FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_carp.c
1 /*-
2 * Copyright (c) 2002 Michael Shalayeff.
3 * Copyright (c) 2003 Ryan McBride.
4 * Copyright (c) 2011 Gleb Smirnoff <glebius@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
25 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
26 * THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: releng/10.0/sys/netinet/ip_carp.c 255397 2013-09-08 18:19:40Z trociny $");
31
32 #include "opt_bpf.h"
33 #include "opt_inet.h"
34 #include "opt_inet6.h"
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/bus.h>
39 #include <sys/jail.h>
40 #include <sys/kernel.h>
41 #include <sys/limits.h>
42 #include <sys/malloc.h>
43 #include <sys/mbuf.h>
44 #include <sys/module.h>
45 #include <sys/priv.h>
46 #include <sys/proc.h>
47 #include <sys/protosw.h>
48 #include <sys/socket.h>
49 #include <sys/sockio.h>
50 #include <sys/sysctl.h>
51 #include <sys/syslog.h>
52 #include <sys/taskqueue.h>
53 #include <sys/counter.h>
54
55 #include <net/ethernet.h>
56 #include <net/fddi.h>
57 #include <net/if.h>
58 #include <net/if_dl.h>
59 #include <net/if_llatbl.h>
60 #include <net/if_types.h>
61 #include <net/iso88025.h>
62 #include <net/route.h>
63 #include <net/vnet.h>
64
65 #if defined(INET) || defined(INET6)
66 #include <netinet/in.h>
67 #include <netinet/in_var.h>
68 #include <netinet/ip_carp.h>
69 #include <netinet/ip.h>
70 #include <machine/in_cksum.h>
71 #endif
72 #ifdef INET
73 #include <netinet/ip_var.h>
74 #include <netinet/if_ether.h>
75 #endif
76
77 #ifdef INET6
78 #include <netinet/icmp6.h>
79 #include <netinet/ip6.h>
80 #include <netinet6/ip6protosw.h>
81 #include <netinet6/in6_var.h>
82 #include <netinet6/ip6_var.h>
83 #include <netinet6/scope6_var.h>
84 #include <netinet6/nd6.h>
85 #endif
86
87 #include <crypto/sha1.h>
88
89 static MALLOC_DEFINE(M_CARP, "CARP", "CARP addresses");
90
91 struct carp_softc {
92 struct ifnet *sc_carpdev; /* Pointer to parent ifnet. */
93 struct ifaddr **sc_ifas; /* Our ifaddrs. */
94 struct sockaddr_dl sc_addr; /* Our link level address. */
95 struct callout sc_ad_tmo; /* Advertising timeout. */
96 #ifdef INET
97 struct callout sc_md_tmo; /* Master down timeout. */
98 #endif
99 #ifdef INET6
100 struct callout sc_md6_tmo; /* XXX: Master down timeout. */
101 #endif
102 struct mtx sc_mtx;
103
104 int sc_vhid;
105 int sc_advskew;
106 int sc_advbase;
107
108 int sc_naddrs;
109 int sc_naddrs6;
110 int sc_ifasiz;
111 enum { INIT = 0, BACKUP, MASTER } sc_state;
112 int sc_suppress;
113 int sc_sendad_errors;
114 #define CARP_SENDAD_MAX_ERRORS 3
115 int sc_sendad_success;
116 #define CARP_SENDAD_MIN_SUCCESS 3
117
118 int sc_init_counter;
119 uint64_t sc_counter;
120
121 /* authentication */
122 #define CARP_HMAC_PAD 64
123 unsigned char sc_key[CARP_KEY_LEN];
124 unsigned char sc_pad[CARP_HMAC_PAD];
125 SHA1_CTX sc_sha1;
126
127 TAILQ_ENTRY(carp_softc) sc_list; /* On the carp_if list. */
128 LIST_ENTRY(carp_softc) sc_next; /* On the global list. */
129 };
130
131 struct carp_if {
132 #ifdef INET
133 int cif_naddrs;
134 #endif
135 #ifdef INET6
136 int cif_naddrs6;
137 #endif
138 TAILQ_HEAD(, carp_softc) cif_vrs;
139 #ifdef INET
140 struct ip_moptions cif_imo;
141 #endif
142 #ifdef INET6
143 struct ip6_moptions cif_im6o;
144 #endif
145 struct ifnet *cif_ifp;
146 struct mtx cif_mtx;
147 };
148
149 #define CARP_INET 0
150 #define CARP_INET6 1
151 static int proto_reg[] = {-1, -1};
152
153 /*
154 * Brief design of carp(4).
155 *
156 * Any carp-capable ifnet may have a list of carp softcs hanging off
157 * its ifp->if_carp pointer. Each softc represents one unique virtual
158 * host id, or vhid. The softc has a back pointer to the ifnet. All
159 * softcs are joined in a global list, which has quite limited use.
160 *
161 * Any interface address that takes part in CARP negotiation has a
162 * pointer to the softc of its vhid, ifa->ifa_carp. That could be either
163 * AF_INET or AF_INET6 address.
164 *
165 * Although, one can get the softc's backpointer to ifnet and traverse
166 * through its ifp->if_addrhead queue to find all interface addresses
167 * involved in CARP, we keep a growable array of ifaddr pointers. This
168 * allows us to avoid grabbing the IF_ADDR_LOCK() in many traversals that
169 * do calls into the network stack, thus avoiding LORs.
170 *
171 * Locking:
172 *
173 * Each softc has a lock sc_mtx. It is used to synchronise carp_input_c(),
174 * callout-driven events and ioctl()s.
175 *
176 * To traverse the list of softcs on an ifnet we use CIF_LOCK(), to
177 * traverse the global list we use the mutex carp_mtx.
178 *
179 * Known issues with locking:
180 *
181 * - There is no protection for races between two ioctl() requests,
182 * neither SIOCSVH, nor SIOCAIFADDR & SIOCAIFADDR_IN6. I think that all
183 * interface ioctl()s should be serialized right in net/if.c.
184 * - Sending ad, we put the pointer to the softc in an mtag, and no reference
185 * counting is done on the softc.
186 * - On module unload we may race (?) with packet processing thread
187 * dereferencing our function pointers.
188 */
189
190 /* Accept incoming CARP packets. */
191 static VNET_DEFINE(int, carp_allow) = 1;
192 #define V_carp_allow VNET(carp_allow)
193
194 /* Preempt slower nodes. */
195 static VNET_DEFINE(int, carp_preempt) = 0;
196 #define V_carp_preempt VNET(carp_preempt)
197
198 /* Log level. */
199 static VNET_DEFINE(int, carp_log) = 1;
200 #define V_carp_log VNET(carp_log)
201
202 /* Global advskew demotion. */
203 static VNET_DEFINE(int, carp_demotion) = 0;
204 #define V_carp_demotion VNET(carp_demotion)
205
206 /* Send error demotion factor. */
207 static VNET_DEFINE(int, carp_senderr_adj) = CARP_MAXSKEW;
208 #define V_carp_senderr_adj VNET(carp_senderr_adj)
209
210 /* Iface down demotion factor. */
211 static VNET_DEFINE(int, carp_ifdown_adj) = CARP_MAXSKEW;
212 #define V_carp_ifdown_adj VNET(carp_ifdown_adj)
213
214 static int carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS);
215
216 SYSCTL_NODE(_net_inet, IPPROTO_CARP, carp, CTLFLAG_RW, 0, "CARP");
217 SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, allow, CTLFLAG_RW,
218 &VNET_NAME(carp_allow), 0, "Accept incoming CARP packets");
219 SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, preempt, CTLFLAG_RW,
220 &VNET_NAME(carp_preempt), 0, "High-priority backup preemption mode");
221 SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, log, CTLFLAG_RW,
222 &VNET_NAME(carp_log), 0, "CARP log level");
223 SYSCTL_VNET_PROC(_net_inet_carp, OID_AUTO, demotion, CTLTYPE_INT|CTLFLAG_RW,
224 0, 0, carp_demote_adj_sysctl, "I",
225 "Adjust demotion factor (skew of advskew)");
226 SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, senderr_demotion_factor, CTLFLAG_RW,
227 &VNET_NAME(carp_senderr_adj), 0, "Send error demotion factor adjustment");
