zebra/main.c

   1 /* zebra daemon main routine.
   2  * Copyright (C) 1997, 98 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  */
  20
  21 #include <zebra.h>
  22
  23 #include <lib/version.h>
  24 #include "getopt.h"
  25 #include "command.h"
  26 #include "thread.h"
  27 #include "filter.h"
  28 #include "memory.h"
  29 #include "prefix.h"
  30 #include "log.h"
  31 #include "plist.h"
  32 #include "privs.h"
  33 #include "sigevent.h"
  34 #include "vrf.h"
  35 #include "libfrr.h"
  36 #include "routemap.h"
  37 #include "routing_nb.h"
  38
  39 #include "zebra/zebra_router.h"
  40 #include "zebra/zebra_errors.h"
  41 #include "zebra/rib.h"
  42 #include "zebra/zserv.h"
  43 #include "zebra/debug.h"
  44 #include "zebra/router-id.h"
  45 #include "zebra/irdp.h"
  46 #include "zebra/rtadv.h"
  47 #include "zebra/zebra_ptm.h"
  48 #include "zebra/zebra_ns.h"
  49 #include "zebra/redistribute.h"
  50 #include "zebra/zebra_mpls.h"
  51 #include "zebra/label_manager.h"
  52 #include "zebra/zebra_netns_notify.h"
  53 #include "zebra/zebra_rnh.h"
  54 #include "zebra/zebra_pbr.h"
  55 #include "zebra/zebra_vxlan.h"
  56 #include "zebra/zebra_routemap.h"
  57 #include "zebra/zebra_nb.h"
  58 #include "zebra/zebra_opaque.h"
  59 #include "zebra/zebra_srte.h"
  60 #include "zebra/zebra_srv6.h"
  61 #include "zebra/zebra_srv6_vty.h"
  62
  63 #define ZEBRA_PTM_SUPPORT
  64
  65 /* process id. */
  66 pid_t pid;
  67
  68 /* Pacify zclient.o in libfrr, which expects this variable. */
  69 struct thread_master *master;
  70
  71 /* Route retain mode flag. */
  72 int retain_mode = 0;
  73
  74 /* Allow non-frr entities to delete frr routes */
  75 int allow_delete = 0;
  76
  77 int graceful_restart;
  78
  79 bool v6_rr_semantics = false;
  80
  81 /* Receive buffer size for kernel control sockets */
  82 #define RCVBUFSIZE_MIN 4194304
  83 #ifdef HAVE_NETLINK
  84 uint32_t rcvbufsize = RCVBUFSIZE_MIN;
  85 #else
  86 uint32_t rcvbufsize = 128 * 1024;
  87 #endif
  88
  89 #define OPTION_V6_RR_SEMANTICS 2000
  90 #define OPTION_ASIC_OFFLOAD    2001
  91
  92 /* Command line options. */
  93 const struct option longopts[] = {
  94         {"batch", no_argument, NULL, 'b'},
  95         {"allow_delete", no_argument, NULL, 'a'},
  96         {"socket", required_argument, NULL, 'z'},
  97         {"ecmp", required_argument, NULL, 'e'},
  98         {"retain", no_argument, NULL, 'r'},
  99         {"graceful_restart", required_argument, NULL, 'K'},
 100         {"asic-offload", optional_argument, NULL, OPTION_ASIC_OFFLOAD},
 101 #ifdef HAVE_NETLINK
 102         {"vrfwnetns", no_argument, NULL, 'n'},
 103         {"nl-bufsize", required_argument, NULL, 's'},
 104         {"v6-rr-semantics", no_argument, NULL, OPTION_V6_RR_SEMANTICS},
 105 #endif /* HAVE_NETLINK */
 106         {0}};
 107
 108 zebra_capabilities_t _caps_p[] = {
 109         ZCAP_NET_ADMIN, ZCAP_SYS_ADMIN, ZCAP_NET_RAW,
 110 };
 111
 112 /* zebra privileges to run with */
 113 struct zebra_privs_t zserv_privs = {
 114 #if defined(FRR_USER) && defined(FRR_GROUP)
 115         .user = FRR_USER,
 116         .group = FRR_GROUP,
 117 #endif
 118 #ifdef VTY_GROUP
