sys/net/if_bridge.c

   1 /*      $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $       */
   2
   3 /*-
   4  * SPDX-License-Identifier: BSD-4-Clause
   5  *
   6  * Copyright 2001 Wasabi Systems, Inc.
   7  * All rights reserved.
   8  *
   9  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed for the NetBSD Project by
  22  *      Wasabi Systems, Inc.
  23  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
  24  *    or promote products derived from this software without specific prior
  25  *    written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
  31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  37  * POSSIBILITY OF SUCH DAMAGE.
  38  */
  39
  40 /*
  41  * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net)
  42  * All rights reserved.
  43  *
  44  * Redistribution and use in source and binary forms, with or without
  45  * modification, are permitted provided that the following conditions
  46  * are met:
  47  * 1. Redistributions of source code must retain the above copyright
  48  *    notice, this list of conditions and the following disclaimer.
  49  * 2. Redistributions in binary form must reproduce the above copyright
  50  *    notice, this list of conditions and the following disclaimer in the
  51  *    documentation and/or other materials provided with the distribution.
  52  *
  53  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  54  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  55  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  56  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  57  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  58  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  59  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  60  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  61  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  62  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  63  * POSSIBILITY OF SUCH DAMAGE.
  64  *
  65  * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp
  66  */
  67
  68 /*
  69  * Network interface bridge support.
  70  *
  71  * TODO:
  72  *
  73  *      - Currently only supports Ethernet-like interfaces (Ethernet,
  74  *        802.11, VLANs on Ethernet, etc.)  Figure out a nice way
  75  *        to bridge other types of interfaces (maybe consider
  76  *        heterogeneous bridges).
  77  */
  78
  79 #include <sys/cdefs.h>
  80 __FBSDID("$FreeBSD$");
  81
  82 #include "opt_inet.h"
  83 #include "opt_inet6.h"
  84
  85 #include <sys/param.h>
  86 #include <sys/eventhandler.h>
  87 #include <sys/mbuf.h>
  88 #include <sys/malloc.h>
  89 #include <sys/protosw.h>
  90 #include <sys/systm.h>
  91 #include <sys/jail.h>
  92 #include <sys/time.h>
  93 #include <sys/socket.h> /* for net/if.h */
  94 #include <sys/sockio.h>
  95 #include <sys/ctype.h>  /* string functions */
  96 #include <sys/kernel.h>
  97 #include <sys/random.h>
  98 #include <sys/syslog.h>
  99 #include <sys/sysctl.h>
 100 #include <vm/uma.h>
 101 #include <sys/module.h>
 102 #include <sys/priv.h>
 103 #include <sys/proc.h>
 104 #include <sys/lock.h>
 105 #include <sys/mutex.h>
 106
 107 #include <net/bpf.h>
 108 #include <net/if.h>
 109 #include <net/if_clone.h>
 110 #include <net/if_dl.h>
 111 #include <net/if_types.h>
 112 #include <net/if_var.h>
 113 #include <net/pfil.h>
 114 #include <net/vnet.h>
 115
 116 #include <netinet/in.h>
 117 #include <netinet/in_systm.h>
 118 #include <netinet/in_var.h>
 119 #include <netinet/ip.h>
 120 #include <netinet/ip_var.h>
 121 #ifdef INET6
 122 #include <netinet/ip6.h>
 123 #include <netinet6/ip6_var.h>
 124 #include <netinet6/in6_ifattach.h>
 125 #endif
 126 #if defined(INET) || defined(INET6)
 127 #include <netinet/ip_carp.h>
 128 #endif
 129 #include <machine/in_cksum.h>
 130 #include <netinet/if_ether.h>
 131 #include <net/bridgestp.h>
 132 #include <net/if_bridgevar.h>
 133 #include <net/if_llc.h>
 134 #include <net/if_vlan_var.h>
 135
 136 #include <net/route.h>
 137
 138 #ifdef INET6
 139 /*
 140  * XXX: declare here to avoid to include many inet6 related files..
 141  * should be more generalized?
 142  */
 143 extern void     nd6_setmtu(struct ifnet *);
 144 #endif
 145
 146 /*
 147  * Size of the route hash table.  Must be a power of two.
 148  */
 149 #ifndef BRIDGE_RTHASH_SIZE
 150 #define BRIDGE_RTHASH_SIZE              1024
 151 #endif
 152
 153 #define BRIDGE_RTHASH_MASK              (BRIDGE_RTHASH_SIZE - 1)
 154
 155 /*
 156  * Default maximum number of addresses to cache.
 157  */
 158 #ifndef BRIDGE_RTABLE_MAX
 159 #define BRIDGE_RTABLE_MAX               2000
 160 #endif
 161
 162 /*
 163  * Timeout (in seconds) for entries learned dynamically.
 164  */
 165 #ifndef BRIDGE_RTABLE_TIMEOUT
 166 #define BRIDGE_RTABLE_TIMEOUT           (20 * 60)       /* same as ARP */
 167 #endif
 168
 169 /*
 170  * Number of seconds between walks of the route list.
 171  */
 172 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
 173 #define BRIDGE_RTABLE_PRUNE_PERIOD      (5 * 60)
 174 #endif
 175
 176 /*
 177  * List of capabilities to possibly mask on the member interface.
 178  */
 179 #define BRIDGE_IFCAPS_MASK              (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\
 180                                          IFCAP_TXCSUM_IPV6)
 181
 182 /*
 183  * List of capabilities to strip
 184  */
 185 #define BRIDGE_IFCAPS_STRIP             IFCAP_LRO
 186
 187 /*
 188  * Bridge locking
 189  *
 190  * The bridge relies heavily on the epoch(9) system to protect its data
 191  * structures. This means we can safely use CK_LISTs while in NET_EPOCH, but we
 192  * must ensure there is only one writer at a time.
 193  *
 194  * That is: for read accesses we only need to be in NET_EPOCH, but for write
 195  * accesses we must hold:
 196  *
 197  *  - BRIDGE_RT_LOCK, for any change to bridge_rtnodes
 198  *  - BRIDGE_LOCK, for any other change
 199  *
 200  * The BRIDGE_LOCK is a sleepable lock, because it is held across ioctl()
 201  * calls to bridge member interfaces and these ioctl()s can sleep.
 202  * The BRIDGE_RT_LOCK is a non-sleepable mutex, because it is sometimes
 203  * required while we're in NET_EPOCH and then we're not allowed to sleep.
 204  */
 205 #define BRIDGE_LOCK_INIT(_sc)           do {                    \
 206         sx_init(&(_sc)->sc_sx, "if_bridge");                    \
 207         mtx_init(&(_sc)->sc_rt_mtx, "if_bridge rt", NULL, MTX_DEF);     \
 208 } while (0)
 209 #define BRIDGE_LOCK_DESTROY(_sc)        do {    \
 210         sx_destroy(&(_sc)->sc_sx);              \
 211         mtx_destroy(&(_sc)->sc_rt_mtx);         \
 212 } while (0)
 213 #define BRIDGE_LOCK(_sc)                sx_xlock(&(_sc)->sc_sx)
 214 #define BRIDGE_UNLOCK(_sc)              sx_xunlock(&(_sc)->sc_sx)
 215 #define BRIDGE_LOCK_ASSERT(_sc)         sx_assert(&(_sc)->sc_sx, SX_XLOCKED)
 216 #define BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(_sc)    \
 217             MPASS(in_epoch(net_epoch_preempt) || sx_xlocked(&(_sc)->sc_sx))
 218 #define BRIDGE_UNLOCK_ASSERT(_sc)       sx_assert(&(_sc)->sc_sx, SX_UNLOCKED)
 219 #define BRIDGE_RT_LOCK(_sc)             mtx_lock(&(_sc)->sc_rt_mtx)
 220 #define BRIDGE_RT_UNLOCK(_sc)           mtx_unlock(&(_sc)->sc_rt_mtx)
 221 #define BRIDGE_RT_LOCK_ASSERT(_sc)      mtx_assert(&(_sc)->sc_rt_mtx, MA_OWNED)
 222 #define BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(_sc) \
 223             MPASS(in_epoch(net_epoch_preempt) || mtx_owned(&(_sc)->sc_rt_mtx))
 224
 225 /*
 226  * Bridge interface list entry.
 227  */
 228 struct bridge_iflist {
 229         CK_LIST_ENTRY(bridge_iflist) bif_next;
 230         struct ifnet            *bif_ifp;       /* member if */
 231         struct bstp_port        bif_stp;        /* STP state */
 232         uint32_t                bif_flags;      /* member if flags */
 233         int                     bif_savedcaps;  /* saved capabilities */
 234         uint32_t                bif_addrmax;    /* max # of addresses */
 235         uint32_t                bif_addrcnt;    /* cur. # of addresses */
 236         uint32_t                bif_addrexceeded;/* # of address violations */
 237         struct epoch_context    bif_epoch_ctx;
 238 };
 239
 240 /*
 241  * Bridge route node.
 242  */
 243 struct bridge_rtnode {
 244         CK_LIST_ENTRY(bridge_rtnode) brt_hash;  /* hash table linkage */
 245         CK_LIST_ENTRY(bridge_rtnode) brt_list;  /* list linkage */
 246         struct bridge_iflist    *brt_dst;       /* destination if */
 247         unsigned long           brt_expire;     /* expiration time */
 248         uint8_t                 brt_flags;      /* address flags */
 249         uint8_t                 brt_addr[ETHER_ADDR_LEN];
 250         uint16_t                brt_vlan;       /* vlan id */
 251         struct  vnet            *brt_vnet;
 252         struct  epoch_context   brt_epoch_ctx;
 253 };
 254 #define brt_ifp                 brt_dst->bif_ifp
 255
 256 /*
 257  * Software state for each bridge.
 258  */
 259 struct bridge_softc {
 260         struct ifnet            *sc_ifp;        /* make this an interface */
 261         LIST_ENTRY(bridge_softc) sc_list;
 262         struct sx               sc_sx;
 263         struct mtx              sc_rt_mtx;
 264         uint32_t                sc_brtmax;      /* max # of addresses */
 265         uint32_t                sc_brtcnt;      /* cur. # of addresses */
 266         uint32_t                sc_brttimeout;  /* rt timeout in seconds */
 267         struct callout          sc_brcallout;   /* bridge callout */
 268         CK_LIST_HEAD(, bridge_iflist) sc_iflist;        /* member interface list */
 269         CK_LIST_HEAD(, bridge_rtnode) *sc_rthash;       /* our forwarding table */
 270         CK_LIST_HEAD(, bridge_rtnode) sc_rtlist;        /* list version of above */
 271         uint32_t                sc_rthash_key;  /* key for hash */
 272         CK_LIST_HEAD(, bridge_iflist) sc_spanlist;      /* span ports list */
 273         struct bstp_state       sc_stp;         /* STP state */
 274         uint32_t                sc_brtexceeded; /* # of cache drops */
 275         struct ifnet            *sc_ifaddr;     /* member mac copied from */
 276         struct ether_addr       sc_defaddr;     /* Default MAC address */
 277         struct epoch_context    sc_epoch_ctx;
 278 };
 279
 280 VNET_DEFINE_STATIC(struct sx, bridge_list_sx);
 281 #define V_bridge_list_sx        VNET(bridge_list_sx)
 282 static eventhandler_tag bridge_detach_cookie;
 283
 284 int     bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
 285
 286 VNET_DEFINE_STATIC(uma_zone_t, bridge_rtnode_zone);
 287 #define V_bridge_rtnode_zone    VNET(bridge_rtnode_zone)
 288
 289 static int      bridge_clone_create(struct if_clone *, int, caddr_t);
 290 static void     bridge_clone_destroy(struct ifnet *);
 291
 292 static int      bridge_ioctl(struct ifnet *, u_long, caddr_t);
 293 static void     bridge_mutecaps(struct bridge_softc *);
 294 static void     bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
 295                     int);
 296 static void     bridge_ifdetach(void *arg __unused, struct ifnet *);
 297 static void     bridge_init(void *);
 298 static void     bridge_dummynet(struct mbuf *, struct ifnet *);
 299 static void     bridge_stop(struct ifnet *, int);
 300 static int      bridge_transmit(struct ifnet *, struct mbuf *);
 301 #ifdef ALTQ
 302 static void     bridge_altq_start(if_t);
 303 static int      bridge_altq_transmit(if_t, struct mbuf *);
 304 #endif
 305 static void     bridge_qflush(struct ifnet *);
 306 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
 307 static int      bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
 308                     struct rtentry *);
 309 static int      bridge_enqueue(struct bridge_softc *, struct ifnet *,
 310                     struct mbuf *);
 311 static void     bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
 312
 313 static void     bridge_forward(struct bridge_softc *, struct bridge_iflist *,
 314                     struct mbuf *m);
 315
 316 static void     bridge_timer(void *);
 317
 318 static void     bridge_broadcast(struct bridge_softc *, struct ifnet *,
 319                     struct mbuf *, int);
 320 static void     bridge_span(struct bridge_softc *, struct mbuf *);
 321
 322 static int      bridge_rtupdate(struct bridge_softc *, const uint8_t *,
 323                     uint16_t, struct bridge_iflist *, int, uint8_t);
 324 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
 325                     uint16_t);
 326 static void     bridge_rttrim(struct bridge_softc *);
 327 static void     bridge_rtage(struct bridge_softc *);
 328 static void     bridge_rtflush(struct bridge_softc *, int);
 329 static int      bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
 330                     uint16_t);
 331
 332 static void     bridge_rtable_init(struct bridge_softc *);
 333 static void     bridge_rtable_fini(struct bridge_softc *);
 334
 335 static int      bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
 336 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
 337                     const uint8_t *, uint16_t);
 338 static int      bridge_rtnode_insert(struct bridge_softc *,
 339                     struct bridge_rtnode *);
 340 static void     bridge_rtnode_destroy(struct bridge_softc *,
 341                     struct bridge_rtnode *);
 342 static void     bridge_rtable_expire(struct ifnet *, int);
 343 static void     bridge_state_change(struct ifnet *, int);
 344
 345 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
 346                     const char *name);
 347 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
 348                     struct ifnet *ifp);
 349 static void     bridge_delete_member(struct bridge_softc *,
 350                     struct bridge_iflist *, int);
 351 static void     bridge_delete_span(struct bridge_softc *,
 352                     struct bridge_iflist *);
 353
 354 static int      bridge_ioctl_add(struct bridge_softc *, void *);
 355 static int      bridge_ioctl_del(struct bridge_softc *, void *);
 356 static int      bridge_ioctl_gifflags(struct bridge_softc *, void *);
 357 static int      bridge_ioctl_sifflags(struct bridge_softc *, void *);
 358 static int      bridge_ioctl_scache(struct bridge_softc *, void *);
