sys/net/bridge/if_bridge.c
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4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524 4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 | /* * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Jason L. Wright * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * 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 $ * $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ * $FreeBSD: src/sys/net/if_bridge.c,v 1.26 2005/10/13 23:05:55 thompsa 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). * * * Bridge's route information is duplicated to each CPUs: * * CPU0 CPU1 CPU2 CPU3 * +-----------+ +-----------+ +-----------+ +-----------+ * | rtnode | | rtnode | | rtnode | | rtnode | * | | | | | | | | * | dst eaddr | | dst eaddr | | dst eaddr | | dst eaddr | * +-----------+ +-----------+ +-----------+ +-----------+ * | | | | * | | | | * | | +----------+ | | * | | | rtinfo | | | * | +---->| |<---+ | * | | flags | | * +-------------->| timeout |<-------------+ * | dst_ifp | * +----------+ * * We choose to put timeout and dst_ifp into shared part, so updating * them will be cheaper than using message forwarding. Also there is * not need to use spinlock to protect the updating: timeout and dst_ifp * is not related and specific field's updating order has no importance. * The cache pollution by the share part should not be heavy: in a stable * setup, dst_ifp probably will be not changed in rtnode's life time, * while timeout is refreshed once per second; most of the time, timeout * and dst_ifp are read-only accessed. * * * Bridge route information installation on bridge_input path: * * CPU0 CPU1 CPU2 CPU3 * * netisr2 * | * alloc nmsg * snd nmsg | * w/o rtinfo | * netisr0<-----------------------+ * | : * lookup dst : * rtnode exists?(Y)free nmsg : * |(N) : * | : * alloc rtinfo : * alloc rtnode : * install rtnode : * | : * +---------->netisr1 : * : fwd nmsg | : * : w/ rtinfo | : * : | : * : | : * alloc rtnode : * (w/ nmsg's rtinfo) : * install rtnode : * | : * +----------->| * : fwd nmsg | * : w/ rtinfo | * : | * : same as netisr1 * | * +---------->netisr3 * : fwd nmsg | * : w/ rtinfo | * : | * : same as netisr1 * free nmsg * : * : * * The netmsgs forwarded between netisr2 are allocated with * (M_WAITOK|M_NULLOK), so it will not fail under most cases (route * information is too precious to be not installed :). Since multiple * netisrs may try to install route information for the same dst eaddr, * we look up route information in netisr0. However, this looking up * only need to be performed on netisr0, which is the start point of * the route information installation process. * * * Bridge route information deleting/flushing: * * CPU0 CPU1 CPU2 CPU3 * * netisr0 * | * find suitable rtnodes, * mark their rtinfo dead * | * | domsg <-------------------------------------------+ * : delete rtnodes | replymsg * : w/ dead rtinfo | * : | * : fwdmsg fwdmsg fwdmsg | * :----------> netisr1 --------> netisr2 --------> netisr3 * delete rtnodes delete rtnodes delete rtnodes * w/ dead rtinfo w/ dead rtinfo w/ dead rtinfo * free dead rtinfos * * All deleting/flushing operations are serialized by netisr0, so each * operation only reaps the route information marked dead by itself. * * * Bridge route information adding/deleting/flushing: * Since all operation is serialized by the fixed message flow between * netisrs, it is not possible to create corrupted per-cpu route * information. * * * * XXX This no longer applies. * Percpu member interface list iteration with blocking operation: * Since one bridge could only delete one member interface at a time and * the deleted member interface is not freed after netmsg_service_sync(), * following way is used to make sure that even if the certain member * interface is ripped from the percpu list during the blocking operation, * the iteration still could keep going: * * TAILQ_FOREACH_MUTABLE(bif, sc->sc_iflists[mycpuid], bif_next, nbif) { * blocking operation; * blocking operation; * ... * ... * if (nbif != NULL && !nbif->bif_onlist) { * KKASSERT(bif->bif_onlist); * nbif = TAILQ_NEXT(bif, bif_next); * } * } * * As mentioned above only one member interface could be unlinked from the * percpu member interface list, so either bif or nbif may be not on the list, * but _not_ both. To keep the list iteration, we don't care about bif, but * only nbif. Since removed member interface will only be freed after we * finish our work, it is safe to access any field in an unlinked bif (here * bif_onlist). If nbif is no longer on the list, then bif must be on the * list, so we change nbif to the next element of bif and keep going. */ #include "opt_inet.h" #include "opt_inet6.h" #include <sys/param.h> #include <sys/mbuf.h> #include <sys/malloc.h> #include <sys/protosw.h> #include <sys/systm.h> #include <sys/time.h> #include <sys/socket.h> /* for net/if.h */ #include <sys/sockio.h> #include <sys/ctype.h> /* string functions */ #include <sys/kernel.h> #include <sys/random.h> #include <sys/sysctl.h> #include <sys/module.h> #include <sys/proc.h> #include <sys/caps.h> #include <sys/lock.h> #include <sys/thread.h> #include <sys/thread2.h> #include <sys/mpipe.h> #include <net/bpf.h> #include <net/if.h> #include <net/if_dl.h> #include <net/if_types.h> #include <net/if_var.h> #include <net/pfil.h> #include <net/ifq_var.h> #include <net/if_clone.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 #include <netinet/if_ether.h> /* for struct arpcom */ #include <net/bridge/if_bridgevar.h> #include <net/if_llc.h> #include <net/netmsg2.h> #include <net/netisr2.h> #include <net/route.h> #include <sys/in_cksum.h> /* * Size of the route hash table. Must be a power of two. */ #ifndef BRIDGE_RTHASH_SIZE #define BRIDGE_RTHASH_SIZE 1024 #endif #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) /* * Maximum number of addresses to cache. */ #ifndef BRIDGE_RTABLE_MAX #define BRIDGE_RTABLE_MAX 4096 #endif /* * Spanning tree defaults. */ #define BSTP_DEFAULT_MAX_AGE (20 * 256) #define BSTP_DEFAULT_HELLO_TIME (2 * 256) #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) #define BSTP_DEFAULT_HOLD_TIME (1 * 256) #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 #define BSTP_DEFAULT_PATH_COST 55 /* * 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 mask on the member interface. */ #define BRIDGE_IFCAPS_MASK (IFCAP_TXCSUM | IFCAP_TSO) typedef int (*bridge_ctl_t)(struct bridge_softc *, void *); struct netmsg_brctl { struct netmsg_base base; bridge_ctl_t bc_func; struct bridge_softc *bc_sc; void *bc_arg; }; struct netmsg_brsaddr { struct netmsg_base base; struct bridge_softc *br_softc; struct ifnet *br_dst_if; struct bridge_rtinfo *br_rtinfo; int br_setflags; uint8_t br_dst[ETHER_ADDR_LEN]; uint8_t br_flags; }; struct netmsg_braddbif { struct netmsg_base base; struct bridge_softc *br_softc; struct bridge_ifinfo *br_bif_info; struct ifnet *br_bif_ifp; }; struct netmsg_brdelbif { struct netmsg_base base; struct bridge_softc *br_softc; struct bridge_ifinfo *br_bif_info; struct bridge_iflist_head *br_bif_list; }; struct netmsg_brsflags { struct netmsg_base base; struct bridge_softc *br_softc; struct bridge_ifinfo *br_bif_info; uint32_t br_bif_flags; }; eventhandler_tag bridge_detach_cookie = NULL; extern struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *); extern int (*bridge_output_p)(struct ifnet *, struct mbuf *); extern void (*bridge_dn_p)(struct mbuf *, struct ifnet *); extern struct ifnet *(*bridge_interface_p)(void *if_bridge); static int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; static int bridge_clone_create(struct if_clone *, int, caddr_t, caddr_t); static int bridge_clone_destroy(struct ifnet *); static int bridge_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *); static void bridge_mutecaps(struct bridge_ifinfo *, struct ifnet *, int); static void bridge_ifdetach(void *, struct ifnet *); static void bridge_init(void *); static int bridge_from_us(struct bridge_softc *, struct ether_header *); static void bridge_stop(struct ifnet *); static void bridge_start(struct ifnet *, struct ifaltq_subque *); static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); static int bridge_output(struct ifnet *, struct mbuf *); static struct ifnet *bridge_interface(void *if_bridge); static void bridge_forward(struct bridge_softc *, struct mbuf *m); static void bridge_timer_handler(netmsg_t); static void bridge_timer(void *); static void bridge_start_bcast(struct bridge_softc *, struct mbuf *); static void bridge_broadcast(struct bridge_softc *, struct ifnet *, struct mbuf *); static void bridge_span(struct bridge_softc *, struct mbuf *); static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, struct ifnet *, uint8_t); static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); static void bridge_rtreap(struct bridge_softc *); static void bridge_rtreap_async(struct bridge_softc *); static void bridge_rttrim(struct bridge_softc *); static int bridge_rtage_finddead(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 *); static int bridge_rtsaddr(struct bridge_softc *, const uint8_t *, struct ifnet *, uint8_t); static void bridge_rtmsg_sync(struct bridge_softc *sc); static void bridge_rtreap_handler(netmsg_t); static void bridge_rtinstall_handler(netmsg_t); static int bridge_rtinstall_oncpu(struct bridge_softc *, const uint8_t *, struct ifnet *, int, uint8_t, struct bridge_rtinfo **); static void 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 *); static void bridge_rtnode_insert(struct bridge_softc *, struct bridge_rtnode *); static void bridge_rtnode_destroy(struct bridge_softc *, struct bridge_rtnode *); 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 struct bridge_iflist *bridge_lookup_member_ifinfo(struct bridge_softc *, struct bridge_ifinfo *); 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_control(struct bridge_softc *, u_long, bridge_ctl_t, void *); static int bridge_ioctl_init(struct bridge_softc *, void *); static int bridge_ioctl_stop(struct bridge_softc *, void *); static int bridge_ioctl_add(struct bridge_softc *, void *); static int bridge_ioctl_del(struct bridge_softc *, void *); static void bridge_ioctl_fillflags(struct bridge_softc *sc, struct bridge_iflist *bif, struct ifbreq *req); 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_gifs(struct bridge_softc *, void *); static int bridge_ioctl_rts(struct bridge_softc *, void *); static int bridge_ioctl_saddr(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_daddr(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_reinit(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_addspan(struct