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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 | ||
23 | #include "vector.h" | |
718e3744 | 24 | #include "command.h" |
25 | #include "getopt.h" | |
26 | #include "thread.h" | |
5e4fa164 | 27 | #include <lib/version.h> |
718e3744 | 28 | #include "memory.h" |
fc7948fa | 29 | #include "memory_vty.h" |
718e3744 | 30 | #include "prefix.h" |
31 | #include "log.h" | |
edd7c245 | 32 | #include "privs.h" |
2d75d052 | 33 | #include "sigevent.h" |
228da428 CC |
34 | #include "zclient.h" |
35 | #include "routemap.h" | |
36 | #include "filter.h" | |
37 | #include "plist.h" | |
8196f13d | 38 | #include "stream.h" |
3f9c7369 | 39 | #include "queue.h" |
6a69b354 | 40 | #include "vrf.h" |
567b877d | 41 | #include "bfd.h" |
4f04a76b | 42 | #include "libfrr.h" |
718e3744 | 43 | |
44 | #include "bgpd/bgpd.h" | |
45 | #include "bgpd/bgp_attr.h" | |
b2f0fa55 | 46 | #include "bgpd/bgp_route.h" |
718e3744 | 47 | #include "bgpd/bgp_mplsvpn.h" |
228da428 CC |
48 | #include "bgpd/bgp_aspath.h" |
49 | #include "bgpd/bgp_dump.h" | |
50 | #include "bgpd/bgp_route.h" | |
51 | #include "bgpd/bgp_nexthop.h" | |
52 | #include "bgpd/bgp_regex.h" | |
53 | #include "bgpd/bgp_clist.h" | |
54 | #include "bgpd/bgp_debug.h" | |
55 | #include "bgpd/bgp_filter.h" | |
8196f13d | 56 | #include "bgpd/bgp_zebra.h" |
718e3744 | 57 | |
65efcfce | 58 | #ifdef ENABLE_BGP_VNC |
f8b6f499 | 59 | #include "bgpd/rfapi/rfapi_backend.h" |
65efcfce LB |
60 | #endif |
61 | ||
718e3744 | 62 | /* bgpd options, we use GNU getopt library. */ |
d62a17ae | 63 | static const struct option longopts[] = { |
64 | {"bgp_port", required_argument, NULL, 'p'}, | |
65 | {"listenon", required_argument, NULL, 'l'}, | |
66 | {"retain", no_argument, NULL, 'r'}, | |
67 | {"no_kernel", no_argument, NULL, 'n'}, | |
68 | {"skip_runas", no_argument, NULL, 'S'}, | |
69 | {"ecmp", required_argument, NULL, 'e'}, | |
70 | {0}}; | |
718e3744 | 71 | |
2d75d052 | 72 | /* signal definitions */ |
d62a17ae | 73 | void sighup(void); |
74 | void sigint(void); | |
75 | void sigusr1(void); | |
2d75d052 | 76 | |
d62a17ae | 77 | static void bgp_exit(int); |
78 | static void bgp_vrf_terminate(void); | |
228da428 | 79 | |
d62a17ae | 80 | static struct quagga_signal_t bgp_signals[] = { |
81 | { | |
82 | .signal = SIGHUP, | |
83 | .handler = &sighup, | |
84 | }, | |
85 | { | |
86 | .signal = SIGUSR1, | |
87 | .handler = &sigusr1, | |
88 | }, | |
89 | { | |
90 | .signal = SIGINT, | |
91 | .handler = &sigint, | |
92 | }, | |
93 | { | |
94 | .signal = SIGTERM, | |
95 | .handler = &sigint, | |
96 | }, | |
2d75d052 | 97 | }; |
98 | ||
718e3744 | 99 | /* Route retain mode flag. */ |
372b3c70 | 100 | static int retain_mode = 0; |
718e3744 | 101 | |
edd7c245 | 102 | /* privileges */ |
d62a17ae | 103 | static zebra_capabilities_t _caps_p[] = { |
9d303b37 | 104 | ZCAP_BIND, ZCAP_NET_RAW, ZCAP_NET_ADMIN, |
edd7c245 | 105 | }; |
106 | ||
d62a17ae | 107 | struct zebra_privs_t bgpd_privs = { |
