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

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    1 /*
    2  * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
    3  * Copyright (c) 2003 Ryan McBride. All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   17  * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
   18  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   20  * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   22  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
   23  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   24  * THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include "opt_carp.h"
   31 #include "opt_bpf.h"
   32 #include "opt_inet.h"
   33 #include "opt_inet6.h"
   34 
   35 #include <sys/types.h>
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/conf.h>
   39 #include <sys/kernel.h>
   40 #include <sys/limits.h>
   41 #include <sys/malloc.h>
   42 #include <sys/mbuf.h>
   43 #include <sys/module.h>
   44 #include <sys/time.h>
   45 #include <sys/priv.h>
   46 #include <sys/proc.h>
   47 #include <sys/sysctl.h>
   48 #include <sys/syslog.h>
   49 #include <sys/signalvar.h>
   50 #include <sys/filio.h>
   51 #include <sys/sockio.h>
   52 
   53 #include <sys/socket.h>
   54 #include <sys/vnode.h>
   55 
   56 #include <machine/stdarg.h>
   57 
   58 #include <net/bpf.h>
   59 #include <net/ethernet.h>
   60 #include <net/fddi.h>
   61 #include <net/iso88025.h>
   62 #include <net/if.h>
   63 #include <net/if_clone.h>
   64 #include <net/if_dl.h>
   65 #include <net/if_types.h>
   66 #include <net/route.h>
   67 
   68 #ifdef INET
   69 #include <netinet/in.h>
   70 #include <netinet/in_var.h>
   71 #include <netinet/in_systm.h>
   72 #include <netinet/ip.h>
   73 #include <netinet/ip_var.h>
   74 #include <netinet/if_ether.h>
   75 #include <machine/in_cksum.h>
   76 #endif
   77 
   78 #ifdef INET6
   79 #include <netinet/icmp6.h>
   80 #include <netinet/ip6.h>
   81 #include <netinet6/ip6_var.h>
   82 #include <netinet6/scope6_var.h>
   83 #include <netinet6/nd6.h>
   84 #endif
   85 
   86 #include <crypto/sha1.h>
   87 #include <netinet/ip_carp.h>
   88 
   89 #define CARP_IFNAME     "carp"
   90 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces");
   91 SYSCTL_DECL(_net_inet_carp);
   92 
   93 struct carp_softc {
   94         struct ifnet            *sc_ifp;        /* Interface clue */
   95         struct ifnet            *sc_carpdev;    /* Pointer to parent interface */
   96         struct in_ifaddr        *sc_ia;         /* primary iface address */
   97         struct ip_moptions       sc_imo;
   98 #ifdef INET6
   99         struct in6_ifaddr       *sc_ia6;        /* primary iface address v6 */
  100         struct ip6_moptions      sc_im6o;
  101 #endif /* INET6 */
  102         TAILQ_ENTRY(carp_softc)  sc_list;
  103 
  104         enum { INIT = 0, BACKUP, MASTER }       sc_state;
  105 
  106         int                      sc_flags_backup;
  107         int                      sc_suppress;
  108 
  109         int                      sc_sendad_errors;
  110 #define CARP_SENDAD_MAX_ERRORS  3
  111         int                      sc_sendad_success;
  112 #define CARP_SENDAD_MIN_SUCCESS 3
  113 
  114         int                      sc_vhid;
  115         int                      sc_advskew;
  116         int                      sc_naddrs;
  117         int                      sc_naddrs6;
  118         int                      sc_advbase;    /* seconds */
  119         int                      sc_init_counter;
  120         u_int64_t                sc_counter;
  121 
  122         /* authentication */
  123 #define CARP_HMAC_PAD   64
  124         unsigned char sc_key[CARP_KEY_LEN];
  125         unsigned char sc_pad[CARP_HMAC_PAD];
  126         SHA1_CTX sc_sha1;
  127 
  128         struct callout           sc_ad_tmo;     /* advertisement timeout */
  129         struct callout           sc_md_tmo;     /* master down timeout */
  130         struct callout           sc_md6_tmo;    /* master down timeout */
  131         
  132         LIST_ENTRY(carp_softc)   sc_next;       /* Interface clue */
  133 };
  134 #define SC2IFP(sc)      ((sc)->sc_ifp)
  135 
  136 int carp_suppress_preempt = 0;
  137 int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 };    /* XXX for now */
  138 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW,
  139     &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets");
  140 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW,
  141     &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode");
  142 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW,
  143     &carp_opts[CARPCTL_LOG], 0, "log bad carp packets");
  144 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW,
  145     &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses");
  146 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD,
  147     &carp_suppress_preempt, 0, "Preemption is suppressed");
  148 
  149 struct carpstats carpstats;
  150 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW,
  151     &carpstats, carpstats,
  152     "CARP statistics (struct carpstats, netinet/ip_carp.h)");
  153 
  154 struct carp_if {
  155         TAILQ_HEAD(, carp_softc) vhif_vrs;
  156         int vhif_nvrs;
  157 
  158         struct ifnet    *vhif_ifp;
  159         struct mtx       vhif_mtx;
  160 };
  161 
  162 /* Get carp_if from softc. Valid after carp_set_addr{,6}. */
  163 #define SC2CIF(sc)              ((struct carp_if *)(sc)->sc_carpdev->if_carp)
  164 
  165 /* lock per carp_if queue */
  166 #define CARP_LOCK_INIT(cif)     mtx_init(&(cif)->vhif_mtx, "carp_if",   \
  167         NULL, MTX_DEF)
  168 #define CARP_LOCK_DESTROY(cif)  mtx_destroy(&(cif)->vhif_mtx)
  169 #define CARP_LOCK_ASSERT(cif)   mtx_assert(&(cif)->vhif_mtx, MA_OWNED)
  170 #define CARP_LOCK(cif)          mtx_lock(&(cif)->vhif_mtx)
  171 #define CARP_UNLOCK(cif)        mtx_unlock(&(cif)->vhif_mtx)
  172 
  173 #define CARP_SCLOCK(sc)         mtx_lock(&SC2CIF(sc)->vhif_mtx)
  174 #define CARP_SCUNLOCK(sc)       mtx_unlock(&SC2CIF(sc)->vhif_mtx)
  175 #define CARP_SCLOCK_ASSERT(sc)  mtx_assert(&SC2CIF(sc)->vhif_mtx, MA_OWNED)
  176 
  177 #define CARP_LOG(...)   do {                            \
  178         if (carp_opts[CARPCTL_LOG] > 0)                 \
  179                 log(LOG_INFO, __VA_ARGS__);             \
  180 } while (0)
  181 
  182 #define CARP_DEBUG(...) do {                            \
  183         if (carp_opts[CARPCTL_LOG] > 1)                 \
  184                 log(LOG_DEBUG, __VA_ARGS__);            \
  185 } while (0)
  186 
  187 static void     carp_hmac_prepare(struct carp_softc *);
  188 static void     carp_hmac_generate(struct carp_softc *, u_int32_t *,
  189                     unsigned char *);
  190 static int      carp_hmac_verify(struct carp_softc *, u_int32_t *,
  191                     unsigned char *);
  192 static void     carp_setroute(struct carp_softc *, int);
  193 static void     carp_input_c(struct mbuf *, struct carp_header *, sa_family_t);
  194 static int      carp_clone_create(struct if_clone *, int, caddr_t);
  195 static void     carp_clone_destroy(struct ifnet *);
  196 static void     carpdetach(struct carp_softc *, int);
  197 static int      carp_prepare_ad(struct mbuf *, struct carp_softc *,
  198                     struct carp_header *);
  199 static void     carp_send_ad_all(void);
  200 static void     carp_send_ad(void *);
  201 static void     carp_send_ad_locked(struct carp_softc *);
  202 static void     carp_send_arp(struct carp_softc *);
  203 static void     carp_master_down(void *);
  204 static void     carp_master_down_locked(struct carp_softc *);
  205 static int      carp_ioctl(struct ifnet *, u_long, caddr_t);
  206 static int      carp_looutput(struct ifnet *, struct mbuf *, struct sockaddr *,
  207                     struct rtentry *);
  208 static void     carp_start(struct ifnet *);
  209 static void     carp_setrun(struct carp_softc *, sa_family_t);
  210 static void     carp_set_state(struct carp_softc *, int);
  211 static int      carp_addrcount(struct carp_if *, struct in_ifaddr *, int);
  212 enum    { CARP_COUNT_MASTER, CARP_COUNT_RUNNING };
  213 
  214 static void     carp_multicast_cleanup(struct carp_softc *);
  215 static int      carp_set_addr(struct carp_softc *, struct sockaddr_in *);
  216 static int      carp_del_addr(struct carp_softc *, struct sockaddr_in *);
  217 static void     carp_carpdev_state_locked(struct carp_if *);
  218 static void     carp_sc_state_locked(struct carp_softc *);
  219 #ifdef INET6
  220 static void     carp_send_na(struct carp_softc *);
  221 static int      carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *);
  222 static int      carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *);
  223 static void     carp_multicast6_cleanup(struct carp_softc *);
  224 #endif
  225 
  226 static LIST_HEAD(, carp_softc) carpif_list;
  227 static struct mtx carp_mtx;
  228 IFC_SIMPLE_DECLARE(carp, 0);
  229 
  230 static eventhandler_tag if_detach_event_tag;
  231 
  232 static __inline u_int16_t
  233 carp_cksum(struct mbuf *m, int len)
  234 {
  235         return (in_cksum(m, len));
  236 }
  237 
  238 static void
  239 carp_hmac_prepare(struct carp_softc *sc)
  240 {
  241         u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
  242         u_int8_t vhid = sc->sc_vhid & 0xff;
  243         struct ifaddr *ifa;
  244         int i, found;
  245 #ifdef INET
  246         struct in_addr last, cur, in;
  247 #endif
  248 #ifdef INET6
  249         struct in6_addr last6, cur6, in6;
  250 #endif
  251 
  252         if (sc->sc_carpdev)
  253                 CARP_SCLOCK(sc);
  254 
  255         /* XXX: possible race here */
  256 
  257         /* compute ipad from key */
  258         bzero(sc->sc_pad, sizeof(sc->sc_pad));
  259         bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
  260         for (i = 0; i < sizeof(sc->sc_pad); i++)
  261                 sc->sc_pad[i] ^= 0x36;
  262 
  263         /* precompute first part of inner hash */
  264         SHA1Init(&sc->sc_sha1);
  265         SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
