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nrelease - fix/improve livecd
[dragonfly.git] / sys / netinet / ip_carp.c
blob8ab68bad882cef523de66de98c4701e3ba8d1208
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/caps.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, 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,
619 caddr_t params __unused, caddr_t data __unused)
620 {
621 struct carp_softc *sc;
622 struct ifnet *ifp;
623
624 sc = kmalloc(sizeof(*sc), M_CARP, M_WAITOK | M_ZERO);
625 ifp = &sc->sc_if;
626
627 sc->sc_suppress = 0;
628 sc->sc_advbase = CARP_DFLTINTV;
629 sc->sc_vhid = -1; /* required setting */
630 sc->sc_advskew = 0;
631 sc->sc_init_counter = 1;
632 sc->sc_naddrs = 0;
633 sc->sc_naddrs6 = 0;
634
635 TAILQ_INIT(&sc->sc_vha_list);
636
637 #ifdef INET6
638 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
639 #endif
640
641 callout_init_mp(&sc->sc_ad_tmo);
642 netmsg_init(&sc->sc_ad_msg.base, NULL, &netisr_adone_rport,
643 MSGF_DROPABLE | MSGF_PRIORITY, carp_send_ad_timeout_dispatch);
644 sc->sc_ad_msg.nc_softc = sc;
645
646 callout_init_mp(&sc->sc_md_tmo);
647 callout_init_mp(&sc->sc_md6_tmo);
648 netmsg_init(&sc->sc_md_msg.base, NULL, &netisr_adone_rport,
649 MSGF_DROPABLE | MSGF_PRIORITY, carp_master_down_timeout_dispatch);
650 sc->sc_md_msg.nc_softc = sc;
651
652 if_initname(ifp, CARP_IFNAME, unit);
653 ifp->if_softc = sc;
654 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
655 ifp->if_init = carp_init;
656 ifp->if_ioctl = carp_ioctl;
657 ifp->if_start = carp_start;
658
659 ifp->if_capabilities = IFCAP_TXCSUM | IFCAP_TSO;
660 ifp->if_capenable = ifp->if_capabilities;
661 /*
662 * Leave if_hwassist as it is; if_hwassist will be
663 * setup when this carp interface has parent.
664 */
665
666 ifq_set_maxlen(&ifp->if_snd, ifqmaxlen);
667 ifq_set_ready(&ifp->if_snd);
668
669 ether_ifattach(ifp, carp_etheraddr, NULL);
670
671 ifp->if_type = IFT_CARP;
672 ifp->if_output = carp_output;
673
674 lwkt_gettoken(&carp_listtok);
675 LIST_INSERT_HEAD(&carpif_list, sc, sc_next);
676 lwkt_reltoken(&carp_listtok);
677
678 return (0);
679 }
680
681 static void
682 carp_clone_destroy_dispatch(netmsg_t msg)
683 {
684 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
685 struct carp_softc *sc = cmsg->nc_softc;
686
687 sc->sc_dead = TRUE;
688 carp_detach(sc, TRUE, FALSE);
689
690 callout_cancel(&sc->sc_ad_tmo);
691 callout_cancel(&sc->sc_md_tmo);
692 callout_cancel(&sc->sc_md6_tmo);
693
694 crit_enter();
695 lwkt_dropmsg(&sc->sc_ad_msg.base.lmsg);
696 lwkt_dropmsg(&sc->sc_md_msg.base.lmsg);
697 crit_exit();
698
699 lwkt_replymsg(&cmsg->base.lmsg, 0);
700 }
701
702 static int
703 carp_clone_destroy(struct ifnet *ifp)
704 {
705 struct carp_softc *sc = ifp->if_softc;
706 struct netmsg_carp cmsg;
707
708 bzero(&cmsg, sizeof(cmsg));
709 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
710 carp_clone_destroy_dispatch);
711 cmsg.nc_softc = sc;
712
713 lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
714
715 lwkt_gettoken(&carp_listtok);
716 LIST_REMOVE(sc, sc_next);
717 lwkt_reltoken(&carp_listtok);
718
719 bpfdetach(ifp);
720 if_detach(ifp);
721
722 KASSERT(sc->sc_naddrs == 0, ("certain inet address is still active"));
723 kfree(sc, M_CARP);
724
725 return 0;
726 }
727
728 static struct carp_if *
729 carp_if_remove(struct carp_if *ocif, struct carp_softc *sc)
730 {
731 struct carp_softc_container *oscc, *scc;
732 struct carp_if *cif;
733 int count = 0;
734 #ifdef INVARIANTS
735 int found = 0;
736 #endif
737
738 TAILQ_FOREACH(oscc, ocif, scc_link) {
739 ++count;
740 #ifdef INVARIANTS
741 if (oscc->scc_softc == sc)
742 found = 1;
743 #endif
744 }
745 KASSERT(found, ("%s carp_softc is not on carp_if", __func__));
746
747 if (count == 1) {
748 /* Last one is going to be unlinked */
749 return NULL;
750 }
751
752 cif = kmalloc(sizeof(*cif), M_CARP, M_WAITOK | M_ZERO);
753 TAILQ_INIT(cif);
754
755 TAILQ_FOREACH(oscc, ocif, scc_link) {
756 if (oscc->scc_softc == sc)
757 continue;
758
759 scc = kmalloc(sizeof(*scc), M_CARP, M_WAITOK | M_ZERO);
760 scc->scc_softc = oscc->scc_softc;
761 TAILQ_INSERT_TAIL(cif, scc, scc_link);
762 }
763
764 return cif;
765 }
766
767 static struct carp_if *
768 carp_if_insert(struct carp_if *ocif, struct carp_softc *sc)
769 {
770 struct carp_softc_container *oscc;
771 int onlist;
772
773 onlist = 0;
774 if (ocif != NULL) {
775 TAILQ_FOREACH(oscc, ocif, scc_link) {
776 if (oscc->scc_softc == sc)
777 onlist = 1;
778 }
779 }
780
781 #ifdef INVARIANTS
782 if (sc->sc_carpdev != NULL) {
783 KASSERT(onlist, ("%s is not on %s carp list",
784 sc->sc_if.if_xname, sc->sc_carpdev->if_xname));
785 } else {
786 KASSERT(!onlist, ("%s is already on carp list",
787 sc->sc_if.if_xname));
788 }
789 #endif
790
791 if (!onlist) {
792 struct carp_if *cif;
793 struct carp_softc_container *new_scc, *scc;
794 int inserted = 0;
795
796 cif = kmalloc(sizeof(*cif), M_CARP, M_WAITOK | M_ZERO);
797 TAILQ_INIT(cif);
798
799 new_scc = kmalloc(sizeof(*new_scc), M_CARP, M_WAITOK | M_ZERO);
800 new_scc->scc_softc = sc;
801
802 if (ocif != NULL) {
803 TAILQ_FOREACH(oscc, ocif, scc_link) {
804 if (!inserted &&
805 oscc->scc_softc->sc_vhid > sc->sc_vhid) {
806 TAILQ_INSERT_TAIL(cif, new_scc,
807 scc_link);
808 inserted = 1;
809 }
810
811 scc = kmalloc(sizeof(*scc), M_CARP,
812 M_WAITOK | M_ZERO);
813 scc->scc_softc = oscc->scc_softc;
814 TAILQ_INSERT_TAIL(cif, scc, scc_link);
815 }
816 }
817 if (!inserted)
818 TAILQ_INSERT_TAIL(cif, new_scc, scc_link);
819
820 return cif;
821 } else {
822 return ocif;
823 }
824 }
825
826 static void
827 carp_if_free(struct carp_if *cif)
828 {
829 struct carp_softc_container *scc;
830
831 while ((scc = TAILQ_FIRST(cif)) != NULL) {
832 TAILQ_REMOVE(cif, scc, scc_link);
833 kfree(scc, M_CARP);
834 }
835 kfree(cif, M_CARP);
836 }
837
838 static void
839 carp_detach(struct carp_softc *sc, boolean_t detach, boolean_t del_iaback)
840 {
841 carp_suspend(sc, detach);
842
843 carp_multicast_cleanup(sc);
844 #ifdef INET6
845 carp_multicast6_cleanup(sc);
846 #endif
847
848 if (!sc->sc_dead && detach) {
849 struct carp_vhaddr *vha;
850
851 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
852 carp_deactivate_vhaddr(sc, vha, del_iaback);
853 KKASSERT(sc->sc_naddrs == 0);
854 }
855
856 if (sc->sc_carpdev != NULL) {
857 struct ifnet *ifp = sc->sc_carpdev;
858 struct carp_if *ocif = ifp->if_carp;
859
860 ifp->if_carp = carp_if_remove(ocif, sc);
861 KASSERT(ifp->if_carp != ocif,
862 ("%s carp_if_remove failed", __func__));
863
864 sc->sc_carpdev = NULL;
865 sc->sc_ia = NULL;
866 sc->arpcom.ac_if.if_hwassist = 0;
867
868 /*
869 * Make sure that all protocol threads see the
870 * sc_carpdev and if_carp changes
871 */
872 netmsg_service_sync();
873
874 if (ifp->if_carp == NULL) {
875 /*
876 * No more carp interfaces using
877 * ifp as the backing interface,
878 * move it out of promiscous mode.
879 */
880 ifpromisc(ifp, 0);
881 }
882
883 /*
884 * The old carp list could be safely free now,
885 * since no one can access it.
886 */
887 carp_if_free(ocif);
888 }
889 }
890
891 static void
892 carp_ifdetach_dispatch(netmsg_t msg)
893 {
894 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
895 struct ifnet *ifp = cmsg->nc_carpdev;
896
897 while (ifp->if_carp) {
898 struct carp_softc_container *scc;
899
900 scc = TAILQ_FIRST((struct carp_if *)(ifp->if_carp));
901 carp_detach(scc->scc_softc, TRUE, TRUE);
902 }
903 lwkt_replymsg(&cmsg->base.lmsg, 0);
904 }
905
906 /* Detach an interface from the carp. */
907 static void
908 carp_ifdetach(void *arg __unused, struct ifnet *ifp)
909 {
910 struct netmsg_carp cmsg;
911
912 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp);
913
914 bzero(&cmsg, sizeof(cmsg));
915 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
916 carp_ifdetach_dispatch);
917 cmsg.nc_carpdev = ifp;
918
919 lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
920 }
921
922 /*
923 * process input packet.
924 * we have rearranged checks order compared to the rfc,
925 * but it seems more efficient this way or not possible otherwise.
