sys/netinet/ip_carp.c

   1 /*
   2  * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
   3  * Copyright (c) 2003 Ryan McBride. All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
  18  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  20  * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  22  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  23  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  24  * THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26 /*
  27  * $FreeBSD: src/sys/netinet/ip_carp.c,v 1.48 2007/02/02 09:39:09 glebius Exp $
  28  */
  29
  30 #include "opt_carp.h"
  31 #include "opt_inet.h"
  32 #include "opt_inet6.h"
  33
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #include <sys/in_cksum.h>
  38 #include <sys/limits.h>
  39 #include <sys/malloc.h>
  40 #include <sys/mbuf.h>
  41 #include <sys/msgport2.h>
  42 #include <sys/time.h>
  43 #include <sys/proc.h>
  44 #include <sys/priv.h>
  45 #include <sys/sockio.h>
  46 #include <sys/socket.h>
  47 #include <sys/sysctl.h>
  48 #include <sys/syslog.h>
  49 #include <sys/thread.h>
  50
  51 #include <machine/stdarg.h>
  52 #include <crypto/sha1.h>
  53
  54 #include <net/bpf.h>
  55 #include <net/ethernet.h>
  56 #include <net/if.h>
  57 #include <net/if_dl.h>
  58 #include <net/if_types.h>
  59 #include <net/route.h>
  60 #include <net/if_clone.h>
  61 #include <net/if_var.h>
  62 #include <net/ifq_var.h>
  63 #include <net/netmsg2.h>
  64 #include <net/netisr2.h>
  65
  66 #ifdef INET
  67 #include <netinet/in.h>
  68 #include <netinet/in_var.h>
  69 #include <netinet/in_systm.h>
  70 #include <netinet/ip.h>
  71 #include <netinet/ip_var.h>
  72 #include <netinet/if_ether.h>
  73 #endif
  74
  75 #ifdef INET6
  76 #include <netinet/icmp6.h>
  77 #include <netinet/ip6.h>
  78 #include <netinet6/ip6_var.h>
  79 #include <netinet6/scope6_var.h>
  80 #include <netinet6/nd6.h>
  81 #endif
  82
  83 #include <netinet/ip_carp.h>
  84
  85 /*
  86  * Note about carp's MP safe approach:
  87  *
  88  * Brief: carp_softc (softc), carp_softc_container (scc)
  89  *
  90  * - All configuration operation, e.g. ioctl, add/delete inet addresses
  91  *   is serialized by netisr0; not by carp's serializer
  92  *
  93  * - Backing interface's if_carp and carp_softc's relationship:
  94  *
  95  *                +---------+
  96  *     if_carp -->| carp_if |
  97  *                +---------+
  98  *                     |
  99  *                     |
 100  *                     V      +---------+
 101  *                  +-----+   |         |
 102  *                  | scc |-->|  softc  |
 103  *                  +-----+   |         |
 104  *                     |      +---------+
 105  *                     |
 106  *                     V      +---------+
 107  *                  +-----+   |         |
 108  *                  | scc |-->|  softc  |
 109  *                  +-----+   |         |
 110  *                            +---------+
 111  *
 112  * - if_carp creation, modification and deletion all happen in netisr0,
 113  *   as stated previously.  Since if_carp is accessed by multiple netisrs,
 114  *   the modification to if_carp is conducted in the following way:
 115  *
 116  *   Adding carp_softc:
 117  *
 118  *   1) Duplicate the old carp_if to new carp_if (ncif), and insert the
 119  *      to-be-added carp_softc to the new carp_if (ncif):
 120  *
 121  *        if_carp                     ncif
 122  *           |                         |
 123  *           V                         V
 124  *      +---------+               +---------+
 125  *      | carp_if |               | carp_if |
 126  *      +---------+               +---------+
 127  *           |                         |
 128  *           |                         |
 129  *           V        +-------+        V
 130  *        +-----+     |       |     +-----+
 131  *        | scc |---->| softc |<----| scc |
 132  *        +-----+     |       |     +-----+
 133  *           |        +-------+        |
 134  *           |                         |
 135  *           V        +-------+        V
 136  *        +-----+     |       |     +-----+
 137  *        | scc |---->| softc |<----| scc |
 138  *        +-----+     |       |     +-----+
 139  *                    +-------+        |
 140  *                                     |
 141  *                    +-------+        V
 142  *                    |       |     +-----+
 143  *                    | softc |<----| scc |
 144  *                    |       |     +-----+
 145  *                    +-------+
 146  *
 147  *   2) Switch save if_carp into ocif and switch if_carp to ncif:
 148  *
 149  *          ocif                    if_carp
 150  *           |                         |
 151  *           V                         V
 152  *      +---------+               +---------+
 153  *      | carp_if |               | carp_if |
 154  *      +---------+               +---------+
 155  *           |                         |
 156  *           |                         |
 157  *           V        +-------+        V
 158  *        +-----+     |       |     +-----+
 159  *        | scc |---->| softc |<----| scc |
 160  *        +-----+     |       |     +-----+
 161  *           |        +-------+        |
 162  *           |                         |
 163  *           V        +-------+        V
 164  *        +-----+     |       |     +-----+
 165  *        | scc |---->| softc |<----| scc |
 166  *        +-----+     |       |     +-----+
 167  *                    +-------+        |
 168  *                                     |
 169  *                    +-------+        V
 170  *                    |       |     +-----+
 171  *                    | softc |<----| scc |
 172  *                    |       |     +-----+
 173  *                    +-------+
 174  *
 175  *   3) Run netmsg_service_sync(), which will make sure that
 176  *      ocif is no longer accessed (all network operations
 177  *      are happened only in network threads).
 178  *   4) Free ocif -- only carp_if and scc are freed.
 179  *
 180  *
 181  *   Removing carp_softc:
 182  *
 183  *   1) Duplicate the old carp_if to new carp_if (ncif); the to-be-deleted
 184  *      carp_softc will not be duplicated.
 185  *
 186  *        if_carp                     ncif
 187  *           |                         |
 188  *           V                         V
 189  *      +---------+               +---------+
 190  *      | carp_if |               | carp_if |
 191  *      +---------+               +---------+
 192  *           |                         |
 193  *           |                         |
 194  *           V        +-------+        V
 195  *        +-----+     |       |     +-----+
 196  *        | scc |---->| softc |<----| scc |
 197  *        +-----+     |       |     +-----+
 198  *           |        +-------+        |
 199  *           |                         |
 200  *           V        +-------+        |
 201  *        +-----+     |       |        |
 202  *        | scc |---->| softc |        |
 203  *        +-----+     |       |        |
 204  *           |        +-------+        |
 205  *           |                         |
 206  *           V        +-------+        V
 207  *        +-----+     |       |     +-----+
 208  *        | scc |---->| softc |<----| scc |
 209  *        +-----+     |       |     +-----+
 210  *                    +-------+
 211  *
 212  *   2) Switch save if_carp into ocif and switch if_carp to ncif:
 213  *
 214  *          ocif                    if_carp
 215  *           |                         |
 216  *           V                         V
 217  *      +---------+               +---------+
 218  *      | carp_if |               | carp_if |
 219  *      +---------+               +---------+
 220  *           |                         |
 221  *           |                         |
 222  *           V        +-------+        V
 223  *        +-----+     |       |     +-----+
 224  *        | scc |---->| softc |<----| scc |
 225  *        +-----+     |       |     +-----+
 226  *           |        +-------+        |
 227  *           |                         |
 228  *           V        +-------+        |
 229  *        +-----+     |       |        |
 230  *        | scc |---->| softc |        |
 231  *        +-----+     |       |        |
 232  *           |        +-------+        |
 233  *           |                         |
 234  *           V        +-------+        V
 235  *        +-----+     |       |     +-----+
 236  *        | scc |---->| softc |<----| scc |
 237  *        +-----+     |       |     +-----+
 238  *                    +-------+
 239  *
 240  *   3) Run netmsg_service_sync(), which will make sure that
 241  *      ocif is no longer accessed (all network operations
 242  *      are happened only in network threads).
 243  *   4) Free ocif -- only carp_if and scc are freed.
 244  *
 245  * - if_carp accessing:
 246  *   The accessing code should cache the if_carp in a local temporary
 247  *   variable and accessing the temporary variable along the code path
 248  *   instead of accessing if_carp later on.
 249  */
 250
 251 #define CARP_IFNAME             "carp"
 252 #define CARP_IS_RUNNING(ifp)    \
 253         (((ifp)->if_flags & (IFF_UP | IFF_RUNNING)) == (IFF_UP | IFF_RUNNING))
 254
 255 struct carp_softc;
 256
 257 struct carp_vhaddr {
 258         uint32_t                vha_flags;      /* CARP_VHAF_ */
 259         struct in_ifaddr        *vha_ia;        /* carp address */
 260         struct in_ifaddr        *vha_iaback;    /* backing address */
 261         TAILQ_ENTRY(carp_vhaddr) vha_link;
 262 };
 263 TAILQ_HEAD(carp_vhaddr_list, carp_vhaddr);
 264
 265 struct netmsg_carp {
 266         struct netmsg_base      base;
 267         struct ifnet            *nc_carpdev;
 268         struct carp_softc       *nc_softc;
 269         void                    *nc_data;
 270         size_t                  nc_datalen;
 271 };
 272
 273 struct carp_softc {
 274         struct arpcom            arpcom;
 275         struct ifnet            *sc_carpdev;    /* parent interface */
 276         struct carp_vhaddr_list  sc_vha_list;   /* virtual addr list */
 277
 278         const struct in_ifaddr  *sc_ia;         /* primary iface address v4 */
 279         struct ip_moptions       sc_imo;
 280
 281 #ifdef INET6
 282         struct in6_ifaddr       *sc_ia6;        /* primary iface address v6 */
 283         struct ip6_moptions      sc_im6o;
 284 #endif /* INET6 */
 285
 286         enum { INIT = 0, BACKUP, MASTER }
 287                                  sc_state;
 288         boolean_t                sc_dead;
 289
 290         int                      sc_suppress;
 291
 292         int                      sc_sendad_errors;
 293 #define CARP_SENDAD_MAX_ERRORS  3
 294         int                      sc_sendad_success;
 295 #define CARP_SENDAD_MIN_SUCCESS 3
 296
 297         int                      sc_vhid;
 298         int                      sc_advskew;
 299         int                      sc_naddrs;     /* actually used IPv4 vha */
 300         int                      sc_naddrs6;
 301         int                      sc_advbase;    /* seconds */
 302         int                      sc_init_counter;
 303         uint64_t                 sc_counter;
 304
 305         /* authentication */
 306 #define CARP_HMAC_PAD   64
 307         unsigned char            sc_key[CARP_KEY_LEN];
 308         unsigned char            sc_pad[CARP_HMAC_PAD];
 309         SHA1_CTX                 sc_sha1;
 310
 311         struct callout           sc_ad_tmo;     /* advertisement timeout */
 312         struct netmsg_carp       sc_ad_msg;     /* adv timeout netmsg */
 313         struct callout           sc_md_tmo;     /* ip4 master down timeout */
 314         struct callout           sc_md6_tmo;    /* ip6 master down timeout */
 315         struct netmsg_carp       sc_md_msg;     /* master down timeout netmsg */
 316
 317         LIST_ENTRY(carp_softc)   sc_next;       /* Interface clue */
 318 };
 319
 320 #define sc_if   arpcom.ac_if
 321
 322 struct carp_softc_container {
 323         TAILQ_ENTRY(carp_softc_container) scc_link;
 324         struct carp_softc       *scc_softc;
 325 };
 326 TAILQ_HEAD(carp_if, carp_softc_container);
 327
 328 SYSCTL_DECL(_net_inet_carp);
 329
 330 static int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0, 1 }; /* XXX for now */
 331 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW,
 332     &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets");
 333 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW,
 334     &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode");
 335 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW,
 336     &carp_opts[CARPCTL_LOG], 0, "log bad carp packets");
 337 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW,
 338     &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses");
 339 SYSCTL_INT(_net_inet_carp, CARPCTL_SETROUTE, setroute, CTLFLAG_RW,
 340     &carp_opts[CARPCTL_SETROUTE], 0, "set route");
 341
 342 static int carp_suppress_preempt = 0;
 343 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD,
 344     &carp_suppress_preempt, 0, "Preemption is suppressed");
 345
