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5022 5023 5024 5025 5026 5027 5028 5029 5030 5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050 5051 5052 5053 5054 5055 5056 5057 5058 5059 5060 5061 5062 5063 5064 5065 5066 5067 5068 5069 5070 5071 5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082 5083 5084 5085 5086 5087 5088 5089 5090 5091 5092 5093 5094 5095 5096 5097 5098 5099 5100 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116 5117 5118 5119 5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131 5132 5133 5134 5135 5136 5137 5138 | /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */ /* * Copyright (c) 2004-2010 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@ */ /* * 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). */ #include <sys/cdefs.h> //__FBSDID("$FreeBSD$"); //#include "opt_inet.h" //#include "opt_inet6.h" //#include "opt_carp.h" #define BRIDGE_DEBUG 1 #ifndef BRIDGE_DEBUG #define BRIDGE_DEBUG 0 #endif /* BRIDGE_DEBUG */ #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/ctype.h> /* string functions */ #include <sys/kernel.h> #include <sys/random.h> #include <sys/syslog.h> #include <sys/sysctl.h> //#include <vm/uma.h> //#include <sys/module.h> //#include <sys/priv.h> #include <sys/proc.h> #include <sys/lock.h> //#include <sys/mutex.h> #include <sys/mcache.h> #include <sys/kauth.h> #include <libkern/libkern.h> #include <kern/zalloc.h> #if NBPFILTER > 0 #include <net/bpf.h> #endif #include <net/if.h> //#include <net/if_clone.h> #include <net/if_dl.h> #include <net/if_types.h> #include <net/if_var.h> //#include <net/pfil.h> #include <netinet/in.h> /* for struct arpcom */ #include <netinet/in_systm.h> #include <netinet/in_var.h> #include <netinet/ip.h> #include <netinet/ip_var.h> #ifdef INET6 #include <netinet/ip6.h> #include <netinet6/ip6_var.h> #endif #ifdef DEV_CARP #include <netinet/ip_carp.h> #endif //#include <machine/in_cksum.h> #include <netinet/if_ether.h> /* for struct arpcom */ #include <net/bridgestp.h> #include <net/if_bridgevar.h> #include <net/if_llc.h> #include <net/if_vlan_var.h> #include <net/if_ether.h> #include <net/dlil.h> #include <net/kpi_interfacefilter.h> #include <net/route.h> #ifdef PFIL_HOOKS #include <netinet/ip_fw2.h> #include <netinet/ip_dummynet.h> #endif /* PFIL_HOOKS */ #if BRIDGE_DEBUG #define BR_LCKDBG_MAX 4 #define BRIDGE_LOCK(_sc) bridge_lock(_sc) #define BRIDGE_UNLOCK(_sc) bridge_unlock(_sc) #define BRIDGE_LOCK_ASSERT(_sc) lck_mtx_assert((_sc)->sc_mtx, LCK_MTX_ASSERT_OWNED) #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_DEBUG */ #define BRIDGE_LOCK(_sc) lck_mtx_lock((_sc)->sc_mtx) #define BRIDGE_UNLOCK(_sc) lck_mtx_unlock((_sc)->sc_mtx) #define BRIDGE_LOCK_ASSERT(_sc) lck_mtx_assert((_sc)->sc_mtx, LCK_MTX_ASSERT_OWNED) #define BRIDGE_LOCK2REF(_sc, _err) do { \ lck_mtx_assert((_sc)->sc_mtx, LCK_MTX_ASSERT_OWNED); \ if ((_sc)->sc_iflist_xcnt > 0) \ (_err) = EBUSY; \ else \ (_sc)->sc_iflist_ref++; \ lck_mtx_unlock((_sc)->sc_mtx); \ } while (0) #define BRIDGE_UNREF(_sc) do { \ lck_mtx_lock((_sc)->sc_mtx); \ (_sc)->sc_iflist_ref--; \ if (((_sc)->sc_iflist_xcnt > 0) && ((_sc)->sc_iflist_ref == 0)) { \ lck_mtx_unlock((_sc)->sc_mtx); \ wakeup(&(_sc)->sc_cv); \ } else \ lck_mtx_unlock((_sc)->sc_mtx); \ } while (0) #define BRIDGE_XLOCK(_sc) do { \ lck_mtx_assert((_sc)->sc_mtx, LCK_MTX_ASSERT_OWNED); \ (_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 { \ lck_mtx_assert((_sc)->sc_mtx, LCK_MTX_ASSERT_OWNED); \ (_sc)->sc_iflist_xcnt--; \ } while (0) #endif /* BRIDGE_DEBUG */ #if NBPFILTER > 0 #define BRIDGE_BPF_MTAP_INPUT(sc, m) \ if (sc->sc_bpf_input) \ bridge_bpf_input(sc->sc_ifp, m) #else /* NBPFILTER */ #define BRIDGE_BPF_MTAP_INPUT(ifp, m) #endif /* NBPFILTER */ /* * Size of the route hash table. Must be a power of two. */ /* APPLE MODIFICATION - per Wasabi performance improvement, change the hash table size */ #if 0 #ifndef BRIDGE_RTHASH_SIZE #define BRIDGE_RTHASH_SIZE 1024 #endif #else #ifndef BRIDGE_RTHASH_SIZE #define BRIDGE_RTHASH_SIZE 256 #endif #endif /* APPLE MODIFICATION - support for HW checksums */ #if APPLE_BRIDGE_HWCKSUM_SUPPORT #include <netinet/udp.h> #include <netinet/tcp.h> #endif #define BRIDGE_RTHASH_MASK (BRIDGE_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 /* * List of capabilities to possibly mask on the member interface. */ #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|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_flags; /* 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; char bif_promisc; /* promiscuous mode set */ char bif_proto_attached; /* protocol attached */ char bif_filter_attached; /* interface filter attached */ }; /* * 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 /* * Software state for each bridge. */ struct bridge_softc { struct ifnet *sc_ifp; /* make this an interface */ LIST_ENTRY(bridge_softc) sc_list; lck_mtx_t *sc_mtx; 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 */ LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ uint32_t sc_rthash_key; /* key for hash */ TAILQ_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ struct bstp_state sc_stp; /* STP state */ uint32_t sc_brtexceeded; /* # of cache drops */ uint32_t sc_filter_flags; /* ipf and flags */ char sc_if_xname[IFNAMSIZ]; bpf_packet_func sc_bpf_input; bpf_packet_func sc_bpf_output; u_int32_t sc_flags; #if BRIDGE_DEBUG void *lock_lr[BR_LCKDBG_MAX]; /* locking calling history */ int next_lock_lr; void *unlock_lr[BR_LCKDBG_MAX]; /* unlocking caller history */ int next_unlock_lr; #endif /* BRIDGE_DEBUG */ }; #define SCF_DETACHING 0x1 static lck_mtx_t *bridge_list_mtx; //eventhandler_tag bridge_detach_cookie = NULL; int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; static zone_t bridge_rtnode_pool = NULL; 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, void *); #if HAS_IF_CAP static void bridge_mutecaps(struct bridge_softc *); static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, int); #endif __private_extern__ void bridge_ifdetach(struct bridge_iflist *, struct ifnet *); static int bridge_init(struct ifnet *); #if HAS_BRIDGE_DUMMYNET static void bridge_dummynet(struct mbuf *, struct ifnet *); #endif static void bridge_stop(struct ifnet *, int); static errno_t bridge_start(struct ifnet *, struct mbuf *); __private_extern__ errno_t bridge_input(struct ifnet *, struct mbuf *, void *); #if BRIDGE_MEMBER_OUT_FILTER static errno_t bridge_iff_output(void *, ifnet_t , protocol_family_t , mbuf_t *); static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, struct rtentry *); #endif static void bridge_enqueue(struct bridge_softc *, struct ifnet *, struct mbuf *); static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, struct mbuf *m); static void bridge_timer(void *); static void bridge_broadcast(struct bridge_softc *, struct ifnet *, struct mbuf *, int); static void bridge_span(struct bridge_softc *, struct mbuf *); static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, uint16_t, struct bridge_iflist *, int, uint8_t); static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 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 *, uint16_t); static int bridge_rtable_init(struct bridge_softc *); static void bridge_rtable_fini(struct bridge_softc *); static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, const uint8_t *, uint16_t); static int bridge_rtnode_insert(struct bridge_softc *, struct bridge_rtnode *); static void bridge_rtnode_destroy(struct bridge_softc *, struct bridge_rtnode *); static void bridge_rtable_expire(struct ifnet *, int); static void bridge_state_change(struct ifnet *, int); static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, const char *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 *, int); static void bridge_delete_span(struct bridge_softc *, struct bridge_iflist *); static int bridge_ioctl_add(struct bridge_softc *, void *); static int bridge_ioctl_del(struct bridge_softc *, void *); static int bridge_ioctl_gifflags(struct bridge_softc *, void *); static int bridge_ioctl_sifflags(struct bridge_softc *, void *); static int bridge_ioctl_scache(struct bridge_softc *, void *); static int bridge_ioctl_gcache(struct bridge_softc *, void *); static int bridge_ioctl_gifs32(struct bridge_softc *, void *); static int bridge_ioctl_gifs64(struct bridge_softc *, void *); static int bridge_ioctl_rts32(struct bridge_softc *, void *); static int bridge_ioctl_rts64(struct bridge_softc *, void *); static int bridge_ioctl_saddr32(struct bridge_softc *, void *); static int bridge_ioctl_saddr64(struct bridge_softc *, void *); static int bridge_ioctl_sto(struct bridge_softc *, void *); static int bridge_ioctl_gto(struct bridge_softc *, void *); static int bridge_ioctl_daddr32(struct bridge_softc *, void *); static int bridge_ioctl_daddr64(struct bridge_softc *, void *); static int bridge_ioctl_flush(struct bridge_softc *, void *); static int bridge_ioctl_gpri(struct bridge_softc *, void *); static int bridge_ioctl_spri(struct bridge_softc *, void *); static int bridge_ioctl_ght(struct bridge_softc *, void *); static int bridge_ioctl_sht(struct bridge_softc *, void *); static int bridge_ioctl_gfd(struct bridge_softc *, void *); static int bridge_ioctl_sfd(struct bridge_softc *, void *); static int bridge_ioctl_gma(struct bridge_softc *, void *); static int bridge_ioctl_sma(struct bridge_softc *, void *); static int bridge_ioctl_sifprio(struct bridge_softc *, void *); static int bridge_ioctl_sifcost(struct bridge_softc *, void *); static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); static int bridge_ioctl_addspan(struct bridge_softc *, void *); static int bridge_ioctl_delspan(struct bridge_softc *, void *); static int bridge_ioctl_gbparam32(struct bridge_softc *, void *); static int bridge_ioctl_gbparam64(struct bridge_softc *, void *); static int bridge_ioctl_grte(struct bridge_softc *, void *); static int bridge_ioctl_gifsstp32(struct bridge_softc *, void *); static int bridge_ioctl_gifsstp64(struct bridge_softc *, void *); static int bridge_ioctl_sproto(struct bridge_softc *, void *); static int bridge_ioctl_stxhc(struct bridge_softc *, void *); static int bridge_ioctl_purge(struct bridge_softc *sc, void *arg); static int bridge_ioctl_gfilt(struct bridge_softc *, void *); static int bridge_ioctl_sfilt(struct bridge_softc *, void *); #ifdef PFIL_HOOKS static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, int); static int bridge_ip_checkbasic(struct mbuf **mp); #ifdef INET6 static int bridge_ip6_checkbasic(struct mbuf **mp); #endif /* INET6 */ static int bridge_fragment(struct ifnet *, struct mbuf *, struct ether_header *, int, struct llc *); #endif /* PFIL_HOOKS */ static errno_t bridge_set_bpf_tap(ifnet_t ifn, bpf_tap_mode mode, bpf_packet_func bpf_callback); __private_extern__ errno_t bridge_bpf_input(ifnet_t ifp, struct mbuf *m); __private_extern__ errno_t bridge_bpf_output(ifnet_t ifp, struct mbuf *m); static void bridge_detach(ifnet_t ifp); #define m_copypacket(m, how) m_copym(m, 0, M_COPYALL, how) /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ #define VLANTAGOF(_m) 0 static struct bstp_cb_ops bridge_ops = { .bcb_state = bridge_state_change, .bcb_rtage = bridge_rtable_expire }; SYSCTL_DECL(_net_link); SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); #if defined(PFIL_HOOKS) static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */ static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */ static int pfil_member = 1; /* run pfil hooks on the member interface */ static int pfil_ipfw = 0; /* layer2 filter with ipfw */ static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */ static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for locally destined packets */ SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW, &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled"); SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW, &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2"); SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW, &pfil_bridge, 0, "Packet filter on the bridge interface"); SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW, &pfil_member, 0, "Packet filter on the member interface"); SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW, &pfil_local_phys, 0, "Packet filter on the physical interface for locally destined packets"); #endif /* PFIL_HOOKS */ 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"); struct bridge_control { int (*bc_func)(struct bridge_softc *, void *); 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[] = { { bridge_ioctl_add, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_del, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_gifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_COPYOUT }, { bridge_ioctl_sifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_scache, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_gcache, sizeof(struct ifbrparam), BC_F_COPYOUT }, { bridge_ioctl_gifs32, sizeof(struct ifbifconf32), BC_F_COPYIN|BC_F_COPYOUT }, { bridge_ioctl_rts32, sizeof(struct ifbaconf32), BC_F_COPYIN|BC_F_COPYOUT }, { bridge_ioctl_saddr32, sizeof(struct ifbareq32), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_sto, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_gto, sizeof(struct ifbrparam), BC_F_COPYOUT }, { bridge_ioctl_daddr32, sizeof(struct ifbareq32), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_flush, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_gpri, sizeof(struct ifbrparam), BC_F_COPYOUT }, { bridge_ioctl_spri, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_ght, sizeof(struct ifbrparam), BC_F_COPYOUT }, { bridge_ioctl_sht, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_gfd, sizeof(struct ifbrparam), BC_F_COPYOUT }, { bridge_ioctl_sfd, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_gma, sizeof(struct ifbrparam), BC_F_COPYOUT }, { bridge_ioctl_sma, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_sifprio, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_sifcost, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_gfilt, sizeof(struct ifbrparam), BC_F_COPYOUT }, { bridge_ioctl_sfilt, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_purge, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_addspan, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_delspan, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_gbparam32, sizeof(struct ifbropreq32), BC_F_COPYOUT }, { bridge_ioctl_grte, sizeof(struct ifbrparam), BC_F_COPYOUT }, { bridge_ioctl_gifsstp32, sizeof(struct ifbpstpconf32), BC_F_COPYIN|BC_F_COPYOUT }, { bridge_ioctl_sproto, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_stxhc, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, }; static const struct bridge_control bridge_control_table64[] = { { bridge_ioctl_add, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_del, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_gifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_COPYOUT }, { bridge_ioctl_sifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_scache, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_gcache, sizeof(struct ifbrparam), BC_F_COPYOUT }, { bridge_ioctl_gifs64, sizeof(struct ifbifconf64), BC_F_COPYIN|BC_F_COPYOUT }, { bridge_ioctl_rts64, sizeof(struct ifbaconf64), BC_F_COPYIN|BC_F_COPYOUT }, { bridge_ioctl_saddr64, sizeof(struct ifbareq64), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_sto, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_gto, sizeof(struct ifbrparam), BC_F_COPYOUT }, { bridge_ioctl_daddr64, sizeof(struct ifbareq64), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_flush, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_gpri, sizeof(struct ifbrparam), BC_F_COPYOUT }, { bridge_ioctl_spri, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_ght, sizeof(struct ifbrparam), BC_F_COPYOUT }, { bridge_ioctl_sht, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_gfd, sizeof(struct ifbrparam), BC_F_COPYOUT }, { bridge_ioctl_sfd, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_gma, sizeof(struct ifbrparam), BC_F_COPYOUT }, { bridge_ioctl_sma, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_sifprio, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_sifcost, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_gfilt, sizeof(struct ifbrparam), BC_F_COPYOUT }, { bridge_ioctl_sfilt, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_purge, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_addspan, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_delspan, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_gbparam64, sizeof(struct ifbropreq64), BC_F_COPYOUT }, { bridge_ioctl_grte, sizeof(struct ifbrparam), BC_F_COPYOUT }, { bridge_ioctl_gifsstp64, sizeof(struct ifbpstpconf64), BC_F_COPYIN|BC_F_COPYOUT }, { bridge_ioctl_sproto, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_stxhc, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, }; 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); static lck_grp_t *bridge_lock_grp = NULL; static lck_attr_t *bridge_lock_attr = NULL; static if_clone_t bridge_cloner = NULL; __private_extern__ int _if_brige_debug = 0; SYSCTL_INT(_net_link_bridge, OID_AUTO, debug, CTLFLAG_RW, &_if_brige_debug, 0, "Bridge debug"); #if BRIDGE_DEBUG static void printf_ether_header(struct ether_header *eh); static void printf_mbuf_data(mbuf_t m, size_t offset, size_t len); static void printf_mbuf_pkthdr(mbuf_t m, const char *prefix, const char *suffix); static void printf_mbuf(mbuf_t m, const char *prefix, const char *suffix); static void link_print(struct sockaddr_dl * dl_p); 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 *); static void bridge_lock(struct bridge_softc *sc) { void *lr_saved = __builtin_return_address(0); lck_mtx_assert(sc->sc_mtx, LCK_MTX_ASSERT_NOTOWNED); lck_mtx_lock(sc->sc_mtx); 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) { void *lr_saved = __builtin_return_address(0); lck_mtx_assert(sc->sc_mtx, LCK_MTX_ASSERT_OWNED); sc->unlock_lr[sc->next_unlock_lr] = lr_saved; sc->next_unlock_lr = (sc->next_unlock_lr+1) % SO_LCKDBG_MAX; lck_mtx_unlock(sc->sc_mtx); } static int bridge_lock2ref(struct bridge_softc *sc) { int error = 0; void *lr_saved = __builtin_return_address(0); lck_mtx_assert(sc->sc_mtx, LCK_MTX_ASSERT_OWNED); 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; lck_mtx_unlock(sc->sc_mtx); return error; } static void bridge_unref(struct bridge_softc *sc) { void *lr_saved = __builtin_return_address(0); lck_mtx_assert(sc->sc_mtx, LCK_MTX_ASSERT_NOTOWNED); lck_mtx_lock(sc->sc_mtx); 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)) { lck_mtx_unlock(sc->sc_mtx); wakeup(&sc->sc_cv); } else lck_mtx_unlock(sc->sc_mtx); } static void bridge_xlock(struct bridge_softc *sc) { void *lr_saved = __builtin_return_address(0); lck_mtx_assert(sc->sc_mtx, LCK_MTX_ASSERT_OWNED); 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; } } static void bridge_xdrop(struct bridge_softc *sc) { lck_mtx_assert(sc->sc_mtx, LCK_MTX_ASSERT_OWNED); sc->sc_iflist_xcnt--; } void printf_mbuf_pkthdr(mbuf_t m, const char *prefix, const char *suffix) { if (m) printf("%spktlen: %u rcvif: %p header: %p nextpkt: %p%s", prefix ? prefix : "", (unsigned int)mbuf_pkthdr_len(m), mbuf_pkthdr_rcvif(m), mbuf_pkthdr_header(m), mbuf_nextpkt(m), suffix ? suffix : ""); else printf("%s<NULL>%s\n", prefix, suffix); } void printf_mbuf(mbuf_t m, const char *prefix, const char *suffix) { if (m) { printf("%s%p type: %u flags: 0x%x len: %u data: %p maxlen: %u datastart: %p next: %p%s", prefix ? prefix : "", m, mbuf_type(m), mbuf_flags(m), (unsigned int)mbuf_len(m), mbuf_data(m), (unsigned int)mbuf_maxlen(m), mbuf_datastart(m), mbuf_next(m), !suffix || (mbuf_flags(m) & MBUF_PKTHDR) ? "" : suffix); if ((mbuf_flags(m) & MBUF_PKTHDR)) printf_mbuf_pkthdr(m, " ", suffix); } else printf("%s<NULL>%s\n", prefix, suffix); } void printf_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; n = m; mlen = mbuf_len(n); ptr = mbuf_data(n); for (i = 0, j = 0; i < maxlen; i++, j++) { if (j >= mlen) { n = mbuf_next(n); if (n == 0) break; ptr = mbuf_data(n); mlen = mbuf_len(n); j = 0; } if (i >= offset) { printf("%02x%s", ptr[j], i % 2 ? " " : ""); } } return; } static void printf_ether_header(struct ether_header *eh) { printf("%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], eh->ether_type); } static void link_print(struct sockaddr_dl * dl_p) { int i; #if 1 printf("sdl len %d index %d family %d type 0x%x nlen %d alen %d" " slen %d addr ", dl_p->sdl_len, dl_p->sdl_index, dl_p->sdl_family, dl_p->sdl_type, dl_p->sdl_nlen, dl_p->sdl_alen, dl_p->sdl_slen); #endif for (i = 0; i < dl_p->sdl_alen; i++) printf("%s%x", i ? ":" : "", (CONST_LLADDR(dl_p))[i]); printf("\n"); return; } #endif /* BRIDGE_DEBUG */ /* * bridgeattach: * * Pseudo-device attach routine. */ __private_extern__ int bridgeattach(__unused int n) { int error; lck_grp_attr_t *lck_grp_attr = NULL; struct ifnet_clone_params ifnet_clone_params; bridge_rtnode_pool = zinit(sizeof(struct bridge_rtnode), 1024 * sizeof(struct bridge_rtnode), 0, "bridge_rtnode"); zone_change(bridge_rtnode_pool, Z_CALLERACCT, FALSE); lck_grp_attr = lck_grp_attr_alloc_init(); bridge_lock_grp = lck_grp_alloc_init("if_bridge", lck_grp_attr); bridge_lock_attr = lck_attr_alloc_init(); #if BRIDGE_DEBUG lck_attr_setdebug(bridge_lock_attr); #endif bridge_list_mtx = lck_mtx_alloc_init(bridge_lock_grp, bridge_lock_attr); // can free the attributes once we've allocated the group lock lck_grp_attr_free(lck_grp_attr); LIST_INIT(&bridge_list); bstp_sys_init(); ifnet_clone_params.ifc_name = "bridge"; ifnet_clone_params.ifc_create = bridge_clone_create; ifnet_clone_params.ifc_destroy = bridge_clone_destroy; error = ifnet_clone_attach(&ifnet_clone_params, &bridge_cloner); if (error != 0) printf("bridgeattach: ifnet_clone_attach failed %d\n", error); return error; } #if defined(PFIL_HOOKS) /* * handler for net.link.bridge.pfil_ipfw */ static int sysctl_pfil_ipfw SYSCTL_HANDLER_ARGS { #pragma unused(arg1,arg2) int enable = pfil_ipfw; int error; error = sysctl_handle_int(oidp, &enable, 0, req); enable = (enable) ? 