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("$FreeBSD$");
29
30 #include "opt_carp.h"
31 #include "opt_bpf.h"
32 #include "opt_inet.h"
33 #include "opt_inet6.h"
34
35 #include <sys/types.h>
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/conf.h>
39 #include <sys/kernel.h>
40 #include <sys/limits.h>
41 #include <sys/malloc.h>
42 #include <sys/mbuf.h>
43 #include <sys/module.h>
44 #include <sys/time.h>
45 #include <sys/priv.h>
46 #include <sys/proc.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
68 #ifdef INET
69 #include <netinet/in.h>
70 #include <netinet/in_var.h>
71 #include <netinet/in_systm.h>
72 #include <netinet/ip.h>
73 #include <netinet/ip_var.h>
74 #include <netinet/if_ether.h>
75 #include <machine/in_cksum.h>
76 #endif
77
78 #ifdef INET6
79 #include <netinet/icmp6.h>
80 #include <netinet/ip6.h>
81 #include <netinet6/ip6_var.h>
82 #include <netinet6/scope6_var.h>
83 #include <netinet6/nd6.h>
84 #endif
85
86 #include <crypto/sha1.h>
87 #include <netinet/ip_carp.h>
88
89 #define CARP_IFNAME "carp"
90 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces");
91 SYSCTL_DECL(_net_inet_carp);
92
93 struct carp_softc {
94 struct ifnet *sc_ifp; /* Interface clue */
95 struct ifnet *sc_carpdev; /* Pointer to parent interface */
96 struct in_ifaddr *sc_ia; /* primary iface address */
97 struct ip_moptions sc_imo;
98 #ifdef INET6
99 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */
100 struct ip6_moptions sc_im6o;
101 #endif /* INET6 */
102 TAILQ_ENTRY(carp_softc) sc_list;
103
104 enum { INIT = 0, BACKUP, MASTER } sc_state;
105
106 int sc_flags_backup;
107 int sc_suppress;
108
109 int sc_sendad_errors;
110 #define CARP_SENDAD_MAX_ERRORS 3
111 int sc_sendad_success;
112 #define CARP_SENDAD_MIN_SUCCESS 3
113
114 int sc_vhid;
115 int sc_advskew;
116 int sc_naddrs;
117 int sc_naddrs6;
118 int sc_advbase; /* seconds */
119 int sc_init_counter;
120 u_int64_t sc_counter;
121
122 /* authentication */
123 #define CARP_HMAC_PAD 64
124 unsigned char sc_key[CARP_KEY_LEN];
125 unsigned char sc_pad[CARP_HMAC_PAD];
126 SHA1_CTX sc_sha1;
127
128 struct callout sc_ad_tmo; /* advertisement timeout */
129 struct callout sc_md_tmo; /* master down timeout */
130 struct callout sc_md6_tmo; /* master down timeout */
131
132 LIST_ENTRY(carp_softc) sc_next; /* Interface clue */
133 };
134 #define SC2IFP(sc) ((sc)->sc_ifp)
135
136 int carp_suppress_preempt = 0;
137 int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */
138 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW,
139 &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets");
140 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW,
141 &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode");
142 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW,
143 &carp_opts[CARPCTL_LOG], 0, "log bad carp packets");
144 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW,
145 &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses");
146 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD,
147 &carp_suppress_preempt, 0, "Preemption is suppressed");
148
149 struct carpstats carpstats;
150 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW,
151 &carpstats, carpstats,
152 "CARP statistics (struct carpstats, netinet/ip_carp.h)");
153
154 struct carp_if {
155 TAILQ_HEAD(, carp_softc) vhif_vrs;
156 int vhif_nvrs;
157
158 struct ifnet *vhif_ifp;
159 struct mtx vhif_mtx;
160 };
161
162 /* Get carp_if from softc. Valid after carp_set_addr{,6}. */
163 #define SC2CIF(sc) ((struct carp_if *)(sc)->sc_carpdev->if_carp)
164
165 /* lock per carp_if queue */
166 #define CARP_LOCK_INIT(cif) mtx_init(&(cif)->vhif_mtx, "carp_if", \
167 NULL, MTX_DEF)
168 #define CARP_LOCK_DESTROY(cif) mtx_destroy(&(cif)->vhif_mtx)
169 #define CARP_LOCK_ASSERT(cif) mtx_assert(&(cif)->vhif_mtx, MA_OWNED)
170 #define CARP_LOCK(cif) mtx_lock(&(cif)->vhif_mtx)
171 #define CARP_UNLOCK(cif) mtx_unlock(&(cif)->vhif_mtx)
172
173 #define CARP_SCLOCK(sc) mtx_lock(&SC2CIF(sc)->vhif_mtx)
174 #define CARP_SCUNLOCK(sc) mtx_unlock(&SC2CIF(sc)->vhif_mtx)
175 #define CARP_SCLOCK_ASSERT(sc) mtx_assert(&SC2CIF(sc)->vhif_mtx, MA_OWNED)
176
177 #define CARP_LOG(...) do { \
178 if (carp_opts[CARPCTL_LOG] > 0) \
179 log(LOG_INFO, __VA_ARGS__); \
180 } while (0)
181
182 #define CARP_DEBUG(...) do { \
183 if (carp_opts[CARPCTL_LOG] > 1) \
184 log(LOG_DEBUG, __VA_ARGS__); \
185 } while (0)
186
187 static void carp_hmac_prepare(struct carp_softc *);
188 static void carp_hmac_generate(struct carp_softc *, u_int32_t *,
189 unsigned char *);
190 static int carp_hmac_verify(struct carp_softc *, u_int32_t *,
191 unsigned char *);
192 static void carp_setroute(struct carp_softc *, int);
193 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t);
194 static int carp_clone_create(struct if_clone *, int, caddr_t);
195 static void carp_clone_destroy(struct ifnet *);
196 static void carpdetach(struct carp_softc *, int);
197 static int carp_prepare_ad(struct mbuf *, struct carp_softc *,
198 struct carp_header *);
199 static void carp_send_ad_all(void);
200 static void carp_send_ad(void *);
201 static void carp_send_ad_locked(struct carp_softc *);
202 static void carp_send_arp(struct carp_softc *);
203 static void carp_master_down(void *);
204 static void carp_master_down_locked(struct carp_softc *);
205 static int carp_ioctl(struct ifnet *, u_long, caddr_t);
206 static int carp_looutput(struct ifnet *, struct mbuf *, struct sockaddr *,
207 struct rtentry *);
208 static void carp_start(struct ifnet *);
209 static void carp_setrun(struct carp_softc *, sa_family_t);
210 static void carp_set_state(struct carp_softc *, int);
211 static int carp_addrcount(struct carp_if *, struct in_ifaddr *, int);
212 enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING };
213
214 static void carp_multicast_cleanup(struct carp_softc *);
215 static int carp_set_addr(struct carp_softc *, struct sockaddr_in *);
216 static int carp_del_addr(struct carp_softc *, struct sockaddr_in *);
217 static void carp_carpdev_state_locked(struct carp_if *);
218 static void carp_sc_state_locked(struct carp_softc *);
219 #ifdef INET6
220 static void carp_send_na(struct carp_softc *);
221 static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *);
222 static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *);
223 static void carp_multicast6_cleanup(struct carp_softc *);
224 #endif
225
226 static LIST_HEAD(, carp_softc) carpif_list;
227 static struct mtx carp_mtx;
228 IFC_SIMPLE_DECLARE(carp, 0);
229
230 static eventhandler_tag if_detach_event_tag;
231
232 static __inline u_int16_t
233 carp_cksum(struct mbuf *m, int len)
234 {
235 return (in_cksum(m, len));
236 }
237
238 static void
239 carp_hmac_prepare(struct carp_softc *sc)
240 {
241 u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
242 u_int8_t vhid = sc->sc_vhid & 0xff;
243 struct ifaddr *ifa;
244 int i, found;
245 #ifdef INET
246 struct in_addr last, cur, in;
247 #endif
248 #ifdef INET6
249 struct in6_addr last6, cur6, in6;
250 #endif
251
252 if (sc->sc_carpdev)
253 CARP_SCLOCK(sc);
254
255 /* XXX: possible race here */
256
257 /* compute ipad from key */
258 bzero(sc->sc_pad, sizeof(sc->sc_pad));
259 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
260 for (i = 0; i < sizeof(sc->sc_pad); i++)
