FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_carp.c
1 /* $NetBSD: ip_carp.c,v 1.10 2006/11/16 01:33:45 christos Exp $ */
2 /* $OpenBSD: ip_carp.c,v 1.113 2005/11/04 08:11:54 mcbride Exp $ */
3
4 /*
5 * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
6 * Copyright (c) 2003 Ryan McBride. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
26 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
27 * THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 /*
31 * TODO:
32 * - iface reconfigure
33 * - support for hardware checksum calculations;
34 *
35 */
36
37 #include <sys/param.h>
38 #include <sys/proc.h>
39 #include <sys/mbuf.h>
40 #include <sys/socket.h>
41 #include <sys/socketvar.h>
42 #include <sys/callout.h>
43 #include <sys/ioctl.h>
44 #include <sys/errno.h>
45 #include <sys/device.h>
46 #include <sys/time.h>
47 #include <sys/kernel.h>
48 #include <sys/kauth.h>
49 #include <sys/sysctl.h>
50 #include <sys/ucred.h>
51 #include <sys/syslog.h>
52 #include <sys/acct.h>
53
54 #include <machine/cpu.h>
55
56 #include <net/if.h>
57 #include <net/pfil.h>
58 #include <net/if_types.h>
59 #include <net/if_ether.h>
60 #include <net/route.h>
61 #include <net/netisr.h>
62 #include <netinet/if_inarp.h>
63
64 #include <machine/stdarg.h>
65
66 #if NFDDI > 0
67 #include <net/if_fddi.h>
68 #endif
69 #if NTOKEN > 0
70 #include <net/if_token.h>
71 #endif
72
73 #ifdef INET
74 #include <netinet/in.h>
75 #include <netinet/in_systm.h>
76 #include <netinet/in_var.h>
77 #include <netinet/ip.h>
78 #include <netinet/ip_var.h>
79
80 #include <net/if_dl.h>
81 #endif
82
83 #ifdef INET6
84 #include <netinet/icmp6.h>
85 #include <netinet/ip6.h>
86 #include <netinet6/ip6_var.h>
87 #include <netinet6/nd6.h>
88 #endif
89
90 #include "bpfilter.h"
91 #if NBPFILTER > 0
92 #include <net/bpf.h>
93 #endif
94
95 #include <sys/sha1.h>
96
97 #include <netinet/ip_carp.h>
98
99 struct carp_mc_entry {
100 LIST_ENTRY(carp_mc_entry) mc_entries;
101 union {
102 struct ether_multi *mcu_enm;
103 } mc_u;
104 struct sockaddr_storage mc_addr;
105 };
106 #define mc_enm mc_u.mcu_enm
107
108 struct carp_softc {
109 struct ethercom sc_ac;
110 #define sc_if sc_ac.ec_if
111 #define sc_carpdev sc_ac.ec_if.if_carpdev
112 int ah_cookie;
113 int lh_cookie;
114 struct ip_moptions sc_imo;
115 #ifdef INET6
116 struct ip6_moptions sc_im6o;
117 #endif /* INET6 */
118 TAILQ_ENTRY(carp_softc) sc_list;
119
120 enum { INIT = 0, BACKUP, MASTER } sc_state;
121
122 int sc_suppress;
123 int sc_bow_out;
124
125 int sc_sendad_errors;
126 #define CARP_SENDAD_MAX_ERRORS 3
127 int sc_sendad_success;
128 #define CARP_SENDAD_MIN_SUCCESS 3
129
130 int sc_vhid;
131 int sc_advskew;
132 int sc_naddrs;
133 int sc_naddrs6;
134 int sc_advbase; /* seconds */
135 int sc_init_counter;
136 u_int64_t sc_counter;
137
138 /* authentication */
139 #define CARP_HMAC_PAD 64
140 unsigned char sc_key[CARP_KEY_LEN];
141 unsigned char sc_pad[CARP_HMAC_PAD];
142 SHA1_CTX sc_sha1;
143 u_int32_t sc_hashkey[2];
144
145 struct callout sc_ad_tmo; /* advertisement timeout */
146 struct callout sc_md_tmo; /* master down timeout */
147 struct callout sc_md6_tmo; /* master down timeout */
148
149 LIST_HEAD(__carp_mchead, carp_mc_entry) carp_mc_listhead;
150 };
151
152 int carp_suppress_preempt = 0;
153 int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 0, 0 }; /* XXX for now */
154 struct carpstats carpstats;
155
156 struct carp_if {
157 TAILQ_HEAD(, carp_softc) vhif_vrs;
158 int vhif_nvrs;
159
160 struct ifnet *vhif_ifp;
161 };
162
163 #define CARP_LOG(sc, s) \
164 if (carp_opts[CARPCTL_LOG]) { \
165 if (sc) \
166 log(LOG_INFO, "%s: ", \
167 (sc)->sc_if.if_xname); \
168 else \
169 log(LOG_INFO, "carp: "); \
170 addlog s; \
171 addlog("\n"); \
172 }
173
174 void carp_hmac_prepare(struct carp_softc *);
175 void carp_hmac_generate(struct carp_softc *, u_int32_t *,
176 unsigned char *);
177 int carp_hmac_verify(struct carp_softc *, u_int32_t *,
178 unsigned char *);
179 void carp_setroute(struct carp_softc *, int);
180 void carp_proto_input_c(struct mbuf *, struct carp_header *, sa_family_t);
181 void carpattach(int);
182 void carpdetach(struct carp_softc *);
183 int carp_prepare_ad(struct mbuf *, struct carp_softc *,
184 struct carp_header *);
185 void carp_send_ad_all(void);
186 void carp_send_ad(void *);
187 void carp_send_arp(struct carp_softc *);
188 void carp_master_down(void *);
189 int carp_ioctl(struct ifnet *, u_long, caddr_t);
190 void carp_start(struct ifnet *);
191 void carp_setrun(struct carp_softc *, sa_family_t);
192 void carp_set_state(struct carp_softc *, int);
193 int carp_addrcount(struct carp_if *, struct in_ifaddr *, int);
194 enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING };
195
196 void carp_multicast_cleanup(struct carp_softc *);
197 int carp_set_ifp(struct carp_softc *, struct ifnet *);
198 void carp_set_enaddr(struct carp_softc *);
199 void carp_addr_updated(void *);
200 u_int32_t carp_hash(struct carp_softc *, u_char *);
201 int carp_set_addr(struct carp_softc *, struct sockaddr_in *);
202 int carp_join_multicast(struct carp_softc *);
203 #ifdef INET6
204 void carp_send_na(struct carp_softc *);
205 int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *);
206 int carp_join_multicast6(struct carp_softc *);
207 #endif
208 int carp_clone_create(struct if_clone *, int);
209 int carp_clone_destroy(struct ifnet *);
210 int carp_ether_addmulti(struct carp_softc *, struct ifreq *);
211 int carp_ether_delmulti(struct carp_softc *, struct ifreq *);
212 void carp_ether_purgemulti(struct carp_softc *);
213
214 struct if_clone carp_cloner =
215 IF_CLONE_INITIALIZER("carp", carp_clone_create, carp_clone_destroy);
216
217 static __inline u_int16_t
218 carp_cksum(struct mbuf *m, int len)
219 {
220 return (in_cksum(m, len));
221 }
222
223 void
224 carp_hmac_prepare(struct carp_softc *sc)
225 {
226 u_int8_t carp_version = CARP_VERSION, type = CARP_ADVERTISEMENT;
227 u_int8_t vhid = sc->sc_vhid & 0xff;
228 SHA1_CTX sha1ctx;
229 u_int32_t kmd[5];
230 struct ifaddr *ifa;
231 int i, found;
232 struct in_addr last, cur, in;
233 #ifdef INET6
234 struct in6_addr last6, cur6, in6;
235 #endif /* INET6 */
236
237 /* compute ipad from key */
238 bzero(sc->sc_pad, sizeof(sc->sc_pad));
239 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
240 for (i = 0; i < sizeof(sc->sc_pad); i++)
241 sc->sc_pad[i] ^= 0x36;
242
243 /* precompute first part of inner hash */
244 SHA1Init(&sc->sc_sha1);
245 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
246 SHA1Update(&sc->sc_sha1, (void *)&carp_version, sizeof(carp_version));
247 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
248
249 /* generate a key for the arpbalance hash, before the vhid is hashed */
250 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
251 SHA1Final((unsigned char *)kmd, &sha1ctx);
252 sc->sc_hashkey[0] = kmd[0] ^ kmd[1];
253 sc->sc_hashkey[1] = kmd[2] ^ kmd[3];
254
255 /* the rest of the precomputation */
256 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
257
258 /* Hash the addresses from smallest to largest, not interface order */
259 #ifdef INET
260 cur.s_addr = 0;
261 do {
262 found = 0;
263 last = cur;
264 cur.s_addr = 0xffffffff;
265 TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) {
266 in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr;
267 if (ifa->ifa_addr->sa_family == AF_INET &&
268 ntohl(in.s_addr) > ntohl(last.s_addr) &&
269 ntohl(in.s_addr) < ntohl(cur.s_addr)) {
270 cur.s_addr = in.s_addr;
271 found++;
272 }
273 }
274 if (found)
275 SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur));
276 } while (found);
277 #endif /* INET */
278
279 #ifdef INET6
280 memset(&cur6, 0x00, sizeof(cur6));
281 do {
282 found = 0;
283 last6 = cur6;
284 memset(&cur6, 0xff, sizeof(cur6));
285 TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) {
286 in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
287 if (IN6_IS_ADDR_LINKLOCAL(&in6))
288 in6.s6_addr16[1] = 0;
289 if (ifa->ifa_addr->sa_family == AF_INET6 &&
290 memcmp(&in6, &last6, sizeof(in6)) > 0 &&
291 memcmp(&in6, &cur6, sizeof(in6)) < 0) {
292 cur6 = in6;
293 found++;
294 }
295 }
296 if (found)
297 SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6));
298 } while (found);
299 #endif /* INET6 */
300
301 /* convert ipad to opad */
302 for (i = 0; i < sizeof(sc->sc_pad); i++)
303 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
304 }
305
306 void
307 carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2],
308 unsigned char md[20])
309 {
310 SHA1_CTX sha1ctx;
311
312 /* fetch first half of inner hash */
313 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
314
315 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
316 SHA1Final(md, &sha1ctx);
317
318 /* outer hash */
319 SHA1Init(&sha1ctx);
320 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
321 SHA1Update(&sha1ctx, md, 20);
322 SHA1Final(md, &sha1ctx);
323 }
324
325 int
326 carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2],
327 unsigned char md[20])
328 {
329 unsigned char md2[20];
330
331 carp_hmac_generate(sc, counter, md2);
332
333 return (bcmp(md, md2, sizeof(md2)));
334 }
335
336 void
337 carp_setroute(struct carp_softc *sc, int cmd)
338 {
339 struct ifaddr *ifa;
340 int s;
341
342 s = splsoftnet();
343 TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) {
344 switch (ifa->ifa_addr->sa_family) {
345 case AF_INET: {
346 int count = 0;
347 struct sockaddr sa;
348 struct rtentry *rt;
349 struct radix_node_head *rnh =
350 rt_tables[ifa->ifa_addr->sa_family];
351 struct radix_node *rn;
352 int hr_otherif, nr_ourif;
353
354 /*
355 * Avoid screwing with the routes if there are other
356 * carp interfaces which are master and have the same
357 * address.
