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/8.4/sys/netinet/ip_carp.c 237105 2012-06-14 21:40:14Z thompsa $");
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 *, int dofree);
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 *, int dofree);
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_RLOCK(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_RUNLOCK(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_RLOCK(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_RUNLOCK(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 case of destruction
470 * of the underlying interface, we do not cleanup our multicast
471 * memberships, since they are already freed. But we purge pointers
472 * to multicast structures, since they are no longer valid, to
473 * avoid panic in future calls to carpdetach(). Also, we do not
474 * release the lock on return, because the function will be
475 * called once more, for another CARP instance on the same
476 * interface.
477 */
478 static void
479 carpdetach(struct carp_softc *sc, int unlock)
480 {
481 struct carp_if *cif;
482
483 callout_stop(&sc->sc_ad_tmo);
484 callout_stop(&sc->sc_md_tmo);
485 callout_stop(&sc->sc_md6_tmo);
486
487 if (sc->sc_suppress)
488 carp_suppress_preempt--;
489 sc->sc_suppress = 0;
490
491 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
492 carp_suppress_preempt--;
493 sc->sc_sendad_errors = 0;
494
495 carp_set_state(sc, INIT);
496 SC2IFP(sc)->if_flags &= ~IFF_UP;
497 carp_setrun(sc, 0);
498 carp_multicast_cleanup(sc, unlock);
499 #ifdef INET6
500 carp_multicast6_cleanup(sc, unlock);
501 #endif
502
503 if (sc->sc_carpdev != NULL) {
504 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
505 CARP_LOCK_ASSERT(cif);
506 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
507 if (!--cif->vhif_nvrs) {
508 ifpromisc(sc->sc_carpdev, 0);
509 sc->sc_carpdev->if_carp = NULL;
510 CARP_LOCK_DESTROY(cif);
511 free(cif, M_CARP);
512 } else if (unlock)
513 CARP_UNLOCK(cif);
514 sc->sc_carpdev = NULL;
515 }
516 }
517
518 /* Detach an interface from the carp. */
519 static void
520 carp_ifdetach(void *arg __unused, struct ifnet *ifp)
521 {
522 struct carp_if *cif = (struct carp_if *)ifp->if_carp;
523 struct carp_softc *sc, *nextsc;
524
525 if (cif == NULL)
526 return;
527
528 /*
529 * XXX: At the end of for() cycle the lock will be destroyed.
530 */
531 CARP_LOCK(cif);
532 for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) {
533 nextsc = TAILQ_NEXT(sc, sc_list);
534 carpdetach(sc, 0);
535 }
536 }
537
538 /*
539 * process input packet.
540 * we have rearranged checks order compared to the rfc,
541 * but it seems more efficient this way or not possible otherwise.
542 */
543 void
544 carp_input(struct mbuf *m, int hlen)
545 {
546 struct ip *ip = mtod(m, struct ip *);
547 struct carp_header *ch;
548 int iplen, len;
549
550 CARPSTATS_INC(carps_ipackets);
551
552 if (!carp_opts[CARPCTL_ALLOW]) {
553 m_freem(m);
554 return;
555 }
556
557 /* check if received on a valid carp interface */
558 if (m->m_pkthdr.rcvif->if_carp == NULL) {
559 CARPSTATS_INC(carps_badif);
560 CARP_DEBUG("carp_input: packet received on non-carp "
561 "interface: %s\n",
562 m->m_pkthdr.rcvif->if_xname);
563 m_freem(m);
564 return;
565 }
566
567 /* verify that the IP TTL is 255. */
568 if (ip->ip_ttl != CARP_DFLTTL) {
569 CARPSTATS_INC(carps_badttl);
570 CARP_DEBUG("carp_input: received ttl %d != 255 on %s\n",
571 ip->ip_ttl,
572 m->m_pkthdr.rcvif->if_xname);
573 m_freem(m);
574 return;
575 }
576
577 iplen = ip->ip_hl << 2;
578
579 if (m->m_pkthdr.len < iplen + sizeof(*ch)) {
580 CARPSTATS_INC(carps_badlen);
581 CARP_DEBUG("carp_input: received len %zd < "
582 "sizeof(struct carp_header) on %s\n",
583 m->m_len - sizeof(struct ip),
584 m->m_pkthdr.rcvif->if_xname);
585 m_freem(m);
586 return;
587 }
588
589 if (iplen + sizeof(*ch) < m->m_len) {
590 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) {
591 CARPSTATS_INC(carps_hdrops);
592 CARP_DEBUG("carp_input: pullup failed\n");
593 return;
594 }
595 ip = mtod(m, struct ip *);
596 }
597 ch = (struct carp_header *)((char *)ip + iplen);
598
599 /*
600 * verify that the received packet length is
601 * equal to the CARP header
602 */
603 len = iplen + sizeof(*ch);
604 if (len > m->m_pkthdr.len) {
605 CARPSTATS_INC(carps_badlen);
606 CARP_DEBUG("carp_input: packet too short %d on %s\n",
607 m->m_pkthdr.len,
608 m->m_pkthdr.rcvif->if_xname);
609 m_freem(m);
610 return;
611 }
612
613 if ((m = m_pullup(m, len)) == NULL) {
614 CARPSTATS_INC(carps_hdrops);
615 return;
616 }
617 ip = mtod(m, struct ip *);
618 ch = (struct carp_header *)((char *)ip + iplen);
619
620 /* verify the CARP checksum */
621 m->m_data += iplen;
622 if (carp_cksum(m, len - iplen)) {
623 CARPSTATS_INC(carps_badsum);
624 CARP_DEBUG("carp_input: checksum failed on %s\n",
625 m->m_pkthdr.rcvif->if_xname);
626 m_freem(m);
627 return;
628 }
629 m->m_data -= iplen;
630
631 carp_input_c(m, ch, AF_INET);
632 }
633
634 #ifdef INET6
635 int
636 carp6_input(struct mbuf **mp, int *offp, int proto)
637 {
638 struct mbuf *m = *mp;
639 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
640 struct carp_header *ch;
641 u_int len;
642
643 CARPSTATS_INC(carps_ipackets6);
644
645 if (!carp_opts[CARPCTL_ALLOW]) {
646 m_freem(m);
647 return (IPPROTO_DONE);
648 }
649
650 /* check if received on a valid carp interface */
651 if (m->m_pkthdr.rcvif->if_carp == NULL) {
652 CARPSTATS_INC(carps_badif);
653 CARP_DEBUG("carp6_input: packet received on non-carp "
654 "interface: %s\n",
655 m->m_pkthdr.rcvif->if_xname);
656 m_freem(m);
657 return (IPPROTO_DONE);
658 }
659
660 /* verify that the IP TTL is 255 */
661 if (ip6->ip6_hlim != CARP_DFLTTL) {
662 CARPSTATS_INC(carps_badttl);
663 CARP_DEBUG("carp6_input: received ttl %d != 255 on %s\n",
664 ip6->ip6_hlim,
665 m->m_pkthdr.rcvif->if_xname);
666 m_freem(m);
667 return (IPPROTO_DONE);
668 }
669
670 /* verify that we have a complete carp packet */
671 len = m->m_len;
672 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
673 if (ch == NULL) {
674 CARPSTATS_INC(carps_badlen);
675 CARP_DEBUG("carp6_input: packet size %u too small\n", len);
676 return (IPPROTO_DONE);
677 }
678
679
680 /* verify the CARP checksum */
681 m->m_data += *offp;
682 if (carp_cksum(m, sizeof(*ch))) {
683 CARPSTATS_INC(carps_badsum);
684 CARP_DEBUG("carp6_input: checksum failed, on %s\n",
685 m->m_pkthdr.rcvif->if_xname);
686 m_freem(m);
687 return (IPPROTO_DONE);
688 }
689 m->m_data -= *offp;
690
691 carp_input_c(m, ch, AF_INET6);
692 return (IPPROTO_DONE);
693 }
694 #endif /* INET6 */
695
696 static void
