FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_carp.c
1 /* $FreeBSD: releng/6.4/sys/netinet/ip_carp.c 182656 2008-09-01 23:19:00Z obrien $ */
2
3 /*
4 * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
5 * Copyright (c) 2003 Ryan McBride. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
25 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
26 * THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "opt_carp.h"
30 #include "opt_bpf.h"
31 #include "opt_inet.h"
32 #include "opt_inet6.h"
33
34 #include <sys/types.h>
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/conf.h>
38 #include <sys/kernel.h>
39 #include <sys/limits.h>
40 #include <sys/malloc.h>
41 #include <sys/mbuf.h>
42 #include <sys/module.h>
43 #include <sys/time.h>
44 #include <sys/proc.h>
45 #include <sys/sysctl.h>
46 #include <sys/syslog.h>
47 #include <sys/signalvar.h>
48 #include <sys/filio.h>
49 #include <sys/sockio.h>
50
51 #include <sys/socket.h>
52 #include <sys/vnode.h>
53
54 #include <machine/stdarg.h>
55
56 #include <net/bpf.h>
57 #include <net/ethernet.h>
58 #include <net/fddi.h>
59 #include <net/iso88025.h>
60 #include <net/if.h>
61 #include <net/if_clone.h>
62 #include <net/if_types.h>
63 #include <net/route.h>
64
65 #ifdef INET
66 #include <netinet/in.h>
67 #include <netinet/in_var.h>
68 #include <netinet/in_systm.h>
69 #include <netinet/ip.h>
70 #include <netinet/ip_var.h>
71 #include <netinet/if_ether.h>
72 #include <machine/in_cksum.h>
73 #endif
74
75 #ifdef INET6
76 #include <netinet/icmp6.h>
77 #include <netinet/ip6.h>
78 #include <netinet6/ip6_var.h>
79 #include <netinet6/scope6_var.h>
80 #include <netinet6/nd6.h>
81 #include <net/if_dl.h>
82 #endif
83
84 #include <crypto/sha1.h>
85 #include <netinet/ip_carp.h>
86
87 #define CARP_IFNAME "carp"
88 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces");
89 SYSCTL_DECL(_net_inet_carp);
90
91 struct carp_softc {
92 struct ifnet *sc_ifp; /* Interface clue */
93 struct ifnet *sc_carpdev; /* Pointer to parent interface */
94 struct in_ifaddr *sc_ia; /* primary iface address */
95 struct ip_moptions sc_imo;
96 #ifdef INET6
97 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */
98 struct ip6_moptions sc_im6o;
99 #endif /* INET6 */
100 TAILQ_ENTRY(carp_softc) sc_list;
101
102 enum { INIT = 0, BACKUP, MASTER } sc_state;
103
104 int sc_flags_backup;
105 int sc_suppress;
106
107 int sc_sendad_errors;
108 #define CARP_SENDAD_MAX_ERRORS 3
109 int sc_sendad_success;
110 #define CARP_SENDAD_MIN_SUCCESS 3
111
112 int sc_vhid;
113 int sc_advskew;
114 int sc_naddrs;
115 int sc_naddrs6;
116 int sc_advbase; /* seconds */
117 int sc_init_counter;
118 u_int64_t sc_counter;
119
120 /* authentication */
121 #define CARP_HMAC_PAD 64
122 unsigned char sc_key[CARP_KEY_LEN];
123 unsigned char sc_pad[CARP_HMAC_PAD];
124 SHA1_CTX sc_sha1;
125
126 struct callout sc_ad_tmo; /* advertisement timeout */
127 struct callout sc_md_tmo; /* master down timeout */
128 struct callout sc_md6_tmo; /* master down timeout */
129
130 LIST_ENTRY(carp_softc) sc_next; /* Interface clue */
131 };
132 #define SC2IFP(sc) ((sc)->sc_ifp)
133
134 int carp_suppress_preempt = 0;
135 int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */
136 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW,
137 &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets");
138 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW,
139 &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode");
140 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW,
141 &carp_opts[CARPCTL_LOG], 0, "log bad carp packets");
142 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW,
143 &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses");
144 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD,
145 &carp_suppress_preempt, 0, "Preemption is suppressed");
146
147 struct carpstats carpstats;
148 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW,
149 &carpstats, carpstats,
150 "CARP statistics (struct carpstats, netinet/ip_carp.h)");
151
152 struct carp_if {
153 TAILQ_HEAD(, carp_softc) vhif_vrs;
154 int vhif_nvrs;
155
156 struct ifnet *vhif_ifp;
157 struct mtx vhif_mtx;
158 };
159
160 /* Get carp_if from softc. Valid after carp_set_addr{,6}. */
161 #define SC2CIF(sc) ((struct carp_if *)(sc)->sc_carpdev->if_carp)
162
163 /* lock per carp_if queue */
164 #define CARP_LOCK_INIT(cif) mtx_init(&(cif)->vhif_mtx, "carp_if", \
165 NULL, MTX_DEF)
166 #define CARP_LOCK_DESTROY(cif) mtx_destroy(&(cif)->vhif_mtx)
167 #define CARP_LOCK_ASSERT(cif) mtx_assert(&(cif)->vhif_mtx, MA_OWNED)
168 #define CARP_LOCK(cif) mtx_lock(&(cif)->vhif_mtx)
169 #define CARP_UNLOCK(cif) mtx_unlock(&(cif)->vhif_mtx)
170
171 #define CARP_SCLOCK(sc) mtx_lock(&SC2CIF(sc)->vhif_mtx)
172 #define CARP_SCUNLOCK(sc) mtx_unlock(&SC2CIF(sc)->vhif_mtx)
173 #define CARP_SCLOCK_ASSERT(sc) mtx_assert(&SC2CIF(sc)->vhif_mtx, MA_OWNED)
174
175 #define CARP_LOG(...) do { \
176 if (carp_opts[CARPCTL_LOG] > 0) \
177 log(LOG_INFO, __VA_ARGS__); \
178 } while (0)
179
180 #define CARP_DEBUG(...) do { \
181 if (carp_opts[CARPCTL_LOG] > 1) \
182 log(LOG_DEBUG, __VA_ARGS__); \
183 } while (0)
184
185 static void carp_hmac_prepare(struct carp_softc *);
186 static void carp_hmac_generate(struct carp_softc *, u_int32_t *,
187 unsigned char *);
188 static int carp_hmac_verify(struct carp_softc *, u_int32_t *,
189 unsigned char *);
190 static void carp_setroute(struct carp_softc *, int);
191 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t);
192 static int carp_clone_create(struct if_clone *, int);
193 static void carp_clone_destroy(struct ifnet *);
194 static void carpdetach(struct carp_softc *, int);
195 static int carp_prepare_ad(struct mbuf *, struct carp_softc *,
196 struct carp_header *);
197 static void carp_send_ad_all(void);
198 static void carp_send_ad(void *);
199 static void carp_send_ad_locked(struct carp_softc *);
200 static void carp_send_arp(struct carp_softc *);
201 static void carp_master_down(void *);
202 static void carp_master_down_locked(struct carp_softc *);
203 static int carp_ioctl(struct ifnet *, u_long, caddr_t);
204 static int carp_looutput(struct ifnet *, struct mbuf *, struct sockaddr *,
205 struct rtentry *);
206 static void carp_start(struct ifnet *);
207 static void carp_setrun(struct carp_softc *, sa_family_t);
208 static void carp_set_state(struct carp_softc *, int);
209 static int carp_addrcount(struct carp_if *, struct in_ifaddr *, int);
210 enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING };
211
212 static void carp_multicast_cleanup(struct carp_softc *);
213 static int carp_set_addr(struct carp_softc *, struct sockaddr_in *);
214 static int carp_del_addr(struct carp_softc *, struct sockaddr_in *);
215 static void carp_carpdev_state_locked(struct carp_if *);
216 static void carp_sc_state_locked(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 #endif
