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 accross 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                 if (ifr->ifr_mtu < 576) {
 936                         error = EINVAL;
 937                         break;
 938                 }
 939                 if (CK_LIST_EMPTY(&sc->sc_iflist)) {
 940                         sc->sc_ifp->if_mtu = ifr->ifr_mtu;
 941                         break;
 942                 }
 943                 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 944                         if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) {
 945                                 log(LOG_NOTICE, "%s: invalid MTU: %u(%s)"
 946                                     " != %d\n", sc->sc_ifp->if_xname,
 947                                     bif->bif_ifp->if_mtu,
 948                                     bif->bif_ifp->if_xname, ifr->ifr_mtu);
 949                                 error = EINVAL;
 950                                 break;
 951                         }
 952                 }
 953                 if (!error)
 954                         sc->sc_ifp->if_mtu = ifr->ifr_mtu;
 955                 break;
 956         default:
 957                 /*
 958                  * drop the lock as ether_ioctl() will call bridge_start() and
 959                  * cause the lock to be recursed.
 960                  */
 961                 BRIDGE_UNLOCK(sc);
 962                 error = ether_ioctl(ifp, cmd, data);
 963                 BRIDGE_LOCK(sc);
 964                 break;
 965         }
 966
 967         BRIDGE_UNLOCK(sc);
 968
 969         return (error);
 970 }
 971
 972 /*
 973  * bridge_mutecaps:
 974  *
 975  *      Clear or restore unwanted capabilities on the member interface
 976  */
 977 static void
 978 bridge_mutecaps(struct bridge_softc *sc)
 979 {
 980         struct bridge_iflist *bif;
 981         int enabled, mask;
 982
 983         BRIDGE_LOCK_ASSERT(sc);
 984
 985         /* Initial bitmask of capabilities to test */
 986         mask = BRIDGE_IFCAPS_MASK;
 987
 988         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 989                 /* Every member must support it or its disabled */
 990                 mask &= bif->bif_savedcaps;
 991         }
 992
 993         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 994                 enabled = bif->bif_ifp->if_capenable;
 995                 enabled &= ~BRIDGE_IFCAPS_STRIP;
 996                 /* strip off mask bits and enable them again if allowed */
 997                 enabled &= ~BRIDGE_IFCAPS_MASK;
 998                 enabled |= mask;
 999                 bridge_set_ifcap(sc, bif, enabled);
1000         }
1001 }
1002
1003 static void
1004 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
1005 {
1006         struct ifnet *ifp = bif->bif_ifp;
1007         struct ifreq ifr;
1008         int error, mask, stuck;
1009
1010         bzero(&ifr, sizeof(ifr));
1011         ifr.ifr_reqcap = set;
1012
1013         if (ifp->if_capenable != set) {
1014                 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
1015                 if (error)
1016                         if_printf(sc->sc_ifp,
1017                             "error setting capabilities on %s: %d\n",
1018                             ifp->if_xname, error);
1019                 mask = BRIDGE_IFCAPS_MASK | BRIDGE_IFCAPS_STRIP;
1020                 stuck = ifp->if_capenable & mask & ~set;
1021                 if (stuck != 0)
1022                         if_printf(sc->sc_ifp,
1023                             "can't disable some capabilities on %s: 0x%x\n",
1024                             ifp->if_xname, stuck);
1025         }
1026 }
1027
1028 /*
1029  * bridge_lookup_member:
1030  *
1031  *      Lookup a bridge member interface.
1032  */
1033 static struct bridge_iflist *
1034 bridge_lookup_member(struct bridge_softc *sc, const char *name)
1035 {
1036         struct bridge_iflist *bif;
1037         struct ifnet *ifp;
1038
1039         BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
1040
1041         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1042                 ifp = bif->bif_ifp;
1043                 if (strcmp(ifp->if_xname, name) == 0)
1044                         return (bif);
1045         }
1046
1047         return (NULL);
1048 }
1049
1050 /*
1051  * bridge_lookup_member_if:
1052  *
1053  *      Lookup a bridge member interface by ifnet*.
1054  */
1055 static struct bridge_iflist *
1056 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
1057 {
1058         struct bridge_iflist *bif;
1059
1060         BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
1061
1062         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1063                 if (bif->bif_ifp == member_ifp)
1064                         return (bif);
1065         }
1066
1067         return (NULL);
1068 }
1069
1070 static void
1071 bridge_delete_member_cb(struct epoch_context *ctx)
1072 {
1073         struct bridge_iflist *bif;
1074
1075         bif = __containerof(ctx, struct bridge_iflist, bif_epoch_ctx);
1076
1077         free(bif, M_DEVBUF);
1078 }
1079
1080 /*
1081  * bridge_delete_member:
1082  *
1083  *      Delete the specified member interface.
1084  */
1085 static void
1086 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
1087     int gone)
1088 {
1089         struct ifnet *ifs = bif->bif_ifp;
1090         struct ifnet *fif = NULL;
1091         struct bridge_iflist *bifl;
1092
1093         BRIDGE_LOCK_ASSERT(sc);
1094
1095         if (bif->bif_flags & IFBIF_STP)
1096                 bstp_disable(&bif->bif_stp);
1097
1098         ifs->if_bridge = NULL;
1099         CK_LIST_REMOVE(bif, bif_next);
1100
1101         /*
1102          * If removing the interface that gave the bridge its mac address, set
1103          * the mac address of the bridge to the address of the next member, or
1104          * to its default address if no members are left.
1105          */
1106         if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) {
1107                 if (CK_LIST_EMPTY(&sc->sc_iflist)) {
1108                         bcopy(&sc->sc_defaddr,
1109                             IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1110                         sc->sc_ifaddr = NULL;
1111                 } else {
1112                         bifl = CK_LIST_FIRST(&sc->sc_iflist);
1113                         fif = bifl->bif_ifp;
1114                         bcopy(IF_LLADDR(fif),
1115                             IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1116                         sc->sc_ifaddr = fif;
1117                 }
1118                 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1119         }
1120
1121         bridge_linkcheck(sc);
1122         bridge_mutecaps(sc);    /* recalcuate now this interface is removed */
1123         BRIDGE_RT_LOCK(sc);
1124         bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
1125         BRIDGE_RT_UNLOCK(sc);
1126         KASSERT(bif->bif_addrcnt == 0,
1127             ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
1128
1129         ifs->if_bridge_output = NULL;
1130         ifs->if_bridge_input = NULL;
1131         ifs->if_bridge_linkstate = NULL;
1132         if (!gone) {
1133                 switch (ifs->if_type) {
1134                 case IFT_ETHER:
1135                 case IFT_L2VLAN:
1136                         /*
1137                          * Take the interface out of promiscuous mode, but only
1138                          * if it was promiscuous in the first place. It might
1139                          * not be if we're in the bridge_ioctl_add() error path.
1140                          */
1141                         if (ifs->if_flags & IFF_PROMISC)
1142                                 (void) ifpromisc(ifs, 0);
1143                         break;
1144
1145                 case IFT_GIF:
1146                         break;
1147
1148                 default:
1149 #ifdef DIAGNOSTIC
1150                         panic("bridge_delete_member: impossible");
1151 #endif
1152                         break;
1153                 }
1154                 /* reneable any interface capabilities */
1155                 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
1156         }
1157         bstp_destroy(&bif->bif_stp);    /* prepare to free */
1158
1159         NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx);
1160 }
1161
1162 /*
1163  * bridge_delete_span:
1164  *
1165  *      Delete the specified span interface.
1166  */
1167 static void
1168 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1169 {
1170         BRIDGE_LOCK_ASSERT(sc);
1171
1172         KASSERT(bif->bif_ifp->if_bridge == NULL,
1173             ("%s: not a span interface", __func__));
1174
1175         CK_LIST_REMOVE(bif, bif_next);
1176
1177         NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx);
1178 }
1179
1180 static int
1181 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1182 {
1183         struct ifbreq *req = arg;
1184         struct bridge_iflist *bif = NULL;
1185         struct ifnet *ifs;
1186         int error = 0;
1187
1188         ifs = ifunit(req->ifbr_ifsname);
1189         if (ifs == NULL)
1190                 return (ENOENT);
1191         if (ifs->if_ioctl == NULL)      /* must be supported */
1192                 return (EINVAL);
1193
1194         /* If it's in the span list, it can't be a member. */
1195         CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1196                 if (ifs == bif->bif_ifp)
1197                         return (EBUSY);
1198
1199         if (ifs->if_bridge == sc)
1200                 return (EEXIST);
1201
1202         if (ifs->if_bridge != NULL)
1203                 return (EBUSY);
1204
1205         switch (ifs->if_type) {
1206         case IFT_ETHER:
1207         case IFT_L2VLAN:
1208         case IFT_GIF:
1209                 /* permitted interface types */
1210                 break;
1211         default:
1212                 return (EINVAL);
1213         }
1214
1215 #ifdef INET6
1216         /*
1217          * Two valid inet6 addresses with link-local scope must not be
1218          * on the parent interface and the member interfaces at the
1219          * same time.  This restriction is needed to prevent violation
1220          * of link-local scope zone.  Attempts to add a member
1221          * interface which has inet6 addresses when the parent has
1222          * inet6 triggers removal of all inet6 addresses on the member
1223          * interface.
1224          */
1225
1226         /* Check if the parent interface has a link-local scope addr. */
1227         if (V_allow_llz_overlap == 0 &&
1228             in6ifa_llaonifp(sc->sc_ifp) != NULL) {
1229                 /*
1230                  * If any, remove all inet6 addresses from the member
1231                  * interfaces.
1232                  */
1233                 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1234                         if (in6ifa_llaonifp(bif->bif_ifp)) {
1235                                 in6_ifdetach(bif->bif_ifp);
1236                                 if_printf(sc->sc_ifp,
1237                                     "IPv6 addresses on %s have been removed "
1238                                     "before adding it as a member to prevent "
1239                                     "IPv6 address scope violation.\n",
1240                                     bif->bif_ifp->if_xname);
1241                         }
1242                 }
1243                 if (in6ifa_llaonifp(ifs)) {
1244                         in6_ifdetach(ifs);
1245                         if_printf(sc->sc_ifp,
1246                             "IPv6 addresses on %s have been removed "
1247                             "before adding it as a member to prevent "
1248                             "IPv6 address scope violation.\n",
1249                             ifs->if_xname);
1250                 }
1251         }
1252 #endif
1253         /* Allow the first Ethernet member to define the MTU */
1254         if (CK_LIST_EMPTY(&sc->sc_iflist))
1255                 sc->sc_ifp->if_mtu = ifs->if_mtu;
1256         else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
1257                 if_printf(sc->sc_ifp, "invalid MTU: %u(%s) != %u\n",
1258                     ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu);
1259                 return (EINVAL);
1260         }
1261
1262         bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1263         if (bif == NULL)
1264                 return (ENOMEM);
1265
1266         bif->bif_ifp = ifs;
1267         bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1268         bif->bif_savedcaps = ifs->if_capenable;
1269
1270         /*
1271          * Assign the interface's MAC address to the bridge if it's the first
1272          * member and the MAC address of the bridge has not been changed from
1273          * the default randomly generated one.