  266         SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
  267         SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
  268         SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
  269 #ifdef INET
  270         cur.s_addr = 0;
  271         do {
  272                 found = 0;
  273                 last = cur;
  274                 cur.s_addr = 0xffffffff;
  275                 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
  276                         in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr;
  277                         if (ifa->ifa_addr->sa_family == AF_INET &&
  278                             ntohl(in.s_addr) > ntohl(last.s_addr) &&
  279                             ntohl(in.s_addr) < ntohl(cur.s_addr)) {
  280                                 cur.s_addr = in.s_addr;
  281                                 found++;
  282                         }
  283                 }
  284                 if (found)
  285                         SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur));
  286         } while (found);
  287 #endif /* INET */
  288 #ifdef INET6
  289         memset(&cur6, 0, sizeof(cur6));
  290         do {
  291                 found = 0;
  292                 last6 = cur6;
  293                 memset(&cur6, 0xff, sizeof(cur6));
  294                 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
  295                         in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
  296                         if (IN6_IS_SCOPE_EMBED(&in6))
  297                                 in6.s6_addr16[1] = 0;
  298                         if (ifa->ifa_addr->sa_family == AF_INET6 &&
  299                             memcmp(&in6, &last6, sizeof(in6)) > 0 &&
  300                             memcmp(&in6, &cur6, sizeof(in6)) < 0) {
  301                                 cur6 = in6;
  302                                 found++;
  303                         }
  304                 }
  305                 if (found)
  306                         SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6));
  307         } while (found);
  308 #endif /* INET6 */
  309 
  310         /* convert ipad to opad */
  311         for (i = 0; i < sizeof(sc->sc_pad); i++)
  312                 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
  313 
  314         if (sc->sc_carpdev)
  315                 CARP_SCUNLOCK(sc);
  316 }
  317 
  318 static void
  319 carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2],
  320     unsigned char md[20])
  321 {
  322         SHA1_CTX sha1ctx;
  323 
  324         /* fetch first half of inner hash */
  325         bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
  326 
  327         SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
  328         SHA1Final(md, &sha1ctx);
  329 
  330         /* outer hash */
  331         SHA1Init(&sha1ctx);
  332         SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
  333         SHA1Update(&sha1ctx, md, 20);
  334         SHA1Final(md, &sha1ctx);
  335 }
  336 
  337 static int
  338 carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2],
  339     unsigned char md[20])
  340 {
  341         unsigned char md2[20];
  342 
  343         CARP_SCLOCK_ASSERT(sc);
  344 
  345         carp_hmac_generate(sc, counter, md2);
  346 
  347         return (bcmp(md, md2, sizeof(md2)));
  348 }
  349 
  350 static void
  351 carp_setroute(struct carp_softc *sc, int cmd)
  352 {
  353         struct ifaddr *ifa;
  354         int s;
  355 
  356         if (sc->sc_carpdev)
  357                 CARP_SCLOCK_ASSERT(sc);
  358 
  359         s = splnet();
  360         TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
  361                 if (ifa->ifa_addr->sa_family == AF_INET &&
  362                     sc->sc_carpdev != NULL) {
  363                         int count = carp_addrcount(
  364                             (struct carp_if *)sc->sc_carpdev->if_carp,
  365                             ifatoia(ifa), CARP_COUNT_MASTER);
  366 
  367                         if ((cmd == RTM_ADD && count == 1) ||
  368                             (cmd == RTM_DELETE && count == 0))
  369                                 rtinit(ifa, cmd, RTF_UP | RTF_HOST);
  370                 }
  371 #ifdef INET6
  372                 if (ifa->ifa_addr->sa_family == AF_INET6) {
  373                         if (cmd == RTM_ADD)
  374                                 in6_ifaddloop(ifa);
  375                         else
  376                                 in6_ifremloop(ifa);
  377                 }
  378 #endif /* INET6 */
  379         }
  380         splx(s);
  381 }
  382 
  383 static int
  384 carp_clone_create(struct if_clone *ifc, int unit, caddr_t params)
  385 {
  386 
  387         struct carp_softc *sc;
  388         struct ifnet *ifp;
  389 
  390         MALLOC(sc, struct carp_softc *, sizeof(*sc), M_CARP, M_WAITOK|M_ZERO);
  391         ifp = SC2IFP(sc) = if_alloc(IFT_ETHER);
  392         if (ifp == NULL) {
  393                 FREE(sc, M_CARP);
  394                 return (ENOSPC);
  395         }
  396         
  397         sc->sc_flags_backup = 0;
  398         sc->sc_suppress = 0;
  399         sc->sc_advbase = CARP_DFLTINTV;
  400         sc->sc_vhid = -1;       /* required setting */
  401         sc->sc_advskew = 0;
  402         sc->sc_init_counter = 1;
  403         sc->sc_naddrs = sc->sc_naddrs6 = 0; /* M_ZERO? */
  404 #ifdef INET6
  405         sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
  406 #endif
  407         sc->sc_imo.imo_membership = (struct in_multi **)malloc(
  408             (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP,
  409             M_WAITOK);
  410         sc->sc_imo.imo_mfilters = NULL;
  411         sc->sc_imo.imo_max_memberships = IP_MIN_MEMBERSHIPS;
  412         sc->sc_imo.imo_multicast_vif = -1;
  413 
  414         callout_init(&sc->sc_ad_tmo, CALLOUT_MPSAFE);
  415         callout_init(&sc->sc_md_tmo, CALLOUT_MPSAFE);
  416         callout_init(&sc->sc_md6_tmo, CALLOUT_MPSAFE);
  417         
  418         ifp->if_softc = sc;
  419         if_initname(ifp, CARP_IFNAME, unit);
  420         ifp->if_mtu = ETHERMTU;
  421         ifp->if_flags = IFF_LOOPBACK;
  422         ifp->if_ioctl = carp_ioctl;
  423         ifp->if_output = carp_looutput;
  424         ifp->if_start = carp_start;
  425         ifp->if_type = IFT_CARP;
  426         ifp->if_snd.ifq_maxlen = ifqmaxlen;
  427         ifp->if_hdrlen = 0;
  428         if_attach(ifp);
  429         bpfattach(SC2IFP(sc), DLT_NULL, sizeof(u_int32_t));
  430         mtx_lock(&carp_mtx);
  431         LIST_INSERT_HEAD(&carpif_list, sc, sc_next);
  432         mtx_unlock(&carp_mtx);
  433         return (0);
  434 }
  435 
  436 static void
  437 carp_clone_destroy(struct ifnet *ifp)
  438 {
  439         struct carp_softc *sc = ifp->if_softc;
  440 
  441         if (sc->sc_carpdev)
  442                 CARP_SCLOCK(sc);
  443         carpdetach(sc, 1);      /* Returns unlocked. */
  444 
  445         mtx_lock(&carp_mtx);
  446         LIST_REMOVE(sc, sc_next);
  447         mtx_unlock(&carp_mtx);
  448         bpfdetach(ifp);
  449         if_detach(ifp);
  450         if_free_type(ifp, IFT_ETHER);
  451         free(sc->sc_imo.imo_membership, M_CARP);
  452         free(sc, M_CARP);
  453 }
  454 
  455 /*
  456  * This function can be called on CARP interface destroy path,
  457  * and in case of the removal of the underlying interface as
  458  * well. We differentiate these two cases. In the latter case
  459  * we do not cleanup our multicast memberships, since they
  460  * are already freed. Also, in the latter case we do not
  461  * release the lock on return, because the function will be
  462  * called once more, for another CARP instance on the same
  463  * interface.
  464  */
  465 static void
  466 carpdetach(struct carp_softc *sc, int unlock)
  467 {
  468         struct carp_if *cif;
  469 
  470         callout_stop(&sc->sc_ad_tmo);
  471         callout_stop(&sc->sc_md_tmo);
  472         callout_stop(&sc->sc_md6_tmo);
  473 
  474         if (sc->sc_suppress)
  475                 carp_suppress_preempt--;
  476         sc->sc_suppress = 0;
  477 
  478         if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
  479                 carp_suppress_preempt--;
  480         sc->sc_sendad_errors = 0;
  481 
  482         carp_set_state(sc, INIT);
  483         SC2IFP(sc)->if_flags &= ~IFF_UP;
  484         carp_setrun(sc, 0);
  485         if (unlock)
  486                 carp_multicast_cleanup(sc);
  487 #ifdef INET6
  488         carp_multicast6_cleanup(sc);
  489 #endif
  490 
  491         if (sc->sc_carpdev != NULL) {
  492                 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
  493                 CARP_LOCK_ASSERT(cif);
  494                 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
  495                 if (!--cif->vhif_nvrs) {
  496                         ifpromisc(sc->sc_carpdev, 0);
  497                         sc->sc_carpdev->if_carp = NULL;
  498                         CARP_LOCK_DESTROY(cif);
  499                         FREE(cif, M_IFADDR);
  500                 } else if (unlock)
  501                         CARP_UNLOCK(cif);
  502                 sc->sc_carpdev = NULL;
  503         }
  504 }
  505 
  506 /* Detach an interface from the carp. */
  507 static void
  508 carp_ifdetach(void *arg __unused, struct ifnet *ifp)
  509 {
  510         struct carp_if *cif = (struct carp_if *)ifp->if_carp;
  511         struct carp_softc *sc, *nextsc;
  512 
  513         if (cif == NULL)
  514                 return;
  515 
  516         /*
  517          * XXX: At the end of for() cycle the lock will be destroyed.
  518          */
  519         CARP_LOCK(cif);
  520         for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) {
  521                 nextsc = TAILQ_NEXT(sc, sc_list);
  522                 carpdetach(sc, 0);
  523         }
  524 }
  525 
  526 /*
  527  * process input packet.
  528  * we have rearranged checks order compared to the rfc,
  529  * but it seems more efficient this way or not possible otherwise.