bridge_softc *, void *); static int bridge_ioctl_delspan(struct bridge_softc *, void *); static int bridge_ioctl_sifbondwght(struct bridge_softc *, void *); 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 *); static void bridge_enqueue_handler(netmsg_t); static void bridge_handoff(struct bridge_softc *, struct ifnet *, struct mbuf *, int); static void bridge_del_bif_handler(netmsg_t); static void bridge_add_bif_handler(netmsg_t); static void bridge_del_bif(struct bridge_softc *, struct bridge_ifinfo *, struct bridge_iflist_head *); static void bridge_add_bif(struct bridge_softc *, struct bridge_ifinfo *, struct ifnet *); SYSCTL_DECL(_net_link); SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 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 bridge_debug; 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, 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, debug, CTLFLAG_RW, &bridge_debug, 0, "Bridge debug mode"); struct bridge_control_arg { union { struct ifbreq ifbreq; struct ifbifconf ifbifconf; struct ifbareq ifbareq; struct ifbaconf ifbaconf; struct ifbrparam ifbrparam; } bca_u; int bca_len; void *bca_uptr; void *bca_kptr; }; struct bridge_control { bridge_ctl_t bc_func; int bc_argsize; 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 */ const struct bridge_control bridge_control_table[] = { { 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_gifs, sizeof(struct ifbifconf), BC_F_COPYIN|BC_F_COPYOUT }, { bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_COPYIN|BC_F_COPYOUT }, { bridge_ioctl_saddr, sizeof(struct ifbareq), 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_daddr, sizeof(struct ifbareq), 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_addspan, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_delspan, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_sifbondwght, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, }; static const int bridge_control_table_size = NELEM(bridge_control_table); LIST_HEAD(, bridge_softc) bridge_list; struct if_clone bridge_cloner = IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy, 0, IF_MAXUNIT); static int bridge_modevent(module_t mod, int type, void *data) { switch (type) { case MOD_LOAD: LIST_INIT(&bridge_list); if_clone_attach(&bridge_cloner); bridge_input_p = bridge_input; bridge_output_p = bridge_output; bridge_interface_p = bridge_interface; bridge_detach_cookie = EVENTHANDLER_REGISTER( ifnet_detach_event, bridge_ifdetach, NULL, EVENTHANDLER_PRI_ANY); #if 0 /* notyet */ bstp_linkstate_p = bstp_linkstate; #endif break; case MOD_UNLOAD: if (!LIST_EMPTY(&bridge_list)) return (EBUSY); EVENTHANDLER_DEREGISTER(ifnet_detach_event, bridge_detach_cookie); if_clone_detach(&bridge_cloner); bridge_input_p = NULL; bridge_output_p = NULL; bridge_interface_p = NULL; #if 0 /* notyet */ bstp_linkstate_p = NULL; #endif break; default: return (EOPNOTSUPP); } return (0); } static moduledata_t bridge_mod = { "if_bridge", bridge_modevent, 0 }; DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); /*#define BRIDGE_DEBUG_ENABLE*/ #ifdef BRIDGE_DEBUG_ENABLE static void BRIDGE_DEBUG(const char *str, struct ifnet *src_if, struct ifnet *dst_if, struct mbuf *m) { if ((bridge_debug & 2) == 0) return; if (str) kprintf("%s", str); if (src_if) kprintf(" src={%s,%s%d}", src_if->if_xname, src_if->if_dname, src_if->if_dunit); if (dst_if) kprintf(" dst={%s,%s%d}", dst_if->if_xname, dst_if->if_dname, dst_if->if_dunit); if (m) { struct ether_header *eh; struct ip *ip; eh = mtod(m, struct ether_header *); kprintf(" %02x:%02x:%02x:%02x:%02x:%02x " "%02x:%02x:%02x:%02x:%02x:%02x type %04x ", 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_shost[0], eh->ether_shost[1], eh->ether_shost[2], eh->ether_shost[3], eh->ether_shost[4], eh->ether_shost[5], eh->ether_type); ip = (void *)(eh + 1); kprintf("%u.%u.%u.%u -> %u.%u.%u.%u", (uint8_t)(ip->ip_src.s_addr >> 24), (uint8_t)(ip->ip_src.s_addr >> 16), (uint8_t)(ip->ip_src.s_addr >> 8), (uint8_t)(ip->ip_src.s_addr), (uint8_t)(ip->ip_dst.s_addr >> 24), (uint8_t)(ip->ip_dst.s_addr >> 16), (uint8_t)(ip->ip_dst.s_addr >> 8), (uint8_t)(ip->ip_dst.s_addr)); kprintf("\n"); } } #else #define BRIDGE_DEBUG(ctl, sif, dif, m) #endif /* * bridge_clone_create: * * Create a new bridge instance. */ static int bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params __unused, caddr_t data __unused) { struct bridge_softc *sc; struct ifnet *ifp; u_char eaddr[6]; int cpu, rnd; sc = kmalloc(sizeof(*sc), M_DEVBUF, M_WAITOK | M_ZERO); ifp = sc->sc_ifp = &sc->sc_if; sc->sc_brtmax = BRIDGE_RTABLE_MAX; sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; /* Initialize our routing table. */ bridge_rtable_init(sc); callout_init_mp(&sc->sc_brcallout); netmsg_init(&sc->sc_brtimemsg, NULL, &netisr_adone_rport, MSGF_DROPABLE, bridge_timer_handler); sc->sc_brtimemsg.lmsg.u.ms_resultp = sc; callout_init_mp(&sc->sc_bstpcallout); netmsg_init(&sc->sc_bstptimemsg, NULL, &netisr_adone_rport, MSGF_DROPABLE, bstp_tick_handler); sc->sc_bstptimemsg.lmsg.u.ms_resultp = sc; /* Initialize per-cpu member iface lists */ sc->sc_iflists = kmalloc(sizeof(*sc->sc_iflists) * netisr_ncpus, M_DEVBUF, M_WAITOK); for (cpu = 0; cpu < netisr_ncpus; ++cpu) TAILQ_INIT(&sc->sc_iflists[cpu]); TAILQ_INIT(&sc->sc_spanlist); ifp->if_softc = sc; if_initname(ifp, ifc->ifc_name, unit); ifp->if_mtu = ETHERMTU; ifp->if_flags = IFF_BROADCAST | IFF_MULTICAST | IFF_ISBRIDGE; ifp->if_ioctl = bridge_ioctl; ifp->if_start = bridge_start; ifp->if_init = bridge_init; ifp->if_type = IFT_ETHER; ifq_set_maxlen(&ifp->if_snd, ifqmaxlen); ifq_set_ready(&ifp->if_snd); ifp->if_hdrlen = ETHER_HDR_LEN; /* * Generate a random ethernet address and use the private AC:DE:48 * OUI code. */ rnd = karc4random(); bcopy(&rnd, &eaddr[0], 4); /* ETHER_ADDR_LEN == 6 */ rnd = karc4random(); bcopy(&rnd, &eaddr[2], 4); /* ETHER_ADDR_LEN == 6 */ eaddr[0] &= ~1; /* clear multicast bit */ eaddr[0] |= 2; /* set the LAA bit */ ether_ifattach(ifp, eaddr, NULL); /* Now undo some of the damage... */ ifp->if_baudrate = 0; /*ifp->if_type = IFT_BRIDGE;*/ crit_enter(); /* XXX MP */ LIST_INSERT_HEAD(&bridge_list, sc, sc_list); crit_exit(); return (0); } static void bridge_delete_dispatch(netmsg_t msg) { struct bridge_softc *sc = msg->lmsg.u.ms_resultp; struct ifnet *bifp = sc->sc_ifp; struct bridge_iflist *bif; ifnet_serialize_all(bifp); while ((bif = TAILQ_FIRST(&sc->sc_iflists[mycpuid])) != NULL) bridge_delete_member(sc, bif, 0); while ((bif = TAILQ_FIRST(&sc->sc_spanlist)) != NULL) bridge_delete_span(sc, bif); ifnet_deserialize_all(bifp); lwkt_replymsg(&msg->lmsg, 0); } /* * bridge_clone_destroy: * * Destroy a bridge instance. */ static int bridge_clone_destroy(struct ifnet *ifp) { struct bridge_softc *sc = ifp->if_softc; struct netmsg_base msg; ifnet_serialize_all(ifp); bridge_stop(ifp); ifp->if_flags &= ~IFF_UP; ifnet_deserialize_all(ifp); netmsg_init(&msg, NULL, &curthread->td_msgport, 0, bridge_delete_dispatch); msg.lmsg.u.ms_resultp = sc; lwkt_domsg(BRIDGE_CFGPORT, &msg.lmsg, 0); crit_enter(); /* XXX MP */ LIST_REMOVE(sc, sc_list); crit_exit(); ether_ifdetach(ifp); /* Tear down the routing table. */ bridge_rtable_fini(sc); /* Free per-cpu member iface lists */ kfree(sc->sc_iflists, M_DEVBUF); kfree(sc, M_DEVBUF); return 0; } /* * bridge_ioctl: * * Handle a control request from the operator. */ static int bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr) { struct bridge_softc *sc = ifp->if_softc; struct bridge_control_arg args; struct ifdrv *ifd = (struct ifdrv *) data; const struct bridge_control *bc; int error = 0; ASSERT_IFNET_SERIALIZED_ALL(ifp); switch (cmd) { case SIOCADDMULTI: case SIOCDELMULTI: break; case SIOCGDRVSPEC: case SIOCSDRVSPEC: 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)) { error = EINVAL; break; } if (bc->bc_flags & BC_F_SUSER) { error = caps_priv_check(cr, SYSCAP_RESTRICTEDROOT | __SYSCAP_NULLCRED); if (error) break; } if (ifd->ifd_len != bc->bc_argsize || ifd->ifd_len > sizeof(args.bca_u)) { error = EINVAL; break; } memset(&args, 0, sizeof(args)); if (bc->bc_flags & BC_F_COPYIN) { error = copyin(ifd->ifd_data, &args.bca_u, ifd->ifd_len); if (error) break; } error = bridge_control(sc, cmd, bc->bc_func, &args); if (error) { KKASSERT(args.bca_len == 0 && args.bca_kptr == NULL); break; } if (bc->bc_flags & BC_F_COPYOUT) { error = copyout(&args, ifd->ifd_data, ifd->ifd_len); if (args.bca_len != 0) { KKASSERT(args.bca_kptr != NULL); if (!error) { error = copyout(args.bca_kptr, args.bca_uptr, args.bca_len); } kfree(args.bca_kptr, M_TEMP); } else { KKASSERT(args.bca_kptr == NULL); } } else { KKASSERT(args.bca_len == 0 && args.bca_kptr == NULL); } 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 it. */ bridge_stop(ifp); } else if ((ifp->if_flags & IFF_UP) && !(ifp->if_flags & IFF_RUNNING)) { /* * If interface is marked up and it is stopped, then * start it. */ ifp->if_init(sc); } /* * If running and link flag state change we have to * reinitialize as well. */ if ((ifp->if_flags & IFF_RUNNING) && (ifp->if_flags & (IFF_LINK0|IFF_LINK1|IFF_LINK2)) != sc->sc_copy_flags) { sc->sc_copy_flags = ifp->if_flags & (IFF_LINK0|IFF_LINK1|IFF_LINK2); bridge_control(sc, 0, bridge_ioctl_reinit, NULL); } break; case SIOCSIFMTU: /* Do not allow the MTU to be changed on the bridge */ error = EINVAL; break; default: error = ether_ioctl(ifp, cmd, data); break; } return (error); } /* * bridge_mutecaps: * * Clear or restore unwanted capabilities on the member interface */ static void bridge_mutecaps(struct bridge_ifinfo *bif_info, struct ifnet *ifp, int mute) { struct ifreq ifr; if (ifp->if_ioctl == NULL) return; bzero(&ifr, sizeof(ifr)); ifr.ifr_reqcap = ifp->if_capenable; if (mute) { /* mask off and save capabilities */ bif_info->bifi_mutecap = ifr.ifr_reqcap & BRIDGE_IFCAPS_MASK; if (bif_info->bifi_mutecap != 0) ifr.ifr_reqcap &= ~BRIDGE_IFCAPS_MASK; } else { /* restore muted capabilities */ ifr.ifr_reqcap |= bif_info->bifi_mutecap; } if (bif_info->bifi_mutecap != 0) { ifnet_serialize_all(ifp); ifp->if_ioctl(ifp, SIOCSIFCAP, (caddr_t)&ifr, NULL); ifnet_deserialize_all(ifp); } } /* * 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; TAILQ_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) { if (strcmp(bif->bif_ifp->if_xname, name) == 0) return (bif); } return (NULL); } /* * bridge_lookup_member_if: * * Lookup a bridge member interface by ifnet*. */ static struct bridge_iflist * bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) { struct