1274          */
1275         if (V_bridge_inherit_mac && CK_LIST_EMPTY(&sc->sc_iflist) &&
1276             !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) {
1277                 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1278                 sc->sc_ifaddr = ifs;
1279                 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1280         }
1281
1282         ifs->if_bridge = sc;
1283         ifs->if_bridge_output = bridge_output;
1284         ifs->if_bridge_input = bridge_input;
1285         ifs->if_bridge_linkstate = bridge_linkstate;
1286         bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1287         /*
1288          * XXX: XLOCK HERE!?!
1289          *
1290          * NOTE: insert_***HEAD*** should be safe for the traversals.
1291          */
1292         CK_LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1293
1294         /* Set interface capabilities to the intersection set of all members */
1295         bridge_mutecaps(sc);
1296         bridge_linkcheck(sc);
1297
1298         /* Place the interface into promiscuous mode */
1299         switch (ifs->if_type) {
1300                 case IFT_ETHER:
1301                 case IFT_L2VLAN:
1302                         error = ifpromisc(ifs, 1);
1303                         break;
1304         }
1305
1306         if (error)
1307                 bridge_delete_member(sc, bif, 0);
1308         return (error);
1309 }
1310
1311 static int
1312 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1313 {
1314         struct ifbreq *req = arg;
1315         struct bridge_iflist *bif;
1316
1317         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1318         if (bif == NULL)
1319                 return (ENOENT);
1320
1321         bridge_delete_member(sc, bif, 0);
1322
1323         return (0);
1324 }
1325
1326 static int
1327 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1328 {
1329         struct ifbreq *req = arg;
1330         struct bridge_iflist *bif;
1331         struct bstp_port *bp;
1332
1333         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1334         if (bif == NULL)
1335                 return (ENOENT);
1336
1337         bp = &bif->bif_stp;
1338         req->ifbr_ifsflags = bif->bif_flags;
1339         req->ifbr_state = bp->bp_state;
1340         req->ifbr_priority = bp->bp_priority;
1341         req->ifbr_path_cost = bp->bp_path_cost;
1342         req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1343         req->ifbr_proto = bp->bp_protover;
1344         req->ifbr_role = bp->bp_role;
1345         req->ifbr_stpflags = bp->bp_flags;
1346         req->ifbr_addrcnt = bif->bif_addrcnt;
1347         req->ifbr_addrmax = bif->bif_addrmax;
1348         req->ifbr_addrexceeded = bif->bif_addrexceeded;
1349
1350         /* Copy STP state options as flags */
1351         if (bp->bp_operedge)
1352                 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1353         if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1354                 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1355         if (bp->bp_ptp_link)
1356                 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1357         if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1358                 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1359         if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1360                 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1361         if (bp->bp_flags & BSTP_PORT_ADMCOST)
1362                 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1363         return (0);
1364 }
1365
1366 static int
1367 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1368 {
1369         struct epoch_tracker et;
1370         struct ifbreq *req = arg;
1371         struct bridge_iflist *bif;
1372         struct bstp_port *bp;
1373         int error;
1374
1375         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1376         if (bif == NULL)
1377                 return (ENOENT);
1378         bp = &bif->bif_stp;
1379
1380         if (req->ifbr_ifsflags & IFBIF_SPAN)
1381                 /* SPAN is readonly */
1382                 return (EINVAL);
1383
1384         NET_EPOCH_ENTER(et);
1385
1386         if (req->ifbr_ifsflags & IFBIF_STP) {
1387                 if ((bif->bif_flags & IFBIF_STP) == 0) {
1388                         error = bstp_enable(&bif->bif_stp);
1389                         if (error) {
1390                                 NET_EPOCH_EXIT(et);
1391                                 return (error);
1392                         }
1393                 }
1394         } else {
1395                 if ((bif->bif_flags & IFBIF_STP) != 0)
1396                         bstp_disable(&bif->bif_stp);
1397         }
1398
1399         /* Pass on STP flags */
1400         bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1401         bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1402         bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1403         bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1404
1405         /* Save the bits relating to the bridge */
1406         bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1407
1408         NET_EPOCH_EXIT(et);
1409
1410         return (0);
1411 }
1412
1413 static int
1414 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1415 {
1416         struct ifbrparam *param = arg;
1417
1418         sc->sc_brtmax = param->ifbrp_csize;
1419         bridge_rttrim(sc);
1420
1421         return (0);
1422 }
1423
1424 static int
1425 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1426 {
1427         struct ifbrparam *param = arg;
1428
1429         param->ifbrp_csize = sc->sc_brtmax;
1430
1431         return (0);
1432 }
1433
1434 static int
1435 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1436 {
1437         struct ifbifconf *bifc = arg;
1438         struct bridge_iflist *bif;
1439         struct ifbreq breq;
1440         char *buf, *outbuf;
1441         int count, buflen, len, error = 0;
1442
1443         count = 0;
1444         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1445                 count++;
1446         CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1447                 count++;
1448
1449         buflen = sizeof(breq) * count;
1450         if (bifc->ifbic_len == 0) {
1451                 bifc->ifbic_len = buflen;
1452                 return (0);
1453         }
1454         outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO);
1455         if (outbuf == NULL)
1456                 return (ENOMEM);
1457
1458         count = 0;
1459         buf = outbuf;
1460         len = min(bifc->ifbic_len, buflen);
1461         bzero(&breq, sizeof(breq));
1462         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1463                 if (len < sizeof(breq))
1464                         break;
1465
1466                 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1467                     sizeof(breq.ifbr_ifsname));
1468                 /* Fill in the ifbreq structure */
1469                 error = bridge_ioctl_gifflags(sc, &breq);
1470                 if (error)
1471                         break;
1472                 memcpy(buf, &breq, sizeof(breq));
1473                 count++;
1474                 buf += sizeof(breq);
1475                 len -= sizeof(breq);
1476         }
1477         CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1478                 if (len < sizeof(breq))
1479                         break;
1480
1481                 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1482                     sizeof(breq.ifbr_ifsname));
1483                 breq.ifbr_ifsflags = bif->bif_flags;
1484                 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1485                 memcpy(buf, &breq, sizeof(breq));
1486                 count++;
1487                 buf += sizeof(breq);
1488                 len -= sizeof(breq);
1489         }
1490
1491         bifc->ifbic_len = sizeof(breq) * count;
1492         error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1493         free(outbuf, M_TEMP);
1494         return (error);
1495 }
1496
1497 static int
1498 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1499 {
1500         struct ifbaconf *bac = arg;
1501         struct bridge_rtnode *brt;
1502         struct ifbareq bareq;
1503         char *buf, *outbuf;
1504         int count, buflen, len, error = 0;
1505
1506         if (bac->ifbac_len == 0)
1507                 return (0);
1508
1509         count = 0;
1510         CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1511                 count++;
1512         buflen = sizeof(bareq) * count;
1513
1514         outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO);
1515         if (outbuf == NULL)
1516                 return (ENOMEM);
1517
1518         count = 0;
1519         buf = outbuf;
1520         len = min(bac->ifbac_len, buflen);
1521         bzero(&bareq, sizeof(bareq));
1522         CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1523                 if (len < sizeof(bareq))
1524                         goto out;
1525                 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1526                     sizeof(bareq.ifba_ifsname));
1527                 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1528                 bareq.ifba_vlan = brt->brt_vlan;
1529                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1530                                 time_uptime < brt->brt_expire)
1531                         bareq.ifba_expire = brt->brt_expire - time_uptime;
1532                 else
1533                         bareq.ifba_expire = 0;
1534                 bareq.ifba_flags = brt->brt_flags;
1535
1536                 memcpy(buf, &bareq, sizeof(bareq));
1537                 count++;
1538                 buf += sizeof(bareq);
1539                 len -= sizeof(bareq);
1540         }
1541 out:
1542         bac->ifbac_len = sizeof(bareq) * count;
1543         error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1544         free(outbuf, M_TEMP);
1545         return (error);
1546 }
1547
1548 static int
1549 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1550 {
1551         struct ifbareq *req = arg;
1552         struct bridge_iflist *bif;
1553         struct epoch_tracker et;
1554         int error;
1555
1556         NET_EPOCH_ENTER(et);
1557         bif = bridge_lookup_member(sc, req->ifba_ifsname);
1558         if (bif == NULL) {
1559                 NET_EPOCH_EXIT(et);
1560                 return (ENOENT);
1561         }
1562
1563         /* bridge_rtupdate() may acquire the lock. */
1564         error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1565             req->ifba_flags);
1566         NET_EPOCH_EXIT(et);
1567
1568         return (error);
1569 }
1570
1571 static int
1572 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1573 {
1574         struct ifbrparam *param = arg;
1575
1576         sc->sc_brttimeout = param->ifbrp_ctime;
1577         return (0);
1578 }
1579
1580 static int
1581 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1582 {
1583         struct ifbrparam *param = arg;
1584
1585         param->ifbrp_ctime = sc->sc_brttimeout;
1586         return (0);
1587 }
1588
1589 static int
1590 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1591 {
1592         struct ifbareq *req = arg;
1593
1594         return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
1595 }
1596
1597 static int
1598 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1599 {
1600         struct ifbreq *req = arg;
1601
1602         BRIDGE_RT_LOCK(sc);
1603         bridge_rtflush(sc, req->ifbr_ifsflags);
1604         BRIDGE_RT_UNLOCK(sc);
1605
1606         return (0);
1607 }
1608
1609 static int
1610 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1611 {
1612         struct ifbrparam *param = arg;
1613         struct bstp_state *bs = &sc->sc_stp;
1614
1615         param->ifbrp_prio = bs->bs_bridge_priority;
1616         return (0);
1617 }
1618
1619 static int
1620 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1621 {
1622         struct ifbrparam *param = arg;
1623
1624         return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1625 }
1626
1627 static int
1628 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1629 {
1630         struct ifbrparam *param = arg;
1631         struct bstp_state *bs = &sc->sc_stp;
1632
1633         param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1634         return (0);
1635 }
1636
1637 static int
1638 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1639 {
1640         struct ifbrparam *param = arg;
1641
1642         return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1643 }
1644
1645 static int
1646 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1647 {
1648         struct ifbrparam *param = arg;
1649         struct bstp_state *bs = &sc->sc_stp;
1650
1651         param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1652         return (0);
1653 }
