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Fix kernel build without INET6.
[dragonfly.git] / sys / netinet / ip_carp.c
blob990eae6bf81a4a6177531489dc974964bf45153c
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/malloc.h>
41 #include <sys/mbuf.h>
42 #include <sys/time.h>
43 #include <sys/proc.h>
44 #include <sys/priv.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 #define CARP_IS_RUNNING(ifp) \
82 (((ifp)->if_flags & (IFF_UP | IFF_RUNNING)) == (IFF_UP | IFF_RUNNING))
83
84 struct carp_vhaddr {
85 uint32_t vha_flags; /* CARP_VHAF_ */
86 const struct in_ifaddr *vha_ia; /* carp address */
87 const struct in_ifaddr *vha_iaback; /* backing address */
88 TAILQ_ENTRY(carp_vhaddr) vha_link;
89 };
90 TAILQ_HEAD(carp_vhaddr_list, carp_vhaddr);
91
92 struct carp_softc {
93 struct ifnet sc_if;
94 struct ifnet *sc_carpdev; /* parent interface */
95 struct carp_vhaddr_list sc_vha_list; /* virtual addr list */
96
97 const struct in_ifaddr *sc_ia; /* primary iface address v4 */
98 struct ip_moptions sc_imo;
99
100 #ifdef INET6
101 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */
102 struct ip6_moptions sc_im6o;
103 #endif /* INET6 */
104 TAILQ_ENTRY(carp_softc) sc_list;
105
106 enum { INIT = 0, BACKUP, MASTER }
107 sc_state;
108 int sc_dead;
109
110 int sc_suppress;
111
112 int sc_sendad_errors;
113 #define CARP_SENDAD_MAX_ERRORS 3
114 int sc_sendad_success;
115 #define CARP_SENDAD_MIN_SUCCESS 3
116
117 int sc_vhid;
118 int sc_advskew;
119 int sc_naddrs; /* actually used IPv4 vha */
120 int sc_naddrs6;
121 int sc_advbase; /* seconds */
122 int sc_init_counter;
123 uint64_t sc_counter;
124
125 /* authentication */
126 #define CARP_HMAC_PAD 64
127 unsigned char sc_key[CARP_KEY_LEN];
128 unsigned char sc_pad[CARP_HMAC_PAD];
129 SHA1_CTX sc_sha1;
130
131 struct callout sc_ad_tmo; /* advertisement timeout */
132 struct callout sc_md_tmo; /* master down timeout */
133 struct callout sc_md6_tmo; /* master down timeout */
134
135 LIST_ENTRY(carp_softc) sc_next; /* Interface clue */
136 };
137
138 struct carp_if {
139 TAILQ_HEAD(, carp_softc) vhif_vrs;
140 };
141
142 enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING };
143
144 SYSCTL_DECL(_net_inet_carp);
145
146 static int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */
147 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW,
148 &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets");
149 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW,
150 &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode");
151 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW,
152 &carp_opts[CARPCTL_LOG], 0, "log bad carp packets");
153 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW,
154 &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses");
155
156 static int carp_suppress_preempt = 0;
157 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD,
158 &carp_suppress_preempt, 0, "Preemption is suppressed");
159
160 static struct carpstats carpstats;
161 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW,
162 &carpstats, carpstats,
163 "CARP statistics (struct carpstats, netinet/ip_carp.h)");
164
165 #define CARP_LOG(...) do { \
166 if (carp_opts[CARPCTL_LOG] > 0) \
167 log(LOG_INFO, __VA_ARGS__); \
168 } while (0)
169
170 #define CARP_DEBUG(...) do { \
171 if (carp_opts[CARPCTL_LOG] > 1) \
172 log(LOG_DEBUG, __VA_ARGS__); \
173 } while (0)
174
175 static void carp_hmac_prepare(struct carp_softc *);
176 static void carp_hmac_generate(struct carp_softc *, uint32_t *,
177 unsigned char *);
178 static int carp_hmac_verify(struct carp_softc *, uint32_t *,
179 unsigned char *);
180 static void carp_setroute(struct carp_softc *, int);
181 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t);
182 static int carp_clone_create(struct if_clone *, int);
183 static void carp_clone_destroy(struct ifnet *);
184 static void carp_detach(struct carp_softc *, int);
185 static int carp_prepare_ad(struct mbuf *, struct carp_softc *,
186 struct carp_header *);
187 static void carp_send_ad_all(void);
188 static void carp_send_ad_timeout(void *);
189 static void carp_send_ad(struct carp_softc *);
190 static void carp_send_arp(struct carp_softc *);
191 static void carp_master_down_timeout(void *);
192 static void carp_master_down(struct carp_softc *);
193 static int carp_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
194 static int carp_looutput(struct ifnet *, struct mbuf *, struct sockaddr *,
195 struct rtentry *);
196 static void carp_start(struct ifnet *);
197 static void carp_setrun(struct carp_softc *, sa_family_t);
198 static void carp_set_state(struct carp_softc *, int);
199
200 static void carp_multicast_cleanup(struct carp_softc *);
201 static void carp_add_addr(struct carp_softc *, struct ifaddr *);
202 static void carp_del_addr(struct carp_softc *, struct ifaddr *);
203 static void carp_config_addr(struct carp_softc *, struct ifaddr *);
204 static void carp_link_addrs(struct carp_softc *, struct ifnet *,
205 struct ifaddr *);
206 static void carp_unlink_addrs(struct carp_softc *, struct ifnet *,
207 struct ifaddr *);
208
209 static int carp_get_vhaddr(struct carp_softc *, struct ifdrv *);
210 static int carp_config_vhaddr(struct carp_softc *, struct carp_vhaddr *);
211 static int carp_activate_vhaddr(struct carp_softc *, struct carp_vhaddr *,
212 struct ifnet *, const struct in_ifaddr *, int);
213 static void carp_deactivate_vhaddr(struct carp_softc *,
214 struct carp_vhaddr *);
215
216 static void carp_sc_state(struct carp_softc *);
217 #ifdef INET6
218 static void carp_send_na(struct carp_softc *);
219 static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *);
220 static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *);
221 static void carp_multicast6_cleanup(struct carp_softc *);
222 #endif
223 static void carp_stop(struct carp_softc *, int);
224 static void carp_reset(struct carp_softc *, int);
225
226 static void carp_ifaddr(void *, struct ifnet *, enum ifaddr_event,
227 struct ifaddr *);
228 static void carp_ifdetach(void *, struct ifnet *);
229
230 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces");
231
232 static LIST_HEAD(, carp_softc) carpif_list;
233
234 static struct if_clone carp_cloner =
235 IF_CLONE_INITIALIZER(CARP_IFNAME, carp_clone_create, carp_clone_destroy,
236 0, IF_MAXUNIT);
237
238 static eventhandler_tag carp_ifdetach_event;
239 static eventhandler_tag carp_ifaddr_event;
240
241 static __inline void
242 carp_insert_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha_new)
243 {
244 struct carp_vhaddr *vha;
245 u_long new_addr, addr;
246
247 KKASSERT((vha_new->vha_flags & CARP_VHAF_ONLIST) == 0);
248
249 /*
250 * Virtual address list is sorted; smaller one first
251 */
252 new_addr = ntohl(vha_new->vha_ia->ia_addr.sin_addr.s_addr);
253
254 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
255 addr = ntohl(vha->vha_ia->ia_addr.sin_addr.s_addr);
256
257 if (addr > new_addr)
258 break;
259 }
260 if (vha == NULL)
261 TAILQ_INSERT_TAIL(&sc->sc_vha_list, vha_new, vha_link);
262 else
263 TAILQ_INSERT_BEFORE(vha, vha_new, vha_link);
264 vha_new->vha_flags |= CARP_VHAF_ONLIST;
265 }
266
267 static __inline void
268 carp_remove_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha)
269 {
270 KKASSERT(vha->vha_flags & CARP_VHAF_ONLIST);
271 vha->vha_flags &= ~CARP_VHAF_ONLIST;
272 TAILQ_REMOVE(&sc->sc_vha_list, vha, vha_link);
273 }
274
275 static void
276 carp_hmac_prepare(struct carp_softc *sc)
277 {
278 uint8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
279 uint8_t vhid = sc->sc_vhid & 0xff;
280 int i;
281 #ifdef INET6
282 struct ifaddr_container *ifac;
283 struct in6_addr in6;
284 #endif
285 #ifdef INET
286 struct carp_vhaddr *vha;
287 #endif
288
289 /* XXX: possible race here */
290
291 /* compute ipad from key */
292 bzero(sc->sc_pad, sizeof(sc->sc_pad));
293 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
294 for (i = 0; i < sizeof(sc->sc_pad); i++)
295 sc->sc_pad[i] ^= 0x36;
296
297 /* precompute first part of inner hash */
298 SHA1Init(&sc->sc_sha1);
299 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
300 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
301 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
302 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
303 #ifdef INET
304 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
305 SHA1Update(&sc->sc_sha1,
306 (const uint8_t *)&vha->vha_ia->ia_addr.sin_addr,
307 sizeof(struct in_addr));
308 }
309 #endif /* INET */
310 #ifdef INET6
311 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
312 struct ifaddr *ifa = ifac->ifa;
313
314 if (ifa->ifa_addr->sa_family == AF_INET6) {
315 in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
316 in6_clearscope(&in6);
317 SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6));
318 }
319 }
320 #endif /* INET6 */
321
322 /* convert ipad to opad */
323 for (i = 0; i < sizeof(sc->sc_pad); i++)
324 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
325 }
326
327 static void
328 carp_hmac_generate(struct carp_softc *sc, uint32_t counter[2],
329 unsigned char md[20])
330 {
331 SHA1_CTX sha1ctx;
332
333 /* fetch first half of inner hash */
334 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
335