926 */
927 int
928 carp_proto_input(struct mbuf **mp, int *offp, int proto)
929 {
930 struct mbuf *m = *mp;
931 struct ip *ip = mtod(m, struct ip *);
932 struct ifnet *ifp = m->m_pkthdr.rcvif;
933 struct carp_header *ch;
934 struct carp_softc *sc;
935 int len, iphlen;
936
937 iphlen = *offp;
938 *mp = NULL;
939
940 carpstats.carps_ipackets++;
941
942 if (!carp_opts[CARPCTL_ALLOW]) {
943 m_freem(m);
944 goto back;
945 }
946
947 /* Check if received on a valid carp interface */
948 if (ifp->if_type != IFT_CARP) {
949 carpstats.carps_badif++;
950 CARP_LOG("carp_proto_input: packet received on non-carp "
951 "interface: %s\n", ifp->if_xname);
952 m_freem(m);
953 goto back;
954 }
955
956 if (!CARP_IS_RUNNING(ifp)) {
957 carpstats.carps_badif++;
958 CARP_LOG("carp_proto_input: packet received on stopped carp "
959 "interface: %s\n", ifp->if_xname);
960 m_freem(m);
961 goto back;
962 }
963
964 sc = ifp->if_softc;
965 if (sc->sc_carpdev == NULL) {
966 carpstats.carps_badif++;
967 CARP_LOG("carp_proto_input: packet received on defunc carp "
968 "interface: %s\n", ifp->if_xname);
969 m_freem(m);
970 goto back;
971 }
972
973 if (!IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
974 carpstats.carps_badif++;
975 CARP_LOG("carp_proto_input: non-mcast packet on "
976 "interface: %s\n", ifp->if_xname);
977 m_freem(m);
978 goto back;
979 }
980
981 /* Verify that the IP TTL is CARP_DFLTTL. */
982 if (ip->ip_ttl != CARP_DFLTTL) {
983 carpstats.carps_badttl++;
984 CARP_LOG("carp_proto_input: received ttl %d != %d on %s\n",
985 ip->ip_ttl, CARP_DFLTTL, ifp->if_xname);
986 m_freem(m);
987 goto back;
988 }
989
990 /* Minimal CARP packet size */
991 len = iphlen + sizeof(*ch);
992
993 /*
994 * Verify that the received packet length is
995 * not less than the CARP header
996 */
997 if (m->m_pkthdr.len < len) {
998 carpstats.carps_badlen++;
999 CARP_LOG("packet too short %d on %s\n", m->m_pkthdr.len,
1000 ifp->if_xname);
1001 m_freem(m);
1002 goto back;
1003 }
1004
1005 /* Make sure that CARP header is contiguous */
1006 if (len > m->m_len) {
1007 m = m_pullup(m, len);
1008 if (m == NULL) {
1009 carpstats.carps_hdrops++;
1010 CARP_LOG("carp_proto_input: m_pullup failed\n");
1011 goto back;
1012 }
1013 ip = mtod(m, struct ip *);
1014 }
1015 ch = (struct carp_header *)((uint8_t *)ip + iphlen);
1016
1017 /* Verify the CARP checksum */
1018 if (in_cksum_skip(m, len, iphlen)) {
1019 carpstats.carps_badsum++;
1020 CARP_LOG("carp_proto_input: checksum failed on %s\n",
1021 ifp->if_xname);
1022 m_freem(m);
1023 goto back;
1024 }
1025 carp_proto_input_c(sc, m, ch, AF_INET);
1026 back:
1027 return(IPPROTO_DONE);
1028 }
1029
1030 #ifdef INET6
1031 int
1032 carp6_proto_input(struct mbuf **mp, int *offp, int proto)
1033 {
1034 struct mbuf *m = *mp;
1035 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1036 struct ifnet *ifp = m->m_pkthdr.rcvif;
1037 struct carp_header *ch;
1038 struct carp_softc *sc;
1039 u_int len;
1040
1041 carpstats.carps_ipackets6++;
1042
1043 if (!carp_opts[CARPCTL_ALLOW]) {
1044 m_freem(m);
1045 goto back;
1046 }
1047
1048 /* check if received on a valid carp interface */
1049 if (ifp->if_type != IFT_CARP) {
1050 carpstats.carps_badif++;
1051 CARP_LOG("carp6_proto_input: packet received on non-carp "
1052 "interface: %s\n", ifp->if_xname);
1053 m_freem(m);
1054 goto back;
1055 }
1056
1057 if (!CARP_IS_RUNNING(ifp)) {
1058 carpstats.carps_badif++;
1059 CARP_LOG("carp_proto_input: packet received on stopped carp "
1060 "interface: %s\n", ifp->if_xname);
1061 m_freem(m);
1062 goto back;
1063 }
1064
1065 sc = ifp->if_softc;
1066 if (sc->sc_carpdev == NULL) {
1067 carpstats.carps_badif++;
1068 CARP_LOG("carp6_proto_input: packet received on defunc-carp "
1069 "interface: %s\n", ifp->if_xname);
1070 m_freem(m);
1071 goto back;
1072 }
1073
1074 /* verify that the IP TTL is 255 */
1075 if (ip6->ip6_hlim != CARP_DFLTTL) {
1076 carpstats.carps_badttl++;
1077 CARP_LOG("carp6_proto_input: received ttl %d != 255 on %s\n",
1078 ip6->ip6_hlim, ifp->if_xname);
1079 m_freem(m);
1080 goto back;
1081 }
1082
1083 /* verify that we have a complete carp packet */
1084 len = m->m_len;
1085 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
1086 if (ch == NULL) {
1087 carpstats.carps_badlen++;
1088 CARP_LOG("carp6_proto_input: packet size %u too small\n", len);
1089 goto back;
1090 }
1091
1092 /* verify the CARP checksum */
1093 if (in_cksum_range(m, 0, *offp, sizeof(*ch))) {
1094 carpstats.carps_badsum++;
1095 CARP_LOG("carp6_proto_input: checksum failed, on %s\n",
1096 ifp->if_xname);
1097 m_freem(m);
1098 goto back;
1099 }
1100
1101 carp_proto_input_c(sc, m, ch, AF_INET6);
1102 back:
1103 return (IPPROTO_DONE);
1104 }
1105 #endif /* INET6 */
1106
1107 static void
1108 carp_proto_input_c(struct carp_softc *sc, struct mbuf *m,
1109 struct carp_header *ch, sa_family_t af)
1110 {
1111 struct ifnet *cifp;
1112 uint64_t tmp_counter;
1113 struct timeval sc_tv, ch_tv;
1114
1115 if (sc->sc_vhid != ch->carp_vhid) {
1116 /*
1117 * CARP uses multicast, however, multicast packets
1118 * are tapped to all CARP interfaces on the physical
1119 * interface receiving the CARP packets, so we don't
1120 * update any stats here.
1121 */
1122 m_freem(m);
1123 return;
1124 }
1125 cifp = &sc->sc_if;
1126
1127 /* verify the CARP version. */
1128 if (ch->carp_version != CARP_VERSION) {
1129 carpstats.carps_badver++;
1130 CARP_LOG("%s; invalid version %d\n", cifp->if_xname,
1131 ch->carp_version);
1132 m_freem(m);
1133 return;
1134 }
1135
1136 /* verify the hash */
1137 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
1138 carpstats.carps_badauth++;
1139 CARP_LOG("%s: incorrect hash\n", cifp->if_xname);
1140 m_freem(m);
1141 return;
1142 }
1143
1144 tmp_counter = ntohl(ch->carp_counter[0]);
1145 tmp_counter = tmp_counter<<32;
1146 tmp_counter += ntohl(ch->carp_counter[1]);
1147
1148 /* XXX Replay protection goes here */
1149
1150 sc->sc_init_counter = 0;
1151 sc->sc_counter = tmp_counter;
1152
1153 sc_tv.tv_sec = sc->sc_advbase;
1154 if (carp_suppress_preempt && sc->sc_advskew < 240)
1155 sc_tv.tv_usec = 240 * 1000000 / 256;
1156 else
1157 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1158 ch_tv.tv_sec = ch->carp_advbase;
1159 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
1160
1161 switch (sc->sc_state) {
1162 case INIT:
1163 break;
1164
1165 case MASTER:
1166 /*
1167 * If we receive an advertisement from a master who's going to
1168 * be more frequent than us, go into BACKUP state.
1169 */
1170 if (timevalcmp(&sc_tv, &ch_tv, >) ||
1171 timevalcmp(&sc_tv, &ch_tv, ==)) {
1172 callout_stop(&sc->sc_ad_tmo);
1173 CARP_DEBUG("%s: MASTER -> BACKUP "
1174 "(more frequent advertisement received)\n",
1175 cifp->if_xname);
1176 carp_set_state(sc, BACKUP);
1177 carp_setrun(sc, 0);
1178 if (carp_opts[CARPCTL_SETROUTE])
1179 carp_setroute(sc, RTM_DELETE);
1180 }
1181 break;
1182
1183 case BACKUP:
1184 /*
1185 * If we're pre-empting masters who advertise slower than us,
1186 * and this one claims to be slower, treat him as down.
1187 */
1188 if (carp_opts[CARPCTL_PREEMPT] &&
1189 timevalcmp(&sc_tv, &ch_tv, <)) {
1190 CARP_DEBUG("%s: BACKUP -> MASTER "
1191 "(preempting a slower master)\n", cifp->if_xname);
1192 carp_master_down(sc);
1193 break;
1194 }
1195
1196 /*
1197 * If the master is going to advertise at such a low frequency
1198 * that he's guaranteed to time out, we'd might as well just
1199 * treat him as timed out now.
1200 */
1201 sc_tv.tv_sec = sc->sc_advbase * 3;
1202 if (timevalcmp(&sc_tv, &ch_tv, <)) {
1203 CARP_DEBUG("%s: BACKUP -> MASTER (master timed out)\n",
1204 cifp->if_xname);
1205 carp_master_down(sc);
1206 break;
1207 }
1208
1209 /*
1210 * Otherwise, we reset the counter and wait for the next
1211 * advertisement.
1212 */
1213 carp_setrun(sc, af);
1214 break;
1215 }
1216 m_freem(m);
1217 }
1218
1219 struct mbuf *
1220 carp_input(void *v, struct mbuf *m)
1221 {
1222 struct carp_if *cif = v;
1223 struct ether_header *eh;
1224 struct carp_softc_container *scc;
1225 struct ifnet *ifp;
1226
1227 eh = mtod(m, struct ether_header *);
1228
1229 ifp = carp_forus(cif, eh->ether_dhost);
1230 if (ifp != NULL) {
1231 ether_reinput_oncpu(ifp, m, REINPUT_RUNBPF);
1232 return NULL;
1233 }
1234
1235 if ((m->m_flags & (M_BCAST | M_MCAST)) == 0)
1236 return m;
1237
1238 /*
1239 * XXX Should really check the list of multicast addresses
1240 * for each CARP interface _before_ copying.
