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