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/8.2/sys/netinet/ip_carp.c 213505 2010-10-07 00:36:58Z delphij $");
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 #ifdef INET
70 #include <netinet/in.h>
71 #include <netinet/in_var.h>
72 #include <netinet/in_systm.h>
73 #include <netinet/ip.h>
74 #include <netinet/ip_var.h>
75 #include <netinet/if_ether.h>
76 #include <machine/in_cksum.h>
77 #endif
78
79 #ifdef INET6
80 #include <netinet/icmp6.h>
81 #include <netinet/ip6.h>
82 #include <netinet6/ip6protosw.h>
83 #include <netinet6/ip6_var.h>
84 #include <netinet6/scope6_var.h>
85 #include <netinet6/nd6.h>
86 #endif
87
88 #include <crypto/sha1.h>
89 #include <netinet/ip_carp.h>
90
91 #define CARP_IFNAME "carp"
92 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces");
93 SYSCTL_DECL(_net_inet_carp);
94
95 struct carp_softc {
96 struct ifnet *sc_ifp; /* Interface clue */
97 struct ifnet *sc_carpdev; /* Pointer to parent interface */
98 struct in_ifaddr *sc_ia; /* primary iface address */
99 struct ip_moptions sc_imo;
100 #ifdef INET6
101 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */
102 struct ip6_moptions sc_im6o;
103 #endif /* INET6 */
104 TAILQ_ENTRY(carp_softc) sc_list;
105
106 enum { INIT = 0, BACKUP, MASTER } sc_state;
107
108 int sc_flags_backup;
109 int sc_suppress;
110
111 int sc_sendad_errors;
112 #define CARP_SENDAD_MAX_ERRORS 3
113 int sc_sendad_success;
114 #define CARP_SENDAD_MIN_SUCCESS 3
115
116 int sc_vhid;
117 int sc_advskew;
118 int sc_naddrs;
119 int sc_naddrs6;
120 int sc_advbase; /* seconds */
121 int sc_init_counter;
122 u_int64_t sc_counter;
123
124 /* authentication */
125 #define CARP_HMAC_PAD 64
126 unsigned char sc_key[CARP_KEY_LEN];
127 unsigned char sc_pad[CARP_HMAC_PAD];
128 SHA1_CTX sc_sha1;
129
130 struct callout sc_ad_tmo; /* advertisement timeout */
131 struct callout sc_md_tmo; /* master down timeout */
132 struct callout sc_md6_tmo; /* master down timeout */
133
134 LIST_ENTRY(carp_softc) sc_next; /* Interface clue */
135 };
136 #define SC2IFP(sc) ((sc)->sc_ifp)
137
138 int carp_suppress_preempt = 0;
139 int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */
140 SYSCTL_NODE(_net_inet, IPPROTO_CARP, carp, CTLFLAG_RW, 0, "CARP");
141 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW,
142 &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets");
143 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW,
144 &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode");
145 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW,
146 &carp_opts[CARPCTL_LOG], 0, "log bad carp packets");
147 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW,
148 &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses");
149 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD,
150 &carp_suppress_preempt, 0, "Preemption is suppressed");
151
152 struct carpstats carpstats;
153 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW,
154 &carpstats, carpstats,
155 "CARP statistics (struct carpstats, netinet/ip_carp.h)");
156
157 struct carp_if {
158 TAILQ_HEAD(, carp_softc) vhif_vrs;
159 int vhif_nvrs;
160
161 struct ifnet *vhif_ifp;
162 struct mtx vhif_mtx;
163 };
164
165 #define CARP_INET 0
166 #define CARP_INET6 1
167 static int proto_reg[] = {-1, -1};
168
169 /* Get carp_if from softc. Valid after carp_set_addr{,6}. */
170 #define SC2CIF(sc) ((struct carp_if *)(sc)->sc_carpdev->if_carp)
171
172 /* lock per carp_if queue */
173 #define CARP_LOCK_INIT(cif) mtx_init(&(cif)->vhif_mtx, "carp_if", \
174 NULL, MTX_DEF)
175 #define CARP_LOCK_DESTROY(cif) mtx_destroy(&(cif)->vhif_mtx)
176 #define CARP_LOCK_ASSERT(cif) mtx_assert(&(cif)->vhif_mtx, MA_OWNED)
177 #define CARP_LOCK(cif) mtx_lock(&(cif)->vhif_mtx)
178 #define CARP_UNLOCK(cif) mtx_unlock(&(cif)->vhif_mtx)
179
180 #define CARP_SCLOCK(sc) mtx_lock(&SC2CIF(sc)->vhif_mtx)
181 #define CARP_SCUNLOCK(sc) mtx_unlock(&SC2CIF(sc)->vhif_mtx)
182 #define CARP_SCLOCK_ASSERT(sc) mtx_assert(&SC2CIF(sc)->vhif_mtx, MA_OWNED)
183
184 #define CARP_LOG(...) do { \
185 if (carp_opts[CARPCTL_LOG] > 0) \
186 log(LOG_INFO, __VA_ARGS__); \
187 } while (0)
188
189 #define CARP_DEBUG(...) do { \
190 if (carp_opts[CARPCTL_LOG] > 1) \
191 log(LOG_DEBUG, __VA_ARGS__); \
192 } while (0)
193
194 static void carp_hmac_prepare(struct carp_softc *);
195 static void carp_hmac_generate(struct carp_softc *, u_int32_t *,
196 unsigned char *);
197 static int carp_hmac_verify(struct carp_softc *, u_int32_t *,
198 unsigned char *);
199 static void carp_setroute(struct carp_softc *, int);
200 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t);
201 static int carp_clone_create(struct if_clone *, int, caddr_t);
202 static void carp_clone_destroy(struct ifnet *);
203 static void carpdetach(struct carp_softc *, int);
204 static int carp_prepare_ad(struct mbuf *, struct carp_softc *,
205 struct carp_header *);
206 static void carp_send_ad_all(void);
207 static void carp_send_ad(void *);
208 static void carp_send_ad_locked(struct carp_softc *);
209 static void carp_send_arp(struct carp_softc *);
210 static void carp_master_down(void *);
211 static void carp_master_down_locked(struct carp_softc *);
212 static int carp_ioctl(struct ifnet *, u_long, caddr_t);
213 static int carp_looutput(struct ifnet *, struct mbuf *, struct sockaddr *,
214 struct route *);
215 static void carp_start(struct ifnet *);
216 static void carp_setrun(struct carp_softc *, sa_family_t);
217 static void carp_set_state(struct carp_softc *, int);
218 static int carp_addrcount(struct carp_if *, struct in_ifaddr *, int);
219 enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING };
220
221 static void carp_multicast_cleanup(struct carp_softc *);
222 static int carp_set_addr(struct carp_softc *, struct sockaddr_in *);
223 static int carp_del_addr(struct carp_softc *, struct sockaddr_in *);
224 static void carp_carpdev_state_locked(struct carp_if *);
225 static void carp_sc_state_locked(struct carp_softc *);
226 #ifdef INET6
227 static void carp_send_na(struct carp_softc *);
228 static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *);
229 static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *);
230 static void carp_multicast6_cleanup(struct carp_softc *);
231 #endif
232
233 static LIST_HEAD(, carp_softc) carpif_list;
234 static struct mtx carp_mtx;
235 IFC_SIMPLE_DECLARE(carp, 0);
236
237 static eventhandler_tag if_detach_event_tag;
238
239 static __inline u_int16_t
240 carp_cksum(struct mbuf *m, int len)
241 {
242 return (in_cksum(m, len));
243 }
244
245 static void
246 carp_hmac_prepare(struct carp_softc *sc)
247 {
248 u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
249 u_int8_t vhid = sc->sc_vhid & 0xff;
250 struct ifaddr *ifa;
251 int i, found;
252 #ifdef INET
253 struct in_addr last, cur, in;
254 #endif
255 #ifdef INET6
256 struct in6_addr last6, cur6, in6;
257 #endif
258
259 if (sc->sc_carpdev)
260 CARP_SCLOCK(sc);
261
262 /* XXX: possible race here */
263
264 /* compute ipad from key */
265 bzero(sc->sc_pad, sizeof(sc->sc_pad));
266 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
267 for (i = 0; i < sizeof(sc->sc_pad); i++)
268 sc->sc_pad[i] ^= 0x36;
269
270 /* precompute first part of inner hash */
271 SHA1Init(&sc->sc_sha1);
272 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
273 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
274 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
