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/eventhandler.h>
  85 #include <sys/mbuf.h>
  86 #include <sys/malloc.h>
  87 #include <sys/protosw.h>
  88 #include <sys/systm.h>
  89 #include <sys/jail.h>
  90 #include <sys/time.h>
  91 #include <sys/socket.h> /* for net/if.h */
  92 #include <sys/sockio.h>
  93 #include <sys/ctype.h>  /* string functions */
  94 #include <sys/kernel.h>
  95 #include <sys/random.h>
  96 #include <sys/syslog.h>
  97 #include <sys/sysctl.h>
  98 #include <vm/uma.h>
  99 #include <sys/module.h>
 100 #include <sys/priv.h>
 101 #include <sys/proc.h>
 102 #include <sys/lock.h>
 103 #include <sys/mutex.h>
 104
 105 #include <net/bpf.h>
 106 #include <net/if.h>
 107 #include <net/if_clone.h>
 108 #include <net/if_dl.h>
 109 #include <net/if_types.h>
 110 #include <net/if_var.h>
 111 #include <net/pfil.h>
 112 #include <net/vnet.h>
 113
 114 #include <netinet/in.h>
 115 #include <netinet/in_systm.h>
 116 #include <netinet/in_var.h>
 117 #include <netinet/ip.h>
 118 #include <netinet/ip_var.h>
 119 #ifdef INET6
 120 #include <netinet/ip6.h>
 121 #include <netinet6/ip6_var.h>
 122 #include <netinet6/in6_ifattach.h>
 123 #endif
 124 #if defined(INET) || defined(INET6)
 125 #include <netinet/ip_carp.h>
 126 #endif
 127 #include <machine/in_cksum.h>
 128 #include <netinet/if_ether.h>
 129 #include <net/bridgestp.h>
 130 #include <net/if_bridgevar.h>
 131 #include <net/if_llc.h>
 132 #include <net/if_vlan_var.h>
 133
 134 #include <net/route.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  * Default maximum number of addresses to cache.
 147  */
 148 #ifndef BRIDGE_RTABLE_MAX
 149 #define BRIDGE_RTABLE_MAX               2000
 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 VNET_DEFINE(struct mtx, bridge_list_mtx);
 230 #define V_bridge_list_mtx       VNET(bridge_list_mtx)
 231 eventhandler_tag        bridge_detach_cookie = NULL;
 232
 233 int     bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
 234
 235 uma_zone_t bridge_rtnode_zone;
 236
 237 static int      bridge_clone_create(struct if_clone *, int, caddr_t);
 238 static void     bridge_clone_destroy(struct ifnet *);
 239
 240 static int      bridge_ioctl(struct ifnet *, u_long, caddr_t);
 241 static void     bridge_mutecaps(struct bridge_softc *);
 242 static void     bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
 243                     int);
 244 static void     bridge_ifdetach(void *arg __unused, struct ifnet *);
 245 static void     bridge_init(void *);
 246 static void     bridge_dummynet(struct mbuf *, struct ifnet *);
 247 static void     bridge_stop(struct ifnet *, int);
 248 static int      bridge_transmit(struct ifnet *, struct mbuf *);
 249 static void     bridge_qflush(struct ifnet *);
 250 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
 251 static int      bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
 252                     struct rtentry *);
 253 static int      bridge_enqueue(struct bridge_softc *, struct ifnet *,
 254                     struct mbuf *);
 255 static void     bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
 256
 257 static void     bridge_forward(struct bridge_softc *, struct bridge_iflist *,
 258                     struct mbuf *m);
 259
 260 static void     bridge_timer(void *);
 261
 262 static void     bridge_broadcast(struct bridge_softc *, struct ifnet *,
 263                     struct mbuf *, int);
 264 static void     bridge_span(struct bridge_softc *, struct mbuf *);
 265
 266 static int      bridge_rtupdate(struct bridge_softc *, const uint8_t *,
 267                     uint16_t, struct bridge_iflist *, int, uint8_t);
 268 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
 269                     uint16_t);
 270 static void     bridge_rttrim(struct bridge_softc *);
 271 static void     bridge_rtage(struct bridge_softc *);
 272 static void     bridge_rtflush(struct bridge_softc *, int);
 273 static int      bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
 274                     uint16_t);
 275
 276 static void     bridge_rtable_init(struct bridge_softc *);
 277 static void     bridge_rtable_fini(struct bridge_softc *);
 278
 279 static int      bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
 280 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
 281                     const uint8_t *, uint16_t);
 282 static int      bridge_rtnode_insert(struct bridge_softc *,
 283                     struct bridge_rtnode *);
 284 static void     bridge_rtnode_destroy(struct bridge_softc *,
 285                     struct bridge_rtnode *);
 286 static void     bridge_rtable_expire(struct ifnet *, int);
 287 static void     bridge_state_change(struct ifnet *, int);
 288
 289 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
 290                     const char *name);
 291 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
 292                     struct ifnet *ifp);
 293 static void     bridge_delete_member(struct bridge_softc *,
 294                     struct bridge_iflist *, int);
 295 static void     bridge_delete_span(struct bridge_softc *,
 296                     struct bridge_iflist *);
 297
 298 static int      bridge_ioctl_add(struct bridge_softc *, void *);
 299 static int      bridge_ioctl_del(struct bridge_softc *, void *);
 300 static int      bridge_ioctl_gifflags(struct bridge_softc *, void *);
 301 static int      bridge_ioctl_sifflags(struct bridge_softc *, void *);
 302 static int      bridge_ioctl_scache(struct bridge_softc *, void *);
 303 static int      bridge_ioctl_gcache(struct bridge_softc *, void *);
 304 static int      bridge_ioctl_gifs(struct bridge_softc *, void *);
 305 static int      bridge_ioctl_rts(struct bridge_softc *, void *);
 306 static int      bridge_ioctl_saddr(struct bridge_softc *, void *);
 307 static int      bridge_ioctl_sto(struct bridge_softc *, void *);
 308 static int      bridge_ioctl_gto(struct bridge_softc *, void *);
 309 static int      bridge_ioctl_daddr(struct bridge_softc *, void *);
 310 static int      bridge_ioctl_flush(struct bridge_softc *, void *);
 311 static int      bridge_ioctl_gpri(struct bridge_softc *, void *);
 312 static int      bridge_ioctl_spri(struct bridge_softc *, void *);
 313 static int      bridge_ioctl_ght(struct bridge_softc *, void *);
 314 static int      bridge_ioctl_sht(struct bridge_softc *, void *);
 315 static int      bridge_ioctl_gfd(struct bridge_softc *, void *);
 316 static int      bridge_ioctl_sfd(struct bridge_softc *, void *);
 317 static int      bridge_ioctl_gma(struct bridge_softc *, void *);
 318 static int      bridge_ioctl_sma(struct bridge_softc *, void *);
 319 static int      bridge_ioctl_sifprio(struct bridge_softc *, void *);
 320 static int      bridge_ioctl_sifcost(struct bridge_softc *, void *);
 321 static int      bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
 322 static int      bridge_ioctl_addspan(struct bridge_softc *, void *);
 323 static int      bridge_ioctl_delspan(struct bridge_softc *, void *);
 324 static int      bridge_ioctl_gbparam(struct bridge_softc *, void *);
 325 static int      bridge_ioctl_grte(struct bridge_softc *, void *);
 326 static int      bridge_ioctl_gifsstp(struct bridge_softc *, void *);
 327 static int      bridge_ioctl_sproto(struct bridge_softc *, void *);
 328 static int      bridge_ioctl_stxhc(struct bridge_softc *, void *);
 329 static int      bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
 330                     int);
 331 static int      bridge_ip_checkbasic(struct mbuf **mp);
 332 #ifdef INET6
 333 static int      bridge_ip6_checkbasic(struct mbuf **mp);
 334 #endif /* INET6 */
 335 static int      bridge_fragment(struct ifnet *, struct mbuf *,
 336                     struct ether_header *, int, struct llc *);
 337 static void     bridge_linkstate(struct ifnet *ifp);
 338 static void     bridge_linkcheck(struct bridge_softc *sc);
 339
 340 extern void (*bridge_linkstate_p)(struct ifnet *ifp);
 341
 342 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
 343 #define VLANTAGOF(_m)   \
 344     (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
 345
 346 static struct bstp_cb_ops bridge_ops = {
 347         .bcb_state = bridge_state_change,
 348         .bcb_rtage = bridge_rtable_expire
 349 };
 350
 351 SYSCTL_DECL(_net_link);
 352 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
 353
 354 /* only pass IP[46] packets when pfil is enabled */
 355 static VNET_DEFINE(int, pfil_onlyip) = 1;
 356 #define V_pfil_onlyip   VNET(pfil_onlyip)
 357 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip,
 358     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0,
 359     "Only pass IP packets when pfil is enabled");
 360
 361 /* run pfil hooks on the bridge interface */
 362 static VNET_DEFINE(int, pfil_bridge) = 1;
 363 #define V_pfil_bridge   VNET(pfil_bridge)
 364 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge,
 365     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0,
 366     "Packet filter on the bridge interface");
 367
 368 /* layer2 filter with ipfw */
 369 static VNET_DEFINE(int, pfil_ipfw);
 370 #define V_pfil_ipfw     VNET(pfil_ipfw)
 371
 372 /* layer2 ARP filter with ipfw */
 373 static VNET_DEFINE(int, pfil_ipfw_arp);
 374 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp)
 375 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp,
 376     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0,
 377     "Filter ARP packets through IPFW layer2");
 378
 379 /* run pfil hooks on the member interface */
 380 static VNET_DEFINE(int, pfil_member) = 1;
 381 #define V_pfil_member   VNET(pfil_member)
 382 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member,
 383     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0,
 384     "Packet filter on the member interface");
 385
 386 /* run pfil hooks on the physical interface for locally destined packets */
 387 static VNET_DEFINE(int, pfil_local_phys);
 388 #define V_pfil_local_phys       VNET(pfil_local_phys)
 389 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys,
 390     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0,
 391     "Packet filter on the physical interface for locally destined packets");
 392
 393 /* log STP state changes */
 394 static VNET_DEFINE(int, log_stp);
 395 #define V_log_stp       VNET(log_stp)
 396 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp,
 397     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0,
 398     "Log STP state changes");
 399
 400 /* share MAC with first bridge member */
 401 static VNET_DEFINE(int, bridge_inherit_mac);
 402 #define V_bridge_inherit_mac    VNET(bridge_inherit_mac)
 403 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac,
 404     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0,
 405     "Inherit MAC address from the first bridge member");
 406
 407 static VNET_DEFINE(int, allow_llz_overlap) = 0;
 408 #define V_allow_llz_overlap     VNET(allow_llz_overlap)
 409 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap,
 410     CTLFLAG_VNET | CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0,
 411     "Allow overlap of link-local scope "
 412     "zones of a bridge interface and the member interfaces");
 413
 414 struct bridge_control {
 415         int     (*bc_func)(struct bridge_softc *, void *);
 416         int     bc_argsize;
 417         int     bc_flags;
 418 };
 419
 420 #define BC_F_COPYIN             0x01    /* copy arguments in */
 421 #define BC_F_COPYOUT            0x02    /* copy arguments out */
 422 #define BC_F_SUSER              0x04    /* do super-user check */
 423
 424 const struct bridge_control bridge_control_table[] = {
 425         { bridge_ioctl_add,             sizeof(struct ifbreq),
 426           BC_F_COPYIN|BC_F_SUSER },
 427         { bridge_ioctl_del,             sizeof(struct ifbreq),
 428           BC_F_COPYIN|BC_F_SUSER },
 429
 430         { bridge_ioctl_gifflags,        sizeof(struct ifbreq),
 431           BC_F_COPYIN|BC_F_COPYOUT },
 432         { bridge_ioctl_sifflags,        sizeof(struct ifbreq),
 433           BC_F_COPYIN|BC_F_SUSER },
 434
 435         { bridge_ioctl_scache,          sizeof(struct ifbrparam),
 436           BC_F_COPYIN|BC_F_SUSER },
 437         { bridge_ioctl_gcache,          sizeof(struct ifbrparam),
 438           BC_F_COPYOUT },
 439
 440         { bridge_ioctl_gifs,            sizeof(struct ifbifconf),
 441           BC_F_COPYIN|BC_F_COPYOUT },
 442         { bridge_ioctl_rts,             sizeof(struct ifbaconf),
 443           BC_F_COPYIN|BC_F_COPYOUT },
 444
 445         { bridge_ioctl_saddr,           sizeof(struct ifbareq),
 446           BC_F_COPYIN|BC_F_SUSER },
 447
 448         { bridge_ioctl_sto,             sizeof(struct ifbrparam),
 449           BC_F_COPYIN|BC_F_SUSER },
 450         { bridge_ioctl_gto,             sizeof(struct ifbrparam),
 451           BC_F_COPYOUT },
 452
 453         { bridge_ioctl_daddr,           sizeof(struct ifbareq),
 454           BC_F_COPYIN|BC_F_SUSER },
 455
 456         { bridge_ioctl_flush,           sizeof(struct ifbreq),
 457           BC_F_COPYIN|BC_F_SUSER },
 458
 459         { bridge_ioctl_gpri,            sizeof(struct ifbrparam),
 460           BC_F_COPYOUT },
 461         { bridge_ioctl_spri,            sizeof(struct ifbrparam),
 462           BC_F_COPYIN|BC_F_SUSER },
 463
 464         { bridge_ioctl_ght,             sizeof(struct ifbrparam),
 465           BC_F_COPYOUT },
 466         { bridge_ioctl_sht,             sizeof(struct ifbrparam),
 467           BC_F_COPYIN|BC_F_SUSER },
 468
 469         { bridge_ioctl_gfd,             sizeof(struct ifbrparam),
 470           BC_F_COPYOUT },
