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;
245 #ifdef INET6
246 struct in6_addr in6;
247 #endif
248
249 if (sc->sc_carpdev)
250 CARP_SCLOCK(sc);
251
252 /* XXX: possible race here */
253
254 /* compute ipad from key */
255 bzero(sc->sc_pad, sizeof(sc->sc_pad));
256 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
257 for (i = 0; i < sizeof(sc->sc_pad); i++)
258 sc->sc_pad[i] ^= 0x36;
259
260 /* precompute first part of inner hash */
261 SHA1Init(&sc->sc_sha1);
262 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
263 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
264 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
265 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
266 #ifdef INET
267 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
268 if (ifa->ifa_addr->sa_family == AF_INET)
269 SHA1Update(&sc->sc_sha1,
270 (void *)&ifatoia(ifa)->ia_addr.sin_addr.s_addr,
271 sizeof(struct in_addr));
272 }
273 #endif /* INET */
274 #ifdef INET6
275 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
276 if (ifa->ifa_addr->sa_family == AF_INET6) {
277 in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
278 in6_clearscope(&in6);
279 SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6));
280 }
281 }
282 #endif /* INET6 */
283
284 /* convert ipad to opad */
285 for (i = 0; i < sizeof(sc->sc_pad); i++)
286 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
287
288 if (sc->sc_carpdev)
289 CARP_SCUNLOCK(sc);
290 }
291
292 static void
293 carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2],
294 unsigned char md[20])
295 {
296 SHA1_CTX sha1ctx;
297
298 /* fetch first half of inner hash */
299 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
300
301 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
302 SHA1Final(md, &sha1ctx);
303
304 /* outer hash */
305 SHA1Init(&sha1ctx);
306 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
307 SHA1Update(&sha1ctx, md, 20);
308 SHA1Final(md, &sha1ctx);
309 }
310
311 static int
312 carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2],
313 unsigned char md[20])
314 {
315 unsigned char md2[20];
316
317 CARP_SCLOCK_ASSERT(sc);
318
319 carp_hmac_generate(sc, counter, md2);
320
321 return (bcmp(md, md2, sizeof(md2)));
322 }
323
324 static void
325 carp_setroute(struct carp_softc *sc, int cmd)
326 {
327 struct ifaddr *ifa;
328 int s;
329
330 if (sc->sc_carpdev)
331 CARP_SCLOCK_ASSERT(sc);
332
333 s = splnet();
334 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
335 if (ifa->ifa_addr->sa_family == AF_INET &&
336 sc->sc_carpdev != NULL) {
337 int count = carp_addrcount(
338 (struct carp_if *)sc->sc_carpdev->if_carp,
339 ifatoia(ifa), CARP_COUNT_MASTER);
340
341 if ((cmd == RTM_ADD && count == 1) ||
342 (cmd == RTM_DELETE && count == 0))
343 rtinit(ifa, cmd, RTF_UP | RTF_HOST);
344 }
345 #ifdef INET6
346 if (ifa->ifa_addr->sa_family == AF_INET6) {
347 if (cmd == RTM_ADD)
348 in6_ifaddloop(ifa);
349 else
350 in6_ifremloop(ifa);
351 }
352 #endif /* INET6 */
353 }
354 splx(s);
355 }
356
357 static int
358 carp_clone_create(struct if_clone *ifc, int unit, caddr_t params)
359 {
360
361 struct carp_softc *sc;
362 struct ifnet *ifp;
363
364 MALLOC(sc, struct carp_softc *, sizeof(*sc), M_CARP, M_WAITOK|M_ZERO);
365 ifp = SC2IFP(sc) = if_alloc(IFT_ETHER);
366 if (ifp == NULL) {
367 FREE(sc, M_CARP);
368 return (ENOSPC);
369 }
370
371 sc->sc_flags_backup = 0;
372 sc->sc_suppress = 0;
373 sc->sc_advbase = CARP_DFLTINTV;
374 sc->sc_vhid = -1; /* required setting */
375 sc->sc_advskew = 0;
376 sc->sc_init_counter = 1;
377 sc->sc_naddrs = sc->sc_naddrs6 = 0; /* M_ZERO? */
378 #ifdef INET6
379 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
380 #endif
381 sc->sc_imo.imo_membership = (struct in_multi **)malloc(
382 (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP,
383 M_WAITOK);
384 sc->sc_imo.imo_mfilters = NULL;
385 sc->sc_imo.imo_max_memberships = IP_MIN_MEMBERSHIPS;
386 sc->sc_imo.imo_multicast_vif = -1;
387
388 callout_init(&sc->sc_ad_tmo, CALLOUT_MPSAFE);
389 callout_init(&sc->sc_md_tmo, CALLOUT_MPSAFE);
390 callout_init(&sc->sc_md6_tmo, CALLOUT_MPSAFE);
391
392 ifp->if_softc = sc;
393 if_initname(ifp, CARP_IFNAME, unit);
394 ifp->if_mtu = ETHERMTU;
395 ifp->if_flags = IFF_LOOPBACK;
396 ifp->if_ioctl = carp_ioctl;
397 ifp->if_output = carp_looutput;
398 ifp->if_start = carp_start;
399 ifp->if_type = IFT_CARP;
400 ifp->if_snd.ifq_maxlen = ifqmaxlen;
401 ifp->if_hdrlen = 0;
402 if_attach(ifp);
403 bpfattach(SC2IFP(sc), DLT_NULL, sizeof(u_int32_t));
404 mtx_lock(&carp_mtx);
405 LIST_INSERT_HEAD(&carpif_list, sc, sc_next);
406 mtx_unlock(&carp_mtx);
407 return (0);
408 }
409
410 static void
411 carp_clone_destroy(struct ifnet *ifp)
412 {
413 struct carp_softc *sc = ifp->if_softc;
414
415 if (sc->sc_carpdev)
416 CARP_SCLOCK(sc);
417 carpdetach(sc, 1); /* Returns unlocked. */
418
419 mtx_lock(&carp_mtx);
420 LIST_REMOVE(sc, sc_next);
421 mtx_unlock(&carp_mtx);
422 bpfdetach(ifp);
423 if_detach(ifp);
424 if_free_type(ifp, IFT_ETHER);
425 free(sc->sc_imo.imo_membership, M_CARP);
426 free(sc, M_CARP);
427 }
428
429 /*
430 * This function can be called on CARP interface destroy path,
431 * and in case of the removal of the underlying interface as
432 * well. We differentiate these two cases. In the latter case
433 * we do not cleanup our multicast memberships, since they
434 * are already freed. Also, in the latter case we do not
435 * release the lock on return, because the function will be
436 * called once more, for another CARP instance on the same
437 * interface.
438 */
439 static void
440 carpdetach(struct carp_softc *sc, int unlock)
441 {
442 struct carp_if *cif;
443
444 callout_stop(&sc->sc_ad_tmo);
445 callout_stop(&sc->sc_md_tmo);
446 callout_stop(&sc->sc_md6_tmo);
447
448 if (sc->sc_suppress)
449 carp_suppress_preempt--;
450 sc->sc_suppress = 0;
451
452 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
453 carp_suppress_preempt--;
454 sc->sc_sendad_errors = 0;
455
456 carp_set_state(sc, INIT);
457 SC2IFP(sc)->if_flags &= ~IFF_UP;
458 carp_setrun(sc, 0);
459 if (unlock)
460 carp_multicast_cleanup(sc);
461 #ifdef INET6
462 carp_multicast6_cleanup(sc);
463 #endif
464
465 if (sc->sc_carpdev != NULL) {
466 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
467 CARP_LOCK_ASSERT(cif);
468 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
469 if (!--cif->vhif_nvrs) {
470 ifpromisc(sc->sc_carpdev, 0);
471 sc->sc_carpdev->if_carp = NULL;
472 CARP_LOCK_DESTROY(cif);
473 FREE(cif, M_IFADDR);
474 } else if (unlock)
475 CARP_UNLOCK(cif);
476 sc->sc_carpdev = NULL;
477 }
478 }
479
480 /* Detach an interface from the carp. */
481 static void
482 carp_ifdetach(void *arg __unused, struct ifnet *ifp)
483 {
484 struct carp_if *cif = (struct carp_if *)ifp->if_carp;
485 struct carp_softc *sc, *nextsc;
486
487 if (cif == NULL)
488 return;
489
490 /*
491 * XXX: At the end of for() cycle the lock will be destroyed.