358 */
359 if (sc->sc_carpdev != NULL &&
360 sc->sc_carpdev->if_carp != NULL) {
361 count = carp_addrcount(
362 (struct carp_if *)sc->sc_carpdev->if_carp,
363 ifatoia(ifa), CARP_COUNT_MASTER);
364 if ((cmd == RTM_ADD && count != 1) ||
365 (cmd == RTM_DELETE && count != 0))
366 continue;
367 }
368
369 /* Remove the existing host route, if any */
370 rtrequest(RTM_DELETE, ifa->ifa_addr,
371 ifa->ifa_addr, ifa->ifa_netmask,
372 RTF_HOST, NULL);
373
374 /* Check for our address on another interface */
375 rn = rnh->rnh_matchaddr(ifa->ifa_addr, rnh);
376 rt = (struct rtentry *)rn;
377 hr_otherif = (rt && rt->rt_ifp != &sc->sc_if &&
378 rt->rt_flags & (RTF_CLONING|RTF_CLONED));
379
380 /* Check for a network route on our interface */
381 bcopy(ifa->ifa_addr, &sa, sizeof(sa));
382 satosin(&sa)->sin_addr.s_addr = satosin(ifa->ifa_netmask
383 )->sin_addr.s_addr & satosin(&sa)->sin_addr.s_addr;
384 rn = rnh->rnh_lookup(&sa, ifa->ifa_netmask, rnh);
385 rt = (struct rtentry *)rn;
386 nr_ourif = (rt && rt->rt_ifp == &sc->sc_if);
387
388 switch (cmd) {
389 case RTM_ADD:
390 if (hr_otherif) {
391 ifa->ifa_rtrequest = NULL;
392 ifa->ifa_flags &= ~RTF_CLONING;
393
394 rtrequest(RTM_ADD, ifa->ifa_addr,
395 ifa->ifa_addr, ifa->ifa_netmask,
396 RTF_UP | RTF_HOST, NULL);
397 }
398 if (!hr_otherif || nr_ourif || !rt) {
399 if (nr_ourif && !(rt->rt_flags &
400 RTF_CLONING))
401 rtrequest(RTM_DELETE, &sa,
402 ifa->ifa_addr,
403 ifa->ifa_netmask, 0, NULL);
404
405 ifa->ifa_rtrequest = arp_rtrequest;
406 ifa->ifa_flags |= RTF_CLONING;
407
408 if (rtrequest(RTM_ADD, ifa->ifa_addr,
409 ifa->ifa_addr, ifa->ifa_netmask, 0,
410 NULL) == 0)
411 ifa->ifa_flags |= IFA_ROUTE;
412 }
413 break;
414 case RTM_DELETE:
415 break;
416 default:
417 break;
418 }
419 break;
420 }
421
422 #ifdef INET6
423 case AF_INET6:
424 if (cmd == RTM_ADD)
425 in6_ifaddloop(ifa);
426 else
427 in6_ifremloop(ifa);
428 break;
429 #endif /* INET6 */
430 default:
431 break;
432 }
433 }
434 splx(s);
435 }
436
437 /*
438 * process input packet.
439 * we have rearranged checks order compared to the rfc,
440 * but it seems more efficient this way or not possible otherwise.
441 */
442 void
443 carp_proto_input(struct mbuf *m, ...)
444 {
445 struct ip *ip = mtod(m, struct ip *);
446 struct carp_softc *sc = NULL;
447 struct carp_header *ch;
448 int iplen, len, hlen;
449 va_list ap;
450
451 va_start(ap, m);
452 hlen = va_arg(ap, int);
453 va_end(ap);
454
455 carpstats.carps_ipackets++;
456
457 if (!carp_opts[CARPCTL_ALLOW]) {
458 m_freem(m);
459 return;
460 }
461
462 /* check if received on a valid carp interface */
463 if (m->m_pkthdr.rcvif->if_type != IFT_CARP) {
464 carpstats.carps_badif++;
465 CARP_LOG(sc, ("packet received on non-carp interface: %s",
466 m->m_pkthdr.rcvif->if_xname));
467 m_freem(m);
468 return;
469 }
470
471 /* verify that the IP TTL is 255. */
472 if (ip->ip_ttl != CARP_DFLTTL) {
473 carpstats.carps_badttl++;
474 CARP_LOG(sc, ("received ttl %d != %d on %s", ip->ip_ttl,
475 CARP_DFLTTL, m->m_pkthdr.rcvif->if_xname));
476 m_freem(m);
477 return;
478 }
479
480 /*
481 * verify that the received packet length is
482 * equal to the CARP header
483 */
484 iplen = ip->ip_hl << 2;
485 len = iplen + sizeof(*ch);
486 if (len > m->m_pkthdr.len) {
487 carpstats.carps_badlen++;
488 CARP_LOG(sc, ("packet too short %d on %s", m->m_pkthdr.len,
489 m->m_pkthdr.rcvif->if_xname));
490 m_freem(m);
491 return;
492 }
493
494 if ((m = m_pullup(m, len)) == NULL) {
495 carpstats.carps_hdrops++;
496 return;
497 }
498 ip = mtod(m, struct ip *);
499 ch = (struct carp_header *)((char *)ip + iplen);
500 /* verify the CARP checksum */
501 m->m_data += iplen;
502 if (carp_cksum(m, len - iplen)) {
503 carpstats.carps_badsum++;
504 CARP_LOG(sc, ("checksum failed on %s",
505 m->m_pkthdr.rcvif->if_xname));
506 m_freem(m);
507 return;
508 }
509 m->m_data -= iplen;
510
511 carp_proto_input_c(m, ch, AF_INET);
512 }
513
514 #ifdef INET6
515 int
516 carp6_proto_input(struct mbuf **mp, int *offp, int proto)
517 {
518 struct mbuf *m = *mp;
519 struct carp_softc *sc = NULL;
520 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
521 struct carp_header *ch;
522 u_int len;
523
524 carpstats.carps_ipackets6++;
525
526 if (!carp_opts[CARPCTL_ALLOW]) {
527 m_freem(m);
528 return (IPPROTO_DONE);
529 }
530
531 /* check if received on a valid carp interface */
532 if (m->m_pkthdr.rcvif->if_type != IFT_CARP) {
533 carpstats.carps_badif++;
534 CARP_LOG(sc, ("packet received on non-carp interface: %s",
535 m->m_pkthdr.rcvif->if_xname));
536 m_freem(m);
537 return (IPPROTO_DONE);
538 }
539
540 /* verify that the IP TTL is 255 */
541 if (ip6->ip6_hlim != CARP_DFLTTL) {
542 carpstats.carps_badttl++;
543 CARP_LOG(sc, ("received ttl %d != %d on %s", ip6->ip6_hlim,
544 CARP_DFLTTL, m->m_pkthdr.rcvif->if_xname));
545 m_freem(m);
546 return (IPPROTO_DONE);
547 }
548
549 /* verify that we have a complete carp packet */
550 len = m->m_len;
551 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
552 if (ch == NULL) {
553 carpstats.carps_badlen++;
554 CARP_LOG(sc, ("packet size %u too small", len));
555 return (IPPROTO_DONE);
556 }
557
558
559 /* verify the CARP checksum */
560 m->m_data += *offp;
561 if (carp_cksum(m, sizeof(*ch))) {
562 carpstats.carps_badsum++;
563 CARP_LOG(sc, ("checksum failed, on %s",
564 m->m_pkthdr.rcvif->if_xname));
565 m_freem(m);
566 return (IPPROTO_DONE);
567 }
568 m->m_data -= *offp;
569
570 carp_proto_input_c(m, ch, AF_INET6);
571 return (IPPROTO_DONE);
572 }
573 #endif /* INET6 */
574
575 void
576 carp_proto_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af)
577 {
578 struct carp_softc *sc;
579 u_int64_t tmp_counter;
580 struct timeval sc_tv, ch_tv;
581
582 TAILQ_FOREACH(sc, &((struct carp_if *)
583 m->m_pkthdr.rcvif->if_carpdev->if_carp)->vhif_vrs, sc_list)
584 if (sc->sc_vhid == ch->carp_vhid)
585 break;
586
587 if (!sc || (sc->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) !=
588 (IFF_UP|IFF_RUNNING)) {
589 carpstats.carps_badvhid++;
590 m_freem(m);
591 return;
592 }
593
594 /*
595 * Check if our own advertisement was duplicated
596 * from a non simplex interface.
