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Commit | Line | Data |
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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" |
f828842a | 32 | #include "lib/vty.h" |
5435a2bf QY |
33 | |
34 | #include "vrrp.h" | |
40744000 | 35 | #include "vrrp_arp.h" |
b637bcd4 | 36 | #include "vrrp_debug.h" |
72df9d93 | 37 | #include "vrrp_memory.h" |
4f52e9a6 | 38 | #include "vrrp_ndisc.h" |
247aa469 | 39 | #include "vrrp_packet.h" |
f3fe0047 | 40 | #include "vrrp_zebra.h" |
5435a2bf | 41 | |
4ec94408 QY |
42 | #define VRRP_LOGPFX "[CORE] " |
43 | ||
27fd8827 QY |
44 | /* statics */ |
45 | struct hash *vrrp_vrouters_hash; | |
46 | bool vrrp_autoconfig_is_on; | |
47 | int vrrp_autoconfig_version; | |
48 | ||
4ec94408 QY |
49 | const char *vrrp_state_names[3] = { |
50 | [VRRP_STATE_INITIALIZE] = "Initialize", | |
51 | [VRRP_STATE_MASTER] = "Master", | |
52 | [VRRP_STATE_BACKUP] = "Backup", | |
53 | }; | |
54 | ||
55 | const char *vrrp_event_names[2] = { | |
56 | [VRRP_EVENT_STARTUP] = "Startup", | |
57 | [VRRP_EVENT_SHUTDOWN] = "Shutdown", | |
58 | }; | |
59 | ||
60 | ||
5435a2bf QY |
61 | /* Utility functions ------------------------------------------------------- */ |
62 | ||
63 | /* | |
64 | * Sets an ethaddr to RFC-defined Virtual Router MAC address. | |
65 | * | |
66 | * mac | |
67 | * ethaddr to set | |
68 | * | |
69 | * v6 | |
70 | * Whether this is a V6 or V4 Virtual Router MAC | |
71 | * | |
72 | * vrid | |
73 | * Virtual Router Identifier | |
74 | */ | |
75 | static void vrrp_mac_set(struct ethaddr *mac, bool v6, uint8_t vrid) | |
76 | { | |
77 | /* | |
78 | * V4: 00-00-5E-00-01-{VRID} | |
79 | * V6: 00-00-5E-00-02-{VRID} | |
80 | */ | |
81 | mac->octet[0] = 0x00; | |
82 | mac->octet[1] = 0x00; | |
83 | mac->octet[2] = 0x5E; | |
84 | mac->octet[3] = 0x00; | |
85 | mac->octet[4] = v6 ? 0x02 : 0x01; | |
86 | mac->octet[5] = vrid; | |
87 | } | |
88 | ||
1d21789e | 89 | /* |
862f2f37 | 90 | * Recalculates and sets skew_time and master_down_interval based |
1d21789e QY |
91 | * values. |
92 | * | |
862f2f37 QY |
93 | * r |
94 | * VRRP Router to operate on | |
1d21789e | 95 | */ |
862f2f37 | 96 | static void vrrp_recalculate_timers(struct vrrp_router *r) |
1d21789e | 97 | { |
2884f9bb QY |
98 | uint16_t skm = (r->vr->version == 3) ? r->master_adver_interval : 1; |
99 | r->skew_time = ((256 - r->vr->priority) * skm) / 256; | |
862f2f37 QY |
100 | r->master_down_interval = (3 * r->master_adver_interval); |
101 | r->master_down_interval += r->skew_time; | |
1d21789e QY |
102 | } |
103 | ||
5d3730c5 QY |
104 | /* |
105 | * Determines if a VRRP router is the owner of the specified address. | |
106 | * | |
dad18a2f QY |
107 | * The determining factor for whether an interface is the address owner is |
108 | * simply whether the address is assigned to the VRRP subinterface by someone | |
109 | * other than vrrpd. | |
110 | * | |
111 | * This function should always return the correct answer regardless of | |
112 | * master/backup status. | |
113 | * | |
5d3730c5 | 114 | * vr |
862f2f37 | 115 | * Virtual Router |
5d3730c5 QY |
116 | * |
117 | * Returns: | |
118 | * whether or not vr owns the specified address | |
119 | */ | |
7e205b4a | 120 | static bool vrrp_is_owner(struct interface *ifp, struct ipaddr *addr) |
5d3730c5 | 121 | { |
7e205b4a | 122 | struct prefix p; |
5d3730c5 | 123 | |
7e205b4a QY |
124 | p.family = IS_IPADDR_V4(addr) ? AF_INET : AF_INET6; |
125 | p.prefixlen = IS_IPADDR_V4(addr) ? IPV4_MAX_BITLEN : IPV6_MAX_BITLEN; | |
126 | memcpy(&p.u, &addr->ip, sizeof(addr->ip)); | |
dad18a2f | 127 | |
7e205b4a | 128 | return !!connected_lookup_prefix_exact(ifp, &p); |
5d3730c5 QY |
129 | } |
130 | ||
6e93585e QY |
131 | /* |
132 | * Whether an interface has a MAC address that matches the VRRP RFC. | |
133 | * | |
134 | * ifp | |
135 | * Interface to check | |
136 | * | |
137 | * Returns: | |
138 | * Whether the interface has a VRRP mac or not | |
139 | */ | |
140 | static bool vrrp_ifp_has_vrrp_mac(struct interface *ifp) | |
141 | { | |
142 | struct ethaddr vmac4; | |
143 | struct ethaddr vmac6; | |
144 | vrrp_mac_set(&vmac4, 0, 0x00); | |
145 | vrrp_mac_set(&vmac6, 1, 0x00); | |
146 | ||
147 | return !memcmp(ifp->hw_addr, vmac4.octet, sizeof(vmac4.octet) - 1) | |
148 | || !memcmp(ifp->hw_addr, vmac6.octet, sizeof(vmac6.octet) - 1); | |
149 | } | |
150 | ||
151 | /* | |
152 | * Lookup a Virtual Router instance given a macvlan subinterface. | |
153 | * | |
154 | * The VRID is extracted from the interface MAC and the 2-tuple (iface, vrid) | |
155 | * is used to look up any existing instances that match the interface. It does | |
156 | * not matter whether the instance is already bound to the interface or not. | |
157 | * | |
158 | * mvl_ifp | |
159 | * Interface pointer to use to lookup. Should be a macvlan device. | |
160 | * | |
161 | * Returns: | |
162 | * Virtual Router, if found | |
163 | * NULL otherwise | |
164 | */ | |
165 | static struct vrrp_vrouter *vrrp_lookup_by_if_mvl(struct interface *mvl_ifp) | |
166 | { | |
167 | struct interface *p; | |
168 | ||
169 | if (!mvl_ifp || !mvl_ifp->link_ifindex | |
170 | || !vrrp_ifp_has_vrrp_mac(mvl_ifp)) | |
171 | return NULL; | |
172 | ||
173 | p = if_lookup_by_index(mvl_ifp->link_ifindex, VRF_DEFAULT); | |
174 | uint8_t vrid = mvl_ifp->hw_addr[5]; | |
175 | ||
176 | return vrrp_lookup(p, vrid); | |
177 | } | |
178 | ||
179 | /* | |
180 | * Lookup the Virtual Router instances configured on a particular interface. | |
181 | * | |
182 | * ifp | |
183 | * Interface pointer to use to lookup. Should not be a macvlan device. | |
184 | * | |
185 | * Returns: | |
186 | * List of virtual routers found | |
187 | */ | |
188 | static struct list *vrrp_lookup_by_if(struct interface *ifp) | |
189 | { | |
190 | struct list *l = hash_to_list(vrrp_vrouters_hash); | |
191 | struct listnode *ln, *nn; | |
192 | struct vrrp_vrouter *vr; | |
193 | ||
194 | for (ALL_LIST_ELEMENTS(l, ln, nn, vr)) | |
195 | if (vr->ifp != ifp) | |
196 | list_delete_node(l, ln); | |
197 | ||
198 | return l; | |
199 | } | |
200 | ||
201 | /* | |
202 | * Lookup any Virtual Router instances associated with a particular interface. | |
203 | * This is a combination of the results from vrrp_lookup_by_if_mvl and | |
204 | * vrrp_lookup_by_if. | |
205 | * | |
206 | * Suppose the system interface list looks like the following: | |
207 | * | |
208 | * eth0 | |
209 | * \- eth0-v0 00:00:5e:00:01:01 | |
210 | * \- eth0-v1 00:00:5e:00:02:01 | |
211 | * \- eth0-v2 00:00:5e:00:01:0a | |
212 | * | |
213 | * Passing eth0-v2 to this function will give you the VRRP instance configured | |
214 | * on eth0 with VRID 10. Passing eth0-v0 or eth0-v1 will give you the VRRP | |
215 | * instance configured on eth0 with VRID 1. Passing eth0 will give you both. | |
216 | * | |
217 | * ifp | |
218 | * Interface pointer to use to lookup. Can be any interface. | |
219 | * | |
220 | * Returns: | |
221 | * List of virtual routers found | |
222 | */ | |
223 | static struct list *vrrp_lookup_by_if_any(struct interface *ifp) | |
224 | { | |
225 | struct vrrp_vrouter *vr; | |
226 | struct list *vrs; | |
227 | ||
228 | vr = vrrp_lookup_by_if_mvl(ifp); | |
229 | vrs = vr ? list_new() : vrrp_lookup_by_if(ifp); | |
230 | ||
231 | if (vr) | |
232 | listnode_add(vrs, vr); | |
233 | ||
234 | return vrs; | |
235 | } | |
236 | ||
1d21789e QY |
237 | /* Configuration controllers ----------------------------------------------- */ |
238 | ||
6e93585e QY |
239 | void vrrp_check_start(struct vrrp_vrouter *vr) |
240 | { | |
241 | struct vrrp_router *r; | |
242 | bool start; | |
243 | ||
244 | if (vr->shutdown || vr->ifp == NULL) | |
245 | return; | |
246 | ||
247 | r = vr->v4; | |
114a413e | 248 | /* Must not already be started */ |
6e93585e | 249 | start = r->fsm.state == VRRP_STATE_INITIALIZE; |
114a413e | 250 | /* Must have a parent interface */ |
6e93585e | 251 | start = start && (vr->ifp != NULL); |
114a413e | 252 | /* Parent interface must be up */ |
b0ec34c8 | 253 | start = start && if_is_operative(vr->ifp); |
114a413e QY |
254 | /* Parent interface must have at least one v4 */ |
255 | start = start && vr->ifp->connected->count > 1; | |
256 | /* Must have a macvlan interface */ | |
6e93585e | 257 | start = start && (r->mvl_ifp != NULL); |
b0ec34c8 QY |
258 | /* Macvlan interface must be admin up */ |
259 | start = start && CHECK_FLAG(r->mvl_ifp->flags, IFF_UP); | |
114a413e | 260 | /* Must have at least one VIP configured */ |
6e93585e QY |
261 | start = start && r->addrs->count > 0; |
262 | if (start) | |
263 | vrrp_event(r, VRRP_EVENT_STARTUP); | |
264 | ||
265 | r = vr->v6; | |
114a413e | 266 | /* Must not already be started */ |
6e93585e | 267 | start = r->fsm.state == VRRP_STATE_INITIALIZE; |
114a413e | 268 | /* Must have a parent interface */ |
6e93585e | 269 | start = start && (vr->ifp != NULL); |
114a413e | 270 | /* Parent interface must be up */ |
b0ec34c8 | 271 | start = start && if_is_operative(vr->ifp); |
114a413e | 272 | /* Must have a macvlan interface */ |
6e93585e | 273 | start = start && (r->mvl_ifp != NULL); |
b0ec34c8 QY |
274 | /* Macvlan interface must be admin up */ |
275 | start = start && CHECK_FLAG(r->mvl_ifp->flags, IFF_UP); | |
114a413e QY |
276 | /* Macvlan interface must have at least two v6 */ |
277 | start = start && (r->mvl_ifp->connected->count >= 2); | |
278 | /* Macvlan interface must have a link local */ | |
279 | start = start && connected_get_linklocal(r->mvl_ifp); | |
280 | /* Must have at least one VIP configured */ | |
6e93585e QY |
281 | start = start && r->addrs->count > 0; |
282 | if (start) | |
283 | vrrp_event(r, VRRP_EVENT_STARTUP); | |
284 | } | |
285 | ||
1d21789e | 286 | void vrrp_set_priority(struct vrrp_vrouter *vr, uint8_t priority) |
c23edd74 | 287 | { |