  530  */
  531 void
  532 carp_input(struct mbuf *m, int hlen)
  533 {
  534         struct ip *ip = mtod(m, struct ip *);
  535         struct carp_header *ch;
  536         int iplen, len;
  537 
  538         carpstats.carps_ipackets++;
  539 
  540         if (!carp_opts[CARPCTL_ALLOW]) {
  541                 m_freem(m);
  542                 return;
  543         }
  544 
  545         /* check if received on a valid carp interface */
  546         if (m->m_pkthdr.rcvif->if_carp == NULL) {
  547                 carpstats.carps_badif++;
  548                 CARP_LOG("carp_input: packet received on non-carp "
  549                     "interface: %s\n",
  550                     m->m_pkthdr.rcvif->if_xname);
  551                 m_freem(m);
  552                 return;
  553         }
  554 
  555         /* verify that the IP TTL is 255.  */
  556         if (ip->ip_ttl != CARP_DFLTTL) {
  557                 carpstats.carps_badttl++;
  558                 CARP_LOG("carp_input: received ttl %d != 255i on %s\n",
  559                     ip->ip_ttl,
  560                     m->m_pkthdr.rcvif->if_xname);
  561                 m_freem(m);
  562                 return;
  563         }
  564 
  565         iplen = ip->ip_hl << 2;
  566 
  567         if (m->m_pkthdr.len < iplen + sizeof(*ch)) {
  568                 carpstats.carps_badlen++;
  569                 CARP_LOG("carp_input: received len %zd < "
  570                     "sizeof(struct carp_header)\n",
  571                     m->m_len - sizeof(struct ip));
  572                 m_freem(m);
  573                 return;
  574         }
  575 
  576         if (iplen + sizeof(*ch) < m->m_len) {
  577                 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) {
  578                         carpstats.carps_hdrops++;
  579                         CARP_LOG("carp_input: pullup failed\n");
  580                         return;
  581                 }
  582                 ip = mtod(m, struct ip *);
  583         }
  584         ch = (struct carp_header *)((char *)ip + iplen);
  585 
  586         /*
  587          * verify that the received packet length is
  588          * equal to the CARP header
  589          */
  590         len = iplen + sizeof(*ch);
  591         if (len > m->m_pkthdr.len) {
  592                 carpstats.carps_badlen++;
  593                 CARP_LOG("carp_input: packet too short %d on %s\n",
  594                     m->m_pkthdr.len,
  595                     m->m_pkthdr.rcvif->if_xname);
  596                 m_freem(m);
  597                 return;
  598         }
  599 
  600         if ((m = m_pullup(m, len)) == NULL) {
  601                 carpstats.carps_hdrops++;
  602                 return;
  603         }
  604         ip = mtod(m, struct ip *);
  605         ch = (struct carp_header *)((char *)ip + iplen);
  606 
  607         /* verify the CARP checksum */
  608         m->m_data += iplen;
  609         if (carp_cksum(m, len - iplen)) {
  610                 carpstats.carps_badsum++;
  611                 CARP_LOG("carp_input: checksum failed on %s\n",
  612                     m->m_pkthdr.rcvif->if_xname);
  613                 m_freem(m);
  614                 return;
  615         }
  616         m->m_data -= iplen;
  617 
  618         carp_input_c(m, ch, AF_INET);
  619 }
  620 
  621 #ifdef INET6
  622 int
  623 carp6_input(struct mbuf **mp, int *offp, int proto)
  624 {
  625         struct mbuf *m = *mp;
  626         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
  627         struct carp_header *ch;
  628         u_int len;
  629 
  630         carpstats.carps_ipackets6++;
  631 
  632         if (!carp_opts[CARPCTL_ALLOW]) {
  633                 m_freem(m);
  634                 return (IPPROTO_DONE);
  635         }
  636 
  637         /* check if received on a valid carp interface */
  638         if (m->m_pkthdr.rcvif->if_carp == NULL) {
  639                 carpstats.carps_badif++;
  640                 CARP_LOG("carp6_input: packet received on non-carp "
  641                     "interface: %s\n",
  642                     m->m_pkthdr.rcvif->if_xname);
  643                 m_freem(m);
  644                 return (IPPROTO_DONE);
  645         }
  646 
  647         /* verify that the IP TTL is 255 */
  648         if (ip6->ip6_hlim != CARP_DFLTTL) {
  649                 carpstats.carps_badttl++;
  650                 CARP_LOG("carp6_input: received ttl %d != 255 on %s\n",
  651                     ip6->ip6_hlim,
  652                     m->m_pkthdr.rcvif->if_xname);
  653                 m_freem(m);
  654                 return (IPPROTO_DONE);
  655         }
  656 
  657         /* verify that we have a complete carp packet */
  658         len = m->m_len;
  659         IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
  660         if (ch == NULL) {
  661                 carpstats.carps_badlen++;
  662                 CARP_LOG("carp6_input: packet size %u too small\n", len);
  663                 return (IPPROTO_DONE);
  664         }
  665 
  666 
  667         /* verify the CARP checksum */
  668         m->m_data += *offp;
  669         if (carp_cksum(m, sizeof(*ch))) {
  670                 carpstats.carps_badsum++;
  671                 CARP_LOG("carp6_input: checksum failed, on %s\n",
  672                     m->m_pkthdr.rcvif->if_xname);
  673                 m_freem(m);
  674                 return (IPPROTO_DONE);
  675         }
  676         m->m_data -= *offp;
  677 
  678         carp_input_c(m, ch, AF_INET6);
  679         return (IPPROTO_DONE);
  680 }
  681 #endif /* INET6 */
  682 
  683 static void
  684 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af)
  685 {
  686         struct ifnet *ifp = m->m_pkthdr.rcvif;
  687         struct carp_softc *sc;
  688         u_int64_t tmp_counter;
  689         struct timeval sc_tv, ch_tv;
  690 
  691         /* verify that the VHID is valid on the receiving interface */
  692         CARP_LOCK(ifp->if_carp);
  693         TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list)
  694                 if (sc->sc_vhid == ch->carp_vhid)
  695                         break;
  696 
  697         if (!sc || !((SC2IFP(sc)->if_flags & IFF_UP) &&
  698             (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) {
  699                 carpstats.carps_badvhid++;
  700                 CARP_UNLOCK(ifp->if_carp);
  701                 m_freem(m);
  702                 return;
  703         }
  704 
  705         getmicrotime(&SC2IFP(sc)->if_lastchange);
  706         SC2IFP(sc)->if_ipackets++;
  707         SC2IFP(sc)->if_ibytes += m->m_pkthdr.len;
  708 
  709         if (bpf_peers_present(SC2IFP(sc)->if_bpf)) {
  710                 struct ip *ip = mtod(m, struct ip *);
  711                 uint32_t af1 = af;
  712 
  713                 /* BPF wants net byte order */
  714                 ip->ip_len = htons(ip->ip_len + (ip->ip_hl << 2));
  715                 ip->ip_off = htons(ip->ip_off);
  716                 bpf_mtap2(SC2IFP(sc)->if_bpf, &af1, sizeof(af1), m);
  717         }
  718 
  719         /* verify the CARP version. */
  720         if (ch->carp_version != CARP_VERSION) {
  721                 carpstats.carps_badver++;
  722                 SC2IFP(sc)->if_ierrors++;
  723                 CARP_UNLOCK(ifp->if_carp);
  724                 CARP_LOG("%s; invalid version %d\n",
  725                     SC2IFP(sc)->if_xname,
  726                     ch->carp_version);
  727                 m_freem(m);
  728                 return;
  729         }
  730 
  731         /* verify the hash */
  732         if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
  733                 carpstats.carps_badauth++;
  734                 SC2IFP(sc)->if_ierrors++;
  735                 CARP_UNLOCK(ifp->if_carp);
  736                 CARP_LOG("%s: incorrect hash\n", SC2IFP(sc)->if_xname);
  737                 m_freem(m);
  738                 return;
  739         }
  740 
  741         tmp_counter = ntohl(ch->carp_counter[0]);
  742         tmp_counter = tmp_counter<<32;
  743         tmp_counter += ntohl(ch->carp_counter[1]);
  744 
  745         /* XXX Replay protection goes here */
  746 
  747         sc->sc_init_counter = 0;
  748         sc->sc_counter = tmp_counter;
  749 
  750         sc_tv.tv_sec = sc->sc_advbase;
  751         if (carp_suppress_preempt && sc->sc_advskew <  240)
  752                 sc_tv.tv_usec = 240 * 1000000 / 256;
  753         else
  754                 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256;
  755         ch_tv.tv_sec = ch->carp_advbase;
  756         ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
  757 
  758         switch (sc->sc_state) {
  759         case INIT:
  760                 break;
  761         case MASTER:
  762                 /*
  763                  * If we receive an advertisement from a master who's going to
  764                  * be more frequent than us, go into BACKUP state.
  765                  */
  766                 if (timevalcmp(&sc_tv, &ch_tv, >) ||
  767                     timevalcmp(&sc_tv, &ch_tv, ==)) {
  768                         callout_stop(&sc->sc_ad_tmo);
  769                         CARP_DEBUG("%s: MASTER -> BACKUP "
  770                            "(more frequent advertisement received)\n",
  771                            SC2IFP(sc)->if_xname);
  772                         carp_set_state(sc, BACKUP);
  773                         carp_setrun(sc, 0);
  774                         carp_setroute(sc, RTM_DELETE);
  775                 }
  776                 break;
  777         case BACKUP:
  778                 /*
  779                  * If we're pre-empting masters who advertise slower than us,
  780                  * and this one claims to be slower, treat him as down.
  781                  */
  782                 if (carp_opts[CARPCTL_PREEMPT] &&
  783                     timevalcmp(&sc_tv, &ch_tv, <)) {
  784                         CARP_DEBUG("%s: BACKUP -> MASTER "
  785                             "(preempting a slower master)\n",
  786                             SC2IFP(sc)->if_xname);
  787                         carp_master_down_locked(sc);
  788                         break;
  789                 }
  790 
  791                 /*
  792                  *  If the master is going to advertise at such a low frequency
  793                  *  that he's guaranteed to time out, we'd might as well just
  794                  *  treat him as timed out now.
  795                  */
  796                 sc_tv.tv_sec = sc->sc_advbase * 3;
  797                 if (timevalcmp(&sc_tv, &ch_tv, <)) {
  798                         CARP_DEBUG("%s: BACKUP -> MASTER "
  799                             "(master timed out)\n",
  800                             SC2IFP(sc)->if_xname);
  801                         carp_master_down_locked(sc);
  802                         break;
  803                 }
  804 
  805                 /*
  806                  * Otherwise, we reset the counter and wait for the next
  807                  * advertisement.