bridge_iflist *bif; TAILQ_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) { if (bif->bif_ifp == member_ifp) return (bif); } return (NULL); } /* * bridge_lookup_member_ifinfo: * * Lookup a bridge member interface by bridge_ifinfo. */ static struct bridge_iflist * bridge_lookup_member_ifinfo(struct bridge_softc *sc, struct bridge_ifinfo *bif_info) { struct bridge_iflist *bif; TAILQ_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) { if (bif->bif_info == bif_info) return (bif); } return (NULL); } /* * 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; struct ifnet *bifp = sc->sc_ifp; struct bridge_ifinfo *bif_info = bif->bif_info; struct bridge_iflist_head saved_bifs; ASSERT_IFNET_SERIALIZED_ALL(bifp); KKASSERT(bif_info != NULL); ifs->if_bridge = NULL; /* * Release bridge interface's serializer: * - To avoid possible dead lock. * - Various sync operation will block the current thread. */ ifnet_deserialize_all(bifp); if (!gone) { switch (ifs->if_type) { case IFT_ETHER: case IFT_L2VLAN: /* * Take the interface out of promiscuous mode. */ ifpromisc(ifs, 0); bridge_mutecaps(bif_info, ifs, 0); break; case IFT_GIF: break; default: panic("bridge_delete_member: impossible"); break; } } /* * Remove bifs from percpu linked list. * * Removed bifs are not freed immediately, instead, * they are saved in saved_bifs. They will be freed * after we make sure that no one is accessing them, * i.e. after following netmsg_service_sync() */ TAILQ_INIT(&saved_bifs); bridge_del_bif(sc, bif_info, &saved_bifs); /* * Make sure that all protocol threads: * o see 'ifs' if_bridge is changed * o know that bif is removed from the percpu linked list */ netmsg_service_sync(); /* * Free the removed bifs */ KKASSERT(!TAILQ_EMPTY(&saved_bifs)); while ((bif = TAILQ_FIRST(&saved_bifs)) != NULL) { TAILQ_REMOVE(&saved_bifs, bif, bif_next); kfree(bif, M_DEVBUF); } /* See the comment in bridge_ioctl_stop() */ bridge_rtmsg_sync(sc); bridge_rtdelete(sc, ifs, IFBF_FLUSHALL | IFBF_FLUSHSYNC); ifnet_serialize_all(bifp); if (bifp->if_flags & IFF_RUNNING) bstp_initialization(sc); /* * Free the bif_info after bstp_initialization(), so that * bridge_softc.sc_root_port will not reference a dangling * pointer. */ kfree(bif_info, M_DEVBUF); } /* * bridge_delete_span: * * Delete the specified span interface. */ static void bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) { KASSERT(bif->bif_ifp->if_bridge == NULL, ("%s: not a span interface", __func__)); TAILQ_REMOVE(&sc->sc_iflists[mycpuid], bif, bif_next); kfree(bif, M_DEVBUF); } static int bridge_ioctl_init(struct bridge_softc *sc, void *arg __unused) { struct ifnet *ifp = sc->sc_ifp; if (ifp->if_flags & IFF_RUNNING) return 0; callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, bridge_timer, sc); ifp->if_flags |= IFF_RUNNING; bstp_initialization(sc); return 0; } static int bridge_ioctl_stop(struct bridge_softc *sc, void *arg __unused) { struct ifnet *ifp = sc->sc_ifp; if ((ifp->if_flags & IFF_RUNNING) == 0) return 0; callout_stop(&sc->sc_brcallout); crit_enter(); lwkt_dropmsg(&sc->sc_brtimemsg.lmsg); crit_exit(); bstp_stop(sc); ifp->if_flags &= ~IFF_RUNNING; ifnet_deserialize_all(ifp); /* Let everyone know that we are stopped */ netmsg_service_sync(); /* * Sync ifnetX msgports in the order we forward rtnode * installation message. This is used to make sure that * all rtnode installation messages sent by bridge_rtupdate() * during above netmsg_service_sync() are flushed. */ bridge_rtmsg_sync(sc); bridge_rtflush(sc, IFBF_FLUSHDYN | IFBF_FLUSHSYNC); ifnet_serialize_all(ifp); return 0; } static int bridge_ioctl_add(struct bridge_softc *sc, void *arg) { struct ifbreq *req = arg; struct bridge_iflist *bif; struct bridge_ifinfo *bif_info; struct ifnet *ifs, *bifp; int error = 0; bifp = sc->sc_ifp; ASSERT_IFNET_SERIALIZED_ALL(bifp); ifs = ifunit_netisr(req->ifbr_ifsname); if (ifs == NULL) return (ENOENT); /* 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_iflists[mycpuid])) { bifp->if_mtu = ifs->if_mtu; } else if (bifp->if_mtu != ifs->if_mtu) { if_printf(bifp, "invalid MTU for %s\n", ifs->if_xname); return (EINVAL); } } if (ifs->if_bridge == sc) return (EEXIST); if (ifs->if_bridge != NULL) return (EBUSY); bif_info = kmalloc(sizeof(*bif_info), M_DEVBUF, M_WAITOK | M_ZERO); bif_info->bifi_priority = BSTP_DEFAULT_PORT_PRIORITY; bif_info->bifi_path_cost = BSTP_DEFAULT_PATH_COST; bif_info->bifi_ifp = ifs; bif_info->bifi_bond_weight = 1; /* * Release bridge interface's serializer: * - To avoid possible dead lock. * - Various sync operation will block the current thread. */ ifnet_deserialize_all(bifp); switch (ifs->if_type) { case IFT_ETHER: case IFT_L2VLAN: /* * Place the interface into promiscuous mode. */ error = ifpromisc(ifs, 1); if (error) { ifnet_serialize_all(bifp); goto out; } bridge_mutecaps(bif_info, ifs, 1); break; case IFT_GIF: /* :^) */ break; default: error = EINVAL; ifnet_serialize_all(bifp); goto out; } /* * Add bifs to percpu linked lists */ bridge_add_bif(sc, bif_info, ifs); ifnet_serialize_all(bifp); if (bifp->if_flags & IFF_RUNNING) bstp_initialization(sc); else bstp_stop(sc); /* * Everything has been setup, so let the member interface * deliver packets to this bridge on its input/output path. */ ifs->if_bridge = sc; out: if (error) { if (bif_info != NULL) kfree(bif_info, M_DEVBUF); } 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_gifflags(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_ioctl_fillflags(sc, bif, req); return (0); } static void bridge_ioctl_fillflags(struct bridge_softc *sc, struct bridge_iflist *bif, struct ifbreq *req) { req->ifbr_ifsflags = bif->bif_flags; req->ifbr_state = bif->bif_state; req->ifbr_priority = bif->bif_priority; req->ifbr_path_cost = bif->bif_path_cost; req->ifbr_bond_weight = bif->bif_bond_weight; req->ifbr_portno = bif->bif_ifp->if_index & 0xff; if (bif->bif_flags & IFBIF_STP) { req->ifbr_peer_root = bif->bif_peer_root; req->ifbr_peer_bridge = bif->bif_peer_bridge; req->ifbr_peer_cost = bif->bif_peer_cost; req->ifbr_peer_port = bif->bif_peer_port; if (bstp_supersedes_port_info(sc, bif)) { req->ifbr_designated_root = bif->bif_peer_root; req->ifbr_designated_bridge = bif->bif_peer_bridge; req->ifbr_designated_cost = bif->bif_peer_cost; req->ifbr_designated_port = bif->bif_peer_port; } else { req->ifbr_designated_root = sc->sc_bridge_id; req->ifbr_designated_bridge = sc->sc_bridge_id; req->ifbr_designated_cost = bif->bif_path_cost + bif->bif_peer_cost; req->ifbr_designated_port = bif->bif_port_id; } } else { req->ifbr_peer_root = 0; req->ifbr_peer_bridge = 0; req->ifbr_peer_cost = 0; req->ifbr_peer_port = 0; req->ifbr_designated_root = 0; req->ifbr_designated_bridge = 0; req->ifbr_designated_cost = 0; req->ifbr_designated_port = 0; } } static int bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) { struct ifbreq *req = arg; struct bridge_iflist *bif; struct ifnet *bifp = sc->sc_ifp; bif = bridge_lookup_member(sc, req->ifbr_ifsname); if (bif == NULL) return (ENOENT); if (req->ifbr_ifsflags & IFBIF_SPAN) { /* SPAN is readonly */ return (EINVAL); } if (req->ifbr_ifsflags & IFBIF_STP) { switch (bif->bif_ifp->if_type) { case IFT_ETHER: /* These can do spanning tree. */ break; default: /* Nothing else can. */ return (EINVAL); } } bif->bif_flags = (bif->bif_flags & IFBIF_KEEPMASK) | (req->ifbr_ifsflags & ~IFBIF_KEEPMASK); if (bifp->if_flags & IFF_RUNNING) bstp_initialization(sc); return (0); } static int bridge_ioctl_scache(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; struct ifnet *ifp = sc->sc_ifp; sc->sc_brtmax = param->ifbrp_csize; ifnet_deserialize_all(ifp); bridge_rttrim(sc); ifnet_serialize_all(ifp); 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); } static int bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) { struct bridge_control_arg *bc_arg = arg; struct ifbifconf *bifc = arg; struct bridge_iflist *bif; struct ifbreq *breq; int count, len; count = 0; TAILQ_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) count++; TAILQ_FOREACH(bif, &sc->sc_spanlist, bif_next) count++; if (bifc->ifbic_len == 0) { bifc->ifbic_len = sizeof(*breq) * count; return 0; } else if (count == 0 || bifc->ifbic_len < sizeof(*breq)) { bifc->ifbic_len = 0; return 0; } len = min(bifc->ifbic_len, sizeof(*breq) * count); KKASSERT(len >= sizeof(*breq)); breq = kmalloc(len, M_TEMP, M_WAITOK | M_NULLOK | M_ZERO); if (breq == NULL) { bifc->ifbic_len = 0; return ENOMEM; } bc_arg->bca_kptr = breq; count = 0; TAILQ_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) { if (len < sizeof(*breq)) break; strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname, sizeof(breq->ifbr_ifsname)); bridge_ioctl_fillflags(sc, bif, breq); breq++; count++; len -= sizeof(*breq); } TAILQ_FOREACH(bif, &sc->sc_spanlist, bif_next) { if (len < sizeof(*breq)) break; strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname, sizeof(breq->ifbr_ifsname)); breq->ifbr_ifsflags = bif->bif_flags; breq->ifbr_portno = bif->bif_ifp->if_index & 0xff; breq++; count++; len -= sizeof(*breq); } bifc->ifbic_len = sizeof(*breq) * count; KKASSERT(bifc->ifbic_len > 0); bc_arg->bca_len = bifc->ifbic_len; bc_arg->bca_uptr = bifc->ifbic_req; return 0; } static int bridge_ioctl_rts(struct bridge_softc *sc, void *arg) { struct bridge_control_arg *bc_arg = arg; struct ifbaconf *bac = arg; struct bridge_rtnode *brt; struct ifbareq *bareq; int count, len; count = 0; LIST_FOREACH(brt, &sc->sc_rtlists[mycpuid], brt_list) count++; if (bac->ifbac_len == 0) { bac->ifbac_len = sizeof(*bareq) * count; return 0; } else if (count == 0 || bac->ifbac_len < sizeof(*bareq)) { bac->ifbac_len = 0; return 0; } len = min(bac->ifbac_len, sizeof(*bareq) * count); KKASSERT(len >= sizeof(*bareq)); bareq = kmalloc(len, M_TEMP, M_WAITOK | M_NULLOK | M_ZERO); if (bareq == NULL) { bac->ifbac_len = 0; return ENOMEM; } bc_arg->bca_kptr = bareq; count = 0; LIST_FOREACH(brt, &sc->sc_rtlists[mycpuid], brt_list) { struct bridge_rtinfo *bri = brt->brt_info; time_t expire; if (len < sizeof(*bareq)) break; strlcpy(bareq->ifba_ifsname, bri->bri_ifp->if_xname, sizeof(bareq->ifba_ifsname)); memcpy(bareq->ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); expire = bri->bri_expire; if ((bri->bri_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && time_uptime < expire) bareq->ifba_expire = expire - time_uptime; else bareq->ifba_expire = 0; bareq->ifba_flags = bri->bri_flags; bareq++; count++; len -= sizeof(*bareq); } bac->ifbac_len = sizeof(*bareq) * count; KKASSERT(bac->ifbac_len > 0); bc_arg->bca_len = bac->ifbac_len; bc_arg->bca_uptr = bac->ifbac_req; return 