 346 static int carp_prio_ad = 1;
 347 SYSCTL_INT(_net_inet_carp, OID_AUTO, prio_ad, CTLFLAG_RD,
 348     &carp_prio_ad, 0, "Prioritize advertisement packet");
 349
 350 static struct carpstats carpstats;
 351 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW,
 352     &carpstats, carpstats,
 353     "CARP statistics (struct carpstats, netinet/ip_carp.h)");
 354
 355 #define CARP_LOG(...)   do {                            \
 356         if (carp_opts[CARPCTL_LOG] > 0)                 \
 357                 log(LOG_INFO, __VA_ARGS__);             \
 358 } while (0)
 359
 360 #define CARP_DEBUG(...) do {                            \
 361         if (carp_opts[CARPCTL_LOG] > 1)                 \
 362                 log(LOG_DEBUG, __VA_ARGS__);            \
 363 } while (0)
 364
 365 static struct lwkt_token carp_listtok = LWKT_TOKEN_INITIALIZER(carp_list_token);
 366
 367 static void     carp_hmac_prepare(struct carp_softc *);
 368 static void     carp_hmac_generate(struct carp_softc *, uint32_t *,
 369                     unsigned char *);
 370 static int      carp_hmac_verify(struct carp_softc *, uint32_t *,
 371                     unsigned char *);
 372 static void     carp_setroute(struct carp_softc *, int);
 373 static void     carp_proto_input_c(struct carp_softc *, struct mbuf *,
 374                     struct carp_header *, sa_family_t);
 375 static int      carp_clone_create(struct if_clone *, int, caddr_t);
 376 static int      carp_clone_destroy(struct ifnet *);
 377 static void     carp_detach(struct carp_softc *, boolean_t, boolean_t);
 378 static void     carp_prepare_ad(struct carp_softc *, struct carp_header *);
 379 static void     carp_send_ad_all(void);
 380 static void     carp_send_ad_timeout(void *);
 381 static void     carp_send_ad(struct carp_softc *);
 382 static void     carp_send_arp(struct carp_softc *);
 383 static void     carp_master_down_timeout(void *);
 384 static void     carp_master_down(struct carp_softc *);
 385 static void     carp_setrun(struct carp_softc *, sa_family_t);
 386 static void     carp_set_state(struct carp_softc *, int);
 387 static struct ifnet *carp_forus(struct carp_if *, const uint8_t *);
 388
 389 static void     carp_init(void *);
 390 static int      carp_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
 391 static int      carp_output(struct ifnet *, struct mbuf *, struct sockaddr *,
 392                     struct rtentry *);
 393 static void     carp_start(struct ifnet *, struct ifaltq_subque *);
 394
 395 static void     carp_multicast_cleanup(struct carp_softc *);
 396 static void     carp_add_addr(struct carp_softc *, struct ifaddr *);
 397 static void     carp_del_addr(struct carp_softc *, struct ifaddr *);
 398 static void     carp_config_addr(struct carp_softc *, struct ifaddr *);
 399 static void     carp_link_addrs(struct carp_softc *, struct ifnet *,
 400                     struct ifaddr *);
 401 static void     carp_unlink_addrs(struct carp_softc *, struct ifnet *,
 402                     struct ifaddr *);
 403 static void     carp_update_addrs(struct carp_softc *, struct ifaddr *);
 404
 405 static int      carp_config_vhaddr(struct carp_softc *, struct carp_vhaddr *,
 406                     struct in_ifaddr *);
 407 static int      carp_activate_vhaddr(struct carp_softc *, struct carp_vhaddr *,
 408                     struct ifnet *, struct in_ifaddr *, int);
 409 static void     carp_deactivate_vhaddr(struct carp_softc *,
 410                     struct carp_vhaddr *, boolean_t);
 411 static int      carp_addroute_vhaddr(struct carp_softc *, struct carp_vhaddr *);
 412 static void     carp_delroute_vhaddr(struct carp_softc *, struct carp_vhaddr *,
 413                     boolean_t);
 414
 415 #ifdef foo
 416 static void     carp_sc_state(struct carp_softc *);
 417 #endif
 418 #ifdef INET6
 419 static void     carp_send_na(struct carp_softc *);
 420 #ifdef notyet
 421 static int      carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *);
 422 static int      carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *);
 423 #endif
 424 static void     carp_multicast6_cleanup(struct carp_softc *);
 425 #endif
 426 static void     carp_stop(struct carp_softc *, boolean_t);
 427 static void     carp_suspend(struct carp_softc *, boolean_t);
 428 static void     carp_ioctl_stop(struct carp_softc *);
 429 static int      carp_ioctl_setvh(struct carp_softc *, void *, struct ucred *);
 430 static void     carp_ioctl_ifcap(struct carp_softc *, int);
 431 static int      carp_ioctl_getvh(struct carp_softc *, void *, struct ucred *);
 432 static int      carp_ioctl_getdevname(struct carp_softc *, struct ifdrv *);
 433 static int      carp_ioctl_getvhaddr(struct carp_softc *, struct ifdrv *);
 434
 435 static struct carp_if *carp_if_remove(struct carp_if *, struct carp_softc *);
 436 static struct carp_if *carp_if_insert(struct carp_if *, struct carp_softc *);
 437 static void     carp_if_free(struct carp_if *);
 438
 439 static void     carp_ifaddr(void *, struct ifnet *, enum ifaddr_event,
 440                             struct ifaddr *);
 441 static void     carp_ifdetach(void *, struct ifnet *);
 442
 443 static void     carp_ifdetach_dispatch(netmsg_t);
 444 static void     carp_clone_destroy_dispatch(netmsg_t);
 445 static void     carp_init_dispatch(netmsg_t);
 446 static void     carp_ioctl_stop_dispatch(netmsg_t);
 447 static void     carp_ioctl_setvh_dispatch(netmsg_t);
 448 static void     carp_ioctl_ifcap_dispatch(netmsg_t);
 449 static void     carp_ioctl_getvh_dispatch(netmsg_t);
 450 static void     carp_ioctl_getdevname_dispatch(netmsg_t);
 451 static void     carp_ioctl_getvhaddr_dispatch(netmsg_t);
 452 static void     carp_send_ad_timeout_dispatch(netmsg_t);
 453 static void     carp_master_down_timeout_dispatch(netmsg_t);
 454
 455 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces");
 456
 457 static LIST_HEAD(, carp_softc) carpif_list;
 458
 459 static struct if_clone carp_cloner =
 460 IF_CLONE_INITIALIZER(CARP_IFNAME, carp_clone_create, carp_clone_destroy,
 461                      0, IF_MAXUNIT);
 462
 463 static const uint8_t    carp_etheraddr[ETHER_ADDR_LEN] =
 464         { 0, 0, 0x5e, 0, 1, 0 };
 465
 466 static eventhandler_tag carp_ifdetach_event;
 467 static eventhandler_tag carp_ifaddr_event;
 468
 469 static __inline void
 470 carp_insert_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha_new)
 471 {
 472         struct carp_vhaddr *vha;
 473         u_long new_addr, addr;
 474
 475         KKASSERT((vha_new->vha_flags & CARP_VHAF_ONLIST) == 0);
 476
 477         /*
 478          * Virtual address list is sorted; smaller one first
 479          */
 480         new_addr = ntohl(vha_new->vha_ia->ia_addr.sin_addr.s_addr);
 481
 482         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
 483                 addr = ntohl(vha->vha_ia->ia_addr.sin_addr.s_addr);
 484
 485                 if (addr > new_addr)
 486                         break;
 487         }
 488         if (vha == NULL)
 489                 TAILQ_INSERT_TAIL(&sc->sc_vha_list, vha_new, vha_link);
 490         else
 491                 TAILQ_INSERT_BEFORE(vha, vha_new, vha_link);
 492         vha_new->vha_flags |= CARP_VHAF_ONLIST;
 493 }
 494
 495 static __inline void
 496 carp_remove_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha)
 497 {
 498         KKASSERT(vha->vha_flags & CARP_VHAF_ONLIST);
 499         vha->vha_flags &= ~CARP_VHAF_ONLIST;
 500         TAILQ_REMOVE(&sc->sc_vha_list, vha, vha_link);
 501 }
 502
 503 static void
 504 carp_hmac_prepare(struct carp_softc *sc)
 505 {
 506         uint8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
 507         uint8_t vhid = sc->sc_vhid & 0xff;
 508         int i;
 509 #ifdef INET6
 510         struct ifaddr_container *ifac;
 511         struct in6_addr in6;
 512 #endif
 513 #ifdef INET
 514         struct carp_vhaddr *vha;
 515 #endif
 516
 517         /* XXX: possible race here */
 518
 519         /* compute ipad from key */
 520         bzero(sc->sc_pad, sizeof(sc->sc_pad));
 521         bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
 522         for (i = 0; i < sizeof(sc->sc_pad); i++)
 523                 sc->sc_pad[i] ^= 0x36;
 524
 525         /* precompute first part of inner hash */
 526         SHA1Init(&sc->sc_sha1);
 527         SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
 528         SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
 529         SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
 530         SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
 531 #ifdef INET
 532         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
 533                 SHA1Update(&sc->sc_sha1,
 534                     (const uint8_t *)&vha->vha_ia->ia_addr.sin_addr,
 535                     sizeof(struct in_addr));
 536         }
 537 #endif /* INET */
 538 #ifdef INET6
 539         TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
 540                 struct ifaddr *ifa = ifac->ifa;
 541
 542                 if (ifa->ifa_addr->sa_family == AF_INET6) {
 543                         in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
 544                         in6_clearscope(&in6);
 545                         SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6));
 546                 }
 547         }
 548 #endif /* INET6 */
 549
 550         /* convert ipad to opad */
 551         for (i = 0; i < sizeof(sc->sc_pad); i++)
 552                 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
 553 }
 554
 555 static void
 556 carp_hmac_generate(struct carp_softc *sc, uint32_t counter[2],
 557     unsigned char md[20])
 558 {
 559         SHA1_CTX sha1ctx;
 560
 561         /* fetch first half of inner hash */
 562         bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
 563
 564         SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
 565         SHA1Final(md, &sha1ctx);
 566
 567         /* outer hash */
 568         SHA1Init(&sha1ctx);
 569         SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
 570         SHA1Update(&sha1ctx, md, 20);
 571         SHA1Final(md, &sha1ctx);
 572 }
 573
 574 static int
 575 carp_hmac_verify(struct carp_softc *sc, uint32_t counter[2],
 576     unsigned char md[20])
 577 {
 578         unsigned char md2[20];
 579
 580         carp_hmac_generate(sc, counter, md2);
 581         return (bcmp(md, md2, sizeof(md2)));
 582 }
 583
 584 static void
 585 carp_setroute(struct carp_softc *sc, int cmd)
 586 {
 587 #ifdef INET6
 588         struct ifaddr_container *ifac;
 589 #endif
 590         struct carp_vhaddr *vha;
 591
 592         KKASSERT(cmd == RTM_DELETE || cmd == RTM_ADD);
 593
 594         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
 595                 if (vha->vha_iaback == NULL)
 596                         continue;
 597                 if (cmd == RTM_DELETE)
 598                         carp_delroute_vhaddr(sc, vha, FALSE);
 599                 else
 600                         carp_addroute_vhaddr(sc, vha);
 601         }
 602
 603 #ifdef INET6
 604         TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
 605                 struct ifaddr *ifa = ifac->ifa;
 606
 607                 if (ifa->ifa_addr->sa_family == AF_INET6) {
 608                         if (cmd == RTM_ADD)
 609                                 in6_ifaddloop(ifa);
 610                         else
 611                                 in6_ifremloop(ifa);
 612                 }
 613         }
 614 #endif /* INET6 */
 615 }
 616
 617 static int
 618 carp_clone_create(struct if_clone *ifc, int unit, caddr_t param __unused)
 619 {
 620         struct carp_softc *sc;
 621         struct ifnet *ifp;
 622
 623         sc = kmalloc(sizeof(*sc), M_CARP, M_WAITOK | M_ZERO);
 624         ifp = &sc->sc_if;
 625
 626         sc->sc_suppress = 0;
 627         sc->sc_advbase = CARP_DFLTINTV;
 628         sc->sc_vhid = -1;       /* required setting */
 629         sc->sc_advskew = 0;
 630         sc->sc_init_counter = 1;
 631         sc->sc_naddrs = 0;
 632         sc->sc_naddrs6 = 0;
 633
 634         TAILQ_INIT(&sc->sc_vha_list);
 635
 636 #ifdef INET6
 637         sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
 638 #endif
 639
 640         callout_init_mp(&sc->sc_ad_tmo);
 641         netmsg_init(&sc->sc_ad_msg.base, NULL, &netisr_adone_rport,
 642             MSGF_DROPABLE | MSGF_PRIORITY, carp_send_ad_timeout_dispatch);
 643         sc->sc_ad_msg.nc_softc = sc;
 644
 645         callout_init_mp(&sc->sc_md_tmo);
 646         callout_init_mp(&sc->sc_md6_tmo);
 647         netmsg_init(&sc->sc_md_msg.base, NULL, &netisr_adone_rport,
 648             MSGF_DROPABLE | MSGF_PRIORITY, carp_master_down_timeout_dispatch);
 649         sc->sc_md_msg.nc_softc = sc;
 650
 651         if_initname(ifp, CARP_IFNAME, unit);
 652         ifp->if_softc = sc;
 653         ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
 654         ifp->if_init = carp_init;
 655         ifp->if_ioctl = carp_ioctl;
 656         ifp->if_start = carp_start;
 657
 658         ifp->if_capabilities = IFCAP_TXCSUM | IFCAP_TSO;
 659         ifp->if_capenable = ifp->if_capabilities;
 660         /*
 661          * Leave if_hwassist as it is; if_hwassist will be
 662          * setup when this carp interface has parent.