275 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
276 #ifdef INET
277 cur.s_addr = 0;
278 do {
279 found = 0;
280 last = cur;
281 cur.s_addr = 0xffffffff;
282 IF_ADDR_LOCK(SC2IFP(sc));
283 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
284 in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr;
285 if (ifa->ifa_addr->sa_family == AF_INET &&
286 ntohl(in.s_addr) > ntohl(last.s_addr) &&
287 ntohl(in.s_addr) < ntohl(cur.s_addr)) {
288 cur.s_addr = in.s_addr;
289 found++;
290 }
291 }
292 IF_ADDR_UNLOCK(SC2IFP(sc));
293 if (found)
294 SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur));
295 } while (found);
296 #endif /* INET */
297 #ifdef INET6
298 memset(&cur6, 0, sizeof(cur6));
299 do {
300 found = 0;
301 last6 = cur6;
302 memset(&cur6, 0xff, sizeof(cur6));
303 IF_ADDR_LOCK(SC2IFP(sc));
304 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
305 in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
306 if (IN6_IS_SCOPE_EMBED(&in6))
307 in6.s6_addr16[1] = 0;
308 if (ifa->ifa_addr->sa_family == AF_INET6 &&
309 memcmp(&in6, &last6, sizeof(in6)) > 0 &&
310 memcmp(&in6, &cur6, sizeof(in6)) < 0) {
311 cur6 = in6;
312 found++;
313 }
314 }
315 IF_ADDR_UNLOCK(SC2IFP(sc));
316 if (found)
317 SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6));
318 } while (found);
319 #endif /* INET6 */
320
321 /* convert ipad to opad */
322 for (i = 0; i < sizeof(sc->sc_pad); i++)
323 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
324
325 if (sc->sc_carpdev)
326 CARP_SCUNLOCK(sc);
327 }
328
329 static void
330 carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2],
331 unsigned char md[20])
332 {
333 SHA1_CTX sha1ctx;
334
335 /* fetch first half of inner hash */
336 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
337
338 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
339 SHA1Final(md, &sha1ctx);
340
341 /* outer hash */
342 SHA1Init(&sha1ctx);
343 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
344 SHA1Update(&sha1ctx, md, 20);
345 SHA1Final(md, &sha1ctx);
346 }
347
348 static int
349 carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2],
350 unsigned char md[20])
351 {
352 unsigned char md2[20];
353
354 CARP_SCLOCK_ASSERT(sc);
355
356 carp_hmac_generate(sc, counter, md2);
357
358 return (bcmp(md, md2, sizeof(md2)));
359 }
360
361 static void
362 carp_setroute(struct carp_softc *sc, int cmd)
363 {
364 struct ifaddr *ifa;
365 int s;
366
367 if (sc->sc_carpdev)
368 CARP_SCLOCK_ASSERT(sc);
369
370 s = splnet();
371 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
372 if (ifa->ifa_addr->sa_family == AF_INET &&
373 sc->sc_carpdev != NULL) {
374 int count = carp_addrcount(
375 (struct carp_if *)sc->sc_carpdev->if_carp,
376 ifatoia(ifa), CARP_COUNT_MASTER);
377
378 if ((cmd == RTM_ADD && count == 1) ||
379 (cmd == RTM_DELETE && count == 0))
380 rtinit(ifa, cmd, RTF_UP | RTF_HOST);
381 }
382 }
383 splx(s);
384 }
385
386 static int
387 carp_clone_create(struct if_clone *ifc, int unit, caddr_t params)
388 {
389
390 struct carp_softc *sc;
391 struct ifnet *ifp;
392
393 sc = malloc(sizeof(*sc), M_CARP, M_WAITOK|M_ZERO);
394 ifp = SC2IFP(sc) = if_alloc(IFT_ETHER);
395 if (ifp == NULL) {
396 free(sc, M_CARP);
397 return (ENOSPC);
398 }
399
400 sc->sc_flags_backup = 0;
401 sc->sc_suppress = 0;
402 sc->sc_advbase = CARP_DFLTINTV;
403 sc->sc_vhid = -1; /* required setting */
404 sc->sc_advskew = 0;
405 sc->sc_init_counter = 1;
406 sc->sc_naddrs = sc->sc_naddrs6 = 0; /* M_ZERO? */
407 sc->sc_imo.imo_membership = (struct in_multi **)malloc(
408 (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP,
409 M_WAITOK);
410 sc->sc_imo.imo_mfilters = NULL;
411 sc->sc_imo.imo_max_memberships = IP_MIN_MEMBERSHIPS;
412 sc->sc_imo.imo_multicast_vif = -1;
413 #ifdef INET6
414 sc->sc_im6o.im6o_membership = (struct in6_multi **)malloc(
415 (sizeof(struct in6_multi *) * IPV6_MIN_MEMBERSHIPS), M_CARP,
416 M_WAITOK);
417 sc->sc_im6o.im6o_mfilters = NULL;
418 sc->sc_im6o.im6o_max_memberships = IPV6_MIN_MEMBERSHIPS;
419 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
420 #endif
421
422 callout_init(&sc->sc_ad_tmo, CALLOUT_MPSAFE);
423 callout_init(&sc->sc_md_tmo, CALLOUT_MPSAFE);
424 callout_init(&sc->sc_md6_tmo, CALLOUT_MPSAFE);
425
426 ifp->if_softc = sc;
427 if_initname(ifp, CARP_IFNAME, unit);
428 ifp->if_mtu = ETHERMTU;
429 ifp->if_flags = IFF_LOOPBACK;
430 ifp->if_ioctl = carp_ioctl;
431 ifp->if_output = carp_looutput;
432 ifp->if_start = carp_start;
433 ifp->if_type = IFT_CARP;
434 ifp->if_snd.ifq_maxlen = ifqmaxlen;
435 ifp->if_hdrlen = 0;
436 if_attach(ifp);
437 bpfattach(SC2IFP(sc), DLT_NULL, sizeof(u_int32_t));
438 mtx_lock(&carp_mtx);
439 LIST_INSERT_HEAD(&carpif_list, sc, sc_next);
440 mtx_unlock(&carp_mtx);
441 return (0);
442 }
443
444 static void
445 carp_clone_destroy(struct ifnet *ifp)
446 {
447 struct carp_softc *sc = ifp->if_softc;
448
449 if (sc->sc_carpdev)
450 CARP_SCLOCK(sc);
451 carpdetach(sc, 1); /* Returns unlocked. */
452
453 mtx_lock(&carp_mtx);
454 LIST_REMOVE(sc, sc_next);
455 mtx_unlock(&carp_mtx);
456 bpfdetach(ifp);
457 if_detach(ifp);
458 if_free_type(ifp, IFT_ETHER);
459 free(sc->sc_imo.imo_membership, M_CARP);
460 #ifdef INET6
461 free(sc->sc_im6o.im6o_membership, M_CARP);
462 #endif
463 free(sc, M_CARP);
464 }
465
466 /*
467 * This function can be called on CARP interface destroy path,
468 * and in case of the removal of the underlying interface as
469 * well. We differentiate these two cases. In the latter case
470 * we do not cleanup our multicast memberships, since they
471 * are already freed. Also, in the latter case we do not
472 * release the lock on return, because the function will be
473 * called once more, for another CARP instance on the same
474 * interface.
475 */
476 static void
477 carpdetach(struct carp_softc *sc, int unlock)
478 {
479 struct carp_if *cif;
480
481 callout_stop(&sc->sc_ad_tmo);
482 callout_stop(&sc->sc_md_tmo);
483 callout_stop(&sc->sc_md6_tmo);
484
485 if (sc->sc_suppress)
486 carp_suppress_preempt--;
487 sc->sc_suppress = 0;
488
489 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
490 carp_suppress_preempt--;
491 sc->sc_sendad_errors = 0;
492
493 carp_set_state(sc, INIT);
494 SC2IFP(sc)->if_flags &= ~IFF_UP;
495 carp_setrun(sc, 0);
496 if (unlock)
497 carp_multicast_cleanup(sc);
498 #ifdef INET6
499 carp_multicast6_cleanup(sc);
500 #endif
501
502 if (sc->sc_carpdev != NULL) {
503 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
504 CARP_LOCK_ASSERT(cif);
505 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
506 if (!--cif->vhif_nvrs) {
507 ifpromisc(sc->sc_carpdev, 0);
508 sc->sc_carpdev->if_carp = NULL;
509 CARP_LOCK_DESTROY(cif);
510 free(cif, M_CARP);
511 } else if (unlock)
512 CARP_UNLOCK(cif);
513 sc->sc_carpdev = NULL;
514 }
515 }
516
517 /* Detach an interface from the carp. */
518 static void
519 carp_ifdetach(void *arg __unused, struct ifnet *ifp)
520 {
521 struct carp_if *cif = (struct carp_if *)ifp->if_carp;
522 struct carp_softc *sc, *nextsc;
523
524 if (cif == NULL)
525 return;
526
527 /*
528 * XXX: At the end of for() cycle the lock will be destroyed.
529 */
530 CARP_LOCK(cif);
531 for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) {
532 nextsc = TAILQ_NEXT(sc, sc_list);
533 carpdetach(sc, 0);
534 }
535 }
536
537 /*
538 * process input packet.
539 * we have rearranged checks order compared to the rfc,
540 * but it seems more efficient this way or not possible otherwise.
