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e5c83d9b DS |
1 | /* |
2 | * Zebra connect code. | |
3 | * Copyright (C) 2018 Cumulus Networks, Inc. | |
4 | * Donald Sharp | |
5 | * | |
6 | * FRR 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 | |
8 | * Free Software Foundation; either version 2, or (at your option) any | |
9 | * later version. | |
10 | * | |
11 | * FRR is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for 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 "thread.h" | |
23 | #include "command.h" | |
24 | #include "network.h" | |
25 | #include "prefix.h" | |
26 | #include "routemap.h" | |
27 | #include "table.h" | |
28 | #include "stream.h" | |
29 | #include "memory.h" | |
30 | #include "zclient.h" | |
31 | #include "filter.h" | |
32 | #include "plist.h" | |
33 | #include "log.h" | |
34 | #include "nexthop.h" | |
35 | #include "nexthop_group.h" | |
36 | ||
37 | #include "pbr_nht.h" | |
38 | #include "pbr_map.h" | |
39 | #include "pbr_memory.h" | |
40 | #include "pbr_zebra.h" | |
41 | #include "pbr_debug.h" | |
42 | ||
43 | DEFINE_MTYPE_STATIC(PBRD, PBR_INTERFACE, "PBR Interface") | |
44 | ||
45 | /* Zebra structure to hold current status. */ | |
d3765386 | 46 | struct zclient *zclient; |
e5c83d9b DS |
47 | |
48 | static struct interface *zebra_interface_if_lookup(struct stream *s) | |
49 | { | |
50 | char ifname_tmp[INTERFACE_NAMSIZ]; | |
51 | ||
52 | /* Read interface name. */ | |
53 | stream_get(ifname_tmp, s, INTERFACE_NAMSIZ); | |
54 | ||
55 | /* And look it up. */ | |
56 | return if_lookup_by_name(ifname_tmp, VRF_DEFAULT); | |
57 | } | |
58 | ||
b13e5ad6 | 59 | struct pbr_interface *pbr_if_new(struct interface *ifp) |
e5c83d9b DS |
60 | { |
61 | struct pbr_interface *pbr_ifp; | |
62 | ||
63 | zassert(ifp); | |
64 | zassert(!ifp->info); | |
65 | ||
66 | pbr_ifp = XCALLOC(MTYPE_PBR_INTERFACE, sizeof(*pbr_ifp)); | |
67 | ||
68 | if (!pbr_ifp) { | |
69 | zlog_err("%s: PBR XCALLOC(%zu) failure", __PRETTY_FUNCTION__, | |
70 | sizeof(*pbr_ifp)); | |
71 | return 0; | |
72 | } | |
73 | ||
74 | return (pbr_ifp); | |
75 | } | |
76 | ||
77 | /* Inteface addition message from zebra. */ | |
78 | static int interface_add(int command, struct zclient *zclient, | |
79 | zebra_size_t length, vrf_id_t vrf_id) | |
80 | { | |
81 | struct interface *ifp; | |
82 | ||
83 | ifp = zebra_interface_add_read(zclient->ibuf, vrf_id); | |
84 | ||
85 | if (!ifp) | |
86 | return 0; | |
87 | ||
88 | if (!ifp->info) { | |
89 | struct pbr_interface *pbr_ifp; | |
90 | ||
91 | pbr_ifp = pbr_if_new(ifp); | |
92 | ifp->info = pbr_ifp; | |
93 | } | |
94 | ||
95 | return 0; | |
96 | } | |
97 | ||
98 | static int interface_delete(int command, struct zclient *zclient, | |
99 | zebra_size_t length, vrf_id_t vrf_id) | |
100 | { | |
101 | struct interface *ifp; | |
102 | struct stream *s; | |
103 | ||