697 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af)
698 {
699 struct ifnet *ifp = m->m_pkthdr.rcvif;
700 struct carp_softc *sc;
701 u_int64_t tmp_counter;
702 struct timeval sc_tv, ch_tv;
703
704 /* verify that the VHID is valid on the receiving interface */
705 CARP_LOCK(ifp->if_carp);
706 TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list)
707 if (sc->sc_vhid == ch->carp_vhid)
708 break;
709
710 if (!sc || !((SC2IFP(sc)->if_flags & IFF_UP) &&
711 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) {
712 CARPSTATS_INC(carps_badvhid);
713 CARP_UNLOCK(ifp->if_carp);
714 m_freem(m);
715 return;
716 }
717
718 getmicrotime(&SC2IFP(sc)->if_lastchange);
719 SC2IFP(sc)->if_ipackets++;
720 SC2IFP(sc)->if_ibytes += m->m_pkthdr.len;
721
722 if (bpf_peers_present(SC2IFP(sc)->if_bpf)) {
723 struct ip *ip = mtod(m, struct ip *);
724 uint32_t af1 = af;
725
726 /* BPF wants net byte order */
727 ip->ip_len = htons(ip->ip_len + (ip->ip_hl << 2));
728 ip->ip_off = htons(ip->ip_off);
729 bpf_mtap2(SC2IFP(sc)->if_bpf, &af1, sizeof(af1), m);
730 }
731
732 /* verify the CARP version. */
733 if (ch->carp_version != CARP_VERSION) {
734 CARPSTATS_INC(carps_badver);
735 SC2IFP(sc)->if_ierrors++;
736 CARP_UNLOCK(ifp->if_carp);
737 CARP_DEBUG("%s; invalid version %d\n",
738 SC2IFP(sc)->if_xname,
739 ch->carp_version);
740 m_freem(m);
741 return;
742 }
743
744 /* verify the hash */
745 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
746 CARPSTATS_INC(carps_badauth);
747 SC2IFP(sc)->if_ierrors++;
748 CARP_UNLOCK(ifp->if_carp);
749 CARP_DEBUG("%s: incorrect hash\n", SC2IFP(sc)->if_xname);
750 m_freem(m);
751 return;
752 }
753
754 tmp_counter = ntohl(ch->carp_counter[0]);
755 tmp_counter = tmp_counter<<32;
756 tmp_counter += ntohl(ch->carp_counter[1]);
757
758 /* XXX Replay protection goes here */
759
760 sc->sc_init_counter = 0;
761 sc->sc_counter = tmp_counter;
762
763 sc_tv.tv_sec = sc->sc_advbase;
764 if (carp_suppress_preempt && sc->sc_advskew < 240)
765 sc_tv.tv_usec = 240 * 1000000 / 256;
766 else
767 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256;
768 ch_tv.tv_sec = ch->carp_advbase;
769 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
770
771 switch (sc->sc_state) {
772 case INIT:
773 break;
774 case MASTER:
775 /*
776 * If we receive an advertisement from a master who's going to
777 * be more frequent than us, go into BACKUP state.
778 */
779 if (timevalcmp(&sc_tv, &ch_tv, >) ||
780 timevalcmp(&sc_tv, &ch_tv, ==)) {
781 callout_stop(&sc->sc_ad_tmo);
782 CARP_LOG("%s: MASTER -> BACKUP "
783 "(more frequent advertisement received)\n",
784 SC2IFP(sc)->if_xname);
785 carp_set_state(sc, BACKUP);
786 carp_setrun(sc, 0);
787 carp_setroute(sc, RTM_DELETE);
788 }
789 break;
790 case BACKUP:
791 /*
792 * If we're pre-empting masters who advertise slower than us,
793 * and this one claims to be slower, treat him as down.
794 */
795 if (carp_opts[CARPCTL_PREEMPT] &&
796 timevalcmp(&sc_tv, &ch_tv, <)) {
797 CARP_LOG("%s: BACKUP -> MASTER "
798 "(preempting a slower master)\n",
799 SC2IFP(sc)->if_xname);
800 carp_master_down_locked(sc);
801 break;
802 }
803
804 /*
805 * If the master is going to advertise at such a low frequency
806 * that he's guaranteed to time out, we'd might as well just
807 * treat him as timed out now.
808 */
809 sc_tv.tv_sec = sc->sc_advbase * 3;
810 if (timevalcmp(&sc_tv, &ch_tv, <)) {
811 CARP_LOG("%s: BACKUP -> MASTER "
812 "(master timed out)\n",
813 SC2IFP(sc)->if_xname);
814 carp_master_down_locked(sc);
815 break;
816 }
817
818 /*
819 * Otherwise, we reset the counter and wait for the next
820 * advertisement.
821 */
822 carp_setrun(sc, af);
823 break;
824 }
825
826 CARP_UNLOCK(ifp->if_carp);
827
828 m_freem(m);
829 return;
830 }
831
832 static int
833 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch)
834 {
835 struct m_tag *mtag;
836 struct ifnet *ifp = SC2IFP(sc);
837
838 if (sc->sc_init_counter) {
839 /* this could also be seconds since unix epoch */
840 sc->sc_counter = arc4random();
841 sc->sc_counter = sc->sc_counter << 32;
842 sc->sc_counter += arc4random();
843 } else
844 sc->sc_counter++;
845
846 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff);
847 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff);
848
849 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
850
851 /* Tag packet for carp_output */
852 mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct ifnet *), M_NOWAIT);
853 if (mtag == NULL) {
854 m_freem(m);
855 SC2IFP(sc)->if_oerrors++;
856 return (ENOMEM);
857 }
858 bcopy(&ifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *));
859 m_tag_prepend(m, mtag);
860
861 return (0);
862 }
863
864 static void
865 carp_send_ad_all(void)
866 {
867 struct carp_softc *sc;
868
869 mtx_lock(&carp_mtx);
870 LIST_FOREACH(sc, &carpif_list, sc_next) {
871 if (sc->sc_carpdev == NULL)
872 continue;
873 CARP_SCLOCK(sc);
874 if ((SC2IFP(sc)->if_flags & IFF_UP) &&
875 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING) &&
876 sc->sc_state == MASTER)
877 carp_send_ad_locked(sc);
878 CARP_SCUNLOCK(sc);
879 }
880 mtx_unlock(&carp_mtx);
881 }
882
883 static void
884 carp_send_ad(void *v)
885 {
886 struct carp_softc *sc = v;
887
888 CARP_SCLOCK(sc);
889 carp_send_ad_locked(sc);
890 CARP_SCUNLOCK(sc);
891 }
892
893 static void
894 carp_send_ad_locked(struct carp_softc *sc)
895 {
896 struct carp_header ch;
897 struct timeval tv;
898 struct carp_header *ch_ptr;
899 struct mbuf *m;
900 int len, advbase, advskew;
901
902 CARP_SCLOCK_ASSERT(sc);
903
904 /* bow out if we've lost our UPness or RUNNINGuiness */
905 if (!((SC2IFP(sc)->if_flags & IFF_UP) &&
906 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) {
907 advbase = 255;
908 advskew = 255;
909 } else {
910 advbase = sc->sc_advbase;
911 if (!carp_suppress_preempt || sc->sc_advskew > 240)
912 advskew = sc->sc_advskew;
913 else
914 advskew = 240;
915 tv.tv_sec = advbase;
916 tv.tv_usec = advskew * 1000000 / 256;
917 }
918
919 ch.carp_version = CARP_VERSION;
920 ch.carp_type = CARP_ADVERTISEMENT;
921 ch.carp_vhid = sc->sc_vhid;
922 ch.carp_advbase = advbase;
923 ch.carp_advskew = advskew;
924 ch.carp_authlen = 7; /* XXX DEFINE */
925 ch.carp_pad1 = 0; /* must be zero */
926 ch.carp_cksum = 0;
927
928 #ifdef INET
929 if (sc->sc_ia) {
930 struct ip *ip;
931
932 MGETHDR(m, M_DONTWAIT, MT_HEADER);
933 if (m == NULL) {
934 SC2IFP(sc)->if_oerrors++;
935 CARPSTATS_INC(carps_onomem);
936 /* XXX maybe less ? */
937 if (advbase != 255 || advskew != 255)
938 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
939 carp_send_ad, sc);
940 return;
941 }
