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- Regroup type declaration
[dragonfly.git] / sys / netinet / ip_carp.c
blob32acfd9c995495e9969ef1bfc88fb2b665c78414
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 1.10 2008/07/27 10:06:57 sephe Exp $
29 */
30
31 #include "opt_carp.h"
32 #include "opt_inet.h"
33 #include "opt_inet6.h"
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #include <sys/in_cksum.h>
39 #include <sys/limits.h>
40 #include <sys/lock.h>
41 #include <sys/malloc.h>
42 #include <sys/mbuf.h>
43 #include <sys/time.h>
44 #include <sys/proc.h>
45 #include <sys/sockio.h>
46 #include <sys/socket.h>
47 #include <sys/sysctl.h>
48 #include <sys/syslog.h>
49
50 #include <machine/stdarg.h>
51 #include <crypto/sha1.h>
52
53 #include <net/bpf.h>
54 #include <net/ethernet.h>
55 #include <net/if.h>
56 #include <net/if_dl.h>
57 #include <net/if_types.h>
58 #include <net/route.h>
59 #include <net/if_clone.h>
60
61 #ifdef INET
62 #include <netinet/in.h>
63 #include <netinet/in_var.h>
64 #include <netinet/in_systm.h>
65 #include <netinet/ip.h>
66 #include <netinet/ip_var.h>
67 #include <netinet/if_ether.h>
68 #endif
69
70 #ifdef INET6
71 #include <netinet/icmp6.h>
72 #include <netinet/ip6.h>
73 #include <netinet6/ip6_var.h>
74 #include <netinet6/scope6_var.h>
75 #include <netinet6/nd6.h>
76 #endif
77
78 #include <netinet/ip_carp.h>
79
80 #define CARP_IFNAME "carp"
81 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces");
82 static MALLOC_DEFINE(M_IFNET, "IFNET", "IFNET CARP?");
83 SYSCTL_DECL(_net_inet_carp);
84
85 struct carp_softc {
86 struct ifnet *sc_ifp; /* Interface clue */
87 struct ifnet *sc_carpdev; /* parent interface */
88 struct in_ifaddr *sc_ia; /* primary iface address */
89 struct ip_moptions sc_imo;
90 #ifdef INET6
91 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */
92 struct ip6_moptions sc_im6o;
93 #endif /* INET6 */
94 TAILQ_ENTRY(carp_softc) sc_list;
95
96 enum { INIT = 0, BACKUP, MASTER }
97 sc_state;
98
99 int sc_flags_backup;
100 int sc_suppress;
101
102 int sc_sendad_errors;
103 #define CARP_SENDAD_MAX_ERRORS 3
104 int sc_sendad_success;
105 #define CARP_SENDAD_MIN_SUCCESS 3
106
107 int sc_vhid;
108 int sc_advskew;
109 int sc_naddrs;
110 int sc_naddrs6;
111 int sc_advbase; /* seconds */
112 int sc_init_counter;
113 uint64_t sc_counter;
114
115 /* authentication */
116 #define CARP_HMAC_PAD 64
117 unsigned char sc_key[CARP_KEY_LEN];
118 unsigned char sc_pad[CARP_HMAC_PAD];
119 SHA1_CTX sc_sha1;
120
121 struct callout sc_ad_tmo; /* advertisement timeout */
122 struct callout sc_md_tmo; /* master down timeout */
123 struct callout sc_md6_tmo; /* master down timeout */
124
125 LIST_ENTRY(carp_softc) sc_next; /* Interface clue */
126 };
127 #define SC2IFP(sc) ((sc)->sc_ifp)
128
129 struct carp_if {
130 TAILQ_HEAD(, carp_softc) vhif_vrs;
131 int vhif_nvrs;
132
133 struct ifnet *vhif_ifp;
134 struct lock vhif_lock;
135 };
136
137 enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING };
138
139 int carp_suppress_preempt = 0;
140 int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */
141 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW,
142 &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets");
143 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW,
144 &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode");
145 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW,
146 &carp_opts[CARPCTL_LOG], 0, "log bad carp packets");
147 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW,
148 &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses");
149 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD,
150 &carp_suppress_preempt, 0, "Preemption is suppressed");
151
152 struct carpstats carpstats;
153 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW,
154 &carpstats, carpstats,
155 "CARP statistics (struct carpstats, netinet/ip_carp.h)");
156
157 /* Get carp_if from softc. Valid after carp_set_addr{,6}. */
158 #define SC2CIF(sc) ((struct carp_if *)(sc)->sc_carpdev->if_carp)
159
160 #define CARP_LOCK_INIT(cif) lockinit(&(cif)->vhif_lock, "carp_if", 0, 0);
161 #define CARP_LOCK_DESTROY(cif) ;
162 #define CARP_LOCK_ASSERT(cif) ;
163 #define CARP_LOCK(cif) lockmgr(&(cif)->vhif_lock, LK_EXCLUSIVE);
164 #define CARP_UNLOCK(cif) lockmgr(&(cif)->vhif_lock, LK_RELEASE);
165
166 #define CARP_SCLOCK(sc) lockmgr(&SC2CIF(sc)->vhif_lock, LK_EXCLUSIVE);
167 #define CARP_SCUNLOCK(sc) lockmgr(&SC2CIF(sc)->vhif_lock, LK_RELEASE);
168 #define CARP_SCLOCK_ASSERT(sc) ;
169
170 #define CARP_LOG(...) do { \
171 if (carp_opts[CARPCTL_LOG] > 0) \
172 log(LOG_INFO, __VA_ARGS__); \
173 } while (0)
174
175 #define CARP_DEBUG(...) do { \
176 if (carp_opts[CARPCTL_LOG] > 1) \
177 log(LOG_DEBUG, __VA_ARGS__); \
178 } while (0)
179
180 static void carp_hmac_prepare(struct carp_softc *);
181 static void carp_hmac_generate(struct carp_softc *, uint32_t *,
182 unsigned char *);
183 static int carp_hmac_verify(struct carp_softc *, uint32_t *,
184 unsigned char *);
185 static void carp_setroute(struct carp_softc *, int);
186 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t);
187 static int carp_clone_create(struct if_clone *, int);
188 static void carp_clone_destroy(struct ifnet *);
189 static void carpdetach(struct carp_softc *, int);
190 static int carp_prepare_ad(struct mbuf *, struct carp_softc *,
191 struct carp_header *);
192 static void carp_send_ad_all(void);
193 static void carp_send_ad(void *);
194 static void carp_send_ad_locked(struct carp_softc *);
195 static void carp_send_arp(struct carp_softc *);
196 static void carp_master_down(void *);
197 static void carp_master_down_locked(struct carp_softc *);
198 static int carp_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
199 static int carp_looutput(struct ifnet *, struct mbuf *, struct sockaddr *,
200 struct rtentry *);
201 static void carp_start(struct ifnet *);
202 static void carp_setrun(struct carp_softc *, sa_family_t);
203 static void carp_set_state(struct carp_softc *, int);
204 static int carp_addrcount(struct carp_if *, struct in_ifaddr *, int);
205
206 static void carp_multicast_cleanup(struct carp_softc *);
207 static int carp_set_addr(struct carp_softc *, struct sockaddr_in *);
208 static int carp_del_addr(struct carp_softc *, struct sockaddr_in *);
209 static void carp_carpdev_state_locked(struct carp_if *);
210 static void carp_sc_state_locked(struct carp_softc *);
211 #ifdef INET6
212 static void carp_send_na(struct carp_softc *);
213 static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *);
214 static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *);
215 static void carp_multicast6_cleanup(struct carp_softc *);
216 #endif
217
218 static LIST_HEAD(, carp_softc) carpif_list;
219
220 static struct if_clone carp_cloner =
221 IF_CLONE_INITIALIZER(CARP_IFNAME, carp_clone_create, carp_clone_destroy,
222 0, IF_MAXUNIT);
223
224 static eventhandler_tag carp_ifdetach_event;
225
226 static __inline uint16_t
227 carp_cksum(struct mbuf *m, int len)
228 {
229 return (in_cksum(m, len));
230 }
231
232 static void
233 carp_hmac_prepare(struct carp_softc *sc)
234 {
235 uint8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
236 uint8_t vhid = sc->sc_vhid & 0xff;
