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

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    1 /*      $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $       */
    2 
    3 /*
    4  * Copyright 2001 Wasabi Systems, Inc.
    5  * All rights reserved.
    6  *
    7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 3. All advertising materials mentioning features or use of this software
   18  *    must display the following acknowledgement:
   19  *      This product includes software developed for the NetBSD Project by
   20  *      Wasabi Systems, Inc.
   21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
   22  *    or promote products derived from this software without specific prior
   23  *    written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
   26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
   29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   35  * POSSIBILITY OF SUCH DAMAGE.
   36  */
   37 
   38 /*
   39  * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net)
   40  * All rights reserved.
   41  *
   42  * Redistribution and use in source and binary forms, with or without
   43  * modification, are permitted provided that the following conditions
   44  * are met:
   45  * 1. Redistributions of source code must retain the above copyright
   46  *    notice, this list of conditions and the following disclaimer.
   47  * 2. Redistributions in binary form must reproduce the above copyright
   48  *    notice, this list of conditions and the following disclaimer in the
   49  *    documentation and/or other materials provided with the distribution.
   50  *
   51  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   52  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   53  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   54  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
   55  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   56  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   57  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   58  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   59  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   60  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   61  * POSSIBILITY OF SUCH DAMAGE.
   62  *
   63  * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp
   64  */
   65 
   66 /*
   67  * Network interface bridge support.
   68  *
   69  * TODO:
   70  *
   71  *      - Currently only supports Ethernet-like interfaces (Ethernet,
   72  *        802.11, VLANs on Ethernet, etc.)  Figure out a nice way
   73  *        to bridge other types of interfaces (FDDI-FDDI, and maybe
   74  *        consider heterogenous bridges).
   75  */
   76 
   77 #include <sys/cdefs.h>
   78 __FBSDID("$FreeBSD: releng/10.1/sys/net/if_bridge.c 253751 2013-07-28 19:49:39Z hrs $");
   79 
   80 #include "opt_inet.h"
   81 #include "opt_inet6.h"
   82 
   83 #include <sys/param.h>
   84 #include <sys/mbuf.h>
   85 #include <sys/malloc.h>
   86 #include <sys/protosw.h>
   87 #include <sys/systm.h>
   88 #include <sys/jail.h>
   89 #include <sys/time.h>
   90 #include <sys/socket.h> /* for net/if.h */
   91 #include <sys/sockio.h>
   92 #include <sys/ctype.h>  /* string functions */
   93 #include <sys/kernel.h>
   94 #include <sys/random.h>
   95 #include <sys/syslog.h>
   96 #include <sys/sysctl.h>
   97 #include <vm/uma.h>
   98 #include <sys/module.h>
   99 #include <sys/priv.h>
  100 #include <sys/proc.h>
  101 #include <sys/lock.h>
  102 #include <sys/mutex.h>
  103 
  104 #include <net/bpf.h>
  105 #include <net/if.h>
  106 #include <net/if_clone.h>
  107 #include <net/if_dl.h>
  108 #include <net/if_types.h>
  109 #include <net/if_var.h>
  110 #include <net/pfil.h>
  111 #include <net/vnet.h>
  112 
  113 #include <netinet/in.h> /* for struct arpcom */
  114 #include <netinet/in_systm.h>
  115 #include <netinet/in_var.h>
  116 #include <netinet/ip.h>
  117 #include <netinet/ip_var.h>
  118 #ifdef INET6
  119 #include <netinet/ip6.h>
  120 #include <netinet6/ip6_var.h>
  121 #include <netinet6/in6_ifattach.h>
  122 #endif
  123 #if defined(INET) || defined(INET6)
  124 #include <netinet/ip_carp.h>
  125 #endif
  126 #include <machine/in_cksum.h>
  127 #include <netinet/if_ether.h> /* for struct arpcom */
  128 #include <net/bridgestp.h>
  129 #include <net/if_bridgevar.h>
  130 #include <net/if_llc.h>
  131 #include <net/if_vlan_var.h>
  132 
  133 #include <net/route.h>
  134 
  135 /*
  136  * Size of the route hash table.  Must be a power of two.
  137  */
  138 #ifndef BRIDGE_RTHASH_SIZE
  139 #define BRIDGE_RTHASH_SIZE              1024
  140 #endif
  141 
  142 #define BRIDGE_RTHASH_MASK              (BRIDGE_RTHASH_SIZE - 1)
  143 
  144 /*
  145  * Default maximum number of addresses to cache.
  146  */
  147 #ifndef BRIDGE_RTABLE_MAX
  148 #define BRIDGE_RTABLE_MAX               2000
  149 #endif
  150 
  151 /*
  152  * Timeout (in seconds) for entries learned dynamically.
  153  */
  154 #ifndef BRIDGE_RTABLE_TIMEOUT
  155 #define BRIDGE_RTABLE_TIMEOUT           (20 * 60)       /* same as ARP */
  156 #endif
  157 
  158 /*
  159  * Number of seconds between walks of the route list.
  160  */
  161 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD
  162 #define BRIDGE_RTABLE_PRUNE_PERIOD      (5 * 60)
  163 #endif
  164 
  165 /*
  166  * List of capabilities to possibly mask on the member interface.
  167  */
  168 #define BRIDGE_IFCAPS_MASK              (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM)
  169 
  170 /*
  171  * List of capabilities to strip
  172  */
  173 #define BRIDGE_IFCAPS_STRIP             IFCAP_LRO
  174 
  175 /*
  176  * Bridge interface list entry.
  177  */
  178 struct bridge_iflist {
  179         LIST_ENTRY(bridge_iflist) bif_next;
  180         struct ifnet            *bif_ifp;       /* member if */
  181         struct bstp_port        bif_stp;        /* STP state */
  182         uint32_t                bif_flags;      /* member if flags */
  183         int                     bif_savedcaps;  /* saved capabilities */
  184         uint32_t                bif_addrmax;    /* max # of addresses */
  185         uint32_t                bif_addrcnt;    /* cur. # of addresses */
  186         uint32_t                bif_addrexceeded;/* # of address violations */
  187 };
  188 
  189 /*
  190  * Bridge route node.
  191  */
  192 struct bridge_rtnode {
  193         LIST_ENTRY(bridge_rtnode) brt_hash;     /* hash table linkage */
  194         LIST_ENTRY(bridge_rtnode) brt_list;     /* list linkage */
  195         struct bridge_iflist    *brt_dst;       /* destination if */
  196         unsigned long           brt_expire;     /* expiration time */
  197         uint8_t                 brt_flags;      /* address flags */
  198         uint8_t                 brt_addr[ETHER_ADDR_LEN];
  199         uint16_t                brt_vlan;       /* vlan id */
  200 };
  201 #define brt_ifp                 brt_dst->bif_ifp
  202 
  203 /*
  204  * Software state for each bridge.
  205  */
  206 struct bridge_softc {
  207         struct ifnet            *sc_ifp;        /* make this an interface */
  208         LIST_ENTRY(bridge_softc) sc_list;
  209         struct mtx              sc_mtx;
  210         struct cv               sc_cv;
  211         uint32_t                sc_brtmax;      /* max # of addresses */
  212         uint32_t                sc_brtcnt;      /* cur. # of addresses */
  213         uint32_t                sc_brttimeout;  /* rt timeout in seconds */
  214         struct callout          sc_brcallout;   /* bridge callout */
  215         uint32_t                sc_iflist_ref;  /* refcount for sc_iflist */
  216         uint32_t                sc_iflist_xcnt; /* refcount for sc_iflist */
  217         LIST_HEAD(, bridge_iflist) sc_iflist;   /* member interface list */
  218         LIST_HEAD(, bridge_rtnode) *sc_rthash;  /* our forwarding table */
  219         LIST_HEAD(, bridge_rtnode) sc_rtlist;   /* list version of above */
  220         uint32_t                sc_rthash_key;  /* key for hash */
  221         LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */
  222         struct bstp_state       sc_stp;         /* STP state */
  223         uint32_t                sc_brtexceeded; /* # of cache drops */
  224         struct ifnet            *sc_ifaddr;     /* member mac copied from */
  225         u_char                  sc_defaddr[6];  /* Default MAC address */
  226 };
  227 
  228 static struct mtx       bridge_list_mtx;
  229 eventhandler_tag        bridge_detach_cookie = NULL;
  230 
  231 int     bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
  232 
  233 uma_zone_t bridge_rtnode_zone;
  234 
  235 static int      bridge_clone_create(struct if_clone *, int, caddr_t);
  236 static void     bridge_clone_destroy(struct ifnet *);
  237 
  238 static int      bridge_ioctl(struct ifnet *, u_long, caddr_t);
  239 static void     bridge_mutecaps(struct bridge_softc *);
  240 static void     bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *,
  241                     int);
  242 static void     bridge_ifdetach(void *arg __unused, struct ifnet *);
  243 static void     bridge_init(void *);
  244 static void     bridge_dummynet(struct mbuf *, struct ifnet *);
  245 static void     bridge_stop(struct ifnet *, int);
  246 static int      bridge_transmit(struct ifnet *, struct mbuf *);
  247 static void     bridge_qflush(struct ifnet *);
  248 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
  249 static int      bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
  250                     struct rtentry *);
  251 static int      bridge_enqueue(struct bridge_softc *, struct ifnet *,
  252                     struct mbuf *);
  253 static void     bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
  254 
  255 static void     bridge_forward(struct bridge_softc *, struct bridge_iflist *,
  256                     struct mbuf *m);
  257 
  258 static void     bridge_timer(void *);
  259 
  260 static void     bridge_broadcast(struct bridge_softc *, struct ifnet *,
  261                     struct mbuf *, int);
  262 static void     bridge_span(struct bridge_softc *, struct mbuf *);
  263 
  264 static int      bridge_rtupdate(struct bridge_softc *, const uint8_t *,
  265                     uint16_t, struct bridge_iflist *, int, uint8_t);
  266 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
  267                     uint16_t);
  268 static void     bridge_rttrim(struct bridge_softc *);
  269 static void     bridge_rtage(struct bridge_softc *);
  270 static void     bridge_rtflush(struct bridge_softc *, int);
  271 static int      bridge_rtdaddr(struct bridge_softc *, const uint8_t *,
  272                     uint16_t);
  273 
  274 static void     bridge_rtable_init(struct bridge_softc *);
  275 static void     bridge_rtable_fini(struct bridge_softc *);
  276 
  277 static int      bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
  278 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
  279                     const uint8_t *, uint16_t);
  280 static int      bridge_rtnode_insert(struct bridge_softc *,
  281                     struct bridge_rtnode *);
  282 static void     bridge_rtnode_destroy(struct bridge_softc *,
  283                     struct bridge_rtnode *);
  284 static void     bridge_rtable_expire(struct ifnet *, int);
  285 static void     bridge_state_change(struct ifnet *, int);
  286 
  287 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
  288                     const char *name);
  289 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
  290                     struct ifnet *ifp);
  291 static void     bridge_delete_member(struct bridge_softc *,
  292                     struct bridge_iflist *, int);
  293 static void     bridge_delete_span(struct bridge_softc *,
  294                     struct bridge_iflist *);
  295 
  296 static int      bridge_ioctl_add(struct bridge_softc *, void *);
  297 static int      bridge_ioctl_del(struct bridge_softc *, void *);
  298 static int      bridge_ioctl_gifflags(struct bridge_softc *, void *);
  299 static int      bridge_ioctl_sifflags(struct bridge_softc *, void *);
  300 static int      bridge_ioctl_scache(struct bridge_softc *, void *);
  301 static int      bridge_ioctl_gcache(struct bridge_softc *, void *);
  302 static int      bridge_ioctl_gifs(struct bridge_softc *, void *);
  303 static int      bridge_ioctl_rts(struct bridge_softc *, void *);
  304 static int      bridge_ioctl_saddr(struct bridge_softc *, void *);
  305 static int      bridge_ioctl_sto(struct bridge_softc *, void *);
  306 static int      bridge_ioctl_gto(struct bridge_softc *, void *);
  307 static int      bridge_ioctl_daddr(struct bridge_softc *, void *);
  308 static int      bridge_ioctl_flush(struct bridge_softc *, void *);
  309 static int      bridge_ioctl_gpri(struct bridge_softc *, void *);
  310 static int      bridge_ioctl_spri(struct bridge_softc *, void *);
  311 static int      bridge_ioctl_ght(struct bridge_softc *, void *);
  312 static int      bridge_ioctl_sht(struct bridge_softc *, void *);
  313 static int      bridge_ioctl_gfd(struct bridge_softc *, void *);
  314 static int      bridge_ioctl_sfd(struct bridge_softc *, void *);
  315 static int      bridge_ioctl_gma(struct bridge_softc *, void *);
  316 static int      bridge_ioctl_sma(struct bridge_softc *, void *);
  317 static int      bridge_ioctl_sifprio(struct bridge_softc *, void *);
  318 static int      bridge_ioctl_sifcost(struct bridge_softc *, void *);
  319 static int      bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *);
  320 static int      bridge_ioctl_addspan(struct bridge_softc *, void *);
  321 static int      bridge_ioctl_delspan(struct bridge_softc *, void *);
  322 static int      bridge_ioctl_gbparam(struct bridge_softc *, void *);
  323 static int      bridge_ioctl_grte(struct bridge_softc *, void *);
  324 static int      bridge_ioctl_gifsstp(struct bridge_softc *, void *);
  325 static int      bridge_ioctl_sproto(struct bridge_softc *, void *);
  326 static int      bridge_ioctl_stxhc(struct bridge_softc *, void *);
  327 static int      bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
  328                     int);
  329 static int      bridge_ip_checkbasic(struct mbuf **mp);
  330 #ifdef INET6
  331 static int      bridge_ip6_checkbasic(struct mbuf **mp);
  332 #endif /* INET6 */
  333 static int      bridge_fragment(struct ifnet *, struct mbuf *,
  334                     struct ether_header *, int, struct llc *);
  335 static void     bridge_linkstate(struct ifnet *ifp);
  336 static void     bridge_linkcheck(struct bridge_softc *sc);
  337 
  338 extern void (*bridge_linkstate_p)(struct ifnet *ifp);
  339 
  340 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
  341 #define VLANTAGOF(_m)   \
  342     (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
  343 
  344 static struct bstp_cb_ops bridge_ops = {
  345         .bcb_state = bridge_state_change,