597 * XXX If there is no address on our physical interface
598 * there is no way to distinguish our ads from the ones
599 * another carp host might have sent us.
600 */
601 if ((sc->sc_carpdev->if_flags & IFF_SIMPLEX) == 0) {
602 struct sockaddr sa;
603 struct ifaddr *ifa;
604
605 bzero(&sa, sizeof(sa));
606 sa.sa_family = af;
607 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev);
608
609 if (ifa && af == AF_INET) {
610 struct ip *ip = mtod(m, struct ip *);
611 if (ip->ip_src.s_addr ==
612 ifatoia(ifa)->ia_addr.sin_addr.s_addr) {
613 m_freem(m);
614 return;
615 }
616 }
617 #ifdef INET6
618 if (ifa && af == AF_INET6) {
619 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
620 struct in6_addr in6_src, in6_found;
621
622 in6_src = ip6->ip6_src;
623 in6_found = ifatoia6(ifa)->ia_addr.sin6_addr;
624 if (IN6_IS_ADDR_LINKLOCAL(&in6_src))
625 in6_src.s6_addr16[1] = 0;
626 if (IN6_IS_ADDR_LINKLOCAL(&in6_found))
627 in6_found.s6_addr16[1] = 0;
628 if (IN6_ARE_ADDR_EQUAL(&in6_src, &in6_found)) {
629 m_freem(m);
630 return;
631 }
632 }
633 #endif /* INET6 */
634 }
635
636 microtime(&sc->sc_if.if_lastchange);
637 sc->sc_if.if_ipackets++;
638 sc->sc_if.if_ibytes += m->m_pkthdr.len;
639
640 /* verify the CARP version. */
641 if (ch->carp_version != CARP_VERSION) {
642 carpstats.carps_badver++;
643 sc->sc_if.if_ierrors++;
644 CARP_LOG(sc, ("invalid version %d != %d",
645 ch->carp_version, CARP_VERSION));
646 m_freem(m);
647 return;
648 }
649
650 /* verify the hash */
651 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
652 carpstats.carps_badauth++;
653 sc->sc_if.if_ierrors++;
654 CARP_LOG(sc, ("incorrect hash"));
655 m_freem(m);
656 return;
657 }
658
659 tmp_counter = ntohl(ch->carp_counter[0]);
660 tmp_counter = tmp_counter<<32;
661 tmp_counter += ntohl(ch->carp_counter[1]);
662
663 /* XXX Replay protection goes here */
664
665 sc->sc_init_counter = 0;
666 sc->sc_counter = tmp_counter;
667
668
669 sc_tv.tv_sec = sc->sc_advbase;
670 if (carp_suppress_preempt && sc->sc_advskew < 240)
671 sc_tv.tv_usec = 240 * 1000000 / 256;
672 else
673 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256;
674 ch_tv.tv_sec = ch->carp_advbase;
675 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
676
677 switch (sc->sc_state) {
678 case INIT:
679 break;
680 case MASTER:
681 /*
682 * If we receive an advertisement from a backup who's going to
683 * be more frequent than us, go into BACKUP state.
684 */
685 if (timercmp(&sc_tv, &ch_tv, >) ||
686 timercmp(&sc_tv, &ch_tv, ==)) {
687 callout_stop(&sc->sc_ad_tmo);
688 carp_set_state(sc, BACKUP);
689 carp_setrun(sc, 0);
690 carp_setroute(sc, RTM_DELETE);
691 }
692 break;
693 case BACKUP:
694 /*
695 * If we're pre-empting masters who advertise slower than us,
696 * and this one claims to be slower, treat him as down.
697 */
698 if (carp_opts[CARPCTL_PREEMPT] && timercmp(&sc_tv, &ch_tv, <)) {
699 carp_master_down(sc);
700 break;
701 }
702
703 /*
704 * If the master is going to advertise at such a low frequency
705 * that he's guaranteed to time out, we'd might as well just
706 * treat him as timed out now.
707 */
708 sc_tv.tv_sec = sc->sc_advbase * 3;
709 if (timercmp(&sc_tv, &ch_tv, <)) {
710 carp_master_down(sc);
711 break;
712 }
713
714 /*
715 * Otherwise, we reset the counter and wait for the next
716 * advertisement.
717 */
718 carp_setrun(sc, af);
719 break;
720 }
721
722 m_freem(m);
723 return;
724 }
725
726 /*
727 * Interface side of the CARP implementation.
728 */
729
730 /* ARGSUSED */
731 void
732 carpattach(int n)
733 {
734 if_clone_attach(&carp_cloner);
735 }
736
737 int
738 carp_clone_create(struct if_clone *ifc, int unit)
739 {
740 extern int ifqmaxlen;
741 struct carp_softc *sc;
742 struct ifnet *ifp;
743
744 sc = malloc(sizeof(*sc), M_DEVBUF, M_NOWAIT);
745 if (!sc)
746 return (ENOMEM);
747 bzero(sc, sizeof(*sc));
748
749 sc->sc_suppress = 0;
750 sc->sc_advbase = CARP_DFLTINTV;
751 sc->sc_vhid = -1; /* required setting */
752 sc->sc_advskew = 0;
753 sc->sc_init_counter = 1;
754 sc->sc_naddrs = sc->sc_naddrs6 = 0;
755 #ifdef INET6
756 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
757 #endif /* INET6 */
758
759 callout_init(&sc->sc_ad_tmo);
760 callout_init(&sc->sc_md_tmo);
761 callout_init(&sc->sc_md6_tmo);
762
763 callout_setfunc(&sc->sc_ad_tmo, carp_send_ad, sc);
764 callout_setfunc(&sc->sc_md_tmo, carp_master_down, sc);
765 callout_setfunc(&sc->sc_md6_tmo, carp_master_down, sc);
766
767 LIST_INIT(&sc->carp_mc_listhead);
768 ifp = &sc->sc_if;
769 ifp->if_softc = sc;
770 snprintf(ifp->if_xname, sizeof ifp->if_xname, "%s%d", ifc->ifc_name,
771 unit);
772 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
773 ifp->if_ioctl = carp_ioctl;
774 ifp->if_start = carp_start;
775 ifp->if_output = carp_output;
776 ifp->if_type = IFT_CARP;
777 ifp->if_addrlen = ETHER_ADDR_LEN;
778 ifp->if_hdrlen = ETHER_HDR_LEN;
779 ifp->if_mtu = ETHERMTU;
780 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
781 IFQ_SET_READY(&ifp->if_snd);
782 if_attach(ifp);
783
784 if_alloc_sadl(ifp);
785 ifp->if_broadcastaddr = etherbroadcastaddr;
786 carp_set_enaddr(sc);
787 LIST_INIT(&sc->sc_ac.ec_multiaddrs);
788 #if NBPFILTER > 0
789 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN);
790 #endif
791 return (0);
792 }
793
794 int
795 carp_clone_destroy(struct ifnet *ifp)
796 {
797 carpdetach(ifp->if_softc);
798 ether_ifdetach(ifp);
799 if_detach(ifp);
800 free(ifp->if_softc, M_DEVBUF);
801
802 return (0);
803 }
804
805 void
806 carpdetach(struct carp_softc *sc)
807 {
808 struct carp_if *cif;
809 int s;
810
811 callout_stop(&sc->sc_ad_tmo);
812 callout_stop(&sc->sc_md_tmo);
813 callout_stop(&sc->sc_md6_tmo);
814
815 if (sc->sc_suppress)
816 carp_suppress_preempt--;
817 sc->sc_suppress = 0;
818
819 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
820 carp_suppress_preempt--;
821 sc->sc_sendad_errors = 0;
822
823 carp_set_state(sc, INIT);
824 sc->sc_if.if_flags &= ~IFF_UP;
825 carp_setrun(sc, 0);
826 carp_multicast_cleanup(sc);
827
828 s = splnet();
829 if (sc->sc_carpdev != NULL) {
830 /* XXX linkstatehook removal */
831 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
832 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
833 if (!--cif->vhif_nvrs) {
834 ifpromisc(sc->sc_carpdev, 0);
835 sc->sc_carpdev->if_carp = NULL;
836 FREE(cif, M_IFADDR);
837 }
838 }
839 sc->sc_carpdev = NULL;
840 splx(s);
841 }
842
843 /* Detach an interface from the carp. */
844 void
845 carp_ifdetach(struct ifnet *ifp)
846 {
847 struct carp_softc *sc, *nextsc;
848 struct carp_if *cif = (struct carp_if *)ifp->if_carp;
849
850 for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) {
851 nextsc = TAILQ_NEXT(sc, sc_list);
852 carpdetach(sc);
853 }
854 }
855
856 int
857 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc,
858 struct carp_header *ch)
859 {
860 if (sc->sc_init_counter) {
861 /* this could also be seconds since unix epoch */
862 sc->sc_counter = arc4random();
863 sc->sc_counter = sc->sc_counter << 32;
864 sc->sc_counter += arc4random();
865 } else
866 sc->sc_counter++;
867
868 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff);
869 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff);
870
871 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
872
873 return (0);
874 }
875
876 void
877 carp_send_ad_all(void)
878 {
879 struct ifnet *ifp;
880 struct carp_if *cif;
881 struct carp_softc *vh;
882
883 TAILQ_FOREACH(ifp, &ifnet, if_list) {
884 if (ifp->if_carp == NULL || ifp->if_type == IFT_CARP)
885 continue;
886
887 cif = (struct carp_if *)ifp->if_carp;
888 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
889 if ((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) ==
890 (IFF_UP|IFF_RUNNING) && vh->sc_state == MASTER)
891 carp_send_ad(vh);
892 }
893 }
894 }
895
896
897 void
898 carp_send_ad(void *v)
899 {
900 struct carp_header ch;
901 struct timeval tv;
902 struct carp_softc *sc = v;
903 struct carp_header *ch_ptr;
904 struct mbuf *m;
905 int error, len, advbase, advskew, s;
906 struct ifaddr *ifa;
907 struct sockaddr sa;
908
909 s = splsoftnet();
910
911 advbase = advskew = 0; /* Sssssh compiler */
912 if (sc->sc_carpdev == NULL) {
913 sc->sc_if.if_oerrors++;
914 goto retry_later;
915 }
916
917 /* bow out if we've gone to backup (the carp interface is going down) */
918 if (sc->sc_bow_out) {
919 sc->sc_bow_out = 0;
920 advbase = 255;
921 advskew = 255;
922 } else {
923 advbase = sc->sc_advbase;
