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drm/i915: Update to Linux 4.2
[dragonfly.git] / sys / netinet / ip_carp.c
blob5852511f231665b3d15856038472724bac5faeeb
1 /*
2 * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
3 * Copyright (c) 2003 Ryan McBride. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
18 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
20 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
22 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
23 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
24 * THE POSSIBILITY OF SUCH DAMAGE.
25 */
26 /*
27 * $FreeBSD: src/sys/netinet/ip_carp.c,v 1.48 2007/02/02 09:39:09 glebius Exp $
28 */
29
30 #include "opt_carp.h"
31 #include "opt_inet.h"
32 #include "opt_inet6.h"
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/in_cksum.h>
38 #include <sys/limits.h>
39 #include <sys/malloc.h>
40 #include <sys/mbuf.h>
41 #include <sys/msgport2.h>
42 #include <sys/time.h>
43 #include <sys/proc.h>
44 #include <sys/priv.h>
45 #include <sys/sockio.h>
46 #include <sys/socket.h>
47 #include <sys/sysctl.h>
48 #include <sys/syslog.h>
49 #include <sys/thread.h>
50
51 #include <machine/stdarg.h>
52 #include <crypto/sha1.h>
53
54 #include <net/bpf.h>
55 #include <net/ethernet.h>
56 #include <net/if.h>
57 #include <net/if_dl.h>
58 #include <net/if_types.h>
59 #include <net/route.h>
60 #include <net/if_clone.h>
61 #include <net/if_var.h>
62 #include <net/ifq_var.h>
63 #include <net/netmsg2.h>
64 #include <net/netisr2.h>
65
66 #ifdef INET
67 #include <netinet/in.h>
68 #include <netinet/in_var.h>
69 #include <netinet/in_systm.h>
70 #include <netinet/ip.h>
71 #include <netinet/ip_var.h>
72 #include <netinet/if_ether.h>
73 #endif
74
75 #ifdef INET6
76 #include <netinet/icmp6.h>
77 #include <netinet/ip6.h>
78 #include <netinet6/ip6_var.h>
79 #include <netinet6/scope6_var.h>
80 #include <netinet6/nd6.h>
81 #endif
82
83 #include <netinet/ip_carp.h>
84
85 /*
86 * Note about carp's MP safe approach:
87 *
88 * Brief: carp_softc (softc), carp_softc_container (scc)
89 *
90 * - All configuration operation, e.g. ioctl, add/delete inet addresses
91 * is serialized by netisr0; not by carp's serializer
92 *
93 * - Backing interface's if_carp and carp_softc's relationship:
94 *
95 * +---------+
96 * if_carp -->| carp_if |
97 * +---------+
98 * |
99 * |
100 * V +---------+
101 * +-----+ | |
102 * | scc |-->| softc |
103 * +-----+ | |
104 * | +---------+
105 * |
106 * V +---------+
107 * +-----+ | |
108 * | scc |-->| softc |
109 * +-----+ | |
110 * +---------+
111 *
112 * - if_carp creation, modification and deletion all happen in netisr0,
113 * as stated previously. Since if_carp is accessed by multiple netisrs,
114 * the modification to if_carp is conducted in the following way:
115 *
116 * Adding carp_softc:
117 *
118 * 1) Duplicate the old carp_if to new carp_if (ncif), and insert the
119 * to-be-added carp_softc to the new carp_if (ncif):
120 *
121 * if_carp ncif
122 * | |
123 * V V
124 * +---------+ +---------+
125 * | carp_if | | carp_if |
126 * +---------+ +---------+
127 * | |
128 * | |
129 * V +-------+ V
130 * +-----+ | | +-----+
131 * | scc |---->| softc |<----| scc |
132 * +-----+ | | +-----+
133 * | +-------+ |
134 * | |
135 * V +-------+ V
136 * +-----+ | | +-----+
137 * | scc |---->| softc |<----| scc |
138 * +-----+ | | +-----+
139 * +-------+ |
140 * |
141 * +-------+ V
142 * | | +-----+
143 * | softc |<----| scc |
144 * | | +-----+
145 * +-------+
146 *
147 * 2) Switch save if_carp into ocif and switch if_carp to ncif:
148 *
149 * ocif if_carp
150 * | |
151 * V V
152 * +---------+ +---------+
153 * | carp_if | | carp_if |
154 * +---------+ +---------+
155 * | |
156 * | |
157 * V +-------+ V
158 * +-----+ | | +-----+
159 * | scc |---->| softc |<----| scc |
160 * +-----+ | | +-----+
161 * | +-------+ |
162 * | |
163 * V +-------+ V
164 * +-----+ | | +-----+
165 * | scc |---->| softc |<----| scc |
166 * +-----+ | | +-----+
167 * +-------+ |
168 * |
169 * +-------+ V
170 * | | +-----+
171 * | softc |<----| scc |
172 * | | +-----+
173 * +-------+
174 *
175 * 3) Run netmsg_service_sync(), which will make sure that
176 * ocif is no longer accessed (all network operations
177 * are happened only in network threads).
178 * 4) Free ocif -- only carp_if and scc are freed.
179 *
180 *
181 * Removing carp_softc:
182 *
183 * 1) Duplicate the old carp_if to new carp_if (ncif); the to-be-deleted
184 * carp_softc will not be duplicated.
185 *
186 * if_carp ncif
187 * | |
188 * V V
189 * +---------+ +---------+
190 * | carp_if | | carp_if |
191 * +---------+ +---------+
192 * | |
193 * | |
194 * V +-------+ V
195 * +-----+ | | +-----+
196 * | scc |---->| softc |<----| scc |
197 * +-----+ | | +-----+
198 * | +-------+ |
199 * | |
200 * V +-------+ |
201 * +-----+ | | |
202 * | scc |---->| softc | |
203 * +-----+ | | |
204 * | +-------+ |
205 * | |
206 * V +-------+ V
207 * +-----+ | | +-----+
208 * | scc |---->| softc |<----| scc |
209 * +-----+ | | +-----+
210 * +-------+
211 *
212 * 2) Switch save if_carp into ocif and switch if_carp to ncif:
213 *
214 * ocif if_carp
215 * | |
216 * V V
217 * +---------+ +---------+
218 * | carp_if | | carp_if |
219 * +---------+ +---------+
220 * | |
221 * | |
222 * V +-------+ V
223 * +-----+ | | +-----+
224 * | scc |---->| softc |<----| scc |
225 * +-----+ | | +-----+
226 * | +-------+ |
227 * | |
228 * V +-------+ |
229 * +-----+ | | |
230 * | scc |---->| softc | |
231 * +-----+ | | |
232 * | +-------+ |
233 * | |
234 * V +-------+ V
235 * +-----+ | | +-----+
236 * | scc |---->| softc |<----| scc |
237 * +-----+ | | +-----+
238 * +-------+
239 *
240 * 3) Run netmsg_service_sync(), which will make sure that
241 * ocif is no longer accessed (all network operations
242 * are happened only in network threads).
243 * 4) Free ocif -- only carp_if and scc are freed.
244 *
245 * - if_carp accessing:
246 * The accessing code should cache the if_carp in a local temporary
247 * variable and accessing the temporary variable along the code path
248 * instead of accessing if_carp later on.
249 */
250
251 #define CARP_IFNAME "carp"
252 #define CARP_IS_RUNNING(ifp) \
253 (((ifp)->if_flags & (IFF_UP | IFF_RUNNING)) == (IFF_UP | IFF_RUNNING))
254
255 struct carp_softc;
256
257 struct carp_vhaddr {
258 uint32_t vha_flags; /* CARP_VHAF_ */
259 struct in_ifaddr *vha_ia; /* carp address */
260 struct in_ifaddr *vha_iaback; /* backing address */
261 TAILQ_ENTRY(carp_vhaddr) vha_link;
262 };
263 TAILQ_HEAD(carp_vhaddr_list, carp_vhaddr);
264
265 struct netmsg_carp {
266 struct netmsg_base base;
267 struct ifnet *nc_carpdev;
268 struct carp_softc *nc_softc;
269 void *nc_data;
270 size_t nc_datalen;
271 };
272
273 struct carp_softc {
274 struct arpcom arpcom;
275 struct ifnet *sc_carpdev; /* parent interface */
276 struct carp_vhaddr_list sc_vha_list; /* virtual addr list */
277
278 const struct in_ifaddr *sc_ia; /* primary iface address v4 */
279 struct ip_moptions sc_imo;
280
281 #ifdef INET6
282 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */
283 struct ip6_moptions sc_im6o;
284 #endif /* INET6 */
285
286 enum { INIT = 0, BACKUP, MASTER }
287 sc_state;
288 boolean_t sc_dead;
289
290 int sc_suppress;
291
292 int sc_sendad_errors;
293 #define CARP_SENDAD_MAX_ERRORS 3
294 int sc_sendad_success;
295 #define CARP_SENDAD_MIN_SUCCESS 3
296
297 int sc_vhid;
298 int sc_advskew;
299 int sc_naddrs; /* actually used IPv4 vha */
300 int sc_naddrs6;
301 int sc_advbase; /* seconds */
302 int sc_init_counter;
303 uint64_t sc_counter;
304
305 /* authentication */
306 #define CARP_HMAC_PAD 64
307 unsigned char sc_key[CARP_KEY_LEN];
308 unsigned char sc_pad[CARP_HMAC_PAD];
309 SHA1_CTX sc_sha1;
310
311 struct callout sc_ad_tmo; /* advertisement timeout */
312 struct netmsg_carp sc_ad_msg; /* adv timeout netmsg */
313 struct callout sc_md_tmo; /* ip4 master down timeout */
314 struct callout sc_md6_tmo; /* ip6 master down timeout */
315 struct netmsg_carp sc_md_msg; /* master down timeout netmsg */
316
317 LIST_ENTRY(carp_softc) sc_next; /* Interface clue */
318 };
319
320 #define sc_if arpcom.ac_if
321
322 struct carp_softc_container {
323 TAILQ_ENTRY(carp_softc_container) scc_link;
324 struct carp_softc *scc_softc;
325 };
326 TAILQ_HEAD(carp_if, carp_softc_container);
327
328 SYSCTL_DECL(_net_inet_carp);
329
330 static int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */
331 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW,
332 &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets");
333 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW,
334 &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode");
335 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW,
336 &carp_opts[CARPCTL_LOG], 0, "log bad carp packets");
337 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW,
338 &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses");
339
340 static int carp_suppress_preempt = 0;
341 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD,
342 &carp_suppress_preempt, 0, "Preemption is suppressed");
343
344 static int carp_prio_ad = 1;
345 SYSCTL_INT(_net_inet_carp, OID_AUTO, prio_ad, CTLFLAG_RD,
346 &carp_prio_ad, 0, "Prioritize advertisement packet");
347
348 static struct carpstats carpstats;
349 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW,
350 &carpstats, carpstats,
351 "CARP statistics (struct carpstats, netinet/ip_carp.h)");
352
353 #define CARP_LOG(...) do { \
354 if (carp_opts[CARPCTL_LOG] > 0) \
355 log(LOG_INFO, __VA_ARGS__); \
356 } while (0)
357
358 #define CARP_DEBUG(...) do { \
359 if (carp_opts[CARPCTL_LOG] > 1) \
360 log(LOG_DEBUG, __VA_ARGS__); \
361 } while (0)
362
363 static struct lwkt_token carp_listtok = LWKT_TOKEN_INITIALIZER(carp_list_token);
364
365 static void carp_hmac_prepare(struct carp_softc *);
366 static void carp_hmac_generate(struct carp_softc *, uint32_t *,
367 unsigned char *);
368 static int carp_hmac_verify(struct carp_softc *, uint32_t *,
369 unsigned char *);
370 static void carp_setroute(struct carp_softc *, int);
371 static void carp_proto_input_c(struct carp_softc *, struct mbuf *,
372 struct carp_header *, sa_family_t);
373 static int carp_clone_create(struct if_clone *, int, caddr_t);
374 static int carp_clone_destroy(struct ifnet *);
375 static void carp_detach(struct carp_softc *, boolean_t, boolean_t);
376 static void carp_prepare_ad(struct carp_softc *, struct carp_header *);
377 static void carp_send_ad_all(void);
378 static void carp_send_ad_timeout(void *);
379 static void carp_send_ad(struct carp_softc *);
380 static void carp_send_arp(struct carp_softc *);
381 static void carp_master_down_timeout(void *);
382 static void carp_master_down(struct carp_softc *);
383 static void carp_setrun(struct carp_softc *, sa_family_t);
384 static void carp_set_state(struct carp_softc *, int);
385 static struct ifnet *carp_forus(struct carp_if *, const uint8_t *);
386
387 static void carp_init(void *);
388 static int carp_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
389 static int carp_output(struct ifnet *, struct mbuf *, struct sockaddr *,
390 struct rtentry *);
391 static void carp_start(struct ifnet *, struct ifaltq_subque *);
392
393 static void carp_multicast_cleanup(struct carp_softc *);
394 static void carp_add_addr(struct carp_softc *, struct ifaddr *);
395 static void carp_del_addr(struct carp_softc *, struct ifaddr *);
396 static void carp_config_addr(struct carp_softc *, struct ifaddr *);
397 static void carp_link_addrs(struct carp_softc *, struct ifnet *,
398 struct ifaddr *);
399 static void carp_unlink_addrs(struct carp_softc *, struct ifnet *,
400 struct ifaddr *);
401 static void carp_update_addrs(struct carp_softc *, struct ifaddr *);
402
403 static int carp_config_vhaddr(struct carp_softc *, struct carp_vhaddr *,
404 struct in_ifaddr *);
405 static int carp_activate_vhaddr(struct carp_softc *, struct carp_vhaddr *,
406 struct ifnet *, struct in_ifaddr *, int);
407 static void carp_deactivate_vhaddr(struct carp_softc *,
408 struct carp_vhaddr *, boolean_t);
409 static int carp_addroute_vhaddr(struct carp_softc *, struct carp_vhaddr *);
410 static void carp_delroute_vhaddr(struct carp_softc *, struct carp_vhaddr *,
411 boolean_t);
412
413 #ifdef foo
414 static void carp_sc_state(struct carp_softc *);
415 #endif
416 #ifdef INET6
417 static void carp_send_na(struct carp_softc *);
418 #ifdef notyet
419 static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *);
420 static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *);
421 #endif
422 static void carp_multicast6_cleanup(struct carp_softc *);