222
223 static LIST_HEAD(, carp_softc) carpif_list;
224 static struct mtx carp_mtx;
225 IFC_SIMPLE_DECLARE(carp, 0);
226
227 static eventhandler_tag if_detach_event_tag;
228
229 static __inline u_int16_t
230 carp_cksum(struct mbuf *m, int len)
231 {
232 return (in_cksum(m, len));
233 }
234
235 static void
236 carp_hmac_prepare(struct carp_softc *sc)
237 {
238 u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
239 u_int8_t vhid = sc->sc_vhid & 0xff;
240 struct ifaddr *ifa;
241 int i;
242 #ifdef INET6
243 struct in6_addr in6;
244 #endif
245
246 if (sc->sc_carpdev)
247 CARP_SCLOCK(sc);
248
249 /* XXX: possible race here */
250
251 /* compute ipad from key */
252 bzero(sc->sc_pad, sizeof(sc->sc_pad));
253 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
254 for (i = 0; i < sizeof(sc->sc_pad); i++)
255 sc->sc_pad[i] ^= 0x36;
256
257 /* precompute first part of inner hash */
258 SHA1Init(&sc->sc_sha1);
259 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
260 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
261 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
262 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
263 #ifdef INET
264 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
265 if (ifa->ifa_addr->sa_family == AF_INET)
266 SHA1Update(&sc->sc_sha1,
267 (void *)&ifatoia(ifa)->ia_addr.sin_addr.s_addr,
268 sizeof(struct in_addr));
269 }
270 #endif /* INET */
271 #ifdef INET6
272 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
273 if (ifa->ifa_addr->sa_family == AF_INET6) {
274 in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
275 in6_clearscope(&in6);
276 SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6));
277 }
278 }
279 #endif /* INET6 */
280
281 /* convert ipad to opad */
282 for (i = 0; i < sizeof(sc->sc_pad); i++)
283 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
284
285 if (sc->sc_carpdev)
286 CARP_SCUNLOCK(sc);
287 }
288
289 static void
290 carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2],
291 unsigned char md[20])
292 {
293 SHA1_CTX sha1ctx;
294
295 /* fetch first half of inner hash */
296 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
297
298 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
299 SHA1Final(md, &sha1ctx);
300
301 /* outer hash */
302 SHA1Init(&sha1ctx);
303 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
304 SHA1Update(&sha1ctx, md, 20);
305 SHA1Final(md, &sha1ctx);
306 }
307
308 static int
309 carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2],
310 unsigned char md[20])
311 {
312 unsigned char md2[20];
313
314 CARP_SCLOCK_ASSERT(sc);
315
316 carp_hmac_generate(sc, counter, md2);
317
318 return (bcmp(md, md2, sizeof(md2)));
319 }
320
321 static void
322 carp_setroute(struct carp_softc *sc, int cmd)
323 {
324 struct ifaddr *ifa;
325 int s;
326
327 if (sc->sc_carpdev)
328 CARP_SCLOCK_ASSERT(sc);
329
330 s = splnet();
331 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
332 if (ifa->ifa_addr->sa_family == AF_INET &&
333 sc->sc_carpdev != NULL) {
334 int count = carp_addrcount(
335 (struct carp_if *)sc->sc_carpdev->if_carp,
336 ifatoia(ifa), CARP_COUNT_MASTER);
337
338 if ((cmd == RTM_ADD && count == 1) ||
339 (cmd == RTM_DELETE && count == 0))
340 rtinit(ifa, cmd, RTF_UP | RTF_HOST);
341 }
342 #ifdef INET6
343 if (ifa->ifa_addr->sa_family == AF_INET6) {
344 if (cmd == RTM_ADD)
345 in6_ifaddloop(ifa);
346 else
347 in6_ifremloop(ifa);
348 }
349 #endif /* INET6 */
350 }
351 splx(s);
352 }
353
354 static int
355 carp_clone_create(struct if_clone *ifc, int unit)
356 {
357
358 struct carp_softc *sc;
359 struct ifnet *ifp;
360
361 MALLOC(sc, struct carp_softc *, sizeof(*sc), M_CARP, M_WAITOK|M_ZERO);
362 ifp = SC2IFP(sc) = if_alloc(IFT_ETHER);
363 if (ifp == NULL) {
364 FREE(sc, M_CARP);
365 return (ENOSPC);
366 }
367
368 sc->sc_flags_backup = 0;
369 sc->sc_suppress = 0;
370 sc->sc_advbase = CARP_DFLTINTV;
371 sc->sc_vhid = -1; /* required setting */
372 sc->sc_advskew = 0;
373 sc->sc_init_counter = 1;
374 sc->sc_naddrs = sc->sc_naddrs6 = 0; /* M_ZERO? */
375 #ifdef INET6
376 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
377 #endif
378 sc->sc_imo.imo_multicast_vif = -1;
379
380 callout_init(&sc->sc_ad_tmo, NET_CALLOUT_MPSAFE);
381 callout_init(&sc->sc_md_tmo, NET_CALLOUT_MPSAFE);
382 callout_init(&sc->sc_md6_tmo, NET_CALLOUT_MPSAFE);
383
384 ifp->if_softc = sc;
385 if_initname(ifp, CARP_IFNAME, unit);
386 ifp->if_mtu = ETHERMTU;
387 ifp->if_flags = IFF_LOOPBACK;
388 ifp->if_ioctl = carp_ioctl;
389 ifp->if_output = carp_looutput;
390 ifp->if_start = carp_start;
391 ifp->if_type = IFT_CARP;
392 ifp->if_snd.ifq_maxlen = ifqmaxlen;
393 ifp->if_hdrlen = 0;
394 if_attach(ifp);
395 bpfattach(SC2IFP(sc), DLT_NULL, sizeof(u_int32_t));
396 mtx_lock(&carp_mtx);
397 LIST_INSERT_HEAD(&carpif_list, sc, sc_next);
398 mtx_unlock(&carp_mtx);
399 return (0);
400 }
401
402 static void
403 carp_clone_destroy(struct ifnet *ifp)
404 {
405 struct carp_softc *sc = ifp->if_softc;
406
407 if (sc->sc_carpdev)
408 CARP_SCLOCK(sc);
409 carpdetach(sc, 1); /* Returns unlocked. */
410
411 mtx_lock(&carp_mtx);
412 LIST_REMOVE(sc, sc_next);
413 mtx_unlock(&carp_mtx);
414 bpfdetach(ifp);
415 if_detach(ifp);
416 if_free_type(ifp, IFT_ETHER);
417 free(sc, M_CARP);
418 }
419
420 static void
421 carpdetach(struct carp_softc *sc, int unlock)
422 {
423 struct carp_if *cif;
424
425 callout_stop(&sc->sc_ad_tmo);
426 callout_stop(&sc->sc_md_tmo);
427 callout_stop(&sc->sc_md6_tmo);
428
429 if (sc->sc_suppress)
430 carp_suppress_preempt--;
431 sc->sc_suppress = 0;
432
433 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
434 carp_suppress_preempt--;
435 sc->sc_sendad_errors = 0;
436
437 carp_set_state(sc, INIT);
438 SC2IFP(sc)->if_flags &= ~IFF_UP;
439 carp_setrun(sc, 0);
440 carp_multicast_cleanup(sc);
441
442 if (sc->sc_carpdev != NULL) {
443 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
444 CARP_LOCK_ASSERT(cif);
445 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
446 if (!--cif->vhif_nvrs) {
447 ifpromisc(sc->sc_carpdev, 0);
448 sc->sc_carpdev->if_carp = NULL;
449 CARP_LOCK_DESTROY(cif);
450 FREE(cif, M_IFADDR);
451 } else if (unlock)
452 CARP_UNLOCK(cif);
453 sc->sc_carpdev = NULL;
454 }
455 }
456
457 /* Detach an interface from the carp. */
458 static void
459 carp_ifdetach(void *arg __unused, struct ifnet *ifp)
460 {
461 struct carp_if *cif = (struct carp_if *)ifp->if_carp;
462 struct carp_softc *sc, *nextsc;
463
464 if (cif == NULL)
465 return;
466
467 /*
468 * XXX: At the end of for() cycle the lock will be destroyed.
469 */
470 CARP_LOCK(cif);
471 for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) {
472 nextsc = TAILQ_NEXT(sc, sc_list);
473 carpdetach(sc, 0);
474 }
475 }
476
477 /*
478 * process input packet.
479 * we have rearranged checks order compared to the rfc,
480 * but it seems more efficient this way or not possible otherwise.
