sys/netinet/ip_carp.c

   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  * $FreeBSD: src/sys/netinet/ip_carp.c,v 1.48 2007/02/02 09:39:09 glebius Exp $
  28  */
  29
  30 #include "opt_carp.h"
  31 #include "opt_inet.h"
  32 #include "opt_inet6.h"
  33
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #include <sys/in_cksum.h>
  38 #include <sys/limits.h>
  39 #include <sys/malloc.h>
  40 #include <sys/mbuf.h>
  41 #include <sys/msgport2.h>
  42 #include <sys/time.h>
  43 #include <sys/proc.h>
  44 #include <sys/priv.h>
  45 #include <sys/sockio.h>
  46 #include <sys/socket.h>
  47 #include <sys/sysctl.h>
  48 #include <sys/syslog.h>
  49 #include <sys/thread.h>
  50
  51 #include <machine/stdarg.h>
  52 #include <crypto/sha1.h>
  53
  54 #include <net/bpf.h>
  55 #include <net/ethernet.h>
  56 #include <net/if.h>
  57 #include <net/if_dl.h>
  58 #include <net/if_types.h>
  59 #include <net/route.h>
  60 #include <net/if_clone.h>
  61 #include <net/if_var.h>
  62 #include <net/ifq_var.h>
  63 #include <net/netmsg2.h>
  64 #include <net/netisr2.h>
  65
  66 #ifdef INET
  67 #include <netinet/in.h>
  68 #include <netinet/in_var.h>
  69 #include <netinet/in_systm.h>
  70 #include <netinet/ip.h>
  71 #include <netinet/ip_var.h>
  72 #include <netinet/if_ether.h>
  73 #endif
  74
  75 #ifdef INET6
  76 #include <netinet/icmp6.h>
  77 #include <netinet/ip6.h>
  78 #include <netinet6/ip6_var.h>
  79 #include <netinet6/scope6_var.h>
  80 #include <netinet6/nd6.h>
  81 #endif
  82
  83 #include <netinet/ip_carp.h>
  84
  85 /*
  86  * Note about carp's MP safe approach:
  87  *
  88  * Brief: carp_softc (softc), carp_softc_container (scc)
  89  *
  90  * - All configuration operation, e.g. ioctl, add/delete inet addresses
  91  *   is serialized by netisr0; not by carp's serializer
  92  *
  93  * - Backing interface's if_carp and carp_softc's relationship:
  94  *
  95  *                +---------+
  96  *     if_carp -->| carp_if |
  97  *                +---------+
  98  *                     |
  99  *                     |
 100  *                     V      +---------+
 101  *                  +-----+   |         |
 102  *                  | scc |-->|  softc  |
 103  *                  +-----+   |         |
 104  *                     |      +---------+
 105  *                     |
 106  *                     V      +---------+
 107  *                  +-----+   |         |
 108  *                  | scc |-->|  softc  |
 109  *                  +-----+   |         |
 110  *                            +---------+
 111  *
 112  * - if_carp creation, modification and deletion all happen in netisr0,
 113  *   as stated previously.  Since if_carp is accessed by multiple netisrs,
 114  *   the modification to if_carp is conducted in the following way:
 115  *
 116  *   Adding carp_softc:
 117  *
 118  *   1) Duplicate the old carp_if to new carp_if (ncif), and insert the
 119  *      to-be-added carp_softc to the new carp_if (ncif):
 120  *
 121  *        if_carp                     ncif
 122  *           |                         |
 123  *           V                         V
 124  *      +---------+               +---------+
 125  *      | carp_if |               | carp_if |
 126  *      +---------+               +---------+
 127  *           |                         |
 128  *           |                         |
 129  *           V        +-------+        V
 130  *        +-----+     |       |     +-----+
 131  *        | scc |---->| softc |<----| scc |
 132  *        +-----+     |       |     +-----+
 133  *           |        +-------+        |
 134  *           |                         |
 135  *           V        +-------+        V
 136  *        +-----+     |       |     +-----+
 137  *        | scc |---->| softc |<----| scc |
 138  *        +-----+     |       |     +-----+
 139  *                    +-------+        |
 140  *                                     |
 141  *                    +-------+        V
 142  *                    |       |     +-----+
 143  *                    | softc |<----| scc |
 144  *                    |       |     +-----+
 145  *                    +-------+
 146  *
 147  *   2) Switch save if_carp into ocif and switch if_carp to ncif:
 148  *
 149  *          ocif                    if_carp
 150  *           |                         |
 151  *           V                         V
 152  *      +---------+               +---------+
 153  *      | carp_if |               | carp_if |
 154  *      +---------+               +---------+
 155  *           |                         |
 156  *           |                         |
 157  *           V        +-------+        V
 158  *        +-----+     |       |     +-----+
 159  *        | scc |---->| softc |<----| scc |
 160  *        +-----+     |       |     +-----+
 161  *           |        +-------+        |
 162  *           |                         |
 163  *           V        +-------+        V
 164  *        +-----+     |       |     +-----+
 165  *        | scc |---->| softc |<----| scc |
 166  *        +-----+     |       |     +-----+
 167  *                    +-------+        |
 168  *                                     |
 169  *                    +-------+        V
 170  *                    |       |     +-----+
 171  *                    | softc |<----| scc |
 172  *                    |       |     +-----+
 173  *                    +-------+
 174  *
 175  *   3) Run netmsg_service_sync(), which will make sure that
 176  *      ocif is no longer accessed (all network operations
 177  *      are happened only in network threads).
 178  *   4) Free ocif -- only carp_if and scc are freed.
 179  *
 180  *
 181  *   Removing carp_softc:
 182  *
 183  *   1) Duplicate the old carp_if to new carp_if (ncif); the to-be-deleted
 184  *      carp_softc will not be duplicated.
 185  *
 186  *        if_carp                     ncif
 187  *           |                         |
 188  *           V                         V
 189  *      +---------+               +---------+
 190  *      | carp_if |               | carp_if |
 191  *      +---------+               +---------+
 192  *           |                         |
 193  *           |                         |
 194  *           V        +-------+        V
 195  *        +-----+     |       |     +-----+
 196  *        | scc |---->| softc |<----| scc |
 197  *        +-----+     |       |     +-----+
 198  *           |        +-------+        |
 199  *           |                         |
 200  *           V        +-------+        |
 201  *        +-----+     |       |        |
 202  *        | scc |---->| softc |        |
 203  *        +-----+     |       |        |
 204  *           |        +-------+        |
 205  *           |                         |
 206  *           V        +-------+        V
 207  *        +-----+     |       |     +-----+
 208  *        | scc |---->| softc |<----| scc |
 209  *        +-----+     |       |     +-----+
 210  *                    +-------+
 211  *
 212  *   2) Switch save if_carp into ocif and switch if_carp to ncif:
 213  *
 214  *          ocif                    if_carp
 215  *           |                         |
 216  *           V                         V
 217  *      +---------+               +---------+
 218  *      | carp_if |               | carp_if |
 219  *      +---------+               +---------+
 220  *           |                         |
 221  *           |                         |
 222  *           V        +-------+        V
 223  *        +-----+     |       |     +-----+
 224  *        | scc |---->| softc |<----| scc |
 225  *        +-----+     |       |     +-----+
 226  *           |        +-------+        |
 227  *           |                         |
 228  *           V        +-------+        |
 229  *        +-----+     |       |        |
 230  *        | scc |---->| softc |        |
 231  *        +-----+     |       |        |
 232  *           |        +-------+        |
 233  *           |                         |
 234  *           V        +-------+        V
 235  *        +-----+     |       |     +-----+
 236  *        | scc |---->| softc |<----| scc |
 237  *        +-----+     |       |     +-----+
 238  *                    +-------+
 239  *
 240  *   3) Run netmsg_service_sync(), which will make sure that
 241  *      ocif is no longer accessed (all network operations
 242  *      are happened only in network threads).
 243  *   4) Free ocif -- only carp_if and scc are freed.
 244  *
 245  * - if_carp accessing:
 246  *   The accessing code should cache the if_carp in a local temporary
 247  *   variable and accessing the temporary variable along the code path
 248  *   instead of accessing if_carp later on.
 249  */
 250
 251 #define CARP_IFNAME             "carp"
 252 #define CARP_IS_RUNNING(ifp)    \
 253         (((ifp)->if_flags & (IFF_UP | IFF_RUNNING)) == (IFF_UP | IFF_RUNNING))
 254
 255 struct carp_softc;
 256
 257 struct carp_vhaddr {
 258         uint32_t                vha_flags;      /* CARP_VHAF_ */
 259         struct in_ifaddr        *vha_ia;        /* carp address */
 260         struct in_ifaddr        *vha_iaback;    /* backing address */
 261         TAILQ_ENTRY(carp_vhaddr) vha_link;
 262 };
 263 TAILQ_HEAD(carp_vhaddr_list, carp_vhaddr);
 264
 265 struct netmsg_carp {
 266         struct netmsg_base      base;
 267         struct ifnet            *nc_carpdev;
 268         struct carp_softc       *nc_softc;
 269         void                    *nc_data;
 270         size_t                  nc_datalen;
 271 };
 272
 273 struct carp_softc {
 274         struct arpcom            arpcom;
 275         struct ifnet            *sc_carpdev;    /* parent interface */
 276         struct carp_vhaddr_list  sc_vha_list;   /* virtual addr list */
 277
 278         const struct in_ifaddr  *sc_ia;         /* primary iface address v4 */
 279         struct ip_moptions       sc_imo;
 280
 281 #ifdef INET6
 282         struct in6_ifaddr       *sc_ia6;        /* primary iface address v6 */
 283         struct ip6_moptions      sc_im6o;
 284 #endif /* INET6 */
 285
 286         enum { INIT = 0, BACKUP, MASTER }
 287                                  sc_state;
 288         boolean_t                sc_dead;
 289
 290         int                      sc_suppress;
 291
 292         int                      sc_sendad_errors;
 293 #define CARP_SENDAD_MAX_ERRORS  3
 294         int                      sc_sendad_success;
 295 #define CARP_SENDAD_MIN_SUCCESS 3
 296
 297         int                      sc_vhid;
 298         int                      sc_advskew;
 299         int                      sc_naddrs;     /* actually used IPv4 vha */
 300         int                      sc_naddrs6;
 301         int                      sc_advbase;    /* seconds */
 302         int                      sc_init_counter;
 303         uint64_t                 sc_counter;
 304
 305         /* authentication */
 306 #define CARP_HMAC_PAD   64
 307         unsigned char            sc_key[CARP_KEY_LEN];
 308         unsigned char            sc_pad[CARP_HMAC_PAD];
 309         SHA1_CTX                 sc_sha1;
 310
 311         struct callout           sc_ad_tmo;     /* advertisement timeout */
 312         struct netmsg_carp       sc_ad_msg;     /* adv timeout netmsg */
 313         struct callout           sc_md_tmo;     /* ip4 master down timeout */
 314         struct callout           sc_md6_tmo;    /* ip6 master down timeout */
 315         struct netmsg_carp       sc_md_msg;     /* master down timeout netmsg */
 316
 317         LIST_ENTRY(carp_softc)   sc_next;       /* Interface clue */
 318 };
 319
 320 #define sc_if   arpcom.ac_if
 321
 322 struct carp_softc_container {
 323         TAILQ_ENTRY(carp_softc_container) scc_link;
 324         struct carp_softc       *scc_softc;
 325 };
 326 TAILQ_HEAD(carp_if, carp_softc_container);
 327
 328 SYSCTL_DECL(_net_inet_carp);
 329
 330 static int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */
 331 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW,
 332     &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets");
 333 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW,
 334     &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode");
 335 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW,
 336     &carp_opts[CARPCTL_LOG], 0, "log bad carp packets");
 337 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW,
 338     &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses");
 339
 340 static int carp_suppress_preempt = 0;
 341 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD,
 342     &carp_suppress_preempt, 0, "Preemption is suppressed");
 343
 344 static struct carpstats carpstats;
 345 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW,
 346     &carpstats, carpstats,
 347     "CARP statistics (struct carpstats, netinet/ip_carp.h)");
 348
 349 #define CARP_LOG(...)   do {                            \
 350         if (carp_opts[CARPCTL_LOG] > 0)                 \
 351                 log(LOG_INFO, __VA_ARGS__);             \
 352 } while (0)
 353
 354 #define CARP_DEBUG(...) do {                            \
 355         if (carp_opts[CARPCTL_LOG] > 1)                 \
 356                 log(LOG_DEBUG, __VA_ARGS__);            \
 357 } while (0)
 358
 359 static struct lwkt_token carp_listtok = LWKT_TOKEN_INITIALIZER(carp_list_token);
 360
 361 static void     carp_hmac_prepare(struct carp_softc *);
 362 static void     carp_hmac_generate(struct carp_softc *, uint32_t *,
 363                     unsigned char *);
 364 static int      carp_hmac_verify(struct carp_softc *, uint32_t *,
 365                     unsigned char *);
 366 static void     carp_setroute(struct carp_softc *, int);
 367 static void     carp_proto_input_c(struct carp_softc *, struct mbuf *,
 368                     struct carp_header *, sa_family_t);
 369 static int      carp_clone_create(struct if_clone *, int, caddr_t);
 370 static int      carp_clone_destroy(struct ifnet *);
 371 static void     carp_detach(struct carp_softc *, boolean_t, boolean_t);
 372 static void     carp_prepare_ad(struct carp_softc *, struct carp_header *);
 373 static void     carp_send_ad_all(void);
 374 static void     carp_send_ad_timeout(void *);
 375 static void     carp_send_ad(struct carp_softc *);
 376 static void     carp_send_arp(struct carp_softc *);
 377 static void     carp_master_down_timeout(void *);
 378 static void     carp_master_down(struct carp_softc *);
 379 static void     carp_setrun(struct carp_softc *, sa_family_t);
 380 static void     carp_set_state(struct carp_softc *, int);
 381 static struct ifnet *carp_forus(struct carp_if *, const uint8_t *);
 382
 383 static void     carp_init(void *);
 384 static int      carp_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
 385 static int      carp_output(struct ifnet *, struct mbuf *, struct sockaddr *,
 386                     struct rtentry *);
 387 static void     carp_start(struct ifnet *, struct ifaltq_subque *);
 388
 389 static void     carp_multicast_cleanup(struct carp_softc *);
 390 static void     carp_add_addr(struct carp_softc *, struct ifaddr *);
 391 static void     carp_del_addr(struct carp_softc *, struct ifaddr *);
 392 static void     carp_config_addr(struct carp_softc *, struct ifaddr *);
 393 static void     carp_link_addrs(struct carp_softc *, struct ifnet *,
 394                     struct ifaddr *);
 395 static void     carp_unlink_addrs(struct carp_softc *, struct ifnet *,
 396                     struct ifaddr *);
 397 static void     carp_update_addrs(struct carp_softc *, struct ifaddr *);
 398
 399 static int      carp_config_vhaddr(struct carp_softc *, struct carp_vhaddr *,
 400                     struct in_ifaddr *);
 401 static int      carp_activate_vhaddr(struct carp_softc *, struct carp_vhaddr *,
 402                     struct ifnet *, struct in_ifaddr *, int);
 403 static void     carp_deactivate_vhaddr(struct carp_softc *,
 404                     struct carp_vhaddr *, boolean_t);
 405 static int      carp_addroute_vhaddr(struct carp_softc *, struct carp_vhaddr *);
 406 static void     carp_delroute_vhaddr(struct carp_softc *, struct carp_vhaddr *,
 407                     boolean_t);
 408
 409 #ifdef foo