336 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
337 SHA1Final(md, &sha1ctx);
338
339 /* outer hash */
340 SHA1Init(&sha1ctx);
341 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
342 SHA1Update(&sha1ctx, md, 20);
343 SHA1Final(md, &sha1ctx);
344 }
345
346 static int
347 carp_hmac_verify(struct carp_softc *sc, uint32_t counter[2],
348 unsigned char md[20])
349 {
350 unsigned char md2[20];
351
352 carp_hmac_generate(sc, counter, md2);
353 return (bcmp(md, md2, sizeof(md2)));
354 }
355
356 static void
357 carp_setroute(struct carp_softc *sc, int cmd)
358 {
359 #ifdef INET6
360 struct ifaddr_container *ifac;
361
362 crit_enter();
363 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
364 struct ifaddr *ifa = ifac->ifa;
365
366 if (ifa->ifa_addr->sa_family == AF_INET6) {
367 if (cmd == RTM_ADD)
368 in6_ifaddloop(ifa);
369 else
370 in6_ifremloop(ifa);
371 }
372 }
373 crit_exit();
374 #endif /* INET6 */
375 }
376
377 static int
378 carp_clone_create(struct if_clone *ifc, int unit)
379 {
380 struct carp_softc *sc;
381 struct ifnet *ifp;
382
383 sc = kmalloc(sizeof(*sc), M_CARP, M_WAITOK | M_ZERO);
384 ifp = &sc->sc_if;
385
386 sc->sc_suppress = 0;
387 sc->sc_advbase = CARP_DFLTINTV;
388 sc->sc_vhid = -1; /* required setting */
389 sc->sc_advskew = 0;
390 sc->sc_init_counter = 1;
391 sc->sc_naddrs = 0;
392 sc->sc_naddrs6 = 0;
393
394 TAILQ_INIT(&sc->sc_vha_list);
395
396 #ifdef INET6
397 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
398 #endif
399
400 callout_init(&sc->sc_ad_tmo);
401 callout_init(&sc->sc_md_tmo);
402 callout_init(&sc->sc_md6_tmo);
403
404 ifp->if_softc = sc;
405 if_initname(ifp, CARP_IFNAME, unit);
406 ifp->if_mtu = ETHERMTU;
407 ifp->if_flags = IFF_LOOPBACK;
408 ifp->if_ioctl = carp_ioctl;
409 ifp->if_output = carp_looutput;
410 ifp->if_start = carp_start;
411 ifp->if_type = IFT_CARP;
412 ifp->if_snd.ifq_maxlen = ifqmaxlen;
413 ifp->if_hdrlen = 0;
414 if_attach(ifp, NULL);
415 bpfattach(ifp, DLT_NULL, sizeof(u_int));
416
417 crit_enter();
418 LIST_INSERT_HEAD(&carpif_list, sc, sc_next);
419 crit_exit();
420
421 return (0);
422 }
423
424 static void
425 carp_clone_destroy(struct ifnet *ifp)
426 {
427 struct carp_softc *sc = ifp->if_softc;
428
429 sc->sc_dead = 1;
430 carp_detach(sc, 1);
431
432 crit_enter();
433 LIST_REMOVE(sc, sc_next);
434 crit_exit();
435 bpfdetach(ifp);
436 if_detach(ifp);
437
438 KASSERT(sc->sc_naddrs == 0, ("certain inet address is still active\n"));
439 kfree(sc, M_CARP);
440 }
441
442 static void
443 carp_detach(struct carp_softc *sc, int detach)
444 {
445 struct carp_if *cif;
446
447 carp_reset(sc, detach);
448
449 carp_multicast_cleanup(sc);
450 #ifdef INET6
451 carp_multicast6_cleanup(sc);
452 #endif
453
454 if (!sc->sc_dead && detach) {
455 struct carp_vhaddr *vha;
456
457 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
458 carp_deactivate_vhaddr(sc, vha);
459 KKASSERT(sc->sc_naddrs == 0);
460 }
461
462 if (sc->sc_carpdev != NULL) {
463 cif = sc->sc_carpdev->if_carp;
464 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
465 if (TAILQ_EMPTY(&cif->vhif_vrs)) {
466 ifpromisc(sc->sc_carpdev, 0);
467 sc->sc_carpdev->if_carp = NULL;
468 kfree(cif, M_CARP);
469 }
470 sc->sc_carpdev = NULL;
471 sc->sc_ia = NULL;
472 }
473 }
474
475 /* Detach an interface from the carp. */
476 static void
477 carp_ifdetach(void *arg __unused, struct ifnet *ifp)
478 {
479 struct carp_if *cif = ifp->if_carp;
480 struct carp_softc *sc;
481
482 while (ifp->if_carp &&
483 (sc = TAILQ_FIRST(&cif->vhif_vrs)) != NULL)
484 carp_detach(sc, 1);
485 }
486
487 /*
488 * process input packet.
489 * we have rearranged checks order compared to the rfc,
490 * but it seems more efficient this way or not possible otherwise.
491 */
492 void
493 carp_input(struct mbuf *m, ...)
494 {
495 struct ip *ip = mtod(m, struct ip *);
496 struct carp_header *ch;
497 int len, iphlen;
498 __va_list ap;
499
500 __va_start(ap, m);
501 iphlen = __va_arg(ap, int);
502 __va_end(ap);
503
504 carpstats.carps_ipackets++;
505
506 if (!carp_opts[CARPCTL_ALLOW]) {
507 m_freem(m);
508 return;
509 }
510
511 /* Check if received on a valid carp interface */
512 if (m->m_pkthdr.rcvif->if_carp == NULL) {
513 carpstats.carps_badif++;
514 CARP_LOG("carp_input: packet received on non-carp "
515 "interface: %s\n",
516 m->m_pkthdr.rcvif->if_xname);
517 m_freem(m);
518 return;
519 }
520
521 /* Verify that the IP TTL is CARP_DFLTTL. */
522 if (ip->ip_ttl != CARP_DFLTTL) {
523 carpstats.carps_badttl++;
524 CARP_LOG("carp_input: received ttl %d != %d on %s\n",
525 ip->ip_ttl, CARP_DFLTTL,
526 m->m_pkthdr.rcvif->if_xname);
527 m_freem(m);
528 return;
529 }
530
531 /* Minimal CARP packet size */
532 len = iphlen + sizeof(*ch);
533
534 /*
535 * Verify that the received packet length is
536 * not less than the CARP header
537 */
538 if (m->m_pkthdr.len < len) {
539 carpstats.carps_badlen++;
540 CARP_LOG("packet too short %d on %s\n", m->m_pkthdr.len,
541 m->m_pkthdr.rcvif->if_xname);
542 m_freem(m);
543 return;
544 }
545
546 /* Make sure that CARP header is contiguous */
547 if (len > m->m_len) {
548 m = m_pullup(m, len);
549 if (m == NULL) {
550 carpstats.carps_hdrops++;
551 CARP_LOG("carp_input: m_pullup failed\n");
552 return;
553 }
554 ip = mtod(m, struct ip *);
555 }
556 ch = (struct carp_header *)((uint8_t *)ip + iphlen);
557
558 /* Verify the CARP checksum */
559 if (in_cksum_skip(m, len, iphlen)) {
560 carpstats.carps_badsum++;
561 CARP_LOG("carp_input: checksum failed on %s\n",
562 m->m_pkthdr.rcvif->if_xname);
563 m_freem(m);
564 return;
565 }
566 carp_input_c(m, ch, AF_INET);
567 }
568
569 #ifdef INET6
570 int
571 carp6_input(struct mbuf **mp, int *offp, int proto)
572 {
573 struct mbuf *m = *mp;
574 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
575 struct carp_header *ch;
576 u_int len;
577
578 carpstats.carps_ipackets6++;
579
580 if (!carp_opts[CARPCTL_ALLOW]) {
581 m_freem(m);
582 return (IPPROTO_DONE);
583 }
584
585 /* check if received on a valid carp interface */
586 if (m->m_pkthdr.rcvif->if_carp == NULL) {
587 carpstats.carps_badif++;
588 CARP_LOG("carp6_input: packet received on non-carp "
589 "interface: %s\n",
590 m->m_pkthdr.rcvif->if_xname);
591 m_freem(m);
592 return (IPPROTO_DONE);
593 }
594
595 /* verify that the IP TTL is 255 */
596 if (ip6->ip6_hlim != CARP_DFLTTL) {
597 carpstats.carps_badttl++;
598 CARP_LOG("carp6_input: received ttl %d != 255 on %s\n",
599 ip6->ip6_hlim,
600 m->m_pkthdr.rcvif->if_xname);
601 m_freem(m);
602 return (IPPROTO_DONE);
603 }
604
605 /* verify that we have a complete carp packet */
606 len = m->m_len;
607 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
608 if (ch == NULL) {
609 carpstats.carps_badlen++;
610 CARP_LOG("carp6_input: packet size %u too small\n", len);
611 return (IPPROTO_DONE);
612 }
613
614 /* verify the CARP checksum */
615 if (in_cksum_range(m, 0, *offp, sizeof(*ch))) {
616 carpstats.carps_badsum++;
617 CARP_LOG("carp6_input: checksum failed, on %s\n",
618 m->m_pkthdr.rcvif->if_xname);
619 m_freem(m);
620 return (IPPROTO_DONE);
621 }
622
623 carp_input_c(m, ch, AF_INET6);
624 return (IPPROTO_DONE);
625 }
626 #endif /* INET6 */
627
628 static void
629 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af)
630 {
631 struct ifnet *ifp = m->m_pkthdr.rcvif;
632 struct ifnet *cifp;
633 struct carp_softc *sc;
634 uint64_t tmp_counter;
635 struct timeval sc_tv, ch_tv;
636
637 /* verify that the VHID is valid on the receiving interface */
638 TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list)
639 if (sc->sc_vhid == ch->carp_vhid)
640 break;
641
642 if (!sc || !CARP_IS_RUNNING(&sc->sc_if)) {
643 carpstats.carps_badvhid++;
644 m_freem(m);
645 return;
646 }
647 cifp = &sc->sc_if;
648
649 getmicrotime(&cifp->if_lastchange);
650 cifp->if_ipackets++;
651 cifp->if_ibytes += m->m_pkthdr.len;
652
653 if (cifp->if_bpf) {
654 struct ip *ip = mtod(m, struct ip *);
655
656 /* BPF wants net byte order */
657 ip->ip_len = htons(ip->ip_len + (ip->ip_hl << 2));
658 ip->ip_off = htons(ip->ip_off);
659 bpf_mtap(cifp->if_bpf, m);
660 }
661
662 /* verify the CARP version. */
663 if (ch->carp_version != CARP_VERSION) {
664 carpstats.carps_badver++;
665 cifp->if_ierrors++;
666 CARP_LOG("%s; invalid version %d\n", cifp->if_xname,
667 ch->carp_version);
668 m_freem(m);
669 return;
670 }
671
672 /* verify the hash */
673 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
674 carpstats.carps_badauth++;
675 cifp->if_ierrors++;
676 CARP_LOG("%s: incorrect hash\n", cifp->if_xname);
677 m_freem(m);
678 return;
679 }
680
681 tmp_counter = ntohl(ch->carp_counter[0]);
682 tmp_counter = tmp_counter<<32;
683 tmp_counter += ntohl(ch->carp_counter[1]);
684
685 /* XXX Replay protection goes here */
686
687 sc->sc_init_counter = 0;
688 sc->sc_counter = tmp_counter;
689
690 sc_tv.tv_sec = sc->sc_advbase;
691 if (carp_suppress_preempt && sc->sc_advskew < 240)
692 sc_tv.tv_usec = 240 * 1000000 / 256;
693 else
694 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256;
695 ch_tv.tv_sec = ch->carp_advbase;
696 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
697
698 switch (sc->sc_state) {
699 case INIT:
700 break;
701
702 case MASTER:
703 /*
704 * If we receive an advertisement from a master who's going to
705 * be more frequent than us, go into BACKUP state.
