FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_carp.c
1 /* $FreeBSD: releng/5.4/sys/netinet/ip_carp.c 145335 2005-04-20 19:11:07Z cvs2svn $ */
2
3 /*
4 * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
5 * Copyright (c) 2003 Ryan McBride. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
25 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
26 * THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "opt_carp.h"
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/proc.h>
45 #include <sys/sysctl.h>
46 #include <sys/syslog.h>
47 #include <sys/signalvar.h>
48 #include <sys/filio.h>
49 #include <sys/sockio.h>
50
51 #include <sys/socket.h>
52 #include <sys/vnode.h>
53
54 #include <machine/stdarg.h>
55
56 #include <net/bpf.h>
57 #include <net/ethernet.h>
58 #include <net/fddi.h>
59 #include <net/iso88025.h>
60 #include <net/if.h>
61 #include <net/if_clone.h>
62 #include <net/if_types.h>
63 #include <net/route.h>
64
65 #ifdef INET
66 #include <netinet/in.h>
67 #include <netinet/in_var.h>
68 #include <netinet/in_systm.h>
69 #include <netinet/ip.h>
70 #include <netinet/ip_var.h>
71 #include <netinet/if_ether.h>
72 #include <machine/in_cksum.h>
73 #endif
74
75 #ifdef INET6
76 #include <netinet/icmp6.h>
77 #include <netinet/ip6.h>
78 #include <netinet6/ip6_var.h>
79 #include <netinet6/nd6.h>
80 #include <net/if_dl.h>
81 #endif
82
83 #include <crypto/sha1.h>
84 #include <netinet/ip_carp.h>
85
86 #define CARP_IFNAME "carp"
87 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces");
88 SYSCTL_DECL(_net_inet_carp);
89
90 struct carp_softc {
91 struct arpcom sc_ac; /* Interface clue */
92 #define sc_if sc_ac.ac_if
93 struct ifnet *sc_carpdev; /* Pointer to parent interface */
94 struct in_ifaddr *sc_ia; /* primary iface address */
95 struct ip_moptions sc_imo;
96 #ifdef INET6
97 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */
98 struct ip6_moptions sc_im6o;
99 #endif /* INET6 */
100 TAILQ_ENTRY(carp_softc) sc_list;
101
102 enum { INIT = 0, BACKUP, MASTER } sc_state;
103
104 int sc_flags_backup;
105 int sc_suppress;
106
107 int sc_sendad_errors;
108 #define CARP_SENDAD_MAX_ERRORS 3
109 int sc_sendad_success;
110 #define CARP_SENDAD_MIN_SUCCESS 3
111
112 int sc_vhid;
113 int sc_advskew;
114 int sc_naddrs;
115 int sc_naddrs6;
116 int sc_advbase; /* seconds */
117 int sc_init_counter;
118 u_int64_t sc_counter;
119
120 /* authentication */
121 #define CARP_HMAC_PAD 64
122 unsigned char sc_key[CARP_KEY_LEN];
123 unsigned char sc_pad[CARP_HMAC_PAD];
124 SHA1_CTX sc_sha1;
125
126 struct callout sc_ad_tmo; /* advertisement timeout */
127 struct callout sc_md_tmo; /* master down timeout */
128 struct callout sc_md6_tmo; /* master down timeout */
129
130 LIST_ENTRY(carp_softc) sc_next; /* Interface clue */
131 };
132
133 int carp_suppress_preempt = 0;
134 int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */
135 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW,
136 &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets");
137 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW,
138 &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode");
139 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW,
140 &carp_opts[CARPCTL_LOG], 0, "log bad carp packets");
141 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW,
142 &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses");
143
144 struct carpstats carpstats;
145 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW,
146 &carpstats, carpstats,
147 "CARP statistics (struct carpstats, netinet/ip_carp.h)");
148
149 struct carp_if {
150 TAILQ_HEAD(, carp_softc) vhif_vrs;
151 int vhif_nvrs;
152
153 struct callout cif_tmo;
154 struct ifnet *vhif_ifp;
155 struct mtx vhif_mtx;
156 };
157
158 /* Get carp_if from softc. Valid after carp_set_addr{,6}. */
159 #define SC2CIF(sc) ((struct carp_if *)(sc)->sc_carpdev->if_carp)
160
161 /* lock per carp_if queue */
162 #define CARP_LOCK_INIT(cif) mtx_init(&(cif)->vhif_mtx, "carp_if", \
163 NULL, MTX_DEF)
164 #define CARP_LOCK_DESTROY(cif) mtx_destroy(&(cif)->vhif_mtx)
165 #define CARP_LOCK_ASSERT(cif) mtx_assert(&(cif)->vhif_mtx, MA_OWNED)
166 #define CARP_LOCK(cif) mtx_lock(&(cif)->vhif_mtx)
167 #define CARP_UNLOCK(cif) mtx_unlock(&(cif)->vhif_mtx)
168
169 #define CARP_SCLOCK(sc) mtx_lock(&SC2CIF(sc)->vhif_mtx)
170 #define CARP_SCUNLOCK(sc) mtx_unlock(&SC2CIF(sc)->vhif_mtx)
171 #define CARP_SCLOCK_ASSERT(sc) mtx_assert(&SC2CIF(sc)->vhif_mtx, MA_OWNED)
172
173 #define CARP_LOG(...) do { \
174 if (carp_opts[CARPCTL_LOG] > 0) \
175 log(LOG_INFO, __VA_ARGS__); \
176 } while (0)
177
178 #define CARP_DEBUG(...) do { \
179 if (carp_opts[CARPCTL_LOG] > 1) \
180 log(LOG_DEBUG, __VA_ARGS__); \
181 } while (0)
182
183 static void carp_hmac_prepare(struct carp_softc *);
184 static void carp_hmac_generate(struct carp_softc *, u_int32_t *,
185 unsigned char *);
186 static int carp_hmac_verify(struct carp_softc *, u_int32_t *,
187 unsigned char *);
188 static void carp_setroute(struct carp_softc *, int);
189 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t);
190 static int carp_clone_create(struct if_clone *, int);
191 static void carp_clone_destroy(struct ifnet *);
192 static void carpdetach(struct carp_softc *);
193 static int carp_prepare_ad(struct mbuf *, struct carp_softc *,
194 struct carp_header *);
195 static void carp_send_ad_all(void);
196 static void carp_send_ad(void *);
197 static void carp_send_ad_locked(struct carp_softc *);
198 static void carp_send_arp(struct carp_softc *);
199 static void carp_master_down(void *);
200 static void carp_master_down_locked(struct carp_softc *);
201 static int carp_ioctl(struct ifnet *, u_long, caddr_t);
202 static int carp_looutput(struct ifnet *, struct mbuf *, struct sockaddr *,
203 struct rtentry *);
204 static void carp_start(struct ifnet *);
205 static void carp_setrun(struct carp_softc *, sa_family_t);
206 static void carp_set_state(struct carp_softc *, int);
207 static int carp_addrcount(struct carp_if *, struct in_ifaddr *, int);
208 enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING };
209
210 static int carp_set_addr(struct carp_softc *, struct sockaddr_in *);
211 static int carp_del_addr(struct carp_softc *, struct sockaddr_in *);
212 static void carp_carpdev_state1(void *);
213 static void carp_carpdev_state_locked(struct carp_if *);
214 static void carp_sc_state_locked(struct carp_softc *);
215 #ifdef INET6
216 static void carp_send_na(struct carp_softc *);