1241 */
1242 TAILQ_FOREACH(scc, cif, scc_link) {
1243 struct carp_softc *sc = scc->scc_softc;
1244 struct mbuf *m0;
1245
1246 if ((sc->sc_if.if_flags & IFF_UP) == 0)
1247 continue;
1248
1249 m0 = m_dup(m, M_NOWAIT);
1250 if (m0 == NULL)
1251 continue;
1252
1253 ether_reinput_oncpu(&sc->sc_if, m0, REINPUT_RUNBPF);
1254 }
1255 return m;
1256 }
1257
1258 static void
1259 carp_prepare_ad(struct carp_softc *sc, struct carp_header *ch)
1260 {
1261 if (sc->sc_init_counter) {
1262 /* this could also be seconds since unix epoch */
1263 sc->sc_counter = karc4random();
1264 sc->sc_counter = sc->sc_counter << 32;
1265 sc->sc_counter += karc4random();
1266 } else {
1267 sc->sc_counter++;
1268 }
1269
1270 ch->carp_counter[0] = htonl((sc->sc_counter >> 32) & 0xffffffff);
1271 ch->carp_counter[1] = htonl(sc->sc_counter & 0xffffffff);
1272
1273 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
1274 }
1275
1276 static void
1277 carp_send_ad_all(void)
1278 {
1279 struct carp_softc *sc;
1280
1281 LIST_FOREACH(sc, &carpif_list, sc_next) {
1282 if (sc->sc_carpdev == NULL)
1283 continue;
1284
1285 if (CARP_IS_RUNNING(&sc->sc_if) && sc->sc_state == MASTER)
1286 carp_send_ad(sc);
1287 }
1288 }
1289
1290 static void
1291 carp_send_ad_timeout(void *xsc)
1292 {
1293 struct carp_softc *sc = xsc;
1294 struct netmsg_carp *cmsg = &sc->sc_ad_msg;
1295
1296 KASSERT(mycpuid == 0, ("%s not on cpu0 but on cpu%d",
1297 __func__, mycpuid));
1298
1299 crit_enter();
1300 if (cmsg->base.lmsg.ms_flags & MSGF_DONE)
1301 lwkt_sendmsg_oncpu(netisr_cpuport(0), &cmsg->base.lmsg);
1302 crit_exit();
1303 }
1304
1305 static void
1306 carp_send_ad_timeout_dispatch(netmsg_t msg)
1307 {
1308 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
1309 struct carp_softc *sc = cmsg->nc_softc;
1310
1311 /* Reply ASAP */
1312 crit_enter();
1313 lwkt_replymsg(&cmsg->base.lmsg, 0);
1314 crit_exit();
1315
1316 carp_send_ad(sc);
1317 }
1318
1319 static void
1320 carp_send_ad(struct carp_softc *sc)
1321 {
1322 struct ifnet *cifp = &sc->sc_if;
1323 struct carp_header ch;
1324 struct timeval tv;
1325 struct carp_header *ch_ptr;
1326 struct mbuf *m;
1327 int len, advbase, advskew;
1328
1329 if (!CARP_IS_RUNNING(cifp)) {
1330 /* Bow out */
1331 advbase = 255;
1332 advskew = 255;
1333 } else {
1334 advbase = sc->sc_advbase;
1335 if (!carp_suppress_preempt || sc->sc_advskew > 240)
1336 advskew = sc->sc_advskew;
1337 else
1338 advskew = 240;
1339 tv.tv_sec = advbase;
1340 tv.tv_usec = advskew * 1000000 / 256;
1341 }
1342
1343 ch.carp_version = CARP_VERSION;
1344 ch.carp_type = CARP_ADVERTISEMENT;
1345 ch.carp_vhid = sc->sc_vhid;
1346 ch.carp_advbase = advbase;
1347 ch.carp_advskew = advskew;
1348 ch.carp_authlen = 7; /* XXX DEFINE */
1349 ch.carp_pad1 = 0; /* must be zero */
1350 ch.carp_cksum = 0;
1351
1352 #ifdef INET
1353 if (sc->sc_ia != NULL) {
1354 struct ip *ip;
1355
1356 MGETHDR(m, M_NOWAIT, MT_HEADER);
1357 if (m == NULL) {
1358 IFNET_STAT_INC(cifp, oerrors, 1);
1359 carpstats.carps_onomem++;
1360 /* XXX maybe less ? */
1361 if (advbase != 255 || advskew != 255)
1362 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1363 carp_send_ad_timeout, sc);
1364 return;
1365 }
1366 len = sizeof(*ip) + sizeof(ch);
1367 m->m_pkthdr.len = len;
1368 m->m_pkthdr.rcvif = NULL;
1369 m->m_len = len;
1370 MH_ALIGN(m, m->m_len);
1371 m->m_flags |= M_MCAST;
1372 if (carp_prio_ad)
1373 m->m_flags |= M_PRIO;
1374 ip = mtod(m, struct ip *);
1375 ip->ip_v = IPVERSION;
1376 ip->ip_hl = sizeof(*ip) >> 2;
1377 ip->ip_tos = IPTOS_LOWDELAY;
1378 ip->ip_len = htons(len);
1379 ip->ip_id = ip_newid();
1380 ip->ip_off = htons(IP_DF);
1381 ip->ip_ttl = CARP_DFLTTL;
1382 ip->ip_p = IPPROTO_CARP;
1383 ip->ip_sum = 0;
1384 ip->ip_src = sc->sc_ia->ia_addr.sin_addr;
1385 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
1386
1387 ch_ptr = (struct carp_header *)(&ip[1]);
1388 bcopy(&ch, ch_ptr, sizeof(ch));
1389 carp_prepare_ad(sc, ch_ptr);
1390 ch_ptr->carp_cksum = in_cksum_skip(m, len, sizeof(*ip));
1391
1392 getmicrotime(&cifp->if_lastchange);
1393 IFNET_STAT_INC(cifp, opackets, 1);
1394 IFNET_STAT_INC(cifp, obytes, len);
1395 carpstats.carps_opackets++;
1396
1397 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) {
1398 IFNET_STAT_INC(cifp, oerrors, 1);
1399 if (sc->sc_sendad_errors < INT_MAX)
1400 sc->sc_sendad_errors++;
1401 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1402 carp_suppress_preempt++;
1403 if (carp_suppress_preempt == 1) {
1404 carp_send_ad_all();
1405 }
1406 }
1407 sc->sc_sendad_success = 0;
1408 } else {
1409 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1410 if (++sc->sc_sendad_success >=
1411 CARP_SENDAD_MIN_SUCCESS) {
1412 carp_suppress_preempt--;
1413 sc->sc_sendad_errors = 0;
1414 }
1415 } else {
1416 sc->sc_sendad_errors = 0;
1417 }
1418 }
1419 }
1420 #endif /* INET */
1421 #ifdef INET6
1422 if (sc->sc_ia6) {
1423 struct ip6_hdr *ip6;
1424
1425 MGETHDR(m, M_NOWAIT, MT_HEADER);
1426 if (m == NULL) {
1427 IFNET_STAT_INC(cifp, oerrors, 1);
1428 carpstats.carps_onomem++;
1429 /* XXX maybe less ? */
1430 if (advbase != 255 || advskew != 255)
1431 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1432 carp_send_ad_timeout, sc);
1433 return;
1434 }
1435 len = sizeof(*ip6) + sizeof(ch);
1436 m->m_pkthdr.len = len;
1437 m->m_pkthdr.rcvif = NULL;
1438 m->m_len = len;
1439 MH_ALIGN(m, m->m_len);
1440 m->m_flags |= M_MCAST;
1441 ip6 = mtod(m, struct ip6_hdr *);
1442 bzero(ip6, sizeof(*ip6));
1443 ip6->ip6_vfc |= IPV6_VERSION;
1444 ip6->ip6_hlim = CARP_DFLTTL;
1445 ip6->ip6_nxt = IPPROTO_CARP;
1446 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src,
1447 sizeof(struct in6_addr));
1448 /* set the multicast destination */
1449
1450 ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
1451 ip6->ip6_dst.s6_addr8[15] = 0x12;
1452 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
1453 IFNET_STAT_INC(cifp, oerrors, 1);
1454 m_freem(m);
1455 CARP_LOG("%s: in6_setscope failed\n", __func__);
1456 return;
1457 }
1458
1459 ch_ptr = (struct carp_header *)(&ip6[1]);
1460 bcopy(&ch, ch_ptr, sizeof(ch));
1461 carp_prepare_ad(sc, ch_ptr);
1462 ch_ptr->carp_cksum = in_cksum_skip(m, len, sizeof(*ip6));
1463
1464 getmicrotime(&cifp->if_lastchange);
1465 IFNET_STAT_INC(cifp, opackets, 1);
1466 IFNET_STAT_INC(cifp, obytes, len);
1467 carpstats.carps_opackets6++;
1468
1469 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) {
1470 IFNET_STAT_INC(cifp, oerrors, 1);
1471 if (sc->sc_sendad_errors < INT_MAX)
1472 sc->sc_sendad_errors++;
1473 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1474 carp_suppress_preempt++;
1475 if (carp_suppress_preempt == 1) {
1476 carp_send_ad_all();
1477 }
1478 }
1479 sc->sc_sendad_success = 0;
1480 } else {
1481 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1482 if (++sc->sc_sendad_success >=
1483 CARP_SENDAD_MIN_SUCCESS) {
1484 carp_suppress_preempt--;
1485 sc->sc_sendad_errors = 0;
1486 }
1487 } else {
1488 sc->sc_sendad_errors = 0;
1489 }
1490 }
1491 }
1492 #endif /* INET6 */
1493
1494 if (advbase != 255 || advskew != 255)
1495 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1496 carp_send_ad_timeout, sc);
1497 }
1498
1499 /*
1500 * Broadcast a gratuitous ARP request containing
1501 * the virtual router MAC address for each IP address
1502 * associated with the virtual router.
1503 */
1504 static void
1505 carp_send_arp(struct carp_softc *sc)
1506 {
1507 const struct carp_vhaddr *vha;
1508
1509 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1510 if (vha->vha_iaback == NULL)
1511 continue;
1512 arp_gratuitous(&sc->sc_if, &vha->vha_ia->ia_ifa);
1513 }
1514 }
1515
1516 #ifdef INET6
1517 static void
1518 carp_send_na(struct carp_softc *sc)
1519 {
1520 struct ifaddr_container *ifac;
1521 struct in6_addr *in6;
1522 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1523
1524 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
1525 struct ifaddr *ifa = ifac->ifa;
1526
1527 if (ifa->ifa_addr->sa_family != AF_INET6)
1528 continue;
1529
1530 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
1531 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1532 ND_NA_FLAG_OVERRIDE, 1, NULL);
1533 DELAY(1000); /* XXX */
1534 }
1535 }
1536 #endif /* INET6 */
1537
1538 #ifdef notyet
1539 static __inline const struct carp_vhaddr *
1540 carp_find_addr(const struct carp_softc *sc, const struct in_addr *addr)
1541 {
1542 struct carp_vhaddr *vha;
1543
1544 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1545 if (vha->vha_iaback == NULL)
1546 continue;
1547
1548 if (vha->vha_ia->ia_addr.sin_addr.s_addr == addr->s_addr)
1549 return vha;
1550 }
1551 return NULL;
1552 }
1553
1554 static int
1555 carp_iamatch_balance(const struct carp_if *cif, const struct in_addr *itaddr,
1556 const struct in_addr *isaddr, uint8_t **enaddr)
1557 {
1558 const struct carp_softc *vh;
1559 int index, count = 0;
1560
1561 /*
1562 * XXX proof of concept implementation.
1563 * We use the source ip to decide which virtual host should
1564 * handle the request. If we're master of that virtual host,
1565 * then we respond, otherwise, just drop the arp packet on
1566 * the floor.