 410 static void     carp_sc_state(struct carp_softc *);
 411 #endif
 412 #ifdef INET6
 413 static void     carp_send_na(struct carp_softc *);
 414 #ifdef notyet
 415 static int      carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *);
 416 static int      carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *);
 417 #endif
 418 static void     carp_multicast6_cleanup(struct carp_softc *);
 419 #endif
 420 static void     carp_stop(struct carp_softc *, boolean_t);
 421 static void     carp_suspend(struct carp_softc *, boolean_t);
 422 static void     carp_ioctl_stop(struct carp_softc *);
 423 static int      carp_ioctl_setvh(struct carp_softc *, void *, struct ucred *);
 424 static int      carp_ioctl_getvh(struct carp_softc *, void *, struct ucred *);
 425 static int      carp_ioctl_getdevname(struct carp_softc *, struct ifdrv *);
 426 static int      carp_ioctl_getvhaddr(struct carp_softc *, struct ifdrv *);
 427
 428 static struct carp_if *carp_if_remove(struct carp_if *, struct carp_softc *);
 429 static struct carp_if *carp_if_insert(struct carp_if *, struct carp_softc *);
 430 static void     carp_if_free(struct carp_if *);
 431
 432 static void     carp_ifaddr(void *, struct ifnet *, enum ifaddr_event,
 433                             struct ifaddr *);
 434 static void     carp_ifdetach(void *, struct ifnet *);
 435
 436 static void     carp_ifdetach_dispatch(netmsg_t);
 437 static void     carp_clone_destroy_dispatch(netmsg_t);
 438 static void     carp_init_dispatch(netmsg_t);
 439 static void     carp_ioctl_stop_dispatch(netmsg_t);
 440 static void     carp_ioctl_setvh_dispatch(netmsg_t);
 441 static void     carp_ioctl_getvh_dispatch(netmsg_t);
 442 static void     carp_ioctl_getdevname_dispatch(netmsg_t);
 443 static void     carp_ioctl_getvhaddr_dispatch(netmsg_t);
 444 static void     carp_send_ad_timeout_dispatch(netmsg_t);
 445 static void     carp_master_down_timeout_dispatch(netmsg_t);
 446
 447 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces");
 448
 449 static LIST_HEAD(, carp_softc) carpif_list;
 450
 451 static struct if_clone carp_cloner =
 452 IF_CLONE_INITIALIZER(CARP_IFNAME, carp_clone_create, carp_clone_destroy,
 453                      0, IF_MAXUNIT);
 454
 455 static uint8_t  carp_etheraddr[ETHER_ADDR_LEN] = { 0, 0, 0x5e, 0, 1, 0 };
 456
 457 static eventhandler_tag carp_ifdetach_event;
 458 static eventhandler_tag carp_ifaddr_event;
 459
 460 static __inline void
 461 carp_insert_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha_new)
 462 {
 463         struct carp_vhaddr *vha;
 464         u_long new_addr, addr;
 465
 466         KKASSERT((vha_new->vha_flags & CARP_VHAF_ONLIST) == 0);
 467
 468         /*
 469          * Virtual address list is sorted; smaller one first
 470          */
 471         new_addr = ntohl(vha_new->vha_ia->ia_addr.sin_addr.s_addr);
 472
 473         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
 474                 addr = ntohl(vha->vha_ia->ia_addr.sin_addr.s_addr);
 475
 476                 if (addr > new_addr)
 477                         break;
 478         }
 479         if (vha == NULL)
 480                 TAILQ_INSERT_TAIL(&sc->sc_vha_list, vha_new, vha_link);
 481         else
 482                 TAILQ_INSERT_BEFORE(vha, vha_new, vha_link);
 483         vha_new->vha_flags |= CARP_VHAF_ONLIST;
 484 }
 485
 486 static __inline void
 487 carp_remove_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha)
 488 {
 489         KKASSERT(vha->vha_flags & CARP_VHAF_ONLIST);
 490         vha->vha_flags &= ~CARP_VHAF_ONLIST;
 491         TAILQ_REMOVE(&sc->sc_vha_list, vha, vha_link);
 492 }
 493
 494 static void
 495 carp_hmac_prepare(struct carp_softc *sc)
 496 {
 497         uint8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
 498         uint8_t vhid = sc->sc_vhid & 0xff;
 499         int i;
 500 #ifdef INET6
 501         struct ifaddr_container *ifac;
 502         struct in6_addr in6;
 503 #endif
 504 #ifdef INET
 505         struct carp_vhaddr *vha;
 506 #endif
 507
 508         /* XXX: possible race here */
 509
 510         /* compute ipad from key */
 511         bzero(sc->sc_pad, sizeof(sc->sc_pad));
 512         bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
 513         for (i = 0; i < sizeof(sc->sc_pad); i++)
 514                 sc->sc_pad[i] ^= 0x36;
 515
 516         /* precompute first part of inner hash */
 517         SHA1Init(&sc->sc_sha1);
 518         SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
 519         SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
 520         SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
 521         SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
 522 #ifdef INET
 523         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
 524                 SHA1Update(&sc->sc_sha1,
 525                     (const uint8_t *)&vha->vha_ia->ia_addr.sin_addr,
 526                     sizeof(struct in_addr));
 527         }
 528 #endif /* INET */
 529 #ifdef INET6
 530         TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
 531                 struct ifaddr *ifa = ifac->ifa;
 532
 533                 if (ifa->ifa_addr->sa_family == AF_INET6) {
 534                         in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
 535                         in6_clearscope(&in6);
 536                         SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6));
 537                 }
 538         }
 539 #endif /* INET6 */
 540
 541         /* convert ipad to opad */
 542         for (i = 0; i < sizeof(sc->sc_pad); i++)
 543                 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
 544 }
 545
 546 static void
 547 carp_hmac_generate(struct carp_softc *sc, uint32_t counter[2],
 548     unsigned char md[20])
 549 {
 550         SHA1_CTX sha1ctx;
 551
 552         /* fetch first half of inner hash */
 553         bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
 554
 555         SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
 556         SHA1Final(md, &sha1ctx);
 557
 558         /* outer hash */
 559         SHA1Init(&sha1ctx);
 560         SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
 561         SHA1Update(&sha1ctx, md, 20);
 562         SHA1Final(md, &sha1ctx);
 563 }
 564
 565 static int
 566 carp_hmac_verify(struct carp_softc *sc, uint32_t counter[2],
 567     unsigned char md[20])
 568 {
 569         unsigned char md2[20];
 570
 571         carp_hmac_generate(sc, counter, md2);
 572         return (bcmp(md, md2, sizeof(md2)));
 573 }
 574
 575 static void
 576 carp_setroute(struct carp_softc *sc, int cmd)
 577 {
 578 #ifdef INET6
 579         struct ifaddr_container *ifac;
 580 #endif
 581         struct carp_vhaddr *vha;
 582
 583         KKASSERT(cmd == RTM_DELETE || cmd == RTM_ADD);
 584
 585         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
 586                 if (vha->vha_iaback == NULL)
 587                         continue;
 588                 if (cmd == RTM_DELETE)
 589                         carp_delroute_vhaddr(sc, vha, FALSE);
 590                 else
 591                         carp_addroute_vhaddr(sc, vha);
 592         }
 593
 594 #ifdef INET6
 595         TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
 596                 struct ifaddr *ifa = ifac->ifa;
 597
 598                 if (ifa->ifa_addr->sa_family == AF_INET6) {
 599                         if (cmd == RTM_ADD)
 600                                 in6_ifaddloop(ifa);
 601                         else
 602                                 in6_ifremloop(ifa);
 603                 }
 604         }
 605 #endif /* INET6 */
 606 }
 607
 608 static int
 609 carp_clone_create(struct if_clone *ifc, int unit, caddr_t param __unused)
 610 {
 611         struct carp_softc *sc;
 612         struct ifnet *ifp;
 613
 614         sc = kmalloc(sizeof(*sc), M_CARP, M_WAITOK | M_ZERO);
 615         ifp = &sc->sc_if;
 616
 617         sc->sc_suppress = 0;
 618         sc->sc_advbase = CARP_DFLTINTV;
 619         sc->sc_vhid = -1;       /* required setting */
 620         sc->sc_advskew = 0;
 621         sc->sc_init_counter = 1;
 622         sc->sc_naddrs = 0;
 623         sc->sc_naddrs6 = 0;
 624
 625         TAILQ_INIT(&sc->sc_vha_list);
 626
 627 #ifdef INET6
 628         sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
 629 #endif
 630
 631         callout_init_mp(&sc->sc_ad_tmo);
 632         netmsg_init(&sc->sc_ad_msg.base, NULL, &netisr_adone_rport,
 633             MSGF_DROPABLE | MSGF_PRIORITY, carp_send_ad_timeout_dispatch);
 634         sc->sc_ad_msg.nc_softc = sc;
 635
 636         callout_init_mp(&sc->sc_md_tmo);
 637         callout_init_mp(&sc->sc_md6_tmo);
 638         netmsg_init(&sc->sc_md_msg.base, NULL, &netisr_adone_rport,
 639             MSGF_DROPABLE | MSGF_PRIORITY, carp_master_down_timeout_dispatch);
 640         sc->sc_md_msg.nc_softc = sc;
 641
 642         if_initname(ifp, CARP_IFNAME, unit);
 643         ifp->if_softc = sc;
 644         ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
 645         ifp->if_init = carp_init;
 646         ifp->if_ioctl = carp_ioctl;
 647         ifp->if_start = carp_start;
 648         ifq_set_maxlen(&ifp->if_snd, ifqmaxlen);
 649         ifq_set_ready(&ifp->if_snd);
 650
 651         ether_ifattach(ifp, carp_etheraddr, NULL);
 652
 653         ifp->if_type = IFT_CARP;
 654         ifp->if_output = carp_output;
 655
 656         lwkt_gettoken(&carp_listtok);
 657         LIST_INSERT_HEAD(&carpif_list, sc, sc_next);
 658         lwkt_reltoken(&carp_listtok);
 659
 660         return (0);
 661 }
 662
 663 static void
 664 carp_clone_destroy_dispatch(netmsg_t msg)
 665 {
 666         struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
 667         struct carp_softc *sc = cmsg->nc_softc;
 668
 669         sc->sc_dead = TRUE;
 670         carp_detach(sc, TRUE, FALSE);
 671
 672         callout_stop_sync(&sc->sc_ad_tmo);
 673         callout_stop_sync(&sc->sc_md_tmo);
 674         callout_stop_sync(&sc->sc_md6_tmo);
 675
 676         crit_enter();
 677         lwkt_dropmsg(&sc->sc_ad_msg.base.lmsg);
 678         lwkt_dropmsg(&sc->sc_md_msg.base.lmsg);
 679         crit_exit();
 680
 681         lwkt_replymsg(&cmsg->base.lmsg, 0);
 682 }
 683
 684 static int
 685 carp_clone_destroy(struct ifnet *ifp)
 686 {
 687         struct carp_softc *sc = ifp->if_softc;
 688         struct netmsg_carp cmsg;
 689
 690         bzero(&cmsg, sizeof(cmsg));
 691         netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
 692             carp_clone_destroy_dispatch);
 693         cmsg.nc_softc = sc;
 694
 695         lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
 696
 697         lwkt_gettoken(&carp_listtok);
 698         LIST_REMOVE(sc, sc_next);
 699         lwkt_reltoken(&carp_listtok);
 700
 701         bpfdetach(ifp);
 702         if_detach(ifp);
 703
 704         KASSERT(sc->sc_naddrs == 0, ("certain inet address is still active"));
 705         kfree(sc, M_CARP);
 706
 707         return 0;
 708 }
 709
 710 static struct carp_if *
 711 carp_if_remove(struct carp_if *ocif, struct carp_softc *sc)
 712 {
 713         struct carp_softc_container *oscc, *scc;
 714         struct carp_if *cif;
 715         int count = 0;
 716 #ifdef INVARIANTS
 717         int found = 0;
 718 #endif
 719
 720         TAILQ_FOREACH(oscc, ocif, scc_link) {
 721                 ++count;
 722 #ifdef INVARIANTS
 723                 if (oscc->scc_softc == sc)
 724                         found = 1;
 725 #endif
 726         }
 727         KASSERT(found, ("%s carp_softc is not on carp_if", __func__));
 728
 729         if (count == 1) {
 730                 /* Last one is going to be unlinked */
 731                 return NULL;
 732         }
 733
 734         cif = kmalloc(sizeof(*cif), M_CARP, M_WAITOK | M_ZERO);
 735         TAILQ_INIT(cif);
 736
 737         TAILQ_FOREACH(oscc, ocif, scc_link) {
 738                 if (oscc->scc_softc == sc)
 739                         continue;
 740
 741                 scc = kmalloc(sizeof(*scc), M_CARP, M_WAITOK | M_ZERO);
 742                 scc->scc_softc = oscc->scc_softc;
 743                 TAILQ_INSERT_TAIL(cif, scc, scc_link);
 744         }
 745
 746         return cif;
 747 }
 748
 749 static struct carp_if *
 750 carp_if_insert(struct carp_if *ocif, struct carp_softc *sc)
 751 {
 752         struct carp_softc_container *oscc;
 753         int onlist;
 754
 755         onlist = 0;
 756         if (ocif != NULL) {
 757                 TAILQ_FOREACH(oscc, ocif, scc_link) {
 758                         if (oscc->scc_softc == sc)
 759                                 onlist = 1;
 760                 }
 761         }
 762
 763 #ifdef INVARIANTS
 764         if (sc->sc_carpdev != NULL) {
 765                 KASSERT(onlist, ("%s is not on %s carp list",
 766                     sc->sc_if.if_xname, sc->sc_carpdev->if_xname));
 767         } else {
 768                 KASSERT(!onlist, ("%s is already on carp list",
 769                     sc->sc_if.if_xname));
 770         }
 771 #endif
 772
 773         if (!onlist) {
 774                 struct carp_if *cif;
 775                 struct carp_softc_container *new_scc, *scc;
 776                 int inserted = 0;
 777
 778                 cif = kmalloc(sizeof(*cif), M_CARP, M_WAITOK | M_ZERO);
 779                 TAILQ_INIT(cif);
 780
 781                 new_scc = kmalloc(sizeof(*new_scc), M_CARP, M_WAITOK | M_ZERO);
 782                 new_scc->scc_softc = sc;
 783
 784                 if (ocif != NULL) {
 785                         TAILQ_FOREACH(oscc, ocif, scc_link) {
 786                                 if (!inserted &&
 787                                     oscc->scc_softc->sc_vhid > sc->sc_vhid) {
 788                                         TAILQ_INSERT_TAIL(cif, new_scc,
 789                                             scc_link);
 790                                         inserted = 1;
 791                                 }
 792
 793                                 scc = kmalloc(sizeof(*scc), M_CARP,
 794                                     M_WAITOK | M_ZERO);
 795                                 scc->scc_softc = oscc->scc_softc;
 796                                 TAILQ_INSERT_TAIL(cif, scc, scc_link);
 797                         }
 798                 }
 799                 if (!inserted)
 800                         TAILQ_INSERT_TAIL(cif, new_scc, scc_link);
 801
 802                 return cif;
 803         } else {
 804                 return ocif;
 805         }
 806 }
 807
 808 static void
 809 carp_if_free(struct carp_if *cif)
 810 {
 811         struct carp_softc_container *scc;
 812
 813         while ((scc = TAILQ_FIRST(cif)) != NULL) {
 814                 TAILQ_REMOVE(cif, scc, scc_link);
 815                 kfree(scc, M_CARP);
 816         }
 817         kfree(cif, M_CARP);
 818 }
 819
 820 static void
 821 carp_detach(struct carp_softc *sc, boolean_t detach, boolean_t del_iaback)
 822 {
 823         carp_suspend(sc, detach);
 824
 825         carp_multicast_cleanup(sc);
 826 #ifdef INET6
 827         carp_multicast6_cleanup(sc);
 828 #endif
 829
 830         if (!sc->sc_dead && detach) {
 831                 struct carp_vhaddr *vha;
 832
 833                 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
 834                         carp_deactivate_vhaddr(sc, vha, del_iaback);
 835                 KKASSERT(sc->sc_naddrs == 0);
 836         }
 837
 838         if (sc->sc_carpdev != NULL) {
 839                 struct ifnet *ifp = sc->sc_carpdev;
 840                 struct carp_if *ocif = ifp->if_carp;
 841
 842                 ifp->if_carp = carp_if_remove(ocif, sc);
 843                 KASSERT(ifp->if_carp != ocif,
 844                     ("%s carp_if_remove failed", __func__));
 845
 846                 sc->sc_carpdev = NULL;
 847                 sc->sc_ia = NULL;
 848
 849                 /*
 850                  * Make sure that all protocol threads see the
 851                  * sc_carpdev and if_carp changes
 852                  */
 853                 netmsg_service_sync();
 854
 855                 if (ifp->if_carp == NULL) {
 856                         /*
 857                          * No more carp interfaces using
 858                          * ifp as the backing interface,
 859                          * move it out of promiscous mode.