 663          */
 664
 665         ifq_set_maxlen(&ifp->if_snd, ifqmaxlen);
 666         ifq_set_ready(&ifp->if_snd);
 667
 668         ether_ifattach(ifp, carp_etheraddr, NULL);
 669
 670         ifp->if_type = IFT_CARP;
 671         ifp->if_output = carp_output;
 672
 673         lwkt_gettoken(&carp_listtok);
 674         LIST_INSERT_HEAD(&carpif_list, sc, sc_next);
 675         lwkt_reltoken(&carp_listtok);
 676
 677         return (0);
 678 }
 679
 680 static void
 681 carp_clone_destroy_dispatch(netmsg_t msg)
 682 {
 683         struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
 684         struct carp_softc *sc = cmsg->nc_softc;
 685
 686         sc->sc_dead = TRUE;
 687         carp_detach(sc, TRUE, FALSE);
 688
 689         callout_stop_sync(&sc->sc_ad_tmo);
 690         callout_stop_sync(&sc->sc_md_tmo);
 691         callout_stop_sync(&sc->sc_md6_tmo);
 692
 693         crit_enter();
 694         lwkt_dropmsg(&sc->sc_ad_msg.base.lmsg);
 695         lwkt_dropmsg(&sc->sc_md_msg.base.lmsg);
 696         crit_exit();
 697
 698         lwkt_replymsg(&cmsg->base.lmsg, 0);
 699 }
 700
 701 static int
 702 carp_clone_destroy(struct ifnet *ifp)
 703 {
 704         struct carp_softc *sc = ifp->if_softc;
 705         struct netmsg_carp cmsg;
 706
 707         bzero(&cmsg, sizeof(cmsg));
 708         netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
 709             carp_clone_destroy_dispatch);
 710         cmsg.nc_softc = sc;
 711
 712         lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
 713
 714         lwkt_gettoken(&carp_listtok);
 715         LIST_REMOVE(sc, sc_next);
 716         lwkt_reltoken(&carp_listtok);
 717
 718         bpfdetach(ifp);
 719         if_detach(ifp);
 720
 721         KASSERT(sc->sc_naddrs == 0, ("certain inet address is still active"));
 722         kfree(sc, M_CARP);
 723
 724         return 0;
 725 }
 726
 727 static struct carp_if *
 728 carp_if_remove(struct carp_if *ocif, struct carp_softc *sc)
 729 {
 730         struct carp_softc_container *oscc, *scc;
 731         struct carp_if *cif;
 732         int count = 0;
 733 #ifdef INVARIANTS
 734         int found = 0;
 735 #endif
 736
 737         TAILQ_FOREACH(oscc, ocif, scc_link) {
 738                 ++count;
 739 #ifdef INVARIANTS
 740                 if (oscc->scc_softc == sc)
 741                         found = 1;
 742 #endif
 743         }
 744         KASSERT(found, ("%s carp_softc is not on carp_if", __func__));
 745
 746         if (count == 1) {
 747                 /* Last one is going to be unlinked */
 748                 return NULL;
 749         }
 750
 751         cif = kmalloc(sizeof(*cif), M_CARP, M_WAITOK | M_ZERO);
 752         TAILQ_INIT(cif);
 753
 754         TAILQ_FOREACH(oscc, ocif, scc_link) {
 755                 if (oscc->scc_softc == sc)
 756                         continue;
 757
 758                 scc = kmalloc(sizeof(*scc), M_CARP, M_WAITOK | M_ZERO);
 759                 scc->scc_softc = oscc->scc_softc;
 760                 TAILQ_INSERT_TAIL(cif, scc, scc_link);
 761         }
 762
 763         return cif;
 764 }
 765
 766 static struct carp_if *
 767 carp_if_insert(struct carp_if *ocif, struct carp_softc *sc)
 768 {
 769         struct carp_softc_container *oscc;
 770         int onlist;
 771
 772         onlist = 0;
 773         if (ocif != NULL) {
 774                 TAILQ_FOREACH(oscc, ocif, scc_link) {
 775                         if (oscc->scc_softc == sc)
 776                                 onlist = 1;
 777                 }
 778         }
 779
 780 #ifdef INVARIANTS
 781         if (sc->sc_carpdev != NULL) {
 782                 KASSERT(onlist, ("%s is not on %s carp list",
 783                     sc->sc_if.if_xname, sc->sc_carpdev->if_xname));
 784         } else {
 785                 KASSERT(!onlist, ("%s is already on carp list",
 786                     sc->sc_if.if_xname));
 787         }
 788 #endif
 789
 790         if (!onlist) {
 791                 struct carp_if *cif;
 792                 struct carp_softc_container *new_scc, *scc;
 793                 int inserted = 0;
 794
 795                 cif = kmalloc(sizeof(*cif), M_CARP, M_WAITOK | M_ZERO);
 796                 TAILQ_INIT(cif);
 797
 798                 new_scc = kmalloc(sizeof(*new_scc), M_CARP, M_WAITOK | M_ZERO);
 799                 new_scc->scc_softc = sc;
 800
 801                 if (ocif != NULL) {
 802                         TAILQ_FOREACH(oscc, ocif, scc_link) {
 803                                 if (!inserted &&
 804                                     oscc->scc_softc->sc_vhid > sc->sc_vhid) {
 805                                         TAILQ_INSERT_TAIL(cif, new_scc,
 806                                             scc_link);
 807                                         inserted = 1;
 808                                 }
 809
 810                                 scc = kmalloc(sizeof(*scc), M_CARP,
 811                                     M_WAITOK | M_ZERO);
 812                                 scc->scc_softc = oscc->scc_softc;
 813                                 TAILQ_INSERT_TAIL(cif, scc, scc_link);
 814                         }
 815                 }
 816                 if (!inserted)
 817                         TAILQ_INSERT_TAIL(cif, new_scc, scc_link);
 818
 819                 return cif;
 820         } else {
 821                 return ocif;
 822         }
 823 }
 824
 825 static void
 826 carp_if_free(struct carp_if *cif)
 827 {
 828         struct carp_softc_container *scc;
 829
 830         while ((scc = TAILQ_FIRST(cif)) != NULL) {
 831                 TAILQ_REMOVE(cif, scc, scc_link);
 832                 kfree(scc, M_CARP);
 833         }
 834         kfree(cif, M_CARP);
 835 }
 836
 837 static void
 838 carp_detach(struct carp_softc *sc, boolean_t detach, boolean_t del_iaback)
 839 {
 840         carp_suspend(sc, detach);
 841
 842         carp_multicast_cleanup(sc);
 843 #ifdef INET6
 844         carp_multicast6_cleanup(sc);
 845 #endif
 846
 847         if (!sc->sc_dead && detach) {
 848                 struct carp_vhaddr *vha;
 849
 850                 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
 851                         carp_deactivate_vhaddr(sc, vha, del_iaback);
 852                 KKASSERT(sc->sc_naddrs == 0);
 853         }
 854
 855         if (sc->sc_carpdev != NULL) {
 856                 struct ifnet *ifp = sc->sc_carpdev;
 857                 struct carp_if *ocif = ifp->if_carp;
 858
 859                 ifp->if_carp = carp_if_remove(ocif, sc);
 860                 KASSERT(ifp->if_carp != ocif,
 861                     ("%s carp_if_remove failed", __func__));
 862
 863                 sc->sc_carpdev = NULL;
 864                 sc->sc_ia = NULL;
 865                 sc->arpcom.ac_if.if_hwassist = 0;
 866
 867                 /*
 868                  * Make sure that all protocol threads see the
 869                  * sc_carpdev and if_carp changes
 870                  */
 871                 netmsg_service_sync();
 872
 873                 if (ifp->if_carp == NULL) {
 874                         /*
 875                          * No more carp interfaces using
 876                          * ifp as the backing interface,
 877                          * move it out of promiscous mode.
 878                          */
 879                         ifpromisc(ifp, 0);
 880                 }
 881
 882                 /*
 883                  * The old carp list could be safely free now,
 884                  * since no one can access it.
 885                  */
 886                 carp_if_free(ocif);
 887         }
 888 }
 889
 890 static void
 891 carp_ifdetach_dispatch(netmsg_t msg)
 892 {
 893         struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
 894         struct ifnet *ifp = cmsg->nc_carpdev;
 895
 896         while (ifp->if_carp) {
 897                 struct carp_softc_container *scc;
 898
 899                 scc = TAILQ_FIRST((struct carp_if *)(ifp->if_carp));
 900                 carp_detach(scc->scc_softc, TRUE, TRUE);
 901         }
 902         lwkt_replymsg(&cmsg->base.lmsg, 0);
 903 }
 904
 905 /* Detach an interface from the carp. */
 906 static void
 907 carp_ifdetach(void *arg __unused, struct ifnet *ifp)
 908 {
 909         struct netmsg_carp cmsg;
 910
 911         ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp);
 912
 913         bzero(&cmsg, sizeof(cmsg));
 914         netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
 915             carp_ifdetach_dispatch);
 916         cmsg.nc_carpdev = ifp;
 917
 918         lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
 919 }
 920
 921 /*
 922  * process input packet.
 923  * we have rearranged checks order compared to the rfc,
 924  * but it seems more efficient this way or not possible otherwise.
 925  */
 926 int
 927 carp_proto_input(struct mbuf **mp, int *offp, int proto)
 928 {
 929         struct mbuf *m = *mp;
 930         struct ip *ip = mtod(m, struct ip *);
 931         struct ifnet *ifp = m->m_pkthdr.rcvif;
 932         struct carp_header *ch;
 933         struct carp_softc *sc;
 934         int len, iphlen;
 935
 936         iphlen = *offp;
 937         *mp = NULL;
 938
 939         carpstats.carps_ipackets++;
 940
 941         if (!carp_opts[CARPCTL_ALLOW]) {
 942                 m_freem(m);
 943                 goto back;
 944         }
 945
 946         /* Check if received on a valid carp interface */
 947         if (ifp->if_type != IFT_CARP) {
 948                 carpstats.carps_badif++;
 949                 CARP_LOG("carp_proto_input: packet received on non-carp "
 950                     "interface: %s\n", ifp->if_xname);
 951                 m_freem(m);
 952                 goto back;
 953         }
 954
 955         if (!CARP_IS_RUNNING(ifp)) {
 956                 carpstats.carps_badif++;
 957                 CARP_LOG("carp_proto_input: packet received on stopped carp "
 958                     "interface: %s\n", ifp->if_xname);
 959                 m_freem(m);
 960                 goto back;
 961         }
 962
 963         sc = ifp->if_softc;
 964         if (sc->sc_carpdev == NULL) {
 965                 carpstats.carps_badif++;
 966                 CARP_LOG("carp_proto_input: packet received on defunc carp "
 967                     "interface: %s\n", ifp->if_xname);
 968                 m_freem(m);
 969                 goto back;
 970         }
 971
 972         if (!IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 973                 carpstats.carps_badif++;
 974                 CARP_LOG("carp_proto_input: non-mcast packet on "
 975                     "interface: %s\n", ifp->if_xname);
 976                 m_freem(m);
 977                 goto back;
 978         }
 979
 980         /* Verify that the IP TTL is CARP_DFLTTL. */
 981         if (ip->ip_ttl != CARP_DFLTTL) {
 982                 carpstats.carps_badttl++;
 983                 CARP_LOG("carp_proto_input: received ttl %d != %d on %s\n",
 984                     ip->ip_ttl, CARP_DFLTTL, ifp->if_xname);
 985                 m_freem(m);
 986                 goto back;
 987         }
 988
 989         /* Minimal CARP packet size */
 990         len = iphlen + sizeof(*ch);
 991
 992         /*
 993          * Verify that the received packet length is
 994          * not less than the CARP header
 995          */
 996         if (m->m_pkthdr.len < len) {
 997                 carpstats.carps_badlen++;
 998                 CARP_LOG("packet too short %d on %s\n", m->m_pkthdr.len,
 999                     ifp->if_xname);
1000                 m_freem(m);
1001                 goto back;
1002         }
1003
1004         /* Make sure that CARP header is contiguous */
1005         if (len > m->m_len) {
1006                 m = m_pullup(m, len);
1007                 if (m == NULL) {
1008                         carpstats.carps_hdrops++;
1009                         CARP_LOG("carp_proto_input: m_pullup failed\n");
1010                         goto back;
1011                 }
1012                 ip = mtod(m, struct ip *);
1013         }
1014         ch = (struct carp_header *)((uint8_t *)ip + iphlen);
1015
1016         /* Verify the CARP checksum */
1017         if (in_cksum_skip(m, len, iphlen)) {
1018                 carpstats.carps_badsum++;
1019                 CARP_LOG("carp_proto_input: checksum failed on %s\n",
1020                     ifp->if_xname);
1021                 m_freem(m);
1022                 goto back;
1023         }
1024         carp_proto_input_c(sc, m, ch, AF_INET);
1025 back:
1026         return(IPPROTO_DONE);
1027 }
1028
1029 #ifdef INET6
1030 int
1031 carp6_proto_input(struct mbuf **mp, int *offp, int proto)
1032 {
1033         struct mbuf *m = *mp;
1034         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1035         struct ifnet *ifp = m->m_pkthdr.rcvif;
1036         struct carp_header *ch;
1037         struct carp_softc *sc;
1038         u_int len;
1039
1040         carpstats.carps_ipackets6++;
1041
1042         if (!carp_opts[CARPCTL_ALLOW]) {
1043                 m_freem(m);
1044                 goto back;
1045         }
1046
1047         /* check if received on a valid carp interface */
1048         if (ifp->if_type != IFT_CARP) {
1049                 carpstats.carps_badif++;
1050                 CARP_LOG("carp6_proto_input: packet received on non-carp "
1051                     "interface: %s\n", ifp->if_xname);
1052                 m_freem(m);
1053                 goto back;
1054         }
1055
1056         if (!CARP_IS_RUNNING(ifp)) {
1057                 carpstats.carps_badif++;
1058                 CARP_LOG("carp_proto_input: packet received on stopped carp "
1059                     "interface: %s\n", ifp->if_xname);
1060                 m_freem(m);
1061                 goto back;
1062         }
1063
1064         sc = ifp->if_softc;
1065         if (sc->sc_carpdev == NULL) {
1066                 carpstats.carps_badif++;
1067                 CARP_LOG("carp6_proto_input: packet received on defunc-carp "
1068                     "interface: %s\n", ifp->if_xname);
1069                 m_freem(m);
1070                 goto back;
1071         }
1072
1073         /* verify that the IP TTL is 255 */
1074         if (ip6->ip6_hlim != CARP_DFLTTL) {
1075                 carpstats.carps_badttl++;
1076                 CARP_LOG("carp6_proto_input: received ttl %d != 255 on %s\n",
1077                     ip6->ip6_hlim, ifp->if_xname);
1078                 m_freem(m);
1079                 goto back;
1080         }
1081
1082         /* verify that we have a complete carp packet */
1083         len = m->m_len;
1084         IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
1085         if (ch == NULL) {
1086                 carpstats.carps_badlen++;
1087                 CARP_LOG("carp6_proto_input: packet size %u too small\n", len);
1088                 goto back;
1089         }
1090
1091         /* verify the CARP checksum */
1092         if (in_cksum_range(m, 0, *offp, sizeof(*ch))) {
1093                 carpstats.carps_badsum++;
1094                 CARP_LOG("carp6_proto_input: checksum failed, on %s\n",
1095                     ifp->if_xname);
1096                 m_freem(m);
1097                 goto back;
1098         }
1099
1100         carp_proto_input_c(sc, m, ch, AF_INET6);
1101 back:
1102         return (IPPROTO_DONE);
1103 }
1104 #endif /* INET6 */
1105
1106 static void
1107 carp_proto_input_c(struct carp_softc *sc, struct mbuf *m,
1108     struct carp_header *ch, sa_family_t af)
1109 {
1110         struct ifnet *cifp;
1111         uint64_t tmp_counter;
1112         struct timeval sc_tv, ch_tv;
1113
1114         if (sc->sc_vhid != ch->carp_vhid) {
1115                 /*
1116                  * CARP uses multicast, however, multicast packets
1117                  * are tapped to all CARP interfaces on the physical
1118                  * interface receiving the CARP packets, so we don't
1119                  * update any stats here.
1120                  */
1121                 m_freem(m);
1122                 return;
1123         }
1124         cifp = &sc->sc_if;
1125
1126         /* verify the CARP version. */
1127         if (ch->carp_version != CARP_VERSION) {
1128                 carpstats.carps_badver++;
1129                 CARP_LOG("%s; invalid version %d\n", cifp->if_xname,
1130                          ch->carp_version);
1131                 m_freem(m);
1132                 return;
1133         }
1134
1135         /* verify the hash */
1136         if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
1137                 carpstats.carps_badauth++;
1138                 CARP_LOG("%s: incorrect hash\n", cifp->if_xname);
1139                 m_freem(m);
1140                 return;
1141         }
1142
1143         tmp_counter = ntohl(ch->carp_counter[0]);
1144         tmp_counter = tmp_counter<<32;
1145         tmp_counter += ntohl(ch->carp_counter[1]);
1146
1147         /* XXX Replay protection goes here */
1148
1149         sc->sc_init_counter = 0;
1150         sc->sc_counter = tmp_counter;
1151
1152         sc_tv.tv_sec = sc->sc_advbase;
1153         if (carp_suppress_preempt && sc->sc_advskew <  240)
1154                 sc_tv.tv_usec = 240 * 1000000 / 256;
1155         else
1156                 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1157         ch_tv.tv_sec = ch->carp_advbase;
1158         ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
1159
1160         switch (sc->sc_state) {
1161         case INIT:
1162                 break;
1163
1164         case MASTER:
1165                 /*
1166                  * If we receive an advertisement from a master who's going to
1167                  * be more frequent than us, go into BACKUP state.
1168                  */
1169                 if (timevalcmp(&sc_tv, &ch_tv, >) ||
1170                     timevalcmp(&sc_tv, &ch_tv, ==)) {
1171                         callout_stop(&sc->sc_ad_tmo);
1172                         CARP_DEBUG("%s: MASTER -> BACKUP "
1173                            "(more frequent advertisement received)\n",
1174                            cifp->if_xname);
1175                         carp_set_state(sc, BACKUP);
1176                         carp_setrun(sc, 0);
1177                         if (carp_opts[CARPCTL_SETROUTE])
1178                                 carp_setroute(sc, RTM_DELETE);
1179                 }
1180                 break;
1181
1182         case BACKUP:
1183                 /*
1184                  * If we're pre-empting masters who advertise slower than us,
1185                  * and this one claims to be slower, treat him as down.