1 : 0; if (enable != pfil_ipfw) { pfil_ipfw = enable; /* * Disable pfil so that ipfw doesnt run twice, if the user * really wants both then they can re-enable pfil_bridge and/or * pfil_member. Also allow non-ip packets as ipfw can filter by * layer2 type. */ if (pfil_ipfw) { pfil_onlyip = 0; pfil_bridge = 0; pfil_member = 0; } } return (error); } SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW, &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW"); #endif /* PFIL_HOOKS */ /* * bridge_clone_create: * * Create a new bridge instance. */ static int bridge_clone_create(struct if_clone *ifc, uint32_t unit, __unused void *params) { struct ifnet *ifp = NULL; struct bridge_softc *sc; u_char eaddr[6]; struct ifnet_init_params init_params; errno_t error = 0; uint32_t sdl_buffer[offsetof(struct sockaddr_dl, sdl_data) + IFNAMSIZ + ETHER_ADDR_LEN]; struct sockaddr_dl *sdl = (struct sockaddr_dl *)sdl_buffer; sc = _MALLOC(sizeof(*sc), M_DEVBUF, M_WAITOK); memset(sc, 0, sizeof(*sc)); sc->sc_mtx = lck_mtx_alloc_init(bridge_lock_grp, bridge_lock_attr); sc->sc_brtmax = BRIDGE_RTABLE_MAX; sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; sc->sc_filter_flags = IFBF_FILT_DEFAULT; #ifndef BRIDGE_IPF /* * For backwards compatibility with previous behaviour... * Switch off filtering on the bridge itself if BRIDGE_IPF is * not defined. */ sc->sc_filter_flags &= ~IFBF_FILT_USEIPF; #endif /* Initialize our routing table. */ error = bridge_rtable_init(sc); if (error != 0) { printf("bridge_clone_create: bridge_rtable_init failed %d\n", error); goto done; } TAILQ_INIT(&sc->sc_iflist); TAILQ_INIT(&sc->sc_spanlist); /* 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); memset(&init_params, 0, sizeof(struct ifnet_init_params)); init_params.uniqueid = sc->sc_if_xname; init_params.uniqueid_len = strlen(sc->sc_if_xname); init_params.name = ifc->ifc_name; init_params.unit = unit; init_params.family = IFNET_FAMILY_ETHERNET; init_params.type = IFT_BRIDGE; init_params.output = bridge_start; 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 = ether_frameout; init_params.softc = sc; init_params.ioctl = bridge_ioctl; init_params.set_bpf_tap = bridge_set_bpf_tap; init_params.detach = bridge_detach; init_params.broadcast_addr = etherbroadcastaddr; init_params.broadcast_len = ETHER_ADDR_LEN; error = ifnet_allocate(&init_params, &ifp); if (error != 0) { printf("bridge_clone_create: ifnet_allocate failed %d\n", error); goto done; } sc->sc_ifp = ifp; error = ifnet_set_mtu(ifp, ETHERMTU); if (error != 0) { printf("bridge_clone_create: ifnet_set_mtu failed %d\n", error); goto done; } error = ifnet_set_addrlen(ifp, ETHER_ADDR_LEN); if (error != 0) { printf("bridge_clone_create: ifnet_set_addrlen failed %d\n", error); goto done; } error = ifnet_set_baudrate(ifp, 10000000) ; // XXX: this is what IONetworking does if (error != 0) { printf("bridge_clone_create: ifnet_set_baudrate failed %d\n", error); goto done; } error = ifnet_set_hdrlen(ifp, ETHER_HDR_LEN); if (error != 0) { printf("bridge_clone_create: ifnet_set_hdrlen failed %d\n", error); goto done; } error = ifnet_set_flags(ifp, IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS | IFF_MULTICAST, 0xffff); if (error != 0) { printf("bridge_clone_create: ifnet_set_flags failed %d\n", error); goto done; } #if 0 /* * Generate a random 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. */ { int retry; for (retry = 1; retry != 0;) { struct ifnet *bifp; struct bridge_softc *sc2; read_random(eaddr, ETHER_ADDR_LEN); eaddr[0] &= ~1; /* clear multicast bit */ eaddr[0] |= 2; /* set the LAA bit */ retry = 0; lck_mtx_lock(bridge_list_mtx); LIST_FOREACH(sc2, &bridge_list, sc_list) { bifp = sc2->sc_ifp; if (memcmp(eaddr, ifnet_lladdr(bifp), ETHER_ADDR_LEN) == 0) retry = 1; } lck_mtx_unlock(bridge_list_mtx); } } #else /* * Generate a random ethernet address and use the private AC:DE:48 * OUI code. */ { uint32_t r; read_random(&r, sizeof(r)); eaddr[0] = 0xAC; eaddr[1] = 0xDE; eaddr[2] = 0x48; eaddr[3] = (r >> 0) & 0xffu; eaddr[4] = (r >> 8) & 0xffu; eaddr[5] = (r >> 16) & 0xffu; } #endif memset(sdl, 0, sizeof(sdl_buffer)); sdl->sdl_family = AF_LINK; sdl->sdl_nlen = strlen(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), eaddr, ETHER_ADDR_LEN); #if BRIDGE_DEBUG link_print(sdl); #endif error = ifnet_attach(ifp, NULL); if (error != 0) { printf("bridge_clone_create: ifnet_attach failed %d\n", error); goto done; } error = ifnet_set_lladdr_and_type(ifp, eaddr, ETHER_ADDR_LEN, IFT_ETHER); if (error != 0) { printf("bridge_clone_create: ifnet_set_lladdr_and_type failed %d\n", error); goto done; } #if APPLE_BRIDGE_HWCKSUM_SUPPORT /* * APPLE MODIFICATION - our bridge can support HW checksums * (useful if underlying interfaces support them) on TX, * RX is not that interesting, since the stack just looks to * see if the packet has been checksummed already (I think) * but we might as well indicate we support it */ ifp->if_capabilities = IFCAP_CSUM_IPv4_Tx | IFCAP_CSUM_TCPv4_Tx | IFCAP_CSUM_UDPv4_Tx | IFCAP_CSUM_IPv4_Rx | IFCAP_CSUM_TCPv4_Rx | IFCAP_CSUM_UDPv4_Rx ; #endif bstp_attach(&sc->sc_stp, &bridge_ops); 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) { printf("bridge_clone_create failed error %d\n", error); /* Cleanup TBD */ } return error; } /* * bridge_clone_destroy: * * Destroy a bridge instance. */ static int bridge_clone_destroy(struct ifnet *ifp) { struct bridge_softc *sc = ifp->if_softc; struct bridge_iflist *bif; errno_t error; BRIDGE_LOCK(sc); if ((sc->sc_flags & SCF_DETACHING)) { BRIDGE_UNLOCK(sc); return 0; } sc->sc_flags |= SCF_DETACHING; bridge_stop(ifp, 1); error = ifnet_set_flags(ifp, 0, IFF_UP); if (error != 0) { printf("bridge_clone_destroy: ifnet_set_flags failed %d\n", error); } while ((bif = TAILQ_FIRST(&sc->sc_iflist)) != NULL) bridge_delete_member(sc, bif, 0); while ((bif = TAILQ_FIRST(&sc->sc_spanlist)) != NULL) { bridge_delete_span(sc, bif); } BRIDGE_UNLOCK(sc); error = ifnet_detach(ifp); if (error != 0) { panic("bridge_clone_destroy: ifnet_detach(%p) failed %d\n", ifp, error); if ((sc = (struct bridge_softc *)ifnet_softc(ifp)) != NULL) { BRIDGE_LOCK(sc); sc->sc_flags &= ~SCF_DETACHING; BRIDGE_UNLOCK(sc); } return 0; } 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); \ BRIDGE_UNLOCK(sc); \ if (error) \ break; \ \ if (bc->bc_flags & BC_F_COPYOUT) \ error = copyout(&args, ifd->ifd_data, ifd->ifd_len); \ } while (0) /* * bridge_ioctl: * * Handle a control request from the operator. */ static errno_t bridge_ioctl(struct ifnet *ifp, u_long cmd, void *data) { struct bridge_softc *sc = ifp->if_softc; struct ifreq *ifr = (struct ifreq *) data; int error = 0; lck_mtx_assert(sc->sc_mtx, LCK_MTX_ASSERT_NOTOWNED); #if BRIDGE_DEBUG if (_if_brige_debug) printf("bridge_ioctl: ifp %p cmd 0x%08lx (%c%c [%lu] %c %lu)\n", ifp, cmd, (cmd & IOC_IN) ? 'I' : ' ', (cmd & IOC_OUT) ? 'O' : ' ', IOCPARM_LEN(cmd), (char)IOCGROUP(cmd), cmd & 0xff); #endif switch (cmd) { case SIOCSIFADDR: case SIOCAIFADDR: ifnet_set_flags(ifp, IFF_UP, IFF_UP); break; case SIOCGIFMEDIA32: case SIOCGIFMEDIA64: error = EINVAL; 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_stop(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) printf("bridge_ioctl: ifnet_set_lladdr failed %d\n", error); break; case SIOCSIFMTU: /* Do not allow the MTU to be changed on the bridge */ error = EINVAL; break; default: /* * drop the lock as ether_ioctl() will call bridge_start() and * cause the lock to be recursed. */ error = ether_ioctl(ifp, cmd, data); #if BRIDGE_DEBUG if (error != 0) printf("bridge_ioctl: ether_ioctl ifp %p cmd 0x%08lx (%c%c [%lu] %c %lu) failed error: %d\n", ifp, cmd, (cmd & IOC_IN) ? 'I' : ' ', (cmd & IOC_OUT) ? 'O' : ' ', IOCPARM_LEN(cmd), (char) IOCGROUP(cmd), cmd & 0xff, error); #endif /* BRIDGE_DEBUG */ break; } lck_mtx_assert(sc->sc_mtx, LCK_MTX_ASSERT_NOTOWNED); 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) printf("error setting interface capabilities on %s\n", ifnet_name(sc->sc_ifp), ifnet_unit(sc->sc_ifp), ifp->if_xname); } } #endif /* HAS_IF_CAP */ /* * bridge_lookup_member: * * Lookup a bridge member interface. */ static struct bridge_iflist * bridge_lookup_member(struct bridge_softc *sc, const char *name) { struct bridge_iflist *bif; struct ifnet *ifp; char if_xname[IFNAMSIZ]; BRIDGE_LOCK_ASSERT(sc); TAILQ_FOREACH(bif, &sc->sc_iflist, bif_next) { ifp = bif->bif_ifp; snprintf(if_xname, sizeof(if_xname), "%s%d", ifnet_name(ifp), ifnet_unit(ifp)); if (strncmp(if_xname, name, sizeof(if_xname)) == 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(sc); TAILQ_FOREACH(bif, &sc->sc_iflist, bif_next) { if (bif->bif_ifp == member_ifp) return (bif); } return (NULL); } static errno_t bridge_iff_input(void* cookie, ifnet_t ifp, __unused protocol_family_t protocol, mbuf_t *data, char **frame_ptr) { errno_t error = 0; struct bridge_iflist *bif = (struct bridge_iflist *)cookie; struct bridge_softc *sc = bif->bif_sc; int included = 0; size_t frmlen = 0; mbuf_t m = *data; if ((m->m_flags & M_PROTO1)) goto out; if (*frame_ptr >= (char *)mbuf_datastart(m) && *frame_ptr <= (char *)mbuf_data(m)) { included = 1; frmlen = (char *)mbuf_data(m) - *frame_ptr; } #if BRIDGE_DEBUG if (_if_brige_debug) { printf("bridge_iff_input %s%d from %s%d m %p data %p frame %p %s frmlen %lu\n", ifnet_name(sc->sc_ifp), ifnet_unit(sc->sc_ifp), ifnet_name(ifp), ifnet_unit(ifp), m, mbuf_data(m), *frame_ptr, included ? "inside" : "outside", frmlen); if (_if_brige_debug > 1) { printf_mbuf(m, "bridge_iff_input[", "\n"); printf_ether_header((struct ether_header *)*frame_ptr); printf_mbuf_data(m, 0, 20); printf("\n"); } } #endif /* BRIDGE_DEBUG */ /* Move data pointer to start of frame to the link layer header */ if (included) { (void) mbuf_setdata(m, (char *)mbuf_data(m) - frmlen, mbuf_len(m) + frmlen); (void) mbuf_pkthdr_adjustlen(m, frmlen); } else { printf("bridge_iff_input: frame_ptr outside mbuf\n"); goto out; } error = bridge_input(ifp, m, *frame_ptr); /* Adjust packet back to original */ if (error == 0) { (void) mbuf_setdata(m, (char *)mbuf_data(m) + frmlen, mbuf_len(m) - frmlen); (void) mbuf_pkthdr_adjustlen(m, -frmlen); } #if BRIDGE_DEBUG if (_if_brige_debug > 1) { printf("\n"); printf_mbuf(m, "bridge_iff_input]", "\n"); } #endif /* BRIDGE_DEBUG */ out: lck_mtx_assert(sc->sc_mtx, LCK_MTX_ASSERT_NOTOWNED); return error; } #if BRIDGE_MEMBER_OUT_FILTER static errno_t bridge_iff_output(void *cookie, ifnet_t ifp, __unused protocol_family_t protocol, mbuf_t *data) { 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; #if BRIDGE_DEBUG if (_if_brige_debug) { printf("bridge_iff_output %s%d from %s%d m %p data %p\n", ifnet_name(sc->sc_ifp), ifnet_unit(sc->sc_ifp), ifnet_name(ifp), ifnet_unit(ifp), m, mbuf_data(m)); } #endif /* BRIDGE_DEBUG */ error = bridge_output(sc, ifp, m); if (error != 0) { printf("bridge_iff_output: bridge_output failed error %d\n", error); } out: lck_mtx_assert(sc->sc_mtx, LCK_MTX_ASSERT_NOTOWNED); return error; } #endif /* BRIDGE_MEMBER_OUT_FILTER */ static void bridge_iff_event(void* cookie, ifnet_t ifp, __unused protocol_family_t protocol, const struct kev_msg *event_msg) { struct bridge_iflist *bif = (struct bridge_iflist *)cookie; if (event_msg->vendor_code == KEV_VENDOR_APPLE && event_msg->kev_class == KEV_NETWORK_CLASS && event_msg->kev_subclass == KEV_DL_SUBCLASS) { switch (event_msg->event_code) { case KEV_DL_IF_DETACHING: case KEV_DL_IF_DETACHED: bridge_ifdetach(bif, ifp); break; case KEV_DL_LINK_OFF: case KEV_DL_LINK_ON: { bstp_linkstate(ifp, event_msg->event_code); break; } case KEV_DL_SIFFLAGS: { if (bif->bif_promisc == 0 && (ifp->if_flags & IFF_UP)) { errno_t