237 struct ifaddr_container *ifac;
238 int i;
239 #ifdef INET6
240 struct in6_addr in6;
241 #endif
242
243 if (sc->sc_carpdev)
244 CARP_SCLOCK(sc);
245
246 /* XXX: possible race here */
247
248 /* compute ipad from key */
249 bzero(sc->sc_pad, sizeof(sc->sc_pad));
250 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
251 for (i = 0; i < sizeof(sc->sc_pad); i++)
252 sc->sc_pad[i] ^= 0x36;
253
254 /* precompute first part of inner hash */
255 SHA1Init(&sc->sc_sha1);
256 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
257 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
258 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
259 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
260 #ifdef INET
261 TAILQ_FOREACH(ifac, &SC2IFP(sc)->if_addrheads[mycpuid], ifa_link) {
262 struct ifaddr *ifa = ifac->ifa;
263
264 if (ifa->ifa_addr->sa_family == AF_INET)
265 SHA1Update(&sc->sc_sha1,
266 (void *)&ifatoia(ifa)->ia_addr.sin_addr.s_addr,
267 sizeof(struct in_addr));
268 }
269 #endif /* INET */
270 #ifdef INET6
271 TAILQ_FOREACH(ifac, &SC2IFP(sc)->if_addrheads[mycpuid], ifa_link) {
272 struct ifaddr *ifa = ifac->ifa;
273
274 if (ifa->ifa_addr->sa_family == AF_INET6) {
275 in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
276 in6_clearscope(&in6);
277 SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6));
278 }
279 }
280 #endif /* INET6 */
281
282 /* convert ipad to opad */
283 for (i = 0; i < sizeof(sc->sc_pad); i++)
284 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
285
286 if (sc->sc_carpdev)
287 CARP_SCUNLOCK(sc);
288 }
289
290 static void
291 carp_hmac_generate(struct carp_softc *sc, uint32_t counter[2],
292 unsigned char md[20])
293 {
294 SHA1_CTX sha1ctx;
295
296 /* fetch first half of inner hash */
297 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
298
299 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
300 SHA1Final(md, &sha1ctx);
301
302 /* outer hash */
303 SHA1Init(&sha1ctx);
304 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
305 SHA1Update(&sha1ctx, md, 20);
306 SHA1Final(md, &sha1ctx);
307 }
308
309 static int
310 carp_hmac_verify(struct carp_softc *sc, uint32_t counter[2],
311 unsigned char md[20])
312 {
313 unsigned char md2[20];
314
315 CARP_SCLOCK_ASSERT(sc);
316
317 carp_hmac_generate(sc, counter, md2);
318
319 return (bcmp(md, md2, sizeof(md2)));
320 }
321
322 static void
323 carp_setroute(struct carp_softc *sc, int cmd)
324 {
325 struct ifaddr_container *ifac;
326
327 if (sc->sc_carpdev)
328 CARP_SCLOCK_ASSERT(sc);
329
330 crit_enter();
331 TAILQ_FOREACH(ifac, &SC2IFP(sc)->if_addrheads[mycpuid], ifa_link) {
332 struct ifaddr *ifa = ifac->ifa;
333
334 if (ifa->ifa_addr->sa_family == AF_INET &&
335 sc->sc_carpdev != NULL) {
336 int count = carp_addrcount(
337 (struct carp_if *)sc->sc_carpdev->if_carp,
338 ifatoia(ifa), CARP_COUNT_MASTER);
339
340 if ((cmd == RTM_ADD && count == 1) ||
341 (cmd == RTM_DELETE && count == 0))
342 rtinit(ifa, cmd, RTF_UP | RTF_HOST);
343 }
344 #ifdef INET6
345 if (ifa->ifa_addr->sa_family == AF_INET6) {
346 if (cmd == RTM_ADD)
347 in6_ifaddloop(ifa);
348 else
349 in6_ifremloop(ifa);
350 }
351 #endif /* INET6 */
352 }
353 crit_exit();
354
355 }
356
357 static int
358 carp_clone_create(struct if_clone *ifc, int unit)
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) = kmalloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO);
366
367 sc->sc_flags_backup = 0;
368 sc->sc_suppress = 0;
369 sc->sc_advbase = CARP_DFLTINTV;
370 sc->sc_vhid = -1; /* required setting */
371 sc->sc_advskew = 0;
372 sc->sc_init_counter = 1;
373 sc->sc_naddrs = sc->sc_naddrs6 = 0; /* M_ZERO? */
374
375 #ifdef INET6
376 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
377 #endif
378
379 /* sc->sc_imo.imo_membership = kmalloc((sizeof(struct in_multi) * IP_MAX_MEMBERSHIPS), M_CARP,M_WAITOK);*/
380 /*
381 sc->sc_imo.imo_max_memberships = IP_MAX_MEMBERSHIPS;
382 sc->sc_imo.imo_multicast_vif = -1;
383 */
384 callout_init(&sc->sc_ad_tmo);
385 callout_init(&sc->sc_md_tmo);
386 callout_init(&sc->sc_md6_tmo);
387
388 ifp->if_softc = sc;
389 if_initname(ifp, CARP_IFNAME, unit);
390 ifp->if_mtu = ETHERMTU;
391 ifp->if_flags = IFF_LOOPBACK;
392 ifp->if_ioctl = carp_ioctl;
393 ifp->if_output = carp_looutput;
394 ifp->if_start = carp_start;
395 ifp->if_type = IFT_CARP;
396 ifp->if_snd.ifq_maxlen = ifqmaxlen;
397 ifp->if_hdrlen = 0;
398 if_attach(ifp, NULL);
399 bpfattach(ifp, DLT_NULL, sizeof(u_int));
400
401 crit_enter();
402 LIST_INSERT_HEAD(&carpif_list, sc, sc_next);
403 crit_exit();
404
405 return (0);
406 }
407
408 static void
409 carp_clone_destroy(struct ifnet *ifp)
410 {
411 struct carp_softc *sc = ifp->if_softc;
412
413 if (sc->sc_carpdev)
414 CARP_SCLOCK(sc);
415 carpdetach(sc, 1); /* Returns unlocked. */
416
417 crit_enter();
418 LIST_REMOVE(sc, sc_next);
419 crit_exit();
420 bpfdetach(ifp);
421 if_detach(ifp);
422 /* if_free_type(ifp, IFT_ETHER);*/
423 /* kfree(sc->sc_imo.imo_membership, M_CARP); */
424 kfree(sc, M_CARP);
425 }
426
427 /*
428 * This function can be called on CARP interface destroy path,
429 * and in case of the removal of the underlying interface as
430 * well. We differentiate these two cases. In the latter case
431 * we do not cleanup our multicast memberships, since they
432 * are already freed. Also, in the latter case we do not
433 * release the lock on return, because the function will be
434 * called once more, for another CARP instance on the same
435 * interface.
436 */
437 static void
438 carpdetach(struct carp_softc *sc, int unlock)
439 {
440 struct carp_if *cif;
441
442 callout_stop(&sc->sc_ad_tmo);
443 callout_stop(&sc->sc_md_tmo);
444 callout_stop(&sc->sc_md6_tmo);
445
446 if (sc->sc_suppress)
447 carp_suppress_preempt--;
448 sc->sc_suppress = 0;
449
450 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
451 carp_suppress_preempt--;
452 sc->sc_sendad_errors = 0;
453
454 carp_set_state(sc, INIT);
455 SC2IFP(sc)->if_flags &= ~IFF_UP;
456 carp_setrun(sc, 0);
457 if (unlock)
458 carp_multicast_cleanup(sc);
459 #ifdef INET6
460 carp_multicast6_cleanup(sc);
461 #endif
462
463 if (sc->sc_carpdev != NULL) {
464 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
465 CARP_LOCK_ASSERT(cif);
466 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
467 if (!--cif->vhif_nvrs) {
468 ifpromisc(sc->sc_carpdev, 0);
469 sc->sc_carpdev->if_carp = NULL;
470 CARP_LOCK_DESTROY(cif);
471 FREE(cif, M_IFADDR);
472 } else if (unlock)
473 CARP_UNLOCK(cif);
474 sc->sc_carpdev = NULL;
475 }
476 }
477
478 /* Detach an interface from the carp. */
479 static void
480 carp_ifdetach(void *arg __unused, struct ifnet *ifp)
481 {
482 struct carp_if *cif = (struct carp_if *)ifp->if_carp;
483 struct carp_softc *sc, *nextsc;
484
485 if (cif == NULL)
486 return;
487
488 /*
489 * XXX: At the end of for() cycle the lock will be destroyed.
490 */
491 CARP_LOCK(cif);
492 for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) {
493 nextsc = TAILQ_NEXT(sc, sc_list);
494 carpdetach(sc, 0);
495 }
496 CARP_UNLOCK(cif);
497 }
498
499 /*
500 * process input packet.
501 * we have rearranged checks order compared to the rfc,
502 * but it seems more efficient this way or not possible otherwise.
503 */
504 void
505 carp_input(struct mbuf *m, ...)
