1 /* $NetBSD: ip_carp.c,v 1.119 2023/04/07 06:44:08 mlelstv Exp $ */
2 /* $OpenBSD: ip_carp.c,v 1.113 2005/11/04 08:11:54 mcbride Exp $ */
3
4 /*
5 * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
6 * Copyright (c) 2003 Ryan McBride. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
26 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
27 * THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #ifdef _KERNEL_OPT
31 #include "opt_inet.h"
32 #include "opt_mbuftrace.h"
33 #endif
34
35 #include <sys/cdefs.h>
36 __KERNEL_RCSID(0, "$NetBSD: ip_carp.c,v 1.119 2023/04/07 06:44:08 mlelstv Exp $");
37
38 /*
39 * TODO:
40 * - iface reconfigure
41 * - support for hardware checksum calculations;
42 *
43 */
44
45 #include <sys/param.h>
46 #include <sys/proc.h>
47 #include <sys/mbuf.h>
48 #include <sys/socket.h>
49 #include <sys/socketvar.h>
50 #include <sys/callout.h>
51 #include <sys/ioctl.h>
52 #include <sys/errno.h>
53 #include <sys/device.h>
54 #include <sys/time.h>
55 #include <sys/kernel.h>
56 #include <sys/kauth.h>
57 #include <sys/sysctl.h>
58 #include <sys/ucred.h>
59 #include <sys/syslog.h>
60 #include <sys/acct.h>
61 #include <sys/cprng.h>
62 #include <sys/cpu.h>
63 #include <sys/pserialize.h>
64 #include <sys/psref.h>
65
66 #include <net/if.h>
67 #include <net/pfil.h>
68 #include <net/if_types.h>
69 #include <net/if_ether.h>
70 #include <net/route.h>
71 #include <net/net_stats.h>
72 #include <netinet/if_inarp.h>
73 #include <netinet/wqinput.h>
74
75 #ifdef INET
76 #include <netinet/in.h>
77 #include <netinet/in_systm.h>
78 #include <netinet/in_var.h>
79 #include <netinet/ip.h>
80 #include <netinet/ip_var.h>
81
82 #include <net/if_dl.h>
83 #endif
84
85 #ifdef INET6
86 #include <netinet/icmp6.h>
87 #include <netinet/ip6.h>
88 #include <netinet6/ip6_var.h>
89 #include <netinet6/nd6.h>
90 #include <netinet6/scope6_var.h>
91 #include <netinet6/in6_var.h>
92 #endif
93
94 #include <net/bpf.h>
95
96 #include <sys/sha1.h>
97
98 #include <netinet/ip_carp.h>
99
100 #include "ioconf.h"
101
102 struct carp_mc_entry {
103 LIST_ENTRY(carp_mc_entry) mc_entries;
104 union {
105 struct ether_multi *mcu_enm;
106 } mc_u;
107 struct sockaddr_storage mc_addr;
108 };
109 #define mc_enm mc_u.mcu_enm
110
111 struct carp_softc {
112 struct ethercom sc_ac;
113 #define sc_if sc_ac.ec_if
114 #define sc_carpdev sc_ac.ec_if.if_carpdev
115 void *sc_linkstate_hook;
116 int ah_cookie;
117 int lh_cookie;
118 struct ip_moptions sc_imo;
119 #ifdef INET6
120 struct ip6_moptions sc_im6o;
121 #endif /* INET6 */
122 TAILQ_ENTRY(carp_softc) sc_list;
123
124 enum { INIT = 0, BACKUP, MASTER } sc_state;
125
126 int sc_suppress;
127 int sc_bow_out;
128
129 int sc_sendad_errors;
130 #define CARP_SENDAD_MAX_ERRORS 3
131 int sc_sendad_success;
132 #define CARP_SENDAD_MIN_SUCCESS 3
133
134 int sc_vhid;
135 int sc_advskew;
136 int sc_naddrs;
137 int sc_naddrs6;
138 int sc_advbase; /* seconds */
139 int sc_init_counter;
140 u_int64_t sc_counter;
141
142 /* authentication */
143 #define CARP_HMAC_PAD 64
144 unsigned char sc_key[CARP_KEY_LEN];
145 unsigned char sc_pad[CARP_HMAC_PAD];
146 SHA1_CTX sc_sha1;
147 u_int32_t sc_hashkey[2];
148
149 struct callout sc_ad_tmo; /* advertisement timeout */
150 struct callout sc_md_tmo; /* master down timeout */
151 struct callout sc_md6_tmo; /* master down timeout */
152
153 LIST_HEAD(__carp_mchead, carp_mc_entry) carp_mc_listhead;
154 };
155
156 int carp_suppress_preempt = 0;
157 static int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 0, 0 }; /* XXX for now */
158
159 static percpu_t *carpstat_percpu;
160
161 #define CARP_STATINC(x) _NET_STATINC(carpstat_percpu, x)
162
163 #ifdef MBUFTRACE
164 static struct mowner carp_proto_mowner_rx = MOWNER_INIT("carp", "rx");
165 static struct mowner carp_proto_mowner_tx = MOWNER_INIT("carp", "tx");
166 static struct mowner carp_proto6_mowner_rx = MOWNER_INIT("carp6", "rx");
167 static struct mowner carp_proto6_mowner_tx = MOWNER_INIT("carp6", "tx");
168 #endif
169
170 struct carp_if {
171 TAILQ_HEAD(, carp_softc) vhif_vrs;
172 int vhif_nvrs;
173
174 struct ifnet *vhif_ifp;
175 };
176
177 #define CARP_LOG(sc, s) \
178 if (carp_opts[CARPCTL_LOG]) { \
179 if (sc) \
180 log(LOG_INFO, "%s: ", \
181 (sc)->sc_if.if_xname); \
182 else \
183 log(LOG_INFO, "carp: "); \
184 addlog s; \
185 addlog("\n"); \
186 }
187
188 static void carp_hmac_prepare(struct carp_softc *);
189 static void carp_hmac_generate(struct carp_softc *, u_int32_t *,
190 unsigned char *);
191 static int carp_hmac_verify(struct carp_softc *, u_int32_t *,
192 unsigned char *);
193 static void carp_setroute(struct carp_softc *, int);
194 static void carp_proto_input_c(struct mbuf *, struct carp_header *,
195 sa_family_t);
196 static void carpdetach(struct carp_softc *);
197 static void carp_prepare_ad(struct mbuf *, struct carp_softc *,
198 struct carp_header *);
199 static void carp_send_ad_all(void);
200 static void carp_send_ad(void *);
201 static void carp_send_arp(struct carp_softc *);
202 static void carp_master_down(void *);
203 static int carp_ioctl(struct ifnet *, u_long, void *);
204 static void carp_start(struct ifnet *);
205 static void carp_setrun(struct carp_softc *, sa_family_t);
206 static void carp_set_state(struct carp_softc *, int);
207 static int carp_addrcount(struct carp_if *, struct in_ifaddr *, int);
208 enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING };
209
210 static void carp_multicast_cleanup(struct carp_softc *);
211 static int carp_set_ifp(struct carp_softc *, struct ifnet *);
212 static void carp_set_enaddr(struct carp_softc *);
213 #if 0
214 static void carp_addr_updated(void *);
215 #endif
216 static u_int32_t carp_hash(struct carp_softc *, u_char *);
217 static int carp_set_addr(struct carp_softc *, struct sockaddr_in *);
218 static int carp_join_multicast(struct carp_softc *);
219 #ifdef INET6
220 static void carp_send_na(struct carp_softc *);
221 static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *);
222 static int carp_join_multicast6(struct carp_softc *);
223 #endif
224 static int carp_clone_create(struct if_clone *, int);
225 static int carp_clone_destroy(struct ifnet *);
226 static int carp_ether_addmulti(struct carp_softc *, struct ifreq *);
227 static int carp_ether_delmulti(struct carp_softc *, struct ifreq *);
228 static void carp_ether_purgemulti(struct carp_softc *);
229 static void carp_update_link_state(struct carp_softc *sc);
230
231 static void sysctl_net_inet_carp_setup(struct sysctllog **);
232
233 /* workqueue-based pr_input */
234 static struct wqinput *carp_wqinput;
235 static void _carp_proto_input(struct mbuf *, int, int);
236 #ifdef INET6
237 static struct wqinput *carp6_wqinput;
238 static void _carp6_proto_input(struct mbuf *, int, int);
239 #endif
240
241 struct if_clone carp_cloner =
242 IF_CLONE_INITIALIZER("carp", carp_clone_create, carp_clone_destroy);
243
244 static __inline u_int16_t
carp_cksum(struct mbuf * m,int len)245 carp_cksum(struct mbuf *m, int len)
246 {
247 return (in_cksum(m, len));
248 }
249
250 #ifdef INET6
251 static __inline u_int16_t
carp6_cksum(struct mbuf * m,uint32_t off,uint32_t len)252 carp6_cksum(struct mbuf *m, uint32_t off, uint32_t len)
253 {
254 return (in6_cksum(m, IPPROTO_CARP, off, len));
255 }
256 #endif
257
258 static void
carp_hmac_prepare(struct carp_softc * sc)259 carp_hmac_prepare(struct carp_softc *sc)
260 {
261 u_int8_t carp_version = CARP_VERSION, type = CARP_ADVERTISEMENT;
262 u_int8_t vhid = sc->sc_vhid & 0xff;
263 SHA1_CTX sha1ctx;
264 u_int32_t kmd[5];
265 struct ifaddr *ifa;
266 int i, found;
267 struct in_addr last, cur, in;
268 #ifdef INET6
269 struct in6_addr last6, cur6, in6;
270 #endif /* INET6 */
271
272 /* compute ipad from key */
273 memset(sc->sc_pad, 0, sizeof(sc->sc_pad));
274 memcpy(sc->sc_pad, sc->sc_key, sizeof(sc->sc_key));
275 for (i = 0; i < sizeof(sc->sc_pad); i++)
276 sc->sc_pad[i] ^= 0x36;
277
278 /* precompute first part of inner hash */
279 SHA1Init(&sc->sc_sha1);
280 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
281 SHA1Update(&sc->sc_sha1, (void *)&carp_version, sizeof(carp_version));
282 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
283
284 /* generate a key for the arpbalance hash, before the vhid is hashed */
285 memcpy(&sha1ctx, &sc->sc_sha1, sizeof(sha1ctx));
286 SHA1Final((unsigned char *)kmd, &sha1ctx);
287 sc->sc_hashkey[0] = kmd[0] ^ kmd[1];
288 sc->sc_hashkey[1] = kmd[2] ^ kmd[3];
289
290 /* the rest of the precomputation */
291 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
292
293 /* Hash the addresses from smallest to largest, not interface order */
294 #ifdef INET
295 cur.s_addr = 0;
296 do {
297 int s;
298 found = 0;
299 last = cur;
300 cur.s_addr = 0xffffffff;
301 s = pserialize_read_enter();
302 IFADDR_READER_FOREACH(ifa, &sc->sc_if) {
303 in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr;
304 if (ifa->ifa_addr->sa_family == AF_INET &&
305 ntohl(in.s_addr) > ntohl(last.s_addr) &&
306 ntohl(in.s_addr) < ntohl(cur.s_addr)) {
307 cur.s_addr = in.s_addr;
308 found++;
309 }
310 }
311 pserialize_read_exit(s);
312 if (found)
313 SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur));
314 } while (found);
315 #endif /* INET */
316
317 #ifdef INET6
318 memset(&cur6, 0x00, sizeof(cur6));
319 do {
320 int s;
321 found = 0;
322 last6 = cur6;
323 memset(&cur6, 0xff, sizeof(cur6));
324 s = pserialize_read_enter();
325 IFADDR_READER_FOREACH(ifa, &sc->sc_if) {
326 in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
327 if (IN6_IS_ADDR_LINKLOCAL(&in6))
328 in6.s6_addr16[1] = 0;
329 if (ifa->ifa_addr->sa_family == AF_INET6 &&
330 memcmp(&in6, &last6, sizeof(in6)) > 0 &&
331 memcmp(&in6, &cur6, sizeof(in6)) < 0) {
332 cur6 = in6;
333 found++;
334 }
335 }
336 pserialize_read_exit(s);
337 if (found)
338 SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6));
339 } while (found);
340 #endif /* INET6 */
341
342 /* convert ipad to opad */
343 for (i = 0; i < sizeof(sc->sc_pad); i++)
344 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
345 }
346
347 static void
carp_hmac_generate(struct carp_softc * sc,u_int32_t counter[2],unsigned char md[20])348 carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2],
349 unsigned char md[20])
350 {
351 SHA1_CTX sha1ctx;
352
353 /* fetch first half of inner hash */
354 memcpy(&sha1ctx, &sc->sc_sha1, sizeof(sha1ctx));
355
356 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
357 SHA1Final(md, &sha1ctx);
358
359 /* outer hash */
360 SHA1Init(&sha1ctx);
361 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
362 SHA1Update(&sha1ctx, md, 20);
363 SHA1Final(md, &sha1ctx);
364 }
365
366 static int
carp_hmac_verify(struct carp_softc * sc,u_int32_t counter[2],unsigned char md[20])367 carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2],
368 unsigned char md[20])
369 {
370 unsigned char md2[20];
371
372 carp_hmac_generate(sc, counter, md2);
373
374 return (memcmp(md, md2, sizeof(md2)));
375 }
376
377 static void
carp_setroute(struct carp_softc * sc,int cmd)378 carp_setroute(struct carp_softc *sc, int cmd)
379 {
380 struct ifaddr *ifa;
381 int s, bound;
382
383 KERNEL_LOCK(1, NULL);
384 bound = curlwp_bind();
385 s = pserialize_read_enter();
386 IFADDR_READER_FOREACH(ifa, &sc->sc_if) {
387 struct psref psref;
388 ifa_acquire(ifa, &psref);
389 pserialize_read_exit(s);
390
391 switch (ifa->ifa_addr->sa_family) {
392 case AF_INET: {
393 int count = 0;
394 struct rtentry *rt;
395 int hr_otherif, nr_ourif;
396
397 /*
398 * Avoid screwing with the routes if there are other
399 * carp interfaces which are master and have the same
400 * address.
