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 heterogeneous bridges).
   75  */
   76 
   77 #include <sys/cdefs.h>
   78 __FBSDID("$FreeBSD: releng/11.1/sys/net/if_bridge.c 313050 2017-02-01 20:27:38Z kp $");
   79 
   80 #include "opt_inet.h"
   81 #include "opt_inet6.h"
   82 
   83 #include <sys/param.h>
   84 #include <sys/eventhandler.h>
   85 #include <sys/mbuf.h>
   86 #include <sys/malloc.h>
   87 #include <sys/protosw.h>
   88 #include <sys/systm.h>
   89 #include <sys/jail.h>
   90 #include <sys/time.h>
   91 #include <sys/socket.h> /* for net/if.h */
   92 #include <sys/sockio.h>
   93 #include <sys/ctype.h>  /* string functions */
   94 #include <sys/kernel.h>
   95 #include <sys/random.h>
   96 #include <sys/syslog.h>
   97 #include <sys/sysctl.h>
   98 #include <vm/uma.h>
   99 #include <sys/module.h>
  100 #include <sys/priv.h>
  101 #include <sys/proc.h>
  102 #include <sys/lock.h>
  103 #include <sys/mutex.h>
  104 
  105 #include <net/bpf.h>
  106 #include <net/if.h>
  107 #include <net/if_clone.h>
  108 #include <net/if_dl.h>
  109 #include <net/if_types.h>
  110 #include <net/if_var.h>
  111 #include <net/pfil.h>
  112 #include <net/vnet.h>
  113 
  114 #include <netinet/in.h>
  115 #include <netinet/in_systm.h>
  116 #include <netinet/in_var.h>
  117 #include <netinet/ip.h>
  118 #include <netinet/ip_var.h>
  119 #ifdef INET6
  120 #include <netinet/ip6.h>
  121 #include <netinet6/ip6_var.h>
  122 #include <netinet6/in6_ifattach.h>
  123 #endif
  124 #if defined(INET) || defined(INET6)
  125 #include <netinet/ip_carp.h>
  126 #endif
  127 #include <machine/in_cksum.h>
  128 #include <netinet/if_ether.h>
  129 #include <net/bridgestp.h>
  130 #include <net/if_bridgevar.h>
  131 #include <net/if_llc.h>
  132 #include <net/if_vlan_var.h>
  133 
  134 #include <net/route.h>
  135 
  136 /*
  137  * Size of the route hash table.  Must be a power of two.
  138  */
  139 #ifndef BRIDGE_RTHASH_SIZE
  140 #define BRIDGE_RTHASH_SIZE              1024
  141 #endif
  142 
  143 #define BRIDGE_RTHASH_MASK              (BRIDGE_RTHASH_SIZE - 1)
  144 
  145 /*
  146  * Default maximum number of addresses to cache.
  147  */
  148 #ifndef BRIDGE_RTABLE_MAX
  149 #define BRIDGE_RTABLE_MAX               2000
  150 #endif
  151 
  152 /*
  153  * Timeout (in seconds) for entries learned dynamically.
  154  */
  155 #ifndef BRIDGE_RTABLE_TIMEOUT
  156 #define BRIDGE_RTABLE_TIMEOUT           (20 * 60)       /* same as ARP */
  157 #endif
  158 
  159 /*
  160  * Number of seconds between walks of the route list.
  161  */
  162 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
  163 #define BRIDGE_RTABLE_PRUNE_PERIOD      (5 * 60)
  164 #endif
  165 
  166 /*
  167  * List of capabilities to possibly mask on the member interface.
  168  */
  169 #define BRIDGE_IFCAPS_MASK              (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\
  170                                          IFCAP_TXCSUM_IPV6)
  171 
  172 /*
  173  * List of capabilities to strip
  174  */
  175 #define BRIDGE_IFCAPS_STRIP             IFCAP_LRO
  176 
  177 /*
  178  * Bridge interface list entry.
  179  */
  180 struct bridge_iflist {
  181         LIST_ENTRY(bridge_iflist) bif_next;
  182         struct ifnet            *bif_ifp;       /* member if */
  183         struct bstp_port        bif_stp;        /* STP state */
  184         uint32_t                bif_flags;      /* member if flags */
  185         int                     bif_savedcaps;  /* saved capabilities */
  186         uint32_t                bif_addrmax;    /* max # of addresses */
  187         uint32_t                bif_addrcnt;    /* cur. # of addresses */
  188         uint32_t                bif_addrexceeded;/* # of address violations */
  189 };
  190 
  191 /*
  192  * Bridge route node.
  193  */
  194 struct bridge_rtnode {
  195         LIST_ENTRY(bridge_rtnode) brt_hash;     /* hash table linkage */
  196         LIST_ENTRY(bridge_rtnode) brt_list;     /* list linkage */
  197         struct bridge_iflist    *brt_dst;       /* destination if */
  198         unsigned long           brt_expire;     /* expiration time */
  199         uint8_t                 brt_flags;      /* address flags */
  200         uint8_t                 brt_addr[ETHER_ADDR_LEN];
  201         uint16_t                brt_vlan;       /* vlan id */
  202 };
  203 #define brt_ifp                 brt_dst->bif_ifp
  204 
  205 /*
  206  * Software state for each bridge.
  207  */
  208 struct bridge_softc {
  209         struct ifnet            *sc_ifp;        /* make this an interface */
  210         LIST_ENTRY(bridge_softc) sc_list;
  211         struct mtx              sc_mtx;
  212         struct cv               sc_cv;
  213         uint32_t                sc_brtmax;      /* max # of addresses */
  214         uint32_t                sc_brtcnt;      /* cur. # of addresses */
  215         uint32_t                sc_brttimeout;  /* rt timeout in seconds */
  216         struct callout          sc_brcallout;   /* bridge callout */
  217         uint32_t                sc_iflist_ref;  /* refcount for sc_iflist */
  218         uint32_t                sc_iflist_xcnt; /* refcount for sc_iflist */
  219         LIST_HEAD(, bridge_iflist) sc_iflist;   /* member interface list */
  220         LIST_HEAD(, bridge_rtnode) *sc_rthash;  /* our forwarding table */
  221         LIST_HEAD(, bridge_rtnode) sc_rtlist;   /* list version of above */
  222         uint32_t                sc_rthash_key;  /* key for hash */
  223         LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */
  224         struct bstp_state       sc_stp;         /* STP state */
  225         uint32_t                sc_brtexceeded; /* # of cache drops */
  226         struct ifnet            *sc_ifaddr;     /* member mac copied from */
  227         u_char                  sc_defaddr[6];  /* Default MAC address */
  228 };
  229 
  230 static VNET_DEFINE(struct mtx, bridge_list_mtx);
  231 #define V_bridge_list_mtx       VNET(bridge_list_mtx)
  232 static eventhandler_tag bridge_detach_cookie;
  233 
  234 int     bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
  235 
  236 uma_zone_t bridge_rtnode_zone;
  237 
  238 static int      bridge_clone_create(struct if_clone *, int, caddr_t);
  239 static void     bridge_clone_destroy(struct ifnet *);
  240 
  241 static int      bridge_ioctl(struct ifnet *, u_long, caddr_t);
  242 static void     bridge_mutecaps(struct bridge_softc *);
  243 static void     bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
  244                     int);
  245 static void     bridge_ifdetach(void *arg __unused, struct ifnet *);
  246 static void     bridge_init(void *);
  247 static void     bridge_dummynet(struct mbuf *, struct ifnet *);
  248 static void     bridge_stop(struct ifnet *, int);
  249 static int      bridge_transmit(struct ifnet *, struct mbuf *);
  250 static void     bridge_qflush(struct ifnet *);
  251 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
  252 static int      bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
  253                     struct rtentry *);
  254 static int      bridge_enqueue(struct bridge_softc *, struct ifnet *,
  255                     struct mbuf *);
  256 static void     bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
  257 
  258 static void     bridge_forward(struct bridge_softc *, struct bridge_iflist *,
  259                     struct mbuf *m);
  260 
  261 static void     bridge_timer(void *);
  262 
  263 static void     bridge_broadcast(struct bridge_softc *, struct ifnet *,
  264                     struct mbuf *, int);
  265 static void     bridge_span(struct bridge_softc *, struct mbuf *);
  266 
  267 static int      bridge_rtupdate(struct bridge_softc *, const uint8_t *,
  268                     uint16_t, struct bridge_iflist *, int, uint8_t);
  269 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
  270                     uint16_t);
  271 static void     bridge_rttrim(struct bridge_softc *);
  272 static void     bridge_rtage(struct bridge_softc *);
  273 static void     bridge_rtflush(struct bridge_softc *, int);
  274 static int      bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
  275                     uint16_t);
  276 
  277 static void     bridge_rtable_init(struct bridge_softc *);
  278 static void     bridge_rtable_fini(struct bridge_softc *);
  279 
  280 static int      bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
  281 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
  282                     const uint8_t *, uint16_t);
  283 static int      bridge_rtnode_insert(struct bridge_softc *,
  284                     struct bridge_rtnode *);
  285 static void     bridge_rtnode_destroy(struct bridge_softc *,
  286                     struct bridge_rtnode *);
  287 static void     bridge_rtable_expire(struct ifnet *, int);
  288 static void     bridge_state_change(struct ifnet *, int);
  289 
  290 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
  291                     const char *name);
  292 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
  293                     struct ifnet *ifp);
  294 static void     bridge_delete_member(struct bridge_softc *,
  295                     struct bridge_iflist *, int);
  296 static void     bridge_delete_span(struct bridge_softc *,
  297                     struct bridge_iflist *);
  298 
  299 static int      bridge_ioctl_add(struct bridge_softc *, void *);
  300 static int      bridge_ioctl_del(struct bridge_softc *, void *);
  301 static int      bridge_ioctl_gifflags(struct bridge_softc *, void *);
  302 static int      bridge_ioctl_sifflags(struct bridge_softc *, void *);
  303 static int      bridge_ioctl_scache(struct bridge_softc *, void *);
  304 static int      bridge_ioctl_gcache(struct bridge_softc *, void *);
  305 static int      bridge_ioctl_gifs(struct bridge_softc *, void *);
  306 static int      bridge_ioctl_rts(struct bridge_softc *, void *);
  307 static int      bridge_ioctl_saddr(struct bridge_softc *, void *);
  308 static int      bridge_ioctl_sto(struct bridge_softc *, void *);
  309 static int      bridge_ioctl_gto(struct bridge_softc *, void *);
  310 static int      bridge_ioctl_daddr(struct bridge_softc *, void *);
  311 static int      bridge_ioctl_flush(struct bridge_softc *, void *);
  312 static int      bridge_ioctl_gpri(struct bridge_softc *, void *);
  313 static int      bridge_ioctl_spri(struct bridge_softc *, void *);
  314 static int      bridge_ioctl_ght(struct bridge_softc *, void *);
  315 static int      bridge_ioctl_sht(struct bridge_softc *, void *);
  316 static int      bridge_ioctl_gfd(struct bridge_softc *, void *);
  317 static int      bridge_ioctl_sfd(struct bridge_softc *, void *);
  318 static int      bridge_ioctl_gma(struct bridge_softc *, void *);
  319 static int      bridge_ioctl_sma(struct bridge_softc *, void *);
  320 static int      bridge_ioctl_sifprio(struct bridge_softc *, void *);
  321 static int      bridge_ioctl_sifcost(struct bridge_softc *, void *);
  322 static int      bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
  323 static int      bridge_ioctl_addspan(struct bridge_softc *, void *);
  324 static int      bridge_ioctl_delspan(struct bridge_softc *, void *);
  325 static int      bridge_ioctl_gbparam(struct bridge_softc *, void *);
  326 static int      bridge_ioctl_grte(struct bridge_softc *, void *);
  327 static int      bridge_ioctl_gifsstp(struct bridge_softc *, void *);
  328 static int      bridge_ioctl_sproto(struct bridge_softc *, void *);
  329 static int      bridge_ioctl_stxhc(struct bridge_softc *, void *);
  330 static int      bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
  331                     int);
  332 static int      bridge_ip_checkbasic(struct mbuf **mp);
  333 #ifdef INET6
  334 static int      bridge_ip6_checkbasic(struct mbuf **mp);
  335 #endif /* INET6 */
  336 static int      bridge_fragment(struct ifnet *, struct mbuf **mp,
  337                     struct ether_header *, int, struct llc *);
  338 static void     bridge_linkstate(struct ifnet *ifp);
  339 static void     bridge_linkcheck(struct bridge_softc *sc);
  340 
  341 extern void (*bridge_linkstate_p)(struct ifnet *ifp);
  342 
  343 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
  344 #define VLANTAGOF(_m)   \
  345     (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
  346 
  347 static struct bstp_cb_ops bridge_ops = {
  348         .bcb_state = bridge_state_change,
  349         .bcb_rtage = bridge_rtable_expire
  350 };
  351 
  352 SYSCTL_DECL(_net_link);
  353 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
  354 
  355 /* only pass IP[46] packets when pfil is enabled */
  356 static VNET_DEFINE(int, pfil_onlyip) = 1;
  357 #define V_pfil_onlyip   VNET(pfil_onlyip)
  358 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip,
  359     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0,
  360     "Only pass IP packets when pfil is enabled");
  361 
  362 /* run pfil hooks on the bridge interface */
  363 static VNET_DEFINE(int, pfil_bridge) = 1;
  364 #define V_pfil_bridge   VNET(pfil_bridge)
  365 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge,
  366     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0,
  367     "Packet filter on the bridge interface");
  368 
  369 /* layer2 filter with ipfw */
  370 static VNET_DEFINE(int, pfil_ipfw);
  371 #define V_pfil_ipfw     VNET(pfil_ipfw)
  372 
  373 /* layer2 ARP filter with ipfw */
  374 static VNET_DEFINE(int, pfil_ipfw_arp);
  375 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp)
  376 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp,
  377     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0,
  378     "Filter ARP packets through IPFW layer2");
  379 
  380 /* run pfil hooks on the member interface */
  381 static VNET_DEFINE(int, pfil_member) = 1;
  382 #define V_pfil_member   VNET(pfil_member)
  383 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member,
  384     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0,
  385     "Packet filter on the member interface");
  386 
  387 /* run pfil hooks on the physical interface for locally destined packets */
  388 static VNET_DEFINE(int, pfil_local_phys);
  389 #define V_pfil_local_phys       VNET(pfil_local_phys)
  390 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys,
  391     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0,