 359 static int      bridge_ioctl_gcache(struct bridge_softc *, void *);
 360 static int      bridge_ioctl_gifs(struct bridge_softc *, void *);
 361 static int      bridge_ioctl_rts(struct bridge_softc *, void *);
 362 static int      bridge_ioctl_saddr(struct bridge_softc *, void *);
 363 static int      bridge_ioctl_sto(struct bridge_softc *, void *);
 364 static int      bridge_ioctl_gto(struct bridge_softc *, void *);
 365 static int      bridge_ioctl_daddr(struct bridge_softc *, void *);
 366 static int      bridge_ioctl_flush(struct bridge_softc *, void *);
 367 static int      bridge_ioctl_gpri(struct bridge_softc *, void *);
 368 static int      bridge_ioctl_spri(struct bridge_softc *, void *);
 369 static int      bridge_ioctl_ght(struct bridge_softc *, void *);
 370 static int      bridge_ioctl_sht(struct bridge_softc *, void *);
 371 static int      bridge_ioctl_gfd(struct bridge_softc *, void *);
 372 static int      bridge_ioctl_sfd(struct bridge_softc *, void *);
 373 static int      bridge_ioctl_gma(struct bridge_softc *, void *);
 374 static int      bridge_ioctl_sma(struct bridge_softc *, void *);
 375 static int      bridge_ioctl_sifprio(struct bridge_softc *, void *);
 376 static int      bridge_ioctl_sifcost(struct bridge_softc *, void *);
 377 static int      bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
 378 static int      bridge_ioctl_addspan(struct bridge_softc *, void *);
 379 static int      bridge_ioctl_delspan(struct bridge_softc *, void *);
 380 static int      bridge_ioctl_gbparam(struct bridge_softc *, void *);
 381 static int      bridge_ioctl_grte(struct bridge_softc *, void *);
 382 static int      bridge_ioctl_gifsstp(struct bridge_softc *, void *);
 383 static int      bridge_ioctl_sproto(struct bridge_softc *, void *);
 384 static int      bridge_ioctl_stxhc(struct bridge_softc *, void *);
 385 static int      bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
 386                     int);
 387 static int      bridge_ip_checkbasic(struct mbuf **mp);
 388 #ifdef INET6
 389 static int      bridge_ip6_checkbasic(struct mbuf **mp);
 390 #endif /* INET6 */
 391 static int      bridge_fragment(struct ifnet *, struct mbuf **mp,
 392                     struct ether_header *, int, struct llc *);
 393 static void     bridge_linkstate(struct ifnet *ifp);
 394 static void     bridge_linkcheck(struct bridge_softc *sc);
 395
 396 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
 397 #define VLANTAGOF(_m)   \
 398     (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
 399
 400 static struct bstp_cb_ops bridge_ops = {
 401         .bcb_state = bridge_state_change,
 402         .bcb_rtage = bridge_rtable_expire
 403 };
 404
 405 SYSCTL_DECL(_net_link);
 406 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
 407     "Bridge");
 408
 409 /* only pass IP[46] packets when pfil is enabled */
 410 VNET_DEFINE_STATIC(int, pfil_onlyip) = 1;
 411 #define V_pfil_onlyip   VNET(pfil_onlyip)
 412 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip,
 413     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0,
 414     "Only pass IP packets when pfil is enabled");
 415
 416 /* run pfil hooks on the bridge interface */
 417 VNET_DEFINE_STATIC(int, pfil_bridge) = 1;
 418 #define V_pfil_bridge   VNET(pfil_bridge)
 419 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge,
 420     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0,
 421     "Packet filter on the bridge interface");
 422
 423 /* layer2 filter with ipfw */
 424 VNET_DEFINE_STATIC(int, pfil_ipfw);
 425 #define V_pfil_ipfw     VNET(pfil_ipfw)
 426
 427 /* layer2 ARP filter with ipfw */
 428 VNET_DEFINE_STATIC(int, pfil_ipfw_arp);
 429 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp)
 430 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp,
 431     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0,
 432     "Filter ARP packets through IPFW layer2");
 433
 434 /* run pfil hooks on the member interface */
 435 VNET_DEFINE_STATIC(int, pfil_member) = 1;
 436 #define V_pfil_member   VNET(pfil_member)
 437 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member,
 438     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0,
 439     "Packet filter on the member interface");
 440
 441 /* run pfil hooks on the physical interface for locally destined packets */
 442 VNET_DEFINE_STATIC(int, pfil_local_phys);
 443 #define V_pfil_local_phys       VNET(pfil_local_phys)
 444 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys,
 445     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0,
 446     "Packet filter on the physical interface for locally destined packets");
 447
 448 /* log STP state changes */
 449 VNET_DEFINE_STATIC(int, log_stp);
 450 #define V_log_stp       VNET(log_stp)
 451 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp,
 452     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0,
 453     "Log STP state changes");
 454
 455 /* share MAC with first bridge member */
 456 VNET_DEFINE_STATIC(int, bridge_inherit_mac);
 457 #define V_bridge_inherit_mac    VNET(bridge_inherit_mac)
 458 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac,
 459     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0,
 460     "Inherit MAC address from the first bridge member");
 461
 462 VNET_DEFINE_STATIC(int, allow_llz_overlap) = 0;
 463 #define V_allow_llz_overlap     VNET(allow_llz_overlap)
 464 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap,
 465     CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0,
 466     "Allow overlap of link-local scope "
 467     "zones of a bridge interface and the member interfaces");
 468
 469 struct bridge_control {
 470         int     (*bc_func)(struct bridge_softc *, void *);
 471         int     bc_argsize;
 472         int     bc_flags;
 473 };
 474
 475 #define BC_F_COPYIN             0x01    /* copy arguments in */
 476 #define BC_F_COPYOUT            0x02    /* copy arguments out */
 477 #define BC_F_SUSER              0x04    /* do super-user check */
 478
 479 const struct bridge_control bridge_control_table[] = {
 480         { bridge_ioctl_add,             sizeof(struct ifbreq),
 481           BC_F_COPYIN|BC_F_SUSER },
 482         { bridge_ioctl_del,             sizeof(struct ifbreq),
 483           BC_F_COPYIN|BC_F_SUSER },
 484
 485         { bridge_ioctl_gifflags,        sizeof(struct ifbreq),
 486           BC_F_COPYIN|BC_F_COPYOUT },
 487         { bridge_ioctl_sifflags,        sizeof(struct ifbreq),
 488           BC_F_COPYIN|BC_F_SUSER },
 489
 490         { bridge_ioctl_scache,          sizeof(struct ifbrparam),
 491           BC_F_COPYIN|BC_F_SUSER },
 492         { bridge_ioctl_gcache,          sizeof(struct ifbrparam),
 493           BC_F_COPYOUT },
 494
 495         { bridge_ioctl_gifs,            sizeof(struct ifbifconf),
 496           BC_F_COPYIN|BC_F_COPYOUT },
 497         { bridge_ioctl_rts,             sizeof(struct ifbaconf),
 498           BC_F_COPYIN|BC_F_COPYOUT },
 499
 500         { bridge_ioctl_saddr,           sizeof(struct ifbareq),
 501           BC_F_COPYIN|BC_F_SUSER },
 502
 503         { bridge_ioctl_sto,             sizeof(struct ifbrparam),
 504           BC_F_COPYIN|BC_F_SUSER },
 505         { bridge_ioctl_gto,             sizeof(struct ifbrparam),
 506           BC_F_COPYOUT },
 507
 508         { bridge_ioctl_daddr,           sizeof(struct ifbareq),
 509           BC_F_COPYIN|BC_F_SUSER },
 510
 511         { bridge_ioctl_flush,           sizeof(struct ifbreq),
 512           BC_F_COPYIN|BC_F_SUSER },
 513
 514         { bridge_ioctl_gpri,            sizeof(struct ifbrparam),
 515           BC_F_COPYOUT },
 516         { bridge_ioctl_spri,            sizeof(struct ifbrparam),
 517           BC_F_COPYIN|BC_F_SUSER },
 518
 519         { bridge_ioctl_ght,             sizeof(struct ifbrparam),
 520           BC_F_COPYOUT },
 521         { bridge_ioctl_sht,             sizeof(struct ifbrparam),
 522           BC_F_COPYIN|BC_F_SUSER },
 523
 524         { bridge_ioctl_gfd,             sizeof(struct ifbrparam),
 525           BC_F_COPYOUT },
 526         { bridge_ioctl_sfd,             sizeof(struct ifbrparam),
 527           BC_F_COPYIN|BC_F_SUSER },
 528
 529         { bridge_ioctl_gma,             sizeof(struct ifbrparam),
 530           BC_F_COPYOUT },
 531         { bridge_ioctl_sma,             sizeof(struct ifbrparam),
 532           BC_F_COPYIN|BC_F_SUSER },
 533
 534         { bridge_ioctl_sifprio,         sizeof(struct ifbreq),
 535           BC_F_COPYIN|BC_F_SUSER },
 536
 537         { bridge_ioctl_sifcost,         sizeof(struct ifbreq),
 538           BC_F_COPYIN|BC_F_SUSER },
 539
 540         { bridge_ioctl_addspan,         sizeof(struct ifbreq),
 541           BC_F_COPYIN|BC_F_SUSER },
 542         { bridge_ioctl_delspan,         sizeof(struct ifbreq),
 543           BC_F_COPYIN|BC_F_SUSER },
 544
 545         { bridge_ioctl_gbparam,         sizeof(struct ifbropreq),
 546           BC_F_COPYOUT },
 547
 548         { bridge_ioctl_grte,            sizeof(struct ifbrparam),
 549           BC_F_COPYOUT },
 550
 551         { bridge_ioctl_gifsstp,         sizeof(struct ifbpstpconf),
 552           BC_F_COPYIN|BC_F_COPYOUT },
 553
 554         { bridge_ioctl_sproto,          sizeof(struct ifbrparam),
 555           BC_F_COPYIN|BC_F_SUSER },
 556
 557         { bridge_ioctl_stxhc,           sizeof(struct ifbrparam),
 558           BC_F_COPYIN|BC_F_SUSER },
 559
 560         { bridge_ioctl_sifmaxaddr,      sizeof(struct ifbreq),
 561           BC_F_COPYIN|BC_F_SUSER },
 562
 563 };
 564 const int bridge_control_table_size = nitems(bridge_control_table);
 565
 566 VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list);
 567 #define V_bridge_list   VNET(bridge_list)
 568 #define BRIDGE_LIST_LOCK_INIT(x)        sx_init(&V_bridge_list_sx,      \
 569                                             "if_bridge list")
 570 #define BRIDGE_LIST_LOCK_DESTROY(x)     sx_destroy(&V_bridge_list_sx)
 571 #define BRIDGE_LIST_LOCK(x)             sx_xlock(&V_bridge_list_sx)
 572 #define BRIDGE_LIST_UNLOCK(x)           sx_xunlock(&V_bridge_list_sx)
 573
 574 VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner);
 575 #define V_bridge_cloner VNET(bridge_cloner)
 576
 577 static const char bridge_name[] = "bridge";
 578
 579 static void
 580 vnet_bridge_init(const void *unused __unused)
 581 {
 582
 583         V_bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
 584             sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
 585             UMA_ALIGN_PTR, 0);
 586         BRIDGE_LIST_LOCK_INIT();
 587         LIST_INIT(&V_bridge_list);
 588         V_bridge_cloner = if_clone_simple(bridge_name,
 589             bridge_clone_create, bridge_clone_destroy, 0);
 590 }
 591 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
 592     vnet_bridge_init, NULL);
 593
 594 static void
 595 vnet_bridge_uninit(const void *unused __unused)
 596 {
 597
 598         if_clone_detach(V_bridge_cloner);
 599         V_bridge_cloner = NULL;
 600         BRIDGE_LIST_LOCK_DESTROY();
 601
 602         /* Callbacks may use the UMA zone. */
 603         epoch_drain_callbacks(net_epoch_preempt);
 604
 605         uma_zdestroy(V_bridge_rtnode_zone);
 606 }
 607 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
 608     vnet_bridge_uninit, NULL);
 609
 610 static int
 611 bridge_modevent(module_t mod, int type, void *data)
 612 {
 613
 614         switch (type) {
 615         case MOD_LOAD:
 616                 bridge_dn_p = bridge_dummynet;
 617                 bridge_detach_cookie = EVENTHANDLER_REGISTER(
 618                     ifnet_departure_event, bridge_ifdetach, NULL,
 619                     EVENTHANDLER_PRI_ANY);
 620                 break;
 621         case MOD_UNLOAD:
 622                 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
 623                     bridge_detach_cookie);
 624                 bridge_dn_p = NULL;
 625                 break;
 626         default:
 627                 return (EOPNOTSUPP);
 628         }
 629         return (0);
 630 }
 631
 632 static moduledata_t bridge_mod = {
 633         "if_bridge",
 634         bridge_modevent,
 635         0
 636 };
 637
 638 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
 639 MODULE_VERSION(if_bridge, 1);
 640 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
 641
 642 /*
 643  * handler for net.link.bridge.ipfw
 644  */
 645 static int
 646 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
 647 {
 648         int enable = V_pfil_ipfw;
 649         int error;
 650
 651         error = sysctl_handle_int(oidp, &enable, 0, req);
 652         enable &= 1;
 653
 654         if (enable != V_pfil_ipfw) {
 655                 V_pfil_ipfw = enable;
 656
 657                 /*
 658                  * Disable pfil so that ipfw doesnt run twice, if the user
 659                  * really wants both then they can re-enable pfil_bridge and/or
 660                  * pfil_member. Also allow non-ip packets as ipfw can filter by
 661                  * layer2 type.
 662                  */
 663                 if (V_pfil_ipfw) {
 664                         V_pfil_onlyip = 0;
 665                         V_pfil_bridge = 0;
 666                         V_pfil_member = 0;
 667                 }
 668         }
 669
 670         return (error);
 671 }
 672 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw,
 673     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET | CTLFLAG_NEEDGIANT,
 674     &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I",
 675     "Layer2 filter with IPFW");
 676
 677 #ifdef VIMAGE
 678 static void
 679 bridge_reassign(struct ifnet *ifp, struct vnet *newvnet, char *arg)
 680 {
 681         struct bridge_softc *sc = ifp->if_softc;
 682         struct bridge_iflist *bif;
 683
 684         BRIDGE_LOCK(sc);
 685
 686         while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL)
 687                 bridge_delete_member(sc, bif, 0);
 688
 689         while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) {
 690                 bridge_delete_span(sc, bif);
 691         }
 692
 693         BRIDGE_UNLOCK(sc);
 694
 695         ether_reassign(ifp, newvnet, arg);
 696 }
 697 #endif
 698
 699 /*
 700  * bridge_clone_create:
 701  *
 702  *      Create a new bridge instance.
