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6e68a084 HS |
1 | /* |
2 | * Zebra SRv6 definitions | |
3 | * Copyright (C) 2020 Hiroki Shirokura, LINE Corporation | |
4 | * Copyright (C) 2020 Masakazu Asama | |
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 | ||
21 | #include <zebra.h> | |
22 | ||
23 | #include "network.h" | |
24 | #include "prefix.h" | |
25 | #include "stream.h" | |
26 | #include "srv6.h" | |
27 | #include "zebra/debug.h" | |
28 | #include "zebra/zapi_msg.h" | |
29 | #include "zebra/zserv.h" | |
30 | #include "zebra/zebra_router.h" | |
31 | #include "zebra/zebra_srv6.h" | |
32 | #include "zebra/zebra_errors.h" | |
33 | #include <stdio.h> | |
34 | #include <string.h> | |
35 | #include <stdlib.h> | |
36 | #include <arpa/inet.h> | |
37 | #include <netinet/in.h> | |
38 | ||
39 | #include <stdio.h> | |
40 | #include <string.h> | |
41 | #include <stdlib.h> | |
42 | #include <arpa/inet.h> | |
43 | #include <netinet/in.h> | |
44 | ||
45 | ||
46 | DEFINE_MGROUP(SRV6_MGR, "SRv6 Manager"); | |
47 | DEFINE_MTYPE_STATIC(SRV6_MGR, SRV6M_CHUNK, "SRv6 Manager Chunk"); | |
48 | ||
49 | /* define hooks for the basic API, so that it can be specialized or served | |
50 | * externally | |
51 | */ | |
52 | ||
53 | DEFINE_HOOK(srv6_manager_client_connect, | |
54 | (struct zserv *client, vrf_id_t vrf_id), | |
55 | (client, vrf_id)); | |
56 | DEFINE_HOOK(srv6_manager_client_disconnect, | |
57 | (struct zserv *client), (client)); | |
58 | DEFINE_HOOK(srv6_manager_get_chunk, | |
59 | (struct srv6_locator **loc, | |
60 | struct zserv *client, | |
61 | const char *locator_name, | |
62 | vrf_id_t vrf_id), | |
63 | (loc, client, locator_name, vrf_id)); | |
64 | DEFINE_HOOK(srv6_manager_release_chunk, | |
65 | (struct zserv *client, | |
66 | const char *locator_name, | |
67 | vrf_id_t vrf_id), | |
68 | (client, locator_name, vrf_id)); | |
69 | ||
70 | /* define wrappers to be called in zapi_msg.c (as hooks must be called in | |
71 | * source file where they were defined) | |
72 | */ | |
73 | ||
74 | void srv6_manager_client_connect_call(struct zserv *client, vrf_id_t vrf_id) | |
75 | { | |
76 | hook_call(srv6_manager_client_connect, client, vrf_id); | |
77 | } | |
78 | ||
79 | void srv6_manager_get_locator_chunk_call(struct srv6_locator **loc, | |
80 | struct zserv *client, | |
81 | const char *locator_name, | |
82 | vrf_id_t vrf_id) | |
83 | { | |
84 | hook_call(srv6_manager_get_chunk, loc, client, locator_name, vrf_id); | |
85 | } | |
86 | ||
87 | void srv6_manager_release_locator_chunk_call(struct zserv *client, | |
88 | const char *locator_name, | |
89 | vrf_id_t vrf_id) | |
90 | { | |
91 | hook_call(srv6_manager_release_chunk, client, locator_name, vrf_id); | |
92 | } | |
93 | ||
94 | int srv6_manager_client_disconnect_cb(struct zserv *client) | |
95 | { | |
96 | hook_call(srv6_manager_client_disconnect, client); | |
97 | return 0; | |
98 | } | |
99 | ||
100 | static int zebra_srv6_cleanup(struct zserv *client) | |
101 | { | |
102 | return 0; | |
103 | } | |
104 | ||
105 | void zebra_srv6_locator_add(struct srv6_locator *locator) | |
106 | { | |
107 | struct zebra_srv6 *srv6 = zebra_srv6_get_default(); | |
108 | struct srv6_locator *tmp; | |
f5ca329b HS |
109 | struct listnode *node; |
110 | struct zserv *client; | |
6e68a084 HS |
111 | |
112 | tmp = zebra_srv6_locator_lookup(locator->name); | |
113 | if (!tmp) | |
114 | listnode_add(srv6->locators, locator); | |