401 */
402 if (sc->sc_carpdev != NULL &&
403 sc->sc_carpdev->if_carp != NULL) {
404 count = carp_addrcount(
405 (struct carp_if *)sc->sc_carpdev->if_carp,
406 ifatoia(ifa), CARP_COUNT_MASTER);
407 if ((cmd == RTM_ADD && count != 1) ||
408 (cmd == RTM_DELETE && count != 0))
409 goto next;
410 }
411
412 /* Remove the existing host route, if any */
413 rtrequest(RTM_DELETE, ifa->ifa_addr,
414 ifa->ifa_addr, ifa->ifa_netmask,
415 RTF_HOST, NULL);
416
417 rt = NULL;
418 (void)rtrequest(RTM_GET, ifa->ifa_addr, ifa->ifa_addr,
419 ifa->ifa_netmask, RTF_HOST, &rt);
420 hr_otherif = (rt && rt->rt_ifp != &sc->sc_if &&
421 (rt->rt_flags & RTF_CONNECTED));
422 if (rt != NULL) {
423 rt_unref(rt);
424 rt = NULL;
425 }
426
427 /* Check for a network route on our interface */
428
429 rt = NULL;
430 (void)rtrequest(RTM_GET, ifa->ifa_addr, ifa->ifa_addr,
431 ifa->ifa_netmask, 0, &rt);
432 nr_ourif = (rt && rt->rt_ifp == &sc->sc_if);
433
434 switch (cmd) {
435 case RTM_ADD:
436 if (hr_otherif) {
437 ifa->ifa_rtrequest = NULL;
438 ifa->ifa_flags &= ~RTF_CONNECTED;
439
440 rtrequest(RTM_ADD, ifa->ifa_addr,
441 ifa->ifa_addr, ifa->ifa_netmask,
442 RTF_UP | RTF_HOST, NULL);
443 }
444 if (!hr_otherif || nr_ourif || !rt) {
445 if (nr_ourif &&
446 (rt->rt_flags & RTF_CONNECTED) == 0)
447 rtrequest(RTM_DELETE,
448 ifa->ifa_addr,
449 ifa->ifa_addr,
450 ifa->ifa_netmask, 0, NULL);
451
452 ifa->ifa_rtrequest = arp_rtrequest;
453 ifa->ifa_flags |= RTF_CONNECTED;
454
455 if (rtrequest(RTM_ADD, ifa->ifa_addr,
456 ifa->ifa_addr, ifa->ifa_netmask, 0,
457 NULL) == 0)
458 ifa->ifa_flags |= IFA_ROUTE;
459 }
460 break;
461 case RTM_DELETE:
462 break;
463 default:
464 break;
465 }
466 if (rt != NULL) {
467 rt_unref(rt);
468 rt = NULL;
469 }
470 break;
471 }
472
473 #ifdef INET6
474 case AF_INET6:
475 if (cmd == RTM_ADD)
476 in6_ifaddlocal(ifa);
477 else
478 in6_ifremlocal(ifa);
479 break;
480 #endif /* INET6 */
481 default:
482 break;
483 }
484 next:
485 s = pserialize_read_enter();
486 ifa_release(ifa, &psref);
487 }
488 pserialize_read_exit(s);
489 curlwp_bindx(bound);
490 KERNEL_UNLOCK_ONE(NULL);
491 }
492
493 /*
494 * process input packet.
495 * we have rearranged checks order compared to the rfc,
496 * but it seems more efficient this way or not possible otherwise.
497 */
498 static void
_carp_proto_input(struct mbuf * m,int hlen,int proto)499 _carp_proto_input(struct mbuf *m, int hlen, int proto)
500 {
501 struct ip *ip = mtod(m, struct ip *);
502 struct carp_softc *sc = NULL;
503 struct carp_header *ch;
504 int iplen, len;
505 struct ifnet *rcvif;
506
507 CARP_STATINC(CARP_STAT_IPACKETS);
508 MCLAIM(m, &carp_proto_mowner_rx);
509
510 if (!carp_opts[CARPCTL_ALLOW]) {
511 m_freem(m);
512 return;
513 }
514
515 rcvif = m_get_rcvif_NOMPSAFE(m);
516 /* check if received on a valid carp interface */
517 if (rcvif->if_type != IFT_CARP) {
518 CARP_STATINC(CARP_STAT_BADIF);
519 CARP_LOG(sc, ("packet received on non-carp interface: %s",
520 rcvif->if_xname));
521 m_freem(m);
522 return;
523 }
524
525 /* verify that the IP TTL is 255. */
526 if (ip->ip_ttl != CARP_DFLTTL) {
527 CARP_STATINC(CARP_STAT_BADTTL);
528 CARP_LOG(sc, ("received ttl %d != %d on %s", ip->ip_ttl,
529 CARP_DFLTTL, rcvif->if_xname));
530 m_freem(m);
531 return;
532 }
533
534 /*
535 * verify that the received packet length is
536 * equal to the CARP header
537 */
538 iplen = ip->ip_hl << 2;
539 len = iplen + sizeof(*ch);
540 if (len > m->m_pkthdr.len) {
541 CARP_STATINC(CARP_STAT_BADLEN);
542 CARP_LOG(sc, ("packet too short %d on %s", m->m_pkthdr.len,
543 rcvif->if_xname));
544 m_freem(m);
545 return;
546 }
547
548 if ((m = m_pullup(m, len)) == NULL) {
549 CARP_STATINC(CARP_STAT_HDROPS);
550 return;
551 }
552 ip = mtod(m, struct ip *);
553 ch = (struct carp_header *)((char *)ip + iplen);
554 /* verify the CARP checksum */
555 m->m_data += iplen;
556 if (carp_cksum(m, len - iplen)) {
557 CARP_STATINC(CARP_STAT_BADSUM);
558 CARP_LOG(sc, ("checksum failed on %s",
559 rcvif->if_xname));
560 m_freem(m);
561 return;
562 }
563 m->m_data -= iplen;
564
565 carp_proto_input_c(m, ch, AF_INET);
566 }
567
568 void
carp_proto_input(struct mbuf * m,int off,int proto)569 carp_proto_input(struct mbuf *m, int off, int proto)
570 {
571
572 wqinput_input(carp_wqinput, m, 0, 0);
573 }
574
575 #ifdef INET6
576 static void
_carp6_proto_input(struct mbuf * m,int off,int proto)577 _carp6_proto_input(struct mbuf *m, int off, int proto)
578 {
579 struct carp_softc *sc = NULL;
580 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
581 struct carp_header *ch;
582 u_int len;
583 struct ifnet *rcvif;
584
585 CARP_STATINC(CARP_STAT_IPACKETS6);
586 MCLAIM(m, &carp_proto6_mowner_rx);
587
588 if (!carp_opts[CARPCTL_ALLOW]) {
589 m_freem(m);
590 return;
591 }
592
593 rcvif = m_get_rcvif_NOMPSAFE(m);
594
595 /* check if received on a valid carp interface */
596 if (rcvif->if_type != IFT_CARP) {
597 CARP_STATINC(CARP_STAT_BADIF);
598 CARP_LOG(sc, ("packet received on non-carp interface: %s",
599 rcvif->if_xname));
600 m_freem(m);
601 return;
602 }
603
604 /* verify that the IP TTL is 255 */
605 if (ip6->ip6_hlim != CARP_DFLTTL) {
606 CARP_STATINC(CARP_STAT_BADTTL);
607 CARP_LOG(sc, ("received ttl %d != %d on %s", ip6->ip6_hlim,
608 CARP_DFLTTL, rcvif->if_xname));
609 m_freem(m);
610 return;
611 }
612
613 /* verify that we have a complete carp packet */
614 len = m->m_len;
615 M_REGION_GET(ch, struct carp_header *, m, off, sizeof(*ch));
616 if (ch == NULL) {
617 CARP_STATINC(CARP_STAT_BADLEN);
618 CARP_LOG(sc, ("packet size %u too small", len));
619 return;
620 }
621
622 /* verify the CARP checksum */
623 if (carp6_cksum(m, off, sizeof(*ch))) {
624 CARP_STATINC(CARP_STAT_BADSUM);
625 CARP_LOG(sc, ("checksum failed, on %s", rcvif->if_xname));
626 m_freem(m);
627 return;
628 }
629
630 carp_proto_input_c(m, ch, AF_INET6);
631 return;
632 }
633
634 int
carp6_proto_input(struct mbuf ** mp,int * offp,int proto)635 carp6_proto_input(struct mbuf **mp, int *offp, int proto)
636 {
637
638 wqinput_input(carp6_wqinput, *mp, *offp, proto);
639
640 return IPPROTO_DONE;
641 }
642 #endif /* INET6 */
643
644 static void
carp_proto_input_c(struct mbuf * m,struct carp_header * ch,sa_family_t af)645 carp_proto_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af)
646 {
647 struct carp_softc *sc;
648 u_int64_t tmp_counter;
649 struct timeval sc_tv, ch_tv;
650
651 TAILQ_FOREACH(sc, &((struct carp_if *)
652 m_get_rcvif_NOMPSAFE(m)->if_carpdev->if_carp)->vhif_vrs, sc_list)
653 if (sc->sc_vhid == ch->carp_vhid)
654 break;
655
656 if (!sc || (sc->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) !=
657 (IFF_UP|IFF_RUNNING)) {
658 CARP_STATINC(CARP_STAT_BADVHID);
659 m_freem(m);
660 return;
661 }
662
663 /*
664 * Check if our own advertisement was duplicated
665 * from a non simplex interface.
