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 #include "opt_carp.h"
  83
  84 #include <sys/param.h>
  85 #include <sys/mbuf.h>
  86 #include <sys/malloc.h>
  87 #include <sys/protosw.h>
  88 #include <sys/systm.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/vimage.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
 113 #include <netinet/in.h> /* for struct arpcom */
 114 #include <netinet/in_systm.h>
 115 #include <netinet/in_var.h>
 116 #include <netinet/ip.h>
 117 #include <netinet/ip_var.h>
 118 #ifdef INET6
 119 #include <netinet/ip6.h>
 120 #include <netinet6/ip6_var.h>
 121 #endif
 122 #ifdef DEV_CARP
 123 #include <netinet/ip_carp.h>
 124 #endif
 125 #include <machine/in_cksum.h>
 126 #include <netinet/if_ether.h> /* for struct arpcom */
 127 #include <net/bridgestp.h>
 128 #include <net/if_bridgevar.h>
 129 #include <net/if_llc.h>
 130 #include <net/if_vlan_var.h>
 131
 132 #include <net/route.h>
 133 #include <netinet/ip_fw.h>
 134 #include <netinet/ip_dummynet.h>
 135
 136 /*
 137  * Size of the route hash table.  Must be a power of two.
 138  */
 139 #ifndef BRIDGE_RTHASH_SIZE
 140 #define BRIDGE_RTHASH_SIZE              1024
 141 #endif
 142
 143 #define BRIDGE_RTHASH_MASK              (BRIDGE_RTHASH_SIZE - 1)
 144
 145 /*
 146  * Maximum number of addresses to cache.
 147  */
 148 #ifndef BRIDGE_RTABLE_MAX
 149 #define BRIDGE_RTABLE_MAX               100
 150 #endif
 151
 152 /*
 153  * Timeout (in seconds) for entries learned dynamically.
 154  */
 155 #ifndef BRIDGE_RTABLE_TIMEOUT
 156 #define BRIDGE_RTABLE_TIMEOUT           (20 * 60)       /* same as ARP */
 157 #endif
 158
 159 /*
 160  * Number of seconds between walks of the route list.
 161  */
 162 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
 163 #define BRIDGE_RTABLE_PRUNE_PERIOD      (5 * 60)
 164 #endif
 165
 166 /*
 167  * List of capabilities to possibly mask on the member interface.
 168  */
 169 #define BRIDGE_IFCAPS_MASK              (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM)
 170
 171 /*
 172  * Bridge interface list entry.
 173  */
 174 struct bridge_iflist {
 175         LIST_ENTRY(bridge_iflist) bif_next;
 176         struct ifnet            *bif_ifp;       /* member if */
 177         struct bstp_port        bif_stp;        /* STP state */
 178         uint32_t                bif_flags;      /* member if flags */
 179         int                     bif_savedcaps;  /* saved capabilities */
 180         uint32_t                bif_addrmax;    /* max # of addresses */
 181         uint32_t                bif_addrcnt;    /* cur. # of addresses */
 182         uint32_t                bif_addrexceeded;/* # of address violations */
 183 };
 184
 185 /*
 186  * Bridge route node.
 187  */
 188 struct bridge_rtnode {
 189         LIST_ENTRY(bridge_rtnode) brt_hash;     /* hash table linkage */
 190         LIST_ENTRY(bridge_rtnode) brt_list;     /* list linkage */
 191         struct bridge_iflist    *brt_dst;       /* destination if */
 192         unsigned long           brt_expire;     /* expiration time */
 193         uint8_t                 brt_flags;      /* address flags */
 194         uint8_t                 brt_addr[ETHER_ADDR_LEN];
 195         uint16_t                brt_vlan;       /* vlan id */
 196 };
 197 #define brt_ifp                 brt_dst->bif_ifp
 198
 199 /*
 200  * Software state for each bridge.
 201  */
 202 struct bridge_softc {
 203         struct ifnet            *sc_ifp;        /* make this an interface */
 204         LIST_ENTRY(bridge_softc) sc_list;
 205         struct mtx              sc_mtx;
 206         struct cv               sc_cv;
 207         uint32_t                sc_brtmax;      /* max # of addresses */
 208         uint32_t                sc_brtcnt;      /* cur. # of addresses */
 209         uint32_t                sc_brttimeout;  /* rt timeout in seconds */
 210         struct callout          sc_brcallout;   /* bridge callout */
 211         uint32_t                sc_iflist_ref;  /* refcount for sc_iflist */
 212         uint32_t                sc_iflist_xcnt; /* refcount for sc_iflist */
 213         LIST_HEAD(, bridge_iflist) sc_iflist;   /* member interface list */
 214         LIST_HEAD(, bridge_rtnode) *sc_rthash;  /* our forwarding table */
 215         LIST_HEAD(, bridge_rtnode) sc_rtlist;   /* list version of above */
 216         uint32_t                sc_rthash_key;  /* key for hash */
 217         LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */
 218         struct bstp_state       sc_stp;         /* STP state */
 219         uint32_t                sc_brtexceeded; /* # of cache drops */
 220         u_char                  sc_defaddr[6];  /* Default MAC address */
 221 };
 222
 223 static struct mtx       bridge_list_mtx;
 224 eventhandler_tag        bridge_detach_cookie = NULL;
 225
 226 int     bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
 227
 228 uma_zone_t bridge_rtnode_zone;
 229
 230 static int      bridge_clone_create(struct if_clone *, int, caddr_t);
 231 static void     bridge_clone_destroy(struct ifnet *);
 232
 233 static int      bridge_ioctl(struct ifnet *, u_long, caddr_t);
 234 static void     bridge_mutecaps(struct bridge_softc *);
 235 static void     bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
 236                     int);
 237 static void     bridge_ifdetach(void *arg __unused, struct ifnet *);
 238 static void     bridge_init(void *);
 239 static void     bridge_dummynet(struct mbuf *, struct ifnet *);
 240 static void     bridge_stop(struct ifnet *, int);
 241 static void     bridge_start(struct ifnet *);
 242 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
 243 static int      bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
 244                     struct rtentry *);
 245 static void     bridge_enqueue(struct bridge_softc *, struct ifnet *,
 246                     struct mbuf *);
 247 static void     bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
 248
 249 static void     bridge_forward(struct bridge_softc *, struct bridge_iflist *,
 250                     struct mbuf *m);
 251
 252 static void     bridge_timer(void *);
 253
 254 static void     bridge_broadcast(struct bridge_softc *, struct ifnet *,
 255                     struct mbuf *, int);
 256 static void     bridge_span(struct bridge_softc *, struct mbuf *);
 257
 258 static int      bridge_rtupdate(struct bridge_softc *, const uint8_t *,
 259                     uint16_t, struct bridge_iflist *, int, uint8_t);
 260 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
 261                     uint16_t);
 262 static void     bridge_rttrim(struct bridge_softc *);
 263 static void     bridge_rtage(struct bridge_softc *);
 264 static void     bridge_rtflush(struct bridge_softc *, int);
 265 static int      bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
 266                     uint16_t);
 267
 268 static int      bridge_rtable_init(struct bridge_softc *);
 269 static void     bridge_rtable_fini(struct bridge_softc *);
 270
 271 static int      bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
 272 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
 273                     const uint8_t *, uint16_t);
 274 static int      bridge_rtnode_insert(struct bridge_softc *,
 275                     struct bridge_rtnode *);
 276 static void     bridge_rtnode_destroy(struct bridge_softc *,
 277                     struct bridge_rtnode *);
 278 static void     bridge_rtable_expire(struct ifnet *, int);
 279 static void     bridge_state_change(struct ifnet *, int);
 280
 281 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
 282                     const char *name);
 283 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
 284                     struct ifnet *ifp);
 285 static void     bridge_delete_member(struct bridge_softc *,
 286                     struct bridge_iflist *, int);
 287 static void     bridge_delete_span(struct bridge_softc *,
 288                     struct bridge_iflist *);
 289
 290 static int      bridge_ioctl_add(struct bridge_softc *, void *);
 291 static int      bridge_ioctl_del(struct bridge_softc *, void *);
 292 static int      bridge_ioctl_gifflags(struct bridge_softc *, void *);
 293 static int      bridge_ioctl_sifflags(struct bridge_softc *, void *);
 294 static int      bridge_ioctl_scache(struct bridge_softc *, void *);
 295 static int      bridge_ioctl_gcache(struct bridge_softc *, void *);
 296 static int      bridge_ioctl_gifs(struct bridge_softc *, void *);
 297 static int      bridge_ioctl_rts(struct bridge_softc *, void *);
 298 static int      bridge_ioctl_saddr(struct bridge_softc *, void *);
 299 static int      bridge_ioctl_sto(struct bridge_softc *, void *);
 300 static int      bridge_ioctl_gto(struct bridge_softc *, void *);
 301 static int      bridge_ioctl_daddr(struct bridge_softc *, void *);
 302 static int      bridge_ioctl_flush(struct bridge_softc *, void *);
 303 static int      bridge_ioctl_gpri(struct bridge_softc *, void *);
 304 static int      bridge_ioctl_spri(struct bridge_softc *, void *);
 305 static int      bridge_ioctl_ght(struct bridge_softc *, void *);
 306 static int      bridge_ioctl_sht(struct bridge_softc *, void *);
 307 static int      bridge_ioctl_gfd(struct bridge_softc *, void *);
 308 static int      bridge_ioctl_sfd(struct bridge_softc *, void *);
 309 static int      bridge_ioctl_gma(struct bridge_softc *, void *);
 310 static int      bridge_ioctl_sma(struct bridge_softc *, void *);
 311 static int      bridge_ioctl_sifprio(struct bridge_softc *, void *);
 312 static int      bridge_ioctl_sifcost(struct bridge_softc *, void *);
 313 static int      bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
 314 static int      bridge_ioctl_addspan(struct bridge_softc *, void *);
 315 static int      bridge_ioctl_delspan(struct bridge_softc *, void *);
 316 static int      bridge_ioctl_gbparam(struct bridge_softc *, void *);
 317 static int      bridge_ioctl_grte(struct bridge_softc *, void *);
 318 static int      bridge_ioctl_gifsstp(struct bridge_softc *, void *);
 319 static int      bridge_ioctl_sproto(struct bridge_softc *, void *);
 320 static int      bridge_ioctl_stxhc(struct bridge_softc *, void *);
 321 static int      bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
 322                     int);
 323 static int      bridge_ip_checkbasic(struct mbuf **mp);
 324 #ifdef INET6
 325 static int      bridge_ip6_checkbasic(struct mbuf **mp);
 326 #endif /* INET6 */
 327 static int      bridge_fragment(struct ifnet *, struct mbuf *,
 328                     struct ether_header *, int, struct llc *);
 329
 330 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
 331 #define VLANTAGOF(_m)   \
 332     (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
 333
 334 static struct bstp_cb_ops bridge_ops = {
 335         .bcb_state = bridge_state_change,
 336         .bcb_rtage = bridge_rtable_expire
 337 };
 338
 339 SYSCTL_DECL(_net_link);
 340 SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
 341
 342 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */
 343 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */
 344 static int pfil_member = 1; /* run pfil hooks on the member interface */
 345 static int pfil_ipfw = 0;   /* layer2 filter with ipfw */
 346 static int pfil_ipfw_arp = 0;   /* layer2 filter with ipfw */
 347 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for
 348                                    locally destined packets */
 349 static int log_stp   = 0;   /* log STP state changes */
 350 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW,
 351     &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled");
 352 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW,
 353     &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2");
 354 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW,
 355     &pfil_bridge, 0, "Packet filter on the bridge interface");
 356 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW,
 357     &pfil_member, 0, "Packet filter on the member interface");
 358 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW,
 359     &pfil_local_phys, 0,
 360     "Packet filter on the physical interface for locally destined packets");
 361 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW,
 362     &log_stp, 0, "Log STP state changes");
 363
 364 struct bridge_control {
 365         int     (*bc_func)(struct bridge_softc *, void *);
 366         int     bc_argsize;
 367         int     bc_flags;
 368 };
 369
 370 #define BC_F_COPYIN             0x01    /* copy arguments in */
 371 #define BC_F_COPYOUT            0x02    /* copy arguments out */
 372 #define BC_F_SUSER              0x04    /* do super-user check */
 373
 374 const struct bridge_control bridge_control_table[] = {
 375         { bridge_ioctl_add,             sizeof(struct ifbreq),
 376           BC_F_COPYIN|BC_F_SUSER },
 377         { bridge_ioctl_del,             sizeof(struct ifbreq),
 378           BC_F_COPYIN|BC_F_SUSER },
 379
 380         { bridge_ioctl_gifflags,        sizeof(struct ifbreq),
 381           BC_F_COPYIN|BC_F_COPYOUT },
 382         { bridge_ioctl_sifflags,        sizeof(struct ifbreq),
 383           BC_F_COPYIN|BC_F_SUSER },
 384