228 SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, ifdown_demotion_factor, CTLFLAG_RW,
229 &VNET_NAME(carp_ifdown_adj), 0,
230 "Interface down demotion factor adjustment");
231
232 VNET_PCPUSTAT_DEFINE(struct carpstats, carpstats);
233 VNET_PCPUSTAT_SYSINIT(carpstats);
234 VNET_PCPUSTAT_SYSUNINIT(carpstats);
235
236 #define CARPSTATS_ADD(name, val) \
237 counter_u64_add(VNET(carpstats)[offsetof(struct carpstats, name) / \
238 sizeof(uint64_t)], (val))
239 #define CARPSTATS_INC(name) CARPSTATS_ADD(name, 1)
240
241 SYSCTL_VNET_PCPUSTAT(_net_inet_carp, OID_AUTO, stats, struct carpstats,
242 carpstats, "CARP statistics (struct carpstats, netinet/ip_carp.h)");
243
244 #define CARP_LOCK_INIT(sc) mtx_init(&(sc)->sc_mtx, "carp_softc", \
245 NULL, MTX_DEF)
246 #define CARP_LOCK_DESTROY(sc) mtx_destroy(&(sc)->sc_mtx)
247 #define CARP_LOCK_ASSERT(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED)
248 #define CARP_LOCK(sc) mtx_lock(&(sc)->sc_mtx)
249 #define CARP_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx)
250 #define CIF_LOCK_INIT(cif) mtx_init(&(cif)->cif_mtx, "carp_if", \
251 NULL, MTX_DEF)
252 #define CIF_LOCK_DESTROY(cif) mtx_destroy(&(cif)->cif_mtx)
253 #define CIF_LOCK_ASSERT(cif) mtx_assert(&(cif)->cif_mtx, MA_OWNED)
254 #define CIF_LOCK(cif) mtx_lock(&(cif)->cif_mtx)
255 #define CIF_UNLOCK(cif) mtx_unlock(&(cif)->cif_mtx)
256 #define CIF_FREE(cif) do { \
257 CIF_LOCK_ASSERT(cif); \
258 if (TAILQ_EMPTY(&(cif)->cif_vrs)) \
259 carp_free_if(cif); \
260 else \
261 CIF_UNLOCK(cif); \
262 } while (0)
263
264 #define CARP_LOG(...) do { \
265 if (V_carp_log > 0) \
266 log(LOG_INFO, "carp: " __VA_ARGS__); \
267 } while (0)
268
269 #define CARP_DEBUG(...) do { \
270 if (V_carp_log > 1) \
271 log(LOG_DEBUG, __VA_ARGS__); \
272 } while (0)
273
274 #define IFNET_FOREACH_IFA(ifp, ifa) \
275 IF_ADDR_LOCK_ASSERT(ifp); \
276 TAILQ_FOREACH((ifa), &(ifp)->if_addrhead, ifa_link) \
277 if ((ifa)->ifa_carp != NULL)
278
279 #define CARP_FOREACH_IFA(sc, ifa) \
280 CARP_LOCK_ASSERT(sc); \
281 for (int _i = 0; \
282 _i < (sc)->sc_naddrs + (sc)->sc_naddrs6 && \
283 ((ifa) = sc->sc_ifas[_i]) != NULL; \
284 ++_i)
285
286 #define IFNET_FOREACH_CARP(ifp, sc) \
287 CIF_LOCK_ASSERT(ifp->if_carp); \
288 TAILQ_FOREACH((sc), &(ifp)->if_carp->cif_vrs, sc_list)
289
290 #define DEMOTE_ADVSKEW(sc) \
291 (((sc)->sc_advskew + V_carp_demotion > CARP_MAXSKEW) ? \
292 CARP_MAXSKEW : ((sc)->sc_advskew + V_carp_demotion))
293
294 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t);
295 static struct carp_softc
296 *carp_alloc(struct ifnet *);
297 static void carp_detach_locked(struct ifaddr *);
298 static void carp_destroy(struct carp_softc *);
299 static struct carp_if
300 *carp_alloc_if(struct ifnet *);
301 static void carp_free_if(struct carp_if *);
302 static void carp_set_state(struct carp_softc *, int);
303 static void carp_sc_state(struct carp_softc *);
304 static void carp_setrun(struct carp_softc *, sa_family_t);
305 static void carp_master_down(void *);
306 static void carp_master_down_locked(struct carp_softc *);
307 static void carp_send_ad(void *);
308 static void carp_send_ad_locked(struct carp_softc *);
309 static void carp_addroute(struct carp_softc *);
310 static void carp_ifa_addroute(struct ifaddr *);
311 static void carp_delroute(struct carp_softc *);
312 static void carp_ifa_delroute(struct ifaddr *);
313 static void carp_send_ad_all(void *, int);
314 static void carp_demote_adj(int, char *);
315
316 static LIST_HEAD(, carp_softc) carp_list;
317 static struct mtx carp_mtx;
318 static struct task carp_sendall_task =
319 TASK_INITIALIZER(0, carp_send_ad_all, NULL);
320
321 static void
322 carp_hmac_prepare(struct carp_softc *sc)
323 {
324 uint8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
325 uint8_t vhid = sc->sc_vhid & 0xff;
326 struct ifaddr *ifa;
327 int i, found;
328 #ifdef INET
329 struct in_addr last, cur, in;
330 #endif
331 #ifdef INET6
332 struct in6_addr last6, cur6, in6;
333 #endif
334
335 CARP_LOCK_ASSERT(sc);
336
337 /* Compute ipad from key. */
338 bzero(sc->sc_pad, sizeof(sc->sc_pad));
339 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
340 for (i = 0; i < sizeof(sc->sc_pad); i++)
341 sc->sc_pad[i] ^= 0x36;
342
343 /* Precompute first part of inner hash. */
344 SHA1Init(&sc->sc_sha1);
345 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
346 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
347 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
348 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
349 #ifdef INET
350 cur.s_addr = 0;
351 do {
352 found = 0;
353 last = cur;
354 cur.s_addr = 0xffffffff;
355 CARP_FOREACH_IFA(sc, ifa) {
356 in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr;
357 if (ifa->ifa_addr->sa_family == AF_INET &&
358 ntohl(in.s_addr) > ntohl(last.s_addr) &&
359 ntohl(in.s_addr) < ntohl(cur.s_addr)) {
360 cur.s_addr = in.s_addr;
361 found++;
362 }
363 }
364 if (found)
365 SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur));
366 } while (found);
367 #endif /* INET */
368 #ifdef INET6
369 memset(&cur6, 0, sizeof(cur6));
370 do {
371 found = 0;
372 last6 = cur6;
373 memset(&cur6, 0xff, sizeof(cur6));
374 CARP_FOREACH_IFA(sc, ifa) {
375 in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
376 if (IN6_IS_SCOPE_EMBED(&in6))
377 in6.s6_addr16[1] = 0;
378 if (ifa->ifa_addr->sa_family == AF_INET6 &&
379 memcmp(&in6, &last6, sizeof(in6)) > 0 &&
380 memcmp(&in6, &cur6, sizeof(in6)) < 0) {
381 cur6 = in6;
382 found++;
383 }
384 }
385 if (found)
386 SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6));
387 } while (found);
388 #endif /* INET6 */
389
390 /* convert ipad to opad */
391 for (i = 0; i < sizeof(sc->sc_pad); i++)
392 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
393 }
394
395 static void
396 carp_hmac_generate(struct carp_softc *sc, uint32_t counter[2],
397 unsigned char md[20])
398 {
399 SHA1_CTX sha1ctx;
400
401 CARP_LOCK_ASSERT(sc);
402
403 /* fetch first half of inner hash */
404 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
405
406 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
407 SHA1Final(md, &sha1ctx);
408
409 /* outer hash */
410 SHA1Init(&sha1ctx);
411 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
412 SHA1Update(&sha1ctx, md, 20);
413 SHA1Final(md, &sha1ctx);
414 }
415
416 static int
417 carp_hmac_verify(struct carp_softc *sc, uint32_t counter[2],
418 unsigned char md[20])
419 {
420 unsigned char md2[20];
421
422 CARP_LOCK_ASSERT(sc);
423
424 carp_hmac_generate(sc, counter, md2);
425
426 return (bcmp(md, md2, sizeof(md2)));
427 }
428
429 /*
430 * process input packet.
431 * we have rearranged checks order compared to the rfc,
432 * but it seems more efficient this way or not possible otherwise.
