FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_carp.c
1 /*
2 * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
3 * Copyright (c) 2003 Ryan McBride. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
18 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
20 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
22 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
23 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
24 * THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: releng/9.0/sys/netinet/ip_carp.c 226571 2011-10-20 15:55:01Z glebius $");
29
30 #include "opt_bpf.h"
31 #include "opt_inet.h"
32 #include "opt_inet6.h"
33
34 #include <sys/types.h>
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/conf.h>
38 #include <sys/kernel.h>
39 #include <sys/limits.h>
40 #include <sys/malloc.h>
41 #include <sys/mbuf.h>
42 #include <sys/module.h>
43 #include <sys/time.h>
44 #include <sys/priv.h>
45 #include <sys/proc.h>
46 #include <sys/protosw.h>
47 #include <sys/sysctl.h>
48 #include <sys/syslog.h>
49 #include <sys/signalvar.h>
50 #include <sys/filio.h>
51 #include <sys/sockio.h>
52
53 #include <sys/socket.h>
54 #include <sys/vnode.h>
55
56 #include <machine/stdarg.h>
57
58 #include <net/bpf.h>
59 #include <net/ethernet.h>
60 #include <net/fddi.h>
61 #include <net/iso88025.h>
62 #include <net/if.h>
63 #include <net/if_clone.h>
64 #include <net/if_dl.h>
65 #include <net/if_types.h>
66 #include <net/route.h>
67 #include <net/vnet.h>
68
69 #if defined(INET) || defined(INET6)
70 #include <netinet/in.h>
71 #include <netinet/in_var.h>
72 #include <netinet/ip_carp.h>
73 #include <netinet/ip.h>
74
75 #include <machine/in_cksum.h>
76 #endif
77
78 #ifdef INET
79 #include <netinet/in_systm.h>
80 #include <netinet/ip_var.h>
81 #include <netinet/if_ether.h>
82 #endif
83
84 #ifdef INET6
85 #include <netinet/icmp6.h>
86 #include <netinet/ip6.h>
87 #include <netinet6/ip6protosw.h>
88 #include <netinet6/ip6_var.h>
89 #include <netinet6/scope6_var.h>
90 #include <netinet6/in6_var.h>
91 #include <netinet6/nd6.h>
92 #endif
93
94 #include <crypto/sha1.h>
95
96 #define CARP_IFNAME "carp"
97 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces");
98 SYSCTL_DECL(_net_inet_carp);
99
100 struct carp_softc {
101 struct ifnet *sc_ifp; /* Interface clue */
102 struct ifnet *sc_carpdev; /* Pointer to parent interface */
103 struct in_ifaddr *sc_ia; /* primary iface address */
104 #ifdef INET
105 struct ip_moptions sc_imo;
106 #endif
107 #ifdef INET6
108 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */
109 struct ip6_moptions sc_im6o;
110 #endif /* INET6 */
111 TAILQ_ENTRY(carp_softc) sc_list;
112
113 enum { INIT = 0, BACKUP, MASTER } sc_state;
114
115 int sc_flags_backup;
116 int sc_suppress;
117
118 int sc_sendad_errors;
119 #define CARP_SENDAD_MAX_ERRORS 3
120 int sc_sendad_success;
121 #define CARP_SENDAD_MIN_SUCCESS 3
122
123 int sc_vhid;
124 int sc_advskew;
125 int sc_naddrs;
126 int sc_naddrs6;
127 int sc_advbase; /* seconds */
128 int sc_init_counter;
129 u_int64_t sc_counter;
130
131 /* authentication */
132 #define CARP_HMAC_PAD 64
133 unsigned char sc_key[CARP_KEY_LEN];
134 unsigned char sc_pad[CARP_HMAC_PAD];
135 SHA1_CTX sc_sha1;
136
137 struct callout sc_ad_tmo; /* advertisement timeout */
138 struct callout sc_md_tmo; /* master down timeout */
139 struct callout sc_md6_tmo; /* master down timeout */
140
141 LIST_ENTRY(carp_softc) sc_next; /* Interface clue */
142 };
143 #define SC2IFP(sc) ((sc)->sc_ifp)
144
145 int carp_suppress_preempt = 0;
146 int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */
147 SYSCTL_NODE(_net_inet, IPPROTO_CARP, carp, CTLFLAG_RW, 0, "CARP");
148 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW,
149 &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets");
150 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW,
151 &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode");
152 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW,
153 &carp_opts[CARPCTL_LOG], 0, "log bad carp packets");
154 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW,
155 &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses");
156 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD,
157 &carp_suppress_preempt, 0, "Preemption is suppressed");
158
159 struct carpstats carpstats;
160 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW,
161 &carpstats, carpstats,
162 "CARP statistics (struct carpstats, netinet/ip_carp.h)");
163
164 struct carp_if {
165 TAILQ_HEAD(, carp_softc) vhif_vrs;
166 int vhif_nvrs;
167
168 struct ifnet *vhif_ifp;
169 struct mtx vhif_mtx;
170 };
171
172 #define CARP_INET 0
173 #define CARP_INET6 1
174 static int proto_reg[] = {-1, -1};
175
176 /* Get carp_if from softc. Valid after carp_set_addr{,6}. */
177 #define SC2CIF(sc) ((struct carp_if *)(sc)->sc_carpdev->if_carp)
178
179 /* lock per carp_if queue */
180 #define CARP_LOCK_INIT(cif) mtx_init(&(cif)->vhif_mtx, "carp_if", \
181 NULL, MTX_DEF)
182 #define CARP_LOCK_DESTROY(cif) mtx_destroy(&(cif)->vhif_mtx)
183 #define CARP_LOCK_ASSERT(cif) mtx_assert(&(cif)->vhif_mtx, MA_OWNED)
184 #define CARP_LOCK(cif) mtx_lock(&(cif)->vhif_mtx)
185 #define CARP_UNLOCK(cif) mtx_unlock(&(cif)->vhif_mtx)
186
187 #define CARP_SCLOCK(sc) mtx_lock(&SC2CIF(sc)->vhif_mtx)
188 #define CARP_SCUNLOCK(sc) mtx_unlock(&SC2CIF(sc)->vhif_mtx)
189 #define CARP_SCLOCK_ASSERT(sc) mtx_assert(&SC2CIF(sc)->vhif_mtx, MA_OWNED)
190
191 #define CARP_LOG(...) do { \
192 if (carp_opts[CARPCTL_LOG] > 0) \
193 log(LOG_INFO, __VA_ARGS__); \
194 } while (0)
195
196 #define CARP_DEBUG(...) do { \
197 if (carp_opts[CARPCTL_LOG] > 1) \
198 log(LOG_DEBUG, __VA_ARGS__); \
199 } while (0)
200
201 static void carp_hmac_prepare(struct carp_softc *);
202 static void carp_hmac_generate(struct carp_softc *, u_int32_t *,
203 unsigned char *);
204 static int carp_hmac_verify(struct carp_softc *, u_int32_t *,
205 unsigned char *);
206 static void carp_setroute(struct carp_softc *, int);
207 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t);
208 static int carp_clone_create(struct if_clone *, int, caddr_t);
209 static void carp_clone_destroy(struct ifnet *);
210 static void carpdetach(struct carp_softc *, int);
211 static int carp_prepare_ad(struct mbuf *, struct carp_softc *,
212 struct carp_header *);
213 static void carp_send_ad_all(void);
214 static void carp_send_ad(void *);
215 static void carp_send_ad_locked(struct carp_softc *);
216 #ifdef INET
217 static void carp_send_arp(struct carp_softc *);
218 #endif
219 static void carp_master_down(void *);
220 static void carp_master_down_locked(struct carp_softc *);
221 static int carp_ioctl(struct ifnet *, u_long, caddr_t);
222 static int carp_looutput(struct ifnet *, struct mbuf *, struct sockaddr *,
223 struct route *);
224 static void carp_start(struct ifnet *);
225 static void carp_setrun(struct carp_softc *, sa_family_t);
226 static void carp_set_state(struct carp_softc *, int);
227 #ifdef INET
228 static int carp_addrcount(struct carp_if *, struct in_ifaddr *, int);
229 #endif
230 enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING };
231
232 #ifdef INET
233 static void carp_multicast_cleanup(struct carp_softc *, int dofree);
234 static int carp_set_addr(struct carp_softc *, struct sockaddr_in *);
235 static int carp_del_addr(struct carp_softc *, struct sockaddr_in *);
236 #endif
237 static void carp_carpdev_state_locked(struct carp_if *);
238 static void carp_sc_state_locked(struct carp_softc *);
239 #ifdef INET6
240 static void carp_send_na(struct carp_softc *);
241 static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *);
242 static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *);
243 static void carp_multicast6_cleanup(struct carp_softc *, int dofree);
244 #endif
245
246 static LIST_HEAD(, carp_softc) carpif_list;
247 static struct mtx carp_mtx;
248 IFC_SIMPLE_DECLARE(carp, 0);
249
250 static eventhandler_tag if_detach_event_tag;
251
252 static __inline u_int16_t
253 carp_cksum(struct mbuf *m, int len)
254 {
255 return (in_cksum(m, len));
256 }
257
258 static void
259 carp_hmac_prepare(struct carp_softc *sc)
260 {
261 u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
262 u_int8_t vhid = sc->sc_vhid & 0xff;
263 struct ifaddr *ifa;
264 int i, found;
265 #ifdef INET
266 struct in_addr last, cur, in;
