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1 | /* | |
2 | * VRRP global definitions and state machine. | |
3 | * Copyright (C) 2018-2019 Cumulus Networks, Inc. | |
4 | * Quentin Young | |
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 | */ | |
20 | #include <zebra.h> | |
21 | ||
22 | #include "lib/hash.h" | |
23 | #include "lib/hook.h" | |
24 | #include "lib/if.h" | |
25 | #include "lib/linklist.h" | |
26 | #include "lib/memory.h" | |
27 | #include "lib/network.h" | |
28 | #include "lib/prefix.h" | |
29 | #include "lib/sockopt.h" | |
30 | #include "lib/sockunion.h" | |
31 | #include "lib/vrf.h" | |
32 | #include "lib/vty.h" | |
33 | ||
34 | #include "vrrp.h" | |
35 | #include "vrrp_arp.h" | |
36 | #include "vrrp_debug.h" | |
37 | #include "vrrp_ndisc.h" | |
38 | #include "vrrp_packet.h" | |
39 | #include "vrrp_zebra.h" | |
40 | ||
41 | #define VRRP_LOGPFX "[CORE] " | |
42 | ||
43 | DEFINE_MTYPE_STATIC(VRRPD, VRRP_IP, "VRRP IP address") | |
44 | DEFINE_MTYPE_STATIC(VRRPD, VRRP_RTR, "VRRP Router") | |
45 | ||
46 | /* statics */ | |
47 | struct hash *vrrp_vrouters_hash; | |
48 | bool vrrp_autoconfig_is_on; | |
49 | int vrrp_autoconfig_version; | |
50 | ||
51 | struct vrrp_defaults vd; | |
52 | ||
53 | const char *vrrp_state_names[3] = { | |
54 | [VRRP_STATE_INITIALIZE] = "Initialize", | |
55 | [VRRP_STATE_MASTER] = "Master", | |
56 | [VRRP_STATE_BACKUP] = "Backup", | |
57 | }; | |
58 | ||
59 | const char *vrrp_event_names[2] = { | |
60 | [VRRP_EVENT_STARTUP] = "Startup", | |
61 | [VRRP_EVENT_SHUTDOWN] = "Shutdown", | |
62 | }; | |
63 | ||
64 | ||
65 | /* Utility functions ------------------------------------------------------- */ | |
66 | ||
67 | /* | |
68 | * Sets an ethaddr to RFC-defined Virtual Router MAC address. | |
69 | * | |
70 | * mac | |
71 | * ethaddr to set | |
72 | * | |
73 | * v6 | |
74 | * Whether this is a V6 or V4 Virtual Router MAC | |
75 | * | |
76 | * vrid | |
77 | * Virtual Router Identifier | |
78 | */ | |
79 | static void vrrp_mac_set(struct ethaddr *mac, bool v6, uint8_t vrid) | |
80 | { | |
81 | /* | |
82 | * V4: 00-00-5E-00-01-{VRID} | |
83 | * V6: 00-00-5E-00-02-{VRID} | |
84 | */ | |
85 | mac->octet[0] = 0x00; | |
86 | mac->octet[1] = 0x00; | |
87 | mac->octet[2] = 0x5E; | |
88 | mac->octet[3] = 0x00; | |
89 | mac->octet[4] = v6 ? 0x02 : 0x01; | |
90 | mac->octet[5] = vrid; | |
91 | } | |
92 | ||
93 | /* | |
94 | * Recalculates and sets skew_time and master_down_interval based | |
95 | * values. | |
96 | * | |
97 | * r | |
98 | * VRRP Router to operate on | |
99 | */ | |
100 | static void vrrp_recalculate_timers(struct vrrp_router *r) | |
101 | { | |
102 | uint16_t mdiadv = r->vr->version == 3 ? r->master_adver_interval | |
103 | : r->vr->advertisement_interval; | |
104 | uint16_t skm = (r->vr->version == 3) ? r->master_adver_interval : 100; | |
105 | ||
106 | r->skew_time = ((256 - r->vr->priority) * skm) / 256; | |
107 | r->master_down_interval = 3 * mdiadv; | |
108 | r->master_down_interval += r->skew_time; | |
109 | } | |
110 | ||
111 | /* | |
112 | * Determines if a VRRP router is the owner of the specified address. | |
113 | * | |
114 | * The determining factor for whether an interface is the address owner is | |
115 | * simply whether the address is assigned to the VRRP base interface by someone | |
116 | * other than vrrpd. | |
117 | * | |
118 | * This function should always return the correct answer regardless of | |
119 | * master/backup status. | |
120 | * | |
121 | * ifp | |
122 | * The interface to check owernship of. This should be the base interface of | |
123 | * a VRRP router. | |
124 | * | |
125 | * vr | |
126 | * Virtual Router | |
127 | * | |
128 | * Returns: | |
129 | * whether or not vr owns the specified address | |
130 | */ | |
131 | static bool vrrp_is_owner(struct interface *ifp, struct ipaddr *addr) | |
132 | { | |
133 | /* | |
134 | * This code sanity checks implicit ownership configuration. Ideally, | |
135 | * the way we determine address ownership status for this VRRP router | |
136 | * is by looking at whether our VIPs are also assigned to the base | |
137 | * interface, and therefore count as "real" addresses. This frees the | |
138 | * user from having to manually configure priority 255 to indicate | |
139 | * address ownership. However, this means one of the VIPs will be used | |
140 | * as the source address for VRRP advertisements, which in turn means | |
141 | * that other VRRP routers will be receiving packets with a source | |
142 | * address they themselves have. This causes lots of different issues | |
143 | * so for now we're disabling this and forcing the user to configure | |
144 | * priority 255 to indicate ownership. | |
145 | */ | |
146 | ||
147 | return false; | |
148 | ||
149 | #if 0 | |
150 | struct prefix p; | |
151 | ||
152 | p.family = IS_IPADDR_V4(addr) ? AF_INET : AF_INET6; | |
153 | p.prefixlen = IS_IPADDR_V4(addr) ? IPV4_MAX_BITLEN : IPV6_MAX_BITLEN; | |
154 | memcpy(&p.u, &addr->ip, sizeof(addr->ip)); | |
155 | ||
156 | return !!connected_lookup_prefix_exact(ifp, &p); | |
157 | #endif | |
158 | } | |
159 | ||
160 | /* | |
161 | * Whether an interface has a MAC address that matches the VRRP RFC. | |
162 | * | |
163 | * ifp | |
164 | * Interface to check | |
165 | * | |
166 | * Returns: | |
167 | * Whether the interface has a VRRP mac or not | |
168 | */ | |
169 | static bool vrrp_ifp_has_vrrp_mac(struct interface *ifp) | |
170 | { | |
171 | struct ethaddr vmac4; | |
172 | struct ethaddr vmac6; | |
173 | ||
174 | vrrp_mac_set(&vmac4, 0, 0x00); | |
175 | vrrp_mac_set(&vmac6, 1, 0x00); | |
176 | ||
177 | return !memcmp(ifp->hw_addr, vmac4.octet, sizeof(vmac4.octet) - 1) | |
178 | || !memcmp(ifp->hw_addr, vmac6.octet, sizeof(vmac6.octet) - 1); | |
179 | } | |
180 | ||
181 | /* | |
182 | * Lookup a Virtual Router instance given a macvlan subinterface. | |
183 | * | |
184 | * The VRID is extracted from the interface MAC and the 2-tuple (iface, vrid) | |
185 | * is used to look up any existing instances that match the interface. It does | |
186 | * not matter whether the instance is already bound to the interface or not. | |
187 | * | |
188 | * mvl_ifp | |
189 | * Interface pointer to use to lookup. Should be a macvlan device. | |
190 | * | |
191 | * Returns: | |
192 | * Virtual Router, if found | |
193 | * NULL otherwise | |
194 | */ | |
195 | static struct vrrp_vrouter *vrrp_lookup_by_if_mvl(struct interface *mvl_ifp) | |
196 | { | |
197 | struct interface *p; | |
198 | ||
199 | if (!mvl_ifp || mvl_ifp->link_ifindex == 0 | |
200 | || !vrrp_ifp_has_vrrp_mac(mvl_ifp)) { | |
201 | if (mvl_ifp && mvl_ifp->link_ifindex == 0) | |
202 | DEBUGD(&vrrp_dbg_zebra, | |
203 | VRRP_LOGPFX | |
204 | "Interface %s has no parent ifindex; disregarding", | |
205 | mvl_ifp->name); | |
206 | if (mvl_ifp && !vrrp_ifp_has_vrrp_mac(mvl_ifp)) | |
207 | DEBUGD(&vrrp_dbg_zebra, | |
208 | VRRP_LOGPFX | |
209 | "Interface %s has a non-VRRP MAC; disregarding", | |
210 | mvl_ifp->name); | |
211 | return NULL; | |
212 | } | |
213 | ||
214 | p = if_lookup_by_index(mvl_ifp->link_ifindex, VRF_DEFAULT); | |
215 | uint8_t vrid = mvl_ifp->hw_addr[5]; | |
216 | ||
217 | return vrrp_lookup(p, vrid); | |
218 | } | |
219 | ||
220 | /* | |
221 | * Lookup the Virtual Router instances configured on a particular interface. | |
222 | * | |
223 | * ifp | |
224 | * Interface pointer to use to lookup. Should not be a macvlan device. | |
225 | * | |
226 | * Returns: | |
227 | * List of virtual routers found | |
228 | */ | |
229 | static struct list *vrrp_lookup_by_if(struct interface *ifp) | |
230 | { | |
231 | struct list *l = hash_to_list(vrrp_vrouters_hash); | |
232 | struct listnode *ln, *nn; | |
233 | struct vrrp_vrouter *vr; | |
234 | ||
235 | for (ALL_LIST_ELEMENTS(l, ln, nn, vr)) | |
236 | if (vr->ifp != ifp) | |
237 | list_delete_node(l, ln); | |
238 | ||
239 | return l; | |
240 | } | |
241 | ||
242 | /* | |
243 | * Lookup any Virtual Router instances associated with a particular interface. | |
244 | * This is a combination of the results from vrrp_lookup_by_if_mvl and | |
245 | * vrrp_lookup_by_if. | |
246 | * | |
247 | * Suppose the system interface list looks like the following: | |
248 | * | |
249 | * eth0 | |
250 | * \- eth0-v0 00:00:5e:00:01:01 | |
251 | * \- eth0-v1 00:00:5e:00:02:01 | |
252 | * \- eth0-v2 00:00:5e:00:01:0a | |
253 | * | |
254 | * Passing eth0-v2 to this function will give you the VRRP instance configured | |
255 | * on eth0 with VRID 10. Passing eth0-v0 or eth0-v1 will give you the VRRP | |
256 | * instance configured on eth0 with VRID 1. Passing eth0 will give you both. | |
257 | * | |
258 | * ifp | |
259 | * Interface pointer to use to lookup. Can be any interface. | |
260 | * | |
261 | * Returns: | |
262 | * List of virtual routers found | |
263 | */ | |
264 | static struct list *vrrp_lookup_by_if_any(struct interface *ifp) | |
265 | { | |
266 | struct vrrp_vrouter *vr; | |
267 | struct list *vrs; | |
268 | ||
269 | vr = vrrp_lookup_by_if_mvl(ifp); | |
270 | vrs = vr ? list_new() : vrrp_lookup_by_if(ifp); | |
271 | ||
272 | if (vr) | |
273 | listnode_add(vrs, vr); | |
274 | ||
275 | return vrs; | |
276 | } | |
277 | ||
278 | /* Configuration controllers ----------------------------------------------- */ | |
279 | ||
280 | void vrrp_check_start(struct vrrp_vrouter *vr) | |
281 | { | |
282 | struct vrrp_router *r; | |
283 | bool start; | |
284 | const char *whynot = NULL; | |
285 | ||
286 | if (vr->shutdown || vr->ifp == NULL) | |
287 | return; | |
288 | ||
289 | r = vr->v4; | |
290 | /* Must not already be started */ | |
291 | start = r->fsm.state == VRRP_STATE_INITIALIZE; | |
292 | whynot = (!start && !whynot) ? "Already running" : whynot; | |
293 | /* Must have a parent interface */ | |
294 | start = start && (vr->ifp != NULL); | |
295 | whynot = (!start && !whynot) ? "No base interface" : whynot; | |
296 | #if 0 | |
297 | /* Parent interface must be up */ | |
298 | start = start && if_is_operative(vr->ifp); | |
299 | start = (!start && !whynot) ? "Base interface inoperative" : whynot; | |
300 | #endif | |
301 | /* Parent interface must have at least one v4 */ | |
302 | start = start && connected_count_by_family(vr->ifp, AF_INET) > 0; | |
303 | whynot = (!start && !whynot) ? "No primary IPv4 address" : whynot; | |
304 | /* Must have a macvlan interface */ | |
305 | start = start && (r->mvl_ifp != NULL); | |
306 | whynot = (!start && !whynot) ? "No VRRP interface" : whynot; | |
307 | #if 0 | |
308 | /* Macvlan interface must be admin up */ | |
309 | start = start && CHECK_FLAG(r->mvl_ifp->flags, IFF_UP); | |
