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1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 | /* * Copyright (c) 2019-2021 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@ */ #if SKYWALK #include <sys/param.h> #include <sys/kernel.h> #include <sys/malloc.h> #include <sys/mbuf.h> #include <sys/queue.h> #include <sys/socket.h> #include <sys/sockio.h> #include <sys/sysctl.h> #include <sys/systm.h> #include <sys/kern_event.h> #include <sys/mcache.h> #include <sys/syslog.h> #include <net/bpf.h> #include <net/ethernet.h> #include <net/if.h> #include <net/if_vlan_var.h> #include <net/if_arp.h> #include <net/if_dl.h> #include <net/if_ether.h> #include <net/if_types.h> #include <libkern/OSAtomic.h> #include <net/dlil.h> #include <net/kpi_interface.h> #include <net/kpi_protocol.h> #include <kern/locks.h> #include <kern/zalloc.h> #ifdef INET #include <netinet/in.h> #include <netinet/if_ether.h> #endif #include <net/if_media.h> #include <net/ether_if_module.h> #include <skywalk/os_skywalk_private.h> #include <skywalk/nexus/netif/nx_netif.h> #include <skywalk/channel/channel_var.h> static boolean_t is_power_of_two(unsigned int val) { return (val & (val - 1)) == 0; } #define HEADLESS_ZERO_IFNAME "zero" #define HEADLESS_NULL_IFNAME "null" SYSCTL_DECL(_net_link); SYSCTL_NODE(_net_link, OID_AUTO, headless, CTLFLAG_RW | CTLFLAG_LOCKED, 0, "headless interface"); static int if_headless_nxattach = 0; SYSCTL_INT(_net_link_headless, OID_AUTO, nxattach, CTLFLAG_RW | CTLFLAG_LOCKED, &if_headless_nxattach, 0, "headless interface auto-attach nexus"); static int if_headless_debug = 0; SYSCTL_INT(_net_link_headless, OID_AUTO, debug, CTLFLAG_RW | CTLFLAG_LOCKED, &if_headless_debug, 0, "headless interface debug logs"); static int if_headless_multibuflet = 0; SYSCTL_INT(_net_link_headless, OID_AUTO, multibuflet, CTLFLAG_RW | CTLFLAG_LOCKED, &if_headless_multibuflet, 0, "headless interface using multi-buflet packets"); static int if_headless_packet_length = 1500; SYSCTL_INT(_net_link_headless, OID_AUTO, packet_length, CTLFLAG_RW | CTLFLAG_LOCKED, &if_headless_packet_length, 0, "headless interface packet length"); static int if_headless_create_payload = 0; SYSCTL_INT(_net_link_headless, OID_AUTO, create_payload, CTLFLAG_RW | CTLFLAG_LOCKED, &if_headless_create_payload, 0, "headless interface create payload data or not"); /* * SIOCSDRVSPEC */ enum { IF_HEADLESS_S_CMD_NONE = 0, IF_HEADLESS_S_CMD_SET_MEDIA = 1, }; #define IF_HEADLESS_MEDIA_LIST_MAX 27 struct if_headless_media { int32_t iffm_current; uint32_t iffm_count; uint32_t iffm_reserved[3]; int32_t iffm_list[IF_HEADLESS_MEDIA_LIST_MAX]; }; struct if_headless_request { uint64_t iffr_reserved[4]; union { char iffru_buf[128]; /* stable size */ struct if_headless_media iffru_media; } iffr_u; #define iffr_media iffr_u.iffru_media }; /* sysctl net.link.headless.tx_headroom */ #define headless_TX_HEADROOM_MAX 32 static uint16_t if_headless_tx_headroom = 0; extern void if_headless_init(void); static int headless_tx_headroom_sysctl SYSCTL_HANDLER_ARGS { #pragma unused(oidp, arg1, arg2) uint16_t new_value; int changed; int error; error = sysctl_io_number(req, if_headless_tx_headroom, sizeof(if_headless_tx_headroom), &new_value, &changed); if (error == 0 && changed != 0) { if (new_value > headless_TX_HEADROOM_MAX || (new_value % 8) != 0) { return EINVAL; } if_headless_tx_headroom = new_value; } return 0; } SYSCTL_PROC(_net_link_headless, OID_AUTO, tx_headroom, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, 0, 0, headless_tx_headroom_sysctl, "IU", "headless ethernet Tx headroom"); /* sysctl net.link.headless.max_mtu */ #define headless_MAX_MTU_DEFAULT 2048 #define headless_MAX_MTU_MAX ((16 * 1024) - ETHER_HDR_LEN) static unsigned int if_headless_max_mtu = headless_MAX_MTU_DEFAULT; /* sysctl net.link.headless.buflet_size */ #define headless_BUFLET_SIZE_MIN 512 #define headless_BUFLET_SIZE_MAX 2048 static unsigned int if_headless_buflet_size = headless_BUFLET_SIZE_MIN; static int headless_max_mtu_sysctl SYSCTL_HANDLER_ARGS { #pragma unused(oidp, arg1, arg2) unsigned int new_value; int changed; int error; error = sysctl_io_number(req, if_headless_max_mtu, sizeof(if_headless_max_mtu), &new_value, &changed); if (error == 0 && changed != 0) { if (new_value > headless_MAX_MTU_MAX || new_value < ETHERMTU || new_value <= if_headless_buflet_size) { return EINVAL; } if_headless_max_mtu = new_value; } return 0; } SYSCTL_PROC(_net_link_headless, OID_AUTO, max_mtu, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, 0, 0, headless_max_mtu_sysctl, "IU", "headless interface maximum MTU"); static int headless_buflet_size_sysctl SYSCTL_HANDLER_ARGS { #pragma unused(oidp, arg1, arg2) unsigned int new_value; int changed; int error; error = sysctl_io_number(req, if_headless_buflet_size, sizeof(if_headless_buflet_size), &new_value, &changed); if (error == 0 && changed != 0) { /* must be a power of 2 between min and max */ if (new_value > headless_BUFLET_SIZE_MAX || new_value < headless_BUFLET_SIZE_MIN || !is_power_of_two(new_value) || new_value >= if_headless_max_mtu) { return EINVAL; } if_headless_buflet_size = new_value; } return 0; } SYSCTL_PROC(_net_link_headless, OID_AUTO, buflet_size, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, 0, 0, headless_buflet_size_sysctl, "IU", "headless interface buflet size"); /** ** virtual ethernet structures, types **/ #define IFF_NUM_TX_RINGS_WMM_MODE 4 #define IFF_NUM_RX_RINGS_WMM_MODE 1 #define IFF_MAX_TX_RINGS IFF_NUM_TX_RINGS_WMM_MODE #define IFF_MAX_RX_RINGS IFF_NUM_RX_RINGS_WMM_MODE typedef uint16_t iff_flags_t; #define IFF_FLAGS_HWCSUM 0x0001 #define IFF_FLAGS_BSD_MODE 0x0002 #define IFF_FLAGS_DETACHING 0x0004 #define IFF_FLAGS_WMM_MODE 0x0008 #define IFF_FLAGS_MULTIBUFLETS 0x0010 #define IFF_FLAGS_COPYPKT_MODE 0x0020 typedef struct { kern_pbufpool_t fpp_pp; uint32_t fpp_retain_count; } headless_packet_pool, *headless_packet_pool_t; typedef struct { uuid_t fnx_provider; uuid_t fnx_instance; } headless_nx, *headless_nx_t; struct if_headless { struct if_clone * iff_cloner; char iff_name[IFNAMSIZ]; /* our unique id */ ifnet_t iff_ifp; iff_flags_t iff_flags; uint32_t iff_retain_count; ifnet_t iff_peer; /* the other end */ int iff_media_current; int iff_media_active; uint32_t iff_media_count; int iff_media_list[IF_HEADLESS_MEDIA_LIST_MAX]; struct mbuf * iff_pending_tx_packet; boolean_t iff_start_busy; unsigned int iff_max_mtu; headless_nx iff_nx; kern_channel_ring_t iff_rx_ring[IFF_MAX_RX_RINGS]; kern_channel_ring_t iff_tx_ring[IFF_MAX_TX_RINGS]; thread_call_t iff_doorbell_tcall; boolean_t iff_tcall_active; boolean_t iff_waiting_for_tcall; boolean_t iff_channel_connected; headless_packet_pool_t iff_fpp; uint16_t iff_tx_headroom; }; typedef struct if_headless * __single if_headless_ref; static if_headless_ref ifnet_get_if_headless(ifnet_t ifp); #define HEADLESS_DPRINTF(fmt, ...) \ { if (if_headless_debug != 0) printf("%s " fmt, __func__, ## __VA_ARGS__); } static inline void headless_set_detaching(if_headless_ref headlessif) { headlessif->iff_flags |= IFF_FLAGS_DETACHING; } static inline boolean_t headless_is_detaching(if_headless_ref headlessif) { return (headlessif->iff_flags & IFF_FLAGS_DETACHING) != 0; } static inline boolean_t headless_using_multibuflets(if_headless_ref headlessif) { return (headlessif->iff_flags & IFF_FLAGS_MULTIBUFLETS) != 0; } #define HEADLESS_MAXUNIT IF_MAXUNIT #define HEADLESS_ZONE_MAX_ELEM MIN(IFNETS_MAX, HEADLESS_MAXUNIT) static int headless_clone_create(struct if_clone *, u_int32_t, void *); static int headless_clone_destroy(ifnet_t); static int headless_ioctl(ifnet_t ifp, u_long cmd, void * addr); static void headless_if_free(ifnet_t ifp); static void headless_ifnet_set_attrs(if_headless_ref headlessif, ifnet_t ifp); static void headless_free(if_headless_ref headlessif); static struct if_clone headless_zero_cloner = IF_CLONE_INITIALIZER(HEADLESS_ZERO_IFNAME, headless_clone_create, headless_clone_destroy, 0, HEADLESS_MAXUNIT); static struct if_clone headless_null_cloner = IF_CLONE_INITIALIZER(HEADLESS_NULL_IFNAME, headless_clone_create, headless_clone_destroy, 0, HEADLESS_MAXUNIT); static void interface_link_event(ifnet_t ifp, u_int32_t event_code); /* some media words to pretend to be ethernet */ static int default_media_words[] = { IFM_MAKEWORD(IFM_ETHER, 0, 0, 0), IFM_MAKEWORD(IFM_ETHER, IFM_10G_T, IFM_FDX, 0), IFM_MAKEWORD(IFM_ETHER, IFM_2500_T, IFM_FDX, 0), IFM_MAKEWORD(IFM_ETHER, IFM_5000_T, IFM_FDX, 0), }; #define default_media_words_count (sizeof(default_media_words) \ / sizeof (default_media_words[0])) /** ** veth locks **/ static LCK_GRP_DECLARE(headless_lck_grp, "headless"); static LCK_MTX_DECLARE(headless_lck_mtx, &headless_lck_grp); static inline void headless_lock(void) { lck_mtx_lock(&headless_lck_mtx); } static inline void headless_unlock(void) { lck_mtx_unlock(&headless_lck_mtx); } static inline unsigned int headless_max_mtu(ifnet_t ifp) { if_headless_ref headlessif; unsigned int max_mtu = ETHERMTU; headless_lock(); headlessif = ifnet_get_if_headless(ifp); if (headlessif != NULL) { max_mtu = headlessif->iff_max_mtu; } headless_unlock(); return max_mtu; } static void headless_packet_pool_free(headless_packet_pool_t fpp) { kern_pbufpool_destroy(fpp->fpp_pp); kfree_type(headless_packet_pool, fpp); } static void headless_free(if_headless_ref headlessif) { assert(headlessif->iff_retain_count == 0); if (headlessif->iff_fpp != NULL) { headless_packet_pool_free(headlessif->iff_fpp); } HEADLESS_DPRINTF("%s\n", headlessif->iff_name); kfree_type(struct