0; } static int bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) { struct ifbareq *req = arg; struct bridge_iflist *bif; struct ifnet *ifp = sc->sc_ifp; int error; ASSERT_IFNET_SERIALIZED_ALL(ifp); bif = bridge_lookup_member(sc, req->ifba_ifsname); if (bif == NULL) return (ENOENT); ifnet_deserialize_all(ifp); error = bridge_rtsaddr(sc, req->ifba_dst, bif->bif_ifp, req->ifba_flags); ifnet_serialize_all(ifp); 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_daddr(struct bridge_softc *sc, void *arg) { struct ifbareq *req = arg; struct ifnet *ifp = sc->sc_ifp; int error; ifnet_deserialize_all(ifp); error = bridge_rtdaddr(sc, req->ifba_dst); ifnet_serialize_all(ifp); return error; } static int bridge_ioctl_flush(struct bridge_softc *sc, void *arg) { struct ifbreq *req = arg; struct ifnet *ifp = sc->sc_ifp; ifnet_deserialize_all(ifp); bridge_rtflush(sc, req->ifbr_ifsflags | IFBF_FLUSHSYNC); ifnet_serialize_all(ifp); return (0); } static int bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; param->ifbrp_prio = sc->sc_bridge_priority; return (0); } static int bridge_ioctl_spri(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; sc->sc_bridge_priority = param->ifbrp_prio; if (sc->sc_ifp->if_flags & IFF_RUNNING) bstp_initialization(sc); return (0); } static int bridge_ioctl_reinit(struct bridge_softc *sc, void *arg __unused) { if (sc->sc_ifp->if_flags & IFF_RUNNING) bstp_initialization(sc); return (0); } static int bridge_ioctl_ght(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; return (0); } static int bridge_ioctl_sht(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; if (param->ifbrp_hellotime == 0) return (EINVAL); sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; if (sc->sc_ifp->if_flags & IFF_RUNNING) bstp_initialization(sc); return (0); } static int bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; return (0); } static int bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; if (param->ifbrp_fwddelay == 0) return (EINVAL); sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; if (sc->sc_ifp->if_flags & IFF_RUNNING) bstp_initialization(sc); return (0); } static int bridge_ioctl_gma(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; return (0); } static int bridge_ioctl_sma(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; if (param->ifbrp_maxage == 0) return (EINVAL); sc->sc_bridge_max_age = param->ifbrp_maxage << 8; if (sc->sc_ifp->if_flags & IFF_RUNNING) bstp_initialization(sc); return (0); } 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); bif->bif_priority = req->ifbr_priority; if (sc->sc_ifp->if_flags & IFF_RUNNING) bstp_initialization(sc); return (0); } 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); bif->bif_path_cost = req->ifbr_path_cost; if (sc->sc_ifp->if_flags & IFF_RUNNING) bstp_initialization(sc); return (0); } static int bridge_ioctl_sifbondwght(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_bond_weight = req->ifbr_bond_weight; /* no reinit needed */ return (0); } static int bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) { struct ifbreq *req = arg; struct bridge_iflist *bif; struct ifnet *ifs; struct bridge_ifinfo *bif_info; ifs = ifunit_netisr(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_info is needed for bif_flags */ bif_info = kmalloc(sizeof(*bif_info), M_DEVBUF, M_WAITOK | M_ZERO); bif_info->bifi_ifp = ifs; bif = kmalloc(sizeof(*bif), M_DEVBUF, M_WAITOK | M_ZERO); bif->bif_ifp = ifs; bif->bif_info = bif_info; bif->bif_flags = IFBIF_SPAN; /* NOTE: span bif does not need bridge_ifinfo */ TAILQ_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); sc->sc_span = 1; 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_netisr(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); if (TAILQ_EMPTY(&sc->sc_spanlist)) sc->sc_span = 0; return (0); } static void bridge_ifdetach_dispatch(netmsg_t msg) { struct ifnet *ifp, *bifp; struct bridge_softc *sc; struct bridge_iflist *bif; ifp = msg->lmsg.u.ms_resultp; sc = ifp->if_bridge; /* Check if the interface is a bridge member */ if (sc != NULL) { bifp = sc->sc_ifp; ifnet_serialize_all(bifp); bif = bridge_lookup_member_if(sc, ifp); if (bif != NULL) { bridge_delete_member(sc, bif, 1); } else { /* XXX Why bif will be NULL? */ } ifnet_deserialize_all(bifp); goto reply; } crit_enter(); /* XXX MP */ /* Check if the interface is a span port */ LIST_FOREACH(sc, &bridge_list, sc_list) { bifp = sc->sc_ifp; ifnet_serialize_all(bifp); TAILQ_FOREACH(bif, &sc->sc_spanlist, bif_next) if (ifp == bif->bif_ifp) { bridge_delete_span(sc, bif); break; } ifnet_deserialize_all(bifp); } crit_exit(); reply: lwkt_replymsg(&msg->lmsg, 0); } /* * bridge_ifdetach: * * Detach an interface from a bridge. Called when a member * interface is detaching. */ static void bridge_ifdetach(void *arg __unused, struct ifnet *ifp) { struct netmsg_base msg; netmsg_init(&msg, NULL, &curthread->td_msgport, 0, bridge_ifdetach_dispatch); msg.lmsg.u.ms_resultp = ifp; lwkt_domsg(BRIDGE_CFGPORT, &msg.lmsg, 0); } /* * bridge_init: * * Initialize a bridge interface. */ static void bridge_init(void *xsc) { bridge_control(xsc, SIOCSIFFLAGS, bridge_ioctl_init, NULL); } /* * bridge_stop: * * Stop the bridge interface. */ static void bridge_stop(struct ifnet *ifp) { bridge_control(ifp->if_softc, SIOCSIFFLAGS, bridge_ioctl_stop, NULL); } /* * Returns TRUE if the packet is being sent 'from us'... from our bridge * interface or from any member of our bridge interface. This is used * later on to force the MAC to be the MAC of our bridge interface. */ static int bridge_from_us(struct bridge_softc *sc, struct ether_header *eh) { struct bridge_iflist *bif; if (memcmp(eh->ether_shost, IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN) == 0) return (1); TAILQ_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) { if (memcmp(eh->ether_shost, IF_LLADDR(bif->bif_ifp), ETHER_ADDR_LEN) == 0) { return (1); } } return (0); } /* * bridge_enqueue: * * Enqueue a packet on a bridge member interface. * */ void bridge_enqueue(struct ifnet *dst_ifp, struct mbuf *m) { struct netmsg_packet *nmp; mbuftrackid(m, 64); nmp = &m->m_hdr.mh_netmsg; netmsg_init(&nmp->base, NULL, &netisr_apanic_rport, 0, bridge_enqueue_handler); nmp->nm_packet = m; nmp->base.lmsg.u.ms_resultp = dst_ifp; lwkt_sendmsg_oncpu(netisr_cpuport(mycpuid), &nmp->base.lmsg); } /* * After looking up dst_if in our forwarding table we still have to * deal with channel bonding. Find the best interface in the bonding set. */ static struct ifnet * bridge_select_unicast(struct bridge_softc *sc, struct ifnet *dst_if, int from_blocking, struct mbuf *m) { struct bridge_iflist *bif, *alt_bif, *nbif; int alt_priority, alt_count; uint8_t alt_state; /* * Unicast, kinda replicates the output side of bridge_output(). * * Even though this is a uni-cast packet we may have to select * an interface from a bonding set. */ bif = bridge_lookup_member_if(sc, dst_if); if (bif == NULL) { /* Not a member of the bridge (anymore?) */ return NULL; } /* * Send directly if the interface is not part of the spanning * tree. */ if ((bif->bif_flags & IFBIF_STP) == 0) { goto sendunicast; } /* * If STP is enabled on the target we are an equal opportunity * employer and do not necessarily output to dst_if. Instead * scan available links with the same MAC as the current dst_if * and choose the best one. * * We also need to do this because arp or other cached entries might * be tagged to the wrong port after a fail-over. We don't want to * route packets to dead ports when perfectly good ones exist. * * If LINK2 is set on the bridge, any interfaces in the same bonding * set as dst_if with the same priority will be round-robined. If * different priorities, only the highest priority is chosen. In * this case links in a STP FORWARDING or BONDED state are allowed * for unicast packets. */ alt_state = BSTP_IFSTATE_LEARNING; alt_bif = NULL; alt_priority = 0; alt_count = 0; TAILQ_FOREACH_MUTABLE(bif, &sc->sc_iflists[mycpuid], bif_next, nbif) { /* * Ignore interfaces not in the same bonding set as dst_if * or which are not running. */ if (memcmp(IF_LLADDR(bif->bif_ifp), IF_LLADDR(dst_if), ETHER_ADDR_LEN) != 0) { continue; } if ((bif->bif_ifp->if_flags & IFF_RUNNING) == 0) continue; /* * NOTE: We allow tranmissions through a BLOCKING * or LEARNING interface only as a last resort. * We DISALLOW both cases if the receiving * * NOTE: If we send a packet through a learning * interface the receiving end (if also in * LEARNING) will throw it away, so this is * the ultimate last resort. */ switch(bif->bif_state) { case BSTP_IFSTATE_LEARNING: if (from_blocking == 0 && alt_state == BSTP_IFSTATE_LEARNING && bif->bif_priority > alt_priority) { alt_priority = bif->bif_priority; alt_bif = bif; } break; case BSTP_IFSTATE_BLOCKING: if (from_blocking == 0 && (alt_state == BSTP_IFSTATE_LEARNING || (alt_state == BSTP_IFSTATE_BLOCKING && bif->bif_priority > alt_priority))) { alt_state = BSTP_IFSTATE_BLOCKING; alt_priority = bif->bif_priority; alt_bif = bif; } break; case BSTP_IFSTATE_L1BLOCKING: case BSTP_IFSTATE_LISTENING: case BSTP_IFSTATE_DISABLED: break; default: /* * Select the best interface in the FORWARDING * set (or BONDING, but there shouldn't be any * when LINK2 is not set). */ if (alt_state != BSTP_IFSTATE_BONDED || bif->bif_priority > alt_priority) { alt_state = BSTP_IFSTATE_BONDED; alt_priority = bif->bif_priority; alt_bif = bif; alt_count = 0; } else if (alt_state == BSTP_IFSTATE_BONDED && bif->bif_priority == alt_priority) { /* * Round-robin */ ++alt_count; } break; } } /* * If bonding is enabled (LINK2) and there were multiple interfaces * at the selected priority level, count packets and switch the * output interface. * * XXX need to use the toepliz hash or something like that instead * of a dumb packet round-robin. */ if (alt_count && (sc->sc_ifp->if_flags & IFF_LINK2)) { if (++alt_bif->bif_bond_count >= alt_bif->bif_bond_weight) { alt_bif->bif_bond_count = 0; TAILQ_REMOVE(&sc->sc_iflists[mycpuid], alt_bif, bif_next); TAILQ_INSERT_TAIL( &sc->sc_iflists[mycpuid], alt_bif, bif_next); } } /* * After loop, alt_if is the interface we selected. alt_if can * be NULL. */ if (alt_bif) dst_if = alt_bif->bif_ifp; sendunicast: /* * At this point, we're dealing with a unicast frame * going to a different interface. */ if ((dst_if->if_flags & IFF_RUNNING) == 0) dst_if = NULL; return (dst_if); } /* * bridge_output * * Issue locally originated (not forwarded) packet to the bridge. ifp * is the nominal interface the system route table is trying to send * it to, but we get here because