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7e24fdf3 | 1 | /* |
8d5cbee9 | 2 | * STATICd - route code |
7e24fdf3 DS |
3 | * Copyright (C) 2018 Cumulus Networks, Inc. |
4 | * Donald Sharp | |
5 | * | |
8d5cbee9 DS |
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. | |
7e24fdf3 | 10 | * |
8d5cbee9 DS |
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. | |
7e24fdf3 DS |
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/nexthop.h> | |
23 | #include <lib/memory.h> | |
24 | #include <lib/srcdest_table.h> | |
25 | #include <lib/if.h> | |
26 | #include <lib/vty.h> | |
27 | #include <lib/vrf.h> | |
28 | #include <lib/memory.h> | |
29 | ||
30 | #include "static_vrf.h" | |
31 | #include "static_routes.h" | |
32 | #include "static_memory.h" | |
33 | #include "static_zebra.h" | |
34 | ||
35 | /* Install static route into rib. */ | |
8bc8de2c DS |
36 | static void static_install_route(struct route_node *rn, |
37 | struct static_route *si_changed, safi_t safi) | |
7e24fdf3 DS |
38 | { |
39 | struct static_route *si; | |
40 | ||
41 | for (si = rn->info; si; si = si->next) | |
42 | static_zebra_nht_register(si, true); | |
43 | ||
44 | si = rn->info; | |
45 | if (si) | |
8bc8de2c | 46 | static_zebra_route_add(rn, si_changed, si->vrf_id, safi, true); |
7e24fdf3 DS |
47 | |
48 | } | |
49 | ||
50 | /* Uninstall static route from RIB. */ | |
51 | static void static_uninstall_route(vrf_id_t vrf_id, safi_t safi, | |
8bc8de2c DS |
52 | struct route_node *rn, |
53 | struct static_route *si_changed) | |
7e24fdf3 DS |
54 | { |
55 | ||
56 | if (rn->info) | |
8bc8de2c | 57 | static_zebra_route_add(rn, si_changed, vrf_id, safi, true); |
7e24fdf3 | 58 | else |
8bc8de2c | 59 | static_zebra_route_add(rn, si_changed, vrf_id, safi, false); |
7e24fdf3 DS |
60 | } |
61 | ||
62 | int static_add_route(afi_t afi, safi_t safi, uint8_t type, struct prefix *p, | |
63 | struct prefix_ipv6 *src_p, union g_addr *gate, | |
64 | const char *ifname, enum static_blackhole_type bh_type, | |
65 | route_tag_t tag, uint8_t distance, struct static_vrf *svrf, | |
66 | struct static_vrf *nh_svrf, | |
02dc8ba3 QY |
67 | struct static_nh_label *snh_label, uint32_t table_id, |
68 | bool onlink) | |
7e24fdf3 DS |
69 | { |
70 | struct route_node *rn; | |
71 | struct static_route *si; | |
72 | struct static_route *pp; | |
73 | struct static_route *cp; | |
74 | struct static_route *update = NULL; | |
75 | struct route_table *stable = svrf->stable[afi][safi]; | |
76 | ||
77 | if (!stable) | |
78 | return -1; | |
79 | ||
80 | if (!gate && (type == STATIC_IPV4_GATEWAY | |
81 | || type == STATIC_IPV4_GATEWAY_IFNAME | |
82 | || type == STATIC_IPV6_GATEWAY | |
83 | || type == STATIC_IPV6_GATEWAY_IFNAME)) | |
84 | return -1; | |
85 | ||
86 | if (!ifname | |
87 | && (type == STATIC_IFNAME || type == STATIC_IPV4_GATEWAY_IFNAME | |
88 | || type == STATIC_IPV6_GATEWAY_IFNAME)) | |
89 | return -1; | |
90 | ||
91 | /* Lookup static route prefix. */ | |
92 | rn = srcdest_rnode_get(stable, p, src_p); | |
93 | ||
94 | /* Do nothing if there is a same static route. */ | |
95 | for (si = rn->info; si; si = si->next) { | |
96 | if (type == si->type | |
97 | && (!gate | |
98 | || ((afi == AFI_IP | |
99 | && IPV4_ADDR_SAME(&gate->ipv4, &si->addr.ipv4)) | |
100 | || (afi == AFI_IP6 | |
101 | && IPV6_ADDR_SAME(gate, &si->addr.ipv6)))) | |
102 | && (!strcmp(ifname ? ifname : "", si->ifname))) { | |
