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HAMMER 60I/Many: Mirroring
[dragonfly.git] / sys / netinet / ip_carp.c
blob7ab954684d41333d31b467417cd81604ac0c5740
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 * $FreeBSD: src/sys/netinet/ip_carp.c,v 1.48 2007/02/02 09:39:09 glebius Exp $
28 * $DragonFly: src/sys/netinet/ip_carp.c,v 1.9 2008/06/08 08:38:05 sephe Exp $
29 */
30
31 #include "opt_carp.h"
32 /*#include "opt_bpf.h"*/
33 #include "opt_inet.h"
34 #include "opt_inet6.h"
35
36 #include <sys/types.h>
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/conf.h>
40 #include <sys/kernel.h>
41 #include <machine/limits.h>
42 #include <sys/malloc.h>
43 #include <sys/mbuf.h>
44 #include <sys/module.h>
45 #include <sys/time.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 #include <sys/in_cksum.h>
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/if.h>
61 #include <net/if_dl.h>
62 #include <net/if_types.h>
63 #include <net/route.h>
64 #include <net/if_clone.h>
65
66 #ifdef INET
67 #include <netinet/in.h>
68 #include <netinet/in_var.h>
69 #include <netinet/in_systm.h>
70 #include <netinet/ip.h>
71 #include <netinet/ip_var.h>
72 #include <netinet/if_ether.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/scope6_var.h>
80 #include <netinet6/nd6.h>
81 #endif
82
83 #include <crypto/sha1.h>
84 #include <netinet/ip_carp.h>
85 #include <sys/lock.h>
86
87 #define CARP_IFNAME "carp"
88 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces");
89 static MALLOC_DEFINE(M_IFNET, "IFNET", "IFNET CARP?");
90 SYSCTL_DECL(_net_inet_carp);
91
92 struct carp_softc {
93 struct ifnet *sc_ifp; /* Interface clue */
94 struct ifnet *sc_carpdev; /* Pointer to parent interface */
95 struct in_ifaddr *sc_ia; /* primary iface address */
96 struct ip_moptions sc_imo;
97 #ifdef INET6
98 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */
99 struct ip6_moptions sc_im6o;
100 #endif /* INET6 */
101 TAILQ_ENTRY(carp_softc) sc_list;
102
103 enum { INIT = 0, BACKUP, MASTER } sc_state;
104
105 int sc_flags_backup;
106 int sc_suppress;
107
108 int sc_sendad_errors;
109 #define CARP_SENDAD_MAX_ERRORS 3
110 int sc_sendad_success;
111 #define CARP_SENDAD_MIN_SUCCESS 3
112
113 int sc_vhid;
114 int sc_advskew;
115 int sc_naddrs;
116 int sc_naddrs6;
117 int sc_advbase; /* seconds */
118 int sc_init_counter;
119 u_int64_t sc_counter;
120
121 /* authentication */
122 #define CARP_HMAC_PAD 64
123 unsigned char sc_key[CARP_KEY_LEN];
124 unsigned char sc_pad[CARP_HMAC_PAD];
125 SHA1_CTX sc_sha1;
126
127 struct callout sc_ad_tmo; /* advertisement timeout */
128 struct callout sc_md_tmo; /* master down timeout */
129 struct callout sc_md6_tmo; /* master down timeout */
130
131 LIST_ENTRY(carp_softc) sc_next; /* Interface clue */
132 };
133 #define SC2IFP(sc) ((sc)->sc_ifp)
134
135 int carp_suppress_preempt = 0;
136 int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */
137 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW,
138 &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets");
139 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW,
140 &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode");
141 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW,
142 &carp_opts[CARPCTL_LOG], 0, "log bad carp packets");
143 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW,
144 &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses");
145 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD,
146 &carp_suppress_preempt, 0, "Preemption is suppressed");
147
148 struct carpstats carpstats;
149 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW,
150 &carpstats, carpstats,
151 "CARP statistics (struct carpstats, netinet/ip_carp.h)");
152
153 struct carp_if {
154 TAILQ_HEAD(, carp_softc) vhif_vrs;
155 int vhif_nvrs;
156
157 struct ifnet *vhif_ifp;
158 struct lock vhif_lock;
159 };
160
161 /* Get carp_if from softc. Valid after carp_set_addr{,6}. */
162 #define SC2CIF(sc) ((struct carp_if *)(sc)->sc_carpdev->if_carp)
163
164 #define CARP_LOCK_INIT(cif) lockinit(&(cif)->vhif_lock, "carp_if", 0, LK_NOWAIT);
165 #define CARP_LOCK_DESTROY(cif) ;
166 #define CARP_LOCK_ASSERT(cif) ;
167 #define CARP_LOCK(cif) lockmgr(&(cif)->vhif_lock, LK_EXCLUSIVE);
168 #define CARP_UNLOCK(cif) lockmgr(&(cif)->vhif_lock, LK_RELEASE);
169
170 #define CARP_SCLOCK(sc) lockmgr(&SC2CIF(sc)->vhif_lock, LK_EXCLUSIVE);
171 #define CARP_SCUNLOCK(sc) lockmgr(&SC2CIF(sc)->vhif_lock, LK_RELEASE);
172 #define CARP_SCLOCK_ASSERT(sc) ;
173
174 #define CARP_LOG(...) do { \
175 if (carp_opts[CARPCTL_LOG] > 0) \
176 log(LOG_INFO, __VA_ARGS__); \
177 } while (0)
178
179 #define CARP_DEBUG(...) do { \
180 if (carp_opts[CARPCTL_LOG] > 1) \
181 log(LOG_DEBUG, __VA_ARGS__); \
182 } while (0)
183
184 static void carp_hmac_prepare(struct carp_softc *);
185 static void carp_hmac_generate(struct carp_softc *, u_int32_t *,
186 unsigned char *);
187 static int carp_hmac_verify(struct carp_softc *, u_int32_t *,
188 unsigned char *);
189 static void carp_setroute(struct carp_softc *, int);
190 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t);
191 static int carp_clone_create(struct if_clone *, int);
192 static void carp_clone_destroy(struct ifnet *);
193 static void carpdetach(struct carp_softc *, int);
194 static int carp_prepare_ad(struct mbuf *, struct carp_softc *,
195 struct carp_header *);
196 static void carp_send_ad_all(void);
197 static void carp_send_ad(void *);
198 static void carp_send_ad_locked(struct carp_softc *);
199 static void carp_send_arp(struct carp_softc *);
200 static void carp_master_down(void *);
201 static void carp_master_down_locked(struct carp_softc *);
202 static int carp_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
203 static int carp_looutput(struct ifnet *, struct mbuf *, struct sockaddr *,
204 struct rtentry *);
205 static void carp_start(struct ifnet *);
206 static void carp_setrun(struct carp_softc *, sa_family_t);
207 static void carp_set_state(struct carp_softc *, int);
208 static int carp_addrcount(struct carp_if *, struct in_ifaddr *, int);
209 enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING };
210
211 static void carp_multicast_cleanup(struct carp_softc *);
212 static int carp_set_addr(struct carp_softc *, struct sockaddr_in *);
213 static int carp_del_addr(struct carp_softc *, struct sockaddr_in *);
214 static void carp_carpdev_state_locked(struct carp_if *);
215 static void carp_sc_state_locked(struct carp_softc *);
216 #ifdef INET6
217 static void carp_send_na(struct carp_softc *);
218 static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *);
219 static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *);
220 static void carp_multicast6_cleanup(struct carp_softc *);
221 #endif
222
223 static LIST_HEAD(, carp_softc) carpif_list;
224
225 struct if_clone carp_cloner = IF_CLONE_INITIALIZER(CARP_IFNAME, carp_clone_create, carp_clone_destroy, 0, IF_MAXUNIT);
226
227 static eventhandler_tag if_detach_event_tag;
228
229 static __inline u_int16_t
230 carp_cksum(struct mbuf *m, int len)
231 {
232 return (in_cksum(m, len));
233 }
234
235 static void