423 #endif
424 static void carp_stop(struct carp_softc *, boolean_t);
425 static void carp_suspend(struct carp_softc *, boolean_t);
426 static void carp_ioctl_stop(struct carp_softc *);
427 static int carp_ioctl_setvh(struct carp_softc *, void *, struct ucred *);
428 static void carp_ioctl_ifcap(struct carp_softc *, int);
429 static int carp_ioctl_getvh(struct carp_softc *, void *, struct ucred *);
430 static int carp_ioctl_getdevname(struct carp_softc *, struct ifdrv *);
431 static int carp_ioctl_getvhaddr(struct carp_softc *, struct ifdrv *);
432
433 static struct carp_if *carp_if_remove(struct carp_if *, struct carp_softc *);
434 static struct carp_if *carp_if_insert(struct carp_if *, struct carp_softc *);
435 static void carp_if_free(struct carp_if *);
436
437 static void carp_ifaddr(void *, struct ifnet *, enum ifaddr_event,
438 struct ifaddr *);
439 static void carp_ifdetach(void *, struct ifnet *);
440
441 static void carp_ifdetach_dispatch(netmsg_t);
442 static void carp_clone_destroy_dispatch(netmsg_t);
443 static void carp_init_dispatch(netmsg_t);
444 static void carp_ioctl_stop_dispatch(netmsg_t);
445 static void carp_ioctl_setvh_dispatch(netmsg_t);
446 static void carp_ioctl_ifcap_dispatch(netmsg_t);
447 static void carp_ioctl_getvh_dispatch(netmsg_t);
448 static void carp_ioctl_getdevname_dispatch(netmsg_t);
449 static void carp_ioctl_getvhaddr_dispatch(netmsg_t);
450 static void carp_send_ad_timeout_dispatch(netmsg_t);
451 static void carp_master_down_timeout_dispatch(netmsg_t);
452
453 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces");
454
455 static LIST_HEAD(, carp_softc) carpif_list;
456
457 static struct if_clone carp_cloner =
458 IF_CLONE_INITIALIZER(CARP_IFNAME, carp_clone_create, carp_clone_destroy,
459 0, IF_MAXUNIT);
460
461 static const uint8_t carp_etheraddr[ETHER_ADDR_LEN] =
462 { 0, 0, 0x5e, 0, 1, 0 };
463
464 static eventhandler_tag carp_ifdetach_event;
465 static eventhandler_tag carp_ifaddr_event;
466
467 static __inline void
468 carp_insert_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha_new)
469 {
470 struct carp_vhaddr *vha;
471 u_long new_addr, addr;
472
473 KKASSERT((vha_new->vha_flags & CARP_VHAF_ONLIST) == 0);
474
475 /*
476 * Virtual address list is sorted; smaller one first
477 */
478 new_addr = ntohl(vha_new->vha_ia->ia_addr.sin_addr.s_addr);
479
480 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
481 addr = ntohl(vha->vha_ia->ia_addr.sin_addr.s_addr);
482
483 if (addr > new_addr)
484 break;
485 }
486 if (vha == NULL)
487 TAILQ_INSERT_TAIL(&sc->sc_vha_list, vha_new, vha_link);
488 else
489 TAILQ_INSERT_BEFORE(vha, vha_new, vha_link);
490 vha_new->vha_flags |= CARP_VHAF_ONLIST;
491 }
492
493 static __inline void
494 carp_remove_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha)
495 {
496 KKASSERT(vha->vha_flags & CARP_VHAF_ONLIST);
497 vha->vha_flags &= ~CARP_VHAF_ONLIST;
498 TAILQ_REMOVE(&sc->sc_vha_list, vha, vha_link);
499 }
500
501 static void
502 carp_hmac_prepare(struct carp_softc *sc)
503 {
504 uint8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
505 uint8_t vhid = sc->sc_vhid & 0xff;
506 int i;
507 #ifdef INET6
508 struct ifaddr_container *ifac;
509 struct in6_addr in6;
510 #endif
511 #ifdef INET
512 struct carp_vhaddr *vha;
513 #endif
514
515 /* XXX: possible race here */
516
517 /* compute ipad from key */
518 bzero(sc->sc_pad, sizeof(sc->sc_pad));
519 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
520 for (i = 0; i < sizeof(sc->sc_pad); i++)
521 sc->sc_pad[i] ^= 0x36;
522
523 /* precompute first part of inner hash */
524 SHA1Init(&sc->sc_sha1);
525 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
526 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
527 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
528 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
529 #ifdef INET
530 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
531 SHA1Update(&sc->sc_sha1,
532 (const uint8_t *)&vha->vha_ia->ia_addr.sin_addr,
533 sizeof(struct in_addr));
534 }
535 #endif /* INET */
536 #ifdef INET6
537 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
538 struct ifaddr *ifa = ifac->ifa;
539
540 if (ifa->ifa_addr->sa_family == AF_INET6) {
541 in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
542 in6_clearscope(&in6);
543 SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6));
544 }
545 }
546 #endif /* INET6 */
547
548 /* convert ipad to opad */
549 for (i = 0; i < sizeof(sc->sc_pad); i++)
550 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
551 }
552
553 static void
554 carp_hmac_generate(struct carp_softc *sc, uint32_t counter[2],
555 unsigned char md[20])
556 {
557 SHA1_CTX sha1ctx;
558
559 /* fetch first half of inner hash */
560 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
561
562 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
563 SHA1Final(md, &sha1ctx);
564
565 /* outer hash */
566 SHA1Init(&sha1ctx);
567 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
568 SHA1Update(&sha1ctx, md, 20);
569 SHA1Final(md, &sha1ctx);
570 }
571
572 static int
573 carp_hmac_verify(struct carp_softc *sc, uint32_t counter[2],
574 unsigned char md[20])
575 {
576 unsigned char md2[20];
577
578 carp_hmac_generate(sc, counter, md2);
579 return (bcmp(md, md2, sizeof(md2)));
580 }
581
582 static void
583 carp_setroute(struct carp_softc *sc, int cmd)
584 {
585 #ifdef INET6
586 struct ifaddr_container *ifac;
587 #endif
588 struct carp_vhaddr *vha;
589
590 KKASSERT(cmd == RTM_DELETE || cmd == RTM_ADD);
591
592 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
593 if (vha->vha_iaback == NULL)
594 continue;
595 if (cmd == RTM_DELETE)
596 carp_delroute_vhaddr(sc, vha, FALSE);
597 else
598 carp_addroute_vhaddr(sc, vha);
599 }
600
601 #ifdef INET6
602 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
603 struct ifaddr *ifa = ifac->ifa;
604
605 if (ifa->ifa_addr->sa_family == AF_INET6) {
606 if (cmd == RTM_ADD)
607 in6_ifaddloop(ifa);
608 else
609 in6_ifremloop(ifa);
610 }
611 }
612 #endif /* INET6 */
613 }
614
615 static int
616 carp_clone_create(struct if_clone *ifc, int unit, caddr_t param __unused)
617 {
618 struct carp_softc *sc;
619 struct ifnet *ifp;
620
621 sc = kmalloc(sizeof(*sc), M_CARP, M_WAITOK | M_ZERO);
622 ifp = &sc->sc_if;
623
624 sc->sc_suppress = 0;
625 sc->sc_advbase = CARP_DFLTINTV;
626 sc->sc_vhid = -1; /* required setting */
627 sc->sc_advskew = 0;
628 sc->sc_init_counter = 1;
629 sc->sc_naddrs = 0;
630 sc->sc_naddrs6 = 0;
631
632 TAILQ_INIT(&sc->sc_vha_list);
633
634 #ifdef INET6
635 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
636 #endif
637
638 callout_init_mp(&sc->sc_ad_tmo);
639 netmsg_init(&sc->sc_ad_msg.base, NULL, &netisr_adone_rport,
640 MSGF_DROPABLE | MSGF_PRIORITY, carp_send_ad_timeout_dispatch);
641 sc->sc_ad_msg.nc_softc = sc;
642
643 callout_init_mp(&sc->sc_md_tmo);
644 callout_init_mp(&sc->sc_md6_tmo);
645 netmsg_init(&sc->sc_md_msg.base, NULL, &netisr_adone_rport,
646 MSGF_DROPABLE | MSGF_PRIORITY, carp_master_down_timeout_dispatch);
647 sc->sc_md_msg.nc_softc = sc;
648
649 if_initname(ifp, CARP_IFNAME, unit);
650 ifp->if_softc = sc;
651 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
652 ifp->if_init = carp_init;
653 ifp->if_ioctl = carp_ioctl;
654 ifp->if_start = carp_start;
655
656 ifp->if_capabilities = IFCAP_TXCSUM | IFCAP_TSO;
657 ifp->if_capenable = ifp->if_capabilities;
658 /*
659 * Leave if_hwassist as it is; if_hwassist will be
660 * setup when this carp interface has parent.
661 */
662
663 ifq_set_maxlen(&ifp->if_snd, ifqmaxlen);
664 ifq_set_ready(&ifp->if_snd);
665
666 ether_ifattach(ifp, carp_etheraddr, NULL);
667
668 ifp->if_type = IFT_CARP;
669 ifp->if_output = carp_output;
670
671 lwkt_gettoken(&carp_listtok);
672 LIST_INSERT_HEAD(&carpif_list, sc, sc_next);
673 lwkt_reltoken(&carp_listtok);
674
675 return (0);
676 }
677
678 static void
679 carp_clone_destroy_dispatch(netmsg_t msg)
680 {
681 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
682 struct carp_softc *sc = cmsg->nc_softc;
683
684 sc->sc_dead = TRUE;
685 carp_detach(sc, TRUE, FALSE);
686
687 callout_stop_sync(&sc->sc_ad_tmo);
688 callout_stop_sync(&sc->sc_md_tmo);
689 callout_stop_sync(&sc->sc_md6_tmo);
690
691 crit_enter();
692 lwkt_dropmsg(&sc->sc_ad_msg.base.lmsg);
693 lwkt_dropmsg(&sc->sc_md_msg.base.lmsg);
694 crit_exit();
695
696 lwkt_replymsg(&cmsg->base.lmsg, 0);
697 }
698
699 static int
700 carp_clone_destroy(struct ifnet *ifp)
701 {
702 struct carp_softc *sc = ifp->if_softc;
703 struct netmsg_carp cmsg;
704
705 bzero(&cmsg, sizeof(cmsg));
706 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
707 carp_clone_destroy_dispatch);
708 cmsg.nc_softc = sc;
709
710 lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
711
712 lwkt_gettoken(&carp_listtok);
713 LIST_REMOVE(sc, sc_next);
714 lwkt_reltoken(&carp_listtok);
715
716 bpfdetach(ifp);
717 if_detach(ifp);
718
719 KASSERT(sc->sc_naddrs == 0, ("certain inet address is still active"));
720 kfree(sc, M_CARP);
721
722 return 0;
723 }
724
725 static struct carp_if *
726 carp_if_remove(struct carp_if *ocif, struct carp_softc *sc)
727 {
728 struct carp_softc_container *oscc, *scc;
729 struct carp_if *cif;
730 int count = 0;
731 #ifdef INVARIANTS
732 int found = 0;
733 #endif
734
735 TAILQ_FOREACH(oscc, ocif, scc_link) {
736 ++count;
737 #ifdef INVARIANTS
738 if (oscc->scc_softc == sc)
739 found = 1;
740 #endif
741 }
742 KASSERT(found, ("%s carp_softc is not on carp_if", __func__));
743
744 if (count == 1) {
745 /* Last one is going to be unlinked */
746 return NULL;
747 }
748
749 cif = kmalloc(sizeof(*cif), M_CARP, M_WAITOK | M_ZERO);
750 TAILQ_INIT(cif);
751
752 TAILQ_FOREACH(oscc, ocif, scc_link) {
753 if (oscc->scc_softc == sc)
754 continue;
755
756 scc = kmalloc(sizeof(*scc), M_CARP, M_WAITOK | M_ZERO);
757 scc->scc_softc = oscc->scc_softc;
758 TAILQ_INSERT_TAIL(cif, scc, scc_link);
759 }
760
761 return cif;
762 }
763
764 static struct carp_if *
765 carp_if_insert(struct carp_if *ocif, struct carp_softc *sc)
766 {
767 struct carp_softc_container *oscc;
768 int onlist;
769
770 onlist = 0;
771 if (ocif != NULL) {
772 TAILQ_FOREACH(oscc, ocif, scc_link) {
773 if (oscc->scc_softc == sc)
774 onlist = 1;
775 }
776 }
777
778 #ifdef INVARIANTS
779 if (sc->sc_carpdev != NULL) {
780 KASSERT(onlist, ("%s is not on %s carp list",
781 sc->sc_if.if_xname, sc->sc_carpdev->if_xname));
782 } else {
783 KASSERT(!onlist, ("%s is already on carp list",
784 sc->sc_if.if_xname));
785 }
786 #endif
787
788 if (!onlist) {
789 struct carp_if *cif;
790 struct carp_softc_container *new_scc, *scc;
791 int inserted = 0;
792
793 cif = kmalloc(sizeof(*cif), M_CARP, M_WAITOK | M_ZERO);
794 TAILQ_INIT(cif);
795
796 new_scc = kmalloc(sizeof(*new_scc), M_CARP, M_WAITOK | M_ZERO);
797 new_scc->scc_softc = sc;
798
799 if (ocif != NULL) {
800 TAILQ_FOREACH(oscc, ocif, scc_link) {
801 if (!inserted &&
802 oscc->scc_softc->sc_vhid > sc->sc_vhid) {
803 TAILQ_INSERT_TAIL(cif, new_scc,
804 scc_link);
805 inserted = 1;
806 }
807
808 scc = kmalloc(sizeof(*scc), M_CARP,
809 M_WAITOK | M_ZERO);
810 scc->scc_softc = oscc->scc_softc;
811 TAILQ_INSERT_TAIL(cif, scc, scc_link);
812 }
813 }
814 if (!inserted)
815 TAILQ_INSERT_TAIL(cif, new_scc, scc_link);
816
817 return cif;
818 } else {
819 return ocif;
820 }
821 }
822
823 static void
824 carp_if_free(struct carp_if *cif)
825 {
826 struct carp_softc_container *scc;
827
828 while ((scc = TAILQ_FIRST(cif)) != NULL) {
829 TAILQ_REMOVE(cif, scc, scc_link);
830 kfree(scc, M_CARP);
831 }
832 kfree(cif, M_CARP);
833 }
834
835 static void
836 carp_detach(struct carp_softc *sc, boolean_t detach, boolean_t del_iaback)
837 {
838 carp_suspend(sc, detach);
839
840 carp_multicast_cleanup(sc);
841 #ifdef INET6
842 carp_multicast6_cleanup(sc);
843 #endif
844
845 if (!sc->sc_dead && detach) {
846 struct carp_vhaddr *vha;
847
848 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
849 carp_deactivate_vhaddr(sc, vha, del_iaback);
850 KKASSERT(sc->sc_naddrs == 0);
851 }
852
853 if (sc->sc_carpdev != NULL) {
854 struct ifnet *ifp = sc->sc_carpdev;
855 struct carp_if *ocif = ifp->if_carp;
856
857 ifp->if_carp = carp_if_remove(ocif, sc);
858 KASSERT(ifp->if_carp != ocif,
859 ("%s carp_if_remove failed", __func__));
860
861 sc->sc_carpdev = NULL;
862 sc->sc_ia = NULL;
863 sc->arpcom.ac_if.if_hwassist = 0;
864
865 /*
866 * Make sure that all protocol threads see the
867 * sc_carpdev and if_carp changes
868 */
869 netmsg_service_sync();
870
871 if (ifp->if_carp == NULL) {
872 /*
873 * No more carp interfaces using
874 * ifp as the backing interface,
875 * move it out of promiscous mode.