 385         { bridge_ioctl_scache,          sizeof(struct ifbrparam),
 386           BC_F_COPYIN|BC_F_SUSER },
 387         { bridge_ioctl_gcache,          sizeof(struct ifbrparam),
 388           BC_F_COPYOUT },
 389
 390         { bridge_ioctl_gifs,            sizeof(struct ifbifconf),
 391           BC_F_COPYIN|BC_F_COPYOUT },
 392         { bridge_ioctl_rts,             sizeof(struct ifbaconf),
 393           BC_F_COPYIN|BC_F_COPYOUT },
 394
 395         { bridge_ioctl_saddr,           sizeof(struct ifbareq),
 396           BC_F_COPYIN|BC_F_SUSER },
 397
 398         { bridge_ioctl_sto,             sizeof(struct ifbrparam),
 399           BC_F_COPYIN|BC_F_SUSER },
 400         { bridge_ioctl_gto,             sizeof(struct ifbrparam),
 401           BC_F_COPYOUT },
 402
 403         { bridge_ioctl_daddr,           sizeof(struct ifbareq),
 404           BC_F_COPYIN|BC_F_SUSER },
 405
 406         { bridge_ioctl_flush,           sizeof(struct ifbreq),
 407           BC_F_COPYIN|BC_F_SUSER },
 408
 409         { bridge_ioctl_gpri,            sizeof(struct ifbrparam),
 410           BC_F_COPYOUT },
 411         { bridge_ioctl_spri,            sizeof(struct ifbrparam),
 412           BC_F_COPYIN|BC_F_SUSER },
 413
 414         { bridge_ioctl_ght,             sizeof(struct ifbrparam),
 415           BC_F_COPYOUT },
 416         { bridge_ioctl_sht,             sizeof(struct ifbrparam),
 417           BC_F_COPYIN|BC_F_SUSER },
 418
 419         { bridge_ioctl_gfd,             sizeof(struct ifbrparam),
 420           BC_F_COPYOUT },
 421         { bridge_ioctl_sfd,             sizeof(struct ifbrparam),
 422           BC_F_COPYIN|BC_F_SUSER },
 423
 424         { bridge_ioctl_gma,             sizeof(struct ifbrparam),
 425           BC_F_COPYOUT },
 426         { bridge_ioctl_sma,             sizeof(struct ifbrparam),
 427           BC_F_COPYIN|BC_F_SUSER },
 428
 429         { bridge_ioctl_sifprio,         sizeof(struct ifbreq),
 430           BC_F_COPYIN|BC_F_SUSER },
 431
 432         { bridge_ioctl_sifcost,         sizeof(struct ifbreq),
 433           BC_F_COPYIN|BC_F_SUSER },
 434
 435         { bridge_ioctl_addspan,         sizeof(struct ifbreq),
 436           BC_F_COPYIN|BC_F_SUSER },
 437         { bridge_ioctl_delspan,         sizeof(struct ifbreq),
 438           BC_F_COPYIN|BC_F_SUSER },
 439
 440         { bridge_ioctl_gbparam,         sizeof(struct ifbropreq),
 441           BC_F_COPYOUT },
 442
 443         { bridge_ioctl_grte,            sizeof(struct ifbrparam),
 444           BC_F_COPYOUT },
 445
 446         { bridge_ioctl_gifsstp,         sizeof(struct ifbpstpconf),
 447           BC_F_COPYIN|BC_F_COPYOUT },
 448
 449         { bridge_ioctl_sproto,          sizeof(struct ifbrparam),
 450           BC_F_COPYIN|BC_F_SUSER },
 451
 452         { bridge_ioctl_stxhc,           sizeof(struct ifbrparam),
 453           BC_F_COPYIN|BC_F_SUSER },
 454
 455         { bridge_ioctl_sifmaxaddr,      sizeof(struct ifbreq),
 456           BC_F_COPYIN|BC_F_SUSER },
 457
 458 };
 459 const int bridge_control_table_size =
 460     sizeof(bridge_control_table) / sizeof(bridge_control_table[0]);
 461
 462 LIST_HEAD(, bridge_softc) bridge_list;
 463
 464 IFC_SIMPLE_DECLARE(bridge, 0);
 465
 466 static int
 467 bridge_modevent(module_t mod, int type, void *data)
 468 {
 469
 470         switch (type) {
 471         case MOD_LOAD:
 472                 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF);
 473                 if_clone_attach(&bridge_cloner);
 474                 bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
 475                     sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
 476                     UMA_ALIGN_PTR, 0);
 477                 LIST_INIT(&bridge_list);
 478                 bridge_input_p = bridge_input;
 479                 bridge_output_p = bridge_output;
 480                 bridge_dn_p = bridge_dummynet;
 481                 bridge_detach_cookie = EVENTHANDLER_REGISTER(
 482                     ifnet_departure_event, bridge_ifdetach, NULL,
 483                     EVENTHANDLER_PRI_ANY);
 484                 break;
 485         case MOD_UNLOAD:
 486                 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
 487                     bridge_detach_cookie);
 488                 if_clone_detach(&bridge_cloner);
 489                 uma_zdestroy(bridge_rtnode_zone);
 490                 bridge_input_p = NULL;
 491                 bridge_output_p = NULL;
 492                 bridge_dn_p = NULL;
 493                 mtx_destroy(&bridge_list_mtx);
 494                 break;
 495         default:
 496                 return (EOPNOTSUPP);
 497         }
 498         return (0);
 499 }
 500
 501 static moduledata_t bridge_mod = {
 502         "if_bridge",
 503         bridge_modevent,
 504         0
 505 };
 506
 507 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
 508 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
 509
 510 /*
 511  * handler for net.link.bridge.pfil_ipfw
 512  */
 513 static int
 514 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
 515 {
 516         int enable = pfil_ipfw;
 517         int error;
 518
 519         error = sysctl_handle_int(oidp, &enable, 0, req);
 520         enable = (enable) ? 1 : 0;
 521
 522         if (enable != pfil_ipfw) {
 523                 pfil_ipfw = enable;
 524
 525                 /*
 526                  * Disable pfil so that ipfw doesnt run twice, if the user
 527                  * really wants both then they can re-enable pfil_bridge and/or
 528                  * pfil_member. Also allow non-ip packets as ipfw can filter by
 529                  * layer2 type.
 530                  */
 531                 if (pfil_ipfw) {
 532                         pfil_onlyip = 0;
 533                         pfil_bridge = 0;
 534                         pfil_member = 0;
 535                 }
 536         }
 537
 538         return (error);
 539 }
 540 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW,
 541             &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW");
 542
 543 /*
 544  * bridge_clone_create:
 545  *
 546  *      Create a new bridge instance.
 547  */
 548 static int
 549 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
 550 {
 551         struct bridge_softc *sc, *sc2;
 552         struct ifnet *bifp, *ifp;
 553         int retry;
 554
 555         sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
 556         ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
 557         if (ifp == NULL) {
 558                 free(sc, M_DEVBUF);
 559                 return (ENOSPC);
 560         }
 561
 562         BRIDGE_LOCK_INIT(sc);
 563         sc->sc_brtmax = BRIDGE_RTABLE_MAX;
 564         sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
 565
 566         /* Initialize our routing table. */
 567         bridge_rtable_init(sc);
 568
 569         callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
 570
 571         LIST_INIT(&sc->sc_iflist);
 572         LIST_INIT(&sc->sc_spanlist);
 573
 574         ifp->if_softc = sc;
 575         if_initname(ifp, ifc->ifc_name, unit);
 576         ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
 577         ifp->if_ioctl = bridge_ioctl;
 578         ifp->if_start = bridge_start;
 579         ifp->if_init = bridge_init;
 580         ifp->if_type = IFT_BRIDGE;
 581         IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
 582         ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 583         IFQ_SET_READY(&ifp->if_snd);
 584
 585         /*
 586          * Generate a random ethernet address with a locally administered
 587          * address.
 588          *
 589          * Since we are using random ethernet addresses for the bridge, it is
 590          * possible that we might have address collisions, so make sure that
 591          * this hardware address isn't already in use on another bridge.
 592          */
 593         for (retry = 1; retry != 0;) {
 594                 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1);
 595                 sc->sc_defaddr[0] &= ~1;        /* clear multicast bit */
 596                 sc->sc_defaddr[0] |= 2;         /* set the LAA bit */
 597                 retry = 0;
 598                 mtx_lock(&bridge_list_mtx);
 599                 LIST_FOREACH(sc2, &bridge_list, sc_list) {
 600                         bifp = sc2->sc_ifp;
 601                         if (memcmp(sc->sc_defaddr,
 602                             IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0)
 603                                 retry = 1;
 604                 }
 605                 mtx_unlock(&bridge_list_mtx);
 606         }
 607
 608         bstp_attach(&sc->sc_stp, &bridge_ops);
 609         ether_ifattach(ifp, sc->sc_defaddr);
 610         /* Now undo some of the damage... */
 611         ifp->if_baudrate = 0;
 612         ifp->if_type = IFT_BRIDGE;
 613
 614         mtx_lock(&bridge_list_mtx);
 615         LIST_INSERT_HEAD(&bridge_list, sc, sc_list);
 616         mtx_unlock(&bridge_list_mtx);
 617
 618         return (0);
 619 }
 620
 621 /*
 622  * bridge_clone_destroy:
 623  *
 624  *      Destroy a bridge instance.
 625  */
 626 static void
 627 bridge_clone_destroy(struct ifnet *ifp)
 628 {
 629         struct bridge_softc *sc = ifp->if_softc;
 630         struct bridge_iflist *bif;
 631
 632         BRIDGE_LOCK(sc);
 633
 634         bridge_stop(ifp, 1);
 635         ifp->if_flags &= ~IFF_UP;
 636
 637         while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
 638                 bridge_delete_member(sc, bif, 0);
 639
 640         while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
 641                 bridge_delete_span(sc, bif);
 642         }
 643
 644         BRIDGE_UNLOCK(sc);
 645
 646         callout_drain(&sc->sc_brcallout);
 647
 648         mtx_lock(&bridge_list_mtx);
 649         LIST_REMOVE(sc, sc_list);
 650         mtx_unlock(&bridge_list_mtx);
 651
 652         bstp_detach(&sc->sc_stp);
 653         ether_ifdetach(ifp);
 654         if_free_type(ifp, IFT_ETHER);
 655
 656         /* Tear down the routing table. */
 657         bridge_rtable_fini(sc);
 658
 659         BRIDGE_LOCK_DESTROY(sc);
 660         free(sc, M_DEVBUF);
 661 }
 662
 663 /*
 664  * bridge_ioctl:
 665  *
 666  *      Handle a control request from the operator.
 667  */
 668 static int
 669 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
 670 {
 671         struct bridge_softc *sc = ifp->if_softc;
 672         struct thread *td = curthread;
 673         union {
 674                 struct ifbreq ifbreq;
 675                 struct ifbifconf ifbifconf;
 676                 struct ifbareq ifbareq;
 677                 struct ifbaconf ifbaconf;
 678                 struct ifbrparam ifbrparam;
 679                 struct ifbropreq ifbropreq;
 680         } args;
 681         struct ifdrv *ifd = (struct ifdrv *) data;
 682         const struct bridge_control *bc;
 683         int error = 0;
 684
 685         switch (cmd) {
 686
 687         case SIOCADDMULTI:
 688         case SIOCDELMULTI:
 689                 break;
 690
 691         case SIOCGDRVSPEC:
 692         case SIOCSDRVSPEC:
 693                 if (ifd->ifd_cmd >= bridge_control_table_size) {
 694                         error = EINVAL;
 695                         break;
 696                 }
 697                 bc = &bridge_control_table[ifd->ifd_cmd];
 698
 699                 if (cmd == SIOCGDRVSPEC &&
 700                     (bc->bc_flags & BC_F_COPYOUT) == 0) {
 701                         error = EINVAL;
 702                         break;
 703                 }
 704                 else if (cmd == SIOCSDRVSPEC &&
 705                     (bc->bc_flags & BC_F_COPYOUT) != 0) {
 706                         error = EINVAL;
 707                         break;
 708                 }
 709
 710                 if (bc->bc_flags & BC_F_SUSER) {
 711                         error = priv_check(td, PRIV_NET_BRIDGE);
 712                         if (error)
 713                                 break;
 714                 }
 715
 716                 if (ifd->ifd_len != bc->bc_argsize ||
 717                     ifd->ifd_len > sizeof(args)) {
 718                         error = EINVAL;
 719                         break;
 720                 }
 721
 722                 bzero(&args, sizeof(args));
 723                 if (bc->bc_flags & BC_F_COPYIN) {
 724                         error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
 725                         if (error)
 726                                 break;
 727                 }
 728
 729                 BRIDGE_LOCK(sc);
 730                 error = (*bc->bc_func)(sc, &args);
 731                 BRIDGE_UNLOCK(sc);
 732                 if (error)
 733                         break;
 734
 735                 if (bc->bc_flags & BC_F_COPYOUT)
 736                         error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
 737
 738                 break;
 739
 740         case SIOCSIFFLAGS:
 741                 if (!(ifp->if_flags & IFF_UP) &&
 742                     (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 743                         /*
 744                          * If interface is marked down and it is running,
 745                          * then stop and disable it.