310 | start = (!start && !whynot) ? "Macvlan device admin down" : whynot; | |
311 | #endif | |
312 | /* Must have at least one VIP configured */ | |
313 | start = start && r->addrs->count > 0; | |
314 | whynot = (!start && !whynot) ? "No Virtual IP address configured" | |
315 | : whynot; | |
316 | if (start) | |
317 | vrrp_event(r, VRRP_EVENT_STARTUP); | |
318 | else if (whynot) | |
319 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
320 | "Refusing to start Virtual Router: %s", | |
321 | vr->vrid, family2str(r->family), whynot); | |
322 | ||
323 | whynot = NULL; | |
324 | ||
325 | r = vr->v6; | |
326 | /* Must not already be started */ | |
327 | start = r->fsm.state == VRRP_STATE_INITIALIZE; | |
328 | whynot = (!start && !whynot) ? "Already running" : whynot; | |
329 | /* Must not be v2 */ | |
330 | start = start && vr->version != 2; | |
331 | whynot = (!start && !whynot) ? "VRRPv2 does not support v6" : whynot; | |
332 | /* Must have a parent interface */ | |
333 | start = start && (vr->ifp != NULL); | |
334 | whynot = (!start && !whynot) ? "No base interface" : whynot; | |
335 | #if 0 | |
336 | /* Parent interface must be up */ | |
337 | start = start && if_is_operative(vr->ifp); | |
338 | start = (!start && !whynot) ? "Base interface inoperative" : whynot; | |
339 | #endif | |
340 | /* Must have a macvlan interface */ | |
341 | start = start && (r->mvl_ifp != NULL); | |
342 | whynot = (!start && !whynot) ? "No VRRP interface" : whynot; | |
343 | #if 0 | |
344 | /* Macvlan interface must be admin up */ | |
345 | start = start && CHECK_FLAG(r->mvl_ifp->flags, IFF_UP); | |
346 | start = (!start && !whynot) ? "Macvlan device admin down" : whynot; | |
347 | /* Macvlan interface must have a link local */ | |
348 | start = start && connected_get_linklocal(r->mvl_ifp); | |
349 | whynot = | |
350 | (!start && !whynot) ? "No link local address configured" : whynot; | |
351 | /* Macvlan interface must have a v6 IP besides the link local */ | |
352 | start = start && (connected_count_by_family(r->mvl_ifp, AF_INET6) > 1); | |
353 | whynot = (!start && !whynot) | |
354 | ? "No Virtual IPv6 address configured on macvlan device" | |
355 | : whynot; | |
356 | #endif | |
357 | /* Must have at least one VIP configured */ | |
358 | start = start && r->addrs->count > 0; | |
359 | whynot = | |
360 | (!start && !whynot) ? "No Virtual IP address configured" : whynot; | |
361 | if (start) | |
362 | vrrp_event(r, VRRP_EVENT_STARTUP); | |
363 | else if (whynot) | |
364 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
365 | "Refusing to start Virtual Router: %s", | |
366 | vr->vrid, family2str(r->family), whynot); | |
367 | } | |
368 | ||
369 | void vrrp_set_priority(struct vrrp_vrouter *vr, uint8_t priority) | |
370 | { | |
371 | vr->priority = priority; | |
372 | vr->v4->priority = priority; | |
373 | vr->v6->priority = priority; | |
374 | } | |
375 | ||
376 | void vrrp_set_advertisement_interval(struct vrrp_vrouter *vr, | |
377 | uint16_t advertisement_interval) | |
378 | { | |
379 | if (vr->advertisement_interval == advertisement_interval) | |
380 | return; | |
381 | ||
382 | vr->advertisement_interval = advertisement_interval; | |
383 | vrrp_recalculate_timers(vr->v4); | |
384 | vrrp_recalculate_timers(vr->v6); | |
385 | } | |
386 | ||
387 | static bool vrrp_has_ip(struct vrrp_vrouter *vr, struct ipaddr *ip) | |
388 | { | |
389 | struct vrrp_router *r = ip->ipa_type == IPADDR_V4 ? vr->v4 : vr->v6; | |
390 | struct listnode *ln; | |
391 | struct ipaddr *iter; | |
392 | ||
393 | for (ALL_LIST_ELEMENTS_RO(r->addrs, ln, iter)) | |
394 | if (!memcmp(&iter->ip, &ip->ip, IPADDRSZ(ip))) | |
395 | return true; | |
396 | ||
397 | return false; | |
398 | } | |
399 | ||
400 | int vrrp_add_ip(struct vrrp_router *r, struct ipaddr *ip) | |
401 | { | |
402 | int af = (ip->ipa_type == IPADDR_V6) ? AF_INET6 : AF_INET; | |
403 | ||
404 | assert(r->family == af); | |
405 | assert(!(r->vr->version == 2 && ip->ipa_type == IPADDR_V6)); | |
406 | ||
407 | if (vrrp_has_ip(r->vr, ip)) | |
408 | return 0; | |
409 | ||
410 | if (!vrrp_is_owner(r->vr->ifp, ip) && r->is_owner) { | |
411 | char ipbuf[INET6_ADDRSTRLEN]; | |
412 | ||
413 | inet_ntop(r->family, &ip->ip, ipbuf, sizeof(ipbuf)); | |
414 | zlog_err( | |
415 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
416 | "This VRRP router is not the address owner of %s, but is the address owner of other addresses; this config is unsupported.", | |
417 | r->vr->vrid, family2str(r->family), ipbuf); | |
418 | return -1; | |
419 | } | |
420 | ||
421 | struct ipaddr *new = XCALLOC(MTYPE_VRRP_IP, sizeof(struct ipaddr)); | |
422 | ||
423 | *new = *ip; | |
424 | listnode_add(r->addrs, new); | |
425 | ||
426 | if (r->fsm.state == VRRP_STATE_MASTER) { | |
427 | switch (r->family) { | |
428 | case AF_INET: | |
429 | vrrp_garp_send(r, &new->ipaddr_v4); | |
430 | break; | |
431 | case AF_INET6: | |
432 | vrrp_ndisc_una_send(r, new); | |
433 | break; | |
434 | } | |
435 | } | |
436 | ||
437 | return 0; | |
438 | } | |
439 | ||
440 | int vrrp_add_ipv4(struct vrrp_vrouter *vr, struct in_addr v4) | |
441 | { | |
442 | struct ipaddr ip; | |
443 | ||
444 | ip.ipa_type = IPADDR_V4; | |
445 | ip.ipaddr_v4 = v4; | |
446 | return vrrp_add_ip(vr->v4, &ip); | |
447 | } | |
448 | ||
449 | int vrrp_add_ipv6(struct vrrp_vrouter *vr, struct in6_addr v6) | |
450 | { | |
451 | assert(vr->version != 2); | |
452 | ||
453 | struct ipaddr ip; | |
454 | ||
455 | ip.ipa_type = IPADDR_V6; | |
456 | ip.ipaddr_v6 = v6; | |
457 | return vrrp_add_ip(vr->v6, &ip); | |
458 | } | |
459 | ||
460 | int vrrp_del_ip(struct vrrp_router *r, struct ipaddr *ip) | |
461 | { | |
462 | struct listnode *ln, *nn; | |
463 | struct ipaddr *iter; | |
464 | int ret = 0; | |
465 | ||
466 | if (!vrrp_has_ip(r->vr, ip)) | |
467 | return 0; | |
468 | ||
469 | for (ALL_LIST_ELEMENTS(r->addrs, ln, nn, iter)) | |
470 | if (!memcmp(&iter->ip, &ip->ip, IPADDRSZ(ip))) | |
471 | list_delete_node(r->addrs, ln); | |
472 | ||
473 | /* | |
474 | * NB: Deleting the last address and then issuing a shutdown will cause | |
475 | * transmission of a priority 0 VRRP Advertisement - as per the RFC - | |
476 | * but it will have no addresses. This is not forbidden in the RFC but | |
477 | * might confuse other implementations. | |
478 | */ | |
479 | if (r->addrs->count == 0 && r->fsm.state != VRRP_STATE_INITIALIZE) | |
480 | ret = vrrp_event(r, VRRP_EVENT_SHUTDOWN); | |
481 | ||
482 | return ret; | |
483 | } | |
484 | ||
485 | int vrrp_del_ipv6(struct vrrp_vrouter *vr, struct in6_addr v6) | |
486 | { | |
487 | struct ipaddr ip; | |
488 | ||
489 | ip.ipa_type = IPADDR_V6; | |
490 | ip.ipaddr_v6 = v6; | |
491 | return vrrp_del_ip(vr->v6, &ip); | |
492 | } | |
493 | ||
494 | int vrrp_del_ipv4(struct vrrp_vrouter *vr, struct in_addr v4) | |
495 | { | |
496 | struct ipaddr ip; | |
497 | ||
498 | ip.ipa_type = IPADDR_V4; | |
499 | ip.ipaddr_v4 = v4; | |
500 | return vrrp_del_ip(vr->v4, &ip); | |
501 | } | |
502 | ||
503 | ||
504 | /* Creation and destruction ------------------------------------------------ */ | |
505 | ||
506 | static void vrrp_router_addr_list_del_cb(void *val) | |
507 | { | |
508 | struct ipaddr *ip = val; | |
509 | ||
510 | XFREE(MTYPE_VRRP_IP, ip); | |
511 | } | |
512 | ||
513 | /* | |
514 | * Search for a suitable macvlan subinterface we can attach to, and if found, | |
515 | * attach to it. | |
516 | * | |
517 | * r | |
518 | * Router to attach to interface | |
519 | * | |
520 | * Returns: | |
521 | * Whether an interface was successfully attached | |
522 | */ | |
523 | static bool vrrp_attach_interface(struct vrrp_router *r) | |
524 | { | |
525 | /* Search for existing interface with computed MAC address */ | |
526 | struct interface **ifps; | |
527 | ||
528 | size_t ifps_cnt = if_lookup_by_hwaddr( | |
529 | r->vmac.octet, sizeof(r->vmac.octet), &ifps, VRF_DEFAULT); | |
530 | ||
531 | /* | |
532 | * Filter to only those macvlan interfaces whose parent is the base | |
533 | * interface this VRRP router is configured on. | |
534 | * | |
535 | * If there are still multiple interfaces we just select the first one, | |
536 | * as it should be functionally identical to the others. | |
537 | */ | |
538 | unsigned int candidates = 0; | |
539 | struct interface *selection = NULL; | |
540 | ||
541 | for (unsigned int i = 0; i < ifps_cnt; i++) { | |
542 | if (ifps[i]->link_ifindex != r->vr->ifp->ifindex) | |
543 | ifps[i] = NULL; | |
544 | else { | |
545 | selection = selection ? selection : ifps[i]; | |
546 | candidates++; | |
547 | } | |
548 | } | |
549 | ||
550 | if (ifps_cnt) | |
551 | XFREE(MTYPE_TMP, ifps); | |
552 | ||
553 | char ethstr[ETHER_ADDR_STRLEN]; | |
554 | ||
555 | prefix_mac2str(&r->vmac, ethstr, sizeof(ethstr)); | |
556 | ||
557 | assert(!!selection == !!candidates); | |
558 | ||
559 | if (candidates == 0) | |
560 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
561 | "Interface: None (no interface found w/ MAC %s)", | |
562 | r->vr->vrid, family2str(r->family), ethstr); | |
563 | else if (candidates > 1) | |
564 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
565 | "Interface: Multiple interfaces found; using %s", | |
566 | r->vr->vrid, family2str(r->family), selection->name); | |
567 | else | |
568 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
569 | "Interface: %s", | |
570 | r->vr->vrid, family2str(r->family), selection->name); | |
571 | ||
572 | r->mvl_ifp = selection; | |
573 | ||
574 | return !!r->mvl_ifp; | |
575 | } | |
576 | ||
577 | static struct vrrp_router *vrrp_router_create(struct vrrp_vrouter *vr, | |
578 | int family) | |
579 | { | |
580 | struct vrrp_router *r = | |
581 | XCALLOC(MTYPE_VRRP_RTR, sizeof(struct vrrp_router)); | |
582 | ||
583 | r->family = family; | |
584 | r->sock_rx = -1; | |
585 | r->sock_tx = -1; | |
586 | r->vr = vr; | |
587 | r->addrs = list_new(); | |
588 | r->addrs->del = vrrp_router_addr_list_del_cb; | |
589 | r->priority = vr->priority; | |
590 | r->fsm.state = VRRP_STATE_INITIALIZE; | |
591 | vrrp_mac_set(&r->vmac, family == AF_INET6, vr->vrid); | |
592 | ||
593 | vrrp_attach_interface(r); | |
594 | ||
595 | return r; | |
596 | } | |
597 | ||
598 | static void vrrp_router_destroy(struct vrrp_router *r) | |
599 | { | |
600 | if (r->is_active) | |
601 | vrrp_event(r, VRRP_EVENT_SHUTDOWN); | |
602 | ||
603 | if (r->sock_rx >= 0) | |
604 | close(r->sock_rx); | |
605 | if (r->sock_tx >= 0) | |
606 | close(r->sock_tx); | |
607 | ||
608 | /* FIXME: also delete list elements */ | |
609 | list_delete(&r->addrs); | |
610 | XFREE(MTYPE_VRRP_RTR, r); | |