924 if (!carp_suppress_preempt || sc->sc_advskew > 240)
925 advskew = sc->sc_advskew;
926 else
927 advskew = 240;
928 tv.tv_sec = advbase;
929 tv.tv_usec = advskew * 1000000 / 256;
930 }
931
932 ch.carp_version = CARP_VERSION;
933 ch.carp_type = CARP_ADVERTISEMENT;
934 ch.carp_vhid = sc->sc_vhid;
935 ch.carp_advbase = advbase;
936 ch.carp_advskew = advskew;
937 ch.carp_authlen = 7; /* XXX DEFINE */
938 ch.carp_pad1 = 0; /* must be zero */
939 ch.carp_cksum = 0;
940
941
942 #ifdef INET
943 if (sc->sc_naddrs) {
944 struct ip *ip;
945
946 MGETHDR(m, M_DONTWAIT, MT_HEADER);
947 if (m == NULL) {
948 sc->sc_if.if_oerrors++;
949 carpstats.carps_onomem++;
950 /* XXX maybe less ? */
951 goto retry_later;
952 }
953 len = sizeof(*ip) + sizeof(ch);
954 m->m_pkthdr.len = len;
955 m->m_pkthdr.rcvif = NULL;
956 m->m_len = len;
957 MH_ALIGN(m, m->m_len);
958 m->m_flags |= M_MCAST;
959 ip = mtod(m, struct ip *);
960 ip->ip_v = IPVERSION;
961 ip->ip_hl = sizeof(*ip) >> 2;
962 ip->ip_tos = IPTOS_LOWDELAY;
963 ip->ip_len = htons(len);
964 ip->ip_id = htons(ip_randomid());
965 ip->ip_off = htons(IP_DF);
966 ip->ip_ttl = CARP_DFLTTL;
967 ip->ip_p = IPPROTO_CARP;
968 ip->ip_sum = 0;
969
970 bzero(&sa, sizeof(sa));
971 sa.sa_family = AF_INET;
972 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev);
973 if (ifa == NULL)
974 ip->ip_src.s_addr = 0;
975 else
976 ip->ip_src.s_addr =
977 ifatoia(ifa)->ia_addr.sin_addr.s_addr;
978 ip->ip_dst.s_addr = INADDR_CARP_GROUP;
979
980 ch_ptr = (struct carp_header *)(&ip[1]);
981 bcopy(&ch, ch_ptr, sizeof(ch));
982 if (carp_prepare_ad(m, sc, ch_ptr))
983 goto retry_later;
984
985 m->m_data += sizeof(*ip);
986 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip));
987 m->m_data -= sizeof(*ip);
988
989 microtime(&sc->sc_if.if_lastchange);
990 sc->sc_if.if_opackets++;
991 sc->sc_if.if_obytes += len;
992 carpstats.carps_opackets++;
993
994 error = ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo,
995 NULL);
996 if (error) {
997 if (error == ENOBUFS)
998 carpstats.carps_onomem++;
999 else
1000 CARP_LOG(sc, ("ip_output failed: %d", error));
1001 sc->sc_if.if_oerrors++;
1002 if (sc->sc_sendad_errors < INT_MAX)
1003 sc->sc_sendad_errors++;
1004 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1005 carp_suppress_preempt++;
1006 if (carp_suppress_preempt == 1)
1007 carp_send_ad_all();
1008 }
1009 sc->sc_sendad_success = 0;
1010 } else {
1011 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1012 if (++sc->sc_sendad_success >=
1013 CARP_SENDAD_MIN_SUCCESS) {
1014 carp_suppress_preempt--;
1015 sc->sc_sendad_errors = 0;
1016 }
1017 } else
1018 sc->sc_sendad_errors = 0;
1019 }
1020 }
1021 #endif /* INET */
1022 #ifdef INET6
1023 if (sc->sc_naddrs6) {
1024 struct ip6_hdr *ip6;
1025
1026 MGETHDR(m, M_DONTWAIT, MT_HEADER);
1027 if (m == NULL) {
1028 sc->sc_if.if_oerrors++;
1029 carpstats.carps_onomem++;
1030 /* XXX maybe less ? */
1031 goto retry_later;
1032 }
1033 len = sizeof(*ip6) + sizeof(ch);
1034 m->m_pkthdr.len = len;
1035 m->m_pkthdr.rcvif = NULL;
1036 m->m_len = len;
1037 MH_ALIGN(m, m->m_len);
1038 m->m_flags |= M_MCAST;
1039 ip6 = mtod(m, struct ip6_hdr *);
1040 bzero(ip6, sizeof(*ip6));
1041 ip6->ip6_vfc |= IPV6_VERSION;
1042 ip6->ip6_hlim = CARP_DFLTTL;
1043 ip6->ip6_nxt = IPPROTO_CARP;
1044
1045 /* set the source address */
1046 bzero(&sa, sizeof(sa));
1047 sa.sa_family = AF_INET6;
1048 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev);
1049 if (ifa == NULL) /* This should never happen with IPv6 */
1050 bzero(&ip6->ip6_src, sizeof(struct in6_addr));
1051 else
1052 bcopy(ifatoia6(ifa)->ia_addr.sin6_addr.s6_addr,
1053 &ip6->ip6_src, sizeof(struct in6_addr));
1054 /* set the multicast destination */
1055
1056 ip6->ip6_dst.s6_addr8[0] = 0xff;
1057 ip6->ip6_dst.s6_addr8[1] = 0x02;
1058 ip6->ip6_dst.s6_addr8[15] = 0x12;
1059
1060 ch_ptr = (struct carp_header *)(&ip6[1]);
1061 bcopy(&ch, ch_ptr, sizeof(ch));
1062 if (carp_prepare_ad(m, sc, ch_ptr))
1063 goto retry_later;
1064
1065 m->m_data += sizeof(*ip6);
1066 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6));
1067 m->m_data -= sizeof(*ip6);
1068
1069 microtime(&sc->sc_if.if_lastchange);
1070 sc->sc_if.if_opackets++;
1071 sc->sc_if.if_obytes += len;
1072 carpstats.carps_opackets6++;
1073
1074 error = ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL);
1075 if (error) {
1076 if (error == ENOBUFS)
1077 carpstats.carps_onomem++;
1078 else
1079 CARP_LOG(sc, ("ip6_output failed: %d", error));
1080 sc->sc_if.if_oerrors++;
1081 if (sc->sc_sendad_errors < INT_MAX)
1082 sc->sc_sendad_errors++;
1083 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1084 carp_suppress_preempt++;
1085 if (carp_suppress_preempt == 1)
1086 carp_send_ad_all();
1087 }
1088 sc->sc_sendad_success = 0;
1089 } else {
1090 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1091 if (++sc->sc_sendad_success >=
1092 CARP_SENDAD_MIN_SUCCESS) {
1093 carp_suppress_preempt--;
1094 sc->sc_sendad_errors = 0;
1095 }
1096 } else
1097 sc->sc_sendad_errors = 0;
1098 }
1099 }
1100 #endif /* INET6 */
1101
1102 retry_later:
1103 splx(s);
1104 if (advbase != 255 || advskew != 255)
1105 callout_schedule(&sc->sc_ad_tmo, tvtohz(&tv));
1106 }
1107
1108 /*
1109 * Broadcast a gratuitous ARP request containing
1110 * the virtual router MAC address for each IP address
1111 * associated with the virtual router.
1112 */
1113 void
1114 carp_send_arp(struct carp_softc *sc)
1115 {
1116 struct ifaddr *ifa;
1117 struct in_addr *in;
1118 int s = splsoftnet();
1119
1120 TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) {
1121
1122 if (ifa->ifa_addr->sa_family != AF_INET)
1123 continue;
1124
1125 in = &ifatoia(ifa)->ia_addr.sin_addr;
1126 arprequest(sc->sc_carpdev, in, in, LLADDR(sc->sc_if.if_sadl));
1127 DELAY(1000); /* XXX */
1128 }
1129 splx(s);
1130 }
1131
1132 #ifdef INET6
1133 void
1134 carp_send_na(struct carp_softc *sc)
1135 {
1136 struct ifaddr *ifa;
1137 struct in6_addr *in6;
1138 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1139 int s = splsoftnet();
1140
1141 TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) {
1142
1143 if (ifa->ifa_addr->sa_family != AF_INET6)
1144 continue;
1145
1146 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
1147 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1148 ND_NA_FLAG_OVERRIDE, 1, NULL);
1149 DELAY(1000); /* XXX */
1150 }
1151 splx(s);
1152 }
1153 #endif /* INET6 */
1154
1155 /*
1156 * Based on bridge_hash() in if_bridge.c
1157 */
1158 #define mix(a,b,c) \
1159 do { \
1160 a -= b; a -= c; a ^= (c >> 13); \
1161 b -= c; b -= a; b ^= (a << 8); \
1162 c -= a; c -= b; c ^= (b >> 13); \
1163 a -= b; a -= c; a ^= (c >> 12); \
1164 b -= c; b -= a; b ^= (a << 16); \
1165 c -= a; c -= b; c ^= (b >> 5); \
1166 a -= b; a -= c; a ^= (c >> 3); \
1167 b -= c; b -= a; b ^= (a << 10); \
1168 c -= a; c -= b; c ^= (b >> 15); \
1169 } while (0)
1170
1171 u_int32_t
1172 carp_hash(struct carp_softc *sc, u_char *src)
1173 {
1174 u_int32_t a = 0x9e3779b9, b = sc->sc_hashkey[0], c = sc->sc_hashkey[1];
1175
1176 c += sc->sc_key[3] << 24;
1177 c += sc->sc_key[2] << 16;
1178 c += sc->sc_key[1] << 8;
1179 c += sc->sc_key[0];
1180 b += src[5] << 8;
1181 b += src[4];
1182 a += src[3] << 24;
1183 a += src[2] << 16;
1184 a += src[1] << 8;
1185 a += src[0];
1186
1187 mix(a, b, c);
1188 return (c);
1189 }
1190
1191 int
1192 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type)
1193 {
1194 struct carp_softc *vh;
1195 struct ifaddr *ifa;
1196 int count = 0;
1197
1198 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1199 if ((type == CARP_COUNT_RUNNING &&
1200 (vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) ==
1201 (IFF_UP|IFF_RUNNING)) ||
1202 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) {
1203 TAILQ_FOREACH(ifa, &vh->sc_if.if_addrlist, ifa_list) {
1204 if (ifa->ifa_addr->sa_family == AF_INET &&
1205 ia->ia_addr.sin_addr.s_addr ==
1206 ifatoia(ifa)->ia_addr.sin_addr.s_addr)
1207 count++;
1208 }
1209 }
1210 }
1211 return (count);
1212 }
1213
1214 int
1215 carp_iamatch(struct in_ifaddr *ia, u_char *src,
1216 u_int32_t *count, u_int32_t index)
1217 {
1218 struct carp_softc *sc = ia->ia_ifp->if_softc;
1219
1220 if (carp_opts[CARPCTL_ARPBALANCE]) {
1221 /*
1222 * We use the source ip to decide which virtual host should
1223 * handle the request. If we're master of that virtual host,
1224 * then we respond, otherwise, just drop the arp packet on
1225 * the floor.