  392     "Packet filter on the physical interface for locally destined packets");
  393 
  394 /* log STP state changes */
  395 static VNET_DEFINE(int, log_stp);
  396 #define V_log_stp       VNET(log_stp)
  397 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp,
  398     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0,
  399     "Log STP state changes");
  400 
  401 /* share MAC with first bridge member */
  402 static VNET_DEFINE(int, bridge_inherit_mac);
  403 #define V_bridge_inherit_mac    VNET(bridge_inherit_mac)
  404 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac,
  405     CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0,
  406     "Inherit MAC address from the first bridge member");
  407 
  408 static VNET_DEFINE(int, allow_llz_overlap) = 0;
  409 #define V_allow_llz_overlap     VNET(allow_llz_overlap)
  410 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap,
  411     CTLFLAG_VNET | CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0,
  412     "Allow overlap of link-local scope "
  413     "zones of a bridge interface and the member interfaces");
  414 
  415 struct bridge_control {
  416         int     (*bc_func)(struct bridge_softc *, void *);
  417         int     bc_argsize;
  418         int     bc_flags;
  419 };
  420 
  421 #define BC_F_COPYIN             0x01    /* copy arguments in */
  422 #define BC_F_COPYOUT            0x02    /* copy arguments out */
  423 #define BC_F_SUSER              0x04    /* do super-user check */
  424 
  425 const struct bridge_control bridge_control_table[] = {
  426         { bridge_ioctl_add,             sizeof(struct ifbreq),
  427           BC_F_COPYIN|BC_F_SUSER },
  428         { bridge_ioctl_del,             sizeof(struct ifbreq),
  429           BC_F_COPYIN|BC_F_SUSER },
  430 
  431         { bridge_ioctl_gifflags,        sizeof(struct ifbreq),
  432           BC_F_COPYIN|BC_F_COPYOUT },
  433         { bridge_ioctl_sifflags,        sizeof(struct ifbreq),
  434           BC_F_COPYIN|BC_F_SUSER },
  435 
  436         { bridge_ioctl_scache,          sizeof(struct ifbrparam),
  437           BC_F_COPYIN|BC_F_SUSER },
  438         { bridge_ioctl_gcache,          sizeof(struct ifbrparam),
  439           BC_F_COPYOUT },
  440 
  441         { bridge_ioctl_gifs,            sizeof(struct ifbifconf),
  442           BC_F_COPYIN|BC_F_COPYOUT },
  443         { bridge_ioctl_rts,             sizeof(struct ifbaconf),
  444           BC_F_COPYIN|BC_F_COPYOUT },
  445 
  446         { bridge_ioctl_saddr,           sizeof(struct ifbareq),
  447           BC_F_COPYIN|BC_F_SUSER },
  448 
  449         { bridge_ioctl_sto,             sizeof(struct ifbrparam),
  450           BC_F_COPYIN|BC_F_SUSER },
  451         { bridge_ioctl_gto,             sizeof(struct ifbrparam),
  452           BC_F_COPYOUT },
  453 
  454         { bridge_ioctl_daddr,           sizeof(struct ifbareq),
  455           BC_F_COPYIN|BC_F_SUSER },
  456 
  457         { bridge_ioctl_flush,           sizeof(struct ifbreq),
  458           BC_F_COPYIN|BC_F_SUSER },
  459 
  460         { bridge_ioctl_gpri,            sizeof(struct ifbrparam),
  461           BC_F_COPYOUT },
  462         { bridge_ioctl_spri,            sizeof(struct ifbrparam),
  463           BC_F_COPYIN|BC_F_SUSER },
  464 
  465         { bridge_ioctl_ght,             sizeof(struct ifbrparam),
  466           BC_F_COPYOUT },
  467         { bridge_ioctl_sht,             sizeof(struct ifbrparam),
  468           BC_F_COPYIN|BC_F_SUSER },
  469 
  470         { bridge_ioctl_gfd,             sizeof(struct ifbrparam),
  471           BC_F_COPYOUT },
  472         { bridge_ioctl_sfd,             sizeof(struct ifbrparam),
  473           BC_F_COPYIN|BC_F_SUSER },
  474 
  475         { bridge_ioctl_gma,             sizeof(struct ifbrparam),
  476           BC_F_COPYOUT },
  477         { bridge_ioctl_sma,             sizeof(struct ifbrparam),
  478           BC_F_COPYIN|BC_F_SUSER },
  479 
  480         { bridge_ioctl_sifprio,         sizeof(struct ifbreq),
  481           BC_F_COPYIN|BC_F_SUSER },
  482 
  483         { bridge_ioctl_sifcost,         sizeof(struct ifbreq),
  484           BC_F_COPYIN|BC_F_SUSER },
  485 
  486         { bridge_ioctl_addspan,         sizeof(struct ifbreq),
  487           BC_F_COPYIN|BC_F_SUSER },
  488         { bridge_ioctl_delspan,         sizeof(struct ifbreq),
  489           BC_F_COPYIN|BC_F_SUSER },
  490 
  491         { bridge_ioctl_gbparam,         sizeof(struct ifbropreq),
  492           BC_F_COPYOUT },
  493 
  494         { bridge_ioctl_grte,            sizeof(struct ifbrparam),
  495           BC_F_COPYOUT },
  496 
  497         { bridge_ioctl_gifsstp,         sizeof(struct ifbpstpconf),
  498           BC_F_COPYIN|BC_F_COPYOUT },
  499 
  500         { bridge_ioctl_sproto,          sizeof(struct ifbrparam),
  501           BC_F_COPYIN|BC_F_SUSER },
  502 
  503         { bridge_ioctl_stxhc,           sizeof(struct ifbrparam),
  504           BC_F_COPYIN|BC_F_SUSER },
  505 
  506         { bridge_ioctl_sifmaxaddr,      sizeof(struct ifbreq),
  507           BC_F_COPYIN|BC_F_SUSER },
  508 
  509 };
  510 const int bridge_control_table_size = nitems(bridge_control_table);
  511 
  512 static VNET_DEFINE(LIST_HEAD(, bridge_softc), bridge_list);
  513 #define V_bridge_list   VNET(bridge_list)
  514 #define BRIDGE_LIST_LOCK_INIT(x)        mtx_init(&V_bridge_list_mtx,    \
  515                                             "if_bridge list", NULL, MTX_DEF)
  516 #define BRIDGE_LIST_LOCK_DESTROY(x)     mtx_destroy(&V_bridge_list_mtx)
  517 #define BRIDGE_LIST_LOCK(x)             mtx_lock(&V_bridge_list_mtx)
  518 #define BRIDGE_LIST_UNLOCK(x)           mtx_unlock(&V_bridge_list_mtx)
  519 
  520 static VNET_DEFINE(struct if_clone *, bridge_cloner);
  521 #define V_bridge_cloner VNET(bridge_cloner)
  522 
  523 static const char bridge_name[] = "bridge";
  524 
  525 static void
  526 vnet_bridge_init(const void *unused __unused)
  527 {
  528 
  529         BRIDGE_LIST_LOCK_INIT();
  530         LIST_INIT(&V_bridge_list);
  531         V_bridge_cloner = if_clone_simple(bridge_name,
  532             bridge_clone_create, bridge_clone_destroy, 0);
  533 }
  534 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
  535     vnet_bridge_init, NULL);
  536 
  537 static void
  538 vnet_bridge_uninit(const void *unused __unused)
  539 {
  540 
  541         if_clone_detach(V_bridge_cloner);
  542         V_bridge_cloner = NULL;
  543         BRIDGE_LIST_LOCK_DESTROY();
  544 }
  545 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
  546     vnet_bridge_uninit, NULL);
  547 
  548 static int
  549 bridge_modevent(module_t mod, int type, void *data)
  550 {
  551 
  552         switch (type) {
  553         case MOD_LOAD:
  554                 bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
  555                     sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
  556                     UMA_ALIGN_PTR, 0);
  557                 bridge_input_p = bridge_input;
  558                 bridge_output_p = bridge_output;
  559                 bridge_dn_p = bridge_dummynet;
  560                 bridge_linkstate_p = bridge_linkstate;
  561                 bridge_detach_cookie = EVENTHANDLER_REGISTER(
  562                     ifnet_departure_event, bridge_ifdetach, NULL,
  563                     EVENTHANDLER_PRI_ANY);
  564                 break;
  565         case MOD_UNLOAD:
  566                 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
  567                     bridge_detach_cookie);
  568                 uma_zdestroy(bridge_rtnode_zone);
  569                 bridge_input_p = NULL;
  570                 bridge_output_p = NULL;
  571                 bridge_dn_p = NULL;
  572                 bridge_linkstate_p = NULL;
  573                 break;
  574         default:
  575                 return (EOPNOTSUPP);
  576         }
  577         return (0);
  578 }
  579 
  580 static moduledata_t bridge_mod = {
  581         "if_bridge",
  582         bridge_modevent,
  583         0
  584 };
  585 
  586 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
  587 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
  588 
  589 /*
  590  * handler for net.link.bridge.ipfw
  591  */
  592 static int
  593 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
  594 {
  595         int enable = V_pfil_ipfw;
  596         int error;
  597 
  598         error = sysctl_handle_int(oidp, &enable, 0, req);
  599         enable &= 1;
  600 
  601         if (enable != V_pfil_ipfw) {
  602                 V_pfil_ipfw = enable;
  603 
  604                 /*
  605                  * Disable pfil so that ipfw doesnt run twice, if the user
  606                  * really wants both then they can re-enable pfil_bridge and/or
  607                  * pfil_member. Also allow non-ip packets as ipfw can filter by
  608                  * layer2 type.
  609                  */
  610                 if (V_pfil_ipfw) {
  611                         V_pfil_onlyip = 0;
  612                         V_pfil_bridge = 0;
  613                         V_pfil_member = 0;
  614                 }
  615         }
  616 
  617         return (error);
  618 }
  619 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw,
  620     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET,
  621     &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I",
  622     "Layer2 filter with IPFW");
  623 
  624 /*
  625  * bridge_clone_create:
  626  *
  627  *      Create a new bridge instance.
  628  */
  629 static int
  630 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
  631 {
  632         struct bridge_softc *sc, *sc2;
  633         struct ifnet *bifp, *ifp;
  634         int fb, retry;
  635         unsigned long hostid;
  636 
  637         sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
  638         ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
  639         if (ifp == NULL) {
  640                 free(sc, M_DEVBUF);
  641                 return (ENOSPC);
  642         }
  643 
  644         BRIDGE_LOCK_INIT(sc);
  645         sc->sc_brtmax = BRIDGE_RTABLE_MAX;
  646         sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
  647 
  648         /* Initialize our routing table. */
  649         bridge_rtable_init(sc);
  650 
  651         callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
  652 
  653         LIST_INIT(&sc->sc_iflist);
  654         LIST_INIT(&sc->sc_spanlist);
  655 
  656         ifp->if_softc = sc;
  657         if_initname(ifp, bridge_name, unit);
  658         ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
  659         ifp->if_ioctl = bridge_ioctl;
  660         ifp->if_transmit = bridge_transmit;
  661         ifp->if_qflush = bridge_qflush;
  662         ifp->if_init = bridge_init;
  663         ifp->if_type = IFT_BRIDGE;
  664 
  665         /*
  666          * Generate an ethernet address with a locally administered address.
  667          *
  668          * Since we are using random ethernet addresses for the bridge, it is
  669          * possible that we might have address collisions, so make sure that
  670          * this hardware address isn't already in use on another bridge.
  671          * The first try uses the hostid and falls back to arc4rand().
  672          */
  673         fb = 0;
  674         getcredhostid(curthread->td_ucred, &hostid);
  675         do {
  676                 if (fb || hostid == 0) {
  677                         arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1);
  678                         sc->sc_defaddr[0] &= ~1;/* clear multicast bit */
  679                         sc->sc_defaddr[0] |= 2; /* set the LAA bit */
  680                 } else {
  681                         sc->sc_defaddr[0] = 0x2;
  682                         sc->sc_defaddr[1] = (hostid >> 24) & 0xff;
  683                         sc->sc_defaddr[2] = (hostid >> 16) & 0xff;
  684                         sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff;
  685                         sc->sc_defaddr[4] =  hostid        & 0xff;
  686                         sc->sc_defaddr[5] = ifp->if_dunit & 0xff;
  687                 }
  688 
  689                 fb = 1;
  690                 retry = 0;
  691                 BRIDGE_LIST_LOCK();
  692                 LIST_FOREACH(sc2, &V_bridge_list, sc_list) {
  693                         bifp = sc2->sc_ifp;
  694                         if (memcmp(sc->sc_defaddr,
  695                             IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) {
  696                                 retry = 1;
  697                                 break;
  698                         }
  699                 }
  700                 BRIDGE_LIST_UNLOCK();
  701         } while (retry == 1);
  702 
  703         bstp_attach(&sc->sc_stp, &bridge_ops);
  704         ether_ifattach(ifp, sc->sc_defaddr);
  705         /* Now undo some of the damage... */
  706         ifp->if_baudrate = 0;
  707         ifp->if_type = IFT_BRIDGE;
  708 
  709         BRIDGE_LIST_LOCK();
  710         LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list);
  711         BRIDGE_LIST_UNLOCK();
  712 
  713         return (0);
  714 }
  715 
  716 /*
  717  * bridge_clone_destroy:
  718  *
  719  *      Destroy a bridge instance.
  720  */
  721 static void
  722 bridge_clone_destroy(struct ifnet *ifp)
  723 {
  724         struct bridge_softc *sc = ifp->if_softc;
  725         struct bridge_iflist *bif;
  726 
  727         BRIDGE_LOCK(sc);
  728 
  729         bridge_stop(ifp, 1);
  730         ifp->if_flags &= ~IFF_UP;
  731 
  732         while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
  733                 bridge_delete_member(sc, bif, 0);
  734 
  735         while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
  736                 bridge_delete_span(sc, bif);
  737         }
  738 
  739         BRIDGE_UNLOCK(sc);
  740 
  741         callout_drain(&sc->sc_brcallout);
  742 
  743         BRIDGE_LIST_LOCK();
  744         LIST_REMOVE(sc, sc_list);
  745         BRIDGE_LIST_UNLOCK();
  746 
  747         bstp_detach(&sc->sc_stp);
  748         ether_ifdetach(ifp);
  749         if_free(ifp);
  750 
  751         /* Tear down the routing table. */
  752         bridge_rtable_fini(sc);
  753 
  754         BRIDGE_LOCK_DESTROY(sc);
  755         free(sc, M_DEVBUF);
  756 }
  757 
  758 /*
  759  * bridge_ioctl:
  760  *
  761  *      Handle a control request from the operator.
