sys/net/if_bridge.c

   1 /*      $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $       */
   2
   3 /*
   4  * Copyright 2001 Wasabi Systems, Inc.
   5  * All rights reserved.
   6  *
   7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed for the NetBSD Project by
  20  *      Wasabi Systems, Inc.
  21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
  22  *    or promote products derived from this software without specific prior
  23  *    written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
  29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  35  * POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 /*
  39  * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net)
  40  * All rights reserved.
  41  *
  42  * Redistribution and use in source and binary forms, with or without
  43  * modification, are permitted provided that the following conditions
  44  * are met:
  45  * 1. Redistributions of source code must retain the above copyright
  46  *    notice, this list of conditions and the following disclaimer.
  47  * 2. Redistributions in binary form must reproduce the above copyright
  48  *    notice, this list of conditions and the following disclaimer in the
  49  *    documentation and/or other materials provided with the distribution.
  50  *
  51  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  52  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  53  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  54  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  55  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  56  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  57  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  58  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  59  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  60  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  61  * POSSIBILITY OF SUCH DAMAGE.
  62  *
  63  * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp
  64  */
  65
  66 /*
  67  * Network interface bridge support.
  68  *
  69  * TODO:
  70  *
  71  *      - Currently only supports Ethernet-like interfaces (Ethernet,
  72  *        802.11, VLANs on Ethernet, etc.)  Figure out a nice way
  73  *        to bridge other types of interfaces (FDDI-FDDI, and maybe
  74  *        consider heterogenous bridges).
  75  */
  76
  77 #include <sys/cdefs.h>
  78 __FBSDID("$FreeBSD$");
  79
  80 #include "opt_inet.h"
  81 #include "opt_inet6.h"
  82
  83 #include <sys/param.h>
  84 #include <sys/mbuf.h>
  85 #include <sys/malloc.h>
  86 #include <sys/protosw.h>
  87 #include <sys/systm.h>
  88 #include <sys/jail.h>
  89 #include <sys/time.h>
  90 #include <sys/socket.h> /* for net/if.h */
  91 #include <sys/sockio.h>
  92 #include <sys/ctype.h>  /* string functions */
  93 #include <sys/kernel.h>
  94 #include <sys/random.h>
  95 #include <sys/syslog.h>
  96 #include <sys/sysctl.h>
  97 #include <vm/uma.h>
  98 #include <sys/module.h>
  99 #include <sys/priv.h>
 100 #include <sys/proc.h>
 101 #include <sys/lock.h>
 102 #include <sys/mutex.h>
 103 #include <sys/rwlock.h>
 104
 105 #include <net/bpf.h>
 106 #include <net/if.h>
 107 #include <net/if_clone.h>
 108 #include <net/if_dl.h>
 109 #include <net/if_types.h>
 110 #include <net/if_var.h>
 111 #include <net/pfil.h>
 112 #include <net/vnet.h>
 113
 114 #include <netinet/in.h> /* for struct arpcom */
 115 #include <netinet/in_systm.h>
 116 #include <netinet/in_var.h>
 117 #include <netinet/ip.h>
 118 #include <netinet/ip_var.h>
 119 #ifdef INET6
 120 #include <netinet/ip6.h>
 121 #include <netinet6/ip6_var.h>
 122 #endif
 123 #if defined(INET) || defined(INET6)
 124 #include <netinet/ip_carp.h>
 125 #endif
 126 #include <machine/in_cksum.h>
 127 #include <netinet/if_ether.h> /* for struct arpcom */
 128 #include <net/bridgestp.h>
 129 #include <net/if_bridgevar.h>
 130 #include <net/if_llc.h>
 131 #include <net/if_vlan_var.h>
 132
 133 #include <net/route.h>
 134 #include <netinet/ip_fw.h>
 135 #include <netinet/ipfw/ip_fw_private.h>
 136
 137 /*
 138  * Size of the route hash table.  Must be a power of two.
 139  */
 140 #ifndef BRIDGE_RTHASH_SIZE
 141 #define BRIDGE_RTHASH_SIZE              1024
 142 #endif
 143
 144 #define BRIDGE_RTHASH_MASK              (BRIDGE_RTHASH_SIZE - 1)
 145
 146 /*
 147  * Default maximum number of addresses to cache.
 148  */
 149 #ifndef BRIDGE_RTABLE_MAX
 150 #define BRIDGE_RTABLE_MAX               2000
 151 #endif
 152
 153 /*
 154  * Timeout (in seconds) for entries learned dynamically.
 155  */
 156 #ifndef BRIDGE_RTABLE_TIMEOUT
 157 #define BRIDGE_RTABLE_TIMEOUT           (20 * 60)       /* same as ARP */
 158 #endif
 159
 160 /*
 161  * Number of seconds between walks of the route list.
 162  */
 163 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
 164 #define BRIDGE_RTABLE_PRUNE_PERIOD      (5 * 60)
 165 #endif
 166
 167 /*
 168  * List of capabilities to possibly mask on the member interface.
 169  */
 170 #define BRIDGE_IFCAPS_MASK              (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM)
 171
 172 /*
 173  * List of capabilities to strip
 174  */
 175 #define BRIDGE_IFCAPS_STRIP             IFCAP_LRO
 176
 177 /*
 178  * Bridge interface list entry.
 179  */
 180 struct bridge_iflist {
 181         LIST_ENTRY(bridge_iflist) bif_next;
 182         struct ifnet            *bif_ifp;       /* member if */
 183         struct bstp_port        bif_stp;        /* STP state */
 184         uint32_t                bif_flags;      /* member if flags */
 185         int                     bif_savedcaps;  /* saved capabilities */
 186         uint32_t                bif_addrmax;    /* max # of addresses */
 187         uint32_t                bif_addrcnt;    /* cur. # of addresses */
 188         uint32_t                bif_addrexceeded;/* # of address violations */
 189 };
 190
 191 /*
 192  * Bridge route node.
 193  */
 194 struct bridge_rtnode {
 195         LIST_ENTRY(bridge_rtnode) brt_hash;     /* hash table linkage */
 196         LIST_ENTRY(bridge_rtnode) brt_list;     /* list linkage */
 197         struct bridge_iflist    *brt_dst;       /* destination if */
 198         unsigned long           brt_expire;     /* expiration time */
 199         uint8_t                 brt_flags;      /* address flags */
 200         uint8_t                 brt_addr[ETHER_ADDR_LEN];
 201         uint16_t                brt_vlan;       /* vlan id */
 202 };
 203 #define brt_ifp                 brt_dst->bif_ifp
 204
 205 /*
 206  * Software state for each bridge.
 207  */
 208 struct bridge_softc {
 209         struct ifnet            *sc_ifp;        /* make this an interface */
 210         LIST_ENTRY(bridge_softc) sc_list;
 211         struct mtx              sc_mtx;
 212         struct cv               sc_cv;
 213         uint32_t                sc_brtmax;      /* max # of addresses */
 214         uint32_t                sc_brtcnt;      /* cur. # of addresses */
 215         uint32_t                sc_brttimeout;  /* rt timeout in seconds */
 216         struct callout          sc_brcallout;   /* bridge callout */
 217         uint32_t                sc_iflist_ref;  /* refcount for sc_iflist */
 218         uint32_t                sc_iflist_xcnt; /* refcount for sc_iflist */
 219         LIST_HEAD(, bridge_iflist) sc_iflist;   /* member interface list */
 220         LIST_HEAD(, bridge_rtnode) *sc_rthash;  /* our forwarding table */
 221         LIST_HEAD(, bridge_rtnode) sc_rtlist;   /* list version of above */
 222         uint32_t                sc_rthash_key;  /* key for hash */
 223         LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */
 224         struct bstp_state       sc_stp;         /* STP state */
 225         uint32_t                sc_brtexceeded; /* # of cache drops */
 226         struct ifnet            *sc_ifaddr;     /* member mac copied from */
 227         u_char                  sc_defaddr[6];  /* Default MAC address */
 228 };
 229
 230 static struct mtx       bridge_list_mtx;
 231 eventhandler_tag        bridge_detach_cookie = NULL;
 232
 233 int     bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
 234
 235 uma_zone_t bridge_rtnode_zone;
 236
 237 static int      bridge_clone_create(struct if_clone *, int, caddr_t);
 238 static void     bridge_clone_destroy(struct ifnet *);
 239
 240 static int      bridge_ioctl(struct ifnet *, u_long, caddr_t);
 241 static void     bridge_mutecaps(struct bridge_softc *);
 242 static void     bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
 243                     int);
 244 static void     bridge_ifdetach(void *arg __unused, struct ifnet *);
 245 static void     bridge_init(void *);
 246 static void     bridge_dummynet(struct mbuf *, struct ifnet *);
 247 static void     bridge_stop(struct ifnet *, int);
 248 static void     bridge_start(struct ifnet *);
 249 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
 250 static int      bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
 251                     struct rtentry *);
 252 static void     bridge_enqueue(struct bridge_softc *, struct ifnet *,
 253                     struct mbuf *);
 254 static void     bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
 255
 256 static void     bridge_forward(struct bridge_softc *, struct bridge_iflist *,
 257                     struct mbuf *m);
 258
 259 static void     bridge_timer(void *);
 260
 261 static void     bridge_broadcast(struct bridge_softc *, struct ifnet *,
 262                     struct mbuf *, int);
 263 static void     bridge_span(struct bridge_softc *, struct mbuf *);
 264
 265 static int      bridge_rtupdate(struct bridge_softc *, const uint8_t *,
 266                     uint16_t, struct bridge_iflist *, int, uint8_t);
 267 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
 268                     uint16_t);
 269 static void     bridge_rttrim(struct bridge_softc *);
 270 static void     bridge_rtage(struct bridge_softc *);
 271 static void     bridge_rtflush(struct bridge_softc *, int);
 272 static int      bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
 273                     uint16_t);
 274
 275 static int      bridge_rtable_init(struct bridge_softc *);
 276 static void     bridge_rtable_fini(struct bridge_softc *);
 277
 278 static int      bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
 279 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
 280                     const uint8_t *, uint16_t);
 281 static int      bridge_rtnode_insert(struct bridge_softc *,
 282                     struct bridge_rtnode *);
 283 static void     bridge_rtnode_destroy(struct bridge_softc *,
 284                     struct bridge_rtnode *);
 285 static void     bridge_rtable_expire(struct ifnet *, int);
 286 static void     bridge_state_change(struct ifnet *, int);
 287
 288 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
 289                     const char *name);
 290 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
 291                     struct ifnet *ifp);
 292 static void     bridge_delete_member(struct bridge_softc *,
 293                     struct bridge_iflist *, int);
 294 static void     bridge_delete_span(struct bridge_softc *,
 295                     struct bridge_iflist *);
 296
 297 static int      bridge_ioctl_add(struct bridge_softc *, void *);
 298 static int      bridge_ioctl_del(struct bridge_softc *, void *);
 299 static int      bridge_ioctl_gifflags(struct bridge_softc *, void *);
 300 static int      bridge_ioctl_sifflags(struct bridge_softc *, void *);
 301 static int      bridge_ioctl_scache(struct bridge_softc *, void *);
 302 static int      bridge_ioctl_gcache(struct bridge_softc *, void *);
 303 static int      bridge_ioctl_gifs(struct bridge_softc *, void *);
 304 static int      bridge_ioctl_rts(struct bridge_softc *, void *);
 305 static int      bridge_ioctl_saddr(struct bridge_softc *, void *);
 306 static int      bridge_ioctl_sto(struct bridge_softc *, void *);
 307 static int      bridge_ioctl_gto(struct bridge_softc *, void *);
 308 static int      bridge_ioctl_daddr(struct bridge_softc *, void *);
 309 static int      bridge_ioctl_flush(struct bridge_softc *, void *);
 310 static int      bridge_ioctl_gpri(struct bridge_softc *, void *);
 311 static int      bridge_ioctl_spri(struct bridge_softc *, void *);
 312 static int      bridge_ioctl_ght(struct bridge_softc *, void *);
 313 static int      bridge_ioctl_sht(struct bridge_softc *, void *);
 314 static int      bridge_ioctl_gfd(struct bridge_softc *, void *);
 315 static int      bridge_ioctl_sfd(struct bridge_softc *, void *);
 316 static int      bridge_ioctl_gma(struct bridge_softc *, void *);
 317 static int      bridge_ioctl_sma(struct bridge_softc *, void *);
 318 static int      bridge_ioctl_sifprio(struct bridge_softc *, void *);
 319 static int      bridge_ioctl_sifcost(struct bridge_softc *, void *);
 320 static int      bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
 321 static int      bridge_ioctl_addspan(struct bridge_softc *, void *);
 322 static int      bridge_ioctl_delspan(struct bridge_softc *, void *);
 323 static int      bridge_ioctl_gbparam(struct bridge_softc *, void *);
 324 static int      bridge_ioctl_grte(struct bridge_softc *, void *);
 325 static int      bridge_ioctl_gifsstp(struct bridge_softc *, void *);
 326 static int      bridge_ioctl_sproto(struct bridge_softc *, void *);
 327 static int      bridge_ioctl_stxhc(struct bridge_softc *, void *);
 328 static int      bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
 329                     int);
 330 static int      bridge_ip_checkbasic(struct mbuf **mp);
 331 #ifdef INET6
 332 static int      bridge_ip6_checkbasic(struct mbuf **mp);
 333 #endif /* INET6 */
 334 static int      bridge_fragment(struct ifnet *, struct mbuf *,
 335                     struct ether_header *, int, struct llc *);
 336 static void     bridge_linkstate(struct ifnet *ifp);
 337 static void     bridge_linkcheck(struct bridge_softc *sc);
 338
 339 extern void (*bridge_linkstate_p)(struct ifnet *ifp);
 340
 341 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
 342 #define VLANTAGOF(_m)   \
 343     (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
 344
 345 static struct bstp_cb_ops bridge_ops = {