666 * XXX If there is no address on our physical interface
667 * there is no way to distinguish our ads from the ones
668 * another carp host might have sent us.
669 */
670 if ((sc->sc_carpdev->if_flags & IFF_SIMPLEX) == 0) {
671 struct sockaddr sa;
672 struct ifaddr *ifa;
673 int s;
674
675 memset(&sa, 0, sizeof(sa));
676 sa.sa_family = af;
677 s = pserialize_read_enter();
678 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev);
679
680 if (ifa && af == AF_INET) {
681 struct ip *ip = mtod(m, struct ip *);
682 if (ip->ip_src.s_addr ==
683 ifatoia(ifa)->ia_addr.sin_addr.s_addr) {
684 pserialize_read_exit(s);
685 m_freem(m);
686 return;
687 }
688 }
689 #ifdef INET6
690 if (ifa && af == AF_INET6) {
691 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
692 struct in6_addr in6_src, in6_found;
693
694 in6_src = ip6->ip6_src;
695 in6_found = ifatoia6(ifa)->ia_addr.sin6_addr;
696 if (IN6_IS_ADDR_LINKLOCAL(&in6_src))
697 in6_src.s6_addr16[1] = 0;
698 if (IN6_IS_ADDR_LINKLOCAL(&in6_found))
699 in6_found.s6_addr16[1] = 0;
700 if (IN6_ARE_ADDR_EQUAL(&in6_src, &in6_found)) {
701 pserialize_read_exit(s);
702 m_freem(m);
703 return;
704 }
705 }
706 #endif /* INET6 */
707 pserialize_read_exit(s);
708 }
709
710 nanotime(&sc->sc_if.if_lastchange);
711 if_statadd2(&sc->sc_if, if_ipackets, 1, if_ibytes, m->m_pkthdr.len);
712
713 /* verify the CARP version. */
714 if (ch->carp_version != CARP_VERSION) {
715 CARP_STATINC(CARP_STAT_BADVER);
716 if_statinc(&sc->sc_if, if_ierrors);
717 CARP_LOG(sc, ("invalid version %d != %d",
718 ch->carp_version, CARP_VERSION));
719 m_freem(m);
720 return;
721 }
722
723 /* verify the hash */
724 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
725 struct ip *ip;
726 char ipbuf[INET_ADDRSTRLEN];
727 #ifdef INET6
728 struct ip6_hdr *ip6;
729 char ip6buf[INET6_ADDRSTRLEN];
730 #endif
731
732 CARP_STATINC(CARP_STAT_BADAUTH);
733 if_statinc(&sc->sc_if, if_ierrors);
734
735 switch(af) {
736 case AF_INET:
737 ip = mtod(m, struct ip *);
738 CARP_LOG(sc, ("incorrect hash from %s",
739 IN_PRINT(ipbuf, &ip->ip_src)));
740 break;
741
742 #ifdef INET6
743 case AF_INET6:
744 ip6 = mtod(m, struct ip6_hdr *);
745 CARP_LOG(sc, ("incorrect hash from %s",
746 IN6_PRINT(ip6buf, &ip6->ip6_src)));
747 break;
748 #endif
749
750 default: CARP_LOG(sc, ("incorrect hash"));
751 break;
752 }
753 m_freem(m);
754 return;
755 }
756
757 tmp_counter = ntohl(ch->carp_counter[0]);
758 tmp_counter = tmp_counter<<32;
759 tmp_counter += ntohl(ch->carp_counter[1]);
760
761 /* XXX Replay protection goes here */
762
763 sc->sc_init_counter = 0;
764 sc->sc_counter = tmp_counter;
765
766
767 sc_tv.tv_sec = sc->sc_advbase;
768 if (carp_suppress_preempt && sc->sc_advskew < 240)
769 sc_tv.tv_usec = 240 * 1000000 / 256;
770 else
771 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256;
772 ch_tv.tv_sec = ch->carp_advbase;
773 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
774
775 switch (sc->sc_state) {
776 case INIT:
777 break;
778 case MASTER:
779 /*
780 * If we receive an advertisement from a backup who's going to
781 * be more frequent than us, go into BACKUP state.
782 */
783 if (timercmp(&sc_tv, &ch_tv, >) ||
784 timercmp(&sc_tv, &ch_tv, ==)) {
785 callout_stop(&sc->sc_ad_tmo);
786 CARP_LOG(sc, ("MASTER -> BACKUP (more frequent advertisement received)"));
787 carp_set_state(sc, BACKUP);
788 carp_setrun(sc, 0);
789 carp_setroute(sc, RTM_DELETE);
790 }
791 break;
792 case BACKUP:
793 /*
794 * If we're pre-empting masters who advertise slower than us,
795 * and this one claims to be slower, treat him as down.
796 */
797 if (carp_opts[CARPCTL_PREEMPT] && timercmp(&sc_tv, &ch_tv, <)) {
798 CARP_LOG(sc, ("BACKUP -> MASTER (preempting a slower master)"));
799 carp_master_down(sc);
800 break;
801 }
802
803 /*
804 * If the master is going to advertise at such a low frequency
805 * that he's guaranteed to time out, we'd might as well just
806 * treat him as timed out now.
807 */
808 sc_tv.tv_sec = sc->sc_advbase * 3;
809 if (timercmp(&sc_tv, &ch_tv, <)) {
810 CARP_LOG(sc, ("BACKUP -> MASTER (master timed out)"));
811 carp_master_down(sc);
812 break;
813 }
814
815 /*
816 * Otherwise, we reset the counter and wait for the next
817 * advertisement.
818 */
819 carp_setrun(sc, af);
820 break;
821 }
822
823 m_freem(m);
824 return;
825 }
826
827 /*
828 * Interface side of the CARP implementation.
829 */
830
831 /* ARGSUSED */
832 void
carpattach(int n)833 carpattach(int n)
834 {
835 if_clone_attach(&carp_cloner);
836
837 carpstat_percpu = percpu_alloc(sizeof(uint64_t) * CARP_NSTATS);
838 }
839
840 static int
carp_clone_create(struct if_clone * ifc,int unit)841 carp_clone_create(struct if_clone *ifc, int unit)
842 {
843 extern int ifqmaxlen;
844 struct carp_softc *sc;
845 struct ifnet *ifp;
846
847 sc = malloc(sizeof(*sc), M_DEVBUF, M_NOWAIT|M_ZERO);
848 if (!sc)
849 return (ENOMEM);
850
851 sc->sc_suppress = 0;
852 sc->sc_advbase = CARP_DFLTINTV;
853 sc->sc_vhid = -1; /* required setting */
854 sc->sc_advskew = 0;
855 sc->sc_init_counter = 1;
856 sc->sc_naddrs = sc->sc_naddrs6 = 0;
857 #ifdef INET6
858 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
859 #endif /* INET6 */
860
861 callout_init(&sc->sc_ad_tmo, 0);
862 callout_init(&sc->sc_md_tmo, 0);
863 callout_init(&sc->sc_md6_tmo, 0);
864
865 callout_setfunc(&sc->sc_ad_tmo, carp_send_ad, sc);
866 callout_setfunc(&sc->sc_md_tmo, carp_master_down, sc);
867 callout_setfunc(&sc->sc_md6_tmo, carp_master_down, sc);
868
869 LIST_INIT(&sc->carp_mc_listhead);
870 ifp = &sc->sc_if;
871 ifp->if_softc = sc;
872 snprintf(ifp->if_xname, sizeof ifp->if_xname, "%s%d", ifc->ifc_name,
873 unit);
874 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
875 ifp->if_ioctl = carp_ioctl;
876 ifp->if_start = carp_start;
877 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
878 IFQ_SET_READY(&ifp->if_snd);
879 if_initialize(ifp);
880 ether_ifattach(ifp, NULL);
881 /* Overwrite ethernet defaults */
882 ifp->if_type = IFT_CARP;
883 ifp->if_output = carp_output;
884 ifp->if_link_state = LINK_STATE_DOWN;
885 carp_set_enaddr(sc);
886 if_register(ifp);
887
888 return (0);
889 }
890
891 static int
carp_clone_destroy(struct ifnet * ifp)892 carp_clone_destroy(struct ifnet *ifp)
893 {
894 struct carp_softc *sc = ifp->if_softc;
895
896 carpdetach(ifp->if_softc);
897 ether_ifdetach(ifp);
898 if_detach(ifp);
899 callout_destroy(&sc->sc_ad_tmo);
900 callout_destroy(&sc->sc_md_tmo);
901 callout_destroy(&sc->sc_md6_tmo);
902 free(ifp->if_softc, M_DEVBUF);
903
904 return (0);
905 }
906
907 static void
carpdetach(struct carp_softc * sc)908 carpdetach(struct carp_softc *sc)
909 {
910 struct ifnet *ifp;
911 struct carp_if *cif;
912 int s;
913
914 callout_stop(&sc->sc_ad_tmo);
915 callout_stop(&sc->sc_md_tmo);
916 callout_stop(&sc->sc_md6_tmo);
917
918 if (sc->sc_suppress)
919 carp_suppress_preempt--;
920 sc->sc_suppress = 0;
921
922 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
923 carp_suppress_preempt--;
924 sc->sc_sendad_errors = 0;
925
926 carp_set_state(sc, INIT);
927 sc->sc_if.if_flags &= ~IFF_UP;
928 carp_setrun(sc, 0);
929 carp_multicast_cleanup(sc);
930
931 KERNEL_LOCK(1, NULL);
932 s = splnet();
933 ifp = sc->sc_carpdev;
934 if (ifp != NULL) {
935 if_linkstate_change_disestablish(ifp,
936 sc->sc_linkstate_hook, NULL);
937
938 cif = (struct carp_if *)ifp->if_carp;
939 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
940 if (!--cif->vhif_nvrs) {
941 ifpromisc(ifp, 0);
942 ifp->if_carp = NULL;
943 free(cif, M_IFADDR);
944 }
945 }
946 sc->sc_carpdev = NULL;
947 splx(s);
948 KERNEL_UNLOCK_ONE(NULL);
949 }
950
951 /* Detach an interface from the carp. */
952 void
carp_ifdetach(struct ifnet * ifp)953 carp_ifdetach(struct ifnet *ifp)
954 {
955 struct carp_softc *sc, *nextsc;
956 struct carp_if *cif = (struct carp_if *)ifp->if_carp;
957
958 for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) {
959 nextsc = TAILQ_NEXT(sc, sc_list);
960 carpdetach(sc);
961 }
962 }
963
964 static void
carp_prepare_ad(struct mbuf * m,struct carp_softc * sc,struct carp_header * ch)965 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc,