  762  */
  763 static int
  764 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
  765 {
  766         struct bridge_softc *sc = ifp->if_softc;
  767         struct ifreq *ifr = (struct ifreq *)data;
  768         struct bridge_iflist *bif;
  769         struct thread *td = curthread;
  770         union {
  771                 struct ifbreq ifbreq;
  772                 struct ifbifconf ifbifconf;
  773                 struct ifbareq ifbareq;
  774                 struct ifbaconf ifbaconf;
  775                 struct ifbrparam ifbrparam;
  776                 struct ifbropreq ifbropreq;
  777         } args;
  778         struct ifdrv *ifd = (struct ifdrv *) data;
  779         const struct bridge_control *bc;
  780         int error = 0;
  781 
  782         switch (cmd) {
  783 
  784         case SIOCADDMULTI:
  785         case SIOCDELMULTI:
  786                 break;
  787 
  788         case SIOCGDRVSPEC:
  789         case SIOCSDRVSPEC:
  790                 if (ifd->ifd_cmd >= bridge_control_table_size) {
  791                         error = EINVAL;
  792                         break;
  793                 }
  794                 bc = &bridge_control_table[ifd->ifd_cmd];
  795 
  796                 if (cmd == SIOCGDRVSPEC &&
  797                     (bc->bc_flags & BC_F_COPYOUT) == 0) {
  798                         error = EINVAL;
  799                         break;
  800                 }
  801                 else if (cmd == SIOCSDRVSPEC &&
  802                     (bc->bc_flags & BC_F_COPYOUT) != 0) {
  803                         error = EINVAL;
  804                         break;
  805                 }
  806 
  807                 if (bc->bc_flags & BC_F_SUSER) {
  808                         error = priv_check(td, PRIV_NET_BRIDGE);
  809                         if (error)
  810                                 break;
  811                 }
  812 
  813                 if (ifd->ifd_len != bc->bc_argsize ||
  814                     ifd->ifd_len > sizeof(args)) {
  815                         error = EINVAL;
  816                         break;
  817                 }
  818 
  819                 bzero(&args, sizeof(args));
  820                 if (bc->bc_flags & BC_F_COPYIN) {
  821                         error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
  822                         if (error)
  823                                 break;
  824                 }
  825 
  826                 BRIDGE_LOCK(sc);
  827                 error = (*bc->bc_func)(sc, &args);
  828                 BRIDGE_UNLOCK(sc);
  829                 if (error)
  830                         break;
  831 
  832                 if (bc->bc_flags & BC_F_COPYOUT)
  833                         error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
  834 
  835                 break;
  836 
  837         case SIOCSIFFLAGS:
  838                 if (!(ifp->if_flags & IFF_UP) &&
  839                     (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
  840                         /*
  841                          * If interface is marked down and it is running,
  842                          * then stop and disable it.
  843                          */
  844                         BRIDGE_LOCK(sc);
  845                         bridge_stop(ifp, 1);
  846                         BRIDGE_UNLOCK(sc);
  847                 } else if ((ifp->if_flags & IFF_UP) &&
  848                     !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
  849                         /*
  850                          * If interface is marked up and it is stopped, then
  851                          * start it.
  852                          */
  853                         (*ifp->if_init)(sc);
  854                 }
  855                 break;
  856 
  857         case SIOCSIFMTU:
  858                 if (ifr->ifr_mtu < 576) {
  859                         error = EINVAL;
  860                         break;
  861                 }
  862                 if (LIST_EMPTY(&sc->sc_iflist)) {
  863                         sc->sc_ifp->if_mtu = ifr->ifr_mtu;
  864                         break;
  865                 }
  866                 BRIDGE_LOCK(sc);
  867                 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
  868                         if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) {
  869                                 log(LOG_NOTICE, "%s: invalid MTU: %u(%s)"
  870                                     " != %d\n", sc->sc_ifp->if_xname,
  871                                     bif->bif_ifp->if_mtu,
  872                                     bif->bif_ifp->if_xname, ifr->ifr_mtu);
  873                                 error = EINVAL;
  874                                 break;
  875                         }
  876                 }
  877                 if (!error)
  878                         sc->sc_ifp->if_mtu = ifr->ifr_mtu;
  879                 BRIDGE_UNLOCK(sc);
  880                 break;
  881         default:
  882                 /*
  883                  * drop the lock as ether_ioctl() will call bridge_start() and
  884                  * cause the lock to be recursed.
  885                  */
  886                 error = ether_ioctl(ifp, cmd, data);
  887                 break;
  888         }
  889 
  890         return (error);
  891 }
  892 
  893 /*
  894  * bridge_mutecaps:
  895  *
  896  *      Clear or restore unwanted capabilities on the member interface
  897  */
  898 static void
  899 bridge_mutecaps(struct bridge_softc *sc)
  900 {
  901         struct bridge_iflist *bif;
  902         int enabled, mask;
  903 
  904         /* Initial bitmask of capabilities to test */
  905         mask = BRIDGE_IFCAPS_MASK;
  906 
  907         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
  908                 /* Every member must support it or its disabled */
  909                 mask &= bif->bif_savedcaps;
  910         }
  911 
  912         BRIDGE_XLOCK(sc);
  913         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
  914                 enabled = bif->bif_ifp->if_capenable;
  915                 enabled &= ~BRIDGE_IFCAPS_STRIP;
  916                 /* strip off mask bits and enable them again if allowed */
  917                 enabled &= ~BRIDGE_IFCAPS_MASK;
  918                 enabled |= mask;
  919                 BRIDGE_UNLOCK(sc);
  920                 bridge_set_ifcap(sc, bif, enabled);
  921                 BRIDGE_LOCK(sc);
  922         }
  923         BRIDGE_XDROP(sc);
  924 
  925 }
  926 
  927 static void
  928 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
  929 {
  930         struct ifnet *ifp = bif->bif_ifp;
  931         struct ifreq ifr;
  932         int error;
  933 
  934         BRIDGE_UNLOCK_ASSERT(sc);
  935 
  936         bzero(&ifr, sizeof(ifr));
  937         ifr.ifr_reqcap = set;
  938 
  939         if (ifp->if_capenable != set) {
  940                 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
  941                 if (error)
  942                         if_printf(sc->sc_ifp,
  943                             "error setting interface capabilities on %s\n",
  944                             ifp->if_xname);
  945         }
  946 }
  947 
  948 /*
  949  * bridge_lookup_member:
  950  *
  951  *      Lookup a bridge member interface.
  952  */
  953 static struct bridge_iflist *
  954 bridge_lookup_member(struct bridge_softc *sc, const char *name)
  955 {
  956         struct bridge_iflist *bif;
  957         struct ifnet *ifp;
  958 
  959         BRIDGE_LOCK_ASSERT(sc);
  960 
  961         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
  962                 ifp = bif->bif_ifp;
  963                 if (strcmp(ifp->if_xname, name) == 0)
  964                         return (bif);
  965         }
  966 
  967         return (NULL);
  968 }
  969 
  970 /*
  971  * bridge_lookup_member_if:
  972  *
  973  *      Lookup a bridge member interface by ifnet*.
  974  */
  975 static struct bridge_iflist *
  976 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
  977 {
  978         struct bridge_iflist *bif;
  979 
  980         BRIDGE_LOCK_ASSERT(sc);
  981 
  982         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
  983                 if (bif->bif_ifp == member_ifp)
  984                         return (bif);
  985         }
  986 
  987         return (NULL);
  988 }
  989 
  990 /*
  991  * bridge_delete_member:
  992  *
  993  *      Delete the specified member interface.
  994  */
  995 static void
  996 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
  997     int gone)
  998 {
  999         struct ifnet *ifs = bif->bif_ifp;
 1000         struct ifnet *fif = NULL;
 1001 
 1002         BRIDGE_LOCK_ASSERT(sc);
 1003 
 1004         if (bif->bif_flags & IFBIF_STP)
 1005                 bstp_disable(&bif->bif_stp);
 1006 
 1007         ifs->if_bridge = NULL;
 1008         BRIDGE_XLOCK(sc);
 1009         LIST_REMOVE(bif, bif_next);
 1010         BRIDGE_XDROP(sc);
 1011 
 1012         /*
 1013          * If removing the interface that gave the bridge its mac address, set
 1014          * the mac address of the bridge to the address of the next member, or
 1015          * to its default address if no members are left.
 1016          */
 1017         if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) {
 1018                 if (LIST_EMPTY(&sc->sc_iflist)) {
 1019                         bcopy(sc->sc_defaddr,
 1020                             IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
 1021                         sc->sc_ifaddr = NULL;
 1022                 } else {
 1023                         fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp;
 1024                         bcopy(IF_LLADDR(fif),
 1025                             IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
 1026                         sc->sc_ifaddr = fif;
 1027                 }
 1028                 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
 1029         }
 1030 
 1031         bridge_linkcheck(sc);
 1032         bridge_mutecaps(sc);    /* recalcuate now this interface is removed */
 1033         bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
 1034         KASSERT(bif->bif_addrcnt == 0,
 1035             ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
 1036 
 1037         BRIDGE_UNLOCK(sc);
 1038         if (!gone) {
 1039                 switch (ifs->if_type) {
 1040                 case IFT_ETHER:
 1041                 case IFT_L2VLAN:
 1042                         /*
 1043                          * Take the interface out of promiscuous mode, but only
 1044                          * if it was promiscuous in the first place. It might
 1045                          * not be if we're in the bridge_ioctl_add() error path.
 1046                          */
 1047                         if (ifs->if_flags & IFF_PROMISC)
 1048                                 (void) ifpromisc(ifs, 0);
 1049                         break;
 1050 
 1051                 case IFT_GIF:
 1052                         break;
 1053 
 1054                 default:
 1055 #ifdef DIAGNOSTIC
 1056                         panic("bridge_delete_member: impossible");
 1057 #endif
 1058                         break;
 1059                 }
 1060                 /* reneable any interface capabilities */
 1061                 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
 1062         }
 1063         bstp_destroy(&bif->bif_stp);    /* prepare to free */
 1064         BRIDGE_LOCK(sc);
 1065         free(bif, M_DEVBUF);
 1066 }
 1067 
 1068 /*
 1069  * bridge_delete_span:
 1070  *
 1071  *      Delete the specified span interface.
 1072  */
 1073 static void
 1074 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
 1075 {
 1076         BRIDGE_LOCK_ASSERT(sc);
 1077 
 1078         KASSERT(bif->bif_ifp->if_bridge == NULL,
 1079             ("%s: not a span interface", __func__));
 1080 
 1081         LIST_REMOVE(bif, bif_next);
 1082         free(bif, M_DEVBUF);
 1083 }
 1084 
 1085 static int
 1086 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
 1087 {
 1088         struct ifbreq *req = arg;
 1089         struct bridge_iflist *bif = NULL;
 1090         struct ifnet *ifs;
 1091         int error = 0;
 1092 
 1093         ifs = ifunit(req->ifbr_ifsname);
 1094         if (ifs == NULL)
 1095                 return (ENOENT);
 1096         if (ifs->if_ioctl == NULL)      /* must be supported */
 1097                 return (EINVAL);
 1098 
 1099         /* If it's in the span list, it can't be a member. */
 1100         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
 1101                 if (ifs == bif->bif_ifp)
 1102                         return (EBUSY);
 1103 
 1104         if (ifs->if_bridge == sc)
 1105                 return (EEXIST);
 1106 
 1107         if (ifs->if_bridge != NULL)
 1108                 return (EBUSY);
 1109 
 1110         switch (ifs->if_type) {
 1111         case IFT_ETHER:
 1112         case IFT_L2VLAN:
 1113         case IFT_GIF:
 1114                 /* permitted interface types */
 1115                 break;
 1116         default:
 1117                 return (EINVAL);
 1118         }
 1119 
 1120 #ifdef INET6
 1121         /*
 1122          * Two valid inet6 addresses with link-local scope must not be
 1123          * on the parent interface and the member interfaces at the
 1124          * same time.  This restriction is needed to prevent violation
 1125          * of link-local scope zone.  Attempts to add a member
 1126          * interface which has inet6 addresses when the parent has
 1127          * inet6 triggers removal of all inet6 addresses on the member
 1128          * interface.
 1129          */
 1130 
 1131         /* Check if the parent interface has a link-local scope addr. */
 1132         if (V_allow_llz_overlap == 0 &&
 1133             in6ifa_llaonifp(sc->sc_ifp) != NULL) {
 1134                 /*
 1135                  * If any, remove all inet6 addresses from the member
 1136                  * interfaces.
 1137                  */
 1138                 BRIDGE_XLOCK(sc);
 1139                 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 1140                         if (in6ifa_llaonifp(bif->bif_ifp)) {
 1141                                 BRIDGE_UNLOCK(sc);
 1142                                 in6_ifdetach(bif->bif_ifp);
 1143                                 BRIDGE_LOCK(sc);
 1144                                 if_printf(sc->sc_ifp,
 1145                                     "IPv6 addresses on %s have been removed "
 1146                                     "before adding it as a member to prevent "
 1147                                     "IPv6 address scope violation.\n",
 1148                                     bif->bif_ifp->if_xname);
 1149                         }
 1150                 }
 1151                 BRIDGE_XDROP(sc);
 1152                 if (in6ifa_llaonifp(ifs)) {
 1153                         BRIDGE_UNLOCK(sc);
 1154                         in6_ifdetach(ifs);
 1155                         BRIDGE_LOCK(sc);
 1156                         if_printf(sc->sc_ifp,
 1157                             "IPv6 addresses on %s have been removed "
 1158                             "before adding it as a member to prevent "
 1159                             "IPv6 address scope violation.\n",
 1160                             ifs->if_xname);
 1161                 }
 1162         }
 1163 #endif
 1164         /* Allow the first Ethernet member to define the MTU */
 1165         if (LIST_EMPTY(&sc->sc_iflist))
 1166                 sc->sc_ifp->if_mtu = ifs->if_mtu;
 1167         else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
 1168                 if_printf(sc->sc_ifp, "invalid MTU: %u(%s) != %u\n",
 1169                     ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu);
 1170                 return (EINVAL);
 1171         }
 1172 
 1173         bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
 1174         if (bif == NULL)
 1175                 return (ENOMEM);
 1176 
 1177         bif->bif_ifp = ifs;
 1178         bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
 1179         bif->bif_savedcaps = ifs->if_capenable;
 1180 
 1181         /*
 1182          * Assign the interface's MAC address to the bridge if it's the first
 1183          * member and the MAC address of the bridge has not been changed from
 1184          * the default randomly generated one.
 1185          */
 1186         if (V_bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) &&
 1187             !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) {
 1188                 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
 1189                 sc->sc_ifaddr = ifs;
 1190                 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
 1191         }
 1192 
 1193         ifs->if_bridge = sc;
 1194         bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
 1195         /*
 1196          * XXX: XLOCK HERE!?!
 1197          *
 1198          * NOTE: insert_***HEAD*** should be safe for the traversals.