261 sc->sc_pad[i] ^= 0x36;
262
263 /* precompute first part of inner hash */
264 SHA1Init(&sc->sc_sha1);
265 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
266 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
267 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
268 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
269 #ifdef INET
270 cur.s_addr = 0;
271 do {
272 found = 0;
273 last = cur;
274 cur.s_addr = 0xffffffff;
275 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
276 in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr;
277 if (ifa->ifa_addr->sa_family == AF_INET &&
278 ntohl(in.s_addr) > ntohl(last.s_addr) &&
279 ntohl(in.s_addr) < ntohl(cur.s_addr)) {
280 cur.s_addr = in.s_addr;
281 found++;
282 }
283 }
284 if (found)
285 SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur));
286 } while (found);
287 #endif /* INET */
288 #ifdef INET6
289 memset(&cur6, 0, sizeof(cur6));
290 do {
291 found = 0;
292 last6 = cur6;
293 memset(&cur6, 0xff, sizeof(cur6));
294 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
295 in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
296 if (IN6_IS_SCOPE_EMBED(&in6))
297 in6.s6_addr16[1] = 0;
298 if (ifa->ifa_addr->sa_family == AF_INET6 &&
299 memcmp(&in6, &last6, sizeof(in6)) > 0 &&
300 memcmp(&in6, &cur6, sizeof(in6)) < 0) {
301 cur6 = in6;
302 found++;
303 }
304 }
305 if (found)
306 SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6));
307 } while (found);
308 #endif /* INET6 */
309
310 /* convert ipad to opad */
311 for (i = 0; i < sizeof(sc->sc_pad); i++)
312 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
313
314 if (sc->sc_carpdev)
315 CARP_SCUNLOCK(sc);
316 }
317
318 static void
319 carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2],
320 unsigned char md[20])
321 {
322 SHA1_CTX sha1ctx;
323
324 /* fetch first half of inner hash */
325 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
326
327 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
328 SHA1Final(md, &sha1ctx);
329
330 /* outer hash */
331 SHA1Init(&sha1ctx);
332 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
333 SHA1Update(&sha1ctx, md, 20);
334 SHA1Final(md, &sha1ctx);
335 }
336
337 static int
338 carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2],
339 unsigned char md[20])
340 {
341 unsigned char md2[20];
342
343 CARP_SCLOCK_ASSERT(sc);
344
345 carp_hmac_generate(sc, counter, md2);
346
347 return (bcmp(md, md2, sizeof(md2)));
348 }
349
350 static void
351 carp_setroute(struct carp_softc *sc, int cmd)
352 {
353 struct ifaddr *ifa;
354 int s;
355
356 if (sc->sc_carpdev)
357 CARP_SCLOCK_ASSERT(sc);
358
359 s = splnet();
360 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
361 if (ifa->ifa_addr->sa_family == AF_INET &&
362 sc->sc_carpdev != NULL) {
363 int count = carp_addrcount(
364 (struct carp_if *)sc->sc_carpdev->if_carp,
365 ifatoia(ifa), CARP_COUNT_MASTER);
366
367 if ((cmd == RTM_ADD && count == 1) ||
368 (cmd == RTM_DELETE && count == 0))
369 rtinit(ifa, cmd, RTF_UP | RTF_HOST);
370 }
371 #ifdef INET6
372 if (ifa->ifa_addr->sa_family == AF_INET6) {
373 if (cmd == RTM_ADD)
374 in6_ifaddloop(ifa);
375 else
376 in6_ifremloop(ifa);
377 }
378 #endif /* INET6 */
379 }
380 splx(s);
381 }
382
383 static int
384 carp_clone_create(struct if_clone *ifc, int unit, caddr_t params)
385 {
386
387 struct carp_softc *sc;
388 struct ifnet *ifp;
389
390 MALLOC(sc, struct carp_softc *, sizeof(*sc), M_CARP, M_WAITOK|M_ZERO);
391 ifp = SC2IFP(sc) = if_alloc(IFT_ETHER);
392 if (ifp == NULL) {
393 FREE(sc, M_CARP);
394 return (ENOSPC);
395 }
396
397 sc->sc_flags_backup = 0;
398 sc->sc_suppress = 0;
399 sc->sc_advbase = CARP_DFLTINTV;
400 sc->sc_vhid = -1; /* required setting */
401 sc->sc_advskew = 0;
402 sc->sc_init_counter = 1;
403 sc->sc_naddrs = sc->sc_naddrs6 = 0; /* M_ZERO? */
404 #ifdef INET6
405 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
406 #endif
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
414 callout_init(&sc->sc_ad_tmo, CALLOUT_MPSAFE);
415 callout_init(&sc->sc_md_tmo, CALLOUT_MPSAFE);
416 callout_init(&sc->sc_md6_tmo, CALLOUT_MPSAFE);
417
418 ifp->if_softc = sc;
419 if_initname(ifp, CARP_IFNAME, unit);
420 ifp->if_mtu = ETHERMTU;
421 ifp->if_flags = IFF_LOOPBACK;
422 ifp->if_ioctl = carp_ioctl;
423 ifp->if_output = carp_looutput;
424 ifp->if_start = carp_start;
425 ifp->if_type = IFT_CARP;
426 ifp->if_snd.ifq_maxlen = ifqmaxlen;
427 ifp->if_hdrlen = 0;
428 if_attach(ifp);
429 bpfattach(SC2IFP(sc), DLT_NULL, sizeof(u_int32_t));
430 mtx_lock(&carp_mtx);
431 LIST_INSERT_HEAD(&carpif_list, sc, sc_next);
432 mtx_unlock(&carp_mtx);
433 return (0);
434 }
435
436 static void
437 carp_clone_destroy(struct ifnet *ifp)
438 {
439 struct carp_softc *sc = ifp->if_softc;
440
441 if (sc->sc_carpdev)
442 CARP_SCLOCK(sc);
443 carpdetach(sc, 1); /* Returns unlocked. */
444
445 mtx_lock(&carp_mtx);
446 LIST_REMOVE(sc, sc_next);
447 mtx_unlock(&carp_mtx);
448 bpfdetach(ifp);
449 if_detach(ifp);
450 if_free_type(ifp, IFT_ETHER);
451 free(sc->sc_imo.imo_membership, M_CARP);
452 free(sc, M_CARP);
453 }
454
455 /*
456 * This function can be called on CARP interface destroy path,
457 * and in case of the removal of the underlying interface as
458 * well. We differentiate these two cases. In the latter case
459 * we do not cleanup our multicast memberships, since they
460 * are already freed. Also, in the latter case we do not
461 * release the lock on return, because the function will be
462 * called once more, for another CARP instance on the same
463 * interface.
464 */
465 static void
466 carpdetach(struct carp_softc *sc, int unlock)
467 {
468 struct carp_if *cif;
469
470 callout_stop(&sc->sc_ad_tmo);
471 callout_stop(&sc->sc_md_tmo);
472 callout_stop(&sc->sc_md6_tmo);
473
474 if (sc->sc_suppress)
475 carp_suppress_preempt--;
476 sc->sc_suppress = 0;
477
478 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
479 carp_suppress_preempt--;
480 sc->sc_sendad_errors = 0;
481
482 carp_set_state(sc, INIT);
483 SC2IFP(sc)->if_flags &= ~IFF_UP;
484 carp_setrun(sc, 0);
485 if (unlock)
486 carp_multicast_cleanup(sc);
487 #ifdef INET6
488 carp_multicast6_cleanup(sc);
489 #endif
490
491 if (sc->sc_carpdev != NULL) {
492 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
493 CARP_LOCK_ASSERT(cif);
494 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
495 if (!--cif->vhif_nvrs) {
496 ifpromisc(sc->sc_carpdev, 0);
497 sc->sc_carpdev->if_carp = NULL;
498 CARP_LOCK_DESTROY(cif);
499 FREE(cif, M_IFADDR);
500 } else if (unlock)
501 CARP_UNLOCK(cif);
502 sc->sc_carpdev = NULL;
503 }
504 }
505
506 /* Detach an interface from the carp. */
507 static void
508 carp_ifdetach(void *arg __unused, struct ifnet *ifp)
509 {
510 struct carp_if *cif = (struct carp_if *)ifp->if_carp;
511 struct carp_softc *sc, *nextsc;
512
513 if (cif == NULL)
514 return;
515
516 /*
517 * XXX: At the end of for() cycle the lock will be destroyed.
518 */
519 CARP_LOCK(cif);
520 for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) {
521 nextsc = TAILQ_NEXT(sc, sc_list);
522 carpdetach(sc, 0);
523 }
524 }
525
526 /*
527 * process input packet.
528 * we have rearranged checks order compared to the rfc,
529 * but it seems more efficient this way or not possible otherwise.