 119         .vty_group = VTY_GROUP,
 120 #endif
 121         .caps_p = _caps_p,
 122         .cap_num_p = array_size(_caps_p),
 123         .cap_num_i = 0};
 124
 125 /* SIGHUP handler. */
 126 static void sighup(void)
 127 {
 128         zlog_info("SIGHUP received");
 129
 130         /* Reload of config file. */
 131         ;
 132 }
 133
 134 /* SIGINT handler. */
 135 static void sigint(void)
 136 {
 137         struct vrf *vrf;
 138         struct zebra_vrf *zvrf;
 139         struct listnode *ln, *nn;
 140         struct zserv *client;
 141         static bool sigint_done;
 142
 143         if (sigint_done)
 144                 return;
 145
 146         sigint_done = true;
 147
 148         zlog_notice("Terminating on signal");
 149
 150         atomic_store_explicit(&zrouter.in_shutdown, true,
 151                               memory_order_relaxed);
 152
 153         /* send RA lifetime of 0 before stopping. rfc4861/6.2.5 */
 154         rtadv_stop_ra_all();
 155
 156         frr_early_fini();
 157
 158         /* Stop the opaque module pthread */
 159         zebra_opaque_stop();
 160
 161         zebra_dplane_pre_finish();
 162
 163         /* Clean up GR related info. */
 164         zebra_gr_stale_client_cleanup(zrouter.stale_client_list);
 165         list_delete_all_node(zrouter.stale_client_list);
 166
 167         /* Clean up zapi clients and server module */
 168         for (ALL_LIST_ELEMENTS(zrouter.client_list, ln, nn, client))
 169                 zserv_close_client(client);
 170
 171         zserv_close();
 172         list_delete_all_node(zrouter.client_list);
 173
 174         /* Once all the zclients are cleaned up, clean up the opaque module */
 175         zebra_opaque_finish();
 176
 177         zebra_ptm_finish();
 178
 179         if (retain_mode) {
 180                 zebra_nhg_mark_keep();
 181                 RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name) {
 182                         zvrf = vrf->info;
 183                         if (zvrf)
 184                                 SET_FLAG(zvrf->flags, ZEBRA_VRF_RETAIN);
 185                 }
 186         }
 187
 188         if (zrouter.lsp_process_q)
 189                 work_queue_free_and_null(&zrouter.lsp_process_q);
 190
 191         vrf_terminate();
 192
 193         ns_walk_func(zebra_ns_early_shutdown, NULL, NULL);
 194         zebra_ns_notify_close();
 195
 196         access_list_reset();
 197         prefix_list_reset();
 198         /*
 199          * zebra_routemap_finish will
 200          * 1 set rmap upd timer to 0 so that rmap update wont be scheduled again
 201          * 2 Put off the rmap update thread
 202          * 3 route_map_finish
 203          */
 204         zebra_routemap_finish();
 205
 206         list_delete(&zrouter.client_list);
 207
 208         /* Indicate that all new dplane work has been enqueued. When that
 209          * work is complete, the dataplane will enqueue an event
 210          * with the 'finalize' function.
 211          */
 212         zebra_dplane_finish();
 213 }
 214
 215 /*
 216  * Final shutdown step for the zebra main thread. This is run after all
 217  * async update processing has completed.