that interface is part of the bridge * so really the packet is being sent to the whole bridge. * * 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) { struct bridge_softc *sc = ifp->if_bridge; struct bridge_iflist *bif, *nbif; struct ether_header *eh; struct ifnet *dst_if, *alt_if, *bifp; int from_us; int alt_priority; uint8_t alt_state; struct mbuf *mc; int used; int found; ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp); ASSERT_NETISR_NCPUS(mycpuid); mbuftrackid(m, 65); /* * Make sure that we are still a member of a bridge interface. */ if (sc == NULL) { m_freem(m); return (0); } bifp = sc->sc_ifp; /* * Acquire header */ if (m->m_len < ETHER_HDR_LEN) { m = m_pullup(m, ETHER_HDR_LEN); if (m == NULL) { IFNET_STAT_INC(bifp, oerrors, 1); return (0); } } eh = mtod(m, struct ether_header *); from_us = bridge_from_us(sc, eh); /* * 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 ((bifp->if_flags & IFF_RUNNING) == 0) { dst_if = ifp; goto sendunicast; } /* * If the packet is a broadcast or multicast, or we don't know a better * way to get there, send to all interfaces except the originating one. */ if (ETHER_IS_MULTICAST(eh->ether_dhost)) dst_if = NULL; else dst_if = bridge_rtlookup(sc, eh->ether_dhost); if (dst_if) goto sendunicast; used = 0; found = 0; if (sc->sc_span) bridge_span(sc, m); alt_if = NULL; alt_priority = 0; alt_state = BSTP_IFSTATE_LEARNING; TAILQ_FOREACH_MUTABLE(bif, &sc->sc_iflists[mycpuid], bif_next, nbif) { dst_if = bif->bif_ifp; /* * Ignore interfaces marked down * * NOTE: Since the packet is originated on the machine, the * original interface the system tried to send it to * (ifp), which is part of the bridge, is not treated * specially verses other interfaces on the bridge. */ if ((dst_if->if_flags & IFF_RUNNING) == 0) continue; /* * Issue to all FORWARDING STP-enabled interfaces and * to all non-STP interfaces. Keep track of a possible * backup to a BONDED, BLOCKING, or LEARNING interfaces * (in that priority) in case no other interfaces are found. */ if (bif->bif_flags & IFBIF_STP) { switch (bif->bif_state) { case BSTP_IFSTATE_BONDED: if (alt_state != BSTP_IFSTATE_BONDED || bif->bif_priority > alt_priority) { alt_state = BSTP_IFSTATE_BONDED; alt_priority = bif->bif_priority; alt_if = bif->bif_ifp; } continue; case BSTP_IFSTATE_BLOCKING: if (alt_state == BSTP_IFSTATE_LEARNING || (alt_state == BSTP_IFSTATE_BLOCKING && bif->bif_priority > alt_priority)) { alt_state = BSTP_IFSTATE_BLOCKING; alt_priority = bif->bif_priority; alt_if = bif->bif_ifp; } continue; case BSTP_IFSTATE_LEARNING: if (alt_state == BSTP_IFSTATE_LEARNING && bif->bif_priority > alt_priority) { alt_priority = bif->bif_priority; alt_if = bif->bif_ifp; } continue; case BSTP_IFSTATE_L1BLOCKING: case BSTP_IFSTATE_LISTENING: case BSTP_IFSTATE_DISABLED: /* * Ignore interfaces in these states */ continue; default: /* FORWARDING */ break; } } /* * Copy the packet to dstif */ KKASSERT(used == 0); if (TAILQ_NEXT(bif, bif_next) == NULL) { used = 1; mc = m; } else { mc = m_copypacket(m, M_NOWAIT); if (mc == NULL) { IFNET_STAT_INC(bifp, oerrors, 1); continue; } } /* * If the packet is 'from' us override ether_shost. */ bridge_handoff(sc, dst_if, mc, from_us); found = 1; if (nbif != NULL && !nbif->bif_onlist) { KKASSERT(bif->bif_onlist); nbif = TAILQ_NEXT(bif, bif_next); } } /* * If we couldn't find anything use the backup interface * if we have one. */ if (found == 0 && alt_if) { KKASSERT(used == 0); mc = m; used = 1; bridge_handoff(sc, alt_if, mc, from_us); } if (used == 0) m_freem(m); return (0); /* * Unicast */ sendunicast: dst_if = bridge_select_unicast(sc, dst_if, 0, m); if (sc->sc_span) bridge_span(sc, m); if (dst_if == NULL) m_freem(m); else bridge_handoff(sc, dst_if, m, from_us); return (0); } /* * Returns the bridge interface associated with an ifc. * Pass ifp->if_bridge (must not be NULL). Used by the ARP * code to supply the bridge for the is-at info, making * the bridge responsible for matching local addresses. * * Without this the ARP code will supply bridge member interfaces * for the is-at which makes it difficult the bridge to fail-over * interfaces (among other things). */ static struct ifnet * bridge_interface(void *if_bridge) { struct bridge_softc *sc = if_bridge; return (sc->sc_ifp); } /* * bridge_start: * * Start output on a bridge. */ static void bridge_start(struct ifnet *ifp, struct ifaltq_subque *ifsq) { struct bridge_softc *sc = ifp->if_softc; ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq); ASSERT_ALTQ_SQ_SERIALIZED_HW(ifsq); ASSERT_NETISR_NCPUS(mycpuid); ifsq_set_oactive(ifsq); for (;;) { struct ifnet *dst_if = NULL; struct ether_header *eh; struct mbuf *m; m = ifsq_dequeue(ifsq); if (m == NULL) break; mbuftrackid(m, 75); if (m->m_len < sizeof(*eh)) { m = m_pullup(m, sizeof(*eh)); if (m == NULL) { IFNET_STAT_INC(ifp, oerrors, 1); continue; } } eh = mtod(m, struct ether_header *); BPF_MTAP(ifp, m); IFNET_STAT_INC(ifp, opackets, 1); if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) dst_if = bridge_rtlookup(sc, eh->ether_dhost); /* * Multicast or broadcast */ if (dst_if == NULL) { bridge_start_bcast(sc, m); continue; } /* * Unicast */ dst_if = bridge_select_unicast(sc, dst_if, 0, m); if (dst_if == NULL) m_freem(m); else bridge_enqueue(dst_if, m); } ifsq_clr_oactive(ifsq); } /* * bridge_forward: * * Forward packets received on a bridge interface via the input * path. * * This implements the forwarding function of the bridge. */ static void bridge_forward(struct bridge_softc *sc, struct mbuf *m) { struct bridge_iflist *bif; struct ifnet *src_if, *dst_if, *ifp; struct ether_header *eh; int from_blocking; mbuftrackid(m, 66); src_if = m->m_pkthdr.rcvif; ifp = sc->sc_ifp; ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp); /* * packet coming in on the bridge is also going out on the bridge, * but ether code won't adjust output stats for the bridge because * we are changing the interface to something else. */ IFNET_STAT_INC(ifp, opackets, 1); IFNET_STAT_INC(ifp, obytes, m->m_pkthdr.len); /* * Look up the bridge_iflist. */ bif = bridge_lookup_member_if(sc, src_if); if (bif == NULL) { /* Interface is not a bridge member (anymore?) */ m_freem(m); return; } /* * In spanning tree mode receiving a packet from an interface * in a BLOCKING state is allowed, it could be a member of last * resort from the sender's point of view, but forwarding it is * not allowed. * * The sender's spanning tree will eventually sync up and the * sender will go into a BLOCKING state too (but this still may be * an interface of last resort during state changes). */ if (bif->bif_flags & IFBIF_STP) { switch (bif->bif_state) { case BSTP_IFSTATE_L1BLOCKING: case BSTP_IFSTATE_LISTENING: case BSTP_IFSTATE_DISABLED: m_freem(m); return; default: /* learning, blocking, bonded, forwarding */ break; } from_blocking = (bif->bif_state == BSTP_IFSTATE_BLOCKING); } else { from_blocking = 0; } eh = mtod(m, struct ether_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 && from_blocking == 0 && ETHER_IS_MULTICAST(eh->ether_shost) == 0 && (eh->ether_shost[0] == 0 && eh->ether_shost[1] == 0 && eh->ether_shost[2] == 0 && eh->ether_shost[3] == 0 && eh->ether_shost[4] == 0 && eh->ether_shost[5] == 0) == 0) { bridge_rtupdate(sc, eh->ether_shost, src_if, IFBAF_DYNAMIC); } /* * Don't forward from an interface in the listening or learning * state. That is, in the learning state we learn information * but we throw away the packets. * * We let through packets on interfaces in the blocking state. * The blocking state is applicable to the send side, not the * receive side. */ if ((bif->bif_flags & IFBIF_STP) != 0 && (bif->bif_state == BSTP_IFSTATE_LISTENING || bif->bif_state == BSTP_IFSTATE_LEARNING)) { m_freem(m); return; } /* * 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. * * src_if implies the entire bonding set so we have to compare MAC * addresses and not just if pointers. */ if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { dst_if = bridge_rtlookup(sc, eh->ether_dhost); if (dst_if && memcmp(IF_LLADDR(src_if), IF_LLADDR(dst_if), ETHER_ADDR_LEN) == 0) { m_freem(m); return; } } else { /* ...forward it to all interfaces. */ IFNET_STAT_INC(ifp, imcasts, 1); dst_if = NULL; } /* * Brodcast if we do not have forwarding information. However, if * we received the packet on a blocking interface we do not do this * (unless you really want to blow up your network). */ if (dst_if == NULL) { if (from_blocking) m_freem(m); else bridge_broadcast(sc, src_if, m); return; } dst_if = bridge_select_unicast(sc, dst_if, from_blocking, m); if (dst_if == NULL) { m_freem(m); return; } if (inet_pfil_hook.ph_hashooks > 0 #ifdef INET6 || inet6_pfil_hook.ph_hashooks > 0 #endif ) { if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) return; if (m == NULL) return; if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) return; if (m == NULL) return; } bridge_handoff(sc, dst_if, m, 0); } /* * bridge_input: * * Receive input from a member interface. Queue the packet for * bridging if it is not for us. */ static struct mbuf * bridge_input(struct ifnet *ifp, struct mbuf *m) { struct bridge_softc *sc = ifp->if_bridge; struct bridge_iflist *bif; struct ifnet *bifp, *new_ifp; struct ether_header *eh; struct mbuf *mc, *mc2; ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp); ASSERT_NETISR_NCPUS(mycpuid); mbuftrackid(m, 67); /* * Make sure that we are still a member of a bridge interface. */ if (sc == NULL) return m; new_ifp = NULL; bifp = sc->sc_ifp; if ((bifp->if_flags & IFF_RUNNING) == 0) goto out; /* * 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 various counters * associated with this bridge. */ if (bifp->if_flags & IFF_MONITOR) { /* * Change input interface to this bridge * * Update bridge's ifnet statistics */ m->m_pkthdr.rcvif = bifp; BPF_MTAP(bifp, m); IFNET_STAT_INC(bifp, ipackets, 1); IFNET_STAT_INC(bifp, ibytes, m->m_pkthdr.len); if (m->m_flags & (M_MCAST | M_BCAST)) IFNET_STAT_INC(bifp, imcasts, 1); m_freem(m); m = NULL; goto out; } /* * Handle the ether_header * * In all cases if the packet is destined for us via our MAC * we must clear BRIDGE_MBUF_TAGGED to ensure that we don't * repeat the source MAC out the same interface. * * This first test against our bridge MAC is the fast-path. * * NOTE! The bridge interface can serve as an endpoint for * communication but normally there are no IPs associated * with it so you cannot route through it. Instead what * you do is point your default route *THROUGH* the bridge * to the actual default router for one of the bridged spaces. * * Another