1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2002 Michael Shalayeff.
5 * Copyright (c) 2003 Ryan McBride.
6 * Copyright (c) 2011 Gleb Smirnoff <[email protected]>
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
22 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
26 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
27 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28 * THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include <sys/cdefs.h>
32 #include "opt_bpf.h"
33 #include "opt_inet.h"
34 #include "opt_inet6.h"
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/devctl.h>
39 #include <sys/jail.h>
40 #include <sys/kernel.h>
41 #include <sys/limits.h>
42 #include <sys/malloc.h>
43 #include <sys/mbuf.h>
44 #include <sys/module.h>
45 #include <sys/priv.h>
46 #include <sys/proc.h>
47 #include <sys/socket.h>
48 #include <sys/sockio.h>
49 #include <sys/sysctl.h>
50 #include <sys/syslog.h>
51 #include <sys/taskqueue.h>
52 #include <sys/counter.h>
53
54 #include <net/ethernet.h>
55 #include <net/if.h>
56 #include <net/if_var.h>
57 #include <net/if_dl.h>
58 #include <net/if_llatbl.h>
59 #include <net/if_private.h>
60 #include <net/if_types.h>
61 #include <net/route.h>
62 #include <net/vnet.h>
63
64 #if defined(INET) || defined(INET6)
65 #include <netinet/in.h>
66 #include <netinet/in_var.h>
67 #include <netinet/ip_carp.h>
68 #include <netinet/ip_carp_nl.h>
69 #include <netinet/ip.h>
70 #include <machine/in_cksum.h>
71 #endif
72 #ifdef INET
73 #include <netinet/ip_var.h>
74 #include <netinet/if_ether.h>
75 #endif
76
77 #ifdef INET6
78 #include <netinet/icmp6.h>
79 #include <netinet/ip6.h>
80 #include <netinet6/in6_var.h>
81 #include <netinet6/ip6_var.h>
82 #include <netinet6/scope6_var.h>
83 #include <netinet6/nd6.h>
84 #endif
85
86 #include <netlink/netlink.h>
87 #include <netlink/netlink_ctl.h>
88 #include <netlink/netlink_generic.h>
89 #include <netlink/netlink_message_parser.h>
90
91 #include <crypto/sha1.h>
92
93 static MALLOC_DEFINE(M_CARP, "CARP", "CARP addresses");
94
95 struct carp_softc {
96 struct ifnet *sc_carpdev; /* Pointer to parent ifnet. */
97 struct ifaddr **sc_ifas; /* Our ifaddrs. */
98 struct sockaddr_dl sc_addr; /* Our link level address. */
99 struct callout sc_ad_tmo; /* Advertising timeout. */
100 #ifdef INET
101 struct callout sc_md_tmo; /* Master down timeout. */
102 #endif
103 #ifdef INET6
104 struct callout sc_md6_tmo; /* XXX: Master down timeout. */
105 #endif
106 struct mtx sc_mtx;
107
108 int sc_vhid;
109 int sc_advskew;
110 int sc_advbase;
111 struct in_addr sc_carpaddr;
112 struct in6_addr sc_carpaddr6;
113
114 int sc_naddrs;
115 int sc_naddrs6;
116 int sc_ifasiz;
117 enum { INIT = 0, BACKUP, MASTER } sc_state;
118 int sc_suppress;
119 int sc_sendad_errors;
120 #define CARP_SENDAD_MAX_ERRORS 3
121 int sc_sendad_success;
122 #define CARP_SENDAD_MIN_SUCCESS 3
123
124 int sc_init_counter;
125 uint64_t sc_counter;
126
127 /* authentication */
128 #define CARP_HMAC_PAD 64
129 unsigned char sc_key[CARP_KEY_LEN];
130 unsigned char sc_pad[CARP_HMAC_PAD];
131 SHA1_CTX sc_sha1;
132
133 TAILQ_ENTRY(carp_softc) sc_list; /* On the carp_if list. */
134 LIST_ENTRY(carp_softc) sc_next; /* On the global list. */
135 };
136
137 struct carp_if {
138 #ifdef INET
139 int cif_naddrs;
140 #endif
141 #ifdef INET6
142 int cif_naddrs6;
143 #endif
144 TAILQ_HEAD(, carp_softc) cif_vrs;
145 #ifdef INET
146 struct ip_moptions cif_imo;
147 #endif
148 #ifdef INET6
149 struct ip6_moptions cif_im6o;
150 #endif
151 struct ifnet *cif_ifp;
152 struct mtx cif_mtx;
153 uint32_t cif_flags;
154 #define CIF_PROMISC 0x00000001
155 };
156
157 /* Kernel equivalent of struct carpreq, but with more fields for new features.
158 * */
159 struct carpkreq {
160 int carpr_count;
161 int carpr_vhid;
162 int carpr_state;
163 int carpr_advskew;
164 int carpr_advbase;
165 unsigned char carpr_key[CARP_KEY_LEN];
166 /* Everything above this is identical to carpreq */
167 struct in_addr carpr_addr;
168 struct in6_addr carpr_addr6;
169 };
170
171 /*
172 * Brief design of carp(4).
173 *
174 * Any carp-capable ifnet may have a list of carp softcs hanging off
175 * its ifp->if_carp pointer. Each softc represents one unique virtual
176 * host id, or vhid. The softc has a back pointer to the ifnet. All
177 * softcs are joined in a global list, which has quite limited use.
178 *
179 * Any interface address that takes part in CARP negotiation has a
180 * pointer to the softc of its vhid, ifa->ifa_carp. That could be either
181 * AF_INET or AF_INET6 address.
182 *
183 * Although, one can get the softc's backpointer to ifnet and traverse
184 * through its ifp->if_addrhead queue to find all interface addresses
185 * involved in CARP, we keep a growable array of ifaddr pointers. This
186 * allows us to avoid grabbing the IF_ADDR_LOCK() in many traversals that
187 * do calls into the network stack, thus avoiding LORs.
188 *
189 * Locking:
190 *
191 * Each softc has a lock sc_mtx. It is used to synchronise carp_input_c(),
192 * callout-driven events and ioctl()s.
193 *
194 * To traverse the list of softcs on an ifnet we use CIF_LOCK() or carp_sx.
195 * To traverse the global list we use the mutex carp_mtx.
196 *
197 * Known issues with locking:
198 *
199 * - Sending ad, we put the pointer to the softc in an mtag, and no reference
200 * counting is done on the softc.
201 * - On module unload we may race (?) with packet processing thread
202 * dereferencing our function pointers.
203 */
204
205 /* Accept incoming CARP packets. */
206 VNET_DEFINE_STATIC(int, carp_allow) = 1;
207 #define V_carp_allow VNET(carp_allow)
208
209 /* Set DSCP in outgoing CARP packets. */
210 VNET_DEFINE_STATIC(int, carp_dscp) = 56;
211 #define V_carp_dscp VNET(carp_dscp)
212
213 /* Preempt slower nodes. */
214 VNET_DEFINE_STATIC(int, carp_preempt) = 0;
215 #define V_carp_preempt VNET(carp_preempt)
216
217 /* Log level. */
218 VNET_DEFINE_STATIC(int, carp_log) = 1;
219 #define V_carp_log VNET(carp_log)
220
221 /* Global advskew demotion. */
222 VNET_DEFINE_STATIC(int, carp_demotion) = 0;
223 #define V_carp_demotion VNET(carp_demotion)
224
225 /* Send error demotion factor. */
226 VNET_DEFINE_STATIC(int, carp_senderr_adj) = CARP_MAXSKEW;
227 #define V_carp_senderr_adj VNET(carp_senderr_adj)
228
229 /* Iface down demotion factor. */
230 VNET_DEFINE_STATIC(int, carp_ifdown_adj) = CARP_MAXSKEW;
231 #define V_carp_ifdown_adj VNET(carp_ifdown_adj)
232
233 static int carp_allow_sysctl(SYSCTL_HANDLER_ARGS);
234 static int carp_dscp_sysctl(SYSCTL_HANDLER_ARGS);
235 static int carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS);
236
237 SYSCTL_NODE(_net_inet, IPPROTO_CARP, carp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
238 "CARP");
239 SYSCTL_PROC(_net_inet_carp, OID_AUTO, allow,
240 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RWTUN | CTLFLAG_MPSAFE,
241 &VNET_NAME(carp_allow), 0, carp_allow_sysctl, "I",
242 "Accept incoming CARP packets");
243 SYSCTL_PROC(_net_inet_carp, OID_AUTO, dscp,
244 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
245 0, 0, carp_dscp_sysctl, "I",
246 "DSCP value for carp packets");
247 SYSCTL_INT(_net_inet_carp, OID_AUTO, preempt, CTLFLAG_VNET | CTLFLAG_RW,
248 &VNET_NAME(carp_preempt), 0, "High-priority backup preemption mode");
249 SYSCTL_INT(_net_inet_carp, OID_AUTO, log, CTLFLAG_VNET | CTLFLAG_RW,
250 &VNET_NAME(carp_log), 0, "CARP log level");
251 SYSCTL_PROC(_net_inet_carp, OID_AUTO, demotion,
252 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
253 0, 0, carp_demote_adj_sysctl, "I",
254 "Adjust demotion factor (skew of advskew)");
255 SYSCTL_INT(_net_inet_carp, OID_AUTO, senderr_demotion_factor,
256 CTLFLAG_VNET | CTLFLAG_RW,
257 &VNET_NAME(carp_senderr_adj), 0, "Send error demotion factor adjustment");
258 SYSCTL_INT(_net_inet_carp, OID_AUTO, ifdown_demotion_factor,
259 CTLFLAG_VNET | CTLFLAG_RW,
260 &VNET_NAME(carp_ifdown_adj), 0,
261 "Interface down demotion factor adjustment");
262
263 VNET_PCPUSTAT_DEFINE(struct carpstats, carpstats);
264 VNET_PCPUSTAT_SYSINIT(carpstats);
265 VNET_PCPUSTAT_SYSUNINIT(carpstats);
266
267 #define CARPSTATS_ADD(name, val) \
268 counter_u64_add(VNET(carpstats)[offsetof(struct carpstats, name) / \
269 sizeof(uint64_t)], (val))
270 #define CARPSTATS_INC(name) CARPSTATS_ADD(name, 1)
271
272 SYSCTL_VNET_PCPUSTAT(_net_inet_carp, OID_AUTO, stats, struct carpstats,
273 carpstats, "CARP statistics (struct carpstats, netinet/ip_carp.h)");
274
275 #define CARP_LOCK_INIT(sc) mtx_init(&(sc)->sc_mtx, "carp_softc", \
276 NULL, MTX_DEF)
277 #define CARP_LOCK_DESTROY(sc) mtx_destroy(&(sc)->sc_mtx)
278 #define CARP_LOCK_ASSERT(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED)
279 #define CARP_LOCK(sc) mtx_lock(&(sc)->sc_mtx)
280 #define CARP_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx)
281 #define CIF_LOCK_INIT(cif) mtx_init(&(cif)->cif_mtx, "carp_if", \
282 NULL, MTX_DEF)
283 #define CIF_LOCK_DESTROY(cif) mtx_destroy(&(cif)->cif_mtx)
284 #define CIF_LOCK_ASSERT(cif) mtx_assert(&(cif)->cif_mtx, MA_OWNED)
285 #define CIF_LOCK(cif) mtx_lock(&(cif)->cif_mtx)
286 #define CIF_UNLOCK(cif) mtx_unlock(&(cif)->cif_mtx)
287 #define CIF_FREE(cif) do { \
288 CIF_LOCK(cif); \
289 if (TAILQ_EMPTY(&(cif)->cif_vrs)) \
290 carp_free_if(cif); \
291 else \
292 CIF_UNLOCK(cif); \
293 } while (0)
294
295 #define CARP_LOG(...) do { \
296 if (V_carp_log > 0) \
297 log(LOG_INFO, "carp: " __VA_ARGS__); \
298 } while (0)
299
300 #define CARP_DEBUG(...) do { \
301 if (V_carp_log > 1) \
302 log(LOG_DEBUG, __VA_ARGS__); \
303 } while (0)
304
305 #define IFNET_FOREACH_IFA(ifp, ifa) \
306 CK_STAILQ_FOREACH((ifa), &(ifp)->if_addrhead, ifa_link) \
