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5435a2bf | 1 | /* |
63d4bd12 QY |
2 | * VRRP global definitions and state machine. |
3 | * Copyright (C) 2018-2019 Cumulus Networks, Inc. | |
4 | * Quentin Young | |
5435a2bf QY |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the Free | |
8 | * Software Foundation; either version 2 of the License, or (at your option) | |
9 | * any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | * more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
41ee5442 QY |
20 | #include <zebra.h> |
21 | ||
862f2f37 QY |
22 | #include "lib/hash.h" |
23 | #include "lib/hook.h" | |
40744000 QY |
24 | #include "lib/if.h" |
25 | #include "lib/linklist.h" | |
862f2f37 | 26 | #include "lib/memory.h" |
91188ca6 | 27 | #include "lib/network.h" |
40744000 | 28 | #include "lib/prefix.h" |
862f2f37 | 29 | #include "lib/sockopt.h" |
dad18a2f | 30 | #include "lib/sockunion.h" |
40744000 | 31 | #include "lib/vrf.h" |
5435a2bf QY |
32 | |
33 | #include "vrrp.h" | |
40744000 | 34 | #include "vrrp_arp.h" |
72df9d93 | 35 | #include "vrrp_memory.h" |
4f52e9a6 | 36 | #include "vrrp_ndisc.h" |
247aa469 | 37 | #include "vrrp_packet.h" |
f3fe0047 | 38 | #include "vrrp_zebra.h" |
5435a2bf | 39 | |
4ec94408 QY |
40 | #define VRRP_LOGPFX "[CORE] " |
41 | ||
27fd8827 QY |
42 | /* statics */ |
43 | struct hash *vrrp_vrouters_hash; | |
44 | bool vrrp_autoconfig_is_on; | |
45 | int vrrp_autoconfig_version; | |
46 | ||
4ec94408 QY |
47 | const char *vrrp_state_names[3] = { |
48 | [VRRP_STATE_INITIALIZE] = "Initialize", | |
49 | [VRRP_STATE_MASTER] = "Master", | |
50 | [VRRP_STATE_BACKUP] = "Backup", | |
51 | }; | |
52 | ||
53 | const char *vrrp_event_names[2] = { | |
54 | [VRRP_EVENT_STARTUP] = "Startup", | |
55 | [VRRP_EVENT_SHUTDOWN] = "Shutdown", | |
56 | }; | |
57 | ||
58 | ||
5435a2bf QY |
59 | /* Utility functions ------------------------------------------------------- */ |
60 | ||
61 | /* | |
62 | * Sets an ethaddr to RFC-defined Virtual Router MAC address. | |
63 | * | |
64 | * mac | |
65 | * ethaddr to set | |
66 | * | |
67 | * v6 | |
68 | * Whether this is a V6 or V4 Virtual Router MAC | |
69 | * | |
70 | * vrid | |
71 | * Virtual Router Identifier | |
72 | */ | |
73 | static void vrrp_mac_set(struct ethaddr *mac, bool v6, uint8_t vrid) | |
74 | { | |
75 | /* | |
76 | * V4: 00-00-5E-00-01-{VRID} | |
77 | * V6: 00-00-5E-00-02-{VRID} | |
78 | */ | |
79 | mac->octet[0] = 0x00; | |
80 | mac->octet[1] = 0x00; | |
81 | mac->octet[2] = 0x5E; | |
82 | mac->octet[3] = 0x00; | |
83 | mac->octet[4] = v6 ? 0x02 : 0x01; | |
84 | mac->octet[5] = vrid; | |
85 | } | |
86 | ||
1d21789e | 87 | /* |
862f2f37 | 88 | * Recalculates and sets skew_time and master_down_interval based |
1d21789e QY |
89 | * values. |
90 | * | |
862f2f37 QY |
91 | * r |
92 | * VRRP Router to operate on | |
1d21789e | 93 | */ |
862f2f37 | 94 | static void vrrp_recalculate_timers(struct vrrp_router *r) |
1d21789e | 95 | { |
2884f9bb QY |
96 | uint16_t skm = (r->vr->version == 3) ? r->master_adver_interval : 1; |
97 | r->skew_time = ((256 - r->vr->priority) * skm) / 256; | |
862f2f37 QY |
98 | r->master_down_interval = (3 * r->master_adver_interval); |
99 | r->master_down_interval += r->skew_time; | |
1d21789e QY |
100 | } |
101 | ||
5d3730c5 QY |
102 | /* |
103 | * Determines if a VRRP router is the owner of the specified address. | |
104 | * | |
dad18a2f QY |
105 | * The determining factor for whether an interface is the address owner is |
106 | * simply whether the address is assigned to the VRRP subinterface by someone | |
107 | * other than vrrpd. | |
108 | * | |
109 | * This function should always return the correct answer regardless of | |
110 | * master/backup status. | |
111 | * | |
5d3730c5 | 112 | * vr |
862f2f37 | 113 | * Virtual Router |
5d3730c5 QY |
114 | * |
115 | * Returns: | |
116 | * whether or not vr owns the specified address | |
117 | */ | |
7e205b4a | 118 | static bool vrrp_is_owner(struct interface *ifp, struct ipaddr *addr) |
5d3730c5 | 119 | { |
7e205b4a | 120 | struct prefix p; |
5d3730c5 | 121 | |
7e205b4a QY |
122 | p.family = IS_IPADDR_V4(addr) ? AF_INET : AF_INET6; |
123 | p.prefixlen = IS_IPADDR_V4(addr) ? IPV4_MAX_BITLEN : IPV6_MAX_BITLEN; | |
124 | memcpy(&p.u, &addr->ip, sizeof(addr->ip)); | |
dad18a2f | 125 | |
7e205b4a | 126 | return !!connected_lookup_prefix_exact(ifp, &p); |
5d3730c5 QY |
127 | } |
128 | ||
1d21789e QY |
129 | /* Configuration controllers ----------------------------------------------- */ |
130 | ||
131 | void vrrp_set_priority(struct vrrp_vrouter *vr, uint8_t priority) | |
c23edd74 | 132 | { |
862f2f37 | 133 | vr->priority = priority; |
bac08ded QY |
134 | vr->v4->priority = priority; |
135 | vr->v6->priority = priority; | |
c23edd74 QY |
136 | } |
137 | ||
1d21789e QY |
138 | void vrrp_set_advertisement_interval(struct vrrp_vrouter *vr, |
139 | uint16_t advertisement_interval) | |
140 | { | |
141 | if (vr->advertisement_interval == advertisement_interval) | |
142 | return; | |
143 | ||
862f2f37 QY |
144 | vr->advertisement_interval = advertisement_interval; |
145 | vrrp_recalculate_timers(vr->v4); | |
146 | vrrp_recalculate_timers(vr->v6); | |
147 | } | |
148 | ||
2cd90902 | 149 | static bool vrrp_has_ip(struct vrrp_vrouter *vr, struct ipaddr *ip) |
862f2f37 | 150 | { |
2cd90902 QY |
151 | struct vrrp_router *r = ip->ipa_type == IPADDR_V4 ? vr->v4 : vr->v6; |
152 | struct listnode *ln; | |
153 | struct ipaddr *iter; | |
862f2f37 | 154 | |
2cd90902 | 155 | for (ALL_LIST_ELEMENTS_RO(r->addrs, ln, iter)) |
e920b0b2 | 156 | if (!memcmp(&iter->ip, &ip->ip, IPADDRSZ(ip))) |
2cd90902 | 157 | return true; |
10133a59 | 158 | |
2cd90902 QY |
159 | return false; |
160 | } | |
161 | ||
162 | int vrrp_add_ip(struct vrrp_router *r, struct ipaddr *ip, bool activate) | |
163 | { | |
27fd8827 QY |
164 | int af = (ip->ipa_type == IPADDR_V6) ? AF_INET6 : AF_INET; |
165 | ||
166 | assert(r->family == af); | |
167 | ||
2cd90902 QY |
168 | if (vrrp_has_ip(r->vr, ip)) |
169 | return 0; | |
170 | ||
171 | if (!vrrp_is_owner(r->vr->ifp, ip) && r->is_owner) { | |
10133a59 | 172 | char ipbuf[INET6_ADDRSTRLEN]; |
2cd90902 | 173 | inet_ntop(r->family, &ip->ip, ipbuf, sizeof(ipbuf)); |
10133a59 QY |
174 | zlog_err( |
175 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
176 | "This VRRP router is not the address owner of %s, but is the address owner of other addresses; this config is unsupported.", | |
2cd90902 QY |
177 | r->vr->vrid, ipbuf); |
178 | return -1; | |
10133a59 QY |
179 | } |
180 | ||
72df9d93 | 181 | struct ipaddr *new = XCALLOC(MTYPE_VRRP_IP, sizeof(struct ipaddr)); |
2cd90902 QY |
182 | |
183 | *new = *ip; | |
184 | listnode_add(r->addrs, new); | |
185 | ||
186 | bool do_activate = (activate && r->fsm.state == VRRP_STATE_INITIALIZE); | |
187 | int ret = 0; | |
188 | ||
27fd8827 | 189 | if (do_activate) { |
2cd90902 | 190 | ret = vrrp_event(r, VRRP_EVENT_STARTUP); |
27fd8827 QY |
191 | if (ret) |
192 | listnode_delete(r->addrs, new); | |
193 | } | |
2cd90902 QY |
194 | else if (r->fsm.state == VRRP_STATE_MASTER) { |
195 | switch (r->family) { | |
196 | case AF_INET: | |
197 | vrrp_garp_send(r, &new->ipaddr_v4); | |
198 | break; | |
199 | case AF_INET6: | |
200 | vrrp_ndisc_una_send(r, new); | |
201 | break; | |
202 | } | |
203 | } | |
204 | ||
205 | return ret; | |
206 | } | |
207 | ||