862f2f37 | 288 | vr->priority = priority; |
bac08ded QY |
289 | vr->v4->priority = priority; |
290 | vr->v6->priority = priority; | |
c23edd74 QY |
291 | } |
292 | ||
1d21789e QY |
293 | void vrrp_set_advertisement_interval(struct vrrp_vrouter *vr, |
294 | uint16_t advertisement_interval) | |
295 | { | |
296 | if (vr->advertisement_interval == advertisement_interval) | |
297 | return; | |
298 | ||
862f2f37 QY |
299 | vr->advertisement_interval = advertisement_interval; |
300 | vrrp_recalculate_timers(vr->v4); | |
301 | vrrp_recalculate_timers(vr->v6); | |
302 | } | |
303 | ||
2cd90902 | 304 | static bool vrrp_has_ip(struct vrrp_vrouter *vr, struct ipaddr *ip) |
862f2f37 | 305 | { |
2cd90902 QY |
306 | struct vrrp_router *r = ip->ipa_type == IPADDR_V4 ? vr->v4 : vr->v6; |
307 | struct listnode *ln; | |
308 | struct ipaddr *iter; | |
862f2f37 | 309 | |
2cd90902 | 310 | for (ALL_LIST_ELEMENTS_RO(r->addrs, ln, iter)) |
e920b0b2 | 311 | if (!memcmp(&iter->ip, &ip->ip, IPADDRSZ(ip))) |
2cd90902 | 312 | return true; |
10133a59 | 313 | |
2cd90902 QY |
314 | return false; |
315 | } | |
316 | ||
6e93585e | 317 | int vrrp_add_ip(struct vrrp_router *r, struct ipaddr *ip) |
2cd90902 | 318 | { |
27fd8827 QY |
319 | int af = (ip->ipa_type == IPADDR_V6) ? AF_INET6 : AF_INET; |
320 | ||
321 | assert(r->family == af); | |
322 | ||
2cd90902 QY |
323 | if (vrrp_has_ip(r->vr, ip)) |
324 | return 0; | |
325 | ||
326 | if (!vrrp_is_owner(r->vr->ifp, ip) && r->is_owner) { | |
10133a59 | 327 | char ipbuf[INET6_ADDRSTRLEN]; |
2cd90902 | 328 | inet_ntop(r->family, &ip->ip, ipbuf, sizeof(ipbuf)); |
10133a59 QY |
329 | zlog_err( |
330 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
331 | "This VRRP router is not the address owner of %s, but is the address owner of other addresses; this config is unsupported.", | |
2cd90902 QY |
332 | r->vr->vrid, ipbuf); |
333 | return -1; | |
10133a59 QY |
334 | } |
335 | ||
72df9d93 | 336 | struct ipaddr *new = XCALLOC(MTYPE_VRRP_IP, sizeof(struct ipaddr)); |
2cd90902 QY |
337 | |
338 | *new = *ip; | |
339 | listnode_add(r->addrs, new); | |
340 | ||
6e93585e | 341 | if (r->fsm.state == VRRP_STATE_MASTER) { |
2cd90902 QY |
342 | switch (r->family) { |
343 | case AF_INET: | |
344 | vrrp_garp_send(r, &new->ipaddr_v4); | |
345 | break; | |
346 | case AF_INET6: | |
347 | vrrp_ndisc_una_send(r, new); | |
348 | break; | |
349 | } | |
350 | } | |
351 | ||
6e93585e | 352 | return 0; |
2cd90902 QY |
353 | } |
354 | ||
6e93585e | 355 | int vrrp_add_ipv4(struct vrrp_vrouter *vr, struct in_addr v4) |
2cd90902 QY |
356 | { |
357 | struct ipaddr ip; | |
358 | ip.ipa_type = IPADDR_V4; | |
359 | ip.ipaddr_v4 = v4; | |
6e93585e | 360 | return vrrp_add_ip(vr->v4, &ip); |
2cd90902 QY |
361 | } |
362 | ||
6e93585e | 363 | int vrrp_add_ipv6(struct vrrp_vrouter *vr, struct in6_addr v6) |
2cd90902 QY |
364 | { |
365 | struct ipaddr ip; | |
366 | ip.ipa_type = IPADDR_V6; | |
367 | ip.ipaddr_v6 = v6; | |
6e93585e | 368 | return vrrp_add_ip(vr->v6, &ip); |
1d21789e QY |
369 | } |
370 | ||
6e93585e | 371 | int vrrp_del_ip(struct vrrp_router *r, struct ipaddr *ip) |
c23edd74 | 372 | { |
2cd90902 QY |
373 | struct listnode *ln, *nn; |
374 | struct ipaddr *iter; | |
375 | int ret = 0; | |
c23edd74 | 376 | |
2cd90902 QY |
377 | if (!vrrp_has_ip(r->vr, ip)) |
378 | return 0; | |
10133a59 | 379 | |
6e93585e QY |
380 | for (ALL_LIST_ELEMENTS(r->addrs, ln, nn, iter)) |
381 | if (!memcmp(&iter->ip, &ip->ip, IPADDRSZ(ip))) | |
382 | list_delete_node(r->addrs, ln); | |
2cd90902 QY |
383 | |
384 | /* | |
6e93585e QY |
385 | * NB: Deleting the last address and then issuing a shutdown will cause |
386 | * transmission of a priority 0 VRRP Advertisement - as per the RFC - | |
387 | * but it will have no addresses. This is not forbidden in the RFC but | |
388 | * might confuse other implementations. | |
2cd90902 | 389 | */ |
6e93585e QY |
390 | if (r->addrs->count == 0 && r->fsm.state != VRRP_STATE_INITIALIZE) |
391 | ret = vrrp_event(r, VRRP_EVENT_SHUTDOWN); | |
10133a59 | 392 | |
2cd90902 QY |
393 | return ret; |
394 | } | |
4f52e9a6 | 395 | |
6e93585e | 396 | int vrrp_del_ipv6(struct vrrp_vrouter *vr, struct in6_addr v6) |
2cd90902 QY |
397 | { |
398 | struct ipaddr ip; | |
399 | ip.ipa_type = IPADDR_V6; | |
400 | ip.ipaddr_v6 = v6; | |
6e93585e | 401 | return vrrp_del_ip(vr->v6, &ip); |
862f2f37 QY |
402 | } |
403 | ||
6e93585e | 404 | int vrrp_del_ipv4(struct vrrp_vrouter *vr, struct in_addr v4) |
862f2f37 | 405 | { |
2cd90902 QY |
406 | struct ipaddr ip; |
407 | ip.ipa_type = IPADDR_V4; | |
408 | ip.ipaddr_v4 = v4; | |
6e93585e | 409 | return vrrp_del_ip(vr->v4, &ip); |
c23edd74 QY |
410 | } |
411 | ||
1d21789e QY |
412 | |
413 | /* Creation and destruction ------------------------------------------------ */ | |
414 | ||
6287cefe QY |
415 | static void vrrp_router_addr_list_del_cb(void *val) |
416 | { | |
417 | struct ipaddr *ip = val; | |
72df9d93 | 418 | XFREE(MTYPE_VRRP_IP, ip); |
6287cefe QY |
419 | } |
420 | ||
85467974 QY |
421 | /* |
422 | * Search for a suitable macvlan subinterface we can attach to, and if found, | |
423 | * attach to it. | |
424 | * | |
425 | * r | |
426 | * Router to attach to interface | |
427 | * | |
428 | * Returns: | |
429 | * Whether an interface was successfully attached | |
430 | */ | |
431 | static bool vrrp_attach_interface(struct vrrp_router *r) | |
862f2f37 | 432 | { |
dad18a2f QY |
433 | /* Search for existing interface with computed MAC address */ |
434 | struct interface **ifps; | |
435 | size_t ifps_cnt = if_lookup_by_hwaddr( | |
436 | r->vmac.octet, sizeof(r->vmac.octet), &ifps, VRF_DEFAULT); | |
437 | ||
438 | /* | |
1b1f3c43 QY |
439 | * Filter to only those macvlan interfaces whose parent is the base |
440 | * interface this VRRP router is configured on. | |
dad18a2f QY |
441 | * |
442 | * If there are still multiple interfaces we just select the first one, | |
443 | * as it should be functionally identical to the others. | |
444 | */ | |
445 | unsigned int candidates = 0; | |
446 | struct interface *selection = NULL; | |
447 | for (unsigned int i = 0; i < ifps_cnt; i++) { | |
b0ec34c8 | 448 | if (ifps[i]->link_ifindex != r->vr->ifp->ifindex) |
dad18a2f QY |
449 | ifps[i] = NULL; |
450 | else { | |
451 | selection = selection ? selection : ifps[i]; | |
452 | candidates++; | |
453 | } | |
454 | } | |
455 | ||
b79640e4 QY |
456 | if (ifps_cnt) |
457 | XFREE(MTYPE_TMP, ifps); | |
dad18a2f QY |
458 | |
459 | char ethstr[ETHER_ADDR_STRLEN]; | |
460 | prefix_mac2str(&r->vmac, ethstr, sizeof(ethstr)); | |
461 | ||
462 | assert(!!selection == !!candidates); | |
463 | ||
464 | if (candidates == 0) | |
465 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
e6341d21 QY |
466 | "%s interface: None (no interface found w/ MAC %s)", |
467 | r->vr->vrid, family2str(r->family), ethstr); | |
dad18a2f QY |
468 | else if (candidates > 1) |
469 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
e6341d21 QY |
470 | "%s interface: Multiple interfaces found; using %s", |
471 | r->vr->vrid, family2str(r->family), selection->name); | |
dad18a2f | 472 | else |
e6341d21 QY |
473 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID "%s interface: %s", |
474 | r->vr->vrid, family2str(r->family), selection->name); | |
dad18a2f | 475 | |
7e205b4a | 476 | r->mvl_ifp = selection; |
dad18a2f | 477 | |
85467974 QY |
478 | return !!r->mvl_ifp; |
479 | ||
480 | } | |
481 | ||
482 | static struct vrrp_router *vrrp_router_create(struct vrrp_vrouter *vr, | |
483 | int family) | |
484 | { | |
72df9d93 QY |
485 | struct vrrp_router *r = |
486 | XCALLOC(MTYPE_VRRP_RTR, sizeof(struct vrrp_router)); | |
85467974 QY |
487 | |
488 | r->family = family; | |
489 | r->sock_rx = -1; | |
490 | r->sock_tx = -1; | |
491 | r->vr = vr; | |
492 | r->addrs = list_new(); | |
493 | r->addrs->del = vrrp_router_addr_list_del_cb; | |
494 | r->priority = vr->priority; | |
495 | r->fsm.state = VRRP_STATE_INITIALIZE; | |
496 | vrrp_mac_set(&r->vmac, family == AF_INET6, vr->vrid); | |
497 | ||
498 | vrrp_attach_interface(r); | |
499 | ||
862f2f37 QY |
500 | return r; |
501 | } | |
502 | ||
503 | static void vrrp_router_destroy(struct vrrp_router *r) | |
504 | { | |
6287cefe QY |
505 | if (r->is_active) |
506 | vrrp_event(r, VRRP_EVENT_SHUTDOWN); | |
507 | ||
dad18a2f QY |
508 | if (r->sock_rx >= 0) |
509 | close(r->sock_rx); | |
510 | if (r->sock_tx >= 0) | |
511 | close(r->sock_tx); | |
6287cefe | 512 | |
862f2f37 QY |
513 | /* FIXME: also delete list elements */ |
514 | list_delete(&r->addrs); | |
72df9d93 | 515 | XFREE(MTYPE_VRRP_RTR, r); |
862f2f37 QY |
516 | } |
517 | ||
99966840 QY |
518 | struct vrrp_vrouter *vrrp_vrouter_create(struct interface *ifp, uint8_t vrid, |
519 | uint8_t version) | |
5435a2bf | 520 | { |
4f0b6b45 | 521 | struct vrrp_vrouter *vr = vrrp_lookup(ifp, vrid); |
6287cefe QY |
522 | |
523 | if (vr) | |
524 | return vr; | |
525 | ||
99966840 QY |
526 | if (version != 2 && version != 3) |
527 | return NULL; | |
528 | ||
72df9d93 | 529 | vr = XCALLOC(MTYPE_VRRP_RTR, sizeof(struct vrrp_vrouter)); |
5435a2bf | 530 | |
5435a2bf | 531 | vr->ifp = ifp; |
99966840 | 532 | vr->version = version; |
5435a2bf | 533 | vr->vrid = vrid; |
5435a2bf | 534 | vr->priority = VRRP_DEFAULT_PRIORITY; |
5435a2bf QY |
535 | vr->preempt_mode = true; |
536 | vr->accept_mode = false; | |
862f2f37 QY |
537 | |
538 | vr->v4 = vrrp_router_create(vr, AF_INET); | |
539 | vr->v6 = vrrp_router_create(vr, AF_INET6); | |
540 | ||
1485d9e5 | 541 | vrrp_set_advertisement_interval(vr, VRRP_DEFAULT_ADVINT); |
5435a2bf QY |
542 | |
543 | hash_get(vrrp_vrouters_hash, vr, hash_alloc_intern); | |
544 | ||
545 | return vr; | |
546 | } | |
547 | ||
c23edd74 QY |
548 | void vrrp_vrouter_destroy(struct vrrp_vrouter *vr) |
549 | { | |
862f2f37 QY |
550 | vrrp_router_destroy(vr->v4); |