 346         .bcb_state = bridge_state_change,
 347         .bcb_rtage = bridge_rtable_expire
 348 };
 349
 350 SYSCTL_DECL(_net_link);
 351 SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
 352
 353 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */
 354 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */
 355 static int pfil_member = 1; /* run pfil hooks on the member interface */
 356 static int pfil_ipfw = 0;   /* layer2 filter with ipfw */
 357 static int pfil_ipfw_arp = 0;   /* layer2 filter with ipfw */
 358 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for
 359                                    locally destined packets */
 360 static int log_stp   = 0;   /* log STP state changes */
 361 static int bridge_inherit_mac = 0;   /* share MAC with first bridge member */
 362 TUNABLE_INT("net.link.bridge.pfil_onlyip", &pfil_onlyip);
 363 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW,
 364     &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled");
 365 TUNABLE_INT("net.link.bridge.ipfw_arp", &pfil_ipfw_arp);
 366 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW,
 367     &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2");
 368 TUNABLE_INT("net.link.bridge.pfil_bridge", &pfil_bridge);
 369 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW,
 370     &pfil_bridge, 0, "Packet filter on the bridge interface");
 371 TUNABLE_INT("net.link.bridge.pfil_member", &pfil_member);
 372 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW,
 373     &pfil_member, 0, "Packet filter on the member interface");
 374 TUNABLE_INT("net.link.bridge.pfil_local_phys", &pfil_local_phys);
 375 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW,
 376     &pfil_local_phys, 0,
 377     "Packet filter on the physical interface for locally destined packets");
 378 TUNABLE_INT("net.link.bridge.log_stp", &log_stp);
 379 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW,
 380     &log_stp, 0, "Log STP state changes");
 381 TUNABLE_INT("net.link.bridge.inherit_mac", &bridge_inherit_mac);
 382 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW,
 383     &bridge_inherit_mac, 0,
 384     "Inherit MAC address from the first bridge member");
 385
 386 struct bridge_control {
 387         int     (*bc_func)(struct bridge_softc *, void *);
 388         int     bc_argsize;
 389         int     bc_flags;
 390 };
 391
 392 #define BC_F_COPYIN             0x01    /* copy arguments in */
 393 #define BC_F_COPYOUT            0x02    /* copy arguments out */
 394 #define BC_F_SUSER              0x04    /* do super-user check */
 395
 396 const struct bridge_control bridge_control_table[] = {
 397         { bridge_ioctl_add,             sizeof(struct ifbreq),
 398           BC_F_COPYIN|BC_F_SUSER },
 399         { bridge_ioctl_del,             sizeof(struct ifbreq),
 400           BC_F_COPYIN|BC_F_SUSER },
 401
 402         { bridge_ioctl_gifflags,        sizeof(struct ifbreq),
 403           BC_F_COPYIN|BC_F_COPYOUT },
 404         { bridge_ioctl_sifflags,        sizeof(struct ifbreq),
 405           BC_F_COPYIN|BC_F_SUSER },
 406
 407         { bridge_ioctl_scache,          sizeof(struct ifbrparam),
 408           BC_F_COPYIN|BC_F_SUSER },
 409         { bridge_ioctl_gcache,          sizeof(struct ifbrparam),
 410           BC_F_COPYOUT },
 411
 412         { bridge_ioctl_gifs,            sizeof(struct ifbifconf),
 413           BC_F_COPYIN|BC_F_COPYOUT },
 414         { bridge_ioctl_rts,             sizeof(struct ifbaconf),
 415           BC_F_COPYIN|BC_F_COPYOUT },
 416
 417         { bridge_ioctl_saddr,           sizeof(struct ifbareq),
 418           BC_F_COPYIN|BC_F_SUSER },
 419
 420         { bridge_ioctl_sto,             sizeof(struct ifbrparam),
 421           BC_F_COPYIN|BC_F_SUSER },
 422         { bridge_ioctl_gto,             sizeof(struct ifbrparam),
 423           BC_F_COPYOUT },
 424
 425         { bridge_ioctl_daddr,           sizeof(struct ifbareq),
 426           BC_F_COPYIN|BC_F_SUSER },
 427
 428         { bridge_ioctl_flush,           sizeof(struct ifbreq),
 429           BC_F_COPYIN|BC_F_SUSER },
 430
 431         { bridge_ioctl_gpri,            sizeof(struct ifbrparam),
 432           BC_F_COPYOUT },
 433         { bridge_ioctl_spri,            sizeof(struct ifbrparam),
 434           BC_F_COPYIN|BC_F_SUSER },
 435
 436         { bridge_ioctl_ght,             sizeof(struct ifbrparam),
 437           BC_F_COPYOUT },
 438         { bridge_ioctl_sht,             sizeof(struct ifbrparam),
 439           BC_F_COPYIN|BC_F_SUSER },
 440
 441         { bridge_ioctl_gfd,             sizeof(struct ifbrparam),
 442           BC_F_COPYOUT },
 443         { bridge_ioctl_sfd,             sizeof(struct ifbrparam),
 444           BC_F_COPYIN|BC_F_SUSER },
 445
 446         { bridge_ioctl_gma,             sizeof(struct ifbrparam),
 447           BC_F_COPYOUT },
 448         { bridge_ioctl_sma,             sizeof(struct ifbrparam),
 449           BC_F_COPYIN|BC_F_SUSER },
 450
 451         { bridge_ioctl_sifprio,         sizeof(struct ifbreq),
 452           BC_F_COPYIN|BC_F_SUSER },
 453
 454         { bridge_ioctl_sifcost,         sizeof(struct ifbreq),
 455           BC_F_COPYIN|BC_F_SUSER },
 456
 457         { bridge_ioctl_addspan,         sizeof(struct ifbreq),
 458           BC_F_COPYIN|BC_F_SUSER },
 459         { bridge_ioctl_delspan,         sizeof(struct ifbreq),
 460           BC_F_COPYIN|BC_F_SUSER },
 461
 462         { bridge_ioctl_gbparam,         sizeof(struct ifbropreq),
 463           BC_F_COPYOUT },
 464
 465         { bridge_ioctl_grte,            sizeof(struct ifbrparam),
 466           BC_F_COPYOUT },
 467
 468         { bridge_ioctl_gifsstp,         sizeof(struct ifbpstpconf),
 469           BC_F_COPYIN|BC_F_COPYOUT },
 470
 471         { bridge_ioctl_sproto,          sizeof(struct ifbrparam),
 472           BC_F_COPYIN|BC_F_SUSER },
 473
 474         { bridge_ioctl_stxhc,           sizeof(struct ifbrparam),
 475           BC_F_COPYIN|BC_F_SUSER },
 476
 477         { bridge_ioctl_sifmaxaddr,      sizeof(struct ifbreq),
 478           BC_F_COPYIN|BC_F_SUSER },
 479
 480 };
 481 const int bridge_control_table_size =
 482     sizeof(bridge_control_table) / sizeof(bridge_control_table[0]);
 483
 484 LIST_HEAD(, bridge_softc) bridge_list;
 485
 486 IFC_SIMPLE_DECLARE(bridge, 0);
 487
 488 static int
 489 bridge_modevent(module_t mod, int type, void *data)
 490 {
 491
 492         switch (type) {
 493         case MOD_LOAD:
 494                 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF);
 495                 if_clone_attach(&bridge_cloner);
 496                 bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
 497                     sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
 498                     UMA_ALIGN_PTR, 0);
 499                 LIST_INIT(&bridge_list);
 500                 bridge_input_p = bridge_input;
 501                 bridge_output_p = bridge_output;
 502                 bridge_dn_p = bridge_dummynet;
 503                 bridge_linkstate_p = bridge_linkstate;
 504                 bridge_detach_cookie = EVENTHANDLER_REGISTER(
 505                     ifnet_departure_event, bridge_ifdetach, NULL,
 506                     EVENTHANDLER_PRI_ANY);
 507                 break;
 508         case MOD_UNLOAD:
 509                 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
 510                     bridge_detach_cookie);
 511                 if_clone_detach(&bridge_cloner);
 512                 uma_zdestroy(bridge_rtnode_zone);
 513                 bridge_input_p = NULL;
 514                 bridge_output_p = NULL;
 515                 bridge_dn_p = NULL;
 516                 bridge_linkstate_p = NULL;
 517                 mtx_destroy(&bridge_list_mtx);
 518                 break;
 519         default:
 520                 return (EOPNOTSUPP);
 521         }
 522         return (0);
 523 }
 524
 525 static moduledata_t bridge_mod = {
 526         "if_bridge",
 527         bridge_modevent,
 528         0
 529 };
 530
 531 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
 532 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
 533
 534 /*
 535  * handler for net.link.bridge.pfil_ipfw
 536  */
 537 static int
 538 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
 539 {
 540         int enable = pfil_ipfw;
 541         int error;
 542
 543         error = sysctl_handle_int(oidp, &enable, 0, req);
 544         enable = (enable) ? 1 : 0;
 545
 546         if (enable != pfil_ipfw) {
 547                 pfil_ipfw = enable;
 548
 549                 /*
 550                  * Disable pfil so that ipfw doesnt run twice, if the user
 551                  * really wants both then they can re-enable pfil_bridge and/or
 552                  * pfil_member. Also allow non-ip packets as ipfw can filter by
 553                  * layer2 type.
 554                  */
 555                 if (pfil_ipfw) {
 556                         pfil_onlyip = 0;
 557                         pfil_bridge = 0;
 558                         pfil_member = 0;
 559                 }
 560         }
 561
 562         return (error);
 563 }
 564 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW,
 565             &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW");
 566
 567 /*
 568  * bridge_clone_create:
 569  *
 570  *      Create a new bridge instance.
 571  */
 572 static int
 573 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
 574 {
 575         struct bridge_softc *sc, *sc2;
 576         struct ifnet *bifp, *ifp;
 577         int fb, retry;
 578         unsigned long hostid;
 579
 580         sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
 581         ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
 582         if (ifp == NULL) {
 583                 free(sc, M_DEVBUF);
 584                 return (ENOSPC);
 585         }
 586
 587         BRIDGE_LOCK_INIT(sc);
 588         sc->sc_brtmax = BRIDGE_RTABLE_MAX;
 589         sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
 590
 591         /* Initialize our routing table. */
 592         bridge_rtable_init(sc);
 593
 594         callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
 595
 596         LIST_INIT(&sc->sc_iflist);
 597         LIST_INIT(&sc->sc_spanlist);
 598
 599         ifp->if_softc = sc;
 600         if_initname(ifp, ifc->ifc_name, unit);
 601         ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
 602         ifp->if_ioctl = bridge_ioctl;
 603         ifp->if_start = bridge_start;
 604         ifp->if_init = bridge_init;
 605         ifp->if_type = IFT_BRIDGE;
 606         IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
 607         ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 608         IFQ_SET_READY(&ifp->if_snd);
 609
 610         /*
 611          * Generate an ethernet address with a locally administered address.
 612          *
 613          * Since we are using random ethernet addresses for the bridge, it is
 614          * possible that we might have address collisions, so make sure that
 615          * this hardware address isn't already in use on another bridge.
 616          * The first try uses the hostid and falls back to arc4rand().
 617          */
 618         fb = 0;
 619         getcredhostid(curthread->td_ucred, &hostid);
 620         for (retry = 1; retry != 0;) {
 621                 if (fb || hostid == 0) {
 622                         arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1);
 623                         sc->sc_defaddr[0] &= ~1;/* clear multicast bit */
 624                         sc->sc_defaddr[0] |= 2; /* set the LAA bit */
 625                 } else {
 626                         sc->sc_defaddr[0] = 0x2;
 627                         sc->sc_defaddr[1] = (hostid >> 24) & 0xff;
 628                         sc->sc_defaddr[2] = (hostid >> 16) & 0xff;
 629                         sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff;
 630                         sc->sc_defaddr[4] =  hostid        & 0xff;
 631                         sc->sc_defaddr[5] = ifp->if_dunit & 0xff;
 632                 }
 633
 634                 fb = 1;
 635                 retry = 0;
 636                 mtx_lock(&bridge_list_mtx);
 637                 LIST_FOREACH(sc2, &bridge_list, sc_list) {
 638                         bifp = sc2->sc_ifp;
 639                         if (memcmp(sc->sc_defaddr,
 640                             IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0)
 641                                 retry = 1;
 642                 }
 643                 mtx_unlock(&bridge_list_mtx);
 644         }
 645
 646         bstp_attach(&sc->sc_stp, &bridge_ops);
 647         ether_ifattach(ifp, sc->sc_defaddr);
 648         /* Now undo some of the damage... */
 649         ifp->if_baudrate = 0;
 650         ifp->if_type = IFT_BRIDGE;
 651
 652         mtx_lock(&bridge_list_mtx);
 653         LIST_INSERT_HEAD(&bridge_list, sc, sc_list);
 654         mtx_unlock(&bridge_list_mtx);
 655
 656         return (0);
 657 }
 658
 659 /*
 660  * bridge_clone_destroy:
 661  *
 662  *      Destroy a bridge instance.
 663  */
 664 static void
 665 bridge_clone_destroy(struct ifnet *ifp)
 666 {
 667         struct bridge_softc *sc = ifp->if_softc;
 668         struct bridge_iflist *bif;
 669
 670         BRIDGE_LOCK(sc);
 671
 672         bridge_stop(ifp, 1);
 673         ifp->if_flags &= ~IFF_UP;
 674
 675         while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
 676                 bridge_delete_member(sc, bif, 0);
 677
 678         while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
 679                 bridge_delete_span(sc, bif);
 680         }
 681
 682         BRIDGE_UNLOCK(sc);
 683
 684         callout_drain(&sc->sc_brcallout);
 685
 686         mtx_lock(&bridge_list_mtx);
 687         LIST_REMOVE(sc, sc_list);
 688         mtx_unlock(&bridge_list_mtx);
 689
 690         bstp_detach(&sc->sc_stp);
 691         ether_ifdetach(ifp);
 692         if_free_type(ifp, IFT_ETHER);
 693
 694         /* Tear down the routing table. */
 695         bridge_rtable_fini(sc);
 696
 697         BRIDGE_LOCK_DESTROY(sc);
 698         free(sc, M_DEVBUF);
 699 }
 700
 701 /*
 702  * bridge_ioctl:
 703  *
 704  *      Handle a control request from the operator.