1567 */
1568
1569 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1570 if (!CARP_IS_RUNNING(&vh->sc_if))
1571 continue;
1572
1573 if (carp_find_addr(vh, itaddr) != NULL)
1574 count++;
1575 }
1576 if (count == 0)
1577 return 0;
1578
1579 /* this should be a hash, like pf_hash() */
1580 index = ntohl(isaddr->s_addr) % count;
1581 count = 0;
1582
1583 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1584 if (!CARP_IS_RUNNING(&vh->sc_if))
1585 continue;
1586
1587 if (carp_find_addr(vh, itaddr) == NULL)
1588 continue;
1589
1590 if (count == index) {
1591 if (vh->sc_state == MASTER) {
1592 *enaddr = IF_LLADDR(&vh->sc_if);
1593 return 1;
1594 } else {
1595 return 0;
1596 }
1597 }
1598 count++;
1599 }
1600 return 0;
1601 }
1602 #endif
1603
1604 int
1605 carp_iamatch(const struct in_ifaddr *ia)
1606 {
1607 const struct carp_softc *sc = ia->ia_ifp->if_softc;
1608
1609 ASSERT_NETISR0;
1610
1611 #ifdef notyet
1612 if (carp_opts[CARPCTL_ARPBALANCE])
1613 return carp_iamatch_balance(cif, itaddr, isaddr, enaddr);
1614 #endif
1615
1616 if (!CARP_IS_RUNNING(&sc->sc_if) || sc->sc_state != MASTER)
1617 return 0;
1618
1619 return 1;
1620 }
1621
1622 #ifdef INET6
1623 struct ifaddr *
1624 carp_iamatch6(void *v, struct in6_addr *taddr)
1625 {
1626 #ifdef foo
1627 struct carp_if *cif = v;
1628 struct carp_softc *vh;
1629
1630 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1631 struct ifaddr_container *ifac;
1632
1633 TAILQ_FOREACH(ifac, &vh->sc_if.if_addrheads[mycpuid],
1634 ifa_link) {
1635 struct ifaddr *ifa = ifac->ifa;
1636
1637 if (IN6_ARE_ADDR_EQUAL(taddr,
1638 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1639 CARP_IS_RUNNING(&vh->sc_if) &&
1640 vh->sc_state == MASTER) {
1641 return (ifa);
1642 }
1643 }
1644 }
1645 #endif
1646 return (NULL);
1647 }
1648
1649 void *
1650 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr)
1651 {
1652 #ifdef foo
1653 struct m_tag *mtag;
1654 struct carp_if *cif = v;
1655 struct carp_softc *sc;
1656
1657 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
1658 struct ifaddr_container *ifac;
1659
1660 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid],
1661 ifa_link) {
1662 struct ifaddr *ifa = ifac->ifa;
1663
1664 if (IN6_ARE_ADDR_EQUAL(taddr,
1665 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1666 CARP_IS_RUNNING(&sc->sc_if)) {
1667 struct ifnet *ifp = &sc->sc_if;
1668
1669 mtag = m_tag_get(PACKET_TAG_CARP,
1670 sizeof(struct ifnet *), M_NOWAIT);
1671 if (mtag == NULL) {
1672 /* better a bit than nothing */
1673 return (IF_LLADDR(ifp));
1674 }
1675 bcopy(&ifp, (caddr_t)(mtag + 1),
1676 sizeof(struct ifnet *));
1677 m_tag_prepend(m, mtag);
1678
1679 return (IF_LLADDR(ifp));
1680 }
1681 }
1682 }
1683 #endif
1684 return (NULL);
1685 }
1686 #endif
1687
1688 static struct ifnet *
1689 carp_forus(struct carp_if *cif, const uint8_t *dhost)
1690 {
1691 struct carp_softc_container *scc;
1692
1693 if (memcmp(dhost, carp_etheraddr, ETHER_ADDR_LEN - 1) != 0)
1694 return NULL;
1695
1696 TAILQ_FOREACH(scc, cif, scc_link) {
1697 struct carp_softc *sc = scc->scc_softc;
1698 struct ifnet *ifp = &sc->sc_if;
1699
1700 if (CARP_IS_RUNNING(ifp) && sc->sc_state == MASTER &&
1701 !bcmp(dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN))
1702 return ifp;
1703 }
1704 return NULL;
1705 }
1706
1707 static void
1708 carp_master_down_timeout(void *xsc)
1709 {
1710 struct carp_softc *sc = xsc;
1711 struct netmsg_carp *cmsg = &sc->sc_md_msg;
1712
1713 KASSERT(mycpuid == 0, ("%s not on cpu0 but on cpu%d",
1714 __func__, mycpuid));
1715
1716 crit_enter();
1717 if (cmsg->base.lmsg.ms_flags & MSGF_DONE)
1718 lwkt_sendmsg_oncpu(netisr_cpuport(0), &cmsg->base.lmsg);
1719 crit_exit();
1720 }
1721
1722 static void
1723 carp_master_down_timeout_dispatch(netmsg_t msg)
1724 {
1725 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
1726 struct carp_softc *sc = cmsg->nc_softc;
1727
1728 /* Reply ASAP */
1729 crit_enter();
1730 lwkt_replymsg(&cmsg->base.lmsg, 0);
1731 crit_exit();
1732
1733 CARP_DEBUG("%s: BACKUP -> MASTER (master timed out)\n",
1734 sc->sc_if.if_xname);
1735 carp_master_down(sc);
1736 }
1737
1738 static void
1739 carp_master_down(struct carp_softc *sc)
1740 {
1741 switch (sc->sc_state) {
1742 case INIT:
1743 kprintf("%s: master_down event in INIT state\n",
1744 sc->sc_if.if_xname);
1745 break;
1746
1747 case MASTER:
1748 break;
1749
1750 case BACKUP:
1751 carp_set_state(sc, MASTER);
1752 carp_send_ad(sc);
1753 carp_send_arp(sc);
1754 #ifdef INET6
1755 carp_send_na(sc);
1756 #endif /* INET6 */
1757 carp_setrun(sc, 0);
1758 if (carp_opts[CARPCTL_SETROUTE])
1759 carp_setroute(sc, RTM_ADD);
1760 break;
1761 }
1762 }
1763
1764 /*
1765 * When in backup state, af indicates whether to reset the master down timer
1766 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1767 */
1768 static void
1769 carp_setrun(struct carp_softc *sc, sa_family_t af)
1770 {
1771 struct ifnet *cifp = &sc->sc_if;
1772 struct timeval tv;
1773
1774 if (sc->sc_carpdev == NULL) {
1775 carp_set_state(sc, INIT);
1776 return;
1777 }
1778
1779 if ((cifp->if_flags & IFF_RUNNING) && sc->sc_vhid > 0 &&
1780 (sc->sc_naddrs || sc->sc_naddrs6)) {
1781 /* Nothing */
1782 } else {
1783 if (carp_opts[CARPCTL_SETROUTE])
1784 carp_setroute(sc, RTM_DELETE);
1785 return;
1786 }
1787
1788 switch (sc->sc_state) {
1789 case INIT:
1790 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) {
1791 carp_send_ad(sc);
1792 carp_send_arp(sc);
1793 #ifdef INET6
1794 carp_send_na(sc);
1795 #endif /* INET6 */
1796 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n",
1797 cifp->if_xname);
1798 carp_set_state(sc, MASTER);
1799 if (carp_opts[CARPCTL_SETROUTE])
1800 carp_setroute(sc, RTM_ADD);
1801 } else {
1802 CARP_DEBUG("%s: INIT -> BACKUP\n", cifp->if_xname);
1803 carp_set_state(sc, BACKUP);
1804 if (carp_opts[CARPCTL_SETROUTE])
1805 carp_setroute(sc, RTM_DELETE);
1806 carp_setrun(sc, 0);
1807 }
1808 break;
1809
1810 case BACKUP:
1811 callout_stop(&sc->sc_ad_tmo);
1812 tv.tv_sec = 3 * sc->sc_advbase;
1813 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1814 switch (af) {
1815 #ifdef INET
1816 case AF_INET:
1817 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
1818 carp_master_down_timeout, sc);
1819 break;
1820 #endif /* INET */
1821 #ifdef INET6
1822 case AF_INET6:
1823 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
1824 carp_master_down_timeout, sc);
1825 break;
1826 #endif /* INET6 */
1827 default:
1828 if (sc->sc_naddrs)
1829 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
1830 carp_master_down_timeout, sc);
1831 if (sc->sc_naddrs6)
1832 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
1833 carp_master_down_timeout, sc);
1834 break;
1835 }
1836 break;
1837
1838 case MASTER:
1839 tv.tv_sec = sc->sc_advbase;
1840 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1841 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1842 carp_send_ad_timeout, sc);
1843 break;
1844 }
1845 }
1846
1847 static void
1848 carp_multicast_cleanup(struct carp_softc *sc)
1849 {
1850 struct ip_moptions *imo = &sc->sc_imo;
1851
1852 if (imo->imo_num_memberships == 0)
1853 return;
1854 KKASSERT(imo->imo_num_memberships == 1);
1855
1856 in_delmulti(imo->imo_membership[0]);
1857 imo->imo_membership[0] = NULL;
1858 imo->imo_num_memberships = 0;
1859 imo->imo_multicast_ifp = NULL;
1860 }
1861
1862 #ifdef INET6
1863 static void
1864 carp_multicast6_cleanup(struct carp_softc *sc)
1865 {
1866 struct ip6_moptions *im6o = &sc->sc_im6o;
1867
1868 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1869 struct in6_multi_mship *imm =
1870 LIST_FIRST(&im6o->im6o_memberships);
1871
1872 LIST_REMOVE(imm, i6mm_chain);
1873 in6_leavegroup(imm);
1874 }
1875 im6o->im6o_multicast_ifp = NULL;
1876 }
1877 #endif
1878
1879 static void
1880 carp_ioctl_getvhaddr_dispatch(netmsg_t msg)
1881 {
1882 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
1883 struct carp_softc *sc = cmsg->nc_softc;
1884 const struct carp_vhaddr *vha;
1885 struct ifcarpvhaddr *carpa, *carpa0;
1886 int count, len, error = 0;
1887
1888 count = 0;
1889 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
1890 ++count;
1891
1892 if (cmsg->nc_datalen == 0) {
1893 cmsg->nc_datalen = count * sizeof(*carpa);
1894 goto back;
1895 } else if (count == 0 || cmsg->nc_datalen < sizeof(*carpa)) {
1896 cmsg->nc_datalen = 0;
1897 goto back;
1898 }
1899 len = min(cmsg->nc_datalen, sizeof(*carpa) * count);
1900 KKASSERT(len >= sizeof(*carpa));
1901
1902 carpa0 = carpa = kmalloc(len, M_TEMP, M_WAITOK | M_NULLOK | M_ZERO);
1903 if (carpa == NULL) {
1904 error = ENOMEM;
1905 goto back;
1906 }
1907
1908 count = 0;
1909 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1910 if (len < sizeof(*carpa))
1911 break;
1912
1913 carpa->carpa_flags = vha->vha_flags;
1914 carpa->carpa_addr.sin_family = AF_INET;
1915 carpa->carpa_addr.sin_addr = vha->vha_ia->ia_addr.sin_addr;
1916
1917 carpa->carpa_baddr.sin_family = AF_INET;
1918 if (vha->vha_iaback == NULL) {
1919 carpa->carpa_baddr.sin_addr.s_addr = INADDR_ANY;
1920 } else {
1921 carpa->carpa_baddr.sin_addr =
1922 vha->vha_iaback->ia_addr.sin_addr;
1923 }
1924
1925 ++carpa;
1926 ++count;
1927 len -= sizeof(*carpa);
1928 }
1929 cmsg->nc_datalen = sizeof(*carpa) * count;
1930 KKASSERT(cmsg->nc_datalen > 0);
1931
1932 cmsg->nc_data = carpa0;
1933
1934 back:
1935 lwkt_replymsg(&cmsg->base.lmsg, error);
1936 }
1937
1938 static int
1939 carp_ioctl_getvhaddr(struct carp_softc *sc, struct ifdrv *ifd)
1940 {
1941 struct ifnet *ifp = &sc->arpcom.ac_if;
1942 struct netmsg_carp cmsg;
1943 int error;
1944
1945 ASSERT_IFNET_SERIALIZED_ALL(ifp);
1946 ifnet_deserialize_all(ifp);
1947
1948 bzero(&cmsg, sizeof(cmsg));
1949 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
1950 carp_ioctl_getvhaddr_dispatch);
1951 cmsg.nc_softc = sc;
1952 cmsg.nc_datalen = ifd->ifd_len;
1953
1954 error = lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
1955
1956 if (!error) {
1957 if (cmsg.nc_data != NULL) {
1958 error = copyout(cmsg.nc_data, ifd->ifd_data,
1959 cmsg.nc_datalen);
1960 kfree(cmsg.nc_data, M_TEMP);
1961 }
1962 ifd->ifd_len = cmsg.nc_datalen;
1963 } else {
1964 KASSERT(cmsg.nc_data == NULL,
1965 ("%s temp vhaddr is alloc upon error", __func__));
1966 }
1967
1968 ifnet_serialize_all(ifp);
1969 return error;
1970 }
1971
1972 static int
1973 carp_config_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
1974 struct in_ifaddr *ia_del)
1975 {
1976 struct ifnet *ifp;
1977 struct in_ifaddr *ia_if;
1978 const struct in_ifaddr *ia_vha;
1979 struct in_ifaddr_container *iac;
1980 int own, ia_match_carpdev;
1981
1982 KKASSERT(vha->vha_ia != NULL);
1983 ia_vha = vha->vha_ia;
1984
1985 ia_if = NULL;
1986 own = 0;
1987 ia_match_carpdev = 0;
1988 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1989 struct in_ifaddr *ia = iac->ia;
1990
1991 if (ia == ia_del)
1992 continue;
1993
1994 if (ia->ia_ifp->if_type == IFT_CARP)
1995 continue;
1996
1997 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
1998 continue;
1999
2000 /* and, yeah, we need a multicast-capable iface too */
2001 if ((ia->ia_ifp->if_flags & IFF_MULTICAST) == 0)
2002 continue;
2003
2004 if (ia_vha->ia_subnetmask == ia->ia_subnetmask &&
2005 ia_vha->ia_subnet == ia->ia_subnet) {
2006 if (ia_vha->ia_addr.sin_addr.s_addr ==
2007 ia->ia_addr.sin_addr.s_addr)
2008 own = 1;
2009 if (ia_if == NULL) {
2010 ia_if = ia;
2011 } else if (sc->sc_carpdev != NULL &&
2012 sc->sc_carpdev == ia->ia_ifp) {
2013 ia_if = ia;
2014 if (ia_if->ia_flags & IFA_ROUTE) {
2015 /*
2016 * Address with prefix route
2017 * is prefered
2018 */
2019 break;
2020 }
2021 ia_match_carpdev = 1;
2022 } else if (!ia_match_carpdev) {
2023 if (ia->ia_flags & IFA_ROUTE) {
2024 /*
2025 * Address with prefix route
2026 * is prefered over others.