551 | vrrp_router_destroy(vr->v6); | |
c23edd74 | 552 | hash_release(vrrp_vrouters_hash, vr); |
72df9d93 | 553 | XFREE(MTYPE_VRRP_RTR, vr); |
c23edd74 QY |
554 | } |
555 | ||
4f0b6b45 | 556 | struct vrrp_vrouter *vrrp_lookup(struct interface *ifp, uint8_t vrid) |
5435a2bf QY |
557 | { |
558 | struct vrrp_vrouter vr; | |
559 | vr.vrid = vrid; | |
4f0b6b45 | 560 | vr.ifp = ifp; |
5435a2bf QY |
561 | |
562 | return hash_lookup(vrrp_vrouters_hash, &vr); | |
563 | } | |
564 | ||
565 | /* Network ----------------------------------------------------------------- */ | |
566 | ||
10133a59 QY |
567 | /* Forward decls */ |
568 | static void vrrp_change_state(struct vrrp_router *r, int to); | |
569 | static int vrrp_adver_timer_expire(struct thread *thread); | |
570 | static int vrrp_master_down_timer_expire(struct thread *thread); | |
571 | ||
5435a2bf | 572 | /* |
91188ca6 | 573 | * Create and multicast a VRRP ADVERTISEMENT message. |
5435a2bf | 574 | * |
862f2f37 QY |
575 | * r |
576 | * VRRP Router for which to send ADVERTISEMENT | |
5435a2bf | 577 | */ |
862f2f37 | 578 | static void vrrp_send_advertisement(struct vrrp_router *r) |
5435a2bf | 579 | { |
247aa469 | 580 | struct vrrp_pkt *pkt; |
d9e01e1c | 581 | ssize_t pktsz; |
862f2f37 QY |
582 | struct ipaddr *addrs[r->addrs->count]; |
583 | union sockunion dest; | |
247aa469 | 584 | |
862f2f37 | 585 | list_to_array(r->addrs, (void **)addrs, r->addrs->count); |
247aa469 | 586 | |
99966840 QY |
587 | pktsz = vrrp_pkt_adver_build(&pkt, &r->src, r->vr->version, r->vr->vrid, |
588 | r->priority, r->vr->advertisement_interval, | |
d9e01e1c | 589 | r->addrs->count, (struct ipaddr **)&addrs); |
247aa469 | 590 | |
b637bcd4 QY |
591 | if (DEBUG_MODE_CHECK(&vrrp_dbg_pkt, DEBUG_MODE_ALL)) |
592 | zlog_hexdump(pkt, (size_t)pktsz); | |
247aa469 | 593 | |
862f2f37 QY |
594 | const char *group = |
595 | r->family == AF_INET ? VRRP_MCASTV4_GROUP_STR : VRRP_MCASTV6_GROUP_STR; | |
596 | str2sockunion(group, &dest); | |
247aa469 | 597 | |
d9e01e1c | 598 | ssize_t sent = sendto(r->sock_tx, pkt, (size_t)pktsz, 0, &dest.sa, |
862f2f37 | 599 | sockunion_sizeof(&dest)); |
4ec94408 | 600 | |
72df9d93 | 601 | XFREE(MTYPE_VRRP_PKT, pkt); |
bb54fa3a | 602 | |
4ec94408 QY |
603 | if (sent < 0) { |
604 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
8071d5c3 QY |
605 | "Failed to send VRRP Advertisement: %s", |
606 | r->vr->vrid, safe_strerror(errno)); | |
4ec94408 | 607 | } |
5435a2bf QY |
608 | } |
609 | ||
10133a59 QY |
610 | /* |
611 | * Receive and parse VRRP advertisement. | |
612 | * | |
613 | * By the time we get here all fields have been validated for basic correctness | |
614 | * and the packet is a valid VRRP packet. | |
615 | * | |
616 | * However, we have not validated whether the VRID is correct for this virtual | |
617 | * router, nor whether the priority is correct (i.e. is not 255 when we are the | |
99966840 QY |
618 | * address owner), nor whether the advertisement interval equals our own |
619 | * configured value (this check is only performed in VRRPv2). | |
0f1f98e8 QY |
620 | * |
621 | * r | |
622 | * VRRP Router associated with the socket this advertisement was received on | |
623 | * | |
624 | * src | |
625 | * Source address of sender | |
626 | * | |
627 | * pkt | |
628 | * The advertisement they sent | |
629 | * | |
630 | * pktsize | |
631 | * Size of advertisement | |
632 | * | |
633 | * Returns: | |
634 | * -1 if advertisement is invalid | |
635 | * 0 otherwise | |
10133a59 | 636 | */ |
0f1f98e8 QY |
637 | static int vrrp_recv_advertisement(struct vrrp_router *r, struct ipaddr *src, |
638 | struct vrrp_pkt *pkt, size_t pktsize) | |
5435a2bf | 639 | { |
3708883c QY |
640 | char sipstr[INET6_ADDRSTRLEN]; |
641 | ipaddr2str(src, sipstr, sizeof(sipstr)); | |
642 | ||
91188ca6 | 643 | char dumpbuf[BUFSIZ]; |
d9e01e1c | 644 | vrrp_pkt_adver_dump(dumpbuf, sizeof(dumpbuf), pkt); |
b637bcd4 QY |
645 | DEBUGD(&vrrp_dbg_proto, |
646 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
647 | "Received VRRP Advertisement from %s:\n%s", | |
648 | r->vr->vrid, sipstr, dumpbuf); | |
10133a59 QY |
649 | |
650 | /* Check that VRID matches our configured VRID */ | |
651 | if (pkt->hdr.vrid != r->vr->vrid) { | |
b637bcd4 QY |
652 | DEBUGD(&vrrp_dbg_proto, |
653 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
654 | "%s datagram invalid: Advertisement contains VRID %" PRIu8 | |
655 | " which does not match our instance", | |
656 | r->vr->vrid, family2str(r->family), pkt->hdr.vrid); | |
10133a59 QY |
657 | return -1; |
658 | } | |
659 | ||
660 | /* Verify that we are not the IPvX address owner */ | |
661 | if (r->is_owner) { | |
b637bcd4 QY |
662 | DEBUGD(&vrrp_dbg_proto, |
663 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
664 | "%s datagram invalid: Received advertisement but we are the address owner", | |
665 | r->vr->vrid, family2str(r->family)); | |
10133a59 QY |
666 | return -1; |
667 | } | |
668 | ||
99966840 QY |
669 | /* If v2, verify that adver time matches ours */ |
670 | bool adveq = (pkt->hdr.v2.adver_int | |
671 | == MAX(r->vr->advertisement_interval / 100, 1)); | |
672 | if (r->vr->version == 2 && !adveq) { | |
b637bcd4 QY |
673 | DEBUGD(&vrrp_dbg_proto, |
674 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
675 | "%s datagram invalid: Received advertisement with advertisement interval %" PRIu8 | |
676 | " unequal to our configured value %u", | |
677 | r->vr->vrid, family2str(r->family), | |
678 | pkt->hdr.v2.adver_int, | |
679 | MAX(r->vr->advertisement_interval / 100, 1)); | |
99966840 QY |
680 | return -1; |
681 | } | |
682 | ||
683 | ||
10133a59 | 684 | /* Check that # IPs received matches our # configured IPs */ |
b637bcd4 QY |
685 | if (pkt->hdr.naddr != r->addrs->count) |
686 | DEBUGD(&vrrp_dbg_proto, | |
687 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
688 | "%s datagram has %" PRIu8 | |
689 | " addresses, but this VRRP instance has %u", | |
690 | r->vr->vrid, family2str(r->family), pkt->hdr.naddr, | |
691 | r->addrs->count); | |
10133a59 | 692 | |
0f1f98e8 | 693 | int addrcmp; |
0f1f98e8 | 694 | |
10133a59 QY |
695 | switch (r->fsm.state) { |
696 | case VRRP_STATE_MASTER: | |
e920b0b2 | 697 | addrcmp = memcmp(&src->ip, &r->src.ip, IPADDRSZ(src)); |
0f1f98e8 | 698 | |
10133a59 QY |
699 | if (pkt->hdr.priority == 0) { |
700 | vrrp_send_advertisement(r); | |
701 | THREAD_OFF(r->t_adver_timer); | |
702 | thread_add_timer_msec( | |
703 | master, vrrp_adver_timer_expire, r, | |
704 | r->vr->advertisement_interval * 10, | |
705 | &r->t_adver_timer); | |
0f1f98e8 QY |
706 | } else if (pkt->hdr.priority > r->priority |
707 | || ((pkt->hdr.priority == r->priority) && addrcmp > 0)) { | |
3708883c QY |
708 | zlog_info( |
709 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
710 | "Received advertisement from %s w/ priority %" PRIu8 | |
711 | "; switching to Backup", | |
712 | r->vr->vrid, sipstr, pkt->hdr.priority); | |
10133a59 | 713 | THREAD_OFF(r->t_adver_timer); |
99966840 QY |
714 | if (r->vr->version == 3) { |
715 | r->master_adver_interval = | |
716 | htons(pkt->hdr.v3.adver_int); | |
717 | } | |
10133a59 QY |
718 | vrrp_recalculate_timers(r); |
719 | THREAD_OFF(r->t_master_down_timer); | |
720 | thread_add_timer_msec(master, | |
721 | vrrp_master_down_timer_expire, r, | |
722 | r->master_down_interval * 10, | |
723 | &r->t_master_down_timer); | |
724 | vrrp_change_state(r, VRRP_STATE_BACKUP); | |
725 | } else { | |
726 | /* Discard advertisement */ | |
b637bcd4 QY |
727 | DEBUGD(&vrrp_dbg_proto, |
728 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
729 | "Discarding advertisement from %s", | |
730 | r->vr->vrid, sipstr); | |
10133a59 QY |
731 | } |
732 | break; | |
733 | case VRRP_STATE_BACKUP: | |
734 | if (pkt->hdr.priority == 0) { | |
735 | THREAD_OFF(r->t_master_down_timer); | |
736 | thread_add_timer_msec( | |
737 | master, vrrp_master_down_timer_expire, r, | |
738 | r->skew_time * 10, &r->t_master_down_timer); | |
739 | } else if (r->vr->preempt_mode == false | |
740 | || pkt->hdr.priority >= r->priority) { | |
99966840 QY |
741 | if (r->vr->version == 3) { |
742 | r->master_adver_interval = | |
743 | ntohs(pkt->hdr.v3.adver_int); | |
744 | } | |
10133a59 QY |
745 | vrrp_recalculate_timers(r); |
746 | THREAD_OFF(r->t_master_down_timer); | |
747 | thread_add_timer_msec(master, | |
748 | vrrp_master_down_timer_expire, r, | |
749 | r->master_down_interval * 10, | |
750 | &r->t_master_down_timer); | |
751 | } else if (r->vr->preempt_mode == true | |
752 | && pkt->hdr.priority < r->priority) { | |
753 | /* Discard advertisement */ | |
b637bcd4 QY |
754 | DEBUGD(&vrrp_dbg_proto, |
755 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
756 | "Discarding advertisement from %s", | |
757 | r->vr->vrid, sipstr); | |
10133a59 QY |
758 | } |
759 | break; | |
760 | case VRRP_STATE_INITIALIZE: | |
761 | zlog_err(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
762 | "Received ADVERTISEMENT in state %s; this is a bug", | |
763 | r->vr->vrid, vrrp_state_names[r->fsm.state]); | |
764 | break; | |
765 | } | |
766 | ||
767 | return 0; | |
91188ca6 QY |
768 | } |
769 | ||
770 | /* | |
771 | * Read and process next IPvX datagram. | |
772 | */ | |
773 | static int vrrp_read(struct thread *thread) | |
774 | { | |
775 | struct vrrp_router *r = thread->arg; | |
776 | ||
777 | struct vrrp_pkt *pkt; | |
778 | ssize_t pktsize; | |
779 | ssize_t nbytes; | |
780 | bool resched; | |
781 | char errbuf[BUFSIZ]; | |
fa211f1c | 782 | struct sockaddr_storage sa; |
91188ca6 | 783 | uint8_t control[64]; |
d04bb25a | 784 | struct ipaddr src = {}; |
91188ca6 QY |
785 | |
786 | struct msghdr m; | |
787 | struct iovec iov; | |
788 | iov.iov_base = r->ibuf; | |
789 | iov.iov_len = sizeof(r->ibuf); | |
fa211f1c QY |
790 | m.msg_name = &sa; |
791 | m.msg_namelen = sizeof(sa); | |