433 */
434 #ifdef INET
435 void
436 carp_input(struct mbuf *m, int hlen)
437 {
438 struct ip *ip = mtod(m, struct ip *);
439 struct carp_header *ch;
440 int iplen, len;
441
442 CARPSTATS_INC(carps_ipackets);
443
444 if (!V_carp_allow) {
445 m_freem(m);
446 return;
447 }
448
449 /* verify that the IP TTL is 255. */
450 if (ip->ip_ttl != CARP_DFLTTL) {
451 CARPSTATS_INC(carps_badttl);
452 CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__,
453 ip->ip_ttl,
454 m->m_pkthdr.rcvif->if_xname);
455 m_freem(m);
456 return;
457 }
458
459 iplen = ip->ip_hl << 2;
460
461 if (m->m_pkthdr.len < iplen + sizeof(*ch)) {
462 CARPSTATS_INC(carps_badlen);
463 CARP_DEBUG("%s: received len %zd < sizeof(struct carp_header) "
464 "on %s\n", __func__, m->m_len - sizeof(struct ip),
465 m->m_pkthdr.rcvif->if_xname);
466 m_freem(m);
467 return;
468 }
469
470 if (iplen + sizeof(*ch) < m->m_len) {
471 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) {
472 CARPSTATS_INC(carps_hdrops);
473 CARP_DEBUG("%s: pullup failed\n", __func__);
474 return;
475 }
476 ip = mtod(m, struct ip *);
477 }
478 ch = (struct carp_header *)((char *)ip + iplen);
479
480 /*
481 * verify that the received packet length is
482 * equal to the CARP header
483 */
484 len = iplen + sizeof(*ch);
485 if (len > m->m_pkthdr.len) {
486 CARPSTATS_INC(carps_badlen);
487 CARP_DEBUG("%s: packet too short %d on %s\n", __func__,
488 m->m_pkthdr.len,
489 m->m_pkthdr.rcvif->if_xname);
490 m_freem(m);
491 return;
492 }
493
494 if ((m = m_pullup(m, len)) == NULL) {
495 CARPSTATS_INC(carps_hdrops);
496 return;
497 }
498 ip = mtod(m, struct ip *);
499 ch = (struct carp_header *)((char *)ip + iplen);
500
501 /* verify the CARP checksum */
502 m->m_data += iplen;
503 if (in_cksum(m, len - iplen)) {
504 CARPSTATS_INC(carps_badsum);
505 CARP_DEBUG("%s: checksum failed on %s\n", __func__,
506 m->m_pkthdr.rcvif->if_xname);
507 m_freem(m);
508 return;
509 }
510 m->m_data -= iplen;
511
512 carp_input_c(m, ch, AF_INET);
513 }
514 #endif
515
516 #ifdef INET6
517 int
518 carp6_input(struct mbuf **mp, int *offp, int proto)
519 {
520 struct mbuf *m = *mp;
521 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
522 struct carp_header *ch;
523 u_int len;
524
525 CARPSTATS_INC(carps_ipackets6);
526
527 if (!V_carp_allow) {
528 m_freem(m);
529 return (IPPROTO_DONE);
530 }
531
532 /* check if received on a valid carp interface */
533 if (m->m_pkthdr.rcvif->if_carp == NULL) {
534 CARPSTATS_INC(carps_badif);
535 CARP_DEBUG("%s: packet received on non-carp interface: %s\n",
536 __func__, m->m_pkthdr.rcvif->if_xname);
537 m_freem(m);
538 return (IPPROTO_DONE);
539 }
540
541 /* verify that the IP TTL is 255 */
542 if (ip6->ip6_hlim != CARP_DFLTTL) {
543 CARPSTATS_INC(carps_badttl);
544 CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__,
545 ip6->ip6_hlim, m->m_pkthdr.rcvif->if_xname);
546 m_freem(m);
547 return (IPPROTO_DONE);
548 }
549
550 /* verify that we have a complete carp packet */
551 len = m->m_len;
552 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
553 if (ch == NULL) {
554 CARPSTATS_INC(carps_badlen);
555 CARP_DEBUG("%s: packet size %u too small\n", __func__, len);
556 return (IPPROTO_DONE);
557 }
558
559
560 /* verify the CARP checksum */
561 m->m_data += *offp;
562 if (in_cksum(m, sizeof(*ch))) {
563 CARPSTATS_INC(carps_badsum);
564 CARP_DEBUG("%s: checksum failed, on %s\n", __func__,
565 m->m_pkthdr.rcvif->if_xname);
566 m_freem(m);
567 return (IPPROTO_DONE);
568 }
569 m->m_data -= *offp;
570
571 carp_input_c(m, ch, AF_INET6);
572 return (IPPROTO_DONE);
573 }
574 #endif /* INET6 */
575
576 static void
577 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af)
578 {
579 struct ifnet *ifp = m->m_pkthdr.rcvif;
580 struct ifaddr *ifa;
581 struct carp_softc *sc;
582 uint64_t tmp_counter;
583 struct timeval sc_tv, ch_tv;
584
585 /* verify that the VHID is valid on the receiving interface */
586 IF_ADDR_RLOCK(ifp);
587 IFNET_FOREACH_IFA(ifp, ifa)
588 if (ifa->ifa_addr->sa_family == af &&
589 ifa->ifa_carp->sc_vhid == ch->carp_vhid) {
590 ifa_ref(ifa);
591 break;
592 }
593 IF_ADDR_RUNLOCK(ifp);
594
595 if (ifa == NULL) {
596 CARPSTATS_INC(carps_badvhid);
597 m_freem(m);
598 return;
599 }
600
601 /* verify the CARP version. */
602 if (ch->carp_version != CARP_VERSION) {
603 CARPSTATS_INC(carps_badver);
604 CARP_DEBUG("%s: invalid version %d\n", ifp->if_xname,
605 ch->carp_version);
606 ifa_free(ifa);
607 m_freem(m);
608 return;
609 }
610
611 sc = ifa->ifa_carp;
612 CARP_LOCK(sc);
613 ifa_free(ifa);
614
615 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
616 CARPSTATS_INC(carps_badauth);
617 CARP_DEBUG("%s: incorrect hash for VHID %u@%s\n", __func__,
618 sc->sc_vhid, ifp->if_xname);
619 goto out;
620 }
621
622 tmp_counter = ntohl(ch->carp_counter[0]);
623 tmp_counter = tmp_counter<<32;
624 tmp_counter += ntohl(ch->carp_counter[1]);
625
626 /* XXX Replay protection goes here */
627
628 sc->sc_init_counter = 0;
629 sc->sc_counter = tmp_counter;
630
631 sc_tv.tv_sec = sc->sc_advbase;
632 sc_tv.tv_usec = DEMOTE_ADVSKEW(sc) * 1000000 / 256;
633 ch_tv.tv_sec = ch->carp_advbase;
634 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
635
636 switch (sc->sc_state) {
637 case INIT:
638 break;
639 case MASTER:
640 /*
641 * If we receive an advertisement from a master who's going to
642 * be more frequent than us, go into BACKUP state.
643 */
644 if (timevalcmp(&sc_tv, &ch_tv, >) ||
645 timevalcmp(&sc_tv, &ch_tv, ==)) {
646 callout_stop(&sc->sc_ad_tmo);
647 CARP_LOG("VHID %u@%s: MASTER -> BACKUP "
648 "(more frequent advertisement received)\n",
649 sc->sc_vhid,
650 sc->sc_carpdev->if_xname);
651 carp_set_state(sc, BACKUP);
652 carp_setrun(sc, 0);
653 carp_delroute(sc);
654 }
655 break;
656 case BACKUP:
657 /*
658 * If we're pre-empting masters who advertise slower than us,
659 * and this one claims to be slower, treat him as down.
660 */
661 if (V_carp_preempt && timevalcmp(&sc_tv, &ch_tv, <)) {
662 CARP_LOG("VHID %u@%s: BACKUP -> MASTER "
663 "(preempting a slower master)\n",
664 sc->sc_vhid,
665 sc->sc_carpdev->if_xname);
666 carp_master_down_locked(sc);
667 break;
668 }
669
670 /*
671 * If the master is going to advertise at such a low frequency
672 * that he's guaranteed to time out, we'd might as well just
673 * treat him as timed out now.
674 */
675 sc_tv.tv_sec = sc->sc_advbase * 3;
676 if (timevalcmp(&sc_tv, &ch_tv, <)) {
677 CARP_LOG("VHID %u@%s: BACKUP -> MASTER "
678 "(master timed out)\n",
679 sc->sc_vhid,
680 sc->sc_carpdev->if_xname);
681 carp_master_down_locked(sc);
682 break;
683 }
684
685 /*
686 * Otherwise, we reset the counter and wait for the next
687 * advertisement.
688 */
689 carp_setrun(sc, af);
690 break;
691 }
692
693 out:
694 CARP_UNLOCK(sc);
695 m_freem(m);
696 }
697
698 static int
699 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch)
700 {
701 struct m_tag *mtag;
702
703 if (sc->sc_init_counter) {
704 /* this could also be seconds since unix epoch */
705 sc->sc_counter = arc4random();
706 sc->sc_counter = sc->sc_counter << 32;
707 sc->sc_counter += arc4random();
708 } else
709 sc->sc_counter++;
710
711 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff);
712 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff);
713
714 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
715
716 /* Tag packet for carp_output */
717 if ((mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct carp_softc *),
718 M_NOWAIT)) == NULL) {
719 m_freem(m);
720 CARPSTATS_INC(carps_onomem);
721 return (ENOMEM);
722 }
723 bcopy(&sc, mtag + 1, sizeof(sc));
724 m_tag_prepend(m, mtag);
725
726 return (0);
727 }
728
729 /*
730 * To avoid LORs and possible recursions this function shouldn't
731 * be called directly, but scheduled via taskqueue.
