sys/net/if_bridge.c

   1 /*      $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $       */
   2
   3 /*-
   4  * SPDX-License-Identifier: BSD-4-Clause
   5  *
   6  * Copyright 2001 Wasabi Systems, Inc.
   7  * All rights reserved.
   8  *
   9  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed for the NetBSD Project by
  22  *      Wasabi Systems, Inc.
  23  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
  24  *    or promote products derived from this software without specific prior
  25  *    written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
  31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  37  * POSSIBILITY OF SUCH DAMAGE.
  38  */
  39
  40 /*
  41  * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net)
  42  * All rights reserved.
  43  *
  44  * Redistribution and use in source and binary forms, with or without
  45  * modification, are permitted provided that the following conditions
  46  * are met:
  47  * 1. Redistributions of source code must retain the above copyright
  48  *    notice, this list of conditions and the following disclaimer.
  49  * 2. Redistributions in binary form must reproduce the above copyright
  50  *    notice, this list of conditions and the following disclaimer in the
  51  *    documentation and/or other materials provided with the distribution.
  52  *
  53  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  54  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  55  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  56  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  57  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  58  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  59  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  60  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  61  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  62  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  63  * POSSIBILITY OF SUCH DAMAGE.
  64  *
  65  * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp
  66  */
  67
  68 /*
  69  * Network interface bridge support.
  70  *
  71  * TODO:
  72  *
  73  *      - Currently only supports Ethernet-like interfaces (Ethernet,
  74  *        802.11, VLANs on Ethernet, etc.)  Figure out a nice way
  75  *        to bridge other types of interfaces (maybe consider
  76  *        heterogeneous bridges).
  77  */
  78
  79 #include <sys/cdefs.h>
  80 __FBSDID("$FreeBSD$");
  81
  82 #include "opt_inet.h"
  83 #include "opt_inet6.h"
  84
  85 #include <sys/param.h>
  86 #include <sys/eventhandler.h>
  87 #include <sys/mbuf.h>
  88 #include <sys/malloc.h>
  89 #include <sys/protosw.h>
  90 #include <sys/systm.h>
  91 #include <sys/jail.h>
  92 #include <sys/time.h>
  93 #include <sys/socket.h> /* for net/if.h */
  94 #include <sys/sockio.h>
  95 #include <sys/ctype.h>  /* string functions */
  96 #include <sys/kernel.h>
  97 #include <sys/random.h>
  98 #include <sys/syslog.h>
  99 #include <sys/sysctl.h>
 100 #include <vm/uma.h>
 101 #include <sys/module.h>
 102 #include <sys/priv.h>
 103 #include <sys/proc.h>
 104 #include <sys/lock.h>
 105 #include <sys/mutex.h>
 106
 107 #include <net/bpf.h>
 108 #include <net/if.h>
 109 #include <net/if_clone.h>
 110 #include <net/if_dl.h>
 111 #include <net/if_types.h>
 112 #include <net/if_var.h>
 113 #include <net/pfil.h>
 114 #include <net/vnet.h>
 115
 116 #include <netinet/in.h>
 117 #include <netinet/in_systm.h>
 118 #include <netinet/in_var.h>
 119 #include <netinet/ip.h>
 120 #include <netinet/ip_var.h>
 121 #ifdef INET6
 122 #include <netinet/ip6.h>
 123 #include <netinet6/ip6_var.h>
 124 #include <netinet6/in6_ifattach.h>
 125 #endif
 126 #if defined(INET) || defined(INET6)
 127 #include <netinet/ip_carp.h>
 128 #endif
 129 #include <machine/in_cksum.h>
 130 #include <netinet/if_ether.h>
 131 #include <net/bridgestp.h>
 132 #include <net/if_bridgevar.h>
 133 #include <net/if_llc.h>
 134 #include <net/if_vlan_var.h>
 135
 136 #include <net/route.h>
 137
 138 #ifdef INET6
 139 /*
 140  * XXX: declare here to avoid to include many inet6 related files..
 141  * should be more generalized?
 142  */
 143 extern void     nd6_setmtu(struct ifnet *);
 144 #endif
 145
 146 /*
 147  * Size of the route hash table.  Must be a power of two.
 148  */
 149 #ifndef BRIDGE_RTHASH_SIZE
 150 #define BRIDGE_RTHASH_SIZE              1024
 151 #endif
 152
 153 #define BRIDGE_RTHASH_MASK              (BRIDGE_RTHASH_SIZE - 1)
 154
 155 /*
 156  * Default maximum number of addresses to cache.
 157  */
 158 #ifndef BRIDGE_RTABLE_MAX
 159 #define BRIDGE_RTABLE_MAX               2000
 160 #endif
 161
 162 /*
 163  * Timeout (in seconds) for entries learned dynamically.
 164  */
 165 #ifndef BRIDGE_RTABLE_TIMEOUT
 166 #define BRIDGE_RTABLE_TIMEOUT           (20 * 60)       /* same as ARP */
 167 #endif
 168
 169 /*
 170  * Number of seconds between walks of the route list.
 171  */
 172 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
 173 #define BRIDGE_RTABLE_PRUNE_PERIOD      (5 * 60)
 174 #endif
 175
 176 /*
 177  * List of capabilities to possibly mask on the member interface.
 178  */
 179 #define BRIDGE_IFCAPS_MASK              (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\
 180                                          IFCAP_TXCSUM_IPV6)
 181
 182 /*
 183  * List of capabilities to strip
 184  */
 185 #define BRIDGE_IFCAPS_STRIP             IFCAP_LRO
 186
 187 /*
 188  * Bridge locking
 189  */
 190 #define BRIDGE_LOCK_INIT(_sc)           do {                    \
 191         mtx_init(&(_sc)->sc_mtx, "if_bridge", NULL, MTX_DEF);   \
 192         cv_init(&(_sc)->sc_cv, "if_bridge_cv");                 \
 193 } while (0)
 194 #define BRIDGE_LOCK_DESTROY(_sc)        do {    \
 195         mtx_destroy(&(_sc)->sc_mtx);            \
 196         cv_destroy(&(_sc)->sc_cv);              \
 197 } while (0)
 198 #define BRIDGE_LOCK(_sc)                mtx_lock(&(_sc)->sc_mtx)
 199 #define BRIDGE_UNLOCK(_sc)              mtx_unlock(&(_sc)->sc_mtx)
 200 #define BRIDGE_LOCK_ASSERT(_sc)         mtx_assert(&(_sc)->sc_mtx, MA_OWNED)
 201 #define BRIDGE_UNLOCK_ASSERT(_sc)       mtx_assert(&(_sc)->sc_mtx, MA_NOTOWNED)
 202 #define BRIDGE_LOCK2REF(_sc, _err)      do {    \
 203         mtx_assert(&(_sc)->sc_mtx, MA_OWNED);   \
 204         if ((_sc)->sc_iflist_xcnt > 0)          \
 205                 (_err) = EBUSY;                 \
 206         else                                    \
 207                 (_sc)->sc_iflist_ref++;         \
 208         mtx_unlock(&(_sc)->sc_mtx);             \
 209 } while (0)
 210 #define BRIDGE_UNREF(_sc)               do {                            \
 211         mtx_lock(&(_sc)->sc_mtx);                                       \
 212         (_sc)->sc_iflist_ref--;                                         \
 213         if (((_sc)->sc_iflist_xcnt > 0) && ((_sc)->sc_iflist_ref == 0)) \
 214                 cv_broadcast(&(_sc)->sc_cv);                            \
 215         mtx_unlock(&(_sc)->sc_mtx);                                     \
 216 } while (0)
 217 #define BRIDGE_XLOCK(_sc)               do {            \
 218         mtx_assert(&(_sc)->sc_mtx, MA_OWNED);           \
 219         (_sc)->sc_iflist_xcnt++;                        \
 220         while ((_sc)->sc_iflist_ref > 0)                \
 221                 cv_wait(&(_sc)->sc_cv, &(_sc)->sc_mtx); \
 222 } while (0)
 223 #define BRIDGE_XDROP(_sc)               do {    \
 224         mtx_assert(&(_sc)->sc_mtx, MA_OWNED);   \
 225         (_sc)->sc_iflist_xcnt--;                \
 226 } while (0)
 227
 228 /*
 229  * Bridge interface list entry.
 230  */
 231 struct bridge_iflist {
 232         CK_LIST_ENTRY(bridge_iflist) bif_next;
 233         struct ifnet            *bif_ifp;       /* member if */
 234         struct bstp_port        bif_stp;        /* STP state */
 235         uint32_t                bif_flags;      /* member if flags */
 236         int                     bif_savedcaps;  /* saved capabilities */
 237         uint32_t                bif_addrmax;    /* max # of addresses */
 238         uint32_t                bif_addrcnt;    /* cur. # of addresses */
 239         uint32_t                bif_addrexceeded;/* # of address violations */
 240 };
 241
 242 /*
 243  * Bridge route node.
 244  */
 245 struct bridge_rtnode {
 246         CK_LIST_ENTRY(bridge_rtnode) brt_hash;  /* hash table linkage */
 247         CK_LIST_ENTRY(bridge_rtnode) brt_list;  /* list linkage */
 248         struct bridge_iflist    *brt_dst;       /* destination if */
 249         unsigned long           brt_expire;     /* expiration time */
 250         uint8_t                 brt_flags;      /* address flags */
 251         uint8_t                 brt_addr[ETHER_ADDR_LEN];
 252         uint16_t                brt_vlan;       /* vlan id */
 253 };
 254 #define brt_ifp                 brt_dst->bif_ifp
 255
 256 /*
 257  * Software state for each bridge.
 258  */
 259 struct bridge_softc {
 260         struct ifnet            *sc_ifp;        /* make this an interface */
 261         LIST_ENTRY(bridge_softc) sc_list;
 262         struct mtx              sc_mtx;
 263         struct cv               sc_cv;
 264         uint32_t                sc_brtmax;      /* max # of addresses */
 265         uint32_t                sc_brtcnt;      /* cur. # of addresses */
 266         uint32_t                sc_brttimeout;  /* rt timeout in seconds */
 267         struct callout          sc_brcallout;   /* bridge callout */
 268         uint32_t                sc_iflist_ref;  /* refcount for sc_iflist */
 269         uint32_t                sc_iflist_xcnt; /* refcount for sc_iflist */
 270         CK_LIST_HEAD(, bridge_iflist) sc_iflist;        /* member interface list */
 271         CK_LIST_HEAD(, bridge_rtnode) *sc_rthash;       /* our forwarding table */
 272         CK_LIST_HEAD(, bridge_rtnode) sc_rtlist;        /* list version of above */
 273         uint32_t                sc_rthash_key;  /* key for hash */
 274         CK_LIST_HEAD(, bridge_iflist) sc_spanlist;      /* span ports list */
 275         struct bstp_state       sc_stp;         /* STP state */
 276         uint32_t                sc_brtexceeded; /* # of cache drops */
 277         struct ifnet            *sc_ifaddr;     /* member mac copied from */
 278         struct ether_addr       sc_defaddr;     /* Default MAC address */
 279 };
 280
 281 VNET_DEFINE_STATIC(struct mtx, bridge_list_mtx);
 282 #define V_bridge_list_mtx       VNET(bridge_list_mtx)
 283 static eventhandler_tag bridge_detach_cookie;
 284
 285 int     bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
 286
 287 VNET_DEFINE_STATIC(uma_zone_t, bridge_rtnode_zone);
 288 #define V_bridge_rtnode_zone    VNET(bridge_rtnode_zone)
 289
 290 static int      bridge_clone_create(struct if_clone *, int, caddr_t);
 291 static void     bridge_clone_destroy(struct ifnet *);
 292
 293 static int      bridge_ioctl(struct ifnet *, u_long, caddr_t);
 294 static void     bridge_mutecaps(struct bridge_softc *);
 295 static void     bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
 296                     int);
 297 static void     bridge_ifdetach(void *arg __unused, struct ifnet *);
 298 static void     bridge_init(void *);
 299 static void     bridge_dummynet(struct mbuf *, struct ifnet *);
 300 static void     bridge_stop(struct ifnet *, int);
 301 static int      bridge_transmit(struct ifnet *, struct mbuf *);
 302 static void     bridge_qflush(struct ifnet *);
 303 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
 304 static int      bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
 305                     struct route *);
 306 static int      bridge_enqueue(struct bridge_softc *, struct ifnet *,
 307                     struct mbuf *);
 308 static void     bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
 309
 310 static void     bridge_forward(struct bridge_softc *, struct bridge_iflist *,
 311                     struct mbuf *m);
 312
 313 static void     bridge_timer(void *);
 314
 315 static void     bridge_broadcast(struct bridge_softc *, struct ifnet *,
 316                     struct mbuf *, int);
 317 static void     bridge_span(struct bridge_softc *, struct mbuf *);
 318
 319 static int      bridge_rtupdate(struct bridge_softc *, const uint8_t *,
 320                     uint16_t, struct bridge_iflist *, int, uint8_t);
 321 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
 322                     uint16_t);
 323 static void     bridge_rttrim(struct bridge_softc *);
 324 static void     bridge_rtage(struct bridge_softc *);
 325 static void     bridge_rtflush(struct bridge_softc *, int);
 326 static int      bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
 327                     uint16_t);
 328
 329 static void     bridge_rtable_init(struct bridge_softc *);
 330 static void     bridge_rtable_fini(struct bridge_softc *);
 331
 332 static int      bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
 333 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
 334                     const uint8_t *, uint16_t);
 335 static int      bridge_rtnode_insert(struct bridge_softc *,
 336                     struct bridge_rtnode *);
 337 static void     bridge_rtnode_destroy(struct bridge_softc *,
 338                     struct bridge_rtnode *);
 339 static void     bridge_rtable_expire(struct ifnet *, int);
 340 static void     bridge_state_change(struct ifnet *, int);
 341
 342 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
 343                     const char *name);
 344 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
 345                     struct ifnet *ifp);
 346 static void     bridge_delete_member(struct bridge_softc *,
 347                     struct bridge_iflist *, int);
 348 static void     bridge_delete_span(struct bridge_softc *,
 349                     struct bridge_iflist *);
 350
 351 static int      bridge_ioctl_add(struct bridge_softc *, void *);
 352 static int      bridge_ioctl_del(struct bridge_softc *, void *);
 353 static int      bridge_ioctl_gifflags(struct bridge_softc *, void *);
 354 static int      bridge_ioctl_sifflags(struct bridge_softc *, void *);
 355 static int      bridge_ioctl_scache(struct bridge_softc *, void *);
 356 static int      bridge_ioctl_gcache(struct bridge_softc *, void *);
 357 static int      bridge_ioctl_gifs(struct bridge_softc *, void *);
 358 static int      bridge_ioctl_rts(struct bridge_softc *, void *);
 359 static int      bridge_ioctl_saddr(struct bridge_softc *, void *);
 360 static int      bridge_ioctl_sto(struct bridge_softc *, void *);
 361 static int      bridge_ioctl_gto(struct bridge_softc *, void *);
 362 static int      bridge_ioctl_daddr(struct bridge_softc *, void *);