942 len = sizeof(*ip) + sizeof(ch);
943 m->m_pkthdr.len = len;
944 m->m_pkthdr.rcvif = NULL;
945 m->m_len = len;
946 MH_ALIGN(m, m->m_len);
947 m->m_flags |= M_MCAST;
948 ip = mtod(m, struct ip *);
949 ip->ip_v = IPVERSION;
950 ip->ip_hl = sizeof(*ip) >> 2;
951 ip->ip_tos = IPTOS_LOWDELAY;
952 ip->ip_len = len;
953 ip->ip_id = ip_newid();
954 ip->ip_off = IP_DF;
955 ip->ip_ttl = CARP_DFLTTL;
956 ip->ip_p = IPPROTO_CARP;
957 ip->ip_sum = 0;
958 ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr;
959 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
960
961 ch_ptr = (struct carp_header *)(&ip[1]);
962 bcopy(&ch, ch_ptr, sizeof(ch));
963 if (carp_prepare_ad(m, sc, ch_ptr))
964 return;
965
966 m->m_data += sizeof(*ip);
967 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip));
968 m->m_data -= sizeof(*ip);
969
970 getmicrotime(&SC2IFP(sc)->if_lastchange);
971 SC2IFP(sc)->if_opackets++;
972 SC2IFP(sc)->if_obytes += len;
973 CARPSTATS_INC(carps_opackets);
974
975 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) {
976 SC2IFP(sc)->if_oerrors++;
977 if (sc->sc_sendad_errors < INT_MAX)
978 sc->sc_sendad_errors++;
979 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
980 carp_suppress_preempt++;
981 if (carp_suppress_preempt == 1) {
982 CARP_SCUNLOCK(sc);
983 carp_send_ad_all();
984 CARP_SCLOCK(sc);
985 }
986 }
987 sc->sc_sendad_success = 0;
988 } else {
989 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
990 if (++sc->sc_sendad_success >=
991 CARP_SENDAD_MIN_SUCCESS) {
992 carp_suppress_preempt--;
993 sc->sc_sendad_errors = 0;
994 }
995 } else
996 sc->sc_sendad_errors = 0;
997 }
998 }
999 #endif /* INET */
1000 #ifdef INET6
1001 if (sc->sc_ia6) {
1002 struct ip6_hdr *ip6;
1003
1004 MGETHDR(m, M_DONTWAIT, MT_HEADER);
1005 if (m == NULL) {
1006 SC2IFP(sc)->if_oerrors++;
1007 CARPSTATS_INC(carps_onomem);
1008 /* XXX maybe less ? */
1009 if (advbase != 255 || advskew != 255)
1010 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1011 carp_send_ad, sc);
1012 return;
1013 }
1014 len = sizeof(*ip6) + sizeof(ch);
1015 m->m_pkthdr.len = len;
1016 m->m_pkthdr.rcvif = NULL;
1017 m->m_len = len;
1018 MH_ALIGN(m, m->m_len);
1019 m->m_flags |= M_MCAST;
1020 ip6 = mtod(m, struct ip6_hdr *);
1021 bzero(ip6, sizeof(*ip6));
1022 ip6->ip6_vfc |= IPV6_VERSION;
1023 ip6->ip6_hlim = CARP_DFLTTL;
1024 ip6->ip6_nxt = IPPROTO_CARP;
1025 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src,
1026 sizeof(struct in6_addr));
1027 /* set the multicast destination */
1028
1029 ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
1030 ip6->ip6_dst.s6_addr8[15] = 0x12;
1031 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
1032 SC2IFP(sc)->if_oerrors++;
1033 m_freem(m);
1034 CARP_DEBUG("%s: in6_setscope failed\n", __func__);
1035 return;
1036 }
1037
1038 ch_ptr = (struct carp_header *)(&ip6[1]);
1039 bcopy(&ch, ch_ptr, sizeof(ch));
1040 if (carp_prepare_ad(m, sc, ch_ptr))
1041 return;
1042
1043 m->m_data += sizeof(*ip6);
1044 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6));
1045 m->m_data -= sizeof(*ip6);
1046
1047 getmicrotime(&SC2IFP(sc)->if_lastchange);
1048 SC2IFP(sc)->if_opackets++;
1049 SC2IFP(sc)->if_obytes += len;
1050 CARPSTATS_INC(carps_opackets6);
1051
1052 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) {
1053 SC2IFP(sc)->if_oerrors++;
1054 if (sc->sc_sendad_errors < INT_MAX)
1055 sc->sc_sendad_errors++;
1056 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1057 carp_suppress_preempt++;
1058 if (carp_suppress_preempt == 1) {
1059 CARP_SCUNLOCK(sc);
1060 carp_send_ad_all();
1061 CARP_SCLOCK(sc);
1062 }
1063 }
1064 sc->sc_sendad_success = 0;
1065 } else {
1066 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1067 if (++sc->sc_sendad_success >=
1068 CARP_SENDAD_MIN_SUCCESS) {
1069 carp_suppress_preempt--;
1070 sc->sc_sendad_errors = 0;
1071 }
1072 } else
1073 sc->sc_sendad_errors = 0;
1074 }
1075 }
1076 #endif /* INET6 */
1077
1078 if (advbase != 255 || advskew != 255)
1079 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1080 carp_send_ad, sc);
1081
1082 }
1083
1084 /*
1085 * Broadcast a gratuitous ARP request containing
1086 * the virtual router MAC address for each IP address
1087 * associated with the virtual router.
1088 */
1089 static void
1090 carp_send_arp(struct carp_softc *sc)
1091 {
1092 struct ifaddr *ifa;
1093
1094 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1095
1096 if (ifa->ifa_addr->sa_family != AF_INET)
1097 continue;
1098
1099 /* arprequest(sc->sc_carpdev, &in, &in, IF_LLADDR(sc->sc_ifp)); */
1100 arp_ifinit2(sc->sc_carpdev, ifa, IF_LLADDR(sc->sc_ifp));
1101
1102 DELAY(1000); /* XXX */
1103 }
1104 }
1105
1106 #ifdef INET6
1107 static void
1108 carp_send_na(struct carp_softc *sc)
1109 {
1110 struct ifaddr *ifa;
1111 struct in6_addr *in6;
1112 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1113
1114 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1115
1116 if (ifa->ifa_addr->sa_family != AF_INET6)
1117 continue;
1118
1119 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
1120 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1121 ND_NA_FLAG_OVERRIDE, 1, NULL);
1122 DELAY(1000); /* XXX */
1123 }
1124 }
1125 #endif /* INET6 */
1126
1127 static int
1128 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type)
1129 {
1130 struct carp_softc *vh;
1131 struct ifaddr *ifa;
1132 int count = 0;
1133
1134 CARP_LOCK_ASSERT(cif);
1135
1136 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1137 if ((type == CARP_COUNT_RUNNING &&
1138 (SC2IFP(vh)->if_flags & IFF_UP) &&
1139 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) ||
1140 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) {
1141 IF_ADDR_RLOCK(SC2IFP(vh));
1142 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist,
1143 ifa_list) {
1144 if (ifa->ifa_addr->sa_family == AF_INET &&
1145 ia->ia_addr.sin_addr.s_addr ==
1146 ifatoia(ifa)->ia_addr.sin_addr.s_addr)
1147 count++;
1148 }
1149 IF_ADDR_RUNLOCK(SC2IFP(vh));
1150 }
1151 }
1152 return (count);
1153 }
1154
1155 int
1156 carp_iamatch(struct ifnet *ifp, struct in_ifaddr *ia,
1157 struct in_addr *isaddr, u_int8_t **enaddr)
1158 {
1159 struct carp_if *cif;
1160 struct carp_softc *vh;
1161 int index, count = 0;
1162 struct ifaddr *ifa;
1163
1164 cif = ifp->if_carp;
1165 CARP_LOCK(cif);
1166
1167 if (carp_opts[CARPCTL_ARPBALANCE]) {
1168 /*
1169 * XXX proof of concept implementation.
1170 * We use the source ip to decide which virtual host should
1171 * handle the request. If we're master of that virtual host,
1172 * then we respond, otherwise, just drop the arp packet on
1173 * the floor.