732 */
733 static void
734 carp_send_ad_all(void *ctx __unused, int pending __unused)
735 {
736 struct carp_softc *sc;
737
738 mtx_lock(&carp_mtx);
739 LIST_FOREACH(sc, &carp_list, sc_next)
740 if (sc->sc_state == MASTER) {
741 CARP_LOCK(sc);
742 CURVNET_SET(sc->sc_carpdev->if_vnet);
743 carp_send_ad_locked(sc);
744 CURVNET_RESTORE();
745 CARP_UNLOCK(sc);
746 }
747 mtx_unlock(&carp_mtx);
748 }
749
750 /* Send a periodic advertisement, executed in callout context. */
751 static void
752 carp_send_ad(void *v)
753 {
754 struct carp_softc *sc = v;
755
756 CARP_LOCK_ASSERT(sc);
757 CURVNET_SET(sc->sc_carpdev->if_vnet);
758 carp_send_ad_locked(sc);
759 CURVNET_RESTORE();
760 CARP_UNLOCK(sc);
761 }
762
763 static void
764 carp_send_ad_locked(struct carp_softc *sc)
765 {
766 struct carp_header ch;
767 struct timeval tv;
768 struct sockaddr sa;
769 struct ifaddr *ifa;
770 struct carp_header *ch_ptr;
771 struct mbuf *m;
772 int len, advskew;
773
774 CARP_LOCK_ASSERT(sc);
775
776 advskew = DEMOTE_ADVSKEW(sc);
777 tv.tv_sec = sc->sc_advbase;
778 tv.tv_usec = advskew * 1000000 / 256;
779
780 ch.carp_version = CARP_VERSION;
781 ch.carp_type = CARP_ADVERTISEMENT;
782 ch.carp_vhid = sc->sc_vhid;
783 ch.carp_advbase = sc->sc_advbase;
784 ch.carp_advskew = advskew;
785 ch.carp_authlen = 7; /* XXX DEFINE */
786 ch.carp_pad1 = 0; /* must be zero */
787 ch.carp_cksum = 0;
788
789 /* XXXGL: OpenBSD picks first ifaddr with needed family. */
790
791 #ifdef INET
792 if (sc->sc_naddrs) {
793 struct ip *ip;
794
795 m = m_gethdr(M_NOWAIT, MT_DATA);
796 if (m == NULL) {
797 CARPSTATS_INC(carps_onomem);
798 goto resched;
799 }
800 len = sizeof(*ip) + sizeof(ch);
801 m->m_pkthdr.len = len;
802 m->m_pkthdr.rcvif = NULL;
803 m->m_len = len;
804 MH_ALIGN(m, m->m_len);
805 m->m_flags |= M_MCAST;
806 ip = mtod(m, struct ip *);
807 ip->ip_v = IPVERSION;
808 ip->ip_hl = sizeof(*ip) >> 2;
809 ip->ip_tos = IPTOS_LOWDELAY;
810 ip->ip_len = htons(len);
811 ip->ip_id = ip_newid();
812 ip->ip_off = htons(IP_DF);
813 ip->ip_ttl = CARP_DFLTTL;
814 ip->ip_p = IPPROTO_CARP;
815 ip->ip_sum = 0;
816
817 bzero(&sa, sizeof(sa));
818 sa.sa_family = AF_INET;
819 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev);
820 if (ifa != NULL) {
821 ip->ip_src.s_addr =
822 ifatoia(ifa)->ia_addr.sin_addr.s_addr;
823 ifa_free(ifa);
824 } else
825 ip->ip_src.s_addr = 0;
826 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
827
828 ch_ptr = (struct carp_header *)(&ip[1]);
829 bcopy(&ch, ch_ptr, sizeof(ch));
830 if (carp_prepare_ad(m, sc, ch_ptr))
831 goto resched;
832
833 m->m_data += sizeof(*ip);
834 ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip));
835 m->m_data -= sizeof(*ip);
836
837 CARPSTATS_INC(carps_opackets);
838
839 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT,
840 &sc->sc_carpdev->if_carp->cif_imo, NULL)) {
841 if (sc->sc_sendad_errors < INT_MAX)
842 sc->sc_sendad_errors++;
843 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS)
844 carp_demote_adj(V_carp_senderr_adj,
845 "send error");
846 sc->sc_sendad_success = 0;
847 } else {
848 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
849 if (++sc->sc_sendad_success >=
850 CARP_SENDAD_MIN_SUCCESS) {
851 carp_demote_adj(-V_carp_senderr_adj,
852 "send ok");
853 sc->sc_sendad_errors = 0;
854 }
855 } else
856 sc->sc_sendad_errors = 0;
857 }
858 }
859 #endif /* INET */
860 #ifdef INET6
861 if (sc->sc_naddrs6) {
862 struct ip6_hdr *ip6;
863
864 m = m_gethdr(M_NOWAIT, MT_DATA);
865 if (m == NULL) {
866 CARPSTATS_INC(carps_onomem);
867 goto resched;
868 }
869 len = sizeof(*ip6) + sizeof(ch);
870 m->m_pkthdr.len = len;
871 m->m_pkthdr.rcvif = NULL;
872 m->m_len = len;
873 MH_ALIGN(m, m->m_len);
874 m->m_flags |= M_MCAST;
875 ip6 = mtod(m, struct ip6_hdr *);
876 bzero(ip6, sizeof(*ip6));
877 ip6->ip6_vfc |= IPV6_VERSION;
878 ip6->ip6_hlim = CARP_DFLTTL;
879 ip6->ip6_nxt = IPPROTO_CARP;
880 bzero(&sa, sizeof(sa));
881
882 /* set the source address */
883 sa.sa_family = AF_INET6;
884 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev);
885 if (ifa != NULL) {
886 bcopy(IFA_IN6(ifa), &ip6->ip6_src,
887 sizeof(struct in6_addr));
888 ifa_free(ifa);
889 } else
890 /* This should never happen with IPv6. */
891 bzero(&ip6->ip6_src, sizeof(struct in6_addr));
892
893 /* Set the multicast destination. */
894 ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
895 ip6->ip6_dst.s6_addr8[15] = 0x12;
896 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
897 m_freem(m);
898 CARP_DEBUG("%s: in6_setscope failed\n", __func__);
899 goto resched;
900 }
901
902 ch_ptr = (struct carp_header *)(&ip6[1]);
903 bcopy(&ch, ch_ptr, sizeof(ch));
904 if (carp_prepare_ad(m, sc, ch_ptr))
905 goto resched;
906
907 m->m_data += sizeof(*ip6);
908 ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip6));
909 m->m_data -= sizeof(*ip6);
910
911 CARPSTATS_INC(carps_opackets6);
912
913 if (ip6_output(m, NULL, NULL, 0,
914 &sc->sc_carpdev->if_carp->cif_im6o, NULL, NULL)) {
915 if (sc->sc_sendad_errors < INT_MAX)
916 sc->sc_sendad_errors++;
917 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS)
918 carp_demote_adj(V_carp_senderr_adj,
919 "send6 error");
920 sc->sc_sendad_success = 0;
921 } else {
922 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
923 if (++sc->sc_sendad_success >=
924 CARP_SENDAD_MIN_SUCCESS) {
925 carp_demote_adj(-V_carp_senderr_adj,
926 "send6 ok");
927 sc->sc_sendad_errors = 0;
928 }
929 } else
930 sc->sc_sendad_errors = 0;
931 }
932 }
933 #endif /* INET6 */
934
935 resched:
936 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), carp_send_ad, sc);
937 }
938
939 static void
940 carp_addroute(struct carp_softc *sc)
941 {
942 struct ifaddr *ifa;
943
944 CARP_FOREACH_IFA(sc, ifa)
945 carp_ifa_addroute(ifa);
946 }
947
948 static void
949 carp_ifa_addroute(struct ifaddr *ifa)
950 {
951
952 switch (ifa->ifa_addr->sa_family) {
953 #ifdef INET
954 case AF_INET:
955 in_addprefix(ifatoia(ifa), RTF_UP);
956 ifa_add_loopback_route(ifa,
957 (struct sockaddr *)&ifatoia(ifa)->ia_addr);
958 break;
959 #endif
960 #ifdef INET6
961 case AF_INET6:
962 ifa_add_loopback_route(ifa,
963 (struct sockaddr *)&ifatoia6(ifa)->ia_addr);
964 in6_ifaddloop(ifa);
965 break;
966 #endif
967 }
968 }
969
970 static void
971 carp_delroute(struct carp_softc *sc)
972 {
973 struct ifaddr *ifa;
974
975 CARP_FOREACH_IFA(sc, ifa)
976 carp_ifa_delroute(ifa);
977 }
978
979 static void
980 carp_ifa_delroute(struct ifaddr *ifa)
981 {
982
983 switch (ifa->ifa_addr->sa_family) {
984 #ifdef INET
985 case AF_INET:
986 ifa_del_loopback_route(ifa,
987 (struct sockaddr *)&ifatoia(ifa)->ia_addr);
988 in_scrubprefix(ifatoia(ifa), LLE_STATIC);
989 break;
990 #endif
991 #ifdef INET6
992 case AF_INET6:
993 ifa_del_loopback_route(ifa,
994 (struct sockaddr *)&ifatoia6(ifa)->ia_addr);
995 in6_ifremloop(ifa);
996 break;
997 #endif
998 }
999 }
1000
1001 int
1002 carp_master(struct ifaddr *ifa)
1003 {
1004 struct carp_softc *sc = ifa->ifa_carp;
1005
1006 return (sc->sc_state == MASTER);
1007 }
1008
1009 #ifdef INET
1010 /*
1011 * Broadcast a gratuitous ARP request containing
1012 * the virtual router MAC address for each IP address
1013 * associated with the virtual router.
1014 */
1015 static void
1016 carp_send_arp(struct carp_softc *sc)
1017 {
1018 struct ifaddr *ifa;
1019
1020 CARP_FOREACH_IFA(sc, ifa)
1021 if (ifa->ifa_addr->sa_family == AF_INET)
1022 arp_ifinit2(sc->sc_carpdev, ifa, LLADDR(&sc->sc_addr));
1023 }
1024
1025 int
1026 carp_iamatch(struct ifaddr *ifa, uint8_t **enaddr)
1027 {
1028 struct carp_softc *sc = ifa->ifa_carp;
1029
1030 if (sc->sc_state == MASTER) {
1031 *enaddr = LLADDR(&sc->sc_addr);
1032 return (1);
1033 }
1034
1035 return (0);
1036 }
1037 #endif
1038
1039 #ifdef INET6
1040 static void
1041 carp_send_na(struct carp_softc *sc)
1042 {
1043 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1044 struct ifaddr *ifa;
1045 struct in6_addr *in6;
1046
1047 CARP_FOREACH_IFA(sc, ifa) {
1048 if (ifa->ifa_addr->sa_family != AF_INET6)
1049 continue;
1050
1051 in6 = IFA_IN6(ifa);
1052 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1053 ND_NA_FLAG_OVERRIDE, 1, NULL);
1054 DELAY(1000); /* XXX */
1055 }
1056 }
1057
1058 /*
1059 * Returns ifa in case it's a carp address and it is MASTER, or if the address
1060 * matches and is not a carp address. Returns NULL otherwise.
