sys/net/if_bridge.c

   1 /*      $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $       */
   2
   3 /*
   4  * Copyright 2001 Wasabi Systems, Inc.
   5  * All rights reserved.
   6  *
   7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed for the NetBSD Project by
  20  *      Wasabi Systems, Inc.
  21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
  22  *    or promote products derived from this software without specific prior
  23  *    written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
  29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  35  * POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 /*
  39  * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net)
  40  * All rights reserved.
  41  *
  42  * Redistribution and use in source and binary forms, with or without
  43  * modification, are permitted provided that the following conditions
  44  * are met:
  45  * 1. Redistributions of source code must retain the above copyright
  46  *    notice, this list of conditions and the following disclaimer.
  47  * 2. Redistributions in binary form must reproduce the above copyright
  48  *    notice, this list of conditions and the following disclaimer in the
  49  *    documentation and/or other materials provided with the distribution.
  50  *
  51  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  52  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  53  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  54  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  55  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  56  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  57  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  58  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  59  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  60  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  61  * POSSIBILITY OF SUCH DAMAGE.
  62  *
  63  * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp
  64  */
  65
  66 /*
  67  * Network interface bridge support.
  68  *
  69  * TODO:
  70  *
  71  *      - Currently only supports Ethernet-like interfaces (Ethernet,
  72  *        802.11, VLANs on Ethernet, etc.)  Figure out a nice way
  73  *        to bridge other types of interfaces (FDDI-FDDI, and maybe
  74  *        consider heterogenous bridges).
  75  */
  76
  77 #include <sys/cdefs.h>
  78 __FBSDID("$FreeBSD$");
  79
  80 #include "opt_inet.h"
  81 #include "opt_inet6.h"
  82
  83 #include <sys/param.h>
  84 #include <sys/mbuf.h>
  85 #include <sys/malloc.h>
  86 #include <sys/protosw.h>
  87 #include <sys/systm.h>
  88 #include <sys/jail.h>
  89 #include <sys/time.h>
  90 #include <sys/socket.h> /* for net/if.h */
  91 #include <sys/sockio.h>
  92 #include <sys/ctype.h>  /* string functions */
  93 #include <sys/kernel.h>
  94 #include <sys/random.h>
  95 #include <sys/syslog.h>
  96 #include <sys/sysctl.h>
  97 #include <vm/uma.h>
  98 #include <sys/module.h>
  99 #include <sys/priv.h>
 100 #include <sys/proc.h>
 101 #include <sys/lock.h>
 102 #include <sys/mutex.h>
 103
 104 #include <net/bpf.h>
 105 #include <net/if.h>
 106 #include <net/if_clone.h>
 107 #include <net/if_dl.h>
 108 #include <net/if_types.h>
 109 #include <net/if_var.h>
 110 #include <net/pfil.h>
 111 #include <net/vnet.h>
 112
 113 #include <netinet/in.h> /* for struct arpcom */
 114 #include <netinet/in_systm.h>
 115 #include <netinet/in_var.h>
 116 #include <netinet/ip.h>
 117 #include <netinet/ip_var.h>
 118 #ifdef INET6
 119 #include <netinet/ip6.h>
 120 #include <netinet6/ip6_var.h>
 121 #include <netinet6/in6_ifattach.h>
 122 #endif
 123 #if defined(INET) || defined(INET6)
 124 #include <netinet/ip_carp.h>
 125 #endif
 126 #include <machine/in_cksum.h>
 127 #include <netinet/if_ether.h> /* for struct arpcom */
 128 #include <net/bridgestp.h>
 129 #include <net/if_bridgevar.h>
 130 #include <net/if_llc.h>
 131 #include <net/if_vlan_var.h>
 132
 133 #include <net/route.h>
 134
 135 /*
 136  * Size of the route hash table.  Must be a power of two.
 137  */
 138 #ifndef BRIDGE_RTHASH_SIZE
 139 #define BRIDGE_RTHASH_SIZE              1024
 140 #endif
 141
 142 #define BRIDGE_RTHASH_MASK              (BRIDGE_RTHASH_SIZE - 1)
 143
 144 /*
 145  * Default maximum number of addresses to cache.
 146  */
 147 #ifndef BRIDGE_RTABLE_MAX
 148 #define BRIDGE_RTABLE_MAX               2000
 149 #endif
 150
 151 /*
 152  * Timeout (in seconds) for entries learned dynamically.
 153  */
 154 #ifndef BRIDGE_RTABLE_TIMEOUT
 155 #define BRIDGE_RTABLE_TIMEOUT           (20 * 60)       /* same as ARP */
 156 #endif
 157
 158 /*
 159  * Number of seconds between walks of the route list.
 160  */
 161 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
 162 #define BRIDGE_RTABLE_PRUNE_PERIOD      (5 * 60)
 163 #endif
 164
 165 /*
 166  * List of capabilities to possibly mask on the member interface.
 167  */
 168 #define BRIDGE_IFCAPS_MASK              (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\
 169                                          IFCAP_TXCSUM_IPV6)
 170
 171 /*
 172  * List of capabilities to strip
 173  */
 174 #define BRIDGE_IFCAPS_STRIP             IFCAP_LRO
 175
 176 /*
 177  * Bridge interface list entry.
 178  */
 179 struct bridge_iflist {
 180         LIST_ENTRY(bridge_iflist) bif_next;
 181         struct ifnet            *bif_ifp;       /* member if */
 182         struct bstp_port        bif_stp;        /* STP state */
 183         uint32_t                bif_flags;      /* member if flags */
 184         int                     bif_savedcaps;  /* saved capabilities */
 185         uint32_t                bif_addrmax;    /* max # of addresses */
 186         uint32_t                bif_addrcnt;    /* cur. # of addresses */
 187         uint32_t                bif_addrexceeded;/* # of address violations */
 188 };
 189
 190 /*
 191  * Bridge route node.
 192  */
 193 struct bridge_rtnode {
 194         LIST_ENTRY(bridge_rtnode) brt_hash;     /* hash table linkage */
 195         LIST_ENTRY(bridge_rtnode) brt_list;     /* list linkage */
 196         struct bridge_iflist    *brt_dst;       /* destination if */
 197         unsigned long           brt_expire;     /* expiration time */
 198         uint8_t                 brt_flags;      /* address flags */
 199         uint8_t                 brt_addr[ETHER_ADDR_LEN];
 200         uint16_t                brt_vlan;       /* vlan id */
 201 };
 202 #define brt_ifp                 brt_dst->bif_ifp
 203
 204 /*
 205  * Software state for each bridge.
 206  */
 207 struct bridge_softc {
 208         struct ifnet            *sc_ifp;        /* make this an interface */
 209         LIST_ENTRY(bridge_softc) sc_list;
 210         struct mtx              sc_mtx;
 211         struct cv               sc_cv;
 212         uint32_t                sc_brtmax;      /* max # of addresses */
 213         uint32_t                sc_brtcnt;      /* cur. # of addresses */
 214         uint32_t                sc_brttimeout;  /* rt timeout in seconds */
 215         struct callout          sc_brcallout;   /* bridge callout */
 216         uint32_t                sc_iflist_ref;  /* refcount for sc_iflist */
 217         uint32_t                sc_iflist_xcnt; /* refcount for sc_iflist */
 218         LIST_HEAD(, bridge_iflist) sc_iflist;   /* member interface list */
 219         LIST_HEAD(, bridge_rtnode) *sc_rthash;  /* our forwarding table */
 220         LIST_HEAD(, bridge_rtnode) sc_rtlist;   /* list version of above */
 221         uint32_t                sc_rthash_key;  /* key for hash */
 222         LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */
 223         struct bstp_state       sc_stp;         /* STP state */
 224         uint32_t                sc_brtexceeded; /* # of cache drops */
 225         struct ifnet            *sc_ifaddr;     /* member mac copied from */
 226         u_char                  sc_defaddr[6];  /* Default MAC address */
 227 };
 228
 229 static struct mtx       bridge_list_mtx;
 230 eventhandler_tag        bridge_detach_cookie = NULL;
 231
 232 int     bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
 233
 234 uma_zone_t bridge_rtnode_zone;
 235
 236 static int      bridge_clone_create(struct if_clone *, int, caddr_t);
 237 static void     bridge_clone_destroy(struct ifnet *);
 238
 239 static int      bridge_ioctl(struct ifnet *, u_long, caddr_t);
 240 static void     bridge_mutecaps(struct bridge_softc *);
 241 static void     bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
 242                     int);
 243 static void     bridge_ifdetach(void *arg __unused, struct ifnet *);
 244 static void     bridge_init(void *);
 245 static void     bridge_dummynet(struct mbuf *, struct ifnet *);
 246 static void     bridge_stop(struct ifnet *, int);
 247 static int      bridge_transmit(struct ifnet *, struct mbuf *);
 248 static void     bridge_qflush(struct ifnet *);
 249 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
 250 static int      bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
 251                     struct rtentry *);
 252 static int      bridge_enqueue(struct bridge_softc *, struct ifnet *,
 253                     struct mbuf *);
 254 static void     bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
 255
 256 static void     bridge_forward(struct bridge_softc *, struct bridge_iflist *,
 257                     struct mbuf *m);
 258
 259 static void     bridge_timer(void *);
 260
 261 static void     bridge_broadcast(struct bridge_softc *, struct ifnet *,
 262                     struct mbuf *, int);
 263 static void     bridge_span(struct bridge_softc *, struct mbuf *);
 264
 265 static int      bridge_rtupdate(struct bridge_softc *, const uint8_t *,
 266                     uint16_t, struct bridge_iflist *, int, uint8_t);
 267 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
 268                     uint16_t);
 269 static void     bridge_rttrim(struct bridge_softc *);
 270 static void     bridge_rtage(struct bridge_softc *);
 271 static void     bridge_rtflush(struct bridge_softc *, int);
 272 static int      bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
 273                     uint16_t);
 274
 275 static void     bridge_rtable_init(struct bridge_softc *);
 276 static void     bridge_rtable_fini(struct bridge_softc *);
 277
 278 static int      bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
 279 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
 280                     const uint8_t *, uint16_t);
 281 static int      bridge_rtnode_insert(struct bridge_softc *,
 282                     struct bridge_rtnode *);
 283 static void     bridge_rtnode_destroy(struct bridge_softc *,
 284                     struct bridge_rtnode *);
 285 static void     bridge_rtable_expire(struct ifnet *, int);
 286 static void     bridge_state_change(struct ifnet *, int);
 287
 288 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
 289                     const char *name);
 290 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
 291                     struct ifnet *ifp);
 292 static void     bridge_delete_member(struct bridge_softc *,
 293                     struct bridge_iflist *, int);
 294 static void     bridge_delete_span(struct bridge_softc *,
 295                     struct bridge_iflist *);
 296
 297 static int      bridge_ioctl_add(struct bridge_softc *, void *);
 298 static int      bridge_ioctl_del(struct bridge_softc *, void *);
 299 static int      bridge_ioctl_gifflags(struct bridge_softc *, void *);
 300 static int      bridge_ioctl_sifflags(struct bridge_softc *, void *);
 301 static int      bridge_ioctl_scache(struct bridge_softc *, void *);
 302 static int      bridge_ioctl_gcache(struct bridge_softc *, void *);
 303 static int      bridge_ioctl_gifs(struct bridge_softc *, void *);
 304 static int      bridge_ioctl_rts(struct bridge_softc *, void *);
 305 static int      bridge_ioctl_saddr(struct bridge_softc *, void *);
 306 static int      bridge_ioctl_sto(struct bridge_softc *, void *);
 307 static int      bridge_ioctl_gto(struct bridge_softc *, void *);
 308 static int      bridge_ioctl_daddr(struct bridge_softc *, void *);
 309 static int      bridge_ioctl_flush(struct bridge_softc *, void *);
 310 static int      bridge_ioctl_gpri(struct bridge_softc *, void *);
 311 static int      bridge_ioctl_spri(struct bridge_softc *, void *);
 312 static int      bridge_ioctl_ght(struct bridge_softc *, void *);
 313 static int      bridge_ioctl_sht(struct bridge_softc *, void *);
 314 static int      bridge_ioctl_gfd(struct bridge_softc *, void *);
 315 static int      bridge_ioctl_sfd(struct bridge_softc *, void *);
 316 static int      bridge_ioctl_gma(struct bridge_softc *, void *);
 317 static int      bridge_ioctl_sma(struct bridge_softc *, void *);
 318 static int      bridge_ioctl_sifprio(struct bridge_softc *, void *);
 319 static int      bridge_ioctl_sifcost(struct bridge_softc *, void *);
 320 static int      bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
 321 static int      bridge_ioctl_addspan(struct bridge_softc *, void *);
 322 static int      bridge_ioctl_delspan(struct bridge_softc *, void *);
 323 static int      bridge_ioctl_gbparam(struct bridge_softc *, void *);
 324 static int      bridge_ioctl_grte(struct bridge_softc *, void *);
 325 static int      bridge_ioctl_gifsstp(struct bridge_softc *, void *);
 326 static int      bridge_ioctl_sproto(struct bridge_softc *, void *);
 327 static int      bridge_ioctl_stxhc(struct bridge_softc *, void *);
 328 static int      bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
 329                     int);
 330 static int      bridge_ip_checkbasic(struct mbuf **mp);
 331 #ifdef INET6
 332 static int      bridge_ip6_checkbasic(struct mbuf **mp);
 333 #endif /* INET6 */
 334 static int      bridge_fragment(struct ifnet *, struct mbuf **mp,
 335                     struct ether_header *, int, struct llc *);
 336 static void     bridge_linkstate(struct ifnet *ifp);
 337 static void     bridge_linkcheck(struct bridge_softc *sc);
 338
 339 extern void (*bridge_linkstate_p)(struct ifnet *ifp);
 340
 341 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
 342 #define VLANTAGOF(_m)   \
 343     (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
 344
 345 static struct bstp_cb_ops bridge_ops = {
 346         .bcb_state = bridge_state_change,
 347         .bcb_rtage = bridge_rtable_expire
 348 };
 349
 350 SYSCTL_DECL(_net_link);
 351 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