  808                  */
  809                 carp_setrun(sc, af);
  810                 break;
  811         }
  812 
  813         CARP_UNLOCK(ifp->if_carp);
  814 
  815         m_freem(m);
  816         return;
  817 }
  818 
  819 static int
  820 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch)
  821 {
  822         struct m_tag *mtag;
  823         struct ifnet *ifp = SC2IFP(sc);
  824 
  825         if (sc->sc_init_counter) {
  826                 /* this could also be seconds since unix epoch */
  827                 sc->sc_counter = arc4random();
  828                 sc->sc_counter = sc->sc_counter << 32;
  829                 sc->sc_counter += arc4random();
  830         } else
  831                 sc->sc_counter++;
  832 
  833         ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff);
  834         ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff);
  835 
  836         carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
  837 
  838         /* Tag packet for carp_output */
  839         mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct ifnet *), M_NOWAIT);
  840         if (mtag == NULL) {
  841                 m_freem(m);
  842                 SC2IFP(sc)->if_oerrors++;
  843                 return (ENOMEM);
  844         }
  845         bcopy(&ifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *));
  846         m_tag_prepend(m, mtag);
  847 
  848         return (0);
  849 }
  850 
  851 static void
  852 carp_send_ad_all(void)
  853 {
  854         struct carp_softc *sc;
  855 
  856         mtx_lock(&carp_mtx);
  857         LIST_FOREACH(sc, &carpif_list, sc_next) {
  858                 if (sc->sc_carpdev == NULL)
  859                         continue;
  860                 CARP_SCLOCK(sc);
  861                 if ((SC2IFP(sc)->if_flags & IFF_UP) &&
  862                     (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING) &&
  863                      sc->sc_state == MASTER)
  864                         carp_send_ad_locked(sc);
  865                 CARP_SCUNLOCK(sc);
  866         }
  867         mtx_unlock(&carp_mtx);
  868 }
  869 
  870 static void
  871 carp_send_ad(void *v)
  872 {
  873         struct carp_softc *sc = v;
  874 
  875         CARP_SCLOCK(sc);
  876         carp_send_ad_locked(sc);
  877         CARP_SCUNLOCK(sc);
  878 }
  879 
  880 static void
  881 carp_send_ad_locked(struct carp_softc *sc)
  882 {
  883         struct carp_header ch;
  884         struct timeval tv;
  885         struct carp_header *ch_ptr;
  886         struct mbuf *m;
  887         int len, advbase, advskew;
  888 
  889         CARP_SCLOCK_ASSERT(sc);
  890 
  891         /* bow out if we've lost our UPness or RUNNINGuiness */
  892         if (!((SC2IFP(sc)->if_flags & IFF_UP) &&
  893             (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) {
  894                 advbase = 255;
  895                 advskew = 255;
  896         } else {
  897                 advbase = sc->sc_advbase;
  898                 if (!carp_suppress_preempt || sc->sc_advskew > 240)
  899                         advskew = sc->sc_advskew;
  900                 else
  901                         advskew = 240;
  902                 tv.tv_sec = advbase;
  903                 tv.tv_usec = advskew * 1000000 / 256;
  904         }
  905 
  906         ch.carp_version = CARP_VERSION;
  907         ch.carp_type = CARP_ADVERTISEMENT;
  908         ch.carp_vhid = sc->sc_vhid;
  909         ch.carp_advbase = advbase;
  910         ch.carp_advskew = advskew;
  911         ch.carp_authlen = 7;    /* XXX DEFINE */
  912         ch.carp_pad1 = 0;       /* must be zero */
  913         ch.carp_cksum = 0;
  914 
  915 #ifdef INET
  916         if (sc->sc_ia) {
  917                 struct ip *ip;
  918 
  919                 MGETHDR(m, M_DONTWAIT, MT_HEADER);
  920                 if (m == NULL) {
  921                         SC2IFP(sc)->if_oerrors++;
  922                         carpstats.carps_onomem++;
  923                         /* XXX maybe less ? */
  924                         if (advbase != 255 || advskew != 255)
  925                                 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
  926                                     carp_send_ad, sc);
  927                         return;
  928                 }
  929                 len = sizeof(*ip) + sizeof(ch);
  930                 m->m_pkthdr.len = len;
  931                 m->m_pkthdr.rcvif = NULL;
  932                 m->m_len = len;
  933                 MH_ALIGN(m, m->m_len);
  934                 m->m_flags |= M_MCAST;
  935                 ip = mtod(m, struct ip *);
  936                 ip->ip_v = IPVERSION;
  937                 ip->ip_hl = sizeof(*ip) >> 2;
  938                 ip->ip_tos = IPTOS_LOWDELAY;
  939                 ip->ip_len = len;
  940                 ip->ip_id = ip_newid();
  941                 ip->ip_off = IP_DF;
  942                 ip->ip_ttl = CARP_DFLTTL;
  943                 ip->ip_p = IPPROTO_CARP;
  944                 ip->ip_sum = 0;
  945                 ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr;
  946                 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
  947 
  948                 ch_ptr = (struct carp_header *)(&ip[1]);
  949                 bcopy(&ch, ch_ptr, sizeof(ch));
  950                 if (carp_prepare_ad(m, sc, ch_ptr))
  951                         return;
  952 
  953                 m->m_data += sizeof(*ip);
  954                 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip));
  955                 m->m_data -= sizeof(*ip);
  956 
  957                 getmicrotime(&SC2IFP(sc)->if_lastchange);
  958                 SC2IFP(sc)->if_opackets++;
  959                 SC2IFP(sc)->if_obytes += len;
  960                 carpstats.carps_opackets++;
  961 
  962                 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) {
  963                         SC2IFP(sc)->if_oerrors++;
  964                         if (sc->sc_sendad_errors < INT_MAX)
  965                                 sc->sc_sendad_errors++;
  966                         if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
  967                                 carp_suppress_preempt++;
  968                                 if (carp_suppress_preempt == 1) {
  969                                         CARP_SCUNLOCK(sc);
  970                                         carp_send_ad_all();
  971                                         CARP_SCLOCK(sc);
  972                                 }
  973                         }
  974                         sc->sc_sendad_success = 0;
  975                 } else {
  976                         if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
  977                                 if (++sc->sc_sendad_success >=
  978                                     CARP_SENDAD_MIN_SUCCESS) {
  979                                         carp_suppress_preempt--;
  980                                         sc->sc_sendad_errors = 0;
  981                                 }
  982                         } else
  983                                 sc->sc_sendad_errors = 0;
  984                 }
  985         }
  986 #endif /* INET */
  987 #ifdef INET6
  988         if (sc->sc_ia6) {
  989                 struct ip6_hdr *ip6;
  990 
  991                 MGETHDR(m, M_DONTWAIT, MT_HEADER);
  992                 if (m == NULL) {
  993                         SC2IFP(sc)->if_oerrors++;
  994                         carpstats.carps_onomem++;
  995                         /* XXX maybe less ? */
  996                         if (advbase != 255 || advskew != 255)
  997                                 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
  998                                     carp_send_ad, sc);
  999                         return;
 1000                 }
 1001                 len = sizeof(*ip6) + sizeof(ch);
 1002                 m->m_pkthdr.len = len;
 1003                 m->m_pkthdr.rcvif = NULL;
 1004                 m->m_len = len;
 1005                 MH_ALIGN(m, m->m_len);
 1006                 m->m_flags |= M_MCAST;
 1007                 ip6 = mtod(m, struct ip6_hdr *);
 1008                 bzero(ip6, sizeof(*ip6));
 1009                 ip6->ip6_vfc |= IPV6_VERSION;
 1010                 ip6->ip6_hlim = CARP_DFLTTL;
 1011                 ip6->ip6_nxt = IPPROTO_CARP;
 1012                 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src,
 1013                     sizeof(struct in6_addr));
 1014                 /* set the multicast destination */
 1015 
 1016                 ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
 1017                 ip6->ip6_dst.s6_addr8[15] = 0x12;
 1018                 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
 1019                         SC2IFP(sc)->if_oerrors++;
 1020                         m_freem(m);
 1021                         CARP_LOG("%s: in6_setscope failed\n", __func__);
 1022                         return;
 1023                 }
 1024 
 1025                 ch_ptr = (struct carp_header *)(&ip6[1]);
 1026                 bcopy(&ch, ch_ptr, sizeof(ch));
 1027                 if (carp_prepare_ad(m, sc, ch_ptr))
 1028                         return;
 1029 
 1030                 m->m_data += sizeof(*ip6);
 1031                 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6));
 1032                 m->m_data -= sizeof(*ip6);
 1033 
 1034                 getmicrotime(&SC2IFP(sc)->if_lastchange);
 1035                 SC2IFP(sc)->if_opackets++;
 1036                 SC2IFP(sc)->if_obytes += len;
 1037                 carpstats.carps_opackets6++;
 1038 
 1039                 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) {
 1040                         SC2IFP(sc)->if_oerrors++;
 1041                         if (sc->sc_sendad_errors < INT_MAX)
 1042                                 sc->sc_sendad_errors++;
 1043                         if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
 1044                                 carp_suppress_preempt++;
 1045                                 if (carp_suppress_preempt == 1) {
 1046                                         CARP_SCUNLOCK(sc);
 1047                                         carp_send_ad_all();
 1048                                         CARP_SCLOCK(sc);
 1049                                 }
 1050                         }
 1051                         sc->sc_sendad_success = 0;
 1052                 } else {
 1053                         if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
 1054                                 if (++sc->sc_sendad_success >=
 1055                                     CARP_SENDAD_MIN_SUCCESS) {
 1056                                         carp_suppress_preempt--;
 1057                                         sc->sc_sendad_errors = 0;
 1058                                 }
 1059                         } else
 1060                                 sc->sc_sendad_errors = 0;
 1061                 }
 1062         }
 1063 #endif /* INET6 */
 1064 
 1065         if (advbase != 255 || advskew != 255)
 1066                 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
 1067                     carp_send_ad, sc);
 1068 
 1069 }
 1070 
 1071 /*
 1072  * Broadcast a gratuitous ARP request containing
 1073  * the virtual router MAC address for each IP address
 1074  * associated with the virtual router.