530 */
531 void
532 carp_input(struct mbuf *m, int hlen)
533 {
534 struct ip *ip = mtod(m, struct ip *);
535 struct carp_header *ch;
536 int iplen, len;
537
538 carpstats.carps_ipackets++;
539
540 if (!carp_opts[CARPCTL_ALLOW]) {
541 m_freem(m);
542 return;
543 }
544
545 /* check if received on a valid carp interface */
546 if (m->m_pkthdr.rcvif->if_carp == NULL) {
547 carpstats.carps_badif++;
548 CARP_LOG("carp_input: packet received on non-carp "
549 "interface: %s\n",
550 m->m_pkthdr.rcvif->if_xname);
551 m_freem(m);
552 return;
553 }
554
555 /* verify that the IP TTL is 255. */
556 if (ip->ip_ttl != CARP_DFLTTL) {
557 carpstats.carps_badttl++;
558 CARP_LOG("carp_input: received ttl %d != 255i on %s\n",
559 ip->ip_ttl,
560 m->m_pkthdr.rcvif->if_xname);
561 m_freem(m);
562 return;
563 }
564
565 iplen = ip->ip_hl << 2;
566
567 if (m->m_pkthdr.len < iplen + sizeof(*ch)) {
568 carpstats.carps_badlen++;
569 CARP_LOG("carp_input: received len %zd < "
570 "sizeof(struct carp_header)\n",
571 m->m_len - sizeof(struct ip));
572 m_freem(m);
573 return;
574 }
575
576 if (iplen + sizeof(*ch) < m->m_len) {
577 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) {
578 carpstats.carps_hdrops++;
579 CARP_LOG("carp_input: pullup failed\n");
580 return;
581 }
582 ip = mtod(m, struct ip *);
583 }
584 ch = (struct carp_header *)((char *)ip + iplen);
585
586 /*
587 * verify that the received packet length is
588 * equal to the CARP header
589 */
590 len = iplen + sizeof(*ch);
591 if (len > m->m_pkthdr.len) {
592 carpstats.carps_badlen++;
593 CARP_LOG("carp_input: packet too short %d on %s\n",
594 m->m_pkthdr.len,
595 m->m_pkthdr.rcvif->if_xname);
596 m_freem(m);
597 return;
598 }
599
600 if ((m = m_pullup(m, len)) == NULL) {
601 carpstats.carps_hdrops++;
602 return;
603 }
604 ip = mtod(m, struct ip *);
605 ch = (struct carp_header *)((char *)ip + iplen);
606
607 /* verify the CARP checksum */
608 m->m_data += iplen;
609 if (carp_cksum(m, len - iplen)) {
610 carpstats.carps_badsum++;
611 CARP_LOG("carp_input: checksum failed on %s\n",
612 m->m_pkthdr.rcvif->if_xname);
613 m_freem(m);
614 return;
615 }
616 m->m_data -= iplen;
617
618 carp_input_c(m, ch, AF_INET);
619 }
620
621 #ifdef INET6
622 int
623 carp6_input(struct mbuf **mp, int *offp, int proto)
624 {
625 struct mbuf *m = *mp;
626 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
627 struct carp_header *ch;
628 u_int len;
629
630 carpstats.carps_ipackets6++;
631
632 if (!carp_opts[CARPCTL_ALLOW]) {
633 m_freem(m);
634 return (IPPROTO_DONE);
635 }
636
637 /* check if received on a valid carp interface */
638 if (m->m_pkthdr.rcvif->if_carp == NULL) {
639 carpstats.carps_badif++;
640 CARP_LOG("carp6_input: packet received on non-carp "
641 "interface: %s\n",
642 m->m_pkthdr.rcvif->if_xname);
643 m_freem(m);
644 return (IPPROTO_DONE);
645 }
646
647 /* verify that the IP TTL is 255 */
648 if (ip6->ip6_hlim != CARP_DFLTTL) {
649 carpstats.carps_badttl++;
650 CARP_LOG("carp6_input: received ttl %d != 255 on %s\n",
651 ip6->ip6_hlim,
652 m->m_pkthdr.rcvif->if_xname);
653 m_freem(m);
654 return (IPPROTO_DONE);
655 }
656
657 /* verify that we have a complete carp packet */
658 len = m->m_len;
659 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
660 if (ch == NULL) {
661 carpstats.carps_badlen++;
662 CARP_LOG("carp6_input: packet size %u too small\n", len);
663 return (IPPROTO_DONE);
664 }
665
666
667 /* verify the CARP checksum */
668 m->m_data += *offp;
669 if (carp_cksum(m, sizeof(*ch))) {
670 carpstats.carps_badsum++;
671 CARP_LOG("carp6_input: checksum failed, on %s\n",
672 m->m_pkthdr.rcvif->if_xname);
673 m_freem(m);
674 return (IPPROTO_DONE);
675 }
676 m->m_data -= *offp;
677
678 carp_input_c(m, ch, AF_INET6);
679 return (IPPROTO_DONE);
680 }
681 #endif /* INET6 */
682
683 static void
684 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af)
685 {
686 struct ifnet *ifp = m->m_pkthdr.rcvif;
687 struct carp_softc *sc;
688 u_int64_t tmp_counter;
689 struct timeval sc_tv, ch_tv;
690
691 /* verify that the VHID is valid on the receiving interface */
692 CARP_LOCK(ifp->if_carp);
693 TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list)
694 if (sc->sc_vhid == ch->carp_vhid)
695 break;
696
697 if (!sc || !((SC2IFP(sc)->if_flags & IFF_UP) &&
698 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) {
699 carpstats.carps_badvhid++;
700 CARP_UNLOCK(ifp->if_carp);
701 m_freem(m);
702 return;
703 }
704
705 getmicrotime(&SC2IFP(sc)->if_lastchange);
706 SC2IFP(sc)->if_ipackets++;
707 SC2IFP(sc)->if_ibytes += m->m_pkthdr.len;
708
709 if (bpf_peers_present(SC2IFP(sc)->if_bpf)) {
710 struct ip *ip = mtod(m, struct ip *);
711 uint32_t af1 = af;
712
713 /* BPF wants net byte order */
714 ip->ip_len = htons(ip->ip_len + (ip->ip_hl << 2));
715 ip->ip_off = htons(ip->ip_off);
716 bpf_mtap2(SC2IFP(sc)->if_bpf, &af1, sizeof(af1), m);
717 }
718
719 /* verify the CARP version. */
720 if (ch->carp_version != CARP_VERSION) {
721 carpstats.carps_badver++;
722 SC2IFP(sc)->if_ierrors++;
723 CARP_UNLOCK(ifp->if_carp);
724 CARP_LOG("%s; invalid version %d\n",
725 SC2IFP(sc)->if_xname,
726 ch->carp_version);
727 m_freem(m);
728 return;
729 }
730
731 /* verify the hash */
732 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
733 carpstats.carps_badauth++;
734 SC2IFP(sc)->if_ierrors++;
735 CARP_UNLOCK(ifp->if_carp);
736 CARP_LOG("%s: incorrect hash\n", SC2IFP(sc)->if_xname);
737 m_freem(m);
738 return;
739 }
740
741 tmp_counter = ntohl(ch->carp_counter[0]);
742 tmp_counter = tmp_counter<<32;
743 tmp_counter += ntohl(ch->carp_counter[1]);
744
745 /* XXX Replay protection goes here */
746
747 sc->sc_init_counter = 0;
748 sc->sc_counter = tmp_counter;
749
750 sc_tv.tv_sec = sc->sc_advbase;
751 if (carp_suppress_preempt && sc->sc_advskew < 240)
752 sc_tv.tv_usec = 240 * 1000000 / 256;
753 else
754 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256;
755 ch_tv.tv_sec = ch->carp_advbase;
756 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
757
758 switch (sc->sc_state) {
759 case INIT:
760 break;
761 case MASTER:
762 /*
763 * If we receive an advertisement from a master who's going to
764 * be more frequent than us, go into BACKUP state.
765 */
766 if (timevalcmp(&sc_tv, &ch_tv, >) ||
767 timevalcmp(&sc_tv, &ch_tv, ==)) {
768 callout_stop(&sc->sc_ad_tmo);
769 CARP_DEBUG("%s: MASTER -> BACKUP "
770 "(more frequent advertisement received)\n",
771 SC2IFP(sc)->if_xname);
772 carp_set_state(sc, BACKUP);
773 carp_setrun(sc, 0);
774 carp_setroute(sc, RTM_DELETE);
775 }
776 break;
777 case BACKUP:
778 /*
779 * If we're pre-empting masters who advertise slower than us,
780 * and this one claims to be slower, treat him as down.
781 */
782 if (carp_opts[CARPCTL_PREEMPT] &&
783 timevalcmp(&sc_tv, &ch_tv, <)) {
784 CARP_DEBUG("%s: BACKUP -> MASTER "
785 "(preempting a slower master)\n",
786 SC2IFP(sc)->if_xname);
787 carp_master_down_locked(sc);
788 break;
789 }
790
791 /*
792 * If the master is going to advertise at such a low frequency
793 * that he's guaranteed to time out, we'd might as well just
794 * treat him as timed out now.
795 */
796 sc_tv.tv_sec = sc->sc_advbase * 3;
797 if (timevalcmp(&sc_tv, &ch_tv, <)) {
798 CARP_DEBUG("%s: BACKUP -> MASTER "
799 "(master timed out)\n",
800 SC2IFP(sc)->if_xname);
801 carp_master_down_locked(sc);
802 break;
803 }
804
805 /*
806 * Otherwise, we reset the counter and wait for the next
807 * advertisement.