 705  */
 706 static int
 707 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
 708 {
 709         struct bridge_softc *sc = ifp->if_softc;
 710         struct ifreq *ifr = (struct ifreq *)data;
 711         struct bridge_iflist *bif;
 712         struct thread *td = curthread;
 713         union {
 714                 struct ifbreq ifbreq;
 715                 struct ifbifconf ifbifconf;
 716                 struct ifbareq ifbareq;
 717                 struct ifbaconf ifbaconf;
 718                 struct ifbrparam ifbrparam;
 719                 struct ifbropreq ifbropreq;
 720         } args;
 721         struct ifdrv *ifd = (struct ifdrv *) data;
 722         const struct bridge_control *bc;
 723         int error = 0;
 724
 725         switch (cmd) {
 726
 727         case SIOCADDMULTI:
 728         case SIOCDELMULTI:
 729                 break;
 730
 731         case SIOCGDRVSPEC:
 732         case SIOCSDRVSPEC:
 733                 if (ifd->ifd_cmd >= bridge_control_table_size) {
 734                         error = EINVAL;
 735                         break;
 736                 }
 737                 bc = &bridge_control_table[ifd->ifd_cmd];
 738
 739                 if (cmd == SIOCGDRVSPEC &&
 740                     (bc->bc_flags & BC_F_COPYOUT) == 0) {
 741                         error = EINVAL;
 742                         break;
 743                 }
 744                 else if (cmd == SIOCSDRVSPEC &&
 745                     (bc->bc_flags & BC_F_COPYOUT) != 0) {
 746                         error = EINVAL;
 747                         break;
 748                 }
 749
 750                 if (bc->bc_flags & BC_F_SUSER) {
 751                         error = priv_check(td, PRIV_NET_BRIDGE);
 752                         if (error)
 753                                 break;
 754                 }
 755
 756                 if (ifd->ifd_len != bc->bc_argsize ||
 757                     ifd->ifd_len > sizeof(args)) {
 758                         error = EINVAL;
 759                         break;
 760                 }
 761
 762                 bzero(&args, sizeof(args));
 763                 if (bc->bc_flags & BC_F_COPYIN) {
 764                         error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
 765                         if (error)
 766                                 break;
 767                 }
 768
 769                 BRIDGE_LOCK(sc);
 770                 error = (*bc->bc_func)(sc, &args);
 771                 BRIDGE_UNLOCK(sc);
 772                 if (error)
 773                         break;
 774
 775                 if (bc->bc_flags & BC_F_COPYOUT)
 776                         error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
 777
 778                 break;
 779
 780         case SIOCSIFFLAGS:
 781                 if (!(ifp->if_flags & IFF_UP) &&
 782                     (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 783                         /*
 784                          * If interface is marked down and it is running,
 785                          * then stop and disable it.
 786                          */
 787                         BRIDGE_LOCK(sc);
 788                         bridge_stop(ifp, 1);
 789                         BRIDGE_UNLOCK(sc);
 790                 } else if ((ifp->if_flags & IFF_UP) &&
 791                     !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 792                         /*
 793                          * If interface is marked up and it is stopped, then
 794                          * start it.
 795                          */
 796                         (*ifp->if_init)(sc);
 797                 }
 798                 break;
 799
 800         case SIOCSIFMTU:
 801                 if (ifr->ifr_mtu < 576) {
 802                         error = EINVAL;
 803                         break;
 804                 }
 805                 if (LIST_EMPTY(&sc->sc_iflist)) {
 806                         sc->sc_ifp->if_mtu = ifr->ifr_mtu;
 807                         break;
 808                 }
 809                 BRIDGE_LOCK(sc);
 810                 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 811                         if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) {
 812                                 log(LOG_NOTICE, "%s: invalid MTU: %lu(%s)"
 813                                     " != %d\n", sc->sc_ifp->if_xname,
 814                                     bif->bif_ifp->if_mtu,
 815                                     bif->bif_ifp->if_xname, ifr->ifr_mtu);
 816                                 error = EINVAL;
 817                                 break;
 818                         }
 819                 }
 820                 if (!error)
 821                         sc->sc_ifp->if_mtu = ifr->ifr_mtu;
 822                 BRIDGE_UNLOCK(sc);
 823                 break;
 824         default:
 825                 /*
 826                  * drop the lock as ether_ioctl() will call bridge_start() and
 827                  * cause the lock to be recursed.
 828                  */
 829                 error = ether_ioctl(ifp, cmd, data);
 830                 break;
 831         }
 832
 833         return (error);
 834 }
 835
 836 /*
 837  * bridge_mutecaps:
 838  *
 839  *      Clear or restore unwanted capabilities on the member interface
 840  */
 841 static void
 842 bridge_mutecaps(struct bridge_softc *sc)
 843 {
 844         struct bridge_iflist *bif;
 845         int enabled, mask;
 846
 847         /* Initial bitmask of capabilities to test */
 848         mask = BRIDGE_IFCAPS_MASK;
 849
 850         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 851                 /* Every member must support it or its disabled */
 852                 mask &= bif->bif_savedcaps;
 853         }
 854
 855         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 856                 enabled = bif->bif_ifp->if_capenable;
 857                 enabled &= ~BRIDGE_IFCAPS_STRIP;
 858                 /* strip off mask bits and enable them again if allowed */
 859                 enabled &= ~BRIDGE_IFCAPS_MASK;
 860                 enabled |= mask;
 861                 bridge_set_ifcap(sc, bif, enabled);
 862         }
 863
 864 }
 865
 866 static void
 867 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
 868 {
 869         struct ifnet *ifp = bif->bif_ifp;
 870         struct ifreq ifr;
 871         int error;
 872
 873         bzero(&ifr, sizeof(ifr));
 874         ifr.ifr_reqcap = set;
 875
 876         if (ifp->if_capenable != set) {
 877                 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
 878                 if (error)
 879                         if_printf(sc->sc_ifp,
 880                             "error setting interface capabilities on %s\n",
 881                             ifp->if_xname);
 882         }
 883 }
 884
 885 /*
 886  * bridge_lookup_member:
 887  *
 888  *      Lookup a bridge member interface.
 889  */
 890 static struct bridge_iflist *
 891 bridge_lookup_member(struct bridge_softc *sc, const char *name)
 892 {
 893         struct bridge_iflist *bif;
 894         struct ifnet *ifp;
 895
 896         BRIDGE_LOCK_ASSERT(sc);
 897
 898         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 899                 ifp = bif->bif_ifp;
 900                 if (strcmp(ifp->if_xname, name) == 0)
 901                         return (bif);
 902         }
 903
 904         return (NULL);
 905 }
 906
 907 /*
 908  * bridge_lookup_member_if:
 909  *
 910  *      Lookup a bridge member interface by ifnet*.
 911  */
 912 static struct bridge_iflist *
 913 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
 914 {
 915         struct bridge_iflist *bif;
 916
 917         BRIDGE_LOCK_ASSERT(sc);
 918
 919         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 920                 if (bif->bif_ifp == member_ifp)
 921                         return (bif);
 922         }
 923
 924         return (NULL);
 925 }
 926
 927 /*
 928  * bridge_delete_member:
 929  *
 930  *      Delete the specified member interface.
 931  */
 932 static void
 933 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
 934     int gone)
 935 {
 936         struct ifnet *ifs = bif->bif_ifp;
 937         struct ifnet *fif = NULL;
 938
 939         BRIDGE_LOCK_ASSERT(sc);
 940
 941         if (bif->bif_flags & IFBIF_STP)
 942                 bstp_disable(&bif->bif_stp);
 943
 944         ifs->if_bridge = NULL;
 945         BRIDGE_XLOCK(sc);
 946         LIST_REMOVE(bif, bif_next);
 947         BRIDGE_XDROP(sc);
 948
 949         /*
 950          * If removing the interface that gave the bridge its mac address, set
 951          * the mac address of the bridge to the address of the next member, or
 952          * to its default address if no members are left.
 953          */
 954         if (bridge_inherit_mac && sc->sc_ifaddr == ifs) {
 955                 if (LIST_EMPTY(&sc->sc_iflist)) {
 956                         bcopy(sc->sc_defaddr,
 957                             IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
 958                         sc->sc_ifaddr = NULL;
 959                 } else {
 960                         fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp;
 961                         bcopy(IF_LLADDR(fif),
 962                             IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
 963                         sc->sc_ifaddr = fif;
 964                 }
 965                 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
 966         }
 967
 968         bridge_linkcheck(sc);
 969         bridge_mutecaps(sc);    /* recalcuate now this interface is removed */
 970         bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
 971         KASSERT(bif->bif_addrcnt == 0,
 972             ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
 973
 974         BRIDGE_UNLOCK(sc);
 975         if (!gone) {
 976                 switch (ifs->if_type) {
 977                 case IFT_ETHER:
 978                 case IFT_L2VLAN:
 979                         /*
 980                          * Take the interface out of promiscuous mode.
 981                          */
 982                         (void) ifpromisc(ifs, 0);
 983                         break;
 984
 985                 case IFT_GIF:
 986                         break;
 987
 988                 default:
 989 #ifdef DIAGNOSTIC
 990                         panic("bridge_delete_member: impossible");
 991 #endif
 992                         break;
 993                 }
 994                 /* reneable any interface capabilities */
 995                 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
 996         }
 997         bstp_destroy(&bif->bif_stp);    /* prepare to free */
 998         BRIDGE_LOCK(sc);
 999         free(bif, M_DEVBUF);
1000 }
1001
1002 /*
1003  * bridge_delete_span:
1004  *
1005  *      Delete the specified span interface.
1006  */
1007 static void
1008 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1009 {
1010         BRIDGE_LOCK_ASSERT(sc);
1011
1012         KASSERT(bif->bif_ifp->if_bridge == NULL,
1013             ("%s: not a span interface", __func__));
1014
1015         LIST_REMOVE(bif, bif_next);
1016         free(bif, M_DEVBUF);
1017 }
1018
1019 static int
1020 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1021 {
1022         struct ifbreq *req = arg;
1023         struct bridge_iflist *bif = NULL;
1024         struct ifnet *ifs;
1025         int error = 0;
1026
1027         ifs = ifunit(req->ifbr_ifsname);
1028         if (ifs == NULL)
1029                 return (ENOENT);
1030         if (ifs->if_ioctl == NULL)      /* must be supported */
1031                 return (EINVAL);
1032
1033         /* If it's in the span list, it can't be a member. */
1034         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1035                 if (ifs == bif->bif_ifp)
1036                         return (EBUSY);
1037
1038         if (ifs->if_bridge == sc)
1039                 return (EEXIST);
1040
1041         if (ifs->if_bridge != NULL)
1042                 return (EBUSY);
1043
1044         bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1045         if (bif == NULL)
1046                 return (ENOMEM);
1047
1048         bif->bif_ifp = ifs;
1049         bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1050         bif->bif_savedcaps = ifs->if_capenable;
1051
1052         switch (ifs->if_type) {
1053         case IFT_ETHER:
1054         case IFT_L2VLAN:
1055         case IFT_GIF:
1056                 /* permitted interface types */
1057                 break;
1058         default:
1059                 error = EINVAL;
1060                 goto out;
1061         }
1062
1063         /* Allow the first Ethernet member to define the MTU */
1064         if (LIST_EMPTY(&sc->sc_iflist))
1065                 sc->sc_ifp->if_mtu = ifs->if_mtu;
1066         else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
1067                 if_printf(sc->sc_ifp, "invalid MTU: %lu(%s) != %lu\n",
1068                     ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu);
1069                 error = EINVAL;
1070                 goto out;
1071         }
1072
1073         /*
1074          * Assign the interface's MAC address to the bridge if it's the first
1075          * member and the MAC address of the bridge has not been changed from
1076          * the default randomly generated one.
1077          */
1078         if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) &&
1079             !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) {
1080                 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1081                 sc->sc_ifaddr = ifs;
1082                 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1083         }
1084
1085         ifs->if_bridge = sc;
1086         bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1087         /*
1088          * XXX: XLOCK HERE!?!
1089          *
1090          * NOTE: insert_***HEAD*** should be safe for the traversals.