1174 */
1175 count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING);
1176 if (count == 0) {
1177 /* should never reach this */
1178 CARP_UNLOCK(cif);
1179 return (0);
1180 }
1181
1182 /* this should be a hash, like pf_hash() */
1183 index = ntohl(isaddr->s_addr) % count;
1184 count = 0;
1185
1186 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1187 if ((SC2IFP(vh)->if_flags & IFF_UP) &&
1188 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) {
1189 IF_ADDR_RLOCK(SC2IFP(vh));
1190 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist,
1191 ifa_list) {
1192 if (ifa->ifa_addr->sa_family ==
1193 AF_INET &&
1194 ia->ia_addr.sin_addr.s_addr ==
1195 ifatoia(ifa)->ia_addr.sin_addr.s_addr) {
1196 if (count == index) {
1197 if (vh->sc_state ==
1198 MASTER) {
1199 *enaddr = IF_LLADDR(vh->sc_ifp);
1200 IF_ADDR_RUNLOCK(SC2IFP(vh));
1201 CARP_UNLOCK(cif);
1202 return (1);
1203 } else {
1204 IF_ADDR_RUNLOCK(SC2IFP(vh));
1205 CARP_UNLOCK(cif);
1206 return (0);
1207 }
1208 }
1209 count++;
1210 }
1211 }
1212 IF_ADDR_RUNLOCK(SC2IFP(vh));
1213 }
1214 }
1215 } else {
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 ia->ia_ifp == SC2IFP(vh) &&
1220 vh->sc_state == MASTER) {
1221 *enaddr = IF_LLADDR(vh->sc_ifp);
1222 CARP_UNLOCK(cif);
1223 return (1);
1224 }
1225 }
1226 }
1227 CARP_UNLOCK(cif);
1228 return (0);
1229 }
1230
1231 #ifdef INET6
1232 struct ifaddr *
1233 carp_iamatch6(struct ifnet *ifp, struct in6_addr *taddr)
1234 {
1235 struct carp_if *cif;
1236 struct carp_softc *vh;
1237 struct ifaddr *ifa;
1238
1239 cif = ifp->if_carp;
1240 CARP_LOCK(cif);
1241 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1242 IF_ADDR_RLOCK(SC2IFP(vh));
1243 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, ifa_list) {
1244 if (IN6_ARE_ADDR_EQUAL(taddr,
1245 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1246 (SC2IFP(vh)->if_flags & IFF_UP) &&
1247 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
1248 vh->sc_state == MASTER) {
1249 ifa_ref(ifa);
1250 IF_ADDR_RUNLOCK(SC2IFP(vh));
1251 CARP_UNLOCK(cif);
1252 return (ifa);
1253 }
1254 }
1255 IF_ADDR_RUNLOCK(SC2IFP(vh));
1256 }
1257 CARP_UNLOCK(cif);
1258
1259 return (NULL);
1260 }
1261
1262 caddr_t
1263 carp_macmatch6(struct ifnet *ifp, struct mbuf *m, const struct in6_addr *taddr)
1264 {
1265 struct m_tag *mtag;
1266 struct carp_if *cif;
1267 struct carp_softc *sc;
1268 struct ifaddr *ifa;
1269
1270 cif = ifp->if_carp;
1271 CARP_LOCK(cif);
1272 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
1273 IF_ADDR_RLOCK(SC2IFP(sc));
1274 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1275 if (IN6_ARE_ADDR_EQUAL(taddr,
1276 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1277 (SC2IFP(sc)->if_flags & IFF_UP) &&
1278 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING)) {
1279 struct ifnet *ifp = SC2IFP(sc);
1280 mtag = m_tag_get(PACKET_TAG_CARP,
1281 sizeof(struct ifnet *), M_NOWAIT);
1282 if (mtag == NULL) {
1283 /* better a bit than nothing */
1284 IF_ADDR_RUNLOCK(SC2IFP(sc));
1285 CARP_UNLOCK(cif);
1286 return (IF_LLADDR(sc->sc_ifp));
1287 }
1288 bcopy(&ifp, (caddr_t)(mtag + 1),
1289 sizeof(struct ifnet *));
1290 m_tag_prepend(m, mtag);
1291
1292 IF_ADDR_RUNLOCK(SC2IFP(sc));
1293 CARP_UNLOCK(cif);
1294 return (IF_LLADDR(sc->sc_ifp));
1295 }
1296 }
1297 IF_ADDR_RUNLOCK(SC2IFP(sc));
1298 }
1299 CARP_UNLOCK(cif);
1300
1301 return (NULL);
1302 }
1303 #endif
1304
1305 struct ifnet *
1306 carp_forus(struct ifnet *ifp, u_char *dhost)
1307 {
1308 struct carp_if *cif;
1309 struct carp_softc *vh;
1310 u_int8_t *ena = dhost;
1311
1312 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
1313 return (NULL);
1314
1315 cif = ifp->if_carp;
1316 CARP_LOCK(cif);
1317 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list)
1318 if ((SC2IFP(vh)->if_flags & IFF_UP) &&
1319 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
1320 vh->sc_state == MASTER &&
1321 !bcmp(dhost, IF_LLADDR(vh->sc_ifp), ETHER_ADDR_LEN)) {
1322 CARP_UNLOCK(cif);
1323 return (SC2IFP(vh));
1324 }
1325
1326 CARP_UNLOCK(cif);
1327 return (NULL);
1328 }
1329
1330 static void
1331 carp_master_down(void *v)
1332 {
1333 struct carp_softc *sc = v;
1334
1335 CARP_SCLOCK(sc);
1336 carp_master_down_locked(sc);
1337 CARP_SCUNLOCK(sc);
1338 }
1339
1340 static void
1341 carp_master_down_locked(struct carp_softc *sc)
1342 {
1343 if (sc->sc_carpdev)
1344 CARP_SCLOCK_ASSERT(sc);
1345
1346 switch (sc->sc_state) {
1347 case INIT:
1348 printf("%s: master_down event in INIT state\n",
1349 SC2IFP(sc)->if_xname);
1350 break;
1351 case MASTER:
1352 break;
1353 case BACKUP:
1354 carp_set_state(sc, MASTER);
1355 carp_send_ad_locked(sc);
1356 carp_send_arp(sc);
1357 #ifdef INET6
1358 carp_send_na(sc);
1359 #endif /* INET6 */
1360 carp_setrun(sc, 0);
1361 carp_setroute(sc, RTM_ADD);
1362 break;
1363 }
1364 }
1365
1366 /*
1367 * When in backup state, af indicates whether to reset the master down timer
1368 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1369 */
1370 static void
1371 carp_setrun(struct carp_softc *sc, sa_family_t af)
1372 {
1373 struct timeval tv;
1374
1375 if (sc->sc_carpdev == NULL) {
1376 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1377 carp_set_state(sc, INIT);
1378 return;
1379 } else
1380 CARP_SCLOCK_ASSERT(sc);
1381
1382 if (SC2IFP(sc)->if_flags & IFF_UP &&
1383 sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6) &&
1384 sc->sc_carpdev->if_link_state == LINK_STATE_UP)
1385 SC2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING;
1386 else {
1387 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1388 carp_setroute(sc, RTM_DELETE);
1389 return;
1390 }
1391
1392 switch (sc->sc_state) {
1393 case INIT:
1394 CARP_LOG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname);
1395 carp_set_state(sc, BACKUP);
1396 carp_setroute(sc, RTM_DELETE);
1397 carp_setrun(sc, 0);
1398 break;
1399 case BACKUP:
1400 callout_stop(&sc->sc_ad_tmo);
1401 tv.tv_sec = 3 * sc->sc_advbase;
1402 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1403 switch (af) {
1404 #ifdef INET
1405 case AF_INET:
1406 callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
1407 carp_master_down, sc);
1408 break;
1409 #endif /* INET */
1410 #ifdef INET6
1411 case AF_INET6:
1412 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
1413 carp_master_down, sc);
1414 break;
1415 #endif /* INET6 */
1416 default:
1417 if (sc->sc_naddrs)
1418 callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