541 */
542 void
543 carp_input(struct mbuf *m, int hlen)
544 {
545 struct ip *ip = mtod(m, struct ip *);
546 struct carp_header *ch;
547 int iplen, len;
548
549 CARPSTATS_INC(carps_ipackets);
550
551 if (!carp_opts[CARPCTL_ALLOW]) {
552 m_freem(m);
553 return;
554 }
555
556 /* check if received on a valid carp interface */
557 if (m->m_pkthdr.rcvif->if_carp == NULL) {
558 CARPSTATS_INC(carps_badif);
559 CARP_DEBUG("carp_input: packet received on non-carp "
560 "interface: %s\n",
561 m->m_pkthdr.rcvif->if_xname);
562 m_freem(m);
563 return;
564 }
565
566 /* verify that the IP TTL is 255. */
567 if (ip->ip_ttl != CARP_DFLTTL) {
568 CARPSTATS_INC(carps_badttl);
569 CARP_DEBUG("carp_input: received ttl %d != 255 on %s\n",
570 ip->ip_ttl,
571 m->m_pkthdr.rcvif->if_xname);
572 m_freem(m);
573 return;
574 }
575
576 iplen = ip->ip_hl << 2;
577
578 if (m->m_pkthdr.len < iplen + sizeof(*ch)) {
579 CARPSTATS_INC(carps_badlen);
580 CARP_DEBUG("carp_input: received len %zd < "
581 "sizeof(struct carp_header) on %s\n",
582 m->m_len - sizeof(struct ip),
583 m->m_pkthdr.rcvif->if_xname);
584 m_freem(m);
585 return;
586 }
587
588 if (iplen + sizeof(*ch) < m->m_len) {
589 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) {
590 CARPSTATS_INC(carps_hdrops);
591 CARP_DEBUG("carp_input: pullup failed\n");
592 return;
593 }
594 ip = mtod(m, struct ip *);
595 }
596 ch = (struct carp_header *)((char *)ip + iplen);
597
598 /*
599 * verify that the received packet length is
600 * equal to the CARP header
601 */
602 len = iplen + sizeof(*ch);
603 if (len > m->m_pkthdr.len) {
604 CARPSTATS_INC(carps_badlen);
605 CARP_DEBUG("carp_input: packet too short %d on %s\n",
606 m->m_pkthdr.len,
607 m->m_pkthdr.rcvif->if_xname);
608 m_freem(m);
609 return;
610 }
611
612 if ((m = m_pullup(m, len)) == NULL) {
613 CARPSTATS_INC(carps_hdrops);
614 return;
615 }
616 ip = mtod(m, struct ip *);
617 ch = (struct carp_header *)((char *)ip + iplen);
618
619 /* verify the CARP checksum */
620 m->m_data += iplen;
621 if (carp_cksum(m, len - iplen)) {
622 CARPSTATS_INC(carps_badsum);
623 CARP_DEBUG("carp_input: checksum failed on %s\n",
624 m->m_pkthdr.rcvif->if_xname);
625 m_freem(m);
626 return;
627 }
628 m->m_data -= iplen;
629
630 carp_input_c(m, ch, AF_INET);
631 }
632
633 #ifdef INET6
634 int
635 carp6_input(struct mbuf **mp, int *offp, int proto)
636 {
637 struct mbuf *m = *mp;
638 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
639 struct carp_header *ch;
640 u_int len;
641
642 CARPSTATS_INC(carps_ipackets6);
643
644 if (!carp_opts[CARPCTL_ALLOW]) {
645 m_freem(m);
646 return (IPPROTO_DONE);
647 }
648
649 /* check if received on a valid carp interface */
650 if (m->m_pkthdr.rcvif->if_carp == NULL) {
651 CARPSTATS_INC(carps_badif);
652 CARP_DEBUG("carp6_input: packet received on non-carp "
653 "interface: %s\n",
654 m->m_pkthdr.rcvif->if_xname);
655 m_freem(m);
656 return (IPPROTO_DONE);
657 }
658
659 /* verify that the IP TTL is 255 */
660 if (ip6->ip6_hlim != CARP_DFLTTL) {
661 CARPSTATS_INC(carps_badttl);
662 CARP_DEBUG("carp6_input: received ttl %d != 255 on %s\n",
663 ip6->ip6_hlim,
664 m->m_pkthdr.rcvif->if_xname);
665 m_freem(m);
666 return (IPPROTO_DONE);
667 }
668
669 /* verify that we have a complete carp packet */
670 len = m->m_len;
671 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
672 if (ch == NULL) {
673 CARPSTATS_INC(carps_badlen);
674 CARP_DEBUG("carp6_input: packet size %u too small\n", len);
675 return (IPPROTO_DONE);
676 }
677
678
679 /* verify the CARP checksum */
680 m->m_data += *offp;
681 if (carp_cksum(m, sizeof(*ch))) {
682 CARPSTATS_INC(carps_badsum);
683 CARP_DEBUG("carp6_input: checksum failed, on %s\n",
684 m->m_pkthdr.rcvif->if_xname);
685 m_freem(m);
686 return (IPPROTO_DONE);
687 }
688 m->m_data -= *offp;
689
690 carp_input_c(m, ch, AF_INET6);
691 return (IPPROTO_DONE);
692 }
693 #endif /* INET6 */
694
695 static void
696 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af)
697 {
698 struct ifnet *ifp = m->m_pkthdr.rcvif;
699 struct carp_softc *sc;
700 u_int64_t tmp_counter;
701 struct timeval sc_tv, ch_tv;
702
703 /* verify that the VHID is valid on the receiving interface */
704 CARP_LOCK(ifp->if_carp);
705 TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list)
706 if (sc->sc_vhid == ch->carp_vhid)
707 break;
708
709 if (!sc || !((SC2IFP(sc)->if_flags & IFF_UP) &&
710 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) {
711 CARPSTATS_INC(carps_badvhid);
712 CARP_UNLOCK(ifp->if_carp);
713 m_freem(m);
714 return;
715 }
716
717 getmicrotime(&SC2IFP(sc)->if_lastchange);
718 SC2IFP(sc)->if_ipackets++;
719 SC2IFP(sc)->if_ibytes += m->m_pkthdr.len;
720
721 if (bpf_peers_present(SC2IFP(sc)->if_bpf)) {
722 struct ip *ip = mtod(m, struct ip *);
723 uint32_t af1 = af;
724
725 /* BPF wants net byte order */
726 ip->ip_len = htons(ip->ip_len + (ip->ip_hl << 2));
727 ip->ip_off = htons(ip->ip_off);
728 bpf_mtap2(SC2IFP(sc)->if_bpf, &af1, sizeof(af1), m);
729 }
730
731 /* verify the CARP version. */
732 if (ch->carp_version != CARP_VERSION) {
733 CARPSTATS_INC(carps_badver);
734 SC2IFP(sc)->if_ierrors++;
735 CARP_UNLOCK(ifp->if_carp);
736 CARP_DEBUG("%s; invalid version %d\n",
737 SC2IFP(sc)->if_xname,
738 ch->carp_version);
739 m_freem(m);
740 return;
741 }
742
743 /* verify the hash */
744 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
745 CARPSTATS_INC(carps_badauth);
746 SC2IFP(sc)->if_ierrors++;
747 CARP_UNLOCK(ifp->if_carp);
748 CARP_DEBUG("%s: incorrect hash\n", SC2IFP(sc)->if_xname);
749 m_freem(m);
750 return;
751 }
752
753 tmp_counter = ntohl(ch->carp_counter[0]);
754 tmp_counter = tmp_counter<<32;
755 tmp_counter += ntohl(ch->carp_counter[1]);
756
757 /* XXX Replay protection goes here */
758
759 sc->sc_init_counter = 0;
760 sc->sc_counter = tmp_counter;
761
762 sc_tv.tv_sec = sc->sc_advbase;
763 if (carp_suppress_preempt && sc->sc_advskew < 240)
764 sc_tv.tv_usec = 240 * 1000000 / 256;
765 else
766 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256;
767 ch_tv.tv_sec = ch->carp_advbase;
768 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
769
770 switch (sc->sc_state) {
771 case INIT:
772 break;
773 case MASTER:
774 /*
775 * If we receive an advertisement from a master who's going to
776 * be more frequent than us, go into BACKUP state.
777 */
778 if (timevalcmp(&sc_tv, &ch_tv, >) ||
779 timevalcmp(&sc_tv, &ch_tv, ==)) {
780 callout_stop(&sc->sc_ad_tmo);
781 CARP_LOG("%s: MASTER -> BACKUP "
782 "(more frequent advertisement received)\n",
783 SC2IFP(sc)->if_xname);
784 carp_set_state(sc, BACKUP);
785 carp_setrun(sc, 0);
786 carp_setroute(sc, RTM_DELETE);
787 }
788 break;
789 case BACKUP:
790 /*
791 * If we're pre-empting masters who advertise slower than us,
792 * and this one claims to be slower, treat him as down.
793 */
794 if (carp_opts[CARPCTL_PREEMPT] &&
795 timevalcmp(&sc_tv, &ch_tv, <)) {
796 CARP_LOG("%s: BACKUP -> MASTER "
797 "(preempting a slower master)\n",
798 SC2IFP(sc)->if_xname);
799 carp_master_down_locked(sc);
800 break;
801 }
802
803 /*
804 * If the master is going to advertise at such a low frequency
805 * that he's guaranteed to time out, we'd might as well just
806 * treat him as timed out now.
807 */
808 sc_tv.tv_sec = sc->sc_advbase * 3;
809 if (timevalcmp(&sc_tv, &ch_tv, <)) {
810 CARP_LOG("%s: BACKUP -> MASTER "
811 "(master timed out)\n",
812 SC2IFP(sc)->if_xname);
813 carp_master_down_locked(sc);
814 break;
815 }
816
817 /*
818 * Otherwise, we reset the counter and wait for the next
819 * advertisement.