 746                          */
 747                         BRIDGE_LOCK(sc);
 748                         bridge_stop(ifp, 1);
 749                         BRIDGE_UNLOCK(sc);
 750                 } else if ((ifp->if_flags & IFF_UP) &&
 751                     !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 752                         /*
 753                          * If interface is marked up and it is stopped, then
 754                          * start it.
 755                          */
 756                         (*ifp->if_init)(sc);
 757                 }
 758                 break;
 759
 760         case SIOCSIFMTU:
 761                 /* Do not allow the MTU to be changed on the bridge */
 762                 error = EINVAL;
 763                 break;
 764
 765         default:
 766                 /*
 767                  * drop the lock as ether_ioctl() will call bridge_start() and
 768                  * cause the lock to be recursed.
 769                  */
 770                 error = ether_ioctl(ifp, cmd, data);
 771                 break;
 772         }
 773
 774         return (error);
 775 }
 776
 777 /*
 778  * bridge_mutecaps:
 779  *
 780  *      Clear or restore unwanted capabilities on the member interface
 781  */
 782 static void
 783 bridge_mutecaps(struct bridge_softc *sc)
 784 {
 785         struct bridge_iflist *bif;
 786         int enabled, mask;
 787
 788         /* Initial bitmask of capabilities to test */
 789         mask = BRIDGE_IFCAPS_MASK;
 790
 791         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 792                 /* Every member must support it or its disabled */
 793                 mask &= bif->bif_savedcaps;
 794         }
 795
 796         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 797                 enabled = bif->bif_ifp->if_capenable;
 798                 /* strip off mask bits and enable them again if allowed */
 799                 enabled &= ~BRIDGE_IFCAPS_MASK;
 800                 enabled |= mask;
 801                 /*
 802                  * Receive offload can only be enabled if all members also
 803                  * support send offload.
 804                  */
 805                 if ((enabled & IFCAP_TSO) == 0)
 806                         enabled &= ~IFCAP_LRO;
 807
 808                 bridge_set_ifcap(sc, bif, enabled);
 809         }
 810
 811 }
 812
 813 static void
 814 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
 815 {
 816         struct ifnet *ifp = bif->bif_ifp;
 817         struct ifreq ifr;
 818         int error;
 819
 820         bzero(&ifr, sizeof(ifr));
 821         ifr.ifr_reqcap = set;
 822
 823         if (ifp->if_capenable != set) {
 824                 IFF_LOCKGIANT(ifp);
 825                 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
 826                 IFF_UNLOCKGIANT(ifp);
 827                 if (error)
 828                         if_printf(sc->sc_ifp,
 829                             "error setting interface capabilities on %s\n",
 830                             ifp->if_xname);
 831         }
 832 }
 833
 834 /*
 835  * bridge_lookup_member:
 836  *
 837  *      Lookup a bridge member interface.
 838  */
 839 static struct bridge_iflist *
 840 bridge_lookup_member(struct bridge_softc *sc, const char *name)
 841 {
 842         struct bridge_iflist *bif;
 843         struct ifnet *ifp;
 844
 845         BRIDGE_LOCK_ASSERT(sc);
 846
 847         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 848                 ifp = bif->bif_ifp;
 849                 if (strcmp(ifp->if_xname, name) == 0)
 850                         return (bif);
 851         }
 852
 853         return (NULL);
 854 }
 855
 856 /*
 857  * bridge_lookup_member_if:
 858  *
 859  *      Lookup a bridge member interface by ifnet*.
 860  */
 861 static struct bridge_iflist *
 862 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
 863 {
 864         struct bridge_iflist *bif;
 865
 866         BRIDGE_LOCK_ASSERT(sc);
 867
 868         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 869                 if (bif->bif_ifp == member_ifp)
 870                         return (bif);
 871         }
 872
 873         return (NULL);
 874 }
 875
 876 /*
 877  * bridge_delete_member:
 878  *
 879  *      Delete the specified member interface.
 880  */
 881 static void
 882 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
 883     int gone)
 884 {
 885         struct ifnet *ifs = bif->bif_ifp;
 886         struct ifnet *fif = NULL;
 887
 888         BRIDGE_LOCK_ASSERT(sc);
 889
 890         if (!gone) {
 891                 switch (ifs->if_type) {
 892                 case IFT_ETHER:
 893                 case IFT_L2VLAN:
 894                         /*
 895                          * Take the interface out of promiscuous mode.
 896                          */
 897                         (void) ifpromisc(ifs, 0);
 898                         break;
 899
 900                 case IFT_GIF:
 901                         break;
 902
 903                 default:
 904 #ifdef DIAGNOSTIC
 905                         panic("bridge_delete_member: impossible");
 906 #endif
 907                         break;
 908                 }
 909                 /* reneable any interface capabilities */
 910                 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
 911         }
 912
 913         if (bif->bif_flags & IFBIF_STP)
 914                 bstp_disable(&bif->bif_stp);
 915
 916         ifs->if_bridge = NULL;
 917         BRIDGE_XLOCK(sc);
 918         LIST_REMOVE(bif, bif_next);
 919         BRIDGE_XDROP(sc);
 920
 921         /*
 922          * If removing the interface that gave the bridge its mac address, set
 923          * the mac address of the bridge to the address of the next member, or
 924          * to its default address if no members are left.
 925          */
 926         if (!memcmp(IF_LLADDR(sc->sc_ifp), IF_LLADDR(ifs), ETHER_ADDR_LEN)) {
 927                 if (LIST_EMPTY(&sc->sc_iflist))
 928                         bcopy(sc->sc_defaddr,
 929                             IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
 930                 else {
 931                         fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp;
 932                         bcopy(IF_LLADDR(fif),
 933                             IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
 934                 }
 935         }
 936
 937         bridge_mutecaps(sc);    /* recalcuate now this interface is removed */
 938         bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
 939         KASSERT(bif->bif_addrcnt == 0,
 940             ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
 941
 942         BRIDGE_UNLOCK(sc);
 943         bstp_destroy(&bif->bif_stp);    /* prepare to free */
 944         BRIDGE_LOCK(sc);
 945         free(bif, M_DEVBUF);
 946 }
 947
 948 /*
 949  * bridge_delete_span:
 950  *
 951  *      Delete the specified span interface.
 952  */
 953 static void
 954 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
 955 {
 956         BRIDGE_LOCK_ASSERT(sc);
 957
 958         KASSERT(bif->bif_ifp->if_bridge == NULL,
 959             ("%s: not a span interface", __func__));
 960
 961         LIST_REMOVE(bif, bif_next);
 962         free(bif, M_DEVBUF);
 963 }
 964
 965 static int
 966 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
 967 {
 968         struct ifbreq *req = arg;
 969         struct bridge_iflist *bif = NULL;
 970         struct ifnet *ifs;
 971         int error = 0;
 972
 973         ifs = ifunit(req->ifbr_ifsname);
 974         if (ifs == NULL)
 975                 return (ENOENT);
 976         if (ifs->if_ioctl == NULL)      /* must be supported */
 977                 return (EINVAL);
 978
 979         /* If it's in the span list, it can't be a member. */
 980         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
 981                 if (ifs == bif->bif_ifp)
 982                         return (EBUSY);
 983
 984         /* Allow the first Ethernet member to define the MTU */
 985         if (ifs->if_type != IFT_GIF) {
 986                 if (LIST_EMPTY(&sc->sc_iflist))
 987                         sc->sc_ifp->if_mtu = ifs->if_mtu;
 988                 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
 989                         if_printf(sc->sc_ifp, "invalid MTU for %s\n",
 990                             ifs->if_xname);
 991                         return (EINVAL);
 992                 }
 993         }
 994
 995         if (ifs->if_bridge == sc)
 996                 return (EEXIST);
 997
 998         if (ifs->if_bridge != NULL)
 999                 return (EBUSY);
1000
1001         bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1002         if (bif == NULL)
1003                 return (ENOMEM);
1004
1005         bif->bif_ifp = ifs;
1006         bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1007         bif->bif_savedcaps = ifs->if_capenable;
1008
1009         switch (ifs->if_type) {
1010         case IFT_ETHER:
1011         case IFT_L2VLAN:
1012                 /*
1013                  * Place the interface into promiscuous mode.
1014                  */
1015                 error = ifpromisc(ifs, 1);
1016                 if (error)
1017                         goto out;
1018                 break;
1019
1020         case IFT_GIF:
1021                 break;
1022
1023         default:
1024                 error = EINVAL;
1025                 goto out;
1026         }
1027
1028         /*
1029          * Assign the interface's MAC address to the bridge if it's the first
1030          * member and the MAC address of the bridge has not been changed from
1031          * the default randomly generated one.
1032          */
1033         if (LIST_EMPTY(&sc->sc_iflist) &&
1034             !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN))
1035                 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1036
1037         ifs->if_bridge = sc;
1038         bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1039         /*
1040          * XXX: XLOCK HERE!?!
1041          *
1042          * NOTE: insert_***HEAD*** should be safe for the traversals.
1043          */
1044         LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1045
1046         /* Set interface capabilities to the intersection set of all members */
1047         bridge_mutecaps(sc);
1048 out:
1049         if (error) {
1050                 if (bif != NULL)
1051                         free(bif, M_DEVBUF);
1052         }
1053         return (error);
1054 }
1055
1056 static int
1057 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1058 {
1059         struct ifbreq *req = arg;
1060         struct bridge_iflist *bif;
1061
1062         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1063         if (bif == NULL)
1064                 return (ENOENT);
1065
1066         bridge_delete_member(sc, bif, 0);
1067
1068         return (0);
1069 }
1070
1071 static int
1072 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1073 {
1074         struct ifbreq *req = arg;
1075         struct bridge_iflist *bif;
1076         struct bstp_port *bp;
1077
1078         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1079         if (bif == NULL)
1080                 return (ENOENT);
1081
1082         bp = &bif->bif_stp;
1083         req->ifbr_ifsflags = bif->bif_flags;
1084         req->ifbr_state = bp->bp_state;
1085         req->ifbr_priority = bp->bp_priority;
1086         req->ifbr_path_cost = bp->bp_path_cost;
1087         req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1088         req->ifbr_proto = bp->bp_protover;
1089         req->ifbr_role = bp->bp_role;
1090         req->ifbr_stpflags = bp->bp_flags;
1091         req->ifbr_addrcnt = bif->bif_addrcnt;
1092         req->ifbr_addrmax = bif->bif_addrmax;
1093         req->ifbr_addrexceeded = bif->bif_addrexceeded;
1094
1095         /* Copy STP state options as flags */
1096         if (bp->bp_operedge)
1097                 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1098         if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1099                 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1100         if (bp->bp_ptp_link)
1101                 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1102         if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1103                 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1104         if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1105                 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1106         if (bp->bp_flags & BSTP_PORT_ADMCOST)
1107                 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1108         return (0);
1109 }
1110
1111 static int
1112 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1113 {
1114         struct ifbreq *req = arg;
1115         struct bridge_iflist *bif;
1116         struct bstp_port *bp;
1117         int error;
1118
1119         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1120         if (bif == NULL)
1121                 return (ENOENT);
1122         bp = &bif->bif_stp;
1123
1124         if (req->ifbr_ifsflags & IFBIF_SPAN)
1125                 /* SPAN is readonly */
1126                 return (EINVAL);
1127
1128         if (req->ifbr_ifsflags & IFBIF_STP) {
1129                 if ((bif->bif_flags & IFBIF_STP) == 0) {
1130                         error = bstp_enable(&bif->bif_stp);
1131                         if (error)
1132                                 return (error);
1133                 }
1134         } else {
1135                 if ((bif->bif_flags & IFBIF_STP) != 0)
1136                         bstp_disable(&bif->bif_stp);
1137         }
1138
1139         /* Pass on STP flags */
1140         bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1141         bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1142         bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1143         bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1144
1145         /* Save the bits relating to the bridge */
1146         bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1147
1148         return (0);
1149 }
1150
1151 static int
1152 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1153 {
1154         struct ifbrparam *param = arg;
1155
1156         sc->sc_brtmax = param->ifbrp_csize;
1157         bridge_rttrim(sc);
1158
1159         return (0);
1160 }
1161
1162 static int
1163 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1164 {
1165         struct ifbrparam *param = arg;
1166
1167         param->ifbrp_csize = sc->sc_brtmax;
1168
1169         return (0);
1170 }
1171
1172 static int
1173 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1174 {
1175         struct ifbifconf *bifc = arg;
1176         struct bridge_iflist *bif;
1177         struct ifbreq breq;
1178         char *buf, *outbuf;
1179         int count, buflen, len, error = 0;
1180
1181         count = 0;
1182         LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1183                 count++;
1184         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1185                 count++;
1186
1187         buflen = sizeof(breq) * count;
1188         if (bifc->ifbic_len == 0) {
1189                 bifc->ifbic_len = buflen;
1190                 return (0);
1191         }
1192         BRIDGE_UNLOCK(sc);
1193         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1194         BRIDGE_LOCK(sc);
1195
1196         count = 0;
1197         buf = outbuf;
1198         len = min(bifc->ifbic_len, buflen);
1199         bzero(&breq, sizeof(breq));
1200         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1201                 if (len < sizeof(breq))
1202                         break;
1203
1204                 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1205                     sizeof(breq.ifbr_ifsname));
1206                 /* Fill in the ifbreq structure */
1207                 error = bridge_ioctl_gifflags(sc, &breq);
1208                 if (error)
1209                         break;