481 */
482 void
483 carp_input(struct mbuf *m, int hlen)
484 {
485 struct ip *ip = mtod(m, struct ip *);
486 struct carp_header *ch;
487 int iplen, len;
488
489 carpstats.carps_ipackets++;
490
491 if (!carp_opts[CARPCTL_ALLOW]) {
492 m_freem(m);
493 return;
494 }
495
496 /* check if received on a valid carp interface */
497 if (m->m_pkthdr.rcvif->if_carp == NULL) {
498 carpstats.carps_badif++;
499 CARP_LOG("carp_input: packet received on non-carp "
500 "interface: %s\n",
501 m->m_pkthdr.rcvif->if_xname);
502 m_freem(m);
503 return;
504 }
505
506 /* verify that the IP TTL is 255. */
507 if (ip->ip_ttl != CARP_DFLTTL) {
508 carpstats.carps_badttl++;
509 CARP_LOG("carp_input: received ttl %d != 255i on %s\n",
510 ip->ip_ttl,
511 m->m_pkthdr.rcvif->if_xname);
512 m_freem(m);
513 return;
514 }
515
516 iplen = ip->ip_hl << 2;
517
518 if (m->m_pkthdr.len < iplen + sizeof(*ch)) {
519 carpstats.carps_badlen++;
520 CARP_LOG("carp_input: received len %zd < "
521 "sizeof(struct carp_header)\n",
522 m->m_len - sizeof(struct ip));
523 m_freem(m);
524 return;
525 }
526
527 if (iplen + sizeof(*ch) < m->m_len) {
528 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) {
529 carpstats.carps_hdrops++;
530 CARP_LOG("carp_input: pullup failed\n");
531 return;
532 }
533 ip = mtod(m, struct ip *);
534 }
535 ch = (struct carp_header *)((char *)ip + iplen);
536
537 /*
538 * verify that the received packet length is
539 * equal to the CARP header
540 */
541 len = iplen + sizeof(*ch);
542 if (len > m->m_pkthdr.len) {
543 carpstats.carps_badlen++;
544 CARP_LOG("carp_input: packet too short %d on %s\n",
545 m->m_pkthdr.len,
546 m->m_pkthdr.rcvif->if_xname);
547 m_freem(m);
548 return;
549 }
550
551 if ((m = m_pullup(m, len)) == NULL) {
552 carpstats.carps_hdrops++;
553 return;
554 }
555 ip = mtod(m, struct ip *);
556 ch = (struct carp_header *)((char *)ip + iplen);
557
558 /* verify the CARP checksum */
559 m->m_data += iplen;
560 if (carp_cksum(m, len - iplen)) {
561 carpstats.carps_badsum++;
562 CARP_LOG("carp_input: checksum failed on %s\n",
563 m->m_pkthdr.rcvif->if_xname);
564 m_freem(m);
565 return;
566 }
567 m->m_data -= iplen;
568
569 carp_input_c(m, ch, AF_INET);
570 }
571
572 #ifdef INET6
573 int
574 carp6_input(struct mbuf **mp, int *offp, int proto)
575 {
576 struct mbuf *m = *mp;
577 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
578 struct carp_header *ch;
579 u_int len;
580
581 carpstats.carps_ipackets6++;
582
583 if (!carp_opts[CARPCTL_ALLOW]) {
584 m_freem(m);
585 return (IPPROTO_DONE);
586 }
587
588 /* check if received on a valid carp interface */
589 if (m->m_pkthdr.rcvif->if_carp == NULL) {
590 carpstats.carps_badif++;
591 CARP_LOG("carp6_input: packet received on non-carp "
592 "interface: %s\n",
593 m->m_pkthdr.rcvif->if_xname);
594 m_freem(m);
595 return (IPPROTO_DONE);
596 }
597
598 /* verify that the IP TTL is 255 */
599 if (ip6->ip6_hlim != CARP_DFLTTL) {
600 carpstats.carps_badttl++;
601 CARP_LOG("carp6_input: received ttl %d != 255 on %s\n",
602 ip6->ip6_hlim,
603 m->m_pkthdr.rcvif->if_xname);
604 m_freem(m);
605 return (IPPROTO_DONE);
606 }
607
608 /* verify that we have a complete carp packet */
609 len = m->m_len;
610 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
611 if (ch == NULL) {
612 carpstats.carps_badlen++;
613 CARP_LOG("carp6_input: packet size %u too small\n", len);
614 return (IPPROTO_DONE);
615 }
616
617
618 /* verify the CARP checksum */
619 m->m_data += *offp;
620 if (carp_cksum(m, sizeof(*ch))) {
621 carpstats.carps_badsum++;
622 CARP_LOG("carp6_input: checksum failed, on %s\n",
623 m->m_pkthdr.rcvif->if_xname);
624 m_freem(m);
625 return (IPPROTO_DONE);
626 }
627 m->m_data -= *offp;
628
629 carp_input_c(m, ch, AF_INET6);
630 return (IPPROTO_DONE);
631 }
632 #endif /* INET6 */
633
634 static void
635 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af)
636 {
637 struct ifnet *ifp = m->m_pkthdr.rcvif;
638 struct carp_softc *sc;
639 u_int64_t tmp_counter;
640 struct timeval sc_tv, ch_tv;
641
642 /* verify that the VHID is valid on the receiving interface */
643 CARP_LOCK(ifp->if_carp);
644 TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list)
645 if (sc->sc_vhid == ch->carp_vhid)
646 break;
647
648 if (!sc || !((SC2IFP(sc)->if_flags & IFF_UP) &&
649 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) {
650 carpstats.carps_badvhid++;
651 CARP_UNLOCK(ifp->if_carp);
652 m_freem(m);
653 return;
654 }
655
656 getmicrotime(&SC2IFP(sc)->if_lastchange);
657 SC2IFP(sc)->if_ipackets++;
658 SC2IFP(sc)->if_ibytes += m->m_pkthdr.len;
659
660 if (bpf_peers_present(SC2IFP(sc)->if_bpf)) {
661 struct ip *ip = mtod(m, struct ip *);
662 uint32_t af1 = af;
663
664 /* BPF wants net byte order */
665 ip->ip_len = htons(ip->ip_len + (ip->ip_hl << 2));
666 ip->ip_off = htons(ip->ip_off);
667 bpf_mtap2(SC2IFP(sc)->if_bpf, &af1, sizeof(af1), m);
668 }
669
670 /* verify the CARP version. */
671 if (ch->carp_version != CARP_VERSION) {
672 carpstats.carps_badver++;
673 SC2IFP(sc)->if_ierrors++;
674 CARP_UNLOCK(ifp->if_carp);
675 CARP_LOG("%s; invalid version %d\n",
676 SC2IFP(sc)->if_xname,
677 ch->carp_version);
678 m_freem(m);
679 return;
680 }
681
682 /* verify the hash */
683 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
684 carpstats.carps_badauth++;
685 SC2IFP(sc)->if_ierrors++;
686 CARP_UNLOCK(ifp->if_carp);
687 CARP_LOG("%s: incorrect hash\n", SC2IFP(sc)->if_xname);
688 m_freem(m);
689 return;
690 }
691
692 tmp_counter = ntohl(ch->carp_counter[0]);
693 tmp_counter = tmp_counter<<32;
694 tmp_counter += ntohl(ch->carp_counter[1]);
695
696 /* XXX Replay protection goes here */
697
698 sc->sc_init_counter = 0;
699 sc->sc_counter = tmp_counter;
700
701 sc_tv.tv_sec = sc->sc_advbase;
702 if (carp_suppress_preempt && sc->sc_advskew < 240)
703 sc_tv.tv_usec = 240 * 1000000 / 256;
704 else
705 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256;
706 ch_tv.tv_sec = ch->carp_advbase;
707 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
708
709 switch (sc->sc_state) {
710 case INIT:
711 break;
712 case MASTER:
713 /*
714 * If we receive an advertisement from a master who's going to
715 * be more frequent than us, go into BACKUP state.
716 */
717 if (timevalcmp(&sc_tv, &ch_tv, >) ||
718 timevalcmp(&sc_tv, &ch_tv, ==)) {
719 callout_stop(&sc->sc_ad_tmo);
720 CARP_DEBUG("%s: MASTER -> BACKUP "
721 "(more frequent advertisement received)\n",
722 SC2IFP(sc)->if_xname);
723 carp_set_state(sc, BACKUP);
724 carp_setrun(sc, 0);
725 carp_setroute(sc, RTM_DELETE);
726 }
727 break;
728 case BACKUP:
729 /*
730 * If we're pre-empting masters who advertise slower than us,
731 * and this one claims to be slower, treat him as down.
732 */
733 if (carp_opts[CARPCTL_PREEMPT] &&
734 timevalcmp(&sc_tv, &ch_tv, <)) {
735 CARP_DEBUG("%s: BACKUP -> MASTER "
736 "(preempting a slower master)\n",
737 SC2IFP(sc)->if_xname);
738 carp_master_down_locked(sc);
739 break;
740 }
741
742 /*
743 * If the master is going to advertise at such a low frequency
744 * that he's guaranteed to time out, we'd might as well just
745 * treat him as timed out now.
746 */
747 sc_tv.tv_sec = sc->sc_advbase * 3;
748 if (timevalcmp(&sc_tv, &ch_tv, <)) {
749 CARP_DEBUG("%s: BACKUP -> MASTER "
750 "(master timed out)\n",
751 SC2IFP(sc)->if_xname);
752 carp_master_down_locked(sc);
753 break;
754 }
755
756 /*
757 * Otherwise, we reset the counter and wait for the next
758 * advertisement.