876 */
877 ifpromisc(ifp, 0);
878 }
879
880 /*
881 * The old carp list could be safely free now,
882 * since no one can access it.
883 */
884 carp_if_free(ocif);
885 }
886 }
887
888 static void
889 carp_ifdetach_dispatch(netmsg_t msg)
890 {
891 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
892 struct ifnet *ifp = cmsg->nc_carpdev;
893
894 while (ifp->if_carp) {
895 struct carp_softc_container *scc;
896
897 scc = TAILQ_FIRST((struct carp_if *)(ifp->if_carp));
898 carp_detach(scc->scc_softc, TRUE, TRUE);
899 }
900 lwkt_replymsg(&cmsg->base.lmsg, 0);
901 }
902
903 /* Detach an interface from the carp. */
904 static void
905 carp_ifdetach(void *arg __unused, struct ifnet *ifp)
906 {
907 struct netmsg_carp cmsg;
908
909 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp);
910
911 bzero(&cmsg, sizeof(cmsg));
912 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
913 carp_ifdetach_dispatch);
914 cmsg.nc_carpdev = ifp;
915
916 lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
917 }
918
919 /*
920 * process input packet.
921 * we have rearranged checks order compared to the rfc,
922 * but it seems more efficient this way or not possible otherwise.
923 */
924 int
925 carp_proto_input(struct mbuf **mp, int *offp, int proto)
926 {
927 struct mbuf *m = *mp;
928 struct ip *ip = mtod(m, struct ip *);
929 struct ifnet *ifp = m->m_pkthdr.rcvif;
930 struct carp_header *ch;
931 struct carp_softc *sc;
932 int len, iphlen;
933
934 iphlen = *offp;
935 *mp = NULL;
936
937 carpstats.carps_ipackets++;
938
939 if (!carp_opts[CARPCTL_ALLOW]) {
940 m_freem(m);
941 goto back;
942 }
943
944 /* Check if received on a valid carp interface */
945 if (ifp->if_type != IFT_CARP) {
946 carpstats.carps_badif++;
947 CARP_LOG("carp_proto_input: packet received on non-carp "
948 "interface: %s\n", ifp->if_xname);
949 m_freem(m);
950 goto back;
951 }
952
953 if (!CARP_IS_RUNNING(ifp)) {
954 carpstats.carps_badif++;
955 CARP_LOG("carp_proto_input: packet received on stopped carp "
956 "interface: %s\n", ifp->if_xname);
957 m_freem(m);
958 goto back;
959 }
960
961 sc = ifp->if_softc;
962 if (sc->sc_carpdev == NULL) {
963 carpstats.carps_badif++;
964 CARP_LOG("carp_proto_input: packet received on defunc carp "
965 "interface: %s\n", ifp->if_xname);
966 m_freem(m);
967 goto back;
968 }
969
970 if (!IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
971 carpstats.carps_badif++;
972 CARP_LOG("carp_proto_input: non-mcast packet on "
973 "interface: %s\n", ifp->if_xname);
974 m_freem(m);
975 goto back;
976 }
977
978 /* Verify that the IP TTL is CARP_DFLTTL. */
979 if (ip->ip_ttl != CARP_DFLTTL) {
980 carpstats.carps_badttl++;
981 CARP_LOG("carp_proto_input: received ttl %d != %d on %s\n",
982 ip->ip_ttl, CARP_DFLTTL, ifp->if_xname);
983 m_freem(m);
984 goto back;
985 }
986
987 /* Minimal CARP packet size */
988 len = iphlen + sizeof(*ch);
989
990 /*
991 * Verify that the received packet length is
992 * not less than the CARP header
993 */
994 if (m->m_pkthdr.len < len) {
995 carpstats.carps_badlen++;
996 CARP_LOG("packet too short %d on %s\n", m->m_pkthdr.len,
997 ifp->if_xname);
998 m_freem(m);
999 goto back;
1000 }
1001
1002 /* Make sure that CARP header is contiguous */
1003 if (len > m->m_len) {
1004 m = m_pullup(m, len);
1005 if (m == NULL) {
1006 carpstats.carps_hdrops++;
1007 CARP_LOG("carp_proto_input: m_pullup failed\n");
1008 goto back;
1009 }
1010 ip = mtod(m, struct ip *);
1011 }
1012 ch = (struct carp_header *)((uint8_t *)ip + iphlen);
1013
1014 /* Verify the CARP checksum */
1015 if (in_cksum_skip(m, len, iphlen)) {
1016 carpstats.carps_badsum++;
1017 CARP_LOG("carp_proto_input: checksum failed on %s\n",
1018 ifp->if_xname);
1019 m_freem(m);
1020 goto back;
1021 }
1022 carp_proto_input_c(sc, m, ch, AF_INET);
1023 back:
1024 return(IPPROTO_DONE);
1025 }
1026
1027 #ifdef INET6
1028 int
1029 carp6_proto_input(struct mbuf **mp, int *offp, int proto)
1030 {
1031 struct mbuf *m = *mp;
1032 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1033 struct ifnet *ifp = m->m_pkthdr.rcvif;
1034 struct carp_header *ch;
1035 struct carp_softc *sc;
1036 u_int len;
1037
1038 carpstats.carps_ipackets6++;
1039
1040 if (!carp_opts[CARPCTL_ALLOW]) {
1041 m_freem(m);
1042 goto back;
1043 }
1044
1045 /* check if received on a valid carp interface */
1046 if (ifp->if_type != IFT_CARP) {
1047 carpstats.carps_badif++;
1048 CARP_LOG("carp6_proto_input: packet received on non-carp "
1049 "interface: %s\n", ifp->if_xname);
1050 m_freem(m);
1051 goto back;
1052 }
1053
1054 if (!CARP_IS_RUNNING(ifp)) {
1055 carpstats.carps_badif++;
1056 CARP_LOG("carp_proto_input: packet received on stopped carp "
1057 "interface: %s\n", ifp->if_xname);
1058 m_freem(m);
1059 goto back;
1060 }
1061
1062 sc = ifp->if_softc;
1063 if (sc->sc_carpdev == NULL) {
1064 carpstats.carps_badif++;
1065 CARP_LOG("carp6_proto_input: packet received on defunc-carp "
1066 "interface: %s\n", ifp->if_xname);
1067 m_freem(m);
1068 goto back;
1069 }
1070
1071 /* verify that the IP TTL is 255 */
1072 if (ip6->ip6_hlim != CARP_DFLTTL) {
1073 carpstats.carps_badttl++;
1074 CARP_LOG("carp6_proto_input: received ttl %d != 255 on %s\n",
1075 ip6->ip6_hlim, ifp->if_xname);
1076 m_freem(m);
1077 goto back;
1078 }
1079
1080 /* verify that we have a complete carp packet */
1081 len = m->m_len;
1082 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
1083 if (ch == NULL) {
1084 carpstats.carps_badlen++;
1085 CARP_LOG("carp6_proto_input: packet size %u too small\n", len);
1086 goto back;
1087 }
1088
1089 /* verify the CARP checksum */
1090 if (in_cksum_range(m, 0, *offp, sizeof(*ch))) {
1091 carpstats.carps_badsum++;
1092 CARP_LOG("carp6_proto_input: checksum failed, on %s\n",
1093 ifp->if_xname);
1094 m_freem(m);
1095 goto back;
1096 }
1097
1098 carp_proto_input_c(sc, m, ch, AF_INET6);
1099 back:
1100 return (IPPROTO_DONE);
1101 }
1102 #endif /* INET6 */
1103
1104 static void
1105 carp_proto_input_c(struct carp_softc *sc, struct mbuf *m,
1106 struct carp_header *ch, sa_family_t af)
1107 {
1108 struct ifnet *cifp;
1109 uint64_t tmp_counter;
1110 struct timeval sc_tv, ch_tv;
1111
1112 if (sc->sc_vhid != ch->carp_vhid) {
1113 /*
1114 * CARP uses multicast, however, multicast packets
1115 * are tapped to all CARP interfaces on the physical
1116 * interface receiving the CARP packets, so we don't
1117 * update any stats here.
1118 */
1119 m_freem(m);
1120 return;
1121 }
1122 cifp = &sc->sc_if;
1123
1124 /* verify the CARP version. */
1125 if (ch->carp_version != CARP_VERSION) {
1126 carpstats.carps_badver++;
1127 CARP_LOG("%s; invalid version %d\n", cifp->if_xname,
1128 ch->carp_version);
1129 m_freem(m);
1130 return;
1131 }
1132
1133 /* verify the hash */
1134 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
1135 carpstats.carps_badauth++;
1136 CARP_LOG("%s: incorrect hash\n", cifp->if_xname);
1137 m_freem(m);
1138 return;
1139 }
1140
1141 tmp_counter = ntohl(ch->carp_counter[0]);
1142 tmp_counter = tmp_counter<<32;
1143 tmp_counter += ntohl(ch->carp_counter[1]);
1144
1145 /* XXX Replay protection goes here */
1146
1147 sc->sc_init_counter = 0;
1148 sc->sc_counter = tmp_counter;
1149
1150 sc_tv.tv_sec = sc->sc_advbase;
1151 if (carp_suppress_preempt && sc->sc_advskew < 240)
1152 sc_tv.tv_usec = 240 * 1000000 / 256;
1153 else
1154 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1155 ch_tv.tv_sec = ch->carp_advbase;
1156 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
1157
1158 switch (sc->sc_state) {
1159 case INIT:
1160 break;
1161
1162 case MASTER:
1163 /*
1164 * If we receive an advertisement from a master who's going to
1165 * be more frequent than us, go into BACKUP state.
1166 */
1167 if (timevalcmp(&sc_tv, &ch_tv, >) ||
1168 timevalcmp(&sc_tv, &ch_tv, ==)) {
1169 callout_stop(&sc->sc_ad_tmo);
1170 CARP_DEBUG("%s: MASTER -> BACKUP "
1171 "(more frequent advertisement received)\n",
1172 cifp->if_xname);
1173 carp_set_state(sc, BACKUP);
1174 carp_setrun(sc, 0);
1175 carp_setroute(sc, RTM_DELETE);
1176 }
1177 break;
1178
1179 case BACKUP:
1180 /*
1181 * If we're pre-empting masters who advertise slower than us,
1182 * and this one claims to be slower, treat him as down.
1183 */
1184 if (carp_opts[CARPCTL_PREEMPT] &&
1185 timevalcmp(&sc_tv, &ch_tv, <)) {
1186 CARP_DEBUG("%s: BACKUP -> MASTER "
1187 "(preempting a slower master)\n", cifp->if_xname);
1188 carp_master_down(sc);
1189 break;
1190 }
1191
1192 /*
1193 * If the master is going to advertise at such a low frequency
1194 * that he's guaranteed to time out, we'd might as well just
1195 * treat him as timed out now.
1196 */
1197 sc_tv.tv_sec = sc->sc_advbase * 3;
1198 if (timevalcmp(&sc_tv, &ch_tv, <)) {
1199 CARP_DEBUG("%s: BACKUP -> MASTER (master timed out)\n",
1200 cifp->if_xname);
1201 carp_master_down(sc);
1202 break;
1203 }
1204
1205 /*
1206 * Otherwise, we reset the counter and wait for the next
1207 * advertisement.
