDGE_UNLOCK(sc); m_drop_list(m, bridge_ifp, DROPTAP_FLAG_DIR_IN, drop_reason, NULL, 0); return; } /* * bridge_span: * * Duplicate a packet out one or more interfaces that are in span mode, * the original mbuf is unmodified. */ static void bridge_span(struct bridge_softc *sc, ether_type_flag_t etypef, struct mbuf *m) { struct bridge_iflist *bif; struct ifnet *dst_if; struct mbuf *mc; if (TAILQ_EMPTY(&sc->sc_spanlist)) { return; } TAILQ_FOREACH(bif, &sc->sc_spanlist, bif_next) { dst_if = bif->bif_ifp; if ((dst_if->if_flags & IFF_RUNNING) == 0) { continue; } mc = m_copypacket(m, M_DONTWAIT); if (mc == NULL) { (void) ifnet_stat_increment_out(sc->sc_ifp, 0, 0, 1); continue; } (void) bridge_enqueue(sc->sc_ifp, NULL, dst_if, etypef, mc, CHECKSUM_OPERATION_NONE, pkt_direction_TX); } } /* * bridge_rtupdate: * * Add a bridge routing entry. */ static int bridge_rtupdate(struct bridge_softc *sc, const uint8_t dst[ETHER_ADDR_LEN], uint16_t vlan, struct bridge_iflist *bif, int setflags, uint8_t flags) { struct bridge_rtnode *brt; int error; BRIDGE_LOCK_ASSERT_HELD(sc); /* Check the source address is valid and not multicast. */ if (ETHER_IS_MULTICAST(dst) || (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) { return EINVAL; } /* 802.1p frames map to vlan 1 */ if (vlan == 0) { vlan = 1; } /* * A route for this destination might already exist. If so, * update it, otherwise create a new one. */ if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { if (sc->sc_brtcnt >= sc->sc_brtmax) { sc->sc_brtexceeded++; return ENOSPC; } /* Check per interface address limits (if enabled) */ if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { bif->bif_addrexceeded++; return ENOSPC; } /* * Allocate a new bridge forwarding node, and * initialize the expiration time and Ethernet * address. */ brt = zalloc_noblock(bridge_rtnode_pool); if (brt == NULL) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_RT_TABLE, "zalloc_nolock failed"); return ENOMEM; } bzero(brt, sizeof(struct bridge_rtnode)); if (bif->bif_ifflags & IFBIF_STICKY) { brt->brt_flags = IFBAF_STICKY; } else { brt->brt_flags = IFBAF_DYNAMIC; } memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); brt->brt_vlan = vlan; if ((error = bridge_rtnode_insert(sc, brt)) != 0) { zfree(bridge_rtnode_pool, brt); return error; } brt->brt_dst = bif; bif->bif_addrcnt++; BRIDGE_LOG(LOG_DEBUG, BR_DBGF_RT_TABLE, "added %02x:%02x:%02x:%02x:%02x:%02x " "on %s count %u hashsize %u", dst[0], dst[1], dst[2], dst[3], dst[4], dst[5], sc->sc_ifp->if_xname, sc->sc_brtcnt, sc->sc_rthash_size); } if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && brt->brt_dst != bif) { brt->brt_dst->bif_addrcnt--; brt->brt_dst = bif; brt->brt_dst->bif_addrcnt++; } if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { unsigned long now; now = (unsigned long) net_uptime(); brt->brt_expire = now + sc->sc_brttimeout; } if (setflags) { brt->brt_flags = flags; } return 0; } /* * bridge_rtlookup: * * Lookup the destination interface for an address. */ static struct bridge_iflist * bridge_rtlookup_bif(struct bridge_softc *sc, const uint8_t addr[ETHER_ADDR_LEN], uint16_t vlan) { struct bridge_rtnode *brt; BRIDGE_LOCK_ASSERT_HELD(sc); if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) { return NULL; } return brt->brt_dst; } /* * bridge_rttrim: * * Trim the routine table so that we have a number * of routing entries less than or equal to the * maximum number. */ static void bridge_rttrim(struct bridge_softc *sc) { struct bridge_rtnode *brt, *nbrt; BRIDGE_LOCK_ASSERT_HELD(sc); /* Make sure we actually need to do this. */ if (sc->sc_brtcnt <= sc->sc_brtmax) { return; } /* Force an aging cycle; this might trim enough addresses. */ bridge_rtage(sc); if (sc->sc_brtcnt <= sc->sc_brtmax) { return; } LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { bridge_rtnode_destroy(sc, brt); if (sc->sc_brtcnt <= sc->sc_brtmax) { return; } } } } /* * bridge_aging_timer: * * Aging periodic timer for the bridge routing table. */ static void bridge_aging_timer(struct bridge_softc *sc) { BRIDGE_LOCK_ASSERT_HELD(sc); bridge_rtage(sc); if ((sc->sc_ifp->if_flags & IFF_RUNNING) && (sc->sc_flags & SCF_DETACHING) == 0) { sc->sc_aging_timer.bdc_sc = sc; sc->sc_aging_timer.bdc_func = bridge_aging_timer; sc->sc_aging_timer.bdc_ts.tv_sec = bridge_rtable_prune_period; bridge_schedule_delayed_call(&sc->sc_aging_timer); } } /* * bridge_rtage: * * Perform an aging cycle. */ static void bridge_rtage(struct bridge_softc *sc) { struct bridge_rtnode *brt, *nbrt; unsigned long now; BRIDGE_LOCK_ASSERT_HELD(sc); now = (unsigned long) net_uptime(); LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { if (now >= brt->brt_expire) { bridge_rtnode_destroy(sc, brt); } } } if (sc->sc_mac_nat_bif != NULL) { bridge_mac_nat_age_entries(sc, now); } } /* * bridge_rtflush: * * Remove all dynamic addresses from the bridge. */ static void bridge_rtflush(struct bridge_softc *sc, int full) { struct bridge_rtnode *brt, *nbrt; BRIDGE_LOCK_ASSERT_HELD(sc); LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { bridge_rtnode_destroy(sc, brt); } } } /* * bridge_rtdaddr: * * Remove an address from the table. */ static int bridge_rtdaddr(struct bridge_softc *sc, const uint8_t addr[ETHER_ADDR_LEN], uint16_t vlan) { struct bridge_rtnode *brt; int found = 0; BRIDGE_LOCK_ASSERT_HELD(sc); /* * If vlan is zero then we want to delete for all vlans so the lookup * may return more than one. */ while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { bridge_rtnode_destroy(sc, brt); found = 1; } return found ? 0 : ENOENT; } /* * bridge_rtdelete: * * Delete routes to a specific member interface. */ static void bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) { struct bridge_rtnode *brt, *nbrt; BRIDGE_LOCK_ASSERT_HELD(sc); LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { if (brt->brt_ifp == ifp && (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) { bridge_rtnode_destroy(sc, brt); } } } /* * bridge_rtable_init: * * Initialize the route table for this bridge. */ static int bridge_rtable_init(struct bridge_softc *sc) { u_int32_t i; sc->sc_rthash = kalloc_type(struct _bridge_rtnode_list, BRIDGE_RTHASH_SIZE, Z_WAITOK_ZERO_NOFAIL); sc->sc_rthash_size = BRIDGE_RTHASH_SIZE; for (i = 0; i < sc->sc_rthash_size; i++) { LIST_INIT(&sc->sc_rthash[i]); } sc->sc_rthash_key = RandomULong(); LIST_INIT(&sc->sc_rtlist); return 0; } /* * bridge_rthash_delayed_resize: * * Resize the routing table hash on a delayed thread call. */ static void bridge_rthash_delayed_resize(struct bridge_softc *sc) { u_int32_t new_rthash_size = 0; u_int32_t old_rthash_size = 0; struct _bridge_rtnode_list *new_rthash = NULL; struct _bridge_rtnode_list *old_rthash = NULL; u_int32_t i; struct bridge_rtnode *brt; int error = 0; BRIDGE_LOCK_ASSERT_HELD(sc); /* * Four entries per hash bucket is our ideal load factor */ if (sc->sc_brtcnt < sc->sc_rthash_size * 4) { goto out; } /* * Doubling the number of hash buckets may be too simplistic * especially when facing a spike of new entries */ new_rthash_size = sc->sc_rthash_size * 2; sc->sc_flags |= SCF_RESIZING; BRIDGE_UNLOCK(sc); new_rthash = kalloc_type(struct _bridge_rtnode_list, new_rthash_size, Z_WAITOK | Z_ZERO); BRIDGE_LOCK(sc); sc->sc_flags &= ~SCF_RESIZING; if (new_rthash == NULL) { error = ENOMEM; goto out; } if ((sc->sc_flags & SCF_DETACHING)) { error = ENODEV; goto out; } /* * Fail safe from here on */ old_rthash = sc->sc_rthash; old_rthash_size = sc->sc_rthash_size; sc->sc_rthash = new_rthash; sc->sc_rthash_size = new_rthash_size; /* * Get a new key to force entries to be shuffled around to reduce * the likelihood they will land in the same buckets */ sc->sc_rthash_key = RandomULong(); for (i = 0; i < sc->sc_rthash_size; i++) { LIST_INIT(&sc->sc_rthash[i]); } LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { LIST_REMOVE(brt, brt_hash); (void) bridge_rtnode_hash(sc, brt); } out: if (error == 0) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_RT_TABLE, "%s new size %u", sc->sc_ifp->if_xname, sc->sc_rthash_size); kfree_type(struct _bridge_rtnode_list, old_rthash_size, old_rthash); } else { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_RT_TABLE, "%s failed %d", sc->sc_ifp->if_xname, error); kfree_type(struct _bridge_rtnode_list, new_rthash_size, new_rthash); } } /* * Resize the number of hash buckets based on the load factor * Currently only grow * Failing to resize the hash table is not fatal */ static void bridge_rthash_resize(struct bridge_softc *sc) { BRIDGE_LOCK_ASSERT_HELD(sc); if ((sc->sc_flags & SCF_DETACHING) || (sc->sc_flags & SCF_RESIZING)) { return; } /* * Four entries per hash bucket is our ideal load factor */ if (sc->sc_brtcnt < sc->sc_rthash_size * 4) { return; } /* * Hard limit on the size of the routing hash table */ if (sc->sc_rthash_size >= bridge_rtable_hash_size_max) { return; } sc->sc_resize_call.bdc_sc = sc; sc->sc_resize_call.bdc_func = bridge_rthash_delayed_resize; bridge_schedule_delayed_call(&sc->sc_resize_call); } /* * bridge_rtable_fini: * * Deconstruct the route table for this bridge. */ static void bridge_rtable_fini(struct bridge_softc *sc) { KASSERT(sc->sc_brtcnt == 0, ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); kfree_type_counted_by(struct _bridge_rtnode_list, sc->sc_rthash_size, sc->sc_rthash); sc->sc_rthash = NULL; sc->sc_rthash_size = 0; } /* * The following hash function is adapted from "Hash Functions" by Bob Jenkins * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). */ #define mix(a, b, c) \ do { \ a -= b; a -= c; a ^= (c >> 13); \ b -= c; b -= a; b ^= (a << 8); \ c -= a; c -= b; c ^= (b >> 13); \ a -= b; a -= c; a ^= (c >> 12); \ b -= c; b -= a; b ^= (a << 16); \ c -= a; c -= b; c ^= (b >> 5); \ a -= b; a -= c; a ^= (c >> 3); \ b -= c; b -= a; b ^= (a << 10); \ c -= a; c -= b; c ^= (b >> 15); \ } while ( /*CONSTCOND*/ 0) static __inline uint32_t bridge_rthash(struct bridge_softc *sc, const uint8_t addr[ETHER_ADDR_LEN]) { uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; b += addr[5] << 8; b += addr[4]; a += addr[3] << 24; a += addr[2] << 16; a += addr[1] << 8; a += addr[0]; mix(a, b, c); return c & BRIDGE_RTHASH_MASK(sc); } #undef mix static int bridge_rtnode_addr_cmp(const uint8_t a[ETHER_ADDR_LEN], const uint8_t b[ETHER_ADDR_LEN]) { int i, d; for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { d = ((int)a[i]) - ((int)b[i]); } return d; } /* * bridge_rtnode_lookup: * * Look up a bridge route node for the specified destination. Compare the * vlan id or if zero then just return the first match. */ static struct bridge_rtnode * bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t addr[ETHER_ADDR_LEN], uint16_t vlan) { struct bridge_rtnode *brt; uint32_t hash; int dir; BRIDGE_LOCK_ASSERT_HELD(sc); hash = bridge_rthash(sc, addr); LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) { return brt; } if (dir > 0) { return NULL; } } return NULL; } /* * bridge_rtnode_hash: * * Insert the specified bridge node into the route hash table. * This is used when adding a new node or to rehash when resizing * the hash table */ static int bridge_rtnode_hash(struct bridge_softc *sc, struct bridge_rtnode *brt) { struct bridge_rtnode *lbrt; uint32_t hash; int dir; BRIDGE_LOCK_ASSERT_HELD(sc); hash = bridge_rthash(sc, brt->brt_addr); lbrt = LIST_FIRST(&sc->sc_rthash[hash]); if (lbrt == NULL) { LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); goto out; } do { dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_RT_TABLE, "%s EEXIST %02x:%02x:%02x:%02x:%02x:%02x", sc->sc_ifp->if_xname, brt->brt_addr[0], brt->brt_addr[1], brt->brt_addr[2], brt->brt_addr[3], brt->brt_addr[4], brt->brt_addr[5]); return EEXIST; } if (dir > 0) { LIST_INSERT_BEFORE(lbrt, brt, brt_hash); goto out; } if (LIST_NEXT(lbrt, brt_hash) == NULL) { LIST_INSERT_AFTER(lbrt, brt, brt_hash); goto out; } lbrt = LIST_NEXT(lbrt, brt_hash); } while (lbrt != NULL); BRIDGE_LOG(LOG_DEBUG, BR_DBGF_RT_TABLE, "%s impossible %02x:%02x:%02x:%02x:%02x:%02x", sc->sc_ifp->if_xname, brt->brt_addr[0], brt->brt_addr[1], brt->brt_addr[2], brt->brt_addr[3], brt->brt_addr[4], brt->brt_addr[5]); out: return 0; } /* * bridge_rtnode_insert: * * Insert the specified bridge node into the route table. We * assume the entry is not already in the table. */ static int bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) { int error; error = bridge_rtnode_hash(sc, brt); if (error != 0) { return error; } LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); sc->sc_brtcnt++; bridge_rthash_resize(sc); return 0; } /* * bridge_rtnode_destroy: * * Destroy a bridge rtnode. */ static void bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) { BRIDGE_LOCK_ASSERT_HELD(sc); LIST_REMOVE(brt, brt_hash); LIST_REMOVE(brt, brt_list); sc->sc_brtcnt--; brt->brt_dst->bif_addrcnt--; zfree(bridge_rtnode_pool, brt); } #if BRIDGESTP /* * bridge_rtable_expire: * * Set the expiry time for all routes on an interface. */ static void bridge_rtable_expire(struct ifnet *ifp, int age) { struct bridge_softc *sc = ifp->if_bridge; struct bridge_rtnode *brt; BRIDGE_LOCK(sc); /* * If the age is zero then flush, otherwise set all the expiry times to * age for the interface */ if (age == 0) { bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); } else { unsigned long now; now = (unsigned long) net_uptime(); LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { /* Cap the expiry time to 'age' */ if (brt->brt_ifp == ifp && brt->brt_expire > now + age && (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { brt->brt_expire = now + age; } } } BRIDGE_UNLOCK(sc); } /* * bridge_state_change: * * Callback from the bridgestp code when a port changes states. */ static void bridge_state_change(struct ifnet *ifp, int state) { struct bridge_softc *sc = ifp->if_bridge; static const char *stpstates[] = { "disabled", "listening", "learning", "forwarding", "blocking", "discarding" }; if (log_stp) { log(LOG_NOTICE, "%s: state changed to %s on %s", sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); } } #endif /* BRIDGESTP */ /* * bridge_detach: * * Callback when interface has been detached. */ static void bridge_detach(ifnet_t ifp) { struct bridge_softc *sc = (struct bridge_softc *)ifnet_softc(ifp); #if BRIDGESTP bstp_detach(&sc->sc_stp); #endif /* BRIDGESTP */ /* Tear down the routing table. */ bridge_rtable_fini(sc); lck_mtx_lock(&bridge_list_mtx); LIST_REMOVE(sc, sc_list); lck_mtx_unlock(&bridge_list_mtx); ifnet_release(ifp); lck_mtx_destroy(&sc->sc_mtx, &bridge_lock_grp); kfree_type(struct bridge_softc, sc); } /* * bridge_link_event: * * Report a data link event on an interface */ static void bridge_link_event(struct ifnet *ifp, u_int32_t event_code) { struct event { u_int32_t ifnet_family; u_int32_t unit; char if_name[IFNAMSIZ]; }; _Alignas(struct kern_event_msg) char message[sizeof(struct kern_event_msg) + sizeof(struct event)] = { 0 }; struct kern_event_msg *header = (struct kern_event_msg*)message; struct event *data = (struct event *)(message + KEV_MSG_HEADER_SIZE); BRIDGE_LOG(LOG_DEBUG, BR_DBGF_LIFECYCLE, "%s event_code %u - %s", ifp->if_xname, event_code, dlil_kev_dl_code_str(event_code)); header->total_size = sizeof(message); header->vendor_code = KEV_VENDOR_APPLE; header->kev_class = KEV_NETWORK_CLASS; header->kev_subclass = KEV_DL_SUBCLASS; header->event_code = event_code; data->ifnet_family = ifnet_family(ifp); data->unit = (u_int32_t)ifnet_unit(ifp); strlcpy(data->if_name, ifnet_name(ifp), IFNAMSIZ); ifnet_event(ifp, header); } #define BRIDGE_HF_DROP(reason, func, line) { \ bridge_hostfilter_stats.reason++; \ BRIDGE_LOG(LOG_DEBUG, BR_DBGF_HOSTFILTER, \ "%s.%d" #reason, func, line); \ error = EINVAL; \ } static int bridge_host_filter_arp(struct bridge_iflist *bif, mbuf_t *data) { struct ether_arp *ea; struct ether_header *eh; int error = EINVAL; mbuf_t m = *data; size_t minlen = sizeof(struct ether_header) + sizeof(struct ether_arp); /* * Make the Ethernet and ARP headers contiguous */ if (mbuf_pkthdr_len(m) < minlen) { BRIDGE_HF_DROP(brhf_arp_too_small, __func__, __LINE__); goto done; } if (mbuf_len(m) < minlen && mbuf_pullup(data, minlen) != 0) { BRIDGE_HF_DROP(brhf_arp_pullup_failed, __func__, __LINE__); goto done; } m = *data; /* * Restrict Ethernet protocols to ARP and IP/IPv6 */ eh = mtod(m, struct ether_header *); ea = (struct ether_arp *)(eh + 1); if (ea->arp_hrd != HTONS_ARPHRD_ETHER) { BRIDGE_HF_DROP(brhf_arp_bad_hw_type, __func__, __LINE__); goto done; } if (ea->arp_pro != HTONS_ETHERTYPE_IP) { BRIDGE_HF_DROP(brhf_arp_bad_pro_type, __func__, __LINE__); goto done; } /* * Verify the address lengths are correct */ if (ea->arp_hln != ETHER_ADDR_LEN) { BRIDGE_HF_DROP(brhf_arp_bad_hw_len, __func__, __LINE__); goto done; } if (ea->arp_pln != sizeof(struct in_addr)) { BRIDGE_HF_DROP(brhf_arp_bad_pro_len, __func__, __LINE__); goto done; } /* * Allow only ARP request or ARP reply */ if (ea->arp_op != HTONS_ARPOP_REQUEST && ea->arp_op != HTONS_ARPOP_REPLY) { BRIDGE_HF_DROP(brhf_arp_bad_op, __func__, __LINE__); goto done; } if ((bif->bif_flags & BIFF_HF_HWSRC) != 0) { /* * Verify source hardware address matches */ if (bcmp(ea->arp_sha, bif->bif_hf_hwsrc, ETHER_ADDR_LEN) != 0) { BRIDGE_HF_DROP(brhf_arp_bad_sha, __func__, __LINE__); goto done; } } if ((bif->bif_flags & BIFF_HF_IPSRC) != 0) { /* * Verify source protocol address: * May be null for an ARP probe */ if (bcmp(ea->arp_spa, &bif->bif_hf_ipsrc.s_addr, sizeof(struct in_addr)) != 0 && bcmp(ea->arp_spa, &inaddr_any, sizeof(struct in_addr)) != 0) { BRIDGE_HF_DROP(brhf_arp_bad_spa, __func__, __LINE__); goto done; } } bridge_hostfilter_stats.brhf_arp_ok += 1; error = 0; done: return error; } /* * MAC NAT */ static errno_t bridge_mac_nat_enable(struct bridge_softc *sc, struct bridge_iflist *bif) { errno_t error = 0; BRIDGE_LOCK_ASSERT_HELD(sc); if (IFNET_IS_VMNET(bif->bif_ifp)) { error = EINVAL; goto done; } if (sc->sc_mac_nat_bif != NULL) { if (sc->sc_mac_nat_bif != bif) { error = EBUSY; } goto done; } sc->sc_mac_nat_bif = bif; bif->bif_ifflags |= IFBIF_MAC_NAT; bridge_mac_nat_populate_entries(sc); done: return error; } static void bridge_mac_nat_disable(struct bridge_softc *sc) { struct bridge_iflist *mac_nat_bif = sc->sc_mac_nat_bif; assert(mac_nat_bif != NULL); bridge_mac_nat_flush_entries(sc, mac_nat_bif); mac_nat_bif->bif_ifflags &= ~IFBIF_MAC_NAT; sc->sc_mac_nat_bif = NULL; return; } static void mac_nat_entry_print2(struct mac_nat_entry *mne, const char ifname[IFNAMSIZ], const char *msg1, const char *msg2) { int af; char etopbuf[24]; char ntopbuf[MAX_IPv6_STR_LEN]; const char *space; af = ((mne->mne_flags & MNE_FLAGS_IPV6) != 0) ? AF_INET6 : AF_INET; ether_ntop(etopbuf, sizeof(etopbuf), mne->mne_mac); (void)inet_ntop(af, &mne->mne_u, ntopbuf, sizeof(ntopbuf)); if (msg2 == NULL) { msg2 = ""; space = ""; } else { space = " "; } BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MAC_NAT, "%.*s %s%s%s %p (%s, %s, %s)", IFNAMSIZ, ifname, msg1, space, msg2, mne, mne->mne_bif->bif_ifp->if_xname, ntopbuf, etopbuf); } static void mac_nat_entry_print(struct mac_nat_entry *mne, const char ifname[IFNAMSIZ], const char *msg) { mac_nat_entry_print2(mne, ifname, msg, NULL); } static struct mac_nat_entry * bridge_lookup_mac_nat_entry_ipv4(const struct bridge_softc *sc, const struct in_addr *ip) { struct mac_nat_entry *mne; struct mac_nat_entry *ret_mne = NULL; LIST_FOREACH(mne, &sc->sc_mne_list, mne_list) { if (mne->mne_ip.s_addr == ip->s_addr) { if (BRIDGE_DBGF_ENABLED(BR_DBGF_MAC_NAT)) { mac_nat_entry_print(mne, sc->sc_if_xname, "found"); } ret_mne = mne; break; } } return ret_mne; } static struct mac_nat_entry * bridge_lookup_mac_nat_entry_ipv6(const struct bridge_softc *sc, const struct in6_addr *ip6) { struct mac_nat_entry *mne; struct mac_nat_entry *ret_mne = NULL; LIST_FOREACH(mne, &sc->sc_mne_list_v6, mne_list) { if (IN6_ARE_ADDR_EQUAL(&mne->mne_ip6, ip6)) { if (BRIDGE_DBGF_ENABLED(BR_DBGF_MAC_NAT)) { mac_nat_entry_print(mne, sc->sc_if_xname, "found"); } ret_mne = mne; break; } } return ret_mne; } static void bridge_destroy_mac_nat_entry(struct bridge_softc *sc, struct mac_nat_entry *mne, const char *reason) { LIST_REMOVE(mne, mne_list); if (BRIDGE_DBGF_ENABLED(BR_DBGF_MAC_NAT)) { mac_nat_entry_print(mne, sc->sc_if_xname, reason); } zfree(bridge_mne_pool, mne); sc->sc_mne_count--; } static struct mac_nat_entry * bridge_create_mac_nat_entry_common(struct bridge_softc *sc, struct bridge_iflist *bif, const char eaddr[ETHER_ADDR_LEN]) { struct mac_nat_entry *mne; if (sc->sc_mne_count >= sc->sc_mne_max) { sc->sc_mne_allocation_failures++; return NULL; } mne = zalloc_noblock(bridge_mne_pool); if (mne == NULL) { sc->sc_mne_allocation_failures++; return NULL; } sc->sc_mne_count++; bzero(mne, sizeof(*mne)); bcopy(eaddr, mne->mne_mac, sizeof(mne->mne_mac)); mne->mne_bif = bif; mne->mne_expire = (unsigned long)net_uptime() + sc->sc_brttimeout; if (BRIDGE_DBGF_ENABLED(BR_DBGF_MAC_NAT)) { mac_nat_entry_print(mne, sc->sc_if_xname, "created"); } return mne; } static struct mac_nat_entry * bridge_create_mac_nat_entry_ipv4(struct bridge_softc *sc, struct bridge_iflist *bif, const struct in_addr *ip, const char eaddr[ETHER_ADDR_LEN]) { struct mac_nat_entry *mne; mne = bridge_create_mac_nat_entry_common(sc, bif, eaddr); if (mne == NULL) { return NULL; } bcopy(ip, &mne->mne_ip, sizeof(mne->mne_ip)); LIST_INSERT_HEAD(&sc->sc_mne_list, mne, mne_list); return mne; } static struct mac_nat_entry * bridge_create_mac_nat_entry_ipv6(struct bridge_softc *sc, struct bridge_iflist *bif, const struct in6_addr *ip6, const char eaddr[ETHER_ADDR_LEN]) { struct mac_nat_entry *mne; mne = bridge_create_mac_nat_entry_common(sc, bif, eaddr); if (mne == NULL) { return NULL; } bcopy(ip6, &mne->mne_ip6, sizeof(mne->mne_ip6)); mne->mne_flags |= MNE_FLAGS_IPV6; LIST_INSERT_HEAD(&sc->sc_mne_list_v6, mne, mne_list); return mne; } static struct mac_nat_entry * bridge_update_mac_nat_entry_common(struct bridge_softc *sc, struct bridge_iflist *bif, struct mac_nat_entry *mne, const char eaddr[ETHER_ADDR_LEN]) { struct bridge_iflist *mac_nat_bif = sc->sc_mac_nat_bif; if (mne->mne_bif == mac_nat_bif) { /* the MAC NAT interface takes precedence */ if (BRIDGE_DBGF_ENABLED(BR_DBGF_MAC_NAT)) { if (mne->mne_bif != bif) { mac_nat_entry_print2(mne, sc->sc_if_xname, "reject", bif->bif_ifp->if_xname); } } } else if (mne->mne_bif != bif) { const char *__null_terminated old_if = mne->mne_bif->bif_ifp->if_xname; mne->mne_bif = bif; if (BRIDGE_DBGF_ENABLED(BR_DBGF_MAC_NAT)) { mac_nat_entry_print2(mne, sc->sc_if_xname, "replaced", old_if); } bcopy(eaddr, mne->mne_mac, sizeof(mne->mne_mac)); } mne->mne_expire = (unsigned long)net_uptime() + sc->sc_brttimeout; return mne; } static struct mac_nat_entry * bridge_update_mac_nat_entry_ipv4(struct bridge_softc *sc, struct bridge_iflist *bif, struct in_addr *ip, const char eaddr[ETHER_ADDR_LEN]) { struct mac_nat_entry *mne; mne = bridge_lookup_mac_nat_entry_ipv4(sc, ip); if (mne != NULL) { return bridge_update_mac_nat_entry_common(sc, bif, mne, eaddr); } mne = bridge_create_mac_nat_entry_ipv4(sc, bif, ip, eaddr); return mne; } static struct mac_nat_entry * bridge_update_mac_nat_entry_ipv6(struct bridge_softc *sc, struct bridge_iflist *bif, struct in6_addr *ip6, const char eaddr[ETHER_ADDR_LEN]) { struct mac_nat_entry *mne; mne = bridge_lookup_mac_nat_entry_ipv6(sc, ip6); if (mne != NULL) { return bridge_update_mac_nat_entry_common(sc, bif, mne, eaddr); } mne = bridge_create_mac_nat_entry_ipv6(sc, bif, ip6, eaddr); return mne; } static void bridge_mac_nat_flush_entries_common(struct bridge_softc *sc, struct mac_nat_entry_list *list, struct bridge_iflist *bif) { struct mac_nat_entry *mne; struct mac_nat_entry *tmne; LIST_FOREACH_SAFE(mne, list, mne_list, tmne) { if (bif != NULL && mne->mne_bif != bif) { continue; } bridge_destroy_mac_nat_entry(sc, mne, "flushed"); } } /* * bridge_mac_nat_flush_entries: * * Flush MAC NAT entries for the specified member. Flush all entries if * the member is the one that requires MAC NAT, otherwise just flush the * ones for the specified member. */ static void bridge_mac_nat_flush_entries(struct bridge_softc *sc, struct bridge_iflist * bif) { struct bridge_iflist *flush_bif; flush_bif = (bif == sc->sc_mac_nat_bif) ? NULL : bif; bridge_mac_nat_flush_entries_common(sc, &sc->sc_mne_list, flush_bif); bridge_mac_nat_flush_entries_common(sc, &sc->sc_mne_list_v6, flush_bif); } static void bridge_mac_nat_populate_entries(struct bridge_softc *sc) { errno_t error; ifnet_t ifp; uint16_t addresses_count = 0; ifaddr_t * __counted_by(addresses_count) list; struct bridge_iflist *mac_nat_bif = sc->sc_mac_nat_bif; assert(mac_nat_bif != NULL); ifp = mac_nat_bif->bif_ifp; error = ifnet_get_address_list_family_with_count(ifp, &list, &addresses_count, 0); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_MAC_NAT, "ifnet_get_address_list(%s) failed %d", ifp->if_xname, error); return; } for (uint16_t i = 0; i < addresses_count; ++i) { sa_family_t af; af = ifaddr_address_family(list[i]); switch (af) { case AF_INET: { struct sockaddr_in sin; error = ifaddr_address(list[i], (struct sockaddr *)&sin, sizeof(sin)); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_MAC_NAT, "ifaddr_address failed %d", error); break; } bridge_create_mac_nat_entry_ipv4(sc, mac_nat_bif, &sin.sin_addr, IF_LLADDR(ifp)); break; } case AF_INET6: { struct sockaddr_in6 sin6; error = ifaddr_address(list[i], (struct sockaddr *)&sin6, sizeof(sin6)); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_MAC_NAT, "ifaddr_address failed %d", error); break; } if (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) { /* remove scope ID */ sin6.sin6_addr.s6_addr16[1] = 0; } bridge_create_mac_nat_entry_ipv6(sc, mac_nat_bif, &sin6.sin6_addr, IF_LLADDR(ifp)); break; } default: BRIDGE_LOG(LOG_NOTICE, BR_DBGF_MAC_NAT, "ifaddr_address_family unknown %d", af); break; } } ifnet_address_list_free_counted_by(list, addresses_count); return; } static void bridge_mac_nat_age_entries_common(struct bridge_softc *sc, struct mac_nat_entry_list *list, unsigned long now) { struct mac_nat_entry *mne; struct mac_nat_entry *tmne; LIST_FOREACH_SAFE(mne, list, mne_list, tmne) { if (now >= mne->mne_expire) { bridge_destroy_mac_nat_entry(sc, mne, "aged out"); } } } static void bridge_mac_nat_age_entries(struct bridge_softc *sc, unsigned long now) { if (sc->sc_mac_nat_bif == NULL) { return; } bridge_mac_nat_age_entries_common(sc, &sc->sc_mne_list, now); bridge_mac_nat_age_entries_common(sc, &sc->sc_mne_list_v6, now); } static const char * get_in_out_string(boolean_t is_output) { return (const char * __null_terminated)(is_output ? "OUT" : "IN"); } /* * is_valid_arp_packet: * Verify that this is a valid ARP packet. * * Returns TRUE if the packet is valid, FALSE otherwise. */ static boolean_t is_valid_arp_packet(mbuf_t *data, bool is_output, struct ether_header **eh_p, struct ether_arp **ea_p) { struct ether_arp *ea; struct ether_header *eh; size_t minlen = sizeof(struct ether_header) + sizeof(struct ether_arp); boolean_t is_valid = FALSE; int flags = is_output ? BR_DBGF_OUTPUT : BR_DBGF_INPUT; if (mbuf_pkthdr_len(*data) < minlen) { BRIDGE_LOG(LOG_DEBUG, flags, "ARP %s short frame %lu < %lu", get_in_out_string(is_output), mbuf_pkthdr_len(*data), minlen); goto done; } if (mbuf_len(*data) < minlen && mbuf_pullup(data, minlen) != 0) { BRIDGE_LOG(LOG_DEBUG, flags, "ARP %s size %lu mbuf_pullup fail", get_in_out_string(is_output), minlen); *data = NULL; goto done; } /* validate ARP packet */ eh = mtod(*data, struct ether_header *); ea = (struct ether_arp *)(eh + 1); if (ea->arp_hrd != HTONS_ARPHRD_ETHER) { BRIDGE_LOG(LOG_DEBUG, flags, "ARP %s htype not ethernet", get_in_out_string(is_output)); goto done; } if (ea->arp_hln != ETHER_ADDR_LEN) { BRIDGE_LOG(LOG_DEBUG, flags, "ARP %s hlen not ethernet", get_in_out_string(is_output)); goto done; } if (ea->arp_pro != HTONS_ETHERTYPE_IP) { BRIDGE_LOG(LOG_DEBUG, flags, "ARP %s ptype not IP", get_in_out_string(is_output)); goto done; } if (ea->arp_pln != sizeof(struct in_addr)) { BRIDGE_LOG(LOG_DEBUG, flags, "ARP %s plen not IP", get_in_out_string(is_output)); goto done; } is_valid = TRUE; *ea_p = ea; *eh_p = eh; done: return is_valid; } static struct mac_nat_entry * bridge_mac_nat_arp_input(struct bridge_softc *sc, mbuf_t *data) { struct ether_arp * __single ea; struct ether_header * __single eh; struct mac_nat_entry *mne = NULL; u_short op; struct in_addr tpa; if (!is_valid_arp_packet(data, FALSE, &eh, &ea)) { goto done; } op = ea->arp_op; switch (op) { case HTONS_ARPOP_REQUEST: case HTONS_ARPOP_REPLY: /* only care about REQUEST and REPLY */ break; default: goto done; } /* check the target IP address for a NAT entry */ bcopy(ea->arp_tpa, &tpa, sizeof(tpa)); if (tpa.s_addr != 0) { mne = bridge_lookup_mac_nat_entry_ipv4(sc, &tpa); } if (mne != NULL) { if (op == HTONS_ARPOP_REPLY) { /* translate the MAC address */ if (BRIDGE_DBGF_ENABLED(BR_DBGF_MAC_NAT)) { char mac_src[24]; char mac_dst[24]; ether_ntop(mac_src, sizeof(mac_src), ea->arp_tha); ether_ntop(mac_dst, sizeof(mac_dst), mne->mne_mac); BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MAC_NAT, "%s %s ARP %s -> %s", sc->sc_if_xname, mne->mne_bif->bif_ifp->if_xname, mac_src, mac_dst); } bcopy(mne->mne_mac, ea->arp_tha, sizeof(ea->arp_tha)); } } else { /* handle conflicting ARP (sender matches mne) */ struct in_addr spa; bcopy(ea->arp_spa, &spa, sizeof(spa)); if (spa.s_addr != 0 && spa.s_addr != tpa.s_addr) { /* check the source IP for a NAT entry */ mne = bridge_lookup_mac_nat_entry_ipv4(sc, &spa); } } done: return mne; } static boolean_t bridge_mac_nat_arp_output(struct bridge_softc *sc, struct bridge_iflist *bif, mbuf_t *data, struct mac_nat_record *mnr) { struct ether_arp * __single ea; struct ether_header * __single eh; struct in_addr ip; struct mac_nat_entry *mne = NULL; u_short op; boolean_t translate = FALSE; if (!is_valid_arp_packet(data, TRUE, &eh, &ea)) { goto done; } op = ea->arp_op; switch (op) { case HTONS_ARPOP_REQUEST: case HTONS_ARPOP_REPLY: /* only care about REQUEST and REPLY */ break; default: goto done; } bcopy(ea->arp_spa, &ip, sizeof(ip)); if (ip.s_addr == 0) { goto done; } /* XXX validate IP address: no multicast/broadcast */ mne = bridge_update_mac_nat_entry_ipv4(sc, bif, &ip, (const char *)ea->arp_sha); if (mnr != NULL && mne != NULL) { /* record the offset to do the replacement */ translate = TRUE; mnr->mnr_arp_offset = (char *)ea->arp_sha - (char *)eh; } done: return translate; } #define ETHER_IPV4_HEADER_LEN (sizeof(struct ether_header) + \ + sizeof(struct ip)) static uint8_t * __indexable get_ether_ip_header_ptr(mbuf_t *data, boolean_t is_output) { uint8_t *header = NULL; int flags = is_output ? BR_DBGF_OUTPUT : BR_DBGF_INPUT; size_t minlen = ETHER_IPV4_HEADER_LEN; if (mbuf_pkthdr_len(*data) < minlen) { BRIDGE_LOG(LOG_DEBUG, flags, "IP %s short frame %lu < %lu", get_in_out_string(is_output), mbuf_pkthdr_len(*data), minlen); goto done; } if (mbuf_len(*data) < minlen && mbuf_pullup(data, minlen) != 0) { BRIDGE_LOG(LOG_DEBUG, flags, "IP %s size %lu mbuf_pullup fail", get_in_out_string(is_output), minlen); *data = NULL; goto done; } header = mtod(*data, uint8_t *); done: return header; } static struct mac_nat_entry * bridge_mac_nat_ip_input(struct bridge_softc *sc, mbuf_t *data) { struct in_addr dst; uint8_t *header; struct ip *iphdr; struct mac_nat_entry *mne = NULL; header = get_ether_ip_header_ptr(data, FALSE); if (header == NULL) { goto done; } iphdr = (struct ip *)(void *)(header + sizeof(struct ether_header)); bcopy(&iphdr->ip_dst, &dst, sizeof(dst)); /* XXX validate IP address */ if (dst.s_addr == 0) { goto done; } mne = bridge_lookup_mac_nat_entry_ipv4(sc, &dst); done: return mne; } static void bridge_mac_nat_udp_output(struct bridge_softc *sc, struct bridge_iflist *bif, mbuf_t m, uint8_t ip_header_len, struct mac_nat_record *mnr) { uint16_t dp_flags; errno_t error; size_t offset; struct udphdr udphdr; /* copy the UDP header */ offset = sizeof(struct ether_header) + ip_header_len; error = mbuf_copydata(m, offset, sizeof(struct udphdr), &udphdr); if (error != 0) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MAC_NAT, "mbuf_copydata udphdr failed %d", error); return; } if (udphdr.uh_sport != HTONS_IPPORT_BOOTPC || udphdr.uh_dport != HTONS_IPPORT_BOOTPS) { /* not a BOOTP/DHCP packet */ return; } /* check whether the broadcast bit is already set */ offset += sizeof(struct udphdr) + offsetof(struct dhcp, dp_flags); error = mbuf_copydata(m, offset, sizeof(dp_flags), &dp_flags); if (error != 0) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MAC_NAT, "mbuf_copydata dp_flags failed %d", error); return; } if ((dp_flags & HTONS_DHCP_FLAGS_BROADCAST) != 0) { /* it's already set, nothing to do */ return; } /* broadcast bit needs to be set */ mnr->mnr_ip_dhcp_flags = dp_flags | htons(DHCP_FLAGS_BROADCAST); mnr->mnr_ip_header_len = ip_header_len; if (udphdr.uh_sum != 0) { uint16_t delta; /* adjust checksum to take modified dp_flags into account */ delta = dp_flags - mnr->mnr_ip_dhcp_flags; mnr->mnr_ip_udp_csum = udphdr.uh_sum + delta; } BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MAC_NAT, "%s %s DHCP dp_flags 0x%x UDP cksum 0x%x", sc->sc_if_xname, bif->bif_ifp->if_xname, ntohs(mnr->mnr_ip_dhcp_flags), ntohs(mnr->mnr_ip_udp_csum)); return; } static boolean_t bridge_mac_nat_ip_output(struct bridge_softc *sc, struct bridge_iflist *bif, mbuf_t *data, struct mac_nat_record *mnr) { #pragma unused(mnr) uint8_t *header; struct ether_header *eh; struct in_addr ip; struct ip *iphdr; uint8_t ip_header_len; struct mac_nat_entry *mne = NULL; boolean_t translate = FALSE; header = get_ether_ip_header_ptr(data, TRUE); if (header == NULL) { goto done; } eh = (struct ether_header *)header; iphdr = (struct ip *)(header + sizeof(*eh)); ip_header_len = IP_VHL_HL(iphdr->ip_vhl) << 2; if (ip_header_len < sizeof(ip)) { /* bogus IP header */ goto done; } bcopy(&iphdr->ip_src, &ip, sizeof(ip)); /* XXX validate the source address */ if (ip.s_addr != 0) { mne = bridge_update_mac_nat_entry_ipv4(sc, bif, &ip, (const char *)eh->ether_shost); } if (mnr != NULL) { if (ip.s_addr == 0 && iphdr->ip_p == IPPROTO_UDP) { /* handle DHCP must broadcast */ bridge_mac_nat_udp_output(sc, bif, *data, ip_header_len, mnr); } translate = TRUE; } done: return translate; } #define