706 */
707 if (timevalcmp(&sc_tv, &ch_tv, >) ||
708 timevalcmp(&sc_tv, &ch_tv, ==)) {
709 callout_stop(&sc->sc_ad_tmo);
710 CARP_DEBUG("%s: MASTER -> BACKUP "
711 "(more frequent advertisement received)\n",
712 cifp->if_xname);
713 carp_set_state(sc, BACKUP);
714 carp_setrun(sc, 0);
715 carp_setroute(sc, RTM_DELETE);
716 }
717 break;
718
719 case BACKUP:
720 /*
721 * If we're pre-empting masters who advertise slower than us,
722 * and this one claims to be slower, treat him as down.
723 */
724 if (carp_opts[CARPCTL_PREEMPT] &&
725 timevalcmp(&sc_tv, &ch_tv, <)) {
726 CARP_DEBUG("%s: BACKUP -> MASTER "
727 "(preempting a slower master)\n", cifp->if_xname);
728 carp_master_down(sc);
729 break;
730 }
731
732 /*
733 * If the master is going to advertise at such a low frequency
734 * that he's guaranteed to time out, we'd might as well just
735 * treat him as timed out now.
736 */
737 sc_tv.tv_sec = sc->sc_advbase * 3;
738 if (timevalcmp(&sc_tv, &ch_tv, <)) {
739 CARP_DEBUG("%s: BACKUP -> MASTER (master timed out)\n",
740 cifp->if_xname);
741 carp_master_down(sc);
742 break;
743 }
744
745 /*
746 * Otherwise, we reset the counter and wait for the next
747 * advertisement.
748 */
749 carp_setrun(sc, af);
750 break;
751 }
752 m_freem(m);
753 }
754
755 static int
756 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch)
757 {
758 struct ifnet *cifp = &sc->sc_if;
759 struct m_tag *mtag;
760
761 if (sc->sc_init_counter) {
762 /* this could also be seconds since unix epoch */
763 sc->sc_counter = karc4random();
764 sc->sc_counter = sc->sc_counter << 32;
765 sc->sc_counter += karc4random();
766 } else {
767 sc->sc_counter++;
768 }
769
770 ch->carp_counter[0] = htonl((sc->sc_counter >> 32) & 0xffffffff);
771 ch->carp_counter[1] = htonl(sc->sc_counter & 0xffffffff);
772
773 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
774
775 /* Tag packet for carp_output */
776 mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct ifnet *), MB_DONTWAIT);
777 if (mtag == NULL) {
778 m_freem(m);
779 cifp->if_oerrors++;
780 return ENOMEM;
781 }
782 bcopy(&cifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *));
783 m_tag_prepend(m, mtag);
784
785 return 0;
786 }
787
788 static void
789 carp_send_ad_all(void)
790 {
791 struct carp_softc *sc;
792
793 LIST_FOREACH(sc, &carpif_list, sc_next) {
794 if (sc->sc_carpdev == NULL)
795 continue;
796
797 if (CARP_IS_RUNNING(&sc->sc_if) && sc->sc_state == MASTER)
798 carp_send_ad(sc);
799 }
800 }
801
802 static void
803 carp_send_ad_timeout(void *xsc)
804 {
805 carp_send_ad(xsc);
806 }
807
808 static void
809 carp_send_ad(struct carp_softc *sc)
810 {
811 struct ifnet *cifp = &sc->sc_if;
812 struct carp_header ch;
813 struct timeval tv;
814 struct carp_header *ch_ptr;
815 struct mbuf *m;
816 int len, advbase, advskew;
817
818 if (!CARP_IS_RUNNING(cifp)) {
819 /* Bow out */
820 advbase = 255;
821 advskew = 255;
822 } else {
823 advbase = sc->sc_advbase;
824 if (!carp_suppress_preempt || sc->sc_advskew > 240)
825 advskew = sc->sc_advskew;
826 else
827 advskew = 240;
828 tv.tv_sec = advbase;
829 tv.tv_usec = advskew * 1000000 / 256;
830 }
831
832 ch.carp_version = CARP_VERSION;
833 ch.carp_type = CARP_ADVERTISEMENT;
834 ch.carp_vhid = sc->sc_vhid;
835 ch.carp_advbase = advbase;
836 ch.carp_advskew = advskew;
837 ch.carp_authlen = 7; /* XXX DEFINE */
838 ch.carp_pad1 = 0; /* must be zero */
839 ch.carp_cksum = 0;
840
841 #ifdef INET
842 if (sc->sc_ia != NULL) {
843 struct ip *ip;
844
845 MGETHDR(m, MB_DONTWAIT, MT_HEADER);
846 if (m == NULL) {
847 cifp->if_oerrors++;
848 carpstats.carps_onomem++;
849 /* XXX maybe less ? */
850 if (advbase != 255 || advskew != 255)
851 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
852 carp_send_ad_timeout, sc);
853 return;
854 }
855 len = sizeof(*ip) + sizeof(ch);
856 m->m_pkthdr.len = len;
857 m->m_pkthdr.rcvif = NULL;
858 m->m_len = len;
859 MH_ALIGN(m, m->m_len);
860 m->m_flags |= M_MCAST;
861 ip = mtod(m, struct ip *);
862 ip->ip_v = IPVERSION;
863 ip->ip_hl = sizeof(*ip) >> 2;
864 ip->ip_tos = IPTOS_LOWDELAY;
865 ip->ip_len = len;
866 ip->ip_id = ip_newid();
867 ip->ip_off = IP_DF;
868 ip->ip_ttl = CARP_DFLTTL;
869 ip->ip_p = IPPROTO_CARP;
870 ip->ip_sum = 0;
871 ip->ip_src = sc->sc_ia->ia_addr.sin_addr;
872 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
873
874 ch_ptr = (struct carp_header *)(&ip[1]);
875 bcopy(&ch, ch_ptr, sizeof(ch));
876 if (carp_prepare_ad(m, sc, ch_ptr))
877 return;
878 ch_ptr->carp_cksum = in_cksum_skip(m, len, sizeof(*ip));
879
880 getmicrotime(&cifp->if_lastchange);
881 cifp->if_opackets++;
882 cifp->if_obytes += len;
883 carpstats.carps_opackets++;
884
885 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) {
886 cifp->if_oerrors++;
887 if (sc->sc_sendad_errors < INT_MAX)
888 sc->sc_sendad_errors++;
889 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
890 carp_suppress_preempt++;
891 if (carp_suppress_preempt == 1) {
892 carp_send_ad_all();
893 }
894 }
895 sc->sc_sendad_success = 0;
896 } else {
897 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
898 if (++sc->sc_sendad_success >=
899 CARP_SENDAD_MIN_SUCCESS) {
900 carp_suppress_preempt--;
901 sc->sc_sendad_errors = 0;
902 }
903 } else {
904 sc->sc_sendad_errors = 0;
905 }
906 }
907 }
908 #endif /* INET */
909 #ifdef INET6
910 if (sc->sc_ia6) {
911 struct ip6_hdr *ip6;
912
913 MGETHDR(m, MB_DONTWAIT, MT_HEADER);
914 if (m == NULL) {
915 cifp->if_oerrors++;
916 carpstats.carps_onomem++;
917 /* XXX maybe less ? */
918 if (advbase != 255 || advskew != 255)
919 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
920 carp_send_ad_timeout, sc);
921 return;
922 }
923 len = sizeof(*ip6) + sizeof(ch);
924 m->m_pkthdr.len = len;
925 m->m_pkthdr.rcvif = NULL;
926 m->m_len = len;
927 MH_ALIGN(m, m->m_len);
928 m->m_flags |= M_MCAST;
929 ip6 = mtod(m, struct ip6_hdr *);
930 bzero(ip6, sizeof(*ip6));
931 ip6->ip6_vfc |= IPV6_VERSION;
932 ip6->ip6_hlim = CARP_DFLTTL;
933 ip6->ip6_nxt = IPPROTO_CARP;
934 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src,
935 sizeof(struct in6_addr));
936 /* set the multicast destination */
937
938 ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
939 ip6->ip6_dst.s6_addr8[15] = 0x12;
940 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
941 cifp->if_oerrors++;
942 m_freem(m);
943 CARP_LOG("%s: in6_setscope failed\n", __func__);
944 return;
945 }
946
947 ch_ptr = (struct carp_header *)(&ip6[1]);
948 bcopy(&ch, ch_ptr, sizeof(ch));
949 if (carp_prepare_ad(m, sc, ch_ptr))
950 return;
951 ch_ptr->carp_cksum = in_cksum_skip(m, len, sizeof(*ip6));
952
953 getmicrotime(&cifp->if_lastchange);
954 cifp->if_opackets++;
955 cifp->if_obytes += len;
956 carpstats.carps_opackets6++;
957
958 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) {
959 cifp->if_oerrors++;
960 if (sc->sc_sendad_errors < INT_MAX)
961 sc->sc_sendad_errors++;
962 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
963 carp_suppress_preempt++;
964 if (carp_suppress_preempt == 1) {
965 carp_send_ad_all();
966 }
967 }
968 sc->sc_sendad_success = 0;
969 } else {
970 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
971 if (++sc->sc_sendad_success >=
972 CARP_SENDAD_MIN_SUCCESS) {
973 carp_suppress_preempt--;
974 sc->sc_sendad_errors = 0;
975 }
976 } else {
977 sc->sc_sendad_errors = 0;
978 }
979 }
980 }
981 #endif /* INET6 */
982
983 if (advbase != 255 || advskew != 255)
984 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
985 carp_send_ad_timeout, sc);
986 }
987
988 /*
989 * Broadcast a gratuitous ARP request containing
990 * the virtual router MAC address for each IP address
991 * associated with the virtual router.
