IA_PRF_RTEXISTOK is no longer needed, in_{add,scrub}prefix() does more
[dragonfly.git] / sys / netinet / ip_carp.c
CommitLineData
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1/*
2 * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
3 * Copyright (c) 2003 Ryan McBride. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
18 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
20 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
22 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
23 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
24 * THE POSSIBILITY OF SUCH DAMAGE.
25 */
26/*
27 * $FreeBSD: src/sys/netinet/ip_carp.c,v 1.48 2007/02/02 09:39:09 glebius Exp $
297c8124 28 * $DragonFly: src/sys/netinet/ip_carp.c,v 1.10 2008/07/27 10:06:57 sephe Exp $
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29 */
30
31#include "opt_carp.h"
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32#include "opt_inet.h"
33#include "opt_inet6.h"
34
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35#include <sys/param.h>
36#include <sys/systm.h>
0d16ba1d 37#include <sys/kernel.h>
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38#include <sys/in_cksum.h>
39#include <sys/limits.h>
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40#include <sys/malloc.h>
41#include <sys/mbuf.h>
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42#include <sys/time.h>
43#include <sys/proc.h>
0d16ba1d 44#include <sys/sockio.h>
0d16ba1d 45#include <sys/socket.h>
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46#include <sys/sysctl.h>
47#include <sys/syslog.h>
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48
49#include <machine/stdarg.h>
e826b942 50#include <crypto/sha1.h>
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51
52#include <net/bpf.h>
53#include <net/ethernet.h>
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54#include <net/if.h>
55#include <net/if_dl.h>
56#include <net/if_types.h>
57#include <net/route.h>
65a24520 58#include <net/if_clone.h>
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59
60#ifdef INET
61#include <netinet/in.h>
62#include <netinet/in_var.h>
63#include <netinet/in_systm.h>
64#include <netinet/ip.h>
65#include <netinet/ip_var.h>
66#include <netinet/if_ether.h>
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67#endif
68
69#ifdef INET6
70#include <netinet/icmp6.h>
71#include <netinet/ip6.h>
72#include <netinet6/ip6_var.h>
73#include <netinet6/scope6_var.h>
74#include <netinet6/nd6.h>
75#endif
76
0d16ba1d 77#include <netinet/ip_carp.h>
0d16ba1d 78
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79#define CARP_IFNAME "carp"
80#define CARP_IS_RUNNING(ifp) \
81 (((ifp)->if_flags & (IFF_UP | IFF_RUNNING)) == (IFF_UP | IFF_RUNNING))
0d16ba1d 82
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83struct carp_vhaddr {
84 uint32_t vha_flags; /* CARP_VHAF_ */
85 const struct in_ifaddr *vha_ia; /* carp address */
86 const struct in_ifaddr *vha_iaback; /* backing address */
87 TAILQ_ENTRY(carp_vhaddr) vha_link;
88};
89TAILQ_HEAD(carp_vhaddr_list, carp_vhaddr);
90
0d16ba1d 91struct carp_softc {
59bdf78a 92 struct ifnet sc_if;
2d8547d8 93 struct ifnet *sc_carpdev; /* parent interface */
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94 struct carp_vhaddr_list sc_vha_list; /* virtual addr list */
95
96 const struct in_ifaddr *sc_ia; /* primary iface address v4 */
0d16ba1d 97 struct ip_moptions sc_imo;
5bd4422e 98
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99#ifdef INET6
100 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */
101 struct ip6_moptions sc_im6o;
102#endif /* INET6 */
103 TAILQ_ENTRY(carp_softc) sc_list;
104
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105 enum { INIT = 0, BACKUP, MASTER }
106 sc_state;
5bd4422e 107 int sc_dead;
0d16ba1d 108
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109 int sc_suppress;
110
111 int sc_sendad_errors;
112#define CARP_SENDAD_MAX_ERRORS 3
113 int sc_sendad_success;
114#define CARP_SENDAD_MIN_SUCCESS 3
115
116 int sc_vhid;
117 int sc_advskew;
5bd4422e 118 int sc_naddrs; /* actually used IPv4 vha */
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119 int sc_naddrs6;
120 int sc_advbase; /* seconds */
121 int sc_init_counter;
ab398e4b 122 uint64_t sc_counter;
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123
124 /* authentication */
125#define CARP_HMAC_PAD 64
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126 unsigned char sc_key[CARP_KEY_LEN];
127 unsigned char sc_pad[CARP_HMAC_PAD];
128 SHA1_CTX sc_sha1;
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129
130 struct callout sc_ad_tmo; /* advertisement timeout */
131 struct callout sc_md_tmo; /* master down timeout */
132 struct callout sc_md6_tmo; /* master down timeout */
2d8547d8 133
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134 LIST_ENTRY(carp_softc) sc_next; /* Interface clue */
135};
0d16ba1d 136
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137struct carp_if {
138 TAILQ_HEAD(, carp_softc) vhif_vrs;
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139};
140
141enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING };
142
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143SYSCTL_DECL(_net_inet_carp);
144
301d10d8 145static int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */
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146SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW,
147 &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets");
148SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW,
149 &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode");
150SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW,
151 &carp_opts[CARPCTL_LOG], 0, "log bad carp packets");
152SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW,
153 &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses");
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154
155static int carp_suppress_preempt = 0;
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156SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD,
157 &carp_suppress_preempt, 0, "Preemption is suppressed");
158
301d10d8 159static struct carpstats carpstats;
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160SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW,
161 &carpstats, carpstats,
162 "CARP statistics (struct carpstats, netinet/ip_carp.h)");
163
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164#define CARP_LOG(...) do { \
165 if (carp_opts[CARPCTL_LOG] > 0) \
166 log(LOG_INFO, __VA_ARGS__); \
167} while (0)
168
169#define CARP_DEBUG(...) do { \
170 if (carp_opts[CARPCTL_LOG] > 1) \
171 log(LOG_DEBUG, __VA_ARGS__); \
172} while (0)
173
174static void carp_hmac_prepare(struct carp_softc *);
ab398e4b 175static void carp_hmac_generate(struct carp_softc *, uint32_t *,
0d16ba1d 176 unsigned char *);
ab398e4b 177static int carp_hmac_verify(struct carp_softc *, uint32_t *,
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178 unsigned char *);
179static void carp_setroute(struct carp_softc *, int);
180static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t);
181static int carp_clone_create(struct if_clone *, int);
182static void carp_clone_destroy(struct ifnet *);
5bd4422e 183static void carp_detach(struct carp_softc *, int);
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184static int carp_prepare_ad(struct mbuf *, struct carp_softc *,
185 struct carp_header *);
186static void carp_send_ad_all(void);
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187static void carp_send_ad_timeout(void *);
188static void carp_send_ad(struct carp_softc *);
0d16ba1d 189static void carp_send_arp(struct carp_softc *);
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190static void carp_master_down_timeout(void *);
191static void carp_master_down(struct carp_softc *);
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192static int carp_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
193static int carp_looutput(struct ifnet *, struct mbuf *, struct sockaddr *,
194 struct rtentry *);
195static void carp_start(struct ifnet *);
196static void carp_setrun(struct carp_softc *, sa_family_t);
197static void carp_set_state(struct carp_softc *, int);
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198
199static void carp_multicast_cleanup(struct carp_softc *);
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200static void carp_add_addr(struct carp_softc *, struct ifaddr *);
201static void carp_del_addr(struct carp_softc *, struct ifaddr *);
202static void carp_config_addr(struct carp_softc *, struct ifaddr *);
203static void carp_link_addrs(struct carp_softc *, struct ifnet *,
204 struct ifaddr *);
205static void carp_unlink_addrs(struct carp_softc *, struct ifnet *,
206 struct ifaddr *);
207
208static int carp_get_vhaddr(struct carp_softc *, struct ifdrv *);
209static int carp_config_vhaddr(struct carp_softc *, struct carp_vhaddr *);
210static int carp_activate_vhaddr(struct carp_softc *, struct carp_vhaddr *,
211 struct ifnet *, const struct in_ifaddr *, int);
212static void carp_deactivate_vhaddr(struct carp_softc *,
213 struct carp_vhaddr *);
214
215static void carp_sc_state(struct carp_softc *);
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216#ifdef INET6
217static void carp_send_na(struct carp_softc *);
218static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *);
219static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *);
220static void carp_multicast6_cleanup(struct carp_softc *);
221#endif
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222static void carp_stop(struct carp_softc *, int);
223static void carp_reset(struct carp_softc *, int);
224
225static void carp_ifaddr(void *, struct ifnet *, enum ifaddr_event,
226 struct ifaddr *);
227static void carp_ifdetach(void *, struct ifnet *);
0d16ba1d 228
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229static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces");
230
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231static LIST_HEAD(, carp_softc) carpif_list;
232
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233static struct if_clone carp_cloner =
234IF_CLONE_INITIALIZER(CARP_IFNAME, carp_clone_create, carp_clone_destroy,
235 0, IF_MAXUNIT);
0d16ba1d 236
2d8547d8 237static eventhandler_tag carp_ifdetach_event;
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238static eventhandler_tag carp_ifaddr_event;
239
240static __inline void
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241carp_insert_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha_new)
242{
243 struct carp_vhaddr *vha;
244 u_long new_addr, addr;
245
246 KKASSERT((vha_new->vha_flags & CARP_VHAF_ONLIST) == 0);
247
248 /*
249 * Virtual address list is sorted; smaller one first
250 */
251 new_addr = ntohl(vha_new->vha_ia->ia_addr.sin_addr.s_addr);
252
253 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
254 addr = ntohl(vha->vha_ia->ia_addr.sin_addr.s_addr);
255
256 if (addr > new_addr)
257 break;
258 }
259 if (vha == NULL)
260 TAILQ_INSERT_TAIL(&sc->sc_vha_list, vha_new, vha_link);
261 else
262 TAILQ_INSERT_BEFORE(vha, vha_new, vha_link);
263 vha_new->vha_flags |= CARP_VHAF_ONLIST;
264}
265
266static __inline void
267carp_remove_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha)
268{
269 KKASSERT(vha->vha_flags & CARP_VHAF_ONLIST);
270 vha->vha_flags &= ~CARP_VHAF_ONLIST;
271 TAILQ_REMOVE(&sc->sc_vha_list, vha, vha_link);
272}
0d16ba1d 273
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274static void
275carp_hmac_prepare(struct carp_softc *sc)
276{
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277 uint8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
278 uint8_t vhid = sc->sc_vhid & 0xff;
b2632176 279 struct ifaddr_container *ifac;
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280 int i;
281#ifdef INET6
282 struct in6_addr in6;
283#endif
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284#ifdef INET
285 struct carp_vhaddr *vha;
286#endif
0d16ba1d 287
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288 /* XXX: possible race here */
289
290 /* compute ipad from key */
291 bzero(sc->sc_pad, sizeof(sc->sc_pad));
292 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
293 for (i = 0; i < sizeof(sc->sc_pad); i++)
294 sc->sc_pad[i] ^= 0x36;
295
296 /* precompute first part of inner hash */
297 SHA1Init(&sc->sc_sha1);
298 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
299 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
300 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
301 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
302#ifdef INET
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303 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
304 SHA1Update(&sc->sc_sha1,