 471         { bridge_ioctl_sfd,             sizeof(struct ifbrparam),
 472           BC_F_COPYIN|BC_F_SUSER },
 473
 474         { bridge_ioctl_gma,             sizeof(struct ifbrparam),
 475           BC_F_COPYOUT },
 476         { bridge_ioctl_sma,             sizeof(struct ifbrparam),
 477           BC_F_COPYIN|BC_F_SUSER },
 478
 479         { bridge_ioctl_sifprio,         sizeof(struct ifbreq),
 480           BC_F_COPYIN|BC_F_SUSER },
 481
 482         { bridge_ioctl_sifcost,         sizeof(struct ifbreq),
 483           BC_F_COPYIN|BC_F_SUSER },
 484
 485         { bridge_ioctl_addspan,         sizeof(struct ifbreq),
 486           BC_F_COPYIN|BC_F_SUSER },
 487         { bridge_ioctl_delspan,         sizeof(struct ifbreq),
 488           BC_F_COPYIN|BC_F_SUSER },
 489
 490         { bridge_ioctl_gbparam,         sizeof(struct ifbropreq),
 491           BC_F_COPYOUT },
 492
 493         { bridge_ioctl_grte,            sizeof(struct ifbrparam),
 494           BC_F_COPYOUT },
 495
 496         { bridge_ioctl_gifsstp,         sizeof(struct ifbpstpconf),
 497           BC_F_COPYIN|BC_F_COPYOUT },
 498
 499         { bridge_ioctl_sproto,          sizeof(struct ifbrparam),
 500           BC_F_COPYIN|BC_F_SUSER },
 501
 502         { bridge_ioctl_stxhc,           sizeof(struct ifbrparam),
 503           BC_F_COPYIN|BC_F_SUSER },
 504
 505         { bridge_ioctl_sifmaxaddr,      sizeof(struct ifbreq),
 506           BC_F_COPYIN|BC_F_SUSER },
 507
 508 };
 509 const int bridge_control_table_size = nitems(bridge_control_table);
 510
 511 static VNET_DEFINE(LIST_HEAD(, bridge_softc), bridge_list);
 512 #define V_bridge_list   VNET(bridge_list)
 513 #define BRIDGE_LIST_LOCK_INIT(x)        mtx_init(&V_bridge_list_mtx,    \
 514                                             "if_bridge list", NULL, MTX_DEF)
 515 #define BRIDGE_LIST_LOCK_DESTROY(x)     mtx_destroy(&V_bridge_list_mtx)
 516 #define BRIDGE_LIST_LOCK(x)             mtx_lock(&V_bridge_list_mtx)
 517 #define BRIDGE_LIST_UNLOCK(x)           mtx_unlock(&V_bridge_list_mtx)
 518
 519 static VNET_DEFINE(struct if_clone *, bridge_cloner);
 520 #define V_bridge_cloner VNET(bridge_cloner)
 521
 522 static const char bridge_name[] = "bridge";
 523
 524 static void
 525 vnet_bridge_init(const void *unused __unused)
 526 {
 527
 528         BRIDGE_LIST_LOCK_INIT();
 529         LIST_INIT(&V_bridge_list);
 530         V_bridge_cloner = if_clone_simple(bridge_name,
 531             bridge_clone_create, bridge_clone_destroy, 0);
 532 }
 533 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
 534     vnet_bridge_init, NULL);
 535
 536 static void
 537 vnet_bridge_uninit(const void *unused __unused)
 538 {
 539
 540         if_clone_detach(V_bridge_cloner);
 541         BRIDGE_LIST_LOCK_DESTROY();
 542 }
 543 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
 544     vnet_bridge_uninit, NULL);
 545
 546 static int
 547 bridge_modevent(module_t mod, int type, void *data)
 548 {
 549
 550         switch (type) {
 551         case MOD_LOAD:
 552                 bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
 553                     sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
 554                     UMA_ALIGN_PTR, 0);
 555                 bridge_input_p = bridge_input;
 556                 bridge_output_p = bridge_output;
 557                 bridge_dn_p = bridge_dummynet;
 558                 bridge_linkstate_p = bridge_linkstate;
 559                 bridge_detach_cookie = EVENTHANDLER_REGISTER(
 560                     ifnet_departure_event, bridge_ifdetach, NULL,
 561                     EVENTHANDLER_PRI_ANY);
 562                 break;
 563         case MOD_UNLOAD:
 564                 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
 565                     bridge_detach_cookie);
 566                 uma_zdestroy(bridge_rtnode_zone);
 567                 bridge_input_p = NULL;
 568                 bridge_output_p = NULL;
 569                 bridge_dn_p = NULL;
 570                 bridge_linkstate_p = NULL;
 571                 break;
 572         default:
 573                 return (EOPNOTSUPP);
 574         }
 575         return (0);
 576 }
 577
 578 static moduledata_t bridge_mod = {
 579         "if_bridge",
 580         bridge_modevent,
 581         0
 582 };
 583
 584 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
 585 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
 586
 587 /*
 588  * handler for net.link.bridge.ipfw
 589  */
 590 static int
 591 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
 592 {
 593         int enable = V_pfil_ipfw;
 594         int error;
 595
 596         error = sysctl_handle_int(oidp, &enable, 0, req);
 597         enable &= 1;
 598
 599         if (enable != V_pfil_ipfw) {
 600                 V_pfil_ipfw = enable;
 601
 602                 /*
 603                  * Disable pfil so that ipfw doesnt run twice, if the user
 604                  * really wants both then they can re-enable pfil_bridge and/or
 605                  * pfil_member. Also allow non-ip packets as ipfw can filter by
 606                  * layer2 type.
 607                  */
 608                 if (V_pfil_ipfw) {
 609                         V_pfil_onlyip = 0;
 610                         V_pfil_bridge = 0;
 611                         V_pfil_member = 0;
 612                 }
 613         }
 614
 615         return (error);
 616 }
 617 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw,
 618     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET,
 619     &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I",
 620     "Layer2 filter with IPFW");
 621
 622 /*
 623  * bridge_clone_create:
 624  *
 625  *      Create a new bridge instance.
 626  */
 627 static int
 628 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
 629 {
 630         struct bridge_softc *sc, *sc2;
 631         struct ifnet *bifp, *ifp;
 632         int fb, retry;
 633         unsigned long hostid;
 634
 635         sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
 636         ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
 637         if (ifp == NULL) {
 638                 free(sc, M_DEVBUF);
 639                 return (ENOSPC);
 640         }
 641
 642         BRIDGE_LOCK_INIT(sc);
 643         sc->sc_brtmax = BRIDGE_RTABLE_MAX;
 644         sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
 645
 646         /* Initialize our routing table. */
 647         bridge_rtable_init(sc);
 648
 649         callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
 650
 651         LIST_INIT(&sc->sc_iflist);
 652         LIST_INIT(&sc->sc_spanlist);
 653
 654         ifp->if_softc = sc;
 655         if_initname(ifp, bridge_name, unit);
 656         ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
 657         ifp->if_ioctl = bridge_ioctl;
 658         ifp->if_transmit = bridge_transmit;
 659         ifp->if_qflush = bridge_qflush;
 660         ifp->if_init = bridge_init;
 661         ifp->if_type = IFT_BRIDGE;
 662
 663         /*
 664          * Generate an ethernet address with a locally administered address.
 665          *
 666          * Since we are using random ethernet addresses for the bridge, it is
 667          * possible that we might have address collisions, so make sure that
 668          * this hardware address isn't already in use on another bridge.
 669          * The first try uses the hostid and falls back to arc4rand().
 670          */
 671         fb = 0;
 672         getcredhostid(curthread->td_ucred, &hostid);
 673         do {
 674                 if (fb || hostid == 0) {
 675                         arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1);
 676                         sc->sc_defaddr[0] &= ~1;/* clear multicast bit */
 677                         sc->sc_defaddr[0] |= 2; /* set the LAA bit */
 678                 } else {
 679                         sc->sc_defaddr[0] = 0x2;
 680                         sc->sc_defaddr[1] = (hostid >> 24) & 0xff;
 681                         sc->sc_defaddr[2] = (hostid >> 16) & 0xff;
 682                         sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff;
 683                         sc->sc_defaddr[4] =  hostid        & 0xff;
 684                         sc->sc_defaddr[5] = ifp->if_dunit & 0xff;
 685                 }
 686
 687                 fb = 1;
 688                 retry = 0;
 689                 BRIDGE_LIST_LOCK();
 690                 LIST_FOREACH(sc2, &V_bridge_list, sc_list) {
 691                         bifp = sc2->sc_ifp;
 692                         if (memcmp(sc->sc_defaddr,
 693                             IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) {
 694                                 retry = 1;
 695                                 break;
 696                         }
 697                 }
 698                 BRIDGE_LIST_UNLOCK();
 699         } while (retry == 1);
 700
 701         bstp_attach(&sc->sc_stp, &bridge_ops);
 702         ether_ifattach(ifp, sc->sc_defaddr);
 703         /* Now undo some of the damage... */
 704         ifp->if_baudrate = 0;
 705         ifp->if_type = IFT_BRIDGE;
 706
 707         BRIDGE_LIST_LOCK();
 708         LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list);
 709         BRIDGE_LIST_UNLOCK();
 710
 711         return (0);
 712 }
 713
 714 /*
 715  * bridge_clone_destroy:
 716  *
 717  *      Destroy a bridge instance.
 718  */
 719 static void
 720 bridge_clone_destroy(struct ifnet *ifp)
 721 {
 722         struct bridge_softc *sc = ifp->if_softc;
 723         struct bridge_iflist *bif;
 724
 725         BRIDGE_LOCK(sc);
 726
 727         bridge_stop(ifp, 1);
 728         ifp->if_flags &= ~IFF_UP;
 729
 730         while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
 731                 bridge_delete_member(sc, bif, 0);
 732
 733         while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
 734                 bridge_delete_span(sc, bif);
 735         }
 736
 737         BRIDGE_UNLOCK(sc);
 738
 739         callout_drain(&sc->sc_brcallout);
 740
 741         BRIDGE_LIST_LOCK();
 742         LIST_REMOVE(sc, sc_list);
 743         BRIDGE_LIST_UNLOCK();
 744
 745         bstp_detach(&sc->sc_stp);
 746         ether_ifdetach(ifp);
 747         if_free(ifp);
 748
 749         /* Tear down the routing table. */
 750         bridge_rtable_fini(sc);
 751
 752         BRIDGE_LOCK_DESTROY(sc);
 753         free(sc, M_DEVBUF);
 754 }
 755
 756 /*
 757  * bridge_ioctl:
 758  *
 759  *      Handle a control request from the operator.
 760  */
 761 static int
 762 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
 763 {
 764         struct bridge_softc *sc = ifp->if_softc;
 765         struct ifreq *ifr = (struct ifreq *)data;
 766         struct bridge_iflist *bif;
 767         struct thread *td = curthread;
 768         union {
 769                 struct ifbreq ifbreq;
 770                 struct ifbifconf ifbifconf;
 771                 struct ifbareq ifbareq;
 772                 struct ifbaconf ifbaconf;
 773                 struct ifbrparam ifbrparam;
 774                 struct ifbropreq ifbropreq;
 775         } args;
 776         struct ifdrv *ifd = (struct ifdrv *) data;
 777         const struct bridge_control *bc;
 778         int error = 0;
 779
 780         switch (cmd) {
 781
 782         case SIOCADDMULTI:
 783         case SIOCDELMULTI:
 784                 break;
 785
 786         case SIOCGDRVSPEC:
 787         case SIOCSDRVSPEC:
 788                 if (ifd->ifd_cmd >= bridge_control_table_size) {
 789                         error = EINVAL;
 790                         break;
 791                 }
 792                 bc = &bridge_control_table[ifd->ifd_cmd];
 793
 794                 if (cmd == SIOCGDRVSPEC &&
 795                     (bc->bc_flags & BC_F_COPYOUT) == 0) {
 796                         error = EINVAL;
 797                         break;
 798                 }
 799                 else if (cmd == SIOCSDRVSPEC &&
 800                     (bc->bc_flags & BC_F_COPYOUT) != 0) {
 801                         error = EINVAL;
 802                         break;
 803                 }
 804
 805                 if (bc->bc_flags & BC_F_SUSER) {
 806                         error = priv_check(td, PRIV_NET_BRIDGE);
 807                         if (error)
 808                                 break;
 809                 }
 810
 811                 if (ifd->ifd_len != bc->bc_argsize ||
 812                     ifd->ifd_len > sizeof(args)) {
 813                         error = EINVAL;
 814                         break;
 815                 }
 816
 817                 bzero(&args, sizeof(args));
 818                 if (bc->bc_flags & BC_F_COPYIN) {
 819                         error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
 820                         if (error)
 821                                 break;
 822                 }
 823
 824                 BRIDGE_LOCK(sc);
 825                 error = (*bc->bc_func)(sc, &args);
 826                 BRIDGE_UNLOCK(sc);
 827                 if (error)
 828                         break;
 829
 830                 if (bc->bc_flags & BC_F_COPYOUT)
 831                         error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
 832
 833                 break;
 834
 835         case SIOCSIFFLAGS:
 836                 if (!(ifp->if_flags & IFF_UP) &&
 837                     (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 838                         /*
 839                          * If interface is marked down and it is running,
 840                          * then stop and disable it.