208 | int vrrp_add_ipv4(struct vrrp_vrouter *vr, struct in_addr v4, bool activate) | |
209 | { | |
210 | struct ipaddr ip; | |
211 | ip.ipa_type = IPADDR_V4; | |
212 | ip.ipaddr_v4 = v4; | |
213 | return vrrp_add_ip(vr->v4, &ip, activate); | |
214 | } | |
215 | ||
216 | int vrrp_add_ipv6(struct vrrp_vrouter *vr, struct in6_addr v6, bool activate) | |
217 | { | |
218 | struct ipaddr ip; | |
219 | ip.ipa_type = IPADDR_V6; | |
220 | ip.ipaddr_v6 = v6; | |
221 | return vrrp_add_ip(vr->v6, &ip, activate); | |
1d21789e QY |
222 | } |
223 | ||
2cd90902 | 224 | int vrrp_del_ip(struct vrrp_router *r, struct ipaddr *ip, bool deactivate) |
c23edd74 | 225 | { |
2cd90902 QY |
226 | struct listnode *ln, *nn; |
227 | struct ipaddr *iter; | |
228 | int ret = 0; | |
c23edd74 | 229 | |
2cd90902 QY |
230 | if (!vrrp_has_ip(r->vr, ip)) |
231 | return 0; | |
10133a59 | 232 | |
2cd90902 QY |
233 | if (deactivate && r->addrs->count == 1 |
234 | && r->fsm.state != VRRP_STATE_INITIALIZE) | |
235 | ret = vrrp_event(r, VRRP_EVENT_SHUTDOWN); | |
236 | ||
237 | /* | |
238 | * Don't delete IP if we failed to deactivate, otherwise we'll run into | |
239 | * issues later trying to build a VRRP advertisement with no IPs | |
240 | */ | |
241 | if (ret == 0) { | |
242 | for (ALL_LIST_ELEMENTS(r->addrs, ln, nn, iter)) | |
e920b0b2 | 243 | if (!memcmp(&iter->ip, &ip->ip, IPADDRSZ(ip))) |
2cd90902 | 244 | list_delete_node(r->addrs, ln); |
10133a59 QY |
245 | } |
246 | ||
2cd90902 QY |
247 | return ret; |
248 | } | |
4f52e9a6 | 249 | |
2cd90902 QY |
250 | int vrrp_del_ipv6(struct vrrp_vrouter *vr, struct in6_addr v6, bool deactivate) |
251 | { | |
252 | struct ipaddr ip; | |
253 | ip.ipa_type = IPADDR_V6; | |
254 | ip.ipaddr_v6 = v6; | |
255 | return vrrp_del_ip(vr->v6, &ip, deactivate); | |
862f2f37 QY |
256 | } |
257 | ||
2cd90902 | 258 | int vrrp_del_ipv4(struct vrrp_vrouter *vr, struct in_addr v4, bool deactivate) |
862f2f37 | 259 | { |
2cd90902 QY |
260 | struct ipaddr ip; |
261 | ip.ipa_type = IPADDR_V4; | |
262 | ip.ipaddr_v4 = v4; | |
263 | return vrrp_del_ip(vr->v4, &ip, deactivate); | |
c23edd74 QY |
264 | } |
265 | ||
1d21789e QY |
266 | |
267 | /* Creation and destruction ------------------------------------------------ */ | |
268 | ||
6287cefe QY |
269 | static void vrrp_router_addr_list_del_cb(void *val) |
270 | { | |
271 | struct ipaddr *ip = val; | |
72df9d93 | 272 | XFREE(MTYPE_VRRP_IP, ip); |
6287cefe QY |
273 | } |
274 | ||
85467974 QY |
275 | /* |
276 | * Search for a suitable macvlan subinterface we can attach to, and if found, | |
277 | * attach to it. | |
278 | * | |
279 | * r | |
280 | * Router to attach to interface | |
281 | * | |
282 | * Returns: | |
283 | * Whether an interface was successfully attached | |
284 | */ | |
285 | static bool vrrp_attach_interface(struct vrrp_router *r) | |
862f2f37 | 286 | { |
dad18a2f QY |
287 | /* Search for existing interface with computed MAC address */ |
288 | struct interface **ifps; | |
289 | size_t ifps_cnt = if_lookup_by_hwaddr( | |
290 | r->vmac.octet, sizeof(r->vmac.octet), &ifps, VRF_DEFAULT); | |
291 | ||
292 | /* | |
1b1f3c43 QY |
293 | * Filter to only those macvlan interfaces whose parent is the base |
294 | * interface this VRRP router is configured on. | |
dad18a2f QY |
295 | * |
296 | * If there are still multiple interfaces we just select the first one, | |
297 | * as it should be functionally identical to the others. | |
298 | */ | |
299 | unsigned int candidates = 0; | |
300 | struct interface *selection = NULL; | |
301 | for (unsigned int i = 0; i < ifps_cnt; i++) { | |
1b1f3c43 QY |
302 | if (ifps[i]->link_ifindex != r->vr->ifp->ifindex |
303 | || !CHECK_FLAG(ifps[i]->flags, IFF_UP)) | |
dad18a2f QY |
304 | ifps[i] = NULL; |
305 | else { | |
306 | selection = selection ? selection : ifps[i]; | |
307 | candidates++; | |
308 | } | |
309 | } | |
310 | ||
b79640e4 QY |
311 | if (ifps_cnt) |
312 | XFREE(MTYPE_TMP, ifps); | |
dad18a2f QY |
313 | |
314 | char ethstr[ETHER_ADDR_STRLEN]; | |
315 | prefix_mac2str(&r->vmac, ethstr, sizeof(ethstr)); | |
316 | ||
317 | assert(!!selection == !!candidates); | |
318 | ||
319 | if (candidates == 0) | |
320 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
85467974 | 321 | "No interface found w/ MAC %s", |
dad18a2f QY |
322 | r->vr->vrid, ethstr); |
323 | else if (candidates > 1) | |
324 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
325 | "Multiple VRRP interfaces found; using %s", | |
326 | r->vr->vrid, selection->name); | |
327 | else | |
328 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID "Selected %s", | |
329 | r->vr->vrid, selection->name); | |
330 | ||
7e205b4a | 331 | r->mvl_ifp = selection; |
dad18a2f | 332 | |
85467974 QY |
333 | return !!r->mvl_ifp; |
334 | ||
335 | } | |
336 | ||
337 | static struct vrrp_router *vrrp_router_create(struct vrrp_vrouter *vr, | |
338 | int family) | |
339 | { | |
72df9d93 QY |
340 | struct vrrp_router *r = |
341 | XCALLOC(MTYPE_VRRP_RTR, sizeof(struct vrrp_router)); | |
85467974 QY |
342 | |
343 | r->family = family; | |
344 | r->sock_rx = -1; | |
345 | r->sock_tx = -1; | |
346 | r->vr = vr; | |
347 | r->addrs = list_new(); | |
348 | r->addrs->del = vrrp_router_addr_list_del_cb; | |
349 | r->priority = vr->priority; | |
350 | r->fsm.state = VRRP_STATE_INITIALIZE; | |
351 | vrrp_mac_set(&r->vmac, family == AF_INET6, vr->vrid); | |
352 | ||
353 | vrrp_attach_interface(r); | |
354 | ||
862f2f37 QY |
355 | return r; |
356 | } | |
357 | ||
358 | static void vrrp_router_destroy(struct vrrp_router *r) | |
359 | { | |
6287cefe QY |
360 | if (r->is_active) |
361 | vrrp_event(r, VRRP_EVENT_SHUTDOWN); | |
362 | ||
dad18a2f QY |
363 | if (r->sock_rx >= 0) |
364 | close(r->sock_rx); | |
365 | if (r->sock_tx >= 0) | |
366 | close(r->sock_tx); | |
6287cefe | 367 | |
862f2f37 QY |
368 | /* FIXME: also delete list elements */ |
369 | list_delete(&r->addrs); | |
72df9d93 | 370 | XFREE(MTYPE_VRRP_RTR, r); |
862f2f37 QY |
371 | } |
372 | ||
99966840 QY |
373 | struct vrrp_vrouter *vrrp_vrouter_create(struct interface *ifp, uint8_t vrid, |
374 | uint8_t version) | |
5435a2bf | 375 | { |
4f0b6b45 | 376 | struct vrrp_vrouter *vr = vrrp_lookup(ifp, vrid); |
6287cefe QY |
377 | |
378 | if (vr) | |
379 | return vr; | |
380 | ||
99966840 QY |
381 | if (version != 2 && version != 3) |
382 | return NULL; | |
383 | ||
72df9d93 | 384 | vr = XCALLOC(MTYPE_VRRP_RTR, sizeof(struct vrrp_vrouter)); |
5435a2bf | 385 | |
5435a2bf | 386 | vr->ifp = ifp; |
99966840 | 387 | vr->version = version; |
5435a2bf | 388 | vr->vrid = vrid; |
5435a2bf | 389 | vr->priority = VRRP_DEFAULT_PRIORITY; |
5435a2bf QY |
390 | vr->preempt_mode = true; |
391 | vr->accept_mode = false; | |
862f2f37 QY |
392 | |
393 | vr->v4 = vrrp_router_create(vr, AF_INET); | |
394 | vr->v6 = vrrp_router_create(vr, AF_INET6); | |
395 | ||
1485d9e5 | 396 | vrrp_set_advertisement_interval(vr, VRRP_DEFAULT_ADVINT); |
5435a2bf QY |
397 | |
398 | hash_get(vrrp_vrouters_hash, vr, hash_alloc_intern); | |
399 | ||
400 | return vr; | |
401 | } | |
402 | ||
c23edd74 QY |
403 | void vrrp_vrouter_destroy(struct vrrp_vrouter *vr) |
404 | { | |
862f2f37 QY |
405 | vrrp_router_destroy(vr->v4); |
406 | vrrp_router_destroy(vr->v6); | |
c23edd74 | 407 | hash_release(vrrp_vrouters_hash, vr); |
72df9d93 | 408 | XFREE(MTYPE_VRRP_RTR, vr); |
c23edd74 QY |
409 | } |
410 | ||
4f0b6b45 | 411 | struct vrrp_vrouter *vrrp_lookup(struct interface *ifp, uint8_t vrid) |