759 */
760 carp_setrun(sc, af);
761 break;
762 }
763
764 CARP_UNLOCK(ifp->if_carp);
765
766 m_freem(m);
767 return;
768 }
769
770 static int
771 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch)
772 {
773 struct m_tag *mtag;
774 struct ifnet *ifp = SC2IFP(sc);
775
776 if (sc->sc_init_counter) {
777 /* this could also be seconds since unix epoch */
778 sc->sc_counter = arc4random();
779 sc->sc_counter = sc->sc_counter << 32;
780 sc->sc_counter += arc4random();
781 } else
782 sc->sc_counter++;
783
784 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff);
785 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff);
786
787 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
788
789 /* Tag packet for carp_output */
790 mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct ifnet *), M_NOWAIT);
791 if (mtag == NULL) {
792 m_freem(m);
793 SC2IFP(sc)->if_oerrors++;
794 return (ENOMEM);
795 }
796 bcopy(&ifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *));
797 m_tag_prepend(m, mtag);
798
799 return (0);
800 }
801
802 static void
803 carp_send_ad_all(void)
804 {
805 struct carp_softc *sc;
806
807 mtx_lock(&carp_mtx);
808 LIST_FOREACH(sc, &carpif_list, sc_next) {
809 if (sc->sc_carpdev == NULL)
810 continue;
811 CARP_SCLOCK(sc);
812 if ((SC2IFP(sc)->if_flags & IFF_UP) &&
813 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING) &&
814 sc->sc_state == MASTER)
815 carp_send_ad_locked(sc);
816 CARP_SCUNLOCK(sc);
817 }
818 mtx_unlock(&carp_mtx);
819 }
820
821 static void
822 carp_send_ad(void *v)
823 {
824 struct carp_softc *sc = v;
825
826 CARP_SCLOCK(sc);
827 carp_send_ad_locked(sc);
828 CARP_SCUNLOCK(sc);
829 }
830
831 static void
832 carp_send_ad_locked(struct carp_softc *sc)
833 {
834 struct carp_header ch;
835 struct timeval tv;
836 struct carp_header *ch_ptr;
837 struct mbuf *m;
838 int len, advbase, advskew;
839
840 CARP_SCLOCK_ASSERT(sc);
841
842 /* bow out if we've lost our UPness or RUNNINGuiness */
843 if (!((SC2IFP(sc)->if_flags & IFF_UP) &&
844 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) {
845 advbase = 255;
846 advskew = 255;
847 } else {
848 advbase = sc->sc_advbase;
849 if (!carp_suppress_preempt || sc->sc_advskew > 240)
850 advskew = sc->sc_advskew;
851 else
852 advskew = 240;
853 tv.tv_sec = advbase;
854 tv.tv_usec = advskew * 1000000 / 256;
855 }
856
857 ch.carp_version = CARP_VERSION;
858 ch.carp_type = CARP_ADVERTISEMENT;
859 ch.carp_vhid = sc->sc_vhid;
860 ch.carp_advbase = advbase;
861 ch.carp_advskew = advskew;
862 ch.carp_authlen = 7; /* XXX DEFINE */
863 ch.carp_pad1 = 0; /* must be zero */
864 ch.carp_cksum = 0;
865
866 #ifdef INET
867 if (sc->sc_ia) {
868 struct ip *ip;
869
870 MGETHDR(m, M_DONTWAIT, MT_HEADER);
871 if (m == NULL) {
872 SC2IFP(sc)->if_oerrors++;
873 carpstats.carps_onomem++;
874 /* XXX maybe less ? */
875 if (advbase != 255 || advskew != 255)
876 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
877 carp_send_ad, sc);
878 return;
879 }
880 len = sizeof(*ip) + sizeof(ch);
881 m->m_pkthdr.len = len;
882 m->m_pkthdr.rcvif = NULL;
883 m->m_len = len;
884 MH_ALIGN(m, m->m_len);
885 m->m_flags |= M_MCAST;
886 ip = mtod(m, struct ip *);
887 ip->ip_v = IPVERSION;
888 ip->ip_hl = sizeof(*ip) >> 2;
889 ip->ip_tos = IPTOS_LOWDELAY;
890 ip->ip_len = len;
891 ip->ip_id = ip_newid();
892 ip->ip_off = IP_DF;
893 ip->ip_ttl = CARP_DFLTTL;
894 ip->ip_p = IPPROTO_CARP;
895 ip->ip_sum = 0;
896 ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr;
897 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
898
899 ch_ptr = (struct carp_header *)(&ip[1]);
900 bcopy(&ch, ch_ptr, sizeof(ch));
901 if (carp_prepare_ad(m, sc, ch_ptr))
902 return;
903
904 m->m_data += sizeof(*ip);
905 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip));
906 m->m_data -= sizeof(*ip);
907
908 getmicrotime(&SC2IFP(sc)->if_lastchange);
909 SC2IFP(sc)->if_opackets++;
910 SC2IFP(sc)->if_obytes += len;
911 carpstats.carps_opackets++;
912
913 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) {
914 SC2IFP(sc)->if_oerrors++;
915 if (sc->sc_sendad_errors < INT_MAX)
916 sc->sc_sendad_errors++;
917 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
918 carp_suppress_preempt++;
919 if (carp_suppress_preempt == 1) {
920 CARP_SCUNLOCK(sc);
921 carp_send_ad_all();
922 CARP_SCLOCK(sc);
923 }
924 }
925 sc->sc_sendad_success = 0;
926 } else {
927 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
928 if (++sc->sc_sendad_success >=
929 CARP_SENDAD_MIN_SUCCESS) {
930 carp_suppress_preempt--;
931 sc->sc_sendad_errors = 0;
932 }
933 } else
934 sc->sc_sendad_errors = 0;
935 }
936 }
937 #endif /* INET */
938 #ifdef INET6
939 if (sc->sc_ia6) {
940 struct ip6_hdr *ip6;
941
942 MGETHDR(m, M_DONTWAIT, MT_HEADER);
943 if (m == NULL) {
944 SC2IFP(sc)->if_oerrors++;
945 carpstats.carps_onomem++;
946 /* XXX maybe less ? */
947 if (advbase != 255 || advskew != 255)
948 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
949 carp_send_ad, sc);
950 return;
951 }
952 len = sizeof(*ip6) + sizeof(ch);
953 m->m_pkthdr.len = len;
954 m->m_pkthdr.rcvif = NULL;
955 m->m_len = len;
956 MH_ALIGN(m, m->m_len);
957 m->m_flags |= M_MCAST;
958 ip6 = mtod(m, struct ip6_hdr *);
959 bzero(ip6, sizeof(*ip6));
960 ip6->ip6_vfc |= IPV6_VERSION;
961 ip6->ip6_hlim = CARP_DFLTTL;
962 ip6->ip6_nxt = IPPROTO_CARP;
963 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src,
964 sizeof(struct in6_addr));
965 /* set the multicast destination */
966
967 ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
968 ip6->ip6_dst.s6_addr8[15] = 0x12;
969 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
970 SC2IFP(sc)->if_oerrors++;
971 m_freem(m);
972 CARP_LOG("%s: in6_setscope failed\n", __func__);
973 return;
974 }
975
976 ch_ptr = (struct carp_header *)(&ip6[1]);
977 bcopy(&ch, ch_ptr, sizeof(ch));
978 if (carp_prepare_ad(m, sc, ch_ptr))
979 return;
980
981 m->m_data += sizeof(*ip6);
982 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6));
983 m->m_data -= sizeof(*ip6);
984
985 getmicrotime(&SC2IFP(sc)->if_lastchange);
986 SC2IFP(sc)->if_opackets++;
987 SC2IFP(sc)->if_obytes += len;
988 carpstats.carps_opackets6++;
989
990 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) {
991 SC2IFP(sc)->if_oerrors++;
992 if (sc->sc_sendad_errors < INT_MAX)
993 sc->sc_sendad_errors++;
994 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
995 carp_suppress_preempt++;
996 if (carp_suppress_preempt == 1) {
997 CARP_SCUNLOCK(sc);
998 carp_send_ad_all();
999 CARP_SCLOCK(sc);
1000 }
1001 }
1002 sc->sc_sendad_success = 0;
1003 } else {
1004 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1005 if (++sc->sc_sendad_success >=
1006 CARP_SENDAD_MIN_SUCCESS) {
1007 carp_suppress_preempt--;
1008 sc->sc_sendad_errors = 0;
1009 }
1010 } else
1011 sc->sc_sendad_errors = 0;
1012 }
1013 }
1014 #endif /* INET6 */
1015
1016 if (advbase != 255 || advskew != 255)
1017 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1018 carp_send_ad, sc);
1019
1020 }
1021
1022 /*
1023 * Broadcast a gratuitous ARP request containing
1024 * the virtual router MAC address for each IP address
1025 * associated with the virtual router.