 363 static int      bridge_ioctl_flush(struct bridge_softc *, void *);
 364 static int      bridge_ioctl_gpri(struct bridge_softc *, void *);
 365 static int      bridge_ioctl_spri(struct bridge_softc *, void *);
 366 static int      bridge_ioctl_ght(struct bridge_softc *, void *);
 367 static int      bridge_ioctl_sht(struct bridge_softc *, void *);
 368 static int      bridge_ioctl_gfd(struct bridge_softc *, void *);
 369 static int      bridge_ioctl_sfd(struct bridge_softc *, void *);
 370 static int      bridge_ioctl_gma(struct bridge_softc *, void *);
 371 static int      bridge_ioctl_sma(struct bridge_softc *, void *);
 372 static int      bridge_ioctl_sifprio(struct bridge_softc *, void *);
 373 static int      bridge_ioctl_sifcost(struct bridge_softc *, void *);
 374 static int      bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
 375 static int      bridge_ioctl_addspan(struct bridge_softc *, void *);
 376 static int      bridge_ioctl_delspan(struct bridge_softc *, void *);
 377 static int      bridge_ioctl_gbparam(struct bridge_softc *, void *);
 378 static int      bridge_ioctl_grte(struct bridge_softc *, void *);
 379 static int      bridge_ioctl_gifsstp(struct bridge_softc *, void *);
 380 static int      bridge_ioctl_sproto(struct bridge_softc *, void *);
 381 static int      bridge_ioctl_stxhc(struct bridge_softc *, void *);
 382 static int      bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
 383                     int);
 384 static int      bridge_ip_checkbasic(struct mbuf **mp);
 385 #ifdef INET6
 386 static int      bridge_ip6_checkbasic(struct mbuf **mp);
 387 #endif /* INET6 */
 388 static int      bridge_fragment(struct ifnet *, struct mbuf **mp,
 389                     struct ether_header *, int, struct llc *);
 390 static void     bridge_linkstate(struct ifnet *ifp);
 391 static void     bridge_linkcheck(struct bridge_softc *sc);
 392
 393
 394 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
 395 #define VLANTAGOF(_m)   \
 396     (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
 397
 398 static struct bstp_cb_ops bridge_ops = {
 399         .bcb_state = bridge_state_change,
 400         .bcb_rtage = bridge_rtable_expire
 401 };
 402
 403 SYSCTL_DECL(_net_link);
 404 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
 405     "Bridge");
 406
 407 /* only pass IP[46] packets when pfil is enabled */
 408 VNET_DEFINE_STATIC(int, pfil_onlyip) = 1;
 409 #define V_pfil_onlyip   VNET(pfil_onlyip)
 410 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip,
 411     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0,
 412     "Only pass IP packets when pfil is enabled");
 413
 414 /* run pfil hooks on the bridge interface */
 415 VNET_DEFINE_STATIC(int, pfil_bridge) = 1;
 416 #define V_pfil_bridge   VNET(pfil_bridge)
 417 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge,
 418     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0,
 419     "Packet filter on the bridge interface");
 420
 421 /* layer2 filter with ipfw */
 422 VNET_DEFINE_STATIC(int, pfil_ipfw);
 423 #define V_pfil_ipfw     VNET(pfil_ipfw)
 424
 425 /* layer2 ARP filter with ipfw */
 426 VNET_DEFINE_STATIC(int, pfil_ipfw_arp);
 427 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp)
 428 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp,
 429     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0,
 430     "Filter ARP packets through IPFW layer2");
 431
 432 /* run pfil hooks on the member interface */
 433 VNET_DEFINE_STATIC(int, pfil_member) = 1;
 434 #define V_pfil_member   VNET(pfil_member)
 435 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member,
 436     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0,
 437     "Packet filter on the member interface");
 438
 439 /* run pfil hooks on the physical interface for locally destined packets */
 440 VNET_DEFINE_STATIC(int, pfil_local_phys);
 441 #define V_pfil_local_phys       VNET(pfil_local_phys)
 442 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys,
 443     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0,
 444     "Packet filter on the physical interface for locally destined packets");
 445
 446 /* log STP state changes */
 447 VNET_DEFINE_STATIC(int, log_stp);
 448 #define V_log_stp       VNET(log_stp)
 449 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp,
 450     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0,
 451     "Log STP state changes");
 452
 453 /* share MAC with first bridge member */
 454 VNET_DEFINE_STATIC(int, bridge_inherit_mac);
 455 #define V_bridge_inherit_mac    VNET(bridge_inherit_mac)
 456 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac,
 457     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0,
 458     "Inherit MAC address from the first bridge member");
 459
 460 VNET_DEFINE_STATIC(int, allow_llz_overlap) = 0;
 461 #define V_allow_llz_overlap     VNET(allow_llz_overlap)
 462 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap,
 463     CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0,
 464     "Allow overlap of link-local scope "
 465     "zones of a bridge interface and the member interfaces");
 466
 467 struct bridge_control {
 468         int     (*bc_func)(struct bridge_softc *, void *);
 469         int     bc_argsize;
 470         int     bc_flags;
 471 };
 472
 473 #define BC_F_COPYIN             0x01    /* copy arguments in */
 474 #define BC_F_COPYOUT            0x02    /* copy arguments out */
 475 #define BC_F_SUSER              0x04    /* do super-user check */
 476
 477 const struct bridge_control bridge_control_table[] = {
 478         { bridge_ioctl_add,             sizeof(struct ifbreq),
 479           BC_F_COPYIN|BC_F_SUSER },
 480         { bridge_ioctl_del,             sizeof(struct ifbreq),
 481           BC_F_COPYIN|BC_F_SUSER },
 482
 483         { bridge_ioctl_gifflags,        sizeof(struct ifbreq),
 484           BC_F_COPYIN|BC_F_COPYOUT },
 485         { bridge_ioctl_sifflags,        sizeof(struct ifbreq),
 486           BC_F_COPYIN|BC_F_SUSER },
 487
 488         { bridge_ioctl_scache,          sizeof(struct ifbrparam),
 489           BC_F_COPYIN|BC_F_SUSER },
 490         { bridge_ioctl_gcache,          sizeof(struct ifbrparam),
 491           BC_F_COPYOUT },
 492
 493         { bridge_ioctl_gifs,            sizeof(struct ifbifconf),
 494           BC_F_COPYIN|BC_F_COPYOUT },
 495         { bridge_ioctl_rts,             sizeof(struct ifbaconf),
 496           BC_F_COPYIN|BC_F_COPYOUT },
 497
 498         { bridge_ioctl_saddr,           sizeof(struct ifbareq),
 499           BC_F_COPYIN|BC_F_SUSER },
 500
 501         { bridge_ioctl_sto,             sizeof(struct ifbrparam),
 502           BC_F_COPYIN|BC_F_SUSER },
 503         { bridge_ioctl_gto,             sizeof(struct ifbrparam),
 504           BC_F_COPYOUT },
 505
 506         { bridge_ioctl_daddr,           sizeof(struct ifbareq),
 507           BC_F_COPYIN|BC_F_SUSER },
 508
 509         { bridge_ioctl_flush,           sizeof(struct ifbreq),
 510           BC_F_COPYIN|BC_F_SUSER },
 511
 512         { bridge_ioctl_gpri,            sizeof(struct ifbrparam),
 513           BC_F_COPYOUT },
 514         { bridge_ioctl_spri,            sizeof(struct ifbrparam),
 515           BC_F_COPYIN|BC_F_SUSER },
 516
 517         { bridge_ioctl_ght,             sizeof(struct ifbrparam),
 518           BC_F_COPYOUT },
 519         { bridge_ioctl_sht,             sizeof(struct ifbrparam),
 520           BC_F_COPYIN|BC_F_SUSER },
 521
 522         { bridge_ioctl_gfd,             sizeof(struct ifbrparam),
 523           BC_F_COPYOUT },
 524         { bridge_ioctl_sfd,             sizeof(struct ifbrparam),
 525           BC_F_COPYIN|BC_F_SUSER },
 526
 527         { bridge_ioctl_gma,             sizeof(struct ifbrparam),
 528           BC_F_COPYOUT },
 529         { bridge_ioctl_sma,             sizeof(struct ifbrparam),
 530           BC_F_COPYIN|BC_F_SUSER },
 531
 532         { bridge_ioctl_sifprio,         sizeof(struct ifbreq),
 533           BC_F_COPYIN|BC_F_SUSER },
 534
 535         { bridge_ioctl_sifcost,         sizeof(struct ifbreq),
 536           BC_F_COPYIN|BC_F_SUSER },
 537
 538         { bridge_ioctl_addspan,         sizeof(struct ifbreq),
 539           BC_F_COPYIN|BC_F_SUSER },
 540         { bridge_ioctl_delspan,         sizeof(struct ifbreq),
 541           BC_F_COPYIN|BC_F_SUSER },
 542
 543         { bridge_ioctl_gbparam,         sizeof(struct ifbropreq),
 544           BC_F_COPYOUT },
 545
 546         { bridge_ioctl_grte,            sizeof(struct ifbrparam),
 547           BC_F_COPYOUT },
 548
 549         { bridge_ioctl_gifsstp,         sizeof(struct ifbpstpconf),
 550           BC_F_COPYIN|BC_F_COPYOUT },
 551
 552         { bridge_ioctl_sproto,          sizeof(struct ifbrparam),
 553           BC_F_COPYIN|BC_F_SUSER },
 554
 555         { bridge_ioctl_stxhc,           sizeof(struct ifbrparam),
 556           BC_F_COPYIN|BC_F_SUSER },
 557
 558         { bridge_ioctl_sifmaxaddr,      sizeof(struct ifbreq),
 559           BC_F_COPYIN|BC_F_SUSER },
 560
 561 };
 562 const int bridge_control_table_size = nitems(bridge_control_table);
 563
 564 VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list);
 565 #define V_bridge_list   VNET(bridge_list)
 566 #define BRIDGE_LIST_LOCK_INIT(x)        mtx_init(&V_bridge_list_mtx,    \
 567                                             "if_bridge list", NULL, MTX_DEF)
 568 #define BRIDGE_LIST_LOCK_DESTROY(x)     mtx_destroy(&V_bridge_list_mtx)
 569 #define BRIDGE_LIST_LOCK(x)             mtx_lock(&V_bridge_list_mtx)
 570 #define BRIDGE_LIST_UNLOCK(x)           mtx_unlock(&V_bridge_list_mtx)
 571
 572 VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner);
 573 #define V_bridge_cloner VNET(bridge_cloner)
 574
 575 static const char bridge_name[] = "bridge";
 576
 577 static void
 578 vnet_bridge_init(const void *unused __unused)
 579 {
 580
 581         V_bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
 582             sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
 583             UMA_ALIGN_PTR, 0);
 584         BRIDGE_LIST_LOCK_INIT();
 585         LIST_INIT(&V_bridge_list);
 586         V_bridge_cloner = if_clone_simple(bridge_name,
 587             bridge_clone_create, bridge_clone_destroy, 0);
 588 }
 589 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
 590     vnet_bridge_init, NULL);
 591
 592 static void
 593 vnet_bridge_uninit(const void *unused __unused)
 594 {
 595
 596         if_clone_detach(V_bridge_cloner);
 597         V_bridge_cloner = NULL;
 598         BRIDGE_LIST_LOCK_DESTROY();
 599         uma_zdestroy(V_bridge_rtnode_zone);
 600 }
 601 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
 602     vnet_bridge_uninit, NULL);
 603
 604 static int
 605 bridge_modevent(module_t mod, int type, void *data)
 606 {
 607
 608         switch (type) {
 609         case MOD_LOAD:
 610                 bridge_dn_p = bridge_dummynet;
 611                 bridge_detach_cookie = EVENTHANDLER_REGISTER(
 612                     ifnet_departure_event, bridge_ifdetach, NULL,
 613                     EVENTHANDLER_PRI_ANY);
 614                 break;
 615         case MOD_UNLOAD:
 616                 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
 617                     bridge_detach_cookie);
 618                 bridge_dn_p = NULL;
 619                 break;
 620         default:
 621                 return (EOPNOTSUPP);
 622         }
 623         return (0);
 624 }
 625
 626 static moduledata_t bridge_mod = {
 627         "if_bridge",
 628         bridge_modevent,
 629         0
 630 };
 631
 632 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
 633 MODULE_VERSION(if_bridge, 1);
 634 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
 635
 636 /*
 637  * handler for net.link.bridge.ipfw
 638  */
 639 static int
 640 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
 641 {
 642         int enable = V_pfil_ipfw;
 643         int error;
 644
 645         error = sysctl_handle_int(oidp, &enable, 0, req);
 646         enable &= 1;
 647
 648         if (enable != V_pfil_ipfw) {
 649                 V_pfil_ipfw = enable;
 650
 651                 /*
 652                  * Disable pfil so that ipfw doesnt run twice, if the user
 653                  * really wants both then they can re-enable pfil_bridge and/or
 654                  * pfil_member. Also allow non-ip packets as ipfw can filter by
 655                  * layer2 type.
 656                  */
 657                 if (V_pfil_ipfw) {
 658                         V_pfil_onlyip = 0;
 659                         V_pfil_bridge = 0;
 660                         V_pfil_member = 0;
 661                 }
 662         }
 663
 664         return (error);
 665 }
 666 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw,
 667     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET | CTLFLAG_NEEDGIANT,
 668     &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I",
 669     "Layer2 filter with IPFW");
 670
 671 /*
 672  * bridge_clone_create:
 673  *
 674  *      Create a new bridge instance.
 675  */
 676 static int
 677 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
 678 {
 679         struct bridge_softc *sc, *sc2;
 680         struct ifnet *bifp, *ifp;
 681         int fb, retry;
 682         unsigned long hostid;
 683
 684         sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
 685         ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
 686         if (ifp == NULL) {
 687                 free(sc, M_DEVBUF);
 688                 return (ENOSPC);
 689         }
 690
 691         BRIDGE_LOCK_INIT(sc);
 692         sc->sc_brtmax = BRIDGE_RTABLE_MAX;
 693         sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
 694
 695         /* Initialize our routing table. */
 696         bridge_rtable_init(sc);
 697
 698         callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
 699
 700         CK_LIST_INIT(&sc->sc_iflist);
 701         CK_LIST_INIT(&sc->sc_spanlist);
 702
 703         ifp->if_softc = sc;
 704         if_initname(ifp, bridge_name, unit);
 705         ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
 706         ifp->if_ioctl = bridge_ioctl;
 707         ifp->if_transmit = bridge_transmit;
 708         ifp->if_qflush = bridge_qflush;
 709         ifp->if_init = bridge_init;
 710         ifp->if_type = IFT_BRIDGE;
 711
 712         /*
 713          * Generate an ethernet address with a locally administered address.
 714          *
 715          * Since we are using random ethernet addresses for the bridge, it is
 716          * possible that we might have address collisions, so make sure that
 717          * this hardware address isn't already in use on another bridge.