1208 */
1209 carp_setrun(sc, af);
1210 break;
1211 }
1212 m_freem(m);
1213 }
1214
1215 struct mbuf *
1216 carp_input(void *v, struct mbuf *m)
1217 {
1218 struct carp_if *cif = v;
1219 struct ether_header *eh;
1220 struct carp_softc_container *scc;
1221 struct ifnet *ifp;
1222
1223 eh = mtod(m, struct ether_header *);
1224
1225 ifp = carp_forus(cif, eh->ether_dhost);
1226 if (ifp != NULL) {
1227 ether_reinput_oncpu(ifp, m, REINPUT_RUNBPF);
1228 return NULL;
1229 }
1230
1231 if ((m->m_flags & (M_BCAST | M_MCAST)) == 0)
1232 return m;
1233
1234 /*
1235 * XXX Should really check the list of multicast addresses
1236 * for each CARP interface _before_ copying.
1237 */
1238 TAILQ_FOREACH(scc, cif, scc_link) {
1239 struct carp_softc *sc = scc->scc_softc;
1240 struct mbuf *m0;
1241
1242 if ((sc->sc_if.if_flags & IFF_UP) == 0)
1243 continue;
1244
1245 m0 = m_dup(m, M_NOWAIT);
1246 if (m0 == NULL)
1247 continue;
1248
1249 ether_reinput_oncpu(&sc->sc_if, m0, REINPUT_RUNBPF);
1250 }
1251 return m;
1252 }
1253
1254 static void
1255 carp_prepare_ad(struct carp_softc *sc, struct carp_header *ch)
1256 {
1257 if (sc->sc_init_counter) {
1258 /* this could also be seconds since unix epoch */
1259 sc->sc_counter = karc4random();
1260 sc->sc_counter = sc->sc_counter << 32;
1261 sc->sc_counter += karc4random();
1262 } else {
1263 sc->sc_counter++;
1264 }
1265
1266 ch->carp_counter[0] = htonl((sc->sc_counter >> 32) & 0xffffffff);
1267 ch->carp_counter[1] = htonl(sc->sc_counter & 0xffffffff);
1268
1269 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
1270 }
1271
1272 static void
1273 carp_send_ad_all(void)
1274 {
1275 struct carp_softc *sc;
1276
1277 LIST_FOREACH(sc, &carpif_list, sc_next) {
1278 if (sc->sc_carpdev == NULL)
1279 continue;
1280
1281 if (CARP_IS_RUNNING(&sc->sc_if) && sc->sc_state == MASTER)
1282 carp_send_ad(sc);
1283 }
1284 }
1285
1286 static void
1287 carp_send_ad_timeout(void *xsc)
1288 {
1289 struct carp_softc *sc = xsc;
1290 struct netmsg_carp *cmsg = &sc->sc_ad_msg;
1291
1292 KASSERT(mycpuid == 0, ("%s not on cpu0 but on cpu%d",
1293 __func__, mycpuid));
1294
1295 crit_enter();
1296 if (cmsg->base.lmsg.ms_flags & MSGF_DONE)
1297 lwkt_sendmsg_oncpu(netisr_cpuport(0), &cmsg->base.lmsg);
1298 crit_exit();
1299 }
1300
1301 static void
1302 carp_send_ad_timeout_dispatch(netmsg_t msg)
1303 {
1304 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
1305 struct carp_softc *sc = cmsg->nc_softc;
1306
1307 /* Reply ASAP */
1308 crit_enter();
1309 lwkt_replymsg(&cmsg->base.lmsg, 0);
1310 crit_exit();
1311
1312 carp_send_ad(sc);
1313 }
1314
1315 static void
1316 carp_send_ad(struct carp_softc *sc)
1317 {
1318 struct ifnet *cifp = &sc->sc_if;
1319 struct carp_header ch;
1320 struct timeval tv;
1321 struct carp_header *ch_ptr;
1322 struct mbuf *m;
1323 int len, advbase, advskew;
1324
1325 if (!CARP_IS_RUNNING(cifp)) {
1326 /* Bow out */
1327 advbase = 255;
1328 advskew = 255;
1329 } else {
1330 advbase = sc->sc_advbase;
1331 if (!carp_suppress_preempt || sc->sc_advskew > 240)
1332 advskew = sc->sc_advskew;
1333 else
1334 advskew = 240;
1335 tv.tv_sec = advbase;
1336 tv.tv_usec = advskew * 1000000 / 256;
1337 }
1338
1339 ch.carp_version = CARP_VERSION;
1340 ch.carp_type = CARP_ADVERTISEMENT;
1341 ch.carp_vhid = sc->sc_vhid;
1342 ch.carp_advbase = advbase;
1343 ch.carp_advskew = advskew;
1344 ch.carp_authlen = 7; /* XXX DEFINE */
1345 ch.carp_pad1 = 0; /* must be zero */
1346 ch.carp_cksum = 0;
1347
1348 #ifdef INET
1349 if (sc->sc_ia != NULL) {
1350 struct ip *ip;
1351
1352 MGETHDR(m, M_NOWAIT, MT_HEADER);
1353 if (m == NULL) {
1354 IFNET_STAT_INC(cifp, oerrors, 1);
1355 carpstats.carps_onomem++;
1356 /* XXX maybe less ? */
1357 if (advbase != 255 || advskew != 255)
1358 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1359 carp_send_ad_timeout, sc);
1360 return;
1361 }
1362 len = sizeof(*ip) + sizeof(ch);
1363 m->m_pkthdr.len = len;
1364 m->m_pkthdr.rcvif = NULL;
1365 m->m_len = len;
1366 MH_ALIGN(m, m->m_len);
1367 m->m_flags |= M_MCAST;
1368 if (carp_prio_ad)
1369 m->m_flags |= M_PRIO;
1370 ip = mtod(m, struct ip *);
1371 ip->ip_v = IPVERSION;
1372 ip->ip_hl = sizeof(*ip) >> 2;
1373 ip->ip_tos = IPTOS_LOWDELAY;
1374 ip->ip_len = len;
1375 ip->ip_id = ip_newid();
1376 ip->ip_off = IP_DF;
1377 ip->ip_ttl = CARP_DFLTTL;
1378 ip->ip_p = IPPROTO_CARP;
1379 ip->ip_sum = 0;
1380 ip->ip_src = sc->sc_ia->ia_addr.sin_addr;
1381 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
1382
1383 ch_ptr = (struct carp_header *)(&ip[1]);
1384 bcopy(&ch, ch_ptr, sizeof(ch));
1385 carp_prepare_ad(sc, ch_ptr);
1386 ch_ptr->carp_cksum = in_cksum_skip(m, len, sizeof(*ip));
1387
1388 getmicrotime(&cifp->if_lastchange);
1389 IFNET_STAT_INC(cifp, opackets, 1);
1390 IFNET_STAT_INC(cifp, obytes, len);
1391 carpstats.carps_opackets++;
1392
1393 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) {
1394 IFNET_STAT_INC(cifp, oerrors, 1);
1395 if (sc->sc_sendad_errors < INT_MAX)
1396 sc->sc_sendad_errors++;
1397 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1398 carp_suppress_preempt++;
1399 if (carp_suppress_preempt == 1) {
1400 carp_send_ad_all();
1401 }
1402 }
1403 sc->sc_sendad_success = 0;
1404 } else {
1405 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1406 if (++sc->sc_sendad_success >=
1407 CARP_SENDAD_MIN_SUCCESS) {
1408 carp_suppress_preempt--;
1409 sc->sc_sendad_errors = 0;
1410 }
1411 } else {
1412 sc->sc_sendad_errors = 0;
1413 }
1414 }
1415 }
1416 #endif /* INET */
1417 #ifdef INET6
1418 if (sc->sc_ia6) {
1419 struct ip6_hdr *ip6;
1420
1421 MGETHDR(m, M_NOWAIT, MT_HEADER);
1422 if (m == NULL) {
1423 IFNET_STAT_INC(cifp, oerrors, 1);
1424 carpstats.carps_onomem++;
1425 /* XXX maybe less ? */
1426 if (advbase != 255 || advskew != 255)
1427 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1428 carp_send_ad_timeout, sc);
1429 return;
1430 }
1431 len = sizeof(*ip6) + sizeof(ch);
1432 m->m_pkthdr.len = len;
1433 m->m_pkthdr.rcvif = NULL;
1434 m->m_len = len;
1435 MH_ALIGN(m, m->m_len);
1436 m->m_flags |= M_MCAST;
1437 ip6 = mtod(m, struct ip6_hdr *);
1438 bzero(ip6, sizeof(*ip6));
1439 ip6->ip6_vfc |= IPV6_VERSION;
1440 ip6->ip6_hlim = CARP_DFLTTL;
1441 ip6->ip6_nxt = IPPROTO_CARP;
1442 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src,
1443 sizeof(struct in6_addr));
1444 /* set the multicast destination */
1445
1446 ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
1447 ip6->ip6_dst.s6_addr8[15] = 0x12;
1448 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
1449 IFNET_STAT_INC(cifp, oerrors, 1);
1450 m_freem(m);
1451 CARP_LOG("%s: in6_setscope failed\n", __func__);
1452 return;
1453 }
1454
1455 ch_ptr = (struct carp_header *)(&ip6[1]);
1456 bcopy(&ch, ch_ptr, sizeof(ch));
1457 carp_prepare_ad(sc, ch_ptr);
1458 ch_ptr->carp_cksum = in_cksum_skip(m, len, sizeof(*ip6));
1459
1460 getmicrotime(&cifp->if_lastchange);
1461 IFNET_STAT_INC(cifp, opackets, 1);
1462 IFNET_STAT_INC(cifp, obytes, len);
1463 carpstats.carps_opackets6++;
1464
1465 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) {
1466 IFNET_STAT_INC(cifp, oerrors, 1);
1467 if (sc->sc_sendad_errors < INT_MAX)
1468 sc->sc_sendad_errors++;
1469 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1470 carp_suppress_preempt++;
1471 if (carp_suppress_preempt == 1) {
1472 carp_send_ad_all();
1473 }
1474 }
1475 sc->sc_sendad_success = 0;
1476 } else {
1477 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1478 if (++sc->sc_sendad_success >=
1479 CARP_SENDAD_MIN_SUCCESS) {
1480 carp_suppress_preempt--;
1481 sc->sc_sendad_errors = 0;
1482 }
1483 } else {
1484 sc->sc_sendad_errors = 0;
1485 }
1486 }
1487 }
1488 #endif /* INET6 */
1489
1490 if (advbase != 255 || advskew != 255)
1491 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1492 carp_send_ad_timeout, sc);
1493 }
1494
1495 /*
1496 * Broadcast a gratuitous ARP request containing
1497 * the virtual router MAC address for each IP address
1498 * associated with the virtual router.
1499 */
1500 static void
1501 carp_send_arp(struct carp_softc *sc)
1502 {
1503 const struct carp_vhaddr *vha;
1504
1505 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1506 if (vha->vha_iaback == NULL)
1507 continue;
1508 arp_gratuitous(&sc->sc_if, &vha->vha_ia->ia_ifa);
1509 }
1510 }
1511
1512 #ifdef INET6
1513 static void
1514 carp_send_na(struct carp_softc *sc)
1515 {
1516 struct ifaddr_container *ifac;
1517 struct in6_addr *in6;
1518 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1519
1520 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
1521 struct ifaddr *ifa = ifac->ifa;
1522
1523 if (ifa->ifa_addr->sa_family != AF_INET6)
1524 continue;
1525
1526 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
1527 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1528 ND_NA_FLAG_OVERRIDE, 1, NULL);
1529 DELAY(1000); /* XXX */
1530 }
1531 }
1532 #endif /* INET6 */
1533
1534 static __inline const struct carp_vhaddr *
1535 carp_find_addr(const struct carp_softc *sc, const struct in_addr *addr)
1536 {
1537 struct carp_vhaddr *vha;
1538
1539 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1540 if (vha->vha_iaback == NULL)
1541 continue;
1542
1543 if (vha->vha_ia->ia_addr.sin_addr.s_addr == addr->s_addr)
1544 return vha;
1545 }
1546 return NULL;
1547 }
1548
1549 #ifdef notyet
1550 static int
1551 carp_iamatch_balance(const struct carp_if *cif, const struct in_addr *itaddr,
1552 const struct in_addr *isaddr, uint8_t **enaddr)
1553 {
1554 const struct carp_softc *vh;
1555 int index, count = 0;
1556
1557 /*
1558 * XXX proof of concept implementation.
1559 * We use the source ip to decide which virtual host should
1560 * handle the request. If we're master of that virtual host,
1561 * then we respond, otherwise, just drop the arp packet on
1562 * the floor.