b2f36157 | 108 | #if defined(FRR_USER) && defined(FRR_GROUP) |
d62a17ae | 109 | .user = FRR_USER, |
110 | .group = FRR_GROUP, | |
d81fadfd | 111 | #endif |
112 | #ifdef VTY_GROUP | |
d62a17ae | 113 | .vty_group = VTY_GROUP, |
edd7c245 | 114 | #endif |
d62a17ae | 115 | .caps_p = _caps_p, |
116 | .cap_num_p = array_size(_caps_p), | |
117 | .cap_num_i = 0, | |
edd7c245 | 118 | }; |
119 | ||
eb05883f DL |
120 | static struct frr_daemon_info bgpd_di; |
121 | ||
718e3744 | 122 | /* SIGHUP handler. */ |
d62a17ae | 123 | void sighup(void) |
718e3744 | 124 | { |
d62a17ae | 125 | zlog_info("SIGHUP received"); |
718e3744 | 126 | |
d62a17ae | 127 | /* Terminate all thread. */ |
128 | bgp_terminate(); | |
129 | bgp_reset(); | |
130 | zlog_info("bgpd restarting!"); | |
718e3744 | 131 | |
d62a17ae | 132 | /* Reload config file. */ |
133 | vty_read_config(bgpd_di.config_file, config_default); | |
718e3744 | 134 | |
d62a17ae | 135 | /* Try to return to normal operation. */ |
718e3744 | 136 | } |
137 | ||
138 | /* SIGINT handler. */ | |
d62a17ae | 139 | __attribute__((__noreturn__)) void sigint(void) |
718e3744 | 140 | { |
d62a17ae | 141 | zlog_notice("Terminating on signal"); |
718e3744 | 142 | |
d62a17ae | 143 | if (!retain_mode) { |
144 | bgp_terminate(); | |
145 | if (bgpd_privs.user) /* NULL if skip_runas flag set */ | |
146 | zprivs_terminate(&bgpd_privs); | |
147 | } | |
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 | |
d62a17ae | 175 | bfd_gbl_exit(); |
567b877d | 176 | |
d62a17ae | 177 | bgp_close(); |
1ff9a340 | 178 | |
d62a17ae | 179 | if (retain_mode) |
180 | if_add_hook(IF_DELETE_HOOK, NULL); | |
ad4cbda1 | 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 | |
d62a17ae | 198 | /* reverse access_list_init */ |
199 | access_list_add_hook(NULL); | |
200 | access_list_delete_hook(NULL); | |
201 | access_list_reset(); | |
228da428 | 202 | |
d62a17ae | 203 | /* reverse bgp_filter_init */ |
204 | as_list_add_hook(NULL); | |
205 | as_list_delete_hook(NULL); | |
206 | bgp_filter_reset(); | |
228da428 | 207 | |
d62a17ae | 208 | /* reverse prefix_list_init */ |
209 | prefix_list_add_hook(NULL); | |
210 | prefix_list_delete_hook(NULL); | |
211 | prefix_list_reset(); | |
228da428 | 212 | |
d62a17ae | 213 | /* reverse community_list_init */ |
214 | community_list_terminate(bgp_clist); | |
228da428 | 215 | |
d62a17ae | 216 | bgp_vrf_terminate(); |
217 | cmd_terminate(); | |
218 | vty_terminate(); | |
65efcfce | 219 | #if ENABLE_BGP_VNC |
d62a17ae | 220 | vnc_zebra_destroy(); |
65efcfce | 221 | #endif |
d62a17ae | 222 | bgp_zebra_destroy(); |
228da428 | 223 | |
d62a17ae | 224 | /* reverse bgp_master_init */ |
225 | if (bm->master) | |
226 | thread_master_free(bm->master); | |
228da428 | 227 | |
d62a17ae | 228 | closezlog(); |
228da428 | 229 | |
d62a17ae | 230 | list_delete(bm->bgp); |
231 | memset(bm, 0, sizeof(*bm)); | |
46857efe | 232 | |
d62a17ae | 233 | if (bgp_debug_count()) |
234 | log_memstats_stderr("bgpd"); | |
235 | exit(status); | |
