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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" |
61cf4b37 | 44 | #include "ns.h" |
718e3744 | 45 | |
46 | #include "bgpd/bgpd.h" | |
47 | #include "bgpd/bgp_attr.h" | |
b2f0fa55 | 48 | #include "bgpd/bgp_route.h" |
718e3744 | 49 | #include "bgpd/bgp_mplsvpn.h" |
228da428 CC |
50 | #include "bgpd/bgp_aspath.h" |
51 | #include "bgpd/bgp_dump.h" | |
52 | #include "bgpd/bgp_route.h" | |
53 | #include "bgpd/bgp_nexthop.h" | |
54 | #include "bgpd/bgp_regex.h" | |
55 | #include "bgpd/bgp_clist.h" | |
56 | #include "bgpd/bgp_debug.h" | |
57 | #include "bgpd/bgp_filter.h" | |
8196f13d | 58 | #include "bgpd/bgp_zebra.h" |
d3ecc69e | 59 | #include "bgpd/bgp_packet.h" |
03014d48 | 60 | #include "bgpd/bgp_keepalives.h" |
61cf4b37 | 61 | #include "bgpd/bgp_network.h" |
718e3744 | 62 | |
65efcfce | 63 | #ifdef ENABLE_BGP_VNC |
f8b6f499 | 64 | #include "bgpd/rfapi/rfapi_backend.h" |
65efcfce LB |
65 | #endif |
66 | ||
718e3744 | 67 | /* bgpd options, we use GNU getopt library. */ |
d62a17ae | 68 | static const struct option longopts[] = { |
69 | {"bgp_port", required_argument, NULL, 'p'}, | |
70 | {"listenon", required_argument, NULL, 'l'}, | |
71 | {"retain", no_argument, NULL, 'r'}, | |
72 | {"no_kernel", no_argument, NULL, 'n'}, | |
73 | {"skip_runas", no_argument, NULL, 'S'}, | |
74 | {"ecmp", required_argument, NULL, 'e'}, | |
75 | {0}}; | |
718e3744 | 76 | |
2d75d052 | 77 | /* signal definitions */ |
d62a17ae | 78 | void sighup(void); |
79 | void sigint(void); | |
80 | void sigusr1(void); | |
2d75d052 | 81 | |
d62a17ae | 82 | static void bgp_exit(int); |
83 | static void bgp_vrf_terminate(void); | |
228da428 | 84 | |
d62a17ae | 85 | static struct quagga_signal_t bgp_signals[] = { |
86 | { | |
87 | .signal = SIGHUP, | |
88 | .handler = &sighup, | |
89 | }, | |
90 | { | |
91 | .signal = SIGUSR1, | |
92 | .handler = &sigusr1, | |
93 | }, | |
94 | { | |
95 | .signal = SIGINT, | |
96 | .handler = &sigint, | |
97 | }, | |
98 | { | |
99 | .signal = SIGTERM, | |
100 | .handler = &sigint, | |
101 | }, | |
2d75d052 | 102 | }; |
103 | ||
718e3744 | 104 | /* Route retain mode flag. */ |
372b3c70 | 105 | static int retain_mode = 0; |
718e3744 | 106 | |
edd7c245 | 107 | /* privileges */ |
996c9314 LB |
108 | static zebra_capabilities_t _caps_p[] = {ZCAP_BIND, ZCAP_NET_RAW, |
109 | ZCAP_NET_ADMIN, ZCAP_SYS_ADMIN}; | |
edd7c245 | 110 | |
d62a17ae | 111 | struct zebra_privs_t bgpd_privs = { |
b2f36157 | 112 | #if defined(FRR_USER) && defined(FRR_GROUP) |
d62a17ae | 113 | .user = FRR_USER, |
114 | .group = FRR_GROUP, | |
d81fadfd | 115 | #endif |
116 | #ifdef VTY_GROUP | |
d62a17ae | 117 | .vty_group = VTY_GROUP, |
edd7c245 | 118 | #endif |
d62a17ae | 119 | .caps_p = _caps_p, |
120 | .cap_num_p = array_size(_caps_p), | |
121 | .cap_num_i = 0, | |
edd7c245 | 122 | }; |
123 | ||
eb05883f DL |
124 | static struct frr_daemon_info bgpd_di; |
125 | ||
718e3744 | 126 | /* SIGHUP handler. */ |
d62a17ae | 127 | void sighup(void) |
718e3744 | 128 | { |
d62a17ae | 129 | zlog_info("SIGHUP received"); |
718e3744 | 130 | |
d62a17ae | 131 | /* Terminate all thread. */ |
132 | bgp_terminate(); | |
133 | bgp_reset(); | |
134 | zlog_info("bgpd restarting!"); | |
718e3744 | 135 | |
d62a17ae | 136 | /* Reload config file. */ |