217 static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *);
218 static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *);
219 #endif
220
221 static LIST_HEAD(, carp_softc) carpif_list;
222 static struct mtx carp_mtx;
223 IFC_SIMPLE_DECLARE(carp, 0);
224
225 static __inline u_int16_t
226 carp_cksum(struct mbuf *m, int len)
227 {
228 return (in_cksum(m, len));
229 }
230
231 static void
232 carp_hmac_prepare(struct carp_softc *sc)
233 {
234 u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
235 u_int8_t vhid = sc->sc_vhid & 0xff;
236 struct ifaddr *ifa;
237 int i;
238 #ifdef INET6
239 struct in6_addr in6;
240 #endif
241
242 if (sc->sc_carpdev)
243 CARP_SCLOCK(sc);
244
245 /* XXX: possible race here */
246
247 /* compute ipad from key */
248 bzero(sc->sc_pad, sizeof(sc->sc_pad));
249 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
250 for (i = 0; i < sizeof(sc->sc_pad); i++)
251 sc->sc_pad[i] ^= 0x36;
252
253 /* precompute first part of inner hash */
254 SHA1Init(&sc->sc_sha1);
255 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
256 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
257 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
258 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
259 #ifdef INET
260 TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) {
261 if (ifa->ifa_addr->sa_family == AF_INET)
262 SHA1Update(&sc->sc_sha1,
263 (void *)&ifatoia(ifa)->ia_addr.sin_addr.s_addr,
264 sizeof(struct in_addr));
265 }
266 #endif /* INET */
267 #ifdef INET6
268 TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) {
269 if (ifa->ifa_addr->sa_family == AF_INET6) {
270 in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
271 if (IN6_IS_ADDR_LINKLOCAL(&in6))
272 in6.s6_addr16[1] = 0;
273 SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6));
274 }
275 }
276 #endif /* INET6 */
277
278 /* convert ipad to opad */
279 for (i = 0; i < sizeof(sc->sc_pad); i++)
280 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
281
282 if (sc->sc_carpdev)
283 CARP_SCUNLOCK(sc);
284 }
285
286 static void
287 carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2],
288 unsigned char md[20])
289 {
290 SHA1_CTX sha1ctx;
291
292 /* fetch first half of inner hash */
293 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
294
295 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
296 SHA1Final(md, &sha1ctx);
297
298 /* outer hash */
299 SHA1Init(&sha1ctx);
300 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
301 SHA1Update(&sha1ctx, md, 20);
302 SHA1Final(md, &sha1ctx);
303 }
304
305 static int
306 carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2],
307 unsigned char md[20])
308 {
309 unsigned char md2[20];
310
311 CARP_SCLOCK_ASSERT(sc);
312
313 carp_hmac_generate(sc, counter, md2);
314
315 return (bcmp(md, md2, sizeof(md2)));
316 }
317
318 static void
319 carp_setroute(struct carp_softc *sc, int cmd)
320 {
321 struct ifaddr *ifa;
322 int s;
323
324 if (sc->sc_carpdev)
325 CARP_SCLOCK_ASSERT(sc);
326
327 s = splnet();
328 TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) {
329 if (ifa->ifa_addr->sa_family == AF_INET &&
330 sc->sc_carpdev != NULL) {
331 int count = carp_addrcount(
332 (struct carp_if *)sc->sc_carpdev->if_carp,
333 ifatoia(ifa), CARP_COUNT_MASTER);
334
335 if ((cmd == RTM_ADD && count == 1) ||
336 (cmd == RTM_DELETE && count == 0))
337 rtinit(ifa, cmd, RTF_UP | RTF_HOST);
338 }
339 #ifdef INET6
340 if (ifa->ifa_addr->sa_family == AF_INET6) {
341 if (cmd == RTM_ADD)
342 in6_ifaddloop(ifa);
343 else
344 in6_ifremloop(ifa);
345 }
346 #endif /* INET6 */
347 }
348 splx(s);
349 }
350
351 static int
352 carp_clone_create(struct if_clone *ifc, int unit)
353 {
354
355 struct carp_softc *sc;
356 struct ifnet *ifp;
357
358 MALLOC(sc, struct carp_softc *, sizeof(*sc), M_CARP, M_WAITOK|M_ZERO);
359
360 sc->sc_flags_backup = 0;
361 sc->sc_suppress = 0;
362 sc->sc_advbase = CARP_DFLTINTV;
363 sc->sc_vhid = -1; /* required setting */
364 sc->sc_advskew = 0;
365 sc->sc_init_counter = 1;
366 sc->sc_naddrs = sc->sc_naddrs6 = 0; /* M_ZERO? */
367 #ifdef INET6
368 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
369 #endif
370
371 callout_init(&sc->sc_ad_tmo, NET_CALLOUT_MPSAFE);
372 callout_init(&sc->sc_md_tmo, NET_CALLOUT_MPSAFE);
373 callout_init(&sc->sc_md6_tmo, NET_CALLOUT_MPSAFE);
374
375 ifp = &sc->sc_if;
376 ifp->if_softc = sc;
377 if_initname(ifp, CARP_IFNAME, unit);
378 ifp->if_mtu = ETHERMTU;
379 ifp->if_flags = 0;
380 ifp->if_ioctl = carp_ioctl;
381 ifp->if_output = carp_looutput;
382 ifp->if_start = carp_start;
383 ifp->if_type = IFT_CARP;
384 ifp->if_snd.ifq_maxlen = ifqmaxlen;
385 ifp->if_hdrlen = 0;
386 if_attach(ifp);
387 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int32_t));
388 mtx_lock(&carp_mtx);
389 LIST_INSERT_HEAD(&carpif_list, sc, sc_next);
390 mtx_unlock(&carp_mtx);
391 return (0);
392 }
393
394 static void
395 carp_clone_destroy(struct ifnet *ifp)
396 {
397 struct carp_softc *sc = ifp->if_softc;
398 struct carp_if *cif;
399 struct ip_moptions *imo = &sc->sc_imo;
400 #ifdef INET6
401 struct ip6_moptions *im6o = &sc->sc_im6o;
402 #endif
403
404 /* carpdetach(sc); */
405
406 callout_stop(&sc->sc_ad_tmo);
407 callout_stop(&sc->sc_md_tmo);
408 callout_stop(&sc->sc_md6_tmo);
409
410 if (imo->imo_num_memberships) {
411 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
412 imo->imo_multicast_ifp = NULL;
413 }
414 #ifdef INET6
415 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
416 struct in6_multi_mship *imm =
417 LIST_FIRST(&im6o->im6o_memberships);
418 LIST_REMOVE(imm, i6mm_chain);
419 in6_leavegroup(imm);
420 }
421 im6o->im6o_multicast_ifp = NULL;
422 #endif
423
424 /* Remove ourself from parents if_carp queue */
425 if (sc->sc_carpdev && (cif = sc->sc_carpdev->if_carp)) {
426 CARP_LOCK(cif);
427 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
428 if (!--cif->vhif_nvrs) {
429 callout_drain(&cif->cif_tmo);
430 sc->sc_carpdev->if_carp = NULL;
431 CARP_LOCK_DESTROY(cif);
432 FREE(cif, M_CARP);
433 ifpromisc(sc->sc_carpdev, 0);
434 } else {
435 CARP_UNLOCK(cif);
436 }
437 }
438
439 mtx_lock(&carp_mtx);
440 LIST_REMOVE(sc, sc_next);
441 mtx_unlock(&carp_mtx);
442 bpfdetach(ifp);
443 if_detach(ifp);
444 free(sc, M_CARP);
445 }
446
447 /*
448 * process input packet.
449 * we have rearranged checks order compared to the rfc,
450 * but it seems more efficient this way or not possible otherwise.