492 */
493 CARP_LOCK(cif);
494 for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) {
495 nextsc = TAILQ_NEXT(sc, sc_list);
496 carpdetach(sc, 0);
497 }
498 }
499
500 /*
501 * process input packet.
502 * we have rearranged checks order compared to the rfc,
503 * but it seems more efficient this way or not possible otherwise.
504 */
505 void
506 carp_input(struct mbuf *m, int hlen)
507 {
508 struct ip *ip = mtod(m, struct ip *);
509 struct carp_header *ch;
510 int iplen, len;
511
512 carpstats.carps_ipackets++;
513
514 if (!carp_opts[CARPCTL_ALLOW]) {
515 m_freem(m);
516 return;
517 }
518
519 /* check if received on a valid carp interface */
520 if (m->m_pkthdr.rcvif->if_carp == NULL) {
521 carpstats.carps_badif++;
522 CARP_LOG("carp_input: packet received on non-carp "
523 "interface: %s\n",
524 m->m_pkthdr.rcvif->if_xname);
525 m_freem(m);
526 return;
527 }
528
529 /* verify that the IP TTL is 255. */
530 if (ip->ip_ttl != CARP_DFLTTL) {
531 carpstats.carps_badttl++;
532 CARP_LOG("carp_input: received ttl %d != 255i on %s\n",
533 ip->ip_ttl,
534 m->m_pkthdr.rcvif->if_xname);
535 m_freem(m);
536 return;
537 }
538
539 iplen = ip->ip_hl << 2;
540
541 if (m->m_pkthdr.len < iplen + sizeof(*ch)) {
542 carpstats.carps_badlen++;
543 CARP_LOG("carp_input: received len %zd < "
544 "sizeof(struct carp_header)\n",
545 m->m_len - sizeof(struct ip));
546 m_freem(m);
547 return;
548 }
549
550 if (iplen + sizeof(*ch) < m->m_len) {
551 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) {
552 carpstats.carps_hdrops++;
553 CARP_LOG("carp_input: pullup failed\n");
554 return;
555 }
556 ip = mtod(m, struct ip *);
557 }
558 ch = (struct carp_header *)((char *)ip + iplen);
559
560 /*
561 * verify that the received packet length is
562 * equal to the CARP header
563 */
564 len = iplen + sizeof(*ch);
565 if (len > m->m_pkthdr.len) {
566 carpstats.carps_badlen++;
567 CARP_LOG("carp_input: packet too short %d on %s\n",
568 m->m_pkthdr.len,
569 m->m_pkthdr.rcvif->if_xname);
570 m_freem(m);
571 return;
572 }
573
574 if ((m = m_pullup(m, len)) == NULL) {
575 carpstats.carps_hdrops++;
576 return;
577 }
578 ip = mtod(m, struct ip *);
579 ch = (struct carp_header *)((char *)ip + iplen);
580
581 /* verify the CARP checksum */
582 m->m_data += iplen;
583 if (carp_cksum(m, len - iplen)) {
584 carpstats.carps_badsum++;
585 CARP_LOG("carp_input: checksum failed on %s\n",
586 m->m_pkthdr.rcvif->if_xname);
587 m_freem(m);
588 return;
589 }
590 m->m_data -= iplen;
591
592 carp_input_c(m, ch, AF_INET);
593 }
594
595 #ifdef INET6
596 int
597 carp6_input(struct mbuf **mp, int *offp, int proto)
598 {
599 struct mbuf *m = *mp;
600 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
601 struct carp_header *ch;
602 u_int len;
603
604 carpstats.carps_ipackets6++;
605
606 if (!carp_opts[CARPCTL_ALLOW]) {
607 m_freem(m);
608 return (IPPROTO_DONE);
609 }
610
611 /* check if received on a valid carp interface */
612 if (m->m_pkthdr.rcvif->if_carp == NULL) {
613 carpstats.carps_badif++;
614 CARP_LOG("carp6_input: packet received on non-carp "
615 "interface: %s\n",
616 m->m_pkthdr.rcvif->if_xname);
617 m_freem(m);
618 return (IPPROTO_DONE);
619 }
620
621 /* verify that the IP TTL is 255 */
622 if (ip6->ip6_hlim != CARP_DFLTTL) {
623 carpstats.carps_badttl++;
624 CARP_LOG("carp6_input: received ttl %d != 255 on %s\n",
625 ip6->ip6_hlim,
626 m->m_pkthdr.rcvif->if_xname);
627 m_freem(m);
628 return (IPPROTO_DONE);
629 }
630
631 /* verify that we have a complete carp packet */
632 len = m->m_len;
633 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
634 if (ch == NULL) {
635 carpstats.carps_badlen++;
636 CARP_LOG("carp6_input: packet size %u too small\n", len);
637 return (IPPROTO_DONE);
638 }
639
640
641 /* verify the CARP checksum */
642 m->m_data += *offp;
643 if (carp_cksum(m, sizeof(*ch))) {
644 carpstats.carps_badsum++;
645 CARP_LOG("carp6_input: checksum failed, on %s\n",
646 m->m_pkthdr.rcvif->if_xname);
647 m_freem(m);
648 return (IPPROTO_DONE);
649 }
650 m->m_data -= *offp;
651
652 carp_input_c(m, ch, AF_INET6);
653 return (IPPROTO_DONE);
654 }
655 #endif /* INET6 */
656
657 static void
658 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af)
659 {
660 struct ifnet *ifp = m->m_pkthdr.rcvif;
661 struct carp_softc *sc;
662 u_int64_t tmp_counter;
663 struct timeval sc_tv, ch_tv;
664
665 /* verify that the VHID is valid on the receiving interface */
666 CARP_LOCK(ifp->if_carp);
667 TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list)
668 if (sc->sc_vhid == ch->carp_vhid)
669 break;
670
671 if (!sc || !((SC2IFP(sc)->if_flags & IFF_UP) &&
672 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) {
673 carpstats.carps_badvhid++;
674 CARP_UNLOCK(ifp->if_carp);
675 m_freem(m);
676 return;
677 }
678
679 getmicrotime(&SC2IFP(sc)->if_lastchange);
680 SC2IFP(sc)->if_ipackets++;
681 SC2IFP(sc)->if_ibytes += m->m_pkthdr.len;
682
683 if (bpf_peers_present(SC2IFP(sc)->if_bpf)) {
684 struct ip *ip = mtod(m, struct ip *);
685 uint32_t af1 = af;
686
687 /* BPF wants net byte order */
688 ip->ip_len = htons(ip->ip_len + (ip->ip_hl << 2));
689 ip->ip_off = htons(ip->ip_off);
690 bpf_mtap2(SC2IFP(sc)->if_bpf, &af1, sizeof(af1), m);
691 }
692
693 /* verify the CARP version. */
694 if (ch->carp_version != CARP_VERSION) {
695 carpstats.carps_badver++;
696 SC2IFP(sc)->if_ierrors++;
697 CARP_UNLOCK(ifp->if_carp);
698 CARP_LOG("%s; invalid version %d\n",
699 SC2IFP(sc)->if_xname,
700 ch->carp_version);
701 m_freem(m);
702 return;
703 }
704
705 /* verify the hash */
706 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
707 carpstats.carps_badauth++;
708 SC2IFP(sc)->if_ierrors++;
709 CARP_UNLOCK(ifp->if_carp);
710 CARP_LOG("%s: incorrect hash\n", SC2IFP(sc)->if_xname);
711 m_freem(m);
712 return;
713 }
714
715 tmp_counter = ntohl(ch->carp_counter[0]);
716 tmp_counter = tmp_counter<<32;
717 tmp_counter += ntohl(ch->carp_counter[1]);
718
719 /* XXX Replay protection goes here */
720
721 sc->sc_init_counter = 0;
722 sc->sc_counter = tmp_counter;
723
724 sc_tv.tv_sec = sc->sc_advbase;
725 if (carp_suppress_preempt && sc->sc_advskew < 240)
726 sc_tv.tv_usec = 240 * 1000000 / 256;
727 else
728 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256;
729 ch_tv.tv_sec = ch->carp_advbase;
730 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
731
732 switch (sc->sc_state) {
733 case INIT:
734 break;
735 case MASTER:
736 /*
737 * If we receive an advertisement from a master who's going to
738 * be more frequent than us, go into BACKUP state.
