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718e3744 | 1 | /* Main routine of bgpd. |
896014f4 DL |
2 | * Copyright (C) 1996, 97, 98, 1999 Kunihiro Ishiguro |
3 | * | |
4 | * This file is part of GNU Zebra. | |
5 | * | |
6 | * GNU Zebra 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 | * GNU Zebra 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 | */ | |
718e3744 | 20 | |
21 | #include <zebra.h> | |
22 | ||
03014d48 | 23 | #include <pthread.h> |
718e3744 | 24 | #include "vector.h" |
718e3744 | 25 | #include "command.h" |
26 | #include "getopt.h" | |
27 | #include "thread.h" | |
5e4fa164 | 28 | #include <lib/version.h> |
718e3744 | 29 | #include "memory.h" |
fc7948fa | 30 | #include "memory_vty.h" |
718e3744 | 31 | #include "prefix.h" |
32 | #include "log.h" | |
edd7c245 | 33 | #include "privs.h" |
2d75d052 | 34 | #include "sigevent.h" |
228da428 CC |
35 | #include "zclient.h" |
36 | #include "routemap.h" | |
37 | #include "filter.h" | |
38 | #include "plist.h" | |
8196f13d | 39 | #include "stream.h" |
3f9c7369 | 40 | #include "queue.h" |
6a69b354 | 41 | #include "vrf.h" |
567b877d | 42 | #include "bfd.h" |
4f04a76b | 43 | #include "libfrr.h" |
718e3744 | 44 | |
45 | #include "bgpd/bgpd.h" | |
46 | #include "bgpd/bgp_attr.h" | |
b2f0fa55 | 47 | #include "bgpd/bgp_route.h" |
718e3744 | 48 | #include "bgpd/bgp_mplsvpn.h" |
228da428 CC |
49 | #include "bgpd/bgp_aspath.h" |
50 | #include "bgpd/bgp_dump.h" | |
51 | #include "bgpd/bgp_route.h" | |
52 | #include "bgpd/bgp_nexthop.h" | |
53 | #include "bgpd/bgp_regex.h" | |
54 | #include "bgpd/bgp_clist.h" | |
55 | #include "bgpd/bgp_debug.h" | |
56 | #include "bgpd/bgp_filter.h" | |
8196f13d | 57 | #include "bgpd/bgp_zebra.h" |
d3ecc69e | 58 | #include "bgpd/bgp_packet.h" |
03014d48 | 59 | #include "bgpd/bgp_keepalives.h" |
718e3744 | 60 | |
65efcfce | 61 | #ifdef ENABLE_BGP_VNC |
f8b6f499 | 62 | #include "bgpd/rfapi/rfapi_backend.h" |
65efcfce LB |
63 | #endif |
64 | ||
718e3744 | 65 | /* bgpd options, we use GNU getopt library. */ |
d62a17ae | 66 | static const struct option longopts[] = { |
67 | {"bgp_port", required_argument, NULL, 'p'}, | |
68 | {"listenon", required_argument, NULL, 'l'}, | |
69 | {"retain", no_argument, NULL, 'r'}, | |
70 | {"no_kernel", no_argument, NULL, 'n'}, | |
71 | {"skip_runas", no_argument, NULL, 'S'}, | |
72 | {"ecmp", required_argument, NULL, 'e'}, | |
73 | {0}}; | |
718e3744 | 74 | |
2d75d052 | 75 | /* signal definitions */ |
d62a17ae | 76 | void sighup(void); |
77 | void sigint(void); | |
78 | void sigusr1(void); | |
2d75d052 | 79 | |
d62a17ae | 80 | static void bgp_exit(int); |
81 | static void bgp_vrf_terminate(void); | |
228da428 | 82 | |
d62a17ae | 83 | static struct quagga_signal_t bgp_signals[] = { |
84 | { | |
85 | .signal = SIGHUP, | |
86 | .handler = &sighup, | |
87 | }, | |
88 | { | |
89 | .signal = SIGUSR1, | |
90 | .handler = &sigusr1, | |
91 | }, | |
92 | { | |
93 | .signal = SIGINT, | |
94 | .handler = &sigint, | |
95 | }, | |
96 | { | |
97 | .signal = SIGTERM, | |
98 | .handler = &sigint, | |
99 | }, | |
2d75d052 | 100 | }; |
101 | ||
718e3744 | 102 | /* Route retain mode flag. */ |
372b3c70 | 103 | static int retain_mode = 0; |
718e3744 | 104 | |
edd7c245 | 105 | /* privileges */ |
d62a17ae | 106 | static zebra_capabilities_t _caps_p[] = { |
9d303b37 | 107 | ZCAP_BIND, ZCAP_NET_RAW, ZCAP_NET_ADMIN, |
edd7c245 | 108 | }; |
109 | ||