  346         .bcb_rtage = bridge_rtable_expire
  347 };
  348 
  349 SYSCTL_DECL(_net_link);
  350 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
  351 
  352 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */
  353 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */
  354 static int pfil_member = 1; /* run pfil hooks on the member interface */
  355 static int pfil_ipfw = 0;   /* layer2 filter with ipfw */
  356 static int pfil_ipfw_arp = 0;   /* layer2 filter with ipfw */
  357 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for
  358                                    locally destined packets */
  359 static int log_stp   = 0;   /* log STP state changes */
  360 static int bridge_inherit_mac = 0;   /* share MAC with first bridge member */
  361 TUNABLE_INT("net.link.bridge.pfil_onlyip", &pfil_onlyip);
  362 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW,
  363     &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled");
  364 TUNABLE_INT("net.link.bridge.ipfw_arp", &pfil_ipfw_arp);
  365 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW,
  366     &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2");
  367 TUNABLE_INT("net.link.bridge.pfil_bridge", &pfil_bridge);
  368 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW,
  369     &pfil_bridge, 0, "Packet filter on the bridge interface");
  370 TUNABLE_INT("net.link.bridge.pfil_member", &pfil_member);
  371 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW,
  372     &pfil_member, 0, "Packet filter on the member interface");
  373 TUNABLE_INT("net.link.bridge.pfil_local_phys", &pfil_local_phys);
  374 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW,
  375     &pfil_local_phys, 0,
  376     "Packet filter on the physical interface for locally destined packets");
  377 TUNABLE_INT("net.link.bridge.log_stp", &log_stp);
  378 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW,
  379     &log_stp, 0, "Log STP state changes");
  380 TUNABLE_INT("net.link.bridge.inherit_mac", &bridge_inherit_mac);
  381 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW,
  382     &bridge_inherit_mac, 0,
  383     "Inherit MAC address from the first bridge member");
  384 
  385 static VNET_DEFINE(int, allow_llz_overlap) = 0;
  386 #define V_allow_llz_overlap     VNET(allow_llz_overlap)
  387 SYSCTL_VNET_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, CTLFLAG_RW,
  388     &VNET_NAME(allow_llz_overlap), 0, "Allow overlap of link-local scope "
  389     "zones of a bridge interface and the member interfaces");
  390 
  391 struct bridge_control {
  392         int     (*bc_func)(struct bridge_softc *, void *);
  393         int     bc_argsize;
  394         int     bc_flags;
  395 };
  396 
  397 #define BC_F_COPYIN             0x01    /* copy arguments in */
  398 #define BC_F_COPYOUT            0x02    /* copy arguments out */
  399 #define BC_F_SUSER              0x04    /* do super-user check */
  400 
  401 const struct bridge_control bridge_control_table[] = {
  402         { bridge_ioctl_add,             sizeof(struct ifbreq),
  403           BC_F_COPYIN|BC_F_SUSER },
  404         { bridge_ioctl_del,             sizeof(struct ifbreq),
  405           BC_F_COPYIN|BC_F_SUSER },
  406 
  407         { bridge_ioctl_gifflags,        sizeof(struct ifbreq),
  408           BC_F_COPYIN|BC_F_COPYOUT },
  409         { bridge_ioctl_sifflags,        sizeof(struct ifbreq),
  410           BC_F_COPYIN|BC_F_SUSER },
  411 
  412         { bridge_ioctl_scache,          sizeof(struct ifbrparam),
  413           BC_F_COPYIN|BC_F_SUSER },
  414         { bridge_ioctl_gcache,          sizeof(struct ifbrparam),
  415           BC_F_COPYOUT },
  416 
  417         { bridge_ioctl_gifs,            sizeof(struct ifbifconf),
  418           BC_F_COPYIN|BC_F_COPYOUT },
  419         { bridge_ioctl_rts,             sizeof(struct ifbaconf),
  420           BC_F_COPYIN|BC_F_COPYOUT },
  421 
  422         { bridge_ioctl_saddr,           sizeof(struct ifbareq),
  423           BC_F_COPYIN|BC_F_SUSER },
  424 
  425         { bridge_ioctl_sto,             sizeof(struct ifbrparam),
  426           BC_F_COPYIN|BC_F_SUSER },
  427         { bridge_ioctl_gto,             sizeof(struct ifbrparam),
  428           BC_F_COPYOUT },
  429 
  430         { bridge_ioctl_daddr,           sizeof(struct ifbareq),
  431           BC_F_COPYIN|BC_F_SUSER },
  432 
  433         { bridge_ioctl_flush,           sizeof(struct ifbreq),
  434           BC_F_COPYIN|BC_F_SUSER },
  435 
  436         { bridge_ioctl_gpri,            sizeof(struct ifbrparam),
  437           BC_F_COPYOUT },
  438         { bridge_ioctl_spri,            sizeof(struct ifbrparam),
  439           BC_F_COPYIN|BC_F_SUSER },
  440 
  441         { bridge_ioctl_ght,             sizeof(struct ifbrparam),
  442           BC_F_COPYOUT },
  443         { bridge_ioctl_sht,             sizeof(struct ifbrparam),
  444           BC_F_COPYIN|BC_F_SUSER },
  445 
  446         { bridge_ioctl_gfd,             sizeof(struct ifbrparam),
  447           BC_F_COPYOUT },
  448         { bridge_ioctl_sfd,             sizeof(struct ifbrparam),
  449           BC_F_COPYIN|BC_F_SUSER },
  450 
  451         { bridge_ioctl_gma,             sizeof(struct ifbrparam),
  452           BC_F_COPYOUT },
  453         { bridge_ioctl_sma,             sizeof(struct ifbrparam),
  454           BC_F_COPYIN|BC_F_SUSER },
  455 
  456         { bridge_ioctl_sifprio,         sizeof(struct ifbreq),
  457           BC_F_COPYIN|BC_F_SUSER },
  458 
  459         { bridge_ioctl_sifcost,         sizeof(struct ifbreq),
  460           BC_F_COPYIN|BC_F_SUSER },
  461 
  462         { bridge_ioctl_addspan,         sizeof(struct ifbreq),
  463           BC_F_COPYIN|BC_F_SUSER },
  464         { bridge_ioctl_delspan,         sizeof(struct ifbreq),
  465           BC_F_COPYIN|BC_F_SUSER },
  466 
  467         { bridge_ioctl_gbparam,         sizeof(struct ifbropreq),
  468           BC_F_COPYOUT },
  469 
  470         { bridge_ioctl_grte,            sizeof(struct ifbrparam),
  471           BC_F_COPYOUT },
  472 
  473         { bridge_ioctl_gifsstp,         sizeof(struct ifbpstpconf),
  474           BC_F_COPYIN|BC_F_COPYOUT },
  475 
  476         { bridge_ioctl_sproto,          sizeof(struct ifbrparam),
  477           BC_F_COPYIN|BC_F_SUSER },
  478 
  479         { bridge_ioctl_stxhc,           sizeof(struct ifbrparam),
  480           BC_F_COPYIN|BC_F_SUSER },
  481 
  482         { bridge_ioctl_sifmaxaddr,      sizeof(struct ifbreq),
  483           BC_F_COPYIN|BC_F_SUSER },
  484 
  485 };
  486 const int bridge_control_table_size =
  487     sizeof(bridge_control_table) / sizeof(bridge_control_table[0]);
  488 
  489 LIST_HEAD(, bridge_softc) bridge_list;
  490 
  491 static struct if_clone *bridge_cloner;
  492 static const char bridge_name[] = "bridge";
  493 
  494 static int
  495 bridge_modevent(module_t mod, int type, void *data)
  496 {
  497 
  498         switch (type) {
  499         case MOD_LOAD:
  500                 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF);
  501                 bridge_cloner = if_clone_simple(bridge_name,
  502                     bridge_clone_create, bridge_clone_destroy, 0);
  503                 bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
  504                     sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
  505                     UMA_ALIGN_PTR, 0);
  506                 LIST_INIT(&bridge_list);
  507                 bridge_input_p = bridge_input;
  508                 bridge_output_p = bridge_output;
  509                 bridge_dn_p = bridge_dummynet;
  510                 bridge_linkstate_p = bridge_linkstate;
  511                 bridge_detach_cookie = EVENTHANDLER_REGISTER(
  512                     ifnet_departure_event, bridge_ifdetach, NULL,
  513                     EVENTHANDLER_PRI_ANY);
  514                 break;
  515         case MOD_UNLOAD:
  516                 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
  517                     bridge_detach_cookie);
  518                 if_clone_detach(bridge_cloner);
  519                 uma_zdestroy(bridge_rtnode_zone);
  520                 bridge_input_p = NULL;
  521                 bridge_output_p = NULL;
  522                 bridge_dn_p = NULL;
  523                 bridge_linkstate_p = NULL;
  524                 mtx_destroy(&bridge_list_mtx);
  525                 break;
  526         default:
  527                 return (EOPNOTSUPP);
  528         }
  529         return (0);
  530 }
  531 
  532 static moduledata_t bridge_mod = {
  533         "if_bridge",
  534         bridge_modevent,
  535         0
  536 };
  537 
  538 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
  539 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
  540 
  541 /*
  542  * handler for net.link.bridge.ipfw
  543  */
  544 static int
  545 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
  546 {
  547         int enable = pfil_ipfw;
  548         int error;
  549 
  550         error = sysctl_handle_int(oidp, &enable, 0, req);
  551         enable = (enable) ? 1 : 0;
  552 
  553         if (enable != pfil_ipfw) {
  554                 pfil_ipfw = enable;
  555 
  556                 /*
  557                  * Disable pfil so that ipfw doesnt run twice, if the user
  558                  * really wants both then they can re-enable pfil_bridge and/or
  559                  * pfil_member. Also allow non-ip packets as ipfw can filter by
  560                  * layer2 type.
  561                  */
  562                 if (pfil_ipfw) {
  563                         pfil_onlyip = 0;
  564                         pfil_bridge = 0;
  565                         pfil_member = 0;
  566                 }
  567         }
  568 
  569         return (error);
  570 }
  571 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW,
  572             &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW");
  573 
  574 /*
  575  * bridge_clone_create:
  576  *
  577  *      Create a new bridge instance.
  578  */
  579 static int
  580 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
  581 {
  582         struct bridge_softc *sc, *sc2;
  583         struct ifnet *bifp, *ifp;
  584         int fb, retry;
  585         unsigned long hostid;
  586 
  587         sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
  588         ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
  589         if (ifp == NULL) {
  590                 free(sc, M_DEVBUF);
  591                 return (ENOSPC);
  592         }
  593 
  594         BRIDGE_LOCK_INIT(sc);
  595         sc->sc_brtmax = BRIDGE_RTABLE_MAX;
  596         sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
  597 
  598         /* Initialize our routing table. */
  599         bridge_rtable_init(sc);
  600 
  601         callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
  602 
  603         LIST_INIT(&sc->sc_iflist);
  604         LIST_INIT(&sc->sc_spanlist);
  605 
  606         ifp->if_softc = sc;
  607         if_initname(ifp, bridge_name, unit);
  608         ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
  609         ifp->if_ioctl = bridge_ioctl;
  610         ifp->if_transmit = bridge_transmit;
  611         ifp->if_qflush = bridge_qflush;
  612         ifp->if_init = bridge_init;
  613         ifp->if_type = IFT_BRIDGE;
  614 
  615         /*
  616          * Generate an ethernet address with a locally administered address.
  617          *
  618          * Since we are using random ethernet addresses for the bridge, it is
  619          * possible that we might have address collisions, so make sure that
  620          * this hardware address isn't already in use on another bridge.
  621          * The first try uses the hostid and falls back to arc4rand().
  622          */
  623         fb = 0;
  624         getcredhostid(curthread->td_ucred, &hostid);
  625         do {
  626                 if (fb || hostid == 0) {
  627                         arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1);
  628                         sc->sc_defaddr[0] &= ~1;/* clear multicast bit */
  629                         sc->sc_defaddr[0] |= 2; /* set the LAA bit */
  630                 } else {
  631                         sc->sc_defaddr[0] = 0x2;
  632                         sc->sc_defaddr[1] = (hostid >> 24) & 0xff;
  633                         sc->sc_defaddr[2] = (hostid >> 16) & 0xff;
  634                         sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff;
  635                         sc->sc_defaddr[4] =  hostid        & 0xff;
  636                         sc->sc_defaddr[5] = ifp->if_dunit & 0xff;
  637                 }
  638 
  639                 fb = 1;
  640                 retry = 0;
  641                 mtx_lock(&bridge_list_mtx);
  642                 LIST_FOREACH(sc2, &bridge_list, sc_list) {
  643                         bifp = sc2->sc_ifp;
  644                         if (memcmp(sc->sc_defaddr,
  645                             IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) {
  646                                 retry = 1;
  647                                 break;
  648                         }
  649                 }
  650                 mtx_unlock(&bridge_list_mtx);
  651         } while (retry == 1);
  652 
  653         bstp_attach(&sc->sc_stp, &bridge_ops);
  654         ether_ifattach(ifp, sc->sc_defaddr);
  655         /* Now undo some of the damage... */
  656         ifp->if_baudrate = 0;
  657         ifp->if_type = IFT_BRIDGE;
  658 
  659         mtx_lock(&bridge_list_mtx);
  660         LIST_INSERT_HEAD(&bridge_list, sc, sc_list);
  661         mtx_unlock(&bridge_list_mtx);
  662 
  663         return (0);
  664 }
  665 
  666 /*
  667  * bridge_clone_destroy:
  668  *
  669  *      Destroy a bridge instance.
  670  */
  671 static void
  672 bridge_clone_destroy(struct ifnet *ifp)
  673 {
  674         struct bridge_softc *sc = ifp->if_softc;
  675         struct bridge_iflist *bif;
  676 
  677         BRIDGE_LOCK(sc);
  678 
  679         bridge_stop(ifp, 1);
  680         ifp->if_flags &= ~IFF_UP;
  681 
  682         while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
  683                 bridge_delete_member(sc, bif, 0);
  684 
  685         while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
  686                 bridge_delete_span(sc, bif);
  687         }
  688 
  689         BRIDGE_UNLOCK(sc);
  690 
  691         callout_drain(&sc->sc_brcallout);
  692 
  693         mtx_lock(&bridge_list_mtx);
  694         LIST_REMOVE(sc, sc_list);
  695         mtx_unlock(&bridge_list_mtx);
  696 
  697         bstp_detach(&sc->sc_stp);
  698         ether_ifdetach(ifp);
  699         if_free(ifp);
  700 
  701         /* Tear down the routing table. */
  702         bridge_rtable_fini(sc);
  703 
  704         BRIDGE_LOCK_DESTROY(sc);
  705         free(sc, M_DEVBUF);
  706 }
  707 
  708 /*
  709  * bridge_ioctl:
  710  *
  711  *      Handle a control request from the operator.