1226 */
1227
1228 /* Count the elegible carp interfaces with this address */
1229 if (*count == 0)
1230 *count = carp_addrcount(
1231 (struct carp_if *)ia->ia_ifp->if_carpdev->if_carp,
1232 ia, CARP_COUNT_RUNNING);
1233
1234 /* This should never happen, but... */
1235 if (*count == 0)
1236 return (0);
1237
1238 if (carp_hash(sc, src) % *count == index - 1 &&
1239 sc->sc_state == MASTER) {
1240 return (1);
1241 }
1242 } else {
1243 if (sc->sc_state == MASTER)
1244 return (1);
1245 }
1246
1247 return (0);
1248 }
1249
1250 #ifdef INET6
1251 struct ifaddr *
1252 carp_iamatch6(void *v, struct in6_addr *taddr)
1253 {
1254 struct carp_if *cif = v;
1255 struct carp_softc *vh;
1256 struct ifaddr *ifa;
1257
1258 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1259 TAILQ_FOREACH(ifa, &vh->sc_if.if_addrlist, ifa_list) {
1260 if (IN6_ARE_ADDR_EQUAL(taddr,
1261 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1262 ((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) ==
1263 (IFF_UP|IFF_RUNNING)) && vh->sc_state == MASTER)
1264 return (ifa);
1265 }
1266 }
1267
1268 return (NULL);
1269 }
1270 #endif /* INET6 */
1271
1272 struct ifnet *
1273 carp_ourether(void *v, struct ether_header *eh, u_char iftype, int src)
1274 {
1275 struct carp_if *cif = (struct carp_if *)v;
1276 struct carp_softc *vh;
1277 u_int8_t *ena;
1278
1279 if (src)
1280 ena = (u_int8_t *)&eh->ether_shost;
1281 else
1282 ena = (u_int8_t *)&eh->ether_dhost;
1283
1284 switch (iftype) {
1285 case IFT_ETHER:
1286 case IFT_FDDI:
1287 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
1288 return (NULL);
1289 break;
1290 case IFT_ISO88025:
1291 if (ena[0] != 3 || ena[1] || ena[4] || ena[5])
1292 return (NULL);
1293 break;
1294 default:
1295 return (NULL);
1296 break;
1297 }
1298
1299 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list)
1300 if ((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) ==
1301 (IFF_UP|IFF_RUNNING) && vh->sc_state == MASTER &&
1302 !bcmp(ena, LLADDR(vh->sc_if.if_sadl),
1303 ETHER_ADDR_LEN)) {
1304 return (&vh->sc_if);
1305 }
1306
1307 return (NULL);
1308 }
1309
1310 int
1311 carp_input(struct mbuf *m, u_int8_t *shost, u_int8_t *dhost, u_int16_t etype)
1312 {
1313 struct ether_header eh;
1314 struct carp_if *cif = (struct carp_if *)m->m_pkthdr.rcvif->if_carp;
1315 struct ifnet *ifp;
1316
1317 bcopy(shost, &eh.ether_shost, sizeof(eh.ether_shost));
1318 bcopy(dhost, &eh.ether_dhost, sizeof(eh.ether_dhost));
1319 eh.ether_type = etype;
1320
1321 if (m->m_flags & (M_BCAST|M_MCAST)) {
1322 struct carp_softc *vh;
1323 struct mbuf *m0;
1324
1325 /*
1326 * XXX Should really check the list of multicast addresses
1327 * for each CARP interface _before_ copying.
1328 */
1329 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1330 m0 = m_copym(m, 0, M_COPYALL, M_DONTWAIT);
1331 if (m0 == NULL)
1332 continue;
1333 m0->m_pkthdr.rcvif = &vh->sc_if;
1334 ether_input(&vh->sc_if, m0);
1335 }
1336 return (1);
1337 }
1338
1339 ifp = carp_ourether(cif, &eh, m->m_pkthdr.rcvif->if_type, 0);
1340 if (ifp == NULL) {
1341 return (1);
1342 }
1343
1344 m->m_pkthdr.rcvif = ifp;
1345
1346 #if NBPFILTER > 0
1347 if (ifp->if_bpf)
1348 bpf_mtap(ifp->if_bpf, m);
1349 #endif
1350 ifp->if_ipackets++;
1351 ether_input(ifp, m);
1352 return (0);
1353 }
1354
1355 void
1356 carp_master_down(void *v)
1357 {
1358 struct carp_softc *sc = v;
1359
1360 switch (sc->sc_state) {
1361 case INIT:
1362 printf("%s: master_down event in INIT state\n",
1363 sc->sc_if.if_xname);
1364 break;
1365 case MASTER:
1366 break;
1367 case BACKUP:
1368 carp_set_state(sc, MASTER);
1369 carp_send_ad(sc);
1370 carp_send_arp(sc);
1371 #ifdef INET6
1372 carp_send_na(sc);
1373 #endif /* INET6 */
1374 carp_setrun(sc, 0);
1375 carp_setroute(sc, RTM_ADD);
1376 break;
1377 }
1378 }
1379
1380 /*
1381 * When in backup state, af indicates whether to reset the master down timer
1382 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1383 */
1384 void
1385 carp_setrun(struct carp_softc *sc, sa_family_t af)
1386 {
1387 struct timeval tv;
1388
1389 if (sc->sc_carpdev == NULL) {
1390 sc->sc_if.if_flags &= ~IFF_RUNNING;
1391 carp_set_state(sc, INIT);
1392 return;
1393 }
1394
1395 if (sc->sc_if.if_flags & IFF_UP && sc->sc_vhid > 0 &&
1396 (sc->sc_naddrs || sc->sc_naddrs6) && !sc->sc_suppress) {
1397 sc->sc_if.if_flags |= IFF_RUNNING;
1398 } else {
1399 sc->sc_if.if_flags &= ~IFF_RUNNING;
1400 carp_setroute(sc, RTM_DELETE);
1401 return;
1402 }
1403
1404 switch (sc->sc_state) {
1405 case INIT:
1406 carp_set_state(sc, BACKUP);
1407 carp_setroute(sc, RTM_DELETE);
1408 carp_setrun(sc, 0);
1409 break;
1410 case BACKUP:
1411 callout_stop(&sc->sc_ad_tmo);
1412 tv.tv_sec = 3 * sc->sc_advbase;
1413 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1414 switch (af) {
1415 #ifdef INET
1416 case AF_INET:
1417 callout_schedule(&sc->sc_md_tmo, tvtohz(&tv));
1418 break;
1419 #endif /* INET */
1420 #ifdef INET6
1421 case AF_INET6:
1422 callout_schedule(&sc->sc_md6_tmo, tvtohz(&tv));
1423 break;
1424 #endif /* INET6 */
1425 default:
1426 if (sc->sc_naddrs)
1427 callout_schedule(&sc->sc_md_tmo, tvtohz(&tv));
1428 if (sc->sc_naddrs6)
1429 callout_schedule(&sc->sc_md6_tmo, tvtohz(&tv));
1430 break;
1431 }
1432 break;
1433 case MASTER:
1434 tv.tv_sec = sc->sc_advbase;
1435 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1436 callout_schedule(&sc->sc_ad_tmo, tvtohz(&tv));
1437 break;
1438 }
1439 }
1440
1441 void
1442 carp_multicast_cleanup(struct carp_softc *sc)
1443 {
1444 struct ip_moptions *imo = &sc->sc_imo;
1445 #ifdef INET6
1446 struct ip6_moptions *im6o = &sc->sc_im6o;
1447 #endif
1448 u_int16_t n = imo->imo_num_memberships;
1449
1450 /* Clean up our own multicast memberships */
1451 while (n-- > 0) {
1452 if (imo->imo_membership[n] != NULL) {
1453 in_delmulti(imo->imo_membership[n]);
1454 imo->imo_membership[n] = NULL;
1455 }
1456 }
1457 imo->imo_num_memberships = 0;
1458 imo->imo_multicast_ifp = NULL;
1459
1460 #ifdef INET6
1461 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1462 struct in6_multi_mship *imm =
1463 LIST_FIRST(&im6o->im6o_memberships);
1464
1465 LIST_REMOVE(imm, i6mm_chain);