 841                          */
 842                         BRIDGE_LOCK(sc);
 843                         bridge_stop(ifp, 1);
 844                         BRIDGE_UNLOCK(sc);
 845                 } else if ((ifp->if_flags & IFF_UP) &&
 846                     !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 847                         /*
 848                          * If interface is marked up and it is stopped, then
 849                          * start it.
 850                          */
 851                         (*ifp->if_init)(sc);
 852                 }
 853                 break;
 854
 855         case SIOCSIFMTU:
 856                 if (ifr->ifr_mtu < 576) {
 857                         error = EINVAL;
 858                         break;
 859                 }
 860                 if (LIST_EMPTY(&sc->sc_iflist)) {
 861                         sc->sc_ifp->if_mtu = ifr->ifr_mtu;
 862                         break;
 863                 }
 864                 BRIDGE_LOCK(sc);
 865                 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 866                         if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) {
 867                                 log(LOG_NOTICE, "%s: invalid MTU: %u(%s)"
 868                                     " != %d\n", sc->sc_ifp->if_xname,
 869                                     bif->bif_ifp->if_mtu,
 870                                     bif->bif_ifp->if_xname, ifr->ifr_mtu);
 871                                 error = EINVAL;
 872                                 break;
 873                         }
 874                 }
 875                 if (!error)
 876                         sc->sc_ifp->if_mtu = ifr->ifr_mtu;
 877                 BRIDGE_UNLOCK(sc);
 878                 break;
 879         default:
 880                 /*
 881                  * drop the lock as ether_ioctl() will call bridge_start() and
 882                  * cause the lock to be recursed.
 883                  */
 884                 error = ether_ioctl(ifp, cmd, data);
 885                 break;
 886         }
 887
 888         return (error);
 889 }
 890
 891 /*
 892  * bridge_mutecaps:
 893  *
 894  *      Clear or restore unwanted capabilities on the member interface
 895  */
 896 static void
 897 bridge_mutecaps(struct bridge_softc *sc)
 898 {
 899         struct bridge_iflist *bif;
 900         int enabled, mask;
 901
 902         /* Initial bitmask of capabilities to test */
 903         mask = BRIDGE_IFCAPS_MASK;
 904
 905         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 906                 /* Every member must support it or its disabled */
 907                 mask &= bif->bif_savedcaps;
 908         }
 909
 910         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 911                 enabled = bif->bif_ifp->if_capenable;
 912                 enabled &= ~BRIDGE_IFCAPS_STRIP;
 913                 /* strip off mask bits and enable them again if allowed */
 914                 enabled &= ~BRIDGE_IFCAPS_MASK;
 915                 enabled |= mask;
 916                 bridge_set_ifcap(sc, bif, enabled);
 917         }
 918
 919 }
 920
 921 static void
 922 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
 923 {
 924         struct ifnet *ifp = bif->bif_ifp;
 925         struct ifreq ifr;
 926         int error;
 927
 928         bzero(&ifr, sizeof(ifr));
 929         ifr.ifr_reqcap = set;
 930
 931         if (ifp->if_capenable != set) {
 932                 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
 933                 if (error)
 934                         if_printf(sc->sc_ifp,
 935                             "error setting interface capabilities on %s\n",
 936                             ifp->if_xname);
 937         }
 938 }
 939
 940 /*
 941  * bridge_lookup_member:
 942  *
 943  *      Lookup a bridge member interface.
 944  */
 945 static struct bridge_iflist *
 946 bridge_lookup_member(struct bridge_softc *sc, const char *name)
 947 {
 948         struct bridge_iflist *bif;
 949         struct ifnet *ifp;
 950
 951         BRIDGE_LOCK_ASSERT(sc);
 952
 953         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 954                 ifp = bif->bif_ifp;
 955                 if (strcmp(ifp->if_xname, name) == 0)
 956                         return (bif);
 957         }
 958
 959         return (NULL);
 960 }
 961
 962 /*
 963  * bridge_lookup_member_if:
 964  *
 965  *      Lookup a bridge member interface by ifnet*.
 966  */
 967 static struct bridge_iflist *
 968 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
 969 {
 970         struct bridge_iflist *bif;
 971
 972         BRIDGE_LOCK_ASSERT(sc);
 973
 974         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 975                 if (bif->bif_ifp == member_ifp)
 976                         return (bif);
 977         }
 978
 979         return (NULL);
 980 }
 981
 982 /*
 983  * bridge_delete_member:
 984  *
 985  *      Delete the specified member interface.
 986  */
 987 static void
 988 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
 989     int gone)
 990 {
 991         struct ifnet *ifs = bif->bif_ifp;
 992         struct ifnet *fif = NULL;
 993
 994         BRIDGE_LOCK_ASSERT(sc);
 995
 996         if (bif->bif_flags & IFBIF_STP)
 997                 bstp_disable(&bif->bif_stp);
 998
 999         ifs->if_bridge = NULL;
1000         BRIDGE_XLOCK(sc);
1001         LIST_REMOVE(bif, bif_next);
1002         BRIDGE_XDROP(sc);
1003
1004         /*
1005          * If removing the interface that gave the bridge its mac address, set
1006          * the mac address of the bridge to the address of the next member, or
1007          * to its default address if no members are left.
1008          */
1009         if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) {
1010                 if (LIST_EMPTY(&sc->sc_iflist)) {
1011                         bcopy(sc->sc_defaddr,
1012                             IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1013                         sc->sc_ifaddr = NULL;
1014                 } else {
1015                         fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp;
1016                         bcopy(IF_LLADDR(fif),
1017                             IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1018                         sc->sc_ifaddr = fif;
1019                 }
1020                 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1021         }
1022
1023         bridge_linkcheck(sc);
1024         bridge_mutecaps(sc);    /* recalcuate now this interface is removed */
1025         bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
1026         KASSERT(bif->bif_addrcnt == 0,
1027             ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
1028
1029         BRIDGE_UNLOCK(sc);
1030         if (!gone) {
1031                 switch (ifs->if_type) {
1032                 case IFT_ETHER:
1033                 case IFT_L2VLAN:
1034                         /*
1035                          * Take the interface out of promiscuous mode.
1036                          */
1037                         (void) ifpromisc(ifs, 0);
1038                         break;
1039
1040                 case IFT_GIF:
1041                         break;
1042
1043                 default:
1044 #ifdef DIAGNOSTIC
1045                         panic("bridge_delete_member: impossible");
1046 #endif
1047                         break;
1048                 }
1049                 /* reneable any interface capabilities */
1050                 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
1051         }
1052         bstp_destroy(&bif->bif_stp);    /* prepare to free */
1053         BRIDGE_LOCK(sc);
1054         free(bif, M_DEVBUF);
1055 }
1056
1057 /*
1058  * bridge_delete_span:
1059  *
1060  *      Delete the specified span interface.
1061  */
1062 static void
1063 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
1064 {
1065         BRIDGE_LOCK_ASSERT(sc);
1066
1067         KASSERT(bif->bif_ifp->if_bridge == NULL,
1068             ("%s: not a span interface", __func__));
1069
1070         LIST_REMOVE(bif, bif_next);
1071         free(bif, M_DEVBUF);
1072 }
1073
1074 static int
1075 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
1076 {
1077         struct ifbreq *req = arg;
1078         struct bridge_iflist *bif = NULL;
1079         struct ifnet *ifs;
1080         int error = 0;
1081
1082         ifs = ifunit(req->ifbr_ifsname);
1083         if (ifs == NULL)
1084                 return (ENOENT);
1085         if (ifs->if_ioctl == NULL)      /* must be supported */
1086                 return (EINVAL);
1087
1088         /* If it's in the span list, it can't be a member. */
1089         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1090                 if (ifs == bif->bif_ifp)
1091                         return (EBUSY);
1092
1093         if (ifs->if_bridge == sc)
1094                 return (EEXIST);
1095
1096         if (ifs->if_bridge != NULL)
1097                 return (EBUSY);
1098
1099         switch (ifs->if_type) {
1100         case IFT_ETHER:
1101         case IFT_L2VLAN:
1102         case IFT_GIF:
1103                 /* permitted interface types */
1104                 break;
1105         default:
1106                 return (EINVAL);
1107         }
1108
1109 #ifdef INET6
1110         /*
1111          * Two valid inet6 addresses with link-local scope must not be
1112          * on the parent interface and the member interfaces at the
1113          * same time.  This restriction is needed to prevent violation
1114          * of link-local scope zone.  Attempts to add a member
1115          * interface which has inet6 addresses when the parent has
1116          * inet6 triggers removal of all inet6 addresses on the member
1117          * interface.
1118          */
1119
1120         /* Check if the parent interface has a link-local scope addr. */
1121         if (V_allow_llz_overlap == 0 &&
1122             in6ifa_llaonifp(sc->sc_ifp) != NULL) {
1123                 /*
1124                  * If any, remove all inet6 addresses from the member
1125                  * interfaces.
1126                  */
1127                 BRIDGE_XLOCK(sc);
1128                 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1129                         if (in6ifa_llaonifp(bif->bif_ifp)) {
1130                                 BRIDGE_UNLOCK(sc);
1131                                 in6_ifdetach(bif->bif_ifp);
1132                                 BRIDGE_LOCK(sc);
1133                                 if_printf(sc->sc_ifp,
1134                                     "IPv6 addresses on %s have been removed "
1135                                     "before adding it as a member to prevent "
1136                                     "IPv6 address scope violation.\n",
1137                                     bif->bif_ifp->if_xname);
1138                         }
1139                 }
1140                 BRIDGE_XDROP(sc);
1141                 if (in6ifa_llaonifp(ifs)) {
1142                         BRIDGE_UNLOCK(sc);
1143                         in6_ifdetach(ifs);
1144                         BRIDGE_LOCK(sc);
1145                         if_printf(sc->sc_ifp,
1146                             "IPv6 addresses on %s have been removed "
1147                             "before adding it as a member to prevent "
1148                             "IPv6 address scope violation.\n",
1149                             ifs->if_xname);
1150                 }
1151         }
1152 #endif
1153         /* Allow the first Ethernet member to define the MTU */
1154         if (LIST_EMPTY(&sc->sc_iflist))
1155                 sc->sc_ifp->if_mtu = ifs->if_mtu;
1156         else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
1157                 if_printf(sc->sc_ifp, "invalid MTU: %u(%s) != %u\n",
1158                     ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu);
1159                 return (EINVAL);
1160         }
1161
1162         bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1163         if (bif == NULL)
1164                 return (ENOMEM);
1165
1166         bif->bif_ifp = ifs;
1167         bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
1168         bif->bif_savedcaps = ifs->if_capenable;
1169
1170         /*
1171          * Assign the interface's MAC address to the bridge if it's the first
1172          * member and the MAC address of the bridge has not been changed from
1173          * the default randomly generated one.
1174          */
1175         if (V_bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) &&
1176             !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) {
1177                 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
1178                 sc->sc_ifaddr = ifs;
1179                 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
1180         }
1181
1182         ifs->if_bridge = sc;
1183         bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
1184         /*
1185          * XXX: XLOCK HERE!?!
1186          *
1187          * NOTE: insert_***HEAD*** should be safe for the traversals.