 352
 353 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */
 354 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */
 355 static int pfil_member = 1; /* run pfil hooks on the member interface */
 356 static int pfil_ipfw = 0;   /* layer2 filter with ipfw */
 357 static int pfil_ipfw_arp = 0;   /* layer2 filter with ipfw */
 358 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for
 359                                    locally destined packets */
 360 static int log_stp   = 0;   /* log STP state changes */
 361 static int bridge_inherit_mac = 0;   /* share MAC with first bridge member */
 362 TUNABLE_INT("net.link.bridge.pfil_onlyip", &pfil_onlyip);
 363 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW,
 364     &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled");
 365 TUNABLE_INT("net.link.bridge.ipfw_arp", &pfil_ipfw_arp);
 366 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW,
 367     &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2");
 368 TUNABLE_INT("net.link.bridge.pfil_bridge", &pfil_bridge);
 369 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW,
 370     &pfil_bridge, 0, "Packet filter on the bridge interface");
 371 TUNABLE_INT("net.link.bridge.pfil_member", &pfil_member);
 372 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW,
 373     &pfil_member, 0, "Packet filter on the member interface");
 374 TUNABLE_INT("net.link.bridge.pfil_local_phys", &pfil_local_phys);
 375 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW,
 376     &pfil_local_phys, 0,
 377     "Packet filter on the physical interface for locally destined packets");
 378 TUNABLE_INT("net.link.bridge.log_stp", &log_stp);
 379 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW,
 380     &log_stp, 0, "Log STP state changes");
 381 TUNABLE_INT("net.link.bridge.inherit_mac", &bridge_inherit_mac);
 382 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW,
 383     &bridge_inherit_mac, 0,
 384     "Inherit MAC address from the first bridge member");
 385
 386 static VNET_DEFINE(int, allow_llz_overlap) = 0;
 387 #define V_allow_llz_overlap     VNET(allow_llz_overlap)
 388 SYSCTL_VNET_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, CTLFLAG_RW,
 389     &VNET_NAME(allow_llz_overlap), 0, "Allow overlap of link-local scope "
 390     "zones of a bridge interface and the member interfaces");
 391
 392 struct bridge_control {
 393         int     (*bc_func)(struct bridge_softc *, void *);
 394         int     bc_argsize;
 395         int     bc_flags;
 396 };
 397
 398 #define BC_F_COPYIN             0x01    /* copy arguments in */
 399 #define BC_F_COPYOUT            0x02    /* copy arguments out */
 400 #define BC_F_SUSER              0x04    /* do super-user check */
 401
 402 const struct bridge_control bridge_control_table[] = {
 403         { bridge_ioctl_add,             sizeof(struct ifbreq),
 404           BC_F_COPYIN|BC_F_SUSER },
 405         { bridge_ioctl_del,             sizeof(struct ifbreq),
 406           BC_F_COPYIN|BC_F_SUSER },
 407
 408         { bridge_ioctl_gifflags,        sizeof(struct ifbreq),
 409           BC_F_COPYIN|BC_F_COPYOUT },
 410         { bridge_ioctl_sifflags,        sizeof(struct ifbreq),
 411           BC_F_COPYIN|BC_F_SUSER },
 412
 413         { bridge_ioctl_scache,          sizeof(struct ifbrparam),
 414           BC_F_COPYIN|BC_F_SUSER },
 415         { bridge_ioctl_gcache,          sizeof(struct ifbrparam),
 416           BC_F_COPYOUT },
 417
 418         { bridge_ioctl_gifs,            sizeof(struct ifbifconf),
 419           BC_F_COPYIN|BC_F_COPYOUT },
 420         { bridge_ioctl_rts,             sizeof(struct ifbaconf),
 421           BC_F_COPYIN|BC_F_COPYOUT },
 422
 423         { bridge_ioctl_saddr,           sizeof(struct ifbareq),
 424           BC_F_COPYIN|BC_F_SUSER },
 425
 426         { bridge_ioctl_sto,             sizeof(struct ifbrparam),
 427           BC_F_COPYIN|BC_F_SUSER },
 428         { bridge_ioctl_gto,             sizeof(struct ifbrparam),
 429           BC_F_COPYOUT },
 430
 431         { bridge_ioctl_daddr,           sizeof(struct ifbareq),
 432           BC_F_COPYIN|BC_F_SUSER },
 433
 434         { bridge_ioctl_flush,           sizeof(struct ifbreq),
 435           BC_F_COPYIN|BC_F_SUSER },
 436
 437         { bridge_ioctl_gpri,            sizeof(struct ifbrparam),
 438           BC_F_COPYOUT },
 439         { bridge_ioctl_spri,            sizeof(struct ifbrparam),
 440           BC_F_COPYIN|BC_F_SUSER },
 441
 442         { bridge_ioctl_ght,             sizeof(struct ifbrparam),
 443           BC_F_COPYOUT },
 444         { bridge_ioctl_sht,             sizeof(struct ifbrparam),
 445           BC_F_COPYIN|BC_F_SUSER },
 446
 447         { bridge_ioctl_gfd,             sizeof(struct ifbrparam),
 448           BC_F_COPYOUT },
 449         { bridge_ioctl_sfd,             sizeof(struct ifbrparam),
 450           BC_F_COPYIN|BC_F_SUSER },
 451
 452         { bridge_ioctl_gma,             sizeof(struct ifbrparam),
 453           BC_F_COPYOUT },
 454         { bridge_ioctl_sma,             sizeof(struct ifbrparam),
 455           BC_F_COPYIN|BC_F_SUSER },
 456
 457         { bridge_ioctl_sifprio,         sizeof(struct ifbreq),
 458           BC_F_COPYIN|BC_F_SUSER },
 459
 460         { bridge_ioctl_sifcost,         sizeof(struct ifbreq),
 461           BC_F_COPYIN|BC_F_SUSER },
 462
 463         { bridge_ioctl_addspan,         sizeof(struct ifbreq),
 464           BC_F_COPYIN|BC_F_SUSER },
 465         { bridge_ioctl_delspan,         sizeof(struct ifbreq),
 466           BC_F_COPYIN|BC_F_SUSER },
 467
 468         { bridge_ioctl_gbparam,         sizeof(struct ifbropreq),
 469           BC_F_COPYOUT },
 470
 471         { bridge_ioctl_grte,            sizeof(struct ifbrparam),
 472           BC_F_COPYOUT },
 473
 474         { bridge_ioctl_gifsstp,         sizeof(struct ifbpstpconf),
 475           BC_F_COPYIN|BC_F_COPYOUT },
 476
 477         { bridge_ioctl_sproto,          sizeof(struct ifbrparam),
 478           BC_F_COPYIN|BC_F_SUSER },
 479
 480         { bridge_ioctl_stxhc,           sizeof(struct ifbrparam),
 481           BC_F_COPYIN|BC_F_SUSER },
 482
 483         { bridge_ioctl_sifmaxaddr,      sizeof(struct ifbreq),
 484           BC_F_COPYIN|BC_F_SUSER },
 485
 486 };
 487 const int bridge_control_table_size =
 488     sizeof(bridge_control_table) / sizeof(bridge_control_table[0]);
 489
 490 LIST_HEAD(, bridge_softc) bridge_list;
 491
 492 static struct if_clone *bridge_cloner;
 493 static const char bridge_name[] = "bridge";
 494
 495 static int
 496 bridge_modevent(module_t mod, int type, void *data)
 497 {
 498
 499         switch (type) {
 500         case MOD_LOAD:
 501                 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF);
 502                 bridge_cloner = if_clone_simple(bridge_name,
 503                     bridge_clone_create, bridge_clone_destroy, 0);
 504                 bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
 505                     sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
 506                     UMA_ALIGN_PTR, 0);
 507                 LIST_INIT(&bridge_list);
 508                 bridge_input_p = bridge_input;
 509                 bridge_output_p = bridge_output;
 510                 bridge_dn_p = bridge_dummynet;
 511                 bridge_linkstate_p = bridge_linkstate;
 512                 bridge_detach_cookie = EVENTHANDLER_REGISTER(
 513                     ifnet_departure_event, bridge_ifdetach, NULL,
 514                     EVENTHANDLER_PRI_ANY);
 515                 break;
 516         case MOD_UNLOAD:
 517                 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
 518                     bridge_detach_cookie);
 519                 if_clone_detach(bridge_cloner);
 520                 uma_zdestroy(bridge_rtnode_zone);
 521                 bridge_input_p = NULL;
 522                 bridge_output_p = NULL;
 523                 bridge_dn_p = NULL;
 524                 bridge_linkstate_p = NULL;
 525                 mtx_destroy(&bridge_list_mtx);
 526                 break;
 527         default:
 528                 return (EOPNOTSUPP);
 529         }
 530         return (0);
 531 }
 532
 533 static moduledata_t bridge_mod = {
 534         "if_bridge",
 535         bridge_modevent,
 536         0
 537 };
 538
 539 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
 540 MODULE_VERSION(if_bridge, 1);
 541 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
 542
 543 /*
 544  * handler for net.link.bridge.ipfw
 545  */
 546 static int
 547 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
 548 {
 549         int enable = pfil_ipfw;
 550         int error;
 551
 552         error = sysctl_handle_int(oidp, &enable, 0, req);
 553         enable = (enable) ? 1 : 0;
 554
 555         if (enable != pfil_ipfw) {
 556                 pfil_ipfw = enable;
 557
 558                 /*
 559                  * Disable pfil so that ipfw doesnt run twice, if the user
 560                  * really wants both then they can re-enable pfil_bridge and/or
 561                  * pfil_member. Also allow non-ip packets as ipfw can filter by
 562                  * layer2 type.
 563                  */
 564                 if (pfil_ipfw) {
 565                         pfil_onlyip = 0;
 566                         pfil_bridge = 0;
 567                         pfil_member = 0;
 568                 }
 569         }
 570
 571         return (error);
 572 }
 573 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW,
 574             &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW");
 575
 576 /*
 577  * bridge_clone_create:
 578  *
 579  *      Create a new bridge instance.
 580  */
 581 static int
 582 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
 583 {
 584         struct bridge_softc *sc, *sc2;
 585         struct ifnet *bifp, *ifp;
 586         int fb, retry;
 587         unsigned long hostid;
 588
 589         sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
 590         ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
 591         if (ifp == NULL) {
 592                 free(sc, M_DEVBUF);
 593                 return (ENOSPC);
 594         }
 595
 596         BRIDGE_LOCK_INIT(sc);
 597         sc->sc_brtmax = BRIDGE_RTABLE_MAX;
 598         sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
 599
 600         /* Initialize our routing table. */
 601         bridge_rtable_init(sc);
 602
 603         callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
 604
 605         LIST_INIT(&sc->sc_iflist);
 606         LIST_INIT(&sc->sc_spanlist);
 607
 608         ifp->if_softc = sc;
 609         if_initname(ifp, bridge_name, unit);
 610         ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
 611         ifp->if_ioctl = bridge_ioctl;
 612         ifp->if_transmit = bridge_transmit;
 613         ifp->if_qflush = bridge_qflush;
 614         ifp->if_init = bridge_init;
 615         ifp->if_type = IFT_BRIDGE;
 616
 617         /*
 618          * Generate an ethernet address with a locally administered address.
 619          *
 620          * Since we are using random ethernet addresses for the bridge, it is
 621          * possible that we might have address collisions, so make sure that
 622          * this hardware address isn't already in use on another bridge.
 623          * The first try uses the hostid and falls back to arc4rand().
 624          */
 625         fb = 0;
 626         getcredhostid(curthread->td_ucred, &hostid);
 627         do {
 628                 if (fb || hostid == 0) {
 629                         arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1);
 630                         sc->sc_defaddr[0] &= ~1;/* clear multicast bit */
 631                         sc->sc_defaddr[0] |= 2; /* set the LAA bit */
 632                 } else {
 633                         sc->sc_defaddr[0] = 0x2;
 634                         sc->sc_defaddr[1] = (hostid >> 24) & 0xff;
 635                         sc->sc_defaddr[2] = (hostid >> 16) & 0xff;
 636                         sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff;
 637                         sc->sc_defaddr[4] =  hostid        & 0xff;
 638                         sc->sc_defaddr[5] = ifp->if_dunit & 0xff;
 639                 }
 640
 641                 fb = 1;
 642                 retry = 0;
 643                 mtx_lock(&bridge_list_mtx);
 644                 LIST_FOREACH(sc2, &bridge_list, sc_list) {
 645                         bifp = sc2->sc_ifp;
 646                         if (memcmp(sc->sc_defaddr,
 647                             IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) {
 648                                 retry = 1;
 649                                 break;
 650                         }
 651                 }
 652                 mtx_unlock(&bridge_list_mtx);
 653         } while (retry == 1);
 654
 655         bstp_attach(&sc->sc_stp, &bridge_ops);
 656         ether_ifattach(ifp, sc->sc_defaddr);
 657         /* Now undo some of the damage... */
 658         ifp->if_baudrate = 0;
 659         ifp->if_type = IFT_BRIDGE;
 660
 661         mtx_lock(&bridge_list_mtx);
 662         LIST_INSERT_HEAD(&bridge_list, sc, sc_list);
 663         mtx_unlock(&bridge_list_mtx);
 664
 665         return (0);
 666 }
 667
 668 /*
 669  * bridge_clone_destroy:
 670  *
 671  *      Destroy a bridge instance.
 672  */
 673 static void
 674 bridge_clone_destroy(struct ifnet *ifp)
 675 {
 676         struct bridge_softc *sc = ifp->if_softc;
 677         struct bridge_iflist *bif;
 678
 679         BRIDGE_LOCK(sc);
 680
 681         bridge_stop(ifp, 1);
 682         ifp->if_flags &= ~IFF_UP;
 683
 684         while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
 685                 bridge_delete_member(sc, bif, 0);
 686
 687         while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
 688                 bridge_delete_span(sc, bif);
 689         }
 690
 691         BRIDGE_UNLOCK(sc);
 692
 693         callout_drain(&sc->sc_brcallout);
 694
 695         mtx_lock(&bridge_list_mtx);
 696         LIST_REMOVE(sc, sc_list);
 697         mtx_unlock(&bridge_list_mtx);
 698
 699         bstp_detach(&sc->sc_stp);
 700         ether_ifdetach(ifp);
 701         if_free(ifp);
 702
 703         /* Tear down the routing table. */
 704         bridge_rtable_fini(sc);
 705
 706         BRIDGE_LOCK_DESTROY(sc);
 707         free(sc, M_DEVBUF);
 708 }
 709
 710 /*
 711  * bridge_ioctl:
 712  *
 713  *      Handle a control request from the operator.