1654
1655 static int
1656 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1657 {
1658         struct ifbrparam *param = arg;
1659
1660         return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1661 }
1662
1663 static int
1664 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1665 {
1666         struct ifbrparam *param = arg;
1667         struct bstp_state *bs = &sc->sc_stp;
1668
1669         param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1670         return (0);
1671 }
1672
1673 static int
1674 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1675 {
1676         struct ifbrparam *param = arg;
1677
1678         return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1679 }
1680
1681 static int
1682 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1683 {
1684         struct ifbreq *req = arg;
1685         struct bridge_iflist *bif;
1686
1687         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1688         if (bif == NULL)
1689                 return (ENOENT);
1690
1691         return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1692 }
1693
1694 static int
1695 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1696 {
1697         struct ifbreq *req = arg;
1698         struct bridge_iflist *bif;
1699
1700         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1701         if (bif == NULL)
1702                 return (ENOENT);
1703
1704         return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1705 }
1706
1707 static int
1708 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1709 {
1710         struct ifbreq *req = arg;
1711         struct bridge_iflist *bif;
1712
1713         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1714         if (bif == NULL)
1715                 return (ENOENT);
1716
1717         bif->bif_addrmax = req->ifbr_addrmax;
1718         return (0);
1719 }
1720
1721 static int
1722 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1723 {
1724         struct ifbreq *req = arg;
1725         struct bridge_iflist *bif = NULL;
1726         struct ifnet *ifs;
1727
1728         ifs = ifunit(req->ifbr_ifsname);
1729         if (ifs == NULL)
1730                 return (ENOENT);
1731
1732         CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1733                 if (ifs == bif->bif_ifp)
1734                         return (EBUSY);
1735
1736         if (ifs->if_bridge != NULL)
1737                 return (EBUSY);
1738
1739         switch (ifs->if_type) {
1740                 case IFT_ETHER:
1741                 case IFT_GIF:
1742                 case IFT_L2VLAN:
1743                         break;
1744                 default:
1745                         return (EINVAL);
1746         }
1747
1748         bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1749         if (bif == NULL)
1750                 return (ENOMEM);
1751
1752         bif->bif_ifp = ifs;
1753         bif->bif_flags = IFBIF_SPAN;
1754
1755         CK_LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1756
1757         return (0);
1758 }
1759
1760 static int
1761 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1762 {
1763         struct ifbreq *req = arg;
1764         struct bridge_iflist *bif;
1765         struct ifnet *ifs;
1766
1767         ifs = ifunit(req->ifbr_ifsname);
1768         if (ifs == NULL)
1769                 return (ENOENT);
1770
1771         CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1772                 if (ifs == bif->bif_ifp)
1773                         break;
1774
1775         if (bif == NULL)
1776                 return (ENOENT);
1777
1778         bridge_delete_span(sc, bif);
1779
1780         return (0);
1781 }
1782
1783 static int
1784 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1785 {
1786         struct ifbropreq *req = arg;
1787         struct bstp_state *bs = &sc->sc_stp;
1788         struct bstp_port *root_port;
1789
1790         req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1791         req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1792         req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1793
1794         root_port = bs->bs_root_port;
1795         if (root_port == NULL)
1796                 req->ifbop_root_port = 0;
1797         else
1798                 req->ifbop_root_port = root_port->bp_ifp->if_index;
1799
1800         req->ifbop_holdcount = bs->bs_txholdcount;
1801         req->ifbop_priority = bs->bs_bridge_priority;
1802         req->ifbop_protocol = bs->bs_protover;
1803         req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1804         req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1805         req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1806         req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1807         req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1808         req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1809
1810         return (0);
1811 }
1812
1813 static int
1814 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1815 {
1816         struct ifbrparam *param = arg;
1817
1818         param->ifbrp_cexceeded = sc->sc_brtexceeded;
1819         return (0);
1820 }
1821
1822 static int
1823 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1824 {
1825         struct ifbpstpconf *bifstp = arg;
1826         struct bridge_iflist *bif;
1827         struct bstp_port *bp;
1828         struct ifbpstpreq bpreq;
1829         char *buf, *outbuf;
1830         int count, buflen, len, error = 0;
1831
1832         count = 0;
1833         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1834                 if ((bif->bif_flags & IFBIF_STP) != 0)
1835                         count++;
1836         }
1837
1838         buflen = sizeof(bpreq) * count;
1839         if (bifstp->ifbpstp_len == 0) {
1840                 bifstp->ifbpstp_len = buflen;
1841                 return (0);
1842         }
1843
1844         outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO);
1845         if (outbuf == NULL)
1846                 return (ENOMEM);
1847
1848         count = 0;
1849         buf = outbuf;
1850         len = min(bifstp->ifbpstp_len, buflen);
1851         bzero(&bpreq, sizeof(bpreq));
1852         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1853                 if (len < sizeof(bpreq))
1854                         break;
1855
1856                 if ((bif->bif_flags & IFBIF_STP) == 0)
1857                         continue;
1858
1859                 bp = &bif->bif_stp;
1860                 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1861                 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1862                 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1863                 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1864                 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1865                 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1866
1867                 memcpy(buf, &bpreq, sizeof(bpreq));
1868                 count++;
1869                 buf += sizeof(bpreq);
1870                 len -= sizeof(bpreq);
1871         }
1872
1873         bifstp->ifbpstp_len = sizeof(bpreq) * count;
1874         error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1875         free(outbuf, M_TEMP);
1876         return (error);
1877 }
1878
1879 static int
1880 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1881 {
1882         struct ifbrparam *param = arg;
1883
1884         return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1885 }
1886
1887 static int
1888 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1889 {
1890         struct ifbrparam *param = arg;
1891
1892         return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1893 }
1894
1895 /*
1896  * bridge_ifdetach:
1897  *
1898  *      Detach an interface from a bridge.  Called when a member
1899  *      interface is detaching.
1900  */
1901 static void
1902 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1903 {
1904         struct bridge_softc *sc = ifp->if_bridge;
1905         struct bridge_iflist *bif;
1906
1907         if (ifp->if_flags & IFF_RENAMING)
1908                 return;
1909         if (V_bridge_cloner == NULL) {
1910                 /*
1911                  * This detach handler can be called after
1912                  * vnet_bridge_uninit().  Just return in that case.
1913                  */
1914                 return;
1915         }
1916         /* Check if the interface is a bridge member */
1917         if (sc != NULL) {
1918                 BRIDGE_LOCK(sc);
1919
1920                 bif = bridge_lookup_member_if(sc, ifp);
1921                 if (bif != NULL)
1922                         bridge_delete_member(sc, bif, 1);
1923
1924                 BRIDGE_UNLOCK(sc);
1925                 return;
1926         }
1927
1928         /* Check if the interface is a span port */
1929         BRIDGE_LIST_LOCK();
1930         LIST_FOREACH(sc, &V_bridge_list, sc_list) {
1931                 BRIDGE_LOCK(sc);
1932                 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1933                         if (ifp == bif->bif_ifp) {
1934                                 bridge_delete_span(sc, bif);
1935                                 break;
1936                         }
1937
1938                 BRIDGE_UNLOCK(sc);
1939         }
1940         BRIDGE_LIST_UNLOCK();
1941 }
1942
1943 /*
1944  * bridge_init:
1945  *
1946  *      Initialize a bridge interface.
1947  */
1948 static void
1949 bridge_init(void *xsc)
1950 {
1951         struct bridge_softc *sc = (struct bridge_softc *)xsc;
1952         struct ifnet *ifp = sc->sc_ifp;
1953
1954         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1955                 return;
1956
1957         BRIDGE_LOCK(sc);
1958         callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1959             bridge_timer, sc);
1960
1961         ifp->if_drv_flags |= IFF_DRV_RUNNING;
1962         bstp_init(&sc->sc_stp);         /* Initialize Spanning Tree */
1963
1964         BRIDGE_UNLOCK(sc);
1965 }
1966
1967 /*
1968  * bridge_stop:
1969  *
1970  *      Stop the bridge interface.
1971  */
1972 static void
1973 bridge_stop(struct ifnet *ifp, int disable)
1974 {
1975         struct bridge_softc *sc = ifp->if_softc;
1976
1977         BRIDGE_LOCK_ASSERT(sc);
1978
1979         if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1980                 return;
1981
1982         BRIDGE_RT_LOCK(sc);
1983         callout_stop(&sc->sc_brcallout);
1984
1985         bstp_stop(&sc->sc_stp);
1986
1987         bridge_rtflush(sc, IFBF_FLUSHDYN);
1988         BRIDGE_RT_UNLOCK(sc);
1989
1990         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1991 }
1992
1993 /*
1994  * bridge_enqueue:
1995  *
1996  *      Enqueue a packet on a bridge member interface.
1997  *
1998  */
1999 static int
2000 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
2001 {
2002         int len, err = 0;
2003         short mflags;
2004         struct mbuf *m0;
2005
2006         /* We may be sending a fragment so traverse the mbuf */
2007         for (; m; m = m0) {
2008                 m0 = m->m_nextpkt;
2009                 m->m_nextpkt = NULL;
2010                 len = m->m_pkthdr.len;
2011                 mflags = m->m_flags;
2012
2013                 /*
2014                  * If underlying interface can not do VLAN tag insertion itself
2015                  * then attach a packet tag that holds it.
2016                  */
2017                 if ((m->m_flags & M_VLANTAG) &&
2018                     (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
2019                         m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
2020                         if (m == NULL) {
2021                                 if_printf(dst_ifp,
2022                                     "unable to prepend VLAN header\n");
2023                                 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1);
2024                                 continue;
2025                         }
2026                         m->m_flags &= ~M_VLANTAG;
2027                 }
2028
2029                 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */
2030                 if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
2031                         m_freem(m0);
2032                         if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2033                         break;
2034                 }
2035
2036                 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1);
2037                 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len);
2038                 if (mflags & M_MCAST)
2039                         if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1);
2040         }
2041
2042         return (err);
2043 }
2044
2045 /*
2046  * bridge_dummynet:
2047  *
2048  *      Receive a queued packet from dummynet and pass it on to the output
2049  *      interface.
2050  *
2051  *      The mbuf has the Ethernet header already attached.