966 struct carp_header *ch)
967 {
968 if (sc->sc_init_counter) {
969 /* this could also be seconds since unix epoch */
970 sc->sc_counter = cprng_fast64();
971 } else
972 sc->sc_counter++;
973
974 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff);
975 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff);
976
977 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
978 }
979
980 static void
carp_send_ad_all(void)981 carp_send_ad_all(void)
982 {
983 struct ifnet *ifp;
984 struct carp_if *cif;
985 struct carp_softc *vh;
986 int s;
987 int bound = curlwp_bind();
988
989 s = pserialize_read_enter();
990 IFNET_READER_FOREACH(ifp) {
991 struct psref psref;
992 if (ifp->if_carp == NULL || ifp->if_type == IFT_CARP)
993 continue;
994
995 if_acquire(ifp, &psref);
996 pserialize_read_exit(s);
997
998 cif = (struct carp_if *)ifp->if_carp;
999 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1000 if ((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) ==
1001 (IFF_UP|IFF_RUNNING) && vh->sc_state == MASTER)
1002 carp_send_ad(vh);
1003 }
1004
1005 s = pserialize_read_enter();
1006 if_release(ifp, &psref);
1007 }
1008 pserialize_read_exit(s);
1009 curlwp_bindx(bound);
1010 }
1011
1012
1013 static void
carp_send_ad(void * v)1014 carp_send_ad(void *v)
1015 {
1016 struct carp_header ch;
1017 struct timeval tv;
1018 struct carp_softc *sc = v;
1019 struct carp_header *ch_ptr;
1020 struct mbuf *m;
1021 int error, len, advbase, advskew, s;
1022 struct sockaddr sa;
1023
1024 KERNEL_LOCK(1, NULL);
1025 s = splsoftnet();
1026
1027 advbase = advskew = 0; /* Sssssh compiler */
1028 if (sc->sc_carpdev == NULL) {
1029 if_statinc(&sc->sc_if, if_oerrors);
1030 goto retry_later;
1031 }
1032
1033 /* bow out if we've gone to backup (the carp interface is going down) */
1034 if (sc->sc_bow_out) {
1035 sc->sc_bow_out = 0;
1036 advbase = 255;
1037 advskew = 255;
1038 } else {
1039 advbase = sc->sc_advbase;
1040 if (!carp_suppress_preempt || sc->sc_advskew > 240)
1041 advskew = sc->sc_advskew;
1042 else
1043 advskew = 240;
1044 tv.tv_sec = advbase;
1045 tv.tv_usec = advskew * 1000000 / 256;
1046 }
1047
1048 ch.carp_version = CARP_VERSION;
1049 ch.carp_type = CARP_ADVERTISEMENT;
1050 ch.carp_vhid = sc->sc_vhid;
1051 ch.carp_advbase = advbase;
1052 ch.carp_advskew = advskew;
1053 ch.carp_authlen = 7; /* XXX DEFINE */
1054 ch.carp_pad1 = 0; /* must be zero */
1055 ch.carp_cksum = 0;
1056
1057
1058 #ifdef INET
1059 if (sc->sc_naddrs) {
1060 struct ip *ip;
1061 struct ifaddr *ifa;
1062 int _s;
1063
1064 MGETHDR(m, M_DONTWAIT, MT_HEADER);
1065 if (m == NULL) {
1066 if_statinc(&sc->sc_if, if_oerrors);
1067 CARP_STATINC(CARP_STAT_ONOMEM);
1068 /* XXX maybe less ? */
1069 goto retry_later;
1070 }
1071 MCLAIM(m, &carp_proto_mowner_tx);
1072 len = sizeof(*ip) + sizeof(ch);
1073 m->m_pkthdr.len = len;
1074 m_reset_rcvif(m);
1075 m->m_len = len;
1076 m_align(m, m->m_len);
1077 m->m_flags |= M_MCAST;
1078 ip = mtod(m, struct ip *);
1079 ip->ip_v = IPVERSION;
1080 ip->ip_hl = sizeof(*ip) >> 2;
1081 ip->ip_tos = IPTOS_LOWDELAY;
1082 ip->ip_len = htons(len);
1083 ip->ip_id = 0; /* no need for id, we don't support fragments */
1084 ip->ip_off = htons(IP_DF);
1085 ip->ip_ttl = CARP_DFLTTL;
1086 ip->ip_p = IPPROTO_CARP;
1087 ip->ip_sum = 0;
1088
1089 memset(&sa, 0, sizeof(sa));
1090 sa.sa_family = AF_INET;
1091 _s = pserialize_read_enter();
1092 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev);
1093 if (ifa == NULL)
1094 ifa = ifaof_ifpforaddr(&sa, &sc->sc_if);
1095 if (ifa == NULL)
1096 ip->ip_src.s_addr = 0;
1097 else
1098 ip->ip_src.s_addr =
1099 ifatoia(ifa)->ia_addr.sin_addr.s_addr;
1100 pserialize_read_exit(_s);
1101 ip->ip_dst.s_addr = INADDR_CARP_GROUP;
1102
1103 ch_ptr = (struct carp_header *)(&ip[1]);
1104 memcpy(ch_ptr, &ch, sizeof(ch));
1105 carp_prepare_ad(m, sc, ch_ptr);
1106
1107 m->m_data += sizeof(*ip);
1108 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip));
1109 m->m_data -= sizeof(*ip);
1110
1111 nanotime(&sc->sc_if.if_lastchange);
1112 if_statadd2(&sc->sc_if, if_opackets, 1, if_obytes, len);
1113 CARP_STATINC(CARP_STAT_OPACKETS);
1114
1115 error = ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo,
1116 NULL);
1117 if (error) {
1118 if (error == ENOBUFS)
1119 CARP_STATINC(CARP_STAT_ONOMEM);
1120 else
1121 CARP_LOG(sc, ("ip_output failed: %d", error));
1122 if_statinc(&sc->sc_if, if_oerrors);
1123 if (sc->sc_sendad_errors < INT_MAX)
1124 sc->sc_sendad_errors++;
1125 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1126 carp_suppress_preempt++;
1127 if (carp_suppress_preempt == 1)
1128 carp_send_ad_all();
1129 }
1130 sc->sc_sendad_success = 0;
1131 } else {
1132 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1133 if (++sc->sc_sendad_success >=
1134 CARP_SENDAD_MIN_SUCCESS) {
1135 carp_suppress_preempt--;
1136 sc->sc_sendad_errors = 0;
1137 }
1138 } else
1139 sc->sc_sendad_errors = 0;
1140 }
1141 }
1142 #endif /* INET */
1143 #ifdef INET6
1144 if (sc->sc_naddrs6) {
1145 struct ip6_hdr *ip6;
1146 struct ifaddr *ifa;
1147 struct ifnet *ifp;
1148 int _s;
1149
1150 MGETHDR(m, M_DONTWAIT, MT_HEADER);
1151 if (m == NULL) {
1152 if_statinc(&sc->sc_if, if_oerrors);
1153 CARP_STATINC(CARP_STAT_ONOMEM);
1154 /* XXX maybe less ? */
1155 goto retry_later;
1156 }
1157 MCLAIM(m, &carp_proto6_mowner_tx);
1158 len = sizeof(*ip6) + sizeof(ch);
1159 m->m_pkthdr.len = len;
1160 m_reset_rcvif(m);
1161 m->m_len = len;
1162 m_align(m, m->m_len);
1163 m->m_flags |= M_MCAST;
1164 ip6 = mtod(m, struct ip6_hdr *);
1165 memset(ip6, 0, sizeof(*ip6));
1166 ip6->ip6_vfc |= IPV6_VERSION;
1167 ip6->ip6_hlim = CARP_DFLTTL;
1168 ip6->ip6_nxt = IPPROTO_CARP;
1169
1170 /* set the source address */
1171 memset(&sa, 0, sizeof(sa));
1172 sa.sa_family = AF_INET6;
1173 _s = pserialize_read_enter();
1174 ifp = sc->sc_carpdev;
1175 ifa = ifaof_ifpforaddr(&sa, ifp);
1176 if (ifa == NULL) { /* This should never happen with IPv6 */
1177 ifp = &sc->sc_if;
1178 ifa = ifaof_ifpforaddr(&sa, ifp);
1179 }
1180 if (ifa == NULL) /* This should never happen with IPv6 */
1181 memset(&ip6->ip6_src, 0, sizeof(struct in6_addr));
1182 else
1183 bcopy(ifatoia6(ifa)->ia_addr.sin6_addr.s6_addr,
1184 &ip6->ip6_src, sizeof(struct in6_addr));
1185 pserialize_read_exit(_s);
1186 /* set the multicast destination */
1187
1188 ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
1189 ip6->ip6_dst.s6_addr8[15] = 0x12;
1190 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) {
1191 if_statinc(&sc->sc_if, if_oerrors);
1192 m_freem(m);
1193 CARP_LOG(sc, ("in6_setscope failed"));
1194 goto retry_later;
1195 }
1196
1197 ch_ptr = (struct carp_header *)(&ip6[1]);
1198 memcpy(ch_ptr, &ch, sizeof(ch));
1199 carp_prepare_ad(m, sc, ch_ptr);
1200
1201 ch_ptr->carp_cksum = carp6_cksum(m, sizeof(*ip6),
1202 len - sizeof(*ip6));
1203
1204 nanotime(&sc->sc_if.if_lastchange);
1205 if_statadd2(&sc->sc_if, if_opackets, 1, if_obytes, len);
1206 CARP_STATINC(CARP_STAT_OPACKETS6);
1207
1208 error = ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL);
1209 if (error) {
1210 if (error == ENOBUFS)
1211 CARP_STATINC(CARP_STAT_ONOMEM);
1212 else
1213 CARP_LOG(sc, ("ip6_output failed: %d", error));
1214 if_statinc(&sc->sc_if, if_oerrors);
1215 if (sc->sc_sendad_errors < INT_MAX)
1216 sc->sc_sendad_errors++;
1217 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1218 carp_suppress_preempt++;
1219 if (carp_suppress_preempt == 1)
1220 carp_send_ad_all();
1221 }
1222 sc->sc_sendad_success = 0;
1223 } else {
1224 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1225 if (++sc->sc_sendad_success >=
1226 CARP_SENDAD_MIN_SUCCESS) {
1227 carp_suppress_preempt--;
1228 sc->sc_sendad_errors = 0;
1229 }
1230 } else
1231 sc->sc_sendad_errors = 0;
1232 }
1233 }
1234 #endif /* INET6 */
1235
1236 retry_later:
1237 splx(s);
1238 KERNEL_UNLOCK_ONE(NULL);
1239 if (advbase != 255 || advskew != 255)
1240 callout_schedule(&sc->sc_ad_tmo, tvtohz(&tv));
1241 }
1242
1243 /*
1244 * Broadcast a gratuitous ARP request containing
1245 * the virtual router MAC address for each IP address
1246 * associated with the virtual router.