267 #endif
268 #ifdef INET6
269 struct in6_addr last6, cur6, in6;
270 #endif
271
272 if (sc->sc_carpdev)
273 CARP_SCLOCK(sc);
274
275 /* XXX: possible race here */
276
277 /* compute ipad from key */
278 bzero(sc->sc_pad, sizeof(sc->sc_pad));
279 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
280 for (i = 0; i < sizeof(sc->sc_pad); i++)
281 sc->sc_pad[i] ^= 0x36;
282
283 /* precompute first part of inner hash */
284 SHA1Init(&sc->sc_sha1);
285 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
286 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
287 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
288 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
289 #ifdef INET
290 cur.s_addr = 0;
291 do {
292 found = 0;
293 last = cur;
294 cur.s_addr = 0xffffffff;
295 IF_ADDR_LOCK(SC2IFP(sc));
296 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
297 in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr;
298 if (ifa->ifa_addr->sa_family == AF_INET &&
299 ntohl(in.s_addr) > ntohl(last.s_addr) &&
300 ntohl(in.s_addr) < ntohl(cur.s_addr)) {
301 cur.s_addr = in.s_addr;
302 found++;
303 }
304 }
305 IF_ADDR_UNLOCK(SC2IFP(sc));
306 if (found)
307 SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur));
308 } while (found);
309 #endif /* INET */
310 #ifdef INET6
311 memset(&cur6, 0, sizeof(cur6));
312 do {
313 found = 0;
314 last6 = cur6;
315 memset(&cur6, 0xff, sizeof(cur6));
316 IF_ADDR_LOCK(SC2IFP(sc));
317 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
318 in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
319 if (IN6_IS_SCOPE_EMBED(&in6))
320 in6.s6_addr16[1] = 0;
321 if (ifa->ifa_addr->sa_family == AF_INET6 &&
322 memcmp(&in6, &last6, sizeof(in6)) > 0 &&
323 memcmp(&in6, &cur6, sizeof(in6)) < 0) {
324 cur6 = in6;
325 found++;
326 }
327 }
328 IF_ADDR_UNLOCK(SC2IFP(sc));
329 if (found)
330 SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6));
331 } while (found);
332 #endif /* INET6 */
333
334 /* convert ipad to opad */
335 for (i = 0; i < sizeof(sc->sc_pad); i++)
336 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
337
338 if (sc->sc_carpdev)
339 CARP_SCUNLOCK(sc);
340 }
341
342 static void
343 carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2],
344 unsigned char md[20])
345 {
346 SHA1_CTX sha1ctx;
347
348 /* fetch first half of inner hash */
349 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
350
351 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
352 SHA1Final(md, &sha1ctx);
353
354 /* outer hash */
355 SHA1Init(&sha1ctx);
356 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
357 SHA1Update(&sha1ctx, md, 20);
358 SHA1Final(md, &sha1ctx);
359 }
360
361 static int
362 carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2],
363 unsigned char md[20])
364 {
365 unsigned char md2[20];
366
367 CARP_SCLOCK_ASSERT(sc);
368
369 carp_hmac_generate(sc, counter, md2);
370
371 return (bcmp(md, md2, sizeof(md2)));
372 }
373
374 static void
375 carp_setroute(struct carp_softc *sc, int cmd)
376 {
377 struct ifaddr *ifa;
378 int s;
379
380 if (sc->sc_carpdev)
381 CARP_SCLOCK_ASSERT(sc);
382
383 s = splnet();
384 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
385 #ifdef INET
386 if (ifa->ifa_addr->sa_family == AF_INET &&
387 sc->sc_carpdev != NULL) {
388 int count = carp_addrcount(
389 (struct carp_if *)sc->sc_carpdev->if_carp,
390 ifatoia(ifa), CARP_COUNT_MASTER);
391
392 if ((cmd == RTM_ADD && count == 1) ||
393 (cmd == RTM_DELETE && count == 0))
394 rtinit(ifa, cmd, RTF_UP | RTF_HOST);
395 }
396 #endif
397 }
398 splx(s);
399 }
400
401 static int
402 carp_clone_create(struct if_clone *ifc, int unit, caddr_t params)
403 {
404
405 struct carp_softc *sc;
406 struct ifnet *ifp;
407
408 sc = malloc(sizeof(*sc), M_CARP, M_WAITOK|M_ZERO);
409 ifp = SC2IFP(sc) = if_alloc(IFT_ETHER);
410 if (ifp == NULL) {
411 free(sc, M_CARP);
412 return (ENOSPC);
413 }
414
415 sc->sc_flags_backup = 0;
416 sc->sc_suppress = 0;
417 sc->sc_advbase = CARP_DFLTINTV;
418 sc->sc_vhid = -1; /* required setting */
419 sc->sc_advskew = 0;
420 sc->sc_init_counter = 1;
421 sc->sc_naddrs = sc->sc_naddrs6 = 0; /* M_ZERO? */
422 #ifdef INET
423 sc->sc_imo.imo_membership = (struct in_multi **)malloc(
424 (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP,
425 M_WAITOK);
426 sc->sc_imo.imo_mfilters = NULL;
427 sc->sc_imo.imo_max_memberships = IP_MIN_MEMBERSHIPS;
428 sc->sc_imo.imo_multicast_vif = -1;
429 #endif
430 #ifdef INET6
431 sc->sc_im6o.im6o_membership = (struct in6_multi **)malloc(
432 (sizeof(struct in6_multi *) * IPV6_MIN_MEMBERSHIPS), M_CARP,
433 M_WAITOK);
434 sc->sc_im6o.im6o_mfilters = NULL;
435 sc->sc_im6o.im6o_max_memberships = IPV6_MIN_MEMBERSHIPS;
436 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
437 #endif
438
439 callout_init(&sc->sc_ad_tmo, CALLOUT_MPSAFE);
440 callout_init(&sc->sc_md_tmo, CALLOUT_MPSAFE);
441 callout_init(&sc->sc_md6_tmo, CALLOUT_MPSAFE);
442
443 ifp->if_softc = sc;
444 if_initname(ifp, CARP_IFNAME, unit);
445 ifp->if_mtu = ETHERMTU;
446 ifp->if_flags = IFF_LOOPBACK;
447 ifp->if_ioctl = carp_ioctl;
448 ifp->if_output = carp_looutput;
449 ifp->if_start = carp_start;
450 ifp->if_type = IFT_CARP;
451 ifp->if_snd.ifq_maxlen = ifqmaxlen;
452 ifp->if_hdrlen = 0;
453 if_attach(ifp);
454 bpfattach(SC2IFP(sc), DLT_NULL, sizeof(u_int32_t));
455 mtx_lock(&carp_mtx);
456 LIST_INSERT_HEAD(&carpif_list, sc, sc_next);
457 mtx_unlock(&carp_mtx);
458 return (0);
459 }
460
461 static void
462 carp_clone_destroy(struct ifnet *ifp)
463 {
464 struct carp_softc *sc = ifp->if_softc;
465
466 if (sc->sc_carpdev)
467 CARP_SCLOCK(sc);
468 carpdetach(sc, 1); /* Returns unlocked. */
469
470 mtx_lock(&carp_mtx);
471 LIST_REMOVE(sc, sc_next);
472 mtx_unlock(&carp_mtx);
473 bpfdetach(ifp);
474 if_detach(ifp);
475 if_free_type(ifp, IFT_ETHER);
476 #ifdef INET
477 free(sc->sc_imo.imo_membership, M_CARP);
478 #endif
479 #ifdef INET6
480 free(sc->sc_im6o.im6o_membership, M_CARP);
481 #endif
482 free(sc, M_CARP);
483 }
484
485 /*
486 * This function can be called on CARP interface destroy path,
487 * and in case of the removal of the underlying interface as
488 * well. We differentiate these two cases: in case of destruction
489 * of the underlying interface, we do not cleanup our multicast
490 * memberships, since they are already freed. But we purge pointers
491 * to multicast structures, since they are no longer valid, to
492 * avoid panic in future calls to carpdetach(). Also, we do not
493 * release the lock on return, because the function will be
494 * called once more, for another CARP instance on the same
495 * interface.
496 */
497 static void
498 carpdetach(struct carp_softc *sc, int unlock)
499 {
500 struct carp_if *cif;
501
502 callout_stop(&sc->sc_ad_tmo);
503 callout_stop(&sc->sc_md_tmo);
504 callout_stop(&sc->sc_md6_tmo);
505
506 if (sc->sc_suppress)
507 carp_suppress_preempt--;
508 sc->sc_suppress = 0;
509
510 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
511 carp_suppress_preempt--;
512 sc->sc_sendad_errors = 0;
513
514 carp_set_state(sc, INIT);
515 SC2IFP(sc)->if_flags &= ~IFF_UP;
516 carp_setrun(sc, 0);
517 #ifdef INET
518 carp_multicast_cleanup(sc, unlock);
519 #endif
520 #ifdef INET6
521 carp_multicast6_cleanup(sc, unlock);
522 #endif
523
524 if (sc->sc_carpdev != NULL) {
525 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
526 CARP_LOCK_ASSERT(cif);
527 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
528 if (!--cif->vhif_nvrs) {
529 ifpromisc(sc->sc_carpdev, 0);
530 sc->sc_carpdev->if_carp = NULL;
531 CARP_LOCK_DESTROY(cif);
532 free(cif, M_CARP);
533 } else if (unlock)
534 CARP_UNLOCK(cif);
535 sc->sc_carpdev = NULL;
536 }
537 }
538
539 /* Detach an interface from the carp. */
540 static void
541 carp_ifdetach(void *arg __unused, struct ifnet *ifp)
542 {
543 struct carp_if *cif = (struct carp_if *)ifp->if_carp;
544 struct carp_softc *sc, *nextsc;
545
546 if (cif == NULL)
547 return;
548
549 /*
550 * XXX: At the end of for() cycle the lock will be destroyed.
551 */
552 CARP_LOCK(cif);
553 for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) {
554 nextsc = TAILQ_NEXT(sc, sc_list);
555 carpdetach(sc, 0);
556 }
557 }
558
559 /*
560 * process input packet.
561 * we have rearranged checks order compared to the rfc,
562 * but it seems more efficient this way or not possible otherwise.
