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Install dma(8) config files with mode 640 as root:mail to prevent ``normal''
[dragonfly.git] / sys / netinet / ip_carp.c
blobfb471956bd6321cd1dfce872beedff2329f7978c
1 /*
2 * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
3 * Copyright (c) 2003 Ryan McBride. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
18 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
20 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
22 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
23 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
24 * THE POSSIBILITY OF SUCH DAMAGE.
25 */
26 /*
27 * $FreeBSD: src/sys/netinet/ip_carp.c,v 1.48 2007/02/02 09:39:09 glebius Exp $
28 * $DragonFly: src/sys/netinet/ip_carp.c,v 1.6 2008/01/11 11:59:40 sephe Exp $
29 */
30
31 #include "opt_carp.h"
32 /*#include "opt_bpf.h"*/
33 #include "opt_inet.h"
34 #include "opt_inet6.h"
35
36 #include <sys/types.h>
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/conf.h>
40 #include <sys/kernel.h>
41 #include <machine/limits.h>
42 #include <sys/malloc.h>
43 #include <sys/mbuf.h>
44 #include <sys/module.h>
45 #include <sys/time.h>
46 #include <sys/proc.h>
47 #include <sys/sysctl.h>
48 #include <sys/syslog.h>
49 #include <sys/signalvar.h>
50 #include <sys/filio.h>
51 #include <sys/sockio.h>
52 #include <sys/in_cksum.h>
53 #include <sys/socket.h>
54 #include <sys/vnode.h>
55
56 #include <machine/stdarg.h>
57
58 #include <net/bpf.h>
59 #include <net/ethernet.h>
60 #include <net/if.h>
61 #include <net/if_dl.h>
62 #include <net/if_types.h>
63 #include <net/route.h>
64 #include <net/if_clone.h>
65
66 #ifdef INET
67 #include <netinet/in.h>
68 #include <netinet/in_var.h>
69 #include <netinet/in_systm.h>
70 #include <netinet/ip.h>
71 #include <netinet/ip_var.h>
72 #include <netinet/if_ether.h>
73 #endif
74
75 #ifdef INET6
76 #include <netinet/icmp6.h>
77 #include <netinet/ip6.h>
78 #include <netinet6/ip6_var.h>
79 #include <netinet6/scope6_var.h>
80 #include <netinet6/nd6.h>
81 #endif
82
83 #include <crypto/sha1.h>
84 #include <netinet/ip_carp.h>
85 #include <sys/lock.h>
86
87 #define CARP_IFNAME "carp"
88 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces");
89 static MALLOC_DEFINE(M_IFNET, "IFNET", "IFNET CARP?");
90 SYSCTL_DECL(_net_inet_carp);
91
92 struct carp_softc {
93 struct ifnet *sc_ifp; /* Interface clue */
94 struct ifnet *sc_carpdev; /* Pointer to parent interface */
95 struct in_ifaddr *sc_ia; /* primary iface address */
96 struct ip_moptions sc_imo;
97 #ifdef INET6
98 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */
99 struct ip6_moptions sc_im6o;
100 #endif /* INET6 */
101 TAILQ_ENTRY(carp_softc) sc_list;
102
103 enum { INIT = 0, BACKUP, MASTER } sc_state;
104
105 int sc_flags_backup;
106 int sc_suppress;
107
108 int sc_sendad_errors;
109 #define CARP_SENDAD_MAX_ERRORS 3
110 int sc_sendad_success;
111 #define CARP_SENDAD_MIN_SUCCESS 3
112
113 int sc_vhid;
114 int sc_advskew;
115 int sc_naddrs;
116 int sc_naddrs6;
117 int sc_advbase; /* seconds */
118 int sc_init_counter;
119 u_int64_t sc_counter;
120
121 /* authentication */
122 #define CARP_HMAC_PAD 64
123 unsigned char sc_key[CARP_KEY_LEN];
124 unsigned char sc_pad[CARP_HMAC_PAD];
125 SHA1_CTX sc_sha1;
126
127 struct callout sc_ad_tmo; /* advertisement timeout */
128 struct callout sc_md_tmo; /* master down timeout */
129 struct callout sc_md6_tmo; /* master down timeout */
130
131 LIST_ENTRY(carp_softc) sc_next; /* Interface clue */
132 };
133 #define SC2IFP(sc) ((sc)->sc_ifp)
134
135 int carp_suppress_preempt = 0;
136 int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */
137 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW,
138 &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets");
139 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW,
140 &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode");
141 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW,
142 &carp_opts[CARPCTL_LOG], 0, "log bad carp packets");
143 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW,
144 &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses");
145 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD,
146 &carp_suppress_preempt, 0, "Preemption is suppressed");
147
148 struct carpstats carpstats;
149 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW,
150 &carpstats, carpstats,
151 "CARP statistics (struct carpstats, netinet/ip_carp.h)");
152
153 struct carp_if {
154 TAILQ_HEAD(, carp_softc) vhif_vrs;
155 int vhif_nvrs;
156
157 struct ifnet *vhif_ifp;
158 struct lock vhif_lock;
159 };
160
161 /* Get carp_if from softc. Valid after carp_set_addr{,6}. */
162 #define SC2CIF(sc) ((struct carp_if *)(sc)->sc_carpdev->if_carp)
163
164 #define CARP_LOCK_INIT(cif) lockinit(&(cif)->vhif_lock, "carp_if", 0, LK_NOWAIT);
165 #define CARP_LOCK_DESTROY(cif) ;
166 #define CARP_LOCK_ASSERT(cif) ;
167 #define CARP_LOCK(cif) lockmgr(&(cif)->vhif_lock, LK_EXCLUSIVE);
168 #define CARP_UNLOCK(cif) lockmgr(&(cif)->vhif_lock, LK_RELEASE);
169
170 #define CARP_SCLOCK(sc) lockmgr(&SC2CIF(sc)->vhif_lock, LK_EXCLUSIVE);
171 #define CARP_SCUNLOCK(sc) lockmgr(&SC2CIF(sc)->vhif_lock, LK_RELEASE);
172 #define CARP_SCLOCK_ASSERT(sc) ;
173
174 #define CARP_LOG(...) do { \
175 if (carp_opts[CARPCTL_LOG] > 0) \
176 log(LOG_INFO, __VA_ARGS__); \
177 } while (0)
178
179 #define CARP_DEBUG(...) do { \
180 if (carp_opts[CARPCTL_LOG] > 1) \
181 log(LOG_DEBUG, __VA_ARGS__); \
182 } while (0)
183
184 static void carp_hmac_prepare(struct carp_softc *);
185 static void carp_hmac_generate(struct carp_softc *, u_int32_t *,
186 unsigned char *);
187 static int carp_hmac_verify(struct carp_softc *, u_int32_t *,
188 unsigned char *);
189 static void carp_setroute(struct carp_softc *, int);
190 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t);
191 static int carp_clone_create(struct if_clone *, int);
192 static void carp_clone_destroy(struct ifnet *);
193 static void carpdetach(struct carp_softc *, int);
194 static int carp_prepare_ad(struct mbuf *, struct carp_softc *,
195 struct carp_header *);
196 static void carp_send_ad_all(void);
197 static void carp_send_ad(void *);
198 static void carp_send_ad_locked(struct carp_softc *);
199 static void carp_send_arp(struct carp_softc *);
200 static void carp_master_down(void *);