137 | vty_read_config(bgpd_di.config_file, config_default); | |
718e3744 | 138 | |
d62a17ae | 139 | /* Try to return to normal operation. */ |
718e3744 | 140 | } |
141 | ||
142 | /* SIGINT handler. */ | |
d62a17ae | 143 | __attribute__((__noreturn__)) void sigint(void) |
718e3744 | 144 | { |
d62a17ae | 145 | zlog_notice("Terminating on signal"); |
718e3744 | 146 | |
8e9e4bd4 | 147 | if (!retain_mode) |
d62a17ae | 148 | bgp_terminate(); |
718e3744 | 149 | |
d62a17ae | 150 | bgp_exit(0); |
540766e7 | 151 | |
d62a17ae | 152 | exit(0); |
718e3744 | 153 | } |
154 | ||
155 | /* SIGUSR1 handler. */ | |
d62a17ae | 156 | void sigusr1(void) |
718e3744 | 157 | { |
d62a17ae | 158 | zlog_rotate(); |
718e3744 | 159 | } |
228da428 CC |
160 | |
161 | /* | |
162 | Try to free up allocations we know about so that diagnostic tools such as | |
163 | valgrind are able to better illuminate leaks. | |
164 | ||
165 | Zebra route removal and protocol teardown are not meant to be done here. | |
166 | For example, "retain_mode" may be set. | |
167 | */ | |
d62a17ae | 168 | static __attribute__((__noreturn__)) void bgp_exit(int status) |
228da428 | 169 | { |
d62a17ae | 170 | struct bgp *bgp; |
171 | struct listnode *node, *nnode; | |
228da428 | 172 | |
d62a17ae | 173 | /* it only makes sense for this to be called on a clean exit */ |
174 | assert(status == 0); | |
228da428 | 175 | |
03951374 DL |
176 | frr_early_fini(); |
177 | ||
d62a17ae | 178 | bfd_gbl_exit(); |
567b877d | 179 | |
d62a17ae | 180 | bgp_close(); |
1ff9a340 | 181 | |
d62a17ae | 182 | /* reverse bgp_master_init */ |
183 | for (ALL_LIST_ELEMENTS(bm->bgp, node, nnode, bgp)) | |
184 | bgp_delete(bgp); | |
46abd3e3 | 185 | |
d62a17ae | 186 | /* reverse bgp_dump_init */ |
187 | bgp_dump_finish(); | |
228da428 | 188 | |
d62a17ae | 189 | /* reverse bgp_route_init */ |
190 | bgp_route_finish(); | |
228da428 | 191 | |
d62a17ae | 192 | /* cleanup route maps */ |
193 | bgp_route_map_terminate(); | |
228da428 | 194 | |
d62a17ae | 195 | /* reverse bgp_attr_init */ |
196 | bgp_attr_finish(); | |
7b8def58 | 197 | |
2d4ee774 QY |
198 | /* stop pthreads */ |
199 | bgp_pthreads_finish(); | |
200 | ||
d62a17ae | 201 | /* reverse access_list_init */ |
202 | access_list_add_hook(NULL); | |
203 | access_list_delete_hook(NULL); | |
204 | access_list_reset(); | |
228da428 | 205 | |
d62a17ae | 206 | /* reverse bgp_filter_init */ |
207 | as_list_add_hook(NULL); | |
208 | as_list_delete_hook(NULL); | |
209 | bgp_filter_reset(); | |
228da428 | 210 | |
d62a17ae | 211 | /* reverse prefix_list_init */ |
212 | prefix_list_add_hook(NULL); | |
213 | prefix_list_delete_hook(NULL); | |
214 | prefix_list_reset(); | |
228da428 | 215 | |
d62a17ae | 216 | /* reverse community_list_init */ |
217 | community_list_terminate(bgp_clist); | |
228da428 | 218 | |
d62a17ae | 219 | bgp_vrf_terminate(); |
65efcfce | 220 | #if ENABLE_BGP_VNC |
d62a17ae | 221 | vnc_zebra_destroy(); |
65efcfce | 222 | #endif |
d62a17ae | 223 | bgp_zebra_destroy(); |
228da428 | 224 | |
3d57c994 | 225 | bf_free(bm->rd_idspace); |
affe9e99 | 226 | list_delete_and_null(&bm->bgp); |
d62a17ae | 227 | memset(bm, 0, sizeof(*bm)); |
46857efe | 228 | |
03951374 | 229 | frr_fini(); |
d62a17ae | 230 | exit(status); |
228da428 | 231 | } |
6b0655a2 | 232 | |
d62a17ae | 233 | static int bgp_vrf_new(struct vrf *vrf) |