563 */
564 #ifdef INET
565 void
566 carp_input(struct mbuf *m, int hlen)
567 {
568 struct ip *ip = mtod(m, struct ip *);
569 struct carp_header *ch;
570 int iplen, len;
571
572 CARPSTATS_INC(carps_ipackets);
573
574 if (!carp_opts[CARPCTL_ALLOW]) {
575 m_freem(m);
576 return;
577 }
578
579 /* check if received on a valid carp interface */
580 if (m->m_pkthdr.rcvif->if_carp == NULL) {
581 CARPSTATS_INC(carps_badif);
582 CARP_DEBUG("carp_input: packet received on non-carp "
583 "interface: %s\n",
584 m->m_pkthdr.rcvif->if_xname);
585 m_freem(m);
586 return;
587 }
588
589 /* verify that the IP TTL is 255. */
590 if (ip->ip_ttl != CARP_DFLTTL) {
591 CARPSTATS_INC(carps_badttl);
592 CARP_DEBUG("carp_input: received ttl %d != 255 on %s\n",
593 ip->ip_ttl,
594 m->m_pkthdr.rcvif->if_xname);
595 m_freem(m);
596 return;
597 }
598
599 iplen = ip->ip_hl << 2;
600
601 if (m->m_pkthdr.len < iplen + sizeof(*ch)) {
602 CARPSTATS_INC(carps_badlen);
603 CARP_DEBUG("carp_input: received len %zd < "
604 "sizeof(struct carp_header) on %s\n",
605 m->m_len - sizeof(struct ip),
606 m->m_pkthdr.rcvif->if_xname);
607 m_freem(m);
608 return;
609 }
610
611 if (iplen + sizeof(*ch) < m->m_len) {
612 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) {
613 CARPSTATS_INC(carps_hdrops);
614 CARP_DEBUG("carp_input: pullup failed\n");
615 return;
616 }
617 ip = mtod(m, struct ip *);
618 }
619 ch = (struct carp_header *)((char *)ip + iplen);
620
621 /*
622 * verify that the received packet length is
623 * equal to the CARP header
624 */
625 len = iplen + sizeof(*ch);
626 if (len > m->m_pkthdr.len) {
627 CARPSTATS_INC(carps_badlen);
628 CARP_DEBUG("carp_input: packet too short %d on %s\n",
629 m->m_pkthdr.len,
630 m->m_pkthdr.rcvif->if_xname);
631 m_freem(m);
632 return;
633 }
634
635 if ((m = m_pullup(m, len)) == NULL) {
636 CARPSTATS_INC(carps_hdrops);
637 return;
638 }
639 ip = mtod(m, struct ip *);
640 ch = (struct carp_header *)((char *)ip + iplen);
641
642 /* verify the CARP checksum */
643 m->m_data += iplen;
644 if (carp_cksum(m, len - iplen)) {
645 CARPSTATS_INC(carps_badsum);
646 CARP_DEBUG("carp_input: checksum failed on %s\n",
647 m->m_pkthdr.rcvif->if_xname);
648 m_freem(m);
649 return;
650 }
651 m->m_data -= iplen;
652
653 carp_input_c(m, ch, AF_INET);
654 }
655 #endif
656
657 #ifdef INET6
658 int
659 carp6_input(struct mbuf **mp, int *offp, int proto)
660 {
661 struct mbuf *m = *mp;
662 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
663 struct carp_header *ch;
664 u_int len;
665
666 CARPSTATS_INC(carps_ipackets6);
667
668 if (!carp_opts[CARPCTL_ALLOW]) {
669 m_freem(m);
670 return (IPPROTO_DONE);
671 }
672
673 /* check if received on a valid carp interface */
674 if (m->m_pkthdr.rcvif->if_carp == NULL) {
675 CARPSTATS_INC(carps_badif);
676 CARP_DEBUG("carp6_input: packet received on non-carp "
677 "interface: %s\n",
678 m->m_pkthdr.rcvif->if_xname);
679 m_freem(m);
680 return (IPPROTO_DONE);
681 }
682
683 /* verify that the IP TTL is 255 */
684 if (ip6->ip6_hlim != CARP_DFLTTL) {
685 CARPSTATS_INC(carps_badttl);
686 CARP_DEBUG("carp6_input: received ttl %d != 255 on %s\n",
687 ip6->ip6_hlim,
688 m->m_pkthdr.rcvif->if_xname);
689 m_freem(m);
690 return (IPPROTO_DONE);
691 }
692
693 /* verify that we have a complete carp packet */
694 len = m->m_len;
695 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
696 if (ch == NULL) {
697 CARPSTATS_INC(carps_badlen);
698 CARP_DEBUG("carp6_input: packet size %u too small\n", len);
699 return (IPPROTO_DONE);
700 }
701
702
703 /* verify the CARP checksum */
704 m->m_data += *offp;
705 if (carp_cksum(m, sizeof(*ch))) {
706 CARPSTATS_INC(carps_badsum);
707 CARP_DEBUG("carp6_input: checksum failed, on %s\n",
708 m->m_pkthdr.rcvif->if_xname);
709 m_freem(m);
710 return (IPPROTO_DONE);
711 }
712 m->m_data -= *offp;
713
714 carp_input_c(m, ch, AF_INET6);
715 return (IPPROTO_DONE);
716 }
717 #endif /* INET6 */
718
719 static void
720 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af)
721 {
722 struct ifnet *ifp = m->m_pkthdr.rcvif;
723 struct carp_softc *sc;
724 u_int64_t tmp_counter;
725 struct timeval sc_tv, ch_tv;
726
727 /* verify that the VHID is valid on the receiving interface */
728 CARP_LOCK(ifp->if_carp);
729 TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list)
730 if (sc->sc_vhid == ch->carp_vhid)
731 break;
732
733 if (!sc || !((SC2IFP(sc)->if_flags & IFF_UP) &&
734 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) {
735 CARPSTATS_INC(carps_badvhid);
736 CARP_UNLOCK(ifp->if_carp);
737 m_freem(m);
738 return;
739 }
740
741 getmicrotime(&SC2IFP(sc)->if_lastchange);
742 SC2IFP(sc)->if_ipackets++;
743 SC2IFP(sc)->if_ibytes += m->m_pkthdr.len;
744
745 if (bpf_peers_present(SC2IFP(sc)->if_bpf)) {
746 uint32_t af1 = af;
747 #ifdef INET
748 struct ip *ip = mtod(m, struct ip *);
749
750 /* BPF wants net byte order */
751 if (af == AF_INET) {
752 ip->ip_len = htons(ip->ip_len + (ip->ip_hl << 2));
753 ip->ip_off = htons(ip->ip_off);
754 }
755 #endif
756 bpf_mtap2(SC2IFP(sc)->if_bpf, &af1, sizeof(af1), m);
757 }
758
759 /* verify the CARP version. */
760 if (ch->carp_version != CARP_VERSION) {
761 CARPSTATS_INC(carps_badver);
762 SC2IFP(sc)->if_ierrors++;
763 CARP_UNLOCK(ifp->if_carp);
764 CARP_DEBUG("%s; invalid version %d\n",
765 SC2IFP(sc)->if_xname,
766 ch->carp_version);
767 m_freem(m);
768 return;
769 }
770
771 /* verify the hash */
772 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
773 CARPSTATS_INC(carps_badauth);
774 SC2IFP(sc)->if_ierrors++;
775 CARP_UNLOCK(ifp->if_carp);
776 CARP_DEBUG("%s: incorrect hash\n", SC2IFP(sc)->if_xname);
777 m_freem(m);
778 return;
779 }
780
781 tmp_counter = ntohl(ch->carp_counter[0]);
782 tmp_counter = tmp_counter<<32;
783 tmp_counter += ntohl(ch->carp_counter[1]);
784
785 /* XXX Replay protection goes here */
786
787 sc->sc_init_counter = 0;
788 sc->sc_counter = tmp_counter;
789
790 sc_tv.tv_sec = sc->sc_advbase;
791 if (carp_suppress_preempt && sc->sc_advskew < 240)
792 sc_tv.tv_usec = 240 * 1000000 / 256;
793 else
794 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256;
795 ch_tv.tv_sec = ch->carp_advbase;
796 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
797
798 switch (sc->sc_state) {
799 case INIT:
800 break;
801 case MASTER:
802 /*
803 * If we receive an advertisement from a master who's going to
804 * be more frequent than us, go into BACKUP state.
805 */
806 if (timevalcmp(&sc_tv, &ch_tv, >) ||
807 timevalcmp(&sc_tv, &ch_tv, ==)) {
808 callout_stop(&sc->sc_ad_tmo);
809 CARP_LOG("%s: MASTER -> BACKUP "
810 "(more frequent advertisement received)\n",
811 SC2IFP(sc)->if_xname);
812 carp_set_state(sc, BACKUP);
813 carp_setrun(sc, 0);
814 carp_setroute(sc, RTM_DELETE);
815 }
816 break;
817 case BACKUP:
818 /*
819 * If we're pre-empting masters who advertise slower than us,
820 * and this one claims to be slower, treat him as down.
821 */
822 if (carp_opts[CARPCTL_PREEMPT] &&
823 timevalcmp(&sc_tv, &ch_tv, <)) {
824 CARP_LOG("%s: BACKUP -> MASTER "
825 "(preempting a slower master)\n",
826 SC2IFP(sc)->if_xname);
827 carp_master_down_locked(sc);
828 break;
829 }
830
831 /*
832 * If the master is going to advertise at such a low frequency
833 * that he's guaranteed to time out, we'd might as well just
834 * treat him as timed out now.
835 */
836 sc_tv.tv_sec = sc->sc_advbase * 3;
837 if (timevalcmp(&sc_tv, &ch_tv, <)) {
838 CARP_LOG("%s: BACKUP -> MASTER "
839 "(master timed out)\n",
840 SC2IFP(sc)->if_xname);
841 carp_master_down_locked(sc);
842 break;
843 }
844
845 /*
846 * Otherwise, we reset the counter and wait for the next
847 * advertisement.