103 | if ((distance == si->distance) && (tag == si->tag) | |
104 | && (table_id == si->table_id) | |
105 | && !memcmp(&si->snh_label, snh_label, | |
106 | sizeof(struct static_nh_label)) | |
02dc8ba3 | 107 | && si->bh_type == bh_type && si->onlink == onlink) { |
7e24fdf3 DS |
108 | route_unlock_node(rn); |
109 | return 0; | |
110 | } | |
111 | update = si; | |
112 | } | |
113 | } | |
114 | ||
115 | /* Distance or tag or label changed, delete existing first. */ | |
116 | if (update) | |
117 | static_delete_route(afi, safi, type, p, src_p, gate, ifname, | |
118 | update->tag, update->distance, svrf, | |
119 | &update->snh_label, table_id); | |
120 | ||
121 | /* Make new static route structure. */ | |
122 | si = XCALLOC(MTYPE_STATIC_ROUTE, sizeof(struct static_route)); | |
123 | ||
124 | si->type = type; | |
125 | si->distance = distance; | |
126 | si->bh_type = bh_type; | |
127 | si->tag = tag; | |
128 | si->vrf_id = svrf->vrf->vrf_id; | |
129 | si->nh_vrf_id = nh_svrf->vrf->vrf_id; | |
130 | strcpy(si->nh_vrfname, nh_svrf->vrf->name); | |
131 | si->table_id = table_id; | |
02dc8ba3 | 132 | si->onlink = onlink; |
7e24fdf3 DS |
133 | |
134 | if (ifname) | |
135 | strlcpy(si->ifname, ifname, sizeof(si->ifname)); | |
136 | si->ifindex = IFINDEX_INTERNAL; | |
137 | ||
138 | switch (type) { | |
139 | case STATIC_IPV4_GATEWAY: | |
140 | case STATIC_IPV4_GATEWAY_IFNAME: | |
141 | si->addr.ipv4 = gate->ipv4; | |
142 | break; | |
143 | case STATIC_IPV6_GATEWAY: | |
144 | case STATIC_IPV6_GATEWAY_IFNAME: | |
145 | si->addr.ipv6 = gate->ipv6; | |
146 | break; | |
147 | case STATIC_IFNAME: | |
148 | break; | |
149 | } | |
150 | ||
151 | /* Save labels, if any. */ | |
152 | memcpy(&si->snh_label, snh_label, sizeof(struct static_nh_label)); | |
153 | ||
154 | /* | |
155 | * Add new static route information to the tree with sort by | |
156 | * distance value and gateway address. | |
157 | */ | |
158 | for (pp = NULL, cp = rn->info; cp; pp = cp, cp = cp->next) { | |
159 | if (si->distance < cp->distance) | |
160 | break; | |
161 | if (si->distance > cp->distance) | |
162 | continue; | |
163 | if (si->type == STATIC_IPV4_GATEWAY | |
164 | && cp->type == STATIC_IPV4_GATEWAY) { | |
165 | if (ntohl(si->addr.ipv4.s_addr) | |
166 | < ntohl(cp->addr.ipv4.s_addr)) | |
167 | break; | |
168 | if (ntohl(si->addr.ipv4.s_addr) | |
169 | > ntohl(cp->addr.ipv4.s_addr)) | |
170 | continue; | |
171 | } | |
172 | } | |
173 | ||
174 | /* Make linked list. */ | |
175 | if (pp) | |
176 | pp->next = si; | |
177 | else | |
178 | rn->info = si; | |
179 | if (cp) | |
180 | cp->prev = si; | |
181 | si->prev = pp; | |
182 | si->next = cp; | |
183 | ||
184 | /* check whether interface exists in system & install if it does */ | |
185 | if (!ifname) | |
8bc8de2c | 186 | static_install_route(rn, si, safi); |
7e24fdf3 DS |
187 | else { |
188 | struct interface *ifp; | |
189 | ||
190 | ifp = if_lookup_by_name(ifname, nh_svrf->vrf->vrf_id); | |
191 | if (ifp && ifp->ifindex != IFINDEX_INTERNAL) { | |
192 | si->ifindex = ifp->ifindex; | |
8bc8de2c | 193 | static_install_route(rn, si, safi); |
7e24fdf3 DS |
194 | } else |
195 | zlog_warn("Static Route using %s interface not installed because the interface does not exist in specified vrf", | |
196 | ifname); | |
197 | } | |
198 | ||
199 | return 1; | |
200 | } | |
201 | ||
202 | int static_delete_route(afi_t afi, safi_t safi, uint8_t type, struct prefix *p, | |