91188ca6 QY |
792 | m.msg_iov = &iov; |
793 | m.msg_iovlen = 1; | |
794 | m.msg_control = control; | |
795 | m.msg_controllen = sizeof(control); | |
796 | ||
dad18a2f | 797 | nbytes = recvmsg(r->sock_rx, &m, MSG_DONTWAIT); |
91188ca6 QY |
798 | |
799 | if ((nbytes < 0 && ERRNO_IO_RETRY(errno))) { | |
800 | resched = true; | |
801 | goto done; | |
802 | } else if (nbytes <= 0) { | |
803 | vrrp_event(r, VRRP_EVENT_SHUTDOWN); | |
804 | resched = false; | |
805 | goto done; | |
806 | } | |
807 | ||
b637bcd4 QY |
808 | if (DEBUG_MODE_CHECK(&vrrp_dbg_pkt, DEBUG_MODE_ALL)) { |
809 | DEBUGD(&vrrp_dbg_pkt, | |
810 | VRRP_LOGPFX VRRP_LOGPFX_VRID "Received %s datagram: ", | |
811 | r->vr->vrid, family2str(r->family)); | |
812 | zlog_hexdump(r->ibuf, nbytes); | |
813 | } | |
91188ca6 | 814 | |
8cb3d803 QY |
815 | pktsize = vrrp_pkt_parse_datagram(r->family, r->vr->version, &m, nbytes, |
816 | &src, &pkt, errbuf, sizeof(errbuf)); | |
91188ca6 QY |
817 | |
818 | if (pktsize < 0) { | |
b637bcd4 QY |
819 | DEBUGD(&vrrp_dbg_pkt, |
820 | VRRP_LOGPFX VRRP_LOGPFX_VRID "%s datagram invalid: %s", | |
821 | r->vr->vrid, family2str(r->family), errbuf); | |
91188ca6 | 822 | } else { |
b637bcd4 QY |
823 | DEBUGD(&vrrp_dbg_pkt, |
824 | VRRP_LOGPFX VRRP_LOGPFX_VRID "Packet looks good", | |
825 | r->vr->vrid); | |
0f1f98e8 | 826 | vrrp_recv_advertisement(r, &src, pkt, pktsize); |
91188ca6 QY |
827 | } |
828 | ||
829 | resched = true; | |
830 | ||
831 | done: | |
832 | memset(r->ibuf, 0x00, sizeof(r->ibuf)); | |
833 | ||
834 | if (resched) | |
dad18a2f QY |
835 | thread_add_read(master, vrrp_read, r, r->sock_rx, &r->t_read); |
836 | ||
837 | return 0; | |
838 | } | |
839 | ||
840 | /* | |
841 | * Finds the first connected address of the appropriate family on a VRRP | |
842 | * router's interface and binds the Tx socket of the VRRP router to that | |
843 | * address. | |
844 | * | |
8071d5c3 QY |
845 | * Also sets src field of vrrp_router. |
846 | * | |
dad18a2f QY |
847 | * r |
848 | * VRRP router to operate on | |
849 | * | |
850 | * Returns: | |
851 | * 0 on success | |
852 | * -1 on failure | |
853 | */ | |
854 | static int vrrp_bind_to_primary_connected(struct vrrp_router *r) | |
855 | { | |
856 | char ipstr[INET6_ADDRSTRLEN]; | |
7e205b4a QY |
857 | struct interface *ifp; |
858 | ||
859 | /* | |
860 | * A slight quirk: the RFC specifies that advertisements under IPv6 must | |
861 | * be transmitted using the link local address of the source interface | |
862 | */ | |
863 | ifp = r->family == AF_INET ? r->vr->ifp : r->mvl_ifp; | |
dad18a2f QY |
864 | |
865 | struct listnode *ln; | |
866 | struct connected *c = NULL; | |
7e205b4a | 867 | for (ALL_LIST_ELEMENTS_RO(ifp->connected, ln, c)) |
22e4b6a7 QY |
868 | if (c->address->family == r->family) { |
869 | if (r->family == AF_INET6 | |
870 | && IN6_IS_ADDR_LINKLOCAL(&c->address->u.prefix6)) | |
871 | break; | |
872 | else if (r->family == AF_INET) | |
873 | break; | |
874 | } | |
dad18a2f QY |
875 | |
876 | if (c == NULL) { | |
877 | zlog_err(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
878 | "Failed to find %s address to bind on %s", | |
7e205b4a | 879 | r->vr->vrid, family2str(r->family), ifp->name); |
dad18a2f QY |
880 | return -1; |
881 | } | |
882 | ||
7e205b4a QY |
883 | union sockunion su; |
884 | memset(&su, 0x00, sizeof(su)); | |
dad18a2f | 885 | |
7e205b4a QY |
886 | switch (r->family) { |
887 | case AF_INET: | |
8071d5c3 QY |
888 | r->src.ipa_type = IPADDR_V4; |
889 | r->src.ipaddr_v4 = c->address->u.prefix4; | |
7e205b4a QY |
890 | su.sin.sin_family = AF_INET; |
891 | su.sin.sin_addr = c->address->u.prefix4; | |
892 | break; | |
893 | case AF_INET6: | |
8071d5c3 QY |
894 | r->src.ipa_type = IPADDR_V6; |
895 | r->src.ipaddr_v6 = c->address->u.prefix6; | |
7e205b4a QY |
896 | su.sin6.sin6_family = AF_INET6; |
897 | su.sin6.sin6_scope_id = ifp->ifindex; | |
898 | su.sin6.sin6_addr = c->address->u.prefix6; | |
899 | break; | |
900 | } | |
dad18a2f QY |
901 | |
902 | sockopt_reuseaddr(r->sock_tx); | |
7e205b4a | 903 | if (bind(r->sock_tx, (const struct sockaddr *)&su, sizeof(su)) < 0) { |
dad18a2f QY |
904 | zlog_err( |
905 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
906 | "Failed to bind Tx socket to primary IP address %s: %s", | |
907 | r->vr->vrid, | |
908 | inet_ntop(r->family, | |
909 | (const void *)&c->address->u.prefix, ipstr, | |
910 | sizeof(ipstr)), | |
911 | safe_strerror(errno)); | |
912 | return -1; | |
913 | } else { | |
b637bcd4 QY |
914 | DEBUGD(&vrrp_dbg_sock, |
915 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
916 | "Bound Tx socket to primary IP address %s", | |
917 | r->vr->vrid, | |
918 | inet_ntop(r->family, (const void *)&c->address->u.prefix, | |
919 | ipstr, sizeof(ipstr))); | |
dad18a2f | 920 | } |
91188ca6 QY |
921 | |
922 | return 0; | |
5435a2bf | 923 | } |
5435a2bf QY |
924 | |
925 | /* | |
dad18a2f QY |
926 | * Creates and configures VRRP router sockets. |
927 | * | |
928 | * This function: | |
929 | * - Creates two sockets, one for Tx, one for Rx | |
930 | * - Joins the Rx socket to the appropriate VRRP multicast group | |
931 | * - Sets the Tx socket to set the TTL (v4) or Hop Limit (v6) field to 255 for | |
932 | * all transmitted IPvX packets | |
933 | * - Requests the kernel to deliver IPv6 header values needed to validate VRRP | |
934 | * packets | |
dad18a2f QY |
935 | * |
936 | * If any of the above fail, the sockets are closed. The only exception is if | |
937 | * the TTL / Hop Limit settings fail; these are logged, but configuration | |
938 | * proceeds. | |
5435a2bf QY |
939 | * |
940 | * The first connected address on the Virtual Router's interface is used as the | |
941 | * interface address. | |
942 | * | |
862f2f37 QY |
943 | * r |
944 | * VRRP Router for which to create listen socket | |
dad18a2f QY |
945 | * |
946 | * Returns: | |
947 | * 0 on success | |
948 | * -1 on failure | |
5435a2bf | 949 | */ |
862f2f37 | 950 | static int vrrp_socket(struct vrrp_router *r) |
5435a2bf | 951 | { |
5435a2bf | 952 | int ret; |
91188ca6 | 953 | bool failed = false; |
5435a2bf | 954 | |
dad18a2f QY |
955 | frr_elevate_privs(&vrrp_privs) |
956 | { | |
957 | r->sock_rx = socket(r->family, SOCK_RAW, IPPROTO_VRRP); | |
958 | r->sock_tx = socket(r->family, SOCK_RAW, IPPROTO_VRRP); | |
5435a2bf QY |
959 | } |
960 | ||
dad18a2f QY |
961 | if (r->sock_rx < 0 || r->sock_tx < 0) { |
962 | const char *rxtx = r->sock_rx < 0 ? "Rx" : "Tx"; | |
4ec94408 | 963 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID |
dad18a2f QY |
964 | "Can't create %s VRRP %s socket", |
965 | r->vr->vrid, family2str(r->family), rxtx); | |
91188ca6 QY |
966 | failed = true; |
967 | goto done; | |
4ec94408 | 968 | } |
40744000 | 969 | |
dad18a2f | 970 | /* Configure sockets */ |
91188ca6 | 971 | if (r->family == AF_INET) { |
dad18a2f | 972 | /* Set Tx socket to always Tx with TTL set to 255 */ |
91188ca6 | 973 | int ttl = 255; |
dad18a2f | 974 | ret = setsockopt(r->sock_tx, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, |
91188ca6 QY |
975 | sizeof(ttl)); |
976 | if (ret < 0) { | |
977 | zlog_warn( | |
978 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
979 | "Failed to set outgoing multicast TTL count to 255; RFC 5798 compliant implementations will drop our packets", | |
980 | r->vr->vrid); | |
981 | } | |
982 | ||
6ad94d3a QY |
983 | /* Set Tx socket DSCP byte */ |
984 | setsockopt_ipv4_tos(r->sock_tx, IPTOS_PREC_INTERNETCONTROL); | |
985 | ||
6e9529ed QY |
986 | /* Turn off multicast loop on Tx */ |
987 | setsockopt_ipv4_multicast_loop(r->sock_tx, 0); | |
988 | ||
b523b241 QY |
989 | /* Bind Rx socket to exact interface */ |
990 | vrrp_privs.change(ZPRIVS_RAISE); | |
991 | { | |
992 | ret = setsockopt(r->sock_rx, SOL_SOCKET, | |
993 | SO_BINDTODEVICE, r->vr->ifp->name, | |
994 | strlen(r->vr->ifp->name)); | |
995 | } | |
996 | vrrp_privs.change(ZPRIVS_LOWER); | |
997 | if (ret) { | |
998 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
999 | "Failed to bind Rx socket to %s: %s", | |
1000 | r->vr->vrid, r->vr->ifp->name, | |
1001 | safe_strerror(errno)); | |
1002 | failed = true; | |
1003 | goto done; | |
1004 | } | |
b637bcd4 QY |
1005 | DEBUGD(&vrrp_dbg_sock, |
1006 | VRRP_LOGPFX VRRP_LOGPFX_VRID "Bound Rx socket to %s", | |
1007 | r->vr->vrid, r->vr->ifp->name); | |
b523b241 QY |
1008 | |
1009 | /* Bind Rx socket to v4 multicast address */ | |
1010 | struct sockaddr_in sa = {0}; | |
1011 | sa.sin_family = AF_INET; | |
1012 | sa.sin_addr.s_addr = htonl(VRRP_MCASTV4_GROUP); | |
1013 | if (bind(r->sock_rx, (struct sockaddr *)&sa, sizeof(sa))) { | |
1014 | zlog_err( | |
1015 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1016 | "Failed to bind Rx socket to VRRP %s multicast group: %s", | |
1017 | r->vr->vrid, family2str(r->family), | |
1018 | safe_strerror(errno)); | |
1019 | failed = true; | |
1020 | goto done; | |
1021 | } | |
b637bcd4 QY |
1022 | DEBUGD(&vrrp_dbg_sock, |
1023 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1024 | "Bound Rx socket to VRRP %s multicast group", | |
1025 | r->vr->vrid, family2str(r->family)); | |
b523b241 | 1026 | |
dad18a2f QY |
1027 | /* Join Rx socket to VRRP IPv4 multicast group */ |
1028 | struct connected *c = listhead(r->vr->ifp->connected)->data; | |
91188ca6 | 1029 | struct in_addr v4 = c->address->u.prefix4; |
dad18a2f QY |
1030 | ret = setsockopt_ipv4_multicast(r->sock_rx, IP_ADD_MEMBERSHIP, |
1031 | v4, htonl(VRRP_MCASTV4_GROUP), | |
862f2f37 | 1032 | r->vr->ifp->ifindex); |
b523b241 QY |
1033 | if (ret < 0) { |
1034 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1035 | "Failed to join VRRP %s multicast group", | |
1036 | r->vr->vrid, family2str(r->family)); | |
1037 | failed = true; | |
1038 | goto done; | |
1039 | } | |
b637bcd4 QY |
1040 | DEBUGD(&vrrp_dbg_sock, |