848 */
849 carp_setrun(sc, af);
850 break;
851 }
852
853 CARP_UNLOCK(ifp->if_carp);
854
855 m_freem(m);
856 return;
857 }
858
859 static int
860 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch)
861 {
862 struct m_tag *mtag;
863 struct ifnet *ifp = SC2IFP(sc);
864
865 if (sc->sc_init_counter) {
866 /* this could also be seconds since unix epoch */
867 sc->sc_counter = arc4random();
868 sc->sc_counter = sc->sc_counter << 32;
869 sc->sc_counter += arc4random();
870 } else
871 sc->sc_counter++;
872
873 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff);
874 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff);
875
876 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
877
878 /* Tag packet for carp_output */
879 mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct ifnet *), M_NOWAIT);
880 if (mtag == NULL) {
881 m_freem(m);
882 SC2IFP(sc)->if_oerrors++;
883 return (ENOMEM);
884 }
885 bcopy(&ifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *));
886 m_tag_prepend(m, mtag);
887
888 return (0);
889 }
890
891 static void
892 carp_send_ad_all(void)
893 {
894 struct carp_softc *sc;
895
896 mtx_lock(&carp_mtx);
897 LIST_FOREACH(sc, &carpif_list, sc_next) {
898 if (sc->sc_carpdev == NULL)
899 continue;
900 CARP_SCLOCK(sc);
901 if ((SC2IFP(sc)->if_flags & IFF_UP) &&
902 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING) &&
903 sc->sc_state == MASTER)
904 carp_send_ad_locked(sc);
905 CARP_SCUNLOCK(sc);
906 }
907 mtx_unlock(&carp_mtx);
908 }
909
910 static void
911 carp_send_ad(void *v)
912 {
913 struct carp_softc *sc = v;
914
915 CARP_SCLOCK(sc);
916 carp_send_ad_locked(sc);
917 CARP_SCUNLOCK(sc);
918 }
919
920 static void
921 carp_send_ad_locked(struct carp_softc *sc)
922 {
923 struct carp_header ch;
924 struct timeval tv;
925 struct carp_header *ch_ptr;
926 struct mbuf *m;
927 int len, advbase, advskew;
928
929 CARP_SCLOCK_ASSERT(sc);
930
931 /* bow out if we've lost our UPness or RUNNINGuiness */
932 if (!((SC2IFP(sc)->if_flags & IFF_UP) &&
933 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) {
934 advbase = 255;
935 advskew = 255;
936 } else {
937 advbase = sc->sc_advbase;
938 if (!carp_suppress_preempt || sc->sc_advskew > 240)
939 advskew = sc->sc_advskew;
940 else
941 advskew = 240;
942 tv.tv_sec = advbase;
943 tv.tv_usec = advskew * 1000000 / 256;
944 }
945
946 ch.carp_version = CARP_VERSION;
947 ch.carp_type = CARP_ADVERTISEMENT;
948 ch.carp_vhid = sc->sc_vhid;
949 ch.carp_advbase = advbase;
950 ch.carp_advskew = advskew;
951 ch.carp_authlen = 7; /* XXX DEFINE */
952 ch.carp_pad1 = 0; /* must be zero */
953 ch.carp_cksum = 0;
954
955 #ifdef INET
956 if (sc->sc_ia) {
957 struct ip *ip;
958
959 MGETHDR(m, M_DONTWAIT, MT_HEADER);
960 if (m == NULL) {
961 SC2IFP(sc)->if_oerrors++;
962 CARPSTATS_INC(carps_onomem);
963 /* XXX maybe less ? */
964 if (advbase != 255 || advskew != 255)
965 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
966 carp_send_ad, sc);
967 return;
968 }
969 len = sizeof(*ip) + sizeof(ch);
970 m->m_pkthdr.len = len;
971 m->m_pkthdr.rcvif = NULL;
972 m->m_len = len;
973 MH_ALIGN(m, m->m_len);
974 m->m_flags |= M_MCAST;
975 ip = mtod(m, struct ip *);
976 ip->ip_v = IPVERSION;
977 ip->ip_hl = sizeof(*ip) >> 2;
978 ip->ip_tos = IPTOS_LOWDELAY;
979 ip->ip_len = len;
980 ip->ip_id = ip_newid();
981 ip->ip_off = IP_DF;
982 ip->ip_ttl = CARP_DFLTTL;
983 ip->ip_p = IPPROTO_CARP;
984 ip->ip_sum = 0;
985 ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr;
986 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
987
988 ch_ptr = (struct carp_header *)(&ip[1]);
989 bcopy(&ch, ch_ptr, sizeof(ch));
990 if (carp_prepare_ad(m, sc, ch_ptr))
991 return;
992
993 m->m_data += sizeof(*ip);
994 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip));
995 m->m_data -= sizeof(*ip);
996
997 getmicrotime(&SC2IFP(sc)->if_lastchange);
998 SC2IFP(sc)->if_opackets++;
999 SC2IFP(sc)->if_obytes += len;
1000 CARPSTATS_INC(carps_opackets);
1001
1002 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) {
1003 SC2IFP(sc)->if_oerrors++;
1004 if (sc->sc_sendad_errors < INT_MAX)
1005 sc->sc_sendad_errors++;
1006 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1007 carp_suppress_preempt++;
1008 if (carp_suppress_preempt == 1) {
1009 CARP_SCUNLOCK(sc);
1010 carp_send_ad_all();
1011 CARP_SCLOCK(sc);
1012 }
1013 }
1014 sc->sc_sendad_success = 0;
1015 } else {
1016 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1017 if (++sc->sc_sendad_success >=
1018 CARP_SENDAD_MIN_SUCCESS) {
1019 carp_suppress_preempt--;
1020 sc->sc_sendad_errors = 0;
1021 }
1022 } else
1023 sc->sc_sendad_errors = 0;
1024 }
1025 }
1026 #endif /* INET */
1027 #ifdef INET6
1028 if (sc->sc_ia6) {
1029 struct ip6_hdr *ip6;
1030
1031 MGETHDR(m, M_DONTWAIT, MT_HEADER);
1032 if (m == NULL) {
1033 SC2IFP(sc)->if_oerrors++;
1034 CARPSTATS_INC(carps_onomem);
1035 /* XXX maybe less ? */
1036 if (advbase != 255 || advskew != 255)
1037 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1038 carp_send_ad, sc);
1039 return;
1040 }
1041 len = sizeof(*ip6) + sizeof(ch);
1042 m->m_pkthdr.len = len;
1043 m->m_pkthdr.rcvif = NULL;
1044 m->m_len = len;
1045 MH_ALIGN(m, m->m_len);
1046 m->m_flags |= M_MCAST;
1047 ip6 = mtod(m, struct ip6_hdr *);
1048 bzero(ip6, sizeof(*ip6));
1049 ip6->ip6_vfc |= IPV6_VERSION;
1050 ip6->ip6_hlim = CARP_DFLTTL;
1051 ip6->ip6_nxt = IPPROTO_CARP;
1052 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src,
1053 sizeof(struct in6_addr));
1054 /* set the multicast destination */
1055
1056 ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
1057 ip6->ip6_dst.s6_addr8[15] = 0x12;
1058 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
1059 SC2IFP(sc)->if_oerrors++;
1060 m_freem(m);
1061 CARP_DEBUG("%s: in6_setscope failed\n", __func__);
1062 return;
1063 }
1064
1065 ch_ptr = (struct carp_header *)(&ip6[1]);
1066 bcopy(&ch, ch_ptr, sizeof(ch));
1067 if (carp_prepare_ad(m, sc, ch_ptr))
1068 return;
1069
1070 m->m_data += sizeof(*ip6);
1071 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6));
1072 m->m_data -= sizeof(*ip6);
1073
1074 getmicrotime(&SC2IFP(sc)->if_lastchange);
1075 SC2IFP(sc)->if_opackets++;
1076 SC2IFP(sc)->if_obytes += len;
1077 CARPSTATS_INC(carps_opackets6);
1078
1079 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) {
1080 SC2IFP(sc)->if_oerrors++;
1081 if (sc->sc_sendad_errors < INT_MAX)
1082 sc->sc_sendad_errors++;
1083 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1084 carp_suppress_preempt++;
1085 if (carp_suppress_preempt == 1) {
1086 CARP_SCUNLOCK(sc);
1087 carp_send_ad_all();
1088 CARP_SCLOCK(sc);
1089 }
1090 }
1091 sc->sc_sendad_success = 0;
1092 } else {
1093 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1094 if (++sc->sc_sendad_success >=
1095 CARP_SENDAD_MIN_SUCCESS) {
1096 carp_suppress_preempt--;
1097 sc->sc_sendad_errors = 0;
1098 }
1099 } else
1100 sc->sc_sendad_errors = 0;
1101 }
1102 }
1103 #endif /* INET6 */
1104
1105 if (advbase != 255 || advskew != 255)
1106 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1107 carp_send_ad, sc);
1108
1109 }
1110
1111 #ifdef INET
1112 /*
1113 * Broadcast a gratuitous ARP request containing
1114 * the virtual router MAC address for each IP address
1115 * associated with the virtual router.
1116 */
1117 static void
1118 carp_send_arp(struct carp_softc *sc)
1119 {
1120 struct ifaddr *ifa;
1121
1122 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1123
1124 if (ifa->ifa_addr->sa_family != AF_INET)
1125 continue;
1126
1127 /* arprequest(sc->sc_carpdev, &in, &in, IF_LLADDR(sc->sc_ifp)); */
1128 arp_ifinit2(sc->sc_carpdev, ifa, IF_LLADDR(sc->sc_ifp));
1129
1130 DELAY(1000); /* XXX */
1131 }
1132 }
1133 #endif
1134
1135 #ifdef INET6
1136 static void
1137 carp_send_na(struct carp_softc *sc)
1138 {
1139 struct ifaddr *ifa;
1140 struct in6_addr *in6;
1141 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1142
1143 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1144
1145 if (ifa->ifa_addr->sa_family != AF_INET6)
1146 continue;
1147
1148 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
1149 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1150 ND_NA_FLAG_OVERRIDE, 1, NULL);
1151 DELAY(1000); /* XXX */
1152 }
1153 }
1154 #endif /* INET6 */
1155
1156 #ifdef INET
1157 static int
1158 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type)
1159 {
1160 struct carp_softc *vh;
1161 struct ifaddr *ifa;
1162 int count = 0;
1163
1164 CARP_LOCK_ASSERT(cif);
1165
1166 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1167 if ((type == CARP_COUNT_RUNNING &&
1168 (SC2IFP(vh)->if_flags & IFF_UP) &&
1169 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) ||
1170 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) {
1171 IF_ADDR_LOCK(SC2IFP(vh));
1172 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist,
1173 ifa_list) {
1174 if (ifa->ifa_addr->sa_family == AF_INET &&
1175 ia->ia_addr.sin_addr.s_addr ==
1176 ifatoia(ifa)->ia_addr.sin_addr.s_addr)
1177 count++;
1178 }
1179 IF_ADDR_UNLOCK(SC2IFP(vh));
1180 }
1181 }
1182 return (count);
1183 }
1184
1185 int
1186 carp_iamatch(struct ifnet *ifp, struct in_ifaddr *ia,
1187 struct in_addr *isaddr, u_int8_t **enaddr)
1188 {
1189 struct carp_if *cif;
1190 struct carp_softc *vh;
1191 int index, count = 0;
1192 struct ifaddr *ifa;
1193
1194 cif = ifp->if_carp;
1195 CARP_LOCK(cif);
1196
1197 if (carp_opts[CARPCTL_ARPBALANCE]) {
1198 /*
1199 * XXX proof of concept implementation.