1563 */
1564
1565 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1566 if (!CARP_IS_RUNNING(&vh->sc_if))
1567 continue;
1568
1569 if (carp_find_addr(vh, itaddr) != NULL)
1570 count++;
1571 }
1572 if (count == 0)
1573 return 0;
1574
1575 /* this should be a hash, like pf_hash() */
1576 index = ntohl(isaddr->s_addr) % count;
1577 count = 0;
1578
1579 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1580 if (!CARP_IS_RUNNING(&vh->sc_if))
1581 continue;
1582
1583 if (carp_find_addr(vh, itaddr) == NULL)
1584 continue;
1585
1586 if (count == index) {
1587 if (vh->sc_state == MASTER) {
1588 *enaddr = IF_LLADDR(&vh->sc_if);
1589 return 1;
1590 } else {
1591 return 0;
1592 }
1593 }
1594 count++;
1595 }
1596 return 0;
1597 }
1598 #endif
1599
1600 int
1601 carp_iamatch(const struct in_ifaddr *ia)
1602 {
1603 const struct carp_softc *sc = ia->ia_ifp->if_softc;
1604
1605 ASSERT_IN_NETISR(0);
1606
1607 #ifdef notyet
1608 if (carp_opts[CARPCTL_ARPBALANCE])
1609 return carp_iamatch_balance(cif, itaddr, isaddr, enaddr);
1610 #endif
1611
1612 if (!CARP_IS_RUNNING(&sc->sc_if) || sc->sc_state != MASTER)
1613 return 0;
1614
1615 return 1;
1616 }
1617
1618 #ifdef INET6
1619 struct ifaddr *
1620 carp_iamatch6(void *v, struct in6_addr *taddr)
1621 {
1622 #ifdef foo
1623 struct carp_if *cif = v;
1624 struct carp_softc *vh;
1625
1626 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1627 struct ifaddr_container *ifac;
1628
1629 TAILQ_FOREACH(ifac, &vh->sc_if.if_addrheads[mycpuid],
1630 ifa_link) {
1631 struct ifaddr *ifa = ifac->ifa;
1632
1633 if (IN6_ARE_ADDR_EQUAL(taddr,
1634 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1635 CARP_IS_RUNNING(&vh->sc_if) &&
1636 vh->sc_state == MASTER) {
1637 return (ifa);
1638 }
1639 }
1640 }
1641 #endif
1642 return (NULL);
1643 }
1644
1645 void *
1646 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr)
1647 {
1648 #ifdef foo
1649 struct m_tag *mtag;
1650 struct carp_if *cif = v;
1651 struct carp_softc *sc;
1652
1653 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
1654 struct ifaddr_container *ifac;
1655
1656 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid],
1657 ifa_link) {
1658 struct ifaddr *ifa = ifac->ifa;
1659
1660 if (IN6_ARE_ADDR_EQUAL(taddr,
1661 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1662 CARP_IS_RUNNING(&sc->sc_if)) {
1663 struct ifnet *ifp = &sc->sc_if;
1664
1665 mtag = m_tag_get(PACKET_TAG_CARP,
1666 sizeof(struct ifnet *), M_NOWAIT);
1667 if (mtag == NULL) {
1668 /* better a bit than nothing */
1669 return (IF_LLADDR(ifp));
1670 }
1671 bcopy(&ifp, (caddr_t)(mtag + 1),
1672 sizeof(struct ifnet *));
1673 m_tag_prepend(m, mtag);
1674
1675 return (IF_LLADDR(ifp));
1676 }
1677 }
1678 }
1679 #endif
1680 return (NULL);
1681 }
1682 #endif
1683
1684 static struct ifnet *
1685 carp_forus(struct carp_if *cif, const uint8_t *dhost)
1686 {
1687 struct carp_softc_container *scc;
1688
1689 if (memcmp(dhost, carp_etheraddr, ETHER_ADDR_LEN - 1) != 0)
1690 return NULL;
1691
1692 TAILQ_FOREACH(scc, cif, scc_link) {
1693 struct carp_softc *sc = scc->scc_softc;
1694 struct ifnet *ifp = &sc->sc_if;
1695
1696 if (CARP_IS_RUNNING(ifp) && sc->sc_state == MASTER &&
1697 !bcmp(dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN))
1698 return ifp;
1699 }
1700 return NULL;
1701 }
1702
1703 static void
1704 carp_master_down_timeout(void *xsc)
1705 {
1706 struct carp_softc *sc = xsc;
1707 struct netmsg_carp *cmsg = &sc->sc_md_msg;
1708
1709 KASSERT(mycpuid == 0, ("%s not on cpu0 but on cpu%d",
1710 __func__, mycpuid));
1711
1712 crit_enter();
1713 if (cmsg->base.lmsg.ms_flags & MSGF_DONE)
1714 lwkt_sendmsg_oncpu(netisr_cpuport(0), &cmsg->base.lmsg);
1715 crit_exit();
1716 }
1717
1718 static void
1719 carp_master_down_timeout_dispatch(netmsg_t msg)
1720 {
1721 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
1722 struct carp_softc *sc = cmsg->nc_softc;
1723
1724 /* Reply ASAP */
1725 crit_enter();
1726 lwkt_replymsg(&cmsg->base.lmsg, 0);
1727 crit_exit();
1728
1729 CARP_DEBUG("%s: BACKUP -> MASTER (master timed out)\n",
1730 sc->sc_if.if_xname);
1731 carp_master_down(sc);
1732 }
1733
1734 static void
1735 carp_master_down(struct carp_softc *sc)
1736 {
1737 switch (sc->sc_state) {
1738 case INIT:
1739 kprintf("%s: master_down event in INIT state\n",
1740 sc->sc_if.if_xname);
1741 break;
1742
1743 case MASTER:
1744 break;
1745
1746 case BACKUP:
1747 carp_set_state(sc, MASTER);
1748 carp_send_ad(sc);
1749 carp_send_arp(sc);
1750 #ifdef INET6
1751 carp_send_na(sc);
1752 #endif /* INET6 */
1753 carp_setrun(sc, 0);
1754 carp_setroute(sc, RTM_ADD);
1755 break;
1756 }
1757 }
1758
1759 /*
1760 * When in backup state, af indicates whether to reset the master down timer
1761 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1762 */
1763 static void
1764 carp_setrun(struct carp_softc *sc, sa_family_t af)
1765 {
1766 struct ifnet *cifp = &sc->sc_if;
1767 struct timeval tv;
1768
1769 if (sc->sc_carpdev == NULL) {
1770 carp_set_state(sc, INIT);
1771 return;
1772 }
1773
1774 if ((cifp->if_flags & IFF_RUNNING) && sc->sc_vhid > 0 &&
1775 (sc->sc_naddrs || sc->sc_naddrs6)) {
1776 /* Nothing */
1777 } else {
1778 carp_setroute(sc, RTM_DELETE);
1779 return;
1780 }
1781
1782 switch (sc->sc_state) {
1783 case INIT:
1784 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) {
1785 carp_send_ad(sc);
1786 carp_send_arp(sc);
1787 #ifdef INET6
1788 carp_send_na(sc);
1789 #endif /* INET6 */
1790 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n",
1791 cifp->if_xname);
1792 carp_set_state(sc, MASTER);
1793 carp_setroute(sc, RTM_ADD);
1794 } else {
1795 CARP_DEBUG("%s: INIT -> BACKUP\n", cifp->if_xname);
1796 carp_set_state(sc, BACKUP);
1797 carp_setroute(sc, RTM_DELETE);
1798 carp_setrun(sc, 0);
1799 }
1800 break;
1801
1802 case BACKUP:
1803 callout_stop(&sc->sc_ad_tmo);
1804 tv.tv_sec = 3 * sc->sc_advbase;
1805 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1806 switch (af) {
1807 #ifdef INET
1808 case AF_INET:
1809 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
1810 carp_master_down_timeout, sc);
1811 break;
1812 #endif /* INET */
1813 #ifdef INET6
1814 case AF_INET6:
1815 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
1816 carp_master_down_timeout, sc);
1817 break;
1818 #endif /* INET6 */
1819 default:
1820 if (sc->sc_naddrs)
1821 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
1822 carp_master_down_timeout, sc);
1823 if (sc->sc_naddrs6)
1824 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
1825 carp_master_down_timeout, sc);
1826 break;
1827 }
1828 break;
1829
1830 case MASTER:
1831 tv.tv_sec = sc->sc_advbase;
1832 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1833 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1834 carp_send_ad_timeout, sc);
1835 break;
1836 }
1837 }
1838
1839 static void
1840 carp_multicast_cleanup(struct carp_softc *sc)
1841 {
1842 struct ip_moptions *imo = &sc->sc_imo;
1843
1844 if (imo->imo_num_memberships == 0)
1845 return;
1846 KKASSERT(imo->imo_num_memberships == 1);
1847
1848 in_delmulti(imo->imo_membership[0]);
1849 imo->imo_membership[0] = NULL;
1850 imo->imo_num_memberships = 0;
1851 imo->imo_multicast_ifp = NULL;
1852 }
1853
1854 #ifdef INET6
1855 static void
1856 carp_multicast6_cleanup(struct carp_softc *sc)
1857 {
1858 struct ip6_moptions *im6o = &sc->sc_im6o;
1859
1860 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1861 struct in6_multi_mship *imm =
1862 LIST_FIRST(&im6o->im6o_memberships);
1863
1864 LIST_REMOVE(imm, i6mm_chain);
1865 in6_leavegroup(imm);
1866 }
1867 im6o->im6o_multicast_ifp = NULL;
1868 }
1869 #endif
1870
1871 static void
1872 carp_ioctl_getvhaddr_dispatch(netmsg_t msg)
1873 {
1874 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
1875 struct carp_softc *sc = cmsg->nc_softc;
1876 const struct carp_vhaddr *vha;
1877 struct ifcarpvhaddr *carpa, *carpa0;
1878 int count, len, error = 0;
1879
1880 count = 0;
1881 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
1882 ++count;
1883
1884 if (cmsg->nc_datalen == 0) {
1885 cmsg->nc_datalen = count * sizeof(*carpa);
1886 goto back;
1887 } else if (count == 0 || cmsg->nc_datalen < sizeof(*carpa)) {
1888 cmsg->nc_datalen = 0;
1889 goto back;
1890 }
1891 len = min(cmsg->nc_datalen, sizeof(*carpa) * count);
1892 KKASSERT(len >= sizeof(*carpa));
1893
1894 carpa0 = carpa = kmalloc(len, M_TEMP, M_WAITOK | M_NULLOK | M_ZERO);
1895 if (carpa == NULL) {
1896 error = ENOMEM;
1897 goto back;
1898 }
1899
1900 count = 0;
1901 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1902 if (len < sizeof(*carpa))
1903 break;
1904
1905 carpa->carpa_flags = vha->vha_flags;
1906 carpa->carpa_addr.sin_family = AF_INET;
1907 carpa->carpa_addr.sin_addr = vha->vha_ia->ia_addr.sin_addr;
1908
1909 carpa->carpa_baddr.sin_family = AF_INET;
1910 if (vha->vha_iaback == NULL) {
1911 carpa->carpa_baddr.sin_addr.s_addr = INADDR_ANY;
1912 } else {
1913 carpa->carpa_baddr.sin_addr =
1914 vha->vha_iaback->ia_addr.sin_addr;
1915 }
1916
1917 ++carpa;
1918 ++count;
1919 len -= sizeof(*carpa);
1920 }
1921 cmsg->nc_datalen = sizeof(*carpa) * count;
1922 KKASSERT(cmsg->nc_datalen > 0);
1923
1924 cmsg->nc_data = carpa0;
1925
1926 back:
1927 lwkt_replymsg(&cmsg->base.lmsg, error);
1928 }
1929
1930 static int
1931 carp_ioctl_getvhaddr(struct carp_softc *sc, struct ifdrv *ifd)
1932 {
1933 struct ifnet *ifp = &sc->arpcom.ac_if;
1934 struct netmsg_carp cmsg;
1935 int error;
1936
1937 ASSERT_IFNET_SERIALIZED_ALL(ifp);
1938 ifnet_deserialize_all(ifp);
1939
1940 bzero(&cmsg, sizeof(cmsg));
1941 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
1942 carp_ioctl_getvhaddr_dispatch);
1943 cmsg.nc_softc = sc;
1944 cmsg.nc_datalen = ifd->ifd_len;
1945
1946 error = lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
1947
1948 if (!error) {
1949 if (cmsg.nc_data != NULL) {
1950 error = copyout(cmsg.nc_data, ifd->ifd_data,
1951 cmsg.nc_datalen);
1952 kfree(cmsg.nc_data, M_TEMP);
1953 }
1954 ifd->ifd_len = cmsg.nc_datalen;
1955 } else {
1956 KASSERT(cmsg.nc_data == NULL,
1957 ("%s temp vhaddr is alloc upon error", __func__));
1958 }
1959
1960 ifnet_serialize_all(ifp);
1961 return error;
1962 }
1963
1964 static int
1965 carp_config_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
1966 struct in_ifaddr *ia_del)
1967 {
1968 struct ifnet *ifp;
1969 struct in_ifaddr *ia_if;
1970 const struct in_ifaddr *ia_vha;
1971 struct in_ifaddr_container *iac;
1972 int own, ia_match_carpdev;
1973
1974 KKASSERT(vha->vha_ia != NULL);
1975 ia_vha = vha->vha_ia;
1976
1977 ia_if = NULL;
1978 own = 0;
1979 ia_match_carpdev = 0;
1980 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1981 struct in_ifaddr *ia = iac->ia;
1982
1983 if (ia == ia_del)
1984 continue;
1985
1986 if (ia->ia_ifp->if_type == IFT_CARP)
1987 continue;
1988
1989 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
1990 continue;
1991
1992 /* and, yeah, we need a multicast-capable iface too */
1993 if ((ia->ia_ifp->if_flags & IFF_MULTICAST) == 0)
1994 continue;
1995
1996 if (ia_vha->ia_subnetmask == ia->ia_subnetmask &&
1997 ia_vha->ia_subnet == ia->ia_subnet) {
1998 if (ia_vha->ia_addr.sin_addr.s_addr ==
1999 ia->ia_addr.sin_addr.s_addr)
2000 own = 1;
2001 if (ia_if == NULL) {
2002 ia_if = ia;
2003 } else if (sc->sc_carpdev != NULL &&
2004 sc->sc_carpdev == ia->ia_ifp) {
2005 ia_if = ia;
2006 if (ia_if->ia_flags & IFA_ROUTE) {
2007 /*
2008 * Address with prefix route
2009 * is prefered
2010 */
2011 break;
2012 }
2013 ia_match_carpdev = 1;
2014 } else if (!ia_match_carpdev) {
2015 if (ia->ia_flags & IFA_ROUTE) {
2016 /*
2017 * Address with prefix route
2018 * is prefered over others.