808 */
809 carp_setrun(sc, af);
810 break;
811 }
812
813 CARP_UNLOCK(ifp->if_carp);
814
815 m_freem(m);
816 return;
817 }
818
819 static int
820 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch)
821 {
822 struct m_tag *mtag;
823 struct ifnet *ifp = SC2IFP(sc);
824
825 if (sc->sc_init_counter) {
826 /* this could also be seconds since unix epoch */
827 sc->sc_counter = arc4random();
828 sc->sc_counter = sc->sc_counter << 32;
829 sc->sc_counter += arc4random();
830 } else
831 sc->sc_counter++;
832
833 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff);
834 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff);
835
836 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
837
838 /* Tag packet for carp_output */
839 mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct ifnet *), M_NOWAIT);
840 if (mtag == NULL) {
841 m_freem(m);
842 SC2IFP(sc)->if_oerrors++;
843 return (ENOMEM);
844 }
845 bcopy(&ifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *));
846 m_tag_prepend(m, mtag);
847
848 return (0);
849 }
850
851 static void
852 carp_send_ad_all(void)
853 {
854 struct carp_softc *sc;
855
856 mtx_lock(&carp_mtx);
857 LIST_FOREACH(sc, &carpif_list, sc_next) {
858 if (sc->sc_carpdev == NULL)
859 continue;
860 CARP_SCLOCK(sc);
861 if ((SC2IFP(sc)->if_flags & IFF_UP) &&
862 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING) &&
863 sc->sc_state == MASTER)
864 carp_send_ad_locked(sc);
865 CARP_SCUNLOCK(sc);
866 }
867 mtx_unlock(&carp_mtx);
868 }
869
870 static void
871 carp_send_ad(void *v)
872 {
873 struct carp_softc *sc = v;
874
875 CARP_SCLOCK(sc);
876 carp_send_ad_locked(sc);
877 CARP_SCUNLOCK(sc);
878 }
879
880 static void
881 carp_send_ad_locked(struct carp_softc *sc)
882 {
883 struct carp_header ch;
884 struct timeval tv;
885 struct carp_header *ch_ptr;
886 struct mbuf *m;
887 int len, advbase, advskew;
888
889 CARP_SCLOCK_ASSERT(sc);
890
891 /* bow out if we've lost our UPness or RUNNINGuiness */
892 if (!((SC2IFP(sc)->if_flags & IFF_UP) &&
893 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) {
894 advbase = 255;
895 advskew = 255;
896 } else {
897 advbase = sc->sc_advbase;
898 if (!carp_suppress_preempt || sc->sc_advskew > 240)
899 advskew = sc->sc_advskew;
900 else
901 advskew = 240;
902 tv.tv_sec = advbase;
903 tv.tv_usec = advskew * 1000000 / 256;
904 }
905
906 ch.carp_version = CARP_VERSION;
907 ch.carp_type = CARP_ADVERTISEMENT;
908 ch.carp_vhid = sc->sc_vhid;
909 ch.carp_advbase = advbase;
910 ch.carp_advskew = advskew;
911 ch.carp_authlen = 7; /* XXX DEFINE */
912 ch.carp_pad1 = 0; /* must be zero */
913 ch.carp_cksum = 0;
914
915 #ifdef INET
916 if (sc->sc_ia) {
917 struct ip *ip;
918
919 MGETHDR(m, M_DONTWAIT, MT_HEADER);
920 if (m == NULL) {
921 SC2IFP(sc)->if_oerrors++;
922 carpstats.carps_onomem++;
923 /* XXX maybe less ? */
924 if (advbase != 255 || advskew != 255)
925 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
926 carp_send_ad, sc);
927 return;
928 }
929 len = sizeof(*ip) + sizeof(ch);
930 m->m_pkthdr.len = len;
931 m->m_pkthdr.rcvif = NULL;
932 m->m_len = len;
933 MH_ALIGN(m, m->m_len);
934 m->m_flags |= M_MCAST;
935 ip = mtod(m, struct ip *);
936 ip->ip_v = IPVERSION;
937 ip->ip_hl = sizeof(*ip) >> 2;
938 ip->ip_tos = IPTOS_LOWDELAY;
939 ip->ip_len = len;
940 ip->ip_id = ip_newid();
941 ip->ip_off = IP_DF;
942 ip->ip_ttl = CARP_DFLTTL;
943 ip->ip_p = IPPROTO_CARP;
944 ip->ip_sum = 0;
945 ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr;
946 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
947
948 ch_ptr = (struct carp_header *)(&ip[1]);
949 bcopy(&ch, ch_ptr, sizeof(ch));
950 if (carp_prepare_ad(m, sc, ch_ptr))
951 return;
952
953 m->m_data += sizeof(*ip);
954 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip));
955 m->m_data -= sizeof(*ip);
956
957 getmicrotime(&SC2IFP(sc)->if_lastchange);
958 SC2IFP(sc)->if_opackets++;
959 SC2IFP(sc)->if_obytes += len;
960 carpstats.carps_opackets++;
961
962 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) {
963 SC2IFP(sc)->if_oerrors++;
964 if (sc->sc_sendad_errors < INT_MAX)
965 sc->sc_sendad_errors++;
966 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
967 carp_suppress_preempt++;
968 if (carp_suppress_preempt == 1) {
969 CARP_SCUNLOCK(sc);
970 carp_send_ad_all();
971 CARP_SCLOCK(sc);
972 }
973 }
974 sc->sc_sendad_success = 0;
975 } else {
976 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
977 if (++sc->sc_sendad_success >=
978 CARP_SENDAD_MIN_SUCCESS) {
979 carp_suppress_preempt--;
980 sc->sc_sendad_errors = 0;
981 }
982 } else
983 sc->sc_sendad_errors = 0;
984 }
985 }
986 #endif /* INET */
987 #ifdef INET6
988 if (sc->sc_ia6) {
989 struct ip6_hdr *ip6;
990
991 MGETHDR(m, M_DONTWAIT, MT_HEADER);
992 if (m == NULL) {
993 SC2IFP(sc)->if_oerrors++;
994 carpstats.carps_onomem++;
995 /* XXX maybe less ? */
996 if (advbase != 255 || advskew != 255)
997 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
998 carp_send_ad, sc);
999 return;
1000 }
1001 len = sizeof(*ip6) + sizeof(ch);
1002 m->m_pkthdr.len = len;
1003 m->m_pkthdr.rcvif = NULL;
1004 m->m_len = len;
1005 MH_ALIGN(m, m->m_len);
1006 m->m_flags |= M_MCAST;
1007 ip6 = mtod(m, struct ip6_hdr *);
1008 bzero(ip6, sizeof(*ip6));
1009 ip6->ip6_vfc |= IPV6_VERSION;
1010 ip6->ip6_hlim = CARP_DFLTTL;
1011 ip6->ip6_nxt = IPPROTO_CARP;
1012 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src,
1013 sizeof(struct in6_addr));
1014 /* set the multicast destination */
1015
1016 ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
1017 ip6->ip6_dst.s6_addr8[15] = 0x12;
1018 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
1019 SC2IFP(sc)->if_oerrors++;
1020 m_freem(m);
1021 CARP_LOG("%s: in6_setscope failed\n", __func__);
1022 return;
1023 }
1024
1025 ch_ptr = (struct carp_header *)(&ip6[1]);
1026 bcopy(&ch, ch_ptr, sizeof(ch));
1027 if (carp_prepare_ad(m, sc, ch_ptr))
1028 return;
1029
1030 m->m_data += sizeof(*ip6);
1031 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6));
1032 m->m_data -= sizeof(*ip6);
1033
1034 getmicrotime(&SC2IFP(sc)->if_lastchange);
1035 SC2IFP(sc)->if_opackets++;
1036 SC2IFP(sc)->if_obytes += len;
1037 carpstats.carps_opackets6++;
1038
1039 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) {
1040 SC2IFP(sc)->if_oerrors++;
1041 if (sc->sc_sendad_errors < INT_MAX)
1042 sc->sc_sendad_errors++;
1043 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1044 carp_suppress_preempt++;
1045 if (carp_suppress_preempt == 1) {
1046 CARP_SCUNLOCK(sc);
1047 carp_send_ad_all();
1048 CARP_SCLOCK(sc);
1049 }
1050 }
1051 sc->sc_sendad_success = 0;
1052 } else {
1053 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1054 if (++sc->sc_sendad_success >=
1055 CARP_SENDAD_MIN_SUCCESS) {
1056 carp_suppress_preempt--;
1057 sc->sc_sendad_errors = 0;
1058 }
1059 } else
1060 sc->sc_sendad_errors = 0;
1061 }
1062 }
1063 #endif /* INET6 */
1064
1065 if (advbase != 255 || advskew != 255)
1066 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1067 carp_send_ad, sc);
1068
1069 }
1070
1071 /*
1072 * Broadcast a gratuitous ARP request containing
1073 * the virtual router MAC address for each IP address
1074 * associated with the virtual router.