 703  */
 704 static int
 705 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
 706 {
 707         struct bridge_softc *sc;
 708         struct ifnet *ifp;
 709
 710         sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
 711         ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
 712         if (ifp == NULL) {
 713                 free(sc, M_DEVBUF);
 714                 return (ENOSPC);
 715         }
 716
 717         BRIDGE_LOCK_INIT(sc);
 718         sc->sc_brtmax = BRIDGE_RTABLE_MAX;
 719         sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
 720
 721         /* Initialize our routing table. */
 722         bridge_rtable_init(sc);
 723
 724         callout_init_mtx(&sc->sc_brcallout, &sc->sc_rt_mtx, 0);
 725
 726         CK_LIST_INIT(&sc->sc_iflist);
 727         CK_LIST_INIT(&sc->sc_spanlist);
 728
 729         ifp->if_softc = sc;
 730         if_initname(ifp, bridge_name, unit);
 731         ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
 732         ifp->if_ioctl = bridge_ioctl;
 733 #ifdef ALTQ
 734         ifp->if_start = bridge_altq_start;
 735         ifp->if_transmit = bridge_altq_transmit;
 736         IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
 737         ifp->if_snd.ifq_drv_maxlen = 0;
 738         IFQ_SET_READY(&ifp->if_snd);
 739 #else
 740         ifp->if_transmit = bridge_transmit;
 741 #endif
 742         ifp->if_qflush = bridge_qflush;
 743         ifp->if_init = bridge_init;
 744         ifp->if_type = IFT_BRIDGE;
 745
 746         ether_gen_addr(ifp, &sc->sc_defaddr);
 747
 748         bstp_attach(&sc->sc_stp, &bridge_ops);
 749         ether_ifattach(ifp, sc->sc_defaddr.octet);
 750         /* Now undo some of the damage... */
 751         ifp->if_baudrate = 0;
 752         ifp->if_type = IFT_BRIDGE;
 753 #ifdef VIMAGE
 754         ifp->if_reassign = bridge_reassign;
 755 #endif
 756
 757         BRIDGE_LIST_LOCK();
 758         LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list);
 759         BRIDGE_LIST_UNLOCK();
 760
 761         return (0);
 762 }
 763
 764 static void
 765 bridge_clone_destroy_cb(struct epoch_context *ctx)
 766 {
 767         struct bridge_softc *sc;
 768
 769         sc = __containerof(ctx, struct bridge_softc, sc_epoch_ctx);
 770
 771         BRIDGE_LOCK_DESTROY(sc);
 772         free(sc, M_DEVBUF);
 773 }
 774
 775 /*
 776  * bridge_clone_destroy:
 777  *
 778  *      Destroy a bridge instance.
 779  */
 780 static void
 781 bridge_clone_destroy(struct ifnet *ifp)
 782 {
 783         struct bridge_softc *sc = ifp->if_softc;
 784         struct bridge_iflist *bif;
 785         struct epoch_tracker et;
 786
 787         BRIDGE_LOCK(sc);
 788
 789         bridge_stop(ifp, 1);
 790         ifp->if_flags &= ~IFF_UP;
 791
 792         while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL)
 793                 bridge_delete_member(sc, bif, 0);
 794
 795         while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) {
 796                 bridge_delete_span(sc, bif);
 797         }
 798
 799         /* Tear down the routing table. */
 800         bridge_rtable_fini(sc);
 801
 802         BRIDGE_UNLOCK(sc);
 803
 804         NET_EPOCH_ENTER(et);
 805
 806         callout_drain(&sc->sc_brcallout);
 807
 808         BRIDGE_LIST_LOCK();
 809         LIST_REMOVE(sc, sc_list);
 810         BRIDGE_LIST_UNLOCK();
 811
 812         bstp_detach(&sc->sc_stp);
 813 #ifdef ALTQ
 814         IFQ_PURGE(&ifp->if_snd);
 815 #endif
 816         NET_EPOCH_EXIT(et);
 817
 818         ether_ifdetach(ifp);
 819         if_free(ifp);
 820
 821         NET_EPOCH_CALL(bridge_clone_destroy_cb, &sc->sc_epoch_ctx);
 822 }
 823
 824 /*
 825  * bridge_ioctl:
 826  *
 827  *      Handle a control request from the operator.
 828  */
 829 static int
 830 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
 831 {
 832         struct bridge_softc *sc = ifp->if_softc;
 833         struct ifreq *ifr = (struct ifreq *)data;
 834         struct bridge_iflist *bif;
 835         struct thread *td = curthread;
 836         union {
 837                 struct ifbreq ifbreq;
 838                 struct ifbifconf ifbifconf;
 839                 struct ifbareq ifbareq;
 840                 struct ifbaconf ifbaconf;
 841                 struct ifbrparam ifbrparam;
 842                 struct ifbropreq ifbropreq;
 843         } args;
 844         struct ifdrv *ifd = (struct ifdrv *) data;
 845         const struct bridge_control *bc;
 846         int error = 0, oldmtu;
 847
 848         BRIDGE_LOCK(sc);
 849
 850         switch (cmd) {
 851         case SIOCADDMULTI:
 852         case SIOCDELMULTI:
 853                 break;
 854
 855         case SIOCGDRVSPEC:
 856         case SIOCSDRVSPEC:
 857                 if (ifd->ifd_cmd >= bridge_control_table_size) {
 858                         error = EINVAL;
 859                         break;
 860                 }
 861                 bc = &bridge_control_table[ifd->ifd_cmd];
 862
 863                 if (cmd == SIOCGDRVSPEC &&
 864                     (bc->bc_flags & BC_F_COPYOUT) == 0) {
 865                         error = EINVAL;
 866                         break;
 867                 }
 868                 else if (cmd == SIOCSDRVSPEC &&
 869                     (bc->bc_flags & BC_F_COPYOUT) != 0) {
 870                         error = EINVAL;
 871                         break;
 872                 }
 873
 874                 if (bc->bc_flags & BC_F_SUSER) {
 875                         error = priv_check(td, PRIV_NET_BRIDGE);
 876                         if (error)
 877                                 break;
 878                 }
 879
 880                 if (ifd->ifd_len != bc->bc_argsize ||
 881                     ifd->ifd_len > sizeof(args)) {
 882                         error = EINVAL;
 883                         break;
 884                 }
 885
 886                 bzero(&args, sizeof(args));
 887                 if (bc->bc_flags & BC_F_COPYIN) {
 888                         error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
 889                         if (error)
 890                                 break;
 891                 }
 892
 893                 oldmtu = ifp->if_mtu;
 894                 error = (*bc->bc_func)(sc, &args);
 895                 if (error)
 896                         break;
 897
 898                 /*
 899                  * Bridge MTU may change during addition of the first port.
 900                  * If it did, do network layer specific procedure.
 901                  */
 902                 if (ifp->if_mtu != oldmtu) {
 903 #ifdef INET6
 904                         nd6_setmtu(ifp);
 905 #endif
 906                         rt_updatemtu(ifp);
 907                 }
 908
 909                 if (bc->bc_flags & BC_F_COPYOUT)
 910                         error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
 911
 912                 break;
 913
 914         case SIOCSIFFLAGS:
 915                 if (!(ifp->if_flags & IFF_UP) &&
 916                     (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 917                         /*
 918                          * If interface is marked down and it is running,
 919                          * then stop and disable it.
 920                          */
 921                         bridge_stop(ifp, 1);
 922                 } else if ((ifp->if_flags & IFF_UP) &&
 923                     !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 924                         /*
 925                          * If interface is marked up and it is stopped, then
 926                          * start it.
 927                          */
 928                         BRIDGE_UNLOCK(sc);
 929                         (*ifp->if_init)(sc);
 930                         BRIDGE_LOCK(sc);
 931                 }
 932                 break;
 933
 934         case SIOCSIFMTU:
 935                 oldmtu = sc->sc_ifp->if_mtu;
 936
 937                 if (ifr->ifr_mtu < 576) {
 938                         error = EINVAL;
 939                         break;
 940                 }
 941                 if (CK_LIST_EMPTY(&sc->sc_iflist)) {
 942                         sc->sc_ifp->if_mtu = ifr->ifr_mtu;
 943                         break;
 944                 }
 945                 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 946                         error = (*bif->bif_ifp->if_ioctl)(bif->bif_ifp,
 947                             SIOCSIFMTU, (caddr_t)ifr);
 948                         if (error != 0) {
 949                                 log(LOG_NOTICE, "%s: invalid MTU: %u for"
 950                                     " member %s\n", sc->sc_ifp->if_xname,
 951                                     ifr->ifr_mtu,
 952                                     bif->bif_ifp->if_xname);
 953                                 error = EINVAL;
 954                                 break;
 955                         }
 956                 }
 957                 if (error) {
 958                         /* Restore the previous MTU on all member interfaces. */
 959                         ifr->ifr_mtu = oldmtu;
 960                         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 961                                 (*bif->bif_ifp->if_ioctl)(bif->bif_ifp,
 962                                     SIOCSIFMTU, (caddr_t)ifr);
 963                         }
 964                 } else {
 965                         sc->sc_ifp->if_mtu = ifr->ifr_mtu;
 966                 }
 967                 break;
 968         default:
 969                 /*
 970                  * drop the lock as ether_ioctl() will call bridge_start() and
 971                  * cause the lock to be recursed.
 972                  */
 973                 BRIDGE_UNLOCK(sc);
 974                 error = ether_ioctl(ifp, cmd, data);
 975                 BRIDGE_LOCK(sc);
 976                 break;
 977         }
 978
 979         BRIDGE_UNLOCK(sc);
 980
 981         return (error);
 982 }
 983
 984 /*
 985  * bridge_mutecaps:
 986  *
 987  *      Clear or restore unwanted capabilities on the member interface
 988  */
 989 static void
 990 bridge_mutecaps(struct bridge_softc *sc)
 991 {
 992         struct bridge_iflist *bif;
 993         int enabled, mask;
 994
 995         BRIDGE_LOCK_ASSERT(sc);
 996
 997         /* Initial bitmask of capabilities to test */
 998         mask = BRIDGE_IFCAPS_MASK;
 999
1000         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1001                 /* Every member must support it or its disabled */
1002                 mask &= bif->bif_savedcaps;
1003         }
1004
1005         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1006                 enabled = bif->bif_ifp->if_capenable;
1007                 enabled &= ~BRIDGE_IFCAPS_STRIP;
1008                 /* strip off mask bits and enable them again if allowed */
1009                 enabled &= ~BRIDGE_IFCAPS_MASK;
1010                 enabled |= mask;
1011                 bridge_set_ifcap(sc, bif, enabled);
1012         }
1013 }
1014
1015 static void
1016 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
1017 {
1018         struct ifnet *ifp = bif->bif_ifp;
1019         struct ifreq ifr;
1020         int error, mask, stuck;
1021
1022         bzero(&ifr, sizeof(ifr));
1023         ifr.ifr_reqcap = set;
1024
1025         if (ifp->if_capenable != set) {
1026                 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
1027                 if (error)
1028                         if_printf(sc->sc_ifp,
1029                             "error setting capabilities on %s: %d\n",
1030                             ifp->if_xname, error);
1031                 mask = BRIDGE_IFCAPS_MASK | BRIDGE_IFCAPS_STRIP;
1032                 stuck = ifp->if_capenable & mask & ~set;
1033                 if (stuck != 0)
1034                         if_printf(sc->sc_ifp,
1035                             "can't disable some capabilities on %s: 0x%x\n",
1036                             ifp->if_xname, stuck);
1037         }
1038 }
1039
1040 /*
1041  * bridge_lookup_member:
1042  *
1043  *      Lookup a bridge member interface.
1044  */
1045 static struct bridge_iflist *
1046 bridge_lookup_member(struct bridge_softc *sc, const char *name)
1047 {
1048         struct bridge_iflist *bif;
1049         struct ifnet *ifp;
1050
1051         BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
1052
1053         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1054                 ifp = bif->bif_ifp;
1055                 if (strcmp(ifp->if_xname, name) == 0)
1056                         return (bif);
1057         }
1058
1059         return (NULL);
1060 }
1061
1062 /*
1063  * bridge_lookup_member_if:
1064  *
1065  *      Lookup a bridge member interface by ifnet*.
1066  */
1067 static struct bridge_iflist *
1068 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
1069 {
1070         struct bridge_iflist *bif;
1071
1072         BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
1073
1074         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1075                 if (bif->bif_ifp == member_ifp)
1076                         return (bif);
1077         }
1078
1079         return (NULL);
1080 }
1081
1082 static void
1083 bridge_delete_member_cb(struct epoch_context *ctx)
1084 {
1085         struct bridge_iflist *bif;
1086
1087         bif = __containerof(ctx, struct bridge_iflist, bif_epoch_ctx);
1088
1089         free(bif, M_DEVBUF);
1090 }
1091
1092 /*
1093  * bridge_delete_member:
1094  *
1095  *      Delete the specified member interface.
1096  */
1097 static void
1098 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
1099     int gone)
1100 {
1101         struct ifnet *ifs = bif->bif_ifp;
1102         struct ifnet *fif = NULL;
1103         struct bridge_iflist *bifl;
1104
1105         BRIDGE_LOCK_ASSERT(sc);
1106
1107         if (bif->bif_flags & IFBIF_STP)
1108                 bstp_disable(&bif->bif_stp);
1109
1110         ifs->if_bridge = NULL;
1111         CK_LIST_REMOVE(bif, bif_next);
1112
1113         /*
1114          * If removing the interface that gave the bridge its mac address, set
1115          * the mac address of the bridge to the address of the next member, or
1116          * to its default address if no members are left.
1117          */
1118         if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) {
1119                 if (CK_LIST_EMPTY(&sc->sc_iflist)) {
1120                         bcopy(&sc->sc_defaddr,
1121                             IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1122                         sc->sc_ifaddr = NULL;
1123                 } else {
1124                         bifl = CK_LIST_FIRST(&sc->sc_iflist);
1125                         fif = bifl->bif_ifp;
1126                         bcopy(IF_LLADDR(fif),
1127                             IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1128                         sc->sc_ifaddr = fif;
1129                 }
1130                 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1131         }
1132
1133         bridge_linkcheck(sc);
1134         bridge_mutecaps(sc);    /* recalcuate now this interface is removed */
1135         BRIDGE_RT_LOCK(sc);
1136         bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
1137         BRIDGE_RT_UNLOCK(sc);
1138         KASSERT(bif->bif_addrcnt == 0,
1139             ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
1140
1141         ifs->if_bridge_output = NULL;
1142         ifs->if_bridge_input = NULL;
1143         ifs->if_bridge_linkstate = NULL;
1144         if (!gone) {
1145                 switch (ifs->if_type) {
1146                 case IFT_ETHER:
1147                 case IFT_L2VLAN:
1148                         /*
1149                          * Take the interface out of promiscuous mode, but only
1150                          * if it was promiscuous in the first place. It might
1151                          * not be if we're in the bridge_ioctl_add() error path.
1152                          */
1153                         if (ifs->if_flags & IFF_PROMISC)
1154                                 (void) ifpromisc(ifs, 0);
1155                         break;
1156
1157                 case IFT_GIF:
1158                         break;
1159
1160                 default:
1161 #ifdef DIAGNOSTIC
1162                         panic("bridge_delete_member: impossible");
1163 #endif
1164                         break;
1165                 }
1166                 /* reneable any interface capabilities */
1167                 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
1168         }
1169         bstp_destroy(&bif->bif_stp);    /* prepare to free */
1170
1171         NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx);
1172 }
1173
1174 /*
1175  * bridge_delete_span:
1176  *
1177  *      Delete the specified span interface.