d62a17ae | 110 | struct zebra_privs_t bgpd_privs = { |
b2f36157 | 111 | #if defined(FRR_USER) && defined(FRR_GROUP) |
d62a17ae | 112 | .user = FRR_USER, |
113 | .group = FRR_GROUP, | |
d81fadfd | 114 | #endif |
115 | #ifdef VTY_GROUP | |
d62a17ae | 116 | .vty_group = VTY_GROUP, |
edd7c245 | 117 | #endif |
d62a17ae | 118 | .caps_p = _caps_p, |
119 | .cap_num_p = array_size(_caps_p), | |
120 | .cap_num_i = 0, | |
edd7c245 | 121 | }; |
122 | ||
eb05883f DL |
123 | static struct frr_daemon_info bgpd_di; |
124 | ||
718e3744 | 125 | /* SIGHUP handler. */ |
d62a17ae | 126 | void sighup(void) |
718e3744 | 127 | { |
d62a17ae | 128 | zlog_info("SIGHUP received"); |
718e3744 | 129 | |
d62a17ae | 130 | /* Terminate all thread. */ |
131 | bgp_terminate(); | |
132 | bgp_reset(); | |
133 | zlog_info("bgpd restarting!"); | |
718e3744 | 134 | |
d62a17ae | 135 | /* Reload config file. */ |
136 | vty_read_config(bgpd_di.config_file, config_default); | |
718e3744 | 137 | |
d62a17ae | 138 | /* Try to return to normal operation. */ |
718e3744 | 139 | } |
140 | ||
141 | /* SIGINT handler. */ | |
d62a17ae | 142 | __attribute__((__noreturn__)) void sigint(void) |
718e3744 | 143 | { |
d62a17ae | 144 | zlog_notice("Terminating on signal"); |
718e3744 | 145 | |
8e9e4bd4 | 146 | if (!retain_mode) |
d62a17ae | 147 | bgp_terminate(); |
718e3744 | 148 | |
d62a17ae | 149 | bgp_exit(0); |
540766e7 | 150 | |
d62a17ae | 151 | exit(0); |
718e3744 | 152 | } |
153 | ||
154 | /* SIGUSR1 handler. */ | |
d62a17ae | 155 | void sigusr1(void) |
718e3744 | 156 | { |
d62a17ae | 157 | zlog_rotate(); |
718e3744 | 158 | } |
228da428 CC |
159 | |
160 | /* | |
161 | Try to free up allocations we know about so that diagnostic tools such as | |
162 | valgrind are able to better illuminate leaks. | |
163 | ||
164 | Zebra route removal and protocol teardown are not meant to be done here. | |
165 | For example, "retain_mode" may be set. | |
166 | */ | |
d62a17ae | 167 | static __attribute__((__noreturn__)) void bgp_exit(int status) |
228da428 | 168 | { |
d62a17ae | 169 | struct bgp *bgp; |
170 | struct listnode *node, *nnode; | |
228da428 | 171 | |
d62a17ae | 172 | /* it only makes sense for this to be called on a clean exit */ |
173 | assert(status == 0); | |
228da428 | 174 | |
03951374 DL |
175 | frr_early_fini(); |
176 | ||
d62a17ae | 177 | bfd_gbl_exit(); |
567b877d | 178 | |
d62a17ae | 179 | bgp_close(); |
1ff9a340 | 180 | |
d62a17ae | 181 | /* reverse bgp_master_init */ |
182 | for (ALL_LIST_ELEMENTS(bm->bgp, node, nnode, bgp)) | |
183 | bgp_delete(bgp); | |
46abd3e3 | 184 | |
d62a17ae | 185 | /* reverse bgp_dump_init */ |
186 | bgp_dump_finish(); | |
228da428 | 187 | |
d62a17ae | 188 | /* reverse bgp_route_init */ |
189 | bgp_route_finish(); | |
228da428 | 190 | |
d62a17ae | 191 | /* cleanup route maps */ |
192 | bgp_route_map_terminate(); | |
228da428 | 193 | |
d62a17ae | 194 | /* reverse bgp_attr_init */ |
195 | bgp_attr_finish(); | |
7b8def58 | 196 | |
d62a17ae | 197 | /* reverse access_list_init */ |
198 | access_list_add_hook(NULL); | |
199 | access_list_delete_hook(NULL); | |
200 | access_list_reset(); | |
228da428 | 201 | |
d62a17ae | 202 | /* reverse bgp_filter_init */ |
203 | as_list_add_hook(NULL); | |
204 | as_list_delete_hook(NULL); | |
205 | bgp_filter_reset(); | |
228da428 | 206 | |
d62a17ae | 207 | /* reverse prefix_list_init */ |
208 | prefix_list_add_hook(NULL); | |