 718          * The first try uses the hostid and falls back to arc4rand().
 719          */
 720         fb = 0;
 721         getcredhostid(curthread->td_ucred, &hostid);
 722         do {
 723                 if (fb || hostid == 0) {
 724                         ether_gen_addr(ifp, &sc->sc_defaddr);
 725                 } else {
 726                         sc->sc_defaddr.octet[0] = 0x2;
 727                         sc->sc_defaddr.octet[1] = (hostid >> 24) & 0xff;
 728                         sc->sc_defaddr.octet[2] = (hostid >> 16) & 0xff;
 729                         sc->sc_defaddr.octet[3] = (hostid >> 8 ) & 0xff;
 730                         sc->sc_defaddr.octet[4] =  hostid        & 0xff;
 731                         sc->sc_defaddr.octet[5] = ifp->if_dunit & 0xff;
 732                 }
 733
 734                 fb = 1;
 735                 retry = 0;
 736                 BRIDGE_LIST_LOCK();
 737                 LIST_FOREACH(sc2, &V_bridge_list, sc_list) {
 738                         bifp = sc2->sc_ifp;
 739                         if (memcmp(sc->sc_defaddr.octet,
 740                             IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) {
 741                                 retry = 1;
 742                                 break;
 743                         }
 744                 }
 745                 BRIDGE_LIST_UNLOCK();
 746         } while (retry == 1);
 747
 748         bstp_attach(&sc->sc_stp, &bridge_ops);
 749         ether_ifattach(ifp, sc->sc_defaddr.octet);
 750         /* Now undo some of the damage... */
 751         ifp->if_baudrate = 0;
 752         ifp->if_type = IFT_BRIDGE;
 753
 754         BRIDGE_LIST_LOCK();
 755         LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list);
 756         BRIDGE_LIST_UNLOCK();
 757
 758         return (0);
 759 }
 760
 761 /*
 762  * bridge_clone_destroy:
 763  *
 764  *      Destroy a bridge instance.
 765  */
 766 static void
 767 bridge_clone_destroy(struct ifnet *ifp)
 768 {
 769         struct bridge_softc *sc = ifp->if_softc;
 770         struct bridge_iflist *bif;
 771
 772         BRIDGE_LOCK(sc);
 773
 774         bridge_stop(ifp, 1);
 775         ifp->if_flags &= ~IFF_UP;
 776
 777         while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL)
 778                 bridge_delete_member(sc, bif, 0);
 779
 780         while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) {
 781                 bridge_delete_span(sc, bif);
 782         }
 783
 784         /* Tear down the routing table. */
 785         bridge_rtable_fini(sc);
 786
 787         BRIDGE_UNLOCK(sc);
 788
 789         callout_drain(&sc->sc_brcallout);
 790
 791         BRIDGE_LIST_LOCK();
 792         LIST_REMOVE(sc, sc_list);
 793         BRIDGE_LIST_UNLOCK();
 794
 795         bstp_detach(&sc->sc_stp);
 796         ether_ifdetach(ifp);
 797         if_free(ifp);
 798
 799         BRIDGE_LOCK_DESTROY(sc);
 800         free(sc, M_DEVBUF);
 801 }
 802
 803 /*
 804  * bridge_ioctl:
 805  *
 806  *      Handle a control request from the operator.
 807  */
 808 static int
 809 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
 810 {
 811         struct bridge_softc *sc = ifp->if_softc;
 812         struct ifreq *ifr = (struct ifreq *)data;
 813         struct bridge_iflist *bif;
 814         struct thread *td = curthread;
 815         union {
 816                 struct ifbreq ifbreq;
 817                 struct ifbifconf ifbifconf;
 818                 struct ifbareq ifbareq;
 819                 struct ifbaconf ifbaconf;
 820                 struct ifbrparam ifbrparam;
 821                 struct ifbropreq ifbropreq;
 822         } args;
 823         struct ifdrv *ifd = (struct ifdrv *) data;
 824         const struct bridge_control *bc;
 825         int error = 0, oldmtu;
 826
 827         switch (cmd) {
 828
 829         case SIOCADDMULTI:
 830         case SIOCDELMULTI:
 831                 break;
 832
 833         case SIOCGDRVSPEC:
 834         case SIOCSDRVSPEC:
 835                 if (ifd->ifd_cmd >= bridge_control_table_size) {
 836                         error = EINVAL;
 837                         break;
 838                 }
 839                 bc = &bridge_control_table[ifd->ifd_cmd];
 840
 841                 if (cmd == SIOCGDRVSPEC &&
 842                     (bc->bc_flags & BC_F_COPYOUT) == 0) {
 843                         error = EINVAL;
 844                         break;
 845                 }
 846                 else if (cmd == SIOCSDRVSPEC &&
 847                     (bc->bc_flags & BC_F_COPYOUT) != 0) {
 848                         error = EINVAL;
 849                         break;
 850                 }
 851
 852                 if (bc->bc_flags & BC_F_SUSER) {
 853                         error = priv_check(td, PRIV_NET_BRIDGE);
 854                         if (error)
 855                                 break;
 856                 }
 857
 858                 if (ifd->ifd_len != bc->bc_argsize ||
 859                     ifd->ifd_len > sizeof(args)) {
 860                         error = EINVAL;
 861                         break;
 862                 }
 863
 864                 bzero(&args, sizeof(args));
 865                 if (bc->bc_flags & BC_F_COPYIN) {
 866                         error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
 867                         if (error)
 868                                 break;
 869                 }
 870
 871                 oldmtu = ifp->if_mtu;
 872                 BRIDGE_LOCK(sc);
 873                 error = (*bc->bc_func)(sc, &args);
 874                 BRIDGE_UNLOCK(sc);
 875                 if (error)
 876                         break;
 877
 878                 /*
 879                  * Bridge MTU may change during addition of the first port.
 880                  * If it did, do network layer specific procedure.
 881                  */
 882                 if (ifp->if_mtu != oldmtu) {
 883 #ifdef INET6
 884                         nd6_setmtu(ifp);
 885 #endif
 886                         rt_updatemtu(ifp);
 887                 }
 888
 889                 if (bc->bc_flags & BC_F_COPYOUT)
 890                         error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
 891
 892                 break;
 893
 894         case SIOCSIFFLAGS:
 895                 if (!(ifp->if_flags & IFF_UP) &&
 896                     (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 897                         /*
 898                          * If interface is marked down and it is running,
 899                          * then stop and disable it.
 900                          */
 901                         BRIDGE_LOCK(sc);
 902                         bridge_stop(ifp, 1);
 903                         BRIDGE_UNLOCK(sc);
 904                 } else if ((ifp->if_flags & IFF_UP) &&
 905                     !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 906                         /*
 907                          * If interface is marked up and it is stopped, then
 908                          * start it.
 909                          */
 910                         (*ifp->if_init)(sc);
 911                 }
 912                 break;
 913
 914         case SIOCSIFMTU:
 915                 if (ifr->ifr_mtu < 576) {
 916                         error = EINVAL;
 917                         break;
 918                 }
 919                 if (CK_LIST_EMPTY(&sc->sc_iflist)) {
 920                         sc->sc_ifp->if_mtu = ifr->ifr_mtu;
 921                         break;
 922                 }
 923                 BRIDGE_LOCK(sc);
 924                 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 925                         if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) {
 926                                 log(LOG_NOTICE, "%s: invalid MTU: %u(%s)"
 927                                     " != %d\n", sc->sc_ifp->if_xname,
 928                                     bif->bif_ifp->if_mtu,
 929                                     bif->bif_ifp->if_xname, ifr->ifr_mtu);
 930                                 error = EINVAL;
 931                                 break;
 932                         }
 933                 }
 934                 if (!error)
 935                         sc->sc_ifp->if_mtu = ifr->ifr_mtu;
 936                 BRIDGE_UNLOCK(sc);
 937                 break;
 938         default:
 939                 /*
 940                  * drop the lock as ether_ioctl() will call bridge_start() and
 941                  * cause the lock to be recursed.
 942                  */
 943                 error = ether_ioctl(ifp, cmd, data);
 944                 break;
 945         }
 946
 947         return (error);
 948 }
 949
 950 /*
 951  * bridge_mutecaps:
 952  *
 953  *      Clear or restore unwanted capabilities on the member interface
 954  */
 955 static void
 956 bridge_mutecaps(struct bridge_softc *sc)
 957 {
 958         struct bridge_iflist *bif;
 959         int enabled, mask;
 960
 961         /* Initial bitmask of capabilities to test */
 962         mask = BRIDGE_IFCAPS_MASK;
 963
 964         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 965                 /* Every member must support it or its disabled */
 966                 mask &= bif->bif_savedcaps;
 967         }
 968
 969         BRIDGE_XLOCK(sc);
 970         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 971                 enabled = bif->bif_ifp->if_capenable;
 972                 enabled &= ~BRIDGE_IFCAPS_STRIP;
 973                 /* strip off mask bits and enable them again if allowed */
 974                 enabled &= ~BRIDGE_IFCAPS_MASK;
 975                 enabled |= mask;
 976                 BRIDGE_UNLOCK(sc);
 977                 bridge_set_ifcap(sc, bif, enabled);
 978                 BRIDGE_LOCK(sc);
 979         }
 980         BRIDGE_XDROP(sc);
 981
 982 }
 983
 984 static void
 985 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
 986 {
 987         struct ifnet *ifp = bif->bif_ifp;
 988         struct ifreq ifr;
 989         int error, mask, stuck;
 990
 991         BRIDGE_UNLOCK_ASSERT(sc);
 992
 993         bzero(&ifr, sizeof(ifr));
 994         ifr.ifr_reqcap = set;
 995
 996         if (ifp->if_capenable != set) {
 997                 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
 998                 if (error)
 999                         if_printf(sc->sc_ifp,
1000                             "error setting capabilities on %s: %d\n",
1001                             ifp->if_xname, error);
1002                 mask = BRIDGE_IFCAPS_MASK | BRIDGE_IFCAPS_STRIP;
1003                 stuck = ifp->if_capenable & mask & ~set;
1004                 if (stuck != 0)
1005                         if_printf(sc->sc_ifp,
1006                             "can't disable some capabilities on %s: 0x%x\n",
1007                             ifp->if_xname, stuck);
1008         }
1009 }
1010
1011 /*
1012  * bridge_lookup_member:
1013  *
1014  *      Lookup a bridge member interface.
1015  */
1016 static struct bridge_iflist *
1017 bridge_lookup_member(struct bridge_softc *sc, const char *name)
1018 {
1019         struct bridge_iflist *bif;
1020         struct ifnet *ifp;
1021
1022         BRIDGE_LOCK_ASSERT(sc);
1023
1024         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1025                 ifp = bif->bif_ifp;
1026                 if (strcmp(ifp->if_xname, name) == 0)
1027                         return (bif);
1028         }
1029
1030         return (NULL);
1031 }
1032
1033 /*
1034  * bridge_lookup_member_if:
1035  *
1036  *      Lookup a bridge member interface by ifnet*.
1037  */
1038 static struct bridge_iflist *
1039 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
1040 {
1041         struct bridge_iflist *bif;
1042
1043         BRIDGE_LOCK_ASSERT(sc);
1044
1045         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1046                 if (bif->bif_ifp == member_ifp)
1047                         return (bif);
1048         }
1049
1050         return (NULL);
1051 }
1052
1053 /*
1054  * bridge_delete_member:
1055  *
1056  *      Delete the specified member interface.
1057  */
1058 static void
1059 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
1060     int gone)
1061 {
1062         struct ifnet *ifs = bif->bif_ifp;
1063         struct ifnet *fif = NULL;
1064         struct bridge_iflist *bifl;
1065
1066         BRIDGE_LOCK_ASSERT(sc);
1067
1068         if (bif->bif_flags & IFBIF_STP)
1069                 bstp_disable(&bif->bif_stp);
1070
1071         ifs->if_bridge = NULL;
1072         BRIDGE_XLOCK(sc);
1073         CK_LIST_REMOVE(bif, bif_next);
1074         BRIDGE_XDROP(sc);
1075
1076         /*
1077          * If removing the interface that gave the bridge its mac address, set
1078          * the mac address of the bridge to the address of the next member, or
1079          * to its default address if no members are left.
1080          */
1081         if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) {
1082                 if (CK_LIST_EMPTY(&sc->sc_iflist)) {
1083                         bcopy(&sc->sc_defaddr,
1084                             IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1085                         sc->sc_ifaddr = NULL;
1086                 } else {
1087                         bifl = CK_LIST_FIRST(&sc->sc_iflist);
1088                         fif = bifl->bif_ifp;
1089                         bcopy(IF_LLADDR(fif),
1090                             IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1091                         sc->sc_ifaddr = fif;
1092                 }
1093                 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1094         }
1095
1096         bridge_linkcheck(sc);
1097         bridge_mutecaps(sc);    /* recalcuate now this interface is removed */
1098         bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
1099         KASSERT(bif->bif_addrcnt == 0,
1100             ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
1101
1102         ifs->if_bridge_output = NULL;
1103         ifs->if_bridge_input = NULL;
1104         ifs->if_bridge_linkstate = NULL;
1105         BRIDGE_UNLOCK(sc);
1106         if (!gone) {
1107                 switch (ifs->if_type) {
1108                 case IFT_ETHER:
1109                 case IFT_L2VLAN:
1110                         /*
1111                          * Take the interface out of promiscuous mode, but only
1112                          * if it was promiscuous in the first place. It might
1113                          * not be if we're in the bridge_ioctl_add() error path.
1114                          */
1115                         if (ifs->if_flags & IFF_PROMISC)
1116                                 (void) ifpromisc(ifs, 0);
1117                         break;
1118
1119                 case IFT_GIF:
1120                         break;
1121
1122                 default:
1123 #ifdef DIAGNOSTIC
1124                         panic("bridge_delete_member: impossible");
1125 #endif
1126                         break;
1127                 }
1128                 /* reneable any interface capabilities */
1129                 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
1130         }
1131         bstp_destroy(&bif->bif_stp);    /* prepare to free */
1132         BRIDGE_LOCK(sc);
1133         free(bif, M_DEVBUF);
1134 }
1135
1136 /*
1137  * bridge_delete_span:
1138  *
1139  *      Delete the specified span interface.