f5ca329b HS |
115 | |
116 | /* | |
117 | * Notify new locator info to zclients. | |
118 | * | |
119 | * The srv6 locators and their prefixes are managed by zserv(zebra). | |
120 | * And an actual configuration the srv6 sid in the srv6 locator is done | |
121 | * by zclient(bgpd, isisd, etc). The configuration of each locator | |
122 | * allocation and specify it by zserv and zclient should be | |
123 | * asynchronous. For that, zclient should be received the event via | |
124 | * ZAPI when a srv6 locator is added on zebra. | |
125 | * Basically, in SRv6, adding/removing SRv6 locators is performed less | |
126 | * frequently than adding rib entries, so a broad to all zclients will | |
127 | * not degrade the overall performance of FRRouting. | |
128 | */ | |
129 | for (ALL_LIST_ELEMENTS_RO(zrouter.client_list, node, client)) | |
130 | zsend_zebra_srv6_locator_add(client, locator); | |
6e68a084 HS |
131 | } |
132 | ||
133 | void zebra_srv6_locator_delete(struct srv6_locator *locator) | |
134 | { | |
f5ca329b HS |
135 | struct listnode *n; |
136 | struct srv6_locator_chunk *c; | |
6e68a084 | 137 | struct zebra_srv6 *srv6 = zebra_srv6_get_default(); |
f5ca329b HS |
138 | struct zserv *client; |
139 | ||
140 | /* | |
141 | * Notify deleted locator info to zclients if needed. | |
142 | * | |
143 | * zclient(bgpd,isisd,etc) allocates a sid from srv6 locator chunk and | |
144 | * uses it for its own purpose. For example, in the case of BGP L3VPN, | |
145 | * the SID assigned to vpn unicast rib will be given. | |
146 | * And when the locator is deleted by zserv(zebra), those SIDs need to | |
147 | * be withdrawn. The zclient must initiate the withdrawal of the SIDs | |
148 | * by ZEBRA_SRV6_LOCATOR_DELETE, and this notification is sent to the | |
149 | * owner of each chunk. | |
150 | */ | |
151 | for (ALL_LIST_ELEMENTS_RO((struct list *)locator->chunks, n, c)) { | |
152 | if (c->proto == ZEBRA_ROUTE_SYSTEM) | |
153 | continue; | |
154 | client = zserv_find_client(c->proto, c->instance); | |
155 | if (!client) { | |
156 | zlog_warn( | |
157 | "%s: Not found zclient(proto=%u, instance=%u).", | |
158 | __func__, c->proto, c->instance); | |
159 | continue; | |
160 | } | |
161 | zsend_zebra_srv6_locator_delete(client, locator); | |
162 | } | |
4df9d859 | 163 | |
6e68a084 HS |
164 | listnode_delete(srv6->locators, locator); |
165 | } | |
166 | ||
167 | struct srv6_locator *zebra_srv6_locator_lookup(const char *name) | |
168 | { | |
169 | struct zebra_srv6 *srv6 = zebra_srv6_get_default(); | |
170 | struct srv6_locator *locator; | |
171 | struct listnode *node; | |
172 | ||
173 | for (ALL_LIST_ELEMENTS_RO(srv6->locators, node, locator)) | |
174 | if (!strncmp(name, locator->name, SRV6_LOCNAME_SIZE)) | |
175 | return locator; | |
176 | return NULL; | |
177 | } | |
178 | ||
179 | struct zebra_srv6 *zebra_srv6_get_default(void) | |
180 | { | |
181 | static struct zebra_srv6 srv6; | |
182 | static bool first_execution = true; | |
183 | ||
184 | if (first_execution) { | |
185 | first_execution = false; | |
186 | srv6.locators = list_new(); | |
187 | } | |
188 | return &srv6; | |
189 | } | |
190 | ||
191 | /** | |
192 | * Core function, assigns srv6-locator chunks | |
193 | * | |
194 | * It first searches through the list to check if there's one available | |
195 | * (previously released). Otherwise it creates and assigns a new one | |