 714  */
 715 static int
 716 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
 717 {
 718         struct bridge_softc *sc = ifp->if_softc;
 719         struct ifreq *ifr = (struct ifreq *)data;
 720         struct bridge_iflist *bif;
 721         struct thread *td = curthread;
 722         union {
 723                 struct ifbreq ifbreq;
 724                 struct ifbifconf ifbifconf;
 725                 struct ifbareq ifbareq;
 726                 struct ifbaconf ifbaconf;
 727                 struct ifbrparam ifbrparam;
 728                 struct ifbropreq ifbropreq;
 729         } args;
 730         struct ifdrv *ifd = (struct ifdrv *) data;
 731         const struct bridge_control *bc;
 732         int error = 0;
 733
 734         switch (cmd) {
 735
 736         case SIOCADDMULTI:
 737         case SIOCDELMULTI:
 738                 break;
 739
 740         case SIOCGDRVSPEC:
 741         case SIOCSDRVSPEC:
 742                 if (ifd->ifd_cmd >= bridge_control_table_size) {
 743                         error = EINVAL;
 744                         break;
 745                 }
 746                 bc = &bridge_control_table[ifd->ifd_cmd];
 747
 748                 if (cmd == SIOCGDRVSPEC &&
 749                     (bc->bc_flags & BC_F_COPYOUT) == 0) {
 750                         error = EINVAL;
 751                         break;
 752                 }
 753                 else if (cmd == SIOCSDRVSPEC &&
 754                     (bc->bc_flags & BC_F_COPYOUT) != 0) {
 755                         error = EINVAL;
 756                         break;
 757                 }
 758
 759                 if (bc->bc_flags & BC_F_SUSER) {
 760                         error = priv_check(td, PRIV_NET_BRIDGE);
 761                         if (error)
 762                                 break;
 763                 }
 764
 765                 if (ifd->ifd_len != bc->bc_argsize ||
 766                     ifd->ifd_len > sizeof(args)) {
 767                         error = EINVAL;
 768                         break;
 769                 }
 770
 771                 bzero(&args, sizeof(args));
 772                 if (bc->bc_flags & BC_F_COPYIN) {
 773                         error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
 774                         if (error)
 775                                 break;
 776                 }
 777
 778                 BRIDGE_LOCK(sc);
 779                 error = (*bc->bc_func)(sc, &args);
 780                 BRIDGE_UNLOCK(sc);
 781                 if (error)
 782                         break;
 783
 784                 if (bc->bc_flags & BC_F_COPYOUT)
 785                         error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
 786
 787                 break;
 788
 789         case SIOCSIFFLAGS:
 790                 if (!(ifp->if_flags & IFF_UP) &&
 791                     (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 792                         /*
 793                          * If interface is marked down and it is running,
 794                          * then stop and disable it.
 795                          */
 796                         BRIDGE_LOCK(sc);
 797                         bridge_stop(ifp, 1);
 798                         BRIDGE_UNLOCK(sc);
 799                 } else if ((ifp->if_flags & IFF_UP) &&
 800                     !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 801                         /*
 802                          * If interface is marked up and it is stopped, then
 803                          * start it.
 804                          */
 805                         (*ifp->if_init)(sc);
 806                 }
 807                 break;
 808
 809         case SIOCSIFMTU:
 810                 if (ifr->ifr_mtu < 576) {
 811                         error = EINVAL;
 812                         break;
 813                 }
 814                 if (LIST_EMPTY(&sc->sc_iflist)) {
 815                         sc->sc_ifp->if_mtu = ifr->ifr_mtu;
 816                         break;
 817                 }
 818                 BRIDGE_LOCK(sc);
 819                 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 820                         if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) {
 821                                 log(LOG_NOTICE, "%s: invalid MTU: %lu(%s)"
 822                                     " != %d\n", sc->sc_ifp->if_xname,
 823                                     bif->bif_ifp->if_mtu,
 824                                     bif->bif_ifp->if_xname, ifr->ifr_mtu);
 825                                 error = EINVAL;
 826                                 break;
 827                         }
 828                 }
 829                 if (!error)
 830                         sc->sc_ifp->if_mtu = ifr->ifr_mtu;
 831                 BRIDGE_UNLOCK(sc);
 832                 break;
 833         default:
 834                 /*
 835                  * drop the lock as ether_ioctl() will call bridge_start() and
 836                  * cause the lock to be recursed.
 837                  */
 838                 error = ether_ioctl(ifp, cmd, data);
 839                 break;
 840         }
 841
 842         return (error);
 843 }
 844
 845 /*
 846  * bridge_mutecaps:
 847  *
 848  *      Clear or restore unwanted capabilities on the member interface
 849  */
 850 static void
 851 bridge_mutecaps(struct bridge_softc *sc)
 852 {
 853         struct bridge_iflist *bif;
 854         int enabled, mask;
 855
 856         /* Initial bitmask of capabilities to test */
 857         mask = BRIDGE_IFCAPS_MASK;
 858
 859         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 860                 /* Every member must support it or its disabled */
 861                 mask &= bif->bif_savedcaps;
 862         }
 863
 864         BRIDGE_XLOCK(sc);
 865         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 866                 enabled = bif->bif_ifp->if_capenable;
 867                 enabled &= ~BRIDGE_IFCAPS_STRIP;
 868                 /* strip off mask bits and enable them again if allowed */
 869                 enabled &= ~BRIDGE_IFCAPS_MASK;
 870                 enabled |= mask;
 871                 BRIDGE_UNLOCK(sc);
 872                 bridge_set_ifcap(sc, bif, enabled);
 873                 BRIDGE_LOCK(sc);
 874         }
 875         BRIDGE_XDROP(sc);
 876
 877 }
 878
 879 static void
 880 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
 881 {
 882         struct ifnet *ifp = bif->bif_ifp;
 883         struct ifreq ifr;
 884         int error;
 885
 886         BRIDGE_UNLOCK_ASSERT(sc);
 887
 888         bzero(&ifr, sizeof(ifr));
 889         ifr.ifr_reqcap = set;
 890
 891         if (ifp->if_capenable != set) {
 892                 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
 893                 if (error)
 894                         if_printf(sc->sc_ifp,
 895                             "error setting interface capabilities on %s\n",
 896                             ifp->if_xname);
 897         }
 898 }
 899
 900 /*
 901  * bridge_lookup_member:
 902  *
 903  *      Lookup a bridge member interface.
 904  */
 905 static struct bridge_iflist *
 906 bridge_lookup_member(struct bridge_softc *sc, const char *name)
 907 {
 908         struct bridge_iflist *bif;
 909         struct ifnet *ifp;
 910
 911         BRIDGE_LOCK_ASSERT(sc);
 912
 913         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 914                 ifp = bif->bif_ifp;
 915                 if (strcmp(ifp->if_xname, name) == 0)
 916                         return (bif);
 917         }
 918
 919         return (NULL);
 920 }
 921
 922 /*
 923  * bridge_lookup_member_if:
 924  *
 925  *      Lookup a bridge member interface by ifnet*.
 926  */
 927 static struct bridge_iflist *
 928 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
 929 {
 930         struct bridge_iflist *bif;
 931
 932         BRIDGE_LOCK_ASSERT(sc);
 933
 934         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 935                 if (bif->bif_ifp == member_ifp)
 936                         return (bif);
 937         }
 938
 939         return (NULL);
 940 }
 941
 942 /*
 943  * bridge_delete_member:
 944  *
 945  *      Delete the specified member interface.
 946  */
 947 static void
 948 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
 949     int gone)
 950 {
 951         struct ifnet *ifs = bif->bif_ifp;
 952         struct ifnet *fif = NULL;
 953
 954         BRIDGE_LOCK_ASSERT(sc);
 955
 956         if (bif->bif_flags & IFBIF_STP)
 957                 bstp_disable(&bif->bif_stp);
 958
 959         ifs->if_bridge = NULL;
 960         BRIDGE_XLOCK(sc);
 961         LIST_REMOVE(bif, bif_next);
 962         BRIDGE_XDROP(sc);
 963
 964         /*
 965          * If removing the interface that gave the bridge its mac address, set
 966          * the mac address of the bridge to the address of the next member, or
 967          * to its default address if no members are left.
 968          */
 969         if (bridge_inherit_mac && sc->sc_ifaddr == ifs) {
 970                 if (LIST_EMPTY(&sc->sc_iflist)) {
 971                         bcopy(sc->sc_defaddr,
 972                             IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
 973                         sc->sc_ifaddr = NULL;
 974                 } else {
 975                         fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp;
 976                         bcopy(IF_LLADDR(fif),
 977                             IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
 978                         sc->sc_ifaddr = fif;
 979                 }
 980                 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
 981         }
 982
 983         bridge_linkcheck(sc);
 984         bridge_mutecaps(sc);    /* recalcuate now this interface is removed */
 985         bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
 986         KASSERT(bif->bif_addrcnt == 0,
 987             ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
 988
 989         BRIDGE_UNLOCK(sc);
 990         if (!gone) {
 991                 switch (ifs->if_type) {
 992                 case IFT_ETHER:
 993                 case IFT_L2VLAN:
 994                         /*
 995                          * Take the interface out of promiscuous mode, but only
 996                          * if it was promiscuous in the first place. It might
 997                          * not be if we're in the bridge_ioctl_add() error path.
 998                          */
 999                         if (ifs->if_flags & IFF_PROMISC)
1000                                 (void) ifpromisc(ifs, 0);
1001                         break;
1002
1003                 case IFT_GIF:
1004                         break;
1005
1006                 default:
1007 #ifdef DIAGNOSTIC
1008                         panic("bridge_delete_member: impossible");
1009 #endif
1010                         break;
1011                 }
1012                 /* reneable any interface capabilities */
1013                 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
1014         }
1015         bstp_destroy(&bif->bif_stp);    /* prepare to free */
1016         BRIDGE_LOCK(sc);
1017         free(bif, M_DEVBUF);
1018 }
1019
1020 /*
1021  * bridge_delete_span:
1022  *
1023  *      Delete the specified span interface.
1024  */
1025 static void
1026 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1027 {
1028         BRIDGE_LOCK_ASSERT(sc);
1029
1030         KASSERT(bif->bif_ifp->if_bridge == NULL,
1031             ("%s: not a span interface", __func__));
1032
1033         LIST_REMOVE(bif, bif_next);
1034         free(bif, M_DEVBUF);
1035 }
1036
1037 static int
1038 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1039 {
1040         struct ifbreq *req = arg;
1041         struct bridge_iflist *bif = NULL;
1042         struct ifnet *ifs;
1043         int error = 0;
1044
1045         ifs = ifunit(req->ifbr_ifsname);
1046         if (ifs == NULL)
1047                 return (ENOENT);
1048         if (ifs->if_ioctl == NULL)      /* must be supported */
1049                 return (EINVAL);
1050
1051         /* If it's in the span list, it can't be a member. */
1052         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1053                 if (ifs == bif->bif_ifp)
1054                         return (EBUSY);
1055
1056         if (ifs->if_bridge == sc)
1057                 return (EEXIST);
1058
1059         if (ifs->if_bridge != NULL)
1060                 return (EBUSY);
1061
1062         switch (ifs->if_type) {
1063         case IFT_ETHER:
1064         case IFT_L2VLAN:
1065         case IFT_GIF:
1066                 /* permitted interface types */
1067                 break;
1068         default:
1069                 return (EINVAL);
1070         }
1071
1072 #ifdef INET6
1073         /*
1074          * Two valid inet6 addresses with link-local scope must not be
1075          * on the parent interface and the member interfaces at the
1076          * same time.  This restriction is needed to prevent violation
1077          * of link-local scope zone.  Attempts to add a member
1078          * interface which has inet6 addresses when the parent has
1079          * inet6 triggers removal of all inet6 addresses on the member
1080          * interface.
1081          */
1082
1083         /* Check if the parent interface has a link-local scope addr. */
1084         if (V_allow_llz_overlap == 0 &&
1085             in6ifa_llaonifp(sc->sc_ifp) != NULL) {
1086                 /*
1087                  * If any, remove all inet6 addresses from the member
1088                  * interfaces.
1089                  */
1090                 BRIDGE_XLOCK(sc);
1091                 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1092                         if (in6ifa_llaonifp(bif->bif_ifp)) {
1093                                 BRIDGE_UNLOCK(sc);
1094                                 in6_ifdetach(bif->bif_ifp);
1095                                 BRIDGE_LOCK(sc);
1096                                 if_printf(sc->sc_ifp,
1097                                     "IPv6 addresses on %s have been removed "
1098                                     "before adding it as a member to prevent "
1099                                     "IPv6 address scope violation.\n",
1100                                     bif->bif_ifp->if_xname);
1101                         }
1102                 }
1103                 BRIDGE_XDROP(sc);
1104                 if (in6ifa_llaonifp(ifs)) {
1105                         BRIDGE_UNLOCK(sc);
1106                         in6_ifdetach(ifs);
1107                         BRIDGE_LOCK(sc);
1108                         if_printf(sc->sc_ifp,
1109                             "IPv6 addresses on %s have been removed "
1110                             "before adding it as a member to prevent "
1111                             "IPv6 address scope violation.\n",
1112                             ifs->if_xname);
1113                 }
1114         }
1115 #endif
1116         /* Allow the first Ethernet member to define the MTU */
1117         if (LIST_EMPTY(&sc->sc_iflist))
1118                 sc->sc_ifp->if_mtu = ifs->if_mtu;
1119         else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
1120                 if_printf(sc->sc_ifp, "invalid MTU: %lu(%s) != %lu\n",
1121                     ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu);
1122                 return (EINVAL);
1123         }
1124
1125         bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1126         if (bif == NULL)
1127                 return (ENOMEM);
1128
1129         bif->bif_ifp = ifs;
1130         bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1131         bif->bif_savedcaps = ifs->if_capenable;
1132
1133         /*
1134          * Assign the interface's MAC address to the bridge if it's the first
1135          * member and the MAC address of the bridge has not been changed from
1136          * the default randomly generated one.