739 */
740 if (timevalcmp(&sc_tv, &ch_tv, >) ||
741 timevalcmp(&sc_tv, &ch_tv, ==)) {
742 callout_stop(&sc->sc_ad_tmo);
743 CARP_DEBUG("%s: MASTER -> BACKUP "
744 "(more frequent advertisement received)\n",
745 SC2IFP(sc)->if_xname);
746 carp_set_state(sc, BACKUP);
747 carp_setrun(sc, 0);
748 carp_setroute(sc, RTM_DELETE);
749 }
750 break;
751 case BACKUP:
752 /*
753 * If we're pre-empting masters who advertise slower than us,
754 * and this one claims to be slower, treat him as down.
755 */
756 if (carp_opts[CARPCTL_PREEMPT] &&
757 timevalcmp(&sc_tv, &ch_tv, <)) {
758 CARP_DEBUG("%s: BACKUP -> MASTER "
759 "(preempting a slower master)\n",
760 SC2IFP(sc)->if_xname);
761 carp_master_down_locked(sc);
762 break;
763 }
764
765 /*
766 * If the master is going to advertise at such a low frequency
767 * that he's guaranteed to time out, we'd might as well just
768 * treat him as timed out now.
769 */
770 sc_tv.tv_sec = sc->sc_advbase * 3;
771 if (timevalcmp(&sc_tv, &ch_tv, <)) {
772 CARP_DEBUG("%s: BACKUP -> MASTER "
773 "(master timed out)\n",
774 SC2IFP(sc)->if_xname);
775 carp_master_down_locked(sc);
776 break;
777 }
778
779 /*
780 * Otherwise, we reset the counter and wait for the next
781 * advertisement.
782 */
783 carp_setrun(sc, af);
784 break;
785 }
786
787 CARP_UNLOCK(ifp->if_carp);
788
789 m_freem(m);
790 return;
791 }
792
793 static int
794 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch)
795 {
796 struct m_tag *mtag;
797 struct ifnet *ifp = SC2IFP(sc);
798
799 if (sc->sc_init_counter) {
800 /* this could also be seconds since unix epoch */
801 sc->sc_counter = arc4random();
802 sc->sc_counter = sc->sc_counter << 32;
803 sc->sc_counter += arc4random();
804 } else
805 sc->sc_counter++;
806
807 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff);
808 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff);
809
810 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
811
812 /* Tag packet for carp_output */
813 mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct ifnet *), M_NOWAIT);
814 if (mtag == NULL) {
815 m_freem(m);
816 SC2IFP(sc)->if_oerrors++;
817 return (ENOMEM);
818 }
819 bcopy(&ifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *));
820 m_tag_prepend(m, mtag);
821
822 return (0);
823 }
824
825 static void
826 carp_send_ad_all(void)
827 {
828 struct carp_softc *sc;
829
830 mtx_lock(&carp_mtx);
831 LIST_FOREACH(sc, &carpif_list, sc_next) {
832 if (sc->sc_carpdev == NULL)
833 continue;
834 CARP_SCLOCK(sc);
835 if ((SC2IFP(sc)->if_flags & IFF_UP) &&
836 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING) &&
837 sc->sc_state == MASTER)
838 carp_send_ad_locked(sc);
839 CARP_SCUNLOCK(sc);
840 }
841 mtx_unlock(&carp_mtx);
842 }
843
844 static void
845 carp_send_ad(void *v)
846 {
847 struct carp_softc *sc = v;
848
849 CARP_SCLOCK(sc);
850 carp_send_ad_locked(sc);
851 CARP_SCUNLOCK(sc);
852 }
853
854 static void
855 carp_send_ad_locked(struct carp_softc *sc)
856 {
857 struct carp_header ch;
858 struct timeval tv;
859 struct carp_header *ch_ptr;
860 struct mbuf *m;
861 int len, advbase, advskew;
862
863 CARP_SCLOCK_ASSERT(sc);
864
865 /* bow out if we've lost our UPness or RUNNINGuiness */
866 if (!((SC2IFP(sc)->if_flags & IFF_UP) &&
867 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) {
868 advbase = 255;
869 advskew = 255;
870 } else {
871 advbase = sc->sc_advbase;
872 if (!carp_suppress_preempt || sc->sc_advskew > 240)
873 advskew = sc->sc_advskew;
874 else
875 advskew = 240;
876 tv.tv_sec = advbase;
877 tv.tv_usec = advskew * 1000000 / 256;
878 }
879
880 ch.carp_version = CARP_VERSION;
881 ch.carp_type = CARP_ADVERTISEMENT;
882 ch.carp_vhid = sc->sc_vhid;
883 ch.carp_advbase = advbase;
884 ch.carp_advskew = advskew;
885 ch.carp_authlen = 7; /* XXX DEFINE */
886 ch.carp_pad1 = 0; /* must be zero */
887 ch.carp_cksum = 0;
888
889 #ifdef INET
890 if (sc->sc_ia) {
891 struct ip *ip;
892
893 MGETHDR(m, M_DONTWAIT, MT_HEADER);
894 if (m == NULL) {
895 SC2IFP(sc)->if_oerrors++;
896 carpstats.carps_onomem++;
897 /* XXX maybe less ? */
898 if (advbase != 255 || advskew != 255)
899 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
900 carp_send_ad, sc);
901 return;
902 }
903 len = sizeof(*ip) + sizeof(ch);
904 m->m_pkthdr.len = len;
905 m->m_pkthdr.rcvif = NULL;
906 m->m_len = len;
907 MH_ALIGN(m, m->m_len);
908 m->m_flags |= M_MCAST;
909 ip = mtod(m, struct ip *);
910 ip->ip_v = IPVERSION;
911 ip->ip_hl = sizeof(*ip) >> 2;
912 ip->ip_tos = IPTOS_LOWDELAY;
913 ip->ip_len = len;
914 ip->ip_id = ip_newid();
915 ip->ip_off = IP_DF;
916 ip->ip_ttl = CARP_DFLTTL;
917 ip->ip_p = IPPROTO_CARP;
918 ip->ip_sum = 0;
919 ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr;
920 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
921
922 ch_ptr = (struct carp_header *)(&ip[1]);
923 bcopy(&ch, ch_ptr, sizeof(ch));
924 if (carp_prepare_ad(m, sc, ch_ptr))
925 return;
926
927 m->m_data += sizeof(*ip);
928 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip));
929 m->m_data -= sizeof(*ip);
930
931 getmicrotime(&SC2IFP(sc)->if_lastchange);
932 SC2IFP(sc)->if_opackets++;
933 SC2IFP(sc)->if_obytes += len;
934 carpstats.carps_opackets++;
935
936 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) {
937 SC2IFP(sc)->if_oerrors++;
938 if (sc->sc_sendad_errors < INT_MAX)
939 sc->sc_sendad_errors++;