305 (const uint8_t *)&vha->vha_ia->ia_addr.sin_addr,
306 sizeof(struct in_addr));
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307 }
308#endif /* INET */
309#ifdef INET6
5bd4422e 310 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
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311 struct ifaddr *ifa = ifac->ifa;
312
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313 if (ifa->ifa_addr->sa_family == AF_INET6) {
314 in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
315 in6_clearscope(&in6);
316 SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6));
317 }
318 }
319#endif /* INET6 */
320
321 /* convert ipad to opad */
322 for (i = 0; i < sizeof(sc->sc_pad); i++)
323 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
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324}
325
326static void
ab398e4b 327carp_hmac_generate(struct carp_softc *sc, uint32_t counter[2],
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328 unsigned char md[20])
329{
330 SHA1_CTX sha1ctx;
331
332 /* fetch first half of inner hash */
333 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
334
335 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
336 SHA1Final(md, &sha1ctx);
337
338 /* outer hash */
339 SHA1Init(&sha1ctx);
340 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
341 SHA1Update(&sha1ctx, md, 20);
342 SHA1Final(md, &sha1ctx);
343}
344
345static int
ab398e4b 346carp_hmac_verify(struct carp_softc *sc, uint32_t counter[2],
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347 unsigned char md[20])
348{
349 unsigned char md2[20];
350
0d16ba1d 351 carp_hmac_generate(sc, counter, md2);
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352 return (bcmp(md, md2, sizeof(md2)));
353}
354
355static void
356carp_setroute(struct carp_softc *sc, int cmd)
357{
5bd4422e 358#ifdef INET6
b2632176 359 struct ifaddr_container *ifac;
0d16ba1d 360
0d16ba1d 361 crit_enter();
5bd4422e 362 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
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363 struct ifaddr *ifa = ifac->ifa;
364
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365 if (ifa->ifa_addr->sa_family == AF_INET6) {
366 if (cmd == RTM_ADD)
367 in6_ifaddloop(ifa);
368 else
369 in6_ifremloop(ifa);
370 }
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371 }
372 crit_exit();
5bd4422e 373#endif /* INET6 */
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374}
375
376static int
377carp_clone_create(struct if_clone *ifc, int unit)
378{
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379 struct carp_softc *sc;
380 struct ifnet *ifp;
84922d39 381
59bdf78a 382 sc = kmalloc(sizeof(*sc), M_CARP, M_WAITOK | M_ZERO);
5bd4422e 383 ifp = &sc->sc_if;
0d16ba1d 384
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385 sc->sc_suppress = 0;
386 sc->sc_advbase = CARP_DFLTINTV;
387 sc->sc_vhid = -1; /* required setting */
388 sc->sc_advskew = 0;
389 sc->sc_init_counter = 1;
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390 sc->sc_naddrs = 0;
391 sc->sc_naddrs6 = 0;
392
393 TAILQ_INIT(&sc->sc_vha_list);
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394
395#ifdef INET6
396 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
397#endif
398
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399 callout_init(&sc->sc_ad_tmo);
400 callout_init(&sc->sc_md_tmo);
401 callout_init(&sc->sc_md6_tmo);
402
403 ifp->if_softc = sc;
404 if_initname(ifp, CARP_IFNAME, unit);
405 ifp->if_mtu = ETHERMTU;
406 ifp->if_flags = IFF_LOOPBACK;
407 ifp->if_ioctl = carp_ioctl;
408 ifp->if_output = carp_looutput;
409 ifp->if_start = carp_start;
410 ifp->if_type = IFT_CARP;
411 ifp->if_snd.ifq_maxlen = ifqmaxlen;
412 ifp->if_hdrlen = 0;
413 if_attach(ifp, NULL);
414 bpfattach(ifp, DLT_NULL, sizeof(u_int));
415
416 crit_enter();
417 LIST_INSERT_HEAD(&carpif_list, sc, sc_next);
418 crit_exit();
419
420 return (0);
421}
422
423static void
424carp_clone_destroy(struct ifnet *ifp)
425{
426 struct carp_softc *sc = ifp->if_softc;
427
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428 sc->sc_dead = 1;
429 carp_detach(sc, 1);
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430
431 crit_enter();
432 LIST_REMOVE(sc, sc_next);
433 crit_exit();
434 bpfdetach(ifp);
435 if_detach(ifp);
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436
437 KASSERT(sc->sc_naddrs == 0, ("certain inet address is still active\n"));
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438 kfree(sc, M_CARP);
439}
440
0d16ba1d 441static void
5bd4422e 442carp_detach(struct carp_softc *sc, int detach)
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443{
444 struct carp_if *cif;
445
5bd4422e 446 carp_reset(sc, detach);
0d16ba1d 447
5bd4422e 448 carp_multicast_cleanup(sc);
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449#ifdef INET6
450 carp_multicast6_cleanup(sc);
451#endif
452
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453 if (!sc->sc_dead && detach) {
454 struct carp_vhaddr *vha;
455
456 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
457 carp_deactivate_vhaddr(sc, vha);
458 KKASSERT(sc->sc_naddrs == 0);
459 }
460
0d16ba1d 461 if (sc->sc_carpdev != NULL) {
5bd4422e 462 cif = sc->sc_carpdev->if_carp;
0d16ba1d 463 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
5bd4422e 464 if (TAILQ_EMPTY(&cif->vhif_vrs)) {
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MD
465 ifpromisc(sc->sc_carpdev, 0);
466 sc->sc_carpdev->if_carp = NULL;
5bd4422e 467 kfree(cif, M_CARP);
1fd4429c 468 }
0d16ba1d 469 sc->sc_carpdev = NULL;
5bd4422e 470 sc->sc_ia = NULL;
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471 }
472}
473
474/* Detach an interface from the carp. */
475static void
476carp_ifdetach(void *arg __unused, struct ifnet *ifp)
477{
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478 struct carp_if *cif = ifp->if_carp;
479 struct carp_softc *sc;
0d16ba1d 480
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481 while (ifp->if_carp &&
482 (sc = TAILQ_FIRST(&cif->vhif_vrs)) != NULL)
483 carp_detach(sc, 1);
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484}
485
486/*
487 * process input packet.
488 * we have rearranged checks order compared to the rfc,
489 * but it seems more efficient this way or not possible otherwise.
490 */
491void
b5e5b41c 492carp_input(struct mbuf *m, ...)
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493{
494 struct ip *ip = mtod(m, struct ip *);
495 struct carp_header *ch;
7e90771f 496 int len, iphlen;
b5e5b41c
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497 __va_list ap;
498
499 __va_start(ap, m);
7e90771f 500 iphlen = __va_arg(ap, int);
b5e5b41c 501 __va_end(ap);
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502
503 carpstats.carps_ipackets++;
504
505 if (!carp_opts[CARPCTL_ALLOW]) {
506 m_freem(m);
507 return;
508 }
509
7e90771f 510 /* Check if received on a valid carp interface */
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511 if (m->m_pkthdr.rcvif->if_carp == NULL) {
512 carpstats.carps_badif++;
513 CARP_LOG("carp_input: packet received on non-carp "
514 "interface: %s\n",
515 m->m_pkthdr.rcvif->if_xname);
516 m_freem(m);
517 return;
518 }
519
7e90771f 520 /* Verify that the IP TTL is CARP_DFLTTL. */
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521 if (ip->ip_ttl != CARP_DFLTTL) {
522 carpstats.carps_badttl++;
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523 CARP_LOG("carp_input: received ttl %d != %d on %s\n",
524 ip->ip_ttl, CARP_DFLTTL,
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525 m->m_pkthdr.rcvif->if_xname);
526 m_freem(m);
527 return;
528 }
529
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530 /* Minimal CARP packet size */
531 len = iphlen + sizeof(*ch);
0d16ba1d 532
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533 /*
534 * Verify that the received packet length is
535 * not less than the CARP header
536 */
537 if (m->m_pkthdr.len < len) {
0d16ba1d 538 carpstats.carps_badlen++;
7e90771f
SZ
539 CARP_LOG("packet too short %d on %s\n", m->m_pkthdr.len,
540 m->m_pkthdr.rcvif->if_xname);
0d16ba1d
MD
541 m_freem(m);
542 return;
543 }
544
7e90771f 545 /* Make sure that CARP header is contiguous */
210adaf6 546 if (len > m->m_len) {
7e90771f
SZ
547 m = m_pullup(m, len);
548 if (m == NULL) {
0d16ba1d 549 carpstats.carps_hdrops++;
7e90771f 550 CARP_LOG("carp_input: m_pullup failed\n");
0d16ba1d
MD
551 return;
552 }
553 ip = mtod(m, struct ip *);
554 }
7e90771f 555 ch = (struct carp_header *)((uint8_t *)ip + iphlen);
0d16ba1d 556
7e90771f
SZ
557 /* Verify the CARP checksum */
558 if (in_cksum_skip(m, len, iphlen)) {
0d16ba1d
MD
559 carpstats.carps_badsum++;
560 CARP_LOG("carp_input: checksum failed on %s\n",
561 m->m_pkthdr.rcvif->if_xname);
562 m_freem(m);
563 return;
564 }
0d16ba1d
MD
565 carp_input_c(m, ch, AF_INET);
566}
567
568#ifdef INET6
569int
570carp6_input(struct mbuf **mp, int *offp, int proto)
571{
572 struct mbuf *m = *mp;
573 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
574 struct carp_header *ch;
575 u_int len;
576
577 carpstats.carps_ipackets6++;
578
579 if (!carp_opts[CARPCTL_ALLOW]) {
580 m_freem(m);
581 return (IPPROTO_DONE);
582 }
583
584 /* check if received on a valid carp interface */
585 if (m->m_pkthdr.rcvif->if_carp == NULL) {
586 carpstats.carps_badif++;
587 CARP_LOG("carp6_input: packet received on non-carp "
588 "interface: %s\n",
589 m->m_pkthdr.rcvif->if_xname);
590 m_freem(m);
591 return (IPPROTO_DONE);
592 }
593
594 /* verify that the IP TTL is 255 */
595 if (ip6->ip6_hlim != CARP_DFLTTL) {
596 carpstats.carps_badttl++;
597 CARP_LOG("carp6_input: received ttl %d != 255 on %s\n",
598 ip6->ip6_hlim,
599 m->m_pkthdr.rcvif->if_xname);
600 m_freem(m);
601 return (IPPROTO_DONE);
602 }
603
604 /* verify that we have a complete carp packet */
605 len = m->m_len;
606 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
607 if (ch == NULL) {
608 carpstats.carps_badlen++;
609 CARP_LOG("carp6_input: packet size %u too small\n", len);
610 return (IPPROTO_DONE);
611 }
612
0d16ba1d 613 /* verify the CARP checksum */
e19289ce 614 if (in_cksum_range(m, 0, *offp, sizeof(*ch))) {
0d16ba1d
MD
615 carpstats.carps_badsum++;
616 CARP_LOG("carp6_input: checksum failed, on %s\n",
617 m->m_pkthdr.rcvif->if_xname);
618 m_freem(m);
619 return (IPPROTO_DONE);
620 }
0d16ba1d
MD
621
622 carp_input_c(m, ch, AF_INET6);
623 return (IPPROTO_DONE);
624}
625#endif /* INET6 */
626
627static void
628carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af)
629{
630 struct ifnet *ifp = m->m_pkthdr.rcvif;
5bd4422e 631 struct ifnet *cifp;
0d16ba1d 632 struct carp_softc *sc;
ab398e4b 633 uint64_t tmp_counter;
0d16ba1d
MD
634 struct timeval sc_tv, ch_tv;
635
636 /* verify that the VHID is valid on the receiving interface */
0d16ba1d
MD
637 TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list)
638 if (sc->sc_vhid == ch->carp_vhid)
639 break;
640
5bd4422e 641 if (!sc || !CARP_IS_RUNNING(&sc->sc_if)) {
0d16ba1d 642 carpstats.carps_badvhid++;
0d16ba1d
MD
643 m_freem(m);
644 return;
645 }
5bd4422e 646 cifp = &sc->sc_if;
0d16ba1d 647
5bd4422e
SZ
648 getmicrotime(&cifp->if_lastchange);
649 cifp->if_ipackets++;
650 cifp->if_ibytes += m->m_pkthdr.len;
0d16ba1d 651
5bd4422e 652 if (cifp->if_bpf) {
0d16ba1d
MD
653 struct ip *ip = mtod(m, struct ip *);
654
655 /* BPF wants net byte order */
656 ip->ip_len = htons(ip->ip_len + (ip->ip_hl << 2));
657 ip->ip_off = htons(ip->ip_off);
5bd4422e 658 bpf_mtap(cifp->if_bpf, m);
0d16ba1d
MD
659 }
660
661 /* verify the CARP version. */
662 if (ch->carp_version != CARP_VERSION) {
663 carpstats.carps_badver++;
5bd4422e
SZ
664 cifp->if_ierrors++;
665 CARP_LOG("%s; invalid version %d\n", cifp->if_xname,
666 ch->carp_version);
0d16ba1d
MD
667 m_freem(m);
668 return;
669 }
670
671 /* verify the hash */
672 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
673 carpstats.carps_badauth++;
5bd4422e
SZ
674 cifp->if_ierrors++;
675 CARP_LOG("%s: incorrect hash\n", cifp->if_xname);
0d16ba1d
MD
676 m_freem(m);
677 return;
678 }
679
680 tmp_counter = ntohl(ch->carp_counter[0]);
681 tmp_counter = tmp_counter<<32;
682 tmp_counter += ntohl(ch->carp_counter[1]);
683
684 /* XXX Replay protection goes here */
685
686 sc->sc_init_counter = 0;
687 sc->sc_counter = tmp_counter;
688
689 sc_tv.tv_sec = sc->sc_advbase;
690 if (carp_suppress_preempt && sc->sc_advskew < 240)
691 sc_tv.tv_usec = 240 * 1000000 / 256;
692 else
693 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256;
694 ch_tv.tv_sec = ch->carp_advbase;
695 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
696
697 switch (sc->sc_state) {
698 case INIT:
699 break;
84922d39 700
0d16ba1d
MD
701 case MASTER:
702 /*
703 * If we receive an advertisement from a master who's going to
704 * be more frequent than us, go into BACKUP state.