201 static void carp_master_down_locked(struct carp_softc *);
202 static int carp_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
203 static int carp_looutput(struct ifnet *, struct mbuf *, struct sockaddr *,
204 struct rtentry *);
205 static void carp_start(struct ifnet *);
206 static void carp_setrun(struct carp_softc *, sa_family_t);
207 static void carp_set_state(struct carp_softc *, int);
208 static int carp_addrcount(struct carp_if *, struct in_ifaddr *, int);
209 enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING };
210
211 static void carp_multicast_cleanup(struct carp_softc *);
212 static int carp_set_addr(struct carp_softc *, struct sockaddr_in *);
213 static int carp_del_addr(struct carp_softc *, struct sockaddr_in *);
214 static void carp_carpdev_state_locked(struct carp_if *);
215 static void carp_sc_state_locked(struct carp_softc *);
216 #ifdef INET6
217 static void carp_send_na(struct carp_softc *);
218 static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *);
219 static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *);
220 static void carp_multicast6_cleanup(struct carp_softc *);
221 #endif
222
223 static LIST_HEAD(, carp_softc) carpif_list;
224
225 struct if_clone carp_cloner = IF_CLONE_INITIALIZER(CARP_IFNAME, carp_clone_create, carp_clone_destroy, 0, IF_MAXUNIT);
226
227 static eventhandler_tag if_detach_event_tag;
228
229 static __inline u_int16_t
230 carp_cksum(struct mbuf *m, int len)
231 {
232 return (in_cksum(m, len));
233 }
234
235 static void
236 carp_hmac_prepare(struct carp_softc *sc)
237 {
238 u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
239 u_int8_t vhid = sc->sc_vhid & 0xff;
240 struct ifaddr *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
326 if (sc->sc_carpdev)
327 CARP_SCLOCK_ASSERT(sc);
328
329 crit_enter();
330 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
331 if (ifa->ifa_addr->sa_family == AF_INET &&
332 sc->sc_carpdev != NULL) {
333 int count = carp_addrcount(
334 (struct carp_if *)sc->sc_carpdev->if_carp,
335 ifatoia(ifa), CARP_COUNT_MASTER);
336
337 if ((cmd == RTM_ADD && count == 1) ||
338 (cmd == RTM_DELETE && count == 0))
339 rtinit(ifa, cmd, RTF_UP | RTF_HOST);
340 }
341 #ifdef INET6
342 if (ifa->ifa_addr->sa_family == AF_INET6) {
343 if (cmd == RTM_ADD)
344 in6_ifaddloop(ifa);
345 else
346 in6_ifremloop(ifa);
347 }
348 #endif /* INET6 */
349 }
350 crit_exit();
351
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) = kmalloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO);
363
364 sc->sc_flags_backup = 0;
365 sc->sc_suppress = 0;
366 sc->sc_advbase = CARP_DFLTINTV;
367 sc->sc_vhid = -1; /* required setting */
368 sc->sc_advskew = 0;
369 sc->sc_init_counter = 1;
370 sc->sc_naddrs = sc->sc_naddrs6 = 0; /* M_ZERO? */
371
372 #ifdef INET6
373 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
374 #endif
375
376 /* sc->sc_imo.imo_membership = kmalloc((sizeof(struct in_multi) * IP_MAX_MEMBERSHIPS), M_CARP,M_WAITOK);*/
377 /*
378 sc->sc_imo.imo_max_memberships = IP_MAX_MEMBERSHIPS;
379 sc->sc_imo.imo_multicast_vif = -1;
380 */
381 callout_init(&sc->sc_ad_tmo);
382 callout_init(&sc->sc_md_tmo);
383 callout_init(&sc->sc_md6_tmo);
384
385 ifp->if_softc = sc;
386 if_initname(ifp, CARP_IFNAME, unit);
387 ifp->if_mtu = ETHERMTU;
388 ifp->if_flags = IFF_LOOPBACK;
389 ifp->if_ioctl = carp_ioctl;
390 ifp->if_output = carp_looutput;
391 ifp->if_start = carp_start;
392 ifp->if_type = IFT_CARP;
393 ifp->if_snd.ifq_maxlen = ifqmaxlen;
394 ifp->if_hdrlen = 0;
395 if_attach(ifp, NULL);
396 bpfattach(ifp, DLT_NULL, sizeof(u_int));
397
398 crit_enter();
399 LIST_INSERT_HEAD(&carpif_list, sc, sc_next);
400 crit_exit();
401
402 return (0);
403 }
404
405 static void
406 carp_clone_destroy(struct ifnet *ifp)
407 {
408 struct carp_softc *sc = ifp->if_softc;
409
410 if (sc->sc_carpdev)
411 CARP_SCLOCK(sc);
412 carpdetach(sc, 1); /* Returns unlocked. */
413
414 crit_enter();
415 LIST_REMOVE(sc, sc_next);
416 crit_exit();
417 bpfdetach(ifp);
418 if_detach(ifp);
419 /* if_free_type(ifp, IFT_ETHER);*/
420 /* kfree(sc->sc_imo.imo_membership, M_CARP); */
421 kfree(sc, M_CARP);
422 }
423
424 /*
425 * This function can be called on CARP interface destroy path,
426 * and in case of the removal of the underlying interface as
427 * well. We differentiate these two cases. In the latter case
428 * we do not cleanup our multicast memberships, since they
429 * are already freed. Also, in the latter case we do not
430 * release the lock on return, because the function will be
431 * called once more, for another CARP instance on the same
432 * interface.
433 */
434 static void
435 carpdetach(struct carp_softc *sc, int unlock)
436 {
437 struct carp_if *cif;
438
439 callout_stop(&sc->sc_ad_tmo);
440 callout_stop(&sc->sc_md_tmo);
441 callout_stop(&sc->sc_md6_tmo);
442
443 if (sc->sc_suppress)
444 carp_suppress_preempt--;
445 sc->sc_suppress = 0;
446
447 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
448 carp_suppress_preempt--;
449 sc->sc_sendad_errors = 0;
450
451 carp_set_state(sc, INIT);
452 SC2IFP(sc)->if_flags &= ~IFF_UP;
453 carp_setrun(sc, 0);
454 if (unlock)
455 carp_multicast_cleanup(sc);
456 #ifdef INET6
457 carp_multicast6_cleanup(sc);
458 #endif
459
460 if (sc->sc_carpdev != NULL) {
461 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
462 CARP_LOCK_ASSERT(cif);
463 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
464 if (!--cif->vhif_nvrs) {
465 ifpromisc(sc->sc_carpdev, 0);
466 sc->sc_carpdev->if_carp = NULL;
467 CARP_LOCK_DESTROY(cif);
468 FREE(cif, M_IFADDR);
469 } else if (unlock)
470 CARP_UNLOCK(cif);
471 sc->sc_carpdev = NULL;
472 }
473 }
474
475 /* Detach an interface from the carp. */
476 static void
477 carp_ifdetach(void *arg __unused, struct ifnet *ifp)
478 {
479 struct carp_if *cif = (struct carp_if *)ifp->if_carp;
480 struct carp_softc *sc, *nextsc;
481
482 if (cif == NULL)
483 return;
484
485 /*
486 * XXX: At the end of for() cycle the lock will be destroyed.
487 */
488 CARP_LOCK(cif);
489 for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) {
490 nextsc = TAILQ_NEXT(sc, sc_list);
491 carpdetach(sc, 0);
492 }
493 CARP_UNLOCK(cif);
494 }
495
496 /*
497 * process input packet.
498 * we have rearranged checks order compared to the rfc,
499 * but it seems more efficient this way or not possible otherwise.