 1199          */
 1200         LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
 1201 
 1202         /* Set interface capabilities to the intersection set of all members */
 1203         bridge_mutecaps(sc);
 1204         bridge_linkcheck(sc);
 1205 
 1206         /* Place the interface into promiscuous mode */
 1207         switch (ifs->if_type) {
 1208                 case IFT_ETHER:
 1209                 case IFT_L2VLAN:
 1210                         BRIDGE_UNLOCK(sc);
 1211                         error = ifpromisc(ifs, 1);
 1212                         BRIDGE_LOCK(sc);
 1213                         break;
 1214         }
 1215 
 1216         if (error)
 1217                 bridge_delete_member(sc, bif, 0);
 1218         return (error);
 1219 }
 1220 
 1221 static int
 1222 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
 1223 {
 1224         struct ifbreq *req = arg;
 1225         struct bridge_iflist *bif;
 1226 
 1227         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
 1228         if (bif == NULL)
 1229                 return (ENOENT);
 1230 
 1231         bridge_delete_member(sc, bif, 0);
 1232 
 1233         return (0);
 1234 }
 1235 
 1236 static int
 1237 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
 1238 {
 1239         struct ifbreq *req = arg;
 1240         struct bridge_iflist *bif;
 1241         struct bstp_port *bp;
 1242 
 1243         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
 1244         if (bif == NULL)
 1245                 return (ENOENT);
 1246 
 1247         bp = &bif->bif_stp;
 1248         req->ifbr_ifsflags = bif->bif_flags;
 1249         req->ifbr_state = bp->bp_state;
 1250         req->ifbr_priority = bp->bp_priority;
 1251         req->ifbr_path_cost = bp->bp_path_cost;
 1252         req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
 1253         req->ifbr_proto = bp->bp_protover;
 1254         req->ifbr_role = bp->bp_role;
 1255         req->ifbr_stpflags = bp->bp_flags;
 1256         req->ifbr_addrcnt = bif->bif_addrcnt;
 1257         req->ifbr_addrmax = bif->bif_addrmax;
 1258         req->ifbr_addrexceeded = bif->bif_addrexceeded;
 1259 
 1260         /* Copy STP state options as flags */
 1261         if (bp->bp_operedge)
 1262                 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
 1263         if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
 1264                 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
 1265         if (bp->bp_ptp_link)
 1266                 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
 1267         if (bp->bp_flags & BSTP_PORT_AUTOPTP)
 1268                 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
 1269         if (bp->bp_flags & BSTP_PORT_ADMEDGE)
 1270                 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
 1271         if (bp->bp_flags & BSTP_PORT_ADMCOST)
 1272                 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
 1273         return (0);
 1274 }
 1275 
 1276 static int
 1277 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
 1278 {
 1279         struct ifbreq *req = arg;
 1280         struct bridge_iflist *bif;
 1281         struct bstp_port *bp;
 1282         int error;
 1283 
 1284         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
 1285         if (bif == NULL)
 1286                 return (ENOENT);
 1287         bp = &bif->bif_stp;
 1288 
 1289         if (req->ifbr_ifsflags & IFBIF_SPAN)
 1290                 /* SPAN is readonly */
 1291                 return (EINVAL);
 1292 
 1293         if (req->ifbr_ifsflags & IFBIF_STP) {
 1294                 if ((bif->bif_flags & IFBIF_STP) == 0) {
 1295                         error = bstp_enable(&bif->bif_stp);
 1296                         if (error)
 1297                                 return (error);
 1298                 }
 1299         } else {
 1300                 if ((bif->bif_flags & IFBIF_STP) != 0)
 1301                         bstp_disable(&bif->bif_stp);
 1302         }
 1303 
 1304         /* Pass on STP flags */
 1305         bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
 1306         bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
 1307         bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
 1308         bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
 1309 
 1310         /* Save the bits relating to the bridge */
 1311         bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
 1312 
 1313         return (0);
 1314 }
 1315 
 1316 static int
 1317 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
 1318 {
 1319         struct ifbrparam *param = arg;
 1320 
 1321         sc->sc_brtmax = param->ifbrp_csize;
 1322         bridge_rttrim(sc);
 1323 
 1324         return (0);
 1325 }
 1326 
 1327 static int
 1328 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
 1329 {
 1330         struct ifbrparam *param = arg;
 1331 
 1332         param->ifbrp_csize = sc->sc_brtmax;
 1333 
 1334         return (0);
 1335 }
 1336 
 1337 static int
 1338 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
 1339 {
 1340         struct ifbifconf *bifc = arg;
 1341         struct bridge_iflist *bif;
 1342         struct ifbreq breq;
 1343         char *buf, *outbuf;
 1344         int count, buflen, len, error = 0;
 1345 
 1346         count = 0;
 1347         LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
 1348                 count++;
 1349         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
 1350                 count++;
 1351 
 1352         buflen = sizeof(breq) * count;
 1353         if (bifc->ifbic_len == 0) {
 1354                 bifc->ifbic_len = buflen;
 1355                 return (0);
 1356         }
 1357         BRIDGE_UNLOCK(sc);
 1358         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
 1359         BRIDGE_LOCK(sc);
 1360 
 1361         count = 0;
 1362         buf = outbuf;
 1363         len = min(bifc->ifbic_len, buflen);
 1364         bzero(&breq, sizeof(breq));
 1365         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 1366                 if (len < sizeof(breq))
 1367                         break;
 1368 
 1369                 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
 1370                     sizeof(breq.ifbr_ifsname));
 1371                 /* Fill in the ifbreq structure */
 1372                 error = bridge_ioctl_gifflags(sc, &breq);
 1373                 if (error)
 1374                         break;
 1375                 memcpy(buf, &breq, sizeof(breq));
 1376                 count++;
 1377                 buf += sizeof(breq);
 1378                 len -= sizeof(breq);
 1379         }
 1380         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
 1381                 if (len < sizeof(breq))
 1382                         break;
 1383 
 1384                 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
 1385                     sizeof(breq.ifbr_ifsname));
 1386                 breq.ifbr_ifsflags = bif->bif_flags;
 1387                 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
 1388                 memcpy(buf, &breq, sizeof(breq));
 1389                 count++;
 1390                 buf += sizeof(breq);
 1391                 len -= sizeof(breq);
 1392         }
 1393 
 1394         BRIDGE_UNLOCK(sc);
 1395         bifc->ifbic_len = sizeof(breq) * count;
 1396         error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
 1397         BRIDGE_LOCK(sc);
 1398         free(outbuf, M_TEMP);
 1399         return (error);
 1400 }
 1401 
 1402 static int
 1403 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
 1404 {
 1405         struct ifbaconf *bac = arg;
 1406         struct bridge_rtnode *brt;
 1407         struct ifbareq bareq;
 1408         char *buf, *outbuf;
 1409         int count, buflen, len, error = 0;
 1410 
 1411         if (bac->ifbac_len == 0)
 1412                 return (0);
 1413 
 1414         count = 0;
 1415         LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
 1416                 count++;
 1417         buflen = sizeof(bareq) * count;
 1418 
 1419         BRIDGE_UNLOCK(sc);
 1420         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
 1421         BRIDGE_LOCK(sc);
 1422 
 1423         count = 0;
 1424         buf = outbuf;
 1425         len = min(bac->ifbac_len, buflen);
 1426         bzero(&bareq, sizeof(bareq));
 1427         LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
 1428                 if (len < sizeof(bareq))
 1429                         goto out;
 1430                 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
 1431                     sizeof(bareq.ifba_ifsname));
 1432                 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
 1433                 bareq.ifba_vlan = brt->brt_vlan;
 1434                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
 1435                                 time_uptime < brt->brt_expire)
 1436                         bareq.ifba_expire = brt->brt_expire - time_uptime;
 1437                 else
 1438                         bareq.ifba_expire = 0;
 1439                 bareq.ifba_flags = brt->brt_flags;
 1440 
 1441                 memcpy(buf, &bareq, sizeof(bareq));
 1442                 count++;
 1443                 buf += sizeof(bareq);
 1444                 len -= sizeof(bareq);
 1445         }
 1446 out:
 1447         BRIDGE_UNLOCK(sc);
 1448         bac->ifbac_len = sizeof(bareq) * count;
 1449         error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
 1450         BRIDGE_LOCK(sc);
 1451         free(outbuf, M_TEMP);
 1452         return (error);
 1453 }
 1454 
 1455 static int
 1456 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
 1457 {
 1458         struct ifbareq *req = arg;
 1459         struct bridge_iflist *bif;
 1460         int error;
 1461 
 1462         bif = bridge_lookup_member(sc, req->ifba_ifsname);
 1463         if (bif == NULL)
 1464                 return (ENOENT);
 1465 
 1466         error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
 1467             req->ifba_flags);
 1468 
 1469         return (error);
 1470 }
 1471 
 1472 static int
 1473 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
 1474 {
 1475         struct ifbrparam *param = arg;
 1476 
 1477         sc->sc_brttimeout = param->ifbrp_ctime;
 1478         return (0);
 1479 }
 1480 
 1481 static int
 1482 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
 1483 {
 1484         struct ifbrparam *param = arg;
 1485 
 1486         param->ifbrp_ctime = sc->sc_brttimeout;
 1487         return (0);
 1488 }
 1489 
 1490 static int
 1491 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
 1492 {
 1493         struct ifbareq *req = arg;
 1494 
 1495         return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
 1496 }
 1497 
 1498 static int
 1499 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
 1500 {
 1501         struct ifbreq *req = arg;
 1502 
 1503         bridge_rtflush(sc, req->ifbr_ifsflags);
 1504         return (0);
 1505 }
 1506 
 1507 static int
 1508 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
 1509 {
 1510         struct ifbrparam *param = arg;
 1511         struct bstp_state *bs = &sc->sc_stp;
 1512 
 1513         param->ifbrp_prio = bs->bs_bridge_priority;
 1514         return (0);
 1515 }
 1516 
 1517 static int
 1518 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
 1519 {
 1520         struct ifbrparam *param = arg;
 1521 
 1522         return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
 1523 }
 1524 
 1525 static int
 1526 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
 1527 {
 1528         struct ifbrparam *param = arg;
 1529         struct bstp_state *bs = &sc->sc_stp;
 1530 
 1531         param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
 1532         return (0);
 1533 }
 1534 
 1535 static int
 1536 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
 1537 {
 1538         struct ifbrparam *param = arg;
 1539 
 1540         return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
 1541 }
 1542 
 1543 static int
 1544 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
 1545 {
 1546         struct ifbrparam *param = arg;
 1547         struct bstp_state *bs = &sc->sc_stp;
 1548 
 1549         param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
 1550         return (0);
 1551 }
 1552 
 1553 static int
 1554 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
 1555 {
 1556         struct ifbrparam *param = arg;
 1557 
 1558         return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
 1559 }
 1560 
 1561 static int
 1562 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
 1563 {
 1564         struct ifbrparam *param = arg;
 1565         struct bstp_state *bs = &sc->sc_stp;
 1566 
 1567         param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
 1568         return (0);
 1569 }
 1570 
 1571 static int
 1572 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
 1573 {
 1574         struct ifbrparam *param = arg;
 1575 
 1576         return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
 1577 }
 1578 
 1579 static int
 1580 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
 1581 {
 1582         struct ifbreq *req = arg;
 1583         struct bridge_iflist *bif;
 1584 
 1585         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
 1586         if (bif == NULL)
 1587                 return (ENOENT);
 1588 
 1589         return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
 1590 }
 1591 
 1592 static int
 1593 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
 1594 {
 1595         struct ifbreq *req = arg;
 1596         struct bridge_iflist *bif;
 1597 
 1598         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
 1599         if (bif == NULL)
 1600                 return (ENOENT);
 1601 
 1602         return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
 1603 }
 1604 
 1605 static int
 1606 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
 1607 {
 1608         struct ifbreq *req = arg;
 1609         struct bridge_iflist *bif;
 1610 
 1611         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
 1612         if (bif == NULL)
 1613                 return (ENOENT);
 1614 
 1615         bif->bif_addrmax = req->ifbr_addrmax;
 1616         return (0);
 1617 }
 1618 
 1619 static int
 1620 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
 1621 {
 1622         struct ifbreq *req = arg;
 1623         struct bridge_iflist *bif = NULL;
 1624         struct ifnet *ifs;
 1625 
 1626         ifs = ifunit(req->ifbr_ifsname);
 1627         if (ifs == NULL)
 1628                 return (ENOENT);
 1629 
 1630         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
 1631                 if (ifs == bif->bif_ifp)
 1632                         return (EBUSY);
 1633 
 1634         if (ifs->if_bridge != NULL)
 1635                 return (EBUSY);
 1636 
 1637         switch (ifs->if_type) {
 1638                 case IFT_ETHER:
 1639                 case IFT_GIF:
 1640                 case IFT_L2VLAN:
 1641                         break;
 1642                 default:
 1643                         return (EINVAL);
 1644         }
 1645 
 1646         bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
 1647         if (bif == NULL)
 1648                 return (ENOMEM);
 1649 
 1650         bif->bif_ifp = ifs;
 1651         bif->bif_flags = IFBIF_SPAN;
 1652 
 1653         LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
 1654 
 1655         return (0);
 1656 }
 1657 
 1658 static int
 1659 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
 1660 {
 1661         struct ifbreq *req = arg;
 1662         struct bridge_iflist *bif;
 1663         struct ifnet *ifs;
 1664 
 1665         ifs = ifunit(req->ifbr_ifsname);
 1666         if (ifs == NULL)
 1667                 return (ENOENT);
 1668 
 1669         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
 1670                 if (ifs == bif->bif_ifp)
 1671                         break;
 1672 
 1673         if (bif == NULL)
 1674                 return (ENOENT);
 1675 
 1676         bridge_delete_span(sc, bif);
 1677 
 1678         return (0);
 1679 }
 1680 
 1681 static int
 1682 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
 1683 {
 1684         struct ifbropreq *req = arg;
 1685         struct bstp_state *bs = &sc->sc_stp;
 1686         struct bstp_port *root_port;
 1687 
 1688         req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
 1689         req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
 1690         req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
 1691 
 1692         root_port = bs->bs_root_port;
 1693         if (root_port == NULL)
 1694                 req->ifbop_root_port = 0;
 1695         else
 1696                 req->ifbop_root_port = root_port->bp_ifp->if_index;
 1697 
 1698         req->ifbop_holdcount = bs->bs_txholdcount;
 1699         req->ifbop_priority = bs->bs_bridge_priority;
 1700         req->ifbop_protocol = bs->bs_protover;
 1701         req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
 1702         req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
 1703         req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
 1704         req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
 1705         req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
 1706         req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
 1707 
 1708         return (0);
 1709 }
 1710 
 1711 static int
 1712 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
 1713 {
 1714         struct ifbrparam *param = arg;
 1715 
 1716         param->ifbrp_cexceeded = sc->sc_brtexceeded;
 1717         return (0);
 1718 }
 1719 
 1720 static int
 1721 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
 1722 {
 1723         struct ifbpstpconf *bifstp = arg;
 1724         struct bridge_iflist *bif;
 1725         struct bstp_port *bp;
 1726         struct ifbpstpreq bpreq;
 1727         char *buf, *outbuf;
 1728         int count, buflen, len, error = 0;
 1729 
 1730         count = 0;
 1731         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 1732                 if ((bif->bif_flags & IFBIF_STP) != 0)
 1733                         count++;
 1734         }
 1735 
 1736         buflen = sizeof(bpreq) * count;
 1737         if (bifstp->ifbpstp_len == 0) {
 1738                 bifstp->ifbpstp_len = buflen;
 1739                 return (0);
 1740         }
 1741 
 1742         BRIDGE_UNLOCK(sc);
 1743         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
 1744         BRIDGE_LOCK(sc);
 1745 
 1746         count = 0;
 1747         buf = outbuf;
 1748         len = min(bifstp->ifbpstp_len, buflen);
 1749         bzero(&bpreq, sizeof(bpreq));
 1750         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 1751                 if (len < sizeof(bpreq))
 1752                         break;
 1753 
 1754                 if ((bif->bif_flags & IFBIF_STP) == 0)
 1755                         continue;
 1756 
 1757                 bp = &bif->bif_stp;
 1758                 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
 1759                 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
 1760                 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
 1761                 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
 1762                 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
 1763                 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
 1764 
 1765                 memcpy(buf, &bpreq, sizeof(bpreq));
 1766                 count++;
 1767                 buf += sizeof(bpreq);
 1768                 len -= sizeof(bpreq);
 1769         }
 1770 
 1771         BRIDGE_UNLOCK(sc);
 1772         bifstp->ifbpstp_len = sizeof(bpreq) * count;
 1773         error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
 1774         BRIDGE_LOCK(sc);
 1775         free(outbuf, M_TEMP);
 1776         return (error);
 1777 }
 1778 
 1779 static int
 1780 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
 1781 {
 1782         struct ifbrparam *param = arg;
 1783 
 1784         return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
 1785 }
 1786 
 1787 static int
 1788 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
 1789 {
 1790         struct ifbrparam *param = arg;
 1791 
 1792         return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
 1793 }
 1794 
 1795 /*
 1796  * bridge_ifdetach:
 1797  *
 1798  *      Detach an interface from a bridge.  Called when a member
 1799  *      interface is detaching.