705 */
706 if (timevalcmp(&sc_tv, &ch_tv, >) ||
707 timevalcmp(&sc_tv, &ch_tv, ==)) {
708 callout_stop(&sc->sc_ad_tmo);
709 CARP_DEBUG("%s: MASTER -> BACKUP "
710 "(more frequent advertisement received)\n",
5bd4422e 711 cifp->if_xname);
0d16ba1d
MD
712 carp_set_state(sc, BACKUP);
713 carp_setrun(sc, 0);
714 carp_setroute(sc, RTM_DELETE);
715 }
716 break;
84922d39 717
0d16ba1d
MD
718 case BACKUP:
719 /*
720 * If we're pre-empting masters who advertise slower than us,
721 * and this one claims to be slower, treat him as down.
722 */
723 if (carp_opts[CARPCTL_PREEMPT] &&
724 timevalcmp(&sc_tv, &ch_tv, <)) {
725 CARP_DEBUG("%s: BACKUP -> MASTER "
5bd4422e
SZ
726 "(preempting a slower master)\n", cifp->if_xname);
727 carp_master_down(sc);
0d16ba1d
MD
728 break;
729 }
730
731 /*
732 * If the master is going to advertise at such a low frequency
733 * that he's guaranteed to time out, we'd might as well just
734 * treat him as timed out now.
735 */
736 sc_tv.tv_sec = sc->sc_advbase * 3;
737 if (timevalcmp(&sc_tv, &ch_tv, <)) {
5bd4422e
SZ
738 CARP_DEBUG("%s: BACKUP -> MASTER (master timed out)\n",
739 cifp->if_xname);
740 carp_master_down(sc);
0d16ba1d
MD
741 break;
742 }
743
744 /*
745 * Otherwise, we reset the counter and wait for the next
746 * advertisement.
747 */
748 carp_setrun(sc, af);
749 break;
750 }
0d16ba1d 751 m_freem(m);
0d16ba1d
MD
752}
753
754static int
755carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch)
756{
5bd4422e 757 struct ifnet *cifp = &sc->sc_if;
0d16ba1d 758 struct m_tag *mtag;
0d16ba1d
MD
759
760 if (sc->sc_init_counter) {
761 /* this could also be seconds since unix epoch */
762 sc->sc_counter = karc4random();
763 sc->sc_counter = sc->sc_counter << 32;
764 sc->sc_counter += karc4random();
84922d39 765 } else {
0d16ba1d 766 sc->sc_counter++;
84922d39 767 }
0d16ba1d 768
5bd4422e
SZ
769 ch->carp_counter[0] = htonl((sc->sc_counter >> 32) & 0xffffffff);
770 ch->carp_counter[1] = htonl(sc->sc_counter & 0xffffffff);
0d16ba1d
MD
771
772 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
773
774 /* Tag packet for carp_output */
11f57810 775 mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct ifnet *), MB_DONTWAIT);
0d16ba1d
MD
776 if (mtag == NULL) {
777 m_freem(m);
5bd4422e
SZ
778 cifp->if_oerrors++;
779 return ENOMEM;
0d16ba1d 780 }
5bd4422e 781 bcopy(&cifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *));
0d16ba1d
MD
782 m_tag_prepend(m, mtag);
783
5bd4422e 784 return 0;
0d16ba1d
MD
785}
786
787static void
788carp_send_ad_all(void)
789{
790 struct carp_softc *sc;
791
792 LIST_FOREACH(sc, &carpif_list, sc_next) {
793 if (sc->sc_carpdev == NULL)
794 continue;
84922d39 795
5bd4422e
SZ
796 if (CARP_IS_RUNNING(&sc->sc_if) && sc->sc_state == MASTER)
797 carp_send_ad(sc);
0d16ba1d
MD
798 }
799}
800
801static void
5bd4422e 802carp_send_ad_timeout(void *xsc)
0d16ba1d 803{
5bd4422e 804 carp_send_ad(xsc);
0d16ba1d
MD
805}
806
807static void
5bd4422e 808carp_send_ad(struct carp_softc *sc)
0d16ba1d 809{
5bd4422e 810 struct ifnet *cifp = &sc->sc_if;
0d16ba1d
MD
811 struct carp_header ch;
812 struct timeval tv;
813 struct carp_header *ch_ptr;
814 struct mbuf *m;
815 int len, advbase, advskew;
816
5bd4422e
SZ
817 if (!CARP_IS_RUNNING(cifp)) {
818 /* Bow out */
0d16ba1d
MD
819 advbase = 255;
820 advskew = 255;
821 } else {
822 advbase = sc->sc_advbase;
823 if (!carp_suppress_preempt || sc->sc_advskew > 240)
824 advskew = sc->sc_advskew;
825 else
826 advskew = 240;
827 tv.tv_sec = advbase;
828 tv.tv_usec = advskew * 1000000 / 256;
829 }
830
831 ch.carp_version = CARP_VERSION;
832 ch.carp_type = CARP_ADVERTISEMENT;
833 ch.carp_vhid = sc->sc_vhid;
834 ch.carp_advbase = advbase;
835 ch.carp_advskew = advskew;
836 ch.carp_authlen = 7; /* XXX DEFINE */
837 ch.carp_pad1 = 0; /* must be zero */
838 ch.carp_cksum = 0;
839
840#ifdef INET
5bd4422e 841 if (sc->sc_ia != NULL) {
0d16ba1d
MD
842 struct ip *ip;
843
5bd4422e 844 MGETHDR(m, MB_DONTWAIT, MT_HEADER);
0d16ba1d 845 if (m == NULL) {
5bd4422e 846 cifp->if_oerrors++;
0d16ba1d
MD
847 carpstats.carps_onomem++;
848 /* XXX maybe less ? */
849 if (advbase != 255 || advskew != 255)
850 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
5bd4422e 851 carp_send_ad_timeout, sc);
0d16ba1d
MD
852 return;
853 }
854 len = sizeof(*ip) + sizeof(ch);
855 m->m_pkthdr.len = len;
856 m->m_pkthdr.rcvif = NULL;
857 m->m_len = len;
858 MH_ALIGN(m, m->m_len);
859 m->m_flags |= M_MCAST;
860 ip = mtod(m, struct ip *);
861 ip->ip_v = IPVERSION;
862 ip->ip_hl = sizeof(*ip) >> 2;
863 ip->ip_tos = IPTOS_LOWDELAY;
864 ip->ip_len = len;
865 ip->ip_id = ip_newid();
866 ip->ip_off = IP_DF;
867 ip->ip_ttl = CARP_DFLTTL;
868 ip->ip_p = IPPROTO_CARP;
869 ip->ip_sum = 0;
5bd4422e 870 ip->ip_src = sc->sc_ia->ia_addr.sin_addr;
0d16ba1d
MD
871 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
872
873 ch_ptr = (struct carp_header *)(&ip[1]);
874 bcopy(&ch, ch_ptr, sizeof(ch));
875 if (carp_prepare_ad(m, sc, ch_ptr))
876 return;
e19289ce 877 ch_ptr->carp_cksum = in_cksum_skip(m, len, sizeof(*ip));
0d16ba1d 878
5bd4422e
SZ
879 getmicrotime(&cifp->if_lastchange);
880 cifp->if_opackets++;
881 cifp->if_obytes += len;
0d16ba1d
MD
882 carpstats.carps_opackets++;
883
884 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) {
5bd4422e 885 cifp->if_oerrors++;
0d16ba1d
MD
886 if (sc->sc_sendad_errors < INT_MAX)
887 sc->sc_sendad_errors++;
888 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
889 carp_suppress_preempt++;
890 if (carp_suppress_preempt == 1) {
0d16ba1d 891 carp_send_ad_all();
0d16ba1d
MD
892 }
893 }
894 sc->sc_sendad_success = 0;
895 } else {
896 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
897 if (++sc->sc_sendad_success >=
898 CARP_SENDAD_MIN_SUCCESS) {
899 carp_suppress_preempt--;
900 sc->sc_sendad_errors = 0;
901 }
84922d39 902 } else {
0d16ba1d 903 sc->sc_sendad_errors = 0;
84922d39 904 }
0d16ba1d
MD
905 }
906 }
907#endif /* INET */
908#ifdef INET6
909 if (sc->sc_ia6) {
910 struct ip6_hdr *ip6;
911
5bd4422e 912 MGETHDR(m, MB_DONTWAIT, MT_HEADER);
0d16ba1d 913 if (m == NULL) {
5bd4422e 914 cifp->if_oerrors++;
0d16ba1d
MD
915 carpstats.carps_onomem++;
916 /* XXX maybe less ? */
917 if (advbase != 255 || advskew != 255)
918 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
5bd4422e 919 carp_send_ad_timeout, sc);
0d16ba1d
MD
920 return;
921 }
922 len = sizeof(*ip6) + sizeof(ch);
923 m->m_pkthdr.len = len;
924 m->m_pkthdr.rcvif = NULL;
925 m->m_len = len;
926 MH_ALIGN(m, m->m_len);
927 m->m_flags |= M_MCAST;
928 ip6 = mtod(m, struct ip6_hdr *);
929 bzero(ip6, sizeof(*ip6));
930 ip6->ip6_vfc |= IPV6_VERSION;
931 ip6->ip6_hlim = CARP_DFLTTL;
932 ip6->ip6_nxt = IPPROTO_CARP;
933 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src,
934 sizeof(struct in6_addr));
935 /* set the multicast destination */
936
937 ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
938 ip6->ip6_dst.s6_addr8[15] = 0x12;
939 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
5bd4422e 940 cifp->if_oerrors++;
0d16ba1d
MD
941 m_freem(m);
942 CARP_LOG("%s: in6_setscope failed\n", __func__);
943 return;
944 }
945
946 ch_ptr = (struct carp_header *)(&ip6[1]);
947 bcopy(&ch, ch_ptr, sizeof(ch));
948 if (carp_prepare_ad(m, sc, ch_ptr))
949 return;
e19289ce 950 ch_ptr->carp_cksum = in_cksum_skip(m, len, sizeof(*ip6));
0d16ba1d 951
5bd4422e
SZ
952 getmicrotime(&cifp->if_lastchange);
953 cifp->if_opackets++;
954 cifp->if_obytes += len;
0d16ba1d
MD
955 carpstats.carps_opackets6++;
956
957 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) {
5bd4422e 958 cifp->if_oerrors++;
0d16ba1d
MD
959 if (sc->sc_sendad_errors < INT_MAX)
960 sc->sc_sendad_errors++;
961 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
962 carp_suppress_preempt++;
963 if (carp_suppress_preempt == 1) {
0d16ba1d 964 carp_send_ad_all();
0d16ba1d
MD
965 }
966 }
967 sc->sc_sendad_success = 0;
968 } else {
969 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
970 if (++sc->sc_sendad_success >=
971 CARP_SENDAD_MIN_SUCCESS) {
972 carp_suppress_preempt--;
973 sc->sc_sendad_errors = 0;
974 }
84922d39 975 } else {
0d16ba1d 976 sc->sc_sendad_errors = 0;
84922d39 977 }
0d16ba1d
MD
978 }
979 }
980#endif /* INET6 */
981
982 if (advbase != 255 || advskew != 255)
983 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
5bd4422e 984 carp_send_ad_timeout, sc);
0d16ba1d
MD
985}
986
987/*
988 * Broadcast a gratuitous ARP request containing
989 * the virtual router MAC address for each IP address
990 * associated with the virtual router.