236 carp_hmac_prepare(struct carp_softc *sc)
237 {
238 u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
239 u_int8_t vhid = sc->sc_vhid & 0xff;
240 struct ifaddr_container *ifac;
241 int i;
242 #ifdef INET6
243 struct in6_addr in6;
244 #endif
245
246 if (sc->sc_carpdev)
247 CARP_SCLOCK(sc);
248
249 /* XXX: possible race here */
250
251 /* compute ipad from key */
252 bzero(sc->sc_pad, sizeof(sc->sc_pad));
253 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
254 for (i = 0; i < sizeof(sc->sc_pad); i++)
255 sc->sc_pad[i] ^= 0x36;
256
257 /* precompute first part of inner hash */
258 SHA1Init(&sc->sc_sha1);
259 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
260 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
261 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
262 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
263 #ifdef INET
264 TAILQ_FOREACH(ifac, &SC2IFP(sc)->if_addrheads[mycpuid], ifa_link) {
265 struct ifaddr *ifa = ifac->ifa;
266
267 if (ifa->ifa_addr->sa_family == AF_INET)
268 SHA1Update(&sc->sc_sha1,
269 (void *)&ifatoia(ifa)->ia_addr.sin_addr.s_addr,
270 sizeof(struct in_addr));
271 }
272 #endif /* INET */
273 #ifdef INET6
274 TAILQ_FOREACH(ifac, &SC2IFP(sc)->if_addrheads[mycpuid], ifa_link) {
275 struct ifaddr *ifa = ifac->ifa;
276
277 if (ifa->ifa_addr->sa_family == AF_INET6) {
278 in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
279 in6_clearscope(&in6);
280 SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6));
281 }
282 }
283 #endif /* INET6 */
284
285 /* convert ipad to opad */
286 for (i = 0; i < sizeof(sc->sc_pad); i++)
287 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
288
289 if (sc->sc_carpdev)
290 CARP_SCUNLOCK(sc);
291 }
292
293 static void
294 carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2],
295 unsigned char md[20])
296 {
297 SHA1_CTX sha1ctx;
298
299 /* fetch first half of inner hash */
300 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
301
302 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
303 SHA1Final(md, &sha1ctx);
304
305 /* outer hash */
306 SHA1Init(&sha1ctx);
307 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
308 SHA1Update(&sha1ctx, md, 20);
309 SHA1Final(md, &sha1ctx);
310 }
311
312 static int
313 carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2],
314 unsigned char md[20])
315 {
316 unsigned char md2[20];
317
318 CARP_SCLOCK_ASSERT(sc);
319
320 carp_hmac_generate(sc, counter, md2);
321
322 return (bcmp(md, md2, sizeof(md2)));
323 }
324
325 static void
326 carp_setroute(struct carp_softc *sc, int cmd)
327 {
328 struct ifaddr_container *ifac;
329
330 if (sc->sc_carpdev)
331 CARP_SCLOCK_ASSERT(sc);
332
333 crit_enter();
334 TAILQ_FOREACH(ifac, &SC2IFP(sc)->if_addrheads[mycpuid], ifa_link) {
335 struct ifaddr *ifa = ifac->ifa;
336
337 if (ifa->ifa_addr->sa_family == AF_INET &&
338 sc->sc_carpdev != NULL) {
339 int count = carp_addrcount(
340 (struct carp_if *)sc->sc_carpdev->if_carp,
341 ifatoia(ifa), CARP_COUNT_MASTER);
342
343 if ((cmd == RTM_ADD && count == 1) ||
344 (cmd == RTM_DELETE && count == 0))
345 rtinit(ifa, cmd, RTF_UP | RTF_HOST);
346 }
347 #ifdef INET6
348 if (ifa->ifa_addr->sa_family == AF_INET6) {
349 if (cmd == RTM_ADD)
350 in6_ifaddloop(ifa);
351 else
352 in6_ifremloop(ifa);
353 }
354 #endif /* INET6 */
355 }
356 crit_exit();
357
358 }
359
360 static int
361 carp_clone_create(struct if_clone *ifc, int unit)
362 {
363
364 struct carp_softc *sc;
365 struct ifnet *ifp;
366
367 MALLOC(sc, struct carp_softc *, sizeof(*sc), M_CARP, M_WAITOK|M_ZERO);
368 ifp = SC2IFP(sc) = kmalloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO);
369
370 sc->sc_flags_backup = 0;
371 sc->sc_suppress = 0;
372 sc->sc_advbase = CARP_DFLTINTV;
373 sc->sc_vhid = -1; /* required setting */
374 sc->sc_advskew = 0;
375 sc->sc_init_counter = 1;
376 sc->sc_naddrs = sc->sc_naddrs6 = 0; /* M_ZERO? */
377
378 #ifdef INET6
379 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
380 #endif
381
382 /* sc->sc_imo.imo_membership = kmalloc((sizeof(struct in_multi) * IP_MAX_MEMBERSHIPS), M_CARP,M_WAITOK);*/
383 /*
384 sc->sc_imo.imo_max_memberships = IP_MAX_MEMBERSHIPS;
385 sc->sc_imo.imo_multicast_vif = -1;
386 */
387 callout_init(&sc->sc_ad_tmo);
388 callout_init(&sc->sc_md_tmo);
389 callout_init(&sc->sc_md6_tmo);
390
391 ifp->if_softc = sc;
392 if_initname(ifp, CARP_IFNAME, unit);
393 ifp->if_mtu = ETHERMTU;
394 ifp->if_flags = IFF_LOOPBACK;
395 ifp->if_ioctl = carp_ioctl;
396 ifp->if_output = carp_looutput;
397 ifp->if_start = carp_start;
398 ifp->if_type = IFT_CARP;
399 ifp->if_snd.ifq_maxlen = ifqmaxlen;
400 ifp->if_hdrlen = 0;
401 if_attach(ifp, NULL);
402 bpfattach(ifp, DLT_NULL, sizeof(u_int));
403
404 crit_enter();
405 LIST_INSERT_HEAD(&carpif_list, sc, sc_next);
406 crit_exit();
407
408 return (0);
409 }
410
411 static void
412 carp_clone_destroy(struct ifnet *ifp)
413 {
414 struct carp_softc *sc = ifp->if_softc;
415
416 if (sc->sc_carpdev)
417 CARP_SCLOCK(sc);
418 carpdetach(sc, 1); /* Returns unlocked. */
419
420 crit_enter();
421 LIST_REMOVE(sc, sc_next);
422 crit_exit();
423 bpfdetach(ifp);
424 if_detach(ifp);
425 /* if_free_type(ifp, IFT_ETHER);*/
426 /* kfree(sc->sc_imo.imo_membership, M_CARP); */
427 kfree(sc, M_CARP);
428 }
429
430 /*
431 * This function can be called on CARP interface destroy path,
432 * and in case of the removal of the underlying interface as
433 * well. We differentiate these two cases. In the latter case
434 * we do not cleanup our multicast memberships, since they
435 * are already freed. Also, in the latter case we do not
436 * release the lock on return, because the function will be
437 * called once more, for another CARP instance on the same
438 * interface.
439 */
440 static void
441 carpdetach(struct carp_softc *sc, int unlock)
442 {
443 struct carp_if *cif;
444
445 callout_stop(&sc->sc_ad_tmo);
446 callout_stop(&sc->sc_md_tmo);
447 callout_stop(&sc->sc_md6_tmo);
448
449 if (sc->sc_suppress)
450 carp_suppress_preempt--;
451 sc->sc_suppress = 0;
452
453 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
454 carp_suppress_preempt--;
455 sc->sc_sendad_errors = 0;
456
457 carp_set_state(sc, INIT);
458 SC2IFP(sc)->if_flags &= ~IFF_UP;
459 carp_setrun(sc, 0);
460 if (unlock)
461 carp_multicast_cleanup(sc);
462 #ifdef INET6
463 carp_multicast6_cleanup(sc);
464 #endif
465
466 if (sc->sc_carpdev != NULL) {
467 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
468 CARP_LOCK_ASSERT(cif);
469 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
470 if (!--cif->vhif_nvrs) {
471 ifpromisc(sc->sc_carpdev, 0);
472 sc->sc_carpdev->if_carp = NULL;
473 CARP_LOCK_DESTROY(cif);
474 FREE(cif, M_IFADDR);
475 } else if (unlock)
476 CARP_UNLOCK(cif);
477 sc->sc_carpdev = NULL;
478 }
479 }
480
481 /* Detach an interface from the carp. */
482 static void
483 carp_ifdetach(void *arg __unused, struct ifnet *ifp)
484 {
485 struct carp_if *cif = (struct carp_if *)ifp->if_carp;
486 struct carp_softc *sc, *nextsc;
487
488 if (cif == NULL)
489 return;
490
491 /*
492 * XXX: At the end of for() cycle the lock will be destroyed.