506 {
507 struct ip *ip = mtod(m, struct ip *);
508 struct carp_header *ch;
509 int iplen, len, hlen;
510 __va_list ap;
511
512 __va_start(ap, m);
513 hlen = __va_arg(ap, int);
514 __va_end(ap);
515
516 carpstats.carps_ipackets++;
517
518 if (!carp_opts[CARPCTL_ALLOW]) {
519 m_freem(m);
520 return;
521 }
522
523 /* check if received on a valid carp interface */
524 if (m->m_pkthdr.rcvif->if_carp == NULL) {
525 carpstats.carps_badif++;
526 CARP_LOG("carp_input: packet received on non-carp "
527 "interface: %s\n",
528 m->m_pkthdr.rcvif->if_xname);
529 m_freem(m);
530 return;
531 }
532
533 /* verify that the IP TTL is 255. */
534 if (ip->ip_ttl != CARP_DFLTTL) {
535 carpstats.carps_badttl++;
536 CARP_LOG("carp_input: received ttl %d != 255i on %s\n",
537 ip->ip_ttl,
538 m->m_pkthdr.rcvif->if_xname);
539 m_freem(m);
540 return;
541 }
542
543 iplen = ip->ip_hl << 2;
544
545 if (m->m_pkthdr.len < iplen + sizeof(*ch)) {
546 carpstats.carps_badlen++;
547 CARP_LOG("carp_input: received len %zd < "
548 "sizeof(struct carp_header)\n",
549 m->m_len - sizeof(struct ip));
550 m_freem(m);
551 return;
552 }
553
554 if (iplen + sizeof(*ch) < m->m_len) {
555 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) {
556 carpstats.carps_hdrops++;
557 CARP_LOG("carp_input: pullup failed\n");
558 return;
559 }
560 ip = mtod(m, struct ip *);
561 }
562 ch = (struct carp_header *)((char *)ip + iplen);
563
564 /*
565 * verify that the received packet length is
566 * equal to the CARP header
567 */
568 len = iplen + sizeof(*ch);
569 if (len > m->m_pkthdr.len) {
570 carpstats.carps_badlen++;
571 CARP_LOG("carp_input: packet too short %d on %s\n",
572 m->m_pkthdr.len,
573 m->m_pkthdr.rcvif->if_xname);
574 m_freem(m);
575 return;
576 }
577
578 if ((m = m_pullup(m, len)) == NULL) {
579 carpstats.carps_hdrops++;
580 return;
581 }
582 ip = mtod(m, struct ip *);
583 ch = (struct carp_header *)((char *)ip + iplen);
584
585 /* verify the CARP checksum */
586 m->m_data += iplen;
587 if (carp_cksum(m, len - iplen)) {
588 carpstats.carps_badsum++;
589 CARP_LOG("carp_input: checksum failed on %s\n",
590 m->m_pkthdr.rcvif->if_xname);
591 m_freem(m);
592 return;
593 }
594 m->m_data -= iplen;
595
596 carp_input_c(m, ch, AF_INET);
597 }
598
599 #ifdef INET6
600 int
601 carp6_input(struct mbuf **mp, int *offp, int proto)
602 {
603 struct mbuf *m = *mp;
604 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
605 struct carp_header *ch;
606 u_int len;
607
608 carpstats.carps_ipackets6++;
609
610 if (!carp_opts[CARPCTL_ALLOW]) {
611 m_freem(m);
612 return (IPPROTO_DONE);
613 }
614
615 /* check if received on a valid carp interface */
616 if (m->m_pkthdr.rcvif->if_carp == NULL) {
617 carpstats.carps_badif++;
618 CARP_LOG("carp6_input: packet received on non-carp "
619 "interface: %s\n",
620 m->m_pkthdr.rcvif->if_xname);
621 m_freem(m);
622 return (IPPROTO_DONE);
623 }
624
625 /* verify that the IP TTL is 255 */
626 if (ip6->ip6_hlim != CARP_DFLTTL) {
627 carpstats.carps_badttl++;
628 CARP_LOG("carp6_input: received ttl %d != 255 on %s\n",
629 ip6->ip6_hlim,
630 m->m_pkthdr.rcvif->if_xname);
631 m_freem(m);
632 return (IPPROTO_DONE);
633 }
634
635 /* verify that we have a complete carp packet */
636 len = m->m_len;
637 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
638 if (ch == NULL) {
639 carpstats.carps_badlen++;
640 CARP_LOG("carp6_input: packet size %u too small\n", len);
641 return (IPPROTO_DONE);
642 }
643
644
645 /* verify the CARP checksum */
646 m->m_data += *offp;
647 if (carp_cksum(m, sizeof(*ch))) {
648 carpstats.carps_badsum++;
649 CARP_LOG("carp6_input: checksum failed, on %s\n",
650 m->m_pkthdr.rcvif->if_xname);
651 m_freem(m);
652 return (IPPROTO_DONE);
653 }
654 m->m_data -= *offp;
655
656 carp_input_c(m, ch, AF_INET6);
657 return (IPPROTO_DONE);
658 }
659 #endif /* INET6 */
660
661 static void
662 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af)
663 {
664 struct ifnet *ifp = m->m_pkthdr.rcvif;
665 struct carp_softc *sc;
666 uint64_t tmp_counter;
667 struct timeval sc_tv, ch_tv;
668
669 /* verify that the VHID is valid on the receiving interface */
670 CARP_LOCK(ifp->if_carp);
671 TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list)
672 if (sc->sc_vhid == ch->carp_vhid)
673 break;
674
675 if (!sc || !((SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING))) {
676 carpstats.carps_badvhid++;
677 CARP_UNLOCK(ifp->if_carp);
678 m_freem(m);
679 return;
680 }
681
682 getmicrotime(&SC2IFP(sc)->if_lastchange);
683 SC2IFP(sc)->if_ipackets++;
684 SC2IFP(sc)->if_ibytes += m->m_pkthdr.len;
685
686 if (SC2IFP(sc)->if_bpf) {
687 struct ip *ip = mtod(m, struct ip *);
688
689 /* BPF wants net byte order */
690 ip->ip_len = htons(ip->ip_len + (ip->ip_hl << 2));
691 ip->ip_off = htons(ip->ip_off);
692 bpf_mtap(SC2IFP(sc)->if_bpf, m);
693 }
694
695 /* verify the CARP version. */
696 if (ch->carp_version != CARP_VERSION) {
697 carpstats.carps_badver++;
698 SC2IFP(sc)->if_ierrors++;
699 CARP_UNLOCK(ifp->if_carp);
700 CARP_LOG("%s; invalid version %d\n",
701 SC2IFP(sc)->if_xname,
702 ch->carp_version);
703 m_freem(m);
704 return;
705 }
706
707 /* verify the hash */
708 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
709 carpstats.carps_badauth++;
710 SC2IFP(sc)->if_ierrors++;
711 CARP_UNLOCK(ifp->if_carp);
712 CARP_LOG("%s: incorrect hash\n", SC2IFP(sc)->if_xname);
713 m_freem(m);
714 return;
715 }
716
717 tmp_counter = ntohl(ch->carp_counter[0]);
718 tmp_counter = tmp_counter<<32;
719 tmp_counter += ntohl(ch->carp_counter[1]);
720
721 /* XXX Replay protection goes here */
722
723 sc->sc_init_counter = 0;
724 sc->sc_counter = tmp_counter;
725
726 sc_tv.tv_sec = sc->sc_advbase;
727 if (carp_suppress_preempt && sc->sc_advskew < 240)
728 sc_tv.tv_usec = 240 * 1000000 / 256;
729 else
730 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256;
731 ch_tv.tv_sec = ch->carp_advbase;
732 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
733
734 switch (sc->sc_state) {
735 case INIT:
736 break;
737 case MASTER:
738 /*
739 * If we receive an advertisement from a master who's going to
740 * be more frequent than us, go into BACKUP state.
741 */
742 if (timevalcmp(&sc_tv, &ch_tv, >) ||
743 timevalcmp(&sc_tv, &ch_tv, ==)) {
744 callout_stop(&sc->sc_ad_tmo);
745 CARP_DEBUG("%s: MASTER -> BACKUP "
746 "(more frequent advertisement received)\n",
747 SC2IFP(sc)->if_xname);
748 carp_set_state(sc, BACKUP);
749 carp_setrun(sc, 0);
750 carp_setroute(sc, RTM_DELETE);
751 }
752 break;
753 case BACKUP:
754 /*
755 * If we're pre-empting masters who advertise slower than us,
756 * and this one claims to be slower, treat him as down.
757 */
758 if (carp_opts[CARPCTL_PREEMPT] &&
759 timevalcmp(&sc_tv, &ch_tv, <)) {
760 CARP_DEBUG("%s: BACKUP -> MASTER "
761 "(preempting a slower master)\n",
762 SC2IFP(sc)->if_xname);
763 carp_master_down_locked(sc);
764 break;
765 }
766
767 /*
768 * If the master is going to advertise at such a low frequency
769 * that he's guaranteed to time out, we'd might as well just
770 * treat him as timed out now.