991 */
992static void
993carp_send_arp(struct carp_softc *sc)
994{
5bd4422e 995 const struct carp_vhaddr *vha;
0d16ba1d 996
5bd4422e
SZ
997 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
998 if (vha->vha_iaback == NULL)
0d16ba1d 999 continue;
0d16ba1d 1000
5bd4422e
SZ
1001 arp_iainit(sc->sc_carpdev, &vha->vha_ia->ia_addr.sin_addr,
1002 IF_LLADDR(&sc->sc_if));
0d16ba1d
MD
1003 }
1004}
1005
1006#ifdef INET6
1007static void
1008carp_send_na(struct carp_softc *sc)
1009{
b2632176 1010 struct ifaddr_container *ifac;
0d16ba1d
MD
1011 struct in6_addr *in6;
1012 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1013
5bd4422e 1014 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
b2632176 1015 struct ifaddr *ifa = ifac->ifa;
0d16ba1d
MD
1016
1017 if (ifa->ifa_addr->sa_family != AF_INET6)
1018 continue;
1019
1020 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
1021 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1022 ND_NA_FLAG_OVERRIDE, 1, NULL);
1023 DELAY(1000); /* XXX */
1024 }
1025}
1026#endif /* INET6 */
1027
5bd4422e
SZ
1028static __inline const struct carp_vhaddr *
1029carp_find_addr(const struct carp_softc *sc, const struct in_addr *addr)
1030{
1031 struct carp_vhaddr *vha;
1032
1033 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1034 if (vha->vha_iaback == NULL)
1035 continue;
1036
1037 if (vha->vha_ia->ia_addr.sin_addr.s_addr == addr->s_addr)
1038 return vha;
1039 }
1040 return NULL;
1041}
1042
0d16ba1d 1043static int
5bd4422e
SZ
1044carp_iamatch_balance(const struct carp_if *cif, const struct in_addr *itaddr,
1045 const struct in_addr *isaddr, uint8_t **enaddr)
0d16ba1d 1046{
5bd4422e
SZ
1047 const struct carp_softc *vh;
1048 int index, count = 0;
1049
1050 /*
1051 * XXX proof of concept implementation.
1052 * We use the source ip to decide which virtual host should
1053 * handle the request. If we're master of that virtual host,
1054 * then we respond, otherwise, just drop the arp packet on
1055 * the floor.
1056 */
0d16ba1d 1057
0d16ba1d 1058 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
5bd4422e
SZ
1059 if (!CARP_IS_RUNNING(&vh->sc_if))
1060 continue;
1061
1062 if (carp_find_addr(vh, itaddr) != NULL)
1063 count++;
1064 }
1065 if (count == 0)
1066 return 0;
1067
1068 /* this should be a hash, like pf_hash() */
1069 index = ntohl(isaddr->s_addr) % count;
1070 count = 0;
1071
1072 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1073 if (!CARP_IS_RUNNING(&vh->sc_if))
1074 continue;
1075
1076 if (carp_find_addr(vh, itaddr) == NULL)
1077 continue;
1078
1079 if (count == index) {
1080 if (vh->sc_state == MASTER) {
1081 *enaddr = IF_LLADDR(&vh->sc_if);
1082 return 1;
1083 } else {
1084 return 0;
0d16ba1d
MD
1085 }
1086 }
5bd4422e 1087 count++;
0d16ba1d 1088 }
5bd4422e 1089 return 0;
0d16ba1d
MD
1090}
1091
1092int
5bd4422e
SZ
1093carp_iamatch(const void *v, const struct in_addr *itaddr,
1094 const struct in_addr *isaddr, uint8_t **enaddr)
0d16ba1d 1095{
5bd4422e
SZ
1096 const struct carp_if *cif = v;
1097 const struct carp_softc *vh;
0d16ba1d 1098
5bd4422e
SZ
1099 if (carp_opts[CARPCTL_ARPBALANCE])
1100 return carp_iamatch_balance(cif, itaddr, isaddr, enaddr);
0d16ba1d 1101
5bd4422e
SZ
1102 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1103 if (!CARP_IS_RUNNING(&vh->sc_if) || vh->sc_state != MASTER)
1104 continue;
1105
1106 if (carp_find_addr(vh, itaddr) != NULL) {
1107 *enaddr = IF_LLADDR(&vh->sc_if);
1108 return 1;
0d16ba1d
MD
1109 }
1110 }
5bd4422e 1111 return 0;
0d16ba1d
MD
1112}
1113
1114#ifdef INET6
1115struct ifaddr *
1116carp_iamatch6(void *v, struct in6_addr *taddr)
1117{
1118 struct carp_if *cif = v;
1119 struct carp_softc *vh;
0d16ba1d 1120
0d16ba1d 1121 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
b2632176
SZ
1122 struct ifaddr_container *ifac;
1123
5bd4422e 1124 TAILQ_FOREACH(ifac, &vh->sc_if.if_addrheads[mycpuid],
84922d39 1125 ifa_link) {
b2632176
SZ
1126 struct ifaddr *ifa = ifac->ifa;
1127
0d16ba1d
MD
1128 if (IN6_ARE_ADDR_EQUAL(taddr,
1129 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
5bd4422e 1130 CARP_IS_RUNNING(&vh->sc_if) &&
0d16ba1d 1131 vh->sc_state == MASTER) {
0d16ba1d
MD
1132 return (ifa);
1133 }
1134 }
1135 }
0d16ba1d
MD
1136 return (NULL);
1137}
1138
1139void *
1140carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr)
1141{
1142 struct m_tag *mtag;
1143 struct carp_if *cif = v;
1144 struct carp_softc *sc;
0d16ba1d 1145
0d16ba1d 1146 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
b2632176
SZ
1147 struct ifaddr_container *ifac;
1148
5bd4422e 1149 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid],
84922d39 1150 ifa_link) {
b2632176
SZ
1151 struct ifaddr *ifa = ifac->ifa;
1152
0d16ba1d
MD
1153 if (IN6_ARE_ADDR_EQUAL(taddr,
1154 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
5bd4422e
SZ
1155 CARP_IS_RUNNING(&sc->sc_if)) {
1156 struct ifnet *ifp = &sc->sc_if;
1157
0d16ba1d 1158 mtag = m_tag_get(PACKET_TAG_CARP,
11f57810 1159 sizeof(struct ifnet *), MB_DONTWAIT);
0d16ba1d
MD
1160 if (mtag == NULL) {
1161 /* better a bit than nothing */
5bd4422e 1162 return (IF_LLADDR(ifp));
0d16ba1d
MD
1163 }
1164 bcopy(&ifp, (caddr_t)(mtag + 1),
1165 sizeof(struct ifnet *));
1166 m_tag_prepend(m, mtag);
1167
5bd4422e 1168 return (IF_LLADDR(ifp));
0d16ba1d
MD
1169 }
1170 }
1171 }
0d16ba1d
MD
1172 return (NULL);
1173}
1174#endif
1175
5bd4422e
SZ
1176int
1177carp_forus(const void *v, const void *dhost)
0d16ba1d 1178{
5bd4422e
SZ
1179 const struct carp_if *cif = v;
1180 const struct carp_softc *vh;
1181 const uint8_t *ena = dhost;
0d16ba1d
MD
1182
1183 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
5bd4422e 1184 return 0;
0d16ba1d 1185
84922d39 1186 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
5bd4422e
SZ
1187 const struct ifnet *cifp = &vh->sc_if;
1188
1189 if (CARP_IS_RUNNING(cifp) && vh->sc_state == MASTER &&
1190 !bcmp(dhost, IF_LLADDR(cifp), ETHER_ADDR_LEN))
1191 return 1;
84922d39 1192 }
5bd4422e 1193 return 0;
0d16ba1d
MD
1194}
1195
1196static void
5bd4422e 1197carp_master_down_timeout(void *xsc)
0d16ba1d 1198{
5bd4422e 1199 struct carp_softc *sc = xsc;
0d16ba1d 1200
5bd4422e
SZ
1201 CARP_DEBUG("%s: BACKUP -> MASTER (master timed out)\n",
1202 sc->sc_if.if_xname);
1203 carp_master_down(sc);
0d16ba1d
MD
1204}
1205
1206static void
5bd4422e 1207carp_master_down(struct carp_softc *sc)
0d16ba1d 1208{
0d16ba1d
MD
1209 switch (sc->sc_state) {
1210 case INIT:
1211 kprintf("%s: master_down event in INIT state\n",
5bd4422e 1212 sc->sc_if.if_xname);
0d16ba1d 1213 break;
84922d39 1214
0d16ba1d
MD
1215 case MASTER:
1216 break;
84922d39 1217
0d16ba1d
MD
1218 case BACKUP:
1219 carp_set_state(sc, MASTER);
5bd4422e 1220 carp_send_ad(sc);
0d16ba1d
MD
1221 carp_send_arp(sc);
1222#ifdef INET6
1223 carp_send_na(sc);
1224#endif /* INET6 */
1225 carp_setrun(sc, 0);
1226 carp_setroute(sc, RTM_ADD);
1227 break;
1228 }
1229}
1230
1231/*
1232 * When in backup state, af indicates whether to reset the master down timer
1233 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1234 */
1235static void
1236carp_setrun(struct carp_softc *sc, sa_family_t af)
1237{
5bd4422e 1238 struct ifnet *cifp = &sc->sc_if;
0d16ba1d
MD
1239 struct timeval tv;
1240
1241 if (sc->sc_carpdev == NULL) {
0d16ba1d
MD