451 */
452 void
453 carp_input(struct mbuf *m, int hlen)
454 {
455 struct ip *ip = mtod(m, struct ip *);
456 struct carp_header *ch;
457 int iplen, len;
458
459 carpstats.carps_ipackets++;
460
461 if (!carp_opts[CARPCTL_ALLOW]) {
462 m_freem(m);
463 return;
464 }
465
466 /* check if received on a valid carp interface */
467 if (m->m_pkthdr.rcvif->if_carp == NULL) {
468 carpstats.carps_badif++;
469 CARP_LOG("carp_input: packet received on non-carp "
470 "interface: %s\n",
471 m->m_pkthdr.rcvif->if_xname);
472 m_freem(m);
473 return;
474 }
475
476 /* verify that the IP TTL is 255. */
477 if (ip->ip_ttl != CARP_DFLTTL) {
478 carpstats.carps_badttl++;
479 CARP_LOG("carp_input: received ttl %d != 255i on %s\n",
480 ip->ip_ttl,
481 m->m_pkthdr.rcvif->if_xname);
482 m_freem(m);
483 return;
484 }
485
486 iplen = ip->ip_hl << 2;
487
488 if (m->m_pkthdr.len < iplen + sizeof(*ch)) {
489 carpstats.carps_badlen++;
490 CARP_LOG("carp_input: received len %zd < "
491 "sizeof(struct carp_header)\n",
492 m->m_len - sizeof(struct ip));
493 m_freem(m);
494 return;
495 }
496
497 if (iplen + sizeof(*ch) < m->m_len) {
498 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) {
499 carpstats.carps_hdrops++;
500 CARP_LOG("carp_input: pullup failed\n");
501 return;
502 }
503 ip = mtod(m, struct ip *);
504 }
505 ch = (struct carp_header *)((char *)ip + iplen);
506
507 /*
508 * verify that the received packet length is
509 * equal to the CARP header
510 */
511 len = iplen + sizeof(*ch);
512 if (len > m->m_pkthdr.len) {
513 carpstats.carps_badlen++;
514 CARP_LOG("carp_input: packet too short %d on %s\n",
515 m->m_pkthdr.len,
516 m->m_pkthdr.rcvif->if_xname);
517 m_freem(m);
518 return;
519 }
520
521 if ((m = m_pullup(m, len)) == NULL) {
522 carpstats.carps_hdrops++;
523 return;
524 }
525 ip = mtod(m, struct ip *);
526 ch = (struct carp_header *)((char *)ip + iplen);
527
528 /* verify the CARP checksum */
529 m->m_data += iplen;
530 if (carp_cksum(m, len - iplen)) {
531 carpstats.carps_badsum++;
532 CARP_LOG("carp_input: checksum failed on %s\n",
533 m->m_pkthdr.rcvif->if_xname);
534 m_freem(m);
535 return;
536 }
537 m->m_data -= iplen;
538
539 carp_input_c(m, ch, AF_INET);
540 }
541
542 #ifdef INET6
543 int
544 carp6_input(struct mbuf **mp, int *offp, int proto)
545 {
546 struct mbuf *m = *mp;
547 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
548 struct carp_header *ch;
549 u_int len;
550
551 carpstats.carps_ipackets6++;
552
553 if (!carp_opts[CARPCTL_ALLOW]) {
554 m_freem(m);
555 return (IPPROTO_DONE);
556 }
557
558 /* check if received on a valid carp interface */
559 if (m->m_pkthdr.rcvif->if_carp == NULL) {
560 carpstats.carps_badif++;
561 CARP_LOG("carp6_input: packet received on non-carp "
562 "interface: %s\n",
563 m->m_pkthdr.rcvif->if_xname);
564 m_freem(m);
565 return (IPPROTO_DONE);
566 }
567
568 /* verify that the IP TTL is 255 */
569 if (ip6->ip6_hlim != CARP_DFLTTL) {
570 carpstats.carps_badttl++;
571 CARP_LOG("carp6_input: received ttl %d != 255 on %s\n",
572 ip6->ip6_hlim,
573 m->m_pkthdr.rcvif->if_xname);
574 m_freem(m);
575 return (IPPROTO_DONE);
576 }
577
578 /* verify that we have a complete carp packet */
579 len = m->m_len;
580 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
581 if (ch == NULL) {
582 carpstats.carps_badlen++;
583 CARP_LOG("carp6_input: packet size %u too small\n", len);
584 return (IPPROTO_DONE);
585 }
586
587
588 /* verify the CARP checksum */
589 m->m_data += *offp;
590 if (carp_cksum(m, sizeof(*ch))) {
591 carpstats.carps_badsum++;
592 CARP_LOG("carp6_input: checksum failed, on %s\n",
593 m->m_pkthdr.rcvif->if_xname);
594 m_freem(m);
595 return (IPPROTO_DONE);
596 }
597 m->m_data -= *offp;
598
599 carp_input_c(m, ch, AF_INET6);
600 return (IPPROTO_DONE);
601 }
602 #endif /* INET6 */
603
604 static void
605 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af)
606 {
607 struct ifnet *ifp = m->m_pkthdr.rcvif;
608 struct carp_softc *sc;
609 u_int64_t tmp_counter;
610 struct timeval sc_tv, ch_tv;
611
612 /* verify that the VHID is valid on the receiving interface */
613 CARP_LOCK(ifp->if_carp);
614 TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list)
615 if (sc->sc_vhid == ch->carp_vhid)
616 break;
617
618 if (!sc || (sc->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) !=
619 (IFF_UP|IFF_RUNNING)) {
620 carpstats.carps_badvhid++;
621 CARP_UNLOCK(ifp->if_carp);
622 m_freem(m);
623 return;
624 }
625
626 getmicrotime(&sc->sc_if.if_lastchange);
627 sc->sc_if.if_ipackets++;
628 sc->sc_if.if_ibytes += m->m_pkthdr.len;
629
630 if (sc->sc_if.if_bpf) {
631 struct ip *ip = mtod(m, struct ip *);
632 uint32_t af1 = af;
633
634 /* BPF wants net byte order */
635 ip->ip_len = htons(ip->ip_len + (ip->ip_hl << 2));
636 ip->ip_off = htons(ip->ip_off);
637 bpf_mtap2(sc->sc_if.if_bpf, &af1, sizeof(af1), m);
638 }
639
640 /* verify the CARP version. */
641 if (ch->carp_version != CARP_VERSION) {
642 carpstats.carps_badver++;
643 sc->sc_if.if_ierrors++;
644 CARP_UNLOCK(ifp->if_carp);
645 CARP_LOG("%s; invalid version %d\n",
646 sc->sc_if.if_xname,
647 ch->carp_version);
648 m_freem(m);
649 return;
650 }
651
652 /* verify the hash */
653 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
654 carpstats.carps_badauth++;
655 sc->sc_if.if_ierrors++;
656 CARP_UNLOCK(ifp->if_carp);
657 CARP_LOG("%s: incorrect hash\n", sc->sc_if.if_xname);
658 m_freem(m);
659 return;
660 }
661
662 tmp_counter = ntohl(ch->carp_counter[0]);
663 tmp_counter = tmp_counter<<32;
664 tmp_counter += ntohl(ch->carp_counter[1]);
665
666 /* XXX Replay protection goes here */
667
668 sc->sc_init_counter = 0;
669 sc->sc_counter = tmp_counter;
670
671 sc_tv.tv_sec = sc->sc_advbase;
672 if (carp_suppress_preempt && sc->sc_advskew < 240)
673 sc_tv.tv_usec = 240 * 1000000 / 256;
674 else
675 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256;
676 ch_tv.tv_sec = ch->carp_advbase;
677 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
678
679 switch (sc->sc_state) {
680 case INIT:
681 break;
682 case MASTER:
683 /*
684 * If we receive an advertisement from a master who's going to
685 * be more frequent than us, go into BACKUP state.
686 */
687 if (timevalcmp(&sc_tv, &ch_tv, >) ||
688 timevalcmp(&sc_tv, &ch_tv, ==)) {
689 callout_stop(&sc->sc_ad_tmo);
690 CARP_DEBUG("%s: MASTER -> BACKUP "
691 "(more frequent advertisement received)\n",
692 sc->sc_if.if_xname);
693 carp_set_state(sc, BACKUP);
694 carp_setrun(sc, 0);
695 carp_setroute(sc, RTM_DELETE);
696 }
697 break;
698 case BACKUP:
699 /*
700 * If we're pre-empting masters who advertise slower than us,
701 * and this one claims to be slower, treat him as down.
702 */
703 if (carp_opts[CARPCTL_PREEMPT] &&
704 timevalcmp(&sc_tv, &ch_tv, <)) {
705 CARP_DEBUG("%s: BACKUP -> MASTER "
706 "(preempting a slower master)\n",
707 sc->sc_if.if_xname);
708 carp_master_down_locked(sc);
709 break;
710 }
711
712 /*
713 * If the master is going to advertise at such a low frequency
714 * that he's guaranteed to time out, we'd might as well just
715 * treat him as timed out now.
716 */
717 sc_tv.tv_sec = sc->sc_advbase * 3;
718 if (timevalcmp(&sc_tv, &ch_tv, <)) {
719 CARP_DEBUG("%s: BACKUP -> MASTER "
720 "(master timed out)\n",
721 sc->sc_if.if_xname);
722 carp_master_down_locked(sc);
723 break;
724 }
725
726 /*
727 * Otherwise, we reset the counter and wait for the next
728 * advertisement.