1186                  */
1187                 if (carp_opts[CARPCTL_PREEMPT] &&
1188                     timevalcmp(&sc_tv, &ch_tv, <)) {
1189                         CARP_DEBUG("%s: BACKUP -> MASTER "
1190                             "(preempting a slower master)\n", cifp->if_xname);
1191                         carp_master_down(sc);
1192                         break;
1193                 }
1194
1195                 /*
1196                  *  If the master is going to advertise at such a low frequency
1197                  *  that he's guaranteed to time out, we'd might as well just
1198                  *  treat him as timed out now.
1199                  */
1200                 sc_tv.tv_sec = sc->sc_advbase * 3;
1201                 if (timevalcmp(&sc_tv, &ch_tv, <)) {
1202                         CARP_DEBUG("%s: BACKUP -> MASTER (master timed out)\n",
1203                                    cifp->if_xname);
1204                         carp_master_down(sc);
1205                         break;
1206                 }
1207
1208                 /*
1209                  * Otherwise, we reset the counter and wait for the next
1210                  * advertisement.
1211                  */
1212                 carp_setrun(sc, af);
1213                 break;
1214         }
1215         m_freem(m);
1216 }
1217
1218 struct mbuf *
1219 carp_input(void *v, struct mbuf *m)
1220 {
1221         struct carp_if *cif = v;
1222         struct ether_header *eh;
1223         struct carp_softc_container *scc;
1224         struct ifnet *ifp;
1225
1226         eh = mtod(m, struct ether_header *);
1227
1228         ifp = carp_forus(cif, eh->ether_dhost);
1229         if (ifp != NULL) {
1230                 ether_reinput_oncpu(ifp, m, REINPUT_RUNBPF);
1231                 return NULL;
1232         }
1233
1234         if ((m->m_flags & (M_BCAST | M_MCAST)) == 0)
1235                 return m;
1236
1237         /*
1238          * XXX Should really check the list of multicast addresses
1239          * for each CARP interface _before_ copying.
1240          */
1241         TAILQ_FOREACH(scc, cif, scc_link) {
1242                 struct carp_softc *sc = scc->scc_softc;
1243                 struct mbuf *m0;
1244
1245                 if ((sc->sc_if.if_flags & IFF_UP) == 0)
1246                         continue;
1247
1248                 m0 = m_dup(m, M_NOWAIT);
1249                 if (m0 == NULL)
1250                         continue;
1251
1252                 ether_reinput_oncpu(&sc->sc_if, m0, REINPUT_RUNBPF);
1253         }
1254         return m;
1255 }
1256
1257 static void
1258 carp_prepare_ad(struct carp_softc *sc, struct carp_header *ch)
1259 {
1260         if (sc->sc_init_counter) {
1261                 /* this could also be seconds since unix epoch */
1262                 sc->sc_counter = karc4random();
1263                 sc->sc_counter = sc->sc_counter << 32;
1264                 sc->sc_counter += karc4random();
1265         } else {
1266                 sc->sc_counter++;
1267         }
1268
1269         ch->carp_counter[0] = htonl((sc->sc_counter >> 32) & 0xffffffff);
1270         ch->carp_counter[1] = htonl(sc->sc_counter & 0xffffffff);
1271
1272         carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
1273 }
1274
1275 static void
1276 carp_send_ad_all(void)
1277 {
1278         struct carp_softc *sc;
1279
1280         LIST_FOREACH(sc, &carpif_list, sc_next) {
1281                 if (sc->sc_carpdev == NULL)
1282                         continue;
1283
1284                 if (CARP_IS_RUNNING(&sc->sc_if) && sc->sc_state == MASTER)
1285                         carp_send_ad(sc);
1286         }
1287 }
1288
1289 static void
1290 carp_send_ad_timeout(void *xsc)
1291 {
1292         struct carp_softc *sc = xsc;
1293         struct netmsg_carp *cmsg = &sc->sc_ad_msg;
1294
1295         KASSERT(mycpuid == 0, ("%s not on cpu0 but on cpu%d",
1296             __func__, mycpuid));
1297
1298         crit_enter();
1299         if (cmsg->base.lmsg.ms_flags & MSGF_DONE)
1300                 lwkt_sendmsg_oncpu(netisr_cpuport(0), &cmsg->base.lmsg);
1301         crit_exit();
1302 }
1303
1304 static void
1305 carp_send_ad_timeout_dispatch(netmsg_t msg)
1306 {
1307         struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
1308         struct carp_softc *sc = cmsg->nc_softc;
1309
1310         /* Reply ASAP */
1311         crit_enter();
1312         lwkt_replymsg(&cmsg->base.lmsg, 0);
1313         crit_exit();
1314
1315         carp_send_ad(sc);
1316 }
1317
1318 static void
1319 carp_send_ad(struct carp_softc *sc)
1320 {
1321         struct ifnet *cifp = &sc->sc_if;
1322         struct carp_header ch;
1323         struct timeval tv;
1324         struct carp_header *ch_ptr;
1325         struct mbuf *m;
1326         int len, advbase, advskew;
1327
1328         if (!CARP_IS_RUNNING(cifp)) {
1329                 /* Bow out */
1330                 advbase = 255;
1331                 advskew = 255;
1332         } else {
1333                 advbase = sc->sc_advbase;
1334                 if (!carp_suppress_preempt || sc->sc_advskew > 240)
1335                         advskew = sc->sc_advskew;
1336                 else
1337                         advskew = 240;
1338                 tv.tv_sec = advbase;
1339                 tv.tv_usec = advskew * 1000000 / 256;
1340         }
1341
1342         ch.carp_version = CARP_VERSION;
1343         ch.carp_type = CARP_ADVERTISEMENT;
1344         ch.carp_vhid = sc->sc_vhid;
1345         ch.carp_advbase = advbase;
1346         ch.carp_advskew = advskew;
1347         ch.carp_authlen = 7;    /* XXX DEFINE */
1348         ch.carp_pad1 = 0;       /* must be zero */
1349         ch.carp_cksum = 0;
1350
1351 #ifdef INET
1352         if (sc->sc_ia != NULL) {
1353                 struct ip *ip;
1354
1355                 MGETHDR(m, M_NOWAIT, MT_HEADER);
1356                 if (m == NULL) {
1357                         IFNET_STAT_INC(cifp, oerrors, 1);
1358                         carpstats.carps_onomem++;
1359                         /* XXX maybe less ? */
1360                         if (advbase != 255 || advskew != 255)
1361                                 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1362                                     carp_send_ad_timeout, sc);
1363                         return;
1364                 }
1365                 len = sizeof(*ip) + sizeof(ch);
1366                 m->m_pkthdr.len = len;
1367                 m->m_pkthdr.rcvif = NULL;
1368                 m->m_len = len;
1369                 MH_ALIGN(m, m->m_len);
1370                 m->m_flags |= M_MCAST;
1371                 if (carp_prio_ad)
1372                         m->m_flags |= M_PRIO;
1373                 ip = mtod(m, struct ip *);
1374                 ip->ip_v = IPVERSION;
1375                 ip->ip_hl = sizeof(*ip) >> 2;
1376                 ip->ip_tos = IPTOS_LOWDELAY;
1377                 ip->ip_len = len;
1378                 ip->ip_id = ip_newid();
1379                 ip->ip_off = IP_DF;
1380                 ip->ip_ttl = CARP_DFLTTL;
1381                 ip->ip_p = IPPROTO_CARP;
1382                 ip->ip_sum = 0;
1383                 ip->ip_src = sc->sc_ia->ia_addr.sin_addr;
1384                 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
1385
1386                 ch_ptr = (struct carp_header *)(&ip[1]);
1387                 bcopy(&ch, ch_ptr, sizeof(ch));
1388                 carp_prepare_ad(sc, ch_ptr);
1389                 ch_ptr->carp_cksum = in_cksum_skip(m, len, sizeof(*ip));
1390
1391                 getmicrotime(&cifp->if_lastchange);
1392                 IFNET_STAT_INC(cifp, opackets, 1);
1393                 IFNET_STAT_INC(cifp, obytes, len);
1394                 carpstats.carps_opackets++;
1395
1396                 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) {
1397                         IFNET_STAT_INC(cifp, oerrors, 1);
1398                         if (sc->sc_sendad_errors < INT_MAX)
1399                                 sc->sc_sendad_errors++;
1400                         if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1401                                 carp_suppress_preempt++;
1402                                 if (carp_suppress_preempt == 1) {
1403                                         carp_send_ad_all();
1404                                 }
1405                         }
1406                         sc->sc_sendad_success = 0;
1407                 } else {
1408                         if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1409                                 if (++sc->sc_sendad_success >=
1410                                     CARP_SENDAD_MIN_SUCCESS) {
1411                                         carp_suppress_preempt--;
1412                                         sc->sc_sendad_errors = 0;
1413                                 }
1414                         } else {
1415                                 sc->sc_sendad_errors = 0;
1416                         }
1417                 }
1418         }
1419 #endif /* INET */
1420 #ifdef INET6
1421         if (sc->sc_ia6) {
1422                 struct ip6_hdr *ip6;
1423
1424                 MGETHDR(m, M_NOWAIT, MT_HEADER);
1425                 if (m == NULL) {
1426                         IFNET_STAT_INC(cifp, oerrors, 1);
1427                         carpstats.carps_onomem++;
1428                         /* XXX maybe less ? */
1429                         if (advbase != 255 || advskew != 255)
1430                                 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1431                                     carp_send_ad_timeout, sc);
1432                         return;
1433                 }
1434                 len = sizeof(*ip6) + sizeof(ch);
1435                 m->m_pkthdr.len = len;
1436                 m->m_pkthdr.rcvif = NULL;
1437                 m->m_len = len;
1438                 MH_ALIGN(m, m->m_len);
1439                 m->m_flags |= M_MCAST;
1440                 ip6 = mtod(m, struct ip6_hdr *);
1441                 bzero(ip6, sizeof(*ip6));
1442                 ip6->ip6_vfc |= IPV6_VERSION;
1443                 ip6->ip6_hlim = CARP_DFLTTL;
1444                 ip6->ip6_nxt = IPPROTO_CARP;
1445                 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src,
1446                     sizeof(struct in6_addr));
1447                 /* set the multicast destination */
1448
1449                 ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
1450                 ip6->ip6_dst.s6_addr8[15] = 0x12;
1451                 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
1452                         IFNET_STAT_INC(cifp, oerrors, 1);
1453                         m_freem(m);
1454                         CARP_LOG("%s: in6_setscope failed\n", __func__);
1455                         return;
1456                 }
1457
1458                 ch_ptr = (struct carp_header *)(&ip6[1]);
1459                 bcopy(&ch, ch_ptr, sizeof(ch));
1460                 carp_prepare_ad(sc, ch_ptr);
1461                 ch_ptr->carp_cksum = in_cksum_skip(m, len, sizeof(*ip6));
1462
1463                 getmicrotime(&cifp->if_lastchange);
1464                 IFNET_STAT_INC(cifp, opackets, 1);
1465                 IFNET_STAT_INC(cifp, obytes, len);
1466                 carpstats.carps_opackets6++;
1467
1468                 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) {
1469                         IFNET_STAT_INC(cifp, oerrors, 1);
1470                         if (sc->sc_sendad_errors < INT_MAX)
1471                                 sc->sc_sendad_errors++;
1472                         if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1473                                 carp_suppress_preempt++;
1474                                 if (carp_suppress_preempt == 1) {
1475                                         carp_send_ad_all();
1476                                 }
1477                         }
1478                         sc->sc_sendad_success = 0;
1479                 } else {
1480                         if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1481                                 if (++sc->sc_sendad_success >=
1482                                     CARP_SENDAD_MIN_SUCCESS) {
1483                                         carp_suppress_preempt--;
1484                                         sc->sc_sendad_errors = 0;
1485                                 }
1486                         } else {
1487                                 sc->sc_sendad_errors = 0;
1488                         }
1489                 }
1490         }
1491 #endif /* INET6 */
1492
1493         if (advbase != 255 || advskew != 255)
1494                 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1495                     carp_send_ad_timeout, sc);
1496 }
1497
1498 /*
1499  * Broadcast a gratuitous ARP request containing
1500  * the virtual router MAC address for each IP address
1501  * associated with the virtual router.
1502  */
1503 static void
1504 carp_send_arp(struct carp_softc *sc)
1505 {
1506         const struct carp_vhaddr *vha;
1507
1508         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1509                 if (vha->vha_iaback == NULL)
1510                         continue;
1511                 arp_gratuitous(&sc->sc_if, &vha->vha_ia->ia_ifa);
1512         }
1513 }
1514
1515 #ifdef INET6
1516 static void
1517 carp_send_na(struct carp_softc *sc)
1518 {
1519         struct ifaddr_container *ifac;
1520         struct in6_addr *in6;
1521         static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1522
1523         TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
1524                 struct ifaddr *ifa = ifac->ifa;
1525
1526                 if (ifa->ifa_addr->sa_family != AF_INET6)
1527                         continue;
1528
1529                 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
1530                 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1531                     ND_NA_FLAG_OVERRIDE, 1, NULL);
1532                 DELAY(1000);    /* XXX */
1533         }
1534 }
1535 #endif /* INET6 */
1536
1537 static __inline const struct carp_vhaddr *
1538 carp_find_addr(const struct carp_softc *sc, const struct in_addr *addr)
1539 {
1540         struct carp_vhaddr *vha;
1541
1542         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1543                 if (vha->vha_iaback == NULL)
1544                         continue;
1545
1546                 if (vha->vha_ia->ia_addr.sin_addr.s_addr == addr->s_addr)
1547                         return vha;
1548         }
1549         return NULL;
1550 }
1551
1552 #ifdef notyet
1553 static int
1554 carp_iamatch_balance(const struct carp_if *cif, const struct in_addr *itaddr,
1555                      const struct in_addr *isaddr, uint8_t **enaddr)
1556 {
1557         const struct carp_softc *vh;
1558         int index, count = 0;
1559
1560         /*
1561          * XXX proof of concept implementation.
1562          * We use the source ip to decide which virtual host should
1563          * handle the request. If we're master of that virtual host,
1564          * then we respond, otherwise, just drop the arp packet on
1565          * the floor.