1210                 memcpy(buf, &breq, sizeof(breq));
1211                 count++;
1212                 buf += sizeof(breq);
1213                 len -= sizeof(breq);
1214         }
1215         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1216                 if (len < sizeof(breq))
1217                         break;
1218
1219                 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1220                     sizeof(breq.ifbr_ifsname));
1221                 breq.ifbr_ifsflags = bif->bif_flags;
1222                 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1223                 memcpy(buf, &breq, sizeof(breq));
1224                 count++;
1225                 buf += sizeof(breq);
1226                 len -= sizeof(breq);
1227         }
1228
1229         BRIDGE_UNLOCK(sc);
1230         bifc->ifbic_len = sizeof(breq) * count;
1231         error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1232         BRIDGE_LOCK(sc);
1233         free(outbuf, M_TEMP);
1234         return (error);
1235 }
1236
1237 static int
1238 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1239 {
1240         struct ifbaconf *bac = arg;
1241         struct bridge_rtnode *brt;
1242         struct ifbareq bareq;
1243         char *buf, *outbuf;
1244         int count, buflen, len, error = 0;
1245
1246         if (bac->ifbac_len == 0)
1247                 return (0);
1248
1249         count = 0;
1250         LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1251                 count++;
1252         buflen = sizeof(bareq) * count;
1253
1254         BRIDGE_UNLOCK(sc);
1255         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1256         BRIDGE_LOCK(sc);
1257
1258         count = 0;
1259         buf = outbuf;
1260         len = min(bac->ifbac_len, buflen);
1261         bzero(&bareq, sizeof(bareq));
1262         LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1263                 if (len < sizeof(bareq))
1264                         goto out;
1265                 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1266                     sizeof(bareq.ifba_ifsname));
1267                 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1268                 bareq.ifba_vlan = brt->brt_vlan;
1269                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1270                                 time_uptime < brt->brt_expire)
1271                         bareq.ifba_expire = brt->brt_expire - time_uptime;
1272                 else
1273                         bareq.ifba_expire = 0;
1274                 bareq.ifba_flags = brt->brt_flags;
1275
1276                 memcpy(buf, &bareq, sizeof(bareq));
1277                 count++;
1278                 buf += sizeof(bareq);
1279                 len -= sizeof(bareq);
1280         }
1281 out:
1282         BRIDGE_UNLOCK(sc);
1283         bac->ifbac_len = sizeof(bareq) * count;
1284         error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1285         BRIDGE_LOCK(sc);
1286         free(outbuf, M_TEMP);
1287         return (error);
1288 }
1289
1290 static int
1291 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1292 {
1293         struct ifbareq *req = arg;
1294         struct bridge_iflist *bif;
1295         int error;
1296
1297         bif = bridge_lookup_member(sc, req->ifba_ifsname);
1298         if (bif == NULL)
1299                 return (ENOENT);
1300
1301         error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1302             req->ifba_flags);
1303
1304         return (error);
1305 }
1306
1307 static int
1308 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1309 {
1310         struct ifbrparam *param = arg;
1311
1312         sc->sc_brttimeout = param->ifbrp_ctime;
1313         return (0);
1314 }
1315
1316 static int
1317 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1318 {
1319         struct ifbrparam *param = arg;
1320
1321         param->ifbrp_ctime = sc->sc_brttimeout;
1322         return (0);
1323 }
1324
1325 static int
1326 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1327 {
1328         struct ifbareq *req = arg;
1329
1330         return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
1331 }
1332
1333 static int
1334 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1335 {
1336         struct ifbreq *req = arg;
1337
1338         bridge_rtflush(sc, req->ifbr_ifsflags);
1339         return (0);
1340 }
1341
1342 static int
1343 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1344 {
1345         struct ifbrparam *param = arg;
1346         struct bstp_state *bs = &sc->sc_stp;
1347
1348         param->ifbrp_prio = bs->bs_bridge_priority;
1349         return (0);
1350 }
1351
1352 static int
1353 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1354 {
1355         struct ifbrparam *param = arg;
1356
1357         return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1358 }
1359
1360 static int
1361 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1362 {
1363         struct ifbrparam *param = arg;
1364         struct bstp_state *bs = &sc->sc_stp;
1365
1366         param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1367         return (0);
1368 }
1369
1370 static int
1371 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1372 {
1373         struct ifbrparam *param = arg;
1374
1375         return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1376 }
1377
1378 static int
1379 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1380 {
1381         struct ifbrparam *param = arg;
1382         struct bstp_state *bs = &sc->sc_stp;
1383
1384         param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1385         return (0);
1386 }
1387
1388 static int
1389 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1390 {
1391         struct ifbrparam *param = arg;
1392
1393         return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1394 }
1395
1396 static int
1397 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1398 {
1399         struct ifbrparam *param = arg;
1400         struct bstp_state *bs = &sc->sc_stp;
1401
1402         param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1403         return (0);
1404 }
1405
1406 static int
1407 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1408 {
1409         struct ifbrparam *param = arg;
1410
1411         return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1412 }
1413
1414 static int
1415 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1416 {
1417         struct ifbreq *req = arg;
1418         struct bridge_iflist *bif;
1419
1420         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1421         if (bif == NULL)
1422                 return (ENOENT);
1423
1424         return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1425 }
1426
1427 static int
1428 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1429 {
1430         struct ifbreq *req = arg;
1431         struct bridge_iflist *bif;
1432
1433         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1434         if (bif == NULL)
1435                 return (ENOENT);
1436
1437         return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1438 }
1439
1440 static int
1441 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1442 {
1443         struct ifbreq *req = arg;
1444         struct bridge_iflist *bif;
1445
1446         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1447         if (bif == NULL)
1448                 return (ENOENT);
1449
1450         bif->bif_addrmax = req->ifbr_addrmax;
1451         return (0);
1452 }
1453
1454 static int
1455 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1456 {
1457         struct ifbreq *req = arg;
1458         struct bridge_iflist *bif = NULL;
1459         struct ifnet *ifs;
1460
1461         ifs = ifunit(req->ifbr_ifsname);
1462         if (ifs == NULL)
1463                 return (ENOENT);
1464
1465         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1466                 if (ifs == bif->bif_ifp)
1467                         return (EBUSY);
1468
1469         if (ifs->if_bridge != NULL)
1470                 return (EBUSY);
1471
1472         switch (ifs->if_type) {
1473                 case IFT_ETHER:
1474                 case IFT_GIF:
1475                 case IFT_L2VLAN:
1476                         break;
1477                 default:
1478                         return (EINVAL);
1479         }
1480
1481         bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1482         if (bif == NULL)
1483                 return (ENOMEM);
1484
1485         bif->bif_ifp = ifs;
1486         bif->bif_flags = IFBIF_SPAN;
1487
1488         LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1489
1490         return (0);
1491 }
1492
1493 static int
1494 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1495 {
1496         struct ifbreq *req = arg;
1497         struct bridge_iflist *bif;
1498         struct ifnet *ifs;
1499
1500         ifs = ifunit(req->ifbr_ifsname);
1501         if (ifs == NULL)
1502                 return (ENOENT);
1503
1504         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1505                 if (ifs == bif->bif_ifp)
1506                         break;
1507
1508         if (bif == NULL)
1509                 return (ENOENT);
1510
1511         bridge_delete_span(sc, bif);
1512
1513         return (0);
1514 }
1515
1516 static int
1517 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1518 {
1519         struct ifbropreq *req = arg;
1520         struct bstp_state *bs = &sc->sc_stp;
1521         struct bstp_port *root_port;
1522
1523         req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1524         req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1525         req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1526
1527         root_port = bs->bs_root_port;
1528         if (root_port == NULL)
1529                 req->ifbop_root_port = 0;
1530         else
1531                 req->ifbop_root_port = root_port->bp_ifp->if_index;
1532
1533         req->ifbop_holdcount = bs->bs_txholdcount;
1534         req->ifbop_priority = bs->bs_bridge_priority;
1535         req->ifbop_protocol = bs->bs_protover;
1536         req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1537         req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1538         req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1539         req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1540         req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1541         req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1542
1543         return (0);
1544 }
1545
1546 static int
1547 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1548 {
1549         struct ifbrparam *param = arg;
1550
1551         param->ifbrp_cexceeded = sc->sc_brtexceeded;
1552         return (0);
1553 }
1554
1555 static int
1556 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1557 {
1558         struct ifbpstpconf *bifstp = arg;
1559         struct bridge_iflist *bif;
1560         struct bstp_port *bp;
1561         struct ifbpstpreq bpreq;
1562         char *buf, *outbuf;
1563         int count, buflen, len, error = 0;
1564
1565         count = 0;
1566         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1567                 if ((bif->bif_flags & IFBIF_STP) != 0)
1568                         count++;
1569         }
1570
1571         buflen = sizeof(bpreq) * count;
1572         if (bifstp->ifbpstp_len == 0) {
1573                 bifstp->ifbpstp_len = buflen;
1574                 return (0);
1575         }
1576
1577         BRIDGE_UNLOCK(sc);
1578         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1579         BRIDGE_LOCK(sc);
1580
1581         count = 0;
1582         buf = outbuf;
1583         len = min(bifstp->ifbpstp_len, buflen);
1584         bzero(&bpreq, sizeof(bpreq));
1585         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1586                 if (len < sizeof(bpreq))
1587                         break;
1588
1589                 if ((bif->bif_flags & IFBIF_STP) == 0)
1590                         continue;
1591
1592                 bp = &bif->bif_stp;
1593                 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1594                 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1595                 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1596                 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1597                 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1598                 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1599
1600                 memcpy(buf, &bpreq, sizeof(bpreq));
1601                 count++;
1602                 buf += sizeof(bpreq);
1603                 len -= sizeof(bpreq);
1604         }
1605
1606         BRIDGE_UNLOCK(sc);
1607         bifstp->ifbpstp_len = sizeof(bpreq) * count;
1608         error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1609         BRIDGE_LOCK(sc);
1610         free(outbuf, M_TEMP);
1611         return (error);
1612 }
1613
1614 static int
1615 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1616 {
1617         struct ifbrparam *param = arg;
1618
1619         return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1620 }
1621
1622 static int
1623 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1624 {
1625         struct ifbrparam *param = arg;
1626
1627         return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1628 }
1629
1630 /*
1631  * bridge_ifdetach:
1632  *
1633  *      Detach an interface from a bridge.  Called when a member
1634  *      interface is detaching.
1635  */
1636 static void
1637 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1638 {
1639         struct bridge_softc *sc = ifp->if_bridge;
1640         struct bridge_iflist *bif;
1641
1642         /* Check if the interface is a bridge member */
1643         if (sc != NULL) {
1644                 BRIDGE_LOCK(sc);
1645
1646                 bif = bridge_lookup_member_if(sc, ifp);
1647                 if (bif != NULL)
1648                         bridge_delete_member(sc, bif, 1);
1649
1650                 BRIDGE_UNLOCK(sc);
1651                 return;
1652         }
1653
1654         /* Check if the interface is a span port */
1655         mtx_lock(&bridge_list_mtx);
1656         LIST_FOREACH(sc, &bridge_list, sc_list) {
1657                 BRIDGE_LOCK(sc);
1658                 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1659                         if (ifp == bif->bif_ifp) {
1660                                 bridge_delete_span(sc, bif);
1661                                 break;
1662                         }
1663
1664                 BRIDGE_UNLOCK(sc);
1665         }
1666         mtx_unlock(&bridge_list_mtx);
1667 }
1668
1669 /*
1670  * bridge_init:
1671  *
1672  *      Initialize a bridge interface.
1673  */
1674 static void
1675 bridge_init(void *xsc)
1676 {
1677         struct bridge_softc *sc = (struct bridge_softc *)xsc;
1678         struct ifnet *ifp = sc->sc_ifp;
1679
1680         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1681                 return;
1682
1683         BRIDGE_LOCK(sc);
1684         callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1685             bridge_timer, sc);
1686
1687         ifp->if_drv_flags |= IFF_DRV_RUNNING;
1688         bstp_init(&sc->sc_stp);         /* Initialize Spanning Tree */
1689
1690         BRIDGE_UNLOCK(sc);
1691 }
1692
1693 /*
1694  * bridge_stop:
1695  *
1696  *      Stop the bridge interface.
1697  */
1698 static void
1699 bridge_stop(struct ifnet *ifp, int disable)
1700 {
1701         struct bridge_softc *sc = ifp->if_softc;
1702
1703         BRIDGE_LOCK_ASSERT(sc);
1704
1705         if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1706                 return;
1707
1708         callout_stop(&sc->sc_brcallout);
1709         bstp_stop(&sc->sc_stp);
1710
1711         bridge_rtflush(sc, IFBF_FLUSHDYN);
1712
1713         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1714 }
1715
1716 /*
1717  * bridge_enqueue:
1718  *
1719  *      Enqueue a packet on a bridge member interface.