820 */
821 carp_setrun(sc, af);
822 break;
823 }
824
825 CARP_UNLOCK(ifp->if_carp);
826
827 m_freem(m);
828 return;
829 }
830
831 static int
832 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch)
833 {
834 struct m_tag *mtag;
835 struct ifnet *ifp = SC2IFP(sc);
836
837 if (sc->sc_init_counter) {
838 /* this could also be seconds since unix epoch */
839 sc->sc_counter = arc4random();
840 sc->sc_counter = sc->sc_counter << 32;
841 sc->sc_counter += arc4random();
842 } else
843 sc->sc_counter++;
844
845 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff);
846 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff);
847
848 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
849
850 /* Tag packet for carp_output */
851 mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct ifnet *), M_NOWAIT);
852 if (mtag == NULL) {
853 m_freem(m);
854 SC2IFP(sc)->if_oerrors++;
855 return (ENOMEM);
856 }
857 bcopy(&ifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *));
858 m_tag_prepend(m, mtag);
859
860 return (0);
861 }
862
863 static void
864 carp_send_ad_all(void)
865 {
866 struct carp_softc *sc;
867
868 mtx_lock(&carp_mtx);
869 LIST_FOREACH(sc, &carpif_list, sc_next) {
870 if (sc->sc_carpdev == NULL)
871 continue;
872 CARP_SCLOCK(sc);
873 if ((SC2IFP(sc)->if_flags & IFF_UP) &&
874 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING) &&
875 sc->sc_state == MASTER)
876 carp_send_ad_locked(sc);
877 CARP_SCUNLOCK(sc);
878 }
879 mtx_unlock(&carp_mtx);
880 }
881
882 static void
883 carp_send_ad(void *v)
884 {
885 struct carp_softc *sc = v;
886
887 CARP_SCLOCK(sc);
888 carp_send_ad_locked(sc);
889 CARP_SCUNLOCK(sc);
890 }
891
892 static void
893 carp_send_ad_locked(struct carp_softc *sc)
894 {
895 struct carp_header ch;
896 struct timeval tv;
897 struct carp_header *ch_ptr;
898 struct mbuf *m;
899 int len, advbase, advskew;
900
901 CARP_SCLOCK_ASSERT(sc);
902
903 /* bow out if we've lost our UPness or RUNNINGuiness */
904 if (!((SC2IFP(sc)->if_flags & IFF_UP) &&
905 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) {
906 advbase = 255;
907 advskew = 255;
908 } else {
909 advbase = sc->sc_advbase;
910 if (!carp_suppress_preempt || sc->sc_advskew > 240)
911 advskew = sc->sc_advskew;
912 else
913 advskew = 240;
914 tv.tv_sec = advbase;
915 tv.tv_usec = advskew * 1000000 / 256;
916 }
917
918 ch.carp_version = CARP_VERSION;
919 ch.carp_type = CARP_ADVERTISEMENT;
920 ch.carp_vhid = sc->sc_vhid;
921 ch.carp_advbase = advbase;
922 ch.carp_advskew = advskew;
923 ch.carp_authlen = 7; /* XXX DEFINE */
924 ch.carp_pad1 = 0; /* must be zero */
925 ch.carp_cksum = 0;
926
927 #ifdef INET
928 if (sc->sc_ia) {
929 struct ip *ip;
930
931 MGETHDR(m, M_DONTWAIT, MT_HEADER);
932 if (m == NULL) {
933 SC2IFP(sc)->if_oerrors++;
934 CARPSTATS_INC(carps_onomem);
935 /* XXX maybe less ? */
936 if (advbase != 255 || advskew != 255)
937 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
938 carp_send_ad, sc);
939 return;
940 }
941 len = sizeof(*ip) + sizeof(ch);
942 m->m_pkthdr.len = len;
943 m->m_pkthdr.rcvif = NULL;
944 m->m_len = len;
945 MH_ALIGN(m, m->m_len);
946 m->m_flags |= M_MCAST;
947 ip = mtod(m, struct ip *);
948 ip->ip_v = IPVERSION;
949 ip->ip_hl = sizeof(*ip) >> 2;
950 ip->ip_tos = IPTOS_LOWDELAY;
951 ip->ip_len = len;
952 ip->ip_id = ip_newid();
953 ip->ip_off = IP_DF;
954 ip->ip_ttl = CARP_DFLTTL;
955 ip->ip_p = IPPROTO_CARP;
956 ip->ip_sum = 0;
957 ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr;
958 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
959
960 ch_ptr = (struct carp_header *)(&ip[1]);
961 bcopy(&ch, ch_ptr, sizeof(ch));
962 if (carp_prepare_ad(m, sc, ch_ptr))
963 return;
964
965 m->m_data += sizeof(*ip);
966 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip));
967 m->m_data -= sizeof(*ip);
968
969 getmicrotime(&SC2IFP(sc)->if_lastchange);
970 SC2IFP(sc)->if_opackets++;
971 SC2IFP(sc)->if_obytes += len;
972 CARPSTATS_INC(carps_opackets);
973
974 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) {
975 SC2IFP(sc)->if_oerrors++;
976 if (sc->sc_sendad_errors < INT_MAX)
977 sc->sc_sendad_errors++;
978 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
979 carp_suppress_preempt++;
980 if (carp_suppress_preempt == 1) {
981 CARP_SCUNLOCK(sc);
982 carp_send_ad_all();
983 CARP_SCLOCK(sc);
984 }
985 }
986 sc->sc_sendad_success = 0;
987 } else {
988 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
989 if (++sc->sc_sendad_success >=
990 CARP_SENDAD_MIN_SUCCESS) {
991 carp_suppress_preempt--;
992 sc->sc_sendad_errors = 0;
993 }
994 } else
995 sc->sc_sendad_errors = 0;
996 }
997 }
998 #endif /* INET */
999 #ifdef INET6
1000 if (sc->sc_ia6) {
1001 struct ip6_hdr *ip6;
1002
1003 MGETHDR(m, M_DONTWAIT, MT_HEADER);
1004 if (m == NULL) {
1005 SC2IFP(sc)->if_oerrors++;
1006 CARPSTATS_INC(carps_onomem);
1007 /* XXX maybe less ? */
1008 if (advbase != 255 || advskew != 255)
1009 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1010 carp_send_ad, sc);
1011 return;
1012 }
1013 len = sizeof(*ip6) + sizeof(ch);
1014 m->m_pkthdr.len = len;
1015 m->m_pkthdr.rcvif = NULL;
1016 m->m_len = len;
1017 MH_ALIGN(m, m->m_len);
1018 m->m_flags |= M_MCAST;
1019 ip6 = mtod(m, struct ip6_hdr *);
1020 bzero(ip6, sizeof(*ip6));
1021 ip6->ip6_vfc |= IPV6_VERSION;
1022 ip6->ip6_hlim = CARP_DFLTTL;
1023 ip6->ip6_nxt = IPPROTO_CARP;
1024 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src,
1025 sizeof(struct in6_addr));
1026 /* set the multicast destination */
1027
1028 ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
1029 ip6->ip6_dst.s6_addr8[15] = 0x12;
1030 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
1031 SC2IFP(sc)->if_oerrors++;
1032 m_freem(m);
1033 CARP_DEBUG("%s: in6_setscope failed\n", __func__);
1034 return;
1035 }
1036
1037 ch_ptr = (struct carp_header *)(&ip6[1]);
1038 bcopy(&ch, ch_ptr, sizeof(ch));
1039 if (carp_prepare_ad(m, sc, ch_ptr))
1040 return;
1041
1042 m->m_data += sizeof(*ip6);
1043 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6));
1044 m->m_data -= sizeof(*ip6);
1045
1046 getmicrotime(&SC2IFP(sc)->if_lastchange);
1047 SC2IFP(sc)->if_opackets++;
1048 SC2IFP(sc)->if_obytes += len;
1049 CARPSTATS_INC(carps_opackets6);
1050
1051 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) {
1052 SC2IFP(sc)->if_oerrors++;
1053 if (sc->sc_sendad_errors < INT_MAX)
1054 sc->sc_sendad_errors++;
1055 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1056 carp_suppress_preempt++;
1057 if (carp_suppress_preempt == 1) {
1058 CARP_SCUNLOCK(sc);
1059 carp_send_ad_all();
1060 CARP_SCLOCK(sc);
1061 }
1062 }
1063 sc->sc_sendad_success = 0;
1064 } else {
1065 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1066 if (++sc->sc_sendad_success >=
1067 CARP_SENDAD_MIN_SUCCESS) {
1068 carp_suppress_preempt--;
1069 sc->sc_sendad_errors = 0;
1070 }
1071 } else
1072 sc->sc_sendad_errors = 0;
1073 }
1074 }
1075 #endif /* INET6 */
1076
1077 if (advbase != 255 || advskew != 255)
1078 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1079 carp_send_ad, sc);
1080
1081 }
1082
1083 /*
1084 * Broadcast a gratuitous ARP request containing
1085 * the virtual router MAC address for each IP address
1086 * associated with the virtual router.
1087 */
1088 static void
1089 carp_send_arp(struct carp_softc *sc)
1090 {
1091 struct ifaddr *ifa;
1092
1093 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1094
1095 if (ifa->ifa_addr->sa_family != AF_INET)
1096 continue;
1097
1098 /* arprequest(sc->sc_carpdev, &in, &in, IF_LLADDR(sc->sc_ifp)); */
1099 arp_ifinit2(sc->sc_carpdev, ifa, IF_LLADDR(sc->sc_ifp));
1100
1101 DELAY(1000); /* XXX */
1102 }
1103 }
1104
1105 #ifdef INET6
1106 static void
1107 carp_send_na(struct carp_softc *sc)
1108 {
1109 struct ifaddr *ifa;
1110 struct in6_addr *in6;
1111 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1112
1113 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1114
1115 if (ifa->ifa_addr->sa_family != AF_INET6)
1116 continue;
1117
1118 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
1119 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1120 ND_NA_FLAG_OVERRIDE, 1, NULL);
1121 DELAY(1000); /* XXX */
1122 }
1123 }
1124 #endif /* INET6 */
1125
1126 static int
1127 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type)
1128 {
1129 struct carp_softc *vh;
1130 struct ifaddr *ifa;
1131 int count = 0;
1132
1133 CARP_LOCK_ASSERT(cif);
1134
1135 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1136 if ((type == CARP_COUNT_RUNNING &&
1137 (SC2IFP(vh)->if_flags & IFF_UP) &&
1138 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) ||
1139 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) {
1140 IF_ADDR_LOCK(SC2IFP(vh));
1141 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist,
1142 ifa_list) {
1143 if (ifa->ifa_addr->sa_family == AF_INET &&
1144 ia->ia_addr.sin_addr.s_addr ==
1145 ifatoia(ifa)->ia_addr.sin_addr.s_addr)
1146 count++;
1147 }
1148 IF_ADDR_UNLOCK(SC2IFP(vh));
1149 }
1150 }
1151 return (count);
1152 }
1153
1154 int
1155 carp_iamatch(struct ifnet *ifp, struct in_ifaddr *ia,
1156 struct in_addr *isaddr, u_int8_t **enaddr)
1157 {
1158 struct carp_if *cif;
1159 struct carp_softc *vh;
1160 int index, count = 0;
1161 struct ifaddr *ifa;
1162
1163 cif = ifp->if_carp;
1164 CARP_LOCK(cif);
1165
1166 if (carp_opts[CARPCTL_ARPBALANCE]) {
1167 /*
1168 * XXX proof of concept implementation.
1169 * We use the source ip to decide which virtual host should
1170 * handle the request. If we're master of that virtual host,
1171 * then we respond, otherwise, just drop the arp packet on
1172 * the floor.