1075 */
1076 static void
1077 carp_send_arp(struct carp_softc *sc)
1078 {
1079 struct ifaddr *ifa;
1080
1081 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1082
1083 if (ifa->ifa_addr->sa_family != AF_INET)
1084 continue;
1085
1086 /* arprequest(sc->sc_carpdev, &in, &in, IF_LLADDR(sc->sc_ifp)); */
1087 arp_ifinit2(sc->sc_carpdev, ifa, IF_LLADDR(sc->sc_ifp));
1088
1089 DELAY(1000); /* XXX */
1090 }
1091 }
1092
1093 #ifdef INET6
1094 static void
1095 carp_send_na(struct carp_softc *sc)
1096 {
1097 struct ifaddr *ifa;
1098 struct in6_addr *in6;
1099 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1100
1101 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1102
1103 if (ifa->ifa_addr->sa_family != AF_INET6)
1104 continue;
1105
1106 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
1107 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1108 ND_NA_FLAG_OVERRIDE, 1, NULL);
1109 DELAY(1000); /* XXX */
1110 }
1111 }
1112 #endif /* INET6 */
1113
1114 static int
1115 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type)
1116 {
1117 struct carp_softc *vh;
1118 struct ifaddr *ifa;
1119 int count = 0;
1120
1121 CARP_LOCK_ASSERT(cif);
1122
1123 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1124 if ((type == CARP_COUNT_RUNNING &&
1125 (SC2IFP(vh)->if_flags & IFF_UP) &&
1126 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) ||
1127 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) {
1128 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist,
1129 ifa_list) {
1130 if (ifa->ifa_addr->sa_family == AF_INET &&
1131 ia->ia_addr.sin_addr.s_addr ==
1132 ifatoia(ifa)->ia_addr.sin_addr.s_addr)
1133 count++;
1134 }
1135 }
1136 }
1137 return (count);
1138 }
1139
1140 int
1141 carp_iamatch(void *v, struct in_ifaddr *ia,
1142 struct in_addr *isaddr, u_int8_t **enaddr)
1143 {
1144 struct carp_if *cif = v;
1145 struct carp_softc *vh;
1146 int index, count = 0;
1147 struct ifaddr *ifa;
1148
1149 CARP_LOCK(cif);
1150
1151 if (carp_opts[CARPCTL_ARPBALANCE]) {
1152 /*
1153 * XXX proof of concept implementation.
1154 * We use the source ip to decide which virtual host should
1155 * handle the request. If we're master of that virtual host,
1156 * then we respond, otherwise, just drop the arp packet on
1157 * the floor.
1158 */
1159 count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING);
1160 if (count == 0) {
1161 /* should never reach this */
1162 CARP_UNLOCK(cif);
1163 return (0);
1164 }
1165
1166 /* this should be a hash, like pf_hash() */
1167 index = ntohl(isaddr->s_addr) % count;
1168 count = 0;
1169
1170 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1171 if ((SC2IFP(vh)->if_flags & IFF_UP) &&
1172 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) {
1173 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist,
1174 ifa_list) {
1175 if (ifa->ifa_addr->sa_family ==
1176 AF_INET &&
1177 ia->ia_addr.sin_addr.s_addr ==
1178 ifatoia(ifa)->ia_addr.sin_addr.s_addr) {
1179 if (count == index) {
1180 if (vh->sc_state ==
1181 MASTER) {
1182 *enaddr = IF_LLADDR(vh->sc_ifp);
1183 CARP_UNLOCK(cif);
1184 return (1);
1185 } else {
1186 CARP_UNLOCK(cif);
1187 return (0);
1188 }
1189 }
1190 count++;
1191 }
1192 }
1193 }
1194 }
1195 } else {
1196 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1197 if ((SC2IFP(vh)->if_flags & IFF_UP) &&
1198 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
1199 ia->ia_ifp == SC2IFP(vh) &&
1200 vh->sc_state == MASTER) {
1201 *enaddr = IF_LLADDR(vh->sc_ifp);
1202 CARP_UNLOCK(cif);
1203 return (1);
1204 }
1205 }
1206 }
1207 CARP_UNLOCK(cif);
1208 return (0);
1209 }
1210
1211 #ifdef INET6
1212 struct ifaddr *
1213 carp_iamatch6(void *v, struct in6_addr *taddr)
1214 {
1215 struct carp_if *cif = v;
1216 struct carp_softc *vh;
1217 struct ifaddr *ifa;
1218
1219 CARP_LOCK(cif);
1220 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1221 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, ifa_list) {
1222 if (IN6_ARE_ADDR_EQUAL(taddr,
1223 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1224 (SC2IFP(vh)->if_flags & IFF_UP) &&
1225 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
1226 vh->sc_state == MASTER) {
1227 CARP_UNLOCK(cif);
1228 return (ifa);
1229 }
1230 }
1231 }
1232 CARP_UNLOCK(cif);
1233
1234 return (NULL);
1235 }
1236
1237 void *
1238 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr)
1239 {
1240 struct m_tag *mtag;
1241 struct carp_if *cif = v;
1242 struct carp_softc *sc;
1243 struct ifaddr *ifa;
1244
1245 CARP_LOCK(cif);
1246 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
1247 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1248 if (IN6_ARE_ADDR_EQUAL(taddr,
1249 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1250 (SC2IFP(sc)->if_flags & IFF_UP) &&
1251 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING)) {
1252 struct ifnet *ifp = SC2IFP(sc);
1253 mtag = m_tag_get(PACKET_TAG_CARP,
1254 sizeof(struct ifnet *), M_NOWAIT);
1255 if (mtag == NULL) {
1256 /* better a bit than nothing */
1257 CARP_UNLOCK(cif);
1258 return (IF_LLADDR(sc->sc_ifp));
1259 }
1260 bcopy(&ifp, (caddr_t)(mtag + 1),
1261 sizeof(struct ifnet *));
1262 m_tag_prepend(m, mtag);
1263
1264 CARP_UNLOCK(cif);
1265 return (IF_LLADDR(sc->sc_ifp));
1266 }
1267 }
1268 }
1269 CARP_UNLOCK(cif);
1270
1271 return (NULL);
1272 }
1273 #endif
1274
1275 struct ifnet *
1276 carp_forus(void *v, void *dhost)
1277 {
1278 struct carp_if *cif = v;
1279 struct carp_softc *vh;
1280 u_int8_t *ena = dhost;
1281
1282 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
1283 return (NULL);
1284
1285 CARP_LOCK(cif);
1286 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list)
1287 if ((SC2IFP(vh)->if_flags & IFF_UP) &&
1288 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
1289 vh->sc_state == MASTER &&
1290 !bcmp(dhost, IF_LLADDR(vh->sc_ifp), ETHER_ADDR_LEN)) {
1291 CARP_UNLOCK(cif);
1292 return (SC2IFP(vh));
1293 }
1294
1295 CARP_UNLOCK(cif);
1296 return (NULL);
1297 }
1298
1299 static void
1300 carp_master_down(void *v)
1301 {
1302 struct carp_softc *sc = v;
1303
1304 CARP_SCLOCK(sc);
1305 carp_master_down_locked(sc);
1306 CARP_SCUNLOCK(sc);
1307 }
1308
1309 static void
1310 carp_master_down_locked(struct carp_softc *sc)
1311 {
1312 if (sc->sc_carpdev)
1313 CARP_SCLOCK_ASSERT(sc);
1314
1315 switch (sc->sc_state) {
1316 case INIT:
1317 printf("%s: master_down event in INIT state\n",
1318 SC2IFP(sc)->if_xname);
1319 break;
1320 case MASTER:
1321 break;
1322 case BACKUP:
1323 carp_set_state(sc, MASTER);
1324 carp_send_ad_locked(sc);
1325 carp_send_arp(sc);
1326 #ifdef INET6
1327 carp_send_na(sc);
1328 #endif /* INET6 */
1329 carp_setrun(sc, 0);
1330 carp_setroute(sc, RTM_ADD);
1331 break;
1332 }
1333 }
1334
1335 /*
1336 * When in backup state, af indicates whether to reset the master down timer
1337 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1338 */
1339 static void
1340 carp_setrun(struct carp_softc *sc, sa_family_t af)
1341 {
1342 struct timeval tv;
1343
1344 if (sc->sc_carpdev == NULL) {
1345 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1346 carp_set_state(sc, INIT);
1347 return;
1348 } else
1349 CARP_SCLOCK_ASSERT(sc);
1350
1351 if (SC2IFP(sc)->if_flags & IFF_UP &&
1352 sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6) &&
1353 sc->sc_carpdev->if_link_state == LINK_STATE_UP)
1354 SC2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING;
1355 else {
1356 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1357 carp_setroute(sc, RTM_DELETE);
1358 return;
1359 }
1360
1361 switch (sc->sc_state) {
1362 case INIT:
1363 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) {
1364 carp_send_ad_locked(sc);
1365 carp_send_arp(sc);
1366 #ifdef INET6
1367 carp_send_na(sc);
1368 #endif /* INET6 */
1369 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n",
1370 SC2IFP(sc)->if_xname);
1371 carp_set_state(sc, MASTER);
1372 carp_setroute(sc, RTM_ADD);
1373 } else {
1374 CARP_DEBUG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname);
1375 carp_set_state(sc, BACKUP);
1376 carp_setroute(sc, RTM_DELETE);
1377 carp_setrun(sc, 0);
1378 }
1379 break;
1380 case BACKUP:
1381 callout_stop(&sc->sc_ad_tmo);
1382 tv.tv_sec = 3 * sc->sc_advbase;
1383 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1384 switch (af) {