5435a2bf QY |
412 | { |
413 | struct vrrp_vrouter vr; | |
414 | vr.vrid = vrid; | |
4f0b6b45 | 415 | vr.ifp = ifp; |
5435a2bf QY |
416 | |
417 | return hash_lookup(vrrp_vrouters_hash, &vr); | |
418 | } | |
419 | ||
420 | /* Network ----------------------------------------------------------------- */ | |
421 | ||
10133a59 QY |
422 | /* Forward decls */ |
423 | static void vrrp_change_state(struct vrrp_router *r, int to); | |
424 | static int vrrp_adver_timer_expire(struct thread *thread); | |
425 | static int vrrp_master_down_timer_expire(struct thread *thread); | |
426 | ||
5435a2bf | 427 | /* |
91188ca6 | 428 | * Create and multicast a VRRP ADVERTISEMENT message. |
5435a2bf | 429 | * |
862f2f37 QY |
430 | * r |
431 | * VRRP Router for which to send ADVERTISEMENT | |
5435a2bf | 432 | */ |
862f2f37 | 433 | static void vrrp_send_advertisement(struct vrrp_router *r) |
5435a2bf | 434 | { |
247aa469 | 435 | struct vrrp_pkt *pkt; |
d9e01e1c | 436 | ssize_t pktsz; |
862f2f37 QY |
437 | struct ipaddr *addrs[r->addrs->count]; |
438 | union sockunion dest; | |
247aa469 | 439 | |
862f2f37 | 440 | list_to_array(r->addrs, (void **)addrs, r->addrs->count); |
247aa469 | 441 | |
99966840 QY |
442 | pktsz = vrrp_pkt_adver_build(&pkt, &r->src, r->vr->version, r->vr->vrid, |
443 | r->priority, r->vr->advertisement_interval, | |
d9e01e1c | 444 | r->addrs->count, (struct ipaddr **)&addrs); |
247aa469 | 445 | |
d9e01e1c QY |
446 | if (pktsz > 0) |
447 | zlog_hexdump(pkt, (size_t) pktsz); | |
247aa469 QY |
448 | else |
449 | zlog_warn("Could not build VRRP packet"); | |
450 | ||
862f2f37 QY |
451 | const char *group = |
452 | r->family == AF_INET ? VRRP_MCASTV4_GROUP_STR : VRRP_MCASTV6_GROUP_STR; | |
453 | str2sockunion(group, &dest); | |
247aa469 | 454 | |
d9e01e1c | 455 | ssize_t sent = sendto(r->sock_tx, pkt, (size_t)pktsz, 0, &dest.sa, |
862f2f37 | 456 | sockunion_sizeof(&dest)); |
4ec94408 | 457 | |
72df9d93 | 458 | XFREE(MTYPE_VRRP_PKT, pkt); |
bb54fa3a | 459 | |
4ec94408 QY |
460 | if (sent < 0) { |
461 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
8071d5c3 QY |
462 | "Failed to send VRRP Advertisement: %s", |
463 | r->vr->vrid, safe_strerror(errno)); | |
4ec94408 | 464 | } |
5435a2bf QY |
465 | } |
466 | ||
10133a59 QY |
467 | /* |
468 | * Receive and parse VRRP advertisement. | |
469 | * | |
470 | * By the time we get here all fields have been validated for basic correctness | |
471 | * and the packet is a valid VRRP packet. | |
472 | * | |
473 | * However, we have not validated whether the VRID is correct for this virtual | |
474 | * router, nor whether the priority is correct (i.e. is not 255 when we are the | |
99966840 QY |
475 | * address owner), nor whether the advertisement interval equals our own |
476 | * configured value (this check is only performed in VRRPv2). | |
0f1f98e8 QY |
477 | * |
478 | * r | |
479 | * VRRP Router associated with the socket this advertisement was received on | |
480 | * | |
481 | * src | |
482 | * Source address of sender | |
483 | * | |
484 | * pkt | |
485 | * The advertisement they sent | |
486 | * | |
487 | * pktsize | |
488 | * Size of advertisement | |
489 | * | |
490 | * Returns: | |
491 | * -1 if advertisement is invalid | |
492 | * 0 otherwise | |
10133a59 | 493 | */ |
0f1f98e8 QY |
494 | static int vrrp_recv_advertisement(struct vrrp_router *r, struct ipaddr *src, |
495 | struct vrrp_pkt *pkt, size_t pktsize) | |
5435a2bf | 496 | { |
3708883c QY |
497 | char sipstr[INET6_ADDRSTRLEN]; |
498 | ipaddr2str(src, sipstr, sizeof(sipstr)); | |
499 | ||
91188ca6 | 500 | char dumpbuf[BUFSIZ]; |
d9e01e1c | 501 | vrrp_pkt_adver_dump(dumpbuf, sizeof(dumpbuf), pkt); |
3708883c QY |
502 | zlog_debug(VRRP_LOGPFX VRRP_LOGPFX_VRID |
503 | "Received VRRP Advertisement from %s:\n%s", | |
504 | r->vr->vrid, sipstr, dumpbuf); | |
10133a59 QY |
505 | |
506 | /* Check that VRID matches our configured VRID */ | |
507 | if (pkt->hdr.vrid != r->vr->vrid) { | |
508 | zlog_warn( | |
509 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
510 | "%s datagram invalid: Advertisement contains VRID %" PRIu8 | |
511 | " which does not match our instance", | |
512 | r->vr->vrid, family2str(r->family), pkt->hdr.vrid); | |
513 | return -1; | |
514 | } | |
515 | ||
516 | /* Verify that we are not the IPvX address owner */ | |
517 | if (r->is_owner) { | |
518 | zlog_warn( | |
519 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
520 | "%s datagram invalid: Received advertisement but we are the address owner", | |
521 | r->vr->vrid, family2str(r->family)); | |
522 | return -1; | |
523 | } | |
524 | ||
99966840 QY |
525 | /* If v2, verify that adver time matches ours */ |
526 | bool adveq = (pkt->hdr.v2.adver_int | |
527 | == MAX(r->vr->advertisement_interval / 100, 1)); | |
528 | if (r->vr->version == 2 && !adveq) { | |
529 | zlog_warn( | |
530 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
531 | "%s datagram invalid: Received advertisement with advertisement interval %" PRIu8 | |
532 | " unequal to our configured value %u", | |
533 | r->vr->vrid, family2str(r->family), | |
534 | pkt->hdr.v2.adver_int, | |
535 | MAX(r->vr->advertisement_interval / 100, 1)); | |
536 | return -1; | |
537 | } | |
538 | ||
539 | ||
10133a59 QY |
540 | /* Check that # IPs received matches our # configured IPs */ |
541 | if (pkt->hdr.naddr != r->addrs->count) { | |
542 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
543 | "%s datagram has %" PRIu8 | |
544 | " addresses, but this VRRP instance has %u", | |
545 | r->vr->vrid, family2str(r->family), pkt->hdr.naddr, | |
546 | r->addrs->count); | |
99966840 | 547 | } |
10133a59 | 548 | |
0f1f98e8 | 549 | int addrcmp; |
0f1f98e8 | 550 | |
10133a59 QY |
551 | switch (r->fsm.state) { |
552 | case VRRP_STATE_MASTER: | |
e920b0b2 | 553 | addrcmp = memcmp(&src->ip, &r->src.ip, IPADDRSZ(src)); |
0f1f98e8 | 554 | |
10133a59 QY |
555 | if (pkt->hdr.priority == 0) { |
556 | vrrp_send_advertisement(r); | |
557 | THREAD_OFF(r->t_adver_timer); | |
558 | thread_add_timer_msec( | |
559 | master, vrrp_adver_timer_expire, r, | |
560 | r->vr->advertisement_interval * 10, | |
561 | &r->t_adver_timer); | |
0f1f98e8 QY |
562 | } else if (pkt->hdr.priority > r->priority |
563 | || ((pkt->hdr.priority == r->priority) && addrcmp > 0)) { | |
3708883c QY |
564 | zlog_info( |
565 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
566 | "Received advertisement from %s w/ priority %" PRIu8 | |
567 | "; switching to Backup", | |
568 | r->vr->vrid, sipstr, pkt->hdr.priority); | |
10133a59 | 569 | THREAD_OFF(r->t_adver_timer); |
99966840 QY |
570 | if (r->vr->version == 3) { |
571 | r->master_adver_interval = | |
572 | htons(pkt->hdr.v3.adver_int); | |
573 | } | |
10133a59 QY |
574 | vrrp_recalculate_timers(r); |
575 | THREAD_OFF(r->t_master_down_timer); | |
576 | thread_add_timer_msec(master, | |
577 | vrrp_master_down_timer_expire, r, | |
578 | r->master_down_interval * 10, | |
579 | &r->t_master_down_timer); | |
580 | vrrp_change_state(r, VRRP_STATE_BACKUP); | |
581 | } else { | |
582 | /* Discard advertisement */ | |
3708883c QY |
583 | zlog_debug(VRRP_LOGPFX VRRP_LOGPFX_VRID |
584 | "Discarding advertisement from %s", | |
585 | r->vr->vrid, sipstr); | |
10133a59 QY |
586 | } |
587 | break; | |
588 | case VRRP_STATE_BACKUP: | |
589 | if (pkt->hdr.priority == 0) { | |
590 | THREAD_OFF(r->t_master_down_timer); | |