1720  *
1721  */
1722 static void
1723 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
1724 {
1725         int len, err = 0;
1726         short mflags;
1727         struct mbuf *m0;
1728
1729         len = m->m_pkthdr.len;
1730         mflags = m->m_flags;
1731
1732         /* We may be sending a fragment so traverse the mbuf */
1733         for (; m; m = m0) {
1734                 m0 = m->m_nextpkt;
1735                 m->m_nextpkt = NULL;
1736
1737                 /*
1738                  * If underlying interface can not do VLAN tag insertion itself
1739                  * then attach a packet tag that holds it.
1740                  */
1741                 if ((m->m_flags & M_VLANTAG) &&
1742                     (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
1743                         m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
1744                         if (m == NULL) {
1745                                 if_printf(dst_ifp,
1746                                     "unable to prepend VLAN header\n");
1747                                 dst_ifp->if_oerrors++;
1748                                 continue;
1749                         }
1750                         m->m_flags &= ~M_VLANTAG;
1751                 }
1752
1753                 if (err == 0)
1754                         IFQ_ENQUEUE(&dst_ifp->if_snd, m, err);
1755         }
1756
1757         if (err == 0) {
1758
1759                 sc->sc_ifp->if_opackets++;
1760                 sc->sc_ifp->if_obytes += len;
1761
1762                 dst_ifp->if_obytes += len;
1763
1764                 if (mflags & M_MCAST) {
1765                         sc->sc_ifp->if_omcasts++;
1766                         dst_ifp->if_omcasts++;
1767                 }
1768         }
1769
1770         if ((dst_ifp->if_drv_flags & IFF_DRV_OACTIVE) == 0)
1771                 (*dst_ifp->if_start)(dst_ifp);
1772 }
1773
1774 /*
1775  * bridge_dummynet:
1776  *
1777  *      Receive a queued packet from dummynet and pass it on to the output
1778  *      interface.
1779  *
1780  *      The mbuf has the Ethernet header already attached.
1781  */
1782 static void
1783 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
1784 {
1785         struct bridge_softc *sc;
1786
1787         sc = ifp->if_bridge;
1788
1789         /*
1790          * The packet didnt originate from a member interface. This should only
1791          * ever happen if a member interface is removed while packets are
1792          * queued for it.
1793          */
1794         if (sc == NULL) {
1795                 m_freem(m);
1796                 return;
1797         }
1798
1799         if (PFIL_HOOKED(&inet_pfil_hook)
1800 #ifdef INET6
1801             || PFIL_HOOKED(&inet6_pfil_hook)
1802 #endif
1803             ) {
1804                 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
1805                         return;
1806                 if (m == NULL)
1807                         return;
1808         }
1809
1810         bridge_enqueue(sc, ifp, m);
1811 }
1812
1813 /*
1814  * bridge_output:
1815  *
1816  *      Send output from a bridge member interface.  This
1817  *      performs the bridging function for locally originated
1818  *      packets.
1819  *
1820  *      The mbuf has the Ethernet header already attached.  We must
1821  *      enqueue or free the mbuf before returning.
1822  */
1823 static int
1824 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
1825     struct rtentry *rt)
1826 {
1827         struct ether_header *eh;
1828         struct ifnet *dst_if;
1829         struct bridge_softc *sc;
1830         uint16_t vlan;
1831
1832         if (m->m_len < ETHER_HDR_LEN) {
1833                 m = m_pullup(m, ETHER_HDR_LEN);
1834                 if (m == NULL)
1835                         return (0);
1836         }
1837
1838         eh = mtod(m, struct ether_header *);
1839         sc = ifp->if_bridge;
1840         vlan = VLANTAGOF(m);
1841
1842         BRIDGE_LOCK(sc);
1843
1844         /*
1845          * If bridge is down, but the original output interface is up,
1846          * go ahead and send out that interface.  Otherwise, the packet
1847          * is dropped below.
1848          */
1849         if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1850                 dst_if = ifp;
1851                 goto sendunicast;
1852         }
1853
1854         /*
1855          * If the packet is a multicast, or we don't know a better way to
1856          * get there, send to all interfaces.
1857          */
1858         if (ETHER_IS_MULTICAST(eh->ether_dhost))
1859                 dst_if = NULL;
1860         else
1861                 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
1862         if (dst_if == NULL) {
1863                 struct bridge_iflist *bif;
1864                 struct mbuf *mc;
1865                 int error = 0, used = 0;
1866
1867                 bridge_span(sc, m);
1868
1869                 BRIDGE_LOCK2REF(sc, error);
1870                 if (error) {
1871                         m_freem(m);
1872                         return (0);
1873                 }
1874
1875                 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1876                         dst_if = bif->bif_ifp;
1877
1878                         if (dst_if->if_type == IFT_GIF)
1879                                 continue;
1880                         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
1881                                 continue;
1882
1883                         /*
1884                          * If this is not the original output interface,
1885                          * and the interface is participating in spanning
1886                          * tree, make sure the port is in a state that
1887                          * allows forwarding.
1888                          */
1889                         if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
1890                             bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
1891                                 continue;
1892
1893                         if (LIST_NEXT(bif, bif_next) == NULL) {
1894                                 used = 1;
1895                                 mc = m;
1896                         } else {
1897                                 mc = m_copypacket(m, M_DONTWAIT);
1898                                 if (mc == NULL) {
1899                                         sc->sc_ifp->if_oerrors++;
1900                                         continue;
1901                                 }
1902                         }
1903
1904                         bridge_enqueue(sc, dst_if, mc);
1905                 }
1906                 if (used == 0)
1907                         m_freem(m);
1908                 BRIDGE_UNREF(sc);
1909                 return (0);
1910         }
1911
1912 sendunicast:
1913         /*
1914          * XXX Spanning tree consideration here?
1915          */
1916
1917         bridge_span(sc, m);
1918         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1919                 m_freem(m);
1920                 BRIDGE_UNLOCK(sc);
1921                 return (0);
1922         }
1923
1924         BRIDGE_UNLOCK(sc);
1925         bridge_enqueue(sc, dst_if, m);
1926         return (0);
1927 }
1928
1929 /*
1930  * bridge_start:
1931  *
1932  *      Start output on a bridge.
1933  *
1934  */
1935 static void
1936 bridge_start(struct ifnet *ifp)
1937 {
1938         struct bridge_softc *sc;
1939         struct mbuf *m;
1940         struct ether_header *eh;
1941         struct ifnet *dst_if;
1942
1943         sc = ifp->if_softc;
1944
1945         ifp->if_drv_flags |= IFF_DRV_OACTIVE;
1946         for (;;) {
1947                 IFQ_DEQUEUE(&ifp->if_snd, m);
1948                 if (m == 0)
1949                         break;
1950                 ETHER_BPF_MTAP(ifp, m);
1951
1952                 eh = mtod(m, struct ether_header *);
1953                 dst_if = NULL;
1954
1955                 BRIDGE_LOCK(sc);
1956                 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
1957                         dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1);
1958                 }
1959
1960                 if (dst_if == NULL)
1961                         bridge_broadcast(sc, ifp, m, 0);
1962                 else {
1963                         BRIDGE_UNLOCK(sc);
1964                         bridge_enqueue(sc, dst_if, m);
1965                 }
1966         }
1967         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
1968 }
1969
1970 /*
1971  * bridge_forward:
1972  *
1973  *      The forwarding function of the bridge.
1974  *
1975  *      NOTE: Releases the lock on return.
1976  */
1977 static void
1978 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
1979     struct mbuf *m)
1980 {
1981         struct bridge_iflist *dbif;
1982         struct ifnet *src_if, *dst_if, *ifp;
1983         struct ether_header *eh;
1984         uint16_t vlan;
1985         uint8_t *dst;
1986         int error;
1987
1988         src_if = m->m_pkthdr.rcvif;
1989         ifp = sc->sc_ifp;
1990
1991         ifp->if_ipackets++;
1992         ifp->if_ibytes += m->m_pkthdr.len;
1993         vlan = VLANTAGOF(m);
1994
1995         if ((sbif->bif_flags & IFBIF_STP) &&
1996             sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
1997                 goto drop;
1998
1999         eh = mtod(m, struct ether_header *);
2000         dst = eh->ether_dhost;
2001
2002         /* If the interface is learning, record the address. */
2003         if (sbif->bif_flags & IFBIF_LEARNING) {
2004                 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2005                     sbif, 0, IFBAF_DYNAMIC);
2006                 /*
2007                  * If the interface has addresses limits then deny any source
2008                  * that is not in the cache.
2009                  */
2010                 if (error && sbif->bif_addrmax)
2011                         goto drop;
2012         }
2013
2014         if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2015             sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2016                 goto drop;
2017
2018         /*
2019          * At this point, the port either doesn't participate
2020          * in spanning tree or it is in the forwarding state.
2021          */
2022
2023         /*
2024          * If the packet is unicast, destined for someone on
2025          * "this" side of the bridge, drop it.
2026          */
2027         if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2028                 dst_if = bridge_rtlookup(sc, dst, vlan);
2029                 if (src_if == dst_if)
2030                         goto drop;
2031         } else {
2032                 /*
2033                  * Check if its a reserved multicast address, any address
2034                  * listed in 802.1D section 7.12.6 may not be forwarded by the
2035                  * bridge.
2036                  * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2037                  */
2038                 if (dst[0] == 0x01 && dst[1] == 0x80 &&
2039                     dst[2] == 0xc2 && dst[3] == 0x00 &&
2040                     dst[4] == 0x00 && dst[5] <= 0x0f)
2041                         goto drop;
2042
2043                 /* ...forward it to all interfaces. */
2044                 ifp->if_imcasts++;
2045                 dst_if = NULL;
2046         }
2047
2048         /*
2049          * If we have a destination interface which is a member of our bridge,
2050          * OR this is a unicast packet, push it through the bpf(4) machinery.
2051          * For broadcast or multicast packets, don't bother because it will
2052          * be reinjected into ether_input. We do this before we pass the packets
2053          * through the pfil(9) framework, as it is possible that pfil(9) will
2054          * drop the packet, or possibly modify it, making it difficult to debug
2055          * firewall issues on the bridge.
2056          */
2057         if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2058                 ETHER_BPF_MTAP(ifp, m);
2059
2060         /* run the packet filter */
2061         if (PFIL_HOOKED(&inet_pfil_hook)
2062 #ifdef INET6
2063             || PFIL_HOOKED(&inet6_pfil_hook)
2064 #endif
2065             ) {
2066                 BRIDGE_UNLOCK(sc);
2067                 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2068                         return;
2069                 if (m == NULL)
2070                         return;
2071                 BRIDGE_LOCK(sc);
2072         }
2073
2074         if (dst_if == NULL) {
2075                 bridge_broadcast(sc, src_if, m, 1);
2076                 return;
2077         }
2078
2079         /*
2080          * At this point, we're dealing with a unicast frame
2081          * going to a different interface.
2082          */
2083         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2084                 goto drop;
2085
2086         dbif = bridge_lookup_member_if(sc, dst_if);
2087         if (dbif == NULL)
2088                 /* Not a member of the bridge (anymore?) */
2089                 goto drop;
2090
2091         /* Private segments can not talk to each other */
2092         if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2093                 goto drop;
2094
2095         if ((dbif->bif_flags & IFBIF_STP) &&
2096             dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2097                 goto drop;
2098
2099         BRIDGE_UNLOCK(sc);
2100
2101         if (PFIL_HOOKED(&inet_pfil_hook)
2102 #ifdef INET6
2103             || PFIL_HOOKED(&inet6_pfil_hook)
2104 #endif
2105             ) {
2106                 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2107                         return;
2108                 if (m == NULL)
2109                         return;
2110         }
2111
2112         bridge_enqueue(sc, dst_if, m);
2113         return;
2114
2115 drop:
2116         BRIDGE_UNLOCK(sc);
2117         m_freem(m);
2118 }
2119
2120 /*
2121  * bridge_input:
2122  *
2123  *      Receive input from a member interface.  Queue the packet for
2124  *      bridging if it is not for us.
2125  */
2126 static struct mbuf *
2127 bridge_input(struct ifnet *ifp, struct mbuf *m)
2128 {
2129         struct bridge_softc *sc = ifp->if_bridge;
2130         struct bridge_iflist *bif, *bif2;
2131         struct ifnet *bifp;
2132         struct ether_header *eh;
2133         struct mbuf *mc, *mc2;
2134         uint16_t vlan;
2135         int error;
2136
2137         if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2138                 return (m);
2139
2140         bifp = sc->sc_ifp;
2141         vlan = VLANTAGOF(m);
2142
2143         /*
2144          * Implement support for bridge monitoring. If this flag has been
2145          * set on this interface, discard the packet once we push it through
2146          * the bpf(4) machinery, but before we do, increment the byte and
2147          * packet counters associated with this interface.