2052  */
2053 static void
2054 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
2055 {
2056         struct bridge_softc *sc;
2057
2058         sc = ifp->if_bridge;
2059
2060         /*
2061          * The packet didnt originate from a member interface. This should only
2062          * ever happen if a member interface is removed while packets are
2063          * queued for it.
2064          */
2065         if (sc == NULL) {
2066                 m_freem(m);
2067                 return;
2068         }
2069
2070         if (PFIL_HOOKED_OUT(V_inet_pfil_head)
2071 #ifdef INET6
2072             || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2073 #endif
2074             ) {
2075                 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
2076                         return;
2077                 if (m == NULL)
2078                         return;
2079         }
2080
2081         bridge_enqueue(sc, ifp, m);
2082 }
2083
2084 /*
2085  * bridge_output:
2086  *
2087  *      Send output from a bridge member interface.  This
2088  *      performs the bridging function for locally originated
2089  *      packets.
2090  *
2091  *      The mbuf has the Ethernet header already attached.  We must
2092  *      enqueue or free the mbuf before returning.
2093  */
2094 static int
2095 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
2096     struct rtentry *rt)
2097 {
2098         struct ether_header *eh;
2099         struct ifnet *bifp, *dst_if;
2100         struct bridge_softc *sc;
2101         uint16_t vlan;
2102
2103         NET_EPOCH_ASSERT();
2104
2105         if (m->m_len < ETHER_HDR_LEN) {
2106                 m = m_pullup(m, ETHER_HDR_LEN);
2107                 if (m == NULL)
2108                         return (0);
2109         }
2110
2111         eh = mtod(m, struct ether_header *);
2112         sc = ifp->if_bridge;
2113         vlan = VLANTAGOF(m);
2114
2115         bifp = sc->sc_ifp;
2116
2117         /*
2118          * If bridge is down, but the original output interface is up,
2119          * go ahead and send out that interface.  Otherwise, the packet
2120          * is dropped below.
2121          */
2122         if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2123                 dst_if = ifp;
2124                 goto sendunicast;
2125         }
2126
2127         /*
2128          * If the packet is a multicast, or we don't know a better way to
2129          * get there, send to all interfaces.
2130          */
2131         if (ETHER_IS_MULTICAST(eh->ether_dhost))
2132                 dst_if = NULL;
2133         else
2134                 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
2135         /* Tap any traffic not passing back out the originating interface */
2136         if (dst_if != ifp)
2137                 ETHER_BPF_MTAP(bifp, m);
2138         if (dst_if == NULL) {
2139                 struct bridge_iflist *bif;
2140                 struct mbuf *mc;
2141                 int used = 0;
2142
2143                 bridge_span(sc, m);
2144
2145                 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
2146                         dst_if = bif->bif_ifp;
2147
2148                         if (dst_if->if_type == IFT_GIF)
2149                                 continue;
2150                         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2151                                 continue;
2152
2153                         /*
2154                          * If this is not the original output interface,
2155                          * and the interface is participating in spanning
2156                          * tree, make sure the port is in a state that
2157                          * allows forwarding.
2158                          */
2159                         if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
2160                             bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2161                                 continue;
2162
2163                         if (CK_LIST_NEXT(bif, bif_next) == NULL) {
2164                                 used = 1;
2165                                 mc = m;
2166                         } else {
2167                                 mc = m_copypacket(m, M_NOWAIT);
2168                                 if (mc == NULL) {
2169                                         if_inc_counter(bifp, IFCOUNTER_OERRORS, 1);
2170                                         continue;
2171                                 }
2172                         }
2173
2174                         bridge_enqueue(sc, dst_if, mc);
2175                 }
2176                 if (used == 0)
2177                         m_freem(m);
2178                 return (0);
2179         }
2180
2181 sendunicast:
2182         /*
2183          * XXX Spanning tree consideration here?
2184          */
2185
2186         bridge_span(sc, m);
2187         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2188                 m_freem(m);
2189                 return (0);
2190         }
2191
2192         bridge_enqueue(sc, dst_if, m);
2193         return (0);
2194 }
2195
2196 /*
2197  * bridge_transmit:
2198  *
2199  *      Do output on a bridge.
2200  *
2201  */
2202 static int
2203 bridge_transmit(struct ifnet *ifp, struct mbuf *m)
2204 {
2205         struct bridge_softc *sc;
2206         struct ether_header *eh;
2207         struct ifnet *dst_if;
2208         int error = 0;
2209
2210         sc = ifp->if_softc;
2211
2212         ETHER_BPF_MTAP(ifp, m);
2213
2214         eh = mtod(m, struct ether_header *);
2215
2216         if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) &&
2217             (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) {
2218                 error = bridge_enqueue(sc, dst_if, m);
2219         } else
2220                 bridge_broadcast(sc, ifp, m, 0);
2221
2222         return (error);
2223 }
2224
2225 #ifdef ALTQ
2226 static void
2227 bridge_altq_start(if_t ifp)
2228 {
2229         struct ifaltq *ifq = &ifp->if_snd;
2230         struct mbuf *m;
2231
2232         IFQ_LOCK(ifq);
2233         IFQ_DEQUEUE_NOLOCK(ifq, m);
2234         while (m != NULL) {
2235                 bridge_transmit(ifp, m);
2236                 IFQ_DEQUEUE_NOLOCK(ifq, m);
2237         }
2238         IFQ_UNLOCK(ifq);
2239 }
2240
2241 static int
2242 bridge_altq_transmit(if_t ifp, struct mbuf *m)
2243 {
2244         int err;
2245
2246         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
2247                 IFQ_ENQUEUE(&ifp->if_snd, m, err);
2248                 if (err == 0)
2249                         bridge_altq_start(ifp);
2250         } else
2251                 err = bridge_transmit(ifp, m);
2252
2253         return (err);
2254 }
2255 #endif  /* ALTQ */
2256
2257 /*
2258  * The ifp->if_qflush entry point for if_bridge(4) is no-op.
2259  */
2260 static void
2261 bridge_qflush(struct ifnet *ifp __unused)
2262 {
2263 }
2264
2265 /*
2266  * bridge_forward:
2267  *
2268  *      The forwarding function of the bridge.
2269  *
2270  *      NOTE: Releases the lock on return.
2271  */
2272 static void
2273 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
2274     struct mbuf *m)
2275 {
2276         struct bridge_iflist *dbif;
2277         struct ifnet *src_if, *dst_if, *ifp;
2278         struct ether_header *eh;
2279         uint16_t vlan;
2280         uint8_t *dst;
2281         int error;
2282
2283         NET_EPOCH_ASSERT();
2284
2285         src_if = m->m_pkthdr.rcvif;
2286         ifp = sc->sc_ifp;
2287
2288         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
2289         if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2290         vlan = VLANTAGOF(m);
2291
2292         if ((sbif->bif_flags & IFBIF_STP) &&
2293             sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2294                 goto drop;
2295
2296         eh = mtod(m, struct ether_header *);
2297         dst = eh->ether_dhost;
2298
2299         /* If the interface is learning, record the address. */
2300         if (sbif->bif_flags & IFBIF_LEARNING) {
2301                 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2302                     sbif, 0, IFBAF_DYNAMIC);
2303                 /*
2304                  * If the interface has addresses limits then deny any source
2305                  * that is not in the cache.
2306                  */
2307                 if (error && sbif->bif_addrmax)
2308                         goto drop;
2309         }
2310
2311         if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2312             sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2313                 goto drop;
2314
2315         /*
2316          * At this point, the port either doesn't participate
2317          * in spanning tree or it is in the forwarding state.
2318          */
2319
2320         /*
2321          * If the packet is unicast, destined for someone on
2322          * "this" side of the bridge, drop it.
2323          */
2324         if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2325                 dst_if = bridge_rtlookup(sc, dst, vlan);
2326                 if (src_if == dst_if)
2327                         goto drop;
2328         } else {
2329                 /*
2330                  * Check if its a reserved multicast address, any address
2331                  * listed in 802.1D section 7.12.6 may not be forwarded by the
2332                  * bridge.
2333                  * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2334                  */
2335                 if (dst[0] == 0x01 && dst[1] == 0x80 &&
2336                     dst[2] == 0xc2 && dst[3] == 0x00 &&
2337                     dst[4] == 0x00 && dst[5] <= 0x0f)
2338                         goto drop;
2339
2340                 /* ...forward it to all interfaces. */
2341                 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
2342                 dst_if = NULL;
2343         }
2344
2345         /*
2346          * If we have a destination interface which is a member of our bridge,
2347          * OR this is a unicast packet, push it through the bpf(4) machinery.
2348          * For broadcast or multicast packets, don't bother because it will
2349          * be reinjected into ether_input. We do this before we pass the packets
2350          * through the pfil(9) framework, as it is possible that pfil(9) will
2351          * drop the packet, or possibly modify it, making it difficult to debug
2352          * firewall issues on the bridge.
2353          */
2354         if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2355                 ETHER_BPF_MTAP(ifp, m);
2356
2357         /* run the packet filter */
2358         if (PFIL_HOOKED_IN(V_inet_pfil_head)
2359 #ifdef INET6
2360             || PFIL_HOOKED_IN(V_inet6_pfil_head)
2361 #endif
2362             ) {
2363                 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2364                         return;
2365                 if (m == NULL)
2366                         return;
2367         }
2368
2369         if (dst_if == NULL) {
2370                 bridge_broadcast(sc, src_if, m, 1);
2371                 return;
2372         }
2373
2374         /*
2375          * At this point, we're dealing with a unicast frame
2376          * going to a different interface.
2377          */
2378         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2379                 goto drop;
2380
2381         dbif = bridge_lookup_member_if(sc, dst_if);
2382         if (dbif == NULL)
2383                 /* Not a member of the bridge (anymore?) */
2384                 goto drop;
2385
2386         /* Private segments can not talk to each other */
2387         if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2388                 goto drop;
2389
2390         if ((dbif->bif_flags & IFBIF_STP) &&
2391             dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2392                 goto drop;
2393
2394         if (PFIL_HOOKED_OUT(V_inet_pfil_head)
2395 #ifdef INET6
2396             || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2397 #endif
2398             ) {
2399                 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2400                         return;
2401                 if (m == NULL)
2402                         return;
2403         }
2404
2405         bridge_enqueue(sc, dst_if, m);
2406         return;
2407
2408 drop:
2409         m_freem(m);
2410 }
2411
2412 /*
2413  * bridge_input:
2414  *
2415  *      Receive input from a member interface.  Queue the packet for
2416  *      bridging if it is not for us.