 1800  */
 1801 static void
 1802 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
 1803 {
 1804         struct bridge_softc *sc = ifp->if_bridge;
 1805         struct bridge_iflist *bif;
 1806 
 1807         if (ifp->if_flags & IFF_RENAMING)
 1808                 return;
 1809         if (V_bridge_cloner == NULL) {
 1810                 /*
 1811                  * This detach handler can be called after
 1812                  * vnet_bridge_uninit().  Just return in that case.
 1813                  */
 1814                 return;
 1815         }
 1816         /* Check if the interface is a bridge member */
 1817         if (sc != NULL) {
 1818                 BRIDGE_LOCK(sc);
 1819 
 1820                 bif = bridge_lookup_member_if(sc, ifp);
 1821                 if (bif != NULL)
 1822                         bridge_delete_member(sc, bif, 1);
 1823 
 1824                 BRIDGE_UNLOCK(sc);
 1825                 return;
 1826         }
 1827 
 1828         /* Check if the interface is a span port */
 1829         BRIDGE_LIST_LOCK();
 1830         LIST_FOREACH(sc, &V_bridge_list, sc_list) {
 1831                 BRIDGE_LOCK(sc);
 1832                 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
 1833                         if (ifp == bif->bif_ifp) {
 1834                                 bridge_delete_span(sc, bif);
 1835                                 break;
 1836                         }
 1837 
 1838                 BRIDGE_UNLOCK(sc);
 1839         }
 1840         BRIDGE_LIST_UNLOCK();
 1841 }
 1842 
 1843 /*
 1844  * bridge_init:
 1845  *
 1846  *      Initialize a bridge interface.
 1847  */
 1848 static void
 1849 bridge_init(void *xsc)
 1850 {
 1851         struct bridge_softc *sc = (struct bridge_softc *)xsc;
 1852         struct ifnet *ifp = sc->sc_ifp;
 1853 
 1854         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
 1855                 return;
 1856 
 1857         BRIDGE_LOCK(sc);
 1858         callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
 1859             bridge_timer, sc);
 1860 
 1861         ifp->if_drv_flags |= IFF_DRV_RUNNING;
 1862         bstp_init(&sc->sc_stp);         /* Initialize Spanning Tree */
 1863 
 1864         BRIDGE_UNLOCK(sc);
 1865 }
 1866 
 1867 /*
 1868  * bridge_stop:
 1869  *
 1870  *      Stop the bridge interface.
 1871  */
 1872 static void
 1873 bridge_stop(struct ifnet *ifp, int disable)
 1874 {
 1875         struct bridge_softc *sc = ifp->if_softc;
 1876 
 1877         BRIDGE_LOCK_ASSERT(sc);
 1878 
 1879         if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
 1880                 return;
 1881 
 1882         callout_stop(&sc->sc_brcallout);
 1883         bstp_stop(&sc->sc_stp);
 1884 
 1885         bridge_rtflush(sc, IFBF_FLUSHDYN);
 1886 
 1887         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
 1888 }
 1889 
 1890 /*
 1891  * bridge_enqueue:
 1892  *
 1893  *      Enqueue a packet on a bridge member interface.
 1894  *
 1895  */
 1896 static int
 1897 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
 1898 {
 1899         int len, err = 0;
 1900         short mflags;
 1901         struct mbuf *m0;
 1902 
 1903         /* We may be sending a fragment so traverse the mbuf */
 1904         for (; m; m = m0) {
 1905                 m0 = m->m_nextpkt;
 1906                 m->m_nextpkt = NULL;
 1907                 len = m->m_pkthdr.len;
 1908                 mflags = m->m_flags;
 1909 
 1910                 /*
 1911                  * If underlying interface can not do VLAN tag insertion itself
 1912                  * then attach a packet tag that holds it.
 1913                  */
 1914                 if ((m->m_flags & M_VLANTAG) &&
 1915                     (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
 1916                         m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
 1917                         if (m == NULL) {
 1918                                 if_printf(dst_ifp,
 1919                                     "unable to prepend VLAN header\n");
 1920                                 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1);
 1921                                 continue;
 1922                         }
 1923                         m->m_flags &= ~M_VLANTAG;
 1924                 }
 1925 
 1926                 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */
 1927                 if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
 1928                         m_freem(m0);
 1929                         if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
 1930                         break;
 1931                 }
 1932 
 1933                 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1);
 1934                 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len);
 1935                 if (mflags & M_MCAST)
 1936                         if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1);
 1937         }
 1938 
 1939         return (err);
 1940 }
 1941 
 1942 /*
 1943  * bridge_dummynet:
 1944  *
 1945  *      Receive a queued packet from dummynet and pass it on to the output
 1946  *      interface.
 1947  *
 1948  *      The mbuf has the Ethernet header already attached.
 1949  */
 1950 static void
 1951 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
 1952 {
 1953         struct bridge_softc *sc;
 1954 
 1955         sc = ifp->if_bridge;
 1956 
 1957         /*
 1958          * The packet didnt originate from a member interface. This should only
 1959          * ever happen if a member interface is removed while packets are
 1960          * queued for it.
 1961          */
 1962         if (sc == NULL) {
 1963                 m_freem(m);
 1964                 return;
 1965         }
 1966 
 1967         if (PFIL_HOOKED(&V_inet_pfil_hook)
 1968 #ifdef INET6
 1969             || PFIL_HOOKED(&V_inet6_pfil_hook)
 1970 #endif
 1971             ) {
 1972                 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
 1973                         return;
 1974                 if (m == NULL)
 1975                         return;
 1976         }
 1977 
 1978         bridge_enqueue(sc, ifp, m);
 1979 }
 1980 
 1981 /*
 1982  * bridge_output:
 1983  *
 1984  *      Send output from a bridge member interface.  This
 1985  *      performs the bridging function for locally originated
 1986  *      packets.
 1987  *
 1988  *      The mbuf has the Ethernet header already attached.  We must
 1989  *      enqueue or free the mbuf before returning.
 1990  */
 1991 static int
 1992 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
 1993     struct rtentry *rt)
 1994 {
 1995         struct ether_header *eh;
 1996         struct ifnet *dst_if;
 1997         struct bridge_softc *sc;
 1998         uint16_t vlan;
 1999 
 2000         if (m->m_len < ETHER_HDR_LEN) {
 2001                 m = m_pullup(m, ETHER_HDR_LEN);
 2002                 if (m == NULL)
 2003                         return (0);
 2004         }
 2005 
 2006         eh = mtod(m, struct ether_header *);
 2007         sc = ifp->if_bridge;
 2008         vlan = VLANTAGOF(m);
 2009 
 2010         BRIDGE_LOCK(sc);
 2011 
 2012         /*
 2013          * If bridge is down, but the original output interface is up,
 2014          * go ahead and send out that interface.  Otherwise, the packet
 2015          * is dropped below.
 2016          */
 2017         if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
 2018                 dst_if = ifp;
 2019                 goto sendunicast;
 2020         }
 2021 
 2022         /*
 2023          * If the packet is a multicast, or we don't know a better way to
 2024          * get there, send to all interfaces.
 2025          */
 2026         if (ETHER_IS_MULTICAST(eh->ether_dhost))
 2027                 dst_if = NULL;
 2028         else
 2029                 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
 2030         if (dst_if == NULL) {
 2031                 struct bridge_iflist *bif;
 2032                 struct mbuf *mc;
 2033                 int error = 0, used = 0;
 2034 
 2035                 bridge_span(sc, m);
 2036 
 2037                 BRIDGE_LOCK2REF(sc, error);
 2038                 if (error) {
 2039                         m_freem(m);
 2040                         return (0);
 2041                 }
 2042 
 2043                 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 2044                         dst_if = bif->bif_ifp;
 2045 
 2046                         if (dst_if->if_type == IFT_GIF)
 2047                                 continue;
 2048                         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
 2049                                 continue;
 2050 
 2051                         /*
 2052                          * If this is not the original output interface,
 2053                          * and the interface is participating in spanning
 2054                          * tree, make sure the port is in a state that
 2055                          * allows forwarding.
 2056                          */
 2057                         if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
 2058                             bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
 2059                                 continue;
 2060 
 2061                         if (LIST_NEXT(bif, bif_next) == NULL) {
 2062                                 used = 1;
 2063                                 mc = m;
 2064                         } else {
 2065                                 mc = m_copypacket(m, M_NOWAIT);
 2066                                 if (mc == NULL) {
 2067                                         if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
 2068                                         continue;
 2069                                 }
 2070                         }
 2071 
 2072                         bridge_enqueue(sc, dst_if, mc);
 2073                 }
 2074                 if (used == 0)
 2075                         m_freem(m);
 2076                 BRIDGE_UNREF(sc);
 2077                 return (0);
 2078         }
 2079 
 2080 sendunicast:
 2081         /*
 2082          * XXX Spanning tree consideration here?
 2083          */
 2084 
 2085         bridge_span(sc, m);
 2086         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
 2087                 m_freem(m);
 2088                 BRIDGE_UNLOCK(sc);
 2089                 return (0);
 2090         }
 2091 
 2092         BRIDGE_UNLOCK(sc);
 2093         bridge_enqueue(sc, dst_if, m);
 2094         return (0);
 2095 }
 2096 
 2097 /*
 2098  * bridge_transmit:
 2099  *
 2100  *      Do output on a bridge.
 2101  *
 2102  */
 2103 static int
 2104 bridge_transmit(struct ifnet *ifp, struct mbuf *m)
 2105 {
 2106         struct bridge_softc *sc;
 2107         struct ether_header *eh;
 2108         struct ifnet *dst_if;
 2109         int error = 0;
 2110 
 2111         sc = ifp->if_softc;
 2112 
 2113         ETHER_BPF_MTAP(ifp, m);
 2114 
 2115         eh = mtod(m, struct ether_header *);
 2116 
 2117         BRIDGE_LOCK(sc);
 2118         if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) &&
 2119             (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) {
 2120                 BRIDGE_UNLOCK(sc);
 2121                 error = bridge_enqueue(sc, dst_if, m);
 2122         } else
 2123                 bridge_broadcast(sc, ifp, m, 0);
 2124 
 2125         return (error);
 2126 }
 2127 
 2128 /*
 2129  * The ifp->if_qflush entry point for if_bridge(4) is no-op.
 2130  */
 2131 static void
 2132 bridge_qflush(struct ifnet *ifp __unused)
 2133 {
 2134 }
 2135 
 2136 /*
 2137  * bridge_forward:
 2138  *
 2139  *      The forwarding function of the bridge.
 2140  *
 2141  *      NOTE: Releases the lock on return.
 2142  */
 2143 static void
 2144 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
 2145     struct mbuf *m)
 2146 {
 2147         struct bridge_iflist *dbif;
 2148         struct ifnet *src_if, *dst_if, *ifp;
 2149         struct ether_header *eh;
 2150         uint16_t vlan;
 2151         uint8_t *dst;
 2152         int error;
 2153 
 2154         src_if = m->m_pkthdr.rcvif;
 2155         ifp = sc->sc_ifp;
 2156 
 2157         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
 2158         if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
 2159         vlan = VLANTAGOF(m);
 2160 
 2161         if ((sbif->bif_flags & IFBIF_STP) &&
 2162             sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
 2163                 goto drop;
 2164 
 2165         eh = mtod(m, struct ether_header *);
 2166         dst = eh->ether_dhost;
 2167 
 2168         /* If the interface is learning, record the address. */
 2169         if (sbif->bif_flags & IFBIF_LEARNING) {
 2170                 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
 2171                     sbif, 0, IFBAF_DYNAMIC);
 2172                 /*
 2173                  * If the interface has addresses limits then deny any source
 2174                  * that is not in the cache.
 2175                  */
 2176                 if (error && sbif->bif_addrmax)
 2177                         goto drop;
 2178         }
 2179 
 2180         if ((sbif->bif_flags & IFBIF_STP) != 0 &&
 2181             sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
 2182                 goto drop;
 2183 
 2184         /*
 2185          * At this point, the port either doesn't participate
 2186          * in spanning tree or it is in the forwarding state.
 2187          */
 2188 
 2189         /*
 2190          * If the packet is unicast, destined for someone on
 2191          * "this" side of the bridge, drop it.
 2192          */
 2193         if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
 2194                 dst_if = bridge_rtlookup(sc, dst, vlan);
 2195                 if (src_if == dst_if)
 2196                         goto drop;
 2197         } else {
 2198                 /*
 2199                  * Check if its a reserved multicast address, any address
 2200                  * listed in 802.1D section 7.12.6 may not be forwarded by the
 2201                  * bridge.
 2202                  * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
 2203                  */
 2204                 if (dst[0] == 0x01 && dst[1] == 0x80 &&
 2205                     dst[2] == 0xc2 && dst[3] == 0x00 &&
 2206                     dst[4] == 0x00 && dst[5] <= 0x0f)
 2207                         goto drop;
 2208 
 2209                 /* ...forward it to all interfaces. */
 2210                 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
 2211                 dst_if = NULL;
 2212         }
 2213 
 2214         /*
 2215          * If we have a destination interface which is a member of our bridge,
 2216          * OR this is a unicast packet, push it through the bpf(4) machinery.
 2217          * For broadcast or multicast packets, don't bother because it will
 2218          * be reinjected into ether_input. We do this before we pass the packets
 2219          * through the pfil(9) framework, as it is possible that pfil(9) will
 2220          * drop the packet, or possibly modify it, making it difficult to debug
 2221          * firewall issues on the bridge.
 2222          */
 2223         if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
 2224                 ETHER_BPF_MTAP(ifp, m);
 2225 
 2226         /* run the packet filter */
 2227         if (PFIL_HOOKED(&V_inet_pfil_hook)
 2228 #ifdef INET6
 2229             || PFIL_HOOKED(&V_inet6_pfil_hook)
 2230 #endif
 2231             ) {
 2232                 BRIDGE_UNLOCK(sc);
 2233                 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
 2234                         return;
 2235                 if (m == NULL)
 2236                         return;
 2237                 BRIDGE_LOCK(sc);
 2238         }
 2239 
 2240         if (dst_if == NULL) {
 2241                 bridge_broadcast(sc, src_if, m, 1);
 2242                 return;
 2243         }
 2244 
 2245         /*
 2246          * At this point, we're dealing with a unicast frame
 2247          * going to a different interface.