500 */
501 void
502 carp_input(struct mbuf *m, int hlen)
503 {
504 struct ip *ip = mtod(m, struct ip *);
505 struct carp_header *ch;
506 int iplen, len;
507
508 carpstats.carps_ipackets++;
509
510 if (!carp_opts[CARPCTL_ALLOW]) {
511 m_freem(m);
512 return;
513 }
514
515 /* check if received on a valid carp interface */
516 if (m->m_pkthdr.rcvif->if_carp == NULL) {
517 carpstats.carps_badif++;
518 CARP_LOG("carp_input: packet received on non-carp "
519 "interface: %s\n",
520 m->m_pkthdr.rcvif->if_xname);
521 m_freem(m);
522 return;
523 }
524
525 /* verify that the IP TTL is 255. */
526 if (ip->ip_ttl != CARP_DFLTTL) {
527 carpstats.carps_badttl++;
528 CARP_LOG("carp_input: received ttl %d != 255i on %s\n",
529 ip->ip_ttl,
530 m->m_pkthdr.rcvif->if_xname);
531 m_freem(m);
532 return;
533 }
534
535 iplen = ip->ip_hl << 2;
536
537 if (m->m_pkthdr.len < iplen + sizeof(*ch)) {
538 carpstats.carps_badlen++;
539 CARP_LOG("carp_input: received len %zd < "
540 "sizeof(struct carp_header)\n",
541 m->m_len - sizeof(struct ip));
542 m_freem(m);
543 return;
544 }
545
546 if (iplen + sizeof(*ch) < m->m_len) {
547 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) {
548 carpstats.carps_hdrops++;
549 CARP_LOG("carp_input: pullup failed\n");
550 return;
551 }
552 ip = mtod(m, struct ip *);
553 }
554 ch = (struct carp_header *)((char *)ip + iplen);
555
556 /*
557 * verify that the received packet length is
558 * equal to the CARP header
559 */
560 len = iplen + sizeof(*ch);
561 if (len > m->m_pkthdr.len) {
562 carpstats.carps_badlen++;
563 CARP_LOG("carp_input: packet too short %d on %s\n",
564 m->m_pkthdr.len,
565 m->m_pkthdr.rcvif->if_xname);
566 m_freem(m);
567 return;
568 }
569
570 if ((m = m_pullup(m, len)) == NULL) {
571 carpstats.carps_hdrops++;
572 return;
573 }
574 ip = mtod(m, struct ip *);
575 ch = (struct carp_header *)((char *)ip + iplen);
576
577 /* verify the CARP checksum */
578 m->m_data += iplen;
579 if (carp_cksum(m, len - iplen)) {
580 carpstats.carps_badsum++;
581 CARP_LOG("carp_input: checksum failed on %s\n",
582 m->m_pkthdr.rcvif->if_xname);
583 m_freem(m);
584 return;
585 }
586 m->m_data -= iplen;
587
588 carp_input_c(m, ch, AF_INET);
589 }
590
591 #ifdef INET6
592 int
593 carp6_input(struct mbuf **mp, int *offp, int proto)
594 {
595 struct mbuf *m = *mp;
596 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
597 struct carp_header *ch;
598 u_int len;
599
600 carpstats.carps_ipackets6++;
601
602 if (!carp_opts[CARPCTL_ALLOW]) {
603 m_freem(m);
604 return (IPPROTO_DONE);
605 }
606
607 /* check if received on a valid carp interface */
608 if (m->m_pkthdr.rcvif->if_carp == NULL) {
609 carpstats.carps_badif++;
610 CARP_LOG("carp6_input: packet received on non-carp "
611 "interface: %s\n",
612 m->m_pkthdr.rcvif->if_xname);
613 m_freem(m);
614 return (IPPROTO_DONE);
615 }
616
617 /* verify that the IP TTL is 255 */
618 if (ip6->ip6_hlim != CARP_DFLTTL) {
619 carpstats.carps_badttl++;
620 CARP_LOG("carp6_input: received ttl %d != 255 on %s\n",
621 ip6->ip6_hlim,
622 m->m_pkthdr.rcvif->if_xname);
623 m_freem(m);
624 return (IPPROTO_DONE);
625 }
626
627 /* verify that we have a complete carp packet */
628 len = m->m_len;
629 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
630 if (ch == NULL) {
631 carpstats.carps_badlen++;
632 CARP_LOG("carp6_input: packet size %u too small\n", len);
633 return (IPPROTO_DONE);
634 }
635
636
637 /* verify the CARP checksum */
638 m->m_data += *offp;
639 if (carp_cksum(m, sizeof(*ch))) {
640 carpstats.carps_badsum++;
641 CARP_LOG("carp6_input: checksum failed, on %s\n",
642 m->m_pkthdr.rcvif->if_xname);
643 m_freem(m);
644 return (IPPROTO_DONE);
645 }
646 m->m_data -= *offp;
647
648 carp_input_c(m, ch, AF_INET6);
649 return (IPPROTO_DONE);
650 }
651 #endif /* INET6 */
652
653 static void
654 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af)
655 {
656 struct ifnet *ifp = m->m_pkthdr.rcvif;
657 struct carp_softc *sc;
658 u_int64_t tmp_counter;
659 struct timeval sc_tv, ch_tv;
660
661 /* verify that the VHID is valid on the receiving interface */
662 CARP_LOCK(ifp->if_carp);
663 TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list)
664 if (sc->sc_vhid == ch->carp_vhid)
665 break;
666
667 if (!sc || !((SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING))) {
668 carpstats.carps_badvhid++;
669 CARP_UNLOCK(ifp->if_carp);
670 m_freem(m);
671 return;
672 }
673
674 getmicrotime(&SC2IFP(sc)->if_lastchange);
675 SC2IFP(sc)->if_ipackets++;
676 SC2IFP(sc)->if_ibytes += m->m_pkthdr.len;
677
678 if (SC2IFP(sc)->if_bpf) {
679 struct ip *ip = mtod(m, struct ip *);
680
681 /* BPF wants net byte order */
682 ip->ip_len = htons(ip->ip_len + (ip->ip_hl << 2));
683 ip->ip_off = htons(ip->ip_off);
684 bpf_mtap(SC2IFP(sc)->if_bpf, m);
685 }
686
687 /* verify the CARP version. */
688 if (ch->carp_version != CARP_VERSION) {
689 carpstats.carps_badver++;
690 SC2IFP(sc)->if_ierrors++;
691 CARP_UNLOCK(ifp->if_carp);
692 CARP_LOG("%s; invalid version %d\n",
693 SC2IFP(sc)->if_xname,
694 ch->carp_version);
695 m_freem(m);
696 return;
697 }
698
699 /* verify the hash */
700 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
701 carpstats.carps_badauth++;
702 SC2IFP(sc)->if_ierrors++;
703 CARP_UNLOCK(ifp->if_carp);
704 CARP_LOG("%s: incorrect hash\n", SC2IFP(sc)->if_xname);
705 m_freem(m);
706 return;
707 }
708
709 tmp_counter = ntohl(ch->carp_counter[0]);
710 tmp_counter = tmp_counter<<32;
711 tmp_counter += ntohl(ch->carp_counter[1]);
712
713 /* XXX Replay protection goes here */
714
715 sc->sc_init_counter = 0;
716 sc->sc_counter = tmp_counter;
717
718 sc_tv.tv_sec = sc->sc_advbase;
719 if (carp_suppress_preempt && sc->sc_advskew < 240)
720 sc_tv.tv_usec = 240 * 1000000 / 256;
721 else
722 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256;
723 ch_tv.tv_sec = ch->carp_advbase;
724 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
725
726 switch (sc->sc_state) {
727 case INIT:
728 break;
729 case MASTER:
730 /*
731 * If we receive an advertisement from a master who's going to
732 * be more frequent than us, go into BACKUP state.
733 */
734 if (timevalcmp(&sc_tv, &ch_tv, >) ||
735 timevalcmp(&sc_tv, &ch_tv, ==)) {
736 callout_stop(&sc->sc_ad_tmo);
737 CARP_DEBUG("%s: MASTER -> BACKUP "
738 "(more frequent advertisement received)\n",
739 SC2IFP(sc)->if_xname);
740 carp_set_state(sc, BACKUP);
741 carp_setrun(sc, 0);
742 carp_setroute(sc, RTM_DELETE);
743 }
744 break;
745 case BACKUP:
746 /*
747 * If we're pre-empting masters who advertise slower than us,
748 * and this one claims to be slower, treat him as down.
749 */
750 if (carp_opts[CARPCTL_PREEMPT] &&
751 timevalcmp(&sc_tv, &ch_tv, <)) {
752 CARP_DEBUG("%s: BACKUP -> MASTER "
753 "(preempting a slower master)\n",
754 SC2IFP(sc)->if_xname);
755 carp_master_down_locked(sc);
756 break;
757 }
758
759 /*
760 * If the master is going to advertise at such a low frequency
761 * that he's guaranteed to time out, we'd might as well just
762 * treat him as timed out now.
763 */
764 sc_tv.tv_sec = sc->sc_advbase * 3;
765 if (timevalcmp(&sc_tv, &ch_tv, <)) {
766 CARP_DEBUG("%s: BACKUP -> MASTER "
767 "(master timed out)\n",
768 SC2IFP(sc)->if_xname);
769 carp_master_down_locked(sc);
770 break;
771 }
772
773 /*
774 * Otherwise, we reset the counter and wait for the next
775 * advertisement.