2417  */
2418 static struct mbuf *
2419 bridge_input(struct ifnet *ifp, struct mbuf *m)
2420 {
2421         struct bridge_softc *sc = ifp->if_bridge;
2422         struct bridge_iflist *bif, *bif2;
2423         struct ifnet *bifp;
2424         struct ether_header *eh;
2425         struct mbuf *mc, *mc2;
2426         uint16_t vlan;
2427         int error;
2428
2429         NET_EPOCH_ASSERT();
2430
2431         if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2432                 return (m);
2433
2434         bifp = sc->sc_ifp;
2435         vlan = VLANTAGOF(m);
2436
2437         /*
2438          * Implement support for bridge monitoring. If this flag has been
2439          * set on this interface, discard the packet once we push it through
2440          * the bpf(4) machinery, but before we do, increment the byte and
2441          * packet counters associated with this interface.
2442          */
2443         if ((bifp->if_flags & IFF_MONITOR) != 0) {
2444                 m->m_pkthdr.rcvif  = bifp;
2445                 ETHER_BPF_MTAP(bifp, m);
2446                 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1);
2447                 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2448                 m_freem(m);
2449                 return (NULL);
2450         }
2451         bif = bridge_lookup_member_if(sc, ifp);
2452         if (bif == NULL) {
2453                 return (m);
2454         }
2455
2456         eh = mtod(m, struct ether_header *);
2457
2458         bridge_span(sc, m);
2459
2460         if (m->m_flags & (M_BCAST|M_MCAST)) {
2461                 /* Tap off 802.1D packets; they do not get forwarded. */
2462                 if (memcmp(eh->ether_dhost, bstp_etheraddr,
2463                     ETHER_ADDR_LEN) == 0) {
2464                         bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
2465                         return (NULL);
2466                 }
2467
2468                 if ((bif->bif_flags & IFBIF_STP) &&
2469                     bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2470                         return (m);
2471                 }
2472
2473                 /*
2474                  * Make a deep copy of the packet and enqueue the copy
2475                  * for bridge processing; return the original packet for
2476                  * local processing.
2477                  */
2478                 mc = m_dup(m, M_NOWAIT);
2479                 if (mc == NULL) {
2480                         return (m);
2481                 }
2482
2483                 /* Perform the bridge forwarding function with the copy. */
2484                 bridge_forward(sc, bif, mc);
2485
2486                 /*
2487                  * Reinject the mbuf as arriving on the bridge so we have a
2488                  * chance at claiming multicast packets. We can not loop back
2489                  * here from ether_input as a bridge is never a member of a
2490                  * bridge.
2491                  */
2492                 KASSERT(bifp->if_bridge == NULL,
2493                     ("loop created in bridge_input"));
2494                 mc2 = m_dup(m, M_NOWAIT);
2495                 if (mc2 != NULL) {
2496                         /* Keep the layer3 header aligned */
2497                         int i = min(mc2->m_pkthdr.len, max_protohdr);
2498                         mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2499                 }
2500                 if (mc2 != NULL) {
2501                         mc2->m_pkthdr.rcvif = bifp;
2502                         (*bifp->if_input)(bifp, mc2);
2503                 }
2504
2505                 /* Return the original packet for local processing. */
2506                 return (m);
2507         }
2508
2509         if ((bif->bif_flags & IFBIF_STP) &&
2510             bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2511                 return (m);
2512         }
2513
2514 #if (defined(INET) || defined(INET6))
2515 #   define OR_CARP_CHECK_WE_ARE_DST(iface) \
2516         || ((iface)->if_carp \
2517             && (*carp_forus_p)((iface), eh->ether_dhost))
2518 #   define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2519         || ((iface)->if_carp \
2520             && (*carp_forus_p)((iface), eh->ether_shost))
2521 #else
2522 #   define OR_CARP_CHECK_WE_ARE_DST(iface)
2523 #   define OR_CARP_CHECK_WE_ARE_SRC(iface)
2524 #endif
2525
2526 #ifdef INET6
2527 #   define OR_PFIL_HOOKED_INET6 \
2528         || PFIL_HOOKED_IN(V_inet6_pfil_head)
2529 #else
2530 #   define OR_PFIL_HOOKED_INET6
2531 #endif
2532
2533 #define GRAB_OUR_PACKETS(iface) \
2534         if ((iface)->if_type == IFT_GIF) \
2535                 continue; \
2536         /* It is destined for us. */ \
2537         if (memcmp(IF_LLADDR((iface)), eh->ether_dhost,  ETHER_ADDR_LEN) == 0 \
2538             OR_CARP_CHECK_WE_ARE_DST((iface))                           \
2539             ) {                                                         \
2540                 if (bif->bif_flags & IFBIF_LEARNING) {                  \
2541                         error = bridge_rtupdate(sc, eh->ether_shost,    \
2542                             vlan, bif, 0, IFBAF_DYNAMIC);               \
2543                         if (error && bif->bif_addrmax) {                \
2544                                 m_freem(m);                             \
2545                                 return (NULL);                          \
2546                         }                                               \
2547                 }                                                       \
2548                 m->m_pkthdr.rcvif = iface;                              \
2549                 if ((iface) == ifp) {                                   \
2550                         /* Skip bridge processing... src == dest */     \
2551                         return (m);                                     \
2552                 }                                                       \
2553                 /* It's passing over or to the bridge, locally. */      \
2554                 ETHER_BPF_MTAP(bifp, m);                                \
2555                 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1);            \
2556                 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); \
2557                 /* Filter on the physical interface. */                 \
2558                 if (V_pfil_local_phys && (PFIL_HOOKED_IN(V_inet_pfil_head) \
2559                      OR_PFIL_HOOKED_INET6)) {                           \
2560                         if (bridge_pfil(&m, NULL, ifp,                  \
2561                             PFIL_IN) != 0 || m == NULL) {               \
2562                                 return (NULL);                          \
2563                         }                                               \
2564                 }                                                       \
2565                 if ((iface) != bifp)                                    \
2566                         ETHER_BPF_MTAP(iface, m);                       \
2567                 return (m);                                             \
2568         }                                                               \
2569                                                                         \
2570         /* We just received a packet that we sent out. */               \
2571         if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2572             OR_CARP_CHECK_WE_ARE_SRC((iface))                   \
2573             ) {                                                         \
2574                 m_freem(m);                                             \
2575                 return (NULL);                                          \
2576         }
2577
2578         /*
2579          * Unicast.  Make sure it's not for the bridge.
2580          */
2581         do { GRAB_OUR_PACKETS(bifp) } while (0);
2582
2583         /*
2584          * Give a chance for ifp at first priority. This will help when the
2585          * packet comes through the interface like VLAN's with the same MACs
2586          * on several interfaces from the same bridge. This also will save
2587          * some CPU cycles in case the destination interface and the input
2588          * interface (eq ifp) are the same.
2589          */
2590         do { GRAB_OUR_PACKETS(ifp) } while (0);
2591
2592         /* Now check the all bridge members. */
2593         CK_LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2594                 GRAB_OUR_PACKETS(bif2->bif_ifp)
2595         }
2596
2597 #undef OR_CARP_CHECK_WE_ARE_DST
2598 #undef OR_CARP_CHECK_WE_ARE_SRC
2599 #undef OR_PFIL_HOOKED_INET6
2600 #undef GRAB_OUR_PACKETS
2601
2602         /* Perform the bridge forwarding function. */
2603         bridge_forward(sc, bif, m);
2604
2605         return (NULL);
2606 }
2607
2608 /*
2609  * bridge_broadcast:
2610  *
2611  *      Send a frame to all interfaces that are members of
2612  *      the bridge, except for the one on which the packet
2613  *      arrived.
2614  *
2615  *      NOTE: Releases the lock on return.
2616  */
2617 static void
2618 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2619     struct mbuf *m, int runfilt)
2620 {
2621         struct bridge_iflist *dbif, *sbif;
2622         struct mbuf *mc;
2623         struct ifnet *dst_if;
2624         int used = 0, i;
2625
2626         NET_EPOCH_ASSERT();
2627
2628         sbif = bridge_lookup_member_if(sc, src_if);
2629
2630         /* Filter on the bridge interface before broadcasting */
2631         if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head)
2632 #ifdef INET6
2633             || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2634 #endif
2635             )) {
2636                 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2637                         return;
2638                 if (m == NULL)
2639                         return;
2640         }
2641
2642         CK_LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2643                 dst_if = dbif->bif_ifp;
2644                 if (dst_if == src_if)
2645                         continue;
2646
2647                 /* Private segments can not talk to each other */
2648                 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2649                         continue;
2650
2651                 if ((dbif->bif_flags & IFBIF_STP) &&
2652                     dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2653                         continue;
2654
2655                 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2656                     (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2657                         continue;
2658
2659                 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2660                         continue;
2661
2662                 if (CK_LIST_NEXT(dbif, bif_next) == NULL) {
2663                         mc = m;
2664                         used = 1;
2665                 } else {
2666                         mc = m_dup(m, M_NOWAIT);
2667                         if (mc == NULL) {
2668                                 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2669                                 continue;
2670                         }
2671                 }
2672
2673                 /*
2674                  * Filter on the output interface. Pass a NULL bridge interface
2675                  * pointer so we do not redundantly filter on the bridge for
2676                  * each interface we broadcast on.
2677                  */
2678                 if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head)
2679 #ifdef INET6
2680                     || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2681 #endif
2682                     )) {
2683                         if (used == 0) {
2684                                 /* Keep the layer3 header aligned */
2685                                 i = min(mc->m_pkthdr.len, max_protohdr);
2686                                 mc = m_copyup(mc, i, ETHER_ALIGN);
2687                                 if (mc == NULL) {
2688                                         if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2689                                         continue;
2690                                 }
2691                         }
2692                         if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2693                                 continue;
2694                         if (mc == NULL)
2695                                 continue;
2696                 }
2697
2698                 bridge_enqueue(sc, dst_if, mc);
2699         }
2700         if (used == 0)
2701                 m_freem(m);
2702 }
2703
2704 /*
2705  * bridge_span:
2706  *
2707  *      Duplicate a packet out one or more interfaces that are in span mode,
2708  *      the original mbuf is unmodified.
2709  */
2710 static void
2711 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2712 {
2713         struct bridge_iflist *bif;
2714         struct ifnet *dst_if;
2715         struct mbuf *mc;
2716
2717         NET_EPOCH_ASSERT();
2718
2719         if (CK_LIST_EMPTY(&sc->sc_spanlist))
2720                 return;
2721
2722         CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2723                 dst_if = bif->bif_ifp;
2724
2725                 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2726                         continue;
2727
2728                 mc = m_copypacket(m, M_NOWAIT);
2729                 if (mc == NULL) {
2730                         if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2731                         continue;
2732                 }
2733
2734                 bridge_enqueue(sc, dst_if, mc);
2735         }
2736 }
2737
2738 /*
2739  * bridge_rtupdate:
2740  *
2741  *      Add a bridge routing entry.