 2248          */
 2249         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
 2250                 goto drop;
 2251 
 2252         dbif = bridge_lookup_member_if(sc, dst_if);
 2253         if (dbif == NULL)
 2254                 /* Not a member of the bridge (anymore?) */
 2255                 goto drop;
 2256 
 2257         /* Private segments can not talk to each other */
 2258         if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
 2259                 goto drop;
 2260 
 2261         if ((dbif->bif_flags & IFBIF_STP) &&
 2262             dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
 2263                 goto drop;
 2264 
 2265         BRIDGE_UNLOCK(sc);
 2266 
 2267         if (PFIL_HOOKED(&V_inet_pfil_hook)
 2268 #ifdef INET6
 2269             || PFIL_HOOKED(&V_inet6_pfil_hook)
 2270 #endif
 2271             ) {
 2272                 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
 2273                         return;
 2274                 if (m == NULL)
 2275                         return;
 2276         }
 2277 
 2278         bridge_enqueue(sc, dst_if, m);
 2279         return;
 2280 
 2281 drop:
 2282         BRIDGE_UNLOCK(sc);
 2283         m_freem(m);
 2284 }
 2285 
 2286 /*
 2287  * bridge_input:
 2288  *
 2289  *      Receive input from a member interface.  Queue the packet for
 2290  *      bridging if it is not for us.
 2291  */
 2292 static struct mbuf *
 2293 bridge_input(struct ifnet *ifp, struct mbuf *m)
 2294 {
 2295         struct bridge_softc *sc = ifp->if_bridge;
 2296         struct bridge_iflist *bif, *bif2;
 2297         struct ifnet *bifp;
 2298         struct ether_header *eh;
 2299         struct mbuf *mc, *mc2;
 2300         uint16_t vlan;
 2301         int error;
 2302 
 2303         if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
 2304                 return (m);
 2305 
 2306         bifp = sc->sc_ifp;
 2307         vlan = VLANTAGOF(m);
 2308 
 2309         /*
 2310          * Implement support for bridge monitoring. If this flag has been
 2311          * set on this interface, discard the packet once we push it through
 2312          * the bpf(4) machinery, but before we do, increment the byte and
 2313          * packet counters associated with this interface.
 2314          */
 2315         if ((bifp->if_flags & IFF_MONITOR) != 0) {
 2316                 m->m_pkthdr.rcvif  = bifp;
 2317                 ETHER_BPF_MTAP(bifp, m);
 2318                 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1);
 2319                 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
 2320                 m_freem(m);
 2321                 return (NULL);
 2322         }
 2323         BRIDGE_LOCK(sc);
 2324         bif = bridge_lookup_member_if(sc, ifp);
 2325         if (bif == NULL) {
 2326                 BRIDGE_UNLOCK(sc);
 2327                 return (m);
 2328         }
 2329 
 2330         eh = mtod(m, struct ether_header *);
 2331 
 2332         bridge_span(sc, m);
 2333 
 2334         if (m->m_flags & (M_BCAST|M_MCAST)) {
 2335                 /* Tap off 802.1D packets; they do not get forwarded. */
 2336                 if (memcmp(eh->ether_dhost, bstp_etheraddr,
 2337                     ETHER_ADDR_LEN) == 0) {
 2338                         bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
 2339                         BRIDGE_UNLOCK(sc);
 2340                         return (NULL);
 2341                 }
 2342 
 2343                 if ((bif->bif_flags & IFBIF_STP) &&
 2344                     bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
 2345                         BRIDGE_UNLOCK(sc);
 2346                         return (m);
 2347                 }
 2348 
 2349                 /*
 2350                  * Make a deep copy of the packet and enqueue the copy
 2351                  * for bridge processing; return the original packet for
 2352                  * local processing.
 2353                  */
 2354                 mc = m_dup(m, M_NOWAIT);
 2355                 if (mc == NULL) {
 2356                         BRIDGE_UNLOCK(sc);
 2357                         return (m);
 2358                 }
 2359 
 2360                 /* Perform the bridge forwarding function with the copy. */
 2361                 bridge_forward(sc, bif, mc);
 2362 
 2363                 /*
 2364                  * Reinject the mbuf as arriving on the bridge so we have a
 2365                  * chance at claiming multicast packets. We can not loop back
 2366                  * here from ether_input as a bridge is never a member of a
 2367                  * bridge.
 2368                  */
 2369                 KASSERT(bifp->if_bridge == NULL,
 2370                     ("loop created in bridge_input"));
 2371                 mc2 = m_dup(m, M_NOWAIT);
 2372                 if (mc2 != NULL) {
 2373                         /* Keep the layer3 header aligned */
 2374                         int i = min(mc2->m_pkthdr.len, max_protohdr);
 2375                         mc2 = m_copyup(mc2, i, ETHER_ALIGN);
 2376                 }
 2377                 if (mc2 != NULL) {
 2378                         mc2->m_pkthdr.rcvif = bifp;
 2379                         (*bifp->if_input)(bifp, mc2);
 2380                 }
 2381 
 2382                 /* Return the original packet for local processing. */
 2383                 return (m);
 2384         }
 2385 
 2386         if ((bif->bif_flags & IFBIF_STP) &&
 2387             bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
 2388                 BRIDGE_UNLOCK(sc);
 2389                 return (m);
 2390         }
 2391 
 2392 #if (defined(INET) || defined(INET6))
 2393 #   define OR_CARP_CHECK_WE_ARE_DST(iface) \
 2394         || ((iface)->if_carp \
 2395             && (*carp_forus_p)((iface), eh->ether_dhost))
 2396 #   define OR_CARP_CHECK_WE_ARE_SRC(iface) \
 2397         || ((iface)->if_carp \
 2398             && (*carp_forus_p)((iface), eh->ether_shost))
 2399 #else
 2400 #   define OR_CARP_CHECK_WE_ARE_DST(iface)
 2401 #   define OR_CARP_CHECK_WE_ARE_SRC(iface)
 2402 #endif
 2403 
 2404 #ifdef INET6
 2405 #   define OR_PFIL_HOOKED_INET6 \
 2406         || PFIL_HOOKED(&V_inet6_pfil_hook)
 2407 #else
 2408 #   define OR_PFIL_HOOKED_INET6
 2409 #endif
 2410 
 2411 #define GRAB_OUR_PACKETS(iface) \
 2412         if ((iface)->if_type == IFT_GIF) \
 2413                 continue; \
 2414         /* It is destined for us. */ \
 2415         if (memcmp(IF_LLADDR((iface)), eh->ether_dhost,  ETHER_ADDR_LEN) == 0 \
 2416             OR_CARP_CHECK_WE_ARE_DST((iface))                           \
 2417             ) {                                                         \
 2418                 if ((iface)->if_type == IFT_BRIDGE) {                   \
 2419                         ETHER_BPF_MTAP(iface, m);                       \
 2420                         if_inc_counter(iface, IFCOUNTER_IPACKETS, 1);                           \
 2421                         if_inc_counter(iface, IFCOUNTER_IBYTES, m->m_pkthdr.len);               \
 2422                         /* Filter on the physical interface. */         \
 2423                         if (V_pfil_local_phys &&                        \
 2424                             (PFIL_HOOKED(&V_inet_pfil_hook)             \
 2425                              OR_PFIL_HOOKED_INET6)) {                   \
 2426                                 if (bridge_pfil(&m, NULL, ifp,          \
 2427                                     PFIL_IN) != 0 || m == NULL) {       \
 2428                                         BRIDGE_UNLOCK(sc);              \
 2429                                         return (NULL);                  \
 2430                                 }                                       \
 2431                                 eh = mtod(m, struct ether_header *);    \
 2432                         }                                               \
 2433                 }                                                       \
 2434                 if (bif->bif_flags & IFBIF_LEARNING) {                  \
 2435                         error = bridge_rtupdate(sc, eh->ether_shost,    \
 2436                             vlan, bif, 0, IFBAF_DYNAMIC);               \
 2437                         if (error && bif->bif_addrmax) {                \
 2438                                 BRIDGE_UNLOCK(sc);                      \
 2439                                 m_freem(m);                             \
 2440                                 return (NULL);                          \
 2441                         }                                               \
 2442                 }                                                       \
 2443                 m->m_pkthdr.rcvif = iface;                              \
 2444                 BRIDGE_UNLOCK(sc);                                      \
 2445                 return (m);                                             \
 2446         }                                                               \
 2447                                                                         \
 2448         /* We just received a packet that we sent out. */               \
 2449         if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
 2450             OR_CARP_CHECK_WE_ARE_SRC((iface))                   \
 2451             ) {                                                         \
 2452                 BRIDGE_UNLOCK(sc);                                      \
 2453                 m_freem(m);                                             \
 2454                 return (NULL);                                          \
 2455         }
 2456 
 2457         /*
 2458          * Unicast.  Make sure it's not for the bridge.
 2459          */
 2460         do { GRAB_OUR_PACKETS(bifp) } while (0);
 2461 
 2462         /*
 2463          * Give a chance for ifp at first priority. This will help when the
 2464          * packet comes through the interface like VLAN's with the same MACs
 2465          * on several interfaces from the same bridge. This also will save
 2466          * some CPU cycles in case the destination interface and the input
 2467          * interface (eq ifp) are the same.
 2468          */
 2469         do { GRAB_OUR_PACKETS(ifp) } while (0);
 2470 
 2471         /* Now check the all bridge members. */
 2472         LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
 2473                 GRAB_OUR_PACKETS(bif2->bif_ifp)
 2474         }
 2475 
 2476 #undef OR_CARP_CHECK_WE_ARE_DST
 2477 #undef OR_CARP_CHECK_WE_ARE_SRC
 2478 #undef OR_PFIL_HOOKED_INET6
 2479 #undef GRAB_OUR_PACKETS
 2480 
 2481         /* Perform the bridge forwarding function. */
 2482         bridge_forward(sc, bif, m);
 2483 
 2484         return (NULL);
 2485 }
 2486 
 2487 /*
 2488  * bridge_broadcast:
 2489  *
 2490  *      Send a frame to all interfaces that are members of
 2491  *      the bridge, except for the one on which the packet
 2492  *      arrived.
 2493  *
 2494  *      NOTE: Releases the lock on return.
 2495  */
 2496 static void
 2497 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
 2498     struct mbuf *m, int runfilt)
 2499 {
 2500         struct bridge_iflist *dbif, *sbif;
 2501         struct mbuf *mc;
 2502         struct ifnet *dst_if;
 2503         int error = 0, used = 0, i;
 2504 
 2505         sbif = bridge_lookup_member_if(sc, src_if);
 2506 
 2507         BRIDGE_LOCK2REF(sc, error);
 2508         if (error) {
 2509                 m_freem(m);
 2510                 return;
 2511         }
 2512 
 2513         /* Filter on the bridge interface before broadcasting */
 2514         if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
 2515 #ifdef INET6
 2516             || PFIL_HOOKED(&V_inet6_pfil_hook)
 2517 #endif
 2518             )) {
 2519                 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
 2520                         goto out;
 2521                 if (m == NULL)
 2522                         goto out;
 2523         }
 2524 
 2525         LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
 2526                 dst_if = dbif->bif_ifp;
 2527                 if (dst_if == src_if)
 2528                         continue;
 2529 
 2530                 /* Private segments can not talk to each other */
 2531                 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
 2532                         continue;
 2533 
 2534                 if ((dbif->bif_flags & IFBIF_STP) &&
 2535                     dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
 2536                         continue;
 2537 
 2538                 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
 2539                     (m->m_flags & (M_BCAST|M_MCAST)) == 0)
 2540                         continue;
 2541 
 2542                 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
 2543                         continue;
 2544 
 2545                 if (LIST_NEXT(dbif, bif_next) == NULL) {
 2546                         mc = m;
 2547                         used = 1;
 2548                 } else {
 2549                         mc = m_dup(m, M_NOWAIT);
 2550                         if (mc == NULL) {
 2551                                 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
 2552                                 continue;
 2553                         }
 2554                 }
 2555 
 2556                 /*
 2557                  * Filter on the output interface. Pass a NULL bridge interface
 2558                  * pointer so we do not redundantly filter on the bridge for
 2559                  * each interface we broadcast on.
 2560                  */
 2561                 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
 2562 #ifdef INET6
 2563                     || PFIL_HOOKED(&V_inet6_pfil_hook)
 2564 #endif
 2565                     )) {
 2566                         if (used == 0) {
 2567                                 /* Keep the layer3 header aligned */
 2568                                 i = min(mc->m_pkthdr.len, max_protohdr);
 2569                                 mc = m_copyup(mc, i, ETHER_ALIGN);
 2570                                 if (mc == NULL) {
 2571                                         if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
 2572                                         continue;
 2573                                 }
 2574                         }
 2575                         if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
 2576                                 continue;
 2577                         if (mc == NULL)
 2578                                 continue;
 2579                 }
 2580 
 2581                 bridge_enqueue(sc, dst_if, mc);
 2582         }
 2583         if (used == 0)
 2584                 m_freem(m);
 2585 
 2586 out:
 2587         BRIDGE_UNREF(sc);
 2588 }
 2589 
 2590 /*
 2591  * bridge_span:
 2592  *
 2593  *      Duplicate a packet out one or more interfaces that are in span mode,
 2594  *      the original mbuf is unmodified.
 2595  */
 2596 static void
 2597 bridge_span(struct bridge_softc *sc, struct mbuf *m)
 2598 {
 2599         struct bridge_iflist *bif;
 2600         struct ifnet *dst_if;
 2601         struct mbuf *mc;
 2602 
 2603         if (LIST_EMPTY(&sc->sc_spanlist))
 2604                 return;
 2605 
 2606         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
 2607                 dst_if = bif->bif_ifp;
 2608 
 2609                 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
 2610                         continue;
 2611 
 2612                 mc = m_copypacket(m, M_NOWAIT);
 2613                 if (mc == NULL) {
 2614                         if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
 2615                         continue;
 2616                 }
 2617 
 2618                 bridge_enqueue(sc, dst_if, mc);
 2619         }
 2620 }
 2621 
 2622 /*
 2623  * bridge_rtupdate:
 2624  *
 2625  *      Add a bridge routing entry.
 2626  */
 2627 static int
 2628 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
 2629     struct bridge_iflist *bif, int setflags, uint8_t flags)
 2630 {
 2631         struct bridge_rtnode *brt;
 2632         int error;
 2633 
 2634         BRIDGE_LOCK_ASSERT(sc);
 2635 
 2636         /* Check the source address is valid and not multicast. */
 2637         if (ETHER_IS_MULTICAST(dst) ||
 2638             (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
 2639              dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
 2640                 return (EINVAL);
 2641 
 2642         /* 802.1p frames map to vlan 1 */
 2643         if (vlan == 0)
 2644                 vlan = 1;
 2645 
 2646         /*
 2647          * A route for this destination might already exist.  If so,
 2648          * update it, otherwise create a new one.
 2649          */
 2650         if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
 2651                 if (sc->sc_brtcnt >= sc->sc_brtmax) {
 2652                         sc->sc_brtexceeded++;
 2653                         return (ENOSPC);
 2654                 }
 2655                 /* Check per interface address limits (if enabled) */
 2656                 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
 2657                         bif->bif_addrexceeded++;
 2658                         return (ENOSPC);
 2659                 }
 2660 
 2661                 /*
 2662                  * Allocate a new bridge forwarding node, and
 2663                  * initialize the expiration time and Ethernet
 2664                  * address.