307 if ((ifa)->ifa_carp != NULL)
308
309 #define CARP_FOREACH_IFA(sc, ifa) \
310 CARP_LOCK_ASSERT(sc); \
311 for (int _i = 0; \
312 _i < (sc)->sc_naddrs + (sc)->sc_naddrs6 && \
313 ((ifa) = sc->sc_ifas[_i]) != NULL; \
314 ++_i)
315
316 #define IFNET_FOREACH_CARP(ifp, sc) \
317 KASSERT(mtx_owned(&ifp->if_carp->cif_mtx) || \
318 sx_xlocked(&carp_sx), ("cif_vrs not locked")); \
319 TAILQ_FOREACH((sc), &(ifp)->if_carp->cif_vrs, sc_list)
320
321 #define DEMOTE_ADVSKEW(sc) \
322 (((sc)->sc_advskew + V_carp_demotion > CARP_MAXSKEW) ? \
323 CARP_MAXSKEW : \
324 (((sc)->sc_advskew + V_carp_demotion < 0) ? \
325 0 : ((sc)->sc_advskew + V_carp_demotion)))
326
327 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t, int);
328 static struct carp_softc
329 *carp_alloc(struct ifnet *);
330 static void carp_destroy(struct carp_softc *);
331 static struct carp_if
332 *carp_alloc_if(struct ifnet *);
333 static void carp_free_if(struct carp_if *);
334 static void carp_set_state(struct carp_softc *, int, const char* reason);
335 static void carp_sc_state(struct carp_softc *);
336 static void carp_setrun(struct carp_softc *, sa_family_t);
337 static void carp_master_down(void *);
338 static void carp_master_down_locked(struct carp_softc *,
339 const char* reason);
340 static void carp_send_ad(void *);
341 static void carp_send_ad_locked(struct carp_softc *);
342 static void carp_addroute(struct carp_softc *);
343 static void carp_ifa_addroute(struct ifaddr *);
344 static void carp_delroute(struct carp_softc *);
345 static void carp_ifa_delroute(struct ifaddr *);
346 static void carp_send_ad_all(void *, int);
347 static void carp_demote_adj(int, char *);
348
349 static LIST_HEAD(, carp_softc) carp_list;
350 static struct mtx carp_mtx;
351 static struct sx carp_sx;
352 static struct task carp_sendall_task =
353 TASK_INITIALIZER(0, carp_send_ad_all, NULL);
354
355 static int
carp_is_supported_if(if_t ifp)356 carp_is_supported_if(if_t ifp)
357 {
358 if (ifp == NULL)
359 return (ENXIO);
360
361 switch (ifp->if_type) {
362 case IFT_ETHER:
363 case IFT_L2VLAN:
364 case IFT_BRIDGE:
365 break;
366 default:
367 return (EOPNOTSUPP);
368 }
369
370 return (0);
371 }
372
373 static void
carp_hmac_prepare(struct carp_softc * sc)374 carp_hmac_prepare(struct carp_softc *sc)
375 {
376 uint8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
377 uint8_t vhid = sc->sc_vhid & 0xff;
378 struct ifaddr *ifa;
379 int i, found;
380 #ifdef INET
381 struct in_addr last, cur, in;
382 #endif
383 #ifdef INET6
384 struct in6_addr last6, cur6, in6;
385 #endif
386
387 CARP_LOCK_ASSERT(sc);
388
389 /* Compute ipad from key. */
390 bzero(sc->sc_pad, sizeof(sc->sc_pad));
391 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
392 for (i = 0; i < sizeof(sc->sc_pad); i++)
393 sc->sc_pad[i] ^= 0x36;
394
395 /* Precompute first part of inner hash. */
396 SHA1Init(&sc->sc_sha1);
397 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
398 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
399 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
400 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
401 #ifdef INET
402 cur.s_addr = 0;
403 do {
404 found = 0;
405 last = cur;
406 cur.s_addr = 0xffffffff;
407 CARP_FOREACH_IFA(sc, ifa) {
408 in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr;
409 if (ifa->ifa_addr->sa_family == AF_INET &&
410 ntohl(in.s_addr) > ntohl(last.s_addr) &&
411 ntohl(in.s_addr) < ntohl(cur.s_addr)) {
412 cur.s_addr = in.s_addr;
413 found++;
414 }
415 }
416 if (found)
417 SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur));
418 } while (found);
419 #endif /* INET */
420 #ifdef INET6
421 memset(&cur6, 0, sizeof(cur6));
422 do {
423 found = 0;
424 last6 = cur6;
425 memset(&cur6, 0xff, sizeof(cur6));
426 CARP_FOREACH_IFA(sc, ifa) {
427 in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
428 if (IN6_IS_SCOPE_EMBED(&in6))
429 in6.s6_addr16[1] = 0;
430 if (ifa->ifa_addr->sa_family == AF_INET6 &&
431 memcmp(&in6, &last6, sizeof(in6)) > 0 &&
432 memcmp(&in6, &cur6, sizeof(in6)) < 0) {
433 cur6 = in6;
434 found++;
435 }
436 }
437 if (found)
438 SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6));
439 } while (found);
440 #endif /* INET6 */
441
442 /* convert ipad to opad */
443 for (i = 0; i < sizeof(sc->sc_pad); i++)
444 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
445 }
446
447 static void
carp_hmac_generate(struct carp_softc * sc,uint32_t counter[2],unsigned char md[20])448 carp_hmac_generate(struct carp_softc *sc, uint32_t counter[2],
449 unsigned char md[20])
450 {
451 SHA1_CTX sha1ctx;
452
453 CARP_LOCK_ASSERT(sc);
454
455 /* fetch first half of inner hash */
456 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
457
458 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
459 SHA1Final(md, &sha1ctx);
460
461 /* outer hash */
462 SHA1Init(&sha1ctx);
463 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
464 SHA1Update(&sha1ctx, md, 20);
465 SHA1Final(md, &sha1ctx);
466 }
467
468 static int
carp_hmac_verify(struct carp_softc * sc,uint32_t counter[2],unsigned char md[20])469 carp_hmac_verify(struct carp_softc *sc, uint32_t counter[2],
470 unsigned char md[20])
471 {
472 unsigned char md2[20];
473
474 CARP_LOCK_ASSERT(sc);
475
476 carp_hmac_generate(sc, counter, md2);
477
478 return (bcmp(md, md2, sizeof(md2)));
479 }
480
481 /*
482 * process input packet.
483 * we have rearranged checks order compared to the rfc,
484 * but it seems more efficient this way or not possible otherwise.
485 */
486 #ifdef INET
487 static int
carp_input(struct mbuf ** mp,int * offp,int proto)488 carp_input(struct mbuf **mp, int *offp, int proto)
489 {
490 struct mbuf *m = *mp;
491 struct ip *ip = mtod(m, struct ip *);
492 struct carp_header *ch;
493 int iplen, len;
494
495 iplen = *offp;
496 *mp = NULL;
497
498 CARPSTATS_INC(carps_ipackets);
499
500 if (!V_carp_allow) {
501 m_freem(m);
502 return (IPPROTO_DONE);
503 }
504
505 iplen = ip->ip_hl << 2;
506
507 if (m->m_pkthdr.len < iplen + sizeof(*ch)) {
508 CARPSTATS_INC(carps_badlen);
509 CARP_DEBUG("%s: received len %zd < sizeof(struct carp_header) "
510 "on %s\n", __func__, m->m_len - sizeof(struct ip),
511 if_name(m->m_pkthdr.rcvif));
512 m_freem(m);
513 return (IPPROTO_DONE);
514 }
515
516 if (iplen + sizeof(*ch) < m->m_len) {
517 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) {
518 CARPSTATS_INC(carps_hdrops);
519 CARP_DEBUG("%s: pullup failed\n", __func__);
520 return (IPPROTO_DONE);
521 }
522 ip = mtod(m, struct ip *);
523 }
524 ch = (struct carp_header *)((char *)ip + iplen);
525
526 /*
527 * verify that the received packet length is
528 * equal to the CARP header
529 */
530 len = iplen + sizeof(*ch);
531 if (len > m->m_pkthdr.len) {
532 CARPSTATS_INC(carps_badlen);
533 CARP_DEBUG("%s: packet too short %d on %s\n", __func__,
534 m->m_pkthdr.len,
535 if_name(m->m_pkthdr.rcvif));
536 m_freem(m);
537 return (IPPROTO_DONE);
538 }
539
540 if ((m = m_pullup(m, len)) == NULL) {
541 CARPSTATS_INC(carps_hdrops);
542 return (IPPROTO_DONE);
543 }
544 ip = mtod(m, struct ip *);
545 ch = (struct carp_header *)((char *)ip + iplen);
546
547 /* verify the CARP checksum */
548 m->m_data += iplen;
549 if (in_cksum(m, len - iplen)) {
550 CARPSTATS_INC(carps_badsum);
551 CARP_DEBUG("%s: checksum failed on %s\n", __func__,
552 if_name(m->m_pkthdr.rcvif));
553 m_freem(m);
554 return (IPPROTO_DONE);
555 }
556 m->m_data -= iplen;
557
558 carp_input_c(m, ch, AF_INET, ip->ip_ttl);
559 return (IPPROTO_DONE);
560 }
561 #endif
562
563 #ifdef INET6
564 static int
carp6_input(struct mbuf ** mp,int * offp,int proto)565 carp6_input(struct mbuf **mp, int *offp, int proto)
566 {
567 struct mbuf *m = *mp;
568 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
569 struct carp_header *ch;
570 u_int len;
571
572 CARPSTATS_INC(carps_ipackets6);
573
574 if (!V_carp_allow) {
575 m_freem(m);
576 return (IPPROTO_DONE);
577 }
578
579 /* check if received on a valid carp interface */
580 if (m->m_pkthdr.rcvif->if_carp == NULL) {
581 CARPSTATS_INC(carps_badif);
582 CARP_DEBUG("%s: packet received on non-carp interface: %s\n",
583 __func__, if_name(m->m_pkthdr.rcvif));
584 m_freem(m);
585 return (IPPROTO_DONE);
586 }
587
588 /* verify that we have a complete carp packet */
589 if (m->m_len < *offp + sizeof(*ch)) {
590 len = m->m_len;
591 m = m_pullup(m, *offp + sizeof(*ch));
592 if (m == NULL) {
593 CARPSTATS_INC(carps_badlen);
594 CARP_DEBUG("%s: packet size %u too small\n", __func__, len);
595 return (IPPROTO_DONE);
596 }
597 ip6 = mtod(m, struct ip6_hdr *);
598 }
599 ch = (struct carp_header *)(mtod(m, char *) + *offp);
600
601 /* verify the CARP checksum */
602 m->m_data += *offp;
603 if (in_cksum(m, sizeof(*ch))) {
604 CARPSTATS_INC(carps_badsum);
605 CARP_DEBUG("%s: checksum failed, on %s\n", __func__,
606 if_name(m->m_pkthdr.rcvif));
607 m_freem(m);
608 return (IPPROTO_DONE);
609 }
610 m->m_data -= *offp;
611
612 carp_input_c(m, ch, AF_INET6, ip6->ip6_hlim);
613 return (IPPROTO_DONE);
614 }
615 #endif /* INET6 */
616
617 /*
618 * This routine should not be necessary at all, but some switches
619 * (VMWare ESX vswitches) can echo our own packets back at us,
620 * and we must ignore them or they will cause us to drop out of
621 * MASTER mode.
622 *
623 * We cannot catch all cases of network loops. Instead, what we
624 * do here is catch any packet that arrives with a carp header
625 * with a VHID of 0, that comes from an address that is our own.
626 * These packets are by definition "from us" (even if they are from
627 * a misconfigured host that is pretending to be us).
628 *
629 * The VHID test is outside this mini-function.