1385 #ifdef INET
1386 case AF_INET:
1387 callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
1388 carp_master_down, sc);
1389 break;
1390 #endif /* INET */
1391 #ifdef INET6
1392 case AF_INET6:
1393 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
1394 carp_master_down, sc);
1395 break;
1396 #endif /* INET6 */
1397 default:
1398 if (sc->sc_naddrs)
1399 callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
1400 carp_master_down, sc);
1401 if (sc->sc_naddrs6)
1402 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
1403 carp_master_down, sc);
1404 break;
1405 }
1406 break;
1407 case MASTER:
1408 tv.tv_sec = sc->sc_advbase;
1409 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1410 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1411 carp_send_ad, sc);
1412 break;
1413 }
1414 }
1415
1416 static void
1417 carp_multicast_cleanup(struct carp_softc *sc)
1418 {
1419 struct ip_moptions *imo = &sc->sc_imo;
1420 u_int16_t n = imo->imo_num_memberships;
1421
1422 /* Clean up our own multicast memberships */
1423 while (n-- > 0) {
1424 if (imo->imo_membership[n] != NULL) {
1425 in_delmulti(imo->imo_membership[n]);
1426 imo->imo_membership[n] = NULL;
1427 }
1428 }
1429 KASSERT(imo->imo_mfilters == NULL,
1430 ("%s: imo_mfilters != NULL", __func__));
1431 imo->imo_num_memberships = 0;
1432 imo->imo_multicast_ifp = NULL;
1433 }
1434
1435 #ifdef INET6
1436 static void
1437 carp_multicast6_cleanup(struct carp_softc *sc)
1438 {
1439 struct ip6_moptions *im6o = &sc->sc_im6o;
1440
1441 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1442 struct in6_multi_mship *imm =
1443 LIST_FIRST(&im6o->im6o_memberships);
1444
1445 LIST_REMOVE(imm, i6mm_chain);
1446 in6_leavegroup(imm);
1447 }
1448 im6o->im6o_multicast_ifp = NULL;
1449 }
1450 #endif
1451
1452 static int
1453 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1454 {
1455 struct ifnet *ifp;
1456 struct carp_if *cif;
1457 struct in_ifaddr *ia, *ia_if;
1458 struct ip_moptions *imo = &sc->sc_imo;
1459 struct in_addr addr;
1460 u_long iaddr = htonl(sin->sin_addr.s_addr);
1461 int own, error;
1462
1463 if (sin->sin_addr.s_addr == 0) {
1464 if (!(SC2IFP(sc)->if_flags & IFF_UP))
1465 carp_set_state(sc, INIT);
1466 if (sc->sc_naddrs)
1467 SC2IFP(sc)->if_flags |= IFF_UP;
1468 if (sc->sc_carpdev)
1469 CARP_SCLOCK(sc);
1470 carp_setrun(sc, 0);
1471 if (sc->sc_carpdev)
1472 CARP_SCUNLOCK(sc);
1473 return (0);
1474 }
1475
1476 /* we have to do it by hands to check we won't match on us */
1477 ia_if = NULL; own = 0;
1478 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
1479 /* and, yeah, we need a multicast-capable iface too */
1480 if (ia->ia_ifp != SC2IFP(sc) &&
1481 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1482 (iaddr & ia->ia_subnetmask) == ia->ia_subnet) {
1483 if (!ia_if)
1484 ia_if = ia;
1485 if (sin->sin_addr.s_addr ==
1486 ia->ia_addr.sin_addr.s_addr)
1487 own++;
1488 }
1489 }
1490
1491 if (!ia_if)
1492 return (EADDRNOTAVAIL);
1493
1494 ia = ia_if;
1495 ifp = ia->ia_ifp;
1496
1497 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1498 (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp))
1499 return (EADDRNOTAVAIL);
1500
1501 if (imo->imo_num_memberships == 0) {
1502 addr.s_addr = htonl(INADDR_CARP_GROUP);
1503 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL)
1504 return (ENOBUFS);
1505 imo->imo_num_memberships++;
1506 imo->imo_multicast_ifp = ifp;
1507 imo->imo_multicast_ttl = CARP_DFLTTL;
1508 imo->imo_multicast_loop = 0;
1509 }
1510
1511 if (!ifp->if_carp) {
1512
1513 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP,
1514 M_WAITOK|M_ZERO);
1515 if (!cif) {
1516 error = ENOBUFS;
1517 goto cleanup;
1518 }
1519 if ((error = ifpromisc(ifp, 1))) {
1520 FREE(cif, M_CARP);
1521 goto cleanup;
1522 }
1523
1524 CARP_LOCK_INIT(cif);
1525 CARP_LOCK(cif);
1526 cif->vhif_ifp = ifp;
1527 TAILQ_INIT(&cif->vhif_vrs);
1528 ifp->if_carp = cif;
1529
1530 } else {
1531 struct carp_softc *vr;
1532
1533 cif = (struct carp_if *)ifp->if_carp;
1534 CARP_LOCK(cif);
1535 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1536 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1537 CARP_UNLOCK(cif);
1538 error = EEXIST;
1539 goto cleanup;
1540 }
1541 }
1542 sc->sc_ia = ia;
1543 sc->sc_carpdev = ifp;
1544
1545 { /* XXX prevent endless loop if already in queue */
1546 struct carp_softc *vr, *after = NULL;
1547 int myself = 0;
1548 cif = (struct carp_if *)ifp->if_carp;
1549
1550 /* XXX: cif should not change, right? So we still hold the lock */
1551 CARP_LOCK_ASSERT(cif);
1552
1553 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1554 if (vr == sc)
1555 myself = 1;
1556 if (vr->sc_vhid < sc->sc_vhid)
1557 after = vr;
1558 }
1559
1560 if (!myself) {
1561 /* We're trying to keep things in order */
1562 if (after == NULL) {
1563 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1564 } else {
1565 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1566 }
1567 cif->vhif_nvrs++;
1568 }
1569 }
1570
1571 sc->sc_naddrs++;
1572 SC2IFP(sc)->if_flags |= IFF_UP;
1573 if (own)
1574 sc->sc_advskew = 0;
1575 carp_sc_state_locked(sc);
1576 carp_setrun(sc, 0);
1577
1578 CARP_UNLOCK(cif);
1579
1580 return (0);
1581
1582 cleanup:
1583 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1584 return (error);
1585 }
1586
1587 static int
1588 carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1589 {
1590 int error = 0;
1591
1592 if (!--sc->sc_naddrs) {
1593 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1594 struct ip_moptions *imo = &sc->sc_imo;
1595
1596 CARP_LOCK(cif);
1597 callout_stop(&sc->sc_ad_tmo);
1598 SC2IFP(sc)->if_flags &= ~IFF_UP;
1599 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1600 sc->sc_vhid = -1;
1601 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1602 imo->imo_multicast_ifp = NULL;
1603 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1604 if (!--cif->vhif_nvrs) {
1605 sc->sc_carpdev->if_carp = NULL;
1606 CARP_LOCK_DESTROY(cif);
1607 FREE(cif, M_IFADDR);
1608 } else {
1609 CARP_UNLOCK(cif);
1610 }
1611 }
1612
1613 return (error);
1614 }
1615
1616 #ifdef INET6
1617 static int
1618 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1619 {
1620 struct ifnet *ifp;
1621 struct carp_if *cif;
1622 struct in6_ifaddr *ia, *ia_if;
1623 struct ip6_moptions *im6o = &sc->sc_im6o;
1624 struct in6_multi_mship *imm;
1625 struct in6_addr in6;
1626 int own, error;
1627
1628 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1629 if (!(SC2IFP(sc)->if_flags & IFF_UP))
1630 carp_set_state(sc, INIT);
1631 if (sc->sc_naddrs6)
1632 SC2IFP(sc)->if_flags |= IFF_UP;
1633 if (sc->sc_carpdev)
1634 CARP_SCLOCK(sc);
1635 carp_setrun(sc, 0);
1636 if (sc->sc_carpdev)
1637 CARP_SCUNLOCK(sc);
1638 return (0);
1639 }
1640
1641 /* we have to do it by hands to check we won't match on us */
1642 ia_if = NULL; own = 0;
1643 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1644 int i;
1645
1646 for (i = 0; i < 4; i++) {
1647 if ((sin6->sin6_addr.s6_addr32[i] &
1648 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
1649 (ia->ia_addr.sin6_addr.s6_addr32[i] &
1650 ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
1651 break;
1652 }
1653 /* and, yeah, we need a multicast-capable iface too */
1654 if (ia->ia_ifp != SC2IFP(sc) &&
1655 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1656 (i == 4)) {
1657 if (!ia_if)
1658 ia_if = ia;
1659 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
1660 &ia->ia_addr.sin6_addr))
1661 own++;
1662 }
1663 }
1664
1665 if (!ia_if)
1666 return (EADDRNOTAVAIL);
1667 ia = ia_if;
1668 ifp = ia->ia_ifp;
1669
1670 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1671 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp))
1672 return (EADDRNOTAVAIL);
1673
1674 if (!sc->sc_naddrs6) {
1675 im6o->im6o_multicast_ifp = ifp;
1676
1677 /* join CARP multicast address */
1678 bzero(&in6, sizeof(in6));
1679 in6.s6_addr16[0] = htons(0xff02);
1680 in6.s6_addr8[15] = 0x12;
1681 if (in6_setscope(&in6, ifp, NULL) != 0)
1682 goto cleanup;
1683 if ((imm = in6_joingroup(ifp, &in6, &error, 0)) == NULL)
1684 goto cleanup;
1685 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1686
1687 /* join solicited multicast address */
1688 bzero(&in6, sizeof(in6));
1689 in6.s6_addr16[0] = htons(0xff02);