228da428 | 236 | } |
6b0655a2 | 237 | |
d62a17ae | 238 | static int bgp_vrf_new(struct vrf *vrf) |
2fcc254e | 239 | { |
d62a17ae | 240 | if (BGP_DEBUG(zebra, ZEBRA)) |
241 | zlog_debug("VRF Created: %s(%d)", vrf->name, vrf->vrf_id); | |
2fcc254e | 242 | |
d62a17ae | 243 | return 0; |
2fcc254e DS |
244 | } |
245 | ||
d62a17ae | 246 | static int bgp_vrf_delete(struct vrf *vrf) |
2fcc254e | 247 | { |
d62a17ae | 248 | if (BGP_DEBUG(zebra, ZEBRA)) |
249 | zlog_debug("VRF Deletion: %s(%d)", vrf->name, vrf->vrf_id); | |
2fcc254e | 250 | |
d62a17ae | 251 | return 0; |
2fcc254e DS |
252 | } |
253 | ||
d62a17ae | 254 | static int bgp_vrf_enable(struct vrf *vrf) |
2fcc254e | 255 | { |
d62a17ae | 256 | struct bgp *bgp; |
257 | vrf_id_t old_vrf_id; | |
258 | ||
259 | if (BGP_DEBUG(zebra, ZEBRA)) | |
260 | zlog_debug("VRF enable add %s id %d", vrf->name, vrf->vrf_id); | |
261 | ||
262 | bgp = bgp_lookup_by_name(vrf->name); | |
263 | if (bgp) { | |
264 | old_vrf_id = bgp->vrf_id; | |
265 | /* We have instance configured, link to VRF and make it "up". */ | |
266 | bgp_vrf_link(bgp, vrf); | |
267 | ||
268 | /* Update any redistribute vrf bitmaps if the vrf_id changed */ | |
269 | if (old_vrf_id != bgp->vrf_id) | |
270 | bgp_update_redist_vrf_bitmaps(bgp, old_vrf_id); | |
271 | bgp_instance_up(bgp); | |
272 | } | |
273 | ||
274 | return 0; | |
2fcc254e DS |
275 | } |
276 | ||
d62a17ae | 277 | static int bgp_vrf_disable(struct vrf *vrf) |
2fcc254e | 278 | { |
d62a17ae | 279 | struct bgp *bgp; |
280 | vrf_id_t old_vrf_id; | |
281 | ||
282 | if (vrf->vrf_id == VRF_DEFAULT) | |
283 | return 0; | |
284 | ||
285 | if (BGP_DEBUG(zebra, ZEBRA)) | |
286 | zlog_debug("VRF disable %s id %d", vrf->name, vrf->vrf_id); | |
287 | ||
288 | bgp = bgp_lookup_by_name(vrf->name); | |
289 | if (bgp) { | |
290 | old_vrf_id = bgp->vrf_id; | |
291 | /* We have instance configured, unlink from VRF and make it | |
292 | * "down". */ | |
293 | bgp_vrf_unlink(bgp, vrf); | |
294 | /* Update any redistribute vrf bitmaps if the vrf_id changed */ | |
295 | if (old_vrf_id != bgp->vrf_id) | |
296 | bgp_update_redist_vrf_bitmaps(bgp, old_vrf_id); | |
297 | bgp_instance_down(bgp); | |
298 | } | |
299 | ||
300 | /* Note: This is a callback, the VRF will be deleted by the caller. */ | |
301 | return 0; | |
2fcc254e DS |
302 | } |
303 | ||
d62a17ae | 304 | static void bgp_vrf_init(void) |
2fcc254e | 305 | { |
d62a17ae | 306 | vrf_init(bgp_vrf_new, bgp_vrf_enable, bgp_vrf_disable, bgp_vrf_delete); |
2fcc254e DS |
307 | } |
308 | ||
d62a17ae | 309 | static void bgp_vrf_terminate(void) |
021530c1 | 310 | { |
d62a17ae | 311 | vrf_terminate(); |
021530c1 | 312 | } |
313 | ||
d62a17ae | 314 | FRR_DAEMON_INFO(bgpd, BGP, .vty_port = BGP_VTY_PORT, |
4f04a76b | 315 | |
d62a17ae | 316 | .proghelp = "Implementation of the BGP routing protocol.", |
4f04a76b | 317 | |
d62a17ae | 318 | .signals = bgp_signals, .n_signals = array_size(bgp_signals), |
4f04a76b | 319 | |
d62a17ae | 320 | .privs = &bgpd_privs, ) |