729 */
730 carp_setrun(sc, af);
731 break;
732 }
733
734 CARP_UNLOCK(ifp->if_carp);
735
736 m_freem(m);
737 return;
738 }
739
740 static void
741 carpdetach(struct carp_softc *sc)
742 {
743 struct ifaddr *ifa;
744
745 callout_stop(&sc->sc_ad_tmo);
746 callout_stop(&sc->sc_md_tmo);
747 callout_stop(&sc->sc_md6_tmo);
748
749 while ((ifa = TAILQ_FIRST(&sc->sc_if.if_addrlist)) != NULL)
750 if (ifa->ifa_addr->sa_family == AF_INET) {
751 struct in_ifaddr *ia = ifatoia(ifa);
752
753 carp_del_addr(sc, &ia->ia_addr);
754
755 /* ripped screaming from in_control(SIOCDIFADDR) */
756 in_ifscrub(&sc->sc_if, ia);
757 TAILQ_REMOVE(&sc->sc_if.if_addrlist, ifa, ifa_link);
758 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link);
759 IFAFREE((&ia->ia_ifa));
760 }
761 }
762
763 /* Detach an interface from the carp. */
764 void
765 carp_ifdetach(struct ifnet *ifp)
766 {
767 struct carp_softc *sc;
768 struct carp_if *cif = (struct carp_if *)ifp->if_carp;
769
770 CARP_LOCK(cif);
771 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
772 carpdetach(sc);
773 CARP_UNLOCK(cif);
774 }
775
776 static int
777 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch)
778 {
779 struct m_tag *mtag;
780 struct ifnet *ifp = &sc->sc_if;
781
782 if (sc->sc_init_counter) {
783 /* this could also be seconds since unix epoch */
784 sc->sc_counter = arc4random();
785 sc->sc_counter = sc->sc_counter << 32;
786 sc->sc_counter += arc4random();
787 } else
788 sc->sc_counter++;
789
790 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff);
791 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff);
792
793 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
794
795 /* Tag packet for carp_output */
796 mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct ifnet *), M_NOWAIT);
797 if (mtag == NULL) {
798 m_freem(m);
799 sc->sc_if.if_oerrors++;
800 return (ENOMEM);
801 }
802 bcopy(&ifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *));
803 m_tag_prepend(m, mtag);
804
805 return (0);
806 }
807
808 static void
809 carp_send_ad_all(void)
810 {
811 struct carp_softc *sc;
812
813 mtx_lock(&carp_mtx);
814 LIST_FOREACH(sc, &carpif_list, sc_next) {
815 if (sc->sc_carpdev == NULL)
816 continue;
817 CARP_SCLOCK(sc);
818 if ((sc->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) &&
819 sc->sc_state == MASTER)
820 carp_send_ad_locked(sc);
821 CARP_SCUNLOCK(sc);
822 }
823 mtx_unlock(&carp_mtx);
824 }
825
826 static void
827 carp_send_ad(void *v)
828 {
829 struct carp_softc *sc = v;
830
831 CARP_SCLOCK(sc);
832 carp_send_ad_locked(sc);
833 CARP_SCUNLOCK(sc);
834 }
835
836 static void
837 carp_send_ad_locked(struct carp_softc *sc)
838 {
839 struct carp_header ch;
840 struct timeval tv;
841 struct carp_header *ch_ptr;
842 struct mbuf *m;
843 int len, advbase, advskew;
844
845 CARP_SCLOCK_ASSERT(sc);
846
847 /* bow out if we've lost our UPness or RUNNINGuiness */
848 if ((sc->sc_if.if_flags &
849 (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
850 advbase = 255;
851 advskew = 255;
852 } else {
853 advbase = sc->sc_advbase;
854 if (!carp_suppress_preempt || sc->sc_advskew > 240)
855 advskew = sc->sc_advskew;
856 else
857 advskew = 240;
858 tv.tv_sec = advbase;
859 tv.tv_usec = advskew * 1000000 / 256;
860 }
861
862 ch.carp_version = CARP_VERSION;
863 ch.carp_type = CARP_ADVERTISEMENT;
864 ch.carp_vhid = sc->sc_vhid;
865 ch.carp_advbase = advbase;
866 ch.carp_advskew = advskew;
867 ch.carp_authlen = 7; /* XXX DEFINE */
868 ch.carp_pad1 = 0; /* must be zero */
869 ch.carp_cksum = 0;
870
871 #ifdef INET
872 if (sc->sc_ia) {
873 struct ip *ip;
874
875 MGETHDR(m, M_DONTWAIT, MT_HEADER);
876 if (m == NULL) {
877 sc->sc_ac.ac_if.if_oerrors++;
878 carpstats.carps_onomem++;
879 /* XXX maybe less ? */
880 if (advbase != 255 || advskew != 255)
881 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
882 carp_send_ad, sc);
883 return;
884 }
885 len = sizeof(*ip) + sizeof(ch);
886 m->m_pkthdr.len = len;
887 m->m_pkthdr.rcvif = NULL;
888 m->m_len = len;
889 MH_ALIGN(m, m->m_len);
890 m->m_flags |= M_MCAST;
891 ip = mtod(m, struct ip *);
892 ip->ip_v = IPVERSION;
893 ip->ip_hl = sizeof(*ip) >> 2;
894 ip->ip_tos = IPTOS_LOWDELAY;
895 ip->ip_len = len;
896 ip->ip_id = ip_newid();
897 ip->ip_off = IP_DF;
898 ip->ip_ttl = CARP_DFLTTL;
899 ip->ip_p = IPPROTO_CARP;
900 ip->ip_sum = 0;
901 ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr;
902 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
903
904 ch_ptr = (struct carp_header *)(&ip[1]);
905 bcopy(&ch, ch_ptr, sizeof(ch));
906 if (carp_prepare_ad(m, sc, ch_ptr))
907 return;
908
909 m->m_data += sizeof(*ip);
910 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip));
911 m->m_data -= sizeof(*ip);
912
913 getmicrotime(&sc->sc_if.if_lastchange);
914 sc->sc_ac.ac_if.if_opackets++;
915 sc->sc_ac.ac_if.if_obytes += len;
916 carpstats.carps_opackets++;
917
918 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) {
919 sc->sc_if.if_oerrors++;
920 if (sc->sc_sendad_errors < INT_MAX)
921 sc->sc_sendad_errors++;
922 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
923 carp_suppress_preempt++;
924 if (carp_suppress_preempt == 1) {
925 CARP_SCUNLOCK(sc);
926 carp_send_ad_all();
927 CARP_SCLOCK(sc);
928 }
929 }
930 sc->sc_sendad_success = 0;
931 } else {
932 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
933 if (++sc->sc_sendad_success >=
934 CARP_SENDAD_MIN_SUCCESS) {
935 carp_suppress_preempt--;
936 sc->sc_sendad_errors = 0;
937 }
938 } else
939 sc->sc_sendad_errors = 0;
940 }
941 }
942 #endif /* INET */
943 #ifdef INET6
944 if (sc->sc_ia6) {
945 struct ip6_hdr *ip6;
946
947 MGETHDR(m, M_DONTWAIT, MT_HEADER);
948 if (m == NULL) {
949 sc->sc_ac.ac_if.if_oerrors++;
950 carpstats.carps_onomem++;
951 /* XXX maybe less ? */
952 if (advbase != 255 || advskew != 255)
953 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
954 carp_send_ad, sc);
955 return;
956 }
957 len = sizeof(*ip6) + sizeof(ch);
958 m->m_pkthdr.len = len;
959 m->m_pkthdr.rcvif = NULL;
960 m->m_len = len;
961 MH_ALIGN(m, m->m_len);
962 m->m_flags |= M_MCAST;
963 ip6 = mtod(m, struct ip6_hdr *);
964 bzero(ip6, sizeof(*ip6));
965 ip6->ip6_vfc |= IPV6_VERSION;
966 ip6->ip6_hlim = CARP_DFLTTL;
967 ip6->ip6_nxt = IPPROTO_CARP;
968 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src,
969 sizeof(struct in6_addr));
970 /* set the multicast destination */
971
972 ip6->ip6_dst.s6_addr8[0] = 0xff;
973 ip6->ip6_dst.s6_addr8[1] = 0x02;
974 ip6->ip6_dst.s6_addr8[15] = 0x12;
975
976 ch_ptr = (struct carp_header *)(&ip6[1]);
977 bcopy(&ch, ch_ptr, sizeof(ch));
978 if (carp_prepare_ad(m, sc, ch_ptr))
979 return;
980
981 m->m_data += sizeof(*ip6);
982 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6));
983 m->m_data -= sizeof(*ip6);
984
985 getmicrotime(&sc->sc_if.if_lastchange);
986 sc->sc_if.if_opackets++;
987 sc->sc_if.if_obytes += len;
988 carpstats.carps_opackets6++;
989
990 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) {
991 sc->sc_if.if_oerrors++;
992 if (sc->sc_sendad_errors < INT_MAX)
993 sc->sc_sendad_errors++;
994 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
995 carp_suppress_preempt++;
996 if (carp_suppress_preempt == 1) {
997 CARP_SCUNLOCK(sc);
998 carp_send_ad_all();
999 CARP_SCLOCK(sc);
1000 }
1001 }
1002 sc->sc_sendad_success = 0;
1003 } else {
1004 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1005 if (++sc->sc_sendad_success >=
1006 CARP_SENDAD_MIN_SUCCESS) {
1007 carp_suppress_preempt--;
1008 sc->sc_sendad_errors = 0;
1009 }
1010 } else
1011 sc->sc_sendad_errors = 0;
1012 }
1013 }
1014 #endif /* INET6 */
1015
1016 if (advbase != 255 || advskew != 255)
1017 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1018 carp_send_ad, sc);
1019
1020 }
1021
1022 /*
1023 * Broadcast a gratuitous ARP request containing
1024 * the virtual router MAC address for each IP address
1025 * associated with the virtual router.