209 | prefix_list_delete_hook(NULL); | |
210 | prefix_list_reset(); | |
228da428 | 211 | |
d62a17ae | 212 | /* reverse community_list_init */ |
213 | community_list_terminate(bgp_clist); | |
228da428 | 214 | |
d62a17ae | 215 | bgp_vrf_terminate(); |
65efcfce | 216 | #if ENABLE_BGP_VNC |
d62a17ae | 217 | vnc_zebra_destroy(); |
65efcfce | 218 | #endif |
d62a17ae | 219 | bgp_zebra_destroy(); |
228da428 | 220 | |
affe9e99 | 221 | list_delete_and_null(&bm->bgp); |
d62a17ae | 222 | memset(bm, 0, sizeof(*bm)); |
46857efe | 223 | |
03951374 | 224 | frr_fini(); |
d62a17ae | 225 | exit(status); |
228da428 | 226 | } |
6b0655a2 | 227 | |
d62a17ae | 228 | static int bgp_vrf_new(struct vrf *vrf) |
2fcc254e | 229 | { |
d62a17ae | 230 | if (BGP_DEBUG(zebra, ZEBRA)) |
231 | zlog_debug("VRF Created: %s(%d)", vrf->name, vrf->vrf_id); | |
2fcc254e | 232 | |
d62a17ae | 233 | return 0; |
2fcc254e DS |
234 | } |
235 | ||
d62a17ae | 236 | static int bgp_vrf_delete(struct vrf *vrf) |
2fcc254e | 237 | { |
d62a17ae | 238 | if (BGP_DEBUG(zebra, ZEBRA)) |
239 | zlog_debug("VRF Deletion: %s(%d)", vrf->name, vrf->vrf_id); | |
2fcc254e | 240 | |
d62a17ae | 241 | return 0; |
2fcc254e DS |
242 | } |
243 | ||
d62a17ae | 244 | static int bgp_vrf_enable(struct vrf *vrf) |
2fcc254e | 245 | { |
d62a17ae | 246 | struct bgp *bgp; |
247 | vrf_id_t old_vrf_id; | |
248 | ||
249 | if (BGP_DEBUG(zebra, ZEBRA)) | |
250 | zlog_debug("VRF enable add %s id %d", vrf->name, vrf->vrf_id); | |
251 | ||
252 | bgp = bgp_lookup_by_name(vrf->name); | |
253 | if (bgp) { | |
254 | old_vrf_id = bgp->vrf_id; | |
255 | /* We have instance configured, link to VRF and make it "up". */ | |
256 | bgp_vrf_link(bgp, vrf); | |
257 | ||
258 | /* Update any redistribute vrf bitmaps if the vrf_id changed */ | |
259 | if (old_vrf_id != bgp->vrf_id) | |
260 | bgp_update_redist_vrf_bitmaps(bgp, old_vrf_id); | |
261 | bgp_instance_up(bgp); | |
262 | } | |
263 | ||
264 | return 0; | |
2fcc254e DS |
265 | } |
266 | ||
d62a17ae | 267 | static int bgp_vrf_disable(struct vrf *vrf) |
2fcc254e | 268 | { |
d62a17ae | 269 | struct bgp *bgp; |
270 | vrf_id_t old_vrf_id; | |
271 | ||
272 | if (vrf->vrf_id == VRF_DEFAULT) | |
273 | return 0; | |
274 | ||
275 | if (BGP_DEBUG(zebra, ZEBRA)) | |
276 | zlog_debug("VRF disable %s id %d", vrf->name, vrf->vrf_id); | |
277 | ||
278 | bgp = bgp_lookup_by_name(vrf->name); | |
279 | if (bgp) { | |
280 | old_vrf_id = bgp->vrf_id; | |
281 | /* We have instance configured, unlink from VRF and make it | |
282 | * "down". */ | |
283 | bgp_vrf_unlink(bgp, vrf); | |
284 | /* Update any redistribute vrf bitmaps if the vrf_id changed */ | |
285 | if (old_vrf_id != bgp->vrf_id) | |
286 | bgp_update_redist_vrf_bitmaps(bgp, old_vrf_id); | |
287 | bgp_instance_down(bgp); | |
288 | } | |
289 | ||
290 | /* Note: This is a callback, the VRF will be deleted by the caller. */ | |
291 | return 0; | |
2fcc254e DS |
292 | } |
293 | ||
d62a17ae | 294 | static void bgp_vrf_init(void) |
2fcc254e | 295 | { |
d62a17ae | 296 | vrf_init(bgp_vrf_new, bgp_vrf_enable, bgp_vrf_disable, bgp_vrf_delete); |
2fcc254e DS |
297 | } |
298 | ||
d62a17ae | 299 | static void bgp_vrf_terminate(void) |
021530c1 | 300 | { |
d62a17ae | 301 | vrf_terminate(); |
021530c1 | 302 | } |
303 | ||
d62a17ae | 304 | FRR_DAEMON_INFO(bgpd, BGP, .vty_port = BGP_VTY_PORT, |
4f04a76b | 305 | |
d62a17ae | 306 | .proghelp = "Implementation of the BGP routing protocol.", |
