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arcmsr(4): Use MSI if it is supported by the device.
[dragonfly.git] / sys / netinet / ip_carp.c
blob03f73946f3d808575f4b72b87d0d879794d7fe43
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 */
29
30 #include "opt_carp.h"
31 #include "opt_inet.h"
32 #include "opt_inet6.h"
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/in_cksum.h>
38 #include <sys/limits.h>
39 #include <sys/malloc.h>
40 #include <sys/mbuf.h>
41 #include <sys/msgport2.h>
42 #include <sys/time.h>
43 #include <sys/proc.h>
44 #include <sys/priv.h>
45 #include <sys/sockio.h>
46 #include <sys/socket.h>
47 #include <sys/sysctl.h>
48 #include <sys/syslog.h>
49 #include <sys/thread.h>
50
51 #include <machine/stdarg.h>
52 #include <crypto/sha1.h>
53
54 #include <net/bpf.h>
55 #include <net/ethernet.h>
56 #include <net/if.h>
57 #include <net/if_dl.h>
58 #include <net/if_types.h>
59 #include <net/route.h>
60 #include <net/if_clone.h>
61 #include <net/if_var.h>
62 #include <net/ifq_var.h>
63 #include <net/netmsg2.h>
64
65 #ifdef INET
66 #include <netinet/in.h>
67 #include <netinet/in_var.h>
68 #include <netinet/in_systm.h>
69 #include <netinet/ip.h>
70 #include <netinet/ip_var.h>
71 #include <netinet/if_ether.h>
72 #endif
73
74 #ifdef INET6
75 #include <netinet/icmp6.h>
76 #include <netinet/ip6.h>
77 #include <netinet6/ip6_var.h>
78 #include <netinet6/scope6_var.h>
79 #include <netinet6/nd6.h>
80 #endif
81
82 #include <netinet/ip_carp.h>
83
84 #define CARP_IFNAME "carp"
85 #define CARP_IS_RUNNING(ifp) \
86 (((ifp)->if_flags & (IFF_UP | IFF_RUNNING)) == (IFF_UP | IFF_RUNNING))
87
88 struct carp_vhaddr {
89 uint32_t vha_flags; /* CARP_VHAF_ */
90 struct in_ifaddr *vha_ia; /* carp address */
91 struct in_ifaddr *vha_iaback; /* backing address */
92 TAILQ_ENTRY(carp_vhaddr) vha_link;
93 };
94 TAILQ_HEAD(carp_vhaddr_list, carp_vhaddr);
95
96 struct carp_softc {
97 struct arpcom arpcom;
98 struct ifnet *sc_carpdev; /* parent interface */
99 struct carp_vhaddr_list sc_vha_list; /* virtual addr list */
100
101 const struct in_ifaddr *sc_ia; /* primary iface address v4 */
102 struct ip_moptions sc_imo;
103
104 #ifdef INET6
105 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */
106 struct ip6_moptions sc_im6o;
107 #endif /* INET6 */
108 TAILQ_ENTRY(carp_softc) sc_list;
109
110 enum { INIT = 0, BACKUP, MASTER }
111 sc_state;
112 int sc_dead;
113
114 int sc_suppress;
115
116 int sc_sendad_errors;
117 #define CARP_SENDAD_MAX_ERRORS 3
118 int sc_sendad_success;
119 #define CARP_SENDAD_MIN_SUCCESS 3
120
121 int sc_vhid;
122 int sc_advskew;
123 int sc_naddrs; /* actually used IPv4 vha */
124 int sc_naddrs6;
125 int sc_advbase; /* seconds */
126 int sc_init_counter;
127 uint64_t sc_counter;
128
129 /* authentication */
130 #define CARP_HMAC_PAD 64
131 unsigned char sc_key[CARP_KEY_LEN];
132 unsigned char sc_pad[CARP_HMAC_PAD];
133 SHA1_CTX sc_sha1;
134
135 struct callout sc_ad_tmo; /* advertisement timeout */
136 struct callout sc_md_tmo; /* master down timeout */
137 struct callout sc_md6_tmo; /* master down timeout */
138
139 LIST_ENTRY(carp_softc) sc_next; /* Interface clue */
140 };
141
142 #define sc_if arpcom.ac_if
143
144 struct carp_if {
145 TAILQ_HEAD(, carp_softc) vhif_vrs;
146 };
147
148 struct netmsg_carp {
149 struct netmsg_base base;
150 struct ifnet *nc_carpdev;
151 struct carp_softc *nc_softc;
152 void *nc_data;
153 size_t nc_datalen;
154 };
155
156 SYSCTL_DECL(_net_inet_carp);
157
158 static int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */
159 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW,
160 &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets");
161 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW,
162 &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode");
163 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW,
164 &carp_opts[CARPCTL_LOG], 0, "log bad carp packets");
165 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW,
166 &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses");
167
168 static int carp_suppress_preempt = 0;
169 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD,
170 &carp_suppress_preempt, 0, "Preemption is suppressed");
171
172 static struct carpstats carpstats;
173 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW,
174 &carpstats, carpstats,
175 "CARP statistics (struct carpstats, netinet/ip_carp.h)");
176
177 #define CARP_LOG(...) do { \
178 if (carp_opts[CARPCTL_LOG] > 0) \
179 log(LOG_INFO, __VA_ARGS__); \
180 } while (0)
181
182 #define CARP_DEBUG(...) do { \
183 if (carp_opts[CARPCTL_LOG] > 1) \
184 log(LOG_DEBUG, __VA_ARGS__); \
185 } while (0)
186
187 static struct lwkt_token carp_tok = LWKT_TOKEN_INITIALIZER(carp_token);
188
189 static void carp_hmac_prepare(struct carp_softc *);
190 static void carp_hmac_generate(struct carp_softc *, uint32_t *,
191 unsigned char *);
192 static int carp_hmac_verify(struct carp_softc *, uint32_t *,
193 unsigned char *);
194 static void carp_setroute(struct carp_softc *, int);
195 static void carp_proto_input_c(struct carp_softc *, struct mbuf *,
196 struct carp_header *, sa_family_t);
197 static int carp_clone_create(struct if_clone *, int, caddr_t);
198 static int carp_clone_destroy(struct ifnet *);
199 static void carp_detach(struct carp_softc *, int, boolean_t);
200 static void carp_prepare_ad(struct carp_softc *, struct carp_header *);
201 static void carp_send_ad_all(void);
202 static void carp_send_ad_timeout(void *);
203 static void carp_send_ad(struct carp_softc *);
204 static void carp_send_arp(struct carp_softc *);
205 static void carp_master_down_timeout(void *);
206 static void carp_master_down(struct carp_softc *);
207 static void carp_setrun(struct carp_softc *, sa_family_t);
208 static void carp_set_state(struct carp_softc *, int);
209 static struct ifnet *carp_forus(struct carp_if *, const uint8_t *);
210
211 static void carp_init(void *);
212 static int carp_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
213 static int carp_output(struct ifnet *, struct mbuf *, struct sockaddr *,
214 struct rtentry *);
215 static void carp_start(struct ifnet *);
216 static void carp_serialize(struct ifnet *, enum ifnet_serialize);
217 static void carp_deserialize(struct ifnet *, enum ifnet_serialize);
218 static int carp_tryserialize(struct ifnet *, enum ifnet_serialize);
219 #ifdef INVARIANTS
220 static void carp_serialize_assert(struct ifnet *, enum ifnet_serialize,
221 boolean_t);
222 #endif
223
224 static void carp_multicast_cleanup(struct carp_softc *);
225 static void carp_add_addr(struct carp_softc *, struct ifaddr *);
226 static void carp_del_addr(struct carp_softc *, struct ifaddr *);
227 static void carp_config_addr(struct carp_softc *, struct ifaddr *);
228 static void carp_link_addrs(struct carp_softc *, struct ifnet *,
229 struct ifaddr *);
230 static void carp_unlink_addrs(struct carp_softc *, struct ifnet *,
231 struct ifaddr *);
232 static void carp_update_addrs(struct carp_softc *, struct ifaddr *);
233
234 static int carp_config_vhaddr(struct carp_softc *, struct carp_vhaddr *,
235 struct in_ifaddr *);
236 static int carp_activate_vhaddr(struct carp_softc *, struct carp_vhaddr *,
237 struct ifnet *, struct in_ifaddr *, int);
238 static void carp_deactivate_vhaddr(struct carp_softc *,
239 struct carp_vhaddr *, boolean_t);
240 static int carp_addroute_vhaddr(struct carp_softc *, struct carp_vhaddr *);
241 static void carp_delroute_vhaddr(struct carp_softc *, struct carp_vhaddr *,
242 boolean_t);
243
244 static void carp_sc_state(struct carp_softc *);
245 #ifdef INET6
246 static void carp_send_na(struct carp_softc *);
247 #ifdef notyet
248 static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *);
249 static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *);
250 #endif
251 static void carp_multicast6_cleanup(struct carp_softc *);
252 #endif
253 static void carp_stop(struct carp_softc *, int);
254 static void carp_suspend(struct carp_softc *, int);
255 static void carp_ioctl_stop(struct carp_softc *);
256 static int carp_ioctl_setvh(struct carp_softc *, void *, struct ucred *);
257 static int carp_ioctl_getvh(struct carp_softc *, void *, struct ucred *);
258 static int carp_ioctl_getdevname(struct carp_softc *, struct ifdrv *);
259 static int carp_ioctl_getvhaddr(struct carp_softc *, struct ifdrv *);
260
261 static void carp_ifaddr(void *, struct ifnet *, enum ifaddr_event,
262 struct ifaddr *);
263 static void carp_ifdetach(void *, struct ifnet *);
264
265 static void carp_ifdetach_dispatch(netmsg_t);
266 static void carp_clone_destroy_dispatch(netmsg_t);
267 static void carp_init_dispatch(netmsg_t);
268 static void carp_ioctl_stop_dispatch(netmsg_t);
269 static void carp_ioctl_setvh_dispatch(netmsg_t);
270 static void carp_ioctl_getvh_dispatch(netmsg_t);
271 static void carp_ioctl_getdevname_dispatch(netmsg_t);
272 static void carp_ioctl_getvhaddr_dispatch(netmsg_t);
273
274 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces");
275
276 static LIST_HEAD(, carp_softc) carpif_list;
277
278 static struct if_clone carp_cloner =
279 IF_CLONE_INITIALIZER(CARP_IFNAME, carp_clone_create, carp_clone_destroy,
280 0, IF_MAXUNIT);
281
282 static uint8_t carp_etheraddr[ETHER_ADDR_LEN] = { 0, 0, 0x5e, 0, 1, 0 };
283
284 static eventhandler_tag carp_ifdetach_event;
285 static eventhandler_tag carp_ifaddr_event;
286
287 static __inline void
288 carp_insert_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha_new)
289 {
290 struct carp_vhaddr *vha;
291 u_long new_addr, addr;
292
293 KKASSERT((vha_new->vha_flags & CARP_VHAF_ONLIST) == 0);
294
295 /*
296 * Virtual address list is sorted; smaller one first
297 */
298 new_addr = ntohl(vha_new->vha_ia->ia_addr.sin_addr.s_addr);
299
300 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
301 addr = ntohl(vha->vha_ia->ia_addr.sin_addr.s_addr);
302
303 if (addr > new_addr)
304 break;
305 }
306 if (vha == NULL)
307 TAILQ_INSERT_TAIL(&sc->sc_vha_list, vha_new, vha_link);
308 else
309 TAILQ_INSERT_BEFORE(vha, vha_new, vha_link);
310 vha_new->vha_flags |= CARP_VHAF_ONLIST;
311 }
312
313 static __inline void
314 carp_remove_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha)
315 {
316 KKASSERT(vha->vha_flags & CARP_VHAF_ONLIST);
317 vha->vha_flags &= ~CARP_VHAF_ONLIST;
318 TAILQ_REMOVE(&sc->sc_vha_list, vha, vha_link);
319 }
320
321 static void
322 carp_hmac_prepare(struct carp_softc *sc)
323 {
324 uint8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
325 uint8_t vhid = sc->sc_vhid & 0xff;
326 int i;
327 #ifdef INET6
328 struct ifaddr_container *ifac;
329 struct in6_addr in6;
330 #endif
331 #ifdef INET
332 struct carp_vhaddr *vha;
333 #endif
334
335 /* XXX: possible race here */
336
337 /* compute ipad from key */
338 bzero(sc->sc_pad, sizeof(sc->sc_pad));
339 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
340 for (i = 0; i < sizeof(sc->sc_pad); i++)
341 sc->sc_pad[i] ^= 0x36;
342
343 /* precompute first part of inner hash */
344 SHA1Init(&sc->sc_sha1);
345 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
346 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
347 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
348 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
349 #ifdef INET
350 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
351 SHA1Update(&sc->sc_sha1,
352 (const uint8_t *)&vha->vha_ia->ia_addr.sin_addr,