1026 */
1027 static void
1028 carp_send_arp(struct carp_softc *sc)
1029 {
1030 struct ifaddr *ifa;
1031
1032 TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) {
1033
1034 if (ifa->ifa_addr->sa_family != AF_INET)
1035 continue;
1036
1037 /* arprequest(sc->sc_carpdev, &in, &in, sc->sc_ac.ac_enaddr); */
1038 arp_ifinit2(sc->sc_carpdev, ifa, sc->sc_ac.ac_enaddr);
1039
1040 DELAY(1000); /* XXX */
1041 }
1042 }
1043
1044 #ifdef INET6
1045 static void
1046 carp_send_na(struct carp_softc *sc)
1047 {
1048 struct ifaddr *ifa;
1049 struct in6_addr *in6;
1050 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1051
1052 TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) {
1053
1054 if (ifa->ifa_addr->sa_family != AF_INET6)
1055 continue;
1056
1057 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
1058 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1059 ND_NA_FLAG_OVERRIDE, 1, NULL);
1060 DELAY(1000); /* XXX */
1061 }
1062 }
1063 #endif /* INET6 */
1064
1065 static int
1066 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type)
1067 {
1068 struct carp_softc *vh;
1069 struct ifaddr *ifa;
1070 int count = 0;
1071
1072 CARP_LOCK_ASSERT(cif);
1073
1074 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1075 if ((type == CARP_COUNT_RUNNING &&
1076 (vh->sc_ac.ac_if.if_flags & (IFF_UP|IFF_RUNNING)) ==
1077 (IFF_UP|IFF_RUNNING)) ||
1078 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) {
1079 TAILQ_FOREACH(ifa, &vh->sc_ac.ac_if.if_addrlist,
1080 ifa_list) {
1081 if (ifa->ifa_addr->sa_family == AF_INET &&
1082 ia->ia_addr.sin_addr.s_addr ==
1083 ifatoia(ifa)->ia_addr.sin_addr.s_addr)
1084 count++;
1085 }
1086 }
1087 }
1088 return (count);
1089 }
1090
1091 int
1092 carp_iamatch(void *v, struct in_ifaddr *ia,
1093 struct in_addr *isaddr, u_int8_t **enaddr)
1094 {
1095 struct carp_if *cif = v;
1096 struct carp_softc *vh;
1097 int index, count = 0;
1098 struct ifaddr *ifa;
1099
1100 CARP_LOCK(cif);
1101
1102 if (carp_opts[CARPCTL_ARPBALANCE]) {
1103 /*
1104 * XXX proof of concept implementation.
1105 * We use the source ip to decide which virtual host should
1106 * handle the request. If we're master of that virtual host,
1107 * then we respond, otherwise, just drop the arp packet on
1108 * the floor.
1109 */
1110 count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING);
1111 if (count == 0) {
1112 /* should never reach this */
1113 CARP_UNLOCK(cif);
1114 return (0);
1115 }
1116
1117 /* this should be a hash, like pf_hash() */
1118 index = isaddr->s_addr % count;
1119 count = 0;
1120
1121 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1122 if ((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) ==
1123 (IFF_UP|IFF_RUNNING)) {
1124 TAILQ_FOREACH(ifa, &vh->sc_if.if_addrlist,
1125 ifa_list) {
1126 if (ifa->ifa_addr->sa_family ==
1127 AF_INET &&
1128 ia->ia_addr.sin_addr.s_addr ==
1129 ifatoia(ifa)->ia_addr.sin_addr.s_addr) {
1130 if (count == index) {
1131 if (vh->sc_state ==
1132 MASTER) {
1133 *enaddr = vh->sc_ac.ac_enaddr;
1134 CARP_UNLOCK(cif);
1135 return (1);
1136 } else {
1137 CARP_UNLOCK(cif);
1138 return (0);
1139 }
1140 }
1141 count++;
1142 }
1143 }
1144 }
1145 }
1146 } else {
1147 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1148 if ((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) ==
1149 (IFF_UP|IFF_RUNNING) && ia->ia_ifp ==
1150 &vh->sc_if) {
1151 *enaddr = vh->sc_ac.ac_enaddr;
1152 CARP_UNLOCK(cif);
1153 return (1);
1154 }
1155 }
1156 }
1157 CARP_UNLOCK(cif);
1158 return (0);
1159 }
1160
1161 #ifdef INET6
1162 struct ifaddr *
1163 carp_iamatch6(void *v, struct in6_addr *taddr)
1164 {
1165 struct carp_if *cif = v;
1166 struct carp_softc *vh;
1167 struct ifaddr *ifa;
1168
1169 CARP_LOCK(cif);
1170 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1171 TAILQ_FOREACH(ifa, &vh->sc_if.if_addrlist, ifa_list) {
1172 if (IN6_ARE_ADDR_EQUAL(taddr,
1173 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1174 ((vh->sc_if.if_flags &
1175 (IFF_UP|IFF_RUNNING)) == (IFF_UP|IFF_RUNNING))) {
1176 CARP_UNLOCK(cif);
1177 return (ifa);
1178 }
1179 }
1180 }
1181 CARP_UNLOCK(cif);
1182
1183 return (NULL);
1184 }
1185
1186 void *
1187 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr)
1188 {
1189 struct m_tag *mtag;
1190 struct carp_if *cif = v;
1191 struct carp_softc *sc;
1192 struct ifaddr *ifa;
1193
1194 CARP_LOCK(cif);
1195 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
1196 TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) {
1197 if (IN6_ARE_ADDR_EQUAL(taddr,
1198 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1199 ((sc->sc_if.if_flags &
1200 (IFF_UP|IFF_RUNNING)) == (IFF_UP|IFF_RUNNING))) {
1201 struct ifnet *ifp = &sc->sc_if;
1202 mtag = m_tag_get(PACKET_TAG_CARP,
1203 sizeof(struct ifnet *), M_NOWAIT);
1204 if (mtag == NULL) {
1205 /* better a bit than nothing */
1206 CARP_UNLOCK(cif);
1207 return (sc->sc_ac.ac_enaddr);
1208 }
1209 bcopy(&ifp, (caddr_t)(mtag + 1),
1210 sizeof(struct ifnet *));
1211 m_tag_prepend(m, mtag);
1212
1213 CARP_UNLOCK(cif);
1214 return (sc->sc_ac.ac_enaddr);
1215 }
1216 }
1217 }
1218 CARP_UNLOCK(cif);
1219
1220 return (NULL);
1221 }
1222 #endif
1223
1224 struct ifnet *
1225 carp_forus(void *v, void *dhost)
1226 {
1227 struct carp_if *cif = v;
1228 struct carp_softc *vh;
1229 u_int8_t *ena = dhost;
1230
1231 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
1232 return (NULL);
1233
1234 CARP_LOCK(cif);
1235 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list)
1236 if ((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) ==
1237 (IFF_UP|IFF_RUNNING) && vh->sc_state == MASTER &&
1238 !bcmp(dhost, vh->sc_ac.ac_enaddr, ETHER_ADDR_LEN)) {
1239 CARP_UNLOCK(cif);
1240 return (&vh->sc_if);
1241 }
1242
1243 CARP_UNLOCK(cif);
1244 return (NULL);
1245 }
1246
1247 static void
1248 carp_master_down(void *v)
1249 {
1250 struct carp_softc *sc = v;
1251
1252 CARP_SCLOCK(sc);
1253 carp_master_down_locked(sc);
1254 CARP_SCUNLOCK(sc);
1255 }
1256
1257 static void
1258 carp_master_down_locked(struct carp_softc *sc)
1259 {
1260 if (sc->sc_carpdev)
1261 CARP_SCLOCK_ASSERT(sc);
1262
1263 switch (sc->sc_state) {
1264 case INIT:
1265 printf("%s: master_down event in INIT state\n",
1266 sc->sc_if.if_xname);
1267 break;
1268 case MASTER:
1269 break;
1270 case BACKUP:
1271 carp_set_state(sc, MASTER);
1272 carp_send_ad_locked(sc);
1273 carp_send_arp(sc);
1274 #ifdef INET6
1275 carp_send_na(sc);
1276 #endif /* INET6 */
1277 carp_setrun(sc, 0);
1278 carp_setroute(sc, RTM_ADD);
1279 break;
1280 }
1281 }
1282
1283 /*
1284 * When in backup state, af indicates whether to reset the master down timer
1285 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1286 */
1287 static void
1288 carp_setrun(struct carp_softc *sc, sa_family_t af)
1289 {
1290 struct timeval tv;
1291
1292 if (sc->sc_carpdev)
1293 CARP_SCLOCK_ASSERT(sc);
1294
1295 if (sc->sc_if.if_flags & IFF_UP &&
1296 sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6))
1297 sc->sc_if.if_flags |= IFF_RUNNING;
1298 else {
1299 sc->sc_if.if_flags &= ~IFF_RUNNING;
1300 carp_setroute(sc, RTM_DELETE);
1301 return;
1302 }
1303
1304 switch (sc->sc_state) {
1305 case INIT:
1306 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) {
1307 carp_send_ad_locked(sc);
1308 carp_send_arp(sc);
1309 #ifdef INET6
1310 carp_send_na(sc);
1311 #endif /* INET6 */
1312 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n",
1313 sc->sc_if.if_xname);
1314 carp_set_state(sc, MASTER);
1315 carp_setroute(sc, RTM_ADD);
1316 } else {
1317 CARP_DEBUG("%s: INIT -> BACKUP\n", sc->sc_if.if_xname);
1318 carp_set_state(sc, BACKUP);
1319 carp_setroute(sc, RTM_DELETE);
1320 carp_setrun(sc, 0);
1321 }
1322 break;
1323 case BACKUP:
1324 callout_stop(&sc->sc_ad_tmo);
1325 tv.tv_sec = 3 * sc->sc_advbase;