1091          */
1092         LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1093
1094         /* Set interface capabilities to the intersection set of all members */
1095         bridge_mutecaps(sc);
1096         bridge_linkcheck(sc);
1097
1098         /* Place the interface into promiscuous mode */
1099         switch (ifs->if_type) {
1100                 case IFT_ETHER:
1101                 case IFT_L2VLAN:
1102                         BRIDGE_UNLOCK(sc);
1103                         error = ifpromisc(ifs, 1);
1104                         BRIDGE_LOCK(sc);
1105                         break;
1106         }
1107         if (error)
1108                 bridge_delete_member(sc, bif, 0);
1109 out:
1110         if (error) {
1111                 if (bif != NULL)
1112                         free(bif, M_DEVBUF);
1113         }
1114         return (error);
1115 }
1116
1117 static int
1118 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1119 {
1120         struct ifbreq *req = arg;
1121         struct bridge_iflist *bif;
1122
1123         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1124         if (bif == NULL)
1125                 return (ENOENT);
1126
1127         bridge_delete_member(sc, bif, 0);
1128
1129         return (0);
1130 }
1131
1132 static int
1133 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1134 {
1135         struct ifbreq *req = arg;
1136         struct bridge_iflist *bif;
1137         struct bstp_port *bp;
1138
1139         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1140         if (bif == NULL)
1141                 return (ENOENT);
1142
1143         bp = &bif->bif_stp;
1144         req->ifbr_ifsflags = bif->bif_flags;
1145         req->ifbr_state = bp->bp_state;
1146         req->ifbr_priority = bp->bp_priority;
1147         req->ifbr_path_cost = bp->bp_path_cost;
1148         req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1149         req->ifbr_proto = bp->bp_protover;
1150         req->ifbr_role = bp->bp_role;
1151         req->ifbr_stpflags = bp->bp_flags;
1152         req->ifbr_addrcnt = bif->bif_addrcnt;
1153         req->ifbr_addrmax = bif->bif_addrmax;
1154         req->ifbr_addrexceeded = bif->bif_addrexceeded;
1155
1156         /* Copy STP state options as flags */
1157         if (bp->bp_operedge)
1158                 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1159         if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1160                 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1161         if (bp->bp_ptp_link)
1162                 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1163         if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1164                 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1165         if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1166                 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1167         if (bp->bp_flags & BSTP_PORT_ADMCOST)
1168                 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1169         return (0);
1170 }
1171
1172 static int
1173 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1174 {
1175         struct ifbreq *req = arg;
1176         struct bridge_iflist *bif;
1177         struct bstp_port *bp;
1178         int error;
1179
1180         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1181         if (bif == NULL)
1182                 return (ENOENT);
1183         bp = &bif->bif_stp;
1184
1185         if (req->ifbr_ifsflags & IFBIF_SPAN)
1186                 /* SPAN is readonly */
1187                 return (EINVAL);
1188
1189         if (req->ifbr_ifsflags & IFBIF_STP) {
1190                 if ((bif->bif_flags & IFBIF_STP) == 0) {
1191                         error = bstp_enable(&bif->bif_stp);
1192                         if (error)
1193                                 return (error);
1194                 }
1195         } else {
1196                 if ((bif->bif_flags & IFBIF_STP) != 0)
1197                         bstp_disable(&bif->bif_stp);
1198         }
1199
1200         /* Pass on STP flags */
1201         bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1202         bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1203         bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1204         bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1205
1206         /* Save the bits relating to the bridge */
1207         bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1208
1209         return (0);
1210 }
1211
1212 static int
1213 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1214 {
1215         struct ifbrparam *param = arg;
1216
1217         sc->sc_brtmax = param->ifbrp_csize;
1218         bridge_rttrim(sc);
1219
1220         return (0);
1221 }
1222
1223 static int
1224 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1225 {
1226         struct ifbrparam *param = arg;
1227
1228         param->ifbrp_csize = sc->sc_brtmax;
1229
1230         return (0);
1231 }
1232
1233 static int
1234 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1235 {
1236         struct ifbifconf *bifc = arg;
1237         struct bridge_iflist *bif;
1238         struct ifbreq breq;
1239         char *buf, *outbuf;
1240         int count, buflen, len, error = 0;
1241
1242         count = 0;
1243         LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1244                 count++;
1245         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1246                 count++;
1247
1248         buflen = sizeof(breq) * count;
1249         if (bifc->ifbic_len == 0) {
1250                 bifc->ifbic_len = buflen;
1251                 return (0);
1252         }
1253         BRIDGE_UNLOCK(sc);
1254         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1255         BRIDGE_LOCK(sc);
1256
1257         count = 0;
1258         buf = outbuf;
1259         len = min(bifc->ifbic_len, buflen);
1260         bzero(&breq, sizeof(breq));
1261         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1262                 if (len < sizeof(breq))
1263                         break;
1264
1265                 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1266                     sizeof(breq.ifbr_ifsname));
1267                 /* Fill in the ifbreq structure */
1268                 error = bridge_ioctl_gifflags(sc, &breq);
1269                 if (error)
1270                         break;
1271                 memcpy(buf, &breq, sizeof(breq));
1272                 count++;
1273                 buf += sizeof(breq);
1274                 len -= sizeof(breq);
1275         }
1276         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1277                 if (len < sizeof(breq))
1278                         break;
1279
1280                 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1281                     sizeof(breq.ifbr_ifsname));
1282                 breq.ifbr_ifsflags = bif->bif_flags;
1283                 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1284                 memcpy(buf, &breq, sizeof(breq));
1285                 count++;
1286                 buf += sizeof(breq);
1287                 len -= sizeof(breq);
1288         }
1289
1290         BRIDGE_UNLOCK(sc);
1291         bifc->ifbic_len = sizeof(breq) * count;
1292         error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1293         BRIDGE_LOCK(sc);
1294         free(outbuf, M_TEMP);
1295         return (error);
1296 }
1297
1298 static int
1299 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1300 {
1301         struct ifbaconf *bac = arg;
1302         struct bridge_rtnode *brt;
1303         struct ifbareq bareq;
1304         char *buf, *outbuf;
1305         int count, buflen, len, error = 0;
1306
1307         if (bac->ifbac_len == 0)
1308                 return (0);
1309
1310         count = 0;
1311         LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1312                 count++;
1313         buflen = sizeof(bareq) * count;
1314
1315         BRIDGE_UNLOCK(sc);
1316         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1317         BRIDGE_LOCK(sc);
1318
1319         count = 0;
1320         buf = outbuf;
1321         len = min(bac->ifbac_len, buflen);
1322         bzero(&bareq, sizeof(bareq));
1323         LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1324                 if (len < sizeof(bareq))
1325                         goto out;
1326                 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1327                     sizeof(bareq.ifba_ifsname));
1328                 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1329                 bareq.ifba_vlan = brt->brt_vlan;
1330                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1331                                 time_uptime < brt->brt_expire)
1332                         bareq.ifba_expire = brt->brt_expire - time_uptime;
1333                 else
1334                         bareq.ifba_expire = 0;
1335                 bareq.ifba_flags = brt->brt_flags;
1336
1337                 memcpy(buf, &bareq, sizeof(bareq));
1338                 count++;
1339                 buf += sizeof(bareq);
1340                 len -= sizeof(bareq);
1341         }
1342 out:
1343         BRIDGE_UNLOCK(sc);
1344         bac->ifbac_len = sizeof(bareq) * count;
1345         error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1346         BRIDGE_LOCK(sc);
1347         free(outbuf, M_TEMP);
1348         return (error);
1349 }
1350
1351 static int
1352 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1353 {
1354         struct ifbareq *req = arg;
1355         struct bridge_iflist *bif;
1356         int error;
1357
1358         bif = bridge_lookup_member(sc, req->ifba_ifsname);
1359         if (bif == NULL)
1360                 return (ENOENT);
1361
1362         error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1363             req->ifba_flags);
1364
1365         return (error);
1366 }
1367
1368 static int
1369 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1370 {
1371         struct ifbrparam *param = arg;
1372
1373         sc->sc_brttimeout = param->ifbrp_ctime;
1374         return (0);
1375 }
1376
1377 static int
1378 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1379 {
1380         struct ifbrparam *param = arg;
1381
1382         param->ifbrp_ctime = sc->sc_brttimeout;
1383         return (0);
1384 }
1385
1386 static int
1387 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1388 {
1389         struct ifbareq *req = arg;
1390
1391         return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
1392 }
1393
1394 static int
1395 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1396 {
1397         struct ifbreq *req = arg;
1398
1399         bridge_rtflush(sc, req->ifbr_ifsflags);
1400         return (0);
1401 }
1402
1403 static int
1404 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1405 {
1406         struct ifbrparam *param = arg;
1407         struct bstp_state *bs = &sc->sc_stp;
1408
1409         param->ifbrp_prio = bs->bs_bridge_priority;
1410         return (0);
1411 }
1412
1413 static int
1414 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1415 {
1416         struct ifbrparam *param = arg;
1417
1418         return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1419 }
1420
1421 static int
1422 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1423 {
1424         struct ifbrparam *param = arg;
1425         struct bstp_state *bs = &sc->sc_stp;
1426
1427         param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1428         return (0);
1429 }
1430
1431 static int
1432 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1433 {
1434         struct ifbrparam *param = arg;
1435
1436         return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1437 }
1438
1439 static int
1440 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1441 {
1442         struct ifbrparam *param = arg;
1443         struct bstp_state *bs = &sc->sc_stp;
1444
1445         param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1446         return (0);
1447 }
1448
1449 static int
1450 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1451 {
1452         struct ifbrparam *param = arg;
1453
1454         return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1455 }
1456
1457 static int
1458 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1459 {
1460         struct ifbrparam *param = arg;
1461         struct bstp_state *bs = &sc->sc_stp;
1462
1463         param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1464         return (0);
1465 }
1466
1467 static int
1468 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1469 {
1470         struct ifbrparam *param = arg;
1471
1472         return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1473 }
1474
1475 static int
1476 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1477 {
1478         struct ifbreq *req = arg;
1479         struct bridge_iflist *bif;
1480
1481         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1482         if (bif == NULL)
1483                 return (ENOENT);
1484
1485         return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1486 }
1487
1488 static int
1489 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1490 {
1491         struct ifbreq *req = arg;
1492         struct bridge_iflist *bif;
1493
1494         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1495         if (bif == NULL)
1496                 return (ENOENT);
1497
1498         return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1499 }
1500
1501 static int
1502 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1503 {
1504         struct ifbreq *req = arg;
1505         struct bridge_iflist *bif;
1506
1507         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1508         if (bif == NULL)
1509                 return (ENOENT);
1510
1511         bif->bif_addrmax = req->ifbr_addrmax;
1512         return (0);
1513 }
1514
1515 static int
1516 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1517 {
1518         struct ifbreq *req = arg;
1519         struct bridge_iflist *bif = NULL;
1520         struct ifnet *ifs;
1521
1522         ifs = ifunit(req->ifbr_ifsname);
1523         if (ifs == NULL)
1524                 return (ENOENT);
1525
1526         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1527                 if (ifs == bif->bif_ifp)
1528                         return (EBUSY);
1529
1530         if (ifs->if_bridge != NULL)
1531                 return (EBUSY);
1532
1533         switch (ifs->if_type) {
1534                 case IFT_ETHER:
1535                 case IFT_GIF:
1536                 case IFT_L2VLAN:
1537                         break;
1538                 default:
1539                         return (EINVAL);
1540         }
1541
1542         bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1543         if (bif == NULL)
1544                 return (ENOMEM);
1545
1546         bif->bif_ifp = ifs;
1547         bif->bif_flags = IFBIF_SPAN;
1548
1549         LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1550
1551         return (0);
1552 }
1553
1554 static int
1555 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1556 {
1557         struct ifbreq *req = arg;
1558         struct bridge_iflist *bif;
1559         struct ifnet *ifs;
1560
1561         ifs = ifunit(req->ifbr_ifsname);
1562         if (ifs == NULL)
1563                 return (ENOENT);
1564
1565         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1566                 if (ifs == bif->bif_ifp)
1567                         break;
1568
1569         if (bif == NULL)
1570                 return (ENOENT);
1571
1572         bridge_delete_span(sc, bif);
1573
1574         return (0);
1575 }
1576
1577 static int
1578 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1579 {
1580         struct ifbropreq *req = arg;
1581         struct bstp_state *bs = &sc->sc_stp;
1582         struct bstp_port *root_port;
1583
1584         req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1585         req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1586         req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1587
1588         root_port = bs->bs_root_port;
1589         if (root_port == NULL)
1590                 req->ifbop_root_port = 0;
1591         else
1592                 req->ifbop_root_port = root_port->bp_ifp->if_index;
1593
1594         req->ifbop_holdcount = bs->bs_txholdcount;
1595         req->ifbop_priority = bs->bs_bridge_priority;
1596         req->ifbop_protocol = bs->bs_protover;
1597         req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1598         req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1599         req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1600         req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1601         req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1602         req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1603
1604         return (0);
1605 }
1606
1607 static int
1608 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1609 {
1610         struct ifbrparam *param = arg;
1611
1612         param->ifbrp_cexceeded = sc->sc_brtexceeded;
1613         return (0);
1614 }
1615
1616 static int
1617 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1618 {
1619         struct ifbpstpconf *bifstp = arg;
1620         struct bridge_iflist *bif;
1621         struct bstp_port *bp;
1622         struct ifbpstpreq bpreq;
1623         char *buf, *outbuf;
1624         int count, buflen, len, error = 0;
1625
1626         count = 0;
1627         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1628                 if ((bif->bif_flags & IFBIF_STP) != 0)
1629                         count++;
1630         }
1631
1632         buflen = sizeof(bpreq) * count;
1633         if (bifstp->ifbpstp_len == 0) {
1634                 bifstp->ifbpstp_len = buflen;
1635                 return (0);
1636         }
1637
1638         BRIDGE_UNLOCK(sc);
1639         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1640         BRIDGE_LOCK(sc);
1641
1642         count = 0;
1643         buf = outbuf;
1644         len = min(bifstp->ifbpstp_len, buflen);
1645         bzero(&bpreq, sizeof(bpreq));
1646         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1647                 if (len < sizeof(bpreq))
1648                         break;
1649
1650                 if ((bif->bif_flags & IFBIF_STP) == 0)
1651                         continue;
1652
1653                 bp = &bif->bif_stp;
1654                 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1655                 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1656                 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1657                 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1658                 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1659                 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1660
1661                 memcpy(buf, &bpreq, sizeof(bpreq));
1662                 count++;
1663                 buf += sizeof(bpreq);
1664                 len -= sizeof(bpreq);
1665         }
1666
1667         BRIDGE_UNLOCK(sc);
1668         bifstp->ifbpstp_len = sizeof(bpreq) * count;
1669         error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1670         BRIDGE_LOCK(sc);
1671         free(outbuf, M_TEMP);
1672         return (error);
1673 }
1674
1675 static int
1676 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1677 {
1678         struct ifbrparam *param = arg;
1679
1680         return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1681 }
1682
1683 static int
1684 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1685 {
1686         struct ifbrparam *param = arg;
1687
1688         return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1689 }
1690
1691 /*
1692  * bridge_ifdetach:
1693  *
1694  *      Detach an interface from a bridge.  Called when a member
1695  *      interface is detaching.