if_headless, headlessif); } static void headless_release(if_headless_ref headlessif) { u_int32_t old_retain_count; old_retain_count = OSDecrementAtomic(&headlessif->iff_retain_count); switch (old_retain_count) { case 0: assert(old_retain_count != 0); break; case 1: headless_free(headlessif); break; default: break; } return; } static void headless_retain(if_headless_ref headlessif) { OSIncrementAtomic(&headlessif->iff_retain_count); } static int headless_seg_ctor_fn(const kern_pbufpool_t pp, const kern_segment_t buf_seg, const IOSKMemoryDescriptor buf_desc) { #pragma unused(pp, buf_seg, buf_desc) return 0; } static void headless_seg_dtor_fn(const kern_pbufpool_t pp, const kern_segment_t buf_seg, const IOSKMemoryDescriptor buf_desc) { #pragma unused(pp, buf_seg, buf_desc) } static headless_packet_pool_t headless_packet_pool_alloc(boolean_t multi_buflet, unsigned int max_mtu) { headless_packet_pool_t fpp = NULL; errno_t error; struct kern_pbufpool * pp __single; struct kern_pbufpool_init pp_init; bzero(&pp_init, sizeof(pp_init)); pp_init.kbi_version = KERN_PBUFPOOL_CURRENT_VERSION; pp_init.kbi_flags |= KBIF_USER_ACCESS; pp_init.kbi_flags |= KBIF_VIRTUAL_DEVICE; (void)snprintf((char *)pp_init.kbi_name, sizeof(pp_init.kbi_name), "%s", "headless ethernet"); pp_init.kbi_packets = 4096; /* XXX make this configurable */ if (multi_buflet) { pp_init.kbi_bufsize = if_headless_buflet_size; pp_init.kbi_max_frags = howmany(max_mtu, if_headless_buflet_size); pp_init.kbi_buflets = pp_init.kbi_packets * pp_init.kbi_max_frags; pp_init.kbi_flags |= KBIF_BUFFER_ON_DEMAND; } else { pp_init.kbi_bufsize = max_mtu; pp_init.kbi_max_frags = 1; pp_init.kbi_buflets = pp_init.kbi_packets; } pp_init.kbi_buf_seg_size = skmem_usr_buf_seg_size; if (skywalk_netif_direct_enabled()) { pp_init.kbi_flags |= KBIF_USER_ACCESS; } pp_init.kbi_buf_seg_ctor = headless_seg_ctor_fn; pp_init.kbi_buf_seg_dtor = headless_seg_dtor_fn; pp_init.kbi_ctx = NULL; pp_init.kbi_ctx_retain = NULL; pp_init.kbi_ctx_release = NULL; error = kern_pbufpool_create(&pp_init, &pp, NULL); if (error != 0) { printf("%s: kern_pbufpool_create failed %d\n", __func__, error); } else { fpp = kalloc_type(headless_packet_pool, Z_WAITOK | Z_ZERO); fpp->fpp_pp = pp; fpp->fpp_retain_count = 1; } return fpp; } /** ** nexus netif domain provider **/ static errno_t headless_nxdp_init(kern_nexus_domain_provider_t domprov) { #pragma unused(domprov) return 0; } static void headless_nxdp_fini(kern_nexus_domain_provider_t domprov) { #pragma unused(domprov) } static uuid_t headless_nx_dom_prov; static errno_t headless_register_nexus_domain_provider(void) { const struct kern_nexus_domain_provider_init dp_init = { .nxdpi_version = KERN_NEXUS_DOMAIN_PROVIDER_CURRENT_VERSION, .nxdpi_flags = 0, .nxdpi_init = headless_nxdp_init, .nxdpi_fini = headless_nxdp_fini }; errno_t err = 0; nexus_domain_provider_name_t headless_provider_name = "com.apple.headless"; /* headless_nxdp_init() is called before this function returns */ err = kern_nexus_register_domain_provider(NEXUS_TYPE_NET_IF, headless_provider_name, &dp_init, sizeof(dp_init), &headless_nx_dom_prov); if (err != 0) { printf("%s: failed to register domain provider\n", __func__); return err; } return 0; } /** ** netif nexus routines **/ static if_headless_ref headless_nexus_context(kern_nexus_t nexus) { if_headless_ref headlessif; headlessif = (if_headless_ref)kern_nexus_get_context(nexus); assert(headlessif != NULL); return headlessif; } static errno_t headless_nx_ring_init(kern_nexus_provider_t nxprov, kern_nexus_t nexus, kern_channel_t channel, kern_channel_ring_t ring, boolean_t is_tx_ring, void **ring_ctx) { if_headless_ref headlessif; #pragma unused(nxprov, channel, ring_ctx) headless_lock(); headlessif = headless_nexus_context(nexus); if (headless_is_detaching(headlessif)) { headless_unlock(); return 0; } if (is_tx_ring) { assert(headlessif->iff_tx_ring[0] == NULL); headlessif->iff_tx_ring[0] = ring; } else { assert(headlessif->iff_rx_ring[0] == NULL); headlessif->iff_rx_ring[0] = ring; } headless_unlock(); HEADLESS_DPRINTF("%s: %s ring init\n", headlessif->iff_name, is_tx_ring ? "TX" : "RX"); return 0; } static void headless_nx_ring_fini(kern_nexus_provider_t nxprov, kern_nexus_t nexus, kern_channel_ring_t ring) { #pragma unused(nxprov, ring) if_headless_ref headlessif; thread_call_t tcall __single = NULL; headless_lock(); headlessif = headless_nexus_context(nexus); if (headlessif->iff_rx_ring[0] == ring) { headlessif->iff_rx_ring[0] = NULL; HEADLESS_DPRINTF("%s: RX ring fini\n", headlessif->iff_name); } else if (headlessif->iff_tx_ring[0] == ring) { tcall = headlessif->iff_doorbell_tcall; headlessif->iff_doorbell_tcall = NULL; headlessif->iff_tx_ring[0] = NULL; } headless_unlock(); if (tcall != NULL) { boolean_t