630 */
631 static int
carp_source_is_self(struct mbuf * m,struct ifaddr * ifa,sa_family_t af)632 carp_source_is_self(struct mbuf *m, struct ifaddr *ifa, sa_family_t af)
633 {
634 #ifdef INET
635 struct ip *ip4;
636 struct in_addr in4;
637 #endif
638 #ifdef INET6
639 struct ip6_hdr *ip6;
640 struct in6_addr in6;
641 #endif
642
643 switch (af) {
644 #ifdef INET
645 case AF_INET:
646 ip4 = mtod(m, struct ip *);
647 in4 = ifatoia(ifa)->ia_addr.sin_addr;
648 return (in4.s_addr == ip4->ip_src.s_addr);
649 #endif
650 #ifdef INET6
651 case AF_INET6:
652 ip6 = mtod(m, struct ip6_hdr *);
653 in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
654 return (memcmp(&in6, &ip6->ip6_src, sizeof(in6)) == 0);
655 #endif
656 default:
657 break;
658 }
659 return (0);
660 }
661
662 static void
carp_input_c(struct mbuf * m,struct carp_header * ch,sa_family_t af,int ttl)663 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af, int ttl)
664 {
665 struct ifnet *ifp = m->m_pkthdr.rcvif;
666 struct ifaddr *ifa, *match;
667 struct carp_softc *sc;
668 uint64_t tmp_counter;
669 struct timeval sc_tv, ch_tv;
670 int error;
671 bool multicast = false;
672
673 NET_EPOCH_ASSERT();
674
675 /*
676 * Verify that the VHID is valid on the receiving interface.
677 *
678 * There should be just one match. If there are none
679 * the VHID is not valid and we drop the packet. If
680 * there are multiple VHID matches, take just the first
681 * one, for compatibility with previous code. While we're
682 * scanning, check for obvious loops in the network topology
683 * (these should never happen, and as noted above, we may
684 * miss real loops; this is just a double-check).
685 */
686 error = 0;
687 match = NULL;
688 IFNET_FOREACH_IFA(ifp, ifa) {
689 if (match == NULL && ifa->ifa_carp != NULL &&
690 ifa->ifa_addr->sa_family == af &&
691 ifa->ifa_carp->sc_vhid == ch->carp_vhid)
692 match = ifa;
693 if (ch->carp_vhid == 0 && carp_source_is_self(m, ifa, af))
694 error = ELOOP;
695 }
696 ifa = error ? NULL : match;
697 if (ifa != NULL)
698 ifa_ref(ifa);
699
700 if (ifa == NULL) {
701 if (error == ELOOP) {
702 CARP_DEBUG("dropping looped packet on interface %s\n",
703 if_name(ifp));
704 CARPSTATS_INC(carps_badif); /* ??? */
705 } else {
706 CARPSTATS_INC(carps_badvhid);
707 }
708 m_freem(m);
709 return;
710 }
711
712 /* verify the CARP version. */
713 if (ch->carp_version != CARP_VERSION) {
714 CARPSTATS_INC(carps_badver);
715 CARP_DEBUG("%s: invalid version %d\n", if_name(ifp),
716 ch->carp_version);
717 ifa_free(ifa);
718 m_freem(m);
719 return;
720 }
721
722 sc = ifa->ifa_carp;
723 CARP_LOCK(sc);
724 if (ifa->ifa_addr->sa_family == AF_INET) {
725 multicast = IN_MULTICAST(sc->sc_carpaddr.s_addr);
726 } else {
727 multicast = IN6_IS_ADDR_MULTICAST(&sc->sc_carpaddr6);
728 }
729 ifa_free(ifa);
730
731 /* verify that the IP TTL is 255, but only if we're not in unicast mode. */
732 if (multicast && ttl != CARP_DFLTTL) {
733 CARPSTATS_INC(carps_badttl);
734 CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__,
735 ttl, if_name(m->m_pkthdr.rcvif));
736 goto out;
737 }
738
739 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
740 CARPSTATS_INC(carps_badauth);
741 CARP_DEBUG("%s: incorrect hash for VHID %u@%s\n", __func__,
742 sc->sc_vhid, if_name(ifp));
743 goto out;
744 }
745
746 tmp_counter = ntohl(ch->carp_counter[0]);
747 tmp_counter = tmp_counter<<32;
748 tmp_counter += ntohl(ch->carp_counter[1]);
749
750 /* XXX Replay protection goes here */
751
752 sc->sc_init_counter = 0;
753 sc->sc_counter = tmp_counter;
754
755 sc_tv.tv_sec = sc->sc_advbase;
756 sc_tv.tv_usec = DEMOTE_ADVSKEW(sc) * 1000000 / 256;
757 ch_tv.tv_sec = ch->carp_advbase;
758 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
759
760 switch (sc->sc_state) {
761 case INIT:
762 break;
763 case MASTER:
764 /*
765 * If we receive an advertisement from a master who's going to
766 * be more frequent than us, go into BACKUP state.
767 */
768 if (timevalcmp(&sc_tv, &ch_tv, >) ||
769 timevalcmp(&sc_tv, &ch_tv, ==)) {
770 callout_stop(&sc->sc_ad_tmo);
771 carp_set_state(sc, BACKUP,
772 "more frequent advertisement received");
773 carp_setrun(sc, 0);
774 carp_delroute(sc);
775 }
776 break;
777 case BACKUP:
778 /*
779 * If we're pre-empting masters who advertise slower than us,
780 * and this one claims to be slower, treat him as down.
781 */
782 if (V_carp_preempt && timevalcmp(&sc_tv, &ch_tv, <)) {
783 carp_master_down_locked(sc,
784 "preempting a slower master");
785 break;
786 }
787
788 /*
789 * If the master is going to advertise at such a low frequency
790 * that he's guaranteed to time out, we'd might as well just
791 * treat him as timed out now.
792 */
793 sc_tv.tv_sec = sc->sc_advbase * 3;
794 if (timevalcmp(&sc_tv, &ch_tv, <)) {
795 carp_master_down_locked(sc, "master will time out");
796 break;
797 }
798
799 /*
800 * Otherwise, we reset the counter and wait for the next
801 * advertisement.
802 */
803 carp_setrun(sc, af);
804 break;
805 }
806
807 out:
808 CARP_UNLOCK(sc);
809 m_freem(m);
810 }
811
812 static int
carp_prepare_ad(struct mbuf * m,struct carp_softc * sc,struct carp_header * ch)813 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch)
814 {
815 struct m_tag *mtag;
816
817 if (sc->sc_init_counter) {
818 /* this could also be seconds since unix epoch */
819 sc->sc_counter = arc4random();
820 sc->sc_counter = sc->sc_counter << 32;
821 sc->sc_counter += arc4random();
822 } else
823 sc->sc_counter++;
824
825 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff);
826 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff);
827
828 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
829
830 /* Tag packet for carp_output */
831 if ((mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct carp_softc *),
832 M_NOWAIT)) == NULL) {
833 m_freem(m);
834 CARPSTATS_INC(carps_onomem);
835 return (ENOMEM);
836 }
837 bcopy(&sc, mtag + 1, sizeof(sc));
838 m_tag_prepend(m, mtag);
839
840 return (0);
841 }
842
843 /*
844 * To avoid LORs and possible recursions this function shouldn't
845 * be called directly, but scheduled via taskqueue.
846 */
847 static void
carp_send_ad_all(void * ctx __unused,int pending __unused)848 carp_send_ad_all(void *ctx __unused, int pending __unused)
849 {
850 struct carp_softc *sc;
851 struct epoch_tracker et;
852
853 NET_EPOCH_ENTER(et);
854 mtx_lock(&carp_mtx);
855 LIST_FOREACH(sc, &carp_list, sc_next)
856 if (sc->sc_state == MASTER) {
857 CARP_LOCK(sc);
858 CURVNET_SET(sc->sc_carpdev->if_vnet);
859 carp_send_ad_locked(sc);
860 CURVNET_RESTORE();
861 CARP_UNLOCK(sc);
862 }
863 mtx_unlock(&carp_mtx);
864 NET_EPOCH_EXIT(et);
865 }
866
867 /* Send a periodic advertisement, executed in callout context. */
868 static void
carp_send_ad(void * v)869 carp_send_ad(void *v)
870 {
871 struct carp_softc *sc = v;
872 struct epoch_tracker et;
873
874 NET_EPOCH_ENTER(et);
875 CARP_LOCK_ASSERT(sc);
876 CURVNET_SET(sc->sc_carpdev->if_vnet);
877 carp_send_ad_locked(sc);
878 CURVNET_RESTORE();
879 CARP_UNLOCK(sc);
880 NET_EPOCH_EXIT(et);
881 }
882
883 static void
carp_send_ad_error(struct carp_softc * sc,int error)884 carp_send_ad_error(struct carp_softc *sc, int error)
885 {
886
887 /*
888 * We track errors and successful sends with this logic:
889 * - Any error resets success counter to 0.
890 * - MAX_ERRORS triggers demotion.
891 * - MIN_SUCCESS successes resets error counter to 0.
892 * - MIN_SUCCESS reverts demotion, if it was triggered before.
893 */
894 if (error) {
895 if (sc->sc_sendad_errors < INT_MAX)
896 sc->sc_sendad_errors++;
897 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
898 static const char fmt[] = "send error %d on %s";
899 char msg[sizeof(fmt) + IFNAMSIZ];
900
901 sprintf(msg, fmt, error, if_name(sc->sc_carpdev));
902 carp_demote_adj(V_carp_senderr_adj, msg);
903 }
904 sc->sc_sendad_success = 0;
905 } else if (sc->sc_sendad_errors > 0) {
906 if (++sc->sc_sendad_success >= CARP_SENDAD_MIN_SUCCESS) {
907 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
908 static const char fmt[] = "send ok on %s";
909 char msg[sizeof(fmt) + IFNAMSIZ];
910
911 sprintf(msg, fmt, if_name(sc->sc_carpdev));
912 carp_demote_adj(-V_carp_senderr_adj, msg);
913 }
914 sc->sc_sendad_errors = 0;
915 }
916 }
917 }
918
919 /*
920 * Pick the best ifaddr on the given ifp for sending CARP
921 * advertisements.
922 *
923 * "Best" here is defined by ifa_preferred(). This function is much
924 * much like ifaof_ifpforaddr() except that we just use ifa_preferred().
925 *
926 * (This could be simplified to return the actual address, except that
927 * it has a different format in AF_INET and AF_INET6.)