1419 carp_master_down, sc);
1420 if (sc->sc_naddrs6)
1421 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
1422 carp_master_down, sc);
1423 break;
1424 }
1425 break;
1426 case MASTER:
1427 tv.tv_sec = sc->sc_advbase;
1428 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1429 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1430 carp_send_ad, sc);
1431 break;
1432 }
1433 }
1434
1435 static void
1436 carp_multicast_cleanup(struct carp_softc *sc, int dofree)
1437 {
1438 struct ip_moptions *imo = &sc->sc_imo;
1439 u_int16_t n = imo->imo_num_memberships;
1440
1441 /* Clean up our own multicast memberships */
1442 while (n-- > 0) {
1443 if (imo->imo_membership[n] != NULL) {
1444 if (dofree)
1445 in_delmulti(imo->imo_membership[n]);
1446 imo->imo_membership[n] = NULL;
1447 }
1448 }
1449 KASSERT(imo->imo_mfilters == NULL,
1450 ("%s: imo_mfilters != NULL", __func__));
1451 imo->imo_num_memberships = 0;
1452 imo->imo_multicast_ifp = NULL;
1453 }
1454
1455 #ifdef INET6
1456 static void
1457 carp_multicast6_cleanup(struct carp_softc *sc, int dofree)
1458 {
1459 struct ip6_moptions *im6o = &sc->sc_im6o;
1460 u_int16_t n = im6o->im6o_num_memberships;
1461
1462 while (n-- > 0) {
1463 if (im6o->im6o_membership[n] != NULL) {
1464 if (dofree)
1465 in6_mc_leave(im6o->im6o_membership[n], NULL);
1466 im6o->im6o_membership[n] = NULL;
1467 }
1468 }
1469 KASSERT(im6o->im6o_mfilters == NULL,
1470 ("%s: im6o_mfilters != NULL", __func__));
1471 im6o->im6o_num_memberships = 0;
1472 im6o->im6o_multicast_ifp = NULL;
1473 }
1474 #endif
1475
1476 static int
1477 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1478 {
1479 struct ifnet *ifp;
1480 struct carp_if *cif;
1481 struct in_ifaddr *ia, *ia_if;
1482 struct ip_moptions *imo = &sc->sc_imo;
1483 struct in_addr addr;
1484 u_long iaddr = htonl(sin->sin_addr.s_addr);
1485 int own, error;
1486
1487 if (sin->sin_addr.s_addr == 0) {
1488 if (!(SC2IFP(sc)->if_flags & IFF_UP))
1489 carp_set_state(sc, INIT);
1490 if (sc->sc_naddrs)
1491 SC2IFP(sc)->if_flags |= IFF_UP;
1492 if (sc->sc_carpdev)
1493 CARP_SCLOCK(sc);
1494 carp_setrun(sc, 0);
1495 if (sc->sc_carpdev)
1496 CARP_SCUNLOCK(sc);
1497 return (0);
1498 }
1499
1500 /* we have to do it by hands to check we won't match on us */
1501 ia_if = NULL; own = 0;
1502 IN_IFADDR_RLOCK();
1503 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1504 /* and, yeah, we need a multicast-capable iface too */
1505 if (ia->ia_ifp != SC2IFP(sc) &&
1506 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1507 (iaddr & ia->ia_subnetmask) == ia->ia_subnet) {
1508 if (!ia_if)
1509 ia_if = ia;
1510 if (sin->sin_addr.s_addr ==
1511 ia->ia_addr.sin_addr.s_addr)
1512 own++;
1513 }
1514 }
1515
1516 if (!ia_if) {
1517 IN_IFADDR_RUNLOCK();
1518 return (EADDRNOTAVAIL);
1519 }
1520
1521 ia = ia_if;
1522 ifa_ref(&ia->ia_ifa);
1523 IN_IFADDR_RUNLOCK();
1524
1525 ifp = ia->ia_ifp;
1526
1527 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1528 (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp)) {
1529 ifa_free(&ia->ia_ifa);
1530 return (EADDRNOTAVAIL);
1531 }
1532
1533 if (imo->imo_num_memberships == 0) {
1534 addr.s_addr = htonl(INADDR_CARP_GROUP);
1535 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) ==
1536 NULL) {
1537 ifa_free(&ia->ia_ifa);
1538 return (ENOBUFS);
1539 }
1540 imo->imo_num_memberships++;
1541 imo->imo_multicast_ifp = ifp;
1542 imo->imo_multicast_ttl = CARP_DFLTTL;
1543 imo->imo_multicast_loop = 0;
1544 }
1545
1546 if (!ifp->if_carp) {
1547
1548 cif = malloc(sizeof(*cif), M_CARP,
1549 M_WAITOK|M_ZERO);
1550 if (!cif) {
1551 error = ENOBUFS;
1552 goto cleanup;
1553 }
1554 if ((error = ifpromisc(ifp, 1))) {
1555 free(cif, M_CARP);
1556 goto cleanup;
1557 }
1558
1559 CARP_LOCK_INIT(cif);
1560 CARP_LOCK(cif);
1561 cif->vhif_ifp = ifp;
1562 TAILQ_INIT(&cif->vhif_vrs);
1563 ifp->if_carp = cif;
1564
1565 } else {
1566 struct carp_softc *vr;
1567
1568 cif = (struct carp_if *)ifp->if_carp;
1569 CARP_LOCK(cif);
1570 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1571 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1572 CARP_UNLOCK(cif);
1573 error = EEXIST;
1574 goto cleanup;
1575 }
1576 }
1577 sc->sc_ia = ia;
1578 sc->sc_carpdev = ifp;
1579
1580 { /* XXX prevent endless loop if already in queue */
1581 struct carp_softc *vr, *after = NULL;
1582 int myself = 0;
1583 cif = (struct carp_if *)ifp->if_carp;
1584
1585 /* XXX: cif should not change, right? So we still hold the lock */
1586 CARP_LOCK_ASSERT(cif);
1587
1588 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1589 if (vr == sc)
1590 myself = 1;
1591 if (vr->sc_vhid < sc->sc_vhid)
1592 after = vr;
1593 }
1594
1595 if (!myself) {
1596 /* We're trying to keep things in order */
1597 if (after == NULL) {
1598 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1599 } else {
1600 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1601 }
1602 cif->vhif_nvrs++;
1603 }
1604 }
1605
1606 sc->sc_naddrs++;
1607 SC2IFP(sc)->if_flags |= IFF_UP;
1608 if (own)
1609 sc->sc_advskew = 0;
1610 carp_sc_state_locked(sc);
1611 carp_setrun(sc, 0);
1612
1613 CARP_UNLOCK(cif);
1614 ifa_free(&ia->ia_ifa); /* XXXRW: should hold reference for softc. */
1615
1616 return (0);
1617
1618 cleanup:
1619 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1620 ifa_free(&ia->ia_ifa);
1621 return (error);
1622 }
1623
1624 static int
1625 carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1626 {
1627 int error = 0;
1628
1629 if (!--sc->sc_naddrs) {
1630 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1631 struct ip_moptions *imo = &sc->sc_imo;
1632
1633 CARP_LOCK(cif);
1634 callout_stop(&sc->sc_ad_tmo);
1635 SC2IFP(sc)->if_flags &= ~IFF_UP;
1636 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1637 sc->sc_vhid = -1;
1638 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1639 imo->imo_multicast_ifp = NULL;
1640 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1641 if (!--cif->vhif_nvrs) {
1642 sc->sc_carpdev->if_carp = NULL;
1643 CARP_LOCK_DESTROY(cif);
1644 free(cif, M_CARP);
1645 } else {
1646 CARP_UNLOCK(cif);
1647 }
1648 }
1649
1650 return (error);
1651 }
1652
1653 #ifdef INET6
1654 static int
1655 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1656 {
1657 struct ifnet *ifp;
1658 struct carp_if *cif;
1659 struct in6_ifaddr *ia, *ia_if;
1660 struct ip6_moptions *im6o = &sc->sc_im6o;
1661 struct in6_addr in6;
1662 int own, error;
1663
1664 error = 0;
1665