 860                          */
 861                         ifpromisc(ifp, 0);
 862                 }
 863
 864                 /*
 865                  * The old carp list could be safely free now,
 866                  * since no one can access it.
 867                  */
 868                 carp_if_free(ocif);
 869         }
 870 }
 871
 872 static void
 873 carp_ifdetach_dispatch(netmsg_t msg)
 874 {
 875         struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
 876         struct ifnet *ifp = cmsg->nc_carpdev;
 877
 878         while (ifp->if_carp) {
 879                 struct carp_softc_container *scc;
 880
 881                 scc = TAILQ_FIRST((struct carp_if *)(ifp->if_carp));
 882                 carp_detach(scc->scc_softc, TRUE, TRUE);
 883         }
 884         lwkt_replymsg(&cmsg->base.lmsg, 0);
 885 }
 886
 887 /* Detach an interface from the carp. */
 888 static void
 889 carp_ifdetach(void *arg __unused, struct ifnet *ifp)
 890 {
 891         struct netmsg_carp cmsg;
 892
 893         ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp);
 894
 895         bzero(&cmsg, sizeof(cmsg));
 896         netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
 897             carp_ifdetach_dispatch);
 898         cmsg.nc_carpdev = ifp;
 899
 900         lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
 901 }
 902
 903 /*
 904  * process input packet.
 905  * we have rearranged checks order compared to the rfc,
 906  * but it seems more efficient this way or not possible otherwise.
 907  */
 908 int
 909 carp_proto_input(struct mbuf **mp, int *offp, int proto)
 910 {
 911         struct mbuf *m = *mp;
 912         struct ip *ip = mtod(m, struct ip *);
 913         struct ifnet *ifp = m->m_pkthdr.rcvif;
 914         struct carp_header *ch;
 915         struct carp_softc *sc;
 916         int len, iphlen;
 917
 918         iphlen = *offp;
 919         *mp = NULL;
 920
 921         carpstats.carps_ipackets++;
 922
 923         if (!carp_opts[CARPCTL_ALLOW]) {
 924                 m_freem(m);
 925                 goto back;
 926         }
 927
 928         /* Check if received on a valid carp interface */
 929         if (ifp->if_type != IFT_CARP) {
 930                 carpstats.carps_badif++;
 931                 CARP_LOG("carp_proto_input: packet received on non-carp "
 932                     "interface: %s\n", ifp->if_xname);
 933                 m_freem(m);
 934                 goto back;
 935         }
 936
 937         if (!CARP_IS_RUNNING(ifp)) {
 938                 carpstats.carps_badif++;
 939                 CARP_LOG("carp_proto_input: packet received on stopped carp "
 940                     "interface: %s\n", ifp->if_xname);
 941                 m_freem(m);
 942                 goto back;
 943         }
 944
 945         sc = ifp->if_softc;
 946         if (sc->sc_carpdev == NULL) {
 947                 carpstats.carps_badif++;
 948                 CARP_LOG("carp_proto_input: packet received on defunc carp "
 949                     "interface: %s\n", ifp->if_xname);
 950                 m_freem(m);
 951                 goto back;
 952         }
 953
 954         if (!IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 955                 carpstats.carps_badif++;
 956                 CARP_LOG("carp_proto_input: non-mcast packet on "
 957                     "interface: %s\n", ifp->if_xname);
 958                 m_freem(m);
 959                 goto back;
 960         }
 961
 962         /* Verify that the IP TTL is CARP_DFLTTL. */
 963         if (ip->ip_ttl != CARP_DFLTTL) {
 964                 carpstats.carps_badttl++;
 965                 CARP_LOG("carp_proto_input: received ttl %d != %d on %s\n",
 966                     ip->ip_ttl, CARP_DFLTTL, ifp->if_xname);
 967                 m_freem(m);
 968                 goto back;
 969         }
 970
 971         /* Minimal CARP packet size */
 972         len = iphlen + sizeof(*ch);
 973
 974         /*
 975          * Verify that the received packet length is
 976          * not less than the CARP header
 977          */
 978         if (m->m_pkthdr.len < len) {
 979                 carpstats.carps_badlen++;
 980                 CARP_LOG("packet too short %d on %s\n", m->m_pkthdr.len,
 981                     ifp->if_xname);
 982                 m_freem(m);
 983                 goto back;
 984         }
 985
 986         /* Make sure that CARP header is contiguous */
 987         if (len > m->m_len) {
 988                 m = m_pullup(m, len);
 989                 if (m == NULL) {
 990                         carpstats.carps_hdrops++;
 991                         CARP_LOG("carp_proto_input: m_pullup failed\n");
 992                         goto back;
 993                 }
 994                 ip = mtod(m, struct ip *);
 995         }
 996         ch = (struct carp_header *)((uint8_t *)ip + iphlen);
 997
 998         /* Verify the CARP checksum */
 999         if (in_cksum_skip(m, len, iphlen)) {
1000                 carpstats.carps_badsum++;
1001                 CARP_LOG("carp_proto_input: checksum failed on %s\n",
1002                     ifp->if_xname);
1003                 m_freem(m);
1004                 goto back;
1005         }
1006         carp_proto_input_c(sc, m, ch, AF_INET);
1007 back:
1008         return(IPPROTO_DONE);
1009 }
1010
1011 #ifdef INET6
1012 int
1013 carp6_proto_input(struct mbuf **mp, int *offp, int proto)
1014 {
1015         struct mbuf *m = *mp;
1016         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1017         struct ifnet *ifp = m->m_pkthdr.rcvif;
1018         struct carp_header *ch;
1019         struct carp_softc *sc;
1020         u_int len;
1021
1022         carpstats.carps_ipackets6++;
1023
1024         if (!carp_opts[CARPCTL_ALLOW]) {
1025                 m_freem(m);
1026                 goto back;
1027         }
1028
1029         /* check if received on a valid carp interface */
1030         if (ifp->if_type != IFT_CARP) {
1031                 carpstats.carps_badif++;
1032                 CARP_LOG("carp6_proto_input: packet received on non-carp "
1033                     "interface: %s\n", ifp->if_xname);
1034                 m_freem(m);
1035                 goto back;
1036         }
1037
1038         if (!CARP_IS_RUNNING(ifp)) {
1039                 carpstats.carps_badif++;
1040                 CARP_LOG("carp_proto_input: packet received on stopped carp "
1041                     "interface: %s\n", ifp->if_xname);
1042                 m_freem(m);
1043                 goto back;
1044         }
1045
1046         sc = ifp->if_softc;
1047         if (sc->sc_carpdev == NULL) {
1048                 carpstats.carps_badif++;
1049                 CARP_LOG("carp6_proto_input: packet received on defunc-carp "
1050                     "interface: %s\n", ifp->if_xname);
1051                 m_freem(m);
1052                 goto back;
1053         }
1054
1055         /* verify that the IP TTL is 255 */
1056         if (ip6->ip6_hlim != CARP_DFLTTL) {
1057                 carpstats.carps_badttl++;
1058                 CARP_LOG("carp6_proto_input: received ttl %d != 255 on %s\n",
1059                     ip6->ip6_hlim, ifp->if_xname);
1060                 m_freem(m);
1061                 goto back;
1062         }
1063
1064         /* verify that we have a complete carp packet */
1065         len = m->m_len;
1066         IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
1067         if (ch == NULL) {
1068                 carpstats.carps_badlen++;
1069                 CARP_LOG("carp6_proto_input: packet size %u too small\n", len);
1070                 goto back;
1071         }
1072
1073         /* verify the CARP checksum */
1074         if (in_cksum_range(m, 0, *offp, sizeof(*ch))) {
1075                 carpstats.carps_badsum++;
1076                 CARP_LOG("carp6_proto_input: checksum failed, on %s\n",
1077                     ifp->if_xname);
1078                 m_freem(m);
1079                 goto back;
1080         }
1081
1082         carp_proto_input_c(sc, m, ch, AF_INET6);
1083 back:
1084         return (IPPROTO_DONE);
1085 }
1086 #endif /* INET6 */
1087
1088 static void
1089 carp_proto_input_c(struct carp_softc *sc, struct mbuf *m,
1090     struct carp_header *ch, sa_family_t af)
1091 {
1092         struct ifnet *cifp;
1093         uint64_t tmp_counter;
1094         struct timeval sc_tv, ch_tv;
1095
1096         if (sc->sc_vhid != ch->carp_vhid) {
1097                 /*
1098                  * CARP uses multicast, however, multicast packets
1099                  * are tapped to all CARP interfaces on the physical
1100                  * interface receiving the CARP packets, so we don't
1101                  * update any stats here.
1102                  */
1103                 m_freem(m);
1104                 return;
1105         }
1106         cifp = &sc->sc_if;
1107
1108         /* verify the CARP version. */
1109         if (ch->carp_version != CARP_VERSION) {
1110                 carpstats.carps_badver++;
1111                 CARP_LOG("%s; invalid version %d\n", cifp->if_xname,
1112                          ch->carp_version);
1113                 m_freem(m);
1114                 return;
1115         }
1116
1117         /* verify the hash */
1118         if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
1119                 carpstats.carps_badauth++;
1120                 CARP_LOG("%s: incorrect hash\n", cifp->if_xname);
1121                 m_freem(m);
1122                 return;
1123         }
1124
1125         tmp_counter = ntohl(ch->carp_counter[0]);
1126         tmp_counter = tmp_counter<<32;
1127         tmp_counter += ntohl(ch->carp_counter[1]);
1128
1129         /* XXX Replay protection goes here */
1130
1131         sc->sc_init_counter = 0;
1132         sc->sc_counter = tmp_counter;
1133
1134         sc_tv.tv_sec = sc->sc_advbase;
1135         if (carp_suppress_preempt && sc->sc_advskew <  240)
1136                 sc_tv.tv_usec = 240 * 1000000 / 256;
1137         else
1138                 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1139         ch_tv.tv_sec = ch->carp_advbase;
1140         ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
1141
1142         switch (sc->sc_state) {
1143         case INIT:
1144                 break;
1145
1146         case MASTER:
1147                 /*
1148                  * If we receive an advertisement from a master who's going to
1149                  * be more frequent than us, go into BACKUP state.
