The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net/if_bridge.c

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    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: releng/7.4/sys/net/if_bridge.c 182861 2008-09-08 03:18:00Z thompsa $");
   79 
   80 #include "opt_inet.h"
   81 #include "opt_inet6.h"
   82 #include "opt_carp.h"
   83 
   84 #include <sys/param.h>
   85 #include <sys/mbuf.h>
   86 #include <sys/malloc.h>
   87 #include <sys/protosw.h>
   88 #include <sys/systm.h>
   89 #include <sys/time.h>
   90 #include <sys/socket.h> /* for net/if.h */
   91 #include <sys/sockio.h>
   92 #include <sys/ctype.h>  /* string functions */
   93 #include <sys/kernel.h>
   94 #include <sys/random.h>
   95 #include <sys/syslog.h>
   96 #include <sys/sysctl.h>
   97 #include <vm/uma.h>
   98 #include <sys/module.h>
   99 #include <sys/priv.h>
  100 #include <sys/proc.h>
  101 #include <sys/lock.h>
  102 #include <sys/mutex.h>
  103 
  104 #include <net/bpf.h>
  105 #include <net/if.h>
  106 #include <net/if_clone.h>
  107 #include <net/if_dl.h>
  108 #include <net/if_types.h>
  109 #include <net/if_var.h>
  110 #include <net/pfil.h>
  111 
  112 #include <netinet/in.h> /* for struct arpcom */
  113 #include <netinet/in_systm.h>
  114 #include <netinet/in_var.h>
  115 #include <netinet/ip.h>
  116 #include <netinet/ip_var.h>
  117 #ifdef INET6
  118 #include <netinet/ip6.h>
  119 #include <netinet6/ip6_var.h>
  120 #endif
  121 #ifdef DEV_CARP
  122 #include <netinet/ip_carp.h>
  123 #endif
  124 #include <machine/in_cksum.h>
  125 #include <netinet/if_ether.h> /* for struct arpcom */
  126 #include <net/bridgestp.h>
  127 #include <net/if_bridgevar.h>
  128 #include <net/if_llc.h>
  129 #include <net/if_vlan_var.h>
  130 
  131 #include <net/route.h>
  132 #include <netinet/ip_fw.h>
  133 #include <netinet/ip_dummynet.h>
  134 
  135 /*
  136  * Size of the route hash table.  Must be a power of two.
  137  */
  138 #ifndef BRIDGE_RTHASH_SIZE
  139 #define BRIDGE_RTHASH_SIZE              1024
  140 #endif
  141 
  142 #define BRIDGE_RTHASH_MASK              (BRIDGE_RTHASH_SIZE - 1)
  143 
  144 /*
  145  * Maximum number of addresses to cache.
  146  */
  147 #ifndef BRIDGE_RTABLE_MAX
  148 #define BRIDGE_RTABLE_MAX               100
  149 #endif
  150 
  151 /*
  152  * Timeout (in seconds) for entries learned dynamically.
  153  */
  154 #ifndef BRIDGE_RTABLE_TIMEOUT
  155 #define BRIDGE_RTABLE_TIMEOUT           (20 * 60)       /* same as ARP */
  156 #endif
  157 
  158 /*
  159  * Number of seconds between walks of the route list.
  160  */
  161 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
  162 #define BRIDGE_RTABLE_PRUNE_PERIOD      (5 * 60)
  163 #endif
  164 
  165 /*
  166  * List of capabilities to possibly mask on the member interface.
  167  */
  168 #define BRIDGE_IFCAPS_MASK              (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM)
  169 /*
  170  * List of capabilities to disable on the member interface.
  171  */
  172 #define BRIDGE_IFCAPS_STRIP             IFCAP_LRO
  173 
  174 /*
  175  * Bridge interface list entry.
  176  */
  177 struct bridge_iflist {
  178         LIST_ENTRY(bridge_iflist) bif_next;
  179         struct ifnet            *bif_ifp;       /* member if */
  180         struct bstp_port        bif_stp;        /* STP state */
  181         uint32_t                bif_flags;      /* member if flags */
  182         int                     bif_savedcaps;  /* saved capabilities */
  183         uint32_t                bif_addrmax;    /* max # of addresses */
  184         uint32_t                bif_addrcnt;    /* cur. # of addresses */
  185         uint32_t                bif_addrexceeded;/* # of address violations */
  186 };
  187 
  188 /*
  189  * Bridge route node.
  190  */
  191 struct bridge_rtnode {
  192         LIST_ENTRY(bridge_rtnode) brt_hash;     /* hash table linkage */
  193         LIST_ENTRY(bridge_rtnode) brt_list;     /* list linkage */
  194         struct bridge_iflist    *brt_dst;       /* destination if */
  195         unsigned long           brt_expire;     /* expiration time */
  196         uint8_t                 brt_flags;      /* address flags */
  197         uint8_t                 brt_addr[ETHER_ADDR_LEN];
  198         uint16_t                brt_vlan;       /* vlan id */
  199 };
  200 #define brt_ifp                 brt_dst->bif_ifp
  201 
  202 /*
  203  * Software state for each bridge.
  204  */
  205 struct bridge_softc {
  206         struct ifnet            *sc_ifp;        /* make this an interface */
  207         LIST_ENTRY(bridge_softc) sc_list;
  208         struct mtx              sc_mtx;
  209         struct cv               sc_cv;
  210         uint32_t                sc_brtmax;      /* max # of addresses */
  211         uint32_t                sc_brtcnt;      /* cur. # of addresses */
  212         uint32_t                sc_brttimeout;  /* rt timeout in seconds */
  213         struct callout          sc_brcallout;   /* bridge callout */
  214         uint32_t                sc_iflist_ref;  /* refcount for sc_iflist */
  215         uint32_t                sc_iflist_xcnt; /* refcount for sc_iflist */
  216         LIST_HEAD(, bridge_iflist) sc_iflist;   /* member interface list */
  217         LIST_HEAD(, bridge_rtnode) *sc_rthash;  /* our forwarding table */
  218         LIST_HEAD(, bridge_rtnode) sc_rtlist;   /* list version of above */
  219         uint32_t                sc_rthash_key;  /* key for hash */
  220         LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */
  221         struct bstp_state       sc_stp;         /* STP state */
  222         uint32_t                sc_brtexceeded; /* # of cache drops */
  223 };
  224 
  225 static struct mtx       bridge_list_mtx;
  226 eventhandler_tag        bridge_detach_cookie = NULL;
  227 
  228 int     bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
  229 
  230 uma_zone_t bridge_rtnode_zone;
  231 
  232 static int      bridge_clone_create(struct if_clone *, int, caddr_t);
  233 static void     bridge_clone_destroy(struct ifnet *);
  234 
  235 static int      bridge_ioctl(struct ifnet *, u_long, caddr_t);
  236 static void     bridge_mutecaps(struct bridge_softc *);
  237 static void     bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
  238                     int);
  239 static void     bridge_ifdetach(void *arg __unused, struct ifnet *);
  240 static void     bridge_init(void *);
  241 static void     bridge_dummynet(struct mbuf *, struct ifnet *);
  242 static void     bridge_stop(struct ifnet *, int);
  243 static void     bridge_start(struct ifnet *);
  244 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
  245 static int      bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
  246                     struct rtentry *);
  247 static void     bridge_enqueue(struct bridge_softc *, struct ifnet *,
  248                     struct mbuf *);
  249 static void     bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
  250 
  251 static void     bridge_forward(struct bridge_softc *, struct bridge_iflist *,
  252                     struct mbuf *m);
  253 
  254 static void     bridge_timer(void *);
  255 
  256 static void     bridge_broadcast(struct bridge_softc *, struct ifnet *,
  257                     struct mbuf *, int);
  258 static void     bridge_span(struct bridge_softc *, struct mbuf *);
  259 
  260 static int      bridge_rtupdate(struct bridge_softc *, const uint8_t *,
  261                     uint16_t, struct bridge_iflist *, int, uint8_t);
  262 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
  263                     uint16_t);
  264 static void     bridge_rttrim(struct bridge_softc *);
  265 static void     bridge_rtage(struct bridge_softc *);
  266 static void     bridge_rtflush(struct bridge_softc *, int);
  267 static int      bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
  268                     uint16_t);
  269 
  270 static int      bridge_rtable_init(struct bridge_softc *);
  271 static void     bridge_rtable_fini(struct bridge_softc *);
  272 
  273 static int      bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
  274 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
  275                     const uint8_t *, uint16_t);
  276 static int      bridge_rtnode_insert(struct bridge_softc *,
  277                     struct bridge_rtnode *);
  278 static void     bridge_rtnode_destroy(struct bridge_softc *,
  279                     struct bridge_rtnode *);
  280 static void     bridge_rtable_expire(struct ifnet *, int);
  281 static void     bridge_state_change(struct ifnet *, int);
  282 
  283 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
  284                     const char *name);
  285 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
  286                     struct ifnet *ifp);
  287 static void     bridge_delete_member(struct bridge_softc *,
  288                     struct bridge_iflist *, int);
  289 static void     bridge_delete_span(struct bridge_softc *,
  290                     struct bridge_iflist *);
  291 
  292 static int      bridge_ioctl_add(struct bridge_softc *, void *);
  293 static int      bridge_ioctl_del(struct bridge_softc *, void *);
  294 static int      bridge_ioctl_gifflags(struct bridge_softc *, void *);
  295 static int      bridge_ioctl_sifflags(struct bridge_softc *, void *);
  296 static int      bridge_ioctl_scache(struct bridge_softc *, void *);
  297 static int      bridge_ioctl_gcache(struct bridge_softc *, void *);
  298 static int      bridge_ioctl_gifs(struct bridge_softc *, void *);
  299 static int      bridge_ioctl_rts(struct bridge_softc *, void *);
  300 static int      bridge_ioctl_saddr(struct bridge_softc *, void *);
  301 static int      bridge_ioctl_sto(struct bridge_softc *, void *);
  302 static int      bridge_ioctl_gto(struct bridge_softc *, void *);
  303 static int      bridge_ioctl_daddr(struct bridge_softc *, void *);
  304 static int      bridge_ioctl_flush(struct bridge_softc *, void *);
  305 static int      bridge_ioctl_gpri(struct bridge_softc *, void *);
  306 static int      bridge_ioctl_spri(struct bridge_softc *, void *);
  307 static int      bridge_ioctl_ght(struct bridge_softc *, void *);
  308 static int      bridge_ioctl_sht(struct bridge_softc *, void *);
  309 static int      bridge_ioctl_gfd(struct bridge_softc *, void *);
  310 static int      bridge_ioctl_sfd(struct bridge_softc *, void *);
  311 static int      bridge_ioctl_gma(struct bridge_softc *, void *);
  312 static int      bridge_ioctl_sma(struct bridge_softc *, void *);
  313 static int      bridge_ioctl_sifprio(struct bridge_softc *, void *);
  314 static int      bridge_ioctl_sifcost(struct bridge_softc *, void *);
  315 static int      bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
  316 static int      bridge_ioctl_addspan(struct bridge_softc *, void *);
  317 static int      bridge_ioctl_delspan(struct bridge_softc *, void *);
  318 static int      bridge_ioctl_gbparam(struct bridge_softc *, void *);
  319 static int      bridge_ioctl_grte(struct bridge_softc *, void *);
  320 static int      bridge_ioctl_gifsstp(struct bridge_softc *, void *);
  321 static int      bridge_ioctl_sproto(struct bridge_softc *, void *);
  322 static int      bridge_ioctl_stxhc(struct bridge_softc *, void *);
  323 static int      bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
  324                     int);
  325 static int      bridge_ip_checkbasic(struct mbuf **mp);
  326 #ifdef INET6
  327 static int      bridge_ip6_checkbasic(struct mbuf **mp);
  328 #endif /* INET6 */
  329 static int      bridge_fragment(struct ifnet *, struct mbuf *,
  330                     struct ether_header *, int, struct llc *);
  331 
  332 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
  333 #define VLANTAGOF(_m)   \
  334     (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
  335 
  336 static struct bstp_cb_ops bridge_ops = {
  337         .bcb_state = bridge_state_change,
  338         .bcb_rtage = bridge_rtable_expire
  339 };
  340 
  341 SYSCTL_DECL(_net_link);
  342 SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
  343 
  344 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */
  345 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */
  346 static int pfil_member = 1; /* run pfil hooks on the member interface */
  347 static int pfil_ipfw = 0;   /* layer2 filter with ipfw */
  348 static int pfil_ipfw_arp = 0;   /* layer2 filter with ipfw */
  349 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for
  350                                    locally destined packets */
  351 static int log_stp   = 0;   /* log STP state changes */
  352 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW,
  353     &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled");
  354 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW,
  355     &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2");
  356 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW,
  357     &pfil_bridge, 0, "Packet filter on the bridge interface");
  358 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW,
  359     &pfil_member, 0, "Packet filter on the member interface");
  360 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW,
  361     &pfil_local_phys, 0,
  362     "Packet filter on the physical interface for locally destined packets");
  363 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW,
  364     &log_stp, 0, "Log STP state changes");
  365 
  366 struct bridge_control {
  367         int     (*bc_func)(struct bridge_softc *, void *);
  368         int     bc_argsize;
  369         int     bc_flags;
  370 };
  371 
  372 #define BC_F_COPYIN             0x01    /* copy arguments in */
  373 #define BC_F_COPYOUT            0x02    /* copy arguments out */
  374 #define BC_F_SUSER              0x04    /* do super-user check */
  375 
  376 const struct bridge_control bridge_control_table[] = {
  377         { bridge_ioctl_add,             sizeof(struct ifbreq),
  378           BC_F_COPYIN|BC_F_SUSER },
  379         { bridge_ioctl_del,             sizeof(struct ifbreq),
  380           BC_F_COPYIN|BC_F_SUSER },
  381 
  382         { bridge_ioctl_gifflags,        sizeof(struct ifbreq),
  383           BC_F_COPYIN|BC_F_COPYOUT },
  384         { bridge_ioctl_sifflags,        sizeof(struct ifbreq),
  385           BC_F_COPYIN|BC_F_SUSER },
  386 
  387         { bridge_ioctl_scache,          sizeof(struct ifbrparam),
  388           BC_F_COPYIN|BC_F_SUSER },