1666 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1667 if (!(SC2IFP(sc)->if_flags & IFF_UP))
1668 carp_set_state(sc, INIT);
1669 if (sc->sc_naddrs6)
1670 SC2IFP(sc)->if_flags |= IFF_UP;
1671 if (sc->sc_carpdev)
1672 CARP_SCLOCK(sc);
1673 carp_setrun(sc, 0);
1674 if (sc->sc_carpdev)
1675 CARP_SCUNLOCK(sc);
1676 return (0);
1677 }
1678
1679 /* we have to do it by hands to check we won't match on us */
1680 ia_if = NULL; own = 0;
1681 IN6_IFADDR_RLOCK();
1682 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
1683 int i;
1684
1685 for (i = 0; i < 4; i++) {
1686 if ((sin6->sin6_addr.s6_addr32[i] &
1687 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
1688 (ia->ia_addr.sin6_addr.s6_addr32[i] &
1689 ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
1690 break;
1691 }
1692 /* and, yeah, we need a multicast-capable iface too */
1693 if (ia->ia_ifp != SC2IFP(sc) &&
1694 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1695 (i == 4)) {
1696 if (!ia_if)
1697 ia_if = ia;
1698 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
1699 &ia->ia_addr.sin6_addr))
1700 own++;
1701 }
1702 }
1703
1704 if (!ia_if) {
1705 IN6_IFADDR_RUNLOCK();
1706 return (EADDRNOTAVAIL);
1707 }
1708 ia = ia_if;
1709 ifa_ref(&ia->ia_ifa);
1710 IN6_IFADDR_RUNLOCK();
1711 ifp = ia->ia_ifp;
1712
1713 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1714 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp)) {
1715 ifa_free(&ia->ia_ifa);
1716 return (EADDRNOTAVAIL);
1717 }
1718
1719 if (!sc->sc_naddrs6) {
1720 struct in6_multi *in6m;
1721
1722 im6o->im6o_multicast_ifp = ifp;
1723
1724 /* join CARP multicast address */
1725 bzero(&in6, sizeof(in6));
1726 in6.s6_addr16[0] = htons(0xff02);
1727 in6.s6_addr8[15] = 0x12;
1728 if (in6_setscope(&in6, ifp, NULL) != 0)
1729 goto cleanup;
1730 in6m = NULL;
1731 error = in6_mc_join(ifp, &in6, NULL, &in6m, 0);
1732 if (error)
1733 goto cleanup;
1734 im6o->im6o_membership[0] = in6m;
1735 im6o->im6o_num_memberships++;
1736
1737 /* join solicited multicast address */
1738 bzero(&in6, sizeof(in6));
1739 in6.s6_addr16[0] = htons(0xff02);
1740 in6.s6_addr32[1] = 0;
1741 in6.s6_addr32[2] = htonl(1);
1742 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3];
1743 in6.s6_addr8[12] = 0xff;
1744 if (in6_setscope(&in6, ifp, NULL) != 0)
1745 goto cleanup;
1746 in6m = NULL;
1747 error = in6_mc_join(ifp, &in6, NULL, &in6m, 0);
1748 if (error)
1749 goto cleanup;
1750 im6o->im6o_membership[1] = in6m;
1751 im6o->im6o_num_memberships++;
1752 }
1753
1754 if (!ifp->if_carp) {
1755 cif = malloc(sizeof(*cif), M_CARP,
1756 M_WAITOK|M_ZERO);
1757 if (!cif) {
1758 error = ENOBUFS;
1759 goto cleanup;
1760 }
1761 if ((error = ifpromisc(ifp, 1))) {
1762 free(cif, M_CARP);
1763 goto cleanup;
1764 }
1765
1766 CARP_LOCK_INIT(cif);
1767 CARP_LOCK(cif);
1768 cif->vhif_ifp = ifp;
1769 TAILQ_INIT(&cif->vhif_vrs);
1770 ifp->if_carp = cif;
1771
1772 } else {
1773 struct carp_softc *vr;
1774
1775 cif = (struct carp_if *)ifp->if_carp;
1776 CARP_LOCK(cif);
1777 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1778 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1779 CARP_UNLOCK(cif);
1780 error = EINVAL;
1781 goto cleanup;
1782 }
1783 }
1784 sc->sc_ia6 = ia;
1785 sc->sc_carpdev = ifp;
1786
1787 { /* XXX prevent endless loop if already in queue */
1788 struct carp_softc *vr, *after = NULL;
1789 int myself = 0;
1790 cif = (struct carp_if *)ifp->if_carp;
1791 CARP_LOCK_ASSERT(cif);
1792
1793 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1794 if (vr == sc)
1795 myself = 1;
1796 if (vr->sc_vhid < sc->sc_vhid)
1797 after = vr;
1798 }
1799
1800 if (!myself) {
1801 /* We're trying to keep things in order */
1802 if (after == NULL) {
1803 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1804 } else {
1805 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1806 }
1807 cif->vhif_nvrs++;
1808 }
1809 }
1810
1811 sc->sc_naddrs6++;
1812 SC2IFP(sc)->if_flags |= IFF_UP;
1813 if (own)
1814 sc->sc_advskew = 0;
1815 carp_sc_state_locked(sc);
1816 carp_setrun(sc, 0);
1817
1818 CARP_UNLOCK(cif);
1819 ifa_free(&ia->ia_ifa); /* XXXRW: should hold reference for softc. */
1820
1821 return (0);
1822
1823 cleanup:
1824 if (!sc->sc_naddrs6)
1825 carp_multicast6_cleanup(sc, 1);
1826 ifa_free(&ia->ia_ifa);
1827 return (error);
1828 }
1829
1830 static int
1831 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1832 {
1833 int error = 0;
1834
1835 if (!--sc->sc_naddrs6) {
1836 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1837
1838 CARP_LOCK(cif);
1839 callout_stop(&sc->sc_ad_tmo);
1840 SC2IFP(sc)->if_flags &= ~IFF_UP;
1841 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1842 sc->sc_vhid = -1;
1843 carp_multicast6_cleanup(sc, 1);
1844 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1845 if (!--cif->vhif_nvrs) {
1846 CARP_LOCK_DESTROY(cif);
1847 sc->sc_carpdev->if_carp = NULL;
1848 free(cif, M_CARP);
1849 } else
1850 CARP_UNLOCK(cif);
1851 }
1852
1853 return (error);
1854 }
1855 #endif /* INET6 */
1856
1857 static int
1858 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr)
1859 {
1860 struct carp_softc *sc = ifp->if_softc, *vr;
1861 struct carpreq carpr;
1862 struct ifaddr *ifa;
1863 struct ifreq *ifr;
1864 struct ifaliasreq *ifra;
1865 int locked = 0, error = 0;
1866
1867 ifa = (struct ifaddr *)addr;
1868 ifra = (struct ifaliasreq *)addr;
1869 ifr = (struct ifreq *)addr;
1870
1871 switch (cmd) {
1872 case SIOCSIFADDR:
1873 switch (ifa->ifa_addr->sa_family) {
1874 #ifdef INET
1875 case AF_INET:
1876 SC2IFP(sc)->if_flags |= IFF_UP;
1877 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1878 sizeof(struct sockaddr));
1879 error = carp_set_addr(sc, satosin(ifa->ifa_addr));
1880 break;
1881 #endif /* INET */
1882 #ifdef INET6
1883 case AF_INET6:
1884 SC2IFP(sc)->if_flags |= IFF_UP;
1885 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr));
1886 break;
1887 #endif /* INET6 */
1888 default:
1889 error = EAFNOSUPPORT;
1890 break;
1891 }
1892 break;
1893
1894 case SIOCAIFADDR:
1895 switch (ifa->ifa_addr->sa_family) {
1896 #ifdef INET
1897 case AF_INET:
1898 SC2IFP(sc)->if_flags |= IFF_UP;
1899 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1900 sizeof(struct sockaddr));
1901 error = carp_set_addr(sc, satosin(&ifra->ifra_addr));
1902 break;
1903 #endif /* INET */
1904 #ifdef INET6
1905 case AF_INET6:
1906 SC2IFP(sc)->if_flags |= IFF_UP;
1907 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr));
1908 break;
1909 #endif /* INET6 */