1696  */
1697 static void
1698 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1699 {
1700         struct bridge_softc *sc = ifp->if_bridge;
1701         struct bridge_iflist *bif;
1702
1703         /* Check if the interface is a bridge member */
1704         if (sc != NULL) {
1705                 BRIDGE_LOCK(sc);
1706
1707                 bif = bridge_lookup_member_if(sc, ifp);
1708                 if (bif != NULL)
1709                         bridge_delete_member(sc, bif, 1);
1710
1711                 BRIDGE_UNLOCK(sc);
1712                 return;
1713         }
1714
1715         /* Check if the interface is a span port */
1716         mtx_lock(&bridge_list_mtx);
1717         LIST_FOREACH(sc, &bridge_list, sc_list) {
1718                 BRIDGE_LOCK(sc);
1719                 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1720                         if (ifp == bif->bif_ifp) {
1721                                 bridge_delete_span(sc, bif);
1722                                 break;
1723                         }
1724
1725                 BRIDGE_UNLOCK(sc);
1726         }
1727         mtx_unlock(&bridge_list_mtx);
1728 }
1729
1730 /*
1731  * bridge_init:
1732  *
1733  *      Initialize a bridge interface.
1734  */
1735 static void
1736 bridge_init(void *xsc)
1737 {
1738         struct bridge_softc *sc = (struct bridge_softc *)xsc;
1739         struct ifnet *ifp = sc->sc_ifp;
1740
1741         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1742                 return;
1743
1744         BRIDGE_LOCK(sc);
1745         callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1746             bridge_timer, sc);
1747
1748         ifp->if_drv_flags |= IFF_DRV_RUNNING;
1749         bstp_init(&sc->sc_stp);         /* Initialize Spanning Tree */
1750
1751         BRIDGE_UNLOCK(sc);
1752 }
1753
1754 /*
1755  * bridge_stop:
1756  *
1757  *      Stop the bridge interface.
1758  */
1759 static void
1760 bridge_stop(struct ifnet *ifp, int disable)
1761 {
1762         struct bridge_softc *sc = ifp->if_softc;
1763
1764         BRIDGE_LOCK_ASSERT(sc);
1765
1766         if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1767                 return;
1768
1769         callout_stop(&sc->sc_brcallout);
1770         bstp_stop(&sc->sc_stp);
1771
1772         bridge_rtflush(sc, IFBF_FLUSHDYN);
1773
1774         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1775 }
1776
1777 /*
1778  * bridge_enqueue:
1779  *
1780  *      Enqueue a packet on a bridge member interface.
1781  *
1782  */
1783 static void
1784 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
1785 {
1786         int len, err = 0;
1787         short mflags;
1788         struct mbuf *m0;
1789
1790         len = m->m_pkthdr.len;
1791         mflags = m->m_flags;
1792
1793         /* We may be sending a fragment so traverse the mbuf */
1794         for (; m; m = m0) {
1795                 m0 = m->m_nextpkt;
1796                 m->m_nextpkt = NULL;
1797
1798                 /*
1799                  * If underlying interface can not do VLAN tag insertion itself
1800                  * then attach a packet tag that holds it.
1801                  */
1802                 if ((m->m_flags & M_VLANTAG) &&
1803                     (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
1804                         m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
1805                         if (m == NULL) {
1806                                 if_printf(dst_ifp,
1807                                     "unable to prepend VLAN header\n");
1808                                 dst_ifp->if_oerrors++;
1809                                 continue;
1810                         }
1811                         m->m_flags &= ~M_VLANTAG;
1812                 }
1813
1814                 if (err == 0)
1815                         dst_ifp->if_transmit(dst_ifp, m);
1816         }
1817
1818         if (err == 0) {
1819                 sc->sc_ifp->if_opackets++;
1820                 sc->sc_ifp->if_obytes += len;
1821                 if (mflags & M_MCAST)
1822                         sc->sc_ifp->if_omcasts++;
1823         }
1824 }
1825
1826 /*
1827  * bridge_dummynet:
1828  *
1829  *      Receive a queued packet from dummynet and pass it on to the output
1830  *      interface.
1831  *
1832  *      The mbuf has the Ethernet header already attached.
1833  */
1834 static void
1835 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
1836 {
1837         struct bridge_softc *sc;
1838
1839         sc = ifp->if_bridge;
1840
1841         /*
1842          * The packet didnt originate from a member interface. This should only
1843          * ever happen if a member interface is removed while packets are
1844          * queued for it.
1845          */
1846         if (sc == NULL) {
1847                 m_freem(m);
1848                 return;
1849         }
1850
1851         if (PFIL_HOOKED(&V_inet_pfil_hook)
1852 #ifdef INET6
1853             || PFIL_HOOKED(&V_inet6_pfil_hook)
1854 #endif
1855             ) {
1856                 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
1857                         return;
1858                 if (m == NULL)
1859                         return;
1860         }
1861
1862         bridge_enqueue(sc, ifp, m);
1863 }
1864
1865 /*
1866  * bridge_output:
1867  *
1868  *      Send output from a bridge member interface.  This
1869  *      performs the bridging function for locally originated
1870  *      packets.
1871  *
1872  *      The mbuf has the Ethernet header already attached.  We must
1873  *      enqueue or free the mbuf before returning.
1874  */
1875 static int
1876 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
1877     struct rtentry *rt)
1878 {
1879         struct ether_header *eh;
1880         struct ifnet *dst_if;
1881         struct bridge_softc *sc;
1882         uint16_t vlan;
1883
1884         if (m->m_len < ETHER_HDR_LEN) {
1885                 m = m_pullup(m, ETHER_HDR_LEN);
1886                 if (m == NULL)
1887                         return (0);
1888         }
1889
1890         eh = mtod(m, struct ether_header *);
1891         sc = ifp->if_bridge;
1892         vlan = VLANTAGOF(m);
1893
1894         BRIDGE_LOCK(sc);
1895
1896         /*
1897          * If bridge is down, but the original output interface is up,
1898          * go ahead and send out that interface.  Otherwise, the packet
1899          * is dropped below.
1900          */
1901         if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1902                 dst_if = ifp;
1903                 goto sendunicast;
1904         }
1905
1906         /*
1907          * If the packet is a multicast, or we don't know a better way to
1908          * get there, send to all interfaces.
1909          */
1910         if (ETHER_IS_MULTICAST(eh->ether_dhost))
1911                 dst_if = NULL;
1912         else
1913                 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
1914         if (dst_if == NULL) {
1915                 struct bridge_iflist *bif;
1916                 struct mbuf *mc;
1917                 int error = 0, used = 0;
1918
1919                 bridge_span(sc, m);
1920
1921                 BRIDGE_LOCK2REF(sc, error);
1922                 if (error) {
1923                         m_freem(m);
1924                         return (0);
1925                 }
1926
1927                 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1928                         dst_if = bif->bif_ifp;
1929
1930                         if (dst_if->if_type == IFT_GIF)
1931                                 continue;
1932                         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
1933                                 continue;
1934
1935                         /*
1936                          * If this is not the original output interface,
1937                          * and the interface is participating in spanning
1938                          * tree, make sure the port is in a state that
1939                          * allows forwarding.
1940                          */
1941                         if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
1942                             bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
1943                                 continue;
1944
1945                         if (LIST_NEXT(bif, bif_next) == NULL) {
1946                                 used = 1;
1947                                 mc = m;
1948                         } else {
1949                                 mc = m_copypacket(m, M_DONTWAIT);
1950                                 if (mc == NULL) {
1951                                         sc->sc_ifp->if_oerrors++;
1952                                         continue;
1953                                 }
1954                         }
1955
1956                         bridge_enqueue(sc, dst_if, mc);
1957                 }
1958                 if (used == 0)
1959                         m_freem(m);
1960                 BRIDGE_UNREF(sc);
1961                 return (0);
1962         }
1963
1964 sendunicast:
1965         /*
1966          * XXX Spanning tree consideration here?
1967          */
1968
1969         bridge_span(sc, m);
1970         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1971                 m_freem(m);
1972                 BRIDGE_UNLOCK(sc);
1973                 return (0);
1974         }
1975
1976         BRIDGE_UNLOCK(sc);
1977         bridge_enqueue(sc, dst_if, m);
1978         return (0);
1979 }
1980
1981 /*
1982  * bridge_start:
1983  *
1984  *      Start output on a bridge.
1985  *
1986  */
1987 static void
1988 bridge_start(struct ifnet *ifp)
1989 {
1990         struct bridge_softc *sc;
1991         struct mbuf *m;
1992         struct ether_header *eh;
1993         struct ifnet *dst_if;
1994
1995         sc = ifp->if_softc;
1996
1997         ifp->if_drv_flags |= IFF_DRV_OACTIVE;
1998         for (;;) {
1999                 IFQ_DEQUEUE(&ifp->if_snd, m);
2000                 if (m == 0)
2001                         break;
2002                 ETHER_BPF_MTAP(ifp, m);
2003
2004                 eh = mtod(m, struct ether_header *);
2005                 dst_if = NULL;
2006
2007                 BRIDGE_LOCK(sc);
2008                 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2009                         dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1);
2010                 }
2011
2012                 if (dst_if == NULL)
2013                         bridge_broadcast(sc, ifp, m, 0);
2014                 else {
2015                         BRIDGE_UNLOCK(sc);
2016                         bridge_enqueue(sc, dst_if, m);
2017                 }
2018         }
2019         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
2020 }
2021
2022 /*
2023  * bridge_forward:
2024  *
2025  *      The forwarding function of the bridge.
2026  *
2027  *      NOTE: Releases the lock on return.
2028  */
2029 static void
2030 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
2031     struct mbuf *m)
2032 {
2033         struct bridge_iflist *dbif;
2034         struct ifnet *src_if, *dst_if, *ifp;
2035         struct ether_header *eh;
2036         uint16_t vlan;
2037         uint8_t *dst;
2038         int error;
2039
2040         src_if = m->m_pkthdr.rcvif;
2041         ifp = sc->sc_ifp;
2042
2043         ifp->if_ipackets++;
2044         ifp->if_ibytes += m->m_pkthdr.len;
2045         vlan = VLANTAGOF(m);
2046
2047         if ((sbif->bif_flags & IFBIF_STP) &&
2048             sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2049                 goto drop;
2050
2051         eh = mtod(m, struct ether_header *);
2052         dst = eh->ether_dhost;
2053
2054         /* If the interface is learning, record the address. */
2055         if (sbif->bif_flags & IFBIF_LEARNING) {
2056                 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2057                     sbif, 0, IFBAF_DYNAMIC);
2058                 /*
2059                  * If the interface has addresses limits then deny any source
2060                  * that is not in the cache.
2061                  */
2062                 if (error && sbif->bif_addrmax)
2063                         goto drop;
2064         }
2065
2066         if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2067             sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2068                 goto drop;
2069
2070         /*
2071          * At this point, the port either doesn't participate
2072          * in spanning tree or it is in the forwarding state.
2073          */
2074
2075         /*
2076          * If the packet is unicast, destined for someone on
2077          * "this" side of the bridge, drop it.
2078          */
2079         if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2080                 dst_if = bridge_rtlookup(sc, dst, vlan);
2081                 if (src_if == dst_if)
2082                         goto drop;
2083         } else {
2084                 /*
2085                  * Check if its a reserved multicast address, any address
2086                  * listed in 802.1D section 7.12.6 may not be forwarded by the
2087                  * bridge.
2088                  * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2089                  */
2090                 if (dst[0] == 0x01 && dst[1] == 0x80 &&
2091                     dst[2] == 0xc2 && dst[3] == 0x00 &&
2092                     dst[4] == 0x00 && dst[5] <= 0x0f)
2093                         goto drop;
2094
2095                 /* ...forward it to all interfaces. */
2096                 ifp->if_imcasts++;
2097                 dst_if = NULL;
2098         }
2099
2100         /*
2101          * If we have a destination interface which is a member of our bridge,
2102          * OR this is a unicast packet, push it through the bpf(4) machinery.
2103          * For broadcast or multicast packets, don't bother because it will
2104          * be reinjected into ether_input. We do this before we pass the packets
2105          * through the pfil(9) framework, as it is possible that pfil(9) will
2106          * drop the packet, or possibly modify it, making it difficult to debug
2107          * firewall issues on the bridge.
2108          */
2109         if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2110                 ETHER_BPF_MTAP(ifp, m);
2111
2112         /* run the packet filter */
2113         if (PFIL_HOOKED(&V_inet_pfil_hook)
2114 #ifdef INET6
2115             || PFIL_HOOKED(&V_inet6_pfil_hook)
2116 #endif
2117             ) {
2118                 BRIDGE_UNLOCK(sc);
2119                 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2120                         return;
2121                 if (m == NULL)
2122                         return;
2123                 BRIDGE_LOCK(sc);
2124         }
2125
2126         if (dst_if == NULL) {
2127                 bridge_broadcast(sc, src_if, m, 1);
2128                 return;
2129         }
2130
2131         /*
2132          * At this point, we're dealing with a unicast frame
2133          * going to a different interface.
2134          */
2135         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2136                 goto drop;
2137
2138         dbif = bridge_lookup_member_if(sc, dst_if);
2139         if (dbif == NULL)
2140                 /* Not a member of the bridge (anymore?) */
2141                 goto drop;
2142
2143         /* Private segments can not talk to each other */
2144         if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2145                 goto drop;
2146
2147         if ((dbif->bif_flags & IFBIF_STP) &&
2148             dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2149                 goto drop;
2150
2151         BRIDGE_UNLOCK(sc);
2152
2153         if (PFIL_HOOKED(&V_inet_pfil_hook)
2154 #ifdef INET6
2155             || PFIL_HOOKED(&V_inet6_pfil_hook)
2156 #endif
2157             ) {
2158                 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2159                         return;
2160                 if (m == NULL)
2161                         return;
2162         }
2163
2164         bridge_enqueue(sc, dst_if, m);
2165         return;
2166
2167 drop:
2168         BRIDGE_UNLOCK(sc);
2169         m_freem(m);
2170 }
2171
2172 /*
2173  * bridge_input:
2174  *
2175  *      Receive input from a member interface.  Queue the packet for
2176  *      bridging if it is not for us.