  712  */
  713 static int
  714 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
  715 {
  716         struct bridge_softc *sc = ifp->if_softc;
  717         struct ifreq *ifr = (struct ifreq *)data;
  718         struct bridge_iflist *bif;
  719         struct thread *td = curthread;
  720         union {
  721                 struct ifbreq ifbreq;
  722                 struct ifbifconf ifbifconf;
  723                 struct ifbareq ifbareq;
  724                 struct ifbaconf ifbaconf;
  725                 struct ifbrparam ifbrparam;
  726                 struct ifbropreq ifbropreq;
  727         } args;
  728         struct ifdrv *ifd = (struct ifdrv *) data;
  729         const struct bridge_control *bc;
  730         int error = 0;
  731 
  732         switch (cmd) {
  733 
  734         case SIOCADDMULTI:
  735         case SIOCDELMULTI:
  736                 break;
  737 
  738         case SIOCGDRVSPEC:
  739         case SIOCSDRVSPEC:
  740                 if (ifd->ifd_cmd >= bridge_control_table_size) {
  741                         error = EINVAL;
  742                         break;
  743                 }
  744                 bc = &bridge_control_table[ifd->ifd_cmd];
  745 
  746                 if (cmd == SIOCGDRVSPEC &&
  747                     (bc->bc_flags & BC_F_COPYOUT) == 0) {
  748                         error = EINVAL;
  749                         break;
  750                 }
  751                 else if (cmd == SIOCSDRVSPEC &&
  752                     (bc->bc_flags & BC_F_COPYOUT) != 0) {
  753                         error = EINVAL;
  754                         break;
  755                 }
  756 
  757                 if (bc->bc_flags & BC_F_SUSER) {
  758                         error = priv_check(td, PRIV_NET_BRIDGE);
  759                         if (error)
  760                                 break;
  761                 }
  762 
  763                 if (ifd->ifd_len != bc->bc_argsize ||
  764                     ifd->ifd_len > sizeof(args)) {
  765                         error = EINVAL;
  766                         break;
  767                 }
  768 
  769                 bzero(&args, sizeof(args));
  770                 if (bc->bc_flags & BC_F_COPYIN) {
  771                         error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
  772                         if (error)
  773                                 break;
  774                 }
  775 
  776                 BRIDGE_LOCK(sc);
  777                 error = (*bc->bc_func)(sc, &args);
  778                 BRIDGE_UNLOCK(sc);
  779                 if (error)
  780                         break;
  781 
  782                 if (bc->bc_flags & BC_F_COPYOUT)
  783                         error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
  784 
  785                 break;
  786 
  787         case SIOCSIFFLAGS:
  788                 if (!(ifp->if_flags & IFF_UP) &&
  789                     (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
  790                         /*
  791                          * If interface is marked down and it is running,
  792                          * then stop and disable it.
  793                          */
  794                         BRIDGE_LOCK(sc);
  795                         bridge_stop(ifp, 1);
  796                         BRIDGE_UNLOCK(sc);
  797                 } else if ((ifp->if_flags & IFF_UP) &&
  798                     !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
  799                         /*
  800                          * If interface is marked up and it is stopped, then
  801                          * start it.
  802                          */
  803                         (*ifp->if_init)(sc);
  804                 }
  805                 break;
  806 
  807         case SIOCSIFMTU:
  808                 if (ifr->ifr_mtu < 576) {
  809                         error = EINVAL;
  810                         break;
  811                 }
  812                 if (LIST_EMPTY(&sc->sc_iflist)) {
  813                         sc->sc_ifp->if_mtu = ifr->ifr_mtu;
  814                         break;
  815                 }
  816                 BRIDGE_LOCK(sc);
  817                 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
  818                         if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) {
  819                                 log(LOG_NOTICE, "%s: invalid MTU: %lu(%s)"
  820                                     " != %d\n", sc->sc_ifp->if_xname,
  821                                     bif->bif_ifp->if_mtu,
  822                                     bif->bif_ifp->if_xname, ifr->ifr_mtu);
  823                                 error = EINVAL;
  824                                 break;
  825                         }
  826                 }
  827                 if (!error)
  828                         sc->sc_ifp->if_mtu = ifr->ifr_mtu;
  829                 BRIDGE_UNLOCK(sc);
  830                 break;
  831         default:
  832                 /*
  833                  * drop the lock as ether_ioctl() will call bridge_start() and
  834                  * cause the lock to be recursed.
  835                  */
  836                 error = ether_ioctl(ifp, cmd, data);
  837                 break;
  838         }
  839 
  840         return (error);
  841 }
  842 
  843 /*
  844  * bridge_mutecaps:
  845  *
  846  *      Clear or restore unwanted capabilities on the member interface
  847  */
  848 static void
  849 bridge_mutecaps(struct bridge_softc *sc)
  850 {
  851         struct bridge_iflist *bif;
  852         int enabled, mask;
  853 
  854         /* Initial bitmask of capabilities to test */
  855         mask = BRIDGE_IFCAPS_MASK;
  856 
  857         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
  858                 /* Every member must support it or its disabled */
  859                 mask &= bif->bif_savedcaps;
  860         }
  861 
  862         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
  863                 enabled = bif->bif_ifp->if_capenable;
  864                 enabled &= ~BRIDGE_IFCAPS_STRIP;
  865                 /* strip off mask bits and enable them again if allowed */
  866                 enabled &= ~BRIDGE_IFCAPS_MASK;
  867                 enabled |= mask;
  868                 bridge_set_ifcap(sc, bif, enabled);
  869         }
  870 
  871 }
  872 
  873 static void
  874 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
  875 {
  876         struct ifnet *ifp = bif->bif_ifp;
  877         struct ifreq ifr;
  878         int error;
  879 
  880         bzero(&ifr, sizeof(ifr));
  881         ifr.ifr_reqcap = set;
  882 
  883         if (ifp->if_capenable != set) {
  884                 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
  885                 if (error)
  886                         if_printf(sc->sc_ifp,
  887                             "error setting interface capabilities on %s\n",
  888                             ifp->if_xname);
  889         }
  890 }
  891 
  892 /*
  893  * bridge_lookup_member:
  894  *
  895  *      Lookup a bridge member interface.
  896  */
  897 static struct bridge_iflist *
  898 bridge_lookup_member(struct bridge_softc *sc, const char *name)
  899 {
  900         struct bridge_iflist *bif;
  901         struct ifnet *ifp;
  902 
  903         BRIDGE_LOCK_ASSERT(sc);
  904 
  905         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
  906                 ifp = bif->bif_ifp;
  907                 if (strcmp(ifp->if_xname, name) == 0)
  908                         return (bif);
  909         }
  910 
  911         return (NULL);
  912 }
  913 
  914 /*
  915  * bridge_lookup_member_if:
  916  *
  917  *      Lookup a bridge member interface by ifnet*.
  918  */
  919 static struct bridge_iflist *
  920 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
  921 {
  922         struct bridge_iflist *bif;
  923 
  924         BRIDGE_LOCK_ASSERT(sc);
  925 
  926         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
  927                 if (bif->bif_ifp == member_ifp)
  928                         return (bif);
  929         }
  930 
  931         return (NULL);
  932 }
  933 
  934 /*
  935  * bridge_delete_member:
  936  *
  937  *      Delete the specified member interface.
  938  */
  939 static void
  940 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
  941     int gone)
  942 {
  943         struct ifnet *ifs = bif->bif_ifp;
  944         struct ifnet *fif = NULL;
  945 
  946         BRIDGE_LOCK_ASSERT(sc);
  947 
  948         if (bif->bif_flags & IFBIF_STP)
  949                 bstp_disable(&bif->bif_stp);
  950 
  951         ifs->if_bridge = NULL;
  952         BRIDGE_XLOCK(sc);
  953         LIST_REMOVE(bif, bif_next);
  954         BRIDGE_XDROP(sc);
  955 
  956         /*
  957          * If removing the interface that gave the bridge its mac address, set
  958          * the mac address of the bridge to the address of the next member, or
  959          * to its default address if no members are left.
  960          */
  961         if (bridge_inherit_mac && sc->sc_ifaddr == ifs) {
  962                 if (LIST_EMPTY(&sc->sc_iflist)) {
  963                         bcopy(sc->sc_defaddr,
  964                             IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
  965                         sc->sc_ifaddr = NULL;
  966                 } else {
  967                         fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp;
  968                         bcopy(IF_LLADDR(fif),
  969                             IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
  970                         sc->sc_ifaddr = fif;
  971                 }
  972                 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
  973         }
  974 
  975         bridge_linkcheck(sc);
  976         bridge_mutecaps(sc);    /* recalcuate now this interface is removed */
  977         bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
  978         KASSERT(bif->bif_addrcnt == 0,
  979             ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
  980 
  981         BRIDGE_UNLOCK(sc);
  982         if (!gone) {
  983                 switch (ifs->if_type) {
  984                 case IFT_ETHER:
  985                 case IFT_L2VLAN:
  986                         /*
  987                          * Take the interface out of promiscuous mode.
  988                          */
  989                         (void) ifpromisc(ifs, 0);
  990                         break;
  991 
  992                 case IFT_GIF:
  993                         break;
  994 
  995                 default:
  996 #ifdef DIAGNOSTIC
  997                         panic("bridge_delete_member: impossible");
  998 #endif
  999                         break;
 1000                 }
 1001                 /* reneable any interface capabilities */
 1002                 bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
 1003         }
 1004         bstp_destroy(&bif->bif_stp);    /* prepare to free */
 1005         BRIDGE_LOCK(sc);
 1006         free(bif, M_DEVBUF);
 1007 }
 1008 
 1009 /*
 1010  * bridge_delete_span:
 1011  *
 1012  *      Delete the specified span interface.
 1013  */
 1014 static void
 1015 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
 1016 {
 1017         BRIDGE_LOCK_ASSERT(sc);
 1018 
 1019         KASSERT(bif->bif_ifp->if_bridge == NULL,
 1020             ("%s: not a span interface", __func__));
 1021 
 1022         LIST_REMOVE(bif, bif_next);
 1023         free(bif, M_DEVBUF);
 1024 }
 1025 
 1026 static int
 1027 bridge_ioctl_add(struct bridge_softc *sc, void *arg)
 1028 {
 1029         struct ifbreq *req = arg;
 1030         struct bridge_iflist *bif = NULL;
 1031         struct ifnet *ifs;
 1032         int error = 0;
 1033 
 1034         ifs = ifunit(req->ifbr_ifsname);
 1035         if (ifs == NULL)
 1036                 return (ENOENT);
 1037         if (ifs->if_ioctl == NULL)      /* must be supported */
 1038                 return (EINVAL);
 1039 
 1040         /* If it's in the span list, it can't be a member. */
 1041         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
 1042                 if (ifs == bif->bif_ifp)
 1043                         return (EBUSY);
 1044 
 1045         if (ifs->if_bridge == sc)
 1046                 return (EEXIST);
 1047 
 1048         if (ifs->if_bridge != NULL)
 1049                 return (EBUSY);
 1050 
 1051         switch (ifs->if_type) {
 1052         case IFT_ETHER:
 1053         case IFT_L2VLAN:
 1054         case IFT_GIF:
 1055                 /* permitted interface types */
 1056                 break;
 1057         default:
 1058                 return (EINVAL);
 1059         }
 1060 
 1061 #ifdef INET6
 1062         /*
 1063          * Two valid inet6 addresses with link-local scope must not be
 1064          * on the parent interface and the member interfaces at the
 1065          * same time.  This restriction is needed to prevent violation
 1066          * of link-local scope zone.  Attempts to add a member
 1067          * interface which has inet6 addresses when the parent has
 1068          * inet6 triggers removal of all inet6 addresses on the member
 1069          * interface.
 1070          */
 1071 
 1072         /* Check if the parent interface has a link-local scope addr. */
 1073         if (V_allow_llz_overlap == 0 &&
 1074             in6ifa_llaonifp(sc->sc_ifp) != NULL) {
 1075                 /*
 1076                  * If any, remove all inet6 addresses from the member
 1077                  * interfaces.
 1078                  */
 1079                 BRIDGE_XLOCK(sc);
 1080                 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 1081                         if (in6ifa_llaonifp(bif->bif_ifp)) {
 1082                                 BRIDGE_UNLOCK(sc);
 1083                                 in6_ifdetach(bif->bif_ifp);
 1084                                 BRIDGE_LOCK(sc);
 1085                                 if_printf(sc->sc_ifp,
 1086                                     "IPv6 addresses on %s have been removed "
 1087                                     "before adding it as a member to prevent "
 1088                                     "IPv6 address scope violation.\n",
 1089                                     bif->bif_ifp->if_xname);
 1090                         }
 1091                 }
 1092                 BRIDGE_XDROP(sc);
 1093                 if (in6ifa_llaonifp(ifs)) {
 1094                         BRIDGE_UNLOCK(sc);
 1095                         in6_ifdetach(ifs);
 1096                         BRIDGE_LOCK(sc);
 1097                         if_printf(sc->sc_ifp,
 1098                             "IPv6 addresses on %s have been removed "
 1099                             "before adding it as a member to prevent "
 1100                             "IPv6 address scope violation.\n",
 1101                             ifs->if_xname);
 1102                 }
 1103         }
 1104 #endif
 1105         /* Allow the first Ethernet member to define the MTU */
 1106         if (LIST_EMPTY(&sc->sc_iflist))
 1107                 sc->sc_ifp->if_mtu = ifs->if_mtu;
 1108         else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
 1109                 if_printf(sc->sc_ifp, "invalid MTU: %lu(%s) != %lu\n",
 1110                     ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu);
 1111                 return (EINVAL);
 1112         }
 1113 
 1114         bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
 1115         if (bif == NULL)
 1116                 return (ENOMEM);
 1117 
 1118         bif->bif_ifp = ifs;
 1119         bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
 1120         bif->bif_savedcaps = ifs->if_capenable;
 1121 
 1122         /*
 1123          * Assign the interface's MAC address to the bridge if it's the first
 1124          * member and the MAC address of the bridge has not been changed from
 1125          * the default randomly generated one.
 1126          */
 1127         if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) &&
 1128             !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) {
 1129                 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
 1130                 sc->sc_ifaddr = ifs;
 1131                 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
 1132         }
 1133 
 1134         ifs->if_bridge = sc;
 1135         bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
 1136         /*
 1137          * XXX: XLOCK HERE!?!
 1138          *
 1139          * NOTE: insert_***HEAD*** should be safe for the traversals.