 1075  */
 1076 static void
 1077 carp_send_arp(struct carp_softc *sc)
 1078 {
 1079         struct ifaddr *ifa;
 1080 
 1081         TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
 1082 
 1083                 if (ifa->ifa_addr->sa_family != AF_INET)
 1084                         continue;
 1085 
 1086 /*              arprequest(sc->sc_carpdev, &in, &in, IF_LLADDR(sc->sc_ifp)); */
 1087                 arp_ifinit2(sc->sc_carpdev, ifa, IF_LLADDR(sc->sc_ifp));
 1088 
 1089                 DELAY(1000);    /* XXX */
 1090         }
 1091 }
 1092 
 1093 #ifdef INET6
 1094 static void
 1095 carp_send_na(struct carp_softc *sc)
 1096 {
 1097         struct ifaddr *ifa;
 1098         struct in6_addr *in6;
 1099         static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
 1100 
 1101         TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
 1102 
 1103                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1104                         continue;
 1105 
 1106                 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
 1107                 nd6_na_output(sc->sc_carpdev, &mcast, in6,
 1108                     ND_NA_FLAG_OVERRIDE, 1, NULL);
 1109                 DELAY(1000);    /* XXX */
 1110         }
 1111 }
 1112 #endif /* INET6 */
 1113 
 1114 static int
 1115 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type)
 1116 {
 1117         struct carp_softc *vh;
 1118         struct ifaddr *ifa;
 1119         int count = 0;
 1120 
 1121         CARP_LOCK_ASSERT(cif);
 1122 
 1123         TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
 1124                 if ((type == CARP_COUNT_RUNNING &&
 1125                     (SC2IFP(vh)->if_flags & IFF_UP) &&
 1126                     (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) ||
 1127                     (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) {
 1128                         TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist,
 1129                             ifa_list) {
 1130                                 if (ifa->ifa_addr->sa_family == AF_INET &&
 1131                                     ia->ia_addr.sin_addr.s_addr ==
 1132                                     ifatoia(ifa)->ia_addr.sin_addr.s_addr)
 1133                                         count++;
 1134                         }
 1135                 }
 1136         }
 1137         return (count);
 1138 }
 1139 
 1140 int
 1141 carp_iamatch(void *v, struct in_ifaddr *ia,
 1142     struct in_addr *isaddr, u_int8_t **enaddr)
 1143 {
 1144         struct carp_if *cif = v;
 1145         struct carp_softc *vh;
 1146         int index, count = 0;
 1147         struct ifaddr *ifa;
 1148 
 1149         CARP_LOCK(cif);
 1150 
 1151         if (carp_opts[CARPCTL_ARPBALANCE]) {
 1152                 /*
 1153                  * XXX proof of concept implementation.
 1154                  * We use the source ip to decide which virtual host should
 1155                  * handle the request. If we're master of that virtual host,
 1156                  * then we respond, otherwise, just drop the arp packet on
 1157                  * the floor.
 1158                  */
 1159                 count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING);
 1160                 if (count == 0) {
 1161                         /* should never reach this */
 1162                         CARP_UNLOCK(cif);
 1163                         return (0);
 1164                 }
 1165 
 1166                 /* this should be a hash, like pf_hash() */
 1167                 index = ntohl(isaddr->s_addr) % count;
 1168                 count = 0;
 1169 
 1170                 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
 1171                         if ((SC2IFP(vh)->if_flags & IFF_UP) &&
 1172                             (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) {
 1173                                 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist,
 1174                                     ifa_list) {
 1175                                         if (ifa->ifa_addr->sa_family ==
 1176                                             AF_INET &&
 1177                                             ia->ia_addr.sin_addr.s_addr ==
 1178                                             ifatoia(ifa)->ia_addr.sin_addr.s_addr) {
 1179                                                 if (count == index) {
 1180                                                         if (vh->sc_state ==
 1181                                                             MASTER) {
 1182                                                                 *enaddr = IF_LLADDR(vh->sc_ifp);
 1183                                                                 CARP_UNLOCK(cif);
 1184                                                                 return (1);
 1185                                                         } else {
 1186                                                                 CARP_UNLOCK(cif);
 1187                                                                 return (0);
 1188                                                         }
 1189                                                 }
 1190                                                 count++;
 1191                                         }
 1192                                 }
 1193                         }
 1194                 }
 1195         } else {
 1196                 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
 1197                         if ((SC2IFP(vh)->if_flags & IFF_UP) &&
 1198                             (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
 1199                             ia->ia_ifp == SC2IFP(vh) &&
 1200                             vh->sc_state == MASTER) {
 1201                                 *enaddr = IF_LLADDR(vh->sc_ifp);
 1202                                 CARP_UNLOCK(cif);
 1203                                 return (1);
 1204                         }
 1205                 }
 1206         }
 1207         CARP_UNLOCK(cif);
 1208         return (0);
 1209 }
 1210 
 1211 #ifdef INET6
 1212 struct ifaddr *
 1213 carp_iamatch6(void *v, struct in6_addr *taddr)
 1214 {
 1215         struct carp_if *cif = v;
 1216         struct carp_softc *vh;
 1217         struct ifaddr *ifa;
 1218 
 1219         CARP_LOCK(cif);
 1220         TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
 1221                 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, ifa_list) {
 1222                         if (IN6_ARE_ADDR_EQUAL(taddr,
 1223                             &ifatoia6(ifa)->ia_addr.sin6_addr) &&
 1224                             (SC2IFP(vh)->if_flags & IFF_UP) &&
 1225                             (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
 1226                             vh->sc_state == MASTER) {
 1227                                 CARP_UNLOCK(cif);
 1228                                 return (ifa);
 1229                         }
 1230                 }
 1231         }
 1232         CARP_UNLOCK(cif);
 1233         
 1234         return (NULL);
 1235 }
 1236 
 1237 void *
 1238 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr)
 1239 {
 1240         struct m_tag *mtag;
 1241         struct carp_if *cif = v;
 1242         struct carp_softc *sc;
 1243         struct ifaddr *ifa;
 1244 
 1245         CARP_LOCK(cif);
 1246         TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
 1247                 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
 1248                         if (IN6_ARE_ADDR_EQUAL(taddr,
 1249                             &ifatoia6(ifa)->ia_addr.sin6_addr) &&
 1250                             (SC2IFP(sc)->if_flags & IFF_UP) &&
 1251                             (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING)) {
 1252                                 struct ifnet *ifp = SC2IFP(sc);
 1253                                 mtag = m_tag_get(PACKET_TAG_CARP,
 1254                                     sizeof(struct ifnet *), M_NOWAIT);
 1255                                 if (mtag == NULL) {
 1256                                         /* better a bit than nothing */
 1257                                         CARP_UNLOCK(cif);
 1258                                         return (IF_LLADDR(sc->sc_ifp));
 1259                                 }
 1260                                 bcopy(&ifp, (caddr_t)(mtag + 1),
 1261                                     sizeof(struct ifnet *));
 1262                                 m_tag_prepend(m, mtag);
 1263 
 1264                                 CARP_UNLOCK(cif);
 1265                                 return (IF_LLADDR(sc->sc_ifp));
 1266                         }
 1267                 }
 1268         }
 1269         CARP_UNLOCK(cif);
 1270 
 1271         return (NULL);
 1272 }
 1273 #endif
 1274 
 1275 struct ifnet *
 1276 carp_forus(void *v, void *dhost)
 1277 {
 1278         struct carp_if *cif = v;
 1279         struct carp_softc *vh;
 1280         u_int8_t *ena = dhost;
 1281 
 1282         if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
 1283                 return (NULL);
 1284 
 1285         CARP_LOCK(cif);
 1286         TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list)
 1287                 if ((SC2IFP(vh)->if_flags & IFF_UP) &&
 1288                     (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
 1289                     vh->sc_state == MASTER &&
 1290                     !bcmp(dhost, IF_LLADDR(vh->sc_ifp), ETHER_ADDR_LEN)) {
 1291                         CARP_UNLOCK(cif);
 1292                         return (SC2IFP(vh));
 1293                 }
 1294 
 1295         CARP_UNLOCK(cif);
 1296         return (NULL);
 1297 }
 1298 
 1299 static void
 1300 carp_master_down(void *v)
 1301 {
 1302         struct carp_softc *sc = v;
 1303 
 1304         CARP_SCLOCK(sc);
 1305         carp_master_down_locked(sc);
 1306         CARP_SCUNLOCK(sc);
 1307 }
 1308 
 1309 static void
 1310 carp_master_down_locked(struct carp_softc *sc)
 1311 {
 1312         if (sc->sc_carpdev)
 1313                 CARP_SCLOCK_ASSERT(sc);
 1314 
 1315         switch (sc->sc_state) {
 1316         case INIT:
 1317                 printf("%s: master_down event in INIT state\n",
 1318                     SC2IFP(sc)->if_xname);
 1319                 break;
 1320         case MASTER:
 1321                 break;
 1322         case BACKUP:
 1323                 carp_set_state(sc, MASTER);
 1324                 carp_send_ad_locked(sc);
 1325                 carp_send_arp(sc);
 1326 #ifdef INET6
 1327                 carp_send_na(sc);
 1328 #endif /* INET6 */
 1329                 carp_setrun(sc, 0);
 1330                 carp_setroute(sc, RTM_ADD);
 1331                 break;
 1332         }
 1333 }
 1334 
 1335 /*
 1336  * When in backup state, af indicates whether to reset the master down timer
 1337  * for v4 or v6. If it's set to zero, reset the ones which are already pending.