1026 */
1027 static void
1028 carp_send_arp(struct carp_softc *sc)
1029 {
1030 struct ifaddr *ifa;
1031
1032 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1033
1034 if (ifa->ifa_addr->sa_family != AF_INET)
1035 continue;
1036
1037 /* arprequest(sc->sc_carpdev, &in, &in, IFP2ENADDR(sc->sc_ifp)); */
1038 arp_ifinit2(sc->sc_carpdev, ifa, IFP2ENADDR(sc->sc_ifp));
1039
1040 DELAY(1000); /* XXX */
1041 }
1042 }
1043
1044 #ifdef INET6
1045 static void
1046 carp_send_na(struct carp_softc *sc)
1047 {
1048 struct ifaddr *ifa;
1049 struct in6_addr *in6;
1050 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1051
1052 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1053
1054 if (ifa->ifa_addr->sa_family != AF_INET6)
1055 continue;
1056
1057 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
1058 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1059 ND_NA_FLAG_OVERRIDE, 1, NULL);
1060 DELAY(1000); /* XXX */
1061 }
1062 }
1063 #endif /* INET6 */
1064
1065 static int
1066 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type)
1067 {
1068 struct carp_softc *vh;
1069 struct ifaddr *ifa;
1070 int count = 0;
1071
1072 CARP_LOCK_ASSERT(cif);
1073
1074 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1075 if ((type == CARP_COUNT_RUNNING &&
1076 (SC2IFP(vh)->if_flags & IFF_UP) &&
1077 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) ||
1078 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) {
1079 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist,
1080 ifa_list) {
1081 if (ifa->ifa_addr->sa_family == AF_INET &&
1082 ia->ia_addr.sin_addr.s_addr ==
1083 ifatoia(ifa)->ia_addr.sin_addr.s_addr)
1084 count++;
1085 }
1086 }
1087 }
1088 return (count);
1089 }
1090
1091 int
1092 carp_iamatch(void *v, struct in_ifaddr *ia,
1093 struct in_addr *isaddr, u_int8_t **enaddr)
1094 {
1095 struct carp_if *cif = v;
1096 struct carp_softc *vh;
1097 int index, count = 0;
1098 struct ifaddr *ifa;
1099
1100 CARP_LOCK(cif);
1101
1102 if (carp_opts[CARPCTL_ARPBALANCE]) {
1103 /*
1104 * XXX proof of concept implementation.
1105 * We use the source ip to decide which virtual host should
1106 * handle the request. If we're master of that virtual host,
1107 * then we respond, otherwise, just drop the arp packet on
1108 * the floor.
1109 */
1110 count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING);
1111 if (count == 0) {
1112 /* should never reach this */
1113 CARP_UNLOCK(cif);
1114 return (0);
1115 }
1116
1117 /* this should be a hash, like pf_hash() */
1118 index = ntohl(isaddr->s_addr) % count;
1119 count = 0;
1120
1121 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1122 if ((SC2IFP(vh)->if_flags & IFF_UP) &&
1123 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) {
1124 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist,
1125 ifa_list) {
1126 if (ifa->ifa_addr->sa_family ==
1127 AF_INET &&
1128 ia->ia_addr.sin_addr.s_addr ==
1129 ifatoia(ifa)->ia_addr.sin_addr.s_addr) {
1130 if (count == index) {
1131 if (vh->sc_state ==
1132 MASTER) {
1133 *enaddr = IFP2ENADDR(vh->sc_ifp);
1134 CARP_UNLOCK(cif);
1135 return (1);
1136 } else {
1137 CARP_UNLOCK(cif);
1138 return (0);
1139 }
1140 }
1141 count++;
1142 }
1143 }
1144 }
1145 }
1146 } else {
1147 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1148 if ((SC2IFP(vh)->if_flags & IFF_UP) &&
1149 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
1150 ia->ia_ifp == SC2IFP(vh) &&
1151 vh->sc_state == MASTER) {
1152 *enaddr = IFP2ENADDR(vh->sc_ifp);
1153 CARP_UNLOCK(cif);
1154 return (1);
1155 }
1156 }
1157 }
1158 CARP_UNLOCK(cif);
1159 return (0);
1160 }
1161
1162 #ifdef INET6
1163 struct ifaddr *
1164 carp_iamatch6(void *v, struct in6_addr *taddr)
1165 {
1166 struct carp_if *cif = v;
1167 struct carp_softc *vh;
1168 struct ifaddr *ifa;
1169
1170 CARP_LOCK(cif);
1171 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1172 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, ifa_list) {
1173 if (IN6_ARE_ADDR_EQUAL(taddr,
1174 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1175 (SC2IFP(vh)->if_flags & IFF_UP) &&
1176 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
1177 vh->sc_state == MASTER) {
1178 CARP_UNLOCK(cif);
1179 return (ifa);
1180 }
1181 }
1182 }
1183 CARP_UNLOCK(cif);
1184
1185 return (NULL);
1186 }
1187
1188 void *
1189 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr)
1190 {
1191 struct m_tag *mtag;
1192 struct carp_if *cif = v;
1193 struct carp_softc *sc;
1194 struct ifaddr *ifa;
1195
1196 CARP_LOCK(cif);
1197 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
1198 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1199 if (IN6_ARE_ADDR_EQUAL(taddr,
1200 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1201 (SC2IFP(sc)->if_flags & IFF_UP) &&
1202 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING)) {
1203 struct ifnet *ifp = SC2IFP(sc);
1204 mtag = m_tag_get(PACKET_TAG_CARP,
1205 sizeof(struct ifnet *), M_NOWAIT);
1206 if (mtag == NULL) {
1207 /* better a bit than nothing */
1208 CARP_UNLOCK(cif);
1209 return (IFP2ENADDR(sc->sc_ifp));
1210 }
1211 bcopy(&ifp, (caddr_t)(mtag + 1),
1212 sizeof(struct ifnet *));
1213 m_tag_prepend(m, mtag);
1214
1215 CARP_UNLOCK(cif);
1216 return (IFP2ENADDR(sc->sc_ifp));
1217 }
1218 }
1219 }
1220 CARP_UNLOCK(cif);
1221
1222 return (NULL);
1223 }
1224 #endif
1225
1226 struct ifnet *
1227 carp_forus(void *v, void *dhost)
1228 {
1229 struct carp_if *cif = v;
1230 struct carp_softc *vh;
1231 u_int8_t *ena = dhost;
1232
1233 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
1234 return (NULL);
1235
1236 CARP_LOCK(cif);
1237 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list)
1238 if ((SC2IFP(vh)->if_flags & IFF_UP) &&
1239 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
1240 vh->sc_state == MASTER &&
1241 !bcmp(dhost, IFP2ENADDR(vh->sc_ifp), ETHER_ADDR_LEN)) {
1242 CARP_UNLOCK(cif);
1243 return (SC2IFP(vh));
1244 }
1245
1246 CARP_UNLOCK(cif);
1247 return (NULL);
1248 }
1249
1250 static void
1251 carp_master_down(void *v)
1252 {
1253 struct carp_softc *sc = v;
1254
1255 CARP_SCLOCK(sc);
1256 carp_master_down_locked(sc);
1257 CARP_SCUNLOCK(sc);
1258 }
1259
1260 static void
1261 carp_master_down_locked(struct carp_softc *sc)
1262 {
1263 if (sc->sc_carpdev)
1264 CARP_SCLOCK_ASSERT(sc);
1265
1266 switch (sc->sc_state) {
1267 case INIT:
1268 printf("%s: master_down event in INIT state\n",
1269 SC2IFP(sc)->if_xname);
1270 break;
1271 case MASTER:
1272 break;
1273 case BACKUP:
1274 carp_set_state(sc, MASTER);
1275 carp_send_ad_locked(sc);
1276 carp_send_arp(sc);
1277 #ifdef INET6
1278 carp_send_na(sc);
1279 #endif /* INET6 */
1280 carp_setrun(sc, 0);
1281 carp_setroute(sc, RTM_ADD);
1282 break;
1283 }
1284 }
1285
1286 /*
1287 * When in backup state, af indicates whether to reset the master down timer
1288 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1289 */
1290 static void
1291 carp_setrun(struct carp_softc *sc, sa_family_t af)
1292 {
1293 struct timeval tv;
1294
1295 if (sc->sc_carpdev == NULL) {
1296 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1297 carp_set_state(sc, INIT);
1298 return;
1299 } else
1300 CARP_SCLOCK_ASSERT(sc);
1301
1302 if (SC2IFP(sc)->if_flags & IFF_UP &&
1303 sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6))
1304 SC2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING;
1305 else {
1306 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1307 carp_setroute(sc, RTM_DELETE);
1308 return;
1309 }
1310
1311 switch (sc->sc_state) {
1312 case INIT:
1313 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) {
1314 carp_send_ad_locked(sc);
1315 carp_send_arp(sc);
1316 #ifdef INET6
1317 carp_send_na(sc);
1318 #endif /* INET6 */
1319 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n",
1320 SC2IFP(sc)->if_xname);
1321 carp_set_state(sc, MASTER);
1322 carp_setroute(sc, RTM_ADD);
1323 } else {
1324 CARP_DEBUG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname);
1325 carp_set_state(sc, BACKUP);
1326 carp_setroute(sc, RTM_DELETE);
1327 carp_setrun(sc, 0);
1328 }
1329 break;
1330 case BACKUP:
1331 callout_stop(&sc->sc_ad_tmo);
