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