1326 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1327 switch (af) {
1328 #ifdef INET
1329 case AF_INET:
1330 callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
1331 carp_master_down, sc);
1332 break;
1333 #endif /* INET */
1334 #ifdef INET6
1335 case AF_INET6:
1336 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
1337 carp_master_down, sc);
1338 break;
1339 #endif /* INET6 */
1340 default:
1341 if (sc->sc_naddrs)
1342 callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
1343 carp_master_down, sc);
1344 if (sc->sc_naddrs6)
1345 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
1346 carp_master_down, sc);
1347 break;
1348 }
1349 break;
1350 case MASTER:
1351 tv.tv_sec = sc->sc_advbase;
1352 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1353 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1354 carp_send_ad, sc);
1355 break;
1356 }
1357 }
1358
1359 static int
1360 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1361 {
1362 struct ifnet *ifp;
1363 struct carp_if *cif;
1364 struct in_ifaddr *ia, *ia_if;
1365 struct ip_moptions *imo = &sc->sc_imo;
1366 struct in_addr addr;
1367 u_long iaddr = htonl(sin->sin_addr.s_addr);
1368 int own, error;
1369
1370 if (sin->sin_addr.s_addr == 0) {
1371 if (!(sc->sc_if.if_flags & IFF_UP))
1372 carp_set_state(sc, INIT);
1373 if (sc->sc_naddrs)
1374 sc->sc_if.if_flags |= IFF_UP;
1375 carp_setrun(sc, 0);
1376 return (0);
1377 }
1378
1379 /* we have to do it by hands to check we won't match on us */
1380 ia_if = NULL; own = 0;
1381 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
1382 /* and, yeah, we need a multicast-capable iface too */
1383 if (ia->ia_ifp != &sc->sc_if &&
1384 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1385 (iaddr & ia->ia_subnetmask) == ia->ia_subnet) {
1386 if (!ia_if)
1387 ia_if = ia;
1388 if (sin->sin_addr.s_addr ==
1389 ia->ia_addr.sin_addr.s_addr)
1390 own++;
1391 }
1392 }
1393
1394 if (!ia_if)
1395 return (EADDRNOTAVAIL);
1396
1397 ia = ia_if;
1398 ifp = ia->ia_ifp;
1399
1400 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1401 (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp))
1402 return (EADDRNOTAVAIL);
1403
1404 if (imo->imo_num_memberships == 0) {
1405 addr.s_addr = htonl(INADDR_CARP_GROUP);
1406 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL)
1407 return (ENOBUFS);
1408 imo->imo_num_memberships++;
1409 imo->imo_multicast_ifp = ifp;
1410 imo->imo_multicast_ttl = CARP_DFLTTL;
1411 imo->imo_multicast_loop = 0;
1412 }
1413
1414 if (!ifp->if_carp) {
1415
1416 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP,
1417 M_WAITOK|M_ZERO);
1418 if (!cif) {
1419 error = ENOBUFS;
1420 goto cleanup;
1421 }
1422 if ((error = ifpromisc(ifp, 1))) {
1423 FREE(cif, M_CARP);
1424 goto cleanup;
1425 }
1426
1427 CARP_LOCK_INIT(cif);
1428 CARP_LOCK(cif);
1429 cif->vhif_ifp = ifp;
1430 TAILQ_INIT(&cif->vhif_vrs);
1431 callout_init(&cif->cif_tmo, NET_CALLOUT_MPSAFE);
1432 ifp->if_carp = cif;
1433
1434 } else {
1435 struct carp_softc *vr;
1436
1437 cif = (struct carp_if *)ifp->if_carp;
1438 CARP_LOCK(cif);
1439 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1440 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1441 CARP_UNLOCK(cif);
1442 error = EINVAL;
1443 goto cleanup;
1444 }
1445 }
1446 sc->sc_ia = ia;
1447 sc->sc_carpdev = ifp;
1448
1449 { /* XXX prevent endless loop if already in queue */
1450 struct carp_softc *vr, *after = NULL;
1451 int myself = 0;
1452 cif = (struct carp_if *)ifp->if_carp;
1453
1454 /* XXX: cif should not change, right? So we still hold the lock */
1455 CARP_LOCK_ASSERT(cif);
1456
1457 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1458 if (vr == sc)
1459 myself = 1;
1460 if (vr->sc_vhid < sc->sc_vhid)
1461 after = vr;
1462 }
1463
1464 if (!myself) {
1465 /* We're trying to keep things in order */
1466 if (after == NULL) {
1467 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1468 } else {
1469 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1470 }
1471 cif->vhif_nvrs++;
1472 }
1473 }
1474
1475 sc->sc_naddrs++;
1476 sc->sc_if.if_flags |= IFF_UP;
1477 if (own)
1478 sc->sc_advskew = 0;
1479 carp_sc_state_locked(sc);
1480 carp_setrun(sc, 0);
1481
1482 CARP_UNLOCK(cif);
1483
1484 return (0);
1485
1486 cleanup:
1487 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1488 return (error);
1489 }
1490
1491 static int
1492 carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1493 {
1494 int error = 0;
1495
1496 if (!--sc->sc_naddrs) {
1497 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1498 struct ip_moptions *imo = &sc->sc_imo;
1499
1500 CARP_LOCK(cif);
1501 callout_stop(&sc->sc_ad_tmo);
1502 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
1503 sc->sc_vhid = -1;
1504 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1505 imo->imo_multicast_ifp = NULL;
1506 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1507 if (!--cif->vhif_nvrs) {
1508 callout_drain(&cif->cif_tmo);
1509 sc->sc_carpdev->if_carp = NULL;
1510 CARP_LOCK_DESTROY(cif);
1511 FREE(cif, M_IFADDR);
1512 } else {
1513 CARP_UNLOCK(cif);
1514 }
1515 }
1516
1517 return (error);
1518 }
1519
1520 #ifdef INET6
1521 static int
1522 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1523 {
1524 struct ifnet *ifp;
1525 struct carp_if *cif;
1526 struct in6_ifaddr *ia, *ia_if;
1527 struct ip6_moptions *im6o = &sc->sc_im6o;
1528 struct in6_multi_mship *imm;
1529 struct sockaddr_in6 addr;
1530 int own, error;
1531
1532 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1533 if (!(sc->sc_if.if_flags & IFF_UP))
1534 carp_set_state(sc, INIT);
1535 if (sc->sc_naddrs6)
1536 sc->sc_if.if_flags |= IFF_UP;
1537 carp_setrun(sc, 0);
1538 return (0);
1539 }
1540
1541 /* we have to do it by hands to check we won't match on us */
1542 ia_if = NULL; own = 0;
1543 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1544 int i;
1545
1546 for (i = 0; i < 4; i++) {
1547 if ((sin6->sin6_addr.s6_addr32[i] &
1548 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
1549 (ia->ia_addr.sin6_addr.s6_addr32[i] &
1550 ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
1551 break;
1552 }
1553 /* and, yeah, we need a multicast-capable iface too */
1554 if (ia->ia_ifp != &sc->sc_ac.ac_if &&
1555 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1556 (i == 4)) {
1557 if (!ia_if)
1558 ia_if = ia;
1559 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
1560 &ia->ia_addr.sin6_addr))
1561 own++;
1562 }
1563 }
1564
1565 if (!ia_if)
1566 return (EADDRNOTAVAIL);
1567 ia = ia_if;
1568 ifp = ia->ia_ifp;
1569
1570 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1571 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp))
1572 return (EADDRNOTAVAIL);
1573
1574 if (!sc->sc_naddrs6) {
1575 im6o->im6o_multicast_ifp = ifp;
1576
1577 /* join CARP multicast address */
1578 bzero(&addr, sizeof(addr));
1579 addr.sin6_family = AF_INET6;
1580 addr.sin6_len = sizeof(addr);
1581 addr.sin6_addr.s6_addr16[0] = htons(0xff02);
1582 addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
1583 addr.sin6_addr.s6_addr8[15] = 0x12;
1584 if ((imm = in6_joingroup(ifp, &addr.sin6_addr, &error)) == NULL)
1585 goto cleanup;
1586 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1587
1588 /* join solicited multicast address */
1589 bzero(&addr.sin6_addr, sizeof(addr.sin6_addr));
1590 addr.sin6_addr.s6_addr16[0] = htons(0xff02);
1591 addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
1592 addr.sin6_addr.s6_addr32[1] = 0;
1593 addr.sin6_addr.s6_addr32[2] = htonl(1);
1594 addr.sin6_addr.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3];
1595 addr.sin6_addr.s6_addr8[12] = 0xff;
1596 if ((imm = in6_joingroup(ifp, &addr.sin6_addr, &error)) == NULL)
1597 goto cleanup;
1598 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1599 }
1600
1601 if (!ifp->if_carp) {