1247 */
1248 static void
carp_send_arp(struct carp_softc * sc)1249 carp_send_arp(struct carp_softc *sc)
1250 {
1251 struct ifaddr *ifa;
1252 int s, bound;
1253
1254 KERNEL_LOCK(1, NULL);
1255 bound = curlwp_bind();
1256 s = pserialize_read_enter();
1257 IFADDR_READER_FOREACH(ifa, &sc->sc_if) {
1258 struct psref psref;
1259
1260 if (ifa->ifa_addr->sa_family != AF_INET)
1261 continue;
1262
1263 ifa_acquire(ifa, &psref);
1264 pserialize_read_exit(s);
1265
1266 arpannounce(sc->sc_carpdev, ifa, CLLADDR(sc->sc_if.if_sadl));
1267
1268 s = pserialize_read_enter();
1269 ifa_release(ifa, &psref);
1270 }
1271 pserialize_read_exit(s);
1272 curlwp_bindx(bound);
1273 KERNEL_UNLOCK_ONE(NULL);
1274 }
1275
1276 #ifdef INET6
1277 static void
carp_send_na(struct carp_softc * sc)1278 carp_send_na(struct carp_softc *sc)
1279 {
1280 struct ifaddr *ifa;
1281 struct in6_addr *in6;
1282 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1283 int s, bound;
1284
1285 KERNEL_LOCK(1, NULL);
1286 bound = curlwp_bind();
1287 s = pserialize_read_enter();
1288 IFADDR_READER_FOREACH(ifa, &sc->sc_if) {
1289 struct psref psref;
1290
1291 if (ifa->ifa_addr->sa_family != AF_INET6)
1292 continue;
1293
1294 ifa_acquire(ifa, &psref);
1295 pserialize_read_exit(s);
1296
1297 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
1298 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1299 ND_NA_FLAG_OVERRIDE, 1, NULL);
1300
1301 s = pserialize_read_enter();
1302 ifa_release(ifa, &psref);
1303 }
1304 pserialize_read_exit(s);
1305 curlwp_bindx(bound);
1306 KERNEL_UNLOCK_ONE(NULL);
1307 }
1308 #endif /* INET6 */
1309
1310 /*
1311 * Based on bridge_hash() in if_bridge.c
1312 */
1313 #define mix(a,b,c) \
1314 do { \
1315 a -= b; a -= c; a ^= (c >> 13); \
1316 b -= c; b -= a; b ^= (a << 8); \
1317 c -= a; c -= b; c ^= (b >> 13); \
1318 a -= b; a -= c; a ^= (c >> 12); \
1319 b -= c; b -= a; b ^= (a << 16); \
1320 c -= a; c -= b; c ^= (b >> 5); \
1321 a -= b; a -= c; a ^= (c >> 3); \
1322 b -= c; b -= a; b ^= (a << 10); \
1323 c -= a; c -= b; c ^= (b >> 15); \
1324 } while (0)
1325
1326 static u_int32_t
carp_hash(struct carp_softc * sc,u_char * src)1327 carp_hash(struct carp_softc *sc, u_char *src)
1328 {
1329 u_int32_t a = 0x9e3779b9, b = sc->sc_hashkey[0], c = sc->sc_hashkey[1];
1330
1331 c += sc->sc_key[3] << 24;
1332 c += sc->sc_key[2] << 16;
1333 c += sc->sc_key[1] << 8;
1334 c += sc->sc_key[0];
1335 b += src[5] << 8;
1336 b += src[4];
1337 a += src[3] << 24;
1338 a += src[2] << 16;
1339 a += src[1] << 8;
1340 a += src[0];
1341
1342 mix(a, b, c);
1343 return (c);
1344 }
1345
1346 static int
carp_addrcount(struct carp_if * cif,struct in_ifaddr * ia,int type)1347 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type)
1348 {
1349 struct carp_softc *vh;
1350 struct ifaddr *ifa;
1351 int count = 0;
1352
1353 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1354 if ((type == CARP_COUNT_RUNNING &&
1355 (vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) ==
1356 (IFF_UP|IFF_RUNNING)) ||
1357 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) {
1358 int s = pserialize_read_enter();
1359 IFADDR_READER_FOREACH(ifa, &vh->sc_if) {
1360 if (ifa->ifa_addr->sa_family == AF_INET &&
1361 ia->ia_addr.sin_addr.s_addr ==
1362 ifatoia(ifa)->ia_addr.sin_addr.s_addr)
1363 count++;
1364 }
1365 pserialize_read_exit(s);
1366 }
1367 }
1368 return (count);
1369 }
1370
1371 int
carp_iamatch(struct in_ifaddr * ia,u_char * src,u_int32_t * count,u_int32_t index)1372 carp_iamatch(struct in_ifaddr *ia, u_char *src,
1373 u_int32_t *count, u_int32_t index)
1374 {
1375 struct carp_softc *sc = ia->ia_ifp->if_softc;
1376
1377 if (carp_opts[CARPCTL_ARPBALANCE]) {
1378 /*
1379 * We use the source ip to decide which virtual host should
1380 * handle the request. If we're master of that virtual host,
1381 * then we respond, otherwise, just drop the arp packet on
1382 * the floor.
1383 */
1384
1385 /* Count the elegible carp interfaces with this address */
1386 if (*count == 0)
1387 *count = carp_addrcount(
1388 (struct carp_if *)ia->ia_ifp->if_carpdev->if_carp,
1389 ia, CARP_COUNT_RUNNING);
1390
1391 /* This should never happen, but... */
1392 if (*count == 0)
1393 return (0);
1394
1395 if (carp_hash(sc, src) % *count == index - 1 &&
1396 sc->sc_state == MASTER) {
1397 return (1);
1398 }
1399 } else {
1400 if (sc->sc_state == MASTER)
1401 return (1);
1402 }
1403
1404 return (0);
1405 }
1406
1407 #ifdef INET6
1408 struct ifaddr *
carp_iamatch6(void * v,struct in6_addr * taddr)1409 carp_iamatch6(void *v, struct in6_addr *taddr)
1410 {
1411 struct carp_if *cif = v;
1412 struct carp_softc *vh;
1413 struct ifaddr *ifa;
1414
1415 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1416 int s = pserialize_read_enter();
1417 IFADDR_READER_FOREACH(ifa, &vh->sc_if) {
1418 if (IN6_ARE_ADDR_EQUAL(taddr,
1419 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1420 ((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) ==
1421 (IFF_UP|IFF_RUNNING)) && vh->sc_state == MASTER)
1422 return (ifa);
1423 }
1424 pserialize_read_exit(s);
1425 }
1426
1427 return (NULL);
1428 }
1429 #endif /* INET6 */
1430
1431 struct ifnet *
carp_ourether(void * v,struct ether_header * eh,u_char iftype,int src)1432 carp_ourether(void *v, struct ether_header *eh, u_char iftype, int src)
1433 {
1434 struct carp_if *cif = (struct carp_if *)v;
1435 struct carp_softc *vh;
1436 u_int8_t *ena;
1437
1438 if (src)
1439 ena = (u_int8_t *)&eh->ether_shost;
1440 else
1441 ena = (u_int8_t *)&eh->ether_dhost;
1442
1443 switch (iftype) {
1444 case IFT_ETHER:
1445 case IFT_FDDI:
1446 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
1447 return (NULL);
1448 break;
1449 case IFT_ISO88025:
1450 if (ena[0] != 3 || ena[1] || ena[4] || ena[5])
1451 return (NULL);
1452 break;
1453 default:
1454 return (NULL);
1455 break;
1456 }
1457
1458 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list)
1459 if ((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) ==
1460 (IFF_UP|IFF_RUNNING) && vh->sc_state == MASTER &&
1461 !memcmp(ena, CLLADDR(vh->sc_if.if_sadl),
1462 ETHER_ADDR_LEN)) {
1463 return (&vh->sc_if);
1464 }
1465
1466 return (NULL);
1467 }
1468
1469 int
carp_input(struct mbuf * m,u_int8_t * shost,u_int8_t * dhost,u_int16_t etype)1470 carp_input(struct mbuf *m, u_int8_t *shost, u_int8_t *dhost, u_int16_t etype)
1471 {
1472 struct ether_header eh;
1473 struct carp_if *cif = (struct carp_if *)m_get_rcvif_NOMPSAFE(m)->if_carp;
1474 struct ifnet *ifp;
1475
1476 memcpy(&eh.ether_shost, shost, sizeof(eh.ether_shost));
1477 memcpy(&eh.ether_dhost, dhost, sizeof(eh.ether_dhost));
1478 eh.ether_type = etype;
1479
1480 if (m->m_flags & (M_BCAST|M_MCAST)) {
1481 struct carp_softc *vh;
1482 struct mbuf *m0;
1483
1484 /*
1485 * XXX Should really check the list of multicast addresses
1486 * for each CARP interface _before_ copying.
1487 */
1488 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1489 m0 = m_copym(m, 0, M_COPYALL, M_DONTWAIT);
1490 if (m0 == NULL)
1491 continue;
1492 m_set_rcvif(m0, &vh->sc_if);
1493 ether_input(&vh->sc_if, m0);
1494 }
1495 return (1);
1496 }
1497
1498 ifp = carp_ourether(cif, &eh, m_get_rcvif_NOMPSAFE(m)->if_type, 0);
1499 if (ifp == NULL) {
1500 return (1);
1501 }
1502
1503 m_set_rcvif(m, ifp);
1504
1505 bpf_mtap(ifp, m, BPF_D_IN);
1506 if_statinc(ifp, if_ipackets);
1507 ether_input(ifp, m);
1508 return (0);
1509 }
1510
1511 static void
carp_master_down(void * v)1512 carp_master_down(void *v)
1513 {
1514 struct carp_softc *sc = v;
1515
1516 switch (sc->sc_state) {
1517 case INIT:
1518 printf("%s: master_down event in INIT state\n",
1519 sc->sc_if.if_xname);
1520 break;
1521 case MASTER:
1522 break;
1523 case BACKUP:
1524 CARP_LOG(sc, ("INIT -> MASTER (preempting)"));
1525 carp_set_state(sc, MASTER);
1526 carp_send_ad(sc);
1527 carp_send_arp(sc);
1528 #ifdef INET6
1529 carp_send_na(sc);
1530 #endif /* INET6 */
1531 carp_setrun(sc, 0);
1532 carp_setroute(sc, RTM_ADD);
1533 break;
1534 }
1535 }
1536
1537 /*
1538 * When in backup state, af indicates whether to reset the master down timer
1539 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1540 */
1541 static void
carp_setrun(struct carp_softc * sc,sa_family_t af)1542 carp_setrun(struct carp_softc *sc, sa_family_t af)
1543 {
1544 struct timeval tv;
1545
1546 if (sc->sc_carpdev == NULL) {
1547 sc->sc_if.if_flags &= ~IFF_RUNNING;
1548 carp_set_state(sc, INIT);
1549 return;
1550 }
1551
1552 if (sc->sc_if.if_flags & IFF_UP && sc->sc_vhid > 0 &&
1553 (sc->sc_naddrs || sc->sc_naddrs6) && !sc->sc_suppress) {
1554 sc->sc_if.if_flags |= IFF_RUNNING;
