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1 | /* | |
2 | * pim_bfd.c: PIM BFD handling routines | |
3 | * | |
4 | * Copyright (C) 2017 Cumulus Networks, Inc. | |
5 | * Chirag Shah | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; see the file COPYING; if not, write to the | |
19 | * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, | |
20 | * MA 02110-1301 USA | |
21 | */ | |
22 | ||
23 | #include <zebra.h> | |
24 | ||
25 | #include "lib/json.h" | |
26 | #include "command.h" | |
27 | #include "vty.h" | |
28 | #include "zclient.h" | |
29 | ||
30 | #include "pim_instance.h" | |
31 | #include "pim_cmd.h" | |
32 | #include "pim_vty.h" | |
33 | #include "pim_iface.h" | |
34 | #include "pim_bfd.h" | |
35 | #include "bfd.h" | |
36 | #include "pimd.h" | |
37 | #include "pim_zebra.h" | |
38 | ||
39 | /* | |
40 | * pim_bfd_write_config - Write the interface BFD configuration. | |
41 | */ | |
42 | void pim_bfd_write_config(struct vty *vty, struct interface *ifp) | |
43 | { | |
44 | struct pim_interface *pim_ifp = ifp->info; | |
45 | struct bfd_info *bfd_info = NULL; | |
46 | ||
47 | if (!pim_ifp) | |
48 | return; | |
49 | ||
50 | bfd_info = pim_ifp->bfd_info; | |
51 | if (!bfd_info) | |
52 | return; | |
53 | ||
54 | #if HAVE_BFDD == 0 | |
55 | if (CHECK_FLAG(bfd_info->flags, BFD_FLAG_PARAM_CFG)) | |
56 | vty_out(vty, " ip pim bfd %d %d %d\n", bfd_info->detect_mult, | |
57 | bfd_info->required_min_rx, bfd_info->desired_min_tx); | |
58 | else | |
59 | #endif /* ! HAVE_BFDD */ | |
60 | vty_out(vty, " ip pim bfd\n"); | |
61 | } | |
62 | ||
63 | /* | |
64 | * pim_bfd_show_info - Show BFD info structure | |
65 | */ | |
66 | void pim_bfd_show_info(struct vty *vty, void *bfd_info, json_object *json_obj, | |
67 | bool use_json, int param_only) | |
68 | { | |
69 | if (param_only) | |
70 | bfd_show_param(vty, (struct bfd_info *)bfd_info, 1, 0, use_json, | |
71 | json_obj); | |
72 | else | |
73 | bfd_show_info(vty, (struct bfd_info *)bfd_info, 0, 1, use_json, | |
74 | json_obj); | |
75 | } | |
76 | ||
77 | /* | |
78 | * pim_bfd_info_nbr_create - Create/update BFD information for a neighbor. | |
79 | */ | |
80 | void pim_bfd_info_nbr_create(struct pim_interface *pim_ifp, | |
81 | struct pim_neighbor *neigh) | |
82 | { | |
83 | struct bfd_info *nbr_bfd_info = NULL; | |
84 | ||
85 | /* Check if Pim Interface BFD is enabled */ | |
86 | if (!pim_ifp || !pim_ifp->bfd_info) | |
87 | return; | |
88 | ||
89 | if (!neigh->bfd_info) | |
90 | neigh->bfd_info = bfd_info_create(); | |
91 | ||
92 | if (!neigh->bfd_info) | |
93 | return; | |
94 | ||
95 | nbr_bfd_info = neigh->bfd_info; | |
96 | nbr_bfd_info->detect_mult = pim_ifp->bfd_info->detect_mult; | |
97 | nbr_bfd_info->desired_min_tx = pim_ifp->bfd_info->desired_min_tx; | |
98 | nbr_bfd_info->required_min_rx = pim_ifp->bfd_info->required_min_rx; | |
99 | } | |
100 | ||
101 | /* | |
102 | * pim_bfd_info_free - Free BFD info structure | |
103 | */ | |
104 | void pim_bfd_info_free(struct bfd_info **bfd_info) | |
105 | { | |
106 | bfd_info_free(bfd_info); | |
107 | } | |
108 | ||
109 | static void pim_bfd_reg_dereg_nbr(struct pim_neighbor *nbr, int command) | |
110 | { | |
111 | struct pim_interface *pim_ifp = NULL; | |
112 | struct bfd_info *bfd_info = NULL; | |
113 | struct zclient *zclient = NULL; | |
114 | int cbit; | |
115 | ||
116 | zclient = pim_zebra_zclient_get(); | |
117 | ||
118 | if (!nbr) | |
119 | return; | |
120 | pim_ifp = nbr->interface->info; | |
121 | bfd_info = pim_ifp->bfd_info; | |
122 | if (!bfd_info) | |
123 | return; | |
124 | if (PIM_DEBUG_PIM_TRACE) { | |
125 | char str[INET_ADDRSTRLEN]; | |
126 | pim_inet4_dump("<bfd_nbr?>", nbr->source_addr, str, | |
127 | sizeof(str)); | |