353 sizeof(struct in_addr));
354 }
355 #endif /* INET */
356 #ifdef INET6
357 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
358 struct ifaddr *ifa = ifac->ifa;
359
360 if (ifa->ifa_addr->sa_family == AF_INET6) {
361 in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
362 in6_clearscope(&in6);
363 SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6));
364 }
365 }
366 #endif /* INET6 */
367
368 /* convert ipad to opad */
369 for (i = 0; i < sizeof(sc->sc_pad); i++)
370 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
371 }
372
373 static void
374 carp_hmac_generate(struct carp_softc *sc, uint32_t counter[2],
375 unsigned char md[20])
376 {
377 SHA1_CTX sha1ctx;
378
379 /* fetch first half of inner hash */
380 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
381
382 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
383 SHA1Final(md, &sha1ctx);
384
385 /* outer hash */
386 SHA1Init(&sha1ctx);
387 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
388 SHA1Update(&sha1ctx, md, 20);
389 SHA1Final(md, &sha1ctx);
390 }
391
392 static int
393 carp_hmac_verify(struct carp_softc *sc, uint32_t counter[2],
394 unsigned char md[20])
395 {
396 unsigned char md2[20];
397
398 carp_hmac_generate(sc, counter, md2);
399 return (bcmp(md, md2, sizeof(md2)));
400 }
401
402 static void
403 carp_setroute(struct carp_softc *sc, int cmd)
404 {
405 #ifdef INET6
406 struct ifaddr_container *ifac;
407 #endif
408 struct carp_vhaddr *vha;
409
410 KKASSERT(cmd == RTM_DELETE || cmd == RTM_ADD);
411
412 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
413 if (vha->vha_iaback == NULL)
414 continue;
415 if (cmd == RTM_DELETE)
416 carp_delroute_vhaddr(sc, vha, FALSE);
417 else
418 carp_addroute_vhaddr(sc, vha);
419 }
420
421 #ifdef INET6
422 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
423 struct ifaddr *ifa = ifac->ifa;
424
425 if (ifa->ifa_addr->sa_family == AF_INET6) {
426 if (cmd == RTM_ADD)
427 in6_ifaddloop(ifa);
428 else
429 in6_ifremloop(ifa);
430 }
431 }
432 #endif /* INET6 */
433 }
434
435 static int
436 carp_clone_create(struct if_clone *ifc, int unit, caddr_t param __unused)
437 {
438 struct carp_softc *sc;
439 struct ifnet *ifp;
440
441 sc = kmalloc(sizeof(*sc), M_CARP, M_WAITOK | M_ZERO);
442 ifp = &sc->sc_if;
443
444 sc->sc_suppress = 0;
445 sc->sc_advbase = CARP_DFLTINTV;
446 sc->sc_vhid = -1; /* required setting */
447 sc->sc_advskew = 0;
448 sc->sc_init_counter = 1;
449 sc->sc_naddrs = 0;
450 sc->sc_naddrs6 = 0;
451
452 TAILQ_INIT(&sc->sc_vha_list);
453
454 #ifdef INET6
455 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
456 #endif
457
458 callout_init_mp(&sc->sc_ad_tmo);
459 callout_init_mp(&sc->sc_md_tmo);
460 callout_init_mp(&sc->sc_md6_tmo);
461
462 if_initname(ifp, CARP_IFNAME, unit);
463 ifp->if_softc = sc;
464 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
465 ifp->if_init = carp_init;
466 ifp->if_ioctl = carp_ioctl;
467 ifp->if_start = carp_start;
468 ifp->if_serialize = carp_serialize;
469 ifp->if_deserialize = carp_deserialize;
470 ifp->if_tryserialize = carp_tryserialize;
471 #ifdef INVARIANTS
472 ifp->if_serialize_assert = carp_serialize_assert;
473 #endif
474 ifq_set_maxlen(&ifp->if_snd, ifqmaxlen);
475 ifq_set_ready(&ifp->if_snd);
476
477 ether_ifattach(ifp, carp_etheraddr, NULL);
478
479 ifp->if_type = IFT_CARP;
480 ifp->if_output = carp_output;
481
482 carp_gettok();
483 LIST_INSERT_HEAD(&carpif_list, sc, sc_next);
484 carp_reltok();
485
486 return (0);
487 }
488
489 static void
490 carp_clone_destroy_dispatch(netmsg_t msg)
491 {
492 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
493 struct carp_softc *sc = cmsg->nc_softc;
494
495 carp_gettok();
496
497 sc->sc_dead = 1;
498 carp_detach(sc, 1, FALSE);
499
500 carp_reltok();
501
502 lwkt_replymsg(&cmsg->base.lmsg, 0);
503 }
504
505 static int
506 carp_clone_destroy(struct ifnet *ifp)
507 {
508 struct carp_softc *sc = ifp->if_softc;
509 struct netmsg_carp cmsg;
510
511 bzero(&cmsg, sizeof(cmsg));
512 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
513 carp_clone_destroy_dispatch);
514 cmsg.nc_softc = sc;
515
516 lwkt_domsg(cpu_portfn(0), &cmsg.base.lmsg, 0);
517
518 carp_gettok();
519 LIST_REMOVE(sc, sc_next);
520 carp_reltok();
521
522 bpfdetach(ifp);
523 if_detach(ifp);
524
525 KASSERT(sc->sc_naddrs == 0, ("certain inet address is still active\n"));
526 kfree(sc, M_CARP);
527
528 return 0;
529 }
530
531 static void
532 carp_detach(struct carp_softc *sc, int detach, boolean_t del_iaback)
533 {
534 struct carp_if *cif;
535
536 carp_suspend(sc, detach);
537
538 carp_multicast_cleanup(sc);
539 #ifdef INET6
540 carp_multicast6_cleanup(sc);
541 #endif
542
543 if (!sc->sc_dead && detach) {
544 struct carp_vhaddr *vha;
545
546 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
547 carp_deactivate_vhaddr(sc, vha, del_iaback);
548 KKASSERT(sc->sc_naddrs == 0);
549 }
550
551 if (sc->sc_carpdev != NULL) {
552 cif = sc->sc_carpdev->if_carp;
553 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
554 if (TAILQ_EMPTY(&cif->vhif_vrs)) {
555 ifpromisc(sc->sc_carpdev, 0);
556 sc->sc_carpdev->if_carp = NULL;
557 kfree(cif, M_CARP);
558 }
559 sc->sc_carpdev = NULL;
560 sc->sc_ia = NULL;
561 }
562 }
563
564 static void
565 carp_ifdetach_dispatch(netmsg_t msg)
566 {
567 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
568 struct ifnet *ifp = cmsg->nc_carpdev;
569 struct carp_if *cif = ifp->if_carp;
570 struct carp_softc *sc;
571
572 carp_gettok();
573
574 while (ifp->if_carp &&
575 (sc = TAILQ_FIRST(&cif->vhif_vrs)) != NULL)
576 carp_detach(sc, 1, TRUE);
577
578 carp_reltok();
579
580 lwkt_replymsg(&cmsg->base.lmsg, 0);
581 }
582
583 /* Detach an interface from the carp. */
584 static void
585 carp_ifdetach(void *arg __unused, struct ifnet *ifp)
586 {
587 struct netmsg_carp cmsg;
588
589 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp);
590
591 bzero(&cmsg, sizeof(cmsg));
592 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
593 carp_ifdetach_dispatch);
594 cmsg.nc_carpdev = ifp;
595
596 lwkt_domsg(cpu_portfn(0), &cmsg.base.lmsg, 0);
597 }
598
599 /*
600 * process input packet.
601 * we have rearranged checks order compared to the rfc,
602 * but it seems more efficient this way or not possible otherwise.
603 */
604 int
605 carp_proto_input(struct mbuf **mp, int *offp, int proto)
606 {
607 struct mbuf *m = *mp;
608 struct ip *ip = mtod(m, struct ip *);
609 struct ifnet *ifp = m->m_pkthdr.rcvif;
610 struct carp_header *ch;
611 struct carp_softc *sc;
612 int len, iphlen;
613
614 carp_gettok();
615
616 iphlen = *offp;
617 *mp = NULL;
618
619 carpstats.carps_ipackets++;
620
621 if (!carp_opts[CARPCTL_ALLOW]) {
622 m_freem(m);
623 goto back;
624 }
625
626 /* Check if received on a valid carp interface */
627 if (ifp->if_type != IFT_CARP) {
628 carpstats.carps_badif++;
629 CARP_LOG("carp_proto_input: packet received on non-carp "
630 "interface: %s\n", ifp->if_xname);
631 m_freem(m);
632 goto back;
633 }
634
635 if (!CARP_IS_RUNNING(ifp)) {
636 carpstats.carps_badif++;
637 CARP_LOG("carp_proto_input: packet received on stopped carp "
638 "interface: %s\n", ifp->if_xname);
639 m_freem(m);
640 goto back;
641 }
642
643 sc = ifp->if_softc;
644 if (sc->sc_carpdev == NULL) {
645 carpstats.carps_badif++;
646 CARP_LOG("carp_proto_input: packet received on defunc carp "
647 "interface: %s\n", ifp->if_xname);
648 m_freem(m);
649 goto back;
650 }
651
652 if (!IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
653 carpstats.carps_badif++;
654 CARP_LOG("carp_proto_input: non-mcast packet on "
655 "interface: %s\n", ifp->if_xname);
656 m_freem(m);
657 goto back;
658 }
659
660 /* Verify that the IP TTL is CARP_DFLTTL. */
661 if (ip->ip_ttl != CARP_DFLTTL) {
662 carpstats.carps_badttl++;
663 CARP_LOG("carp_proto_input: received ttl %d != %d on %s\n",
664 ip->ip_ttl, CARP_DFLTTL, ifp->if_xname);
665 m_freem(m);
666 goto back;
667 }
668
669 /* Minimal CARP packet size */
670 len = iphlen + sizeof(*ch);
671
672 /*
673 * Verify that the received packet length is
674 * not less than the CARP header
675 */
676 if (m->m_pkthdr.len < len) {
677 carpstats.carps_badlen++;
678 CARP_LOG("packet too short %d on %s\n", m->m_pkthdr.len,
679 ifp->if_xname);
680 m_freem(m);
681 goto back;
682 }
683
684 /* Make sure that CARP header is contiguous */
685 if (len > m->m_len) {
686 m = m_pullup(m, len);
687 if (m == NULL) {
688 carpstats.carps_hdrops++;
689 CARP_LOG("carp_proto_input: m_pullup failed\n");
690 goto back;
691 }
692 ip = mtod(m, struct ip *);
693 }
694 ch = (struct carp_header *)((uint8_t *)ip + iphlen);
695
696 /* Verify the CARP checksum */
697 if (in_cksum_skip(m, len, iphlen)) {
698 carpstats.carps_badsum++;
699 CARP_LOG("carp_proto_input: checksum failed on %s\n",
700 ifp->if_xname);
701 m_freem(m);
702 goto back;
703 }
704 carp_proto_input_c(sc, m, ch, AF_INET);
705 back:
706 carp_reltok();
707 return(IPPROTO_DONE);
708 }
709
710 #ifdef INET6
711 int
712 carp6_proto_input(struct mbuf **mp, int *offp, int proto)
713 {
714 struct mbuf *m = *mp;
715 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
716 struct ifnet *ifp = m->m_pkthdr.rcvif;
717 struct carp_header *ch;
718 struct carp_softc *sc;
719 u_int len;
720
721 carp_gettok();
722
723 carpstats.carps_ipackets6++;
724
725 if (!carp_opts[CARPCTL_ALLOW]) {
726 m_freem(m);
727 goto back;
728 }
729
730 /* check if received on a valid carp interface */
731 if (ifp->if_type != IFT_CARP) {
732 carpstats.carps_badif++;
733 CARP_LOG("carp6_proto_input: packet received on non-carp "
734 "interface: %s\n", ifp->if_xname);
735 m_freem(m);
736 goto back;
737 }
738
739 if (!CARP_IS_RUNNING(ifp)) {
740 carpstats.carps_badif++;
741 CARP_LOG("carp_proto_input: packet received on stopped carp "
742 "interface: %s\n", ifp->if_xname);
743 m_freem(m);
744 goto back;
745 }
746
747 sc = ifp->if_softc;
748 if (sc->sc_carpdev == NULL) {
749 carpstats.carps_badif++;
750 CARP_LOG("carp6_proto_input: packet received on defunc-carp "
751 "interface: %s\n", ifp->if_xname);
752 m_freem(m);
753 goto back;
754 }
755
756 /* verify that the IP TTL is 255 */
757 if (ip6->ip6_hlim != CARP_DFLTTL) {
758 carpstats.carps_badttl++;
759 CARP_LOG("carp6_proto_input: received ttl %d != 255 on %s\n",
760 ip6->ip6_hlim, ifp->if_xname);
761 m_freem(m);
762 goto back;
763 }
764
765 /* verify that we have a complete carp packet */
766 len = m->m_len;
767 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
768 if (ch == NULL) {
769 carpstats.carps_badlen++;
770 CARP_LOG("carp6_proto_input: packet size %u too small\n", len);
771 goto back;
772 }
773
774 /* verify the CARP checksum */
775 if (in_cksum_range(m, 0, *offp, sizeof(*ch))) {
776 carpstats.carps_badsum++;
777 CARP_LOG("carp6_proto_input: checksum failed, on %s\n",
778 ifp->if_xname);
779 m_freem(m);
780 goto back;
781 }
782
783 carp_proto_input_c(sc, m, ch, AF_INET6);
784 back:
785 carp_reltok();
786 return (IPPROTO_DONE);
787 }
788 #endif /* INET6 */
789
790 static void
791 carp_proto_input_c(struct carp_softc *sc, struct mbuf *m,
792 struct carp_header *ch, sa_family_t af)
793 {
794 struct ifnet *cifp;
795 uint64_t tmp_counter;
796 struct timeval sc_tv, ch_tv;
797
798 if (sc->sc_vhid != ch->carp_vhid) {
799 /*
800 * CARP uses multicast, however, multicast packets
801 * are tapped to all CARP interfaces on the physical
802 * interface receiving the CARP packets, so we don't
803 * update any stats here.