611 | } | |
612 | ||
613 | struct vrrp_vrouter *vrrp_vrouter_create(struct interface *ifp, uint8_t vrid, | |
614 | uint8_t version) | |
615 | { | |
616 | struct vrrp_vrouter *vr = vrrp_lookup(ifp, vrid); | |
617 | ||
618 | if (vr) | |
619 | return vr; | |
620 | ||
621 | if (version != 2 && version != 3) | |
622 | return NULL; | |
623 | ||
624 | vr = XCALLOC(MTYPE_VRRP_RTR, sizeof(struct vrrp_vrouter)); | |
625 | ||
626 | vr->ifp = ifp; | |
627 | vr->version = version; | |
628 | vr->vrid = vrid; | |
629 | vr->priority = vd.priority; | |
630 | vr->preempt_mode = vd.preempt_mode; | |
631 | vr->accept_mode = vd.accept_mode; | |
632 | vr->shutdown = vd.shutdown; | |
633 | ||
634 | vr->v4 = vrrp_router_create(vr, AF_INET); | |
635 | vr->v6 = vrrp_router_create(vr, AF_INET6); | |
636 | ||
637 | vrrp_set_advertisement_interval(vr, vd.advertisement_interval); | |
638 | ||
639 | hash_get(vrrp_vrouters_hash, vr, hash_alloc_intern); | |
640 | ||
641 | return vr; | |
642 | } | |
643 | ||
644 | void vrrp_vrouter_destroy(struct vrrp_vrouter *vr) | |
645 | { | |
646 | vrrp_router_destroy(vr->v4); | |
647 | vrrp_router_destroy(vr->v6); | |
648 | hash_release(vrrp_vrouters_hash, vr); | |
649 | XFREE(MTYPE_VRRP_RTR, vr); | |
650 | } | |
651 | ||
652 | struct vrrp_vrouter *vrrp_lookup(struct interface *ifp, uint8_t vrid) | |
653 | { | |
654 | struct vrrp_vrouter vr; | |
655 | ||
656 | vr.vrid = vrid; | |
657 | vr.ifp = ifp; | |
658 | ||
659 | return hash_lookup(vrrp_vrouters_hash, &vr); | |
660 | } | |
661 | ||
662 | /* Network ----------------------------------------------------------------- */ | |
663 | ||
664 | /* Forward decls */ | |
665 | static void vrrp_change_state(struct vrrp_router *r, int to); | |
666 | static int vrrp_adver_timer_expire(struct thread *thread); | |
667 | static int vrrp_master_down_timer_expire(struct thread *thread); | |
668 | ||
669 | /* | |
670 | * Finds the first connected address of the appropriate family on a VRRP | |
671 | * router's interface and binds the Tx socket of the VRRP router to that | |
672 | * address. | |
673 | * | |
674 | * Also sets src field of vrrp_router. | |
675 | * | |
676 | * r | |
677 | * VRRP router to operate on | |
678 | * | |
679 | * Returns: | |
680 | * 0 on success | |
681 | * -1 on failure | |
682 | */ | |
683 | static int vrrp_bind_to_primary_connected(struct vrrp_router *r) | |
684 | { | |
685 | char ipstr[INET6_ADDRSTRLEN]; | |
686 | struct interface *ifp; | |
687 | ||
688 | /* | |
689 | * A slight quirk: the RFC specifies that advertisements under IPv6 must | |
690 | * be transmitted using the link local address of the source interface | |
691 | */ | |
692 | ifp = r->family == AF_INET ? r->vr->ifp : r->mvl_ifp; | |
693 | ||
694 | struct listnode *ln; | |
695 | struct connected *c = NULL; | |
696 | ||
697 | for (ALL_LIST_ELEMENTS_RO(ifp->connected, ln, c)) | |
698 | if (c->address->family == r->family) { | |
699 | if (r->family == AF_INET6 | |
700 | && IN6_IS_ADDR_LINKLOCAL(&c->address->u.prefix6)) | |
701 | break; | |
702 | else if (r->family == AF_INET) | |
703 | break; | |
704 | } | |
705 | ||
706 | if (c == NULL) { | |
707 | zlog_err(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
708 | "Failed to find address to bind on %s", | |
709 | r->vr->vrid, family2str(r->family), ifp->name); | |
710 | return -1; | |
711 | } | |
712 | ||
713 | union sockunion su; | |
714 | ||
715 | memset(&su, 0x00, sizeof(su)); | |
716 | ||
717 | switch (r->family) { | |
718 | case AF_INET: | |
719 | r->src.ipa_type = IPADDR_V4; | |
720 | r->src.ipaddr_v4 = c->address->u.prefix4; | |
721 | su.sin.sin_family = AF_INET; | |
722 | su.sin.sin_addr = c->address->u.prefix4; | |
723 | break; | |
724 | case AF_INET6: | |
725 | r->src.ipa_type = IPADDR_V6; | |
726 | r->src.ipaddr_v6 = c->address->u.prefix6; | |
727 | su.sin6.sin6_family = AF_INET6; | |
728 | su.sin6.sin6_scope_id = ifp->ifindex; | |
729 | su.sin6.sin6_addr = c->address->u.prefix6; | |
730 | break; | |
731 | } | |
732 | ||
733 | int ret = 0; | |
734 | ||
735 | sockopt_reuseaddr(r->sock_tx); | |
736 | if (bind(r->sock_tx, (const struct sockaddr *)&su, sizeof(su)) < 0) { | |
737 | zlog_err( | |
738 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
739 | "Failed to bind Tx socket to primary IP address %s: %s", | |
740 | r->vr->vrid, family2str(r->family), | |
741 | inet_ntop(r->family, | |
742 | (const void *)&c->address->u.prefix, ipstr, | |
743 | sizeof(ipstr)), | |
744 | safe_strerror(errno)); | |
745 | ret = -1; | |
746 | } else { | |
747 | DEBUGD(&vrrp_dbg_sock, | |
748 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
749 | "Bound Tx socket to primary IP address %s", | |
750 | r->vr->vrid, family2str(r->family), | |
751 | inet_ntop(r->family, (const void *)&c->address->u.prefix, | |
752 | ipstr, sizeof(ipstr))); | |
753 | } | |
754 | ||
755 | return ret; | |
756 | } | |
757 | ||
758 | ||
759 | /* | |
760 | * Create and multicast a VRRP ADVERTISEMENT message. | |
761 | * | |
762 | * r | |
763 | * VRRP Router for which to send ADVERTISEMENT | |
764 | */ | |
765 | static void vrrp_send_advertisement(struct vrrp_router *r) | |
766 | { | |
767 | struct vrrp_pkt *pkt; | |
768 | ssize_t pktsz; | |
769 | struct ipaddr *addrs[r->addrs->count]; | |
770 | union sockunion dest; | |
771 | ||
772 | if (r->src.ipa_type == IPADDR_NONE | |
773 | && vrrp_bind_to_primary_connected(r) < 0) | |
774 | return; | |
775 | ||
776 | list_to_array(r->addrs, (void **)addrs, r->addrs->count); | |
777 | ||
778 | pktsz = vrrp_pkt_adver_build(&pkt, &r->src, r->vr->version, r->vr->vrid, | |
779 | r->priority, r->vr->advertisement_interval, | |
780 | r->addrs->count, (struct ipaddr **)&addrs); | |
781 | ||
782 | if (DEBUG_MODE_CHECK(&vrrp_dbg_pkt, DEBUG_MODE_ALL)) | |
783 | zlog_hexdump(pkt, (size_t)pktsz); | |
784 | ||
785 | const char *group = r->family == AF_INET ? VRRP_MCASTV4_GROUP_STR | |
786 | : VRRP_MCASTV6_GROUP_STR; | |
787 | (void)str2sockunion(group, &dest); | |
788 | ||
789 | ssize_t sent = sendto(r->sock_tx, pkt, (size_t)pktsz, 0, &dest.sa, | |
790 | sockunion_sizeof(&dest)); | |
791 | ||
792 | vrrp_pkt_free(pkt); | |
793 | ||
794 | if (sent < 0) { | |
795 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
796 | "Failed to send VRRP Advertisement: %s", | |
797 | r->vr->vrid, family2str(r->family), | |
798 | safe_strerror(errno)); | |
799 | } else { | |
800 | ++r->stats.adver_tx_cnt; | |
801 | } | |
802 | } | |
803 | ||
804 | /* | |
805 | * Receive and parse VRRP advertisement. | |
806 | * | |
807 | * By the time we get here all fields have been validated for basic correctness | |
808 | * and the packet is a valid VRRP packet. | |
809 | * | |
810 | * However, we have not validated whether the VRID is correct for this virtual | |
811 | * router, nor whether the priority is correct (i.e. is not 255 when we are the | |
812 | * address owner), nor whether the advertisement interval equals our own | |
813 | * configured value (this check is only performed in VRRPv2). | |
814 | * | |
815 | * r | |
816 | * VRRP Router associated with the socket this advertisement was received on | |
817 | * | |
818 | * src | |
819 | * Source address of sender | |
820 | * | |
821 | * pkt | |
822 | * The advertisement they sent | |
823 | * | |
824 | * pktsize | |
825 | * Size of advertisement | |
826 | * | |
827 | * Returns: | |
828 | * -1 if advertisement is invalid | |
829 | * 0 otherwise | |
830 | */ | |
831 | static int vrrp_recv_advertisement(struct vrrp_router *r, struct ipaddr *src, | |
832 | struct vrrp_pkt *pkt, size_t pktsize) | |
833 | { | |
834 | char sipstr[INET6_ADDRSTRLEN]; | |
835 | char dipstr[INET6_ADDRSTRLEN]; | |
836 | ||
837 | ipaddr2str(src, sipstr, sizeof(sipstr)); | |
838 | ipaddr2str(&r->src, dipstr, sizeof(dipstr)); | |
839 | ||
840 | char dumpbuf[BUFSIZ]; | |
841 | ||
842 | vrrp_pkt_adver_dump(dumpbuf, sizeof(dumpbuf), pkt); | |
843 | DEBUGD(&vrrp_dbg_proto, | |
844 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
845 | "Received VRRP Advertisement from %s:\n%s", | |
846 | r->vr->vrid, family2str(r->family), sipstr, dumpbuf); | |
847 | ||
848 | /* Check that VRID matches our configured VRID */ | |
849 | if (pkt->hdr.vrid != r->vr->vrid) { | |
850 | DEBUGD(&vrrp_dbg_proto, | |
851 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
852 | "Datagram invalid: Advertisement contains VRID %" PRIu8 | |
853 | " which does not match our instance", | |
854 | r->vr->vrid, family2str(r->family), pkt->hdr.vrid); | |
855 | return -1; | |
856 | } | |
857 | ||
858 | /* Verify that we are not the IPvX address owner */ | |
859 | if (r->is_owner) { | |
860 | DEBUGD(&vrrp_dbg_proto, | |
861 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
862 | "Datagram invalid: Received advertisement but we are the address owner", | |
863 | r->vr->vrid, family2str(r->family)); | |
864 | return -1; | |
865 | } | |
866 | ||
867 | /* If v2, verify that adver time matches ours */ | |
868 | bool adveq = (pkt->hdr.v2.adver_int | |
869 | == MAX(r->vr->advertisement_interval / 100, 1)); | |
870 | if (r->vr->version == 2 && !adveq) { | |
871 | DEBUGD(&vrrp_dbg_proto, | |
872 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
873 | "Datagram invalid: Received advertisement with advertisement interval %" PRIu8 | |
874 | " unequal to our configured value %u", | |
875 | r->vr->vrid, family2str(r->family), | |
876 | pkt->hdr.v2.adver_int, | |
877 | MAX(r->vr->advertisement_interval / 100, 1)); | |
878 | return -1; | |
879 | } | |
880 | ||
881 | ||
882 | /* Check that # IPs received matches our # configured IPs */ | |
883 | if (pkt->hdr.naddr != r->addrs->count) | |
884 | DEBUGD(&vrrp_dbg_proto, | |
885 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
886 | "Datagram has %" PRIu8 | |
887 | " addresses, but this VRRP instance has %u", | |
888 | r->vr->vrid, family2str(r->family), pkt->hdr.naddr, | |
889 | r->addrs->count); | |
890 | ||
891 | ++r->stats.adver_rx_cnt; | |
892 | ||
893 | int addrcmp; | |
894 | ||
895 | switch (r->fsm.state) { | |
896 | case VRRP_STATE_MASTER: | |
897 | addrcmp = memcmp(&src->ip, &r->src.ip, IPADDRSZ(src)); | |
898 | ||
899 | if (pkt->hdr.priority == 0) { | |
900 | vrrp_send_advertisement(r); | |
901 | THREAD_OFF(r->t_adver_timer); | |
902 | thread_add_timer_msec( | |
903 | master, vrrp_adver_timer_expire, r, | |
904 | r->vr->advertisement_interval * CS2MS, | |
905 | &r->t_adver_timer); | |
906 | } else if (pkt->hdr.priority > r->priority | |
907 | || ((pkt->hdr.priority == r->priority) | |
908 | && addrcmp > 0)) { | |
909 | zlog_info( | |
910 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