1188          */
1189         LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
1190
1191         /* Set interface capabilities to the intersection set of all members */
1192         bridge_mutecaps(sc);
1193         bridge_linkcheck(sc);
1194
1195         /* Place the interface into promiscuous mode */
1196         switch (ifs->if_type) {
1197                 case IFT_ETHER:
1198                 case IFT_L2VLAN:
1199                         BRIDGE_UNLOCK(sc);
1200                         error = ifpromisc(ifs, 1);
1201                         BRIDGE_LOCK(sc);
1202                         break;
1203         }
1204
1205         if (error) {
1206                 bridge_delete_member(sc, bif, 0);
1207                 free(bif, M_DEVBUF);
1208         }
1209         return (error);
1210 }
1211
1212 static int
1213 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
1214 {
1215         struct ifbreq *req = arg;
1216         struct bridge_iflist *bif;
1217
1218         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1219         if (bif == NULL)
1220                 return (ENOENT);
1221
1222         bridge_delete_member(sc, bif, 0);
1223
1224         return (0);
1225 }
1226
1227 static int
1228 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
1229 {
1230         struct ifbreq *req = arg;
1231         struct bridge_iflist *bif;
1232         struct bstp_port *bp;
1233
1234         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1235         if (bif == NULL)
1236                 return (ENOENT);
1237
1238         bp = &bif->bif_stp;
1239         req->ifbr_ifsflags = bif->bif_flags;
1240         req->ifbr_state = bp->bp_state;
1241         req->ifbr_priority = bp->bp_priority;
1242         req->ifbr_path_cost = bp->bp_path_cost;
1243         req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1244         req->ifbr_proto = bp->bp_protover;
1245         req->ifbr_role = bp->bp_role;
1246         req->ifbr_stpflags = bp->bp_flags;
1247         req->ifbr_addrcnt = bif->bif_addrcnt;
1248         req->ifbr_addrmax = bif->bif_addrmax;
1249         req->ifbr_addrexceeded = bif->bif_addrexceeded;
1250
1251         /* Copy STP state options as flags */
1252         if (bp->bp_operedge)
1253                 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
1254         if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
1255                 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
1256         if (bp->bp_ptp_link)
1257                 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
1258         if (bp->bp_flags & BSTP_PORT_AUTOPTP)
1259                 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
1260         if (bp->bp_flags & BSTP_PORT_ADMEDGE)
1261                 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
1262         if (bp->bp_flags & BSTP_PORT_ADMCOST)
1263                 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
1264         return (0);
1265 }
1266
1267 static int
1268 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
1269 {
1270         struct ifbreq *req = arg;
1271         struct bridge_iflist *bif;
1272         struct bstp_port *bp;
1273         int error;
1274
1275         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1276         if (bif == NULL)
1277                 return (ENOENT);
1278         bp = &bif->bif_stp;
1279
1280         if (req->ifbr_ifsflags & IFBIF_SPAN)
1281                 /* SPAN is readonly */
1282                 return (EINVAL);
1283
1284         if (req->ifbr_ifsflags & IFBIF_STP) {
1285                 if ((bif->bif_flags & IFBIF_STP) == 0) {
1286                         error = bstp_enable(&bif->bif_stp);
1287                         if (error)
1288                                 return (error);
1289                 }
1290         } else {
1291                 if ((bif->bif_flags & IFBIF_STP) != 0)
1292                         bstp_disable(&bif->bif_stp);
1293         }
1294
1295         /* Pass on STP flags */
1296         bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
1297         bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
1298         bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
1299         bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
1300
1301         /* Save the bits relating to the bridge */
1302         bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
1303
1304         return (0);
1305 }
1306
1307 static int
1308 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
1309 {
1310         struct ifbrparam *param = arg;
1311
1312         sc->sc_brtmax = param->ifbrp_csize;
1313         bridge_rttrim(sc);
1314
1315         return (0);
1316 }
1317
1318 static int
1319 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
1320 {
1321         struct ifbrparam *param = arg;
1322
1323         param->ifbrp_csize = sc->sc_brtmax;
1324
1325         return (0);
1326 }
1327
1328 static int
1329 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
1330 {
1331         struct ifbifconf *bifc = arg;
1332         struct bridge_iflist *bif;
1333         struct ifbreq breq;
1334         char *buf, *outbuf;
1335         int count, buflen, len, error = 0;
1336
1337         count = 0;
1338         LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
1339                 count++;
1340         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1341                 count++;
1342
1343         buflen = sizeof(breq) * count;
1344         if (bifc->ifbic_len == 0) {
1345                 bifc->ifbic_len = buflen;
1346                 return (0);
1347         }
1348         BRIDGE_UNLOCK(sc);
1349         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1350         BRIDGE_LOCK(sc);
1351
1352         count = 0;
1353         buf = outbuf;
1354         len = min(bifc->ifbic_len, buflen);
1355         bzero(&breq, sizeof(breq));
1356         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1357                 if (len < sizeof(breq))
1358                         break;
1359
1360                 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1361                     sizeof(breq.ifbr_ifsname));
1362                 /* Fill in the ifbreq structure */
1363                 error = bridge_ioctl_gifflags(sc, &breq);
1364                 if (error)
1365                         break;
1366                 memcpy(buf, &breq, sizeof(breq));
1367                 count++;
1368                 buf += sizeof(breq);
1369                 len -= sizeof(breq);
1370         }
1371         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
1372                 if (len < sizeof(breq))
1373                         break;
1374
1375                 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
1376                     sizeof(breq.ifbr_ifsname));
1377                 breq.ifbr_ifsflags = bif->bif_flags;
1378                 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
1379                 memcpy(buf, &breq, sizeof(breq));
1380                 count++;
1381                 buf += sizeof(breq);
1382                 len -= sizeof(breq);
1383         }
1384
1385         BRIDGE_UNLOCK(sc);
1386         bifc->ifbic_len = sizeof(breq) * count;
1387         error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
1388         BRIDGE_LOCK(sc);
1389         free(outbuf, M_TEMP);
1390         return (error);
1391 }
1392
1393 static int
1394 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
1395 {
1396         struct ifbaconf *bac = arg;
1397         struct bridge_rtnode *brt;
1398         struct ifbareq bareq;
1399         char *buf, *outbuf;
1400         int count, buflen, len, error = 0;
1401
1402         if (bac->ifbac_len == 0)
1403                 return (0);
1404
1405         count = 0;
1406         LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
1407                 count++;
1408         buflen = sizeof(bareq) * count;
1409
1410         BRIDGE_UNLOCK(sc);
1411         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1412         BRIDGE_LOCK(sc);
1413
1414         count = 0;
1415         buf = outbuf;
1416         len = min(bac->ifbac_len, buflen);
1417         bzero(&bareq, sizeof(bareq));
1418         LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
1419                 if (len < sizeof(bareq))
1420                         goto out;
1421                 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
1422                     sizeof(bareq.ifba_ifsname));
1423                 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
1424                 bareq.ifba_vlan = brt->brt_vlan;
1425                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
1426                                 time_uptime < brt->brt_expire)
1427                         bareq.ifba_expire = brt->brt_expire - time_uptime;
1428                 else
1429                         bareq.ifba_expire = 0;
1430                 bareq.ifba_flags = brt->brt_flags;
1431
1432                 memcpy(buf, &bareq, sizeof(bareq));
1433                 count++;
1434                 buf += sizeof(bareq);
1435                 len -= sizeof(bareq);
1436         }
1437 out:
1438         BRIDGE_UNLOCK(sc);
1439         bac->ifbac_len = sizeof(bareq) * count;
1440         error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
1441         BRIDGE_LOCK(sc);
1442         free(outbuf, M_TEMP);
1443         return (error);
1444 }
1445
1446 static int
1447 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
1448 {
1449         struct ifbareq *req = arg;
1450         struct bridge_iflist *bif;
1451         int error;
1452
1453         bif = bridge_lookup_member(sc, req->ifba_ifsname);
1454         if (bif == NULL)
1455                 return (ENOENT);
1456
1457         error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
1458             req->ifba_flags);
1459
1460         return (error);
1461 }
1462
1463 static int
1464 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
1465 {
1466         struct ifbrparam *param = arg;
1467
1468         sc->sc_brttimeout = param->ifbrp_ctime;
1469         return (0);
1470 }
1471
1472 static int
1473 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
1474 {
1475         struct ifbrparam *param = arg;
1476
1477         param->ifbrp_ctime = sc->sc_brttimeout;
1478         return (0);
1479 }
1480
1481 static int
1482 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
1483 {
1484         struct ifbareq *req = arg;
1485
1486         return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
1487 }
1488
1489 static int
1490 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
1491 {
1492         struct ifbreq *req = arg;
1493
1494         bridge_rtflush(sc, req->ifbr_ifsflags);
1495         return (0);
1496 }
1497
1498 static int
1499 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
1500 {
1501         struct ifbrparam *param = arg;
1502         struct bstp_state *bs = &sc->sc_stp;
1503
1504         param->ifbrp_prio = bs->bs_bridge_priority;
1505         return (0);
1506 }
1507
1508 static int
1509 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
1510 {
1511         struct ifbrparam *param = arg;
1512
1513         return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
1514 }
1515
1516 static int
1517 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
1518 {
1519         struct ifbrparam *param = arg;
1520         struct bstp_state *bs = &sc->sc_stp;
1521
1522         param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
1523         return (0);
1524 }
1525
1526 static int
1527 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
1528 {
1529         struct ifbrparam *param = arg;
1530
1531         return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
1532 }
1533
1534 static int
1535 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
1536 {
1537         struct ifbrparam *param = arg;
1538         struct bstp_state *bs = &sc->sc_stp;
1539
1540         param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
1541         return (0);
1542 }
1543
1544 static int
1545 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
1546 {
1547         struct ifbrparam *param = arg;
1548
1549         return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
1550 }
1551
1552 static int
1553 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
1554 {
1555         struct ifbrparam *param = arg;
1556         struct bstp_state *bs = &sc->sc_stp;
1557
1558         param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
1559         return (0);
1560 }
1561
1562 static int
1563 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
1564 {
1565         struct ifbrparam *param = arg;
1566
1567         return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
1568 }
1569
1570 static int
1571 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
1572 {
1573         struct ifbreq *req = arg;
1574         struct bridge_iflist *bif;
1575
1576         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1577         if (bif == NULL)
1578                 return (ENOENT);
1579
1580         return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
1581 }
1582
1583 static int
1584 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
1585 {
1586         struct ifbreq *req = arg;
1587         struct bridge_iflist *bif;
1588
1589         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1590         if (bif == NULL)
1591                 return (ENOENT);
1592
1593         return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
1594 }
1595
1596 static int
1597 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
1598 {
1599         struct ifbreq *req = arg;
1600         struct bridge_iflist *bif;
1601
1602         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
1603         if (bif == NULL)
1604                 return (ENOENT);
1605
1606         bif->bif_addrmax = req->ifbr_addrmax;
1607         return (0);
1608 }
1609
1610 static int
1611 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
1612 {
1613         struct ifbreq *req = arg;
1614         struct bridge_iflist *bif = NULL;
1615         struct ifnet *ifs;
1616
1617         ifs = ifunit(req->ifbr_ifsname);
1618         if (ifs == NULL)
1619                 return (ENOENT);
1620
1621         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1622                 if (ifs == bif->bif_ifp)
1623                         return (EBUSY);
1624
1625         if (ifs->if_bridge != NULL)
1626                 return (EBUSY);
1627
1628         switch (ifs->if_type) {
1629                 case IFT_ETHER:
1630                 case IFT_GIF:
1631                 case IFT_L2VLAN:
1632                         break;
1633                 default:
1634                         return (EINVAL);
1635         }
1636
1637         bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
1638         if (bif == NULL)
1639                 return (ENOMEM);
1640
1641         bif->bif_ifp = ifs;
1642         bif->bif_flags = IFBIF_SPAN;
1643
1644         LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
1645
1646         return (0);
1647 }
1648
1649 static int
1650 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
1651 {
1652         struct ifbreq *req = arg;
1653         struct bridge_iflist *bif;
1654         struct ifnet *ifs;
1655
1656         ifs = ifunit(req->ifbr_ifsname);
1657         if (ifs == NULL)
1658                 return (ENOENT);
1659
1660         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1661                 if (ifs == bif->bif_ifp)
1662                         break;
1663
1664         if (bif == NULL)
1665                 return (ENOENT);
1666
1667         bridge_delete_span(sc, bif);
1668
1669         return (0);
1670 }
1671
1672 static int
1673 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
1674 {
1675         struct ifbropreq *req = arg;
1676         struct bstp_state *bs = &sc->sc_stp;
1677         struct bstp_port *root_port;
1678
1679         req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
1680         req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
1681         req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
1682
1683         root_port = bs->bs_root_port;
1684         if (root_port == NULL)
1685                 req->ifbop_root_port = 0;
1686         else
1687                 req->ifbop_root_port = root_port->bp_ifp->if_index;
1688
1689         req->ifbop_holdcount = bs->bs_txholdcount;
1690         req->ifbop_priority = bs->bs_bridge_priority;
1691         req->ifbop_protocol = bs->bs_protover;
1692         req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
1693         req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
1694         req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
1695         req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
1696         req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
1697         req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
1698
1699         return (0);
1700 }
1701
1702 static int
1703 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
1704 {
1705         struct ifbrparam *param = arg;
1706
1707         param->ifbrp_cexceeded = sc->sc_brtexceeded;
1708         return (0);
1709 }
1710
1711 static int
1712 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
1713 {
1714         struct ifbpstpconf *bifstp = arg;
1715         struct bridge_iflist *bif;
1716         struct bstp_port *bp;
1717         struct ifbpstpreq bpreq;
1718         char *buf, *outbuf;
1719         int count, buflen, len, error = 0;
1720
1721         count = 0;
1722         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1723                 if ((bif->bif_flags & IFBIF_STP) != 0)
1724                         count++;
1725         }
1726
1727         buflen = sizeof(bpreq) * count;
1728         if (bifstp->ifbpstp_len == 0) {
1729                 bifstp->ifbpstp_len = buflen;
1730                 return (0);
1731         }
1732
1733         BRIDGE_UNLOCK(sc);
1734         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1735         BRIDGE_LOCK(sc);
1736
1737         count = 0;
1738         buf = outbuf;
1739         len = min(bifstp->ifbpstp_len, buflen);
1740         bzero(&bpreq, sizeof(bpreq));
1741         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
1742                 if (len < sizeof(bpreq))
1743                         break;
1744
1745                 if ((bif->bif_flags & IFBIF_STP) == 0)
1746                         continue;
1747
1748                 bp = &bif->bif_stp;
1749                 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
1750                 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
1751                 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
1752                 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
1753                 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
1754                 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
1755
1756                 memcpy(buf, &bpreq, sizeof(bpreq));
1757                 count++;
1758                 buf += sizeof(bpreq);
1759                 len -= sizeof(bpreq);
1760         }
1761
1762         BRIDGE_UNLOCK(sc);
1763         bifstp->ifbpstp_len = sizeof(bpreq) * count;
1764         error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
1765         BRIDGE_LOCK(sc);
1766         free(outbuf, M_TEMP);
1767         return (error);
1768 }
1769
1770 static int
1771 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
1772 {
1773         struct ifbrparam *param = arg;
1774
1775         return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
1776 }
1777
1778 static int
1779 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
1780 {
1781         struct ifbrparam *param = arg;
1782
1783         return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
1784 }
1785
1786 /*
1787  * bridge_ifdetach:
1788  *
1789  *      Detach an interface from a bridge.  Called when a member
1790  *      interface is detaching.