 1140          */
 1141         LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
 1142 
 1143         /* Set interface capabilities to the intersection set of all members */
 1144         bridge_mutecaps(sc);
 1145         bridge_linkcheck(sc);
 1146 
 1147         /* Place the interface into promiscuous mode */
 1148         switch (ifs->if_type) {
 1149                 case IFT_ETHER:
 1150                 case IFT_L2VLAN:
 1151                         BRIDGE_UNLOCK(sc);
 1152                         error = ifpromisc(ifs, 1);
 1153                         BRIDGE_LOCK(sc);
 1154                         break;
 1155         }
 1156 
 1157         if (error) {
 1158                 bridge_delete_member(sc, bif, 0);
 1159                 free(bif, M_DEVBUF);
 1160         }
 1161         return (error);
 1162 }
 1163 
 1164 static int
 1165 bridge_ioctl_del(struct bridge_softc *sc, void *arg)
 1166 {
 1167         struct ifbreq *req = arg;
 1168         struct bridge_iflist *bif;
 1169 
 1170         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
 1171         if (bif == NULL)
 1172                 return (ENOENT);
 1173 
 1174         bridge_delete_member(sc, bif, 0);
 1175 
 1176         return (0);
 1177 }
 1178 
 1179 static int
 1180 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
 1181 {
 1182         struct ifbreq *req = arg;
 1183         struct bridge_iflist *bif;
 1184         struct bstp_port *bp;
 1185 
 1186         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
 1187         if (bif == NULL)
 1188                 return (ENOENT);
 1189 
 1190         bp = &bif->bif_stp;
 1191         req->ifbr_ifsflags = bif->bif_flags;
 1192         req->ifbr_state = bp->bp_state;
 1193         req->ifbr_priority = bp->bp_priority;
 1194         req->ifbr_path_cost = bp->bp_path_cost;
 1195         req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
 1196         req->ifbr_proto = bp->bp_protover;
 1197         req->ifbr_role = bp->bp_role;
 1198         req->ifbr_stpflags = bp->bp_flags;
 1199         req->ifbr_addrcnt = bif->bif_addrcnt;
 1200         req->ifbr_addrmax = bif->bif_addrmax;
 1201         req->ifbr_addrexceeded = bif->bif_addrexceeded;
 1202 
 1203         /* Copy STP state options as flags */
 1204         if (bp->bp_operedge)
 1205                 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
 1206         if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
 1207                 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
 1208         if (bp->bp_ptp_link)
 1209                 req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
 1210         if (bp->bp_flags & BSTP_PORT_AUTOPTP)
 1211                 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
 1212         if (bp->bp_flags & BSTP_PORT_ADMEDGE)
 1213                 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
 1214         if (bp->bp_flags & BSTP_PORT_ADMCOST)
 1215                 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
 1216         return (0);
 1217 }
 1218 
 1219 static int
 1220 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
 1221 {
 1222         struct ifbreq *req = arg;
 1223         struct bridge_iflist *bif;
 1224         struct bstp_port *bp;
 1225         int error;
 1226 
 1227         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
 1228         if (bif == NULL)
 1229                 return (ENOENT);
 1230         bp = &bif->bif_stp;
 1231 
 1232         if (req->ifbr_ifsflags & IFBIF_SPAN)
 1233                 /* SPAN is readonly */
 1234                 return (EINVAL);
 1235 
 1236         if (req->ifbr_ifsflags & IFBIF_STP) {
 1237                 if ((bif->bif_flags & IFBIF_STP) == 0) {
 1238                         error = bstp_enable(&bif->bif_stp);
 1239                         if (error)
 1240                                 return (error);
 1241                 }
 1242         } else {
 1243                 if ((bif->bif_flags & IFBIF_STP) != 0)
 1244                         bstp_disable(&bif->bif_stp);
 1245         }
 1246 
 1247         /* Pass on STP flags */
 1248         bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
 1249         bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
 1250         bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
 1251         bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
 1252 
 1253         /* Save the bits relating to the bridge */
 1254         bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
 1255 
 1256         return (0);
 1257 }
 1258 
 1259 static int
 1260 bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
 1261 {
 1262         struct ifbrparam *param = arg;
 1263 
 1264         sc->sc_brtmax = param->ifbrp_csize;
 1265         bridge_rttrim(sc);
 1266 
 1267         return (0);
 1268 }
 1269 
 1270 static int
 1271 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
 1272 {
 1273         struct ifbrparam *param = arg;
 1274 
 1275         param->ifbrp_csize = sc->sc_brtmax;
 1276 
 1277         return (0);
 1278 }
 1279 
 1280 static int
 1281 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
 1282 {
 1283         struct ifbifconf *bifc = arg;
 1284         struct bridge_iflist *bif;
 1285         struct ifbreq breq;
 1286         char *buf, *outbuf;
 1287         int count, buflen, len, error = 0;
 1288 
 1289         count = 0;
 1290         LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
 1291                 count++;
 1292         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
 1293                 count++;
 1294 
 1295         buflen = sizeof(breq) * count;
 1296         if (bifc->ifbic_len == 0) {
 1297                 bifc->ifbic_len = buflen;
 1298                 return (0);
 1299         }
 1300         BRIDGE_UNLOCK(sc);
 1301         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
 1302         BRIDGE_LOCK(sc);
 1303 
 1304         count = 0;
 1305         buf = outbuf;
 1306         len = min(bifc->ifbic_len, buflen);
 1307         bzero(&breq, sizeof(breq));
 1308         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 1309                 if (len < sizeof(breq))
 1310                         break;
 1311 
 1312                 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
 1313                     sizeof(breq.ifbr_ifsname));
 1314                 /* Fill in the ifbreq structure */
 1315                 error = bridge_ioctl_gifflags(sc, &breq);
 1316                 if (error)
 1317                         break;
 1318                 memcpy(buf, &breq, sizeof(breq));
 1319                 count++;
 1320                 buf += sizeof(breq);
 1321                 len -= sizeof(breq);
 1322         }
 1323         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
 1324                 if (len < sizeof(breq))
 1325                         break;
 1326 
 1327                 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
 1328                     sizeof(breq.ifbr_ifsname));
 1329                 breq.ifbr_ifsflags = bif->bif_flags;
 1330                 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff;
 1331                 memcpy(buf, &breq, sizeof(breq));
 1332                 count++;
 1333                 buf += sizeof(breq);
 1334                 len -= sizeof(breq);
 1335         }
 1336 
 1337         BRIDGE_UNLOCK(sc);
 1338         bifc->ifbic_len = sizeof(breq) * count;
 1339         error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
 1340         BRIDGE_LOCK(sc);
 1341         free(outbuf, M_TEMP);
 1342         return (error);
 1343 }
 1344 
 1345 static int
 1346 bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
 1347 {
 1348         struct ifbaconf *bac = arg;
 1349         struct bridge_rtnode *brt;
 1350         struct ifbareq bareq;
 1351         char *buf, *outbuf;
 1352         int count, buflen, len, error = 0;
 1353 
 1354         if (bac->ifbac_len == 0)
 1355                 return (0);
 1356 
 1357         count = 0;
 1358         LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
 1359                 count++;
 1360         buflen = sizeof(bareq) * count;
 1361 
 1362         BRIDGE_UNLOCK(sc);
 1363         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
 1364         BRIDGE_LOCK(sc);
 1365 
 1366         count = 0;
 1367         buf = outbuf;
 1368         len = min(bac->ifbac_len, buflen);
 1369         bzero(&bareq, sizeof(bareq));
 1370         LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
 1371                 if (len < sizeof(bareq))
 1372                         goto out;
 1373                 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
 1374                     sizeof(bareq.ifba_ifsname));
 1375                 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
 1376                 bareq.ifba_vlan = brt->brt_vlan;
 1377                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
 1378                                 time_uptime < brt->brt_expire)
 1379                         bareq.ifba_expire = brt->brt_expire - time_uptime;
 1380                 else
 1381                         bareq.ifba_expire = 0;
 1382                 bareq.ifba_flags = brt->brt_flags;
 1383 
 1384                 memcpy(buf, &bareq, sizeof(bareq));
 1385                 count++;
 1386                 buf += sizeof(bareq);
 1387                 len -= sizeof(bareq);
 1388         }
 1389 out:
 1390         BRIDGE_UNLOCK(sc);
 1391         bac->ifbac_len = sizeof(bareq) * count;
 1392         error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
 1393         BRIDGE_LOCK(sc);
 1394         free(outbuf, M_TEMP);
 1395         return (error);
 1396 }
 1397 
 1398 static int
 1399 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
 1400 {
 1401         struct ifbareq *req = arg;
 1402         struct bridge_iflist *bif;
 1403         int error;
 1404 
 1405         bif = bridge_lookup_member(sc, req->ifba_ifsname);
 1406         if (bif == NULL)
 1407                 return (ENOENT);
 1408 
 1409         error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1,
 1410             req->ifba_flags);
 1411 
 1412         return (error);
 1413 }
 1414 
 1415 static int
 1416 bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
 1417 {
 1418         struct ifbrparam *param = arg;
 1419 
 1420         sc->sc_brttimeout = param->ifbrp_ctime;
 1421         return (0);
 1422 }
 1423 
 1424 static int
 1425 bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
 1426 {
 1427         struct ifbrparam *param = arg;
 1428 
 1429         param->ifbrp_ctime = sc->sc_brttimeout;
 1430         return (0);
 1431 }
 1432 
 1433 static int
 1434 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
 1435 {
 1436         struct ifbareq *req = arg;
 1437 
 1438         return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan));
 1439 }
 1440 
 1441 static int
 1442 bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
 1443 {
 1444         struct ifbreq *req = arg;
 1445 
 1446         bridge_rtflush(sc, req->ifbr_ifsflags);
 1447         return (0);
 1448 }
 1449 
 1450 static int
 1451 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
 1452 {
 1453         struct ifbrparam *param = arg;
 1454         struct bstp_state *bs = &sc->sc_stp;
 1455 
 1456         param->ifbrp_prio = bs->bs_bridge_priority;
 1457         return (0);
 1458 }
 1459 
 1460 static int
 1461 bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
 1462 {
 1463         struct ifbrparam *param = arg;
 1464 
 1465         return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
 1466 }
 1467 
 1468 static int
 1469 bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
 1470 {
 1471         struct ifbrparam *param = arg;
 1472         struct bstp_state *bs = &sc->sc_stp;
 1473 
 1474         param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
 1475         return (0);
 1476 }
 1477 
 1478 static int
 1479 bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
 1480 {
 1481         struct ifbrparam *param = arg;
 1482 
 1483         return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
 1484 }
 1485 
 1486 static int
 1487 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
 1488 {
 1489         struct ifbrparam *param = arg;
 1490         struct bstp_state *bs = &sc->sc_stp;
 1491 
 1492         param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
 1493         return (0);
 1494 }
 1495 
 1496 static int
 1497 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
 1498 {
 1499         struct ifbrparam *param = arg;
 1500 
 1501         return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
 1502 }
 1503 
 1504 static int
 1505 bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
 1506 {
 1507         struct ifbrparam *param = arg;
 1508         struct bstp_state *bs = &sc->sc_stp;
 1509 
 1510         param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
 1511         return (0);
 1512 }
 1513 
 1514 static int
 1515 bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
 1516 {
 1517         struct ifbrparam *param = arg;
 1518 
 1519         return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
 1520 }
 1521 
 1522 static int
 1523 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
 1524 {
 1525         struct ifbreq *req = arg;
 1526         struct bridge_iflist *bif;
 1527 
 1528         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
 1529         if (bif == NULL)
 1530                 return (ENOENT);
 1531 
 1532         return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
 1533 }
 1534 
 1535 static int
 1536 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
 1537 {
 1538         struct ifbreq *req = arg;
 1539         struct bridge_iflist *bif;
 1540 
 1541         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
 1542         if (bif == NULL)
 1543                 return (ENOENT);
 1544 
 1545         return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
 1546 }
 1547 
 1548 static int
 1549 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg)
 1550 {
 1551         struct ifbreq *req = arg;
 1552         struct bridge_iflist *bif;
 1553 
 1554         bif = bridge_lookup_member(sc, req->ifbr_ifsname);
 1555         if (bif == NULL)
 1556                 return (ENOENT);
 1557 
 1558         bif->bif_addrmax = req->ifbr_addrmax;
 1559         return (0);
 1560 }
 1561 
 1562 static int
 1563 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
 1564 {
 1565         struct ifbreq *req = arg;
 1566         struct bridge_iflist *bif = NULL;
 1567         struct ifnet *ifs;
 1568 
 1569         ifs = ifunit(req->ifbr_ifsname);
 1570         if (ifs == NULL)
 1571                 return (ENOENT);
 1572 
 1573         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
 1574                 if (ifs == bif->bif_ifp)
 1575                         return (EBUSY);
 1576 
 1577         if (ifs->if_bridge != NULL)
 1578                 return (EBUSY);
 1579 
 1580         switch (ifs->if_type) {
 1581                 case IFT_ETHER:
 1582                 case IFT_GIF:
 1583                 case IFT_L2VLAN:
 1584                         break;
 1585                 default:
 1586                         return (EINVAL);
 1587         }
 1588 
 1589         bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
 1590         if (bif == NULL)
 1591                 return (ENOMEM);
 1592 
 1593         bif->bif_ifp = ifs;
 1594         bif->bif_flags = IFBIF_SPAN;
 1595 
 1596         LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
 1597 
 1598         return (0);
 1599 }
 1600 
 1601 static int
 1602 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
 1603 {
 1604         struct ifbreq *req = arg;
 1605         struct bridge_iflist *bif;
 1606         struct ifnet *ifs;
 1607 
 1608         ifs = ifunit(req->ifbr_ifsname);
 1609         if (ifs == NULL)
 1610                 return (ENOENT);
 1611 
 1612         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
 1613                 if (ifs == bif->bif_ifp)
 1614                         break;
 1615 
 1616         if (bif == NULL)
 1617                 return (ENOENT);
 1618 
 1619         bridge_delete_span(sc, bif);
 1620 
 1621         return (0);
 1622 }
 1623 
 1624 static int
 1625 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
 1626 {
 1627         struct ifbropreq *req = arg;
 1628         struct bstp_state *bs = &sc->sc_stp;
 1629         struct bstp_port *root_port;
 1630 
 1631         req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
 1632         req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
 1633         req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
 1634 
 1635         root_port = bs->bs_root_port;
 1636         if (root_port == NULL)
 1637                 req->ifbop_root_port = 0;
 1638         else
 1639                 req->ifbop_root_port = root_port->bp_ifp->if_index;
 1640 
 1641         req->ifbop_holdcount = bs->bs_txholdcount;
 1642         req->ifbop_priority = bs->bs_bridge_priority;
 1643         req->ifbop_protocol = bs->bs_protover;
 1644         req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
 1645         req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
 1646         req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
 1647         req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
 1648         req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
 1649         req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
 1650 
 1651         return (0);
 1652 }
 1653 
 1654 static int
 1655 bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
 1656 {
 1657         struct ifbrparam *param = arg;
 1658 
 1659         param->ifbrp_cexceeded = sc->sc_brtexceeded;
 1660         return (0);
 1661 }
 1662 
 1663 static int
 1664 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
 1665 {
 1666         struct ifbpstpconf *bifstp = arg;
 1667         struct bridge_iflist *bif;
 1668         struct bstp_port *bp;
 1669         struct ifbpstpreq bpreq;
 1670         char *buf, *outbuf;
 1671         int count, buflen, len, error = 0;
 1672 
 1673         count = 0;
 1674         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 1675                 if ((bif->bif_flags & IFBIF_STP) != 0)
 1676                         count++;
 1677         }
 1678 
 1679         buflen = sizeof(bpreq) * count;
 1680         if (bifstp->ifbpstp_len == 0) {
 1681                 bifstp->ifbpstp_len = buflen;
 1682                 return (0);
 1683         }
 1684 
 1685         BRIDGE_UNLOCK(sc);
 1686         outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
 1687         BRIDGE_LOCK(sc);
 1688 
 1689         count = 0;
 1690         buf = outbuf;
 1691         len = min(bifstp->ifbpstp_len, buflen);
 1692         bzero(&bpreq, sizeof(bpreq));
 1693         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 1694                 if (len < sizeof(bpreq))
 1695                         break;
 1696 
 1697                 if ((bif->bif_flags & IFBIF_STP) == 0)
 1698                         continue;
 1699 
 1700                 bp = &bif->bif_stp;
 1701                 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
 1702                 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
 1703                 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
 1704                 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
 1705                 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
 1706                 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
 1707 
 1708                 memcpy(buf, &bpreq, sizeof(bpreq));
 1709                 count++;
 1710                 buf += sizeof(bpreq);
 1711                 len -= sizeof(bpreq);
 1712         }
 1713 
 1714         BRIDGE_UNLOCK(sc);
 1715         bifstp->ifbpstp_len = sizeof(bpreq) * count;
 1716         error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
 1717         BRIDGE_LOCK(sc);
 1718         free(outbuf, M_TEMP);
 1719         return (error);
 1720 }
 1721 
 1722 static int
 1723 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
 1724 {
 1725         struct ifbrparam *param = arg;
 1726 
 1727         return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
 1728 }
 1729 
 1730 static int
 1731 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
 1732 {
 1733         struct ifbrparam *param = arg;
 1734 
 1735         return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
 1736 }
 1737 
 1738 /*
 1739  * bridge_ifdetach:
 1740  *
 1741  *      Detach an interface from a bridge.  Called when a member
 1742  *      interface is detaching.