493 */
494 CARP_LOCK(cif);
495 for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) {
496 nextsc = TAILQ_NEXT(sc, sc_list);
497 carpdetach(sc, 0);
498 }
499 CARP_UNLOCK(cif);
500 }
501
502 /*
503 * process input packet.
504 * we have rearranged checks order compared to the rfc,
505 * but it seems more efficient this way or not possible otherwise.
506 */
507 void
508 carp_input(struct mbuf *m, int hlen)
509 {
510 struct ip *ip = mtod(m, struct ip *);
511 struct carp_header *ch;
512 int iplen, len;
513
514 carpstats.carps_ipackets++;
515
516 if (!carp_opts[CARPCTL_ALLOW]) {
517 m_freem(m);
518 return;
519 }
520
521 /* check if received on a valid carp interface */
522 if (m->m_pkthdr.rcvif->if_carp == NULL) {
523 carpstats.carps_badif++;
524 CARP_LOG("carp_input: packet received on non-carp "
525 "interface: %s\n",
526 m->m_pkthdr.rcvif->if_xname);
527 m_freem(m);
528 return;
529 }
530
531 /* verify that the IP TTL is 255. */
532 if (ip->ip_ttl != CARP_DFLTTL) {
533 carpstats.carps_badttl++;
534 CARP_LOG("carp_input: received ttl %d != 255i on %s\n",
535 ip->ip_ttl,
536 m->m_pkthdr.rcvif->if_xname);
537 m_freem(m);
538 return;
539 }
540
541 iplen = ip->ip_hl << 2;
542
543 if (m->m_pkthdr.len < iplen + sizeof(*ch)) {
544 carpstats.carps_badlen++;
545 CARP_LOG("carp_input: received len %zd < "
546 "sizeof(struct carp_header)\n",
547 m->m_len - sizeof(struct ip));
548 m_freem(m);
549 return;
550 }
551
552 if (iplen + sizeof(*ch) < m->m_len) {
553 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) {
554 carpstats.carps_hdrops++;
555 CARP_LOG("carp_input: pullup failed\n");
556 return;
557 }
558 ip = mtod(m, struct ip *);
559 }
560 ch = (struct carp_header *)((char *)ip + iplen);
561
562 /*
563 * verify that the received packet length is
564 * equal to the CARP header
565 */
566 len = iplen + sizeof(*ch);
567 if (len > m->m_pkthdr.len) {
568 carpstats.carps_badlen++;
569 CARP_LOG("carp_input: packet too short %d on %s\n",
570 m->m_pkthdr.len,
571 m->m_pkthdr.rcvif->if_xname);
572 m_freem(m);
573 return;
574 }
575
576 if ((m = m_pullup(m, len)) == NULL) {
577 carpstats.carps_hdrops++;
578 return;
579 }
580 ip = mtod(m, struct ip *);
581 ch = (struct carp_header *)((char *)ip + iplen);
582
583 /* verify the CARP checksum */
584 m->m_data += iplen;
585 if (carp_cksum(m, len - iplen)) {
586 carpstats.carps_badsum++;
587 CARP_LOG("carp_input: checksum failed on %s\n",
588 m->m_pkthdr.rcvif->if_xname);
589 m_freem(m);
590 return;
591 }
592 m->m_data -= iplen;
593
594 carp_input_c(m, ch, AF_INET);
595 }
596
597 #ifdef INET6
598 int
599 carp6_input(struct mbuf **mp, int *offp, int proto)
600 {
601 struct mbuf *m = *mp;
602 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
603 struct carp_header *ch;
604 u_int len;
605
606 carpstats.carps_ipackets6++;
607
608 if (!carp_opts[CARPCTL_ALLOW]) {
609 m_freem(m);
610 return (IPPROTO_DONE);
611 }
612
613 /* check if received on a valid carp interface */
614 if (m->m_pkthdr.rcvif->if_carp == NULL) {
615 carpstats.carps_badif++;
616 CARP_LOG("carp6_input: packet received on non-carp "
617 "interface: %s\n",
618 m->m_pkthdr.rcvif->if_xname);
619 m_freem(m);
620 return (IPPROTO_DONE);
621 }
622
623 /* verify that the IP TTL is 255 */
624 if (ip6->ip6_hlim != CARP_DFLTTL) {
625 carpstats.carps_badttl++;
626 CARP_LOG("carp6_input: received ttl %d != 255 on %s\n",
627 ip6->ip6_hlim,
628 m->m_pkthdr.rcvif->if_xname);
629 m_freem(m);
630 return (IPPROTO_DONE);
631 }
632
633 /* verify that we have a complete carp packet */
634 len = m->m_len;
635 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
636 if (ch == NULL) {
637 carpstats.carps_badlen++;
638 CARP_LOG("carp6_input: packet size %u too small\n", len);
639 return (IPPROTO_DONE);
640 }
641
642
643 /* verify the CARP checksum */
644 m->m_data += *offp;
645 if (carp_cksum(m, sizeof(*ch))) {
646 carpstats.carps_badsum++;
647 CARP_LOG("carp6_input: checksum failed, on %s\n",
648 m->m_pkthdr.rcvif->if_xname);
649 m_freem(m);
650 return (IPPROTO_DONE);
651 }
652 m->m_data -= *offp;
653
654 carp_input_c(m, ch, AF_INET6);
655 return (IPPROTO_DONE);
656 }
657 #endif /* INET6 */
658
659 static void
660 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af)
661 {
662 struct ifnet *ifp = m->m_pkthdr.rcvif;
663 struct carp_softc *sc;
664 u_int64_t tmp_counter;
665 struct timeval sc_tv, ch_tv;
666
667 /* verify that the VHID is valid on the receiving interface */
668 CARP_LOCK(ifp->if_carp);
669 TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list)
670 if (sc->sc_vhid == ch->carp_vhid)
671 break;
672
673 if (!sc || !((SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING))) {
674 carpstats.carps_badvhid++;
675 CARP_UNLOCK(ifp->if_carp);
676 m_freem(m);
677 return;
678 }
679
680 getmicrotime(&SC2IFP(sc)->if_lastchange);
681 SC2IFP(sc)->if_ipackets++;
682 SC2IFP(sc)->if_ibytes += m->m_pkthdr.len;
683
684 if (SC2IFP(sc)->if_bpf) {
685 struct ip *ip = mtod(m, struct ip *);
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_mtap(SC2IFP(sc)->if_bpf, 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 = karc4random();
802 sc->sc_counter = sc->sc_counter << 32;
803 sc->sc_counter += karc4random();
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 *), MB_DONTWAIT);
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 LIST_FOREACH(sc, &carpif_list, sc_next) {
831 if (sc->sc_carpdev == NULL)
832 continue;
833 CARP_SCLOCK(sc);
834 if ((SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING) &&
835 sc->sc_state == MASTER)
836 carp_send_ad_locked(sc);
837 CARP_SCUNLOCK(sc);
838 }
839 }
840
841 static void
842 carp_send_ad(void *v)
843 {
844 struct carp_softc *sc = v;
845
846 CARP_SCLOCK(sc);
847 carp_send_ad_locked(sc);
848 CARP_SCUNLOCK(sc);
849 }
850
851 static void
852 carp_send_ad_locked(struct carp_softc *sc)
853 {
854 struct carp_header ch;
855 struct timeval tv;
856 struct carp_header *ch_ptr;
857 struct mbuf *m;
858 int len, advbase, advskew;
859
860
861 /* bow out if we've lost our UPness or RUNNINGuiness */
862 if (!((SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING))) {
863 advbase = 255;
864 advskew = 255;
865 } else {
866 advbase = sc->sc_advbase;
867 if (!carp_suppress_preempt || sc->sc_advskew > 240)
868 advskew = sc->sc_advskew;
869 else
870 advskew = 240;
871 tv.tv_sec = advbase;
872 tv.tv_usec = advskew * 1000000 / 256;
873 }
874
875 ch.carp_version = CARP_VERSION;
876 ch.carp_type = CARP_ADVERTISEMENT;
877 ch.carp_vhid = sc->sc_vhid;
878 ch.carp_advbase = advbase;
879 ch.carp_advskew = advskew;
880 ch.carp_authlen = 7; /* XXX DEFINE */
881 ch.carp_pad1 = 0; /* must be zero */
882 ch.carp_cksum = 0;