2177  */
2178 static struct mbuf *
2179 bridge_input(struct ifnet *ifp, struct mbuf *m)
2180 {
2181         struct bridge_softc *sc = ifp->if_bridge;
2182         struct bridge_iflist *bif, *bif2;
2183         struct ifnet *bifp;
2184         struct ether_header *eh;
2185         struct mbuf *mc, *mc2;
2186         uint16_t vlan;
2187         int error;
2188
2189         if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2190                 return (m);
2191
2192         bifp = sc->sc_ifp;
2193         vlan = VLANTAGOF(m);
2194
2195         /*
2196          * Implement support for bridge monitoring. If this flag has been
2197          * set on this interface, discard the packet once we push it through
2198          * the bpf(4) machinery, but before we do, increment the byte and
2199          * packet counters associated with this interface.
2200          */
2201         if ((bifp->if_flags & IFF_MONITOR) != 0) {
2202                 m->m_pkthdr.rcvif  = bifp;
2203                 ETHER_BPF_MTAP(bifp, m);
2204                 bifp->if_ipackets++;
2205                 bifp->if_ibytes += m->m_pkthdr.len;
2206                 m_freem(m);
2207                 return (NULL);
2208         }
2209         BRIDGE_LOCK(sc);
2210         bif = bridge_lookup_member_if(sc, ifp);
2211         if (bif == NULL) {
2212                 BRIDGE_UNLOCK(sc);
2213                 return (m);
2214         }
2215
2216         eh = mtod(m, struct ether_header *);
2217
2218         bridge_span(sc, m);
2219
2220         if (m->m_flags & (M_BCAST|M_MCAST)) {
2221                 /* Tap off 802.1D packets; they do not get forwarded. */
2222                 if (memcmp(eh->ether_dhost, bstp_etheraddr,
2223                     ETHER_ADDR_LEN) == 0) {
2224                         bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
2225                         BRIDGE_UNLOCK(sc);
2226                         return (NULL);
2227                 }
2228
2229                 if ((bif->bif_flags & IFBIF_STP) &&
2230                     bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2231                         BRIDGE_UNLOCK(sc);
2232                         return (m);
2233                 }
2234
2235                 /*
2236                  * Make a deep copy of the packet and enqueue the copy
2237                  * for bridge processing; return the original packet for
2238                  * local processing.
2239                  */
2240                 mc = m_dup(m, M_DONTWAIT);
2241                 if (mc == NULL) {
2242                         BRIDGE_UNLOCK(sc);
2243                         return (m);
2244                 }
2245
2246                 /* Perform the bridge forwarding function with the copy. */
2247                 bridge_forward(sc, bif, mc);
2248
2249                 /*
2250                  * Reinject the mbuf as arriving on the bridge so we have a
2251                  * chance at claiming multicast packets. We can not loop back
2252                  * here from ether_input as a bridge is never a member of a
2253                  * bridge.
2254                  */
2255                 KASSERT(bifp->if_bridge == NULL,
2256                     ("loop created in bridge_input"));
2257                 mc2 = m_dup(m, M_DONTWAIT);
2258                 if (mc2 != NULL) {
2259                         /* Keep the layer3 header aligned */
2260                         int i = min(mc2->m_pkthdr.len, max_protohdr);
2261                         mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2262                 }
2263                 if (mc2 != NULL) {
2264                         mc2->m_pkthdr.rcvif = bifp;
2265                         (*bifp->if_input)(bifp, mc2);
2266                 }
2267
2268                 /* Return the original packet for local processing. */
2269                 return (m);
2270         }
2271
2272         if ((bif->bif_flags & IFBIF_STP) &&
2273             bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2274                 BRIDGE_UNLOCK(sc);
2275                 return (m);
2276         }
2277
2278 #if (defined(INET) || defined(INET6))
2279 #   define OR_CARP_CHECK_WE_ARE_DST(iface) \
2280         || ((iface)->if_carp \
2281             && (*carp_forus_p)((iface), eh->ether_dhost))
2282 #   define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2283         || ((iface)->if_carp \
2284             && (*carp_forus_p)((iface), eh->ether_shost))
2285 #else
2286 #   define OR_CARP_CHECK_WE_ARE_DST(iface)
2287 #   define OR_CARP_CHECK_WE_ARE_SRC(iface)
2288 #endif
2289
2290 #ifdef INET6
2291 #   define OR_PFIL_HOOKED_INET6 \
2292         || PFIL_HOOKED(&V_inet6_pfil_hook)
2293 #else
2294 #   define OR_PFIL_HOOKED_INET6
2295 #endif
2296
2297 #define GRAB_OUR_PACKETS(iface) \
2298         if ((iface)->if_type == IFT_GIF) \
2299                 continue; \
2300         /* It is destined for us. */ \
2301         if (memcmp(IF_LLADDR((iface)), eh->ether_dhost,  ETHER_ADDR_LEN) == 0 \
2302             OR_CARP_CHECK_WE_ARE_DST((iface))                           \
2303             ) {                                                         \
2304                 if ((iface)->if_type == IFT_BRIDGE) {                   \
2305                         ETHER_BPF_MTAP(iface, m);                       \
2306                         iface->if_ipackets++;                           \
2307                         /* Filter on the physical interface. */         \
2308                         if (pfil_local_phys &&                          \
2309                             (PFIL_HOOKED(&V_inet_pfil_hook)             \
2310                              OR_PFIL_HOOKED_INET6)) {                   \
2311                                 if (bridge_pfil(&m, NULL, ifp,          \
2312                                     PFIL_IN) != 0 || m == NULL) {       \
2313                                         BRIDGE_UNLOCK(sc);              \
2314                                         return (NULL);                  \
2315                                 }                                       \
2316                         }                                               \
2317                 }                                                       \
2318                 if (bif->bif_flags & IFBIF_LEARNING) {                  \
2319                         error = bridge_rtupdate(sc, eh->ether_shost,    \
2320                             vlan, bif, 0, IFBAF_DYNAMIC);               \
2321                         if (error && bif->bif_addrmax) {                \
2322                                 BRIDGE_UNLOCK(sc);                      \
2323                                 m_freem(m);                             \
2324                                 return (NULL);                          \
2325                         }                                               \
2326                 }                                                       \
2327                 m->m_pkthdr.rcvif = iface;                              \
2328                 BRIDGE_UNLOCK(sc);                                      \
2329                 return (m);                                             \
2330         }                                                               \
2331                                                                         \
2332         /* We just received a packet that we sent out. */               \
2333         if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2334             OR_CARP_CHECK_WE_ARE_SRC((iface))                   \
2335             ) {                                                         \
2336                 BRIDGE_UNLOCK(sc);                                      \
2337                 m_freem(m);                                             \
2338                 return (NULL);                                          \
2339         }
2340
2341         /*
2342          * Unicast.  Make sure it's not for the bridge.
2343          */
2344         do { GRAB_OUR_PACKETS(bifp) } while (0);
2345
2346         /*
2347          * Give a chance for ifp at first priority. This will help when the
2348          * packet comes through the interface like VLAN's with the same MACs
2349          * on several interfaces from the same bridge. This also will save
2350          * some CPU cycles in case the destination interface and the input
2351          * interface (eq ifp) are the same.
2352          */
2353         do { GRAB_OUR_PACKETS(ifp) } while (0);
2354
2355         /* Now check the all bridge members. */
2356         LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2357                 GRAB_OUR_PACKETS(bif2->bif_ifp)
2358         }
2359
2360 #undef OR_CARP_CHECK_WE_ARE_DST
2361 #undef OR_CARP_CHECK_WE_ARE_SRC
2362 #undef OR_PFIL_HOOKED_INET6
2363 #undef GRAB_OUR_PACKETS
2364
2365         /* Perform the bridge forwarding function. */
2366         bridge_forward(sc, bif, m);
2367
2368         return (NULL);
2369 }
2370
2371 /*
2372  * bridge_broadcast:
2373  *
2374  *      Send a frame to all interfaces that are members of
2375  *      the bridge, except for the one on which the packet
2376  *      arrived.
2377  *
2378  *      NOTE: Releases the lock on return.
2379  */
2380 static void
2381 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2382     struct mbuf *m, int runfilt)
2383 {
2384         struct bridge_iflist *dbif, *sbif;
2385         struct mbuf *mc;
2386         struct ifnet *dst_if;
2387         int error = 0, used = 0, i;
2388
2389         sbif = bridge_lookup_member_if(sc, src_if);
2390
2391         BRIDGE_LOCK2REF(sc, error);
2392         if (error) {
2393                 m_freem(m);
2394                 return;
2395         }
2396
2397         /* Filter on the bridge interface before broadcasting */
2398         if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2399 #ifdef INET6
2400             || PFIL_HOOKED(&V_inet6_pfil_hook)
2401 #endif
2402             )) {
2403                 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2404                         goto out;
2405                 if (m == NULL)
2406                         goto out;
2407         }
2408
2409         LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2410                 dst_if = dbif->bif_ifp;
2411                 if (dst_if == src_if)
2412                         continue;
2413
2414                 /* Private segments can not talk to each other */
2415                 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2416                         continue;
2417
2418                 if ((dbif->bif_flags & IFBIF_STP) &&
2419                     dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2420                         continue;
2421
2422                 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2423                     (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2424                         continue;
2425
2426                 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2427                         continue;
2428
2429                 if (LIST_NEXT(dbif, bif_next) == NULL) {
2430                         mc = m;
2431                         used = 1;
2432                 } else {
2433                         mc = m_dup(m, M_DONTWAIT);
2434                         if (mc == NULL) {
2435                                 sc->sc_ifp->if_oerrors++;
2436                                 continue;
2437                         }
2438                 }
2439
2440                 /*
2441                  * Filter on the output interface. Pass a NULL bridge interface
2442                  * pointer so we do not redundantly filter on the bridge for
2443                  * each interface we broadcast on.
2444                  */
2445                 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2446 #ifdef INET6
2447                     || PFIL_HOOKED(&V_inet6_pfil_hook)
2448 #endif
2449                     )) {
2450                         if (used == 0) {
2451                                 /* Keep the layer3 header aligned */
2452                                 i = min(mc->m_pkthdr.len, max_protohdr);
2453                                 mc = m_copyup(mc, i, ETHER_ALIGN);
2454                                 if (mc == NULL) {
2455                                         sc->sc_ifp->if_oerrors++;
2456                                         continue;
2457                                 }
2458                         }
2459                         if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2460                                 continue;
2461                         if (mc == NULL)
2462                                 continue;
2463                 }
2464
2465                 bridge_enqueue(sc, dst_if, mc);
2466         }
2467         if (used == 0)
2468                 m_freem(m);
2469
2470 out:
2471         BRIDGE_UNREF(sc);
2472 }
2473
2474 /*
2475  * bridge_span:
2476  *
2477  *      Duplicate a packet out one or more interfaces that are in span mode,
2478  *      the original mbuf is unmodified.
2479  */
2480 static void
2481 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2482 {
2483         struct bridge_iflist *bif;
2484         struct ifnet *dst_if;
2485         struct mbuf *mc;
2486
2487         if (LIST_EMPTY(&sc->sc_spanlist))
2488                 return;
2489
2490         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2491                 dst_if = bif->bif_ifp;
2492
2493                 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2494                         continue;
2495
2496                 mc = m_copypacket(m, M_DONTWAIT);
2497                 if (mc == NULL) {
2498                         sc->sc_ifp->if_oerrors++;
2499                         continue;
2500                 }
2501
2502                 bridge_enqueue(sc, dst_if, mc);
2503         }
2504 }
2505
2506 /*
2507  * bridge_rtupdate:
2508  *
2509  *      Add a bridge routing entry.
2510  */
2511 static int
2512 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2513     struct bridge_iflist *bif, int setflags, uint8_t flags)
2514 {
2515         struct bridge_rtnode *brt;
2516         int error;
2517
2518         BRIDGE_LOCK_ASSERT(sc);
2519
2520         /* Check the source address is valid and not multicast. */
2521         if (ETHER_IS_MULTICAST(dst) ||
2522             (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2523              dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2524                 return (EINVAL);
2525
2526         /* 802.1p frames map to vlan 1 */
2527         if (vlan == 0)
2528                 vlan = 1;
2529
2530         /*
2531          * A route for this destination might already exist.  If so,
2532          * update it, otherwise create a new one.
2533          */
2534         if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2535                 if (sc->sc_brtcnt >= sc->sc_brtmax) {
2536                         sc->sc_brtexceeded++;
2537                         return (ENOSPC);
2538                 }
2539                 /* Check per interface address limits (if enabled) */
2540                 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2541                         bif->bif_addrexceeded++;
2542                         return (ENOSPC);
2543                 }
2544
2545                 /*
2546                  * Allocate a new bridge forwarding node, and
2547                  * initialize the expiration time and Ethernet
2548                  * address.
2549                  */
2550                 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2551                 if (brt == NULL)
2552                         return (ENOMEM);
2553
2554                 if (bif->bif_flags & IFBIF_STICKY)
2555                         brt->brt_flags = IFBAF_STICKY;
2556                 else
2557                         brt->brt_flags = IFBAF_DYNAMIC;
2558
2559                 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2560                 brt->brt_vlan = vlan;
2561
2562                 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2563                         uma_zfree(bridge_rtnode_zone, brt);
2564                         return (error);
2565                 }
2566                 brt->brt_dst = bif;
2567                 bif->bif_addrcnt++;
2568         }
2569
2570         if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2571             brt->brt_dst != bif) {
2572                 brt->brt_dst->bif_addrcnt--;
2573                 brt->brt_dst = bif;
2574                 brt->brt_dst->bif_addrcnt++;
2575         }
2576
2577         if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2578                 brt->brt_expire = time_uptime + sc->sc_brttimeout;
2579         if (setflags)
2580                 brt->brt_flags = flags;
2581
2582         return (0);
2583 }
2584
2585 /*
2586  * bridge_rtlookup:
2587  *
2588  *      Lookup the destination interface for an address.