928 */
929 static struct ifaddr *
carp_best_ifa(int af,struct ifnet * ifp)930 carp_best_ifa(int af, struct ifnet *ifp)
931 {
932 struct ifaddr *ifa, *best;
933
934 NET_EPOCH_ASSERT();
935
936 if (af >= AF_MAX)
937 return (NULL);
938 best = NULL;
939 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
940 if (ifa->ifa_addr->sa_family == af &&
941 (best == NULL || ifa_preferred(best, ifa)))
942 best = ifa;
943 }
944 if (best != NULL)
945 ifa_ref(best);
946 return (best);
947 }
948
949 static void
carp_send_ad_locked(struct carp_softc * sc)950 carp_send_ad_locked(struct carp_softc *sc)
951 {
952 struct carp_header ch;
953 struct timeval tv;
954 struct ifaddr *ifa;
955 struct carp_header *ch_ptr;
956 struct mbuf *m;
957 int len, advskew;
958
959 NET_EPOCH_ASSERT();
960 CARP_LOCK_ASSERT(sc);
961
962 advskew = DEMOTE_ADVSKEW(sc);
963 tv.tv_sec = sc->sc_advbase;
964 tv.tv_usec = advskew * 1000000 / 256;
965
966 ch.carp_version = CARP_VERSION;
967 ch.carp_type = CARP_ADVERTISEMENT;
968 ch.carp_vhid = sc->sc_vhid;
969 ch.carp_advbase = sc->sc_advbase;
970 ch.carp_advskew = advskew;
971 ch.carp_authlen = 7; /* XXX DEFINE */
972 ch.carp_pad1 = 0; /* must be zero */
973 ch.carp_cksum = 0;
974
975 /* XXXGL: OpenBSD picks first ifaddr with needed family. */
976
977 #ifdef INET
978 if (sc->sc_naddrs) {
979 struct ip *ip;
980
981 m = m_gethdr(M_NOWAIT, MT_DATA);
982 if (m == NULL) {
983 CARPSTATS_INC(carps_onomem);
984 goto resched;
985 }
986 len = sizeof(*ip) + sizeof(ch);
987 m->m_pkthdr.len = len;
988 m->m_pkthdr.rcvif = NULL;
989 m->m_len = len;
990 M_ALIGN(m, m->m_len);
991 if (IN_MULTICAST(sc->sc_carpaddr.s_addr))
992 m->m_flags |= M_MCAST;
993 ip = mtod(m, struct ip *);
994 ip->ip_v = IPVERSION;
995 ip->ip_hl = sizeof(*ip) >> 2;
996 ip->ip_tos = V_carp_dscp << IPTOS_DSCP_OFFSET;
997 ip->ip_len = htons(len);
998 ip->ip_off = htons(IP_DF);
999 ip->ip_ttl = CARP_DFLTTL;
1000 ip->ip_p = IPPROTO_CARP;
1001 ip->ip_sum = 0;
1002 ip_fillid(ip);
1003
1004 ifa = carp_best_ifa(AF_INET, sc->sc_carpdev);
1005 if (ifa != NULL) {
1006 ip->ip_src.s_addr =
1007 ifatoia(ifa)->ia_addr.sin_addr.s_addr;
1008 ifa_free(ifa);
1009 } else
1010 ip->ip_src.s_addr = 0;
1011 ip->ip_dst = sc->sc_carpaddr;
1012
1013 ch_ptr = (struct carp_header *)(&ip[1]);
1014 bcopy(&ch, ch_ptr, sizeof(ch));
1015 if (carp_prepare_ad(m, sc, ch_ptr))
1016 goto resched;
1017
1018 m->m_data += sizeof(*ip);
1019 ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip));
1020 m->m_data -= sizeof(*ip);
1021
1022 CARPSTATS_INC(carps_opackets);
1023
1024 carp_send_ad_error(sc, ip_output(m, NULL, NULL, IP_RAWOUTPUT,
1025 &sc->sc_carpdev->if_carp->cif_imo, NULL));
1026 }
1027 #endif /* INET */
1028 #ifdef INET6
1029 if (sc->sc_naddrs6) {
1030 struct ip6_hdr *ip6;
1031
1032 m = m_gethdr(M_NOWAIT, MT_DATA);
1033 if (m == NULL) {
1034 CARPSTATS_INC(carps_onomem);
1035 goto resched;
1036 }
1037 len = sizeof(*ip6) + sizeof(ch);
1038 m->m_pkthdr.len = len;
1039 m->m_pkthdr.rcvif = NULL;
1040 m->m_len = len;
1041 M_ALIGN(m, m->m_len);
1042 ip6 = mtod(m, struct ip6_hdr *);
1043 bzero(ip6, sizeof(*ip6));
1044 ip6->ip6_vfc |= IPV6_VERSION;
1045 /* Traffic class isn't defined in ip6 struct instead
1046 * it gets offset into flowid field */
1047 ip6->ip6_flow |= htonl(V_carp_dscp << (IPV6_FLOWLABEL_LEN +
1048 IPTOS_DSCP_OFFSET));
1049 ip6->ip6_hlim = CARP_DFLTTL;
1050 ip6->ip6_nxt = IPPROTO_CARP;
1051
1052 /* set the source address */
1053 ifa = carp_best_ifa(AF_INET6, sc->sc_carpdev);
1054 if (ifa != NULL) {
1055 bcopy(IFA_IN6(ifa), &ip6->ip6_src,
1056 sizeof(struct in6_addr));
1057 ifa_free(ifa);
1058 } else
1059 /* This should never happen with IPv6. */
1060 bzero(&ip6->ip6_src, sizeof(struct in6_addr));
1061
1062 /* Set the multicast destination. */
1063 memcpy(&ip6->ip6_dst, &sc->sc_carpaddr6, sizeof(ip6->ip6_dst));
1064 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1065 IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
1066 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
1067 m_freem(m);
1068 CARP_DEBUG("%s: in6_setscope failed\n", __func__);
1069 goto resched;
1070 }
1071 }
1072
1073 ch_ptr = (struct carp_header *)(&ip6[1]);
1074 bcopy(&ch, ch_ptr, sizeof(ch));
1075 if (carp_prepare_ad(m, sc, ch_ptr))
1076 goto resched;
1077
1078 m->m_data += sizeof(*ip6);
1079 ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip6));
1080 m->m_data -= sizeof(*ip6);
1081
1082 CARPSTATS_INC(carps_opackets6);
1083
1084 carp_send_ad_error(sc, ip6_output(m, NULL, NULL, 0,
1085 &sc->sc_carpdev->if_carp->cif_im6o, NULL, NULL));
1086 }
1087 #endif /* INET6 */
1088
1089 resched:
1090 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), carp_send_ad, sc);
1091 }
1092
1093 static void
carp_addroute(struct carp_softc * sc)1094 carp_addroute(struct carp_softc *sc)
1095 {
1096 struct ifaddr *ifa;
1097
1098 CARP_FOREACH_IFA(sc, ifa)
1099 carp_ifa_addroute(ifa);
1100 }
1101
1102 static void
carp_ifa_addroute(struct ifaddr * ifa)1103 carp_ifa_addroute(struct ifaddr *ifa)
1104 {
1105
1106 switch (ifa->ifa_addr->sa_family) {
1107 #ifdef INET
1108 case AF_INET:
1109 in_addprefix(ifatoia(ifa));
1110 ifa_add_loopback_route(ifa,
1111 (struct sockaddr *)&ifatoia(ifa)->ia_addr);
1112 break;
1113 #endif
1114 #ifdef INET6
1115 case AF_INET6:
1116 ifa_add_loopback_route(ifa,
1117 (struct sockaddr *)&ifatoia6(ifa)->ia_addr);
1118 nd6_add_ifa_lle(ifatoia6(ifa));
1119 break;
1120 #endif
1121 }
1122 }
1123
1124 static void
carp_delroute(struct carp_softc * sc)1125 carp_delroute(struct carp_softc *sc)
1126 {
1127 struct ifaddr *ifa;
1128
1129 CARP_FOREACH_IFA(sc, ifa)
1130 carp_ifa_delroute(ifa);
1131 }
1132
1133 static void
carp_ifa_delroute(struct ifaddr * ifa)1134 carp_ifa_delroute(struct ifaddr *ifa)
1135 {
1136
1137 switch (ifa->ifa_addr->sa_family) {
1138 #ifdef INET
1139 case AF_INET:
1140 ifa_del_loopback_route(ifa,
1141 (struct sockaddr *)&ifatoia(ifa)->ia_addr);
1142 in_scrubprefix(ifatoia(ifa), LLE_STATIC);
1143 break;
1144 #endif
1145 #ifdef INET6
1146 case AF_INET6:
1147 ifa_del_loopback_route(ifa,
1148 (struct sockaddr *)&ifatoia6(ifa)->ia_addr);
1149 nd6_rem_ifa_lle(ifatoia6(ifa), 1);
1150 break;
1151 #endif
1152 }
1153 }
1154
1155 int
carp_master(struct ifaddr * ifa)1156 carp_master(struct ifaddr *ifa)
1157 {
1158 struct carp_softc *sc = ifa->ifa_carp;
1159
1160 return (sc->sc_state == MASTER);
1161 }
1162
1163 #ifdef INET
1164 /*
1165 * Broadcast a gratuitous ARP request containing
1166 * the virtual router MAC address for each IP address
1167 * associated with the virtual router.
1168 */
1169 static void
carp_send_arp(struct carp_softc * sc)1170 carp_send_arp(struct carp_softc *sc)
1171 {
1172 struct ifaddr *ifa;
1173 struct in_addr addr;
1174
1175 NET_EPOCH_ASSERT();
1176
1177 CARP_FOREACH_IFA(sc, ifa) {
1178 if (ifa->ifa_addr->sa_family != AF_INET)
1179 continue;
1180 addr = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
1181 arp_announce_ifaddr(sc->sc_carpdev, addr, LLADDR(&sc->sc_addr));
1182 }
1183 }
1184
1185 int
carp_iamatch(struct ifaddr * ifa,uint8_t ** enaddr)1186 carp_iamatch(struct ifaddr *ifa, uint8_t **enaddr)
1187 {
1188 struct carp_softc *sc = ifa->ifa_carp;
1189
1190 if (sc->sc_state == MASTER) {
1191 *enaddr = LLADDR(&sc->sc_addr);
1192 return (1);
1193 }
1194
1195 return (0);
1196 }
1197 #endif
1198
1199 #ifdef INET6
1200 static void
carp_send_na(struct carp_softc * sc)1201 carp_send_na(struct carp_softc *sc)
1202 {
1203 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1204 struct ifaddr *ifa;
1205 struct in6_addr *in6;
1206
1207 CARP_FOREACH_IFA(sc, ifa) {
1208 if (ifa->ifa_addr->sa_family != AF_INET6)
1209 continue;
1210
1211 in6 = IFA_IN6(ifa);
1212 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1213 ND_NA_FLAG_OVERRIDE, 1, NULL);
1214 DELAY(1000); /* XXX */
1215 }
1216 }
1217
1218 /*
1219 * Returns ifa in case it's a carp address and it is MASTER, or if the address
1220 * matches and is not a carp address. Returns NULL otherwise.
1221 */
1222 struct ifaddr *
carp_iamatch6(struct ifnet * ifp,struct in6_addr * taddr)1223 carp_iamatch6(struct ifnet *ifp, struct in6_addr *taddr)
1224 {
1225 struct ifaddr *ifa;
1226
1227 NET_EPOCH_ASSERT();
1228
1229 ifa = NULL;
1230 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1231 if (ifa->ifa_addr->sa_family != AF_INET6)
1232 continue;
1233 if (!IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa)))
1234 continue;
1235 if (ifa->ifa_carp && ifa->ifa_carp->sc_state != MASTER)
1236 ifa = NULL;
1237 else
1238 ifa_ref(ifa);
1239 break;
1240 }
1241
1242 return (ifa);
1243 }
1244
1245 char *
carp_macmatch6(struct ifnet * ifp,struct mbuf * m,const struct in6_addr * taddr)1246 carp_macmatch6(struct ifnet *ifp, struct mbuf *m, const struct in6_addr *taddr)
1247 {
1248 struct ifaddr *ifa;
1249
1250 NET_EPOCH_ASSERT();
1251
1252 IFNET_FOREACH_IFA(ifp, ifa)
1253 if (ifa->ifa_addr->sa_family == AF_INET6 &&
1254 IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) {
1255 struct carp_softc *sc = ifa->ifa_carp;
1256 struct m_tag *mtag;
1257
1258 mtag = m_tag_get(PACKET_TAG_CARP,
1259 sizeof(struct carp_softc *), M_NOWAIT);
1260 if (mtag == NULL)
1261 /* Better a bit than nothing. */
1262 return (LLADDR(&sc->sc_addr));
1263
1264 bcopy(&sc, mtag + 1, sizeof(sc));
1265 m_tag_prepend(m, mtag);
1266
1267 return (LLADDR(&sc->sc_addr));
1268 }
1269
1270 return (NULL);
1271 }
1272 #endif /* INET6 */
1273
1274 int
carp_forus(struct ifnet * ifp,u_char * dhost)1275 carp_forus(struct ifnet *ifp, u_char *dhost)
1276 {
1277 struct carp_softc *sc;
1278 uint8_t *ena = dhost;
1279
1280 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
1281 return (0);
1282
1283 CIF_LOCK(ifp->if_carp);
1284 IFNET_FOREACH_CARP(ifp, sc) {
1285 /*
1286 * CARP_LOCK() is not here, since would protect nothing, but
1287 * cause deadlock with if_bridge, calling this under its lock.