940 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
941 carp_suppress_preempt++;
942 if (carp_suppress_preempt == 1) {
943 CARP_SCUNLOCK(sc);
944 carp_send_ad_all();
945 CARP_SCLOCK(sc);
946 }
947 }
948 sc->sc_sendad_success = 0;
949 } else {
950 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
951 if (++sc->sc_sendad_success >=
952 CARP_SENDAD_MIN_SUCCESS) {
953 carp_suppress_preempt--;
954 sc->sc_sendad_errors = 0;
955 }
956 } else
957 sc->sc_sendad_errors = 0;
958 }
959 }
960 #endif /* INET */
961 #ifdef INET6
962 if (sc->sc_ia6) {
963 struct ip6_hdr *ip6;
964
965 MGETHDR(m, M_DONTWAIT, MT_HEADER);
966 if (m == NULL) {
967 SC2IFP(sc)->if_oerrors++;
968 carpstats.carps_onomem++;
969 /* XXX maybe less ? */
970 if (advbase != 255 || advskew != 255)
971 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
972 carp_send_ad, sc);
973 return;
974 }
975 len = sizeof(*ip6) + sizeof(ch);
976 m->m_pkthdr.len = len;
977 m->m_pkthdr.rcvif = NULL;
978 m->m_len = len;
979 MH_ALIGN(m, m->m_len);
980 m->m_flags |= M_MCAST;
981 ip6 = mtod(m, struct ip6_hdr *);
982 bzero(ip6, sizeof(*ip6));
983 ip6->ip6_vfc |= IPV6_VERSION;
984 ip6->ip6_hlim = CARP_DFLTTL;
985 ip6->ip6_nxt = IPPROTO_CARP;
986 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src,
987 sizeof(struct in6_addr));
988 /* set the multicast destination */
989
990 ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
991 ip6->ip6_dst.s6_addr8[15] = 0x12;
992 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
993 SC2IFP(sc)->if_oerrors++;
994 m_freem(m);
995 CARP_LOG("%s: in6_setscope failed\n", __func__);
996 return;
997 }
998
999 ch_ptr = (struct carp_header *)(&ip6[1]);
1000 bcopy(&ch, ch_ptr, sizeof(ch));
1001 if (carp_prepare_ad(m, sc, ch_ptr))
1002 return;
1003
1004 m->m_data += sizeof(*ip6);
1005 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6));
1006 m->m_data -= sizeof(*ip6);
1007
1008 getmicrotime(&SC2IFP(sc)->if_lastchange);
1009 SC2IFP(sc)->if_opackets++;
1010 SC2IFP(sc)->if_obytes += len;
1011 carpstats.carps_opackets6++;
1012
1013 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) {
1014 SC2IFP(sc)->if_oerrors++;
1015 if (sc->sc_sendad_errors < INT_MAX)
1016 sc->sc_sendad_errors++;
1017 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1018 carp_suppress_preempt++;
1019 if (carp_suppress_preempt == 1) {
1020 CARP_SCUNLOCK(sc);
1021 carp_send_ad_all();
1022 CARP_SCLOCK(sc);
1023 }
1024 }
1025 sc->sc_sendad_success = 0;
1026 } else {
1027 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1028 if (++sc->sc_sendad_success >=
1029 CARP_SENDAD_MIN_SUCCESS) {
1030 carp_suppress_preempt--;
1031 sc->sc_sendad_errors = 0;
1032 }
1033 } else
1034 sc->sc_sendad_errors = 0;
1035 }
1036 }
1037 #endif /* INET6 */
1038
1039 if (advbase != 255 || advskew != 255)
1040 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1041 carp_send_ad, sc);
1042
1043 }
1044
1045 /*
1046 * Broadcast a gratuitous ARP request containing
1047 * the virtual router MAC address for each IP address
1048 * associated with the virtual router.
1049 */
1050 static void
1051 carp_send_arp(struct carp_softc *sc)
1052 {
1053 struct ifaddr *ifa;
1054
1055 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1056
1057 if (ifa->ifa_addr->sa_family != AF_INET)
1058 continue;
1059
1060 /* arprequest(sc->sc_carpdev, &in, &in, IF_LLADDR(sc->sc_ifp)); */
1061 arp_ifinit2(sc->sc_carpdev, ifa, IF_LLADDR(sc->sc_ifp));
1062
1063 DELAY(1000); /* XXX */
1064 }
1065 }
1066
1067 #ifdef INET6
1068 static void
1069 carp_send_na(struct carp_softc *sc)
1070 {
1071 struct ifaddr *ifa;
1072 struct in6_addr *in6;
1073 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1074
1075 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1076
1077 if (ifa->ifa_addr->sa_family != AF_INET6)
1078 continue;
1079
1080 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
1081 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1082 ND_NA_FLAG_OVERRIDE, 1, NULL);
1083 DELAY(1000); /* XXX */
1084 }
1085 }
1086 #endif /* INET6 */
1087
1088 static int
1089 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type)
1090 {
1091 struct carp_softc *vh;
1092 struct ifaddr *ifa;
1093 int count = 0;
1094
1095 CARP_LOCK_ASSERT(cif);
1096
1097 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1098 if ((type == CARP_COUNT_RUNNING &&
1099 (SC2IFP(vh)->if_flags & IFF_UP) &&
1100 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) ||
1101 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) {
1102 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist,
1103 ifa_list) {
1104 if (ifa->ifa_addr->sa_family == AF_INET &&
1105 ia->ia_addr.sin_addr.s_addr ==
1106 ifatoia(ifa)->ia_addr.sin_addr.s_addr)
1107 count++;
1108 }
1109 }
1110 }
1111 return (count);
1112 }
1113
1114 int
1115 carp_iamatch(void *v, struct in_ifaddr *ia,
1116 struct in_addr *isaddr, u_int8_t **enaddr)
1117 {
1118 struct carp_if *cif = v;
1119 struct carp_softc *vh;
1120 int index, count = 0;
1121 struct ifaddr *ifa;
1122
1123 CARP_LOCK(cif);
1124
1125 if (carp_opts[CARPCTL_ARPBALANCE]) {
1126 /*
1127 * XXX proof of concept implementation.
1128 * We use the source ip to decide which virtual host should
1129 * handle the request. If we're master of that virtual host,
1130 * then we respond, otherwise, just drop the arp packet on
1131 * the floor.