  389         { bridge_ioctl_gcache,          sizeof(struct ifbrparam),
  390           BC_F_COPYOUT },
  391 
  392         { bridge_ioctl_gifs,            sizeof(struct ifbifconf),
  393           BC_F_COPYIN|BC_F_COPYOUT },
  394         { bridge_ioctl_rts,             sizeof(struct ifbaconf),
  395           BC_F_COPYIN|BC_F_COPYOUT },
  396 
  397         { bridge_ioctl_saddr,           sizeof(struct ifbareq),
  398           BC_F_COPYIN|BC_F_SUSER },
  399 
  400         { bridge_ioctl_sto,             sizeof(struct ifbrparam),
  401           BC_F_COPYIN|BC_F_SUSER },
  402         { bridge_ioctl_gto,             sizeof(struct ifbrparam),
  403           BC_F_COPYOUT },
  404 
  405         { bridge_ioctl_daddr,           sizeof(struct ifbareq),
  406           BC_F_COPYIN|BC_F_SUSER },
  407 
  408         { bridge_ioctl_flush,           sizeof(struct ifbreq),
  409           BC_F_COPYIN|BC_F_SUSER },
  410 
  411         { bridge_ioctl_gpri,            sizeof(struct ifbrparam),
  412           BC_F_COPYOUT },
  413         { bridge_ioctl_spri,            sizeof(struct ifbrparam),
  414           BC_F_COPYIN|BC_F_SUSER },
  415 
  416         { bridge_ioctl_ght,             sizeof(struct ifbrparam),
  417           BC_F_COPYOUT },
  418         { bridge_ioctl_sht,             sizeof(struct ifbrparam),
  419           BC_F_COPYIN|BC_F_SUSER },
  420 
  421         { bridge_ioctl_gfd,             sizeof(struct ifbrparam),
  422           BC_F_COPYOUT },
  423         { bridge_ioctl_sfd,             sizeof(struct ifbrparam),
  424           BC_F_COPYIN|BC_F_SUSER },
  425 
  426         { bridge_ioctl_gma,             sizeof(struct ifbrparam),
  427           BC_F_COPYOUT },
  428         { bridge_ioctl_sma,             sizeof(struct ifbrparam),
  429           BC_F_COPYIN|BC_F_SUSER },
  430 
  431         { bridge_ioctl_sifprio,         sizeof(struct ifbreq),
  432           BC_F_COPYIN|BC_F_SUSER },
  433 
  434         { bridge_ioctl_sifcost,         sizeof(struct ifbreq),
  435           BC_F_COPYIN|BC_F_SUSER },
  436 
  437         { bridge_ioctl_addspan,         sizeof(struct ifbreq),
  438           BC_F_COPYIN|BC_F_SUSER },
  439         { bridge_ioctl_delspan,         sizeof(struct ifbreq),
  440           BC_F_COPYIN|BC_F_SUSER },
  441 
  442         { bridge_ioctl_gbparam,         sizeof(struct ifbropreq),
  443           BC_F_COPYOUT },
  444 
  445         { bridge_ioctl_grte,            sizeof(struct ifbrparam),
  446           BC_F_COPYOUT },
  447 
  448         { bridge_ioctl_gifsstp,         sizeof(struct ifbpstpconf),
  449           BC_F_COPYIN|BC_F_COPYOUT },
  450 
  451         { bridge_ioctl_sproto,          sizeof(struct ifbrparam),
  452           BC_F_COPYIN|BC_F_SUSER },
  453 
  454         { bridge_ioctl_stxhc,           sizeof(struct ifbrparam),
  455           BC_F_COPYIN|BC_F_SUSER },
  456 
  457         { bridge_ioctl_sifmaxaddr,      sizeof(struct ifbreq),
  458           BC_F_COPYIN|BC_F_SUSER },
  459 
  460 };
  461 const int bridge_control_table_size =
  462     sizeof(bridge_control_table) / sizeof(bridge_control_table[0]);
  463 
  464 LIST_HEAD(, bridge_softc) bridge_list;
  465 
  466 IFC_SIMPLE_DECLARE(bridge, 0);
  467 
  468 static int
  469 bridge_modevent(module_t mod, int type, void *data)
  470 {
  471 
  472         switch (type) {
  473         case MOD_LOAD:
  474                 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF);
  475                 if_clone_attach(&bridge_cloner);
  476                 bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
  477                     sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
  478                     UMA_ALIGN_PTR, 0);
  479                 LIST_INIT(&bridge_list);
  480                 bridge_input_p = bridge_input;
  481                 bridge_output_p = bridge_output;
  482                 bridge_dn_p = bridge_dummynet;
  483                 bridge_detach_cookie = EVENTHANDLER_REGISTER(
  484                     ifnet_departure_event, bridge_ifdetach, NULL,
  485                     EVENTHANDLER_PRI_ANY);
  486                 break;
  487         case MOD_UNLOAD:
  488                 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
  489                     bridge_detach_cookie);
  490                 if_clone_detach(&bridge_cloner);
  491                 uma_zdestroy(bridge_rtnode_zone);
  492                 bridge_input_p = NULL;
  493                 bridge_output_p = NULL;
  494                 bridge_dn_p = NULL;
  495                 mtx_destroy(&bridge_list_mtx);
  496                 break;
  497         default:
  498                 return (EOPNOTSUPP);
  499         }
  500         return (0);
  501 }
  502 
  503 static moduledata_t bridge_mod = {
  504         "if_bridge",
  505         bridge_modevent,
  506         0
  507 };
  508 
  509 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
  510 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
  511 
  512 /*
  513  * handler for net.link.bridge.pfil_ipfw
  514  */
  515 static int
  516 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
  517 {
  518         int enable = pfil_ipfw;
  519         int error;
  520 
  521         error = sysctl_handle_int(oidp, &enable, 0, req);
  522         enable = (enable) ? 1 : 0;
  523 
  524         if (enable != pfil_ipfw) {
  525                 pfil_ipfw = enable;
  526 
  527                 /*
  528                  * Disable pfil so that ipfw doesnt run twice, if the user
  529                  * really wants both then they can re-enable pfil_bridge and/or
  530                  * pfil_member. Also allow non-ip packets as ipfw can filter by
  531                  * layer2 type.
  532                  */
  533                 if (pfil_ipfw) {
  534                         pfil_onlyip = 0;
  535                         pfil_bridge = 0;
  536                         pfil_member = 0;
  537                 }
  538         }
  539 
  540         return (error);
  541 }
  542 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW,
  543             &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW");
  544 
  545 /*
  546  * bridge_clone_create:
  547  *
  548  *      Create a new bridge instance.
  549  */
  550 static int
  551 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
  552 {
  553         struct bridge_softc *sc, *sc2;
  554         struct ifnet *bifp, *ifp;
  555         u_char eaddr[6];
  556         int retry;
  557 
  558         sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
  559         ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
  560         if (ifp == NULL) {
  561                 free(sc, M_DEVBUF);
  562                 return (ENOSPC);
  563         }
  564 
  565         BRIDGE_LOCK_INIT(sc);
  566         sc->sc_brtmax = BRIDGE_RTABLE_MAX;
  567         sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
  568 
  569         /* Initialize our routing table. */
  570         bridge_rtable_init(sc);
  571 
  572         callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
  573 
  574         LIST_INIT(&sc->sc_iflist);
  575         LIST_INIT(&sc->sc_spanlist);
  576 
  577         ifp->if_softc = sc;
  578         if_initname(ifp, ifc->ifc_name, unit);
  579         ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
  580         ifp->if_ioctl = bridge_ioctl;
  581         ifp->if_start = bridge_start;
  582         ifp->if_init = bridge_init;
  583         ifp->if_type = IFT_BRIDGE;
  584         IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
  585         ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
  586         IFQ_SET_READY(&ifp->if_snd);
  587 
  588         /*
  589          * Generate a random ethernet address with a locally administered
  590          * address.
  591          *
  592          * Since we are using random ethernet addresses for the bridge, it is
  593          * possible that we might have address collisions, so make sure that
  594          * this hardware address isn't already in use on another bridge.
  595          */
  596         for (retry = 1; retry != 0;) {
  597                 arc4rand(eaddr, ETHER_ADDR_LEN, 1);
  598                 eaddr[0] &= ~1;         /* clear multicast bit */
  599                 eaddr[0] |= 2;          /* set the LAA bit */
  600                 retry = 0;
  601                 mtx_lock(&bridge_list_mtx);
  602                 LIST_FOREACH(sc2, &bridge_list, sc_list) {
  603                         bifp = sc2->sc_ifp;
  604                         if (memcmp(eaddr, IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0)
  605                                 retry = 1;
  606                 }
  607                 mtx_unlock(&bridge_list_mtx);
  608         }
  609 
  610         bstp_attach(&sc->sc_stp, &bridge_ops);
  611         ether_ifattach(ifp, eaddr);
  612         /* Now undo some of the damage... */
  613         ifp->if_baudrate = 0;
  614         ifp->if_type = IFT_BRIDGE;
  615 
  616         mtx_lock(&bridge_list_mtx);
  617         LIST_INSERT_HEAD(&bridge_list, sc, sc_list);
  618         mtx_unlock(&bridge_list_mtx);
  619 
  620         return (0);
  621 }
  622 
  623 /*
  624  * bridge_clone_destroy:
  625  *
  626  *      Destroy a bridge instance.
  627  */
  628 static void
  629 bridge_clone_destroy(struct ifnet *ifp)
  630 {
  631         struct bridge_softc *sc = ifp->if_softc;
  632         struct bridge_iflist *bif;
  633 
  634         BRIDGE_LOCK(sc);
  635 
  636         bridge_stop(ifp, 1);
  637         ifp->if_flags &= ~IFF_UP;
  638 
  639         while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
  640                 bridge_delete_member(sc, bif, 0);
  641 
  642         while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
  643                 bridge_delete_span(sc, bif);
  644         }
  645 
  646         BRIDGE_UNLOCK(sc);
  647 
  648         callout_drain(&sc->sc_brcallout);
  649 
  650         mtx_lock(&bridge_list_mtx);
  651         LIST_REMOVE(sc, sc_list);
  652         mtx_unlock(&bridge_list_mtx);
  653 
  654         bstp_detach(&sc->sc_stp);
  655         ether_ifdetach(ifp);
  656         if_free_type(ifp, IFT_ETHER);
  657 
  658         /* Tear down the routing table. */
  659         bridge_rtable_fini(sc);
  660 
  661         BRIDGE_LOCK_DESTROY(sc);
  662         free(sc, M_DEVBUF);
  663 }
  664 
  665 /*
  666  * bridge_ioctl:
  667  *
  668  *      Handle a control request from the operator.
  669  */
  670 static int
  671 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
  672 {
  673         struct bridge_softc *sc = ifp->if_softc;
  674         struct thread *td = curthread;
  675         union {
  676                 struct ifbreq ifbreq;
  677                 struct ifbifconf ifbifconf;
  678                 struct ifbareq ifbareq;
  679                 struct ifbaconf ifbaconf;
  680                 struct ifbrparam ifbrparam;
  681                 struct ifbropreq ifbropreq;
  682         } args;
  683         struct ifdrv *ifd = (struct ifdrv *) data;
  684         const struct bridge_control *bc;
  685         int error = 0;
  686 
  687         switch (cmd) {
  688 
  689         case SIOCADDMULTI:
  690         case SIOCDELMULTI:
  691                 break;
  692 
  693         case SIOCGDRVSPEC:
  694         case SIOCSDRVSPEC:
  695                 if (ifd->ifd_cmd >= bridge_control_table_size) {
  696                         error = EINVAL;
  697                         break;
  698                 }
  699                 bc = &bridge_control_table[ifd->ifd_cmd];
  700 
  701                 if (cmd == SIOCGDRVSPEC &&
  702                     (bc->bc_flags & BC_F_COPYOUT) == 0) {
  703                         error = EINVAL;
  704                         break;
  705                 }
  706                 else if (cmd == SIOCSDRVSPEC &&
  707                     (bc->bc_flags & BC_F_COPYOUT) != 0) {
  708                         error = EINVAL;
  709                         break;
  710                 }
  711 
  712                 if (bc->bc_flags & BC_F_SUSER) {
  713                         error = priv_check(td, PRIV_NET_BRIDGE);
  714                         if (error)
  715                                 break;
  716                 }
  717 
  718                 if (ifd->ifd_len != bc->bc_argsize ||
  719                     ifd->ifd_len > sizeof(args)) {
  720                         error = EINVAL;
  721                         break;
  722                 }
  723 
  724                 bzero(&args, sizeof(args));
  725                 if (bc->bc_flags & BC_F_COPYIN) {
  726                         error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
  727                         if (error)
  728                                 break;
  729                 }
  730 
  731                 BRIDGE_LOCK(sc);
  732                 error = (*bc->bc_func)(sc, &args);
  733                 BRIDGE_UNLOCK(sc);
  734                 if (error)
  735                         break;
  736 
  737                 if (bc->bc_flags & BC_F_COPYOUT)
  738                         error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
  739 
  740                 break;
  741 
  742         case SIOCSIFFLAGS:
  743                 if (!(ifp->if_flags & IFF_UP) &&
  744                     (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
  745                         /*
  746                          * If interface is marked down and it is running,
  747                          * then stop and disable it.
  748                          */
  749                         BRIDGE_LOCK(sc);
  750                         bridge_stop(ifp, 1);
  751                         BRIDGE_UNLOCK(sc);
  752                 } else if ((ifp->if_flags & IFF_UP) &&
  753                     !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
  754                         /*
  755                          * If interface is marked up and it is stopped, then
  756                          * start it.
  757                          */
  758                         (*ifp->if_init)(sc);
  759                 }
  760                 break;
  761 
  762         case SIOCSIFMTU:
  763                 /* Do not allow the MTU to be changed on the bridge */
  764                 error = EINVAL;
  765                 break;
  766 
  767         default:
  768                 /*
  769                  * drop the lock as ether_ioctl() will call bridge_start() and
  770                  * cause the lock to be recursed.