2027 */
2028 ia_if = ia;
2029 }
2030 }
2031 }
2032 }
2033
2034 carp_deactivate_vhaddr(sc, vha, FALSE);
2035 if (!ia_if)
2036 return ENOENT;
2037
2038 ifp = ia_if->ia_ifp;
2039
2040 /* XXX Don't allow parent iface to be changed */
2041 if (sc->sc_carpdev != NULL && sc->sc_carpdev != ifp)
2042 return EEXIST;
2043
2044 return carp_activate_vhaddr(sc, vha, ifp, ia_if, own);
2045 }
2046
2047 static void
2048 carp_add_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
2049 {
2050 struct carp_vhaddr *vha_new;
2051 struct in_ifaddr *carp_ia;
2052 #ifdef INVARIANTS
2053 struct carp_vhaddr *vha;
2054 #endif
2055
2056 KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
2057 carp_ia = ifatoia(carp_ifa);
2058
2059 #ifdef INVARIANTS
2060 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
2061 KKASSERT(vha->vha_ia != NULL && vha->vha_ia != carp_ia);
2062 #endif
2063
2064 vha_new = kmalloc(sizeof(*vha_new), M_CARP, M_WAITOK | M_ZERO);
2065 vha_new->vha_ia = carp_ia;
2066 carp_insert_vhaddr(sc, vha_new);
2067
2068 if (carp_config_vhaddr(sc, vha_new, NULL) != 0) {
2069 /*
2070 * If the above configuration fails, it may only mean
2071 * that the new address is problematic. However, the
2072 * carp(4) interface may already have several working
2073 * addresses. Since the expected behaviour of
2074 * SIOC[AS]IFADDR is to put the NIC into working state,
2075 * we try starting the state machine manually here with
2076 * the hope that the carp(4)'s previously working
2077 * addresses still could be brought up.
2078 */
2079 carp_hmac_prepare(sc);
2080 carp_set_state(sc, INIT);
2081 carp_setrun(sc, 0);
2082 }
2083 }
2084
2085 static void
2086 carp_del_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
2087 {
2088 struct carp_vhaddr *vha;
2089 struct in_ifaddr *carp_ia;
2090
2091 KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
2092 carp_ia = ifatoia(carp_ifa);
2093
2094 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
2095 KKASSERT(vha->vha_ia != NULL);
2096 if (vha->vha_ia == carp_ia)
2097 break;
2098 }
2099 KASSERT(vha != NULL, ("no corresponding vhaddr %p", carp_ifa));
2100
2101 /*
2102 * Remove the vhaddr from the list before deactivating
2103 * the vhaddr, so that the HMAC could be correctly
2104 * updated in carp_deactivate_vhaddr()
2105 */
2106 carp_remove_vhaddr(sc, vha);
2107
2108 carp_deactivate_vhaddr(sc, vha, FALSE);
2109 kfree(vha, M_CARP);
2110 }
2111
2112 static void
2113 carp_config_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
2114 {
2115 struct carp_vhaddr *vha;
2116 struct in_ifaddr *carp_ia;
2117
2118 KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
2119 carp_ia = ifatoia(carp_ifa);
2120
2121 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
2122 KKASSERT(vha->vha_ia != NULL);
2123 if (vha->vha_ia == carp_ia)
2124 break;
2125 }
2126 KASSERT(vha != NULL, ("no corresponding vhaddr %p", carp_ifa));
2127
2128 /* Remove then reinsert, to keep the vhaddr list sorted */
2129 carp_remove_vhaddr(sc, vha);
2130 carp_insert_vhaddr(sc, vha);
2131
2132 if (carp_config_vhaddr(sc, vha, NULL) != 0) {
2133 /* See the comment in carp_add_addr() */
2134 carp_hmac_prepare(sc);
2135 carp_set_state(sc, INIT);
2136 carp_setrun(sc, 0);
2137 }
2138 }
2139
2140 #ifdef notyet
2141
2142 #ifdef INET6
2143 static int
2144 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
2145 {
2146 struct ifnet *ifp;
2147 struct carp_if *cif;
2148 struct in6_ifaddr *ia, *ia_if;
2149 struct ip6_moptions *im6o = &sc->sc_im6o;
2150 struct in6_multi_mship *imm;
2151 struct in6_addr in6;
2152 int own, error;
2153
2154 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
2155 carp_setrun(sc, 0);
2156 return (0);
2157 }
2158
2159 /* we have to do it by hands to check we won't match on us */
2160 ia_if = NULL; own = 0;
2161 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
2162 int i;
2163
2164 for (i = 0; i < 4; i++) {
2165 if ((sin6->sin6_addr.s6_addr32[i] &
2166 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
2167 (ia->ia_addr.sin6_addr.s6_addr32[i] &
2168 ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
2169 break;
2170 }
2171 /* and, yeah, we need a multicast-capable iface too */
2172 if (ia->ia_ifp != &sc->sc_if &&
2173 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
2174 (i == 4)) {
2175 if (!ia_if)
2176 ia_if = ia;
2177 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2178 &ia->ia_addr.sin6_addr))
2179 own++;
2180 }
2181 }
2182
2183 if (!ia_if)
2184 return (EADDRNOTAVAIL);
2185 ia = ia_if;
2186 ifp = ia->ia_ifp;
2187
2188 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
2189 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp))
2190 return (EADDRNOTAVAIL);
2191
2192 if (!sc->sc_naddrs6) {
2193 im6o->im6o_multicast_ifp = ifp;
2194
2195 /* join CARP multicast address */
2196 bzero(&in6, sizeof(in6));
2197 in6.s6_addr16[0] = htons(0xff02);
2198 in6.s6_addr8[15] = 0x12;
2199 if (in6_setscope(&in6, ifp, NULL) != 0)
2200 goto cleanup;
2201 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
2202 goto cleanup;
2203 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
2204
2205 /* join solicited multicast address */
2206 bzero(&in6, sizeof(in6));
2207 in6.s6_addr16[0] = htons(0xff02);
2208 in6.s6_addr32[1] = 0;
2209 in6.s6_addr32[2] = htonl(1);
2210 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3];
2211 in6.s6_addr8[12] = 0xff;
2212 if (in6_setscope(&in6, ifp, NULL) != 0)
2213 goto cleanup;
2214 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
2215 goto cleanup;
2216 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
2217 }
2218
2219 #ifdef foo
2220 if (!ifp->if_carp) {
2221 cif = kmalloc(sizeof(*cif), M_CARP, M_WAITOK | M_ZERO);
2222
2223 if ((error = ifpromisc(ifp, 1))) {
2224 kfree(cif, M_CARP);
2225 goto cleanup;
2226 }
2227
2228 TAILQ_INIT(&cif->vhif_vrs);
2229 ifp->if_carp = cif;
2230 } else {
2231 struct carp_softc *vr;
2232
2233 cif = ifp->if_carp;
2234 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
2235 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
2236 error = EINVAL;
2237 goto cleanup;
2238 }
2239 }
2240 }
2241 #endif
2242 sc->sc_ia6 = ia;
2243 sc->sc_carpdev = ifp;
2244
2245 #ifdef foo
2246 { /* XXX prevent endless loop if already in queue */
2247 struct carp_softc *vr, *after = NULL;
2248 int myself = 0;
2249 cif = ifp->if_carp;
2250
2251 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
2252 if (vr == sc)
2253 myself = 1;
2254 if (vr->sc_vhid < sc->sc_vhid)
2255 after = vr;
2256 }
2257
2258 if (!myself) {
2259 /* We're trying to keep things in order */
2260 if (after == NULL)
2261 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
2262 else
2263 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
2264 }
2265 }
2266 #endif
2267
2268 sc->sc_naddrs6++;
2269 if (own)
2270 sc->sc_advskew = 0;
2271 carp_sc_state(sc);
2272 carp_setrun(sc, 0);
2273
2274 return (0);
2275
2276 cleanup:
2277 /* clean up multicast memberships */
2278 if (!sc->sc_naddrs6) {
2279 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
2280 imm = LIST_FIRST(&im6o->im6o_memberships);
2281 LIST_REMOVE(imm, i6mm_chain);
2282 in6_leavegroup(imm);
2283 }
2284 }
2285 return (error);
2286 }
2287
2288 static int
2289 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
2290 {
2291 int error = 0;
2292
2293 if (!--sc->sc_naddrs6) {
2294 struct carp_if *cif = sc->sc_carpdev->if_carp;
2295 struct ip6_moptions *im6o = &sc->sc_im6o;
2296
2297 callout_stop(&sc->sc_ad_tmo);
2298 sc->sc_vhid = -1;
2299 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
2300 struct in6_multi_mship *imm =
2301 LIST_FIRST(&im6o->im6o_memberships);
2302
2303 LIST_REMOVE(imm, i6mm_chain);
2304 in6_leavegroup(imm);
2305 }
2306 im6o->im6o_multicast_ifp = NULL;
2307 #ifdef foo
2308 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
2309 if (TAILQ_EMPTY(&cif->vhif_vrs)) {
2310 sc->sc_carpdev->if_carp = NULL;
2311 kfree(cif, M_IFADDR);
2312 }
2313 #endif
2314 }
2315 return (error);
2316 }
2317 #endif /* INET6 */
2318
2319 #endif
2320
2321 static int
2322 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr, struct ucred *cr)
2323 {
2324 struct carp_softc *sc = ifp->if_softc;
2325 struct ifreq *ifr = (struct ifreq *)addr;
2326 struct ifdrv *ifd = (struct ifdrv *)addr;
2327 int error = 0;
2328
2329 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2330
2331 switch (cmd) {
2332 case SIOCSIFFLAGS:
2333 if (ifp->if_flags & IFF_UP) {
2334 if ((ifp->if_flags & IFF_RUNNING) == 0)
2335 carp_init(sc);
2336 } else if (ifp->if_flags & IFF_RUNNING) {
2337 carp_ioctl_stop(sc);
2338 }
2339 break;
2340
2341 case SIOCSIFCAP:
2342 carp_ioctl_ifcap(sc, ifr->ifr_reqcap);
2343 break;
2344
2345 case SIOCSVH:
2346 error = carp_ioctl_setvh(sc, ifr->ifr_data, cr);
2347 break;
2348
2349 case SIOCGVH:
2350 error = carp_ioctl_getvh(sc, ifr->ifr_data, cr);
2351 break;
2352
2353 case SIOCGDRVSPEC:
2354 switch (ifd->ifd_cmd) {
2355 case CARPGDEVNAME:
2356 error = carp_ioctl_getdevname(sc, ifd);
2357 break;
2358
2359 case CARPGVHADDR:
2360 error = carp_ioctl_getvhaddr(sc, ifd);
2361 break;
2362
2363 default:
2364 error = EINVAL;
2365 break;
2366 }
2367 break;
2368
2369 default:
2370 error = ether_ioctl(ifp, cmd, addr);
2371 break;
2372 }
2373
2374 return error;
2375 }
2376
2377 static void
2378 carp_ioctl_stop_dispatch(netmsg_t msg)
2379 {
2380 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2381 struct carp_softc *sc = cmsg->nc_softc;
2382
2383 carp_stop(sc, FALSE);
2384 lwkt_replymsg(&cmsg->base.lmsg, 0);
2385 }
2386
2387 static void
2388 carp_ioctl_stop(struct carp_softc *sc)
2389 {
2390 struct ifnet *ifp = &sc->arpcom.ac_if;
2391 struct netmsg_carp cmsg;
2392
2393 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2394
2395 ifnet_deserialize_all(ifp);
2396
2397 bzero(&cmsg, sizeof(cmsg));
2398 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2399 carp_ioctl_stop_dispatch);
2400 cmsg.nc_softc = sc;
2401
2402 lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2403
2404 ifnet_serialize_all(ifp);
2405 }
2406
2407 static void
2408 carp_ioctl_setvh_dispatch(netmsg_t msg)
2409 {
2410 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2411 struct carp_softc *sc = cmsg->nc_softc;
2412 struct ifnet *ifp = &sc->arpcom.ac_if;
2413 const struct carpreq *carpr = cmsg->nc_data;
2414 int error;
2415
2416 error = 1;
2417 if ((ifp->if_flags & IFF_RUNNING) &&
2418 sc->sc_state != INIT && carpr->carpr_state != sc->sc_state) {
2419 switch (carpr->carpr_state) {
2420 case BACKUP:
2421 callout_stop(&sc->sc_ad_tmo);
2422 carp_set_state(sc, BACKUP);
2423 carp_setrun(sc, 0);
2424 if (carp_opts[CARPCTL_SETROUTE])
2425 carp_setroute(sc, RTM_DELETE);
2426 break;
2427
2428 case MASTER:
2429 carp_master_down(sc);
2430 break;
2431
2432 default:
2433 break;
2434 }
2435 }
2436 if (carpr->carpr_vhid > 0) {
2437 if (carpr->carpr_vhid > 255) {
2438 error = EINVAL;
2439 goto back;
2440 }
2441 if (sc->sc_carpdev) {
2442 struct carp_if *cif = sc->sc_carpdev->if_carp;
2443 struct carp_softc_container *scc;
2444
2445 TAILQ_FOREACH(scc, cif, scc_link) {
2446 struct carp_softc *vr = scc->scc_softc;
2447
2448 if (vr != sc &&
2449 vr->sc_vhid == carpr->carpr_vhid) {
2450 error = EEXIST;
2451 goto back;
2452 }
2453 }
2454 }
2455 sc->sc_vhid = carpr->carpr_vhid;
2456
2457 IF_LLADDR(ifp)[5] = sc->sc_vhid;
2458 bcopy(IF_LLADDR(ifp), sc->arpcom.ac_enaddr,
2459 ETHER_ADDR_LEN);
2460
2461 error--;
2462 }
2463 if (carpr->carpr_advbase > 0 || carpr->carpr_advskew > 0) {
2464 if (carpr->carpr_advskew >= 255) {
2465 error = EINVAL;
2466 goto back;
2467 }
2468 if (carpr->carpr_advbase > 255) {
2469 error = EINVAL;
2470 goto back;
2471 }
2472 sc->sc_advbase = carpr->carpr_advbase;
2473 sc->sc_advskew = carpr->carpr_advskew;
2474 error--;
2475 }
2476 bcopy(carpr->carpr_key, sc->sc_key, sizeof(sc->sc_key));
2477 if (error > 0) {
2478 error = EINVAL;
2479 } else {
2480 error = 0;
2481 carp_setrun(sc, 0);
2482 }
2483 back:
2484 carp_hmac_prepare(sc);
2485
2486 lwkt_replymsg(&cmsg->base.lmsg, error);
2487 }
2488
2489 static int
2490 carp_ioctl_setvh(struct carp_softc *sc, void *udata, struct ucred *cr)
2491 {
2492 struct ifnet *ifp = &sc->arpcom.ac_if;
2493 struct netmsg_carp cmsg;
2494 struct carpreq carpr;
2495 int error;
2496
2497 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2498 ifnet_deserialize_all(ifp);
2499
2500 error = caps_priv_check(cr, SYSCAP_RESTRICTEDROOT |
2501 __SYSCAP_NULLCRED);
2502 if (error)
2503 goto back;
2504
2505 error = copyin(udata, &carpr, sizeof(carpr));
2506 if (error)
2507 goto back;
2508
2509 bzero(&cmsg, sizeof(cmsg));
2510 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2511 carp_ioctl_setvh_dispatch);
2512 cmsg.nc_softc = sc;
2513 cmsg.nc_data = &carpr;
2514
2515 error = lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2516
2517 back:
2518 ifnet_serialize_all(ifp);
2519 return error;
2520 }
2521
2522 static void
2523 carp_ioctl_ifcap_dispatch(netmsg_t msg)
2524 {
2525 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2526 struct carp_softc *sc = cmsg->nc_softc;
2527 struct ifnet *ifp = &sc->arpcom.ac_if;
2528 int reqcap = *((const int *)(cmsg->nc_data));
2529 int mask;
2530
2531 mask = reqcap ^ ifp->if_capenable;
2532 if (mask & IFCAP_TXCSUM) {
2533 ifp->if_capenable ^= IFCAP_TXCSUM;
2534 if ((ifp->if_capenable & IFCAP_TXCSUM) &&
2535 sc->sc_carpdev != NULL) {
2536 ifp->if_hwassist |=
2537 (sc->sc_carpdev->if_hwassist &
2538 (CSUM_IP | CSUM_UDP | CSUM_TCP));
2539 } else {
2540 ifp->if_hwassist &= ~(CSUM_IP | CSUM_UDP | CSUM_TCP);
2541 }
2542 }
2543 if (mask & IFCAP_TSO) {
2544 ifp->if_capenable ^= IFCAP_TSO;
2545 if ((ifp->if_capenable & IFCAP_TSO) &&
2546 sc->sc_carpdev != NULL) {
2547 ifp->if_hwassist |=
2548 (sc->sc_carpdev->if_hwassist & CSUM_TSO);
2549 } else {
2550 ifp->if_hwassist &= ~CSUM_TSO;
2551 }
2552 }
2553
2554 lwkt_replymsg(&cmsg->base.lmsg, 0);
2555 }
2556
2557 static void
2558 carp_ioctl_ifcap(struct carp_softc *sc, int reqcap)
2559 {
2560 struct ifnet *ifp = &sc->arpcom.ac_if;
2561 struct netmsg_carp cmsg;
2562
2563 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2564 ifnet_deserialize_all(ifp);
2565
2566 bzero(&cmsg, sizeof(cmsg));
2567 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2568 carp_ioctl_ifcap_dispatch);
2569 cmsg.nc_softc = sc;
2570 cmsg.nc_data = &reqcap;
2571
2572 lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2573
2574 ifnet_serialize_all(ifp);
2575 }
2576
2577 static void
2578 carp_ioctl_getvh_dispatch(netmsg_t msg)
2579 {
2580 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2581 struct carp_softc *sc = cmsg->nc_softc;
2582 struct carpreq *carpr = cmsg->nc_data;
2583
2584 carpr->carpr_state = sc->sc_state;
2585 carpr->carpr_vhid = sc->sc_vhid;
2586 carpr->carpr_advbase = sc->sc_advbase;
2587 carpr->carpr_advskew = sc->sc_advskew;
2588 bcopy(sc->sc_key, carpr->carpr_key, sizeof(carpr->carpr_key));
2589
2590 lwkt_replymsg(&cmsg->base.lmsg, 0);
2591 }
2592
2593 static int
2594 carp_ioctl_getvh(struct carp_softc *sc, void *udata, struct ucred *cr)
2595 {
2596 struct ifnet *ifp = &sc->arpcom.ac_if;
2597 struct netmsg_carp cmsg;
2598 struct carpreq carpr;
2599 int error;
2600
2601 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2602 ifnet_deserialize_all(ifp);
2603
2604 bzero(&cmsg, sizeof(cmsg));
2605 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2606 carp_ioctl_getvh_dispatch);
2607 cmsg.nc_softc = sc;
2608 cmsg.nc_data = &carpr;
2609
2610 lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2611
2612 error = caps_priv_check(cr, SYSCAP_RESTRICTEDROOT |
2613 __SYSCAP_NULLCRED);
2614 if (error)
2615 bzero(carpr.carpr_key, sizeof(carpr.carpr_key));
2616
2617 error = copyout(&carpr, udata, sizeof(carpr));
2618
2619 ifnet_serialize_all(ifp);
2620 return error;
2621 }
2622
2623 static void
2624 carp_ioctl_getdevname_dispatch(netmsg_t msg)
2625 {
2626 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2627 struct carp_softc *sc = cmsg->nc_softc;
2628 char *devname = cmsg->nc_data;
2629
2630 bzero(devname, IFNAMSIZ);
2631 if (sc->sc_carpdev != NULL)
2632 strlcpy(devname, sc->sc_carpdev->if_xname, IFNAMSIZ);
2633
2634 lwkt_replymsg(&cmsg->base.lmsg, 0);
2635 }
2636
2637 static int
2638 carp_ioctl_getdevname(struct carp_softc *sc, struct ifdrv *ifd)
2639 {
2640 struct ifnet *ifp = &sc->arpcom.ac_if;
2641 struct netmsg_carp cmsg;
2642 char devname[IFNAMSIZ];
2643 int error;
2644
2645 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2646
2647 if (ifd->ifd_len != sizeof(devname))
2648 return EINVAL;
2649
2650 ifnet_deserialize_all(ifp);
2651
2652 bzero(&cmsg, sizeof(cmsg));
2653 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2654 carp_ioctl_getdevname_dispatch);
2655 cmsg.nc_softc = sc;
2656 cmsg.nc_data = devname;
2657
2658 lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2659
2660 error = copyout(devname, ifd->ifd_data, sizeof(devname));
2661
2662 ifnet_serialize_all(ifp);
2663 return error;
2664 }
2665
2666 static void
2667 carp_init_dispatch(netmsg_t msg)
2668 {
2669 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2670 struct carp_softc *sc = cmsg->nc_softc;
2671
2672 sc->sc_if.if_flags |= IFF_RUNNING;
2673 carp_hmac_prepare(sc);
2674 carp_set_state(sc, INIT);
2675 carp_setrun(sc, 0);
2676
2677 lwkt_replymsg(&cmsg->base.lmsg, 0);
2678 }
2679
2680 static void
2681 carp_init(void *xsc)
2682 {
2683 struct carp_softc *sc = xsc;
2684 struct ifnet *ifp = &sc->arpcom.ac_if;
2685 struct netmsg_carp cmsg;
2686
2687 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2688
2689 ifnet_deserialize_all(ifp);
2690
2691 bzero(&cmsg, sizeof(cmsg));
2692 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2693 carp_init_dispatch);
2694 cmsg.nc_softc = sc;
2695
2696 lwkt_domsg(netisr_cpuport(0), &cmsg.base.lmsg, 0);
2697
2698 ifnet_serialize_all(ifp);
2699 }
2700
2701 static int
2702 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
2703 struct rtentry *rt)
2704 {
2705 struct carp_softc *sc = ifp->if_softc;
2706 struct ifnet *carpdev;
2707 int error = 0;
2708
2709 carpdev = sc->sc_carpdev;
2710 if (carpdev != NULL) {
2711 if (m->m_flags & M_MCAST)
2712 IFNET_STAT_INC(ifp, omcasts, 1);
2713 IFNET_STAT_INC(ifp, obytes, m->m_pkthdr.len + ETHER_HDR_LEN);
2714 IFNET_STAT_INC(ifp, opackets, 1);
2715
2716 /*
2717 * NOTE:
2718 * CARP's ifp is passed to backing device's
2719 * if_output method.