ETHER_IPV6_HEADER_LEN (sizeof(struct ether_header) + \ + sizeof(struct ip6_hdr)) static uint8_t * __indexable get_ether_ipv6_header_ptr(mbuf_t *data, size_t plen, boolean_t is_output) { uint8_t *header = NULL; int flags = is_output ? BR_DBGF_OUTPUT : BR_DBGF_INPUT; size_t minlen = ETHER_IPV6_HEADER_LEN + plen; if (mbuf_pkthdr_len(*data) < minlen) { BRIDGE_LOG(LOG_DEBUG, flags, "IP %s short frame %lu < %lu", get_in_out_string(is_output), mbuf_pkthdr_len(*data), minlen); goto done; } if (mbuf_len(*data) < minlen && mbuf_pullup(data, minlen) != 0) { BRIDGE_LOG(LOG_DEBUG, flags, "IP %s size %lu mbuf_pullup fail", get_in_out_string(is_output), minlen); *data = NULL; goto done; } header = mtod(*data, uint8_t *); done: return header; } #include <netinet/icmp6.h> #include <netinet6/nd6.h> #define ETHER_ND_LLADDR_LEN (ETHER_ADDR_LEN + sizeof(struct nd_opt_hdr)) static void bridge_mac_nat_icmpv6_output(struct bridge_softc *sc, struct bridge_iflist *bif, mbuf_t *data, struct ip6_hdr *ip6h, struct in6_addr *saddrp, struct mac_nat_record *mnr) { uint8_t *header; struct ether_header *eh; struct icmp6_hdr *icmp6; uint8_t icmp6_type; uint32_t icmp6len; int lladdrlen = 0; char *lladdr = NULL; unsigned int off = sizeof(*ip6h); icmp6len = (u_int32_t)ntohs(ip6h->ip6_plen); if (icmp6len < sizeof(*icmp6)) { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_MAC_NAT, "short IPv6 payload length %d < %lu", icmp6len, sizeof(*icmp6)); return; } /* pullup IP6 header + ICMPv6 header */ header = get_ether_ipv6_header_ptr(data, sizeof(*icmp6), TRUE); if (header == NULL) { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_MAC_NAT, "failed to pullup icmp6 header"); return; } eh = (struct ether_header *)header; ip6h = (struct ip6_hdr *)(header + sizeof(*eh)); icmp6 = (struct icmp6_hdr *)(header + sizeof(*eh) + off); icmp6_type = icmp6->icmp6_type; switch (icmp6_type) { case ND_NEIGHBOR_SOLICIT: case ND_NEIGHBOR_ADVERT: case ND_ROUTER_ADVERT: case ND_ROUTER_SOLICIT: break; default: return; } /* pullup IP6 header + payload */ header = get_ether_ipv6_header_ptr(data, icmp6len, TRUE); if (header == NULL) { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_MAC_NAT, "failed to pullup icmp6 + payload"); return; } eh = (struct ether_header *)header; ip6h = (struct ip6_hdr *)(header + sizeof(*eh)); icmp6 = (struct icmp6_hdr *)(header + sizeof(*eh) + off); switch (icmp6_type) { case ND_NEIGHBOR_SOLICIT: { struct nd_neighbor_solicit *nd_ns; union nd_opts ndopts; boolean_t is_dad_probe; struct in6_addr taddr; if (icmp6len < sizeof(*nd_ns)) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MAC_NAT, "short nd_ns %d < %lu", icmp6len, sizeof(*nd_ns)); return; } nd_ns = (struct nd_neighbor_solicit *)(void *)icmp6; bcopy(&nd_ns->nd_ns_target, &taddr, sizeof(taddr)); if (IN6_IS_ADDR_MULTICAST(&taddr) || IN6_IS_ADDR_UNSPECIFIED(&taddr)) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MAC_NAT, "invalid target ignored"); return; } /* parse options */ nd6_option_init(nd_ns + 1, icmp6len - sizeof(*nd_ns), &ndopts); if (nd6_options(&ndopts) < 0) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MAC_NAT, "invalid ND6 NS option"); return; } if (ndopts.nd_opts_src_lladdr != NULL) { ND_OPT_LLADDR(ndopts.nd_opts_src_lladdr, nd_opt_len, lladdr, lladdrlen); } is_dad_probe = IN6_IS_ADDR_UNSPECIFIED(saddrp); if (lladdr != NULL) { if (is_dad_probe) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MAC_NAT, "bad ND6 DAD packet"); return; } if (lladdrlen != ETHER_ND_LLADDR_LEN) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MAC_NAT, "source lladdrlen %d != %lu", lladdrlen, ETHER_ND_LLADDR_LEN); return; } } if (is_dad_probe) { /* node is trying use taddr, create an mne for taddr */ *saddrp = taddr; } break; } case ND_NEIGHBOR_ADVERT: { struct nd_neighbor_advert *nd_na; union nd_opts ndopts; struct in6_addr taddr; nd_na = (struct nd_neighbor_advert *)(void *)icmp6; if (icmp6len < sizeof(*nd_na)) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MAC_NAT, "short nd_na %d < %lu", icmp6len, sizeof(*nd_na)); return; } bcopy(&nd_na->nd_na_target, &taddr, sizeof(taddr)); if (IN6_IS_ADDR_MULTICAST(&taddr) || IN6_IS_ADDR_UNSPECIFIED(&taddr)) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MAC_NAT, "invalid target ignored"); return; } /* parse options */ nd6_option_init(nd_na + 1, icmp6len - sizeof(*nd_na), &ndopts); if (nd6_options(&ndopts) < 0) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MAC_NAT, "invalid ND6 NA option"); return; } if (ndopts.nd_opts_tgt_lladdr == NULL) { /* target linklayer, nothing to do */ return; } ND_OPT_LLADDR(ndopts.nd_opts_tgt_lladdr, nd_opt_len, lladdr, lladdrlen); if (lladdrlen != ETHER_ND_LLADDR_LEN) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MAC_NAT, "target lladdrlen %d != %lu", lladdrlen, ETHER_ND_LLADDR_LEN); return; } break; } case ND_ROUTER_ADVERT: case ND_ROUTER_SOLICIT: { union nd_opts ndopts; uint32_t type_length; const char *description; if (icmp6_type == ND_ROUTER_ADVERT) { type_length = sizeof(struct nd_router_advert); description = "RA"; } else { type_length = sizeof(struct nd_router_solicit); description = "RS"; } if (icmp6len < type_length) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MAC_NAT, "short ND6 %s %d < %d", description, icmp6len, type_length); return; } /* parse options */ nd6_option_init(((uint8_t *)icmp6) + type_length, icmp6len - type_length, &ndopts); if (nd6_options(&ndopts) < 0) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MAC_NAT, "invalid ND6 %s option", description); return; } if (ndopts.nd_opts_src_lladdr != NULL) { ND_OPT_LLADDR(ndopts.nd_opts_src_lladdr, nd_opt_len, lladdr, lladdrlen); if (lladdrlen != ETHER_ND_LLADDR_LEN) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MAC_NAT, "source lladdrlen %d != %lu", lladdrlen, ETHER_ND_LLADDR_LEN); return; } } break; } default: break; } if (lladdr != NULL) { mnr->mnr_ip6_lladdr_offset = (uint16_t) ((uintptr_t)lladdr - (uintptr_t)eh); mnr->mnr_ip6_icmp6_len = icmp6len; mnr->mnr_ip6_icmp6_type = icmp6_type; mnr->mnr_ip6_header_len = off; if (BRIDGE_DBGF_ENABLED(BR_DBGF_MAC_NAT)) { const char *str; switch (mnr->mnr_ip6_icmp6_type) { case ND_ROUTER_ADVERT: str = "ROUTER ADVERT"; break; case ND_ROUTER_SOLICIT: str = "ROUTER SOLICIT"; break; case ND_NEIGHBOR_ADVERT: str = "NEIGHBOR ADVERT"; break; case ND_NEIGHBOR_SOLICIT: str = "NEIGHBOR SOLICIT"; break; default: str = ""; break; } BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MAC_NAT, "%s %s %s ip6len %d icmp6len %d lladdr offset %d", sc->sc_if_xname, bif->bif_ifp->if_xname, str, mnr->mnr_ip6_header_len, mnr->mnr_ip6_icmp6_len, mnr->mnr_ip6_lladdr_offset); } } } static struct mac_nat_entry * bridge_mac_nat_ipv6_input(struct bridge_softc *sc, mbuf_t *data) { struct in6_addr dst; uint8_t *header; struct ether_header *eh; struct ip6_hdr *ip6h; struct mac_nat_entry *mne = NULL; header = get_ether_ipv6_header_ptr(data, 0, FALSE); if (header == NULL) { goto done; } eh = (struct ether_header *)header; ip6h = (struct ip6_hdr *)(header + sizeof(*eh)); bcopy(&ip6h->ip6_dst, &dst, sizeof(dst)); /* XXX validate IPv6 address */ if (IN6_IS_ADDR_UNSPECIFIED(&dst)) { goto done; } mne = bridge_lookup_mac_nat_entry_ipv6(sc, &dst); done: return mne; } static boolean_t bridge_mac_nat_ipv6_output(struct bridge_softc *sc, struct bridge_iflist *bif, mbuf_t *data, struct mac_nat_record *mnr) { uint8_t *header; struct ether_header *eh; ether_addr_t ether_shost; struct ip6_hdr *ip6h; struct in6_addr saddr; boolean_t translate; translate = (bif == sc->sc_mac_nat_bif) ? FALSE : TRUE; header = get_ether_ipv6_header_ptr(data, 0, TRUE); if (header == NULL) { translate = FALSE; goto done; } eh = (struct ether_header *)header; bcopy(eh->ether_shost, ðer_shost, sizeof(ether_shost)); ip6h = (struct ip6_hdr *)(header + sizeof(*eh)); bcopy(&ip6h->ip6_src, &saddr, sizeof(saddr)); if (mnr != NULL && ip6h->ip6_nxt == IPPROTO_ICMPV6) { bridge_mac_nat_icmpv6_output(sc, bif, data, ip6h, &saddr, mnr); } if (IN6_IS_ADDR_UNSPECIFIED(&saddr)) { goto done; } (void)bridge_update_mac_nat_entry_ipv6(sc, bif, &saddr, (const char *)ether_shost.octet); done: return translate; } /* * Function: bridge_mac_nat_input: * * Purpose: * Process a unicast packet arriving on the external interface `external_ifp`. * * If the packet is ARP, IPv4, or IPv6, lookup the address from the packet in * the mac_nat_entry table. If an entry is found, and the interface is * not `external_ifp`, replace the destination MAC address in the * ethernet header with the corresponding internal MAC address, and return * the interface via `*dst_if`. * * Returns: * NULL if the packet was deallocated during processing. * * Otherwise, returns non-NULL packet that should: * 1) if `*dst_if` is NULL, continue on as an input packet * over `external_ifp`, OR * 2) if `*dst_if` is not NULL, be delivered as an output packet * over `*dst_if`. */ static mbuf_t bridge_mac_nat_input(struct bridge_softc *sc, ifnet_t external_ifp, mbuf_t m, ifnet_t * dst_if) { struct ether_header *eh; mbuf_t m0 = m; struct mac_nat_entry *mne = NULL; BRIDGE_LOCK_ASSERT_HELD(sc); *dst_if = NULL; eh = mtod(m, struct ether_header *); switch (eh->ether_type) { case HTONS_ETHERTYPE_ARP: mne = bridge_mac_nat_arp_input(sc, &m); break; case HTONS_ETHERTYPE_IP: mne = bridge_mac_nat_ip_input(sc, &m); break; case HTONS_ETHERTYPE_IPV6: mne = bridge_mac_nat_ipv6_input(sc, &m); break; default: break; } if (m != NULL & mne != NULL) { *dst_if = mne->mne_bif->bif_ifp; if (*dst_if == external_ifp) { /* receive packet for ifp */ *dst_if = NULL; } else { /* replace the destination MAC with internal one */ if (m != m0) { /* it may have changed */ eh = mtod(m, struct ether_header *); } bcopy(mne->mne_mac, eh->ether_dhost, sizeof(eh->ether_dhost)); } } return m; } static mblist bridge_mac_nat_input_list(struct bridge_softc *sc, ifnet_t external_ifp, mbuf_t m, mbuf_t * forward_head) { mblist forward; mbuf_t next_packet; mblist ret; mblist_init(&ret); mblist_init(&forward); for (mbuf_t scan = m; scan != NULL; scan = next_packet) { ifnet_ref_t dst_if; /* take packet out of the list */ next_packet = scan->m_nextpkt; scan->m_nextpkt = NULL; scan = bridge_mac_nat_input(sc, external_ifp, scan, &dst_if); if (scan != NULL) { if (dst_if != NULL) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MAC_NAT, "%s MAC-NAT input translate to %s", sc->sc_if_xname, dst_if->if_xname); /* use rcvif to store the egress interface */ mbuf_pkthdr_setrcvif(scan, dst_if); /* add it to the forwarding list */ mblist_append(&forward, scan); } else { /* add it to the "continue on as input" list */ BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MAC_NAT, "%s MAC-NAT input for %s", sc->sc_if_xname, external_ifp->if_xname); mblist_append(&ret, scan); } } } *forward_head = forward.head; return ret; } /* * bridge_mac_nat_translate_list: * Process a list of packets destined to the MAC-NAT interface `dst_if` * from the bridge member `sbif`. * * For each packet in the list, update the MAC-NAT record, and if * translation is required, translate it. * * Returns the list of packets that should be delivered to the MAC-NAT * interface. */ static mbuf_t bridge_mac_nat_translate_list(struct bridge_softc * sc, struct bridge_iflist *sbif, ifnet_t dst_if, mbuf_t m) { mbuf_t next_packet; mblist ret; mblist_init(&ret); for (mbuf_ref_t scan = m; scan != NULL; scan = next_packet) { struct mac_nat_record mnr; bool translate_mac; /* take packet out of the