1242 carp_set_state(sc, INIT);
1243 return;
1244 }
1245
5bd4422e
SZ
1246 if ((cifp->if_flags & IFF_RUNNING) && sc->sc_vhid > 0 &&
1247 (sc->sc_naddrs || sc->sc_naddrs6)) {
1248 /* Nothing */
84922d39 1249 } else {
0d16ba1d
MD
1250 carp_setroute(sc, RTM_DELETE);
1251 return;
1252 }
1253
1254 switch (sc->sc_state) {
1255 case INIT:
1256 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) {
5bd4422e 1257 carp_send_ad(sc);
0d16ba1d
MD
1258 carp_send_arp(sc);
1259#ifdef INET6
1260 carp_send_na(sc);
1261#endif /* INET6 */
1262 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n",
5bd4422e 1263 cifp->if_xname);
0d16ba1d
MD
1264 carp_set_state(sc, MASTER);
1265 carp_setroute(sc, RTM_ADD);
1266 } else {
5bd4422e 1267 CARP_DEBUG("%s: INIT -> BACKUP\n", cifp->if_xname);
0d16ba1d
MD
1268 carp_set_state(sc, BACKUP);
1269 carp_setroute(sc, RTM_DELETE);
1270 carp_setrun(sc, 0);
1271 }
1272 break;
84922d39 1273
0d16ba1d
MD
1274 case BACKUP:
1275 callout_stop(&sc->sc_ad_tmo);
1276 tv.tv_sec = 3 * sc->sc_advbase;
1277 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1278 switch (af) {
1279#ifdef INET
1280 case AF_INET:
1281 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
5bd4422e 1282 carp_master_down_timeout, sc);
0d16ba1d
MD
1283 break;
1284#endif /* INET */
1285#ifdef INET6
1286 case AF_INET6:
1287 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
5bd4422e 1288 carp_master_down_timeout, sc);
0d16ba1d
MD
1289 break;
1290#endif /* INET6 */
1291 default:
1292 if (sc->sc_naddrs)
1293 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
5bd4422e 1294 carp_master_down_timeout, sc);
0d16ba1d
MD
1295 if (sc->sc_naddrs6)
1296 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
5bd4422e 1297 carp_master_down_timeout, sc);
0d16ba1d
MD
1298 break;
1299 }
1300 break;
84922d39 1301
0d16ba1d
MD
1302 case MASTER:
1303 tv.tv_sec = sc->sc_advbase;
1304 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1305 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
5bd4422e 1306 carp_send_ad_timeout, sc);
0d16ba1d
MD
1307 break;
1308 }
1309}
1310
1311static void
1312carp_multicast_cleanup(struct carp_softc *sc)
1313{
1314 struct ip_moptions *imo = &sc->sc_imo;
0d16ba1d 1315
5bd4422e
SZ
1316 if (imo->imo_num_memberships == 0)
1317 return;
1318 KKASSERT(imo->imo_num_memberships == 1);
1319
1320 in_delmulti(imo->imo_membership[0]);
1321 imo->imo_membership[0] = NULL;
0d16ba1d
MD
1322 imo->imo_num_memberships = 0;
1323 imo->imo_multicast_ifp = NULL;
1324}
1325
1326#ifdef INET6
1327static void
1328carp_multicast6_cleanup(struct carp_softc *sc)
1329{
1330 struct ip6_moptions *im6o = &sc->sc_im6o;
1331
1332 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1333 struct in6_multi_mship *imm =
1334 LIST_FIRST(&im6o->im6o_memberships);
1335
1336 LIST_REMOVE(imm, i6mm_chain);
1337 in6_leavegroup(imm);
1338 }
1339 im6o->im6o_multicast_ifp = NULL;
1340}
1341#endif
1342
1343static int
5bd4422e
SZ
1344carp_get_vhaddr(struct carp_softc *sc, struct ifdrv *ifd)
1345{
1346 const struct carp_vhaddr *vha;
1347 struct ifcarpvhaddr *carpa, *carpa0;
1348 int count, len, error;
1349
1350 count = 0;
1351 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
1352 ++count;
1353
1354 if (ifd->ifd_len == 0) {
1355 ifd->ifd_len = count * sizeof(*carpa);
1356 return 0;
1357 } else if (count == 0 || ifd->ifd_len < sizeof(*carpa)) {
1358 ifd->ifd_len = 0;
1359 return 0;
1360 }
1361 len = min(ifd->ifd_len, sizeof(*carpa) * count);
1362 KKASSERT(len >= sizeof(*carpa));
1363
1364 carpa0 = carpa = kmalloc(len, M_TEMP, M_WAITOK | M_NULLOK | M_ZERO);
1365 if (carpa == NULL)
1366 return ENOMEM;
1367
1368 count = 0;
1369 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1370 if (len < sizeof(*carpa))
1371 break;
1372
1373 carpa->carpa_flags = vha->vha_flags;
1374 carpa->carpa_addr.sin_family = AF_INET;
1375 carpa->carpa_addr.sin_addr = vha->vha_ia->ia_addr.sin_addr;
1376
1377 carpa->carpa_baddr.sin_family = AF_INET;
1378 if (vha->vha_iaback == NULL) {
1379 carpa->carpa_baddr.sin_addr.s_addr = INADDR_ANY;
1380 } else {
1381 carpa->carpa_baddr.sin_addr =
1382 vha->vha_iaback->ia_addr.sin_addr;
1383 }
1384
1385 ++carpa;
1386 ++count;
1387 len -= sizeof(*carpa);
1388 }
1389 ifd->ifd_len = sizeof(*carpa) * count;
1390 KKASSERT(ifd->ifd_len > 0);
1391
1392 error = copyout(carpa0, ifd->ifd_data, ifd->ifd_len);
1393 kfree(carpa0, M_TEMP);
1394 return error;
1395}
1396
1397static int
1398carp_config_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha)
0d16ba1d
MD
1399{
1400 struct ifnet *ifp;
5bd4422e 1401 struct in_ifaddr *ia_if;
1b562c24 1402 struct in_ifaddr_container *iac;
5bd4422e
SZ
1403 const struct sockaddr_in *sin;
1404 u_long iaddr;
1405 int own;
1406
1407 KKASSERT(vha->vha_ia != NULL);
1408
1409 sin = &vha->vha_ia->ia_addr;
1410 iaddr = ntohl(sin->sin_addr.s_addr);
1411
1412 ia_if = NULL;
1413 own = 0;
1b562c24 1414 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
5bd4422e
SZ
1415 struct in_ifaddr *ia = iac->ia;
1416
1417 if ((ia->ia_flags & IFA_ROUTE) == 0)
1418 continue;
1419
1420 if (ia->ia_ifp->if_type == IFT_CARP)
1421 continue;
1b562c24 1422
0d16ba1d 1423 /* and, yeah, we need a multicast-capable iface too */
5bd4422e
SZ
1424 if ((ia->ia_ifp->if_flags & IFF_MULTICAST) == 0)
1425 continue;
1426
1427 if ((iaddr & ia->ia_subnetmask) == ia->ia_subnet) {
0d16ba1d
MD
1428 if (sin->sin_addr.s_addr ==
1429 ia->ia_addr.sin_addr.s_addr)
5bd4422e
SZ
1430 own = 1;
1431 if (ia_if == NULL)
1432 ia_if = ia;
1433 else if (sc->sc_carpdev != NULL &&
1434 sc->sc_carpdev == ia->ia_ifp)
1435 ia_if = ia;
0d16ba1d
MD
1436 }
1437 }
84922d39 1438
5bd4422e 1439 carp_deactivate_vhaddr(sc, vha);
0d16ba1d 1440 if (!ia_if)
5bd4422e 1441 return ENOENT;
0d16ba1d 1442
5bd4422e 1443 ifp = ia_if->ia_ifp;
0d16ba1d 1444
5bd4422e
SZ
1445 /* XXX Don't allow parent iface to be changed */
1446 if (sc->sc_carpdev != NULL && sc->sc_carpdev != ifp)
1447 return EEXIST;
0d16ba1d 1448
5bd4422e
SZ
1449 return carp_activate_vhaddr(sc, vha, ifp, ia_if, own);
1450}
0d16ba1d 1451
5bd4422e
SZ
1452static void
1453carp_add_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
1454{
1455 struct carp_vhaddr *vha_new;
1456 struct in_ifaddr *carp_ia;
1457#ifdef INVARIANTS
1458 struct carp_vhaddr *vha;
1459#endif
0d16ba1d 1460
5bd4422e
SZ
1461 KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
1462 carp_ia = ifatoia(carp_ifa);
0d16ba1d 1463
5bd4422e
SZ
1464#ifdef INVARIANTS
1465 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
1466 KKASSERT(vha->vha_ia != NULL && vha->vha_ia != carp_ia);
1467#endif
0d16ba1d 1468
5bd4422e
SZ
1469 vha_new = kmalloc(sizeof(*vha_new), M_CARP, M_WAITOK | M_ZERO);
1470 vha_new->vha_ia = carp_ia;
1471 carp_insert_vhaddr(sc, vha_new);
0d16ba1d 1472
5bd4422e
SZ
1473 if (carp_config_vhaddr(sc, vha_new) != 0) {
1474 /*
1475 * If the above configuration fails, it may only mean
1476 * that the new address is problematic. However, the
1477 * carp(4) interface may already have several working
1478 * addresses. Since the expected behaviour of
1479 * SIOC[AS]IFADDR is to put the NIC into working state,
1480 * we try starting the state machine manually here with
1481 * the hope that the carp(4)'s previously working
1482 * addresses still could be brought up.