1061 */
1062 struct ifaddr *
1063 carp_iamatch6(struct ifnet *ifp, struct in6_addr *taddr)
1064 {
1065 struct ifaddr *ifa;
1066
1067 ifa = NULL;
1068 IF_ADDR_RLOCK(ifp);
1069 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1070 if (ifa->ifa_addr->sa_family != AF_INET6)
1071 continue;
1072 if (!IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa)))
1073 continue;
1074 if (ifa->ifa_carp && ifa->ifa_carp->sc_state != MASTER)
1075 ifa = NULL;
1076 else
1077 ifa_ref(ifa);
1078 break;
1079 }
1080 IF_ADDR_RUNLOCK(ifp);
1081
1082 return (ifa);
1083 }
1084
1085 caddr_t
1086 carp_macmatch6(struct ifnet *ifp, struct mbuf *m, const struct in6_addr *taddr)
1087 {
1088 struct ifaddr *ifa;
1089
1090 IF_ADDR_RLOCK(ifp);
1091 IFNET_FOREACH_IFA(ifp, ifa)
1092 if (ifa->ifa_addr->sa_family == AF_INET6 &&
1093 IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) {
1094 struct carp_softc *sc = ifa->ifa_carp;
1095 struct m_tag *mtag;
1096
1097 IF_ADDR_RUNLOCK(ifp);
1098
1099 mtag = m_tag_get(PACKET_TAG_CARP,
1100 sizeof(struct carp_softc *), M_NOWAIT);
1101 if (mtag == NULL)
1102 /* Better a bit than nothing. */
1103 return (LLADDR(&sc->sc_addr));
1104
1105 bcopy(&sc, mtag + 1, sizeof(sc));
1106 m_tag_prepend(m, mtag);
1107
1108 return (LLADDR(&sc->sc_addr));
1109 }
1110 IF_ADDR_RUNLOCK(ifp);
1111
1112 return (NULL);
1113 }
1114 #endif /* INET6 */
1115
1116 int
1117 carp_forus(struct ifnet *ifp, u_char *dhost)
1118 {
1119 struct carp_softc *sc;
1120 uint8_t *ena = dhost;
1121
1122 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
1123 return (0);
1124
1125 CIF_LOCK(ifp->if_carp);
1126 IFNET_FOREACH_CARP(ifp, sc) {
1127 CARP_LOCK(sc);
1128 if (sc->sc_state == MASTER && !bcmp(dhost, LLADDR(&sc->sc_addr),
1129 ETHER_ADDR_LEN)) {
1130 CARP_UNLOCK(sc);
1131 CIF_UNLOCK(ifp->if_carp);
1132 return (1);
1133 }
1134 CARP_UNLOCK(sc);
1135 }
1136 CIF_UNLOCK(ifp->if_carp);
1137
1138 return (0);
1139 }
1140
1141 /* Master down timeout event, executed in callout context. */
1142 static void
1143 carp_master_down(void *v)
1144 {
1145 struct carp_softc *sc = v;
1146
1147 CARP_LOCK_ASSERT(sc);
1148
1149 CURVNET_SET(sc->sc_carpdev->if_vnet);
1150 if (sc->sc_state == BACKUP) {
1151 CARP_LOG("VHID %u@%s: BACKUP -> MASTER (master down)\n",
1152 sc->sc_vhid,
1153 sc->sc_carpdev->if_xname);
1154 carp_master_down_locked(sc);
1155 }
1156 CURVNET_RESTORE();
1157
1158 CARP_UNLOCK(sc);
1159 }
1160
1161 static void
1162 carp_master_down_locked(struct carp_softc *sc)
1163 {
1164
1165 CARP_LOCK_ASSERT(sc);
1166
1167 switch (sc->sc_state) {
1168 case BACKUP:
1169 carp_set_state(sc, MASTER);
1170 carp_send_ad_locked(sc);
1171 #ifdef INET
1172 carp_send_arp(sc);
1173 #endif
1174 #ifdef INET6
1175 carp_send_na(sc);
1176 #endif
1177 carp_setrun(sc, 0);
1178 carp_addroute(sc);
1179 break;
1180 case INIT:
1181 case MASTER:
1182 #ifdef INVARIANTS
1183 panic("carp: VHID %u@%s: master_down event in %s state\n",
1184 sc->sc_vhid,
1185 sc->sc_carpdev->if_xname,
1186 sc->sc_state ? "MASTER" : "INIT");
1187 #endif
1188 break;
1189 }
1190 }
1191
1192 /*
1193 * When in backup state, af indicates whether to reset the master down timer
1194 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1195 */
1196 static void
1197 carp_setrun(struct carp_softc *sc, sa_family_t af)
1198 {
1199 struct timeval tv;
1200
1201 CARP_LOCK_ASSERT(sc);
1202
1203 if ((sc->sc_carpdev->if_flags & IFF_UP) == 0 ||
1204 sc->sc_carpdev->if_link_state != LINK_STATE_UP ||
1205 (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0))
1206 return;
1207
1208 switch (sc->sc_state) {
1209 case INIT:
1210 CARP_LOG("VHID %u@%s: INIT -> BACKUP\n",
1211 sc->sc_vhid,
1212 sc->sc_carpdev->if_xname);
1213 carp_set_state(sc, BACKUP);
1214 carp_setrun(sc, 0);
1215 break;
1216 case BACKUP:
1217 callout_stop(&sc->sc_ad_tmo);
1218 tv.tv_sec = 3 * sc->sc_advbase;
1219 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1220 switch (af) {
1221 #ifdef INET
1222 case AF_INET:
1223 callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
1224 carp_master_down, sc);
1225 break;
1226 #endif
1227 #ifdef INET6
1228 case AF_INET6:
1229 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
1230 carp_master_down, sc);
1231 break;
1232 #endif
1233 default:
1234 #ifdef INET
1235 if (sc->sc_naddrs)
1236 callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
1237 carp_master_down, sc);
1238 #endif
1239 #ifdef INET6
1240 if (sc->sc_naddrs6)
1241 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
1242 carp_master_down, sc);
1243 #endif
1244 break;
1245 }
1246 break;
1247 case MASTER:
1248 tv.tv_sec = sc->sc_advbase;
1249 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1250 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1251 carp_send_ad, sc);
1252 break;
1253 }
1254 }
1255
1256 /*
1257 * Setup multicast structures.
1258 */
1259 static int
1260 carp_multicast_setup(struct carp_if *cif, sa_family_t sa)
1261 {
1262 struct ifnet *ifp = cif->cif_ifp;
1263 int error = 0;
1264
1265 CIF_LOCK_ASSERT(cif);
1266
1267 switch (sa) {
1268 #ifdef INET
1269 case AF_INET:
1270 {
1271 struct ip_moptions *imo = &cif->cif_imo;
1272 struct in_addr addr;
1273
1274 if (imo->imo_membership)
1275 return (0);
1276
1277 imo->imo_membership = (struct in_multi **)malloc(
1278 (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP,
1279 M_NOWAIT);
1280 if (imo->imo_membership == NULL)
1281 return (ENOMEM);
1282 imo->imo_mfilters = NULL;
1283 imo->imo_max_memberships = IP_MIN_MEMBERSHIPS;
1284 imo->imo_multicast_vif = -1;
1285
1286 addr.s_addr = htonl(INADDR_CARP_GROUP);
1287 if ((error = in_joingroup(ifp, &addr, NULL,
1288 &imo->imo_membership[0])) != 0) {
1289 free(imo->imo_membership, M_CARP);
1290 break;
1291 }
1292 imo->imo_num_memberships++;
1293 imo->imo_multicast_ifp = ifp;
1294 imo->imo_multicast_ttl = CARP_DFLTTL;
1295 imo->imo_multicast_loop = 0;
1296 break;
1297 }
1298 #endif
1299 #ifdef INET6
1300 case AF_INET6:
1301 {
1302 struct ip6_moptions *im6o = &cif->cif_im6o;
1303 struct in6_addr in6;
1304 struct in6_multi *in6m;
1305
1306 if (im6o->im6o_membership)
1307 return (0);
1308
1309 im6o->im6o_membership = (struct in6_multi **)malloc(
1310 (sizeof(struct in6_multi *) * IPV6_MIN_MEMBERSHIPS), M_CARP,
1311 M_ZERO | M_NOWAIT);
1312 if (im6o->im6o_membership == NULL)
1313 return (ENOMEM);
1314 im6o->im6o_mfilters = NULL;
1315 im6o->im6o_max_memberships = IPV6_MIN_MEMBERSHIPS;
1316 im6o->im6o_multicast_hlim = CARP_DFLTTL;
1317 im6o->im6o_multicast_ifp = ifp;
1318
1319 /* Join IPv6 CARP multicast group. */
1320 bzero(&in6, sizeof(in6));
1321 in6.s6_addr16[0] = htons(0xff02);
1322 in6.s6_addr8[15] = 0x12;
1323 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) {
1324 free(im6o->im6o_membership, M_CARP);
1325 break;
1326 }
1327 in6m = NULL;
1328 if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) {
1329 free(im6o->im6o_membership, M_CARP);
1330 break;
1331 }
1332 im6o->im6o_membership[0] = in6m;
1333 im6o->im6o_num_memberships++;
1334
1335 /* Join solicited multicast address. */
1336 bzero(&in6, sizeof(in6));
1337 in6.s6_addr16[0] = htons(0xff02);
1338 in6.s6_addr32[1] = 0;
1339 in6.s6_addr32[2] = htonl(1);
1340 in6.s6_addr32[3] = 0;
1341 in6.s6_addr8[12] = 0xff;
1342 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) {
1343 in6_mc_leave(im6o->im6o_membership[0], NULL);
1344 free(im6o->im6o_membership, M_CARP);
1345 break;
1346 }
1347 in6m = NULL;
1348 if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) {
1349 in6_mc_leave(im6o->im6o_membership[0], NULL);
1350 free(im6o->im6o_membership, M_CARP);
1351 break;
1352 }
1353 im6o->im6o_membership[1] = in6m;
1354 im6o->im6o_num_memberships++;
1355 break;
1356 }
1357 #endif
1358 }
1359
1360 return (error);
1361 }
1362
1363 /*
1364 * Free multicast structures.