804 */
805 m_freem(m);
806 return;
807 }
808 cifp = &sc->sc_if;
809
810 /* verify the CARP version. */
811 if (ch->carp_version != CARP_VERSION) {
812 carpstats.carps_badver++;
813 CARP_LOG("%s; invalid version %d\n", cifp->if_xname,
814 ch->carp_version);
815 m_freem(m);
816 return;
817 }
818
819 /* verify the hash */
820 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
821 carpstats.carps_badauth++;
822 CARP_LOG("%s: incorrect hash\n", cifp->if_xname);
823 m_freem(m);
824 return;
825 }
826
827 tmp_counter = ntohl(ch->carp_counter[0]);
828 tmp_counter = tmp_counter<<32;
829 tmp_counter += ntohl(ch->carp_counter[1]);
830
831 /* XXX Replay protection goes here */
832
833 sc->sc_init_counter = 0;
834 sc->sc_counter = tmp_counter;
835
836 sc_tv.tv_sec = sc->sc_advbase;
837 if (carp_suppress_preempt && sc->sc_advskew < 240)
838 sc_tv.tv_usec = 240 * 1000000 / 256;
839 else
840 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256;
841 ch_tv.tv_sec = ch->carp_advbase;
842 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
843
844 switch (sc->sc_state) {
845 case INIT:
846 break;
847
848 case MASTER:
849 /*
850 * If we receive an advertisement from a master who's going to
851 * be more frequent than us, go into BACKUP state.
852 */
853 if (timevalcmp(&sc_tv, &ch_tv, >) ||
854 timevalcmp(&sc_tv, &ch_tv, ==)) {
855 callout_stop(&sc->sc_ad_tmo);
856 CARP_DEBUG("%s: MASTER -> BACKUP "
857 "(more frequent advertisement received)\n",
858 cifp->if_xname);
859 carp_set_state(sc, BACKUP);
860 carp_setrun(sc, 0);
861 carp_setroute(sc, RTM_DELETE);
862 }
863 break;
864
865 case BACKUP:
866 /*
867 * If we're pre-empting masters who advertise slower than us,
868 * and this one claims to be slower, treat him as down.
869 */
870 if (carp_opts[CARPCTL_PREEMPT] &&
871 timevalcmp(&sc_tv, &ch_tv, <)) {
872 CARP_DEBUG("%s: BACKUP -> MASTER "
873 "(preempting a slower master)\n", cifp->if_xname);
874 carp_master_down(sc);
875 break;
876 }
877
878 /*
879 * If the master is going to advertise at such a low frequency
880 * that he's guaranteed to time out, we'd might as well just
881 * treat him as timed out now.
882 */
883 sc_tv.tv_sec = sc->sc_advbase * 3;
884 if (timevalcmp(&sc_tv, &ch_tv, <)) {
885 CARP_DEBUG("%s: BACKUP -> MASTER (master timed out)\n",
886 cifp->if_xname);
887 carp_master_down(sc);
888 break;
889 }
890
891 /*
892 * Otherwise, we reset the counter and wait for the next
893 * advertisement.
894 */
895 carp_setrun(sc, af);
896 break;
897 }
898 m_freem(m);
899 }
900
901 struct mbuf *
902 carp_input(void *v, struct mbuf *m)
903 {
904 struct carp_if *cif = v;
905 struct ether_header *eh;
906 struct carp_softc *sc;
907 struct ifnet *ifp;
908
909 ASSERT_LWKT_TOKEN_HELD(&carp_tok);
910
911 eh = mtod(m, struct ether_header *);
912
913 ifp = carp_forus(cif, eh->ether_dhost);
914 if (ifp != NULL) {
915 ether_reinput_oncpu(ifp, m, REINPUT_RUNBPF);
916 return NULL;
917 }
918
919 if ((m->m_flags & (M_BCAST | M_MCAST)) == 0)
920 return m;
921
922 /*
923 * XXX Should really check the list of multicast addresses
924 * for each CARP interface _before_ copying.
925 */
926 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
927 struct mbuf *m0;
928
929 if ((sc->sc_if.if_flags & IFF_UP) == 0)
930 continue;
931
932 m0 = m_dup(m, MB_DONTWAIT);
933 if (m0 == NULL)
934 continue;
935
936 ether_reinput_oncpu(&sc->sc_if, m0, REINPUT_RUNBPF);
937 }
938 return m;
939 }
940
941 static void
942 carp_prepare_ad(struct carp_softc *sc, struct carp_header *ch)
943 {
944 if (sc->sc_init_counter) {
945 /* this could also be seconds since unix epoch */
946 sc->sc_counter = karc4random();
947 sc->sc_counter = sc->sc_counter << 32;
948 sc->sc_counter += karc4random();
949 } else {
950 sc->sc_counter++;
951 }
952
953 ch->carp_counter[0] = htonl((sc->sc_counter >> 32) & 0xffffffff);
954 ch->carp_counter[1] = htonl(sc->sc_counter & 0xffffffff);
955
956 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
957 }
958
959 static void
960 carp_send_ad_all(void)
961 {
962 struct carp_softc *sc;
963
964 LIST_FOREACH(sc, &carpif_list, sc_next) {
965 if (sc->sc_carpdev == NULL)
966 continue;
967
968 if (CARP_IS_RUNNING(&sc->sc_if) && sc->sc_state == MASTER)
969 carp_send_ad(sc);
970 }
971 }
972
973 static void
974 carp_send_ad_timeout(void *xsc)
975 {
976 carp_gettok();
977 carp_send_ad(xsc);
978 carp_reltok();
979 }
980
981 static void
982 carp_send_ad(struct carp_softc *sc)
983 {
984 struct ifnet *cifp = &sc->sc_if;
985 struct carp_header ch;
986 struct timeval tv;
987 struct carp_header *ch_ptr;
988 struct mbuf *m;
989 int len, advbase, advskew;
990
991 if (!CARP_IS_RUNNING(cifp)) {
992 /* Bow out */
993 advbase = 255;
994 advskew = 255;
995 } else {
996 advbase = sc->sc_advbase;
997 if (!carp_suppress_preempt || sc->sc_advskew > 240)
998 advskew = sc->sc_advskew;
999 else
1000 advskew = 240;
1001 tv.tv_sec = advbase;
1002 tv.tv_usec = advskew * 1000000 / 256;
1003 }
1004
1005 ch.carp_version = CARP_VERSION;
1006 ch.carp_type = CARP_ADVERTISEMENT;
1007 ch.carp_vhid = sc->sc_vhid;
1008 ch.carp_advbase = advbase;
1009 ch.carp_advskew = advskew;
1010 ch.carp_authlen = 7; /* XXX DEFINE */
1011 ch.carp_pad1 = 0; /* must be zero */
1012 ch.carp_cksum = 0;
1013
1014 #ifdef INET
1015 if (sc->sc_ia != NULL) {
1016 struct ip *ip;
1017
1018 MGETHDR(m, MB_DONTWAIT, MT_HEADER);
1019 if (m == NULL) {
1020 cifp->if_oerrors++;
1021 carpstats.carps_onomem++;
1022 /* XXX maybe less ? */
1023 if (advbase != 255 || advskew != 255)
1024 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1025 carp_send_ad_timeout, sc);
1026 return;
1027 }
1028 len = sizeof(*ip) + sizeof(ch);
1029 m->m_pkthdr.len = len;
1030 m->m_pkthdr.rcvif = NULL;
1031 m->m_len = len;
1032 MH_ALIGN(m, m->m_len);
1033 m->m_flags |= M_MCAST;
1034 ip = mtod(m, struct ip *);
1035 ip->ip_v = IPVERSION;
1036 ip->ip_hl = sizeof(*ip) >> 2;
1037 ip->ip_tos = IPTOS_LOWDELAY;
1038 ip->ip_len = len;
1039 ip->ip_id = ip_newid();
1040 ip->ip_off = IP_DF;
1041 ip->ip_ttl = CARP_DFLTTL;
1042 ip->ip_p = IPPROTO_CARP;
1043 ip->ip_sum = 0;
1044 ip->ip_src = sc->sc_ia->ia_addr.sin_addr;
1045 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
1046
1047 ch_ptr = (struct carp_header *)(&ip[1]);
1048 bcopy(&ch, ch_ptr, sizeof(ch));
1049 carp_prepare_ad(sc, ch_ptr);
1050 ch_ptr->carp_cksum = in_cksum_skip(m, len, sizeof(*ip));
1051
1052 getmicrotime(&cifp->if_lastchange);
1053 cifp->if_opackets++;
1054 cifp->if_obytes += len;
1055 carpstats.carps_opackets++;
1056
1057 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) {
1058 cifp->if_oerrors++;
1059 if (sc->sc_sendad_errors < INT_MAX)
1060 sc->sc_sendad_errors++;
1061 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1062 carp_suppress_preempt++;
1063 if (carp_suppress_preempt == 1) {
1064 carp_send_ad_all();
1065 }
1066 }
1067 sc->sc_sendad_success = 0;
1068 } else {
1069 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1070 if (++sc->sc_sendad_success >=
1071 CARP_SENDAD_MIN_SUCCESS) {
1072 carp_suppress_preempt--;
1073 sc->sc_sendad_errors = 0;
1074 }
1075 } else {
1076 sc->sc_sendad_errors = 0;
1077 }
1078 }
1079 }
1080 #endif /* INET */
1081 #ifdef INET6
1082 if (sc->sc_ia6) {
1083 struct ip6_hdr *ip6;
1084
1085 MGETHDR(m, MB_DONTWAIT, MT_HEADER);
1086 if (m == NULL) {
1087 cifp->if_oerrors++;
1088 carpstats.carps_onomem++;
1089 /* XXX maybe less ? */
1090 if (advbase != 255 || advskew != 255)
1091 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1092 carp_send_ad_timeout, sc);
1093 return;
1094 }
1095 len = sizeof(*ip6) + sizeof(ch);
1096 m->m_pkthdr.len = len;
1097 m->m_pkthdr.rcvif = NULL;
1098 m->m_len = len;
1099 MH_ALIGN(m, m->m_len);
1100 m->m_flags |= M_MCAST;
1101 ip6 = mtod(m, struct ip6_hdr *);
1102 bzero(ip6, sizeof(*ip6));
1103 ip6->ip6_vfc |= IPV6_VERSION;
1104 ip6->ip6_hlim = CARP_DFLTTL;
1105 ip6->ip6_nxt = IPPROTO_CARP;
1106 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src,
1107 sizeof(struct in6_addr));
1108 /* set the multicast destination */
1109
1110 ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
1111 ip6->ip6_dst.s6_addr8[15] = 0x12;
1112 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
1113 cifp->if_oerrors++;
1114 m_freem(m);
1115 CARP_LOG("%s: in6_setscope failed\n", __func__);
1116 return;
1117 }
1118
1119 ch_ptr = (struct carp_header *)(&ip6[1]);
1120 bcopy(&ch, ch_ptr, sizeof(ch));
1121 carp_prepare_ad(sc, ch_ptr);
1122 ch_ptr->carp_cksum = in_cksum_skip(m, len, sizeof(*ip6));
1123
1124 getmicrotime(&cifp->if_lastchange);
1125 cifp->if_opackets++;
1126 cifp->if_obytes += len;
1127 carpstats.carps_opackets6++;
1128
1129 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) {
1130 cifp->if_oerrors++;
1131 if (sc->sc_sendad_errors < INT_MAX)
1132 sc->sc_sendad_errors++;
1133 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1134 carp_suppress_preempt++;
1135 if (carp_suppress_preempt == 1) {
1136 carp_send_ad_all();
1137 }
1138 }
1139 sc->sc_sendad_success = 0;
1140 } else {
1141 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1142 if (++sc->sc_sendad_success >=
1143 CARP_SENDAD_MIN_SUCCESS) {
1144 carp_suppress_preempt--;
1145 sc->sc_sendad_errors = 0;
1146 }
1147 } else {
1148 sc->sc_sendad_errors = 0;
1149 }
1150 }
1151 }
1152 #endif /* INET6 */
1153
1154 if (advbase != 255 || advskew != 255)
1155 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1156 carp_send_ad_timeout, sc);
1157 }
1158
1159 /*
1160 * Broadcast a gratuitous ARP request containing
1161 * the virtual router MAC address for each IP address
1162 * associated with the virtual router.