771 */
772 sc_tv.tv_sec = sc->sc_advbase * 3;
773 if (timevalcmp(&sc_tv, &ch_tv, <)) {
774 CARP_DEBUG("%s: BACKUP -> MASTER "
775 "(master timed out)\n",
776 SC2IFP(sc)->if_xname);
777 carp_master_down_locked(sc);
778 break;
779 }
780
781 /*
782 * Otherwise, we reset the counter and wait for the next
783 * advertisement.
784 */
785 carp_setrun(sc, af);
786 break;
787 }
788
789 CARP_UNLOCK(ifp->if_carp);
790
791 m_freem(m);
792 return;
793 }
794
795 static int
796 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch)
797 {
798 struct m_tag *mtag;
799 struct ifnet *ifp = SC2IFP(sc);
800
801 if (sc->sc_init_counter) {
802 /* this could also be seconds since unix epoch */
803 sc->sc_counter = karc4random();
804 sc->sc_counter = sc->sc_counter << 32;
805 sc->sc_counter += karc4random();
806 } else
807 sc->sc_counter++;
808
809 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff);
810 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff);
811
812 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
813
814 /* Tag packet for carp_output */
815 mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct ifnet *), MB_DONTWAIT);
816 if (mtag == NULL) {
817 m_freem(m);
818 SC2IFP(sc)->if_oerrors++;
819 return (ENOMEM);
820 }
821 bcopy(&ifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *));
822 m_tag_prepend(m, mtag);
823
824 return (0);
825 }
826
827 static void
828 carp_send_ad_all(void)
829 {
830 struct carp_softc *sc;
831
832 LIST_FOREACH(sc, &carpif_list, sc_next) {
833 if (sc->sc_carpdev == NULL)
834 continue;
835 CARP_SCLOCK(sc);
836 if ((SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING) &&
837 sc->sc_state == MASTER)
838 carp_send_ad_locked(sc);
839 CARP_SCUNLOCK(sc);
840 }
841 }
842
843 static void
844 carp_send_ad(void *v)
845 {
846 struct carp_softc *sc = v;
847
848 CARP_SCLOCK(sc);
849 carp_send_ad_locked(sc);
850 CARP_SCUNLOCK(sc);
851 }
852
853 static void
854 carp_send_ad_locked(struct carp_softc *sc)
855 {
856 struct carp_header ch;
857 struct timeval tv;
858 struct carp_header *ch_ptr;
859 struct mbuf *m;
860 int len, advbase, advskew;
861
862
863 /* bow out if we've lost our UPness or RUNNINGuiness */
864 if (!((SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING))) {
865 advbase = 255;
866 advskew = 255;
867 } else {
868 advbase = sc->sc_advbase;
869 if (!carp_suppress_preempt || sc->sc_advskew > 240)
870 advskew = sc->sc_advskew;
871 else
872 advskew = 240;
873 tv.tv_sec = advbase;
874 tv.tv_usec = advskew * 1000000 / 256;
875 }
876
877 ch.carp_version = CARP_VERSION;
878 ch.carp_type = CARP_ADVERTISEMENT;
879 ch.carp_vhid = sc->sc_vhid;
880 ch.carp_advbase = advbase;
881 ch.carp_advskew = advskew;
882 ch.carp_authlen = 7; /* XXX DEFINE */
883 ch.carp_pad1 = 0; /* must be zero */
884 ch.carp_cksum = 0;
885
886 #ifdef INET
887 if (sc->sc_ia) {
888 struct ip *ip;
889
890 MGETHDR(m, M_NOWAIT, MT_HEADER);
891 if (m == NULL) {
892 SC2IFP(sc)->if_oerrors++;
893 carpstats.carps_onomem++;
894 /* XXX maybe less ? */
895 if (advbase != 255 || advskew != 255)
896 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
897 carp_send_ad, sc);
898 return;
899 }
900 len = sizeof(*ip) + sizeof(ch);
901 m->m_pkthdr.len = len;
902 m->m_pkthdr.rcvif = NULL;
903 m->m_len = len;
904 MH_ALIGN(m, m->m_len);
905 m->m_flags |= M_MCAST;
906 ip = mtod(m, struct ip *);
907 ip->ip_v = IPVERSION;
908 ip->ip_hl = sizeof(*ip) >> 2;
909 ip->ip_tos = IPTOS_LOWDELAY;
910 ip->ip_len = len;
911 ip->ip_id = ip_newid();
912 ip->ip_off = IP_DF;
913 ip->ip_ttl = CARP_DFLTTL;
914 ip->ip_p = IPPROTO_CARP;
915 ip->ip_sum = 0;
916 ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr;
917 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
918
919 ch_ptr = (struct carp_header *)(&ip[1]);
920 bcopy(&ch, ch_ptr, sizeof(ch));
921 if (carp_prepare_ad(m, sc, ch_ptr))
922 return;
923
924 m->m_data += sizeof(*ip);
925 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip));
926 m->m_data -= sizeof(*ip);
927
928 getmicrotime(&SC2IFP(sc)->if_lastchange);
929 SC2IFP(sc)->if_opackets++;
930 SC2IFP(sc)->if_obytes += len;
931 carpstats.carps_opackets++;
932
933 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) {
934 SC2IFP(sc)->if_oerrors++;
935 if (sc->sc_sendad_errors < INT_MAX)
936 sc->sc_sendad_errors++;
937 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
938 carp_suppress_preempt++;
939 if (carp_suppress_preempt == 1) {
940 CARP_SCUNLOCK(sc);
941 carp_send_ad_all();
942 CARP_SCLOCK(sc);
943 }
944 }
945 sc->sc_sendad_success = 0;
946 } else {
947 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
948 if (++sc->sc_sendad_success >=
949 CARP_SENDAD_MIN_SUCCESS) {
950 carp_suppress_preempt--;
951 sc->sc_sendad_errors = 0;
952 }
953 } else
954 sc->sc_sendad_errors = 0;
955 }
956 }
957 #endif /* INET */
958 #ifdef INET6
959 if (sc->sc_ia6) {
960 struct ip6_hdr *ip6;
961
962 MGETHDR(m, M_NOWAIT, MT_HEADER);
963 if (m == NULL) {
964 SC2IFP(sc)->if_oerrors++;
965 carpstats.carps_onomem++;
966 /* XXX maybe less ? */
967 if (advbase != 255 || advskew != 255)
968 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
969 carp_send_ad, sc);
970 return;
971 }
972 len = sizeof(*ip6) + sizeof(ch);
973 m->m_pkthdr.len = len;
974 m->m_pkthdr.rcvif = NULL;
975 m->m_len = len;
976 MH_ALIGN(m, m->m_len);
977 m->m_flags |= M_MCAST;
978 ip6 = mtod(m, struct ip6_hdr *);
979 bzero(ip6, sizeof(*ip6));
980 ip6->ip6_vfc |= IPV6_VERSION;
981 ip6->ip6_hlim = CARP_DFLTTL;
982 ip6->ip6_nxt = IPPROTO_CARP;
983 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src,
984 sizeof(struct in6_addr));
985 /* set the multicast destination */
986
987 ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
988 ip6->ip6_dst.s6_addr8[15] = 0x12;
989 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
990 SC2IFP(sc)->if_oerrors++;
991 m_freem(m);
992 CARP_LOG("%s: in6_setscope failed\n", __func__);
993 return;
994 }
995
996 ch_ptr = (struct carp_header *)(&ip6[1]);
997 bcopy(&ch, ch_ptr, sizeof(ch));
998 if (carp_prepare_ad(m, sc, ch_ptr))
999 return;
1000
1001 m->m_data += sizeof(*ip6);
1002 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6));
1003 m->m_data -= sizeof(*ip6);
1004
1005 getmicrotime(&SC2IFP(sc)->if_lastchange);
1006 SC2IFP(sc)->if_opackets++;
1007 SC2IFP(sc)->if_obytes += len;
1008 carpstats.carps_opackets6++;
1009
1010 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) {
1011 SC2IFP(sc)->if_oerrors++;
1012 if (sc->sc_sendad_errors < INT_MAX)
1013 sc->sc_sendad_errors++;
1014 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1015 carp_suppress_preempt++;
1016 if (carp_suppress_preempt == 1) {
1017 CARP_SCUNLOCK(sc);
1018 carp_send_ad_all();
1019 CARP_SCLOCK(sc);
1020 }
1021 }
1022 sc->sc_sendad_success = 0;
1023 } else {
1024 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1025 if (++sc->sc_sendad_success >=
1026 CARP_SENDAD_MIN_SUCCESS) {
1027 carp_suppress_preempt--;
1028 sc->sc_sendad_errors = 0;
1029 }
1030 } else
1031 sc->sc_sendad_errors = 0;
1032 }
1033 }
1034 #endif /* INET6 */
1035
1036 if (advbase != 255 || advskew != 255)
1037 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1038 carp_send_ad, sc);
1039
1040 }
1041
1042 /*
1043 * Broadcast a gratuitous ARP request containing
1044 * the virtual router MAC address for each IP address
1045 * associated with the virtual router.