591 | thread_add_timer_msec( | |
592 | master, vrrp_master_down_timer_expire, r, | |
593 | r->skew_time * 10, &r->t_master_down_timer); | |
594 | } else if (r->vr->preempt_mode == false | |
595 | || pkt->hdr.priority >= r->priority) { | |
99966840 QY |
596 | if (r->vr->version == 3) { |
597 | r->master_adver_interval = | |
598 | ntohs(pkt->hdr.v3.adver_int); | |
599 | } | |
10133a59 QY |
600 | vrrp_recalculate_timers(r); |
601 | THREAD_OFF(r->t_master_down_timer); | |
602 | thread_add_timer_msec(master, | |
603 | vrrp_master_down_timer_expire, r, | |
604 | r->master_down_interval * 10, | |
605 | &r->t_master_down_timer); | |
606 | } else if (r->vr->preempt_mode == true | |
607 | && pkt->hdr.priority < r->priority) { | |
608 | /* Discard advertisement */ | |
3708883c QY |
609 | zlog_debug(VRRP_LOGPFX VRRP_LOGPFX_VRID |
610 | "Discarding advertisement from %s", | |
611 | r->vr->vrid, sipstr); | |
10133a59 QY |
612 | } |
613 | break; | |
614 | case VRRP_STATE_INITIALIZE: | |
615 | zlog_err(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
616 | "Received ADVERTISEMENT in state %s; this is a bug", | |
617 | r->vr->vrid, vrrp_state_names[r->fsm.state]); | |
618 | break; | |
619 | } | |
620 | ||
621 | return 0; | |
91188ca6 QY |
622 | } |
623 | ||
624 | /* | |
625 | * Read and process next IPvX datagram. | |
626 | */ | |
627 | static int vrrp_read(struct thread *thread) | |
628 | { | |
629 | struct vrrp_router *r = thread->arg; | |
630 | ||
631 | struct vrrp_pkt *pkt; | |
632 | ssize_t pktsize; | |
633 | ssize_t nbytes; | |
634 | bool resched; | |
635 | char errbuf[BUFSIZ]; | |
636 | uint8_t control[64]; | |
d04bb25a | 637 | struct ipaddr src = {}; |
91188ca6 QY |
638 | |
639 | struct msghdr m; | |
640 | struct iovec iov; | |
641 | iov.iov_base = r->ibuf; | |
642 | iov.iov_len = sizeof(r->ibuf); | |
643 | m.msg_name = NULL; | |
644 | m.msg_namelen = 0; | |
645 | m.msg_iov = &iov; | |
646 | m.msg_iovlen = 1; | |
647 | m.msg_control = control; | |
648 | m.msg_controllen = sizeof(control); | |
649 | ||
dad18a2f | 650 | nbytes = recvmsg(r->sock_rx, &m, MSG_DONTWAIT); |
91188ca6 QY |
651 | |
652 | if ((nbytes < 0 && ERRNO_IO_RETRY(errno))) { | |
653 | resched = true; | |
654 | goto done; | |
655 | } else if (nbytes <= 0) { | |
656 | vrrp_event(r, VRRP_EVENT_SHUTDOWN); | |
657 | resched = false; | |
658 | goto done; | |
659 | } | |
660 | ||
661 | zlog_debug(VRRP_LOGPFX VRRP_LOGPFX_VRID "Received %s datagram: ", | |
662 | r->vr->vrid, family2str(r->family)); | |
663 | zlog_hexdump(r->ibuf, nbytes); | |
664 | ||
8cb3d803 QY |
665 | pktsize = vrrp_pkt_parse_datagram(r->family, r->vr->version, &m, nbytes, |
666 | &src, &pkt, errbuf, sizeof(errbuf)); | |
91188ca6 QY |
667 | |
668 | if (pktsize < 0) { | |
669 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
670 | "%s datagram invalid: %s", | |
671 | r->vr->vrid, family2str(r->family), errbuf); | |
672 | } else { | |
673 | zlog_debug(VRRP_LOGPFX VRRP_LOGPFX_VRID "Packet looks good", | |
674 | r->vr->vrid); | |
0f1f98e8 | 675 | vrrp_recv_advertisement(r, &src, pkt, pktsize); |
91188ca6 QY |
676 | } |
677 | ||
678 | resched = true; | |
679 | ||
680 | done: | |
681 | memset(r->ibuf, 0x00, sizeof(r->ibuf)); | |
682 | ||
683 | if (resched) | |
dad18a2f QY |
684 | thread_add_read(master, vrrp_read, r, r->sock_rx, &r->t_read); |
685 | ||
686 | return 0; | |
687 | } | |
688 | ||
689 | /* | |
690 | * Finds the first connected address of the appropriate family on a VRRP | |
691 | * router's interface and binds the Tx socket of the VRRP router to that | |
692 | * address. | |
693 | * | |
8071d5c3 QY |
694 | * Also sets src field of vrrp_router. |
695 | * | |
dad18a2f QY |
696 | * r |
697 | * VRRP router to operate on | |
698 | * | |
699 | * Returns: | |
700 | * 0 on success | |
701 | * -1 on failure | |
702 | */ | |
703 | static int vrrp_bind_to_primary_connected(struct vrrp_router *r) | |
704 | { | |
705 | char ipstr[INET6_ADDRSTRLEN]; | |
7e205b4a QY |
706 | struct interface *ifp; |
707 | ||
708 | /* | |
709 | * A slight quirk: the RFC specifies that advertisements under IPv6 must | |
710 | * be transmitted using the link local address of the source interface | |
711 | */ | |
712 | ifp = r->family == AF_INET ? r->vr->ifp : r->mvl_ifp; | |
dad18a2f QY |
713 | |
714 | struct listnode *ln; | |
715 | struct connected *c = NULL; | |
7e205b4a | 716 | for (ALL_LIST_ELEMENTS_RO(ifp->connected, ln, c)) |
dad18a2f QY |
717 | if (c->address->family == r->family) |
718 | break; | |
719 | ||
720 | if (c == NULL) { | |
721 | zlog_err(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
722 | "Failed to find %s address to bind on %s", | |
7e205b4a | 723 | r->vr->vrid, family2str(r->family), ifp->name); |
dad18a2f QY |
724 | return -1; |
725 | } | |
726 | ||
7e205b4a QY |
727 | union sockunion su; |
728 | memset(&su, 0x00, sizeof(su)); | |
dad18a2f | 729 | |
7e205b4a QY |
730 | switch (r->family) { |
731 | case AF_INET: | |
8071d5c3 QY |
732 | r->src.ipa_type = IPADDR_V4; |
733 | r->src.ipaddr_v4 = c->address->u.prefix4; | |
7e205b4a QY |
734 | su.sin.sin_family = AF_INET; |
735 | su.sin.sin_addr = c->address->u.prefix4; | |
736 | break; | |
737 | case AF_INET6: | |
8071d5c3 QY |
738 | r->src.ipa_type = IPADDR_V6; |
739 | r->src.ipaddr_v6 = c->address->u.prefix6; | |
7e205b4a QY |
740 | su.sin6.sin6_family = AF_INET6; |
741 | su.sin6.sin6_scope_id = ifp->ifindex; | |
742 | su.sin6.sin6_addr = c->address->u.prefix6; | |
743 | break; | |
744 | } | |
dad18a2f QY |
745 | |
746 | sockopt_reuseaddr(r->sock_tx); | |
7e205b4a | 747 | if (bind(r->sock_tx, (const struct sockaddr *)&su, sizeof(su)) < 0) { |
dad18a2f QY |
748 | zlog_err( |
749 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
750 | "Failed to bind Tx socket to primary IP address %s: %s", | |
751 | r->vr->vrid, | |
752 | inet_ntop(r->family, | |
753 | (const void *)&c->address->u.prefix, ipstr, | |
754 | sizeof(ipstr)), | |
755 | safe_strerror(errno)); | |
756 | return -1; | |
757 | } else { | |
758 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
759 | "Bound Tx socket to primary IP address %s", | |
760 | r->vr->vrid, | |
761 | inet_ntop(r->family, | |
762 | (const void *)&c->address->u.prefix, ipstr, | |
763 | sizeof(ipstr))); | |
764 | } | |
91188ca6 QY |
765 | |
766 | return 0; | |
5435a2bf | 767 | } |
5435a2bf QY |
768 | |
769 | /* | |
dad18a2f QY |
770 | * Creates and configures VRRP router sockets. |
771 | * | |
772 | * This function: | |
773 | * - Creates two sockets, one for Tx, one for Rx | |
774 | * - Joins the Rx socket to the appropriate VRRP multicast group | |
775 | * - Sets the Tx socket to set the TTL (v4) or Hop Limit (v6) field to 255 for | |
776 | * all transmitted IPvX packets | |
777 | * - Requests the kernel to deliver IPv6 header values needed to validate VRRP | |
778 | * packets | |
dad18a2f QY |
779 | * |
780 | * If any of the above fail, the sockets are closed. The only exception is if | |
781 | * the TTL / Hop Limit settings fail; these are logged, but configuration | |
782 | * proceeds. | |
5435a2bf QY |
783 | * |
784 | * The first connected address on the Virtual Router's interface is used as the | |
785 | * interface address. | |
786 | * | |
862f2f37 QY |
787 | * r |
788 | * VRRP Router for which to create listen socket | |
dad18a2f QY |
789 | * |
790 | * Returns: | |
791 | * 0 on success | |
792 | * -1 on failure | |