  771                  */
  772                 error = ether_ioctl(ifp, cmd, data);
  773                 break;
  774         }
  775 
  776         return (error);
  777 }
  778 
  779 /*
  780  * bridge_mutecaps:
  781  *
  782  *      Clear or restore unwanted capabilities on the member interface
  783  */
  784 static void
  785 bridge_mutecaps(struct bridge_softc *sc)
  786 {
  787         struct bridge_iflist *bif;
  788         int enabled, mask;
  789 
  790         /* Initial bitmask of capabilities to test */
  791         mask = BRIDGE_IFCAPS_MASK;
  792 
  793         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
  794                 /* Every member must support it or its disabled */
  795                 mask &= bif->bif_savedcaps;
  796         }
  797 
  798         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
  799                 enabled = bif->bif_ifp->if_capenable;
  800                 enabled &= ~BRIDGE_IFCAPS_STRIP;
  801                 /* strip off mask bits and enable them again if allowed */
  802                 enabled &= ~BRIDGE_IFCAPS_MASK;
  803                 enabled |= mask;
  804 
  805                 bridge_set_ifcap(sc, bif, enabled);
  806         }
  807 
  808 }
  809 
  810 static void
  811 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
  812 {
  813         struct ifnet *ifp = bif->bif_ifp;
  814         struct ifreq ifr;
  815         int error;
  816 
  817         bzero(&ifr, sizeof(ifr));
  818         ifr.ifr_reqcap = set;
  819 
  820         if (ifp->if_capenable != set) {
  821                 IFF_LOCKGIANT(ifp);
  822                 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
  823                 IFF_UNLOCKGIANT(ifp);
  824                 if (error)
  825                         if_printf(sc->sc_ifp,
  826                             "error setting interface capabilities on %s\n",
  827                             ifp->if_xname);
  828         }
  829 }
  830 
  831 /*
  832  * bridge_lookup_member:
  833  *
  834  *      Lookup a bridge member interface.
  835  */
  836 static struct bridge_iflist *
  837 bridge_lookup_member(struct bridge_softc *sc, const char *name)
  838 {
  839         struct bridge_iflist *bif;
  840         struct ifnet *ifp;
  841 
  842         BRIDGE_LOCK_ASSERT(sc);
  843 
  844         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
  845                 ifp = bif->bif_ifp;
  846                 if (strcmp(ifp->if_xname, name) == 0)
  847                         return (bif);
  848         }
  849 
  850         return (NULL);
  851 }
  852 
  853 /*
  854  * bridge_lookup_member_if:
  855  *
  856  *      Lookup a bridge member interface by ifnet*.
  857  */
  858 static struct bridge_iflist *
  859 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
  860 {
  861         struct bridge_iflist *bif;
  862 
  863         BRIDGE_LOCK_ASSERT(sc);
  864 
  865         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
  866                 if (bif->bif_ifp == member_ifp)
  867                         return (bif);
  868         }
  869 
  870         return (NULL);
  871 }
  872 
  873 /*
  874  * bridge_delete_member:
  875  *
  876  *      Delete the specified member interface.
  877  */
  878 static void
  879 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
  880     int gone)
  881 {
  882         struct ifnet *ifs = bif->bif_ifp;
  883 
  884         BRIDGE_LOCK_ASSERT(sc);
  885 
  886         if (!gone) {
  887                 switch (ifs->if_type) {
  888                 case IFT_ETHER:
  889                 case IFT_L2VLAN:
  890                         /*
  891                          * Take the interface out of promiscuous mode.
  892                          */
  893                         (void) ifpromisc(ifs, 0);
  894                         break;
  895 
  896                 case IFT_GIF:
  897                         break;
  898 
  899                 default:
  900 #ifdef DIAGNOSTIC
  901                         panic("bridge_delete_member: impossible");
  902 #endif
  903                         break;
  904                 }
  905                 /* reneable any interface capabilities */
  906                 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
  907         }
  908 
  909         if (bif->bif_flags & IFBIF_STP)
  910                 bstp_disable(&bif->bif_stp);
  911 
  912         ifs->if_bridge = NULL;
  913         BRIDGE_XLOCK(sc);
  914         LIST_REMOVE(bif, bif_next);
  915         BRIDGE_XDROP(sc);
  916 
  917         bridge_mutecaps(sc);    /* recalcuate now this interface is removed */
  918         bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
  919         KASSERT(bif->bif_addrcnt == 0,
  920             ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
  921 
  922         BRIDGE_UNLOCK(sc);
  923         bstp_destroy(&bif->bif_stp);    /* prepare to free */
  924         BRIDGE_LOCK(sc);
  925         free(bif, M_DEVBUF);
  926 }
  927 
  928 /*
  929  * bridge_delete_span:
  930  *
  931  *      Delete the specified span interface.
  932  */
  933 static void
  934 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
  935 {
  936         BRIDGE_LOCK_ASSERT(sc);
  937 
  938         KASSERT(bif->bif_ifp->if_bridge == NULL,
  939             ("%s: not a span interface", __func__));
  940 
  941         LIST_REMOVE(bif, bif_next);
  942         free(bif, M_DEVBUF);
  943 }
  944 
  945 static int
  946 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
  947 {
  948         struct ifbreq *req = arg;
  949         struct bridge_iflist *bif = NULL;
  950         struct ifnet *ifs;
  951         int error = 0;
  952 
  953         ifs = ifunit(req->ifbr_ifsname);
  954         if (ifs == NULL)
  955                 return (ENOENT);
  956         if (ifs->if_ioctl == NULL)      /* must be supported */
  957                 return (EINVAL);
  958 
  959         /* If it's in the span list, it can't be a member. */
  960         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
  961                 if (ifs == bif->bif_ifp)
  962                         return (EBUSY);
  963 
  964         /* Allow the first Ethernet member to define the MTU */
  965         if (ifs->if_type != IFT_GIF) {
  966                 if (LIST_EMPTY(&sc->sc_iflist))
  967                         sc->sc_ifp->if_mtu = ifs->if_mtu;
  968                 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
  969                         if_printf(sc->sc_ifp, "invalid MTU for %s\n",
  970                             ifs->if_xname);
  971                         return (EINVAL);
  972                 }
  973         }
  974 
  975         if (ifs->if_bridge == sc)
  976                 return (EEXIST);
  977 
  978         if (ifs->if_bridge != NULL)
  979                 return (EBUSY);
  980 
  981         bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
  982         if (bif == NULL)
  983                 return (ENOMEM);
  984 
  985         bif->bif_ifp = ifs;
  986         bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
  987         bif->bif_savedcaps = ifs->if_capenable;
  988 
  989         switch (ifs->if_type) {
  990         case IFT_ETHER:
  991         case IFT_L2VLAN:
  992                 /*
  993                  * Place the interface into promiscuous mode.
  994                  */
  995                 error = ifpromisc(ifs, 1);
  996                 if (error)
  997                         goto out;
  998                 break;
  999 
 1000         case IFT_GIF:
 1001                 break;
 1002 
 1003         default:
 1004                 error = EINVAL;
 1005                 goto out;
 1006         }
 1007 
 1008         ifs->if_bridge = sc;
 1009         bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
 1010         /*
 1011          * XXX: XLOCK HERE!?!
 1012          *
 1013          * NOTE: insert_***HEAD*** should be safe for the traversals.
 1014          */
 1015         LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
 1016 
 1017         /* Set interface capabilities to the intersection set of all members */
 1018         bridge_mutecaps(sc);
 1019 out:
 1020         if (error) {
 1021                 if (bif != NULL)
 1022                         free(bif, M_DEVBUF);
 1023         }
 1024         return (error);
 1025 }
 1026 
 1027 static int
 1028 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
 1029 {
 1030         struct ifbreq *req = arg;
 1031         struct bridge_iflist *bif;
 1032 
 1033         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
 1034         if (bif == NULL)
 1035                 return (ENOENT);
 1036 
 1037         bridge_delete_member(sc, bif, 0);
 1038 
 1039         return (0);
 1040 }
 1041 
 1042 static int
 1043 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
 1044 {
 1045         struct ifbreq *req = arg;
 1046         struct bridge_iflist *bif;
 1047         struct bstp_port *bp;
 1048 
 1049         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
 1050         if (bif == NULL)
 1051                 return (ENOENT);
 1052 
 1053         bp = &bif->bif_stp;
 1054         req->ifbr_ifsflags = bif->bif_flags;
 1055         req->ifbr_state = bp->bp_state;
 1056         req->ifbr_priority = bp->bp_priority;
 1057         req->ifbr_path_cost = bp->bp_path_cost;
 1058         req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
 1059         req->ifbr_proto = bp->bp_protover;
 1060         req->ifbr_role = bp->bp_role;
 1061         req->ifbr_stpflags = bp->bp_flags;
 1062         req->ifbr_addrcnt = bif->bif_addrcnt;
 1063         req->ifbr_addrmax = bif->bif_addrmax;
 1064         req->ifbr_addrexceeded = bif->bif_addrexceeded;
 1065 
 1066         /* Copy STP state options as flags */
 1067         if (bp->bp_operedge)
 1068                 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
 1069         if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
 1070                 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
 1071         if (bp->bp_ptp_link)
 1072                 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
 1073         if (bp->bp_flags & BSTP_PORT_AUTOPTP)
 1074                 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
 1075         if (bp->bp_flags & BSTP_PORT_ADMEDGE)
 1076                 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
 1077         if (bp->bp_flags & BSTP_PORT_ADMCOST)
 1078                 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
 1079         return (0);
 1080 }
 1081 
 1082 static int
 1083 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
 1084 {
 1085         struct ifbreq *req = arg;
 1086         struct bridge_iflist *bif;
 1087         struct bstp_port *bp;
 1088         int error;
 1089 
 1090         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
 1091         if (bif == NULL)
 1092                 return (ENOENT);
 1093         bp = &bif->bif_stp;
 1094 
 1095         if (req->ifbr_ifsflags & IFBIF_SPAN)
 1096                 /* SPAN is readonly */
 1097                 return (EINVAL);
 1098 
 1099         if (req->ifbr_ifsflags & IFBIF_STP) {
 1100                 if ((bif->bif_flags & IFBIF_STP) == 0) {
 1101                         error = bstp_enable(&bif->bif_stp);
 1102                         if (error)
 1103                                 return (error);
 1104                 }
 1105         } else {
 1106                 if ((bif->bif_flags & IFBIF_STP) != 0)
 1107                         bstp_disable(&bif->bif_stp);
 1108         }
 1109 
 1110         /* Pass on STP flags */
 1111         bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
 1112         bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
 1113         bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
 1114         bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
 1115 
 1116         /* Save the bits relating to the bridge */
 1117         bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
 1118 
 1119         return (0);
 1120 }
 1121 
 1122 static int
 1123 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
 1124 {
 1125         struct ifbrparam *param = arg;
 1126 
 1127         sc->sc_brtmax = param->ifbrp_csize;
 1128         bridge_rttrim(sc);
 1129 
 1130         return (0);
 1131 }
 1132 
 1133 static int
 1134 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
 1135 {
 1136         struct ifbrparam *param = arg;
 1137 
 1138         param->ifbrp_csize = sc->sc_brtmax;
 1139 
 1140         return (0);
 1141 }
 1142 
 1143 static int
 1144 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
 1145 {
 1146         struct ifbifconf *bifc = arg;
 1147         struct bridge_iflist *bif;
 1148         struct ifbreq breq;
 1149         char *buf, *outbuf;
 1150         int count, buflen, len, error = 0;
 1151 
 1152         count = 0;
 1153         LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
 1154                 count++;
 1155         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
 1156                 count++;
 1157 
 1158         buflen = sizeof(breq) * count;
 1159         if (bifc->ifbic_len == 0) {
 1160                 bifc->ifbic_len = buflen;
 1161                 return (0);
 1162         }
 1163         BRIDGE_UNLOCK(sc);
 1164         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
 1165         BRIDGE_LOCK(sc);
 1166 
 1167         count = 0;
 1168         buf = outbuf;
 1169         len = min(bifc->ifbic_len, buflen);
 1170         bzero(&breq, sizeof(breq));
 1171         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 1172                 if (len < sizeof(breq))
 1173                         break;
 1174 
 1175                 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
 1176                     sizeof(breq.ifbr_ifsname));
 1177                 /* Fill in the ifbreq structure */
 1178                 error = bridge_ioctl_gifflags(sc, &breq);
 1179                 if (error)
 1180                         break;
 1181                 memcpy(buf, &breq, sizeof(breq));
 1182                 count++;
 1183                 buf += sizeof(breq);
 1184                 len -= sizeof(breq);
 1185         }
 1186         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
 1187                 if (len < sizeof(breq))
 1188                         break;
 1189 
 1190                 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
 1191                     sizeof(breq.ifbr_ifsname));
 1192                 breq.ifbr_ifsflags = bif->bif_flags;
 1193                 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
 1194                 memcpy(buf, &breq, sizeof(breq));
 1195                 count++;
 1196                 buf += sizeof(breq);
 1197                 len -= sizeof(breq);
 1198         }
 1199 
 1200         BRIDGE_UNLOCK(sc);
 1201         bifc->ifbic_len = sizeof(breq) * count;
 1202         error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
 1203         BRIDGE_LOCK(sc);
 1204         free(outbuf, M_TEMP);
 1205         return (error);
 1206 }
 1207 
 1208 static int
 1209 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
 1210 {
 1211         struct ifbaconf *bac = arg;
 1212         struct bridge_rtnode *brt;
 1213         struct ifbareq bareq;
 1214         char *buf, *outbuf;
 1215         int count, buflen, len, error = 0;
 1216 
 1217         if (bac->ifbac_len == 0)
 1218                 return (0);
 1219 
 1220         count = 0;
 1221         LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
 1222                 count++;
 1223         buflen = sizeof(bareq) * count;
 1224 
 1225         BRIDGE_UNLOCK(sc);