1690 in6.s6_addr32[1] = 0;
1691 in6.s6_addr32[2] = htonl(1);
1692 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3];
1693 in6.s6_addr8[12] = 0xff;
1694 if (in6_setscope(&in6, ifp, NULL) != 0)
1695 goto cleanup;
1696 if ((imm = in6_joingroup(ifp, &in6, &error, 0)) == NULL)
1697 goto cleanup;
1698 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1699 }
1700
1701 if (!ifp->if_carp) {
1702 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP,
1703 M_WAITOK|M_ZERO);
1704 if (!cif) {
1705 error = ENOBUFS;
1706 goto cleanup;
1707 }
1708 if ((error = ifpromisc(ifp, 1))) {
1709 FREE(cif, M_CARP);
1710 goto cleanup;
1711 }
1712
1713 CARP_LOCK_INIT(cif);
1714 CARP_LOCK(cif);
1715 cif->vhif_ifp = ifp;
1716 TAILQ_INIT(&cif->vhif_vrs);
1717 ifp->if_carp = cif;
1718
1719 } else {
1720 struct carp_softc *vr;
1721
1722 cif = (struct carp_if *)ifp->if_carp;
1723 CARP_LOCK(cif);
1724 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1725 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1726 CARP_UNLOCK(cif);
1727 error = EINVAL;
1728 goto cleanup;
1729 }
1730 }
1731 sc->sc_ia6 = ia;
1732 sc->sc_carpdev = ifp;
1733
1734 { /* XXX prevent endless loop if already in queue */
1735 struct carp_softc *vr, *after = NULL;
1736 int myself = 0;
1737 cif = (struct carp_if *)ifp->if_carp;
1738 CARP_LOCK_ASSERT(cif);
1739
1740 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1741 if (vr == sc)
1742 myself = 1;
1743 if (vr->sc_vhid < sc->sc_vhid)
1744 after = vr;
1745 }
1746
1747 if (!myself) {
1748 /* We're trying to keep things in order */
1749 if (after == NULL) {
1750 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1751 } else {
1752 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1753 }
1754 cif->vhif_nvrs++;
1755 }
1756 }
1757
1758 sc->sc_naddrs6++;
1759 SC2IFP(sc)->if_flags |= IFF_UP;
1760 if (own)
1761 sc->sc_advskew = 0;
1762 carp_sc_state_locked(sc);
1763 carp_setrun(sc, 0);
1764
1765 CARP_UNLOCK(cif);
1766
1767 return (0);
1768
1769 cleanup:
1770 /* clean up multicast memberships */
1771 if (!sc->sc_naddrs6) {
1772 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1773 imm = LIST_FIRST(&im6o->im6o_memberships);
1774 LIST_REMOVE(imm, i6mm_chain);
1775 in6_leavegroup(imm);
1776 }
1777 }
1778 return (error);
1779 }
1780
1781 static int
1782 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1783 {
1784 int error = 0;
1785
1786 if (!--sc->sc_naddrs6) {
1787 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1788 struct ip6_moptions *im6o = &sc->sc_im6o;
1789
1790 CARP_LOCK(cif);
1791 callout_stop(&sc->sc_ad_tmo);
1792 SC2IFP(sc)->if_flags &= ~IFF_UP;
1793 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1794 sc->sc_vhid = -1;
1795 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1796 struct in6_multi_mship *imm =
1797 LIST_FIRST(&im6o->im6o_memberships);
1798
1799 LIST_REMOVE(imm, i6mm_chain);
1800 in6_leavegroup(imm);
1801 }
1802 im6o->im6o_multicast_ifp = NULL;
1803 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1804 if (!--cif->vhif_nvrs) {
1805 CARP_LOCK_DESTROY(cif);
1806 sc->sc_carpdev->if_carp = NULL;
1807 FREE(cif, M_IFADDR);
1808 } else
1809 CARP_UNLOCK(cif);
1810 }
1811
1812 return (error);
1813 }
1814 #endif /* INET6 */
1815
1816 static int
1817 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr)
1818 {
1819 struct carp_softc *sc = ifp->if_softc, *vr;
1820 struct carpreq carpr;
1821 struct ifaddr *ifa;
1822 struct ifreq *ifr;
1823 struct ifaliasreq *ifra;
1824 int locked = 0, error = 0;
1825
1826 ifa = (struct ifaddr *)addr;
1827 ifra = (struct ifaliasreq *)addr;
1828 ifr = (struct ifreq *)addr;
1829
1830 switch (cmd) {
1831 case SIOCSIFADDR:
1832 switch (ifa->ifa_addr->sa_family) {
1833 #ifdef INET
1834 case AF_INET:
1835 SC2IFP(sc)->if_flags |= IFF_UP;
1836 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1837 sizeof(struct sockaddr));
1838 error = carp_set_addr(sc, satosin(ifa->ifa_addr));
1839 break;
1840 #endif /* INET */
1841 #ifdef INET6
1842 case AF_INET6:
1843 SC2IFP(sc)->if_flags |= IFF_UP;
1844 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr));
1845 break;
1846 #endif /* INET6 */
1847 default:
1848 error = EAFNOSUPPORT;
1849 break;
1850 }
1851 break;
1852
1853 case SIOCAIFADDR:
1854 switch (ifa->ifa_addr->sa_family) {
1855 #ifdef INET
1856 case AF_INET:
1857 SC2IFP(sc)->if_flags |= IFF_UP;
1858 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1859 sizeof(struct sockaddr));
1860 error = carp_set_addr(sc, satosin(&ifra->ifra_addr));
1861 break;
1862 #endif /* INET */
1863 #ifdef INET6
1864 case AF_INET6:
1865 SC2IFP(sc)->if_flags |= IFF_UP;
1866 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr));
1867 break;
1868 #endif /* INET6 */
1869 default:
1870 error = EAFNOSUPPORT;
1871 break;
1872 }
1873 break;
1874
1875 case SIOCDIFADDR:
1876 switch (ifa->ifa_addr->sa_family) {
1877 #ifdef INET
1878 case AF_INET:
1879 error = carp_del_addr(sc, satosin(&ifra->ifra_addr));
1880 break;
1881 #endif /* INET */
1882 #ifdef INET6
1883 case AF_INET6:
1884 error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr));
1885 break;
1886 #endif /* INET6 */
1887 default:
1888 error = EAFNOSUPPORT;
1889 break;
1890 }
1891 break;
1892
1893 case SIOCSIFFLAGS:
1894 if (sc->sc_carpdev) {
1895 locked = 1;
1896 CARP_SCLOCK(sc);
1897 }
1898 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) {
1899 callout_stop(&sc->sc_ad_tmo);
1900 callout_stop(&sc->sc_md_tmo);
1901 callout_stop(&sc->sc_md6_tmo);
1902 if (sc->sc_state == MASTER)
1903 carp_send_ad_locked(sc);
1904 carp_set_state(sc, INIT);
1905 carp_setrun(sc, 0);
1906 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) {
1907 SC2IFP(sc)->if_flags |= IFF_UP;
1908 carp_setrun(sc, 0);
1909 }
1910 break;
1911
1912 case SIOCSVH:
1913 error = priv_check(curthread, PRIV_NETINET_CARP);
1914 if (error)
1915 break;
1916 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr)))
1917 break;
1918 error = 1;
1919 if (sc->sc_carpdev) {
1920 locked = 1;
1921 CARP_SCLOCK(sc);
1922 }
1923 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) {
1924 switch (carpr.carpr_state) {
1925 case BACKUP:
1926 callout_stop(&sc->sc_ad_tmo);
1927 carp_set_state(sc, BACKUP);
1928 carp_setrun(sc, 0);
1929 carp_setroute(sc, RTM_DELETE);
1930 break;
1931 case MASTER:
1932 carp_master_down_locked(sc);
1933 break;
1934 default:
1935 break;
1936 }
1937 }
1938 if (carpr.carpr_vhid > 0) {
1939 if (carpr.carpr_vhid > 255) {
1940 error = EINVAL;
1941 break;
1942 }
1943 if (sc->sc_carpdev) {
1944 struct carp_if *cif;
1945 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1946 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1947 if (vr != sc &&
1948 vr->sc_vhid == carpr.carpr_vhid) {
1949 error = EEXIST;
1950 break;
1951 }
1952 if (error == EEXIST)
1953 break;
1954 }
1955 sc->sc_vhid = carpr.carpr_vhid;
1956 IF_LLADDR(sc->sc_ifp)[0] = 0;
1957 IF_LLADDR(sc->sc_ifp)[1] = 0;
1958 IF_LLADDR(sc->sc_ifp)[2] = 0x5e;
1959 IF_LLADDR(sc->sc_ifp)[3] = 0;
1960 IF_LLADDR(sc->sc_ifp)[4] = 1;
1961 IF_LLADDR(sc->sc_ifp)[5] = sc->sc_vhid;
1962 error--;
1963 }
1964 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) {
1965 if (carpr.carpr_advskew >= 255) {
1966 error = EINVAL;
1967 break;
1968 }
1969 if (carpr.carpr_advbase > 255) {
1970 error = EINVAL;
1971 break;
1972 }
1973 sc->sc_advbase = carpr.carpr_advbase;
1974 sc->sc_advskew = carpr.carpr_advskew;
1975 error--;
1976 }
1977 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key));
1978 if (error > 0)
1979 error = EINVAL;
1980 else {
1981 error = 0;
1982 carp_setrun(sc, 0);
1983 }
1984 break;
1985
1986 case SIOCGVH:
1987 /* XXX: lockless read */
1988 bzero(&carpr, sizeof(carpr));
1989 carpr.carpr_state = sc->sc_state;
1990 carpr.carpr_vhid = sc->sc_vhid;
1991 carpr.carpr_advbase = sc->sc_advbase;
1992 carpr.carpr_advskew = sc->sc_advskew;
1993 error = priv_check(curthread, PRIV_NETINET_CARP);
1994 if (error == 0)
1995 bcopy(sc->sc_key, carpr.carpr_key,
1996 sizeof(carpr.carpr_key));
1997 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
1998 break;
1999
2000 default:
2001 error = EINVAL;
2002 }
2003
2004 if (locked)
2005 CARP_SCUNLOCK(sc);
2006
2007 carp_hmac_prepare(sc);
2008
2009 return (error);
2010 }
2011
2012 /*
2013 * XXX: this is looutput. We should eventually use it from there.