1200 * We use the source ip to decide which virtual host should
1201 * handle the request. If we're master of that virtual host,
1202 * then we respond, otherwise, just drop the arp packet on
1203 * the floor.
1204 */
1205 count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING);
1206 if (count == 0) {
1207 /* should never reach this */
1208 CARP_UNLOCK(cif);
1209 return (0);
1210 }
1211
1212 /* this should be a hash, like pf_hash() */
1213 index = ntohl(isaddr->s_addr) % count;
1214 count = 0;
1215
1216 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1217 if ((SC2IFP(vh)->if_flags & IFF_UP) &&
1218 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) {
1219 IF_ADDR_LOCK(SC2IFP(vh));
1220 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist,
1221 ifa_list) {
1222 if (ifa->ifa_addr->sa_family ==
1223 AF_INET &&
1224 ia->ia_addr.sin_addr.s_addr ==
1225 ifatoia(ifa)->ia_addr.sin_addr.s_addr) {
1226 if (count == index) {
1227 if (vh->sc_state ==
1228 MASTER) {
1229 *enaddr = IF_LLADDR(vh->sc_ifp);
1230 IF_ADDR_UNLOCK(SC2IFP(vh));
1231 CARP_UNLOCK(cif);
1232 return (1);
1233 } else {
1234 IF_ADDR_UNLOCK(SC2IFP(vh));
1235 CARP_UNLOCK(cif);
1236 return (0);
1237 }
1238 }
1239 count++;
1240 }
1241 }
1242 IF_ADDR_UNLOCK(SC2IFP(vh));
1243 }
1244 }
1245 } else {
1246 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1247 if ((SC2IFP(vh)->if_flags & IFF_UP) &&
1248 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
1249 ia->ia_ifp == SC2IFP(vh) &&
1250 vh->sc_state == MASTER) {
1251 *enaddr = IF_LLADDR(vh->sc_ifp);
1252 CARP_UNLOCK(cif);
1253 return (1);
1254 }
1255 }
1256 }
1257 CARP_UNLOCK(cif);
1258 return (0);
1259 }
1260 #endif
1261
1262 #ifdef INET6
1263 struct ifaddr *
1264 carp_iamatch6(struct ifnet *ifp, struct in6_addr *taddr)
1265 {
1266 struct carp_if *cif;
1267 struct carp_softc *vh;
1268 struct ifaddr *ifa;
1269
1270 cif = ifp->if_carp;
1271 CARP_LOCK(cif);
1272 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1273 IF_ADDR_LOCK(SC2IFP(vh));
1274 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, ifa_list) {
1275 if (IN6_ARE_ADDR_EQUAL(taddr,
1276 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1277 (SC2IFP(vh)->if_flags & IFF_UP) &&
1278 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
1279 vh->sc_state == MASTER) {
1280 ifa_ref(ifa);
1281 IF_ADDR_UNLOCK(SC2IFP(vh));
1282 CARP_UNLOCK(cif);
1283 return (ifa);
1284 }
1285 }
1286 IF_ADDR_UNLOCK(SC2IFP(vh));
1287 }
1288 CARP_UNLOCK(cif);
1289
1290 return (NULL);
1291 }
1292
1293 caddr_t
1294 carp_macmatch6(struct ifnet *ifp, struct mbuf *m, const struct in6_addr *taddr)
1295 {
1296 struct m_tag *mtag;
1297 struct carp_if *cif;
1298 struct carp_softc *sc;
1299 struct ifaddr *ifa;
1300
1301 cif = ifp->if_carp;
1302 CARP_LOCK(cif);
1303 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
1304 IF_ADDR_LOCK(SC2IFP(sc));
1305 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1306 if (IN6_ARE_ADDR_EQUAL(taddr,
1307 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1308 (SC2IFP(sc)->if_flags & IFF_UP) &&
1309 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING)) {
1310 struct ifnet *ifp = SC2IFP(sc);
1311 mtag = m_tag_get(PACKET_TAG_CARP,
1312 sizeof(struct ifnet *), M_NOWAIT);
1313 if (mtag == NULL) {
1314 /* better a bit than nothing */
1315 IF_ADDR_UNLOCK(SC2IFP(sc));
1316 CARP_UNLOCK(cif);
1317 return (IF_LLADDR(sc->sc_ifp));
1318 }
1319 bcopy(&ifp, (caddr_t)(mtag + 1),
1320 sizeof(struct ifnet *));
1321 m_tag_prepend(m, mtag);
1322
1323 IF_ADDR_UNLOCK(SC2IFP(sc));
1324 CARP_UNLOCK(cif);
1325 return (IF_LLADDR(sc->sc_ifp));
1326 }
1327 }
1328 IF_ADDR_UNLOCK(SC2IFP(sc));
1329 }
1330 CARP_UNLOCK(cif);
1331
1332 return (NULL);
1333 }
1334 #endif
1335
1336 struct ifnet *
1337 carp_forus(struct ifnet *ifp, u_char *dhost)
1338 {
1339 struct carp_if *cif;
1340 struct carp_softc *vh;
1341 u_int8_t *ena = dhost;
1342
1343 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
1344 return (NULL);
1345
1346 cif = ifp->if_carp;
1347 CARP_LOCK(cif);
1348 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list)
1349 if ((SC2IFP(vh)->if_flags & IFF_UP) &&
1350 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
1351 vh->sc_state == MASTER &&
1352 !bcmp(dhost, IF_LLADDR(vh->sc_ifp), ETHER_ADDR_LEN)) {
1353 CARP_UNLOCK(cif);
1354 return (SC2IFP(vh));
1355 }
1356
1357 CARP_UNLOCK(cif);
1358 return (NULL);
1359 }
1360
1361 static void
1362 carp_master_down(void *v)
1363 {
1364 struct carp_softc *sc = v;
1365
1366 CARP_SCLOCK(sc);
1367 carp_master_down_locked(sc);
1368 CARP_SCUNLOCK(sc);
1369 }
1370
1371 static void
1372 carp_master_down_locked(struct carp_softc *sc)
1373 {
1374 if (sc->sc_carpdev)
1375 CARP_SCLOCK_ASSERT(sc);
1376
1377 switch (sc->sc_state) {
1378 case INIT:
1379 printf("%s: master_down event in INIT state\n",
1380 SC2IFP(sc)->if_xname);
1381 break;
1382 case MASTER:
1383 break;
1384 case BACKUP:
1385 carp_set_state(sc, MASTER);
1386 carp_send_ad_locked(sc);
1387 #ifdef INET
1388 carp_send_arp(sc);
1389 #endif
1390 #ifdef INET6
1391 carp_send_na(sc);
1392 #endif /* INET6 */
1393 carp_setrun(sc, 0);
1394 carp_setroute(sc, RTM_ADD);
1395 break;
1396 }
1397 }
1398
1399 /*
1400 * When in backup state, af indicates whether to reset the master down timer
1401 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1402 */
1403 static void
1404 carp_setrun(struct carp_softc *sc, sa_family_t af)
1405 {
1406 struct timeval tv;
1407
1408 if (sc->sc_carpdev == NULL) {
1409 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1410 carp_set_state(sc, INIT);
1411 return;
1412 } else
1413 CARP_SCLOCK_ASSERT(sc);
1414
1415 if (SC2IFP(sc)->if_flags & IFF_UP &&
1416 sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6) &&
1417 sc->sc_carpdev->if_link_state == LINK_STATE_UP)
1418 SC2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING;
1419 else {
1420 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1421 carp_setroute(sc, RTM_DELETE);
1422 return;
1423 }
1424
1425 switch (sc->sc_state) {
1426 case INIT:
1427 CARP_LOG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname);
1428 carp_set_state(sc, BACKUP);
1429 carp_setroute(sc, RTM_DELETE);
1430 carp_setrun(sc, 0);
1431 break;
1432 case BACKUP:
1433 callout_stop(&sc->sc_ad_tmo);
1434 tv.tv_sec = 3 * sc->sc_advbase;
1435 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1436 switch (af) {
1437 #ifdef INET
1438 case AF_INET:
1439 callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
1440 carp_master_down, sc);
1441 break;
1442 #endif /* INET */
1443 #ifdef INET6
1444 case AF_INET6:
1445 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
1446 carp_master_down, sc);
1447 break;
1448 #endif /* INET6 */
1449 default:
1450 if (sc->sc_naddrs)
1451 callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
1452 carp_master_down, sc);
1453 if (sc->sc_naddrs6)
1454 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
1455 carp_master_down, sc);
1456 break;
1457 }
1458 break;
1459 case MASTER:
1460 tv.tv_sec = sc->sc_advbase;
1461 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1462 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1463 carp_send_ad, sc);
1464 break;
1465 }
1466 }
1467
1468 #ifdef INET
1469 static void
1470 carp_multicast_cleanup(struct carp_softc *sc, int dofree)
1471 {
1472 struct ip_moptions *imo = &sc->sc_imo;
1473 u_int16_t n = imo->imo_num_memberships;
1474
1475 /* Clean up our own multicast memberships */
1476 while (n-- > 0) {
1477 if (imo->imo_membership[n] != NULL) {
1478 if (dofree)
1479 in_delmulti(imo->imo_membership[n]);
1480 imo->imo_membership[n] = NULL;
1481 }
1482 }
1483 KASSERT(imo->imo_mfilters == NULL,
1484 ("%s: imo_mfilters != NULL", __func__));
1485 imo->imo_num_memberships = 0;
1486 imo->imo_multicast_ifp = NULL;
1487 }
1488 #endif
1489
1490 #ifdef INET6
1491 static void
1492 carp_multicast6_cleanup(struct carp_softc *sc, int dofree)
1493 {
1494 struct ip6_moptions *im6o = &sc->sc_im6o;
1495 u_int16_t n = im6o->im6o_num_memberships;
1496
1497 while (n-- > 0) {
1498 if (im6o->im6o_membership[n] != NULL) {
1499 if (dofree)
1500 in6_mc_leave(im6o->im6o_membership[n], NULL);
1501 im6o->im6o_membership[n] = NULL;