883
884 #ifdef INET
885 if (sc->sc_ia) {
886 struct ip *ip;
887
888 MGETHDR(m, M_NOWAIT, MT_HEADER);
889 if (m == NULL) {
890 SC2IFP(sc)->if_oerrors++;
891 carpstats.carps_onomem++;
892 /* XXX maybe less ? */
893 if (advbase != 255 || advskew != 255)
894 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
895 carp_send_ad, sc);
896 return;
897 }
898 len = sizeof(*ip) + sizeof(ch);
899 m->m_pkthdr.len = len;
900 m->m_pkthdr.rcvif = NULL;
901 m->m_len = len;
902 MH_ALIGN(m, m->m_len);
903 m->m_flags |= M_MCAST;
904 ip = mtod(m, struct ip *);
905 ip->ip_v = IPVERSION;
906 ip->ip_hl = sizeof(*ip) >> 2;
907 ip->ip_tos = IPTOS_LOWDELAY;
908 ip->ip_len = len;
909 ip->ip_id = ip_newid();
910 ip->ip_off = IP_DF;
911 ip->ip_ttl = CARP_DFLTTL;
912 ip->ip_p = IPPROTO_CARP;
913 ip->ip_sum = 0;
914 ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr;
915 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
916
917 ch_ptr = (struct carp_header *)(&ip[1]);
918 bcopy(&ch, ch_ptr, sizeof(ch));
919 if (carp_prepare_ad(m, sc, ch_ptr))
920 return;
921
922 m->m_data += sizeof(*ip);
923 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip));
924 m->m_data -= sizeof(*ip);
925
926 getmicrotime(&SC2IFP(sc)->if_lastchange);
927 SC2IFP(sc)->if_opackets++;
928 SC2IFP(sc)->if_obytes += len;
929 carpstats.carps_opackets++;
930
931 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) {
932 SC2IFP(sc)->if_oerrors++;
933 if (sc->sc_sendad_errors < INT_MAX)
934 sc->sc_sendad_errors++;
935 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
936 carp_suppress_preempt++;
937 if (carp_suppress_preempt == 1) {
938 CARP_SCUNLOCK(sc);
939 carp_send_ad_all();
940 CARP_SCLOCK(sc);
941 }
942 }
943 sc->sc_sendad_success = 0;
944 } else {
945 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
946 if (++sc->sc_sendad_success >=
947 CARP_SENDAD_MIN_SUCCESS) {
948 carp_suppress_preempt--;
949 sc->sc_sendad_errors = 0;
950 }
951 } else
952 sc->sc_sendad_errors = 0;
953 }
954 }
955 #endif /* INET */
956 #ifdef INET6
957 if (sc->sc_ia6) {
958 struct ip6_hdr *ip6;
959
960 MGETHDR(m, M_NOWAIT, MT_HEADER);
961 if (m == NULL) {
962 SC2IFP(sc)->if_oerrors++;
963 carpstats.carps_onomem++;
964 /* XXX maybe less ? */
965 if (advbase != 255 || advskew != 255)
966 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
967 carp_send_ad, sc);
968 return;
969 }
970 len = sizeof(*ip6) + sizeof(ch);
971 m->m_pkthdr.len = len;
972 m->m_pkthdr.rcvif = NULL;
973 m->m_len = len;
974 MH_ALIGN(m, m->m_len);
975 m->m_flags |= M_MCAST;
976 ip6 = mtod(m, struct ip6_hdr *);
977 bzero(ip6, sizeof(*ip6));
978 ip6->ip6_vfc |= IPV6_VERSION;
979 ip6->ip6_hlim = CARP_DFLTTL;
980 ip6->ip6_nxt = IPPROTO_CARP;
981 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src,
982 sizeof(struct in6_addr));
983 /* set the multicast destination */
984
985 ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
986 ip6->ip6_dst.s6_addr8[15] = 0x12;
987 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
988 SC2IFP(sc)->if_oerrors++;
989 m_freem(m);
990 CARP_LOG("%s: in6_setscope failed\n", __func__);
991 return;
992 }
993
994 ch_ptr = (struct carp_header *)(&ip6[1]);
995 bcopy(&ch, ch_ptr, sizeof(ch));
996 if (carp_prepare_ad(m, sc, ch_ptr))
997 return;
998
999 m->m_data += sizeof(*ip6);
1000 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6));
1001 m->m_data -= sizeof(*ip6);
1002
1003 getmicrotime(&SC2IFP(sc)->if_lastchange);
1004 SC2IFP(sc)->if_opackets++;
1005 SC2IFP(sc)->if_obytes += len;
1006 carpstats.carps_opackets6++;
1007
1008 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) {
1009 SC2IFP(sc)->if_oerrors++;
1010 if (sc->sc_sendad_errors < INT_MAX)
1011 sc->sc_sendad_errors++;
1012 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1013 carp_suppress_preempt++;
1014 if (carp_suppress_preempt == 1) {
1015 CARP_SCUNLOCK(sc);
1016 carp_send_ad_all();
1017 CARP_SCLOCK(sc);
1018 }
1019 }
1020 sc->sc_sendad_success = 0;
1021 } else {
1022 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1023 if (++sc->sc_sendad_success >=
1024 CARP_SENDAD_MIN_SUCCESS) {
1025 carp_suppress_preempt--;
1026 sc->sc_sendad_errors = 0;
1027 }
1028 } else
1029 sc->sc_sendad_errors = 0;
1030 }
1031 }
1032 #endif /* INET6 */
1033
1034 if (advbase != 255 || advskew != 255)
1035 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1036 carp_send_ad, sc);
1037
1038 }
1039
1040 /*
1041 * Broadcast a gratuitous ARP request containing
1042 * the virtual router MAC address for each IP address
1043 * associated with the virtual router.
1044 */
1045 static void
1046 carp_send_arp(struct carp_softc *sc)
1047 {
1048 struct ifaddr_container *ifac;
1049
1050 TAILQ_FOREACH(ifac, &SC2IFP(sc)->if_addrheads[mycpuid], ifa_link) {
1051 struct ifaddr *ifa = ifac->ifa;
1052
1053 if (ifa->ifa_addr->sa_family != AF_INET)
1054 continue;
1055 arp_ifinit2(sc->sc_carpdev, ifa, IF_LLADDR(sc->sc_ifp));
1056
1057 DELAY(1000); /* XXX */
1058 }
1059 }
1060
1061 #ifdef INET6
1062 static void
1063 carp_send_na(struct carp_softc *sc)
1064 {
1065 struct ifaddr_container *ifac;
1066 struct in6_addr *in6;
1067 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1068
1069 TAILQ_FOREACH(ifac, &SC2IFP(sc)->if_addrheads[mycpuid], ifa_link) {
1070 struct ifaddr *ifa = ifac->ifa;
1071
1072 if (ifa->ifa_addr->sa_family != AF_INET6)
1073 continue;
1074
1075 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
1076 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1077 ND_NA_FLAG_OVERRIDE, 1, NULL);
1078 DELAY(1000); /* XXX */
1079 }
1080 }
1081 #endif /* INET6 */
1082
1083 static int
1084 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type)
1085 {
1086 struct carp_softc *vh;
1087 int count = 0;
1088
1089 CARP_LOCK_ASSERT(cif);
1090
1091 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1092 if ((type == CARP_COUNT_RUNNING &&
1093 (SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING)) ||
1094 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) {
1095 struct ifaddr_container *ifac;
1096
1097 TAILQ_FOREACH(ifac, &SC2IFP(vh)->if_addrheads[mycpuid],
1098 ifa_link) {
1099 struct ifaddr *ifa = ifac->ifa;
1100
1101 if (ifa->ifa_addr->sa_family == AF_INET &&
1102 ia->ia_addr.sin_addr.s_addr ==
1103 ifatoia(ifa)->ia_addr.sin_addr.s_addr)
1104 count++;
1105 }
1106 }
1107 }
1108 return (count);
1109 }
1110
1111 int
1112 carp_iamatch(void *v, struct in_ifaddr *ia,
1113 struct in_addr *isaddr, u_int8_t **enaddr)
1114 {
1115 struct carp_if *cif = v;
1116 struct carp_softc *vh;
1117 int index, count = 0;
1118
1119 CARP_LOCK(cif);
1120
1121 if (carp_opts[CARPCTL_ARPBALANCE]) {
1122 /*
1123 * XXX proof of concept implementation.