1132 */
1133 count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING);
1134 if (count == 0) {
1135 /* should never reach this */
1136 CARP_UNLOCK(cif);
1137 return (0);
1138 }
1139
1140 /* this should be a hash, like pf_hash() */
1141 index = ntohl(isaddr->s_addr) % count;
1142 count = 0;
1143
1144 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1145 if ((SC2IFP(vh)->if_flags & IFF_UP) &&
1146 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) {
1147 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist,
1148 ifa_list) {
1149 if (ifa->ifa_addr->sa_family ==
1150 AF_INET &&
1151 ia->ia_addr.sin_addr.s_addr ==
1152 ifatoia(ifa)->ia_addr.sin_addr.s_addr) {
1153 if (count == index) {
1154 if (vh->sc_state ==
1155 MASTER) {
1156 *enaddr = IF_LLADDR(vh->sc_ifp);
1157 CARP_UNLOCK(cif);
1158 return (1);
1159 } else {
1160 CARP_UNLOCK(cif);
1161 return (0);
1162 }
1163 }
1164 count++;
1165 }
1166 }
1167 }
1168 }
1169 } else {
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 ia->ia_ifp == SC2IFP(vh) &&
1174 vh->sc_state == MASTER) {
1175 *enaddr = IF_LLADDR(vh->sc_ifp);
1176 CARP_UNLOCK(cif);
1177 return (1);
1178 }
1179 }
1180 }
1181 CARP_UNLOCK(cif);
1182 return (0);
1183 }
1184
1185 #ifdef INET6
1186 struct ifaddr *
1187 carp_iamatch6(void *v, struct in6_addr *taddr)
1188 {
1189 struct carp_if *cif = v;
1190 struct carp_softc *vh;
1191 struct ifaddr *ifa;
1192
1193 CARP_LOCK(cif);
1194 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1195 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, ifa_list) {
1196 if (IN6_ARE_ADDR_EQUAL(taddr,
1197 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1198 (SC2IFP(vh)->if_flags & IFF_UP) &&
1199 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
1200 vh->sc_state == MASTER) {
1201 CARP_UNLOCK(cif);
1202 return (ifa);
1203 }
1204 }
1205 }
1206 CARP_UNLOCK(cif);
1207
1208 return (NULL);
1209 }
1210
1211 void *
1212 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr)
1213 {
1214 struct m_tag *mtag;
1215 struct carp_if *cif = v;
1216 struct carp_softc *sc;
1217 struct ifaddr *ifa;
1218
1219 CARP_LOCK(cif);
1220 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
1221 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1222 if (IN6_ARE_ADDR_EQUAL(taddr,
1223 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1224 (SC2IFP(sc)->if_flags & IFF_UP) &&
1225 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING)) {
1226 struct ifnet *ifp = SC2IFP(sc);
1227 mtag = m_tag_get(PACKET_TAG_CARP,
1228 sizeof(struct ifnet *), M_NOWAIT);
1229 if (mtag == NULL) {
1230 /* better a bit than nothing */
1231 CARP_UNLOCK(cif);
1232 return (IF_LLADDR(sc->sc_ifp));
1233 }
1234 bcopy(&ifp, (caddr_t)(mtag + 1),
1235 sizeof(struct ifnet *));
1236 m_tag_prepend(m, mtag);
1237
1238 CARP_UNLOCK(cif);
1239 return (IF_LLADDR(sc->sc_ifp));
1240 }
1241 }
1242 }
1243 CARP_UNLOCK(cif);
1244
1245 return (NULL);
1246 }
1247 #endif
1248
1249 struct ifnet *
1250 carp_forus(void *v, void *dhost)
1251 {
1252 struct carp_if *cif = v;
1253 struct carp_softc *vh;
1254 u_int8_t *ena = dhost;
1255
1256 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
1257 return (NULL);
1258
1259 CARP_LOCK(cif);
1260 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list)
1261 if ((SC2IFP(vh)->if_flags & IFF_UP) &&
1262 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
1263 vh->sc_state == MASTER &&
1264 !bcmp(dhost, IF_LLADDR(vh->sc_ifp), ETHER_ADDR_LEN)) {
1265 CARP_UNLOCK(cif);
1266 return (SC2IFP(vh));
1267 }
1268
1269 CARP_UNLOCK(cif);
1270 return (NULL);
1271 }
1272
1273 static void
1274 carp_master_down(void *v)
1275 {
1276 struct carp_softc *sc = v;
1277
1278 CARP_SCLOCK(sc);
1279 carp_master_down_locked(sc);
1280 CARP_SCUNLOCK(sc);
1281 }
1282
1283 static void
1284 carp_master_down_locked(struct carp_softc *sc)
1285 {
1286 if (sc->sc_carpdev)
1287 CARP_SCLOCK_ASSERT(sc);
1288
1289 switch (sc->sc_state) {
1290 case INIT:
1291 printf("%s: master_down event in INIT state\n",
1292 SC2IFP(sc)->if_xname);
1293 break;
1294 case MASTER:
1295 break;
1296 case BACKUP:
1297 carp_set_state(sc, MASTER);
1298 carp_send_ad_locked(sc);
1299 carp_send_arp(sc);
1300 #ifdef INET6
1301 carp_send_na(sc);
1302 #endif /* INET6 */
1303 carp_setrun(sc, 0);
1304 carp_setroute(sc, RTM_ADD);
1305 break;
1306 }
1307 }
1308
1309 /*
1310 * When in backup state, af indicates whether to reset the master down timer
1311 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1312 */
1313 static void
1314 carp_setrun(struct carp_softc *sc, sa_family_t af)
1315 {
1316 struct timeval tv;
1317
1318 if (sc->sc_carpdev == NULL) {
1319 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1320 carp_set_state(sc, INIT);
1321 return;
1322 } else
1323 CARP_SCLOCK_ASSERT(sc);
1324
1325 if (SC2IFP(sc)->if_flags & IFF_UP &&
1326 sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6))
1327 SC2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING;
1328 else {
1329 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1330 carp_setroute(sc, RTM_DELETE);
1331 return;
1332 }
1333
1334 switch (sc->sc_state) {
1335 case INIT:
1336 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) {
1337 carp_send_ad_locked(sc);
1338 carp_send_arp(sc);
1339 #ifdef INET6
1340 carp_send_na(sc);
1341 #endif /* INET6 */
1342 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n",
1343 SC2IFP(sc)->if_xname);
1344 carp_set_state(sc, MASTER);
1345 carp_setroute(sc, RTM_ADD);
1346 } else {
1347 CARP_DEBUG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname);
1348 carp_set_state(sc, BACKUP);
1349 carp_setroute(sc, RTM_DELETE);
1350 carp_setrun(sc, 0);
1351 }
1352 break;
1353 case BACKUP:
1354 callout_stop(&sc->sc_ad_tmo);
1355 tv.tv_sec = 3 * sc->sc_advbase;
1356 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1357 switch (af) {
1358 #ifdef INET
1359 case AF_INET:
1360 callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
1361 carp_master_down, sc);
1362 break;
1363 #endif /* INET */
1364 #ifdef INET6
1365 case AF_INET6:
1366 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
1367 carp_master_down, sc);
1368 break;
1369 #endif /* INET6 */
1370 default:
1371 if (sc->sc_naddrs)
1372 callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
1373 carp_master_down, sc);
1374 if (sc->sc_naddrs6)
1375 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
1376 carp_master_down, sc);
1377 break;
1378 }
1379 break;
1380 case MASTER:
1381 tv.tv_sec = sc->sc_advbase;
1382 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1383 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1384 carp_send_ad, sc);
1385 break;
1386 }
1387 }
1388
1389 static void
1390 carp_multicast_cleanup(struct carp_softc *sc)
1391 {
1392 struct ip_moptions *imo = &sc->sc_imo;
1393 u_int16_t n = imo->imo_num_memberships;
1394
1395 /* Clean up our own multicast memberships */
1396 while (n-- > 0) {
1397 if (imo->imo_membership[n] != NULL) {
1398 in_delmulti(imo->imo_membership[n]);
1399 imo->imo_membership[n] = NULL;
1400 }
1401 }
1402 KASSERT(imo->imo_mfilters == NULL,
1403 ("%s: imo_mfilters != NULL", __func__));
1404 imo->imo_num_memberships = 0;
1405 imo->imo_multicast_ifp = NULL;
1406 }
1407
1408 #ifdef INET6
1409 static void
1410 carp_multicast6_cleanup(struct carp_softc *sc)
1411 {
1412 struct ip6_moptions *im6o = &sc->sc_im6o;
1413
1414 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1415 struct in6_multi_mship *imm =