1140  */
1141 static void
1142 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1143 {
1144         BRIDGE_LOCK_ASSERT(sc);
1145
1146         KASSERT(bif->bif_ifp->if_bridge == NULL,
1147             ("%s: not a span interface", __func__));
1148
1149         CK_LIST_REMOVE(bif, bif_next);
1150         free(bif, M_DEVBUF);
1151 }
1152
1153 static int
1154 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1155 {
1156         struct ifbreq *req = arg;
1157         struct bridge_iflist *bif = NULL;
1158         struct ifnet *ifs;
1159         int error = 0;
1160
1161         ifs = ifunit(req->ifbr_ifsname);
1162         if (ifs == NULL)
1163                 return (ENOENT);
1164         if (ifs->if_ioctl == NULL)      /* must be supported */
1165                 return (EINVAL);
1166
1167         /* If it's in the span list, it can't be a member. */
1168         CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1169                 if (ifs == bif->bif_ifp)
1170                         return (EBUSY);
1171
1172         if (ifs->if_bridge == sc)
1173                 return (EEXIST);
1174
1175         if (ifs->if_bridge != NULL)
1176                 return (EBUSY);
1177
1178         switch (ifs->if_type) {
1179         case IFT_ETHER:
1180         case IFT_L2VLAN:
1181         case IFT_GIF:
1182                 /* permitted interface types */
1183                 break;
1184         default:
1185                 return (EINVAL);
1186         }
1187
1188 #ifdef INET6
1189         /*
1190          * Two valid inet6 addresses with link-local scope must not be
1191          * on the parent interface and the member interfaces at the
1192          * same time.  This restriction is needed to prevent violation
1193          * of link-local scope zone.  Attempts to add a member
1194          * interface which has inet6 addresses when the parent has
1195          * inet6 triggers removal of all inet6 addresses on the member
1196          * interface.
1197          */
1198
1199         /* Check if the parent interface has a link-local scope addr. */
1200         if (V_allow_llz_overlap == 0 &&
1201             in6ifa_llaonifp(sc->sc_ifp) != NULL) {
1202                 /*
1203                  * If any, remove all inet6 addresses from the member
1204                  * interfaces.
1205                  */
1206                 BRIDGE_XLOCK(sc);
1207                 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1208                         if (in6ifa_llaonifp(bif->bif_ifp)) {
1209                                 BRIDGE_UNLOCK(sc);
1210                                 in6_ifdetach(bif->bif_ifp);
1211                                 BRIDGE_LOCK(sc);
1212                                 if_printf(sc->sc_ifp,
1213                                     "IPv6 addresses on %s have been removed "
1214                                     "before adding it as a member to prevent "
1215                                     "IPv6 address scope violation.\n",
1216                                     bif->bif_ifp->if_xname);
1217                         }
1218                 }
1219                 BRIDGE_XDROP(sc);
1220                 if (in6ifa_llaonifp(ifs)) {
1221                         BRIDGE_UNLOCK(sc);
1222                         in6_ifdetach(ifs);
1223                         BRIDGE_LOCK(sc);
1224                         if_printf(sc->sc_ifp,
1225                             "IPv6 addresses on %s have been removed "
1226                             "before adding it as a member to prevent "
1227                             "IPv6 address scope violation.\n",
1228                             ifs->if_xname);
1229                 }
1230         }
1231 #endif
1232         /* Allow the first Ethernet member to define the MTU */
1233         if (CK_LIST_EMPTY(&sc->sc_iflist))
1234                 sc->sc_ifp->if_mtu = ifs->if_mtu;
1235         else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
1236                 if_printf(sc->sc_ifp, "invalid MTU: %u(%s) != %u\n",
1237                     ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu);
1238                 return (EINVAL);
1239         }
1240
1241         bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1242         if (bif == NULL)
1243                 return (ENOMEM);
1244
1245         bif->bif_ifp = ifs;
1246         bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1247         bif->bif_savedcaps = ifs->if_capenable;
1248
1249         /*
1250          * Assign the interface's MAC address to the bridge if it's the first
1251          * member and the MAC address of the bridge has not been changed from
1252          * the default randomly generated one.
1253          */
1254         if (V_bridge_inherit_mac && CK_LIST_EMPTY(&sc->sc_iflist) &&
1255             !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) {
1256                 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1257                 sc->sc_ifaddr = ifs;
1258                 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1259         }
1260
1261         ifs->if_bridge = sc;
1262         ifs->if_bridge_output = bridge_output;
1263         ifs->if_bridge_input = bridge_input;
1264         ifs->if_bridge_linkstate = bridge_linkstate;
1265         bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1266         /*
1267          * XXX: XLOCK HERE!?!
1268          *
1269          * NOTE: insert_***HEAD*** should be safe for the traversals.
1270          */
1271         CK_LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1272
1273         /* Set interface capabilities to the intersection set of all members */
1274         bridge_mutecaps(sc);
1275         bridge_linkcheck(sc);
1276
1277         /* Place the interface into promiscuous mode */
1278         switch (ifs->if_type) {
1279                 case IFT_ETHER:
1280                 case IFT_L2VLAN:
1281                         BRIDGE_UNLOCK(sc);
1282                         error = ifpromisc(ifs, 1);
1283                         BRIDGE_LOCK(sc);
1284                         break;
1285         }
1286
1287         if (error)
1288                 bridge_delete_member(sc, bif, 0);
1289         return (error);
1290 }
1291
1292 static int
1293 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1294 {
1295         struct ifbreq *req = arg;
1296         struct bridge_iflist *bif;
1297
1298         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1299         if (bif == NULL)
1300                 return (ENOENT);
1301
1302         bridge_delete_member(sc, bif, 0);
1303
1304         return (0);
1305 }
1306
1307 static int
1308 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1309 {
1310         struct ifbreq *req = arg;
1311         struct bridge_iflist *bif;
1312         struct bstp_port *bp;
1313
1314         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1315         if (bif == NULL)
1316                 return (ENOENT);
1317
1318         bp = &bif->bif_stp;
1319         req->ifbr_ifsflags = bif->bif_flags;
1320         req->ifbr_state = bp->bp_state;
1321         req->ifbr_priority = bp->bp_priority;
1322         req->ifbr_path_cost = bp->bp_path_cost;
1323         req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1324         req->ifbr_proto = bp->bp_protover;
1325         req->ifbr_role = bp->bp_role;
1326         req->ifbr_stpflags = bp->bp_flags;
1327         req->ifbr_addrcnt = bif->bif_addrcnt;
1328         req->ifbr_addrmax = bif->bif_addrmax;
1329         req->ifbr_addrexceeded = bif->bif_addrexceeded;
1330
1331         /* Copy STP state options as flags */
1332         if (bp->bp_operedge)
1333                 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1334         if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1335                 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1336         if (bp->bp_ptp_link)
1337                 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1338         if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1339                 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1340         if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1341                 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1342         if (bp->bp_flags & BSTP_PORT_ADMCOST)
1343                 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1344         return (0);
1345 }
1346
1347 static int
1348 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1349 {
1350         struct ifbreq *req = arg;
1351         struct bridge_iflist *bif;
1352         struct bstp_port *bp;
1353         int error;
1354
1355         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1356         if (bif == NULL)
1357                 return (ENOENT);
1358         bp = &bif->bif_stp;
1359
1360         if (req->ifbr_ifsflags & IFBIF_SPAN)
1361                 /* SPAN is readonly */
1362                 return (EINVAL);
1363
1364         if (req->ifbr_ifsflags & IFBIF_STP) {
1365                 if ((bif->bif_flags & IFBIF_STP) == 0) {
1366                         error = bstp_enable(&bif->bif_stp);
1367                         if (error)
1368                                 return (error);
1369                 }
1370         } else {
1371                 if ((bif->bif_flags & IFBIF_STP) != 0)
1372                         bstp_disable(&bif->bif_stp);
1373         }
1374
1375         /* Pass on STP flags */
1376         bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1377         bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1378         bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1379         bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1380
1381         /* Save the bits relating to the bridge */
1382         bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1383
1384         return (0);
1385 }
1386
1387 static int
1388 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1389 {
1390         struct ifbrparam *param = arg;
1391
1392         sc->sc_brtmax = param->ifbrp_csize;
1393         bridge_rttrim(sc);
1394
1395         return (0);
1396 }
1397
1398 static int
1399 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1400 {
1401         struct ifbrparam *param = arg;
1402
1403         param->ifbrp_csize = sc->sc_brtmax;
1404
1405         return (0);
1406 }
1407
1408 static int
1409 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1410 {
1411         struct ifbifconf *bifc = arg;
1412         struct bridge_iflist *bif;
1413         struct ifbreq breq;
1414         char *buf, *outbuf;
1415         int count, buflen, len, error = 0;
1416
1417         count = 0;
1418         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1419                 count++;
1420         CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1421                 count++;
1422
1423         buflen = sizeof(breq) * count;
1424         if (bifc->ifbic_len == 0) {
1425                 bifc->ifbic_len = buflen;
1426                 return (0);
1427         }
1428         BRIDGE_UNLOCK(sc);
1429         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1430         BRIDGE_LOCK(sc);
1431
1432         count = 0;
1433         buf = outbuf;
1434         len = min(bifc->ifbic_len, buflen);
1435         bzero(&breq, sizeof(breq));
1436         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1437                 if (len < sizeof(breq))
1438                         break;
1439
1440                 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1441                     sizeof(breq.ifbr_ifsname));
1442                 /* Fill in the ifbreq structure */
1443                 error = bridge_ioctl_gifflags(sc, &breq);
1444                 if (error)
1445                         break;
1446                 memcpy(buf, &breq, sizeof(breq));
1447                 count++;
1448                 buf += sizeof(breq);
1449                 len -= sizeof(breq);
1450         }
1451         CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1452                 if (len < sizeof(breq))
1453                         break;
1454
1455                 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1456                     sizeof(breq.ifbr_ifsname));
1457                 breq.ifbr_ifsflags = bif->bif_flags;
1458                 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1459                 memcpy(buf, &breq, sizeof(breq));
1460                 count++;
1461                 buf += sizeof(breq);
1462                 len -= sizeof(breq);
1463         }
1464
1465         BRIDGE_UNLOCK(sc);
1466         bifc->ifbic_len = sizeof(breq) * count;
1467         error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1468         BRIDGE_LOCK(sc);
1469         free(outbuf, M_TEMP);
1470         return (error);
1471 }
1472
1473 static int
1474 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1475 {
1476         struct ifbaconf *bac = arg;
1477         struct bridge_rtnode *brt;
1478         struct ifbareq bareq;
1479         char *buf, *outbuf;
1480         int count, buflen, len, error = 0;
1481
1482         if (bac->ifbac_len == 0)
1483                 return (0);
1484
1485         count = 0;
1486         CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1487                 count++;
1488         buflen = sizeof(bareq) * count;
1489
1490         BRIDGE_UNLOCK(sc);
1491         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1492         BRIDGE_LOCK(sc);
1493
1494         count = 0;
1495         buf = outbuf;
1496         len = min(bac->ifbac_len, buflen);
1497         bzero(&bareq, sizeof(bareq));
1498         CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1499                 if (len < sizeof(bareq))
1500                         goto out;
1501                 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1502                     sizeof(bareq.ifba_ifsname));
1503                 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1504                 bareq.ifba_vlan = brt->brt_vlan;
1505                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1506                                 time_uptime < brt->brt_expire)
1507                         bareq.ifba_expire = brt->brt_expire - time_uptime;
1508                 else
1509                         bareq.ifba_expire = 0;
1510                 bareq.ifba_flags = brt->brt_flags;
1511
1512                 memcpy(buf, &bareq, sizeof(bareq));
1513                 count++;
1514                 buf += sizeof(bareq);
1515                 len -= sizeof(bareq);
1516         }
1517 out:
1518         BRIDGE_UNLOCK(sc);
1519         bac->ifbac_len = sizeof(bareq) * count;
1520         error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1521         BRIDGE_LOCK(sc);
1522         free(outbuf, M_TEMP);
1523         return (error);
1524 }
1525
1526 static int
1527 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1528 {
1529         struct ifbareq *req = arg;
1530         struct bridge_iflist *bif;
1531         int error;
1532
1533         bif = bridge_lookup_member(sc, req->ifba_ifsname);
1534         if (bif == NULL)
1535                 return (ENOENT);
1536
1537         error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1538             req->ifba_flags);
1539
1540         return (error);
1541 }
1542
1543 static int
1544 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1545 {
1546         struct ifbrparam *param = arg;
1547
1548         sc->sc_brttimeout = param->ifbrp_ctime;
1549         return (0);
1550 }
1551
1552 static int
1553 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1554 {
1555         struct ifbrparam *param = arg;
1556
1557         param->ifbrp_ctime = sc->sc_brttimeout;
1558         return (0);
1559 }
1560
1561 static int
1562 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1563 {
1564         struct ifbareq *req = arg;
1565
1566         return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
1567 }
1568
1569 static int
1570 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1571 {
1572         struct ifbreq *req = arg;
1573
1574         bridge_rtflush(sc, req->ifbr_ifsflags);
1575         return (0);
1576 }
1577
1578 static int
1579 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1580 {
1581         struct ifbrparam *param = arg;
1582         struct bstp_state *bs = &sc->sc_stp;
1583
1584         param->ifbrp_prio = bs->bs_bridge_priority;
1585         return (0);
1586 }
1587
1588 static int
1589 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1590 {
1591         struct ifbrparam *param = arg;
1592
1593         return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1594 }
1595
1596 static int
1597 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1598 {
1599         struct ifbrparam *param = arg;
1600         struct bstp_state *bs = &sc->sc_stp;
1601
1602         param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1603         return (0);
1604 }
1605
1606 static int
1607 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1608 {
1609         struct ifbrparam *param = arg;
1610
1611         return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1612 }
1613
1614 static int
1615 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1616 {
1617         struct ifbrparam *param = arg;
1618         struct bstp_state *bs = &sc->sc_stp;
1619
1620         param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1621         return (0);
1622 }
1623
1624 static int
1625 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1626 {
1627         struct ifbrparam *param = arg;
1628
1629         return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1630 }
1631
1632 static int
1633 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1634 {
1635         struct ifbrparam *param = arg;
1636         struct bstp_state *bs = &sc->sc_stp;
1637
1638         param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1639         return (0);
1640 }
1641
1642 static int
1643 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1644 {
1645         struct ifbrparam *param = arg;
1646
1647         return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1648 }
1649
1650 static int
1651 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1652 {
1653         struct ifbreq *req = arg;
1654         struct bridge_iflist *bif;
1655
1656         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1657         if (bif == NULL)
1658                 return (ENOENT);
1659
1660         return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1661 }
1662
1663 static int
1664 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1665 {
1666         struct ifbreq *req = arg;
1667         struct bridge_iflist *bif;
1668
1669         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1670         if (bif == NULL)
1671                 return (ENOENT);
1672
1673         return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1674 }
1675
1676 static int
1677 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1678 {
1679         struct ifbreq *req = arg;
1680         struct bridge_iflist *bif;
1681
1682         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1683         if (bif == NULL)
1684                 return (ENOENT);
1685
1686         bif->bif_addrmax = req->ifbr_addrmax;
1687         return (0);
1688 }
1689
1690 static int
1691 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1692 {
1693         struct ifbreq *req = arg;
1694         struct bridge_iflist *bif = NULL;
1695         struct ifnet *ifs;
1696
1697         ifs = ifunit(req->ifbr_ifsname);
1698         if (ifs == NULL)
1699                 return (ENOENT);
1700
1701         CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1702                 if (ifs == bif->bif_ifp)
1703                         return (EBUSY);
1704
1705         if (ifs->if_bridge != NULL)
1706                 return (EBUSY);
1707
1708         switch (ifs->if_type) {
1709                 case IFT_ETHER:
1710                 case IFT_GIF:
1711                 case IFT_L2VLAN:
1712                         break;
1713                 default:
1714                         return (EINVAL);
1715         }
1716
1717         bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1718         if (bif == NULL)
1719                 return (ENOMEM);
1720
1721         bif->bif_ifp = ifs;
1722         bif->bif_flags = IFBIF_SPAN;
1723
1724         CK_LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1725
1726         return (0);
1727 }
1728
1729 static int
1730 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1731 {
1732         struct ifbreq *req = arg;
1733         struct bridge_iflist *bif;
1734         struct ifnet *ifs;
1735
1736         ifs = ifunit(req->ifbr_ifsname);
1737         if (ifs == NULL)
1738                 return (ENOENT);
1739
1740         CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1741                 if (ifs == bif->bif_ifp)
1742                         break;
1743
1744         if (bif == NULL)
1745                 return (ENOENT);
1746
1747         bridge_delete_span(sc, bif);
1748
1749         return (0);
1750 }
1751
1752 static int
1753 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1754 {
1755         struct ifbropreq *req = arg;
1756         struct bstp_state *bs = &sc->sc_stp;
1757         struct bstp_port *root_port;
1758
1759         req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1760         req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1761         req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1762
1763         root_port = bs->bs_root_port;
1764         if (root_port == NULL)
1765                 req->ifbop_root_port = 0;
1766         else
1767                 req->ifbop_root_port = root_port->bp_ifp->if_index;
1768
1769         req->ifbop_holdcount = bs->bs_txholdcount;
1770         req->ifbop_priority = bs->bs_bridge_priority;
1771         req->ifbop_protocol = bs->bs_protover;
1772         req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1773         req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1774         req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1775         req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1776         req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1777         req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1778
1779         return (0);
1780 }
1781
1782 static int
1783 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1784 {
1785         struct ifbrparam *param = arg;
1786
1787         param->ifbrp_cexceeded = sc->sc_brtexceeded;
1788         return (0);
1789 }
1790
1791 static int
1792 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1793 {
1794         struct ifbpstpconf *bifstp = arg;
1795         struct bridge_iflist *bif;
1796         struct bstp_port *bp;
1797         struct ifbpstpreq bpreq;
1798         char *buf, *outbuf;
1799         int count, buflen, len, error = 0;
1800
1801         count = 0;
1802         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1803                 if ((bif->bif_flags & IFBIF_STP) != 0)
1804                         count++;
1805         }
1806
1807         buflen = sizeof(bpreq) * count;
1808         if (bifstp->ifbpstp_len == 0) {
1809                 bifstp->ifbpstp_len = buflen;
1810                 return (0);
1811         }
1812
1813         BRIDGE_UNLOCK(sc);
1814         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1815         BRIDGE_LOCK(sc);
1816
1817         count = 0;
1818         buf = outbuf;
1819         len = min(bifstp->ifbpstp_len, buflen);
1820         bzero(&bpreq, sizeof(bpreq));
1821         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1822                 if (len < sizeof(bpreq))
1823                         break;
1824
1825                 if ((bif->bif_flags & IFBIF_STP) == 0)
1826                         continue;
1827
1828                 bp = &bif->bif_stp;
1829                 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1830                 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1831                 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1832                 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1833                 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1834                 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1835
1836                 memcpy(buf, &bpreq, sizeof(bpreq));
1837                 count++;
1838                 buf += sizeof(bpreq);
1839                 len -= sizeof(bpreq);
1840         }
1841
1842         BRIDGE_UNLOCK(sc);
1843         bifstp->ifbpstp_len = sizeof(bpreq) * count;
1844         error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1845         BRIDGE_LOCK(sc);
1846         free(outbuf, M_TEMP);
1847         return (error);
1848 }
1849
1850 static int
1851 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1852 {
1853         struct ifbrparam *param = arg;
1854
1855         return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1856 }
1857
1858 static int
1859 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1860 {
1861         struct ifbrparam *param = arg;
1862
1863         return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1864 }
1865
1866 /*
1867  * bridge_ifdetach:
1868  *
1869  *      Detach an interface from a bridge.  Called when a member
1870  *      interface is detaching.