992 */
993 static void
994 carp_send_arp(struct carp_softc *sc)
995 {
996 const struct carp_vhaddr *vha;
997
998 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
999 if (vha->vha_iaback == NULL)
1000 continue;
1001
1002 arp_iainit(sc->sc_carpdev, &vha->vha_ia->ia_addr.sin_addr,
1003 IF_LLADDR(&sc->sc_if));
1004 }
1005 }
1006
1007 #ifdef INET6
1008 static void
1009 carp_send_na(struct carp_softc *sc)
1010 {
1011 struct ifaddr_container *ifac;
1012 struct in6_addr *in6;
1013 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1014
1015 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
1016 struct ifaddr *ifa = ifac->ifa;
1017
1018 if (ifa->ifa_addr->sa_family != AF_INET6)
1019 continue;
1020
1021 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
1022 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1023 ND_NA_FLAG_OVERRIDE, 1, NULL);
1024 DELAY(1000); /* XXX */
1025 }
1026 }
1027 #endif /* INET6 */
1028
1029 static __inline const struct carp_vhaddr *
1030 carp_find_addr(const struct carp_softc *sc, const struct in_addr *addr)
1031 {
1032 struct carp_vhaddr *vha;
1033
1034 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1035 if (vha->vha_iaback == NULL)
1036 continue;
1037
1038 if (vha->vha_ia->ia_addr.sin_addr.s_addr == addr->s_addr)
1039 return vha;
1040 }
1041 return NULL;
1042 }
1043
1044 static int
1045 carp_iamatch_balance(const struct carp_if *cif, const struct in_addr *itaddr,
1046 const struct in_addr *isaddr, uint8_t **enaddr)
1047 {
1048 const struct carp_softc *vh;
1049 int index, count = 0;
1050
1051 /*
1052 * XXX proof of concept implementation.
1053 * We use the source ip to decide which virtual host should
1054 * handle the request. If we're master of that virtual host,
1055 * then we respond, otherwise, just drop the arp packet on
1056 * the floor.
1057 */
1058
1059 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1060 if (!CARP_IS_RUNNING(&vh->sc_if))
1061 continue;
1062
1063 if (carp_find_addr(vh, itaddr) != NULL)
1064 count++;
1065 }
1066 if (count == 0)
1067 return 0;
1068
1069 /* this should be a hash, like pf_hash() */
1070 index = ntohl(isaddr->s_addr) % count;
1071 count = 0;
1072
1073 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1074 if (!CARP_IS_RUNNING(&vh->sc_if))
1075 continue;
1076
1077 if (carp_find_addr(vh, itaddr) == NULL)
1078 continue;
1079
1080 if (count == index) {
1081 if (vh->sc_state == MASTER) {
1082 *enaddr = IF_LLADDR(&vh->sc_if);
1083 return 1;
1084 } else {
1085 return 0;
1086 }
1087 }
1088 count++;
1089 }
1090 return 0;
1091 }
1092
1093 int
1094 carp_iamatch(const void *v, const struct in_addr *itaddr,
1095 const struct in_addr *isaddr, uint8_t **enaddr)
1096 {
1097 const struct carp_if *cif = v;
1098 const struct carp_softc *vh;
1099
1100 if (carp_opts[CARPCTL_ARPBALANCE])
1101 return carp_iamatch_balance(cif, itaddr, isaddr, enaddr);
1102
1103 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1104 if (!CARP_IS_RUNNING(&vh->sc_if) || vh->sc_state != MASTER)
1105 continue;
1106
1107 if (carp_find_addr(vh, itaddr) != NULL) {
1108 *enaddr = IF_LLADDR(&vh->sc_if);
1109 return 1;
1110 }
1111 }
1112 return 0;
1113 }
1114
1115 #ifdef INET6
1116 struct ifaddr *
1117 carp_iamatch6(void *v, struct in6_addr *taddr)
1118 {
1119 struct carp_if *cif = v;
1120 struct carp_softc *vh;
1121
1122 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1123 struct ifaddr_container *ifac;
1124
1125 TAILQ_FOREACH(ifac, &vh->sc_if.if_addrheads[mycpuid],
1126 ifa_link) {
1127 struct ifaddr *ifa = ifac->ifa;
1128
1129 if (IN6_ARE_ADDR_EQUAL(taddr,
1130 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1131 CARP_IS_RUNNING(&vh->sc_if) &&
1132 vh->sc_state == MASTER) {
1133 return (ifa);
1134 }
1135 }
1136 }
1137 return (NULL);
1138 }
1139
1140 void *
1141 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr)
1142 {
1143 struct m_tag *mtag;
1144 struct carp_if *cif = v;
1145 struct carp_softc *sc;
1146
1147 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
1148 struct ifaddr_container *ifac;
1149
1150 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid],
1151 ifa_link) {
1152 struct ifaddr *ifa = ifac->ifa;
1153
1154 if (IN6_ARE_ADDR_EQUAL(taddr,
1155 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1156 CARP_IS_RUNNING(&sc->sc_if)) {
1157 struct ifnet *ifp = &sc->sc_if;
1158
1159 mtag = m_tag_get(PACKET_TAG_CARP,
1160 sizeof(struct ifnet *), MB_DONTWAIT);
1161 if (mtag == NULL) {
1162 /* better a bit than nothing */
1163 return (IF_LLADDR(ifp));
1164 }
1165 bcopy(&ifp, (caddr_t)(mtag + 1),
1166 sizeof(struct ifnet *));
1167 m_tag_prepend(m, mtag);
1168
1169 return (IF_LLADDR(ifp));
1170 }
1171 }
1172 }
1173 return (NULL);
1174 }
1175 #endif
1176
1177 int
1178 carp_forus(const void *v, const void *dhost)
1179 {
1180 const struct carp_if *cif = v;
1181 const struct carp_softc *vh;
1182 const uint8_t *ena = dhost;
1183
1184 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
1185 return 0;
1186
1187 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1188 const struct ifnet *cifp = &vh->sc_if;
1189
1190 if (CARP_IS_RUNNING(cifp) && vh->sc_state == MASTER &&
1191 !bcmp(dhost, IF_LLADDR(cifp), ETHER_ADDR_LEN))
1192 return 1;
1193 }
1194 return 0;
1195 }
1196
1197 static void
1198 carp_master_down_timeout(void *xsc)
1199 {
1200 struct carp_softc *sc = xsc;
1201
1202 CARP_DEBUG("%s: BACKUP -> MASTER (master timed out)\n",
1203 sc->sc_if.if_xname);
1204 carp_master_down(sc);
1205 }
1206
1207 static void
1208 carp_master_down(struct carp_softc *sc)
1209 {
1210 switch (sc->sc_state) {
1211 case INIT:
1212 kprintf("%s: master_down event in INIT state\n",
1213 sc->sc_if.if_xname);
1214 break;
1215
1216 case MASTER:
1217 break;
1218
1219 case BACKUP:
1220 carp_set_state(sc, MASTER);
1221 carp_send_ad(sc);
1222 carp_send_arp(sc);
1223 #ifdef INET6
1224 carp_send_na(sc);
1225 #endif /* INET6 */
1226 carp_setrun(sc, 0);
1227 carp_setroute(sc, RTM_ADD);
1228 break;
1229 }
1230 }
1231
1232 /*
1233 * When in backup state, af indicates whether to reset the master down timer
1234 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1235 */
1236 static void
1237 carp_setrun(struct carp_softc *sc, sa_family_t af)
1238 {
1239 struct ifnet *cifp = &sc->sc_if;
1240 struct timeval tv;
1241
1242 if (sc->sc_carpdev == NULL) {
1243 carp_set_state(sc, INIT);
1244 return;
1245 }
1246
1247 if ((cifp->if_flags & IFF_RUNNING) && sc->sc_vhid > 0 &&
1248 (sc->sc_naddrs || sc->sc_naddrs6)) {
1249 /* Nothing */