1791  */
1792 static void
1793 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
1794 {
1795         struct bridge_softc *sc = ifp->if_bridge;
1796         struct bridge_iflist *bif;
1797
1798         if (ifp->if_flags & IFF_RENAMING)
1799                 return;
1800
1801         /* Check if the interface is a bridge member */
1802         if (sc != NULL) {
1803                 BRIDGE_LOCK(sc);
1804
1805                 bif = bridge_lookup_member_if(sc, ifp);
1806                 if (bif != NULL)
1807                         bridge_delete_member(sc, bif, 1);
1808
1809                 BRIDGE_UNLOCK(sc);
1810                 return;
1811         }
1812
1813         /* Check if the interface is a span port */
1814         BRIDGE_LIST_LOCK();
1815         LIST_FOREACH(sc, &V_bridge_list, sc_list) {
1816                 BRIDGE_LOCK(sc);
1817                 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
1818                         if (ifp == bif->bif_ifp) {
1819                                 bridge_delete_span(sc, bif);
1820                                 break;
1821                         }
1822
1823                 BRIDGE_UNLOCK(sc);
1824         }
1825         BRIDGE_LIST_UNLOCK();
1826 }
1827
1828 /*
1829  * bridge_init:
1830  *
1831  *      Initialize a bridge interface.
1832  */
1833 static void
1834 bridge_init(void *xsc)
1835 {
1836         struct bridge_softc *sc = (struct bridge_softc *)xsc;
1837         struct ifnet *ifp = sc->sc_ifp;
1838
1839         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1840                 return;
1841
1842         BRIDGE_LOCK(sc);
1843         callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
1844             bridge_timer, sc);
1845
1846         ifp->if_drv_flags |= IFF_DRV_RUNNING;
1847         bstp_init(&sc->sc_stp);         /* Initialize Spanning Tree */
1848
1849         BRIDGE_UNLOCK(sc);
1850 }
1851
1852 /*
1853  * bridge_stop:
1854  *
1855  *      Stop the bridge interface.
1856  */
1857 static void
1858 bridge_stop(struct ifnet *ifp, int disable)
1859 {
1860         struct bridge_softc *sc = ifp->if_softc;
1861
1862         BRIDGE_LOCK_ASSERT(sc);
1863
1864         if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1865                 return;
1866
1867         callout_stop(&sc->sc_brcallout);
1868         bstp_stop(&sc->sc_stp);
1869
1870         bridge_rtflush(sc, IFBF_FLUSHDYN);
1871
1872         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1873 }
1874
1875 /*
1876  * bridge_enqueue:
1877  *
1878  *      Enqueue a packet on a bridge member interface.
1879  *
1880  */
1881 static int
1882 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
1883 {
1884         int len, err = 0;
1885         short mflags;
1886         struct mbuf *m0;
1887
1888         /* We may be sending a fragment so traverse the mbuf */
1889         for (; m; m = m0) {
1890                 m0 = m->m_nextpkt;
1891                 m->m_nextpkt = NULL;
1892                 len = m->m_pkthdr.len;
1893                 mflags = m->m_flags;
1894
1895                 /*
1896                  * If underlying interface can not do VLAN tag insertion itself
1897                  * then attach a packet tag that holds it.
1898                  */
1899                 if ((m->m_flags & M_VLANTAG) &&
1900                     (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
1901                         m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
1902                         if (m == NULL) {
1903                                 if_printf(dst_ifp,
1904                                     "unable to prepend VLAN header\n");
1905                                 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1);
1906                                 continue;
1907                         }
1908                         m->m_flags &= ~M_VLANTAG;
1909                 }
1910
1911                 if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
1912                         m_freem(m0);
1913                         if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
1914                         break;
1915                 }
1916
1917                 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1);
1918                 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len);
1919                 if (mflags & M_MCAST)
1920                         if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1);
1921         }
1922
1923         return (err);
1924 }
1925
1926 /*
1927  * bridge_dummynet:
1928  *
1929  *      Receive a queued packet from dummynet and pass it on to the output
1930  *      interface.
1931  *
1932  *      The mbuf has the Ethernet header already attached.
1933  */
1934 static void
1935 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
1936 {
1937         struct bridge_softc *sc;
1938
1939         sc = ifp->if_bridge;
1940
1941         /*
1942          * The packet didnt originate from a member interface. This should only
1943          * ever happen if a member interface is removed while packets are
1944          * queued for it.
1945          */
1946         if (sc == NULL) {
1947                 m_freem(m);
1948                 return;
1949         }
1950
1951         if (PFIL_HOOKED(&V_inet_pfil_hook)
1952 #ifdef INET6
1953             || PFIL_HOOKED(&V_inet6_pfil_hook)
1954 #endif
1955             ) {
1956                 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
1957                         return;
1958                 if (m == NULL)
1959                         return;
1960         }
1961
1962         bridge_enqueue(sc, ifp, m);
1963 }
1964
1965 /*
1966  * bridge_output:
1967  *
1968  *      Send output from a bridge member interface.  This
1969  *      performs the bridging function for locally originated
1970  *      packets.
1971  *
1972  *      The mbuf has the Ethernet header already attached.  We must
1973  *      enqueue or free the mbuf before returning.
1974  */
1975 static int
1976 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
1977     struct rtentry *rt)
1978 {
1979         struct ether_header *eh;
1980         struct ifnet *dst_if;
1981         struct bridge_softc *sc;
1982         uint16_t vlan;
1983
1984         if (m->m_len < ETHER_HDR_LEN) {
1985                 m = m_pullup(m, ETHER_HDR_LEN);
1986                 if (m == NULL)
1987                         return (0);
1988         }
1989
1990         eh = mtod(m, struct ether_header *);
1991         sc = ifp->if_bridge;
1992         vlan = VLANTAGOF(m);
1993
1994         BRIDGE_LOCK(sc);
1995
1996         /*
1997          * If bridge is down, but the original output interface is up,
1998          * go ahead and send out that interface.  Otherwise, the packet
1999          * is dropped below.
2000          */
2001         if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2002                 dst_if = ifp;
2003                 goto sendunicast;
2004         }
2005
2006         /*
2007          * If the packet is a multicast, or we don't know a better way to
2008          * get there, send to all interfaces.
2009          */
2010         if (ETHER_IS_MULTICAST(eh->ether_dhost))
2011                 dst_if = NULL;
2012         else
2013                 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
2014         if (dst_if == NULL) {
2015                 struct bridge_iflist *bif;
2016                 struct mbuf *mc;
2017                 int error = 0, used = 0;
2018
2019                 bridge_span(sc, m);
2020
2021                 BRIDGE_LOCK2REF(sc, error);
2022                 if (error) {
2023                         m_freem(m);
2024                         return (0);
2025                 }
2026
2027                 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
2028                         dst_if = bif->bif_ifp;
2029
2030                         if (dst_if->if_type == IFT_GIF)
2031                                 continue;
2032                         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2033                                 continue;
2034
2035                         /*
2036                          * If this is not the original output interface,
2037                          * and the interface is participating in spanning
2038                          * tree, make sure the port is in a state that
2039                          * allows forwarding.
2040                          */
2041                         if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
2042                             bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2043                                 continue;
2044
2045                         if (LIST_NEXT(bif, bif_next) == NULL) {
2046                                 used = 1;
2047                                 mc = m;
2048                         } else {
2049                                 mc = m_copypacket(m, M_NOWAIT);
2050                                 if (mc == NULL) {
2051                                         if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2052                                         continue;
2053                                 }
2054                         }
2055
2056                         bridge_enqueue(sc, dst_if, mc);
2057                 }
2058                 if (used == 0)
2059                         m_freem(m);
2060                 BRIDGE_UNREF(sc);
2061                 return (0);
2062         }
2063
2064 sendunicast:
2065         /*
2066          * XXX Spanning tree consideration here?
2067          */
2068
2069         bridge_span(sc, m);
2070         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2071                 m_freem(m);
2072                 BRIDGE_UNLOCK(sc);
2073                 return (0);
2074         }
2075
2076         BRIDGE_UNLOCK(sc);
2077         bridge_enqueue(sc, dst_if, m);
2078         return (0);
2079 }
2080
2081 /*
2082  * bridge_transmit:
2083  *
2084  *      Do output on a bridge.
2085  *
2086  */
2087 static int
2088 bridge_transmit(struct ifnet *ifp, struct mbuf *m)
2089 {
2090         struct bridge_softc *sc;
2091         struct ether_header *eh;
2092         struct ifnet *dst_if;
2093         int error = 0;
2094
2095         sc = ifp->if_softc;
2096
2097         ETHER_BPF_MTAP(ifp, m);
2098
2099         eh = mtod(m, struct ether_header *);
2100
2101         BRIDGE_LOCK(sc);
2102         if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) &&
2103             (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) {
2104                 BRIDGE_UNLOCK(sc);
2105                 error = bridge_enqueue(sc, dst_if, m);
2106         } else
2107                 bridge_broadcast(sc, ifp, m, 0);
2108
2109         return (error);
2110 }
2111
2112 /*
2113  * The ifp->if_qflush entry point for if_bridge(4) is no-op.
2114  */
2115 static void
2116 bridge_qflush(struct ifnet *ifp __unused)
2117 {
2118 }
2119
2120 /*
2121  * bridge_forward:
2122  *
2123  *      The forwarding function of the bridge.
2124  *
2125  *      NOTE: Releases the lock on return.
2126  */
2127 static void
2128 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
2129     struct mbuf *m)
2130 {
2131         struct bridge_iflist *dbif;
2132         struct ifnet *src_if, *dst_if, *ifp;
2133         struct ether_header *eh;
2134         uint16_t vlan;
2135         uint8_t *dst;
2136         int error;
2137
2138         src_if = m->m_pkthdr.rcvif;
2139         ifp = sc->sc_ifp;
2140
2141         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
2142         if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2143         vlan = VLANTAGOF(m);
2144
2145         if ((sbif->bif_flags & IFBIF_STP) &&
2146             sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2147                 goto drop;
2148
2149         eh = mtod(m, struct ether_header *);
2150         dst = eh->ether_dhost;
2151
2152         /* If the interface is learning, record the address. */
2153         if (sbif->bif_flags & IFBIF_LEARNING) {
2154                 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
2155                     sbif, 0, IFBAF_DYNAMIC);
2156                 /*
2157                  * If the interface has addresses limits then deny any source
2158                  * that is not in the cache.
2159                  */
2160                 if (error && sbif->bif_addrmax)
2161                         goto drop;
2162         }
2163
2164         if ((sbif->bif_flags & IFBIF_STP) != 0 &&
2165             sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
2166                 goto drop;
2167
2168         /*
2169          * At this point, the port either doesn't participate
2170          * in spanning tree or it is in the forwarding state.
2171          */
2172
2173         /*
2174          * If the packet is unicast, destined for someone on
2175          * "this" side of the bridge, drop it.
2176          */
2177         if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
2178                 dst_if = bridge_rtlookup(sc, dst, vlan);
2179                 if (src_if == dst_if)
2180                         goto drop;
2181         } else {
2182                 /*
2183                  * Check if its a reserved multicast address, any address
2184                  * listed in 802.1D section 7.12.6 may not be forwarded by the
2185                  * bridge.
2186                  * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
2187                  */
2188                 if (dst[0] == 0x01 && dst[1] == 0x80 &&
2189                     dst[2] == 0xc2 && dst[3] == 0x00 &&
2190                     dst[4] == 0x00 && dst[5] <= 0x0f)
2191                         goto drop;
2192
2193                 /* ...forward it to all interfaces. */
2194                 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
2195                 dst_if = NULL;
2196         }
2197
2198         /*
2199          * If we have a destination interface which is a member of our bridge,
2200          * OR this is a unicast packet, push it through the bpf(4) machinery.
2201          * For broadcast or multicast packets, don't bother because it will
2202          * be reinjected into ether_input. We do this before we pass the packets
2203          * through the pfil(9) framework, as it is possible that pfil(9) will
2204          * drop the packet, or possibly modify it, making it difficult to debug
2205          * firewall issues on the bridge.
2206          */
2207         if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
2208                 ETHER_BPF_MTAP(ifp, m);
2209
2210         /* run the packet filter */
2211         if (PFIL_HOOKED(&V_inet_pfil_hook)
2212 #ifdef INET6
2213             || PFIL_HOOKED(&V_inet6_pfil_hook)
2214 #endif
2215             ) {
2216                 BRIDGE_UNLOCK(sc);
2217                 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
2218                         return;
2219                 if (m == NULL)
2220                         return;
2221                 BRIDGE_LOCK(sc);
2222         }
2223
2224         if (dst_if == NULL) {
2225                 bridge_broadcast(sc, src_if, m, 1);
2226                 return;
2227         }
2228
2229         /*
2230          * At this point, we're dealing with a unicast frame
2231          * going to a different interface.
2232          */
2233         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2234                 goto drop;
2235
2236         dbif = bridge_lookup_member_if(sc, dst_if);
2237         if (dbif == NULL)
2238                 /* Not a member of the bridge (anymore?) */
2239                 goto drop;
2240
2241         /* Private segments can not talk to each other */
2242         if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
2243                 goto drop;
2244
2245         if ((dbif->bif_flags & IFBIF_STP) &&
2246             dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2247                 goto drop;
2248
2249         BRIDGE_UNLOCK(sc);
2250
2251         if (PFIL_HOOKED(&V_inet_pfil_hook)
2252 #ifdef INET6
2253             || PFIL_HOOKED(&V_inet6_pfil_hook)
2254 #endif
2255             ) {
2256                 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
2257                         return;
2258                 if (m == NULL)
2259                         return;
2260         }
2261
2262         bridge_enqueue(sc, dst_if, m);
2263         return;
2264
2265 drop:
2266         BRIDGE_UNLOCK(sc);
2267         m_freem(m);
2268 }
2269
2270 /*
2271  * bridge_input:
2272  *
2273  *      Receive input from a member interface.  Queue the packet for
2274  *      bridging if it is not for us.