1332 tv.tv_sec = 3 * sc->sc_advbase;
1333 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1334 switch (af) {
1335 #ifdef INET
1336 case AF_INET:
1337 callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
1338 carp_master_down, sc);
1339 break;
1340 #endif /* INET */
1341 #ifdef INET6
1342 case AF_INET6:
1343 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
1344 carp_master_down, sc);
1345 break;
1346 #endif /* INET6 */
1347 default:
1348 if (sc->sc_naddrs)
1349 callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
1350 carp_master_down, sc);
1351 if (sc->sc_naddrs6)
1352 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
1353 carp_master_down, sc);
1354 break;
1355 }
1356 break;
1357 case MASTER:
1358 tv.tv_sec = sc->sc_advbase;
1359 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1360 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1361 carp_send_ad, sc);
1362 break;
1363 }
1364 }
1365
1366 void
1367 carp_multicast_cleanup(struct carp_softc *sc)
1368 {
1369 struct ip_moptions *imo = &sc->sc_imo;
1370 #ifdef INET6
1371 struct ip6_moptions *im6o = &sc->sc_im6o;
1372 #endif
1373 u_int16_t n = imo->imo_num_memberships;
1374
1375 /* Clean up our own multicast memberships */
1376 while (n-- > 0) {
1377 if (imo->imo_membership[n] != NULL) {
1378 in_delmulti(imo->imo_membership[n]);
1379 imo->imo_membership[n] = NULL;
1380 }
1381 }
1382 imo->imo_num_memberships = 0;
1383 imo->imo_multicast_ifp = NULL;
1384
1385 #ifdef INET6
1386 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1387 struct in6_multi_mship *imm =
1388 LIST_FIRST(&im6o->im6o_memberships);
1389
1390 LIST_REMOVE(imm, i6mm_chain);
1391 in6_leavegroup(imm);
1392 }
1393 im6o->im6o_multicast_ifp = NULL;
1394 #endif
1395 }
1396
1397 static int
1398 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1399 {
1400 struct ifnet *ifp;
1401 struct carp_if *cif;
1402 struct in_ifaddr *ia, *ia_if;
1403 struct ip_moptions *imo = &sc->sc_imo;
1404 struct in_addr addr;
1405 u_long iaddr = htonl(sin->sin_addr.s_addr);
1406 int own, error;
1407
1408 if (sin->sin_addr.s_addr == 0) {
1409 if (!(SC2IFP(sc)->if_flags & IFF_UP))
1410 carp_set_state(sc, INIT);
1411 if (sc->sc_naddrs)
1412 SC2IFP(sc)->if_flags |= IFF_UP;
1413 carp_setrun(sc, 0);
1414 return (0);
1415 }
1416
1417 /* we have to do it by hands to check we won't match on us */
1418 ia_if = NULL; own = 0;
1419 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
1420 /* and, yeah, we need a multicast-capable iface too */
1421 if (ia->ia_ifp != SC2IFP(sc) &&
1422 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1423 (iaddr & ia->ia_subnetmask) == ia->ia_subnet) {
1424 if (!ia_if)
1425 ia_if = ia;
1426 if (sin->sin_addr.s_addr ==
1427 ia->ia_addr.sin_addr.s_addr)
1428 own++;
1429 }
1430 }
1431
1432 if (!ia_if)
1433 return (EADDRNOTAVAIL);
1434
1435 ia = ia_if;
1436 ifp = ia->ia_ifp;
1437
1438 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1439 (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp))
1440 return (EADDRNOTAVAIL);
1441
1442 if (imo->imo_num_memberships == 0) {
1443 addr.s_addr = htonl(INADDR_CARP_GROUP);
1444 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL)
1445 return (ENOBUFS);
1446 imo->imo_num_memberships++;
1447 imo->imo_multicast_ifp = ifp;
1448 imo->imo_multicast_ttl = CARP_DFLTTL;
1449 imo->imo_multicast_loop = 0;
1450 }
1451
1452 if (!ifp->if_carp) {
1453
1454 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP,
1455 M_WAITOK|M_ZERO);
1456 if (!cif) {
1457 error = ENOBUFS;
1458 goto cleanup;
1459 }
1460 if ((error = ifpromisc(ifp, 1))) {
1461 FREE(cif, M_CARP);
1462 goto cleanup;
1463 }
1464
1465 CARP_LOCK_INIT(cif);
1466 CARP_LOCK(cif);
1467 cif->vhif_ifp = ifp;
1468 TAILQ_INIT(&cif->vhif_vrs);
1469 ifp->if_carp = cif;
1470
1471 } else {
1472 struct carp_softc *vr;
1473
1474 cif = (struct carp_if *)ifp->if_carp;
1475 CARP_LOCK(cif);
1476 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1477 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1478 CARP_UNLOCK(cif);
1479 error = EINVAL;
1480 goto cleanup;
1481 }
1482 }
1483 sc->sc_ia = ia;
1484 sc->sc_carpdev = ifp;
1485
1486 { /* XXX prevent endless loop if already in queue */
1487 struct carp_softc *vr, *after = NULL;
1488 int myself = 0;
1489 cif = (struct carp_if *)ifp->if_carp;
1490
1491 /* XXX: cif should not change, right? So we still hold the lock */
1492 CARP_LOCK_ASSERT(cif);
1493
1494 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1495 if (vr == sc)
1496 myself = 1;
1497 if (vr->sc_vhid < sc->sc_vhid)
1498 after = vr;
1499 }
1500
1501 if (!myself) {
1502 /* We're trying to keep things in order */
1503 if (after == NULL) {
1504 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1505 } else {
1506 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1507 }
1508 cif->vhif_nvrs++;
1509 }
1510 }
1511
1512 sc->sc_naddrs++;
1513 SC2IFP(sc)->if_flags |= IFF_UP;
1514 if (own)
1515 sc->sc_advskew = 0;
1516 carp_sc_state_locked(sc);
1517 carp_setrun(sc, 0);
1518
1519 CARP_UNLOCK(cif);
1520
1521 return (0);
1522
1523 cleanup:
1524 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1525 return (error);
1526 }
1527
1528 static int
1529 carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1530 {
1531 int error = 0;
1532
1533 if (!--sc->sc_naddrs) {
1534 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1535 struct ip_moptions *imo = &sc->sc_imo;
1536
1537 CARP_LOCK(cif);
1538 callout_stop(&sc->sc_ad_tmo);
1539 SC2IFP(sc)->if_flags &= ~IFF_UP;
1540 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1541 sc->sc_vhid = -1;
1542 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1543 imo->imo_multicast_ifp = NULL;
1544 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1545 if (!--cif->vhif_nvrs) {
1546 sc->sc_carpdev->if_carp = NULL;
1547 CARP_LOCK_DESTROY(cif);
1548 FREE(cif, M_IFADDR);
1549 } else {
1550 CARP_UNLOCK(cif);
1551 }
1552 }
1553
1554 return (error);
1555 }
1556
1557 #ifdef INET6
1558 static int
1559 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1560 {
1561 struct ifnet *ifp;
1562 struct carp_if *cif;
1563 struct in6_ifaddr *ia, *ia_if;
1564 struct ip6_moptions *im6o = &sc->sc_im6o;
1565 struct in6_multi_mship *imm;
1566 struct in6_addr in6;
1567 int own, error;
1568
1569 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1570 if (!(SC2IFP(sc)->if_flags & IFF_UP))
1571 carp_set_state(sc, INIT);
1572 if (sc->sc_naddrs6)
1573 SC2IFP(sc)->if_flags |= IFF_UP;
1574 carp_setrun(sc, 0);
1575 return (0);
1576 }
1577
1578 /* we have to do it by hands to check we won't match on us */
1579 ia_if = NULL; own = 0;
1580 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1581 int i;
1582
1583 for (i = 0; i < 4; i++) {
1584 if ((sin6->sin6_addr.s6_addr32[i] &
1585 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
1586 (ia->ia_addr.sin6_addr.s6_addr32[i] &
1587 ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
1588 break;
1589 }
1590 /* and, yeah, we need a multicast-capable iface too */
1591 if (ia->ia_ifp != SC2IFP(sc) &&
1592 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1593 (i == 4)) {
1594 if (!ia_if)
1595 ia_if = ia;
1596 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
1597 &ia->ia_addr.sin6_addr))
1598 own++;
1599 }
1600 }
1601
1602 if (!ia_if)
1603 return (EADDRNOTAVAIL);
1604 ia = ia_if;
1605 ifp = ia->ia_ifp;
1606
1607 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1608 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp))
1609 return (EADDRNOTAVAIL);
1610
1611 if (!sc->sc_naddrs6) {
1612 im6o->im6o_multicast_ifp = ifp;
1613
1614 /* join CARP multicast address */
1615 bzero(&in6, sizeof(in6));
1616 in6.s6_addr16[0] = htons(0xff02);
1617 in6.s6_addr8[15] = 0x12;
1618 if (in6_setscope(&in6, ifp, NULL) != 0)
1619 goto cleanup;
1620 if ((imm = in6_joingroup(ifp, &in6, &error, 0)) == NULL)
1621 goto cleanup;
1622 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1623
1624 /* join solicited multicast address */
1625 bzero(&in6, sizeof(in6));
1626 in6.s6_addr16[0] = htons(0xff02);
1627 in6.s6_addr32[1] = 0;
1628 in6.s6_addr32[2] = htonl(1);
1629 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3];