1250 } else {
1251 carp_setroute(sc, RTM_DELETE);
1252 return;
1253 }
1254
1255 switch (sc->sc_state) {
1256 case INIT:
1257 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) {
1258 carp_send_ad(sc);
1259 carp_send_arp(sc);
1260 #ifdef INET6
1261 carp_send_na(sc);
1262 #endif /* INET6 */
1263 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n",
1264 cifp->if_xname);
1265 carp_set_state(sc, MASTER);
1266 carp_setroute(sc, RTM_ADD);
1267 } else {
1268 CARP_DEBUG("%s: INIT -> BACKUP\n", cifp->if_xname);
1269 carp_set_state(sc, BACKUP);
1270 carp_setroute(sc, RTM_DELETE);
1271 carp_setrun(sc, 0);
1272 }
1273 break;
1274
1275 case BACKUP:
1276 callout_stop(&sc->sc_ad_tmo);
1277 tv.tv_sec = 3 * sc->sc_advbase;
1278 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1279 switch (af) {
1280 #ifdef INET
1281 case AF_INET:
1282 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
1283 carp_master_down_timeout, sc);
1284 break;
1285 #endif /* INET */
1286 #ifdef INET6
1287 case AF_INET6:
1288 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
1289 carp_master_down_timeout, sc);
1290 break;
1291 #endif /* INET6 */
1292 default:
1293 if (sc->sc_naddrs)
1294 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
1295 carp_master_down_timeout, sc);
1296 if (sc->sc_naddrs6)
1297 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
1298 carp_master_down_timeout, sc);
1299 break;
1300 }
1301 break;
1302
1303 case MASTER:
1304 tv.tv_sec = sc->sc_advbase;
1305 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1306 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1307 carp_send_ad_timeout, sc);
1308 break;
1309 }
1310 }
1311
1312 static void
1313 carp_multicast_cleanup(struct carp_softc *sc)
1314 {
1315 struct ip_moptions *imo = &sc->sc_imo;
1316
1317 if (imo->imo_num_memberships == 0)
1318 return;
1319 KKASSERT(imo->imo_num_memberships == 1);
1320
1321 in_delmulti(imo->imo_membership[0]);
1322 imo->imo_membership[0] = NULL;
1323 imo->imo_num_memberships = 0;
1324 imo->imo_multicast_ifp = NULL;
1325 }
1326
1327 #ifdef INET6
1328 static void
1329 carp_multicast6_cleanup(struct carp_softc *sc)
1330 {
1331 struct ip6_moptions *im6o = &sc->sc_im6o;
1332
1333 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1334 struct in6_multi_mship *imm =
1335 LIST_FIRST(&im6o->im6o_memberships);
1336
1337 LIST_REMOVE(imm, i6mm_chain);
1338 in6_leavegroup(imm);
1339 }
1340 im6o->im6o_multicast_ifp = NULL;
1341 }
1342 #endif
1343
1344 static int
1345 carp_get_vhaddr(struct carp_softc *sc, struct ifdrv *ifd)
1346 {
1347 const struct carp_vhaddr *vha;
1348 struct ifcarpvhaddr *carpa, *carpa0;
1349 int count, len, error;
1350
1351 count = 0;
1352 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
1353 ++count;
1354
1355 if (ifd->ifd_len == 0) {
1356 ifd->ifd_len = count * sizeof(*carpa);
1357 return 0;
1358 } else if (count == 0 || ifd->ifd_len < sizeof(*carpa)) {
1359 ifd->ifd_len = 0;
1360 return 0;
1361 }
1362 len = min(ifd->ifd_len, sizeof(*carpa) * count);
1363 KKASSERT(len >= sizeof(*carpa));
1364
1365 carpa0 = carpa = kmalloc(len, M_TEMP, M_WAITOK | M_NULLOK | M_ZERO);
1366 if (carpa == NULL)
1367 return ENOMEM;
1368
1369 count = 0;
1370 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1371 if (len < sizeof(*carpa))
1372 break;
1373
1374 carpa->carpa_flags = vha->vha_flags;
1375 carpa->carpa_addr.sin_family = AF_INET;
1376 carpa->carpa_addr.sin_addr = vha->vha_ia->ia_addr.sin_addr;
1377
1378 carpa->carpa_baddr.sin_family = AF_INET;
1379 if (vha->vha_iaback == NULL) {
1380 carpa->carpa_baddr.sin_addr.s_addr = INADDR_ANY;
1381 } else {
1382 carpa->carpa_baddr.sin_addr =
1383 vha->vha_iaback->ia_addr.sin_addr;
1384 }
1385
1386 ++carpa;
1387 ++count;
1388 len -= sizeof(*carpa);
1389 }
1390 ifd->ifd_len = sizeof(*carpa) * count;
1391 KKASSERT(ifd->ifd_len > 0);
1392
1393 error = copyout(carpa0, ifd->ifd_data, ifd->ifd_len);
1394 kfree(carpa0, M_TEMP);
1395 return error;
1396 }
1397
1398 static int
1399 carp_config_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha)
1400 {
1401 struct ifnet *ifp;
1402 struct in_ifaddr *ia_if;
1403 struct in_ifaddr_container *iac;
1404 const struct sockaddr_in *sin;
1405 u_long iaddr;
1406 int own;
1407
1408 KKASSERT(vha->vha_ia != NULL);
1409
1410 sin = &vha->vha_ia->ia_addr;
1411 iaddr = ntohl(sin->sin_addr.s_addr);
1412
1413 ia_if = NULL;
1414 own = 0;
1415 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1416 struct in_ifaddr *ia = iac->ia;
1417
1418 if ((ia->ia_flags & IFA_ROUTE) == 0)
1419 continue;
1420
1421 if (ia->ia_ifp->if_type == IFT_CARP)
1422 continue;
1423
1424 /* and, yeah, we need a multicast-capable iface too */
1425 if ((ia->ia_ifp->if_flags & IFF_MULTICAST) == 0)
1426 continue;
1427
1428 if ((iaddr & ia->ia_subnetmask) == ia->ia_subnet) {
1429 if (sin->sin_addr.s_addr ==
1430 ia->ia_addr.sin_addr.s_addr)
1431 own = 1;
1432 if (ia_if == NULL)
1433 ia_if = ia;
1434 else if (sc->sc_carpdev != NULL &&
1435 sc->sc_carpdev == ia->ia_ifp)
1436 ia_if = ia;
1437 }
1438 }
1439
1440 carp_deactivate_vhaddr(sc, vha);
1441 if (!ia_if)
1442 return ENOENT;
1443
1444 ifp = ia_if->ia_ifp;
1445
1446 /* XXX Don't allow parent iface to be changed */
1447 if (sc->sc_carpdev != NULL && sc->sc_carpdev != ifp)
1448 return EEXIST;
1449
1450 return carp_activate_vhaddr(sc, vha, ifp, ia_if, own);
1451 }
1452
1453 static void
1454 carp_add_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
1455 {
1456 struct carp_vhaddr *vha_new;
1457 struct in_ifaddr *carp_ia;
1458 #ifdef INVARIANTS
1459 struct carp_vhaddr *vha;
1460 #endif
1461
1462 KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
1463 carp_ia = ifatoia(carp_ifa);
1464
1465 #ifdef INVARIANTS
1466 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
1467 KKASSERT(vha->vha_ia != NULL && vha->vha_ia != carp_ia);
1468 #endif
1469
1470 vha_new = kmalloc(sizeof(*vha_new), M_CARP, M_WAITOK | M_ZERO);
1471 vha_new->vha_ia = carp_ia;
1472 carp_insert_vhaddr(sc, vha_new);
1473
1474 if (carp_config_vhaddr(sc, vha_new) != 0) {
1475 /*
1476 * If the above configuration fails, it may only mean
1477 * that the new address is problematic. However, the
1478 * carp(4) interface may already have several working
1479 * addresses. Since the expected behaviour of
1480 * SIOC[AS]IFADDR is to put the NIC into working state,
1481 * we try starting the state machine manually here with
1482 * the hope that the carp(4)'s previously working
1483 * addresses still could be brought up.