1288 */
1289 if (sc->sc_state == MASTER && !bcmp(dhost, LLADDR(&sc->sc_addr),
1290 ETHER_ADDR_LEN)) {
1291 CIF_UNLOCK(ifp->if_carp);
1292 return (1);
1293 }
1294 }
1295 CIF_UNLOCK(ifp->if_carp);
1296
1297 return (0);
1298 }
1299
1300 /* Master down timeout event, executed in callout context. */
1301 static void
carp_master_down(void * v)1302 carp_master_down(void *v)
1303 {
1304 struct carp_softc *sc = v;
1305 struct epoch_tracker et;
1306
1307 NET_EPOCH_ENTER(et);
1308 CARP_LOCK_ASSERT(sc);
1309
1310 CURVNET_SET(sc->sc_carpdev->if_vnet);
1311 if (sc->sc_state == BACKUP) {
1312 carp_master_down_locked(sc, "master timed out");
1313 }
1314 CURVNET_RESTORE();
1315
1316 CARP_UNLOCK(sc);
1317 NET_EPOCH_EXIT(et);
1318 }
1319
1320 static void
carp_master_down_locked(struct carp_softc * sc,const char * reason)1321 carp_master_down_locked(struct carp_softc *sc, const char *reason)
1322 {
1323
1324 NET_EPOCH_ASSERT();
1325 CARP_LOCK_ASSERT(sc);
1326
1327 switch (sc->sc_state) {
1328 case BACKUP:
1329 carp_set_state(sc, MASTER, reason);
1330 carp_send_ad_locked(sc);
1331 #ifdef INET
1332 carp_send_arp(sc);
1333 #endif
1334 #ifdef INET6
1335 carp_send_na(sc);
1336 #endif
1337 carp_setrun(sc, 0);
1338 carp_addroute(sc);
1339 break;
1340 case INIT:
1341 case MASTER:
1342 #ifdef INVARIANTS
1343 panic("carp: VHID %u@%s: master_down event in %s state\n",
1344 sc->sc_vhid,
1345 if_name(sc->sc_carpdev),
1346 sc->sc_state ? "MASTER" : "INIT");
1347 #endif
1348 break;
1349 }
1350 }
1351
1352 /*
1353 * When in backup state, af indicates whether to reset the master down timer
1354 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1355 */
1356 static void
carp_setrun(struct carp_softc * sc,sa_family_t af)1357 carp_setrun(struct carp_softc *sc, sa_family_t af)
1358 {
1359 struct timeval tv;
1360
1361 CARP_LOCK_ASSERT(sc);
1362
1363 if ((sc->sc_carpdev->if_flags & IFF_UP) == 0 ||
1364 sc->sc_carpdev->if_link_state != LINK_STATE_UP ||
1365 (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0) ||
1366 !V_carp_allow)
1367 return;
1368
1369 switch (sc->sc_state) {
1370 case INIT:
1371 carp_set_state(sc, BACKUP, "initialization complete");
1372 carp_setrun(sc, 0);
1373 break;
1374 case BACKUP:
1375 callout_stop(&sc->sc_ad_tmo);
1376 tv.tv_sec = 3 * sc->sc_advbase;
1377 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1378 switch (af) {
1379 #ifdef INET
1380 case AF_INET:
1381 callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
1382 carp_master_down, sc);
1383 break;
1384 #endif
1385 #ifdef INET6
1386 case AF_INET6:
1387 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
1388 carp_master_down, sc);
1389 break;
1390 #endif
1391 default:
1392 #ifdef INET
1393 if (sc->sc_naddrs)
1394 callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
1395 carp_master_down, sc);
1396 #endif
1397 #ifdef INET6
1398 if (sc->sc_naddrs6)
1399 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
1400 carp_master_down, sc);
1401 #endif
1402 break;
1403 }
1404 break;
1405 case MASTER:
1406 tv.tv_sec = sc->sc_advbase;
1407 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1408 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1409 carp_send_ad, sc);
1410 break;
1411 }
1412 }
1413
1414 /*
1415 * Setup multicast structures.
1416 */
1417 static int
carp_multicast_setup(struct carp_if * cif,sa_family_t sa)1418 carp_multicast_setup(struct carp_if *cif, sa_family_t sa)
1419 {
1420 struct ifnet *ifp = cif->cif_ifp;
1421 int error = 0;
1422
1423 switch (sa) {
1424 #ifdef INET
1425 case AF_INET:
1426 {
1427 struct ip_moptions *imo = &cif->cif_imo;
1428 struct in_mfilter *imf;
1429 struct in_addr addr;
1430
1431 if (ip_mfilter_first(&imo->imo_head) != NULL)
1432 return (0);
1433
1434 imf = ip_mfilter_alloc(M_WAITOK, 0, 0);
1435 ip_mfilter_init(&imo->imo_head);
1436 imo->imo_multicast_vif = -1;
1437
1438 addr.s_addr = htonl(INADDR_CARP_GROUP);
1439 if ((error = in_joingroup(ifp, &addr, NULL,
1440 &imf->imf_inm)) != 0) {
1441 ip_mfilter_free(imf);
1442 break;
1443 }
1444
1445 ip_mfilter_insert(&imo->imo_head, imf);
1446 imo->imo_multicast_ifp = ifp;
1447 imo->imo_multicast_ttl = CARP_DFLTTL;
1448 imo->imo_multicast_loop = 0;
1449 break;
1450 }
1451 #endif
1452 #ifdef INET6
1453 case AF_INET6:
1454 {
1455 struct ip6_moptions *im6o = &cif->cif_im6o;
1456 struct in6_mfilter *im6f[2];
1457 struct in6_addr in6;
1458
1459 if (ip6_mfilter_first(&im6o->im6o_head))
1460 return (0);
1461
1462 im6f[0] = ip6_mfilter_alloc(M_WAITOK, 0, 0);
1463 im6f[1] = ip6_mfilter_alloc(M_WAITOK, 0, 0);
1464
1465 ip6_mfilter_init(&im6o->im6o_head);
1466 im6o->im6o_multicast_hlim = CARP_DFLTTL;
1467 im6o->im6o_multicast_ifp = ifp;
1468
1469 /* Join IPv6 CARP multicast group. */
1470 bzero(&in6, sizeof(in6));
1471 in6.s6_addr16[0] = htons(0xff02);
1472 in6.s6_addr8[15] = 0x12;
1473 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) {
1474 ip6_mfilter_free(im6f[0]);
1475 ip6_mfilter_free(im6f[1]);
1476 break;
1477 }
1478 if ((error = in6_joingroup(ifp, &in6, NULL, &im6f[0]->im6f_in6m, 0)) != 0) {
1479 ip6_mfilter_free(im6f[0]);
1480 ip6_mfilter_free(im6f[1]);
1481 break;
1482 }
1483
1484 /* Join solicited multicast address. */
1485 bzero(&in6, sizeof(in6));
1486 in6.s6_addr16[0] = htons(0xff02);
1487 in6.s6_addr32[1] = 0;
1488 in6.s6_addr32[2] = htonl(1);
1489 in6.s6_addr32[3] = 0;
1490 in6.s6_addr8[12] = 0xff;
1491
1492 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) {
1493 ip6_mfilter_free(im6f[0]);
1494 ip6_mfilter_free(im6f[1]);
1495 break;
1496 }
1497
1498 if ((error = in6_joingroup(ifp, &in6, NULL, &im6f[1]->im6f_in6m, 0)) != 0) {
1499 in6_leavegroup(im6f[0]->im6f_in6m, NULL);
1500 ip6_mfilter_free(im6f[0]);
1501 ip6_mfilter_free(im6f[1]);
1502 break;
1503 }
1504 ip6_mfilter_insert(&im6o->im6o_head, im6f[0]);
1505 ip6_mfilter_insert(&im6o->im6o_head, im6f[1]);
1506 break;
1507 }
1508 #endif
1509 }
1510
1511 return (error);
1512 }
1513
1514 /*
1515 * Free multicast structures.
1516 */
1517 static void
carp_multicast_cleanup(struct carp_if * cif,sa_family_t sa)1518 carp_multicast_cleanup(struct carp_if *cif, sa_family_t sa)
1519 {
1520 #ifdef INET
1521 struct ip_moptions *imo = &cif->cif_imo;
1522 struct in_mfilter *imf;
1523 #endif
1524 #ifdef INET6
1525 struct ip6_moptions *im6o = &cif->cif_im6o;
1526 struct in6_mfilter *im6f;
1527 #endif
1528 sx_assert(&carp_sx, SA_XLOCKED);
1529
1530 switch (sa) {
1531 #ifdef INET
1532 case AF_INET:
1533 if (cif->cif_naddrs != 0)
1534 break;
1535
1536 while ((imf = ip_mfilter_first(&imo->imo_head)) != NULL) {
1537 ip_mfilter_remove(&imo->imo_head, imf);
1538 in_leavegroup(imf->imf_inm, NULL);
1539 ip_mfilter_free(imf);
1540 }
1541 break;
1542 #endif
1543 #ifdef INET6
1544 case AF_INET6:
1545 if (cif->cif_naddrs6 != 0)
1546 break;
1547
1548 while ((im6f = ip6_mfilter_first(&im6o->im6o_head)) != NULL) {
1549 ip6_mfilter_remove(&im6o->im6o_head, im6f);
1550 in6_leavegroup(im6f->im6f_in6m, NULL);
1551 ip6_mfilter_free(im6f);
1552 }
1553 break;
1554 #endif
1555 }
1556 }
1557
1558 int
carp_output(struct ifnet * ifp,struct mbuf * m,const struct sockaddr * sa)1559 carp_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa)
1560 {
1561 struct m_tag *mtag;
1562 struct carp_softc *sc;
1563
1564 if (!sa)
1565 return (0);
1566
1567 switch (sa->sa_family) {
1568 #ifdef INET
1569 case AF_INET:
1570 break;
1571 #endif
1572 #ifdef INET6
1573 case AF_INET6:
1574 break;
1575 #endif
1576 default:
1577 return (0);
1578 }
1579
1580 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL);
1581 if (mtag == NULL)
1582 return (0);
1583
1584 bcopy(mtag + 1, &sc, sizeof(sc));
1585
1586 switch (sa->sa_family) {
1587 case AF_INET:
1588 if (! IN_MULTICAST(ntohl(sc->sc_carpaddr.s_addr)))
1589 return (0);
1590 break;
1591 case AF_INET6:
1592 if (! IN6_IS_ADDR_MULTICAST(&sc->sc_carpaddr6))
1593 return (0);
1594 break;
1595 default:
1596 panic("Unknown af");
1597 }
1598
1599 /* Set the source MAC address to the Virtual Router MAC Address. */
1600 switch (ifp->if_type) {
1601 case IFT_ETHER:
1602 case IFT_BRIDGE:
1603 case IFT_L2VLAN: {
1604 struct ether_header *eh;
1605
1606 eh = mtod(m, struct ether_header *);
1607 eh->ether_shost[0] = 0;
1608 eh->ether_shost[1] = 0;
1609 eh->ether_shost[2] = 0x5e;
1610 eh->ether_shost[3] = 0;
1611 eh->ether_shost[4] = 1;
1612 eh->ether_shost[5] = sc->sc_vhid;
1613 }
1614 break;
1615 default:
1616 printf("%s: carp is not supported for the %d interface type\n",
1617 if_name(ifp), ifp->if_type);
1618 return (EOPNOTSUPP);
1619 }
1620
1621 return (0);
1622 }