2742  */
2743 static int
2744 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2745     struct bridge_iflist *bif, int setflags, uint8_t flags)
2746 {
2747         struct bridge_rtnode *brt;
2748         int error;
2749
2750         BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
2751
2752         /* Check the source address is valid and not multicast. */
2753         if (ETHER_IS_MULTICAST(dst) ||
2754             (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2755              dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2756                 return (EINVAL);
2757
2758         /* 802.1p frames map to vlan 1 */
2759         if (vlan == 0)
2760                 vlan = 1;
2761
2762         /*
2763          * A route for this destination might already exist.  If so,
2764          * update it, otherwise create a new one.
2765          */
2766         if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2767                 BRIDGE_RT_LOCK(sc);
2768
2769                 /* Check again, now that we have the lock. There could have
2770                  * been a race and we only want to insert this once. */
2771                 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) != NULL) {
2772                         BRIDGE_RT_UNLOCK(sc);
2773                         return (0);
2774                 }
2775
2776                 if (sc->sc_brtcnt >= sc->sc_brtmax) {
2777                         sc->sc_brtexceeded++;
2778                         BRIDGE_RT_UNLOCK(sc);
2779                         return (ENOSPC);
2780                 }
2781                 /* Check per interface address limits (if enabled) */
2782                 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2783                         bif->bif_addrexceeded++;
2784                         BRIDGE_RT_UNLOCK(sc);
2785                         return (ENOSPC);
2786                 }
2787
2788                 /*
2789                  * Allocate a new bridge forwarding node, and
2790                  * initialize the expiration time and Ethernet
2791                  * address.
2792                  */
2793                 brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2794                 if (brt == NULL) {
2795                         BRIDGE_RT_UNLOCK(sc);
2796                         return (ENOMEM);
2797                 }
2798                 brt->brt_vnet = curvnet;
2799
2800                 if (bif->bif_flags & IFBIF_STICKY)
2801                         brt->brt_flags = IFBAF_STICKY;
2802                 else
2803                         brt->brt_flags = IFBAF_DYNAMIC;
2804
2805                 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2806                 brt->brt_vlan = vlan;
2807
2808                 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2809                         uma_zfree(V_bridge_rtnode_zone, brt);
2810                         BRIDGE_RT_UNLOCK(sc);
2811                         return (error);
2812                 }
2813                 brt->brt_dst = bif;
2814                 bif->bif_addrcnt++;
2815
2816                 BRIDGE_RT_UNLOCK(sc);
2817         }
2818
2819         if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2820             brt->brt_dst != bif) {
2821                 BRIDGE_RT_LOCK(sc);
2822                 brt->brt_dst->bif_addrcnt--;
2823                 brt->brt_dst = bif;
2824                 brt->brt_dst->bif_addrcnt++;
2825                 BRIDGE_RT_UNLOCK(sc);
2826         }
2827
2828         if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2829                 brt->brt_expire = time_uptime + sc->sc_brttimeout;
2830         if (setflags)
2831                 brt->brt_flags = flags;
2832
2833         return (0);
2834 }
2835
2836 /*
2837  * bridge_rtlookup:
2838  *
2839  *      Lookup the destination interface for an address.
2840  */
2841 static struct ifnet *
2842 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2843 {
2844         struct bridge_rtnode *brt;
2845
2846         NET_EPOCH_ASSERT();
2847
2848         if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2849                 return (NULL);
2850
2851         return (brt->brt_ifp);
2852 }
2853
2854 /*
2855  * bridge_rttrim:
2856  *
2857  *      Trim the routine table so that we have a number
2858  *      of routing entries less than or equal to the
2859  *      maximum number.
2860  */
2861 static void
2862 bridge_rttrim(struct bridge_softc *sc)
2863 {
2864         struct bridge_rtnode *brt, *nbrt;
2865
2866         NET_EPOCH_ASSERT();
2867         BRIDGE_RT_LOCK_ASSERT(sc);
2868
2869         /* Make sure we actually need to do this. */
2870         if (sc->sc_brtcnt <= sc->sc_brtmax)
2871                 return;
2872
2873         /* Force an aging cycle; this might trim enough addresses. */
2874         bridge_rtage(sc);
2875         if (sc->sc_brtcnt <= sc->sc_brtmax)
2876                 return;
2877
2878         CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2879                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2880                         bridge_rtnode_destroy(sc, brt);
2881                         if (sc->sc_brtcnt <= sc->sc_brtmax)
2882                                 return;
2883                 }
2884         }
2885 }
2886
2887 /*
2888  * bridge_timer:
2889  *
2890  *      Aging timer for the bridge.
2891  */
2892 static void
2893 bridge_timer(void *arg)
2894 {
2895         struct bridge_softc *sc = arg;
2896
2897         BRIDGE_RT_LOCK_ASSERT(sc);
2898
2899         /* Destruction of rtnodes requires a proper vnet context */
2900         CURVNET_SET(sc->sc_ifp->if_vnet);
2901         bridge_rtage(sc);
2902
2903         if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2904                 callout_reset(&sc->sc_brcallout,
2905                     bridge_rtable_prune_period * hz, bridge_timer, sc);
2906         CURVNET_RESTORE();
2907 }
2908
2909 /*
2910  * bridge_rtage:
2911  *
2912  *      Perform an aging cycle.
2913  */
2914 static void
2915 bridge_rtage(struct bridge_softc *sc)
2916 {
2917         struct bridge_rtnode *brt, *nbrt;
2918
2919         BRIDGE_RT_LOCK_ASSERT(sc);
2920
2921         CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2922                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2923                         if (time_uptime >= brt->brt_expire)
2924                                 bridge_rtnode_destroy(sc, brt);
2925                 }
2926         }
2927 }
2928
2929 /*
2930  * bridge_rtflush:
2931  *
2932  *      Remove all dynamic addresses from the bridge.
2933  */
2934 static void
2935 bridge_rtflush(struct bridge_softc *sc, int full)
2936 {
2937         struct bridge_rtnode *brt, *nbrt;
2938
2939         BRIDGE_RT_LOCK_ASSERT(sc);
2940
2941         CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2942                 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2943                         bridge_rtnode_destroy(sc, brt);
2944         }
2945 }
2946
2947 /*
2948  * bridge_rtdaddr:
2949  *
2950  *      Remove an address from the table.
2951  */
2952 static int
2953 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2954 {
2955         struct bridge_rtnode *brt;
2956         int found = 0;
2957
2958         BRIDGE_RT_LOCK(sc);
2959
2960         /*
2961          * If vlan is zero then we want to delete for all vlans so the lookup
2962          * may return more than one.
2963          */
2964         while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
2965                 bridge_rtnode_destroy(sc, brt);
2966                 found = 1;
2967         }
2968
2969         BRIDGE_RT_UNLOCK(sc);
2970
2971         return (found ? 0 : ENOENT);
2972 }
2973
2974 /*
2975  * bridge_rtdelete:
2976  *
2977  *      Delete routes to a speicifc member interface.
2978  */
2979 static void
2980 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2981 {
2982         struct bridge_rtnode *brt, *nbrt;
2983
2984         BRIDGE_RT_LOCK_ASSERT(sc);
2985
2986         CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2987                 if (brt->brt_ifp == ifp && (full ||
2988                             (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2989                         bridge_rtnode_destroy(sc, brt);
2990         }
2991 }
2992
2993 /*
2994  * bridge_rtable_init:
2995  *
2996  *      Initialize the route table for this bridge.
2997  */
2998 static void
2999 bridge_rtable_init(struct bridge_softc *sc)
3000 {
3001         int i;
3002
3003         sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
3004             M_DEVBUF, M_WAITOK);
3005
3006         for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
3007                 CK_LIST_INIT(&sc->sc_rthash[i]);
3008
3009         sc->sc_rthash_key = arc4random();
3010         CK_LIST_INIT(&sc->sc_rtlist);
3011 }
3012
3013 /*
3014  * bridge_rtable_fini:
3015  *
3016  *      Deconstruct the route table for this bridge.
3017  */
3018 static void
3019 bridge_rtable_fini(struct bridge_softc *sc)
3020 {
3021
3022         KASSERT(sc->sc_brtcnt == 0,
3023             ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
3024         free(sc->sc_rthash, M_DEVBUF);
3025 }
3026
3027 /*
3028  * The following hash function is adapted from "Hash Functions" by Bob Jenkins
3029  * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
3030  */
3031 #define mix(a, b, c)                                                    \
3032 do {                                                                    \
3033         a -= b; a -= c; a ^= (c >> 13);                                 \
3034         b -= c; b -= a; b ^= (a << 8);                                  \
3035         c -= a; c -= b; c ^= (b >> 13);                                 \
3036         a -= b; a -= c; a ^= (c >> 12);                                 \
3037         b -= c; b -= a; b ^= (a << 16);                                 \
3038         c -= a; c -= b; c ^= (b >> 5);                                  \
3039         a -= b; a -= c; a ^= (c >> 3);                                  \
3040         b -= c; b -= a; b ^= (a << 10);                                 \
3041         c -= a; c -= b; c ^= (b >> 15);                                 \
3042 } while (/*CONSTCOND*/0)
3043
3044 static __inline uint32_t
3045 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
3046 {
3047         uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
3048
3049         b += addr[5] << 8;
3050         b += addr[4];
3051         a += addr[3] << 24;
3052         a += addr[2] << 16;
3053         a += addr[1] << 8;
3054         a += addr[0];
3055
3056         mix(a, b, c);
3057
3058         return (c & BRIDGE_RTHASH_MASK);
3059 }
3060
3061 #undef mix
3062
3063 static int
3064 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
3065 {
3066         int i, d;
3067
3068         for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
3069                 d = ((int)a[i]) - ((int)b[i]);
3070         }
3071
3072         return (d);
3073 }
3074
3075 /*
3076  * bridge_rtnode_lookup:
3077  *
3078  *      Look up a bridge route node for the specified destination. Compare the
3079  *      vlan id or if zero then just return the first match.
3080  */
3081 static struct bridge_rtnode *
3082 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
3083 {
3084         struct bridge_rtnode *brt;
3085         uint32_t hash;
3086         int dir;
3087
3088         BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(sc);
3089
3090         hash = bridge_rthash(sc, addr);
3091         CK_LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
3092                 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
3093                 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
3094                         return (brt);
3095                 if (dir > 0)
3096                         return (NULL);
3097         }
3098
3099         return (NULL);
3100 }
3101
3102 /*
3103  * bridge_rtnode_insert:
3104  *
3105  *      Insert the specified bridge node into the route table.  We
3106  *      assume the entry is not already in the table.