203 | struct prefix_ipv6 *src_p, union g_addr *gate, | |
204 | const char *ifname, route_tag_t tag, uint8_t distance, | |
205 | struct static_vrf *svrf, | |
206 | struct static_nh_label *snh_label, | |
207 | uint32_t table_id) | |
208 | { | |
209 | struct route_node *rn; | |
210 | struct static_route *si; | |
211 | struct route_table *stable; | |
212 | ||
213 | /* Lookup table. */ | |
214 | stable = static_vrf_static_table(afi, safi, svrf); | |
215 | if (!stable) | |
216 | return -1; | |
217 | ||
218 | /* Lookup static route prefix. */ | |
219 | rn = srcdest_rnode_lookup(stable, p, src_p); | |
220 | if (!rn) | |
221 | return 0; | |
222 | ||
223 | /* Find same static route is the tree */ | |
224 | for (si = rn->info; si; si = si->next) | |
225 | if (type == si->type | |
226 | && (!gate | |
227 | || ((afi == AFI_IP | |
228 | && IPV4_ADDR_SAME(&gate->ipv4, &si->addr.ipv4)) | |
229 | || (afi == AFI_IP6 | |
230 | && IPV6_ADDR_SAME(gate, &si->addr.ipv6)))) | |
231 | && (!strcmp(ifname ? ifname : "", si->ifname)) | |
232 | && (!tag || (tag == si->tag)) | |
233 | && (table_id == si->table_id) | |
234 | && (!snh_label->num_labels | |
235 | || !memcmp(&si->snh_label, snh_label, | |
236 | sizeof(struct static_nh_label)))) | |
237 | break; | |
238 | ||
239 | /* Can't find static route. */ | |
240 | if (!si) { | |
241 | route_unlock_node(rn); | |
242 | return 0; | |
243 | } | |
244 | ||
245 | static_zebra_nht_register(si, false); | |
246 | ||
247 | /* Unlink static route from linked list. */ | |
248 | if (si->prev) | |
249 | si->prev->next = si->next; | |
250 | else | |
251 | rn->info = si->next; | |
252 | if (si->next) | |
253 | si->next->prev = si->prev; | |
254 | ||
255 | /* | |
256 | * If we have other si nodes then route replace | |
257 | * else delete the route | |
258 | */ | |
8bc8de2c | 259 | static_uninstall_route(si->vrf_id, safi, rn, si); |
7e24fdf3 DS |
260 | route_unlock_node(rn); |
261 | ||
262 | /* Free static route configuration. */ | |
263 | XFREE(MTYPE_STATIC_ROUTE, si); | |
264 | ||
265 | route_unlock_node(rn); | |
266 | ||
267 | return 1; | |
268 | } | |
269 | ||
270 | static void static_ifindex_update_af(struct interface *ifp, bool up, afi_t afi, | |
271 | safi_t safi) | |
272 | { | |
273 | struct route_table *stable; | |
274 | struct route_node *rn; | |
275 | struct static_route *si; | |
276 | struct vrf *vrf; | |
277 | ||
278 | RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name) { | |
279 | struct static_vrf *svrf; | |
280 | ||
281 | svrf = vrf->info; | |
282 | ||
283 | stable = static_vrf_static_table(afi, safi, svrf); | |
284 | if (!stable) | |
285 | continue; | |
286 | ||
287 | for (rn = route_top(stable); rn; rn = srcdest_route_next(rn)) { | |
288 | for (si = rn->info; si; si = si->next) { | |
289 | if (!si->ifname[0]) | |
290 | continue; | |
291 | if (up) { | |
292 | if (strcmp(si->ifname, ifp->name)) | |
293 | continue; | |
294 | si->ifindex = ifp->ifindex; | |
295 | } else { | |
296 | if (si->ifindex != ifp->ifindex) | |
297 | continue; | |
298 | si->ifindex = IFINDEX_INTERNAL; | |
299 | } | |
7e24fdf3 | 300 | |
0b70cb10 DS |
301 | static_install_route(rn, si, safi); |
302 | } | |
7e24fdf3 DS |
303 | } |
304 | } | |
305 | } | |
306 | ||
307 | /* | |
308 | * This function looks at a svrf's stable and notices if any of the | |
309 | * nexthops we are using are part of the vrf coming up. | |