2720 */
2721 carpdev->if_output(ifp, m, dst, rt);
2722 } else {
2723 IFNET_STAT_INC(ifp, oerrors, 1);
2724 m_freem(m);
2725 error = ENETUNREACH;
2726 }
2727 return error;
2728 }
2729
2730 /*
2731 * Start output on carp interface. This function should never be called.
2732 */
2733 static void
2734 carp_start(struct ifnet *ifp, struct ifaltq_subque *ifsq __unused)
2735 {
2736 panic("%s: start called", ifp->if_xname);
2737 }
2738
2739 static void
2740 carp_set_state(struct carp_softc *sc, int state)
2741 {
2742 struct ifnet *cifp = &sc->sc_if;
2743
2744 if (sc->sc_state == state)
2745 return;
2746 sc->sc_state = state;
2747
2748 switch (sc->sc_state) {
2749 case BACKUP:
2750 cifp->if_link_state = LINK_STATE_DOWN;
2751 break;
2752
2753 case MASTER:
2754 cifp->if_link_state = LINK_STATE_UP;
2755 break;
2756
2757 default:
2758 cifp->if_link_state = LINK_STATE_UNKNOWN;
2759 break;
2760 }
2761 rt_ifmsg(cifp);
2762 }
2763
2764 void
2765 carp_group_demote_adj(struct ifnet *ifp, int adj)
2766 {
2767 struct ifg_list *ifgl;
2768 int *dm;
2769
2770 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) {
2771 if (!strcmp(ifgl->ifgl_group->ifg_group, IFG_ALL))
2772 continue;
2773 dm = &ifgl->ifgl_group->ifg_carp_demoted;
2774
2775 if (*dm + adj >= 0)
2776 *dm += adj;
2777 else
2778 *dm = 0;
2779
2780 if (adj > 0 && *dm == 1)
2781 carp_send_ad_all();
2782 CARP_LOG("%s demoted group %s to %d", ifp->if_xname,
2783 ifgl->ifgl_group->ifg_group, *dm);
2784 }
2785 }
2786
2787 #ifdef foo
2788 void
2789 carp_carpdev_state(void *v)
2790 {
2791 struct carp_if *cif = v;
2792 struct carp_softc *sc;
2793
2794 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
2795 carp_sc_state(sc);
2796 }
2797
2798 static void
2799 carp_sc_state(struct carp_softc *sc)
2800 {
2801 if (!(sc->sc_carpdev->if_flags & IFF_UP)) {
2802 callout_stop(&sc->sc_ad_tmo);
2803 callout_stop(&sc->sc_md_tmo);
2804 callout_stop(&sc->sc_md6_tmo);
2805 carp_set_state(sc, INIT);
2806 carp_setrun(sc, 0);
2807 if (!sc->sc_suppress) {
2808 carp_suppress_preempt++;
2809 if (carp_suppress_preempt == 1)
2810 carp_send_ad_all();
2811 }
2812 sc->sc_suppress = 1;
2813 } else {
2814 carp_set_state(sc, INIT);
2815 carp_setrun(sc, 0);
2816 if (sc->sc_suppress)
2817 carp_suppress_preempt--;
2818 sc->sc_suppress = 0;
2819 }
2820 }
2821 #endif
2822
2823 static void
2824 carp_stop(struct carp_softc *sc, boolean_t detach)
2825 {
2826 sc->sc_if.if_flags &= ~IFF_RUNNING;
2827
2828 callout_stop(&sc->sc_ad_tmo);
2829 callout_stop(&sc->sc_md_tmo);
2830 callout_stop(&sc->sc_md6_tmo);
2831
2832 if (!detach && sc->sc_state == MASTER)
2833 carp_send_ad(sc);
2834
2835 if (sc->sc_suppress)
2836 carp_suppress_preempt--;
2837 sc->sc_suppress = 0;
2838
2839 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
2840 carp_suppress_preempt--;
2841 sc->sc_sendad_errors = 0;
2842 sc->sc_sendad_success = 0;
2843
2844 carp_set_state(sc, INIT);
2845 carp_setrun(sc, 0);
2846 }
2847
2848 static void
2849 carp_suspend(struct carp_softc *sc, boolean_t detach)
2850 {
2851 struct ifnet *cifp = &sc->sc_if;
2852
2853 carp_stop(sc, detach);
2854
2855 /* Retain the running state, if we are not dead yet */
2856 if (!sc->sc_dead && (cifp->if_flags & IFF_UP))
2857 cifp->if_flags |= IFF_RUNNING;
2858 }
2859
2860 static int
2861 carp_activate_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
2862 struct ifnet *ifp, struct in_ifaddr *ia_if, int own)
2863 {
2864 struct ip_moptions *imo = &sc->sc_imo;
2865 struct carp_if *ocif = ifp->if_carp;
2866 int error;
2867
2868 KKASSERT(vha->vha_ia != NULL);
2869
2870 KASSERT(ia_if != NULL, ("NULL backing address"));
2871 KASSERT(vha->vha_iaback == NULL, ("%p is already activated", vha));
2872 KASSERT((vha->vha_flags & CARP_VHAF_OWNER) == 0,
2873 ("inactive vhaddr %p is the address owner", vha));
2874
2875 KASSERT(sc->sc_carpdev == NULL || sc->sc_carpdev == ifp,
2876 ("%s is already on %s", sc->sc_if.if_xname,
2877 sc->sc_carpdev->if_xname));
2878
2879 if (ocif == NULL) {
2880 KASSERT(sc->sc_carpdev == NULL,
2881 ("%s is already on %s", sc->sc_if.if_xname,
2882 sc->sc_carpdev->if_xname));
2883
2884 error = ifpromisc(ifp, 1);
2885 if (error)
2886 return error;
2887 } else {
2888 struct carp_softc_container *scc;
2889
2890 TAILQ_FOREACH(scc, ocif, scc_link) {
2891 struct carp_softc *vr = scc->scc_softc;
2892
2893 if (vr != sc && vr->sc_vhid == sc->sc_vhid)
2894 return EINVAL;
2895 }
2896 }
2897
2898 ifp->if_carp = carp_if_insert(ocif, sc);
2899 KASSERT(ifp->if_carp != NULL, ("%s carp_if_insert failed", __func__));
2900
2901 sc->sc_ia = ia_if;
2902 sc->sc_carpdev = ifp;
2903 sc->arpcom.ac_if.if_hwassist = 0;
2904 if (sc->arpcom.ac_if.if_capenable & IFCAP_TXCSUM) {
2905 sc->arpcom.ac_if.if_hwassist |=
2906 (ifp->if_hwassist & (CSUM_IP | CSUM_UDP | CSUM_TCP));
2907 }
2908 if (sc->arpcom.ac_if.if_capenable & IFCAP_TSO)
2909 sc->arpcom.ac_if.if_hwassist |= (ifp->if_hwassist & CSUM_TSO);
2910
2911 /*
2912 * Make sure that all protocol threads see the sc_carpdev and
2913 * if_carp changes
2914 */
2915 netmsg_service_sync();
2916
2917 if (ocif != NULL && ifp->if_carp != ocif) {
2918 /*
2919 * The old carp list could be safely free now,
2920 * since no one can access it.
2921 */
2922 carp_if_free(ocif);
2923 }
2924
2925 vha->vha_iaback = ia_if;
2926 sc->sc_naddrs++;
2927
2928 if (own) {
2929 vha->vha_flags |= CARP_VHAF_OWNER;
2930
2931 /* XXX save user configured advskew? */
2932 sc->sc_advskew = 0;
2933 }
2934
2935 carp_addroute_vhaddr(sc, vha);
2936
2937 /*
2938 * Join the multicast group only after the backing interface
2939 * has been hooked with the CARP interface.