1602 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP,
1603 M_WAITOK|M_ZERO);
1604 if (!cif) {
1605 error = ENOBUFS;
1606 goto cleanup;
1607 }
1608 if ((error = ifpromisc(ifp, 1))) {
1609 FREE(cif, M_CARP);
1610 goto cleanup;
1611 }
1612
1613 CARP_LOCK_INIT(cif);
1614 CARP_LOCK(cif);
1615 cif->vhif_ifp = ifp;
1616 TAILQ_INIT(&cif->vhif_vrs);
1617 callout_init(&cif->cif_tmo, NET_CALLOUT_MPSAFE);
1618 ifp->if_carp = cif;
1619
1620 } else {
1621 struct carp_softc *vr;
1622
1623 cif = (struct carp_if *)ifp->if_carp;
1624 CARP_LOCK(cif);
1625 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1626 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1627 CARP_UNLOCK(cif);
1628 error = EINVAL;
1629 goto cleanup;
1630 }
1631 }
1632 sc->sc_ia6 = ia;
1633 sc->sc_carpdev = ifp;
1634
1635 { /* XXX prevent endless loop if already in queue */
1636 struct carp_softc *vr, *after = NULL;
1637 int myself = 0;
1638 cif = (struct carp_if *)ifp->if_carp;
1639 CARP_LOCK_ASSERT(cif);
1640
1641 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1642 if (vr == sc)
1643 myself = 1;
1644 if (vr->sc_vhid < sc->sc_vhid)
1645 after = vr;
1646 }
1647
1648 if (!myself) {
1649 /* We're trying to keep things in order */
1650 if (after == NULL) {
1651 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1652 } else {
1653 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1654 }
1655 cif->vhif_nvrs++;
1656 }
1657 }
1658
1659 sc->sc_naddrs6++;
1660 sc->sc_ac.ac_if.if_flags |= IFF_UP;
1661 if (own)
1662 sc->sc_advskew = 0;
1663 carp_sc_state_locked(sc);
1664 carp_setrun(sc, 0);
1665
1666 CARP_UNLOCK(cif);
1667
1668 return (0);
1669
1670 cleanup:
1671 /* clean up multicast memberships */
1672 if (!sc->sc_naddrs6) {
1673 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1674 imm = LIST_FIRST(&im6o->im6o_memberships);
1675 LIST_REMOVE(imm, i6mm_chain);
1676 in6_leavegroup(imm);
1677 }
1678 }
1679 return (error);
1680 }
1681
1682 static int
1683 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1684 {
1685 int error = 0;
1686
1687 if (!--sc->sc_naddrs6) {
1688 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1689 struct ip6_moptions *im6o = &sc->sc_im6o;
1690
1691 CARP_LOCK(cif);
1692 callout_stop(&sc->sc_ad_tmo);
1693 sc->sc_ac.ac_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
1694 sc->sc_vhid = -1;
1695 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1696 struct in6_multi_mship *imm =
1697 LIST_FIRST(&im6o->im6o_memberships);
1698
1699 LIST_REMOVE(imm, i6mm_chain);
1700 in6_leavegroup(imm);
1701 }
1702 im6o->im6o_multicast_ifp = NULL;
1703 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1704 if (!--cif->vhif_nvrs) {
1705 callout_drain(&cif->cif_tmo);
1706 CARP_LOCK_DESTROY(cif);
1707 sc->sc_carpdev->if_carp = NULL;
1708 FREE(cif, M_IFADDR);
1709 } else
1710 CARP_UNLOCK(cif);
1711 }
1712
1713 return (error);
1714 }
1715 #endif /* INET6 */
1716
1717 static int
1718 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr)
1719 {
1720 struct carp_softc *sc = ifp->if_softc, *vr;
1721 struct carpreq carpr;
1722 struct ifaddr *ifa;
1723 struct ifreq *ifr;
1724 struct ifaliasreq *ifra;
1725 int locked = 0, error = 0;
1726
1727 ifa = (struct ifaddr *)addr;
1728 ifra = (struct ifaliasreq *)addr;
1729 ifr = (struct ifreq *)addr;
1730
1731 switch (cmd) {
1732 case SIOCSIFADDR:
1733 switch (ifa->ifa_addr->sa_family) {
1734 #ifdef INET
1735 case AF_INET:
1736 sc->sc_if.if_flags |= IFF_UP;
1737 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1738 sizeof(struct sockaddr));
1739 error = carp_set_addr(sc, satosin(ifa->ifa_addr));
1740 break;
1741 #endif /* INET */
1742 #ifdef INET6
1743 case AF_INET6:
1744 sc->sc_if.if_flags |= IFF_UP;
1745 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr));
1746 break;
1747 #endif /* INET6 */
1748 default:
1749 error = EAFNOSUPPORT;
1750 break;
1751 }
1752 break;
1753
1754 case SIOCAIFADDR:
1755 switch (ifa->ifa_addr->sa_family) {
1756 #ifdef INET
1757 case AF_INET:
1758 sc->sc_if.if_flags |= IFF_UP;
1759 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1760 sizeof(struct sockaddr));
1761 error = carp_set_addr(sc, satosin(&ifra->ifra_addr));
1762 break;
1763 #endif /* INET */
1764 #ifdef INET6
1765 case AF_INET6:
1766 sc->sc_if.if_flags |= IFF_UP;
1767 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr));
1768 break;
1769 #endif /* INET6 */
1770 default:
1771 error = EAFNOSUPPORT;
1772 break;
1773 }
1774 break;
1775
1776 case SIOCDIFADDR:
1777 switch (ifa->ifa_addr->sa_family) {
1778 #ifdef INET
1779 case AF_INET:
1780 error = carp_del_addr(sc, satosin(&ifra->ifra_addr));
1781 break;
1782 #endif /* INET */
1783 #ifdef INET6
1784 case AF_INET6:
1785 error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr));
1786 break;
1787 #endif /* INET6 */
1788 default:
1789 error = EAFNOSUPPORT;
1790 break;
1791 }
1792 break;
1793
1794 case SIOCSIFFLAGS:
1795 if (sc->sc_carpdev) {
1796 locked = 1;
1797 CARP_SCLOCK(sc);
1798 }
1799 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) {
1800 callout_stop(&sc->sc_ad_tmo);
1801 callout_stop(&sc->sc_md_tmo);
1802 callout_stop(&sc->sc_md6_tmo);
1803 if (sc->sc_state == MASTER)
1804 carp_send_ad_locked(sc);
1805 carp_set_state(sc, INIT);
1806 carp_setrun(sc, 0);
1807 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) {
1808 sc->sc_if.if_flags |= IFF_UP;
1809 carp_setrun(sc, 0);
1810 }
1811 break;
1812
1813 case SIOCSVH:
1814 if ((error = suser(curthread)) != 0)
1815 break;
1816 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr)))
1817 break;
1818 error = 1;
1819 if (sc->sc_carpdev) {
1820 locked = 1;
1821 CARP_SCLOCK(sc);
1822 }
1823 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) {
1824 switch (carpr.carpr_state) {
1825 case BACKUP:
1826 callout_stop(&sc->sc_ad_tmo);
1827 carp_set_state(sc, BACKUP);
1828 carp_setrun(sc, 0);
1829 carp_setroute(sc, RTM_DELETE);
1830 break;
1831 case MASTER:
1832 carp_master_down_locked(sc);
1833 break;
1834 default:
1835 break;
1836 }
1837 }
1838 if (carpr.carpr_vhid > 0) {
1839 if (carpr.carpr_vhid > 255) {
1840 error = EINVAL;
1841 break;
1842 }
1843 if (sc->sc_carpdev) {
1844 struct carp_if *cif;
1845 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1846 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1847 if (vr != sc &&
1848 vr->sc_vhid == carpr.carpr_vhid)
1849 return EEXIST;
1850 }
1851 sc->sc_vhid = carpr.carpr_vhid;
1852 sc->sc_ac.ac_enaddr[0] = 0;
1853 sc->sc_ac.ac_enaddr[1] = 0;
1854 sc->sc_ac.ac_enaddr[2] = 0x5e;
1855 sc->sc_ac.ac_enaddr[3] = 0;
1856 sc->sc_ac.ac_enaddr[4] = 1;
1857 sc->sc_ac.ac_enaddr[5] = sc->sc_vhid;
1858 error--;
1859 }
1860 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) {
1861 if (carpr.carpr_advskew >= 255) {
1862 error = EINVAL;
1863 break;
1864 }
1865 if (carpr.carpr_advbase > 255) {
1866 error = EINVAL;
1867 break;
1868 }
1869 sc->sc_advbase = carpr.carpr_advbase;
1870 sc->sc_advskew = carpr.carpr_advskew;
1871 error--;
1872 }
1873 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key));
1874 if (error > 0)
1875 error = EINVAL;
1876 else {
1877 error = 0;
1878 carp_setrun(sc, 0);
1879 }
1880 break;
1881
1882 case SIOCGVH:
1883 /* XXX: lockless read */
1884 bzero(&carpr, sizeof(carpr));
1885 carpr.carpr_state = sc->sc_state;
1886 carpr.carpr_vhid = sc->sc_vhid;
1887 carpr.carpr_advbase = sc->sc_advbase;
1888 carpr.carpr_advskew = sc->sc_advskew;
1889 if (suser(curthread) == 0)
1890 bcopy(sc->sc_key, carpr.carpr_key,
1891 sizeof(carpr.carpr_key));
1892 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
1893 break;
1894
1895 default:
1896 error = EINVAL;
1897 }
1898
1899 if (locked)
1900 CARP_SCUNLOCK(sc);
1901
1902 carp_hmac_prepare(sc);
1903
1904 return (error);
1905 }
1906
1907 /*
1908 * XXX: this is looutput. We should eventually use it from there.