1466 in6_leavegroup(imm);
1467 }
1468 im6o->im6o_multicast_ifp = NULL;
1469 #endif
1470
1471 /* And any other multicast memberships */
1472 carp_ether_purgemulti(sc);
1473 }
1474
1475 int
1476 carp_set_ifp(struct carp_softc *sc, struct ifnet *ifp)
1477 {
1478 struct carp_if *cif, *ncif = NULL;
1479 struct carp_softc *vr, *after = NULL;
1480 int myself = 0, error = 0;
1481 int s;
1482
1483 if (ifp == sc->sc_carpdev)
1484 return (0);
1485
1486 if (ifp != NULL) {
1487 if ((ifp->if_flags & IFF_MULTICAST) == 0)
1488 return (EADDRNOTAVAIL);
1489
1490 if (ifp->if_type == IFT_CARP)
1491 return (EINVAL);
1492
1493 if (ifp->if_carp == NULL) {
1494 MALLOC(ncif, struct carp_if *, sizeof(*cif),
1495 M_IFADDR, M_NOWAIT);
1496 if (ncif == NULL)
1497 return (ENOBUFS);
1498 if ((error = ifpromisc(ifp, 1))) {
1499 FREE(ncif, M_IFADDR);
1500 return (error);
1501 }
1502
1503 ncif->vhif_ifp = ifp;
1504 TAILQ_INIT(&ncif->vhif_vrs);
1505 } else {
1506 cif = (struct carp_if *)ifp->if_carp;
1507 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1508 if (vr != sc && vr->sc_vhid == sc->sc_vhid)
1509 return (EINVAL);
1510 }
1511
1512 /* detach from old interface */
1513 if (sc->sc_carpdev != NULL)
1514 carpdetach(sc);
1515
1516 /* join multicast groups */
1517 if (sc->sc_naddrs < 0 &&
1518 (error = carp_join_multicast(sc)) != 0) {
1519 if (ncif != NULL)
1520 FREE(ncif, M_IFADDR);
1521 return (error);
1522 }
1523
1524 #ifdef INET6
1525 if (sc->sc_naddrs6 < 0 &&
1526 (error = carp_join_multicast6(sc)) != 0) {
1527 if (ncif != NULL)
1528 FREE(ncif, M_IFADDR);
1529 carp_multicast_cleanup(sc);
1530 return (error);
1531 }
1532 #endif
1533
1534 /* attach carp interface to physical interface */
1535 if (ncif != NULL)
1536 ifp->if_carp = (caddr_t)ncif;
1537 sc->sc_carpdev = ifp;
1538 cif = (struct carp_if *)ifp->if_carp;
1539 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1540 if (vr == sc)
1541 myself = 1;
1542 if (vr->sc_vhid < sc->sc_vhid)
1543 after = vr;
1544 }
1545
1546 if (!myself) {
1547 /* We're trying to keep things in order */
1548 if (after == NULL) {
1549 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1550 } else {
1551 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after,
1552 sc, sc_list);
1553 }
1554 cif->vhif_nvrs++;
1555 }
1556 if (sc->sc_naddrs || sc->sc_naddrs6)
1557 sc->sc_if.if_flags |= IFF_UP;
1558 carp_set_enaddr(sc);
1559 s = splnet();
1560 /* XXX linkstatehooks establish */
1561 carp_carpdev_state(ifp);
1562 splx(s);
1563 } else {
1564 carpdetach(sc);
1565 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
1566 }
1567 return (0);
1568 }
1569
1570 void
1571 carp_set_enaddr(struct carp_softc *sc)
1572 {
1573 if (sc->sc_carpdev && sc->sc_carpdev->if_type == IFT_ISO88025) {
1574 LLADDR(sc->sc_if.if_sadl)[0] = 3;
1575 LLADDR(sc->sc_if.if_sadl)[1] = 0;
1576 LLADDR(sc->sc_if.if_sadl)[2] = 0x40 >> (sc->sc_vhid - 1);
1577 LLADDR(sc->sc_if.if_sadl)[3] = 0x40000 >> (sc->sc_vhid - 1);
1578 LLADDR(sc->sc_if.if_sadl)[4] = 0;
1579 LLADDR(sc->sc_if.if_sadl)[5] = 0;
1580 } else {
1581 LLADDR(sc->sc_if.if_sadl)[0] = 0;
1582 LLADDR(sc->sc_if.if_sadl)[1] = 0;
1583 LLADDR(sc->sc_if.if_sadl)[2] = 0x5e;
1584 LLADDR(sc->sc_if.if_sadl)[3] = 0;
1585 LLADDR(sc->sc_if.if_sadl)[4] = 1;
1586 LLADDR(sc->sc_if.if_sadl)[5] = sc->sc_vhid;
1587 }
1588 }
1589
1590 void
1591 carp_addr_updated(void *v)
1592 {
1593 struct carp_softc *sc = (struct carp_softc *) v;
1594 struct ifaddr *ifa;
1595 int new_naddrs = 0, new_naddrs6 = 0;
1596
1597 TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) {
1598 if (ifa->ifa_addr->sa_family == AF_INET)
1599 new_naddrs++;
1600 else if (ifa->ifa_addr->sa_family == AF_INET6)
1601 new_naddrs6++;
1602 }
1603
1604 /* Handle a callback after SIOCDIFADDR */
1605 if (new_naddrs < sc->sc_naddrs || new_naddrs6 < sc->sc_naddrs6) {
1606 struct in_addr mc_addr;
1607 struct in_multi *inm;
1608
1609 sc->sc_naddrs = new_naddrs;
1610 sc->sc_naddrs6 = new_naddrs6;
1611
1612 /* Re-establish multicast membership removed by in_control */
1613 mc_addr.s_addr = INADDR_CARP_GROUP;
1614 IN_LOOKUP_MULTI(mc_addr, &sc->sc_if, inm);
1615 if (inm == NULL) {
1616 bzero(&sc->sc_imo, sizeof(sc->sc_imo));
1617
1618 if (sc->sc_carpdev != NULL && sc->sc_naddrs > 0)
1619 carp_join_multicast(sc);
1620 }
1621
1622 if (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0) {
1623 sc->sc_if.if_flags &= ~IFF_UP;
1624 carp_set_state(sc, INIT);
1625 } else
1626 carp_hmac_prepare(sc);
1627 }
1628
1629 carp_setrun(sc, 0);
1630 }
1631
1632 int
1633 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1634 {
1635 struct ifnet *ifp = sc->sc_carpdev;
1636 struct in_ifaddr *ia, *ia_if;
1637 int error = 0;
1638
1639 if (sin->sin_addr.s_addr == 0) {
1640 if (!(sc->sc_if.if_flags & IFF_UP))
1641 carp_set_state(sc, INIT);
1642 if (sc->sc_naddrs)
1643 sc->sc_if.if_flags |= IFF_UP;
1644 carp_setrun(sc, 0);
1645 return (0);
1646 }
1647
1648 /* we have to do this by hand to ensure we don't match on ourselves */
1649 ia_if = NULL;
1650 for (ia = TAILQ_FIRST(&in_ifaddrhead); ia;
1651 ia = TAILQ_NEXT(ia, ia_list)) {
1652
1653 /* and, yeah, we need a multicast-capable iface too */
1654 if (ia->ia_ifp != &sc->sc_if &&
1655 ia->ia_ifp->if_type != IFT_CARP &&
1656 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1657 (sin->sin_addr.s_addr & ia->ia_subnetmask) ==
1658 ia->ia_subnet) {
1659 if (!ia_if)
1660 ia_if = ia;
1661 }
1662 }
1663
1664 if (ia_if) {
1665 ia = ia_if;
1666 if (ifp) {
1667 if (ifp != ia->ia_ifp)
1668 return (EADDRNOTAVAIL);
1669 } else {
1670 ifp = ia->ia_ifp;
1671 }
1672 }
1673
1674 if ((error = carp_set_ifp(sc, ifp)))
1675 return (error);
1676
1677 if (sc->sc_carpdev == NULL)
1678 return (EADDRNOTAVAIL);
1679
1680 if (sc->sc_naddrs == 0 && (error = carp_join_multicast(sc)) != 0)
1681 return (error);
1682
1683 sc->sc_naddrs++;
1684 if (sc->sc_carpdev != NULL)
1685 sc->sc_if.if_flags |= IFF_UP;
1686
1687 carp_set_state(sc, INIT);
1688 carp_setrun(sc, 0);
1689
1690 /*
1691 * Hook if_addrhooks so that we get a callback after in_ifinit has run,
1692 * to correct any inappropriate routes that it inserted.