error = ifnet_set_promiscuous(ifp, 1); if (error != 0) { printf("bridge_iff_event: ifnet_set_promiscuous(%s%d) failed %d\n", ifnet_name(ifp), ifnet_unit(ifp), error); } else { bif->bif_promisc = 1; } } break; } default: break; } } } /* * bridge_iff_detached: * * Detach an interface from a bridge. Called when a member * interface is detaching. */ static void bridge_iff_detached(void* cookie, __unused ifnet_t ifp) { struct bridge_iflist *bif = (struct bridge_iflist *)cookie; #if BRIDGE_DEBUG printf("bridge_iff_detached: %s%d\n", ifnet_name(ifp), ifnet_unit(ifp)); #endif bridge_ifdetach(bif, ifp); _FREE(bif, M_DEVBUF); return; } static errno_t bridge_proto_input(ifnet_t ifp, __unused protocol_family_t protocol, __unused mbuf_t packet, __unused char *header) { printf("bridge_proto_input: unexpected packet from %s%d\n", ifnet_name(ifp), ifnet_unit(ifp)); return 0; } static int bridge_attach_protocol(struct ifnet *ifp) { int error; struct ifnet_attach_proto_param reg; printf("bridge_attach_protocol: %s%d\n", ifnet_name(ifp), ifnet_unit(ifp)); bzero(®, sizeof(reg)); reg.input = bridge_proto_input; error = ifnet_attach_protocol(ifp, PF_BRIDGE, ®); if (error) printf("bridge_attach_protocol: ifnet_attach_protocol(%s%d) failed, %d\n", ifnet_name(ifp), ifnet_unit(ifp), error); return (error); } static int bridge_detach_protocol(struct ifnet *ifp) { int error; printf("bridge_detach_protocol: %s%d\n", ifnet_name(ifp), ifnet_unit(ifp)); error = ifnet_detach_protocol(ifp, PF_BRIDGE); if (error) printf("bridge_attach_protocol: ifnet_detach_protocol(%s%d) failed, %d\n", ifnet_name(ifp), ifnet_unit(ifp), error); return (error); } /* * bridge_delete_member: * * Delete the specified member interface. */ static void bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, int gone) { struct ifnet *ifs = bif->bif_ifp; BRIDGE_LOCK_ASSERT(sc); if (!gone) { switch (ifs->if_type) { case IFT_ETHER: case IFT_L2VLAN: /* * Take the interface out of promiscuous mode. */ if (bif->bif_promisc) (void) ifnet_set_promiscuous(ifs, 0); break; case IFT_GIF: break; default: #ifdef DIAGNOSTIC panic("bridge_delete_member: impossible"); #endif break; } #if HAS_IF_CAP /* reneable any interface capabilities */ bridge_set_ifcap(sc, bif, bif->bif_savedcaps); #endif } if (bif->bif_proto_attached) { /* Respect lock ordering with DLIL lock */ BRIDGE_UNLOCK(sc); (void) bridge_detach_protocol(ifs); BRIDGE_LOCK(sc); } if (bif->bif_flags & IFBIF_STP) bstp_disable(&bif->bif_stp); ifs->if_bridge = NULL; BRIDGE_XLOCK(sc); TAILQ_REMOVE(&sc->sc_iflist, bif, bif_next); BRIDGE_XDROP(sc); ifnet_release(ifs); #if HAS_IF_CAP bridge_mutecaps(sc); /* recalcuate now this interface is removed */ #endif /* HAS_IF_CAP */ bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); KASSERT(bif->bif_addrcnt == 0, ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); BRIDGE_UNLOCK(sc); bstp_destroy(&bif->bif_stp); /* prepare to free */ BRIDGE_LOCK(sc); if (bif->bif_filter_attached) { /* Respect lock ordering with DLIL lock */ BRIDGE_UNLOCK(sc); iflt_detach(bif->bif_iff_ref); BRIDGE_LOCK(sc); } else { _FREE(bif, M_DEVBUF); } } /* * bridge_delete_span: * * Delete the specified span interface. */ static void bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) { BRIDGE_LOCK_ASSERT(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); _FREE(bif, M_DEVBUF); } static int bridge_ioctl_add(struct bridge_softc *sc, void *arg) { struct ifbreq *req = arg; struct bridge_iflist *bif = NULL; struct ifnet *ifs; int error = 0; struct iff_filter iff; ifs = ifunit(req->ifbr_ifsname); if (ifs == NULL) return (ENOENT); if (ifs->if_ioctl == NULL) /* must be supported */ 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); /* Allow the first Ethernet member to define the MTU */ if (ifs->if_type != IFT_GIF) { if (TAILQ_EMPTY(&sc->sc_iflist)) sc->sc_ifp->if_mtu = ifs->if_mtu; else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { printf("%s%d: invalid MTU for %s%d", ifnet_name(sc->sc_ifp), ifnet_unit(sc->sc_ifp), ifnet_name(ifs), ifnet_unit(ifs)); return (EINVAL); } } if (ifs->if_bridge == sc) return (EEXIST); if (ifs->if_bridge != NULL) return (EBUSY); bif = _MALLOC(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); if (bif == NULL) return (ENOMEM); bif->bif_ifp = ifs; bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; #if HAS_IF_CAP bif->bif_savedcaps = ifs->if_capenable; #endif /* HAS_IF_CAP */ bif->bif_sc = sc; ifnet_reference(ifs); ifs->if_bridge = sc; bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); /* * XXX: XLOCK HERE!?! */ TAILQ_INSERT_TAIL(&sc->sc_iflist, bif, bif_next); #if HAS_IF_CAP /* Set interface capabilities to the intersection set of all members */ bridge_mutecaps(sc); #endif /* HAS_IF_CAP */ switch (ifs->if_type) { case IFT_ETHER: case IFT_L2VLAN: /* * Place the interface into promiscuous mode. */ error = ifnet_set_promiscuous(ifs, 1); if (error) { /* Ignore error when device is not up */ if (error != ENETDOWN) goto out; error = 0; } else { bif->bif_promisc = 1; } break; case IFT_GIF: break; default: error = EINVAL; goto out; } /* * Respect lock ordering with DLIL lock for the following operations */ BRIDGE_UNLOCK(sc); /* * 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; #if BRIDGE_MEMBER_OUT_FILTER iff.iff_output = bridge_iff_output; #endif /* BRIDGE_MEMBER_OUT_FILTER */ iff.iff_event = bridge_iff_event; iff.iff_detached = bridge_iff_detached; error = iflt_attach(ifs, &iff, &bif->bif_iff_ref); if (error != 0) { printf("bridge_ioctl_add: iflt_attach failed %d\n", error); BRIDGE_LOCK(sc); goto out; } bif->bif_filter_attached = 1; /* * install an dummy "bridge" protocol */ if ((error = bridge_attach_protocol(ifs)) != 0) { if (error != 0) { printf("bridge_ioctl_add: bridge_attach_protocol failed %d\n", error); BRIDGE_LOCK(sc); goto out; } } bif->bif_proto_attached = 1; BRIDGE_LOCK(sc); out: if (error && bif != NULL) bridge_delete_member(sc, bif, 1); return (error); } static int bridge_ioctl_del(struct bridge_softc *sc, void *arg) { struct ifbreq *req = arg; struct bridge_iflist *bif; bif = bridge_lookup_member(sc, req->ifbr_ifsname); if (bif == NULL) return (ENOENT); bridge_delete_member(sc, bif, 0); return (0); } static int bridge_ioctl_purge(__unused struct bridge_softc *sc, __unused void *arg) { return (0); } static int bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) { struct ifbreq *req = arg; struct bridge_iflist *bif; struct bstp_port *bp; bif = bridge_lookup_member(sc, req->ifbr_ifsname); if (bif == NULL) return (ENOENT); bp = &bif->bif_stp; req->ifbr_ifsflags = bif->bif_flags; req->ifbr_state = bp->bp_state; req->ifbr_priority = bp->bp_priority; req->ifbr_path_cost = bp->bp_path_cost; req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; req->ifbr_proto = bp->bp_protover; req->ifbr_role = bp->bp_role; req->ifbr_stpflags = bp->bp_flags; req->ifbr_addrcnt = bif->bif_addrcnt; req->ifbr_addrmax = bif->bif_addrmax; req->ifbr_addrexceeded = bif->bif_addrexceeded; /* 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; return (0); } static int bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) { struct ifbreq *req = arg; struct bridge_iflist *bif; struct bstp_port *bp; int error; bif = bridge_lookup_member(sc, req->ifbr_ifsname); if (bif == NULL) return (ENOENT); bp = &bif->bif_stp; if (req->ifbr_ifsflags & IFBIF_SPAN) /* SPAN is readonly */ return (EINVAL); if (req->ifbr_ifsflags & IFBIF_STP) { if ((bif->bif_flags & IFBIF_STP) == 0) { error = bstp_enable(&bif->bif_stp); if (error) return (error); } } else { if ((bif->bif_flags & IFBIF_STP) != 0) bstp_disable(&bif->bif_stp); } /* Pass on STP flags */ bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); /* Save the bits relating to the bridge */ bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; return (0); } static int bridge_ioctl_scache(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; sc->sc_brtmax = param->ifbrp_csize; bridge_rttrim(sc); return (0); } static int bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) { struct ifbrparam *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 = _MALLOC(buflen, M_TEMP, M_WAITOK | M_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%d", \ ifnet_name(bif->bif_ifp), ifnet_unit(bif->bif_ifp)); \ /* Fill in the ifbreq structure */ \ error = bridge_ioctl_gifflags(sc, &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%d", \ ifnet_name(bif->bif_ifp), ifnet_unit(bif->bif_ifp)); \ breq.ifbr_ifsflags = bif->bif_flags; \ 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; \ error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); \ BRIDGE_LOCK(sc); \ _FREE(outbuf, M_TEMP); \ } while (0) static int bridge_ioctl_gifs64(struct bridge_softc *sc, void *arg) { struct ifbifconf64 *bifc = arg; int error = 0; BRIDGE_IOCTL_GIFS; return (error); } static int bridge_ioctl_gifs32(struct bridge_softc *sc, void *arg) { struct ifbifconf32 *bifc = arg; int error = 0; BRIDGE_IOCTL_GIFS; return (error); } #define BRIDGE_IOCTL_RTS do { \ struct bridge_rtnode *brt; \ char *buf, *outbuf; \ unsigned int count, buflen, len; \ struct timespec now; \ \ if (bac->ifbac_len == 0) \ return (0); \ \ count = 0; \ LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) \ count++; \ buflen = sizeof(bareq) * count; \ \ BRIDGE_UNLOCK(sc); \ outbuf = _MALLOC(buflen, M_TEMP, M_WAITOK | M_ZERO); \ BRIDGE_LOCK(sc); \ \ count = 0; \ buf = outbuf; \ len = min(bac->ifbac_len, buflen); \ bzero(&bareq, sizeof(bareq)); \ LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { \ if (len < sizeof(bareq)) \ goto out; \ snprintf(bareq.ifba_ifsname, sizeof(bareq.ifba_ifsname), "%s%d", \ ifnet_name(brt->brt_ifp), ifnet_unit(brt->brt_ifp)); \ 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) { \ nanouptime(&now); \ if ((unsigned long)now.tv_sec < brt->brt_expire) \ bareq.ifba_expire = brt->brt_expire - now.tv_sec; \ } else \ bareq.ifba_expire = 0; \ bareq.ifba_flags = brt->brt_flags; \ \ memcpy(buf, &bareq, sizeof(bareq)); \ count++; \ buf += sizeof(bareq); \ len -= sizeof(bareq); \ } \ out: \ BRIDGE_UNLOCK(sc); \ bac->ifbac_len = sizeof(bareq) * count; \ error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); \ BRIDGE_LOCK(sc); \ _FREE(outbuf, M_TEMP); \ return (error); \ } while (0) static int bridge_ioctl_rts64(struct bridge_softc *sc, void *arg) { struct ifbaconf64 *bac = arg; struct ifbareq64 bareq; int error = 0; BRIDGE_IOCTL_RTS; return (error); } static int bridge_ioctl_rts32(struct bridge_softc *sc, void *arg) { struct ifbaconf32 *bac = arg; struct ifbareq32 bareq; int error = 0; BRIDGE_IOCTL_RTS; return (error); } static int bridge_ioctl_saddr32(struct bridge_softc *sc, void *arg) { struct ifbareq32 *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 *arg) { struct ifbareq64 *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 *arg) { struct ifbrparam *param = arg; sc->sc_brttimeout = param->ifbrp_ctime; return (0); } static int bridge_ioctl_gto(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; param->ifbrp_ctime = sc->sc_brttimeout; return (0); } static int bridge_ioctl_daddr32(struct bridge_softc *sc, void *arg) { struct ifbareq32 *req = arg; return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); } static int bridge_ioctl_daddr64(struct bridge_softc *sc, void *arg) { struct ifbareq64 *req = arg; return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); } static int bridge_ioctl_flush(struct bridge_softc *sc, void *arg) { struct ifbreq *req = arg; bridge_rtflush(sc, req->ifbr_ifsflags); return (0); } static int bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) { struct ifbrparam *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 *arg) { struct ifbrparam *param = arg; return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); } static int bridge_ioctl_ght(struct bridge_softc *sc, void *arg) { struct ifbrparam *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 *arg) { struct ifbrparam *param = arg; return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); } static int bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; struct bstp_state *bs = &sc->sc_stp; param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; return (0); } static int bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); } static int bridge_ioctl_gma(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; struct bstp_state *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 *arg) { struct ifbrparam *param = arg; return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); } static int bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) { 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)); } static int bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) { 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)); } static int bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; param->ifbrp_filter = sc->sc_filter_flags; return (0); } static int bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; if (param->ifbrp_filter & ~IFBF_FILT_MASK) return (EINVAL); #ifndef BRIDGE_IPF if (param->ifbrp_filter & IFBF_FILT_USEIPF) return (EINVAL); #endif sc->sc_filter_flags = param->ifbrp_filter; return (0); } static int bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) { struct ifbreq *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 *arg) { struct ifbreq *req = arg; struct bridge_iflist *bif = NULL; struct ifnet *ifs; ifs = ifunit(req->ifbr_ifsname); if (ifs == NULL) return (ENOENT); 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_GIF: case IFT_L2VLAN: break; default: return (EINVAL); } bif = _MALLOC(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); if (bif == NULL) return (ENOMEM); bif->bif_ifp = ifs; bif->bif_flags = 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 *arg) { struct ifbreq *req = arg; struct bridge_iflist *bif; struct ifnet *ifs; ifs = ifunit(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 *arg) { struct ifbropreq32 *req = arg; BRIDGE_IOCTL_GBPARAM; return (0); } static int bridge_ioctl_gbparam64(struct bridge_softc *sc, void *arg) { struct ifbropreq64 *req = arg; BRIDGE_IOCTL_GBPARAM; return (0); } static int bridge_ioctl_grte(struct bridge_softc *sc, void *arg) { struct ifbrparam *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_flags & IFBIF_STP) != 0) \ count++; \ } \ \ buflen = sizeof(bpreq) * count; \ if (bifstp->ifbpstp_len == 0) { \ bifstp->ifbpstp_len = buflen; \ return (0); \ } \ \ BRIDGE_UNLOCK(sc); \ outbuf = _MALLOC(buflen, M_TEMP, M_WAITOK | M_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_flags & 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; \ error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); \ BRIDGE_LOCK(sc); \ _FREE(outbuf, M_TEMP); \ return (error); \ } while (0) static int bridge_ioctl_gifsstp32(struct bridge_softc *sc, void *arg) { struct ifbpstpconf32 *bifstp = arg; int error = 0; BRIDGE_IOCTL_GIFSSTP; return (error); } static int bridge_ioctl_gifsstp64(struct bridge_softc *sc, void *arg) { struct ifbpstpconf64 *bifstp = arg; int error = 0; BRIDGE_IOCTL_GIFSSTP; return (error); } static int bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); } static int bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); } /* * bridge_ifdetach: * * Detach an interface from a bridge. Called when a member * interface is detaching. */ __private_extern__ void bridge_ifdetach(struct bridge_iflist *bif, struct ifnet *ifp) { struct bridge_softc *sc = ifp->if_bridge; #if BRIDGE_DEBUG printf("bridge_ifdetach %s%d\n", ifnet_name(ifp), ifnet_unit(ifp)); #endif /* 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, 1); 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); } /* * bridge_init: * * Initialize a bridge interface. */ static int bridge_init(struct ifnet *ifp) { struct bridge_softc *sc = (struct bridge_softc *)ifp->if_softc; struct timespec ts; errno_t error; BRIDGE_LOCK_ASSERT(sc); if ((ifnet_flags(ifp) & IFF_RUNNING)) return 0; ts.tv_sec = bridge_rtable_prune_period; ts.tv_nsec = 0; bsd_timeout(bridge_timer, sc, &ts); error = ifnet_set_flags(ifp, IFF_RUNNING, IFF_RUNNING); if (error == 0) bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ return error; } /* * bridge_stop: * * Stop the bridge interface. */ static void bridge_stop(struct ifnet *ifp, __unused int disable) { struct bridge_softc *sc = ifp->if_softc; BRIDGE_LOCK_ASSERT(sc); if ((ifnet_flags(ifp) & IFF_RUNNING) == 0) return; bsd_untimeout(bridge_timer, sc); bstp_stop(&sc->sc_stp); bridge_rtflush(sc, IFBF_FLUSHDYN); (void) ifnet_set_flags(ifp, 0, IFF_RUNNING); } /* * bridge_enqueue: * * Enqueue a packet on a bridge member interface. * */ static void bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) { int len, error = 0; short mflags; struct mbuf *m0; /* We may be sending a fragment so traverse the mbuf */ for (; m; m = m0) { m0 = m->m_nextpkt; m->m_nextpkt = NULL; len = m->m_pkthdr.len; mflags = m->m_flags; m->m_flags |= M_PROTO1; //set to avoid loops #if HAS_IF_CAP /* * If underlying interface can not do VLAN tag insertion itself * then attach a packet tag that holds it. */ if ((m->m_flags & M_VLANTAG) && (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); if (m == NULL) { printf("%s%d: unable to prepend VLAN header\n", ifnet_name(dst_ifp), ifnet_unit(dst_ifp)); (void) ifnet_stat_increment_out(dst_ifp, 0, 0, 1); continue; } m->m_flags &= ~M_VLANTAG; } #endif /* HAS_IF_CAP */ error = ifnet_output_raw(dst_ifp, 0, m); if (error == 0) { (void) ifnet_stat_increment_out(sc->sc_ifp, 1, len, 0); } else { (void) ifnet_stat_increment_out(sc->sc_ifp, 0, 0, 1); } } return; } #if HAS_BRIDGE_DUMMYNET /* * bridge_dummynet: * * Receive a queued packet from dummynet and pass it on to the output * interface. * * The mbuf has the Ethernet header already attached. */ static void bridge_dummynet(struct mbuf *m, struct ifnet *ifp) { struct bridge_softc *sc; sc = ifp->if_bridge; /* * The packet didnt originate from a member interface. This should only * ever happen if a member interface is removed while packets are * queued for it. */ if (sc == NULL) { m_freem(m); return; } if (PFIL_HOOKED(&inet_pfil_hook) #ifdef INET6 || PFIL_HOOKED(&inet6_pfil_hook) #endif ) { if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) return; if (m == NULL) return; } bridge_enqueue(sc, ifp, m); } #endif /* HAS_BRIDGE_DUMMYNET */ #if BRIDGE_MEMBER_OUT_FILTER /* * bridge_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. We must * enqueue or free the mbuf before returning. */ static int bridge_output(struct ifnet *ifp, struct mbuf *m, __unused struct sockaddr *sa, __unused struct rtentry *rt) { struct ether_header *eh; struct ifnet *dst_if; struct bridge_softc *sc; uint16_t vlan; #if BRIDGE_DEBUG if (_if_brige_debug) printf("bridge_output ifp %p %s%d\n", ifp, ifnet_name(ifp), ifnet_unit(ifp)); #endif /* BRIDGE_DEBUG */ if (m->m_len < ETHER_HDR_LEN) { m = m_pullup(m, ETHER_HDR_LEN); if (m == NULL) return (0); } eh = mtod(m, struct ether_header *); sc = ifp->if_bridge; vlan = VLANTAGOF(m); BRIDGE_LOCK(sc); /* 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 ((sc->sc_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 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); if (dst_if == NULL) { struct bridge_iflist *bif; struct mbuf *mc; int error = 0, used = 0; bridge_span(sc, m); BRIDGE_LOCK2REF(sc, error); if (error) { m_freem(m); return (0); } TAILQ_FOREACH(bif, &sc->sc_iflist, bif_next) { dst_if = bif->bif_ifp; if (dst_if->if_type == IFT_GIF) continue; if ((dst_if->if_flags & IFF_RUNNING) == 0) continue; /* * If this is not the original output interface, * and the interface is participating in spanning * tree, make sure the port is in a state that * allows forwarding. */ if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) continue; if (LIST_NEXT(bif, bif_next) == NULL) { used = 1; mc = m; } else { mc = m_copypacket(m, M_DONTWAIT); if (mc == NULL) { (void) ifnet_stat_increment_out(sc->sc_ifp, 0, 0, 1); continue; } } bridge_enqueue(sc, dst_if, mc); } if (used == 0) m_freem(m); BRIDGE_UNREF(sc); return (0); } sendunicast: /* * XXX Spanning tree consideration here? */ bridge_span(sc, m); if ((dst_if->if_flags & IFF_RUNNING) == 0) { m_freem(m); BRIDGE_UNLOCK(sc); return (0); } BRIDGE_UNLOCK(sc); bridge_enqueue(sc, dst_if, m); return (0); } #endif /* BRIDGE_MEMBER_OUT_FILTER */ #if APPLE_BRIDGE_HWCKSUM_SUPPORT static struct mbuf* bridge_fix_txcsum( struct mbuf *m ) { // basic tests indicate that the vast majority of packets being processed // here have an Ethernet header mbuf pre-pended to them (the first case below) // the second highest are those where the Ethernet and IP/TCP/UDP headers are // all in one mbuf (second case below) // the third case has, in fact, never hit for me -- although if I comment out // the first two cases, that code works for them, so I consider it a // decent general solution int amt = ETHER_HDR_LEN; int hlen = M_CSUM_DATA_IPv4_IPHL( m->m_pkthdr.csum_data ); int off = M_CSUM_DATA_IPv4_OFFSET( m->m_pkthdr.csum_data ); /* * NOTE we should never get vlan-attached packets here; * support for those COULD be added, but we don't use them * and it really kinda slows things down to worry about them */ #ifdef DIAGNOSTIC if ( m_tag_find( m, PACKET_TAG_VLAN, NULL ) != NULL ) { printf( "bridge: transmitting packet tagged with VLAN?