1178  */
1179 static void
1180 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1181 {
1182         BRIDGE_LOCK_ASSERT(sc);
1183
1184         KASSERT(bif->bif_ifp->if_bridge == NULL,
1185             ("%s: not a span interface", __func__));
1186
1187         CK_LIST_REMOVE(bif, bif_next);
1188
1189         NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx);
1190 }
1191
1192 static int
1193 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1194 {
1195         struct ifbreq *req = arg;
1196         struct bridge_iflist *bif = NULL;
1197         struct ifnet *ifs;
1198         int error = 0;
1199
1200         ifs = ifunit(req->ifbr_ifsname);
1201         if (ifs == NULL)
1202                 return (ENOENT);
1203         if (ifs->if_ioctl == NULL)      /* must be supported */
1204                 return (EINVAL);
1205
1206         /* If it's in the span list, it can't be a member. */
1207         CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1208                 if (ifs == bif->bif_ifp)
1209                         return (EBUSY);
1210
1211         if (ifs->if_bridge == sc)
1212                 return (EEXIST);
1213
1214         if (ifs->if_bridge != NULL)
1215                 return (EBUSY);
1216
1217         switch (ifs->if_type) {
1218         case IFT_ETHER:
1219         case IFT_L2VLAN:
1220         case IFT_GIF:
1221                 /* permitted interface types */
1222                 break;
1223         default:
1224                 return (EINVAL);
1225         }
1226
1227 #ifdef INET6
1228         /*
1229          * Two valid inet6 addresses with link-local scope must not be
1230          * on the parent interface and the member interfaces at the
1231          * same time.  This restriction is needed to prevent violation
1232          * of link-local scope zone.  Attempts to add a member
1233          * interface which has inet6 addresses when the parent has
1234          * inet6 triggers removal of all inet6 addresses on the member
1235          * interface.
1236          */
1237
1238         /* Check if the parent interface has a link-local scope addr. */
1239         if (V_allow_llz_overlap == 0 &&
1240             in6ifa_llaonifp(sc->sc_ifp) != NULL) {
1241                 /*
1242                  * If any, remove all inet6 addresses from the member
1243                  * interfaces.
1244                  */
1245                 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1246                         if (in6ifa_llaonifp(bif->bif_ifp)) {
1247                                 in6_ifdetach(bif->bif_ifp);
1248                                 if_printf(sc->sc_ifp,
1249                                     "IPv6 addresses on %s have been removed "
1250                                     "before adding it as a member to prevent "
1251                                     "IPv6 address scope violation.\n",
1252                                     bif->bif_ifp->if_xname);
1253                         }
1254                 }
1255                 if (in6ifa_llaonifp(ifs)) {
1256                         in6_ifdetach(ifs);
1257                         if_printf(sc->sc_ifp,
1258                             "IPv6 addresses on %s have been removed "
1259                             "before adding it as a member to prevent "
1260                             "IPv6 address scope violation.\n",
1261                             ifs->if_xname);
1262                 }
1263         }
1264 #endif
1265         /* Allow the first Ethernet member to define the MTU */
1266         if (CK_LIST_EMPTY(&sc->sc_iflist))
1267                 sc->sc_ifp->if_mtu = ifs->if_mtu;
1268         else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
1269                 struct ifreq ifr;
1270
1271                 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s",
1272                     ifs->if_xname);
1273                 ifr.ifr_mtu = sc->sc_ifp->if_mtu;
1274
1275                 error = (*ifs->if_ioctl)(ifs,
1276                     SIOCSIFMTU, (caddr_t)&ifr);
1277                 if (error != 0) {
1278                         log(LOG_NOTICE, "%s: invalid MTU: %u for"
1279                             " new member %s\n", sc->sc_ifp->if_xname,
1280                             ifr.ifr_mtu,
1281                             ifs->if_xname);
1282                         return (EINVAL);
1283                 }
1284         }
1285
1286         bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1287         if (bif == NULL)
1288                 return (ENOMEM);
1289
1290         bif->bif_ifp = ifs;
1291         bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1292         bif->bif_savedcaps = ifs->if_capenable;
1293
1294         /*
1295          * Assign the interface's MAC address to the bridge if it's the first
1296          * member and the MAC address of the bridge has not been changed from
1297          * the default randomly generated one.
1298          */
1299         if (V_bridge_inherit_mac && CK_LIST_EMPTY(&sc->sc_iflist) &&
1300             !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) {
1301                 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1302                 sc->sc_ifaddr = ifs;
1303                 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1304         }
1305
1306         ifs->if_bridge = sc;
1307         ifs->if_bridge_output = bridge_output;
1308         ifs->if_bridge_input = bridge_input;
1309         ifs->if_bridge_linkstate = bridge_linkstate;
1310         bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1311         /*
1312          * XXX: XLOCK HERE!?!
1313          *
1314          * NOTE: insert_***HEAD*** should be safe for the traversals.
1315          */
1316         CK_LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1317
1318         /* Set interface capabilities to the intersection set of all members */
1319         bridge_mutecaps(sc);
1320         bridge_linkcheck(sc);
1321
1322         /* Place the interface into promiscuous mode */
1323         switch (ifs->if_type) {
1324                 case IFT_ETHER:
1325                 case IFT_L2VLAN:
1326                         error = ifpromisc(ifs, 1);
1327                         break;
1328         }
1329
1330         if (error)
1331                 bridge_delete_member(sc, bif, 0);
1332         return (error);
1333 }
1334
1335 static int
1336 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1337 {
1338         struct ifbreq *req = arg;
1339         struct bridge_iflist *bif;
1340
1341         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1342         if (bif == NULL)
1343                 return (ENOENT);
1344
1345         bridge_delete_member(sc, bif, 0);
1346
1347         return (0);
1348 }
1349
1350 static int
1351 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1352 {
1353         struct ifbreq *req = arg;
1354         struct bridge_iflist *bif;
1355         struct bstp_port *bp;
1356
1357         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1358         if (bif == NULL)
1359                 return (ENOENT);
1360
1361         bp = &bif->bif_stp;
1362         req->ifbr_ifsflags = bif->bif_flags;
1363         req->ifbr_state = bp->bp_state;
1364         req->ifbr_priority = bp->bp_priority;
1365         req->ifbr_path_cost = bp->bp_path_cost;
1366         req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1367         req->ifbr_proto = bp->bp_protover;
1368         req->ifbr_role = bp->bp_role;
1369         req->ifbr_stpflags = bp->bp_flags;
1370         req->ifbr_addrcnt = bif->bif_addrcnt;
1371         req->ifbr_addrmax = bif->bif_addrmax;
1372         req->ifbr_addrexceeded = bif->bif_addrexceeded;
1373
1374         /* Copy STP state options as flags */
1375         if (bp->bp_operedge)
1376                 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1377         if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1378                 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1379         if (bp->bp_ptp_link)
1380                 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1381         if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1382                 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1383         if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1384                 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1385         if (bp->bp_flags & BSTP_PORT_ADMCOST)
1386                 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1387         return (0);
1388 }
1389
1390 static int
1391 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1392 {
1393         struct epoch_tracker et;
1394         struct ifbreq *req = arg;
1395         struct bridge_iflist *bif;
1396         struct bstp_port *bp;
1397         int error;
1398
1399         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1400         if (bif == NULL)
1401                 return (ENOENT);
1402         bp = &bif->bif_stp;
1403
1404         if (req->ifbr_ifsflags & IFBIF_SPAN)
1405                 /* SPAN is readonly */
1406                 return (EINVAL);
1407
1408         NET_EPOCH_ENTER(et);
1409
1410         if (req->ifbr_ifsflags & IFBIF_STP) {
1411                 if ((bif->bif_flags & IFBIF_STP) == 0) {
1412                         error = bstp_enable(&bif->bif_stp);
1413                         if (error) {
1414                                 NET_EPOCH_EXIT(et);
1415                                 return (error);
1416                         }
1417                 }
1418         } else {
1419                 if ((bif->bif_flags & IFBIF_STP) != 0)
1420                         bstp_disable(&bif->bif_stp);
1421         }
1422
1423         /* Pass on STP flags */
1424         bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1425         bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1426         bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1427         bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1428
1429         /* Save the bits relating to the bridge */
1430         bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1431
1432         NET_EPOCH_EXIT(et);
1433
1434         return (0);
1435 }
1436
1437 static int
1438 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1439 {
1440         struct ifbrparam *param = arg;
1441
1442         sc->sc_brtmax = param->ifbrp_csize;
1443         bridge_rttrim(sc);
1444
1445         return (0);
1446 }
1447
1448 static int
1449 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1450 {
1451         struct ifbrparam *param = arg;
1452
1453         param->ifbrp_csize = sc->sc_brtmax;
1454
1455         return (0);
1456 }
1457
1458 static int
1459 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1460 {
1461         struct ifbifconf *bifc = arg;
1462         struct bridge_iflist *bif;
1463         struct ifbreq breq;
1464         char *buf, *outbuf;
1465         int count, buflen, len, error = 0;
1466
1467         count = 0;
1468         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1469                 count++;
1470         CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1471                 count++;
1472
1473         buflen = sizeof(breq) * count;
1474         if (bifc->ifbic_len == 0) {
1475                 bifc->ifbic_len = buflen;
1476                 return (0);
1477         }
1478         outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO);
1479         if (outbuf == NULL)
1480                 return (ENOMEM);
1481
1482         count = 0;
1483         buf = outbuf;
1484         len = min(bifc->ifbic_len, buflen);
1485         bzero(&breq, sizeof(breq));
1486         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1487                 if (len < sizeof(breq))
1488                         break;
1489
1490                 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1491                     sizeof(breq.ifbr_ifsname));
1492                 /* Fill in the ifbreq structure */
1493                 error = bridge_ioctl_gifflags(sc, &breq);
1494                 if (error)
1495                         break;
1496                 memcpy(buf, &breq, sizeof(breq));
1497                 count++;
1498                 buf += sizeof(breq);
1499                 len -= sizeof(breq);
1500         }
1501         CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1502                 if (len < sizeof(breq))
1503                         break;
1504
1505                 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1506                     sizeof(breq.ifbr_ifsname));
1507                 breq.ifbr_ifsflags = bif->bif_flags;
1508                 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1509                 memcpy(buf, &breq, sizeof(breq));
1510                 count++;
1511                 buf += sizeof(breq);
1512                 len -= sizeof(breq);
1513         }
1514
1515         bifc->ifbic_len = sizeof(breq) * count;
1516         error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1517         free(outbuf, M_TEMP);
1518         return (error);
1519 }
1520
1521 static int
1522 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1523 {
1524         struct ifbaconf *bac = arg;
1525         struct bridge_rtnode *brt;
1526         struct ifbareq bareq;
1527         char *buf, *outbuf;
1528         int count, buflen, len, error = 0;
1529
1530         if (bac->ifbac_len == 0)
1531                 return (0);
1532
1533         count = 0;
1534         CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1535                 count++;
1536         buflen = sizeof(bareq) * count;
1537
1538         outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO);
1539         if (outbuf == NULL)
1540                 return (ENOMEM);
1541
1542         count = 0;
1543         buf = outbuf;
1544         len = min(bac->ifbac_len, buflen);
1545         bzero(&bareq, sizeof(bareq));
1546         CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1547                 if (len < sizeof(bareq))
1548                         goto out;
1549                 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1550                     sizeof(bareq.ifba_ifsname));
1551                 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1552                 bareq.ifba_vlan = brt->brt_vlan;
1553                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1554                                 time_uptime < brt->brt_expire)
1555                         bareq.ifba_expire = brt->brt_expire - time_uptime;
1556                 else
1557                         bareq.ifba_expire = 0;
1558                 bareq.ifba_flags = brt->brt_flags;
1559
1560                 memcpy(buf, &bareq, sizeof(bareq));
1561                 count++;
1562                 buf += sizeof(bareq);
1563                 len -= sizeof(bareq);
1564         }
1565 out:
1566         bac->ifbac_len = sizeof(bareq) * count;
1567         error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1568         free(outbuf, M_TEMP);
1569         return (error);
1570 }
1571
1572 static int
1573 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1574 {
1575         struct ifbareq *req = arg;
1576         struct bridge_iflist *bif;
1577         struct epoch_tracker et;
1578         int error;
1579
1580         NET_EPOCH_ENTER(et);
1581         bif = bridge_lookup_member(sc, req->ifba_ifsname);
1582         if (bif == NULL) {
1583                 NET_EPOCH_EXIT(et);
1584                 return (ENOENT);
1585         }
1586
1587         /* bridge_rtupdate() may acquire the lock. */
1588         error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1589             req->ifba_flags);
1590         NET_EPOCH_EXIT(et);
1591
1592         return (error);
1593 }
1594
1595 static int
1596 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1597 {
1598         struct ifbrparam *param = arg;
1599
1600         sc->sc_brttimeout = param->ifbrp_ctime;
1601         return (0);
1602 }
1603
1604 static int
1605 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1606 {
1607         struct ifbrparam *param = arg;
1608
1609         param->ifbrp_ctime = sc->sc_brttimeout;
1610         return (0);
1611 }
1612
1613 static int
1614 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1615 {
1616         struct ifbareq *req = arg;
1617
1618         return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
1619 }
1620
1621 static int
1622 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1623 {
1624         struct ifbreq *req = arg;
1625
1626         BRIDGE_RT_LOCK(sc);
1627         bridge_rtflush(sc, req->ifbr_ifsflags);
1628         BRIDGE_RT_UNLOCK(sc);
1629
1630         return (0);
1631 }
1632
1633 static int
1634 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1635 {
1636         struct ifbrparam *param = arg;
1637         struct bstp_state *bs = &sc->sc_stp;
1638
1639         param->ifbrp_prio = bs->bs_bridge_priority;
1640         return (0);
1641 }
1642
1643 static int
1644 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1645 {
1646         struct ifbrparam *param = arg;
1647
1648         return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1649 }
1650
1651 static int
1652 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1653 {
1654         struct ifbrparam *param = arg;
1655         struct bstp_state *bs = &sc->sc_stp;
1656
1657         param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1658         return (0);
1659 }
1660
1661 static int
1662 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1663 {
1664         struct ifbrparam *param = arg;
1665
1666         return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1667 }
1668
1669 static int
1670 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1671 {
1672         struct ifbrparam *param = arg;
1673         struct bstp_state *bs = &sc->sc_stp;
1674
1675         param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1676         return (0);
1677 }
1678
1679 static int
1680 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1681 {
1682         struct ifbrparam *param = arg;
1683
1684         return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1685 }
1686
1687 static int
1688 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1689 {
1690         struct ifbrparam *param = arg;
1691         struct bstp_state *bs = &sc->sc_stp;
1692
1693         param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1694         return (0);
1695 }
1696
1697 static int
1698 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1699 {
1700         struct ifbrparam *param = arg;
1701
1702         return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1703 }
1704
1705 static int
1706 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1707 {
1708         struct ifbreq *req = arg;
1709         struct bridge_iflist *bif;
1710
1711         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1712         if (bif == NULL)
1713                 return (ENOENT);
1714
1715         return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1716 }
1717
1718 static int
1719 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1720 {
1721         struct ifbreq *req = arg;
1722         struct bridge_iflist *bif;
1723
1724         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1725         if (bif == NULL)
1726                 return (ENOENT);
1727
1728         return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1729 }
1730
1731 static int
1732 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1733 {
1734         struct ifbreq *req = arg;
1735         struct bridge_iflist *bif;
1736
1737         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1738         if (bif == NULL)
1739                 return (ENOENT);
1740
1741         bif->bif_addrmax = req->ifbr_addrmax;
1742         return (0);
1743 }
1744
1745 static int
1746 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1747 {
1748         struct ifbreq *req = arg;
1749         struct bridge_iflist *bif = NULL;
1750         struct ifnet *ifs;
1751
1752         ifs = ifunit(req->ifbr_ifsname);
1753         if (ifs == NULL)
1754                 return (ENOENT);
1755
1756         CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1757                 if (ifs == bif->bif_ifp)
1758                         return (EBUSY);
1759
1760         if (ifs->if_bridge != NULL)
1761                 return (EBUSY);
1762
1763         switch (ifs->if_type) {
1764                 case IFT_ETHER:
1765                 case IFT_GIF:
1766                 case IFT_L2VLAN:
1767                         break;
1768                 default:
1769                         return (EINVAL);
1770         }
1771
1772         bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1773         if (bif == NULL)
1774                 return (ENOMEM);
1775
1776         bif->bif_ifp = ifs;
1777         bif->bif_flags = IFBIF_SPAN;
1778
1779         CK_LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1780
1781         return (0);
1782 }
1783
1784 static int
1785 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1786 {
1787         struct ifbreq *req = arg;
1788         struct bridge_iflist *bif;
1789         struct ifnet *ifs;
1790
1791         ifs = ifunit(req->ifbr_ifsname);
1792         if (ifs == NULL)
1793                 return (ENOENT);
1794
1795         CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1796                 if (ifs == bif->bif_ifp)
1797                         break;
1798
1799         if (bif == NULL)
1800                 return (ENOENT);
1801
1802         bridge_delete_span(sc, bif);
1803
1804         return (0);
1805 }
1806
1807 static int
1808 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1809 {
1810         struct ifbropreq *req = arg;
1811         struct bstp_state *bs = &sc->sc_stp;
1812         struct bstp_port *root_port;
1813
1814         req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1815         req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1816         req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1817
1818         root_port = bs->bs_root_port;
1819         if (root_port == NULL)
1820                 req->ifbop_root_port = 0;
1821         else
1822                 req->ifbop_root_port = root_port->bp_ifp->if_index;
1823
1824         req->ifbop_holdcount = bs->bs_txholdcount;
1825         req->ifbop_priority = bs->bs_bridge_priority;
1826         req->ifbop_protocol = bs->bs_protover;
1827         req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1828         req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1829         req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1830         req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1831         req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1832         req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1833
1834         return (0);
1835 }
1836
1837 static int
1838 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1839 {
1840         struct ifbrparam *param = arg;
1841
1842         param->ifbrp_cexceeded = sc->sc_brtexceeded;
1843         return (0);
1844 }
1845
1846 static int
1847 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1848 {
1849         struct ifbpstpconf *bifstp = arg;
1850         struct bridge_iflist *bif;
1851         struct bstp_port *bp;
1852         struct ifbpstpreq bpreq;
1853         char *buf, *outbuf;
1854         int count, buflen, len, error = 0;
1855
1856         count = 0;
1857         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1858                 if ((bif->bif_flags & IFBIF_STP) != 0)
1859                         count++;
1860         }
1861
1862         buflen = sizeof(bpreq) * count;
1863         if (bifstp->ifbpstp_len == 0) {
1864                 bifstp->ifbpstp_len = buflen;
1865                 return (0);
1866         }
1867
1868         outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO);
1869         if (outbuf == NULL)
1870                 return (ENOMEM);
1871
1872         count = 0;
1873         buf = outbuf;
1874         len = min(bifstp->ifbpstp_len, buflen);
1875         bzero(&bpreq, sizeof(bpreq));
1876         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1877                 if (len < sizeof(bpreq))
1878                         break;
1879
1880                 if ((bif->bif_flags & IFBIF_STP) == 0)
1881                         continue;
1882
1883                 bp = &bif->bif_stp;
1884                 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1885                 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1886                 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1887                 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1888                 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1889                 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1890
1891                 memcpy(buf, &bpreq, sizeof(bpreq));
1892                 count++;
1893                 buf += sizeof(bpreq);
1894                 len -= sizeof(bpreq);
1895         }
1896
1897         bifstp->ifbpstp_len = sizeof(bpreq) * count;
1898         error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1899         free(outbuf, M_TEMP);
1900         return (error);
1901 }
1902
1903 static int
1904 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1905 {
1906         struct ifbrparam *param = arg;
1907
1908         return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1909 }
1910
1911 static int
1912 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1913 {
1914         struct ifbrparam *param = arg;
1915
1916         return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1917 }
1918
1919 /*
1920  * bridge_ifdetach:
1921  *
1922  *      Detach an interface from a bridge.  Called when a member
1923  *      interface is detaching.