1623
1624 static struct carp_softc*
carp_alloc(struct ifnet * ifp)1625 carp_alloc(struct ifnet *ifp)
1626 {
1627 struct carp_softc *sc;
1628 struct carp_if *cif;
1629
1630 sx_assert(&carp_sx, SA_XLOCKED);
1631
1632 if ((cif = ifp->if_carp) == NULL)
1633 cif = carp_alloc_if(ifp);
1634
1635 sc = malloc(sizeof(*sc), M_CARP, M_WAITOK|M_ZERO);
1636
1637 sc->sc_advbase = CARP_DFLTINTV;
1638 sc->sc_vhid = -1; /* required setting */
1639 sc->sc_init_counter = 1;
1640 sc->sc_state = INIT;
1641
1642 sc->sc_ifasiz = sizeof(struct ifaddr *);
1643 sc->sc_ifas = malloc(sc->sc_ifasiz, M_CARP, M_WAITOK|M_ZERO);
1644 sc->sc_carpdev = ifp;
1645
1646 sc->sc_carpaddr.s_addr = htonl(INADDR_CARP_GROUP);
1647 sc->sc_carpaddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
1648 sc->sc_carpaddr6.s6_addr8[15] = 0x12;
1649
1650 CARP_LOCK_INIT(sc);
1651 #ifdef INET
1652 callout_init_mtx(&sc->sc_md_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED);
1653 #endif
1654 #ifdef INET6
1655 callout_init_mtx(&sc->sc_md6_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED);
1656 #endif
1657 callout_init_mtx(&sc->sc_ad_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED);
1658
1659 CIF_LOCK(cif);
1660 TAILQ_INSERT_TAIL(&cif->cif_vrs, sc, sc_list);
1661 CIF_UNLOCK(cif);
1662
1663 mtx_lock(&carp_mtx);
1664 LIST_INSERT_HEAD(&carp_list, sc, sc_next);
1665 mtx_unlock(&carp_mtx);
1666
1667 return (sc);
1668 }
1669
1670 static void
carp_grow_ifas(struct carp_softc * sc)1671 carp_grow_ifas(struct carp_softc *sc)
1672 {
1673 struct ifaddr **new;
1674
1675 new = malloc(sc->sc_ifasiz * 2, M_CARP, M_WAITOK | M_ZERO);
1676 CARP_LOCK(sc);
1677 bcopy(sc->sc_ifas, new, sc->sc_ifasiz);
1678 free(sc->sc_ifas, M_CARP);
1679 sc->sc_ifas = new;
1680 sc->sc_ifasiz *= 2;
1681 CARP_UNLOCK(sc);
1682 }
1683
1684 static void
carp_destroy(struct carp_softc * sc)1685 carp_destroy(struct carp_softc *sc)
1686 {
1687 struct ifnet *ifp = sc->sc_carpdev;
1688 struct carp_if *cif = ifp->if_carp;
1689
1690 sx_assert(&carp_sx, SA_XLOCKED);
1691
1692 if (sc->sc_suppress)
1693 carp_demote_adj(-V_carp_ifdown_adj, "vhid removed");
1694 CARP_UNLOCK(sc);
1695
1696 CIF_LOCK(cif);
1697 TAILQ_REMOVE(&cif->cif_vrs, sc, sc_list);
1698 CIF_UNLOCK(cif);
1699
1700 mtx_lock(&carp_mtx);
1701 LIST_REMOVE(sc, sc_next);
1702 mtx_unlock(&carp_mtx);
1703
1704 callout_drain(&sc->sc_ad_tmo);
1705 #ifdef INET
1706 callout_drain(&sc->sc_md_tmo);
1707 #endif
1708 #ifdef INET6
1709 callout_drain(&sc->sc_md6_tmo);
1710 #endif
1711 CARP_LOCK_DESTROY(sc);
1712
1713 free(sc->sc_ifas, M_CARP);
1714 free(sc, M_CARP);
1715 }
1716
1717 static struct carp_if*
carp_alloc_if(struct ifnet * ifp)1718 carp_alloc_if(struct ifnet *ifp)
1719 {
1720 struct carp_if *cif;
1721 int error;
1722
1723 cif = malloc(sizeof(*cif), M_CARP, M_WAITOK|M_ZERO);
1724
1725 if ((error = ifpromisc(ifp, 1)) != 0)
1726 printf("%s: ifpromisc(%s) failed: %d\n",
1727 __func__, if_name(ifp), error);
1728 else
1729 cif->cif_flags |= CIF_PROMISC;
1730
1731 CIF_LOCK_INIT(cif);
1732 cif->cif_ifp = ifp;
1733 TAILQ_INIT(&cif->cif_vrs);
1734
1735 IF_ADDR_WLOCK(ifp);
1736 ifp->if_carp = cif;
1737 if_ref(ifp);
1738 IF_ADDR_WUNLOCK(ifp);
1739
1740 return (cif);
1741 }
1742
1743 static void
carp_free_if(struct carp_if * cif)1744 carp_free_if(struct carp_if *cif)
1745 {
1746 struct ifnet *ifp = cif->cif_ifp;
1747
1748 CIF_LOCK_ASSERT(cif);
1749 KASSERT(TAILQ_EMPTY(&cif->cif_vrs), ("%s: softc list not empty",
1750 __func__));
1751
1752 IF_ADDR_WLOCK(ifp);
1753 ifp->if_carp = NULL;
1754 IF_ADDR_WUNLOCK(ifp);
1755
1756 CIF_LOCK_DESTROY(cif);
1757
1758 if (cif->cif_flags & CIF_PROMISC)
1759 ifpromisc(ifp, 0);
1760 if_rele(ifp);
1761
1762 free(cif, M_CARP);
1763 }
1764
1765 static bool
carp_carprcp(void * arg,struct carp_softc * sc,int priv)1766 carp_carprcp(void *arg, struct carp_softc *sc, int priv)
1767 {
1768 struct carpreq *carpr = arg;
1769
1770 CARP_LOCK(sc);
1771 carpr->carpr_state = sc->sc_state;
1772 carpr->carpr_vhid = sc->sc_vhid;
1773 carpr->carpr_advbase = sc->sc_advbase;
1774 carpr->carpr_advskew = sc->sc_advskew;
1775 if (priv)
1776 bcopy(sc->sc_key, carpr->carpr_key, sizeof(carpr->carpr_key));
1777 else
1778 bzero(carpr->carpr_key, sizeof(carpr->carpr_key));
1779 CARP_UNLOCK(sc);
1780
1781 return (true);
1782 }
1783
1784 static int
carp_ioctl_set(if_t ifp,struct carpkreq * carpr)1785 carp_ioctl_set(if_t ifp, struct carpkreq *carpr)
1786 {
1787 struct epoch_tracker et;
1788 struct carp_softc *sc = NULL;
1789 int error = 0;
1790
1791
1792 if (carpr->carpr_vhid <= 0 || carpr->carpr_vhid > CARP_MAXVHID ||
1793 carpr->carpr_advbase < 0 || carpr->carpr_advskew < 0) {
1794 return (EINVAL);
1795 }
1796
1797 if (ifp->if_carp) {
1798 IFNET_FOREACH_CARP(ifp, sc)
1799 if (sc->sc_vhid == carpr->carpr_vhid)
1800 break;
1801 }
1802 if (sc == NULL) {
1803 sc = carp_alloc(ifp);
1804 CARP_LOCK(sc);
1805 sc->sc_vhid = carpr->carpr_vhid;
1806 LLADDR(&sc->sc_addr)[0] = 0;
1807 LLADDR(&sc->sc_addr)[1] = 0;
1808 LLADDR(&sc->sc_addr)[2] = 0x5e;
1809 LLADDR(&sc->sc_addr)[3] = 0;
1810 LLADDR(&sc->sc_addr)[4] = 1;
1811 LLADDR(&sc->sc_addr)[5] = sc->sc_vhid;
1812 } else
1813 CARP_LOCK(sc);
1814 if (carpr->carpr_advbase > 0) {
1815 if (carpr->carpr_advbase > 255 ||
1816 carpr->carpr_advbase < CARP_DFLTINTV) {
1817 error = EINVAL;
1818 goto out;
1819 }
1820 sc->sc_advbase = carpr->carpr_advbase;
1821 }
1822 if (carpr->carpr_advskew >= 255) {
1823 error = EINVAL;
1824 goto out;
1825 }
1826 sc->sc_advskew = carpr->carpr_advskew;
1827 if (carpr->carpr_addr.s_addr != INADDR_ANY)
1828 sc->sc_carpaddr = carpr->carpr_addr;
1829 if (! IN6_IS_ADDR_UNSPECIFIED(&carpr->carpr_addr6)) {
1830 memcpy(&sc->sc_carpaddr6, &carpr->carpr_addr6,
1831 sizeof(sc->sc_carpaddr6));
1832 }
1833 if (carpr->carpr_key[0] != '\0') {
1834 bcopy(carpr->carpr_key, sc->sc_key, sizeof(sc->sc_key));
1835 carp_hmac_prepare(sc);
1836 }
1837 if (sc->sc_state != INIT &&
1838 carpr->carpr_state != sc->sc_state) {
1839 switch (carpr->carpr_state) {
1840 case BACKUP:
1841 callout_stop(&sc->sc_ad_tmo);
1842 carp_set_state(sc, BACKUP,
1843 "user requested via ifconfig");
1844 carp_setrun(sc, 0);
1845 carp_delroute(sc);
1846 break;
1847 case MASTER:
1848 NET_EPOCH_ENTER(et);
1849 carp_master_down_locked(sc,
1850 "user requested via ifconfig");
1851 NET_EPOCH_EXIT(et);
1852 break;
1853 default:
1854 break;
1855 }
1856 }
1857
1858 out:
1859 CARP_UNLOCK(sc);
1860
1861 return (error);
1862 }
1863
1864 static int
carp_ioctl_get(if_t ifp,struct ucred * cred,struct carpreq * carpr,bool (* outfn)(void *,struct carp_softc *,int),void * arg)1865 carp_ioctl_get(if_t ifp, struct ucred *cred, struct carpreq *carpr,
1866 bool (*outfn)(void *, struct carp_softc *, int), void *arg)
1867 {
1868 int priveleged;
1869 struct carp_softc *sc;
1870
1871 if (carpr->carpr_vhid < 0 || carpr->carpr_vhid > CARP_MAXVHID)
1872 return (EINVAL);
1873 if (carpr->carpr_count < 1)
1874 return (EMSGSIZE);
1875 if (ifp->if_carp == NULL)
1876 return (ENOENT);
1877
1878 priveleged = (priv_check_cred(cred, PRIV_NETINET_CARP) == 0);
1879 if (carpr->carpr_vhid != 0) {
1880 IFNET_FOREACH_CARP(ifp, sc)
1881 if (sc->sc_vhid == carpr->carpr_vhid)
1882 break;
1883 if (sc == NULL)
1884 return (ENOENT);
1885
1886 if (! outfn(arg, sc, priveleged))
1887 return (ENOMEM);
1888 carpr->carpr_count = 1;
1889 } else {
1890 int count;
1891
1892 count = 0;
1893 IFNET_FOREACH_CARP(ifp, sc)
1894 count++;
1895
1896 if (count > carpr->carpr_count)
1897 return (EMSGSIZE);
1898
1899 IFNET_FOREACH_CARP(ifp, sc) {
1900 if (! outfn(arg, sc, priveleged))
1901 return (ENOMEM);
1902 carpr->carpr_count = count;
1903 }
1904 }
1905
1906 return (0);
1907 }
1908
1909 int
carp_ioctl(struct ifreq * ifr,u_long cmd,struct thread * td)1910 carp_ioctl(struct ifreq *ifr, u_long cmd, struct thread *td)
1911 {
1912 struct carpreq carpr;
1913 struct carpkreq carprk = { };
1914 struct ifnet *ifp;
1915 int error = 0;
1916
1917 if ((error = copyin(ifr_data_get_ptr(ifr), &carpr, sizeof carpr)))
1918 return (error);
1919
1920 ifp = ifunit_ref(ifr->ifr_name);
1921 if ((error = carp_is_supported_if(ifp)) != 0)
1922 goto out;
1923
1924 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
1925 error = EADDRNOTAVAIL;
1926 goto out;
1927 }
1928
1929 sx_xlock(&carp_sx);
1930 switch (cmd) {
1931 case SIOCSVH:
1932 if ((error = priv_check(td, PRIV_NETINET_CARP)))
1933 break;
1934
1935 memcpy(&carprk, &carpr, sizeof(carpr));
1936 error = carp_ioctl_set(ifp, &carprk);
1937 break;
1938
1939 case SIOCGVH:
1940 error = carp_ioctl_get(ifp, td->td_ucred, &carpr,