3107  */
3108 static int
3109 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
3110 {
3111         struct bridge_rtnode *lbrt;
3112         uint32_t hash;
3113         int dir;
3114
3115         BRIDGE_RT_LOCK_ASSERT(sc);
3116
3117         hash = bridge_rthash(sc, brt->brt_addr);
3118
3119         lbrt = CK_LIST_FIRST(&sc->sc_rthash[hash]);
3120         if (lbrt == NULL) {
3121                 CK_LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
3122                 goto out;
3123         }
3124
3125         do {
3126                 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
3127                 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
3128                         return (EEXIST);
3129                 if (dir > 0) {
3130                         CK_LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
3131                         goto out;
3132                 }
3133                 if (CK_LIST_NEXT(lbrt, brt_hash) == NULL) {
3134                         CK_LIST_INSERT_AFTER(lbrt, brt, brt_hash);
3135                         goto out;
3136                 }
3137                 lbrt = CK_LIST_NEXT(lbrt, brt_hash);
3138         } while (lbrt != NULL);
3139
3140 #ifdef DIAGNOSTIC
3141         panic("bridge_rtnode_insert: impossible");
3142 #endif
3143
3144 out:
3145         CK_LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
3146         sc->sc_brtcnt++;
3147
3148         return (0);
3149 }
3150
3151 static void
3152 bridge_rtnode_destroy_cb(struct epoch_context *ctx)
3153 {
3154         struct bridge_rtnode *brt;
3155
3156         brt = __containerof(ctx, struct bridge_rtnode, brt_epoch_ctx);
3157
3158         CURVNET_SET(brt->brt_vnet);
3159         uma_zfree(V_bridge_rtnode_zone, brt);
3160         CURVNET_RESTORE();
3161 }
3162
3163 /*
3164  * bridge_rtnode_destroy:
3165  *
3166  *      Destroy a bridge rtnode.
3167  */
3168 static void
3169 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
3170 {
3171         BRIDGE_RT_LOCK_ASSERT(sc);
3172
3173         CK_LIST_REMOVE(brt, brt_hash);
3174
3175         CK_LIST_REMOVE(brt, brt_list);
3176         sc->sc_brtcnt--;
3177         brt->brt_dst->bif_addrcnt--;
3178
3179         NET_EPOCH_CALL(bridge_rtnode_destroy_cb, &brt->brt_epoch_ctx);
3180 }
3181
3182 /*
3183  * bridge_rtable_expire:
3184  *
3185  *      Set the expiry time for all routes on an interface.
3186  */
3187 static void
3188 bridge_rtable_expire(struct ifnet *ifp, int age)
3189 {
3190         struct bridge_softc *sc = ifp->if_bridge;
3191         struct bridge_rtnode *brt;
3192
3193         CURVNET_SET(ifp->if_vnet);
3194         BRIDGE_RT_LOCK(sc);
3195
3196         /*
3197          * If the age is zero then flush, otherwise set all the expiry times to
3198          * age for the interface
3199          */
3200         if (age == 0)
3201                 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
3202         else {
3203                 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
3204                         /* Cap the expiry time to 'age' */
3205                         if (brt->brt_ifp == ifp &&
3206                             brt->brt_expire > time_uptime + age &&
3207                             (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
3208                                 brt->brt_expire = time_uptime + age;
3209                 }
3210         }
3211         BRIDGE_RT_UNLOCK(sc);
3212         CURVNET_RESTORE();
3213 }
3214
3215 /*
3216  * bridge_state_change:
3217  *
3218  *      Callback from the bridgestp code when a port changes states.
3219  */
3220 static void
3221 bridge_state_change(struct ifnet *ifp, int state)
3222 {
3223         struct bridge_softc *sc = ifp->if_bridge;
3224         static const char *stpstates[] = {
3225                 "disabled",
3226                 "listening",
3227                 "learning",
3228                 "forwarding",
3229                 "blocking",
3230                 "discarding"
3231         };
3232
3233         CURVNET_SET(ifp->if_vnet);
3234         if (V_log_stp)
3235                 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
3236                     sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
3237         CURVNET_RESTORE();
3238 }
3239
3240 /*
3241  * Send bridge packets through pfil if they are one of the types pfil can deal
3242  * with, or if they are ARP or REVARP.  (pfil will pass ARP and REVARP without
3243  * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
3244  * that interface.
3245  */
3246 static int
3247 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
3248 {
3249         int snap, error, i, hlen;
3250         struct ether_header *eh1, eh2;
3251         struct ip *ip;
3252         struct llc llc1;
3253         u_int16_t ether_type;
3254         pfil_return_t rv;
3255
3256         snap = 0;
3257         error = -1;     /* Default error if not error == 0 */
3258
3259 #if 0
3260         /* we may return with the IP fields swapped, ensure its not shared */
3261         KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
3262 #endif
3263
3264         if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0)
3265                 return (0); /* filtering is disabled */
3266
3267         i = min((*mp)->m_pkthdr.len, max_protohdr);
3268         if ((*mp)->m_len < i) {
3269             *mp = m_pullup(*mp, i);
3270             if (*mp == NULL) {
3271                 printf("%s: m_pullup failed\n", __func__);
3272                 return (-1);
3273             }
3274         }
3275
3276         eh1 = mtod(*mp, struct ether_header *);
3277         ether_type = ntohs(eh1->ether_type);
3278
3279         /*
3280          * Check for SNAP/LLC.
3281          */
3282         if (ether_type < ETHERMTU) {
3283                 struct llc *llc2 = (struct llc *)(eh1 + 1);
3284
3285                 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3286                     llc2->llc_dsap == LLC_SNAP_LSAP &&
3287                     llc2->llc_ssap == LLC_SNAP_LSAP &&
3288                     llc2->llc_control == LLC_UI) {
3289                         ether_type = htons(llc2->llc_un.type_snap.ether_type);
3290                         snap = 1;
3291                 }
3292         }
3293
3294         /*
3295          * If we're trying to filter bridge traffic, don't look at anything
3296          * other than IP and ARP traffic.  If the filter doesn't understand
3297          * IPv6, don't allow IPv6 through the bridge either.  This is lame
3298          * since if we really wanted, say, an AppleTalk filter, we are hosed,
3299          * but of course we don't have an AppleTalk filter to begin with.
3300          * (Note that since pfil doesn't understand ARP it will pass *ALL*
3301          * ARP traffic.)
3302          */
3303         switch (ether_type) {
3304                 case ETHERTYPE_ARP:
3305                 case ETHERTYPE_REVARP:
3306                         if (V_pfil_ipfw_arp == 0)
3307                                 return (0); /* Automatically pass */
3308                         break;
3309
3310                 case ETHERTYPE_IP:
3311 #ifdef INET6
3312                 case ETHERTYPE_IPV6:
3313 #endif /* INET6 */
3314                         break;
3315                 default:
3316                         /*
3317                          * Check to see if the user wants to pass non-ip
3318                          * packets, these will not be checked by pfil(9) and
3319                          * passed unconditionally so the default is to drop.
3320                          */
3321                         if (V_pfil_onlyip)
3322                                 goto bad;
3323         }
3324
3325         /* Run the packet through pfil before stripping link headers */
3326         if (PFIL_HOOKED_OUT(V_link_pfil_head) && V_pfil_ipfw != 0 &&
3327             dir == PFIL_OUT && ifp != NULL) {
3328                 switch (pfil_run_hooks(V_link_pfil_head, mp, ifp, dir, NULL)) {
3329                 case PFIL_DROPPED:
3330                         return (EACCES);
3331                 case PFIL_CONSUMED:
3332                         return (0);
3333                 }
3334         }
3335
3336         /* Strip off the Ethernet header and keep a copy. */
3337         m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3338         m_adj(*mp, ETHER_HDR_LEN);
3339
3340         /* Strip off snap header, if present */
3341         if (snap) {
3342                 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3343                 m_adj(*mp, sizeof(struct llc));
3344         }
3345
3346         /*
3347          * Check the IP header for alignment and errors
3348          */
3349         if (dir == PFIL_IN) {
3350                 switch (ether_type) {
3351                         case ETHERTYPE_IP:
3352                                 error = bridge_ip_checkbasic(mp);
3353                                 break;
3354 #ifdef INET6
3355                         case ETHERTYPE_IPV6:
3356                                 error = bridge_ip6_checkbasic(mp);
3357                                 break;
3358 #endif /* INET6 */
3359                         default:
3360                                 error = 0;
3361                 }
3362                 if (error)
3363                         goto bad;
3364         }
3365
3366         error = 0;
3367
3368         /*
3369          * Run the packet through pfil
3370          */
3371         rv = PFIL_PASS;
3372         switch (ether_type) {
3373         case ETHERTYPE_IP:
3374                 /*
3375                  * Run pfil on the member interface and the bridge, both can
3376                  * be skipped by clearing pfil_member or pfil_bridge.