2019 */
2020 ia_if = ia;
2021 }
2022 }
2023 }
2024 }
2025
2026 carp_deactivate_vhaddr(sc, vha, FALSE);
2027 if (!ia_if)
2028 return ENOENT;
2029
2030 ifp = ia_if->ia_ifp;
2031
2032 /* XXX Don't allow parent iface to be changed */
2033 if (sc->sc_carpdev != NULL && sc->sc_carpdev != ifp)
2034 return EEXIST;
2035
2036 return carp_activate_vhaddr(sc, vha, ifp, ia_if, own);
2037 }
2038
2039 static void
2040 carp_add_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
2041 {
2042 struct carp_vhaddr *vha_new;
2043 struct in_ifaddr *carp_ia;
2044 #ifdef INVARIANTS
2045 struct carp_vhaddr *vha;
2046 #endif
2047
2048 KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
2049 carp_ia = ifatoia(carp_ifa);
2050
2051 #ifdef INVARIANTS
2052 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
2053 KKASSERT(vha->vha_ia != NULL && vha->vha_ia != carp_ia);
2054 #endif
2055
2056 vha_new = kmalloc(sizeof(*vha_new), M_CARP, M_WAITOK | M_ZERO);
2057 vha_new->vha_ia = carp_ia;
2058 carp_insert_vhaddr(sc, vha_new);
2059
2060 if (carp_config_vhaddr(sc, vha_new, NULL) != 0) {
2061 /*
2062 * If the above configuration fails, it may only mean
2063 * that the new address is problematic. However, the
2064 * carp(4) interface may already have several working
2065 * addresses. Since the expected behaviour of
2066 * SIOC[AS]IFADDR is to put the NIC into working state,
2067 * we try starting the state machine manually here with
2068 * the hope that the carp(4)'s previously working
2069 * addresses still could be brought up.
2070 */
2071 carp_hmac_prepare(sc);
2072 carp_set_state(sc, INIT);
2073 carp_setrun(sc, 0);
2074 }
2075 }
2076
2077 static void
2078 carp_del_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
2079 {
2080 struct carp_vhaddr *vha;
2081 struct in_ifaddr *carp_ia;
2082
2083 KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
2084 carp_ia = ifatoia(carp_ifa);
2085
2086 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
2087 KKASSERT(vha->vha_ia != NULL);
2088 if (vha->vha_ia == carp_ia)
2089 break;
2090 }
2091 KASSERT(vha != NULL, ("no corresponding vhaddr %p", carp_ifa));
2092
2093 /*
2094 * Remove the vhaddr from the list before deactivating
2095 * the vhaddr, so that the HMAC could be correctly
2096 * updated in carp_deactivate_vhaddr()
2097 */
2098 carp_remove_vhaddr(sc, vha);
2099
2100 carp_deactivate_vhaddr(sc, vha, FALSE);
2101 kfree(vha, M_CARP);
2102 }
2103
2104 static void
2105 carp_config_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
2106 {
2107 struct carp_vhaddr *vha;
2108 struct in_ifaddr *carp_ia;
2109
2110 KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
2111 carp_ia = ifatoia(carp_ifa);
2112
2113 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
2114 KKASSERT(vha->vha_ia != NULL);
2115 if (vha->vha_ia == carp_ia)
2116 break;
2117 }
2118 KASSERT(vha != NULL, ("no corresponding vhaddr %p", carp_ifa));
2119
2120 /* Remove then reinsert, to keep the vhaddr list sorted */
2121 carp_remove_vhaddr(sc, vha);
2122 carp_insert_vhaddr(sc, vha);
2123
2124 if (carp_config_vhaddr(sc, vha, NULL) != 0) {
2125 /* See the comment in carp_add_addr() */
2126 carp_hmac_prepare(sc);
2127 carp_set_state(sc, INIT);
2128 carp_setrun(sc, 0);
2129 }
2130 }
2131
2132 #ifdef notyet
2133
2134 #ifdef INET6
2135 static int
2136 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
2137 {
2138 struct ifnet *ifp;
2139 struct carp_if *cif;
2140 struct in6_ifaddr *ia, *ia_if;
2141 struct ip6_moptions *im6o = &sc->sc_im6o;
2142 struct in6_multi_mship *imm;
2143 struct in6_addr in6;
2144 int own, error;
2145
2146 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
2147 carp_setrun(sc, 0);
2148 return (0);
2149 }
2150
2151 /* we have to do it by hands to check we won't match on us */
2152 ia_if = NULL; own = 0;
2153 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
2154 int i;
2155
2156 for (i = 0; i < 4; i++) {
2157 if ((sin6->sin6_addr.s6_addr32[i] &
2158 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
2159 (ia->ia_addr.sin6_addr.s6_addr32[i] &
2160 ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
2161 break;
2162 }
2163 /* and, yeah, we need a multicast-capable iface too */
2164 if (ia->ia_ifp != &sc->sc_if &&
2165 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
2166 (i == 4)) {
2167 if (!ia_if)
2168 ia_if = ia;
2169 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2170 &ia->ia_addr.sin6_addr))
2171 own++;
2172 }
2173 }
2174
2175 if (!ia_if)
2176 return (EADDRNOTAVAIL);
2177 ia = ia_if;
2178 ifp = ia->ia_ifp;
2179
2180 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
2181 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp))
2182 return (EADDRNOTAVAIL);
2183
2184 if (!sc->sc_naddrs6) {
2185 im6o->im6o_multicast_ifp = ifp;
2186
2187 /* join CARP multicast address */
2188 bzero(&in6, sizeof(in6));
2189 in6.s6_addr16[0] = htons(0xff02);
2190 in6.s6_addr8[15] = 0x12;
2191 if (in6_setscope(&in6, ifp, NULL) != 0)
2192 goto cleanup;
2193 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
2194 goto cleanup;
2195 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
2196
2197 /* join solicited multicast address */
2198 bzero(&in6, sizeof(in6));
2199 in6.s6_addr16[0] = htons(0xff02);
2200 in6.s6_addr32[1] = 0;
2201 in6.s6_addr32[2] = htonl(1);
2202 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3];
2203 in6.s6_addr8[12] = 0xff;
2204 if (in6_setscope(&in6, ifp, NULL) != 0)
2205 goto cleanup;
2206 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
2207 goto cleanup;
2208 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
2209 }
2210
2211 #ifdef foo
2212 if (!ifp->if_carp) {
2213 cif = kmalloc(sizeof(*cif), M_CARP, M_WAITOK | M_ZERO);
2214
2215 if ((error = ifpromisc(ifp, 1))) {
2216 kfree(cif, M_CARP);
2217 goto cleanup;
2218 }
2219
2220 TAILQ_INIT(&cif->vhif_vrs);
2221 ifp->if_carp = cif;
2222 } else {
2223 struct carp_softc *vr;
2224
2225 cif = ifp->if_carp;
2226 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
2227 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
2228 error = EINVAL;
2229 goto cleanup;
2230 }
2231 }
2232 }
2233 #endif
2234 sc->sc_ia6 = ia;
2235 sc->sc_carpdev = ifp;
2236
2237 #ifdef foo
2238 { /* XXX prevent endless loop if already in queue */
2239 struct carp_softc *vr, *after = NULL;
2240 int myself = 0;
2241 cif = ifp->if_carp;
2242
2243 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
2244 if (vr == sc)
2245 myself = 1;
2246 if (vr->sc_vhid < sc->sc_vhid)
2247 after = vr;
2248 }
2249
2250 if (!myself) {
2251 /* We're trying to keep things in order */
2252 if (after == NULL)
2253 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
2254 else
2255 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
2256 }
2257 }
2258 #endif
2259
2260 sc->sc_naddrs6++;
2261 if (own)
2262 sc->sc_advskew = 0;
2263 carp_sc_state(sc);
2264 carp_setrun(sc, 0);
2265
2266 return (0);
2267
2268 cleanup:
2269 /* clean up multicast memberships */
2270 if (!sc->sc_naddrs6) {
2271 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
2272 imm = LIST_FIRST(&im6o->im6o_memberships);
2273 LIST_REMOVE(imm, i6mm_chain);
2274 in6_leavegroup(imm);
2275 }
2276 }
2277 return (error);
2278 }
2279
2280 static int
2281 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
2282 {
2283 int error = 0;
2284
2285 if (!--sc->sc_naddrs6) {
2286 struct carp_if *cif = sc->sc_carpdev->if_carp;
2287 struct ip6_moptions *im6o = &sc->sc_im6o;
2288
2289 callout_stop(&sc->sc_ad_tmo);
2290 sc->sc_vhid = -1;
2291 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
2292 struct in6_multi_mship *imm =
2293 LIST_FIRST(&im6o->im6o_memberships);
2294
2295 LIST_REMOVE(imm, i6mm_chain);
2296 in6_leavegroup(imm);
2297 }
2298 im6o->im6o_multicast_ifp = NULL;
2299 #ifdef foo
2300 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
2301 if (TAILQ_EMPTY(&cif->vhif_vrs)) {
2302 sc->sc_carpdev->if_carp = NULL;
2303 kfree(cif, M_IFADDR);
2304 }
2305 #endif
2306 }
2307 return (error);
2308 }
2309 #endif /* INET6 */
2310
2311 #endif
2312
2313 static int
2314 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr, struct ucred *cr)
2315 {
2316 struct carp_softc *sc = ifp->if_softc;
2317 struct ifreq *ifr = (struct ifreq *)addr;
2318 struct ifdrv *ifd = (struct ifdrv *)addr;
2319 int error = 0;
2320
2321 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2322
2323 switch (cmd) {
2324 case SIOCSIFFLAGS:
2325 if (ifp->if_flags & IFF_UP) {
2326 if ((ifp->if_flags & IFF_RUNNING) == 0)
2327 carp_init(sc);
2328 } else if (ifp->if_flags & IFF_RUNNING) {
2329 carp_ioctl_stop(sc);
2330 }
2331 break;
2332
2333 case SIOCSIFCAP:
2334 carp_ioctl_ifcap(sc, ifr->ifr_reqcap);
2335 break;
2336
2337 case SIOCSVH:
2338 error = carp_ioctl_setvh(sc, ifr->ifr_data, cr);
2339 break;
2340
2341 case SIOCGVH:
2342 error = carp_ioctl_getvh(sc, ifr->ifr_data, cr);
2343 break;
2344
2345 case SIOCGDRVSPEC:
2346 switch (ifd->ifd_cmd) {
2347 case CARPGDEVNAME:
2348 error = carp_ioctl_getdevname(sc, ifd);
2349 break;
2350
2351 case CARPGVHADDR:
2352 error = carp_ioctl_getvhaddr(sc, ifd);
2353 break;
2354
2355 default:
2356 error = EINVAL;
2357 break;
2358 }
2359 break;
2360
2361 default:
2362 error = ether_ioctl(ifp, cmd, addr);
2363 break;
2364 }
2365
2366 return error;
2367 }
2368
2369 static void
2370 carp_ioctl_stop_dispatch(netmsg_t msg)
2371 {
2372 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2373 struct carp_softc *sc = cmsg->nc_softc;
2374
2375 carp_stop(sc, FALSE);
2376 lwkt_replymsg(&cmsg->base.lmsg, 0);
2377 }
2378
2379 static void
2380 carp_ioctl_stop(struct carp_softc *sc)
2381 {
2382 struct ifnet *ifp = &sc->arpcom.ac_if;
2383 struct netmsg_carp cmsg;
2384
2385 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2386
2387 ifnet_deserialize_all(ifp);
2388
2389 bzero(&cmsg, sizeof(cmsg));
2390 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2391 carp_ioctl_stop_dispatch);
2392 cmsg.nc_softc = sc;
2393
2394 lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2395
2396 ifnet_serialize_all(ifp);
2397 }
2398
2399 static void
2400 carp_ioctl_setvh_dispatch(netmsg_t msg)
2401 {
2402 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2403 struct carp_softc *sc = cmsg->nc_softc;
2404 struct ifnet *ifp = &sc->arpcom.ac_if;
2405 const struct carpreq *carpr = cmsg->nc_data;
2406 int error;
2407
2408 error = 1;
2409 if ((ifp->if_flags & IFF_RUNNING) &&
2410 sc->sc_state != INIT && carpr->carpr_state != sc->sc_state) {
2411 switch (carpr->carpr_state) {
2412 case BACKUP:
2413 callout_stop(&sc->sc_ad_tmo);
2414 carp_set_state(sc, BACKUP);
2415 carp_setrun(sc, 0);
2416 carp_setroute(sc, RTM_DELETE);
2417 break;
2418
2419 case MASTER:
2420 carp_master_down(sc);
2421 break;
2422
2423 default:
2424 break;
2425 }
2426 }
2427 if (carpr->carpr_vhid > 0) {
2428 if (carpr->carpr_vhid > 255) {
2429 error = EINVAL;
2430 goto back;
2431 }
2432 if (sc->sc_carpdev) {
2433 struct carp_if *cif = sc->sc_carpdev->if_carp;
2434 struct carp_softc_container *scc;
2435
2436 TAILQ_FOREACH(scc, cif, scc_link) {
2437 struct carp_softc *vr = scc->scc_softc;
2438
2439 if (vr != sc &&
2440 vr->sc_vhid == carpr->carpr_vhid) {
2441 error = EEXIST;
2442 goto back;
2443 }
2444 }
2445 }
2446 sc->sc_vhid = carpr->carpr_vhid;
2447
2448 IF_LLADDR(ifp)[5] = sc->sc_vhid;
2449 bcopy(IF_LLADDR(ifp), sc->arpcom.ac_enaddr,
2450 ETHER_ADDR_LEN);
2451
2452 error--;
2453 }
2454 if (carpr->carpr_advbase > 0 || carpr->carpr_advskew > 0) {
2455 if (carpr->carpr_advskew >= 255) {
2456 error = EINVAL;
2457 goto back;
2458 }
2459 if (carpr->carpr_advbase > 255) {
2460 error = EINVAL;
2461 goto back;
2462 }
2463 sc->sc_advbase = carpr->carpr_advbase;
2464 sc->sc_advskew = carpr->carpr_advskew;
2465 error--;
2466 }