128 | zlog_debug("%s Nbr %s %s with BFD", __func__, str, | |
129 | bfd_get_command_dbg_str(command)); | |
130 | } | |
131 | ||
132 | cbit = CHECK_FLAG(bfd_info->flags, BFD_FLAG_BFD_CBIT_ON); | |
133 | ||
134 | bfd_peer_sendmsg(zclient, bfd_info, AF_INET, &nbr->source_addr, NULL, | |
135 | nbr->interface->name, 0, 0, cbit, | |
136 | command, 0, VRF_DEFAULT); | |
137 | } | |
138 | ||
139 | /* | |
140 | * pim_bfd_reg_dereg_all_nbr - Register/Deregister all neighbors associated | |
141 | * with a interface with BFD through | |
142 | * zebra for starting/stopping the monitoring of | |
143 | * the neighbor rechahability. | |
144 | */ | |
145 | int pim_bfd_reg_dereg_all_nbr(struct interface *ifp, int command) | |
146 | { | |
147 | struct pim_interface *pim_ifp = NULL; | |
148 | struct listnode *node = NULL; | |
149 | struct pim_neighbor *neigh = NULL; | |
150 | ||
151 | pim_ifp = ifp->info; | |
152 | if (!pim_ifp) | |
153 | return -1; | |
154 | if (!pim_ifp->bfd_info) | |
155 | return -1; | |
156 | ||
157 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, node, neigh)) { | |
158 | if (command != ZEBRA_BFD_DEST_DEREGISTER) | |
159 | pim_bfd_info_nbr_create(pim_ifp, neigh); | |
160 | else | |
161 | pim_bfd_info_free((struct bfd_info **)&neigh->bfd_info); | |
162 | ||
163 | pim_bfd_reg_dereg_nbr(neigh, command); | |
164 | } | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
169 | /* | |
170 | * pim_bfd_trigger_event - Neighbor is registered/deregistered with BFD when | |
171 | * neighbor state is changed to/from 2way. | |
172 | */ | |
173 | void pim_bfd_trigger_event(struct pim_interface *pim_ifp, | |
174 | struct pim_neighbor *nbr, uint8_t nbr_up) | |
175 | { | |
176 | if (nbr_up) { | |
177 | pim_bfd_info_nbr_create(pim_ifp, nbr); | |
178 | pim_bfd_reg_dereg_nbr(nbr, ZEBRA_BFD_DEST_REGISTER); | |
179 | } else { | |
180 | pim_bfd_info_free(&nbr->bfd_info); | |
181 | pim_bfd_reg_dereg_nbr(nbr, ZEBRA_BFD_DEST_DEREGISTER); | |
182 | } | |
183 | } | |
184 | ||
185 | /* | |
186 | * pim_bfd_if_param_set - Set the configured BFD paramter values for | |
187 | * interface. | |
188 | */ | |
189 | void pim_bfd_if_param_set(struct interface *ifp, uint32_t min_rx, | |
190 | uint32_t min_tx, uint8_t detect_mult, int defaults) | |
191 | { | |
192 | struct pim_interface *pim_ifp = ifp->info; | |
193 | int command = 0; | |
194 | ||
195 | if (!pim_ifp) | |
196 | return; | |
197 | bfd_set_param(&(pim_ifp->bfd_info), min_rx, min_tx, detect_mult, NULL, | |
198 | defaults, &command); | |
199 | ||
200 | if (pim_ifp->bfd_info) { | |
201 | if (PIM_DEBUG_PIM_TRACE) | |
202 | zlog_debug("%s: interface %s has bfd_info", __func__, | |
203 | ifp->name); | |
204 | } | |
205 | if (command) | |
206 | pim_bfd_reg_dereg_all_nbr(ifp, command); | |
207 | } | |
208 | ||
209 | ||
210 | /* | |
211 | * pim_bfd_interface_dest_update - Find the neighbor for which the BFD status | |
212 | * has changed and bring down the neighbor | |
213 | * connectivity if the BFD status changed to | |
214 | * down. | |
215 | */ | |
216 | static int pim_bfd_interface_dest_update(ZAPI_CALLBACK_ARGS) | |
217 | { | |
218 | struct interface *ifp = NULL; | |
219 | struct pim_interface *pim_ifp = NULL; | |
220 | struct prefix p; | |
221 | int status; | |
222 | char msg[100]; | |
223 | int old_status; | |
224 | struct bfd_info *bfd_info = NULL; | |
225 | struct timeval tv; | |
226 | struct listnode *neigh_node = NULL; | |
227 | struct listnode *neigh_nextnode = NULL; | |
228 | struct pim_neighbor *neigh = NULL; | |
229 | ||
230 | ifp = bfd_get_peer_info(zclient->ibuf, &p, NULL, &status, | |
231 | NULL, vrf_id); | |
232 | ||
233 | if ((ifp == NULL) || (p.family != AF_INET)) | |
234 | return 0; | |