1163 */
1164 static void
1165 carp_send_arp(struct carp_softc *sc)
1166 {
1167 const struct carp_vhaddr *vha;
1168
1169 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1170 if (vha->vha_iaback == NULL)
1171 continue;
1172 arp_gratuitous(&sc->sc_if, &vha->vha_ia->ia_ifa);
1173 }
1174 }
1175
1176 #ifdef INET6
1177 static void
1178 carp_send_na(struct carp_softc *sc)
1179 {
1180 struct ifaddr_container *ifac;
1181 struct in6_addr *in6;
1182 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1183
1184 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
1185 struct ifaddr *ifa = ifac->ifa;
1186
1187 if (ifa->ifa_addr->sa_family != AF_INET6)
1188 continue;
1189
1190 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
1191 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1192 ND_NA_FLAG_OVERRIDE, 1, NULL);
1193 DELAY(1000); /* XXX */
1194 }
1195 }
1196 #endif /* INET6 */
1197
1198 static __inline const struct carp_vhaddr *
1199 carp_find_addr(const struct carp_softc *sc, const struct in_addr *addr)
1200 {
1201 struct carp_vhaddr *vha;
1202
1203 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1204 if (vha->vha_iaback == NULL)
1205 continue;
1206
1207 if (vha->vha_ia->ia_addr.sin_addr.s_addr == addr->s_addr)
1208 return vha;
1209 }
1210 return NULL;
1211 }
1212
1213 #ifdef notyet
1214 static int
1215 carp_iamatch_balance(const struct carp_if *cif, const struct in_addr *itaddr,
1216 const struct in_addr *isaddr, uint8_t **enaddr)
1217 {
1218 const struct carp_softc *vh;
1219 int index, count = 0;
1220
1221 /*
1222 * XXX proof of concept implementation.
1223 * We use the source ip to decide which virtual host should
1224 * handle the request. If we're master of that virtual host,
1225 * then we respond, otherwise, just drop the arp packet on
1226 * the floor.
1227 */
1228
1229 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1230 if (!CARP_IS_RUNNING(&vh->sc_if))
1231 continue;
1232
1233 if (carp_find_addr(vh, itaddr) != NULL)
1234 count++;
1235 }
1236 if (count == 0)
1237 return 0;
1238
1239 /* this should be a hash, like pf_hash() */
1240 index = ntohl(isaddr->s_addr) % count;
1241 count = 0;
1242
1243 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1244 if (!CARP_IS_RUNNING(&vh->sc_if))
1245 continue;
1246
1247 if (carp_find_addr(vh, itaddr) == NULL)
1248 continue;
1249
1250 if (count == index) {
1251 if (vh->sc_state == MASTER) {
1252 *enaddr = IF_LLADDR(&vh->sc_if);
1253 return 1;
1254 } else {
1255 return 0;
1256 }
1257 }
1258 count++;
1259 }
1260 return 0;
1261 }
1262 #endif
1263
1264 int
1265 carp_iamatch(const struct in_ifaddr *ia)
1266 {
1267 const struct carp_softc *sc = ia->ia_ifp->if_softc;
1268
1269 ASSERT_LWKT_TOKEN_HELD(&carp_tok);
1270
1271 #ifdef notyet
1272 if (carp_opts[CARPCTL_ARPBALANCE])
1273 return carp_iamatch_balance(cif, itaddr, isaddr, enaddr);
1274 #endif
1275
1276 if (!CARP_IS_RUNNING(&sc->sc_if) || sc->sc_state != MASTER)
1277 return 0;
1278
1279 return 1;
1280 }
1281
1282 #ifdef INET6
1283 struct ifaddr *
1284 carp_iamatch6(void *v, struct in6_addr *taddr)
1285 {
1286 struct carp_if *cif = v;
1287 struct carp_softc *vh;
1288
1289 ASSERT_LWKT_TOKEN_HELD(&carp_tok);
1290
1291 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1292 struct ifaddr_container *ifac;
1293
1294 TAILQ_FOREACH(ifac, &vh->sc_if.if_addrheads[mycpuid],
1295 ifa_link) {
1296 struct ifaddr *ifa = ifac->ifa;
1297
1298 if (IN6_ARE_ADDR_EQUAL(taddr,
1299 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1300 CARP_IS_RUNNING(&vh->sc_if) &&
1301 vh->sc_state == MASTER) {
1302 return (ifa);
1303 }
1304 }
1305 }
1306 return (NULL);
1307 }
1308
1309 void *
1310 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr)
1311 {
1312 struct m_tag *mtag;
1313 struct carp_if *cif = v;
1314 struct carp_softc *sc;
1315
1316 ASSERT_LWKT_TOKEN_HELD(&carp_tok);
1317
1318 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
1319 struct ifaddr_container *ifac;
1320
1321 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid],
1322 ifa_link) {
1323 struct ifaddr *ifa = ifac->ifa;
1324
1325 if (IN6_ARE_ADDR_EQUAL(taddr,
1326 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1327 CARP_IS_RUNNING(&sc->sc_if)) {
1328 struct ifnet *ifp = &sc->sc_if;
1329
1330 mtag = m_tag_get(PACKET_TAG_CARP,
1331 sizeof(struct ifnet *), MB_DONTWAIT);
1332 if (mtag == NULL) {
1333 /* better a bit than nothing */
1334 return (IF_LLADDR(ifp));
1335 }
1336 bcopy(&ifp, (caddr_t)(mtag + 1),
1337 sizeof(struct ifnet *));
1338 m_tag_prepend(m, mtag);
1339
1340 return (IF_LLADDR(ifp));
1341 }
1342 }
1343 }
1344 return (NULL);
1345 }
1346 #endif
1347
1348 static struct ifnet *
1349 carp_forus(struct carp_if *cif, const uint8_t *dhost)
1350 {
1351 struct carp_softc *sc;
1352
1353 ASSERT_LWKT_TOKEN_HELD(&carp_tok);
1354
1355 if (memcmp(dhost, carp_etheraddr, ETHER_ADDR_LEN - 1) != 0)
1356 return NULL;
1357
1358 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
1359 struct ifnet *ifp = &sc->sc_if;
1360
1361 if (CARP_IS_RUNNING(ifp) && sc->sc_state == MASTER &&
1362 !bcmp(dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN))
1363 return ifp;
1364 }
1365 return NULL;
1366 }
1367
1368 static void
1369 carp_master_down_timeout(void *xsc)
1370 {
1371 struct carp_softc *sc = xsc;
1372
1373 CARP_DEBUG("%s: BACKUP -> MASTER (master timed out)\n",
1374 sc->sc_if.if_xname);
1375 carp_gettok();
1376 carp_master_down(sc);
1377 carp_reltok();
1378 }
1379
1380 static void
1381 carp_master_down(struct carp_softc *sc)
1382 {
1383 switch (sc->sc_state) {
1384 case INIT:
1385 kprintf("%s: master_down event in INIT state\n",
1386 sc->sc_if.if_xname);
1387 break;
1388
1389 case MASTER:
1390 break;
1391
1392 case BACKUP:
1393 carp_set_state(sc, MASTER);
1394 carp_send_ad(sc);
1395 carp_send_arp(sc);
1396 #ifdef INET6
1397 carp_send_na(sc);
1398 #endif /* INET6 */
1399 carp_setrun(sc, 0);
1400 carp_setroute(sc, RTM_ADD);
1401 break;
1402 }
1403 }
1404
1405 /*
1406 * When in backup state, af indicates whether to reset the master down timer
1407 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1408 */
1409 static void
1410 carp_setrun(struct carp_softc *sc, sa_family_t af)
1411 {
1412 struct ifnet *cifp = &sc->sc_if;
1413 struct timeval tv;
1414
1415 if (sc->sc_carpdev == NULL) {
1416 carp_set_state(sc, INIT);
1417 return;
1418 }
1419
1420 if ((cifp->if_flags & IFF_RUNNING) && sc->sc_vhid > 0 &&
1421 (sc->sc_naddrs || sc->sc_naddrs6)) {
1422 /* Nothing */
1423 } else {
1424 carp_setroute(sc, RTM_DELETE);
1425 return;
1426 }
1427
1428 switch (sc->sc_state) {
1429 case INIT:
1430 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) {
1431 carp_send_ad(sc);
1432 carp_send_arp(sc);
1433 #ifdef INET6
1434 carp_send_na(sc);
1435 #endif /* INET6 */
1436 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n",
1437 cifp->if_xname);
1438 carp_set_state(sc, MASTER);
1439 carp_setroute(sc, RTM_ADD);
1440 } else {
1441 CARP_DEBUG("%s: INIT -> BACKUP\n", cifp->if_xname);
1442 carp_set_state(sc, BACKUP);
1443 carp_setroute(sc, RTM_DELETE);
1444 carp_setrun(sc, 0);
1445 }
1446 break;
1447
1448 case BACKUP:
1449 callout_stop(&sc->sc_ad_tmo);
1450 tv.tv_sec = 3 * sc->sc_advbase;
1451 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1452 switch (af) {
1453 #ifdef INET
1454 case AF_INET:
1455 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
1456 carp_master_down_timeout, sc);
1457 break;
1458 #endif /* INET */
1459 #ifdef INET6
1460 case AF_INET6:
1461 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
1462 carp_master_down_timeout, sc);
1463 break;
1464 #endif /* INET6 */
1465 default:
1466 if (sc->sc_naddrs)
1467 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
1468 carp_master_down_timeout, sc);
1469 if (sc->sc_naddrs6)
1470 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
1471 carp_master_down_timeout, sc);
1472 break;
1473 }
1474 break;
1475
1476 case MASTER:
1477 tv.tv_sec = sc->sc_advbase;
1478 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1479 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1480 carp_send_ad_timeout, sc);
1481 break;
1482 }
1483 }
1484
1485 static void
1486 carp_multicast_cleanup(struct carp_softc *sc)
1487 {
1488 struct ip_moptions *imo = &sc->sc_imo;
1489
1490 if (imo->imo_num_memberships == 0)
1491 return;
1492 KKASSERT(imo->imo_num_memberships == 1);
1493
1494 in_delmulti(imo->imo_membership[0]);
1495 imo->imo_membership[0] = NULL;
1496 imo->imo_num_memberships = 0;
1497 imo->imo_multicast_ifp = NULL;
1498 }
1499
1500 #ifdef INET6
1501 static void
1502 carp_multicast6_cleanup(struct carp_softc *sc)
1503 {
1504 struct ip6_moptions *im6o = &sc->sc_im6o;
1505
1506 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1507 struct in6_multi_mship *imm =
1508 LIST_FIRST(&im6o->im6o_memberships);
1509
1510 LIST_REMOVE(imm, i6mm_chain);
1511 in6_leavegroup(imm);
1512 }
1513 im6o->im6o_multicast_ifp = NULL;
1514 }
1515 #endif
1516
1517 static void
1518 carp_ioctl_getvhaddr_dispatch(netmsg_t msg)
1519 {
1520 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
1521 struct carp_softc *sc = cmsg->nc_softc;
1522 const struct carp_vhaddr *vha;
1523 struct ifcarpvhaddr *carpa, *carpa0;
1524 int count, len, error = 0;
1525
1526 carp_gettok();
1527
1528 count = 0;
1529 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
1530 ++count;
1531
1532 if (cmsg->nc_datalen == 0) {
1533 cmsg->nc_datalen = count * sizeof(*carpa);
1534 goto back;
1535 } else if (count == 0 || cmsg->nc_datalen < sizeof(*carpa)) {
1536 cmsg->nc_datalen = 0;
1537 goto back;
1538 }
1539 len = min(cmsg->nc_datalen, sizeof(*carpa) * count);
1540 KKASSERT(len >= sizeof(*carpa));
1541
1542 carpa0 = carpa = kmalloc(len, M_TEMP, M_WAITOK | M_NULLOK | M_ZERO);