196 | * | |
197 | * @param proto Daemon protocol of client, to identify the owner | |
198 | * @param instance Instance, to identify the owner | |
199 | * @param session_id SessionID of client | |
200 | * @param name Name of SRv6-locator | |
201 | * @return Pointer to the assigned srv6-locator chunk, | |
202 | * or NULL if the request could not be satisfied | |
203 | */ | |
204 | static struct srv6_locator * | |
205 | assign_srv6_locator_chunk(uint8_t proto, | |
206 | uint16_t instance, | |
207 | uint32_t session_id, | |
208 | const char *locator_name) | |
209 | { | |
210 | bool chunk_found = false; | |
211 | struct listnode *node = NULL; | |
212 | struct srv6_locator *loc = NULL; | |
213 | struct srv6_locator_chunk *chunk = NULL; | |
214 | ||
215 | loc = zebra_srv6_locator_lookup(locator_name); | |
216 | if (!loc) { | |
217 | zlog_info("%s: locator %s was not found", | |
218 | __func__, locator_name); | |
f6e52a81 | 219 | return NULL; |
6e68a084 HS |
220 | } |
221 | ||
222 | for (ALL_LIST_ELEMENTS_RO((struct list *)loc->chunks, node, chunk)) { | |
f502d7af | 223 | if (chunk->proto != NO_PROTO && chunk->proto != proto) |
6e68a084 HS |
224 | continue; |
225 | chunk_found = true; | |
226 | break; | |
227 | } | |
228 | ||
229 | if (!chunk_found) { | |
230 | zlog_info("%s: locator is already owned", __func__); | |
231 | return NULL; | |
232 | } | |
233 | ||
234 | chunk->proto = proto; | |
f502d7af MS |
235 | chunk->instance = instance; |
236 | chunk->session_id = session_id; | |
6e68a084 HS |
237 | return loc; |
238 | } | |
239 | ||
240 | static int zebra_srv6_manager_get_locator_chunk(struct srv6_locator **loc, | |
241 | struct zserv *client, | |
242 | const char *locator_name, | |
243 | vrf_id_t vrf_id) | |
244 | { | |
4df9d859 HS |
245 | int ret = 0; |
246 | ||
6e68a084 HS |
247 | *loc = assign_srv6_locator_chunk(client->proto, client->instance, |
248 | client->session_id, locator_name); | |
249 | ||
250 | if (!*loc) | |
251 | zlog_err("Unable to assign locator chunk to %s instance %u", | |
252 | zebra_route_string(client->proto), client->instance); | |
253 | else if (IS_ZEBRA_DEBUG_PACKET) | |
254 | zlog_info("Assigned locator chunk %s to %s instance %u", | |
255 | (*loc)->name, zebra_route_string(client->proto), | |
256 | client->instance); | |
257 | ||
1d5f59a2 | 258 | if (*loc && (*loc)->status_up) |
6e68a084 HS |
259 | ret = zsend_srv6_manager_get_locator_chunk_response(client, |
260 | vrf_id, | |
261 | *loc); | |
262 | return ret; | |
263 | } | |
264 | ||
265 | /** | |
266 | * Core function, release no longer used srv6-locator chunks | |
267 | * | |
268 | * @param proto Daemon protocol of client, to identify the owner | |
269 | * @param instance Instance, to identify the owner | |
270 | * @param session_id Zclient session ID, to identify the zclient session | |
271 | * @param locator_name SRv6-locator name, to identify the actual locator | |
272 | * @return 0 on success, -1 otherwise | |
273 | */ | |
274 | static int release_srv6_locator_chunk(uint8_t proto, uint16_t instance, | |
275 | uint32_t session_id, | |
276 | const char *locator_name) | |
277 | { | |
278 | int ret = -1; | |
279 | struct listnode *node; | |
280 | struct srv6_locator_chunk *chunk; | |
281 | struct srv6_locator *loc = NULL; | |
282 | ||
283 | loc = zebra_srv6_locator_lookup(locator_name); | |
4df9d859 | 284 | if (!loc) |
6e68a084 | 285 | return -1; |
6e68a084 HS |
286 | |