list */ next_packet = scan->m_nextpkt; scan->m_nextpkt = NULL; translate_mac = bridge_mac_nat_output(sc, sbif, &scan, &mnr); if (scan != NULL) { if (translate_mac) { bridge_mac_nat_translate(&scan, &mnr, IF_LLADDR(dst_if)); } if (scan != NULL) { /* add it back to the list */ mblist_append(&ret, scan); } } } return ret.head; } /* * bridge_mac_nat_copy_and_translate_list: * Same as bridge_mac_nat_translate_list() except that a copy of the * packet list is returned instead. * * The packet list `m` is left unaltered. */ static mbuf_t bridge_mac_nat_copy_and_translate_list(struct bridge_softc * sc, struct bridge_iflist *sbif, ifnet_t dst_if, mbuf_t m) { mbuf_t next_packet; mblist ret; mblist_init(&ret); for (mbuf_t scan = m; scan != NULL; scan = next_packet) { mbuf_ref_t mc = NULL; struct mac_nat_record mnr; bool translate_mac; /* take packet out of the list, make a copy, put it back */ next_packet = scan->m_nextpkt; scan->m_nextpkt = NULL; mc = m_dup(scan, M_DONTWAIT); scan->m_nextpkt = next_packet; if (mc == NULL) { continue; } translate_mac = bridge_mac_nat_output(sc, sbif, &mc, &mnr); if (mc != NULL) { if (translate_mac) { bridge_mac_nat_translate(&mc, &mnr, IF_LLADDR(dst_if)); } if (mc != NULL) { /* add it to the new list */ mblist_append(&ret, mc); } } } return ret.head; } static void bridge_mac_nat_forward_list(ifnet_t bridge_ifp, ether_type_flag_t etypef, mbuf_t m) { int count = 0; ifnet_t dst_if; mblist list; int n_lists = 0; mbuf_t next_packet; mblist_init(&list); for (mbuf_t scan = m; scan != NULL; scan = next_packet) { ifnet_t this_if; next_packet = scan->m_nextpkt; this_if = mbuf_pkthdr_rcvif(scan); mbuf_pkthdr_setrcvif(scan, NULL); if (list.head == NULL) { /* start a new list */ list.head = list.tail = scan; count = 1; dst_if = this_if; } else if (dst_if != this_if) { /* send up the previous chain */ if (list.tail != NULL) { /* terminate the list */ list.tail->m_nextpkt = NULL; } n_lists++; BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MAC_NAT, "(%s): sublist %u pkts %u", dst_if->if_xname, n_lists, count); bridge_enqueue(bridge_ifp, NULL, dst_if, etypef, list.head, CHECKSUM_OPERATION_CLEAR_OFFLOAD, pkt_direction_RX); /* start new list */ list.head = list.tail = scan; count = 1; dst_if = this_if; } else { count++; list.tail = scan; } if (next_packet == NULL) { /* last list */ n_lists++; BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MAC_NAT, "(%s): sublist %u pkts %u", dst_if->if_xname, n_lists, count); bridge_enqueue(bridge_ifp, NULL, dst_if, etypef, list.head, CHECKSUM_OPERATION_CLEAR_OFFLOAD, pkt_direction_RX); } } return; } /* * bridge_mac_nat_output: * Process a packet destined to the MAC NAT interface (sc_mac_nat_bif) * from the interface 'bif'. * * Create a mac_nat_entry containing the source IP address and MAC address * from the packet. Populate a mac_nat_record with information detailing * how to translate the packet. Translation takes place later by calling * `bridge_mac_nat_translate()`. * * If 'bif' == sc_mac_nat_bif, the stack over the MAC NAT * interface is generating an output packet. No translation is required in this * case, we just record the IP address used to prevent another bif from * claiming our IP address. * * Returns: * TRUE if the packet should be translated (*mnr updated as well), * FALSE otherwise. * * *data may be updated to point at a different mbuf chain or NULL if * the chain was deallocated during processing. */ static boolean_t bridge_mac_nat_output(struct bridge_softc *sc, struct bridge_iflist *bif, mbuf_t *data, struct mac_nat_record *mnr) { struct ether_header *eh; boolean_t translate = FALSE; BRIDGE_LOCK_ASSERT_HELD(sc); assert(sc->sc_mac_nat_bif != NULL); eh = mtod(*data, struct ether_header *); if (mnr != NULL) { bzero(mnr, sizeof(*mnr)); mnr->mnr_ether_type = eh->ether_type; } switch (eh->ether_type) { case HTONS_ETHERTYPE_ARP: translate = bridge_mac_nat_arp_output(sc, bif, data, mnr); break; case HTONS_ETHERTYPE_IP: translate = bridge_mac_nat_ip_output(sc, bif, data, mnr); break; case HTONS_ETHERTYPE_IPV6: translate = bridge_mac_nat_ipv6_output(sc, bif, data, mnr); break; default: break; } return translate; } static void bridge_mac_nat_arp_translate(mbuf_t *data, struct mac_nat_record *mnr, const char eaddr[ETHER_ADDR_LEN]) { errno_t error; if (mnr->mnr_arp_offset == 0) { return; } /* replace the source hardware address */ error = mbuf_copyback(*data, mnr->mnr_arp_offset, ETHER_ADDR_LEN, eaddr, MBUF_DONTWAIT); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_MAC_NAT, "mbuf_copyback failed"); m_drop(*data, DROPTAP_FLAG_DIR_IN, DROP_REASON_BRIDGE_MAC_NAT_FAILURE, NULL, 0); *data = NULL; } return; } static void bridge_mac_nat_ip_translate(mbuf_t *data, struct mac_nat_record *mnr) { errno_t error; size_t offset; if (mnr->mnr_ip_header_len == 0) { return; } /* update the UDP checksum */ offset = sizeof(struct ether_header) + mnr->mnr_ip_header_len; error = mbuf_copyback(*data, offset + offsetof(struct udphdr, uh_sum), sizeof(mnr->mnr_ip_udp_csum), &mnr->mnr_ip_udp_csum, MBUF_DONTWAIT); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_MAC_NAT, "mbuf_copyback uh_sum failed"); m_drop(*data, DROPTAP_FLAG_DIR_IN, DROP_REASON_BRIDGE_MAC_NAT_FAILURE, NULL, 0); *data = NULL; } /* update the DHCP must broadcast flag */ offset += sizeof(struct udphdr); error = mbuf_copyback(*data, offset + offsetof(struct dhcp, dp_flags), sizeof(mnr->mnr_ip_dhcp_flags), &mnr->mnr_ip_dhcp_flags, MBUF_DONTWAIT); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_MAC_NAT, "mbuf_copyback dp_flags failed"); m_drop(*data, DROPTAP_FLAG_DIR_IN, DROP_REASON_BRIDGE_MAC_NAT_FAILURE, NULL, 0); *data = NULL; } } static void bridge_mac_nat_ipv6_translate(mbuf_t *data, struct mac_nat_record *mnr, const char eaddr[ETHER_ADDR_LEN]) { uint16_t cksum; errno_t error; mbuf_t m = *data; if (mnr->mnr_ip6_header_len == 0) { return; } switch (mnr->mnr_ip6_icmp6_type) { case ND_ROUTER_ADVERT: case ND_ROUTER_SOLICIT: case ND_NEIGHBOR_SOLICIT: case ND_NEIGHBOR_ADVERT: if (mnr->mnr_ip6_lladdr_offset == 0) { /* nothing to do */ return; } break; default: return; } /* * replace the lladdr */ error = mbuf_copyback(m, mnr->mnr_ip6_lladdr_offset, ETHER_ADDR_LEN, eaddr, MBUF_DONTWAIT); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_MAC_NAT, "mbuf_copyback lladdr failed"); m_drop(m, DROPTAP_FLAG_DIR_IN, DROP_REASON_BRIDGE_MAC_NAT_FAILURE, NULL, 0); *data = NULL; return; } /* * recompute the icmp6 checksum */ /* skip past the ethernet header */ _mbuf_adjust_pkthdr_and_data(m, ETHER_HDR_LEN); #define CKSUM_OFFSET_ICMP6 offsetof(struct icmp6_hdr, icmp6_cksum) /* set the checksum to zero */ cksum = 0; error = mbuf_copyback(m, mnr->mnr_ip6_header_len + CKSUM_OFFSET_ICMP6, sizeof(cksum), &cksum, MBUF_DONTWAIT); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_MAC_NAT, "mbuf_copyback cksum=0 failed"); m_drop(m, DROPTAP_FLAG_DIR_IN, DROP_REASON_BRIDGE_CHECKSUM, NULL, 0); *data = NULL; return; } /* compute and set the new checksum */ cksum = in6_cksum(m, IPPROTO_ICMPV6, mnr->mnr_ip6_header_len, mnr->mnr_ip6_icmp6_len); error = mbuf_copyback(m, mnr->mnr_ip6_header_len + CKSUM_OFFSET_ICMP6, sizeof(cksum), &cksum, MBUF_DONTWAIT); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, BR_DBGF_MAC_NAT, "mbuf_copyback cksum failed"); m_drop(m, DROPTAP_FLAG_DIR_IN, DROP_REASON_BRIDGE_CHECKSUM, NULL, 0); *data = NULL; return; } /* restore the ethernet header */ _mbuf_adjust_pkthdr_and_data(m, -ETHER_HDR_LEN); return; } static void bridge_mac_nat_translate(mbuf_t *data, struct mac_nat_record *mnr, const char eaddr[ETHER_ADDR_LEN]) { struct ether_header *eh; /* replace the source ethernet address with the single MAC */ eh = mtod(*data, struct ether_header *); bcopy(eaddr, eh->ether_shost, sizeof(eh->ether_shost)); switch (mnr->mnr_ether_type) { case HTONS_ETHERTYPE_ARP: bridge_mac_nat_arp_translate(data, mnr, eaddr); break; case HTONS_ETHERTYPE_IP: bridge_mac_nat_ip_translate(data, mnr); break; case HTONS_ETHERTYPE_IPV6: bridge_mac_nat_ipv6_translate(data, mnr, eaddr); break; default: break; } return; } /* * bridge packet filtering */ /* * Perform basic checks on header size since * pfil assumes ip_input has already processed * it for it. Cut-and-pasted from ip_input.c. * Given how simple the IPv6 version is, * does the IPv4 version really need to be * this complicated? * * XXX Should we update ipstat here, or not? * XXX Right now we update ipstat but not * XXX csum_counter. */ static int bridge_ip_checkbasic(struct mbuf **mp) { struct mbuf *m = *mp; struct ip *ip; int len, hlen; u_short sum; if (*mp == NULL) { return -1; } if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { /* max_linkhdr is already rounded up to nearest 4-byte */ if ((m = m_copyup(m, sizeof(struct ip), max_linkhdr)) == NULL) { /* XXXJRT new stat, please */ ipstat.ips_toosmall++; goto bad; } } else if (OS_EXPECT((size_t)m->m_len < sizeof(struct ip), 0)) { if ((m = m_pullup(m, sizeof(struct ip))) == NULL) { ipstat.ips_toosmall++; goto bad; } } ip = mtod(m, struct ip *); if (ip == NULL) { goto bad; } if (IP_VHL_V(ip->ip_vhl) != IPVERSION) { ipstat.ips_badvers++; goto bad; } hlen = IP_VHL_HL(ip->ip_vhl) << 2; if (hlen < (int)sizeof(struct ip)) { /* minimum header length */ ipstat.ips_badhlen++; goto bad; } if (hlen > m->m_len) { if ((m = m_pullup(m, hlen)) == 0) { ipstat.ips_badhlen++; goto bad; } ip = mtod(m, struct ip *); if (ip == NULL) { goto bad; } } if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); } else { if (hlen == sizeof(struct ip)) { sum = in_cksum_hdr(ip); } else { sum = in_cksum(m, hlen); } } if (sum) { ipstat.ips_badsum++; goto bad; } /* Retrieve the packet length. */ len = ntohs(ip->ip_len); /* * Check for additional length bogosity */ if (len < hlen) { ipstat.ips_badlen++; goto bad; } /* * Check that the amount of data in the buffers * is as at least much as the IP header would have us expect. * Drop packet if shorter than we expect. */ if (m->m_pkthdr.len < len) { ipstat.ips_tooshort++; goto bad; } /* Checks out, proceed */ *mp = m; return 0; bad: *mp = m; return -1; } /* * Same as above, but for IPv6. * Cut-and-pasted from ip6_input.c. * XXX Should we update ip6stat, or not? */ static int bridge_ip6_checkbasic(struct mbuf **mp) { struct mbuf *m = *mp; struct ip6_hdr *ip6; /* * If the IPv6 header is not aligned, slurp it up into a new * mbuf with space for link headers, in the event we forward * it. Otherwise, if it is aligned, make sure the entire base * IPv6 header is in the first mbuf of the chain. */ if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { struct ifnet *inifp = m->m_pkthdr.rcvif; /* max_linkhdr is already rounded up to nearest 4-byte */ if ((m = m_copyup(m, sizeof(struct ip6_hdr), max_linkhdr)) == NULL) { /* XXXJRT new stat, please */ ip6stat.ip6s_toosmall++; in6_ifstat_inc(inifp, ifs6_in_hdrerr); goto bad; } } else if (OS_EXPECT((size_t)m->m_len < sizeof(struct ip6_hdr), 0)) { struct ifnet *inifp = m->m_pkthdr.rcvif; if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { ip6stat.ip6s_toosmall++; in6_ifstat_inc(inifp, ifs6_in_hdrerr); goto bad; } } ip6 = mtod(m, struct ip6_hdr *); if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { ip6stat.ip6s_badvers++; in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); goto bad; } /* Checks out, proceed */ *mp = m; return 0; bad: *mp = m; return -1; } /* * the PF routines expect to be called from ip_input, so we * need to do and undo here some