1924  */
1925 static void
1926 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1927 {
1928         struct bridge_softc *sc = ifp->if_bridge;
1929         struct bridge_iflist *bif;
1930
1931         if (ifp->if_flags & IFF_RENAMING)
1932                 return;
1933         if (V_bridge_cloner == NULL) {
1934                 /*
1935                  * This detach handler can be called after
1936                  * vnet_bridge_uninit().  Just return in that case.
1937                  */
1938                 return;
1939         }
1940         /* Check if the interface is a bridge member */
1941         if (sc != NULL) {
1942                 BRIDGE_LOCK(sc);
1943
1944                 bif = bridge_lookup_member_if(sc, ifp);
1945                 if (bif != NULL)
1946                         bridge_delete_member(sc, bif, 1);
1947
1948                 BRIDGE_UNLOCK(sc);
1949                 return;
1950         }
1951
1952         /* Check if the interface is a span port */
1953         BRIDGE_LIST_LOCK();
1954         LIST_FOREACH(sc, &V_bridge_list, sc_list) {
1955                 BRIDGE_LOCK(sc);
1956                 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1957                         if (ifp == bif->bif_ifp) {
1958                                 bridge_delete_span(sc, bif);
1959                                 break;
1960                         }
1961
1962                 BRIDGE_UNLOCK(sc);
1963         }
1964         BRIDGE_LIST_UNLOCK();
1965 }
1966
1967 /*
1968  * bridge_init:
1969  *
1970  *      Initialize a bridge interface.
1971  */
1972 static void
1973 bridge_init(void *xsc)
1974 {
1975         struct bridge_softc *sc = (struct bridge_softc *)xsc;
1976         struct ifnet *ifp = sc->sc_ifp;
1977
1978         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1979                 return;
1980
1981         BRIDGE_LOCK(sc);
1982         callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1983             bridge_timer, sc);
1984
1985         ifp->if_drv_flags |= IFF_DRV_RUNNING;
1986         bstp_init(&sc->sc_stp);         /* Initialize Spanning Tree */
1987
1988         BRIDGE_UNLOCK(sc);
1989 }
1990
1991 /*
1992  * bridge_stop:
1993  *
1994  *      Stop the bridge interface.
1995  */
1996 static void
1997 bridge_stop(struct ifnet *ifp, int disable)
1998 {
1999         struct bridge_softc *sc = ifp->if_softc;
2000
2001         BRIDGE_LOCK_ASSERT(sc);
2002
2003         if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2004                 return;
2005
2006         BRIDGE_RT_LOCK(sc);
2007         callout_stop(&sc->sc_brcallout);
2008
2009         bstp_stop(&sc->sc_stp);
2010
2011         bridge_rtflush(sc, IFBF_FLUSHDYN);
2012         BRIDGE_RT_UNLOCK(sc);
2013
2014         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
2015 }
2016
2017 /*
2018  * bridge_enqueue:
2019  *
2020  *      Enqueue a packet on a bridge member interface.
2021  *
2022  */
2023 static int
2024 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
2025 {
2026         int len, err = 0;
2027         short mflags;
2028         struct mbuf *m0;
2029
2030         /* We may be sending a fragment so traverse the mbuf */
2031         for (; m; m = m0) {
2032                 m0 = m->m_nextpkt;
2033                 m->m_nextpkt = NULL;
2034                 len = m->m_pkthdr.len;
2035                 mflags = m->m_flags;
2036
2037                 /*
2038                  * If underlying interface can not do VLAN tag insertion itself
2039                  * then attach a packet tag that holds it.
2040                  */
2041                 if ((m->m_flags & M_VLANTAG) &&
2042                     (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
2043                         m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
2044                         if (m == NULL) {
2045                                 if_printf(dst_ifp,
2046                                     "unable to prepend VLAN header\n");
2047                                 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1);
2048                                 continue;
2049                         }
2050                         m->m_flags &= ~M_VLANTAG;
2051                 }
2052
2053                 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */
2054                 if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
2055                         m_freem(m0);
2056                         if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2057                         break;
2058                 }
2059
2060                 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1);
2061                 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len);
2062                 if (mflags & M_MCAST)
2063                         if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1);
2064         }
2065
2066         return (err);
2067 }
2068
2069 /*
2070  * bridge_dummynet:
2071  *
2072  *      Receive a queued packet from dummynet and pass it on to the output
2073  *      interface.
2074  *
2075  *      The mbuf has the Ethernet header already attached.
2076  */
2077 static void
2078 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
2079 {
2080         struct bridge_softc *sc;
2081
2082         sc = ifp->if_bridge;
2083
2084         /*
2085          * The packet didnt originate from a member interface. This should only
2086          * ever happen if a member interface is removed while packets are
2087          * queued for it.
2088          */
2089         if (sc == NULL) {
2090                 m_freem(m);
2091                 return;
2092         }
2093
2094         if (PFIL_HOOKED_OUT(V_inet_pfil_head)
2095 #ifdef INET6
2096             || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2097 #endif
2098             ) {
2099                 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
2100                         return;
2101                 if (m == NULL)
2102                         return;
2103         }
2104
2105         bridge_enqueue(sc, ifp, m);
2106 }
2107
2108 /*
2109  * bridge_output:
2110  *
2111  *      Send output from a bridge member interface.  This
2112  *      performs the bridging function for locally originated
2113  *      packets.
2114  *
2115  *      The mbuf has the Ethernet header already attached.  We must
2116  *      enqueue or free the mbuf before returning.
2117  */
2118 static int
2119 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
2120     struct rtentry *rt)
2121 {
2122         struct ether_header *eh;
2123         struct ifnet *bifp, *dst_if;
2124         struct bridge_softc *sc;
2125         uint16_t vlan;
2126
2127         NET_EPOCH_ASSERT();
2128
2129         if (m->m_len < ETHER_HDR_LEN) {
2130                 m = m_pullup(m, ETHER_HDR_LEN);
2131                 if (m == NULL)
2132                         return (0);
2133         }
2134
2135         eh = mtod(m, struct ether_header *);
2136         sc = ifp->if_bridge;
2137         vlan = VLANTAGOF(m);
2138
2139         bifp = sc->sc_ifp;
2140
2141         /*
2142          * If bridge is down, but the original output interface is up,
2143          * go ahead and send out that interface.  Otherwise, the packet
2144          * is dropped below.
2145          */
2146         if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2147                 dst_if = ifp;
2148                 goto sendunicast;
2149         }
2150
2151         /*
2152          * If the packet is a multicast, or we don't know a better way to
2153          * get there, send to all interfaces.
2154          */
2155         if (ETHER_IS_MULTICAST(eh->ether_dhost))
2156                 dst_if = NULL;
2157         else
2158                 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
2159         /* Tap any traffic not passing back out the originating interface */
2160         if (dst_if != ifp)
2161                 ETHER_BPF_MTAP(bifp, m);
2162         if (dst_if == NULL) {
2163                 struct bridge_iflist *bif;
2164                 struct mbuf *mc;
2165                 int used = 0;
2166
2167                 bridge_span(sc, m);
2168
2169                 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
2170                         dst_if = bif->bif_ifp;
2171
2172                         if (dst_if->if_type == IFT_GIF)
2173                                 continue;
2174                         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2175                                 continue;
2176
2177                         /*
2178                          * If this is not the original output interface,
2179                          * and the interface is participating in spanning
2180                          * tree, make sure the port is in a state that
2181                          * allows forwarding.
2182                          */
2183                         if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
2184                             bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2185                                 continue;
2186
2187                         if (CK_LIST_NEXT(bif, bif_next) == NULL) {
2188                                 used = 1;
2189                                 mc = m;
2190                         } else {
2191                                 mc = m_dup(m, M_NOWAIT);
2192                                 if (mc == NULL) {
2193                                         if_inc_counter(bifp, IFCOUNTER_OERRORS, 1);
2194                                         continue;
2195                                 }
2196                         }
2197
2198                         bridge_enqueue(sc, dst_if, mc);
2199                 }
2200                 if (used == 0)
2201                         m_freem(m);
2202                 return (0);
2203         }
2204
2205 sendunicast:
2206         /*
2207          * XXX Spanning tree consideration here?
2208          */
2209
2210         bridge_span(sc, m);
2211         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2212                 m_freem(m);
2213                 return (0);
2214         }
2215
2216         bridge_enqueue(sc, dst_if, m);
2217         return (0);
2218 }
2219
2220 /*
2221  * bridge_transmit:
2222  *
2223  *      Do output on a bridge.
2224  *
2225  */
2226 static int
2227 bridge_transmit(struct ifnet *ifp, struct mbuf *m)
2228 {
2229         struct bridge_softc *sc;
2230         struct ether_header *eh;
2231         struct ifnet *dst_if;
2232         int error = 0;
2233
2234         sc = ifp->if_softc;
2235
2236         ETHER_BPF_MTAP(ifp, m);
2237
2238         eh = mtod(m, struct ether_header *);
2239
2240         if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) &&
2241             (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) {
2242                 error = bridge_enqueue(sc, dst_if, m);
2243         } else
2244                 bridge_broadcast(sc, ifp, m, 0);
2245
2246         return (error);
2247 }
2248
2249 #ifdef ALTQ
2250 static void
2251 bridge_altq_start(if_t ifp)
2252 {
2253         struct ifaltq *ifq = &ifp->if_snd;
2254         struct mbuf *m;
2255
2256         IFQ_LOCK(ifq);
2257         IFQ_DEQUEUE_NOLOCK(ifq, m);
2258         while (m != NULL) {
2259                 bridge_transmit(ifp, m);
2260                 IFQ_DEQUEUE_NOLOCK(ifq, m);
2261         }
2262         IFQ_UNLOCK(ifq);
2263 }
2264
2265 static int
2266 bridge_altq_transmit(if_t ifp, struct mbuf *m)
2267 {
2268         int err;
2269
2270         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
2271                 IFQ_ENQUEUE(&ifp->if_snd, m, err);
2272                 if (err == 0)
2273                         bridge_altq_start(ifp);
2274         } else
2275                 err = bridge_transmit(ifp, m);
2276
2277         return (err);
2278 }
2279 #endif  /* ALTQ */
2280
2281 /*
2282  * The ifp->if_qflush entry point for if_bridge(4) is no-op.
2283  */
2284 static void
2285 bridge_qflush(struct ifnet *ifp __unused)
2286 {
2287 }
2288
2289 /*
2290  * bridge_forward:
2291  *
2292  *      The forwarding function of the bridge.
2293  *
2294  *      NOTE: Releases the lock on return.
2295  */
2296 static void
2297 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
2298     struct mbuf *m)
2299 {
2300         struct bridge_iflist *dbif;
2301         struct ifnet *src_if, *dst_if, *ifp;
2302         struct ether_header *eh;
2303         uint16_t vlan;
2304         uint8_t *dst;
2305         int error;
2306
2307         NET_EPOCH_ASSERT();
2308
2309         src_if = m->m_pkthdr.rcvif;
2310         ifp = sc->sc_ifp;
2311
2312         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
2313         if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2314         vlan = VLANTAGOF(m);
2315
2316         if ((sbif->bif_flags & IFBIF_STP) &&
2317             sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2318                 goto drop;
2319
2320         eh = mtod(m, struct ether_header *);
2321         dst = eh->ether_dhost;
2322
2323         /* If the interface is learning, record the address. */
2324         if (sbif->bif_flags & IFBIF_LEARNING) {
2325                 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2326                     sbif, 0, IFBAF_DYNAMIC);
2327                 /*
2328                  * If the interface has addresses limits then deny any source
2329                  * that is not in the cache.