104 | s = zclient->ibuf; | |
105 | /* zebra_interface_state_read () updates interface structure in iflist | |
106 | */ | |
107 | ifp = zebra_interface_state_read(s, vrf_id); | |
108 | ||
109 | if (ifp == NULL) | |
110 | return 0; | |
111 | ||
112 | if_set_index(ifp, IFINDEX_INTERNAL); | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
117 | static int interface_address_add(int command, struct zclient *zclient, | |
118 | zebra_size_t length, vrf_id_t vrf_id) | |
119 | { | |
120 | zebra_interface_address_read(command, zclient->ibuf, vrf_id); | |
121 | ||
122 | return 0; | |
123 | } | |
124 | ||
125 | static int interface_address_delete(int command, struct zclient *zclient, | |
126 | zebra_size_t length, vrf_id_t vrf_id) | |
127 | { | |
128 | struct connected *c; | |
129 | ||
130 | c = zebra_interface_address_read(command, zclient->ibuf, vrf_id); | |
131 | ||
132 | if (!c) | |
133 | return 0; | |
134 | ||
135 | connected_free(c); | |
136 | return 0; | |
137 | } | |
138 | ||
139 | static int interface_state_up(int command, struct zclient *zclient, | |
140 | zebra_size_t length, vrf_id_t vrf_id) | |
141 | { | |
142 | ||
143 | zebra_interface_if_lookup(zclient->ibuf); | |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
148 | static int interface_state_down(int command, struct zclient *zclient, | |
149 | zebra_size_t length, vrf_id_t vrf_id) | |
150 | { | |
151 | ||
152 | zebra_interface_state_read(zclient->ibuf, vrf_id); | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
157 | static int route_notify_owner(int command, struct zclient *zclient, | |
158 | zebra_size_t length, vrf_id_t vrf_id) | |
159 | { | |
160 | struct prefix p; | |
161 | enum zapi_route_notify_owner note; | |
162 | uint32_t table_id; | |
163 | char buf[PREFIX_STRLEN]; | |
164 | ||
165 | prefix2str(&p, buf, sizeof(buf)); | |
166 | ||
167 | if (!zapi_route_notify_decode(zclient->ibuf, &p, &table_id, ¬e)) | |
168 | return -1; | |
169 | ||
170 | switch (note) { | |
171 | case ZAPI_ROUTE_FAIL_INSTALL: | |
172 | DEBUGD(&pbr_dbg_zebra, | |
173 | "%s: [%s] Route install failure for table: %u", | |
174 | __PRETTY_FUNCTION__, buf, table_id); | |
175 | break; | |
176 | case ZAPI_ROUTE_BETTER_ADMIN_WON: | |
177 | DEBUGD(&pbr_dbg_zebra, | |
178 | "%s: [%s] Route better admin distance won for table: %u", | |
179 | __PRETTY_FUNCTION__, buf, table_id); | |
180 | break; | |
181 | case ZAPI_ROUTE_INSTALLED: | |
182 | DEBUGD(&pbr_dbg_zebra, | |
183 | "%s: [%s] Route installed succeeded for table: %u", | |
184 | __PRETTY_FUNCTION__, buf, table_id); | |
185 | pbr_nht_route_installed_for_table(table_id); | |
186 | break; | |
187 | case ZAPI_ROUTE_REMOVED: | |
188 | DEBUGD(&pbr_dbg_zebra, | |
189 | "%s: [%s] Route Removed succeeded for table: %u", | |
190 | __PRETTY_FUNCTION__, buf, table_id); | |
191 | pbr_nht_route_removed_for_table(table_id); | |