1483 */
1484 carp_hmac_prepare(sc);
1485 carp_set_state(sc, INIT);
1486 carp_setrun(sc, 0);
0d16ba1d 1487 }
5bd4422e 1488}
0d16ba1d 1489
5bd4422e
SZ
1490static void
1491carp_del_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
1492{
1493 struct carp_vhaddr *vha;
1494 struct in_ifaddr *carp_ia;
0d16ba1d 1495
5bd4422e
SZ
1496 KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
1497 carp_ia = ifatoia(carp_ifa);
0d16ba1d 1498
5bd4422e
SZ
1499 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1500 KKASSERT(vha->vha_ia != NULL);
1501 if (vha->vha_ia == carp_ia)
1502 break;
1503 }
1504 KASSERT(vha != NULL, ("no corresponding vhaddr %p\n", carp_ifa));
0d16ba1d 1505
5bd4422e
SZ
1506 /*
1507 * Remove the vhaddr from the list before deactivating
1508 * the vhaddr, so that the HMAC could be correctly
1509 * updated in carp_deactivate_vhaddr()
1510 */
1511 carp_remove_vhaddr(sc, vha);
1512
1513 carp_deactivate_vhaddr(sc, vha);
1514 kfree(vha, M_CARP);
0d16ba1d
MD
1515}
1516
5bd4422e
SZ
1517static void
1518carp_config_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
0d16ba1d 1519{
5bd4422e
SZ
1520 struct carp_vhaddr *vha;
1521 struct in_ifaddr *carp_ia;
0d16ba1d 1522
5bd4422e
SZ
1523 KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
1524 carp_ia = ifatoia(carp_ifa);
0d16ba1d 1525
5bd4422e
SZ
1526 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1527 KKASSERT(vha->vha_ia != NULL);
1528 if (vha->vha_ia == carp_ia)
1529 break;
1530 }
1531 KASSERT(vha != NULL, ("no corresponding vhaddr %p\n", carp_ifa));
1532
1533 /* Remove then reinsert, to keep the vhaddr list sorted */
1534 carp_remove_vhaddr(sc, vha);
1535 carp_insert_vhaddr(sc, vha);
1536
1537 if (carp_config_vhaddr(sc, vha) != 0) {
1538 /* See the comment in carp_add_addr() */
1539 carp_hmac_prepare(sc);
1540 carp_set_state(sc, INIT);
1541 carp_setrun(sc, 0);
0d16ba1d 1542 }
0d16ba1d
MD
1543}
1544
1545#ifdef INET6
1546static int
1547carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1548{
1549 struct ifnet *ifp;
1550 struct carp_if *cif;
1551 struct in6_ifaddr *ia, *ia_if;
1552 struct ip6_moptions *im6o = &sc->sc_im6o;
1553 struct in6_multi_mship *imm;
1554 struct in6_addr in6;
1555 int own, error;
1556
1557 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
0d16ba1d
MD
1558 carp_setrun(sc, 0);
1559 return (0);
1560 }
1561
1562 /* we have to do it by hands to check we won't match on us */
1563 ia_if = NULL; own = 0;
1564 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1565 int i;
1566
1567 for (i = 0; i < 4; i++) {
1568 if ((sin6->sin6_addr.s6_addr32[i] &
1569 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
1570 (ia->ia_addr.sin6_addr.s6_addr32[i] &
1571 ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
1572 break;
1573 }
1574 /* and, yeah, we need a multicast-capable iface too */
5bd4422e 1575 if (ia->ia_ifp != &sc->sc_if &&
0d16ba1d
MD
1576 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1577 (i == 4)) {
1578 if (!ia_if)
1579 ia_if = ia;
1580 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
1581 &ia->ia_addr.sin6_addr))
1582 own++;
1583 }
1584 }
1585
1586 if (!ia_if)
1587 return (EADDRNOTAVAIL);
1588 ia = ia_if;
1589 ifp = ia->ia_ifp;
1590
1591 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1592 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp))
1593 return (EADDRNOTAVAIL);
1594
1595 if (!sc->sc_naddrs6) {
1596 im6o->im6o_multicast_ifp = ifp;
1597
1598 /* join CARP multicast address */
1599 bzero(&in6, sizeof(in6));
1600 in6.s6_addr16[0] = htons(0xff02);
1601 in6.s6_addr8[15] = 0x12;
1602 if (in6_setscope(&in6, ifp, NULL) != 0)
1603 goto cleanup;
1604 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
1605 goto cleanup;
1606 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1607
1608 /* join solicited multicast address */
1609 bzero(&in6, sizeof(in6));
1610 in6.s6_addr16[0] = htons(0xff02);
1611 in6.s6_addr32[1] = 0;
1612 in6.s6_addr32[2] = htonl(1);
1613 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3];
1614 in6.s6_addr8[12] = 0xff;
1615 if (in6_setscope(&in6, ifp, NULL) != 0)
1616 goto cleanup;
1617 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
1618 goto cleanup;
1619 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1620 }
1621
1622 if (!ifp->if_carp) {
24c095f7 1623 cif = kmalloc(sizeof(*cif), M_CARP, M_WAITOK | M_ZERO);
5bd4422e 1624
0d16ba1d 1625 if ((error = ifpromisc(ifp, 1))) {
24c095f7 1626 kfree(cif, M_CARP);
0d16ba1d
MD
1627 goto cleanup;
1628 }
1629
0d16ba1d
MD
1630 TAILQ_INIT(&cif->vhif_vrs);
1631 ifp->if_carp = cif;
0d16ba1d
MD
1632 } else {
1633 struct carp_softc *vr;
1634
5bd4422e 1635 cif = ifp->if_carp;
84922d39 1636 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
0d16ba1d 1637 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
0d16ba1d
MD
1638 error = EINVAL;
1639 goto cleanup;
1640 }
84922d39 1641 }
0d16ba1d
MD
1642 }
1643 sc->sc_ia6 = ia;
1644 sc->sc_carpdev = ifp;
1645
1646 { /* XXX prevent endless loop if already in queue */
1647 struct carp_softc *vr, *after = NULL;
1648 int myself = 0;
5bd4422e 1649 cif = ifp->if_carp;
0d16ba1d
MD
1650
1651 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1652 if (vr == sc)
1653 myself = 1;
1654 if (vr->sc_vhid < sc->sc_vhid)
1655 after = vr;
1656 }
1657
1658 if (!myself) {
1659 /* We're trying to keep things in order */
84922d39 1660 if (after == NULL)
0d16ba1d 1661 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
84922d39 1662 else
0d16ba1d 1663 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
0d16ba1d
MD
1664 }
1665 }
1666
1667 sc->sc_naddrs6++;
0d16ba1d
MD
1668 if (own)
1669 sc->sc_advskew = 0;
5bd4422e 1670 carp_sc_state(sc);
0d16ba1d
MD
1671 carp_setrun(sc, 0);
1672
0d16ba1d
MD
1673 return (0);
1674
1675cleanup:
1676 /* clean up multicast memberships */
1677 if (!sc->sc_naddrs6) {
1678 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1679 imm = LIST_FIRST(&im6o->im6o_memberships);
1680 LIST_REMOVE(imm, i6mm_chain);
1681 in6_leavegroup(imm);
1682 }
1683 }
1684 return (error);
1685}
1686
1687static int
1688carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1689{
1690 int error = 0;
1691
1692 if (!--sc->sc_naddrs6) {
5bd4422e 1693 struct carp_if *cif = sc->sc_carpdev->if_carp;
0d16ba1d
MD
1694 struct ip6_moptions *im6o = &sc->sc_im6o;
1695
0d16ba1d 1696 callout_stop(&sc->sc_ad_tmo);
0d16ba1d
MD
1697 sc->sc_vhid = -1;
1698 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1699 struct in6_multi_mship *imm =
1700 LIST_FIRST(&im6o->im6o_memberships);
1701
1702 LIST_REMOVE(imm, i6mm_chain);
1703 in6_leavegroup(imm);
1704 }
1705 im6o->im6o_multicast_ifp = NULL;
1706 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
5bd4422e 1707 if (TAILQ_EMPTY(&cif->vhif_vrs)) {
0d16ba1d 1708 sc->sc_carpdev->if_carp = NULL;
24c095f7 1709 kfree(cif, M_IFADDR);
1fd4429c 1710 }
0d16ba1d 1711 }
0d16ba1d
MD
1712 return (error);
1713}
1714#endif /* INET6 */
1715
1716static int
84922d39 1717carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr, struct ucred *cr)
0d16ba1d
MD
1718{
1719 struct carp_softc *sc = ifp->if_softc, *vr;
1720 struct carpreq carpr;
1721 struct ifaddr *ifa;
1722 struct ifreq *ifr;
1723 struct ifaliasreq *ifra;
5bd4422e
SZ
1724 struct ifdrv *ifd;
1725 char devname[IFNAMSIZ];
48082acb 1726 int error = 0;
0d16ba1d
MD
1727
1728 ifa = (struct ifaddr *)addr;
1729 ifra = (struct ifaliasreq *)addr;
1730 ifr = (struct ifreq *)addr;
5bd4422e 1731 ifd = (struct ifdrv *)addr;
0d16ba1d 1732
0d16ba1d
MD
1733 switch (cmd) {
1734 case SIOCSIFADDR:
1735 switch (ifa->ifa_addr->sa_family) {
1736#ifdef INET
1737 case AF_INET:
5bd4422e 1738 ifp->if_flags |= IFF_UP | IFF_RUNNING;
0d16ba1d
MD
1739 break;
1740#endif /* INET */
1741#ifdef INET6
1742 case AF_INET6:
5bd4422e 1743 ifp->if_flags |= IFF_UP | IFF_RUNNING;
0d16ba1d
MD
1744 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr));
1745 break;
1746#endif /* INET6 */
1747 default:
1748 error = EAFNOSUPPORT;
1749 break;
1750 }
1751 break;
1752
1753 case SIOCAIFADDR:
1754 switch (ifa->ifa_addr->sa_family) {
1755#ifdef INET
1756 case AF_INET:
5bd4422e 1757 panic("SIOCAIFADDR should never be seen\n");
0d16ba1d
MD
1758#endif /* INET */
1759#ifdef INET6
1760 case AF_INET6:
5bd4422e 1761 ifp->if_flags |= IFF_UP | IFF_RUNNING;
0d16ba1d
MD
1762 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr));
1763 break;
1764#endif /* INET6 */
1765 default:
1766 error = EAFNOSUPPORT;
1767 break;
1768 }
1769 break;
1770
1771 case SIOCDIFADDR:
1772 switch (ifa->ifa_addr->sa_family) {
1773#ifdef INET
1774 case AF_INET:
5bd4422e 1775 panic("SIOCDIFADDR should never be seen\n");
0d16ba1d
MD
1776#endif /* INET */
1777#ifdef INET6
1778 case AF_INET6:
1779 error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr));
1780 break;
1781#endif /* INET6 */
1782 default:
1783 error = EAFNOSUPPORT;
1784 break;
1785 }
1786 break;
1787
1788 case SIOCSIFFLAGS:
5bd4422e
SZ
1789 if (ifp->if_flags & IFF_UP) {
1790 if ((ifp->if_flags & IFF_RUNNING) == 0) {