4f04a76b | 307 | |
d62a17ae | 308 | .signals = bgp_signals, .n_signals = array_size(bgp_signals), |
4f04a76b | 309 | |
d62a17ae | 310 | .privs = &bgpd_privs, ) |
4f04a76b | 311 | |
718e3744 | 312 | /* Main routine of bgpd. Treatment of argument and start bgp finite |
313 | state machine is handled at here. */ | |
d62a17ae | 314 | int main(int argc, char **argv) |
718e3744 | 315 | { |
d62a17ae | 316 | int opt; |
317 | int tmp_port; | |
318 | ||
319 | int bgp_port = BGP_PORT_DEFAULT; | |
320 | char *bgp_address = NULL; | |
321 | int no_fib_flag = 0; | |
322 | int skip_runas = 0; | |
323 | ||
324 | frr_preinit(&bgpd_di, argc, argv); | |
325 | frr_opt_add( | |
ae520fc7 | 326 | "p:l:rSne:", longopts, |
d62a17ae | 327 | " -p, --bgp_port Set bgp protocol's port number\n" |
328 | " -l, --listenon Listen on specified address (implies -n)\n" | |
329 | " -r, --retain When program terminates, retain added route by bgpd.\n" | |
330 | " -n, --no_kernel Do not install route to kernel.\n" | |
331 | " -S, --skip_runas Skip capabilities checks, and changing user and group IDs.\n" | |
332 | " -e, --ecmp Specify ECMP to use.\n"); | |
333 | ||
334 | /* Command line argument treatment. */ | |
335 | while (1) { | |
336 | opt = frr_getopt(argc, argv, 0); | |
337 | ||
338 | if (opt == EOF) | |
339 | break; | |
340 | ||
341 | switch (opt) { | |
342 | case 0: | |
343 | break; | |
344 | case 'p': | |
345 | tmp_port = atoi(optarg); | |
346 | if (tmp_port <= 0 || tmp_port > 0xffff) | |
347 | bgp_port = BGP_PORT_DEFAULT; | |
348 | else | |
349 | bgp_port = tmp_port; | |
350 | break; | |
351 | case 'e': | |
352 | multipath_num = atoi(optarg); | |
353 | if (multipath_num > MULTIPATH_NUM | |
354 | || multipath_num <= 0) { | |
355 | zlog_err( | |
356 | "Multipath Number specified must be less than %d and greater than 0", | |
357 | MULTIPATH_NUM); | |
358 | return 1; | |
359 | } | |
360 | break; | |
361 | case 'r': | |
362 | retain_mode = 1; | |
363 | break; | |
364 | case 'l': | |
365 | bgp_address = optarg; | |
366 | /* listenon implies -n */ | |
367 | /* fallthru */ | |
368 | case 'n': | |
369 | no_fib_flag = 1; | |
370 | break; | |
371 | case 'S': | |
372 | skip_runas = 1; | |
373 | break; | |
374 | default: | |
375 | frr_help_exit(1); | |
376 | break; | |
377 | } | |
718e3744 | 378 | } |
d62a17ae | 379 | if (skip_runas) |
380 | memset(&bgpd_privs, 0, sizeof(bgpd_privs)); | |
718e3744 | 381 | |
d62a17ae | 382 | /* BGP master init. */ |
383 | bgp_master_init(frr_init()); | |
384 | bm->port = bgp_port; | |
385 | bm->address = bgp_address; | |
386 | if (no_fib_flag) | |
387 | bgp_option_set(BGP_OPT_NO_FIB); | |
87d4a781 | 388 | |
d62a17ae | 389 | /* Initializations. */ |
390 | bgp_vrf_init(); | |
718e3744 | 391 | |
d62a17ae | 392 | /* BGP related initialization. */ |
393 | bgp_init(); | |
718e3744 | 394 | |
d62a17ae | 395 | snprintf(bgpd_di.startinfo, sizeof(bgpd_di.startinfo), ", bgp@%s:%d", |
396 | (bm->address ? bm->address : "<all>"), bm->port); | |
718e3744 | 397 | |
03014d48 | 398 | pthread_t packet_writes, keepalives; |
d3ecc69e | 399 | pthread_create(&packet_writes, NULL, &peer_writes_start, NULL); |
03014d48 | 400 | pthread_create(&keepalives, NULL, &keepalives_start, NULL); |
d3ecc69e | 401 | |
d62a17ae | 402 | frr_config_fork(); |
403 | frr_run(bm->master); | |
718e3744 | 404 | |
d62a17ae | 405 | /* Not reached. */ |
406 | return (0); | |
718e3744 | 407 | } |