1173 */
1174 count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING);
1175 if (count == 0) {
1176 /* should never reach this */
1177 CARP_UNLOCK(cif);
1178 return (0);
1179 }
1180
1181 /* this should be a hash, like pf_hash() */
1182 index = ntohl(isaddr->s_addr) % count;
1183 count = 0;
1184
1185 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1186 if ((SC2IFP(vh)->if_flags & IFF_UP) &&
1187 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) {
1188 IF_ADDR_LOCK(SC2IFP(vh));
1189 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist,
1190 ifa_list) {
1191 if (ifa->ifa_addr->sa_family ==
1192 AF_INET &&
1193 ia->ia_addr.sin_addr.s_addr ==
1194 ifatoia(ifa)->ia_addr.sin_addr.s_addr) {
1195 if (count == index) {
1196 if (vh->sc_state ==
1197 MASTER) {
1198 *enaddr = IF_LLADDR(vh->sc_ifp);
1199 IF_ADDR_UNLOCK(SC2IFP(vh));
1200 CARP_UNLOCK(cif);
1201 return (1);
1202 } else {
1203 IF_ADDR_UNLOCK(SC2IFP(vh));
1204 CARP_UNLOCK(cif);
1205 return (0);
1206 }
1207 }
1208 count++;
1209 }
1210 }
1211 IF_ADDR_UNLOCK(SC2IFP(vh));
1212 }
1213 }
1214 } else {
1215 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1216 if ((SC2IFP(vh)->if_flags & IFF_UP) &&
1217 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
1218 ia->ia_ifp == SC2IFP(vh) &&
1219 vh->sc_state == MASTER) {
1220 *enaddr = IF_LLADDR(vh->sc_ifp);
1221 CARP_UNLOCK(cif);
1222 return (1);
1223 }
1224 }
1225 }
1226 CARP_UNLOCK(cif);
1227 return (0);
1228 }
1229
1230 #ifdef INET6
1231 struct ifaddr *
1232 carp_iamatch6(struct ifnet *ifp, struct in6_addr *taddr)
1233 {
1234 struct carp_if *cif;
1235 struct carp_softc *vh;
1236 struct ifaddr *ifa;
1237
1238 cif = ifp->if_carp;
1239 CARP_LOCK(cif);
1240 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1241 IF_ADDR_LOCK(SC2IFP(vh));
1242 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, ifa_list) {
1243 if (IN6_ARE_ADDR_EQUAL(taddr,
1244 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1245 (SC2IFP(vh)->if_flags & IFF_UP) &&
1246 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
1247 vh->sc_state == MASTER) {
1248 ifa_ref(ifa);
1249 IF_ADDR_UNLOCK(SC2IFP(vh));
1250 CARP_UNLOCK(cif);
1251 return (ifa);
1252 }
1253 }
1254 IF_ADDR_UNLOCK(SC2IFP(vh));
1255 }
1256 CARP_UNLOCK(cif);
1257
1258 return (NULL);
1259 }
1260
1261 caddr_t
1262 carp_macmatch6(struct ifnet *ifp, struct mbuf *m, const struct in6_addr *taddr)
1263 {
1264 struct m_tag *mtag;
1265 struct carp_if *cif;
1266 struct carp_softc *sc;
1267 struct ifaddr *ifa;
1268
1269 cif = ifp->if_carp;
1270 CARP_LOCK(cif);
1271 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
1272 IF_ADDR_LOCK(SC2IFP(sc));
1273 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1274 if (IN6_ARE_ADDR_EQUAL(taddr,
1275 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1276 (SC2IFP(sc)->if_flags & IFF_UP) &&
1277 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING)) {
1278 struct ifnet *ifp = SC2IFP(sc);
1279 mtag = m_tag_get(PACKET_TAG_CARP,
1280 sizeof(struct ifnet *), M_NOWAIT);
1281 if (mtag == NULL) {
1282 /* better a bit than nothing */
1283 IF_ADDR_UNLOCK(SC2IFP(sc));
1284 CARP_UNLOCK(cif);
1285 return (IF_LLADDR(sc->sc_ifp));
1286 }
1287 bcopy(&ifp, (caddr_t)(mtag + 1),
1288 sizeof(struct ifnet *));
1289 m_tag_prepend(m, mtag);
1290
1291 IF_ADDR_UNLOCK(SC2IFP(sc));
1292 CARP_UNLOCK(cif);
1293 return (IF_LLADDR(sc->sc_ifp));
1294 }
1295 }
1296 IF_ADDR_UNLOCK(SC2IFP(sc));
1297 }
1298 CARP_UNLOCK(cif);
1299
1300 return (NULL);
1301 }
1302 #endif
1303
1304 struct ifnet *
1305 carp_forus(struct ifnet *ifp, u_char *dhost)
1306 {
1307 struct carp_if *cif;
1308 struct carp_softc *vh;
1309 u_int8_t *ena = dhost;
1310
1311 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
1312 return (NULL);
1313
1314 cif = ifp->if_carp;
1315 CARP_LOCK(cif);
1316 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list)
1317 if ((SC2IFP(vh)->if_flags & IFF_UP) &&
1318 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
1319 vh->sc_state == MASTER &&
1320 !bcmp(dhost, IF_LLADDR(vh->sc_ifp), ETHER_ADDR_LEN)) {
1321 CARP_UNLOCK(cif);
1322 return (SC2IFP(vh));
1323 }
1324
1325 CARP_UNLOCK(cif);
1326 return (NULL);
1327 }
1328
1329 static void
1330 carp_master_down(void *v)
1331 {
1332 struct carp_softc *sc = v;
1333
1334 CARP_SCLOCK(sc);
1335 carp_master_down_locked(sc);
1336 CARP_SCUNLOCK(sc);
1337 }
1338
1339 static void
1340 carp_master_down_locked(struct carp_softc *sc)
1341 {
1342 if (sc->sc_carpdev)
1343 CARP_SCLOCK_ASSERT(sc);
1344
1345 switch (sc->sc_state) {
1346 case INIT:
1347 printf("%s: master_down event in INIT state\n",
1348 SC2IFP(sc)->if_xname);
1349 break;
1350 case MASTER:
1351 break;
1352 case BACKUP:
1353 carp_set_state(sc, MASTER);
1354 carp_send_ad_locked(sc);
1355 carp_send_arp(sc);
1356 #ifdef INET6
1357 carp_send_na(sc);
1358 #endif /* INET6 */
1359 carp_setrun(sc, 0);
1360 carp_setroute(sc, RTM_ADD);
1361 break;
1362 }
1363 }
1364
1365 /*
1366 * When in backup state, af indicates whether to reset the master down timer
1367 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1368 */
1369 static void
1370 carp_setrun(struct carp_softc *sc, sa_family_t af)
1371 {
1372 struct timeval tv;
1373
1374 if (sc->sc_carpdev == NULL) {
1375 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1376 carp_set_state(sc, INIT);
1377 return;
1378 } else
1379 CARP_SCLOCK_ASSERT(sc);
1380
1381 if (SC2IFP(sc)->if_flags & IFF_UP &&
1382 sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6) &&
1383 sc->sc_carpdev->if_link_state == LINK_STATE_UP)
1384 SC2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING;
1385 else {
1386 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1387 carp_setroute(sc, RTM_DELETE);
1388 return;
1389 }
1390
1391 switch (sc->sc_state) {
1392 case INIT:
1393 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) {
1394 carp_send_ad_locked(sc);
1395 carp_send_arp(sc);
1396 #ifdef INET6
1397 carp_send_na(sc);
1398 #endif /* INET6 */
1399 CARP_LOG("%s: INIT -> MASTER (preempting)\n",
1400 SC2IFP(sc)->if_xname);
1401 carp_set_state(sc, MASTER);
1402 carp_setroute(sc, RTM_ADD);
1403 } else {
1404 CARP_LOG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname);
1405 carp_set_state(sc, BACKUP);
1406 carp_setroute(sc, RTM_DELETE);
1407 carp_setrun(sc, 0);
1408 }
1409 break;
1410 case BACKUP:
1411 callout_stop(&sc->sc_ad_tmo);
1412 tv.tv_sec = 3 * sc->sc_advbase;
1413 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1414 switch (af) {
1415 #ifdef INET
1416 case AF_INET:
1417 callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
1418 carp_master_down, sc);
1419 break;
1420 #endif /* INET */
1421 #ifdef INET6
1422 case AF_INET6:
1423 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
1424 carp_master_down, sc);
1425 break;
1426 #endif /* INET6 */
1427 default:
1428 if (sc->sc_naddrs)
1429 callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
1430 carp_master_down, sc);
1431 if (sc->sc_naddrs6)
1432 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
1433 carp_master_down, sc);
1434 break;
1435 }
1436 break;
1437 case MASTER:
1438 tv.tv_sec = sc->sc_advbase;
1439 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1440 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1441 carp_send_ad, sc);
1442 break;
1443 }
1444 }
1445
1446 static void
1447 carp_multicast_cleanup(struct carp_softc *sc)
1448 {
1449 struct ip_moptions *imo = &sc->sc_imo;
1450 u_int16_t n = imo->imo_num_memberships;
1451
1452 /* Clean up our own multicast memberships */
1453 while (n-- > 0) {
1454 if (imo->imo_membership[n] != NULL) {
1455 in_delmulti(imo->imo_membership[n]);
1456 imo->imo_membership[n] = NULL;
1457 }
1458 }
1459 KASSERT(imo->imo_mfilters == NULL,
1460 ("%s: imo_mfilters != NULL", __func__));
1461 imo->imo_num_memberships = 0;
1462 imo->imo_multicast_ifp = NULL;
1463 }
1464
1465 #ifdef INET6
1466 static void
1467 carp_multicast6_cleanup(struct carp_softc *sc)
1468 {
1469 struct ip6_moptions *im6o = &sc->sc_im6o;
1470 u_int16_t n = im6o->im6o_num_memberships;
1471
1472 while (n-- > 0) {
1473 if (im6o->im6o_membership[n] != NULL) {
1474 in6_mc_leave(im6o->im6o_membership[n], NULL);