1150                  */
1151                 if (timevalcmp(&sc_tv, &ch_tv, >) ||
1152                     timevalcmp(&sc_tv, &ch_tv, ==)) {
1153                         callout_stop(&sc->sc_ad_tmo);
1154                         CARP_DEBUG("%s: MASTER -> BACKUP "
1155                            "(more frequent advertisement received)\n",
1156                            cifp->if_xname);
1157                         carp_set_state(sc, BACKUP);
1158                         carp_setrun(sc, 0);
1159                         carp_setroute(sc, RTM_DELETE);
1160                 }
1161                 break;
1162
1163         case BACKUP:
1164                 /*
1165                  * If we're pre-empting masters who advertise slower than us,
1166                  * and this one claims to be slower, treat him as down.
1167                  */
1168                 if (carp_opts[CARPCTL_PREEMPT] &&
1169                     timevalcmp(&sc_tv, &ch_tv, <)) {
1170                         CARP_DEBUG("%s: BACKUP -> MASTER "
1171                             "(preempting a slower master)\n", cifp->if_xname);
1172                         carp_master_down(sc);
1173                         break;
1174                 }
1175
1176                 /*
1177                  *  If the master is going to advertise at such a low frequency
1178                  *  that he's guaranteed to time out, we'd might as well just
1179                  *  treat him as timed out now.
1180                  */
1181                 sc_tv.tv_sec = sc->sc_advbase * 3;
1182                 if (timevalcmp(&sc_tv, &ch_tv, <)) {
1183                         CARP_DEBUG("%s: BACKUP -> MASTER (master timed out)\n",
1184                                    cifp->if_xname);
1185                         carp_master_down(sc);
1186                         break;
1187                 }
1188
1189                 /*
1190                  * Otherwise, we reset the counter and wait for the next
1191                  * advertisement.
1192                  */
1193                 carp_setrun(sc, af);
1194                 break;
1195         }
1196         m_freem(m);
1197 }
1198
1199 struct mbuf *
1200 carp_input(void *v, struct mbuf *m)
1201 {
1202         struct carp_if *cif = v;
1203         struct ether_header *eh;
1204         struct carp_softc_container *scc;
1205         struct ifnet *ifp;
1206
1207         eh = mtod(m, struct ether_header *);
1208
1209         ifp = carp_forus(cif, eh->ether_dhost);
1210         if (ifp != NULL) {
1211                 ether_reinput_oncpu(ifp, m, REINPUT_RUNBPF);
1212                 return NULL;
1213         }
1214
1215         if ((m->m_flags & (M_BCAST | M_MCAST)) == 0)
1216                 return m;
1217
1218         /*
1219          * XXX Should really check the list of multicast addresses
1220          * for each CARP interface _before_ copying.
1221          */
1222         TAILQ_FOREACH(scc, cif, scc_link) {
1223                 struct carp_softc *sc = scc->scc_softc;
1224                 struct mbuf *m0;
1225
1226                 if ((sc->sc_if.if_flags & IFF_UP) == 0)
1227                         continue;
1228
1229                 m0 = m_dup(m, MB_DONTWAIT);
1230                 if (m0 == NULL)
1231                         continue;
1232
1233                 ether_reinput_oncpu(&sc->sc_if, m0, REINPUT_RUNBPF);
1234         }
1235         return m;
1236 }
1237
1238 static void
1239 carp_prepare_ad(struct carp_softc *sc, struct carp_header *ch)
1240 {
1241         if (sc->sc_init_counter) {
1242                 /* this could also be seconds since unix epoch */
1243                 sc->sc_counter = karc4random();
1244                 sc->sc_counter = sc->sc_counter << 32;
1245                 sc->sc_counter += karc4random();
1246         } else {
1247                 sc->sc_counter++;
1248         }
1249
1250         ch->carp_counter[0] = htonl((sc->sc_counter >> 32) & 0xffffffff);
1251         ch->carp_counter[1] = htonl(sc->sc_counter & 0xffffffff);
1252
1253         carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
1254 }
1255
1256 static void
1257 carp_send_ad_all(void)
1258 {
1259         struct carp_softc *sc;
1260
1261         LIST_FOREACH(sc, &carpif_list, sc_next) {
1262                 if (sc->sc_carpdev == NULL)
1263                         continue;
1264
1265                 if (CARP_IS_RUNNING(&sc->sc_if) && sc->sc_state == MASTER)
1266                         carp_send_ad(sc);
1267         }
1268 }
1269
1270 static void
1271 carp_send_ad_timeout(void *xsc)
1272 {
1273         struct carp_softc *sc = xsc;
1274         struct netmsg_carp *cmsg = &sc->sc_ad_msg;
1275
1276         KASSERT(mycpuid == 0, ("%s not on cpu0 but on cpu%d",
1277             __func__, mycpuid));
1278
1279         crit_enter();
1280         if (cmsg->base.lmsg.ms_flags & MSGF_DONE)
1281                 lwkt_sendmsg(netisr_cpuport(0), &cmsg->base.lmsg);
1282         crit_exit();
1283 }
1284
1285 static void
1286 carp_send_ad_timeout_dispatch(netmsg_t msg)
1287 {
1288         struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
1289         struct carp_softc *sc = cmsg->nc_softc;
1290
1291         /* Reply ASAP */
1292         crit_enter();
1293         lwkt_replymsg(&cmsg->base.lmsg, 0);
1294         crit_exit();
1295
1296         carp_send_ad(sc);
1297 }
1298
1299 static void
1300 carp_send_ad(struct carp_softc *sc)
1301 {
1302         struct ifnet *cifp = &sc->sc_if;
1303         struct carp_header ch;
1304         struct timeval tv;
1305         struct carp_header *ch_ptr;
1306         struct mbuf *m;
1307         int len, advbase, advskew;
1308
1309         if (!CARP_IS_RUNNING(cifp)) {
1310                 /* Bow out */
1311                 advbase = 255;
1312                 advskew = 255;
1313         } else {
1314                 advbase = sc->sc_advbase;
1315                 if (!carp_suppress_preempt || sc->sc_advskew > 240)
1316                         advskew = sc->sc_advskew;
1317                 else
1318                         advskew = 240;
1319                 tv.tv_sec = advbase;
1320                 tv.tv_usec = advskew * 1000000 / 256;
1321         }
1322
1323         ch.carp_version = CARP_VERSION;
1324         ch.carp_type = CARP_ADVERTISEMENT;
1325         ch.carp_vhid = sc->sc_vhid;
1326         ch.carp_advbase = advbase;
1327         ch.carp_advskew = advskew;
1328         ch.carp_authlen = 7;    /* XXX DEFINE */
1329         ch.carp_pad1 = 0;       /* must be zero */
1330         ch.carp_cksum = 0;
1331
1332 #ifdef INET
1333         if (sc->sc_ia != NULL) {
1334                 struct ip *ip;
1335
1336                 MGETHDR(m, MB_DONTWAIT, MT_HEADER);
1337                 if (m == NULL) {
1338                         IFNET_STAT_INC(cifp, oerrors, 1);
1339                         carpstats.carps_onomem++;
1340                         /* XXX maybe less ? */
1341                         if (advbase != 255 || advskew != 255)
1342                                 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1343                                     carp_send_ad_timeout, sc);
1344                         return;
1345                 }
1346                 len = sizeof(*ip) + sizeof(ch);
1347                 m->m_pkthdr.len = len;
1348                 m->m_pkthdr.rcvif = NULL;
1349                 m->m_len = len;
1350                 MH_ALIGN(m, m->m_len);
1351                 m->m_flags |= M_MCAST;
1352                 ip = mtod(m, struct ip *);
1353                 ip->ip_v = IPVERSION;
1354                 ip->ip_hl = sizeof(*ip) >> 2;
1355                 ip->ip_tos = IPTOS_LOWDELAY;
1356                 ip->ip_len = len;
1357                 ip->ip_id = ip_newid();
1358                 ip->ip_off = IP_DF;
1359                 ip->ip_ttl = CARP_DFLTTL;
1360                 ip->ip_p = IPPROTO_CARP;
1361                 ip->ip_sum = 0;
1362                 ip->ip_src = sc->sc_ia->ia_addr.sin_addr;
1363                 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
1364
1365                 ch_ptr = (struct carp_header *)(&ip[1]);
1366                 bcopy(&ch, ch_ptr, sizeof(ch));
1367                 carp_prepare_ad(sc, ch_ptr);
1368                 ch_ptr->carp_cksum = in_cksum_skip(m, len, sizeof(*ip));
1369
1370                 getmicrotime(&cifp->if_lastchange);
1371                 IFNET_STAT_INC(cifp, opackets, 1);
1372                 IFNET_STAT_INC(cifp, obytes, len);
1373                 carpstats.carps_opackets++;
1374
1375                 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) {
1376                         IFNET_STAT_INC(cifp, oerrors, 1);
1377                         if (sc->sc_sendad_errors < INT_MAX)
1378                                 sc->sc_sendad_errors++;
1379                         if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1380                                 carp_suppress_preempt++;
1381                                 if (carp_suppress_preempt == 1) {
1382                                         carp_send_ad_all();
1383                                 }
1384                         }
1385                         sc->sc_sendad_success = 0;
1386                 } else {
1387                         if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1388                                 if (++sc->sc_sendad_success >=
1389                                     CARP_SENDAD_MIN_SUCCESS) {
1390                                         carp_suppress_preempt--;
1391                                         sc->sc_sendad_errors = 0;
1392                                 }
1393                         } else {
1394                                 sc->sc_sendad_errors = 0;
1395                         }
1396                 }
1397         }
1398 #endif /* INET */
1399 #ifdef INET6
1400         if (sc->sc_ia6) {
1401                 struct ip6_hdr *ip6;
1402
1403                 MGETHDR(m, MB_DONTWAIT, MT_HEADER);
1404                 if (m == NULL) {
1405                         IFNET_STAT_INC(cifp, oerrors, 1);
1406                         carpstats.carps_onomem++;
1407                         /* XXX maybe less ? */
1408                         if (advbase != 255 || advskew != 255)
1409                                 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1410                                     carp_send_ad_timeout, sc);
1411                         return;
1412                 }
1413                 len = sizeof(*ip6) + sizeof(ch);
1414                 m->m_pkthdr.len = len;
1415                 m->m_pkthdr.rcvif = NULL;
1416                 m->m_len = len;
1417                 MH_ALIGN(m, m->m_len);
1418                 m->m_flags |= M_MCAST;
1419                 ip6 = mtod(m, struct ip6_hdr *);
1420                 bzero(ip6, sizeof(*ip6));
1421                 ip6->ip6_vfc |= IPV6_VERSION;
1422                 ip6->ip6_hlim = CARP_DFLTTL;
1423                 ip6->ip6_nxt = IPPROTO_CARP;
1424                 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src,
1425                     sizeof(struct in6_addr));
1426                 /* set the multicast destination */
1427
1428                 ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
1429                 ip6->ip6_dst.s6_addr8[15] = 0x12;
1430                 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
1431                         IFNET_STAT_INC(cifp, oerrors, 1);
1432                         m_freem(m);
1433                         CARP_LOG("%s: in6_setscope failed\n", __func__);
1434                         return;
1435                 }
1436
1437                 ch_ptr = (struct carp_header *)(&ip6[1]);
1438                 bcopy(&ch, ch_ptr, sizeof(ch));
1439                 carp_prepare_ad(sc, ch_ptr);
1440                 ch_ptr->carp_cksum = in_cksum_skip(m, len, sizeof(*ip6));
1441
1442                 getmicrotime(&cifp->if_lastchange);
1443                 IFNET_STAT_INC(cifp, opackets, 1);
1444                 IFNET_STAT_INC(cifp, obytes, len);
1445                 carpstats.carps_opackets6++;
1446
1447                 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) {
1448                         IFNET_STAT_INC(cifp, oerrors, 1);
1449                         if (sc->sc_sendad_errors < INT_MAX)
1450                                 sc->sc_sendad_errors++;
1451                         if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1452                                 carp_suppress_preempt++;
1453                                 if (carp_suppress_preempt == 1) {
1454                                         carp_send_ad_all();
1455                                 }
1456                         }
1457                         sc->sc_sendad_success = 0;
1458                 } else {
1459                         if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1460                                 if (++sc->sc_sendad_success >=
1461                                     CARP_SENDAD_MIN_SUCCESS) {
1462                                         carp_suppress_preempt--;
1463                                         sc->sc_sendad_errors = 0;
1464                                 }
1465                         } else {
1466                                 sc->sc_sendad_errors = 0;
1467                         }
1468                 }
1469         }
1470 #endif /* INET6 */
1471
1472         if (advbase != 255 || advskew != 255)
1473                 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1474                     carp_send_ad_timeout, sc);
1475 }
1476
1477 /*
1478  * Broadcast a gratuitous ARP request containing
1479  * the virtual router MAC address for each IP address
1480  * associated with the virtual router.
1481  */
1482 static void
1483 carp_send_arp(struct carp_softc *sc)
1484 {
1485         const struct carp_vhaddr *vha;
1486
1487         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1488                 if (vha->vha_iaback == NULL)
1489                         continue;
1490                 arp_gratuitous(&sc->sc_if, &vha->vha_ia->ia_ifa);
1491         }
1492 }
1493
1494 #ifdef INET6
1495 static void
1496 carp_send_na(struct carp_softc *sc)
1497 {
1498         struct ifaddr_container *ifac;
1499         struct in6_addr *in6;
1500         static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1501
1502         TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
1503                 struct ifaddr *ifa = ifac->ifa;
1504
1505                 if (ifa->ifa_addr->sa_family != AF_INET6)
1506                         continue;
1507
1508                 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
1509                 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1510                     ND_NA_FLAG_OVERRIDE, 1, NULL);
1511                 DELAY(1000);    /* XXX */
1512         }
1513 }
1514 #endif /* INET6 */
1515
1516 static __inline const struct carp_vhaddr *
1517 carp_find_addr(const struct carp_softc *sc, const struct in_addr *addr)
1518 {
1519         struct carp_vhaddr *vha;
1520
1521         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1522                 if (vha->vha_iaback == NULL)
1523                         continue;
1524
1525                 if (vha->vha_ia->ia_addr.sin_addr.s_addr == addr->s_addr)
1526                         return vha;
1527         }
1528         return NULL;
1529 }
1530
1531 #ifdef notyet
1532 static int
1533 carp_iamatch_balance(const struct carp_if *cif, const struct in_addr *itaddr,
1534                      const struct in_addr *isaddr, uint8_t **enaddr)
1535 {
1536         const struct carp_softc *vh;
1537         int index, count = 0;
1538
1539         /*
1540          * XXX proof of concept implementation.