1502 }
1503 }
1504 KASSERT(im6o->im6o_mfilters == NULL,
1505 ("%s: im6o_mfilters != NULL", __func__));
1506 im6o->im6o_num_memberships = 0;
1507 im6o->im6o_multicast_ifp = NULL;
1508 }
1509 #endif
1510
1511 #ifdef INET
1512 static int
1513 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1514 {
1515 struct ifnet *ifp;
1516 struct carp_if *cif;
1517 struct in_ifaddr *ia, *ia_if;
1518 struct ip_moptions *imo = &sc->sc_imo;
1519 struct in_addr addr;
1520 u_long iaddr = htonl(sin->sin_addr.s_addr);
1521 int own, error;
1522
1523 if (sin->sin_addr.s_addr == 0) {
1524 if (!(SC2IFP(sc)->if_flags & IFF_UP))
1525 carp_set_state(sc, INIT);
1526 if (sc->sc_naddrs)
1527 SC2IFP(sc)->if_flags |= IFF_UP;
1528 if (sc->sc_carpdev)
1529 CARP_SCLOCK(sc);
1530 carp_setrun(sc, 0);
1531 if (sc->sc_carpdev)
1532 CARP_SCUNLOCK(sc);
1533 return (0);
1534 }
1535
1536 /* we have to do it by hands to check we won't match on us */
1537 ia_if = NULL; own = 0;
1538 IN_IFADDR_RLOCK();
1539 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1540 /* and, yeah, we need a multicast-capable iface too */
1541 if (ia->ia_ifp != SC2IFP(sc) &&
1542 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1543 (iaddr & ia->ia_subnetmask) == ia->ia_subnet) {
1544 if (!ia_if)
1545 ia_if = ia;
1546 if (sin->sin_addr.s_addr ==
1547 ia->ia_addr.sin_addr.s_addr)
1548 own++;
1549 }
1550 }
1551
1552 if (!ia_if) {
1553 IN_IFADDR_RUNLOCK();
1554 return (EADDRNOTAVAIL);
1555 }
1556
1557 ia = ia_if;
1558 ifa_ref(&ia->ia_ifa);
1559 IN_IFADDR_RUNLOCK();
1560
1561 ifp = ia->ia_ifp;
1562
1563 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1564 (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp)) {
1565 ifa_free(&ia->ia_ifa);
1566 return (EADDRNOTAVAIL);
1567 }
1568
1569 if (imo->imo_num_memberships == 0) {
1570 addr.s_addr = htonl(INADDR_CARP_GROUP);
1571 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) ==
1572 NULL) {
1573 ifa_free(&ia->ia_ifa);
1574 return (ENOBUFS);
1575 }
1576 imo->imo_num_memberships++;
1577 imo->imo_multicast_ifp = ifp;
1578 imo->imo_multicast_ttl = CARP_DFLTTL;
1579 imo->imo_multicast_loop = 0;
1580 }
1581
1582 if (!ifp->if_carp) {
1583
1584 cif = malloc(sizeof(*cif), M_CARP,
1585 M_WAITOK|M_ZERO);
1586 if (!cif) {
1587 error = ENOBUFS;
1588 goto cleanup;
1589 }
1590 if ((error = ifpromisc(ifp, 1))) {
1591 free(cif, M_CARP);
1592 goto cleanup;
1593 }
1594
1595 CARP_LOCK_INIT(cif);
1596 CARP_LOCK(cif);
1597 cif->vhif_ifp = ifp;
1598 TAILQ_INIT(&cif->vhif_vrs);
1599 ifp->if_carp = cif;
1600
1601 } else {
1602 struct carp_softc *vr;
1603
1604 cif = (struct carp_if *)ifp->if_carp;
1605 CARP_LOCK(cif);
1606 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1607 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1608 CARP_UNLOCK(cif);
1609 error = EEXIST;
1610 goto cleanup;
1611 }
1612 }
1613 sc->sc_ia = ia;
1614 sc->sc_carpdev = ifp;
1615
1616 { /* XXX prevent endless loop if already in queue */
1617 struct carp_softc *vr, *after = NULL;
1618 int myself = 0;
1619 cif = (struct carp_if *)ifp->if_carp;
1620
1621 /* XXX: cif should not change, right? So we still hold the lock */
1622 CARP_LOCK_ASSERT(cif);
1623
1624 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1625 if (vr == sc)
1626 myself = 1;
1627 if (vr->sc_vhid < sc->sc_vhid)
1628 after = vr;
1629 }
1630
1631 if (!myself) {
1632 /* We're trying to keep things in order */
1633 if (after == NULL) {
1634 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1635 } else {
1636 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1637 }
1638 cif->vhif_nvrs++;
1639 }
1640 }
1641
1642 sc->sc_naddrs++;
1643 SC2IFP(sc)->if_flags |= IFF_UP;
1644 if (own)
1645 sc->sc_advskew = 0;
1646 carp_sc_state_locked(sc);
1647 carp_setrun(sc, 0);
1648
1649 CARP_UNLOCK(cif);
1650 ifa_free(&ia->ia_ifa); /* XXXRW: should hold reference for softc. */
1651
1652 return (0);
1653
1654 cleanup:
1655 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1656 ifa_free(&ia->ia_ifa);
1657 return (error);
1658 }
1659
1660 static int
1661 carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1662 {
1663 int error = 0;
1664
1665 if (!--sc->sc_naddrs) {
1666 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1667 struct ip_moptions *imo = &sc->sc_imo;
1668
1669 CARP_LOCK(cif);
1670 callout_stop(&sc->sc_ad_tmo);
1671 SC2IFP(sc)->if_flags &= ~IFF_UP;
1672 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1673 sc->sc_vhid = -1;
1674 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1675 imo->imo_multicast_ifp = NULL;
1676 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1677 if (!--cif->vhif_nvrs) {
1678 sc->sc_carpdev->if_carp = NULL;
1679 CARP_LOCK_DESTROY(cif);
1680 free(cif, M_CARP);
1681 } else {
1682 CARP_UNLOCK(cif);
1683 }
1684 }
1685
1686 return (error);
1687 }
1688 #endif
1689
1690 #ifdef INET6
1691 static int
1692 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1693 {
1694 struct ifnet *ifp;
1695 struct carp_if *cif;
1696 struct in6_ifaddr *ia, *ia_if;
1697 struct ip6_moptions *im6o = &sc->sc_im6o;
1698 struct in6_addr in6;
1699 int own, error;
1700
1701 error = 0;
1702
1703 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1704 if (!(SC2IFP(sc)->if_flags & IFF_UP))
1705 carp_set_state(sc, INIT);
1706 if (sc->sc_naddrs6)
1707 SC2IFP(sc)->if_flags |= IFF_UP;
1708 if (sc->sc_carpdev)
1709 CARP_SCLOCK(sc);
1710 carp_setrun(sc, 0);
1711 if (sc->sc_carpdev)
1712 CARP_SCUNLOCK(sc);
1713 return (0);
1714 }
1715
1716 /* we have to do it by hands to check we won't match on us */
1717 ia_if = NULL; own = 0;
1718 IN6_IFADDR_RLOCK();
1719 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
1720 int i;
1721
1722 for (i = 0; i < 4; i++) {
1723 if ((sin6->sin6_addr.s6_addr32[i] &
1724 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
1725 (ia->ia_addr.sin6_addr.s6_addr32[i] &
1726 ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
1727 break;
1728 }
1729 /* and, yeah, we need a multicast-capable iface too */
1730 if (ia->ia_ifp != SC2IFP(sc) &&
1731 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1732 (i == 4)) {
1733 if (!ia_if)
1734 ia_if = ia;
1735 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
1736 &ia->ia_addr.sin6_addr))
1737 own++;
1738 }
1739 }
1740
1741 if (!ia_if) {
1742 IN6_IFADDR_RUNLOCK();
1743 return (EADDRNOTAVAIL);
1744 }
1745 ia = ia_if;
1746 ifa_ref(&ia->ia_ifa);
1747 IN6_IFADDR_RUNLOCK();
1748 ifp = ia->ia_ifp;
1749
1750 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1751 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp)) {
1752 ifa_free(&ia->ia_ifa);
1753 return (EADDRNOTAVAIL);
1754 }
1755
1756 if (!sc->sc_naddrs6) {
1757 struct in6_multi *in6m;
1758
1759 im6o->im6o_multicast_ifp = ifp;
1760
1761 /* join CARP multicast address */
1762 bzero(&in6, sizeof(in6));
1763 in6.s6_addr16[0] = htons(0xff02);
1764 in6.s6_addr8[15] = 0x12;
1765 if (in6_setscope(&in6, ifp, NULL) != 0)
1766 goto cleanup;
1767 in6m = NULL;
1768 error = in6_mc_join(ifp, &in6, NULL, &in6m, 0);
1769 if (error)
1770 goto cleanup;
1771 im6o->im6o_membership[0] = in6m;
1772 im6o->im6o_num_memberships++;
1773
1774 /* join solicited multicast address */
1775 bzero(&in6, sizeof(in6));
1776 in6.s6_addr16[0] = htons(0xff02);
1777 in6.s6_addr32[1] = 0;
1778 in6.s6_addr32[2] = htonl(1);
1779 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3];
1780 in6.s6_addr8[12] = 0xff;
1781 if (in6_setscope(&in6, ifp, NULL) != 0)
1782 goto cleanup;
1783 in6m = NULL;
1784 error = in6_mc_join(ifp, &in6, NULL, &in6m, 0);
1785 if (error)
1786 goto cleanup;
1787 im6o->im6o_membership[1] = in6m;
1788 im6o->im6o_num_memberships++;
1789 }
1790
1791 if (!ifp->if_carp) {
1792 cif = malloc(sizeof(*cif), M_CARP,
1793 M_WAITOK|M_ZERO);
1794 if (!cif) {
1795 error = ENOBUFS;
1796 goto cleanup;
1797 }
1798 if ((error = ifpromisc(ifp, 1))) {
1799 free(cif, M_CARP);
1800 goto cleanup;
1801 }
1802
1803 CARP_LOCK_INIT(cif);
1804 CARP_LOCK(cif);
1805 cif->vhif_ifp = ifp;
1806 TAILQ_INIT(&cif->vhif_vrs);
1807 ifp->if_carp = cif;
1808
1809 } else {
1810 struct carp_softc *vr;
1811
1812 cif = (struct carp_if *)ifp->if_carp;
1813 CARP_LOCK(cif);