1871  */
1872 static void
1873 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1874 {
1875         struct bridge_softc *sc = ifp->if_bridge;
1876         struct bridge_iflist *bif;
1877
1878         if (ifp->if_flags & IFF_RENAMING)
1879                 return;
1880         if (V_bridge_cloner == NULL) {
1881                 /*
1882                  * This detach handler can be called after
1883                  * vnet_bridge_uninit().  Just return in that case.
1884                  */
1885                 return;
1886         }
1887         /* Check if the interface is a bridge member */
1888         if (sc != NULL) {
1889                 BRIDGE_LOCK(sc);
1890
1891                 bif = bridge_lookup_member_if(sc, ifp);
1892                 if (bif != NULL)
1893                         bridge_delete_member(sc, bif, 1);
1894
1895                 BRIDGE_UNLOCK(sc);
1896                 return;
1897         }
1898
1899         /* Check if the interface is a span port */
1900         BRIDGE_LIST_LOCK();
1901         LIST_FOREACH(sc, &V_bridge_list, sc_list) {
1902                 BRIDGE_LOCK(sc);
1903                 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1904                         if (ifp == bif->bif_ifp) {
1905                                 bridge_delete_span(sc, bif);
1906                                 break;
1907                         }
1908
1909                 BRIDGE_UNLOCK(sc);
1910         }
1911         BRIDGE_LIST_UNLOCK();
1912 }
1913
1914 /*
1915  * bridge_init:
1916  *
1917  *      Initialize a bridge interface.
1918  */
1919 static void
1920 bridge_init(void *xsc)
1921 {
1922         struct bridge_softc *sc = (struct bridge_softc *)xsc;
1923         struct ifnet *ifp = sc->sc_ifp;
1924
1925         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1926                 return;
1927
1928         BRIDGE_LOCK(sc);
1929         callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1930             bridge_timer, sc);
1931
1932         ifp->if_drv_flags |= IFF_DRV_RUNNING;
1933         bstp_init(&sc->sc_stp);         /* Initialize Spanning Tree */
1934
1935         BRIDGE_UNLOCK(sc);
1936 }
1937
1938 /*
1939  * bridge_stop:
1940  *
1941  *      Stop the bridge interface.
1942  */
1943 static void
1944 bridge_stop(struct ifnet *ifp, int disable)
1945 {
1946         struct bridge_softc *sc = ifp->if_softc;
1947
1948         BRIDGE_LOCK_ASSERT(sc);
1949
1950         if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1951                 return;
1952
1953         callout_stop(&sc->sc_brcallout);
1954         bstp_stop(&sc->sc_stp);
1955
1956         bridge_rtflush(sc, IFBF_FLUSHDYN);
1957
1958         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1959 }
1960
1961 /*
1962  * bridge_enqueue:
1963  *
1964  *      Enqueue a packet on a bridge member interface.
1965  *
1966  */
1967 static int
1968 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
1969 {
1970         int len, err = 0;
1971         short mflags;
1972         struct mbuf *m0;
1973
1974         /* We may be sending a fragment so traverse the mbuf */
1975         for (; m; m = m0) {
1976                 m0 = m->m_nextpkt;
1977                 m->m_nextpkt = NULL;
1978                 len = m->m_pkthdr.len;
1979                 mflags = m->m_flags;
1980
1981                 /*
1982                  * If underlying interface can not do VLAN tag insertion itself
1983                  * then attach a packet tag that holds it.
1984                  */
1985                 if ((m->m_flags & M_VLANTAG) &&
1986                     (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
1987                         m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
1988                         if (m == NULL) {
1989                                 if_printf(dst_ifp,
1990                                     "unable to prepend VLAN header\n");
1991                                 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1);
1992                                 continue;
1993                         }
1994                         m->m_flags &= ~M_VLANTAG;
1995                 }
1996
1997                 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */
1998                 if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
1999                         m_freem(m0);
2000                         if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2001                         break;
2002                 }
2003
2004                 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1);
2005                 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len);
2006                 if (mflags & M_MCAST)
2007                         if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1);
2008         }
2009
2010         return (err);
2011 }
2012
2013 /*
2014  * bridge_dummynet:
2015  *
2016  *      Receive a queued packet from dummynet and pass it on to the output
2017  *      interface.
2018  *
2019  *      The mbuf has the Ethernet header already attached.
2020  */
2021 static void
2022 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
2023 {
2024         struct bridge_softc *sc;
2025
2026         sc = ifp->if_bridge;
2027
2028         /*
2029          * The packet didnt originate from a member interface. This should only
2030          * ever happen if a member interface is removed while packets are
2031          * queued for it.
2032          */
2033         if (sc == NULL) {
2034                 m_freem(m);
2035                 return;
2036         }
2037
2038         if (PFIL_HOOKED_OUT(V_inet_pfil_head)
2039 #ifdef INET6
2040             || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2041 #endif
2042             ) {
2043                 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
2044                         return;
2045                 if (m == NULL)
2046                         return;
2047         }
2048
2049         bridge_enqueue(sc, ifp, m);
2050 }
2051
2052 /*
2053  * bridge_output:
2054  *
2055  *      Send output from a bridge member interface.  This
2056  *      performs the bridging function for locally originated
2057  *      packets.
2058  *
2059  *      The mbuf has the Ethernet header already attached.  We must
2060  *      enqueue or free the mbuf before returning.
2061  */
2062 static int
2063 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
2064     struct route *ro __unused)
2065 {
2066         struct ether_header *eh;
2067         struct ifnet *bifp, *dst_if;
2068         struct bridge_softc *sc;
2069         uint16_t vlan;
2070
2071         if (m->m_len < ETHER_HDR_LEN) {
2072                 m = m_pullup(m, ETHER_HDR_LEN);
2073                 if (m == NULL)
2074                         return (0);
2075         }
2076
2077         eh = mtod(m, struct ether_header *);
2078         sc = ifp->if_bridge;
2079         vlan = VLANTAGOF(m);
2080
2081         BRIDGE_LOCK(sc);
2082         bifp = sc->sc_ifp;
2083
2084         /*
2085          * If bridge is down, but the original output interface is up,
2086          * go ahead and send out that interface.  Otherwise, the packet
2087          * is dropped below.
2088          */
2089         if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2090                 dst_if = ifp;
2091                 goto sendunicast;
2092         }
2093
2094         /*
2095          * If the packet is a multicast, or we don't know a better way to
2096          * get there, send to all interfaces.
2097          */
2098         if (ETHER_IS_MULTICAST(eh->ether_dhost))
2099                 dst_if = NULL;
2100         else
2101                 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
2102         /* Tap any traffic not passing back out the originating interface */
2103         if (dst_if != ifp)
2104                 ETHER_BPF_MTAP(bifp, m);
2105         if (dst_if == NULL) {
2106                 struct bridge_iflist *bif;
2107                 struct mbuf *mc;
2108                 int error = 0, used = 0;
2109
2110                 bridge_span(sc, m);
2111
2112                 BRIDGE_LOCK2REF(sc, error);
2113                 if (error) {
2114                         m_freem(m);
2115                         return (0);
2116                 }
2117
2118                 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
2119                         dst_if = bif->bif_ifp;
2120
2121                         if (dst_if->if_type == IFT_GIF)
2122                                 continue;
2123                         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2124                                 continue;
2125
2126                         /*
2127                          * If this is not the original output interface,
2128                          * and the interface is participating in spanning
2129                          * tree, make sure the port is in a state that
2130                          * allows forwarding.
2131                          */
2132                         if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
2133                             bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2134                                 continue;
2135
2136                         if (CK_LIST_NEXT(bif, bif_next) == NULL) {
2137                                 used = 1;
2138                                 mc = m;
2139                         } else {
2140                                 mc = m_copypacket(m, M_NOWAIT);
2141                                 if (mc == NULL) {
2142                                         if_inc_counter(bifp, IFCOUNTER_OERRORS, 1);
2143                                         continue;
2144                                 }
2145                         }
2146
2147                         bridge_enqueue(sc, dst_if, mc);
2148                 }
2149                 if (used == 0)
2150                         m_freem(m);
2151                 BRIDGE_UNREF(sc);
2152                 return (0);
2153         }
2154
2155 sendunicast:
2156         /*
2157          * XXX Spanning tree consideration here?
2158          */
2159
2160         bridge_span(sc, m);
2161         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2162                 m_freem(m);
2163                 BRIDGE_UNLOCK(sc);
2164                 return (0);
2165         }
2166
2167         BRIDGE_UNLOCK(sc);
2168         bridge_enqueue(sc, dst_if, m);
2169         return (0);
2170 }
2171
2172 /*
2173  * bridge_transmit:
2174  *
2175  *      Do output on a bridge.
2176  *
2177  */
2178 static int
2179 bridge_transmit(struct ifnet *ifp, struct mbuf *m)
2180 {
2181         struct bridge_softc *sc;
2182         struct ether_header *eh;
2183         struct ifnet *dst_if;
2184         int error = 0;
2185
2186         sc = ifp->if_softc;
2187
2188         ETHER_BPF_MTAP(ifp, m);
2189
2190         eh = mtod(m, struct ether_header *);
2191
2192         BRIDGE_LOCK(sc);
2193         if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) &&
2194             (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) {
2195                 BRIDGE_UNLOCK(sc);
2196                 error = bridge_enqueue(sc, dst_if, m);
2197         } else
2198                 bridge_broadcast(sc, ifp, m, 0);
2199
2200         return (error);
2201 }
2202
2203 /*
2204  * The ifp->if_qflush entry point for if_bridge(4) is no-op.
2205  */
2206 static void
2207 bridge_qflush(struct ifnet *ifp __unused)
2208 {
2209 }
2210
2211 /*
2212  * bridge_forward:
2213  *
2214  *      The forwarding function of the bridge.
2215  *
2216  *      NOTE: Releases the lock on return.
2217  */
2218 static void
2219 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
2220     struct mbuf *m)
2221 {
2222         struct bridge_iflist *dbif;
2223         struct ifnet *src_if, *dst_if, *ifp;
2224         struct ether_header *eh;
2225         uint16_t vlan;
2226         uint8_t *dst;
2227         int error;
2228
2229         src_if = m->m_pkthdr.rcvif;
2230         ifp = sc->sc_ifp;
2231
2232         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
2233         if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2234         vlan = VLANTAGOF(m);
2235
2236         if ((sbif->bif_flags & IFBIF_STP) &&
2237             sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2238                 goto drop;
2239
2240         eh = mtod(m, struct ether_header *);
2241         dst = eh->ether_dhost;
2242
2243         /* If the interface is learning, record the address. */
2244         if (sbif->bif_flags & IFBIF_LEARNING) {
2245                 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2246                     sbif, 0, IFBAF_DYNAMIC);
2247                 /*
2248                  * If the interface has addresses limits then deny any source
2249                  * that is not in the cache.