1484 */
1485 carp_hmac_prepare(sc);
1486 carp_set_state(sc, INIT);
1487 carp_setrun(sc, 0);
1488 }
1489 }
1490
1491 static void
1492 carp_del_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
1493 {
1494 struct carp_vhaddr *vha;
1495 struct in_ifaddr *carp_ia;
1496
1497 KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
1498 carp_ia = ifatoia(carp_ifa);
1499
1500 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1501 KKASSERT(vha->vha_ia != NULL);
1502 if (vha->vha_ia == carp_ia)
1503 break;
1504 }
1505 KASSERT(vha != NULL, ("no corresponding vhaddr %p\n", carp_ifa));
1506
1507 /*
1508 * Remove the vhaddr from the list before deactivating
1509 * the vhaddr, so that the HMAC could be correctly
1510 * updated in carp_deactivate_vhaddr()
1511 */
1512 carp_remove_vhaddr(sc, vha);
1513
1514 carp_deactivate_vhaddr(sc, vha);
1515 kfree(vha, M_CARP);
1516 }
1517
1518 static void
1519 carp_config_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
1520 {
1521 struct carp_vhaddr *vha;
1522 struct in_ifaddr *carp_ia;
1523
1524 KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
1525 carp_ia = ifatoia(carp_ifa);
1526
1527 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1528 KKASSERT(vha->vha_ia != NULL);
1529 if (vha->vha_ia == carp_ia)
1530 break;
1531 }
1532 KASSERT(vha != NULL, ("no corresponding vhaddr %p\n", carp_ifa));
1533
1534 /* Remove then reinsert, to keep the vhaddr list sorted */
1535 carp_remove_vhaddr(sc, vha);
1536 carp_insert_vhaddr(sc, vha);
1537
1538 if (carp_config_vhaddr(sc, vha) != 0) {
1539 /* See the comment in carp_add_addr() */
1540 carp_hmac_prepare(sc);
1541 carp_set_state(sc, INIT);
1542 carp_setrun(sc, 0);
1543 }
1544 }
1545
1546 #ifdef INET6
1547 static int
1548 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1549 {
1550 struct ifnet *ifp;
1551 struct carp_if *cif;
1552 struct in6_ifaddr *ia, *ia_if;
1553 struct ip6_moptions *im6o = &sc->sc_im6o;
1554 struct in6_multi_mship *imm;
1555 struct in6_addr in6;
1556 int own, error;
1557
1558 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1559 carp_setrun(sc, 0);
1560 return (0);
1561 }
1562
1563 /* we have to do it by hands to check we won't match on us */
1564 ia_if = NULL; own = 0;
1565 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1566 int i;
1567
1568 for (i = 0; i < 4; i++) {
1569 if ((sin6->sin6_addr.s6_addr32[i] &
1570 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
1571 (ia->ia_addr.sin6_addr.s6_addr32[i] &
1572 ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
1573 break;
1574 }
1575 /* and, yeah, we need a multicast-capable iface too */
1576 if (ia->ia_ifp != &sc->sc_if &&
1577 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1578 (i == 4)) {
1579 if (!ia_if)
1580 ia_if = ia;
1581 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
1582 &ia->ia_addr.sin6_addr))
1583 own++;
1584 }
1585 }
1586
1587 if (!ia_if)
1588 return (EADDRNOTAVAIL);
1589 ia = ia_if;
1590 ifp = ia->ia_ifp;
1591
1592 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1593 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp))
1594 return (EADDRNOTAVAIL);
1595
1596 if (!sc->sc_naddrs6) {
1597 im6o->im6o_multicast_ifp = ifp;
1598
1599 /* join CARP multicast address */
1600 bzero(&in6, sizeof(in6));
1601 in6.s6_addr16[0] = htons(0xff02);
1602 in6.s6_addr8[15] = 0x12;
1603 if (in6_setscope(&in6, ifp, NULL) != 0)
1604 goto cleanup;
1605 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
1606 goto cleanup;
1607 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1608
1609 /* join solicited multicast address */
1610 bzero(&in6, sizeof(in6));
1611 in6.s6_addr16[0] = htons(0xff02);
1612 in6.s6_addr32[1] = 0;
1613 in6.s6_addr32[2] = htonl(1);
1614 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3];
1615 in6.s6_addr8[12] = 0xff;
1616 if (in6_setscope(&in6, ifp, NULL) != 0)
1617 goto cleanup;
1618 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
1619 goto cleanup;
1620 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1621 }
1622
1623 if (!ifp->if_carp) {
1624 cif = kmalloc(sizeof(*cif), M_CARP, M_WAITOK | M_ZERO);
1625
1626 if ((error = ifpromisc(ifp, 1))) {
1627 kfree(cif, M_CARP);
1628 goto cleanup;
1629 }
1630
1631 TAILQ_INIT(&cif->vhif_vrs);
1632 ifp->if_carp = cif;
1633 } else {
1634 struct carp_softc *vr;
1635
1636 cif = ifp->if_carp;
1637 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1638 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1639 error = EINVAL;
1640 goto cleanup;
1641 }
1642 }
1643 }
1644 sc->sc_ia6 = ia;
1645 sc->sc_carpdev = ifp;
1646
1647 { /* XXX prevent endless loop if already in queue */
1648 struct carp_softc *vr, *after = NULL;
1649 int myself = 0;
1650 cif = ifp->if_carp;
1651
1652 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1653 if (vr == sc)
1654 myself = 1;
1655 if (vr->sc_vhid < sc->sc_vhid)
1656 after = vr;
1657 }
1658
1659 if (!myself) {
1660 /* We're trying to keep things in order */
1661 if (after == NULL)
1662 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1663 else
1664 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1665 }
1666 }
1667
1668 sc->sc_naddrs6++;
1669 if (own)
1670 sc->sc_advskew = 0;
1671 carp_sc_state(sc);
1672 carp_setrun(sc, 0);
1673
1674 return (0);
1675
1676 cleanup:
1677 /* clean up multicast memberships */
1678 if (!sc->sc_naddrs6) {
1679 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1680 imm = LIST_FIRST(&im6o->im6o_memberships);
1681 LIST_REMOVE(imm, i6mm_chain);
1682 in6_leavegroup(imm);
1683 }
1684 }
1685 return (error);
1686 }
1687
1688 static int
1689 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1690 {
1691 int error = 0;
1692
1693 if (!--sc->sc_naddrs6) {
1694 struct carp_if *cif = sc->sc_carpdev->if_carp;
1695 struct ip6_moptions *im6o = &sc->sc_im6o;
1696
1697 callout_stop(&sc->sc_ad_tmo);
1698 sc->sc_vhid = -1;
1699 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1700 struct in6_multi_mship *imm =
1701 LIST_FIRST(&im6o->im6o_memberships);
1702
1703 LIST_REMOVE(imm, i6mm_chain);
1704 in6_leavegroup(imm);
1705 }
1706 im6o->im6o_multicast_ifp = NULL;
1707 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1708 if (TAILQ_EMPTY(&cif->vhif_vrs)) {
1709 sc->sc_carpdev->if_carp = NULL;
1710 kfree(cif, M_IFADDR);
1711 }
1712 }
1713 return (error);
1714 }
1715 #endif /* INET6 */
1716
1717 static int
1718 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr, struct ucred *cr)
1719 {
1720 struct carp_softc *sc = ifp->if_softc, *vr;
1721 struct carpreq carpr;
1722 struct ifaddr *ifa;
1723 struct ifreq *ifr;
1724 struct ifaliasreq *ifra;
1725 struct ifdrv *ifd;
1726 char devname[IFNAMSIZ];
1727 int error = 0;
1728
1729 ifa = (struct ifaddr *)addr;
1730 ifra = (struct ifaliasreq *)addr;
1731 ifr = (struct ifreq *)addr;
1732 ifd = (struct ifdrv *)addr;
1733
1734 switch (cmd) {
1735 case SIOCSIFADDR:
1736 switch (ifa->ifa_addr->sa_family) {
1737 #ifdef INET
1738 case AF_INET:
1739 ifp->if_flags |= IFF_UP | IFF_RUNNING;
1740 break;
1741 #endif /* INET */
1742 #ifdef INET6
1743 case AF_INET6:
1744 ifp->if_flags |= IFF_UP | IFF_RUNNING;
1745 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr));
1746 break;
1747 #endif /* INET6 */
1748 default:
1749 error = EAFNOSUPPORT;
1750 break;
1751 }
1752 break;
1753
1754 case SIOCAIFADDR:
1755 switch (ifa->ifa_addr->sa_family) {
1756 #ifdef INET
1757 case AF_INET:
1758 panic("SIOCAIFADDR should never be seen\n");
1759 #endif /* INET */
1760 #ifdef INET6
1761 case AF_INET6:
1762 ifp->if_flags |= IFF_UP | IFF_RUNNING;
1763 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr));
1764 break;
1765 #endif /* INET6 */
1766 default:
1767 error = EAFNOSUPPORT;
1768 break;
1769 }
1770 break;
1771
1772 case SIOCDIFADDR:
1773 switch (ifa->ifa_addr->sa_family) {
1774 #ifdef INET
1775 case AF_INET:
1776 panic("SIOCDIFADDR should never be seen\n");
1777 #endif /* INET */
1778 #ifdef INET6
1779 case AF_INET6:
1780 error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr));
1781 break;
1782 #endif /* INET6 */
1783 default:
1784 error = EAFNOSUPPORT;
1785 break;
1786 }
1787 break;
1788
1789 case SIOCSIFFLAGS:
1790 if (ifp->if_flags & IFF_UP) {
1791 if ((ifp->if_flags & IFF_RUNNING) == 0) {
1792 ifp->if_flags |= IFF_RUNNING;
1793 carp_set_state(sc, INIT);
1794 carp_setrun(sc, 0);
1795 }
1796 } else if (ifp->if_flags & IFF_RUNNING) {
1797 carp_stop(sc, 0);
1798 }
1799 break;
1800
1801 case SIOCSVH:
1802 error = priv_check_cred(cr, PRIV_ROOT, NULL_CRED_OKAY);
1803 if (error)
1804 break;
1805 error = copyin(ifr->ifr_data, &carpr, sizeof(carpr));
1806 if (error)
1807 break;
1808
1809 error = 1;
1810 if ((ifp->if_flags & IFF_RUNNING) &&
1811 sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) {
1812 switch (carpr.carpr_state) {
1813 case BACKUP:
1814 callout_stop(&sc->sc_ad_tmo);
1815 carp_set_state(sc, BACKUP);
1816 carp_setrun(sc, 0);
1817 carp_setroute(sc, RTM_DELETE);
1818 break;
1819
1820 case MASTER:
1821 carp_master_down(sc);
1822 break;
1823
1824 default:
1825 break;
1826 }
1827 }
1828 if (carpr.carpr_vhid > 0) {
1829 if (carpr.carpr_vhid > 255) {
1830 error = EINVAL;
1831 break;
1832 }
1833 if (sc->sc_carpdev) {
1834 struct carp_if *cif = sc->sc_carpdev->if_carp;
1835
1836 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1837 if (vr != sc &&
1838 vr->sc_vhid == carpr.carpr_vhid)
1839 return EEXIST;
1840 }
1841 }
1842 sc->sc_vhid = carpr.carpr_vhid;
1843 IF_LLADDR(ifp)[0] = 0;
1844 IF_LLADDR(ifp)[1] = 0;
1845 IF_LLADDR(ifp)[2] = 0x5e;
1846 IF_LLADDR(ifp)[3] = 0;
1847 IF_LLADDR(ifp)[4] = 1;
1848 IF_LLADDR(ifp)[5] = sc->sc_vhid;
1849 error--;
1850 }
1851 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) {
1852 if (carpr.carpr_advskew >= 255) {
1853 error = EINVAL;
1854 break;
1855 }
1856 if (carpr.carpr_advbase > 255) {
1857 error = EINVAL;
1858 break;
1859 }
1860 sc->sc_advbase = carpr.carpr_advbase;
1861 sc->sc_advskew = carpr.carpr_advskew;
1862 error--;
1863 }
1864 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key));
1865 if (error > 0) {
1866 error = EINVAL;
1867 } else {
1868 error = 0;
1869 carp_setrun(sc, 0);
1870 }
1871 break;
1872
1873 case SIOCGVH:
1874 bzero(&carpr, sizeof(carpr));
1875 carpr.carpr_state = sc->sc_state;
1876 carpr.carpr_vhid = sc->sc_vhid;
1877 carpr.carpr_advbase = sc->sc_advbase;
1878 carpr.carpr_advskew = sc->sc_advskew;
1879 error = priv_check_cred(cr, PRIV_ROOT, NULL_CRED_OKAY);
1880 if (error == 0) {
1881 bcopy(sc->sc_key, carpr.carpr_key,
1882 sizeof(carpr.carpr_key));
1883 }
1884
1885 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
1886 break;
1887
1888 case SIOCGDRVSPEC:
1889 switch (ifd->ifd_cmd) {
1890 case CARPGDEVNAME:
1891 if (ifd->ifd_len != sizeof(devname))
1892 error = EINVAL;
1893 break;
1894
1895 case CARPGVHADDR:
1896 break;
1897
1898 default:
1899 error = EINVAL;
1900 break;
1901 }
1902 if (error)
1903 break;
1904
1905 switch (ifd->ifd_cmd) {
1906 case CARPGVHADDR:
1907 error = carp_get_vhaddr(sc, ifd);
1908 break;
1909
1910 case CARPGDEVNAME:
1911 bzero(devname, sizeof(devname));
1912 if (sc->sc_carpdev != NULL) {
1913 strlcpy(devname, sc->sc_carpdev->if_xname,
1914 sizeof(devname));
1915 }
1916 error = copyout(devname, ifd->ifd_data,
1917 sizeof(devname));
1918 break;
1919 }
1920 break;
1921
1922 default:
1923 error = EINVAL;
1924 break;
1925 }
1926 carp_hmac_prepare(sc);
1927 return error;
1928 }
1929
1930 /*
1931 * XXX: this is looutput. We should eventually use it from there.