2467 bcopy(carpr->carpr_key, sc->sc_key, sizeof(sc->sc_key));
2468 if (error > 0) {
2469 error = EINVAL;
2470 } else {
2471 error = 0;
2472 carp_setrun(sc, 0);
2473 }
2474 back:
2475 carp_hmac_prepare(sc);
2476
2477 lwkt_replymsg(&cmsg->base.lmsg, error);
2478 }
2479
2480 static int
2481 carp_ioctl_setvh(struct carp_softc *sc, void *udata, struct ucred *cr)
2482 {
2483 struct ifnet *ifp = &sc->arpcom.ac_if;
2484 struct netmsg_carp cmsg;
2485 struct carpreq carpr;
2486 int error;
2487
2488 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2489 ifnet_deserialize_all(ifp);
2490
2491 error = priv_check_cred(cr, PRIV_ROOT, NULL_CRED_OKAY);
2492 if (error)
2493 goto back;
2494
2495 error = copyin(udata, &carpr, sizeof(carpr));
2496 if (error)
2497 goto back;
2498
2499 bzero(&cmsg, sizeof(cmsg));
2500 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2501 carp_ioctl_setvh_dispatch);
2502 cmsg.nc_softc = sc;
2503 cmsg.nc_data = &carpr;
2504
2505 error = lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2506
2507 back:
2508 ifnet_serialize_all(ifp);
2509 return error;
2510 }
2511
2512 static void
2513 carp_ioctl_ifcap_dispatch(netmsg_t msg)
2514 {
2515 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2516 struct carp_softc *sc = cmsg->nc_softc;
2517 struct ifnet *ifp = &sc->arpcom.ac_if;
2518 int reqcap = *((const int *)(cmsg->nc_data));
2519 int mask;
2520
2521 mask = reqcap ^ ifp->if_capenable;
2522 if (mask & IFCAP_TXCSUM) {
2523 ifp->if_capenable ^= IFCAP_TXCSUM;
2524 if ((ifp->if_capenable & IFCAP_TXCSUM) &&
2525 sc->sc_carpdev != NULL) {
2526 ifp->if_hwassist |=
2527 (sc->sc_carpdev->if_hwassist &
2528 (CSUM_IP | CSUM_UDP | CSUM_TCP));
2529 } else {
2530 ifp->if_hwassist &= ~(CSUM_IP | CSUM_UDP | CSUM_TCP);
2531 }
2532 }
2533 if (mask & IFCAP_TSO) {
2534 ifp->if_capenable ^= IFCAP_TSO;
2535 if ((ifp->if_capenable & IFCAP_TSO) &&
2536 sc->sc_carpdev != NULL) {
2537 ifp->if_hwassist |=
2538 (sc->sc_carpdev->if_hwassist & CSUM_TSO);
2539 } else {
2540 ifp->if_hwassist &= ~CSUM_TSO;
2541 }
2542 }
2543
2544 lwkt_replymsg(&cmsg->base.lmsg, 0);
2545 }
2546
2547 static void
2548 carp_ioctl_ifcap(struct carp_softc *sc, int reqcap)
2549 {
2550 struct ifnet *ifp = &sc->arpcom.ac_if;
2551 struct netmsg_carp cmsg;
2552
2553 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2554 ifnet_deserialize_all(ifp);
2555
2556 bzero(&cmsg, sizeof(cmsg));
2557 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2558 carp_ioctl_ifcap_dispatch);
2559 cmsg.nc_softc = sc;
2560 cmsg.nc_data = &reqcap;
2561
2562 lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2563
2564 ifnet_serialize_all(ifp);
2565 }
2566
2567 static void
2568 carp_ioctl_getvh_dispatch(netmsg_t msg)
2569 {
2570 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2571 struct carp_softc *sc = cmsg->nc_softc;
2572 struct carpreq *carpr = cmsg->nc_data;
2573
2574 carpr->carpr_state = sc->sc_state;
2575 carpr->carpr_vhid = sc->sc_vhid;
2576 carpr->carpr_advbase = sc->sc_advbase;
2577 carpr->carpr_advskew = sc->sc_advskew;
2578 bcopy(sc->sc_key, carpr->carpr_key, sizeof(carpr->carpr_key));
2579
2580 lwkt_replymsg(&cmsg->base.lmsg, 0);
2581 }
2582
2583 static int
2584 carp_ioctl_getvh(struct carp_softc *sc, void *udata, struct ucred *cr)
2585 {
2586 struct ifnet *ifp = &sc->arpcom.ac_if;
2587 struct netmsg_carp cmsg;
2588 struct carpreq carpr;
2589 int error;
2590
2591 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2592 ifnet_deserialize_all(ifp);
2593
2594 bzero(&cmsg, sizeof(cmsg));
2595 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2596 carp_ioctl_getvh_dispatch);
2597 cmsg.nc_softc = sc;
2598 cmsg.nc_data = &carpr;
2599
2600 lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2601
2602 error = priv_check_cred(cr, PRIV_ROOT, NULL_CRED_OKAY);
2603 if (error)
2604 bzero(carpr.carpr_key, sizeof(carpr.carpr_key));
2605
2606 error = copyout(&carpr, udata, sizeof(carpr));
2607
2608 ifnet_serialize_all(ifp);
2609 return error;
2610 }
2611
2612 static void
2613 carp_ioctl_getdevname_dispatch(netmsg_t msg)
2614 {
2615 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2616 struct carp_softc *sc = cmsg->nc_softc;
2617 char *devname = cmsg->nc_data;
2618
2619 bzero(devname, IFNAMSIZ);
2620 if (sc->sc_carpdev != NULL)
2621 strlcpy(devname, sc->sc_carpdev->if_xname, IFNAMSIZ);
2622
2623 lwkt_replymsg(&cmsg->base.lmsg, 0);
2624 }
2625
2626 static int
2627 carp_ioctl_getdevname(struct carp_softc *sc, struct ifdrv *ifd)
2628 {
2629 struct ifnet *ifp = &sc->arpcom.ac_if;
2630 struct netmsg_carp cmsg;
2631 char devname[IFNAMSIZ];
2632 int error;
2633
2634 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2635
2636 if (ifd->ifd_len != sizeof(devname))
2637 return EINVAL;
2638
2639 ifnet_deserialize_all(ifp);
2640
2641 bzero(&cmsg, sizeof(cmsg));
2642 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2643 carp_ioctl_getdevname_dispatch);
2644 cmsg.nc_softc = sc;
2645 cmsg.nc_data = devname;
2646
2647 lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2648
2649 error = copyout(devname, ifd->ifd_data, sizeof(devname));
2650
2651 ifnet_serialize_all(ifp);
2652 return error;
2653 }
2654
2655 static void
2656 carp_init_dispatch(netmsg_t msg)
2657 {
2658 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2659 struct carp_softc *sc = cmsg->nc_softc;
2660
2661 sc->sc_if.if_flags |= IFF_RUNNING;
2662 carp_hmac_prepare(sc);
2663 carp_set_state(sc, INIT);
2664 carp_setrun(sc, 0);
2665
2666 lwkt_replymsg(&cmsg->base.lmsg, 0);
2667 }
2668
2669 static void
2670 carp_init(void *xsc)
2671 {
2672 struct carp_softc *sc = xsc;
2673 struct ifnet *ifp = &sc->arpcom.ac_if;
2674 struct netmsg_carp cmsg;
2675
2676 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2677
2678 ifnet_deserialize_all(ifp);
2679
2680 bzero(&cmsg, sizeof(cmsg));
2681 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2682 carp_init_dispatch);
2683 cmsg.nc_softc = sc;
2684
2685 lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2686
2687 ifnet_serialize_all(ifp);
2688 }
2689
2690 static int
2691 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
2692 struct rtentry *rt)
2693 {
2694 struct carp_softc *sc = ifp->if_softc;
2695 struct ifnet *carpdev;
2696 int error = 0;
2697
2698 carpdev = sc->sc_carpdev;
2699 if (carpdev != NULL) {
2700 if (m->m_flags & M_MCAST)
2701 IFNET_STAT_INC(ifp, omcasts, 1);
2702 IFNET_STAT_INC(ifp, obytes, m->m_pkthdr.len + ETHER_HDR_LEN);
2703 IFNET_STAT_INC(ifp, opackets, 1);
2704
2705 /*
2706 * NOTE:
2707 * CARP's ifp is passed to backing device's
2708 * if_output method.
2709 */
2710 carpdev->if_output(ifp, m, dst, rt);
2711 } else {
2712 IFNET_STAT_INC(ifp, oerrors, 1);
2713 m_freem(m);
2714 error = ENETUNREACH;
2715 }
2716 return error;
2717 }
2718
2719 /*
2720 * Start output on carp interface. This function should never be called.
2721 */
2722 static void
2723 carp_start(struct ifnet *ifp, struct ifaltq_subque *ifsq __unused)
2724 {
2725 panic("%s: start called", ifp->if_xname);
2726 }
2727
2728 static void
2729 carp_set_state(struct carp_softc *sc, int state)
2730 {
2731 struct ifnet *cifp = &sc->sc_if;
2732
2733 if (sc->sc_state == state)
2734 return;
2735 sc->sc_state = state;
2736
2737 switch (sc->sc_state) {
2738 case BACKUP:
2739 cifp->if_link_state = LINK_STATE_DOWN;
2740 break;
2741
2742 case MASTER:
2743 cifp->if_link_state = LINK_STATE_UP;
2744 break;
2745
2746 default:
2747 cifp->if_link_state = LINK_STATE_UNKNOWN;
2748 break;
2749 }
2750 rt_ifmsg(cifp);
2751 }
2752
2753 void
2754 carp_group_demote_adj(struct ifnet *ifp, int adj)
2755 {
2756 struct ifg_list *ifgl;
2757 int *dm;
2758
2759 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) {
2760 if (!strcmp(ifgl->ifgl_group->ifg_group, IFG_ALL))
2761 continue;
2762 dm = &ifgl->ifgl_group->ifg_carp_demoted;
2763
2764 if (*dm + adj >= 0)
2765 *dm += adj;
2766 else
2767 *dm = 0;
2768
2769 if (adj > 0 && *dm == 1)
2770 carp_send_ad_all();
2771 CARP_LOG("%s demoted group %s to %d", ifp->if_xname,
2772 ifgl->ifgl_group->ifg_group, *dm);
2773 }
2774 }
2775
2776 #ifdef foo
2777 void
2778 carp_carpdev_state(void *v)
2779 {
2780 struct carp_if *cif = v;
2781 struct carp_softc *sc;
2782
2783 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
2784 carp_sc_state(sc);
2785 }
2786
2787 static void
2788 carp_sc_state(struct carp_softc *sc)
2789 {
2790 if (!(sc->sc_carpdev->if_flags & IFF_UP)) {
2791 callout_stop(&sc->sc_ad_tmo);
2792 callout_stop(&sc->sc_md_tmo);
2793 callout_stop(&sc->sc_md6_tmo);
2794 carp_set_state(sc, INIT);
2795 carp_setrun(sc, 0);
2796 if (!sc->sc_suppress) {
2797 carp_suppress_preempt++;
2798 if (carp_suppress_preempt == 1)
2799 carp_send_ad_all();
2800 }
2801 sc->sc_suppress = 1;
2802 } else {
2803 carp_set_state(sc, INIT);
2804 carp_setrun(sc, 0);
2805 if (sc->sc_suppress)
2806 carp_suppress_preempt--;
2807 sc->sc_suppress = 0;
2808 }
2809 }
2810 #endif
2811
2812 static void
2813 carp_stop(struct carp_softc *sc, boolean_t detach)
2814 {
2815 sc->sc_if.if_flags &= ~IFF_RUNNING;
2816
2817 callout_stop(&sc->sc_ad_tmo);
2818 callout_stop(&sc->sc_md_tmo);
2819 callout_stop(&sc->sc_md6_tmo);
2820
2821 if (!detach && sc->sc_state == MASTER)
2822 carp_send_ad(sc);
2823
2824 if (sc->sc_suppress)
2825 carp_suppress_preempt--;
2826 sc->sc_suppress = 0;
2827
2828 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
2829 carp_suppress_preempt--;
2830 sc->sc_sendad_errors = 0;
2831 sc->sc_sendad_success = 0;
2832
2833 carp_set_state(sc, INIT);
2834 carp_setrun(sc, 0);
2835 }
2836
2837 static void
2838 carp_suspend(struct carp_softc *sc, boolean_t detach)
2839 {
2840 struct ifnet *cifp = &sc->sc_if;
2841
2842 carp_stop(sc, detach);
2843
2844 /* Retain the running state, if we are not dead yet */
2845 if (!sc->sc_dead && (cifp->if_flags & IFF_UP))
2846 cifp->if_flags |= IFF_RUNNING;
2847 }
2848
2849 static int
2850 carp_activate_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
2851 struct ifnet *ifp, struct in_ifaddr *ia_if, int own)
2852 {
2853 struct ip_moptions *imo = &sc->sc_imo;
2854 struct carp_if *ocif = ifp->if_carp;
2855 int error;
2856
2857 KKASSERT(vha->vha_ia != NULL);
2858
2859 KASSERT(ia_if != NULL, ("NULL backing address"));
2860 KASSERT(vha->vha_iaback == NULL, ("%p is already activated", vha));
2861 KASSERT((vha->vha_flags & CARP_VHAF_OWNER) == 0,
2862 ("inactive vhaddr %p is the address owner", vha));
2863
2864 KASSERT(sc->sc_carpdev == NULL || sc->sc_carpdev == ifp,
2865 ("%s is already on %s", sc->sc_if.if_xname,
2866 sc->sc_carpdev->if_xname));
2867
2868 if (ocif == NULL) {
2869 KASSERT(sc->sc_carpdev == NULL,
2870 ("%s is already on %s", sc->sc_if.if_xname,
2871 sc->sc_carpdev->if_xname));
2872
2873 error = ifpromisc(ifp, 1);
2874 if (error)
2875 return error;
2876 } else {
2877 struct carp_softc_container *scc;
2878
2879 TAILQ_FOREACH(scc, ocif, scc_link) {
2880 struct carp_softc *vr = scc->scc_softc;
2881
2882 if (vr != sc && vr->sc_vhid == sc->sc_vhid)
2883 return EINVAL;
2884 }
2885 }
2886
2887 ifp->if_carp = carp_if_insert(ocif, sc);
2888 KASSERT(ifp->if_carp != NULL, ("%s carp_if_insert failed", __func__));
2889
2890 sc->sc_ia = ia_if;
2891 sc->sc_carpdev = ifp;
2892 sc->arpcom.ac_if.if_hwassist = 0;
2893 if (sc->arpcom.ac_if.if_capenable & IFCAP_TXCSUM) {
2894 sc->arpcom.ac_if.if_hwassist |=
2895 (ifp->if_hwassist & (CSUM_IP | CSUM_UDP | CSUM_TCP));
2896 }
2897 if (sc->arpcom.ac_if.if_capenable & IFCAP_TSO)
2898 sc->arpcom.ac_if.if_hwassist |= (ifp->if_hwassist & CSUM_TSO);
2899
2900 /*
2901 * Make sure that all protocol threads see the sc_carpdev and
2902 * if_carp changes
2903 */
2904 netmsg_service_sync();
2905
2906 if (ocif != NULL && ifp->if_carp != ocif) {
2907 /*
2908 * The old carp list could be safely free now,
2909 * since no one can access it.