1041 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1042 | "Joined %s VRRP multicast group", | |
1043 | r->vr->vrid, family2str(r->family)); | |
7e205b4a QY |
1044 | |
1045 | /* Set outgoing interface for advertisements */ | |
1046 | struct ip_mreqn mreqn = {}; | |
1047 | mreqn.imr_ifindex = r->mvl_ifp->ifindex; | |
1048 | ret = setsockopt(r->sock_tx, IPPROTO_IP, IP_MULTICAST_IF, | |
1049 | (void *)&mreqn, sizeof(mreqn)); | |
1050 | if (ret < 0) { | |
1051 | zlog_warn( | |
1052 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1053 | "Could not set %s as outgoing multicast interface", | |
1054 | r->vr->vrid, r->mvl_ifp->name); | |
1055 | failed = true; | |
1056 | goto done; | |
1057 | } | |
b637bcd4 QY |
1058 | DEBUGD(&vrrp_dbg_sock, |
1059 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1060 | "Set %s as outgoing multicast interface", | |
1061 | r->vr->vrid, r->mvl_ifp->name); | |
91188ca6 | 1062 | } else if (r->family == AF_INET6) { |
dad18a2f QY |
1063 | /* Always transmit IPv6 packets with hop limit set to 255 */ |
1064 | ret = setsockopt_ipv6_multicast_hops(r->sock_tx, 255); | |
91188ca6 QY |
1065 | if (ret < 0) { |
1066 | zlog_warn( | |
1067 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1068 | "Failed to set outgoing multicast hop count to 255; RFC 5798 compliant implementations will drop our packets", | |
1069 | r->vr->vrid); | |
1070 | } | |
d04bb25a | 1071 | |
6ad94d3a QY |
1072 | /* Set Tx socket DSCP byte */ |
1073 | setsockopt_ipv6_tclass(r->sock_tx, IPTOS_PREC_INTERNETCONTROL); | |
1074 | ||
d04bb25a QY |
1075 | /* Request hop limit delivery */ |
1076 | setsockopt_ipv6_hoplimit(r->sock_rx, 1); | |
91188ca6 QY |
1077 | if (ret < 0) { |
1078 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1079 | "Failed to request IPv6 Hop Limit delivery", | |
1080 | r->vr->vrid); | |
1081 | failed = true; | |
1082 | goto done; | |
1083 | } | |
1084 | ||
6e9529ed QY |
1085 | /* Turn off multicast loop on Tx */ |
1086 | setsockopt_ipv6_multicast_loop(r->sock_tx, 0); | |
1087 | ||
b523b241 QY |
1088 | /* Bind Rx socket to exact interface */ |
1089 | vrrp_privs.change(ZPRIVS_RAISE); | |
1090 | { | |
1091 | ret = setsockopt(r->sock_rx, SOL_SOCKET, | |
1092 | SO_BINDTODEVICE, r->vr->ifp->name, | |
1093 | strlen(r->vr->ifp->name)); | |
1094 | } | |
1095 | vrrp_privs.change(ZPRIVS_LOWER); | |
1096 | if (ret) { | |
1097 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1098 | "Failed to bind Rx socket to %s: %s", | |
1099 | r->vr->vrid, r->vr->ifp->name, | |
1100 | safe_strerror(errno)); | |
1101 | failed = true; | |
1102 | goto done; | |
1103 | } | |
b637bcd4 QY |
1104 | DEBUGD(&vrrp_dbg_sock, |
1105 | VRRP_LOGPFX VRRP_LOGPFX_VRID "Bound Rx socket to %s", | |
1106 | r->vr->vrid, r->vr->ifp->name); | |
b523b241 QY |
1107 | |
1108 | /* Bind Rx socket to v6 multicast address */ | |
1109 | struct sockaddr_in6 sa = {0}; | |
1110 | sa.sin6_family = AF_INET6; | |
1111 | inet_pton(AF_INET6, VRRP_MCASTV6_GROUP_STR, &sa.sin6_addr); | |
1112 | if (bind(r->sock_rx, (struct sockaddr *)&sa, sizeof(sa))) { | |
1113 | zlog_err( | |
1114 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1115 | "Failed to bind Rx socket to VRRP %s multicast group: %s", | |
1116 | r->vr->vrid, family2str(r->family), | |
1117 | safe_strerror(errno)); | |
1118 | failed = true; | |
1119 | goto done; | |
1120 | } | |
b637bcd4 QY |
1121 | DEBUGD(&vrrp_dbg_sock, |
1122 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1123 | "Bound Rx socket to VRRP %s multicast group", | |
1124 | r->vr->vrid, family2str(r->family)); | |
b523b241 | 1125 | |
91188ca6 | 1126 | /* Join VRRP IPv6 multicast group */ |
862f2f37 | 1127 | struct ipv6_mreq mreq; |
dad18a2f QY |
1128 | inet_pton(AF_INET6, VRRP_MCASTV6_GROUP_STR, |
1129 | &mreq.ipv6mr_multiaddr); | |
862f2f37 | 1130 | mreq.ipv6mr_interface = r->vr->ifp->ifindex; |
dad18a2f QY |
1131 | ret = setsockopt(r->sock_rx, IPPROTO_IPV6, IPV6_JOIN_GROUP, |
1132 | &mreq, sizeof(mreq)); | |
b523b241 QY |
1133 | if (ret < 0) { |
1134 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1135 | "Failed to join VRRP %s multicast group", | |
1136 | r->vr->vrid, family2str(r->family)); | |
1137 | failed = true; | |
1138 | goto done; | |
1139 | } | |
b637bcd4 QY |
1140 | DEBUGD(&vrrp_dbg_sock, |
1141 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1142 | "Joined %s VRRP multicast group", | |
1143 | r->vr->vrid, family2str(r->family)); | |
7e205b4a QY |
1144 | |
1145 | /* Set outgoing interface for advertisements */ | |
1146 | ret = setsockopt(r->sock_tx, IPPROTO_IPV6, IPV6_MULTICAST_IF, | |
1147 | &r->mvl_ifp->ifindex, sizeof(ifindex_t)); | |
1148 | if (ret < 0) { | |
1149 | zlog_warn( | |
1150 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1151 | "Could not set %s as outgoing multicast interface", | |
1152 | r->vr->vrid, r->mvl_ifp->name); | |
1153 | failed = true; | |
1154 | goto done; | |
1155 | } | |
b637bcd4 QY |
1156 | DEBUGD(&vrrp_dbg_sock, |
1157 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1158 | "Set %s as outgoing multicast interface", | |
1159 | r->vr->vrid, r->mvl_ifp->name); | |
862f2f37 QY |
1160 | } |
1161 | ||
dad18a2f QY |
1162 | /* Bind Tx socket to link-local address */ |
1163 | if (vrrp_bind_to_primary_connected(r) < 0) { | |
1164 | failed = true; | |
1165 | goto done; | |
5435a2bf | 1166 | } |
dad18a2f | 1167 | |
91188ca6 QY |
1168 | done: |
1169 | ret = 0; | |
1170 | if (failed) { | |
1171 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1172 | "Failed to initialize VRRP %s router", | |
1173 | r->vr->vrid, family2str(r->family)); | |
1b5e2a22 | 1174 | if (r->sock_rx >= 0) { |
dad18a2f | 1175 | close(r->sock_rx); |
1b5e2a22 QY |
1176 | r->sock_rx = -1; |
1177 | } | |
1178 | if (r->sock_tx >= 0) { | |
dad18a2f | 1179 | close(r->sock_tx); |
1b5e2a22 QY |
1180 | r->sock_tx = -1; |
1181 | } | |
91188ca6 QY |
1182 | ret = -1; |
1183 | } | |
1184 | ||
1185 | return ret; | |
5435a2bf QY |
1186 | } |
1187 | ||
1188 | ||
1189 | /* State machine ----------------------------------------------------------- */ | |
1190 | ||
862f2f37 | 1191 | DEFINE_HOOK(vrrp_change_state_hook, (struct vrrp_router * r, int to), (r, to)); |
5435a2bf QY |
1192 | |
1193 | /* | |
1194 | * Handle any necessary actions during state change to MASTER state. | |
1195 | * | |
862f2f37 QY |
1196 | * r |
1197 | * VRRP Router to operate on | |
5435a2bf | 1198 | */ |
862f2f37 | 1199 | static void vrrp_change_state_master(struct vrrp_router *r) |
5435a2bf | 1200 | { |
f3fe0047 QY |
1201 | /* Enable ND Router Advertisements */ |
1202 | if (r->family == AF_INET6) | |
1203 | vrrp_zebra_radv_set(r, true); | |
c3bd894e QY |
1204 | |
1205 | vrrp_zclient_send_interface_protodown(r->mvl_ifp, false); | |
5435a2bf QY |
1206 | } |
1207 | ||
1208 | /* | |
1209 | * Handle any necessary actions during state change to BACKUP state. | |
1210 | * | |
862f2f37 | 1211 | * r |
5435a2bf QY |
1212 | * Virtual Router to operate on |
1213 | */ | |
862f2f37 | 1214 | static void vrrp_change_state_backup(struct vrrp_router *r) |
5435a2bf | 1215 | { |
f3fe0047 QY |
1216 | /* Disable ND Router Advertisements */ |
1217 | if (r->family == AF_INET6) | |
1218 | vrrp_zebra_radv_set(r, false); | |
c3bd894e | 1219 | |
45505f63 QY |
1220 | /* Disable Adver_Timer */ |
1221 | THREAD_OFF(r->t_adver_timer); | |
1222 | ||
c3bd894e | 1223 | vrrp_zclient_send_interface_protodown(r->mvl_ifp, true); |
5435a2bf QY |
1224 | } |
1225 | ||
1226 | /* | |
1227 | * Handle any necessary actions during state change to INITIALIZE state. | |
1228 | * | |
1229 | * This is not called for initial startup, only when transitioning from MASTER | |
1230 | * or BACKUP. | |
1231 | * | |
862f2f37 QY |
1232 | * r |
1233 | * VRRP Router to operate on | |
5435a2bf | 1234 | */ |
862f2f37 | 1235 | static void vrrp_change_state_initialize(struct vrrp_router *r) |
5435a2bf | 1236 | { |
862f2f37 QY |
1237 | r->vr->advertisement_interval = r->vr->advertisement_interval; |
1238 | r->master_adver_interval = 0; | |
1239 | vrrp_recalculate_timers(r); | |
f3fe0047 QY |
1240 | |
1241 | /* Disable ND Router Advertisements */ | |
1242 | if (r->family == AF_INET6) | |
1243 | vrrp_zebra_radv_set(r, false); | |
5435a2bf QY |
1244 | } |
1245 | ||
862f2f37 | 1246 | void (*vrrp_change_state_handlers[])(struct vrrp_router *vr) = { |
5435a2bf QY |
1247 | [VRRP_STATE_MASTER] = vrrp_change_state_master, |
1248 | [VRRP_STATE_BACKUP] = vrrp_change_state_backup, | |
1249 | [VRRP_STATE_INITIALIZE] = vrrp_change_state_initialize, | |
1250 | }; | |
1251 | ||
1252 | /* | |
1253 | * Change Virtual Router FSM position. Handles transitional actions and calls | |
1254 | * any subscribers to the state change hook. | |
1255 | * | |
862f2f37 | 1256 | * r |
5435a2bf QY |
1257 | * Virtual Router for which to change state |
1258 | * | |
1259 | * to | |
1260 | * State to change to | |
1261 | */ | |
862f2f37 | 1262 | static void vrrp_change_state(struct vrrp_router *r, int to) |
5435a2bf | 1263 | { |
6287cefe QY |
1264 | if (r->fsm.state == to) |
1265 | return; | |
1266 | ||
5435a2bf | 1267 | /* Call our handlers, then any subscribers */ |
862f2f37 QY |
1268 | vrrp_change_state_handlers[to](r); |
1269 | hook_call(vrrp_change_state_hook, r, to); | |
1270 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID "%s -> %s", r->vr->vrid, | |
1271 | vrrp_state_names[r->fsm.state], vrrp_state_names[to]); | |
1272 | r->fsm.state = to; | |
5435a2bf QY |
1273 | } |
1274 | ||
1275 | /* | |
1276 | * Called when Adver_Timer expires. | |
1277 | */ | |
1278 | static int vrrp_adver_timer_expire(struct thread *thread) | |
1279 | { | |
862f2f37 | 1280 | struct vrrp_router *r = thread->arg; |
5435a2bf | 1281 | |
b637bcd4 QY |
1282 | DEBUGD(&vrrp_dbg_proto, |
1283 | VRRP_LOGPFX VRRP_LOGPFX_VRID "Adver_Timer expired", r->vr->vrid); | |
4ec94408 | 1284 | |