success; success = thread_call_cancel_wait(tcall); HEADLESS_DPRINTF("%s: thread_call_cancel %s\n", headlessif->iff_name, success ? "SUCCESS" : "FAILURE"); if (!success) { headless_lock(); if (headlessif->iff_tcall_active) { headlessif->iff_waiting_for_tcall = TRUE; HEADLESS_DPRINTF("%s: *waiting for threadcall\n", headlessif->iff_name); do { msleep(headlessif, &headless_lck_mtx, PZERO, "headless threadcall", 0); } while (headlessif->iff_tcall_active); HEADLESS_DPRINTF("%s: ^threadcall done\n", headlessif->iff_name); headlessif->iff_waiting_for_tcall = FALSE; } headless_unlock(); } success = thread_call_free(tcall); HEADLESS_DPRINTF("%s: thread_call_free %s\n", headlessif->iff_name, success ? "SUCCESS" : "FAILURE"); headless_release(headlessif); assert(success == TRUE); } } static errno_t headless_nx_pre_connect(kern_nexus_provider_t nxprov, proc_t proc, kern_nexus_t nexus, nexus_port_t port, kern_channel_t channel, void **channel_context) { #pragma unused(nxprov, proc, nexus, port, channel, channel_context) return 0; } static errno_t headless_nx_connected(kern_nexus_provider_t nxprov, kern_nexus_t nexus, kern_channel_t channel) { #pragma unused(nxprov, channel) if_headless_ref headlessif; headlessif = headless_nexus_context(nexus); headless_lock(); if (headless_is_detaching(headlessif)) { headless_unlock(); return EBUSY; } headless_retain(headlessif); headlessif->iff_channel_connected = TRUE; headless_unlock(); HEADLESS_DPRINTF("%s: connected channel %p\n", headlessif->iff_name, channel); return 0; } static void headless_nx_pre_disconnect(kern_nexus_provider_t nxprov, kern_nexus_t nexus, kern_channel_t channel) { #pragma unused(nxprov, channel) if_headless_ref headlessif; headlessif = headless_nexus_context(nexus); HEADLESS_DPRINTF("%s: pre-disconnect channel %p\n", headlessif->iff_name, channel); /* Quiesce the interface and flush any pending outbound packets. */ if_down(headlessif->iff_ifp); headless_lock(); headlessif->iff_channel_connected = FALSE; headless_unlock(); } static void headless_nx_disconnected(kern_nexus_provider_t nxprov, kern_nexus_t nexus, kern_channel_t channel) { #pragma unused(nxprov, channel) if_headless_ref headlessif; headlessif = headless_nexus_context(nexus); HEADLESS_DPRINTF("%s: disconnected channel %p\n", headlessif->iff_name, channel); headless_release(headlessif); } static errno_t headless_nx_slot_init(kern_nexus_provider_t nxprov, kern_nexus_t nexus, kern_channel_ring_t ring, kern_channel_slot_t slot, uint32_t slot_index, struct kern_slot_prop **slot_prop_addr, void **slot_context) { #pragma unused(nxprov, nexus, ring, slot, slot_index, slot_prop_addr, slot_context) return 0; } static void headless_nx_slot_fini(kern_nexus_provider_t nxprov, kern_nexus_t nexus, kern_channel_ring_t ring, kern_channel_slot_t slot, uint32_t slot_index) { #pragma unused(nxprov, nexus, ring, slot, slot_index) } static errno_t headless_nx_sync_tx(kern_nexus_provider_t nxprov, kern_nexus_t nexus, kern_channel_ring_t tx_ring, uint32_t flags) { #pragma unused(nxprov) if_headless_ref headlessif; ifnet_t ifp; kern_channel_slot_t last_tx_slot = NULL; struct kern_channel_ring_stat_increment stats = { .kcrsi_slots_transferred = 0, .kcrsi_bytes_transferred = 0 }; kern_channel_slot_t tx_slot; struct netif_stats *nifs = &NX_NETIF_PRIVATE(nexus)->nif_stats; STATS_INC(nifs, NETIF_STATS_TX_SYNC); headlessif = headless_nexus_context(nexus); HEADLESS_DPRINTF("%s ring %d flags 0x%x\n", headlessif->iff_name, tx_ring->ckr_ring_id, flags); headless_lock(); if (headless_is_detaching(headlessif) || !headlessif->iff_channel_connected) { headless_unlock(); return 0; } headless_unlock(); ifp = headlessif->iff_ifp; tx_slot = kern_channel_get_next_slot(tx_ring, NULL, NULL); while (tx_slot != NULL) { kern_packet_t ph; /* detach the packet from the TX ring */ ph = kern_channel_slot_get_packet(tx_ring, tx_slot); assert(ph != 0); kern_channel_slot_detach_packet(tx_ring, tx_slot, ph); kern_pbufpool_free(headlessif->iff_fpp->fpp_pp, ph); last_tx_slot = tx_slot; tx_slot = kern_channel_get_next_slot(tx_ring, tx_slot, NULL); STATS_INC(nifs, NETIF_STATS_TX_PACKETS); } if (last_tx_slot != NULL) { kern_channel_advance_slot(tx_ring, last_tx_slot); kern_channel_increment_ring_net_stats(tx_ring, ifp, &stats); } return 0; } static errno_t headless_nx_sync_rx_null(kern_nexus_provider_t nxprov, kern_nexus_t nexus, kern_channel_ring_t rx_ring, uint32_t flags) { #pragma unused(nxprov, rx_ring, flags) if_headless_ref headlessif; struct netif_stats *nifs = &NX_NETIF_PRIVATE(nexus)->nif_stats; headlessif = headless_nexus_context(nexus); HEADLESS_DPRINTF("%s:\n", headlessif->iff_name); STATS_INC(nifs, NETIF_STATS_RX_SYNC); return 0; } static errno_t headless_nx_sync_rx(kern_nexus_provider_t nxprov, kern_nexus_t