5435a2bf | 793 | */ |
862f2f37 | 794 | static int vrrp_socket(struct vrrp_router *r) |
5435a2bf | 795 | { |
5435a2bf | 796 | int ret; |
91188ca6 | 797 | bool failed = false; |
5435a2bf | 798 | |
dad18a2f QY |
799 | frr_elevate_privs(&vrrp_privs) |
800 | { | |
801 | r->sock_rx = socket(r->family, SOCK_RAW, IPPROTO_VRRP); | |
802 | r->sock_tx = socket(r->family, SOCK_RAW, IPPROTO_VRRP); | |
5435a2bf QY |
803 | } |
804 | ||
dad18a2f QY |
805 | if (r->sock_rx < 0 || r->sock_tx < 0) { |
806 | const char *rxtx = r->sock_rx < 0 ? "Rx" : "Tx"; | |
4ec94408 | 807 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID |
dad18a2f QY |
808 | "Can't create %s VRRP %s socket", |
809 | r->vr->vrid, family2str(r->family), rxtx); | |
91188ca6 QY |
810 | failed = true; |
811 | goto done; | |
4ec94408 | 812 | } |
40744000 | 813 | |
dad18a2f | 814 | /* Configure sockets */ |
91188ca6 | 815 | if (r->family == AF_INET) { |
dad18a2f | 816 | /* Set Tx socket to always Tx with TTL set to 255 */ |
91188ca6 | 817 | int ttl = 255; |
dad18a2f | 818 | ret = setsockopt(r->sock_tx, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, |
91188ca6 QY |
819 | sizeof(ttl)); |
820 | if (ret < 0) { | |
821 | zlog_warn( | |
822 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
823 | "Failed to set outgoing multicast TTL count to 255; RFC 5798 compliant implementations will drop our packets", | |
824 | r->vr->vrid); | |
825 | } | |
826 | ||
6e9529ed QY |
827 | /* Turn off multicast loop on Tx */ |
828 | setsockopt_ipv4_multicast_loop(r->sock_tx, 0); | |
829 | ||
b523b241 QY |
830 | /* Bind Rx socket to exact interface */ |
831 | vrrp_privs.change(ZPRIVS_RAISE); | |
832 | { | |
833 | ret = setsockopt(r->sock_rx, SOL_SOCKET, | |
834 | SO_BINDTODEVICE, r->vr->ifp->name, | |
835 | strlen(r->vr->ifp->name)); | |
836 | } | |
837 | vrrp_privs.change(ZPRIVS_LOWER); | |
838 | if (ret) { | |
839 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
840 | "Failed to bind Rx socket to %s: %s", | |
841 | r->vr->vrid, r->vr->ifp->name, | |
842 | safe_strerror(errno)); | |
843 | failed = true; | |
844 | goto done; | |
845 | } | |
846 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID "Bound Rx socket to %s", | |
847 | r->vr->vrid, r->vr->ifp->name); | |
848 | ||
849 | /* Bind Rx socket to v4 multicast address */ | |
850 | struct sockaddr_in sa = {0}; | |
851 | sa.sin_family = AF_INET; | |
852 | sa.sin_addr.s_addr = htonl(VRRP_MCASTV4_GROUP); | |
853 | if (bind(r->sock_rx, (struct sockaddr *)&sa, sizeof(sa))) { | |
854 | zlog_err( | |
855 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
856 | "Failed to bind Rx socket to VRRP %s multicast group: %s", | |
857 | r->vr->vrid, family2str(r->family), | |
858 | safe_strerror(errno)); | |
859 | failed = true; | |
860 | goto done; | |
861 | } | |
862 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
863 | "Bound Rx socket to VRRP %s multicast group", | |
864 | r->vr->vrid, family2str(r->family)); | |
865 | ||
dad18a2f QY |
866 | /* Join Rx socket to VRRP IPv4 multicast group */ |
867 | struct connected *c = listhead(r->vr->ifp->connected)->data; | |
91188ca6 | 868 | struct in_addr v4 = c->address->u.prefix4; |
dad18a2f QY |
869 | ret = setsockopt_ipv4_multicast(r->sock_rx, IP_ADD_MEMBERSHIP, |
870 | v4, htonl(VRRP_MCASTV4_GROUP), | |
862f2f37 | 871 | r->vr->ifp->ifindex); |
b523b241 QY |
872 | if (ret < 0) { |
873 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
874 | "Failed to join VRRP %s multicast group", | |
875 | r->vr->vrid, family2str(r->family)); | |
876 | failed = true; | |
877 | goto done; | |
878 | } | |
879 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
880 | "Joined %s VRRP multicast group", | |
881 | r->vr->vrid, family2str(r->family)); | |
7e205b4a QY |
882 | |
883 | /* Set outgoing interface for advertisements */ | |
884 | struct ip_mreqn mreqn = {}; | |
885 | mreqn.imr_ifindex = r->mvl_ifp->ifindex; | |
886 | ret = setsockopt(r->sock_tx, IPPROTO_IP, IP_MULTICAST_IF, | |
887 | (void *)&mreqn, sizeof(mreqn)); | |
888 | if (ret < 0) { | |
889 | zlog_warn( | |
890 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
891 | "Could not set %s as outgoing multicast interface", | |
892 | r->vr->vrid, r->mvl_ifp->name); | |
893 | failed = true; | |
894 | goto done; | |
895 | } | |
896 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
897 | "Set %s as outgoing multicast interface", | |
898 | r->vr->vrid, r->mvl_ifp->name); | |
91188ca6 | 899 | } else if (r->family == AF_INET6) { |
dad18a2f QY |
900 | /* Always transmit IPv6 packets with hop limit set to 255 */ |
901 | ret = setsockopt_ipv6_multicast_hops(r->sock_tx, 255); | |
91188ca6 QY |
902 | if (ret < 0) { |
903 | zlog_warn( | |
904 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
905 | "Failed to set outgoing multicast hop count to 255; RFC 5798 compliant implementations will drop our packets", | |
906 | r->vr->vrid); | |
907 | } | |
d04bb25a QY |
908 | |
909 | /* Request hop limit delivery */ | |
910 | setsockopt_ipv6_hoplimit(r->sock_rx, 1); | |
91188ca6 QY |
911 | if (ret < 0) { |
912 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
913 | "Failed to request IPv6 Hop Limit delivery", | |
914 | r->vr->vrid); | |
915 | failed = true; | |
916 | goto done; | |
917 | } | |
918 | ||
6e9529ed QY |
919 | /* Turn off multicast loop on Tx */ |
920 | setsockopt_ipv6_multicast_loop(r->sock_tx, 0); | |
921 | ||
b523b241 QY |
922 | /* Bind Rx socket to exact interface */ |
923 | vrrp_privs.change(ZPRIVS_RAISE); | |
924 | { | |
925 | ret = setsockopt(r->sock_rx, SOL_SOCKET, | |
926 | SO_BINDTODEVICE, r->vr->ifp->name, | |
927 | strlen(r->vr->ifp->name)); | |
928 | } | |
929 | vrrp_privs.change(ZPRIVS_LOWER); | |
930 | if (ret) { | |
931 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
932 | "Failed to bind Rx socket to %s: %s", | |
933 | r->vr->vrid, r->vr->ifp->name, | |
934 | safe_strerror(errno)); | |
935 | failed = true; | |
936 | goto done; | |
937 | } | |
938 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID "Bound Rx socket to %s", | |
939 | r->vr->vrid, r->vr->ifp->name); | |
940 | ||
941 | /* Bind Rx socket to v6 multicast address */ | |
942 | struct sockaddr_in6 sa = {0}; | |
943 | sa.sin6_family = AF_INET6; | |
944 | inet_pton(AF_INET6, VRRP_MCASTV6_GROUP_STR, &sa.sin6_addr); | |
945 | if (bind(r->sock_rx, (struct sockaddr *)&sa, sizeof(sa))) { | |
946 | zlog_err( | |
947 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
948 | "Failed to bind Rx socket to VRRP %s multicast group: %s", | |
949 | r->vr->vrid, family2str(r->family), | |
950 | safe_strerror(errno)); | |
951 | failed = true; | |
952 | goto done; | |
953 | } | |
954 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
955 | "Bound Rx socket to VRRP %s multicast group", | |
956 | r->vr->vrid, family2str(r->family)); | |
957 | ||
91188ca6 | 958 | /* Join VRRP IPv6 multicast group */ |
862f2f37 | 959 | struct ipv6_mreq mreq; |
dad18a2f QY |
960 | inet_pton(AF_INET6, VRRP_MCASTV6_GROUP_STR, |
961 | &mreq.ipv6mr_multiaddr); | |
862f2f37 | 962 | mreq.ipv6mr_interface = r->vr->ifp->ifindex; |
dad18a2f QY |
963 | ret = setsockopt(r->sock_rx, IPPROTO_IPV6, IPV6_JOIN_GROUP, |
964 | &mreq, sizeof(mreq)); | |
b523b241 QY |
965 | if (ret < 0) { |
966 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
967 | "Failed to join VRRP %s multicast group", | |
968 | r->vr->vrid, family2str(r->family)); | |