2014 */
2015 static int
2016 carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
2017 struct rtentry *rt)
2018 {
2019 u_int32_t af;
2020
2021 M_ASSERTPKTHDR(m); /* check if we have the packet header */
2022
2023 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
2024 m_freem(m);
2025 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
2026 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
2027 }
2028
2029 ifp->if_opackets++;
2030 ifp->if_obytes += m->m_pkthdr.len;
2031
2032 /* BPF writes need to be handled specially. */
2033 if (dst->sa_family == AF_UNSPEC) {
2034 bcopy(dst->sa_data, &af, sizeof(af));
2035 dst->sa_family = af;
2036 }
2037
2038 #if 1 /* XXX */
2039 switch (dst->sa_family) {
2040 case AF_INET:
2041 case AF_INET6:
2042 case AF_IPX:
2043 case AF_APPLETALK:
2044 break;
2045 default:
2046 printf("carp_looutput: af=%d unexpected\n", dst->sa_family);
2047 m_freem(m);
2048 return (EAFNOSUPPORT);
2049 }
2050 #endif
2051 return(if_simloop(ifp, m, dst->sa_family, 0));
2052 }
2053
2054 /*
2055 * Start output on carp interface. This function should never be called.
2056 */
2057 static void
2058 carp_start(struct ifnet *ifp)
2059 {
2060 #ifdef DEBUG
2061 printf("%s: start called\n", ifp->if_xname);
2062 #endif
2063 }
2064
2065 int
2066 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
2067 struct rtentry *rt)
2068 {
2069 struct m_tag *mtag;
2070 struct carp_softc *sc;
2071 struct ifnet *carp_ifp;
2072
2073 if (!sa)
2074 return (0);
2075
2076 switch (sa->sa_family) {
2077 #ifdef INET
2078 case AF_INET:
2079 break;
2080 #endif /* INET */
2081 #ifdef INET6
2082 case AF_INET6:
2083 break;
2084 #endif /* INET6 */
2085 default:
2086 return (0);
2087 }
2088
2089 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL);
2090 if (mtag == NULL)
2091 return (0);
2092
2093 bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *));
2094 sc = carp_ifp->if_softc;
2095
2096 /* Set the source MAC address to Virtual Router MAC Address */
2097 switch (ifp->if_type) {
2098 case IFT_ETHER:
2099 case IFT_L2VLAN: {
2100 struct ether_header *eh;
2101
2102 eh = mtod(m, struct ether_header *);
2103 eh->ether_shost[0] = 0;
2104 eh->ether_shost[1] = 0;
2105 eh->ether_shost[2] = 0x5e;
2106 eh->ether_shost[3] = 0;
2107 eh->ether_shost[4] = 1;
2108 eh->ether_shost[5] = sc->sc_vhid;
2109 }
2110 break;
2111 case IFT_FDDI: {
2112 struct fddi_header *fh;
2113
2114 fh = mtod(m, struct fddi_header *);
2115 fh->fddi_shost[0] = 0;
2116 fh->fddi_shost[1] = 0;
2117 fh->fddi_shost[2] = 0x5e;
2118 fh->fddi_shost[3] = 0;
2119 fh->fddi_shost[4] = 1;
2120 fh->fddi_shost[5] = sc->sc_vhid;
2121 }
2122 break;
2123 case IFT_ISO88025: {
2124 struct iso88025_header *th;
2125 th = mtod(m, struct iso88025_header *);
2126 th->iso88025_shost[0] = 3;
2127 th->iso88025_shost[1] = 0;
2128 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1);
2129 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1);
2130 th->iso88025_shost[4] = 0;
2131 th->iso88025_shost[5] = 0;
2132 }
2133 break;
2134 default:
2135 printf("%s: carp is not supported for this interface type\n",
2136 ifp->if_xname);
2137 return (EOPNOTSUPP);
2138 }
2139
2140 return (0);
2141 }
2142
2143 static void
2144 carp_set_state(struct carp_softc *sc, int state)
2145 {
2146
2147 if (sc->sc_carpdev)
2148 CARP_SCLOCK_ASSERT(sc);
2149
2150 if (sc->sc_state == state)
2151 return;
2152
2153 sc->sc_state = state;
2154 switch (state) {
2155 case BACKUP:
2156 SC2IFP(sc)->if_link_state = LINK_STATE_DOWN;
2157 break;
2158 case MASTER:
2159 SC2IFP(sc)->if_link_state = LINK_STATE_UP;
2160 break;
2161 default:
2162 SC2IFP(sc)->if_link_state = LINK_STATE_UNKNOWN;
2163 break;
2164 }
2165 rt_ifmsg(SC2IFP(sc));
2166 }
2167
2168 void
2169 carp_carpdev_state(void *v)
2170 {
2171 struct carp_if *cif = v;
2172
2173 CARP_LOCK(cif);
2174 carp_carpdev_state_locked(cif);
2175 CARP_UNLOCK(cif);
2176 }
2177
2178 static void
2179 carp_carpdev_state_locked(struct carp_if *cif)
2180 {
2181 struct carp_softc *sc;
2182
2183 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
2184 carp_sc_state_locked(sc);
2185 }
2186
2187 static void
2188 carp_sc_state_locked(struct carp_softc *sc)
2189 {
2190 CARP_SCLOCK_ASSERT(sc);
2191
2192 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP ||
2193 !(sc->sc_carpdev->if_flags & IFF_UP)) {
2194 sc->sc_flags_backup = SC2IFP(sc)->if_flags;
2195 SC2IFP(sc)->if_flags &= ~IFF_UP;
2196 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
2197 callout_stop(&sc->sc_ad_tmo);
2198 callout_stop(&sc->sc_md_tmo);
2199 callout_stop(&sc->sc_md6_tmo);
2200 carp_set_state(sc, INIT);
2201 carp_setrun(sc, 0);
2202 if (!sc->sc_suppress) {
2203 carp_suppress_preempt++;
2204 if (carp_suppress_preempt == 1) {
2205 CARP_SCUNLOCK(sc);
2206 carp_send_ad_all();
2207 CARP_SCLOCK(sc);
2208 }
2209 }
2210 sc->sc_suppress = 1;
2211 } else {
2212 SC2IFP(sc)->if_flags |= sc->sc_flags_backup;
2213 carp_set_state(sc, INIT);
2214 carp_setrun(sc, 0);
2215 if (sc->sc_suppress)
2216 carp_suppress_preempt--;
2217 sc->sc_suppress = 0;
2218 }
2219
2220 return;
2221 }
2222
2223 static int
2224 carp_modevent(module_t mod, int type, void *data)
2225 {
2226 switch (type) {
2227 case MOD_LOAD:
2228 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
2229 carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY);
2230 if (if_detach_event_tag == NULL)
2231 return (ENOMEM);
2232 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF);
2233 LIST_INIT(&carpif_list);
2234 if_clone_attach(&carp_cloner);
2235 break;
2236
2237 case MOD_UNLOAD:
2238 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag);
2239 if_clone_detach(&carp_cloner);
2240 mtx_destroy(&carp_mtx);
2241 break;
2242
2243 default:
2244 return (EINVAL);
2245 }
2246
2247 return (0);
2248 }
2249
2250 static moduledata_t carp_mod = {
2251 "carp",
2252 carp_modevent,
2253 0
2254 };
2255
2256 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
Cache object: e850530c87c1018fa18e346b67d278d0
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