1543 if (carpa == NULL) {
1544 error = ENOMEM;
1545 goto back;
1546 }
1547
1548 count = 0;
1549 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1550 if (len < sizeof(*carpa))
1551 break;
1552
1553 carpa->carpa_flags = vha->vha_flags;
1554 carpa->carpa_addr.sin_family = AF_INET;
1555 carpa->carpa_addr.sin_addr = vha->vha_ia->ia_addr.sin_addr;
1556
1557 carpa->carpa_baddr.sin_family = AF_INET;
1558 if (vha->vha_iaback == NULL) {
1559 carpa->carpa_baddr.sin_addr.s_addr = INADDR_ANY;
1560 } else {
1561 carpa->carpa_baddr.sin_addr =
1562 vha->vha_iaback->ia_addr.sin_addr;
1563 }
1564
1565 ++carpa;
1566 ++count;
1567 len -= sizeof(*carpa);
1568 }
1569 cmsg->nc_datalen = sizeof(*carpa) * count;
1570 KKASSERT(cmsg->nc_datalen > 0);
1571
1572 cmsg->nc_data = carpa0;
1573
1574 back:
1575 carp_reltok();
1576 lwkt_replymsg(&cmsg->base.lmsg, error);
1577 }
1578
1579 static int
1580 carp_ioctl_getvhaddr(struct carp_softc *sc, struct ifdrv *ifd)
1581 {
1582 struct ifnet *ifp = &sc->arpcom.ac_if;
1583 struct netmsg_carp cmsg;
1584 int error;
1585
1586 ASSERT_IFNET_SERIALIZED_ALL(ifp);
1587 ifnet_deserialize_all(ifp);
1588
1589 bzero(&cmsg, sizeof(cmsg));
1590 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
1591 carp_ioctl_getvhaddr_dispatch);
1592 cmsg.nc_softc = sc;
1593 cmsg.nc_datalen = ifd->ifd_len;
1594
1595 error = lwkt_domsg(cpu_portfn(0), &cmsg.base.lmsg, 0);
1596
1597 if (!error) {
1598 if (cmsg.nc_data != NULL) {
1599 error = copyout(cmsg.nc_data, ifd->ifd_data,
1600 cmsg.nc_datalen);
1601 kfree(cmsg.nc_data, M_TEMP);
1602 }
1603 ifd->ifd_len = cmsg.nc_datalen;
1604 } else {
1605 KASSERT(cmsg.nc_data == NULL,
1606 ("%s temp vhaddr is alloc upon error\n", __func__));
1607 }
1608
1609 ifnet_serialize_all(ifp);
1610 return error;
1611 }
1612
1613 static int
1614 carp_config_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
1615 struct in_ifaddr *ia_del)
1616 {
1617 struct ifnet *ifp;
1618 struct in_ifaddr *ia_if;
1619 struct in_ifaddr_container *iac;
1620 const struct sockaddr_in *sin;
1621 u_long iaddr;
1622 int own;
1623
1624 KKASSERT(vha->vha_ia != NULL);
1625
1626 sin = &vha->vha_ia->ia_addr;
1627 iaddr = ntohl(sin->sin_addr.s_addr);
1628
1629 ia_if = NULL;
1630 own = 0;
1631 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1632 struct in_ifaddr *ia = iac->ia;
1633
1634 if (ia == ia_del)
1635 continue;
1636
1637 if (ia->ia_ifp->if_type == IFT_CARP)
1638 continue;
1639
1640 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
1641 continue;
1642
1643 /* and, yeah, we need a multicast-capable iface too */
1644 if ((ia->ia_ifp->if_flags & IFF_MULTICAST) == 0)
1645 continue;
1646
1647 if ((iaddr & ia->ia_subnetmask) == ia->ia_subnet) {
1648 if (sin->sin_addr.s_addr ==
1649 ia->ia_addr.sin_addr.s_addr)
1650 own = 1;
1651 if (ia_if == NULL)
1652 ia_if = ia;
1653 else if (sc->sc_carpdev != NULL &&
1654 sc->sc_carpdev == ia->ia_ifp)
1655 ia_if = ia;
1656 }
1657 }
1658
1659 carp_deactivate_vhaddr(sc, vha, FALSE);
1660 if (!ia_if)
1661 return ENOENT;
1662
1663 ifp = ia_if->ia_ifp;
1664
1665 /* XXX Don't allow parent iface to be changed */
1666 if (sc->sc_carpdev != NULL && sc->sc_carpdev != ifp)
1667 return EEXIST;
1668
1669 return carp_activate_vhaddr(sc, vha, ifp, ia_if, own);
1670 }
1671
1672 static void
1673 carp_add_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
1674 {
1675 struct carp_vhaddr *vha_new;
1676 struct in_ifaddr *carp_ia;
1677 #ifdef INVARIANTS
1678 struct carp_vhaddr *vha;
1679 #endif
1680
1681 KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
1682 carp_ia = ifatoia(carp_ifa);
1683
1684 #ifdef INVARIANTS
1685 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
1686 KKASSERT(vha->vha_ia != NULL && vha->vha_ia != carp_ia);
1687 #endif
1688
1689 vha_new = kmalloc(sizeof(*vha_new), M_CARP, M_WAITOK | M_ZERO);
1690 vha_new->vha_ia = carp_ia;
1691 carp_insert_vhaddr(sc, vha_new);
1692
1693 if (carp_config_vhaddr(sc, vha_new, NULL) != 0) {
1694 /*
1695 * If the above configuration fails, it may only mean
1696 * that the new address is problematic. However, the
1697 * carp(4) interface may already have several working
1698 * addresses. Since the expected behaviour of
1699 * SIOC[AS]IFADDR is to put the NIC into working state,
1700 * we try starting the state machine manually here with
1701 * the hope that the carp(4)'s previously working
1702 * addresses still could be brought up.
1703 */
1704 carp_hmac_prepare(sc);
1705 carp_set_state(sc, INIT);
1706 carp_setrun(sc, 0);
1707 }
1708 }
1709
1710 static void
1711 carp_del_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
1712 {
1713 struct carp_vhaddr *vha;
1714 struct in_ifaddr *carp_ia;
1715
1716 KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
1717 carp_ia = ifatoia(carp_ifa);
1718
1719 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1720 KKASSERT(vha->vha_ia != NULL);
1721 if (vha->vha_ia == carp_ia)
1722 break;
1723 }
1724 KASSERT(vha != NULL, ("no corresponding vhaddr %p\n", carp_ifa));
1725
1726 /*
1727 * Remove the vhaddr from the list before deactivating
1728 * the vhaddr, so that the HMAC could be correctly
1729 * updated in carp_deactivate_vhaddr()
1730 */
1731 carp_remove_vhaddr(sc, vha);
1732
1733 carp_deactivate_vhaddr(sc, vha, FALSE);
1734 kfree(vha, M_CARP);
1735 }
1736
1737 static void
1738 carp_config_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
1739 {
1740 struct carp_vhaddr *vha;
1741 struct in_ifaddr *carp_ia;
1742
1743 KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
1744 carp_ia = ifatoia(carp_ifa);
1745
1746 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1747 KKASSERT(vha->vha_ia != NULL);
1748 if (vha->vha_ia == carp_ia)
1749 break;
1750 }
1751 KASSERT(vha != NULL, ("no corresponding vhaddr %p\n", carp_ifa));
1752
1753 /* Remove then reinsert, to keep the vhaddr list sorted */
1754 carp_remove_vhaddr(sc, vha);
1755 carp_insert_vhaddr(sc, vha);
1756
1757 if (carp_config_vhaddr(sc, vha, NULL) != 0) {
1758 /* See the comment in carp_add_addr() */
1759 carp_hmac_prepare(sc);
1760 carp_set_state(sc, INIT);
1761 carp_setrun(sc, 0);
1762 }
1763 }
1764
1765 #ifdef notyet
1766
1767 #ifdef INET6
1768 static int
1769 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1770 {
1771 struct ifnet *ifp;
1772 struct carp_if *cif;
1773 struct in6_ifaddr *ia, *ia_if;
1774 struct ip6_moptions *im6o = &sc->sc_im6o;
1775 struct in6_multi_mship *imm;
1776 struct in6_addr in6;
1777 int own, error;
1778
1779 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1780 carp_setrun(sc, 0);
1781 return (0);
1782 }
1783
1784 /* we have to do it by hands to check we won't match on us */
1785 ia_if = NULL; own = 0;
1786 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1787 int i;
1788
1789 for (i = 0; i < 4; i++) {
1790 if ((sin6->sin6_addr.s6_addr32[i] &
1791 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
1792 (ia->ia_addr.sin6_addr.s6_addr32[i] &
1793 ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
1794 break;
1795 }
1796 /* and, yeah, we need a multicast-capable iface too */
1797 if (ia->ia_ifp != &sc->sc_if &&
1798 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1799 (i == 4)) {
1800 if (!ia_if)
1801 ia_if = ia;
1802 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
1803 &ia->ia_addr.sin6_addr))
1804 own++;
1805 }
1806 }
1807
1808 if (!ia_if)
1809 return (EADDRNOTAVAIL);
1810 ia = ia_if;
1811 ifp = ia->ia_ifp;
1812
1813 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1814 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp))
1815 return (EADDRNOTAVAIL);
1816
1817 if (!sc->sc_naddrs6) {
1818 im6o->im6o_multicast_ifp = ifp;
1819
1820 /* join CARP multicast address */
1821 bzero(&in6, sizeof(in6));
1822 in6.s6_addr16[0] = htons(0xff02);
1823 in6.s6_addr8[15] = 0x12;
1824 if (in6_setscope(&in6, ifp, NULL) != 0)
1825 goto cleanup;
1826 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
1827 goto cleanup;
1828 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1829
1830 /* join solicited multicast address */
1831 bzero(&in6, sizeof(in6));
1832 in6.s6_addr16[0] = htons(0xff02);
1833 in6.s6_addr32[1] = 0;
1834 in6.s6_addr32[2] = htonl(1);
1835 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3];
1836 in6.s6_addr8[12] = 0xff;
1837 if (in6_setscope(&in6, ifp, NULL) != 0)
1838 goto cleanup;
1839 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
1840 goto cleanup;
1841 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1842 }
1843
1844 if (!ifp->if_carp) {
1845 cif = kmalloc(sizeof(*cif), M_CARP, M_WAITOK | M_ZERO);
1846
1847 if ((error = ifpromisc(ifp, 1))) {
1848 kfree(cif, M_CARP);
1849 goto cleanup;
1850 }
1851
1852 TAILQ_INIT(&cif->vhif_vrs);
1853 ifp->if_carp = cif;
1854 } else {
1855 struct carp_softc *vr;
1856
1857 cif = ifp->if_carp;
1858 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1859 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1860 error = EINVAL;
1861 goto cleanup;
1862 }
1863 }
1864 }
1865 sc->sc_ia6 = ia;
1866 sc->sc_carpdev = ifp;
1867
1868 { /* XXX prevent endless loop if already in queue */
1869 struct carp_softc *vr, *after = NULL;
1870 int myself = 0;
1871 cif = ifp->if_carp;
1872
1873 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1874 if (vr == sc)
1875 myself = 1;
1876 if (vr->sc_vhid < sc->sc_vhid)
1877 after = vr;
1878 }
1879
1880 if (!myself) {
1881 /* We're trying to keep things in order */
1882 if (after == NULL)
1883 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1884 else
1885 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1886 }
1887 }
1888
1889 sc->sc_naddrs6++;
1890 if (own)
1891 sc->sc_advskew = 0;
1892 carp_sc_state(sc);
1893 carp_setrun(sc, 0);