969 | failed = true; | |
970 | goto done; | |
971 | } | |
972 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
973 | "Joined %s VRRP multicast group", | |
974 | r->vr->vrid, family2str(r->family)); | |
7e205b4a QY |
975 | |
976 | /* Set outgoing interface for advertisements */ | |
977 | ret = setsockopt(r->sock_tx, IPPROTO_IPV6, IPV6_MULTICAST_IF, | |
978 | &r->mvl_ifp->ifindex, sizeof(ifindex_t)); | |
979 | if (ret < 0) { | |
980 | zlog_warn( | |
981 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
982 | "Could not set %s as outgoing multicast interface", | |
983 | r->vr->vrid, r->mvl_ifp->name); | |
984 | failed = true; | |
985 | goto done; | |
986 | } | |
987 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
988 | "Set %s as outgoing multicast interface", | |
989 | r->vr->vrid, r->mvl_ifp->name); | |
862f2f37 QY |
990 | } |
991 | ||
dad18a2f QY |
992 | /* Bind Tx socket to link-local address */ |
993 | if (vrrp_bind_to_primary_connected(r) < 0) { | |
994 | failed = true; | |
995 | goto done; | |
5435a2bf | 996 | } |
dad18a2f | 997 | |
91188ca6 QY |
998 | done: |
999 | ret = 0; | |
1000 | if (failed) { | |
1001 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1002 | "Failed to initialize VRRP %s router", | |
1003 | r->vr->vrid, family2str(r->family)); | |
1b5e2a22 | 1004 | if (r->sock_rx >= 0) { |
dad18a2f | 1005 | close(r->sock_rx); |
1b5e2a22 QY |
1006 | r->sock_rx = -1; |
1007 | } | |
1008 | if (r->sock_tx >= 0) { | |
dad18a2f | 1009 | close(r->sock_tx); |
1b5e2a22 QY |
1010 | r->sock_tx = -1; |
1011 | } | |
91188ca6 QY |
1012 | ret = -1; |
1013 | } | |
1014 | ||
1015 | return ret; | |
5435a2bf QY |
1016 | } |
1017 | ||
1018 | ||
1019 | /* State machine ----------------------------------------------------------- */ | |
1020 | ||
862f2f37 | 1021 | DEFINE_HOOK(vrrp_change_state_hook, (struct vrrp_router * r, int to), (r, to)); |
5435a2bf QY |
1022 | |
1023 | /* | |
1024 | * Handle any necessary actions during state change to MASTER state. | |
1025 | * | |
862f2f37 QY |
1026 | * r |
1027 | * VRRP Router to operate on | |
5435a2bf | 1028 | */ |
862f2f37 | 1029 | static void vrrp_change_state_master(struct vrrp_router *r) |
5435a2bf | 1030 | { |
f3fe0047 QY |
1031 | /* Enable ND Router Advertisements */ |
1032 | if (r->family == AF_INET6) | |
1033 | vrrp_zebra_radv_set(r, true); | |
c3bd894e QY |
1034 | |
1035 | vrrp_zclient_send_interface_protodown(r->mvl_ifp, false); | |
5435a2bf QY |
1036 | } |
1037 | ||
1038 | /* | |
1039 | * Handle any necessary actions during state change to BACKUP state. | |
1040 | * | |
862f2f37 | 1041 | * r |
5435a2bf QY |
1042 | * Virtual Router to operate on |
1043 | */ | |
862f2f37 | 1044 | static void vrrp_change_state_backup(struct vrrp_router *r) |
5435a2bf | 1045 | { |
f3fe0047 QY |
1046 | /* Disable ND Router Advertisements */ |
1047 | if (r->family == AF_INET6) | |
1048 | vrrp_zebra_radv_set(r, false); | |
c3bd894e QY |
1049 | |
1050 | vrrp_zclient_send_interface_protodown(r->mvl_ifp, true); | |
5435a2bf QY |
1051 | } |
1052 | ||
1053 | /* | |
1054 | * Handle any necessary actions during state change to INITIALIZE state. | |
1055 | * | |
1056 | * This is not called for initial startup, only when transitioning from MASTER | |
1057 | * or BACKUP. | |
1058 | * | |
862f2f37 QY |
1059 | * r |
1060 | * VRRP Router to operate on | |
5435a2bf | 1061 | */ |
862f2f37 | 1062 | static void vrrp_change_state_initialize(struct vrrp_router *r) |
5435a2bf | 1063 | { |
862f2f37 QY |
1064 | r->vr->advertisement_interval = r->vr->advertisement_interval; |
1065 | r->master_adver_interval = 0; | |
1066 | vrrp_recalculate_timers(r); | |
f3fe0047 QY |
1067 | |
1068 | /* Disable ND Router Advertisements */ | |
1069 | if (r->family == AF_INET6) | |
1070 | vrrp_zebra_radv_set(r, false); | |
5435a2bf QY |
1071 | } |
1072 | ||
862f2f37 | 1073 | void (*vrrp_change_state_handlers[])(struct vrrp_router *vr) = { |
5435a2bf QY |
1074 | [VRRP_STATE_MASTER] = vrrp_change_state_master, |
1075 | [VRRP_STATE_BACKUP] = vrrp_change_state_backup, | |
1076 | [VRRP_STATE_INITIALIZE] = vrrp_change_state_initialize, | |
1077 | }; | |
1078 | ||
1079 | /* | |
1080 | * Change Virtual Router FSM position. Handles transitional actions and calls | |
1081 | * any subscribers to the state change hook. | |
1082 | * | |
862f2f37 | 1083 | * r |
5435a2bf QY |
1084 | * Virtual Router for which to change state |
1085 | * | |
1086 | * to | |
1087 | * State to change to | |
1088 | */ | |
862f2f37 | 1089 | static void vrrp_change_state(struct vrrp_router *r, int to) |
5435a2bf | 1090 | { |
6287cefe QY |
1091 | if (r->fsm.state == to) |
1092 | return; | |
1093 | ||
5435a2bf | 1094 | /* Call our handlers, then any subscribers */ |
862f2f37 QY |
1095 | vrrp_change_state_handlers[to](r); |
1096 | hook_call(vrrp_change_state_hook, r, to); | |
1097 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID "%s -> %s", r->vr->vrid, | |
1098 | vrrp_state_names[r->fsm.state], vrrp_state_names[to]); | |
1099 | r->fsm.state = to; | |
5435a2bf QY |
1100 | } |
1101 | ||
1102 | /* | |
1103 | * Called when Adver_Timer expires. | |
1104 | */ | |
1105 | static int vrrp_adver_timer_expire(struct thread *thread) | |
1106 | { | |
862f2f37 | 1107 | struct vrrp_router *r = thread->arg; |
5435a2bf | 1108 | |
862f2f37 QY |
1109 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID "Adver_Timer expired", |
1110 | r->vr->vrid); | |
4ec94408 | 1111 | |
862f2f37 | 1112 | if (r->fsm.state == VRRP_STATE_MASTER) { |
3e7a4043 | 1113 | /* Send an ADVERTISEMENT */ |
862f2f37 | 1114 | vrrp_send_advertisement(r); |
5435a2bf | 1115 | |
3e7a4043 | 1116 | /* Reset the Adver_Timer to Advertisement_Interval */ |
862f2f37 QY |
1117 | thread_add_timer_msec(master, vrrp_adver_timer_expire, r, |
1118 | r->vr->advertisement_interval * 10, | |
1119 | &r->t_adver_timer); | |
3e7a4043 QY |
1120 | } else { |
1121 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1122 | "Adver_Timer expired in state '%s'; this is a bug", | |
862f2f37 | 1123 | r->vr->vrid, vrrp_state_names[r->fsm.state]); |
5435a2bf | 1124 | } |
3e7a4043 | 1125 | |
5435a2bf QY |
1126 | return 0; |
1127 | } | |
1128 | ||
1129 | /* | |
4ec94408 | 1130 | * Called when Master_Down_Timer expires. |
5435a2bf QY |
1131 | */ |
1132 | static int vrrp_master_down_timer_expire(struct thread *thread) | |
1133 | { | |
862f2f37 | 1134 | struct vrrp_router *r = thread->arg; |
4ec94408 QY |
1135 | |
1136 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID "Master_Down_Timer expired", | |
862f2f37 | 1137 | r->vr->vrid); |
5435a2bf | 1138 | |
c7e3b83d QY |
1139 | vrrp_send_advertisement(r); |
1140 | if (r->family == AF_INET) | |
1141 | vrrp_garp_send_all(r); | |
4f52e9a6 QY |
1142 | if (r->family == AF_INET6) |
1143 | vrrp_ndisc_una_send_all(r); | |
c7e3b83d QY |
1144 | thread_add_timer_msec(master, vrrp_adver_timer_expire, r, |
1145 | r->vr->advertisement_interval * 10, | |
1146 | &r->t_adver_timer); | |
1147 | vrrp_change_state(r, VRRP_STATE_MASTER); | |
1148 | ||
5435a2bf QY |
1149 | return 0; |
1150 | } | |
1151 | ||
1152 | /* | |
1153 | * Event handler for Startup event. | |
1154 | * | |
1155 | * Creates sockets, sends advertisements and ARP requests, starts timers, | |
1d21789e QY |
1156 | * and transitions the Virtual Router to either Master or Backup states. |
1157 | * | |
1158 | * This function will also initialize the program's global ARP subsystem if it | |