1566          */
1567
1568         TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1569                 if (!CARP_IS_RUNNING(&vh->sc_if))
1570                         continue;
1571
1572                 if (carp_find_addr(vh, itaddr) != NULL)
1573                         count++;
1574         }
1575         if (count == 0)
1576                 return 0;
1577
1578         /* this should be a hash, like pf_hash() */
1579         index = ntohl(isaddr->s_addr) % count;
1580         count = 0;
1581
1582         TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1583                 if (!CARP_IS_RUNNING(&vh->sc_if))
1584                         continue;
1585
1586                 if (carp_find_addr(vh, itaddr) == NULL)
1587                         continue;
1588
1589                 if (count == index) {
1590                         if (vh->sc_state == MASTER) {
1591                                 *enaddr = IF_LLADDR(&vh->sc_if);
1592                                 return 1;
1593                         } else {
1594                                 return 0;
1595                         }
1596                 }
1597                 count++;
1598         }
1599         return 0;
1600 }
1601 #endif
1602
1603 int
1604 carp_iamatch(const struct in_ifaddr *ia)
1605 {
1606         const struct carp_softc *sc = ia->ia_ifp->if_softc;
1607
1608         ASSERT_NETISR0;
1609
1610 #ifdef notyet
1611         if (carp_opts[CARPCTL_ARPBALANCE])
1612                 return carp_iamatch_balance(cif, itaddr, isaddr, enaddr);
1613 #endif
1614
1615         if (!CARP_IS_RUNNING(&sc->sc_if) || sc->sc_state != MASTER)
1616                 return 0;
1617
1618         return 1;
1619 }
1620
1621 #ifdef INET6
1622 struct ifaddr *
1623 carp_iamatch6(void *v, struct in6_addr *taddr)
1624 {
1625 #ifdef foo
1626         struct carp_if *cif = v;
1627         struct carp_softc *vh;
1628
1629         TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1630                 struct ifaddr_container *ifac;
1631
1632                 TAILQ_FOREACH(ifac, &vh->sc_if.if_addrheads[mycpuid],
1633                               ifa_link) {
1634                         struct ifaddr *ifa = ifac->ifa;
1635
1636                         if (IN6_ARE_ADDR_EQUAL(taddr,
1637                             &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1638                             CARP_IS_RUNNING(&vh->sc_if) &&
1639                             vh->sc_state == MASTER) {
1640                                 return (ifa);
1641                         }
1642                 }
1643         }
1644 #endif
1645         return (NULL);
1646 }
1647
1648 void *
1649 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr)
1650 {
1651 #ifdef foo
1652         struct m_tag *mtag;
1653         struct carp_if *cif = v;
1654         struct carp_softc *sc;
1655
1656         TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
1657                 struct ifaddr_container *ifac;
1658
1659                 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid],
1660                               ifa_link) {
1661                         struct ifaddr *ifa = ifac->ifa;
1662
1663                         if (IN6_ARE_ADDR_EQUAL(taddr,
1664                             &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1665                             CARP_IS_RUNNING(&sc->sc_if)) {
1666                                 struct ifnet *ifp = &sc->sc_if;
1667
1668                                 mtag = m_tag_get(PACKET_TAG_CARP,
1669                                     sizeof(struct ifnet *), M_NOWAIT);
1670                                 if (mtag == NULL) {
1671                                         /* better a bit than nothing */
1672                                         return (IF_LLADDR(ifp));
1673                                 }
1674                                 bcopy(&ifp, (caddr_t)(mtag + 1),
1675                                     sizeof(struct ifnet *));
1676                                 m_tag_prepend(m, mtag);
1677
1678                                 return (IF_LLADDR(ifp));
1679                         }
1680                 }
1681         }
1682 #endif
1683         return (NULL);
1684 }
1685 #endif
1686
1687 static struct ifnet *
1688 carp_forus(struct carp_if *cif, const uint8_t *dhost)
1689 {
1690         struct carp_softc_container *scc;
1691
1692         if (memcmp(dhost, carp_etheraddr, ETHER_ADDR_LEN - 1) != 0)
1693                 return NULL;
1694
1695         TAILQ_FOREACH(scc, cif, scc_link) {
1696                 struct carp_softc *sc = scc->scc_softc;
1697                 struct ifnet *ifp = &sc->sc_if;
1698
1699                 if (CARP_IS_RUNNING(ifp) && sc->sc_state == MASTER &&
1700                     !bcmp(dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN))
1701                         return ifp;
1702         }
1703         return NULL;
1704 }
1705
1706 static void
1707 carp_master_down_timeout(void *xsc)
1708 {
1709         struct carp_softc *sc = xsc;
1710         struct netmsg_carp *cmsg = &sc->sc_md_msg;
1711
1712         KASSERT(mycpuid == 0, ("%s not on cpu0 but on cpu%d",
1713             __func__, mycpuid));
1714
1715         crit_enter();
1716         if (cmsg->base.lmsg.ms_flags & MSGF_DONE)
1717                 lwkt_sendmsg_oncpu(netisr_cpuport(0), &cmsg->base.lmsg);
1718         crit_exit();
1719 }
1720
1721 static void
1722 carp_master_down_timeout_dispatch(netmsg_t msg)
1723 {
1724         struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
1725         struct carp_softc *sc = cmsg->nc_softc;
1726
1727         /* Reply ASAP */
1728         crit_enter();
1729         lwkt_replymsg(&cmsg->base.lmsg, 0);
1730         crit_exit();
1731
1732         CARP_DEBUG("%s: BACKUP -> MASTER (master timed out)\n",
1733                    sc->sc_if.if_xname);
1734         carp_master_down(sc);
1735 }
1736
1737 static void
1738 carp_master_down(struct carp_softc *sc)
1739 {
1740         switch (sc->sc_state) {
1741         case INIT:
1742                 kprintf("%s: master_down event in INIT state\n",
1743                         sc->sc_if.if_xname);
1744                 break;
1745
1746         case MASTER:
1747                 break;
1748
1749         case BACKUP:
1750                 carp_set_state(sc, MASTER);
1751                 carp_send_ad(sc);
1752                 carp_send_arp(sc);
1753 #ifdef INET6
1754                 carp_send_na(sc);
1755 #endif /* INET6 */
1756                 carp_setrun(sc, 0);
1757                 if (carp_opts[CARPCTL_SETROUTE])
1758                         carp_setroute(sc, RTM_ADD);
1759                 break;
1760         }
1761 }
1762
1763 /*
1764  * When in backup state, af indicates whether to reset the master down timer
1765  * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1766  */
1767 static void
1768 carp_setrun(struct carp_softc *sc, sa_family_t af)
1769 {
1770         struct ifnet *cifp = &sc->sc_if;
1771         struct timeval tv;
1772
1773         if (sc->sc_carpdev == NULL) {
1774                 carp_set_state(sc, INIT);
1775                 return;
1776         }
1777
1778         if ((cifp->if_flags & IFF_RUNNING) && sc->sc_vhid > 0 &&
1779             (sc->sc_naddrs || sc->sc_naddrs6)) {
1780                 /* Nothing */
1781         } else {
1782                 if (carp_opts[CARPCTL_SETROUTE])
1783                         carp_setroute(sc, RTM_DELETE);
1784                 return;
1785         }
1786
1787         switch (sc->sc_state) {
1788         case INIT:
1789                 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) {
1790                         carp_send_ad(sc);
1791                         carp_send_arp(sc);
1792 #ifdef INET6
1793                         carp_send_na(sc);
1794 #endif /* INET6 */
1795                         CARP_DEBUG("%s: INIT -> MASTER (preempting)\n",
1796                                    cifp->if_xname);
1797                         carp_set_state(sc, MASTER);
1798                         if (carp_opts[CARPCTL_SETROUTE])
1799                                 carp_setroute(sc, RTM_ADD);
1800                 } else {
1801                         CARP_DEBUG("%s: INIT -> BACKUP\n", cifp->if_xname);
1802                         carp_set_state(sc, BACKUP);
1803                         if (carp_opts[CARPCTL_SETROUTE])
1804                                 carp_setroute(sc, RTM_DELETE);
1805                         carp_setrun(sc, 0);
1806                 }
1807                 break;
1808
1809         case BACKUP:
1810                 callout_stop(&sc->sc_ad_tmo);
1811                 tv.tv_sec = 3 * sc->sc_advbase;
1812                 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1813                 switch (af) {
1814 #ifdef INET
1815                 case AF_INET:
1816                         callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
1817                             carp_master_down_timeout, sc);
1818                         break;
1819 #endif /* INET */
1820 #ifdef INET6
1821                 case AF_INET6:
1822                         callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
1823                             carp_master_down_timeout, sc);
1824                         break;
1825 #endif /* INET6 */
1826                 default:
1827                         if (sc->sc_naddrs)
1828                                 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
1829                                     carp_master_down_timeout, sc);
1830                         if (sc->sc_naddrs6)
1831                                 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
1832                                     carp_master_down_timeout, sc);
1833                         break;
1834                 }
1835                 break;
1836
1837         case MASTER:
1838                 tv.tv_sec = sc->sc_advbase;
1839                 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1840                 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1841                     carp_send_ad_timeout, sc);
1842                 break;
1843         }
1844 }
1845
1846 static void
1847 carp_multicast_cleanup(struct carp_softc *sc)
1848 {
1849         struct ip_moptions *imo = &sc->sc_imo;
1850
1851         if (imo->imo_num_memberships == 0)
1852                 return;
1853         KKASSERT(imo->imo_num_memberships == 1);
1854
1855         in_delmulti(imo->imo_membership[0]);
1856         imo->imo_membership[0] = NULL;
1857         imo->imo_num_memberships = 0;
1858         imo->imo_multicast_ifp = NULL;
1859 }
1860
1861 #ifdef INET6
1862 static void
1863 carp_multicast6_cleanup(struct carp_softc *sc)
1864 {
1865         struct ip6_moptions *im6o = &sc->sc_im6o;
1866
1867         while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1868                 struct in6_multi_mship *imm =
1869                     LIST_FIRST(&im6o->im6o_memberships);
1870
1871                 LIST_REMOVE(imm, i6mm_chain);
1872                 in6_leavegroup(imm);
1873         }
1874         im6o->im6o_multicast_ifp = NULL;
1875 }
1876 #endif
1877
1878 static void
1879 carp_ioctl_getvhaddr_dispatch(netmsg_t msg)
1880 {
1881         struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
1882         struct carp_softc *sc = cmsg->nc_softc;
1883         const struct carp_vhaddr *vha;
1884         struct ifcarpvhaddr *carpa, *carpa0;
1885         int count, len, error = 0;
1886
1887         count = 0;
1888         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
1889                 ++count;
1890
1891         if (cmsg->nc_datalen == 0) {
1892                 cmsg->nc_datalen = count * sizeof(*carpa);
1893                 goto back;
1894         } else if (count == 0 || cmsg->nc_datalen < sizeof(*carpa)) {
1895                 cmsg->nc_datalen = 0;
1896                 goto back;
1897         }
1898         len = min(cmsg->nc_datalen, sizeof(*carpa) * count);
1899         KKASSERT(len >= sizeof(*carpa));
1900
1901         carpa0 = carpa = kmalloc(len, M_TEMP, M_WAITOK | M_NULLOK | M_ZERO);
1902         if (carpa == NULL) {
1903                 error = ENOMEM;
1904                 goto back;
1905         }
1906
1907         count = 0;
1908         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1909                 if (len < sizeof(*carpa))
1910                         break;
1911
1912                 carpa->carpa_flags = vha->vha_flags;
1913                 carpa->carpa_addr.sin_family = AF_INET;
1914                 carpa->carpa_addr.sin_addr = vha->vha_ia->ia_addr.sin_addr;
1915
1916                 carpa->carpa_baddr.sin_family = AF_INET;
1917                 if (vha->vha_iaback == NULL) {
1918                         carpa->carpa_baddr.sin_addr.s_addr = INADDR_ANY;
1919                 } else {
1920                         carpa->carpa_baddr.sin_addr =
1921                         vha->vha_iaback->ia_addr.sin_addr;
1922                 }
1923
1924                 ++carpa;
1925                 ++count;
1926                 len -= sizeof(*carpa);
1927         }
1928         cmsg->nc_datalen = sizeof(*carpa) * count;
1929         KKASSERT(cmsg->nc_datalen > 0);
1930
1931         cmsg->nc_data = carpa0;
1932
1933 back:
1934         lwkt_replymsg(&cmsg->base.lmsg, error);
1935 }
1936
1937 static int
1938 carp_ioctl_getvhaddr(struct carp_softc *sc, struct ifdrv *ifd)
1939 {
1940         struct ifnet *ifp = &sc->arpcom.ac_if;
1941         struct netmsg_carp cmsg;
1942         int error;
1943
1944         ASSERT_IFNET_SERIALIZED_ALL(ifp);
1945         ifnet_deserialize_all(ifp);
1946
1947         bzero(&cmsg, sizeof(cmsg));
1948         netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
1949             carp_ioctl_getvhaddr_dispatch);
1950         cmsg.nc_softc = sc;
1951         cmsg.nc_datalen = ifd->ifd_len;
1952
1953         error = lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
1954
1955         if (!error) {
1956                 if (cmsg.nc_data != NULL) {
1957                         error = copyout(cmsg.nc_data, ifd->ifd_data,
1958                             cmsg.nc_datalen);
1959                         kfree(cmsg.nc_data, M_TEMP);
1960                 }
1961                 ifd->ifd_len = cmsg.nc_datalen;
1962         } else {
1963                 KASSERT(cmsg.nc_data == NULL,
1964                     ("%s temp vhaddr is alloc upon error", __func__));
1965         }
1966
1967         ifnet_serialize_all(ifp);
1968         return error;
1969 }
1970
1971 static int
1972 carp_config_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
1973     struct in_ifaddr *ia_del)
1974 {
1975         struct ifnet *ifp;
1976         struct in_ifaddr *ia_if;
1977         const struct in_ifaddr *ia_vha;
1978         struct in_ifaddr_container *iac;
1979         int own, ia_match_carpdev;
1980
1981         KKASSERT(vha->vha_ia != NULL);
1982         ia_vha = vha->vha_ia;
1983
1984         ia_if = NULL;
1985         own = 0;
1986         ia_match_carpdev = 0;
1987         TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1988                 struct in_ifaddr *ia = iac->ia;
1989
1990                 if (ia == ia_del)
1991                         continue;
1992
1993                 if (ia->ia_ifp->if_type == IFT_CARP)
1994                         continue;
1995
1996                 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
1997                         continue;
1998
1999                 /* and, yeah, we need a multicast-capable iface too */
2000                 if ((ia->ia_ifp->if_flags & IFF_MULTICAST) == 0)
2001                         continue;
2002
2003                 if (ia_vha->ia_subnetmask == ia->ia_subnetmask &&
2004                     ia_vha->ia_subnet == ia->ia_subnet) {
2005                         if (ia_vha->ia_addr.sin_addr.s_addr ==
2006                             ia->ia_addr.sin_addr.s_addr)
2007                                 own = 1;
2008                         if (ia_if == NULL) {
2009                                 ia_if = ia;
2010                         } else if (sc->sc_carpdev != NULL &&
2011                             sc->sc_carpdev == ia->ia_ifp) {
2012                                 ia_if = ia;
2013                                 if (ia_if->ia_flags & IFA_ROUTE) {
2014                                         /*
2015                                          * Address with prefix route
2016                                          * is prefered
2017                                          */
2018                                         break;
2019                                 }
2020                                 ia_match_carpdev = 1;
2021                         } else if (!ia_match_carpdev) {
2022                                 if (ia->ia_flags & IFA_ROUTE) {
2023                                         /*
2024                                          * Address with prefix route
2025                                          * is prefered over others.