776 */
777 carp_setrun(sc, af);
778 break;
779 }
780
781 CARP_UNLOCK(ifp->if_carp);
782
783 m_freem(m);
784 return;
785 }
786
787 static int
788 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch)
789 {
790 struct m_tag *mtag;
791 struct ifnet *ifp = SC2IFP(sc);
792
793 if (sc->sc_init_counter) {
794 /* this could also be seconds since unix epoch */
795 sc->sc_counter = karc4random();
796 sc->sc_counter = sc->sc_counter << 32;
797 sc->sc_counter += karc4random();
798 } else
799 sc->sc_counter++;
800
801 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff);
802 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff);
803
804 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
805
806 /* Tag packet for carp_output */
807 mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct ifnet *), MB_DONTWAIT);
808 if (mtag == NULL) {
809 m_freem(m);
810 SC2IFP(sc)->if_oerrors++;
811 return (ENOMEM);
812 }
813 bcopy(&ifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *));
814 m_tag_prepend(m, mtag);
815
816 return (0);
817 }
818
819 static void
820 carp_send_ad_all(void)
821 {
822 struct carp_softc *sc;
823
824 LIST_FOREACH(sc, &carpif_list, sc_next) {
825 if (sc->sc_carpdev == NULL)
826 continue;
827 CARP_SCLOCK(sc);
828 if ((SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING) &&
829 sc->sc_state == MASTER)
830 carp_send_ad_locked(sc);
831 CARP_SCUNLOCK(sc);
832 }
833 }
834
835 static void
836 carp_send_ad(void *v)
837 {
838 struct carp_softc *sc = v;
839
840 CARP_SCLOCK(sc);
841 carp_send_ad_locked(sc);
842 CARP_SCUNLOCK(sc);
843 }
844
845 static void
846 carp_send_ad_locked(struct carp_softc *sc)
847 {
848 struct carp_header ch;
849 struct timeval tv;
850 struct carp_header *ch_ptr;
851 struct mbuf *m;
852 int len, advbase, advskew;
853
854
855 /* bow out if we've lost our UPness or RUNNINGuiness */
856 if (!((SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING))) {
857 advbase = 255;
858 advskew = 255;
859 } else {
860 advbase = sc->sc_advbase;
861 if (!carp_suppress_preempt || sc->sc_advskew > 240)
862 advskew = sc->sc_advskew;
863 else
864 advskew = 240;
865 tv.tv_sec = advbase;
866 tv.tv_usec = advskew * 1000000 / 256;
867 }
868
869 ch.carp_version = CARP_VERSION;
870 ch.carp_type = CARP_ADVERTISEMENT;
871 ch.carp_vhid = sc->sc_vhid;
872 ch.carp_advbase = advbase;
873 ch.carp_advskew = advskew;
874 ch.carp_authlen = 7; /* XXX DEFINE */
875 ch.carp_pad1 = 0; /* must be zero */
876 ch.carp_cksum = 0;
877
878 #ifdef INET
879 if (sc->sc_ia) {
880 struct ip *ip;
881
882 MGETHDR(m, M_NOWAIT, MT_HEADER);
883 if (m == NULL) {
884 SC2IFP(sc)->if_oerrors++;
885 carpstats.carps_onomem++;
886 /* XXX maybe less ? */
887 if (advbase != 255 || advskew != 255)
888 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
889 carp_send_ad, sc);
890 return;
891 }
892 len = sizeof(*ip) + sizeof(ch);
893 m->m_pkthdr.len = len;
894 m->m_pkthdr.rcvif = NULL;
895 m->m_len = len;
896 MH_ALIGN(m, m->m_len);
897 m->m_flags |= M_MCAST;
898 ip = mtod(m, struct ip *);
899 ip->ip_v = IPVERSION;
900 ip->ip_hl = sizeof(*ip) >> 2;
901 ip->ip_tos = IPTOS_LOWDELAY;
902 ip->ip_len = len;
903 ip->ip_id = ip_newid();
904 ip->ip_off = IP_DF;
905 ip->ip_ttl = CARP_DFLTTL;
906 ip->ip_p = IPPROTO_CARP;
907 ip->ip_sum = 0;
908 ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr;
909 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
910
911 ch_ptr = (struct carp_header *)(&ip[1]);
912 bcopy(&ch, ch_ptr, sizeof(ch));
913 if (carp_prepare_ad(m, sc, ch_ptr))
914 return;
915
916 m->m_data += sizeof(*ip);
917 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip));
918 m->m_data -= sizeof(*ip);
919
920 getmicrotime(&SC2IFP(sc)->if_lastchange);
921 SC2IFP(sc)->if_opackets++;
922 SC2IFP(sc)->if_obytes += len;
923 carpstats.carps_opackets++;
924
925 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) {
926 SC2IFP(sc)->if_oerrors++;
927 if (sc->sc_sendad_errors < INT_MAX)
928 sc->sc_sendad_errors++;
929 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
930 carp_suppress_preempt++;
931 if (carp_suppress_preempt == 1) {
932 CARP_SCUNLOCK(sc);
933 carp_send_ad_all();
934 CARP_SCLOCK(sc);
935 }
936 }
937 sc->sc_sendad_success = 0;
938 } else {
939 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
940 if (++sc->sc_sendad_success >=
941 CARP_SENDAD_MIN_SUCCESS) {
942 carp_suppress_preempt--;
943 sc->sc_sendad_errors = 0;
944 }
945 } else
946 sc->sc_sendad_errors = 0;
947 }
948 }
949 #endif /* INET */
950 #ifdef INET6
951 if (sc->sc_ia6) {
952 struct ip6_hdr *ip6;
953
954 MGETHDR(m, M_NOWAIT, MT_HEADER);
955 if (m == NULL) {
956 SC2IFP(sc)->if_oerrors++;
957 carpstats.carps_onomem++;
958 /* XXX maybe less ? */
959 if (advbase != 255 || advskew != 255)
960 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
961 carp_send_ad, sc);
962 return;
963 }
964 len = sizeof(*ip6) + sizeof(ch);
965 m->m_pkthdr.len = len;
966 m->m_pkthdr.rcvif = NULL;
967 m->m_len = len;
968 MH_ALIGN(m, m->m_len);
969 m->m_flags |= M_MCAST;
970 ip6 = mtod(m, struct ip6_hdr *);
971 bzero(ip6, sizeof(*ip6));
972 ip6->ip6_vfc |= IPV6_VERSION;
973 ip6->ip6_hlim = CARP_DFLTTL;
974 ip6->ip6_nxt = IPPROTO_CARP;
975 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src,
976 sizeof(struct in6_addr));
977 /* set the multicast destination */
978
979 ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
980 ip6->ip6_dst.s6_addr8[15] = 0x12;
981 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
982 SC2IFP(sc)->if_oerrors++;
983 m_freem(m);
984 CARP_LOG("%s: in6_setscope failed\n", __func__);
985 return;
986 }
987
988 ch_ptr = (struct carp_header *)(&ip6[1]);
989 bcopy(&ch, ch_ptr, sizeof(ch));
990 if (carp_prepare_ad(m, sc, ch_ptr))
991 return;
992
993 m->m_data += sizeof(*ip6);
994 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6));
995 m->m_data -= sizeof(*ip6);
996
997 getmicrotime(&SC2IFP(sc)->if_lastchange);
998 SC2IFP(sc)->if_opackets++;
999 SC2IFP(sc)->if_obytes += len;
1000 carpstats.carps_opackets6++;
1001
1002 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) {
1003 SC2IFP(sc)->if_oerrors++;
1004 if (sc->sc_sendad_errors < INT_MAX)
1005 sc->sc_sendad_errors++;
1006 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1007 carp_suppress_preempt++;
1008 if (carp_suppress_preempt == 1) {
1009 CARP_SCUNLOCK(sc);
1010 carp_send_ad_all();
1011 CARP_SCLOCK(sc);
1012 }
1013 }
1014 sc->sc_sendad_success = 0;
1015 } else {
1016 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1017 if (++sc->sc_sendad_success >=
1018 CARP_SENDAD_MIN_SUCCESS) {
1019 carp_suppress_preempt--;
1020 sc->sc_sendad_errors = 0;
1021 }
1022 } else
1023 sc->sc_sendad_errors = 0;
1024 }
1025 }
1026 #endif /* INET6 */
1027
1028 if (advbase != 255 || advskew != 255)
1029 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1030 carp_send_ad, sc);
1031
1032 }
1033
1034 /*
1035 * Broadcast a gratuitous ARP request containing
1036 * the virtual router MAC address for each IP address
1037 * associated with the virtual router.