2330                  */
2331                 if (error && sbif->bif_addrmax)
2332                         goto drop;
2333         }
2334
2335         if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2336             sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2337                 goto drop;
2338
2339         /*
2340          * At this point, the port either doesn't participate
2341          * in spanning tree or it is in the forwarding state.
2342          */
2343
2344         /*
2345          * If the packet is unicast, destined for someone on
2346          * "this" side of the bridge, drop it.
2347          */
2348         if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2349                 dst_if = bridge_rtlookup(sc, dst, vlan);
2350                 if (src_if == dst_if)
2351                         goto drop;
2352         } else {
2353                 /*
2354                  * Check if its a reserved multicast address, any address
2355                  * listed in 802.1D section 7.12.6 may not be forwarded by the
2356                  * bridge.
2357                  * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2358                  */
2359                 if (dst[0] == 0x01 && dst[1] == 0x80 &&
2360                     dst[2] == 0xc2 && dst[3] == 0x00 &&
2361                     dst[4] == 0x00 && dst[5] <= 0x0f)
2362                         goto drop;
2363
2364                 /* ...forward it to all interfaces. */
2365                 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
2366                 dst_if = NULL;
2367         }
2368
2369         /*
2370          * If we have a destination interface which is a member of our bridge,
2371          * OR this is a unicast packet, push it through the bpf(4) machinery.
2372          * For broadcast or multicast packets, don't bother because it will
2373          * be reinjected into ether_input. We do this before we pass the packets
2374          * through the pfil(9) framework, as it is possible that pfil(9) will
2375          * drop the packet, or possibly modify it, making it difficult to debug
2376          * firewall issues on the bridge.
2377          */
2378         if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2379                 ETHER_BPF_MTAP(ifp, m);
2380
2381         /* run the packet filter */
2382         if (PFIL_HOOKED_IN(V_inet_pfil_head)
2383 #ifdef INET6
2384             || PFIL_HOOKED_IN(V_inet6_pfil_head)
2385 #endif
2386             ) {
2387                 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2388                         return;
2389                 if (m == NULL)
2390                         return;
2391         }
2392
2393         if (dst_if == NULL) {
2394                 bridge_broadcast(sc, src_if, m, 1);
2395                 return;
2396         }
2397
2398         /*
2399          * At this point, we're dealing with a unicast frame
2400          * going to a different interface.
2401          */
2402         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2403                 goto drop;
2404
2405         dbif = bridge_lookup_member_if(sc, dst_if);
2406         if (dbif == NULL)
2407                 /* Not a member of the bridge (anymore?) */
2408                 goto drop;
2409
2410         /* Private segments can not talk to each other */
2411         if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2412                 goto drop;
2413
2414         if ((dbif->bif_flags & IFBIF_STP) &&
2415             dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2416                 goto drop;
2417
2418         if (PFIL_HOOKED_OUT(V_inet_pfil_head)
2419 #ifdef INET6
2420             || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2421 #endif
2422             ) {
2423                 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2424                         return;
2425                 if (m == NULL)
2426                         return;
2427         }
2428
2429         bridge_enqueue(sc, dst_if, m);
2430         return;
2431
2432 drop:
2433         m_freem(m);
2434 }
2435
2436 /*
2437  * bridge_input:
2438  *
2439  *      Receive input from a member interface.  Queue the packet for
2440  *      bridging if it is not for us.
2441  */
2442 static struct mbuf *
2443 bridge_input(struct ifnet *ifp, struct mbuf *m)
2444 {
2445         struct bridge_softc *sc = ifp->if_bridge;
2446         struct bridge_iflist *bif, *bif2;
2447         struct ifnet *bifp;
2448         struct ether_header *eh;
2449         struct mbuf *mc, *mc2;
2450         uint16_t vlan;
2451         int error;
2452
2453         NET_EPOCH_ASSERT();
2454
2455         if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2456                 return (m);
2457
2458         bifp = sc->sc_ifp;
2459         vlan = VLANTAGOF(m);
2460
2461         /*
2462          * Implement support for bridge monitoring. If this flag has been
2463          * set on this interface, discard the packet once we push it through
2464          * the bpf(4) machinery, but before we do, increment the byte and
2465          * packet counters associated with this interface.
2466          */
2467         if ((bifp->if_flags & IFF_MONITOR) != 0) {
2468                 m->m_pkthdr.rcvif  = bifp;
2469                 ETHER_BPF_MTAP(bifp, m);
2470                 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1);
2471                 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2472                 m_freem(m);
2473                 return (NULL);
2474         }
2475         bif = bridge_lookup_member_if(sc, ifp);
2476         if (bif == NULL) {
2477                 return (m);
2478         }
2479
2480         eh = mtod(m, struct ether_header *);
2481
2482         bridge_span(sc, m);
2483
2484         if (m->m_flags & (M_BCAST|M_MCAST)) {
2485                 /* Tap off 802.1D packets; they do not get forwarded. */
2486                 if (memcmp(eh->ether_dhost, bstp_etheraddr,
2487                     ETHER_ADDR_LEN) == 0) {
2488                         bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
2489                         return (NULL);
2490                 }
2491
2492                 if ((bif->bif_flags & IFBIF_STP) &&
2493                     bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2494                         return (m);
2495                 }
2496
2497                 /*
2498                  * Make a deep copy of the packet and enqueue the copy
2499                  * for bridge processing; return the original packet for
2500                  * local processing.
2501                  */
2502                 mc = m_dup(m, M_NOWAIT);
2503                 if (mc == NULL) {
2504                         return (m);
2505                 }
2506
2507                 /* Perform the bridge forwarding function with the copy. */
2508                 bridge_forward(sc, bif, mc);
2509
2510                 /*
2511                  * Reinject the mbuf as arriving on the bridge so we have a
2512                  * chance at claiming multicast packets. We can not loop back
2513                  * here from ether_input as a bridge is never a member of a
2514                  * bridge.
2515                  */
2516                 KASSERT(bifp->if_bridge == NULL,
2517                     ("loop created in bridge_input"));
2518                 mc2 = m_dup(m, M_NOWAIT);
2519                 if (mc2 != NULL) {
2520                         /* Keep the layer3 header aligned */
2521                         int i = min(mc2->m_pkthdr.len, max_protohdr);
2522                         mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2523                 }
2524                 if (mc2 != NULL) {
2525                         mc2->m_pkthdr.rcvif = bifp;
2526                         (*bifp->if_input)(bifp, mc2);
2527                 }
2528
2529                 /* Return the original packet for local processing. */
2530                 return (m);
2531         }
2532
2533         if ((bif->bif_flags & IFBIF_STP) &&
2534             bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2535                 return (m);
2536         }
2537
2538 #if (defined(INET) || defined(INET6))
2539 #   define OR_CARP_CHECK_WE_ARE_DST(iface) \
2540         || ((iface)->if_carp \
2541             && (*carp_forus_p)((iface), eh->ether_dhost))
2542 #   define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2543         || ((iface)->if_carp \
2544             && (*carp_forus_p)((iface), eh->ether_shost))
2545 #else
2546 #   define OR_CARP_CHECK_WE_ARE_DST(iface)
2547 #   define OR_CARP_CHECK_WE_ARE_SRC(iface)
2548 #endif
2549
2550 #ifdef INET6
2551 #   define OR_PFIL_HOOKED_INET6 \
2552         || PFIL_HOOKED_IN(V_inet6_pfil_head)
2553 #else
2554 #   define OR_PFIL_HOOKED_INET6
2555 #endif
2556
2557 #define GRAB_OUR_PACKETS(iface) \
2558         if ((iface)->if_type == IFT_GIF) \
2559                 continue; \
2560         /* It is destined for us. */ \
2561         if (memcmp(IF_LLADDR((iface)), eh->ether_dhost,  ETHER_ADDR_LEN) == 0 \
2562             OR_CARP_CHECK_WE_ARE_DST((iface))                           \
2563             ) {                                                         \
2564                 if (bif->bif_flags & IFBIF_LEARNING) {                  \
2565                         error = bridge_rtupdate(sc, eh->ether_shost,    \
2566                             vlan, bif, 0, IFBAF_DYNAMIC);               \
2567                         if (error && bif->bif_addrmax) {                \
2568                                 m_freem(m);                             \
2569                                 return (NULL);                          \
2570                         }                                               \
2571                 }                                                       \
2572                 m->m_pkthdr.rcvif = iface;                              \
2573                 if ((iface) == ifp) {                                   \
2574                         /* Skip bridge processing... src == dest */     \
2575                         return (m);                                     \
2576                 }                                                       \
2577                 /* It's passing over or to the bridge, locally. */      \
2578                 ETHER_BPF_MTAP(bifp, m);                                \
2579                 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1);            \
2580                 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); \
2581                 /* Filter on the physical interface. */                 \
2582                 if (V_pfil_local_phys && (PFIL_HOOKED_IN(V_inet_pfil_head) \
2583                      OR_PFIL_HOOKED_INET6)) {                           \
2584                         if (bridge_pfil(&m, NULL, ifp,                  \
2585                             PFIL_IN) != 0 || m == NULL) {               \
2586                                 return (NULL);                          \
2587                         }                                               \
2588                 }                                                       \
2589                 if ((iface) != bifp)                                    \
2590                         ETHER_BPF_MTAP(iface, m);                       \
2591                 return (m);                                             \
2592         }                                                               \
2593                                                                         \
2594         /* We just received a packet that we sent out. */               \
2595         if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2596             OR_CARP_CHECK_WE_ARE_SRC((iface))                   \
2597             ) {                                                         \
2598                 m_freem(m);                                             \
2599                 return (NULL);                                          \
2600         }
2601
2602         /*
2603          * Unicast.  Make sure it's not for the bridge.
2604          */
2605         do { GRAB_OUR_PACKETS(bifp) } while (0);
2606
2607         /*
2608          * Give a chance for ifp at first priority. This will help when the
2609          * packet comes through the interface like VLAN's with the same MACs
2610          * on several interfaces from the same bridge. This also will save
2611          * some CPU cycles in case the destination interface and the input
2612          * interface (eq ifp) are the same.
2613          */
2614         do { GRAB_OUR_PACKETS(ifp) } while (0);
2615
2616         /* Now check the all bridge members. */
2617         CK_LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2618                 GRAB_OUR_PACKETS(bif2->bif_ifp)
2619         }
2620
2621 #undef OR_CARP_CHECK_WE_ARE_DST
2622 #undef OR_CARP_CHECK_WE_ARE_SRC
2623 #undef OR_PFIL_HOOKED_INET6
2624 #undef GRAB_OUR_PACKETS
2625
2626         /* Perform the bridge forwarding function. */
2627         bridge_forward(sc, bif, m);
2628
2629         return (NULL);
2630 }
2631
2632 /*
2633  * bridge_broadcast:
2634  *
2635  *      Send a frame to all interfaces that are members of
2636  *      the bridge, except for the one on which the packet
2637  *      arrived.
2638  *
2639  *      NOTE: Releases the lock on return.
2640  */
2641 static void
2642 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2643     struct mbuf *m, int runfilt)
2644 {
2645         struct bridge_iflist *dbif, *sbif;
2646         struct mbuf *mc;
2647         struct ifnet *dst_if;
2648         int used = 0, i;
2649
2650         NET_EPOCH_ASSERT();
2651
2652         sbif = bridge_lookup_member_if(sc, src_if);
2653
2654         /* Filter on the bridge interface before broadcasting */
2655         if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head)
2656 #ifdef INET6
2657             || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2658 #endif
2659             )) {
2660                 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2661                         return;
2662                 if (m == NULL)
2663                         return;
2664         }
2665
2666         CK_LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2667                 dst_if = dbif->bif_ifp;
2668                 if (dst_if == src_if)
2669                         continue;
2670
2671                 /* Private segments can not talk to each other */
2672                 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2673                         continue;
2674
2675                 if ((dbif->bif_flags & IFBIF_STP) &&
2676                     dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2677                         continue;
2678
2679                 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2680                     (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2681                         continue;
2682
2683                 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2684                         continue;
2685
2686                 if (CK_LIST_NEXT(dbif, bif_next) == NULL) {
2687                         mc = m;
2688                         used = 1;
2689                 } else {
2690                         mc = m_dup(m, M_NOWAIT);
2691                         if (mc == NULL) {
2692                                 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2693                                 continue;
2694                         }
2695                 }
2696
2697                 /*
2698                  * Filter on the output interface. Pass a NULL bridge interface
2699                  * pointer so we do not redundantly filter on the bridge for
2700                  * each interface we broadcast on.
2701                  */
2702                 if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head)
2703 #ifdef INET6
2704                     || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2705 #endif
2706                     )) {
2707                         if (used == 0) {
2708                                 /* Keep the layer3 header aligned */
2709                                 i = min(mc->m_pkthdr.len, max_protohdr);
2710                                 mc = m_copyup(mc, i, ETHER_ALIGN);
2711                                 if (mc == NULL) {
2712                                         if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2713                                         continue;
2714                                 }
2715                         }
2716                         if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2717                                 continue;
2718                         if (mc == NULL)
2719                                 continue;
2720                 }
2721
2722                 bridge_enqueue(sc, dst_if, mc);
2723         }
2724         if (used == 0)
2725                 m_freem(m);
2726 }
2727
2728 /*
2729  * bridge_span:
2730  *
2731  *      Duplicate a packet out one or more interfaces that are in span mode,
2732  *      the original mbuf is unmodified.
2733  */
2734 static void
2735 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2736 {
2737         struct bridge_iflist *bif;
2738         struct ifnet *dst_if;
2739         struct mbuf *mc;
2740
2741         NET_EPOCH_ASSERT();
2742
2743         if (CK_LIST_EMPTY(&sc->sc_spanlist))
2744                 return;
2745
2746         CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2747                 dst_if = bif->bif_ifp;
2748
2749                 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2750                         continue;
2751
2752                 mc = m_dup(m, M_NOWAIT);
2753                 if (mc == NULL) {
2754                         if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2755                         continue;
2756                 }
2757
2758                 bridge_enqueue(sc, dst_if, mc);
2759         }
2760 }
2761
2762 /*
2763  * bridge_rtupdate:
2764  *
2765  *      Add a bridge routing entry.
2766  */
2767 static int
2768 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2769     struct bridge_iflist *bif, int setflags, uint8_t flags)
2770 {
2771         struct bridge_rtnode *brt;
2772         int error;
2773
2774         BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
2775
2776         /* Check the source address is valid and not multicast. */
2777         if (ETHER_IS_MULTICAST(dst) ||
2778             (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2779              dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2780                 return (EINVAL);
2781
2782         /* 802.1p frames map to vlan 1 */
2783         if (vlan == 0)
2784                 vlan = 1;
2785
2786         /*
2787          * A route for this destination might already exist.  If so,
2788          * update it, otherwise create a new one.