911 | "Received advertisement from %s w/ priority %" PRIu8 | |
912 | "; switching to Backup", | |
913 | r->vr->vrid, family2str(r->family), sipstr, | |
914 | pkt->hdr.priority); | |
915 | THREAD_OFF(r->t_adver_timer); | |
916 | if (r->vr->version == 3) { | |
917 | r->master_adver_interval = | |
918 | htons(pkt->hdr.v3.adver_int); | |
919 | } | |
920 | vrrp_recalculate_timers(r); | |
921 | THREAD_OFF(r->t_master_down_timer); | |
922 | thread_add_timer_msec(master, | |
923 | vrrp_master_down_timer_expire, r, | |
924 | r->master_down_interval * CS2MS, | |
925 | &r->t_master_down_timer); | |
926 | vrrp_change_state(r, VRRP_STATE_BACKUP); | |
927 | } else { | |
928 | /* Discard advertisement */ | |
929 | DEBUGD(&vrrp_dbg_proto, | |
930 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
931 | "Discarding advertisement from %s (%" PRIu8 | |
932 | " <= %" PRIu8 " & %s <= %s)", | |
933 | r->vr->vrid, family2str(r->family), sipstr, | |
934 | pkt->hdr.priority, r->priority, sipstr, dipstr); | |
935 | } | |
936 | break; | |
937 | case VRRP_STATE_BACKUP: | |
938 | if (pkt->hdr.priority == 0) { | |
939 | THREAD_OFF(r->t_master_down_timer); | |
940 | thread_add_timer_msec( | |
941 | master, vrrp_master_down_timer_expire, r, | |
942 | r->skew_time * CS2MS, &r->t_master_down_timer); | |
943 | } else if (r->vr->preempt_mode == false | |
944 | || pkt->hdr.priority >= r->priority) { | |
945 | if (r->vr->version == 3) { | |
946 | r->master_adver_interval = | |
947 | ntohs(pkt->hdr.v3.adver_int); | |
948 | } | |
949 | vrrp_recalculate_timers(r); | |
950 | THREAD_OFF(r->t_master_down_timer); | |
951 | thread_add_timer_msec(master, | |
952 | vrrp_master_down_timer_expire, r, | |
953 | r->master_down_interval * CS2MS, | |
954 | &r->t_master_down_timer); | |
955 | } else if (r->vr->preempt_mode == true | |
956 | && pkt->hdr.priority < r->priority) { | |
957 | /* Discard advertisement */ | |
958 | DEBUGD(&vrrp_dbg_proto, | |
959 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
960 | "Discarding advertisement from %s (%" PRIu8 | |
961 | " < %" PRIu8 " & preempt = true)", | |
962 | r->vr->vrid, family2str(r->family), sipstr, | |
963 | pkt->hdr.priority, r->priority); | |
964 | } | |
965 | break; | |
966 | case VRRP_STATE_INITIALIZE: | |
967 | zlog_err(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
968 | "Received ADVERTISEMENT in state %s; this is a bug", | |
969 | r->vr->vrid, family2str(r->family), | |
970 | vrrp_state_names[r->fsm.state]); | |
971 | break; | |
972 | } | |
973 | ||
974 | return 0; | |
975 | } | |
976 | ||
977 | /* | |
978 | * Read and process next IPvX datagram. | |
979 | */ | |
980 | static int vrrp_read(struct thread *thread) | |
981 | { | |
982 | struct vrrp_router *r = thread->arg; | |
983 | ||
984 | struct vrrp_pkt *pkt; | |
985 | ssize_t pktsize; | |
986 | ssize_t nbytes; | |
987 | bool resched; | |
988 | char errbuf[BUFSIZ]; | |
989 | struct sockaddr_storage sa; | |
990 | uint8_t control[64]; | |
991 | struct ipaddr src = {}; | |
992 | ||
993 | struct msghdr m = {}; | |
994 | struct iovec iov; | |
995 | ||
996 | iov.iov_base = r->ibuf; | |
997 | iov.iov_len = sizeof(r->ibuf); | |
998 | m.msg_name = &sa; | |
999 | m.msg_namelen = sizeof(sa); | |
1000 | m.msg_iov = &iov; | |
1001 | m.msg_iovlen = 1; | |
1002 | m.msg_control = control; | |
1003 | m.msg_controllen = sizeof(control); | |
1004 | ||
1005 | nbytes = recvmsg(r->sock_rx, &m, MSG_DONTWAIT); | |
1006 | ||
1007 | if ((nbytes < 0 && ERRNO_IO_RETRY(errno))) { | |
1008 | resched = true; | |
1009 | goto done; | |
1010 | } else if (nbytes <= 0) { | |
1011 | vrrp_event(r, VRRP_EVENT_SHUTDOWN); | |
1012 | resched = false; | |
1013 | goto done; | |
1014 | } | |
1015 | ||
1016 | if (DEBUG_MODE_CHECK(&vrrp_dbg_pkt, DEBUG_MODE_ALL)) { | |
1017 | DEBUGD(&vrrp_dbg_pkt, | |
1018 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1019 | "Datagram rx: ", | |
1020 | r->vr->vrid, family2str(r->family)); | |
1021 | zlog_hexdump(r->ibuf, nbytes); | |
1022 | } | |
1023 | ||
1024 | pktsize = vrrp_pkt_parse_datagram(r->family, r->vr->version, &m, nbytes, | |
1025 | &src, &pkt, errbuf, sizeof(errbuf)); | |
1026 | ||
1027 | if (pktsize < 0) | |
1028 | DEBUGD(&vrrp_dbg_pkt, | |
1029 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1030 | "Datagram invalid: %s", | |
1031 | r->vr->vrid, family2str(r->family), errbuf); | |
1032 | else | |
1033 | vrrp_recv_advertisement(r, &src, pkt, pktsize); | |
1034 | ||
1035 | resched = true; | |
1036 | ||
1037 | done: | |
1038 | memset(r->ibuf, 0x00, sizeof(r->ibuf)); | |
1039 | ||
1040 | if (resched) | |
1041 | thread_add_read(master, vrrp_read, r, r->sock_rx, &r->t_read); | |
1042 | ||
1043 | return 0; | |
1044 | } | |
1045 | ||
1046 | /* | |
1047 | * Creates and configures VRRP router sockets. | |
1048 | * | |
1049 | * This function: | |
1050 | * - Creates two sockets, one for Tx, one for Rx | |
1051 | * - Joins the Rx socket to the appropriate VRRP multicast group | |
1052 | * - Sets the Tx socket to set the TTL (v4) or Hop Limit (v6) field to 255 for | |
1053 | * all transmitted IPvX packets | |
1054 | * - Requests the kernel to deliver IPv6 header values needed to validate VRRP | |
1055 | * packets | |
1056 | * | |
1057 | * If any of the above fail, the sockets are closed. The only exception is if | |
1058 | * the TTL / Hop Limit settings fail; these are logged, but configuration | |
1059 | * proceeds. | |
1060 | * | |
1061 | * The first connected address on the Virtual Router's interface is used as the | |
1062 | * interface address. | |
1063 | * | |
1064 | * r | |
1065 | * VRRP Router for which to create listen socket | |
1066 | * | |
1067 | * Returns: | |
1068 | * 0 on success | |
1069 | * -1 on failure | |
1070 | */ | |
1071 | static int vrrp_socket(struct vrrp_router *r) | |
1072 | { | |
1073 | int ret; | |
1074 | bool failed = false; | |
1075 | ||
1076 | frr_with_privs(&vrrp_privs) { | |
1077 | r->sock_rx = socket(r->family, SOCK_RAW, IPPROTO_VRRP); | |
1078 | r->sock_tx = socket(r->family, SOCK_RAW, IPPROTO_VRRP); | |
1079 | } | |
1080 | ||
1081 | if (r->sock_rx < 0 || r->sock_tx < 0) { | |
1082 | const char *rxtx = r->sock_rx < 0 ? "Rx" : "Tx"; | |
1083 | ||
1084 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1085 | "Can't create VRRP %s socket", | |
1086 | r->vr->vrid, family2str(r->family), rxtx); | |
1087 | failed = true; | |
1088 | goto done; | |
1089 | } | |
1090 | ||
1091 | /* Configure sockets */ | |
1092 | if (r->family == AF_INET) { | |
1093 | /* Set Tx socket to always Tx with TTL set to 255 */ | |
1094 | int ttl = 255; | |
1095 | ||
1096 | ret = setsockopt(r->sock_tx, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, | |
1097 | sizeof(ttl)); | |
1098 | if (ret < 0) { | |
1099 | zlog_warn( | |
1100 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1101 | "Failed to set outgoing multicast TTL count to 255; RFC 5798 compliant implementations will drop our packets", | |
1102 | r->vr->vrid, family2str(r->family)); | |
1103 | } | |
1104 | ||
1105 | /* Set Tx socket DSCP byte */ | |
1106 | setsockopt_ipv4_tos(r->sock_tx, IPTOS_PREC_INTERNETCONTROL); | |
1107 | ||
1108 | /* Turn off multicast loop on Tx */ | |
1109 | setsockopt_ipv4_multicast_loop(r->sock_tx, 0); | |
1110 | ||
1111 | /* Bind Rx socket to exact interface */ | |
1112 | frr_with_privs(&vrrp_privs) { | |
1113 | ret = setsockopt(r->sock_rx, SOL_SOCKET, | |
1114 | SO_BINDTODEVICE, r->vr->ifp->name, | |
1115 | strlen(r->vr->ifp->name)); | |
1116 | } | |
1117 | if (ret) { | |
1118 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1119 | "Failed to bind Rx socket to %s: %s", | |
1120 | r->vr->vrid, family2str(r->family), | |
1121 | r->vr->ifp->name, safe_strerror(errno)); | |
1122 | failed = true; | |
1123 | goto done; | |
1124 | } | |
1125 | DEBUGD(&vrrp_dbg_sock, | |
1126 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1127 | "Bound Rx socket to %s", | |
1128 | r->vr->vrid, family2str(r->family), r->vr->ifp->name); | |
1129 | ||
1130 | /* Bind Rx socket to v4 multicast address */ | |
1131 | struct sockaddr_in sa = {0}; | |
1132 | ||
1133 | sa.sin_family = AF_INET; | |
1134 | sa.sin_addr.s_addr = htonl(VRRP_MCASTV4_GROUP); | |
1135 | if (bind(r->sock_rx, (struct sockaddr *)&sa, sizeof(sa))) { | |
1136 | zlog_err( | |
1137 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1138 | "Failed to bind Rx socket to VRRP multicast group: %s", | |
1139 | r->vr->vrid, family2str(r->family), | |
1140 | safe_strerror(errno)); | |
1141 | failed = true; | |
1142 | goto done; | |
1143 | } | |
1144 | DEBUGD(&vrrp_dbg_sock, | |
1145 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1146 | "Bound Rx socket to VRRP multicast group", | |
1147 | r->vr->vrid, family2str(r->family)); | |
1148 | ||
1149 | /* Join Rx socket to VRRP IPv4 multicast group */ | |
1150 | assert(listhead(r->vr->ifp->connected)); | |
1151 | struct connected *c = listhead(r->vr->ifp->connected)->data; | |
1152 | struct in_addr v4 = c->address->u.prefix4; | |
1153 | ||
1154 | ret = setsockopt_ipv4_multicast(r->sock_rx, IP_ADD_MEMBERSHIP, | |
1155 | v4, htonl(VRRP_MCASTV4_GROUP), | |
1156 | r->vr->ifp->ifindex); | |
1157 | if (ret < 0) { | |
1158 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1159 | "Failed to join VRRP %s multicast group", | |
1160 | r->vr->vrid, family2str(r->family)); | |
1161 | failed = true; | |
1162 | goto done; | |
1163 | } | |
1164 | DEBUGD(&vrrp_dbg_sock, | |
1165 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1166 | "Joined VRRP multicast group", | |
1167 | r->vr->vrid, family2str(r->family)); | |
1168 | ||
1169 | /* Set outgoing interface for advertisements */ | |
1170 | struct ip_mreqn mreqn = {}; | |
1171 | ||
1172 | mreqn.imr_ifindex = r->mvl_ifp->ifindex; | |
1173 | ret = setsockopt(r->sock_tx, IPPROTO_IP, IP_MULTICAST_IF, | |
1174 | (void *)&mreqn, sizeof(mreqn)); | |
1175 | if (ret < 0) { | |
1176 | zlog_warn( | |
1177 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1178 | "Could not set %s as outgoing multicast interface", | |
1179 | r->vr->vrid, family2str(r->family), | |
1180 | r->mvl_ifp->name); | |
1181 | failed = true; | |
1182 | goto done; | |
1183 | } | |
1184 | DEBUGD(&vrrp_dbg_sock, | |
1185 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1186 | "Set %s as outgoing multicast interface", | |
1187 | r->vr->vrid, family2str(r->family), r->mvl_ifp->name); | |
1188 | ||
1189 | /* Select and bind source address */ | |
1190 | if (vrrp_bind_to_primary_connected(r) < 0) { | |
1191 | failed = true; | |
1192 | goto done; | |
1193 | } | |
1194 | ||
1195 | } else if (r->family == AF_INET6) { | |