1941 carp_carprcp, &carpr);
1942 if (error == 0) {
1943 error = copyout(&carpr,
1944 (char *)ifr_data_get_ptr(ifr),
1945 carpr.carpr_count * sizeof(carpr));
1946 }
1947 break;
1948 default:
1949 error = EINVAL;
1950 }
1951 sx_xunlock(&carp_sx);
1952
1953 out:
1954 if (ifp != NULL)
1955 if_rele(ifp);
1956
1957 return (error);
1958 }
1959
1960 static int
carp_get_vhid(struct ifaddr * ifa)1961 carp_get_vhid(struct ifaddr *ifa)
1962 {
1963
1964 if (ifa == NULL || ifa->ifa_carp == NULL)
1965 return (0);
1966
1967 return (ifa->ifa_carp->sc_vhid);
1968 }
1969
1970 int
carp_attach(struct ifaddr * ifa,int vhid)1971 carp_attach(struct ifaddr *ifa, int vhid)
1972 {
1973 struct ifnet *ifp = ifa->ifa_ifp;
1974 struct carp_if *cif = ifp->if_carp;
1975 struct carp_softc *sc;
1976 int index, error;
1977
1978 KASSERT(ifa->ifa_carp == NULL, ("%s: ifa %p attached", __func__, ifa));
1979
1980 switch (ifa->ifa_addr->sa_family) {
1981 #ifdef INET
1982 case AF_INET:
1983 #endif
1984 #ifdef INET6
1985 case AF_INET6:
1986 #endif
1987 break;
1988 default:
1989 return (EPROTOTYPE);
1990 }
1991
1992 sx_xlock(&carp_sx);
1993 if (ifp->if_carp == NULL) {
1994 sx_xunlock(&carp_sx);
1995 return (ENOPROTOOPT);
1996 }
1997
1998 IFNET_FOREACH_CARP(ifp, sc)
1999 if (sc->sc_vhid == vhid)
2000 break;
2001 if (sc == NULL) {
2002 sx_xunlock(&carp_sx);
2003 return (ENOENT);
2004 }
2005
2006 error = carp_multicast_setup(cif, ifa->ifa_addr->sa_family);
2007 if (error) {
2008 CIF_FREE(cif);
2009 sx_xunlock(&carp_sx);
2010 return (error);
2011 }
2012
2013 index = sc->sc_naddrs + sc->sc_naddrs6 + 1;
2014 if (index > sc->sc_ifasiz / sizeof(struct ifaddr *))
2015 carp_grow_ifas(sc);
2016
2017 switch (ifa->ifa_addr->sa_family) {
2018 #ifdef INET
2019 case AF_INET:
2020 cif->cif_naddrs++;
2021 sc->sc_naddrs++;
2022 break;
2023 #endif
2024 #ifdef INET6
2025 case AF_INET6:
2026 cif->cif_naddrs6++;
2027 sc->sc_naddrs6++;
2028 break;
2029 #endif
2030 }
2031
2032 ifa_ref(ifa);
2033
2034 CARP_LOCK(sc);
2035 sc->sc_ifas[index - 1] = ifa;
2036 ifa->ifa_carp = sc;
2037 carp_hmac_prepare(sc);
2038 carp_sc_state(sc);
2039 CARP_UNLOCK(sc);
2040
2041 sx_xunlock(&carp_sx);
2042
2043 return (0);
2044 }
2045
2046 void
carp_detach(struct ifaddr * ifa,bool keep_cif)2047 carp_detach(struct ifaddr *ifa, bool keep_cif)
2048 {
2049 struct ifnet *ifp = ifa->ifa_ifp;
2050 struct carp_if *cif = ifp->if_carp;
2051 struct carp_softc *sc = ifa->ifa_carp;
2052 int i, index;
2053
2054 KASSERT(sc != NULL, ("%s: %p not attached", __func__, ifa));
2055
2056 sx_xlock(&carp_sx);
2057
2058 CARP_LOCK(sc);
2059 /* Shift array. */
2060 index = sc->sc_naddrs + sc->sc_naddrs6;
2061 for (i = 0; i < index; i++)
2062 if (sc->sc_ifas[i] == ifa)
2063 break;
2064 KASSERT(i < index, ("%s: %p no backref", __func__, ifa));
2065 for (; i < index - 1; i++)
2066 sc->sc_ifas[i] = sc->sc_ifas[i+1];
2067 sc->sc_ifas[index - 1] = NULL;
2068
2069 switch (ifa->ifa_addr->sa_family) {
2070 #ifdef INET
2071 case AF_INET:
2072 cif->cif_naddrs--;
2073 sc->sc_naddrs--;
2074 break;
2075 #endif
2076 #ifdef INET6
2077 case AF_INET6:
2078 cif->cif_naddrs6--;
2079 sc->sc_naddrs6--;
2080 break;
2081 #endif
2082 }
2083
2084 carp_ifa_delroute(ifa);
2085 carp_multicast_cleanup(cif, ifa->ifa_addr->sa_family);
2086
2087 ifa->ifa_carp = NULL;
2088 ifa_free(ifa);
2089
2090 carp_hmac_prepare(sc);
2091 carp_sc_state(sc);
2092
2093 if (!keep_cif && sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0)
2094 carp_destroy(sc);
2095 else
2096 CARP_UNLOCK(sc);
2097
2098 if (!keep_cif)
2099 CIF_FREE(cif);
2100
2101 sx_xunlock(&carp_sx);
2102 }
2103
2104 static void
carp_set_state(struct carp_softc * sc,int state,const char * reason)2105 carp_set_state(struct carp_softc *sc, int state, const char *reason)
2106 {
2107
2108 CARP_LOCK_ASSERT(sc);
2109
2110 if (sc->sc_state != state) {
2111 const char *carp_states[] = { CARP_STATES };
2112 char subsys[IFNAMSIZ+5];
2113
2114 snprintf(subsys, IFNAMSIZ+5, "%u@%s", sc->sc_vhid,
2115 if_name(sc->sc_carpdev));
2116
2117 CARP_LOG("%s: %s -> %s (%s)\n", subsys,
2118 carp_states[sc->sc_state], carp_states[state], reason);
2119
2120 sc->sc_state = state;
2121
2122 devctl_notify("CARP", subsys, carp_states[state], NULL);
2123 }
2124 }
2125
2126 static void
carp_linkstate(struct ifnet * ifp)2127 carp_linkstate(struct ifnet *ifp)
2128 {
2129 struct carp_softc *sc;
2130
2131 CIF_LOCK(ifp->if_carp);
2132 IFNET_FOREACH_CARP(ifp, sc) {
2133 CARP_LOCK(sc);
2134 carp_sc_state(sc);
2135 CARP_UNLOCK(sc);
2136 }
2137 CIF_UNLOCK(ifp->if_carp);
2138 }
2139
2140 static void
carp_sc_state(struct carp_softc * sc)2141 carp_sc_state(struct carp_softc *sc)
2142 {
2143
2144 CARP_LOCK_ASSERT(sc);
2145
2146 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP ||
2147 !(sc->sc_carpdev->if_flags & IFF_UP) ||
2148 !V_carp_allow) {
2149 callout_stop(&sc->sc_ad_tmo);
2150 #ifdef INET
2151 callout_stop(&sc->sc_md_tmo);
2152 #endif
2153 #ifdef INET6
2154 callout_stop(&sc->sc_md6_tmo);
2155 #endif
2156 carp_set_state(sc, INIT, "hardware interface down");
2157 carp_setrun(sc, 0);
2158 carp_delroute(sc);
2159 if (!sc->sc_suppress)
2160 carp_demote_adj(V_carp_ifdown_adj, "interface down");
2161 sc->sc_suppress = 1;
2162 } else {
2163 carp_set_state(sc, INIT, "hardware interface up");
2164 carp_setrun(sc, 0);
2165 if (sc->sc_suppress)
2166 carp_demote_adj(-V_carp_ifdown_adj, "interface up");
2167 sc->sc_suppress = 0;
2168 }
2169 }
2170
2171 static void
carp_demote_adj(int adj,char * reason)2172 carp_demote_adj(int adj, char *reason)
2173 {
2174 atomic_add_int(&V_carp_demotion, adj);
2175 CARP_LOG("demoted by %d to %d (%s)\n", adj, V_carp_demotion, reason);
2176 taskqueue_enqueue(taskqueue_swi, &carp_sendall_task);
2177 }
2178
2179 static int
carp_allow_sysctl(SYSCTL_HANDLER_ARGS)2180 carp_allow_sysctl(SYSCTL_HANDLER_ARGS)
2181 {
2182 int new, error;
2183 struct carp_softc *sc;
2184
2185 new = V_carp_allow;
2186 error = sysctl_handle_int(oidp, &new, 0, req);
2187 if (error || !req->newptr)
2188 return (error);
2189
2190 if (V_carp_allow != new) {
2191 V_carp_allow = new;
2192
2193 mtx_lock(&carp_mtx);
2194 LIST_FOREACH(sc, &carp_list, sc_next) {
2195 CARP_LOCK(sc);
2196 if (curvnet == sc->sc_carpdev->if_vnet)
2197 carp_sc_state(sc);
2198 CARP_UNLOCK(sc);
2199 }
2200 mtx_unlock(&carp_mtx);
2201 }
2202
2203 return (0);
2204 }
2205
2206 static int
carp_dscp_sysctl(SYSCTL_HANDLER_ARGS)2207 carp_dscp_sysctl(SYSCTL_HANDLER_ARGS)
2208 {
2209 int new, error;
2210
2211 new = V_carp_dscp;
2212 error = sysctl_handle_int(oidp, &new, 0, req);
2213 if (error || !req->newptr)
2214 return (error);
2215
2216 if (new < 0 || new > 63)
2217 return (EINVAL);
2218
2219 V_carp_dscp = new;
2220
2221 return (0);
2222 }
2223
2224 static int
carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS)2225 carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS)
2226 {
2227 int new, error;
2228
2229 new = V_carp_demotion;
2230 error = sysctl_handle_int(oidp, &new, 0, req);
2231 if (error || !req->newptr)
2232 return (error);
2233
2234 carp_demote_adj(new, "sysctl");
2235
2236 return (0);
2237 }
2238
2239 static int
nlattr_get_carp_key(struct nlattr * nla,struct nl_pstate * npt,const void * arg,void * target)2240 nlattr_get_carp_key(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
2241 {
2242 if (__predict_false(NLA_DATA_LEN(nla) > CARP_KEY_LEN))
2243 return (EINVAL);
2244
2245 memcpy(target, NLA_DATA_CONST(nla), NLA_DATA_LEN(nla));
2246 return (0);
2247 }
2248
2249 struct carp_nl_send_args {
2250 struct nlmsghdr *hdr;
2251 struct nl_pstate *npt;
2252 };
2253
2254 static bool
carp_nl_send(void * arg,struct carp_softc * sc,int priv)2255 carp_nl_send(void *arg, struct carp_softc *sc, int priv)
2256 {
2257 struct carp_nl_send_args *nlsa = arg;
2258 struct nlmsghdr *hdr = nlsa->hdr;
2259 struct nl_pstate *npt = nlsa->npt;
2260 struct nl_writer *nw = npt->nw;
2261 struct genlmsghdr *ghdr_new;
2262
2263 if (!nlmsg_reply(nw, hdr, sizeof(struct genlmsghdr))) {
2264 nlmsg_abort(nw);
2265 return (false);
2266 }
2267
2268 ghdr_new = nlmsg_reserve_object(nw, struct genlmsghdr);
2269 if (ghdr_new == NULL) {
2270 nlmsg_abort(nw);
2271 return (false);
2272 }
2273
2274 ghdr_new->cmd = CARP_NL_CMD_GET;
2275 ghdr_new->version = 0;
2276 ghdr_new->reserved = 0;
2277
2278 CARP_LOCK(sc);
2279
2280 nlattr_add_u32(nw, CARP_NL_VHID, sc->sc_vhid);
2281 nlattr_add_u32(nw, CARP_NL_STATE, sc->sc_state);
2282 nlattr_add_s32(nw, CARP_NL_ADVBASE, sc->sc_advbase);
2283 nlattr_add_s32(nw, CARP_NL_ADVSKEW, sc->sc_advskew);