\n" ); KASSERT( 0 ); m_freem( m ); return NULL; } #endif if ( m->m_pkthdr.csum_flags & M_CSUM_IPv4 ) { amt += hlen; } if ( m->m_pkthdr.csum_flags & M_CSUM_TCPv4 ) { amt += off + sizeof( uint16_t ); } if ( m->m_pkthdr.csum_flags & M_CSUM_UDPv4 ) { amt += off + sizeof( uint16_t ); } if ( m->m_len == ETHER_HDR_LEN ) { // this is the case where there's an Ethernet header in an mbuf // the first mbuf is the Ethernet header -- just strip it off and do the checksum struct mbuf *m_ip = m->m_next; // set up m_ip so the cksum operations work /* APPLE MODIFICATION 22 Apr 2008 <mvega@apple.com> * <rdar://5817385> Clear the m_tag list before setting * M_PKTHDR. * * If this m_buf chain was extended via M_PREPEND(), then * m_ip->m_pkthdr is identical to m->m_pkthdr (see * M_MOVE_PKTHDR()). The only thing preventing access to this * invalid packet header data is the fact that the M_PKTHDR * flag is clear, i.e., m_ip->m_flag & M_PKTHDR == 0, but we're * about to set the M_PKTHDR flag, so to be safe we initialize, * more accurately, we clear, m_ip->m_pkthdr.tags via * m_tag_init(). * * Suppose that we do not do this; if m_pullup(), below, fails, * then m_ip will be freed along with m_ip->m_pkthdr.tags, but * we will also free m soon after, via m_freem(), and * consequently attempt to free m->m_pkthdr.tags in the * process. The problem is that m->m_pkthdr.tags will have * already been freed by virtue of being equal to * m_ip->m_pkthdr.tags. Attempts to dereference * m->m_pkthdr.tags in m_tag_delete_chain() will result in a * panic. */ m_tag_init(m_ip); /* END MODIFICATION */ m_ip->m_flags |= M_PKTHDR; m_ip->m_pkthdr.csum_flags = m->m_pkthdr.csum_flags; m_ip->m_pkthdr.csum_data = m->m_pkthdr.csum_data; m_ip->m_pkthdr.len = m->m_pkthdr.len - ETHER_HDR_LEN; // set up the header mbuf so we can prepend it back on again later m->m_pkthdr.csum_flags = 0; m->m_pkthdr.csum_data = 0; m->m_pkthdr.len = ETHER_HDR_LEN; m->m_next = NULL; // now do the checksums we need -- first IP if ( m_ip->m_pkthdr.csum_flags & M_CSUM_IPv4 ) { // make sure the IP header (or at least the part with the cksum) is there m_ip = m_pullup( m_ip, sizeof( struct ip ) ); if ( m_ip == NULL ) { printf( "bridge: failed to flatten header\n "); m_freem( m ); return NULL; } // now do the checksum { struct ip *ip = mtod( m_ip, struct ip* ); ip->ip_sum = in_cksum( m_ip, hlen ); #ifdef VERY_VERY_VERY_DIAGNOSTIC printf( "bridge: performed IPv4 checksum\n" ); #endif } } // now do a TCP or UDP delayed checksum if ( m_ip->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4) ) { in_delayed_cksum( m_ip ); #ifdef VERY_VERY_VERY_DIAGNOSTIC printf( "bridge: performed TCPv4/UDPv4 checksum\n" ); #endif } // now attach the ethernet header back onto the IP packet m->m_next = m_ip; m->m_pkthdr.len += m_length( m_ip ); // clear the M_PKTHDR flags on the ip packet (again, we re-attach later) m_ip->m_flags &= ~M_PKTHDR; // and clear any csum flags m->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv4|M_CSUM_UDPv4|M_CSUM_IPv4); } else if ( m->m_len >= amt ) { // everything fits in the first mbuf, so futz with m->m_data, m->m_len and m->m_pkthdr.len to // make it work m->m_len -= ETHER_HDR_LEN; m->m_data += ETHER_HDR_LEN; m->m_pkthdr.len -= ETHER_HDR_LEN; // now do the checksums we need -- first IP if ( m->m_pkthdr.csum_flags & M_CSUM_IPv4 ) { struct ip *ip = mtod( m, struct ip* ); ip->ip_sum = in_cksum( m, hlen ); #ifdef VERY_VERY_VERY_DIAGNOSTIC printf( "bridge: performed IPv4 checksum\n" ); #endif } // now do a TCP or UDP delayed checksum if ( m->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4) ) { in_delayed_cksum( m ); #ifdef VERY_VERY_VERY_DIAGNOSTIC printf( "bridge: performed TCPv4/UDPv4 checksum\n" ); #endif } // now stick the ethernet header back on m->m_len += ETHER_HDR_LEN; m->m_data -= ETHER_HDR_LEN; m->m_pkthdr.len += ETHER_HDR_LEN; // and clear any csum flags m->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv4|M_CSUM_UDPv4|M_CSUM_IPv4); } else { struct mbuf *m_ip; // general case -- need to simply split it off and deal // first, calculate how much needs to be made writable (we may have a read-only mbuf here) hlen = M_CSUM_DATA_IPv4_IPHL( m->m_pkthdr.csum_data ); #if PARANOID off = M_CSUM_DATA_IPv4_OFFSET( m->m_pkthdr.csum_data ); if ( m->m_pkthdr.csum_flags & M_CSUM_IPv4 ) { amt += hlen; } if ( m->m_pkthdr.csum_flags & M_CSUM_TCPv4 ) { amt += sizeof( struct tcphdr * ); amt += off; } if ( m->m_pkthdr.csum_flags & M_CSUM_UDPv4 ) { amt += sizeof( struct udphdr * ); amt += off; } #endif // now split the ethernet header off of the IP packet (we'll re-attach later) m_ip = m_split( m, ETHER_HDR_LEN, M_NOWAIT ); if ( m_ip == NULL ) { printf( "bridge_fix_txcsum: could not split ether header\n" ); m_freem( m ); return NULL; } #if PARANOID // make sure that the IP packet is writable for the portion we need if ( m_makewritable( &m_ip, 0, amt, M_DONTWAIT ) != 0 ) { printf( "bridge_fix_txcsum: could not make %d bytes writable\n", amt ); m_freem( m ); m_freem( m_ip ); return NULL; } #endif m_ip->m_pkthdr.csum_flags = m->m_pkthdr.csum_flags; m_ip->m_pkthdr.csum_data = m->m_pkthdr.csum_data; m->m_pkthdr.csum_flags = 0; m->m_pkthdr.csum_data = 0; // now do the checksums we need -- first IP if ( m_ip->m_pkthdr.csum_flags & M_CSUM_IPv4 ) { // make sure the IP header (or at least the part with the cksum) is there m_ip = m_pullup( m_ip, sizeof( struct ip ) ); if ( m_ip == NULL ) { printf( "bridge: failed to flatten header\n "); m_freem( m ); return NULL; } // now do the checksum { struct ip *ip = mtod( m_ip, struct ip* ); ip->ip_sum = in_cksum( m_ip, hlen ); #ifdef VERY_VERY_VERY_DIAGNOSTIC printf( "bridge: performed IPv4 checksum\n" ); #endif } } // now do a TCP or UDP delayed checksum if ( m_ip->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4) ) { in_delayed_cksum( m_ip ); #ifdef VERY_VERY_VERY_DIAGNOSTIC printf( "bridge: performed TCPv4/UDPv4 checksum\n" ); #endif } // now attach the ethernet header back onto the IP packet m->m_next = m_ip; m->m_pkthdr.len += m_length( m_ip ); // clear the M_PKTHDR flags on the ip packet (again, we re-attach later) m_ip->m_flags &= ~M_PKTHDR; // and clear any csum flags m->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv4|M_CSUM_UDPv4|M_CSUM_IPv4); } return m; } #endif /* * bridge_start: * * Start output on a bridge. * */ static errno_t bridge_start(struct ifnet *ifp, struct mbuf *m) { struct bridge_softc *sc = ifnet_softc(ifp); struct ether_header *eh; struct ifnet *dst_if; lck_mtx_assert(sc->sc_mtx, LCK_MTX_ASSERT_NOTOWNED); eh = mtod(m, struct ether_header *); BRIDGE_LOCK(sc); if ((m->m_flags & (M_BCAST|M_MCAST)) == 0 && (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 0)) != NULL) { { #if APPLE_BRIDGE_HWCKSUM_SUPPORT /* * APPLE MODIFICATION - if the packet needs a checksum (i.e., * checksum has been deferred for HW support) AND the destination * interface doesn't support HW checksums, then we * need to fix-up the checksum here */ if ( ( (m->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4|M_CSUM_IPv4) ) != 0 ) && ( (dst_if->if_csum_flags_tx & m->m_pkthdr.csum_flags ) != m->m_pkthdr.csum_flags ) ) { m = bridge_fix_txcsum( m ); if ( m == NULL ) { goto done; } } #else if (eh->ether_type == htons(ETHERTYPE_IP)) mbuf_outbound_finalize(m, PF_INET, sizeof(struct ether_header)); else m->m_pkthdr.csum_flags = 0; #endif #if NBPFILTER > 0 if (sc->sc_bpf_output) bridge_bpf_output(ifp, m); #endif BRIDGE_UNLOCK(sc); bridge_enqueue(sc, dst_if, m); } } else { #if APPLE_BRIDGE_HWCKSUM_SUPPORT /* * APPLE MODIFICATION - if the MULTICAST packet needs a checksum (i.e., * checksum has been deferred for HW support) AND at least one destination * interface doesn't support HW checksums, then we go ahead and fix it up * here, since it doesn't make sense to do it more than once */ if ( (m->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4|M_CSUM_IPv4)) && /* * XXX FIX ME: keep track of whether or not we have any interfaces that * do not support checksums (for now, assume we do) */ ( 1 ) ) { m = bridge_fix_txcsum( m ); if ( m == NULL ) { goto done; } } #else if (eh->ether_type == htons(ETHERTYPE_IP)) mbuf_outbound_finalize(m, PF_INET, sizeof(struct ether_header)); else m->m_pkthdr.csum_flags = 0; #endif #if NBPFILTER > 0 if (sc->sc_bpf_output) bridge_bpf_output(ifp, m); #endif bridge_broadcast(sc, ifp, m, 0); } #if APPLE_BRIDGE_HWCKSUM_SUPPORT done: #endif return 0; } /* * bridge_forward: * * The forwarding function of the bridge. * * NOTE: Releases the lock on return. */ static void bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, struct mbuf *m) { struct bridge_iflist *dbif; struct ifnet *src_if, *dst_if, *ifp; struct ether_header *eh; uint16_t vlan; uint8_t *dst; int error; lck_mtx_assert(sc->sc_mtx, LCK_MTX_ASSERT_OWNED); #if BRIDGE_DEBUG if (_if_brige_debug) printf("bridge_forward %s%d m%p\n", ifnet_name(sc->sc_ifp), ifnet_unit(sc->sc_ifp), m); #endif /* BRIDGE_DEBUG */ src_if = m->m_pkthdr.rcvif; ifp = sc->sc_ifp; (void) ifnet_stat_increment_in(ifp, 1, m->m_pkthdr.len, 0); vlan = VLANTAGOF(m); if ((sbif->bif_flags & IFBIF_STP) && sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) goto drop; eh = mtod(m, struct ether_header *); dst = eh->ether_dhost; /* If the interface is learning, record the address. */ if (sbif->bif_flags & IFBIF_LEARNING) { error = bridge_rtupdate(sc, eh->ether_shost, vlan, sbif, 0, IFBAF_DYNAMIC); /* * If the interface has addresses limits then deny any source * that is not in the cache. */ if (error && sbif->bif_addrmax) goto drop; } if ((sbif->bif_flags & IFBIF_STP) != 0 && sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) goto drop; /* * At this point, the port either doesn't participate * in spanning tree or it is in the forwarding state. */ /* * If the packet is unicast, destined for someone on * "this" side of the bridge, drop it. */ if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { dst_if = bridge_rtlookup(sc, dst, vlan); if (src_if == dst_if) goto drop; } else { /* * Check if its a reserved multicast address, any address * listed in 802.1D section 7.12.6 may not be forwarded by the * bridge. * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F */ if (dst[0] == 0x01 && dst[1] == 0x80 && dst[2] == 0xc2 && dst[3] == 0x00 && dst[4] == 0x00 && dst[5] <= 0x0f) goto drop; /* ...forward it to all interfaces. */ atomic_add_64(&ifp->if_imcasts, 1); dst_if = NULL; } /* * If we have a destination interface which is a member of our bridge, * OR this is a unicast packet, push it through the bpf(4) machinery. * For broadcast or multicast packets, don't bother because it will * be reinjected into ether_input. We do this before we pass the packets * through the pfil(9) framework, as it is possible that pfil(9) will * drop the packet, or possibly modify it, making it difficult to debug * firewall issues on the bridge. */ #if NBPFILTER > 0 if (eh->ether_type == htons(ETHERTYPE_RSN_PREAUTH) || dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) { m->m_pkthdr.rcvif = ifp; if (sc->sc_bpf_input) bridge_bpf_input(ifp, m); } #endif /* NBPFILTER */ #if defined(PFIL_HOOKS) /* run the packet filter */ if (PFIL_HOOKED(&inet_pfil_hook) #ifdef INET6 || PFIL_HOOKED(&inet6_pfil_hook) #endif /* INET6 */ ) { BRIDGE_UNLOCK(sc); if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) return; if (m == NULL) return; BRIDGE_LOCK(sc); } #endif /* PFIL_HOOKS */ if (dst_if == NULL) { /* * Clear any in-bound checksum flags for this packet. */ mbuf_inbound_modified(m); bridge_broadcast(sc, src_if, m, 1); return; } /* * At this point, we're dealing with a unicast frame * going to a different interface. */ if ((dst_if->if_flags & IFF_RUNNING) == 0) goto drop; dbif = bridge_lookup_member_if(sc, dst_if); if (dbif == NULL) /* Not a member of the bridge (anymore?) */ goto drop; /* Private segments can not talk to each other */ if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) goto drop; if ((dbif->bif_flags & IFBIF_STP) && dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) goto drop; #if HAS_DHCPRA_MASK /* APPLE MODIFICATION <rdar://6985737> */ if ((dst_if->if_extflags & IFEXTF_DHCPRA_MASK) != 0) { m = ip_xdhcpra_output(dst_if, m); if (!m) { ++sc->sc_sc.sc_ifp.if_xdhcpra; return; } } #endif /* HAS_DHCPRA_MASK */ BRIDGE_UNLOCK(sc); #if defined(PFIL_HOOKS) if (PFIL_HOOKED(&inet_pfil_hook) #ifdef INET6 || PFIL_HOOKED(&inet6_pfil_hook) #endif ) { if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) return; if (m == NULL) return; } #endif /* PFIL_HOOKS */ /* * Clear any in-bound checksum flags for this packet. */ mbuf_inbound_modified(m); bridge_enqueue(sc, dst_if, m); return; drop: BRIDGE_UNLOCK(sc); m_freem(m); } #if BRIDGE_DEBUG char * ether_ntop(char *, size_t , const u_char *); __private_extern__ char * ether_ntop(char *buf, size_t len, const u_char *ap) { snprintf(buf, len, "%02x:%02x:%02x:%02x:%02x:%02x", ap[0], ap[1], ap[2], ap[3], ap[4], ap[5]); return buf; } #endif /* BRIDGE_DEBUG */ /* * bridge_input: * * Filter input from a member interface. Queue the packet for * bridging if it is not for us. */ __private_extern__ errno_t bridge_input(struct ifnet *ifp, struct mbuf *m, __unused void *frame_header) { struct bridge_softc *sc = ifp->if_bridge; struct bridge_iflist *bif, *bif2; struct ifnet *bifp; struct ether_header *eh; struct mbuf *mc, *mc2; uint16_t vlan; int error; #if BRIDGE_DEBUG if (_if_brige_debug) printf("bridge_input: %s%d from %s%d m %p data %p\n", ifnet_name(sc->sc_ifp), ifnet_unit(sc->sc_ifp), ifnet_name(ifp), ifnet_unit(ifp), m, mbuf_data(m)); #endif /* BRIDGE_DEBUG */ if ((sc->sc_ifp->if_flags & IFF_RUNNING) == 0) { #if BRIDGE_DEBUG if (_if_brige_debug) printf( "bridge_input: %s%d not running passing along\n", ifnet_name(sc->sc_ifp), ifnet_unit(sc->sc_ifp)); #endif /* BRIDGE_DEBUG */ return 0; } bifp = sc->sc_ifp; vlan = VLANTAGOF(m); #ifdef IFF_MONITOR /* * Implement support for bridge monitoring. If this flag has been * set on this interface, discard the packet once we push it through * the bpf(4) machinery, but before we do, increment the byte and * packet counters associated with this interface. */ if ((bifp->if_flags & IFF_MONITOR) != 0) { m->m_pkthdr.rcvif = bifp; BRIDGE_BPF_MTAP_INPUT(sc, m); (void) ifnet_stat_increment_in(bifp, 1, m->m_pkthdr.len, 0); m_freem(m); return EJUSTRETURN; } #endif /* IFF_MONITOR */ /* * Need to clear the promiscous flags otherwise it will be * dropped by DLIL after processing filters */ if ((mbuf_flags(m) & MBUF_PROMISC)) mbuf_setflags_mask(m, 0, MBUF_PROMISC); BRIDGE_LOCK(sc); bif = bridge_lookup_member_if(sc, ifp); if (bif == NULL) { BRIDGE_UNLOCK(sc); #if BRIDGE_DEBUG if (_if_brige_debug) printf( "bridge_input: %s%d bridge_lookup_member_if failed\n", ifnet_name(sc->sc_ifp), ifnet_unit(sc->sc_ifp)); #endif /* BRIDGE_DEBUG */ return 0; } eh = mtod(m, struct ether_header *); bridge_span(sc, m); if (m->m_flags & (M_BCAST|M_MCAST)) { #if BRIDGE_DEBUG if (_if_brige_debug) if ((m->m_flags & M_MCAST)) printf("mulicast: %02x:%02x:%02x:%02x:%02x:%02x\n", eh->ether_dhost[0], eh->ether_dhost[1], eh->ether_dhost[2], eh->ether_dhost[3], eh->ether_dhost[4], eh->ether_dhost[5]); #endif /* BRIDGE_DEBUG */ /* Tap off 802.1D packets; they do not get forwarded. */ if (memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { m = bstp_input(&bif->bif_stp, ifp, m); if (m == NULL) { BRIDGE_UNLOCK(sc); return EJUSTRETURN; } } if ((bif->bif_flags & IFBIF_STP) && bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { BRIDGE_UNLOCK(sc); return 0; } /* * Make a deep copy of the packet and enqueue the copy * for bridge processing; return the original packet for * local processing. */ mc = m_dup(m, M_DONTWAIT); if (mc == NULL) { BRIDGE_UNLOCK(sc); return 0; } /* * Perform the bridge forwarding function with the copy. * * Note that bridge_forward calls BRIDGE_UNLOCK */ bridge_forward(sc, bif, mc); /* * Reinject the mbuf as arriving on the bridge so we have a * chance at claiming multicast packets. We can not loop back * here from ether_input as a bridge is never a member of a * bridge. */ KASSERT(bifp->if_bridge == NULL, ("loop created in bridge_input")); mc2 = m_dup(m, M_DONTWAIT); if (mc2 != NULL) { /* Keep the layer3 header aligned */ int i = min(mc2->m_pkthdr.len, max_protohdr); mc2 = m_copyup(mc2, i, ETHER_ALIGN); } if (mc2 != NULL) { // mark packet as arriving on the bridge mc2->m_pkthdr.rcvif = bifp; mc2->m_pkthdr.header = mbuf_data(mc2); #if NBPFILTER > 0 if (sc->sc_bpf_input) bridge_bpf_input(bifp, mc2); #endif /* NBPFILTER */ (void) mbuf_setdata(mc2, (char *)mbuf_data(mc2) + ETHER_HDR_LEN, mbuf_len(mc2) - ETHER_HDR_LEN); (void) mbuf_pkthdr_adjustlen(mc2, - ETHER_HDR_LEN); (void) ifnet_stat_increment_in(bifp, 1, mbuf_pkthdr_len(mc2), 0); #if BRIDGE_DEBUG if (_if_brige_debug) printf( "bridge_input: %s%d mcast for us\n", ifnet_name(sc->sc_ifp), ifnet_unit(sc->sc_ifp)); #endif /* BRIDGE_DEBUG */ dlil_input_packet_list(bifp, mc2); } /* Return the original packet for local processing. */ return 0; } if ((bif->bif_flags & IFBIF_STP) && bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { BRIDGE_UNLOCK(sc); return 0; } #ifdef DEV_CARP # define OR_CARP_CHECK_WE_ARE_DST(iface) \ || ((iface)->if_carp \ && carp_forus((iface)->if_carp, eh->ether_dhost)) # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ || ((iface)->if_carp \ && carp_forus((iface)->if_carp, eh->ether_shost)) #else # define OR_CARP_CHECK_WE_ARE_DST(iface) # define OR_CARP_CHECK_WE_ARE_SRC(iface) #endif #ifdef INET6 # define OR_PFIL_HOOKED_INET6 \ || PFIL_HOOKED(&inet6_pfil_hook) #else # define OR_PFIL_HOOKED_INET6 #endif #if defined(PFIL_HOOKS) #define PFIL_PHYS(sc, ifp, m) do { \ if (pfil_local_phys && \ (PFIL_HOOKED(&inet_pfil_hook) \ OR_PFIL_HOOKED_INET6)) { \ if (bridge_pfil(&m, NULL, ifp, \ PFIL_IN) != 0 || m == NULL) { \ BRIDGE_UNLOCK(sc); \ return (NULL); \ } \ } \ } while (0) #else /* PFIL_HOOKS */ #define PFIL_PHYS(sc, ifp, m) #endif /* PFIL_HOOKS */ #define GRAB_OUR_PACKETS(iface) \ if ((iface)->if_type == IFT_GIF) \ continue; \ /* It is destined for us. */ \ if (memcmp(ifnet_lladdr((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ OR_CARP_CHECK_WE_ARE_DST((iface)) \ ) { \ if ((iface)->if_type == IFT_BRIDGE) { \ BRIDGE_BPF_MTAP_INPUT(sc, m); \ /* Filter on the physical interface. */ \ PFIL_PHYS(sc, iface, m); \ } \ if (bif->bif_flags & IFBIF_LEARNING) { \ error = bridge_rtupdate(sc, eh->ether_shost, \ vlan, bif, 0, IFBAF_DYNAMIC); \ if (error && bif->bif_addrmax) { \ BRIDGE_UNLOCK(sc); \ return EJUSTRETURN; \ } \ } \ m->m_pkthdr.rcvif = iface; \ BRIDGE_UNLOCK(sc); \ return 0; \ } \ \ /* We just received a packet that we sent out. */ \ if (memcmp(ifnet_lladdr((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ OR_CARP_CHECK_WE_ARE_SRC((iface)) \ ) { \ BRIDGE_UNLOCK(sc); \ return EJUSTRETURN; \ } /* * Unicast. */ /* * If the packet is for us, set the packets source as the * bridge, and return the packet back to ether_input for * local processing. */ if (memcmp(eh->ether_dhost, ifnet_lladdr(bifp), ETHER_ADDR_LEN) == 0 OR_CARP_CHECK_WE_ARE_DST(bifp)) { /* Mark the packet as arriving on the bridge interface */ (void) mbuf_pkthdr_setrcvif(m, bifp); mbuf_pkthdr_setheader(m, frame_header); /* * If the interface is learning, and the source * address is valid and not multicast, record * the address. */ if ((bif->bif_flags & IFBIF_LEARNING) != 0 && ETHER_IS_MULTICAST(eh->ether_shost) == 0 && (eh->ether_shost[0] | eh->ether_shost[1] | eh->ether_shost[2] | eh->ether_shost[3] | eh->ether_shost[4] | eh->ether_shost[5]) != 0) { (void) bridge_rtupdate(sc, eh->ether_shost, vlan, bif, 0, IFBAF_DYNAMIC); } BRIDGE_BPF_MTAP_INPUT(sc, m); (void) mbuf_setdata(m, (char *)mbuf_data(m) + ETHER_HDR_LEN, mbuf_len(m) - ETHER_HDR_LEN); (void) mbuf_pkthdr_adjustlen(m, - ETHER_HDR_LEN); (void) ifnet_stat_increment_in(bifp, 1, mbuf_pkthdr_len(m), 0); BRIDGE_UNLOCK(sc); #if BRIDGE_DEBUG if (_if_brige_debug) printf( "bridge_input: %s%d packet for bridge\n", ifnet_name(sc->sc_ifp), ifnet_unit(sc->sc_ifp)); #endif /* BRIDGE_DEBUG */ dlil_input_packet_list(bifp, m); return EJUSTRETURN; } /* * if the destination of the packet is for the MAC address of * the member interface itself, then we don't need to forward * it -- just pass it back. Note that it'll likely just be * dropped by the stack, but if something else is bound to * the interface directly (for example, the wireless stats * protocol -- although that actually uses BPF right now), * then it will consume the packet * * ALSO, note that we do this check AFTER checking for the * bridge's own MAC address, because the bridge may be * using the SAME MAC address as one of its interfaces */ if (memcmp(eh->ether_dhost, ifnet_lladdr(ifp), ETHER_ADDR_LEN) == 0) { #ifdef VERY_VERY_VERY_DIAGNOSTIC printf("bridge_input: not forwarding packet bound for member interface\n" ); #endif BRIDGE_UNLOCK(sc); return 0; } /* Now check the all bridge members. */ TAILQ_FOREACH(bif2, &sc->sc_iflist, bif_next) { GRAB_OUR_PACKETS(bif2->bif_ifp) } #undef OR_CARP_CHECK_WE_ARE_DST #undef OR_CARP_CHECK_WE_ARE_SRC #undef OR_PFIL_HOOKED_INET6 #undef GRAB_OUR_PACKETS /* * Perform the bridge forwarding function. * * Note that bridge_forward calls BRIDGE_UNLOCK */ bridge_forward(sc, bif, m); return EJUSTRETURN; } /* * 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 ifnet *src_if, struct mbuf *m, int runfilt) { #ifndef PFIL_HOOKS #pragma unused(runfilt) #endif struct bridge_iflist *dbif, *sbif; struct mbuf *mc; struct ifnet *dst_if; int error = 0, used = 0; sbif = bridge_lookup_member_if(sc, src_if); BRIDGE_LOCK2REF(sc, error); if (error) { m_freem(m); return; } #ifdef PFIL_HOOKS /* Filter on the bridge interface before broadcasting */ if (runfilt && (PFIL_HOOKED(&inet_pfil_hook) #ifdef INET6 || PFIL_HOOKED(&inet6_pfil_hook) #endif /* INET6 */ )) { if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) goto out; if (m == NULL) goto out; } #endif /* PFIL_HOOKS */ TAILQ_FOREACH(dbif, &sc->sc_iflist, bif_next) { dst_if = dbif->bif_ifp; if (dst_if == src_if) continue; /* Private segments can not talk to each other */ if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) continue; if ((dbif->bif_flags & IFBIF_STP) && dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) continue; if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && (m->m_flags & (M_BCAST|M_MCAST)) == 0) continue; if ((dst_if->if_flags & IFF_RUNNING) == 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(sc->sc_ifp, 0, 0, 1); continue; } } #ifdef PFIL_HOOKS /* * Filter on the output interface. Pass a NULL bridge interface * pointer so we do not redundantly filter on the bridge for * each interface we broadcast on. */ if (runfilt && (PFIL_HOOKED(&inet_pfil_hook) #ifdef INET6 || PFIL_HOOKED(&inet6_pfil_hook) #endif )) { 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); continue; } } if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) continue; if (mc == NULL) continue; } #endif /* PFIL_HOOKS */ bridge_enqueue(sc, dst_if, mc); } if (used == 0) m_freem(m); #ifdef PFIL_HOOKS out: #endif /* PFIL_HOOKS */ BRIDGE_UNREF(sc); } /* * 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, 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; } bridge_enqueue(sc, dst_if, mc); } } /* * bridge_rtupdate: * * Add a bridge routing entry. */ static int bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, struct bridge_iflist *bif, int setflags, uint8_t flags) { struct bridge_rtnode *brt; int error; BRIDGE_LOCK_ASSERT(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) return (ENOMEM); if (bif->bif_flags & 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++; } 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) { struct timespec now; nanouptime(&now); brt->brt_expire = now.tv_sec + sc->sc_brttimeout; } if (setflags) brt->brt_flags = flags; return (0); } /* * bridge_rtlookup: * * Lookup the destination interface for an address. */ static struct ifnet * bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) { struct bridge_rtnode *brt; BRIDGE_LOCK_ASSERT(sc); if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) return (NULL); return (brt->brt_ifp); } /* * 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(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_timer: * * Aging timer for the bridge. */ static void bridge_timer(void *arg) { struct bridge_softc *sc = arg; BRIDGE_LOCK(sc); bridge_rtage(sc); BRIDGE_UNLOCK(sc); if (sc->sc_ifp->if_flags & IFF_RUNNING) { struct timespec ts; ts.tv_sec = bridge_rtable_prune_period; ts.tv_nsec = 0; bsd_timeout(bridge_timer, sc, &ts); } } /* * bridge_rtage: * * Perform an aging cycle. */ static void bridge_rtage(struct bridge_softc *sc) { struct bridge_rtnode *brt, *nbrt; BRIDGE_LOCK_ASSERT(sc); LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { struct timespec now; nanouptime(&now); if ((unsigned long)now.tv_sec >= brt->brt_expire) bridge_rtnode_destroy(sc, brt); } } } /* * 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(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, uint16_t vlan) { struct bridge_rtnode *brt; int found = 0; BRIDGE_LOCK_ASSERT(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 speicifc member interface. */ static void bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) { struct bridge_rtnode *brt, *nbrt; BRIDGE_LOCK_ASSERT(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) { int i; sc->sc_rthash = _MALLOC(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, M_DEVBUF, M_NOWAIT); if (sc->sc_rthash == NULL) return (ENOMEM); for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) LIST_INIT(&sc->sc_rthash[i]); sc->sc_rthash_key = random(); LIST_INIT(&sc->sc_rtlist); return (0); } /* * 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)); _FREE(sc->sc_rthash, M_DEVBUF); } /* * 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) { 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); } #undef mix static int bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) { 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, uint16_t vlan) { struct bridge_rtnode *brt; uint32_t hash; int dir; BRIDGE_LOCK_ASSERT(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_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) { struct bridge_rtnode *lbrt; uint32_t hash; int dir; BRIDGE_LOCK_ASSERT(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) 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); #ifdef DIAGNOSTIC panic("bridge_rtnode_insert: impossible"); #endif out: LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); sc->sc_brtcnt++; 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(sc); LIST_REMOVE(brt, brt_hash); LIST_REMOVE(brt, brt_list); sc->sc_brtcnt--; brt->brt_dst->bif_addrcnt--; zfree(bridge_rtnode_pool, brt); } /* * 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 { LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { struct timespec now; nanouptime(&now); /* Cap the expiry time to 'age' */ if (brt->brt_ifp == ifp && brt->brt_expire > (unsigned long)now.tv_sec + age && (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) brt->brt_expire = (unsigned long)now.tv_sec + 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%d: state changed to %s on %s%d\n", ifnet_name(sc->sc_ifp), ifnet_unit(sc->sc_ifp), stpstates[state], ifnet_name(ifp), ifnet_unit(ifp)); } #ifdef PFIL_HOOKS /* * Send bridge packets through pfil if they are one of the types pfil can deal * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without * question.) If *bifp or *ifp are NULL then packet filtering is skipped for * that interface. */ static int bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) { int snap, error, i, hlen; struct ether_header *eh1, eh2; struct ip_fw_args args; struct ip *ip; struct llc llc1; u_int16_t ether_type; snap = 0; error = -1; /* Default error if not error == 0 */ #if 0 /* we may return with the IP fields swapped, ensure its not shared */ KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); #endif if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 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) { printf("%s: m_pullup failed\n", __func__); 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: if (pfil_ipfw_arp == 0) return (0); /* Automatically pass */ break; case ETHERTYPE_IP: #ifdef INET6 case ETHERTYPE_IPV6: #endif /* INET6 */ break; default: /* * Check to see if the user wants to pass non-ip * packets, these will not be checked by pfil(9) and * passed unconditionally so the default is to drop. */ if (pfil_onlyip) goto bad; } /* 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 */ if (dir == PFIL_IN) { switch (ether_type) { case ETHERTYPE_IP: error = bridge_ip_checkbasic(mp); break; #ifdef INET6 case ETHERTYPE_IPV6: error = bridge_ip6_checkbasic(mp); break; #endif /* INET6 */ default: error = 0; } if (error) goto bad; } if (IPFW_LOADED && pfil_ipfw != 0 && dir == PFIL_OUT && ifp != NULL) { error = -1; args.rule = ip_dn_claim_rule(*mp); if (args.rule != NULL && fw_one_pass) goto ipfwpass; /* packet already partially processed */ args.m = *mp; args.oif = ifp; args.next_hop = NULL; args.eh = &eh2; args.inp = NULL; /* used by ipfw uid/gid/jail rules */ i = ip_fw_chk_ptr(&args); *mp = args.m; if (*mp == NULL) return (error); if (DUMMYNET_LOADED && (i == IP_FW_DUMMYNET)) { /* put the Ethernet header back on */ M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); if (*mp == NULL) return (error); bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); /* * Pass the pkt to dummynet, which consumes it. The * packet will return to us via bridge_dummynet(). */ args.oif = ifp; ip_dn_io_ptr(mp, DN_TO_IFB_FWD, &args); return (error); } if (i != IP_FW_PASS) /* drop */ goto bad; } ipfwpass: error = 0; /* * Run the packet through pfil */ 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); /* * Run pfil on the member interface and the bridge, both can * be skipped by clearing pfil_member or pfil_bridge. * * Keep the order: * in_if -> bridge_if -> out_if */ if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, dir, NULL); if (*mp == NULL || error != 0) /* filter may consume */ break; if (pfil_member && ifp != NULL) error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, dir, NULL); if (*mp == NULL || error != 0) /* filter may consume */ break; if (pfil_bridge && dir == PFIL_IN && bifp != NULL) error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, dir, NULL); if (*mp == NULL || error != 0) /* filter may consume */ break; /* check if we need to fragment the packet */ if (pfil_member && ifp != NULL && dir == PFIL_OUT) { i = (*mp)->m_pkthdr.len; if (i > ifp->if_mtu) { error = bridge_fragment(ifp, *mp, &eh2, snap, &llc1); return (error); } } /* Recalculate the ip checksum and restore byte ordering */ ip = mtod(*mp, struct ip *); hlen = ip->ip_hl << 2; if (hlen < 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; #ifdef INET6 case ETHERTYPE_IPV6: if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp, dir, NULL); if (*mp == NULL || error != 0) /* filter may consume */ break; if (pfil_member && ifp != NULL) error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp, dir, NULL); if (*mp == NULL || error != 0) /* filter may consume */ break; if (pfil_bridge && dir == PFIL_IN && bifp != NULL) error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp, dir, NULL); break; #endif 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); if (*mp == NULL) return (error); bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); } M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); if (*mp == NULL) return (error); bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); return (0); bad: m_freem(*mp); *mp = NULL; return (error); } /* * 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) { if ((m = m_copyup(m, sizeof(struct ip), (max_linkhdr + 3) & ~3)) == NULL) { /* XXXJRT new stat, please */ ipstat.ips_toosmall++; goto bad; } } else if (__predict_false(m->m_len < sizeof (struct ip))) { 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->ip_v != IPVERSION) { ipstat.ips_badvers++; goto bad; } hlen = ip->ip_hl << 2; if (hlen < 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); } #ifdef INET6 /* * 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; if ((m = m_copyup(m, sizeof(struct ip6_hdr), (max_linkhdr + 3) & ~3)) == NULL) { /* XXXJRT new stat, please */ ip6stat.ip6s_toosmall++; in6_ifstat_inc(inifp, ifs6_in_hdrerr); goto bad; } } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 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); } #endif /* INET6 */ /* * bridge_fragment: * * Return a fragmented mbuf chain. */ static int bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh, int snap, struct llc *llc) { struct mbuf *m0; struct ip *ip; int error = -1; if (m->m_len < sizeof(struct ip) && (m = m_pullup(m, sizeof(struct ip))) == NULL) goto out; ip = mtod(m, struct ip *); error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist, CSUM_DELAY_IP); if (error) goto out; /* walk the chain and re-add the Ethernet header */ for (m0 = m; m0; m0 = m0->m_nextpkt) { if (error == 0) { if (snap) { M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT); if (m0 == NULL) { error = ENOBUFS; continue; } bcopy(llc, mtod(m0, caddr_t), sizeof(struct llc)); } M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT); if (m0 == NULL) { error = ENOBUFS; continue; } bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN); } else m_freem(m); } if (error == 0) ipstat.ips_fragmented++; return (error); out: if (m != NULL) m_freem(m); return (error); } #endif /* PFIL_HOOKS */ static errno_t bridge_set_bpf_tap(ifnet_t ifp, bpf_tap_mode mode, bpf_packet_func bpf_callback) { struct bridge_softc *sc = (struct bridge_softc *)ifnet_softc(ifp); //printf("bridge_set_bpf_tap ifp %p mode %d\n", ifp, mode); /* TBD locking */ if (sc == NULL || (sc->sc_flags & SCF_DETACHING)) { return ENODEV; } switch (mode) { case BPF_TAP_DISABLE: sc->sc_bpf_input = sc->sc_bpf_output = NULL; break; case BPF_TAP_INPUT: sc->sc_bpf_input = bpf_callback; break; case BPF_TAP_OUTPUT: sc->sc_bpf_output = bpf_callback; break; case BPF_TAP_INPUT_OUTPUT: sc->sc_bpf_input = sc->sc_bpf_output = bpf_callback; break; default: break; } return 0; } static void bridge_detach(ifnet_t ifp) { struct bridge_softc *sc = (struct bridge_softc *)ifnet_softc(ifp); bstp_detach(&sc->sc_stp); /* 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_free(sc->sc_mtx, bridge_lock_grp); _FREE(sc, M_DEVBUF); return; } __private_extern__ errno_t bridge_bpf_input(ifnet_t ifp, struct mbuf *m) { struct bridge_softc *sc = (struct bridge_softc *)ifnet_softc(ifp); if (sc->sc_bpf_input) { if (mbuf_pkthdr_rcvif(m) != ifp) printf("bridge_bpf_input rcvif: %p != ifp %p\n", mbuf_pkthdr_rcvif(m), ifp); (*sc->sc_bpf_input)(ifp, m); } return 0; } __private_extern__ errno_t bridge_bpf_output(ifnet_t ifp, struct mbuf *m) { struct bridge_softc *sc = (struct bridge_softc *)ifnet_softc(ifp); if (sc->sc_bpf_output) { (*sc->sc_bpf_output)(ifp, m); } return 0; } |