1365 */
1366 static void
1367 carp_multicast_cleanup(struct carp_if *cif, sa_family_t sa)
1368 {
1369
1370 CIF_LOCK_ASSERT(cif);
1371 switch (sa) {
1372 #ifdef INET
1373 case AF_INET:
1374 if (cif->cif_naddrs == 0) {
1375 struct ip_moptions *imo = &cif->cif_imo;
1376
1377 in_leavegroup(imo->imo_membership[0], NULL);
1378 KASSERT(imo->imo_mfilters == NULL,
1379 ("%s: imo_mfilters != NULL", __func__));
1380 free(imo->imo_membership, M_CARP);
1381 imo->imo_membership = NULL;
1382
1383 }
1384 break;
1385 #endif
1386 #ifdef INET6
1387 case AF_INET6:
1388 if (cif->cif_naddrs6 == 0) {
1389 struct ip6_moptions *im6o = &cif->cif_im6o;
1390
1391 in6_mc_leave(im6o->im6o_membership[0], NULL);
1392 in6_mc_leave(im6o->im6o_membership[1], NULL);
1393 KASSERT(im6o->im6o_mfilters == NULL,
1394 ("%s: im6o_mfilters != NULL", __func__));
1395 free(im6o->im6o_membership, M_CARP);
1396 im6o->im6o_membership = NULL;
1397 }
1398 break;
1399 #endif
1400 }
1401 }
1402
1403 int
1404 carp_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa)
1405 {
1406 struct m_tag *mtag;
1407 struct carp_softc *sc;
1408
1409 if (!sa)
1410 return (0);
1411
1412 switch (sa->sa_family) {
1413 #ifdef INET
1414 case AF_INET:
1415 break;
1416 #endif
1417 #ifdef INET6
1418 case AF_INET6:
1419 break;
1420 #endif
1421 default:
1422 return (0);
1423 }
1424
1425 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL);
1426 if (mtag == NULL)
1427 return (0);
1428
1429 bcopy(mtag + 1, &sc, sizeof(sc));
1430
1431 /* Set the source MAC address to the Virtual Router MAC Address. */
1432 switch (ifp->if_type) {
1433 case IFT_ETHER:
1434 case IFT_BRIDGE:
1435 case IFT_L2VLAN: {
1436 struct ether_header *eh;
1437
1438 eh = mtod(m, struct ether_header *);
1439 eh->ether_shost[0] = 0;
1440 eh->ether_shost[1] = 0;
1441 eh->ether_shost[2] = 0x5e;
1442 eh->ether_shost[3] = 0;
1443 eh->ether_shost[4] = 1;
1444 eh->ether_shost[5] = sc->sc_vhid;
1445 }
1446 break;
1447 case IFT_FDDI: {
1448 struct fddi_header *fh;
1449
1450 fh = mtod(m, struct fddi_header *);
1451 fh->fddi_shost[0] = 0;
1452 fh->fddi_shost[1] = 0;
1453 fh->fddi_shost[2] = 0x5e;
1454 fh->fddi_shost[3] = 0;
1455 fh->fddi_shost[4] = 1;
1456 fh->fddi_shost[5] = sc->sc_vhid;
1457 }
1458 break;
1459 case IFT_ISO88025: {
1460 struct iso88025_header *th;
1461 th = mtod(m, struct iso88025_header *);
1462 th->iso88025_shost[0] = 3;
1463 th->iso88025_shost[1] = 0;
1464 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1);
1465 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1);
1466 th->iso88025_shost[4] = 0;
1467 th->iso88025_shost[5] = 0;
1468 }
1469 break;
1470 default:
1471 printf("%s: carp is not supported for the %d interface type\n",
1472 ifp->if_xname, ifp->if_type);
1473 return (EOPNOTSUPP);
1474 }
1475
1476 return (0);
1477 }
1478
1479 static struct carp_softc*
1480 carp_alloc(struct ifnet *ifp)
1481 {
1482 struct carp_softc *sc;
1483 struct carp_if *cif;
1484
1485 if ((cif = ifp->if_carp) == NULL) {
1486 cif = carp_alloc_if(ifp);
1487 if (cif == NULL)
1488 return (NULL);
1489 }
1490
1491 sc = malloc(sizeof(*sc), M_CARP, M_WAITOK|M_ZERO);
1492
1493 sc->sc_advbase = CARP_DFLTINTV;
1494 sc->sc_vhid = -1; /* required setting */
1495 sc->sc_init_counter = 1;
1496 sc->sc_state = INIT;
1497
1498 sc->sc_ifasiz = sizeof(struct ifaddr *);
1499 sc->sc_ifas = malloc(sc->sc_ifasiz, M_CARP, M_WAITOK|M_ZERO);
1500 sc->sc_carpdev = ifp;
1501
1502 CARP_LOCK_INIT(sc);
1503 #ifdef INET
1504 callout_init_mtx(&sc->sc_md_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED);
1505 #endif
1506 #ifdef INET6
1507 callout_init_mtx(&sc->sc_md6_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED);
1508 #endif
1509 callout_init_mtx(&sc->sc_ad_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED);
1510
1511 CIF_LOCK(cif);
1512 TAILQ_INSERT_TAIL(&cif->cif_vrs, sc, sc_list);
1513 CIF_UNLOCK(cif);
1514
1515 mtx_lock(&carp_mtx);
1516 LIST_INSERT_HEAD(&carp_list, sc, sc_next);
1517 mtx_unlock(&carp_mtx);
1518
1519 return (sc);
1520 }
1521
1522 static int
1523 carp_grow_ifas(struct carp_softc *sc)
1524 {
1525 struct ifaddr **new;
1526
1527 CARP_LOCK_ASSERT(sc);
1528
1529 new = malloc(sc->sc_ifasiz * 2, M_CARP, M_NOWAIT|M_ZERO);
1530 if (new == NULL)
1531 return (ENOMEM);
1532 bcopy(sc->sc_ifas, new, sc->sc_ifasiz);
1533 free(sc->sc_ifas, M_CARP);
1534 sc->sc_ifas = new;
1535 sc->sc_ifasiz *= 2;
1536
1537 return (0);
1538 }
1539
1540 static void
1541 carp_destroy(struct carp_softc *sc)
1542 {
1543 struct ifnet *ifp = sc->sc_carpdev;
1544 struct carp_if *cif = ifp->if_carp;
1545
1546 CIF_LOCK_ASSERT(cif);
1547
1548 TAILQ_REMOVE(&cif->cif_vrs, sc, sc_list);
1549
1550 mtx_lock(&carp_mtx);
1551 LIST_REMOVE(sc, sc_next);
1552 mtx_unlock(&carp_mtx);
1553
1554 CARP_LOCK(sc);
1555 if (sc->sc_suppress)
1556 carp_demote_adj(-V_carp_ifdown_adj, "vhid removed");
1557 callout_drain(&sc->sc_ad_tmo);
1558 #ifdef INET
1559 callout_drain(&sc->sc_md_tmo);
1560 #endif
1561 #ifdef INET6
1562 callout_drain(&sc->sc_md6_tmo);
1563 #endif
1564 CARP_LOCK_DESTROY(sc);
1565
1566 free(sc->sc_ifas, M_CARP);
1567 free(sc, M_CARP);
1568 }
1569
1570 static struct carp_if*
1571 carp_alloc_if(struct ifnet *ifp)
1572 {
1573 struct carp_if *cif;
1574
1575 cif = malloc(sizeof(*cif), M_CARP, M_WAITOK|M_ZERO);
1576
1577 if (ifpromisc(ifp, 1) != 0)
1578 goto cleanup;
1579
1580 CIF_LOCK_INIT(cif);
1581 cif->cif_ifp = ifp;
1582 TAILQ_INIT(&cif->cif_vrs);
1583
1584 IF_ADDR_WLOCK(ifp);
1585 ifp->if_carp = cif;
1586 if_ref(ifp);
1587 IF_ADDR_WUNLOCK(ifp);
1588
1589 return (cif);
1590
1591 cleanup:
1592 free(cif, M_CARP);
1593
1594 return (NULL);
1595 }
1596
1597 static void
1598 carp_free_if(struct carp_if *cif)
1599 {
1600 struct ifnet *ifp = cif->cif_ifp;
1601
1602 CIF_LOCK_ASSERT(cif);
1603 KASSERT(TAILQ_EMPTY(&cif->cif_vrs), ("%s: softc list not empty",
1604 __func__));
1605
1606 IF_ADDR_WLOCK(ifp);
1607 ifp->if_carp = NULL;
1608 IF_ADDR_WUNLOCK(ifp);
1609
1610 CIF_LOCK_DESTROY(cif);
1611
1612 ifpromisc(ifp, 0);
1613 if_rele(ifp);
1614
1615 free(cif, M_CARP);
1616 }
1617
1618 static void
1619 carp_carprcp(struct carpreq *carpr, struct carp_softc *sc, int priv)
1620 {
1621
1622 CARP_LOCK(sc);
1623 carpr->carpr_state = sc->sc_state;
1624 carpr->carpr_vhid = sc->sc_vhid;
1625 carpr->carpr_advbase = sc->sc_advbase;
1626 carpr->carpr_advskew = sc->sc_advskew;
1627 if (priv)
1628 bcopy(sc->sc_key, carpr->carpr_key, sizeof(carpr->carpr_key));
1629 else
1630 bzero(carpr->carpr_key, sizeof(carpr->carpr_key));
1631 CARP_UNLOCK(sc);
1632 }
1633
1634 int
1635 carp_ioctl(struct ifreq *ifr, u_long cmd, struct thread *td)
1636 {
1637 struct carpreq carpr;
1638 struct ifnet *ifp;