310 | * If we are using them then cleanup the nexthop vrf id | |
311 | * to be the new value and then re-installs them | |
312 | * | |
313 | * | |
314 | * stable -> The table we are looking at. | |
315 | * svrf -> The newly changed vrf. | |
316 | * afi -> The afi to look at | |
317 | * safi -> the safi to look at | |
318 | */ | |
319 | static void static_fixup_vrf(struct static_vrf *svrf, | |
320 | struct route_table *stable, afi_t afi, safi_t safi) | |
321 | { | |
322 | struct route_node *rn; | |
323 | struct static_route *si; | |
324 | struct interface *ifp; | |
7e24fdf3 DS |
325 | |
326 | for (rn = route_top(stable); rn; rn = route_next(rn)) { | |
7e24fdf3 DS |
327 | for (si = rn->info; si; si = si->next) { |
328 | if (strcmp(svrf->vrf->name, si->nh_vrfname) != 0) | |
329 | continue; | |
330 | ||
331 | si->nh_vrf_id = svrf->vrf->vrf_id; | |
7e24fdf3 DS |
332 | if (si->ifindex) { |
333 | ifp = if_lookup_by_name(si->ifname, | |
334 | si->nh_vrf_id); | |
335 | if (ifp) | |
336 | si->ifindex = ifp->ifindex; | |
337 | else | |
338 | continue; | |
339 | } | |
7e24fdf3 | 340 | |
8bc8de2c | 341 | static_install_route(rn, si, safi); |
0b70cb10 | 342 | } |
7e24fdf3 DS |
343 | } |
344 | } | |
345 | ||
346 | /* | |
347 | * This function enables static routes in a svrf as it | |
348 | * is coming up. It sets the new vrf_id as appropriate. | |
349 | * | |
350 | * svrf -> The svrf that is being brought up and enabled by the kernel | |
351 | * stable -> The stable we are looking at. | |
352 | * afi -> the afi in question | |
353 | * safi -> the safi in question | |
354 | */ | |
355 | static void static_enable_vrf(struct static_vrf *svrf, | |
356 | struct route_table *stable, | |
357 | afi_t afi, safi_t safi) | |
358 | { | |
359 | struct route_node *rn; | |
360 | struct static_route *si; | |
361 | struct interface *ifp; | |
362 | struct vrf *vrf = svrf->vrf; | |
7e24fdf3 DS |
363 | |
364 | for (rn = route_top(stable); rn; rn = route_next(rn)) { | |
7e24fdf3 DS |
365 | for (si = rn->info; si; si = si->next) { |
366 | si->vrf_id = vrf->vrf_id; | |
367 | if (si->ifindex) { | |
368 | ifp = if_lookup_by_name(si->ifname, | |
369 | si->nh_vrf_id); | |
370 | if (ifp) | |
371 | si->ifindex = ifp->ifindex; | |
372 | else | |
373 | continue; | |
374 | } | |
8bc8de2c | 375 | static_install_route(rn, si, safi); |
0b70cb10 | 376 | } |
7e24fdf3 DS |
377 | } |
378 | } | |
379 | ||
380 | /* | |
381 | * When a vrf is being enabled by the kernel, go through all the | |
382 | * static routes in the system that use this vrf (both nexthops vrfs | |
383 | * and the routes vrf ) | |
384 | * | |
385 | * enable_svrf -> the vrf being enabled | |
386 | */ | |
387 | void static_fixup_vrf_ids(struct static_vrf *enable_svrf) | |
388 | { | |
389 | struct route_table *stable; | |
390 | struct vrf *vrf; | |
391 | afi_t afi; | |
392 | safi_t safi; | |
393 | ||
394 | RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name) { | |
395 | struct static_vrf *svrf; | |
396 | ||
397 | svrf = vrf->info; | |
398 | /* Install any static routes configured for this VRF. */ | |
399 | for (afi = AFI_IP; afi < AFI_MAX; afi++) { | |
400 | for (safi = SAFI_UNICAST; safi < SAFI_MAX; safi++) { | |
401 | stable = svrf->stable[afi][safi]; | |
402 | if (!stable) | |
403 | continue; | |
404 | ||
405 | static_fixup_vrf(enable_svrf, stable, | |
406 | afi, safi); | |
407 | ||