2148          */
2149         if ((bifp->if_flags & IFF_MONITOR) != 0) {
2150                 m->m_pkthdr.rcvif  = bifp;
2151                 ETHER_BPF_MTAP(bifp, m);
2152                 bifp->if_ipackets++;
2153                 bifp->if_ibytes += m->m_pkthdr.len;
2154                 m_freem(m);
2155                 return (NULL);
2156         }
2157         BRIDGE_LOCK(sc);
2158         bif = bridge_lookup_member_if(sc, ifp);
2159         if (bif == NULL) {
2160                 BRIDGE_UNLOCK(sc);
2161                 return (m);
2162         }
2163
2164         eh = mtod(m, struct ether_header *);
2165
2166         bridge_span(sc, m);
2167
2168         if (m->m_flags & (M_BCAST|M_MCAST)) {
2169                 /* Tap off 802.1D packets; they do not get forwarded. */
2170                 if (memcmp(eh->ether_dhost, bstp_etheraddr,
2171                     ETHER_ADDR_LEN) == 0) {
2172                         m = bstp_input(&bif->bif_stp, ifp, m);
2173                         if (m == NULL) {
2174                                 BRIDGE_UNLOCK(sc);
2175                                 return (NULL);
2176                         }
2177                 }
2178
2179                 if ((bif->bif_flags & IFBIF_STP) &&
2180                     bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2181                         BRIDGE_UNLOCK(sc);
2182                         return (m);
2183                 }
2184
2185                 /*
2186                  * Make a deep copy of the packet and enqueue the copy
2187                  * for bridge processing; return the original packet for
2188                  * local processing.
2189                  */
2190                 mc = m_dup(m, M_DONTWAIT);
2191                 if (mc == NULL) {
2192                         BRIDGE_UNLOCK(sc);
2193                         return (m);
2194                 }
2195
2196                 /* Perform the bridge forwarding function with the copy. */
2197                 bridge_forward(sc, bif, mc);
2198
2199                 /*
2200                  * Reinject the mbuf as arriving on the bridge so we have a
2201                  * chance at claiming multicast packets. We can not loop back
2202                  * here from ether_input as a bridge is never a member of a
2203                  * bridge.
2204                  */
2205                 KASSERT(bifp->if_bridge == NULL,
2206                     ("loop created in bridge_input"));
2207                 mc2 = m_dup(m, M_DONTWAIT);
2208                 if (mc2 != NULL) {
2209                         /* Keep the layer3 header aligned */
2210                         int i = min(mc2->m_pkthdr.len, max_protohdr);
2211                         mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2212                 }
2213                 if (mc2 != NULL) {
2214                         mc2->m_pkthdr.rcvif = bifp;
2215                         (*bifp->if_input)(bifp, mc2);
2216                 }
2217
2218                 /* Return the original packet for local processing. */
2219                 return (m);
2220         }
2221
2222         if ((bif->bif_flags & IFBIF_STP) &&
2223             bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2224                 BRIDGE_UNLOCK(sc);
2225                 return (m);
2226         }
2227
2228 #ifdef DEV_CARP
2229 #   define OR_CARP_CHECK_WE_ARE_DST(iface) \
2230         || ((iface)->if_carp \
2231             && carp_forus((iface)->if_carp, eh->ether_dhost))
2232 #   define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2233         || ((iface)->if_carp \
2234             && carp_forus((iface)->if_carp, eh->ether_shost))
2235 #else
2236 #   define OR_CARP_CHECK_WE_ARE_DST(iface)
2237 #   define OR_CARP_CHECK_WE_ARE_SRC(iface)
2238 #endif
2239
2240 #ifdef INET6
2241 #   define OR_PFIL_HOOKED_INET6 \
2242         || PFIL_HOOKED(&inet6_pfil_hook)
2243 #else
2244 #   define OR_PFIL_HOOKED_INET6
2245 #endif
2246
2247 #define GRAB_OUR_PACKETS(iface) \
2248         if ((iface)->if_type == IFT_GIF) \
2249                 continue; \
2250         /* It is destined for us. */ \
2251         if (memcmp(IF_LLADDR((iface)), eh->ether_dhost,  ETHER_ADDR_LEN) == 0 \
2252             OR_CARP_CHECK_WE_ARE_DST((iface))                           \
2253             ) {                                                         \
2254                 if ((iface)->if_type == IFT_BRIDGE) {                   \
2255                         ETHER_BPF_MTAP(iface, m);                       \
2256                         iface->if_ipackets++;                           \
2257                         /* Filter on the physical interface. */         \
2258                         if (pfil_local_phys &&                          \
2259                             (PFIL_HOOKED(&inet_pfil_hook)               \
2260                              OR_PFIL_HOOKED_INET6)) {                   \
2261                                 if (bridge_pfil(&m, NULL, ifp,          \
2262                                     PFIL_IN) != 0 || m == NULL) {       \
2263                                         BRIDGE_UNLOCK(sc);              \
2264                                         return (NULL);                  \
2265                                 }                                       \
2266                         }                                               \
2267                 }                                                       \
2268                 if (bif->bif_flags & IFBIF_LEARNING) {                  \
2269                         error = bridge_rtupdate(sc, eh->ether_shost,    \
2270                             vlan, bif, 0, IFBAF_DYNAMIC);               \
2271                         if (error && bif->bif_addrmax) {                \
2272                                 BRIDGE_UNLOCK(sc);                      \
2273                                 m_freem(m);                             \
2274                                 return (NULL);                          \
2275                         }                                               \
2276                 }                                                       \
2277                 m->m_pkthdr.rcvif = iface;                              \
2278                 BRIDGE_UNLOCK(sc);                                      \
2279                 return (m);                                             \
2280         }                                                               \
2281                                                                         \
2282         /* We just received a packet that we sent out. */               \
2283         if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2284             OR_CARP_CHECK_WE_ARE_SRC((iface))                   \
2285             ) {                                                         \
2286                 BRIDGE_UNLOCK(sc);                                      \
2287                 m_freem(m);                                             \
2288                 return (NULL);                                          \
2289         }
2290
2291         /*
2292          * Unicast.  Make sure it's not for the bridge.
2293          */
2294         do { GRAB_OUR_PACKETS(bifp) } while (0);
2295
2296         /*
2297          * Give a chance for ifp at first priority. This will help when the
2298          * packet comes through the interface like VLAN's with the same MACs
2299          * on several interfaces from the same bridge. This also will save
2300          * some CPU cycles in case the destination interface and the input
2301          * interface (eq ifp) are the same.
2302          */
2303         do { GRAB_OUR_PACKETS(ifp) } while (0);
2304
2305         /* Now check the all bridge members. */
2306         LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2307                 GRAB_OUR_PACKETS(bif2->bif_ifp)
2308         }
2309
2310 #undef OR_CARP_CHECK_WE_ARE_DST
2311 #undef OR_CARP_CHECK_WE_ARE_SRC
2312 #undef OR_PFIL_HOOKED_INET6
2313 #undef GRAB_OUR_PACKETS
2314
2315         /* Perform the bridge forwarding function. */
2316         bridge_forward(sc, bif, m);
2317
2318         return (NULL);
2319 }
2320
2321 /*
2322  * bridge_broadcast:
2323  *
2324  *      Send a frame to all interfaces that are members of
2325  *      the bridge, except for the one on which the packet
2326  *      arrived.
2327  *
2328  *      NOTE: Releases the lock on return.
2329  */
2330 static void
2331 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2332     struct mbuf *m, int runfilt)
2333 {
2334         struct bridge_iflist *dbif, *sbif;
2335         struct mbuf *mc;
2336         struct ifnet *dst_if;
2337         int error = 0, used = 0, i;
2338
2339         sbif = bridge_lookup_member_if(sc, src_if);
2340
2341         BRIDGE_LOCK2REF(sc, error);
2342         if (error) {
2343                 m_freem(m);
2344                 return;
2345         }
2346
2347         /* Filter on the bridge interface before broadcasting */
2348         if (runfilt && (PFIL_HOOKED(&inet_pfil_hook)
2349 #ifdef INET6
2350             || PFIL_HOOKED(&inet6_pfil_hook)
2351 #endif
2352             )) {
2353                 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2354                         goto out;
2355                 if (m == NULL)
2356                         goto out;
2357         }
2358
2359         LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2360                 dst_if = dbif->bif_ifp;
2361                 if (dst_if == src_if)
2362                         continue;
2363
2364                 /* Private segments can not talk to each other */
2365                 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2366                         continue;
2367
2368                 if ((dbif->bif_flags & IFBIF_STP) &&
2369                     dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2370                         continue;
2371
2372                 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2373                     (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2374                         continue;
2375
2376                 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2377                         continue;
2378
2379                 if (LIST_NEXT(dbif, bif_next) == NULL) {
2380                         mc = m;
2381                         used = 1;
2382                 } else {
2383                         mc = m_dup(m, M_DONTWAIT);
2384                         if (mc == NULL) {
2385                                 sc->sc_ifp->if_oerrors++;
2386                                 continue;
2387                         }
2388                 }
2389
2390                 /*
2391                  * Filter on the output interface. Pass a NULL bridge interface
2392                  * pointer so we do not redundantly filter on the bridge for
2393                  * each interface we broadcast on.
2394                  */
2395                 if (runfilt && (PFIL_HOOKED(&inet_pfil_hook)
2396 #ifdef INET6
2397                     || PFIL_HOOKED(&inet6_pfil_hook)
2398 #endif
2399                     )) {
2400                         if (used == 0) {
2401                                 /* Keep the layer3 header aligned */
2402                                 i = min(mc->m_pkthdr.len, max_protohdr);
2403                                 mc = m_copyup(mc, i, ETHER_ALIGN);
2404                                 if (mc == NULL) {
2405                                         sc->sc_ifp->if_oerrors++;
2406                                         continue;
2407                                 }
2408                         }
2409                         if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2410                                 continue;
2411                         if (mc == NULL)
2412                                 continue;
2413                 }
2414
2415                 bridge_enqueue(sc, dst_if, mc);
2416         }
2417         if (used == 0)
2418                 m_freem(m);
2419
2420 out:
2421         BRIDGE_UNREF(sc);
2422 }
2423
2424 /*
2425  * bridge_span:
2426  *
2427  *      Duplicate a packet out one or more interfaces that are in span mode,
2428  *      the original mbuf is unmodified.
2429  */
2430 static void
2431 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2432 {
2433         struct bridge_iflist *bif;
2434         struct ifnet *dst_if;
2435         struct mbuf *mc;
2436
2437         if (LIST_EMPTY(&sc->sc_spanlist))
2438                 return;
2439
2440         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2441                 dst_if = bif->bif_ifp;
2442
2443                 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2444                         continue;
2445
2446                 mc = m_copypacket(m, M_DONTWAIT);
2447                 if (mc == NULL) {
2448                         sc->sc_ifp->if_oerrors++;
2449                         continue;
2450                 }
2451
2452                 bridge_enqueue(sc, dst_if, mc);
2453         }
2454 }
2455
2456 /*
2457  * bridge_rtupdate:
2458  *
2459  *      Add a bridge routing entry.
2460  */
2461 static int
2462 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2463     struct bridge_iflist *bif, int setflags, uint8_t flags)
2464 {
2465         struct bridge_rtnode *brt;
2466         int error;
2467
2468         BRIDGE_LOCK_ASSERT(sc);
2469
2470         /* Check the source address is valid and not multicast. */
2471         if (ETHER_IS_MULTICAST(dst) ||
2472             (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2473              dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2474                 return (EINVAL);
2475
2476         /* 802.1p frames map to vlan 1 */
2477         if (vlan == 0)
2478                 vlan = 1;
2479
2480         /*
2481          * A route for this destination might already exist.  If so,
2482          * update it, otherwise create a new one.
2483          */
2484         if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2485                 if (sc->sc_brtcnt >= sc->sc_brtmax) {
2486                         sc->sc_brtexceeded++;
2487                         return (ENOSPC);
2488                 }
2489                 /* Check per interface address limits (if enabled) */
2490                 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2491                         bif->bif_addrexceeded++;
2492                         return (ENOSPC);
2493                 }
2494
2495                 /*
2496                  * Allocate a new bridge forwarding node, and
2497                  * initialize the expiration time and Ethernet
2498                  * address.
2499                  */
2500                 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2501                 if (brt == NULL)
2502                         return (ENOMEM);
2503
2504                 if (bif->bif_flags & IFBIF_STICKY)
2505                         brt->brt_flags = IFBAF_STICKY;
2506                 else
2507                         brt->brt_flags = IFBAF_DYNAMIC;
2508
2509                 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2510                 brt->brt_vlan = vlan;
2511
2512                 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2513                         uma_zfree(bridge_rtnode_zone, brt);
2514                         return (error);
2515                 }
2516                 brt->brt_dst = bif;
2517                 bif->bif_addrcnt++;
2518         }
2519
2520         if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2521             brt->brt_dst != bif) {
2522                 brt->brt_dst->bif_addrcnt--;
2523                 brt->brt_dst = bif;
2524                 brt->brt_dst->bif_addrcnt++;
2525         }
2526
2527         if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2528                 brt->brt_expire = time_uptime + sc->sc_brttimeout;
2529         if (setflags)
2530                 brt->brt_flags = flags;
2531
2532         return (0);
2533 }
2534
2535 /*
2536  * bridge_rtlookup:
2537  *
2538  *      Lookup the destination interface for an address.