1639 struct carp_softc *sc = NULL;
1640 int error = 0, locked = 0;
1641
1642 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr)))
1643 return (error);
1644
1645 ifp = ifunit_ref(ifr->ifr_name);
1646 if (ifp == NULL)
1647 return (ENXIO);
1648
1649 switch (ifp->if_type) {
1650 case IFT_ETHER:
1651 case IFT_L2VLAN:
1652 case IFT_BRIDGE:
1653 case IFT_FDDI:
1654 case IFT_ISO88025:
1655 break;
1656 default:
1657 error = EOPNOTSUPP;
1658 goto out;
1659 }
1660
1661 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
1662 error = EADDRNOTAVAIL;
1663 goto out;
1664 }
1665
1666 switch (cmd) {
1667 case SIOCSVH:
1668 if ((error = priv_check(td, PRIV_NETINET_CARP)))
1669 break;
1670 if (carpr.carpr_vhid <= 0 || carpr.carpr_vhid > CARP_MAXVHID ||
1671 carpr.carpr_advbase < 0 || carpr.carpr_advskew < 0) {
1672 error = EINVAL;
1673 break;
1674 }
1675
1676 if (ifp->if_carp) {
1677 CIF_LOCK(ifp->if_carp);
1678 IFNET_FOREACH_CARP(ifp, sc)
1679 if (sc->sc_vhid == carpr.carpr_vhid)
1680 break;
1681 CIF_UNLOCK(ifp->if_carp);
1682 }
1683 if (sc == NULL) {
1684 sc = carp_alloc(ifp);
1685 if (sc == NULL) {
1686 error = EINVAL; /* XXX: ifpromisc failed */
1687 break;
1688 }
1689
1690 CARP_LOCK(sc);
1691 sc->sc_vhid = carpr.carpr_vhid;
1692 LLADDR(&sc->sc_addr)[0] = 0;
1693 LLADDR(&sc->sc_addr)[1] = 0;
1694 LLADDR(&sc->sc_addr)[2] = 0x5e;
1695 LLADDR(&sc->sc_addr)[3] = 0;
1696 LLADDR(&sc->sc_addr)[4] = 1;
1697 LLADDR(&sc->sc_addr)[5] = sc->sc_vhid;
1698 } else
1699 CARP_LOCK(sc);
1700 locked = 1;
1701 if (carpr.carpr_advbase > 0) {
1702 if (carpr.carpr_advbase > 255 ||
1703 carpr.carpr_advbase < CARP_DFLTINTV) {
1704 error = EINVAL;
1705 break;
1706 }
1707 sc->sc_advbase = carpr.carpr_advbase;
1708 }
1709 if (carpr.carpr_advskew > 0) {
1710 if (carpr.carpr_advskew >= 255) {
1711 error = EINVAL;
1712 break;
1713 }
1714 sc->sc_advskew = carpr.carpr_advskew;
1715 }
1716 if (carpr.carpr_key[0] != '\0') {
1717 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key));
1718 carp_hmac_prepare(sc);
1719 }
1720 if (sc->sc_state != INIT &&
1721 carpr.carpr_state != sc->sc_state) {
1722 switch (carpr.carpr_state) {
1723 case BACKUP:
1724 callout_stop(&sc->sc_ad_tmo);
1725 carp_set_state(sc, BACKUP);
1726 carp_setrun(sc, 0);
1727 carp_delroute(sc);
1728 break;
1729 case MASTER:
1730 carp_master_down_locked(sc);
1731 break;
1732 default:
1733 break;
1734 }
1735 }
1736 break;
1737
1738 case SIOCGVH:
1739 {
1740 int priveleged;
1741
1742 if (carpr.carpr_vhid < 0 || carpr.carpr_vhid > CARP_MAXVHID) {
1743 error = EINVAL;
1744 break;
1745 }
1746 if (carpr.carpr_count < 1) {
1747 error = EMSGSIZE;
1748 break;
1749 }
1750 if (ifp->if_carp == NULL) {
1751 error = ENOENT;
1752 break;
1753 }
1754
1755 priveleged = (priv_check(td, PRIV_NETINET_CARP) == 0);
1756 if (carpr.carpr_vhid != 0) {
1757 CIF_LOCK(ifp->if_carp);
1758 IFNET_FOREACH_CARP(ifp, sc)
1759 if (sc->sc_vhid == carpr.carpr_vhid)
1760 break;
1761 CIF_UNLOCK(ifp->if_carp);
1762 if (sc == NULL) {
1763 error = ENOENT;
1764 break;
1765 }
1766 carp_carprcp(&carpr, sc, priveleged);
1767 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
1768 } else {
1769 int i, count;
1770
1771 count = 0;
1772 CIF_LOCK(ifp->if_carp);
1773 IFNET_FOREACH_CARP(ifp, sc)
1774 count++;
1775
1776 if (count > carpr.carpr_count) {
1777 CIF_UNLOCK(ifp->if_carp);
1778 error = EMSGSIZE;
1779 break;
1780 }
1781
1782 i = 0;
1783 IFNET_FOREACH_CARP(ifp, sc) {
1784 carp_carprcp(&carpr, sc, priveleged);
1785 carpr.carpr_count = count;
1786 error = copyout(&carpr, ifr->ifr_data +
1787 (i * sizeof(carpr)), sizeof(carpr));
1788 if (error) {
1789 CIF_UNLOCK(ifp->if_carp);
1790 break;
1791 }
1792 i++;
1793 }
1794 CIF_UNLOCK(ifp->if_carp);
1795 }
1796 break;
1797 }
1798 default:
1799 error = EINVAL;
1800 }
1801
1802 out:
1803 if (locked)
1804 CARP_UNLOCK(sc);
1805 if_rele(ifp);
1806
1807 return (error);
1808 }
1809
1810 static int
1811 carp_get_vhid(struct ifaddr *ifa)
1812 {
1813
1814 if (ifa == NULL || ifa->ifa_carp == NULL)
1815 return (0);
1816
1817 return (ifa->ifa_carp->sc_vhid);
1818 }
1819
1820 int
1821 carp_attach(struct ifaddr *ifa, int vhid)
1822 {
1823 struct ifnet *ifp = ifa->ifa_ifp;
1824 struct carp_if *cif = ifp->if_carp;
1825 struct carp_softc *sc;
1826 int index, error;
1827
1828 if (ifp->if_carp == NULL)
1829 return (ENOPROTOOPT);
1830
1831 switch (ifa->ifa_addr->sa_family) {
1832 #ifdef INET
1833 case AF_INET:
1834 #endif
1835 #ifdef INET6
1836 case AF_INET6:
1837 #endif
1838 break;
1839 default:
1840 return (EPROTOTYPE);
1841 }
1842
1843 CIF_LOCK(cif);
1844 IFNET_FOREACH_CARP(ifp, sc)
1845 if (sc->sc_vhid == vhid)
1846 break;
1847 if (sc == NULL) {
1848 CIF_UNLOCK(cif);
1849 return (ENOENT);
1850 }
1851
1852 if (ifa->ifa_carp) {
1853 if (ifa->ifa_carp->sc_vhid != vhid)
1854 carp_detach_locked(ifa);
1855 else {
1856 CIF_UNLOCK(cif);
1857 return (0);
1858 }
1859 }
1860
1861 error = carp_multicast_setup(cif, ifa->ifa_addr->sa_family);
1862 if (error) {
1863 CIF_FREE(cif);
1864 return (error);
1865 }
1866
1867 CARP_LOCK(sc);
1868 index = sc->sc_naddrs + sc->sc_naddrs6 + 1;
1869 if (index > sc->sc_ifasiz / sizeof(struct ifaddr *))
1870 if ((error = carp_grow_ifas(sc)) != 0) {
1871 carp_multicast_cleanup(cif,
1872 ifa->ifa_addr->sa_family);
1873 CARP_UNLOCK(sc);
1874 CIF_FREE(cif);
1875 return (error);
1876 }
1877
1878 switch (ifa->ifa_addr->sa_family) {
1879 #ifdef INET
1880 case AF_INET:
1881 cif->cif_naddrs++;
1882 sc->sc_naddrs++;
1883 break;
1884 #endif
1885 #ifdef INET6
1886 case AF_INET6:
1887 cif->cif_naddrs6++;
1888 sc->sc_naddrs6++;
1889 break;
1890 #endif
1891 }
1892
1893 ifa_ref(ifa);
1894 sc->sc_ifas[index - 1] = ifa;
1895 ifa->ifa_carp = sc;
1896
1897 carp_hmac_prepare(sc);
1898 carp_sc_state(sc);
1899
1900 CARP_UNLOCK(sc);
1901 CIF_UNLOCK(cif);
1902
1903 return (0);
1904 }
1905
1906 void
1907 carp_detach(struct ifaddr *ifa)
1908 {
1909 struct ifnet *ifp = ifa->ifa_ifp;
1910 struct carp_if *cif = ifp->if_carp;
1911
1912 CIF_LOCK(cif);
1913 carp_detach_locked(ifa);
1914 CIF_FREE(cif);
1915 }
1916
1917 static void
1918 carp_detach_locked(struct ifaddr *ifa)
1919 {
1920 struct ifnet *ifp = ifa->ifa_ifp;
1921 struct carp_if *cif = ifp->if_carp;
1922 struct carp_softc *sc = ifa->ifa_carp;
1923 int i, index;
1924
1925 KASSERT(sc != NULL, ("%s: %p not attached", __func__, ifa));
1926
1927 CIF_LOCK_ASSERT(cif);
1928 CARP_LOCK(sc);
1929
1930 /* Shift array. */
1931 index = sc->sc_naddrs + sc->sc_naddrs6;
1932 for (i = 0; i < index; i++)
1933 if (sc->sc_ifas[i] == ifa)
1934 break;
1935 KASSERT(i < index, ("%s: %p no backref", __func__, ifa));
1936 for (; i < index - 1; i++)
1937 sc->sc_ifas[i] = sc->sc_ifas[i+1];
1938 sc->sc_ifas[index - 1] = NULL;