2789          */
2790         if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2791                 BRIDGE_RT_LOCK(sc);
2792
2793                 /* Check again, now that we have the lock. There could have
2794                  * been a race and we only want to insert this once. */
2795                 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) != NULL) {
2796                         BRIDGE_RT_UNLOCK(sc);
2797                         return (0);
2798                 }
2799
2800                 if (sc->sc_brtcnt >= sc->sc_brtmax) {
2801                         sc->sc_brtexceeded++;
2802                         BRIDGE_RT_UNLOCK(sc);
2803                         return (ENOSPC);
2804                 }
2805                 /* Check per interface address limits (if enabled) */
2806                 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2807                         bif->bif_addrexceeded++;
2808                         BRIDGE_RT_UNLOCK(sc);
2809                         return (ENOSPC);
2810                 }
2811
2812                 /*
2813                  * Allocate a new bridge forwarding node, and
2814                  * initialize the expiration time and Ethernet
2815                  * address.
2816                  */
2817                 brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2818                 if (brt == NULL) {
2819                         BRIDGE_RT_UNLOCK(sc);
2820                         return (ENOMEM);
2821                 }
2822                 brt->brt_vnet = curvnet;
2823
2824                 if (bif->bif_flags & IFBIF_STICKY)
2825                         brt->brt_flags = IFBAF_STICKY;
2826                 else
2827                         brt->brt_flags = IFBAF_DYNAMIC;
2828
2829                 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2830                 brt->brt_vlan = vlan;
2831
2832                 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2833                         uma_zfree(V_bridge_rtnode_zone, brt);
2834                         BRIDGE_RT_UNLOCK(sc);
2835                         return (error);
2836                 }
2837                 brt->brt_dst = bif;
2838                 bif->bif_addrcnt++;
2839
2840                 BRIDGE_RT_UNLOCK(sc);
2841         }
2842
2843         if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2844             brt->brt_dst != bif) {
2845                 BRIDGE_RT_LOCK(sc);
2846                 brt->brt_dst->bif_addrcnt--;
2847                 brt->brt_dst = bif;
2848                 brt->brt_dst->bif_addrcnt++;
2849                 BRIDGE_RT_UNLOCK(sc);
2850         }
2851
2852         if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2853                 brt->brt_expire = time_uptime + sc->sc_brttimeout;
2854         if (setflags)
2855                 brt->brt_flags = flags;
2856
2857         return (0);
2858 }
2859
2860 /*
2861  * bridge_rtlookup:
2862  *
2863  *      Lookup the destination interface for an address.
2864  */
2865 static struct ifnet *
2866 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2867 {
2868         struct bridge_rtnode *brt;
2869
2870         NET_EPOCH_ASSERT();
2871
2872         if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2873                 return (NULL);
2874
2875         return (brt->brt_ifp);
2876 }
2877
2878 /*
2879  * bridge_rttrim:
2880  *
2881  *      Trim the routine table so that we have a number
2882  *      of routing entries less than or equal to the
2883  *      maximum number.
2884  */
2885 static void
2886 bridge_rttrim(struct bridge_softc *sc)
2887 {
2888         struct bridge_rtnode *brt, *nbrt;
2889
2890         NET_EPOCH_ASSERT();
2891         BRIDGE_RT_LOCK_ASSERT(sc);
2892
2893         /* Make sure we actually need to do this. */
2894         if (sc->sc_brtcnt <= sc->sc_brtmax)
2895                 return;
2896
2897         /* Force an aging cycle; this might trim enough addresses. */
2898         bridge_rtage(sc);
2899         if (sc->sc_brtcnt <= sc->sc_brtmax)
2900                 return;
2901
2902         CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2903                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2904                         bridge_rtnode_destroy(sc, brt);
2905                         if (sc->sc_brtcnt <= sc->sc_brtmax)
2906                                 return;
2907                 }
2908         }
2909 }
2910
2911 /*
2912  * bridge_timer:
2913  *
2914  *      Aging timer for the bridge.
2915  */
2916 static void
2917 bridge_timer(void *arg)
2918 {
2919         struct bridge_softc *sc = arg;
2920
2921         BRIDGE_RT_LOCK_ASSERT(sc);
2922
2923         /* Destruction of rtnodes requires a proper vnet context */
2924         CURVNET_SET(sc->sc_ifp->if_vnet);
2925         bridge_rtage(sc);
2926
2927         if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2928                 callout_reset(&sc->sc_brcallout,
2929                     bridge_rtable_prune_period * hz, bridge_timer, sc);
2930         CURVNET_RESTORE();
2931 }
2932
2933 /*
2934  * bridge_rtage:
2935  *
2936  *      Perform an aging cycle.
2937  */
2938 static void
2939 bridge_rtage(struct bridge_softc *sc)
2940 {
2941         struct bridge_rtnode *brt, *nbrt;
2942
2943         BRIDGE_RT_LOCK_ASSERT(sc);
2944
2945         CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2946                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2947                         if (time_uptime >= brt->brt_expire)
2948                                 bridge_rtnode_destroy(sc, brt);
2949                 }
2950         }
2951 }
2952
2953 /*
2954  * bridge_rtflush:
2955  *
2956  *      Remove all dynamic addresses from the bridge.
2957  */
2958 static void
2959 bridge_rtflush(struct bridge_softc *sc, int full)
2960 {
2961         struct bridge_rtnode *brt, *nbrt;
2962
2963         BRIDGE_RT_LOCK_ASSERT(sc);
2964
2965         CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2966                 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2967                         bridge_rtnode_destroy(sc, brt);
2968         }
2969 }
2970
2971 /*
2972  * bridge_rtdaddr:
2973  *
2974  *      Remove an address from the table.
2975  */
2976 static int
2977 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2978 {
2979         struct bridge_rtnode *brt;
2980         int found = 0;
2981
2982         BRIDGE_RT_LOCK(sc);
2983
2984         /*
2985          * If vlan is zero then we want to delete for all vlans so the lookup
2986          * may return more than one.
2987          */
2988         while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
2989                 bridge_rtnode_destroy(sc, brt);
2990                 found = 1;
2991         }
2992
2993         BRIDGE_RT_UNLOCK(sc);
2994
2995         return (found ? 0 : ENOENT);
2996 }
2997
2998 /*
2999  * bridge_rtdelete:
3000  *
3001  *      Delete routes to a speicifc member interface.
3002  */
3003 static void
3004 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
3005 {
3006         struct bridge_rtnode *brt, *nbrt;
3007
3008         BRIDGE_RT_LOCK_ASSERT(sc);
3009
3010         CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
3011                 if (brt->brt_ifp == ifp && (full ||
3012                             (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
3013                         bridge_rtnode_destroy(sc, brt);
3014         }
3015 }
3016
3017 /*
3018  * bridge_rtable_init:
3019  *
3020  *      Initialize the route table for this bridge.
3021  */
3022 static void
3023 bridge_rtable_init(struct bridge_softc *sc)
3024 {
3025         int i;
3026
3027         sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
3028             M_DEVBUF, M_WAITOK);
3029
3030         for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
3031                 CK_LIST_INIT(&sc->sc_rthash[i]);
3032
3033         sc->sc_rthash_key = arc4random();
3034         CK_LIST_INIT(&sc->sc_rtlist);
3035 }
3036
3037 /*
3038  * bridge_rtable_fini:
3039  *
3040  *      Deconstruct the route table for this bridge.
3041  */
3042 static void
3043 bridge_rtable_fini(struct bridge_softc *sc)
3044 {
3045
3046         KASSERT(sc->sc_brtcnt == 0,
3047             ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
3048         free(sc->sc_rthash, M_DEVBUF);
3049 }
3050
3051 /*
3052  * The following hash function is adapted from "Hash Functions" by Bob Jenkins
3053  * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
3054  */
3055 #define mix(a, b, c)                                                    \
3056 do {                                                                    \
3057         a -= b; a -= c; a ^= (c >> 13);                                 \
3058         b -= c; b -= a; b ^= (a << 8);                                  \
3059         c -= a; c -= b; c ^= (b >> 13);                                 \
3060         a -= b; a -= c; a ^= (c >> 12);                                 \
3061         b -= c; b -= a; b ^= (a << 16);                                 \
3062         c -= a; c -= b; c ^= (b >> 5);                                  \
3063         a -= b; a -= c; a ^= (c >> 3);                                  \
3064         b -= c; b -= a; b ^= (a << 10);                                 \
3065         c -= a; c -= b; c ^= (b >> 15);                                 \
3066 } while (/*CONSTCOND*/0)
3067
3068 static __inline uint32_t
3069 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
3070 {
3071         uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
3072
3073         b += addr[5] << 8;
3074         b += addr[4];
3075         a += addr[3] << 24;
3076         a += addr[2] << 16;
3077         a += addr[1] << 8;
3078         a += addr[0];
3079
3080         mix(a, b, c);
3081
3082         return (c & BRIDGE_RTHASH_MASK);
3083 }
3084
3085 #undef mix
3086
3087 static int
3088 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
3089 {
3090         int i, d;
3091
3092         for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
3093                 d = ((int)a[i]) - ((int)b[i]);
3094         }
3095
3096         return (d);
3097 }
3098
3099 /*
3100  * bridge_rtnode_lookup:
3101  *
3102  *      Look up a bridge route node for the specified destination. Compare the
3103  *      vlan id or if zero then just return the first match.
3104  */
3105 static struct bridge_rtnode *
3106 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
3107 {
3108         struct bridge_rtnode *brt;
3109         uint32_t hash;
3110         int dir;
3111
3112         BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(sc);
3113
3114         hash = bridge_rthash(sc, addr);
3115         CK_LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
3116                 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
3117                 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
3118                         return (brt);
3119                 if (dir > 0)
3120                         return (NULL);
3121         }
3122
3123         return (NULL);
3124 }
3125
3126 /*
3127  * bridge_rtnode_insert:
3128  *
3129  *      Insert the specified bridge node into the route table.  We
3130  *      assume the entry is not already in the table.
3131  */
3132 static int
3133 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
3134 {
3135         struct bridge_rtnode *lbrt;
3136         uint32_t hash;
3137         int dir;
3138
3139         BRIDGE_RT_LOCK_ASSERT(sc);
3140
3141         hash = bridge_rthash(sc, brt->brt_addr);
3142
3143         lbrt = CK_LIST_FIRST(&sc->sc_rthash[hash]);
3144         if (lbrt == NULL) {
3145                 CK_LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
3146                 goto out;
3147         }
3148
3149         do {
3150                 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
3151                 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
3152                         return (EEXIST);
3153                 if (dir > 0) {
3154                         CK_LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
3155                         goto out;
3156                 }
3157                 if (CK_LIST_NEXT(lbrt, brt_hash) == NULL) {
3158                         CK_LIST_INSERT_AFTER(lbrt, brt, brt_hash);
3159                         goto out;
3160                 }
3161                 lbrt = CK_LIST_NEXT(lbrt, brt_hash);
3162         } while (lbrt != NULL);
3163
3164 #ifdef DIAGNOSTIC
3165         panic("bridge_rtnode_insert: impossible");
3166 #endif
3167
3168 out:
3169         CK_LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
3170         sc->sc_brtcnt++;
3171
3172         return (0);
3173 }
3174
3175 static void
3176 bridge_rtnode_destroy_cb(struct epoch_context *ctx)
3177 {
3178         struct bridge_rtnode *brt;
3179
3180         brt = __containerof(ctx, struct bridge_rtnode, brt_epoch_ctx);
3181
3182         CURVNET_SET(brt->brt_vnet);
3183         uma_zfree(V_bridge_rtnode_zone, brt);
3184         CURVNET_RESTORE();
3185 }
3186
3187 /*
3188  * bridge_rtnode_destroy:
3189  *
3190  *      Destroy a bridge rtnode.
3191  */
3192 static void
3193 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
3194 {
3195         BRIDGE_RT_LOCK_ASSERT(sc);
3196
3197         CK_LIST_REMOVE(brt, brt_hash);
3198
3199         CK_LIST_REMOVE(brt, brt_list);
3200         sc->sc_brtcnt--;
3201         brt->brt_dst->bif_addrcnt--;
3202
3203         NET_EPOCH_CALL(bridge_rtnode_destroy_cb, &brt->brt_epoch_ctx);
3204 }
3205
3206 /*
3207  * bridge_rtable_expire:
3208  *
3209  *      Set the expiry time for all routes on an interface.
3210  */
3211 static void
3212 bridge_rtable_expire(struct ifnet *ifp, int age)
3213 {
3214         struct bridge_softc *sc = ifp->if_bridge;
3215         struct bridge_rtnode *brt;
3216
3217         CURVNET_SET(ifp->if_vnet);
3218         BRIDGE_RT_LOCK(sc);
3219
3220         /*
3221          * If the age is zero then flush, otherwise set all the expiry times to
3222          * age for the interface
3223          */
3224         if (age == 0)
3225                 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
3226         else {
3227                 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
3228                         /* Cap the expiry time to 'age' */
3229                         if (brt->brt_ifp == ifp &&
3230                             brt->brt_expire > time_uptime + age &&
3231                             (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
3232                                 brt->brt_expire = time_uptime + age;
3233                 }
3234         }
3235         BRIDGE_RT_UNLOCK(sc);
3236         CURVNET_RESTORE();
3237 }
3238
3239 /*
3240  * bridge_state_change:
3241  *
3242  *      Callback from the bridgestp code when a port changes states.
3243  */
3244 static void
3245 bridge_state_change(struct ifnet *ifp, int state)
3246 {
3247         struct bridge_softc *sc = ifp->if_bridge;
3248         static const char *stpstates[] = {
3249                 "disabled",
3250                 "listening",
3251                 "learning",
3252                 "forwarding",
3253                 "blocking",
3254                 "discarding"
3255         };
3256
3257         CURVNET_SET(ifp->if_vnet);
3258         if (V_log_stp)
3259                 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
3260                     sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
3261         CURVNET_RESTORE();
3262 }
3263
3264 /*
3265  * Send bridge packets through pfil if they are one of the types pfil can deal
3266  * with, or if they are ARP or REVARP.  (pfil will pass ARP and REVARP without
3267  * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
3268  * that interface.
3269  */
3270 static int
3271 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
3272 {
3273         int snap, error, i, hlen;
3274         struct ether_header *eh1, eh2;
3275         struct ip *ip;
3276         struct llc llc1;
3277         u_int16_t ether_type;
3278         pfil_return_t rv;
3279
3280         snap = 0;
3281         error = -1;     /* Default error if not error == 0 */
3282
3283 #if 0
3284         /* we may return with the IP fields swapped, ensure its not shared */
3285         KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
3286 #endif
3287
3288         if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0)
3289                 return (0); /* filtering is disabled */
3290
3291         i = min((*mp)->m_pkthdr.len, max_protohdr);
3292         if ((*mp)->m_len < i) {
3293             *mp = m_pullup(*mp, i);
3294             if (*mp == NULL) {
3295                 printf("%s: m_pullup failed\n", __func__);
3296                 return (-1);
3297             }
3298         }
3299
3300         eh1 = mtod(*mp, struct ether_header *);
3301         ether_type = ntohs(eh1->ether_type);
3302
3303         /*
3304          * Check for SNAP/LLC.