1196 | /* Always transmit IPv6 packets with hop limit set to 255 */ | |
1197 | ret = setsockopt_ipv6_multicast_hops(r->sock_tx, 255); | |
1198 | if (ret < 0) { | |
1199 | zlog_warn( | |
1200 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1201 | "Failed to set outgoing multicast hop count to 255; RFC 5798 compliant implementations will drop our packets", | |
1202 | r->vr->vrid, family2str(r->family)); | |
1203 | } | |
1204 | ||
1205 | /* Set Tx socket DSCP byte */ | |
1206 | setsockopt_ipv6_tclass(r->sock_tx, IPTOS_PREC_INTERNETCONTROL); | |
1207 | ||
1208 | /* Request hop limit delivery */ | |
1209 | setsockopt_ipv6_hoplimit(r->sock_rx, 1); | |
1210 | if (ret < 0) { | |
1211 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1212 | "Failed to request IPv6 Hop Limit delivery", | |
1213 | r->vr->vrid, family2str(r->family)); | |
1214 | failed = true; | |
1215 | goto done; | |
1216 | } | |
1217 | ||
1218 | /* Turn off multicast loop on Tx */ | |
1219 | setsockopt_ipv6_multicast_loop(r->sock_tx, 0); | |
1220 | ||
1221 | /* Bind Rx socket to exact interface */ | |
1222 | frr_with_privs(&vrrp_privs) { | |
1223 | ret = setsockopt(r->sock_rx, SOL_SOCKET, | |
1224 | SO_BINDTODEVICE, r->vr->ifp->name, | |
1225 | strlen(r->vr->ifp->name)); | |
1226 | } | |
1227 | if (ret) { | |
1228 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1229 | "Failed to bind Rx socket to %s: %s", | |
1230 | r->vr->vrid, family2str(r->family), | |
1231 | r->vr->ifp->name, safe_strerror(errno)); | |
1232 | failed = true; | |
1233 | goto done; | |
1234 | } | |
1235 | DEBUGD(&vrrp_dbg_sock, | |
1236 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1237 | "Bound Rx socket to %s", | |
1238 | r->vr->vrid, family2str(r->family), r->vr->ifp->name); | |
1239 | ||
1240 | /* Bind Rx socket to v6 multicast address */ | |
1241 | struct sockaddr_in6 sa = {0}; | |
1242 | ||
1243 | sa.sin6_family = AF_INET6; | |
1244 | inet_pton(AF_INET6, VRRP_MCASTV6_GROUP_STR, &sa.sin6_addr); | |
1245 | if (bind(r->sock_rx, (struct sockaddr *)&sa, sizeof(sa))) { | |
1246 | zlog_err( | |
1247 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1248 | "Failed to bind Rx socket to VRRP multicast group: %s", | |
1249 | r->vr->vrid, family2str(r->family), | |
1250 | safe_strerror(errno)); | |
1251 | failed = true; | |
1252 | goto done; | |
1253 | } | |
1254 | DEBUGD(&vrrp_dbg_sock, | |
1255 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1256 | "Bound Rx socket to VRRP multicast group", | |
1257 | r->vr->vrid, family2str(r->family)); | |
1258 | ||
1259 | /* Join VRRP IPv6 multicast group */ | |
1260 | struct ipv6_mreq mreq; | |
1261 | ||
1262 | inet_pton(AF_INET6, VRRP_MCASTV6_GROUP_STR, | |
1263 | &mreq.ipv6mr_multiaddr); | |
1264 | mreq.ipv6mr_interface = r->vr->ifp->ifindex; | |
1265 | ret = setsockopt(r->sock_rx, IPPROTO_IPV6, IPV6_JOIN_GROUP, | |
1266 | &mreq, sizeof(mreq)); | |
1267 | if (ret < 0) { | |
1268 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1269 | "Failed to join VRRP multicast group", | |
1270 | r->vr->vrid, family2str(r->family)); | |
1271 | failed = true; | |
1272 | goto done; | |
1273 | } | |
1274 | DEBUGD(&vrrp_dbg_sock, | |
1275 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1276 | "Joined VRRP multicast group", | |
1277 | r->vr->vrid, family2str(r->family)); | |
1278 | ||
1279 | /* Set outgoing interface for advertisements */ | |
1280 | ret = setsockopt(r->sock_tx, IPPROTO_IPV6, IPV6_MULTICAST_IF, | |
1281 | &r->mvl_ifp->ifindex, sizeof(ifindex_t)); | |
1282 | if (ret < 0) { | |
1283 | zlog_warn( | |
1284 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1285 | "Could not set %s as outgoing multicast interface", | |
1286 | r->vr->vrid, family2str(r->family), | |
1287 | r->mvl_ifp->name); | |
1288 | failed = true; | |
1289 | goto done; | |
1290 | } | |
1291 | DEBUGD(&vrrp_dbg_sock, | |
1292 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1293 | "Set %s as outgoing multicast interface", | |
1294 | r->vr->vrid, family2str(r->family), r->mvl_ifp->name); | |
1295 | } | |
1296 | ||
1297 | done: | |
1298 | ret = 0; | |
1299 | if (failed) { | |
1300 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1301 | "Failed to initialize VRRP router", | |
1302 | r->vr->vrid, family2str(r->family)); | |
1303 | if (r->sock_rx >= 0) { | |
1304 | close(r->sock_rx); | |
1305 | r->sock_rx = -1; | |
1306 | } | |
1307 | if (r->sock_tx >= 0) { | |
1308 | close(r->sock_tx); | |
1309 | r->sock_tx = -1; | |
1310 | } | |
1311 | ret = -1; | |
1312 | } | |
1313 | ||
1314 | return ret; | |
1315 | } | |
1316 | ||
1317 | ||
1318 | /* State machine ----------------------------------------------------------- */ | |
1319 | ||
1320 | DEFINE_HOOK(vrrp_change_state_hook, (struct vrrp_router *r, int to), (r, to)); | |
1321 | ||
1322 | /* | |
1323 | * Handle any necessary actions during state change to MASTER state. | |
1324 | * | |
1325 | * r | |
1326 | * VRRP Router to operate on | |
1327 | */ | |
1328 | static void vrrp_change_state_master(struct vrrp_router *r) | |
1329 | { | |
1330 | /* Enable ND Router Advertisements */ | |
1331 | if (r->family == AF_INET6) | |
1332 | vrrp_zebra_radv_set(r, true); | |
1333 | ||
1334 | /* Set protodown off */ | |
1335 | vrrp_zclient_send_interface_protodown(r->mvl_ifp, false); | |
1336 | ||
1337 | /* | |
1338 | * If protodown is already off, we can send our stuff, otherwise we | |
1339 | * have to delay until the interface is all the way up | |
1340 | */ | |
1341 | if (if_is_operative(r->mvl_ifp)) { | |
1342 | vrrp_send_advertisement(r); | |
1343 | ||
1344 | if (r->family == AF_INET) | |
1345 | vrrp_garp_send_all(r); | |
1346 | else if (r->family == AF_INET6) | |
1347 | vrrp_ndisc_una_send_all(r); | |
1348 | } else { | |
1349 | DEBUGD(&vrrp_dbg_proto, | |
1350 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1351 | "Delaying VRRP advertisement until interface is up", | |
1352 | r->vr->vrid, family2str(r->family)); | |
1353 | r->advert_pending = true; | |
1354 | ||
1355 | if (r->family == AF_INET) { | |
1356 | DEBUGD(&vrrp_dbg_proto, | |
1357 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1358 | "Delaying VRRP gratuitous ARPs until interface is up", | |
1359 | r->vr->vrid, family2str(r->family)); | |
1360 | r->garp_pending = true; | |
1361 | } else if (r->family == AF_INET6) { | |
1362 | DEBUGD(&vrrp_dbg_proto, | |
1363 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1364 | "Delaying VRRP unsolicited neighbor advertisement until interface is up", | |
1365 | r->vr->vrid, family2str(r->family)); | |
1366 | r->ndisc_pending = true; | |
1367 | } | |
1368 | } | |
1369 | } | |
1370 | ||
1371 | /* | |
1372 | * Handle any necessary actions during state change to BACKUP state. | |
1373 | * | |
1374 | * r | |
1375 | * Virtual Router to operate on | |
1376 | */ | |
1377 | static void vrrp_change_state_backup(struct vrrp_router *r) | |
1378 | { | |
1379 | /* Disable ND Router Advertisements */ | |
1380 | if (r->family == AF_INET6) | |
1381 | vrrp_zebra_radv_set(r, false); | |
1382 | ||
1383 | /* Disable Adver_Timer */ | |
1384 | THREAD_OFF(r->t_adver_timer); | |
1385 | ||
1386 | r->advert_pending = false; | |
1387 | r->garp_pending = false; | |
1388 | r->ndisc_pending = false; | |
1389 | memset(&r->src, 0x00, sizeof(r->src)); | |
1390 | ||
1391 | vrrp_zclient_send_interface_protodown(r->mvl_ifp, true); | |
1392 | } | |
1393 | ||
1394 | /* | |
1395 | * Handle any necessary actions during state change to INITIALIZE state. | |
1396 | * | |
1397 | * This is not called for initial startup, only when transitioning from MASTER | |
1398 | * or BACKUP. | |
1399 | * | |
1400 | * r | |
1401 | * VRRP Router to operate on | |
1402 | */ | |
1403 | static void vrrp_change_state_initialize(struct vrrp_router *r) | |
1404 | { | |
1405 | r->master_adver_interval = 0; | |
1406 | vrrp_recalculate_timers(r); | |
1407 | ||
1408 | r->advert_pending = false; | |
1409 | r->garp_pending = false; | |
1410 | r->ndisc_pending = false; | |
1411 | ||
1412 | /* Disable ND Router Advertisements */ | |
1413 | if (r->family == AF_INET6) | |
1414 | vrrp_zebra_radv_set(r, false); | |
1415 | } | |
1416 | ||
1417 | void (*vrrp_change_state_handlers[])(struct vrrp_router *vr) = { | |
1418 | [VRRP_STATE_MASTER] = vrrp_change_state_master, | |
1419 | [VRRP_STATE_BACKUP] = vrrp_change_state_backup, | |
1420 | [VRRP_STATE_INITIALIZE] = vrrp_change_state_initialize, | |
1421 | }; | |
1422 | ||
1423 | /* | |
1424 | * Change Virtual Router FSM position. Handles transitional actions and calls | |
1425 | * any subscribers to the state change hook. | |
1426 | * | |
1427 | * r | |
1428 | * Virtual Router for which to change state | |
1429 | * | |
1430 | * to | |
1431 | * State to change to | |
1432 | */ | |
1433 | static void vrrp_change_state(struct vrrp_router *r, int to) | |
1434 | { | |
1435 | if (r->fsm.state == to) | |
1436 | return; | |
1437 | ||
1438 | /* Call our handlers, then any subscribers */ | |
1439 | vrrp_change_state_handlers[to](r); | |
1440 | hook_call(vrrp_change_state_hook, r, to); | |
1441 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM "%s -> %s", | |
1442 | r->vr->vrid, family2str(r->family), | |
1443 | vrrp_state_names[r->fsm.state], vrrp_state_names[to]); | |
1444 | r->fsm.state = to; | |
1445 | ||
1446 | ++r->stats.trans_cnt; | |
1447 | } | |
1448 | ||
1449 | /* | |
1450 | * Called when Adver_Timer expires. | |
1451 | */ | |
1452 | static int vrrp_adver_timer_expire(struct thread *thread) | |
1453 | { | |
1454 | struct vrrp_router *r = thread->arg; | |
1455 | ||
1456 | DEBUGD(&vrrp_dbg_proto, | |
1457 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1458 | "Adver_Timer expired", | |
1459 | r->vr->vrid, family2str(r->family)); | |
1460 | ||
1461 | if (r->fsm.state == VRRP_STATE_MASTER) { | |
1462 | /* Send an ADVERTISEMENT */ | |
1463 | vrrp_send_advertisement(r); | |
1464 | ||
1465 | /* Reset the Adver_Timer to Advertisement_Interval */ | |
1466 | thread_add_timer_msec(master, vrrp_adver_timer_expire, r, | |
1467 | r->vr->advertisement_interval * CS2MS, | |
1468 | &r->t_adver_timer); | |
1469 | } else { | |
1470 | zlog_err(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1471 | "Adver_Timer expired in state '%s'; this is a bug", | |
1472 | r->vr->vrid, family2str(r->family), | |
1473 | vrrp_state_names[r->fsm.state]); | |
1474 | } | |
1475 | ||
1476 | return 0; | |
1477 | } | |
1478 | ||
1479 | /* | |
1480 | * Called when Master_Down_Timer expires. | |
1481 | */ | |
1482 | static int vrrp_master_down_timer_expire(struct thread *thread) | |
1483 | { | |