 1226         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
 1227         BRIDGE_LOCK(sc);
 1228 
 1229         count = 0;
 1230         buf = outbuf;
 1231         len = min(bac->ifbac_len, buflen);
 1232         bzero(&bareq, sizeof(bareq));
 1233         LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
 1234                 if (len < sizeof(bareq))
 1235                         goto out;
 1236                 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
 1237                     sizeof(bareq.ifba_ifsname));
 1238                 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
 1239                 bareq.ifba_vlan = brt->brt_vlan;
 1240                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
 1241                                 time_uptime < brt->brt_expire)
 1242                         bareq.ifba_expire = brt->brt_expire - time_uptime;
 1243                 else
 1244                         bareq.ifba_expire = 0;
 1245                 bareq.ifba_flags = brt->brt_flags;
 1246 
 1247                 memcpy(buf, &bareq, sizeof(bareq));
 1248                 count++;
 1249                 buf += sizeof(bareq);
 1250                 len -= sizeof(bareq);
 1251         }
 1252 out:
 1253         BRIDGE_UNLOCK(sc);
 1254         bac->ifbac_len = sizeof(bareq) * count;
 1255         error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
 1256         BRIDGE_LOCK(sc);
 1257         free(outbuf, M_TEMP);
 1258         return (error);
 1259 }
 1260 
 1261 static int
 1262 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
 1263 {
 1264         struct ifbareq *req = arg;
 1265         struct bridge_iflist *bif;
 1266         int error;
 1267 
 1268         bif = bridge_lookup_member(sc, req->ifba_ifsname);
 1269         if (bif == NULL)
 1270                 return (ENOENT);
 1271 
 1272         error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
 1273             req->ifba_flags);
 1274 
 1275         return (error);
 1276 }
 1277 
 1278 static int
 1279 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
 1280 {
 1281         struct ifbrparam *param = arg;
 1282 
 1283         sc->sc_brttimeout = param->ifbrp_ctime;
 1284         return (0);
 1285 }
 1286 
 1287 static int
 1288 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
 1289 {
 1290         struct ifbrparam *param = arg;
 1291 
 1292         param->ifbrp_ctime = sc->sc_brttimeout;
 1293         return (0);
 1294 }
 1295 
 1296 static int
 1297 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
 1298 {
 1299         struct ifbareq *req = arg;
 1300 
 1301         return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
 1302 }
 1303 
 1304 static int
 1305 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
 1306 {
 1307         struct ifbreq *req = arg;
 1308 
 1309         bridge_rtflush(sc, req->ifbr_ifsflags);
 1310         return (0);
 1311 }
 1312 
 1313 static int
 1314 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
 1315 {
 1316         struct ifbrparam *param = arg;
 1317         struct bstp_state *bs = &sc->sc_stp;
 1318 
 1319         param->ifbrp_prio = bs->bs_bridge_priority;
 1320         return (0);
 1321 }
 1322 
 1323 static int
 1324 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
 1325 {
 1326         struct ifbrparam *param = arg;
 1327 
 1328         return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
 1329 }
 1330 
 1331 static int
 1332 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
 1333 {
 1334         struct ifbrparam *param = arg;
 1335         struct bstp_state *bs = &sc->sc_stp;
 1336 
 1337         param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
 1338         return (0);
 1339 }
 1340 
 1341 static int
 1342 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
 1343 {
 1344         struct ifbrparam *param = arg;
 1345 
 1346         return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
 1347 }
 1348 
 1349 static int
 1350 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
 1351 {
 1352         struct ifbrparam *param = arg;
 1353         struct bstp_state *bs = &sc->sc_stp;
 1354 
 1355         param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
 1356         return (0);
 1357 }
 1358 
 1359 static int
 1360 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
 1361 {
 1362         struct ifbrparam *param = arg;
 1363 
 1364         return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
 1365 }
 1366 
 1367 static int
 1368 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
 1369 {
 1370         struct ifbrparam *param = arg;
 1371         struct bstp_state *bs = &sc->sc_stp;
 1372 
 1373         param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
 1374         return (0);
 1375 }
 1376 
 1377 static int
 1378 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
 1379 {
 1380         struct ifbrparam *param = arg;
 1381 
 1382         return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
 1383 }
 1384 
 1385 static int
 1386 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
 1387 {
 1388         struct ifbreq *req = arg;
 1389         struct bridge_iflist *bif;
 1390 
 1391         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
 1392         if (bif == NULL)
 1393                 return (ENOENT);
 1394 
 1395         return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
 1396 }
 1397 
 1398 static int
 1399 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
 1400 {
 1401         struct ifbreq *req = arg;
 1402         struct bridge_iflist *bif;
 1403 
 1404         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
 1405         if (bif == NULL)
 1406                 return (ENOENT);
 1407 
 1408         return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
 1409 }
 1410 
 1411 static int
 1412 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
 1413 {
 1414         struct ifbreq *req = arg;
 1415         struct bridge_iflist *bif;
 1416 
 1417         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
 1418         if (bif == NULL)
 1419                 return (ENOENT);
 1420 
 1421         bif->bif_addrmax = req->ifbr_addrmax;
 1422         return (0);
 1423 }
 1424 
 1425 static int
 1426 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
 1427 {
 1428         struct ifbreq *req = arg;
 1429         struct bridge_iflist *bif = NULL;
 1430         struct ifnet *ifs;
 1431 
 1432         ifs = ifunit(req->ifbr_ifsname);
 1433         if (ifs == NULL)
 1434                 return (ENOENT);
 1435 
 1436         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
 1437                 if (ifs == bif->bif_ifp)
 1438                         return (EBUSY);
 1439 
 1440         if (ifs->if_bridge != NULL)
 1441                 return (EBUSY);
 1442 
 1443         switch (ifs->if_type) {
 1444                 case IFT_ETHER:
 1445                 case IFT_GIF:
 1446                 case IFT_L2VLAN:
 1447                         break;
 1448                 default:
 1449                         return (EINVAL);
 1450         }
 1451 
 1452         bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
 1453         if (bif == NULL)
 1454                 return (ENOMEM);
 1455 
 1456         bif->bif_ifp = ifs;
 1457         bif->bif_flags = IFBIF_SPAN;
 1458 
 1459         LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
 1460 
 1461         return (0);
 1462 }
 1463 
 1464 static int
 1465 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
 1466 {
 1467         struct ifbreq *req = arg;
 1468         struct bridge_iflist *bif;
 1469         struct ifnet *ifs;
 1470 
 1471         ifs = ifunit(req->ifbr_ifsname);
 1472         if (ifs == NULL)
 1473                 return (ENOENT);
 1474 
 1475         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
 1476                 if (ifs == bif->bif_ifp)
 1477                         break;
 1478 
 1479         if (bif == NULL)
 1480                 return (ENOENT);
 1481 
 1482         bridge_delete_span(sc, bif);
 1483 
 1484         return (0);
 1485 }
 1486 
 1487 static int
 1488 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
 1489 {
 1490         struct ifbropreq *req = arg;
 1491         struct bstp_state *bs = &sc->sc_stp;
 1492         struct bstp_port *root_port;
 1493 
 1494         req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
 1495         req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
 1496         req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
 1497 
 1498         root_port = bs->bs_root_port;
 1499         if (root_port == NULL)
 1500                 req->ifbop_root_port = 0;
 1501         else
 1502                 req->ifbop_root_port = root_port->bp_ifp->if_index;
 1503 
 1504         req->ifbop_holdcount = bs->bs_txholdcount;
 1505         req->ifbop_priority = bs->bs_bridge_priority;
 1506         req->ifbop_protocol = bs->bs_protover;
 1507         req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
 1508         req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
 1509         req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
 1510         req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
 1511         req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
 1512         req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
 1513 
 1514         return (0);
 1515 }
 1516 
 1517 static int
 1518 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
 1519 {
 1520         struct ifbrparam *param = arg;
 1521 
 1522         param->ifbrp_cexceeded = sc->sc_brtexceeded;
 1523         return (0);
 1524 }
 1525 
 1526 static int
 1527 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
 1528 {
 1529         struct ifbpstpconf *bifstp = arg;
 1530         struct bridge_iflist *bif;
 1531         struct bstp_port *bp;
 1532         struct ifbpstpreq bpreq;
 1533         char *buf, *outbuf;
 1534         int count, buflen, len, error = 0;
 1535 
 1536         count = 0;
 1537         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 1538                 if ((bif->bif_flags & IFBIF_STP) != 0)
 1539                         count++;
 1540         }
 1541 
 1542         buflen = sizeof(bpreq) * count;
 1543         if (bifstp->ifbpstp_len == 0) {
 1544                 bifstp->ifbpstp_len = buflen;
 1545                 return (0);
 1546         }
 1547 
 1548         BRIDGE_UNLOCK(sc);
 1549         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
 1550         BRIDGE_LOCK(sc);
 1551 
 1552         count = 0;
 1553         buf = outbuf;
 1554         len = min(bifstp->ifbpstp_len, buflen);
 1555         bzero(&bpreq, sizeof(bpreq));
 1556         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 1557                 if (len < sizeof(bpreq))
 1558                         break;
 1559 
 1560                 if ((bif->bif_flags & IFBIF_STP) == 0)
 1561                         continue;
 1562 
 1563                 bp = &bif->bif_stp;
 1564                 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
 1565                 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
 1566                 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
 1567                 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
 1568                 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
 1569                 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
 1570 
 1571                 memcpy(buf, &bpreq, sizeof(bpreq));
 1572                 count++;
 1573                 buf += sizeof(bpreq);
 1574                 len -= sizeof(bpreq);
 1575         }
 1576 
 1577         BRIDGE_UNLOCK(sc);
 1578         bifstp->ifbpstp_len = sizeof(bpreq) * count;
 1579         error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
 1580         BRIDGE_LOCK(sc);
 1581         free(outbuf, M_TEMP);
 1582         return (error);
 1583 }
 1584 
 1585 static int
 1586 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
 1587 {
 1588         struct ifbrparam *param = arg;
 1589 
 1590         return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
 1591 }
 1592 
 1593 static int
 1594 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
 1595 {
 1596         struct ifbrparam *param = arg;
 1597 
 1598         return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
 1599 }
 1600 
 1601 /*
 1602  * bridge_ifdetach:
 1603  *
 1604  *      Detach an interface from a bridge.  Called when a member
 1605  *      interface is detaching.
 1606  */
 1607 static void
 1608 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
 1609 {
 1610         struct bridge_softc *sc = ifp->if_bridge;
 1611         struct bridge_iflist *bif;
 1612 
 1613         /* Check if the interface is a bridge member */
 1614         if (sc != NULL) {
 1615                 BRIDGE_LOCK(sc);
 1616 
 1617                 bif = bridge_lookup_member_if(sc, ifp);
 1618                 if (bif != NULL)
 1619                         bridge_delete_member(sc, bif, 1);
 1620 
 1621                 BRIDGE_UNLOCK(sc);
 1622                 return;
 1623         }
 1624 
 1625         /* Check if the interface is a span port */
 1626         mtx_lock(&bridge_list_mtx);
 1627         LIST_FOREACH(sc, &bridge_list, sc_list) {
 1628                 BRIDGE_LOCK(sc);
 1629                 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
 1630                         if (ifp == bif->bif_ifp) {
 1631                                 bridge_delete_span(sc, bif);
 1632                                 break;
 1633                         }
 1634 
 1635                 BRIDGE_UNLOCK(sc);
 1636         }
 1637         mtx_unlock(&bridge_list_mtx);
 1638 }
 1639 
 1640 /*
 1641  * bridge_init:
 1642  *
 1643  *      Initialize a bridge interface.
 1644  */
 1645 static void
 1646 bridge_init(void *xsc)
 1647 {
 1648         struct bridge_softc *sc = (struct bridge_softc *)xsc;
 1649         struct ifnet *ifp = sc->sc_ifp;
 1650 
 1651         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
 1652                 return;
 1653 
 1654         BRIDGE_LOCK(sc);
 1655         callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
 1656             bridge_timer, sc);
 1657 
 1658         ifp->if_drv_flags |= IFF_DRV_RUNNING;
 1659         bstp_init(&sc->sc_stp);         /* Initialize Spanning Tree */
 1660 
 1661         BRIDGE_UNLOCK(sc);
 1662 }
 1663 
 1664 /*
 1665  * bridge_stop:
 1666  *
 1667  *      Stop the bridge interface.
 1668  */
 1669 static void
 1670 bridge_stop(struct ifnet *ifp, int disable)
 1671 {
 1672         struct bridge_softc *sc = ifp->if_softc;
 1673 
 1674         BRIDGE_LOCK_ASSERT(sc);
 1675 
 1676         if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
 1677                 return;
 1678 
 1679         callout_stop(&sc->sc_brcallout);
 1680         bstp_stop(&sc->sc_stp);
 1681 
 1682         bridge_rtflush(sc, IFBF_FLUSHDYN);
 1683 
 1684         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
 1685 }
 1686 
 1687 /*
 1688  * bridge_enqueue:
 1689  *
 1690  *      Enqueue a packet on a bridge member interface.
 1691  *
 1692  */
 1693 static void
 1694 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
 1695 {
 1696         int len, err = 0;
 1697         short mflags;
 1698         struct mbuf *m0;
 1699 
 1700         len = m->m_pkthdr.len;
 1701         mflags = m->m_flags;
 1702 
 1703         /* We may be sending a fragment so traverse the mbuf */
 1704         for (; m; m = m0) {
 1705                 m0 = m->m_nextpkt;
 1706                 m->m_nextpkt = NULL;
 1707 
 1708                 /*
 1709                  * If underlying interface can not do VLAN tag insertion itself
 1710                  * then attach a packet tag that holds it.