1791 ifp->if_flags |= IFF_RUNNING;
1792 carp_set_state(sc, INIT);
1793 carp_setrun(sc, 0);
1794 }
1795 } else if (ifp->if_flags & IFF_RUNNING) {
1796 carp_stop(sc, 0);
0d16ba1d
MD
1797 }
1798 break;
1799
1800 case SIOCSVH:
c6b34010 1801 error = suser_cred(cr, NULL_CRED_OKAY);
0d16ba1d
MD
1802 if (error)
1803 break;
5bd4422e
SZ
1804 error = copyin(ifr->ifr_data, &carpr, sizeof(carpr));
1805 if (error)
0d16ba1d 1806 break;
5bd4422e 1807
0d16ba1d 1808 error = 1;
5bd4422e
SZ
1809 if ((ifp->if_flags & IFF_RUNNING) &&
1810 sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) {
0d16ba1d
MD
1811 switch (carpr.carpr_state) {
1812 case BACKUP:
1813 callout_stop(&sc->sc_ad_tmo);
1814 carp_set_state(sc, BACKUP);
1815 carp_setrun(sc, 0);
1816 carp_setroute(sc, RTM_DELETE);
1817 break;
84922d39 1818
0d16ba1d 1819 case MASTER:
5bd4422e 1820 carp_master_down(sc);
0d16ba1d 1821 break;
84922d39 1822
0d16ba1d
MD
1823 default:
1824 break;
1825 }
1826 }
1827 if (carpr.carpr_vhid > 0) {
1828 if (carpr.carpr_vhid > 255) {
1829 error = EINVAL;
1830 break;
1831 }
1832 if (sc->sc_carpdev) {
5bd4422e
SZ
1833 struct carp_if *cif = sc->sc_carpdev->if_carp;
1834
84922d39 1835 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
0d16ba1d
MD
1836 if (vr != sc &&
1837 vr->sc_vhid == carpr.carpr_vhid)
1838 return EEXIST;
84922d39 1839 }
0d16ba1d
MD
1840 }
1841 sc->sc_vhid = carpr.carpr_vhid;
5bd4422e
SZ
1842 IF_LLADDR(ifp)[0] = 0;
1843 IF_LLADDR(ifp)[1] = 0;
1844 IF_LLADDR(ifp)[2] = 0x5e;
1845 IF_LLADDR(ifp)[3] = 0;
1846 IF_LLADDR(ifp)[4] = 1;
1847 IF_LLADDR(ifp)[5] = sc->sc_vhid;
0d16ba1d
MD
1848 error--;
1849 }
1850 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) {
1851 if (carpr.carpr_advskew >= 255) {
1852 error = EINVAL;
1853 break;
1854 }
1855 if (carpr.carpr_advbase > 255) {
1856 error = EINVAL;
1857 break;
1858 }
1859 sc->sc_advbase = carpr.carpr_advbase;
1860 sc->sc_advskew = carpr.carpr_advskew;
1861 error--;
1862 }
1863 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key));
84922d39 1864 if (error > 0) {
0d16ba1d 1865 error = EINVAL;
84922d39 1866 } else {
0d16ba1d
MD
1867 error = 0;
1868 carp_setrun(sc, 0);
1869 }
1870 break;
1871
1872 case SIOCGVH:
0d16ba1d
MD
1873 bzero(&carpr, sizeof(carpr));
1874 carpr.carpr_state = sc->sc_state;
1875 carpr.carpr_vhid = sc->sc_vhid;
1876 carpr.carpr_advbase = sc->sc_advbase;
1877 carpr.carpr_advskew = sc->sc_advskew;
5bd4422e 1878
c6b34010 1879 error = suser_cred(cr, NULL_CRED_OKAY);
84922d39 1880 if (error == 0) {
0d16ba1d 1881 bcopy(sc->sc_key, carpr.carpr_key,
5bd4422e 1882 sizeof(carpr.carpr_key));
84922d39 1883 }
5bd4422e 1884
0d16ba1d
MD
1885 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
1886 break;
1887
5bd4422e
SZ
1888 case SIOCGDRVSPEC:
1889 switch (ifd->ifd_cmd) {
1890 case CARPGDEVNAME:
1891 if (ifd->ifd_len != sizeof(devname))
1892 error = EINVAL;
1893 break;
1894
1895 case CARPGVHADDR:
1896 break;
1897
1898 default:
1899 error = EINVAL;
1900 break;
1901 }
1902 if (error)
1903 break;
1904
1905 switch (ifd->ifd_cmd) {
1906 case CARPGVHADDR:
1907 error = carp_get_vhaddr(sc, ifd);
1908 break;
1909
1910 case CARPGDEVNAME:
1911 bzero(devname, sizeof(devname));
1912 if (sc->sc_carpdev != NULL) {
1913 strlcpy(devname, sc->sc_carpdev->if_xname,
1914 sizeof(devname));
1915 }
1916 error = copyout(devname, ifd->ifd_data,
1917 sizeof(devname));
1918 break;
1919 }
1920 break;
1921
0d16ba1d
MD
1922 default:
1923 error = EINVAL;
5bd4422e 1924 break;
0d16ba1d 1925 }
0d16ba1d 1926 carp_hmac_prepare(sc);
5bd4422e 1927 return error;
0d16ba1d
MD
1928}
1929
1930/*
1931 * XXX: this is looutput. We should eventually use it from there.
1932 */
1933static int
1934carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
1935 struct rtentry *rt)
1936{
ab398e4b 1937 uint32_t af;
0d16ba1d
MD
1938
1939 M_ASSERTPKTHDR(m); /* check if we have the packet header */
1940
1941 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
1942 m_freem(m);
1943 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
1944 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
1945 }
1946
1947 ifp->if_opackets++;
1948 ifp->if_obytes += m->m_pkthdr.len;
1949
1950 /* BPF writes need to be handled specially. */
1951 if (dst->sa_family == AF_UNSPEC) {
1952 bcopy(dst->sa_data, &af, sizeof(af));
1953 dst->sa_family = af;
1954 }
1955
1956#if 1 /* XXX */
1957 switch (dst->sa_family) {
1958 case AF_INET:
1959 case AF_INET6:
1960 case AF_IPX:
1961 case AF_APPLETALK:
1962 break;
84922d39 1963
0d16ba1d
MD
1964 default:
1965 m_freem(m);
1966 return (EAFNOSUPPORT);
1967 }
1968#endif
84922d39 1969 return (if_simloop(ifp, m, dst->sa_family, 0));
0d16ba1d
MD
1970}
1971
1972/*
1973 * Start output on carp interface. This function should never be called.
1974 */
1975static void
1976carp_start(struct ifnet *ifp)
1977{
1978#ifdef DEBUG
1979 kprintf("%s: start called\n", ifp->if_xname);
1980#endif
1981}
1982
1983int
1984carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
1985 struct rtentry *rt)
1986{
1987 struct m_tag *mtag;
1988 struct carp_softc *sc;
1989 struct ifnet *carp_ifp;
84922d39 1990 struct ether_header *eh;
0d16ba1d
MD
1991
1992 if (!sa)
1993 return (0);
1994
1995 switch (sa->sa_family) {
1996#ifdef INET
1997 case AF_INET:
1998 break;
1999#endif /* INET */
2000#ifdef INET6
2001 case AF_INET6:
2002 break;
2003#endif /* INET6 */
2004 default:
2005 return (0);
2006 }
2007
2008 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL);
2009 if (mtag == NULL)
2010 return (0);
2011
2012 bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *));
2013 sc = carp_ifp->if_softc;
2014
2015 /* Set the source MAC address to Virtual Router MAC Address */
2016 switch (ifp->if_type) {
2017 case IFT_ETHER:
84922d39
SZ
2018 case IFT_L2VLAN:
2019 eh = mtod(m, struct ether_header *);
2020 eh->ether_shost[0] = 0;
2021 eh->ether_shost[1] = 0;
2022 eh->ether_shost[2] = 0x5e;
2023 eh->ether_shost[3] = 0;
2024 eh->ether_shost[4] = 1;
2025 eh->ether_shost[5] = sc->sc_vhid;
0d16ba1d 2026 break;
84922d39 2027
0d16ba1d 2028 default:
84922d39
SZ
2029 if_printf(ifp, "carp is not supported for this "
2030 "interface type\n");
0d16ba1d
MD
2031 return (EOPNOTSUPP);
2032 }
0d16ba1d 2033 return (0);
0d16ba1d
MD
2034}
2035
2036static void
2037carp_set_state(struct carp_softc *sc, int state)
2038{
5bd4422e
SZ
2039 struct ifnet *cifp = &sc->sc_if;
2040
0d16ba1d
MD
2041 if (sc->sc_state == state)
2042 return;
0d16ba1d 2043 sc->sc_state = state;
5bd4422e
SZ
2044
2045 switch (sc->sc_state) {
0d16ba1d 2046 case BACKUP:
5bd4422e 2047 cifp->if_link_state = LINK_STATE_DOWN;
0d16ba1d 2048 break;
84922d39 2049
0d16ba1d 2050 case MASTER:
5bd4422e 2051 cifp->if_link_state = LINK_STATE_UP;
0d16ba1d 2052 break;
84922d39 2053
0d16ba1d 2054 default:
5bd4422e 2055 cifp->if_link_state = LINK_STATE_UNKNOWN;
0d16ba1d
MD
2056 break;
2057 }
5bd4422e 2058 rt_ifmsg(cifp);
0d16ba1d
MD
2059}
2060
2061void
2062carp_carpdev_state(void *v)
2063{
2064 struct carp_if *cif = v;
0d16ba1d
MD
2065 struct carp_softc *sc;
2066
2067 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
5bd4422e 2068 carp_sc_state(sc);
0d16ba1d
MD
2069}
2070
2071static void
5bd4422e 2072carp_sc_state(struct carp_softc *sc)
0d16ba1d 2073{
84922d39 2074 if (!(sc->sc_carpdev->if_flags & IFF_UP)) {
0d16ba1d
MD
2075 callout_stop(&sc->sc_ad_tmo);
2076 callout_stop(&sc->sc_md_tmo);
2077 callout_stop(&sc->sc_md6_tmo);
2078 carp_set_state(sc, INIT);
2079 carp_setrun(sc, 0);
2080 if (!sc->sc_suppress) {
2081 carp_suppress_preempt++;
84922d39 2082 if (carp_suppress_preempt == 1)
0d16ba1d 2083 carp_send_ad_all();
0d16ba1d
MD
2084 }
2085 sc->sc_suppress = 1;
2086 } else {
0d16ba1d
MD
2087 carp_set_state(sc, INIT);
2088 carp_setrun(sc, 0);
2089 if (sc->sc_suppress)
2090 carp_suppress_preempt--;
2091 sc->sc_suppress = 0;
2092 }
0d16ba1d
MD
2093}
2094
5bd4422e
SZ
2095static void
2096carp_stop(struct carp_softc *sc, int detach)
2097{
2098 sc->sc_if.if_flags &= ~IFF_RUNNING;
2099
2100 callout_stop(&sc->sc_ad_tmo);
2101 callout_stop(&sc->sc_md_tmo);
2102 callout_stop(&sc->sc_md6_tmo);
2103
2104 if (!detach && sc->sc_state == MASTER)
2105 carp_send_ad(sc);
2106
2107 if (sc->sc_suppress)
2108 carp_suppress_preempt--;
2109 sc->sc_suppress = 0;
2110
2111 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
2112 carp_suppress_preempt--;
2113 sc->sc_sendad_errors = 0;
2114 sc->sc_sendad_success = 0;
2115
2116 carp_set_state(sc, INIT);
2117 carp_setrun(sc, 0);
2118}
2119
2120static void
2121carp_reset(struct carp_softc *sc, int detach)
2122{
2123 struct ifnet *cifp = &sc->sc_if;
2124
2125 carp_stop(sc, detach);
2126 if (!sc->sc_dead && (cifp->if_flags & IFF_UP))
2127 cifp->if_flags |= IFF_RUNNING;
2128}
2129
2130static int
2131carp_activate_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
2132 struct ifnet *ifp, const struct in_ifaddr *ia_if, int own)
2133{
2134 struct ip_moptions *imo = &sc->sc_imo;
2135 struct carp_if *cif;
2136 struct carp_softc *vr, *after = NULL;
2137 int onlist, error;
2138#ifdef INVARIANTS