1555 } else {
1556 sc->sc_if.if_flags &= ~IFF_RUNNING;
1557 carp_setroute(sc, RTM_DELETE);
1558 return;
1559 }
1560
1561 switch (sc->sc_state) {
1562 case INIT:
1563 carp_set_state(sc, BACKUP);
1564 carp_setroute(sc, RTM_DELETE);
1565 carp_setrun(sc, 0);
1566 break;
1567 case BACKUP:
1568 callout_stop(&sc->sc_ad_tmo);
1569 tv.tv_sec = 3 * sc->sc_advbase;
1570 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1571 switch (af) {
1572 #ifdef INET
1573 case AF_INET:
1574 callout_schedule(&sc->sc_md_tmo, tvtohz(&tv));
1575 break;
1576 #endif /* INET */
1577 #ifdef INET6
1578 case AF_INET6:
1579 callout_schedule(&sc->sc_md6_tmo, tvtohz(&tv));
1580 break;
1581 #endif /* INET6 */
1582 default:
1583 if (sc->sc_naddrs)
1584 callout_schedule(&sc->sc_md_tmo, tvtohz(&tv));
1585 #ifdef INET6
1586 if (sc->sc_naddrs6)
1587 callout_schedule(&sc->sc_md6_tmo, tvtohz(&tv));
1588 #endif /* INET6 */
1589 break;
1590 }
1591 break;
1592 case MASTER:
1593 tv.tv_sec = sc->sc_advbase;
1594 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1595 callout_schedule(&sc->sc_ad_tmo, tvtohz(&tv));
1596 break;
1597 }
1598 }
1599
1600 static void
carp_multicast_cleanup(struct carp_softc * sc)1601 carp_multicast_cleanup(struct carp_softc *sc)
1602 {
1603 struct ip_moptions *imo = &sc->sc_imo;
1604 #ifdef INET6
1605 struct ip6_moptions *im6o = &sc->sc_im6o;
1606 #endif
1607 u_int16_t n = imo->imo_num_memberships;
1608
1609 /* Clean up our own multicast memberships */
1610 while (n-- > 0) {
1611 if (imo->imo_membership[n] != NULL) {
1612 in_delmulti(imo->imo_membership[n]);
1613 imo->imo_membership[n] = NULL;
1614 }
1615 }
1616 imo->imo_num_memberships = 0;
1617 imo->imo_multicast_if_index = 0;
1618
1619 #ifdef INET6
1620 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1621 struct in6_multi_mship *imm =
1622 LIST_FIRST(&im6o->im6o_memberships);
1623
1624 LIST_REMOVE(imm, i6mm_chain);
1625 in6_leavegroup(imm);
1626 }
1627 im6o->im6o_multicast_if_index = 0;
1628 #endif
1629
1630 /* And any other multicast memberships */
1631 carp_ether_purgemulti(sc);
1632 }
1633
1634 static int
carp_set_ifp(struct carp_softc * sc,struct ifnet * ifp)1635 carp_set_ifp(struct carp_softc *sc, struct ifnet *ifp)
1636 {
1637 struct carp_if *cif, *ncif = NULL;
1638 struct carp_softc *vr, *after = NULL;
1639 int myself = 0, error = 0;
1640 int s;
1641
1642 if (ifp == sc->sc_carpdev)
1643 return (0);
1644
1645 if (ifp != NULL) {
1646 if ((ifp->if_flags & IFF_MULTICAST) == 0)
1647 return (EADDRNOTAVAIL);
1648
1649 if (ifp->if_type == IFT_CARP)
1650 return (EINVAL);
1651
1652 if (ifp->if_carp == NULL) {
1653 ncif = malloc(sizeof(*cif), M_IFADDR, M_WAITOK);
1654 if ((error = ifpromisc(ifp, 1))) {
1655 free(ncif, M_IFADDR);
1656 return (error);
1657 }
1658
1659 ncif->vhif_ifp = ifp;
1660 TAILQ_INIT(&ncif->vhif_vrs);
1661 } else {
1662 cif = (struct carp_if *)ifp->if_carp;
1663 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1664 if (vr != sc && vr->sc_vhid == sc->sc_vhid)
1665 return (EINVAL);
1666 }
1667
1668 /* detach from old interface */
1669 if (sc->sc_carpdev != NULL)
1670 carpdetach(sc);
1671
1672 /* join multicast groups */
1673 if (sc->sc_naddrs < 0 &&
1674 (error = carp_join_multicast(sc)) != 0) {
1675 if (ncif != NULL)
1676 free(ncif, M_IFADDR);
1677 return (error);
1678 }
1679
1680 #ifdef INET6
1681 if (sc->sc_naddrs6 < 0 &&
1682 (error = carp_join_multicast6(sc)) != 0) {
1683 if (ncif != NULL)
1684 free(ncif, M_IFADDR);
1685 carp_multicast_cleanup(sc);
1686 return (error);
1687 }
1688 #endif
1689
1690 /* attach carp interface to physical interface */
1691 if (ncif != NULL)
1692 ifp->if_carp = (void *)ncif;
1693 sc->sc_carpdev = ifp;
1694 sc->sc_if.if_capabilities = ifp->if_capabilities &
1695 (IFCAP_TSOv4 | IFCAP_TSOv6 |
1696 IFCAP_CSUM_IPv4_Tx|IFCAP_CSUM_IPv4_Rx|
1697 IFCAP_CSUM_TCPv4_Tx|IFCAP_CSUM_TCPv4_Rx|
1698 IFCAP_CSUM_UDPv4_Tx|IFCAP_CSUM_UDPv4_Rx|
1699 IFCAP_CSUM_TCPv6_Tx|IFCAP_CSUM_TCPv6_Rx|
1700 IFCAP_CSUM_UDPv6_Tx|IFCAP_CSUM_UDPv6_Rx);
1701
1702 cif = (struct carp_if *)ifp->if_carp;
1703 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1704 if (vr == sc)
1705 myself = 1;
1706 if (vr->sc_vhid < sc->sc_vhid)
1707 after = vr;
1708 }
1709
1710 if (!myself) {
1711 /* We're trying to keep things in order */
1712 if (after == NULL) {
1713 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1714 } else {
1715 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after,
1716 sc, sc_list);
1717 }
1718 cif->vhif_nvrs++;
1719 }
1720 if (sc->sc_naddrs || sc->sc_naddrs6)
1721 sc->sc_if.if_flags |= IFF_UP;
1722 carp_set_enaddr(sc);
1723 sc->sc_linkstate_hook = if_linkstate_change_establish(ifp,
1724 carp_carpdev_state, (void *)ifp);
1725 KERNEL_LOCK(1, NULL);
1726 s = splnet();
1727 carp_carpdev_state(ifp);
1728 splx(s);
1729 KERNEL_UNLOCK_ONE(NULL);
1730 } else {
1731 carpdetach(sc);
1732 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
1733 }
1734 return (0);
1735 }
1736
1737 static void
carp_set_enaddr(struct carp_softc * sc)1738 carp_set_enaddr(struct carp_softc *sc)
1739 {
1740 struct ifnet *ifp = &sc->sc_if;
1741 uint8_t enaddr[ETHER_ADDR_LEN];
1742
1743 if (sc->sc_vhid == -1) {
1744 ifp->if_addrlen = 0;
1745 if_alloc_sadl(ifp);
1746 return;
1747 }
1748
1749 if (sc->sc_carpdev && sc->sc_carpdev->if_type == IFT_ISO88025) {
1750 enaddr[0] = 3;
1751 enaddr[1] = 0;
1752 enaddr[2] = 0x40 >> (sc->sc_vhid - 1);
1753 enaddr[3] = 0x40000 >> (sc->sc_vhid - 1);
1754 enaddr[4] = 0;
1755 enaddr[5] = 0;
1756 } else {
1757 enaddr[0] = 0;
1758 enaddr[1] = 0;
1759 enaddr[2] = 0x5e;
1760 enaddr[3] = 0;
1761 enaddr[4] = 1;
1762 enaddr[5] = sc->sc_vhid;
1763 }
1764
1765 if_set_sadl(ifp, enaddr, sizeof(enaddr), false);
1766 }
1767
1768 #if 0
1769 static void
1770 carp_addr_updated(void *v)
1771 {
1772 struct carp_softc *sc = (struct carp_softc *) v;
1773 struct ifaddr *ifa;
1774 int new_naddrs = 0, new_naddrs6 = 0;
1775
1776 IFADDR_READER_FOREACH(ifa, &sc->sc_if) {
1777 if (ifa->ifa_addr->sa_family == AF_INET)
1778 new_naddrs++;
1779 else if (ifa->ifa_addr->sa_family == AF_INET6)
1780 new_naddrs6++;
1781 }
1782
1783 /* Handle a callback after SIOCDIFADDR */
1784 if (new_naddrs < sc->sc_naddrs || new_naddrs6 < sc->sc_naddrs6) {
1785 struct in_addr mc_addr;
1786
1787 sc->sc_naddrs = new_naddrs;
1788 sc->sc_naddrs6 = new_naddrs6;
1789
1790 /* Re-establish multicast membership removed by in_control */
1791 mc_addr.s_addr = INADDR_CARP_GROUP;
1792 if (!in_multi_group(mc_addr, &sc->sc_if, 0)) {
1793 memset(&sc->sc_imo, 0, sizeof(sc->sc_imo));
1794
1795 if (sc->sc_carpdev != NULL && sc->sc_naddrs > 0)
1796 carp_join_multicast(sc);
1797 }
1798
1799 if (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0) {
1800 sc->sc_if.if_flags &= ~IFF_UP;
1801 carp_set_state(sc, INIT);
1802 } else
1803 carp_hmac_prepare(sc);
1804 }
1805
1806 carp_setrun(sc, 0);
1807 }
1808 #endif
1809
1810 static int
carp_set_addr(struct carp_softc * sc,struct sockaddr_in * sin)1811 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1812 {
1813 struct ifnet *ifp = sc->sc_carpdev;
1814 struct in_ifaddr *ia, *ia_if;
1815 int error = 0;
1816 int s;
1817
1818 if (sin->sin_addr.s_addr == 0) {
1819 if (!(sc->sc_if.if_flags & IFF_UP))
1820 carp_set_state(sc, INIT);
1821 if (sc->sc_naddrs)
1822 sc->sc_if.if_flags |= IFF_UP;
1823 carp_setrun(sc, 0);
1824 return (0);
1825 }
1826
1827 /* we have to do this by hand to ensure we don't match on ourselves */
1828 ia_if = NULL;
1829 s = pserialize_read_enter();
1830 IN_ADDRLIST_READER_FOREACH(ia) {
1831 /* and, yeah, we need a multicast-capable iface too */
1832 if (ia->ia_ifp != &sc->sc_if &&
1833 ia->ia_ifp->if_type != IFT_CARP &&
1834 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1835 (sin->sin_addr.s_addr & ia->ia_subnetmask) ==
1836 ia->ia_subnet) {
1837 if (!ia_if)
1838 ia_if = ia;
1839 }
1840 }
1841
1842 if (ia_if) {
1843 ia = ia_if;
1844 if (ifp) {
1845 if (ifp != ia->ia_ifp)
1846 return (EADDRNOTAVAIL);
1847 } else {
1848 /* FIXME NOMPSAFE */
1849 ifp = ia->ia_ifp;
1850 }
1851 }
1852 pserialize_read_exit(s);
1853
1854 if ((error = carp_set_ifp(sc, ifp)))
1855 return (error);
1856
1857 if (sc->sc_carpdev == NULL)
1858 return (EADDRNOTAVAIL);
1859
1860 if (sc->sc_naddrs == 0 && (error = carp_join_multicast(sc)) != 0)
1861 return (error);
1862
1863 sc->sc_naddrs++;
1864 if (sc->sc_carpdev != NULL)
1865 sc->sc_if.if_flags |= IFF_UP;
1866
1867 carp_set_state(sc, INIT);
1868 carp_setrun(sc, 0);
1869
1870 /*
1871 * Hook if_addrhooks so that we get a callback after in_ifinit has run,
1872 * to correct any inappropriate routes that it inserted.