1693 */
1694 if (sc->ah_cookie == 0) {
1695 /* XXX link address hook */
1696 }
1697
1698 return (0);
1699 }
1700
1701 int
1702 carp_join_multicast(struct carp_softc *sc)
1703 {
1704 struct ip_moptions *imo = &sc->sc_imo, tmpimo;
1705 struct in_addr addr;
1706
1707 bzero(&tmpimo, sizeof(tmpimo));
1708 addr.s_addr = INADDR_CARP_GROUP;
1709 if ((tmpimo.imo_membership[0] =
1710 in_addmulti(&addr, &sc->sc_if)) == NULL) {
1711 return (ENOBUFS);
1712 }
1713
1714 imo->imo_membership[0] = tmpimo.imo_membership[0];
1715 imo->imo_num_memberships = 1;
1716 imo->imo_multicast_ifp = &sc->sc_if;
1717 imo->imo_multicast_ttl = CARP_DFLTTL;
1718 imo->imo_multicast_loop = 0;
1719 return (0);
1720 }
1721
1722
1723 #ifdef INET6
1724 int
1725 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1726 {
1727 struct ifnet *ifp = sc->sc_carpdev;
1728 struct in6_ifaddr *ia, *ia_if;
1729 int error = 0;
1730
1731 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1732 if (!(sc->sc_if.if_flags & IFF_UP))
1733 carp_set_state(sc, INIT);
1734 if (sc->sc_naddrs6)
1735 sc->sc_if.if_flags |= IFF_UP;
1736 carp_setrun(sc, 0);
1737 return (0);
1738 }
1739
1740 /* we have to do this by hand to ensure we don't match on ourselves */
1741 ia_if = NULL;
1742 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1743 int i;
1744
1745 for (i = 0; i < 4; i++) {
1746 if ((sin6->sin6_addr.s6_addr32[i] &
1747 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
1748 (ia->ia_addr.sin6_addr.s6_addr32[i] &
1749 ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
1750 break;
1751 }
1752 /* and, yeah, we need a multicast-capable iface too */
1753 if (ia->ia_ifp != &sc->sc_if &&
1754 ia->ia_ifp->if_type != IFT_CARP &&
1755 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1756 (i == 4)) {
1757 if (!ia_if)
1758 ia_if = ia;
1759 }
1760 }
1761
1762 if (ia_if) {
1763 ia = ia_if;
1764 if (sc->sc_carpdev) {
1765 if (sc->sc_carpdev != ia->ia_ifp)
1766 return (EADDRNOTAVAIL);
1767 } else {
1768 ifp = ia->ia_ifp;
1769 }
1770 }
1771
1772 if ((error = carp_set_ifp(sc, ifp)))
1773 return (error);
1774
1775 if (sc->sc_carpdev == NULL)
1776 return (EADDRNOTAVAIL);
1777
1778 if (sc->sc_naddrs6 == 0 && (error = carp_join_multicast6(sc)) != 0)
1779 return (error);
1780
1781 sc->sc_naddrs6++;
1782 if (sc->sc_carpdev != NULL)
1783 sc->sc_if.if_flags |= IFF_UP;
1784 carp_set_state(sc, INIT);
1785 carp_setrun(sc, 0);
1786
1787 return (0);
1788 }
1789
1790 int
1791 carp_join_multicast6(struct carp_softc *sc)
1792 {
1793 struct in6_multi_mship *imm, *imm2;
1794 struct ip6_moptions *im6o = &sc->sc_im6o;
1795 struct sockaddr_in6 addr6;
1796 int error;
1797
1798 /* Join IPv6 CARP multicast group */
1799 bzero(&addr6, sizeof(addr6));
1800 addr6.sin6_family = AF_INET6;
1801 addr6.sin6_len = sizeof(addr6);
1802 addr6.sin6_addr.s6_addr16[0] = htons(0xff02);
1803 addr6.sin6_addr.s6_addr16[1] = htons(sc->sc_if.if_index);
1804 addr6.sin6_addr.s6_addr8[15] = 0x12;
1805 if ((imm = in6_joingroup(&sc->sc_if,
1806 &addr6.sin6_addr, &error, 0)) == NULL) {
1807 return (error);
1808 }
1809 /* join solicited multicast address */
1810 bzero(&addr6.sin6_addr, sizeof(addr6.sin6_addr));
1811 addr6.sin6_addr.s6_addr16[0] = htons(0xff02);
1812 addr6.sin6_addr.s6_addr16[1] = htons(sc->sc_if.if_index);
1813 addr6.sin6_addr.s6_addr32[1] = 0;
1814 addr6.sin6_addr.s6_addr32[2] = htonl(1);
1815 addr6.sin6_addr.s6_addr32[3] = 0;
1816 addr6.sin6_addr.s6_addr8[12] = 0xff;
1817 if ((imm2 = in6_joingroup(&sc->sc_if,
1818 &addr6.sin6_addr, &error, 0)) == NULL) {
1819 in6_leavegroup(imm);
1820 return (error);
1821 }
1822
1823 /* apply v6 multicast membership */
1824 im6o->im6o_multicast_ifp = &sc->sc_if;
1825 if (imm)
1826 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm,
1827 i6mm_chain);
1828 if (imm2)
1829 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm2,
1830 i6mm_chain);
1831
1832 return (0);
1833 }
1834
1835 #endif /* INET6 */
1836
1837 int
1838 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr)
1839 {
1840 struct lwp *l = curlwp; /* XXX */
1841 struct carp_softc *sc = ifp->if_softc, *vr;
1842 struct carpreq carpr;
1843 struct ifaddr *ifa;
1844 struct ifreq *ifr;
1845 struct ifnet *cdev = NULL;
1846 int error = 0;
1847
1848 ifa = (struct ifaddr *)addr;
1849 ifr = (struct ifreq *)addr;
1850
1851 switch (cmd) {
1852 case SIOCSIFADDR:
1853 switch (ifa->ifa_addr->sa_family) {
1854 #ifdef INET
1855 case AF_INET:
1856 sc->sc_if.if_flags |= IFF_UP;
1857 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1858 sizeof(struct sockaddr));
1859 error = carp_set_addr(sc, satosin(ifa->ifa_addr));
1860 break;
1861 #endif /* INET */
1862 #ifdef INET6
1863 case AF_INET6:
1864 sc->sc_if.if_flags|= IFF_UP;
1865 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr));
1866 break;
1867 #endif /* INET6 */
1868 default:
1869 error = EAFNOSUPPORT;
1870 break;
1871 }
1872 break;
1873
1874 case SIOCSIFFLAGS:
1875 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) {
1876 callout_stop(&sc->sc_ad_tmo);
1877 callout_stop(&sc->sc_md_tmo);
1878 callout_stop(&sc->sc_md6_tmo);
1879 if (sc->sc_state == MASTER) {
1880 /* we need the interface up to bow out */
1881 sc->sc_if.if_flags |= IFF_UP;
1882 sc->sc_bow_out = 1;
1883 carp_send_ad(sc);
1884 }
1885 sc->sc_if.if_flags &= ~IFF_UP;
1886 carp_set_state(sc, INIT);
1887 carp_setrun(sc, 0);
1888 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) {
1889 sc->sc_if.if_flags |= IFF_UP;
1890 carp_setrun(sc, 0);
1891 }
1892 break;
1893
1894 case SIOCSVH:
1895 if (l == NULL)
1896 break;
1897 if ((error = kauth_authorize_network(l->l_cred,
1898 KAUTH_NETWORK_INTERFACE,
1899 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd,
1900 NULL)) != 0)
1901 break;
1902 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr)))
1903 break;
1904 error = 1;
1905 if (carpr.carpr_carpdev[0] != '\0' &&
1906 (cdev = ifunit(carpr.carpr_carpdev)) == NULL)
1907 return (EINVAL);
1908 if ((error = carp_set_ifp(sc, cdev)))
1909 return (error);
1910 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) {
1911 switch (carpr.carpr_state) {
1912 case BACKUP:
1913 callout_stop(&sc->sc_ad_tmo);
1914 carp_set_state(sc, BACKUP);
1915 carp_setrun(sc, 0);
1916 carp_setroute(sc, RTM_DELETE);
1917 break;
1918 case MASTER:
1919 carp_master_down(sc);
1920 break;
1921 default:
1922 break;
1923 }
1924 }
1925 if (carpr.carpr_vhid > 0) {
1926 if (carpr.carpr_vhid > 255) {
1927 error = EINVAL;
1928 break;
1929 }
1930 if (sc->sc_carpdev) {
1931 struct carp_if *cif;
1932 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1933 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1934 if (vr != sc &&
1935 vr->sc_vhid == carpr.carpr_vhid)
1936 return (EINVAL);
1937 }
1938 sc->sc_vhid = carpr.carpr_vhid;
1939 carp_set_enaddr(sc);
1940 carp_set_state(sc, INIT);
1941 error--;
1942 }
1943 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) {
1944 if (carpr.carpr_advskew > 254) {
1945 error = EINVAL;
1946 break;
1947 }
1948 if (carpr.carpr_advbase > 255) {
1949 error = EINVAL;
1950 break;
1951 }
1952 sc->sc_advbase = carpr.carpr_advbase;
1953 sc->sc_advskew = carpr.carpr_advskew;
1954 error--;
1955 }
1956 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key));
1957 if (error > 0)
1958 error = EINVAL;
1959 else {
1960 error = 0;
1961 carp_setrun(sc, 0);
1962 }
1963 break;
1964
1965 case SIOCGVH:
1966 bzero(&carpr, sizeof(carpr));
1967 if (sc->sc_carpdev != NULL)
1968 strlcpy(carpr.carpr_carpdev, sc->sc_carpdev->if_xname,
1969 IFNAMSIZ);
1970 carpr.carpr_state = sc->sc_state;
1971 carpr.carpr_vhid = sc->sc_vhid;
1972 carpr.carpr_advbase = sc->sc_advbase;
1973 carpr.carpr_advskew = sc->sc_advskew;
1974
1975 if ((l == NULL) || (error = kauth_authorize_network(l->l_cred,
1976 KAUTH_NETWORK_INTERFACE,
1977 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd,
1978 NULL)) != 0)
1979 bcopy(sc->sc_key, carpr.carpr_key,
1980 sizeof(carpr.carpr_key));
1981 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
1982 break;
1983
1984 case SIOCADDMULTI:
1985 error = carp_ether_addmulti(sc, ifr);
1986 break;
1987
1988 case SIOCDELMULTI:
1989 error = carp_ether_delmulti(sc, ifr);
1990 break;
1991
1992 default:
1993 error = EINVAL;
1994 }
1995
1996 carp_hmac_prepare(sc);
1997 return (error);
1998 }
1999
2000
2001 /*
2002 * Start output on carp interface. This function should never be called.