862f2f37 | 1285 | if (r->fsm.state == VRRP_STATE_MASTER) { |
3e7a4043 | 1286 | /* Send an ADVERTISEMENT */ |
862f2f37 | 1287 | vrrp_send_advertisement(r); |
5435a2bf | 1288 | |
3e7a4043 | 1289 | /* Reset the Adver_Timer to Advertisement_Interval */ |
862f2f37 QY |
1290 | thread_add_timer_msec(master, vrrp_adver_timer_expire, r, |
1291 | r->vr->advertisement_interval * 10, | |
1292 | &r->t_adver_timer); | |
3e7a4043 | 1293 | } else { |
b637bcd4 QY |
1294 | zlog_err(VRRP_LOGPFX VRRP_LOGPFX_VRID |
1295 | "Adver_Timer expired in state '%s'; this is a bug", | |
1296 | r->vr->vrid, vrrp_state_names[r->fsm.state]); | |
5435a2bf | 1297 | } |
3e7a4043 | 1298 | |
5435a2bf QY |
1299 | return 0; |
1300 | } | |
1301 | ||
1302 | /* | |
4ec94408 | 1303 | * Called when Master_Down_Timer expires. |
5435a2bf QY |
1304 | */ |
1305 | static int vrrp_master_down_timer_expire(struct thread *thread) | |
1306 | { | |
862f2f37 | 1307 | struct vrrp_router *r = thread->arg; |
4ec94408 QY |
1308 | |
1309 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID "Master_Down_Timer expired", | |
862f2f37 | 1310 | r->vr->vrid); |
5435a2bf | 1311 | |
c7e3b83d QY |
1312 | vrrp_send_advertisement(r); |
1313 | if (r->family == AF_INET) | |
1314 | vrrp_garp_send_all(r); | |
4f52e9a6 QY |
1315 | if (r->family == AF_INET6) |
1316 | vrrp_ndisc_una_send_all(r); | |
c7e3b83d QY |
1317 | thread_add_timer_msec(master, vrrp_adver_timer_expire, r, |
1318 | r->vr->advertisement_interval * 10, | |
1319 | &r->t_adver_timer); | |
1320 | vrrp_change_state(r, VRRP_STATE_MASTER); | |
1321 | ||
5435a2bf QY |
1322 | return 0; |
1323 | } | |
1324 | ||
1325 | /* | |
1326 | * Event handler for Startup event. | |
1327 | * | |
1328 | * Creates sockets, sends advertisements and ARP requests, starts timers, | |
1d21789e QY |
1329 | * and transitions the Virtual Router to either Master or Backup states. |
1330 | * | |
1331 | * This function will also initialize the program's global ARP subsystem if it | |
1332 | * has not yet been initialized. | |
5435a2bf | 1333 | * |
862f2f37 QY |
1334 | * r |
1335 | * VRRP Router on which to apply Startup event | |
1d21789e QY |
1336 | * |
1337 | * Returns: | |
1338 | * < 0 if the session socket could not be created, or the state is not | |
1339 | * Initialize | |
1340 | * 0 on success | |
5435a2bf | 1341 | */ |
862f2f37 | 1342 | static int vrrp_startup(struct vrrp_router *r) |
5435a2bf | 1343 | { |
1d21789e | 1344 | /* May only be called when the state is Initialize */ |
862f2f37 | 1345 | if (r->fsm.state != VRRP_STATE_INITIALIZE) |
1d21789e QY |
1346 | return -1; |
1347 | ||
7e205b4a | 1348 | /* Must have a valid macvlan interface available */ |
85467974 | 1349 | if (r->mvl_ifp == NULL && !vrrp_attach_interface(r)) { |
7e205b4a QY |
1350 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID |
1351 | "No appropriate interface for %s VRRP found", | |
1352 | r->vr->vrid, family2str(r->family)); | |
1353 | return -1; | |
1354 | } | |
1355 | ||
40744000 | 1356 | /* Initialize global gratuitous ARP socket if necessary */ |
862f2f37 | 1357 | if (r->family == AF_INET && !vrrp_garp_is_init()) |
40744000 | 1358 | vrrp_garp_init(); |
4f52e9a6 QY |
1359 | if (r->family == AF_INET6 && !vrrp_ndisc_is_init()) |
1360 | vrrp_ndisc_init(); | |
40744000 | 1361 | |
5435a2bf | 1362 | /* Create socket */ |
dad18a2f | 1363 | if (r->sock_rx < 0 || r->sock_tx < 0) { |
862f2f37 | 1364 | int ret = vrrp_socket(r); |
dad18a2f | 1365 | if (ret < 0 || r->sock_tx < 0 || r->sock_rx < 0) |
862f2f37 QY |
1366 | return ret; |
1367 | } | |
5435a2bf QY |
1368 | |
1369 | /* Schedule listener */ | |
dad18a2f | 1370 | thread_add_read(master, vrrp_read, r, r->sock_rx, &r->t_read); |
5435a2bf | 1371 | |
91188ca6 | 1372 | /* Configure effective priority */ |
862f2f37 QY |
1373 | struct ipaddr *primary = (struct ipaddr *)listhead(r->addrs)->data; |
1374 | ||
1375 | char ipbuf[INET6_ADDRSTRLEN]; | |
1376 | inet_ntop(r->family, &primary->ip.addr, ipbuf, sizeof(ipbuf)); | |
1377 | ||
7e205b4a | 1378 | if (vrrp_is_owner(r->vr->ifp, primary)) { |
862f2f37 QY |
1379 | r->priority = VRRP_PRIO_MASTER; |
1380 | vrrp_recalculate_timers(r); | |
1381 | ||
5d3730c5 QY |
1382 | zlog_info( |
1383 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1384 | "%s owns primary Virtual Router IP %s; electing self as Master", | |
862f2f37 | 1385 | r->vr->vrid, r->vr->ifp->name, ipbuf); |
5d3730c5 QY |
1386 | } |
1387 | ||
862f2f37 QY |
1388 | if (r->priority == VRRP_PRIO_MASTER) { |
1389 | vrrp_send_advertisement(r); | |
5435a2bf | 1390 | |
862f2f37 QY |
1391 | if (r->family == AF_INET) |
1392 | vrrp_garp_send_all(r); | |
4f52e9a6 QY |
1393 | if (r->family == AF_INET6) |
1394 | vrrp_ndisc_una_send_all(r); | |
862f2f37 QY |
1395 | |
1396 | thread_add_timer_msec(master, vrrp_adver_timer_expire, r, | |
1397 | r->vr->advertisement_interval * 10, | |
1398 | &r->t_adver_timer); | |
1399 | vrrp_change_state(r, VRRP_STATE_MASTER); | |
5435a2bf | 1400 | } else { |
862f2f37 QY |
1401 | r->master_adver_interval = r->vr->advertisement_interval; |
1402 | vrrp_recalculate_timers(r); | |
1403 | thread_add_timer_msec(master, vrrp_master_down_timer_expire, r, | |
1404 | r->master_down_interval * 10, | |
1405 | &r->t_master_down_timer); | |
1406 | vrrp_change_state(r, VRRP_STATE_BACKUP); | |
5435a2bf | 1407 | } |
a8144d7f | 1408 | |
862f2f37 QY |
1409 | r->is_active = true; |
1410 | ||
a8144d7f | 1411 | return 0; |
5435a2bf QY |
1412 | } |
1413 | ||
1d21789e QY |
1414 | /* |
1415 | * Shuts down a Virtual Router and transitions it to Initialize. | |
1416 | * | |
1417 | * This call must be idempotent; it is safe to call multiple times on the same | |
862f2f37 | 1418 | * VRRP Router. |
1d21789e | 1419 | */ |
862f2f37 | 1420 | static int vrrp_shutdown(struct vrrp_router *r) |
5435a2bf | 1421 | { |
45505f63 QY |
1422 | uint8_t saved_prio; |
1423 | ||
862f2f37 QY |
1424 | switch (r->fsm.state) { |
1425 | case VRRP_STATE_MASTER: | |
862f2f37 | 1426 | /* Send an ADVERTISEMENT with Priority = 0 */ |
45505f63 | 1427 | saved_prio = r->priority; |
862f2f37 QY |
1428 | r->priority = 0; |
1429 | vrrp_send_advertisement(r); | |
1430 | r->priority = saved_prio; | |
1431 | break; | |
1432 | case VRRP_STATE_BACKUP: | |
862f2f37 QY |
1433 | break; |
1434 | case VRRP_STATE_INITIALIZE: | |
b637bcd4 QY |
1435 | DEBUGD(&vrrp_dbg_proto, |
1436 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1437 | "Received '%s' event in '%s' state; ignoring", | |
1438 | r->vr->vrid, vrrp_event_names[VRRP_EVENT_SHUTDOWN], | |
1439 | vrrp_state_names[VRRP_STATE_INITIALIZE]); | |
862f2f37 | 1440 | break; |
3e7a4043 QY |
1441 | } |
1442 | ||
45505f63 QY |
1443 | /* Cancel all timers */ |
1444 | THREAD_OFF(r->t_adver_timer); | |
1445 | THREAD_OFF(r->t_master_down_timer); | |
1446 | ||
b7dc1bbb QY |
1447 | if (r->sock_rx > 0) { |
1448 | close(r->sock_rx); | |
1449 | r->sock_rx = -1; | |
1450 | } | |
1451 | if (r->sock_tx > 0) { | |
1452 | close(r->sock_tx); | |
1453 | r->sock_tx = -1; | |
1454 | } | |
1455 | ||
862f2f37 | 1456 | vrrp_change_state(r, VRRP_STATE_INITIALIZE); |
1d21789e | 1457 | |
73b5cb19 QY |
1458 | r->is_active = false; |
1459 | ||
a8144d7f | 1460 | return 0; |
5435a2bf QY |
1461 | } |
1462 | ||
862f2f37 | 1463 | static int (*vrrp_event_handlers[])(struct vrrp_router *r) = { |
5435a2bf QY |
1464 | [VRRP_EVENT_STARTUP] = vrrp_startup, |
1465 | [VRRP_EVENT_SHUTDOWN] = vrrp_shutdown, | |
1466 | }; | |
1467 | ||
1468 | /* | |
862f2f37 | 1469 | * Spawn a VRRP FSM event on a VRRP Router. |
5435a2bf QY |
1470 | * |
1471 | * vr | |
862f2f37 | 1472 | * VRRP Router on which to spawn event |
5435a2bf QY |
1473 | * |
1474 | * event | |
1475 | * The event to spawn | |
27fd8827 QY |
1476 | * |
1477 | * Returns: | |
1478 | * -1 on failure | |
1479 | * 0 otherwise | |
5435a2bf | 1480 | */ |
862f2f37 | 1481 | int vrrp_event(struct vrrp_router *r, int event) |
5435a2bf | 1482 | { |
862f2f37 | 1483 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID "'%s' event", r->vr->vrid, |
dfed4e22 | 1484 | vrrp_event_names[event]); |
862f2f37 | 1485 | return vrrp_event_handlers[event](r); |
5435a2bf QY |
1486 | } |
1487 | ||
1488 | ||
27fd8827 QY |
1489 | /* Autoconfig -------------------------------------------------------------- */ |
1490 | ||
1491 | /* | |
1492 | * Set the configured addresses for this VRRP instance to exactly the addresses | |
1493 | * present on its macvlan subinterface(s). | |
1494 | * | |
1495 | * vr | |
1496 | * VRRP router to act on | |
1497 | */ | |
1498 | static void vrrp_autoconfig_autoaddrupdate(struct vrrp_vrouter *vr) | |
1499 | { | |
1500 | list_delete_all_node(vr->v4->addrs); | |
1501 | list_delete_all_node(vr->v6->addrs); | |
1502 | ||
1503 | struct listnode *ln; | |
1504 | struct connected *c = NULL; | |
00984df7 | 1505 | char ipbuf[INET6_ADDRSTRLEN]; |
27fd8827 | 1506 | |
b637bcd4 QY |
1507 | if (vr->v4->mvl_ifp) { |
1508 | DEBUGD(&vrrp_dbg_auto, | |
1509 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1510 | "Setting IPv4 Virtual IP list to match IPv4 addresses on %s", | |
1511 | vr->vrid, vr->v4->mvl_ifp->name); | |
27fd8827 | 1512 | for (ALL_LIST_ELEMENTS_RO(vr->v4->mvl_ifp->connected, ln, c)) |
00984df7 QY |
1513 | if (c->address->family == AF_INET) { |
1514 | inet_ntop(AF_INET, &c->address->u.prefix4, ipbuf, | |
1515 | sizeof(ipbuf)); | |
1516 | DEBUGD(&vrrp_dbg_auto, | |
1517 | VRRP_LOGPFX VRRP_LOGPFX_VRID "Adding %s", | |
1518 | vr->vrid, ipbuf); | |
6e93585e | 1519 | vrrp_add_ipv4(vr, c->address->u.prefix4); |
00984df7 | 1520 | } |
b637bcd4 | 1521 | } |
27fd8827 | 1522 | |
b637bcd4 QY |
1523 | if (vr->v6->mvl_ifp) { |
1524 | DEBUGD(&vrrp_dbg_auto, | |
1525 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1526 | "Setting IPv6 Virtual IP list to match IPv6 addresses on %s", | |
1527 | vr->vrid, vr->v6->mvl_ifp->name); | |
27fd8827 QY |