1038 */
1039 static void
1040 carp_send_arp(struct carp_softc *sc)
1041 {
1042 struct ifaddr *ifa;
1043
1044 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1045
1046 if (ifa->ifa_addr->sa_family != AF_INET)
1047 continue;
1048 lwkt_serialize_enter(sc->sc_carpdev->if_serializer);
1049 arp_ifinit2(sc->sc_carpdev, ifa, IF_LLADDR(sc->sc_ifp));
1050 lwkt_serialize_exit(sc->sc_carpdev->if_serializer);
1051
1052 DELAY(1000); /* XXX */
1053 }
1054 }
1055
1056 #ifdef INET6
1057 static void
1058 carp_send_na(struct carp_softc *sc)
1059 {
1060 struct ifaddr *ifa;
1061 struct in6_addr *in6;
1062 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1063
1064 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1065
1066 if (ifa->ifa_addr->sa_family != AF_INET6)
1067 continue;
1068
1069 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
1070 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1071 ND_NA_FLAG_OVERRIDE, 1, NULL);
1072 DELAY(1000); /* XXX */
1073 }
1074 }
1075 #endif /* INET6 */
1076
1077 static int
1078 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type)
1079 {
1080 struct carp_softc *vh;
1081 struct ifaddr *ifa;
1082 int count = 0;
1083
1084 CARP_LOCK_ASSERT(cif);
1085
1086 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1087 if ((type == CARP_COUNT_RUNNING &&
1088 (SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING)) ||
1089 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) {
1090 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist,
1091 ifa_list) {
1092 if (ifa->ifa_addr->sa_family == AF_INET &&
1093 ia->ia_addr.sin_addr.s_addr ==
1094 ifatoia(ifa)->ia_addr.sin_addr.s_addr)
1095 count++;
1096 }
1097 }
1098 }
1099 return (count);
1100 }
1101
1102 int
1103 carp_iamatch(void *v, struct in_ifaddr *ia,
1104 struct in_addr *isaddr, u_int8_t **enaddr)
1105 {
1106 struct carp_if *cif = v;
1107 struct carp_softc *vh;
1108 int index, count = 0;
1109 struct ifaddr *ifa;
1110
1111 CARP_LOCK(cif);
1112
1113 if (carp_opts[CARPCTL_ARPBALANCE]) {
1114 /*
1115 * XXX proof of concept implementation.
1116 * We use the source ip to decide which virtual host should
1117 * handle the request. If we're master of that virtual host,
1118 * then we respond, otherwise, just drop the arp packet on
1119 * the floor.
1120 */
1121 count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING);
1122 if (count == 0) {
1123 /* should never reach this */
1124 CARP_UNLOCK(cif);
1125 return (0);
1126 }
1127
1128 /* this should be a hash, like pf_hash() */
1129 index = ntohl(isaddr->s_addr) % count;
1130 count = 0;
1131
1132 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1133 if ((SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING)) {
1134 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist,
1135 ifa_list) {
1136 if (ifa->ifa_addr->sa_family ==
1137 AF_INET &&
1138 ia->ia_addr.sin_addr.s_addr ==
1139 ifatoia(ifa)->ia_addr.sin_addr.s_addr) {
1140 if (count == index) {
1141 if (vh->sc_state ==
1142 MASTER) {
1143 *enaddr = IF_LLADDR(vh->sc_ifp);
1144 CARP_UNLOCK(cif);
1145 return (1);
1146 } else {
1147 CARP_UNLOCK(cif);
1148 return (0);
1149 }
1150 }
1151 count++;
1152 }
1153 }
1154 }
1155 }
1156 } else {
1157 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1158 if ((SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING) &&
1159 vh->sc_state == MASTER) {
1160 *enaddr = IF_LLADDR(vh->sc_ifp);
1161 CARP_UNLOCK(cif);
1162 return (1);
1163 }
1164 }
1165 }
1166 CARP_UNLOCK(cif);
1167 return(0);
1168 }
1169
1170 #ifdef INET6
1171 struct ifaddr *
1172 carp_iamatch6(void *v, struct in6_addr *taddr)
1173 {
1174 struct carp_if *cif = v;
1175 struct carp_softc *vh;
1176 struct ifaddr *ifa;
1177
1178 CARP_LOCK(cif);
1179 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1180 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, ifa_list) {
1181 if (IN6_ARE_ADDR_EQUAL(taddr,
1182 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1183 (SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING) &&
1184 vh->sc_state == MASTER) {
1185 CARP_UNLOCK(cif);
1186 return (ifa);
1187 }
1188 }
1189 }
1190 CARP_UNLOCK(cif);
1191
1192 return (NULL);
1193 }
1194
1195 void *
1196 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr)
1197 {
1198 struct m_tag *mtag;
1199 struct carp_if *cif = v;
1200 struct carp_softc *sc;
1201 struct ifaddr *ifa;
1202
1203 CARP_LOCK(cif);
1204 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
1205 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1206 if (IN6_ARE_ADDR_EQUAL(taddr,
1207 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1208 (SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING)) {
1209 struct ifnet *ifp = SC2IFP(sc);
1210 mtag = m_tag_get(PACKET_TAG_CARP,
1211 sizeof(struct ifnet *), MB_DONTWAIT);
1212 if (mtag == NULL) {
1213 /* better a bit than nothing */
1214 CARP_UNLOCK(cif);
1215 return (IF_LLADDR(sc->sc_ifp));
1216 }
1217 bcopy(&ifp, (caddr_t)(mtag + 1),
1218 sizeof(struct ifnet *));
1219 m_tag_prepend(m, mtag);
1220
1221 CARP_UNLOCK(cif);
1222 return (IF_LLADDR(sc->sc_ifp));
1223 }
1224 }
1225 }
1226 CARP_UNLOCK(cif);
1227
1228 return (NULL);
1229 }
1230 #endif
1231
1232 struct ifnet *
1233 carp_forus(void *v, void *dhost)
1234 {
1235 struct carp_if *cif = v;
1236 struct carp_softc *vh;
1237 u_int8_t *ena = dhost;
1238
1239 /**
1240 * XXX: See here for check on MAC adr is not for virtual use
1241 *
1242 **/
1243
1244 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
1245 {
1246 return (NULL);
1247 }
1248
1249 CARP_LOCK(cif);
1250 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list)
1251 if ((SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING) &&
1252 vh->sc_state == MASTER &&
1253 !bcmp(dhost, IF_LLADDR(vh->sc_ifp), ETHER_ADDR_LEN)) {
1254 CARP_UNLOCK(cif);
1255 return (SC2IFP(vh));
1256 }
1257
1258 CARP_UNLOCK(cif);
1259 return (NULL);
1260 }
1261
1262 static void
1263 carp_master_down(void *v)
1264 {
1265 struct carp_softc *sc = v;
1266
1267 lwkt_serialize_enter(sc->sc_ifp->if_serializer);
1268 carp_master_down_locked(sc);
1269 lwkt_serialize_exit(sc->sc_ifp->if_serializer);
1270 }
1271
1272 static void
1273 carp_master_down_locked(struct carp_softc *sc)
1274 {
1275 if (sc->sc_carpdev)
1276 CARP_SCLOCK_ASSERT(sc);
1277
1278 switch (sc->sc_state) {
1279 case INIT:
1280 kprintf("%s: master_down event in INIT state\n",
1281 SC2IFP(sc)->if_xname);
1282 break;
1283 case MASTER:
1284 break;
1285 case BACKUP:
1286 carp_set_state(sc, MASTER);
1287 carp_send_ad_locked(sc);
1288 carp_send_arp(sc);
1289 #ifdef INET6
1290 carp_send_na(sc);
1291 #endif /* INET6 */
1292 carp_setrun(sc, 0);
1293 carp_setroute(sc, RTM_ADD);
1294 break;
1295 }
1296 }
1297
1298 /*
1299 * When in backup state, af indicates whether to reset the master down timer
1300 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1301 */
1302 static void
1303 carp_setrun(struct carp_softc *sc, sa_family_t af)
1304 {
1305 struct timeval tv;
1306
1307 if (sc->sc_carpdev == NULL) {
1308 SC2IFP(sc)->if_flags &= ~IFF_RUNNING;
1309 carp_set_state(sc, INIT);
1310 return;
1311 }
1312
1313 if (SC2IFP(sc)->if_flags & IFF_UP &&
1314 sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6))
1315 SC2IFP(sc)->if_flags |= IFF_RUNNING;
1316 else {
1317 SC2IFP(sc)->if_flags &= ~IFF_RUNNING;
1318 carp_setroute(sc, RTM_DELETE);
1319 return;
1320 }
1321
1322 switch (sc->sc_state) {
1323 case INIT:
1324 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) {
1325 carp_send_ad_locked(sc);
1326 carp_send_arp(sc);
1327 #ifdef INET6
1328 carp_send_na(sc);
1329 #endif /* INET6 */
1330 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n",
1331 SC2IFP(sc)->if_xname);
1332 carp_set_state(sc, MASTER);
1333 carp_setroute(sc, RTM_ADD);
1334 } else {
1335 CARP_DEBUG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname);
1336 carp_set_state(sc, BACKUP);
1337 carp_setroute(sc, RTM_DELETE);
1338 carp_setrun(sc, 0);
1339 }
1340 break;
1341 case BACKUP:
1342 callout_stop(&sc->sc_ad_tmo);
1343 tv.tv_sec = 3 * sc->sc_advbase;