1124 * We use the source ip to decide which virtual host should
1125 * handle the request. If we're master of that virtual host,
1126 * then we respond, otherwise, just drop the arp packet on
1127 * the floor.
1128 */
1129 count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING);
1130 if (count == 0) {
1131 /* should never reach this */
1132 CARP_UNLOCK(cif);
1133 return (0);
1134 }
1135
1136 /* this should be a hash, like pf_hash() */
1137 index = ntohl(isaddr->s_addr) % count;
1138 count = 0;
1139
1140 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1141 if ((SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING)) {
1142 struct ifaddr_container *ifac;
1143
1144 TAILQ_FOREACH(ifac, &SC2IFP(vh)->if_addrheads[mycpuid], ifa_link) {
1145 struct ifaddr *ifa = ifac->ifa;
1146
1147 if (ifa->ifa_addr->sa_family ==
1148 AF_INET &&
1149 ia->ia_addr.sin_addr.s_addr ==
1150 ifatoia(ifa)->ia_addr.sin_addr.s_addr) {
1151 if (count == index) {
1152 if (vh->sc_state ==
1153 MASTER) {
1154 *enaddr = IF_LLADDR(vh->sc_ifp);
1155 CARP_UNLOCK(cif);
1156 return (1);
1157 } else {
1158 CARP_UNLOCK(cif);
1159 return (0);
1160 }
1161 }
1162 count++;
1163 }
1164 }
1165 }
1166 }
1167 } else {
1168 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1169 if ((SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING) &&
1170 vh->sc_state == MASTER) {
1171 *enaddr = IF_LLADDR(vh->sc_ifp);
1172 CARP_UNLOCK(cif);
1173 return (1);
1174 }
1175 }
1176 }
1177 CARP_UNLOCK(cif);
1178 return(0);
1179 }
1180
1181 #ifdef INET6
1182 struct ifaddr *
1183 carp_iamatch6(void *v, struct in6_addr *taddr)
1184 {
1185 struct carp_if *cif = v;
1186 struct carp_softc *vh;
1187
1188 CARP_LOCK(cif);
1189 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1190 struct ifaddr_container *ifac;
1191
1192 TAILQ_FOREACH(ifac, &SC2IFP(vh)->if_addrheads[mycpuid], ifa_link) {
1193 struct ifaddr *ifa = ifac->ifa;
1194
1195 if (IN6_ARE_ADDR_EQUAL(taddr,
1196 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1197 (SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING) &&
1198 vh->sc_state == MASTER) {
1199 CARP_UNLOCK(cif);
1200 return (ifa);
1201 }
1202 }
1203 }
1204 CARP_UNLOCK(cif);
1205
1206 return (NULL);
1207 }
1208
1209 void *
1210 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr)
1211 {
1212 struct m_tag *mtag;
1213 struct carp_if *cif = v;
1214 struct carp_softc *sc;
1215
1216 CARP_LOCK(cif);
1217 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
1218 struct ifaddr_container *ifac;
1219
1220 TAILQ_FOREACH(ifac, &SC2IFP(sc)->if_addrheads[mycpuid], ifa_link) {
1221 struct ifaddr *ifa = ifac->ifa;
1222
1223 if (IN6_ARE_ADDR_EQUAL(taddr,
1224 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1225 (SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING)) {
1226 struct ifnet *ifp = SC2IFP(sc);
1227 mtag = m_tag_get(PACKET_TAG_CARP,
1228 sizeof(struct ifnet *), MB_DONTWAIT);
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 /**
1257 * XXX: See here for check on MAC adr is not for virtual use
1258 *
1259 **/
1260
1261 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
1262 {
1263 return (NULL);
1264 }
1265
1266 CARP_LOCK(cif);
1267 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list)
1268 if ((SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING) &&
1269 vh->sc_state == MASTER &&
1270 !bcmp(dhost, IF_LLADDR(vh->sc_ifp), ETHER_ADDR_LEN)) {
1271 CARP_UNLOCK(cif);
1272 return (SC2IFP(vh));
1273 }
1274
1275 CARP_UNLOCK(cif);
1276 return (NULL);
1277 }
1278
1279 static void
1280 carp_master_down(void *v)
1281 {
1282 struct carp_softc *sc = v;
1283
1284 lwkt_serialize_enter(sc->sc_ifp->if_serializer);
1285 carp_master_down_locked(sc);
1286 lwkt_serialize_exit(sc->sc_ifp->if_serializer);
1287 }
1288
1289 static void
1290 carp_master_down_locked(struct carp_softc *sc)
1291 {
1292 if (sc->sc_carpdev)
1293 CARP_SCLOCK_ASSERT(sc);
1294
1295 switch (sc->sc_state) {
1296 case INIT:
1297 kprintf("%s: master_down event in INIT state\n",
1298 SC2IFP(sc)->if_xname);
1299 break;
1300 case MASTER:
1301 break;
1302 case BACKUP:
1303 carp_set_state(sc, MASTER);
1304 carp_send_ad_locked(sc);
1305 carp_send_arp(sc);
1306 #ifdef INET6
1307 carp_send_na(sc);
1308 #endif /* INET6 */
1309 carp_setrun(sc, 0);
1310 carp_setroute(sc, RTM_ADD);
1311 break;
1312 }
1313 }
1314
1315 /*
1316 * When in backup state, af indicates whether to reset the master down timer
1317 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1318 */
1319 static void
1320 carp_setrun(struct carp_softc *sc, sa_family_t af)
1321 {
1322 struct timeval tv;
1323
1324 if (sc->sc_carpdev == NULL) {
1325 SC2IFP(sc)->if_flags &= ~IFF_RUNNING;
1326 carp_set_state(sc, INIT);
1327 return;
1328 }
1329
1330 if (SC2IFP(sc)->if_flags & IFF_UP &&
1331 sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6))
1332 SC2IFP(sc)->if_flags |= IFF_RUNNING;
1333 else {
1334 SC2IFP(sc)->if_flags &= ~IFF_RUNNING;
1335 carp_setroute(sc, RTM_DELETE);
1336 return;
1337 }
1338
1339 switch (sc->sc_state) {
1340 case INIT:
1341 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) {
1342 carp_send_ad_locked(sc);
1343 carp_send_arp(sc);
1344 #ifdef INET6
1345 carp_send_na(sc);
1346 #endif /* INET6 */
1347 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n",
1348 SC2IFP(sc)->if_xname);
1349 carp_set_state(sc, MASTER);
1350 carp_setroute(sc, RTM_ADD);
1351 } else {
1352 CARP_DEBUG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname);
1353 carp_set_state(sc, BACKUP);
1354 carp_setroute(sc, RTM_DELETE);
1355 carp_setrun(sc, 0);
1356 }
1357 break;
1358 case BACKUP:
1359 callout_stop(&sc->sc_ad_tmo);
1360 tv.tv_sec = 3 * sc->sc_advbase;
1361 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1362 switch (af) {
1363 #ifdef INET
1364 case AF_INET:
1365 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
1366 carp_master_down, sc);
1367 break;
1368 #endif /* INET */
1369 #ifdef INET6
1370 case AF_INET6:
1371 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
1372 carp_master_down, sc);
1373 break;
1374 #endif /* INET6 */
1375 default:
1376 if (sc->sc_naddrs)
1377 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
1378 carp_master_down, sc);
1379 if (sc->sc_naddrs6)
1380 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
1381 carp_master_down, sc);
1382 break;
1383 }
1384 break;
1385 case MASTER:
1386 tv.tv_sec = sc->sc_advbase;
1387 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1388 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1389 carp_send_ad, sc);
1390 break;
1391 }
1392 }
1393
1394 static void
1395 carp_multicast_cleanup(struct carp_softc *sc)
1396 {
1397 struct ip_moptions *imo = &sc->sc_imo;
1398 u_int16_t n = imo->imo_num_memberships;
1399
1400 /* Clean up our own multicast memberships */
1401 while (n-- > 0) {
1402 if (imo->imo_membership[n] != NULL) {
1403 in_delmulti(imo->imo_membership[n]);
1404 imo->imo_membership[n] = NULL;
1405 }
1406 }
1407 imo->imo_num_memberships = 0;
1408 imo->imo_multicast_ifp = NULL;
1409 }
1410
1411 #ifdef INET6
1412 static void
1413 carp_multicast6_cleanup(struct carp_softc *sc)
1414 {
1415 struct ip6_moptions *im6o = &sc->sc_im6o;
1416
1417 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1418 struct in6_multi_mship *imm =
1419 LIST_FIRST(&im6o->im6o_memberships);