1873 */
1874 if (sc->ah_cookie == 0) {
1875 /* XXX link address hook */
1876 }
1877
1878 return (0);
1879 }
1880
1881 static int
carp_join_multicast(struct carp_softc * sc)1882 carp_join_multicast(struct carp_softc *sc)
1883 {
1884 struct ip_moptions *imo = &sc->sc_imo, tmpimo;
1885 struct in_addr addr;
1886
1887 if (sc->sc_carpdev == NULL)
1888 return (ENETDOWN);
1889
1890 memset(&tmpimo, 0, sizeof(tmpimo));
1891 addr.s_addr = INADDR_CARP_GROUP;
1892 if ((tmpimo.imo_membership[0] =
1893 in_addmulti(&addr, &sc->sc_if)) == NULL) {
1894 return (ENOBUFS);
1895 }
1896
1897 imo->imo_membership[0] = tmpimo.imo_membership[0];
1898 imo->imo_num_memberships = 1;
1899 imo->imo_multicast_if_index = sc->sc_carpdev->if_index;
1900 imo->imo_multicast_ttl = CARP_DFLTTL;
1901 imo->imo_multicast_loop = 0;
1902 return (0);
1903 }
1904
1905
1906 #ifdef INET6
1907 static int
carp_set_addr6(struct carp_softc * sc,struct sockaddr_in6 * sin6)1908 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1909 {
1910 struct ifnet *ifp = sc->sc_carpdev;
1911 struct in6_ifaddr *ia, *ia_if;
1912 int error = 0;
1913 int s;
1914
1915 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1916 if (!(sc->sc_if.if_flags & IFF_UP))
1917 carp_set_state(sc, INIT);
1918 if (sc->sc_naddrs6)
1919 sc->sc_if.if_flags |= IFF_UP;
1920 carp_setrun(sc, 0);
1921 return (0);
1922 }
1923
1924 /* we have to do this by hand to ensure we don't match on ourselves */
1925 ia_if = NULL;
1926 s = pserialize_read_enter();
1927 IN6_ADDRLIST_READER_FOREACH(ia) {
1928 int i;
1929
1930 for (i = 0; i < 4; i++) {
1931 if ((sin6->sin6_addr.s6_addr32[i] &
1932 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
1933 (ia->ia_addr.sin6_addr.s6_addr32[i] &
1934 ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
1935 break;
1936 }
1937 /* and, yeah, we need a multicast-capable iface too */
1938 if (ia->ia_ifp != &sc->sc_if &&
1939 ia->ia_ifp->if_type != IFT_CARP &&
1940 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1941 (i == 4)) {
1942 if (!ia_if)
1943 ia_if = ia;
1944 }
1945 }
1946 pserialize_read_exit(s);
1947
1948 if (ia_if) {
1949 ia = ia_if;
1950 if (sc->sc_carpdev) {
1951 if (sc->sc_carpdev != ia->ia_ifp)
1952 return (EADDRNOTAVAIL);
1953 } else {
1954 ifp = ia->ia_ifp;
1955 }
1956 }
1957
1958 if ((error = carp_set_ifp(sc, ifp)))
1959 return (error);
1960
1961 if (sc->sc_carpdev == NULL)
1962 return (EADDRNOTAVAIL);
1963
1964 if (sc->sc_naddrs6 == 0 && (error = carp_join_multicast6(sc)) != 0)
1965 return (error);
1966
1967 sc->sc_naddrs6++;
1968 if (sc->sc_carpdev != NULL)
1969 sc->sc_if.if_flags |= IFF_UP;
1970 carp_set_state(sc, INIT);
1971 carp_setrun(sc, 0);
1972
1973 return (0);
1974 }
1975
1976 static int
carp_join_multicast6(struct carp_softc * sc)1977 carp_join_multicast6(struct carp_softc *sc)
1978 {
1979 struct in6_multi_mship *imm, *imm2;
1980 struct ip6_moptions *im6o = &sc->sc_im6o;
1981 struct sockaddr_in6 addr6;
1982 int error;
1983
1984 if (sc->sc_carpdev == NULL)
1985 return (ENETDOWN);
1986
1987 /* Join IPv6 CARP multicast group */
1988 memset(&addr6, 0, sizeof(addr6));
1989 addr6.sin6_family = AF_INET6;
1990 addr6.sin6_len = sizeof(addr6);
1991 addr6.sin6_addr.s6_addr16[0] = htons(0xff02);
1992 addr6.sin6_addr.s6_addr16[1] = htons(sc->sc_if.if_index);
1993 addr6.sin6_addr.s6_addr8[15] = 0x12;
1994 if ((imm = in6_joingroup(&sc->sc_if,
1995 &addr6.sin6_addr, &error, 0)) == NULL) {
1996 return (error);
1997 }
1998 /* join solicited multicast address */
1999 memset(&addr6.sin6_addr, 0, sizeof(addr6.sin6_addr));
2000 addr6.sin6_addr.s6_addr16[0] = htons(0xff02);
2001 addr6.sin6_addr.s6_addr16[1] = htons(sc->sc_if.if_index);
2002 addr6.sin6_addr.s6_addr32[1] = 0;
2003 addr6.sin6_addr.s6_addr32[2] = htonl(1);
2004 addr6.sin6_addr.s6_addr32[3] = 0;
2005 addr6.sin6_addr.s6_addr8[12] = 0xff;
2006 if ((imm2 = in6_joingroup(&sc->sc_if,
2007 &addr6.sin6_addr, &error, 0)) == NULL) {
2008 in6_leavegroup(imm);
2009 return (error);
2010 }
2011
2012 /* apply v6 multicast membership */
2013 im6o->im6o_multicast_if_index = sc->sc_carpdev->if_index;
2014 if (imm)
2015 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm,
2016 i6mm_chain);
2017 if (imm2)
2018 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm2,
2019 i6mm_chain);
2020
2021 return (0);
2022 }
2023
2024 #endif /* INET6 */
2025
2026 static int
carp_ioctl(struct ifnet * ifp,u_long cmd,void * data)2027 carp_ioctl(struct ifnet *ifp, u_long cmd, void *data)
2028 {
2029 struct lwp *l = curlwp; /* XXX */
2030 struct carp_softc *sc = ifp->if_softc, *vr;
2031 struct carpreq carpr;
2032 struct ifaddr *ifa;
2033 struct ifreq *ifr;
2034 struct ifnet *cdev = NULL;
2035 int error = 0;
2036
2037 ifa = (struct ifaddr *)data;
2038 ifr = (struct ifreq *)data;
2039
2040 switch (cmd) {
2041 case SIOCINITIFADDR:
2042 switch (ifa->ifa_addr->sa_family) {
2043 #ifdef INET
2044 case AF_INET:
2045 sc->sc_if.if_flags |= IFF_UP;
2046 memcpy(ifa->ifa_dstaddr, ifa->ifa_addr,
2047 sizeof(struct sockaddr));
2048 error = carp_set_addr(sc, satosin(ifa->ifa_addr));
2049 break;
2050 #endif /* INET */
2051 #ifdef INET6
2052 case AF_INET6:
2053 sc->sc_if.if_flags|= IFF_UP;
2054 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr));
2055 break;
2056 #endif /* INET6 */
2057 default:
2058 error = EAFNOSUPPORT;
2059 break;
2060 }
2061 break;
2062
2063 case SIOCSIFFLAGS:
2064 if ((error = ifioctl_common(ifp, cmd, data)) != 0)
2065 break;
2066 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) {
2067 callout_stop(&sc->sc_ad_tmo);
2068 callout_stop(&sc->sc_md_tmo);
2069 callout_stop(&sc->sc_md6_tmo);
2070 if (sc->sc_state == MASTER) {
2071 /* we need the interface up to bow out */
2072 sc->sc_if.if_flags |= IFF_UP;
2073 sc->sc_bow_out = 1;
2074 carp_send_ad(sc);
2075 }
2076 sc->sc_if.if_flags &= ~IFF_UP;
2077 carp_set_state(sc, INIT);
2078 carp_setrun(sc, 0);
2079 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) {
2080 sc->sc_if.if_flags |= IFF_UP;
2081 carp_setrun(sc, 0);
2082 }
2083 carp_update_link_state(sc);
2084 break;
2085
2086 case SIOCSVH:
2087 if (l == NULL)
2088 break;
2089 if ((error = kauth_authorize_network(l->l_cred,
2090 KAUTH_NETWORK_INTERFACE,
2091 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd,
2092 NULL)) != 0)
2093 break;
2094 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr)))
2095 break;
2096 error = 1;
2097 if (carpr.carpr_carpdev[0] != '\0' &&
2098 (cdev = ifunit(carpr.carpr_carpdev)) == NULL)
2099 return (EINVAL);
2100 if ((error = carp_set_ifp(sc, cdev)))
2101 return (error);
2102 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) {
2103 switch (carpr.carpr_state) {
2104 case BACKUP:
2105 callout_stop(&sc->sc_ad_tmo);
2106 carp_set_state(sc, BACKUP);
2107 carp_setrun(sc, 0);
2108 carp_setroute(sc, RTM_DELETE);
2109 break;
2110 case MASTER:
2111 carp_master_down(sc);
2112 break;
2113 default:
2114 break;
2115 }
2116 }
2117 if (carpr.carpr_vhid > 0) {
2118 if (carpr.carpr_vhid > 255) {
2119 error = EINVAL;
2120 break;
2121 }
2122 if (sc->sc_carpdev) {
2123 struct carp_if *cif;
2124 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
2125 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
2126 if (vr != sc &&
2127 vr->sc_vhid == carpr.carpr_vhid)
2128 return (EINVAL);
2129 }
2130 sc->sc_vhid = carpr.carpr_vhid;
2131 carp_set_enaddr(sc);
2132 carp_set_state(sc, INIT);
2133 error--;
2134 }
2135 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) {
2136 if (carpr.carpr_advskew > 254) {
2137 error = EINVAL;
2138 break;
2139 }
2140 if (carpr.carpr_advbase > 255) {
2141 error = EINVAL;
2142 break;
2143 }
2144 sc->sc_advbase = carpr.carpr_advbase;
2145 sc->sc_advskew = carpr.carpr_advskew;
2146 error--;
2147 }
2148 memcpy(sc->sc_key, carpr.carpr_key, sizeof(sc->sc_key));
2149 if (error > 0)
2150 error = EINVAL;
2151 else {
2152 error = 0;
2153 carp_setrun(sc, 0);
2154 }
2155 break;
2156
2157 case SIOCGVH:
2158 memset(&carpr, 0, sizeof(carpr));
2159 if (sc->sc_carpdev != NULL)
2160 strlcpy(carpr.carpr_carpdev, sc->sc_carpdev->if_xname,
2161 IFNAMSIZ);
2162 carpr.carpr_state = sc->sc_state;
2163 carpr.carpr_vhid = sc->sc_vhid;
2164 carpr.carpr_advbase = sc->sc_advbase;
2165 carpr.carpr_advskew = sc->sc_advskew;
2166
2167 if ((l != NULL) && (error = kauth_authorize_network(l->l_cred,
2168 KAUTH_NETWORK_INTERFACE,
2169 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd,
2170 NULL)) == 0)
2171 memcpy(carpr.carpr_key, sc->sc_key,
2172 sizeof(carpr.carpr_key));
2173 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
2174 break;
2175
2176 case SIOCADDMULTI:
2177 error = carp_ether_addmulti(sc, ifr);
2178 break;
2179
2180 case SIOCDELMULTI:
2181 error = carp_ether_delmulti(sc, ifr);
2182 break;
2183
2184 case SIOCSIFCAP:
2185 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET)
2186 error = 0;
2187 break;
2188
2189 default:
2190 error = ether_ioctl(ifp, cmd, data);
2191 }
2192
2193 carp_hmac_prepare(sc);
2194 return (error);
2195 }
2196
2197
2198 /*
2199 * Start output on carp interface. This function should never be called.