2910 */
2911 carp_if_free(ocif);
2912 }
2913
2914 vha->vha_iaback = ia_if;
2915 sc->sc_naddrs++;
2916
2917 if (own) {
2918 vha->vha_flags |= CARP_VHAF_OWNER;
2919
2920 /* XXX save user configured advskew? */
2921 sc->sc_advskew = 0;
2922 }
2923
2924 carp_addroute_vhaddr(sc, vha);
2925
2926 /*
2927 * Join the multicast group only after the backing interface
2928 * has been hooked with the CARP interface.
2929 */
2930 KASSERT(imo->imo_multicast_ifp == NULL ||
2931 imo->imo_multicast_ifp == &sc->sc_if,
2932 ("%s didn't leave mcast group on %s",
2933 sc->sc_if.if_xname, imo->imo_multicast_ifp->if_xname));
2934
2935 if (imo->imo_num_memberships == 0) {
2936 struct in_addr addr;
2937
2938 addr.s_addr = htonl(INADDR_CARP_GROUP);
2939 imo->imo_membership[0] = in_addmulti(&addr, &sc->sc_if);
2940 if (imo->imo_membership[0] == NULL) {
2941 carp_deactivate_vhaddr(sc, vha, FALSE);
2942 return ENOBUFS;
2943 }
2944
2945 imo->imo_num_memberships++;
2946 imo->imo_multicast_ifp = &sc->sc_if;
2947 imo->imo_multicast_ttl = CARP_DFLTTL;
2948 imo->imo_multicast_loop = 0;
2949 }
2950
2951 carp_hmac_prepare(sc);
2952 carp_set_state(sc, INIT);
2953 carp_setrun(sc, 0);
2954 return 0;
2955 }
2956
2957 static void
2958 carp_deactivate_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
2959 boolean_t del_iaback)
2960 {
2961 KKASSERT(vha->vha_ia != NULL);
2962
2963 carp_hmac_prepare(sc);
2964
2965 if (vha->vha_iaback == NULL) {
2966 KASSERT((vha->vha_flags & CARP_VHAF_OWNER) == 0,
2967 ("inactive vhaddr %p is the address owner", vha));
2968 return;
2969 }
2970
2971 vha->vha_flags &= ~CARP_VHAF_OWNER;
2972 carp_delroute_vhaddr(sc, vha, del_iaback);
2973
2974 KKASSERT(sc->sc_naddrs > 0);
2975 vha->vha_iaback = NULL;
2976 sc->sc_naddrs--;
2977 if (!sc->sc_naddrs) {
2978 if (sc->sc_naddrs6) {
2979 carp_multicast_cleanup(sc);
2980 sc->sc_ia = NULL;
2981 } else {
2982 carp_detach(sc, FALSE, del_iaback);
2983 }
2984 }
2985 }
2986
2987 static void
2988 carp_link_addrs(struct carp_softc *sc, struct ifnet *ifp, struct ifaddr *ifa_if)
2989 {
2990 struct carp_vhaddr *vha;
2991 struct in_ifaddr *ia_if;
2992
2993 KKASSERT(ifa_if->ifa_addr->sa_family == AF_INET);
2994 ia_if = ifatoia(ifa_if);
2995
2996 /*
2997 * Test each inactive vhaddr against the newly added address.
2998 * If the newly added address could be the backing address,
2999 * then activate the matching vhaddr.
3000 */
3001 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
3002 const struct in_ifaddr *ia;
3003 int own;
3004
3005 if (vha->vha_iaback != NULL)
3006 continue;
3007
3008 ia = vha->vha_ia;
3009 if (ia->ia_subnetmask != ia_if->ia_subnetmask ||
3010 ia->ia_subnet != ia_if->ia_subnet)
3011 continue;
3012
3013 own = 0;
3014 if (ia->ia_addr.sin_addr.s_addr ==
3015 ia_if->ia_addr.sin_addr.s_addr)
3016 own = 1;
3017
3018 carp_activate_vhaddr(sc, vha, ifp, ia_if, own);
3019 }
3020 }
3021
3022 static void
3023 carp_unlink_addrs(struct carp_softc *sc, struct ifnet *ifp,
3024 struct ifaddr *ifa_if)
3025 {
3026 struct carp_vhaddr *vha;
3027 struct in_ifaddr *ia_if;
3028
3029 KKASSERT(ifa_if->ifa_addr->sa_family == AF_INET);
3030 ia_if = ifatoia(ifa_if);
3031
3032 /*
3033 * Ad src address is deleted; set it to NULL.
3034 * Following loop will try pick up a new ad src address
3035 * if one of the vhaddr could retain its backing address.
3036 */
3037 if (sc->sc_ia == ia_if)
3038 sc->sc_ia = NULL;
3039
3040 /*
3041 * Test each active vhaddr against the deleted address.
3042 * If the deleted address is vhaddr address's backing
3043 * address, then deactivate the vhaddr.
3044 */
3045 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
3046 if (vha->vha_iaback == NULL)
3047 continue;
3048
3049 if (vha->vha_iaback == ia_if)
3050 carp_deactivate_vhaddr(sc, vha, TRUE);
3051 else if (sc->sc_ia == NULL)
3052 sc->sc_ia = vha->vha_iaback;
3053 }
3054 }
3055
3056 static void
3057 carp_update_addrs(struct carp_softc *sc, struct ifaddr *ifa_del)
3058 {
3059 struct carp_vhaddr *vha;
3060
3061 KKASSERT(sc->sc_carpdev == NULL);
3062
3063 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
3064 carp_config_vhaddr(sc, vha, ifatoia(ifa_del));
3065 }
3066
3067 static void
3068 carp_ifaddr(void *arg __unused, struct ifnet *ifp,
3069 enum ifaddr_event event, struct ifaddr *ifa)
3070 {
3071 struct carp_softc *sc;
3072
3073 if (ifa->ifa_addr->sa_family != AF_INET)
3074 return;
3075
3076 ASSERT_IN_NETISR(0);
3077
3078 if (ifp->if_type == IFT_CARP) {
3079 /*
3080 * Address is changed on carp(4) interface
3081 */
3082 switch (event) {
3083 case IFADDR_EVENT_ADD:
3084 carp_add_addr(ifp->if_softc, ifa);
3085 break;
3086
3087 case IFADDR_EVENT_CHANGE:
3088 carp_config_addr(ifp->if_softc, ifa);
3089 break;
3090
3091 case IFADDR_EVENT_DELETE:
3092 carp_del_addr(ifp->if_softc, ifa);
3093 break;
3094 }
3095 return;
3096 }
3097
3098 /*
3099 * Address is changed on non-carp(4) interface
3100 */
3101 if ((ifp->if_flags & IFF_MULTICAST) == 0)
3102 return;
3103
3104 LIST_FOREACH(sc, &carpif_list, sc_next) {
3105 if (sc->sc_carpdev != NULL && sc->sc_carpdev != ifp) {
3106 /* Not the parent iface; skip */
3107 continue;
3108 }
3109
3110 switch (event) {
3111 case IFADDR_EVENT_ADD:
3112 carp_link_addrs(sc, ifp, ifa);
3113 break;
3114
3115 case IFADDR_EVENT_DELETE:
3116 if (sc->sc_carpdev != NULL) {
3117 carp_unlink_addrs(sc, ifp, ifa);
3118 if (sc->sc_carpdev == NULL) {
3119 /*
3120 * We no longer have the parent
3121 * interface, however, certain
3122 * virtual addresses, which are
3123 * not used because they can't
3124 * match the previous parent
3125 * interface's addresses, may now
3126 * match different interface's
3127 * addresses.
3128 */
3129 carp_update_addrs(sc, ifa);
3130 }
3131 } else {
3132 /*
3133 * The carp(4) interface didn't have a
3134 * parent iface, so it is not possible
3135 * that it will contain any address to
3136 * be unlinked.
3137 */
3138 }
3139 break;
3140
3141 case IFADDR_EVENT_CHANGE:
3142 if (sc->sc_carpdev == NULL) {
3143 /*
3144 * The carp(4) interface didn't have a
3145 * parent iface, so it is not possible
3146 * that it will contain any address to
3147 * be updated.
3148 */
3149 carp_link_addrs(sc, ifp, ifa);
3150 } else {
3151 /*
3152 * First try breaking tie with the old
3153 * address. Then see whether we could
3154 * link certain vhaddr to the new address.
3155 * If that fails, i.e. carpdev is NULL,
3156 * we try a global update.
3157 *
3158 * NOTE: The above order is critical.
3159 */
3160 carp_unlink_addrs(sc, ifp, ifa);
3161 carp_link_addrs(sc, ifp, ifa);
3162 if (sc->sc_carpdev == NULL) {
3163 /*
3164 * See the comment in the above
3165 * IFADDR_EVENT_DELETE block.
3166 */
3167 carp_update_addrs(sc, NULL);
3168 }
3169 }
3170 break;
3171 }
3172 }
3173 }
3174
3175 void
3176 carp_proto_ctlinput(netmsg_t msg)
3177 {
3178 int cmd = msg->ctlinput.nm_cmd;
3179 struct sockaddr *sa = msg->ctlinput.nm_arg;
3180 struct in_ifaddr_container *iac;
3181
3182 /* We only process PRC_IFDOWN and PRC_IFUP commands */
3183 if (cmd != PRC_IFDOWN && cmd != PRC_IFUP)
3184 goto done;
3185
3186 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
3187 struct in_ifaddr *ia = iac->ia;
3188 struct ifnet *ifp = ia->ia_ifp;
3189
3190 if (ifp->if_type == IFT_CARP)
3191 continue;
3192
3193 if (ia->ia_ifa.ifa_addr == sa) {
3194 if (cmd == PRC_IFDOWN) {
3195 carp_ifaddr(NULL, ifp, IFADDR_EVENT_DELETE,
3196 &ia->ia_ifa);
3197 } else if (cmd == PRC_IFUP) {
3198 carp_ifaddr(NULL, ifp, IFADDR_EVENT_ADD,
3199 &ia->ia_ifa);
3200 }
3201 break;
3202 }
3203 }
3204 done:
3205 lwkt_replymsg(&msg->lmsg, 0);
3206 }
3207
3208 struct ifnet *
3209 carp_parent(struct ifnet *cifp)
3210 {
3211 struct carp_softc *sc;
3212
3213 KKASSERT(cifp->if_type == IFT_CARP);
3214 sc = cifp->if_softc;
3215
3216 return sc->sc_carpdev;
3217 }
3218
3219 #define rtinitflags(x) \
3220 (((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) \
3221 ? RTF_HOST : 0)
3222
3223 static int
3224 carp_addroute_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha)
3225 {
3226 struct in_ifaddr *ia, *iaback;
3227
3228 if (sc->sc_state != MASTER)
3229 return 0;
3230
3231 ia = vha->vha_ia;
3232 KKASSERT(ia != NULL);
3233
3234 iaback = vha->vha_iaback;
3235 KKASSERT(iaback != NULL);
3236
3237 return rtchange(&iaback->ia_ifa, &ia->ia_ifa);
3238 }
3239
3240 static void
3241 carp_delroute_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
3242 boolean_t del_iaback)
3243 {
3244 struct in_ifaddr *ia, *iaback;
3245
3246 ia = vha->vha_ia;
3247 KKASSERT(ia != NULL);
3248
3249 iaback = vha->vha_iaback;
3250 KKASSERT(iaback != NULL);
3251
3252 if (!del_iaback && (iaback->ia_ifp->if_flags & IFF_UP)) {
3253 rtchange(&ia->ia_ifa, &iaback->ia_ifa);
3254 return;
3255 }
3256
3257 rtinit(&ia->ia_ifa, RTM_DELETE, rtinitflags(ia));
3258 in_ifadown_force(&ia->ia_ifa, 1);
3259 ia->ia_flags &= ~IFA_ROUTE;
3260 }
3261
3262 static int
3263 carp_modevent(module_t mod, int type, void *data)
3264 {
3265 switch (type) {
3266 case MOD_LOAD:
3267 LIST_INIT(&carpif_list);
3268 carp_ifdetach_event =
3269 EVENTHANDLER_REGISTER(ifnet_detach_event, carp_ifdetach, NULL,
3270 EVENTHANDLER_PRI_ANY);
3271 carp_ifaddr_event =
3272 EVENTHANDLER_REGISTER(ifaddr_event, carp_ifaddr, NULL,
3273 EVENTHANDLER_PRI_FIRST);
3274 if_clone_attach(&carp_cloner);
3275 break;
3276
3277 case MOD_UNLOAD:
3278 EVENTHANDLER_DEREGISTER(ifnet_detach_event,
3279 carp_ifdetach_event);
3280 EVENTHANDLER_DEREGISTER(ifaddr_event,
3281 carp_ifaddr_event);
3282 if_clone_detach(&carp_cloner);
3283 break;
3284
3285 default:
3286 return (EINVAL);
3287 }
3288 return (0);
3289 }
3290
3291 static moduledata_t carp_mod = {
3292 "carp",
3293 carp_modevent,
3294 0
3295 };
3296 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
DragonFly BSD