1420
1421 LIST_REMOVE(imm, i6mm_chain);
1422 in6_leavegroup(imm);
1423 }
1424 im6o->im6o_multicast_ifp = NULL;
1425 }
1426 #endif
1427
1428 static int
1429 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1430 {
1431 struct ifnet *ifp;
1432 struct carp_if *cif;
1433 struct in_ifaddr *ia, *ia_if;
1434 struct in_ifaddr_container *iac;
1435 struct ip_moptions *imo = &sc->sc_imo;
1436 struct in_addr addr;
1437 u_long iaddr = htonl(sin->sin_addr.s_addr);
1438 int own, error;
1439
1440 if (sin->sin_addr.s_addr == 0)
1441 {
1442 if (!(SC2IFP(sc)->if_flags & IFF_UP))
1443 {
1444 carp_set_state(sc, INIT);
1445 }
1446 if (sc->sc_naddrs)
1447 {
1448 SC2IFP(sc)->if_flags |= IFF_UP;
1449 }
1450 carp_setrun(sc, 0);
1451 return (0);
1452 }
1453 /* we have to do it by hands to check we won't match on us */
1454 ia_if = NULL; own = 0;
1455 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1456 ia = iac->ia;
1457
1458 /* and, yeah, we need a multicast-capable iface too */
1459 if (ia->ia_ifp != SC2IFP(sc) &&
1460 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1461 (iaddr & ia->ia_subnetmask) == ia->ia_subnet) {
1462 if (!ia_if)
1463 ia_if = ia;
1464 if (sin->sin_addr.s_addr ==
1465 ia->ia_addr.sin_addr.s_addr)
1466 own++;
1467 }
1468 }
1469
1470
1471 if (!ia_if)
1472 return (EADDRNOTAVAIL);
1473
1474 ia = ia_if;
1475 ifp = ia->ia_ifp;
1476
1477 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1478 (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp))
1479 return (EADDRNOTAVAIL);
1480
1481 if (imo->imo_num_memberships == 0) {
1482 addr.s_addr = htonl(INADDR_CARP_GROUP);
1483 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL)
1484 return (ENOBUFS);
1485 imo->imo_num_memberships++;
1486 imo->imo_multicast_ifp = ifp;
1487 imo->imo_multicast_ttl = CARP_DFLTTL;
1488 imo->imo_multicast_loop = 0;
1489 }
1490
1491 if (!ifp->if_carp) {
1492
1493 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP,
1494 M_WAITOK|M_ZERO);
1495 if ((error = ifpromisc(ifp, 1))) {
1496 FREE(cif, M_CARP);
1497 goto cleanup;
1498 }
1499
1500 CARP_LOCK_INIT(cif);
1501 CARP_LOCK(cif);
1502 cif->vhif_ifp = ifp;
1503 TAILQ_INIT(&cif->vhif_vrs);
1504 ifp->if_carp = cif;
1505
1506 } else {
1507 struct carp_softc *vr;
1508
1509 cif = (struct carp_if *)ifp->if_carp;
1510 CARP_LOCK(cif);
1511 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1512 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1513 CARP_UNLOCK(cif);
1514 error = EINVAL;
1515 goto cleanup;
1516 }
1517 }
1518 sc->sc_ia = ia;
1519 sc->sc_carpdev = ifp;
1520
1521 { /* XXX prevent endless loop if already in queue */
1522 struct carp_softc *vr, *after = NULL;
1523 int myself = 0;
1524 cif = (struct carp_if *)ifp->if_carp;
1525
1526 /* XXX: cif should not change, right? So we still hold the lock */
1527 CARP_LOCK_ASSERT(cif);
1528
1529 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1530 if (vr == sc)
1531 myself = 1;
1532 if (vr->sc_vhid < sc->sc_vhid)
1533 after = vr;
1534 }
1535
1536 if (!myself) {
1537 /* We're trying to keep things in order */
1538 if (after == NULL) {
1539 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1540 } else {
1541 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1542 }
1543 cif->vhif_nvrs++;
1544 }
1545 }
1546
1547 sc->sc_naddrs++;
1548 SC2IFP(sc)->if_flags |= IFF_UP;
1549 if (own)
1550 sc->sc_advskew = 0;
1551
1552
1553 carp_sc_state_locked(sc);
1554 carp_setrun(sc, 0);
1555
1556 CARP_UNLOCK(cif);
1557
1558 return (0);
1559
1560 cleanup:
1561 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1562 return (error);
1563
1564 }
1565
1566 static int
1567 carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1568 {
1569 int error = 0;
1570
1571 if (!--sc->sc_naddrs) {
1572 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1573 struct ip_moptions *imo = &sc->sc_imo;
1574
1575 CARP_LOCK(cif);
1576 callout_stop(&sc->sc_ad_tmo);
1577 SC2IFP(sc)->if_flags &= ~IFF_UP;
1578 SC2IFP(sc)->if_flags &= ~IFF_RUNNING;
1579 sc->sc_vhid = -1;
1580 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1581 imo->imo_multicast_ifp = NULL;
1582 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1583 if (!--cif->vhif_nvrs) {
1584 sc->sc_carpdev->if_carp = NULL;
1585 CARP_LOCK_DESTROY(cif);
1586 FREE(cif, M_IFADDR);
1587 } else {
1588 CARP_UNLOCK(cif);
1589 }
1590 }
1591
1592 return (error);
1593 }
1594
1595 #ifdef INET6
1596 static int
1597 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1598 {
1599 struct ifnet *ifp;
1600 struct carp_if *cif;
1601 struct in6_ifaddr *ia, *ia_if;
1602 struct ip6_moptions *im6o = &sc->sc_im6o;
1603 struct in6_multi_mship *imm;
1604 struct in6_addr in6;
1605 int own, error;
1606
1607 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1608 if (!(SC2IFP(sc)->if_flags & IFF_UP))
1609 carp_set_state(sc, INIT);
1610 if (sc->sc_naddrs6)
1611 SC2IFP(sc)->if_flags |= IFF_UP;
1612 carp_setrun(sc, 0);
1613 return (0);
1614 }
1615
1616 /* we have to do it by hands to check we won't match on us */
1617 ia_if = NULL; own = 0;
1618 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1619 int i;
1620
1621 for (i = 0; i < 4; i++) {
1622 if ((sin6->sin6_addr.s6_addr32[i] &
1623 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
1624 (ia->ia_addr.sin6_addr.s6_addr32[i] &
1625 ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
1626 break;
1627 }
1628 /* and, yeah, we need a multicast-capable iface too */
1629 if (ia->ia_ifp != SC2IFP(sc) &&
1630 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1631 (i == 4)) {
1632 if (!ia_if)
1633 ia_if = ia;
1634 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
1635 &ia->ia_addr.sin6_addr))
1636 own++;
1637 }
1638 }
1639
1640 if (!ia_if)
1641 return (EADDRNOTAVAIL);
1642 ia = ia_if;
1643 ifp = ia->ia_ifp;
1644
1645 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1646 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp))
1647 return (EADDRNOTAVAIL);
1648
1649 if (!sc->sc_naddrs6) {
1650 im6o->im6o_multicast_ifp = ifp;
1651
1652 /* join CARP multicast address */
1653 bzero(&in6, sizeof(in6));
1654 in6.s6_addr16[0] = htons(0xff02);
1655 in6.s6_addr8[15] = 0x12;
1656 if (in6_setscope(&in6, ifp, NULL) != 0)
1657 goto cleanup;
1658 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
1659 goto cleanup;
1660 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1661
1662 /* join solicited multicast address */
1663 bzero(&in6, sizeof(in6));
1664 in6.s6_addr16[0] = htons(0xff02);
1665 in6.s6_addr32[1] = 0;
1666 in6.s6_addr32[2] = htonl(1);
1667 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3];
1668 in6.s6_addr8[12] = 0xff;
1669 if (in6_setscope(&in6, ifp, NULL) != 0)
1670 goto cleanup;
1671 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
1672 goto cleanup;
1673 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1674 }
1675
1676 if (!ifp->if_carp) {
1677 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP,
1678 M_WAITOK|M_ZERO);
1679 if ((error = ifpromisc(ifp, 1))) {
1680 FREE(cif, M_CARP);
1681 goto cleanup;
1682 }
1683
1684 CARP_LOCK_INIT(cif);
1685 CARP_LOCK(cif);
1686 cif->vhif_ifp = ifp;
1687 TAILQ_INIT(&cif->vhif_vrs);
1688 ifp->if_carp = cif;
1689
1690 } else {
1691 struct carp_softc *vr;
1692
1693 cif = (struct carp_if *)ifp->if_carp;
1694 CARP_LOCK(cif);