2200 */
2201 static void
carp_start(struct ifnet * ifp)2202 carp_start(struct ifnet *ifp)
2203 {
2204 #ifdef DEBUG
2205 printf("%s: start called\n", ifp->if_xname);
2206 #endif
2207 }
2208
2209 int
carp_output(struct ifnet * ifp,struct mbuf * m,const struct sockaddr * sa,const struct rtentry * rt)2210 carp_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa,
2211 const struct rtentry *rt)
2212 {
2213 struct carp_softc *sc = ((struct carp_softc *)ifp->if_softc);
2214 KASSERT(KERNEL_LOCKED_P());
2215
2216 if (sc->sc_carpdev != NULL && sc->sc_state == MASTER) {
2217 return if_output_lock(sc->sc_carpdev, ifp, m, sa, rt);
2218 } else {
2219 m_freem(m);
2220 return (ENETUNREACH);
2221 }
2222 }
2223
2224 static void
carp_set_state(struct carp_softc * sc,int state)2225 carp_set_state(struct carp_softc *sc, int state)
2226 {
2227 static const char *carp_states[] = { CARP_STATES };
2228
2229 if (sc->sc_state == state)
2230 return;
2231
2232 CARP_LOG(sc, ("state transition from: %s -> to: %s", carp_states[sc->sc_state], carp_states[state]));
2233
2234 sc->sc_state = state;
2235 carp_update_link_state(sc);
2236 }
2237
2238 static void
carp_update_link_state(struct carp_softc * sc)2239 carp_update_link_state(struct carp_softc *sc)
2240 {
2241 int link_state;
2242
2243 switch (sc->sc_state) {
2244 case BACKUP:
2245 link_state = LINK_STATE_DOWN;
2246 break;
2247 case MASTER:
2248 link_state = LINK_STATE_UP;
2249 break;
2250 default:
2251 /* Not useable, so down makes perfect sense. */
2252 link_state = LINK_STATE_DOWN;
2253 break;
2254 }
2255 if_link_state_change(&sc->sc_if, link_state);
2256 }
2257
2258 void
carp_carpdev_state(void * v)2259 carp_carpdev_state(void *v)
2260 {
2261 struct carp_if *cif;
2262 struct carp_softc *sc;
2263 struct ifnet *ifp = v;
2264
2265 if (ifp->if_type == IFT_CARP)
2266 return;
2267
2268 cif = (struct carp_if *)ifp->if_carp;
2269
2270 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
2271 int suppressed = sc->sc_suppress;
2272
2273 if (sc->sc_carpdev->if_link_state == LINK_STATE_DOWN ||
2274 !(sc->sc_carpdev->if_flags & IFF_UP)) {
2275 sc->sc_if.if_flags &= ~IFF_RUNNING;
2276 callout_stop(&sc->sc_ad_tmo);
2277 callout_stop(&sc->sc_md_tmo);
2278 callout_stop(&sc->sc_md6_tmo);
2279 carp_set_state(sc, INIT);
2280 sc->sc_suppress = 1;
2281 carp_setrun(sc, 0);
2282 if (!suppressed) {
2283 carp_suppress_preempt++;
2284 if (carp_suppress_preempt == 1)
2285 carp_send_ad_all();
2286 }
2287 } else {
2288 carp_set_state(sc, INIT);
2289 sc->sc_suppress = 0;
2290 carp_setrun(sc, 0);
2291 if (suppressed)
2292 carp_suppress_preempt--;
2293 }
2294 }
2295 }
2296
2297 static int
carp_ether_addmulti(struct carp_softc * sc,struct ifreq * ifr)2298 carp_ether_addmulti(struct carp_softc *sc, struct ifreq *ifr)
2299 {
2300 const struct sockaddr *sa = ifreq_getaddr(SIOCADDMULTI, ifr);
2301 struct ifnet *ifp;
2302 struct carp_mc_entry *mc;
2303 u_int8_t addrlo[ETHER_ADDR_LEN], addrhi[ETHER_ADDR_LEN];
2304 int error;
2305
2306 ifp = sc->sc_carpdev;
2307 if (ifp == NULL)
2308 return (EINVAL);
2309
2310 error = ether_addmulti(sa, &sc->sc_ac);
2311 if (error != ENETRESET)
2312 return (error);
2313
2314 /*
2315 * This is new multicast address. We have to tell parent
2316 * about it. Also, remember this multicast address so that
2317 * we can delete them on unconfigure.
2318 */
2319 mc = malloc(sizeof(struct carp_mc_entry), M_DEVBUF, M_NOWAIT);
2320 if (mc == NULL) {
2321 error = ENOMEM;
2322 goto alloc_failed;
2323 }
2324
2325 /*
2326 * As ether_addmulti() returns ENETRESET, following two
2327 * statement shouldn't fail.
2328 */
2329 (void)ether_multiaddr(sa, addrlo, addrhi);
2330
2331 ETHER_LOCK(&sc->sc_ac);
2332 mc->mc_enm = ether_lookup_multi(addrlo, addrhi, &sc->sc_ac);
2333 ETHER_UNLOCK(&sc->sc_ac);
2334
2335 memcpy(&mc->mc_addr, sa, sa->sa_len);
2336 LIST_INSERT_HEAD(&sc->carp_mc_listhead, mc, mc_entries);
2337
2338 error = if_mcast_op(ifp, SIOCADDMULTI, sa);
2339 if (error != 0)
2340 goto ioctl_failed;
2341
2342 return (error);
2343
2344 ioctl_failed:
2345 LIST_REMOVE(mc, mc_entries);
2346 free(mc, M_DEVBUF);
2347 alloc_failed:
2348 (void)ether_delmulti(sa, &sc->sc_ac);
2349
2350 return (error);
2351 }
2352
2353 static int
carp_ether_delmulti(struct carp_softc * sc,struct ifreq * ifr)2354 carp_ether_delmulti(struct carp_softc *sc, struct ifreq *ifr)
2355 {
2356 const struct sockaddr *sa = ifreq_getaddr(SIOCDELMULTI, ifr);
2357 struct ifnet *ifp;
2358 struct ether_multi *enm;
2359 struct carp_mc_entry *mc;
2360 u_int8_t addrlo[ETHER_ADDR_LEN], addrhi[ETHER_ADDR_LEN];
2361 int error;
2362
2363 ifp = sc->sc_carpdev;
2364 if (ifp == NULL)
2365 return (EINVAL);
2366
2367 /*
2368 * Find a key to lookup carp_mc_entry. We have to do this
2369 * before calling ether_delmulti for obvious reason.
2370 */
2371 if ((error = ether_multiaddr(sa, addrlo, addrhi)) != 0)
2372 return (error);
2373
2374 ETHER_LOCK(&sc->sc_ac);
2375 enm = ether_lookup_multi(addrlo, addrhi, &sc->sc_ac);
2376 ETHER_UNLOCK(&sc->sc_ac);
2377 if (enm == NULL)
2378 return (EINVAL);
2379
2380 LIST_FOREACH(mc, &sc->carp_mc_listhead, mc_entries)
2381 if (mc->mc_enm == enm)
2382 break;
2383
2384 /* We won't delete entries we didn't add */
2385 if (mc == NULL)
2386 return (EINVAL);
2387
2388 error = ether_delmulti(sa, &sc->sc_ac);
2389 if (error != ENETRESET)
2390 return (error);
2391
2392 /* We no longer use this multicast address. Tell parent so. */
2393 error = if_mcast_op(ifp, SIOCDELMULTI, sa);
2394 if (error == 0) {
2395 /* And forget about this address. */
2396 LIST_REMOVE(mc, mc_entries);
2397 free(mc, M_DEVBUF);
2398 } else
2399 (void)ether_addmulti(sa, &sc->sc_ac);
2400 return (error);
2401 }
2402
2403 /*
2404 * Delete any multicast address we have asked to add from parent
2405 * interface. Called when the carp is being unconfigured.
2406 */
2407 static void
carp_ether_purgemulti(struct carp_softc * sc)2408 carp_ether_purgemulti(struct carp_softc *sc)
2409 {
2410 struct ifnet *ifp = sc->sc_carpdev; /* Parent. */
2411 struct carp_mc_entry *mc;
2412
2413 if (ifp == NULL)
2414 return;
2415
2416 while ((mc = LIST_FIRST(&sc->carp_mc_listhead)) != NULL) {
2417 (void)if_mcast_op(ifp, SIOCDELMULTI, sstosa(&mc->mc_addr));
2418 LIST_REMOVE(mc, mc_entries);
2419 free(mc, M_DEVBUF);
2420 }
2421 }
2422
2423 static int
sysctl_net_inet_carp_stats(SYSCTLFN_ARGS)2424 sysctl_net_inet_carp_stats(SYSCTLFN_ARGS)
2425 {
2426
2427 return (NETSTAT_SYSCTL(carpstat_percpu, CARP_NSTATS));
2428 }
2429
2430 void
carp_init(void)2431 carp_init(void)
2432 {
2433
2434 sysctl_net_inet_carp_setup(NULL);
2435 #ifdef MBUFTRACE
2436 MOWNER_ATTACH(&carp_proto_mowner_rx);
2437 MOWNER_ATTACH(&carp_proto_mowner_tx);
2438 MOWNER_ATTACH(&carp_proto6_mowner_rx);
2439 MOWNER_ATTACH(&carp_proto6_mowner_tx);
2440 #endif
2441
2442 carp_wqinput = wqinput_create("carp", _carp_proto_input);
2443 #ifdef INET6
2444 carp6_wqinput = wqinput_create("carp6", _carp6_proto_input);
2445 #endif
2446 }
2447
2448 static void
sysctl_net_inet_carp_setup(struct sysctllog ** clog)2449 sysctl_net_inet_carp_setup(struct sysctllog **clog)
2450 {
2451
2452 sysctl_createv(clog, 0, NULL, NULL,
2453 CTLFLAG_PERMANENT,
2454 CTLTYPE_NODE, "inet", NULL,
2455 NULL, 0, NULL, 0,
2456 CTL_NET, PF_INET, CTL_EOL);
2457 sysctl_createv(clog, 0, NULL, NULL,
2458 CTLFLAG_PERMANENT,
2459 CTLTYPE_NODE, "carp",
2460 SYSCTL_DESCR("CARP related settings"),
2461 NULL, 0, NULL, 0,
2462 CTL_NET, PF_INET, IPPROTO_CARP, CTL_EOL);
2463
2464 sysctl_createv(clog, 0, NULL, NULL,
2465 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2466 CTLTYPE_INT, "preempt",
2467 SYSCTL_DESCR("Enable CARP Preempt"),
2468 NULL, 0, &carp_opts[CARPCTL_PREEMPT], 0,
2469 CTL_NET, PF_INET, IPPROTO_CARP,
2470 CTL_CREATE, CTL_EOL);
2471 sysctl_createv(clog, 0, NULL, NULL,
2472 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2473 CTLTYPE_INT, "arpbalance",
2474 SYSCTL_DESCR("Enable ARP balancing"),
2475 NULL, 0, &carp_opts[CARPCTL_ARPBALANCE], 0,
2476 CTL_NET, PF_INET, IPPROTO_CARP,
2477 CTL_CREATE, CTL_EOL);
2478 sysctl_createv(clog, 0, NULL, NULL,
2479 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2480 CTLTYPE_INT, "allow",
2481 SYSCTL_DESCR("Enable CARP"),
2482 NULL, 0, &carp_opts[CARPCTL_ALLOW], 0,
2483 CTL_NET, PF_INET, IPPROTO_CARP,
2484 CTL_CREATE, CTL_EOL);
2485 sysctl_createv(clog, 0, NULL, NULL,
2486 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2487 CTLTYPE_INT, "log",
2488 SYSCTL_DESCR("CARP logging"),
2489 NULL, 0, &carp_opts[CARPCTL_LOG], 0,
2490 CTL_NET, PF_INET, IPPROTO_CARP,
2491 CTL_CREATE, CTL_EOL);
2492 sysctl_createv(clog, 0, NULL, NULL,
2493 CTLFLAG_PERMANENT,
2494 CTLTYPE_STRUCT, "stats",
2495 SYSCTL_DESCR("CARP statistics"),
2496 sysctl_net_inet_carp_stats, 0, NULL, 0,
2497 CTL_NET, PF_INET, IPPROTO_CARP, CARPCTL_STATS,
2498 CTL_EOL);
2499 }
2500