1475 im6o->im6o_membership[n] = NULL;
1476 }
1477 }
1478 KASSERT(im6o->im6o_mfilters == NULL,
1479 ("%s: im6o_mfilters != NULL", __func__));
1480 im6o->im6o_num_memberships = 0;
1481 im6o->im6o_multicast_ifp = NULL;
1482 }
1483 #endif
1484
1485 static int
1486 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1487 {
1488 struct ifnet *ifp;
1489 struct carp_if *cif;
1490 struct in_ifaddr *ia, *ia_if;
1491 struct ip_moptions *imo = &sc->sc_imo;
1492 struct in_addr addr;
1493 u_long iaddr = htonl(sin->sin_addr.s_addr);
1494 int own, error;
1495
1496 if (sin->sin_addr.s_addr == 0) {
1497 if (!(SC2IFP(sc)->if_flags & IFF_UP))
1498 carp_set_state(sc, INIT);
1499 if (sc->sc_naddrs)
1500 SC2IFP(sc)->if_flags |= IFF_UP;
1501 if (sc->sc_carpdev)
1502 CARP_SCLOCK(sc);
1503 carp_setrun(sc, 0);
1504 if (sc->sc_carpdev)
1505 CARP_SCUNLOCK(sc);
1506 return (0);
1507 }
1508
1509 /* we have to do it by hands to check we won't match on us */
1510 ia_if = NULL; own = 0;
1511 IN_IFADDR_RLOCK();
1512 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1513 /* and, yeah, we need a multicast-capable iface too */
1514 if (ia->ia_ifp != SC2IFP(sc) &&
1515 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1516 (iaddr & ia->ia_subnetmask) == ia->ia_subnet) {
1517 if (!ia_if)
1518 ia_if = ia;
1519 if (sin->sin_addr.s_addr ==
1520 ia->ia_addr.sin_addr.s_addr)
1521 own++;
1522 }
1523 }
1524
1525 if (!ia_if) {
1526 IN_IFADDR_RUNLOCK();
1527 return (EADDRNOTAVAIL);
1528 }
1529
1530 ia = ia_if;
1531 ifa_ref(&ia->ia_ifa);
1532 IN_IFADDR_RUNLOCK();
1533
1534 ifp = ia->ia_ifp;
1535
1536 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1537 (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp)) {
1538 ifa_free(&ia->ia_ifa);
1539 return (EADDRNOTAVAIL);
1540 }
1541
1542 if (imo->imo_num_memberships == 0) {
1543 addr.s_addr = htonl(INADDR_CARP_GROUP);
1544 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) ==
1545 NULL) {
1546 ifa_free(&ia->ia_ifa);
1547 return (ENOBUFS);
1548 }
1549 imo->imo_num_memberships++;
1550 imo->imo_multicast_ifp = ifp;
1551 imo->imo_multicast_ttl = CARP_DFLTTL;
1552 imo->imo_multicast_loop = 0;
1553 }
1554
1555 if (!ifp->if_carp) {
1556
1557 cif = malloc(sizeof(*cif), M_CARP,
1558 M_WAITOK|M_ZERO);
1559 if (!cif) {
1560 error = ENOBUFS;
1561 goto cleanup;
1562 }
1563 if ((error = ifpromisc(ifp, 1))) {
1564 free(cif, M_CARP);
1565 goto cleanup;
1566 }
1567
1568 CARP_LOCK_INIT(cif);
1569 CARP_LOCK(cif);
1570 cif->vhif_ifp = ifp;
1571 TAILQ_INIT(&cif->vhif_vrs);
1572 ifp->if_carp = cif;
1573
1574 } else {
1575 struct carp_softc *vr;
1576
1577 cif = (struct carp_if *)ifp->if_carp;
1578 CARP_LOCK(cif);
1579 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1580 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1581 CARP_UNLOCK(cif);
1582 error = EEXIST;
1583 goto cleanup;
1584 }
1585 }
1586 sc->sc_ia = ia;
1587 sc->sc_carpdev = ifp;
1588
1589 { /* XXX prevent endless loop if already in queue */
1590 struct carp_softc *vr, *after = NULL;
1591 int myself = 0;
1592 cif = (struct carp_if *)ifp->if_carp;
1593
1594 /* XXX: cif should not change, right? So we still hold the lock */
1595 CARP_LOCK_ASSERT(cif);
1596
1597 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1598 if (vr == sc)
1599 myself = 1;
1600 if (vr->sc_vhid < sc->sc_vhid)
1601 after = vr;
1602 }
1603
1604 if (!myself) {
1605 /* We're trying to keep things in order */
1606 if (after == NULL) {
1607 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1608 } else {
1609 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1610 }
1611 cif->vhif_nvrs++;
1612 }
1613 }
1614
1615 sc->sc_naddrs++;
1616 SC2IFP(sc)->if_flags |= IFF_UP;
1617 if (own)
1618 sc->sc_advskew = 0;
1619 carp_sc_state_locked(sc);
1620 carp_setrun(sc, 0);
1621
1622 CARP_UNLOCK(cif);
1623 ifa_free(&ia->ia_ifa); /* XXXRW: should hold reference for softc. */
1624
1625 return (0);
1626
1627 cleanup:
1628 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1629 ifa_free(&ia->ia_ifa);
1630 return (error);
1631 }
1632
1633 static int
1634 carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1635 {
1636 int error = 0;
1637
1638 if (!--sc->sc_naddrs) {
1639 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1640 struct ip_moptions *imo = &sc->sc_imo;
1641
1642 CARP_LOCK(cif);
1643 callout_stop(&sc->sc_ad_tmo);
1644 SC2IFP(sc)->if_flags &= ~IFF_UP;
1645 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1646 sc->sc_vhid = -1;
1647 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1648 imo->imo_multicast_ifp = NULL;
1649 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1650 if (!--cif->vhif_nvrs) {
1651 sc->sc_carpdev->if_carp = NULL;
1652 CARP_LOCK_DESTROY(cif);
1653 free(cif, M_CARP);
1654 } else {
1655 CARP_UNLOCK(cif);
1656 }
1657 }
1658
1659 return (error);
1660 }
1661
1662 #ifdef INET6
1663 static int
1664 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1665 {
1666 struct ifnet *ifp;
1667 struct carp_if *cif;
1668 struct in6_ifaddr *ia, *ia_if;
1669 struct ip6_moptions *im6o = &sc->sc_im6o;
1670 struct in6_addr in6;
1671 int own, error;
1672
1673 error = 0;
1674
1675 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1676 if (!(SC2IFP(sc)->if_flags & IFF_UP))
1677 carp_set_state(sc, INIT);
1678 if (sc->sc_naddrs6)
1679 SC2IFP(sc)->if_flags |= IFF_UP;
1680 if (sc->sc_carpdev)
1681 CARP_SCLOCK(sc);
1682 carp_setrun(sc, 0);
1683 if (sc->sc_carpdev)
1684 CARP_SCUNLOCK(sc);
1685 return (0);
1686 }
1687
1688 /* we have to do it by hands to check we won't match on us */
1689 ia_if = NULL; own = 0;
1690 IN6_IFADDR_RLOCK();
1691 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
1692 int i;
1693
1694 for (i = 0; i < 4; i++) {
1695 if ((sin6->sin6_addr.s6_addr32[i] &
1696 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
1697 (ia->ia_addr.sin6_addr.s6_addr32[i] &
1698 ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
1699 break;
1700 }
1701 /* and, yeah, we need a multicast-capable iface too */
1702 if (ia->ia_ifp != SC2IFP(sc) &&
1703 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1704 (i == 4)) {
1705 if (!ia_if)
1706 ia_if = ia;
1707 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
1708 &ia->ia_addr.sin6_addr))
1709 own++;
1710 }
1711 }
1712
1713 if (!ia_if) {
1714 IN6_IFADDR_RUNLOCK();
1715 return (EADDRNOTAVAIL);
1716 }
1717 ia = ia_if;
1718 ifa_ref(&ia->ia_ifa);
1719 IN6_IFADDR_RUNLOCK();
1720 ifp = ia->ia_ifp;
1721
1722 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1723 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp)) {
1724 ifa_free(&ia->ia_ifa);
1725 return (EADDRNOTAVAIL);
1726 }
1727
1728 if (!sc->sc_naddrs6) {
1729 struct in6_multi *in6m;
1730
1731 im6o->im6o_multicast_ifp = ifp;
1732
1733 /* join CARP multicast address */
1734 bzero(&in6, sizeof(in6));
1735 in6.s6_addr16[0] = htons(0xff02);
1736 in6.s6_addr8[15] = 0x12;
1737 if (in6_setscope(&in6, ifp, NULL) != 0)
1738 goto cleanup;
1739 in6m = NULL;
1740 error = in6_mc_join(ifp, &in6, NULL, &in6m, 0);
1741 if (error)
1742 goto cleanup;
1743 im6o->im6o_membership[0] = in6m;
1744 im6o->im6o_num_memberships++;
1745
1746 /* join solicited multicast address */
1747 bzero(&in6, sizeof(in6));
1748 in6.s6_addr16[0] = htons(0xff02);
1749 in6.s6_addr32[1] = 0;
1750 in6.s6_addr32[2] = htonl(1);
1751 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3];
1752 in6.s6_addr8[12] = 0xff;
1753 if (in6_setscope(&in6, ifp, NULL) != 0)
1754 goto cleanup;
1755 in6m = NULL;
1756 error = in6_mc_join(ifp, &in6, NULL, &in6m, 0);
1757 if (error)
1758 goto cleanup;
1759 im6o->im6o_membership[1] = in6m;
1760 im6o->im6o_num_memberships++;
1761 }
1762
1763 if (!ifp->if_carp) {
1764 cif = malloc(sizeof(*cif), M_CARP,
1765 M_WAITOK|M_ZERO);
1766 if (!cif) {
1767 error = ENOBUFS;
1768 goto cleanup;
1769 }
1770 if ((error = ifpromisc(ifp, 1))) {
1771 free(cif, M_CARP);
1772 goto cleanup;
1773 }
1774
1775 CARP_LOCK_INIT(cif);
1776 CARP_LOCK(cif);
1777 cif->vhif_ifp = ifp;
1778 TAILQ_INIT(&cif->vhif_vrs);
1779 ifp->if_carp = cif;
1780
1781 } else {
1782 struct carp_softc *vr;
1783
1784 cif = (struct carp_if *)ifp->if_carp;
1785 CARP_LOCK(cif);