 2665                  */
 2666                 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO);
 2667                 if (brt == NULL)
 2668                         return (ENOMEM);
 2669 
 2670                 if (bif->bif_flags & IFBIF_STICKY)
 2671                         brt->brt_flags = IFBAF_STICKY;
 2672                 else
 2673                         brt->brt_flags = IFBAF_DYNAMIC;
 2674 
 2675                 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
 2676                 brt->brt_vlan = vlan;
 2677 
 2678                 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
 2679                         uma_zfree(bridge_rtnode_zone, brt);
 2680                         return (error);
 2681                 }
 2682                 brt->brt_dst = bif;
 2683                 bif->bif_addrcnt++;
 2684         }
 2685 
 2686         if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
 2687             brt->brt_dst != bif) {
 2688                 brt->brt_dst->bif_addrcnt--;
 2689                 brt->brt_dst = bif;
 2690                 brt->brt_dst->bif_addrcnt++;
 2691         }
 2692 
 2693         if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
 2694                 brt->brt_expire = time_uptime + sc->sc_brttimeout;
 2695         if (setflags)
 2696                 brt->brt_flags = flags;
 2697 
 2698         return (0);
 2699 }
 2700 
 2701 /*
 2702  * bridge_rtlookup:
 2703  *
 2704  *      Lookup the destination interface for an address.
 2705  */
 2706 static struct ifnet *
 2707 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
 2708 {
 2709         struct bridge_rtnode *brt;
 2710 
 2711         BRIDGE_LOCK_ASSERT(sc);
 2712 
 2713         if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
 2714                 return (NULL);
 2715 
 2716         return (brt->brt_ifp);
 2717 }
 2718 
 2719 /*
 2720  * bridge_rttrim:
 2721  *
 2722  *      Trim the routine table so that we have a number
 2723  *      of routing entries less than or equal to the
 2724  *      maximum number.
 2725  */
 2726 static void
 2727 bridge_rttrim(struct bridge_softc *sc)
 2728 {
 2729         struct bridge_rtnode *brt, *nbrt;
 2730 
 2731         BRIDGE_LOCK_ASSERT(sc);
 2732 
 2733         /* Make sure we actually need to do this. */
 2734         if (sc->sc_brtcnt <= sc->sc_brtmax)
 2735                 return;
 2736 
 2737         /* Force an aging cycle; this might trim enough addresses. */
 2738         bridge_rtage(sc);
 2739         if (sc->sc_brtcnt <= sc->sc_brtmax)
 2740                 return;
 2741 
 2742         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
 2743                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
 2744                         bridge_rtnode_destroy(sc, brt);
 2745                         if (sc->sc_brtcnt <= sc->sc_brtmax)
 2746                                 return;
 2747                 }
 2748         }
 2749 }
 2750 
 2751 /*
 2752  * bridge_timer:
 2753  *
 2754  *      Aging timer for the bridge.
 2755  */
 2756 static void
 2757 bridge_timer(void *arg)
 2758 {
 2759         struct bridge_softc *sc = arg;
 2760 
 2761         BRIDGE_LOCK_ASSERT(sc);
 2762 
 2763         bridge_rtage(sc);
 2764 
 2765         if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
 2766                 callout_reset(&sc->sc_brcallout,
 2767                     bridge_rtable_prune_period * hz, bridge_timer, sc);
 2768 }
 2769 
 2770 /*
 2771  * bridge_rtage:
 2772  *
 2773  *      Perform an aging cycle.
 2774  */
 2775 static void
 2776 bridge_rtage(struct bridge_softc *sc)
 2777 {
 2778         struct bridge_rtnode *brt, *nbrt;
 2779 
 2780         BRIDGE_LOCK_ASSERT(sc);
 2781 
 2782         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
 2783                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
 2784                         if (time_uptime >= brt->brt_expire)
 2785                                 bridge_rtnode_destroy(sc, brt);
 2786                 }
 2787         }
 2788 }
 2789 
 2790 /*
 2791  * bridge_rtflush:
 2792  *
 2793  *      Remove all dynamic addresses from the bridge.
 2794  */
 2795 static void
 2796 bridge_rtflush(struct bridge_softc *sc, int full)
 2797 {
 2798         struct bridge_rtnode *brt, *nbrt;
 2799 
 2800         BRIDGE_LOCK_ASSERT(sc);
 2801 
 2802         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
 2803                 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
 2804                         bridge_rtnode_destroy(sc, brt);
 2805         }
 2806 }
 2807 
 2808 /*
 2809  * bridge_rtdaddr:
 2810  *
 2811  *      Remove an address from the table.
 2812  */
 2813 static int
 2814 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
 2815 {
 2816         struct bridge_rtnode *brt;
 2817         int found = 0;
 2818 
 2819         BRIDGE_LOCK_ASSERT(sc);
 2820 
 2821         /*
 2822          * If vlan is zero then we want to delete for all vlans so the lookup
 2823          * may return more than one.
 2824          */
 2825         while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
 2826                 bridge_rtnode_destroy(sc, brt);
 2827                 found = 1;
 2828         }
 2829 
 2830         return (found ? 0 : ENOENT);
 2831 }
 2832 
 2833 /*
 2834  * bridge_rtdelete:
 2835  *
 2836  *      Delete routes to a speicifc member interface.
 2837  */
 2838 static void
 2839 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
 2840 {
 2841         struct bridge_rtnode *brt, *nbrt;
 2842 
 2843         BRIDGE_LOCK_ASSERT(sc);
 2844 
 2845         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
 2846                 if (brt->brt_ifp == ifp && (full ||
 2847                             (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
 2848                         bridge_rtnode_destroy(sc, brt);
 2849         }
 2850 }
 2851 
 2852 /*
 2853  * bridge_rtable_init:
 2854  *
 2855  *      Initialize the route table for this bridge.
 2856  */
 2857 static void
 2858 bridge_rtable_init(struct bridge_softc *sc)
 2859 {
 2860         int i;
 2861 
 2862         sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
 2863             M_DEVBUF, M_WAITOK);
 2864 
 2865         for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
 2866                 LIST_INIT(&sc->sc_rthash[i]);
 2867 
 2868         sc->sc_rthash_key = arc4random();
 2869         LIST_INIT(&sc->sc_rtlist);
 2870 }
 2871 
 2872 /*
 2873  * bridge_rtable_fini:
 2874  *
 2875  *      Deconstruct the route table for this bridge.
 2876  */
 2877 static void
 2878 bridge_rtable_fini(struct bridge_softc *sc)
 2879 {
 2880 
 2881         KASSERT(sc->sc_brtcnt == 0,
 2882             ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
 2883         free(sc->sc_rthash, M_DEVBUF);
 2884 }
 2885 
 2886 /*
 2887  * The following hash function is adapted from "Hash Functions" by Bob Jenkins
 2888  * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
 2889  */
 2890 #define mix(a, b, c)                                                    \
 2891 do {                                                                    \
 2892         a -= b; a -= c; a ^= (c >> 13);                                 \
 2893         b -= c; b -= a; b ^= (a << 8);                                  \
 2894         c -= a; c -= b; c ^= (b >> 13);                                 \
 2895         a -= b; a -= c; a ^= (c >> 12);                                 \
 2896         b -= c; b -= a; b ^= (a << 16);                                 \
 2897         c -= a; c -= b; c ^= (b >> 5);                                  \
 2898         a -= b; a -= c; a ^= (c >> 3);                                  \
 2899         b -= c; b -= a; b ^= (a << 10);                                 \
 2900         c -= a; c -= b; c ^= (b >> 15);                                 \
 2901 } while (/*CONSTCOND*/0)
 2902 
 2903 static __inline uint32_t
 2904 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
 2905 {
 2906         uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
 2907 
 2908         b += addr[5] << 8;
 2909         b += addr[4];
 2910         a += addr[3] << 24;
 2911         a += addr[2] << 16;
 2912         a += addr[1] << 8;
 2913         a += addr[0];
 2914 
 2915         mix(a, b, c);
 2916 
 2917         return (c & BRIDGE_RTHASH_MASK);
 2918 }
 2919 
 2920 #undef mix
 2921 
 2922 static int
 2923 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
 2924 {
 2925         int i, d;
 2926 
 2927         for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
 2928                 d = ((int)a[i]) - ((int)b[i]);
 2929         }
 2930 
 2931         return (d);
 2932 }
 2933 
 2934 /*
 2935  * bridge_rtnode_lookup:
 2936  *
 2937  *      Look up a bridge route node for the specified destination. Compare the
 2938  *      vlan id or if zero then just return the first match.
 2939  */
 2940 static struct bridge_rtnode *
 2941 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
 2942 {
 2943         struct bridge_rtnode *brt;
 2944         uint32_t hash;
 2945         int dir;
 2946 
 2947         BRIDGE_LOCK_ASSERT(sc);
 2948 
 2949         hash = bridge_rthash(sc, addr);
 2950         LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
 2951                 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
 2952                 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
 2953                         return (brt);
 2954                 if (dir > 0)
 2955                         return (NULL);
 2956         }
 2957 
 2958         return (NULL);
 2959 }
 2960 
 2961 /*
 2962  * bridge_rtnode_insert:
 2963  *
 2964  *      Insert the specified bridge node into the route table.  We
 2965  *      assume the entry is not already in the table.
 2966  */
 2967 static int
 2968 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
 2969 {
 2970         struct bridge_rtnode *lbrt;
 2971         uint32_t hash;
 2972         int dir;
 2973 
 2974         BRIDGE_LOCK_ASSERT(sc);
 2975 
 2976         hash = bridge_rthash(sc, brt->brt_addr);
 2977 
 2978         lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
 2979         if (lbrt == NULL) {
 2980                 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
 2981                 goto out;
 2982         }
 2983 
 2984         do {
 2985                 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
 2986                 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
 2987                         return (EEXIST);
 2988                 if (dir > 0) {
 2989                         LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
 2990                         goto out;
 2991                 }
 2992                 if (LIST_NEXT(lbrt, brt_hash) == NULL) {
 2993                         LIST_INSERT_AFTER(lbrt, brt, brt_hash);
 2994                         goto out;
 2995                 }
 2996                 lbrt = LIST_NEXT(lbrt, brt_hash);
 2997         } while (lbrt != NULL);
 2998 
 2999 #ifdef DIAGNOSTIC
 3000         panic("bridge_rtnode_insert: impossible");
 3001 #endif
 3002 
 3003 out:
 3004         LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
 3005         sc->sc_brtcnt++;
 3006 
 3007         return (0);
 3008 }
 3009 
 3010 /*
 3011  * bridge_rtnode_destroy:
 3012  *
 3013  *      Destroy a bridge rtnode.
 3014  */
 3015 static void
 3016 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
 3017 {
 3018         BRIDGE_LOCK_ASSERT(sc);
 3019 
 3020         LIST_REMOVE(brt, brt_hash);
 3021 
 3022         LIST_REMOVE(brt, brt_list);
 3023         sc->sc_brtcnt--;
 3024         brt->brt_dst->bif_addrcnt--;
 3025         uma_zfree(bridge_rtnode_zone, brt);
 3026 }
 3027 
 3028 /*
 3029  * bridge_rtable_expire:
 3030  *
 3031  *      Set the expiry time for all routes on an interface.
 3032  */
 3033 static void
 3034 bridge_rtable_expire(struct ifnet *ifp, int age)
 3035 {
 3036         struct bridge_softc *sc = ifp->if_bridge;
 3037         struct bridge_rtnode *brt;
 3038 
 3039         BRIDGE_LOCK(sc);
 3040 
 3041         /*
 3042          * If the age is zero then flush, otherwise set all the expiry times to
 3043          * age for the interface
 3044          */
 3045         if (age == 0)
 3046                 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
 3047         else {
 3048                 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
 3049                         /* Cap the expiry time to 'age' */
 3050                         if (brt->brt_ifp == ifp &&
 3051                             brt->brt_expire > time_uptime + age &&
 3052                             (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
 3053                                 brt->brt_expire = time_uptime + age;
 3054                 }
 3055         }
 3056         BRIDGE_UNLOCK(sc);
 3057 }
 3058 
 3059 /*
 3060  * bridge_state_change:
 3061  *
 3062  *      Callback from the bridgestp code when a port changes states.
 3063  */
 3064 static void
 3065 bridge_state_change(struct ifnet *ifp, int state)
 3066 {
 3067         struct bridge_softc *sc = ifp->if_bridge;
 3068         static const char *stpstates[] = {
 3069                 "disabled",
 3070                 "listening",
 3071                 "learning",
 3072                 "forwarding",
 3073                 "blocking",
 3074                 "discarding"
 3075         };
 3076 
 3077         CURVNET_SET(ifp->if_vnet);
 3078         if (V_log_stp)
 3079                 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
 3080                     sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
 3081         CURVNET_RESTORE();
 3082 }
 3083 
 3084 /*
 3085  * Send bridge packets through pfil if they are one of the types pfil can deal
 3086  * with, or if they are ARP or REVARP.  (pfil will pass ARP and REVARP without
 3087  * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
 3088  * that interface.
 3089  */
 3090 static int
 3091 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
 3092 {
 3093         int snap, error, i, hlen;
 3094         struct ether_header *eh1, eh2;
 3095         struct ip *ip;
 3096         struct llc llc1;
 3097         u_int16_t ether_type;
 3098 
 3099         snap = 0;
 3100         error = -1;     /* Default error if not error == 0 */
 3101 
 3102 #if 0
 3103         /* we may return with the IP fields swapped, ensure its not shared */
 3104         KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
 3105 #endif
 3106 
 3107         if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0)
 3108                 return (0); /* filtering is disabled */
 3109 
 3110         i = min((*mp)->m_pkthdr.len, max_protohdr);
 3111         if ((*mp)->m_len < i) {
 3112             *mp = m_pullup(*mp, i);
 3113             if (*mp == NULL) {
 3114                 printf("%s: m_pullup failed\n", __func__);
 3115                 return (-1);
 3116             }
 3117         }
 3118 
 3119         eh1 = mtod(*mp, struct ether_header *);
 3120         ether_type = ntohs(eh1->ether_type);
 3121 
 3122         /*
 3123          * Check for SNAP/LLC.
 3124          */
 3125         if (ether_type < ETHERMTU) {
 3126                 struct llc *llc2 = (struct llc *)(eh1 + 1);
 3127 
 3128                 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
 3129                     llc2->llc_dsap == LLC_SNAP_LSAP &&
 3130                     llc2->llc_ssap == LLC_SNAP_LSAP &&
 3131                     llc2->llc_control == LLC_UI) {
 3132                         ether_type = htons(llc2->llc_un.type_snap.ether_type);
 3133                         snap = 1;
 3134                 }
 3135         }
 3136 
 3137         /*
 3138          * If we're trying to filter bridge traffic, don't look at anything
 3139          * other than IP and ARP traffic.  If the filter doesn't understand
 3140          * IPv6, don't allow IPv6 through the bridge either.  This is lame
 3141          * since if we really wanted, say, an AppleTalk filter, we are hosed,
 3142          * but of course we don't have an AppleTalk filter to begin with.
 3143          * (Note that since pfil doesn't understand ARP it will pass *ALL*
 3144          * ARP traffic.)