1695 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1696 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1697 CARP_UNLOCK(cif);
1698 error = EINVAL;
1699 goto cleanup;
1700 }
1701 }
1702 sc->sc_ia6 = ia;
1703 sc->sc_carpdev = ifp;
1704
1705 { /* XXX prevent endless loop if already in queue */
1706 struct carp_softc *vr, *after = NULL;
1707 int myself = 0;
1708 cif = (struct carp_if *)ifp->if_carp;
1709 CARP_LOCK_ASSERT(cif);
1710
1711 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1712 if (vr == sc)
1713 myself = 1;
1714 if (vr->sc_vhid < sc->sc_vhid)
1715 after = vr;
1716 }
1717
1718 if (!myself) {
1719 /* We're trying to keep things in order */
1720 if (after == NULL) {
1721 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1722 } else {
1723 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1724 }
1725 cif->vhif_nvrs++;
1726 }
1727 }
1728
1729 sc->sc_naddrs6++;
1730 SC2IFP(sc)->if_flags |= IFF_UP;
1731 if (own)
1732 sc->sc_advskew = 0;
1733 carp_sc_state_locked(sc);
1734 carp_setrun(sc, 0);
1735
1736 CARP_UNLOCK(cif);
1737
1738 return (0);
1739
1740 cleanup:
1741 /* clean up multicast memberships */
1742 if (!sc->sc_naddrs6) {
1743 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1744 imm = LIST_FIRST(&im6o->im6o_memberships);
1745 LIST_REMOVE(imm, i6mm_chain);
1746 in6_leavegroup(imm);
1747 }
1748 }
1749 return (error);
1750 }
1751
1752 static int
1753 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1754 {
1755 int error = 0;
1756
1757 if (!--sc->sc_naddrs6) {
1758 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1759 struct ip6_moptions *im6o = &sc->sc_im6o;
1760
1761 CARP_LOCK(cif);
1762 callout_stop(&sc->sc_ad_tmo);
1763 SC2IFP(sc)->if_flags &= ~IFF_UP;
1764 SC2IFP(sc)->if_flags &= ~IFF_RUNNING;
1765 sc->sc_vhid = -1;
1766 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1767 struct in6_multi_mship *imm =
1768 LIST_FIRST(&im6o->im6o_memberships);
1769
1770 LIST_REMOVE(imm, i6mm_chain);
1771 in6_leavegroup(imm);
1772 }
1773 im6o->im6o_multicast_ifp = NULL;
1774 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1775 if (!--cif->vhif_nvrs) {
1776 CARP_LOCK_DESTROY(cif);
1777 sc->sc_carpdev->if_carp = NULL;
1778 FREE(cif, M_IFADDR);
1779 } else
1780 CARP_UNLOCK(cif);
1781 }
1782
1783 return (error);
1784 }
1785 #endif /* INET6 */
1786
1787 static int
1788 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr, struct ucred *creds)
1789 {
1790 struct carp_softc *sc = ifp->if_softc, *vr;
1791 struct carpreq carpr;
1792 struct ifaddr *ifa;
1793 struct ifreq *ifr;
1794 struct ifaliasreq *ifra;
1795 int locked = 0, error = 0;
1796
1797 ifa = (struct ifaddr *)addr;
1798 ifra = (struct ifaliasreq *)addr;
1799 ifr = (struct ifreq *)addr;
1800
1801
1802 switch (cmd) {
1803 case SIOCSIFADDR:
1804 switch (ifa->ifa_addr->sa_family) {
1805 #ifdef INET
1806 case AF_INET:
1807 SC2IFP(sc)->if_flags |= IFF_UP;
1808 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1809 sizeof(struct sockaddr));
1810 error = carp_set_addr(sc, satosin(ifa->ifa_addr));
1811 break;
1812 #endif /* INET */
1813 #ifdef INET6
1814 case AF_INET6:
1815 SC2IFP(sc)->if_flags |= IFF_UP;
1816 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr));
1817 break;
1818 #endif /* INET6 */
1819 default:
1820 error = EAFNOSUPPORT;
1821 break;
1822 }
1823 break;
1824
1825 case SIOCAIFADDR:
1826 switch (ifa->ifa_addr->sa_family) {
1827 #ifdef INET
1828 case AF_INET:
1829 SC2IFP(sc)->if_flags |= IFF_UP;
1830 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1831 sizeof(struct sockaddr));
1832 error = carp_set_addr(sc, satosin(&ifra->ifra_addr));
1833 break;
1834 #endif /* INET */
1835 #ifdef INET6
1836 case AF_INET6:
1837 SC2IFP(sc)->if_flags |= IFF_UP;
1838 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr));
1839 break;
1840 #endif /* INET6 */
1841 default:
1842 error = EAFNOSUPPORT;
1843 break;
1844 }
1845 break;
1846
1847 case SIOCDIFADDR:
1848 switch (ifa->ifa_addr->sa_family) {
1849 #ifdef INET
1850 case AF_INET:
1851 error = carp_del_addr(sc, satosin(&ifra->ifra_addr));
1852 break;
1853 #endif /* INET */
1854 #ifdef INET6
1855 case AF_INET6:
1856 error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr));
1857 break;
1858 #endif /* INET6 */
1859 default:
1860 error = EAFNOSUPPORT;
1861 break;
1862 }
1863 break;
1864
1865 case SIOCSIFFLAGS:
1866 if (sc->sc_carpdev) {
1867 locked = 1;
1868 CARP_SCLOCK(sc);
1869 }
1870 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) {
1871 callout_stop(&sc->sc_ad_tmo);
1872 callout_stop(&sc->sc_md_tmo);
1873 callout_stop(&sc->sc_md6_tmo);
1874 if (sc->sc_state == MASTER)
1875 carp_send_ad_locked(sc);
1876 carp_set_state(sc, INIT);
1877 carp_setrun(sc, 0);
1878 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) {
1879 SC2IFP(sc)->if_flags |= IFF_UP;
1880 carp_setrun(sc, 0);
1881 }
1882 break;
1883
1884 case SIOCSVH:
1885 error = suser(curthread);
1886 if (error)
1887 break;
1888 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr)))
1889 break;
1890 error = 1;
1891 if (sc->sc_carpdev) {
1892 locked = 1;
1893 CARP_SCLOCK(sc);
1894 }
1895 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) {
1896 switch (carpr.carpr_state) {
1897 case BACKUP:
1898 callout_stop(&sc->sc_ad_tmo);
1899 carp_set_state(sc, BACKUP);
1900 carp_setrun(sc, 0);
1901 carp_setroute(sc, RTM_DELETE);
1902 break;
1903 case MASTER:
1904 carp_master_down_locked(sc);
1905 break;
1906 default:
1907 break;
1908 }
1909 }
1910 if (carpr.carpr_vhid > 0) {
1911 if (carpr.carpr_vhid > 255) {
1912 error = EINVAL;
1913 break;
1914 }
1915 if (sc->sc_carpdev) {
1916 struct carp_if *cif;
1917 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1918 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1919 if (vr != sc &&
1920 vr->sc_vhid == carpr.carpr_vhid)
1921 return EEXIST;
1922 }
1923 sc->sc_vhid = carpr.carpr_vhid;
1924 IF_LLADDR(sc->sc_ifp)[0] = 0;
1925 IF_LLADDR(sc->sc_ifp)[1] = 0;
1926 IF_LLADDR(sc->sc_ifp)[2] = 0x5e;
1927 IF_LLADDR(sc->sc_ifp)[3] = 0;
1928 IF_LLADDR(sc->sc_ifp)[4] = 1;
1929 IF_LLADDR(sc->sc_ifp)[5] = sc->sc_vhid;
1930 error--;
1931 }
1932 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) {
1933 if (carpr.carpr_advskew >= 255) {
1934 error = EINVAL;
1935 break;
1936 }
1937 if (carpr.carpr_advbase > 255) {
1938 error = EINVAL;
1939 break;
1940 }
1941 sc->sc_advbase = carpr.carpr_advbase;
1942 sc->sc_advskew = carpr.carpr_advskew;
1943 error--;
1944 }
1945 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key));
1946 if (error > 0)
1947 error = EINVAL;
1948 else {
1949 error = 0;
1950 carp_setrun(sc, 0);
1951 }
1952 break;
1953
1954 case SIOCGVH:
1955 /* XXX: lockless read */
1956 bzero(&carpr, sizeof(carpr));
1957 carpr.carpr_state = sc->sc_state;
1958 carpr.carpr_vhid = sc->sc_vhid;
1959 carpr.carpr_advbase = sc->sc_advbase;
1960 carpr.carpr_advskew = sc->sc_advskew;
1961 error = suser(curthread);
1962 if (error == 0)
1963 bcopy(sc->sc_key, carpr.carpr_key,
1964 sizeof(carpr.carpr_key));
1965 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
1966 break;
1967
1968 default:
1969 error = EINVAL;
1970 }
1971
1972 if (locked)
1973 CARP_SCUNLOCK(sc);
1974
1975 carp_hmac_prepare(sc);
1976
1977 return (error);
1978 }
1979
1980 /*
1981 * XXX: this is looutput. We should eventually use it from there.