1932 */
1933 static int
1934 carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
1935 struct rtentry *rt)
1936 {
1937 uint32_t af;
1938
1939 M_ASSERTPKTHDR(m); /* check if we have the packet header */
1940
1941 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
1942 m_freem(m);
1943 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
1944 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
1945 }
1946
1947 ifp->if_opackets++;
1948 ifp->if_obytes += m->m_pkthdr.len;
1949
1950 /* BPF writes need to be handled specially. */
1951 if (dst->sa_family == AF_UNSPEC) {
1952 bcopy(dst->sa_data, &af, sizeof(af));
1953 dst->sa_family = af;
1954 }
1955
1956 #if 1 /* XXX */
1957 switch (dst->sa_family) {
1958 case AF_INET:
1959 case AF_INET6:
1960 case AF_IPX:
1961 case AF_APPLETALK:
1962 break;
1963
1964 default:
1965 m_freem(m);
1966 return (EAFNOSUPPORT);
1967 }
1968 #endif
1969 return (if_simloop(ifp, m, dst->sa_family, 0));
1970 }
1971
1972 /*
1973 * Start output on carp interface. This function should never be called.
1974 */
1975 static void
1976 carp_start(struct ifnet *ifp)
1977 {
1978 #ifdef DEBUG
1979 kprintf("%s: start called\n", ifp->if_xname);
1980 #endif
1981 }
1982
1983 int
1984 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
1985 struct rtentry *rt)
1986 {
1987 struct m_tag *mtag;
1988 struct carp_softc *sc;
1989 struct ifnet *carp_ifp;
1990 struct ether_header *eh;
1991
1992 if (!sa)
1993 return (0);
1994
1995 switch (sa->sa_family) {
1996 #ifdef INET
1997 case AF_INET:
1998 break;
1999 #endif /* INET */
2000 #ifdef INET6
2001 case AF_INET6:
2002 break;
2003 #endif /* INET6 */
2004 default:
2005 return (0);
2006 }
2007
2008 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL);
2009 if (mtag == NULL)
2010 return (0);
2011
2012 bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *));
2013 sc = carp_ifp->if_softc;
2014
2015 /* Set the source MAC address to Virtual Router MAC Address */
2016 switch (ifp->if_type) {
2017 case IFT_ETHER:
2018 case IFT_L2VLAN:
2019 eh = mtod(m, struct ether_header *);
2020 eh->ether_shost[0] = 0;
2021 eh->ether_shost[1] = 0;
2022 eh->ether_shost[2] = 0x5e;
2023 eh->ether_shost[3] = 0;
2024 eh->ether_shost[4] = 1;
2025 eh->ether_shost[5] = sc->sc_vhid;
2026 break;
2027
2028 default:
2029 if_printf(ifp, "carp is not supported for this "
2030 "interface type\n");
2031 return (EOPNOTSUPP);
2032 }
2033 return (0);
2034 }
2035
2036 static void
2037 carp_set_state(struct carp_softc *sc, int state)
2038 {
2039 struct ifnet *cifp = &sc->sc_if;
2040
2041 if (sc->sc_state == state)
2042 return;
2043 sc->sc_state = state;
2044
2045 switch (sc->sc_state) {
2046 case BACKUP:
2047 cifp->if_link_state = LINK_STATE_DOWN;
2048 break;
2049
2050 case MASTER:
2051 cifp->if_link_state = LINK_STATE_UP;
2052 break;
2053
2054 default:
2055 cifp->if_link_state = LINK_STATE_UNKNOWN;
2056 break;
2057 }
2058 rt_ifmsg(cifp);
2059 }
2060
2061 void
2062 carp_carpdev_state(void *v)
2063 {
2064 struct carp_if *cif = v;
2065 struct carp_softc *sc;
2066
2067 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
2068 carp_sc_state(sc);
2069 }
2070
2071 static void
2072 carp_sc_state(struct carp_softc *sc)
2073 {
2074 if (!(sc->sc_carpdev->if_flags & IFF_UP)) {
2075 callout_stop(&sc->sc_ad_tmo);
2076 callout_stop(&sc->sc_md_tmo);
2077 callout_stop(&sc->sc_md6_tmo);
2078 carp_set_state(sc, INIT);
2079 carp_setrun(sc, 0);
2080 if (!sc->sc_suppress) {
2081 carp_suppress_preempt++;
2082 if (carp_suppress_preempt == 1)
2083 carp_send_ad_all();
2084 }
2085 sc->sc_suppress = 1;
2086 } else {
2087 carp_set_state(sc, INIT);
2088 carp_setrun(sc, 0);
2089 if (sc->sc_suppress)
2090 carp_suppress_preempt--;
2091 sc->sc_suppress = 0;
2092 }
2093 }
2094
2095 static void
2096 carp_stop(struct carp_softc *sc, int detach)
2097 {
2098 sc->sc_if.if_flags &= ~IFF_RUNNING;
2099
2100 callout_stop(&sc->sc_ad_tmo);
2101 callout_stop(&sc->sc_md_tmo);
2102 callout_stop(&sc->sc_md6_tmo);
2103
2104 if (!detach && sc->sc_state == MASTER)
2105 carp_send_ad(sc);
2106
2107 if (sc->sc_suppress)
2108 carp_suppress_preempt--;
2109 sc->sc_suppress = 0;
2110
2111 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
2112 carp_suppress_preempt--;
2113 sc->sc_sendad_errors = 0;
2114 sc->sc_sendad_success = 0;
2115
2116 carp_set_state(sc, INIT);
2117 carp_setrun(sc, 0);
2118 }
2119
2120 static void
2121 carp_reset(struct carp_softc *sc, int detach)
2122 {
2123 struct ifnet *cifp = &sc->sc_if;
2124
2125 carp_stop(sc, detach);
2126 if (!sc->sc_dead && (cifp->if_flags & IFF_UP))
2127 cifp->if_flags |= IFF_RUNNING;
2128 }
2129
2130 static int
2131 carp_activate_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
2132 struct ifnet *ifp, const struct in_ifaddr *ia_if, int own)
2133 {
2134 struct ip_moptions *imo = &sc->sc_imo;
2135 struct carp_if *cif;
2136 struct carp_softc *vr, *after = NULL;
2137 int onlist, error;
2138 #ifdef INVARIANTS
2139 int assert_onlist;
2140 #endif
2141
2142 KKASSERT(vha->vha_ia != NULL);
2143
2144 KASSERT(ia_if != NULL, ("NULL backing address\n"));
2145 KASSERT(vha->vha_iaback == NULL, ("%p is already activated\n", vha));
2146 KASSERT((vha->vha_flags & CARP_VHAF_OWNER) == 0,
2147 ("inactive vhaddr %p is the address owner\n", vha));
2148
2149 KASSERT(sc->sc_carpdev == NULL || sc->sc_carpdev == ifp,
2150 ("%s is already on %s\n", sc->sc_if.if_xname,
2151 sc->sc_carpdev->if_xname));
2152
2153 KASSERT(imo->imo_multicast_ifp == NULL ||
2154 imo->imo_multicast_ifp == ifp,
2155 ("%s didn't leave mcast group on %s\n",
2156 sc->sc_if.if_xname, imo->imo_multicast_ifp->if_xname));
2157
2158 if (imo->imo_num_memberships == 0) {
2159 struct in_addr addr;
2160
2161 addr.s_addr = htonl(INADDR_CARP_GROUP);
2162 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL)
2163 return ENOBUFS;
2164 imo->imo_num_memberships++;
2165 imo->imo_multicast_ifp = ifp;
2166 imo->imo_multicast_ttl = CARP_DFLTTL;
2167 imo->imo_multicast_loop = 0;
2168 }
2169
2170 if (!ifp->if_carp) {
2171 KASSERT(sc->sc_carpdev == NULL,
2172 ("%s is already on %s\n", sc->sc_if.if_xname,
2173 sc->sc_carpdev->if_xname));
2174
2175 cif = kmalloc(sizeof(*cif), M_CARP, M_WAITOK | M_ZERO);
2176
2177 error = ifpromisc(ifp, 1);
2178 if (error) {
2179 kfree(cif, M_CARP);
2180 goto cleanup;
2181 }
2182
2183 TAILQ_INIT(&cif->vhif_vrs);
2184 ifp->if_carp = cif;
2185 } else {
2186 cif = ifp->if_carp;
2187 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
2188 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
2189 error = EINVAL;
2190 goto cleanup;
2191 }
2192 }
2193 }
2194
2195 #ifdef INVARIANTS
2196 if (sc->sc_carpdev != NULL)
2197 assert_onlist = 1;
2198 else
2199 assert_onlist = 0;
2200 #endif
2201 sc->sc_ia = ia_if;
2202 sc->sc_carpdev = ifp;
2203
2204 cif = ifp->if_carp;
2205 onlist = 0;
2206 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
2207 if (vr == sc)
2208 onlist = 1;
2209 if (vr->sc_vhid < sc->sc_vhid)