 1338  */
 1339 static void
 1340 carp_setrun(struct carp_softc *sc, sa_family_t af)
 1341 {
 1342         struct timeval tv;
 1343 
 1344         if (sc->sc_carpdev == NULL) {
 1345                 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
 1346                 carp_set_state(sc, INIT);
 1347                 return;
 1348         } else
 1349                 CARP_SCLOCK_ASSERT(sc);
 1350 
 1351         if (SC2IFP(sc)->if_flags & IFF_UP &&
 1352             sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6) &&
 1353             sc->sc_carpdev->if_link_state == LINK_STATE_UP)
 1354                 SC2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING;
 1355         else {
 1356                 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
 1357                 carp_setroute(sc, RTM_DELETE);
 1358                 return;
 1359         }
 1360 
 1361         switch (sc->sc_state) {
 1362         case INIT:
 1363                 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) {
 1364                         carp_send_ad_locked(sc);
 1365                         carp_send_arp(sc);
 1366 #ifdef INET6
 1367                         carp_send_na(sc);
 1368 #endif /* INET6 */
 1369                         CARP_DEBUG("%s: INIT -> MASTER (preempting)\n",
 1370                             SC2IFP(sc)->if_xname);
 1371                         carp_set_state(sc, MASTER);
 1372                         carp_setroute(sc, RTM_ADD);
 1373                 } else {
 1374                         CARP_DEBUG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname);
 1375                         carp_set_state(sc, BACKUP);
 1376                         carp_setroute(sc, RTM_DELETE);
 1377                         carp_setrun(sc, 0);
 1378                 }
 1379                 break;
 1380         case BACKUP:
 1381                 callout_stop(&sc->sc_ad_tmo);
 1382                 tv.tv_sec = 3 * sc->sc_advbase;
 1383                 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
 1384                 switch (af) {
 1385 #ifdef INET
 1386                 case AF_INET:
 1387                         callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
 1388                             carp_master_down, sc);
 1389                         break;
 1390 #endif /* INET */
 1391 #ifdef INET6
 1392                 case AF_INET6:
 1393                         callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
 1394                             carp_master_down, sc);
 1395                         break;
 1396 #endif /* INET6 */
 1397                 default:
 1398                         if (sc->sc_naddrs)
 1399                                 callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
 1400                                     carp_master_down, sc);
 1401                         if (sc->sc_naddrs6)
 1402                                 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
 1403                                     carp_master_down, sc);
 1404                         break;
 1405                 }
 1406                 break;
 1407         case MASTER:
 1408                 tv.tv_sec = sc->sc_advbase;
 1409                 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
 1410                 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
 1411                     carp_send_ad, sc);
 1412                 break;
 1413         }
 1414 }
 1415 
 1416 static void
 1417 carp_multicast_cleanup(struct carp_softc *sc)
 1418 {
 1419         struct ip_moptions *imo = &sc->sc_imo;
 1420         u_int16_t n = imo->imo_num_memberships;
 1421 
 1422         /* Clean up our own multicast memberships */
 1423         while (n-- > 0) {
 1424                 if (imo->imo_membership[n] != NULL) {
 1425                         in_delmulti(imo->imo_membership[n]);
 1426                         imo->imo_membership[n] = NULL;
 1427                 }
 1428         }
 1429         KASSERT(imo->imo_mfilters == NULL,
 1430            ("%s: imo_mfilters != NULL", __func__));
 1431         imo->imo_num_memberships = 0;
 1432         imo->imo_multicast_ifp = NULL;
 1433 }
 1434 
 1435 #ifdef INET6
 1436 static void
 1437 carp_multicast6_cleanup(struct carp_softc *sc)
 1438 {
 1439         struct ip6_moptions *im6o = &sc->sc_im6o;
 1440 
 1441         while (!LIST_EMPTY(&im6o->im6o_memberships)) {
 1442                 struct in6_multi_mship *imm =
 1443                     LIST_FIRST(&im6o->im6o_memberships);
 1444 
 1445                 LIST_REMOVE(imm, i6mm_chain);
 1446                 in6_leavegroup(imm);
 1447         }
 1448         im6o->im6o_multicast_ifp = NULL;
 1449 }
 1450 #endif
 1451 
 1452 static int
 1453 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin)
 1454 {
 1455         struct ifnet *ifp;
 1456         struct carp_if *cif;
 1457         struct in_ifaddr *ia, *ia_if;
 1458         struct ip_moptions *imo = &sc->sc_imo;
 1459         struct in_addr addr;
 1460         u_long iaddr = htonl(sin->sin_addr.s_addr);
 1461         int own, error;
 1462 
 1463         if (sin->sin_addr.s_addr == 0) {
 1464                 if (!(SC2IFP(sc)->if_flags & IFF_UP))
 1465                         carp_set_state(sc, INIT);
 1466                 if (sc->sc_naddrs)
 1467                         SC2IFP(sc)->if_flags |= IFF_UP;
 1468                 if (sc->sc_carpdev)
 1469                         CARP_SCLOCK(sc);
 1470                 carp_setrun(sc, 0);
 1471                 if (sc->sc_carpdev)
 1472                         CARP_SCUNLOCK(sc);
 1473                 return (0);
 1474         }
 1475 
 1476         /* we have to do it by hands to check we won't match on us */
 1477         ia_if = NULL; own = 0;
 1478         TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
 1479                 /* and, yeah, we need a multicast-capable iface too */
 1480                 if (ia->ia_ifp != SC2IFP(sc) &&
 1481                     (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
 1482                     (iaddr & ia->ia_subnetmask) == ia->ia_subnet) {
 1483                         if (!ia_if)
 1484                                 ia_if = ia;
 1485                         if (sin->sin_addr.s_addr ==
 1486                             ia->ia_addr.sin_addr.s_addr)
 1487                                 own++;
 1488                 }
 1489         }
 1490 
 1491         if (!ia_if)
 1492                 return (EADDRNOTAVAIL);
 1493 
 1494         ia = ia_if;
 1495         ifp = ia->ia_ifp;
 1496 
 1497         if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
 1498             (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp))
 1499                 return (EADDRNOTAVAIL);
 1500 
 1501         if (imo->imo_num_memberships == 0) {
 1502                 addr.s_addr = htonl(INADDR_CARP_GROUP);
 1503                 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL)
 1504                         return (ENOBUFS);
 1505                 imo->imo_num_memberships++;
 1506                 imo->imo_multicast_ifp = ifp;
 1507                 imo->imo_multicast_ttl = CARP_DFLTTL;
 1508                 imo->imo_multicast_loop = 0;
 1509         }
 1510 
 1511         if (!ifp->if_carp) {
 1512 
 1513                 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP,
 1514                     M_WAITOK|M_ZERO);
 1515                 if (!cif) {
 1516                         error = ENOBUFS;
 1517                         goto cleanup;
 1518                 }
 1519                 if ((error = ifpromisc(ifp, 1))) {
 1520                         FREE(cif, M_CARP);
 1521                         goto cleanup;
 1522                 }
 1523                 
 1524                 CARP_LOCK_INIT(cif);
 1525                 CARP_LOCK(cif);
 1526                 cif->vhif_ifp = ifp;
 1527                 TAILQ_INIT(&cif->vhif_vrs);
 1528                 ifp->if_carp = cif;
 1529 
 1530         } else {
 1531                 struct carp_softc *vr;
 1532 
 1533                 cif = (struct carp_if *)ifp->if_carp;
 1534                 CARP_LOCK(cif);
 1535                 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
 1536                         if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
 1537                                 CARP_UNLOCK(cif);
 1538                                 error = EEXIST;
 1539                                 goto cleanup;
 1540                         }
 1541         }
 1542         sc->sc_ia = ia;
 1543         sc->sc_carpdev = ifp;
 1544 
 1545         { /* XXX prevent endless loop if already in queue */
 1546         struct carp_softc *vr, *after = NULL;
 1547         int myself = 0;
 1548         cif = (struct carp_if *)ifp->if_carp;
 1549 
 1550         /* XXX: cif should not change, right? So we still hold the lock */
 1551         CARP_LOCK_ASSERT(cif);
 1552 
 1553         TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
 1554                 if (vr == sc)
 1555                         myself = 1;
 1556                 if (vr->sc_vhid < sc->sc_vhid)
 1557                         after = vr;
 1558         }
 1559 
 1560         if (!myself) {
 1561                 /* We're trying to keep things in order */
 1562                 if (after == NULL) {
 1563                         TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
 1564                 } else {
 1565                         TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
 1566                 }
 1567                 cif->vhif_nvrs++;
 1568         }
 1569         }
 1570 
 1571         sc->sc_naddrs++;
 1572         SC2IFP(sc)->if_flags |= IFF_UP;
 1573         if (own)
 1574                 sc->sc_advskew = 0;
 1575         carp_sc_state_locked(sc);
 1576         carp_setrun(sc, 0);
 1577 
 1578         CARP_UNLOCK(cif);
 1579 
 1580         return (0);
 1581 
 1582 cleanup:
 1583         in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
 1584         return (error);
 1585 }
 1586 
 1587 static int
 1588 carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin)
 1589 {
 1590         int error = 0;
 1591 
 1592         if (!--sc->sc_naddrs) {
 1593                 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
 1594                 struct ip_moptions *imo = &sc->sc_imo;
 1595 
 1596                 CARP_LOCK(cif);
 1597                 callout_stop(&sc->sc_ad_tmo);
 1598                 SC2IFP(sc)->if_flags &= ~IFF_UP;
 1599                 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
 1600                 sc->sc_vhid = -1;
 1601                 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
 1602                 imo->imo_multicast_ifp = NULL;
 1603                 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
 1604                 if (!--cif->vhif_nvrs) {
 1605                         sc->sc_carpdev->if_carp = NULL;
 1606                         CARP_LOCK_DESTROY(cif);
 1607                         FREE(cif, M_IFADDR);
 1608                 } else {
 1609                         CARP_UNLOCK(cif);
 1610                 }
 1611         }
 1612 
 1613         return (error);
 1614 }
 1615 
 1616 #ifdef INET6
 1617 static int
 1618 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
 1619 {
 1620         struct ifnet *ifp;
 1621         struct carp_if *cif;
 1622         struct in6_ifaddr *ia, *ia_if;
 1623         struct ip6_moptions *im6o = &sc->sc_im6o;
 1624         struct in6_multi_mship *imm;
 1625         struct in6_addr in6;
 1626         int own, error;
 1627 
 1628         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 1629                 if (!(SC2IFP(sc)->if_flags & IFF_UP))
 1630                         carp_set_state(sc, INIT);
 1631                 if (sc->sc_naddrs6)
 1632                         SC2IFP(sc)->if_flags |= IFF_UP;
 1633                 if (sc->sc_carpdev)
 1634                         CARP_SCLOCK(sc);
 1635                 carp_setrun(sc, 0);
 1636                 if (sc->sc_carpdev)
 1637                         CARP_SCUNLOCK(sc);
 1638                 return (0);
 1639         }
 1640 
 1641         /* we have to do it by hands to check we won't match on us */
 1642         ia_if = NULL; own = 0;
 1643         for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
 1644                 int i;
 1645 
 1646                 for (i = 0; i < 4; i++) {
 1647                         if ((sin6->sin6_addr.s6_addr32[i] &
 1648                             ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
 1649                             (ia->ia_addr.sin6_addr.s6_addr32[i] &
 1650                             ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
 1651                                 break;
 1652                 }
 1653                 /* and, yeah, we need a multicast-capable iface too */
 1654                 if (ia->ia_ifp != SC2IFP(sc) &&
 1655                     (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
 1656                     (i == 4)) {
 1657                         if (!ia_if)
 1658                                 ia_if = ia;
 1659                         if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
 1660                             &ia->ia_addr.sin6_addr))
 1661                                 own++;
 1662                 }
 1663         }
 1664 
 1665         if (!ia_if)
 1666                 return (EADDRNOTAVAIL);
 1667         ia = ia_if;
 1668         ifp = ia->ia_ifp;
 1669 
 1670         if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
 1671             (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp))
 1672                 return (EADDRNOTAVAIL);
 1673 
 1674         if (!sc->sc_naddrs6) {
 1675                 im6o->im6o_multicast_ifp = ifp;
 1676 
 1677                 /* join CARP multicast address */
 1678                 bzero(&in6, sizeof(in6));
 1679                 in6.s6_addr16[0] = htons(0xff02);
 1680                 in6.s6_addr8[15] = 0x12;
 1681                 if (in6_setscope(&in6, ifp, NULL) != 0)
 1682                         goto cleanup;