1528 | for (ALL_LIST_ELEMENTS_RO(vr->v6->mvl_ifp->connected, ln, c)) |
1529 | if (c->address->family == AF_INET6 | |
00984df7 QY |
1530 | && !IN6_IS_ADDR_LINKLOCAL(&c->address->u.prefix6)) { |
1531 | inet_ntop(AF_INET6, &c->address->u.prefix6, | |
1532 | ipbuf, sizeof(ipbuf)); | |
1533 | DEBUGD(&vrrp_dbg_auto, | |
1534 | VRRP_LOGPFX VRRP_LOGPFX_VRID "Adding %s", | |
1535 | vr->vrid, ipbuf); | |
6e93585e | 1536 | vrrp_add_ipv6(vr, c->address->u.prefix6); |
00984df7 | 1537 | } |
b637bcd4 | 1538 | } |
27fd8827 | 1539 | |
6e93585e QY |
1540 | vrrp_check_start(vr); |
1541 | ||
27fd8827 | 1542 | if (vr->v4->addrs->count == 0 |
b637bcd4 QY |
1543 | && vr->v4->fsm.state != VRRP_STATE_INITIALIZE) { |
1544 | DEBUGD(&vrrp_dbg_auto, | |
1545 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1546 | "IPv4 Virtual IP list is empty; shutting down", | |
1547 | vr->vrid); | |
27fd8827 | 1548 | vrrp_event(vr->v4, VRRP_EVENT_SHUTDOWN); |
b637bcd4 | 1549 | } |
27fd8827 | 1550 | if (vr->v6->addrs->count == 0 |
b637bcd4 QY |
1551 | && vr->v6->fsm.state != VRRP_STATE_INITIALIZE) { |
1552 | DEBUGD(&vrrp_dbg_auto, | |
1553 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1554 | "IPv6 Virtual IP list is empty; shutting down", | |
1555 | vr->vrid); | |
9e006c64 | 1556 | vrrp_event(vr->v6, VRRP_EVENT_SHUTDOWN); |
b637bcd4 | 1557 | } |
27fd8827 | 1558 | } |
5435a2bf | 1559 | |
53e60e5c QY |
1560 | static struct vrrp_vrouter * |
1561 | vrrp_autoconfig_autocreate(struct interface *mvl_ifp) | |
1562 | { | |
1563 | struct interface *p; | |
1564 | struct vrrp_vrouter *vr; | |
1565 | ||
1566 | p = if_lookup_by_index(mvl_ifp->link_ifindex, VRF_DEFAULT); | |
27fd8827 QY |
1567 | |
1568 | if (!p) | |
1569 | return NULL; | |
1570 | ||
53e60e5c QY |
1571 | uint8_t vrid = mvl_ifp->hw_addr[5]; |
1572 | ||
00984df7 QY |
1573 | DEBUGD(&vrrp_dbg_auto, |
1574 | VRRP_LOGPFX VRRP_LOGPFX_VRID "Autoconfiguring VRRP on %s", vrid, | |
b637bcd4 | 1575 | p->name); |
53e60e5c | 1576 | |
53e60e5c QY |
1577 | vr = vrrp_vrouter_create(p, vrid, vrrp_autoconfig_version); |
1578 | ||
27fd8827 QY |
1579 | if (!vr) { |
1580 | zlog_warn(VRRP_LOGPFX | |
1581 | "Failed to autoconfigure VRRP instance %" PRIu8 | |
1582 | " on %s", | |
1583 | vrid, p->name); | |
53e60e5c | 1584 | return NULL; |
27fd8827 | 1585 | } |
53e60e5c | 1586 | |
27fd8827 | 1587 | vrrp_autoconfig_autoaddrupdate(vr); |
53e60e5c QY |
1588 | |
1589 | vr->autoconf = true; | |
1590 | ||
1591 | return vr; | |
1592 | } | |
1593 | ||
6e93585e QY |
1594 | /* |
1595 | * Callback to notify autoconfig of interface add. | |
1596 | * | |
1597 | * If the interface is a VRRP-compatible device, and there is no existing VRRP | |
1598 | * router running on it, one is created. All addresses on the interface are | |
1599 | * added to the router. | |
1600 | * | |
1601 | * ifp | |
1602 | * Interface to operate on | |
1603 | * | |
1604 | * Returns: | |
1605 | * -1 on failure | |
1606 | * 0 otherwise | |
1607 | */ | |
1608 | static int vrrp_autoconfig_if_add(struct interface *ifp) | |
27fd8827 | 1609 | { |
2198a5bb QY |
1610 | bool created = false; |
1611 | struct vrrp_vrouter *vr; | |
1612 | ||
27fd8827 QY |
1613 | if (!vrrp_autoconfig_is_on) |
1614 | return 0; | |
1615 | ||
27fd8827 QY |
1616 | if (!ifp || !ifp->link_ifindex || !vrrp_ifp_has_vrrp_mac(ifp)) |
1617 | return -1; | |
1618 | ||
6e93585e | 1619 | vr = vrrp_lookup_by_if_mvl(ifp); |
27fd8827 | 1620 | |
2198a5bb | 1621 | if (!vr) { |
27fd8827 | 1622 | vr = vrrp_autoconfig_autocreate(ifp); |
2198a5bb QY |
1623 | created = true; |
1624 | } | |
27fd8827 QY |
1625 | |
1626 | if (!vr) | |
1627 | return -1; | |
1628 | ||
1629 | if (vr->autoconf == false) | |
1630 | return 0; | |
2198a5bb | 1631 | else if (!created) { |
27fd8827 QY |
1632 | vrrp_autoconfig_autoaddrupdate(vr); |
1633 | } | |
1634 | ||
1635 | return 0; | |
1636 | } | |
1637 | ||
6e93585e QY |
1638 | /* |
1639 | * Callback to notify autoconfig of interface delete. | |
1640 | * | |
1641 | * If the interface is a VRRP-compatible device, and a VRRP router is running | |
1642 | * on it, and that VRRP router was automatically configured, it will be | |
1643 | * deleted. If that was the last router for the corresponding VRID (i.e., if | |
1644 | * this interface was a v4 VRRP interface and no v6 router is configured for | |
1645 | * the same VRID) then the entire virtual router is deleted. | |
1646 | * | |
1647 | * ifp | |
1648 | * Interface to operate on | |
1649 | * | |
1650 | * Returns: | |
1651 | * -1 on failure | |
1652 | * 0 otherwise | |
1653 | */ | |
1654 | static int vrrp_autoconfig_if_del(struct interface *ifp) | |
27fd8827 QY |
1655 | { |
1656 | if (!vrrp_autoconfig_is_on) | |
1657 | return 0; | |
1658 | ||
6e93585e QY |
1659 | struct vrrp_vrouter *vr; |
1660 | struct listnode *ln; | |
1661 | struct list *vrs; | |
27fd8827 | 1662 | |
6e93585e | 1663 | vrs = vrrp_lookup_by_if_any(ifp); |
27fd8827 | 1664 | |
6e93585e QY |
1665 | for (ALL_LIST_ELEMENTS_RO(vrs, ln, vr)) |
1666 | if (vr->autoconf | |
1667 | && (!vr->ifp || (!vr->v4->mvl_ifp && !vr->v6->mvl_ifp))) { | |
b637bcd4 QY |
1668 | DEBUGD(&vrrp_dbg_auto, |
1669 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
6e93585e QY |
1670 | "All VRRP interfaces for instance deleted; destroying autoconfigured VRRP router", |
1671 | vr->vrid); | |
1672 | vrrp_vrouter_destroy(vr); | |
b637bcd4 | 1673 | } |
27fd8827 | 1674 | |
6e93585e | 1675 | list_delete(&vrs); |
27fd8827 QY |
1676 | |
1677 | return 0; | |
1678 | } | |
1679 | ||
6e93585e QY |
1680 | /* |
1681 | * Callback to notify autoconfig of interface up. | |
1682 | * | |
8bceffc7 QY |
1683 | * Creates VRRP instance on interface if it does not exist. Otherwise does |
1684 | * nothing. | |
6e93585e QY |
1685 | * |
1686 | * ifp | |
1687 | * Interface to operate on | |
1688 | * | |
1689 | * Returns: | |
1690 | * -1 on failure | |
1691 | * 0 otherwise | |
1692 | */ | |
1693 | static int vrrp_autoconfig_if_up(struct interface *ifp) | |
53e60e5c | 1694 | { |
27fd8827 QY |
1695 | if (!vrrp_autoconfig_is_on) |
1696 | return 0; | |
1697 | ||
6e93585e | 1698 | struct vrrp_vrouter *vr = vrrp_lookup_by_if_mvl(ifp); |
27fd8827 QY |
1699 | |
1700 | if (vr && !vr->autoconf) | |
1701 | return 0; | |
1702 | ||
1703 | if (!vr) { | |
1704 | vrrp_autoconfig_if_add(ifp); | |
53e60e5c QY |
1705 | return 0; |
1706 | } | |
1707 | ||
27fd8827 QY |
1708 | return 0; |
1709 | } | |
1710 | ||
6e93585e QY |
1711 | /* |
1712 | * Callback to notify autoconfig of interface down. | |
1713 | * | |
1714 | * Does nothing. An interface down event is accompanied by address deletion | |
1715 | * events for all the addresses on the interface; if an autoconfigured VRRP | |
1716 | * router exists on this interface, then it will have all its addresses deleted | |
1717 | * and end up in Initialize. | |
1718 | * | |
1719 | * ifp | |
1720 | * Interface to operate on | |
1721 | * | |
1722 | * Returns: | |
1723 | * -1 on failure | |
1724 | * 0 otherwise | |
1725 | */ | |
1726 | static int vrrp_autoconfig_if_down(struct interface *ifp) | |
27fd8827 QY |
1727 | { |
1728 | if (!vrrp_autoconfig_is_on) | |
1729 | return 0; | |
1730 | ||
1731 | return 0; | |
1732 | } | |
1733 | ||
6e93585e QY |
1734 | /* |
1735 | * Callback to notify autoconfig of a new interface address. | |
1736 | * | |
1737 | * If a VRRP router exists on this interface, its address list is updated to | |
1738 | * match the new address list. If no addresses remain, a Shutdown event is | |
1739 | * issued to the VRRP router. | |
1740 | * | |
1741 | * ifp | |
1742 | * Interface to operate on | |
1743 | * | |
1744 | * Returns: | |
1745 | * -1 on failure | |
1746 | * 0 otherwise | |
1747 | * | |
1748 | */ | |
1749 | static int vrrp_autoconfig_if_address_add(struct interface *ifp) | |
27fd8827 QY |
1750 | { |
1751 | if (!vrrp_autoconfig_is_on) | |
1752 | return 0; | |
1753 | ||
6e93585e | 1754 | struct vrrp_vrouter *vr = vrrp_lookup_by_if_mvl(ifp); |
27fd8827 QY |
1755 | |
1756 | if (vr && vr->autoconf) | |
1757 | vrrp_autoconfig_autoaddrupdate(vr); | |
1758 | ||
1759 | return 0; | |
1760 | } | |
1761 | ||
6e93585e QY |
1762 | /* |
1763 | * Callback to notify autoconfig of a removed interface address. | |
1764 | * | |
1765 | * If a VRRP router exists on this interface, its address list is updated to | |
1766 | * match the new address list. If no addresses remain, a Shutdown event is | |
1767 | * issued to the VRRP router. | |
1768 | * | |
1769 | * ifp | |
1770 | * Interface to operate on | |
1771 | * | |
1772 | * Returns: | |
1773 | * -1 on failure | |
1774 | * 0 otherwise | |
1775 | * | |
1776 | */ | |
1777 | static int vrrp_autoconfig_if_address_del(struct interface *ifp) | |
27fd8827 QY |
1778 | { |
1779 | if (!vrrp_autoconfig_is_on) | |
1780 | return 0; | |
1781 | ||
6e93585e | 1782 | struct vrrp_vrouter *vr = vrrp_lookup_by_if_mvl(ifp); |
27fd8827 QY |
1783 | |
1784 | if (vr && vr->autoconf) | |
1785 | vrrp_autoconfig_autoaddrupdate(vr); | |
1786 | ||
1787 | return 0; | |
1788 | } | |
1789 | ||
1790 | int vrrp_autoconfig(void) | |
1791 | { | |
1792 | if (!vrrp_autoconfig_is_on) | |
1793 | return 0; | |
1794 | ||
53e60e5c | 1795 | struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT); |
27fd8827 | 1796 | struct interface *ifp; |
53e60e5c QY |
1797 | |
1798 | FOR_ALL_INTERFACES (vrf, ifp) | |
27fd8827 | 1799 | vrrp_autoconfig_if_add(ifp); |
53e60e5c QY |
1800 | |
1801 | return 0; | |
1802 | } | |
1803 | ||
27fd8827 QY |
1804 | void vrrp_autoconfig_on(int version) |
1805 | { | |
1806 | vrrp_autoconfig_is_on = true; | |
1807 | vrrp_autoconfig_version = version; | |
1808 | ||
1809 | vrrp_autoconfig(); | |
1810 | } | |
1811 | ||
1812 | void vrrp_autoconfig_off(void) | |
1813 | { | |
1814 | vrrp_autoconfig_is_on = false; | |
1815 | ||
1816 | struct list *ll = hash_to_list(vrrp_vrouters_hash); | |
1817 | ||