possibility is to put all your IP specifications * on the bridge instead of on the individual interfaces. If * you do this it should be possible to use the bridge as an * end point and route (rather than switch) through it using * the default route or ipfw forwarding rules. */ /* * Acquire header */ if (m->m_len < ETHER_HDR_LEN) { m = m_pullup(m, ETHER_HDR_LEN); if (m == NULL) goto out; } eh = mtod(m, struct ether_header *); m->m_pkthdr.fw_flags |= BRIDGE_MBUF_TAGGED; bcopy(eh->ether_shost, m->m_pkthdr.ether_br_shost, ETHER_ADDR_LEN); if ((bridge_debug & 1) && (ntohs(eh->ether_type) == ETHERTYPE_ARP || ntohs(eh->ether_type) == ETHERTYPE_REVARP)) { kprintf("%02x:%02x:%02x:%02x:%02x:%02x " "%02x:%02x:%02x:%02x:%02x:%02x type %04x " "lla %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], 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_type, ((u_char *)IF_LLADDR(bifp))[0], ((u_char *)IF_LLADDR(bifp))[1], ((u_char *)IF_LLADDR(bifp))[2], ((u_char *)IF_LLADDR(bifp))[3], ((u_char *)IF_LLADDR(bifp))[4], ((u_char *)IF_LLADDR(bifp))[5] ); } /* * If the packet is for us, set the packets source as the * bridge, and return the packet back to ifnet.if_input for * local processing. */ if (memcmp(eh->ether_dhost, IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) { /* * We must still record the source interface in our * addr cache, otherwise our bridge won't know where * to send responses and will broadcast them. */ bif = bridge_lookup_member_if(sc, ifp); if ((bif->bif_flags & IFBIF_LEARNING) && ((bif->bif_flags & IFBIF_STP) == 0 || bif->bif_state != BSTP_IFSTATE_BLOCKING)) { bridge_rtupdate(sc, eh->ether_shost, ifp, IFBAF_DYNAMIC); } /* * Perform pfil hooks. */ m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; KASSERT(bifp->if_bridge == NULL, ("loop created in bridge_input")); if (pfil_member != 0) { if (inet_pfil_hook.ph_hashooks > 0 #ifdef INET6 || inet6_pfil_hook.ph_hashooks > 0 #endif ) { if (bridge_pfil(&m, NULL, ifp, PFIL_IN) != 0) goto out; if (m == NULL) goto out; } } /* * Set new_ifp and skip to the end. This will trigger code * to reinput the packet and run it into our stack. */ new_ifp = bifp; goto out; } /* * Tap all packets arriving on the bridge, no matter if * they are local destinations or not. In is in. * * Update bridge's ifnet statistics */ BPF_MTAP(bifp, m); IFNET_STAT_INC(bifp, ipackets, 1); IFNET_STAT_INC(bifp, ibytes, m->m_pkthdr.len); if (m->m_flags & (M_MCAST | M_BCAST)) IFNET_STAT_INC(bifp, imcasts, 1); bif = bridge_lookup_member_if(sc, ifp); if (bif == NULL) goto out; if (sc->sc_span) bridge_span(sc, m); if (m->m_flags & (M_BCAST | M_MCAST)) { /* * Tap off 802.1D packets; they do not get forwarded. */ if (memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { ifnet_serialize_all(bifp); bstp_input(sc, bif, m); ifnet_deserialize_all(bifp); /* m is freed by bstp_input */ m = NULL; goto out; } /* * Other than 802.11d packets, ignore packets if the * interface is not in a good state. * * NOTE: Broadcast/mcast packets received on a blocking or * learning interface are allowed for local processing. * * The sending side of a blocked port will stop * transmitting when a better alternative is found. * However, later on we will disallow the forwarding * of bcast/mcsat packets over a blocking interface. */ if (bif->bif_flags & IFBIF_STP) { switch (bif->bif_state) { case BSTP_IFSTATE_L1BLOCKING: case BSTP_IFSTATE_LISTENING: case BSTP_IFSTATE_DISABLED: goto out; default: /* blocking, learning, bonded, forwarding */ break; } } /* * 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_NOWAIT); if (mc == NULL) goto out; /* * It's just too dangerous to allow bcast/mcast over a * blocked interface, eventually the network will sort * itself out and a better path will be found. */ if ((bif->bif_flags & IFBIF_STP) == 0 || bif->bif_state != BSTP_IFSTATE_BLOCKING) { bridge_forward(sc, 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_NOWAIT); #ifdef notyet if (mc2 != NULL) { /* Keep the layer3 header aligned */ int i = min(mc2->m_pkthdr.len, max_protohdr); mc2 = m_copyup(mc2, i, ETHER_ALIGN); } #endif if (mc2 != NULL) { /* * Don't tap to bpf(4) again; we have already done * the tapping. * * Leave m_pkthdr.rcvif alone, so ARP replies are * processed as coming in on the correct interface. * * Clear the bridge flag for local processing in * case the packet gets routed. */ mc2->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; ether_reinput_oncpu(bifp, mc2, 0); } /* Return the original packet for local processing. */ goto out; } /* * Input of a unicast packet. We have to allow unicast packets * input from links in the BLOCKING state as this might be an * interface of last resort. * * NOTE: We explicitly ignore normal packets received on a link * in the BLOCKING state. The point of being in that state * is to avoid getting duplicate packets. * * HOWEVER, if LINK2 is set the normal spanning tree code * will mark an interface BLOCKING to avoid multi-cast/broadcast * loops. Unicast packets CAN still loop if we allow the * case (hence we only do it in LINK2), but it isn't quite as * bad as a broadcast packet looping. */ if (bif->bif_flags & IFBIF_STP) { switch (bif->bif_state) { case BSTP_IFSTATE_L1BLOCKING: case BSTP_IFSTATE_LISTENING: case BSTP_IFSTATE_DISABLED: goto out; default: /* blocking, bonded, forwarding, learning */ break; } } /* * Unicast. Make sure it's not for us. * * This loop is MPSAFE; the only blocking operation (bridge_rtupdate) * is followed by breaking out of the loop. */ TAILQ_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) { if (bif->bif_ifp->if_type != IFT_ETHER) continue; /* * It is destined for an interface linked to the bridge. * We want the bridge itself to take care of link level * forwarding to member interfaces so reinput on the bridge. * i.e. if you ping an IP on a target interface associated * with the bridge, the arp is-at response should indicate * the bridge MAC. * * Only update our addr list when learning if the port * is not in a blocking state. If it is we still allow * the packet but we do not try to learn from it. */ if (memcmp(IF_LLADDR(bif->bif_ifp), eh->ether_dhost, ETHER_ADDR_LEN) == 0) { if (bif->bif_ifp != ifp) { /* XXX loop prevention */ m->m_flags |= M_ETHER_BRIDGED; } if ((bif->bif_flags & IFBIF_LEARNING) && ((bif->bif_flags & IFBIF_STP) == 0 || bif->bif_state != BSTP_IFSTATE_BLOCKING)) { bridge_rtupdate(sc, eh->ether_shost, ifp, IFBAF_DYNAMIC); } new_ifp = bifp; /* not bif->bif_ifp */ m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; goto out; } /* * Ignore received packets that were sent by us. */ if (memcmp(IF_LLADDR(bif->bif_ifp), eh->ether_shost, ETHER_ADDR_LEN) == 0) { m_freem(m); m = NULL; goto out; } } /* * It isn't for us. * * Perform the bridge forwarding function, but disallow bridging * to interfaces in the blocking state if the packet came in on * an interface in the blocking state. * * (bridge_forward also updates the addr cache). */ bridge_forward(sc, m); m = NULL; /* * ether_reinput_oncpu() will reprocess rcvif as * coming from new_ifp (since we do not specify * REINPUT_KEEPRCVIF). */ out: if (new_ifp != NULL) { /* * Clear the bridge flag for local processing in * case the packet gets routed. */ ether_reinput_oncpu(new_ifp, m, REINPUT_RUNBPF); m = NULL; } return (m); } /* * bridge_start_bcast: * * Broadcast the packet sent from bridge to all member * interfaces. * This is a simplified version of bridge_broadcast(), however, * this function expects caller to hold bridge's serializer. */ static void bridge_start_bcast(struct bridge_softc *sc, struct mbuf *m) { struct bridge_iflist *bif; struct mbuf *mc; struct ifnet *dst_if, *alt_if, *bifp; int used = 0; int found = 0; int alt_priority; mbuftrackid(m, 68); bifp = sc->sc_ifp; ASSERT_IFNET_SERIALIZED_ALL(bifp); /* * Following loop is MPSAFE; nothing is blocking * in the loop body. * * NOTE: We transmit through an member in the BLOCKING state only * as a last resort. */ alt_if = NULL; alt_priority = 0; TAILQ_FOREACH(bif, &sc->sc_iflists[mycpuid], bif_next) { dst_if = bif->bif_ifp; if (bif->bif_flags & IFBIF_STP) { switch (bif->bif_state) { case BSTP_IFSTATE_BLOCKING: if (bif->bif_priority > alt_priority) { alt_priority = bif->bif_priority; alt_if = bif->bif_ifp; } /* fall through */ case BSTP_IFSTATE_L1BLOCKING: case BSTP_IFSTATE_DISABLED: continue; default: /* listening, learning, bonded, forwarding */ break; } } if ((bif->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(bif, bif_next) == NULL) { mc = m; used = 1; } else { mc = m_copypacket(m, M_NOWAIT); if (mc == NULL) { IFNET_STAT_INC(bifp, oerrors, 1); continue; } } found = 1; bridge_enqueue(dst_if, mc); } if (found == 0 && alt_if) { KKASSERT(used == 0); mc = m; used = 1; bridge_enqueue(alt_if, mc); } if (used == 0) m_freem(m); } /* * bridge_broadcast: * * Send a frame to all interfaces that are members of the bridge, except * for the one on which the packet arrived. */ static void bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, struct mbuf *m) { struct bridge_iflist *bif, *nbif; struct ether_header *eh; struct mbuf *mc; struct ifnet *dst_if, *alt_if, *bifp; int used; int found; int alt_priority; int from_us; uint8_t alt_state; mbuftrackid(m, 69); bifp = sc->sc_ifp; ASSERT_IFNET_NOT_SERIALIZED_ALL(bifp); eh = mtod(m, struct ether_header *); from_us = bridge_from_us(sc, eh); if (inet_pfil_hook.ph_hashooks > 0 #ifdef INET6 || inet6_pfil_hook.ph_hashooks > 0 #endif ) { if (bridge_pfil(&m, bifp, src_if, PFIL_IN) != 0) return; if (m == NULL) return; /* Filter on the bridge interface before broadcasting */ if (bridge_pfil(&m, bifp, NULL, PFIL_OUT) != 0) return; if (m == NULL) return; } alt_state = BSTP_IFSTATE_LEARNING; alt_if = NULL; alt_priority = 0; found = 0; used = 0; TAILQ_FOREACH_MUTABLE(bif, &sc->sc_iflists[mycpuid], bif_next, nbif) { dst_if = bif->bif_ifp; if ((dst_if->if_flags & IFF_RUNNING) == 0) continue; /* * Don't bounce the packet out the same interface it came * in on. We have to test MAC addresses because a packet * can come in a bonded interface and we don't want it to * be echod out the forwarding interface for the same bonding * set. */ if (src_if && memcmp(IF_LLADDR(src_if), IF_LLADDR(dst_if), ETHER_ADDR_LEN) == 0) { continue; } /* * Generally speaking we only broadcast through forwarding * interfaces. If no interfaces are available we select * a BONDED, BLOCKING, or LEARNING interface to forward * through. */ if (bif->bif_flags & IFBIF_STP) { switch (bif->bif_state) { case BSTP_IFSTATE_LEARNING: if (alt_state == BSTP_IFSTATE_LEARNING && bif->bif_priority > alt_priority) { alt_priority = bif->bif_priority; alt_if = bif->bif_ifp; } continue; case BSTP_IFSTATE_BLOCKING: if (alt_state == BSTP_IFSTATE_LEARNING || (alt_state == BSTP_IFSTATE_BLOCKING && bif->bif_priority > alt_priority)) { alt_state = BSTP_IFSTATE_BLOCKING; alt_priority = bif->bif_priority; alt_if = bif->bif_ifp; } continue; case BSTP_IFSTATE_BONDED: if (alt_state != BSTP_IFSTATE_BONDED || bif->bif_priority > alt_priority) { alt_state = BSTP_IFSTATE_BONDED; alt_priority = bif->bif_priority; alt_if = bif->bif_ifp; } continue; case BSTP_IFSTATE_L1BLOCKING: case BSTP_IFSTATE_DISABLED: case BSTP_IFSTATE_LISTENING: continue; default: /* forwarding */ break; } } /* * FORWARDING */ if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && (m->m_flags & (M_BCAST|M_MCAST)) == 0) { continue; } /* * Last interface in list? */ if (TAILQ_NEXT(bif, bif_next) == NULL) { mc = m; used = 1; } else { mc = m_copypacket(m, M_NOWAIT); if (mc == NULL) { IFNET_STAT_INC(sc->sc_ifp, oerrors, 1); continue; } } found = 1; /* * 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 (inet_pfil_hook.ph_hashooks > 0 #ifdef INET6 || inet6_pfil_hook.ph_hashooks > 0 #endif ) { if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) continue; if (mc == NULL) continue; } bridge_handoff(sc, dst_if, mc, from_us); if (nbif != NULL && !nbif->bif_onlist) { KKASSERT(bif->bif_onlist); nbif = TAILQ_NEXT(bif, bif_next); } } if (found == 0 && alt_if) { KKASSERT(used == 0); mc = m; used = 1; bridge_enqueue(alt_if, mc); } if (used == 0) m_freem(m); } /* * 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, *bifp; struct mbuf *mc; mbuftrackid(m, 70); bifp = sc->sc_ifp; ifnet_serialize_all(bifp); 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_NOWAIT); if (mc == NULL) { IFNET_STAT_INC(sc->sc_ifp, oerrors, 1); continue; } bridge_enqueue(dst_if, mc); } ifnet_deserialize_all(bifp); } static void bridge_rtmsg_sync_handler(netmsg_t msg) { netisr_forwardmsg(&msg->base, mycpuid + 1); } static void bridge_rtmsg_sync(struct bridge_softc *sc) { struct netmsg_base msg; ASSERT_IFNET_NOT_SERIALIZED_ALL(sc->sc_ifp); /* XXX use netmsg_service_sync */ netmsg_init(&msg, NULL, &curthread->td_msgport, 0, bridge_rtmsg_sync_handler); netisr_domsg(&msg, 0); } static __inline void bridge_rtinfo_update(struct bridge_rtinfo *bri, struct ifnet *dst_if, int setflags, uint8_t flags, uint32_t timeo) { if ((bri->bri_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && bri->bri_ifp != dst_if) bri->bri_ifp = dst_if; if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && bri->bri_expire != time_uptime + timeo) bri->bri_expire = time_uptime + timeo; if (setflags) bri->bri_flags = flags; } static int bridge_rtinstall_oncpu(struct bridge_softc *sc, const uint8_t *dst, struct ifnet *dst_if, int setflags, uint8_t flags, struct bridge_rtinfo **bri0) { struct bridge_rtnode *brt; struct bridge_rtinfo *bri; if (mycpuid == 0) { brt = bridge_rtnode_lookup(sc, dst); if (brt != NULL) { /* * rtnode for 'dst' already exists. We inform the * caller about this by leaving bri0 as NULL. The * caller will terminate the intallation upon getting * NULL bri0. However, we still need to update the * rtinfo. */ KKASSERT(*bri0 == NULL); /* Update rtinfo */ bridge_rtinfo_update(brt->brt_info, dst_if, setflags, flags, sc->sc_brttimeout); return 0; } /* * We only need to check brtcnt on CPU0, since if limit * is to be exceeded, ENOSPC is returned. Caller knows * this and will terminate the installation. */ if (sc->sc_brtcnt >= sc->sc_brtmax) return ENOSPC; KKASSERT(*bri0 == NULL); bri = kmalloc(sizeof(struct bridge_rtinfo), M_DEVBUF, M_WAITOK | M_ZERO); *bri0 = bri; /* Setup rtinfo */ bri->bri_flags = IFBAF_DYNAMIC; bridge_rtinfo_update(bri, dst_if, setflags, flags, sc->sc_brttimeout); } else { bri = *bri0; KKASSERT(bri != NULL); } brt = kmalloc(sizeof(struct bridge_rtnode), M_DEVBUF, M_WAITOK | M_ZERO); memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); brt->brt_info = bri; atomic_add_int(&bri->bri_refs, 1); bridge_rtnode_insert(sc, brt); return 0; } static void bridge_rtinstall_handler(netmsg_t msg) { struct netmsg_brsaddr *brmsg = (struct netmsg_brsaddr *)msg; int error; error = bridge_rtinstall_oncpu(brmsg->br_softc, brmsg->br_dst, brmsg->br_dst_if, brmsg->br_setflags, brmsg->br_flags, &brmsg->br_rtinfo); if (error) { KKASSERT(mycpuid == 0 && brmsg->br_rtinfo == NULL); netisr_replymsg(&brmsg->base, error); return; } else if (brmsg->br_rtinfo == NULL) { /* rtnode already exists for 'dst' */ KKASSERT(mycpuid == 0); netisr_replymsg(&brmsg->base, 0); return; } netisr_forwardmsg(&brmsg->base, mycpuid + 1); } /* * bridge_rtupdate: * * Add/Update a bridge routing entry. */ static int bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, struct ifnet *dst_if, uint8_t flags) { struct bridge_rtnode *brt; /* * A route for this destination might already exist. If so, * update it, otherwise create a new one. */ if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) { struct netmsg_brsaddr *brmsg; if (sc->sc_brtcnt >= sc->sc_brtmax) return ENOSPC; brmsg = kmalloc(sizeof(*brmsg), M_LWKTMSG, M_WAITOK | M_NULLOK); if (brmsg == NULL) return ENOMEM; netmsg_init(&brmsg->base, NULL, &netisr_afree_rport, 0, bridge_rtinstall_handler); memcpy(brmsg->br_dst, dst, ETHER_ADDR_LEN); brmsg->br_dst_if = dst_if; brmsg->br_flags = flags; brmsg->br_setflags = 0; brmsg->br_softc = sc; brmsg->br_rtinfo = NULL; netisr_sendmsg(&brmsg->base, 0); return 0; } bridge_rtinfo_update(brt->brt_info, dst_if, 0, flags, sc->sc_brttimeout); return 0; } static int bridge_rtsaddr(struct bridge_softc *sc, const uint8_t *dst, struct ifnet *dst_if, uint8_t flags) { struct netmsg_brsaddr brmsg; ASSERT_IFNET_NOT_SERIALIZED_ALL(sc->sc_ifp); netmsg_init(&brmsg.base, NULL, &curthread->td_msgport, 0, bridge_rtinstall_handler); memcpy(brmsg.br_dst, dst, ETHER_ADDR_LEN); brmsg.br_dst_if = dst_if; brmsg.br_flags = flags; brmsg.br_setflags = 1; brmsg.br_softc = sc; brmsg.br_rtinfo = NULL; return netisr_domsg(&brmsg.base, 0); } /* * bridge_rtlookup: * * Lookup the destination interface for an address. */ static struct ifnet * bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) { struct bridge_rtnode *brt; if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) return NULL; return brt->brt_info->bri_ifp; } static void bridge_rtreap_handler(netmsg_t msg) { struct bridge_softc *sc = msg->lmsg.u.ms_resultp; struct bridge_rtnode *brt, *nbrt; LIST_FOREACH_MUTABLE(brt, &sc->sc_rtlists[mycpuid], brt_list, nbrt) { if (brt->brt_info->bri_dead) bridge_rtnode_destroy(sc, brt); } netisr_forwardmsg(&msg->base, mycpuid + 1); } static void bridge_rtreap(struct bridge_softc *sc) { struct netmsg_base msg; ASSERT_IFNET_NOT_SERIALIZED_ALL(sc->sc_ifp); netmsg_init(&msg, NULL, &curthread->td_msgport, 0, bridge_rtreap_handler); msg.lmsg.u.ms_resultp = sc; netisr_domsg(&msg, 0); } static void bridge_rtreap_async(struct bridge_softc *sc) { struct netmsg_base *msg; msg = kmalloc(sizeof(*msg), M_LWKTMSG, M_WAITOK); netmsg_init(msg, NULL, &netisr_afree_rport, 0, bridge_rtreap_handler); msg->lmsg.u.ms_resultp = sc; netisr_sendmsg(msg, 0); } /* * 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; int dead; ASSERT_IFNET_NOT_SERIALIZED_ALL(sc->sc_ifp); /* Make sure we actually need to do this. */ if (sc->sc_brtcnt <= sc->sc_brtmax) return; /* * Find out how many rtnodes are dead */ dead = bridge_rtage_finddead(sc); KKASSERT(dead <= sc->sc_brtcnt); if (sc->sc_brtcnt - dead <= sc->sc_brtmax) { /* Enough dead rtnodes are found */ bridge_rtreap(sc); return; } /* * Kill some dynamic rtnodes to meet the brtmax */ LIST_FOREACH(brt, &sc->sc_rtlists[mycpuid], brt_list) { struct bridge_rtinfo *bri = brt->brt_info; if (bri->bri_dead) { /* * We have counted this rtnode in * bridge_rtage_finddead() */ continue; } if ((bri->bri_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { bri->bri_dead = 1; ++dead; KKASSERT(dead <= sc->sc_brtcnt); if (sc->sc_brtcnt - dead <= sc->sc_brtmax) { /* Enough rtnodes are collected */ break; } } } if (dead) bridge_rtreap(sc); } /* * bridge_timer: * * Aging timer for the bridge. */ static void bridge_timer(void *arg) { struct bridge_softc *sc = arg; struct netmsg_base *msg; KKASSERT(mycpuid == BRIDGE_CFGCPU); crit_enter(); if (callout_pending(&sc->sc_brcallout) || !callout_active(&sc->sc_brcallout)) { crit_exit(); return; } callout_deactivate(&sc->sc_brcallout); msg = &sc->sc_brtimemsg; KKASSERT(msg->lmsg.ms_flags & MSGF_DONE); lwkt_sendmsg_oncpu(BRIDGE_CFGPORT, &msg->lmsg); crit_exit(); } static void bridge_timer_handler(netmsg_t msg) { struct bridge_softc *sc = msg->lmsg.u.ms_resultp; KKASSERT(&curthread->td_msgport == BRIDGE_CFGPORT); crit_enter(); /* Reply ASAP */ lwkt_replymsg(&msg->lmsg, 0); crit_exit(); bridge_rtage(sc); if (sc->sc_ifp->if_flags & IFF_RUNNING) { callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, bridge_timer, sc); } } static int bridge_rtage_finddead(struct bridge_softc *sc) { struct bridge_rtnode *brt; int dead = 0; LIST_FOREACH(brt, &sc->sc_rtlists[mycpuid], brt_list) { struct bridge_rtinfo *bri = brt->brt_info; if ((bri->bri_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && time_uptime >= bri->bri_expire) { bri->bri_dead = 1; ++dead; KKASSERT(dead <= sc->sc_brtcnt); } } return dead; } /* * bridge_rtage: * * Perform an aging cycle. */ static void bridge_rtage(struct bridge_softc *sc) { ASSERT_IFNET_NOT_SERIALIZED_ALL(sc->sc_ifp); if (bridge_rtage_finddead(sc)) bridge_rtreap(sc); } /* * bridge_rtflush: * * Remove all dynamic addresses from the bridge. */ static void bridge_rtflush(struct bridge_softc *sc, int bf) { struct bridge_rtnode *brt; int reap; reap = 0; LIST_FOREACH(brt, &sc->sc_rtlists[mycpuid], brt_list) { struct bridge_rtinfo *bri = brt->brt_info; if ((bf & IFBF_FLUSHALL) || (bri->bri_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { bri->bri_dead = 1; reap = 1; } } if (reap) { if (bf & IFBF_FLUSHSYNC) bridge_rtreap(sc); else bridge_rtreap_async(sc); } } /* * bridge_rtdaddr: * * Remove an address from the table. */ static int bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) { struct bridge_rtnode *brt; ASSERT_IFNET_NOT_SERIALIZED_ALL(sc->sc_ifp); if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) return (ENOENT); /* TODO: add a cheaper delete operation */ brt->brt_info->bri_dead = 1; bridge_rtreap(sc); return (0); } /* * bridge_rtdelete: * * Delete routes to a speicifc member interface. */ void bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int bf) { struct bridge_rtnode *brt; int reap; reap = 