of the same processing. * * XXX : this is heavily inspired on bridge_pfil() */ static int bridge_pf(struct mbuf **mp, struct ifnet *ifp, uint32_t sc_filter_flags, bool input) { /* * XXX : mpetit : heavily inspired by bridge_pfil() */ int snap, error, i, hlen; struct ether_header *eh1, eh2; struct ip *ip; struct llc llc1; u_int16_t ether_type; snap = 0; error = -1; /* Default error if not error == 0 */ if ((sc_filter_flags & IFBF_FILT_MEMBER) == 0) { return 0; /* filtering is disabled */ } i = min((*mp)->m_pkthdr.len, max_protohdr); if ((*mp)->m_len < i) { *mp = m_pullup(*mp, i); if (*mp == NULL) { BRIDGE_LOG(LOG_NOTICE, 0, "m_pullup failed"); return -1; } } eh1 = mtod(*mp, struct ether_header *); ether_type = ntohs(eh1->ether_type); /* * Check for SNAP/LLC. */ if (ether_type < ETHERMTU) { struct llc *llc2 = (struct llc *)(eh1 + 1); if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && llc2->llc_dsap == LLC_SNAP_LSAP && llc2->llc_ssap == LLC_SNAP_LSAP && llc2->llc_control == LLC_UI) { ether_type = htons(llc2->llc_un.type_snap.ether_type); snap = 1; } } /* * If we're trying to filter bridge traffic, don't look at anything * other than IP and ARP traffic. If the filter doesn't understand * IPv6, don't allow IPv6 through the bridge either. This is lame * since if we really wanted, say, an AppleTalk filter, we are hosed, * but of course we don't have an AppleTalk filter to begin with. * (Note that since pfil doesn't understand ARP it will pass *ALL* * ARP traffic.) */ switch (ether_type) { case ETHERTYPE_ARP: case ETHERTYPE_REVARP: return 0; /* Automatically pass */ case ETHERTYPE_IP: case ETHERTYPE_IPV6: break; default: /* * Check to see if the user wants to pass non-ip * packets, these will not be checked by pf and * passed unconditionally so the default is to drop. */ if ((sc_filter_flags & IFBF_FILT_ONLYIP)) { goto bad; } break; } /* Strip off the Ethernet header and keep a copy. */ m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t)&eh2); m_adj(*mp, ETHER_HDR_LEN); /* Strip off snap header, if present */ if (snap) { m_copydata(*mp, 0, sizeof(struct llc), (caddr_t)&llc1); m_adj(*mp, sizeof(struct llc)); } /* * Check the IP header for alignment and errors */ switch (ether_type) { case ETHERTYPE_IP: error = bridge_ip_checkbasic(mp); break; case ETHERTYPE_IPV6: error = bridge_ip6_checkbasic(mp); break; default: error = 0; break; } if (error) { goto bad; } error = 0; /* * Run the packet through pf rules */ switch (ether_type) { case ETHERTYPE_IP: /* * before calling the firewall, swap fields the same as * IP does. here we assume the header is contiguous */ ip = mtod(*mp, struct ip *); ip->ip_len = ntohs(ip->ip_len); ip->ip_off = ntohs(ip->ip_off); if (ifp != NULL) { error = pf_af_hook(ifp, 0, mp, AF_INET, input, NULL); } if (*mp == NULL || error != 0) { /* filter may consume */ break; } /* Recalculate the ip checksum and restore byte ordering */ ip = mtod(*mp, struct ip *); hlen = IP_VHL_HL(ip->ip_vhl) << 2; if (hlen < (int)sizeof(struct ip)) { goto bad; } if (hlen > (*mp)->m_len) { if ((*mp = m_pullup(*mp, hlen)) == 0) { goto bad; } ip = mtod(*mp, struct ip *); if (ip == NULL) { goto bad; } } ip->ip_len = htons(ip->ip_len); ip->ip_off = htons(ip->ip_off); ip->ip_sum = 0; if (hlen == sizeof(struct ip)) { ip->ip_sum = in_cksum_hdr(ip); } else { ip->ip_sum = in_cksum(*mp, hlen); } break; case ETHERTYPE_IPV6: if (ifp != NULL) { error = pf_af_hook(ifp, 0, mp, AF_INET6, input, NULL); } if (*mp == NULL || error != 0) { /* filter may consume */ break; } break; default: error = 0; break; } if (*mp == NULL) { return error; } if (error != 0) { goto bad; } error = -1; /* * Finally, put everything back the way it was and return */ if (snap) { M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT, 0); if (*mp == NULL) { return error; } bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); } M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT, 0); if (*mp == NULL) { return error; } bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); return 0; bad: m_drop(*mp, DROPTAP_FLAG_DIR_IN, DROP_REASON_BRIDGE_PF, NULL, 0); *mp = NULL; return error; } #if BRIDGESTP static void bridge_bstp_input_list(struct bstp_port *bp, struct mbuf *head) { mbuf_t next_packet = NULL; for (mbuf_t scan = head; scan != NULL; scan = next_packet) { next_packet = scan->m_nextpkt; scan->m_nextpkt = NULL; bstp_input(bp, scan); } } #endif /* BRIDGESTP */ static mblist bridge_filter_arp_list(struct bridge_iflist * bif, mbuf_t m) { mbuf_t next_packet = NULL; mblist ret; mblist_init(&ret); for (mbuf_ref_t scan = m; scan != NULL; scan = next_packet) { errno_t error; /* take packet out of the list */ next_packet = scan->m_nextpkt; scan->m_nextpkt = NULL; /* filter the ARP packet */ error = bridge_host_filter_arp(bif, &scan); if (error != 0 && scan != NULL) { if (BRIDGE_DBGF_ENABLED(BR_DBGF_HOSTFILTER)) { brlog_mbuf_data(scan, 0, sizeof(struct ether_header) + sizeof(struct ip)); } m_drop(scan, DROPTAP_FLAG_DIR_IN, DROP_REASON_BRIDGE_HOST_FILTER, NULL, 0); scan = NULL; } if (scan != NULL) { /* add it to the list */ mblist_append(&ret, scan); } } return ret; } static mbuf_t bridge_filter_checksum(ifnet_t bridge_ifp, struct bridge_iflist * bif, mbuf_t m, bool is_ipv4, bool host_filter, bool checksum) { uint32_t dbgf = 0; errno_t error; ip_packet_info info; u_int mac_hlen = sizeof(struct ether_header); drop_reason_t drop_reason = DROP_REASON_BRIDGE_UNSPECIFIED; if (host_filter) { dbgf |= BR_DBGF_HOSTFILTER; } if (checksum) { dbgf |= BR_DBGF_CHECKSUM; } /* get the IP protocol header */ error = bridge_get_ip_proto(&m, mac_hlen, is_ipv4, &info, &bif->bif_stats.brms_in_ip); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, dbgf, "%s(%s) bridge_get_ip_proto failed %d", bridge_ifp->if_xname, bif->bif_ifp->if_xname, error); drop_reason = DROP_REASON_BRIDGE_NO_PROTO; goto drop; } if (host_filter) { bool drop = true; /* restrict IP protocols */ switch (info.ip_proto) { case IPPROTO_ICMP: case IPPROTO_IGMP: drop = !is_ipv4; break; case IPPROTO_TCP: case IPPROTO_UDP: drop = false; break; case IPPROTO_ICMPV6: drop = is_ipv4; break; default: break; } if (drop) { BRIDGE_HF_DROP(brhf_ip_bad_proto, __func__, __LINE__); drop_reason = DROP_REASON_BRIDGE_BAD_PROTO; goto drop; } bridge_hostfilter_stats.brhf_ip_ok += 1; } if (checksum) { /* need to compute IP/UDP/TCP/checksums */ error = bridge_offload_checksum(&m, &info, &bif->bif_stats); if (error != 0) { BRIDGE_LOG(LOG_NOTICE, dbgf, "%s(%s) bridge_offload_checksum failed %d", bridge_ifp->if_xname, bif->bif_ifp->if_xname, error); drop_reason = DROP_REASON_BRIDGE_CHECKSUM; goto drop; } } return m; drop: /* toss the packet */ if (m != NULL) { if (host_filter && BRIDGE_DBGF_ENABLED(BR_DBGF_HOSTFILTER)) { brlog_mbuf_data(m, 0, sizeof(struct ether_header) + sizeof(struct ip)); } m_drop(m, DROPTAP_FLAG_DIR_IN, drop_reason, NULL, 0); m = NULL; } return NULL; } static mblist bridge_filter_checksum_list(ifnet_t bridge_ifp, struct bridge_iflist * bif, mbuf_t in_list, ether_type_flag_t etypef, bool host_filter, bool checksum) { bool is_ipv4 = (etypef == ETHER_TYPE_FLAG_IPV4); mbuf_t next_packet = NULL; mblist ret; mblist_init(&ret); for (mbuf_t scan = in_list; scan != NULL; scan = next_packet) { /* take packet out of the list */ next_packet = scan->m_nextpkt; scan->m_nextpkt = NULL; scan = bridge_filter_checksum(bridge_ifp, bif, scan, is_ipv4, host_filter, checksum); if (scan != NULL) { /* add packet to the list */ mblist_append(&ret, scan); } } return ret; } static mbuf_t bridge_checksum_offload_list(ifnet_t bridge_ifp, struct bridge_iflist * bif, mbuf_t m, bool is_ipv4) { mblist ret; mbuf_t next_packet; mblist_init(&ret); for (mbuf_t scan = m; scan != NULL; scan = next_packet) { uint32_t csum_flags; /* take it out of the list */ next_packet = scan->m_nextpkt; scan->m_nextpkt = NULL; csum_flags = scan->m_pkthdr.csum_flags; if ((csum_flags & checksum_request_flags) != 0) { /* compute the checksum now */ scan = bridge_filter_checksum(bridge_ifp, bif, scan, is_ipv4, false, true); if (scan != NULL) { /* clear offload now */ scan->m_pkthdr.csum_flags &= csum_flags; } } if (scan != NULL) { mblist_append(&ret, scan); } } return ret.head; } static mbuf_t copy_broadcast_packet(mbuf_t m) { mbuf_t mc; /* make a copy of the packet */ mc = m_dup(m, M_DONTWAIT); if (mc != NULL) { struct ether_header *eh; /* make copy look like it is broadcast */ mc->m_flags |= M_BCAST; eh = mtod(mc, struct ether_header *); bcopy(etherbroadcastaddr, eh->ether_dhost, ETHER_ADDR_LEN); } return mc; } static mblist bridge_find_broadcast_ipv4(mbuf_t in_list, mbuf_t * ip_bcast_head) { mblist ip_bcast; mbuf_t next_packet = NULL; mblist ret; mblist_init(&ret); mblist_init(&ip_bcast); for (mbuf_ref_t scan = in_list; scan != NULL; scan = next_packet) { mbuf_t bcast_pkt = NULL; uint8_t *header; /* take packet out of the list */ next_packet = scan->m_nextpkt; scan->m_nextpkt = NULL; header = get_ether_ip_header_ptr(&scan, FALSE); if (header != NULL) { struct in_addr dst; struct ip *iphdr; iphdr = (struct ip *)(header + sizeof(struct ether_header)); bcopy(&iphdr->ip_dst, &dst, sizeof(dst)); if (dst.s_addr == INADDR_BROADCAST) { bcast_pkt = copy_broadcast_packet(scan); } } if (bcast_pkt != NULL) { /* add packet to broadcast list */ mblist_append(&ip_bcast, bcast_pkt); } if (scan != NULL) { /* add packet back into the list */ mblist_append(&ret, scan); } } *ip_bcast_head = ip_bcast.head; return ret; } static ifnet_t bridge_find_member(struct bridge_softc * sc, uint8_t * lladdr, struct bridge_iflist * sbif) { struct bridge_iflist * bif; TAILQ_FOREACH(bif, &sc->sc_iflist, bif_next) { if (bif == sbif) { /* skip the input member */ continue; } if (_ether_cmp(IF_LLADDR(bif->bif_ifp), lladdr) == 0) { return bif->bif_ifp; } } return NULL; } /* * Function: bridge_input_list * * Purpose: * Process a list of input packets through the bridge. * The caller ensures that all of the packets in the list * `list_head` .. `list_tail` have the same ethernet header. * * Returns: * Non-NULL head of the chain of packets that were not consumed/freed, * *tail_p set to the tail of that chain. * * NULL if all of the packets were consumed. */ static mblist bridge_input_list(struct bridge_softc * sc, ifnet_t ifp, struct ether_header * eh_in_p, mblist list, bool is_promisc) { struct bridge_iflist * bif; ifnet_t bridge_ifp; bool bridge_needs_input; bool checksum_offload; uint8_t * dhost; #if BRIDGESTP bool discarding = false; #endif /* BRIDGESTP */ ifnet_t dst_if = NULL; errno_t error; ether_type_flag_t etypef; bool host_filter; bool host_filter_drop = false; mbuf_ref_t ip_bcast = NULL; bool is_bridge_mac = false; bool is_broadcast; bool is_ifp_mac; ifnet_t member_input = NULL; uint8_t * shost; bool uses_virtio = false; uint16_t vlan; if (ifp->if_bridge == NULL) { /* no longer part of bridge */ goto done; } bridge_ifp = sc->sc_ifp; is_broadcast = IS_BCAST_MCAST(list.head); is_ifp_mac = (!is_broadcast && !is_promisc); BRIDGE_LOG(LOG_DEBUG, BR_DBGF_INPUT, "%s from %s count %d head 0x%llx.0x%llx tail 0x%llx.0x%llx", bridge_ifp->if_xname, ifp->if_xname, list.count, (uint64_t)VM_KERNEL_ADDRPERM(list.head), (uint64_t)VM_KERNEL_ADDRPERM(mtod(list.head, void *)), (uint64_t)VM_KERNEL_ADDRPERM(list.tail), (uint64_t)VM_KERNEL_ADDRPERM(mtod(list.tail, void *))); /* assume we'll return all packets */ if ((bridge_ifp->if_flags & IFF_RUNNING) == 0) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_INPUT, "%s