2026                                          */
2027                                         ia_if = ia;
2028                                 }
2029                         }
2030                 }
2031         }
2032
2033         carp_deactivate_vhaddr(sc, vha, FALSE);
2034         if (!ia_if)
2035                 return ENOENT;
2036
2037         ifp = ia_if->ia_ifp;
2038
2039         /* XXX Don't allow parent iface to be changed */
2040         if (sc->sc_carpdev != NULL && sc->sc_carpdev != ifp)
2041                 return EEXIST;
2042
2043         return carp_activate_vhaddr(sc, vha, ifp, ia_if, own);
2044 }
2045
2046 static void
2047 carp_add_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
2048 {
2049         struct carp_vhaddr *vha_new;
2050         struct in_ifaddr *carp_ia;
2051 #ifdef INVARIANTS
2052         struct carp_vhaddr *vha;
2053 #endif
2054
2055         KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
2056         carp_ia = ifatoia(carp_ifa);
2057
2058 #ifdef INVARIANTS
2059         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
2060                 KKASSERT(vha->vha_ia != NULL && vha->vha_ia != carp_ia);
2061 #endif
2062
2063         vha_new = kmalloc(sizeof(*vha_new), M_CARP, M_WAITOK | M_ZERO);
2064         vha_new->vha_ia = carp_ia;
2065         carp_insert_vhaddr(sc, vha_new);
2066
2067         if (carp_config_vhaddr(sc, vha_new, NULL) != 0) {
2068                 /*
2069                  * If the above configuration fails, it may only mean
2070                  * that the new address is problematic.  However, the
2071                  * carp(4) interface may already have several working
2072                  * addresses.  Since the expected behaviour of
2073                  * SIOC[AS]IFADDR is to put the NIC into working state,
2074                  * we try starting the state machine manually here with
2075                  * the hope that the carp(4)'s previously working
2076                  * addresses still could be brought up.
2077                  */
2078                 carp_hmac_prepare(sc);
2079                 carp_set_state(sc, INIT);
2080                 carp_setrun(sc, 0);
2081         }
2082 }
2083
2084 static void
2085 carp_del_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
2086 {
2087         struct carp_vhaddr *vha;
2088         struct in_ifaddr *carp_ia;
2089
2090         KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
2091         carp_ia = ifatoia(carp_ifa);
2092
2093         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
2094                 KKASSERT(vha->vha_ia != NULL);
2095                 if (vha->vha_ia == carp_ia)
2096                         break;
2097         }
2098         KASSERT(vha != NULL, ("no corresponding vhaddr %p", carp_ifa));
2099
2100         /*
2101          * Remove the vhaddr from the list before deactivating
2102          * the vhaddr, so that the HMAC could be correctly
2103          * updated in carp_deactivate_vhaddr()
2104          */
2105         carp_remove_vhaddr(sc, vha);
2106
2107         carp_deactivate_vhaddr(sc, vha, FALSE);
2108         kfree(vha, M_CARP);
2109 }
2110
2111 static void
2112 carp_config_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
2113 {
2114         struct carp_vhaddr *vha;
2115         struct in_ifaddr *carp_ia;
2116
2117         KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
2118         carp_ia = ifatoia(carp_ifa);
2119
2120         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
2121                 KKASSERT(vha->vha_ia != NULL);
2122                 if (vha->vha_ia == carp_ia)
2123                         break;
2124         }
2125         KASSERT(vha != NULL, ("no corresponding vhaddr %p", carp_ifa));
2126
2127         /* Remove then reinsert, to keep the vhaddr list sorted */
2128         carp_remove_vhaddr(sc, vha);
2129         carp_insert_vhaddr(sc, vha);
2130
2131         if (carp_config_vhaddr(sc, vha, NULL) != 0) {
2132                 /* See the comment in carp_add_addr() */
2133                 carp_hmac_prepare(sc);
2134                 carp_set_state(sc, INIT);
2135                 carp_setrun(sc, 0);
2136         }
2137 }
2138
2139 #ifdef notyet
2140
2141 #ifdef INET6
2142 static int
2143 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
2144 {
2145         struct ifnet *ifp;
2146         struct carp_if *cif;
2147         struct in6_ifaddr *ia, *ia_if;
2148         struct ip6_moptions *im6o = &sc->sc_im6o;
2149         struct in6_multi_mship *imm;
2150         struct in6_addr in6;
2151         int own, error;
2152
2153         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
2154                 carp_setrun(sc, 0);
2155                 return (0);
2156         }
2157
2158         /* we have to do it by hands to check we won't match on us */
2159         ia_if = NULL; own = 0;
2160         for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
2161                 int i;
2162
2163                 for (i = 0; i < 4; i++) {
2164                         if ((sin6->sin6_addr.s6_addr32[i] &
2165                             ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
2166                             (ia->ia_addr.sin6_addr.s6_addr32[i] &
2167                             ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
2168                                 break;
2169                 }
2170                 /* and, yeah, we need a multicast-capable iface too */
2171                 if (ia->ia_ifp != &sc->sc_if &&
2172                     (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
2173                     (i == 4)) {
2174                         if (!ia_if)
2175                                 ia_if = ia;
2176                         if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2177                             &ia->ia_addr.sin6_addr))
2178                                 own++;
2179                 }
2180         }
2181
2182         if (!ia_if)
2183                 return (EADDRNOTAVAIL);
2184         ia = ia_if;
2185         ifp = ia->ia_ifp;
2186
2187         if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
2188             (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp))
2189                 return (EADDRNOTAVAIL);
2190
2191         if (!sc->sc_naddrs6) {
2192                 im6o->im6o_multicast_ifp = ifp;
2193
2194                 /* join CARP multicast address */
2195                 bzero(&in6, sizeof(in6));
2196                 in6.s6_addr16[0] = htons(0xff02);
2197                 in6.s6_addr8[15] = 0x12;
2198                 if (in6_setscope(&in6, ifp, NULL) != 0)
2199                         goto cleanup;
2200                 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
2201                         goto cleanup;
2202                 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
2203
2204                 /* join solicited multicast address */
2205                 bzero(&in6, sizeof(in6));
2206                 in6.s6_addr16[0] = htons(0xff02);
2207                 in6.s6_addr32[1] = 0;
2208                 in6.s6_addr32[2] = htonl(1);
2209                 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3];
2210                 in6.s6_addr8[12] = 0xff;
2211                 if (in6_setscope(&in6, ifp, NULL) != 0)
2212                         goto cleanup;
2213                 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
2214                         goto cleanup;
2215                 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
2216         }
2217
2218 #ifdef foo
2219         if (!ifp->if_carp) {
2220                 cif = kmalloc(sizeof(*cif), M_CARP, M_WAITOK | M_ZERO);
2221
2222                 if ((error = ifpromisc(ifp, 1))) {
2223                         kfree(cif, M_CARP);
2224                         goto cleanup;
2225                 }
2226
2227                 TAILQ_INIT(&cif->vhif_vrs);
2228                 ifp->if_carp = cif;
2229         } else {
2230                 struct carp_softc *vr;
2231
2232                 cif = ifp->if_carp;
2233                 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
2234                         if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
2235                                 error = EINVAL;
2236                                 goto cleanup;
2237                         }
2238                 }
2239         }
2240 #endif
2241         sc->sc_ia6 = ia;
2242         sc->sc_carpdev = ifp;
2243
2244 #ifdef foo
2245         { /* XXX prevent endless loop if already in queue */
2246         struct carp_softc *vr, *after = NULL;
2247         int myself = 0;
2248         cif = ifp->if_carp;
2249
2250         TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
2251                 if (vr == sc)
2252                         myself = 1;
2253                 if (vr->sc_vhid < sc->sc_vhid)
2254                         after = vr;
2255         }
2256
2257         if (!myself) {
2258                 /* We're trying to keep things in order */
2259                 if (after == NULL)
2260                         TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
2261                 else
2262                         TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
2263         }
2264         }
2265 #endif
2266
2267         sc->sc_naddrs6++;
2268         if (own)
2269                 sc->sc_advskew = 0;
2270         carp_sc_state(sc);
2271         carp_setrun(sc, 0);
2272
2273         return (0);
2274
2275 cleanup:
2276         /* clean up multicast memberships */
2277         if (!sc->sc_naddrs6) {
2278                 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
2279                         imm = LIST_FIRST(&im6o->im6o_memberships);
2280                         LIST_REMOVE(imm, i6mm_chain);
2281                         in6_leavegroup(imm);
2282                 }
2283         }
2284         return (error);
2285 }
2286
2287 static int
2288 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
2289 {
2290         int error = 0;
2291
2292         if (!--sc->sc_naddrs6) {
2293                 struct carp_if *cif = sc->sc_carpdev->if_carp;
2294                 struct ip6_moptions *im6o = &sc->sc_im6o;
2295
2296                 callout_stop(&sc->sc_ad_tmo);
2297                 sc->sc_vhid = -1;
2298                 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
2299                         struct in6_multi_mship *imm =
2300                             LIST_FIRST(&im6o->im6o_memberships);
2301
2302                         LIST_REMOVE(imm, i6mm_chain);
2303                         in6_leavegroup(imm);
2304                 }
2305                 im6o->im6o_multicast_ifp = NULL;
2306 #ifdef foo
2307                 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
2308                 if (TAILQ_EMPTY(&cif->vhif_vrs)) {
2309                         sc->sc_carpdev->if_carp = NULL;
2310                         kfree(cif, M_IFADDR);
2311                 }
2312 #endif
2313         }
2314         return (error);
2315 }
2316 #endif /* INET6 */
2317
2318 #endif
2319
2320 static int
2321 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr, struct ucred *cr)
2322 {
2323         struct carp_softc *sc = ifp->if_softc;
2324         struct ifreq *ifr = (struct ifreq *)addr;
2325         struct ifdrv *ifd = (struct ifdrv *)addr;
2326         int error = 0;
2327
2328         ASSERT_IFNET_SERIALIZED_ALL(ifp);
2329
2330         switch (cmd) {
2331         case SIOCSIFFLAGS:
2332                 if (ifp->if_flags & IFF_UP) {
2333                         if ((ifp->if_flags & IFF_RUNNING) == 0)
2334                                 carp_init(sc);
2335                 } else if (ifp->if_flags & IFF_RUNNING) {
2336                         carp_ioctl_stop(sc);
2337                 }
2338                 break;
2339
2340         case SIOCSIFCAP:
2341                 carp_ioctl_ifcap(sc, ifr->ifr_reqcap);
2342                 break;
2343
2344         case SIOCSVH:
2345                 error = carp_ioctl_setvh(sc, ifr->ifr_data, cr);
2346                 break;
2347
2348         case SIOCGVH:
2349                 error = carp_ioctl_getvh(sc, ifr->ifr_data, cr);
2350                 break;
2351
2352         case SIOCGDRVSPEC:
2353                 switch (ifd->ifd_cmd) {
2354                 case CARPGDEVNAME:
2355                         error = carp_ioctl_getdevname(sc, ifd);
2356                         break;
2357
2358                 case CARPGVHADDR:
2359                         error = carp_ioctl_getvhaddr(sc, ifd);
2360                         break;
2361
2362                 default:
2363                         error = EINVAL;
2364                         break;
2365                 }
2366                 break;
2367
2368         default:
2369                 error = ether_ioctl(ifp, cmd, addr);
2370                 break;
2371         }
2372
2373         return error;
2374 }
2375
2376 static void
2377 carp_ioctl_stop_dispatch(netmsg_t msg)
2378 {
2379         struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2380         struct carp_softc *sc = cmsg->nc_softc;
2381
2382         carp_stop(sc, FALSE);
2383         lwkt_replymsg(&cmsg->base.lmsg, 0);
2384 }
2385
2386 static void
2387 carp_ioctl_stop(struct carp_softc *sc)
2388 {
2389         struct ifnet *ifp = &sc->arpcom.ac_if;
2390         struct netmsg_carp cmsg;
2391
2392         ASSERT_IFNET_SERIALIZED_ALL(ifp);
2393
2394         ifnet_deserialize_all(ifp);
2395
2396         bzero(&cmsg, sizeof(cmsg));
2397         netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2398             carp_ioctl_stop_dispatch);
2399         cmsg.nc_softc = sc;
2400
2401         lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2402
2403         ifnet_serialize_all(ifp);
2404 }
2405
2406 static void
2407 carp_ioctl_setvh_dispatch(netmsg_t msg)
2408 {
2409         struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2410         struct carp_softc *sc = cmsg->nc_softc;
2411         struct ifnet *ifp = &sc->arpcom.ac_if;
2412         const struct carpreq *carpr = cmsg->nc_data;
2413         int error;
2414
2415         error = 1;
2416         if ((ifp->if_flags & IFF_RUNNING) &&
2417             sc->sc_state != INIT && carpr->carpr_state != sc->sc_state) {
2418                 switch (carpr->carpr_state) {
2419                 case BACKUP:
2420                         callout_stop(&sc->sc_ad_tmo);
2421                         carp_set_state(sc, BACKUP);
2422                         carp_setrun(sc, 0);
2423                         if (carp_opts[CARPCTL_SETROUTE])
2424                                 carp_setroute(sc, RTM_DELETE);
2425                         break;
2426
2427                 case MASTER:
2428                         carp_master_down(sc);
2429                         break;
2430
2431                 default:
2432                         break;
2433                 }
2434         }
2435         if (carpr->carpr_vhid > 0) {
2436                 if (carpr->carpr_vhid > 255) {
2437                         error = EINVAL;
2438                         goto back;
2439                 }
2440                 if (sc->sc_carpdev) {
2441                         struct carp_if *cif = sc->sc_carpdev->if_carp;
2442                         struct carp_softc_container *scc;
2443
2444                         TAILQ_FOREACH(scc, cif, scc_link) {
2445                                 struct carp_softc *vr = scc->scc_softc;
2446
2447                                 if (vr != sc &&
2448                                     vr->sc_vhid == carpr->carpr_vhid) {
2449                                         error = EEXIST;
2450                                         goto back;
2451                                 }
2452                         }