1159 | * has not yet been initialized. | |
5435a2bf | 1160 | * |
862f2f37 QY |
1161 | * r |
1162 | * VRRP Router on which to apply Startup event | |
1d21789e QY |
1163 | * |
1164 | * Returns: | |
1165 | * < 0 if the session socket could not be created, or the state is not | |
1166 | * Initialize | |
1167 | * 0 on success | |
5435a2bf | 1168 | */ |
862f2f37 | 1169 | static int vrrp_startup(struct vrrp_router *r) |
5435a2bf | 1170 | { |
1d21789e | 1171 | /* May only be called when the state is Initialize */ |
862f2f37 | 1172 | if (r->fsm.state != VRRP_STATE_INITIALIZE) |
1d21789e QY |
1173 | return -1; |
1174 | ||
7e205b4a | 1175 | /* Must have a valid macvlan interface available */ |
85467974 | 1176 | if (r->mvl_ifp == NULL && !vrrp_attach_interface(r)) { |
7e205b4a QY |
1177 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID |
1178 | "No appropriate interface for %s VRRP found", | |
1179 | r->vr->vrid, family2str(r->family)); | |
1180 | return -1; | |
1181 | } | |
1182 | ||
40744000 | 1183 | /* Initialize global gratuitous ARP socket if necessary */ |
862f2f37 | 1184 | if (r->family == AF_INET && !vrrp_garp_is_init()) |
40744000 | 1185 | vrrp_garp_init(); |
4f52e9a6 QY |
1186 | if (r->family == AF_INET6 && !vrrp_ndisc_is_init()) |
1187 | vrrp_ndisc_init(); | |
40744000 | 1188 | |
5435a2bf | 1189 | /* Create socket */ |
dad18a2f | 1190 | if (r->sock_rx < 0 || r->sock_tx < 0) { |
862f2f37 | 1191 | int ret = vrrp_socket(r); |
dad18a2f | 1192 | if (ret < 0 || r->sock_tx < 0 || r->sock_rx < 0) |
862f2f37 QY |
1193 | return ret; |
1194 | } | |
5435a2bf QY |
1195 | |
1196 | /* Schedule listener */ | |
dad18a2f | 1197 | thread_add_read(master, vrrp_read, r, r->sock_rx, &r->t_read); |
5435a2bf | 1198 | |
91188ca6 | 1199 | /* Configure effective priority */ |
862f2f37 QY |
1200 | struct ipaddr *primary = (struct ipaddr *)listhead(r->addrs)->data; |
1201 | ||
1202 | char ipbuf[INET6_ADDRSTRLEN]; | |
1203 | inet_ntop(r->family, &primary->ip.addr, ipbuf, sizeof(ipbuf)); | |
1204 | ||
7e205b4a | 1205 | if (vrrp_is_owner(r->vr->ifp, primary)) { |
862f2f37 QY |
1206 | r->priority = VRRP_PRIO_MASTER; |
1207 | vrrp_recalculate_timers(r); | |
1208 | ||
5d3730c5 QY |
1209 | zlog_info( |
1210 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1211 | "%s owns primary Virtual Router IP %s; electing self as Master", | |
862f2f37 | 1212 | r->vr->vrid, r->vr->ifp->name, ipbuf); |
5d3730c5 QY |
1213 | } |
1214 | ||
862f2f37 QY |
1215 | if (r->priority == VRRP_PRIO_MASTER) { |
1216 | vrrp_send_advertisement(r); | |
5435a2bf | 1217 | |
862f2f37 QY |
1218 | if (r->family == AF_INET) |
1219 | vrrp_garp_send_all(r); | |
4f52e9a6 QY |
1220 | if (r->family == AF_INET6) |
1221 | vrrp_ndisc_una_send_all(r); | |
862f2f37 QY |
1222 | |
1223 | thread_add_timer_msec(master, vrrp_adver_timer_expire, r, | |
1224 | r->vr->advertisement_interval * 10, | |
1225 | &r->t_adver_timer); | |
1226 | vrrp_change_state(r, VRRP_STATE_MASTER); | |
5435a2bf | 1227 | } else { |
862f2f37 QY |
1228 | r->master_adver_interval = r->vr->advertisement_interval; |
1229 | vrrp_recalculate_timers(r); | |
1230 | thread_add_timer_msec(master, vrrp_master_down_timer_expire, r, | |
1231 | r->master_down_interval * 10, | |
1232 | &r->t_master_down_timer); | |
1233 | vrrp_change_state(r, VRRP_STATE_BACKUP); | |
5435a2bf | 1234 | } |
a8144d7f | 1235 | |
862f2f37 QY |
1236 | r->is_active = true; |
1237 | ||
a8144d7f | 1238 | return 0; |
5435a2bf QY |
1239 | } |
1240 | ||
1d21789e QY |
1241 | /* |
1242 | * Shuts down a Virtual Router and transitions it to Initialize. | |
1243 | * | |
1244 | * This call must be idempotent; it is safe to call multiple times on the same | |
862f2f37 | 1245 | * VRRP Router. |
1d21789e | 1246 | */ |
862f2f37 | 1247 | static int vrrp_shutdown(struct vrrp_router *r) |
5435a2bf | 1248 | { |
862f2f37 QY |
1249 | switch (r->fsm.state) { |
1250 | case VRRP_STATE_MASTER: | |
1251 | /* Cancel the Adver_Timer */ | |
1252 | THREAD_OFF(r->t_adver_timer); | |
1253 | /* Send an ADVERTISEMENT with Priority = 0 */ | |
1254 | uint8_t saved_prio = r->priority; | |
1255 | r->priority = 0; | |
1256 | vrrp_send_advertisement(r); | |
1257 | r->priority = saved_prio; | |
1258 | break; | |
1259 | case VRRP_STATE_BACKUP: | |
1260 | /* Cancel the Master_Down_Timer */ | |
1261 | THREAD_OFF(r->t_master_down_timer); | |
1262 | break; | |
1263 | case VRRP_STATE_INITIALIZE: | |
1264 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1265 | "Received '%s' event in '%s' state; ignoring", | |
1266 | r->vr->vrid, vrrp_event_names[VRRP_EVENT_SHUTDOWN], | |
1267 | vrrp_state_names[VRRP_STATE_INITIALIZE]); | |
1268 | break; | |
3e7a4043 QY |
1269 | } |
1270 | ||
3e7a4043 | 1271 | /* Transition to the Initialize state */ |
862f2f37 | 1272 | vrrp_change_state(r, VRRP_STATE_INITIALIZE); |
1d21789e | 1273 | |
73b5cb19 QY |
1274 | r->is_active = false; |
1275 | ||
a8144d7f | 1276 | return 0; |
5435a2bf QY |
1277 | } |
1278 | ||
862f2f37 | 1279 | static int (*vrrp_event_handlers[])(struct vrrp_router *r) = { |
5435a2bf QY |
1280 | [VRRP_EVENT_STARTUP] = vrrp_startup, |
1281 | [VRRP_EVENT_SHUTDOWN] = vrrp_shutdown, | |
1282 | }; | |
1283 | ||
1284 | /* | |
862f2f37 | 1285 | * Spawn a VRRP FSM event on a VRRP Router. |
5435a2bf QY |
1286 | * |
1287 | * vr | |
862f2f37 | 1288 | * VRRP Router on which to spawn event |
5435a2bf QY |
1289 | * |
1290 | * event | |
1291 | * The event to spawn | |
27fd8827 QY |
1292 | * |
1293 | * Returns: | |
1294 | * -1 on failure | |
1295 | * 0 otherwise | |
5435a2bf | 1296 | */ |
862f2f37 | 1297 | int vrrp_event(struct vrrp_router *r, int event) |
5435a2bf | 1298 | { |
862f2f37 QY |
1299 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID "'%s' event", r->vr->vrid, |
1300 | vrrp_event_names[r->fsm.state]); | |
1301 | return vrrp_event_handlers[event](r); | |
5435a2bf QY |
1302 | } |
1303 | ||
1304 | ||
27fd8827 QY |
1305 | /* Autoconfig -------------------------------------------------------------- */ |
1306 | ||
1307 | /* | |
1308 | * Set the configured addresses for this VRRP instance to exactly the addresses | |
1309 | * present on its macvlan subinterface(s). | |
1310 | * | |
1311 | * vr | |
1312 | * VRRP router to act on | |
1313 | */ | |
1314 | static void vrrp_autoconfig_autoaddrupdate(struct vrrp_vrouter *vr) | |
1315 | { | |
1316 | list_delete_all_node(vr->v4->addrs); | |
1317 | list_delete_all_node(vr->v6->addrs); | |
1318 | ||
1319 | struct listnode *ln; | |
1320 | struct connected *c = NULL; | |
1321 | ||
1322 | if (vr->v4->mvl_ifp) | |
1323 | for (ALL_LIST_ELEMENTS_RO(vr->v4->mvl_ifp->connected, ln, c)) | |
1324 | if (c->address->family == AF_INET) | |
1325 | vrrp_add_ipv4(vr, c->address->u.prefix4, true); | |
1326 | ||
1327 | if (vr->v6->mvl_ifp) | |
1328 | for (ALL_LIST_ELEMENTS_RO(vr->v6->mvl_ifp->connected, ln, c)) | |
1329 | if (c->address->family == AF_INET6 | |
1330 | && !IN6_IS_ADDR_LINKLOCAL(&c->address->u.prefix6)) | |
1331 | vrrp_add_ipv6(vr, c->address->u.prefix6, true); | |
1332 | ||
1333 | if (vr->v4->addrs->count == 0 | |
1334 | && vr->v4->fsm.state != VRRP_STATE_INITIALIZE) | |
1335 | vrrp_event(vr->v4, VRRP_EVENT_SHUTDOWN); | |
1336 | if (vr->v6->addrs->count == 0 | |
1337 | && vr->v6->fsm.state != VRRP_STATE_INITIALIZE) | |
1338 | vrrp_event(vr->v4, VRRP_EVENT_SHUTDOWN); | |
1339 | } | |
5435a2bf | 1340 | |
53e60e5c QY |