not running passing along", bridge_ifp->if_xname); goto done; } vlan = VLANTAGOF(m); /* lookup the bridge member */ BRIDGE_LOCK(sc); bif = bridge_lookup_member_if(sc, ifp); if (bif == NULL) { BRIDGE_UNLOCK(sc); BRIDGE_LOG(LOG_DEBUG, BR_DBGF_INPUT, "%s bridge_lookup_member_if failed", bridge_ifp->if_xname); goto done; } uses_virtio = bif_uses_virtio(bif); /* * host filter drops packets that: * - are not ARP, IPv4, or IPv6 * - have incorrect source MAC address */ host_filter = (bif->bif_flags & BIFF_HOST_FILTER) != 0; etypef = ether_type_flag_get(eh_in_p->ether_type); if (host_filter && (etypef & ETHER_TYPE_FLAG_IP_ARP) == 0) { /* ether type not one of ARP, IPv4, or IPv6 */ BRIDGE_HF_DROP(brhf_bad_ether_type, __func__, __LINE__); host_filter_drop = true; } else if ((bif->bif_flags & BIFF_HF_HWSRC) != 0 && bcmp(eh_in_p->ether_shost, bif->bif_hf_hwsrc, ETHER_ADDR_LEN) != 0) { /* only allow the single source MAC address */ BRIDGE_HF_DROP(brhf_bad_ether_srchw_addr, __func__, __LINE__); host_filter_drop = true; } if (host_filter_drop) { BRIDGE_UNLOCK(sc); m_drop_list(list.head, bridge_ifp, DROPTAP_FLAG_DIR_IN, DROP_REASON_BRIDGE_HOST_FILTER, NULL, 0); list.head = list.tail = NULL; goto done; } #if BRIDGESTP discarding = (bif->bif_ifflags & IFBIF_STP) != 0 && bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING; #endif /* BRIDGESTP */ dhost = eh_in_p->ether_dhost; shost = eh_in_p->ether_shost; /* * Reserved multicast address listed in 802.1D section 7.12.6 * must not be forwarded by the bridge. * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F */ if (is_broadcast) { if (IS_MCAST(list.head)) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_MCAST, " multicast: " "%02x:%02x:%02x:%02x:%02x:%02x", dhost[0], dhost[1], dhost[2], dhost[3], dhost[4], dhost[5]); } if (bcmp(dhost, bstp_etheraddr, (ETHER_ADDR_LEN - 1)) == 0) { if (dhost[5] == BSTP_ETHERADDR_RANGE_FIRST) { /* multicast for spanning tree */ #if BRIDGESTP bridge_bstp_input_list(&bif->bif_stp, list.head); #else /* BRIDGESTP */ m_freem_list(list.head); #endif /* BRIDGESTP */ list.head = list.tail = NULL; BRIDGE_UNLOCK(sc); goto done; } if (dhost[5] <= BSTP_ETHERADDR_RANGE_LAST) { /* allow packet to continue up the stack */ BRIDGE_UNLOCK(sc); goto done; } } /* broadcast to all members */ os_atomic_add(&bridge_ifp->if_imcasts, list.count, relaxed); } #if BRIDGESTP if (discarding) { BRIDGE_UNLOCK(sc); goto done; } #endif /* BRIDGESTP */ /* If the interface is learning, record the address. */ if ((bif->bif_ifflags & IFBIF_LEARNING) != 0) { error = bridge_rtupdate(sc, shost, vlan, bif, 0, IFBAF_DYNAMIC); /* * If the interface has addresses limits then deny any source * that is not in the cache. */ if (error != 0 && bif->bif_addrmax) { BRIDGE_UNLOCK(sc); goto done; } } #if BRIDGESTP if ((bif->bif_ifflags & IFBIF_STP) != 0 && bif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) { BRIDGE_UNLOCK(sc); goto done; } #endif /* BRIDGESTP */ /* * If the packet is not IP, let the host filter drop ARP packets. * Otherwise, if the host filter is enabled or we need to compute * checksums, do that. * Otherwise, if MAC-NAT is enabled and this is an IPv4 packet, * check for IPv4 broadcast packets. Accumulate those in a separate * list `ip_bcast`. */ checksum_offload = bif_has_checksum_offload(bif); if (!ether_type_flag_is_ip(etypef)) { /* host filter process ARP */ if (host_filter) { /* host filter check earlier means this must be ARP */ VERIFY(etypef == ETHER_TYPE_FLAG_ARP); list = bridge_filter_arp_list(bif, list.head); if (list.head == NULL) { VERIFY(list.tail == NULL); BRIDGE_UNLOCK(sc); goto done; } } } else if (host_filter || checksum_offload) { /* host filter and/or checksum */ list = bridge_filter_checksum_list(bridge_ifp, bif, list.head, etypef, host_filter, checksum_offload); if (list.head == NULL) { VERIFY(list.tail == NULL); BRIDGE_UNLOCK(sc); goto done; } } else if (is_ifp_mac && bif == sc->sc_mac_nat_bif && etypef == ETHER_TYPE_FLAG_IPV4) { /* look for broadcast IPv4 packet */ list = bridge_find_broadcast_ipv4(list.head, &ip_bcast); if (list.head == NULL && ip_bcast == NULL) { /* all packets were consumed */ BRIDGE_UNLOCK(sc); goto done; } } /* * If the bridge has ULP attached, and the destination MAC * matches the bridge interface, claim the packets for the bridge * interface. */ bridge_needs_input = (sc->sc_flags & SCF_PROTO_ATTACHED) != 0; if (bridge_needs_input && !is_broadcast && _ether_cmp(dhost, IF_LLADDR(bridge_ifp)) == 0) { is_bridge_mac = true; } if (is_ifp_mac) { /* unicast to the interface */ if (sc->sc_mac_nat_bif == bif) { mbuf_ref_t forward = NULL; if (list.head != NULL) { /* handle MAC-NAT if enabled */ list = bridge_mac_nat_input_list(sc, ifp, list.head, &forward); } if (ip_bcast != NULL) { /* forward to all members except this one */ /* bridge_broadcast_list unlocks */ bridge_broadcast_list(sc, bif, etypef, ip_bcast, pkt_direction_RX); } else { BRIDGE_UNLOCK(sc); } if (forward != NULL) { bridge_mac_nat_forward_list(bridge_ifp, etypef, forward); } } else { BRIDGE_UNLOCK(sc); } /* unicast packets for this interface do not get forwarded */ goto done; } if (is_bridge_mac || list.head == NULL) { BRIDGE_UNLOCK(sc); goto done; } if (!is_broadcast) { /* find where to send the packet */ dst_if = bridge_rtlookup(sc, dhost, vlan); if (ifp == dst_if) { /* nothing to forward */ BRIDGE_UNLOCK(sc); goto done; } if (dst_if == NULL) { /* if a member is the dhost, deliver as input */ member_input = bridge_find_member(sc, dhost, bif); if (member_input != NULL) { /* grab packets destined to member */ BRIDGE_UNLOCK(sc); goto done; } /* if a member is shost, there's a loop, drop it */ if (bridge_find_member(sc, shost, bif) != NULL) { BRIDGE_UNLOCK(sc); m_drop_list(list.head, bridge_ifp, DROPTAP_FLAG_DIR_IN, DROP_REASON_BRIDGE_LOOP, NULL, 0); list.head = list.tail = NULL; goto done; } } } if (dst_if == NULL) { mbuf_t m; m = copy_packet_list(list.head); if (m != NULL) { /* bridge_broadcast_list unlocks */ bridge_broadcast_list(sc, bif, etypef, m, pkt_direction_RX); } else { BRIDGE_UNLOCK(sc); } } else { /* bridge_forward_list() consumes list and unlocks */ bridge_forward_list(sc, bif, dst_if, etypef, list.head); list.head = list.tail = NULL; } done: if (list.head != NULL) { if (member_input != NULL) { /* member gets the packets */ inject_input_packet_list(member_input, list.head, true); list.head = list.tail = NULL; } else if (is_bridge_mac) { /* bridge consumes all the unicast packets */ bridge_interface_input_list(bridge_ifp, etypef, list, uses_virtio); list.head = list.tail = NULL; } else { adjust_input_packet_list(list.head); } } return list; } static inline void update_mbuf_flags(struct ifnet * ifp, mbuf_t m, struct ether_header * eh) { /* duplicate some of the work done in ether_demux */ if ((eh->ether_dhost[0] & 1) == 0) { if (_ether_cmp(eh->ether_dhost, IF_LLADDR(ifp)) != 0) { m->m_flags |= M_PROMISC; } } else { /* Check for broadcast */ if (_ether_cmp(etherbroadcastaddr, eh->ether_dhost) == 0) { m->m_flags |= M_BCAST; } else { m->m_flags |= M_MCAST; } } if (m->m_flags & M_HASFCS) { /* * If the M_HASFCS is set by the driver we want to make sure * that we strip off the trailing FCS data before handing it * up the stack. */ m_adj(m, -ETHER_CRC_LEN); m->m_flags &= ~M_HASFCS; } return; } static mbuf_t bridge_pf_list_out(mbuf_t m, ifnet_t ifp, uint32_t sc_filter_flags) { mbuf_t next_packet = NULL; mblist ret; mblist_init(&ret); for (mbuf_ref_t scan = m; scan != NULL; scan = next_packet) { next_packet = scan->m_nextpkt; /* remove packet from list, and pass through PF */ scan->m_nextpkt = NULL; bridge_pf(&scan, ifp, sc_filter_flags, false); if (scan != NULL) { /* add packet back to the list */ mblist_append(&ret, scan); } } return ret.head; } static inline bool bridge_check_frame_header(struct bridge_softc * sc, ifnet_t ifp, mbuf_t m) { bool included = false; char * __single header; size_t header_length = 0; header = m->m_pkthdr.pkt_hdr; if (header >= (char *)mbuf_datastart(m) && header <= mtod(m, char *)) { header_length = mtod(m, char *) - header; if (header_length >= ETHER_HDR_LEN) { included = true; } } BRIDGE_LOG(LOG_DEBUG, BR_DBGF_INPUT, "%s from %s m 0x%llx data 0x%llx frame 0x%llx %s " "header length %lu", sc->sc_ifp->if_xname, ifp->if_xname, (uint64_t)VM_KERNEL_ADDRPERM(m), (uint64_t)VM_KERNEL_ADDRPERM(mtod(m, void *)), (uint64_t)VM_KERNEL_ADDRPERM(header), included ? "inside" : "outside", header_length); if (!included) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_INPUT, "%s: frame_header outside mbuf", ifp->if_xname); } return included; } mbuf_t bridge_early_input(struct ifnet *ifp, mbuf_t in_list, u_int32_t cnt) { struct ether_header eh; mblist list; volatile bool list_is_promisc; int n_lists = 0; bool need_pf; mbuf_t next_packet = NULL; mblist ret; struct bridge_softc * __single sc = ifp->if_bridge; uint32_t sc_filter_flags; BRIDGE_LOG(LOG_DEBUG, BR_DBGF_INPUT_LIST, "(%s): count %u", ifp->if_xname, cnt); sc_filter_flags = sc->sc_filter_flags; need_pf = (sc_filter_flags & IFBF_FILT_MEMBER) != 0 && PF_IS_ENABLED; /* form sublists with the same ethernet header */ mblist_init(&list); mblist_init(&ret); for (mbuf_ref_t scan = in_list; scan != NULL; scan = next_packet) { struct ether_header * eh_p; volatile bool is_promisc; mblist resid; /* take it out of the list */ next_packet = scan->m_nextpkt; scan->m_nextpkt = NULL; /* don't loop the packet */ if ((scan->m_flags & M_PROTO1) != 0) { mblist_append(&ret, scan); continue; } /* Check if this mbuf looks valid */ MBUF_INPUT_CHECK(scan, ifp); /* if the frame header isn't in the first mbuf, ignore */ if (!bridge_check_frame_header(sc, ifp, scan)) { mblist_append(&ret, scan); continue; } /* set start back to include ether header */ _mbuf_adjust_pkthdr_and_data(scan, -ETHER_HDR_LEN); eh_p = mtod(scan, struct ether_header *); update_mbuf_flags(ifp, scan, eh_p); /* pass through PF if required */ if (need_pf) { bridge_pf(&scan, ifp, sc_filter_flags, true); if (scan == NULL) { continue; } /* `eh_p` could have changed */ eh_p = mtod(scan, struct ether_header *); } is_promisc = get_and_clear_promisc(scan); if (list.head == NULL) { /* start a new list */ mblist_append(&list, scan); bcopy(eh_p, &eh, sizeof(eh)); list_is_promisc = is_promisc; } else if (bcmp(eh_p, &eh, sizeof(eh)) != 0) { n_lists++; BRIDGE_LOG(LOG_DEBUG, BR_DBGF_INPUT_LIST, "(%s): sublist %u pkts %u", ifp->if_xname, n_lists, list.count); if (BRIDGE_DBGF_ENABLED(BR_DBGF_INPUT_LIST)) { brlog_ether_header(&eh); } resid = bridge_input_list(sc, ifp, &eh, list, list_is_promisc); if (resid.head != NULL) { /* add to the packets to be returned */ mblist_append_list(&ret, resid); } /* start new list */ mblist_init(&list); mblist_append(&list, scan); list_is_promisc = is_promisc; bcopy(eh_p, &eh, sizeof(eh)); } else { mblist_append(&list, scan); VERIFY(is_promisc == list_is_promisc); } if (next_packet == NULL) { /* last list */ n_lists++; BRIDGE_LOG(LOG_DEBUG, BR_DBGF_INPUT_LIST, "(%s): sublist %u pkts %u", ifp->if_xname, n_lists, list.count); if (BRIDGE_DBGF_ENABLED(BR_DBGF_INPUT_LIST)) { brlog_ether_header(&eh); } resid = bridge_input_list(sc, ifp, &eh, list, list_is_promisc); if (resid.head != NULL) { /* add to the packets to be returned */ mblist_append_list(&ret, resid); } } } return ret.head; } /* * Copyright (C) 2014, Stefano Garzarella - Universita` di Pisa. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * XXX-ste: Maybe this function must be moved into kern/uipc_mbuf.c * * Create a queue of packets/segments which fit the given mss + hdr_len. * m0 points to mbuf chain to be segmented. * This function splits the payload (m0-> m_pkthdr.len - hdr_len) * into segments of length MSS bytes and then copy the first hdr_len bytes * from m0 at the top of each segment. * If hdr2_buf is not NULL (hdr2_len is the buf length), it is copied * in each segment after the first hdr_len bytes * * Return the new queue with the segments on success, NULL on failure. * (the mbuf queue is freed in this case). */ static mblist m_seg(struct mbuf *m0, int hdr_len, int mss, char * hdr2_buf __sized_by_or_null(hdr2_len), int hdr2_len) { int off = 0, n, firstlen; struct mbuf *mseg; int total_len = m0->m_pkthdr.len; mblist ret; mblist_init(&ret); mblist_append(&ret, m0); /* * Segmentation useless */ if (total_len <= hdr_len + mss) { n = 1; goto done; } if (hdr2_buf == NULL || hdr2_len <= 0) { hdr2_buf = NULL; hdr2_len = 0; } off = hdr_len + mss; firstlen = mss; /* first segment stored in the original mbuf */ ret.bytes = off; for (n = 1; off < total_len; off += mss, n++) { struct mbuf *m; /* * Copy the header from the original packet * and create a new mbuf chain */ if (MHLEN < hdr_len) { m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); } else { m = m_gethdr(M_NOWAIT, MT_DATA); } if (m == NULL) { #ifdef GSO_DEBUG D("MGETHDR error\n"); #endif goto err; } m_copydata(m0, 0, hdr_len, mtod(m, caddr_t)); m->m_len = hdr_len; /* * if the optional header is present, copy it */ if (hdr2_buf != NULL) { m_copyback(m, hdr_len, hdr2_len, hdr2_buf); } m->m_flags |= (m0->m_flags & M_COPYFLAGS); if (off + mss >= total_len) { /* last segment */ mss = total_len - off; } /* * Copy the payload from original packet */ mseg = m_copym(m0, off, mss, M_NOWAIT); if (mseg == NULL) { m_freem(m); #ifdef GSO_DEBUG D("m_copym error\n"); #endif goto err; } m_cat(m, mseg); m->m_pkthdr.len = hdr_len + hdr2_len + mss; m->m_pkthdr.rcvif = m0->m_pkthdr.rcvif; /* * Copy the checksum flags and data (in_cksum() need this) */ m->m_pkthdr.csum_flags = m0->m_pkthdr.csum_flags; m->m_pkthdr.csum_data = m0->m_pkthdr.csum_data; m->m_pkthdr.tso_segsz = m0->m_pkthdr.tso_segsz; mblist_append(&ret, m); } /* * Update first segment. * If the optional header is present, is necessary * to insert it into the first segment. */ if (hdr2_buf == NULL) { m_adj(m0, hdr_len + firstlen - total_len); m0->m_pkthdr.len = hdr_len + firstlen; } else { mseg = m_copym(m0, hdr_len, firstlen, M_NOWAIT); if (mseg == NULL) { #ifdef GSO_DEBUG D("m_copym error\n"); #endif goto err; } m_adj(m0, hdr_len - total_len); m_copyback(m0, hdr_len, hdr2_len, hdr2_buf); m_cat(m0, mseg); m0->m_pkthdr.len = hdr_len + hdr2_len + firstlen; } done: return ret; err: if (ret.head != NULL) { m_freem_list(ret.head); mblist_init(&ret); } return ret; } /* * Wrappers of IPv4 checksum functions */ static inline void gso_ipv4_data_cksum(struct mbuf *m, struct ip *ip, int mac_hlen) { m->m_data += mac_hlen; m->m_len -= mac_hlen; m->m_pkthdr.len -= mac_hlen; #if __FreeBSD_version < 1000000 ip->ip_len = ntohs(ip->ip_len); /* needed for in_delayed_cksum() */ #endif in_delayed_cksum(m); #if __FreeBSD_version < 1000000 ip->ip_len = htons(ip->ip_len); #endif m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; m->m_len += mac_hlen; m->m_pkthdr.len += mac_hlen; m->m_data -= mac_hlen; } static inline void gso_ipv4_hdr_cksum(struct mbuf *m, struct ip *ip, int mac_hlen, int ip_hlen) { m->m_data += mac_hlen; ip->ip_sum = in_cksum(m, ip_hlen); m->m_pkthdr.csum_flags &= ~CSUM_IP; m->m_data -= mac_hlen; } /* * Structure that contains the state during the TCP segmentation */ struct gso_ip_tcp_state { void (*update) (struct gso_ip_tcp_state*, struct mbuf*); void (*internal) (struct gso_ip_tcp_state*, struct mbuf*); u_int ip_m0_len; uint8_t * __counted_by(ip_m0_len) hdr; struct tcphdr *tcp; int mac_hlen; int ip_hlen; int tcp_hlen; int hlen; int pay_len; int sw_csum; uint32_t tcp_seq; uint16_t ip_id; boolean_t is_tx; }; /* * Update the pointers to TCP and IPv4 headers */ static inline void gso_ipv4_tcp_update(struct gso_ip_tcp_state *state, struct mbuf *m) { state->hdr = mtodo(m, state->mac_hlen); state->ip_m0_len = m->m_len - state->mac_hlen; state->ip_hlen = state->ip_hlen; state->tcp = (struct tcphdr *)(state->hdr + state->ip_hlen); state->pay_len = m->m_pkthdr.len - state->hlen; } /* * Set properly the TCP and IPv4 headers */ static inline void gso_ipv4_tcp_internal(struct gso_ip_tcp_state *state, struct mbuf *m) { struct ip *ip; /* * Update IP header */ ip = (struct ip *)state->hdr; ip->ip_id = htons((state->ip_id)++); ip->ip_len = htons(m->m_pkthdr.len - state->mac_hlen); /* * TCP Checksum */ state->tcp->th_sum = 0; state->tcp->th_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, htons(state->tcp_hlen + IPPROTO_TCP + state->pay_len)); /* * Checksum HW not supported (TCP) */ if (state->sw_csum & CSUM_DELAY_DATA) { gso_ipv4_data_cksum(m, ip, state->mac_hlen); } state->tcp_seq += state->pay_len; /* * IP Checksum */ ip->ip_sum = 0; /* * Checksum HW not supported (IP) */ if (state->sw_csum & CSUM_IP) { gso_ipv4_hdr_cksum(m, ip, state->mac_hlen, state->ip_hlen); } } /* * Updates the pointers to TCP and IPv6 headers */ static inline void gso_ipv6_tcp_update(struct gso_ip_tcp_state *state, struct mbuf *m) { state->hdr = mtodo(m, state->mac_hlen); state->ip_m0_len = m->m_len - state->mac_hlen; state->ip_hlen = state->ip_hlen; state->tcp = (struct tcphdr *)(state->hdr + state->ip_hlen); state->pay_len = m->m_pkthdr.len - state->hlen; } /* * Sets properly the TCP and IPv6 headers */ static inline void gso_ipv6_tcp_internal(struct gso_ip_tcp_state *state, struct mbuf *m) { struct ip6_hdr *ip6; ip6 = (struct ip6_hdr *)state->hdr; ip6->ip6_plen = htons(m->m_pkthdr.len - state->mac_hlen - state->ip_hlen); /* * TCP Checksum */ state->tcp->th_sum = 0; state->tcp->th_sum = in6_pseudo(&ip6->ip6_src, &ip6->ip6_dst, htonl(state->tcp_hlen + state->pay_len + IPPROTO_TCP)); /* * Checksum HW not supported (TCP) */ if (state->sw_csum & CSUM_DELAY_IPV6_DATA) { (void)in6_finalize_cksum(m, state->mac_hlen, -1, -1, state->sw_csum); m->m_pkthdr.csum_flags &= ~CSUM_DELAY_IPV6_DATA; } state->tcp_seq += state->pay_len; } /* * Init the state during the TCP segmentation */ static void gso_ip_tcp_init_state(struct gso_ip_tcp_state *state, struct ifnet *ifp, bool is_ipv4, int mac_hlen, int ip_hlen, uint8_t *__counted_by(ip_m0_len) ip_hdr, u_int ip_m0_len, struct tcphdr * tcp_hdr) { #pragma unused(ifp) state->hdr = ip_hdr; state->ip_m0_len = ip_m0_len; state->ip_hlen = ip_hlen; state->tcp = tcp_hdr; if (is_ipv4) { state->ip_id = ntohs(((struct ip *)state->hdr)->ip_id); state->update = gso_ipv4_tcp_update; state->internal = gso_ipv4_tcp_internal; state->sw_csum = CSUM_DELAY_DATA | CSUM_IP; /* XXX */ } else { state->update = gso_ipv6_tcp_update; state->internal = gso_ipv6_tcp_internal; state->sw_csum = CSUM_DELAY_IPV6_DATA; /* XXX */ } state->mac_hlen = mac_hlen; state->tcp_hlen = state->tcp->th_off << 2; state->hlen = mac_hlen + ip_hlen + state->tcp_hlen; state->tcp_seq = ntohl(state->tcp->th_seq); //state->sw_csum = m->m_pkthdr.csum_flags & ~IF_HWASSIST_CSUM_FLAGS(ifp->if_hwassist); return; } /* * GSO on TCP/IP (v4 or v6) * * Segment the given mbuf and return the list of packets. * */ static mblist gso_ip_tcp(ifnet_t ifp, mbuf_t m0, struct gso_ip_tcp_state *state, bool is_tx) { struct mbuf *m; int orig_mss; int mss = 0; #ifdef GSO_STATS int total_len = m0->m_pkthdr.len; #endif /* GSO_STATS */ mblist seg; bool tso_with_gso = false; orig_mss = mss = _mbuf_get_tso_mss(m0); if (mss == 0 && !is_tx) { uint8_t seg_cnt = m0->m_pkthdr.rx_seg_cnt; if (seg_cnt != 0) { uint32_t hdr_len; uint32_t len; /* approximate the MSS using LRO seg cnt */ hdr_len = state->ip_hlen + state->tcp_hlen; len = mbuf_pkthdr_len(m0) - hdr_len - ETHER_HDR_LEN; mss = len / seg_cnt; m0->m_pkthdr.rx_seg_cnt = 0; BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "%s: mss %d = len %d / seg cnt %d", ifp->if_xname, mss, len, seg_cnt); } } if (mss == 0) { /* hack: we don't have the actual MSS */ u_int reduce_mss; reduce_mss = is_tx ? if_bridge_tso_reduce_mss_tx : if_bridge_tso_reduce_mss_forwarding; mss = ifp->if_mtu - state->ip_hlen - state->tcp_hlen - reduce_mss; assert(mss > 0); } else if (is_tx) { bool is_ipv4; bool do_tso = true; if (TSO_IPV4_OK(ifp, m0)) { is_ipv4 = true; } else if (TSO_IPV6_OK(ifp, m0)) { is_ipv4 = false; } else { do_tso = false; } if (do_tso) { /* TSO with GSO */ uint32_t if_tso_max; if_tso_max = get_if_tso_mtu(ifp, is_ipv4); mss = if_tso_max - state->ip_hlen - state->tcp_hlen - ETHER_HDR_LEN; tso_with_gso = true; } } if (!tso_with_gso) { /* clear TSO flags */ m0->m_pkthdr.csum_flags &= ~_TSO_CSUM; } seg = m_seg(m0, state->hlen, mss, 0, 0); if (seg.head == NULL || seg.head->m_nextpkt == NULL) { return seg; } if (tso_with_gso) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "%s TX gso size %d mss %d nsegs %d", ifp->if_xname, mss, orig_mss, seg.count); } else { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "%s %s mss %d nsegs %d", ifp->if_xname, is_tx ? "TX" : "RX", mss, seg.count); } #ifdef GSO_STATS GSOSTAT_SET_MAX(tcp.gsos_max_mss, mss); GSOSTAT_SET_MIN(tcp.gsos_min_mss, mss); GSOSTAT_ADD(tcp.gsos_osegments, seg.count); #endif /* GSO_STATS */ /* first pkt */ VERIFY(seg.head == m0); m = m0; state->update(state, m); do { state->tcp->th_flags &= ~(TH_FIN | TH_PUSH); state->internal(state, m); m = m->m_nextpkt; state->update(state, m); state->tcp->th_flags &= ~TH_CWR; state->tcp->th_seq = htonl(state->tcp_seq); } while (m->m_nextpkt); /* last pkt */ state->internal(state, m); #ifdef GSO_STATS if (!error) { GSOSTAT_INC(tcp.gsos_segmented); GSOSTAT_SET_MAX(tcp.gsos_maxsegmented, total_len); GSOSTAT_SET_MIN(tcp.gsos_minsegmented, total_len); GSOSTAT_ADD(tcp.gsos_totalbyteseg, total_len); } #endif /* GSO_STATS */ return seg; } /* * GSO for TCP/IPv[46] */ static mblist gso_tcp_with_info(ifnet_t ifp, mbuf_t m, ip_packet_info_t info_p, u_int mac_hlen, bool is_ipv4, bool is_tx) { uint32_t csum_flags; struct gso_ip_tcp_state state; struct tcphdr *tcp; assert(info_p->ip_proto_hdr != NULL); tcp = (struct tcphdr *)(void *)info_p->ip_proto_hdr; gso_ip_tcp_init_state(&state, ifp, is_ipv4, mac_hlen, info_p->ip_hlen + info_p->ip_opt_len, info_p->ip_hdr, info_p->ip_m0_len, tcp); csum_flags = is_ipv4 ? CSUM_DELAY_DATA : CSUM_DELAY_IPV6_DATA; /* XXX */ m->m_pkthdr.csum_flags |= csum_flags; m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum); return gso_ip_tcp(ifp, m, &state, is_tx); } static mblist gso_tcp(ifnet_t ifp, mbuf_t m, u_int mac_hlen, bool is_ipv4, bool is_tx) { int error; ip_packet_info info; struct bripstats stats; /* XXX ignored */ mblist ret; error = bridge_get_tcp_header(&m, mac_hlen, is_ipv4, &info, &stats); if (error != 0) { BRIDGE_LOG(LOG_DEBUG, BR_DBGF_CHECKSUM, "%s bridge_get_tcp_header failed %d (%s)", ifp->if_xname, error, is_tx ? "TX" : "RX"); if (m != NULL) { m_drop(m, DROPTAP_FLAG_DIR_IN, DROP_REASON_BRIDGE_CHECKSUM, NULL, 0); m = NULL; } goto no_segment; } if (info.ip_proto_hdr == NULL) { /* not actually a TCP packet, no segmentation */ goto no_segment; } if (!is_tx && ip_packet_info_dst_is_our_ip(&info, ifp->if_index)) { goto no_segment; } return gso_tcp_with_info(ifp, m, &info, mac_hlen, is_ipv4, is_tx); no_segment: mblist_init(&ret); if (m != NULL) { mblist_append(&ret, m); } return ret; } |