1046 */
1047 static void
1048 carp_send_arp(struct carp_softc *sc)
1049 {
1050 struct ifaddr_container *ifac;
1051
1052 TAILQ_FOREACH(ifac, &SC2IFP(sc)->if_addrheads[mycpuid], ifa_link) {
1053 struct ifaddr *ifa = ifac->ifa;
1054
1055 if (ifa->ifa_addr->sa_family != AF_INET)
1056 continue;
1057 arp_ifinit2(sc->sc_carpdev, ifa, IF_LLADDR(sc->sc_ifp));
1058
1059 DELAY(1000); /* XXX */
1060 }
1061 }
1062
1063 #ifdef INET6
1064 static void
1065 carp_send_na(struct carp_softc *sc)
1066 {
1067 struct ifaddr_container *ifac;
1068 struct in6_addr *in6;
1069 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1070
1071 TAILQ_FOREACH(ifac, &SC2IFP(sc)->if_addrheads[mycpuid], ifa_link) {
1072 struct ifaddr *ifa = ifac->ifa;
1073
1074 if (ifa->ifa_addr->sa_family != AF_INET6)
1075 continue;
1076
1077 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
1078 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1079 ND_NA_FLAG_OVERRIDE, 1, NULL);
1080 DELAY(1000); /* XXX */
1081 }
1082 }
1083 #endif /* INET6 */
1084
1085 static int
1086 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type)
1087 {
1088 struct carp_softc *vh;
1089 int count = 0;
1090
1091 CARP_LOCK_ASSERT(cif);
1092
1093 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1094 if ((type == CARP_COUNT_RUNNING &&
1095 (SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING)) ||
1096 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) {
1097 struct ifaddr_container *ifac;
1098
1099 TAILQ_FOREACH(ifac, &SC2IFP(vh)->if_addrheads[mycpuid],
1100 ifa_link) {
1101 struct ifaddr *ifa = ifac->ifa;
1102
1103 if (ifa->ifa_addr->sa_family == AF_INET &&
1104 ia->ia_addr.sin_addr.s_addr ==
1105 ifatoia(ifa)->ia_addr.sin_addr.s_addr)
1106 count++;
1107 }
1108 }
1109 }
1110 return (count);
1111 }
1112
1113 int
1114 carp_iamatch(void *v, struct in_ifaddr *ia,
1115 struct in_addr *isaddr, uint8_t **enaddr)
1116 {
1117 struct carp_if *cif = v;
1118 struct carp_softc *vh;
1119 int index, count = 0;
1120
1121 CARP_LOCK(cif);
1122
1123 if (carp_opts[CARPCTL_ARPBALANCE]) {
1124 /*
1125 * XXX proof of concept implementation.
1126 * We use the source ip to decide which virtual host should
1127 * handle the request. If we're master of that virtual host,
1128 * then we respond, otherwise, just drop the arp packet on
1129 * the floor.
1130 */
1131 count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING);
1132 if (count == 0) {
1133 /* should never reach this */
1134 CARP_UNLOCK(cif);
1135 return (0);
1136 }
1137
1138 /* this should be a hash, like pf_hash() */
1139 index = ntohl(isaddr->s_addr) % count;
1140 count = 0;
1141
1142 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1143 if ((SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING)) {
1144 struct ifaddr_container *ifac;
1145
1146 TAILQ_FOREACH(ifac, &SC2IFP(vh)->if_addrheads[mycpuid], ifa_link) {
1147 struct ifaddr *ifa = ifac->ifa;
1148
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) && (SC2IFP(vh)->if_flags & IFF_RUNNING) &&
1172 vh->sc_state == MASTER) {
1173 *enaddr = IF_LLADDR(vh->sc_ifp);
1174 CARP_UNLOCK(cif);
1175 return (1);
1176 }
1177 }
1178 }
1179 CARP_UNLOCK(cif);
1180 return(0);
1181 }
1182
1183 #ifdef INET6
1184 struct ifaddr *
1185 carp_iamatch6(void *v, struct in6_addr *taddr)
1186 {
1187 struct carp_if *cif = v;
1188 struct carp_softc *vh;
1189
1190 CARP_LOCK(cif);
1191 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1192 struct ifaddr_container *ifac;
1193
1194 TAILQ_FOREACH(ifac, &SC2IFP(vh)->if_addrheads[mycpuid], ifa_link) {
1195 struct ifaddr *ifa = ifac->ifa;
1196
1197 if (IN6_ARE_ADDR_EQUAL(taddr,
1198 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1199 (SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_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
1218 CARP_LOCK(cif);
1219 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
1220 struct ifaddr_container *ifac;
1221
1222 TAILQ_FOREACH(ifac, &SC2IFP(sc)->if_addrheads[mycpuid], ifa_link) {
1223 struct ifaddr *ifa = ifac->ifa;
1224
1225 if (IN6_ARE_ADDR_EQUAL(taddr,
1226 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1227 (SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING)) {
1228 struct ifnet *ifp = SC2IFP(sc);
1229 mtag = m_tag_get(PACKET_TAG_CARP,
1230 sizeof(struct ifnet *), MB_DONTWAIT);
1231 if (mtag == NULL) {
1232 /* better a bit than nothing */
1233 CARP_UNLOCK(cif);
1234 return (IF_LLADDR(sc->sc_ifp));
1235 }
1236 bcopy(&ifp, (caddr_t)(mtag + 1),
1237 sizeof(struct ifnet *));
1238 m_tag_prepend(m, mtag);
1239
1240 CARP_UNLOCK(cif);
1241 return (IF_LLADDR(sc->sc_ifp));
1242 }
1243 }
1244 }
1245 CARP_UNLOCK(cif);
1246
1247 return (NULL);
1248 }
1249 #endif
1250
1251 struct ifnet *
1252 carp_forus(void *v, void *dhost)
1253 {
1254 struct carp_if *cif = v;
1255 struct carp_softc *vh;
1256 uint8_t *ena = dhost;
1257
1258 /**
1259 * XXX: See here for check on MAC adr is not for virtual use
1260 *
1261 **/
1262
1263 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
1264 {
1265 return (NULL);
1266 }
1267
1268 CARP_LOCK(cif);
1269 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list)
1270 if ((SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING) &&
1271 vh->sc_state == MASTER &&
1272 !bcmp(dhost, IF_LLADDR(vh->sc_ifp), ETHER_ADDR_LEN)) {
1273 CARP_UNLOCK(cif);
1274 return (SC2IFP(vh));
1275 }
1276
1277 CARP_UNLOCK(cif);
1278 return (NULL);
1279 }
1280
1281 static void
1282 carp_master_down(void *v)
1283 {
1284 struct carp_softc *sc = v;
1285
1286 lwkt_serialize_enter(sc->sc_ifp->if_serializer);
1287 carp_master_down_locked(sc);
1288 lwkt_serialize_exit(sc->sc_ifp->if_serializer);
1289 }
1290
1291 static void
1292 carp_master_down_locked(struct carp_softc *sc)
1293 {
1294 if (sc->sc_carpdev)
1295 CARP_SCLOCK_ASSERT(sc);
1296
1297 switch (sc->sc_state) {
1298 case INIT:
1299 kprintf("%s: master_down event in INIT state\n",
1300 SC2IFP(sc)->if_xname);
1301 break;
1302 case MASTER:
1303 break;
1304 case BACKUP:
1305 carp_set_state(sc, MASTER);
1306 carp_send_ad_locked(sc);
1307 carp_send_arp(sc);
1308 #ifdef INET6
1309 carp_send_na(sc);
1310 #endif /* INET6 */
1311 carp_setrun(sc, 0);
1312 carp_setroute(sc, RTM_ADD);
1313 break;
1314 }
1315 }
1316
1317 /*
1318 * When in backup state, af indicates whether to reset the master down timer
1319 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1320 */
1321 static void
1322 carp_setrun(struct carp_softc *sc, sa_family_t af)
1323 {
1324 struct timeval tv;
1325
1326 if (sc->sc_carpdev == NULL) {
1327 SC2IFP(sc)->if_flags &= ~IFF_RUNNING;
1328 carp_set_state(sc, INIT);
1329 return;
1330 }
1331
1332 if (SC2IFP(sc)->if_flags & IFF_UP &&
1333 sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6))
1334 SC2IFP(sc)->if_flags |= IFF_RUNNING;
1335 else {
1336 SC2IFP(sc)->if_flags &= ~IFF_RUNNING;
1337 carp_setroute(sc, RTM_DELETE);
1338 return;
1339 }
1340
1341 switch (sc->sc_state) {
1342 case INIT:
1343 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) {
1344 carp_send_ad_locked(sc);
1345 carp_send_arp(sc);
1346 #ifdef INET6
1347 carp_send_na(sc);
1348 #endif /* INET6 */
1349 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n",
1350 SC2IFP(sc)->if_xname);
1351 carp_set_state(sc, MASTER);
1352 carp_setroute(sc, RTM_ADD);
1353 } else {
1354 CARP_DEBUG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname);
1355 carp_set_state(sc, BACKUP);
1356 carp_setroute(sc, RTM_DELETE);
1357 carp_setrun(sc, 0);
1358 }
1359 break;
1360 case BACKUP:
1361 callout_stop(&sc->sc_ad_tmo);
1362 tv.tv_sec = 3 * sc->sc_advbase;
1363 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1364 switch (af) {
1365 #ifdef INET
1366 case AF_INET:
1367 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
1368 carp_master_down, sc);
1369 break;
1370 #endif /* INET */
1371 #ifdef INET6
1372 case AF_INET6:
1373 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
1374 carp_master_down, sc);