2539  */
2540 static struct ifnet *
2541 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2542 {
2543         struct bridge_rtnode *brt;
2544
2545         BRIDGE_LOCK_ASSERT(sc);
2546
2547         if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2548                 return (NULL);
2549
2550         return (brt->brt_ifp);
2551 }
2552
2553 /*
2554  * bridge_rttrim:
2555  *
2556  *      Trim the routine table so that we have a number
2557  *      of routing entries less than or equal to the
2558  *      maximum number.
2559  */
2560 static void
2561 bridge_rttrim(struct bridge_softc *sc)
2562 {
2563         struct bridge_rtnode *brt, *nbrt;
2564
2565         BRIDGE_LOCK_ASSERT(sc);
2566
2567         /* Make sure we actually need to do this. */
2568         if (sc->sc_brtcnt <= sc->sc_brtmax)
2569                 return;
2570
2571         /* Force an aging cycle; this might trim enough addresses. */
2572         bridge_rtage(sc);
2573         if (sc->sc_brtcnt <= sc->sc_brtmax)
2574                 return;
2575
2576         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2577                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2578                         bridge_rtnode_destroy(sc, brt);
2579                         if (sc->sc_brtcnt <= sc->sc_brtmax)
2580                                 return;
2581                 }
2582         }
2583 }
2584
2585 /*
2586  * bridge_timer:
2587  *
2588  *      Aging timer for the bridge.
2589  */
2590 static void
2591 bridge_timer(void *arg)
2592 {
2593         struct bridge_softc *sc = arg;
2594
2595         BRIDGE_LOCK_ASSERT(sc);
2596
2597         bridge_rtage(sc);
2598
2599         if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2600                 callout_reset(&sc->sc_brcallout,
2601                     bridge_rtable_prune_period * hz, bridge_timer, sc);
2602 }
2603
2604 /*
2605  * bridge_rtage:
2606  *
2607  *      Perform an aging cycle.
2608  */
2609 static void
2610 bridge_rtage(struct bridge_softc *sc)
2611 {
2612         struct bridge_rtnode *brt, *nbrt;
2613
2614         BRIDGE_LOCK_ASSERT(sc);
2615
2616         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2617                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2618                         if (time_uptime >= brt->brt_expire)
2619                                 bridge_rtnode_destroy(sc, brt);
2620                 }
2621         }
2622 }
2623
2624 /*
2625  * bridge_rtflush:
2626  *
2627  *      Remove all dynamic addresses from the bridge.
2628  */
2629 static void
2630 bridge_rtflush(struct bridge_softc *sc, int full)
2631 {
2632         struct bridge_rtnode *brt, *nbrt;
2633
2634         BRIDGE_LOCK_ASSERT(sc);
2635
2636         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2637                 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2638                         bridge_rtnode_destroy(sc, brt);
2639         }
2640 }
2641
2642 /*
2643  * bridge_rtdaddr:
2644  *
2645  *      Remove an address from the table.
2646  */
2647 static int
2648 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2649 {
2650         struct bridge_rtnode *brt;
2651         int found = 0;
2652
2653         BRIDGE_LOCK_ASSERT(sc);
2654
2655         /*
2656          * If vlan is zero then we want to delete for all vlans so the lookup
2657          * may return more than one.
2658          */
2659         while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
2660                 bridge_rtnode_destroy(sc, brt);
2661                 found = 1;
2662         }
2663
2664         return (found ? 0 : ENOENT);
2665 }
2666
2667 /*
2668  * bridge_rtdelete:
2669  *
2670  *      Delete routes to a speicifc member interface.
2671  */
2672 static void
2673 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2674 {
2675         struct bridge_rtnode *brt, *nbrt;
2676
2677         BRIDGE_LOCK_ASSERT(sc);
2678
2679         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2680                 if (brt->brt_ifp == ifp && (full ||
2681                             (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2682                         bridge_rtnode_destroy(sc, brt);
2683         }
2684 }
2685
2686 /*
2687  * bridge_rtable_init:
2688  *
2689  *      Initialize the route table for this bridge.
2690  */
2691 static int
2692 bridge_rtable_init(struct bridge_softc *sc)
2693 {
2694         int i;
2695
2696         sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
2697             M_DEVBUF, M_NOWAIT);
2698         if (sc->sc_rthash == NULL)
2699                 return (ENOMEM);
2700
2701         for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
2702                 LIST_INIT(&sc->sc_rthash[i]);
2703
2704         sc->sc_rthash_key = arc4random();
2705
2706         LIST_INIT(&sc->sc_rtlist);
2707
2708         return (0);
2709 }
2710
2711 /*
2712  * bridge_rtable_fini:
2713  *
2714  *      Deconstruct the route table for this bridge.
2715  */
2716 static void
2717 bridge_rtable_fini(struct bridge_softc *sc)
2718 {
2719
2720         KASSERT(sc->sc_brtcnt == 0,
2721             ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
2722         free(sc->sc_rthash, M_DEVBUF);
2723 }
2724
2725 /*
2726  * The following hash function is adapted from "Hash Functions" by Bob Jenkins
2727  * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
2728  */
2729 #define mix(a, b, c)                                                    \
2730 do {                                                                    \
2731         a -= b; a -= c; a ^= (c >> 13);                                 \
2732         b -= c; b -= a; b ^= (a << 8);                                  \
2733         c -= a; c -= b; c ^= (b >> 13);                                 \
2734         a -= b; a -= c; a ^= (c >> 12);                                 \
2735         b -= c; b -= a; b ^= (a << 16);                                 \
2736         c -= a; c -= b; c ^= (b >> 5);                                  \
2737         a -= b; a -= c; a ^= (c >> 3);                                  \
2738         b -= c; b -= a; b ^= (a << 10);                                 \
2739         c -= a; c -= b; c ^= (b >> 15);                                 \
2740 } while (/*CONSTCOND*/0)
2741
2742 static __inline uint32_t
2743 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
2744 {
2745         uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
2746
2747         b += addr[5] << 8;
2748         b += addr[4];
2749         a += addr[3] << 24;
2750         a += addr[2] << 16;
2751         a += addr[1] << 8;
2752         a += addr[0];
2753
2754         mix(a, b, c);
2755
2756         return (c & BRIDGE_RTHASH_MASK);
2757 }
2758
2759 #undef mix
2760
2761 static int
2762 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
2763 {
2764         int i, d;
2765
2766         for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
2767                 d = ((int)a[i]) - ((int)b[i]);
2768         }
2769
2770         return (d);
2771 }
2772
2773 /*
2774  * bridge_rtnode_lookup:
2775  *
2776  *      Look up a bridge route node for the specified destination. Compare the
2777  *      vlan id or if zero then just return the first match.
2778  */
2779 static struct bridge_rtnode *
2780 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2781 {
2782         struct bridge_rtnode *brt;
2783         uint32_t hash;
2784         int dir;
2785
2786         BRIDGE_LOCK_ASSERT(sc);
2787
2788         hash = bridge_rthash(sc, addr);
2789         LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
2790                 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
2791                 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
2792                         return (brt);
2793                 if (dir > 0)
2794                         return (NULL);
2795         }
2796
2797         return (NULL);
2798 }
2799
2800 /*
2801  * bridge_rtnode_insert:
2802  *
2803  *      Insert the specified bridge node into the route table.  We
2804  *      assume the entry is not already in the table.
2805  */
2806 static int
2807 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
2808 {
2809         struct bridge_rtnode *lbrt;
2810         uint32_t hash;
2811         int dir;
2812
2813         BRIDGE_LOCK_ASSERT(sc);
2814
2815         hash = bridge_rthash(sc, brt->brt_addr);
2816
2817         lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
2818         if (lbrt == NULL) {
2819                 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
2820                 goto out;
2821         }
2822
2823         do {
2824                 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
2825                 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
2826                         return (EEXIST);
2827                 if (dir > 0) {
2828                         LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
2829                         goto out;
2830                 }
2831                 if (LIST_NEXT(lbrt, brt_hash) == NULL) {
2832                         LIST_INSERT_AFTER(lbrt, brt, brt_hash);
2833                         goto out;
2834                 }
2835                 lbrt = LIST_NEXT(lbrt, brt_hash);
2836         } while (lbrt != NULL);
2837
2838 #ifdef DIAGNOSTIC
2839         panic("bridge_rtnode_insert: impossible");
2840 #endif
2841
2842 out:
2843         LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
2844         sc->sc_brtcnt++;
2845
2846         return (0);
2847 }
2848
2849 /*
2850  * bridge_rtnode_destroy:
2851  *
2852  *      Destroy a bridge rtnode.
2853  */
2854 static void
2855 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
2856 {
2857         BRIDGE_LOCK_ASSERT(sc);
2858
2859         LIST_REMOVE(brt, brt_hash);
2860
2861         LIST_REMOVE(brt, brt_list);
2862         sc->sc_brtcnt--;
2863         brt->brt_dst->bif_addrcnt--;
2864         uma_zfree(bridge_rtnode_zone, brt);
2865 }
2866
2867 /*
2868  * bridge_rtable_expire:
2869  *
2870  *      Set the expiry time for all routes on an interface.
2871  */
2872 static void
2873 bridge_rtable_expire(struct ifnet *ifp, int age)
2874 {
2875         struct bridge_softc *sc = ifp->if_bridge;
2876         struct bridge_rtnode *brt;
2877
2878         BRIDGE_LOCK(sc);
2879
2880         /*
2881          * If the age is zero then flush, otherwise set all the expiry times to
2882          * age for the interface
2883          */
2884         if (age == 0)
2885                 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
2886         else {
2887                 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
2888                         /* Cap the expiry time to 'age' */
2889                         if (brt->brt_ifp == ifp &&
2890                             brt->brt_expire > time_uptime + age &&
2891                             (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2892                                 brt->brt_expire = time_uptime + age;
2893                 }
2894         }
2895         BRIDGE_UNLOCK(sc);
2896 }
2897
2898 /*
2899  * bridge_state_change:
2900  *
2901  *      Callback from the bridgestp code when a port changes states.
2902  */
2903 static void
2904 bridge_state_change(struct ifnet *ifp, int state)
2905 {
2906         struct bridge_softc *sc = ifp->if_bridge;
2907         static const char *stpstates[] = {
2908                 "disabled",
2909                 "listening",
2910                 "learning",
2911                 "forwarding",
2912                 "blocking",
2913                 "discarding"
2914         };
2915
2916         if (log_stp)
2917                 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
2918                     sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
2919 }
2920
2921 /*
2922  * Send bridge packets through pfil if they are one of the types pfil can deal
2923  * with, or if they are ARP or REVARP.  (pfil will pass ARP and REVARP without
2924  * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
2925  * that interface.
2926  */
2927 static int
2928 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
2929 {
2930         int snap, error, i, hlen;
2931         struct ether_header *eh1, eh2;
2932         struct ip_fw_args args;
2933         struct ip *ip;
2934         struct llc llc1;
2935         u_int16_t ether_type;
2936
2937         snap = 0;
2938         error = -1;     /* Default error if not error == 0 */
2939
2940 #if 0
2941         /* we may return with the IP fields swapped, ensure its not shared */
2942         KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
2943 #endif
2944
2945         if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0)
2946                 return (0); /* filtering is disabled */
2947
2948         i = min((*mp)->m_pkthdr.len, max_protohdr);
2949         if ((*mp)->m_len < i) {
2950             *mp = m_pullup(*mp, i);
2951             if (*mp == NULL) {
2952                 printf("%s: m_pullup failed\n", __func__);
2953                 return (-1);
2954             }
2955         }
2956
2957         eh1 = mtod(*mp, struct ether_header *);
2958         ether_type = ntohs(eh1->ether_type);
2959
2960         /*
2961          * Check for SNAP/LLC.
2962          */
2963         if (ether_type < ETHERMTU) {
2964                 struct llc *llc2 = (struct llc *)(eh1 + 1);
2965
2966                 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
2967                     llc2->llc_dsap == LLC_SNAP_LSAP &&
2968                     llc2->llc_ssap == LLC_SNAP_LSAP &&
2969                     llc2->llc_control == LLC_UI) {
2970                         ether_type = htons(llc2->llc_un.type_snap.ether_type);
2971                         snap = 1;
2972                 }
2973         }
2974
2975         /*
2976          * If we're trying to filter bridge traffic, don't look at anything
2977          * other than IP and ARP traffic.  If the filter doesn't understand
2978          * IPv6, don't allow IPv6 through the bridge either.  This is lame
2979          * since if we really wanted, say, an AppleTalk filter, we are hosed,
2980          * but of course we don't have an AppleTalk filter to begin with.
2981          * (Note that since pfil doesn't understand ARP it will pass *ALL*
2982          * ARP traffic.)