1137          */
1138         if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) &&
1139             !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) {
1140                 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1141                 sc->sc_ifaddr = ifs;
1142                 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1143         }
1144
1145         ifs->if_bridge = sc;
1146         bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1147         /*
1148          * XXX: XLOCK HERE!?!
1149          *
1150          * NOTE: insert_***HEAD*** should be safe for the traversals.
1151          */
1152         LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1153
1154         /* Set interface capabilities to the intersection set of all members */
1155         bridge_mutecaps(sc);
1156         bridge_linkcheck(sc);
1157
1158         /* Place the interface into promiscuous mode */
1159         switch (ifs->if_type) {
1160                 case IFT_ETHER:
1161                 case IFT_L2VLAN:
1162                         BRIDGE_UNLOCK(sc);
1163                         error = ifpromisc(ifs, 1);
1164                         BRIDGE_LOCK(sc);
1165                         break;
1166         }
1167
1168         if (error)
1169                 bridge_delete_member(sc, bif, 0);
1170         return (error);
1171 }
1172
1173 static int
1174 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1175 {
1176         struct ifbreq *req = arg;
1177         struct bridge_iflist *bif;
1178
1179         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1180         if (bif == NULL)
1181                 return (ENOENT);
1182
1183         bridge_delete_member(sc, bif, 0);
1184
1185         return (0);
1186 }
1187
1188 static int
1189 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1190 {
1191         struct ifbreq *req = arg;
1192         struct bridge_iflist *bif;
1193         struct bstp_port *bp;
1194
1195         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1196         if (bif == NULL)
1197                 return (ENOENT);
1198
1199         bp = &bif->bif_stp;
1200         req->ifbr_ifsflags = bif->bif_flags;
1201         req->ifbr_state = bp->bp_state;
1202         req->ifbr_priority = bp->bp_priority;
1203         req->ifbr_path_cost = bp->bp_path_cost;
1204         req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1205         req->ifbr_proto = bp->bp_protover;
1206         req->ifbr_role = bp->bp_role;
1207         req->ifbr_stpflags = bp->bp_flags;
1208         req->ifbr_addrcnt = bif->bif_addrcnt;
1209         req->ifbr_addrmax = bif->bif_addrmax;
1210         req->ifbr_addrexceeded = bif->bif_addrexceeded;
1211
1212         /* Copy STP state options as flags */
1213         if (bp->bp_operedge)
1214                 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1215         if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1216                 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1217         if (bp->bp_ptp_link)
1218                 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1219         if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1220                 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1221         if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1222                 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1223         if (bp->bp_flags & BSTP_PORT_ADMCOST)
1224                 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1225         return (0);
1226 }
1227
1228 static int
1229 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1230 {
1231         struct ifbreq *req = arg;
1232         struct bridge_iflist *bif;
1233         struct bstp_port *bp;
1234         int error;
1235
1236         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1237         if (bif == NULL)
1238                 return (ENOENT);
1239         bp = &bif->bif_stp;
1240
1241         if (req->ifbr_ifsflags & IFBIF_SPAN)
1242                 /* SPAN is readonly */
1243                 return (EINVAL);
1244
1245         if (req->ifbr_ifsflags & IFBIF_STP) {
1246                 if ((bif->bif_flags & IFBIF_STP) == 0) {
1247                         error = bstp_enable(&bif->bif_stp);
1248                         if (error)
1249                                 return (error);
1250                 }
1251         } else {
1252                 if ((bif->bif_flags & IFBIF_STP) != 0)
1253                         bstp_disable(&bif->bif_stp);
1254         }
1255
1256         /* Pass on STP flags */
1257         bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1258         bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1259         bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1260         bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1261
1262         /* Save the bits relating to the bridge */
1263         bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1264
1265         return (0);
1266 }
1267
1268 static int
1269 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1270 {
1271         struct ifbrparam *param = arg;
1272
1273         sc->sc_brtmax = param->ifbrp_csize;
1274         bridge_rttrim(sc);
1275
1276         return (0);
1277 }
1278
1279 static int
1280 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1281 {
1282         struct ifbrparam *param = arg;
1283
1284         param->ifbrp_csize = sc->sc_brtmax;
1285
1286         return (0);
1287 }
1288
1289 static int
1290 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1291 {
1292         struct ifbifconf *bifc = arg;
1293         struct bridge_iflist *bif;
1294         struct ifbreq breq;
1295         char *buf, *outbuf;
1296         int count, buflen, len, error = 0;
1297
1298         count = 0;
1299         LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1300                 count++;
1301         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1302                 count++;
1303
1304         buflen = sizeof(breq) * count;
1305         if (bifc->ifbic_len == 0) {
1306                 bifc->ifbic_len = buflen;
1307                 return (0);
1308         }
1309         BRIDGE_UNLOCK(sc);
1310         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1311         BRIDGE_LOCK(sc);
1312
1313         count = 0;
1314         buf = outbuf;
1315         len = min(bifc->ifbic_len, buflen);
1316         bzero(&breq, sizeof(breq));
1317         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1318                 if (len < sizeof(breq))
1319                         break;
1320
1321                 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1322                     sizeof(breq.ifbr_ifsname));
1323                 /* Fill in the ifbreq structure */
1324                 error = bridge_ioctl_gifflags(sc, &breq);
1325                 if (error)
1326                         break;
1327                 memcpy(buf, &breq, sizeof(breq));
1328                 count++;
1329                 buf += sizeof(breq);
1330                 len -= sizeof(breq);
1331         }
1332         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1333                 if (len < sizeof(breq))
1334                         break;
1335
1336                 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1337                     sizeof(breq.ifbr_ifsname));
1338                 breq.ifbr_ifsflags = bif->bif_flags;
1339                 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1340                 memcpy(buf, &breq, sizeof(breq));
1341                 count++;
1342                 buf += sizeof(breq);
1343                 len -= sizeof(breq);
1344         }
1345
1346         BRIDGE_UNLOCK(sc);
1347         bifc->ifbic_len = sizeof(breq) * count;
1348         error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1349         BRIDGE_LOCK(sc);
1350         free(outbuf, M_TEMP);
1351         return (error);
1352 }
1353
1354 static int
1355 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1356 {
1357         struct ifbaconf *bac = arg;
1358         struct bridge_rtnode *brt;
1359         struct ifbareq bareq;
1360         char *buf, *outbuf;
1361         int count, buflen, len, error = 0;
1362
1363         if (bac->ifbac_len == 0)
1364                 return (0);
1365
1366         count = 0;
1367         LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1368                 count++;
1369         buflen = sizeof(bareq) * count;
1370
1371         BRIDGE_UNLOCK(sc);
1372         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1373         BRIDGE_LOCK(sc);
1374
1375         count = 0;
1376         buf = outbuf;
1377         len = min(bac->ifbac_len, buflen);
1378         bzero(&bareq, sizeof(bareq));
1379         LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1380                 if (len < sizeof(bareq))
1381                         goto out;
1382                 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1383                     sizeof(bareq.ifba_ifsname));
1384                 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1385                 bareq.ifba_vlan = brt->brt_vlan;
1386                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1387                                 time_uptime < brt->brt_expire)
1388                         bareq.ifba_expire = brt->brt_expire - time_uptime;
1389                 else
1390                         bareq.ifba_expire = 0;
1391                 bareq.ifba_flags = brt->brt_flags;
1392
1393                 memcpy(buf, &bareq, sizeof(bareq));
1394                 count++;
1395                 buf += sizeof(bareq);
1396                 len -= sizeof(bareq);
1397         }
1398 out:
1399         BRIDGE_UNLOCK(sc);
1400         bac->ifbac_len = sizeof(bareq) * count;
1401         error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1402         BRIDGE_LOCK(sc);
1403         free(outbuf, M_TEMP);
1404         return (error);
1405 }
1406
1407 static int
1408 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1409 {
1410         struct ifbareq *req = arg;
1411         struct bridge_iflist *bif;
1412         int error;
1413
1414         bif = bridge_lookup_member(sc, req->ifba_ifsname);
1415         if (bif == NULL)
1416                 return (ENOENT);
1417
1418         error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1419             req->ifba_flags);
1420
1421         return (error);
1422 }
1423
1424 static int
1425 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1426 {
1427         struct ifbrparam *param = arg;
1428
1429         sc->sc_brttimeout = param->ifbrp_ctime;
1430         return (0);
1431 }
1432
1433 static int
1434 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1435 {
1436         struct ifbrparam *param = arg;
1437
1438         param->ifbrp_ctime = sc->sc_brttimeout;
1439         return (0);
1440 }
1441
1442 static int
1443 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1444 {
1445         struct ifbareq *req = arg;
1446
1447         return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
1448 }
1449
1450 static int
1451 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1452 {
1453         struct ifbreq *req = arg;
1454
1455         bridge_rtflush(sc, req->ifbr_ifsflags);
1456         return (0);
1457 }
1458
1459 static int
1460 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1461 {
1462         struct ifbrparam *param = arg;
1463         struct bstp_state *bs = &sc->sc_stp;
1464
1465         param->ifbrp_prio = bs->bs_bridge_priority;
1466         return (0);
1467 }
1468
1469 static int
1470 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1471 {
1472         struct ifbrparam *param = arg;
1473
1474         return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1475 }
1476
1477 static int
1478 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1479 {
1480         struct ifbrparam *param = arg;
1481         struct bstp_state *bs = &sc->sc_stp;
1482
1483         param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1484         return (0);
1485 }
1486
1487 static int
1488 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1489 {
1490         struct ifbrparam *param = arg;
1491
1492         return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1493 }
1494
1495 static int
1496 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1497 {
1498         struct ifbrparam *param = arg;
1499         struct bstp_state *bs = &sc->sc_stp;
1500
1501         param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1502         return (0);
1503 }
1504
1505 static int
1506 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1507 {
1508         struct ifbrparam *param = arg;
1509
1510         return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1511 }
1512
1513 static int
1514 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1515 {
1516         struct ifbrparam *param = arg;
1517         struct bstp_state *bs = &sc->sc_stp;
1518
1519         param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1520         return (0);
1521 }
1522
1523 static int
1524 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1525 {
1526         struct ifbrparam *param = arg;
1527
1528         return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1529 }
1530
1531 static int
1532 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1533 {
1534         struct ifbreq *req = arg;
1535         struct bridge_iflist *bif;
1536
1537         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1538         if (bif == NULL)
1539                 return (ENOENT);
1540
1541         return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1542 }
1543
1544 static int
1545 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1546 {
1547         struct ifbreq *req = arg;
1548         struct bridge_iflist *bif;
1549
1550         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1551         if (bif == NULL)
1552                 return (ENOENT);
1553
1554         return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1555 }
1556
1557 static int
1558 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1559 {
1560         struct ifbreq *req = arg;
1561         struct bridge_iflist *bif;
1562
1563         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1564         if (bif == NULL)
1565                 return (ENOENT);
1566
1567         bif->bif_addrmax = req->ifbr_addrmax;
1568         return (0);
1569 }
1570
1571 static int
1572 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1573 {
1574         struct ifbreq *req = arg;
1575         struct bridge_iflist *bif = NULL;
1576         struct ifnet *ifs;
1577
1578         ifs = ifunit(req->ifbr_ifsname);
1579         if (ifs == NULL)
1580                 return (ENOENT);
1581
1582         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1583                 if (ifs == bif->bif_ifp)
1584                         return (EBUSY);
1585
1586         if (ifs->if_bridge != NULL)
1587                 return (EBUSY);
1588
1589         switch (ifs->if_type) {
1590                 case IFT_ETHER:
1591                 case IFT_GIF:
1592                 case IFT_L2VLAN:
1593                         break;
1594                 default:
1595                         return (EINVAL);
1596         }
1597
1598         bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1599         if (bif == NULL)
1600                 return (ENOMEM);
1601
1602         bif->bif_ifp = ifs;
1603         bif->bif_flags = IFBIF_SPAN;
1604
1605         LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1606
1607         return (0);
1608 }
1609
1610 static int
1611 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1612 {
1613         struct ifbreq *req = arg;
1614         struct bridge_iflist *bif;
1615         struct ifnet *ifs;
1616
1617         ifs = ifunit(req->ifbr_ifsname);
1618         if (ifs == NULL)
1619                 return (ENOENT);
1620
1621         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1622                 if (ifs == bif->bif_ifp)
1623                         break;
1624
1625         if (bif == NULL)
1626                 return (ENOENT);
1627
1628         bridge_delete_span(sc, bif);
1629
1630         return (0);
1631 }
1632
1633 static int
1634 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1635 {
1636         struct ifbropreq *req = arg;
1637         struct bstp_state *bs = &sc->sc_stp;
1638         struct bstp_port *root_port;
1639
1640         req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1641         req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1642         req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1643
1644         root_port = bs->bs_root_port;
1645         if (root_port == NULL)
1646                 req->ifbop_root_port = 0;
1647         else
1648                 req->ifbop_root_port = root_port->bp_ifp->if_index;
1649
1650         req->ifbop_holdcount = bs->bs_txholdcount;
1651         req->ifbop_priority = bs->bs_bridge_priority;
1652         req->ifbop_protocol = bs->bs_protover;
1653         req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1654         req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1655         req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1656         req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1657         req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1658         req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1659
1660         return (0);
1661 }
1662
1663 static int
1664 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1665 {
1666         struct ifbrparam *param = arg;
1667
1668         param->ifbrp_cexceeded = sc->sc_brtexceeded;
1669         return (0);
1670 }
1671
1672 static int
1673 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1674 {
1675         struct ifbpstpconf *bifstp = arg;
1676         struct bridge_iflist *bif;
1677         struct bstp_port *bp;
1678         struct ifbpstpreq bpreq;
1679         char *buf, *outbuf;
1680         int count, buflen, len, error = 0;
1681
1682         count = 0;
1683         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1684                 if ((bif->bif_flags & IFBIF_STP) != 0)
1685                         count++;
1686         }
1687
1688         buflen = sizeof(bpreq) * count;
1689         if (bifstp->ifbpstp_len == 0) {
1690                 bifstp->ifbpstp_len = buflen;
1691                 return (0);
1692         }
1693
1694         BRIDGE_UNLOCK(sc);
1695         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1696         BRIDGE_LOCK(sc);
1697
1698         count = 0;
1699         buf = outbuf;
1700         len = min(bifstp->ifbpstp_len, buflen);
1701         bzero(&bpreq, sizeof(bpreq));
1702         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1703                 if (len < sizeof(bpreq))
1704                         break;
1705
1706                 if ((bif->bif_flags & IFBIF_STP) == 0)
1707                         continue;
1708
1709                 bp = &bif->bif_stp;
1710                 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1711                 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1712                 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1713                 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1714                 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1715                 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1716
1717                 memcpy(buf, &bpreq, sizeof(bpreq));
1718                 count++;
1719                 buf += sizeof(bpreq);
1720                 len -= sizeof(bpreq);
1721         }
1722
1723         BRIDGE_UNLOCK(sc);
1724         bifstp->ifbpstp_len = sizeof(bpreq) * count;
1725         error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1726         BRIDGE_LOCK(sc);
1727         free(outbuf, M_TEMP);
1728         return (error);
1729 }
1730
1731 static int
1732 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1733 {
1734         struct ifbrparam *param = arg;
1735
1736         return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1737 }
1738
1739 static int
1740 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1741 {
1742         struct ifbrparam *param = arg;
1743
1744         return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1745 }
1746
1747 /*
1748  * bridge_ifdetach:
1749  *
1750  *      Detach an interface from a bridge.  Called when a member
1751  *      interface is detaching.