2003 */
2004 void
2005 carp_start(struct ifnet *ifp)
2006 {
2007 #ifdef DEBUG
2008 printf("%s: start called\n", ifp->if_xname);
2009 #endif
2010 }
2011
2012 int
2013 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
2014 struct rtentry *rt)
2015 {
2016 struct carp_softc *sc = ((struct carp_softc *)ifp->if_softc);
2017
2018 if (sc->sc_carpdev != NULL && sc->sc_state == MASTER) {
2019 return (sc->sc_carpdev->if_output(ifp, m, sa, rt));
2020 } else {
2021 m_freem(m);
2022 return (ENETUNREACH);
2023 }
2024 }
2025
2026 void
2027 carp_set_state(struct carp_softc *sc, int state)
2028 {
2029 if (sc->sc_state == state)
2030 return;
2031
2032 sc->sc_state = state;
2033 switch (state) {
2034 case BACKUP:
2035 sc->sc_if.if_link_state = LINK_STATE_DOWN;
2036 break;
2037 case MASTER:
2038 sc->sc_if.if_link_state = LINK_STATE_UP;
2039 break;
2040 default:
2041 sc->sc_if.if_link_state = LINK_STATE_UNKNOWN;
2042 break;
2043 }
2044 rt_ifmsg(&sc->sc_if);
2045 }
2046
2047 void
2048 carp_carpdev_state(void *v)
2049 {
2050 struct carp_if *cif;
2051 struct carp_softc *sc;
2052 struct ifnet *ifp = v;
2053
2054 if (ifp->if_type == IFT_CARP)
2055 return;
2056
2057 cif = (struct carp_if *)ifp->if_carp;
2058
2059 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
2060 int suppressed = sc->sc_suppress;
2061
2062 if (sc->sc_carpdev->if_link_state == LINK_STATE_DOWN ||
2063 !(sc->sc_carpdev->if_flags & IFF_UP)) {
2064 sc->sc_if.if_flags &= ~IFF_RUNNING;
2065 callout_stop(&sc->sc_ad_tmo);
2066 callout_stop(&sc->sc_md_tmo);
2067 callout_stop(&sc->sc_md6_tmo);
2068 carp_set_state(sc, INIT);
2069 sc->sc_suppress = 1;
2070 carp_setrun(sc, 0);
2071 if (!suppressed) {
2072 carp_suppress_preempt++;
2073 if (carp_suppress_preempt == 1)
2074 carp_send_ad_all();
2075 }
2076 } else {
2077 carp_set_state(sc, INIT);
2078 sc->sc_suppress = 0;
2079 carp_setrun(sc, 0);
2080 if (suppressed)
2081 carp_suppress_preempt--;
2082 }
2083 }
2084 }
2085
2086 int
2087 carp_ether_addmulti(struct carp_softc *sc, struct ifreq *ifr)
2088 {
2089 struct ifnet *ifp;
2090 struct carp_mc_entry *mc;
2091 u_int8_t addrlo[ETHER_ADDR_LEN], addrhi[ETHER_ADDR_LEN];
2092 int error;
2093
2094 ifp = sc->sc_carpdev;
2095 if (ifp == NULL)
2096 return (EINVAL);
2097
2098 error = ether_addmulti(ifr, &sc->sc_ac);
2099 if (error != ENETRESET)
2100 return (error);
2101
2102 /*
2103 * This is new multicast address. We have to tell parent
2104 * about it. Also, remember this multicast address so that
2105 * we can delete them on unconfigure.
2106 */
2107 MALLOC(mc, struct carp_mc_entry *, sizeof(struct carp_mc_entry),
2108 M_DEVBUF, M_NOWAIT);
2109 if (mc == NULL) {
2110 error = ENOMEM;
2111 goto alloc_failed;
2112 }
2113
2114 /*
2115 * As ether_addmulti() returns ENETRESET, following two
2116 * statement shouldn't fail.
2117 */
2118 (void)ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi);
2119 ETHER_LOOKUP_MULTI(addrlo, addrhi, &sc->sc_ac, mc->mc_enm);
2120 memcpy(&mc->mc_addr, &ifr->ifr_addr, ifr->ifr_addr.sa_len);
2121 LIST_INSERT_HEAD(&sc->carp_mc_listhead, mc, mc_entries);
2122
2123 error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)ifr);
2124 if (error != 0)
2125 goto ioctl_failed;
2126
2127 return (error);
2128
2129 ioctl_failed:
2130 LIST_REMOVE(mc, mc_entries);
2131 FREE(mc, M_DEVBUF);
2132 alloc_failed:
2133 (void)ether_delmulti(ifr, &sc->sc_ac);
2134
2135 return (error);
2136 }
2137
2138 int
2139 carp_ether_delmulti(struct carp_softc *sc, struct ifreq *ifr)
2140 {
2141 struct ifnet *ifp;
2142 struct ether_multi *enm;
2143 struct carp_mc_entry *mc;
2144 u_int8_t addrlo[ETHER_ADDR_LEN], addrhi[ETHER_ADDR_LEN];
2145 int error;
2146
2147 ifp = sc->sc_carpdev;
2148 if (ifp == NULL)
2149 return (EINVAL);
2150
2151 /*
2152 * Find a key to lookup carp_mc_entry. We have to do this
2153 * before calling ether_delmulti for obvious reason.
2154 */
2155 if ((error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi)) != 0)
2156 return (error);
2157 ETHER_LOOKUP_MULTI(addrlo, addrhi, &sc->sc_ac, enm);
2158 if (enm == NULL)
2159 return (EINVAL);
2160
2161 LIST_FOREACH(mc, &sc->carp_mc_listhead, mc_entries)
2162 if (mc->mc_enm == enm)
2163 break;
2164
2165 /* We won't delete entries we didn't add */
2166 if (mc == NULL)
2167 return (EINVAL);
2168
2169 error = ether_delmulti(ifr, &sc->sc_ac);
2170 if (error != ENETRESET)
2171 return (error);
2172
2173 /* We no longer use this multicast address. Tell parent so. */
2174 error = (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)ifr);
2175 if (error == 0) {
2176 /* And forget about this address. */
2177 LIST_REMOVE(mc, mc_entries);
2178 FREE(mc, M_DEVBUF);
2179 } else
2180 (void)ether_addmulti(ifr, &sc->sc_ac);
2181 return (error);
2182 }
2183
2184 /*
2185 * Delete any multicast address we have asked to add from parent
2186 * interface. Called when the carp is being unconfigured.
2187 */
2188 void
2189 carp_ether_purgemulti(struct carp_softc *sc)
2190 {
2191 struct ifnet *ifp = sc->sc_carpdev; /* Parent. */
2192 struct carp_mc_entry *mc;
2193 union {
2194 struct ifreq ifreq;
2195 struct {
2196 char ifr_name[IFNAMSIZ];
2197 struct sockaddr_storage ifr_ss;
2198 } ifreq_storage;
2199 } u;
2200 struct ifreq *ifr = &u.ifreq;
2201
2202 if (ifp == NULL)
2203 return;
2204
2205 memcpy(ifr->ifr_name, ifp->if_xname, IFNAMSIZ);
2206 while ((mc = LIST_FIRST(&sc->carp_mc_listhead)) != NULL) {
2207 memcpy(&ifr->ifr_addr, &mc->mc_addr, mc->mc_addr.ss_len);
2208 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)ifr);
2209 LIST_REMOVE(mc, mc_entries);
2210 FREE(mc, M_DEVBUF);
2211 }
2212 }
2213
2214 SYSCTL_SETUP(sysctl_net_inet_carp_setup, "sysctl net.inet.carp subtree setup")
2215 {
2216
2217 sysctl_createv(clog, 0, NULL, NULL,
2218 CTLFLAG_PERMANENT,
2219 CTLTYPE_NODE, "net", NULL,
2220 NULL, 0, NULL, 0,
2221 CTL_NET, CTL_EOL);
2222 sysctl_createv(clog, 0, NULL, NULL,
2223 CTLFLAG_PERMANENT,
2224 CTLTYPE_NODE, "inet", NULL,
2225 NULL, 0, NULL, 0,
2226 CTL_NET, PF_INET, CTL_EOL);
2227 sysctl_createv(clog, 0, NULL, NULL,
2228 CTLFLAG_PERMANENT,
2229 CTLTYPE_NODE, "carp",
2230 SYSCTL_DESCR("CARP related settings"),
2231 NULL, 0, NULL, 0,
2232 CTL_NET, PF_INET, IPPROTO_CARP, CTL_EOL);
2233
2234 sysctl_createv(clog, 0, NULL, NULL,
2235 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2236 CTLTYPE_INT, "preempt",
2237 SYSCTL_DESCR("Enable CARP Preempt"),
2238 NULL, 0, &carp_opts[CARPCTL_PREEMPT], 0,
2239 CTL_NET, PF_INET, IPPROTO_CARP,
2240 CTL_CREATE, CTL_EOL);
2241 sysctl_createv(clog, 0, NULL, NULL,
2242 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2243 CTLTYPE_INT, "arpbalance",
2244 SYSCTL_DESCR("Enable ARP balancing"),
2245 NULL, 0, &carp_opts[CARPCTL_ARPBALANCE], 0,
2246 CTL_NET, PF_INET, IPPROTO_CARP,
2247 CTL_CREATE, CTL_EOL);
2248 sysctl_createv(clog, 0, NULL, NULL,
2249 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2250 CTLTYPE_INT, "allow",
2251 SYSCTL_DESCR("Enable CARP"),
2252 NULL, 0, &carp_opts[CARPCTL_ALLOW], 0,
2253 CTL_NET, PF_INET, IPPROTO_CARP,
2254 CTL_CREATE, CTL_EOL);
2255 sysctl_createv(clog, 0, NULL, NULL,
2256 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2257 CTLTYPE_INT, "log",
2258 SYSCTL_DESCR("CARP logging"),
2259 NULL, 0, &carp_opts[CARPCTL_LOG], 0,
2260 CTL_NET, PF_INET, IPPROTO_CARP,
2261 CTL_CREATE, CTL_EOL);
2262 sysctl_createv(clog, 0, NULL, NULL,
2263 CTLFLAG_PERMANENT,
2264 CTLTYPE_STRUCT, "stats",
2265 SYSCTL_DESCR("CARP statistics"),
2266 NULL, 0, &carpstats, sizeof(carpstats),
2267 CTL_NET, PF_INET, IPPROTO_CARP, CARPCTL_STATS,
2268 CTL_EOL);
2269 }
Cache object: c981ebf1359bda053215d41a61807b01
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