2fcc254e | 234 | { |
d62a17ae | 235 | if (BGP_DEBUG(zebra, ZEBRA)) |
a8bf7d9c | 236 | zlog_debug("VRF Created: %s(%u)", vrf->name, vrf->vrf_id); |
2fcc254e | 237 | |
d62a17ae | 238 | return 0; |
2fcc254e DS |
239 | } |
240 | ||
d62a17ae | 241 | static int bgp_vrf_delete(struct vrf *vrf) |
2fcc254e | 242 | { |
d62a17ae | 243 | if (BGP_DEBUG(zebra, ZEBRA)) |
a8bf7d9c | 244 | zlog_debug("VRF Deletion: %s(%u)", vrf->name, vrf->vrf_id); |
2fcc254e | 245 | |
d62a17ae | 246 | return 0; |
2fcc254e DS |
247 | } |
248 | ||
d62a17ae | 249 | static int bgp_vrf_enable(struct vrf *vrf) |
2fcc254e | 250 | { |
d62a17ae | 251 | struct bgp *bgp; |
252 | vrf_id_t old_vrf_id; | |
253 | ||
254 | if (BGP_DEBUG(zebra, ZEBRA)) | |
a8bf7d9c | 255 | zlog_debug("VRF enable add %s id %u", vrf->name, vrf->vrf_id); |
d62a17ae | 256 | |
257 | bgp = bgp_lookup_by_name(vrf->name); | |
258 | if (bgp) { | |
259 | old_vrf_id = bgp->vrf_id; | |
260 | /* We have instance configured, link to VRF and make it "up". */ | |
261 | bgp_vrf_link(bgp, vrf); | |
262 | ||
e5619c28 | 263 | bgp_handle_socket(bgp, vrf, old_vrf_id, true); |
d62a17ae | 264 | /* Update any redistribute vrf bitmaps if the vrf_id changed */ |
265 | if (old_vrf_id != bgp->vrf_id) | |
266 | bgp_update_redist_vrf_bitmaps(bgp, old_vrf_id); | |
267 | bgp_instance_up(bgp); | |
ddb5b488 PZ |
268 | vpn_leak_zebra_vrf_label_update(bgp, AFI_IP); |
269 | vpn_leak_zebra_vrf_label_update(bgp, AFI_IP6); | |
d62a17ae | 270 | } |
271 | ||
272 | return 0; | |
2fcc254e DS |
273 | } |
274 | ||
d62a17ae | 275 | static int bgp_vrf_disable(struct vrf *vrf) |
2fcc254e | 276 | { |
d62a17ae | 277 | struct bgp *bgp; |
278 | vrf_id_t old_vrf_id; | |
279 | ||
280 | if (vrf->vrf_id == VRF_DEFAULT) | |
281 | return 0; | |
282 | ||
283 | if (BGP_DEBUG(zebra, ZEBRA)) | |
284 | zlog_debug("VRF disable %s id %d", vrf->name, vrf->vrf_id); | |
285 | ||
286 | bgp = bgp_lookup_by_name(vrf->name); | |
287 | if (bgp) { | |
ddb5b488 PZ |
288 | |
289 | vpn_leak_zebra_vrf_label_withdraw(bgp, AFI_IP); | |
290 | vpn_leak_zebra_vrf_label_withdraw(bgp, AFI_IP6); | |
291 | ||
d62a17ae | 292 | old_vrf_id = bgp->vrf_id; |
e5619c28 | 293 | bgp_handle_socket(bgp, vrf, VRF_UNKNOWN, false); |
d62a17ae | 294 | /* We have instance configured, unlink from VRF and make it |
295 | * "down". */ | |
296 | bgp_vrf_unlink(bgp, vrf); | |
297 | /* Update any redistribute vrf bitmaps if the vrf_id changed */ | |
298 | if (old_vrf_id != bgp->vrf_id) | |
299 | bgp_update_redist_vrf_bitmaps(bgp, old_vrf_id); | |
300 | bgp_instance_down(bgp); | |
301 | } | |
302 | ||
303 | /* Note: This is a callback, the VRF will be deleted by the caller. */ | |
304 | return 0; | |
2fcc254e DS |
305 | } |
306 | ||
d62a17ae | 307 | static void bgp_vrf_init(void) |
2fcc254e | 308 | { |
d62a17ae | 309 | vrf_init(bgp_vrf_new, bgp_vrf_enable, bgp_vrf_disable, bgp_vrf_delete); |
2fcc254e DS |
310 | } |
311 | ||
d62a17ae | 312 | static void bgp_vrf_terminate(void) |
021530c1 | 313 | { |
d62a17ae | 314 | vrf_terminate(); |
021530c1 | 315 | } |
316 | ||
d62a17ae | 317 | FRR_DAEMON_INFO(bgpd, BGP, .vty_port = BGP_VTY_PORT, |
4f04a76b | 318 | |
d62a17ae | 319 | .proghelp = "Implementation of the BGP routing protocol.", |
4f04a76b | 320 | |
d62a17ae | 321 | .signals = bgp_signals, .n_signals = array_size(bgp_signals), |