1752  */
1753 static void
1754 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1755 {
1756         struct bridge_softc *sc = ifp->if_bridge;
1757         struct bridge_iflist *bif;
1758
1759         if (ifp->if_flags & IFF_RENAMING)
1760                 return;
1761
1762         /* Check if the interface is a bridge member */
1763         if (sc != NULL) {
1764                 BRIDGE_LOCK(sc);
1765
1766                 bif = bridge_lookup_member_if(sc, ifp);
1767                 if (bif != NULL)
1768                         bridge_delete_member(sc, bif, 1);
1769
1770                 BRIDGE_UNLOCK(sc);
1771                 return;
1772         }
1773
1774         /* Check if the interface is a span port */
1775         mtx_lock(&bridge_list_mtx);
1776         LIST_FOREACH(sc, &bridge_list, sc_list) {
1777                 BRIDGE_LOCK(sc);
1778                 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1779                         if (ifp == bif->bif_ifp) {
1780                                 bridge_delete_span(sc, bif);
1781                                 break;
1782                         }
1783
1784                 BRIDGE_UNLOCK(sc);
1785         }
1786         mtx_unlock(&bridge_list_mtx);
1787 }
1788
1789 /*
1790  * bridge_init:
1791  *
1792  *      Initialize a bridge interface.
1793  */
1794 static void
1795 bridge_init(void *xsc)
1796 {
1797         struct bridge_softc *sc = (struct bridge_softc *)xsc;
1798         struct ifnet *ifp = sc->sc_ifp;
1799
1800         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1801                 return;
1802
1803         BRIDGE_LOCK(sc);
1804         callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1805             bridge_timer, sc);
1806
1807         ifp->if_drv_flags |= IFF_DRV_RUNNING;
1808         bstp_init(&sc->sc_stp);         /* Initialize Spanning Tree */
1809
1810         BRIDGE_UNLOCK(sc);
1811 }
1812
1813 /*
1814  * bridge_stop:
1815  *
1816  *      Stop the bridge interface.
1817  */
1818 static void
1819 bridge_stop(struct ifnet *ifp, int disable)
1820 {
1821         struct bridge_softc *sc = ifp->if_softc;
1822
1823         BRIDGE_LOCK_ASSERT(sc);
1824
1825         if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1826                 return;
1827
1828         callout_stop(&sc->sc_brcallout);
1829         bstp_stop(&sc->sc_stp);
1830
1831         bridge_rtflush(sc, IFBF_FLUSHDYN);
1832
1833         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1834 }
1835
1836 /*
1837  * bridge_enqueue:
1838  *
1839  *      Enqueue a packet on a bridge member interface.
1840  *
1841  */
1842 static int
1843 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
1844 {
1845         int len, err = 0;
1846         short mflags;
1847         struct mbuf *m0;
1848
1849         /* We may be sending a fragment so traverse the mbuf */
1850         for (; m; m = m0) {
1851                 m0 = m->m_nextpkt;
1852                 m->m_nextpkt = NULL;
1853                 len = m->m_pkthdr.len;
1854                 mflags = m->m_flags;
1855
1856                 /*
1857                  * If underlying interface can not do VLAN tag insertion itself
1858                  * then attach a packet tag that holds it.
1859                  */
1860                 if ((m->m_flags & M_VLANTAG) &&
1861                     (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
1862                         m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
1863                         if (m == NULL) {
1864                                 if_printf(dst_ifp,
1865                                     "unable to prepend VLAN header\n");
1866                                 dst_ifp->if_oerrors++;
1867                                 continue;
1868                         }
1869                         m->m_flags &= ~M_VLANTAG;
1870                 }
1871
1872                 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */
1873                 if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
1874                         m_freem(m0);
1875                         sc->sc_ifp->if_oerrors++;
1876                         break;
1877                 }
1878
1879                 sc->sc_ifp->if_opackets++;
1880                 sc->sc_ifp->if_obytes += len;
1881                 if (mflags & M_MCAST)
1882                         sc->sc_ifp->if_omcasts++;
1883         }
1884
1885         return (err);
1886 }
1887
1888 /*
1889  * bridge_dummynet:
1890  *
1891  *      Receive a queued packet from dummynet and pass it on to the output
1892  *      interface.
1893  *
1894  *      The mbuf has the Ethernet header already attached.
1895  */
1896 static void
1897 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
1898 {
1899         struct bridge_softc *sc;
1900
1901         sc = ifp->if_bridge;
1902
1903         /*
1904          * The packet didnt originate from a member interface. This should only
1905          * ever happen if a member interface is removed while packets are
1906          * queued for it.
1907          */
1908         if (sc == NULL) {
1909                 m_freem(m);
1910                 return;
1911         }
1912
1913         if (PFIL_HOOKED(&V_inet_pfil_hook)
1914 #ifdef INET6
1915             || PFIL_HOOKED(&V_inet6_pfil_hook)
1916 #endif
1917             ) {
1918                 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
1919                         return;
1920                 if (m == NULL)
1921                         return;
1922         }
1923
1924         bridge_enqueue(sc, ifp, m);
1925 }
1926
1927 /*
1928  * bridge_output:
1929  *
1930  *      Send output from a bridge member interface.  This
1931  *      performs the bridging function for locally originated
1932  *      packets.
1933  *
1934  *      The mbuf has the Ethernet header already attached.  We must
1935  *      enqueue or free the mbuf before returning.
1936  */
1937 static int
1938 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
1939     struct rtentry *rt)
1940 {
1941         struct ether_header *eh;
1942         struct ifnet *dst_if;
1943         struct bridge_softc *sc;
1944         uint16_t vlan;
1945
1946         if (m->m_len < ETHER_HDR_LEN) {
1947                 m = m_pullup(m, ETHER_HDR_LEN);
1948                 if (m == NULL)
1949                         return (0);
1950         }
1951
1952         eh = mtod(m, struct ether_header *);
1953         sc = ifp->if_bridge;
1954         vlan = VLANTAGOF(m);
1955
1956         BRIDGE_LOCK(sc);
1957
1958         /*
1959          * If bridge is down, but the original output interface is up,
1960          * go ahead and send out that interface.  Otherwise, the packet
1961          * is dropped below.
1962          */
1963         if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1964                 dst_if = ifp;
1965                 goto sendunicast;
1966         }
1967
1968         /*
1969          * If the packet is a multicast, or we don't know a better way to
1970          * get there, send to all interfaces.
1971          */
1972         if (ETHER_IS_MULTICAST(eh->ether_dhost))
1973                 dst_if = NULL;
1974         else
1975                 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
1976         if (dst_if == NULL) {
1977                 struct bridge_iflist *bif;
1978                 struct mbuf *mc;
1979                 int error = 0, used = 0;
1980
1981                 bridge_span(sc, m);
1982
1983                 BRIDGE_LOCK2REF(sc, error);
1984                 if (error) {
1985                         m_freem(m);
1986                         return (0);
1987                 }
1988
1989                 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1990                         dst_if = bif->bif_ifp;
1991
1992                         if (dst_if->if_type == IFT_GIF)
1993                                 continue;
1994                         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
1995                                 continue;
1996
1997                         /*
1998                          * If this is not the original output interface,
1999                          * and the interface is participating in spanning
2000                          * tree, make sure the port is in a state that
2001                          * allows forwarding.
2002                          */
2003                         if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
2004                             bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2005                                 continue;
2006
2007                         if (LIST_NEXT(bif, bif_next) == NULL) {
2008                                 used = 1;
2009                                 mc = m;
2010                         } else {
2011                                 mc = m_copypacket(m, M_NOWAIT);
2012                                 if (mc == NULL) {
2013                                         sc->sc_ifp->if_oerrors++;
2014                                         continue;
2015                                 }
2016                         }
2017
2018                         bridge_enqueue(sc, dst_if, mc);
2019                 }
2020                 if (used == 0)
2021                         m_freem(m);
2022                 BRIDGE_UNREF(sc);
2023                 return (0);
2024         }
2025
2026 sendunicast:
2027         /*
2028          * XXX Spanning tree consideration here?
2029          */
2030
2031         bridge_span(sc, m);
2032         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2033                 m_freem(m);
2034                 BRIDGE_UNLOCK(sc);
2035                 return (0);
2036         }
2037
2038         BRIDGE_UNLOCK(sc);
2039         bridge_enqueue(sc, dst_if, m);
2040         return (0);
2041 }
2042
2043 /*
2044  * bridge_transmit:
2045  *
2046  *      Do output on a bridge.
2047  *
2048  */
2049 static int
2050 bridge_transmit(struct ifnet *ifp, struct mbuf *m)
2051 {
2052         struct bridge_softc *sc;
2053         struct ether_header *eh;
2054         struct ifnet *dst_if;
2055         int error = 0;
2056
2057         sc = ifp->if_softc;
2058
2059         ETHER_BPF_MTAP(ifp, m);
2060
2061         eh = mtod(m, struct ether_header *);
2062
2063         BRIDGE_LOCK(sc);
2064         if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) &&
2065             (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) {
2066                 BRIDGE_UNLOCK(sc);
2067                 error = bridge_enqueue(sc, dst_if, m);
2068         } else
2069                 bridge_broadcast(sc, ifp, m, 0);
2070
2071         return (error);
2072 }
2073
2074 /*
2075  * The ifp->if_qflush entry point for if_bridge(4) is no-op.
2076  */
2077 static void
2078 bridge_qflush(struct ifnet *ifp __unused)
2079 {
2080 }
2081
2082 /*
2083  * bridge_forward:
2084  *
2085  *      The forwarding function of the bridge.
2086  *
2087  *      NOTE: Releases the lock on return.
2088  */
2089 static void
2090 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
2091     struct mbuf *m)
2092 {
2093         struct bridge_iflist *dbif;
2094         struct ifnet *src_if, *dst_if, *ifp;
2095         struct ether_header *eh;
2096         uint16_t vlan;
2097         uint8_t *dst;
2098         int error;
2099
2100         src_if = m->m_pkthdr.rcvif;
2101         ifp = sc->sc_ifp;
2102
2103         ifp->if_ipackets++;
2104         ifp->if_ibytes += m->m_pkthdr.len;
2105         vlan = VLANTAGOF(m);
2106
2107         if ((sbif->bif_flags & IFBIF_STP) &&
2108             sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2109                 goto drop;
2110
2111         eh = mtod(m, struct ether_header *);
2112         dst = eh->ether_dhost;
2113
2114         /* If the interface is learning, record the address. */
2115         if (sbif->bif_flags & IFBIF_LEARNING) {
2116                 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2117                     sbif, 0, IFBAF_DYNAMIC);
2118                 /*
2119                  * If the interface has addresses limits then deny any source
2120                  * that is not in the cache.
2121                  */
2122                 if (error && sbif->bif_addrmax)
2123                         goto drop;
2124         }
2125
2126         if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2127             sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2128                 goto drop;
2129
2130         /*
2131          * At this point, the port either doesn't participate
2132          * in spanning tree or it is in the forwarding state.
2133          */
2134
2135         /*
2136          * If the packet is unicast, destined for someone on
2137          * "this" side of the bridge, drop it.
2138          */
2139         if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2140                 dst_if = bridge_rtlookup(sc, dst, vlan);
2141                 if (src_if == dst_if)
2142                         goto drop;
2143         } else {
2144                 /*
2145                  * Check if its a reserved multicast address, any address
2146                  * listed in 802.1D section 7.12.6 may not be forwarded by the
2147                  * bridge.
2148                  * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2149                  */
2150                 if (dst[0] == 0x01 && dst[1] == 0x80 &&
2151                     dst[2] == 0xc2 && dst[3] == 0x00 &&
2152                     dst[4] == 0x00 && dst[5] <= 0x0f)
2153                         goto drop;
2154
2155                 /* ...forward it to all interfaces. */
2156                 ifp->if_imcasts++;
2157                 dst_if = NULL;
2158         }
2159
2160         /*
2161          * If we have a destination interface which is a member of our bridge,
2162          * OR this is a unicast packet, push it through the bpf(4) machinery.
2163          * For broadcast or multicast packets, don't bother because it will
2164          * be reinjected into ether_input. We do this before we pass the packets
2165          * through the pfil(9) framework, as it is possible that pfil(9) will
2166          * drop the packet, or possibly modify it, making it difficult to debug
2167          * firewall issues on the bridge.