1344 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1345 switch (af) {
1346 #ifdef INET
1347 case AF_INET:
1348 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
1349 carp_master_down, sc);
1350 break;
1351 #endif /* INET */
1352 #ifdef INET6
1353 case AF_INET6:
1354 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
1355 carp_master_down, sc);
1356 break;
1357 #endif /* INET6 */
1358 default:
1359 if (sc->sc_naddrs)
1360 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
1361 carp_master_down, sc);
1362 if (sc->sc_naddrs6)
1363 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
1364 carp_master_down, sc);
1365 break;
1366 }
1367 break;
1368 case MASTER:
1369 tv.tv_sec = sc->sc_advbase;
1370 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1371 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1372 carp_send_ad, sc);
1373 break;
1374 }
1375 }
1376
1377 static void
1378 carp_multicast_cleanup(struct carp_softc *sc)
1379 {
1380 struct ip_moptions *imo = &sc->sc_imo;
1381 u_int16_t n = imo->imo_num_memberships;
1382
1383 /* Clean up our own multicast memberships */
1384 while (n-- > 0) {
1385 if (imo->imo_membership[n] != NULL) {
1386 in_delmulti(imo->imo_membership[n]);
1387 imo->imo_membership[n] = NULL;
1388 }
1389 }
1390 imo->imo_num_memberships = 0;
1391 imo->imo_multicast_ifp = NULL;
1392 }
1393
1394 #ifdef INET6
1395 static void
1396 carp_multicast6_cleanup(struct carp_softc *sc)
1397 {
1398 struct ip6_moptions *im6o = &sc->sc_im6o;
1399
1400 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1401 struct in6_multi_mship *imm =
1402 LIST_FIRST(&im6o->im6o_memberships);
1403
1404 LIST_REMOVE(imm, i6mm_chain);
1405 in6_leavegroup(imm);
1406 }
1407 im6o->im6o_multicast_ifp = NULL;
1408 }
1409 #endif
1410
1411 static int
1412 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1413 {
1414 struct ifnet *ifp;
1415 struct carp_if *cif;
1416 struct in_ifaddr *ia, *ia_if;
1417 struct ip_moptions *imo = &sc->sc_imo;
1418 struct in_addr addr;
1419 u_long iaddr = htonl(sin->sin_addr.s_addr);
1420 int own, error;
1421
1422 if (sin->sin_addr.s_addr == 0)
1423 {
1424 if (!(SC2IFP(sc)->if_flags & IFF_UP))
1425 {
1426 carp_set_state(sc, INIT);
1427 }
1428 if (sc->sc_naddrs)
1429 {
1430 SC2IFP(sc)->if_flags |= IFF_UP;
1431 }
1432 carp_setrun(sc, 0);
1433 return (0);
1434 }
1435 /* we have to do it by hands to check we won't match on us */
1436 ia_if = NULL; own = 0;
1437 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
1438 /* and, yeah, we need a multicast-capable iface too */
1439 if (ia->ia_ifp != SC2IFP(sc) &&
1440 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1441 (iaddr & ia->ia_subnetmask) == ia->ia_subnet) {
1442 if (!ia_if)
1443 ia_if = ia;
1444 if (sin->sin_addr.s_addr ==
1445 ia->ia_addr.sin_addr.s_addr)
1446 own++;
1447 }
1448 }
1449
1450
1451 if (!ia_if)
1452 return (EADDRNOTAVAIL);
1453
1454 ia = ia_if;
1455 ifp = ia->ia_ifp;
1456
1457 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1458 (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp))
1459 return (EADDRNOTAVAIL);
1460
1461 if (imo->imo_num_memberships == 0) {
1462 addr.s_addr = htonl(INADDR_CARP_GROUP);
1463 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL)
1464 return (ENOBUFS);
1465 imo->imo_num_memberships++;
1466 imo->imo_multicast_ifp = ifp;
1467 imo->imo_multicast_ttl = CARP_DFLTTL;
1468 imo->imo_multicast_loop = 0;
1469 }
1470
1471 if (!ifp->if_carp) {
1472
1473 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP,
1474 M_WAITOK|M_ZERO);
1475 if ((error = ifpromisc(ifp, 1))) {
1476 FREE(cif, M_CARP);
1477 goto cleanup;
1478 }
1479
1480 CARP_LOCK_INIT(cif);
1481 CARP_LOCK(cif);
1482 cif->vhif_ifp = ifp;
1483 TAILQ_INIT(&cif->vhif_vrs);
1484 ifp->if_carp = cif;
1485
1486 } else {
1487 struct carp_softc *vr;
1488
1489 cif = (struct carp_if *)ifp->if_carp;
1490 CARP_LOCK(cif);
1491 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1492 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1493 CARP_UNLOCK(cif);
1494 error = EINVAL;
1495 goto cleanup;
1496 }
1497 }
1498 sc->sc_ia = ia;
1499 sc->sc_carpdev = ifp;
1500
1501 { /* XXX prevent endless loop if already in queue */
1502 struct carp_softc *vr, *after = NULL;
1503 int myself = 0;
1504 cif = (struct carp_if *)ifp->if_carp;
1505
1506 /* XXX: cif should not change, right? So we still hold the lock */
1507 CARP_LOCK_ASSERT(cif);
1508
1509 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1510 if (vr == sc)
1511 myself = 1;
1512 if (vr->sc_vhid < sc->sc_vhid)
1513 after = vr;
1514 }
1515
1516 if (!myself) {
1517 /* We're trying to keep things in order */
1518 if (after == NULL) {
1519 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1520 } else {
1521 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1522 }
1523 cif->vhif_nvrs++;
1524 }
1525 }
1526
1527 sc->sc_naddrs++;
1528 SC2IFP(sc)->if_flags |= IFF_UP;
1529 if (own)
1530 sc->sc_advskew = 0;
1531
1532
1533 carp_sc_state_locked(sc);
1534 carp_setrun(sc, 0);
1535
1536 CARP_UNLOCK(cif);
1537
1538 return (0);
1539
1540 cleanup:
1541 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1542 return (error);
1543
1544 }
1545
1546 static int
1547 carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1548 {
1549 int error = 0;
1550
1551 if (!--sc->sc_naddrs) {
1552 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1553 struct ip_moptions *imo = &sc->sc_imo;
1554
1555 CARP_LOCK(cif);
1556 callout_stop(&sc->sc_ad_tmo);
1557 SC2IFP(sc)->if_flags &= ~IFF_UP;
1558 SC2IFP(sc)->if_flags &= ~IFF_RUNNING;
1559 sc->sc_vhid = -1;
1560 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1561 imo->imo_multicast_ifp = NULL;
1562 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1563 if (!--cif->vhif_nvrs) {
1564 sc->sc_carpdev->if_carp = NULL;
1565 CARP_LOCK_DESTROY(cif);
1566 FREE(cif, M_IFADDR);
1567 } else {
1568 CARP_UNLOCK(cif);
1569 }
1570 }
1571
1572 return (error);
1573 }
1574
1575 #ifdef INET6
1576 static int
1577 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1578 {
1579 struct ifnet *ifp;
1580 struct carp_if *cif;
1581 struct in6_ifaddr *ia, *ia_if;
1582 struct ip6_moptions *im6o = &sc->sc_im6o;
1583 struct in6_multi_mship *imm;
1584 struct in6_addr in6;
1585 int own, error;
1586
1587 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1588 if (!(SC2IFP(sc)->if_flags & IFF_UP))
1589 carp_set_state(sc, INIT);
1590 if (sc->sc_naddrs6)
1591 SC2IFP(sc)->if_flags |= IFF_UP;
1592 carp_setrun(sc, 0);
1593 return (0);
1594 }
1595
1596 /* we have to do it by hands to check we won't match on us */
1597 ia_if = NULL; own = 0;
1598 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1599 int i;
1600
1601 for (i = 0; i < 4; i++) {
1602 if ((sin6->sin6_addr.s6_addr32[i] &
1603 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
1604 (ia->ia_addr.sin6_addr.s6_addr32[i] &
1605 ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
1606 break;
1607 }
1608 /* and, yeah, we need a multicast-capable iface too */
1609 if (ia->ia_ifp != SC2IFP(sc) &&
1610 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1611 (i == 4)) {
1612 if (!ia_if)
1613 ia_if = ia;
1614 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
1615 &ia->ia_addr.sin6_addr))
1616 own++;
1617 }
1618 }
1619
1620 if (!ia_if)
1621 return (EADDRNOTAVAIL);
1622 ia = ia_if;
1623 ifp = ia->ia_ifp;
1624
1625 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1626 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp))
1627 return (EADDRNOTAVAIL);
1628
1629 if (!sc->sc_naddrs6) {
1630 im6o->im6o_multicast_ifp = ifp;
1631
1632 /* join CARP multicast address */
1633 bzero(&in6, sizeof(in6));
1634 in6.s6_addr16[0] = htons(0xff02);
1635 in6.s6_addr8[15] = 0x12;
1636 if (in6_setscope(&in6, ifp, NULL) != 0)
1637 goto cleanup;
1638 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
1639 goto cleanup;
1640 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1641
1642 /* join solicited multicast address */
1643 bzero(&in6, sizeof(in6));
1644 in6.s6_addr16[0] = htons(0xff02);
1645 in6.s6_addr32[1] = 0;
1646 in6.s6_addr32[2] = htonl(1);