4f04a76b | 321 | |
718e3744 | 322 | /* Main routine of bgpd. Treatment of argument and start bgp finite |
323 | state machine is handled at here. */ | |
d62a17ae | 324 | int main(int argc, char **argv) |
718e3744 | 325 | { |
d62a17ae | 326 | int opt; |
327 | int tmp_port; | |
328 | ||
329 | int bgp_port = BGP_PORT_DEFAULT; | |
330 | char *bgp_address = NULL; | |
331 | int no_fib_flag = 0; | |
332 | int skip_runas = 0; | |
333 | ||
334 | frr_preinit(&bgpd_di, argc, argv); | |
335 | frr_opt_add( | |
336 | "p:l:rne:", longopts, | |
337 | " -p, --bgp_port Set bgp protocol's port number\n" | |
338 | " -l, --listenon Listen on specified address (implies -n)\n" | |
339 | " -r, --retain When program terminates, retain added route by bgpd.\n" | |
340 | " -n, --no_kernel Do not install route to kernel.\n" | |
341 | " -S, --skip_runas Skip capabilities checks, and changing user and group IDs.\n" | |
342 | " -e, --ecmp Specify ECMP to use.\n"); | |
343 | ||
344 | /* Command line argument treatment. */ | |
345 | while (1) { | |
346 | opt = frr_getopt(argc, argv, 0); | |
347 | ||
348 | if (opt == EOF) | |
349 | break; | |
350 | ||
351 | switch (opt) { | |
352 | case 0: | |
353 | break; | |
354 | case 'p': | |
355 | tmp_port = atoi(optarg); | |
356 | if (tmp_port <= 0 || tmp_port > 0xffff) | |
357 | bgp_port = BGP_PORT_DEFAULT; | |
358 | else | |
359 | bgp_port = tmp_port; | |
360 | break; | |
361 | case 'e': | |
362 | multipath_num = atoi(optarg); | |
363 | if (multipath_num > MULTIPATH_NUM | |
364 | || multipath_num <= 0) { | |
365 | zlog_err( | |
366 | "Multipath Number specified must be less than %d and greater than 0", | |
367 | MULTIPATH_NUM); | |
368 | return 1; | |
369 | } | |
370 | break; | |
371 | case 'r': | |
372 | retain_mode = 1; | |
373 | break; | |
374 | case 'l': | |
375 | bgp_address = optarg; | |
376 | /* listenon implies -n */ | |
377 | /* fallthru */ | |
378 | case 'n': | |
379 | no_fib_flag = 1; | |
380 | break; | |
381 | case 'S': | |
382 | skip_runas = 1; | |
383 | break; | |
384 | default: | |
385 | frr_help_exit(1); | |
386 | break; | |
387 | } | |
718e3744 | 388 | } |
d62a17ae | 389 | if (skip_runas) |
390 | memset(&bgpd_privs, 0, sizeof(bgpd_privs)); | |
718e3744 | 391 | |
d62a17ae | 392 | /* BGP master init. */ |
393 | bgp_master_init(frr_init()); | |
394 | bm->port = bgp_port; | |
395 | bm->address = bgp_address; | |
396 | if (no_fib_flag) | |
397 | bgp_option_set(BGP_OPT_NO_FIB); | |
87d4a781 | 398 | |
d62a17ae | 399 | /* Initializations. */ |
400 | bgp_vrf_init(); | |
718e3744 | 401 | |
d62a17ae | 402 | /* BGP related initialization. */ |
403 | bgp_init(); | |
718e3744 | 404 | |
d62a17ae | 405 | snprintf(bgpd_di.startinfo, sizeof(bgpd_di.startinfo), ", bgp@%s:%d", |
406 | (bm->address ? bm->address : "<all>"), bm->port); | |
718e3744 | 407 | |
d62a17ae | 408 | frr_config_fork(); |
409 | frr_run(bm->master); | |
718e3744 | 410 | |
d62a17ae | 411 | /* Not reached. */ |
412 | return (0); | |
718e3744 | 413 | } |