1909 */
1910 static int
1911 carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
1912 struct rtentry *rt)
1913 {
1914 M_ASSERTPKTHDR(m); /* check if we have the packet header */
1915
1916 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
1917 m_freem(m);
1918 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
1919 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
1920 }
1921
1922 ifp->if_opackets++;
1923 ifp->if_obytes += m->m_pkthdr.len;
1924 #if 1 /* XXX */
1925 switch (dst->sa_family) {
1926 case AF_INET:
1927 case AF_INET6:
1928 case AF_IPX:
1929 case AF_APPLETALK:
1930 break;
1931 default:
1932 printf("carp_looutput: af=%d unexpected\n", dst->sa_family);
1933 m_freem(m);
1934 return (EAFNOSUPPORT);
1935 }
1936 #endif
1937 return(if_simloop(ifp, m, dst->sa_family, 0));
1938 }
1939
1940 /*
1941 * Start output on carp interface. This function should never be called.
1942 */
1943 static void
1944 carp_start(struct ifnet *ifp)
1945 {
1946 #ifdef DEBUG
1947 printf("%s: start called\n", ifp->if_xname);
1948 #endif
1949 }
1950
1951 int
1952 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
1953 struct rtentry *rt)
1954 {
1955 struct m_tag *mtag;
1956 struct carp_softc *sc;
1957 struct ifnet *carp_ifp;
1958
1959 if (!sa)
1960 return (0);
1961
1962 switch (sa->sa_family) {
1963 #ifdef INET
1964 case AF_INET:
1965 break;
1966 #endif /* INET */
1967 #ifdef INET6
1968 case AF_INET6:
1969 break;
1970 #endif /* INET6 */
1971 default:
1972 return (0);
1973 }
1974
1975 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL);
1976 if (mtag == NULL)
1977 return (0);
1978
1979 bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *));
1980 sc = carp_ifp->if_softc;
1981
1982 /* Set the source MAC address to Virtual Router MAC Address */
1983 switch (ifp->if_type) {
1984 case IFT_ETHER:
1985 case IFT_L2VLAN: {
1986 struct ether_header *eh;
1987
1988 eh = mtod(m, struct ether_header *);
1989 eh->ether_shost[0] = 0;
1990 eh->ether_shost[1] = 0;
1991 eh->ether_shost[2] = 0x5e;
1992 eh->ether_shost[3] = 0;
1993 eh->ether_shost[4] = 1;
1994 eh->ether_shost[5] = sc->sc_vhid;
1995 }
1996 break;
1997 case IFT_FDDI: {
1998 struct fddi_header *fh;
1999
2000 fh = mtod(m, struct fddi_header *);
2001 fh->fddi_shost[0] = 0;
2002 fh->fddi_shost[1] = 0;
2003 fh->fddi_shost[2] = 0x5e;
2004 fh->fddi_shost[3] = 0;
2005 fh->fddi_shost[4] = 1;
2006 fh->fddi_shost[5] = sc->sc_vhid;
2007 }
2008 break;
2009 case IFT_ISO88025: {
2010 struct iso88025_header *th;
2011 th = mtod(m, struct iso88025_header *);
2012 th->iso88025_shost[0] = 3;
2013 th->iso88025_shost[1] = 0;
2014 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1);
2015 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1);
2016 th->iso88025_shost[4] = 0;
2017 th->iso88025_shost[5] = 0;
2018 }
2019 break;
2020 default:
2021 printf("%s: carp is not supported for this interface type\n",
2022 ifp->if_xname);
2023 return (EOPNOTSUPP);
2024 }
2025
2026 return (0);
2027 }
2028
2029 static void
2030 carp_set_state(struct carp_softc *sc, int state)
2031 {
2032
2033 if (sc->sc_carpdev)
2034 CARP_SCLOCK_ASSERT(sc);
2035
2036 if (sc->sc_state == state)
2037 return;
2038
2039 sc->sc_state = state;
2040 switch (state) {
2041 case BACKUP:
2042 sc->sc_ac.ac_if.if_link_state = LINK_STATE_DOWN;
2043 break;
2044 case MASTER:
2045 sc->sc_ac.ac_if.if_link_state = LINK_STATE_UP;
2046 break;
2047 default:
2048 sc->sc_ac.ac_if.if_link_state = LINK_STATE_UNKNOWN;
2049 break;
2050 }
2051 rt_ifmsg(&sc->sc_ac.ac_if);
2052 }
2053
2054 void
2055 carp_carpdev_state(void *v)
2056 {
2057 struct carp_if *cif = v;
2058
2059 /*
2060 * We came here from interrupt handler of network
2061 * card. To avoid multiple LORs, we will queue function
2062 * for later.
2063 */
2064
2065 callout_reset(&cif->cif_tmo, 1, carp_carpdev_state1, v);
2066 }
2067
2068 void
2069 carp_carpdev_state1(void *v)
2070 {
2071 struct carp_if *cif = v;
2072
2073 CARP_LOCK(cif);
2074 carp_carpdev_state_locked(cif);
2075 CARP_UNLOCK(cif);
2076 }
2077
2078 static void
2079 carp_carpdev_state_locked(struct carp_if *cif)
2080 {
2081 struct carp_softc *sc;
2082
2083 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
2084 carp_sc_state_locked(sc);
2085 }
2086
2087 static void
2088 carp_sc_state_locked(struct carp_softc *sc)
2089 {
2090 CARP_SCLOCK_ASSERT(sc);
2091
2092 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP ||
2093 !(sc->sc_carpdev->if_flags & IFF_UP)) {
2094 sc->sc_flags_backup = sc->sc_if.if_flags;
2095 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
2096 callout_stop(&sc->sc_ad_tmo);
2097 callout_stop(&sc->sc_md_tmo);
2098 callout_stop(&sc->sc_md6_tmo);
2099 carp_set_state(sc, INIT);
2100 carp_setrun(sc, 0);
2101 if (!sc->sc_suppress) {
2102 carp_suppress_preempt++;
2103 if (carp_suppress_preempt == 1) {
2104 CARP_SCUNLOCK(sc);
2105 carp_send_ad_all();
2106 CARP_SCLOCK(sc);
2107 }
2108 }
2109 sc->sc_suppress = 1;
2110 } else {
2111 sc->sc_if.if_flags |= sc->sc_flags_backup;
2112 carp_set_state(sc, INIT);
2113 carp_setrun(sc, 0);
2114 if (sc->sc_suppress)
2115 carp_suppress_preempt--;
2116 sc->sc_suppress = 0;
2117 }
2118
2119 return;
2120 }
2121
2122 static int
2123 carp_modevent(module_t mod, int type, void *data)
2124 {
2125 int error = 0;
2126
2127 switch (type) {
2128 case MOD_LOAD:
2129 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF);
2130 LIST_INIT(&carpif_list);
2131 if_clone_attach(&carp_cloner);
2132 break;
2133
2134 case MOD_UNLOAD:
2135 if_clone_detach(&carp_cloner);
2136 while (!LIST_EMPTY(&carpif_list))
2137 carp_clone_destroy(&LIST_FIRST(&carpif_list)->sc_if);
2138 mtx_destroy(&carp_mtx);
2139 break;
2140
2141 default:
2142 error = EINVAL;
2143 break;
2144 }
2145
2146 return error;
2147 }
2148
2149 static moduledata_t carp_mod = {
2150 "carp",
2151 carp_modevent,
2152 0
2153 };
2154
2155 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
Cache object: 69cb47576a31e7d9b6936bdfba67a9c5
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