1416 LIST_FIRST(&im6o->im6o_memberships);
1417
1418 LIST_REMOVE(imm, i6mm_chain);
1419 in6_leavegroup(imm);
1420 }
1421 im6o->im6o_multicast_ifp = NULL;
1422 }
1423 #endif
1424
1425 static int
1426 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1427 {
1428 struct ifnet *ifp;
1429 struct carp_if *cif;
1430 struct in_ifaddr *ia, *ia_if;
1431 struct ip_moptions *imo = &sc->sc_imo;
1432 struct in_addr addr;
1433 u_long iaddr = htonl(sin->sin_addr.s_addr);
1434 int own, error;
1435
1436 if (sin->sin_addr.s_addr == 0) {
1437 if (!(SC2IFP(sc)->if_flags & IFF_UP))
1438 carp_set_state(sc, INIT);
1439 if (sc->sc_naddrs)
1440 SC2IFP(sc)->if_flags |= IFF_UP;
1441 carp_setrun(sc, 0);
1442 return (0);
1443 }
1444
1445 /* we have to do it by hands to check we won't match on us */
1446 ia_if = NULL; own = 0;
1447 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
1448 /* and, yeah, we need a multicast-capable iface too */
1449 if (ia->ia_ifp != SC2IFP(sc) &&
1450 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1451 (iaddr & ia->ia_subnetmask) == ia->ia_subnet) {
1452 if (!ia_if)
1453 ia_if = ia;
1454 if (sin->sin_addr.s_addr ==
1455 ia->ia_addr.sin_addr.s_addr)
1456 own++;
1457 }
1458 }
1459
1460 if (!ia_if)
1461 return (EADDRNOTAVAIL);
1462
1463 ia = ia_if;
1464 ifp = ia->ia_ifp;
1465
1466 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1467 (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp))
1468 return (EADDRNOTAVAIL);
1469
1470 if (imo->imo_num_memberships == 0) {
1471 addr.s_addr = htonl(INADDR_CARP_GROUP);
1472 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL)
1473 return (ENOBUFS);
1474 imo->imo_num_memberships++;
1475 imo->imo_multicast_ifp = ifp;
1476 imo->imo_multicast_ttl = CARP_DFLTTL;
1477 imo->imo_multicast_loop = 0;
1478 }
1479
1480 if (!ifp->if_carp) {
1481
1482 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP,
1483 M_WAITOK|M_ZERO);
1484 if (!cif) {
1485 error = ENOBUFS;
1486 goto cleanup;
1487 }
1488 if ((error = ifpromisc(ifp, 1))) {
1489 FREE(cif, M_CARP);
1490 goto cleanup;
1491 }
1492
1493 CARP_LOCK_INIT(cif);
1494 CARP_LOCK(cif);
1495 cif->vhif_ifp = ifp;
1496 TAILQ_INIT(&cif->vhif_vrs);
1497 ifp->if_carp = cif;
1498
1499 } else {
1500 struct carp_softc *vr;
1501
1502 cif = (struct carp_if *)ifp->if_carp;
1503 CARP_LOCK(cif);
1504 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1505 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1506 CARP_UNLOCK(cif);
1507 error = EINVAL;
1508 goto cleanup;
1509 }
1510 }
1511 sc->sc_ia = ia;
1512 sc->sc_carpdev = ifp;
1513
1514 { /* XXX prevent endless loop if already in queue */
1515 struct carp_softc *vr, *after = NULL;
1516 int myself = 0;
1517 cif = (struct carp_if *)ifp->if_carp;
1518
1519 /* XXX: cif should not change, right? So we still hold the lock */
1520 CARP_LOCK_ASSERT(cif);
1521
1522 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1523 if (vr == sc)
1524 myself = 1;
1525 if (vr->sc_vhid < sc->sc_vhid)
1526 after = vr;
1527 }
1528
1529 if (!myself) {
1530 /* We're trying to keep things in order */
1531 if (after == NULL) {
1532 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1533 } else {
1534 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1535 }
1536 cif->vhif_nvrs++;
1537 }
1538 }
1539
1540 sc->sc_naddrs++;
1541 SC2IFP(sc)->if_flags |= IFF_UP;
1542 if (own)
1543 sc->sc_advskew = 0;
1544 carp_sc_state_locked(sc);
1545 carp_setrun(sc, 0);
1546
1547 CARP_UNLOCK(cif);
1548
1549 return (0);
1550
1551 cleanup:
1552 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1553 return (error);
1554 }
1555
1556 static int
1557 carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1558 {
1559 int error = 0;
1560
1561 if (!--sc->sc_naddrs) {
1562 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1563 struct ip_moptions *imo = &sc->sc_imo;
1564
1565 CARP_LOCK(cif);
1566 callout_stop(&sc->sc_ad_tmo);
1567 SC2IFP(sc)->if_flags &= ~IFF_UP;
1568 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1569 sc->sc_vhid = -1;
1570 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1571 imo->imo_multicast_ifp = NULL;
1572 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1573 if (!--cif->vhif_nvrs) {
1574 sc->sc_carpdev->if_carp = NULL;
1575 CARP_LOCK_DESTROY(cif);
1576 FREE(cif, M_IFADDR);
1577 } else {
1578 CARP_UNLOCK(cif);
1579 }
1580 }
1581
1582 return (error);
1583 }
1584
1585 #ifdef INET6
1586 static int
1587 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1588 {
1589 struct ifnet *ifp;
1590 struct carp_if *cif;
1591 struct in6_ifaddr *ia, *ia_if;
1592 struct ip6_moptions *im6o = &sc->sc_im6o;
1593 struct in6_multi_mship *imm;
1594 struct in6_addr in6;
1595 int own, error;
1596
1597 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1598 if (!(SC2IFP(sc)->if_flags & IFF_UP))
1599 carp_set_state(sc, INIT);
1600 if (sc->sc_naddrs6)
1601 SC2IFP(sc)->if_flags |= IFF_UP;
1602 carp_setrun(sc, 0);
1603 return (0);
1604 }
1605
1606 /* we have to do it by hands to check we won't match on us */
1607 ia_if = NULL; own = 0;
1608 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1609 int i;
1610
1611 for (i = 0; i < 4; i++) {
1612 if ((sin6->sin6_addr.s6_addr32[i] &
1613 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
1614 (ia->ia_addr.sin6_addr.s6_addr32[i] &
1615 ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
1616 break;
1617 }
1618 /* and, yeah, we need a multicast-capable iface too */
1619 if (ia->ia_ifp != SC2IFP(sc) &&
1620 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1621 (i == 4)) {
1622 if (!ia_if)
1623 ia_if = ia;
1624 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
1625 &ia->ia_addr.sin6_addr))
1626 own++;
1627 }
1628 }
1629
1630 if (!ia_if)
1631 return (EADDRNOTAVAIL);
1632 ia = ia_if;
1633 ifp = ia->ia_ifp;
1634
1635 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1636 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp))
1637 return (EADDRNOTAVAIL);
1638
1639 if (!sc->sc_naddrs6) {
1640 im6o->im6o_multicast_ifp = ifp;
1641
1642 /* join CARP multicast address */
1643 bzero(&in6, sizeof(in6));
1644 in6.s6_addr16[0] = htons(0xff02);
1645 in6.s6_addr8[15] = 0x12;
1646 if (in6_setscope(&in6, ifp, NULL) != 0)
1647 goto cleanup;
1648 if ((imm = in6_joingroup(ifp, &in6, &error, 0)) == NULL)
1649 goto cleanup;
1650 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1651
1652 /* join solicited multicast address */
1653 bzero(&in6, sizeof(in6));
1654 in6.s6_addr16[0] = htons(0xff02);
1655 in6.s6_addr32[1] = 0;
1656 in6.s6_addr32[2] = htonl(1);
1657 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3];
1658 in6.s6_addr8[12] = 0xff;
1659 if (in6_setscope(&in6, ifp, NULL) != 0)
1660 goto cleanup;
1661 if ((imm = in6_joingroup(ifp, &in6, &error, 0)) == NULL)
1662 goto cleanup;
1663 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1664 }
1665
1666 if (!ifp->if_carp) {
1667 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP,
1668 M_WAITOK|M_ZERO);
1669 if (!cif) {
1670 error = ENOBUFS;
1671 goto cleanup;
1672 }
1673 if ((error = ifpromisc(ifp, 1))) {
1674 FREE(cif, M_CARP);
1675 goto cleanup;
1676 }
1677
1678 CARP_LOCK_INIT(cif);
1679 CARP_LOCK(cif);
1680 cif->vhif_ifp = ifp;
1681 TAILQ_INIT(&cif->vhif_vrs);
1682 ifp->if_carp = cif;
1683
1684 } else {
1685 struct carp_softc *vr;
1686
1687 cif = (struct carp_if *)ifp->if_carp;
1688 CARP_LOCK(cif);