2940 */
2941 KASSERT(imo->imo_multicast_ifp == NULL ||
2942 imo->imo_multicast_ifp == &sc->sc_if,
2943 ("%s didn't leave mcast group on %s",
2944 sc->sc_if.if_xname, imo->imo_multicast_ifp->if_xname));
2945
2946 if (imo->imo_num_memberships == 0) {
2947 struct in_addr addr;
2948
2949 addr.s_addr = htonl(INADDR_CARP_GROUP);
2950 imo->imo_membership[0] = in_addmulti(&addr, &sc->sc_if);
2951 if (imo->imo_membership[0] == NULL) {
2952 carp_deactivate_vhaddr(sc, vha, FALSE);
2953 return ENOBUFS;
2954 }
2955
2956 imo->imo_num_memberships++;
2957 imo->imo_multicast_ifp = &sc->sc_if;
2958 imo->imo_multicast_ttl = CARP_DFLTTL;
2959 imo->imo_multicast_loop = 0;
2960 }
2961
2962 carp_hmac_prepare(sc);
2963 carp_set_state(sc, INIT);
2964 carp_setrun(sc, 0);
2965 return 0;
2966 }
2967
2968 static void
2969 carp_deactivate_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
2970 boolean_t del_iaback)
2971 {
2972 KKASSERT(vha->vha_ia != NULL);
2973
2974 carp_hmac_prepare(sc);
2975
2976 if (vha->vha_iaback == NULL) {
2977 KASSERT((vha->vha_flags & CARP_VHAF_OWNER) == 0,
2978 ("inactive vhaddr %p is the address owner", vha));
2979 return;
2980 }
2981
2982 vha->vha_flags &= ~CARP_VHAF_OWNER;
2983 carp_delroute_vhaddr(sc, vha, del_iaback);
2984
2985 KKASSERT(sc->sc_naddrs > 0);
2986 vha->vha_iaback = NULL;
2987 sc->sc_naddrs--;
2988 if (!sc->sc_naddrs) {
2989 if (sc->sc_naddrs6) {
2990 carp_multicast_cleanup(sc);
2991 sc->sc_ia = NULL;
2992 } else {
2993 carp_detach(sc, FALSE, del_iaback);
2994 }
2995 }
2996 }
2997
2998 static void
2999 carp_link_addrs(struct carp_softc *sc, struct ifnet *ifp, struct ifaddr *ifa_if)
3000 {
3001 struct carp_vhaddr *vha;
3002 struct in_ifaddr *ia_if;
3003
3004 KKASSERT(ifa_if->ifa_addr->sa_family == AF_INET);
3005 ia_if = ifatoia(ifa_if);
3006
3007 /*
3008 * Test each inactive vhaddr against the newly added address.
3009 * If the newly added address could be the backing address,
3010 * then activate the matching vhaddr.
3011 */
3012 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
3013 const struct in_ifaddr *ia;
3014 int own;
3015
3016 if (vha->vha_iaback != NULL)
3017 continue;
3018
3019 ia = vha->vha_ia;
3020 if (ia->ia_subnetmask != ia_if->ia_subnetmask ||
3021 ia->ia_subnet != ia_if->ia_subnet)
3022 continue;
3023
3024 own = 0;
3025 if (ia->ia_addr.sin_addr.s_addr ==
3026 ia_if->ia_addr.sin_addr.s_addr)
3027 own = 1;
3028
3029 carp_activate_vhaddr(sc, vha, ifp, ia_if, own);
3030 }
3031 }
3032
3033 static void
3034 carp_unlink_addrs(struct carp_softc *sc, struct ifnet *ifp,
3035 struct ifaddr *ifa_if)
3036 {
3037 struct carp_vhaddr *vha;
3038 struct in_ifaddr *ia_if;
3039
3040 KKASSERT(ifa_if->ifa_addr->sa_family == AF_INET);
3041 ia_if = ifatoia(ifa_if);
3042
3043 /*
3044 * Ad src address is deleted; set it to NULL.
3045 * Following loop will try pick up a new ad src address
3046 * if one of the vhaddr could retain its backing address.
3047 */
3048 if (sc->sc_ia == ia_if)
3049 sc->sc_ia = NULL;
3050
3051 /*
3052 * Test each active vhaddr against the deleted address.
3053 * If the deleted address is vhaddr address's backing
3054 * address, then deactivate the vhaddr.
3055 */
3056 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
3057 if (vha->vha_iaback == NULL)
3058 continue;
3059
3060 if (vha->vha_iaback == ia_if)
3061 carp_deactivate_vhaddr(sc, vha, TRUE);
3062 else if (sc->sc_ia == NULL)
3063 sc->sc_ia = vha->vha_iaback;
3064 }
3065 }
3066
3067 static void
3068 carp_update_addrs(struct carp_softc *sc, struct ifaddr *ifa_del)
3069 {
3070 struct carp_vhaddr *vha;
3071
3072 KKASSERT(sc->sc_carpdev == NULL);
3073
3074 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
3075 carp_config_vhaddr(sc, vha, ifatoia(ifa_del));
3076 }
3077
3078 static void
3079 carp_ifaddr(void *arg __unused, struct ifnet *ifp,
3080 enum ifaddr_event event, struct ifaddr *ifa)
3081 {
3082 struct carp_softc *sc;
3083
3084 if (ifa->ifa_addr->sa_family != AF_INET)
3085 return;
3086
3087 ASSERT_NETISR0;
3088
3089 if (ifp->if_type == IFT_CARP) {
3090 /*
3091 * Address is changed on carp(4) interface
3092 */
3093 switch (event) {
3094 case IFADDR_EVENT_ADD:
3095 carp_add_addr(ifp->if_softc, ifa);
3096 break;
3097
3098 case IFADDR_EVENT_CHANGE:
3099 carp_config_addr(ifp->if_softc, ifa);
3100 break;
3101
3102 case IFADDR_EVENT_DELETE:
3103 carp_del_addr(ifp->if_softc, ifa);
3104 break;
3105 }
3106 return;
3107 }
3108
3109 /*
3110 * Address is changed on non-carp(4) interface
3111 */
3112 if ((ifp->if_flags & IFF_MULTICAST) == 0)
3113 return;
3114
3115 LIST_FOREACH(sc, &carpif_list, sc_next) {
3116 if (sc->sc_carpdev != NULL && sc->sc_carpdev != ifp) {
3117 /* Not the parent iface; skip */
3118 continue;
3119 }
3120
3121 switch (event) {
3122 case IFADDR_EVENT_ADD:
3123 carp_link_addrs(sc, ifp, ifa);
3124 break;
3125
3126 case IFADDR_EVENT_DELETE:
3127 if (sc->sc_carpdev != NULL) {
3128 carp_unlink_addrs(sc, ifp, ifa);
3129 if (sc->sc_carpdev == NULL) {
3130 /*
3131 * We no longer have the parent
3132 * interface, however, certain
3133 * virtual addresses, which are
3134 * not used because they can't
3135 * match the previous parent
3136 * interface's addresses, may now
3137 * match different interface's
3138 * addresses.
3139 */
3140 carp_update_addrs(sc, ifa);
3141 }
3142 } else {
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 unlinked.
3148 */
3149 }
3150 break;
3151
3152 case IFADDR_EVENT_CHANGE:
3153 if (sc->sc_carpdev == NULL) {
3154 /*
3155 * The carp(4) interface didn't have a
3156 * parent iface, so it is not possible
3157 * that it will contain any address to
3158 * be updated.
3159 */
3160 carp_link_addrs(sc, ifp, ifa);
3161 } else {
3162 /*
3163 * First try breaking tie with the old
3164 * address. Then see whether we could
3165 * link certain vhaddr to the new address.
3166 * If that fails, i.e. carpdev is NULL,
3167 * we try a global update.
3168 *
3169 * NOTE: The above order is critical.
3170 */
3171 carp_unlink_addrs(sc, ifp, ifa);
3172 carp_link_addrs(sc, ifp, ifa);
3173 if (sc->sc_carpdev == NULL) {
3174 /*
3175 * See the comment in the above
3176 * IFADDR_EVENT_DELETE block.
3177 */
3178 carp_update_addrs(sc, NULL);
3179 }
3180 }
3181 break;
3182 }
3183 }
3184 }
3185
3186 void
3187 carp_proto_ctlinput(netmsg_t msg)
3188 {
3189 int cmd = msg->ctlinput.nm_cmd;
3190 struct sockaddr *sa = msg->ctlinput.nm_arg;
3191 struct in_ifaddr_container *iac;
3192
3193 /* We only process PRC_IFDOWN and PRC_IFUP commands */
3194 if (cmd != PRC_IFDOWN && cmd != PRC_IFUP)
3195 goto done;
3196
3197 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
3198 struct in_ifaddr *ia = iac->ia;
3199 struct ifnet *ifp = ia->ia_ifp;
3200
3201 if (ifp->if_type == IFT_CARP)
3202 continue;
3203
3204 if (ia->ia_ifa.ifa_addr == sa) {
3205 if (cmd == PRC_IFDOWN) {
3206 carp_ifaddr(NULL, ifp, IFADDR_EVENT_DELETE,
3207 &ia->ia_ifa);
3208 } else if (cmd == PRC_IFUP) {
3209 carp_ifaddr(NULL, ifp, IFADDR_EVENT_ADD,
3210 &ia->ia_ifa);
3211 }
3212 break;
3213 }
3214 }
3215 done:
3216 lwkt_replymsg(&msg->lmsg, 0);
3217 }
3218
3219 struct ifnet *
3220 carp_parent(struct ifnet *cifp)
3221 {
3222 struct carp_softc *sc;
3223
3224 KKASSERT(cifp->if_type == IFT_CARP);
3225 sc = cifp->if_softc;
3226
3227 return sc->sc_carpdev;
3228 }
3229
3230 #define rtinitflags(x) \
3231 (((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) \
3232 ? RTF_HOST : 0)
3233
3234 static int
3235 carp_addroute_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha)
3236 {
3237 struct in_ifaddr *ia, *iaback;
3238
3239 if (sc->sc_state != MASTER)
3240 return 0;
3241
3242 ia = vha->vha_ia;
3243 KKASSERT(ia != NULL);
3244
3245 iaback = vha->vha_iaback;
3246 KKASSERT(iaback != NULL);
3247
3248 return rtchange(&iaback->ia_ifa, &ia->ia_ifa);
3249 }
3250
3251 static void
3252 carp_delroute_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
3253 boolean_t del_iaback)
3254 {
3255 struct in_ifaddr *ia, *iaback;
3256
3257 ia = vha->vha_ia;
3258 KKASSERT(ia != NULL);
3259
3260 iaback = vha->vha_iaback;
3261 KKASSERT(iaback != NULL);
3262
3263 if (!del_iaback && (iaback->ia_ifp->if_flags & IFF_UP)) {
3264 rtchange(&ia->ia_ifa, &iaback->ia_ifa);
3265 return;
3266 }
3267
3268 rtinit(&ia->ia_ifa, RTM_DELETE, rtinitflags(ia));
3269 in_ifadown_force(&ia->ia_ifa, 1);
3270 ia->ia_flags &= ~IFA_ROUTE;
3271 }
3272
3273 static int
3274 carp_modevent(module_t mod, int type, void *data)
3275 {
3276 switch (type) {
3277 case MOD_LOAD:
3278 LIST_INIT(&carpif_list);
3279 carp_ifdetach_event =
3280 EVENTHANDLER_REGISTER(ifnet_detach_event, carp_ifdetach, NULL,
3281 EVENTHANDLER_PRI_ANY);
3282 carp_ifaddr_event =
3283 EVENTHANDLER_REGISTER(ifaddr_event, carp_ifaddr, NULL,
3284 EVENTHANDLER_PRI_FIRST);
3285 if_clone_attach(&carp_cloner);
3286 break;
3287
3288 case MOD_UNLOAD:
3289 EVENTHANDLER_DEREGISTER(ifnet_detach_event,
3290 carp_ifdetach_event);
3291 EVENTHANDLER_DEREGISTER(ifaddr_event,
3292 carp_ifaddr_event);
3293 if_clone_detach(&carp_cloner);
3294 break;
3295
3296 default:
3297 return (EINVAL);
3298 }
3299 return (0);
3300 }
3301
3302 static moduledata_t carp_mod = {
3303 "carp",
3304 carp_modevent,
3305 0
3306 };
3307 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
DragonFly BSD