2139 int assert_onlist;
2140#endif
2141
2142 KKASSERT(vha->vha_ia != NULL);
2143
2144 KASSERT(ia_if != NULL, ("NULL backing address\n"));
2145 KASSERT(vha->vha_iaback == NULL, ("%p is already activated\n", vha));
2146 KASSERT((vha->vha_flags & CARP_VHAF_OWNER) == 0,
2147 ("inactive vhaddr %p is the address owner\n", vha));
2148
2149 KASSERT(sc->sc_carpdev == NULL || sc->sc_carpdev == ifp,
2150 ("%s is already on %s\n", sc->sc_if.if_xname,
2151 sc->sc_carpdev->if_xname));
2152
2153 KASSERT(imo->imo_multicast_ifp == NULL ||
2154 imo->imo_multicast_ifp == ifp,
2155 ("%s didn't leave mcast group on %s\n",
2156 sc->sc_if.if_xname, imo->imo_multicast_ifp->if_xname));
2157
2158 if (imo->imo_num_memberships == 0) {
2159 struct in_addr addr;
2160
2161 addr.s_addr = htonl(INADDR_CARP_GROUP);
2162 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL)
2163 return ENOBUFS;
2164 imo->imo_num_memberships++;
2165 imo->imo_multicast_ifp = ifp;
2166 imo->imo_multicast_ttl = CARP_DFLTTL;
2167 imo->imo_multicast_loop = 0;
2168 }
2169
2170 if (!ifp->if_carp) {
2171 KASSERT(sc->sc_carpdev == NULL,
2172 ("%s is already on %s\n", sc->sc_if.if_xname,
2173 sc->sc_carpdev->if_xname));
2174
2175 cif = kmalloc(sizeof(*cif), M_CARP, M_WAITOK | M_ZERO);
2176
2177 error = ifpromisc(ifp, 1);
2178 if (error) {
2179 kfree(cif, M_CARP);
2180 goto cleanup;
2181 }
2182
2183 TAILQ_INIT(&cif->vhif_vrs);
2184 ifp->if_carp = cif;
2185 } else {
2186 cif = ifp->if_carp;
2187 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
2188 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
2189 error = EINVAL;
2190 goto cleanup;
2191 }
2192 }
2193 }
2194
2195#ifdef INVARIANTS
2196 if (sc->sc_carpdev != NULL)
2197 assert_onlist = 1;
2198 else
2199 assert_onlist = 0;
2200#endif
2201 sc->sc_ia = ia_if;
2202 sc->sc_carpdev = ifp;
2203
2204 cif = ifp->if_carp;
2205 onlist = 0;
2206 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
2207 if (vr == sc)
2208 onlist = 1;
2209 if (vr->sc_vhid < sc->sc_vhid)
2210 after = vr;
2211 }
2212
2213#ifdef INVARIANTS
2214 if (assert_onlist) {
2215 KASSERT(onlist, ("%s is not on %s carp list\n",
2216 sc->sc_if.if_xname, ifp->if_xname));
2217 } else {
2218 KASSERT(!onlist, ("%s is already on %s carp list\n",
2219 sc->sc_if.if_xname, ifp->if_xname));
2220 }
2221#endif
2222
2223 if (!onlist) {
2224 /* We're trying to keep things in order */
2225 if (after == NULL)
2226 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
2227 else
2228 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
2229 }
2230
2231 vha->vha_iaback = ia_if;
2232 sc->sc_naddrs++;
2233
2234 if (own) {
2235 vha->vha_flags |= CARP_VHAF_OWNER;
2236
2237 /* XXX save user configured advskew? */
2238 sc->sc_advskew = 0;
2239 }
2240
2241 carp_hmac_prepare(sc);
2242 carp_set_state(sc, INIT);
2243 carp_setrun(sc, 0);
2244 return 0;
2245cleanup:
2246 carp_multicast_cleanup(sc);
2247 return error;
2248}
2249
2250static void
2251carp_deactivate_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha)
2252{
2253 KKASSERT(vha->vha_ia != NULL);
2254
2255 carp_hmac_prepare(sc);
2256
2257 if (vha->vha_iaback == NULL) {
2258 KASSERT((vha->vha_flags & CARP_VHAF_OWNER) == 0,
2259 ("inactive vhaddr %p is the address owner\n", vha));
2260 return;
2261 }
2262
2263 vha->vha_flags &= ~CARP_VHAF_OWNER;
2264
2265 KKASSERT(sc->sc_naddrs > 0);
2266 vha->vha_iaback = NULL;
2267 sc->sc_naddrs--;
2268 if (!sc->sc_naddrs) {
2269 if (sc->sc_naddrs6) {
2270 carp_multicast_cleanup(sc);
2271 sc->sc_ia = NULL;
2272 } else {
2273 carp_detach(sc, 0);
2274 }
2275 }
2276}
2277
2278static void
2279carp_link_addrs(struct carp_softc *sc, struct ifnet *ifp, struct ifaddr *ifa_if)
2280{
2281 struct carp_vhaddr *vha;
2282 struct in_ifaddr *ia_if;
2283
2284 KKASSERT(ifa_if->ifa_addr->sa_family == AF_INET);
2285 ia_if = ifatoia(ifa_if);
2286
2287 if ((ia_if->ia_flags & IFA_ROUTE) == 0)
2288 return;
2289
2290 /*
2291 * Test each inactive vhaddr against the newly added address.
2292 * If the newly added address could be the backing address,
2293 * then activate the matching vhaddr.
2294 */
2295 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
2296 const struct in_ifaddr *ia;
2297 u_long iaddr;
2298 int own;
2299
2300 if (vha->vha_iaback != NULL)
2301 continue;
2302
2303 ia = vha->vha_ia;
2304 iaddr = ntohl(ia->ia_addr.sin_addr.s_addr);
2305
2306 if ((iaddr & ia_if->ia_subnetmask) != ia_if->ia_subnet)
2307 continue;
2308
2309 own = 0;
2310 if (ia->ia_addr.sin_addr.s_addr ==
2311 ia_if->ia_addr.sin_addr.s_addr)
2312 own = 1;
2313
2314 carp_activate_vhaddr(sc, vha, ifp, ia_if, own);
2315 }
2316}
2317
2318static void
2319carp_unlink_addrs(struct carp_softc *sc, struct ifnet *ifp,
2320 struct ifaddr *ifa_if)
2321{
2322 struct carp_vhaddr *vha;
2323 struct in_ifaddr *ia_if;
2324
2325 KKASSERT(ifa_if->ifa_addr->sa_family == AF_INET);
2326 ia_if = ifatoia(ifa_if);
2327
2328 /*
2329 * Ad src address is deleted; set it to NULL.
2330 * Following loop will try pick up a new ad src address
2331 * if one of the vhaddr could retain its backing address.
2332 */
2333 if (sc->sc_ia == ia_if)
2334 sc->sc_ia = NULL;
2335
2336 /*
2337 * Test each active vhaddr against the deleted address.
2338 * If the deleted address is vhaddr address's backing
2339 * address, then deactivate the vhaddr.
2340 */
2341 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
2342 if (vha->vha_iaback == NULL)
2343 continue;
2344
2345 if (vha->vha_iaback == ia_if)
2346 carp_deactivate_vhaddr(sc, vha);
2347 else if (sc->sc_ia == NULL)
2348 sc->sc_ia = vha->vha_iaback;
2349 }
2350}
2351
2352static void
2353carp_update_addrs(struct carp_softc *sc)
2354{
2355 struct carp_vhaddr *vha;
2356
2357 KKASSERT(sc->sc_carpdev == NULL);
2358
2359 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
2360 carp_config_vhaddr(sc, vha);
2361}
2362
2363static void
2364carp_ifaddr(void *arg __unused, struct ifnet *ifp,
2365 enum ifaddr_event event, struct ifaddr *ifa)
2366{
2367 struct carp_softc *sc;
2368
2369 if (ifa->ifa_addr->sa_family != AF_INET)
2370 return;
2371
2372 if (ifp->if_type == IFT_CARP) {
2373 /*
2374 * Address is changed on carp(4) interface
2375 */
2376 switch (event) {
2377 case IFADDR_EVENT_ADD:
2378 carp_add_addr(ifp->if_softc, ifa);
2379 break;
2380
2381 case IFADDR_EVENT_CHANGE:
2382 carp_config_addr(ifp->if_softc, ifa);
2383 break;
2384
2385 case IFADDR_EVENT_DELETE:
2386 carp_del_addr(ifp->if_softc, ifa);
2387 break;
2388 }
2389 return;
2390 }
2391
2392 /*
2393 * Address is changed on non-carp(4) interface
2394 */
2395 if ((ifp->if_flags & IFF_MULTICAST) == 0)
2396 return;
2397
2398 crit_enter();
2399 LIST_FOREACH(sc, &carpif_list, sc_next) {
2400 if (sc->sc_carpdev != NULL && sc->sc_carpdev != ifp) {
2401 /* Not the parent iface; skip */
2402 continue;
2403 }
2404
2405 switch (event) {
2406 case IFADDR_EVENT_ADD:
2407 carp_link_addrs(sc, ifp, ifa);
2408 break;
2409
2410 case IFADDR_EVENT_DELETE:
2411 if (sc->sc_carpdev != NULL) {
2412 carp_unlink_addrs(sc, ifp, ifa);
2413 if (sc->sc_carpdev == NULL)
2414 carp_update_addrs(sc);
2415 } else {
2416 /*
2417 * The carp(4) interface didn't have a
2418 * parent iface, so it is not possible
2419 * that it will contain any address to
2420 * be unlinked.
2421 */
2422 }
2423 break;
2424
2425 case IFADDR_EVENT_CHANGE:
2426 if (sc->sc_carpdev == NULL) {
2427 /*
2428 * The carp(4) interface didn't have a
2429 * parent iface, so it is not possible
2430 * that it will contain any address to
2431 * be updated.
2432 */
2433 carp_link_addrs(sc, ifp, ifa);
2434 } else {
2435 /*
2436 * First try breaking tie with the old
2437 * address. Then see whether we could
2438 * link certain vhaddr to the new address.
2439 * If that fails, i.e. carpdev is NULL,
2440 * we try a global update.
2441 *
2442 * NOTE: The above order is critical.
2443 */
2444 carp_unlink_addrs(sc, ifp, ifa);
2445 carp_link_addrs(sc, ifp, ifa);
2446 if (sc->sc_carpdev == NULL)
2447 carp_update_addrs(sc);
2448 }
2449 break;
2450 }
2451 }
2452 crit_exit();
2453}
2454
0d16ba1d
MD
2455static int
2456carp_modevent(module_t mod, int type, void *data)
2457{
2458 switch (type) {
2459 case MOD_LOAD:
0d16ba1d 2460 LIST_INIT(&carpif_list);
2d8547d8
SZ
2461 carp_ifdetach_event =
2462 EVENTHANDLER_REGISTER(ifnet_detach_event, carp_ifdetach, NULL,
2463 EVENTHANDLER_PRI_ANY);
5bd4422e
SZ
2464 carp_ifaddr_event =
2465 EVENTHANDLER_REGISTER(ifaddr_event, carp_ifaddr, NULL,
2466 EVENTHANDLER_PRI_ANY);
0d16ba1d
MD
2467 if_clone_attach(&carp_cloner);
2468 break;
2469
2470 case MOD_UNLOAD:
2d8547d8
SZ
2471 EVENTHANDLER_DEREGISTER(ifnet_detach_event,
2472 carp_ifdetach_event);
5bd4422e
SZ
2473 EVENTHANDLER_DEREGISTER(ifaddr_event,
2474 carp_ifaddr_event);
0d16ba1d
MD
2475 if_clone_detach(&carp_cloner);
2476 break;
2477
2478 default:
2479 return (EINVAL);
2480 }
0d16ba1d
MD
2481 return (0);
2482}
2483
2484static moduledata_t carp_mod = {
2485 "carp",
2486 carp_modevent,
2487 0
2488};
0d16ba1d 2489DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);