2453                 }
2454                 sc->sc_vhid = carpr->carpr_vhid;
2455
2456                 IF_LLADDR(ifp)[5] = sc->sc_vhid;
2457                 bcopy(IF_LLADDR(ifp), sc->arpcom.ac_enaddr,
2458                     ETHER_ADDR_LEN);
2459
2460                 error--;
2461         }
2462         if (carpr->carpr_advbase > 0 || carpr->carpr_advskew > 0) {
2463                 if (carpr->carpr_advskew >= 255) {
2464                         error = EINVAL;
2465                         goto back;
2466                 }
2467                 if (carpr->carpr_advbase > 255) {
2468                         error = EINVAL;
2469                         goto back;
2470                 }
2471                 sc->sc_advbase = carpr->carpr_advbase;
2472                 sc->sc_advskew = carpr->carpr_advskew;
2473                 error--;
2474         }
2475         bcopy(carpr->carpr_key, sc->sc_key, sizeof(sc->sc_key));
2476         if (error > 0) {
2477                 error = EINVAL;
2478         } else {
2479                 error = 0;
2480                 carp_setrun(sc, 0);
2481         }
2482 back:
2483         carp_hmac_prepare(sc);
2484
2485         lwkt_replymsg(&cmsg->base.lmsg, error);
2486 }
2487
2488 static int
2489 carp_ioctl_setvh(struct carp_softc *sc, void *udata, struct ucred *cr)
2490 {
2491         struct ifnet *ifp = &sc->arpcom.ac_if;
2492         struct netmsg_carp cmsg;
2493         struct carpreq carpr;
2494         int error;
2495
2496         ASSERT_IFNET_SERIALIZED_ALL(ifp);
2497         ifnet_deserialize_all(ifp);
2498
2499         error = priv_check_cred(cr, PRIV_ROOT, NULL_CRED_OKAY);
2500         if (error)
2501                 goto back;
2502
2503         error = copyin(udata, &carpr, sizeof(carpr));
2504         if (error)
2505                 goto back;
2506
2507         bzero(&cmsg, sizeof(cmsg));
2508         netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2509             carp_ioctl_setvh_dispatch);
2510         cmsg.nc_softc = sc;
2511         cmsg.nc_data = &carpr;
2512
2513         error = lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2514
2515 back:
2516         ifnet_serialize_all(ifp);
2517         return error;
2518 }
2519
2520 static void
2521 carp_ioctl_ifcap_dispatch(netmsg_t msg)
2522 {
2523         struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2524         struct carp_softc *sc = cmsg->nc_softc;
2525         struct ifnet *ifp = &sc->arpcom.ac_if;
2526         int reqcap = *((const int *)(cmsg->nc_data));
2527         int mask;
2528
2529         mask = reqcap ^ ifp->if_capenable;
2530         if (mask & IFCAP_TXCSUM) {
2531                 ifp->if_capenable ^= IFCAP_TXCSUM;
2532                 if ((ifp->if_capenable & IFCAP_TXCSUM) &&
2533                     sc->sc_carpdev != NULL) {
2534                         ifp->if_hwassist |=
2535                             (sc->sc_carpdev->if_hwassist &
2536                              (CSUM_IP | CSUM_UDP | CSUM_TCP));
2537                 } else {
2538                         ifp->if_hwassist &= ~(CSUM_IP | CSUM_UDP | CSUM_TCP);
2539                 }
2540         }
2541         if (mask & IFCAP_TSO) {
2542                 ifp->if_capenable ^= IFCAP_TSO;
2543                 if ((ifp->if_capenable & IFCAP_TSO) &&
2544                     sc->sc_carpdev != NULL) {
2545                         ifp->if_hwassist |=
2546                             (sc->sc_carpdev->if_hwassist & CSUM_TSO);
2547                 } else {
2548                         ifp->if_hwassist &= ~CSUM_TSO;
2549                 }
2550         }
2551
2552         lwkt_replymsg(&cmsg->base.lmsg, 0);
2553 }
2554
2555 static void
2556 carp_ioctl_ifcap(struct carp_softc *sc, int reqcap)
2557 {
2558         struct ifnet *ifp = &sc->arpcom.ac_if;
2559         struct netmsg_carp cmsg;
2560
2561         ASSERT_IFNET_SERIALIZED_ALL(ifp);
2562         ifnet_deserialize_all(ifp);
2563
2564         bzero(&cmsg, sizeof(cmsg));
2565         netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2566             carp_ioctl_ifcap_dispatch);
2567         cmsg.nc_softc = sc;
2568         cmsg.nc_data = &reqcap;
2569
2570         lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2571
2572         ifnet_serialize_all(ifp);
2573 }
2574
2575 static void
2576 carp_ioctl_getvh_dispatch(netmsg_t msg)
2577 {
2578         struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2579         struct carp_softc *sc = cmsg->nc_softc;
2580         struct carpreq *carpr = cmsg->nc_data;
2581
2582         carpr->carpr_state = sc->sc_state;
2583         carpr->carpr_vhid = sc->sc_vhid;
2584         carpr->carpr_advbase = sc->sc_advbase;
2585         carpr->carpr_advskew = sc->sc_advskew;
2586         bcopy(sc->sc_key, carpr->carpr_key, sizeof(carpr->carpr_key));
2587
2588         lwkt_replymsg(&cmsg->base.lmsg, 0);
2589 }
2590
2591 static int
2592 carp_ioctl_getvh(struct carp_softc *sc, void *udata, struct ucred *cr)
2593 {
2594         struct ifnet *ifp = &sc->arpcom.ac_if;
2595         struct netmsg_carp cmsg;
2596         struct carpreq carpr;
2597         int error;
2598
2599         ASSERT_IFNET_SERIALIZED_ALL(ifp);
2600         ifnet_deserialize_all(ifp);
2601
2602         bzero(&cmsg, sizeof(cmsg));
2603         netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2604             carp_ioctl_getvh_dispatch);
2605         cmsg.nc_softc = sc;
2606         cmsg.nc_data = &carpr;
2607
2608         lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2609
2610         error = priv_check_cred(cr, PRIV_ROOT, NULL_CRED_OKAY);
2611         if (error)
2612                 bzero(carpr.carpr_key, sizeof(carpr.carpr_key));
2613
2614         error = copyout(&carpr, udata, sizeof(carpr));
2615
2616         ifnet_serialize_all(ifp);
2617         return error;
2618 }
2619
2620 static void
2621 carp_ioctl_getdevname_dispatch(netmsg_t msg)
2622 {
2623         struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2624         struct carp_softc *sc = cmsg->nc_softc;
2625         char *devname = cmsg->nc_data;
2626
2627         bzero(devname, IFNAMSIZ);
2628         if (sc->sc_carpdev != NULL)
2629                 strlcpy(devname, sc->sc_carpdev->if_xname, IFNAMSIZ);
2630
2631         lwkt_replymsg(&cmsg->base.lmsg, 0);
2632 }
2633
2634 static int
2635 carp_ioctl_getdevname(struct carp_softc *sc, struct ifdrv *ifd)
2636 {
2637         struct ifnet *ifp = &sc->arpcom.ac_if;
2638         struct netmsg_carp cmsg;
2639         char devname[IFNAMSIZ];
2640         int error;
2641
2642         ASSERT_IFNET_SERIALIZED_ALL(ifp);
2643
2644         if (ifd->ifd_len != sizeof(devname))
2645                 return EINVAL;
2646
2647         ifnet_deserialize_all(ifp);
2648
2649         bzero(&cmsg, sizeof(cmsg));
2650         netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2651             carp_ioctl_getdevname_dispatch);
2652         cmsg.nc_softc = sc;
2653         cmsg.nc_data = devname;
2654
2655         lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2656
2657         error = copyout(devname, ifd->ifd_data, sizeof(devname));
2658
2659         ifnet_serialize_all(ifp);
2660         return error;
2661 }
2662
2663 static void
2664 carp_init_dispatch(netmsg_t msg)
2665 {
2666         struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2667         struct carp_softc *sc = cmsg->nc_softc;
2668
2669         sc->sc_if.if_flags |= IFF_RUNNING;
2670         carp_hmac_prepare(sc);
2671         carp_set_state(sc, INIT);
2672         carp_setrun(sc, 0);
2673
2674         lwkt_replymsg(&cmsg->base.lmsg, 0);
2675 }
2676
2677 static void
2678 carp_init(void *xsc)
2679 {
2680         struct carp_softc *sc = xsc;
2681         struct ifnet *ifp = &sc->arpcom.ac_if;
2682         struct netmsg_carp cmsg;
2683
2684         ASSERT_IFNET_SERIALIZED_ALL(ifp);
2685
2686         ifnet_deserialize_all(ifp);
2687
2688         bzero(&cmsg, sizeof(cmsg));
2689         netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2690             carp_init_dispatch);
2691         cmsg.nc_softc = sc;
2692
2693         lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2694
2695         ifnet_serialize_all(ifp);
2696 }
2697
2698 static int
2699 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
2700     struct rtentry *rt)
2701 {
2702         struct carp_softc *sc = ifp->if_softc;
2703         struct ifnet *carpdev;
2704         int error = 0;
2705
2706         carpdev = sc->sc_carpdev;
2707         if (carpdev != NULL) {
2708                 if (m->m_flags & M_MCAST)
2709                         IFNET_STAT_INC(ifp, omcasts, 1);
2710                 IFNET_STAT_INC(ifp, obytes, m->m_pkthdr.len + ETHER_HDR_LEN);
2711                 IFNET_STAT_INC(ifp, opackets, 1);
2712
2713                 /*
2714                  * NOTE:
2715                  * CARP's ifp is passed to backing device's
2716                  * if_output method.
2717                  */
2718                 carpdev->if_output(ifp, m, dst, rt);
2719         } else {
2720                 IFNET_STAT_INC(ifp, oerrors, 1);
2721                 m_freem(m);
2722                 error = ENETUNREACH;
2723         }
2724         return error;
2725 }
2726
2727 /*
2728  * Start output on carp interface. This function should never be called.
2729  */
2730 static void
2731 carp_start(struct ifnet *ifp, struct ifaltq_subque *ifsq __unused)
2732 {
2733         panic("%s: start called", ifp->if_xname);
2734 }
2735
2736 static void
2737 carp_set_state(struct carp_softc *sc, int state)
2738 {
2739         struct ifnet *cifp = &sc->sc_if;
2740
2741         if (sc->sc_state == state)
2742                 return;
2743         sc->sc_state = state;
2744
2745         switch (sc->sc_state) {
2746         case BACKUP:
2747                 cifp->if_link_state = LINK_STATE_DOWN;
2748                 break;
2749
2750         case MASTER:
2751                 cifp->if_link_state = LINK_STATE_UP;
2752                 break;
2753
2754         default:
2755                 cifp->if_link_state = LINK_STATE_UNKNOWN;
2756                 break;
2757         }
2758         rt_ifmsg(cifp);
2759 }
2760
2761 void
2762 carp_group_demote_adj(struct ifnet *ifp, int adj)
2763 {
2764         struct ifg_list *ifgl;
2765         int *dm;
2766
2767         TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) {
2768                 if (!strcmp(ifgl->ifgl_group->ifg_group, IFG_ALL))
2769                         continue;
2770                 dm = &ifgl->ifgl_group->ifg_carp_demoted;
2771
2772                 if (*dm + adj >= 0)
2773                         *dm += adj;
2774                 else
2775                         *dm = 0;
2776
2777                 if (adj > 0 && *dm == 1)
2778                         carp_send_ad_all();
2779                 CARP_LOG("%s demoted group %s to %d", ifp->if_xname,
2780                     ifgl->ifgl_group->ifg_group, *dm);
2781         }
2782 }
2783
2784 #ifdef foo
2785 void
2786 carp_carpdev_state(void *v)
2787 {
2788         struct carp_if *cif = v;
2789         struct carp_softc *sc;
2790
2791         TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
2792                 carp_sc_state(sc);
2793 }
2794
2795 static void
2796 carp_sc_state(struct carp_softc *sc)
2797 {
2798         if (!(sc->sc_carpdev->if_flags & IFF_UP)) {
2799                 callout_stop(&sc->sc_ad_tmo);
2800                 callout_stop(&sc->sc_md_tmo);
2801                 callout_stop(&sc->sc_md6_tmo);
2802                 carp_set_state(sc, INIT);
2803                 carp_setrun(sc, 0);
2804                 if (!sc->sc_suppress) {
2805                         carp_suppress_preempt++;
2806                         if (carp_suppress_preempt == 1)
2807                                 carp_send_ad_all();
2808                 }
2809                 sc->sc_suppress = 1;
2810         } else {
2811                 carp_set_state(sc, INIT);
2812                 carp_setrun(sc, 0);
2813                 if (sc->sc_suppress)
2814                         carp_suppress_preempt--;
2815                 sc->sc_suppress = 0;
2816         }
2817 }
2818 #endif
2819
2820 static void
2821 carp_stop(struct carp_softc *sc, boolean_t detach)
2822 {
2823         sc->sc_if.if_flags &= ~IFF_RUNNING;
2824
2825         callout_stop(&sc->sc_ad_tmo);
2826         callout_stop(&sc->sc_md_tmo);
2827         callout_stop(&sc->sc_md6_tmo);
2828
2829         if (!detach && sc->sc_state == MASTER)
2830                 carp_send_ad(sc);
2831
2832         if (sc->sc_suppress)
2833                 carp_suppress_preempt--;
2834         sc->sc_suppress = 0;
2835
2836         if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
2837                 carp_suppress_preempt--;
2838         sc->sc_sendad_errors = 0;
2839         sc->sc_sendad_success = 0;
2840
2841         carp_set_state(sc, INIT);
2842         carp_setrun(sc, 0);
2843 }
2844
2845 static void
2846 carp_suspend(struct carp_softc *sc, boolean_t detach)
2847 {
2848         struct ifnet *cifp = &sc->sc_if;
2849
2850         carp_stop(sc, detach);
2851
2852         /* Retain the running state, if we are not dead yet */
2853         if (!sc->sc_dead && (cifp->if_flags & IFF_UP))
2854                 cifp->if_flags |= IFF_RUNNING;
2855 }
2856
2857 static int
2858 carp_activate_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
2859     struct ifnet *ifp, struct in_ifaddr *ia_if, int own)
2860 {
2861         struct ip_moptions *imo = &sc->sc_imo;
2862         struct carp_if *ocif = ifp->if_carp;
2863         int error;
2864
2865         KKASSERT(vha->vha_ia != NULL);
2866
2867         KASSERT(ia_if != NULL, ("NULL backing address"));
2868         KASSERT(vha->vha_iaback == NULL, ("%p is already activated", vha));
2869         KASSERT((vha->vha_flags & CARP_VHAF_OWNER) == 0,
2870                 ("inactive vhaddr %p is the address owner", vha));
2871
2872         KASSERT(sc->sc_carpdev == NULL || sc->sc_carpdev == ifp,
2873                 ("%s is already on %s", sc->sc_if.if_xname,
2874                  sc->sc_carpdev->if_xname));
2875
2876         if (ocif == NULL) {
2877                 KASSERT(sc->sc_carpdev == NULL,
2878                         ("%s is already on %s", sc->sc_if.if_xname,
2879                          sc->sc_carpdev->if_xname));
2880
2881                 error = ifpromisc(ifp, 1);
2882                 if (error)
2883                         return error;
2884         } else {
2885                 struct carp_softc_container *scc;
2886
2887                 TAILQ_FOREACH(scc, ocif, scc_link) {
2888                         struct carp_softc *vr = scc->scc_softc;
2889
2890                         if (vr != sc && vr->sc_vhid == sc->sc_vhid)
2891                                 return EINVAL;
2892                 }
2893         }
2894
2895         ifp->if_carp = carp_if_insert(ocif, sc);
2896         KASSERT(ifp->if_carp != NULL, ("%s carp_if_insert failed", __func__));
2897
2898         sc->sc_ia = ia_if;
2899         sc->sc_carpdev = ifp;
2900         sc->arpcom.ac_if.if_hwassist = 0;
2901         if (sc->arpcom.ac_if.if_capenable & IFCAP_TXCSUM) {
2902                 sc->arpcom.ac_if.if_hwassist |=
2903                     (ifp->if_hwassist & (CSUM_IP | CSUM_UDP | CSUM_TCP));
2904         }
2905         if (sc->arpcom.ac_if.if_capenable & IFCAP_TSO)
2906                 sc->arpcom.ac_if.if_hwassist |= (ifp->if_hwassist & CSUM_TSO);
2907
2908         /*
2909          * Make sure that all protocol threads see the sc_carpdev and
2910          * if_carp changes
2911          */
2912         netmsg_service_sync();
2913
2914         if (ocif != NULL && ifp->if_carp != ocif) {
2915                 /*
2916                  * The old carp list could be safely free now,
2917                  * since no one can access it.