1375 break;
1376 #endif /* INET6 */
1377 default:
1378 if (sc->sc_naddrs)
1379 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
1380 carp_master_down, sc);
1381 if (sc->sc_naddrs6)
1382 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
1383 carp_master_down, sc);
1384 break;
1385 }
1386 break;
1387 case MASTER:
1388 tv.tv_sec = sc->sc_advbase;
1389 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1390 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1391 carp_send_ad, sc);
1392 break;
1393 }
1394 }
1395
1396 static void
1397 carp_multicast_cleanup(struct carp_softc *sc)
1398 {
1399 struct ip_moptions *imo = &sc->sc_imo;
1400 uint16_t n = imo->imo_num_memberships;
1401
1402 /* Clean up our own multicast memberships */
1403 while (n-- > 0) {
1404 if (imo->imo_membership[n] != NULL) {
1405 in_delmulti(imo->imo_membership[n]);
1406 imo->imo_membership[n] = NULL;
1407 }
1408 }
1409 imo->imo_num_memberships = 0;
1410 imo->imo_multicast_ifp = NULL;
1411 }
1412
1413 #ifdef INET6
1414 static void
1415 carp_multicast6_cleanup(struct carp_softc *sc)
1416 {
1417 struct ip6_moptions *im6o = &sc->sc_im6o;
1418
1419 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1420 struct in6_multi_mship *imm =
1421 LIST_FIRST(&im6o->im6o_memberships);
1422
1423 LIST_REMOVE(imm, i6mm_chain);
1424 in6_leavegroup(imm);
1425 }
1426 im6o->im6o_multicast_ifp = NULL;
1427 }
1428 #endif
1429
1430 static int
1431 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1432 {
1433 struct ifnet *ifp;
1434 struct carp_if *cif;
1435 struct in_ifaddr *ia, *ia_if;
1436 struct in_ifaddr_container *iac;
1437 struct ip_moptions *imo = &sc->sc_imo;
1438 struct in_addr addr;
1439 u_long iaddr = htonl(sin->sin_addr.s_addr);
1440 int own, error;
1441
1442 if (sin->sin_addr.s_addr == 0)
1443 {
1444 if (!(SC2IFP(sc)->if_flags & IFF_UP))
1445 {
1446 carp_set_state(sc, INIT);
1447 }
1448 if (sc->sc_naddrs)
1449 {
1450 SC2IFP(sc)->if_flags |= IFF_UP;
1451 }
1452 carp_setrun(sc, 0);
1453 return (0);
1454 }
1455 /* we have to do it by hands to check we won't match on us */
1456 ia_if = NULL; own = 0;
1457 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1458 ia = iac->ia;
1459
1460 /* and, yeah, we need a multicast-capable iface too */
1461 if (ia->ia_ifp != SC2IFP(sc) &&
1462 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1463 (iaddr & ia->ia_subnetmask) == ia->ia_subnet) {
1464 if (!ia_if)
1465 ia_if = ia;
1466 if (sin->sin_addr.s_addr ==
1467 ia->ia_addr.sin_addr.s_addr)
1468 own++;
1469 }
1470 }
1471
1472
1473 if (!ia_if)
1474 return (EADDRNOTAVAIL);
1475
1476 ia = ia_if;
1477 ifp = ia->ia_ifp;
1478
1479 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1480 (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp))
1481 return (EADDRNOTAVAIL);
1482
1483 if (imo->imo_num_memberships == 0) {
1484 addr.s_addr = htonl(INADDR_CARP_GROUP);
1485 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL)
1486 return (ENOBUFS);
1487 imo->imo_num_memberships++;
1488 imo->imo_multicast_ifp = ifp;
1489 imo->imo_multicast_ttl = CARP_DFLTTL;
1490 imo->imo_multicast_loop = 0;
1491 }
1492
1493 if (!ifp->if_carp) {
1494
1495 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP,
1496 M_WAITOK|M_ZERO);
1497 if ((error = ifpromisc(ifp, 1))) {
1498 FREE(cif, M_CARP);
1499 goto cleanup;
1500 }
1501
1502 CARP_LOCK_INIT(cif);
1503 CARP_LOCK(cif);
1504 cif->vhif_ifp = ifp;
1505 TAILQ_INIT(&cif->vhif_vrs);
1506 ifp->if_carp = cif;
1507
1508 } else {
1509 struct carp_softc *vr;
1510
1511 cif = (struct carp_if *)ifp->if_carp;
1512 CARP_LOCK(cif);
1513 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1514 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1515 CARP_UNLOCK(cif);
1516 error = EINVAL;
1517 goto cleanup;
1518 }
1519 }
1520 sc->sc_ia = ia;
1521 sc->sc_carpdev = ifp;
1522
1523 { /* XXX prevent endless loop if already in queue */
1524 struct carp_softc *vr, *after = NULL;
1525 int myself = 0;
1526 cif = (struct carp_if *)ifp->if_carp;
1527
1528 /* XXX: cif should not change, right? So we still hold the lock */
1529 CARP_LOCK_ASSERT(cif);
1530
1531 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1532 if (vr == sc)
1533 myself = 1;
1534 if (vr->sc_vhid < sc->sc_vhid)
1535 after = vr;
1536 }
1537
1538 if (!myself) {
1539 /* We're trying to keep things in order */
1540 if (after == NULL) {
1541 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1542 } else {
1543 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1544 }
1545 cif->vhif_nvrs++;
1546 }
1547 }
1548
1549 sc->sc_naddrs++;
1550 SC2IFP(sc)->if_flags |= IFF_UP;
1551 if (own)
1552 sc->sc_advskew = 0;
1553
1554
1555 carp_sc_state_locked(sc);
1556 carp_setrun(sc, 0);
1557
1558 CARP_UNLOCK(cif);
1559
1560 return (0);
1561
1562 cleanup:
1563 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1564 return (error);
1565
1566 }
1567
1568 static int
1569 carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1570 {
1571 int error = 0;
1572
1573 if (!--sc->sc_naddrs) {
1574 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1575 struct ip_moptions *imo = &sc->sc_imo;
1576
1577 CARP_LOCK(cif);
1578 callout_stop(&sc->sc_ad_tmo);
1579 SC2IFP(sc)->if_flags &= ~IFF_UP;
1580 SC2IFP(sc)->if_flags &= ~IFF_RUNNING;
1581 sc->sc_vhid = -1;
1582 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1583 imo->imo_multicast_ifp = NULL;
1584 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1585 if (!--cif->vhif_nvrs) {
1586 sc->sc_carpdev->if_carp = NULL;
1587 CARP_LOCK_DESTROY(cif);
1588 FREE(cif, M_IFADDR);
1589 } else {
1590 CARP_UNLOCK(cif);
1591 }
1592 }
1593
1594 return (error);
1595 }
1596
1597 #ifdef INET6
1598 static int
1599 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1600 {
1601 struct ifnet *ifp;
1602 struct carp_if *cif;
1603 struct in6_ifaddr *ia, *ia_if;
1604 struct ip6_moptions *im6o = &sc->sc_im6o;
1605 struct in6_multi_mship *imm;
1606 struct in6_addr in6;
1607 int own, error;
1608
1609 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1610 if (!(SC2IFP(sc)->if_flags & IFF_UP))
1611 carp_set_state(sc, INIT);
1612 if (sc->sc_naddrs6)
1613 SC2IFP(sc)->if_flags |= IFF_UP;
1614 carp_setrun(sc, 0);
1615 return (0);
1616 }
1617
1618 /* we have to do it by hands to check we won't match on us */
1619 ia_if = NULL; own = 0;
1620 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1621 int i;
1622
1623 for (i = 0; i < 4; i++) {
1624 if ((sin6->sin6_addr.s6_addr32[i] &
1625 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
1626 (ia->ia_addr.sin6_addr.s6_addr32[i] &
1627 ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
1628 break;
1629 }
1630 /* and, yeah, we need a multicast-capable iface too */
1631 if (ia->ia_ifp != SC2IFP(sc) &&
1632 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1633 (i == 4)) {
1634 if (!ia_if)
1635 ia_if = ia;
1636 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
1637 &ia->ia_addr.sin6_addr))
1638 own++;
1639 }
1640 }
1641
1642 if (!ia_if)
1643 return (EADDRNOTAVAIL);
1644 ia = ia_if;
1645 ifp = ia->ia_ifp;
1646
1647 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1648 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp))
1649 return (EADDRNOTAVAIL);
1650
1651 if (!sc->sc_naddrs6) {
1652 im6o->im6o_multicast_ifp = ifp;
1653
1654 /* join CARP multicast address */
1655 bzero(&in6, sizeof(in6));
1656 in6.s6_addr16[0] = htons(0xff02);
1657 in6.s6_addr8[15] = 0x12;
1658 if (in6_setscope(&in6, ifp, NULL) != 0)
1659 goto cleanup;
1660 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
1661 goto cleanup;
1662 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1663
1664 /* join solicited multicast address */
1665 bzero(&in6, sizeof(in6));
1666 in6.s6_addr16[0] = htons(0xff02);
1667 in6.s6_addr32[1] = 0;
1668 in6.s6_addr32[2] = htonl(1);
1669 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3];
1670 in6.s6_addr8[12] = 0xff;
1671 if (in6_setscope(&in6, ifp, NULL) != 0)