2168          */
2169         if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2170                 ETHER_BPF_MTAP(ifp, m);
2171
2172         /* run the packet filter */
2173         if (PFIL_HOOKED(&V_inet_pfil_hook)
2174 #ifdef INET6
2175             || PFIL_HOOKED(&V_inet6_pfil_hook)
2176 #endif
2177             ) {
2178                 BRIDGE_UNLOCK(sc);
2179                 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2180                         return;
2181                 if (m == NULL)
2182                         return;
2183                 BRIDGE_LOCK(sc);
2184         }
2185
2186         if (dst_if == NULL) {
2187                 bridge_broadcast(sc, src_if, m, 1);
2188                 return;
2189         }
2190
2191         /*
2192          * At this point, we're dealing with a unicast frame
2193          * going to a different interface.
2194          */
2195         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2196                 goto drop;
2197
2198         dbif = bridge_lookup_member_if(sc, dst_if);
2199         if (dbif == NULL)
2200                 /* Not a member of the bridge (anymore?) */
2201                 goto drop;
2202
2203         /* Private segments can not talk to each other */
2204         if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2205                 goto drop;
2206
2207         if ((dbif->bif_flags & IFBIF_STP) &&
2208             dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2209                 goto drop;
2210
2211         BRIDGE_UNLOCK(sc);
2212
2213         if (PFIL_HOOKED(&V_inet_pfil_hook)
2214 #ifdef INET6
2215             || PFIL_HOOKED(&V_inet6_pfil_hook)
2216 #endif
2217             ) {
2218                 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2219                         return;
2220                 if (m == NULL)
2221                         return;
2222         }
2223
2224         bridge_enqueue(sc, dst_if, m);
2225         return;
2226
2227 drop:
2228         BRIDGE_UNLOCK(sc);
2229         m_freem(m);
2230 }
2231
2232 /*
2233  * bridge_input:
2234  *
2235  *      Receive input from a member interface.  Queue the packet for
2236  *      bridging if it is not for us.
2237  */
2238 static struct mbuf *
2239 bridge_input(struct ifnet *ifp, struct mbuf *m)
2240 {
2241         struct bridge_softc *sc = ifp->if_bridge;
2242         struct bridge_iflist *bif, *bif2;
2243         struct ifnet *bifp;
2244         struct ether_header *eh;
2245         struct mbuf *mc, *mc2;
2246         uint16_t vlan;
2247         int error;
2248
2249         if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2250                 return (m);
2251
2252         bifp = sc->sc_ifp;
2253         vlan = VLANTAGOF(m);
2254
2255         /*
2256          * Implement support for bridge monitoring. If this flag has been
2257          * set on this interface, discard the packet once we push it through
2258          * the bpf(4) machinery, but before we do, increment the byte and
2259          * packet counters associated with this interface.
2260          */
2261         if ((bifp->if_flags & IFF_MONITOR) != 0) {
2262                 m->m_pkthdr.rcvif  = bifp;
2263                 ETHER_BPF_MTAP(bifp, m);
2264                 bifp->if_ipackets++;
2265                 bifp->if_ibytes += m->m_pkthdr.len;
2266                 m_freem(m);
2267                 return (NULL);
2268         }
2269         BRIDGE_LOCK(sc);
2270         bif = bridge_lookup_member_if(sc, ifp);
2271         if (bif == NULL) {
2272                 BRIDGE_UNLOCK(sc);
2273                 return (m);
2274         }
2275
2276         eh = mtod(m, struct ether_header *);
2277
2278         bridge_span(sc, m);
2279
2280         if (m->m_flags & (M_BCAST|M_MCAST)) {
2281                 /* Tap off 802.1D packets; they do not get forwarded. */
2282                 if (memcmp(eh->ether_dhost, bstp_etheraddr,
2283                     ETHER_ADDR_LEN) == 0) {
2284                         bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
2285                         BRIDGE_UNLOCK(sc);
2286                         return (NULL);
2287                 }
2288
2289                 if ((bif->bif_flags & IFBIF_STP) &&
2290                     bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2291                         BRIDGE_UNLOCK(sc);
2292                         return (m);
2293                 }
2294
2295                 /*
2296                  * Make a deep copy of the packet and enqueue the copy
2297                  * for bridge processing; return the original packet for
2298                  * local processing.
2299                  */
2300                 mc = m_dup(m, M_NOWAIT);
2301                 if (mc == NULL) {
2302                         BRIDGE_UNLOCK(sc);
2303                         return (m);
2304                 }
2305
2306                 /* Perform the bridge forwarding function with the copy. */
2307                 bridge_forward(sc, bif, mc);
2308
2309                 /*
2310                  * Reinject the mbuf as arriving on the bridge so we have a
2311                  * chance at claiming multicast packets. We can not loop back
2312                  * here from ether_input as a bridge is never a member of a
2313                  * bridge.
2314                  */
2315                 KASSERT(bifp->if_bridge == NULL,
2316                     ("loop created in bridge_input"));
2317                 mc2 = m_dup(m, M_NOWAIT);
2318                 if (mc2 != NULL) {
2319                         /* Keep the layer3 header aligned */
2320                         int i = min(mc2->m_pkthdr.len, max_protohdr);
2321                         mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2322                 }
2323                 if (mc2 != NULL) {
2324                         mc2->m_pkthdr.rcvif = bifp;
2325                         (*bifp->if_input)(bifp, mc2);
2326                 }
2327
2328                 /* Return the original packet for local processing. */
2329                 return (m);
2330         }
2331
2332         if ((bif->bif_flags & IFBIF_STP) &&
2333             bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2334                 BRIDGE_UNLOCK(sc);
2335                 return (m);
2336         }
2337
2338 #if (defined(INET) || defined(INET6))
2339 #   define OR_CARP_CHECK_WE_ARE_DST(iface) \
2340         || ((iface)->if_carp \
2341             && (*carp_forus_p)((iface), eh->ether_dhost))
2342 #   define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2343         || ((iface)->if_carp \
2344             && (*carp_forus_p)((iface), eh->ether_shost))
2345 #else
2346 #   define OR_CARP_CHECK_WE_ARE_DST(iface)
2347 #   define OR_CARP_CHECK_WE_ARE_SRC(iface)
2348 #endif
2349
2350 #ifdef INET6
2351 #   define OR_PFIL_HOOKED_INET6 \
2352         || PFIL_HOOKED(&V_inet6_pfil_hook)
2353 #else
2354 #   define OR_PFIL_HOOKED_INET6
2355 #endif
2356
2357 #define GRAB_OUR_PACKETS(iface) \
2358         if ((iface)->if_type == IFT_GIF) \
2359                 continue; \
2360         /* It is destined for us. */ \
2361         if (memcmp(IF_LLADDR((iface)), eh->ether_dhost,  ETHER_ADDR_LEN) == 0 \
2362             OR_CARP_CHECK_WE_ARE_DST((iface))                           \
2363             ) {                                                         \
2364                 if ((iface)->if_type == IFT_BRIDGE) {                   \
2365                         ETHER_BPF_MTAP(iface, m);                       \
2366                         iface->if_ipackets++;                           \
2367                         iface->if_ibytes += m->m_pkthdr.len;            \
2368                         /* Filter on the physical interface. */         \
2369                         if (pfil_local_phys &&                          \
2370                             (PFIL_HOOKED(&V_inet_pfil_hook)             \
2371                              OR_PFIL_HOOKED_INET6)) {                   \
2372                                 if (bridge_pfil(&m, NULL, ifp,          \
2373                                     PFIL_IN) != 0 || m == NULL) {       \
2374                                         BRIDGE_UNLOCK(sc);              \
2375                                         return (NULL);                  \
2376                                 }                                       \
2377                                 eh = mtod(m, struct ether_header *);    \
2378                         }                                               \
2379                 }                                                       \
2380                 if (bif->bif_flags & IFBIF_LEARNING) {                  \
2381                         error = bridge_rtupdate(sc, eh->ether_shost,    \
2382                             vlan, bif, 0, IFBAF_DYNAMIC);               \
2383                         if (error && bif->bif_addrmax) {                \
2384                                 BRIDGE_UNLOCK(sc);                      \
2385                                 m_freem(m);                             \
2386                                 return (NULL);                          \
2387                         }                                               \
2388                 }                                                       \
2389                 m->m_pkthdr.rcvif = iface;                              \
2390                 BRIDGE_UNLOCK(sc);                                      \
2391                 return (m);                                             \
2392         }                                                               \
2393                                                                         \
2394         /* We just received a packet that we sent out. */               \
2395         if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2396             OR_CARP_CHECK_WE_ARE_SRC((iface))                   \
2397             ) {                                                         \
2398                 BRIDGE_UNLOCK(sc);                                      \
2399                 m_freem(m);                                             \
2400                 return (NULL);                                          \
2401         }
2402
2403         /*
2404          * Unicast.  Make sure it's not for the bridge.
2405          */
2406         do { GRAB_OUR_PACKETS(bifp) } while (0);
2407
2408         /*
2409          * Give a chance for ifp at first priority. This will help when the
2410          * packet comes through the interface like VLAN's with the same MACs
2411          * on several interfaces from the same bridge. This also will save
2412          * some CPU cycles in case the destination interface and the input
2413          * interface (eq ifp) are the same.
2414          */
2415         do { GRAB_OUR_PACKETS(ifp) } while (0);
2416
2417         /* Now check the all bridge members. */
2418         LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2419                 GRAB_OUR_PACKETS(bif2->bif_ifp)
2420         }
2421
2422 #undef OR_CARP_CHECK_WE_ARE_DST
2423 #undef OR_CARP_CHECK_WE_ARE_SRC
2424 #undef OR_PFIL_HOOKED_INET6
2425 #undef GRAB_OUR_PACKETS
2426
2427         /* Perform the bridge forwarding function. */
2428         bridge_forward(sc, bif, m);
2429
2430         return (NULL);
2431 }
2432
2433 /*
2434  * bridge_broadcast:
2435  *
2436  *      Send a frame to all interfaces that are members of
2437  *      the bridge, except for the one on which the packet
2438  *      arrived.
2439  *
2440  *      NOTE: Releases the lock on return.
2441  */
2442 static void
2443 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2444     struct mbuf *m, int runfilt)
2445 {
2446         struct bridge_iflist *dbif, *sbif;
2447         struct mbuf *mc;
2448         struct ifnet *dst_if;
2449         int error = 0, used = 0, i;
2450
2451         sbif = bridge_lookup_member_if(sc, src_if);
2452
2453         BRIDGE_LOCK2REF(sc, error);
2454         if (error) {
2455                 m_freem(m);
2456                 return;
2457         }
2458
2459         /* Filter on the bridge interface before broadcasting */
2460         if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2461 #ifdef INET6
2462             || PFIL_HOOKED(&V_inet6_pfil_hook)
2463 #endif
2464             )) {
2465                 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2466                         goto out;
2467                 if (m == NULL)
2468                         goto out;
2469         }
2470
2471         LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2472                 dst_if = dbif->bif_ifp;
2473                 if (dst_if == src_if)
2474                         continue;
2475
2476                 /* Private segments can not talk to each other */
2477                 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2478                         continue;
2479
2480                 if ((dbif->bif_flags & IFBIF_STP) &&
2481                     dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2482                         continue;
2483
2484                 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2485                     (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2486                         continue;
2487
2488                 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2489                         continue;
2490
2491                 if (LIST_NEXT(dbif, bif_next) == NULL) {
2492                         mc = m;
2493                         used = 1;
2494                 } else {
2495                         mc = m_dup(m, M_NOWAIT);
2496                         if (mc == NULL) {
2497                                 sc->sc_ifp->if_oerrors++;
2498                                 continue;
2499                         }
2500                 }
2501
2502                 /*
2503                  * Filter on the output interface. Pass a NULL bridge interface
2504                  * pointer so we do not redundantly filter on the bridge for
2505                  * each interface we broadcast on.
2506                  */
2507                 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2508 #ifdef INET6
2509                     || PFIL_HOOKED(&V_inet6_pfil_hook)
2510 #endif
2511                     )) {
2512                         if (used == 0) {
2513                                 /* Keep the layer3 header aligned */
2514                                 i = min(mc->m_pkthdr.len, max_protohdr);
2515                                 mc = m_copyup(mc, i, ETHER_ALIGN);
2516                                 if (mc == NULL) {
2517                                         sc->sc_ifp->if_oerrors++;
2518                                         continue;
2519                                 }
2520                         }
2521                         if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2522                                 continue;
2523                         if (mc == NULL)
2524                                 continue;
2525                 }
2526
2527                 bridge_enqueue(sc, dst_if, mc);
2528         }
2529         if (used == 0)
2530                 m_freem(m);
2531
2532 out:
2533         BRIDGE_UNREF(sc);
2534 }
2535
2536 /*
2537  * bridge_span:
2538  *
2539  *      Duplicate a packet out one or more interfaces that are in span mode,
2540  *      the original mbuf is unmodified.
2541  */
2542 static void
2543 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2544 {
2545         struct bridge_iflist *bif;
2546         struct ifnet *dst_if;
2547         struct mbuf *mc;
2548
2549         if (LIST_EMPTY(&sc->sc_spanlist))
2550                 return;
2551
2552         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2553                 dst_if = bif->bif_ifp;
2554
2555                 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2556                         continue;
2557
2558                 mc = m_copypacket(m, M_NOWAIT);
2559                 if (mc == NULL) {
2560                         sc->sc_ifp->if_oerrors++;
2561                         continue;
2562                 }
2563
2564                 bridge_enqueue(sc, dst_if, mc);
2565         }
2566 }
2567
2568 /*
2569  * bridge_rtupdate:
2570  *
2571  *      Add a bridge routing entry.
2572  */
2573 static int
2574 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2575     struct bridge_iflist *bif, int setflags, uint8_t flags)
2576 {
2577         struct bridge_rtnode *brt;
2578         int error;
2579
2580         BRIDGE_LOCK_ASSERT(sc);
2581
2582         /* Check the source address is valid and not multicast. */
2583         if (ETHER_IS_MULTICAST(dst) ||
2584             (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2585              dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2586                 return (EINVAL);
2587
2588         /* 802.1p frames map to vlan 1 */
2589         if (vlan == 0)
2590                 vlan = 1;
2591
2592         /*
2593          * A route for this destination might already exist.  If so,
2594          * update it, otherwise create a new one.