 1711                  */
 1712                 if ((m->m_flags & M_VLANTAG) &&
 1713                     (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
 1714                         m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
 1715                         if (m == NULL) {
 1716                                 if_printf(dst_ifp,
 1717                                     "unable to prepend VLAN header\n");
 1718                                 dst_ifp->if_oerrors++;
 1719                                 continue;
 1720                         }
 1721                         m->m_flags &= ~M_VLANTAG;
 1722                 }
 1723 
 1724                 if (err == 0)
 1725                         IFQ_ENQUEUE(&dst_ifp->if_snd, m, err);
 1726         }
 1727 
 1728         if (err == 0) {
 1729 
 1730                 sc->sc_ifp->if_opackets++;
 1731                 sc->sc_ifp->if_obytes += len;
 1732 
 1733                 dst_ifp->if_obytes += len;
 1734 
 1735                 if (mflags & M_MCAST) {
 1736                         sc->sc_ifp->if_omcasts++;
 1737                         dst_ifp->if_omcasts++;
 1738                 }
 1739         }
 1740 
 1741         if ((dst_ifp->if_drv_flags & IFF_DRV_OACTIVE) == 0)
 1742                 (*dst_ifp->if_start)(dst_ifp);
 1743 }
 1744 
 1745 /*
 1746  * bridge_dummynet:
 1747  *
 1748  *      Receive a queued packet from dummynet and pass it on to the output
 1749  *      interface.
 1750  *
 1751  *      The mbuf has the Ethernet header already attached.
 1752  */
 1753 static void
 1754 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
 1755 {
 1756         struct bridge_softc *sc;
 1757 
 1758         sc = ifp->if_bridge;
 1759 
 1760         /*
 1761          * The packet didnt originate from a member interface. This should only
 1762          * ever happen if a member interface is removed while packets are
 1763          * queued for it.
 1764          */
 1765         if (sc == NULL) {
 1766                 m_freem(m);
 1767                 return;
 1768         }
 1769 
 1770         if (PFIL_HOOKED(&inet_pfil_hook)
 1771 #ifdef INET6
 1772             || PFIL_HOOKED(&inet6_pfil_hook)
 1773 #endif
 1774             ) {
 1775                 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
 1776                         return;
 1777                 if (m == NULL)
 1778                         return;
 1779         }
 1780 
 1781         bridge_enqueue(sc, ifp, m);
 1782 }
 1783 
 1784 /*
 1785  * bridge_output:
 1786  *
 1787  *      Send output from a bridge member interface.  This
 1788  *      performs the bridging function for locally originated
 1789  *      packets.
 1790  *
 1791  *      The mbuf has the Ethernet header already attached.  We must
 1792  *      enqueue or free the mbuf before returning.
 1793  */
 1794 static int
 1795 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
 1796     struct rtentry *rt)
 1797 {
 1798         struct ether_header *eh;
 1799         struct ifnet *dst_if;
 1800         struct bridge_softc *sc;
 1801         uint16_t vlan;
 1802 
 1803         if (m->m_len < ETHER_HDR_LEN) {
 1804                 m = m_pullup(m, ETHER_HDR_LEN);
 1805                 if (m == NULL)
 1806                         return (0);
 1807         }
 1808 
 1809         eh = mtod(m, struct ether_header *);
 1810         sc = ifp->if_bridge;
 1811         vlan = VLANTAGOF(m);
 1812 
 1813         BRIDGE_LOCK(sc);
 1814 
 1815         /*
 1816          * If bridge is down, but the original output interface is up,
 1817          * go ahead and send out that interface.  Otherwise, the packet
 1818          * is dropped below.
 1819          */
 1820         if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
 1821                 dst_if = ifp;
 1822                 goto sendunicast;
 1823         }
 1824 
 1825         /*
 1826          * If the packet is a multicast, or we don't know a better way to
 1827          * get there, send to all interfaces.
 1828          */
 1829         if (ETHER_IS_MULTICAST(eh->ether_dhost))
 1830                 dst_if = NULL;
 1831         else
 1832                 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
 1833         if (dst_if == NULL) {
 1834                 struct bridge_iflist *bif;
 1835                 struct mbuf *mc;
 1836                 int error = 0, used = 0;
 1837 
 1838                 bridge_span(sc, m);
 1839 
 1840                 BRIDGE_LOCK2REF(sc, error);
 1841                 if (error) {
 1842                         m_freem(m);
 1843                         return (0);
 1844                 }
 1845 
 1846                 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 1847                         dst_if = bif->bif_ifp;
 1848 
 1849                         if (dst_if->if_type == IFT_GIF)
 1850                                 continue;
 1851                         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
 1852                                 continue;
 1853 
 1854                         /*
 1855                          * If this is not the original output interface,
 1856                          * and the interface is participating in spanning
 1857                          * tree, make sure the port is in a state that
 1858                          * allows forwarding.
 1859                          */
 1860                         if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
 1861                             bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
 1862                                 continue;
 1863 
 1864                         if (LIST_NEXT(bif, bif_next) == NULL) {
 1865                                 used = 1;
 1866                                 mc = m;
 1867                         } else {
 1868                                 mc = m_copypacket(m, M_DONTWAIT);
 1869                                 if (mc == NULL) {
 1870                                         sc->sc_ifp->if_oerrors++;
 1871                                         continue;
 1872                                 }
 1873                         }
 1874 
 1875                         bridge_enqueue(sc, dst_if, mc);
 1876                 }
 1877                 if (used == 0)
 1878                         m_freem(m);
 1879                 BRIDGE_UNREF(sc);
 1880                 return (0);
 1881         }
 1882 
 1883 sendunicast:
 1884         /*
 1885          * XXX Spanning tree consideration here?
 1886          */
 1887 
 1888         bridge_span(sc, m);
 1889         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
 1890                 m_freem(m);
 1891                 BRIDGE_UNLOCK(sc);
 1892                 return (0);
 1893         }
 1894 
 1895         BRIDGE_UNLOCK(sc);
 1896         bridge_enqueue(sc, dst_if, m);
 1897         return (0);
 1898 }
 1899 
 1900 /*
 1901  * bridge_start:
 1902  *
 1903  *      Start output on a bridge.
 1904  *
 1905  */
 1906 static void
 1907 bridge_start(struct ifnet *ifp)
 1908 {
 1909         struct bridge_softc *sc;
 1910         struct mbuf *m;
 1911         struct ether_header *eh;
 1912         struct ifnet *dst_if;
 1913 
 1914         sc = ifp->if_softc;
 1915 
 1916         ifp->if_drv_flags |= IFF_DRV_OACTIVE;
 1917         for (;;) {
 1918                 IFQ_DEQUEUE(&ifp->if_snd, m);
 1919                 if (m == 0)
 1920                         break;
 1921                 ETHER_BPF_MTAP(ifp, m);
 1922 
 1923                 eh = mtod(m, struct ether_header *);
 1924                 dst_if = NULL;
 1925 
 1926                 BRIDGE_LOCK(sc);
 1927                 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
 1928                         dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1);
 1929                 }
 1930 
 1931                 if (dst_if == NULL)
 1932                         bridge_broadcast(sc, ifp, m, 0);
 1933                 else {
 1934                         BRIDGE_UNLOCK(sc);
 1935                         bridge_enqueue(sc, dst_if, m);
 1936                 }
 1937         }
 1938         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
 1939 }
 1940 
 1941 /*
 1942  * bridge_forward:
 1943  *
 1944  *      The forwarding function of the bridge.
 1945  *
 1946  *      NOTE: Releases the lock on return.
 1947  */
 1948 static void
 1949 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
 1950     struct mbuf *m)
 1951 {
 1952         struct bridge_iflist *dbif;
 1953         struct ifnet *src_if, *dst_if, *ifp;
 1954         struct ether_header *eh;
 1955         uint16_t vlan;
 1956         uint8_t *dst;
 1957         int error;
 1958 
 1959         src_if = m->m_pkthdr.rcvif;
 1960         ifp = sc->sc_ifp;
 1961 
 1962         ifp->if_ipackets++;
 1963         ifp->if_ibytes += m->m_pkthdr.len;
 1964         vlan = VLANTAGOF(m);
 1965 
 1966         if ((sbif->bif_flags & IFBIF_STP) &&
 1967             sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
 1968                 goto drop;
 1969 
 1970         eh = mtod(m, struct ether_header *);
 1971         dst = eh->ether_dhost;
 1972 
 1973         /* If the interface is learning, record the address. */
 1974         if (sbif->bif_flags & IFBIF_LEARNING) {
 1975                 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
 1976                     sbif, 0, IFBAF_DYNAMIC);
 1977                 /*
 1978                  * If the interface has addresses limits then deny any source
 1979                  * that is not in the cache.
 1980                  */
 1981                 if (error && sbif->bif_addrmax)
 1982                         goto drop;
 1983         }
 1984 
 1985         if ((sbif->bif_flags & IFBIF_STP) != 0 &&
 1986             sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
 1987                 goto drop;
 1988 
 1989         /*
 1990          * At this point, the port either doesn't participate
 1991          * in spanning tree or it is in the forwarding state.
 1992          */
 1993 
 1994         /*
 1995          * If the packet is unicast, destined for someone on
 1996          * "this" side of the bridge, drop it.
 1997          */
 1998         if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
 1999                 dst_if = bridge_rtlookup(sc, dst, vlan);
 2000                 if (src_if == dst_if)
 2001                         goto drop;
 2002         } else {
 2003                 /*
 2004                  * Check if its a reserved multicast address, any address
 2005                  * listed in 802.1D section 7.12.6 may not be forwarded by the
 2006                  * bridge.
 2007                  * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
 2008                  */
 2009                 if (dst[0] == 0x01 && dst[1] == 0x80 &&
 2010                     dst[2] == 0xc2 && dst[3] == 0x00 &&
 2011                     dst[4] == 0x00 && dst[5] <= 0x0f)
 2012                         goto drop;
 2013 
 2014                 /* ...forward it to all interfaces. */
 2015                 ifp->if_imcasts++;
 2016                 dst_if = NULL;
 2017         }
 2018 
 2019         /*
 2020          * If we have a destination interface which is a member of our bridge,
 2021          * OR this is a unicast packet, push it through the bpf(4) machinery.
 2022          * For broadcast or multicast packets, don't bother because it will
 2023          * be reinjected into ether_input. We do this before we pass the packets
 2024          * through the pfil(9) framework, as it is possible that pfil(9) will
 2025          * drop the packet, or possibly modify it, making it difficult to debug
 2026          * firewall issues on the bridge.
 2027          */
 2028         if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
 2029                 ETHER_BPF_MTAP(ifp, m);
 2030 
 2031         /* run the packet filter */
 2032         if (PFIL_HOOKED(&inet_pfil_hook)
 2033 #ifdef INET6
 2034             || PFIL_HOOKED(&inet6_pfil_hook)
 2035 #endif
 2036             ) {
 2037                 BRIDGE_UNLOCK(sc);
 2038                 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
 2039                         return;
 2040                 if (m == NULL)
 2041                         return;
 2042                 BRIDGE_LOCK(sc);
 2043         }
 2044 
 2045         if (dst_if == NULL) {
 2046                 bridge_broadcast(sc, src_if, m, 1);
 2047                 return;
 2048         }
 2049 
 2050         /*
 2051          * At this point, we're dealing with a unicast frame
 2052          * going to a different interface.
 2053          */
 2054         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
 2055                 goto drop;
 2056 
 2057         dbif = bridge_lookup_member_if(sc, dst_if);
 2058         if (dbif == NULL)
 2059                 /* Not a member of the bridge (anymore?) */
 2060                 goto drop;
 2061 
 2062         /* Private segments can not talk to each other */
 2063         if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
 2064                 goto drop;
 2065 
 2066         if ((dbif->bif_flags & IFBIF_STP) &&
 2067             dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
 2068                 goto drop;
 2069 
 2070         BRIDGE_UNLOCK(sc);
 2071 
 2072         if (PFIL_HOOKED(&inet_pfil_hook)
 2073 #ifdef INET6
 2074             || PFIL_HOOKED(&inet6_pfil_hook)
 2075 #endif
 2076             ) {
 2077                 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
 2078                         return;
 2079                 if (m == NULL)
 2080                         return;
 2081         }
 2082 
 2083         bridge_enqueue(sc, dst_if, m);
 2084         return;
 2085 
 2086 drop:
 2087         BRIDGE_UNLOCK(sc);
 2088         m_freem(m);
 2089 }
 2090 
 2091 /*
 2092  * bridge_input:
 2093  *
 2094  *      Receive input from a member interface.  Queue the packet for
 2095  *      bridging if it is not for us.
 2096  */
 2097 static struct mbuf *
 2098 bridge_input(struct ifnet *ifp, struct mbuf *m)
 2099 {
 2100         struct bridge_softc *sc = ifp->if_bridge;
 2101         struct bridge_iflist *bif, *bif2;
 2102         struct ifnet *bifp;
 2103         struct ether_header *eh;
 2104         struct mbuf *mc, *mc2;
 2105         uint16_t vlan;
 2106         int error;
 2107 
 2108         if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
 2109                 return (m);
 2110 
 2111         bifp = sc->sc_ifp;
 2112         vlan = VLANTAGOF(m);
 2113 
 2114         /*
 2115          * Implement support for bridge monitoring. If this flag has been
 2116          * set on this interface, discard the packet once we push it through
 2117          * the bpf(4) machinery, but before we do, increment the byte and
 2118          * packet counters associated with this interface.
 2119          */
 2120         if ((bifp->if_flags & IFF_MONITOR) != 0) {
 2121                 m->m_pkthdr.rcvif  = bifp;
 2122                 ETHER_BPF_MTAP(bifp, m);
 2123                 bifp->if_ipackets++;
 2124                 bifp->if_ibytes += m->m_pkthdr.len;
 2125                 m_freem(m);
 2126                 return (NULL);
 2127         }
 2128         BRIDGE_LOCK(sc);
 2129         bif = bridge_lookup_member_if(sc, ifp);
 2130         if (bif == NULL) {
 2131                 BRIDGE_UNLOCK(sc);
 2132                 return (m);
 2133         }
 2134 
 2135         eh = mtod(m, struct ether_header *);
 2136 
 2137         bridge_span(sc, m);
 2138 
 2139         if (m->m_flags & (M_BCAST|M_MCAST)) {
 2140                 /* Tap off 802.1D packets; they do not get forwarded. */
 2141                 if (memcmp(eh->ether_dhost, bstp_etheraddr,
 2142                     ETHER_ADDR_LEN) == 0) {
 2143                         m = bstp_input(&bif->bif_stp, ifp, m);
 2144                         if (m == NULL) {
 2145                                 BRIDGE_UNLOCK(sc);
 2146                                 return (NULL);
 2147                         }
 2148                 }
 2149 
 2150                 if ((bif->bif_flags & IFBIF_STP) &&
 2151                     bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
 2152                         BRIDGE_UNLOCK(sc);
 2153                         return (m);
 2154                 }
 2155 
 2156                 /*
 2157                  * Make a deep copy of the packet and enqueue the copy
 2158                  * for bridge processing; return the original packet for
 2159                  * local processing.