3377                  *
3378                  * Keep the order:
3379                  *   in_if -> bridge_if -> out_if
3380                  */
3381                 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv =
3382                     pfil_run_hooks(V_inet_pfil_head, mp, bifp, dir, NULL)) !=
3383                     PFIL_PASS)
3384                         break;
3385
3386                 if (V_pfil_member && ifp != NULL && (rv =
3387                     pfil_run_hooks(V_inet_pfil_head, mp, ifp, dir, NULL)) !=
3388                     PFIL_PASS)
3389                         break;
3390
3391                 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv =
3392                     pfil_run_hooks(V_inet_pfil_head, mp, bifp, dir, NULL)) !=
3393                     PFIL_PASS)
3394                         break;
3395
3396                 /* check if we need to fragment the packet */
3397                 /* bridge_fragment generates a mbuf chain of packets */
3398                 /* that already include eth headers */
3399                 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) {
3400                         i = (*mp)->m_pkthdr.len;
3401                         if (i > ifp->if_mtu) {
3402                                 error = bridge_fragment(ifp, mp, &eh2, snap,
3403                                             &llc1);
3404                                 return (error);
3405                         }
3406                 }
3407
3408                 /* Recalculate the ip checksum. */
3409                 ip = mtod(*mp, struct ip *);
3410                 hlen = ip->ip_hl << 2;
3411                 if (hlen < sizeof(struct ip))
3412                         goto bad;
3413                 if (hlen > (*mp)->m_len) {
3414                         if ((*mp = m_pullup(*mp, hlen)) == NULL)
3415                                 goto bad;
3416                         ip = mtod(*mp, struct ip *);
3417                         if (ip == NULL)
3418                                 goto bad;
3419                 }
3420                 ip->ip_sum = 0;
3421                 if (hlen == sizeof(struct ip))
3422                         ip->ip_sum = in_cksum_hdr(ip);
3423                 else
3424                         ip->ip_sum = in_cksum(*mp, hlen);
3425
3426                 break;
3427 #ifdef INET6
3428         case ETHERTYPE_IPV6:
3429                 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv =
3430                     pfil_run_hooks(V_inet6_pfil_head, mp, bifp, dir, NULL)) !=
3431                     PFIL_PASS)
3432                         break;
3433
3434                 if (V_pfil_member && ifp != NULL && (rv =
3435                     pfil_run_hooks(V_inet6_pfil_head, mp, ifp, dir, NULL)) !=
3436                     PFIL_PASS)
3437                         break;
3438
3439                 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv =
3440                     pfil_run_hooks(V_inet6_pfil_head, mp, bifp, dir, NULL)) !=
3441                     PFIL_PASS)
3442                         break;
3443                 break;
3444 #endif
3445         }
3446
3447         switch (rv) {
3448         case PFIL_CONSUMED:
3449                 return (0);
3450         case PFIL_DROPPED:
3451                 return (EACCES);
3452         default:
3453                 break;
3454         }
3455
3456         error = -1;
3457
3458         /*
3459          * Finally, put everything back the way it was and return
3460          */
3461         if (snap) {
3462                 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT);
3463                 if (*mp == NULL)
3464                         return (error);
3465                 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3466         }
3467
3468         M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT);
3469         if (*mp == NULL)
3470                 return (error);
3471         bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3472
3473         return (0);
3474
3475 bad:
3476         m_freem(*mp);
3477         *mp = NULL;
3478         return (error);
3479 }
3480
3481 /*
3482  * Perform basic checks on header size since
3483  * pfil assumes ip_input has already processed
3484  * it for it.  Cut-and-pasted from ip_input.c.
3485  * Given how simple the IPv6 version is,
3486  * does the IPv4 version really need to be
3487  * this complicated?
3488  *
3489  * XXX Should we update ipstat here, or not?
3490  * XXX Right now we update ipstat but not
3491  * XXX csum_counter.
3492  */
3493 static int
3494 bridge_ip_checkbasic(struct mbuf **mp)
3495 {
3496         struct mbuf *m = *mp;
3497         struct ip *ip;
3498         int len, hlen;
3499         u_short sum;
3500
3501         if (*mp == NULL)
3502                 return (-1);
3503
3504         if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3505                 if ((m = m_copyup(m, sizeof(struct ip),
3506                         (max_linkhdr + 3) & ~3)) == NULL) {
3507                         /* XXXJRT new stat, please */
3508                         KMOD_IPSTAT_INC(ips_toosmall);
3509                         goto bad;
3510                 }
3511         } else if (__predict_false(m->m_len < sizeof (struct ip))) {
3512                 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3513                         KMOD_IPSTAT_INC(ips_toosmall);
3514                         goto bad;
3515                 }
3516         }
3517         ip = mtod(m, struct ip *);
3518         if (ip == NULL) goto bad;
3519
3520         if (ip->ip_v != IPVERSION) {
3521                 KMOD_IPSTAT_INC(ips_badvers);
3522                 goto bad;
3523         }
3524         hlen = ip->ip_hl << 2;
3525         if (hlen < sizeof(struct ip)) { /* minimum header length */
3526                 KMOD_IPSTAT_INC(ips_badhlen);
3527                 goto bad;
3528         }
3529         if (hlen > m->m_len) {
3530                 if ((m = m_pullup(m, hlen)) == NULL) {
3531                         KMOD_IPSTAT_INC(ips_badhlen);
3532                         goto bad;
3533                 }
3534                 ip = mtod(m, struct ip *);
3535                 if (ip == NULL) goto bad;
3536         }
3537
3538         if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3539                 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3540         } else {
3541                 if (hlen == sizeof(struct ip)) {
3542                         sum = in_cksum_hdr(ip);
3543                 } else {
3544                         sum = in_cksum(m, hlen);
3545                 }
3546         }
3547         if (sum) {
3548                 KMOD_IPSTAT_INC(ips_badsum);
3549                 goto bad;
3550         }
3551
3552         /* Retrieve the packet length. */
3553         len = ntohs(ip->ip_len);
3554
3555         /*
3556          * Check for additional length bogosity
3557          */
3558         if (len < hlen) {
3559                 KMOD_IPSTAT_INC(ips_badlen);
3560                 goto bad;
3561         }
3562
3563         /*
3564          * Check that the amount of data in the buffers
3565          * is as at least much as the IP header would have us expect.
3566          * Drop packet if shorter than we expect.
3567          */
3568         if (m->m_pkthdr.len < len) {
3569                 KMOD_IPSTAT_INC(ips_tooshort);
3570                 goto bad;
3571         }
3572
3573         /* Checks out, proceed */
3574         *mp = m;
3575         return (0);
3576
3577 bad:
3578         *mp = m;
3579         return (-1);
3580 }
3581
3582 #ifdef INET6
3583 /*
3584  * Same as above, but for IPv6.
3585  * Cut-and-pasted from ip6_input.c.
3586  * XXX Should we update ip6stat, or not?
3587  */
3588 static int
3589 bridge_ip6_checkbasic(struct mbuf **mp)
3590 {
3591         struct mbuf *m = *mp;
3592         struct ip6_hdr *ip6;
3593
3594         /*
3595          * If the IPv6 header is not aligned, slurp it up into a new
3596          * mbuf with space for link headers, in the event we forward
3597          * it.  Otherwise, if it is aligned, make sure the entire base
3598          * IPv6 header is in the first mbuf of the chain.
3599          */
3600         if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3601                 struct ifnet *inifp = m->m_pkthdr.rcvif;
3602                 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3603                             (max_linkhdr + 3) & ~3)) == NULL) {
3604                         /* XXXJRT new stat, please */
3605                         IP6STAT_INC(ip6s_toosmall);
3606                         in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3607                         goto bad;
3608                 }
3609         } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3610                 struct ifnet *inifp = m->m_pkthdr.rcvif;
3611                 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3612                         IP6STAT_INC(ip6s_toosmall);
3613                         in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3614                         goto bad;
3615                 }
3616         }
3617
3618         ip6 = mtod(m, struct ip6_hdr *);
3619
3620         if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3621                 IP6STAT_INC(ip6s_badvers);
3622                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3623                 goto bad;
3624         }
3625
3626         /* Checks out, proceed */
3627         *mp = m;
3628         return (0);
3629
3630 bad:
3631         *mp = m;
3632         return (-1);
3633 }
3634 #endif /* INET6 */
3635
3636 /*
3637  * bridge_fragment:
3638  *
3639  *      Fragment mbuf chain in multiple packets and prepend ethernet header.
3640  */
3641 static int
3642 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh,
3643     int snap, struct llc *llc)
3644 {
3645         struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL;
3646         struct ip *ip;
3647         int error = -1;
3648
3649         if (m->m_len < sizeof(struct ip) &&
3650             (m = m_pullup(m, sizeof(struct ip))) == NULL)
3651                 goto dropit;
3652         ip = mtod(m, struct ip *);
3653
3654         m->m_pkthdr.csum_flags |= CSUM_IP;
3655         error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist);
3656         if (error)
3657                 goto dropit;
3658
3659         /*
3660          * Walk the chain and re-add the Ethernet header for
3661          * each mbuf packet.
3662          */
3663         for (mcur = m; mcur; mcur = mcur->m_nextpkt) {
3664                 nextpkt = mcur->m_nextpkt;
3665                 mcur->m_nextpkt = NULL;
3666                 if (snap) {
3667                         M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT);
3668                         if (mcur == NULL) {
3669                                 error = ENOBUFS;
3670                                 if (mprev != NULL)
3671                                         mprev->m_nextpkt = nextpkt;
3672                                 goto dropit;
3673                         }
3674                         bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc));
3675                 }
3676
3677                 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT);
3678                 if (mcur == NULL) {
3679                         error = ENOBUFS;
3680                         if (mprev != NULL)
3681                                 mprev->m_nextpkt = nextpkt;
3682                         goto dropit;
3683                 }
3684                 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN);
3685
3686                 /*
3687                  * The previous two M_PREPEND could have inserted one or two
3688                  * mbufs in front so we have to update the previous packet's
3689                  * m_nextpkt.
3690                  */
3691                 mcur->m_nextpkt = nextpkt;
3692                 if (mprev != NULL)
3693                         mprev->m_nextpkt = mcur;
3694                 else {
3695                         /* The first mbuf in the original chain needs to be
3696                          * updated. */
3697                         *mp = mcur;
3698                 }
3699                 mprev = mcur;
3700         }
3701
3702         KMOD_IPSTAT_INC(ips_fragmented);
3703         return (error);
3704
3705 dropit:
3706         for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */
3707                 m = mcur->m_nextpkt;
3708                 m_freem(mcur);
3709         }
3710         return (error);
3711 }
3712
3713 static void
3714 bridge_linkstate(struct ifnet *ifp)
3715 {
3716         struct bridge_softc *sc = ifp->if_bridge;
3717         struct bridge_iflist *bif;
3718         struct epoch_tracker et;
3719
3720         NET_EPOCH_ENTER(et);
3721
3722         bif = bridge_lookup_member_if(sc, ifp);
3723         if (bif == NULL) {
3724                 NET_EPOCH_EXIT(et);
3725                 return;
3726         }
3727         bridge_linkcheck(sc);
3728
3729         bstp_linkstate(&bif->bif_stp);
3730
3731         NET_EPOCH_EXIT(et);
3732 }
3733
3734 static void
3735 bridge_linkcheck(struct bridge_softc *sc)
3736 {
3737         struct bridge_iflist *bif;
3738         int new_link, hasls;
3739
3740         BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc);
3741
3742         new_link = LINK_STATE_DOWN;
3743         hasls = 0;
3744         /* Our link is considered up if at least one of our ports is active */
3745         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
3746                 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
3747                         hasls++;
3748                 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
3749                         new_link = LINK_STATE_UP;
3750                         break;
3751                 }
3752         }
3753         if (!CK_LIST_EMPTY(&sc->sc_iflist) && !hasls) {
3754                 /* If no interfaces support link-state then we default to up */
3755                 new_link = LINK_STATE_UP;
3756         }
3757         if_link_state_change(sc->sc_ifp, new_link);
3758 }