192 | break; | |
193 | case ZAPI_ROUTE_REMOVE_FAIL: | |
194 | DEBUGD(&pbr_dbg_zebra, | |
195 | "%s: [%s] Route remove fail for table: %u", | |
196 | __PRETTY_FUNCTION__, buf, table_id); | |
197 | break; | |
198 | } | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | static int rule_notify_owner(int command, struct zclient *zclient, | |
204 | zebra_size_t length, vrf_id_t vrf_id) | |
205 | { | |
206 | uint32_t seqno, priority, unique; | |
207 | enum zapi_rule_notify_owner note; | |
208 | struct pbr_map_sequence *pbrms; | |
209 | ifindex_t ifi; | |
210 | ||
211 | if (!zapi_rule_notify_decode(zclient->ibuf, &seqno, &priority, &unique, | |
212 | &ifi, ¬e)) | |
213 | return -1; | |
214 | ||
215 | pbrms = pbrms_lookup_unique(unique, ifi); | |
216 | if (!pbrms) { | |
217 | DEBUGD(&pbr_dbg_zebra, | |
218 | "%s: Failure to lookup pbrms based upon %u", | |
219 | __PRETTY_FUNCTION__, unique); | |
220 | return 0; | |
221 | } | |
222 | ||
223 | switch (note) { | |
224 | case ZAPI_RULE_FAIL_INSTALL: | |
225 | DEBUGD(&pbr_dbg_zebra, "%s: Recieved RULE_FAIL_INSTALL", | |
226 | __PRETTY_FUNCTION__); | |
227 | pbrms->installed = false; | |
228 | break; | |
229 | case ZAPI_RULE_INSTALLED: | |
230 | pbrms->installed = true; | |
231 | DEBUGD(&pbr_dbg_zebra, "%s: Recived RULE_INSTALLED", | |
232 | __PRETTY_FUNCTION__); | |
233 | break; | |
234 | case ZAPI_RULE_REMOVED: | |
235 | DEBUGD(&pbr_dbg_zebra, "%s: Received RULE REMOVED", | |
236 | __PRETTY_FUNCTION__); | |
237 | break; | |
238 | } | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
243 | static void zebra_connected(struct zclient *zclient) | |
244 | { | |
245 | zclient_send_reg_requests(zclient, VRF_DEFAULT); | |
246 | } | |
247 | ||
248 | static void route_add_helper(struct zapi_route *api, struct nexthop_group nhg, | |
249 | uint8_t install_afi) | |
250 | { | |
251 | struct zapi_nexthop *api_nh; | |
252 | struct nexthop *nhop; | |
253 | int i; | |
254 | ||
255 | api->prefix.family = install_afi; | |
256 | ||
257 | i = 0; | |
258 | for (ALL_NEXTHOPS(nhg, nhop)) { | |
259 | api_nh = &api->nexthops[i]; | |
260 | api_nh->vrf_id = nhop->vrf_id; | |
261 | api_nh->type = nhop->type; | |
262 | switch (nhop->type) { | |
263 | case NEXTHOP_TYPE_IPV4: | |
264 | api_nh->gate.ipv4 = nhop->gate.ipv4; | |
265 | break; | |
266 | case NEXTHOP_TYPE_IPV4_IFINDEX: | |
267 | api_nh->gate.ipv4 = nhop->gate.ipv4; | |
268 | api_nh->ifindex = nhop->ifindex; | |
269 | break; | |
270 | case NEXTHOP_TYPE_IFINDEX: | |
271 | api_nh->ifindex = nhop->ifindex; | |
272 | break; | |
273 | case NEXTHOP_TYPE_IPV6: | |
274 | memcpy(&api_nh->gate.ipv6, &nhop->gate.ipv6, 16); | |
275 | break; | |
276 | case NEXTHOP_TYPE_IPV6_IFINDEX: | |
277 | api_nh->ifindex = nhop->ifindex; | |
278 | memcpy(&api_nh->gate.ipv6, &nhop->gate.ipv6, 16); | |
279 | break; | |
280 | case NEXTHOP_TYPE_BLACKHOLE: | |