1814 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1815 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1816 CARP_UNLOCK(cif);
1817 error = EINVAL;
1818 goto cleanup;
1819 }
1820 }
1821 sc->sc_ia6 = ia;
1822 sc->sc_carpdev = ifp;
1823
1824 { /* XXX prevent endless loop if already in queue */
1825 struct carp_softc *vr, *after = NULL;
1826 int myself = 0;
1827 cif = (struct carp_if *)ifp->if_carp;
1828 CARP_LOCK_ASSERT(cif);
1829
1830 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1831 if (vr == sc)
1832 myself = 1;
1833 if (vr->sc_vhid < sc->sc_vhid)
1834 after = vr;
1835 }
1836
1837 if (!myself) {
1838 /* We're trying to keep things in order */
1839 if (after == NULL) {
1840 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1841 } else {
1842 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1843 }
1844 cif->vhif_nvrs++;
1845 }
1846 }
1847
1848 sc->sc_naddrs6++;
1849 SC2IFP(sc)->if_flags |= IFF_UP;
1850 if (own)
1851 sc->sc_advskew = 0;
1852 carp_sc_state_locked(sc);
1853 carp_setrun(sc, 0);
1854
1855 CARP_UNLOCK(cif);
1856 ifa_free(&ia->ia_ifa); /* XXXRW: should hold reference for softc. */
1857
1858 return (0);
1859
1860 cleanup:
1861 if (!sc->sc_naddrs6)
1862 carp_multicast6_cleanup(sc, 1);
1863 ifa_free(&ia->ia_ifa);
1864 return (error);
1865 }
1866
1867 static int
1868 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1869 {
1870 int error = 0;
1871
1872 if (!--sc->sc_naddrs6) {
1873 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1874
1875 CARP_LOCK(cif);
1876 callout_stop(&sc->sc_ad_tmo);
1877 SC2IFP(sc)->if_flags &= ~IFF_UP;
1878 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1879 sc->sc_vhid = -1;
1880 carp_multicast6_cleanup(sc, 1);
1881 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1882 if (!--cif->vhif_nvrs) {
1883 CARP_LOCK_DESTROY(cif);
1884 sc->sc_carpdev->if_carp = NULL;
1885 free(cif, M_CARP);
1886 } else
1887 CARP_UNLOCK(cif);
1888 }
1889
1890 return (error);
1891 }
1892 #endif /* INET6 */
1893
1894 static int
1895 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr)
1896 {
1897 struct carp_softc *sc = ifp->if_softc, *vr;
1898 struct carpreq carpr;
1899 struct ifaddr *ifa;
1900 struct ifreq *ifr;
1901 struct ifaliasreq *ifra;
1902 int locked = 0, error = 0;
1903
1904 ifa = (struct ifaddr *)addr;
1905 ifra = (struct ifaliasreq *)addr;
1906 ifr = (struct ifreq *)addr;
1907
1908 switch (cmd) {
1909 case SIOCSIFADDR:
1910 switch (ifa->ifa_addr->sa_family) {
1911 #ifdef INET
1912 case AF_INET:
1913 SC2IFP(sc)->if_flags |= IFF_UP;
1914 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1915 sizeof(struct sockaddr));
1916 error = carp_set_addr(sc, satosin(ifa->ifa_addr));
1917 break;
1918 #endif /* INET */
1919 #ifdef INET6
1920 case AF_INET6:
1921 SC2IFP(sc)->if_flags |= IFF_UP;
1922 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr));
1923 break;
1924 #endif /* INET6 */
1925 default:
1926 error = EAFNOSUPPORT;
1927 break;
1928 }
1929 break;
1930
1931 case SIOCAIFADDR:
1932 switch (ifa->ifa_addr->sa_family) {
1933 #ifdef INET
1934 case AF_INET:
1935 SC2IFP(sc)->if_flags |= IFF_UP;
1936 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1937 sizeof(struct sockaddr));
1938 error = carp_set_addr(sc, satosin(&ifra->ifra_addr));
1939 break;
1940 #endif /* INET */
1941 #ifdef INET6
1942 case AF_INET6:
1943 SC2IFP(sc)->if_flags |= IFF_UP;
1944 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr));
1945 break;
1946 #endif /* INET6 */
1947 default:
1948 error = EAFNOSUPPORT;
1949 break;
1950 }
1951 break;
1952
1953 case SIOCDIFADDR:
1954 switch (ifa->ifa_addr->sa_family) {
1955 #ifdef INET
1956 case AF_INET:
1957 error = carp_del_addr(sc, satosin(&ifra->ifra_addr));
1958 break;
1959 #endif /* INET */
1960 #ifdef INET6
1961 case AF_INET6:
1962 error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr));
1963 break;
1964 #endif /* INET6 */
1965 default:
1966 error = EAFNOSUPPORT;
1967 break;
1968 }
1969 break;
1970
1971 case SIOCSIFFLAGS:
1972 if (sc->sc_carpdev) {
1973 locked = 1;
1974 CARP_SCLOCK(sc);
1975 }
1976 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) {
1977 callout_stop(&sc->sc_ad_tmo);
1978 callout_stop(&sc->sc_md_tmo);
1979 callout_stop(&sc->sc_md6_tmo);
1980 if (sc->sc_state == MASTER)
1981 carp_send_ad_locked(sc);
1982 carp_set_state(sc, INIT);
1983 carp_setrun(sc, 0);
1984 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) {
1985 SC2IFP(sc)->if_flags |= IFF_UP;
1986 carp_setrun(sc, 0);
1987 }
1988 break;
1989
1990 case SIOCSVH:
1991 error = priv_check(curthread, PRIV_NETINET_CARP);
1992 if (error)
1993 break;
1994 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr)))
1995 break;
1996 error = 1;
1997 if (sc->sc_carpdev) {
1998 locked = 1;
1999 CARP_SCLOCK(sc);
2000 }
2001 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) {
2002 switch (carpr.carpr_state) {
2003 case BACKUP:
2004 callout_stop(&sc->sc_ad_tmo);
2005 carp_set_state(sc, BACKUP);
2006 carp_setrun(sc, 0);
2007 carp_setroute(sc, RTM_DELETE);
2008 break;
2009 case MASTER:
2010 carp_master_down_locked(sc);
2011 break;
2012 default:
2013 break;
2014 }
2015 }
2016 if (carpr.carpr_vhid > 0) {
2017 if (carpr.carpr_vhid > 255) {
2018 error = EINVAL;
2019 break;
2020 }
2021 if (sc->sc_carpdev) {
2022 struct carp_if *cif;
2023 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
2024 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
2025 if (vr != sc &&
2026 vr->sc_vhid == carpr.carpr_vhid) {
2027 error = EEXIST;
2028 break;
2029 }
2030 if (error == EEXIST)
2031 break;
2032 }
2033 sc->sc_vhid = carpr.carpr_vhid;
2034 IF_LLADDR(sc->sc_ifp)[0] = 0;
2035 IF_LLADDR(sc->sc_ifp)[1] = 0;
2036 IF_LLADDR(sc->sc_ifp)[2] = 0x5e;
2037 IF_LLADDR(sc->sc_ifp)[3] = 0;
2038 IF_LLADDR(sc->sc_ifp)[4] = 1;
2039 IF_LLADDR(sc->sc_ifp)[5] = sc->sc_vhid;
2040 error--;
2041 }
2042 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) {
2043 if (carpr.carpr_advskew >= 255) {
2044 error = EINVAL;
2045 break;
2046 }
2047 if (carpr.carpr_advbase > 255) {
2048 error = EINVAL;
2049 break;
2050 }
2051 sc->sc_advbase = carpr.carpr_advbase;
2052 sc->sc_advskew = carpr.carpr_advskew;
2053 error--;
2054 }
2055 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key));
2056 if (error > 0)
2057 error = EINVAL;
2058 else {
2059 error = 0;
2060 carp_setrun(sc, 0);
2061 }
2062 break;
2063
2064 case SIOCGVH:
2065 /* XXX: lockless read */
2066 bzero(&carpr, sizeof(carpr));
2067 carpr.carpr_state = sc->sc_state;
2068 carpr.carpr_vhid = sc->sc_vhid;
2069 carpr.carpr_advbase = sc->sc_advbase;
2070 carpr.carpr_advskew = sc->sc_advskew;
2071 error = priv_check(curthread, PRIV_NETINET_CARP);
2072 if (error == 0)
2073 bcopy(sc->sc_key, carpr.carpr_key,
2074 sizeof(carpr.carpr_key));
2075 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
2076 break;
2077
2078 default:
2079 error = EINVAL;
2080 }
2081
2082 if (locked)
2083 CARP_SCUNLOCK(sc);
2084
2085 carp_hmac_prepare(sc);
2086
2087 return (error);
2088 }
2089
2090 /*
2091 * XXX: this is looutput. We should eventually use it from there.
2092 */
2093 static int
2094 carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
2095 struct route *ro)
2096 {
2097 u_int32_t af;
2098 struct rtentry *rt = NULL;
2099
2100 M_ASSERTPKTHDR(m); /* check if we have the packet header */
2101
2102 if (ro != NULL)
2103 rt = ro->ro_rt;
2104 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
2105 m_freem(m);
2106 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
2107 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
2108 }
2109
2110 ifp->if_opackets++;
2111 ifp->if_obytes += m->m_pkthdr.len;
2112
2113 /* BPF writes need to be handled specially. */
2114 if (dst->sa_family == AF_UNSPEC) {
2115 bcopy(dst->sa_data, &af, sizeof(af));
2116 dst->sa_family = af;
2117 }
2118
2119 #if 1 /* XXX */
2120 switch (dst->sa_family) {
2121 case AF_INET:
2122 case AF_INET6:
2123 case AF_IPX:
2124 case AF_APPLETALK:
2125 break;
2126 default:
2127 printf("carp_looutput: af=%d unexpected\n", dst->sa_family);
2128 m_freem(m);
2129 return (EAFNOSUPPORT);
2130 }
2131 #endif
2132 return(if_simloop(ifp, m, dst->sa_family, 0));
2133 }
2134
2135 /*
2136 * Start output on carp interface. This function should never be called.