1647 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3];
1648 in6.s6_addr8[12] = 0xff;
1649 if (in6_setscope(&in6, ifp, NULL) != 0)
1650 goto cleanup;
1651 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
1652 goto cleanup;
1653 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1654 }
1655
1656 if (!ifp->if_carp) {
1657 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP,
1658 M_WAITOK|M_ZERO);
1659 if ((error = ifpromisc(ifp, 1))) {
1660 FREE(cif, M_CARP);
1661 goto cleanup;
1662 }
1663
1664 CARP_LOCK_INIT(cif);
1665 CARP_LOCK(cif);
1666 cif->vhif_ifp = ifp;
1667 TAILQ_INIT(&cif->vhif_vrs);
1668 ifp->if_carp = cif;
1669
1670 } else {
1671 struct carp_softc *vr;
1672
1673 cif = (struct carp_if *)ifp->if_carp;
1674 CARP_LOCK(cif);
1675 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1676 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1677 CARP_UNLOCK(cif);
1678 error = EINVAL;
1679 goto cleanup;
1680 }
1681 }
1682 sc->sc_ia6 = ia;
1683 sc->sc_carpdev = ifp;
1684
1685 { /* XXX prevent endless loop if already in queue */
1686 struct carp_softc *vr, *after = NULL;
1687 int myself = 0;
1688 cif = (struct carp_if *)ifp->if_carp;
1689 CARP_LOCK_ASSERT(cif);
1690
1691 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1692 if (vr == sc)
1693 myself = 1;
1694 if (vr->sc_vhid < sc->sc_vhid)
1695 after = vr;
1696 }
1697
1698 if (!myself) {
1699 /* We're trying to keep things in order */
1700 if (after == NULL) {
1701 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1702 } else {
1703 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1704 }
1705 cif->vhif_nvrs++;
1706 }
1707 }
1708
1709 sc->sc_naddrs6++;
1710 SC2IFP(sc)->if_flags |= IFF_UP;
1711 if (own)
1712 sc->sc_advskew = 0;
1713 carp_sc_state_locked(sc);
1714 carp_setrun(sc, 0);
1715
1716 CARP_UNLOCK(cif);
1717
1718 return (0);
1719
1720 cleanup:
1721 /* clean up multicast memberships */
1722 if (!sc->sc_naddrs6) {
1723 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1724 imm = LIST_FIRST(&im6o->im6o_memberships);
1725 LIST_REMOVE(imm, i6mm_chain);
1726 in6_leavegroup(imm);
1727 }
1728 }
1729 return (error);
1730 }
1731
1732 static int
1733 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1734 {
1735 int error = 0;
1736
1737 if (!--sc->sc_naddrs6) {
1738 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1739 struct ip6_moptions *im6o = &sc->sc_im6o;
1740
1741 CARP_LOCK(cif);
1742 callout_stop(&sc->sc_ad_tmo);
1743 SC2IFP(sc)->if_flags &= ~IFF_UP;
1744 SC2IFP(sc)->if_flags &= ~IFF_RUNNING;
1745 sc->sc_vhid = -1;
1746 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1747 struct in6_multi_mship *imm =
1748 LIST_FIRST(&im6o->im6o_memberships);
1749
1750 LIST_REMOVE(imm, i6mm_chain);
1751 in6_leavegroup(imm);
1752 }
1753 im6o->im6o_multicast_ifp = NULL;
1754 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1755 if (!--cif->vhif_nvrs) {
1756 CARP_LOCK_DESTROY(cif);
1757 sc->sc_carpdev->if_carp = NULL;
1758 FREE(cif, M_IFADDR);
1759 } else
1760 CARP_UNLOCK(cif);
1761 }
1762
1763 return (error);
1764 }
1765 #endif /* INET6 */
1766
1767 static int
1768 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr, struct ucred *creds)
1769 {
1770 struct carp_softc *sc = ifp->if_softc, *vr;
1771 struct carpreq carpr;
1772 struct ifaddr *ifa;
1773 struct ifreq *ifr;
1774 struct ifaliasreq *ifra;
1775 int locked = 0, error = 0;
1776
1777 ifa = (struct ifaddr *)addr;
1778 ifra = (struct ifaliasreq *)addr;
1779 ifr = (struct ifreq *)addr;
1780
1781
1782 switch (cmd) {
1783 case SIOCSIFADDR:
1784 switch (ifa->ifa_addr->sa_family) {
1785 #ifdef INET
1786 case AF_INET:
1787 SC2IFP(sc)->if_flags |= IFF_UP;
1788 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1789 sizeof(struct sockaddr));
1790 error = carp_set_addr(sc, satosin(ifa->ifa_addr));
1791 break;
1792 #endif /* INET */
1793 #ifdef INET6
1794 case AF_INET6:
1795 SC2IFP(sc)->if_flags |= IFF_UP;
1796 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr));
1797 break;
1798 #endif /* INET6 */
1799 default:
1800 error = EAFNOSUPPORT;
1801 break;
1802 }
1803 break;
1804
1805 case SIOCAIFADDR:
1806 switch (ifa->ifa_addr->sa_family) {
1807 #ifdef INET
1808 case AF_INET:
1809 SC2IFP(sc)->if_flags |= IFF_UP;
1810 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1811 sizeof(struct sockaddr));
1812 error = carp_set_addr(sc, satosin(&ifra->ifra_addr));
1813 break;
1814 #endif /* INET */
1815 #ifdef INET6
1816 case AF_INET6:
1817 SC2IFP(sc)->if_flags |= IFF_UP;
1818 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr));
1819 break;
1820 #endif /* INET6 */
1821 default:
1822 error = EAFNOSUPPORT;
1823 break;
1824 }
1825 break;
1826
1827 case SIOCDIFADDR:
1828 switch (ifa->ifa_addr->sa_family) {
1829 #ifdef INET
1830 case AF_INET:
1831 error = carp_del_addr(sc, satosin(&ifra->ifra_addr));
1832 break;
1833 #endif /* INET */
1834 #ifdef INET6
1835 case AF_INET6:
1836 error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr));
1837 break;
1838 #endif /* INET6 */
1839 default:
1840 error = EAFNOSUPPORT;
1841 break;
1842 }
1843 break;
1844
1845 case SIOCSIFFLAGS:
1846 if (sc->sc_carpdev) {
1847 locked = 1;
1848 CARP_SCLOCK(sc);
1849 }
1850 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) {
1851 callout_stop(&sc->sc_ad_tmo);
1852 callout_stop(&sc->sc_md_tmo);
1853 callout_stop(&sc->sc_md6_tmo);
1854 if (sc->sc_state == MASTER)
1855 carp_send_ad_locked(sc);
1856 carp_set_state(sc, INIT);
1857 carp_setrun(sc, 0);
1858 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) {
1859 SC2IFP(sc)->if_flags |= IFF_UP;
1860 carp_setrun(sc, 0);
1861 }
1862 break;
1863
1864 case SIOCSVH:
1865 error = suser(curthread);
1866 if (error)
1867 break;
1868 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr)))
1869 break;
1870 error = 1;
1871 if (sc->sc_carpdev) {
1872 locked = 1;
1873 CARP_SCLOCK(sc);
1874 }
1875 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) {
1876 switch (carpr.carpr_state) {
1877 case BACKUP:
1878 callout_stop(&sc->sc_ad_tmo);
1879 carp_set_state(sc, BACKUP);
1880 carp_setrun(sc, 0);
1881 carp_setroute(sc, RTM_DELETE);
1882 break;
1883 case MASTER:
1884 carp_master_down_locked(sc);
1885 break;
1886 default:
1887 break;
1888 }
1889 }
1890 if (carpr.carpr_vhid > 0) {
1891 if (carpr.carpr_vhid > 255) {
1892 error = EINVAL;
1893 break;
1894 }
1895 if (sc->sc_carpdev) {
1896 struct carp_if *cif;
1897 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1898 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1899 if (vr != sc &&
1900 vr->sc_vhid == carpr.carpr_vhid)
1901 return EEXIST;
1902 }
1903 sc->sc_vhid = carpr.carpr_vhid;
1904 IF_LLADDR(sc->sc_ifp)[0] = 0;
1905 IF_LLADDR(sc->sc_ifp)[1] = 0;
1906 IF_LLADDR(sc->sc_ifp)[2] = 0x5e;
1907 IF_LLADDR(sc->sc_ifp)[3] = 0;
1908 IF_LLADDR(sc->sc_ifp)[4] = 1;
1909 IF_LLADDR(sc->sc_ifp)[5] = sc->sc_vhid;
1910 error--;
1911 }
1912 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) {
1913 if (carpr.carpr_advskew >= 255) {
1914 error = EINVAL;
1915 break;
1916 }
1917 if (carpr.carpr_advbase > 255) {
1918 error = EINVAL;
1919 break;
1920 }
1921 sc->sc_advbase = carpr.carpr_advbase;
1922 sc->sc_advskew = carpr.carpr_advskew;
1923 error--;
1924 }
1925 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key));
1926 if (error > 0)
1927 error = EINVAL;
1928 else {
1929 error = 0;
1930 carp_setrun(sc, 0);
1931 }
1932 break;
1933
1934 case SIOCGVH:
1935 /* XXX: lockless read */
1936 bzero(&carpr, sizeof(carpr));
1937 carpr.carpr_state = sc->sc_state;
1938 carpr.carpr_vhid = sc->sc_vhid;
1939 carpr.carpr_advbase = sc->sc_advbase;
1940 carpr.carpr_advskew = sc->sc_advskew;
1941 error = suser(curthread);
1942 if (error == 0)
1943 bcopy(sc->sc_key, carpr.carpr_key,
1944 sizeof(carpr.carpr_key));
1945 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
1946 break;
1947
1948 default:
1949 error = EINVAL;
1950 }
1951
1952 if (locked)
1953 CARP_SCUNLOCK(sc);
1954
1955 carp_hmac_prepare(sc);
1956
1957 return (error);
1958 }
1959
1960 /*
1961 * XXX: this is looutput. We should eventually use it from there.