1894
1895 return (0);
1896
1897 cleanup:
1898 /* clean up multicast memberships */
1899 if (!sc->sc_naddrs6) {
1900 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1901 imm = LIST_FIRST(&im6o->im6o_memberships);
1902 LIST_REMOVE(imm, i6mm_chain);
1903 in6_leavegroup(imm);
1904 }
1905 }
1906 return (error);
1907 }
1908
1909 static int
1910 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1911 {
1912 int error = 0;
1913
1914 if (!--sc->sc_naddrs6) {
1915 struct carp_if *cif = sc->sc_carpdev->if_carp;
1916 struct ip6_moptions *im6o = &sc->sc_im6o;
1917
1918 callout_stop(&sc->sc_ad_tmo);
1919 sc->sc_vhid = -1;
1920 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1921 struct in6_multi_mship *imm =
1922 LIST_FIRST(&im6o->im6o_memberships);
1923
1924 LIST_REMOVE(imm, i6mm_chain);
1925 in6_leavegroup(imm);
1926 }
1927 im6o->im6o_multicast_ifp = NULL;
1928 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1929 if (TAILQ_EMPTY(&cif->vhif_vrs)) {
1930 sc->sc_carpdev->if_carp = NULL;
1931 kfree(cif, M_IFADDR);
1932 }
1933 }
1934 return (error);
1935 }
1936 #endif /* INET6 */
1937
1938 #endif
1939
1940 static int
1941 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr, struct ucred *cr)
1942 {
1943 struct carp_softc *sc = ifp->if_softc;
1944 struct ifreq *ifr = (struct ifreq *)addr;
1945 struct ifdrv *ifd = (struct ifdrv *)addr;
1946 int error = 0;
1947
1948 ASSERT_IFNET_SERIALIZED_ALL(ifp);
1949
1950 carp_gettok();
1951
1952 switch (cmd) {
1953 case SIOCSIFFLAGS:
1954 if (ifp->if_flags & IFF_UP) {
1955 if ((ifp->if_flags & IFF_RUNNING) == 0)
1956 carp_init(sc);
1957 } else if (ifp->if_flags & IFF_RUNNING) {
1958 carp_ioctl_stop(sc);
1959 }
1960 break;
1961
1962 case SIOCSVH:
1963 error = carp_ioctl_setvh(sc, ifr->ifr_data, cr);
1964 break;
1965
1966 case SIOCGVH:
1967 error = carp_ioctl_getvh(sc, ifr->ifr_data, cr);
1968 break;
1969
1970 case SIOCGDRVSPEC:
1971 switch (ifd->ifd_cmd) {
1972 case CARPGDEVNAME:
1973 error = carp_ioctl_getdevname(sc, ifd);
1974 break;
1975
1976 case CARPGVHADDR:
1977 error = carp_ioctl_getvhaddr(sc, ifd);
1978 break;
1979
1980 default:
1981 error = EINVAL;
1982 break;
1983 }
1984 break;
1985
1986 default:
1987 error = ether_ioctl(ifp, cmd, addr);
1988 break;
1989 }
1990
1991 carp_reltok();
1992 return error;
1993 }
1994
1995 static void
1996 carp_ioctl_stop_dispatch(netmsg_t msg)
1997 {
1998 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
1999 struct carp_softc *sc = cmsg->nc_softc;
2000
2001 carp_gettok();
2002 carp_stop(sc, 0);
2003 carp_reltok();
2004
2005 lwkt_replymsg(&cmsg->base.lmsg, 0);
2006 }
2007
2008 static void
2009 carp_ioctl_stop(struct carp_softc *sc)
2010 {
2011 struct ifnet *ifp = &sc->arpcom.ac_if;
2012 struct netmsg_carp cmsg;
2013
2014 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2015
2016 ifnet_deserialize_all(ifp);
2017
2018 bzero(&cmsg, sizeof(cmsg));
2019 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2020 carp_ioctl_stop_dispatch);
2021 cmsg.nc_softc = sc;
2022
2023 lwkt_domsg(cpu_portfn(0), &cmsg.base.lmsg, 0);
2024
2025 ifnet_serialize_all(ifp);
2026 }
2027
2028 static void
2029 carp_ioctl_setvh_dispatch(netmsg_t msg)
2030 {
2031 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2032 struct carp_softc *sc = cmsg->nc_softc, *vr;
2033 struct ifnet *ifp = &sc->arpcom.ac_if;
2034 const struct carpreq *carpr = cmsg->nc_data;
2035 int error;
2036
2037 carp_gettok();
2038
2039 error = 1;
2040 if ((ifp->if_flags & IFF_RUNNING) &&
2041 sc->sc_state != INIT && carpr->carpr_state != sc->sc_state) {
2042 switch (carpr->carpr_state) {
2043 case BACKUP:
2044 callout_stop(&sc->sc_ad_tmo);
2045 carp_set_state(sc, BACKUP);
2046 carp_setrun(sc, 0);
2047 carp_setroute(sc, RTM_DELETE);
2048 break;
2049
2050 case MASTER:
2051 carp_master_down(sc);
2052 break;
2053
2054 default:
2055 break;
2056 }
2057 }
2058 if (carpr->carpr_vhid > 0) {
2059 if (carpr->carpr_vhid > 255) {
2060 error = EINVAL;
2061 goto back;
2062 }
2063 if (sc->sc_carpdev) {
2064 struct carp_if *cif = sc->sc_carpdev->if_carp;
2065
2066 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
2067 if (vr != sc &&
2068 vr->sc_vhid == carpr->carpr_vhid) {
2069 error = EEXIST;
2070 goto back;
2071 }
2072 }
2073 }
2074 sc->sc_vhid = carpr->carpr_vhid;
2075
2076 IF_LLADDR(ifp)[5] = sc->sc_vhid;
2077 bcopy(IF_LLADDR(ifp), sc->arpcom.ac_enaddr,
2078 ETHER_ADDR_LEN);
2079
2080 error--;
2081 }
2082 if (carpr->carpr_advbase > 0 || carpr->carpr_advskew > 0) {
2083 if (carpr->carpr_advskew >= 255) {
2084 error = EINVAL;
2085 goto back;
2086 }
2087 if (carpr->carpr_advbase > 255) {
2088 error = EINVAL;
2089 goto back;
2090 }
2091 sc->sc_advbase = carpr->carpr_advbase;
2092 sc->sc_advskew = carpr->carpr_advskew;
2093 error--;
2094 }
2095 bcopy(carpr->carpr_key, sc->sc_key, sizeof(sc->sc_key));
2096 if (error > 0) {
2097 error = EINVAL;
2098 } else {
2099 error = 0;
2100 carp_setrun(sc, 0);
2101 }
2102 back:
2103 carp_hmac_prepare(sc);
2104 carp_gettok();
2105
2106 lwkt_replymsg(&cmsg->base.lmsg, error);
2107 }
2108
2109 static int
2110 carp_ioctl_setvh(struct carp_softc *sc, void *udata, struct ucred *cr)
2111 {
2112 struct ifnet *ifp = &sc->arpcom.ac_if;
2113 struct netmsg_carp cmsg;
2114 struct carpreq carpr;
2115 int error;
2116
2117 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2118 ifnet_deserialize_all(ifp);
2119
2120 error = priv_check_cred(cr, PRIV_ROOT, NULL_CRED_OKAY);
2121 if (error)
2122 goto back;
2123
2124 error = copyin(udata, &carpr, sizeof(carpr));
2125 if (error)
2126 goto back;
2127
2128 bzero(&cmsg, sizeof(cmsg));
2129 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2130 carp_ioctl_setvh_dispatch);
2131 cmsg.nc_softc = sc;
2132 cmsg.nc_data = &carpr;
2133
2134 error = lwkt_domsg(cpu_portfn(0), &cmsg.base.lmsg, 0);
2135
2136 back:
2137 ifnet_serialize_all(ifp);
2138 return error;
2139 }
2140
2141 static void
2142 carp_ioctl_getvh_dispatch(netmsg_t msg)
2143 {
2144 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2145 struct carp_softc *sc = cmsg->nc_softc;
2146 struct carpreq *carpr = cmsg->nc_data;
2147
2148 carp_gettok();
2149
2150 carpr->carpr_state = sc->sc_state;
2151 carpr->carpr_vhid = sc->sc_vhid;
2152 carpr->carpr_advbase = sc->sc_advbase;
2153 carpr->carpr_advskew = sc->sc_advskew;
2154 bcopy(sc->sc_key, carpr->carpr_key, sizeof(carpr->carpr_key));
2155
2156 carp_reltok();
2157
2158 lwkt_replymsg(&cmsg->base.lmsg, 0);
2159 }
2160
2161 static int
2162 carp_ioctl_getvh(struct carp_softc *sc, void *udata, struct ucred *cr)
2163 {
2164 struct ifnet *ifp = &sc->arpcom.ac_if;
2165 struct netmsg_carp cmsg;
2166 struct carpreq carpr;
2167 int error;
2168
2169 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2170 ifnet_deserialize_all(ifp);
2171
2172 bzero(&cmsg, sizeof(cmsg));
2173 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2174 carp_ioctl_getvh_dispatch);
2175 cmsg.nc_softc = sc;
2176 cmsg.nc_data = &carpr;
2177
2178 lwkt_domsg(cpu_portfn(0), &cmsg.base.lmsg, 0);
2179
2180 error = priv_check_cred(cr, PRIV_ROOT, NULL_CRED_OKAY);
2181 if (error)
2182 bzero(carpr.carpr_key, sizeof(carpr.carpr_key));
2183
2184 error = copyout(&carpr, udata, sizeof(carpr));
2185
2186 ifnet_serialize_all(ifp);
2187 return error;
2188 }
2189
2190 static void
2191 carp_ioctl_getdevname_dispatch(netmsg_t msg)
2192 {
2193 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2194 struct carp_softc *sc = cmsg->nc_softc;
2195 char *devname = cmsg->nc_data;
2196
2197 bzero(devname, sizeof(devname));
2198
2199 carp_gettok();
2200 if (sc->sc_carpdev != NULL)
2201 strlcpy(devname, sc->sc_carpdev->if_xname, sizeof(devname));
2202 carp_reltok();
2203
2204 lwkt_replymsg(&cmsg->base.lmsg, 0);
2205 }
2206
2207 static int
2208 carp_ioctl_getdevname(struct carp_softc *sc, struct ifdrv *ifd)
2209 {
2210 struct ifnet *ifp = &sc->arpcom.ac_if;
2211 struct netmsg_carp cmsg;
2212 char devname[IFNAMSIZ];
2213 int error;
2214
2215 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2216
2217 if (ifd->ifd_len != sizeof(devname))
2218 return EINVAL;
2219
2220 ifnet_deserialize_all(ifp);
2221
2222 bzero(&cmsg, sizeof(cmsg));
2223 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2224 carp_ioctl_getdevname_dispatch);
2225 cmsg.nc_softc = sc;
2226 cmsg.nc_data = devname;
2227
2228 lwkt_domsg(cpu_portfn(0), &cmsg.base.lmsg, 0);
2229
2230 error = copyout(devname, ifd->ifd_data, sizeof(devname));
2231
2232 ifnet_serialize_all(ifp);
2233 return error;
2234 }
2235
2236 static void
2237 carp_init_dispatch(netmsg_t msg)
2238 {
2239 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2240 struct carp_softc *sc = cmsg->nc_softc;
2241
2242 carp_gettok();
2243
2244 sc->sc_if.if_flags |= IFF_RUNNING;
2245 carp_hmac_prepare(sc);
2246 carp_set_state(sc, INIT);
2247 carp_setrun(sc, 0);
2248
2249 carp_reltok();
2250
2251 lwkt_replymsg(&cmsg->base.lmsg, 0);
2252 }
2253
2254 static void
2255 carp_init(void *xsc)
2256 {
2257 struct carp_softc *sc = xsc;
2258 struct ifnet *ifp = &sc->arpcom.ac_if;
2259 struct netmsg_carp cmsg;
2260
2261 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2262
2263 ifnet_deserialize_all(ifp);
2264
2265 bzero(&cmsg, sizeof(cmsg));
2266 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2267 carp_init_dispatch);
2268 cmsg.nc_softc = sc;
2269
2270 lwkt_domsg(cpu_portfn(0), &cmsg.base.lmsg, 0);
2271
2272 ifnet_serialize_all(ifp);
2273 }
2274
2275 static int
2276 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
2277 struct rtentry *rt)
2278 {
2279 struct carp_softc *sc = ifp->if_softc;
2280 int error = 0;
2281
2282 carp_gettok();
2283 if (sc->sc_carpdev) {
2284 /*
2285 * NOTE:
2286 * CARP's ifp is passed to backing device's
2287 * if_output method.