1484 | struct vrrp_router *r = thread->arg; | |
1485 | ||
1486 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1487 | "Master_Down_Timer expired", | |
1488 | r->vr->vrid, family2str(r->family)); | |
1489 | ||
1490 | thread_add_timer_msec(master, vrrp_adver_timer_expire, r, | |
1491 | r->vr->advertisement_interval * CS2MS, | |
1492 | &r->t_adver_timer); | |
1493 | vrrp_change_state(r, VRRP_STATE_MASTER); | |
1494 | ||
1495 | return 0; | |
1496 | } | |
1497 | ||
1498 | /* | |
1499 | * Event handler for Startup event. | |
1500 | * | |
1501 | * Creates sockets, sends advertisements and ARP requests, starts timers, | |
1502 | * and transitions the Virtual Router to either Master or Backup states. | |
1503 | * | |
1504 | * This function will also initialize the program's global ARP subsystem if it | |
1505 | * has not yet been initialized. | |
1506 | * | |
1507 | * r | |
1508 | * VRRP Router on which to apply Startup event | |
1509 | * | |
1510 | * Returns: | |
1511 | * < 0 if the session socket could not be created, or the state is not | |
1512 | * Initialize | |
1513 | * 0 on success | |
1514 | */ | |
1515 | static int vrrp_startup(struct vrrp_router *r) | |
1516 | { | |
1517 | /* May only be called when the state is Initialize */ | |
1518 | if (r->fsm.state != VRRP_STATE_INITIALIZE) | |
1519 | return -1; | |
1520 | ||
1521 | /* Must have a valid macvlan interface available */ | |
1522 | if (r->mvl_ifp == NULL && !vrrp_attach_interface(r)) { | |
1523 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1524 | "No appropriate interface found", | |
1525 | r->vr->vrid, family2str(r->family)); | |
1526 | return -1; | |
1527 | } | |
1528 | ||
1529 | /* Initialize global gratuitous ARP socket if necessary */ | |
1530 | if (r->family == AF_INET && !vrrp_garp_is_init()) | |
1531 | vrrp_garp_init(); | |
1532 | if (r->family == AF_INET6 && !vrrp_ndisc_is_init()) | |
1533 | vrrp_ndisc_init(); | |
1534 | ||
1535 | /* Create socket */ | |
1536 | if (r->sock_rx < 0 || r->sock_tx < 0) { | |
1537 | int ret = vrrp_socket(r); | |
1538 | ||
1539 | if (ret < 0 || r->sock_tx < 0 || r->sock_rx < 0) | |
1540 | return ret; | |
1541 | } | |
1542 | ||
1543 | /* Schedule listener */ | |
1544 | thread_add_read(master, vrrp_read, r, r->sock_rx, &r->t_read); | |
1545 | ||
1546 | /* Configure effective priority */ | |
1547 | assert(listhead(r->addrs)); | |
1548 | struct ipaddr *primary = (struct ipaddr *)listhead(r->addrs)->data; | |
1549 | char ipbuf[INET6_ADDRSTRLEN]; | |
1550 | ||
1551 | inet_ntop(r->family, &primary->ip.addr, ipbuf, sizeof(ipbuf)); | |
1552 | ||
1553 | if (r->vr->priority == VRRP_PRIO_MASTER | |
1554 | || vrrp_is_owner(r->vr->ifp, primary)) { | |
1555 | r->priority = VRRP_PRIO_MASTER; | |
1556 | vrrp_recalculate_timers(r); | |
1557 | ||
1558 | zlog_info( | |
1559 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1560 | "%s has priority set to 255 or owns primary Virtual Router IP %s; electing self as Master", | |
1561 | r->vr->vrid, family2str(r->family), r->vr->ifp->name, | |
1562 | ipbuf); | |
1563 | } | |
1564 | ||
1565 | if (r->priority == VRRP_PRIO_MASTER) { | |
1566 | thread_add_timer_msec(master, vrrp_adver_timer_expire, r, | |
1567 | r->vr->advertisement_interval * CS2MS, | |
1568 | &r->t_adver_timer); | |
1569 | vrrp_change_state(r, VRRP_STATE_MASTER); | |
1570 | } else { | |
1571 | r->master_adver_interval = r->vr->advertisement_interval; | |
1572 | vrrp_recalculate_timers(r); | |
1573 | thread_add_timer_msec(master, vrrp_master_down_timer_expire, r, | |
1574 | r->master_down_interval * CS2MS, | |
1575 | &r->t_master_down_timer); | |
1576 | vrrp_change_state(r, VRRP_STATE_BACKUP); | |
1577 | } | |
1578 | ||
1579 | r->is_active = true; | |
1580 | ||
1581 | return 0; | |
1582 | } | |
1583 | ||
1584 | /* | |
1585 | * Shuts down a Virtual Router and transitions it to Initialize. | |
1586 | * | |
1587 | * This call must be idempotent; it is safe to call multiple times on the same | |
1588 | * VRRP Router. | |
1589 | */ | |
1590 | static int vrrp_shutdown(struct vrrp_router *r) | |
1591 | { | |
1592 | uint8_t saved_prio; | |
1593 | ||
1594 | switch (r->fsm.state) { | |
1595 | case VRRP_STATE_MASTER: | |
1596 | /* Send an ADVERTISEMENT with Priority = 0 */ | |
1597 | saved_prio = r->priority; | |
1598 | r->priority = 0; | |
1599 | vrrp_send_advertisement(r); | |
1600 | r->priority = saved_prio; | |
1601 | break; | |
1602 | case VRRP_STATE_BACKUP: | |
1603 | break; | |
1604 | case VRRP_STATE_INITIALIZE: | |
1605 | DEBUGD(&vrrp_dbg_proto, | |
1606 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1607 | "Received '%s' event in '%s' state; ignoring", | |
1608 | r->vr->vrid, family2str(r->family), | |
1609 | vrrp_event_names[VRRP_EVENT_SHUTDOWN], | |
1610 | vrrp_state_names[VRRP_STATE_INITIALIZE]); | |
1611 | break; | |
1612 | } | |
1613 | ||
1614 | /* Cancel all timers */ | |
1615 | THREAD_OFF(r->t_adver_timer); | |
1616 | THREAD_OFF(r->t_master_down_timer); | |
1617 | THREAD_OFF(r->t_read); | |
1618 | THREAD_OFF(r->t_write); | |
1619 | ||
1620 | /* Protodown macvlan */ | |
1621 | vrrp_zclient_send_interface_protodown(r->mvl_ifp, true); | |
1622 | ||
1623 | /* Throw away our source address */ | |
1624 | memset(&r->src, 0x00, sizeof(r->src)); | |
1625 | ||
1626 | if (r->sock_rx > 0) { | |
1627 | close(r->sock_rx); | |
1628 | r->sock_rx = -1; | |
1629 | } | |
1630 | if (r->sock_tx > 0) { | |
1631 | close(r->sock_tx); | |
1632 | r->sock_tx = -1; | |
1633 | } | |
1634 | ||
1635 | vrrp_change_state(r, VRRP_STATE_INITIALIZE); | |
1636 | ||
1637 | r->is_active = false; | |
1638 | ||
1639 | return 0; | |
1640 | } | |
1641 | ||
1642 | static int (*vrrp_event_handlers[])(struct vrrp_router *r) = { | |
1643 | [VRRP_EVENT_STARTUP] = vrrp_startup, | |
1644 | [VRRP_EVENT_SHUTDOWN] = vrrp_shutdown, | |
1645 | }; | |
1646 | ||
1647 | /* | |
1648 | * Spawn a VRRP FSM event on a VRRP Router. | |
1649 | * | |
1650 | * vr | |
1651 | * VRRP Router on which to spawn event | |
1652 | * | |
1653 | * event | |
1654 | * The event to spawn | |
1655 | * | |
1656 | * Returns: | |
1657 | * -1 on failure | |
1658 | * 0 otherwise | |
1659 | */ | |
1660 | int vrrp_event(struct vrrp_router *r, int event) | |
1661 | { | |
1662 | zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM "'%s' event", | |
1663 | r->vr->vrid, family2str(r->family), vrrp_event_names[event]); | |
1664 | return vrrp_event_handlers[event](r); | |
1665 | } | |
1666 | ||
1667 | ||
1668 | /* Autoconfig -------------------------------------------------------------- */ | |
1669 | ||
1670 | /* | |
1671 | * Set the configured addresses for this VRRP instance to exactly the addresses | |
1672 | * present on its macvlan subinterface(s). | |
1673 | * | |
1674 | * vr | |
1675 | * VRRP router to act on | |
1676 | */ | |
1677 | static void vrrp_autoconfig_autoaddrupdate(struct vrrp_router *r) | |
1678 | { | |
1679 | struct listnode *ln; | |
1680 | struct connected *c = NULL; | |
1681 | bool is_v6_ll; | |
1682 | char ipbuf[INET6_ADDRSTRLEN]; | |
1683 | ||
1684 | if (!r->mvl_ifp) | |
1685 | return; | |
1686 | ||
1687 | DEBUGD(&vrrp_dbg_auto, | |
1688 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1689 | "Setting Virtual IP list to match IPv4 addresses on %s", | |
1690 | r->vr->vrid, family2str(r->family), r->mvl_ifp->name); | |
1691 | for (ALL_LIST_ELEMENTS_RO(r->mvl_ifp->connected, ln, c)) { | |
1692 | is_v6_ll = (c->address->family == AF_INET6 | |
1693 | && IN6_IS_ADDR_LINKLOCAL(&c->address->u.prefix6)); | |
1694 | if (c->address->family == r->family && !is_v6_ll) { | |
1695 | inet_ntop(r->family, &c->address->u.prefix, ipbuf, | |
1696 | sizeof(ipbuf)); | |
1697 | DEBUGD(&vrrp_dbg_auto, | |
1698 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1699 | "Adding %s", | |
1700 | r->vr->vrid, family2str(r->family), ipbuf); | |
1701 | if (r->family == AF_INET) | |
1702 | vrrp_add_ipv4(r->vr, c->address->u.prefix4); | |
1703 | else if (r->vr->version == 3) | |
1704 | vrrp_add_ipv6(r->vr, c->address->u.prefix6); | |
1705 | } | |
1706 | } | |
1707 | ||
1708 | vrrp_check_start(r->vr); | |
1709 | ||
1710 | if (r->addrs->count == 0 && r->fsm.state != VRRP_STATE_INITIALIZE) { | |
1711 | DEBUGD(&vrrp_dbg_auto, | |
1712 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1713 | "Virtual IP list is empty; shutting down", | |
1714 | r->vr->vrid, family2str(r->family)); | |
1715 | vrrp_event(r, VRRP_EVENT_SHUTDOWN); | |
1716 | } | |
1717 | } | |
1718 | ||
1719 | static struct vrrp_vrouter * | |
1720 | vrrp_autoconfig_autocreate(struct interface *mvl_ifp) | |
1721 | { | |
1722 | struct interface *p; | |
1723 | struct vrrp_vrouter *vr; | |
1724 | ||
1725 | p = if_lookup_by_index(mvl_ifp->link_ifindex, VRF_DEFAULT); | |
1726 | ||
1727 | if (!p) | |
1728 | return NULL; | |
1729 | ||
1730 | uint8_t vrid = mvl_ifp->hw_addr[5]; | |
1731 | uint8_t fam = mvl_ifp->hw_addr[4]; | |
1732 | ||
1733 | DEBUGD(&vrrp_dbg_auto, | |
1734 | VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1735 | "Autoconfiguring VRRP on %s", | |
1736 | vrid, family2str(fam), p->name); | |
1737 | ||
1738 | vr = vrrp_vrouter_create(p, vrid, vrrp_autoconfig_version); | |
1739 | ||
1740 | if (!vr) { | |
1741 | zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM | |
1742 | "Failed to autoconfigure VRRP on %s", | |
1743 | vrid, family2str(fam), p->name); | |
1744 | return NULL; | |
1745 | } | |
1746 | ||
1747 | vr->autoconf = true; | |
1748 | ||
1749 | /* | |
1750 | * If these interfaces are protodown on, we need to un-protodown them | |
1751 | * in order to get Zebra to send us their addresses so we can | |
1752 | * autoconfigure them. | |
1753 | */ | |
1754 | if (vr->v4->mvl_ifp) | |
1755 | vrrp_zclient_send_interface_protodown(vr->v4->mvl_ifp, false); | |
1756 | if (vr->v6->mvl_ifp) | |
1757 | vrrp_zclient_send_interface_protodown(vr->v6->mvl_ifp, false); | |
1758 | ||
1759 | /* If they're not, we can go ahead and add the addresses we have */ | |
1760 | vrrp_autoconfig_autoaddrupdate(vr->v4); | |
1761 | vrrp_autoconfig_autoaddrupdate(vr->v6); | |
1762 | ||
1763 | return vr; | |
1764 | } | |
1765 | ||
1766 | /* | |
1767 | * Callback to notify autoconfig of interface add. | |
1768 | * | |
1769 | * If the interface is a VRRP-compatible device, and there is no existing VRRP | |
1770 | * router running on it, one is created. All addresses on the interface are | |
1771 | * added to the router. | |
1772 | * | |
1773 | * ifp | |
1774 | * Interface to operate on | |
1775 | * | |
1776 | * Returns: | |
1777 | * -1 on failure | |
1778 | * 0 otherwise | |
1779 | */ | |
1780 | static int vrrp_autoconfig_if_add(struct interface *ifp) | |