1962 */
1963 static int
1964 carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
1965 struct rtentry *rt)
1966 {
1967 u_int32_t af;
1968
1969 M_ASSERTPKTHDR(m); /* check if we have the packet header */
1970
1971 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
1972 m_freem(m);
1973 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
1974 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
1975 }
1976
1977 ifp->if_opackets++;
1978 ifp->if_obytes += m->m_pkthdr.len;
1979
1980 /* BPF writes need to be handled specially. */
1981 if (dst->sa_family == AF_UNSPEC) {
1982 bcopy(dst->sa_data, &af, sizeof(af));
1983 dst->sa_family = af;
1984 }
1985
1986 #if 1 /* XXX */
1987 switch (dst->sa_family) {
1988 case AF_INET:
1989 case AF_INET6:
1990 case AF_IPX:
1991 case AF_APPLETALK:
1992 break;
1993 default:
1994 m_freem(m);
1995 return (EAFNOSUPPORT);
1996 }
1997 #endif
1998 return(if_simloop(ifp, m, dst->sa_family, 0));
1999 }
2000
2001 /*
2002 * Start output on carp interface. This function should never be called.
2003 */
2004 static void
2005 carp_start(struct ifnet *ifp)
2006 {
2007 #ifdef DEBUG
2008 kprintf("%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 m_tag *mtag;
2017 struct carp_softc *sc;
2018 struct ifnet *carp_ifp;
2019
2020 if (!sa)
2021 return (0);
2022
2023 switch (sa->sa_family) {
2024 #ifdef INET
2025 case AF_INET:
2026 break;
2027 #endif /* INET */
2028 #ifdef INET6
2029 case AF_INET6:
2030 break;
2031 #endif /* INET6 */
2032 default:
2033 return (0);
2034 }
2035
2036 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL);
2037 if (mtag == NULL)
2038 return (0);
2039
2040 bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *));
2041 sc = carp_ifp->if_softc;
2042
2043 /* Set the source MAC address to Virtual Router MAC Address */
2044 switch (ifp->if_type) {
2045 case IFT_ETHER:
2046 case IFT_L2VLAN: {
2047 struct ether_header *eh;
2048
2049 eh = mtod(m, struct ether_header *);
2050 eh->ether_shost[0] = 0;
2051 eh->ether_shost[1] = 0;
2052 eh->ether_shost[2] = 0x5e;
2053 eh->ether_shost[3] = 0;
2054 eh->ether_shost[4] = 1;
2055 eh->ether_shost[5] = sc->sc_vhid;
2056 }
2057 break;
2058 default:
2059 kprintf("%s: carp is not supported for this interface type\n",
2060 ifp->if_xname);
2061 return (EOPNOTSUPP);
2062 }
2063
2064 return (0);
2065
2066 }
2067
2068 static void
2069 carp_set_state(struct carp_softc *sc, int state)
2070 {
2071
2072 if (sc->sc_carpdev)
2073 CARP_SCLOCK_ASSERT(sc);
2074
2075 if (sc->sc_state == state)
2076 return;
2077
2078 sc->sc_state = state;
2079 switch (state) {
2080 case BACKUP:
2081 SC2IFP(sc)->if_link_state = LINK_STATE_DOWN;
2082 break;
2083 case MASTER:
2084 SC2IFP(sc)->if_link_state = LINK_STATE_UP;
2085 break;
2086 default:
2087 SC2IFP(sc)->if_link_state = LINK_STATE_UNKNOWN;
2088 break;
2089 }
2090 rt_ifmsg(SC2IFP(sc));
2091 }
2092
2093 void
2094 carp_carpdev_state(void *v)
2095 {
2096 struct carp_if *cif = v;
2097
2098 CARP_LOCK(cif);
2099 carp_carpdev_state_locked(cif);
2100 CARP_UNLOCK(cif);
2101 }
2102
2103 static void
2104 carp_carpdev_state_locked(struct carp_if *cif)
2105 {
2106 struct carp_softc *sc;
2107
2108 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
2109 carp_sc_state_locked(sc);
2110 }
2111
2112 static void
2113 carp_sc_state_locked(struct carp_softc *sc)
2114 {
2115 CARP_SCLOCK_ASSERT(sc);
2116
2117 if ( !(sc->sc_carpdev->if_flags & IFF_UP)) {
2118 sc->sc_flags_backup = SC2IFP(sc)->if_flags;
2119 SC2IFP(sc)->if_flags &= ~IFF_UP;
2120 SC2IFP(sc)->if_flags &= ~IFF_RUNNING;
2121 callout_stop(&sc->sc_ad_tmo);
2122 callout_stop(&sc->sc_md_tmo);
2123 callout_stop(&sc->sc_md6_tmo);
2124 carp_set_state(sc, INIT);
2125 carp_setrun(sc, 0);
2126 if (!sc->sc_suppress) {
2127 carp_suppress_preempt++;
2128 if (carp_suppress_preempt == 1) {
2129 CARP_SCUNLOCK(sc);
2130 carp_send_ad_all();
2131 CARP_SCLOCK(sc);
2132 }
2133 }
2134 sc->sc_suppress = 1;
2135 } else {
2136 SC2IFP(sc)->if_flags |= sc->sc_flags_backup;
2137 carp_set_state(sc, INIT);
2138 carp_setrun(sc, 0);
2139 if (sc->sc_suppress)
2140 carp_suppress_preempt--;
2141 sc->sc_suppress = 0;
2142 }
2143
2144 return;
2145 }
2146
2147 static int
2148 carp_modevent(module_t mod, int type, void *data)
2149 {
2150 switch (type) {
2151 case MOD_LOAD:
2152 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
2153 carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY);
2154 if (if_detach_event_tag == NULL)
2155 return (ENOMEM);
2156
2157 LIST_INIT(&carpif_list);
2158 if_clone_attach(&carp_cloner);
2159 break;
2160
2161 case MOD_UNLOAD:
2162 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag);
2163 if_clone_detach(&carp_cloner);
2164 break;
2165
2166 default:
2167 return (EINVAL);
2168 }
2169
2170 return (0);
2171 }
2172
2173 static moduledata_t carp_mod = {
2174 "carp",
2175 carp_modevent,
2176 0
2177 };
2178
2179 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
DragonFly BSD