1818 | struct listnode *ln; | |
1819 | struct vrrp_vrouter *vr; | |
1820 | ||
1821 | for (ALL_LIST_ELEMENTS_RO(ll, ln, vr)) | |
1822 | if (vr->autoconf) | |
1823 | vrrp_vrouter_destroy(vr); | |
1824 | ||
1825 | list_delete(&ll); | |
1826 | } | |
1827 | ||
6e93585e QY |
1828 | /* Interface tracking ------------------------------------------------------ */ |
1829 | ||
1830 | /* | |
1831 | * Bind any pending interfaces. | |
1832 | * | |
1833 | * mvl_ifp | |
1834 | * macvlan interface that some VRRP instances might want to bind to | |
1835 | */ | |
1836 | static void vrrp_bind_pending(struct interface *mvl_ifp) | |
1837 | { | |
1838 | struct vrrp_vrouter *vr; | |
1839 | ||
1840 | vr = vrrp_lookup_by_if_mvl(mvl_ifp); | |
1841 | ||
1842 | if (vr) { | |
1843 | if (mvl_ifp->hw_addr[4] == 0x01 && !vr->v4->mvl_ifp) | |
1844 | vrrp_attach_interface(vr->v4); | |
1845 | else if (mvl_ifp->hw_addr[4] == 0x02 && !vr->v6->mvl_ifp) | |
1846 | vrrp_attach_interface(vr->v6); | |
1847 | } | |
1848 | } | |
1849 | ||
1850 | void vrrp_if_up(struct interface *ifp) | |
1851 | { | |
1852 | struct vrrp_vrouter *vr; | |
1853 | struct listnode *ln; | |
1854 | struct list *vrs; | |
1855 | ||
1856 | vrrp_bind_pending(ifp); | |
1857 | ||
1858 | vrs = vrrp_lookup_by_if_any(ifp); | |
1859 | ||
1860 | for (ALL_LIST_ELEMENTS_RO(vrs, ln, vr)) | |
1861 | vrrp_check_start(vr); | |
1862 | ||
1863 | list_delete(&vrs); | |
1864 | ||
1865 | vrrp_autoconfig_if_up(ifp); | |
1866 | } | |
1867 | ||
1868 | void vrrp_if_down(struct interface *ifp) | |
1869 | { | |
1870 | struct vrrp_vrouter *vr; | |
1871 | struct listnode *ln; | |
1872 | struct list *vrs; | |
1873 | ||
1874 | vrs = vrrp_lookup_by_if_any(ifp); | |
1875 | ||
1876 | for (ALL_LIST_ELEMENTS_RO(vrs, ln, vr)) { | |
1877 | if (vr->v4->mvl_ifp == ifp || vr->ifp == ifp) { | |
45505f63 | 1878 | if (vr->v4->fsm.state == VRRP_STATE_MASTER) { |
6e93585e QY |
1879 | DEBUGD(&vrrp_dbg_auto, |
1880 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
45505f63 | 1881 | "Interface %s down; transitioning IPv4 VRRP router to Backup", |
6e93585e | 1882 | vr->vrid, ifp->name); |
45505f63 | 1883 | vrrp_change_state(vr->v4, VRRP_STATE_BACKUP); |
6e93585e QY |
1884 | } |
1885 | } | |
1886 | ||
1887 | if (vr->v6->mvl_ifp == ifp || vr->ifp == ifp) { | |
45505f63 | 1888 | if (vr->v6->fsm.state == VRRP_STATE_MASTER) { |
6e93585e QY |
1889 | DEBUGD(&vrrp_dbg_auto, |
1890 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
45505f63 | 1891 | "Interface %s down; transitioning IPv6 VRRP router to Backup", |
6e93585e | 1892 | vr->vrid, ifp->name); |
45505f63 | 1893 | vrrp_change_state(vr->v6, VRRP_STATE_BACKUP); |
6e93585e QY |
1894 | } |
1895 | } | |
1896 | } | |
1897 | ||
1898 | list_delete(&vrs); | |
1899 | ||
1900 | vrrp_autoconfig_if_down(ifp); | |
1901 | } | |
1902 | ||
1903 | void vrrp_if_add(struct interface *ifp) | |
1904 | { | |
1905 | vrrp_bind_pending(ifp); | |
1906 | ||
1907 | /* thanks, zebra */ | |
1908 | if (CHECK_FLAG(ifp->flags, IFF_UP)) | |
1909 | vrrp_if_up(ifp); | |
1910 | ||
1911 | vrrp_autoconfig_if_add(ifp); | |
1912 | } | |
1913 | ||
1914 | void vrrp_if_del(struct interface *ifp) | |
1915 | { | |
1916 | struct listnode *ln; | |
1917 | struct vrrp_vrouter *vr; | |
1918 | struct list *vrs = vrrp_lookup_by_if_any(ifp); | |
1919 | ||
1920 | vrrp_if_down(ifp); | |
1921 | ||
1922 | for (ALL_LIST_ELEMENTS_RO(vrs, ln, vr)) { | |
1923 | if (vr->ifp == ifp) | |
1924 | vr->ifp = NULL; | |
1925 | else if (vr->v4->mvl_ifp == ifp) | |
1926 | vr->v4->mvl_ifp = NULL; | |
1927 | else if (vr->v6->mvl_ifp == ifp) | |
1928 | vr->v6->mvl_ifp = NULL; | |
1929 | } | |
1930 | ||
1931 | list_delete(&vrs); | |
1932 | ||
1933 | vrrp_autoconfig_if_del(ifp); | |
1934 | } | |
1935 | ||
1936 | void vrrp_if_address_add(struct interface *ifp) | |
1937 | { | |
1938 | struct vrrp_vrouter *vr; | |
1939 | struct listnode *ln; | |
1940 | struct list *vrs; | |
1941 | ||
1942 | /* | |
1943 | * We have to do a wide search here, because we need to know when a v6 | |
1944 | * macvlan device gets a new address. This is because the macvlan link | |
1945 | * local is used as the source address for v6 advertisements, and hence | |
1946 | * "do I have a link local" constitutes an activation condition for v6 | |
1947 | * virtual routers. | |
1948 | */ | |
1949 | vrs = vrrp_lookup_by_if_any(ifp); | |
1950 | ||
1951 | for (ALL_LIST_ELEMENTS_RO(vrs, ln, vr)) | |
1952 | vrrp_check_start(vr); | |
1953 | ||
1954 | list_delete(&vrs); | |
1955 | ||
1956 | vrrp_autoconfig_if_address_add(ifp); | |
1957 | } | |
1958 | ||
1959 | void vrrp_if_address_del(struct interface *ifp) | |
1960 | { | |
89f34204 QY |
1961 | /* |
1962 | * Zebra is stupid and sends us address deletion notifications | |
1963 | * when any of the following condition sets are met: | |
1964 | * | |
b0ec34c8 QY |
1965 | * - if_is_operative && address deleted |
1966 | * - if_is_operative -> !if_is_operative | |
89f34204 QY |
1967 | * |
1968 | * Note that the second one is nonsense, because Zebra behaves as | |
1969 | * though an interface going down means all the addresses on that | |
1970 | * interface got deleted. Which is a problem for autoconfig because all | |
1971 | * the addresses on an interface going away means the VRRP session goes | |
1972 | * to Initialize. However interfaces go down whenever we transition to | |
1973 | * Backup, so this effectively means that for autoconfigured instances | |
1974 | * we actually end up in Initialize whenever we try to go into Backup. | |
1975 | * | |
1976 | * Also, Zebra does NOT send us notifications when: | |
b0ec34c8 | 1977 | * - !if_is_operative && address deleted |
89f34204 QY |
1978 | * |
1979 | * Which means if we're in backup and an address is deleted out from | |
1980 | * under us, we won't even know. | |
1981 | * | |
1982 | * The only solution here is to only resynchronize our address list | |
1983 | * when: | |
1984 | * | |
1985 | * - An interfaces comes up | |
1986 | * - An interface address is added | |
1987 | * - An interface address is deleted AND the interface is up | |
1988 | * | |
1989 | * Even though this is only a problem with autoconfig at the moment I'm | |
1990 | * papering over Zebra's braindead semantics here. Every piece of code | |
1991 | * in this function should be protected by a check that the interface | |
1992 | * is up. | |
1993 | */ | |
b0ec34c8 | 1994 | if (if_is_operative(ifp)) { |
89f34204 QY |
1995 | vrrp_autoconfig_if_address_del(ifp); |
1996 | } | |
6e93585e QY |
1997 | } |
1998 | ||
27fd8827 QY |
1999 | /* Other ------------------------------------------------------------------- */ |
2000 | ||
f828842a QY |
2001 | int vrrp_config_write_interface(struct vty *vty) |
2002 | { | |
2003 | struct list *vrs = hash_to_list(vrrp_vrouters_hash); | |
2004 | struct listnode *ln; | |
2005 | struct vrrp_vrouter *vr; | |
2006 | int writes = 0; | |
2007 | ||
2008 | for (ALL_LIST_ELEMENTS_RO(vrs, ln, vr)) { | |
2009 | vty_frame(vty, "interface %s\n", vr->ifp->name); | |
2010 | ++writes; | |
2011 | ||
2012 | vty_out(vty, " vrrp %" PRIu8 "%s\n", vr->vrid, | |
2013 | vr->version == 2 ? " version 2" : ""); | |
2014 | ++writes; | |
2015 | ||
2016 | if (!vr->preempt_mode && ++writes) | |
2017 | vty_out(vty, " no vrrp %" PRIu8 " preempt\n", vr->vrid); | |
2018 | ||
2019 | if (vr->accept_mode && ++writes) | |
2020 | vty_out(vty, " vrrp %" PRIu8 " accept\n", vr->vrid); | |
2021 | ||
2022 | if (vr->advertisement_interval != VRRP_DEFAULT_ADVINT | |
2023 | && ++writes) | |
2024 | vty_out(vty, | |
2025 | " vrrp %" PRIu8 | |
2026 | " advertisement-interval %" PRIu16 "\n", | |
2027 | vr->vrid, vr->advertisement_interval); | |
2028 | ||
2029 | if (vr->priority != VRRP_DEFAULT_PRIORITY && ++writes) | |
2030 | vty_out(vty, " vrrp %" PRIu8 " priority %" PRIu8 "\n", | |
2031 | vr->vrid, vr->priority); | |
2032 | ||
2033 | ln = NULL; | |
2034 | struct ipaddr *ip; | |
2035 | ||
2036 | for (ALL_LIST_ELEMENTS_RO(vr->v4->addrs, ln, ip)) { | |
2037 | char ipbuf[INET6_ADDRSTRLEN]; | |
2038 | ipaddr2str(ip, ipbuf, sizeof(ipbuf)); | |
2039 | vty_out(vty, " vrrp %" PRIu8 " ip %s\n", vr->vrid, | |
2040 | ipbuf); | |
2041 | ++writes; | |
2042 | } | |
2043 | for (ALL_LIST_ELEMENTS_RO(vr->v6->addrs, ln, ip)) { | |
2044 | char ipbuf[INET6_ADDRSTRLEN]; | |
2045 | ipaddr2str(ip, ipbuf, sizeof(ipbuf)); | |
2046 | vty_out(vty, " vrrp %" PRIu8 " ipv6 %s\n", vr->vrid, | |
2047 | ipbuf); | |
2048 | ++writes; | |
2049 | } | |
2050 | } | |
2051 | ||
2052 | return writes; | |
2053 | } | |
2054 | ||
2055 | int vrrp_config_write_global(struct vty *vty) | |
2056 | { | |
2057 | if (vrrp_autoconfig_is_on) | |
2058 | vty_out(vty, "vrrp autoconfigure%s\n", | |
2059 | vrrp_autoconfig_version == 2 ? " version 2" : ""); | |
2060 | ||
2061 | return 1; | |
2062 | } | |
2063 | ||
5435a2bf QY |
2064 | static unsigned int vrrp_hash_key(void *arg) |
2065 | { | |
2066 | struct vrrp_vrouter *vr = arg; | |
2067 | ||
4f0b6b45 | 2068 | char key[IFNAMSIZ + 64]; |
fc278f75 | 2069 | snprintf(key, sizeof(key), "%s@%" PRIu8, vr->ifp->name, vr->vrid); |
4f0b6b45 QY |
2070 | |
2071 | return string_hash_make(key); | |
5435a2bf QY |
2072 | } |
2073 | ||
2074 | static bool vrrp_hash_cmp(const void *arg1, const void *arg2) | |
2075 | { | |
2076 | const struct vrrp_vrouter *vr1 = arg1; | |
2077 | const struct vrrp_vrouter *vr2 = arg2; | |
2078 | ||
4f0b6b45 QY |
2079 | if (vr1->ifp != vr2->ifp) |
2080 | return 0; | |
2081 | if (vr1->vrid != vr2->vrid) | |
2082 | return 0; | |
2083 | ||
2084 | return 1; | |
5435a2bf QY |
2085 | } |
2086 | ||
2087 | void vrrp_init(void) | |
2088 | { | |
53e60e5c | 2089 | vrrp_autoconfig_version = 3; |
5435a2bf QY |
2090 | vrrp_vrouters_hash = hash_create(&vrrp_hash_key, vrrp_hash_cmp, |
2091 | "VRRP virtual router hash"); | |
2092 | vrf_init(NULL, NULL, NULL, NULL, NULL); | |
2093 | } |