 1743  */
 1744 static void
 1745 bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
 1746 {
 1747         struct bridge_softc *sc = ifp->if_bridge;
 1748         struct bridge_iflist *bif;
 1749 
 1750         if (ifp->if_flags & IFF_RENAMING)
 1751                 return;
 1752 
 1753         /* Check if the interface is a bridge member */
 1754         if (sc != NULL) {
 1755                 BRIDGE_LOCK(sc);
 1756 
 1757                 bif = bridge_lookup_member_if(sc, ifp);
 1758                 if (bif != NULL)
 1759                         bridge_delete_member(sc, bif, 1);
 1760 
 1761                 BRIDGE_UNLOCK(sc);
 1762                 return;
 1763         }
 1764 
 1765         /* Check if the interface is a span port */
 1766         mtx_lock(&bridge_list_mtx);
 1767         LIST_FOREACH(sc, &bridge_list, sc_list) {
 1768                 BRIDGE_LOCK(sc);
 1769                 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
 1770                         if (ifp == bif->bif_ifp) {
 1771                                 bridge_delete_span(sc, bif);
 1772                                 break;
 1773                         }
 1774 
 1775                 BRIDGE_UNLOCK(sc);
 1776         }
 1777         mtx_unlock(&bridge_list_mtx);
 1778 }
 1779 
 1780 /*
 1781  * bridge_init:
 1782  *
 1783  *      Initialize a bridge interface.
 1784  */
 1785 static void
 1786 bridge_init(void *xsc)
 1787 {
 1788         struct bridge_softc *sc = (struct bridge_softc *)xsc;
 1789         struct ifnet *ifp = sc->sc_ifp;
 1790 
 1791         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
 1792                 return;
 1793 
 1794         BRIDGE_LOCK(sc);
 1795         callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
 1796             bridge_timer, sc);
 1797 
 1798         ifp->if_drv_flags |= IFF_DRV_RUNNING;
 1799         bstp_init(&sc->sc_stp);         /* Initialize Spanning Tree */
 1800 
 1801         BRIDGE_UNLOCK(sc);
 1802 }
 1803 
 1804 /*
 1805  * bridge_stop:
 1806  *
 1807  *      Stop the bridge interface.
 1808  */
 1809 static void
 1810 bridge_stop(struct ifnet *ifp, int disable)
 1811 {
 1812         struct bridge_softc *sc = ifp->if_softc;
 1813 
 1814         BRIDGE_LOCK_ASSERT(sc);
 1815 
 1816         if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
 1817                 return;
 1818 
 1819         callout_stop(&sc->sc_brcallout);
 1820         bstp_stop(&sc->sc_stp);
 1821 
 1822         bridge_rtflush(sc, IFBF_FLUSHDYN);
 1823 
 1824         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
 1825 }
 1826 
 1827 /*
 1828  * bridge_enqueue:
 1829  *
 1830  *      Enqueue a packet on a bridge member interface.
 1831  *
 1832  */
 1833 static int
 1834 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
 1835 {
 1836         int len, err = 0;
 1837         short mflags;
 1838         struct mbuf *m0;
 1839 
 1840         /* We may be sending a fragment so traverse the mbuf */
 1841         for (; m; m = m0) {
 1842                 m0 = m->m_nextpkt;
 1843                 m->m_nextpkt = NULL;
 1844                 len = m->m_pkthdr.len;
 1845                 mflags = m->m_flags;
 1846 
 1847                 /*
 1848                  * If underlying interface can not do VLAN tag insertion itself
 1849                  * then attach a packet tag that holds it.
 1850                  */
 1851                 if ((m->m_flags & M_VLANTAG) &&
 1852                     (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
 1853                         m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
 1854                         if (m == NULL) {
 1855                                 if_printf(dst_ifp,
 1856                                     "unable to prepend VLAN header\n");
 1857                                 dst_ifp->if_oerrors++;
 1858                                 continue;
 1859                         }
 1860                         m->m_flags &= ~M_VLANTAG;
 1861                 }
 1862 
 1863                 if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
 1864                         m_freem(m0);
 1865                         sc->sc_ifp->if_oerrors++;
 1866                         break;
 1867                 }
 1868 
 1869                 sc->sc_ifp->if_opackets++;
 1870                 sc->sc_ifp->if_obytes += len;
 1871                 if (mflags & M_MCAST)
 1872                         sc->sc_ifp->if_omcasts++;
 1873         }
 1874 
 1875         return (err);
 1876 }
 1877 
 1878 /*
 1879  * bridge_dummynet:
 1880  *
 1881  *      Receive a queued packet from dummynet and pass it on to the output
 1882  *      interface.
 1883  *
 1884  *      The mbuf has the Ethernet header already attached.
 1885  */
 1886 static void
 1887 bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
 1888 {
 1889         struct bridge_softc *sc;
 1890 
 1891         sc = ifp->if_bridge;
 1892 
 1893         /*
 1894          * The packet didnt originate from a member interface. This should only
 1895          * ever happen if a member interface is removed while packets are
 1896          * queued for it.
 1897          */
 1898         if (sc == NULL) {
 1899                 m_freem(m);
 1900                 return;
 1901         }
 1902 
 1903         if (PFIL_HOOKED(&V_inet_pfil_hook)
 1904 #ifdef INET6
 1905             || PFIL_HOOKED(&V_inet6_pfil_hook)
 1906 #endif
 1907             ) {
 1908                 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
 1909                         return;
 1910                 if (m == NULL)
 1911                         return;
 1912         }
 1913 
 1914         bridge_enqueue(sc, ifp, m);
 1915 }
 1916 
 1917 /*
 1918  * bridge_output:
 1919  *
 1920  *      Send output from a bridge member interface.  This
 1921  *      performs the bridging function for locally originated
 1922  *      packets.
 1923  *
 1924  *      The mbuf has the Ethernet header already attached.  We must
 1925  *      enqueue or free the mbuf before returning.
 1926  */
 1927 static int
 1928 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
 1929     struct rtentry *rt)
 1930 {
 1931         struct ether_header *eh;
 1932         struct ifnet *dst_if;
 1933         struct bridge_softc *sc;
 1934         uint16_t vlan;
 1935 
 1936         if (m->m_len < ETHER_HDR_LEN) {
 1937                 m = m_pullup(m, ETHER_HDR_LEN);
 1938                 if (m == NULL)
 1939                         return (0);
 1940         }
 1941 
 1942         eh = mtod(m, struct ether_header *);
 1943         sc = ifp->if_bridge;
 1944         vlan = VLANTAGOF(m);
 1945 
 1946         BRIDGE_LOCK(sc);
 1947 
 1948         /*
 1949          * If bridge is down, but the original output interface is up,
 1950          * go ahead and send out that interface.  Otherwise, the packet
 1951          * is dropped below.
 1952          */
 1953         if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
 1954                 dst_if = ifp;
 1955                 goto sendunicast;
 1956         }
 1957 
 1958         /*
 1959          * If the packet is a multicast, or we don't know a better way to
 1960          * get there, send to all interfaces.
 1961          */
 1962         if (ETHER_IS_MULTICAST(eh->ether_dhost))
 1963                 dst_if = NULL;
 1964         else
 1965                 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan);
 1966         if (dst_if == NULL) {
 1967                 struct bridge_iflist *bif;
 1968                 struct mbuf *mc;
 1969                 int error = 0, used = 0;
 1970 
 1971                 bridge_span(sc, m);
 1972 
 1973                 BRIDGE_LOCK2REF(sc, error);
 1974                 if (error) {
 1975                         m_freem(m);
 1976                         return (0);
 1977                 }
 1978 
 1979                 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 1980                         dst_if = bif->bif_ifp;
 1981 
 1982                         if (dst_if->if_type == IFT_GIF)
 1983                                 continue;
 1984                         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
 1985                                 continue;
 1986 
 1987                         /*
 1988                          * If this is not the original output interface,
 1989                          * and the interface is participating in spanning
 1990                          * tree, make sure the port is in a state that
 1991                          * allows forwarding.
 1992                          */
 1993                         if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) &&
 1994                             bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
 1995                                 continue;
 1996 
 1997                         if (LIST_NEXT(bif, bif_next) == NULL) {
 1998                                 used = 1;
 1999                                 mc = m;
 2000                         } else {
 2001                                 mc = m_copypacket(m, M_NOWAIT);
 2002                                 if (mc == NULL) {
 2003                                         sc->sc_ifp->if_oerrors++;
 2004                                         continue;
 2005                                 }
 2006                         }
 2007 
 2008                         bridge_enqueue(sc, dst_if, mc);
 2009                 }
 2010                 if (used == 0)
 2011                         m_freem(m);
 2012                 BRIDGE_UNREF(sc);
 2013                 return (0);
 2014         }
 2015 
 2016 sendunicast:
 2017         /*
 2018          * XXX Spanning tree consideration here?
 2019          */
 2020 
 2021         bridge_span(sc, m);
 2022         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
 2023                 m_freem(m);
 2024                 BRIDGE_UNLOCK(sc);
 2025                 return (0);
 2026         }
 2027 
 2028         BRIDGE_UNLOCK(sc);
 2029         bridge_enqueue(sc, dst_if, m);
 2030         return (0);
 2031 }
 2032 
 2033 /*
 2034  * bridge_transmit:
 2035  *
 2036  *      Do output on a bridge.
 2037  *
 2038  */
 2039 static int
 2040 bridge_transmit(struct ifnet *ifp, struct mbuf *m)
 2041 {
 2042         struct bridge_softc *sc;
 2043         struct ether_header *eh;
 2044         struct ifnet *dst_if;
 2045         int error = 0;
 2046 
 2047         sc = ifp->if_softc;
 2048 
 2049         ETHER_BPF_MTAP(ifp, m);
 2050 
 2051         eh = mtod(m, struct ether_header *);
 2052 
 2053         BRIDGE_LOCK(sc);
 2054         if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) &&
 2055             (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) {
 2056                 BRIDGE_UNLOCK(sc);
 2057                 error = bridge_enqueue(sc, dst_if, m);
 2058         } else
 2059                 bridge_broadcast(sc, ifp, m, 0);
 2060 
 2061         return (error);
 2062 }
 2063 
 2064 /*
 2065  * The ifp->if_qflush entry point for if_bridge(4) is no-op.
 2066  */
 2067 static void
 2068 bridge_qflush(struct ifnet *ifp __unused)
 2069 {
 2070 }
 2071 
 2072 /*
 2073  * bridge_forward:
 2074  *
 2075  *      The forwarding function of the bridge.
 2076  *
 2077  *      NOTE: Releases the lock on return.
 2078  */
 2079 static void
 2080 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
 2081     struct mbuf *m)
 2082 {
 2083         struct bridge_iflist *dbif;
 2084         struct ifnet *src_if, *dst_if, *ifp;
 2085         struct ether_header *eh;
 2086         uint16_t vlan;
 2087         uint8_t *dst;
 2088         int error;
 2089 
 2090         src_if = m->m_pkthdr.rcvif;
 2091         ifp = sc->sc_ifp;
 2092 
 2093         ifp->if_ipackets++;
 2094         ifp->if_ibytes += m->m_pkthdr.len;
 2095         vlan = VLANTAGOF(m);
 2096 
 2097         if ((sbif->bif_flags & IFBIF_STP) &&
 2098             sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
 2099                 goto drop;
 2100 
 2101         eh = mtod(m, struct ether_header *);
 2102         dst = eh->ether_dhost;
 2103 
 2104         /* If the interface is learning, record the address. */
 2105         if (sbif->bif_flags & IFBIF_LEARNING) {
 2106                 error = bridge_rtupdate(sc, eh->ether_shost, vlan,
 2107                     sbif, 0, IFBAF_DYNAMIC);
 2108                 /*
 2109                  * If the interface has addresses limits then deny any source
 2110                  * that is not in the cache.
 2111                  */
 2112                 if (error && sbif->bif_addrmax)
 2113                         goto drop;
 2114         }
 2115 
 2116         if ((sbif->bif_flags & IFBIF_STP) != 0 &&
 2117             sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
 2118                 goto drop;
 2119 
 2120         /*
 2121          * At this point, the port either doesn't participate
 2122          * in spanning tree or it is in the forwarding state.
 2123          */
 2124 
 2125         /*
 2126          * If the packet is unicast, destined for someone on
 2127          * "this" side of the bridge, drop it.
 2128          */
 2129         if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
 2130                 dst_if = bridge_rtlookup(sc, dst, vlan);
 2131                 if (src_if == dst_if)
 2132                         goto drop;
 2133         } else {
 2134                 /*
 2135                  * Check if its a reserved multicast address, any address
 2136                  * listed in 802.1D section 7.12.6 may not be forwarded by the
 2137                  * bridge.
 2138                  * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
 2139                  */
 2140                 if (dst[0] == 0x01 && dst[1] == 0x80 &&
 2141                     dst[2] == 0xc2 && dst[3] == 0x00 &&
 2142                     dst[4] == 0x00 && dst[5] <= 0x0f)
 2143                         goto drop;
 2144 
 2145                 /* ...forward it to all interfaces. */
 2146                 ifp->if_imcasts++;
 2147                 dst_if = NULL;
 2148         }
 2149 
 2150         /*
 2151          * If we have a destination interface which is a member of our bridge,
 2152          * OR this is a unicast packet, push it through the bpf(4) machinery.
 2153          * For broadcast or multicast packets, don't bother because it will
 2154          * be reinjected into ether_input. We do this before we pass the packets
 2155          * through the pfil(9) framework, as it is possible that pfil(9) will
 2156          * drop the packet, or possibly modify it, making it difficult to debug
 2157          * firewall issues on the bridge.
 2158          */
 2159         if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
 2160                 ETHER_BPF_MTAP(ifp, m);
 2161 
 2162         /* run the packet filter */
 2163         if (PFIL_HOOKED(&V_inet_pfil_hook)
 2164 #ifdef INET6
 2165             || PFIL_HOOKED(&V_inet6_pfil_hook)
 2166 #endif
 2167             ) {
 2168                 BRIDGE_UNLOCK(sc);
 2169                 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
 2170                         return;
 2171                 if (m == NULL)
 2172                         return;
 2173                 BRIDGE_LOCK(sc);
 2174         }
 2175 
 2176         if (dst_if == NULL) {
 2177                 bridge_broadcast(sc, src_if, m, 1);
 2178                 return;
 2179         }
 2180 
 2181         /*
 2182          * At this point, we're dealing with a unicast frame
 2183          * going to a different interface.