2918                  */
2919                 carp_if_free(ocif);
2920         }
2921
2922         vha->vha_iaback = ia_if;
2923         sc->sc_naddrs++;
2924
2925         if (own) {
2926                 vha->vha_flags |= CARP_VHAF_OWNER;
2927
2928                 /* XXX save user configured advskew? */
2929                 sc->sc_advskew = 0;
2930         }
2931
2932         carp_addroute_vhaddr(sc, vha);
2933
2934         /*
2935          * Join the multicast group only after the backing interface
2936          * has been hooked with the CARP interface.
2937          */
2938         KASSERT(imo->imo_multicast_ifp == NULL ||
2939                 imo->imo_multicast_ifp == &sc->sc_if,
2940                 ("%s didn't leave mcast group on %s",
2941                  sc->sc_if.if_xname, imo->imo_multicast_ifp->if_xname));
2942
2943         if (imo->imo_num_memberships == 0) {
2944                 struct in_addr addr;
2945
2946                 addr.s_addr = htonl(INADDR_CARP_GROUP);
2947                 imo->imo_membership[0] = in_addmulti(&addr, &sc->sc_if);
2948                 if (imo->imo_membership[0] == NULL) {
2949                         carp_deactivate_vhaddr(sc, vha, FALSE);
2950                         return ENOBUFS;
2951                 }
2952
2953                 imo->imo_num_memberships++;
2954                 imo->imo_multicast_ifp = &sc->sc_if;
2955                 imo->imo_multicast_ttl = CARP_DFLTTL;
2956                 imo->imo_multicast_loop = 0;
2957         }
2958
2959         carp_hmac_prepare(sc);
2960         carp_set_state(sc, INIT);
2961         carp_setrun(sc, 0);
2962         return 0;
2963 }
2964
2965 static void
2966 carp_deactivate_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
2967     boolean_t del_iaback)
2968 {
2969         KKASSERT(vha->vha_ia != NULL);
2970
2971         carp_hmac_prepare(sc);
2972
2973         if (vha->vha_iaback == NULL) {
2974                 KASSERT((vha->vha_flags & CARP_VHAF_OWNER) == 0,
2975                         ("inactive vhaddr %p is the address owner", vha));
2976                 return;
2977         }
2978
2979         vha->vha_flags &= ~CARP_VHAF_OWNER;
2980         carp_delroute_vhaddr(sc, vha, del_iaback);
2981
2982         KKASSERT(sc->sc_naddrs > 0);
2983         vha->vha_iaback = NULL;
2984         sc->sc_naddrs--;
2985         if (!sc->sc_naddrs) {
2986                 if (sc->sc_naddrs6) {
2987                         carp_multicast_cleanup(sc);
2988                         sc->sc_ia = NULL;
2989                 } else {
2990                         carp_detach(sc, FALSE, del_iaback);
2991                 }
2992         }
2993 }
2994
2995 static void
2996 carp_link_addrs(struct carp_softc *sc, struct ifnet *ifp, struct ifaddr *ifa_if)
2997 {
2998         struct carp_vhaddr *vha;
2999         struct in_ifaddr *ia_if;
3000
3001         KKASSERT(ifa_if->ifa_addr->sa_family == AF_INET);
3002         ia_if = ifatoia(ifa_if);
3003
3004         /*
3005          * Test each inactive vhaddr against the newly added address.
3006          * If the newly added address could be the backing address,
3007          * then activate the matching vhaddr.
3008          */
3009         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
3010                 const struct in_ifaddr *ia;
3011                 int own;
3012
3013                 if (vha->vha_iaback != NULL)
3014                         continue;
3015
3016                 ia = vha->vha_ia;
3017                 if (ia->ia_subnetmask != ia_if->ia_subnetmask ||
3018                     ia->ia_subnet != ia_if->ia_subnet)
3019                         continue;
3020
3021                 own = 0;
3022                 if (ia->ia_addr.sin_addr.s_addr ==
3023                     ia_if->ia_addr.sin_addr.s_addr)
3024                         own = 1;
3025
3026                 carp_activate_vhaddr(sc, vha, ifp, ia_if, own);
3027         }
3028 }
3029
3030 static void
3031 carp_unlink_addrs(struct carp_softc *sc, struct ifnet *ifp,
3032                   struct ifaddr *ifa_if)
3033 {
3034         struct carp_vhaddr *vha;
3035         struct in_ifaddr *ia_if;
3036
3037         KKASSERT(ifa_if->ifa_addr->sa_family == AF_INET);
3038         ia_if = ifatoia(ifa_if);
3039
3040         /*
3041          * Ad src address is deleted; set it to NULL.
3042          * Following loop will try pick up a new ad src address
3043          * if one of the vhaddr could retain its backing address.
3044          */
3045         if (sc->sc_ia == ia_if)
3046                 sc->sc_ia = NULL;
3047
3048         /*
3049          * Test each active vhaddr against the deleted address.
3050          * If the deleted address is vhaddr address's backing
3051          * address, then deactivate the vhaddr.
3052          */
3053         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
3054                 if (vha->vha_iaback == NULL)
3055                         continue;
3056
3057                 if (vha->vha_iaback == ia_if)
3058                         carp_deactivate_vhaddr(sc, vha, TRUE);
3059                 else if (sc->sc_ia == NULL)
3060                         sc->sc_ia = vha->vha_iaback;
3061         }
3062 }
3063
3064 static void
3065 carp_update_addrs(struct carp_softc *sc, struct ifaddr *ifa_del)
3066 {
3067         struct carp_vhaddr *vha;
3068
3069         KKASSERT(sc->sc_carpdev == NULL);
3070
3071         TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
3072                 carp_config_vhaddr(sc, vha, ifatoia(ifa_del));
3073 }
3074
3075 static void
3076 carp_ifaddr(void *arg __unused, struct ifnet *ifp,
3077             enum ifaddr_event event, struct ifaddr *ifa)
3078 {
3079         struct carp_softc *sc;
3080
3081         if (ifa->ifa_addr->sa_family != AF_INET)
3082                 return;
3083
3084         ASSERT_NETISR0;
3085
3086         if (ifp->if_type == IFT_CARP) {
3087                 /*
3088                  * Address is changed on carp(4) interface
3089                  */
3090                 switch (event) {
3091                 case IFADDR_EVENT_ADD:
3092                         carp_add_addr(ifp->if_softc, ifa);
3093                         break;
3094
3095                 case IFADDR_EVENT_CHANGE:
3096                         carp_config_addr(ifp->if_softc, ifa);
3097                         break;
3098
3099                 case IFADDR_EVENT_DELETE:
3100                         carp_del_addr(ifp->if_softc, ifa);
3101                         break;
3102                 }
3103                 return;
3104         }
3105
3106         /*
3107          * Address is changed on non-carp(4) interface
3108          */
3109         if ((ifp->if_flags & IFF_MULTICAST) == 0)
3110                 return;
3111
3112         LIST_FOREACH(sc, &carpif_list, sc_next) {
3113                 if (sc->sc_carpdev != NULL && sc->sc_carpdev != ifp) {
3114                         /* Not the parent iface; skip */
3115                         continue;
3116                 }
3117
3118                 switch (event) {
3119                 case IFADDR_EVENT_ADD:
3120                         carp_link_addrs(sc, ifp, ifa);
3121                         break;
3122
3123                 case IFADDR_EVENT_DELETE:
3124                         if (sc->sc_carpdev != NULL) {
3125                                 carp_unlink_addrs(sc, ifp, ifa);
3126                                 if (sc->sc_carpdev == NULL) {
3127                                         /*
3128                                          * We no longer have the parent
3129                                          * interface, however, certain
3130                                          * virtual addresses, which are
3131                                          * not used because they can't
3132                                          * match the previous parent
3133                                          * interface's addresses, may now
3134                                          * match different interface's
3135                                          * addresses.
3136                                          */
3137                                         carp_update_addrs(sc, ifa);
3138                                 }
3139                         } else {
3140                                 /*
3141                                  * The carp(4) interface didn't have a
3142                                  * parent iface, so it is not possible
3143                                  * that it will contain any address to
3144                                  * be unlinked.
3145                                  */
3146                         }
3147                         break;
3148
3149                 case IFADDR_EVENT_CHANGE:
3150                         if (sc->sc_carpdev == NULL) {
3151                                 /*
3152                                  * The carp(4) interface didn't have a
3153                                  * parent iface, so it is not possible
3154                                  * that it will contain any address to
3155                                  * be updated.
3156                                  */
3157                                 carp_link_addrs(sc, ifp, ifa);
3158                         } else {
3159                                 /*
3160                                  * First try breaking tie with the old
3161                                  * address.  Then see whether we could
3162                                  * link certain vhaddr to the new address.
3163                                  * If that fails, i.e. carpdev is NULL,
3164                                  * we try a global update.
3165                                  *
3166                                  * NOTE: The above order is critical.
3167                                  */
3168                                 carp_unlink_addrs(sc, ifp, ifa);
3169                                 carp_link_addrs(sc, ifp, ifa);
3170                                 if (sc->sc_carpdev == NULL) {
3171                                         /*
3172                                          * See the comment in the above
3173                                          * IFADDR_EVENT_DELETE block.
3174                                          */
3175                                         carp_update_addrs(sc, NULL);
3176                                 }
3177                         }
3178                         break;
3179                 }
3180         }
3181 }
3182
3183 void
3184 carp_proto_ctlinput(netmsg_t msg)
3185 {
3186         int cmd = msg->ctlinput.nm_cmd;
3187         struct sockaddr *sa = msg->ctlinput.nm_arg;
3188         struct in_ifaddr_container *iac;
3189
3190         /* We only process PRC_IFDOWN and PRC_IFUP commands */
3191         if (cmd != PRC_IFDOWN && cmd != PRC_IFUP)
3192                 goto done;
3193
3194         TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
3195                 struct in_ifaddr *ia = iac->ia;
3196                 struct ifnet *ifp = ia->ia_ifp;
3197
3198                 if (ifp->if_type == IFT_CARP)
3199                         continue;
3200
3201                 if (ia->ia_ifa.ifa_addr == sa) {
3202                         if (cmd == PRC_IFDOWN) {
3203                                 carp_ifaddr(NULL, ifp, IFADDR_EVENT_DELETE,
3204                                     &ia->ia_ifa);
3205                         } else if (cmd == PRC_IFUP) {
3206                                 carp_ifaddr(NULL, ifp, IFADDR_EVENT_ADD,
3207                                     &ia->ia_ifa);
3208                         }
3209                         break;
3210                 }
3211         }
3212 done:
3213         lwkt_replymsg(&msg->lmsg, 0);
3214 }
3215
3216 struct ifnet *
3217 carp_parent(struct ifnet *cifp)
3218 {
3219         struct carp_softc *sc;
3220
3221         KKASSERT(cifp->if_type == IFT_CARP);
3222         sc = cifp->if_softc;
3223
3224         return sc->sc_carpdev;
3225 }
3226
3227 #define rtinitflags(x) \
3228         (((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) \
3229                  ? RTF_HOST : 0)
3230
3231 static int
3232 carp_addroute_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha)
3233 {
3234         struct in_ifaddr *ia, *iaback;
3235
3236         if (sc->sc_state != MASTER)
3237                 return 0;
3238
3239         ia = vha->vha_ia;
3240         KKASSERT(ia != NULL);
3241
3242         iaback = vha->vha_iaback;
3243         KKASSERT(iaback != NULL);
3244
3245         return rtchange(&iaback->ia_ifa, &ia->ia_ifa);
3246 }
3247
3248 static void
3249 carp_delroute_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
3250     boolean_t del_iaback)
3251 {
3252         struct in_ifaddr *ia, *iaback;
3253
3254         ia = vha->vha_ia;
3255         KKASSERT(ia != NULL);
3256
3257         iaback = vha->vha_iaback;
3258         KKASSERT(iaback != NULL);
3259
3260         if (!del_iaback && (iaback->ia_ifp->if_flags & IFF_UP)) {
3261                 rtchange(&ia->ia_ifa, &iaback->ia_ifa);
3262                 return;
3263         }
3264
3265         rtinit(&ia->ia_ifa, RTM_DELETE, rtinitflags(ia));
3266         in_ifadown_force(&ia->ia_ifa, 1);
3267         ia->ia_flags &= ~IFA_ROUTE;
3268 }
3269
3270 static int
3271 carp_modevent(module_t mod, int type, void *data)
3272 {
3273         switch (type) {
3274         case MOD_LOAD:
3275                 LIST_INIT(&carpif_list);
3276                 carp_ifdetach_event =
3277                 EVENTHANDLER_REGISTER(ifnet_detach_event, carp_ifdetach, NULL,
3278                                       EVENTHANDLER_PRI_ANY);
3279                 carp_ifaddr_event =
3280                 EVENTHANDLER_REGISTER(ifaddr_event, carp_ifaddr, NULL,
3281                                       EVENTHANDLER_PRI_FIRST);
3282                 if_clone_attach(&carp_cloner);
3283                 break;
3284
3285         case MOD_UNLOAD:
3286                 EVENTHANDLER_DEREGISTER(ifnet_detach_event,
3287                                         carp_ifdetach_event);
3288                 EVENTHANDLER_DEREGISTER(ifaddr_event,
3289                                         carp_ifaddr_event);
3290                 if_clone_detach(&carp_cloner);
3291                 break;
3292
3293         default:
3294                 return (EINVAL);
3295         }
3296         return (0);
3297 }
3298
3299 static moduledata_t carp_mod = {
3300         "carp",
3301         carp_modevent,
3302         0
3303 };
3304 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);