1689 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1690 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1691 CARP_UNLOCK(cif);
1692 error = EINVAL;
1693 goto cleanup;
1694 }
1695 }
1696 sc->sc_ia6 = ia;
1697 sc->sc_carpdev = ifp;
1698
1699 { /* XXX prevent endless loop if already in queue */
1700 struct carp_softc *vr, *after = NULL;
1701 int myself = 0;
1702 cif = (struct carp_if *)ifp->if_carp;
1703 CARP_LOCK_ASSERT(cif);
1704
1705 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1706 if (vr == sc)
1707 myself = 1;
1708 if (vr->sc_vhid < sc->sc_vhid)
1709 after = vr;
1710 }
1711
1712 if (!myself) {
1713 /* We're trying to keep things in order */
1714 if (after == NULL) {
1715 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1716 } else {
1717 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1718 }
1719 cif->vhif_nvrs++;
1720 }
1721 }
1722
1723 sc->sc_naddrs6++;
1724 SC2IFP(sc)->if_flags |= IFF_UP;
1725 if (own)
1726 sc->sc_advskew = 0;
1727 carp_sc_state_locked(sc);
1728 carp_setrun(sc, 0);
1729
1730 CARP_UNLOCK(cif);
1731
1732 return (0);
1733
1734 cleanup:
1735 /* clean up multicast memberships */
1736 if (!sc->sc_naddrs6) {
1737 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1738 imm = LIST_FIRST(&im6o->im6o_memberships);
1739 LIST_REMOVE(imm, i6mm_chain);
1740 in6_leavegroup(imm);
1741 }
1742 }
1743 return (error);
1744 }
1745
1746 static int
1747 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1748 {
1749 int error = 0;
1750
1751 if (!--sc->sc_naddrs6) {
1752 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1753 struct ip6_moptions *im6o = &sc->sc_im6o;
1754
1755 CARP_LOCK(cif);
1756 callout_stop(&sc->sc_ad_tmo);
1757 SC2IFP(sc)->if_flags &= ~IFF_UP;
1758 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1759 sc->sc_vhid = -1;
1760 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1761 struct in6_multi_mship *imm =
1762 LIST_FIRST(&im6o->im6o_memberships);
1763
1764 LIST_REMOVE(imm, i6mm_chain);
1765 in6_leavegroup(imm);
1766 }
1767 im6o->im6o_multicast_ifp = NULL;
1768 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1769 if (!--cif->vhif_nvrs) {
1770 CARP_LOCK_DESTROY(cif);
1771 sc->sc_carpdev->if_carp = NULL;
1772 FREE(cif, M_IFADDR);
1773 } else
1774 CARP_UNLOCK(cif);
1775 }
1776
1777 return (error);
1778 }
1779 #endif /* INET6 */
1780
1781 static int
1782 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr)
1783 {
1784 struct carp_softc *sc = ifp->if_softc, *vr;
1785 struct carpreq carpr;
1786 struct ifaddr *ifa;
1787 struct ifreq *ifr;
1788 struct ifaliasreq *ifra;
1789 int locked = 0, error = 0;
1790
1791 ifa = (struct ifaddr *)addr;
1792 ifra = (struct ifaliasreq *)addr;
1793 ifr = (struct ifreq *)addr;
1794
1795 switch (cmd) {
1796 case SIOCSIFADDR:
1797 switch (ifa->ifa_addr->sa_family) {
1798 #ifdef INET
1799 case AF_INET:
1800 SC2IFP(sc)->if_flags |= IFF_UP;
1801 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1802 sizeof(struct sockaddr));
1803 error = carp_set_addr(sc, satosin(ifa->ifa_addr));
1804 break;
1805 #endif /* INET */
1806 #ifdef INET6
1807 case AF_INET6:
1808 SC2IFP(sc)->if_flags |= IFF_UP;
1809 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr));
1810 break;
1811 #endif /* INET6 */
1812 default:
1813 error = EAFNOSUPPORT;
1814 break;
1815 }
1816 break;
1817
1818 case SIOCAIFADDR:
1819 switch (ifa->ifa_addr->sa_family) {
1820 #ifdef INET
1821 case AF_INET:
1822 SC2IFP(sc)->if_flags |= IFF_UP;
1823 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1824 sizeof(struct sockaddr));
1825 error = carp_set_addr(sc, satosin(&ifra->ifra_addr));
1826 break;
1827 #endif /* INET */
1828 #ifdef INET6
1829 case AF_INET6:
1830 SC2IFP(sc)->if_flags |= IFF_UP;
1831 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr));
1832 break;
1833 #endif /* INET6 */
1834 default:
1835 error = EAFNOSUPPORT;
1836 break;
1837 }
1838 break;
1839
1840 case SIOCDIFADDR:
1841 switch (ifa->ifa_addr->sa_family) {
1842 #ifdef INET
1843 case AF_INET:
1844 error = carp_del_addr(sc, satosin(&ifra->ifra_addr));
1845 break;
1846 #endif /* INET */
1847 #ifdef INET6
1848 case AF_INET6:
1849 error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr));
1850 break;
1851 #endif /* INET6 */
1852 default:
1853 error = EAFNOSUPPORT;
1854 break;
1855 }
1856 break;
1857
1858 case SIOCSIFFLAGS:
1859 if (sc->sc_carpdev) {
1860 locked = 1;
1861 CARP_SCLOCK(sc);
1862 }
1863 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) {
1864 callout_stop(&sc->sc_ad_tmo);
1865 callout_stop(&sc->sc_md_tmo);
1866 callout_stop(&sc->sc_md6_tmo);
1867 if (sc->sc_state == MASTER)
1868 carp_send_ad_locked(sc);
1869 carp_set_state(sc, INIT);
1870 carp_setrun(sc, 0);
1871 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) {
1872 SC2IFP(sc)->if_flags |= IFF_UP;
1873 carp_setrun(sc, 0);
1874 }
1875 break;
1876
1877 case SIOCSVH:
1878 error = priv_check(curthread, PRIV_NETINET_CARP);
1879 if (error)
1880 break;
1881 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr)))
1882 break;
1883 error = 1;
1884 if (sc->sc_carpdev) {
1885 locked = 1;
1886 CARP_SCLOCK(sc);
1887 }
1888 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) {
1889 switch (carpr.carpr_state) {
1890 case BACKUP:
1891 callout_stop(&sc->sc_ad_tmo);
1892 carp_set_state(sc, BACKUP);
1893 carp_setrun(sc, 0);
1894 carp_setroute(sc, RTM_DELETE);
1895 break;
1896 case MASTER:
1897 carp_master_down_locked(sc);
1898 break;
1899 default:
1900 break;
1901 }
1902 }
1903 if (carpr.carpr_vhid > 0) {
1904 if (carpr.carpr_vhid > 255) {
1905 error = EINVAL;
1906 break;
1907 }
1908 if (sc->sc_carpdev) {
1909 struct carp_if *cif;
1910 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1911 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1912 if (vr != sc &&
1913 vr->sc_vhid == carpr.carpr_vhid) {
1914 error = EEXIST;
1915 break;
1916 }
1917 if (error == EEXIST)
1918 break;
1919 }
1920 sc->sc_vhid = carpr.carpr_vhid;
1921 IF_LLADDR(sc->sc_ifp)[0] = 0;
1922 IF_LLADDR(sc->sc_ifp)[1] = 0;
1923 IF_LLADDR(sc->sc_ifp)[2] = 0x5e;
1924 IF_LLADDR(sc->sc_ifp)[3] = 0;
1925 IF_LLADDR(sc->sc_ifp)[4] = 1;
1926 IF_LLADDR(sc->sc_ifp)[5] = sc->sc_vhid;
1927 error--;
1928 }
1929 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) {
1930 if (carpr.carpr_advskew >= 255) {
1931 error = EINVAL;
1932 break;
1933 }
1934 if (carpr.carpr_advbase > 255) {
1935 error = EINVAL;
1936 break;
1937 }
1938 sc->sc_advbase = carpr.carpr_advbase;
1939 sc->sc_advskew = carpr.carpr_advskew;
1940 error--;
1941 }
1942 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key));
1943 if (error > 0)
1944 error = EINVAL;
1945 else {
1946 error = 0;
1947 carp_setrun(sc, 0);
1948 }
1949 break;
1950
1951 case SIOCGVH:
1952 /* XXX: lockless read */
1953 bzero(&carpr, sizeof(carpr));
1954 carpr.carpr_state = sc->sc_state;
1955 carpr.carpr_vhid = sc->sc_vhid;
1956 carpr.carpr_advbase = sc->sc_advbase;
1957 carpr.carpr_advskew = sc->sc_advskew;
1958 error = priv_check(curthread, PRIV_NETINET_CARP);
1959 if (error == 0)
1960 bcopy(sc->sc_key, carpr.carpr_key,
1961 sizeof(carpr.carpr_key));
1962 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
1963 break;
1964
1965 default:
1966 error = EINVAL;
1967 }
1968
1969 if (locked)
1970 CARP_SCUNLOCK(sc);
1971
1972 carp_hmac_prepare(sc);
1973
1974 return (error);
1975 }
1976
1977 /*
1978 * XXX: this is looutput. We should eventually use it from there.