1781 | { | |
1782 | bool created = false; | |
1783 | struct vrrp_vrouter *vr; | |
1784 | ||
1785 | if (!vrrp_autoconfig_is_on) | |
1786 | return 0; | |
1787 | ||
1788 | if (!ifp || !ifp->link_ifindex || !vrrp_ifp_has_vrrp_mac(ifp)) | |
1789 | return -1; | |
1790 | ||
1791 | vr = vrrp_lookup_by_if_mvl(ifp); | |
1792 | ||
1793 | if (!vr) { | |
1794 | vr = vrrp_autoconfig_autocreate(ifp); | |
1795 | created = true; | |
1796 | } | |
1797 | ||
1798 | if (!vr || vr->autoconf == false) | |
1799 | return 0; | |
1800 | ||
1801 | if (!created) { | |
1802 | /* | |
1803 | * We didn't create it, but it has already been autoconfigured. | |
1804 | * Try to attach this interface to the existing instance. | |
1805 | */ | |
1806 | if (!vr->v4->mvl_ifp) { | |
1807 | vrrp_attach_interface(vr->v4); | |
1808 | /* If we just attached it, make sure it's turned on */ | |
1809 | if (vr->v4->mvl_ifp) { | |
1810 | vrrp_zclient_send_interface_protodown( | |
1811 | vr->v4->mvl_ifp, false); | |
1812 | /* | |
1813 | * If it's already up, we can go ahead and add | |
1814 | * the addresses we have | |
1815 | */ | |
1816 | vrrp_autoconfig_autoaddrupdate(vr->v4); | |
1817 | } | |
1818 | } | |
1819 | if (!vr->v6->mvl_ifp) { | |
1820 | vrrp_attach_interface(vr->v6); | |
1821 | /* If we just attached it, make sure it's turned on */ | |
1822 | if (vr->v6->mvl_ifp) { | |
1823 | vrrp_zclient_send_interface_protodown( | |
1824 | vr->v6->mvl_ifp, false); | |
1825 | /* | |
1826 | * If it's already up, we can go ahead and add | |
1827 | * the addresses we have | |
1828 | */ | |
1829 | vrrp_autoconfig_autoaddrupdate(vr->v6); | |
1830 | } | |
1831 | } | |
1832 | } | |
1833 | ||
1834 | return 0; | |
1835 | } | |
1836 | ||
1837 | /* | |
1838 | * Callback to notify autoconfig of interface delete. | |
1839 | * | |
1840 | * If the interface is a VRRP-compatible device, and a VRRP router is running | |
1841 | * on it, and that VRRP router was automatically configured, it will be | |
1842 | * deleted. If that was the last router for the corresponding VRID (i.e., if | |
1843 | * this interface was a v4 VRRP interface and no v6 router is configured for | |
1844 | * the same VRID) then the entire virtual router is deleted. | |
1845 | * | |
1846 | * ifp | |
1847 | * Interface to operate on | |
1848 | * | |
1849 | * Returns: | |
1850 | * -1 on failure | |
1851 | * 0 otherwise | |
1852 | */ | |
1853 | static int vrrp_autoconfig_if_del(struct interface *ifp) | |
1854 | { | |
1855 | if (!vrrp_autoconfig_is_on) | |
1856 | return 0; | |
1857 | ||
1858 | struct vrrp_vrouter *vr; | |
1859 | struct listnode *ln; | |
1860 | struct list *vrs; | |
1861 | ||
1862 | vrs = vrrp_lookup_by_if_any(ifp); | |
1863 | ||
1864 | for (ALL_LIST_ELEMENTS_RO(vrs, ln, vr)) | |
1865 | if (vr->autoconf | |
1866 | && (!vr->ifp || (!vr->v4->mvl_ifp && !vr->v6->mvl_ifp))) { | |
1867 | DEBUGD(&vrrp_dbg_auto, | |
1868 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
1869 | "All VRRP interfaces for instance deleted; destroying autoconfigured VRRP router", | |
1870 | vr->vrid); | |
1871 | vrrp_vrouter_destroy(vr); | |
1872 | } | |
1873 | ||
1874 | list_delete(&vrs); | |
1875 | ||
1876 | return 0; | |
1877 | } | |
1878 | ||
1879 | /* | |
1880 | * Callback to notify autoconfig of interface up. | |
1881 | * | |
1882 | * Creates VRRP instance on interface if it does not exist. Otherwise does | |
1883 | * nothing. | |
1884 | * | |
1885 | * ifp | |
1886 | * Interface to operate on | |
1887 | * | |
1888 | * Returns: | |
1889 | * -1 on failure | |
1890 | * 0 otherwise | |
1891 | */ | |
1892 | static int vrrp_autoconfig_if_up(struct interface *ifp) | |
1893 | { | |
1894 | if (!vrrp_autoconfig_is_on) | |
1895 | return 0; | |
1896 | ||
1897 | struct vrrp_vrouter *vr = vrrp_lookup_by_if_mvl(ifp); | |
1898 | ||
1899 | if (vr && !vr->autoconf) | |
1900 | return 0; | |
1901 | ||
1902 | if (!vr) { | |
1903 | vrrp_autoconfig_if_add(ifp); | |
1904 | return 0; | |
1905 | } | |
1906 | ||
1907 | return 0; | |
1908 | } | |
1909 | ||
1910 | /* | |
1911 | * Callback to notify autoconfig of interface down. | |
1912 | * | |
1913 | * Does nothing. An interface down event is accompanied by address deletion | |
1914 | * events for all the addresses on the interface; if an autoconfigured VRRP | |
1915 | * router exists on this interface, then it will have all its addresses deleted | |
1916 | * and end up in Initialize. | |
1917 | * | |
1918 | * ifp | |
1919 | * Interface to operate on | |
1920 | * | |
1921 | * Returns: | |
1922 | * -1 on failure | |
1923 | * 0 otherwise | |
1924 | */ | |
1925 | static int vrrp_autoconfig_if_down(struct interface *ifp) | |
1926 | { | |
1927 | if (!vrrp_autoconfig_is_on) | |
1928 | return 0; | |
1929 | ||
1930 | return 0; | |
1931 | } | |
1932 | ||
1933 | /* | |
1934 | * Callback to notify autoconfig of a new interface address. | |
1935 | * | |
1936 | * If a VRRP router exists on this interface, its address list is updated to | |
1937 | * match the new address list. If no addresses remain, a Shutdown event is | |
1938 | * issued to the VRRP router. | |
1939 | * | |
1940 | * ifp | |
1941 | * Interface to operate on | |
1942 | * | |
1943 | * Returns: | |
1944 | * -1 on failure | |
1945 | * 0 otherwise | |
1946 | * | |
1947 | */ | |
1948 | static int vrrp_autoconfig_if_address_add(struct interface *ifp) | |
1949 | { | |
1950 | if (!vrrp_autoconfig_is_on) | |
1951 | return 0; | |
1952 | ||
1953 | struct vrrp_vrouter *vr = vrrp_lookup_by_if_mvl(ifp); | |
1954 | ||
1955 | if (vr && vr->autoconf) { | |
1956 | if (vr->v4->mvl_ifp == ifp) | |
1957 | vrrp_autoconfig_autoaddrupdate(vr->v4); | |
1958 | else if (vr->v6->mvl_ifp == ifp) | |
1959 | vrrp_autoconfig_autoaddrupdate(vr->v6); | |
1960 | } | |
1961 | ||
1962 | return 0; | |
1963 | } | |
1964 | ||
1965 | /* | |
1966 | * Callback to notify autoconfig of a removed interface address. | |
1967 | * | |
1968 | * If a VRRP router exists on this interface, its address list is updated to | |
1969 | * match the new address list. If no addresses remain, a Shutdown event is | |
1970 | * issued to the VRRP router. | |
1971 | * | |
1972 | * ifp | |
1973 | * Interface to operate on | |
1974 | * | |
1975 | * Returns: | |
1976 | * -1 on failure | |
1977 | * 0 otherwise | |
1978 | * | |
1979 | */ | |
1980 | static int vrrp_autoconfig_if_address_del(struct interface *ifp) | |
1981 | { | |
1982 | if (!vrrp_autoconfig_is_on) | |
1983 | return 0; | |
1984 | ||
1985 | struct vrrp_vrouter *vr = vrrp_lookup_by_if_mvl(ifp); | |
1986 | ||
1987 | if (vr && vr->autoconf) { | |
1988 | if (vr->v4->mvl_ifp == ifp) | |
1989 | vrrp_autoconfig_autoaddrupdate(vr->v4); | |
1990 | else if (vr->v6->mvl_ifp == ifp) | |
1991 | vrrp_autoconfig_autoaddrupdate(vr->v6); | |
1992 | } | |
1993 | ||
1994 | return 0; | |
1995 | } | |
1996 | ||
1997 | int vrrp_autoconfig(void) | |
1998 | { | |
1999 | if (!vrrp_autoconfig_is_on) | |
2000 | return 0; | |
2001 | ||
2002 | struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT); | |
2003 | struct interface *ifp; | |
2004 | ||
2005 | FOR_ALL_INTERFACES (vrf, ifp) | |
2006 | vrrp_autoconfig_if_add(ifp); | |
2007 | ||
2008 | return 0; | |
2009 | } | |
2010 | ||
2011 | void vrrp_autoconfig_on(int version) | |
2012 | { | |
2013 | vrrp_autoconfig_is_on = true; | |
2014 | vrrp_autoconfig_version = version; | |
2015 | ||
2016 | vrrp_autoconfig(); | |
2017 | } | |
2018 | ||
2019 | void vrrp_autoconfig_off(void) | |
2020 | { | |
2021 | vrrp_autoconfig_is_on = false; | |
2022 | ||
2023 | struct list *ll = hash_to_list(vrrp_vrouters_hash); | |
2024 | ||
2025 | struct listnode *ln; | |
2026 | struct vrrp_vrouter *vr; | |
2027 | ||
2028 | for (ALL_LIST_ELEMENTS_RO(ll, ln, vr)) | |
2029 | if (vr->autoconf) | |
2030 | vrrp_vrouter_destroy(vr); | |
2031 | ||
2032 | list_delete(&ll); | |
2033 | } | |
2034 | ||
2035 | /* Interface tracking ------------------------------------------------------ */ | |
2036 | ||
2037 | /* | |
2038 | * Bind any pending interfaces. | |
2039 | * | |
2040 | * mvl_ifp | |
2041 | * macvlan interface that some VRRP instances might want to bind to | |
2042 | */ | |
2043 | static void vrrp_bind_pending(struct interface *mvl_ifp) | |
2044 | { | |
2045 | struct vrrp_vrouter *vr; | |
2046 | ||
2047 | DEBUGD(&vrrp_dbg_zebra, | |
2048 | VRRP_LOGPFX | |
2049 | "Searching for instances that could use interface %s", | |
2050 | mvl_ifp->name); | |
2051 | ||
2052 | vr = vrrp_lookup_by_if_mvl(mvl_ifp); | |
2053 | ||
2054 | if (vr) { | |
2055 | DEBUGD(&vrrp_dbg_zebra, | |
2056 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
2057 | "<-- This instance can probably use interface %s", | |
2058 | vr->vrid, mvl_ifp->name); | |
2059 | ||
2060 | if (mvl_ifp->hw_addr[4] == 0x01 && !vr->v4->mvl_ifp) | |
2061 | vrrp_attach_interface(vr->v4); | |
2062 | else if (mvl_ifp->hw_addr[4] == 0x02 && !vr->v6->mvl_ifp) | |
2063 | vrrp_attach_interface(vr->v6); | |
2064 | } | |
2065 | } | |
2066 | ||
2067 | void vrrp_if_up(struct interface *ifp) | |
2068 | { | |
2069 | struct vrrp_vrouter *vr; | |
2070 | struct listnode *ln; | |
2071 | struct list *vrs; | |
2072 | ||
2073 | vrrp_bind_pending(ifp); | |
2074 | ||
2075 | vrs = vrrp_lookup_by_if_any(ifp); | |
2076 | ||
2077 | for (ALL_LIST_ELEMENTS_RO(vrs, ln, vr)) { | |
2078 | vrrp_check_start(vr); | |
2079 | ||
2080 | if (!if_is_operative(ifp)) | |
2081 | continue; | |
2082 | ||
2083 | /* | |
2084 | * Handle the situation in which we performed a state | |
2085 | * transition on this VRRP router but needed to wait for the | |
2086 | * macvlan interface to come up to perform some actions | |
2087 | */ | |
2088 | if (ifp == vr->v4->mvl_ifp) { | |
2089 | if (vr->v4->advert_pending) { | |
2090 | DEBUGD(&vrrp_dbg_proto, | |
2091 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
2092 | VRRP_LOGPFX_FAM | |
2093 | "Interface up; sending pending advertisement", | |
2094 | vr->vrid, family2str(vr->v4->family)); | |
2095 | vrrp_send_advertisement(vr->v4); | |
2096 | vr->v4->advert_pending = false; | |
2097 | } | |
2098 | if (vr->v4->garp_pending) { | |
2099 | DEBUGD(&vrrp_dbg_proto, | |
2100 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
2101 | VRRP_LOGPFX_FAM | |
2102 | "Interface up; sending pending gratuitous ARP", | |
2103 | vr->vrid, family2str(vr->v4->family)); | |
2104 | vrrp_garp_send_all(vr->v4); | |
2105 | vr->v4->garp_pending = false; | |
2106 | } | |
2107 | } | |
2108 | if (ifp == vr->v6->mvl_ifp) { | |
2109 | if (vr->v6->advert_pending) { | |
2110 | DEBUGD(&vrrp_dbg_proto, | |
2111 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
2112 | VRRP_LOGPFX_FAM | |