 2184          */
 2185         if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
 2186                 goto drop;
 2187 
 2188         dbif = bridge_lookup_member_if(sc, dst_if);
 2189         if (dbif == NULL)
 2190                 /* Not a member of the bridge (anymore?) */
 2191                 goto drop;
 2192 
 2193         /* Private segments can not talk to each other */
 2194         if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
 2195                 goto drop;
 2196 
 2197         if ((dbif->bif_flags & IFBIF_STP) &&
 2198             dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
 2199                 goto drop;
 2200 
 2201         BRIDGE_UNLOCK(sc);
 2202 
 2203         if (PFIL_HOOKED(&V_inet_pfil_hook)
 2204 #ifdef INET6
 2205             || PFIL_HOOKED(&V_inet6_pfil_hook)
 2206 #endif
 2207             ) {
 2208                 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
 2209                         return;
 2210                 if (m == NULL)
 2211                         return;
 2212         }
 2213 
 2214         bridge_enqueue(sc, dst_if, m);
 2215         return;
 2216 
 2217 drop:
 2218         BRIDGE_UNLOCK(sc);
 2219         m_freem(m);
 2220 }
 2221 
 2222 /*
 2223  * bridge_input:
 2224  *
 2225  *      Receive input from a member interface.  Queue the packet for
 2226  *      bridging if it is not for us.
 2227  */
 2228 static struct mbuf *
 2229 bridge_input(struct ifnet *ifp, struct mbuf *m)
 2230 {
 2231         struct bridge_softc *sc = ifp->if_bridge;
 2232         struct bridge_iflist *bif, *bif2;
 2233         struct ifnet *bifp;
 2234         struct ether_header *eh;
 2235         struct mbuf *mc, *mc2;
 2236         uint16_t vlan;
 2237         int error;
 2238 
 2239         if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
 2240                 return (m);
 2241 
 2242         bifp = sc->sc_ifp;
 2243         vlan = VLANTAGOF(m);
 2244 
 2245         /*
 2246          * Implement support for bridge monitoring. If this flag has been
 2247          * set on this interface, discard the packet once we push it through
 2248          * the bpf(4) machinery, but before we do, increment the byte and
 2249          * packet counters associated with this interface.
 2250          */
 2251         if ((bifp->if_flags & IFF_MONITOR) != 0) {
 2252                 m->m_pkthdr.rcvif  = bifp;
 2253                 ETHER_BPF_MTAP(bifp, m);
 2254                 bifp->if_ipackets++;
 2255                 bifp->if_ibytes += m->m_pkthdr.len;
 2256                 m_freem(m);
 2257                 return (NULL);
 2258         }
 2259         BRIDGE_LOCK(sc);
 2260         bif = bridge_lookup_member_if(sc, ifp);
 2261         if (bif == NULL) {
 2262                 BRIDGE_UNLOCK(sc);
 2263                 return (m);
 2264         }
 2265 
 2266         eh = mtod(m, struct ether_header *);
 2267 
 2268         bridge_span(sc, m);
 2269 
 2270         if (m->m_flags & (M_BCAST|M_MCAST)) {
 2271                 /* Tap off 802.1D packets; they do not get forwarded. */
 2272                 if (memcmp(eh->ether_dhost, bstp_etheraddr,
 2273                     ETHER_ADDR_LEN) == 0) {
 2274                         bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
 2275                         BRIDGE_UNLOCK(sc);
 2276                         return (NULL);
 2277                 }
 2278 
 2279                 if ((bif->bif_flags & IFBIF_STP) &&
 2280                     bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
 2281                         BRIDGE_UNLOCK(sc);
 2282                         return (m);
 2283                 }
 2284 
 2285                 /*
 2286                  * Make a deep copy of the packet and enqueue the copy
 2287                  * for bridge processing; return the original packet for
 2288                  * local processing.
 2289                  */
 2290                 mc = m_dup(m, M_NOWAIT);
 2291                 if (mc == NULL) {
 2292                         BRIDGE_UNLOCK(sc);
 2293                         return (m);
 2294                 }
 2295 
 2296                 /* Perform the bridge forwarding function with the copy. */
 2297                 bridge_forward(sc, bif, mc);
 2298 
 2299                 /*
 2300                  * Reinject the mbuf as arriving on the bridge so we have a
 2301                  * chance at claiming multicast packets. We can not loop back
 2302                  * here from ether_input as a bridge is never a member of a
 2303                  * bridge.
 2304                  */
 2305                 KASSERT(bifp->if_bridge == NULL,
 2306                     ("loop created in bridge_input"));
 2307                 mc2 = m_dup(m, M_NOWAIT);
 2308                 if (mc2 != NULL) {
 2309                         /* Keep the layer3 header aligned */
 2310                         int i = min(mc2->m_pkthdr.len, max_protohdr);
 2311                         mc2 = m_copyup(mc2, i, ETHER_ALIGN);
 2312                 }
 2313                 if (mc2 != NULL) {
 2314                         mc2->m_pkthdr.rcvif = bifp;
 2315                         (*bifp->if_input)(bifp, mc2);
 2316                 }
 2317 
 2318                 /* Return the original packet for local processing. */
 2319                 return (m);
 2320         }
 2321 
 2322         if ((bif->bif_flags & IFBIF_STP) &&
 2323             bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
 2324                 BRIDGE_UNLOCK(sc);
 2325                 return (m);
 2326         }
 2327 
 2328 #if (defined(INET) || defined(INET6))
 2329 #   define OR_CARP_CHECK_WE_ARE_DST(iface) \
 2330         || ((iface)->if_carp \
 2331             && (*carp_forus_p)((iface), eh->ether_dhost))
 2332 #   define OR_CARP_CHECK_WE_ARE_SRC(iface) \
 2333         || ((iface)->if_carp \
 2334             && (*carp_forus_p)((iface), eh->ether_shost))
 2335 #else
 2336 #   define OR_CARP_CHECK_WE_ARE_DST(iface)
 2337 #   define OR_CARP_CHECK_WE_ARE_SRC(iface)
 2338 #endif
 2339 
 2340 #ifdef INET6
 2341 #   define OR_PFIL_HOOKED_INET6 \
 2342         || PFIL_HOOKED(&V_inet6_pfil_hook)
 2343 #else
 2344 #   define OR_PFIL_HOOKED_INET6
 2345 #endif
 2346 
 2347 #define GRAB_OUR_PACKETS(iface) \
 2348         if ((iface)->if_type == IFT_GIF) \
 2349                 continue; \
 2350         /* It is destined for us. */ \
 2351         if (memcmp(IF_LLADDR((iface)), eh->ether_dhost,  ETHER_ADDR_LEN) == 0 \
 2352             OR_CARP_CHECK_WE_ARE_DST((iface))                           \
 2353             ) {                                                         \
 2354                 if ((iface)->if_type == IFT_BRIDGE) {                   \
 2355                         ETHER_BPF_MTAP(iface, m);                       \
 2356                         iface->if_ipackets++;                           \
 2357                         iface->if_ibytes += m->m_pkthdr.len;            \
 2358                         /* Filter on the physical interface. */         \
 2359                         if (pfil_local_phys &&                          \
 2360                             (PFIL_HOOKED(&V_inet_pfil_hook)             \
 2361                              OR_PFIL_HOOKED_INET6)) {                   \
 2362                                 if (bridge_pfil(&m, NULL, ifp,          \
 2363                                     PFIL_IN) != 0 || m == NULL) {       \
 2364                                         BRIDGE_UNLOCK(sc);              \
 2365                                         return (NULL);                  \
 2366                                 }                                       \
 2367                                 eh = mtod(m, struct ether_header *);    \
 2368                         }                                               \
 2369                 }                                                       \
 2370                 if (bif->bif_flags & IFBIF_LEARNING) {                  \
 2371                         error = bridge_rtupdate(sc, eh->ether_shost,    \
 2372                             vlan, bif, 0, IFBAF_DYNAMIC);               \
 2373                         if (error && bif->bif_addrmax) {                \
 2374                                 BRIDGE_UNLOCK(sc);                      \
 2375                                 m_freem(m);                             \
 2376                                 return (NULL);                          \
 2377                         }                                               \
 2378                 }                                                       \
 2379                 m->m_pkthdr.rcvif = iface;                              \
 2380                 BRIDGE_UNLOCK(sc);                                      \
 2381                 return (m);                                             \
 2382         }                                                               \
 2383                                                                         \
 2384         /* We just received a packet that we sent out. */               \
 2385         if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
 2386             OR_CARP_CHECK_WE_ARE_SRC((iface))                   \
 2387             ) {                                                         \
 2388                 BRIDGE_UNLOCK(sc);                                      \
 2389                 m_freem(m);                                             \
 2390                 return (NULL);                                          \
 2391         }
 2392 
 2393         /*
 2394          * Unicast.  Make sure it's not for the bridge.
 2395          */
 2396         do { GRAB_OUR_PACKETS(bifp) } while (0);
 2397 
 2398         /*
 2399          * Give a chance for ifp at first priority. This will help when the
 2400          * packet comes through the interface like VLAN's with the same MACs
 2401          * on several interfaces from the same bridge. This also will save
 2402          * some CPU cycles in case the destination interface and the input
 2403          * interface (eq ifp) are the same.
 2404          */
 2405         do { GRAB_OUR_PACKETS(ifp) } while (0);
 2406 
 2407         /* Now check the all bridge members. */
 2408         LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
 2409                 GRAB_OUR_PACKETS(bif2->bif_ifp)
 2410         }
 2411 
 2412 #undef OR_CARP_CHECK_WE_ARE_DST
 2413 #undef OR_CARP_CHECK_WE_ARE_SRC
 2414 #undef OR_PFIL_HOOKED_INET6
 2415 #undef GRAB_OUR_PACKETS
 2416 
 2417         /* Perform the bridge forwarding function. */
 2418         bridge_forward(sc, bif, m);
 2419 
 2420         return (NULL);
 2421 }
 2422 
 2423 /*
 2424  * bridge_broadcast:
 2425  *
 2426  *      Send a frame to all interfaces that are members of
 2427  *      the bridge, except for the one on which the packet
 2428  *      arrived.
 2429  *
 2430  *      NOTE: Releases the lock on return.
 2431  */
 2432 static void
 2433 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
 2434     struct mbuf *m, int runfilt)
 2435 {
 2436         struct bridge_iflist *dbif, *sbif;
 2437         struct mbuf *mc;
 2438         struct ifnet *dst_if;
 2439         int error = 0, used = 0, i;
 2440 
 2441         sbif = bridge_lookup_member_if(sc, src_if);
 2442 
 2443         BRIDGE_LOCK2REF(sc, error);
 2444         if (error) {
 2445                 m_freem(m);
 2446                 return;
 2447         }
 2448 
 2449         /* Filter on the bridge interface before broadcasting */
 2450         if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
 2451 #ifdef INET6
 2452             || PFIL_HOOKED(&V_inet6_pfil_hook)
 2453 #endif
 2454             )) {
 2455                 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
 2456                         goto out;
 2457                 if (m == NULL)
 2458                         goto out;
 2459         }
 2460 
 2461         LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
 2462                 dst_if = dbif->bif_ifp;
 2463                 if (dst_if == src_if)
 2464                         continue;
 2465 
 2466                 /* Private segments can not talk to each other */
 2467                 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
 2468                         continue;
 2469 
 2470                 if ((dbif->bif_flags & IFBIF_STP) &&
 2471                     dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
 2472                         continue;
 2473 
 2474                 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 &&
 2475                     (m->m_flags & (M_BCAST|M_MCAST)) == 0)
 2476                         continue;
 2477 
 2478                 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
 2479                         continue;
 2480 
 2481                 if (LIST_NEXT(dbif, bif_next) == NULL) {
 2482                         mc = m;
 2483                         used = 1;
 2484                 } else {
 2485                         mc = m_dup(m, M_NOWAIT);
 2486                         if (mc == NULL) {
 2487                                 sc->sc_ifp->if_oerrors++;
 2488                                 continue;
 2489                         }
 2490                 }
 2491 
 2492                 /*
 2493                  * Filter on the output interface. Pass a NULL bridge interface
 2494                  * pointer so we do not redundantly filter on the bridge for
 2495                  * each interface we broadcast on.
 2496                  */
 2497                 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook)
 2498 #ifdef INET6
 2499                     || PFIL_HOOKED(&V_inet6_pfil_hook)
 2500 #endif
 2501                     )) {
 2502                         if (used == 0) {
 2503                                 /* Keep the layer3 header aligned */
 2504                                 i = min(mc->m_pkthdr.len, max_protohdr);
 2505                                 mc = m_copyup(mc, i, ETHER_ALIGN);
 2506                                 if (mc == NULL) {
 2507                                         sc->sc_ifp->if_oerrors++;
 2508                                         continue;
 2509                                 }
 2510                         }
 2511                         if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
 2512                                 continue;
 2513                         if (mc == NULL)
 2514                                 continue;
 2515                 }
 2516 
 2517                 bridge_enqueue(sc, dst_if, mc);
 2518         }
 2519         if (used == 0)
 2520                 m_freem(m);
 2521 
 2522 out:
 2523         BRIDGE_UNREF(sc);
 2524 }
 2525 
 2526 /*
 2527  * bridge_span:
 2528  *
 2529  *      Duplicate a packet out one or more interfaces that are in span mode,
 2530  *      the original mbuf is unmodified.
 2531  */
 2532 static void
 2533 bridge_span(struct bridge_softc *sc, struct mbuf *m)
 2534 {
 2535         struct bridge_iflist *bif;
 2536         struct ifnet *dst_if;
 2537         struct mbuf *mc;
 2538 
 2539         if (LIST_EMPTY(&sc->sc_spanlist))
 2540                 return;
 2541 
 2542         LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
 2543                 dst_if = bif->bif_ifp;
 2544 
 2545                 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
 2546                         continue;
 2547 
 2548                 mc = m_copypacket(m, M_NOWAIT);
 2549                 if (mc == NULL) {
 2550                         sc->sc_ifp->if_oerrors++;
 2551                         continue;
 2552                 }
 2553 
 2554                 bridge_enqueue(sc, dst_if, mc);
 2555         }
 2556 }
 2557 
 2558 /*
 2559  * bridge_rtupdate:
 2560  *
 2561  *      Add a bridge routing entry.
 2562  */
 2563 static int
 2564 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan,
 2565     struct bridge_iflist *bif, int setflags, uint8_t flags)
 2566 {
 2567         struct bridge_rtnode *brt;
 2568         int error;
 2569 
 2570         BRIDGE_LOCK_ASSERT(sc);
 2571 
 2572         /* Check the source address is valid and not multicast. */
 2573         if (ETHER_IS_MULTICAST(dst) ||
 2574             (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
 2575              dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
 2576                 return (EINVAL);
 2577 
 2578         /* 802.1p frames map to vlan 1 */
 2579         if (vlan == 0)
 2580                 vlan = 1;
 2581 
 2582         /*
 2583          * A route for this destination might already exist.  If so,
 2584          * update it, otherwise create a new one.
