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