2250                  */
2251                 if (error && sbif->bif_addrmax)
2252                         goto drop;
2253         }
2254
2255         if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2256             sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2257                 goto drop;
2258
2259         /*
2260          * At this point, the port either doesn't participate
2261          * in spanning tree or it is in the forwarding state.
2262          */
2263
2264         /*
2265          * If the packet is unicast, destined for someone on
2266          * "this" side of the bridge, drop it.
2267          */
2268         if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2269                 dst_if = bridge_rtlookup(sc, dst, vlan);
2270                 if (src_if == dst_if)
2271                         goto drop;
2272         } else {
2273                 /*
2274                  * Check if its a reserved multicast address, any address
2275                  * listed in 802.1D section 7.12.6 may not be forwarded by the
2276                  * bridge.
2277                  * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2278                  */
2279                 if (dst[0] == 0x01 && dst[1] == 0x80 &&
2280                     dst[2] == 0xc2 && dst[3] == 0x00 &&
2281                     dst[4] == 0x00 && dst[5] <= 0x0f)
2282                         goto drop;
2283
2284                 /* ...forward it to all interfaces. */
2285                 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
2286                 dst_if = NULL;
2287         }
2288
2289         /*
2290          * If we have a destination interface which is a member of our bridge,
2291          * OR this is a unicast packet, push it through the bpf(4) machinery.
2292          * For broadcast or multicast packets, don't bother because it will
2293          * be reinjected into ether_input. We do this before we pass the packets
2294          * through the pfil(9) framework, as it is possible that pfil(9) will
2295          * drop the packet, or possibly modify it, making it difficult to debug
2296          * firewall issues on the bridge.
2297          */
2298         if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2299                 ETHER_BPF_MTAP(ifp, m);
2300
2301         /* run the packet filter */
2302         if (PFIL_HOOKED_IN(V_inet_pfil_head)
2303 #ifdef INET6
2304             || PFIL_HOOKED_IN(V_inet6_pfil_head)
2305 #endif
2306             ) {
2307                 BRIDGE_UNLOCK(sc);
2308                 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2309                         return;
2310                 if (m == NULL)
2311                         return;
2312                 BRIDGE_LOCK(sc);
2313         }
2314
2315         if (dst_if == NULL) {
2316                 bridge_broadcast(sc, src_if, m, 1);
2317                 return;
2318         }
2319
2320         /*
2321          * At this point, we're dealing with a unicast frame
2322          * going to a different interface.
2323          */
2324         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2325                 goto drop;
2326
2327         dbif = bridge_lookup_member_if(sc, dst_if);
2328         if (dbif == NULL)
2329                 /* Not a member of the bridge (anymore?) */
2330                 goto drop;
2331
2332         /* Private segments can not talk to each other */
2333         if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2334                 goto drop;
2335
2336         if ((dbif->bif_flags & IFBIF_STP) &&
2337             dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2338                 goto drop;
2339
2340         BRIDGE_UNLOCK(sc);
2341
2342         if (PFIL_HOOKED_OUT(V_inet_pfil_head)
2343 #ifdef INET6
2344             || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2345 #endif
2346             ) {
2347                 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2348                         return;
2349                 if (m == NULL)
2350                         return;
2351         }
2352
2353         bridge_enqueue(sc, dst_if, m);
2354         return;
2355
2356 drop:
2357         BRIDGE_UNLOCK(sc);
2358         m_freem(m);
2359 }
2360
2361 /*
2362  * bridge_input:
2363  *
2364  *      Receive input from a member interface.  Queue the packet for
2365  *      bridging if it is not for us.
2366  */
2367 static struct mbuf *
2368 bridge_input(struct ifnet *ifp, struct mbuf *m)
2369 {
2370         struct bridge_softc *sc = ifp->if_bridge;
2371         struct bridge_iflist *bif, *bif2;
2372         struct ifnet *bifp;
2373         struct ether_header *eh;
2374         struct mbuf *mc, *mc2;
2375         uint16_t vlan;
2376         int error;
2377
2378         if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2379                 return (m);
2380
2381         bifp = sc->sc_ifp;
2382         vlan = VLANTAGOF(m);
2383
2384         /*
2385          * Implement support for bridge monitoring. If this flag has been
2386          * set on this interface, discard the packet once we push it through
2387          * the bpf(4) machinery, but before we do, increment the byte and
2388          * packet counters associated with this interface.
2389          */
2390         if ((bifp->if_flags & IFF_MONITOR) != 0) {
2391                 m->m_pkthdr.rcvif  = bifp;
2392                 ETHER_BPF_MTAP(bifp, m);
2393                 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1);
2394                 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2395                 m_freem(m);
2396                 return (NULL);
2397         }
2398         BRIDGE_LOCK(sc);
2399         bif = bridge_lookup_member_if(sc, ifp);
2400         if (bif == NULL) {
2401                 BRIDGE_UNLOCK(sc);
2402                 return (m);
2403         }
2404
2405         eh = mtod(m, struct ether_header *);
2406
2407         bridge_span(sc, m);
2408
2409         if (m->m_flags & (M_BCAST|M_MCAST)) {
2410                 /* Tap off 802.1D packets; they do not get forwarded. */
2411                 if (memcmp(eh->ether_dhost, bstp_etheraddr,
2412                     ETHER_ADDR_LEN) == 0) {
2413                         bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
2414                         BRIDGE_UNLOCK(sc);
2415                         return (NULL);
2416                 }
2417
2418                 if ((bif->bif_flags & IFBIF_STP) &&
2419                     bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2420                         BRIDGE_UNLOCK(sc);
2421                         return (m);
2422                 }
2423
2424                 /*
2425                  * Make a deep copy of the packet and enqueue the copy
2426                  * for bridge processing; return the original packet for
2427                  * local processing.
2428                  */
2429                 mc = m_dup(m, M_NOWAIT);
2430                 if (mc == NULL) {
2431                         BRIDGE_UNLOCK(sc);
2432                         return (m);
2433                 }
2434
2435                 /* Perform the bridge forwarding function with the copy. */
2436                 bridge_forward(sc, bif, mc);
2437
2438                 /*
2439                  * Reinject the mbuf as arriving on the bridge so we have a
2440                  * chance at claiming multicast packets. We can not loop back
2441                  * here from ether_input as a bridge is never a member of a
2442                  * bridge.
2443                  */
2444                 KASSERT(bifp->if_bridge == NULL,
2445                     ("loop created in bridge_input"));
2446                 mc2 = m_dup(m, M_NOWAIT);
2447                 if (mc2 != NULL) {
2448                         /* Keep the layer3 header aligned */
2449                         int i = min(mc2->m_pkthdr.len, max_protohdr);
2450                         mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2451                 }
2452                 if (mc2 != NULL) {
2453                         mc2->m_pkthdr.rcvif = bifp;
2454                         (*bifp->if_input)(bifp, mc2);
2455                 }
2456
2457                 /* Return the original packet for local processing. */
2458                 return (m);
2459         }
2460
2461         if ((bif->bif_flags & IFBIF_STP) &&
2462             bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2463                 BRIDGE_UNLOCK(sc);
2464                 return (m);
2465         }
2466
2467 #if (defined(INET) || defined(INET6))
2468 #   define OR_CARP_CHECK_WE_ARE_DST(iface) \
2469         || ((iface)->if_carp \
2470             && (*carp_forus_p)((iface), eh->ether_dhost))
2471 #   define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2472         || ((iface)->if_carp \
2473             && (*carp_forus_p)((iface), eh->ether_shost))
2474 #else
2475 #   define OR_CARP_CHECK_WE_ARE_DST(iface)
2476 #   define OR_CARP_CHECK_WE_ARE_SRC(iface)
2477 #endif
2478
2479 #ifdef INET6
2480 #   define OR_PFIL_HOOKED_INET6 \
2481         || PFIL_HOOKED_IN(V_inet6_pfil_head)
2482 #else
2483 #   define OR_PFIL_HOOKED_INET6
2484 #endif
2485
2486 #define GRAB_OUR_PACKETS(iface) \
2487         if ((iface)->if_type == IFT_GIF) \
2488                 continue; \
2489         /* It is destined for us. */ \
2490         if (memcmp(IF_LLADDR((iface)), eh->ether_dhost,  ETHER_ADDR_LEN) == 0 \
2491             OR_CARP_CHECK_WE_ARE_DST((iface))                           \
2492             ) {                                                         \
2493                 if (bif->bif_flags & IFBIF_LEARNING) {                  \
2494                         error = bridge_rtupdate(sc, eh->ether_shost,    \
2495                             vlan, bif, 0, IFBAF_DYNAMIC);               \
2496                         if (error && bif->bif_addrmax) {                \
2497                                 BRIDGE_UNLOCK(sc);                      \
2498                                 m_freem(m);                             \
2499                                 return (NULL);                          \
2500                         }                                               \
2501                 }                                                       \
2502                 m->m_pkthdr.rcvif = iface;                              \
2503                 if ((iface) == ifp) {                                   \
2504                         /* Skip bridge processing... src == dest */     \
2505                         BRIDGE_UNLOCK(sc);                              \
2506                         return (m);                                     \
2507                 }                                                       \
2508                 /* It's passing over or to the bridge, locally. */      \
2509                 ETHER_BPF_MTAP(bifp, m);                                \
2510                 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1);            \
2511                 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); \
2512                 /* Filter on the physical interface. */                 \
2513                 if (V_pfil_local_phys && (PFIL_HOOKED_IN(V_inet_pfil_head) \
2514                      OR_PFIL_HOOKED_INET6)) {                           \
2515                         if (bridge_pfil(&m, NULL, ifp,                  \
2516                             PFIL_IN) != 0 || m == NULL) {               \
2517                                 BRIDGE_UNLOCK(sc);                      \
2518                                 return (NULL);                          \
2519                         }                                               \
2520                 }                                                       \
2521                 if ((iface) != bifp)                                    \
2522                         ETHER_BPF_MTAP(iface, m);                       \
2523                 BRIDGE_UNLOCK(sc);                                      \
2524                 return (m);                                             \
2525         }                                                               \
2526                                                                         \
2527         /* We just received a packet that we sent out. */               \
2528         if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2529             OR_CARP_CHECK_WE_ARE_SRC((iface))                   \
2530             ) {                                                         \
2531                 BRIDGE_UNLOCK(sc);                                      \
2532                 m_freem(m);                                             \
2533                 return (NULL);                                          \
2534         }
2535
2536         /*
2537          * Unicast.  Make sure it's not for the bridge.
2538          */
2539         do { GRAB_OUR_PACKETS(bifp) } while (0);
2540
2541         /*
2542          * Give a chance for ifp at first priority. This will help when the
2543          * packet comes through the interface like VLAN's with the same MACs
2544          * on several interfaces from the same bridge. This also will save
2545          * some CPU cycles in case the destination interface and the input
2546          * interface (eq ifp) are the same.
2547          */
2548         do { GRAB_OUR_PACKETS(ifp) } while (0);
2549
2550         /* Now check the all bridge members. */
2551         CK_LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2552                 GRAB_OUR_PACKETS(bif2->bif_ifp)
2553         }
2554
2555 #undef OR_CARP_CHECK_WE_ARE_DST
2556 #undef OR_CARP_CHECK_WE_ARE_SRC
2557 #undef OR_PFIL_HOOKED_INET6
2558 #undef GRAB_OUR_PACKETS
2559
2560         /* Perform the bridge forwarding function. */
2561         bridge_forward(sc, bif, m);
2562
2563         return (NULL);
2564 }
2565
2566 /*
2567  * bridge_broadcast:
2568  *
2569  *      Send a frame to all interfaces that are members of
2570  *      the bridge, except for the one on which the packet
2571  *      arrived.
2572  *
2573  *      NOTE: Releases the lock on return.
2574  */
2575 static void
2576 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2577     struct mbuf *m, int runfilt)
2578 {
2579         struct bridge_iflist *dbif, *sbif;
2580         struct mbuf *mc;
2581         struct ifnet *dst_if;
2582         int error = 0, used = 0, i;
2583
2584         sbif = bridge_lookup_member_if(sc, src_if);
2585
2586         BRIDGE_LOCK2REF(sc, error);
2587         if (error) {
2588                 m_freem(m);
2589                 return;
2590         }
2591
2592         /* Filter on the bridge interface before broadcasting */
2593         if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head)
2594 #ifdef INET6
2595             || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2596 #endif
2597             )) {
2598                 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2599                         goto out;
2600                 if (m == NULL)
2601                         goto out;
2602         }
2603
2604         CK_LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2605                 dst_if = dbif->bif_ifp;
2606                 if (dst_if == src_if)
2607                         continue;
2608
2609                 /* Private segments can not talk to each other */
2610                 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2611                         continue;
2612
2613                 if ((dbif->bif_flags & IFBIF_STP) &&
2614                     dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2615                         continue;
2616
2617                 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2618                     (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2619                         continue;
2620
2621                 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2622                         continue;
2623
2624                 if (CK_LIST_NEXT(dbif, bif_next) == NULL) {
2625                         mc = m;
2626                         used = 1;
2627                 } else {
2628                         mc = m_dup(m, M_NOWAIT);
2629                         if (mc == NULL) {
2630                                 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2631                                 continue;
2632                         }
2633                 }
2634
2635                 /*
2636                  * Filter on the output interface. Pass a NULL bridge interface
2637                  * pointer so we do not redundantly filter on the bridge for
2638                  * each interface we broadcast on.
2639                  */
2640                 if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head)
2641 #ifdef INET6
2642                     || PFIL_HOOKED_OUT(V_inet6_pfil_head)
2643 #endif
2644                     )) {
2645                         if (used == 0) {
2646                                 /* Keep the layer3 header aligned */
2647                                 i = min(mc->m_pkthdr.len, max_protohdr);
2648                                 mc = m_copyup(mc, i, ETHER_ALIGN);
2649                                 if (mc == NULL) {
2650                                         if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2651                                         continue;
2652                                 }
2653                         }
2654                         if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2655                                 continue;
2656                         if (mc == NULL)
2657                                 continue;
2658                 }
2659
2660                 bridge_enqueue(sc, dst_if, mc);
2661         }
2662         if (used == 0)
2663                 m_freem(m);
2664
2665 out:
2666         BRIDGE_UNREF(sc);
2667 }
2668
2669 /*
2670  * bridge_span:
2671  *
2672  *      Duplicate a packet out one or more interfaces that are in span mode,
2673  *      the original mbuf is unmodified.
2674  */
2675 static void
2676 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2677 {
2678         struct bridge_iflist *bif;
2679         struct ifnet *dst_if;
2680         struct mbuf *mc;
2681
2682         if (CK_LIST_EMPTY(&sc->sc_spanlist))
2683                 return;
2684
2685         CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2686                 dst_if = bif->bif_ifp;
2687
2688                 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2689                         continue;
2690
2691                 mc = m_copypacket(m, M_NOWAIT);
2692                 if (mc == NULL) {
2693                         if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2694                         continue;
2695                 }
2696
2697                 bridge_enqueue(sc, dst_if, mc);
2698         }
2699 }
2700
2701 /*
2702  * bridge_rtupdate:
2703  *
2704  *      Add a bridge routing entry.