2288 */
2289 sc->sc_carpdev->if_output(ifp, m, dst, rt);
2290 } else {
2291 m_freem(m);
2292 error = ENETUNREACH;
2293 }
2294 carp_reltok();
2295
2296 return error;
2297 }
2298
2299 /*
2300 * Start output on carp interface. This function should never be called.
2301 */
2302 static void
2303 carp_start(struct ifnet *ifp)
2304 {
2305 panic("%s: start called\n", ifp->if_xname);
2306 }
2307
2308 static void
2309 carp_serialize(struct ifnet *ifp __unused,
2310 enum ifnet_serialize slz __unused)
2311 {
2312 }
2313
2314 static void
2315 carp_deserialize(struct ifnet *ifp __unused,
2316 enum ifnet_serialize slz __unused)
2317 {
2318 }
2319
2320 static int
2321 carp_tryserialize(struct ifnet *ifp __unused,
2322 enum ifnet_serialize slz __unused)
2323 {
2324 return 1;
2325 }
2326
2327 #ifdef INVARIANTS
2328
2329 static void
2330 carp_serialize_assert(struct ifnet *ifp __unused,
2331 enum ifnet_serialize slz __unused, boolean_t serialized __unused)
2332 {
2333 }
2334
2335 #endif /* INVARIANTS */
2336
2337 static void
2338 carp_set_state(struct carp_softc *sc, int state)
2339 {
2340 struct ifnet *cifp = &sc->sc_if;
2341
2342 if (sc->sc_state == state)
2343 return;
2344 sc->sc_state = state;
2345
2346 switch (sc->sc_state) {
2347 case BACKUP:
2348 cifp->if_link_state = LINK_STATE_DOWN;
2349 break;
2350
2351 case MASTER:
2352 cifp->if_link_state = LINK_STATE_UP;
2353 break;
2354
2355 default:
2356 cifp->if_link_state = LINK_STATE_UNKNOWN;
2357 break;
2358 }
2359 rt_ifmsg(cifp);
2360 }
2361
2362 void
2363 carp_group_demote_adj(struct ifnet *ifp, int adj)
2364 {
2365 struct ifg_list *ifgl;
2366 int *dm;
2367
2368 carp_gettok();
2369
2370 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) {
2371 if (!strcmp(ifgl->ifgl_group->ifg_group, IFG_ALL))
2372 continue;
2373 dm = &ifgl->ifgl_group->ifg_carp_demoted;
2374
2375 if (*dm + adj >= 0)
2376 *dm += adj;
2377 else
2378 *dm = 0;
2379
2380 if (adj > 0 && *dm == 1)
2381 carp_send_ad_all();
2382 CARP_LOG("%s demoted group %s to %d", ifp->if_xname,
2383 ifgl->ifgl_group->ifg_group, *dm);
2384 }
2385
2386 carp_reltok();
2387 }
2388
2389 void
2390 carp_carpdev_state(void *v)
2391 {
2392 struct carp_if *cif = v;
2393 struct carp_softc *sc;
2394
2395 carp_gettok();
2396
2397 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
2398 carp_sc_state(sc);
2399
2400 carp_reltok();
2401 }
2402
2403 static void
2404 carp_sc_state(struct carp_softc *sc)
2405 {
2406 if (!(sc->sc_carpdev->if_flags & IFF_UP)) {
2407 callout_stop(&sc->sc_ad_tmo);
2408 callout_stop(&sc->sc_md_tmo);
2409 callout_stop(&sc->sc_md6_tmo);
2410 carp_set_state(sc, INIT);
2411 carp_setrun(sc, 0);
2412 if (!sc->sc_suppress) {
2413 carp_suppress_preempt++;
2414 if (carp_suppress_preempt == 1)
2415 carp_send_ad_all();
2416 }
2417 sc->sc_suppress = 1;
2418 } else {
2419 carp_set_state(sc, INIT);
2420 carp_setrun(sc, 0);
2421 if (sc->sc_suppress)
2422 carp_suppress_preempt--;
2423 sc->sc_suppress = 0;
2424 }
2425 }
2426
2427 static void
2428 carp_stop(struct carp_softc *sc, int detach)
2429 {
2430 sc->sc_if.if_flags &= ~IFF_RUNNING;
2431
2432 callout_stop(&sc->sc_ad_tmo);
2433 callout_stop(&sc->sc_md_tmo);
2434 callout_stop(&sc->sc_md6_tmo);
2435
2436 if (!detach && sc->sc_state == MASTER)
2437 carp_send_ad(sc);
2438
2439 if (sc->sc_suppress)
2440 carp_suppress_preempt--;
2441 sc->sc_suppress = 0;
2442
2443 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
2444 carp_suppress_preempt--;
2445 sc->sc_sendad_errors = 0;
2446 sc->sc_sendad_success = 0;
2447
2448 carp_set_state(sc, INIT);
2449 carp_setrun(sc, 0);
2450 }
2451
2452 static void
2453 carp_suspend(struct carp_softc *sc, int detach)
2454 {
2455 struct ifnet *cifp = &sc->sc_if;
2456
2457 carp_stop(sc, detach);
2458
2459 /* Retain the running state, if we are not dead yet */
2460 if (!sc->sc_dead && (cifp->if_flags & IFF_UP))
2461 cifp->if_flags |= IFF_RUNNING;
2462 }
2463
2464 static int
2465 carp_activate_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
2466 struct ifnet *ifp, struct in_ifaddr *ia_if, int own)
2467 {
2468 struct ip_moptions *imo = &sc->sc_imo;
2469 struct carp_if *cif;
2470 struct carp_softc *vr, *after = NULL;
2471 int onlist, error;
2472 #ifdef INVARIANTS
2473 int assert_onlist;
2474 #endif
2475
2476 KKASSERT(vha->vha_ia != NULL);
2477
2478 KASSERT(ia_if != NULL, ("NULL backing address\n"));
2479 KASSERT(vha->vha_iaback == NULL, ("%p is already activated\n", vha));
2480 KASSERT((vha->vha_flags & CARP_VHAF_OWNER) == 0,
2481 ("inactive vhaddr %p is the address owner\n", vha));
2482
2483 KASSERT(sc->sc_carpdev == NULL || sc->sc_carpdev == ifp,
2484 ("%s is already on %s\n", sc->sc_if.if_xname,
2485 sc->sc_carpdev->if_xname));
2486
2487 if (!ifp->if_carp) {
2488 KASSERT(sc->sc_carpdev == NULL,
2489 ("%s is already on %s\n", sc->sc_if.if_xname,
2490 sc->sc_carpdev->if_xname));
2491
2492 cif = kmalloc(sizeof(*cif), M_CARP, M_WAITOK | M_ZERO);
2493
2494 error = ifpromisc(ifp, 1);
2495 if (error) {
2496 kfree(cif, M_CARP);
2497 return error;
2498 }
2499
2500 TAILQ_INIT(&cif->vhif_vrs);
2501 ifp->if_carp = cif;
2502 } else {
2503 cif = ifp->if_carp;
2504 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
2505 if (vr != sc && vr->sc_vhid == sc->sc_vhid)
2506 return EINVAL;
2507 }
2508 }
2509
2510 #ifdef INVARIANTS
2511 if (sc->sc_carpdev != NULL)
2512 assert_onlist = 1;
2513 else
2514 assert_onlist = 0;
2515 #endif
2516 sc->sc_ia = ia_if;
2517 sc->sc_carpdev = ifp;
2518
2519 cif = ifp->if_carp;
2520 onlist = 0;
2521 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
2522 if (vr == sc)
2523 onlist = 1;
2524 if (vr->sc_vhid < sc->sc_vhid)
2525 after = vr;
2526 }
2527
2528 #ifdef INVARIANTS
2529 if (assert_onlist) {
2530 KASSERT(onlist, ("%s is not on %s carp list\n",
2531 sc->sc_if.if_xname, ifp->if_xname));
2532 } else {
2533 KASSERT(!onlist, ("%s is already on %s carp list\n",
2534 sc->sc_if.if_xname, ifp->if_xname));
2535 }
2536 #endif
2537
2538 if (!onlist) {
2539 /* We're trying to keep things in order */
2540 if (after == NULL)
2541 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
2542 else
2543 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
2544 }
2545
2546 vha->vha_iaback = ia_if;
2547 sc->sc_naddrs++;
2548
2549 if (own) {
2550 vha->vha_flags |= CARP_VHAF_OWNER;
2551
2552 /* XXX save user configured advskew? */
2553 sc->sc_advskew = 0;
2554 }
2555
2556 carp_addroute_vhaddr(sc, vha);
2557
2558 /*
2559 * Join the multicast group only after the backing interface
2560 * has been hooked with the CARP interface.