1541          * We use the source ip to decide which virtual host should
1542          * handle the request. If we're master of that virtual host,
1543          * then we respond, otherwise, just drop the arp packet on
1544          * the floor.
1545          */
1546
1547         TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1548                 if (!CARP_IS_RUNNING(&vh->sc_if))
1549                         continue;
1550
1551                 if (carp_find_addr(vh, itaddr) != NULL)
1552                         count++;
1553         }
1554         if (count == 0)
1555                 return 0;
1556
1557         /* this should be a hash, like pf_hash() */
1558         index = ntohl(isaddr->s_addr) % count;
1559         count = 0;
1560
1561         TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1562                 if (!CARP_IS_RUNNING(&vh->sc_if))
1563                         continue;
1564
1565                 if (carp_find_addr(vh, itaddr) == NULL)
1566                         continue;
1567
1568                 if (count == index) {
1569                         if (vh->sc_state == MASTER) {
1570                                 *enaddr = IF_LLADDR(&vh->sc_if);
1571                                 return 1;
1572                         } else {
1573                                 return 0;
1574                         }
1575                 }
1576                 count++;
1577         }
1578         return 0;
1579 }
1580 #endif
1581
1582 int
1583 carp_iamatch(const struct in_ifaddr *ia)
1584 {
1585         const struct carp_softc *sc = ia->ia_ifp->if_softc;
1586
1587         KASSERT(&curthread->td_msgport == netisr_cpuport(0),
1588             ("not in netisr0"));
1589
1590 #ifdef notyet
1591         if (carp_opts[CARPCTL_ARPBALANCE])
1592                 return carp_iamatch_balance(cif, itaddr, isaddr, enaddr);
1593 #endif
1594
1595         if (!CARP_IS_RUNNING(&sc->sc_if) || sc->sc_state != MASTER)
1596                 return 0;
1597
1598         return 1;
1599 }
1600
1601 #ifdef INET6
1602 struct ifaddr *
1603 carp_iamatch6(void *v, struct in6_addr *taddr)
1604 {
1605 #ifdef foo
1606         struct carp_if *cif = v;
1607         struct carp_softc *vh;
1608
1609         TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1610                 struct ifaddr_container *ifac;
1611
1612                 TAILQ_FOREACH(ifac, &vh->sc_if.if_addrheads[mycpuid],
1613                               ifa_link) {
1614                         struct ifaddr *ifa = ifac->ifa;
1615
1616                         if (IN6_ARE_ADDR_EQUAL(taddr,
1617                             &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1618                             CARP_IS_RUNNING(&vh->sc_if) &&
1619                             vh->sc_state == MASTER) {
1620                                 return (ifa);
1621                         }
1622                 }
1623         }
1624 #endif
1625         return (NULL);
1626 }
1627
1628 void *
1629 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr)
1630 {
1631 #ifdef foo
1632         struct m_tag *mtag;
1633         struct carp_if *cif = v;
1634         struct carp_softc *sc;
1635
1636         TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
1637                 struct ifaddr_container *ifac;
1638
1639                 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid],
1640                               ifa_link) {
1641                         struct ifaddr *ifa = ifac->ifa;
1642
1643                         if (IN6_ARE_ADDR_EQUAL(taddr,
1644                             &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1645                             CARP_IS_RUNNING(&sc->sc_if)) {
1646                                 struct ifnet *ifp = &sc->sc_if;
1647
1648                                 mtag = m_tag_get(PACKET_TAG_CARP,
1649                                     sizeof(struct ifnet *), MB_DONTWAIT);
1650                                 if (mtag == NULL) {
1651                                         /* better a bit than nothing */
1652                                         return (IF_LLADDR(ifp));
1653                                 }
1654                                 bcopy(&ifp, (caddr_t)(mtag + 1),
1655                                     sizeof(struct ifnet *));
1656                                 m_tag_prepend(m, mtag);
1657
1658                                 return (IF_LLADDR(ifp));
1659                         }
1660                 }
1661         }
1662 #endif
1663         return (NULL);
1664 }
1665 #endif
1666
1667 static struct ifnet *
1668 carp_forus(struct carp_if *cif, const uint8_t *dhost)
1669 {
1670         struct carp_softc_container *scc;
1671
1672         if (memcmp(dhost, carp_etheraddr, ETHER_ADDR_LEN - 1) != 0)
1673                 return NULL;
1674
1675         TAILQ_FOREACH(scc, cif, scc_link) {
1676                 struct carp_softc *sc = scc->scc_softc;
1677                 struct ifnet *ifp = &sc->sc_if;
1678
1679                 if (CARP_IS_RUNNING(ifp) && sc->sc_state == MASTER &&
1680                     !bcmp(dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN))
1681                         return ifp;
1682         }
1683         return NULL;
1684 }
1685
1686 static void
1687 carp_master_down_timeout(void *xsc)
1688 {
1689         struct carp_softc *sc = xsc;
1690         struct netmsg_carp *cmsg = &sc->sc_md_msg;
1691
1692         KASSERT(mycpuid == 0, ("%s not on cpu0 but on cpu%d",
1693             __func__, mycpuid));
1694
1695         crit_enter();
1696         if (cmsg->base.lmsg.ms_flags & MSGF_DONE)
1697                 lwkt_sendmsg(netisr_cpuport(0), &cmsg->base.lmsg);
1698         crit_exit();
1699 }
1700
1701 static void
1702 carp_master_down_timeout_dispatch(netmsg_t msg)
1703 {
1704         struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
1705         struct carp_softc *sc = cmsg->nc_softc;
1706
1707         /* Reply ASAP */
1708         crit_enter();
1709         lwkt_replymsg(&cmsg->base.lmsg, 0);
1710         crit_exit();
1711
1712         CARP_DEBUG("%s: BACKUP -> MASTER (master timed out)\n",
1713                    sc->sc_if.if_xname);
1714         carp_master_down(sc);
1715 }
1716
1717 static void
1718 carp_master_down(struct carp_softc *sc)
1719 {
1720         switch (sc->sc_state) {
1721         case INIT:
1722                 kprintf("%s: master_down event in INIT state\n",
1723                         sc->sc_if.if_xname);
1724                 break;
1725
1726         case MASTER:
1727                 break;
1728
1729         case BACKUP:
1730                 carp_set_state(sc, MASTER);
1731                 carp_send_ad(sc);
1732                 carp_send_arp(sc);
1733 #ifdef INET6
1734                 carp_send_na(sc);
1735 #endif /* INET6 */
1736                 carp_setrun(sc, 0);
1737                 carp_setroute(sc, RTM_ADD);
1738                 break;
1739         }
1740 }
1741
1742 /*
1743  * When in backup state, af indicates whether to reset the master down timer
1744  * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1745  */
1746 static void
1747 carp_setrun(struct carp_softc *sc, sa_family_t af)
1748 {
1749         struct ifnet *cifp = &sc->sc_if;
1750         struct timeval tv;
1751
1752         if (sc->sc_carpdev == NULL) {
1753                 carp_set_state(sc, INIT);
1754                 return;
1755         }
1756
1757         if ((cifp->if_flags & IFF_RUNNING) && sc->sc_vhid > 0 &&
1758             (sc->sc_naddrs || sc->sc_naddrs6)) {
1759                 /* Nothing */
1760         } else {
1761                 carp_setroute(sc, RTM_DELETE);
1762                 return;
1763         }
1764
1765         switch (sc->sc_state) {
1766         case INIT:
1767                 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) {
1768                         carp_send_ad(sc);
1769                         carp_send_arp(sc);
1770 #ifdef INET6
1771                         carp_send_na(sc);
1772 #endif /* INET6 */
1773                         CARP_DEBUG("%s: INIT -> MASTER (preempting)\n",
1774                                    cifp->if_xname);
1775                         carp_set_state(sc, MASTER);
1776                         carp_setroute(sc, RTM_ADD);
1777                 } else {
1778                         CARP_DEBUG("%s: INIT -> BACKUP\n", cifp->if_xname);
1779                         carp_set_state(sc, BACKUP);
1780                         carp_setroute(sc, RTM_DELETE);
1781                         carp_setrun(sc, 0);
1782                 }
1783                 break;
1784
1785         case BACKUP:
1786                 callout_stop(&sc->sc_ad_tmo);
1787                 tv.tv_sec = 3 * sc->sc_advbase;
1788                 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1789                 switch (af) {
1790 #ifdef INET
1791                 case AF_INET:
1792                         callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
1793                             carp_master_down_timeout, sc);
1794                         break;
1795 #endif /* INET */
1796 #ifdef INET6
1797                 case AF_INET6:
1798                         callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
1799                             carp_master_down_timeout, sc);
1800                         break;
1801 #endif /* INET6 */
1802                 default:
1803                         if (sc->sc_naddrs)
1804                                 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
1805                                     carp_master_down_timeout, sc);
1806                         if (sc->sc_naddrs6)
1807                                 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
1808                                     carp_master_down_timeout, sc);
1809                         break;
1810                 }
1811                 break;
1812
1813         case MASTER:
1814                 tv.tv_sec = sc->sc_advbase;
1815                 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1816                 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1817                     carp_send_ad_timeout, sc);
1818                 break;
1819         }
1820 }
1821
1822 static void
1823 carp_multicast_cleanup(struct carp_softc *sc)
1824 {
1825         struct ip_moptions *imo = &sc->sc_imo;
1826
1827         if (imo->imo_num_memberships == 0)
1828                 return;
1829         KKASSERT(imo->imo_num_memberships == 1);
1830
1831         in_delmulti(imo->imo_membership[0]);
1832         imo->imo_membership[0] = NULL;
1833         imo->imo_num_memberships = 0;
1834         imo->imo_multicast_ifp = NULL;
1835 }
1836
1837 #ifdef INET6
1838 static void
1839 carp_multicast6_cleanup(struct carp_softc *sc)
1840 {
1841         struct ip6_moptions *im6o = &sc->sc_im6o;
1842
1843         while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1844                 struct in6_multi_mship *imm =
1845                     LIST_FIRST(&im6o->im6o_memberships);
1846
1847                 LIST_REMOVE(imm, i6mm_chain);
1848                 in6_leavegroup(imm);
1849         }
1850         im6o->im6o_multicast_ifp = NULL;
1851 }
1852 #endif
1853
1854 static void
1855 carp_ioctl_getvhaddr_dispatch(netmsg_t msg)
1856 {
1857         struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
1858         struct carp_softc *sc = cmsg->nc_softc;
1859         const struct carp_vhaddr *vha;
1860         struct ifcarpvhaddr *carpa, *carpa0;
1861         int count, len, error = 0;
1862
1863         count = 0;
1864         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
1865                 ++count;
1866
1867         if (cmsg->nc_datalen == 0) {
1868                 cmsg->nc_datalen = count * sizeof(*carpa);
1869                 goto back;
1870         } else if (count == 0 || cmsg->nc_datalen < sizeof(*carpa)) {
1871                 cmsg->nc_datalen = 0;
1872                 goto back;
1873         }
1874         len = min(cmsg->nc_datalen, sizeof(*carpa) * count);
1875         KKASSERT(len >= sizeof(*carpa));
1876
1877         carpa0 = carpa = kmalloc(len, M_TEMP, M_WAITOK | M_NULLOK | M_ZERO);
1878         if (carpa == NULL) {
1879                 error = ENOMEM;
1880                 goto back;
1881         }
1882
1883         count = 0;
1884         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1885                 if (len < sizeof(*carpa))
1886                         break;
1887
1888                 carpa->carpa_flags = vha->vha_flags;
1889                 carpa->carpa_addr.sin_family = AF_INET;
1890                 carpa->carpa_addr.sin_addr = vha->vha_ia->ia_addr.sin_addr;
1891
1892                 carpa->carpa_baddr.sin_family = AF_INET;
1893                 if (vha->vha_iaback == NULL) {
1894                         carpa->carpa_baddr.sin_addr.s_addr = INADDR_ANY;
1895                 } else {
1896                         carpa->carpa_baddr.sin_addr =
1897                         vha->vha_iaback->ia_addr.sin_addr;
1898                 }
1899
1900                 ++carpa;
1901                 ++count;
1902                 len -= sizeof(*carpa);
1903         }
1904         cmsg->nc_datalen = sizeof(*carpa) * count;
1905         KKASSERT(cmsg->nc_datalen > 0);
1906
1907         cmsg->nc_data = carpa0;
1908
1909 back:
1910         lwkt_replymsg(&cmsg->base.lmsg, error);
1911 }
1912
1913 static int
1914 carp_ioctl_getvhaddr(struct carp_softc *sc, struct ifdrv *ifd)
1915 {
1916         struct ifnet *ifp = &sc->arpcom.ac_if;
1917         struct netmsg_carp cmsg;
1918         int error;
1919
1920         ASSERT_IFNET_SERIALIZED_ALL(ifp);
1921         ifnet_deserialize_all(ifp);
1922
1923         bzero(&cmsg, sizeof(cmsg));
1924         netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
1925             carp_ioctl_getvhaddr_dispatch);
1926         cmsg.nc_softc = sc;
1927         cmsg.nc_datalen = ifd->ifd_len;
1928
1929         error = lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
1930
1931         if (!error) {
1932                 if (cmsg.nc_data != NULL) {
1933                         error = copyout(cmsg.nc_data, ifd->ifd_data,
1934                             cmsg.nc_datalen);
1935                         kfree(cmsg.nc_data, M_TEMP);
1936                 }
1937                 ifd->ifd_len = cmsg.nc_datalen;
1938         } else {
1939                 KASSERT(cmsg.nc_data == NULL,
1940                     ("%s temp vhaddr is alloc upon error", __func__));
1941         }
1942
1943         ifnet_serialize_all(ifp);
1944         return error;
1945 }
1946
1947 static int
1948 carp_config_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
1949     struct in_ifaddr *ia_del)
1950 {
1951         struct ifnet *ifp;
1952         struct in_ifaddr *ia_if;
1953         const struct in_ifaddr *ia_vha;
1954         struct in_ifaddr_container *iac;
1955         int own, ia_match_carpdev;
1956
1957         KKASSERT(vha->vha_ia != NULL);
1958         ia_vha = vha->vha_ia;
1959
1960         ia_if = NULL;
1961         own = 0;
1962         ia_match_carpdev = 0;
1963         TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1964                 struct in_ifaddr *ia = iac->ia;
1965
1966                 if (ia == ia_del)
1967                         continue;
1968
1969                 if (ia->ia_ifp->if_type == IFT_CARP)
1970                         continue;
1971
1972                 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
1973                         continue;
1974
1975                 /* and, yeah, we need a multicast-capable iface too */
1976                 if ((ia->ia_ifp->if_flags & IFF_MULTICAST) == 0)
1977                         continue;
1978
1979                 if (ia_vha->ia_subnetmask == ia->ia_subnetmask &&
1980                     ia_vha->ia_subnet == ia->ia_subnet) {
1981                         if (ia_vha->ia_addr.sin_addr.s_addr ==
1982                             ia->ia_addr.sin_addr.s_addr)
1983                                 own = 1;
1984                         if (ia_if == NULL) {
1985                                 ia_if = ia;
1986                         } else if (sc->sc_carpdev != NULL &&
1987                             sc->sc_carpdev == ia->ia_ifp) {
1988                                 ia_if = ia;
1989                                 if (ia_if->ia_flags & IFA_ROUTE) {
1990                                         /*
1991                                          * Address with prefix route
1992                                          * is prefered
1993                                          */
1994                                         break;
1995                                 }
1996                                 ia_match_carpdev = 1;
1997                         } else if (!ia_match_carpdev) {
1998                                 if (ia->ia_flags & IFA_ROUTE) {
1999                                         /*
2000                                          * Address with prefix route
2001                                          * is prefered over others.