1341 | static struct vrrp_vrouter * |
1342 | vrrp_autoconfig_autocreate(struct interface *mvl_ifp) | |
1343 | { | |
1344 | struct interface *p; | |
1345 | struct vrrp_vrouter *vr; | |
1346 | ||
1347 | p = if_lookup_by_index(mvl_ifp->link_ifindex, VRF_DEFAULT); | |
27fd8827 QY |
1348 | |
1349 | if (!p) | |
1350 | return NULL; | |
1351 | ||
53e60e5c QY |
1352 | uint8_t vrid = mvl_ifp->hw_addr[5]; |
1353 | ||
1354 | zlog_info(VRRP_LOGPFX "Autoconfiguring VRRP on %s", p->name); | |
1355 | ||
53e60e5c QY |
1356 | vr = vrrp_vrouter_create(p, vrid, vrrp_autoconfig_version); |
1357 | ||
27fd8827 QY |
1358 | if (!vr) { |
1359 | zlog_warn(VRRP_LOGPFX | |
1360 | "Failed to autoconfigure VRRP instance %" PRIu8 | |
1361 | " on %s", | |
1362 | vrid, p->name); | |
53e60e5c | 1363 | return NULL; |
27fd8827 | 1364 | } |
53e60e5c | 1365 | |
27fd8827 | 1366 | vrrp_autoconfig_autoaddrupdate(vr); |
53e60e5c QY |
1367 | |
1368 | vr->autoconf = true; | |
1369 | ||
1370 | return vr; | |
1371 | } | |
1372 | ||
27fd8827 | 1373 | static bool vrrp_ifp_has_vrrp_mac(struct interface *ifp) |
53e60e5c QY |
1374 | { |
1375 | struct ethaddr vmac4; | |
1376 | struct ethaddr vmac6; | |
1377 | vrrp_mac_set(&vmac4, 0, 0x00); | |
1378 | vrrp_mac_set(&vmac6, 1, 0x00); | |
1379 | ||
1380 | return !memcmp(ifp->hw_addr, vmac4.octet, sizeof(vmac4.octet) - 1) | |
1381 | || !memcmp(ifp->hw_addr, vmac6.octet, sizeof(vmac6.octet) - 1); | |
1382 | } | |
1383 | ||
27fd8827 QY |
1384 | static struct vrrp_vrouter *vrrp_lookup_by_mvlif(struct interface *mvl_ifp) |
1385 | { | |
1386 | struct interface *p; | |
1387 | ||
1388 | if (!mvl_ifp || !mvl_ifp->link_ifindex | |
1389 | || !vrrp_ifp_has_vrrp_mac(mvl_ifp)) | |
1390 | return NULL; | |
1391 | ||
1392 | p = if_lookup_by_index(mvl_ifp->link_ifindex, VRF_DEFAULT); | |
1393 | uint8_t vrid = mvl_ifp->hw_addr[5]; | |
1394 | ||
1395 | return vrrp_lookup(p, vrid); | |
1396 | } | |
1397 | ||
1398 | int vrrp_autoconfig_if_add(struct interface *ifp) | |
1399 | { | |
1400 | if (!vrrp_autoconfig_is_on) | |
1401 | return 0; | |
1402 | ||
1403 | struct vrrp_vrouter *vr; | |
1404 | ||
1405 | if (!ifp || !ifp->link_ifindex || !vrrp_ifp_has_vrrp_mac(ifp)) | |
1406 | return -1; | |
1407 | ||
1408 | vr = vrrp_lookup_by_mvlif(ifp); | |
1409 | ||
1410 | if (!vr) | |
1411 | vr = vrrp_autoconfig_autocreate(ifp); | |
1412 | ||
1413 | if (!vr) | |
1414 | return -1; | |
1415 | ||
1416 | if (vr->autoconf == false) | |
1417 | return 0; | |
1418 | else { | |
1419 | vrrp_attach_interface(vr->v4); | |
1420 | vrrp_attach_interface(vr->v6); | |
1421 | vrrp_autoconfig_autoaddrupdate(vr); | |
1422 | } | |
1423 | ||
1424 | return 0; | |
1425 | } | |
1426 | ||
1427 | int vrrp_autoconfig_if_del(struct interface *ifp) | |
1428 | { | |
1429 | if (!vrrp_autoconfig_is_on) | |
1430 | return 0; | |
1431 | ||
1432 | struct vrrp_vrouter *vr = vrrp_lookup_by_mvlif(ifp); | |
1433 | ||
1434 | if (!vr) | |
1435 | return 0; | |
1436 | ||
1437 | if (vr && vr->autoconf == false) | |
1438 | return 0; | |
1439 | ||
1440 | if (vr && vr->v4->mvl_ifp == ifp) { | |
1441 | if (vr->v4->fsm.state != VRRP_STATE_INITIALIZE) | |
1442 | vrrp_event(vr->v4, VRRP_EVENT_SHUTDOWN); | |
1443 | vr->v4->mvl_ifp = NULL; | |
1444 | } | |
1445 | if (vr && vr->v6->mvl_ifp == ifp) { | |
1446 | if (vr->v6->fsm.state != VRRP_STATE_INITIALIZE) | |
1447 | vrrp_event(vr->v6, VRRP_EVENT_SHUTDOWN); | |
1448 | vr->v6->mvl_ifp = NULL; | |
1449 | } | |
1450 | ||
1451 | if (vr->v4->mvl_ifp == NULL && vr->v6->mvl_ifp == NULL) { | |
1452 | vrrp_vrouter_destroy(vr); | |
1453 | vr = NULL; | |
1454 | } | |
1455 | ||
1456 | return 0; | |
1457 | } | |
1458 | ||
1459 | int vrrp_autoconfig_if_up(struct interface *ifp) | |
53e60e5c | 1460 | { |
27fd8827 QY |
1461 | if (!vrrp_autoconfig_is_on) |
1462 | return 0; | |
1463 | ||
1464 | struct vrrp_vrouter *vr = vrrp_lookup_by_mvlif(ifp); | |
1465 | ||
1466 | if (vr && !vr->autoconf) | |
1467 | return 0; | |
1468 | ||
1469 | if (!vr) { | |
1470 | vrrp_autoconfig_if_add(ifp); | |
53e60e5c QY |
1471 | return 0; |
1472 | } | |
1473 | ||
27fd8827 QY |
1474 | vrrp_attach_interface(vr->v4); |
1475 | vrrp_attach_interface(vr->v6); | |
1476 | vrrp_autoconfig_autoaddrupdate(vr); | |
1477 | ||
1478 | return 0; | |
1479 | } | |
1480 | ||
1481 | int vrrp_autoconfig_if_down(struct interface *ifp) | |
1482 | { | |
1483 | if (!vrrp_autoconfig_is_on) | |
1484 | return 0; | |
1485 | ||
1486 | return 0; | |
1487 | } | |
1488 | ||
1489 | int vrrp_autoconfig_if_address_add(struct interface *ifp) | |
1490 | { | |
1491 | if (!vrrp_autoconfig_is_on) | |
1492 | return 0; | |
1493 | ||
1494 | struct vrrp_vrouter *vr = vrrp_lookup_by_mvlif(ifp); | |
1495 | ||
1496 | if (vr && vr->autoconf) | |
1497 | vrrp_autoconfig_autoaddrupdate(vr); | |
1498 | ||
1499 | return 0; | |
1500 | } | |
1501 | ||
1502 | int vrrp_autoconfig_if_address_del(struct interface *ifp) | |
1503 | { | |
1504 | if (!vrrp_autoconfig_is_on) | |
1505 | return 0; | |
1506 | ||
1507 | struct vrrp_vrouter *vr = vrrp_lookup_by_mvlif(ifp); | |
1508 | ||
1509 | if (vr && vr->autoconf) | |
1510 | vrrp_autoconfig_autoaddrupdate(vr); | |
1511 | ||
1512 | return 0; | |
1513 | } | |
1514 | ||
1515 | int vrrp_autoconfig(void) | |
1516 | { | |
1517 | if (!vrrp_autoconfig_is_on) | |
1518 | return 0; | |
1519 | ||
53e60e5c | 1520 | struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT); |
27fd8827 | 1521 | struct interface *ifp; |
53e60e5c QY |
1522 | |
1523 | FOR_ALL_INTERFACES (vrf, ifp) | |
27fd8827 | 1524 | vrrp_autoconfig_if_add(ifp); |
53e60e5c QY |
1525 | |
1526 | return 0; | |
1527 | } | |
1528 | ||
27fd8827 QY |
1529 | void vrrp_autoconfig_on(int version) |
1530 | { | |
1531 | vrrp_autoconfig_is_on = true; | |
1532 | vrrp_autoconfig_version = version; | |
1533 | ||
1534 | vrrp_autoconfig(); | |
1535 | } | |
1536 | ||
1537 | void vrrp_autoconfig_off(void) | |
1538 | { | |
1539 | vrrp_autoconfig_is_on = false; | |
1540 | ||
1541 | struct list *ll = hash_to_list(vrrp_vrouters_hash); | |
1542 | ||
1543 | struct listnode *ln; | |
1544 | struct vrrp_vrouter *vr; | |
1545 | ||
1546 | for (ALL_LIST_ELEMENTS_RO(ll, ln, vr)) | |
1547 | if (vr->autoconf) | |
1548 | vrrp_vrouter_destroy(vr); | |
1549 | ||
1550 | list_delete(&ll); | |
1551 | } | |
1552 | ||
1553 | /* Other ------------------------------------------------------------------- */ | |
1554 | ||
5435a2bf QY |
1555 | static unsigned int vrrp_hash_key(void *arg) |
1556 | { | |
1557 | struct vrrp_vrouter *vr = arg; | |
1558 | ||
4f0b6b45 QY |
1559 | char key[IFNAMSIZ + 64]; |
1560 | snprintf(key, sizeof(key), "%d%s%u", vr->ifp->ifindex, vr->ifp->name, | |
1561 | vr->vrid); | |
1562 | ||
1563 | return string_hash_make(key); | |
5435a2bf QY |
1564 | } |
1565 | ||
1566 | static bool vrrp_hash_cmp(const void *arg1, const void *arg2) | |
1567 | { | |
1568 | const struct vrrp_vrouter *vr1 = arg1; | |
1569 | const struct vrrp_vrouter *vr2 = arg2; | |
1570 | ||
4f0b6b45 QY |
1571 | if (vr1->ifp != vr2->ifp) |
1572 | return 0; | |
1573 | if (vr1->vrid != vr2->vrid) | |
1574 | return 0; | |
1575 | ||
1576 | return 1; | |
5435a2bf QY |
1577 | } |
1578 | ||
1579 | void vrrp_init(void) | |
1580 | { | |
53e60e5c | 1581 | vrrp_autoconfig_version = 3; |
5435a2bf QY |
1582 | vrrp_vrouters_hash = hash_create(&vrrp_hash_key, vrrp_hash_cmp, |
1583 | "VRRP virtual router hash"); | |
1584 | vrf_init(NULL, NULL, NULL, NULL, NULL); | |
1585 | } |