nexus, kern_channel_ring_t rx_ring, uint32_t flags) { #pragma unused(nxprov) if_headless_ref headlessif; ifnet_t ifp; kern_channel_slot_t last_rx_slot = NULL; struct kern_channel_ring_stat_increment stats = { .kcrsi_slots_transferred = 0, .kcrsi_bytes_transferred = 0 }; kern_channel_slot_t rx_slot; struct netif_stats *nifs = &NX_NETIF_PRIVATE(nexus)->nif_stats; kern_channel_reclaim(rx_ring); STATS_INC(nifs, NETIF_STATS_RX_SYNC); headlessif = headless_nexus_context(nexus); HEADLESS_DPRINTF("%s ring %d flags 0x%x\n", headlessif->iff_name, rx_ring->ckr_ring_id, flags); headless_lock(); if (headless_is_detaching(headlessif) || !headlessif->iff_channel_connected) { headless_unlock(); return 0; } headless_unlock(); ifp = headlessif->iff_ifp; rx_slot = kern_channel_get_next_slot(rx_ring, NULL, NULL); kern_pbufpool_t pp = headlessif->iff_fpp->fpp_pp; while (rx_slot != NULL) { kern_packet_t ph; kern_buflet_t buf = NULL; int err; err = kern_pbufpool_alloc(pp, 1, &ph); buf = kern_packet_get_next_buflet(ph, buf); kern_buflet_set_data_offset(buf, 0); if (if_headless_create_payload) { // This is a plain TCP SYN packet uint64_t * addr = __unsafe_forge_bidi_indexable(uint64_t *, kern_buflet_get_data_address(buf), kern_buflet_get_data_limit(buf)); uint64_t *u64 = addr; *(u64 + 0) = 0xc100d51dc3355b68ULL; *(u64 + 1) = 0x004500084019c564ULL; *(u64 + 2) = 0x0634004000004000ULL; *(u64 + 3) = 0x716111e3068d11c0ULL; *(u64 + 4) = 0xc0118d06e3116171ULL; *(u64 + 5) = 0x8a3700000000b002ULL; *(u64 + 6) = 0x02b000000000378aULL; *(u64 + 7) = 0x010106030301b405ULL; *(u64 + 8) = 0x000022cc5c940a08ULL; *(u64 + 9) = 0x0000040200000000ULL; } kern_buflet_set_data_length(buf, (uint16_t)if_headless_packet_length); err = kern_packet_set_headroom(ph, 0); ASSERT(err == 0); err = kern_packet_set_link_header_length(ph, 14); ASSERT(err == 0); kern_packet_finalize(ph); kern_channel_slot_attach_packet(rx_ring, rx_slot, ph); STATS_INC(nifs, NETIF_STATS_RX_PACKETS); last_rx_slot = rx_slot; rx_slot = kern_channel_get_next_slot(rx_ring, rx_slot, NULL); } if (last_rx_slot != NULL) { kern_channel_advance_slot(rx_ring, last_rx_slot); kern_channel_increment_ring_net_stats(rx_ring, ifp, &stats); } return 0; } static void headless_async_doorbell(thread_call_param_t arg0, thread_call_param_t arg1) { #pragma unused(arg1) errno_t error; if_headless_ref headlessif = (if_headless_ref)arg0; kern_channel_ring_t ring; boolean_t more; headless_lock(); ring = headlessif->iff_tx_ring[0]; if (headless_is_detaching(headlessif) || !headlessif->iff_channel_connected || ring == NULL) { goto done; } headlessif->iff_tcall_active = TRUE; headless_unlock(); error = kern_channel_tx_refill(ring, UINT32_MAX, UINT32_MAX, FALSE, &more); if (error != 0) { HEADLESS_DPRINTF("%s: TX refill failed %d\n", headlessif->iff_name, error); } else { HEADLESS_DPRINTF("%s: TX refilled\n", headlessif->iff_name); } headless_lock(); done: headlessif->iff_tcall_active = FALSE; if (headlessif->iff_waiting_for_tcall) { HEADLESS_DPRINTF("%s: threadcall waking up waiter\n", headlessif->iff_name); wakeup((caddr_t)headlessif); } headless_unlock(); } static void headless_schedule_async_doorbell(if_headless_ref headlessif) { thread_call_t __single tcall; headless_lock(); if (headless_is_detaching(headlessif) || !headlessif->iff_channel_connected) { headless_unlock(); return; } tcall = headlessif->iff_doorbell_tcall; if (tcall != NULL) { thread_call_enter(tcall); } else { tcall = thread_call_allocate_with_options(headless_async_doorbell, (thread_call_param_t)headlessif, THREAD_CALL_PRIORITY_KERNEL, THREAD_CALL_OPTIONS_ONCE); if (tcall == NULL) { printf("%s: %s tcall alloc failed\n", __func__, headlessif->iff_name); } else { headlessif->iff_doorbell_tcall = tcall; headless_retain(headlessif); thread_call_enter(tcall); } } headless_unlock(); } static errno_t headless_nx_tx_doorbell(kern_nexus_provider_t nxprov, kern_nexus_t nexus, kern_channel_ring_t ring, uint32_t flags) { #pragma unused(nxprov, ring, flags) errno_t error; if_headless_ref headlessif; headlessif = headless_nexus_context(nexus); HEADLESS_DPRINTF("%s\n", headlessif->iff_name); if ((flags & KERN_NEXUS_TXDOORBELLF_ASYNC_REFILL) == 0) { boolean_t more; /* synchronous tx refill */ error = kern_channel_tx_refill(ring, UINT32_MAX, UINT32_MAX, TRUE, &more); if (error != 0) { HEADLESS_DPRINTF("%s: TX refill (sync) %d\n", headlessif->iff_name, error); } else { HEADLESS_DPRINTF("%s: TX refilled (sync)\n", headlessif->iff_name); } } else { HEADLESS_DPRINTF("%s: schedule async refill\n", headlessif->iff_name); headless_schedule_async_doorbell(headlessif); } return 0; } static errno_t headless_netif_prepare(kern_nexus_t nexus, ifnet_t ifp) { if_headless_ref headlessif; headlessif = (if_headless_ref)kern_nexus_get_context(nexus); headless_ifnet_set_attrs(headlessif, ifp); return 0; } static errno_t create_netif_provider_and_instance(if_headless_ref headlessif, struct ifnet_init_eparams * init_params, ifnet_t *ifp, uuid_t * provider, uuid_t * instance) { errno_t err; nexus_controller_t controller = kern_nexus_shared_controller(); struct kern_nexus_net_init net_init; nexus_name_t provider_name; nexus_attr_t nexus_attr = NULL; struct kern_nexus_provider_init prov_init = { .nxpi_version = KERN_NEXUS_DOMAIN_PROVIDER_CURRENT_VERSION, .nxpi_flags = NXPIF_VIRTUAL_DEVICE, .nxpi_pre_connect = headless_nx_pre_connect, .nxpi_connected = headless_nx_connected, .nxpi_pre_disconnect = headless_nx_pre_disconnect, .nxpi_disconnected = headless_nx_disconnected, .nxpi_ring_init = headless_nx_ring_init, .nxpi_ring_fini = headless_nx_ring_fini, .nxpi_slot_init = headless_nx_slot_init, .nxpi_slot_fini = headless_nx_slot_fini, .nxpi_sync_tx = headless_nx_sync_tx, .nxpi_sync_rx = headless_nx_sync_rx, .nxpi_tx_doorbell = headless_nx_tx_doorbell, }; if (headlessif->iff_cloner == &headless_zero_cloner) { prov_init.nxpi_sync_rx = headless_nx_sync_rx; prov_init.nxpi_sync_tx = headless_nx_sync_tx; } else if (headlessif->iff_cloner == &headless_null_cloner) { prov_init.nxpi_sync_rx = headless_nx_sync_rx_null; prov_init.nxpi_sync_tx = headless_nx_sync_tx; } static_assert(IFF_MAX_RX_RINGS == 1); snprintf((char *)provider_name, sizeof(provider_name), "com.apple.netif.%s", headlessif->iff_name); err = kern_nexus_controller_register_provider(controller, headless_nx_dom_prov, provider_name, &prov_init, sizeof(prov_init), nexus_attr, provider); if (err != 0) { printf("%s register provider failed, error %d\n", __func__, err); goto failed; } bzero(&net_init, sizeof(net_init)); net_init.nxneti_version = KERN_NEXUS_NET_CURRENT_VERSION; net_init.nxneti_flags = 0; net_init.nxneti_eparams = init_params; net_init.nxneti_lladdr = NULL; net_init.nxneti_prepare = headless_netif_prepare; net_init.nxneti_rx_pbufpool = headlessif->iff_fpp->fpp_pp; net_init.nxneti_tx_pbufpool = headlessif->iff_fpp->fpp_pp; err = kern_nexus_controller_alloc_net_provider_instance(controller, *provider, headlessif, NULL, instance, &net_init, ifp); if (err != 0) { printf("%s alloc_net_provider_instance failed, %d\n", __func__, err); kern_nexus_controller_deregister_provider(controller, *provider); uuid_clear(*provider); goto failed; } failed: if (nexus_attr != NULL) { kern_nexus_attr_destroy(nexus_attr); } return err; } static errno_t headless_attach_netif_nexus(if_headless_ref headlessif, struct ifnet_init_eparams * init_params, ifnet_t *ifp) { headless_packet_pool_t fpp; headless_nx_t nx = &headlessif->iff_nx; boolean_t multi_buflet; multi_buflet = headless_using_multibuflets(headlessif); fpp = headless_packet_pool_alloc(multi_buflet, headlessif->iff_max_mtu); if (fpp == NULL) { return ENOMEM; } headlessif->iff_fpp = fpp; return create_netif_provider_and_instance(headlessif, init_params, ifp, &nx->fnx_provider, &nx->fnx_instance); } static void detach_provider_and_instance(uuid_t provider, uuid_t instance) { nexus_controller_t controller = kern_nexus_shared_controller(); errno_t err; if (!uuid_is_null(instance)) { err = kern_nexus_controller_free_provider_instance(controller, instance); if (err != 0) { printf("%s free_provider_instance failed %d\n", __func__, err); } uuid_clear(instance); } if (!uuid_is_null(provider)) { err = kern_nexus_controller_deregister_provider(controller, provider); if (err != 0) { printf("%s deregister_provider %d\n", __func__, err); } uuid_clear(provider); } return; } static void headless_detach_netif_nexus(headless_nx_t nx) { detach_provider_and_instance(nx->fnx_provider, nx->fnx_instance); } /** ** headless interface routines **/ static void headless_ifnet_set_attrs(if_headless_ref headlessif, ifnet_t ifp) { (void)ifnet_set_capabilities_enabled(ifp, 0, -1); ifnet_set_addrlen(ifp, ETHER_ADDR_LEN); ifnet_set_baudrate(ifp, 0); ifnet_set_mtu(ifp, ETHERMTU); ifnet_set_flags(ifp, IFF_BROADCAST | IFF_MULTICAST | IFF_SIMPLEX, 0xffff); ifnet_set_hdrlen(ifp, sizeof(struct ether_header)); if ((headlessif->iff_flags & IFF_FLAGS_HWCSUM) != 0) { ifnet_set_offload(ifp, IFNET_CSUM_IP | IFNET_CSUM_TCP | IFNET_CSUM_UDP | IFNET_CSUM_TCPIPV6 | IFNET_CSUM_UDPIPV6); } else { ifnet_set_offload(ifp, 0); } } static void interface_link_event(ifnet_t ifp, u_int32_t event_code) { struct event { u_int32_t ifnet_family; u_int32_t unit; char if_name[IFNAMSIZ]; }; _Alignas(struct kern_event_msg) char message[sizeof(struct kern_event_msg) + sizeof(struct event)] = { 0 }; struct kern_event_msg *header = (struct kern_event_msg*)message; struct event *data = (struct event *)(message + KEV_MSG_HEADER_SIZE); header->total_size = sizeof(message); header->vendor_code = KEV_VENDOR_APPLE; header->kev_class = KEV_NETWORK_CLASS; header->kev_subclass = KEV_DL_SUBCLASS; header->event_code = event_code; data->ifnet_family = ifnet_family(ifp); data->unit = (u_int32_t)ifnet_unit(ifp); strlcpy(data->if_name, ifnet_name(ifp), IFNAMSIZ); ifnet_event(ifp, header); } static if_headless_ref ifnet_get_if_headless(ifnet_t ifp) { return (if_headless_ref)ifnet_softc(ifp); } static int headless_clone_create(struct if_clone *ifc, u_int32_t unit, void *params) { #pragma unused(params) int error; if_headless_ref headlessif; struct ifnet_init_eparams headless_init; ifnet_ref_t ifp; uint8_t mac_address[ETHER_ADDR_LEN]; headlessif = kalloc_type(struct if_headless, Z_WAITOK_ZERO_NOFAIL); headlessif->iff_retain_count = 1; if (strbufcmp(ifc->ifc_name, HEADLESS_ZERO_IFNAME) == 0) { headlessif->iff_cloner = &headless_zero_cloner; ASSERT(strlen(HEADLESS_ZERO_IFNAME) == 4); bcopy(HEADLESS_ZERO_IFNAME, mac_address, 4); } else { headlessif->iff_cloner = &headless_null_cloner; ASSERT(strlen(HEADLESS_NULL_IFNAME) == 4); bcopy(HEADLESS_NULL_IFNAME, mac_address, 4); } mac_address[ETHER_ADDR_LEN - 2] = (unit & 0xff00) >> 8; mac_address[ETHER_ADDR_LEN - 1] = unit & 0xff; headlessif->iff_max_mtu = if_headless_max_mtu; /* use the interface name as the unique id for ifp recycle */ if ((unsigned int) snprintf(headlessif->iff_name, sizeof(headlessif->iff_name), "%s%d", ifc->ifc_name, unit) >= sizeof(headlessif->iff_name)) { headless_release(headlessif); return EINVAL; } bzero(&headless_init, sizeof(headless_init)); headless_init.ver = IFNET_INIT_CURRENT_VERSION; headless_init.len = sizeof(headless_init); headless_init.flags |= IFNET_INIT_SKYWALK_NATIVE; if (if_headless_multibuflet != 0) { headlessif->iff_flags |= IFF_FLAGS_MULTIBUFLETS; } headlessif->iff_tx_headroom = if_headless_tx_headroom; headless_init.tx_headroom = headlessif->iff_tx_headroom; if (if_headless_nxattach == 0) { headless_init.flags |= IFNET_INIT_NX_NOAUTO; } headless_init.uniqueid_len = (uint32_t)strbuflen(headlessif->iff_name); headless_init.uniqueid = headlessif->iff_name; headless_init.name = __unsafe_null_terminated_from_indexable(ifc->ifc_name); headless_init.unit = unit; headless_init.family = IFNET_FAMILY_ETHERNET; headless_init.type = IFT_ETHER; headless_init.demux = ether_demux; headless_init.add_proto = ether_add_proto; headless_init.del_proto = ether_del_proto; headless_init.check_multi = ether_check_multi; headless_init.framer_extended = ether_frameout_extended; headless_init.softc = headlessif; headless_init.ioctl = headless_ioctl; headless_init.set_bpf_tap = NULL; headless_init.detach = headless_if_free; headless_init.broadcast_addr = etherbroadcastaddr; headless_init.broadcast_len = ETHER_ADDR_LEN; error = headless_attach_netif_nexus(headlessif, &headless_init, &ifp); if (error != 0) { headless_release(headlessif); return error; } /* take an additional reference to ensure that it doesn't go away */ headless_retain(headlessif); headlessif->iff_ifp = ifp; headlessif->iff_media_count = default_media_words_count; bcopy(default_media_words, headlessif->iff_media_list, sizeof(default_media_words)); ifnet_set_lladdr(ifp, mac_address, sizeof(mac_address)); /* attach as ethernet */ bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header)); interface_link_event(ifp, KEV_DL_LINK_ON); return 0; } static int headless_clone_destroy(ifnet_t ifp) { if_headless_ref headlessif; headless_nx nx; boolean_t nx_attached = FALSE; interface_link_event(ifp, KEV_DL_LINK_OFF); headless_lock(); headlessif = ifnet_get_if_headless(ifp); if (headlessif == NULL || headless_is_detaching(headlessif)) { headless_unlock(); return 0; } headless_set_detaching(headlessif); nx_attached = TRUE; nx = headlessif->iff_nx; bzero(&headlessif->iff_nx, sizeof(headlessif->iff_nx)); headless_unlock(); if (nx_attached) { headless_detach_netif_nexus(&nx); headless_release(headlessif); } ifnet_detach(ifp); return 0; } static int headless_set_media(ifnet_t ifp, struct if_headless_request * iffr) { if_headless_ref headlessif; int error; if (iffr->iffr_media.iffm_count > IF_HEADLESS_MEDIA_LIST_MAX) { /* list is too long */ return EINVAL; } headless_lock(); headlessif = ifnet_get_if_headless(ifp); if (headlessif == NULL) { error = EINVAL; goto done; } headlessif->iff_media_count = iffr->iffr_media.iffm_count; bcopy(iffr->iffr_media.iffm_list, headlessif->iff_media_list, iffr->iffr_media.iffm_count * sizeof(headlessif->iff_media_list[0])); #if 0 /* XXX: "auto-negotiate" active with peer? */ /* generate link status event? */ headlessif->iff_media_current = iffr->iffr_media.iffm_current; #endif error = 0; done: headless_unlock(); return error; } static int if_headless_request_copyin(user_addr_t user_addr, struct if_headless_request *iffr, size_t len) { int error; if (user_addr == USER_ADDR_NULL || len < sizeof(*iffr)) { error = EINVAL; goto done; } error = copyin(user_addr, iffr, sizeof(*iffr)); if (error != 0) { goto done; } if (iffr->iffr_reserved[0] != 0 || iffr->iffr_reserved[1] != 0 || iffr->iffr_reserved[2] != 0 || iffr->iffr_reserved[3] != 0) { error = EINVAL; goto done; } done: return error; } static int headless_set_drvspec(ifnet_t ifp, uint64_t cmd, size_t len, user_addr_t user_addr) { int error; struct if_headless_request iffr; switch (cmd) { case IF_HEADLESS_S_CMD_SET_MEDIA: error = if_headless_request_copyin(user_addr, &iffr, len); if (error != 0) { break; } error = headless_set_media(ifp, &iffr); break; default: error = EOPNOTSUPP; break; } return error; } static int headless_get_drvspec(ifnet_t ifp, uint64_t cmd, size_t len, user_addr_t user_addr) { #pragma unused(ifp, len, user_addr) int error = EOPNOTSUPP; switch (cmd) { default: break; } return error; } union ifdrvu { struct ifdrv32 *ifdrvu_32; struct ifdrv64 *ifdrvu_64; void *ifdrvu_p; }; static int headless_ioctl(ifnet_t ifp, u_long cmd, void * data) { unsigned int count; struct ifdevmtu * devmtu_p; union ifdrvu drv; uint64_t drv_cmd; uint64_t drv_len; boolean_t drv_set_command = FALSE; int error = 0; struct ifmediareq32 * ifmr; struct ifreq * ifr; if_headless_ref headlessif; int status; user_addr_t user_addr; ifr = (struct ifreq *)data; switch (cmd) { case SIOCSIFADDR: ifnet_set_flags(ifp, IFF_UP, IFF_UP); break; case SIOCGIFMEDIA32: case SIOCGIFMEDIA64: headless_lock(); headlessif = ifnet_get_if_headless(ifp); if (headlessif == NULL) { headless_unlock(); return EOPNOTSUPP; } status = (headlessif->iff_peer != NULL) ? (IFM_AVALID | IFM_ACTIVE) : IFM_AVALID; ifmr = (struct ifmediareq32 *)data; user_addr = (cmd == SIOCGIFMEDIA64) ? CAST_USER_ADDR_T(((struct ifmediareq64 *)data)->ifmu_ulist) : CAST_USER_ADDR_T(((struct ifmediareq32 *)data)->ifmu_ulist); count = ifmr->ifm_count; ifmr->ifm_active = IFM_ETHER; ifmr->ifm_current = IFM_ETHER; ifmr->ifm_mask = 0; ifmr->ifm_status = status; if (user_addr == USER_ADDR_NULL) { ifmr->ifm_count = headlessif->iff_media_count; } else if (count > 0) { if (count > headlessif->iff_media_count) { count = headlessif->iff_media_count; } ifmr->ifm_count = count; error = copyout(&headlessif->iff_media_list, user_addr, count * sizeof(int)); } headless_unlock(); break; case SIOCGIFDEVMTU: devmtu_p = &ifr->ifr_devmtu; devmtu_p->ifdm_current = ifnet_mtu(ifp); devmtu_p->ifdm_max = headless_max_mtu(ifp); devmtu_p->ifdm_min = IF_MINMTU; break; case SIOCSIFMTU: if ((unsigned int)ifr->ifr_mtu > headless_max_mtu(ifp) || ifr->ifr_mtu < IF_MINMTU) { error = EINVAL; } else { error = ifnet_set_mtu(ifp, ifr->ifr_mtu); } break; case SIOCSDRVSPEC32: case SIOCSDRVSPEC64: error = proc_suser(current_proc()); if (error != 0) { break; } drv_set_command = TRUE; OS_FALLTHROUGH; case SIOCGDRVSPEC32: case SIOCGDRVSPEC64: drv.ifdrvu_p = data; if (cmd == SIOCGDRVSPEC32 || cmd == SIOCSDRVSPEC32) { drv_cmd = drv.ifdrvu_32->ifd_cmd; drv_len = drv.ifdrvu_32->ifd_len; user_addr = CAST_USER_ADDR_T(drv.ifdrvu_32->ifd_data); } else { drv_cmd = drv.ifdrvu_64->ifd_cmd; drv_len = drv.ifdrvu_64->ifd_len; user_addr = CAST_USER_ADDR_T(drv.ifdrvu_64->ifd_data); } if (drv_set_command) { error = headless_set_drvspec(ifp, drv_cmd, (size_t)drv_len, user_addr); } else { error = headless_get_drvspec(ifp, drv_cmd, (size_t)drv_len, user_addr); } break; case SIOCSIFLLADDR: error = ifnet_set_lladdr(ifp, ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); break; case SIOCSIFFLAGS: if ((ifp->if_flags & IFF_UP) != 0) { /* marked up, set running if not already set */ if ((ifp->if_flags & IFF_RUNNING) == 0) { /* set running */ error = ifnet_set_flags(ifp, IFF_RUNNING, IFF_RUNNING); } } else if ((ifp->if_flags & IFF_RUNNING) != 0) { /* marked down, clear running */ error = ifnet_set_flags(ifp, 0, IFF_RUNNING); } break; case SIOCADDMULTI: case SIOCDELMULTI: error = 0; break; default: error = EOPNOTSUPP; break; } return error; } static void headless_if_free(ifnet_t ifp) { if_headless_ref headlessif; if (ifp == NULL) { return; } headless_lock(); headlessif = ifnet_get_if_headless(ifp); if (headlessif == NULL) { headless_unlock(); return; } ifp->if_softc = NULL; assert(headlessif->iff_doorbell_tcall == NULL); headless_unlock(); headless_release(headlessif); ifnet_release(ifp); return; } void if_headless_init(void) { int error; (void)headless_register_nexus_domain_provider(); error = if_clone_attach(&headless_zero_cloner); if (error != 0) { return; } error = if_clone_attach(&headless_null_cloner); if (error != 0) { if_clone_detach(&headless_zero_cloner); return; } return; } #else /* !SKYWALK */ extern void if_headless_init(void); void if_headless_init(void) { /* nothing here */ } #endif /* SKYWALK */ |