2002                                          */
2003                                         ia_if = ia;
2004                                 }
2005                         }
2006                 }
2007         }
2008
2009         carp_deactivate_vhaddr(sc, vha, FALSE);
2010         if (!ia_if)
2011                 return ENOENT;
2012
2013         ifp = ia_if->ia_ifp;
2014
2015         /* XXX Don't allow parent iface to be changed */
2016         if (sc->sc_carpdev != NULL && sc->sc_carpdev != ifp)
2017                 return EEXIST;
2018
2019         return carp_activate_vhaddr(sc, vha, ifp, ia_if, own);
2020 }
2021
2022 static void
2023 carp_add_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
2024 {
2025         struct carp_vhaddr *vha_new;
2026         struct in_ifaddr *carp_ia;
2027 #ifdef INVARIANTS
2028         struct carp_vhaddr *vha;
2029 #endif
2030
2031         KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
2032         carp_ia = ifatoia(carp_ifa);
2033
2034 #ifdef INVARIANTS
2035         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
2036                 KKASSERT(vha->vha_ia != NULL && vha->vha_ia != carp_ia);
2037 #endif
2038
2039         vha_new = kmalloc(sizeof(*vha_new), M_CARP, M_WAITOK | M_ZERO);
2040         vha_new->vha_ia = carp_ia;
2041         carp_insert_vhaddr(sc, vha_new);
2042
2043         if (carp_config_vhaddr(sc, vha_new, NULL) != 0) {
2044                 /*
2045                  * If the above configuration fails, it may only mean
2046                  * that the new address is problematic.  However, the
2047                  * carp(4) interface may already have several working
2048                  * addresses.  Since the expected behaviour of
2049                  * SIOC[AS]IFADDR is to put the NIC into working state,
2050                  * we try starting the state machine manually here with
2051                  * the hope that the carp(4)'s previously working
2052                  * addresses still could be brought up.
2053                  */
2054                 carp_hmac_prepare(sc);
2055                 carp_set_state(sc, INIT);
2056                 carp_setrun(sc, 0);
2057         }
2058 }
2059
2060 static void
2061 carp_del_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
2062 {
2063         struct carp_vhaddr *vha;
2064         struct in_ifaddr *carp_ia;
2065
2066         KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
2067         carp_ia = ifatoia(carp_ifa);
2068
2069         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
2070                 KKASSERT(vha->vha_ia != NULL);
2071                 if (vha->vha_ia == carp_ia)
2072                         break;
2073         }
2074         KASSERT(vha != NULL, ("no corresponding vhaddr %p", carp_ifa));
2075
2076         /*
2077          * Remove the vhaddr from the list before deactivating
2078          * the vhaddr, so that the HMAC could be correctly
2079          * updated in carp_deactivate_vhaddr()
2080          */
2081         carp_remove_vhaddr(sc, vha);
2082
2083         carp_deactivate_vhaddr(sc, vha, FALSE);
2084         kfree(vha, M_CARP);
2085 }
2086
2087 static void
2088 carp_config_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
2089 {
2090         struct carp_vhaddr *vha;
2091         struct in_ifaddr *carp_ia;
2092
2093         KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
2094         carp_ia = ifatoia(carp_ifa);
2095
2096         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
2097                 KKASSERT(vha->vha_ia != NULL);
2098                 if (vha->vha_ia == carp_ia)
2099                         break;
2100         }
2101         KASSERT(vha != NULL, ("no corresponding vhaddr %p", carp_ifa));
2102
2103         /* Remove then reinsert, to keep the vhaddr list sorted */
2104         carp_remove_vhaddr(sc, vha);
2105         carp_insert_vhaddr(sc, vha);
2106
2107         if (carp_config_vhaddr(sc, vha, NULL) != 0) {
2108                 /* See the comment in carp_add_addr() */
2109                 carp_hmac_prepare(sc);
2110                 carp_set_state(sc, INIT);
2111                 carp_setrun(sc, 0);
2112         }
2113 }
2114
2115 #ifdef notyet
2116
2117 #ifdef INET6
2118 static int
2119 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
2120 {
2121         struct ifnet *ifp;
2122         struct carp_if *cif;
2123         struct in6_ifaddr *ia, *ia_if;
2124         struct ip6_moptions *im6o = &sc->sc_im6o;
2125         struct in6_multi_mship *imm;
2126         struct in6_addr in6;
2127         int own, error;
2128
2129         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
2130                 carp_setrun(sc, 0);
2131                 return (0);
2132         }
2133
2134         /* we have to do it by hands to check we won't match on us */
2135         ia_if = NULL; own = 0;
2136         for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
2137                 int i;
2138
2139                 for (i = 0; i < 4; i++) {
2140                         if ((sin6->sin6_addr.s6_addr32[i] &
2141                             ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
2142                             (ia->ia_addr.sin6_addr.s6_addr32[i] &
2143                             ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
2144                                 break;
2145                 }
2146                 /* and, yeah, we need a multicast-capable iface too */
2147                 if (ia->ia_ifp != &sc->sc_if &&
2148                     (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
2149                     (i == 4)) {
2150                         if (!ia_if)
2151                                 ia_if = ia;
2152                         if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2153                             &ia->ia_addr.sin6_addr))
2154                                 own++;
2155                 }
2156         }
2157
2158         if (!ia_if)
2159                 return (EADDRNOTAVAIL);
2160         ia = ia_if;
2161         ifp = ia->ia_ifp;
2162
2163         if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
2164             (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp))
2165                 return (EADDRNOTAVAIL);
2166
2167         if (!sc->sc_naddrs6) {
2168                 im6o->im6o_multicast_ifp = ifp;
2169
2170                 /* join CARP multicast address */
2171                 bzero(&in6, sizeof(in6));
2172                 in6.s6_addr16[0] = htons(0xff02);
2173                 in6.s6_addr8[15] = 0x12;
2174                 if (in6_setscope(&in6, ifp, NULL) != 0)
2175                         goto cleanup;
2176                 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
2177                         goto cleanup;
2178                 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
2179
2180                 /* join solicited multicast address */
2181                 bzero(&in6, sizeof(in6));
2182                 in6.s6_addr16[0] = htons(0xff02);
2183                 in6.s6_addr32[1] = 0;
2184                 in6.s6_addr32[2] = htonl(1);
2185                 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3];
2186                 in6.s6_addr8[12] = 0xff;
2187                 if (in6_setscope(&in6, ifp, NULL) != 0)
2188                         goto cleanup;
2189                 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
2190                         goto cleanup;
2191                 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
2192         }
2193
2194 #ifdef foo
2195         if (!ifp->if_carp) {
2196                 cif = kmalloc(sizeof(*cif), M_CARP, M_WAITOK | M_ZERO);
2197
2198                 if ((error = ifpromisc(ifp, 1))) {
2199                         kfree(cif, M_CARP);
2200                         goto cleanup;
2201                 }
2202
2203                 TAILQ_INIT(&cif->vhif_vrs);
2204                 ifp->if_carp = cif;
2205         } else {
2206                 struct carp_softc *vr;
2207
2208                 cif = ifp->if_carp;
2209                 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
2210                         if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
2211                                 error = EINVAL;
2212                                 goto cleanup;
2213                         }
2214                 }
2215         }
2216 #endif
2217         sc->sc_ia6 = ia;
2218         sc->sc_carpdev = ifp;
2219
2220 #ifdef foo
2221         { /* XXX prevent endless loop if already in queue */
2222         struct carp_softc *vr, *after = NULL;
2223         int myself = 0;
2224         cif = ifp->if_carp;
2225
2226         TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
2227                 if (vr == sc)
2228                         myself = 1;
2229                 if (vr->sc_vhid < sc->sc_vhid)
2230                         after = vr;
2231         }
2232
2233         if (!myself) {
2234                 /* We're trying to keep things in order */
2235                 if (after == NULL)
2236                         TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
2237                 else
2238                         TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
2239         }
2240         }
2241 #endif
2242
2243         sc->sc_naddrs6++;
2244         if (own)
2245                 sc->sc_advskew = 0;
2246         carp_sc_state(sc);
2247         carp_setrun(sc, 0);
2248
2249         return (0);
2250
2251 cleanup:
2252         /* clean up multicast memberships */
2253         if (!sc->sc_naddrs6) {
2254                 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
2255                         imm = LIST_FIRST(&im6o->im6o_memberships);
2256                         LIST_REMOVE(imm, i6mm_chain);
2257                         in6_leavegroup(imm);
2258                 }
2259         }
2260         return (error);
2261 }
2262
2263 static int
2264 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
2265 {
2266         int error = 0;
2267
2268         if (!--sc->sc_naddrs6) {
2269                 struct carp_if *cif = sc->sc_carpdev->if_carp;
2270                 struct ip6_moptions *im6o = &sc->sc_im6o;
2271
2272                 callout_stop(&sc->sc_ad_tmo);
2273                 sc->sc_vhid = -1;
2274                 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
2275                         struct in6_multi_mship *imm =
2276                             LIST_FIRST(&im6o->im6o_memberships);
2277
2278                         LIST_REMOVE(imm, i6mm_chain);
2279                         in6_leavegroup(imm);
2280                 }
2281                 im6o->im6o_multicast_ifp = NULL;
2282 #ifdef foo
2283                 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
2284                 if (TAILQ_EMPTY(&cif->vhif_vrs)) {
2285                         sc->sc_carpdev->if_carp = NULL;
2286                         kfree(cif, M_IFADDR);
2287                 }
2288 #endif
2289         }
2290         return (error);
2291 }
2292 #endif /* INET6 */
2293
2294 #endif
2295
2296 static int
2297 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr, struct ucred *cr)
2298 {
2299         struct carp_softc *sc = ifp->if_softc;
2300         struct ifreq *ifr = (struct ifreq *)addr;
2301         struct ifdrv *ifd = (struct ifdrv *)addr;
2302         int error = 0;
2303
2304         ASSERT_IFNET_SERIALIZED_ALL(ifp);
2305
2306         switch (cmd) {
2307         case SIOCSIFFLAGS:
2308                 if (ifp->if_flags & IFF_UP) {
2309                         if ((ifp->if_flags & IFF_RUNNING) == 0)
2310                                 carp_init(sc);
2311                 } else if (ifp->if_flags & IFF_RUNNING) {
2312                         carp_ioctl_stop(sc);
2313                 }
2314                 break;
2315
2316         case SIOCSVH:
2317                 error = carp_ioctl_setvh(sc, ifr->ifr_data, cr);
2318                 break;
2319
2320         case SIOCGVH:
2321                 error = carp_ioctl_getvh(sc, ifr->ifr_data, cr);
2322                 break;
2323
2324         case SIOCGDRVSPEC:
2325                 switch (ifd->ifd_cmd) {
2326                 case CARPGDEVNAME:
2327                         error = carp_ioctl_getdevname(sc, ifd);
2328                         break;
2329
2330                 case CARPGVHADDR:
2331                         error = carp_ioctl_getvhaddr(sc, ifd);
2332                         break;
2333
2334                 default:
2335                         error = EINVAL;
2336                         break;
2337                 }
2338                 break;
2339
2340         default:
2341                 error = ether_ioctl(ifp, cmd, addr);
2342                 break;
2343         }
2344
2345         return error;
2346 }
2347
2348 static void
2349 carp_ioctl_stop_dispatch(netmsg_t msg)
2350 {
2351         struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2352         struct carp_softc *sc = cmsg->nc_softc;
2353
2354         carp_stop(sc, FALSE);
2355         lwkt_replymsg(&cmsg->base.lmsg, 0);
2356 }
2357
2358 static void
2359 carp_ioctl_stop(struct carp_softc *sc)
2360 {
2361         struct ifnet *ifp = &sc->arpcom.ac_if;
2362         struct netmsg_carp cmsg;
2363
2364         ASSERT_IFNET_SERIALIZED_ALL(ifp);
2365
2366         ifnet_deserialize_all(ifp);
2367
2368         bzero(&cmsg, sizeof(cmsg));
2369         netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2370             carp_ioctl_stop_dispatch);
2371         cmsg.nc_softc = sc;
2372
2373         lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2374
2375         ifnet_serialize_all(ifp);
2376 }
2377
2378 static void
2379 carp_ioctl_setvh_dispatch(netmsg_t msg)
2380 {
2381         struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2382         struct carp_softc *sc = cmsg->nc_softc;
2383         struct ifnet *ifp = &sc->arpcom.ac_if;
2384         const struct carpreq *carpr = cmsg->nc_data;
2385         int error;
2386
2387         error = 1;
2388         if ((ifp->if_flags & IFF_RUNNING) &&
2389             sc->sc_state != INIT && carpr->carpr_state != sc->sc_state) {
2390                 switch (carpr->carpr_state) {
2391                 case BACKUP:
2392                         callout_stop(&sc->sc_ad_tmo);