 2585          */
 2586         if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
 2587                 if (sc->sc_brtcnt >= sc->sc_brtmax) {
 2588                         sc->sc_brtexceeded++;
 2589                         return (ENOSPC);
 2590                 }
 2591                 /* Check per interface address limits (if enabled) */
 2592                 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
 2593                         bif->bif_addrexceeded++;
 2594                         return (ENOSPC);
 2595                 }
 2596 
 2597                 /*
 2598                  * Allocate a new bridge forwarding node, and
 2599                  * initialize the expiration time and Ethernet
 2600                  * address.
 2601                  */
 2602                 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO);
 2603                 if (brt == NULL)
 2604                         return (ENOMEM);
 2605 
 2606                 if (bif->bif_flags & IFBIF_STICKY)
 2607                         brt->brt_flags = IFBAF_STICKY;
 2608                 else
 2609                         brt->brt_flags = IFBAF_DYNAMIC;
 2610 
 2611                 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
 2612                 brt->brt_vlan = vlan;
 2613 
 2614                 if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
 2615                         uma_zfree(bridge_rtnode_zone, brt);
 2616                         return (error);
 2617                 }
 2618                 brt->brt_dst = bif;
 2619                 bif->bif_addrcnt++;
 2620         }
 2621 
 2622         if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
 2623             brt->brt_dst != bif) {
 2624                 brt->brt_dst->bif_addrcnt--;
 2625                 brt->brt_dst = bif;
 2626                 brt->brt_dst->bif_addrcnt++;
 2627         }
 2628 
 2629         if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
 2630                 brt->brt_expire = time_uptime + sc->sc_brttimeout;
 2631         if (setflags)
 2632                 brt->brt_flags = flags;
 2633 
 2634         return (0);
 2635 }
 2636 
 2637 /*
 2638  * bridge_rtlookup:
 2639  *
 2640  *      Lookup the destination interface for an address.
 2641  */
 2642 static struct ifnet *
 2643 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
 2644 {
 2645         struct bridge_rtnode *brt;
 2646 
 2647         BRIDGE_LOCK_ASSERT(sc);
 2648 
 2649         if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL)
 2650                 return (NULL);
 2651 
 2652         return (brt->brt_ifp);
 2653 }
 2654 
 2655 /*
 2656  * bridge_rttrim:
 2657  *
 2658  *      Trim the routine table so that we have a number
 2659  *      of routing entries less than or equal to the
 2660  *      maximum number.
 2661  */
 2662 static void
 2663 bridge_rttrim(struct bridge_softc *sc)
 2664 {
 2665         struct bridge_rtnode *brt, *nbrt;
 2666 
 2667         BRIDGE_LOCK_ASSERT(sc);
 2668 
 2669         /* Make sure we actually need to do this. */
 2670         if (sc->sc_brtcnt <= sc->sc_brtmax)
 2671                 return;
 2672 
 2673         /* Force an aging cycle; this might trim enough addresses. */
 2674         bridge_rtage(sc);
 2675         if (sc->sc_brtcnt <= sc->sc_brtmax)
 2676                 return;
 2677 
 2678         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
 2679                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
 2680                         bridge_rtnode_destroy(sc, brt);
 2681                         if (sc->sc_brtcnt <= sc->sc_brtmax)
 2682                                 return;
 2683                 }
 2684         }
 2685 }
 2686 
 2687 /*
 2688  * bridge_timer:
 2689  *
 2690  *      Aging timer for the bridge.
 2691  */
 2692 static void
 2693 bridge_timer(void *arg)
 2694 {
 2695         struct bridge_softc *sc = arg;
 2696 
 2697         BRIDGE_LOCK_ASSERT(sc);
 2698 
 2699         bridge_rtage(sc);
 2700 
 2701         if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
 2702                 callout_reset(&sc->sc_brcallout,
 2703                     bridge_rtable_prune_period * hz, bridge_timer, sc);
 2704 }
 2705 
 2706 /*
 2707  * bridge_rtage:
 2708  *
 2709  *      Perform an aging cycle.
 2710  */
 2711 static void
 2712 bridge_rtage(struct bridge_softc *sc)
 2713 {
 2714         struct bridge_rtnode *brt, *nbrt;
 2715 
 2716         BRIDGE_LOCK_ASSERT(sc);
 2717 
 2718         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
 2719                 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
 2720                         if (time_uptime >= brt->brt_expire)
 2721                                 bridge_rtnode_destroy(sc, brt);
 2722                 }
 2723         }
 2724 }
 2725 
 2726 /*
 2727  * bridge_rtflush:
 2728  *
 2729  *      Remove all dynamic addresses from the bridge.
 2730  */
 2731 static void
 2732 bridge_rtflush(struct bridge_softc *sc, int full)
 2733 {
 2734         struct bridge_rtnode *brt, *nbrt;
 2735 
 2736         BRIDGE_LOCK_ASSERT(sc);
 2737 
 2738         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
 2739                 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
 2740                         bridge_rtnode_destroy(sc, brt);
 2741         }
 2742 }
 2743 
 2744 /*
 2745  * bridge_rtdaddr:
 2746  *
 2747  *      Remove an address from the table.
 2748  */
 2749 static int
 2750 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
 2751 {
 2752         struct bridge_rtnode *brt;
 2753         int found = 0;
 2754 
 2755         BRIDGE_LOCK_ASSERT(sc);
 2756 
 2757         /*
 2758          * If vlan is zero then we want to delete for all vlans so the lookup
 2759          * may return more than one.
 2760          */
 2761         while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
 2762                 bridge_rtnode_destroy(sc, brt);
 2763                 found = 1;
 2764         }
 2765 
 2766         return (found ? 0 : ENOENT);
 2767 }
 2768 
 2769 /*
 2770  * bridge_rtdelete:
 2771  *
 2772  *      Delete routes to a speicifc member interface.
 2773  */
 2774 static void
 2775 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
 2776 {
 2777         struct bridge_rtnode *brt, *nbrt;
 2778 
 2779         BRIDGE_LOCK_ASSERT(sc);
 2780 
 2781         LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
 2782                 if (brt->brt_ifp == ifp && (full ||
 2783                             (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
 2784                         bridge_rtnode_destroy(sc, brt);
 2785         }
 2786 }
 2787 
 2788 /*
 2789  * bridge_rtable_init:
 2790  *
 2791  *      Initialize the route table for this bridge.
 2792  */
 2793 static void
 2794 bridge_rtable_init(struct bridge_softc *sc)
 2795 {
 2796         int i;
 2797 
 2798         sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
 2799             M_DEVBUF, M_WAITOK);
 2800 
 2801         for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
 2802                 LIST_INIT(&sc->sc_rthash[i]);
 2803 
 2804         sc->sc_rthash_key = arc4random();
 2805         LIST_INIT(&sc->sc_rtlist);
 2806 }
 2807 
 2808 /*
 2809  * bridge_rtable_fini:
 2810  *
 2811  *      Deconstruct the route table for this bridge.
 2812  */
 2813 static void
 2814 bridge_rtable_fini(struct bridge_softc *sc)
 2815 {
 2816 
 2817         KASSERT(sc->sc_brtcnt == 0,
 2818             ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
 2819         free(sc->sc_rthash, M_DEVBUF);
 2820 }
 2821 
 2822 /*
 2823  * The following hash function is adapted from "Hash Functions" by Bob Jenkins
 2824  * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
 2825  */
 2826 #define mix(a, b, c)                                                    \
 2827 do {                                                                    \
 2828         a -= b; a -= c; a ^= (c >> 13);                                 \
 2829         b -= c; b -= a; b ^= (a << 8);                                  \
 2830         c -= a; c -= b; c ^= (b >> 13);                                 \
 2831         a -= b; a -= c; a ^= (c >> 12);                                 \
 2832         b -= c; b -= a; b ^= (a << 16);                                 \
 2833         c -= a; c -= b; c ^= (b >> 5);                                  \
 2834         a -= b; a -= c; a ^= (c >> 3);                                  \
 2835         b -= c; b -= a; b ^= (a << 10);                                 \
 2836         c -= a; c -= b; c ^= (b >> 15);                                 \
 2837 } while (/*CONSTCOND*/0)
 2838 
 2839 static __inline uint32_t
 2840 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
 2841 {
 2842         uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
 2843 
 2844         b += addr[5] << 8;
 2845         b += addr[4];
 2846         a += addr[3] << 24;
 2847         a += addr[2] << 16;
 2848         a += addr[1] << 8;
 2849         a += addr[0];
 2850 
 2851         mix(a, b, c);
 2852 
 2853         return (c & BRIDGE_RTHASH_MASK);
 2854 }
 2855 
 2856 #undef mix
 2857 
 2858 static int
 2859 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
 2860 {
 2861         int i, d;
 2862 
 2863         for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
 2864                 d = ((int)a[i]) - ((int)b[i]);
 2865         }
 2866 
 2867         return (d);
 2868 }
 2869 
 2870 /*
 2871  * bridge_rtnode_lookup:
 2872  *
 2873  *      Look up a bridge route node for the specified destination. Compare the
 2874  *      vlan id or if zero then just return the first match.
 2875  */
 2876 static struct bridge_rtnode *
 2877 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
 2878 {
 2879         struct bridge_rtnode *brt;
 2880         uint32_t hash;
 2881         int dir;
 2882 
 2883         BRIDGE_LOCK_ASSERT(sc);
 2884 
 2885         hash = bridge_rthash(sc, addr);
 2886         LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
 2887                 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
 2888                 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0))
 2889                         return (brt);
 2890                 if (dir > 0)
 2891                         return (NULL);
 2892         }
 2893 
 2894         return (NULL);
 2895 }
 2896 
 2897 /*
 2898  * bridge_rtnode_insert:
 2899  *
 2900  *      Insert the specified bridge node into the route table.  We
 2901  *      assume the entry is not already in the table.
 2902  */
 2903 static int
 2904 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
 2905 {
 2906         struct bridge_rtnode *lbrt;
 2907         uint32_t hash;
 2908         int dir;
 2909 
 2910         BRIDGE_LOCK_ASSERT(sc);
 2911 
 2912         hash = bridge_rthash(sc, brt->brt_addr);
 2913 
 2914         lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
 2915         if (lbrt == NULL) {
 2916                 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
 2917                 goto out;
 2918         }
 2919 
 2920         do {
 2921                 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
 2922                 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan)
 2923                         return (EEXIST);
 2924                 if (dir > 0) {
 2925                         LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
 2926                         goto out;
 2927                 }
 2928                 if (LIST_NEXT(lbrt, brt_hash) == NULL) {
 2929                         LIST_INSERT_AFTER(lbrt, brt, brt_hash);
 2930                         goto out;
 2931                 }
 2932                 lbrt = LIST_NEXT(lbrt, brt_hash);
 2933         } while (lbrt != NULL);
 2934 
 2935 #ifdef DIAGNOSTIC
 2936         panic("bridge_rtnode_insert: impossible");
 2937 #endif
 2938 
 2939 out:
 2940         LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
 2941         sc->sc_brtcnt++;
 2942 
 2943         return (0);
 2944 }
 2945 
 2946 /*
 2947  * bridge_rtnode_destroy:
 2948  *
 2949  *      Destroy a bridge rtnode.
 2950  */
 2951 static void
 2952 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
 2953 {
 2954         BRIDGE_LOCK_ASSERT(sc);
 2955 
 2956         LIST_REMOVE(brt, brt_hash);
 2957 
 2958         LIST_REMOVE(brt, brt_list);
 2959         sc->sc_brtcnt--;
 2960         brt->brt_dst->bif_addrcnt--;
 2961         uma_zfree(bridge_rtnode_zone, brt);
 2962 }
 2963 
 2964 /*
 2965  * bridge_rtable_expire:
 2966  *
 2967  *      Set the expiry time for all routes on an interface.
 2968  */
 2969 static void
 2970 bridge_rtable_expire(struct ifnet *ifp, int age)
 2971 {
 2972         struct bridge_softc *sc = ifp->if_bridge;
 2973         struct bridge_rtnode *brt;
 2974 
 2975         BRIDGE_LOCK(sc);
 2976 
 2977         /*
 2978          * If the age is zero then flush, otherwise set all the expiry times to
 2979          * age for the interface
 2980          */
 2981         if (age == 0)
 2982                 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
 2983         else {
 2984                 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
 2985                         /* Cap the expiry time to 'age' */
 2986                         if (brt->brt_ifp == ifp &&
 2987                             brt->brt_expire > time_uptime + age &&
 2988                             (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
 2989                                 brt->brt_expire = time_uptime + age;
 2990                 }
 2991         }
 2992         BRIDGE_UNLOCK(sc);
 2993 }
 2994 
 2995 /*
 2996  * bridge_state_change:
 2997  *
 2998  *      Callback from the bridgestp code when a port changes states.
 2999  */
 3000 static void
 3001 bridge_state_change(struct ifnet *ifp, int state)
 3002 {
 3003         struct bridge_softc *sc = ifp->if_bridge;
 3004         static const char *stpstates[] = {
 3005                 "disabled",
 3006                 "listening",
 3007                 "learning",
 3008                 "forwarding",
 3009                 "blocking",
 3010                 "discarding"
 3011         };
 3012 
 3013         if (log_stp)
 3014                 log(LOG_NOTICE, "%s: state changed to %s on %s\n",
 3015                     sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
 3016 }
 3017 
 3018 /*
 3019  * Send bridge packets through pfil if they are one of the types pfil can deal
 3020  * with, or if they are ARP or REVARP.  (pfil will pass ARP and REVARP without
 3021  * question.) If *bifp or *ifp are NULL then packet filtering is skipped for
 3022  * that interface.
 3023  */
 3024 static int
 3025 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
 3026 {
 3027         int snap, error, i, hlen;
 3028         struct ether_header *eh1, eh2;
 3029         struct ip *ip;
 3030         struct llc llc1;
 3031         u_int16_t ether_type;
 3032 
 3033         snap = 0;
 3034         error = -1;     /* Default error if not error == 0 */
 3035 
 3036 #if 0
 3037         /* we may return with the IP fields swapped, ensure its not shared */
 3038         KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
 3039 #endif
 3040 
 3041         if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0)
 3042                 return (0); /* filtering is disabled */
 3043 
 3044         i = min((*mp)->m_pkthdr.len, max_protohdr);
 3045         if ((*mp)->m_len < i) {
 3046             *mp = m_pullup(*mp, i);
 3047             if (*mp == NULL) {
 3048                 printf("%s: m_pullup failed\n", __func__);
 3049                 return (-1);
 3050             }
 3051         }
 3052 
 3053         eh1 = mtod(*mp, struct ether_header *);
 3054         ether_type = ntohs(eh1->ether_type);
 3055 
 3056         /*
 3057          * Check for SNAP/LLC.
 3058          */
 3059         if (ether_type < ETHERMTU) {
 3060                 struct llc *llc2 = (struct llc *)(eh1 + 1);
 3061 
 3062                 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
 3063                     llc2->llc_dsap == LLC_SNAP_LSAP &&
 3064                     llc2->llc_ssap == LLC_SNAP_LSAP &&
 3065                     llc2->llc_control == LLC_UI) {
 3066                         ether_type = htons(llc2->llc_un.type_snap.ether_type);
 3067                         snap = 1;
 3068                 }
 3069         }
 3070 
 3071         /*
 3072          * If we're trying to filter bridge traffic, don't look at anything
 3073          * other than IP and ARP traffic.  If the filter doesn't understand
 3074          * IPv6, don't allow IPv6 through the bridge either.  This is lame
 3075          * since if we really wanted, say, an AppleTalk filter, we are hosed,
 3076          * but of course we don't have an AppleTalk filter to begin with.