235 | ||
236 | pim_ifp = ifp->info; | |
237 | if (!pim_ifp) | |
238 | return 0; | |
239 | ||
240 | if (!pim_ifp->bfd_info) { | |
241 | if (PIM_DEBUG_PIM_TRACE) | |
242 | zlog_debug("%s: pim interface %s BFD is disabled ", | |
243 | __func__, ifp->name); | |
244 | return 0; | |
245 | } | |
246 | ||
247 | if (PIM_DEBUG_PIM_TRACE) { | |
248 | char buf[PREFIX2STR_BUFFER]; | |
249 | prefix2str(&p, buf, sizeof(buf)); | |
250 | zlog_debug("%s: interface %s bfd destination %s %s", __func__, | |
251 | ifp->name, buf, bfd_get_status_str(status)); | |
252 | } | |
253 | ||
254 | for (ALL_LIST_ELEMENTS(pim_ifp->pim_neighbor_list, neigh_node, | |
255 | neigh_nextnode, neigh)) { | |
256 | /* Check neigh address matches with BFD address */ | |
257 | if (neigh->source_addr.s_addr != p.u.prefix4.s_addr) | |
258 | continue; | |
259 | ||
260 | bfd_info = (struct bfd_info *)neigh->bfd_info; | |
261 | if (bfd_info->status == status) { | |
262 | if (PIM_DEBUG_PIM_TRACE) { | |
263 | char str[INET_ADDRSTRLEN]; | |
264 | pim_inet4_dump("<nht_nbr?>", neigh->source_addr, | |
265 | str, sizeof(str)); | |
266 | zlog_debug("%s: bfd status is same for nbr %s", | |
267 | __func__, str); | |
268 | } | |
269 | continue; | |
270 | } | |
271 | old_status = bfd_info->status; | |
272 | BFD_SET_CLIENT_STATUS(bfd_info->status, status); | |
273 | monotime(&tv); | |
274 | bfd_info->last_update = tv.tv_sec; | |
275 | ||
276 | if (PIM_DEBUG_PIM_TRACE) { | |
277 | zlog_debug("%s: status %s old_status %s", __func__, | |
278 | bfd_get_status_str(status), | |
279 | bfd_get_status_str(old_status)); | |
280 | } | |
281 | if ((status == BFD_STATUS_DOWN) | |
282 | && (old_status == BFD_STATUS_UP)) { | |
283 | snprintf(msg, sizeof(msg), "BFD Session Expired"); | |
284 | pim_neighbor_delete(ifp, neigh, msg); | |
285 | } | |
286 | } | |
287 | return 0; | |
288 | } | |
289 | ||
290 | /* | |
291 | * pim_bfd_nbr_replay - Replay all the neighbors that have BFD enabled | |
292 | * to zebra | |
293 | */ | |
294 | static int pim_bfd_nbr_replay(ZAPI_CALLBACK_ARGS) | |
295 | { | |
296 | struct interface *ifp = NULL; | |
297 | struct pim_interface *pim_ifp = NULL; | |
298 | struct pim_neighbor *neigh = NULL; | |
299 | struct listnode *neigh_node; | |
300 | struct listnode *neigh_nextnode; | |
301 | struct vrf *vrf = NULL; | |
302 | ||
303 | /* Send the client registration */ | |
304 | bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_REGISTER, vrf_id); | |
305 | ||
306 | RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name) { | |
307 | FOR_ALL_INTERFACES (vrf, ifp) { | |
308 | pim_ifp = ifp->info; | |
309 | ||
310 | if (!pim_ifp) | |
311 | continue; | |
312 | ||
313 | if (pim_ifp->pim_sock_fd < 0) | |
314 | continue; | |
315 | ||
316 | for (ALL_LIST_ELEMENTS(pim_ifp->pim_neighbor_list, | |
317 | neigh_node, neigh_nextnode, | |
318 | neigh)) { | |
319 | if (!neigh->bfd_info) | |
320 | continue; | |
321 | if (PIM_DEBUG_PIM_TRACE) { | |
322 | char str[INET_ADDRSTRLEN]; | |
323 | ||
324 | pim_inet4_dump("<bfd_nbr?>", | |
325 | neigh->source_addr, str, | |
326 | sizeof(str)); | |
327 | zlog_debug( | |
328 | "%s: Replaying Pim Neigh %s to BFD vrf_id %u", | |
329 | __func__, str, vrf->vrf_id); | |
330 | } | |
331 | pim_bfd_reg_dereg_nbr(neigh, | |
332 | ZEBRA_BFD_DEST_UPDATE); | |
333 | } | |
334 | } | |
335 | } | |
336 | return 0; | |
337 | } | |
338 | ||
339 | void pim_bfd_init(void) | |
340 | { | |
341 | struct zclient *zclient = NULL; | |
342 | ||
343 | zclient = pim_zebra_zclient_get(); | |
344 | ||
345 | bfd_gbl_init(); | |
346 | ||
347 | zclient->interface_bfd_dest_update = pim_bfd_interface_dest_update; | |
348 | zclient->bfd_dest_replay = pim_bfd_nbr_replay; | |
349 | } |