2983          */
2984         switch (ether_type) {
2985                 case ETHERTYPE_ARP:
2986                 case ETHERTYPE_REVARP:
2987                         if (pfil_ipfw_arp == 0)
2988                                 return (0); /* Automatically pass */
2989                         break;
2990
2991                 case ETHERTYPE_IP:
2992 #ifdef INET6
2993                 case ETHERTYPE_IPV6:
2994 #endif /* INET6 */
2995                         break;
2996                 default:
2997                         /*
2998                          * Check to see if the user wants to pass non-ip
2999                          * packets, these will not be checked by pfil(9) and
3000                          * passed unconditionally so the default is to drop.
3001                          */
3002                         if (pfil_onlyip)
3003                                 goto bad;
3004         }
3005
3006         /* Strip off the Ethernet header and keep a copy. */
3007         m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3008         m_adj(*mp, ETHER_HDR_LEN);
3009
3010         /* Strip off snap header, if present */
3011         if (snap) {
3012                 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3013                 m_adj(*mp, sizeof(struct llc));
3014         }
3015
3016         /*
3017          * Check the IP header for alignment and errors
3018          */
3019         if (dir == PFIL_IN) {
3020                 switch (ether_type) {
3021                         case ETHERTYPE_IP:
3022                                 error = bridge_ip_checkbasic(mp);
3023                                 break;
3024 #ifdef INET6
3025                         case ETHERTYPE_IPV6:
3026                                 error = bridge_ip6_checkbasic(mp);
3027                                 break;
3028 #endif /* INET6 */
3029                         default:
3030                                 error = 0;
3031                 }
3032                 if (error)
3033                         goto bad;
3034         }
3035
3036         if (IPFW_LOADED && pfil_ipfw != 0 && dir == PFIL_OUT && ifp != NULL) {
3037                 error = -1;
3038                 args.rule = ip_dn_claim_rule(*mp);
3039                 if (args.rule != NULL && V_fw_one_pass)
3040                         goto ipfwpass; /* packet already partially processed */
3041
3042                 args.m = *mp;
3043                 args.oif = ifp;
3044                 args.next_hop = NULL;
3045                 args.eh = &eh2;
3046                 args.inp = NULL;        /* used by ipfw uid/gid/jail rules */
3047                 i = ip_fw_chk_ptr(&args);
3048                 *mp = args.m;
3049
3050                 if (*mp == NULL)
3051                         return (error);
3052
3053                 if (DUMMYNET_LOADED && (i == IP_FW_DUMMYNET)) {
3054
3055                         /* put the Ethernet header back on */
3056                         M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT);
3057                         if (*mp == NULL)
3058                                 return (error);
3059                         bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3060
3061                         /*
3062                          * Pass the pkt to dummynet, which consumes it. The
3063                          * packet will return to us via bridge_dummynet().
3064                          */
3065                         args.oif = ifp;
3066                         ip_dn_io_ptr(mp, DN_TO_IFB_FWD, &args);
3067                         return (error);
3068                 }
3069
3070                 if (i != IP_FW_PASS) /* drop */
3071                         goto bad;
3072         }
3073
3074 ipfwpass:
3075         error = 0;
3076
3077         /*
3078          * Run the packet through pfil
3079          */
3080         switch (ether_type) {
3081         case ETHERTYPE_IP:
3082                 /*
3083                  * before calling the firewall, swap fields the same as
3084                  * IP does. here we assume the header is contiguous
3085                  */
3086                 ip = mtod(*mp, struct ip *);
3087
3088                 ip->ip_len = ntohs(ip->ip_len);
3089                 ip->ip_off = ntohs(ip->ip_off);
3090
3091                 /*
3092                  * Run pfil on the member interface and the bridge, both can
3093                  * be skipped by clearing pfil_member or pfil_bridge.
3094                  *
3095                  * Keep the order:
3096                  *   in_if -> bridge_if -> out_if
3097                  */
3098                 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3099                         error = pfil_run_hooks(&inet_pfil_hook, mp, bifp,
3100                                         dir, NULL);
3101
3102                 if (*mp == NULL || error != 0) /* filter may consume */
3103                         break;
3104
3105                 if (pfil_member && ifp != NULL)
3106                         error = pfil_run_hooks(&inet_pfil_hook, mp, ifp,
3107                                         dir, NULL);
3108
3109                 if (*mp == NULL || error != 0) /* filter may consume */
3110                         break;
3111
3112                 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
3113                         error = pfil_run_hooks(&inet_pfil_hook, mp, bifp,
3114                                         dir, NULL);
3115
3116                 if (*mp == NULL || error != 0) /* filter may consume */
3117                         break;
3118
3119                 /* check if we need to fragment the packet */
3120                 if (pfil_member && ifp != NULL && dir == PFIL_OUT) {
3121                         i = (*mp)->m_pkthdr.len;
3122                         if (i > ifp->if_mtu) {
3123                                 error = bridge_fragment(ifp, *mp, &eh2, snap,
3124                                             &llc1);
3125                                 return (error);
3126                         }
3127                 }
3128
3129                 /* Recalculate the ip checksum and restore byte ordering */
3130                 ip = mtod(*mp, struct ip *);
3131                 hlen = ip->ip_hl << 2;
3132                 if (hlen < sizeof(struct ip))
3133                         goto bad;
3134                 if (hlen > (*mp)->m_len) {
3135                         if ((*mp = m_pullup(*mp, hlen)) == 0)
3136                                 goto bad;
3137                         ip = mtod(*mp, struct ip *);
3138                         if (ip == NULL)
3139                                 goto bad;
3140                 }
3141                 ip->ip_len = htons(ip->ip_len);
3142                 ip->ip_off = htons(ip->ip_off);
3143                 ip->ip_sum = 0;
3144                 if (hlen == sizeof(struct ip))
3145                         ip->ip_sum = in_cksum_hdr(ip);
3146                 else
3147                         ip->ip_sum = in_cksum(*mp, hlen);
3148
3149                 break;
3150 #ifdef INET6
3151         case ETHERTYPE_IPV6:
3152                 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3153                         error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp,
3154                                         dir, NULL);
3155
3156                 if (*mp == NULL || error != 0) /* filter may consume */
3157                         break;
3158
3159                 if (pfil_member && ifp != NULL)
3160                         error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp,
3161                                         dir, NULL);
3162
3163                 if (*mp == NULL || error != 0) /* filter may consume */
3164                         break;
3165
3166                 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
3167                         error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp,
3168                                         dir, NULL);
3169                 break;
3170 #endif
3171         default:
3172                 error = 0;
3173                 break;
3174         }
3175
3176         if (*mp == NULL)
3177                 return (error);
3178         if (error != 0)
3179                 goto bad;
3180
3181         error = -1;
3182
3183         /*
3184          * Finally, put everything back the way it was and return
3185          */
3186         if (snap) {
3187                 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT);
3188                 if (*mp == NULL)
3189                         return (error);
3190                 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3191         }
3192
3193         M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT);
3194         if (*mp == NULL)
3195                 return (error);
3196         bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3197
3198         return (0);
3199
3200 bad:
3201         m_freem(*mp);
3202         *mp = NULL;
3203         return (error);
3204 }
3205
3206 /*
3207  * Perform basic checks on header size since
3208  * pfil assumes ip_input has already processed
3209  * it for it.  Cut-and-pasted from ip_input.c.
3210  * Given how simple the IPv6 version is,
3211  * does the IPv4 version really need to be
3212  * this complicated?
3213  *
3214  * XXX Should we update ipstat here, or not?
3215  * XXX Right now we update ipstat but not
3216  * XXX csum_counter.
3217  */
3218 static int
3219 bridge_ip_checkbasic(struct mbuf **mp)
3220 {
3221         struct mbuf *m = *mp;
3222         struct ip *ip;
3223         int len, hlen;
3224         u_short sum;
3225
3226         if (*mp == NULL)
3227                 return (-1);
3228
3229         if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3230                 if ((m = m_copyup(m, sizeof(struct ip),
3231                         (max_linkhdr + 3) & ~3)) == NULL) {
3232                         /* XXXJRT new stat, please */
3233                         V_ipstat.ips_toosmall++;
3234                         goto bad;
3235                 }
3236         } else if (__predict_false(m->m_len < sizeof (struct ip))) {
3237                 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3238                         V_ipstat.ips_toosmall++;
3239                         goto bad;
3240                 }
3241         }
3242         ip = mtod(m, struct ip *);
3243         if (ip == NULL) goto bad;
3244
3245         if (ip->ip_v != IPVERSION) {
3246                 V_ipstat.ips_badvers++;
3247                 goto bad;
3248         }
3249         hlen = ip->ip_hl << 2;
3250         if (hlen < sizeof(struct ip)) { /* minimum header length */
3251                 V_ipstat.ips_badhlen++;
3252                 goto bad;
3253         }
3254         if (hlen > m->m_len) {
3255                 if ((m = m_pullup(m, hlen)) == 0) {
3256                         V_ipstat.ips_badhlen++;
3257                         goto bad;
3258                 }
3259                 ip = mtod(m, struct ip *);
3260                 if (ip == NULL) goto bad;
3261         }
3262
3263         if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3264                 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3265         } else {
3266                 if (hlen == sizeof(struct ip)) {
3267                         sum = in_cksum_hdr(ip);
3268                 } else {
3269                         sum = in_cksum(m, hlen);
3270                 }
3271         }
3272         if (sum) {
3273                 V_ipstat.ips_badsum++;
3274                 goto bad;
3275         }
3276
3277         /* Retrieve the packet length. */
3278         len = ntohs(ip->ip_len);
3279
3280         /*
3281          * Check for additional length bogosity
3282          */
3283         if (len < hlen) {
3284                 V_ipstat.ips_badlen++;
3285                 goto bad;
3286         }
3287
3288         /*
3289          * Check that the amount of data in the buffers
3290          * is as at least much as the IP header would have us expect.
3291          * Drop packet if shorter than we expect.
3292          */
3293         if (m->m_pkthdr.len < len) {
3294                 V_ipstat.ips_tooshort++;
3295                 goto bad;
3296         }
3297
3298         /* Checks out, proceed */
3299         *mp = m;
3300         return (0);
3301
3302 bad:
3303         *mp = m;
3304         return (-1);
3305 }
3306
3307 #ifdef INET6
3308 /*
3309  * Same as above, but for IPv6.
3310  * Cut-and-pasted from ip6_input.c.
3311  * XXX Should we update ip6stat, or not?
3312  */
3313 static int
3314 bridge_ip6_checkbasic(struct mbuf **mp)
3315 {
3316         struct mbuf *m = *mp;
3317         struct ip6_hdr *ip6;
3318
3319         /*
3320          * If the IPv6 header is not aligned, slurp it up into a new
3321          * mbuf with space for link headers, in the event we forward
3322          * it.  Otherwise, if it is aligned, make sure the entire base
3323          * IPv6 header is in the first mbuf of the chain.
3324          */
3325         if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3326                 struct ifnet *inifp = m->m_pkthdr.rcvif;
3327                 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3328                             (max_linkhdr + 3) & ~3)) == NULL) {
3329                         /* XXXJRT new stat, please */
3330                         V_ip6stat.ip6s_toosmall++;
3331                         in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3332                         goto bad;
3333                 }
3334         } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3335                 struct ifnet *inifp = m->m_pkthdr.rcvif;
3336                 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3337                         V_ip6stat.ip6s_toosmall++;
3338                         in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3339                         goto bad;
3340                 }
3341         }
3342
3343         ip6 = mtod(m, struct ip6_hdr *);
3344
3345         if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3346                 V_ip6stat.ip6s_badvers++;
3347                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3348                 goto bad;
3349         }
3350
3351         /* Checks out, proceed */
3352         *mp = m;
3353         return (0);
3354
3355 bad:
3356         *mp = m;
3357         return (-1);
3358 }
3359 #endif /* INET6 */
3360
3361 /*
3362  * bridge_fragment:
3363  *
3364  *      Return a fragmented mbuf chain.
3365  */
3366 static int
3367 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh,
3368     int snap, struct llc *llc)
3369 {
3370         struct mbuf *m0;
3371         struct ip *ip;
3372         int error = -1;
3373
3374         if (m->m_len < sizeof(struct ip) &&
3375             (m = m_pullup(m, sizeof(struct ip))) == NULL)
3376                 goto out;
3377         ip = mtod(m, struct ip *);
3378
3379         error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist,
3380                     CSUM_DELAY_IP);
3381         if (error)
3382                 goto out;
3383
3384         /* walk the chain and re-add the Ethernet header */
3385         for (m0 = m; m0; m0 = m0->m_nextpkt) {
3386                 if (error == 0) {
3387                         if (snap) {
3388                                 M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT);
3389                                 if (m0 == NULL) {
3390                                         error = ENOBUFS;
3391                                         continue;
3392                                 }
3393                                 bcopy(llc, mtod(m0, caddr_t),
3394                                     sizeof(struct llc));
3395                         }
3396                         M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT);
3397                         if (m0 == NULL) {
3398                                 error = ENOBUFS;
3399                                 continue;
3400                         }
3401                         bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN);
3402                 } else
3403                         m_freem(m);
3404         }
3405
3406         if (error == 0)
3407                 V_ipstat.ips_fragmented++;
3408
3409         return (error);
3410
3411 out:
3412         if (m != NULL)
3413                 m_freem(m);
3414         return (error);
3415 }