3305          */
3306         if (ether_type < ETHERMTU) {
3307                 struct llc *llc2 = (struct llc *)(eh1 + 1);
3308
3309                 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3310                     llc2->llc_dsap == LLC_SNAP_LSAP &&
3311                     llc2->llc_ssap == LLC_SNAP_LSAP &&
3312                     llc2->llc_control == LLC_UI) {
3313                         ether_type = htons(llc2->llc_un.type_snap.ether_type);
3314                         snap = 1;
3315                 }
3316         }
3317
3318         /*
3319          * If we're trying to filter bridge traffic, don't look at anything
3320          * other than IP and ARP traffic.  If the filter doesn't understand
3321          * IPv6, don't allow IPv6 through the bridge either.  This is lame
3322          * since if we really wanted, say, an AppleTalk filter, we are hosed,
3323          * but of course we don't have an AppleTalk filter to begin with.
3324          * (Note that since pfil doesn't understand ARP it will pass *ALL*
3325          * ARP traffic.)
3326          */
3327         switch (ether_type) {
3328                 case ETHERTYPE_ARP:
3329                 case ETHERTYPE_REVARP:
3330                         if (V_pfil_ipfw_arp == 0)
3331                                 return (0); /* Automatically pass */
3332                         break;
3333
3334                 case ETHERTYPE_IP:
3335 #ifdef INET6
3336                 case ETHERTYPE_IPV6:
3337 #endif /* INET6 */
3338                         break;
3339                 default:
3340                         /*
3341                          * Check to see if the user wants to pass non-ip
3342                          * packets, these will not be checked by pfil(9) and
3343                          * passed unconditionally so the default is to drop.
3344                          */
3345                         if (V_pfil_onlyip)
3346                                 goto bad;
3347         }
3348
3349         /* Run the packet through pfil before stripping link headers */
3350         if (PFIL_HOOKED_OUT(V_link_pfil_head) && V_pfil_ipfw != 0 &&
3351             dir == PFIL_OUT && ifp != NULL) {
3352                 switch (pfil_run_hooks(V_link_pfil_head, mp, ifp, dir, NULL)) {
3353                 case PFIL_DROPPED:
3354                         return (EACCES);
3355                 case PFIL_CONSUMED:
3356                         return (0);
3357                 }
3358         }
3359
3360         /* Strip off the Ethernet header and keep a copy. */
3361         m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3362         m_adj(*mp, ETHER_HDR_LEN);
3363
3364         /* Strip off snap header, if present */
3365         if (snap) {
3366                 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3367                 m_adj(*mp, sizeof(struct llc));
3368         }
3369
3370         /*
3371          * Check the IP header for alignment and errors
3372          */
3373         if (dir == PFIL_IN) {
3374                 switch (ether_type) {
3375                         case ETHERTYPE_IP:
3376                                 error = bridge_ip_checkbasic(mp);
3377                                 break;
3378 #ifdef INET6
3379                         case ETHERTYPE_IPV6:
3380                                 error = bridge_ip6_checkbasic(mp);
3381                                 break;
3382 #endif /* INET6 */
3383                         default:
3384                                 error = 0;
3385                 }
3386                 if (error)
3387                         goto bad;
3388         }
3389
3390         error = 0;
3391
3392         /*
3393          * Run the packet through pfil
3394          */
3395         rv = PFIL_PASS;
3396         switch (ether_type) {
3397         case ETHERTYPE_IP:
3398                 /*
3399                  * Run pfil on the member interface and the bridge, both can
3400                  * be skipped by clearing pfil_member or pfil_bridge.
3401                  *
3402                  * Keep the order:
3403                  *   in_if -> bridge_if -> out_if
3404                  */
3405                 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv =
3406                     pfil_run_hooks(V_inet_pfil_head, mp, bifp, dir, NULL)) !=
3407                     PFIL_PASS)
3408                         break;
3409
3410                 if (V_pfil_member && ifp != NULL && (rv =
3411                     pfil_run_hooks(V_inet_pfil_head, mp, ifp, dir, NULL)) !=
3412                     PFIL_PASS)
3413                         break;
3414
3415                 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv =
3416                     pfil_run_hooks(V_inet_pfil_head, mp, bifp, dir, NULL)) !=
3417                     PFIL_PASS)
3418                         break;
3419
3420                 /* check if we need to fragment the packet */
3421                 /* bridge_fragment generates a mbuf chain of packets */
3422                 /* that already include eth headers */
3423                 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) {
3424                         i = (*mp)->m_pkthdr.len;
3425                         if (i > ifp->if_mtu) {
3426                                 error = bridge_fragment(ifp, mp, &eh2, snap,
3427                                             &llc1);
3428                                 return (error);
3429                         }
3430                 }
3431
3432                 /* Recalculate the ip checksum. */
3433                 ip = mtod(*mp, struct ip *);
3434                 hlen = ip->ip_hl << 2;
3435                 if (hlen < sizeof(struct ip))
3436                         goto bad;
3437                 if (hlen > (*mp)->m_len) {
3438                         if ((*mp = m_pullup(*mp, hlen)) == NULL)
3439                                 goto bad;
3440                         ip = mtod(*mp, struct ip *);
3441                         if (ip == NULL)
3442                                 goto bad;
3443                 }
3444                 ip->ip_sum = 0;
3445                 if (hlen == sizeof(struct ip))
3446                         ip->ip_sum = in_cksum_hdr(ip);
3447                 else
3448                         ip->ip_sum = in_cksum(*mp, hlen);
3449
3450                 break;
3451 #ifdef INET6
3452         case ETHERTYPE_IPV6:
3453                 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv =
3454                     pfil_run_hooks(V_inet6_pfil_head, mp, bifp, dir, NULL)) !=
3455                     PFIL_PASS)
3456                         break;
3457
3458                 if (V_pfil_member && ifp != NULL && (rv =
3459                     pfil_run_hooks(V_inet6_pfil_head, mp, ifp, dir, NULL)) !=
3460                     PFIL_PASS)
3461                         break;
3462
3463                 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv =
3464                     pfil_run_hooks(V_inet6_pfil_head, mp, bifp, dir, NULL)) !=
3465                     PFIL_PASS)
3466                         break;
3467                 break;
3468 #endif
3469         }
3470
3471         switch (rv) {
3472         case PFIL_CONSUMED:
3473                 return (0);
3474         case PFIL_DROPPED:
3475                 return (EACCES);
3476         default:
3477                 break;
3478         }
3479
3480         error = -1;
3481
3482         /*
3483          * Finally, put everything back the way it was and return
3484          */
3485         if (snap) {
3486                 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT);
3487                 if (*mp == NULL)
3488                         return (error);
3489                 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3490         }
3491
3492         M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT);
3493         if (*mp == NULL)
3494                 return (error);
3495         bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3496
3497         return (0);
3498
3499 bad:
3500         m_freem(*mp);
3501         *mp = NULL;
3502         return (error);
3503 }
3504
3505 /*
3506  * Perform basic checks on header size since
3507  * pfil assumes ip_input has already processed
3508  * it for it.  Cut-and-pasted from ip_input.c.
3509  * Given how simple the IPv6 version is,
3510  * does the IPv4 version really need to be
3511  * this complicated?
3512  *
3513  * XXX Should we update ipstat here, or not?
3514  * XXX Right now we update ipstat but not
3515  * XXX csum_counter.
3516  */
3517 static int
3518 bridge_ip_checkbasic(struct mbuf **mp)
3519 {
3520         struct mbuf *m = *mp;
3521         struct ip *ip;
3522         int len, hlen;
3523         u_short sum;
3524
3525         if (*mp == NULL)
3526                 return (-1);
3527
3528         if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3529                 if ((m = m_copyup(m, sizeof(struct ip),
3530                         (max_linkhdr + 3) & ~3)) == NULL) {
3531                         /* XXXJRT new stat, please */
3532                         KMOD_IPSTAT_INC(ips_toosmall);
3533                         goto bad;
3534                 }
3535         } else if (__predict_false(m->m_len < sizeof (struct ip))) {
3536                 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3537                         KMOD_IPSTAT_INC(ips_toosmall);
3538                         goto bad;
3539                 }
3540         }
3541         ip = mtod(m, struct ip *);
3542         if (ip == NULL) goto bad;
3543
3544         if (ip->ip_v != IPVERSION) {
3545                 KMOD_IPSTAT_INC(ips_badvers);
3546                 goto bad;
3547         }
3548         hlen = ip->ip_hl << 2;
3549         if (hlen < sizeof(struct ip)) { /* minimum header length */
3550                 KMOD_IPSTAT_INC(ips_badhlen);
3551                 goto bad;
3552         }
3553         if (hlen > m->m_len) {
3554                 if ((m = m_pullup(m, hlen)) == NULL) {
3555                         KMOD_IPSTAT_INC(ips_badhlen);
3556                         goto bad;
3557                 }
3558                 ip = mtod(m, struct ip *);
3559                 if (ip == NULL) goto bad;
3560         }
3561
3562         if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3563                 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3564         } else {
3565                 if (hlen == sizeof(struct ip)) {
3566                         sum = in_cksum_hdr(ip);
3567                 } else {
3568                         sum = in_cksum(m, hlen);
3569                 }
3570         }
3571         if (sum) {
3572                 KMOD_IPSTAT_INC(ips_badsum);
3573                 goto bad;
3574         }
3575
3576         /* Retrieve the packet length. */
3577         len = ntohs(ip->ip_len);
3578
3579         /*
3580          * Check for additional length bogosity
3581          */
3582         if (len < hlen) {
3583                 KMOD_IPSTAT_INC(ips_badlen);
3584                 goto bad;
3585         }
3586
3587         /*
3588          * Check that the amount of data in the buffers
3589          * is as at least much as the IP header would have us expect.
3590          * Drop packet if shorter than we expect.
3591          */
3592         if (m->m_pkthdr.len < len) {
3593                 KMOD_IPSTAT_INC(ips_tooshort);
3594                 goto bad;
3595         }
3596
3597         /* Checks out, proceed */
3598         *mp = m;
3599         return (0);
3600
3601 bad:
3602         *mp = m;
3603         return (-1);
3604 }
3605
3606 #ifdef INET6
3607 /*
3608  * Same as above, but for IPv6.
3609  * Cut-and-pasted from ip6_input.c.
3610  * XXX Should we update ip6stat, or not?
3611  */
3612 static int
3613 bridge_ip6_checkbasic(struct mbuf **mp)
3614 {
3615         struct mbuf *m = *mp;
3616         struct ip6_hdr *ip6;
3617
3618         /*
3619          * If the IPv6 header is not aligned, slurp it up into a new
3620          * mbuf with space for link headers, in the event we forward
3621          * it.  Otherwise, if it is aligned, make sure the entire base
3622          * IPv6 header is in the first mbuf of the chain.
3623          */
3624         if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3625                 struct ifnet *inifp = m->m_pkthdr.rcvif;
3626                 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3627                             (max_linkhdr + 3) & ~3)) == NULL) {
3628                         /* XXXJRT new stat, please */
3629                         IP6STAT_INC(ip6s_toosmall);
3630                         in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3631                         goto bad;
3632                 }
3633         } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3634                 struct ifnet *inifp = m->m_pkthdr.rcvif;
3635                 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3636                         IP6STAT_INC(ip6s_toosmall);
3637                         in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3638                         goto bad;
3639                 }
3640         }
3641
3642         ip6 = mtod(m, struct ip6_hdr *);
3643
3644         if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3645                 IP6STAT_INC(ip6s_badvers);
3646                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3647                 goto bad;
3648         }
3649
3650         /* Checks out, proceed */
3651         *mp = m;
3652         return (0);
3653
3654 bad:
3655         *mp = m;
3656         return (-1);
3657 }
3658 #endif /* INET6 */
3659
3660 /*
3661  * bridge_fragment:
3662  *
3663  *      Fragment mbuf chain in multiple packets and prepend ethernet header.
3664  */
3665 static int
3666 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh,
3667     int snap, struct llc *llc)
3668 {
3669         struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL;
3670         struct ip *ip;
3671         int error = -1;
3672
3673         if (m->m_len < sizeof(struct ip) &&
3674             (m = m_pullup(m, sizeof(struct ip))) == NULL)
3675                 goto dropit;
3676         ip = mtod(m, struct ip *);
3677
3678         m->m_pkthdr.csum_flags |= CSUM_IP;
3679         error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist);
3680         if (error)
3681                 goto dropit;
3682
3683         /*
3684          * Walk the chain and re-add the Ethernet header for
3685          * each mbuf packet.
3686          */
3687         for (mcur = m; mcur; mcur = mcur->m_nextpkt) {
3688                 nextpkt = mcur->m_nextpkt;
3689                 mcur->m_nextpkt = NULL;
3690                 if (snap) {
3691                         M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT);
3692                         if (mcur == NULL) {
3693                                 error = ENOBUFS;
3694                                 if (mprev != NULL)
3695                                         mprev->m_nextpkt = nextpkt;
3696                                 goto dropit;
3697                         }
3698                         bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc));
3699                 }
3700
3701                 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT);
3702                 if (mcur == NULL) {
3703                         error = ENOBUFS;
3704                         if (mprev != NULL)
3705                                 mprev->m_nextpkt = nextpkt;
3706                         goto dropit;
3707                 }
3708                 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN);
3709
3710                 /*
3711                  * The previous two M_PREPEND could have inserted one or two
3712                  * mbufs in front so we have to update the previous packet's
3713                  * m_nextpkt.
3714                  */
3715                 mcur->m_nextpkt = nextpkt;
3716                 if (mprev != NULL)
3717                         mprev->m_nextpkt = mcur;
3718                 else {
3719                         /* The first mbuf in the original chain needs to be
3720                          * updated. */
3721                         *mp = mcur;
3722                 }
3723                 mprev = mcur;
3724         }
3725
3726         KMOD_IPSTAT_INC(ips_fragmented);
3727         return (error);
3728
3729 dropit:
3730         for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */
3731                 m = mcur->m_nextpkt;
3732                 m_freem(mcur);
3733         }
3734         return (error);
3735 }
3736
3737 static void
3738 bridge_linkstate(struct ifnet *ifp)
3739 {
3740         struct bridge_softc *sc = ifp->if_bridge;
3741         struct bridge_iflist *bif;
3742         struct epoch_tracker et;
3743
3744         NET_EPOCH_ENTER(et);
3745
3746         bif = bridge_lookup_member_if(sc, ifp);
3747         if (bif == NULL) {
3748                 NET_EPOCH_EXIT(et);
3749                 return;
3750         }
3751         bridge_linkcheck(sc);
3752
3753         bstp_linkstate(&bif->bif_stp);
3754
3755         NET_EPOCH_EXIT(et);
3756 }
3757
3758 static void
3759 bridge_linkcheck(struct bridge_softc *sc)
3760 {
3761         struct bridge_iflist *bif;
3762         int new_link, hasls;
3763
3764         BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
3765
3766         new_link = LINK_STATE_DOWN;
3767         hasls = 0;
3768         /* Our link is considered up if at least one of our ports is active */
3769         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
3770                 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
3771                         hasls++;
3772                 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
3773                         new_link = LINK_STATE_UP;
3774                         break;
3775                 }
3776         }
3777         if (!CK_LIST_EMPTY(&sc->sc_iflist) && !hasls) {
3778                 /* If no interfaces support link-state then we default to up */
3779                 new_link = LINK_STATE_UP;
3780         }
3781         if_link_state_change(sc->sc_ifp, new_link);
3782 }