287 | if (IS_ZEBRA_DEBUG_PACKET) | |
288 | zlog_debug("%s: Releasing srv6-locator on %s", __func__, | |
289 | locator_name); | |
290 | ||
291 | for (ALL_LIST_ELEMENTS_RO((struct list *)loc->chunks, node, chunk)) { | |
292 | if (chunk->proto != proto || | |
293 | chunk->instance != instance || | |
294 | chunk->session_id != session_id) | |
295 | continue; | |
296 | chunk->proto = NO_PROTO; | |
297 | chunk->instance = 0; | |
298 | chunk->session_id = 0; | |
299 | chunk->keep = 0; | |
300 | ret = 0; | |
301 | break; | |
302 | } | |
303 | ||
304 | if (ret != 0) | |
305 | flog_err(EC_ZEBRA_SRV6M_UNRELEASED_LOCATOR_CHUNK, | |
306 | "%s: SRv6 locator chunk not released", __func__); | |
307 | ||
308 | return ret; | |
309 | } | |
310 | ||
311 | static int zebra_srv6_manager_release_locator_chunk(struct zserv *client, | |
312 | const char *locator_name, | |
313 | vrf_id_t vrf_id) | |
314 | { | |
315 | if (vrf_id != VRF_DEFAULT) { | |
316 | zlog_err("SRv6 locator doesn't support vrf"); | |
317 | return -1; | |
318 | } | |
319 | ||
320 | return release_srv6_locator_chunk(client->proto, client->instance, | |
321 | client->session_id, locator_name); | |
322 | } | |
323 | ||
324 | /** | |
325 | * Release srv6-locator chunks from a client. | |
326 | * | |
327 | * Called on client disconnection or reconnection. It only releases chunks | |
328 | * with empty keep value. | |
329 | * | |
330 | * @param proto Daemon protocol of client, to identify the owner | |
331 | * @param instance Instance, to identify the owner | |
332 | * @return Number of chunks released | |
333 | */ | |
334 | int release_daemon_srv6_locator_chunks(struct zserv *client) | |
335 | { | |
336 | int ret; | |
337 | int count = 0; | |
338 | struct zebra_srv6 *srv6 = zebra_srv6_get_default(); | |
339 | struct listnode *loc_node; | |
340 | struct listnode *chunk_node; | |
341 | struct srv6_locator *loc; | |
342 | struct srv6_locator_chunk *chunk; | |
343 | ||
344 | if (IS_ZEBRA_DEBUG_PACKET) | |
345 | zlog_debug("%s: Releasing chunks for client proto %s, instance %d, session %u", | |
346 | __func__, zebra_route_string(client->proto), | |
347 | client->instance, client->session_id); | |
348 | ||
349 | for (ALL_LIST_ELEMENTS_RO(srv6->locators, loc_node, loc)) { | |
350 | for (ALL_LIST_ELEMENTS_RO(loc->chunks, chunk_node, chunk)) { | |
351 | if (chunk->proto == client->proto && | |
352 | chunk->instance == client->instance && | |
353 | chunk->session_id == client->session_id && | |
354 | chunk->keep == 0) { | |
355 | ret = release_srv6_locator_chunk( | |
356 | chunk->proto, chunk->instance, | |
357 | chunk->session_id, loc->name); | |
358 | if (ret == 0) | |
359 | count++; | |
360 | } | |
361 | } | |
362 | } | |
363 | ||
364 | if (IS_ZEBRA_DEBUG_PACKET) | |
365 | zlog_debug("%s: Released %d srv6-locator chunks", | |
366 | __func__, count); | |
367 | ||
368 | return count; | |
369 | } | |
370 | ||
371 | void zebra_srv6_init(void) | |
372 | { | |
373 | hook_register(zserv_client_close, zebra_srv6_cleanup); | |
374 | hook_register(srv6_manager_get_chunk, | |
375 | zebra_srv6_manager_get_locator_chunk); | |
376 | hook_register(srv6_manager_release_chunk, | |
377 | zebra_srv6_manager_release_locator_chunk); | |
378 | } | |
379 | ||
380 | bool zebra_srv6_is_enable(void) | |
381 | { | |
382 | struct zebra_srv6 *srv6 = zebra_srv6_get_default(); | |
383 | ||
384 | return listcount(srv6->locators); | |
385 | } |