 2160                  */
 2161                 mc = m_dup(m, M_DONTWAIT);
 2162                 if (mc == NULL) {
 2163                         BRIDGE_UNLOCK(sc);
 2164                         return (m);
 2165                 }
 2166 
 2167                 /* Perform the bridge forwarding function with the copy. */
 2168                 bridge_forward(sc, bif, mc);
 2169 
 2170                 /*
 2171                  * Reinject the mbuf as arriving on the bridge so we have a
 2172                  * chance at claiming multicast packets. We can not loop back
 2173                  * here from ether_input as a bridge is never a member of a
 2174                  * bridge.
 2175                  */
 2176                 KASSERT(bifp->if_bridge == NULL,
 2177                     ("loop created in bridge_input"));
 2178                 mc2 = m_dup(m, M_DONTWAIT);
 2179                 if (mc2 != NULL) {
 2180                         /* Keep the layer3 header aligned */
 2181                         int i = min(mc2->m_pkthdr.len, max_protohdr);
 2182                         mc2 = m_copyup(mc2, i, ETHER_ALIGN);
 2183                 }
 2184                 if (mc2 != NULL) {
 2185                         mc2->m_pkthdr.rcvif = bifp;
 2186                         (*bifp->if_input)(bifp, mc2);
 2187                 }
 2188 
 2189                 /* Return the original packet for local processing. */
 2190                 return (m);
 2191         }
 2192 
 2193         if ((bif->bif_flags & IFBIF_STP) &&
 2194             bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
 2195                 BRIDGE_UNLOCK(sc);
 2196                 return (m);
 2197         }
 2198 
 2199 #ifdef DEV_CARP
 2200 #   define OR_CARP_CHECK_WE_ARE_DST(iface) \
 2201         || ((iface)->if_carp \
 2202             && carp_forus((iface)->if_carp, eh->ether_dhost))
 2203 #   define OR_CARP_CHECK_WE_ARE_SRC(iface) \
 2204         || ((iface)->if_carp \
 2205             && carp_forus((iface)->if_carp, eh->ether_shost))
 2206 #else
 2207 #   define OR_CARP_CHECK_WE_ARE_DST(iface)
 2208 #   define OR_CARP_CHECK_WE_ARE_SRC(iface)
 2209 #endif
 2210 
 2211 #ifdef INET6
 2212 #   define OR_PFIL_HOOKED_INET6 \
 2213         || PFIL_HOOKED(&inet6_pfil_hook)
 2214 #else
 2215 #   define OR_PFIL_HOOKED_INET6
 2216 #endif
 2217 
 2218 #define GRAB_OUR_PACKETS(iface) \
 2219         if ((iface)->if_type == IFT_GIF) \
 2220                 continue; \
 2221         /* It is destined for us. */ \
 2222         if (memcmp(IF_LLADDR((iface)), eh->ether_dhost,  ETHER_ADDR_LEN) == 0 \
 2223             OR_CARP_CHECK_WE_ARE_DST((iface))                           \
 2224             ) {                                                         \
 2225                 if ((iface)->if_type == IFT_BRIDGE) {                   \
 2226                         ETHER_BPF_MTAP(iface, m);                       \
 2227                         iface->if_ipackets++;                           \
 2228                         /* Filter on the physical interface. */         \
 2229                         if (pfil_local_phys &&                          \
 2230                             (PFIL_HOOKED(&inet_pfil_hook)               \
 2231                              OR_PFIL_HOOKED_INET6)) {                   \
 2232                                 if (bridge_pfil(&m, NULL, ifp,          \
 2233                                     PFIL_IN) != 0 || m == NULL) {       \
 2234                                         BRIDGE_UNLOCK(sc);              \
 2235                                         return (NULL);                  \
 2236                                 }                                       \
 2237                         }                                               \
 2238                 }                                                       \
 2239                 if (bif->bif_flags & IFBIF_LEARNING) {                  \
 2240                         error = bridge_rtupdate(sc, eh->ether_shost,    \
 2241                             vlan, bif, 0, IFBAF_DYNAMIC);               \
 2242                         if (error && bif->bif_addrmax) {                \
 2243                                 BRIDGE_UNLOCK(sc);                      \
 2244                                 m_freem(m);                             \
 2245                                 return (NULL);                          \
 2246                         }                                               \
 2247                 }                                                       \
 2248                 m->m_pkthdr.rcvif = iface;                              \
 2249                 BRIDGE_UNLOCK(sc);                                      \
 2250                 return (m);                                             \
 2251         }                                                               \
 2252                                                                         \
 2253         /* We just received a packet that we sent out. */               \
 2254         if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
 2255             OR_CARP_CHECK_WE_ARE_SRC((iface))                   \
 2256             ) {                                                         \
 2257                 BRIDGE_UNLOCK(sc);                                      \
 2258                 m_freem(m);                                             \
 2259                 return (NULL);                                          \
 2260         }
 2261 
 2262         /*
 2263          * Unicast.  Make sure it's not for the bridge.
 2264          */
 2265         do { GRAB_OUR_PACKETS(bifp) } while (0);
 2266 
 2267         /*
 2268          * Give a chance for ifp at first priority. This will help when the
 2269          * packet comes through the interface like VLAN's with the same MACs
 2270          * on several interfaces from the same bridge. This also will save
 2271          * some CPU cycles in case the destination interface and the input
 2272          * interface (eq ifp) are the same.
 2273          */
 2274         do { GRAB_OUR_PACKETS(ifp) } while (0);
 2275 
 2276         /* Now check the all bridge members. */
 2277         LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
 2278                 GRAB_OUR_PACKETS(bif2->bif_ifp)
 2279         }
 2280 
 2281 #undef OR_CARP_CHECK_WE_ARE_DST
 2282 #undef OR_CARP_CHECK_WE_ARE_SRC
 2283 #undef OR_PFIL_HOOKED_INET6
 2284 #undef GRAB_OUR_PACKETS
 2285 
 2286         /* Perform the bridge forwarding function. */
 2287         bridge_forward(sc, bif, m);
 2288 
 2289         return (NULL);
 2290 }
 2291 
 2292 /*
 2293  * bridge_broadcast:
 2294  *
 2295  *      Send a frame to all interfaces that are members of
 2296  *      the bridge, except for the one on which the packet
 2297  *      arrived.
 2298  *
 2299  *      NOTE: Releases the lock on return.
 2300  */
 2301 static void
 2302 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
 2303     struct mbuf *m, int runfilt)
 2304 {
 2305         struct bridge_iflist *dbif, *sbif;
 2306         struct mbuf *mc;
 2307         struct ifnet *dst_if;
 2308         int error = 0, used = 0, i;
 2309 
 2310         sbif = bridge_lookup_member_if(sc, src_if);
 2311 
 2312         BRIDGE_LOCK2REF(sc, error);
 2313         if (error) {
 2314                 m_freem(m);
 2315                 return;
 2316         }
 2317 
 2318         /* Filter on the bridge interface before broadcasting */
 2319         if (runfilt && (PFIL_HOOKED(&inet_pfil_hook)
 2320 #ifdef INET6
 2321             || PFIL_HOOKED(&inet6_pfil_hook)
 2322 #endif
 2323             )) {
 2324                 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
 2325                         goto out;
 2326                 if (m == NULL)
 2327                         goto out;
 2328         }
 2329 
 2330         LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
 2331                 dst_if = dbif->bif_ifp;
 2332                 if (dst_if == src_if)
 2333                         continue;
 2334 
 2335                 /* Private segments can not talk to each other */
 2336                 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
 2337                         continue;
 2338 
 2339                 if ((dbif->bif_flags & IFBIF_STP) &&
 2340                     dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
 2341                         continue;
 2342 
 2343                 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
 2344                     (m->m_flags & (M_BCAST|M_MCAST)) == 0)
 2345                         continue;
 2346 
 2347                 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
 2348                         continue;
 2349 
 2350                 if (LIST_NEXT(dbif, bif_next) == NULL) {
 2351                         mc = m;
 2352                         used = 1;
 2353                 } else {
 2354                         mc = m_dup(m, M_DONTWAIT);
 2355                         if (mc == NULL) {
 2356                                 sc->sc_ifp->if_oerrors++;
 2357                                 continue;
 2358                         }
 2359                 }
 2360 
 2361                 /*
 2362                  * Filter on the output interface. Pass a NULL bridge interface
 2363                  * pointer so we do not redundantly filter on the bridge for
 2364                  * each interface we broadcast on.
 2365                  */
 2366                 if (runfilt && (PFIL_HOOKED(&inet_pfil_hook)
 2367 #ifdef INET6
 2368                     || PFIL_HOOKED(&inet6_pfil_hook)
 2369 #endif
 2370                     )) {
 2371                         if (used == 0) {
 2372                                 /* Keep the layer3 header aligned */
 2373                                 i = min(mc->m_pkthdr.len, max_protohdr);
 2374                                 mc = m_copyup(mc, i, ETHER_ALIGN);
 2375                                 if (mc == NULL) {
 2376                                         sc->sc_ifp->if_oerrors++;
 2377                                         continue;
 2378                                 }
 2379                         }
 2380                         if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
 2381                                 continue;
 2382                         if (mc == NULL)
 2383                                 continue;
 2384                 }
 2385 
 2386                 bridge_enqueue(sc, dst_if, mc);
 2387         }
 2388         if (used == 0)
 2389                 m_freem(m);
 2390 
 2391 out:
 2392         BRIDGE_UNREF(sc);
 2393 }
 2394 
 2395 /*
 2396  * bridge_span:
 2397  *
 2398  *      Duplicate a packet out one or more interfaces that are in span mode,
 2399  *      the original mbuf is unmodified.
 2400  */
 2401 static void
 2402 bridge_span(struct bridge_softc *sc, struct mbuf *m)
 2403 {
 2404         struct bridge_iflist *bif;
 2405         struct ifnet *dst_if;
 2406         struct mbuf *mc;
 2407 
 2408         if (LIST_EMPTY(&sc->sc_spanlist))
 2409                 return;
 2410 
 2411         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
 2412                 dst_if = bif->bif_ifp;
 2413 
 2414                 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
 2415                         continue;
 2416 
 2417                 mc = m_copypacket(m, M_DONTWAIT);
 2418                 if (mc == NULL) {
 2419                         sc->sc_ifp->if_oerrors++;
 2420                         continue;
 2421                 }
 2422 
 2423                 bridge_enqueue(sc, dst_if, mc);
 2424         }
 2425 }
 2426 
 2427 /*
 2428  * bridge_rtupdate:
 2429  *
 2430  *      Add a bridge routing entry.
 2431  */
 2432 static int
 2433 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
 2434     struct bridge_iflist *bif, int setflags, uint8_t flags)
 2435 {
 2436         struct bridge_rtnode *brt;
 2437         int error;
 2438 
 2439         BRIDGE_LOCK_ASSERT(sc);
 2440 
 2441         /* Check the source address is valid and not multicast. */
 2442         if (ETHER_IS_MULTICAST(dst) ||
 2443             (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
 2444              dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
 2445                 return (EINVAL);
 2446 
 2447         /* 802.1p frames map to vlan 1 */
 2448         if (vlan == 0)
 2449                 vlan = 1;
 2450 
 2451         /*
 2452          * A route for this destination might already exist.  If so,
 2453          * update it, otherwise create a new one.
 2454          */
 2455         if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
 2456                 if (sc->sc_brtcnt >= sc->sc_brtmax) {
 2457                         sc->sc_brtexceeded++;
 2458                         return (ENOSPC);
 2459                 }
 2460                 /* Check per interface address limits (if enabled) */
 2461                 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
 2462                         bif->bif_addrexceeded++;
 2463                         return (ENOSPC);
 2464                 }
 2465 
 2466                 /*
 2467                  * Allocate a new bridge forwarding node, and
 2468                  * initialize the expiration time and Ethernet
 2469                  * address.
 2470                  */
 2471                 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO);
 2472                 if (brt == NULL)
 2473                         return (ENOMEM);
 2474 
 2475                 if (bif->bif_flags & IFBIF_STICKY)
 2476                         brt->brt_flags = IFBAF_STICKY;
 2477                 else
 2478                         brt->brt_flags = IFBAF_DYNAMIC;
 2479 
 2480                 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
 2481                 brt->brt_vlan = vlan;
 2482 
 2483                 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
 2484                         uma_zfree(bridge_rtnode_zone, brt);
 2485                         return (error);
 2486                 }
 2487                 brt->brt_dst = bif;
 2488                 bif->bif_addrcnt++;
 2489         }
 2490 
 2491         if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
 2492             brt->brt_dst != bif) {
 2493                 brt->brt_dst->bif_addrcnt--;
 2494                 brt->brt_dst = bif;
 2495                 brt->brt_dst->bif_addrcnt++;
 2496         }
 2497 
 2498         if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
 2499                 brt->brt_expire = time_uptime + sc->sc_brttimeout;
 2500         if (setflags)
 2501                 brt->brt_flags = flags;
 2502 
 2503         return (0);
 2504 }
 2505 
 2506 /*
 2507  * bridge_rtlookup:
 2508  *
 2509  *      Lookup the destination interface for an address.
 2510  */
 2511 static struct ifnet *
 2512 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
 2513 {
 2514         struct bridge_rtnode *brt;
 2515 
 2516         BRIDGE_LOCK_ASSERT(sc);
 2517 
 2518         if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
 2519                 return (NULL);
 2520 
 2521         return (brt->brt_ifp);
 2522 }
 2523 
 2524 /*
 2525  * bridge_rttrim:
 2526  *
 2527  *      Trim the routine table so that we have a number
 2528  *      of routing entries less than or equal to the
 2529  *      maximum number.