281 | api_nh->bh_type = nhop->bh_type; | |
282 | break; | |
283 | } | |
284 | i++; | |
285 | } | |
286 | api->nexthop_num = i; | |
287 | ||
288 | zclient_route_send(ZEBRA_ROUTE_ADD, zclient, api); | |
289 | } | |
290 | ||
291 | /* | |
292 | * This function assumes a default route is being | |
293 | * installed into the appropriate tableid | |
294 | */ | |
295 | void route_add(struct pbr_nexthop_group_cache *pnhgc, struct nexthop_group nhg, | |
296 | afi_t install_afi) | |
297 | { | |
298 | struct zapi_route api; | |
299 | ||
300 | memset(&api, 0, sizeof(api)); | |
301 | ||
302 | api.vrf_id = VRF_DEFAULT; | |
303 | api.type = ZEBRA_ROUTE_PBR; | |
304 | api.safi = SAFI_UNICAST; | |
305 | /* | |
306 | * Sending a default route | |
307 | */ | |
308 | api.tableid = pnhgc->table_id; | |
309 | SET_FLAG(api.flags, ZEBRA_FLAG_ALLOW_RECURSION); | |
310 | SET_FLAG(api.message, ZAPI_MESSAGE_TABLEID); | |
311 | SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP); | |
312 | switch (install_afi) { | |
313 | case AFI_MAX: | |
314 | route_add_helper(&api, nhg, AF_INET); | |
315 | route_add_helper(&api, nhg, AF_INET6); | |
316 | break; | |
317 | case AFI_IP: | |
318 | route_add_helper(&api, nhg, AF_INET); | |
319 | break; | |
320 | case AFI_IP6: | |
321 | route_add_helper(&api, nhg, AF_INET6); | |
322 | break; | |
323 | case AFI_L2VPN: | |
324 | DEBUGD(&pbr_dbg_zebra, | |
325 | "%s: Asked to install unsupported route type: L2VPN", | |
326 | __PRETTY_FUNCTION__); | |
327 | break; | |
328 | } | |
329 | } | |
330 | ||
331 | /* | |
332 | * This function assumes a default route is being | |
333 | * removed from the appropriate tableid | |
334 | */ | |
335 | void route_delete(struct pbr_nexthop_group_cache *pnhgc, afi_t afi) | |
336 | { | |
337 | struct zapi_route api; | |
338 | ||
339 | memset(&api, 0, sizeof(api)); | |
340 | api.vrf_id = VRF_DEFAULT; | |
341 | api.type = ZEBRA_ROUTE_PBR; | |
342 | api.safi = SAFI_UNICAST; | |
343 | ||
344 | api.tableid = pnhgc->table_id; | |
345 | SET_FLAG(api.message, ZAPI_MESSAGE_TABLEID); | |
346 | ||
347 | switch (afi) { | |
348 | case AFI_IP: | |
349 | api.prefix.family = AF_INET; | |
350 | zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api); | |
351 | break; | |
352 | case AFI_IP6: | |
353 | api.prefix.family = AF_INET6; | |
354 | zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api); | |
355 | break; | |
356 | case AFI_MAX: | |
357 | api.prefix.family = AF_INET; | |
358 | zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api); | |
359 | api.prefix.family = AF_INET6; | |
360 | zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api); | |
361 | break; | |
362 | case AFI_L2VPN: | |
363 | DEBUGD(&pbr_dbg_zebra, | |
364 | "%s: Asked to delete unsupported route type: L2VPN", | |
365 | __PRETTY_FUNCTION__); | |
366 | break; | |
367 | } | |
e5c83d9b DS |