2275  */
2276 static struct mbuf *
2277 bridge_input(struct ifnet *ifp, struct mbuf *m)
2278 {
2279         struct bridge_softc *sc = ifp->if_bridge;
2280         struct bridge_iflist *bif, *bif2;
2281         struct ifnet *bifp;
2282         struct ether_header *eh;
2283         struct mbuf *mc, *mc2;
2284         uint16_t vlan;
2285         int error;
2286
2287         if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
2288                 return (m);
2289
2290         bifp = sc->sc_ifp;
2291         vlan = VLANTAGOF(m);
2292
2293         /*
2294          * Implement support for bridge monitoring. If this flag has been
2295          * set on this interface, discard the packet once we push it through
2296          * the bpf(4) machinery, but before we do, increment the byte and
2297          * packet counters associated with this interface.
2298          */
2299         if ((bifp->if_flags & IFF_MONITOR) != 0) {
2300                 m->m_pkthdr.rcvif  = bifp;
2301                 ETHER_BPF_MTAP(bifp, m);
2302                 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1);
2303                 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
2304                 m_freem(m);
2305                 return (NULL);
2306         }
2307         BRIDGE_LOCK(sc);
2308         bif = bridge_lookup_member_if(sc, ifp);
2309         if (bif == NULL) {
2310                 BRIDGE_UNLOCK(sc);
2311                 return (m);
2312         }
2313
2314         eh = mtod(m, struct ether_header *);
2315
2316         bridge_span(sc, m);
2317
2318         if (m->m_flags & (M_BCAST|M_MCAST)) {
2319                 /* Tap off 802.1D packets; they do not get forwarded. */
2320                 if (memcmp(eh->ether_dhost, bstp_etheraddr,
2321                     ETHER_ADDR_LEN) == 0) {
2322                         bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
2323                         BRIDGE_UNLOCK(sc);
2324                         return (NULL);
2325                 }
2326
2327                 if ((bif->bif_flags & IFBIF_STP) &&
2328                     bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2329                         BRIDGE_UNLOCK(sc);
2330                         return (m);
2331                 }
2332
2333                 /*
2334                  * Make a deep copy of the packet and enqueue the copy
2335                  * for bridge processing; return the original packet for
2336                  * local processing.
2337                  */
2338                 mc = m_dup(m, M_NOWAIT);
2339                 if (mc == NULL) {
2340                         BRIDGE_UNLOCK(sc);
2341                         return (m);
2342                 }
2343
2344                 /* Perform the bridge forwarding function with the copy. */
2345                 bridge_forward(sc, bif, mc);
2346
2347                 /*
2348                  * Reinject the mbuf as arriving on the bridge so we have a
2349                  * chance at claiming multicast packets. We can not loop back
2350                  * here from ether_input as a bridge is never a member of a
2351                  * bridge.
2352                  */
2353                 KASSERT(bifp->if_bridge == NULL,
2354                     ("loop created in bridge_input"));
2355                 mc2 = m_dup(m, M_NOWAIT);
2356                 if (mc2 != NULL) {
2357                         /* Keep the layer3 header aligned */
2358                         int i = min(mc2->m_pkthdr.len, max_protohdr);
2359                         mc2 = m_copyup(mc2, i, ETHER_ALIGN);
2360                 }
2361                 if (mc2 != NULL) {
2362                         mc2->m_pkthdr.rcvif = bifp;
2363                         (*bifp->if_input)(bifp, mc2);
2364                 }
2365
2366                 /* Return the original packet for local processing. */
2367                 return (m);
2368         }
2369
2370         if ((bif->bif_flags & IFBIF_STP) &&
2371             bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
2372                 BRIDGE_UNLOCK(sc);
2373                 return (m);
2374         }
2375
2376 #if (defined(INET) || defined(INET6))
2377 #   define OR_CARP_CHECK_WE_ARE_DST(iface) \
2378         || ((iface)->if_carp \
2379             && (*carp_forus_p)((iface), eh->ether_dhost))
2380 #   define OR_CARP_CHECK_WE_ARE_SRC(iface) \
2381         || ((iface)->if_carp \
2382             && (*carp_forus_p)((iface), eh->ether_shost))
2383 #else
2384 #   define OR_CARP_CHECK_WE_ARE_DST(iface)
2385 #   define OR_CARP_CHECK_WE_ARE_SRC(iface)
2386 #endif
2387
2388 #ifdef INET6
2389 #   define OR_PFIL_HOOKED_INET6 \
2390         || PFIL_HOOKED(&V_inet6_pfil_hook)
2391 #else
2392 #   define OR_PFIL_HOOKED_INET6
2393 #endif
2394
2395 #define GRAB_OUR_PACKETS(iface) \
2396         if ((iface)->if_type == IFT_GIF) \
2397                 continue; \
2398         /* It is destined for us. */ \
2399         if (memcmp(IF_LLADDR((iface)), eh->ether_dhost,  ETHER_ADDR_LEN) == 0 \
2400             OR_CARP_CHECK_WE_ARE_DST((iface))                           \
2401             ) {                                                         \
2402                 if ((iface)->if_type == IFT_BRIDGE) {                   \
2403                         ETHER_BPF_MTAP(iface, m);                       \
2404                         if_inc_counter(iface, IFCOUNTER_IPACKETS, 1);                           \
2405                         if_inc_counter(iface, IFCOUNTER_IBYTES, m->m_pkthdr.len);               \
2406                         /* Filter on the physical interface. */         \
2407                         if (V_pfil_local_phys &&                        \
2408                             (PFIL_HOOKED(&V_inet_pfil_hook)             \
2409                              OR_PFIL_HOOKED_INET6)) {                   \
2410                                 if (bridge_pfil(&m, NULL, ifp,          \
2411                                     PFIL_IN) != 0 || m == NULL) {       \
2412                                         BRIDGE_UNLOCK(sc);              \
2413                                         return (NULL);                  \
2414                                 }                                       \
2415                                 eh = mtod(m, struct ether_header *);    \
2416                         }                                               \
2417                 }                                                       \
2418                 if (bif->bif_flags & IFBIF_LEARNING) {                  \
2419                         error = bridge_rtupdate(sc, eh->ether_shost,    \
2420                             vlan, bif, 0, IFBAF_DYNAMIC);               \
2421                         if (error && bif->bif_addrmax) {                \
2422                                 BRIDGE_UNLOCK(sc);                      \
2423                                 m_freem(m);                             \
2424                                 return (NULL);                          \
2425                         }                                               \
2426                 }                                                       \
2427                 m->m_pkthdr.rcvif = iface;                              \
2428                 BRIDGE_UNLOCK(sc);                                      \
2429                 return (m);                                             \
2430         }                                                               \
2431                                                                         \
2432         /* We just received a packet that we sent out. */               \
2433         if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
2434             OR_CARP_CHECK_WE_ARE_SRC((iface))                   \
2435             ) {                                                         \
2436                 BRIDGE_UNLOCK(sc);                                      \
2437                 m_freem(m);                                             \
2438                 return (NULL);                                          \
2439         }
2440
2441         /*
2442          * Unicast.  Make sure it's not for the bridge.
2443          */
2444         do { GRAB_OUR_PACKETS(bifp) } while (0);
2445
2446         /*
2447          * Give a chance for ifp at first priority. This will help when the
2448          * packet comes through the interface like VLAN's with the same MACs
2449          * on several interfaces from the same bridge. This also will save
2450          * some CPU cycles in case the destination interface and the input
2451          * interface (eq ifp) are the same.
2452          */
2453         do { GRAB_OUR_PACKETS(ifp) } while (0);
2454
2455         /* Now check the all bridge members. */
2456         LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
2457                 GRAB_OUR_PACKETS(bif2->bif_ifp)
2458         }
2459
2460 #undef OR_CARP_CHECK_WE_ARE_DST
2461 #undef OR_CARP_CHECK_WE_ARE_SRC
2462 #undef OR_PFIL_HOOKED_INET6
2463 #undef GRAB_OUR_PACKETS
2464
2465         /* Perform the bridge forwarding function. */
2466         bridge_forward(sc, bif, m);
2467
2468         return (NULL);
2469 }
2470
2471 /*
2472  * bridge_broadcast:
2473  *
2474  *      Send a frame to all interfaces that are members of
2475  *      the bridge, except for the one on which the packet
2476  *      arrived.
2477  *
2478  *      NOTE: Releases the lock on return.
2479  */
2480 static void
2481 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
2482     struct mbuf *m, int runfilt)
2483 {
2484         struct bridge_iflist *dbif, *sbif;
2485         struct mbuf *mc;
2486         struct ifnet *dst_if;
2487         int error = 0, used = 0, i;
2488
2489         sbif = bridge_lookup_member_if(sc, src_if);
2490
2491         BRIDGE_LOCK2REF(sc, error);
2492         if (error) {
2493                 m_freem(m);
2494                 return;
2495         }
2496
2497         /* Filter on the bridge interface before broadcasting */
2498         if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2499 #ifdef INET6
2500             || PFIL_HOOKED(&V_inet6_pfil_hook)
2501 #endif
2502             )) {
2503                 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
2504                         goto out;
2505                 if (m == NULL)
2506                         goto out;
2507         }
2508
2509         LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
2510                 dst_if = dbif->bif_ifp;
2511                 if (dst_if == src_if)
2512                         continue;
2513
2514                 /* Private segments can not talk to each other */
2515                 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
2516                         continue;
2517
2518                 if ((dbif->bif_flags & IFBIF_STP) &&
2519                     dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
2520                         continue;
2521
2522                 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
2523                     (m->m_flags & (M_BCAST|M_MCAST)) == 0)
2524                         continue;
2525
2526                 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2527                         continue;
2528
2529                 if (LIST_NEXT(dbif, bif_next) == NULL) {
2530                         mc = m;
2531                         used = 1;
2532                 } else {
2533                         mc = m_dup(m, M_NOWAIT);
2534                         if (mc == NULL) {
2535                                 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2536                                 continue;
2537                         }
2538                 }
2539
2540                 /*
2541                  * Filter on the output interface. Pass a NULL bridge interface
2542                  * pointer so we do not redundantly filter on the bridge for
2543                  * each interface we broadcast on.
2544                  */
2545                 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
2546 #ifdef INET6
2547                     || PFIL_HOOKED(&V_inet6_pfil_hook)
2548 #endif
2549                     )) {
2550                         if (used == 0) {
2551                                 /* Keep the layer3 header aligned */
2552                                 i = min(mc->m_pkthdr.len, max_protohdr);
2553                                 mc = m_copyup(mc, i, ETHER_ALIGN);
2554                                 if (mc == NULL) {
2555                                         if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2556                                         continue;
2557                                 }
2558                         }
2559                         if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
2560                                 continue;
2561                         if (mc == NULL)
2562                                 continue;
2563                 }
2564
2565                 bridge_enqueue(sc, dst_if, mc);
2566         }
2567         if (used == 0)
2568                 m_freem(m);
2569
2570 out:
2571         BRIDGE_UNREF(sc);
2572 }
2573
2574 /*
2575  * bridge_span:
2576  *
2577  *      Duplicate a packet out one or more interfaces that are in span mode,
2578  *      the original mbuf is unmodified.
2579  */
2580 static void
2581 bridge_span(struct bridge_softc *sc, struct mbuf *m)
2582 {
2583         struct bridge_iflist *bif;
2584         struct ifnet *dst_if;
2585         struct mbuf *mc;
2586
2587         if (LIST_EMPTY(&sc->sc_spanlist))
2588                 return;
2589
2590         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
2591                 dst_if = bif->bif_ifp;
2592
2593                 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
2594                         continue;
2595
2596                 mc = m_copypacket(m, M_NOWAIT);
2597                 if (mc == NULL) {
2598                         if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2599                         continue;
2600                 }
2601
2602                 bridge_enqueue(sc, dst_if, mc);
2603         }
2604 }
2605
2606 /*
2607  * bridge_rtupdate:
2608  *
2609  *      Add a bridge routing entry.
2610  */
2611 static int
2612 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
2613     struct bridge_iflist *bif, int setflags, uint8_t flags)
2614 {
2615         struct bridge_rtnode *brt;
2616         int error;
2617
2618         BRIDGE_LOCK_ASSERT(sc);
2619
2620         /* Check the source address is valid and not multicast. */
2621         if (ETHER_IS_MULTICAST(dst) ||
2622             (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
2623              dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
2624                 return (EINVAL);
2625
2626         /* 802.1p frames map to vlan 1 */
2627         if (vlan == 0)
2628                 vlan = 1;
2629
2630         /*
2631          * A route for this destination might already exist.  If so,
2632          * update it, otherwise create a new one.
2633          */
2634         if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
2635                 if (sc->sc_brtcnt >= sc->sc_brtmax) {
2636                         sc->sc_brtexceeded++;
2637                         return (ENOSPC);
2638                 }
2639                 /* Check per interface address limits (if enabled) */
2640                 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
2641                         bif->bif_addrexceeded++;
2642                         return (ENOSPC);
2643                 }
2644
2645                 /*
2646                  * Allocate a new bridge forwarding node, and
2647                  * initialize the expiration time and Ethernet
2648                  * address.