2705  */
2706 static int
2707 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2708     struct bridge_iflist *bif, int setflags, uint8_t flags)
2709 {
2710         struct bridge_rtnode *brt;
2711         int error;
2712
2713         BRIDGE_LOCK_ASSERT(sc);
2714
2715         /* Check the source address is valid and not multicast. */
2716         if (ETHER_IS_MULTICAST(dst) ||
2717             (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2718              dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2719                 return (EINVAL);
2720
2721         /* 802.1p frames map to vlan 1 */
2722         if (vlan == 0)
2723                 vlan = 1;
2724
2725         /*
2726          * A route for this destination might already exist.  If so,
2727          * update it, otherwise create a new one.
2728          */
2729         if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2730                 if (sc->sc_brtcnt >= sc->sc_brtmax) {
2731                         sc->sc_brtexceeded++;
2732                         return (ENOSPC);
2733                 }
2734                 /* Check per interface address limits (if enabled) */
2735                 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2736                         bif->bif_addrexceeded++;
2737                         return (ENOSPC);
2738                 }
2739
2740                 /*
2741                  * Allocate a new bridge forwarding node, and
2742                  * initialize the expiration time and Ethernet
2743                  * address.
2744                  */
2745                 brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2746                 if (brt == NULL)
2747                         return (ENOMEM);
2748
2749                 if (bif->bif_flags & IFBIF_STICKY)
2750                         brt->brt_flags = IFBAF_STICKY;
2751                 else
2752                         brt->brt_flags = IFBAF_DYNAMIC;
2753
2754                 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2755                 brt->brt_vlan = vlan;
2756
2757                 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2758                         uma_zfree(V_bridge_rtnode_zone, brt);
2759                         return (error);
2760                 }
2761                 brt->brt_dst = bif;
2762                 bif->bif_addrcnt++;
2763         }
2764
2765         if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2766             brt->brt_dst != bif) {
2767                 brt->brt_dst->bif_addrcnt--;
2768                 brt->brt_dst = bif;
2769                 brt->brt_dst->bif_addrcnt++;
2770         }
2771
2772         if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2773                 brt->brt_expire = time_uptime + sc->sc_brttimeout;
2774         if (setflags)
2775                 brt->brt_flags = flags;
2776
2777         return (0);
2778 }
2779
2780 /*
2781  * bridge_rtlookup:
2782  *
2783  *      Lookup the destination interface for an address.
2784  */
2785 static struct ifnet *
2786 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2787 {
2788         struct bridge_rtnode *brt;
2789
2790         BRIDGE_LOCK_ASSERT(sc);
2791
2792         if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2793                 return (NULL);
2794
2795         return (brt->brt_ifp);
2796 }
2797
2798 /*
2799  * bridge_rttrim:
2800  *
2801  *      Trim the routine table so that we have a number
2802  *      of routing entries less than or equal to the
2803  *      maximum number.
2804  */
2805 static void
2806 bridge_rttrim(struct bridge_softc *sc)
2807 {
2808         struct bridge_rtnode *brt, *nbrt;
2809
2810         BRIDGE_LOCK_ASSERT(sc);
2811
2812         /* Make sure we actually need to do this. */
2813         if (sc->sc_brtcnt <= sc->sc_brtmax)
2814                 return;
2815
2816         /* Force an aging cycle; this might trim enough addresses. */
2817         bridge_rtage(sc);
2818         if (sc->sc_brtcnt <= sc->sc_brtmax)
2819                 return;
2820
2821         CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2822                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2823                         bridge_rtnode_destroy(sc, brt);
2824                         if (sc->sc_brtcnt <= sc->sc_brtmax)
2825                                 return;
2826                 }
2827         }
2828 }
2829
2830 /*
2831  * bridge_timer:
2832  *
2833  *      Aging timer for the bridge.
2834  */
2835 static void
2836 bridge_timer(void *arg)
2837 {
2838         struct bridge_softc *sc = arg;
2839
2840         BRIDGE_LOCK_ASSERT(sc);
2841
2842         /* Destruction of rtnodes requires a proper vnet context */
2843         CURVNET_SET(sc->sc_ifp->if_vnet);
2844         bridge_rtage(sc);
2845
2846         if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2847                 callout_reset(&sc->sc_brcallout,
2848                     bridge_rtable_prune_period * hz, bridge_timer, sc);
2849         CURVNET_RESTORE();
2850 }
2851
2852 /*
2853  * bridge_rtage:
2854  *
2855  *      Perform an aging cycle.
2856  */
2857 static void
2858 bridge_rtage(struct bridge_softc *sc)
2859 {
2860         struct bridge_rtnode *brt, *nbrt;
2861
2862         BRIDGE_LOCK_ASSERT(sc);
2863
2864         CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2865                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2866                         if (time_uptime >= brt->brt_expire)
2867                                 bridge_rtnode_destroy(sc, brt);
2868                 }
2869         }
2870 }
2871
2872 /*
2873  * bridge_rtflush:
2874  *
2875  *      Remove all dynamic addresses from the bridge.
2876  */
2877 static void
2878 bridge_rtflush(struct bridge_softc *sc, int full)
2879 {
2880         struct bridge_rtnode *brt, *nbrt;
2881
2882         BRIDGE_LOCK_ASSERT(sc);
2883
2884         CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2885                 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2886                         bridge_rtnode_destroy(sc, brt);
2887         }
2888 }
2889
2890 /*
2891  * bridge_rtdaddr:
2892  *
2893  *      Remove an address from the table.
2894  */
2895 static int
2896 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2897 {
2898         struct bridge_rtnode *brt;
2899         int found = 0;
2900
2901         BRIDGE_LOCK_ASSERT(sc);
2902
2903         /*
2904          * If vlan is zero then we want to delete for all vlans so the lookup
2905          * may return more than one.
2906          */
2907         while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
2908                 bridge_rtnode_destroy(sc, brt);
2909                 found = 1;
2910         }
2911
2912         return (found ? 0 : ENOENT);
2913 }
2914
2915 /*
2916  * bridge_rtdelete:
2917  *
2918  *      Delete routes to a speicifc member interface.
2919  */
2920 static void
2921 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2922 {
2923         struct bridge_rtnode *brt, *nbrt;
2924
2925         BRIDGE_LOCK_ASSERT(sc);
2926
2927         CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2928                 if (brt->brt_ifp == ifp && (full ||
2929                             (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2930                         bridge_rtnode_destroy(sc, brt);
2931         }
2932 }
2933
2934 /*
2935  * bridge_rtable_init:
2936  *
2937  *      Initialize the route table for this bridge.
2938  */
2939 static void
2940 bridge_rtable_init(struct bridge_softc *sc)
2941 {
2942         int i;
2943
2944         sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
2945             M_DEVBUF, M_WAITOK);
2946
2947         for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
2948                 CK_LIST_INIT(&sc->sc_rthash[i]);
2949
2950         sc->sc_rthash_key = arc4random();
2951         CK_LIST_INIT(&sc->sc_rtlist);
2952 }
2953
2954 /*
2955  * bridge_rtable_fini:
2956  *
2957  *      Deconstruct the route table for this bridge.
2958  */
2959 static void
2960 bridge_rtable_fini(struct bridge_softc *sc)
2961 {
2962
2963         KASSERT(sc->sc_brtcnt == 0,
2964             ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
2965         free(sc->sc_rthash, M_DEVBUF);
2966 }
2967
2968 /*
2969  * The following hash function is adapted from "Hash Functions" by Bob Jenkins
2970  * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
2971  */
2972 #define mix(a, b, c)                                                    \
2973 do {                                                                    \
2974         a -= b; a -= c; a ^= (c >> 13);                                 \
2975         b -= c; b -= a; b ^= (a << 8);                                  \
2976         c -= a; c -= b; c ^= (b >> 13);                                 \
2977         a -= b; a -= c; a ^= (c >> 12);                                 \
2978         b -= c; b -= a; b ^= (a << 16);                                 \
2979         c -= a; c -= b; c ^= (b >> 5);                                  \
2980         a -= b; a -= c; a ^= (c >> 3);                                  \
2981         b -= c; b -= a; b ^= (a << 10);                                 \
2982         c -= a; c -= b; c ^= (b >> 15);                                 \
2983 } while (/*CONSTCOND*/0)
2984
2985 static __inline uint32_t
2986 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
2987 {
2988         uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
2989
2990         b += addr[5] << 8;
2991         b += addr[4];
2992         a += addr[3] << 24;
2993         a += addr[2] << 16;
2994         a += addr[1] << 8;
2995         a += addr[0];
2996
2997         mix(a, b, c);
2998
2999         return (c & BRIDGE_RTHASH_MASK);
3000 }
3001
3002 #undef mix
3003
3004 static int
3005 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
3006 {
3007         int i, d;
3008
3009         for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
3010                 d = ((int)a[i]) - ((int)b[i]);
3011         }
3012
3013         return (d);
3014 }
3015
3016 /*
3017  * bridge_rtnode_lookup:
3018  *
3019  *      Look up a bridge route node for the specified destination. Compare the
3020  *      vlan id or if zero then just return the first match.
3021  */
3022 static struct bridge_rtnode *
3023 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
3024 {
3025         struct bridge_rtnode *brt;
3026         uint32_t hash;
3027         int dir;
3028
3029         BRIDGE_LOCK_ASSERT(sc);
3030
3031         hash = bridge_rthash(sc, addr);
3032         CK_LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
3033                 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
3034                 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
3035                         return (brt);
3036                 if (dir > 0)
3037                         return (NULL);
3038         }
3039
3040         return (NULL);
3041 }
3042
3043 /*
3044  * bridge_rtnode_insert:
3045  *
3046  *      Insert the specified bridge node into the route table.  We
3047  *      assume the entry is not already in the table.
3048  */
3049 static int
3050 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
3051 {
3052         struct bridge_rtnode *lbrt;
3053         uint32_t hash;
3054         int dir;
3055
3056         BRIDGE_LOCK_ASSERT(sc);
3057
3058         hash = bridge_rthash(sc, brt->brt_addr);
3059
3060         lbrt = CK_LIST_FIRST(&sc->sc_rthash[hash]);
3061         if (lbrt == NULL) {
3062                 CK_LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
3063                 goto out;
3064         }
3065
3066         do {
3067                 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
3068                 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
3069                         return (EEXIST);
3070                 if (dir > 0) {
3071                         CK_LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
3072                         goto out;
3073                 }
3074                 if (CK_LIST_NEXT(lbrt, brt_hash) == NULL) {
3075                         CK_LIST_INSERT_AFTER(lbrt, brt, brt_hash);
3076                         goto out;
3077                 }
3078                 lbrt = CK_LIST_NEXT(lbrt, brt_hash);
3079         } while (lbrt != NULL);
3080
3081 #ifdef DIAGNOSTIC
3082         panic("bridge_rtnode_insert: impossible");
3083 #endif
3084
3085 out:
3086         CK_LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
3087         sc->sc_brtcnt++;
3088
3089         return (0);
3090 }
3091
3092 /*
3093  * bridge_rtnode_destroy:
3094  *
3095  *      Destroy a bridge rtnode.
3096  */
3097 static void
3098 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
3099 {
3100         BRIDGE_LOCK_ASSERT(sc);
3101
3102         CK_LIST_REMOVE(brt, brt_hash);
3103
3104         CK_LIST_REMOVE(brt, brt_list);
3105         sc->sc_brtcnt--;
3106         brt->brt_dst->bif_addrcnt--;
3107         uma_zfree(V_bridge_rtnode_zone, brt);
3108 }
3109
3110 /*
3111  * bridge_rtable_expire:
3112  *
3113  *      Set the expiry time for all routes on an interface.
3114  */
3115 static void
3116 bridge_rtable_expire(struct ifnet *ifp, int age)
3117 {
3118         struct bridge_softc *sc = ifp->if_bridge;
3119         struct bridge_rtnode *brt;
3120
3121         CURVNET_SET(ifp->if_vnet);
3122         BRIDGE_LOCK(sc);
3123
3124         /*
3125          * If the age is zero then flush, otherwise set all the expiry times to
3126          * age for the interface
3127          */
3128         if (age == 0)
3129                 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
3130         else {
3131                 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
3132                         /* Cap the expiry time to 'age' */
3133                         if (brt->brt_ifp == ifp &&
3134                             brt->brt_expire > time_uptime + age &&
3135                             (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
3136                                 brt->brt_expire = time_uptime + age;
3137                 }
3138         }
3139         BRIDGE_UNLOCK(sc);
3140         CURVNET_RESTORE();
3141 }
3142
3143 /*
3144  * bridge_state_change:
3145  *
3146  *      Callback from the bridgestp code when a port changes states.
3147  */
3148 static void
3149 bridge_state_change(struct ifnet *ifp, int state)
3150 {
3151         struct bridge_softc *sc = ifp->if_bridge;
3152         static const char *stpstates[] = {
3153                 "disabled",
3154                 "listening",
3155                 "learning",
3156                 "forwarding",
3157                 "blocking",
3158                 "discarding"
3159         };
3160
3161         CURVNET_SET(ifp->if_vnet);
3162         if (V_log_stp)
3163                 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
3164                     sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
3165         CURVNET_RESTORE();
3166 }
3167
3168 /*
3169  * Send bridge packets through pfil if they are one of the types pfil can deal
3170  * with, or if they are ARP or REVARP.  (pfil will pass ARP and REVARP without
3171  * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
3172  * that interface.
3173  */
3174 static int
3175 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
3176 {
3177         int snap, error, i, hlen;
3178         struct ether_header *eh1, eh2;
3179         struct ip *ip;
3180         struct llc llc1;
3181         u_int16_t ether_type;
3182         pfil_return_t rv;
3183
3184         snap = 0;
3185         error = -1;     /* Default error if not error == 0 */
3186
3187 #if 0
3188         /* we may return with the IP fields swapped, ensure its not shared */
3189         KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
3190 #endif
3191
3192         if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0)
3193                 return (0); /* filtering is disabled */
3194
3195         i = min((*mp)->m_pkthdr.len, max_protohdr);
3196         if ((*mp)->m_len < i) {
3197             *mp = m_pullup(*mp, i);
3198             if (*mp == NULL) {
3199                 printf("%s: m_pullup failed\n", __func__);
3200                 return (-1);
3201             }
3202         }
3203
3204         eh1 = mtod(*mp, struct ether_header *);
3205         ether_type = ntohs(eh1->ether_type);
3206
3207         /*
3208          * Check for SNAP/LLC.
3209          */
3210         if (ether_type < ETHERMTU) {
3211                 struct llc *llc2 = (struct llc *)(eh1 + 1);
3212
3213                 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3214                     llc2->llc_dsap == LLC_SNAP_LSAP &&
3215                     llc2->llc_ssap == LLC_SNAP_LSAP &&
3216                     llc2->llc_control == LLC_UI) {
3217                         ether_type = htons(llc2->llc_un.type_snap.ether_type);
3218                         snap = 1;
3219                 }
3220         }
3221
3222         /*
3223          * If we're trying to filter bridge traffic, don't look at anything
3224          * other than IP and ARP traffic.  If the filter doesn't understand
3225          * IPv6, don't allow IPv6 through the bridge either.  This is lame
3226          * since if we really wanted, say, an AppleTalk filter, we are hosed,
3227          * but of course we don't have an AppleTalk filter to begin with.