1786 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1787 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1788 CARP_UNLOCK(cif);
1789 error = EINVAL;
1790 goto cleanup;
1791 }
1792 }
1793 sc->sc_ia6 = ia;
1794 sc->sc_carpdev = ifp;
1795
1796 { /* XXX prevent endless loop if already in queue */
1797 struct carp_softc *vr, *after = NULL;
1798 int myself = 0;
1799 cif = (struct carp_if *)ifp->if_carp;
1800 CARP_LOCK_ASSERT(cif);
1801
1802 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1803 if (vr == sc)
1804 myself = 1;
1805 if (vr->sc_vhid < sc->sc_vhid)
1806 after = vr;
1807 }
1808
1809 if (!myself) {
1810 /* We're trying to keep things in order */
1811 if (after == NULL) {
1812 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1813 } else {
1814 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1815 }
1816 cif->vhif_nvrs++;
1817 }
1818 }
1819
1820 sc->sc_naddrs6++;
1821 SC2IFP(sc)->if_flags |= IFF_UP;
1822 if (own)
1823 sc->sc_advskew = 0;
1824 carp_sc_state_locked(sc);
1825 carp_setrun(sc, 0);
1826
1827 CARP_UNLOCK(cif);
1828 ifa_free(&ia->ia_ifa); /* XXXRW: should hold reference for softc. */
1829
1830 return (0);
1831
1832 cleanup:
1833 if (!sc->sc_naddrs6)
1834 carp_multicast6_cleanup(sc);
1835 ifa_free(&ia->ia_ifa);
1836 return (error);
1837 }
1838
1839 static int
1840 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1841 {
1842 int error = 0;
1843
1844 if (!--sc->sc_naddrs6) {
1845 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1846
1847 CARP_LOCK(cif);
1848 callout_stop(&sc->sc_ad_tmo);
1849 SC2IFP(sc)->if_flags &= ~IFF_UP;
1850 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1851 sc->sc_vhid = -1;
1852 carp_multicast6_cleanup(sc);
1853 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1854 if (!--cif->vhif_nvrs) {
1855 CARP_LOCK_DESTROY(cif);
1856 sc->sc_carpdev->if_carp = NULL;
1857 free(cif, M_CARP);
1858 } else
1859 CARP_UNLOCK(cif);
1860 }
1861
1862 return (error);
1863 }
1864 #endif /* INET6 */
1865
1866 static int
1867 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr)
1868 {
1869 struct carp_softc *sc = ifp->if_softc, *vr;
1870 struct carpreq carpr;
1871 struct ifaddr *ifa;
1872 struct ifreq *ifr;
1873 struct ifaliasreq *ifra;
1874 int locked = 0, error = 0;
1875
1876 ifa = (struct ifaddr *)addr;
1877 ifra = (struct ifaliasreq *)addr;
1878 ifr = (struct ifreq *)addr;
1879
1880 switch (cmd) {
1881 case SIOCSIFADDR:
1882 switch (ifa->ifa_addr->sa_family) {
1883 #ifdef INET
1884 case AF_INET:
1885 SC2IFP(sc)->if_flags |= IFF_UP;
1886 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1887 sizeof(struct sockaddr));
1888 error = carp_set_addr(sc, satosin(ifa->ifa_addr));
1889 break;
1890 #endif /* INET */
1891 #ifdef INET6
1892 case AF_INET6:
1893 SC2IFP(sc)->if_flags |= IFF_UP;
1894 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr));
1895 break;
1896 #endif /* INET6 */
1897 default:
1898 error = EAFNOSUPPORT;
1899 break;
1900 }
1901 break;
1902
1903 case SIOCAIFADDR:
1904 switch (ifa->ifa_addr->sa_family) {
1905 #ifdef INET
1906 case AF_INET:
1907 SC2IFP(sc)->if_flags |= IFF_UP;
1908 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1909 sizeof(struct sockaddr));
1910 error = carp_set_addr(sc, satosin(&ifra->ifra_addr));
1911 break;
1912 #endif /* INET */
1913 #ifdef INET6
1914 case AF_INET6:
1915 SC2IFP(sc)->if_flags |= IFF_UP;
1916 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr));
1917 break;
1918 #endif /* INET6 */
1919 default:
1920 error = EAFNOSUPPORT;
1921 break;
1922 }
1923 break;
1924
1925 case SIOCDIFADDR:
1926 switch (ifa->ifa_addr->sa_family) {
1927 #ifdef INET
1928 case AF_INET:
1929 error = carp_del_addr(sc, satosin(&ifra->ifra_addr));
1930 break;
1931 #endif /* INET */
1932 #ifdef INET6
1933 case AF_INET6:
1934 error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr));
1935 break;
1936 #endif /* INET6 */
1937 default:
1938 error = EAFNOSUPPORT;
1939 break;
1940 }
1941 break;
1942
1943 case SIOCSIFFLAGS:
1944 if (sc->sc_carpdev) {
1945 locked = 1;
1946 CARP_SCLOCK(sc);
1947 }
1948 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) {
1949 callout_stop(&sc->sc_ad_tmo);
1950 callout_stop(&sc->sc_md_tmo);
1951 callout_stop(&sc->sc_md6_tmo);
1952 if (sc->sc_state == MASTER)
1953 carp_send_ad_locked(sc);
1954 carp_set_state(sc, INIT);
1955 carp_setrun(sc, 0);
1956 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) {
1957 SC2IFP(sc)->if_flags |= IFF_UP;
1958 carp_setrun(sc, 0);
1959 }
1960 break;
1961
1962 case SIOCSVH:
1963 error = priv_check(curthread, PRIV_NETINET_CARP);
1964 if (error)
1965 break;
1966 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr)))
1967 break;
1968 error = 1;
1969 if (sc->sc_carpdev) {
1970 locked = 1;
1971 CARP_SCLOCK(sc);
1972 }
1973 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) {
1974 switch (carpr.carpr_state) {
1975 case BACKUP:
1976 callout_stop(&sc->sc_ad_tmo);
1977 carp_set_state(sc, BACKUP);
1978 carp_setrun(sc, 0);
1979 carp_setroute(sc, RTM_DELETE);
1980 break;
1981 case MASTER:
1982 carp_master_down_locked(sc);
1983 break;
1984 default:
1985 break;
1986 }
1987 }
1988 if (carpr.carpr_vhid > 0) {
1989 if (carpr.carpr_vhid > 255) {
1990 error = EINVAL;
1991 break;
1992 }
1993 if (sc->sc_carpdev) {
1994 struct carp_if *cif;
1995 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1996 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1997 if (vr != sc &&
1998 vr->sc_vhid == carpr.carpr_vhid) {
1999 error = EEXIST;
2000 break;
2001 }
2002 if (error == EEXIST)
2003 break;
2004 }
2005 sc->sc_vhid = carpr.carpr_vhid;
2006 IF_LLADDR(sc->sc_ifp)[0] = 0;
2007 IF_LLADDR(sc->sc_ifp)[1] = 0;
2008 IF_LLADDR(sc->sc_ifp)[2] = 0x5e;
2009 IF_LLADDR(sc->sc_ifp)[3] = 0;
2010 IF_LLADDR(sc->sc_ifp)[4] = 1;
2011 IF_LLADDR(sc->sc_ifp)[5] = sc->sc_vhid;
2012 error--;
2013 }
2014 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) {
2015 if (carpr.carpr_advskew >= 255) {
2016 error = EINVAL;
2017 break;
2018 }
2019 if (carpr.carpr_advbase > 255) {
2020 error = EINVAL;
2021 break;
2022 }
2023 sc->sc_advbase = carpr.carpr_advbase;
2024 sc->sc_advskew = carpr.carpr_advskew;
2025 error--;
2026 }
2027 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key));
2028 if (error > 0)
2029 error = EINVAL;
2030 else {
2031 error = 0;
2032 carp_setrun(sc, 0);
2033 }
2034 break;
2035
2036 case SIOCGVH:
2037 /* XXX: lockless read */
2038 bzero(&carpr, sizeof(carpr));
2039 carpr.carpr_state = sc->sc_state;
2040 carpr.carpr_vhid = sc->sc_vhid;
2041 carpr.carpr_advbase = sc->sc_advbase;
2042 carpr.carpr_advskew = sc->sc_advskew;
2043 error = priv_check(curthread, PRIV_NETINET_CARP);
2044 if (error == 0)
2045 bcopy(sc->sc_key, carpr.carpr_key,
2046 sizeof(carpr.carpr_key));
2047 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
2048 break;
2049
2050 default:
2051 error = EINVAL;
2052 }
2053
2054 if (locked)
2055 CARP_SCUNLOCK(sc);
2056
2057 carp_hmac_prepare(sc);
2058
2059 return (error);
2060 }
2061
2062 /*
2063 * XXX: this is looutput. We should eventually use it from there.
2064 */
2065 static int
2066 carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
2067 struct route *ro)
2068 {
2069 u_int32_t af;
2070 struct rtentry *rt = NULL;
2071
2072 M_ASSERTPKTHDR(m); /* check if we have the packet header */
2073
2074 if (ro != NULL)
2075 rt = ro->ro_rt;
2076 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
2077 m_freem(m);
2078 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
2079 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
2080 }
2081
2082 ifp->if_opackets++;
2083 ifp->if_obytes += m->m_pkthdr.len;
2084
2085 /* BPF writes need to be handled specially. */
2086 if (dst->sa_family == AF_UNSPEC) {
2087 bcopy(dst->sa_data, &af, sizeof(af));
2088 dst->sa_family = af;
2089 }
2090
2091 #if 1 /* XXX */
2092 switch (dst->sa_family) {
2093 case AF_INET:
2094 case AF_INET6:
2095 case AF_IPX:
2096 case AF_APPLETALK:
2097 break;
2098 default:
2099 printf("carp_looutput: af=%d unexpected\n", dst->sa_family);
2100 m_freem(m);
2101 return (EAFNOSUPPORT);
2102 }
2103 #endif
2104 return(if_simloop(ifp, m, dst->sa_family, 0));
2105 }
2106
2107 /*
2108 * Start output on carp interface. This function should never be called.