 2530  */
 2531 static void
 2532 bridge_rttrim(struct bridge_softc *sc)
 2533 {
 2534         struct bridge_rtnode *brt, *nbrt;
 2535 
 2536         BRIDGE_LOCK_ASSERT(sc);
 2537 
 2538         /* Make sure we actually need to do this. */
 2539         if (sc->sc_brtcnt <= sc->sc_brtmax)
 2540                 return;
 2541 
 2542         /* Force an aging cycle; this might trim enough addresses. */
 2543         bridge_rtage(sc);
 2544         if (sc->sc_brtcnt <= sc->sc_brtmax)
 2545                 return;
 2546 
 2547         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
 2548                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
 2549                         bridge_rtnode_destroy(sc, brt);
 2550                         if (sc->sc_brtcnt <= sc->sc_brtmax)
 2551                                 return;
 2552                 }
 2553         }
 2554 }
 2555 
 2556 /*
 2557  * bridge_timer:
 2558  *
 2559  *      Aging timer for the bridge.
 2560  */
 2561 static void
 2562 bridge_timer(void *arg)
 2563 {
 2564         struct bridge_softc *sc = arg;
 2565 
 2566         BRIDGE_LOCK_ASSERT(sc);
 2567 
 2568         bridge_rtage(sc);
 2569 
 2570         if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
 2571                 callout_reset(&sc->sc_brcallout,
 2572                     bridge_rtable_prune_period * hz, bridge_timer, sc);
 2573 }
 2574 
 2575 /*
 2576  * bridge_rtage:
 2577  *
 2578  *      Perform an aging cycle.
 2579  */
 2580 static void
 2581 bridge_rtage(struct bridge_softc *sc)
 2582 {
 2583         struct bridge_rtnode *brt, *nbrt;
 2584 
 2585         BRIDGE_LOCK_ASSERT(sc);
 2586 
 2587         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
 2588                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
 2589                         if (time_uptime >= brt->brt_expire)
 2590                                 bridge_rtnode_destroy(sc, brt);
 2591                 }
 2592         }
 2593 }
 2594 
 2595 /*
 2596  * bridge_rtflush:
 2597  *
 2598  *      Remove all dynamic addresses from the bridge.
 2599  */
 2600 static void
 2601 bridge_rtflush(struct bridge_softc *sc, int full)
 2602 {
 2603         struct bridge_rtnode *brt, *nbrt;
 2604 
 2605         BRIDGE_LOCK_ASSERT(sc);
 2606 
 2607         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
 2608                 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
 2609                         bridge_rtnode_destroy(sc, brt);
 2610         }
 2611 }
 2612 
 2613 /*
 2614  * bridge_rtdaddr:
 2615  *
 2616  *      Remove an address from the table.
 2617  */
 2618 static int
 2619 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
 2620 {
 2621         struct bridge_rtnode *brt;
 2622         int found = 0;
 2623 
 2624         BRIDGE_LOCK_ASSERT(sc);
 2625 
 2626         /*
 2627          * If vlan is zero then we want to delete for all vlans so the lookup
 2628          * may return more than one.
 2629          */
 2630         while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
 2631                 bridge_rtnode_destroy(sc, brt);
 2632                 found = 1;
 2633         }
 2634 
 2635         return (found ? 0 : ENOENT);
 2636 }
 2637 
 2638 /*
 2639  * bridge_rtdelete:
 2640  *
 2641  *      Delete routes to a speicifc member interface.
 2642  */
 2643 static void
 2644 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
 2645 {
 2646         struct bridge_rtnode *brt, *nbrt;
 2647 
 2648         BRIDGE_LOCK_ASSERT(sc);
 2649 
 2650         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
 2651                 if (brt->brt_ifp == ifp && (full ||
 2652                             (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
 2653                         bridge_rtnode_destroy(sc, brt);
 2654         }
 2655 }
 2656 
 2657 /*
 2658  * bridge_rtable_init:
 2659  *
 2660  *      Initialize the route table for this bridge.
 2661  */
 2662 static int
 2663 bridge_rtable_init(struct bridge_softc *sc)
 2664 {
 2665         int i;
 2666 
 2667         sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
 2668             M_DEVBUF, M_NOWAIT);
 2669         if (sc->sc_rthash == NULL)
 2670                 return (ENOMEM);
 2671 
 2672         for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
 2673                 LIST_INIT(&sc->sc_rthash[i]);
 2674 
 2675         sc->sc_rthash_key = arc4random();
 2676 
 2677         LIST_INIT(&sc->sc_rtlist);
 2678 
 2679         return (0);
 2680 }
 2681 
 2682 /*
 2683  * bridge_rtable_fini:
 2684  *
 2685  *      Deconstruct the route table for this bridge.
 2686  */
 2687 static void
 2688 bridge_rtable_fini(struct bridge_softc *sc)
 2689 {
 2690 
 2691         KASSERT(sc->sc_brtcnt == 0,
 2692             ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
 2693         free(sc->sc_rthash, M_DEVBUF);
 2694 }
 2695 
 2696 /*
 2697  * The following hash function is adapted from "Hash Functions" by Bob Jenkins
 2698  * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
 2699  */
 2700 #define mix(a, b, c)                                                    \
 2701 do {                                                                    \
 2702         a -= b; a -= c; a ^= (c >> 13);                                 \
 2703         b -= c; b -= a; b ^= (a << 8);                                  \
 2704         c -= a; c -= b; c ^= (b >> 13);                                 \
 2705         a -= b; a -= c; a ^= (c >> 12);                                 \
 2706         b -= c; b -= a; b ^= (a << 16);                                 \
 2707         c -= a; c -= b; c ^= (b >> 5);                                  \
 2708         a -= b; a -= c; a ^= (c >> 3);                                  \
 2709         b -= c; b -= a; b ^= (a << 10);                                 \
 2710         c -= a; c -= b; c ^= (b >> 15);                                 \
 2711 } while (/*CONSTCOND*/0)
 2712 
 2713 static __inline uint32_t
 2714 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
 2715 {
 2716         uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
 2717 
 2718         b += addr[5] << 8;
 2719         b += addr[4];
 2720         a += addr[3] << 24;
 2721         a += addr[2] << 16;
 2722         a += addr[1] << 8;
 2723         a += addr[0];
 2724 
 2725         mix(a, b, c);
 2726 
 2727         return (c & BRIDGE_RTHASH_MASK);
 2728 }
 2729 
 2730 #undef mix
 2731 
 2732 static int
 2733 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
 2734 {
 2735         int i, d;
 2736 
 2737         for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
 2738                 d = ((int)a[i]) - ((int)b[i]);
 2739         }
 2740 
 2741         return (d);
 2742 }
 2743 
 2744 /*
 2745  * bridge_rtnode_lookup:
 2746  *
 2747  *      Look up a bridge route node for the specified destination. Compare the
 2748  *      vlan id or if zero then just return the first match.
 2749  */
 2750 static struct bridge_rtnode *
 2751 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
 2752 {
 2753         struct bridge_rtnode *brt;
 2754         uint32_t hash;
 2755         int dir;
 2756 
 2757         BRIDGE_LOCK_ASSERT(sc);
 2758 
 2759         hash = bridge_rthash(sc, addr);
 2760         LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
 2761                 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
 2762                 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
 2763                         return (brt);
 2764                 if (dir > 0)
 2765                         return (NULL);
 2766         }
 2767 
 2768         return (NULL);
 2769 }
 2770 
 2771 /*
 2772  * bridge_rtnode_insert:
 2773  *
 2774  *      Insert the specified bridge node into the route table.  We
 2775  *      assume the entry is not already in the table.
 2776  */
 2777 static int
 2778 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
 2779 {
 2780         struct bridge_rtnode *lbrt;
 2781         uint32_t hash;
 2782         int dir;
 2783 
 2784         BRIDGE_LOCK_ASSERT(sc);
 2785 
 2786         hash = bridge_rthash(sc, brt->brt_addr);
 2787 
 2788         lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
 2789         if (lbrt == NULL) {
 2790                 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
 2791                 goto out;
 2792         }
 2793 
 2794         do {
 2795                 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
 2796                 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
 2797                         return (EEXIST);
 2798                 if (dir > 0) {
 2799                         LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
 2800                         goto out;
 2801                 }
 2802                 if (LIST_NEXT(lbrt, brt_hash) == NULL) {
 2803                         LIST_INSERT_AFTER(lbrt, brt, brt_hash);
 2804                         goto out;
 2805                 }
 2806                 lbrt = LIST_NEXT(lbrt, brt_hash);
 2807         } while (lbrt != NULL);
 2808 
 2809 #ifdef DIAGNOSTIC
 2810         panic("bridge_rtnode_insert: impossible");
 2811 #endif
 2812 
 2813 out:
 2814         LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
 2815         sc->sc_brtcnt++;
 2816 
 2817         return (0);
 2818 }
 2819 
 2820 /*
 2821  * bridge_rtnode_destroy:
 2822  *
 2823  *      Destroy a bridge rtnode.
 2824  */
 2825 static void
 2826 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
 2827 {
 2828         BRIDGE_LOCK_ASSERT(sc);
 2829 
 2830         LIST_REMOVE(brt, brt_hash);
 2831 
 2832         LIST_REMOVE(brt, brt_list);
 2833         sc->sc_brtcnt--;
 2834         brt->brt_dst->bif_addrcnt--;
 2835         uma_zfree(bridge_rtnode_zone, brt);
 2836 }
 2837 
 2838 /*
 2839  * bridge_rtable_expire:
 2840  *
 2841  *      Set the expiry time for all routes on an interface.
 2842  */
 2843 static void
 2844 bridge_rtable_expire(struct ifnet *ifp, int age)
 2845 {
 2846         struct bridge_softc *sc = ifp->if_bridge;
 2847         struct bridge_rtnode *brt;
 2848 
 2849         BRIDGE_LOCK(sc);
 2850 
 2851         /*
 2852          * If the age is zero then flush, otherwise set all the expiry times to
 2853          * age for the interface
 2854          */
 2855         if (age == 0)
 2856                 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
 2857         else {
 2858                 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
 2859                         /* Cap the expiry time to 'age' */
 2860                         if (brt->brt_ifp == ifp &&
 2861                             brt->brt_expire > time_uptime + age &&
 2862                             (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
 2863                                 brt->brt_expire = time_uptime + age;
 2864                 }
 2865         }
 2866         BRIDGE_UNLOCK(sc);
 2867 }
 2868 
 2869 /*
 2870  * bridge_state_change:
 2871  *
 2872  *      Callback from the bridgestp code when a port changes states.
 2873  */
 2874 static void
 2875 bridge_state_change(struct ifnet *ifp, int state)
 2876 {
 2877         struct bridge_softc *sc = ifp->if_bridge;
 2878         static const char *stpstates[] = {
 2879                 "disabled",
 2880                 "listening",
 2881                 "learning",
 2882                 "forwarding",
 2883                 "blocking",
 2884                 "discarding"
 2885         };
 2886 
 2887         if (log_stp)
 2888                 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
 2889                     sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
 2890 }
 2891 
 2892 /*
 2893  * Send bridge packets through pfil if they are one of the types pfil can deal
 2894  * with, or if they are ARP or REVARP.  (pfil will pass ARP and REVARP without
 2895  * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
 2896  * that interface.
 2897  */
 2898 static int
 2899 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
 2900 {
 2901         int snap, error, i, hlen;
 2902         struct ether_header *eh1, eh2;
 2903         struct ip_fw_args args;
 2904         struct ip *ip;
 2905         struct llc llc1;
 2906         u_int16_t ether_type;
 2907 
 2908         snap = 0;
 2909         error = -1;     /* Default error if not error == 0 */
 2910 
 2911 #if 0
 2912         /* we may return with the IP fields swapped, ensure its not shared */
 2913         KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
 2914 #endif
 2915 
 2916         if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0)
 2917                 return (0); /* filtering is disabled */
 2918 
 2919         i = min((*mp)->m_pkthdr.len, max_protohdr);
 2920         if ((*mp)->m_len < i) {
 2921             *mp = m_pullup(*mp, i);
 2922             if (*mp == NULL) {
 2923                 printf("%s: m_pullup failed\n", __func__);
 2924                 return (-1);
 2925             }
 2926         }
 2927 
 2928         eh1 = mtod(*mp, struct ether_header *);
 2929         ether_type = ntohs(eh1->ether_type);
 2930 
 2931         /*
 2932          * Check for SNAP/LLC.
 2933          */
 2934         if (ether_type < ETHERMTU) {
 2935                 struct llc *llc2 = (struct llc *)(eh1 + 1);
 2936 
 2937                 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
 2938                     llc2->llc_dsap == LLC_SNAP_LSAP &&
 2939                     llc2->llc_ssap == LLC_SNAP_LSAP &&
 2940                     llc2->llc_control == LLC_UI) {
 2941                         ether_type = htons(llc2->llc_un.type_snap.ether_type);
 2942                         snap = 1;
 2943                 }
 2944         }
 2945 
 2946         /*
 2947          * If we're trying to filter bridge traffic, don't look at anything
 2948          * other than IP and ARP traffic.  If the filter doesn't understand
 2949          * IPv6, don't allow IPv6 through the bridge either.  This is lame
 2950          * since if we really wanted, say, an AppleTalk filter, we are hosed,
 2951          * but of course we don't have an AppleTalk filter to begin with.
 2952          * (Note that since pfil doesn't understand ARP it will pass *ALL*
 2953          * ARP traffic.)
 2954          */
 2955         switch (ether_type) {
 2956                 case ETHERTYPE_ARP:
 2957                 case ETHERTYPE_REVARP:
 2958                         if (pfil_ipfw_arp == 0)
 2959                                 return (0); /* Automatically pass */
 2960                         break;
 2961 
 2962                 case ETHERTYPE_IP:
 2963 #ifdef INET6
 2964                 case ETHERTYPE_IPV6:
 2965 #endif /* INET6 */
 2966                         break;
 2967                 default:
 2968                         /*
 2969                          * Check to see if the user wants to pass non-ip
 2970                          * packets, these will not be checked by pfil(9) and
 2971                          * passed unconditionally so the default is to drop.