 3077          * (Note that since pfil doesn't understand ARP it will pass *ALL*
 3078          * ARP traffic.)
 3079          */
 3080         switch (ether_type) {
 3081                 case ETHERTYPE_ARP:
 3082                 case ETHERTYPE_REVARP:
 3083                         if (pfil_ipfw_arp == 0)
 3084                                 return (0); /* Automatically pass */
 3085                         break;
 3086 
 3087                 case ETHERTYPE_IP:
 3088 #ifdef INET6
 3089                 case ETHERTYPE_IPV6:
 3090 #endif /* INET6 */
 3091                         break;
 3092                 default:
 3093                         /*
 3094                          * Check to see if the user wants to pass non-ip
 3095                          * packets, these will not be checked by pfil(9) and
 3096                          * passed unconditionally so the default is to drop.
 3097                          */
 3098                         if (pfil_onlyip)
 3099                                 goto bad;
 3100         }
 3101 
 3102         /* Run the packet through pfil before stripping link headers */
 3103         if (PFIL_HOOKED(&V_link_pfil_hook) && pfil_ipfw != 0 &&
 3104                         dir == PFIL_OUT && ifp != NULL) {
 3105 
 3106                 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL);
 3107 
 3108                 if (*mp == NULL || error != 0) /* packet consumed by filter */
 3109                         return (error);
 3110         }
 3111 
 3112         /* Strip off the Ethernet header and keep a copy. */
 3113         m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
 3114         m_adj(*mp, ETHER_HDR_LEN);
 3115 
 3116         /* Strip off snap header, if present */
 3117         if (snap) {
 3118                 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
 3119                 m_adj(*mp, sizeof(struct llc));
 3120         }
 3121 
 3122         /*
 3123          * Check the IP header for alignment and errors
 3124          */
 3125         if (dir == PFIL_IN) {
 3126                 switch (ether_type) {
 3127                         case ETHERTYPE_IP:
 3128                                 error = bridge_ip_checkbasic(mp);
 3129                                 break;
 3130 #ifdef INET6
 3131                         case ETHERTYPE_IPV6:
 3132                                 error = bridge_ip6_checkbasic(mp);
 3133                                 break;
 3134 #endif /* INET6 */
 3135                         default:
 3136                                 error = 0;
 3137                 }
 3138                 if (error)
 3139                         goto bad;
 3140         }
 3141 
 3142         error = 0;
 3143 
 3144         /*
 3145          * Run the packet through pfil
 3146          */
 3147         switch (ether_type) {
 3148         case ETHERTYPE_IP:
 3149                 /*
 3150                  * Run pfil on the member interface and the bridge, both can
 3151                  * be skipped by clearing pfil_member or pfil_bridge.
 3152                  *
 3153                  * Keep the order:
 3154                  *   in_if -> bridge_if -> out_if
 3155                  */
 3156                 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
 3157                         error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
 3158                                         dir, NULL);
 3159 
 3160                 if (*mp == NULL || error != 0) /* filter may consume */
 3161                         break;
 3162 
 3163                 if (pfil_member && ifp != NULL)
 3164                         error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp,
 3165                                         dir, NULL);
 3166 
 3167                 if (*mp == NULL || error != 0) /* filter may consume */
 3168                         break;
 3169 
 3170                 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
 3171                         error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
 3172                                         dir, NULL);
 3173 
 3174                 if (*mp == NULL || error != 0) /* filter may consume */
 3175                         break;
 3176 
 3177                 /* check if we need to fragment the packet */
 3178                 if (pfil_member && ifp != NULL && dir == PFIL_OUT) {
 3179                         i = (*mp)->m_pkthdr.len;
 3180                         if (i > ifp->if_mtu) {
 3181                                 error = bridge_fragment(ifp, *mp, &eh2, snap,
 3182                                             &llc1);
 3183                                 return (error);
 3184                         }
 3185                 }
 3186 
 3187                 /* Recalculate the ip checksum. */
 3188                 ip = mtod(*mp, struct ip *);
 3189                 hlen = ip->ip_hl << 2;
 3190                 if (hlen < sizeof(struct ip))
 3191                         goto bad;
 3192                 if (hlen > (*mp)->m_len) {
 3193                         if ((*mp = m_pullup(*mp, hlen)) == 0)
 3194                                 goto bad;
 3195                         ip = mtod(*mp, struct ip *);
 3196                         if (ip == NULL)
 3197                                 goto bad;
 3198                 }
 3199                 ip->ip_sum = 0;
 3200                 if (hlen == sizeof(struct ip))
 3201                         ip->ip_sum = in_cksum_hdr(ip);
 3202                 else
 3203                         ip->ip_sum = in_cksum(*mp, hlen);
 3204 
 3205                 break;
 3206 #ifdef INET6
 3207         case ETHERTYPE_IPV6:
 3208                 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
 3209                         error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
 3210                                         dir, NULL);
 3211 
 3212                 if (*mp == NULL || error != 0) /* filter may consume */
 3213                         break;
 3214 
 3215                 if (pfil_member && ifp != NULL)
 3216                         error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp,
 3217                                         dir, NULL);
 3218 
 3219                 if (*mp == NULL || error != 0) /* filter may consume */
 3220                         break;
 3221 
 3222                 if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
 3223                         error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
 3224                                         dir, NULL);
 3225                 break;
 3226 #endif
 3227         default:
 3228                 error = 0;
 3229                 break;
 3230         }
 3231 
 3232         if (*mp == NULL)
 3233                 return (error);
 3234         if (error != 0)
 3235                 goto bad;
 3236 
 3237         error = -1;
 3238 
 3239         /*
 3240          * Finally, put everything back the way it was and return
 3241          */
 3242         if (snap) {
 3243                 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT);
 3244                 if (*mp == NULL)
 3245                         return (error);
 3246                 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
 3247         }
 3248 
 3249         M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT);
 3250         if (*mp == NULL)
 3251                 return (error);
 3252         bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
 3253 
 3254         return (0);
 3255 
 3256 bad:
 3257         m_freem(*mp);
 3258         *mp = NULL;
 3259         return (error);
 3260 }
 3261 
 3262 /*
 3263  * Perform basic checks on header size since
 3264  * pfil assumes ip_input has already processed
 3265  * it for it.  Cut-and-pasted from ip_input.c.
 3266  * Given how simple the IPv6 version is,
 3267  * does the IPv4 version really need to be
 3268  * this complicated?
 3269  *
 3270  * XXX Should we update ipstat here, or not?
 3271  * XXX Right now we update ipstat but not
 3272  * XXX csum_counter.
 3273  */
 3274 static int
 3275 bridge_ip_checkbasic(struct mbuf **mp)
 3276 {
 3277         struct mbuf *m = *mp;
 3278         struct ip *ip;
 3279         int len, hlen;
 3280         u_short sum;
 3281 
 3282         if (*mp == NULL)
 3283                 return (-1);
 3284 
 3285         if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
 3286                 if ((m = m_copyup(m, sizeof(struct ip),
 3287                         (max_linkhdr + 3) & ~3)) == NULL) {
 3288                         /* XXXJRT new stat, please */
 3289                         KMOD_IPSTAT_INC(ips_toosmall);
 3290                         goto bad;
 3291                 }
 3292         } else if (__predict_false(m->m_len < sizeof (struct ip))) {
 3293                 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
 3294                         KMOD_IPSTAT_INC(ips_toosmall);
 3295                         goto bad;
 3296                 }
 3297         }
 3298         ip = mtod(m, struct ip *);
 3299         if (ip == NULL) goto bad;
 3300 
 3301         if (ip->ip_v != IPVERSION) {
 3302                 KMOD_IPSTAT_INC(ips_badvers);
 3303                 goto bad;
 3304         }
 3305         hlen = ip->ip_hl << 2;
 3306         if (hlen < sizeof(struct ip)) { /* minimum header length */
 3307                 KMOD_IPSTAT_INC(ips_badhlen);
 3308                 goto bad;
 3309         }
 3310         if (hlen > m->m_len) {
 3311                 if ((m = m_pullup(m, hlen)) == 0) {
 3312                         KMOD_IPSTAT_INC(ips_badhlen);
 3313                         goto bad;
 3314                 }
 3315                 ip = mtod(m, struct ip *);
 3316                 if (ip == NULL) goto bad;
 3317         }
 3318 
 3319         if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
 3320                 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
 3321         } else {
 3322                 if (hlen == sizeof(struct ip)) {
 3323                         sum = in_cksum_hdr(ip);
 3324                 } else {
 3325                         sum = in_cksum(m, hlen);
 3326                 }
 3327         }
 3328         if (sum) {
 3329                 KMOD_IPSTAT_INC(ips_badsum);
 3330                 goto bad;
 3331         }
 3332 
 3333         /* Retrieve the packet length. */
 3334         len = ntohs(ip->ip_len);
 3335 
 3336         /*
 3337          * Check for additional length bogosity
 3338          */
 3339         if (len < hlen) {
 3340                 KMOD_IPSTAT_INC(ips_badlen);
 3341                 goto bad;
 3342         }
 3343 
 3344         /*
 3345          * Check that the amount of data in the buffers
 3346          * is as at least much as the IP header would have us expect.
 3347          * Drop packet if shorter than we expect.
 3348          */
 3349         if (m->m_pkthdr.len < len) {
 3350                 KMOD_IPSTAT_INC(ips_tooshort);
 3351                 goto bad;
 3352         }
 3353 
 3354         /* Checks out, proceed */
 3355         *mp = m;
 3356         return (0);
 3357 
 3358 bad:
 3359         *mp = m;
 3360         return (-1);
 3361 }
 3362 
 3363 #ifdef INET6
 3364 /*
 3365  * Same as above, but for IPv6.
 3366  * Cut-and-pasted from ip6_input.c.
 3367  * XXX Should we update ip6stat, or not?
 3368  */
 3369 static int
 3370 bridge_ip6_checkbasic(struct mbuf **mp)
 3371 {
 3372         struct mbuf *m = *mp;
 3373         struct ip6_hdr *ip6;
 3374 
 3375         /*
 3376          * If the IPv6 header is not aligned, slurp it up into a new
 3377          * mbuf with space for link headers, in the event we forward
 3378          * it.  Otherwise, if it is aligned, make sure the entire base
 3379          * IPv6 header is in the first mbuf of the chain.
 3380          */
 3381         if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
 3382                 struct ifnet *inifp = m->m_pkthdr.rcvif;
 3383                 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
 3384                             (max_linkhdr + 3) & ~3)) == NULL) {
 3385                         /* XXXJRT new stat, please */
 3386                         IP6STAT_INC(ip6s_toosmall);
 3387                         in6_ifstat_inc(inifp, ifs6_in_hdrerr);
 3388                         goto bad;
 3389                 }
 3390         } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
 3391                 struct ifnet *inifp = m->m_pkthdr.rcvif;
 3392                 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
 3393                         IP6STAT_INC(ip6s_toosmall);
 3394                         in6_ifstat_inc(inifp, ifs6_in_hdrerr);
 3395                         goto bad;
 3396                 }
 3397         }
 3398 
 3399         ip6 = mtod(m, struct ip6_hdr *);
 3400 
 3401         if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
 3402                 IP6STAT_INC(ip6s_badvers);
 3403                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
 3404                 goto bad;
 3405         }
 3406 
 3407         /* Checks out, proceed */
 3408         *mp = m;
 3409         return (0);
 3410 
 3411 bad:
 3412         *mp = m;
 3413         return (-1);
 3414 }
 3415 #endif /* INET6 */
 3416 
 3417 /*
 3418  * bridge_fragment:
 3419  *
 3420  *      Return a fragmented mbuf chain.
 3421  */
 3422 static int
 3423 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh,
 3424     int snap, struct llc *llc)
 3425 {
 3426         struct mbuf *m0;
 3427         struct ip *ip;
 3428         int error = -1;
 3429 
 3430         if (m->m_len < sizeof(struct ip) &&
 3431             (m = m_pullup(m, sizeof(struct ip))) == NULL)
 3432                 goto out;
 3433         ip = mtod(m, struct ip *);
 3434 
 3435         m->m_pkthdr.csum_flags |= CSUM_IP;
 3436         error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist);
 3437         if (error)
 3438                 goto out;
 3439 
 3440         /* walk the chain and re-add the Ethernet header */
 3441         for (m0 = m; m0; m0 = m0->m_nextpkt) {
 3442                 if (error == 0) {
 3443                         if (snap) {
 3444                                 M_PREPEND(m0, sizeof(struct llc), M_NOWAIT);
 3445                                 if (m0 == NULL) {
 3446                                         error = ENOBUFS;
 3447                                         continue;
 3448                                 }
 3449                                 bcopy(llc, mtod(m0, caddr_t),
 3450                                     sizeof(struct llc));
 3451                         }
 3452                         M_PREPEND(m0, ETHER_HDR_LEN, M_NOWAIT);
 3453                         if (m0 == NULL) {
 3454                                 error = ENOBUFS;
 3455                                 continue;
 3456                         }
 3457                         bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN);
 3458                 } else
 3459                         m_freem(m);
 3460         }
 3461 
 3462         if (error == 0)
 3463                 KMOD_IPSTAT_INC(ips_fragmented);
 3464 
 3465         return (error);
 3466 
 3467 out:
 3468         if (m != NULL)
 3469                 m_freem(m);
 3470         return (error);
 3471 }
 3472 
 3473 static void
 3474 bridge_linkstate(struct ifnet *ifp)
 3475 {
 3476         struct bridge_softc *sc = ifp->if_bridge;
 3477         struct bridge_iflist *bif;
 3478 
 3479         BRIDGE_LOCK(sc);
 3480         bif = bridge_lookup_member_if(sc, ifp);
 3481         if (bif == NULL) {
 3482                 BRIDGE_UNLOCK(sc);
 3483                 return;
 3484         }
 3485         bridge_linkcheck(sc);
 3486         BRIDGE_UNLOCK(sc);
 3487 
 3488         bstp_linkstate(&bif->bif_stp);
 3489 }
 3490 
 3491 static void
 3492 bridge_linkcheck(struct bridge_softc *sc)
 3493 {
 3494         struct bridge_iflist *bif;
 3495         int new_link, hasls;
 3496 
 3497         BRIDGE_LOCK_ASSERT(sc);
 3498         new_link = LINK_STATE_DOWN;
 3499         hasls = 0;
 3500         /* Our link is considered up if at least one of our ports is active */
 3501         LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
 3502                 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
 3503                         hasls++;
 3504                 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
 3505                         new_link = LINK_STATE_UP;
 3506                         break;
 3507                 }
 3508         }
 3509         if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) {
 3510                 /* If no interfaces support link-state then we default to up */
 3511                 new_link = LINK_STATE_UP;
 3512         }
 3513         if_link_state_change(sc->sc_ifp, new_link);
 3514 }

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