2393                         carp_set_state(sc, BACKUP);
2394                         carp_setrun(sc, 0);
2395                         carp_setroute(sc, RTM_DELETE);
2396                         break;
2397
2398                 case MASTER:
2399                         carp_master_down(sc);
2400                         break;
2401
2402                 default:
2403                         break;
2404                 }
2405         }
2406         if (carpr->carpr_vhid > 0) {
2407                 if (carpr->carpr_vhid > 255) {
2408                         error = EINVAL;
2409                         goto back;
2410                 }
2411                 if (sc->sc_carpdev) {
2412                         struct carp_if *cif = sc->sc_carpdev->if_carp;
2413                         struct carp_softc_container *scc;
2414
2415                         TAILQ_FOREACH(scc, cif, scc_link) {
2416                                 struct carp_softc *vr = scc->scc_softc;
2417
2418                                 if (vr != sc &&
2419                                     vr->sc_vhid == carpr->carpr_vhid) {
2420                                         error = EEXIST;
2421                                         goto back;
2422                                 }
2423                         }
2424                 }
2425                 sc->sc_vhid = carpr->carpr_vhid;
2426
2427                 IF_LLADDR(ifp)[5] = sc->sc_vhid;
2428                 bcopy(IF_LLADDR(ifp), sc->arpcom.ac_enaddr,
2429                     ETHER_ADDR_LEN);
2430
2431                 error--;
2432         }
2433         if (carpr->carpr_advbase > 0 || carpr->carpr_advskew > 0) {
2434                 if (carpr->carpr_advskew >= 255) {
2435                         error = EINVAL;
2436                         goto back;
2437                 }
2438                 if (carpr->carpr_advbase > 255) {
2439                         error = EINVAL;
2440                         goto back;
2441                 }
2442                 sc->sc_advbase = carpr->carpr_advbase;
2443                 sc->sc_advskew = carpr->carpr_advskew;
2444                 error--;
2445         }
2446         bcopy(carpr->carpr_key, sc->sc_key, sizeof(sc->sc_key));
2447         if (error > 0) {
2448                 error = EINVAL;
2449         } else {
2450                 error = 0;
2451                 carp_setrun(sc, 0);
2452         }
2453 back:
2454         carp_hmac_prepare(sc);
2455
2456         lwkt_replymsg(&cmsg->base.lmsg, error);
2457 }
2458
2459 static int
2460 carp_ioctl_setvh(struct carp_softc *sc, void *udata, struct ucred *cr)
2461 {
2462         struct ifnet *ifp = &sc->arpcom.ac_if;
2463         struct netmsg_carp cmsg;
2464         struct carpreq carpr;
2465         int error;
2466
2467         ASSERT_IFNET_SERIALIZED_ALL(ifp);
2468         ifnet_deserialize_all(ifp);
2469
2470         error = priv_check_cred(cr, PRIV_ROOT, NULL_CRED_OKAY);
2471         if (error)
2472                 goto back;
2473
2474         error = copyin(udata, &carpr, sizeof(carpr));
2475         if (error)
2476                 goto back;
2477
2478         bzero(&cmsg, sizeof(cmsg));
2479         netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2480             carp_ioctl_setvh_dispatch);
2481         cmsg.nc_softc = sc;
2482         cmsg.nc_data = &carpr;
2483
2484         error = lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2485
2486 back:
2487         ifnet_serialize_all(ifp);
2488         return error;
2489 }
2490
2491 static void
2492 carp_ioctl_getvh_dispatch(netmsg_t msg)
2493 {
2494         struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2495         struct carp_softc *sc = cmsg->nc_softc;
2496         struct carpreq *carpr = cmsg->nc_data;
2497
2498         carpr->carpr_state = sc->sc_state;
2499         carpr->carpr_vhid = sc->sc_vhid;
2500         carpr->carpr_advbase = sc->sc_advbase;
2501         carpr->carpr_advskew = sc->sc_advskew;
2502         bcopy(sc->sc_key, carpr->carpr_key, sizeof(carpr->carpr_key));
2503
2504         lwkt_replymsg(&cmsg->base.lmsg, 0);
2505 }
2506
2507 static int
2508 carp_ioctl_getvh(struct carp_softc *sc, void *udata, struct ucred *cr)
2509 {
2510         struct ifnet *ifp = &sc->arpcom.ac_if;
2511         struct netmsg_carp cmsg;
2512         struct carpreq carpr;
2513         int error;
2514
2515         ASSERT_IFNET_SERIALIZED_ALL(ifp);
2516         ifnet_deserialize_all(ifp);
2517
2518         bzero(&cmsg, sizeof(cmsg));
2519         netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2520             carp_ioctl_getvh_dispatch);
2521         cmsg.nc_softc = sc;
2522         cmsg.nc_data = &carpr;
2523
2524         lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2525
2526         error = priv_check_cred(cr, PRIV_ROOT, NULL_CRED_OKAY);
2527         if (error)
2528                 bzero(carpr.carpr_key, sizeof(carpr.carpr_key));
2529
2530         error = copyout(&carpr, udata, sizeof(carpr));
2531
2532         ifnet_serialize_all(ifp);
2533         return error;
2534 }
2535
2536 static void
2537 carp_ioctl_getdevname_dispatch(netmsg_t msg)
2538 {
2539         struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2540         struct carp_softc *sc = cmsg->nc_softc;
2541         char *devname = cmsg->nc_data;
2542
2543         bzero(devname, IFNAMSIZ);
2544         if (sc->sc_carpdev != NULL)
2545                 strlcpy(devname, sc->sc_carpdev->if_xname, IFNAMSIZ);
2546
2547         lwkt_replymsg(&cmsg->base.lmsg, 0);
2548 }
2549
2550 static int
2551 carp_ioctl_getdevname(struct carp_softc *sc, struct ifdrv *ifd)
2552 {
2553         struct ifnet *ifp = &sc->arpcom.ac_if;
2554         struct netmsg_carp cmsg;
2555         char devname[IFNAMSIZ];
2556         int error;
2557
2558         ASSERT_IFNET_SERIALIZED_ALL(ifp);
2559
2560         if (ifd->ifd_len != sizeof(devname))
2561                 return EINVAL;
2562
2563         ifnet_deserialize_all(ifp);
2564
2565         bzero(&cmsg, sizeof(cmsg));
2566         netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2567             carp_ioctl_getdevname_dispatch);
2568         cmsg.nc_softc = sc;
2569         cmsg.nc_data = devname;
2570
2571         lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2572
2573         error = copyout(devname, ifd->ifd_data, sizeof(devname));
2574
2575         ifnet_serialize_all(ifp);
2576         return error;
2577 }
2578
2579 static void
2580 carp_init_dispatch(netmsg_t msg)
2581 {
2582         struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2583         struct carp_softc *sc = cmsg->nc_softc;
2584
2585         sc->sc_if.if_flags |= IFF_RUNNING;
2586         carp_hmac_prepare(sc);
2587         carp_set_state(sc, INIT);
2588         carp_setrun(sc, 0);
2589
2590         lwkt_replymsg(&cmsg->base.lmsg, 0);
2591 }
2592
2593 static void
2594 carp_init(void *xsc)
2595 {
2596         struct carp_softc *sc = xsc;
2597         struct ifnet *ifp = &sc->arpcom.ac_if;
2598         struct netmsg_carp cmsg;
2599
2600         ASSERT_IFNET_SERIALIZED_ALL(ifp);
2601
2602         ifnet_deserialize_all(ifp);
2603
2604         bzero(&cmsg, sizeof(cmsg));
2605         netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2606             carp_init_dispatch);
2607         cmsg.nc_softc = sc;
2608
2609         lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2610
2611         ifnet_serialize_all(ifp);
2612 }
2613
2614 static int
2615 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
2616     struct rtentry *rt)
2617 {
2618         struct carp_softc *sc = ifp->if_softc;
2619         struct ifnet *carpdev;
2620         int error = 0;
2621
2622         carpdev = sc->sc_carpdev;
2623         if (carpdev != NULL) {
2624                 /*
2625                  * NOTE:
2626                  * CARP's ifp is passed to backing device's
2627                  * if_output method.
2628                  */
2629                 carpdev->if_output(ifp, m, dst, rt);
2630         } else {
2631                 m_freem(m);
2632                 error = ENETUNREACH;
2633         }
2634         return error;
2635 }
2636
2637 /*
2638  * Start output on carp interface. This function should never be called.
2639  */
2640 static void
2641 carp_start(struct ifnet *ifp, struct ifaltq_subque *ifsq __unused)
2642 {
2643         panic("%s: start called", ifp->if_xname);
2644 }
2645
2646 static void
2647 carp_set_state(struct carp_softc *sc, int state)
2648 {
2649         struct ifnet *cifp = &sc->sc_if;
2650
2651         if (sc->sc_state == state)
2652                 return;
2653         sc->sc_state = state;
2654
2655         switch (sc->sc_state) {
2656         case BACKUP:
2657                 cifp->if_link_state = LINK_STATE_DOWN;
2658                 break;
2659
2660         case MASTER:
2661                 cifp->if_link_state = LINK_STATE_UP;
2662                 break;
2663
2664         default:
2665                 cifp->if_link_state = LINK_STATE_UNKNOWN;
2666                 break;
2667         }
2668         rt_ifmsg(cifp);
2669 }
2670
2671 void
2672 carp_group_demote_adj(struct ifnet *ifp, int adj)
2673 {
2674         struct ifg_list *ifgl;
2675         int *dm;
2676
2677         TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) {
2678                 if (!strcmp(ifgl->ifgl_group->ifg_group, IFG_ALL))
2679                         continue;
2680                 dm = &ifgl->ifgl_group->ifg_carp_demoted;
2681
2682                 if (*dm + adj >= 0)
2683                         *dm += adj;
2684                 else
2685                         *dm = 0;
2686
2687                 if (adj > 0 && *dm == 1)
2688                         carp_send_ad_all();
2689                 CARP_LOG("%s demoted group %s to %d", ifp->if_xname,
2690                     ifgl->ifgl_group->ifg_group, *dm);
2691         }
2692 }
2693
2694 #ifdef foo
2695 void
2696 carp_carpdev_state(void *v)
2697 {
2698         struct carp_if *cif = v;
2699         struct carp_softc *sc;
2700
2701         TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
2702                 carp_sc_state(sc);
2703 }
2704
2705 static void
2706 carp_sc_state(struct carp_softc *sc)
2707 {
2708         if (!(sc->sc_carpdev->if_flags & IFF_UP)) {
2709                 callout_stop(&sc->sc_ad_tmo);
2710                 callout_stop(&sc->sc_md_tmo);
2711                 callout_stop(&sc->sc_md6_tmo);
2712                 carp_set_state(sc, INIT);
2713                 carp_setrun(sc, 0);
2714                 if (!sc->sc_suppress) {
2715                         carp_suppress_preempt++;
2716                         if (carp_suppress_preempt == 1)
2717                                 carp_send_ad_all();
2718                 }
2719                 sc->sc_suppress = 1;
2720         } else {
2721                 carp_set_state(sc, INIT);
2722                 carp_setrun(sc, 0);
2723                 if (sc->sc_suppress)
2724                         carp_suppress_preempt--;
2725                 sc->sc_suppress = 0;
2726         }
2727 }
2728 #endif
2729
2730 static void
2731 carp_stop(struct carp_softc *sc, boolean_t detach)
2732 {
2733         sc->sc_if.if_flags &= ~IFF_RUNNING;
2734
2735         callout_stop(&sc->sc_ad_tmo);
2736         callout_stop(&sc->sc_md_tmo);
2737         callout_stop(&sc->sc_md6_tmo);
2738
2739         if (!detach && sc->sc_state == MASTER)
2740                 carp_send_ad(sc);
2741
2742         if (sc->sc_suppress)
2743                 carp_suppress_preempt--;
2744         sc->sc_suppress = 0;
2745
2746         if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
2747                 carp_suppress_preempt--;
2748         sc->sc_sendad_errors = 0;
2749         sc->sc_sendad_success = 0;
2750
2751         carp_set_state(sc, INIT);
2752         carp_setrun(sc, 0);
2753 }
2754
2755 static void
2756 carp_suspend(struct carp_softc *sc, boolean_t detach)
2757 {
2758         struct ifnet *cifp = &sc->sc_if;
2759
2760         carp_stop(sc, detach);
2761
2762         /* Retain the running state, if we are not dead yet */
2763         if (!sc->sc_dead && (cifp->if_flags & IFF_UP))
2764                 cifp->if_flags |= IFF_RUNNING;
2765 }
2766
2767 static int
2768 carp_activate_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
2769     struct ifnet *ifp, struct in_ifaddr *ia_if, int own)
2770 {
2771         struct ip_moptions *imo = &sc->sc_imo;
2772         struct carp_if *ocif = ifp->if_carp;
2773         int error;
2774
2775         KKASSERT(vha->vha_ia != NULL);
2776
2777         KASSERT(ia_if != NULL, ("NULL backing address"));
2778         KASSERT(vha->vha_iaback == NULL, ("%p is already activated", vha));
2779         KASSERT((vha->vha_flags & CARP_VHAF_OWNER) == 0,
2780                 ("inactive vhaddr %p is the address owner", vha));
2781
2782         KASSERT(sc->sc_carpdev == NULL || sc->sc_carpdev == ifp,
2783                 ("%s is already on %s", sc->sc_if.if_xname,
2784                  sc->sc_carpdev->if_xname));
2785
2786         if (ocif == NULL) {
2787                 KASSERT(sc->sc_carpdev == NULL,
2788                         ("%s is already on %s", sc->sc_if.if_xname,
2789                          sc->sc_carpdev->if_xname));
2790
2791                 error = ifpromisc(ifp, 1);
2792                 if (error)
2793                         return error;
2794         } else {
2795                 struct carp_softc_container *scc;
2796
2797                 TAILQ_FOREACH(scc, ocif, scc_link) {
2798                         struct carp_softc *vr = scc->scc_softc;
2799
2800                         if (vr != sc && vr->sc_vhid == sc->sc_vhid)
2801                                 return EINVAL;
2802                 }
2803         }
2804
2805         ifp->if_carp = carp_if_insert(ocif, sc);
2806         KASSERT(ifp->if_carp != NULL, ("%s carp_if_insert failed", __func__));
2807
2808         sc->sc_ia = ia_if;
2809         sc->sc_carpdev = ifp;
2810
2811         /*
2812          * Make sure that all protocol threads see the sc_carpdev and
2813          * if_carp changes
2814          */
2815         netmsg_service_sync();
2816
2817         if (ocif != NULL && ifp->if_carp != ocif) {
2818                 /*
2819                  * The old carp list could be safely free now,
2820                  * since no one can access it.