2113 | "Interface up; sending pending advertisement", | |
2114 | vr->vrid, family2str(vr->v6->family)); | |
2115 | vrrp_send_advertisement(vr->v6); | |
2116 | vr->v6->advert_pending = false; | |
2117 | } | |
2118 | if (vr->v6->ndisc_pending) { | |
2119 | DEBUGD(&vrrp_dbg_proto, | |
2120 | VRRP_LOGPFX VRRP_LOGPFX_VRID | |
2121 | VRRP_LOGPFX_FAM | |
2122 | "Interface up; sending pending Unsolicited Neighbor Advertisement", | |
2123 | vr->vrid, family2str(vr->v6->family)); | |
2124 | vrrp_ndisc_una_send_all(vr->v6); | |
2125 | vr->v6->ndisc_pending = false; | |
2126 | } | |
2127 | } | |
2128 | } | |
2129 | ||
2130 | list_delete(&vrs); | |
2131 | ||
2132 | vrrp_autoconfig_if_up(ifp); | |
2133 | } | |
2134 | ||
2135 | void vrrp_if_down(struct interface *ifp) | |
2136 | { | |
2137 | struct vrrp_vrouter *vr; | |
2138 | struct listnode *ln; | |
2139 | struct list *vrs; | |
2140 | ||
2141 | vrrp_bind_pending(ifp); | |
2142 | ||
2143 | vrs = vrrp_lookup_by_if_any(ifp); | |
2144 | ||
2145 | for (ALL_LIST_ELEMENTS_RO(vrs, ln, vr)) { | |
2146 | vrrp_check_start(vr); | |
2147 | ||
2148 | if (vr->ifp == ifp || vr->v4->mvl_ifp == ifp | |
2149 | || vr->v6->mvl_ifp == ifp) { | |
2150 | DEBUGD(&vrrp_dbg_auto, | |
2151 | VRRP_LOGPFX VRRP_LOGPFX_VRID "Interface %s down", | |
2152 | vr->vrid, ifp->name); | |
2153 | } | |
2154 | } | |
2155 | ||
2156 | list_delete(&vrs); | |
2157 | ||
2158 | vrrp_autoconfig_if_down(ifp); | |
2159 | } | |
2160 | ||
2161 | void vrrp_if_add(struct interface *ifp) | |
2162 | { | |
2163 | vrrp_bind_pending(ifp); | |
2164 | ||
2165 | /* thanks, zebra */ | |
2166 | if (CHECK_FLAG(ifp->flags, IFF_UP)) | |
2167 | vrrp_if_up(ifp); | |
2168 | ||
2169 | vrrp_autoconfig_if_add(ifp); | |
2170 | } | |
2171 | ||
2172 | void vrrp_if_del(struct interface *ifp) | |
2173 | { | |
2174 | struct listnode *ln; | |
2175 | struct vrrp_vrouter *vr; | |
2176 | struct list *vrs = vrrp_lookup_by_if_any(ifp); | |
2177 | ||
2178 | vrrp_if_down(ifp); | |
2179 | ||
2180 | for (ALL_LIST_ELEMENTS_RO(vrs, ln, vr)) { | |
2181 | if ((vr->v4->mvl_ifp == ifp || vr->ifp == ifp) | |
2182 | && vr->v4->fsm.state != VRRP_STATE_INITIALIZE) { | |
2183 | vrrp_event(vr->v4, VRRP_EVENT_SHUTDOWN); | |
2184 | vr->v4->mvl_ifp = NULL; | |
2185 | } else if ((vr->v6->mvl_ifp == ifp || vr->ifp == ifp) | |
2186 | && vr->v6->fsm.state != VRRP_STATE_INITIALIZE) { | |
2187 | vrrp_event(vr->v6, VRRP_EVENT_SHUTDOWN); | |
2188 | vr->v6->mvl_ifp = NULL; | |
2189 | } | |
2190 | } | |
2191 | ||
2192 | list_delete(&vrs); | |
2193 | ||
2194 | vrrp_autoconfig_if_del(ifp); | |
2195 | } | |
2196 | ||
2197 | void vrrp_if_address_add(struct interface *ifp) | |
2198 | { | |
2199 | struct vrrp_vrouter *vr; | |
2200 | struct listnode *ln; | |
2201 | struct list *vrs; | |
2202 | ||
2203 | /* | |
2204 | * We have to do a wide search here, because we need to know when a v6 | |
2205 | * macvlan device gets a new address. This is because the macvlan link | |
2206 | * local is used as the source address for v6 advertisements, and hence | |
2207 | * "do I have a link local" constitutes an activation condition for v6 | |
2208 | * virtual routers. | |
2209 | */ | |
2210 | vrs = vrrp_lookup_by_if_any(ifp); | |
2211 | ||
2212 | for (ALL_LIST_ELEMENTS_RO(vrs, ln, vr)) | |
2213 | vrrp_check_start(vr); | |
2214 | ||
2215 | list_delete(&vrs); | |
2216 | ||
2217 | vrrp_autoconfig_if_address_add(ifp); | |
2218 | } | |
2219 | ||
2220 | void vrrp_if_address_del(struct interface *ifp) | |
2221 | { | |
2222 | /* | |
2223 | * Zebra is stupid and sends us address deletion notifications | |
2224 | * when any of the following condition sets are met: | |
2225 | * | |
2226 | * - if_is_operative && address deleted | |
2227 | * - if_is_operative -> !if_is_operative | |
2228 | * | |
2229 | * Note that the second one is nonsense, because Zebra behaves as | |
2230 | * though an interface going down means all the addresses on that | |
2231 | * interface got deleted. Which is a problem for autoconfig because all | |
2232 | * the addresses on an interface going away means the VRRP session goes | |
2233 | * to Initialize. However interfaces go down whenever we transition to | |
2234 | * Backup, so this effectively means that for autoconfigured instances | |
2235 | * we actually end up in Initialize whenever we try to go into Backup. | |
2236 | * | |
2237 | * Also, Zebra does NOT send us notifications when: | |
2238 | * - !if_is_operative && address deleted | |
2239 | * | |
2240 | * Which means if we're in backup and an address is deleted out from | |
2241 | * under us, we won't even know. | |
2242 | * | |
2243 | * The only solution here is to only resynchronize our address list | |
2244 | * when: | |
2245 | * | |
2246 | * - An interfaces comes up | |
2247 | * - An interface address is added | |
2248 | * - An interface address is deleted AND the interface is up | |
2249 | * | |
2250 | * Even though this is only a problem with autoconfig at the moment I'm | |
2251 | * papering over Zebra's braindead semantics here. Every piece of code | |
2252 | * in this function should be protected by a check that the interface | |
2253 | * is up. | |
2254 | */ | |
2255 | if (if_is_operative(ifp)) | |
2256 | vrrp_autoconfig_if_address_del(ifp); | |
2257 | } | |
2258 | ||
2259 | /* Other ------------------------------------------------------------------- */ | |
2260 | ||
2261 | int vrrp_config_write_interface(struct vty *vty) | |
2262 | { | |
2263 | struct list *vrs = hash_to_list(vrrp_vrouters_hash); | |
2264 | struct listnode *ln, *ipln; | |
2265 | struct vrrp_vrouter *vr; | |
2266 | int writes = 0; | |
2267 | ||
2268 | for (ALL_LIST_ELEMENTS_RO(vrs, ln, vr)) { | |
2269 | vty_frame(vty, "interface %s\n", vr->ifp->name); | |
2270 | ++writes; | |
2271 | ||
2272 | vty_out(vty, " vrrp %" PRIu8 "%s\n", vr->vrid, | |
2273 | vr->version == 2 ? " version 2" : ""); | |
2274 | ++writes; | |
2275 | ||
2276 | if (vr->shutdown != vd.shutdown && ++writes) | |
2277 | vty_out(vty, " %svrrp %" PRIu8 " shutdown\n", | |
2278 | vr->shutdown ? "" : "no ", vr->vrid); | |
2279 | ||
2280 | if (vr->preempt_mode != vd.preempt_mode && ++writes) | |
2281 | vty_out(vty, " %svrrp %" PRIu8 " preempt\n", | |
2282 | vr->preempt_mode ? "" : "no ", vr->vrid); | |
2283 | ||
2284 | if (vr->accept_mode != vd.accept_mode && ++writes) | |
2285 | vty_out(vty, " %svrrp %" PRIu8 " accept\n", | |
2286 | vr->accept_mode ? "" : "no ", vr->vrid); | |
2287 | ||
2288 | if (vr->advertisement_interval != vd.advertisement_interval | |
2289 | && ++writes) | |
2290 | vty_out(vty, | |
2291 | " vrrp %" PRIu8 | |
2292 | " advertisement-interval %d\n", | |
2293 | vr->vrid, vr->advertisement_interval * CS2MS); | |
2294 | ||
2295 | if (vr->priority != vd.priority && ++writes) | |
2296 | vty_out(vty, " vrrp %" PRIu8 " priority %" PRIu8 "\n", | |
2297 | vr->vrid, vr->priority); | |
2298 | ||
2299 | struct ipaddr *ip; | |
2300 | ||
2301 | for (ALL_LIST_ELEMENTS_RO(vr->v4->addrs, ipln, ip)) { | |
2302 | char ipbuf[INET6_ADDRSTRLEN]; | |
2303 | ||
2304 | ipaddr2str(ip, ipbuf, sizeof(ipbuf)); | |
2305 | vty_out(vty, " vrrp %" PRIu8 " ip %s\n", vr->vrid, | |
2306 | ipbuf); | |
2307 | ++writes; | |
2308 | } | |
2309 | ||
2310 | for (ALL_LIST_ELEMENTS_RO(vr->v6->addrs, ipln, ip)) { | |
2311 | char ipbuf[INET6_ADDRSTRLEN]; | |
2312 | ||
2313 | ipaddr2str(ip, ipbuf, sizeof(ipbuf)); | |
2314 | vty_out(vty, " vrrp %" PRIu8 " ipv6 %s\n", vr->vrid, | |
2315 | ipbuf); | |
2316 | ++writes; | |
2317 | } | |
2318 | vty_endframe(vty, "!\n"); | |
2319 | } | |
2320 | ||
2321 | list_delete(&vrs); | |
2322 | ||
2323 | return writes; | |
2324 | } | |
2325 | ||
2326 | int vrrp_config_write_global(struct vty *vty) | |
2327 | { | |
2328 | unsigned int writes = 0; | |
2329 | ||
2330 | if (vrrp_autoconfig_is_on && ++writes) | |
2331 | vty_out(vty, "vrrp autoconfigure%s\n", | |
2332 | vrrp_autoconfig_version == 2 ? " version 2" : ""); | |
2333 | ||
2334 | if (vd.priority != VRRP_DEFAULT_PRIORITY && ++writes) | |
2335 | vty_out(vty, "vrrp default priority %" PRIu8 "\n", vd.priority); | |
2336 | ||
2337 | if (vd.advertisement_interval != VRRP_DEFAULT_ADVINT && ++writes) | |
2338 | vty_out(vty, | |
2339 | "vrrp default advertisement-interval %" PRIu16 "\n", | |
2340 | vd.advertisement_interval * CS2MS); | |
2341 | ||
2342 | if (vd.preempt_mode != VRRP_DEFAULT_PREEMPT && ++writes) | |
2343 | vty_out(vty, "%svrrp default preempt\n", | |
2344 | !vd.preempt_mode ? "no " : ""); | |
2345 | ||
2346 | if (vd.accept_mode != VRRP_DEFAULT_ACCEPT && ++writes) | |
2347 | vty_out(vty, "%svrrp default accept\n", | |
2348 | !vd.accept_mode ? "no " : ""); | |
2349 | ||
2350 | if (vd.shutdown != VRRP_DEFAULT_SHUTDOWN && ++writes) | |
2351 | vty_out(vty, "%svrrp default shutdown\n", | |
2352 | !vd.shutdown ? "no " : ""); | |
2353 | ||
2354 | return writes; | |
2355 | } | |
2356 | ||
2357 | static unsigned int vrrp_hash_key(const void *arg) | |
2358 | { | |
2359 | const struct vrrp_vrouter *vr = arg; | |
2360 | char key[IFNAMSIZ + 64]; | |
2361 | ||
2362 | snprintf(key, sizeof(key), "%s@%" PRIu8, vr->ifp->name, vr->vrid); | |
2363 | ||
2364 | return string_hash_make(key); | |
2365 | } | |
2366 | ||
2367 | static bool vrrp_hash_cmp(const void *arg1, const void *arg2) | |
2368 | { | |
2369 | const struct vrrp_vrouter *vr1 = arg1; | |
2370 | const struct vrrp_vrouter *vr2 = arg2; | |
2371 | ||
2372 | if (vr1->ifp != vr2->ifp) | |
2373 | return 0; | |
2374 | if (vr1->vrid != vr2->vrid) | |
2375 | return 0; | |
2376 | ||
2377 | return 1; | |
2378 | } | |
2379 | ||
2380 | void vrrp_init(void) | |
2381 | { | |
2382 | /* Set default defaults */ | |
2383 | vd.priority = VRRP_DEFAULT_PRIORITY; | |
2384 | vd.advertisement_interval = VRRP_DEFAULT_ADVINT; | |
2385 | vd.preempt_mode = VRRP_DEFAULT_PREEMPT; | |
2386 | vd.accept_mode = VRRP_DEFAULT_ACCEPT; | |
2387 | vd.shutdown = VRRP_DEFAULT_SHUTDOWN; | |
2388 | ||
2389 | vrrp_autoconfig_version = 3; | |
2390 | vrrp_vrouters_hash = hash_create(&vrrp_hash_key, vrrp_hash_cmp, | |
2391 | "VRRP virtual router hash"); | |
2392 | vrf_init(NULL, NULL, NULL, NULL, NULL); | |
2393 | } | |
2394 | ||
2395 | void vrrp_fini(void) | |
2396 | { | |
2397 | /* Destroy all instances */ | |
2398 | struct list *vrs = hash_to_list(vrrp_vrouters_hash); | |
2399 | ||
2400 | struct listnode *ln; | |
2401 | struct vrrp_vrouter *vr; | |
2402 | ||
2403 | for (ALL_LIST_ELEMENTS_RO(vrs, ln, vr)) | |
2404 | vrrp_vrouter_destroy(vr); | |
2405 | ||
2406 | list_delete(&vrs); | |
2407 | ||
2408 | hash_clean(vrrp_vrouters_hash, NULL); | |
2409 | hash_free(vrrp_vrouters_hash); | |
2410 | } |