1982 */
1983 static int
1984 carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
1985 struct rtentry *rt)
1986 {
1987 u_int32_t af;
1988
1989 M_ASSERTPKTHDR(m); /* check if we have the packet header */
1990
1991 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
1992 m_freem(m);
1993 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
1994 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
1995 }
1996
1997 ifp->if_opackets++;
1998 ifp->if_obytes += m->m_pkthdr.len;
1999
2000 /* BPF writes need to be handled specially. */
2001 if (dst->sa_family == AF_UNSPEC) {
2002 bcopy(dst->sa_data, &af, sizeof(af));
2003 dst->sa_family = af;
2004 }
2005
2006 #if 1 /* XXX */
2007 switch (dst->sa_family) {
2008 case AF_INET:
2009 case AF_INET6:
2010 case AF_IPX:
2011 case AF_APPLETALK:
2012 break;
2013 default:
2014 m_freem(m);
2015 return (EAFNOSUPPORT);
2016 }
2017 #endif
2018 return(if_simloop(ifp, m, dst->sa_family, 0));
2019 }
2020
2021 /*
2022 * Start output on carp interface. This function should never be called.
2023 */
2024 static void
2025 carp_start(struct ifnet *ifp)
2026 {
2027 #ifdef DEBUG
2028 kprintf("%s: start called\n", ifp->if_xname);
2029 #endif
2030 }
2031
2032 int
2033 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
2034 struct rtentry *rt)
2035 {
2036 struct m_tag *mtag;
2037 struct carp_softc *sc;
2038 struct ifnet *carp_ifp;
2039
2040 if (!sa)
2041 return (0);
2042
2043 switch (sa->sa_family) {
2044 #ifdef INET
2045 case AF_INET:
2046 break;
2047 #endif /* INET */
2048 #ifdef INET6
2049 case AF_INET6:
2050 break;
2051 #endif /* INET6 */
2052 default:
2053 return (0);
2054 }
2055
2056 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL);
2057 if (mtag == NULL)
2058 return (0);
2059
2060 bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *));
2061 sc = carp_ifp->if_softc;
2062
2063 /* Set the source MAC address to Virtual Router MAC Address */
2064 switch (ifp->if_type) {
2065 case IFT_ETHER:
2066 case IFT_L2VLAN: {
2067 struct ether_header *eh;
2068
2069 eh = mtod(m, struct ether_header *);
2070 eh->ether_shost[0] = 0;
2071 eh->ether_shost[1] = 0;
2072 eh->ether_shost[2] = 0x5e;
2073 eh->ether_shost[3] = 0;
2074 eh->ether_shost[4] = 1;
2075 eh->ether_shost[5] = sc->sc_vhid;
2076 }
2077 break;
2078 default:
2079 kprintf("%s: carp is not supported for this interface type\n",
2080 ifp->if_xname);
2081 return (EOPNOTSUPP);
2082 }
2083
2084 return (0);
2085
2086 }
2087
2088 static void
2089 carp_set_state(struct carp_softc *sc, int state)
2090 {
2091
2092 if (sc->sc_carpdev)
2093 CARP_SCLOCK_ASSERT(sc);
2094
2095 if (sc->sc_state == state)
2096 return;
2097
2098 sc->sc_state = state;
2099 switch (state) {
2100 case BACKUP:
2101 SC2IFP(sc)->if_link_state = LINK_STATE_DOWN;
2102 break;
2103 case MASTER:
2104 SC2IFP(sc)->if_link_state = LINK_STATE_UP;
2105 break;
2106 default:
2107 SC2IFP(sc)->if_link_state = LINK_STATE_UNKNOWN;
2108 break;
2109 }
2110 rt_ifmsg(SC2IFP(sc));
2111 }
2112
2113 void
2114 carp_carpdev_state(void *v)
2115 {
2116 struct carp_if *cif = v;
2117
2118 CARP_LOCK(cif);
2119 carp_carpdev_state_locked(cif);
2120 CARP_UNLOCK(cif);
2121 }
2122
2123 static void
2124 carp_carpdev_state_locked(struct carp_if *cif)
2125 {
2126 struct carp_softc *sc;
2127
2128 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
2129 carp_sc_state_locked(sc);
2130 }
2131
2132 static void
2133 carp_sc_state_locked(struct carp_softc *sc)
2134 {
2135 CARP_SCLOCK_ASSERT(sc);
2136
2137 if ( !(sc->sc_carpdev->if_flags & IFF_UP)) {
2138 sc->sc_flags_backup = SC2IFP(sc)->if_flags;
2139 SC2IFP(sc)->if_flags &= ~IFF_UP;
2140 SC2IFP(sc)->if_flags &= ~IFF_RUNNING;
2141 callout_stop(&sc->sc_ad_tmo);
2142 callout_stop(&sc->sc_md_tmo);
2143 callout_stop(&sc->sc_md6_tmo);
2144 carp_set_state(sc, INIT);
2145 carp_setrun(sc, 0);
2146 if (!sc->sc_suppress) {
2147 carp_suppress_preempt++;
2148 if (carp_suppress_preempt == 1) {
2149 CARP_SCUNLOCK(sc);
2150 carp_send_ad_all();
2151 CARP_SCLOCK(sc);
2152 }
2153 }
2154 sc->sc_suppress = 1;
2155 } else {
2156 SC2IFP(sc)->if_flags |= sc->sc_flags_backup;
2157 carp_set_state(sc, INIT);
2158 carp_setrun(sc, 0);
2159 if (sc->sc_suppress)
2160 carp_suppress_preempt--;
2161 sc->sc_suppress = 0;
2162 }
2163
2164 return;
2165 }
2166
2167 static int
2168 carp_modevent(module_t mod, int type, void *data)
2169 {
2170 switch (type) {
2171 case MOD_LOAD:
2172 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
2173 carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY);
2174 if (if_detach_event_tag == NULL)
2175 return (ENOMEM);
2176
2177 LIST_INIT(&carpif_list);
2178 if_clone_attach(&carp_cloner);
2179 break;
2180
2181 case MOD_UNLOAD:
2182 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag);
2183 if_clone_detach(&carp_cloner);
2184 break;
2185
2186 default:
2187 return (EINVAL);
2188 }
2189
2190 return (0);
2191 }
2192
2193 static moduledata_t carp_mod = {
2194 "carp",
2195 carp_modevent,
2196 0
2197 };
2198
2199 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
DragonFly BSD