2210 after = vr;
2211 }
2212
2213 #ifdef INVARIANTS
2214 if (assert_onlist) {
2215 KASSERT(onlist, ("%s is not on %s carp list\n",
2216 sc->sc_if.if_xname, ifp->if_xname));
2217 } else {
2218 KASSERT(!onlist, ("%s is already on %s carp list\n",
2219 sc->sc_if.if_xname, ifp->if_xname));
2220 }
2221 #endif
2222
2223 if (!onlist) {
2224 /* We're trying to keep things in order */
2225 if (after == NULL)
2226 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
2227 else
2228 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
2229 }
2230
2231 vha->vha_iaback = ia_if;
2232 sc->sc_naddrs++;
2233
2234 if (own) {
2235 vha->vha_flags |= CARP_VHAF_OWNER;
2236
2237 /* XXX save user configured advskew? */
2238 sc->sc_advskew = 0;
2239 }
2240
2241 carp_hmac_prepare(sc);
2242 carp_set_state(sc, INIT);
2243 carp_setrun(sc, 0);
2244 return 0;
2245 cleanup:
2246 carp_multicast_cleanup(sc);
2247 return error;
2248 }
2249
2250 static void
2251 carp_deactivate_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha)
2252 {
2253 KKASSERT(vha->vha_ia != NULL);
2254
2255 carp_hmac_prepare(sc);
2256
2257 if (vha->vha_iaback == NULL) {
2258 KASSERT((vha->vha_flags & CARP_VHAF_OWNER) == 0,
2259 ("inactive vhaddr %p is the address owner\n", vha));
2260 return;
2261 }
2262
2263 vha->vha_flags &= ~CARP_VHAF_OWNER;
2264
2265 KKASSERT(sc->sc_naddrs > 0);
2266 vha->vha_iaback = NULL;
2267 sc->sc_naddrs--;
2268 if (!sc->sc_naddrs) {
2269 if (sc->sc_naddrs6) {
2270 carp_multicast_cleanup(sc);
2271 sc->sc_ia = NULL;
2272 } else {
2273 carp_detach(sc, 0);
2274 }
2275 }
2276 }
2277
2278 static void
2279 carp_link_addrs(struct carp_softc *sc, struct ifnet *ifp, struct ifaddr *ifa_if)
2280 {
2281 struct carp_vhaddr *vha;
2282 struct in_ifaddr *ia_if;
2283
2284 KKASSERT(ifa_if->ifa_addr->sa_family == AF_INET);
2285 ia_if = ifatoia(ifa_if);
2286
2287 if ((ia_if->ia_flags & IFA_ROUTE) == 0)
2288 return;
2289
2290 /*
2291 * Test each inactive vhaddr against the newly added address.
2292 * If the newly added address could be the backing address,
2293 * then activate the matching vhaddr.
2294 */
2295 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
2296 const struct in_ifaddr *ia;
2297 u_long iaddr;
2298 int own;
2299
2300 if (vha->vha_iaback != NULL)
2301 continue;
2302
2303 ia = vha->vha_ia;
2304 iaddr = ntohl(ia->ia_addr.sin_addr.s_addr);
2305
2306 if ((iaddr & ia_if->ia_subnetmask) != ia_if->ia_subnet)
2307 continue;
2308
2309 own = 0;
2310 if (ia->ia_addr.sin_addr.s_addr ==
2311 ia_if->ia_addr.sin_addr.s_addr)
2312 own = 1;
2313
2314 carp_activate_vhaddr(sc, vha, ifp, ia_if, own);
2315 }
2316 }
2317
2318 static void
2319 carp_unlink_addrs(struct carp_softc *sc, struct ifnet *ifp,
2320 struct ifaddr *ifa_if)
2321 {
2322 struct carp_vhaddr *vha;
2323 struct in_ifaddr *ia_if;
2324
2325 KKASSERT(ifa_if->ifa_addr->sa_family == AF_INET);
2326 ia_if = ifatoia(ifa_if);
2327
2328 /*
2329 * Ad src address is deleted; set it to NULL.
2330 * Following loop will try pick up a new ad src address
2331 * if one of the vhaddr could retain its backing address.
2332 */
2333 if (sc->sc_ia == ia_if)
2334 sc->sc_ia = NULL;
2335
2336 /*
2337 * Test each active vhaddr against the deleted address.
2338 * If the deleted address is vhaddr address's backing
2339 * address, then deactivate the vhaddr.
2340 */
2341 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
2342 if (vha->vha_iaback == NULL)
2343 continue;
2344
2345 if (vha->vha_iaback == ia_if)
2346 carp_deactivate_vhaddr(sc, vha);
2347 else if (sc->sc_ia == NULL)
2348 sc->sc_ia = vha->vha_iaback;
2349 }
2350 }
2351
2352 static void
2353 carp_update_addrs(struct carp_softc *sc)
2354 {
2355 struct carp_vhaddr *vha;
2356
2357 KKASSERT(sc->sc_carpdev == NULL);
2358
2359 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
2360 carp_config_vhaddr(sc, vha);
2361 }
2362
2363 static void
2364 carp_ifaddr(void *arg __unused, struct ifnet *ifp,
2365 enum ifaddr_event event, struct ifaddr *ifa)
2366 {
2367 struct carp_softc *sc;
2368
2369 if (ifa->ifa_addr->sa_family != AF_INET)
2370 return;
2371
2372 if (ifp->if_type == IFT_CARP) {
2373 /*
2374 * Address is changed on carp(4) interface
2375 */
2376 switch (event) {
2377 case IFADDR_EVENT_ADD:
2378 carp_add_addr(ifp->if_softc, ifa);
2379 break;
2380
2381 case IFADDR_EVENT_CHANGE:
2382 carp_config_addr(ifp->if_softc, ifa);
2383 break;
2384
2385 case IFADDR_EVENT_DELETE:
2386 carp_del_addr(ifp->if_softc, ifa);
2387 break;
2388 }
2389 return;
2390 }
2391
2392 /*
2393 * Address is changed on non-carp(4) interface
2394 */
2395 if ((ifp->if_flags & IFF_MULTICAST) == 0)
2396 return;
2397
2398 crit_enter();
2399 LIST_FOREACH(sc, &carpif_list, sc_next) {
2400 if (sc->sc_carpdev != NULL && sc->sc_carpdev != ifp) {
2401 /* Not the parent iface; skip */
2402 continue;
2403 }
2404
2405 switch (event) {
2406 case IFADDR_EVENT_ADD:
2407 carp_link_addrs(sc, ifp, ifa);
2408 break;
2409
2410 case IFADDR_EVENT_DELETE:
2411 if (sc->sc_carpdev != NULL) {
2412 carp_unlink_addrs(sc, ifp, ifa);
2413 if (sc->sc_carpdev == NULL)
2414 carp_update_addrs(sc);
2415 } else {
2416 /*
2417 * The carp(4) interface didn't have a
2418 * parent iface, so it is not possible
2419 * that it will contain any address to
2420 * be unlinked.
2421 */
2422 }
2423 break;
2424
2425 case IFADDR_EVENT_CHANGE:
2426 if (sc->sc_carpdev == NULL) {
2427 /*
2428 * The carp(4) interface didn't have a
2429 * parent iface, so it is not possible
2430 * that it will contain any address to
2431 * be updated.
2432 */
2433 carp_link_addrs(sc, ifp, ifa);
2434 } else {
2435 /*
2436 * First try breaking tie with the old
2437 * address. Then see whether we could
2438 * link certain vhaddr to the new address.
2439 * If that fails, i.e. carpdev is NULL,
2440 * we try a global update.
2441 *
2442 * NOTE: The above order is critical.
2443 */
2444 carp_unlink_addrs(sc, ifp, ifa);
2445 carp_link_addrs(sc, ifp, ifa);
2446 if (sc->sc_carpdev == NULL)
2447 carp_update_addrs(sc);
2448 }
2449 break;
2450 }
2451 }
2452 crit_exit();
2453 }
2454
2455 static int
2456 carp_modevent(module_t mod, int type, void *data)
2457 {
2458 switch (type) {
2459 case MOD_LOAD:
2460 LIST_INIT(&carpif_list);
2461 carp_ifdetach_event =
2462 EVENTHANDLER_REGISTER(ifnet_detach_event, carp_ifdetach, NULL,
2463 EVENTHANDLER_PRI_ANY);
2464 carp_ifaddr_event =
2465 EVENTHANDLER_REGISTER(ifaddr_event, carp_ifaddr, NULL,
2466 EVENTHANDLER_PRI_ANY);
2467 if_clone_attach(&carp_cloner);
2468 break;
2469
2470 case MOD_UNLOAD:
2471 EVENTHANDLER_DEREGISTER(ifnet_detach_event,
2472 carp_ifdetach_event);
2473 EVENTHANDLER_DEREGISTER(ifaddr_event,
2474 carp_ifaddr_event);
2475 if_clone_detach(&carp_cloner);
2476 break;
2477
2478 default:
2479 return (EINVAL);
2480 }
2481 return (0);
2482 }
2483
2484 static moduledata_t carp_mod = {
2485 "carp",
2486 carp_modevent,
2487 0
2488 };
2489 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
DragonFly BSD