1910 default:
1911 error = EAFNOSUPPORT;
1912 break;
1913 }
1914 break;
1915
1916 case SIOCDIFADDR:
1917 switch (ifa->ifa_addr->sa_family) {
1918 #ifdef INET
1919 case AF_INET:
1920 error = carp_del_addr(sc, satosin(&ifra->ifra_addr));
1921 break;
1922 #endif /* INET */
1923 #ifdef INET6
1924 case AF_INET6:
1925 error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr));
1926 break;
1927 #endif /* INET6 */
1928 default:
1929 error = EAFNOSUPPORT;
1930 break;
1931 }
1932 break;
1933
1934 case SIOCSIFFLAGS:
1935 if (sc->sc_carpdev) {
1936 locked = 1;
1937 CARP_SCLOCK(sc);
1938 }
1939 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) {
1940 callout_stop(&sc->sc_ad_tmo);
1941 callout_stop(&sc->sc_md_tmo);
1942 callout_stop(&sc->sc_md6_tmo);
1943 if (sc->sc_state == MASTER)
1944 carp_send_ad_locked(sc);
1945 carp_set_state(sc, INIT);
1946 carp_setrun(sc, 0);
1947 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) {
1948 SC2IFP(sc)->if_flags |= IFF_UP;
1949 carp_setrun(sc, 0);
1950 }
1951 break;
1952
1953 case SIOCSVH:
1954 error = priv_check(curthread, PRIV_NETINET_CARP);
1955 if (error)
1956 break;
1957 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr)))
1958 break;
1959 error = 1;
1960 if (sc->sc_carpdev) {
1961 locked = 1;
1962 CARP_SCLOCK(sc);
1963 }
1964 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) {
1965 switch (carpr.carpr_state) {
1966 case BACKUP:
1967 callout_stop(&sc->sc_ad_tmo);
1968 carp_set_state(sc, BACKUP);
1969 carp_setrun(sc, 0);
1970 carp_setroute(sc, RTM_DELETE);
1971 break;
1972 case MASTER:
1973 carp_master_down_locked(sc);
1974 break;
1975 default:
1976 break;
1977 }
1978 }
1979 if (carpr.carpr_vhid > 0) {
1980 if (carpr.carpr_vhid > 255) {
1981 error = EINVAL;
1982 break;
1983 }
1984 if (sc->sc_carpdev) {
1985 struct carp_if *cif;
1986 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1987 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1988 if (vr != sc &&
1989 vr->sc_vhid == carpr.carpr_vhid) {
1990 error = EEXIST;
1991 break;
1992 }
1993 if (error == EEXIST)
1994 break;
1995 }
1996 sc->sc_vhid = carpr.carpr_vhid;
1997 IF_LLADDR(sc->sc_ifp)[0] = 0;
1998 IF_LLADDR(sc->sc_ifp)[1] = 0;
1999 IF_LLADDR(sc->sc_ifp)[2] = 0x5e;
2000 IF_LLADDR(sc->sc_ifp)[3] = 0;
2001 IF_LLADDR(sc->sc_ifp)[4] = 1;
2002 IF_LLADDR(sc->sc_ifp)[5] = sc->sc_vhid;
2003 error--;
2004 }
2005 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) {
2006 if (carpr.carpr_advskew >= 255) {
2007 error = EINVAL;
2008 break;
2009 }
2010 if (carpr.carpr_advbase > 255) {
2011 error = EINVAL;
2012 break;
2013 }
2014 sc->sc_advbase = carpr.carpr_advbase;
2015 sc->sc_advskew = carpr.carpr_advskew;
2016 error--;
2017 }
2018 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key));
2019 if (error > 0)
2020 error = EINVAL;
2021 else {
2022 error = 0;
2023 carp_setrun(sc, 0);
2024 }
2025 break;
2026
2027 case SIOCGVH:
2028 /* XXX: lockless read */
2029 bzero(&carpr, sizeof(carpr));
2030 carpr.carpr_state = sc->sc_state;
2031 carpr.carpr_vhid = sc->sc_vhid;
2032 carpr.carpr_advbase = sc->sc_advbase;
2033 carpr.carpr_advskew = sc->sc_advskew;
2034 error = priv_check(curthread, PRIV_NETINET_CARP);
2035 if (error == 0)
2036 bcopy(sc->sc_key, carpr.carpr_key,
2037 sizeof(carpr.carpr_key));
2038 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
2039 break;
2040
2041 default:
2042 error = EINVAL;
2043 }
2044
2045 if (locked)
2046 CARP_SCUNLOCK(sc);
2047
2048 carp_hmac_prepare(sc);
2049
2050 return (error);
2051 }
2052
2053 /*
2054 * XXX: this is looutput. We should eventually use it from there.
2055 */
2056 static int
2057 carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
2058 struct route *ro)
2059 {
2060 u_int32_t af;
2061 struct rtentry *rt = NULL;
2062
2063 M_ASSERTPKTHDR(m); /* check if we have the packet header */
2064
2065 if (ro != NULL)
2066 rt = ro->ro_rt;
2067 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
2068 m_freem(m);
2069 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
2070 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
2071 }
2072
2073 ifp->if_opackets++;
2074 ifp->if_obytes += m->m_pkthdr.len;
2075
2076 /* BPF writes need to be handled specially. */
2077 if (dst->sa_family == AF_UNSPEC) {
2078 bcopy(dst->sa_data, &af, sizeof(af));
2079 dst->sa_family = af;
2080 }
2081
2082 #if 1 /* XXX */
2083 switch (dst->sa_family) {
2084 case AF_INET:
2085 case AF_INET6:
2086 case AF_IPX:
2087 case AF_APPLETALK:
2088 break;
2089 default:
2090 printf("carp_looutput: af=%d unexpected\n", dst->sa_family);
2091 m_freem(m);
2092 return (EAFNOSUPPORT);
2093 }
2094 #endif
2095 return(if_simloop(ifp, m, dst->sa_family, 0));
2096 }
2097
2098 /*
2099 * Start output on carp interface. This function should never be called.
2100 */
2101 static void
2102 carp_start(struct ifnet *ifp)
2103 {
2104 #ifdef DEBUG
2105 printf("%s: start called\n", ifp->if_xname);
2106 #endif
2107 }
2108
2109 int
2110 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
2111 struct rtentry *rt)
2112 {
2113 struct m_tag *mtag;
2114 struct carp_softc *sc;
2115 struct ifnet *carp_ifp;
2116
2117 if (!sa)
2118 return (0);
2119
2120 switch (sa->sa_family) {
2121 #ifdef INET
2122 case AF_INET:
2123 break;
2124 #endif /* INET */
2125 #ifdef INET6
2126 case AF_INET6:
2127 break;
2128 #endif /* INET6 */
2129 default:
2130 return (0);
2131 }
2132
2133 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL);
2134 if (mtag == NULL)
2135 return (0);
2136
2137 bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *));
2138 sc = carp_ifp->if_softc;
2139
2140 /* Set the source MAC address to Virtual Router MAC Address */
2141 switch (ifp->if_type) {
2142 case IFT_ETHER:
2143 case IFT_L2VLAN: {
2144 struct ether_header *eh;
2145
2146 eh = mtod(m, struct ether_header *);
2147 eh->ether_shost[0] = 0;
2148 eh->ether_shost[1] = 0;
2149 eh->ether_shost[2] = 0x5e;
2150 eh->ether_shost[3] = 0;
2151 eh->ether_shost[4] = 1;
2152 eh->ether_shost[5] = sc->sc_vhid;
2153 }
2154 break;
2155 case IFT_FDDI: {
2156 struct fddi_header *fh;
2157
2158 fh = mtod(m, struct fddi_header *);
2159 fh->fddi_shost[0] = 0;
2160 fh->fddi_shost[1] = 0;
2161 fh->fddi_shost[2] = 0x5e;
2162 fh->fddi_shost[3] = 0;
2163 fh->fddi_shost[4] = 1;
2164 fh->fddi_shost[5] = sc->sc_vhid;
2165 }
2166 break;
2167 case IFT_ISO88025: {
2168 struct iso88025_header *th;
2169 th = mtod(m, struct iso88025_header *);
2170 th->iso88025_shost[0] = 3;
2171 th->iso88025_shost[1] = 0;