1630 in6.s6_addr8[12] = 0xff;
1631 if (in6_setscope(&in6, ifp, NULL) != 0)
1632 goto cleanup;
1633 if ((imm = in6_joingroup(ifp, &in6, &error, 0)) == NULL)
1634 goto cleanup;
1635 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1636 }
1637
1638 if (!ifp->if_carp) {
1639 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP,
1640 M_WAITOK|M_ZERO);
1641 if (!cif) {
1642 error = ENOBUFS;
1643 goto cleanup;
1644 }
1645 if ((error = ifpromisc(ifp, 1))) {
1646 FREE(cif, M_CARP);
1647 goto cleanup;
1648 }
1649
1650 CARP_LOCK_INIT(cif);
1651 CARP_LOCK(cif);
1652 cif->vhif_ifp = ifp;
1653 TAILQ_INIT(&cif->vhif_vrs);
1654 ifp->if_carp = cif;
1655
1656 } else {
1657 struct carp_softc *vr;
1658
1659 cif = (struct carp_if *)ifp->if_carp;
1660 CARP_LOCK(cif);
1661 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1662 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1663 CARP_UNLOCK(cif);
1664 error = EINVAL;
1665 goto cleanup;
1666 }
1667 }
1668 sc->sc_ia6 = ia;
1669 sc->sc_carpdev = ifp;
1670
1671 { /* XXX prevent endless loop if already in queue */
1672 struct carp_softc *vr, *after = NULL;
1673 int myself = 0;
1674 cif = (struct carp_if *)ifp->if_carp;
1675 CARP_LOCK_ASSERT(cif);
1676
1677 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1678 if (vr == sc)
1679 myself = 1;
1680 if (vr->sc_vhid < sc->sc_vhid)
1681 after = vr;
1682 }
1683
1684 if (!myself) {
1685 /* We're trying to keep things in order */
1686 if (after == NULL) {
1687 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1688 } else {
1689 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1690 }
1691 cif->vhif_nvrs++;
1692 }
1693 }
1694
1695 sc->sc_naddrs6++;
1696 SC2IFP(sc)->if_flags |= IFF_UP;
1697 if (own)
1698 sc->sc_advskew = 0;
1699 carp_sc_state_locked(sc);
1700 carp_setrun(sc, 0);
1701
1702 CARP_UNLOCK(cif);
1703
1704 return (0);
1705
1706 cleanup:
1707 /* clean up multicast memberships */
1708 if (!sc->sc_naddrs6) {
1709 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1710 imm = LIST_FIRST(&im6o->im6o_memberships);
1711 LIST_REMOVE(imm, i6mm_chain);
1712 in6_leavegroup(imm);
1713 }
1714 }
1715 return (error);
1716 }
1717
1718 static int
1719 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1720 {
1721 int error = 0;
1722
1723 if (!--sc->sc_naddrs6) {
1724 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1725 struct ip6_moptions *im6o = &sc->sc_im6o;
1726
1727 CARP_LOCK(cif);
1728 callout_stop(&sc->sc_ad_tmo);
1729 SC2IFP(sc)->if_flags &= ~IFF_UP;
1730 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1731 sc->sc_vhid = -1;
1732 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1733 struct in6_multi_mship *imm =
1734 LIST_FIRST(&im6o->im6o_memberships);
1735
1736 LIST_REMOVE(imm, i6mm_chain);
1737 in6_leavegroup(imm);
1738 }
1739 im6o->im6o_multicast_ifp = NULL;
1740 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1741 if (!--cif->vhif_nvrs) {
1742 CARP_LOCK_DESTROY(cif);
1743 sc->sc_carpdev->if_carp = NULL;
1744 FREE(cif, M_IFADDR);
1745 } else
1746 CARP_UNLOCK(cif);
1747 }
1748
1749 return (error);
1750 }
1751 #endif /* INET6 */
1752
1753 static int
1754 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr)
1755 {
1756 struct carp_softc *sc = ifp->if_softc, *vr;
1757 struct carpreq carpr;
1758 struct ifaddr *ifa;
1759 struct ifreq *ifr;
1760 struct ifaliasreq *ifra;
1761 int locked = 0, error = 0;
1762
1763 ifa = (struct ifaddr *)addr;
1764 ifra = (struct ifaliasreq *)addr;
1765 ifr = (struct ifreq *)addr;
1766
1767 switch (cmd) {
1768 case SIOCSIFADDR:
1769 switch (ifa->ifa_addr->sa_family) {
1770 #ifdef INET
1771 case AF_INET:
1772 SC2IFP(sc)->if_flags |= IFF_UP;
1773 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1774 sizeof(struct sockaddr));
1775 error = carp_set_addr(sc, satosin(ifa->ifa_addr));
1776 break;
1777 #endif /* INET */
1778 #ifdef INET6
1779 case AF_INET6:
1780 SC2IFP(sc)->if_flags |= IFF_UP;
1781 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr));
1782 break;
1783 #endif /* INET6 */
1784 default:
1785 error = EAFNOSUPPORT;
1786 break;
1787 }
1788 break;
1789
1790 case SIOCAIFADDR:
1791 switch (ifa->ifa_addr->sa_family) {
1792 #ifdef INET
1793 case AF_INET:
1794 SC2IFP(sc)->if_flags |= IFF_UP;
1795 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1796 sizeof(struct sockaddr));
1797 error = carp_set_addr(sc, satosin(&ifra->ifra_addr));
1798 break;
1799 #endif /* INET */
1800 #ifdef INET6
1801 case AF_INET6:
1802 SC2IFP(sc)->if_flags |= IFF_UP;
1803 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr));
1804 break;
1805 #endif /* INET6 */
1806 default:
1807 error = EAFNOSUPPORT;
1808 break;
1809 }
1810 break;
1811
1812 case SIOCDIFADDR:
1813 switch (ifa->ifa_addr->sa_family) {
1814 #ifdef INET
1815 case AF_INET:
1816 error = carp_del_addr(sc, satosin(&ifra->ifra_addr));
1817 break;
1818 #endif /* INET */
1819 #ifdef INET6
1820 case AF_INET6:
1821 error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr));
1822 break;
1823 #endif /* INET6 */
1824 default:
1825 error = EAFNOSUPPORT;
1826 break;
1827 }
1828 break;
1829
1830 case SIOCSIFFLAGS:
1831 if (sc->sc_carpdev) {
1832 locked = 1;
1833 CARP_SCLOCK(sc);
1834 }
1835 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) {
1836 callout_stop(&sc->sc_ad_tmo);
1837 callout_stop(&sc->sc_md_tmo);
1838 callout_stop(&sc->sc_md6_tmo);
1839 if (sc->sc_state == MASTER)
1840 carp_send_ad_locked(sc);
1841 carp_set_state(sc, INIT);
1842 carp_setrun(sc, 0);
1843 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) {
1844 SC2IFP(sc)->if_flags |= IFF_UP;
1845 carp_setrun(sc, 0);
1846 }
1847 break;
1848
1849 case SIOCSVH:
1850 if ((error = suser(curthread)) != 0)
1851 break;
1852 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr)))
1853 break;
1854 error = 1;
1855 if (sc->sc_carpdev) {
1856 locked = 1;
1857 CARP_SCLOCK(sc);
1858 }
1859 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) {
1860 switch (carpr.carpr_state) {
1861 case BACKUP:
1862 callout_stop(&sc->sc_ad_tmo);
1863 carp_set_state(sc, BACKUP);
1864 carp_setrun(sc, 0);
1865 carp_setroute(sc, RTM_DELETE);
1866 break;
1867 case MASTER:
1868 carp_master_down_locked(sc);
1869 break;
1870 default:
1871 break;
1872 }
1873 }
1874 if (carpr.carpr_vhid > 0) {
1875 if (carpr.carpr_vhid > 255) {
1876 error = EINVAL;
1877 break;
1878 }
1879 if (sc->sc_carpdev) {
1880 struct carp_if *cif;
1881 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1882 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1883 if (vr != sc &&
1884 vr->sc_vhid == carpr.carpr_vhid) {
1885 error = EEXIST;
1886 break;
1887 }
1888 if (error == EEXIST)
1889 break;
1890 }
1891 sc->sc_vhid = carpr.carpr_vhid;
1892 IFP2ENADDR(sc->sc_ifp)[0] = 0;
1893 IFP2ENADDR(sc->sc_ifp)[1] = 0;
1894 IFP2ENADDR(sc->sc_ifp)[2] = 0x5e;
1895 IFP2ENADDR(sc->sc_ifp)[3] = 0;
1896 IFP2ENADDR(sc->sc_ifp)[4] = 1;
1897 IFP2ENADDR(sc->sc_ifp)[5] = sc->sc_vhid;
1898 error--;
1899 }
1900 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) {
1901 if (carpr.carpr_advskew >= 255) {
1902 error = EINVAL;
1903 break;
1904 }
1905 if (carpr.carpr_advbase > 255) {
1906 error = EINVAL;
1907 break;
1908 }
1909 sc->sc_advbase = carpr.carpr_advbase;
1910 sc->sc_advskew = carpr.carpr_advskew;
1911 error--;
1912 }
1913 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key));
1914 if (error > 0)
1915 error = EINVAL;
1916 else {
1917 error = 0;
1918 carp_setrun(sc, 0);
1919 }
1920 break;
1921
1922 case SIOCGVH:
1923 /* XXX: lockless read */
1924 bzero(&carpr, sizeof(carpr));
1925 carpr.carpr_state = sc->sc_state;
1926 carpr.carpr_vhid = sc->sc_vhid;
1927 carpr.carpr_advbase = sc->sc_advbase;
1928 carpr.carpr_advskew = sc->sc_advskew;
1929 if (suser(curthread) == 0)
1930 bcopy(sc->sc_key, carpr.carpr_key,
1931 sizeof(carpr.carpr_key));
1932 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
1933 break;
1934
1935 default:
1936 error = EINVAL;
1937 }
1938
1939 if (locked)
1940 CARP_SCUNLOCK(sc);
1941
1942 carp_hmac_prepare(sc);
1943
1944 return (error);
1945 }
1946
1947 /*
1948 * XXX: this is looutput. We should eventually use it from there.