3228          * (Note that since pfil doesn't understand ARP it will pass *ALL*
3229          * ARP traffic.)
3230          */
3231         switch (ether_type) {
3232                 case ETHERTYPE_ARP:
3233                 case ETHERTYPE_REVARP:
3234                         if (V_pfil_ipfw_arp == 0)
3235                                 return (0); /* Automatically pass */
3236                         break;
3237
3238                 case ETHERTYPE_IP:
3239 #ifdef INET6
3240                 case ETHERTYPE_IPV6:
3241 #endif /* INET6 */
3242                         break;
3243                 default:
3244                         /*
3245                          * Check to see if the user wants to pass non-ip
3246                          * packets, these will not be checked by pfil(9) and
3247                          * passed unconditionally so the default is to drop.
3248                          */
3249                         if (V_pfil_onlyip)
3250                                 goto bad;
3251         }
3252
3253         /* Run the packet through pfil before stripping link headers */
3254         if (PFIL_HOOKED_OUT(V_link_pfil_head) && V_pfil_ipfw != 0 &&
3255             dir == PFIL_OUT && ifp != NULL) {
3256                 switch (pfil_run_hooks(V_link_pfil_head, mp, ifp, dir, NULL)) {
3257                 case PFIL_DROPPED:
3258                         return (EACCES);
3259                 case PFIL_CONSUMED:
3260                         return (0);
3261                 }
3262         }
3263
3264         /* Strip off the Ethernet header and keep a copy. */
3265         m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3266         m_adj(*mp, ETHER_HDR_LEN);
3267
3268         /* Strip off snap header, if present */
3269         if (snap) {
3270                 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3271                 m_adj(*mp, sizeof(struct llc));
3272         }
3273
3274         /*
3275          * Check the IP header for alignment and errors
3276          */
3277         if (dir == PFIL_IN) {
3278                 switch (ether_type) {
3279                         case ETHERTYPE_IP:
3280                                 error = bridge_ip_checkbasic(mp);
3281                                 break;
3282 #ifdef INET6
3283                         case ETHERTYPE_IPV6:
3284                                 error = bridge_ip6_checkbasic(mp);
3285                                 break;
3286 #endif /* INET6 */
3287                         default:
3288                                 error = 0;
3289                 }
3290                 if (error)
3291                         goto bad;
3292         }
3293
3294         error = 0;
3295
3296         /*
3297          * Run the packet through pfil
3298          */
3299         rv = PFIL_PASS;
3300         switch (ether_type) {
3301         case ETHERTYPE_IP:
3302                 /*
3303                  * Run pfil on the member interface and the bridge, both can
3304                  * be skipped by clearing pfil_member or pfil_bridge.
3305                  *
3306                  * Keep the order:
3307                  *   in_if -> bridge_if -> out_if
3308                  */
3309                 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv =
3310                     pfil_run_hooks(V_inet_pfil_head, mp, bifp, dir, NULL)) !=
3311                     PFIL_PASS)
3312                         break;
3313
3314                 if (V_pfil_member && ifp != NULL && (rv =
3315                     pfil_run_hooks(V_inet_pfil_head, mp, ifp, dir, NULL)) !=
3316                     PFIL_PASS)
3317                         break;
3318
3319                 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv =
3320                     pfil_run_hooks(V_inet_pfil_head, mp, bifp, dir, NULL)) !=
3321                     PFIL_PASS)
3322                         break;
3323
3324                 /* check if we need to fragment the packet */
3325                 /* bridge_fragment generates a mbuf chain of packets */
3326                 /* that already include eth headers */
3327                 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) {
3328                         i = (*mp)->m_pkthdr.len;
3329                         if (i > ifp->if_mtu) {
3330                                 error = bridge_fragment(ifp, mp, &eh2, snap,
3331                                             &llc1);
3332                                 return (error);
3333                         }
3334                 }
3335
3336                 /* Recalculate the ip checksum. */
3337                 ip = mtod(*mp, struct ip *);
3338                 hlen = ip->ip_hl << 2;
3339                 if (hlen < sizeof(struct ip))
3340                         goto bad;
3341                 if (hlen > (*mp)->m_len) {
3342                         if ((*mp = m_pullup(*mp, hlen)) == NULL)
3343                                 goto bad;
3344                         ip = mtod(*mp, struct ip *);
3345                         if (ip == NULL)
3346                                 goto bad;
3347                 }
3348                 ip->ip_sum = 0;
3349                 if (hlen == sizeof(struct ip))
3350                         ip->ip_sum = in_cksum_hdr(ip);
3351                 else
3352                         ip->ip_sum = in_cksum(*mp, hlen);
3353
3354                 break;
3355 #ifdef INET6
3356         case ETHERTYPE_IPV6:
3357                 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv =
3358                     pfil_run_hooks(V_inet6_pfil_head, mp, bifp, dir, NULL)) !=
3359                     PFIL_PASS)
3360                         break;
3361
3362                 if (V_pfil_member && ifp != NULL && (rv =
3363                     pfil_run_hooks(V_inet6_pfil_head, mp, ifp, dir, NULL)) !=
3364                     PFIL_PASS)
3365                         break;
3366
3367                 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv =
3368                     pfil_run_hooks(V_inet6_pfil_head, mp, bifp, dir, NULL)) !=
3369                     PFIL_PASS)
3370                         break;
3371                 break;
3372 #endif
3373         }
3374
3375         switch (rv) {
3376         case PFIL_CONSUMED:
3377                 return (0);
3378         case PFIL_DROPPED:
3379                 return (EACCES);
3380         default:
3381                 break;
3382         }
3383
3384         error = -1;
3385
3386         /*
3387          * Finally, put everything back the way it was and return
3388          */
3389         if (snap) {
3390                 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT);
3391                 if (*mp == NULL)
3392                         return (error);
3393                 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3394         }
3395
3396         M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT);
3397         if (*mp == NULL)
3398                 return (error);
3399         bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3400
3401         return (0);
3402
3403 bad:
3404         m_freem(*mp);
3405         *mp = NULL;
3406         return (error);
3407 }
3408
3409 /*
3410  * Perform basic checks on header size since
3411  * pfil assumes ip_input has already processed
3412  * it for it.  Cut-and-pasted from ip_input.c.
3413  * Given how simple the IPv6 version is,
3414  * does the IPv4 version really need to be
3415  * this complicated?
3416  *
3417  * XXX Should we update ipstat here, or not?
3418  * XXX Right now we update ipstat but not
3419  * XXX csum_counter.
3420  */
3421 static int
3422 bridge_ip_checkbasic(struct mbuf **mp)
3423 {
3424         struct mbuf *m = *mp;
3425         struct ip *ip;
3426         int len, hlen;
3427         u_short sum;
3428
3429         if (*mp == NULL)
3430                 return (-1);
3431
3432         if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3433                 if ((m = m_copyup(m, sizeof(struct ip),
3434                         (max_linkhdr + 3) & ~3)) == NULL) {
3435                         /* XXXJRT new stat, please */
3436                         KMOD_IPSTAT_INC(ips_toosmall);
3437                         goto bad;
3438                 }
3439         } else if (__predict_false(m->m_len < sizeof (struct ip))) {
3440                 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3441                         KMOD_IPSTAT_INC(ips_toosmall);
3442                         goto bad;
3443                 }
3444         }
3445         ip = mtod(m, struct ip *);
3446         if (ip == NULL) goto bad;
3447
3448         if (ip->ip_v != IPVERSION) {
3449                 KMOD_IPSTAT_INC(ips_badvers);
3450                 goto bad;
3451         }
3452         hlen = ip->ip_hl << 2;
3453         if (hlen < sizeof(struct ip)) { /* minimum header length */
3454                 KMOD_IPSTAT_INC(ips_badhlen);
3455                 goto bad;
3456         }
3457         if (hlen > m->m_len) {
3458                 if ((m = m_pullup(m, hlen)) == NULL) {
3459                         KMOD_IPSTAT_INC(ips_badhlen);
3460                         goto bad;
3461                 }
3462                 ip = mtod(m, struct ip *);
3463                 if (ip == NULL) goto bad;
3464         }
3465
3466         if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3467                 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3468         } else {
3469                 if (hlen == sizeof(struct ip)) {
3470                         sum = in_cksum_hdr(ip);
3471                 } else {
3472                         sum = in_cksum(m, hlen);
3473                 }
3474         }
3475         if (sum) {
3476                 KMOD_IPSTAT_INC(ips_badsum);
3477                 goto bad;
3478         }
3479
3480         /* Retrieve the packet length. */
3481         len = ntohs(ip->ip_len);
3482
3483         /*
3484          * Check for additional length bogosity
3485          */
3486         if (len < hlen) {
3487                 KMOD_IPSTAT_INC(ips_badlen);
3488                 goto bad;
3489         }
3490
3491         /*
3492          * Check that the amount of data in the buffers
3493          * is as at least much as the IP header would have us expect.
3494          * Drop packet if shorter than we expect.
3495          */
3496         if (m->m_pkthdr.len < len) {
3497                 KMOD_IPSTAT_INC(ips_tooshort);
3498                 goto bad;
3499         }
3500
3501         /* Checks out, proceed */
3502         *mp = m;
3503         return (0);
3504
3505 bad:
3506         *mp = m;
3507         return (-1);
3508 }
3509
3510 #ifdef INET6
3511 /*
3512  * Same as above, but for IPv6.
3513  * Cut-and-pasted from ip6_input.c.
3514  * XXX Should we update ip6stat, or not?
3515  */
3516 static int
3517 bridge_ip6_checkbasic(struct mbuf **mp)
3518 {
3519         struct mbuf *m = *mp;
3520         struct ip6_hdr *ip6;
3521
3522         /*
3523          * If the IPv6 header is not aligned, slurp it up into a new
3524          * mbuf with space for link headers, in the event we forward
3525          * it.  Otherwise, if it is aligned, make sure the entire base
3526          * IPv6 header is in the first mbuf of the chain.
3527          */
3528         if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3529                 struct ifnet *inifp = m->m_pkthdr.rcvif;
3530                 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3531                             (max_linkhdr + 3) & ~3)) == NULL) {
3532                         /* XXXJRT new stat, please */
3533                         IP6STAT_INC(ip6s_toosmall);
3534                         in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3535                         goto bad;
3536                 }
3537         } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3538                 struct ifnet *inifp = m->m_pkthdr.rcvif;
3539                 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3540                         IP6STAT_INC(ip6s_toosmall);
3541                         in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3542                         goto bad;
3543                 }
3544         }
3545
3546         ip6 = mtod(m, struct ip6_hdr *);
3547
3548         if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3549                 IP6STAT_INC(ip6s_badvers);
3550                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3551                 goto bad;
3552         }
3553
3554         /* Checks out, proceed */
3555         *mp = m;
3556         return (0);
3557
3558 bad:
3559         *mp = m;
3560         return (-1);
3561 }
3562 #endif /* INET6 */
3563
3564 /*
3565  * bridge_fragment:
3566  *
3567  *      Fragment mbuf chain in multiple packets and prepend ethernet header.
3568  */
3569 static int
3570 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh,
3571     int snap, struct llc *llc)
3572 {
3573         struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL;
3574         struct ip *ip;
3575         int error = -1;
3576
3577         if (m->m_len < sizeof(struct ip) &&
3578             (m = m_pullup(m, sizeof(struct ip))) == NULL)
3579                 goto dropit;
3580         ip = mtod(m, struct ip *);
3581
3582         m->m_pkthdr.csum_flags |= CSUM_IP;
3583         error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist);
3584         if (error)
3585                 goto dropit;
3586
3587         /*
3588          * Walk the chain and re-add the Ethernet header for
3589          * each mbuf packet.
3590          */
3591         for (mcur = m; mcur; mcur = mcur->m_nextpkt) {
3592                 nextpkt = mcur->m_nextpkt;
3593                 mcur->m_nextpkt = NULL;
3594                 if (snap) {
3595                         M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT);
3596                         if (mcur == NULL) {
3597                                 error = ENOBUFS;
3598                                 if (mprev != NULL)
3599                                         mprev->m_nextpkt = nextpkt;
3600                                 goto dropit;
3601                         }
3602                         bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc));
3603                 }
3604
3605                 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT);
3606                 if (mcur == NULL) {
3607                         error = ENOBUFS;
3608                         if (mprev != NULL)
3609                                 mprev->m_nextpkt = nextpkt;
3610                         goto dropit;
3611                 }
3612                 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN);
3613
3614                 /*
3615                  * The previous two M_PREPEND could have inserted one or two
3616                  * mbufs in front so we have to update the previous packet's
3617                  * m_nextpkt.
3618                  */
3619                 mcur->m_nextpkt = nextpkt;
3620                 if (mprev != NULL)
3621                         mprev->m_nextpkt = mcur;
3622                 else {
3623                         /* The first mbuf in the original chain needs to be
3624                          * updated. */
3625                         *mp = mcur;
3626                 }
3627                 mprev = mcur;
3628         }
3629
3630         KMOD_IPSTAT_INC(ips_fragmented);
3631         return (error);
3632
3633 dropit:
3634         for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */
3635                 m = mcur->m_nextpkt;
3636                 m_freem(mcur);
3637         }
3638         return (error);
3639 }
3640
3641 static void
3642 bridge_linkstate(struct ifnet *ifp)
3643 {
3644         struct bridge_softc *sc = ifp->if_bridge;
3645         struct bridge_iflist *bif;
3646
3647         BRIDGE_LOCK(sc);
3648         bif = bridge_lookup_member_if(sc, ifp);
3649         if (bif == NULL) {
3650                 BRIDGE_UNLOCK(sc);
3651                 return;
3652         }
3653         bridge_linkcheck(sc);
3654         BRIDGE_UNLOCK(sc);
3655
3656         bstp_linkstate(&bif->bif_stp);
3657 }
3658
3659 static void
3660 bridge_linkcheck(struct bridge_softc *sc)
3661 {
3662         struct bridge_iflist *bif;
3663         int new_link, hasls;
3664
3665         BRIDGE_LOCK_ASSERT(sc);
3666         new_link = LINK_STATE_DOWN;
3667         hasls = 0;
3668         /* Our link is considered up if at least one of our ports is active */
3669         CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
3670                 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
3671                         hasls++;
3672                 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
3673                         new_link = LINK_STATE_UP;
3674                         break;
3675                 }
3676         }
3677         if (!CK_LIST_EMPTY(&sc->sc_iflist) && !hasls) {
3678                 /* If no interfaces support link-state then we default to up */
3679                 new_link = LINK_STATE_UP;
3680         }
3681         if_link_state_change(sc->sc_ifp, new_link);
3682 }