2649                  */
2650                 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO);
2651                 if (brt == NULL)
2652                         return (ENOMEM);
2653
2654                 if (bif->bif_flags & IFBIF_STICKY)
2655                         brt->brt_flags = IFBAF_STICKY;
2656                 else
2657                         brt->brt_flags = IFBAF_DYNAMIC;
2658
2659                 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
2660                 brt->brt_vlan = vlan;
2661
2662                 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
2663                         uma_zfree(bridge_rtnode_zone, brt);
2664                         return (error);
2665                 }
2666                 brt->brt_dst = bif;
2667                 bif->bif_addrcnt++;
2668         }
2669
2670         if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
2671             brt->brt_dst != bif) {
2672                 brt->brt_dst->bif_addrcnt--;
2673                 brt->brt_dst = bif;
2674                 brt->brt_dst->bif_addrcnt++;
2675         }
2676
2677         if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2678                 brt->brt_expire = time_uptime + sc->sc_brttimeout;
2679         if (setflags)
2680                 brt->brt_flags = flags;
2681
2682         return (0);
2683 }
2684
2685 /*
2686  * bridge_rtlookup:
2687  *
2688  *      Lookup the destination interface for an address.
2689  */
2690 static struct ifnet *
2691 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2692 {
2693         struct bridge_rtnode *brt;
2694
2695         BRIDGE_LOCK_ASSERT(sc);
2696
2697         if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
2698                 return (NULL);
2699
2700         return (brt->brt_ifp);
2701 }
2702
2703 /*
2704  * bridge_rttrim:
2705  *
2706  *      Trim the routine table so that we have a number
2707  *      of routing entries less than or equal to the
2708  *      maximum number.
2709  */
2710 static void
2711 bridge_rttrim(struct bridge_softc *sc)
2712 {
2713         struct bridge_rtnode *brt, *nbrt;
2714
2715         BRIDGE_LOCK_ASSERT(sc);
2716
2717         /* Make sure we actually need to do this. */
2718         if (sc->sc_brtcnt <= sc->sc_brtmax)
2719                 return;
2720
2721         /* Force an aging cycle; this might trim enough addresses. */
2722         bridge_rtage(sc);
2723         if (sc->sc_brtcnt <= sc->sc_brtmax)
2724                 return;
2725
2726         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2727                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2728                         bridge_rtnode_destroy(sc, brt);
2729                         if (sc->sc_brtcnt <= sc->sc_brtmax)
2730                                 return;
2731                 }
2732         }
2733 }
2734
2735 /*
2736  * bridge_timer:
2737  *
2738  *      Aging timer for the bridge.
2739  */
2740 static void
2741 bridge_timer(void *arg)
2742 {
2743         struct bridge_softc *sc = arg;
2744
2745         BRIDGE_LOCK_ASSERT(sc);
2746
2747         bridge_rtage(sc);
2748
2749         if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
2750                 callout_reset(&sc->sc_brcallout,
2751                     bridge_rtable_prune_period * hz, bridge_timer, sc);
2752 }
2753
2754 /*
2755  * bridge_rtage:
2756  *
2757  *      Perform an aging cycle.
2758  */
2759 static void
2760 bridge_rtage(struct bridge_softc *sc)
2761 {
2762         struct bridge_rtnode *brt, *nbrt;
2763
2764         BRIDGE_LOCK_ASSERT(sc);
2765
2766         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2767                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
2768                         if (time_uptime >= brt->brt_expire)
2769                                 bridge_rtnode_destroy(sc, brt);
2770                 }
2771         }
2772 }
2773
2774 /*
2775  * bridge_rtflush:
2776  *
2777  *      Remove all dynamic addresses from the bridge.
2778  */
2779 static void
2780 bridge_rtflush(struct bridge_softc *sc, int full)
2781 {
2782         struct bridge_rtnode *brt, *nbrt;
2783
2784         BRIDGE_LOCK_ASSERT(sc);
2785
2786         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2787                 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
2788                         bridge_rtnode_destroy(sc, brt);
2789         }
2790 }
2791
2792 /*
2793  * bridge_rtdaddr:
2794  *
2795  *      Remove an address from the table.
2796  */
2797 static int
2798 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2799 {
2800         struct bridge_rtnode *brt;
2801         int found = 0;
2802
2803         BRIDGE_LOCK_ASSERT(sc);
2804
2805         /*
2806          * If vlan is zero then we want to delete for all vlans so the lookup
2807          * may return more than one.
2808          */
2809         while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
2810                 bridge_rtnode_destroy(sc, brt);
2811                 found = 1;
2812         }
2813
2814         return (found ? 0 : ENOENT);
2815 }
2816
2817 /*
2818  * bridge_rtdelete:
2819  *
2820  *      Delete routes to a speicifc member interface.
2821  */
2822 static void
2823 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
2824 {
2825         struct bridge_rtnode *brt, *nbrt;
2826
2827         BRIDGE_LOCK_ASSERT(sc);
2828
2829         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
2830                 if (brt->brt_ifp == ifp && (full ||
2831                             (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
2832                         bridge_rtnode_destroy(sc, brt);
2833         }
2834 }
2835
2836 /*
2837  * bridge_rtable_init:
2838  *
2839  *      Initialize the route table for this bridge.
2840  */
2841 static void
2842 bridge_rtable_init(struct bridge_softc *sc)
2843 {
2844         int i;
2845
2846         sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
2847             M_DEVBUF, M_WAITOK);
2848
2849         for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
2850                 LIST_INIT(&sc->sc_rthash[i]);
2851
2852         sc->sc_rthash_key = arc4random();
2853         LIST_INIT(&sc->sc_rtlist);
2854 }
2855
2856 /*
2857  * bridge_rtable_fini:
2858  *
2859  *      Deconstruct the route table for this bridge.
2860  */
2861 static void
2862 bridge_rtable_fini(struct bridge_softc *sc)
2863 {
2864
2865         KASSERT(sc->sc_brtcnt == 0,
2866             ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
2867         free(sc->sc_rthash, M_DEVBUF);
2868 }
2869
2870 /*
2871  * The following hash function is adapted from "Hash Functions" by Bob Jenkins
2872  * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
2873  */
2874 #define mix(a, b, c)                                                    \
2875 do {                                                                    \
2876         a -= b; a -= c; a ^= (c >> 13);                                 \
2877         b -= c; b -= a; b ^= (a << 8);                                  \
2878         c -= a; c -= b; c ^= (b >> 13);                                 \
2879         a -= b; a -= c; a ^= (c >> 12);                                 \
2880         b -= c; b -= a; b ^= (a << 16);                                 \
2881         c -= a; c -= b; c ^= (b >> 5);                                  \
2882         a -= b; a -= c; a ^= (c >> 3);                                  \
2883         b -= c; b -= a; b ^= (a << 10);                                 \
2884         c -= a; c -= b; c ^= (b >> 15);                                 \
2885 } while (/*CONSTCOND*/0)
2886
2887 static __inline uint32_t
2888 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
2889 {
2890         uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
2891
2892         b += addr[5] << 8;
2893         b += addr[4];
2894         a += addr[3] << 24;
2895         a += addr[2] << 16;
2896         a += addr[1] << 8;
2897         a += addr[0];
2898
2899         mix(a, b, c);
2900
2901         return (c & BRIDGE_RTHASH_MASK);
2902 }
2903
2904 #undef mix
2905
2906 static int
2907 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
2908 {
2909         int i, d;
2910
2911         for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
2912                 d = ((int)a[i]) - ((int)b[i]);
2913         }
2914
2915         return (d);
2916 }
2917
2918 /*
2919  * bridge_rtnode_lookup:
2920  *
2921  *      Look up a bridge route node for the specified destination. Compare the
2922  *      vlan id or if zero then just return the first match.
2923  */
2924 static struct bridge_rtnode *
2925 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
2926 {
2927         struct bridge_rtnode *brt;
2928         uint32_t hash;
2929         int dir;
2930
2931         BRIDGE_LOCK_ASSERT(sc);
2932
2933         hash = bridge_rthash(sc, addr);
2934         LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
2935                 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
2936                 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
2937                         return (brt);
2938                 if (dir > 0)
2939                         return (NULL);
2940         }
2941
2942         return (NULL);
2943 }
2944
2945 /*
2946  * bridge_rtnode_insert:
2947  *
2948  *      Insert the specified bridge node into the route table.  We
2949  *      assume the entry is not already in the table.
2950  */
2951 static int
2952 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
2953 {
2954         struct bridge_rtnode *lbrt;
2955         uint32_t hash;
2956         int dir;
2957
2958         BRIDGE_LOCK_ASSERT(sc);
2959
2960         hash = bridge_rthash(sc, brt->brt_addr);
2961
2962         lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
2963         if (lbrt == NULL) {
2964                 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
2965                 goto out;
2966         }
2967
2968         do {
2969                 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
2970                 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
2971                         return (EEXIST);
2972                 if (dir > 0) {
2973                         LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
2974                         goto out;
2975                 }
2976                 if (LIST_NEXT(lbrt, brt_hash) == NULL) {
2977                         LIST_INSERT_AFTER(lbrt, brt, brt_hash);
2978                         goto out;
2979                 }
2980                 lbrt = LIST_NEXT(lbrt, brt_hash);
2981         } while (lbrt != NULL);
2982
2983 #ifdef DIAGNOSTIC
2984         panic("bridge_rtnode_insert: impossible");
2985 #endif
2986
2987 out:
2988         LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
2989         sc->sc_brtcnt++;
2990
2991         return (0);
2992 }
2993
2994 /*
2995  * bridge_rtnode_destroy:
2996  *
2997  *      Destroy a bridge rtnode.
2998  */
2999 static void
3000 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
3001 {
3002         BRIDGE_LOCK_ASSERT(sc);
3003
3004         LIST_REMOVE(brt, brt_hash);
3005
3006         LIST_REMOVE(brt, brt_list);
3007         sc->sc_brtcnt--;
3008         brt->brt_dst->bif_addrcnt--;
3009         uma_zfree(bridge_rtnode_zone, brt);
3010 }
3011
3012 /*
3013  * bridge_rtable_expire:
3014  *
3015  *      Set the expiry time for all routes on an interface.
3016  */
3017 static void
3018 bridge_rtable_expire(struct ifnet *ifp, int age)
3019 {
3020         struct bridge_softc *sc = ifp->if_bridge;
3021         struct bridge_rtnode *brt;
3022
3023         BRIDGE_LOCK(sc);
3024
3025         /*
3026          * If the age is zero then flush, otherwise set all the expiry times to
3027          * age for the interface
3028          */
3029         if (age == 0)
3030                 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
3031         else {
3032                 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
3033                         /* Cap the expiry time to 'age' */
3034                         if (brt->brt_ifp == ifp &&
3035                             brt->brt_expire > time_uptime + age &&
3036                             (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
3037                                 brt->brt_expire = time_uptime + age;
3038                 }
3039         }
3040         BRIDGE_UNLOCK(sc);
3041 }
3042
3043 /*
3044  * bridge_state_change:
3045  *
3046  *      Callback from the bridgestp code when a port changes states.
3047  */
3048 static void
3049 bridge_state_change(struct ifnet *ifp, int state)
3050 {
3051         struct bridge_softc *sc = ifp->if_bridge;
3052         static const char *stpstates[] = {
3053                 "disabled",
3054                 "listening",
3055                 "learning",
3056                 "forwarding",
3057                 "blocking",
3058                 "discarding"
3059         };
3060
3061         if (V_log_stp)
3062                 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
3063                     sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
3064 }
3065
3066 /*
3067  * Send bridge packets through pfil if they are one of the types pfil can deal
3068  * with, or if they are ARP or REVARP.  (pfil will pass ARP and REVARP without
3069  * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
3070  * that interface.
3071  */
3072 static int
3073 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
3074 {
3075         int snap, error, i, hlen;
3076         struct ether_header *eh1, eh2;
3077         struct ip *ip;
3078         struct llc llc1;
3079         u_int16_t ether_type;
3080
3081         snap = 0;
3082         error = -1;     /* Default error if not error == 0 */
3083
3084 #if 0
3085         /* we may return with the IP fields swapped, ensure its not shared */
3086         KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
3087 #endif
3088
3089         if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0)
3090                 return (0); /* filtering is disabled */
3091
3092         i = min((*mp)->m_pkthdr.len, max_protohdr);
3093         if ((*mp)->m_len < i) {
3094             *mp = m_pullup(*mp, i);
3095             if (*mp == NULL) {
3096                 printf("%s: m_pullup failed\n", __func__);
3097                 return (-1);
3098             }
3099         }
3100
3101         eh1 = mtod(*mp, struct ether_header *);
3102         ether_type = ntohs(eh1->ether_type);
3103
3104         /*
3105          * Check for SNAP/LLC.
3106          */
3107         if (ether_type < ETHERMTU) {
3108                 struct llc *llc2 = (struct llc *)(eh1 + 1);
3109
3110                 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
3111                     llc2->llc_dsap == LLC_SNAP_LSAP &&
3112                     llc2->llc_ssap == LLC_SNAP_LSAP &&
3113                     llc2->llc_control == LLC_UI) {
3114                         ether_type = htons(llc2->llc_un.type_snap.ether_type);
3115                         snap = 1;
3116                 }
3117         }
3118
3119         /*
3120          * If we're trying to filter bridge traffic, don't look at anything
3121          * other than IP and ARP traffic.  If the filter doesn't understand
3122          * IPv6, don't allow IPv6 through the bridge either.  This is lame
3123          * since if we really wanted, say, an AppleTalk filter, we are hosed,
3124          * but of course we don't have an AppleTalk filter to begin with.