2821                  */
2822                 carp_if_free(ocif);
2823         }
2824
2825         vha->vha_iaback = ia_if;
2826         sc->sc_naddrs++;
2827
2828         if (own) {
2829                 vha->vha_flags |= CARP_VHAF_OWNER;
2830
2831                 /* XXX save user configured advskew? */
2832                 sc->sc_advskew = 0;
2833         }
2834
2835         carp_addroute_vhaddr(sc, vha);
2836
2837         /*
2838          * Join the multicast group only after the backing interface
2839          * has been hooked with the CARP interface.
2840          */
2841         KASSERT(imo->imo_multicast_ifp == NULL ||
2842                 imo->imo_multicast_ifp == &sc->sc_if,
2843                 ("%s didn't leave mcast group on %s",
2844                  sc->sc_if.if_xname, imo->imo_multicast_ifp->if_xname));
2845
2846         if (imo->imo_num_memberships == 0) {
2847                 struct in_addr addr;
2848
2849                 addr.s_addr = htonl(INADDR_CARP_GROUP);
2850                 imo->imo_membership[0] = in_addmulti(&addr, &sc->sc_if);
2851                 if (imo->imo_membership[0] == NULL) {
2852                         carp_deactivate_vhaddr(sc, vha, FALSE);
2853                         return ENOBUFS;
2854                 }
2855
2856                 imo->imo_num_memberships++;
2857                 imo->imo_multicast_ifp = &sc->sc_if;
2858                 imo->imo_multicast_ttl = CARP_DFLTTL;
2859                 imo->imo_multicast_loop = 0;
2860         }
2861
2862         carp_hmac_prepare(sc);
2863         carp_set_state(sc, INIT);
2864         carp_setrun(sc, 0);
2865         return 0;
2866 }
2867
2868 static void
2869 carp_deactivate_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
2870     boolean_t del_iaback)
2871 {
2872         KKASSERT(vha->vha_ia != NULL);
2873
2874         carp_hmac_prepare(sc);
2875
2876         if (vha->vha_iaback == NULL) {
2877                 KASSERT((vha->vha_flags & CARP_VHAF_OWNER) == 0,
2878                         ("inactive vhaddr %p is the address owner", vha));
2879                 return;
2880         }
2881
2882         vha->vha_flags &= ~CARP_VHAF_OWNER;
2883         carp_delroute_vhaddr(sc, vha, del_iaback);
2884
2885         KKASSERT(sc->sc_naddrs > 0);
2886         vha->vha_iaback = NULL;
2887         sc->sc_naddrs--;
2888         if (!sc->sc_naddrs) {
2889                 if (sc->sc_naddrs6) {
2890                         carp_multicast_cleanup(sc);
2891                         sc->sc_ia = NULL;
2892                 } else {
2893                         carp_detach(sc, FALSE, del_iaback);
2894                 }
2895         }
2896 }
2897
2898 static void
2899 carp_link_addrs(struct carp_softc *sc, struct ifnet *ifp, struct ifaddr *ifa_if)
2900 {
2901         struct carp_vhaddr *vha;
2902         struct in_ifaddr *ia_if;
2903
2904         KKASSERT(ifa_if->ifa_addr->sa_family == AF_INET);
2905         ia_if = ifatoia(ifa_if);
2906
2907         /*
2908          * Test each inactive vhaddr against the newly added address.
2909          * If the newly added address could be the backing address,
2910          * then activate the matching vhaddr.
2911          */
2912         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
2913                 const struct in_ifaddr *ia;
2914                 int own;
2915
2916                 if (vha->vha_iaback != NULL)
2917                         continue;
2918
2919                 ia = vha->vha_ia;
2920                 if (ia->ia_subnetmask != ia_if->ia_subnetmask ||
2921                     ia->ia_subnet != ia_if->ia_subnet)
2922                         continue;
2923
2924                 own = 0;
2925                 if (ia->ia_addr.sin_addr.s_addr ==
2926                     ia_if->ia_addr.sin_addr.s_addr)
2927                         own = 1;
2928
2929                 carp_activate_vhaddr(sc, vha, ifp, ia_if, own);
2930         }
2931 }
2932
2933 static void
2934 carp_unlink_addrs(struct carp_softc *sc, struct ifnet *ifp,
2935                   struct ifaddr *ifa_if)
2936 {
2937         struct carp_vhaddr *vha;
2938         struct in_ifaddr *ia_if;
2939
2940         KKASSERT(ifa_if->ifa_addr->sa_family == AF_INET);
2941         ia_if = ifatoia(ifa_if);
2942
2943         /*
2944          * Ad src address is deleted; set it to NULL.
2945          * Following loop will try pick up a new ad src address
2946          * if one of the vhaddr could retain its backing address.
2947          */
2948         if (sc->sc_ia == ia_if)
2949                 sc->sc_ia = NULL;
2950
2951         /*
2952          * Test each active vhaddr against the deleted address.
2953          * If the deleted address is vhaddr address's backing
2954          * address, then deactivate the vhaddr.
2955          */
2956         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
2957                 if (vha->vha_iaback == NULL)
2958                         continue;
2959
2960                 if (vha->vha_iaback == ia_if)
2961                         carp_deactivate_vhaddr(sc, vha, TRUE);
2962                 else if (sc->sc_ia == NULL)
2963                         sc->sc_ia = vha->vha_iaback;
2964         }
2965 }
2966
2967 static void
2968 carp_update_addrs(struct carp_softc *sc, struct ifaddr *ifa_del)
2969 {
2970         struct carp_vhaddr *vha;
2971
2972         KKASSERT(sc->sc_carpdev == NULL);
2973
2974         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
2975                 carp_config_vhaddr(sc, vha, ifatoia(ifa_del));
2976 }
2977
2978 static void
2979 carp_ifaddr(void *arg __unused, struct ifnet *ifp,
2980             enum ifaddr_event event, struct ifaddr *ifa)
2981 {
2982         struct carp_softc *sc;
2983
2984         if (ifa->ifa_addr->sa_family != AF_INET)
2985                 return;
2986
2987         KASSERT(&curthread->td_msgport == netisr_cpuport(0),
2988             ("not in netisr0"));
2989
2990         if (ifp->if_type == IFT_CARP) {
2991                 /*
2992                  * Address is changed on carp(4) interface
2993                  */
2994                 switch (event) {
2995                 case IFADDR_EVENT_ADD:
2996                         carp_add_addr(ifp->if_softc, ifa);
2997                         break;
2998
2999                 case IFADDR_EVENT_CHANGE:
3000                         carp_config_addr(ifp->if_softc, ifa);
3001                         break;
3002
3003                 case IFADDR_EVENT_DELETE:
3004                         carp_del_addr(ifp->if_softc, ifa);
3005                         break;
3006                 }
3007                 return;
3008         }
3009
3010         /*
3011          * Address is changed on non-carp(4) interface
3012          */
3013         if ((ifp->if_flags & IFF_MULTICAST) == 0)
3014                 return;
3015
3016         LIST_FOREACH(sc, &carpif_list, sc_next) {
3017                 if (sc->sc_carpdev != NULL && sc->sc_carpdev != ifp) {
3018                         /* Not the parent iface; skip */
3019                         continue;
3020                 }
3021
3022                 switch (event) {
3023                 case IFADDR_EVENT_ADD:
3024                         carp_link_addrs(sc, ifp, ifa);
3025                         break;
3026
3027                 case IFADDR_EVENT_DELETE:
3028                         if (sc->sc_carpdev != NULL) {
3029                                 carp_unlink_addrs(sc, ifp, ifa);
3030                                 if (sc->sc_carpdev == NULL) {
3031                                         /*
3032                                          * We no longer have the parent
3033                                          * interface, however, certain
3034                                          * virtual addresses, which are
3035                                          * not used because they can't
3036                                          * match the previous parent
3037                                          * interface's addresses, may now
3038                                          * match different interface's
3039                                          * addresses.
3040                                          */
3041                                         carp_update_addrs(sc, ifa);
3042                                 }
3043                         } else {
3044                                 /*
3045                                  * The carp(4) interface didn't have a
3046                                  * parent iface, so it is not possible
3047                                  * that it will contain any address to
3048                                  * be unlinked.
3049                                  */
3050                         }
3051                         break;
3052
3053                 case IFADDR_EVENT_CHANGE:
3054                         if (sc->sc_carpdev == NULL) {
3055                                 /*
3056                                  * The carp(4) interface didn't have a
3057                                  * parent iface, so it is not possible
3058                                  * that it will contain any address to
3059                                  * be updated.
3060                                  */
3061                                 carp_link_addrs(sc, ifp, ifa);
3062                         } else {
3063                                 /*
3064                                  * First try breaking tie with the old
3065                                  * address.  Then see whether we could
3066                                  * link certain vhaddr to the new address.
3067                                  * If that fails, i.e. carpdev is NULL,
3068                                  * we try a global update.
3069                                  *
3070                                  * NOTE: The above order is critical.
3071                                  */
3072                                 carp_unlink_addrs(sc, ifp, ifa);
3073                                 carp_link_addrs(sc, ifp, ifa);
3074                                 if (sc->sc_carpdev == NULL) {
3075                                         /*
3076                                          * See the comment in the above
3077                                          * IFADDR_EVENT_DELETE block.
3078                                          */
3079                                         carp_update_addrs(sc, NULL);
3080                                 }
3081                         }
3082                         break;
3083                 }
3084         }
3085 }
3086
3087 void
3088 carp_proto_ctlinput(netmsg_t msg)
3089 {
3090         int cmd = msg->ctlinput.nm_cmd;
3091         struct sockaddr *sa = msg->ctlinput.nm_arg;
3092         struct in_ifaddr_container *iac;
3093
3094         TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
3095                 struct in_ifaddr *ia = iac->ia;
3096                 struct ifnet *ifp = ia->ia_ifp;
3097
3098                 if (ifp->if_type == IFT_CARP)
3099                         continue;
3100
3101                 if (ia->ia_ifa.ifa_addr == sa) {
3102                         if (cmd == PRC_IFDOWN) {
3103                                 carp_ifaddr(NULL, ifp, IFADDR_EVENT_DELETE,
3104                                     &ia->ia_ifa);
3105                         } else if (cmd == PRC_IFUP) {
3106                                 carp_ifaddr(NULL, ifp, IFADDR_EVENT_ADD,
3107                                     &ia->ia_ifa);
3108                         }
3109                         break;
3110                 }
3111         }
3112
3113         lwkt_replymsg(&msg->lmsg, 0);
3114 }
3115
3116 struct ifnet *
3117 carp_parent(struct ifnet *cifp)
3118 {
3119         struct carp_softc *sc;
3120
3121         KKASSERT(cifp->if_type == IFT_CARP);
3122         sc = cifp->if_softc;
3123
3124         return sc->sc_carpdev;
3125 }
3126
3127 #define rtinitflags(x) \
3128         (((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) \
3129                  ? RTF_HOST : 0)
3130
3131 static int
3132 carp_addroute_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha)
3133 {
3134         struct in_ifaddr *ia, *iaback;
3135         int error;
3136
3137         if (sc->sc_state != MASTER)
3138                 return 0;
3139
3140         ia = vha->vha_ia;
3141         KKASSERT(ia != NULL);
3142
3143         iaback = vha->vha_iaback;
3144         KKASSERT(iaback != NULL);
3145
3146         rtinit(&iaback->ia_ifa, RTM_DELETE, rtinitflags(iaback));
3147         in_ifadown(&iaback->ia_ifa, 1);
3148         iaback->ia_flags &= ~IFA_ROUTE;
3149
3150         error = rtinit(&ia->ia_ifa, RTM_ADD, rtinitflags(ia) | RTF_UP);
3151         if (!error)
3152                 ia->ia_flags |= IFA_ROUTE;
3153         return error;
3154 }
3155
3156 static void
3157 carp_delroute_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
3158     boolean_t del_iaback)
3159 {
3160         struct in_ifaddr *ia, *iaback;
3161
3162         ia = vha->vha_ia;
3163         KKASSERT(ia != NULL);
3164
3165         iaback = vha->vha_iaback;
3166         KKASSERT(iaback != NULL);
3167
3168         rtinit(&ia->ia_ifa, RTM_DELETE, rtinitflags(ia));
3169         in_ifadown(&ia->ia_ifa, 1);
3170         ia->ia_flags &= ~IFA_ROUTE;
3171
3172         if (!del_iaback && (iaback->ia_ifp->if_flags & IFF_UP)) {
3173                 int error;
3174
3175                 error = rtinit(&iaback->ia_ifa, RTM_ADD,
3176                     rtinitflags(iaback) | RTF_UP);
3177                 if (!error)
3178                         iaback->ia_flags |= IFA_ROUTE;
3179         }
3180 }
3181
3182 static int
3183 carp_modevent(module_t mod, int type, void *data)
3184 {
3185         switch (type) {
3186         case MOD_LOAD:
3187                 LIST_INIT(&carpif_list);
3188                 carp_ifdetach_event =
3189                 EVENTHANDLER_REGISTER(ifnet_detach_event, carp_ifdetach, NULL,
3190                                       EVENTHANDLER_PRI_ANY);
3191                 carp_ifaddr_event =
3192                 EVENTHANDLER_REGISTER(ifaddr_event, carp_ifaddr, NULL,
3193                                       EVENTHANDLER_PRI_FIRST);
3194                 if_clone_attach(&carp_cloner);
3195                 break;
3196
3197         case MOD_UNLOAD:
3198                 EVENTHANDLER_DEREGISTER(ifnet_detach_event,
3199                                         carp_ifdetach_event);
3200                 EVENTHANDLER_DEREGISTER(ifaddr_event,
3201                                         carp_ifaddr_event);
3202                 if_clone_detach(&carp_cloner);
3203                 break;
3204
3205         default:
3206                 return (EINVAL);
3207         }
3208         return (0);
3209 }
3210
3211 static moduledata_t carp_mod = {
3212         "carp",
3213         carp_modevent,
3214         0
3215 };
3216 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);