0; LIST_FOREACH(brt, &sc->sc_rtlists[mycpuid], brt_list) { struct bridge_rtinfo *bri = brt->brt_info; if (bri->bri_ifp == ifp && ((bf & IFBF_FLUSHALL) || (bri->bri_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) { bri->bri_dead = 1; reap = 1; } } if (reap) { if (bf & IFBF_FLUSHSYNC) bridge_rtreap(sc); else bridge_rtreap_async(sc); } } /* * bridge_rtable_init: * * Initialize the route table for this bridge. */ static void bridge_rtable_init(struct bridge_softc *sc) { int cpu; /* * Initialize per-cpu hash tables */ sc->sc_rthashs = kmalloc(sizeof(*sc->sc_rthashs) * netisr_ncpus, M_DEVBUF, M_WAITOK); for (cpu = 0; cpu < netisr_ncpus; ++cpu) { int i; sc->sc_rthashs[cpu] = kmalloc(sizeof(struct bridge_rtnode_head) * BRIDGE_RTHASH_SIZE, M_DEVBUF, M_WAITOK); for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) LIST_INIT(&sc->sc_rthashs[cpu][i]); } sc->sc_rthash_key = karc4random(); /* * Initialize per-cpu lists */ sc->sc_rtlists = kmalloc(sizeof(struct bridge_rtnode_head) * netisr_ncpus, M_DEVBUF, M_WAITOK); for (cpu = 0; cpu < netisr_ncpus; ++cpu) LIST_INIT(&sc->sc_rtlists[cpu]); } /* * bridge_rtable_fini: * * Deconstruct the route table for this bridge. */ static void bridge_rtable_fini(struct bridge_softc *sc) { int cpu; /* * Free per-cpu hash tables */ for (cpu = 0; cpu < netisr_ncpus; ++cpu) kfree(sc->sc_rthashs[cpu], M_DEVBUF); kfree(sc->sc_rthashs, M_DEVBUF); /* * Free per-cpu lists */ kfree(sc->sc_rtlists, 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. */ static struct bridge_rtnode * bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) { struct bridge_rtnode *brt; uint32_t hash; int dir; hash = bridge_rthash(sc, addr); LIST_FOREACH(brt, &sc->sc_rthashs[mycpuid][hash], brt_hash) { dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); if (dir == 0) return (brt); if (dir > 0) return (NULL); } return (NULL); } /* * bridge_rtnode_insert: * * Insert the specified bridge node into the route table. * Caller has to make sure that rtnode does not exist. */ static void bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) { struct bridge_rtnode *lbrt; uint32_t hash; int dir; hash = bridge_rthash(sc, brt->brt_addr); lbrt = LIST_FIRST(&sc->sc_rthashs[mycpuid][hash]); if (lbrt == NULL) { LIST_INSERT_HEAD(&sc->sc_rthashs[mycpuid][hash], brt, brt_hash); goto out; } do { dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); KASSERT(dir != 0, ("rtnode already exist")); 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); panic("no suitable position found for rtnode"); out: LIST_INSERT_HEAD(&sc->sc_rtlists[mycpuid], brt, brt_list); if (mycpuid == 0) { /* * Update the brtcnt. * We only need to do it once and we do it on CPU0. */ sc->sc_brtcnt++; } } /* * bridge_rtnode_destroy: * * Destroy a bridge rtnode. */ static void bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) { struct bridge_rtinfo *bri; LIST_REMOVE(brt, brt_hash); LIST_REMOVE(brt, brt_list); bri = brt->brt_info; /* * The bri_dead flag can be set asynchronously and catch some gc's * in the middle, don't free bri until all references have actually * gone away. */ if (atomic_fetchadd_int(&bri->bri_refs, -1) == 1) { /* Free rtinfo associated with rtnode on the last cpu */ kfree(bri, M_DEVBUF); brt->brt_info = NULL; /* safety */ } kfree(brt, M_DEVBUF); if (mycpuid == 0) { /* Update brtcnt only on CPU0 */ sc->sc_brtcnt--; } } static __inline int bridge_post_pfil(struct mbuf *m) { if (m->m_pkthdr.fw_flags & IPFORWARD_MBUF_TAGGED) return EOPNOTSUPP; /* Not yet */ if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) return EOPNOTSUPP; return 0; } /* * 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 *ip; struct llc llc1; u_int16_t ether_type; snap = 0; error = -1; /* Default error if not error == 0 */ if (pfil_bridge == 0 && pfil_member == 0) return (0); /* filtering is disabled */ i = min((*mp)->m_pkthdr.len, max_protohdr); if ((*mp)->m_len < i) { *mp = m_pullup(*mp, i); if (*mp == NULL) { kprintf("%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: return (0); /* Automatically pass */ 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, &eh2); m_adj(*mp, ETHER_HDR_LEN); /* Strip off snap header, if present */ if (snap) { m_copydata(*mp, 0, sizeof(struct llc), &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; } error = 0; /* * Run the packet through pfil */ switch (ether_type) { case ETHERTYPE_IP: /* * 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); if (*mp == NULL || error != 0) /* filter may consume */ break; error = bridge_post_pfil(*mp); if (error) break; } if (pfil_member && ifp != NULL) { error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, dir); if (*mp == NULL || error != 0) /* filter may consume */ break; error = bridge_post_pfil(*mp); if (error) break; } if (pfil_bridge && dir == PFIL_IN && bifp != NULL) { error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, dir); if (*mp == NULL || error != 0) /* filter may consume */ break; error = bridge_post_pfil(*mp); if (error) 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)) == NULL) goto bad; ip = mtod(*mp, struct ip *); if (ip == NULL) goto bad; } 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); if (*mp == NULL || error != 0) /* filter may consume */ break; if (pfil_member && ifp != NULL) error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp, dir); 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); 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_NOWAIT); if (*mp == NULL) return (error); bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); } M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 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 0 /* notyet */ 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 #endif #ifndef __predict_false #define __predict_false(x) x #endif 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)) == NULL) { 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 0 /* notyet */ 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 #endif 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_NOWAIT); if (m0 == NULL) { error = ENOBUFS; continue; } bcopy(llc, mtod(m0, caddr_t), sizeof(struct llc)); } M_PREPEND(m0, ETHER_HDR_LEN, M_NOWAIT); 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); } static void bridge_enqueue_handler(netmsg_t msg) { struct netmsg_packet *nmp; struct ifnet *dst_ifp; struct mbuf *m; nmp = &msg->packet; m = nmp->nm_packet; dst_ifp = nmp->base.lmsg.u.ms_resultp; mbuftrackid(m, 71); bridge_handoff(dst_ifp->if_bridge, dst_ifp, m, 1); } static void bridge_handoff(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, int from_us) { struct mbuf *m0; struct ifnet *bifp; bifp = sc->sc_ifp; mbuftrackid(m, 72); /* We may be sending a fragment so traverse the mbuf */ for (; m; m = m0) { struct altq_pktattr pktattr; m0 = m->m_nextpkt; m->m_nextpkt = NULL; /* * If being sent from our host override ether_shost * with the bridge MAC. This is mandatory for ARP * so things don't get confused. In particular we * don't want ARPs to get associated with link interfaces * under the bridge which might or might not stay valid. * * Also override ether_shost when relaying a packet out * the same interface it came in on, due to multi-homed * addresses & default routes, otherwise switches will * get very confused. * * Otherwise if we are in transparent mode. */ if (from_us || m->m_pkthdr.rcvif == dst_ifp) { m_copyback(m, offsetof(struct ether_header, ether_shost), ETHER_ADDR_LEN, IF_LLADDR(sc->sc_ifp)); } else if ((bifp->if_flags & IFF_LINK0) && (m->m_pkthdr.fw_flags & BRIDGE_MBUF_TAGGED)) { m_copyback(m, offsetof(struct ether_header, ether_shost), ETHER_ADDR_LEN, m->m_pkthdr.ether_br_shost); } /* else retain shost */ if (ifq_is_enabled(&dst_ifp->if_snd)) altq_etherclassify(&dst_ifp->if_snd, m, &pktattr); ifq_dispatch(dst_ifp, m, &pktattr); } } static void bridge_control_dispatch(netmsg_t msg) { struct netmsg_brctl *bc_msg = (struct netmsg_brctl *)msg; struct ifnet *bifp = bc_msg->bc_sc->sc_ifp; int error; ifnet_serialize_all(bifp); error = bc_msg->bc_func(bc_msg->bc_sc, bc_msg->bc_arg); ifnet_deserialize_all(bifp); lwkt_replymsg(&bc_msg->base.lmsg, error); } static int bridge_control(struct bridge_softc *sc, u_long cmd, bridge_ctl_t bc_func, void *bc_arg) { struct ifnet *bifp = sc->sc_ifp; struct netmsg_brctl bc_msg; int error; ASSERT_IFNET_SERIALIZED_ALL(bifp); bzero(&bc_msg, sizeof(bc_msg)); netmsg_init(&bc_msg.base, NULL, &curthread->td_msgport, 0, bridge_control_dispatch); bc_msg.bc_func = bc_func; bc_msg.bc_sc = sc; bc_msg.bc_arg = bc_arg; ifnet_deserialize_all(bifp); error = lwkt_domsg(BRIDGE_CFGPORT, &bc_msg.base.lmsg, 0); ifnet_serialize_all(bifp); return error; } static void bridge_add_bif_handler(netmsg_t msg) { struct netmsg_braddbif *amsg = (struct netmsg_braddbif *)msg; struct bridge_softc *sc; struct bridge_iflist *bif; sc = amsg->br_softc; bif = kmalloc(sizeof(*bif), M_DEVBUF, M_WAITOK | M_ZERO); bif->bif_ifp = amsg->br_bif_ifp; bif->bif_onlist = 1; bif->bif_info = amsg->br_bif_info; /* * runs through bif_info */ bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; TAILQ_INSERT_HEAD(&sc->sc_iflists[mycpuid], bif, bif_next); netisr_forwardmsg(&amsg->base, mycpuid + 1); } static void bridge_add_bif(struct bridge_softc *sc, struct bridge_ifinfo *bif_info, struct ifnet *ifp) { struct netmsg_braddbif amsg; ASSERT_IFNET_NOT_SERIALIZED_ALL(sc->sc_ifp); netmsg_init(&amsg.base, NULL, &curthread->td_msgport, 0, bridge_add_bif_handler); amsg.br_softc = sc; amsg.br_bif_info = bif_info; amsg.br_bif_ifp = ifp; netisr_domsg(&amsg.base, 0); } static void bridge_del_bif_handler(netmsg_t msg) { struct netmsg_brdelbif *dmsg = (struct netmsg_brdelbif *)msg; struct bridge_softc *sc; struct bridge_iflist *bif; sc = dmsg->br_softc; /* * Locate the bif associated with the br_bif_info * on the current CPU */ bif = bridge_lookup_member_ifinfo(sc, dmsg->br_bif_info); KKASSERT(bif != NULL && bif->bif_onlist); /* Remove the bif from the current CPU's iflist */ bif->bif_onlist = 0; TAILQ_REMOVE(dmsg->br_bif_list, bif, bif_next); /* Save the removed bif for later freeing */ TAILQ_INSERT_HEAD(dmsg->br_bif_list, bif, bif_next); netisr_forwardmsg(&dmsg->base, mycpuid + 1); } static void bridge_del_bif(struct bridge_softc *sc, struct bridge_ifinfo *bif_info, struct bridge_iflist_head *saved_bifs) { struct netmsg_brdelbif dmsg; ASSERT_IFNET_NOT_SERIALIZED_ALL(sc->sc_ifp); netmsg_init(&dmsg.base, NULL, &curthread->td_msgport, 0, bridge_del_bif_handler); dmsg.br_softc = sc; dmsg.br_bif_info = bif_info; dmsg.br_bif_list = saved_bifs; netisr_domsg(&dmsg.base, 0); } |