368 | } |
369 | ||
370 | static int pbr_zebra_nexthop_update(int command, struct zclient *zclient, | |
371 | zebra_size_t length, vrf_id_t vrf_id) | |
372 | { | |
373 | struct zapi_route nhr; | |
374 | char buf[PREFIX2STR_BUFFER]; | |
375 | uint32_t i; | |
376 | ||
377 | zapi_nexthop_update_decode(zclient->ibuf, &nhr); | |
378 | ||
379 | if (DEBUG_MODE_CHECK(&pbr_dbg_zebra, DEBUG_MODE_ALL)) { | |
380 | ||
381 | DEBUGD(&pbr_dbg_zebra, "%s: Received Nexthop update: %s", | |
382 | __PRETTY_FUNCTION__, | |
383 | prefix2str(&nhr.prefix, buf, sizeof(buf))); | |
384 | ||
385 | DEBUGD(&pbr_dbg_zebra, "%s: (\tNexthops(%u)", | |
386 | __PRETTY_FUNCTION__, nhr.nexthop_num); | |
387 | ||
388 | for (i = 0; i < nhr.nexthop_num; i++) { | |
389 | DEBUGD(&pbr_dbg_zebra, | |
390 | "%s: \tType: %d: vrf: %d, ifindex: %d gate: %s", | |
391 | __PRETTY_FUNCTION__, nhr.nexthops[i].type, | |
392 | nhr.nexthops[i].vrf_id, nhr.nexthops[i].ifindex, | |
393 | inet_ntoa(nhr.nexthops[i].gate.ipv4)); | |
394 | } | |
395 | } | |
396 | ||
397 | pbr_nht_nexthop_update(&nhr); | |
398 | return 1; | |
399 | } | |
400 | ||
401 | extern struct zebra_privs_t pbr_privs; | |
402 | ||
403 | void pbr_zebra_init(void) | |
404 | { | |
405 | struct zclient_options opt = { .receive_notify = true }; | |
406 | ||
407 | zclient = zclient_new_notify(master, &opt); | |
408 | ||
409 | zclient_init(zclient, ZEBRA_ROUTE_PBR, 0, &pbr_privs); | |
410 | zclient->zebra_connected = zebra_connected; | |
411 | zclient->interface_add = interface_add; | |
412 | zclient->interface_delete = interface_delete; | |
413 | zclient->interface_up = interface_state_up; | |
414 | zclient->interface_down = interface_state_down; | |
415 | zclient->interface_address_add = interface_address_add; | |
416 | zclient->interface_address_delete = interface_address_delete; | |
417 | zclient->route_notify_owner = route_notify_owner; | |
418 | zclient->rule_notify_owner = rule_notify_owner; | |
419 | zclient->nexthop_update = pbr_zebra_nexthop_update; | |
420 | } | |
421 | ||
422 | void pbr_send_rnh(struct nexthop *nhop, bool reg) | |
423 | { | |
424 | uint32_t command; | |
425 | struct prefix p; | |
426 | ||
427 | command = (reg) ? | |
428 | ZEBRA_NEXTHOP_REGISTER : ZEBRA_NEXTHOP_UNREGISTER; | |
429 | ||
430 | memset(&p, 0, sizeof(p)); | |
d3765386 | 431 | switch (nhop->type) { |
e5c83d9b DS |
432 | case NEXTHOP_TYPE_IFINDEX: |
433 | case NEXTHOP_TYPE_BLACKHOLE: | |
434 | return; | |
435 | case NEXTHOP_TYPE_IPV4: | |
436 | case NEXTHOP_TYPE_IPV4_IFINDEX: | |
437 | p.family = AF_INET; | |
438 | p.u.prefix4.s_addr = nhop->gate.ipv4.s_addr; | |
439 | p.prefixlen = 32; | |
440 | break; | |
441 | case NEXTHOP_TYPE_IPV6: | |
442 | case NEXTHOP_TYPE_IPV6_IFINDEX: | |
443 | p.family = AF_INET6; | |
444 | memcpy(&p.u.prefix6, &nhop->gate.ipv6, 16); | |
445 | p.prefixlen = 128; | |