1672 goto cleanup;
1673 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
1674 goto cleanup;
1675 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1676 }
1677
1678 if (!ifp->if_carp) {
1679 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP,
1680 M_WAITOK|M_ZERO);
1681 if ((error = ifpromisc(ifp, 1))) {
1682 FREE(cif, M_CARP);
1683 goto cleanup;
1684 }
1685
1686 CARP_LOCK_INIT(cif);
1687 CARP_LOCK(cif);
1688 cif->vhif_ifp = ifp;
1689 TAILQ_INIT(&cif->vhif_vrs);
1690 ifp->if_carp = cif;
1691
1692 } else {
1693 struct carp_softc *vr;
1694
1695 cif = (struct carp_if *)ifp->if_carp;
1696 CARP_LOCK(cif);
1697 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1698 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1699 CARP_UNLOCK(cif);
1700 error = EINVAL;
1701 goto cleanup;
1702 }
1703 }
1704 sc->sc_ia6 = ia;
1705 sc->sc_carpdev = ifp;
1706
1707 { /* XXX prevent endless loop if already in queue */
1708 struct carp_softc *vr, *after = NULL;
1709 int myself = 0;
1710 cif = (struct carp_if *)ifp->if_carp;
1711 CARP_LOCK_ASSERT(cif);
1712
1713 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1714 if (vr == sc)
1715 myself = 1;
1716 if (vr->sc_vhid < sc->sc_vhid)
1717 after = vr;
1718 }
1719
1720 if (!myself) {
1721 /* We're trying to keep things in order */
1722 if (after == NULL) {
1723 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1724 } else {
1725 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1726 }
1727 cif->vhif_nvrs++;
1728 }
1729 }
1730
1731 sc->sc_naddrs6++;
1732 SC2IFP(sc)->if_flags |= IFF_UP;
1733 if (own)
1734 sc->sc_advskew = 0;
1735 carp_sc_state_locked(sc);
1736 carp_setrun(sc, 0);
1737
1738 CARP_UNLOCK(cif);
1739
1740 return (0);
1741
1742 cleanup:
1743 /* clean up multicast memberships */
1744 if (!sc->sc_naddrs6) {
1745 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1746 imm = LIST_FIRST(&im6o->im6o_memberships);
1747 LIST_REMOVE(imm, i6mm_chain);
1748 in6_leavegroup(imm);
1749 }
1750 }
1751 return (error);
1752 }
1753
1754 static int
1755 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1756 {
1757 int error = 0;
1758
1759 if (!--sc->sc_naddrs6) {
1760 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1761 struct ip6_moptions *im6o = &sc->sc_im6o;
1762
1763 CARP_LOCK(cif);
1764 callout_stop(&sc->sc_ad_tmo);
1765 SC2IFP(sc)->if_flags &= ~IFF_UP;
1766 SC2IFP(sc)->if_flags &= ~IFF_RUNNING;
1767 sc->sc_vhid = -1;
1768 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1769 struct in6_multi_mship *imm =
1770 LIST_FIRST(&im6o->im6o_memberships);
1771
1772 LIST_REMOVE(imm, i6mm_chain);
1773 in6_leavegroup(imm);
1774 }
1775 im6o->im6o_multicast_ifp = NULL;
1776 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1777 if (!--cif->vhif_nvrs) {
1778 CARP_LOCK_DESTROY(cif);
1779 sc->sc_carpdev->if_carp = NULL;
1780 FREE(cif, M_IFADDR);
1781 } else
1782 CARP_UNLOCK(cif);
1783 }
1784
1785 return (error);
1786 }
1787 #endif /* INET6 */
1788
1789 static int
1790 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr, struct ucred *creds)
1791 {
1792 struct carp_softc *sc = ifp->if_softc, *vr;
1793 struct carpreq carpr;
1794 struct ifaddr *ifa;
1795 struct ifreq *ifr;
1796 struct ifaliasreq *ifra;
1797 int locked = 0, error = 0;
1798
1799 ifa = (struct ifaddr *)addr;
1800 ifra = (struct ifaliasreq *)addr;
1801 ifr = (struct ifreq *)addr;
1802
1803
1804 switch (cmd) {
1805 case SIOCSIFADDR:
1806 switch (ifa->ifa_addr->sa_family) {
1807 #ifdef INET
1808 case AF_INET:
1809 SC2IFP(sc)->if_flags |= IFF_UP;
1810 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1811 sizeof(struct sockaddr));
1812 error = carp_set_addr(sc, satosin(ifa->ifa_addr));
1813 break;
1814 #endif /* INET */
1815 #ifdef INET6
1816 case AF_INET6:
1817 SC2IFP(sc)->if_flags |= IFF_UP;
1818 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr));
1819 break;
1820 #endif /* INET6 */
1821 default:
1822 error = EAFNOSUPPORT;
1823 break;
1824 }
1825 break;
1826
1827 case SIOCAIFADDR:
1828 switch (ifa->ifa_addr->sa_family) {
1829 #ifdef INET
1830 case AF_INET:
1831 SC2IFP(sc)->if_flags |= IFF_UP;
1832 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1833 sizeof(struct sockaddr));
1834 error = carp_set_addr(sc, satosin(&ifra->ifra_addr));
1835 break;
1836 #endif /* INET */
1837 #ifdef INET6
1838 case AF_INET6:
1839 SC2IFP(sc)->if_flags |= IFF_UP;
1840 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr));
1841 break;
1842 #endif /* INET6 */
1843 default:
1844 error = EAFNOSUPPORT;
1845 break;
1846 }
1847 break;
1848
1849 case SIOCDIFADDR:
1850 switch (ifa->ifa_addr->sa_family) {
1851 #ifdef INET
1852 case AF_INET:
1853 error = carp_del_addr(sc, satosin(&ifra->ifra_addr));
1854 break;
1855 #endif /* INET */
1856 #ifdef INET6
1857 case AF_INET6:
1858 error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr));
1859 break;
1860 #endif /* INET6 */
1861 default:
1862 error = EAFNOSUPPORT;
1863 break;
1864 }
1865 break;
1866
1867 case SIOCSIFFLAGS:
1868 if (sc->sc_carpdev) {
1869 locked = 1;
1870 CARP_SCLOCK(sc);
1871 }
1872 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) {
1873 callout_stop(&sc->sc_ad_tmo);
1874 callout_stop(&sc->sc_md_tmo);
1875 callout_stop(&sc->sc_md6_tmo);
1876 if (sc->sc_state == MASTER)
1877 carp_send_ad_locked(sc);
1878 carp_set_state(sc, INIT);
1879 carp_setrun(sc, 0);
1880 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) {
1881 SC2IFP(sc)->if_flags |= IFF_UP;
1882 carp_setrun(sc, 0);
1883 }
1884 break;
1885
1886 case SIOCSVH:
1887 error = suser(curthread);
1888 if (error)
1889 break;
1890 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr)))
1891 break;
1892 error = 1;
1893 if (sc->sc_carpdev) {
1894 locked = 1;
1895 CARP_SCLOCK(sc);
1896 }
1897 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) {
1898 switch (carpr.carpr_state) {
1899 case BACKUP:
1900 callout_stop(&sc->sc_ad_tmo);
1901 carp_set_state(sc, BACKUP);
1902 carp_setrun(sc, 0);
1903 carp_setroute(sc, RTM_DELETE);
1904 break;
1905 case MASTER:
1906 carp_master_down_locked(sc);
1907 break;
1908 default:
1909 break;
1910 }
1911 }
1912 if (carpr.carpr_vhid > 0) {
1913 if (carpr.carpr_vhid > 255) {
1914 error = EINVAL;
1915 break;
1916 }
1917 if (sc->sc_carpdev) {
1918 struct carp_if *cif;
1919 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1920 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1921 if (vr != sc &&
1922 vr->sc_vhid == carpr.carpr_vhid)
1923 return EEXIST;
1924 }
1925 sc->sc_vhid = carpr.carpr_vhid;
1926 IF_LLADDR(sc->sc_ifp)[0] = 0;
1927 IF_LLADDR(sc->sc_ifp)[1] = 0;
1928 IF_LLADDR(sc->sc_ifp)[2] = 0x5e;
1929 IF_LLADDR(sc->sc_ifp)[3] = 0;
1930 IF_LLADDR(sc->sc_ifp)[4] = 1;
1931 IF_LLADDR(sc->sc_ifp)[5] = sc->sc_vhid;
1932 error--;
1933 }
1934 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) {
1935 if (carpr.carpr_advskew >= 255) {
1936 error = EINVAL;
1937 break;
1938 }
1939 if (carpr.carpr_advbase > 255) {
1940 error = EINVAL;
1941 break;
1942 }
1943 sc->sc_advbase = carpr.carpr_advbase;
1944 sc->sc_advskew = carpr.carpr_advskew;
1945 error--;
1946 }
1947 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key));
1948 if (error > 0)
1949 error = EINVAL;
1950 else {
1951 error = 0;
1952 carp_setrun(sc, 0);
1953 }
1954 break;
1955
1956 case SIOCGVH:
1957 /* XXX: lockless read */
1958 bzero(&carpr, sizeof(carpr));
1959 carpr.carpr_state = sc->sc_state;
1960 carpr.carpr_vhid = sc->sc_vhid;
1961 carpr.carpr_advbase = sc->sc_advbase;
1962 carpr.carpr_advskew = sc->sc_advskew;
1963 error = suser(curthread);
1964 if (error == 0)
1965 bcopy(sc->sc_key, carpr.carpr_key,
1966 sizeof(carpr.carpr_key));
1967 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
1968 break;
1969
1970 default:
1971 error = EINVAL;
1972 }
1973
1974 if (locked)
1975 CARP_SCUNLOCK(sc);
1976
1977 carp_hmac_prepare(sc);
1978
1979 return (error);
1980 }
1981
1982 /*
1983 * XXX: this is looutput. We should eventually use it from there.