 3145          */
 3146         switch (ether_type) {
 3147                 case ETHERTYPE_ARP:
 3148                 case ETHERTYPE_REVARP:
 3149                         if (V_pfil_ipfw_arp == 0)
 3150                                 return (0); /* Automatically pass */
 3151                         break;
 3152 
 3153                 case ETHERTYPE_IP:
 3154 #ifdef INET6
 3155                 case ETHERTYPE_IPV6:
 3156 #endif /* INET6 */
 3157                         break;
 3158                 default:
 3159                         /*
 3160                          * Check to see if the user wants to pass non-ip
 3161                          * packets, these will not be checked by pfil(9) and
 3162                          * passed unconditionally so the default is to drop.
 3163                          */
 3164                         if (V_pfil_onlyip)
 3165                                 goto bad;
 3166         }
 3167 
 3168         /* Run the packet through pfil before stripping link headers */
 3169         if (PFIL_HOOKED(&V_link_pfil_hook) && V_pfil_ipfw != 0 &&
 3170                         dir == PFIL_OUT && ifp != NULL) {
 3171 
 3172                 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL);
 3173 
 3174                 if (*mp == NULL || error != 0) /* packet consumed by filter */
 3175                         return (error);
 3176         }
 3177 
 3178         /* Strip off the Ethernet header and keep a copy. */
 3179         m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
 3180         m_adj(*mp, ETHER_HDR_LEN);
 3181 
 3182         /* Strip off snap header, if present */
 3183         if (snap) {
 3184                 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
 3185                 m_adj(*mp, sizeof(struct llc));
 3186         }
 3187 
 3188         /*
 3189          * Check the IP header for alignment and errors
 3190          */
 3191         if (dir == PFIL_IN) {
 3192                 switch (ether_type) {
 3193                         case ETHERTYPE_IP:
 3194                                 error = bridge_ip_checkbasic(mp);
 3195                                 break;
 3196 #ifdef INET6
 3197                         case ETHERTYPE_IPV6:
 3198                                 error = bridge_ip6_checkbasic(mp);
 3199                                 break;
 3200 #endif /* INET6 */
 3201                         default:
 3202                                 error = 0;
 3203                 }
 3204                 if (error)
 3205                         goto bad;
 3206         }
 3207 
 3208         error = 0;
 3209 
 3210         /*
 3211          * Run the packet through pfil
 3212          */
 3213         switch (ether_type) {
 3214         case ETHERTYPE_IP:
 3215                 /*
 3216                  * Run pfil on the member interface and the bridge, both can
 3217                  * be skipped by clearing pfil_member or pfil_bridge.
 3218                  *
 3219                  * Keep the order:
 3220                  *   in_if -> bridge_if -> out_if
 3221                  */
 3222                 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL)
 3223                         error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
 3224                                         dir, NULL);
 3225 
 3226                 if (*mp == NULL || error != 0) /* filter may consume */
 3227                         break;
 3228 
 3229                 if (V_pfil_member && ifp != NULL)
 3230                         error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp,
 3231                                         dir, NULL);
 3232 
 3233                 if (*mp == NULL || error != 0) /* filter may consume */
 3234                         break;
 3235 
 3236                 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL)
 3237                         error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
 3238                                         dir, NULL);
 3239 
 3240                 if (*mp == NULL || error != 0) /* filter may consume */
 3241                         break;
 3242 
 3243                 /* check if we need to fragment the packet */
 3244                 /* bridge_fragment generates a mbuf chain of packets */
 3245                 /* that already include eth headers */
 3246                 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) {
 3247                         i = (*mp)->m_pkthdr.len;
 3248                         if (i > ifp->if_mtu) {
 3249                                 error = bridge_fragment(ifp, mp, &eh2, snap,
 3250                                             &llc1);
 3251                                 return (error);
 3252                         }
 3253                 }
 3254 
 3255                 /* Recalculate the ip checksum. */
 3256                 ip = mtod(*mp, struct ip *);
 3257                 hlen = ip->ip_hl << 2;
 3258                 if (hlen < sizeof(struct ip))
 3259                         goto bad;
 3260                 if (hlen > (*mp)->m_len) {
 3261                         if ((*mp = m_pullup(*mp, hlen)) == NULL)
 3262                                 goto bad;
 3263                         ip = mtod(*mp, struct ip *);
 3264                         if (ip == NULL)
 3265                                 goto bad;
 3266                 }
 3267                 ip->ip_sum = 0;
 3268                 if (hlen == sizeof(struct ip))
 3269                         ip->ip_sum = in_cksum_hdr(ip);
 3270                 else
 3271                         ip->ip_sum = in_cksum(*mp, hlen);
 3272 
 3273                 break;
 3274 #ifdef INET6
 3275         case ETHERTYPE_IPV6:
 3276                 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL)
 3277                         error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
 3278                                         dir, NULL);
 3279 
 3280                 if (*mp == NULL || error != 0) /* filter may consume */
 3281                         break;
 3282 
 3283                 if (V_pfil_member && ifp != NULL)
 3284                         error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp,
 3285                                         dir, NULL);
 3286 
 3287                 if (*mp == NULL || error != 0) /* filter may consume */
 3288                         break;
 3289 
 3290                 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL)
 3291                         error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
 3292                                         dir, NULL);
 3293                 break;
 3294 #endif
 3295         default:
 3296                 error = 0;
 3297                 break;
 3298         }
 3299 
 3300         if (*mp == NULL)
 3301                 return (error);
 3302         if (error != 0)
 3303                 goto bad;
 3304 
 3305         error = -1;
 3306 
 3307         /*
 3308          * Finally, put everything back the way it was and return
 3309          */
 3310         if (snap) {
 3311                 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT);
 3312                 if (*mp == NULL)
 3313                         return (error);
 3314                 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
 3315         }
 3316 
 3317         M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT);
 3318         if (*mp == NULL)
 3319                 return (error);
 3320         bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
 3321 
 3322         return (0);
 3323 
 3324 bad:
 3325         m_freem(*mp);
 3326         *mp = NULL;
 3327         return (error);
 3328 }
 3329 
 3330 /*
 3331  * Perform basic checks on header size since
 3332  * pfil assumes ip_input has already processed
 3333  * it for it.  Cut-and-pasted from ip_input.c.
 3334  * Given how simple the IPv6 version is,
 3335  * does the IPv4 version really need to be
 3336  * this complicated?
 3337  *
 3338  * XXX Should we update ipstat here, or not?
 3339  * XXX Right now we update ipstat but not
 3340  * XXX csum_counter.
 3341  */
 3342 static int
 3343 bridge_ip_checkbasic(struct mbuf **mp)
 3344 {
 3345         struct mbuf *m = *mp;
 3346         struct ip *ip;
 3347         int len, hlen;
 3348         u_short sum;
 3349 
 3350         if (*mp == NULL)
 3351                 return (-1);
 3352 
 3353         if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
 3354                 if ((m = m_copyup(m, sizeof(struct ip),
 3355                         (max_linkhdr + 3) & ~3)) == NULL) {
 3356                         /* XXXJRT new stat, please */
 3357                         KMOD_IPSTAT_INC(ips_toosmall);
 3358                         goto bad;
 3359                 }
 3360         } else if (__predict_false(m->m_len < sizeof (struct ip))) {
 3361                 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
 3362                         KMOD_IPSTAT_INC(ips_toosmall);
 3363                         goto bad;
 3364                 }
 3365         }
 3366         ip = mtod(m, struct ip *);
 3367         if (ip == NULL) goto bad;
 3368 
 3369         if (ip->ip_v != IPVERSION) {
 3370                 KMOD_IPSTAT_INC(ips_badvers);
 3371                 goto bad;
 3372         }
 3373         hlen = ip->ip_hl << 2;
 3374         if (hlen < sizeof(struct ip)) { /* minimum header length */
 3375                 KMOD_IPSTAT_INC(ips_badhlen);
 3376                 goto bad;
 3377         }
 3378         if (hlen > m->m_len) {
 3379                 if ((m = m_pullup(m, hlen)) == NULL) {
 3380                         KMOD_IPSTAT_INC(ips_badhlen);
 3381                         goto bad;
 3382                 }
 3383                 ip = mtod(m, struct ip *);
 3384                 if (ip == NULL) goto bad;
 3385         }
 3386 
 3387         if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
 3388                 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
 3389         } else {
 3390                 if (hlen == sizeof(struct ip)) {
 3391                         sum = in_cksum_hdr(ip);
 3392                 } else {
 3393                         sum = in_cksum(m, hlen);
 3394                 }
 3395         }
 3396         if (sum) {
 3397                 KMOD_IPSTAT_INC(ips_badsum);
 3398                 goto bad;
 3399         }
 3400 
 3401         /* Retrieve the packet length. */
 3402         len = ntohs(ip->ip_len);
 3403 
 3404         /*
 3405          * Check for additional length bogosity
 3406          */
 3407         if (len < hlen) {
 3408                 KMOD_IPSTAT_INC(ips_badlen);
 3409                 goto bad;
 3410         }
 3411 
 3412         /*
 3413          * Check that the amount of data in the buffers
 3414          * is as at least much as the IP header would have us expect.
 3415          * Drop packet if shorter than we expect.
 3416          */
 3417         if (m->m_pkthdr.len < len) {
 3418                 KMOD_IPSTAT_INC(ips_tooshort);
 3419                 goto bad;
 3420         }
 3421 
 3422         /* Checks out, proceed */
 3423         *mp = m;
 3424         return (0);
 3425 
 3426 bad:
 3427         *mp = m;
 3428         return (-1);
 3429 }
 3430 
 3431 #ifdef INET6
 3432 /*
 3433  * Same as above, but for IPv6.
 3434  * Cut-and-pasted from ip6_input.c.
 3435  * XXX Should we update ip6stat, or not?
 3436  */
 3437 static int
 3438 bridge_ip6_checkbasic(struct mbuf **mp)
 3439 {
 3440         struct mbuf *m = *mp;
 3441         struct ip6_hdr *ip6;
 3442 
 3443         /*
 3444          * If the IPv6 header is not aligned, slurp it up into a new
 3445          * mbuf with space for link headers, in the event we forward
 3446          * it.  Otherwise, if it is aligned, make sure the entire base
 3447          * IPv6 header is in the first mbuf of the chain.
 3448          */
 3449         if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
 3450                 struct ifnet *inifp = m->m_pkthdr.rcvif;
 3451                 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
 3452                             (max_linkhdr + 3) & ~3)) == NULL) {
 3453                         /* XXXJRT new stat, please */
 3454                         IP6STAT_INC(ip6s_toosmall);
 3455                         in6_ifstat_inc(inifp, ifs6_in_hdrerr);
 3456                         goto bad;
 3457                 }
 3458         } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
 3459                 struct ifnet *inifp = m->m_pkthdr.rcvif;
 3460                 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
 3461                         IP6STAT_INC(ip6s_toosmall);
 3462                         in6_ifstat_inc(inifp, ifs6_in_hdrerr);
 3463                         goto bad;
 3464                 }
 3465         }
 3466 
 3467         ip6 = mtod(m, struct ip6_hdr *);
 3468 
 3469         if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
 3470                 IP6STAT_INC(ip6s_badvers);
 3471                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
 3472                 goto bad;
 3473         }
 3474 
 3475         /* Checks out, proceed */
 3476         *mp = m;
 3477         return (0);
 3478 
 3479 bad:
 3480         *mp = m;
 3481         return (-1);
 3482 }
 3483 #endif /* INET6 */
 3484 
 3485 /*
 3486  * bridge_fragment:
 3487  *
 3488  *      Fragment mbuf chain in multiple packets and prepend ethernet header.
 3489  */
 3490 static int
 3491 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh,
 3492     int snap, struct llc *llc)
 3493 {
 3494         struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL;
 3495         struct ip *ip;
 3496         int error = -1;
 3497 
 3498         if (m->m_len < sizeof(struct ip) &&
 3499             (m = m_pullup(m, sizeof(struct ip))) == NULL)
 3500                 goto dropit;
 3501         ip = mtod(m, struct ip *);
 3502 
 3503         m->m_pkthdr.csum_flags |= CSUM_IP;
 3504         error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist);
 3505         if (error)
 3506                 goto dropit;
 3507 
 3508         /*
 3509          * Walk the chain and re-add the Ethernet header for
 3510          * each mbuf packet.
 3511          */
 3512         for (mcur = m; mcur; mcur = mcur->m_nextpkt) {
 3513                 nextpkt = mcur->m_nextpkt;
 3514                 mcur->m_nextpkt = NULL;
 3515                 if (snap) {
 3516                         M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT);
 3517                         if (mcur == NULL) {
 3518                                 error = ENOBUFS;
 3519                                 if (mprev != NULL)
 3520                                         mprev->m_nextpkt = nextpkt;
 3521                                 goto dropit;
 3522                         }
 3523                         bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc));
 3524                 }
 3525 
 3526                 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT);
 3527                 if (mcur == NULL) {
 3528                         error = ENOBUFS;
 3529                         if (mprev != NULL)
 3530                                 mprev->m_nextpkt = nextpkt;
 3531                         goto dropit;
 3532                 }
 3533                 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN);
 3534 
 3535                 /*
 3536                  * The previous two M_PREPEND could have inserted one or two
 3537                  * mbufs in front so we have to update the previous packet's
 3538                  * m_nextpkt.
 3539                  */
 3540                 mcur->m_nextpkt = nextpkt;
 3541                 if (mprev != NULL)
 3542                         mprev->m_nextpkt = mcur;
 3543                 else {
 3544                         /* The first mbuf in the original chain needs to be
 3545                          * updated. */
 3546                         *mp = mcur;
 3547                 }
 3548                 mprev = mcur;
 3549         }
 3550 
 3551         KMOD_IPSTAT_INC(ips_fragmented);
 3552         return (error);
 3553 
 3554 dropit:
 3555         for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */
 3556                 m = mcur->m_nextpkt;
 3557                 m_freem(mcur);
 3558         }
 3559         return (error);
 3560 }
 3561 
 3562 static void
 3563 bridge_linkstate(struct ifnet *ifp)
 3564 {
 3565         struct bridge_softc *sc = ifp->if_bridge;
 3566         struct bridge_iflist *bif;
 3567 
 3568         BRIDGE_LOCK(sc);
 3569         bif = bridge_lookup_member_if(sc, ifp);
 3570         if (bif == NULL) {
 3571                 BRIDGE_UNLOCK(sc);
 3572                 return;
 3573         }
 3574         bridge_linkcheck(sc);
 3575         BRIDGE_UNLOCK(sc);
 3576 
 3577         bstp_linkstate(&bif->bif_stp);
 3578 }
 3579 
 3580 static void
 3581 bridge_linkcheck(struct bridge_softc *sc)
 3582 {
 3583         struct bridge_iflist *bif;
 3584         int new_link, hasls;
 3585 
 3586         BRIDGE_LOCK_ASSERT(sc);
 3587         new_link = LINK_STATE_DOWN;
 3588         hasls = 0;
 3589         /* Our link is considered up if at least one of our ports is active */
 3590         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 3591                 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
 3592                         hasls++;
 3593                 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
 3594                         new_link = LINK_STATE_UP;
 3595                         break;
 3596                 }
 3597         }
 3598         if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) {
 3599                 /* If no interfaces support link-state then we default to up */
 3600                 new_link = LINK_STATE_UP;
 3601         }
 3602         if_link_state_change(sc->sc_ifp, new_link);
 3603 }

Cache object: e0f4e951b204677441650c06b884bd16


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