 1683                 if ((imm = in6_joingroup(ifp, &in6, &error, 0)) == NULL)
 1684                         goto cleanup;
 1685                 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
 1686 
 1687                 /* join solicited multicast address */
 1688                 bzero(&in6, sizeof(in6));
 1689                 in6.s6_addr16[0] = htons(0xff02);
 1690                 in6.s6_addr32[1] = 0;
 1691                 in6.s6_addr32[2] = htonl(1);
 1692                 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3];
 1693                 in6.s6_addr8[12] = 0xff;
 1694                 if (in6_setscope(&in6, ifp, NULL) != 0)
 1695                         goto cleanup;
 1696                 if ((imm = in6_joingroup(ifp, &in6, &error, 0)) == NULL)
 1697                         goto cleanup;
 1698                 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
 1699         }
 1700 
 1701         if (!ifp->if_carp) {
 1702                 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP,
 1703                     M_WAITOK|M_ZERO);
 1704                 if (!cif) {
 1705                         error = ENOBUFS;
 1706                         goto cleanup;
 1707                 }
 1708                 if ((error = ifpromisc(ifp, 1))) {
 1709                         FREE(cif, M_CARP);
 1710                         goto cleanup;
 1711                 }
 1712 
 1713                 CARP_LOCK_INIT(cif);
 1714                 CARP_LOCK(cif);
 1715                 cif->vhif_ifp = ifp;
 1716                 TAILQ_INIT(&cif->vhif_vrs);
 1717                 ifp->if_carp = cif;
 1718 
 1719         } else {
 1720                 struct carp_softc *vr;
 1721 
 1722                 cif = (struct carp_if *)ifp->if_carp;
 1723                 CARP_LOCK(cif);
 1724                 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
 1725                         if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
 1726                                 CARP_UNLOCK(cif);
 1727                                 error = EINVAL;
 1728                                 goto cleanup;
 1729                         }
 1730         }
 1731         sc->sc_ia6 = ia;
 1732         sc->sc_carpdev = ifp;
 1733 
 1734         { /* XXX prevent endless loop if already in queue */
 1735         struct carp_softc *vr, *after = NULL;
 1736         int myself = 0;
 1737         cif = (struct carp_if *)ifp->if_carp;
 1738         CARP_LOCK_ASSERT(cif);
 1739 
 1740         TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
 1741                 if (vr == sc)
 1742                         myself = 1;
 1743                 if (vr->sc_vhid < sc->sc_vhid)
 1744                         after = vr;
 1745         }
 1746 
 1747         if (!myself) {
 1748                 /* We're trying to keep things in order */
 1749                 if (after == NULL) {
 1750                         TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
 1751                 } else {
 1752                         TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
 1753                 }
 1754                 cif->vhif_nvrs++;
 1755         }
 1756         }
 1757 
 1758         sc->sc_naddrs6++;
 1759         SC2IFP(sc)->if_flags |= IFF_UP;
 1760         if (own)
 1761                 sc->sc_advskew = 0;
 1762         carp_sc_state_locked(sc);
 1763         carp_setrun(sc, 0);
 1764 
 1765         CARP_UNLOCK(cif);
 1766 
 1767         return (0);
 1768 
 1769 cleanup:
 1770         /* clean up multicast memberships */
 1771         if (!sc->sc_naddrs6) {
 1772                 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
 1773                         imm = LIST_FIRST(&im6o->im6o_memberships);
 1774                         LIST_REMOVE(imm, i6mm_chain);
 1775                         in6_leavegroup(imm);
 1776                 }
 1777         }
 1778         return (error);
 1779 }
 1780 
 1781 static int
 1782 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
 1783 {
 1784         int error = 0;
 1785 
 1786         if (!--sc->sc_naddrs6) {
 1787                 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
 1788                 struct ip6_moptions *im6o = &sc->sc_im6o;
 1789 
 1790                 CARP_LOCK(cif);
 1791                 callout_stop(&sc->sc_ad_tmo);
 1792                 SC2IFP(sc)->if_flags &= ~IFF_UP;
 1793                 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
 1794                 sc->sc_vhid = -1;
 1795                 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
 1796                         struct in6_multi_mship *imm =
 1797                             LIST_FIRST(&im6o->im6o_memberships);
 1798 
 1799                         LIST_REMOVE(imm, i6mm_chain);
 1800                         in6_leavegroup(imm);
 1801                 }
 1802                 im6o->im6o_multicast_ifp = NULL;
 1803                 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
 1804                 if (!--cif->vhif_nvrs) {
 1805                         CARP_LOCK_DESTROY(cif);
 1806                         sc->sc_carpdev->if_carp = NULL;
 1807                         FREE(cif, M_IFADDR);
 1808                 } else
 1809                         CARP_UNLOCK(cif);
 1810         }
 1811 
 1812         return (error);
 1813 }
 1814 #endif /* INET6 */
 1815 
 1816 static int
 1817 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr)
 1818 {
 1819         struct carp_softc *sc = ifp->if_softc, *vr;
 1820         struct carpreq carpr;
 1821         struct ifaddr *ifa;
 1822         struct ifreq *ifr;
 1823         struct ifaliasreq *ifra;
 1824         int locked = 0, error = 0;
 1825 
 1826         ifa = (struct ifaddr *)addr;
 1827         ifra = (struct ifaliasreq *)addr;
 1828         ifr = (struct ifreq *)addr;
 1829 
 1830         switch (cmd) {
 1831         case SIOCSIFADDR:
 1832                 switch (ifa->ifa_addr->sa_family) {
 1833 #ifdef INET
 1834                 case AF_INET:
 1835                         SC2IFP(sc)->if_flags |= IFF_UP;
 1836                         bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
 1837                             sizeof(struct sockaddr));
 1838                         error = carp_set_addr(sc, satosin(ifa->ifa_addr));
 1839                         break;
 1840 #endif /* INET */
 1841 #ifdef INET6
 1842                 case AF_INET6:
 1843                         SC2IFP(sc)->if_flags |= IFF_UP;
 1844                         error = carp_set_addr6(sc, satosin6(ifa->ifa_addr));
 1845                         break;
 1846 #endif /* INET6 */
 1847                 default:
 1848                         error = EAFNOSUPPORT;
 1849                         break;
 1850                 }
 1851                 break;
 1852 
 1853         case SIOCAIFADDR:
 1854                 switch (ifa->ifa_addr->sa_family) {
 1855 #ifdef INET
 1856                 case AF_INET:
 1857                         SC2IFP(sc)->if_flags |= IFF_UP;
 1858                         bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
 1859                             sizeof(struct sockaddr));
 1860                         error = carp_set_addr(sc, satosin(&ifra->ifra_addr));
 1861                         break;
 1862 #endif /* INET */
 1863 #ifdef INET6
 1864                 case AF_INET6:
 1865                         SC2IFP(sc)->if_flags |= IFF_UP;
 1866                         error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr));
 1867                         break;
 1868 #endif /* INET6 */
 1869                 default:
 1870                         error = EAFNOSUPPORT;
 1871                         break;
 1872                 }
 1873                 break;
 1874 
 1875         case SIOCDIFADDR:
 1876                 switch (ifa->ifa_addr->sa_family) {
 1877 #ifdef INET
 1878                 case AF_INET:
 1879                         error = carp_del_addr(sc, satosin(&ifra->ifra_addr));
 1880                         break;
 1881 #endif /* INET */
 1882 #ifdef INET6
 1883                 case AF_INET6:
 1884                         error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr));
 1885                         break;
 1886 #endif /* INET6 */
 1887                 default:
 1888                         error = EAFNOSUPPORT;
 1889                         break;
 1890                 }
 1891                 break;
 1892 
 1893         case SIOCSIFFLAGS:
 1894                 if (sc->sc_carpdev) {
 1895                         locked = 1;
 1896                         CARP_SCLOCK(sc);
 1897                 }
 1898                 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) {
 1899                         callout_stop(&sc->sc_ad_tmo);
 1900                         callout_stop(&sc->sc_md_tmo);
 1901                         callout_stop(&sc->sc_md6_tmo);
 1902                         if (sc->sc_state == MASTER)
 1903                                 carp_send_ad_locked(sc);
 1904                         carp_set_state(sc, INIT);
 1905                         carp_setrun(sc, 0);
 1906                 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) {
 1907                         SC2IFP(sc)->if_flags |= IFF_UP;
 1908                         carp_setrun(sc, 0);
 1909                 }
 1910                 break;
 1911 
 1912         case SIOCSVH:
 1913                 error = priv_check(curthread, PRIV_NETINET_CARP);
 1914                 if (error)
 1915                         break;
 1916                 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr)))
 1917                         break;
 1918                 error = 1;
 1919                 if (sc->sc_carpdev) {
 1920                         locked = 1;
 1921                         CARP_SCLOCK(sc);
 1922                 }
 1923                 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) {
 1924                         switch (carpr.carpr_state) {
 1925                         case BACKUP:
 1926                                 callout_stop(&sc->sc_ad_tmo);
 1927                                 carp_set_state(sc, BACKUP);
 1928                                 carp_setrun(sc, 0);
 1929                                 carp_setroute(sc, RTM_DELETE);
 1930                                 break;
 1931                         case MASTER:
 1932                                 carp_master_down_locked(sc);
 1933                                 break;
 1934                         default:
 1935                                 break;
 1936                         }
 1937                 }
 1938                 if (carpr.carpr_vhid > 0) {
 1939                         if (carpr.carpr_vhid > 255) {
 1940                                 error = EINVAL;
 1941                                 break;
 1942                         }
 1943                         if (sc->sc_carpdev) {
 1944                                 struct carp_if *cif;
 1945                                 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
 1946                                 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
 1947                                         if (vr != sc &&
 1948                                             vr->sc_vhid == carpr.carpr_vhid) {
 1949                                                 error = EEXIST;
 1950                                                 break;
 1951                                         }
 1952                                 if (error == EEXIST)
 1953                                         break;
 1954                         }
 1955                         sc->sc_vhid = carpr.carpr_vhid;
 1956                         IF_LLADDR(sc->sc_ifp)[0] = 0;
 1957                         IF_LLADDR(sc->sc_ifp)[1] = 0;
 1958                         IF_LLADDR(sc->sc_ifp)[2] = 0x5e;
 1959                         IF_LLADDR(sc->sc_ifp)[3] = 0;
 1960                         IF_LLADDR(sc->sc_ifp)[4] = 1;
 1961                         IF_LLADDR(sc->sc_ifp)[5] = sc->sc_vhid;
 1962                         error--;
 1963                 }
 1964                 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) {
 1965                         if (carpr.carpr_advskew >= 255) {
 1966                                 error = EINVAL;
 1967                                 break;
 1968                         }
 1969                         if (carpr.carpr_advbase > 255) {
 1970                                 error = EINVAL;
 1971                                 break;
 1972                         }
 1973                         sc->sc_advbase = carpr.carpr_advbase;
 1974                         sc->sc_advskew = carpr.carpr_advskew;
 1975                         error--;
 1976                 }
 1977                 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key));
 1978                 if (error > 0)
 1979                         error = EINVAL;
 1980                 else {
 1981                         error = 0;
 1982                         carp_setrun(sc, 0);
 1983                 }
 1984                 break;
 1985 
 1986         case SIOCGVH:
 1987                 /* XXX: lockless read */
 1988                 bzero(&carpr, sizeof(carpr));
 1989                 carpr.carpr_state = sc->sc_state;
 1990                 carpr.carpr_vhid = sc->sc_vhid;
 1991                 carpr.carpr_advbase = sc->sc_advbase;
 1992                 carpr.carpr_advskew = sc->sc_advskew;
 1993                 error = priv_check(curthread, PRIV_NETINET_CARP);
 1994                 if (error == 0)
 1995                         bcopy(sc->sc_key, carpr.carpr_key,
 1996                             sizeof(carpr.carpr_key));
 1997                 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
 1998                 break;
 1999 
 2000         default:
 2001                 error = EINVAL;
 2002         }
 2003 
 2004         if (locked)
 2005                 CARP_SCUNLOCK(sc);
 2006 
 2007         carp_hmac_prepare(sc);
 2008 
 2009         return (error);
 2010 }
 2011 
 2012 /*
 2013  * XXX: this is looutput. We should eventually use it from there.