2589  */
2590 static struct ifnet *
2591 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2592 {
2593         struct bridge_rtnode *brt;
2594
2595         BRIDGE_LOCK_ASSERT(sc);
2596
2597         if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2598                 return (NULL);
2599
2600         return (brt->brt_ifp);
2601 }
2602
2603 /*
2604  * bridge_rttrim:
2605  *
2606  *      Trim the routine table so that we have a number
2607  *      of routing entries less than or equal to the
2608  *      maximum number.
2609  */
2610 static void
2611 bridge_rttrim(struct bridge_softc *sc)
2612 {
2613         struct bridge_rtnode *brt, *nbrt;
2614
2615         BRIDGE_LOCK_ASSERT(sc);
2616
2617         /* Make sure we actually need to do this. */
2618         if (sc->sc_brtcnt <= sc->sc_brtmax)
2619                 return;
2620
2621         /* Force an aging cycle; this might trim enough addresses. */
2622         bridge_rtage(sc);
2623         if (sc->sc_brtcnt <= sc->sc_brtmax)
2624                 return;
2625
2626         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2627                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2628                         bridge_rtnode_destroy(sc, brt);
2629                         if (sc->sc_brtcnt <= sc->sc_brtmax)
2630                                 return;
2631                 }
2632         }
2633 }
2634
2635 /*
2636  * bridge_timer:
2637  *
2638  *      Aging timer for the bridge.
2639  */
2640 static void
2641 bridge_timer(void *arg)
2642 {
2643         struct bridge_softc *sc = arg;
2644
2645         BRIDGE_LOCK_ASSERT(sc);
2646
2647         bridge_rtage(sc);
2648
2649         if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2650                 callout_reset(&sc->sc_brcallout,
2651                     bridge_rtable_prune_period * hz, bridge_timer, sc);
2652 }
2653
2654 /*
2655  * bridge_rtage:
2656  *
2657  *      Perform an aging cycle.
2658  */
2659 static void
2660 bridge_rtage(struct bridge_softc *sc)
2661 {
2662         struct bridge_rtnode *brt, *nbrt;
2663
2664         BRIDGE_LOCK_ASSERT(sc);
2665
2666         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2667                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2668                         if (time_uptime >= brt->brt_expire)
2669                                 bridge_rtnode_destroy(sc, brt);
2670                 }
2671         }
2672 }
2673
2674 /*
2675  * bridge_rtflush:
2676  *
2677  *      Remove all dynamic addresses from the bridge.
2678  */
2679 static void
2680 bridge_rtflush(struct bridge_softc *sc, int full)
2681 {
2682         struct bridge_rtnode *brt, *nbrt;
2683
2684         BRIDGE_LOCK_ASSERT(sc);
2685
2686         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2687                 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2688                         bridge_rtnode_destroy(sc, brt);
2689         }
2690 }
2691
2692 /*
2693  * bridge_rtdaddr:
2694  *
2695  *      Remove an address from the table.
2696  */
2697 static int
2698 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2699 {
2700         struct bridge_rtnode *brt;
2701         int found = 0;
2702
2703         BRIDGE_LOCK_ASSERT(sc);
2704
2705         /*
2706          * If vlan is zero then we want to delete for all vlans so the lookup
2707          * may return more than one.
2708          */
2709         while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
2710                 bridge_rtnode_destroy(sc, brt);
2711                 found = 1;
2712         }
2713
2714         return (found ? 0 : ENOENT);
2715 }
2716
2717 /*
2718  * bridge_rtdelete:
2719  *
2720  *      Delete routes to a speicifc member interface.
2721  */
2722 static void
2723 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2724 {
2725         struct bridge_rtnode *brt, *nbrt;
2726
2727         BRIDGE_LOCK_ASSERT(sc);
2728
2729         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2730                 if (brt->brt_ifp == ifp && (full ||
2731                             (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2732                         bridge_rtnode_destroy(sc, brt);
2733         }
2734 }
2735
2736 /*
2737  * bridge_rtable_init:
2738  *
2739  *      Initialize the route table for this bridge.
2740  */
2741 static int
2742 bridge_rtable_init(struct bridge_softc *sc)
2743 {
2744         int i;
2745
2746         sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
2747             M_DEVBUF, M_NOWAIT);
2748         if (sc->sc_rthash == NULL)
2749                 return (ENOMEM);
2750
2751         for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
2752                 LIST_INIT(&sc->sc_rthash[i]);
2753
2754         sc->sc_rthash_key = arc4random();
2755
2756         LIST_INIT(&sc->sc_rtlist);
2757
2758         return (0);
2759 }
2760
2761 /*
2762  * bridge_rtable_fini:
2763  *
2764  *      Deconstruct the route table for this bridge.
2765  */
2766 static void
2767 bridge_rtable_fini(struct bridge_softc *sc)
2768 {
2769
2770         KASSERT(sc->sc_brtcnt == 0,
2771             ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
2772         free(sc->sc_rthash, M_DEVBUF);
2773 }
2774
2775 /*
2776  * The following hash function is adapted from "Hash Functions" by Bob Jenkins
2777  * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
2778  */
2779 #define mix(a, b, c)                                                    \
2780 do {                                                                    \
2781         a -= b; a -= c; a ^= (c >> 13);                                 \
2782         b -= c; b -= a; b ^= (a << 8);                                  \
2783         c -= a; c -= b; c ^= (b >> 13);                                 \
2784         a -= b; a -= c; a ^= (c >> 12);                                 \
2785         b -= c; b -= a; b ^= (a << 16);                                 \
2786         c -= a; c -= b; c ^= (b >> 5);                                  \
2787         a -= b; a -= c; a ^= (c >> 3);                                  \
2788         b -= c; b -= a; b ^= (a << 10);                                 \
2789         c -= a; c -= b; c ^= (b >> 15);                                 \
2790 } while (/*CONSTCOND*/0)
2791
2792 static __inline uint32_t
2793 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
2794 {
2795         uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
2796
2797         b += addr[5] << 8;
2798         b += addr[4];
2799         a += addr[3] << 24;
2800         a += addr[2] << 16;
2801         a += addr[1] << 8;
2802         a += addr[0];
2803
2804         mix(a, b, c);
2805
2806         return (c & BRIDGE_RTHASH_MASK);
2807 }
2808
2809 #undef mix
2810
2811 static int
2812 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
2813 {
2814         int i, d;
2815
2816         for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
2817                 d = ((int)a[i]) - ((int)b[i]);
2818         }
2819
2820         return (d);
2821 }
2822
2823 /*
2824  * bridge_rtnode_lookup:
2825  *
2826  *      Look up a bridge route node for the specified destination. Compare the
2827  *      vlan id or if zero then just return the first match.
2828  */
2829 static struct bridge_rtnode *
2830 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2831 {
2832         struct bridge_rtnode *brt;
2833         uint32_t hash;
2834         int dir;
2835
2836         BRIDGE_LOCK_ASSERT(sc);
2837
2838         hash = bridge_rthash(sc, addr);
2839         LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
2840                 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
2841                 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
2842                         return (brt);
2843                 if (dir > 0)
2844                         return (NULL);
2845         }
2846
2847         return (NULL);
2848 }
2849
2850 /*
2851  * bridge_rtnode_insert:
2852  *
2853  *      Insert the specified bridge node into the route table.  We
2854  *      assume the entry is not already in the table.
2855  */
2856 static int
2857 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
2858 {
2859         struct bridge_rtnode *lbrt;
2860         uint32_t hash;
2861         int dir;
2862
2863         BRIDGE_LOCK_ASSERT(sc);
2864
2865         hash = bridge_rthash(sc, brt->brt_addr);
2866
2867         lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
2868         if (lbrt == NULL) {
2869                 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
2870                 goto out;
2871         }
2872
2873         do {
2874                 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
2875                 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
2876                         return (EEXIST);
2877                 if (dir > 0) {
2878                         LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
2879                         goto out;
2880                 }
2881                 if (LIST_NEXT(lbrt, brt_hash) == NULL) {
2882                         LIST_INSERT_AFTER(lbrt, brt, brt_hash);
2883                         goto out;
2884                 }
2885                 lbrt = LIST_NEXT(lbrt, brt_hash);
2886         } while (lbrt != NULL);
2887
2888 #ifdef DIAGNOSTIC
2889         panic("bridge_rtnode_insert: impossible");
2890 #endif
2891
2892 out:
2893         LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
2894         sc->sc_brtcnt++;
2895
2896         return (0);
2897 }
2898
2899 /*
2900  * bridge_rtnode_destroy:
2901  *
2902  *      Destroy a bridge rtnode.
2903  */
2904 static void
2905 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
2906 {
2907         BRIDGE_LOCK_ASSERT(sc);
2908
2909         LIST_REMOVE(brt, brt_hash);
2910
2911         LIST_REMOVE(brt, brt_list);
2912         sc->sc_brtcnt--;
2913         brt->brt_dst->bif_addrcnt--;
2914         uma_zfree(bridge_rtnode_zone, brt);
2915 }
2916
2917 /*
2918  * bridge_rtable_expire:
2919  *
2920  *      Set the expiry time for all routes on an interface.
2921  */
2922 static void
2923 bridge_rtable_expire(struct ifnet *ifp, int age)
2924 {
2925         struct bridge_softc *sc = ifp->if_bridge;
2926         struct bridge_rtnode *brt;
2927
2928         BRIDGE_LOCK(sc);
2929
2930         /*
2931          * If the age is zero then flush, otherwise set all the expiry times to
2932          * age for the interface
2933          */
2934         if (age == 0)
2935                 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
2936         else {
2937                 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
2938                         /* Cap the expiry time to 'age' */
2939                         if (brt->brt_ifp == ifp &&
2940                             brt->brt_expire > time_uptime + age &&
2941                             (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2942                                 brt->brt_expire = time_uptime + age;
2943                 }
2944         }
2945         BRIDGE_UNLOCK(sc);
2946 }
2947
2948 /*
2949  * bridge_state_change:
2950  *
2951  *      Callback from the bridgestp code when a port changes states.
2952  */
2953 static void
2954 bridge_state_change(struct ifnet *ifp, int state)
2955 {
2956         struct bridge_softc *sc = ifp->if_bridge;
2957         static const char *stpstates[] = {
2958                 "disabled",
2959                 "listening",
2960                 "learning",
2961                 "forwarding",
2962                 "blocking",
2963                 "discarding"
2964         };
2965
2966         if (log_stp)
2967                 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
2968                     sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
2969 }
2970
2971 /*
2972  * Send bridge packets through pfil if they are one of the types pfil can deal
2973  * with, or if they are ARP or REVARP.  (pfil will pass ARP and REVARP without
2974  * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
2975  * that interface.
2976  */
2977 static int
2978 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
2979 {
2980         int snap, error, i, hlen;
2981         struct ether_header *eh1, eh2;
2982         struct ip_fw_args args;
2983         struct ip *ip;
2984         struct llc llc1;
2985         u_int16_t ether_type;
2986
2987         snap = 0;
2988         error = -1;     /* Default error if not error == 0 */
2989
2990 #if 0
2991         /* we may return with the IP fields swapped, ensure its not shared */
2992         KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
2993 #endif
2994
2995         if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0)
2996                 return (0); /* filtering is disabled */
2997
2998         i = min((*mp)->m_pkthdr.len, max_protohdr);
2999         if ((*mp)->m_len < i) {
3000             *mp = m_pullup(*mp, i);
3001             if (*mp == NULL) {
3002                 printf("%s: m_pullup failed\n", __func__);
3003                 return (-1);
3004             }
3005         }
3006
3007         eh1 = mtod(*mp, struct ether_header *);
3008         ether_type = ntohs(eh1->ether_type);
3009
3010         /*
3011          * Check for SNAP/LLC.
3012          */
3013         if (ether_type < ETHERMTU) {
3014                 struct llc *llc2 = (struct llc *)(eh1 + 1);
3015
3016                 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3017                     llc2->llc_dsap == LLC_SNAP_LSAP &&
3018                     llc2->llc_ssap == LLC_SNAP_LSAP &&
3019                     llc2->llc_control == LLC_UI) {
3020                         ether_type = htons(llc2->llc_un.type_snap.ether_type);
3021                         snap = 1;
3022                 }
3023         }
3024
3025         /*
3026          * If we're trying to filter bridge traffic, don't look at anything
3027          * other than IP and ARP traffic.  If the filter doesn't understand
3028          * IPv6, don't allow IPv6 through the bridge either.  This is lame
3029          * since if we really wanted, say, an AppleTalk filter, we are hosed,
3030          * but of course we don't have an AppleTalk filter to begin with.
3031          * (Note that since pfil doesn't understand ARP it will pass *ALL*
3032          * ARP traffic.)
3033          */
3034         switch (ether_type) {
3035                 case ETHERTYPE_ARP:
3036                 case ETHERTYPE_REVARP:
3037                         if (pfil_ipfw_arp == 0)
3038                                 return (0); /* Automatically pass */
3039                         break;
3040
3041                 case ETHERTYPE_IP:
3042 #ifdef INET6
3043                 case ETHERTYPE_IPV6:
3044 #endif /* INET6 */
3045                         break;
3046                 default:
3047                         /*
3048                          * Check to see if the user wants to pass non-ip
3049                          * packets, these will not be checked by pfil(9) and
3050                          * passed unconditionally so the default is to drop.
3051                          */
3052                         if (pfil_onlyip)
3053                                 goto bad;
3054         }
3055
3056         /* Strip off the Ethernet header and keep a copy. */
3057         m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3058         m_adj(*mp, ETHER_HDR_LEN);
3059
3060         /* Strip off snap header, if present */
3061         if (snap) {
3062                 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3063                 m_adj(*mp, sizeof(struct llc));
3064         }
3065
3066         /*
3067          * Check the IP header for alignment and errors
3068          */
3069         if (dir == PFIL_IN) {
3070                 switch (ether_type) {
3071                         case ETHERTYPE_IP:
3072                                 error = bridge_ip_checkbasic(mp);
3073                                 break;
3074 #ifdef INET6
3075                         case ETHERTYPE_IPV6:
3076                                 error = bridge_ip6_checkbasic(mp);
3077                                 break;
3078 #endif /* INET6 */
3079                         default:
3080                                 error = 0;
3081                 }
3082                 if (error)
3083                         goto bad;
3084         }
3085
3086         /* XXX this section is also in if_ethersubr.c */
3087         // XXX PFIL_OUT or DIR_OUT ?