408 | if (enable_svrf == svrf) | |
409 | static_enable_vrf(svrf, stable, | |
410 | afi, safi); | |
411 | } | |
412 | } | |
413 | } | |
414 | } | |
415 | ||
416 | /* | |
417 | * Look at the specified stable and if any of the routes in | |
418 | * this table are using the svrf as the nexthop, uninstall | |
419 | * those routes. | |
420 | * | |
421 | * svrf -> the vrf being disabled | |
422 | * stable -> the table we need to look at. | |
423 | * afi -> the afi in question | |
424 | * safi -> the safi in question | |
425 | */ | |
426 | static void static_cleanup_vrf(struct static_vrf *svrf, | |
427 | struct route_table *stable, | |
428 | afi_t afi, safi_t safi) | |
429 | { | |
430 | struct route_node *rn; | |
431 | struct static_route *si; | |
432 | ||
433 | for (rn = route_top(stable); rn; rn = route_next(rn)) { | |
434 | for (si = rn->info; si; si = si->next) { | |
435 | if (strcmp(svrf->vrf->name, si->nh_vrfname) != 0) | |
436 | continue; | |
437 | ||
8bc8de2c | 438 | static_uninstall_route(si->vrf_id, safi, rn, si); |
7e24fdf3 DS |
439 | } |
440 | } | |
441 | } | |
442 | ||
443 | /* | |
444 | * Look at all static routes in this table and uninstall | |
445 | * them. | |
446 | * | |
447 | * stable -> The table to uninstall from | |
448 | * afi -> The afi in question | |
449 | * safi -> the safi in question | |
450 | */ | |
451 | static void static_disable_vrf(struct route_table *stable, | |
452 | afi_t afi, safi_t safi) | |
453 | { | |
454 | struct route_node *rn; | |
455 | struct static_route *si; | |
456 | ||
457 | for (rn = route_top(stable); rn; rn = route_next(rn)) | |
458 | for (si = rn->info; si; si = si->next) | |
8bc8de2c | 459 | static_uninstall_route(si->vrf_id, safi, rn, si); |
7e24fdf3 DS |
460 | } |
461 | ||
462 | /* | |
463 | * When the disable_svrf is shutdown by the kernel, we call | |
464 | * this function and it cleans up all static routes using | |
465 | * this vrf as a nexthop as well as all static routes | |
466 | * in it's stables. | |
467 | * | |
468 | * disable_svrf - The vrf being disabled | |
469 | */ | |
470 | void static_cleanup_vrf_ids(struct static_vrf *disable_svrf) | |
471 | { | |
472 | struct vrf *vrf; | |
473 | afi_t afi; | |
474 | safi_t safi; | |
475 | ||
476 | RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name) { | |
477 | struct static_vrf *svrf; | |
478 | ||
479 | svrf = vrf->info; | |
480 | ||
481 | /* Uninstall any static routes configured for this VRF. */ | |
482 | for (afi = AFI_IP; afi < AFI_MAX; afi++) { | |
483 | for (safi = SAFI_UNICAST; safi < SAFI_MAX; safi++) { | |
484 | struct route_table *stable; | |
485 | ||
486 | stable = svrf->stable[afi][safi]; | |
487 | if (!stable) | |
488 | continue; | |
489 | ||
490 | static_cleanup_vrf(disable_svrf, stable, | |
491 | afi, safi); | |
492 | ||
493 | if (disable_svrf == svrf) | |
494 | static_disable_vrf(stable, afi, safi); | |
495 | } | |
496 | } | |
497 | } | |
498 | } | |
499 | ||
500 | /* called from if_{add,delete}_update, i.e. when ifindex becomes [in]valid */ | |
501 | void static_ifindex_update(struct interface *ifp, bool up) | |
502 | { | |
503 | static_ifindex_update_af(ifp, up, AFI_IP, SAFI_UNICAST); | |
504 | static_ifindex_update_af(ifp, up, AFI_IP, SAFI_MULTICAST); | |
505 | static_ifindex_update_af(ifp, up, AFI_IP6, SAFI_UNICAST); | |
506 | static_ifindex_update_af(ifp, up, AFI_IP6, SAFI_MULTICAST); | |
507 | } |