2561 */
2562 KASSERT(imo->imo_multicast_ifp == NULL ||
2563 imo->imo_multicast_ifp == &sc->sc_if,
2564 ("%s didn't leave mcast group on %s\n",
2565 sc->sc_if.if_xname, imo->imo_multicast_ifp->if_xname));
2566
2567 if (imo->imo_num_memberships == 0) {
2568 struct in_addr addr;
2569
2570 addr.s_addr = htonl(INADDR_CARP_GROUP);
2571 imo->imo_membership[0] = in_addmulti(&addr, &sc->sc_if);
2572 if (imo->imo_membership[0] == NULL) {
2573 carp_deactivate_vhaddr(sc, vha, FALSE);
2574 return ENOBUFS;
2575 }
2576
2577 imo->imo_num_memberships++;
2578 imo->imo_multicast_ifp = &sc->sc_if;
2579 imo->imo_multicast_ttl = CARP_DFLTTL;
2580 imo->imo_multicast_loop = 0;
2581 }
2582
2583 carp_hmac_prepare(sc);
2584 carp_set_state(sc, INIT);
2585 carp_setrun(sc, 0);
2586 return 0;
2587 }
2588
2589 static void
2590 carp_deactivate_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
2591 boolean_t del_iaback)
2592 {
2593 KKASSERT(vha->vha_ia != NULL);
2594
2595 carp_hmac_prepare(sc);
2596
2597 if (vha->vha_iaback == NULL) {
2598 KASSERT((vha->vha_flags & CARP_VHAF_OWNER) == 0,
2599 ("inactive vhaddr %p is the address owner\n", vha));
2600 return;
2601 }
2602
2603 vha->vha_flags &= ~CARP_VHAF_OWNER;
2604 carp_delroute_vhaddr(sc, vha, del_iaback);
2605
2606 KKASSERT(sc->sc_naddrs > 0);
2607 vha->vha_iaback = NULL;
2608 sc->sc_naddrs--;
2609 if (!sc->sc_naddrs) {
2610 if (sc->sc_naddrs6) {
2611 carp_multicast_cleanup(sc);
2612 sc->sc_ia = NULL;
2613 } else {
2614 carp_detach(sc, 0, del_iaback);
2615 }
2616 }
2617 }
2618
2619 static void
2620 carp_link_addrs(struct carp_softc *sc, struct ifnet *ifp, struct ifaddr *ifa_if)
2621 {
2622 struct carp_vhaddr *vha;
2623 struct in_ifaddr *ia_if;
2624
2625 KKASSERT(ifa_if->ifa_addr->sa_family == AF_INET);
2626 ia_if = ifatoia(ifa_if);
2627
2628 /*
2629 * Test each inactive vhaddr against the newly added address.
2630 * If the newly added address could be the backing address,
2631 * then activate the matching vhaddr.
2632 */
2633 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
2634 const struct in_ifaddr *ia;
2635 u_long iaddr;
2636 int own;
2637
2638 if (vha->vha_iaback != NULL)
2639 continue;
2640
2641 ia = vha->vha_ia;
2642 iaddr = ntohl(ia->ia_addr.sin_addr.s_addr);
2643
2644 if ((iaddr & ia_if->ia_subnetmask) != ia_if->ia_subnet)
2645 continue;
2646
2647 own = 0;
2648 if (ia->ia_addr.sin_addr.s_addr ==
2649 ia_if->ia_addr.sin_addr.s_addr)
2650 own = 1;
2651
2652 carp_activate_vhaddr(sc, vha, ifp, ia_if, own);
2653 }
2654 }
2655
2656 static void
2657 carp_unlink_addrs(struct carp_softc *sc, struct ifnet *ifp,
2658 struct ifaddr *ifa_if)
2659 {
2660 struct carp_vhaddr *vha;
2661 struct in_ifaddr *ia_if;
2662
2663 KKASSERT(ifa_if->ifa_addr->sa_family == AF_INET);
2664 ia_if = ifatoia(ifa_if);
2665
2666 /*
2667 * Ad src address is deleted; set it to NULL.
2668 * Following loop will try pick up a new ad src address
2669 * if one of the vhaddr could retain its backing address.
2670 */
2671 if (sc->sc_ia == ia_if)
2672 sc->sc_ia = NULL;
2673
2674 /*
2675 * Test each active vhaddr against the deleted address.
2676 * If the deleted address is vhaddr address's backing
2677 * address, then deactivate the vhaddr.
2678 */
2679 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
2680 if (vha->vha_iaback == NULL)
2681 continue;
2682
2683 if (vha->vha_iaback == ia_if)
2684 carp_deactivate_vhaddr(sc, vha, TRUE);
2685 else if (sc->sc_ia == NULL)
2686 sc->sc_ia = vha->vha_iaback;
2687 }
2688 }
2689
2690 static void
2691 carp_update_addrs(struct carp_softc *sc, struct ifaddr *ifa_del)
2692 {
2693 struct carp_vhaddr *vha;
2694
2695 KKASSERT(sc->sc_carpdev == NULL);
2696
2697 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
2698 carp_config_vhaddr(sc, vha, ifatoia(ifa_del));
2699 }
2700
2701 static void
2702 carp_ifaddr(void *arg __unused, struct ifnet *ifp,
2703 enum ifaddr_event event, struct ifaddr *ifa)
2704 {
2705 struct carp_softc *sc;
2706
2707 carp_gettok();
2708
2709 if (ifa->ifa_addr->sa_family != AF_INET)
2710 goto back;
2711
2712 KASSERT(&curthread->td_msgport == cpu_portfn(0),
2713 ("not in netisr0"));
2714
2715 if (ifp->if_type == IFT_CARP) {
2716 /*
2717 * Address is changed on carp(4) interface
2718 */
2719 switch (event) {
2720 case IFADDR_EVENT_ADD:
2721 carp_add_addr(ifp->if_softc, ifa);
2722 break;
2723
2724 case IFADDR_EVENT_CHANGE:
2725 carp_config_addr(ifp->if_softc, ifa);
2726 break;
2727
2728 case IFADDR_EVENT_DELETE:
2729 carp_del_addr(ifp->if_softc, ifa);
2730 break;
2731 }
2732 goto back;
2733 }
2734
2735 /*
2736 * Address is changed on non-carp(4) interface
2737 */
2738 if ((ifp->if_flags & IFF_MULTICAST) == 0)
2739 goto back;
2740
2741 LIST_FOREACH(sc, &carpif_list, sc_next) {
2742 if (sc->sc_carpdev != NULL && sc->sc_carpdev != ifp) {
2743 /* Not the parent iface; skip */
2744 continue;
2745 }
2746
2747 switch (event) {
2748 case IFADDR_EVENT_ADD:
2749 carp_link_addrs(sc, ifp, ifa);
2750 break;
2751
2752 case IFADDR_EVENT_DELETE:
2753 if (sc->sc_carpdev != NULL) {
2754 carp_unlink_addrs(sc, ifp, ifa);
2755 if (sc->sc_carpdev == NULL) {
2756 /*
2757 * We no longer have the parent
2758 * interface, however, certain
2759 * virtual addresses, which are
2760 * not used because they can't
2761 * match the previous parent
2762 * interface's addresses, may now
2763 * match different interface's
2764 * addresses.
2765 */
2766 carp_update_addrs(sc, ifa);
2767 }
2768 } else {
2769 /*
2770 * The carp(4) interface didn't have a
2771 * parent iface, so it is not possible
2772 * that it will contain any address to
2773 * be unlinked.
2774 */
2775 }
2776 break;
2777
2778 case IFADDR_EVENT_CHANGE:
2779 if (sc->sc_carpdev == NULL) {
2780 /*
2781 * The carp(4) interface didn't have a
2782 * parent iface, so it is not possible
2783 * that it will contain any address to
2784 * be updated.
2785 */
2786 carp_link_addrs(sc, ifp, ifa);
2787 } else {
2788 /*
2789 * First try breaking tie with the old
2790 * address. Then see whether we could
2791 * link certain vhaddr to the new address.
2792 * If that fails, i.e. carpdev is NULL,
2793 * we try a global update.
2794 *
2795 * NOTE: The above order is critical.
2796 */
2797 carp_unlink_addrs(sc, ifp, ifa);
2798 carp_link_addrs(sc, ifp, ifa);
2799 if (sc->sc_carpdev == NULL) {
2800 /*
2801 * See the comment in the above
2802 * IFADDR_EVENT_DELETE block.
2803 */
2804 carp_update_addrs(sc, NULL);
2805 }
2806 }
2807 break;
2808 }
2809 }
2810
2811 back:
2812 carp_reltok();
2813 }
2814
2815 void
2816 carp_proto_ctlinput(netmsg_t msg)
2817 {
2818 int cmd = msg->ctlinput.nm_cmd;
2819 struct sockaddr *sa = msg->ctlinput.nm_arg;
2820 struct in_ifaddr_container *iac;
2821
2822 carp_gettok();
2823
2824 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
2825 struct in_ifaddr *ia = iac->ia;
2826 struct ifnet *ifp = ia->ia_ifp;
2827
2828 if (ifp->if_type == IFT_CARP)
2829 continue;
2830
2831 if (ia->ia_ifa.ifa_addr == sa) {
2832 if (cmd == PRC_IFDOWN) {
2833 carp_ifaddr(NULL, ifp, IFADDR_EVENT_DELETE,
2834 &ia->ia_ifa);
2835 } else if (cmd == PRC_IFUP) {
2836 carp_ifaddr(NULL, ifp, IFADDR_EVENT_ADD,
2837 &ia->ia_ifa);
2838 }
2839 break;
2840 }
2841 }
2842
2843 carp_reltok();
2844 lwkt_replymsg(&msg->lmsg, 0);
2845 }
2846
2847 void
2848 carp_gettok(void)
2849 {
2850 lwkt_gettoken(&carp_tok);
2851 }
2852
2853 void
2854 carp_reltok(void)
2855 {
2856 lwkt_reltoken(&carp_tok);
2857 }
2858
2859 struct ifnet *
2860 carp_parent(struct ifnet *cifp)
2861 {
2862 struct carp_softc *sc;
2863
2864 ASSERT_LWKT_TOKEN_HELD(&carp_tok);
2865
2866 KKASSERT(cifp->if_type == IFT_CARP);
2867 sc = cifp->if_softc;
2868
2869 return sc->sc_carpdev;
2870 }
2871
2872 #define rtinitflags(x) \
2873 (((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) \
2874 ? RTF_HOST : 0)
2875
2876 static int
2877 carp_addroute_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha)
2878 {
2879 struct in_ifaddr *ia, *iaback;
2880 int error;
2881
2882 if (sc->sc_state != MASTER)
2883 return 0;
2884
2885 ia = vha->vha_ia;
2886 KKASSERT(ia != NULL);
2887
2888 iaback = vha->vha_iaback;
2889 KKASSERT(iaback != NULL);
2890
2891 rtinit(&iaback->ia_ifa, RTM_DELETE, rtinitflags(iaback));
2892 in_ifadown(&iaback->ia_ifa, 1);
2893 iaback->ia_flags &= ~IFA_ROUTE;
2894
2895 error = rtinit(&ia->ia_ifa, RTM_ADD, rtinitflags(ia) | RTF_UP);
2896 if (!error)
2897 ia->ia_flags |= IFA_ROUTE;
2898 return error;
2899 }
2900
2901 static void
2902 carp_delroute_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
2903 boolean_t del_iaback)
2904 {
2905 struct in_ifaddr *ia, *iaback;
2906
2907 ia = vha->vha_ia;
2908 KKASSERT(ia != NULL);
2909
2910 iaback = vha->vha_iaback;
2911 KKASSERT(iaback != NULL);
2912
2913 rtinit(&ia->ia_ifa, RTM_DELETE, rtinitflags(ia));
2914 in_ifadown(&ia->ia_ifa, 1);
2915 ia->ia_flags &= ~IFA_ROUTE;
2916
2917 if (!del_iaback && (iaback->ia_ifp->if_flags & IFF_UP)) {
2918 int error;
2919
2920 error = rtinit(&iaback->ia_ifa, RTM_ADD,
2921 rtinitflags(iaback) | RTF_UP);
2922 if (!error)
2923 iaback->ia_flags |= IFA_ROUTE;
2924 }
2925 }
2926
2927 static int
2928 carp_modevent(module_t mod, int type, void *data)
2929 {
2930 switch (type) {
2931 case MOD_LOAD:
2932 LIST_INIT(&carpif_list);
2933 carp_ifdetach_event =
2934 EVENTHANDLER_REGISTER(ifnet_detach_event, carp_ifdetach, NULL,
2935 EVENTHANDLER_PRI_ANY);
2936 carp_ifaddr_event =
2937 EVENTHANDLER_REGISTER(ifaddr_event, carp_ifaddr, NULL,
2938 EVENTHANDLER_PRI_FIRST);
2939 if_clone_attach(&carp_cloner);
2940 break;
2941
2942 case MOD_UNLOAD:
2943 EVENTHANDLER_DEREGISTER(ifnet_detach_event,
2944 carp_ifdetach_event);
2945 EVENTHANDLER_DEREGISTER(ifaddr_event,
2946 carp_ifaddr_event);
2947 if_clone_detach(&carp_cloner);
2948 break;
2949
2950 default:
2951 return (EINVAL);
2952 }
2953 return (0);
2954 }
2955
2956 static moduledata_t carp_mod = {
2957 "carp",
2958 carp_modevent,
2959 0
2960 };
2961 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
DragonFly BSD