1949 */
1950 static int
1951 carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
1952 struct rtentry *rt)
1953 {
1954 u_int32_t af;
1955
1956 M_ASSERTPKTHDR(m); /* check if we have the packet header */
1957
1958 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
1959 m_freem(m);
1960 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
1961 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
1962 }
1963
1964 ifp->if_opackets++;
1965 ifp->if_obytes += m->m_pkthdr.len;
1966
1967 /* BPF writes need to be handled specially. */
1968 if (dst->sa_family == AF_UNSPEC) {
1969 bcopy(dst->sa_data, &af, sizeof(af));
1970 dst->sa_family = af;
1971 }
1972
1973 #if 1 /* XXX */
1974 switch (dst->sa_family) {
1975 case AF_INET:
1976 case AF_INET6:
1977 case AF_IPX:
1978 case AF_APPLETALK:
1979 break;
1980 default:
1981 printf("carp_looutput: af=%d unexpected\n", dst->sa_family);
1982 m_freem(m);
1983 return (EAFNOSUPPORT);
1984 }
1985 #endif
1986 return(if_simloop(ifp, m, dst->sa_family, 0));
1987 }
1988
1989 /*
1990 * Start output on carp interface. This function should never be called.
1991 */
1992 static void
1993 carp_start(struct ifnet *ifp)
1994 {
1995 #ifdef DEBUG
1996 printf("%s: start called\n", ifp->if_xname);
1997 #endif
1998 }
1999
2000 int
2001 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
2002 struct rtentry *rt)
2003 {
2004 struct m_tag *mtag;
2005 struct carp_softc *sc;
2006 struct ifnet *carp_ifp;
2007
2008 if (!sa)
2009 return (0);
2010
2011 switch (sa->sa_family) {
2012 #ifdef INET
2013 case AF_INET:
2014 break;
2015 #endif /* INET */
2016 #ifdef INET6
2017 case AF_INET6:
2018 break;
2019 #endif /* INET6 */
2020 default:
2021 return (0);
2022 }
2023
2024 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL);
2025 if (mtag == NULL)
2026 return (0);
2027
2028 bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *));
2029 sc = carp_ifp->if_softc;
2030
2031 /* Set the source MAC address to Virtual Router MAC Address */
2032 switch (ifp->if_type) {
2033 case IFT_ETHER:
2034 case IFT_L2VLAN: {
2035 struct ether_header *eh;
2036
2037 eh = mtod(m, struct ether_header *);
2038 eh->ether_shost[0] = 0;
2039 eh->ether_shost[1] = 0;
2040 eh->ether_shost[2] = 0x5e;
2041 eh->ether_shost[3] = 0;
2042 eh->ether_shost[4] = 1;
2043 eh->ether_shost[5] = sc->sc_vhid;
2044 }
2045 break;
2046 case IFT_FDDI: {
2047 struct fddi_header *fh;
2048
2049 fh = mtod(m, struct fddi_header *);
2050 fh->fddi_shost[0] = 0;
2051 fh->fddi_shost[1] = 0;
2052 fh->fddi_shost[2] = 0x5e;
2053 fh->fddi_shost[3] = 0;
2054 fh->fddi_shost[4] = 1;
2055 fh->fddi_shost[5] = sc->sc_vhid;
2056 }
2057 break;
2058 case IFT_ISO88025: {
2059 struct iso88025_header *th;
2060 th = mtod(m, struct iso88025_header *);
2061 th->iso88025_shost[0] = 3;
2062 th->iso88025_shost[1] = 0;
2063 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1);
2064 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1);
2065 th->iso88025_shost[4] = 0;
2066 th->iso88025_shost[5] = 0;
2067 }
2068 break;
2069 default:
2070 printf("%s: carp is not supported for this interface type\n",
2071 ifp->if_xname);
2072 return (EOPNOTSUPP);
2073 }
2074
2075 return (0);
2076 }
2077
2078 static void
2079 carp_set_state(struct carp_softc *sc, int state)
2080 {
2081
2082 if (sc->sc_carpdev)
2083 CARP_SCLOCK_ASSERT(sc);
2084
2085 if (sc->sc_state == state)
2086 return;
2087
2088 sc->sc_state = state;
2089 switch (state) {
2090 case BACKUP:
2091 SC2IFP(sc)->if_link_state = LINK_STATE_DOWN;
2092 break;
2093 case MASTER:
2094 SC2IFP(sc)->if_link_state = LINK_STATE_UP;
2095 break;
2096 default:
2097 SC2IFP(sc)->if_link_state = LINK_STATE_UNKNOWN;
2098 break;
2099 }
2100 rt_ifmsg(SC2IFP(sc));
2101 }
2102
2103 void
2104 carp_carpdev_state(void *v)
2105 {
2106 struct carp_if *cif = v;
2107
2108 CARP_LOCK(cif);
2109 carp_carpdev_state_locked(cif);
2110 CARP_UNLOCK(cif);
2111 }
2112
2113 static void
2114 carp_carpdev_state_locked(struct carp_if *cif)
2115 {
2116 struct carp_softc *sc;
2117
2118 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
2119 carp_sc_state_locked(sc);
2120 }
2121
2122 static void
2123 carp_sc_state_locked(struct carp_softc *sc)
2124 {
2125 CARP_SCLOCK_ASSERT(sc);
2126
2127 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP ||
2128 !(sc->sc_carpdev->if_flags & IFF_UP)) {
2129 sc->sc_flags_backup = SC2IFP(sc)->if_flags;
2130 SC2IFP(sc)->if_flags &= ~IFF_UP;
2131 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
2132 callout_stop(&sc->sc_ad_tmo);
2133 callout_stop(&sc->sc_md_tmo);
2134 callout_stop(&sc->sc_md6_tmo);
2135 carp_set_state(sc, INIT);
2136 carp_setrun(sc, 0);
2137 if (!sc->sc_suppress) {
2138 carp_suppress_preempt++;
2139 if (carp_suppress_preempt == 1) {
2140 CARP_SCUNLOCK(sc);
2141 carp_send_ad_all();
2142 CARP_SCLOCK(sc);
2143 }
2144 }
2145 sc->sc_suppress = 1;
2146 } else {
2147 SC2IFP(sc)->if_flags |= sc->sc_flags_backup;
2148 carp_set_state(sc, INIT);
2149 carp_setrun(sc, 0);
2150 if (sc->sc_suppress)
2151 carp_suppress_preempt--;
2152 sc->sc_suppress = 0;
2153 }
2154
2155 return;
2156 }
2157
2158 static int
2159 carp_modevent(module_t mod, int type, void *data)
2160 {
2161 switch (type) {
2162 case MOD_LOAD:
2163 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
2164 carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY);
2165 if (if_detach_event_tag == NULL)
2166 return (ENOMEM);
2167 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF);
2168 LIST_INIT(&carpif_list);
2169 if_clone_attach(&carp_cloner);
2170 break;
2171
2172 case MOD_UNLOAD:
2173 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag);
2174 if_clone_detach(&carp_cloner);
2175 while (!LIST_EMPTY(&carpif_list))
2176 carp_clone_destroy(SC2IFP(LIST_FIRST(&carpif_list)));
2177 mtx_destroy(&carp_mtx);
2178 break;
2179
2180 default:
2181 return (EINVAL);
2182 }
2183
2184 return (0);
2185 }
2186
2187 static moduledata_t carp_mod = {
2188 "carp",
2189 carp_modevent,
2190 0
2191 };
2192
2193 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
Cache object: 2ae835ebcf55580278308c408a0c7c2d
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