3125          * (Note that since pfil doesn't understand ARP it will pass *ALL*
3126          * ARP traffic.)
3127          */
3128         switch (ether_type) {
3129                 case ETHERTYPE_ARP:
3130                 case ETHERTYPE_REVARP:
3131                         if (V_pfil_ipfw_arp == 0)
3132                                 return (0); /* Automatically pass */
3133                         break;
3134
3135                 case ETHERTYPE_IP:
3136 #ifdef INET6
3137                 case ETHERTYPE_IPV6:
3138 #endif /* INET6 */
3139                         break;
3140                 default:
3141                         /*
3142                          * Check to see if the user wants to pass non-ip
3143                          * packets, these will not be checked by pfil(9) and
3144                          * passed unconditionally so the default is to drop.
3145                          */
3146                         if (V_pfil_onlyip)
3147                                 goto bad;
3148         }
3149
3150         /* Run the packet through pfil before stripping link headers */
3151         if (PFIL_HOOKED(&V_link_pfil_hook) && V_pfil_ipfw != 0 &&
3152                         dir == PFIL_OUT && ifp != NULL) {
3153
3154                 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL);
3155
3156                 if (*mp == NULL || error != 0) /* packet consumed by filter */
3157                         return (error);
3158         }
3159
3160         /* Strip off the Ethernet header and keep a copy. */
3161         m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
3162         m_adj(*mp, ETHER_HDR_LEN);
3163
3164         /* Strip off snap header, if present */
3165         if (snap) {
3166                 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
3167                 m_adj(*mp, sizeof(struct llc));
3168         }
3169
3170         /*
3171          * Check the IP header for alignment and errors
3172          */
3173         if (dir == PFIL_IN) {
3174                 switch (ether_type) {
3175                         case ETHERTYPE_IP:
3176                                 error = bridge_ip_checkbasic(mp);
3177                                 break;
3178 #ifdef INET6
3179                         case ETHERTYPE_IPV6:
3180                                 error = bridge_ip6_checkbasic(mp);
3181                                 break;
3182 #endif /* INET6 */
3183                         default:
3184                                 error = 0;
3185                 }
3186                 if (error)
3187                         goto bad;
3188         }
3189
3190         error = 0;
3191
3192         /*
3193          * Run the packet through pfil
3194          */
3195         switch (ether_type) {
3196         case ETHERTYPE_IP:
3197                 /*
3198                  * Run pfil on the member interface and the bridge, both can
3199                  * be skipped by clearing pfil_member or pfil_bridge.
3200                  *
3201                  * Keep the order:
3202                  *   in_if -> bridge_if -> out_if
3203                  */
3204                 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3205                         error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3206                                         dir, NULL);
3207
3208                 if (*mp == NULL || error != 0) /* filter may consume */
3209                         break;
3210
3211                 if (V_pfil_member && ifp != NULL)
3212                         error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp,
3213                                         dir, NULL);
3214
3215                 if (*mp == NULL || error != 0) /* filter may consume */
3216                         break;
3217
3218                 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL)
3219                         error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
3220                                         dir, NULL);
3221
3222                 if (*mp == NULL || error != 0) /* filter may consume */
3223                         break;
3224
3225                 /* check if we need to fragment the packet */
3226                 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) {
3227                         i = (*mp)->m_pkthdr.len;
3228                         if (i > ifp->if_mtu) {
3229                                 error = bridge_fragment(ifp, *mp, &eh2, snap,
3230                                             &llc1);
3231                                 return (error);
3232                         }
3233                 }
3234
3235                 /* Recalculate the ip checksum. */
3236                 ip = mtod(*mp, struct ip *);
3237                 hlen = ip->ip_hl << 2;
3238                 if (hlen < sizeof(struct ip))
3239                         goto bad;
3240                 if (hlen > (*mp)->m_len) {
3241                         if ((*mp = m_pullup(*mp, hlen)) == 0)
3242                                 goto bad;
3243                         ip = mtod(*mp, struct ip *);
3244                         if (ip == NULL)
3245                                 goto bad;
3246                 }
3247                 ip->ip_sum = 0;
3248                 if (hlen == sizeof(struct ip))
3249                         ip->ip_sum = in_cksum_hdr(ip);
3250                 else
3251                         ip->ip_sum = in_cksum(*mp, hlen);
3252
3253                 break;
3254 #ifdef INET6
3255         case ETHERTYPE_IPV6:
3256                 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL)
3257                         error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3258                                         dir, NULL);
3259
3260                 if (*mp == NULL || error != 0) /* filter may consume */
3261                         break;
3262
3263                 if (V_pfil_member && ifp != NULL)
3264                         error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp,
3265                                         dir, NULL);
3266
3267                 if (*mp == NULL || error != 0) /* filter may consume */
3268                         break;
3269
3270                 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL)
3271                         error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
3272                                         dir, NULL);
3273                 break;
3274 #endif
3275         default:
3276                 error = 0;
3277                 break;
3278         }
3279
3280         if (*mp == NULL)
3281                 return (error);
3282         if (error != 0)
3283                 goto bad;
3284
3285         error = -1;
3286
3287         /*
3288          * Finally, put everything back the way it was and return
3289          */
3290         if (snap) {
3291                 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT);
3292                 if (*mp == NULL)
3293                         return (error);
3294                 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
3295         }
3296
3297         M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT);
3298         if (*mp == NULL)
3299                 return (error);
3300         bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
3301
3302         return (0);
3303
3304 bad:
3305         m_freem(*mp);
3306         *mp = NULL;
3307         return (error);
3308 }
3309
3310 /*
3311  * Perform basic checks on header size since
3312  * pfil assumes ip_input has already processed
3313  * it for it.  Cut-and-pasted from ip_input.c.
3314  * Given how simple the IPv6 version is,
3315  * does the IPv4 version really need to be
3316  * this complicated?
3317  *
3318  * XXX Should we update ipstat here, or not?
3319  * XXX Right now we update ipstat but not
3320  * XXX csum_counter.
3321  */
3322 static int
3323 bridge_ip_checkbasic(struct mbuf **mp)
3324 {
3325         struct mbuf *m = *mp;
3326         struct ip *ip;
3327         int len, hlen;
3328         u_short sum;
3329
3330         if (*mp == NULL)
3331                 return (-1);
3332
3333         if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3334                 if ((m = m_copyup(m, sizeof(struct ip),
3335                         (max_linkhdr + 3) & ~3)) == NULL) {
3336                         /* XXXJRT new stat, please */
3337                         KMOD_IPSTAT_INC(ips_toosmall);
3338                         goto bad;
3339                 }
3340         } else if (__predict_false(m->m_len < sizeof (struct ip))) {
3341                 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
3342                         KMOD_IPSTAT_INC(ips_toosmall);
3343                         goto bad;
3344                 }
3345         }
3346         ip = mtod(m, struct ip *);
3347         if (ip == NULL) goto bad;
3348
3349         if (ip->ip_v != IPVERSION) {
3350                 KMOD_IPSTAT_INC(ips_badvers);
3351                 goto bad;
3352         }
3353         hlen = ip->ip_hl << 2;
3354         if (hlen < sizeof(struct ip)) { /* minimum header length */
3355                 KMOD_IPSTAT_INC(ips_badhlen);
3356                 goto bad;
3357         }
3358         if (hlen > m->m_len) {
3359                 if ((m = m_pullup(m, hlen)) == 0) {
3360                         KMOD_IPSTAT_INC(ips_badhlen);
3361                         goto bad;
3362                 }
3363                 ip = mtod(m, struct ip *);
3364                 if (ip == NULL) goto bad;
3365         }
3366
3367         if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
3368                 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
3369         } else {
3370                 if (hlen == sizeof(struct ip)) {
3371                         sum = in_cksum_hdr(ip);
3372                 } else {
3373                         sum = in_cksum(m, hlen);
3374                 }
3375         }
3376         if (sum) {
3377                 KMOD_IPSTAT_INC(ips_badsum);
3378                 goto bad;
3379         }
3380
3381         /* Retrieve the packet length. */
3382         len = ntohs(ip->ip_len);
3383
3384         /*
3385          * Check for additional length bogosity
3386          */
3387         if (len < hlen) {
3388                 KMOD_IPSTAT_INC(ips_badlen);
3389                 goto bad;
3390         }
3391
3392         /*
3393          * Check that the amount of data in the buffers
3394          * is as at least much as the IP header would have us expect.
3395          * Drop packet if shorter than we expect.
3396          */
3397         if (m->m_pkthdr.len < len) {
3398                 KMOD_IPSTAT_INC(ips_tooshort);
3399                 goto bad;
3400         }
3401
3402         /* Checks out, proceed */
3403         *mp = m;
3404         return (0);
3405
3406 bad:
3407         *mp = m;
3408         return (-1);
3409 }
3410
3411 #ifdef INET6
3412 /*
3413  * Same as above, but for IPv6.
3414  * Cut-and-pasted from ip6_input.c.
3415  * XXX Should we update ip6stat, or not?
3416  */
3417 static int
3418 bridge_ip6_checkbasic(struct mbuf **mp)
3419 {
3420         struct mbuf *m = *mp;
3421         struct ip6_hdr *ip6;
3422
3423         /*
3424          * If the IPv6 header is not aligned, slurp it up into a new
3425          * mbuf with space for link headers, in the event we forward
3426          * it.  Otherwise, if it is aligned, make sure the entire base
3427          * IPv6 header is in the first mbuf of the chain.
3428          */
3429         if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
3430                 struct ifnet *inifp = m->m_pkthdr.rcvif;
3431                 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
3432                             (max_linkhdr + 3) & ~3)) == NULL) {
3433                         /* XXXJRT new stat, please */
3434                         IP6STAT_INC(ip6s_toosmall);
3435                         in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3436                         goto bad;
3437                 }
3438         } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
3439                 struct ifnet *inifp = m->m_pkthdr.rcvif;
3440                 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
3441                         IP6STAT_INC(ip6s_toosmall);
3442                         in6_ifstat_inc(inifp, ifs6_in_hdrerr);
3443                         goto bad;
3444                 }
3445         }
3446
3447         ip6 = mtod(m, struct ip6_hdr *);
3448
3449         if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
3450                 IP6STAT_INC(ip6s_badvers);
3451                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
3452                 goto bad;
3453         }
3454
3455         /* Checks out, proceed */
3456         *mp = m;
3457         return (0);
3458
3459 bad:
3460         *mp = m;
3461         return (-1);
3462 }
3463 #endif /* INET6 */
3464
3465 /*
3466  * bridge_fragment:
3467  *
3468  *      Return a fragmented mbuf chain.
3469  */
3470 static int
3471 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh,
3472     int snap, struct llc *llc)
3473 {
3474         struct mbuf *m0;
3475         struct ip *ip;
3476         int error = -1;
3477
3478         if (m->m_len < sizeof(struct ip) &&
3479             (m = m_pullup(m, sizeof(struct ip))) == NULL)
3480                 goto out;
3481         ip = mtod(m, struct ip *);
3482
3483         m->m_pkthdr.csum_flags |= CSUM_IP;
3484         error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist);
3485         if (error)
3486                 goto out;
3487
3488         /* walk the chain and re-add the Ethernet header */
3489         for (m0 = m; m0; m0 = m0->m_nextpkt) {
3490                 if (error == 0) {
3491                         if (snap) {
3492                                 M_PREPEND(m0, sizeof(struct llc), M_NOWAIT);
3493                                 if (m0 == NULL) {
3494                                         error = ENOBUFS;
3495                                         continue;
3496                                 }
3497                                 bcopy(llc, mtod(m0, caddr_t),
3498                                     sizeof(struct llc));
3499                         }
3500                         M_PREPEND(m0, ETHER_HDR_LEN, M_NOWAIT);
3501                         if (m0 == NULL) {
3502                                 error = ENOBUFS;
3503                                 continue;
3504                         }
3505                         bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN);
3506                 } else
3507                         m_freem(m);
3508         }
3509
3510         if (error == 0)
3511                 KMOD_IPSTAT_INC(ips_fragmented);
3512
3513         return (error);
3514
3515 out:
3516         if (m != NULL)
3517                 m_freem(m);
3518         return (error);
3519 }
3520
3521 static void
3522 bridge_linkstate(struct ifnet *ifp)
3523 {
3524         struct bridge_softc *sc = ifp->if_bridge;
3525         struct bridge_iflist *bif;
3526
3527         BRIDGE_LOCK(sc);
3528         bif = bridge_lookup_member_if(sc, ifp);
3529         if (bif == NULL) {
3530                 BRIDGE_UNLOCK(sc);
3531                 return;
3532         }
3533         bridge_linkcheck(sc);
3534         BRIDGE_UNLOCK(sc);
3535
3536         bstp_linkstate(&bif->bif_stp);
3537 }
3538
3539 static void
3540 bridge_linkcheck(struct bridge_softc *sc)
3541 {
3542         struct bridge_iflist *bif;
3543         int new_link, hasls;
3544
3545         BRIDGE_LOCK_ASSERT(sc);
3546         new_link = LINK_STATE_DOWN;
3547         hasls = 0;
3548         /* Our link is considered up if at least one of our ports is active */
3549         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
3550                 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
3551                         hasls++;
3552                 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
3553                         new_link = LINK_STATE_UP;
3554                         break;
3555                 }
3556         }
3557         if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) {
3558                 /* If no interfaces support link-state then we default to up */
3559                 new_link = LINK_STATE_UP;
3560         }
3561         if_link_state_change(sc->sc_ifp, new_link);
3562 }