446 | break; | |
447 | } | |
448 | ||
449 | if (zclient_send_rnh(zclient, command, &p, | |
450 | false, nhop->vrf_id) < 0) { | |
451 | zlog_warn("%s: Failure to send nexthop to zebra", | |
452 | __PRETTY_FUNCTION__); | |
453 | } | |
454 | } | |
455 | ||
456 | static void pbr_encode_pbr_map_sequence_prefix(struct stream *s, | |
457 | struct prefix *p, | |
49027ce8 | 458 | unsigned char family) |
e5c83d9b DS |
459 | { |
460 | struct prefix any; | |
461 | ||
462 | if (!p) { | |
463 | memset(&any, 0, sizeof(any)); | |
464 | any.family = family; | |
465 | p = &any; | |
466 | } | |
467 | ||
468 | stream_putc(s, p->family); | |
469 | stream_putc(s, p->prefixlen); | |
470 | stream_put(s, &p->u.prefix, prefix_blen(p)); | |
471 | } | |
472 | ||
473 | static void pbr_encode_pbr_map_sequence(struct stream *s, | |
474 | struct pbr_map_sequence *pbrms, | |
475 | struct interface *ifp) | |
476 | { | |
49027ce8 | 477 | unsigned char family; |
e5c83d9b DS |
478 | |
479 | family = AF_INET; | |
49027ce8 DS |
480 | if (pbrms->family) |
481 | family = pbrms->family; | |
e5c83d9b DS |
482 | |
483 | stream_putl(s, pbrms->seqno); | |
484 | stream_putl(s, pbrms->ruleno); | |
485 | stream_putl(s, pbrms->unique); | |
486 | pbr_encode_pbr_map_sequence_prefix(s, pbrms->src, family); | |
487 | stream_putw(s, 0); /* src port */ | |
488 | pbr_encode_pbr_map_sequence_prefix(s, pbrms->dst, family); | |
489 | stream_putw(s, 0); /* dst port */ | |
490 | if (pbrms->nhgrp_name) | |
491 | stream_putl(s, pbr_nht_get_table(pbrms->nhgrp_name)); | |
492 | else if (pbrms->nhg) | |
493 | stream_putl(s, pbr_nht_get_table(pbrms->internal_nhg_name)); | |
494 | stream_putl(s, ifp->ifindex); | |
495 | } | |
496 | ||
b13e5ad6 DS |
497 | void pbr_send_pbr_map(struct pbr_map_sequence *pbrms, |
498 | struct pbr_map_interface *pmi, bool install) | |
e5c83d9b | 499 | { |
b13e5ad6 | 500 | struct pbr_map *pbrm = pbrms->parent; |
e5c83d9b | 501 | struct stream *s; |
e5c83d9b DS |
502 | |
503 | DEBUGD(&pbr_dbg_zebra, "%s: for %s %d", __PRETTY_FUNCTION__, pbrm->name, | |
504 | install); | |
505 | ||
506 | s = zclient->obuf; | |
507 | stream_reset(s); | |
508 | ||
509 | zclient_create_header(s, | |
510 | install ? ZEBRA_RULE_ADD : ZEBRA_RULE_DELETE, | |
511 | VRF_DEFAULT); | |
512 | ||
b13e5ad6 DS |
513 | /* |
514 | * We are sending one item at a time at the moment | |
515 | */ | |
516 | stream_putl(s, 1); | |
e5c83d9b | 517 | |
b13e5ad6 DS |
518 | DEBUGD(&pbr_dbg_zebra, "%s: \t%s %s %d %s %u", |
519 | __PRETTY_FUNCTION__, install ? "Installing" : "Deleting", | |
520 | pbrm->name, install, pmi->ifp->name, pmi->delete); | |
e5c83d9b | 521 | |
b13e5ad6 | 522 | pbr_encode_pbr_map_sequence(s, pbrms, pmi->ifp); |
e5c83d9b | 523 | |
e5c83d9b DS |
524 | stream_putw_at(s, 0, stream_get_endp(s)); |
525 | ||
e5c83d9b DS |
526 | zclient_send_message(zclient); |
527 | } |