1939
1940 switch (ifa->ifa_addr->sa_family) {
1941 #ifdef INET
1942 case AF_INET:
1943 cif->cif_naddrs--;
1944 sc->sc_naddrs--;
1945 break;
1946 #endif
1947 #ifdef INET6
1948 case AF_INET6:
1949 cif->cif_naddrs6--;
1950 sc->sc_naddrs6--;
1951 break;
1952 #endif
1953 }
1954
1955 carp_ifa_delroute(ifa);
1956 carp_multicast_cleanup(cif, ifa->ifa_addr->sa_family);
1957
1958 ifa->ifa_carp = NULL;
1959 ifa_free(ifa);
1960
1961 carp_hmac_prepare(sc);
1962 carp_sc_state(sc);
1963
1964 if (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0) {
1965 CARP_UNLOCK(sc);
1966 carp_destroy(sc);
1967 } else
1968 CARP_UNLOCK(sc);
1969 }
1970
1971 static void
1972 carp_set_state(struct carp_softc *sc, int state)
1973 {
1974
1975 CARP_LOCK_ASSERT(sc);
1976
1977 if (sc->sc_state != state) {
1978 const char *carp_states[] = { CARP_STATES };
1979 char subsys[IFNAMSIZ+5];
1980
1981 sc->sc_state = state;
1982
1983 snprintf(subsys, IFNAMSIZ+5, "%u@%s", sc->sc_vhid,
1984 sc->sc_carpdev->if_xname);
1985 devctl_notify("CARP", subsys, carp_states[state], NULL);
1986 }
1987 }
1988
1989 static void
1990 carp_linkstate(struct ifnet *ifp)
1991 {
1992 struct carp_softc *sc;
1993
1994 CIF_LOCK(ifp->if_carp);
1995 IFNET_FOREACH_CARP(ifp, sc) {
1996 CARP_LOCK(sc);
1997 carp_sc_state(sc);
1998 CARP_UNLOCK(sc);
1999 }
2000 CIF_UNLOCK(ifp->if_carp);
2001 }
2002
2003 static void
2004 carp_sc_state(struct carp_softc *sc)
2005 {
2006
2007 CARP_LOCK_ASSERT(sc);
2008
2009 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP ||
2010 !(sc->sc_carpdev->if_flags & IFF_UP)) {
2011 callout_stop(&sc->sc_ad_tmo);
2012 #ifdef INET
2013 callout_stop(&sc->sc_md_tmo);
2014 #endif
2015 #ifdef INET6
2016 callout_stop(&sc->sc_md6_tmo);
2017 #endif
2018 carp_set_state(sc, INIT);
2019 carp_setrun(sc, 0);
2020 if (!sc->sc_suppress)
2021 carp_demote_adj(V_carp_ifdown_adj, "interface down");
2022 sc->sc_suppress = 1;
2023 } else {
2024 carp_set_state(sc, INIT);
2025 carp_setrun(sc, 0);
2026 if (sc->sc_suppress)
2027 carp_demote_adj(-V_carp_ifdown_adj, "interface up");
2028 sc->sc_suppress = 0;
2029 }
2030 }
2031
2032 static void
2033 carp_demote_adj(int adj, char *reason)
2034 {
2035 atomic_add_int(&V_carp_demotion, adj);
2036 CARP_LOG("demoted by %d to %d (%s)\n", adj, V_carp_demotion, reason);
2037 taskqueue_enqueue(taskqueue_swi, &carp_sendall_task);
2038 }
2039
2040 static int
2041 carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS)
2042 {
2043 int new, error;
2044
2045 new = V_carp_demotion;
2046 error = sysctl_handle_int(oidp, &new, 0, req);
2047 if (error || !req->newptr)
2048 return (error);
2049
2050 carp_demote_adj(new, "sysctl");
2051
2052 return (0);
2053 }
2054
2055 #ifdef INET
2056 extern struct domain inetdomain;
2057 static struct protosw in_carp_protosw = {
2058 .pr_type = SOCK_RAW,
2059 .pr_domain = &inetdomain,
2060 .pr_protocol = IPPROTO_CARP,
2061 .pr_flags = PR_ATOMIC|PR_ADDR,
2062 .pr_input = carp_input,
2063 .pr_output = (pr_output_t *)rip_output,
2064 .pr_ctloutput = rip_ctloutput,
2065 .pr_usrreqs = &rip_usrreqs
2066 };
2067 #endif
2068
2069 #ifdef INET6
2070 extern struct domain inet6domain;
2071 static struct ip6protosw in6_carp_protosw = {
2072 .pr_type = SOCK_RAW,
2073 .pr_domain = &inet6domain,
2074 .pr_protocol = IPPROTO_CARP,
2075 .pr_flags = PR_ATOMIC|PR_ADDR,
2076 .pr_input = carp6_input,
2077 .pr_output = rip6_output,
2078 .pr_ctloutput = rip6_ctloutput,
2079 .pr_usrreqs = &rip6_usrreqs
2080 };
2081 #endif
2082
2083 static void
2084 carp_mod_cleanup(void)
2085 {
2086
2087 #ifdef INET
2088 if (proto_reg[CARP_INET] == 0) {
2089 (void)ipproto_unregister(IPPROTO_CARP);
2090 pf_proto_unregister(PF_INET, IPPROTO_CARP, SOCK_RAW);
2091 proto_reg[CARP_INET] = -1;
2092 }
2093 carp_iamatch_p = NULL;
2094 #endif
2095 #ifdef INET6
2096 if (proto_reg[CARP_INET6] == 0) {
2097 (void)ip6proto_unregister(IPPROTO_CARP);
2098 pf_proto_unregister(PF_INET6, IPPROTO_CARP, SOCK_RAW);
2099 proto_reg[CARP_INET6] = -1;
2100 }
2101 carp_iamatch6_p = NULL;
2102 carp_macmatch6_p = NULL;
2103 #endif
2104 carp_ioctl_p = NULL;
2105 carp_attach_p = NULL;
2106 carp_detach_p = NULL;
2107 carp_get_vhid_p = NULL;
2108 carp_linkstate_p = NULL;
2109 carp_forus_p = NULL;
2110 carp_output_p = NULL;
2111 carp_demote_adj_p = NULL;
2112 carp_master_p = NULL;
2113 mtx_unlock(&carp_mtx);
2114 taskqueue_drain(taskqueue_swi, &carp_sendall_task);
2115 mtx_destroy(&carp_mtx);
2116 }
2117
2118 static int
2119 carp_mod_load(void)
2120 {
2121 int err;
2122
2123 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF);
2124 LIST_INIT(&carp_list);
2125 carp_get_vhid_p = carp_get_vhid;
2126 carp_forus_p = carp_forus;
2127 carp_output_p = carp_output;
2128 carp_linkstate_p = carp_linkstate;
2129 carp_ioctl_p = carp_ioctl;
2130 carp_attach_p = carp_attach;
2131 carp_detach_p = carp_detach;
2132 carp_demote_adj_p = carp_demote_adj;
2133 carp_master_p = carp_master;
2134 #ifdef INET6
2135 carp_iamatch6_p = carp_iamatch6;
2136 carp_macmatch6_p = carp_macmatch6;
2137 proto_reg[CARP_INET6] = pf_proto_register(PF_INET6,
2138 (struct protosw *)&in6_carp_protosw);
2139 if (proto_reg[CARP_INET6]) {
2140 printf("carp: error %d attaching to PF_INET6\n",
2141 proto_reg[CARP_INET6]);
2142 carp_mod_cleanup();
2143 return (proto_reg[CARP_INET6]);
2144 }
2145 err = ip6proto_register(IPPROTO_CARP);
2146 if (err) {
2147 printf("carp: error %d registering with INET6\n", err);
2148 carp_mod_cleanup();
2149 return (err);
2150 }
2151 #endif
2152 #ifdef INET
2153 carp_iamatch_p = carp_iamatch;
2154 proto_reg[CARP_INET] = pf_proto_register(PF_INET, &in_carp_protosw);
2155 if (proto_reg[CARP_INET]) {
2156 printf("carp: error %d attaching to PF_INET\n",
2157 proto_reg[CARP_INET]);
2158 carp_mod_cleanup();
2159 return (proto_reg[CARP_INET]);
2160 }
2161 err = ipproto_register(IPPROTO_CARP);
2162 if (err) {
2163 printf("carp: error %d registering with INET\n", err);
2164 carp_mod_cleanup();
2165 return (err);
2166 }
2167 #endif
2168 return (0);
2169 }
2170
2171 static int
2172 carp_modevent(module_t mod, int type, void *data)
2173 {
2174 switch (type) {
2175 case MOD_LOAD:
2176 return carp_mod_load();
2177 /* NOTREACHED */
2178 case MOD_UNLOAD:
2179 mtx_lock(&carp_mtx);
2180 if (LIST_EMPTY(&carp_list))
2181 carp_mod_cleanup();
2182 else {
2183 mtx_unlock(&carp_mtx);
2184 return (EBUSY);
2185 }
2186 break;
2187
2188 default:
2189 return (EINVAL);
2190 }
2191
2192 return (0);
2193 }
2194
2195 static moduledata_t carp_mod = {
2196 "carp",
2197 carp_modevent,
2198 0
2199 };
2200
2201 DECLARE_MODULE(carp, carp_mod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
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