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