2284 nlattr_add_in_addr(nw, CARP_NL_ADDR, &sc->sc_carpaddr);
2285 nlattr_add_in6_addr(nw, CARP_NL_ADDR6, &sc->sc_carpaddr6);
2286
2287 if (priv)
2288 nlattr_add(nw, CARP_NL_KEY, sizeof(sc->sc_key), sc->sc_key);
2289
2290 CARP_UNLOCK(sc);
2291
2292 if (! nlmsg_end(nw)) {
2293 nlmsg_abort(nw);
2294 return (false);
2295 }
2296
2297 return (true);
2298 }
2299
2300 struct nl_carp_parsed {
2301 unsigned int ifindex;
2302 char *ifname;
2303 uint32_t state;
2304 uint32_t vhid;
2305 int32_t advbase;
2306 int32_t advskew;
2307 char key[CARP_KEY_LEN];
2308 struct in_addr addr;
2309 struct in6_addr addr6;
2310 };
2311
2312 #define _IN(_field) offsetof(struct genlmsghdr, _field)
2313 #define _OUT(_field) offsetof(struct nl_carp_parsed, _field)
2314
2315 static const struct nlattr_parser nla_p_set[] = {
2316 { .type = CARP_NL_VHID, .off = _OUT(vhid), .cb = nlattr_get_uint32 },
2317 { .type = CARP_NL_STATE, .off = _OUT(state), .cb = nlattr_get_uint32 },
2318 { .type = CARP_NL_ADVBASE, .off = _OUT(advbase), .cb = nlattr_get_uint32 },
2319 { .type = CARP_NL_ADVSKEW, .off = _OUT(advskew), .cb = nlattr_get_uint32 },
2320 { .type = CARP_NL_KEY, .off = _OUT(key), .cb = nlattr_get_carp_key },
2321 { .type = CARP_NL_IFINDEX, .off = _OUT(ifindex), .cb = nlattr_get_uint32 },
2322 { .type = CARP_NL_ADDR, .off = _OUT(addr), .cb = nlattr_get_in_addr },
2323 { .type = CARP_NL_ADDR6, .off = _OUT(addr6), .cb = nlattr_get_in6_addr },
2324 { .type = CARP_NL_IFNAME, .off = _OUT(ifname), .cb = nlattr_get_string },
2325 };
2326 static const struct nlfield_parser nlf_p_set[] = {
2327 };
2328 NL_DECLARE_PARSER(carp_parser, struct genlmsghdr, nlf_p_set, nla_p_set);
2329 #undef _IN
2330 #undef _OUT
2331
2332
2333 static int
carp_nl_get(struct nlmsghdr * hdr,struct nl_pstate * npt)2334 carp_nl_get(struct nlmsghdr *hdr, struct nl_pstate *npt)
2335 {
2336 struct nl_carp_parsed attrs = { };
2337 struct carp_nl_send_args args;
2338 struct carpreq carpr = { };
2339 struct epoch_tracker et;
2340 if_t ifp = NULL;
2341 int error;
2342
2343 error = nl_parse_nlmsg(hdr, &carp_parser, npt, &attrs);
2344 if (error != 0)
2345 return (error);
2346
2347 NET_EPOCH_ENTER(et);
2348 if (attrs.ifname != NULL)
2349 ifp = ifunit_ref(attrs.ifname);
2350 else if (attrs.ifindex != 0)
2351 ifp = ifnet_byindex_ref(attrs.ifindex);
2352 NET_EPOCH_EXIT(et);
2353
2354 if ((error = carp_is_supported_if(ifp)) != 0)
2355 goto out;
2356
2357 hdr->nlmsg_flags |= NLM_F_MULTI;
2358 args.hdr = hdr;
2359 args.npt = npt;
2360
2361 carpr.carpr_vhid = attrs.vhid;
2362 carpr.carpr_count = CARP_MAXVHID;
2363
2364 sx_xlock(&carp_sx);
2365 error = carp_ioctl_get(ifp, nlp_get_cred(npt->nlp), &carpr,
2366 carp_nl_send, &args);
2367 sx_xunlock(&carp_sx);
2368
2369 if (! nlmsg_end_dump(npt->nw, error, hdr))
2370 error = ENOMEM;
2371
2372 out:
2373 if (ifp != NULL)
2374 if_rele(ifp);
2375
2376 return (error);
2377 }
2378
2379 static int
carp_nl_set(struct nlmsghdr * hdr,struct nl_pstate * npt)2380 carp_nl_set(struct nlmsghdr *hdr, struct nl_pstate *npt)
2381 {
2382 struct nl_carp_parsed attrs = { };
2383 struct carpkreq carpr;
2384 struct epoch_tracker et;
2385 if_t ifp = NULL;
2386 int error;
2387
2388 error = nl_parse_nlmsg(hdr, &carp_parser, npt, &attrs);
2389 if (error != 0)
2390 return (error);
2391
2392 if (attrs.vhid <= 0 || attrs.vhid > CARP_MAXVHID)
2393 return (EINVAL);
2394 if (attrs.state > CARP_MAXSTATE)
2395 return (EINVAL);
2396 if (attrs.advbase < 0 || attrs.advskew < 0)
2397 return (EINVAL);
2398 if (attrs.advbase > 255)
2399 return (EINVAL);
2400 if (attrs.advskew >= 255)
2401 return (EINVAL);
2402
2403 NET_EPOCH_ENTER(et);
2404 if (attrs.ifname != NULL)
2405 ifp = ifunit_ref(attrs.ifname);
2406 else if (attrs.ifindex != 0)
2407 ifp = ifnet_byindex_ref(attrs.ifindex);
2408 NET_EPOCH_EXIT(et);
2409
2410 if ((error = carp_is_supported_if(ifp)) != 0)
2411 goto out;
2412
2413 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
2414 error = EADDRNOTAVAIL;
2415 goto out;
2416 }
2417
2418 carpr.carpr_count = 1;
2419 carpr.carpr_vhid = attrs.vhid;
2420 carpr.carpr_state = attrs.state;
2421 carpr.carpr_advbase = attrs.advbase;
2422 carpr.carpr_advskew = attrs.advskew;
2423 carpr.carpr_addr = attrs.addr;
2424 carpr.carpr_addr6 = attrs.addr6;
2425
2426 memcpy(&carpr.carpr_key, &attrs.key, sizeof(attrs.key));
2427
2428 sx_xlock(&carp_sx);
2429 error = carp_ioctl_set(ifp, &carpr);
2430 sx_xunlock(&carp_sx);
2431
2432 out:
2433 if (ifp != NULL)
2434 if_rele(ifp);
2435
2436 return (error);
2437 }
2438
2439 static const struct nlhdr_parser *all_parsers[] = {
2440 &carp_parser
2441 };
2442
2443 static const struct genl_cmd carp_cmds[] = {
2444 {
2445 .cmd_num = CARP_NL_CMD_GET,
2446 .cmd_name = "SIOCGVH",
2447 .cmd_cb = carp_nl_get,
2448 .cmd_flags = GENL_CMD_CAP_DO | GENL_CMD_CAP_DUMP |
2449 GENL_CMD_CAP_HASPOL,
2450 },
2451 {
2452 .cmd_num = CARP_NL_CMD_SET,
2453 .cmd_name = "SIOCSVH",
2454 .cmd_cb = carp_nl_set,
2455 .cmd_flags = GENL_CMD_CAP_DO | GENL_CMD_CAP_HASPOL,
2456 .cmd_priv = PRIV_NETINET_CARP,
2457 },
2458 };
2459
2460 static void
carp_nl_register(void)2461 carp_nl_register(void)
2462 {
2463 bool ret __diagused;
2464 int family_id __diagused;
2465
2466 NL_VERIFY_PARSERS(all_parsers);
2467 family_id = genl_register_family(CARP_NL_FAMILY_NAME, 0, 2,
2468 CARP_NL_CMD_MAX);
2469 MPASS(family_id != 0);
2470
2471 ret = genl_register_cmds(CARP_NL_FAMILY_NAME, carp_cmds,
2472 NL_ARRAY_LEN(carp_cmds));
2473 MPASS(ret);
2474 }
2475
2476 static void
carp_nl_unregister(void)2477 carp_nl_unregister(void)
2478 {
2479 genl_unregister_family(CARP_NL_FAMILY_NAME);
2480 }
2481
2482 static void
carp_mod_cleanup(void)2483 carp_mod_cleanup(void)
2484 {
2485
2486 carp_nl_unregister();
2487
2488 #ifdef INET
2489 (void)ipproto_unregister(IPPROTO_CARP);
2490 carp_iamatch_p = NULL;
2491 #endif
2492 #ifdef INET6
2493 (void)ip6proto_unregister(IPPROTO_CARP);
2494 carp_iamatch6_p = NULL;
2495 carp_macmatch6_p = NULL;
2496 #endif
2497 carp_ioctl_p = NULL;
2498 carp_attach_p = NULL;
2499 carp_detach_p = NULL;
2500 carp_get_vhid_p = NULL;
2501 carp_linkstate_p = NULL;
2502 carp_forus_p = NULL;
2503 carp_output_p = NULL;
2504 carp_demote_adj_p = NULL;
2505 carp_master_p = NULL;
2506 mtx_unlock(&carp_mtx);
2507 taskqueue_drain(taskqueue_swi, &carp_sendall_task);
2508 mtx_destroy(&carp_mtx);
2509 sx_destroy(&carp_sx);
2510 }
2511
2512 static void
ipcarp_sysinit(void)2513 ipcarp_sysinit(void)
2514 {
2515
2516 /* Load allow as tunable so to postpone carp start after module load */
2517 TUNABLE_INT_FETCH("net.inet.carp.allow", &V_carp_allow);
2518 }
2519 VNET_SYSINIT(ip_carp, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY, ipcarp_sysinit, NULL);
2520
2521 static int
carp_mod_load(void)2522 carp_mod_load(void)
2523 {
2524 int err;
2525
2526 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF);
2527 sx_init(&carp_sx, "carp_sx");
2528 LIST_INIT(&carp_list);
2529 carp_get_vhid_p = carp_get_vhid;
2530 carp_forus_p = carp_forus;
2531 carp_output_p = carp_output;
2532 carp_linkstate_p = carp_linkstate;
2533 carp_ioctl_p = carp_ioctl;
2534 carp_attach_p = carp_attach;
2535 carp_detach_p = carp_detach;
2536 carp_demote_adj_p = carp_demote_adj;
2537 carp_master_p = carp_master;
2538 #ifdef INET6
2539 carp_iamatch6_p = carp_iamatch6;
2540 carp_macmatch6_p = carp_macmatch6;
2541 err = ip6proto_register(IPPROTO_CARP, carp6_input, NULL);
2542 if (err) {
2543 printf("carp: error %d registering with INET6\n", err);
2544 carp_mod_cleanup();
2545 return (err);
2546 }
2547 #endif
2548 #ifdef INET
2549 carp_iamatch_p = carp_iamatch;
2550 err = ipproto_register(IPPROTO_CARP, carp_input, NULL);
2551 if (err) {
2552 printf("carp: error %d registering with INET\n", err);
2553 carp_mod_cleanup();
2554 return (err);
2555 }
2556 #endif
2557
2558 carp_nl_register();
2559
2560 return (0);
2561 }
2562
2563 static int
carp_modevent(module_t mod,int type,void * data)2564 carp_modevent(module_t mod, int type, void *data)
2565 {
2566 switch (type) {
2567 case MOD_LOAD:
2568 return carp_mod_load();
2569 /* NOTREACHED */
2570 case MOD_UNLOAD:
2571 mtx_lock(&carp_mtx);
2572 if (LIST_EMPTY(&carp_list))
2573 carp_mod_cleanup();
2574 else {
2575 mtx_unlock(&carp_mtx);
2576 return (EBUSY);
2577 }
2578 break;
2579
2580 default:
2581 return (EINVAL);
2582 }
2583
2584 return (0);
2585 }
2586
2587 static moduledata_t carp_mod = {
2588 "carp",
2589 carp_modevent,
2590 0
2591 };
2592
2593 DECLARE_MODULE(carp, carp_mod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
2594