2137 */
2138 static void
2139 carp_start(struct ifnet *ifp)
2140 {
2141 #ifdef DEBUG
2142 printf("%s: start called\n", ifp->if_xname);
2143 #endif
2144 }
2145
2146 int
2147 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
2148 struct rtentry *rt)
2149 {
2150 struct m_tag *mtag;
2151 struct carp_softc *sc;
2152 struct ifnet *carp_ifp;
2153
2154 if (!sa)
2155 return (0);
2156
2157 switch (sa->sa_family) {
2158 #ifdef INET
2159 case AF_INET:
2160 break;
2161 #endif /* INET */
2162 #ifdef INET6
2163 case AF_INET6:
2164 break;
2165 #endif /* INET6 */
2166 default:
2167 return (0);
2168 }
2169
2170 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL);
2171 if (mtag == NULL)
2172 return (0);
2173
2174 bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *));
2175 sc = carp_ifp->if_softc;
2176
2177 /* Set the source MAC address to Virtual Router MAC Address */
2178 switch (ifp->if_type) {
2179 case IFT_ETHER:
2180 case IFT_L2VLAN: {
2181 struct ether_header *eh;
2182
2183 eh = mtod(m, struct ether_header *);
2184 eh->ether_shost[0] = 0;
2185 eh->ether_shost[1] = 0;
2186 eh->ether_shost[2] = 0x5e;
2187 eh->ether_shost[3] = 0;
2188 eh->ether_shost[4] = 1;
2189 eh->ether_shost[5] = sc->sc_vhid;
2190 }
2191 break;
2192 case IFT_FDDI: {
2193 struct fddi_header *fh;
2194
2195 fh = mtod(m, struct fddi_header *);
2196 fh->fddi_shost[0] = 0;
2197 fh->fddi_shost[1] = 0;
2198 fh->fddi_shost[2] = 0x5e;
2199 fh->fddi_shost[3] = 0;
2200 fh->fddi_shost[4] = 1;
2201 fh->fddi_shost[5] = sc->sc_vhid;
2202 }
2203 break;
2204 case IFT_ISO88025: {
2205 struct iso88025_header *th;
2206 th = mtod(m, struct iso88025_header *);
2207 th->iso88025_shost[0] = 3;
2208 th->iso88025_shost[1] = 0;
2209 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1);
2210 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1);
2211 th->iso88025_shost[4] = 0;
2212 th->iso88025_shost[5] = 0;
2213 }
2214 break;
2215 default:
2216 printf("%s: carp is not supported for this interface type\n",
2217 ifp->if_xname);
2218 return (EOPNOTSUPP);
2219 }
2220
2221 return (0);
2222 }
2223
2224 static void
2225 carp_set_state(struct carp_softc *sc, int state)
2226 {
2227 int link_state;
2228
2229 if (sc->sc_carpdev)
2230 CARP_SCLOCK_ASSERT(sc);
2231
2232 if (sc->sc_state == state)
2233 return;
2234
2235 sc->sc_state = state;
2236 switch (state) {
2237 case BACKUP:
2238 link_state = LINK_STATE_DOWN;
2239 break;
2240 case MASTER:
2241 link_state = LINK_STATE_UP;
2242 break;
2243 default:
2244 link_state = LINK_STATE_UNKNOWN;
2245 break;
2246 }
2247 if_link_state_change(SC2IFP(sc), link_state);
2248 }
2249
2250 void
2251 carp_carpdev_state(struct ifnet *ifp)
2252 {
2253 struct carp_if *cif;
2254
2255 cif = ifp->if_carp;
2256 CARP_LOCK(cif);
2257 carp_carpdev_state_locked(cif);
2258 CARP_UNLOCK(cif);
2259 }
2260
2261 static void
2262 carp_carpdev_state_locked(struct carp_if *cif)
2263 {
2264 struct carp_softc *sc;
2265
2266 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
2267 carp_sc_state_locked(sc);
2268 }
2269
2270 static void
2271 carp_sc_state_locked(struct carp_softc *sc)
2272 {
2273 CARP_SCLOCK_ASSERT(sc);
2274
2275 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP ||
2276 !(sc->sc_carpdev->if_flags & IFF_UP)) {
2277 sc->sc_flags_backup = SC2IFP(sc)->if_flags;
2278 SC2IFP(sc)->if_flags &= ~IFF_UP;
2279 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
2280 callout_stop(&sc->sc_ad_tmo);
2281 callout_stop(&sc->sc_md_tmo);
2282 callout_stop(&sc->sc_md6_tmo);
2283 carp_set_state(sc, INIT);
2284 carp_setrun(sc, 0);
2285 if (!sc->sc_suppress) {
2286 carp_suppress_preempt++;
2287 if (carp_suppress_preempt == 1) {
2288 CARP_SCUNLOCK(sc);
2289 carp_send_ad_all();
2290 CARP_SCLOCK(sc);
2291 }
2292 }
2293 sc->sc_suppress = 1;
2294 } else {
2295 SC2IFP(sc)->if_flags |= sc->sc_flags_backup;
2296 carp_set_state(sc, INIT);
2297 carp_setrun(sc, 0);
2298 if (sc->sc_suppress)
2299 carp_suppress_preempt--;
2300 sc->sc_suppress = 0;
2301 }
2302
2303 return;
2304 }
2305
2306 #ifdef INET
2307 extern struct domain inetdomain;
2308 static struct protosw in_carp_protosw = {
2309 .pr_type = SOCK_RAW,
2310 .pr_domain = &inetdomain,
2311 .pr_protocol = IPPROTO_CARP,
2312 .pr_flags = PR_ATOMIC|PR_ADDR,
2313 .pr_input = carp_input,
2314 .pr_output = (pr_output_t *)rip_output,
2315 .pr_ctloutput = rip_ctloutput,
2316 .pr_usrreqs = &rip_usrreqs
2317 };
2318 #endif
2319
2320 #ifdef INET6
2321 extern struct domain inet6domain;
2322 static struct ip6protosw in6_carp_protosw = {
2323 .pr_type = SOCK_RAW,
2324 .pr_domain = &inet6domain,
2325 .pr_protocol = IPPROTO_CARP,
2326 .pr_flags = PR_ATOMIC|PR_ADDR,
2327 .pr_input = carp6_input,
2328 .pr_output = rip6_output,
2329 .pr_ctloutput = rip6_ctloutput,
2330 .pr_usrreqs = &rip6_usrreqs
2331 };
2332 #endif
2333
2334 static void
2335 carp_mod_cleanup(void)
2336 {
2337
2338 if (if_detach_event_tag == NULL)
2339 return;
2340 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag);
2341 if_clone_detach(&carp_cloner);
2342 #ifdef INET
2343 if (proto_reg[CARP_INET] == 0) {
2344 (void)ipproto_unregister(IPPROTO_CARP);
2345 pf_proto_unregister(PF_INET, IPPROTO_CARP, SOCK_RAW);
2346 proto_reg[CARP_INET] = -1;
2347 }
2348 carp_iamatch_p = NULL;
2349 #endif
2350 #ifdef INET6
2351 if (proto_reg[CARP_INET6] == 0) {
2352 (void)ip6proto_unregister(IPPROTO_CARP);
2353 pf_proto_unregister(PF_INET6, IPPROTO_CARP, SOCK_RAW);
2354 proto_reg[CARP_INET6] = -1;
2355 }
2356 carp_iamatch6_p = NULL;
2357 carp_macmatch6_p = NULL;
2358 #endif
2359 carp_linkstate_p = NULL;
2360 carp_forus_p = NULL;
2361 carp_output_p = NULL;
2362 mtx_destroy(&carp_mtx);
2363 }
2364
2365 static int
2366 carp_mod_load(void)
2367 {
2368 int err;
2369
2370 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
2371 carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY);
2372 if (if_detach_event_tag == NULL)
2373 return (ENOMEM);
2374 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF);
2375 LIST_INIT(&carpif_list);
2376 if_clone_attach(&carp_cloner);
2377 carp_linkstate_p = carp_carpdev_state;
2378 carp_forus_p = carp_forus;
2379 carp_output_p = carp_output;
2380 #ifdef INET6
2381 carp_iamatch6_p = carp_iamatch6;
2382 carp_macmatch6_p = carp_macmatch6;
2383 proto_reg[CARP_INET6] = pf_proto_register(PF_INET6,
2384 (struct protosw *)&in6_carp_protosw);
2385 if (proto_reg[CARP_INET6] != 0) {
2386 printf("carp: error %d attaching to PF_INET6\n",
2387 proto_reg[CARP_INET6]);
2388 carp_mod_cleanup();
2389 return (proto_reg[CARP_INET6]);
2390 }
2391 err = ip6proto_register(IPPROTO_CARP);
2392 if (err) {
2393 printf("carp: error %d registering with INET6\n", err);
2394 carp_mod_cleanup();
2395 return (err);
2396 }
2397 #endif
2398 #ifdef INET
2399 carp_iamatch_p = carp_iamatch;
2400 proto_reg[CARP_INET] = pf_proto_register(PF_INET, &in_carp_protosw);
2401 if (proto_reg[CARP_INET] != 0) {
2402 printf("carp: error %d attaching to PF_INET\n",
2403 proto_reg[CARP_INET]);
2404 carp_mod_cleanup();
2405 return (proto_reg[CARP_INET]);
2406 }
2407 err = ipproto_register(IPPROTO_CARP);
2408 if (err) {
2409 printf("carp: error %d registering with INET\n", err);
2410 carp_mod_cleanup();
2411 return (err);
2412 }
2413 #endif
2414 return 0;
2415 }
2416
2417 static int
2418 carp_modevent(module_t mod, int type, void *data)
2419 {
2420 switch (type) {
2421 case MOD_LOAD:
2422 return carp_mod_load();
2423 /* NOTREACHED */
2424 case MOD_UNLOAD:
2425 /*
2426 * XXX: For now, disallow module unloading by default due to
2427 * a race condition where a thread may dereference one of the
2428 * function pointer hooks after the module has been
2429 * unloaded, during processing of a packet, causing a panic.
2430 */
2431 #ifdef CARPMOD_CAN_UNLOAD
2432 carp_mod_cleanup();
2433 #else
2434 return (EBUSY);
2435 #endif
2436 break;
2437
2438 default:
2439 return (EINVAL);
2440 }
2441
2442 return (0);
2443 }
2444
2445 static moduledata_t carp_mod = {
2446 "carp",
2447 carp_modevent,
2448 0
2449 };
2450
2451 DECLARE_MODULE(carp, carp_mod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
Cache object: 10ac7135f9de52f3966681cfd17eed64
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