3088         if (V_ip_fw_chk_ptr && pfil_ipfw != 0 &&
3089                         dir == PFIL_OUT && ifp != NULL) {
3090                 struct m_tag *mtag;
3091
3092                 error = -1;
3093                 /* fetch the start point from existing tags, if any */
3094                 mtag = m_tag_locate(*mp, MTAG_IPFW_RULE, 0, NULL);
3095                 if (mtag == NULL) {
3096                         args.rule.slot = 0;
3097                 } else {
3098                         struct ipfw_rule_ref *r;
3099
3100                         /* XXX can we free the tag after use ? */
3101                         mtag->m_tag_id = PACKET_TAG_NONE;
3102                         r = (struct ipfw_rule_ref *)(mtag + 1);
3103                         /* packet already partially processed ? */
3104                         if (r->info & IPFW_ONEPASS)
3105                                 goto ipfwpass;
3106                         args.rule = *r;
3107                 }
3108
3109                 args.m = *mp;
3110                 args.oif = ifp;
3111                 args.next_hop = NULL;
3112                 args.next_hop6 = NULL;
3113                 args.eh = &eh2;
3114                 args.inp = NULL;        /* used by ipfw uid/gid/jail rules */
3115                 i = V_ip_fw_chk_ptr(&args);
3116                 *mp = args.m;
3117
3118                 if (*mp == NULL)
3119                         return (error);
3120
3121                 if (ip_dn_io_ptr && (i == IP_FW_DUMMYNET)) {
3122
3123                         /* put the Ethernet header back on */
3124                         M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT);
3125                         if (*mp == NULL)
3126                                 return (error);
3127                         bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3128
3129                         /*
3130                          * Pass the pkt to dummynet, which consumes it. The
3131                          * packet will return to us via bridge_dummynet().
3132                          */
3133                         args.oif = ifp;
3134                         ip_dn_io_ptr(mp, DIR_FWD | PROTO_IFB, &args);
3135                         return (error);
3136                 }
3137
3138                 if (i != IP_FW_PASS) /* drop */
3139                         goto bad;
3140         }
3141
3142 ipfwpass:
3143         error = 0;
3144
3145         /*
3146          * Run the packet through pfil
3147          */
3148         switch (ether_type) {
3149         case ETHERTYPE_IP:
3150                 /*
3151                  * before calling the firewall, swap fields the same as
3152                  * IP does. here we assume the header is contiguous
3153                  */
3154                 ip = mtod(*mp, struct ip *);
3155
3156                 ip->ip_len = ntohs(ip->ip_len);
3157                 ip->ip_off = ntohs(ip->ip_off);
3158
3159                 /*
3160                  * Run pfil on the member interface and the bridge, both can
3161                  * be skipped by clearing pfil_member or pfil_bridge.
3162                  *
3163                  * Keep the order:
3164                  *   in_if -> bridge_if -> out_if
3165                  */
3166                 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3167                         error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3168                                         dir, NULL);
3169
3170                 if (*mp == NULL || error != 0) /* filter may consume */
3171                         break;
3172
3173                 if (pfil_member && ifp != NULL)
3174                         error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp,
3175                                         dir, NULL);
3176
3177                 if (*mp == NULL || error != 0) /* filter may consume */
3178                         break;
3179
3180                 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
3181                         error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3182                                         dir, NULL);
3183
3184                 if (*mp == NULL || error != 0) /* filter may consume */
3185                         break;
3186
3187                 /* check if we need to fragment the packet */
3188                 if (pfil_member && ifp != NULL && dir == PFIL_OUT) {
3189                         i = (*mp)->m_pkthdr.len;
3190                         if (i > ifp->if_mtu) {
3191                                 error = bridge_fragment(ifp, *mp, &eh2, snap,
3192                                             &llc1);
3193                                 return (error);
3194                         }
3195                 }
3196
3197                 /* Recalculate the ip checksum and restore byte ordering */
3198                 ip = mtod(*mp, struct ip *);
3199                 hlen = ip->ip_hl << 2;
3200                 if (hlen < sizeof(struct ip))
3201                         goto bad;
3202                 if (hlen > (*mp)->m_len) {
3203                         if ((*mp = m_pullup(*mp, hlen)) == 0)
3204                                 goto bad;
3205                         ip = mtod(*mp, struct ip *);
3206                         if (ip == NULL)
3207                                 goto bad;
3208                 }
3209                 ip->ip_len = htons(ip->ip_len);
3210                 ip->ip_off = htons(ip->ip_off);
3211                 ip->ip_sum = 0;
3212                 if (hlen == sizeof(struct ip))
3213                         ip->ip_sum = in_cksum_hdr(ip);
3214                 else
3215                         ip->ip_sum = in_cksum(*mp, hlen);
3216
3217                 break;
3218 #ifdef INET6
3219         case ETHERTYPE_IPV6:
3220                 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3221                         error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3222                                         dir, NULL);
3223
3224                 if (*mp == NULL || error != 0) /* filter may consume */
3225                         break;
3226
3227                 if (pfil_member && ifp != NULL)
3228                         error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp,
3229                                         dir, NULL);
3230
3231                 if (*mp == NULL || error != 0) /* filter may consume */
3232                         break;
3233
3234                 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
3235                         error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3236                                         dir, NULL);
3237                 break;
3238 #endif
3239         default:
3240                 error = 0;
3241                 break;
3242         }
3243
3244         if (*mp == NULL)
3245                 return (error);
3246         if (error != 0)
3247                 goto bad;
3248
3249         error = -1;
3250
3251         /*
3252          * Finally, put everything back the way it was and return
3253          */
3254         if (snap) {
3255                 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT);
3256                 if (*mp == NULL)
3257                         return (error);
3258                 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3259         }
3260
3261         M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT);
3262         if (*mp == NULL)
3263                 return (error);
3264         bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3265
3266         return (0);
3267
3268 bad:
3269         m_freem(*mp);
3270         *mp = NULL;
3271         return (error);
3272 }
3273
3274 /*
3275  * Perform basic checks on header size since
3276  * pfil assumes ip_input has already processed
3277  * it for it.  Cut-and-pasted from ip_input.c.
3278  * Given how simple the IPv6 version is,
3279  * does the IPv4 version really need to be
3280  * this complicated?
3281  *
3282  * XXX Should we update ipstat here, or not?
3283  * XXX Right now we update ipstat but not
3284  * XXX csum_counter.
3285  */
3286 static int
3287 bridge_ip_checkbasic(struct mbuf **mp)
3288 {
3289         struct mbuf *m = *mp;
3290         struct ip *ip;
3291         int len, hlen;
3292         u_short sum;
3293
3294         if (*mp == NULL)
3295                 return (-1);
3296
3297         if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3298                 if ((m = m_copyup(m, sizeof(struct ip),
3299                         (max_linkhdr + 3) & ~3)) == NULL) {
3300                         /* XXXJRT new stat, please */
3301                         KMOD_IPSTAT_INC(ips_toosmall);
3302                         goto bad;
3303                 }
3304         } else if (__predict_false(m->m_len < sizeof (struct ip))) {
3305                 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3306                         KMOD_IPSTAT_INC(ips_toosmall);
3307                         goto bad;
3308                 }
3309         }
3310         ip = mtod(m, struct ip *);
3311         if (ip == NULL) goto bad;
3312
3313         if (ip->ip_v != IPVERSION) {
3314                 KMOD_IPSTAT_INC(ips_badvers);
3315                 goto bad;
3316         }
3317         hlen = ip->ip_hl << 2;
3318         if (hlen < sizeof(struct ip)) { /* minimum header length */
3319                 KMOD_IPSTAT_INC(ips_badhlen);
3320                 goto bad;
3321         }
3322         if (hlen > m->m_len) {
3323                 if ((m = m_pullup(m, hlen)) == 0) {
3324                         KMOD_IPSTAT_INC(ips_badhlen);
3325                         goto bad;
3326                 }
3327                 ip = mtod(m, struct ip *);
3328                 if (ip == NULL) goto bad;
3329         }
3330
3331         if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3332                 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3333         } else {
3334                 if (hlen == sizeof(struct ip)) {
3335                         sum = in_cksum_hdr(ip);
3336                 } else {
3337                         sum = in_cksum(m, hlen);
3338                 }
3339         }
3340         if (sum) {
3341                 KMOD_IPSTAT_INC(ips_badsum);
3342                 goto bad;
3343         }
3344
3345         /* Retrieve the packet length. */
3346         len = ntohs(ip->ip_len);
3347
3348         /*
3349          * Check for additional length bogosity
3350          */
3351         if (len < hlen) {
3352                 KMOD_IPSTAT_INC(ips_badlen);
3353                 goto bad;
3354         }
3355
3356         /*
3357          * Check that the amount of data in the buffers
3358          * is as at least much as the IP header would have us expect.
3359          * Drop packet if shorter than we expect.
3360          */
3361         if (m->m_pkthdr.len < len) {
3362                 KMOD_IPSTAT_INC(ips_tooshort);
3363                 goto bad;
3364         }
3365
3366         /* Checks out, proceed */
3367         *mp = m;
3368         return (0);
3369
3370 bad:
3371         *mp = m;
3372         return (-1);
3373 }
3374
3375 #ifdef INET6
3376 /*
3377  * Same as above, but for IPv6.
3378  * Cut-and-pasted from ip6_input.c.
3379  * XXX Should we update ip6stat, or not?
3380  */
3381 static int
3382 bridge_ip6_checkbasic(struct mbuf **mp)
3383 {
3384         struct mbuf *m = *mp;
3385         struct ip6_hdr *ip6;
3386
3387         /*
3388          * If the IPv6 header is not aligned, slurp it up into a new
3389          * mbuf with space for link headers, in the event we forward
3390          * it.  Otherwise, if it is aligned, make sure the entire base
3391          * IPv6 header is in the first mbuf of the chain.
3392          */
3393         if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3394                 struct ifnet *inifp = m->m_pkthdr.rcvif;
3395                 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3396                             (max_linkhdr + 3) & ~3)) == NULL) {
3397                         /* XXXJRT new stat, please */
3398                         V_ip6stat.ip6s_toosmall++;
3399                         in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3400                         goto bad;
3401                 }
3402         } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3403                 struct ifnet *inifp = m->m_pkthdr.rcvif;
3404                 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3405                         V_ip6stat.ip6s_toosmall++;
3406                         in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3407                         goto bad;
3408                 }
3409         }
3410
3411         ip6 = mtod(m, struct ip6_hdr *);
3412
3413         if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3414                 V_ip6stat.ip6s_badvers++;
3415                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3416                 goto bad;
3417         }
3418
3419         /* Checks out, proceed */
3420         *mp = m;
3421         return (0);
3422
3423 bad:
3424         *mp = m;
3425         return (-1);
3426 }
3427 #endif /* INET6 */
3428
3429 /*
3430  * bridge_fragment:
3431  *
3432  *      Return a fragmented mbuf chain.
3433  */
3434 static int
3435 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh,
3436     int snap, struct llc *llc)
3437 {
3438         struct mbuf *m0;
3439         struct ip *ip;
3440         int error = -1;
3441
3442         if (m->m_len < sizeof(struct ip) &&
3443             (m = m_pullup(m, sizeof(struct ip))) == NULL)
3444                 goto out;
3445         ip = mtod(m, struct ip *);
3446
3447         error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist,
3448                     CSUM_DELAY_IP);
3449         if (error)
3450                 goto out;
3451
3452         /* walk the chain and re-add the Ethernet header */
3453         for (m0 = m; m0; m0 = m0->m_nextpkt) {
3454                 if (error == 0) {
3455                         if (snap) {
3456                                 M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT);
3457                                 if (m0 == NULL) {
3458                                         error = ENOBUFS;
3459                                         continue;
3460                                 }
3461                                 bcopy(llc, mtod(m0, caddr_t),
3462                                     sizeof(struct llc));
3463                         }
3464                         M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT);
3465                         if (m0 == NULL) {
3466                                 error = ENOBUFS;
3467                                 continue;
3468                         }
3469                         bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN);
3470                 } else
3471                         m_freem(m);
3472         }
3473
3474         if (error == 0)
3475                 KMOD_IPSTAT_INC(ips_fragmented);
3476
3477         return (error);
3478
3479 out:
3480         if (m != NULL)
3481                 m_freem(m);
3482         return (error);
3483 }
3484
3485 static void
3486 bridge_linkstate(struct ifnet *ifp)
3487 {
3488         struct bridge_softc *sc = ifp->if_bridge;
3489         struct bridge_iflist *bif;
3490
3491         BRIDGE_LOCK(sc);
3492         bif = bridge_lookup_member_if(sc, ifp);
3493         if (bif == NULL) {
3494                 BRIDGE_UNLOCK(sc);
3495                 return;
3496         }
3497         bridge_linkcheck(sc);
3498         BRIDGE_UNLOCK(sc);
3499
3500         bstp_linkstate(&bif->bif_stp);
3501 }
3502
3503 static void
3504 bridge_linkcheck(struct bridge_softc *sc)
3505 {
3506         struct bridge_iflist *bif;
3507         int new_link, hasls;
3508
3509         BRIDGE_LOCK_ASSERT(sc);
3510         new_link = LINK_STATE_DOWN;
3511         hasls = 0;
3512         /* Our link is considered up if at least one of our ports is active */
3513         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
3514                 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
3515                         hasls++;
3516                 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
3517                         new_link = LINK_STATE_UP;
3518                         break;
3519                 }
3520         }
3521         if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) {
3522                 /* If no interfaces support link-state then we default to up */
3523                 new_link = LINK_STATE_UP;
3524         }
3525         if_link_state_change(sc->sc_ifp, new_link);
3526 }