 2972                          */
 2973                         if (pfil_onlyip)
 2974                                 goto bad;
 2975         }
 2976 
 2977         /* Strip off the Ethernet header and keep a copy. */
 2978         m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
 2979         m_adj(*mp, ETHER_HDR_LEN);
 2980 
 2981         /* Strip off snap header, if present */
 2982         if (snap) {
 2983                 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
 2984                 m_adj(*mp, sizeof(struct llc));
 2985         }
 2986 
 2987         /*
 2988          * Check the IP header for alignment and errors
 2989          */
 2990         if (dir == PFIL_IN) {
 2991                 switch (ether_type) {
 2992                         case ETHERTYPE_IP:
 2993                                 error = bridge_ip_checkbasic(mp);
 2994                                 break;
 2995 #ifdef INET6
 2996                         case ETHERTYPE_IPV6:
 2997                                 error = bridge_ip6_checkbasic(mp);
 2998                                 break;
 2999 #endif /* INET6 */
 3000                         default:
 3001                                 error = 0;
 3002                 }
 3003                 if (error)
 3004                         goto bad;
 3005         }
 3006 
 3007         if (IPFW_LOADED && pfil_ipfw != 0 && dir == PFIL_OUT && ifp != NULL) {
 3008                 error = -1;
 3009                 args.rule = ip_dn_claim_rule(*mp);
 3010                 if (args.rule != NULL && fw_one_pass)
 3011                         goto ipfwpass; /* packet already partially processed */
 3012 
 3013                 args.m = *mp;
 3014                 args.oif = ifp;
 3015                 args.next_hop = NULL;
 3016                 args.eh = &eh2;
 3017                 args.inp = NULL;        /* used by ipfw uid/gid/jail rules */
 3018                 i = ip_fw_chk_ptr(&args);
 3019                 *mp = args.m;
 3020 
 3021                 if (*mp == NULL)
 3022                         return (error);
 3023 
 3024                 if (DUMMYNET_LOADED && (i == IP_FW_DUMMYNET)) {
 3025 
 3026                         /* put the Ethernet header back on */
 3027                         M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT);
 3028                         if (*mp == NULL)
 3029                                 return (error);
 3030                         bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
 3031 
 3032                         /*
 3033                          * Pass the pkt to dummynet, which consumes it. The
 3034                          * packet will return to us via bridge_dummynet().
 3035                          */
 3036                         args.oif = ifp;
 3037                         ip_dn_io_ptr(mp, DN_TO_IFB_FWD, &args);
 3038                         return (error);
 3039                 }
 3040 
 3041                 if (i != IP_FW_PASS) /* drop */
 3042                         goto bad;
 3043         }
 3044 
 3045 ipfwpass:
 3046         error = 0;
 3047 
 3048         /*
 3049          * Run the packet through pfil
 3050          */
 3051         switch (ether_type) {
 3052         case ETHERTYPE_IP:
 3053                 /*
 3054                  * before calling the firewall, swap fields the same as
 3055                  * IP does. here we assume the header is contiguous
 3056                  */
 3057                 ip = mtod(*mp, struct ip *);
 3058 
 3059                 ip->ip_len = ntohs(ip->ip_len);
 3060                 ip->ip_off = ntohs(ip->ip_off);
 3061 
 3062                 /*
 3063                  * Run pfil on the member interface and the bridge, both can
 3064                  * be skipped by clearing pfil_member or pfil_bridge.
 3065                  *
 3066                  * Keep the order:
 3067                  *   in_if -> bridge_if -> out_if
 3068                  */
 3069                 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
 3070                         error = pfil_run_hooks(&inet_pfil_hook, mp, bifp,
 3071                                         dir, NULL);
 3072 
 3073                 if (*mp == NULL || error != 0) /* filter may consume */
 3074                         break;
 3075 
 3076                 if (pfil_member && ifp != NULL)
 3077                         error = pfil_run_hooks(&inet_pfil_hook, mp, ifp,
 3078                                         dir, NULL);
 3079 
 3080                 if (*mp == NULL || error != 0) /* filter may consume */
 3081                         break;
 3082 
 3083                 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
 3084                         error = pfil_run_hooks(&inet_pfil_hook, mp, bifp,
 3085                                         dir, NULL);
 3086 
 3087                 if (*mp == NULL || error != 0) /* filter may consume */
 3088                         break;
 3089 
 3090                 /* check if we need to fragment the packet */
 3091                 if (pfil_member && ifp != NULL && dir == PFIL_OUT) {
 3092                         i = (*mp)->m_pkthdr.len;
 3093                         if (i > ifp->if_mtu) {
 3094                                 error = bridge_fragment(ifp, *mp, &eh2, snap,
 3095                                             &llc1);
 3096                                 return (error);
 3097                         }
 3098                 }
 3099 
 3100                 /* Recalculate the ip checksum and restore byte ordering */
 3101                 ip = mtod(*mp, struct ip *);
 3102                 hlen = ip->ip_hl << 2;
 3103                 if (hlen < sizeof(struct ip))
 3104                         goto bad;
 3105                 if (hlen > (*mp)->m_len) {
 3106                         if ((*mp = m_pullup(*mp, hlen)) == 0)
 3107                                 goto bad;
 3108                         ip = mtod(*mp, struct ip *);
 3109                         if (ip == NULL)
 3110                                 goto bad;
 3111                 }
 3112                 ip->ip_len = htons(ip->ip_len);
 3113                 ip->ip_off = htons(ip->ip_off);
 3114                 ip->ip_sum = 0;
 3115                 if (hlen == sizeof(struct ip))
 3116                         ip->ip_sum = in_cksum_hdr(ip);
 3117                 else
 3118                         ip->ip_sum = in_cksum(*mp, hlen);
 3119 
 3120                 break;
 3121 #ifdef INET6
 3122         case ETHERTYPE_IPV6:
 3123                 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
 3124                         error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp,
 3125                                         dir, NULL);
 3126 
 3127                 if (*mp == NULL || error != 0) /* filter may consume */
 3128                         break;
 3129 
 3130                 if (pfil_member && ifp != NULL)
 3131                         error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp,
 3132                                         dir, NULL);
 3133 
 3134                 if (*mp == NULL || error != 0) /* filter may consume */
 3135                         break;
 3136 
 3137                 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
 3138                         error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp,
 3139                                         dir, NULL);
 3140                 break;
 3141 #endif
 3142         default:
 3143                 error = 0;
 3144                 break;
 3145         }
 3146 
 3147         if (*mp == NULL)
 3148                 return (error);
 3149         if (error != 0)
 3150                 goto bad;
 3151 
 3152         error = -1;
 3153 
 3154         /*
 3155          * Finally, put everything back the way it was and return
 3156          */
 3157         if (snap) {
 3158                 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT);
 3159                 if (*mp == NULL)
 3160                         return (error);
 3161                 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
 3162         }
 3163 
 3164         M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT);
 3165         if (*mp == NULL)
 3166                 return (error);
 3167         bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
 3168 
 3169         return (0);
 3170 
 3171 bad:
 3172         m_freem(*mp);
 3173         *mp = NULL;
 3174         return (error);
 3175 }
 3176 
 3177 /*
 3178  * Perform basic checks on header size since
 3179  * pfil assumes ip_input has already processed
 3180  * it for it.  Cut-and-pasted from ip_input.c.
 3181  * Given how simple the IPv6 version is,
 3182  * does the IPv4 version really need to be
 3183  * this complicated?
 3184  *
 3185  * XXX Should we update ipstat here, or not?
 3186  * XXX Right now we update ipstat but not
 3187  * XXX csum_counter.
 3188  */
 3189 static int
 3190 bridge_ip_checkbasic(struct mbuf **mp)
 3191 {
 3192         struct mbuf *m = *mp;
 3193         struct ip *ip;
 3194         int len, hlen;
 3195         u_short sum;
 3196 
 3197         if (*mp == NULL)
 3198                 return (-1);
 3199 
 3200         if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
 3201                 if ((m = m_copyup(m, sizeof(struct ip),
 3202                         (max_linkhdr + 3) & ~3)) == NULL) {
 3203                         /* XXXJRT new stat, please */
 3204                         ipstat.ips_toosmall++;
 3205                         goto bad;
 3206                 }
 3207         } else if (__predict_false(m->m_len < sizeof (struct ip))) {
 3208                 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
 3209                         ipstat.ips_toosmall++;
 3210                         goto bad;
 3211                 }
 3212         }
 3213         ip = mtod(m, struct ip *);
 3214         if (ip == NULL) goto bad;
 3215 
 3216         if (ip->ip_v != IPVERSION) {
 3217                 ipstat.ips_badvers++;
 3218                 goto bad;
 3219         }
 3220         hlen = ip->ip_hl << 2;
 3221         if (hlen < sizeof(struct ip)) { /* minimum header length */
 3222                 ipstat.ips_badhlen++;
 3223                 goto bad;
 3224         }
 3225         if (hlen > m->m_len) {
 3226                 if ((m = m_pullup(m, hlen)) == 0) {
 3227                         ipstat.ips_badhlen++;
 3228                         goto bad;
 3229                 }
 3230                 ip = mtod(m, struct ip *);
 3231                 if (ip == NULL) goto bad;
 3232         }
 3233 
 3234         if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
 3235                 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
 3236         } else {
 3237                 if (hlen == sizeof(struct ip)) {
 3238                         sum = in_cksum_hdr(ip);
 3239                 } else {
 3240                         sum = in_cksum(m, hlen);
 3241                 }
 3242         }
 3243         if (sum) {
 3244                 ipstat.ips_badsum++;
 3245                 goto bad;
 3246         }
 3247 
 3248         /* Retrieve the packet length. */
 3249         len = ntohs(ip->ip_len);
 3250 
 3251         /*
 3252          * Check for additional length bogosity
 3253          */
 3254         if (len < hlen) {
 3255                 ipstat.ips_badlen++;
 3256                 goto bad;
 3257         }
 3258 
 3259         /*
 3260          * Check that the amount of data in the buffers
 3261          * is as at least much as the IP header would have us expect.
 3262          * Drop packet if shorter than we expect.
 3263          */
 3264         if (m->m_pkthdr.len < len) {
 3265                 ipstat.ips_tooshort++;
 3266                 goto bad;
 3267         }
 3268 
 3269         /* Checks out, proceed */
 3270         *mp = m;
 3271         return (0);
 3272 
 3273 bad:
 3274         *mp = m;
 3275         return (-1);
 3276 }
 3277 
 3278 #ifdef INET6
 3279 /*
 3280  * Same as above, but for IPv6.
 3281  * Cut-and-pasted from ip6_input.c.
 3282  * XXX Should we update ip6stat, or not?
 3283  */
 3284 static int
 3285 bridge_ip6_checkbasic(struct mbuf **mp)
 3286 {
 3287         struct mbuf *m = *mp;
 3288         struct ip6_hdr *ip6;
 3289 
 3290         /*
 3291          * If the IPv6 header is not aligned, slurp it up into a new
 3292          * mbuf with space for link headers, in the event we forward
 3293          * it.  Otherwise, if it is aligned, make sure the entire base
 3294          * IPv6 header is in the first mbuf of the chain.
 3295          */
 3296         if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
 3297                 struct ifnet *inifp = m->m_pkthdr.rcvif;
 3298                 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
 3299                             (max_linkhdr + 3) & ~3)) == NULL) {
 3300                         /* XXXJRT new stat, please */
 3301                         ip6stat.ip6s_toosmall++;
 3302                         in6_ifstat_inc(inifp, ifs6_in_hdrerr);
 3303                         goto bad;
 3304                 }
 3305         } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
 3306                 struct ifnet *inifp = m->m_pkthdr.rcvif;
 3307                 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
 3308                         ip6stat.ip6s_toosmall++;
 3309                         in6_ifstat_inc(inifp, ifs6_in_hdrerr);
 3310                         goto bad;
 3311                 }
 3312         }
 3313 
 3314         ip6 = mtod(m, struct ip6_hdr *);
 3315 
 3316         if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
 3317                 ip6stat.ip6s_badvers++;
 3318                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
 3319                 goto bad;
 3320         }
 3321 
 3322         /* Checks out, proceed */
 3323         *mp = m;
 3324         return (0);
 3325 
 3326 bad:
 3327         *mp = m;
 3328         return (-1);
 3329 }
 3330 #endif /* INET6 */
 3331 
 3332 /*
 3333  * bridge_fragment:
 3334  *
 3335  *      Return a fragmented mbuf chain.
 3336  */
 3337 static int
 3338 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh,
 3339     int snap, struct llc *llc)
 3340 {
 3341         struct mbuf *m0;
 3342         struct ip *ip;
 3343         int error = -1;
 3344 
 3345         if (m->m_len < sizeof(struct ip) &&
 3346             (m = m_pullup(m, sizeof(struct ip))) == NULL)
 3347                 goto out;
 3348         ip = mtod(m, struct ip *);
 3349 
 3350         error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist,
 3351                     CSUM_DELAY_IP);
 3352         if (error)
 3353                 goto out;
 3354 
 3355         /* walk the chain and re-add the Ethernet header */
 3356         for (m0 = m; m0; m0 = m0->m_nextpkt) {
 3357                 if (error == 0) {
 3358                         if (snap) {
 3359                                 M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT);
 3360                                 if (m0 == NULL) {
 3361                                         error = ENOBUFS;
 3362                                         continue;
 3363                                 }
 3364                                 bcopy(llc, mtod(m0, caddr_t),
 3365                                     sizeof(struct llc));
 3366                         }
 3367                         M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT);
 3368                         if (m0 == NULL) {
 3369                                 error = ENOBUFS;
 3370                                 continue;
 3371                         }
 3372                         bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN);
 3373                 } else 
 3374                         m_freem(m);
 3375         }
 3376 
 3377         if (error == 0)
 3378                 ipstat.ips_fragmented++;
 3379 
 3380         return (error);
 3381 
 3382 out:
 3383         if (m != NULL)
 3384                 m_freem(m);
 3385         return (error);
 3386 }

Cache object: 541fd5dda6aaf8ae5abc20afd84b89a0


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