2109 */
2110 static void
2111 carp_start(struct ifnet *ifp)
2112 {
2113 #ifdef DEBUG
2114 printf("%s: start called\n", ifp->if_xname);
2115 #endif
2116 }
2117
2118 int
2119 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
2120 struct rtentry *rt)
2121 {
2122 struct m_tag *mtag;
2123 struct carp_softc *sc;
2124 struct ifnet *carp_ifp;
2125
2126 if (!sa)
2127 return (0);
2128
2129 switch (sa->sa_family) {
2130 #ifdef INET
2131 case AF_INET:
2132 break;
2133 #endif /* INET */
2134 #ifdef INET6
2135 case AF_INET6:
2136 break;
2137 #endif /* INET6 */
2138 default:
2139 return (0);
2140 }
2141
2142 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL);
2143 if (mtag == NULL)
2144 return (0);
2145
2146 bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *));
2147 sc = carp_ifp->if_softc;
2148
2149 /* Set the source MAC address to Virtual Router MAC Address */
2150 switch (ifp->if_type) {
2151 case IFT_ETHER:
2152 case IFT_L2VLAN: {
2153 struct ether_header *eh;
2154
2155 eh = mtod(m, struct ether_header *);
2156 eh->ether_shost[0] = 0;
2157 eh->ether_shost[1] = 0;
2158 eh->ether_shost[2] = 0x5e;
2159 eh->ether_shost[3] = 0;
2160 eh->ether_shost[4] = 1;
2161 eh->ether_shost[5] = sc->sc_vhid;
2162 }
2163 break;
2164 case IFT_FDDI: {
2165 struct fddi_header *fh;
2166
2167 fh = mtod(m, struct fddi_header *);
2168 fh->fddi_shost[0] = 0;
2169 fh->fddi_shost[1] = 0;
2170 fh->fddi_shost[2] = 0x5e;
2171 fh->fddi_shost[3] = 0;
2172 fh->fddi_shost[4] = 1;
2173 fh->fddi_shost[5] = sc->sc_vhid;
2174 }
2175 break;
2176 case IFT_ISO88025: {
2177 struct iso88025_header *th;
2178 th = mtod(m, struct iso88025_header *);
2179 th->iso88025_shost[0] = 3;
2180 th->iso88025_shost[1] = 0;
2181 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1);
2182 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1);
2183 th->iso88025_shost[4] = 0;
2184 th->iso88025_shost[5] = 0;
2185 }
2186 break;
2187 default:
2188 printf("%s: carp is not supported for this interface type\n",
2189 ifp->if_xname);
2190 return (EOPNOTSUPP);
2191 }
2192
2193 return (0);
2194 }
2195
2196 static void
2197 carp_set_state(struct carp_softc *sc, int state)
2198 {
2199 int link_state;
2200
2201 if (sc->sc_carpdev)
2202 CARP_SCLOCK_ASSERT(sc);
2203
2204 if (sc->sc_state == state)
2205 return;
2206
2207 sc->sc_state = state;
2208 switch (state) {
2209 case BACKUP:
2210 link_state = LINK_STATE_DOWN;
2211 break;
2212 case MASTER:
2213 link_state = LINK_STATE_UP;
2214 break;
2215 default:
2216 link_state = LINK_STATE_UNKNOWN;
2217 break;
2218 }
2219 if_link_state_change(SC2IFP(sc), link_state);
2220 }
2221
2222 void
2223 carp_carpdev_state(struct ifnet *ifp)
2224 {
2225 struct carp_if *cif;
2226
2227 cif = ifp->if_carp;
2228 CARP_LOCK(cif);
2229 carp_carpdev_state_locked(cif);
2230 CARP_UNLOCK(cif);
2231 }
2232
2233 static void
2234 carp_carpdev_state_locked(struct carp_if *cif)
2235 {
2236 struct carp_softc *sc;
2237
2238 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
2239 carp_sc_state_locked(sc);
2240 }
2241
2242 static void
2243 carp_sc_state_locked(struct carp_softc *sc)
2244 {
2245 CARP_SCLOCK_ASSERT(sc);
2246
2247 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP ||
2248 !(sc->sc_carpdev->if_flags & IFF_UP)) {
2249 sc->sc_flags_backup = SC2IFP(sc)->if_flags;
2250 SC2IFP(sc)->if_flags &= ~IFF_UP;
2251 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
2252 callout_stop(&sc->sc_ad_tmo);
2253 callout_stop(&sc->sc_md_tmo);
2254 callout_stop(&sc->sc_md6_tmo);
2255 carp_set_state(sc, INIT);
2256 carp_setrun(sc, 0);
2257 if (!sc->sc_suppress) {
2258 carp_suppress_preempt++;
2259 if (carp_suppress_preempt == 1) {
2260 CARP_SCUNLOCK(sc);
2261 carp_send_ad_all();
2262 CARP_SCLOCK(sc);
2263 }
2264 }
2265 sc->sc_suppress = 1;
2266 } else {
2267 SC2IFP(sc)->if_flags |= sc->sc_flags_backup;
2268 carp_set_state(sc, INIT);
2269 carp_setrun(sc, 0);
2270 if (sc->sc_suppress)
2271 carp_suppress_preempt--;
2272 sc->sc_suppress = 0;
2273 }
2274
2275 return;
2276 }
2277
2278 #ifdef INET
2279 extern struct domain inetdomain;
2280 static struct protosw in_carp_protosw = {
2281 .pr_type = SOCK_RAW,
2282 .pr_domain = &inetdomain,
2283 .pr_protocol = IPPROTO_CARP,
2284 .pr_flags = PR_ATOMIC|PR_ADDR,
2285 .pr_input = carp_input,
2286 .pr_output = (pr_output_t *)rip_output,
2287 .pr_ctloutput = rip_ctloutput,
2288 .pr_usrreqs = &rip_usrreqs
2289 };
2290 #endif
2291
2292 #ifdef INET6
2293 extern struct domain inet6domain;
2294 static struct ip6protosw in6_carp_protosw = {
2295 .pr_type = SOCK_RAW,
2296 .pr_domain = &inet6domain,
2297 .pr_protocol = IPPROTO_CARP,
2298 .pr_flags = PR_ATOMIC|PR_ADDR,
2299 .pr_input = carp6_input,
2300 .pr_output = rip6_output,
2301 .pr_ctloutput = rip6_ctloutput,
2302 .pr_usrreqs = &rip6_usrreqs
2303 };
2304 #endif
2305
2306 static void
2307 carp_mod_cleanup(void)
2308 {
2309
2310 if (if_detach_event_tag == NULL)
2311 return;
2312 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag);
2313 if_clone_detach(&carp_cloner);
2314 #ifdef INET
2315 if (proto_reg[CARP_INET] == 0) {
2316 (void)ipproto_unregister(IPPROTO_CARP);
2317 pf_proto_unregister(PF_INET, IPPROTO_CARP, SOCK_RAW);
2318 proto_reg[CARP_INET] = -1;
2319 }
2320 carp_iamatch_p = NULL;
2321 #endif
2322 #ifdef INET6
2323 if (proto_reg[CARP_INET6] == 0) {
2324 (void)ip6proto_unregister(IPPROTO_CARP);
2325 pf_proto_unregister(PF_INET6, IPPROTO_CARP, SOCK_RAW);
2326 proto_reg[CARP_INET6] = -1;
2327 }
2328 carp_iamatch6_p = NULL;
2329 carp_macmatch6_p = NULL;
2330 #endif
2331 carp_linkstate_p = NULL;
2332 carp_forus_p = NULL;
2333 carp_output_p = NULL;
2334 mtx_destroy(&carp_mtx);
2335 }
2336
2337 static int
2338 carp_mod_load(void)
2339 {
2340 int err;
2341
2342 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
2343 carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY);
2344 if (if_detach_event_tag == NULL)
2345 return (ENOMEM);
2346 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF);
2347 LIST_INIT(&carpif_list);
2348 if_clone_attach(&carp_cloner);
2349 carp_linkstate_p = carp_carpdev_state;
2350 carp_forus_p = carp_forus;
2351 carp_output_p = carp_output;
2352 #ifdef INET6
2353 carp_iamatch6_p = carp_iamatch6;
2354 carp_macmatch6_p = carp_macmatch6;
2355 proto_reg[CARP_INET6] = pf_proto_register(PF_INET6,
2356 (struct protosw *)&in6_carp_protosw);
2357 if (proto_reg[CARP_INET6] != 0) {
2358 printf("carp: error %d attaching to PF_INET6\n",
2359 proto_reg[CARP_INET6]);
2360 carp_mod_cleanup();
2361 return (EINVAL);
2362 }
2363 err = ip6proto_register(IPPROTO_CARP);
2364 if (err) {
2365 printf("carp: error %d registering with INET6\n", err);
2366 carp_mod_cleanup();
2367 return (EINVAL);
2368 }
2369 #endif
2370 #ifdef INET
2371 carp_iamatch_p = carp_iamatch;
2372 proto_reg[CARP_INET] = pf_proto_register(PF_INET, &in_carp_protosw);
2373 if (proto_reg[CARP_INET] != 0) {
2374 printf("carp: error %d attaching to PF_INET\n",
2375 proto_reg[CARP_INET]);
2376 carp_mod_cleanup();
2377 return (EINVAL);
2378 }
2379 err = ipproto_register(IPPROTO_CARP);
2380 if (err) {
2381 printf("carp: error %d registering with INET\n", err);
2382 carp_mod_cleanup();
2383 return (EINVAL);
2384 }
2385 #endif
2386 return 0;
2387 }
2388
2389 static int
2390 carp_modevent(module_t mod, int type, void *data)
2391 {
2392 switch (type) {
2393 case MOD_LOAD:
2394 return carp_mod_load();
2395 /* NOTREACHED */
2396 case MOD_UNLOAD:
2397 /*
2398 * XXX: For now, disallow module unloading by default due to
2399 * a race condition where a thread may dereference one of the
2400 * function pointer hooks after the module has been
2401 * unloaded, during processing of a packet, causing a panic.
2402 */
2403 #ifdef CARPMOD_CAN_UNLOAD
2404 carp_mod_cleanup();
2405 #else
2406 return (EBUSY);
2407 #endif
2408 break;
2409
2410 default:
2411 return (EINVAL);
2412 }
2413
2414 return (0);
2415 }
2416
2417 static moduledata_t carp_mod = {
2418 "carp",
2419 carp_modevent,
2420 0
2421 };
2422
2423 DECLARE_MODULE(carp, carp_mod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
Cache object: 11261da26e6fb4a3c803ee61684b1f03
|