4f04a76b | 322 | |
d62a17ae | 323 | .privs = &bgpd_privs, ) |
4f04a76b | 324 | |
718e3744 | 325 | /* Main routine of bgpd. Treatment of argument and start bgp finite |
326 | state machine is handled at here. */ | |
d62a17ae | 327 | int main(int argc, char **argv) |
718e3744 | 328 | { |
d62a17ae | 329 | int opt; |
330 | int tmp_port; | |
331 | ||
332 | int bgp_port = BGP_PORT_DEFAULT; | |
333 | char *bgp_address = NULL; | |
334 | int no_fib_flag = 0; | |
335 | int skip_runas = 0; | |
336 | ||
337 | frr_preinit(&bgpd_di, argc, argv); | |
338 | frr_opt_add( | |
ae520fc7 | 339 | "p:l:rSne:", longopts, |
580f8636 | 340 | " -p, --bgp_port Set BGP listen port number (0 means do not listen).\n" |
d62a17ae | 341 | " -l, --listenon Listen on specified address (implies -n)\n" |
342 | " -r, --retain When program terminates, retain added route by bgpd.\n" | |
343 | " -n, --no_kernel Do not install route to kernel.\n" | |
344 | " -S, --skip_runas Skip capabilities checks, and changing user and group IDs.\n" | |
345 | " -e, --ecmp Specify ECMP to use.\n"); | |
346 | ||
347 | /* Command line argument treatment. */ | |
348 | while (1) { | |
349 | opt = frr_getopt(argc, argv, 0); | |
350 | ||
351 | if (opt == EOF) | |
352 | break; | |
353 | ||
354 | switch (opt) { | |
355 | case 0: | |
356 | break; | |
357 | case 'p': | |
358 | tmp_port = atoi(optarg); | |
580f8636 | 359 | if (tmp_port < 0 || tmp_port > 0xffff) |
d62a17ae | 360 | bgp_port = BGP_PORT_DEFAULT; |
361 | else | |
362 | bgp_port = tmp_port; | |
363 | break; | |
364 | case 'e': | |
365 | multipath_num = atoi(optarg); | |
366 | if (multipath_num > MULTIPATH_NUM | |
367 | || multipath_num <= 0) { | |
368 | zlog_err( | |
369 | "Multipath Number specified must be less than %d and greater than 0", | |
370 | MULTIPATH_NUM); | |
371 | return 1; | |
372 | } | |
373 | break; | |
374 | case 'r': | |
375 | retain_mode = 1; | |
376 | break; | |
377 | case 'l': | |
378 | bgp_address = optarg; | |
379 | /* listenon implies -n */ | |
380 | /* fallthru */ | |
381 | case 'n': | |
382 | no_fib_flag = 1; | |
383 | break; | |
384 | case 'S': | |
385 | skip_runas = 1; | |
386 | break; | |
387 | default: | |
388 | frr_help_exit(1); | |
389 | break; | |
390 | } | |
718e3744 | 391 | } |
d62a17ae | 392 | if (skip_runas) |
393 | memset(&bgpd_privs, 0, sizeof(bgpd_privs)); | |
718e3744 | 394 | |
d62a17ae | 395 | /* BGP master init. */ |
396 | bgp_master_init(frr_init()); | |
397 | bm->port = bgp_port; | |
580f8636 | 398 | if (bgp_port == 0) |
399 | bgp_option_set(BGP_OPT_NO_LISTEN); | |
d62a17ae | 400 | bm->address = bgp_address; |
401 | if (no_fib_flag) | |
402 | bgp_option_set(BGP_OPT_NO_FIB); | |
87d4a781 | 403 | |
d62a17ae | 404 | /* Initializations. */ |
405 | bgp_vrf_init(); | |
718e3744 | 406 | |
d62a17ae | 407 | /* BGP related initialization. */ |
408 | bgp_init(); | |
718e3744 | 409 | |
d62a17ae | 410 | snprintf(bgpd_di.startinfo, sizeof(bgpd_di.startinfo), ", bgp@%s:%d", |
411 | (bm->address ? bm->address : "<all>"), bm->port); | |
718e3744 | 412 | |
d62a17ae | 413 | frr_config_fork(); |
2d4ee774 | 414 | /* must be called after fork() */ |
419dfe6a | 415 | bgp_pthreads_run(); |
d62a17ae | 416 | frr_run(bm->master); |
718e3744 | 417 | |
d62a17ae | 418 | /* Not reached. */ |
419 | return (0); | |
718e3744 | 420 | } |