1979 */
1980 static int
1981 carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
1982 struct rtentry *rt)
1983 {
1984 u_int32_t af;
1985
1986 M_ASSERTPKTHDR(m); /* check if we have the packet header */
1987
1988 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
1989 m_freem(m);
1990 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
1991 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
1992 }
1993
1994 ifp->if_opackets++;
1995 ifp->if_obytes += m->m_pkthdr.len;
1996
1997 /* BPF writes need to be handled specially. */
1998 if (dst->sa_family == AF_UNSPEC) {
1999 bcopy(dst->sa_data, &af, sizeof(af));
2000 dst->sa_family = af;
2001 }
2002
2003 #if 1 /* XXX */
2004 switch (dst->sa_family) {
2005 case AF_INET:
2006 case AF_INET6:
2007 case AF_IPX:
2008 case AF_APPLETALK:
2009 break;
2010 default:
2011 printf("carp_looutput: af=%d unexpected\n", dst->sa_family);
2012 m_freem(m);
2013 return (EAFNOSUPPORT);
2014 }
2015 #endif
2016 return(if_simloop(ifp, m, dst->sa_family, 0));
2017 }
2018
2019 /*
2020 * Start output on carp interface. This function should never be called.
2021 */
2022 static void
2023 carp_start(struct ifnet *ifp)
2024 {
2025 #ifdef DEBUG
2026 printf("%s: start called\n", ifp->if_xname);
2027 #endif
2028 }
2029
2030 int
2031 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
2032 struct rtentry *rt)
2033 {
2034 struct m_tag *mtag;
2035 struct carp_softc *sc;
2036 struct ifnet *carp_ifp;
2037
2038 if (!sa)
2039 return (0);
2040
2041 switch (sa->sa_family) {
2042 #ifdef INET
2043 case AF_INET:
2044 break;
2045 #endif /* INET */
2046 #ifdef INET6
2047 case AF_INET6:
2048 break;
2049 #endif /* INET6 */
2050 default:
2051 return (0);
2052 }
2053
2054 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL);
2055 if (mtag == NULL)
2056 return (0);
2057
2058 bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *));
2059 sc = carp_ifp->if_softc;
2060
2061 /* Set the source MAC address to Virtual Router MAC Address */
2062 switch (ifp->if_type) {
2063 case IFT_ETHER:
2064 case IFT_L2VLAN: {
2065 struct ether_header *eh;
2066
2067 eh = mtod(m, struct ether_header *);
2068 eh->ether_shost[0] = 0;
2069 eh->ether_shost[1] = 0;
2070 eh->ether_shost[2] = 0x5e;
2071 eh->ether_shost[3] = 0;
2072 eh->ether_shost[4] = 1;
2073 eh->ether_shost[5] = sc->sc_vhid;
2074 }
2075 break;
2076 case IFT_FDDI: {
2077 struct fddi_header *fh;
2078
2079 fh = mtod(m, struct fddi_header *);
2080 fh->fddi_shost[0] = 0;
2081 fh->fddi_shost[1] = 0;
2082 fh->fddi_shost[2] = 0x5e;
2083 fh->fddi_shost[3] = 0;
2084 fh->fddi_shost[4] = 1;
2085 fh->fddi_shost[5] = sc->sc_vhid;
2086 }
2087 break;
2088 case IFT_ISO88025: {
2089 struct iso88025_header *th;
2090 th = mtod(m, struct iso88025_header *);
2091 th->iso88025_shost[0] = 3;
2092 th->iso88025_shost[1] = 0;
2093 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1);
2094 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1);
2095 th->iso88025_shost[4] = 0;
2096 th->iso88025_shost[5] = 0;
2097 }
2098 break;
2099 default:
2100 printf("%s: carp is not supported for this interface type\n",
2101 ifp->if_xname);
2102 return (EOPNOTSUPP);
2103 }
2104
2105 return (0);
2106 }
2107
2108 static void
2109 carp_set_state(struct carp_softc *sc, int state)
2110 {
2111
2112 if (sc->sc_carpdev)
2113 CARP_SCLOCK_ASSERT(sc);
2114
2115 if (sc->sc_state == state)
2116 return;
2117
2118 sc->sc_state = state;
2119 switch (state) {
2120 case BACKUP:
2121 SC2IFP(sc)->if_link_state = LINK_STATE_DOWN;
2122 break;
2123 case MASTER:
2124 SC2IFP(sc)->if_link_state = LINK_STATE_UP;
2125 break;
2126 default:
2127 SC2IFP(sc)->if_link_state = LINK_STATE_UNKNOWN;
2128 break;
2129 }
2130 rt_ifmsg(SC2IFP(sc));
2131 }
2132
2133 void
2134 carp_carpdev_state(void *v)
2135 {
2136 struct carp_if *cif = v;
2137
2138 CARP_LOCK(cif);
2139 carp_carpdev_state_locked(cif);
2140 CARP_UNLOCK(cif);
2141 }
2142
2143 static void
2144 carp_carpdev_state_locked(struct carp_if *cif)
2145 {
2146 struct carp_softc *sc;
2147
2148 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
2149 carp_sc_state_locked(sc);
2150 }
2151
2152 static void
2153 carp_sc_state_locked(struct carp_softc *sc)
2154 {
2155 CARP_SCLOCK_ASSERT(sc);
2156
2157 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP ||
2158 !(sc->sc_carpdev->if_flags & IFF_UP)) {
2159 sc->sc_flags_backup = SC2IFP(sc)->if_flags;
2160 SC2IFP(sc)->if_flags &= ~IFF_UP;
2161 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
2162 callout_stop(&sc->sc_ad_tmo);
2163 callout_stop(&sc->sc_md_tmo);
2164 callout_stop(&sc->sc_md6_tmo);
2165 carp_set_state(sc, INIT);
2166 carp_setrun(sc, 0);
2167 if (!sc->sc_suppress) {
2168 carp_suppress_preempt++;
2169 if (carp_suppress_preempt == 1) {
2170 CARP_SCUNLOCK(sc);
2171 carp_send_ad_all();
2172 CARP_SCLOCK(sc);
2173 }
2174 }
2175 sc->sc_suppress = 1;
2176 } else {
2177 SC2IFP(sc)->if_flags |= sc->sc_flags_backup;
2178 carp_set_state(sc, INIT);
2179 carp_setrun(sc, 0);
2180 if (sc->sc_suppress)
2181 carp_suppress_preempt--;
2182 sc->sc_suppress = 0;
2183 }
2184
2185 return;
2186 }
2187
2188 static int
2189 carp_modevent(module_t mod, int type, void *data)
2190 {
2191 switch (type) {
2192 case MOD_LOAD:
2193 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
2194 carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY);
2195 if (if_detach_event_tag == NULL)
2196 return (ENOMEM);
2197 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF);
2198 LIST_INIT(&carpif_list);
2199 if_clone_attach(&carp_cloner);
2200 break;
2201
2202 case MOD_UNLOAD:
2203 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag);
2204 if_clone_detach(&carp_cloner);
2205 mtx_destroy(&carp_mtx);
2206 break;
2207
2208 default:
2209 return (EINVAL);
2210 }
2211
2212 return (0);
2213 }
2214
2215 static moduledata_t carp_mod = {
2216 "carp",
2217 carp_modevent,
2218 0
2219 };
2220
2221 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
Cache object: 46d48d417bd397a0954c37a385dbc982
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