2595          */
2596         if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2597                 if (sc->sc_brtcnt >= sc->sc_brtmax) {
2598                         sc->sc_brtexceeded++;
2599                         return (ENOSPC);
2600                 }
2601                 /* Check per interface address limits (if enabled) */
2602                 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2603                         bif->bif_addrexceeded++;
2604                         return (ENOSPC);
2605                 }
2606
2607                 /*
2608                  * Allocate a new bridge forwarding node, and
2609                  * initialize the expiration time and Ethernet
2610                  * address.
2611                  */
2612                 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2613                 if (brt == NULL)
2614                         return (ENOMEM);
2615
2616                 if (bif->bif_flags & IFBIF_STICKY)
2617                         brt->brt_flags = IFBAF_STICKY;
2618                 else
2619                         brt->brt_flags = IFBAF_DYNAMIC;
2620
2621                 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2622                 brt->brt_vlan = vlan;
2623
2624                 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2625                         uma_zfree(bridge_rtnode_zone, brt);
2626                         return (error);
2627                 }
2628                 brt->brt_dst = bif;
2629                 bif->bif_addrcnt++;
2630         }
2631
2632         if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2633             brt->brt_dst != bif) {
2634                 brt->brt_dst->bif_addrcnt--;
2635                 brt->brt_dst = bif;
2636                 brt->brt_dst->bif_addrcnt++;
2637         }
2638
2639         if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2640                 brt->brt_expire = time_uptime + sc->sc_brttimeout;
2641         if (setflags)
2642                 brt->brt_flags = flags;
2643
2644         return (0);
2645 }
2646
2647 /*
2648  * bridge_rtlookup:
2649  *
2650  *      Lookup the destination interface for an address.
2651  */
2652 static struct ifnet *
2653 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2654 {
2655         struct bridge_rtnode *brt;
2656
2657         BRIDGE_LOCK_ASSERT(sc);
2658
2659         if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2660                 return (NULL);
2661
2662         return (brt->brt_ifp);
2663 }
2664
2665 /*
2666  * bridge_rttrim:
2667  *
2668  *      Trim the routine table so that we have a number
2669  *      of routing entries less than or equal to the
2670  *      maximum number.
2671  */
2672 static void
2673 bridge_rttrim(struct bridge_softc *sc)
2674 {
2675         struct bridge_rtnode *brt, *nbrt;
2676
2677         BRIDGE_LOCK_ASSERT(sc);
2678
2679         /* Make sure we actually need to do this. */
2680         if (sc->sc_brtcnt <= sc->sc_brtmax)
2681                 return;
2682
2683         /* Force an aging cycle; this might trim enough addresses. */
2684         bridge_rtage(sc);
2685         if (sc->sc_brtcnt <= sc->sc_brtmax)
2686                 return;
2687
2688         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2689                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2690                         bridge_rtnode_destroy(sc, brt);
2691                         if (sc->sc_brtcnt <= sc->sc_brtmax)
2692                                 return;
2693                 }
2694         }
2695 }
2696
2697 /*
2698  * bridge_timer:
2699  *
2700  *      Aging timer for the bridge.
2701  */
2702 static void
2703 bridge_timer(void *arg)
2704 {
2705         struct bridge_softc *sc = arg;
2706
2707         BRIDGE_LOCK_ASSERT(sc);
2708
2709         bridge_rtage(sc);
2710
2711         if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2712                 callout_reset(&sc->sc_brcallout,
2713                     bridge_rtable_prune_period * hz, bridge_timer, sc);
2714 }
2715
2716 /*
2717  * bridge_rtage:
2718  *
2719  *      Perform an aging cycle.
2720  */
2721 static void
2722 bridge_rtage(struct bridge_softc *sc)
2723 {
2724         struct bridge_rtnode *brt, *nbrt;
2725
2726         BRIDGE_LOCK_ASSERT(sc);
2727
2728         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2729                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2730                         if (time_uptime >= brt->brt_expire)
2731                                 bridge_rtnode_destroy(sc, brt);
2732                 }
2733         }
2734 }
2735
2736 /*
2737  * bridge_rtflush:
2738  *
2739  *      Remove all dynamic addresses from the bridge.
2740  */
2741 static void
2742 bridge_rtflush(struct bridge_softc *sc, int full)
2743 {
2744         struct bridge_rtnode *brt, *nbrt;
2745
2746         BRIDGE_LOCK_ASSERT(sc);
2747
2748         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2749                 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2750                         bridge_rtnode_destroy(sc, brt);
2751         }
2752 }
2753
2754 /*
2755  * bridge_rtdaddr:
2756  *
2757  *      Remove an address from the table.
2758  */
2759 static int
2760 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2761 {
2762         struct bridge_rtnode *brt;
2763         int found = 0;
2764
2765         BRIDGE_LOCK_ASSERT(sc);
2766
2767         /*
2768          * If vlan is zero then we want to delete for all vlans so the lookup
2769          * may return more than one.
2770          */
2771         while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
2772                 bridge_rtnode_destroy(sc, brt);
2773                 found = 1;
2774         }
2775
2776         return (found ? 0 : ENOENT);
2777 }
2778
2779 /*
2780  * bridge_rtdelete:
2781  *
2782  *      Delete routes to a speicifc member interface.
2783  */
2784 static void
2785 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2786 {
2787         struct bridge_rtnode *brt, *nbrt;
2788
2789         BRIDGE_LOCK_ASSERT(sc);
2790
2791         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2792                 if (brt->brt_ifp == ifp && (full ||
2793                             (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2794                         bridge_rtnode_destroy(sc, brt);
2795         }
2796 }
2797
2798 /*
2799  * bridge_rtable_init:
2800  *
2801  *      Initialize the route table for this bridge.
2802  */
2803 static void
2804 bridge_rtable_init(struct bridge_softc *sc)
2805 {
2806         int i;
2807
2808         sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
2809             M_DEVBUF, M_WAITOK);
2810
2811         for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
2812                 LIST_INIT(&sc->sc_rthash[i]);
2813
2814         sc->sc_rthash_key = arc4random();
2815         LIST_INIT(&sc->sc_rtlist);
2816 }
2817
2818 /*
2819  * bridge_rtable_fini:
2820  *
2821  *      Deconstruct the route table for this bridge.
2822  */
2823 static void
2824 bridge_rtable_fini(struct bridge_softc *sc)
2825 {
2826
2827         KASSERT(sc->sc_brtcnt == 0,
2828             ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
2829         free(sc->sc_rthash, M_DEVBUF);
2830 }
2831
2832 /*
2833  * The following hash function is adapted from "Hash Functions" by Bob Jenkins
2834  * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
2835  */
2836 #define mix(a, b, c)                                                    \
2837 do {                                                                    \
2838         a -= b; a -= c; a ^= (c >> 13);                                 \
2839         b -= c; b -= a; b ^= (a << 8);                                  \
2840         c -= a; c -= b; c ^= (b >> 13);                                 \
2841         a -= b; a -= c; a ^= (c >> 12);                                 \
2842         b -= c; b -= a; b ^= (a << 16);                                 \
2843         c -= a; c -= b; c ^= (b >> 5);                                  \
2844         a -= b; a -= c; a ^= (c >> 3);                                  \
2845         b -= c; b -= a; b ^= (a << 10);                                 \
2846         c -= a; c -= b; c ^= (b >> 15);                                 \
2847 } while (/*CONSTCOND*/0)
2848
2849 static __inline uint32_t
2850 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
2851 {
2852         uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
2853
2854         b += addr[5] << 8;
2855         b += addr[4];
2856         a += addr[3] << 24;
2857         a += addr[2] << 16;
2858         a += addr[1] << 8;
2859         a += addr[0];
2860
2861         mix(a, b, c);
2862
2863         return (c & BRIDGE_RTHASH_MASK);
2864 }
2865
2866 #undef mix
2867
2868 static int
2869 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
2870 {
2871         int i, d;
2872
2873         for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
2874                 d = ((int)a[i]) - ((int)b[i]);
2875         }
2876
2877         return (d);
2878 }
2879
2880 /*
2881  * bridge_rtnode_lookup:
2882  *
2883  *      Look up a bridge route node for the specified destination. Compare the
2884  *      vlan id or if zero then just return the first match.
2885  */
2886 static struct bridge_rtnode *
2887 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2888 {
2889         struct bridge_rtnode *brt;
2890         uint32_t hash;
2891         int dir;
2892
2893         BRIDGE_LOCK_ASSERT(sc);
2894
2895         hash = bridge_rthash(sc, addr);
2896         LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
2897                 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
2898                 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
2899                         return (brt);
2900                 if (dir > 0)
2901                         return (NULL);
2902         }
2903
2904         return (NULL);
2905 }
2906
2907 /*
2908  * bridge_rtnode_insert:
2909  *
2910  *      Insert the specified bridge node into the route table.  We
2911  *      assume the entry is not already in the table.
2912  */
2913 static int
2914 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
2915 {
2916         struct bridge_rtnode *lbrt;
2917         uint32_t hash;
2918         int dir;
2919
2920         BRIDGE_LOCK_ASSERT(sc);
2921
2922         hash = bridge_rthash(sc, brt->brt_addr);
2923
2924         lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
2925         if (lbrt == NULL) {
2926                 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
2927                 goto out;
2928         }
2929
2930         do {
2931                 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
2932                 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
2933                         return (EEXIST);
2934                 if (dir > 0) {
2935                         LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
2936                         goto out;
2937                 }
2938                 if (LIST_NEXT(lbrt, brt_hash) == NULL) {
2939                         LIST_INSERT_AFTER(lbrt, brt, brt_hash);
2940                         goto out;
2941                 }
2942                 lbrt = LIST_NEXT(lbrt, brt_hash);
2943         } while (lbrt != NULL);
2944
2945 #ifdef DIAGNOSTIC
2946         panic("bridge_rtnode_insert: impossible");
2947 #endif
2948
2949 out:
2950         LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
2951         sc->sc_brtcnt++;
2952
2953         return (0);
2954 }
2955
2956 /*
2957  * bridge_rtnode_destroy:
2958  *
2959  *      Destroy a bridge rtnode.
2960  */
2961 static void
2962 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
2963 {
2964         BRIDGE_LOCK_ASSERT(sc);
2965
2966         LIST_REMOVE(brt, brt_hash);
2967
2968         LIST_REMOVE(brt, brt_list);
2969         sc->sc_brtcnt--;
2970         brt->brt_dst->bif_addrcnt--;
2971         uma_zfree(bridge_rtnode_zone, brt);
2972 }
2973
2974 /*
2975  * bridge_rtable_expire:
2976  *
2977  *      Set the expiry time for all routes on an interface.
2978  */
2979 static void
2980 bridge_rtable_expire(struct ifnet *ifp, int age)
2981 {
2982         struct bridge_softc *sc = ifp->if_bridge;
2983         struct bridge_rtnode *brt;
2984
2985         BRIDGE_LOCK(sc);
2986
2987         /*
2988          * If the age is zero then flush, otherwise set all the expiry times to
2989          * age for the interface
2990          */
2991         if (age == 0)
2992                 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
2993         else {
2994                 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
2995                         /* Cap the expiry time to 'age' */
2996                         if (brt->brt_ifp == ifp &&
2997                             brt->brt_expire > time_uptime + age &&
2998                             (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2999                                 brt->brt_expire = time_uptime + age;
3000                 }
3001         }
3002         BRIDGE_UNLOCK(sc);
3003 }
3004
3005 /*
3006  * bridge_state_change:
3007  *
3008  *      Callback from the bridgestp code when a port changes states.
3009  */
3010 static void
3011 bridge_state_change(struct ifnet *ifp, int state)
3012 {
3013         struct bridge_softc *sc = ifp->if_bridge;
3014         static const char *stpstates[] = {
3015                 "disabled",
3016                 "listening",
3017                 "learning",
3018                 "forwarding",
3019                 "blocking",
3020                 "discarding"
3021         };
3022
3023         if (log_stp)
3024                 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
3025                     sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
3026 }
3027
3028 /*
3029  * Send bridge packets through pfil if they are one of the types pfil can deal
3030  * with, or if they are ARP or REVARP.  (pfil will pass ARP and REVARP without
3031  * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
3032  * that interface.
3033  */
3034 static int
3035 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
3036 {
3037         int snap, error, i, hlen;
3038         struct ether_header *eh1, eh2;
3039         struct ip *ip;
3040         struct llc llc1;
3041         u_int16_t ether_type;
3042
3043         snap = 0;
3044         error = -1;     /* Default error if not error == 0 */
3045
3046 #if 0
3047         /* we may return with the IP fields swapped, ensure its not shared */
3048         KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
3049 #endif
3050
3051         if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0)
3052                 return (0); /* filtering is disabled */
3053
3054         i = min((*mp)->m_pkthdr.len, max_protohdr);
3055         if ((*mp)->m_len < i) {
3056             *mp = m_pullup(*mp, i);
3057             if (*mp == NULL) {
3058                 printf("%s: m_pullup failed\n", __func__);
3059                 return (-1);
3060             }
3061         }
3062
3063         eh1 = mtod(*mp, struct ether_header *);
3064         ether_type = ntohs(eh1->ether_type);
3065
3066         /*
3067          * Check for SNAP/LLC.
3068          */
3069         if (ether_type < ETHERMTU) {
3070                 struct llc *llc2 = (struct llc *)(eh1 + 1);
3071
3072                 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3073                     llc2->llc_dsap == LLC_SNAP_LSAP &&
3074                     llc2->llc_ssap == LLC_SNAP_LSAP &&
3075                     llc2->llc_control == LLC_UI) {
3076                         ether_type = htons(llc2->llc_un.type_snap.ether_type);
3077                         snap = 1;
3078                 }
3079         }
3080
3081         /*
3082          * If we're trying to filter bridge traffic, don't look at anything
3083          * other than IP and ARP traffic.  If the filter doesn't understand
3084          * IPv6, don't allow IPv6 through the bridge either.  This is lame
3085          * since if we really wanted, say, an AppleTalk filter, we are hosed,
3086          * but of course we don't have an AppleTalk filter to begin with.