1984 */
1985 static int
1986 carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
1987 struct rtentry *rt)
1988 {
1989 uint32_t af;
1990
1991 M_ASSERTPKTHDR(m); /* check if we have the packet header */
1992
1993 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
1994 m_freem(m);
1995 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
1996 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
1997 }
1998
1999 ifp->if_opackets++;
2000 ifp->if_obytes += m->m_pkthdr.len;
2001
2002 /* BPF writes need to be handled specially. */
2003 if (dst->sa_family == AF_UNSPEC) {
2004 bcopy(dst->sa_data, &af, sizeof(af));
2005 dst->sa_family = af;
2006 }
2007
2008 #if 1 /* XXX */
2009 switch (dst->sa_family) {
2010 case AF_INET:
2011 case AF_INET6:
2012 case AF_IPX:
2013 case AF_APPLETALK:
2014 break;
2015 default:
2016 m_freem(m);
2017 return (EAFNOSUPPORT);
2018 }
2019 #endif
2020 return(if_simloop(ifp, m, dst->sa_family, 0));
2021 }
2022
2023 /*
2024 * Start output on carp interface. This function should never be called.
2025 */
2026 static void
2027 carp_start(struct ifnet *ifp)
2028 {
2029 #ifdef DEBUG
2030 kprintf("%s: start called\n", ifp->if_xname);
2031 #endif
2032 }
2033
2034 int
2035 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
2036 struct rtentry *rt)
2037 {
2038 struct m_tag *mtag;
2039 struct carp_softc *sc;
2040 struct ifnet *carp_ifp;
2041
2042 if (!sa)
2043 return (0);
2044
2045 switch (sa->sa_family) {
2046 #ifdef INET
2047 case AF_INET:
2048 break;
2049 #endif /* INET */
2050 #ifdef INET6
2051 case AF_INET6:
2052 break;
2053 #endif /* INET6 */
2054 default:
2055 return (0);
2056 }
2057
2058 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL);
2059 if (mtag == NULL)
2060 return (0);
2061
2062 bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *));
2063 sc = carp_ifp->if_softc;
2064
2065 /* Set the source MAC address to Virtual Router MAC Address */
2066 switch (ifp->if_type) {
2067 case IFT_ETHER:
2068 case IFT_L2VLAN: {
2069 struct ether_header *eh;
2070
2071 eh = mtod(m, struct ether_header *);
2072 eh->ether_shost[0] = 0;
2073 eh->ether_shost[1] = 0;
2074 eh->ether_shost[2] = 0x5e;
2075 eh->ether_shost[3] = 0;
2076 eh->ether_shost[4] = 1;
2077 eh->ether_shost[5] = sc->sc_vhid;
2078 }
2079 break;
2080 default:
2081 kprintf("%s: carp is not supported for this interface type\n",
2082 ifp->if_xname);
2083 return (EOPNOTSUPP);
2084 }
2085
2086 return (0);
2087
2088 }
2089
2090 static void
2091 carp_set_state(struct carp_softc *sc, int state)
2092 {
2093
2094 if (sc->sc_carpdev)
2095 CARP_SCLOCK_ASSERT(sc);
2096
2097 if (sc->sc_state == state)
2098 return;
2099
2100 sc->sc_state = state;
2101 switch (state) {
2102 case BACKUP:
2103 SC2IFP(sc)->if_link_state = LINK_STATE_DOWN;
2104 break;
2105 case MASTER:
2106 SC2IFP(sc)->if_link_state = LINK_STATE_UP;
2107 break;
2108 default:
2109 SC2IFP(sc)->if_link_state = LINK_STATE_UNKNOWN;
2110 break;
2111 }
2112 rt_ifmsg(SC2IFP(sc));
2113 }
2114
2115 void
2116 carp_carpdev_state(void *v)
2117 {
2118 struct carp_if *cif = v;
2119
2120 CARP_LOCK(cif);
2121 carp_carpdev_state_locked(cif);
2122 CARP_UNLOCK(cif);
2123 }
2124
2125 static void
2126 carp_carpdev_state_locked(struct carp_if *cif)
2127 {
2128 struct carp_softc *sc;
2129
2130 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
2131 carp_sc_state_locked(sc);
2132 }
2133
2134 static void
2135 carp_sc_state_locked(struct carp_softc *sc)
2136 {
2137 CARP_SCLOCK_ASSERT(sc);
2138
2139 if ( !(sc->sc_carpdev->if_flags & IFF_UP)) {
2140 sc->sc_flags_backup = SC2IFP(sc)->if_flags;
2141 SC2IFP(sc)->if_flags &= ~IFF_UP;
2142 SC2IFP(sc)->if_flags &= ~IFF_RUNNING;
2143 callout_stop(&sc->sc_ad_tmo);
2144 callout_stop(&sc->sc_md_tmo);
2145 callout_stop(&sc->sc_md6_tmo);
2146 carp_set_state(sc, INIT);
2147 carp_setrun(sc, 0);
2148 if (!sc->sc_suppress) {
2149 carp_suppress_preempt++;
2150 if (carp_suppress_preempt == 1) {
2151 CARP_SCUNLOCK(sc);
2152 carp_send_ad_all();
2153 CARP_SCLOCK(sc);
2154 }
2155 }
2156 sc->sc_suppress = 1;
2157 } else {
2158 SC2IFP(sc)->if_flags |= sc->sc_flags_backup;
2159 carp_set_state(sc, INIT);
2160 carp_setrun(sc, 0);
2161 if (sc->sc_suppress)
2162 carp_suppress_preempt--;
2163 sc->sc_suppress = 0;
2164 }
2165
2166 return;
2167 }
2168
2169 static int
2170 carp_modevent(module_t mod, int type, void *data)
2171 {
2172 switch (type) {
2173 case MOD_LOAD:
2174 LIST_INIT(&carpif_list);
2175 carp_ifdetach_event =
2176 EVENTHANDLER_REGISTER(ifnet_detach_event, carp_ifdetach, NULL,
2177 EVENTHANDLER_PRI_ANY);
2178 if_clone_attach(&carp_cloner);
2179 break;
2180
2181 case MOD_UNLOAD:
2182 EVENTHANDLER_DEREGISTER(ifnet_detach_event,
2183 carp_ifdetach_event);
2184 if_clone_detach(&carp_cloner);
2185 break;
2186
2187 default:
2188 return (EINVAL);
2189 }
2190
2191 return (0);
2192 }
2193
2194 static moduledata_t carp_mod = {
2195 "carp",
2196 carp_modevent,
2197 0
2198 };
2199 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
DragonFly BSD