2172 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1);
2173 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1);
2174 th->iso88025_shost[4] = 0;
2175 th->iso88025_shost[5] = 0;
2176 }
2177 break;
2178 default:
2179 printf("%s: carp is not supported for this interface type\n",
2180 ifp->if_xname);
2181 return (EOPNOTSUPP);
2182 }
2183
2184 return (0);
2185 }
2186
2187 static void
2188 carp_set_state(struct carp_softc *sc, int state)
2189 {
2190 int link_state;
2191
2192 if (sc->sc_carpdev)
2193 CARP_SCLOCK_ASSERT(sc);
2194
2195 if (sc->sc_state == state)
2196 return;
2197
2198 sc->sc_state = state;
2199 switch (state) {
2200 case BACKUP:
2201 link_state = LINK_STATE_DOWN;
2202 break;
2203 case MASTER:
2204 link_state = LINK_STATE_UP;
2205 break;
2206 default:
2207 link_state = LINK_STATE_UNKNOWN;
2208 break;
2209 }
2210 if_link_state_change(SC2IFP(sc), link_state);
2211 }
2212
2213 void
2214 carp_carpdev_state(struct ifnet *ifp)
2215 {
2216 struct carp_if *cif;
2217
2218 cif = ifp->if_carp;
2219 CARP_LOCK(cif);
2220 carp_carpdev_state_locked(cif);
2221 CARP_UNLOCK(cif);
2222 }
2223
2224 static void
2225 carp_carpdev_state_locked(struct carp_if *cif)
2226 {
2227 struct carp_softc *sc;
2228
2229 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
2230 carp_sc_state_locked(sc);
2231 }
2232
2233 static void
2234 carp_sc_state_locked(struct carp_softc *sc)
2235 {
2236 CARP_SCLOCK_ASSERT(sc);
2237
2238 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP ||
2239 !(sc->sc_carpdev->if_flags & IFF_UP)) {
2240 sc->sc_flags_backup = SC2IFP(sc)->if_flags;
2241 SC2IFP(sc)->if_flags &= ~IFF_UP;
2242 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
2243 callout_stop(&sc->sc_ad_tmo);
2244 callout_stop(&sc->sc_md_tmo);
2245 callout_stop(&sc->sc_md6_tmo);
2246 carp_set_state(sc, INIT);
2247 carp_setrun(sc, 0);
2248 if (!sc->sc_suppress) {
2249 carp_suppress_preempt++;
2250 if (carp_suppress_preempt == 1) {
2251 CARP_SCUNLOCK(sc);
2252 carp_send_ad_all();
2253 CARP_SCLOCK(sc);
2254 }
2255 }
2256 sc->sc_suppress = 1;
2257 } else {
2258 SC2IFP(sc)->if_flags |= sc->sc_flags_backup;
2259 carp_set_state(sc, INIT);
2260 carp_setrun(sc, 0);
2261 if (sc->sc_suppress)
2262 carp_suppress_preempt--;
2263 sc->sc_suppress = 0;
2264 }
2265
2266 return;
2267 }
2268
2269 #ifdef INET
2270 extern struct domain inetdomain;
2271 static struct protosw in_carp_protosw = {
2272 .pr_type = SOCK_RAW,
2273 .pr_domain = &inetdomain,
2274 .pr_protocol = IPPROTO_CARP,
2275 .pr_flags = PR_ATOMIC|PR_ADDR,
2276 .pr_input = carp_input,
2277 .pr_output = (pr_output_t *)rip_output,
2278 .pr_ctloutput = rip_ctloutput,
2279 .pr_usrreqs = &rip_usrreqs
2280 };
2281 #endif
2282
2283 #ifdef INET6
2284 extern struct domain inet6domain;
2285 static struct ip6protosw in6_carp_protosw = {
2286 .pr_type = SOCK_RAW,
2287 .pr_domain = &inet6domain,
2288 .pr_protocol = IPPROTO_CARP,
2289 .pr_flags = PR_ATOMIC|PR_ADDR,
2290 .pr_input = carp6_input,
2291 .pr_output = rip6_output,
2292 .pr_ctloutput = rip6_ctloutput,
2293 .pr_usrreqs = &rip6_usrreqs
2294 };
2295 #endif
2296
2297 static void
2298 carp_mod_cleanup(void)
2299 {
2300
2301 if (if_detach_event_tag == NULL)
2302 return;
2303 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag);
2304 if_clone_detach(&carp_cloner);
2305 #ifdef INET
2306 if (proto_reg[CARP_INET] == 0) {
2307 (void)ipproto_unregister(IPPROTO_CARP);
2308 pf_proto_unregister(PF_INET, IPPROTO_CARP, SOCK_RAW);
2309 proto_reg[CARP_INET] = -1;
2310 }
2311 carp_iamatch_p = NULL;
2312 #endif
2313 #ifdef INET6
2314 if (proto_reg[CARP_INET6] == 0) {
2315 (void)ip6proto_unregister(IPPROTO_CARP);
2316 pf_proto_unregister(PF_INET6, IPPROTO_CARP, SOCK_RAW);
2317 proto_reg[CARP_INET6] = -1;
2318 }
2319 carp_iamatch6_p = NULL;
2320 carp_macmatch6_p = NULL;
2321 #endif
2322 carp_linkstate_p = NULL;
2323 carp_forus_p = NULL;
2324 carp_output_p = NULL;
2325 mtx_destroy(&carp_mtx);
2326 }
2327
2328 static int
2329 carp_mod_load(void)
2330 {
2331 int err;
2332
2333 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
2334 carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY);
2335 if (if_detach_event_tag == NULL)
2336 return (ENOMEM);
2337 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF);
2338 LIST_INIT(&carpif_list);
2339 if_clone_attach(&carp_cloner);
2340 carp_linkstate_p = carp_carpdev_state;
2341 carp_forus_p = carp_forus;
2342 carp_output_p = carp_output;
2343 #ifdef INET6
2344 carp_iamatch6_p = carp_iamatch6;
2345 carp_macmatch6_p = carp_macmatch6;
2346 proto_reg[CARP_INET6] = pf_proto_register(PF_INET6,
2347 (struct protosw *)&in6_carp_protosw);
2348 if (proto_reg[CARP_INET6] != 0) {
2349 printf("carp: error %d attaching to PF_INET6\n",
2350 proto_reg[CARP_INET6]);
2351 carp_mod_cleanup();
2352 return (EINVAL);
2353 }
2354 err = ip6proto_register(IPPROTO_CARP);
2355 if (err) {
2356 printf("carp: error %d registering with INET6\n", err);
2357 carp_mod_cleanup();
2358 return (EINVAL);
2359 }
2360 #endif
2361 #ifdef INET
2362 carp_iamatch_p = carp_iamatch;
2363 proto_reg[CARP_INET] = pf_proto_register(PF_INET, &in_carp_protosw);
2364 if (proto_reg[CARP_INET] != 0) {
2365 printf("carp: error %d attaching to PF_INET\n",
2366 proto_reg[CARP_INET]);
2367 carp_mod_cleanup();
2368 return (EINVAL);
2369 }
2370 err = ipproto_register(IPPROTO_CARP);
2371 if (err) {
2372 printf("carp: error %d registering with INET\n", err);
2373 carp_mod_cleanup();
2374 return (EINVAL);
2375 }
2376 #endif
2377 return 0;
2378 }
2379
2380 static int
2381 carp_modevent(module_t mod, int type, void *data)
2382 {
2383 switch (type) {
2384 case MOD_LOAD:
2385 return carp_mod_load();
2386 /* NOTREACHED */
2387 case MOD_UNLOAD:
2388 /*
2389 * XXX: For now, disallow module unloading by default due to
2390 * a race condition where a thread may dereference one of the
2391 * function pointer hooks after the module has been
2392 * unloaded, during processing of a packet, causing a panic.
2393 */
2394 #ifdef CARPMOD_CAN_UNLOAD
2395 carp_mod_cleanup();
2396 #else
2397 return (EBUSY);
2398 #endif
2399 break;
2400
2401 default:
2402 return (EINVAL);
2403 }
2404
2405 return (0);
2406 }
2407
2408 static moduledata_t carp_mod = {
2409 "carp",
2410 carp_modevent,
2411 0
2412 };
2413
2414 DECLARE_MODULE(carp, carp_mod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
Cache object: 5474ef8ba7e93934a1c7016223a6501d
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