 2014  */
 2015 static int
 2016 carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
 2017     struct rtentry *rt)
 2018 {
 2019         u_int32_t af;
 2020 
 2021         M_ASSERTPKTHDR(m); /* check if we have the packet header */
 2022 
 2023         if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
 2024                 m_freem(m);
 2025                 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
 2026                         rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
 2027         }
 2028 
 2029         ifp->if_opackets++;
 2030         ifp->if_obytes += m->m_pkthdr.len;
 2031 
 2032         /* BPF writes need to be handled specially. */
 2033         if (dst->sa_family == AF_UNSPEC) {
 2034                 bcopy(dst->sa_data, &af, sizeof(af));
 2035                 dst->sa_family = af;
 2036         }
 2037 
 2038 #if 1   /* XXX */
 2039         switch (dst->sa_family) {
 2040         case AF_INET:
 2041         case AF_INET6:
 2042         case AF_IPX:
 2043         case AF_APPLETALK:
 2044                 break;
 2045         default:
 2046                 printf("carp_looutput: af=%d unexpected\n", dst->sa_family);
 2047                 m_freem(m);
 2048                 return (EAFNOSUPPORT);
 2049         }
 2050 #endif
 2051         return(if_simloop(ifp, m, dst->sa_family, 0));
 2052 }
 2053 
 2054 /*
 2055  * Start output on carp interface. This function should never be called.
 2056  */
 2057 static void
 2058 carp_start(struct ifnet *ifp)
 2059 {
 2060 #ifdef DEBUG
 2061         printf("%s: start called\n", ifp->if_xname);
 2062 #endif
 2063 }
 2064 
 2065 int
 2066 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
 2067     struct rtentry *rt)
 2068 {
 2069         struct m_tag *mtag;
 2070         struct carp_softc *sc;
 2071         struct ifnet *carp_ifp;
 2072 
 2073         if (!sa)
 2074                 return (0);
 2075 
 2076         switch (sa->sa_family) {
 2077 #ifdef INET
 2078         case AF_INET:
 2079                 break;
 2080 #endif /* INET */
 2081 #ifdef INET6
 2082         case AF_INET6:
 2083                 break;
 2084 #endif /* INET6 */
 2085         default:
 2086                 return (0);
 2087         }
 2088 
 2089         mtag = m_tag_find(m, PACKET_TAG_CARP, NULL);
 2090         if (mtag == NULL)
 2091                 return (0);
 2092 
 2093         bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *));
 2094         sc = carp_ifp->if_softc;
 2095 
 2096         /* Set the source MAC address to Virtual Router MAC Address */
 2097         switch (ifp->if_type) {
 2098         case IFT_ETHER:
 2099         case IFT_L2VLAN: {
 2100                         struct ether_header *eh;
 2101 
 2102                         eh = mtod(m, struct ether_header *);
 2103                         eh->ether_shost[0] = 0;
 2104                         eh->ether_shost[1] = 0;
 2105                         eh->ether_shost[2] = 0x5e;
 2106                         eh->ether_shost[3] = 0;
 2107                         eh->ether_shost[4] = 1;
 2108                         eh->ether_shost[5] = sc->sc_vhid;
 2109                 }
 2110                 break;
 2111         case IFT_FDDI: {
 2112                         struct fddi_header *fh;
 2113 
 2114                         fh = mtod(m, struct fddi_header *);
 2115                         fh->fddi_shost[0] = 0;
 2116                         fh->fddi_shost[1] = 0;
 2117                         fh->fddi_shost[2] = 0x5e;
 2118                         fh->fddi_shost[3] = 0;
 2119                         fh->fddi_shost[4] = 1;
 2120                         fh->fddi_shost[5] = sc->sc_vhid;
 2121                 }
 2122                 break;
 2123         case IFT_ISO88025: {
 2124                         struct iso88025_header *th;
 2125                         th = mtod(m, struct iso88025_header *);
 2126                         th->iso88025_shost[0] = 3;
 2127                         th->iso88025_shost[1] = 0;
 2128                         th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1);
 2129                         th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1);
 2130                         th->iso88025_shost[4] = 0;
 2131                         th->iso88025_shost[5] = 0;
 2132                 }
 2133                 break;
 2134         default:
 2135                 printf("%s: carp is not supported for this interface type\n",
 2136                     ifp->if_xname);
 2137                 return (EOPNOTSUPP);
 2138         }
 2139 
 2140         return (0);
 2141 }
 2142 
 2143 static void
 2144 carp_set_state(struct carp_softc *sc, int state)
 2145 {
 2146 
 2147         if (sc->sc_carpdev)
 2148                 CARP_SCLOCK_ASSERT(sc);
 2149 
 2150         if (sc->sc_state == state)
 2151                 return;
 2152 
 2153         sc->sc_state = state;
 2154         switch (state) {
 2155         case BACKUP:
 2156                 SC2IFP(sc)->if_link_state = LINK_STATE_DOWN;
 2157                 break;
 2158         case MASTER:
 2159                 SC2IFP(sc)->if_link_state = LINK_STATE_UP;
 2160                 break;
 2161         default:
 2162                 SC2IFP(sc)->if_link_state = LINK_STATE_UNKNOWN;
 2163                 break;
 2164         }
 2165         rt_ifmsg(SC2IFP(sc));
 2166 }
 2167 
 2168 void
 2169 carp_carpdev_state(void *v)
 2170 {
 2171         struct carp_if *cif = v;
 2172 
 2173         CARP_LOCK(cif);
 2174         carp_carpdev_state_locked(cif);
 2175         CARP_UNLOCK(cif);
 2176 }
 2177 
 2178 static void
 2179 carp_carpdev_state_locked(struct carp_if *cif)
 2180 {
 2181         struct carp_softc *sc;
 2182 
 2183         TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
 2184                 carp_sc_state_locked(sc);
 2185 }
 2186 
 2187 static void
 2188 carp_sc_state_locked(struct carp_softc *sc)
 2189 {
 2190         CARP_SCLOCK_ASSERT(sc);
 2191 
 2192         if (sc->sc_carpdev->if_link_state != LINK_STATE_UP ||
 2193             !(sc->sc_carpdev->if_flags & IFF_UP)) {
 2194                 sc->sc_flags_backup = SC2IFP(sc)->if_flags;
 2195                 SC2IFP(sc)->if_flags &= ~IFF_UP;
 2196                 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
 2197                 callout_stop(&sc->sc_ad_tmo);
 2198                 callout_stop(&sc->sc_md_tmo);
 2199                 callout_stop(&sc->sc_md6_tmo);
 2200                 carp_set_state(sc, INIT);
 2201                 carp_setrun(sc, 0);
 2202                 if (!sc->sc_suppress) {
 2203                         carp_suppress_preempt++;
 2204                         if (carp_suppress_preempt == 1) {
 2205                                 CARP_SCUNLOCK(sc);
 2206                                 carp_send_ad_all();
 2207                                 CARP_SCLOCK(sc);
 2208                         }
 2209                 }
 2210                 sc->sc_suppress = 1;
 2211         } else {
 2212                 SC2IFP(sc)->if_flags |= sc->sc_flags_backup;
 2213                 carp_set_state(sc, INIT);
 2214                 carp_setrun(sc, 0);
 2215                 if (sc->sc_suppress)
 2216                         carp_suppress_preempt--;
 2217                 sc->sc_suppress = 0;
 2218         }
 2219 
 2220         return;
 2221 }
 2222 
 2223 static int
 2224 carp_modevent(module_t mod, int type, void *data)
 2225 {
 2226         switch (type) {
 2227         case MOD_LOAD:
 2228                 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
 2229                     carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY);
 2230                 if (if_detach_event_tag == NULL)
 2231                         return (ENOMEM);
 2232                 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF);
 2233                 LIST_INIT(&carpif_list);
 2234                 if_clone_attach(&carp_cloner);
 2235                 break;
 2236 
 2237         case MOD_UNLOAD:
 2238                 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag);
 2239                 if_clone_detach(&carp_cloner);
 2240                 mtx_destroy(&carp_mtx);
 2241                 break;
 2242 
 2243         default:
 2244                 return (EINVAL);
 2245         }
 2246 
 2247         return (0);
 2248 }
 2249 
 2250 static moduledata_t carp_mod = {
 2251         "carp",
 2252         carp_modevent,
 2253         0
 2254 };
 2255 
 2256 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);

Cache object: e850530c87c1018fa18e346b67d278d0


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