3087          * (Note that since pfil doesn't understand ARP it will pass *ALL*
3088          * ARP traffic.)
3089          */
3090         switch (ether_type) {
3091                 case ETHERTYPE_ARP:
3092                 case ETHERTYPE_REVARP:
3093                         if (pfil_ipfw_arp == 0)
3094                                 return (0); /* Automatically pass */
3095                         break;
3096
3097                 case ETHERTYPE_IP:
3098 #ifdef INET6
3099                 case ETHERTYPE_IPV6:
3100 #endif /* INET6 */
3101                         break;
3102                 default:
3103                         /*
3104                          * Check to see if the user wants to pass non-ip
3105                          * packets, these will not be checked by pfil(9) and
3106                          * passed unconditionally so the default is to drop.
3107                          */
3108                         if (pfil_onlyip)
3109                                 goto bad;
3110         }
3111
3112         /* Run the packet through pfil before stripping link headers */
3113         if (PFIL_HOOKED(&V_link_pfil_hook) && pfil_ipfw != 0 &&
3114                         dir == PFIL_OUT && ifp != NULL) {
3115
3116                 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL);
3117
3118                 if (*mp == NULL || error != 0) /* packet consumed by filter */
3119                         return (error);
3120         }
3121
3122         /* Strip off the Ethernet header and keep a copy. */
3123         m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3124         m_adj(*mp, ETHER_HDR_LEN);
3125
3126         /* Strip off snap header, if present */
3127         if (snap) {
3128                 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3129                 m_adj(*mp, sizeof(struct llc));
3130         }
3131
3132         /*
3133          * Check the IP header for alignment and errors
3134          */
3135         if (dir == PFIL_IN) {
3136                 switch (ether_type) {
3137                         case ETHERTYPE_IP:
3138                                 error = bridge_ip_checkbasic(mp);
3139                                 break;
3140 #ifdef INET6
3141                         case ETHERTYPE_IPV6:
3142                                 error = bridge_ip6_checkbasic(mp);
3143                                 break;
3144 #endif /* INET6 */
3145                         default:
3146                                 error = 0;
3147                 }
3148                 if (error)
3149                         goto bad;
3150         }
3151
3152         error = 0;
3153
3154         /*
3155          * Run the packet through pfil
3156          */
3157         switch (ether_type) {
3158         case ETHERTYPE_IP:
3159                 /*
3160                  * Run pfil on the member interface and the bridge, both can
3161                  * be skipped by clearing pfil_member or pfil_bridge.
3162                  *
3163                  * Keep the order:
3164                  *   in_if -> bridge_if -> out_if
3165                  */
3166                 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3167                         error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3168                                         dir, NULL);
3169
3170                 if (*mp == NULL || error != 0) /* filter may consume */
3171                         break;
3172
3173                 if (pfil_member && ifp != NULL)
3174                         error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp,
3175                                         dir, NULL);
3176
3177                 if (*mp == NULL || error != 0) /* filter may consume */
3178                         break;
3179
3180                 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
3181                         error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3182                                         dir, NULL);
3183
3184                 if (*mp == NULL || error != 0) /* filter may consume */
3185                         break;
3186
3187                 /* check if we need to fragment the packet */
3188                 /* bridge_fragment generates a mbuf chain of packets */
3189                 /* that already include eth headers */
3190                 if (pfil_member && ifp != NULL && dir == PFIL_OUT) {
3191                         i = (*mp)->m_pkthdr.len;
3192                         if (i > ifp->if_mtu) {
3193                                 error = bridge_fragment(ifp, mp, &eh2, snap,
3194                                             &llc1);
3195                                 return (error);
3196                         }
3197                 }
3198
3199                 /* Recalculate the ip checksum. */
3200                 ip = mtod(*mp, struct ip *);
3201                 hlen = ip->ip_hl << 2;
3202                 if (hlen < sizeof(struct ip))
3203                         goto bad;
3204                 if (hlen > (*mp)->m_len) {
3205                         if ((*mp = m_pullup(*mp, hlen)) == 0)
3206                                 goto bad;
3207                         ip = mtod(*mp, struct ip *);
3208                         if (ip == NULL)
3209                                 goto bad;
3210                 }
3211                 ip->ip_sum = 0;
3212                 if (hlen == sizeof(struct ip))
3213                         ip->ip_sum = in_cksum_hdr(ip);
3214                 else
3215                         ip->ip_sum = in_cksum(*mp, hlen);
3216
3217                 break;
3218 #ifdef INET6
3219         case ETHERTYPE_IPV6:
3220                 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3221                         error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3222                                         dir, NULL);
3223
3224                 if (*mp == NULL || error != 0) /* filter may consume */
3225                         break;
3226
3227                 if (pfil_member && ifp != NULL)
3228                         error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp,
3229                                         dir, NULL);
3230
3231                 if (*mp == NULL || error != 0) /* filter may consume */
3232                         break;
3233
3234                 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
3235                         error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3236                                         dir, NULL);
3237                 break;
3238 #endif
3239         default:
3240                 error = 0;
3241                 break;
3242         }
3243
3244         if (*mp == NULL)
3245                 return (error);
3246         if (error != 0)
3247                 goto bad;
3248
3249         error = -1;
3250
3251         /*
3252          * Finally, put everything back the way it was and return
3253          */
3254         if (snap) {
3255                 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT);
3256                 if (*mp == NULL)
3257                         return (error);
3258                 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3259         }
3260
3261         M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT);
3262         if (*mp == NULL)
3263                 return (error);
3264         bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3265
3266         return (0);
3267
3268 bad:
3269         m_freem(*mp);
3270         *mp = NULL;
3271         return (error);
3272 }
3273
3274 /*
3275  * Perform basic checks on header size since
3276  * pfil assumes ip_input has already processed
3277  * it for it.  Cut-and-pasted from ip_input.c.
3278  * Given how simple the IPv6 version is,
3279  * does the IPv4 version really need to be
3280  * this complicated?
3281  *
3282  * XXX Should we update ipstat here, or not?
3283  * XXX Right now we update ipstat but not
3284  * XXX csum_counter.
3285  */
3286 static int
3287 bridge_ip_checkbasic(struct mbuf **mp)
3288 {
3289         struct mbuf *m = *mp;
3290         struct ip *ip;
3291         int len, hlen;
3292         u_short sum;
3293
3294         if (*mp == NULL)
3295                 return (-1);
3296
3297         if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3298                 if ((m = m_copyup(m, sizeof(struct ip),
3299                         (max_linkhdr + 3) & ~3)) == NULL) {
3300                         /* XXXJRT new stat, please */
3301                         KMOD_IPSTAT_INC(ips_toosmall);
3302                         goto bad;
3303                 }
3304         } else if (__predict_false(m->m_len < sizeof (struct ip))) {
3305                 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3306                         KMOD_IPSTAT_INC(ips_toosmall);
3307                         goto bad;
3308                 }
3309         }
3310         ip = mtod(m, struct ip *);
3311         if (ip == NULL) goto bad;
3312
3313         if (ip->ip_v != IPVERSION) {
3314                 KMOD_IPSTAT_INC(ips_badvers);
3315                 goto bad;
3316         }
3317         hlen = ip->ip_hl << 2;
3318         if (hlen < sizeof(struct ip)) { /* minimum header length */
3319                 KMOD_IPSTAT_INC(ips_badhlen);
3320                 goto bad;
3321         }
3322         if (hlen > m->m_len) {
3323                 if ((m = m_pullup(m, hlen)) == 0) {
3324                         KMOD_IPSTAT_INC(ips_badhlen);
3325                         goto bad;
3326                 }
3327                 ip = mtod(m, struct ip *);
3328                 if (ip == NULL) goto bad;
3329         }
3330
3331         if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3332                 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3333         } else {
3334                 if (hlen == sizeof(struct ip)) {
3335                         sum = in_cksum_hdr(ip);
3336                 } else {
3337                         sum = in_cksum(m, hlen);
3338                 }
3339         }
3340         if (sum) {
3341                 KMOD_IPSTAT_INC(ips_badsum);
3342                 goto bad;
3343         }
3344
3345         /* Retrieve the packet length. */
3346         len = ntohs(ip->ip_len);
3347
3348         /*
3349          * Check for additional length bogosity
3350          */
3351         if (len < hlen) {
3352                 KMOD_IPSTAT_INC(ips_badlen);
3353                 goto bad;
3354         }
3355
3356         /*
3357          * Check that the amount of data in the buffers
3358          * is as at least much as the IP header would have us expect.
3359          * Drop packet if shorter than we expect.
3360          */
3361         if (m->m_pkthdr.len < len) {
3362                 KMOD_IPSTAT_INC(ips_tooshort);
3363                 goto bad;
3364         }
3365
3366         /* Checks out, proceed */
3367         *mp = m;
3368         return (0);
3369
3370 bad:
3371         *mp = m;
3372         return (-1);
3373 }
3374
3375 #ifdef INET6
3376 /*
3377  * Same as above, but for IPv6.
3378  * Cut-and-pasted from ip6_input.c.
3379  * XXX Should we update ip6stat, or not?
3380  */
3381 static int
3382 bridge_ip6_checkbasic(struct mbuf **mp)
3383 {
3384         struct mbuf *m = *mp;
3385         struct ip6_hdr *ip6;
3386
3387         /*
3388          * If the IPv6 header is not aligned, slurp it up into a new
3389          * mbuf with space for link headers, in the event we forward
3390          * it.  Otherwise, if it is aligned, make sure the entire base
3391          * IPv6 header is in the first mbuf of the chain.
3392          */
3393         if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3394                 struct ifnet *inifp = m->m_pkthdr.rcvif;
3395                 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3396                             (max_linkhdr + 3) & ~3)) == NULL) {
3397                         /* XXXJRT new stat, please */
3398                         IP6STAT_INC(ip6s_toosmall);
3399                         in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3400                         goto bad;
3401                 }
3402         } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3403                 struct ifnet *inifp = m->m_pkthdr.rcvif;
3404                 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3405                         IP6STAT_INC(ip6s_toosmall);
3406                         in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3407                         goto bad;
3408                 }
3409         }
3410
3411         ip6 = mtod(m, struct ip6_hdr *);
3412
3413         if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3414                 IP6STAT_INC(ip6s_badvers);
3415                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3416                 goto bad;
3417         }
3418
3419         /* Checks out, proceed */
3420         *mp = m;
3421         return (0);
3422
3423 bad:
3424         *mp = m;
3425         return (-1);
3426 }
3427 #endif /* INET6 */
3428
3429 /*
3430  * bridge_fragment:
3431  *
3432  *      Fragment mbuf chain in multiple packets and prepend ethernet header.
3433  */
3434 static int
3435 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh,
3436     int snap, struct llc *llc)
3437 {
3438         struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL;
3439         struct ip *ip;
3440         int error = -1;
3441
3442         if (m->m_len < sizeof(struct ip) &&
3443             (m = m_pullup(m, sizeof(struct ip))) == NULL)
3444                 goto dropit;
3445         ip = mtod(m, struct ip *);
3446
3447         m->m_pkthdr.csum_flags |= CSUM_IP;
3448         error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist);
3449         if (error)
3450                 goto dropit;
3451
3452         /*
3453          * Walk the chain and re-add the Ethernet header for
3454          * each mbuf packet.
3455          */
3456         for (mcur = m; mcur; mcur = mcur->m_nextpkt) {
3457                 nextpkt = mcur->m_nextpkt;
3458                 mcur->m_nextpkt = NULL;
3459                 if (snap) {
3460                         M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT);
3461                         if (mcur == NULL) {
3462                                 error = ENOBUFS;
3463                                 if (mprev != NULL)
3464                                         mprev->m_nextpkt = nextpkt;
3465                                 goto dropit;
3466                         }
3467                         bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc));
3468                 }
3469
3470                 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT);
3471                 if (mcur == NULL) {
3472                         error = ENOBUFS;
3473                         if (mprev != NULL)
3474                                 mprev->m_nextpkt = nextpkt;
3475                         goto dropit;
3476                 }
3477                 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN);
3478
3479                 /*
3480                  * The previous two M_PREPEND could have inserted one or two
3481                  * mbufs in front so we have to update the previous packet's
3482                  * m_nextpkt.
3483                  */
3484                 mcur->m_nextpkt = nextpkt;
3485                 if (mprev != NULL)
3486                         mprev->m_nextpkt = mcur;
3487                 else {
3488                         /* The first mbuf in the original chain needs to be
3489                          * updated. */
3490                         *mp = mcur;
3491                 }
3492                 mprev = mcur;
3493         }
3494
3495         KMOD_IPSTAT_INC(ips_fragmented);
3496         return (error);
3497
3498 dropit:
3499         for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */
3500                 m = mcur->m_nextpkt;
3501                 m_freem(mcur);
3502         }
3503         return (error);
3504 }
3505
3506 static void
3507 bridge_linkstate(struct ifnet *ifp)
3508 {
3509         struct bridge_softc *sc = ifp->if_bridge;
3510         struct bridge_iflist *bif;
3511
3512         BRIDGE_LOCK(sc);
3513         bif = bridge_lookup_member_if(sc, ifp);
3514         if (bif == NULL) {
3515                 BRIDGE_UNLOCK(sc);
3516                 return;
3517         }
3518         bridge_linkcheck(sc);
3519         BRIDGE_UNLOCK(sc);
3520
3521         bstp_linkstate(&bif->bif_stp);
3522 }
3523
3524 static void
3525 bridge_linkcheck(struct bridge_softc *sc)
3526 {
3527         struct bridge_iflist *bif;
3528         int new_link, hasls;
3529
3530         BRIDGE_LOCK_ASSERT(sc);
3531         new_link = LINK_STATE_DOWN;
3532         hasls = 0;
3533         /* Our link is considered up if at least one of our ports is active */
3534         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
3535                 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
3536                         hasls++;
3537                 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
3538                         new_link = LINK_STATE_UP;
3539                         break;
3540                 }
3541         }
3542         if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) {
3543                 /* If no interfaces support link-state then we default to up */
3544                 new_link = LINK_STATE_UP;
3545         }
3546         if_link_state_change(sc->sc_ifp, new_link);
3547 }