 218  */
 219 void zebra_finalize(struct thread *dummy)
 220 {
 221         zlog_info("Zebra final shutdown");
 222
 223         /* Final shutdown of ns resources */
 224         ns_walk_func(zebra_ns_final_shutdown, NULL, NULL);
 225
 226         /* Stop dplane thread and finish any cleanup */
 227         zebra_dplane_shutdown();
 228
 229         zebra_router_terminate();
 230
 231         frr_fini();
 232         exit(0);
 233 }
 234
 235 /* SIGUSR1 handler. */
 236 static void sigusr1(void)
 237 {
 238         zlog_rotate();
 239 }
 240
 241 struct frr_signal_t zebra_signals[] = {
 242         {
 243                 .signal = SIGHUP,
 244                 .handler = &sighup,
 245         },
 246         {
 247                 .signal = SIGUSR1,
 248                 .handler = &sigusr1,
 249         },
 250         {
 251                 .signal = SIGINT,
 252                 .handler = &sigint,
 253         },
 254         {
 255                 .signal = SIGTERM,
 256                 .handler = &sigint,
 257         },
 258 };
 259
 260 static const struct frr_yang_module_info *const zebra_yang_modules[] = {
 261         &frr_filter_info,
 262         &frr_interface_info,
 263         &frr_route_map_info,
 264         &frr_zebra_info,
 265         &frr_vrf_info,
 266         &frr_routing_info,
 267         &frr_zebra_route_map_info,
 268 };
 269
 270 FRR_DAEMON_INFO(
 271         zebra, ZEBRA, .vty_port = ZEBRA_VTY_PORT, .flags = FRR_NO_ZCLIENT,
 272
 273         .proghelp =
 274                 "Daemon which manages kernel routing table management and\nredistribution between different routing protocols.",
 275
 276         .signals = zebra_signals, .n_signals = array_size(zebra_signals),
 277
 278         .privs = &zserv_privs,
 279
 280         .yang_modules = zebra_yang_modules,
 281         .n_yang_modules = array_size(zebra_yang_modules),
 282 );
 283
 284 /* Main startup routine. */
 285 int main(int argc, char **argv)
 286 {
 287         // int batch_mode = 0;
 288         char *zserv_path = NULL;
 289         struct sockaddr_storage dummy;
 290         socklen_t dummylen;
 291         bool asic_offload = false;
 292         bool notify_on_ack = true;
 293
 294         graceful_restart = 0;
 295         vrf_configure_backend(VRF_BACKEND_VRF_LITE);
 296
 297         frr_preinit(&zebra_di, argc, argv);
 298
 299         frr_opt_add(
 300                 "baz:e:rK:s:"
 301 #ifdef HAVE_NETLINK
 302                 "n"
 303 #endif
 304                 ,
 305                 longopts,
 306                 "  -b, --batch              Runs in batch mode\n"
 307                 "  -a, --allow_delete       Allow other processes to delete zebra routes\n"
 308                 "  -z, --socket             Set path of zebra socket\n"
 309                 "  -e, --ecmp               Specify ECMP to use.\n"
 310                 "  -r, --retain             When program terminates, retain added route by zebra.\n"
 311                 "  -K, --graceful_restart   Graceful restart at the kernel level, timer in seconds for expiration\n"
 312                 "  -A, --asic-offload       FRR is interacting with an asic underneath the linux kernel\n"
 313 #ifdef HAVE_NETLINK
 314                 "  -s, --nl-bufsize         Set netlink receive buffer size\n"
 315                 "  -n, --vrfwnetns          Use NetNS as VRF backend\n"
 316                 "      --v6-rr-semantics    Use v6 RR semantics\n"
 317 #else
 318                 "  -s,                      Set kernel socket receive buffer size\n"
 319 #endif /* HAVE_NETLINK */
 320         );
 321
 322         while (1) {
 323                 int opt = frr_getopt(argc, argv, NULL);
 324
 325                 if (opt == EOF)
 326                         break;
 327
 328                 switch (opt) {
 329                 case 0:
 330                         break;
 331                 case 'b':
 332                         // batch_mode = 1;
 333                         break;
 334                 case 'a':
 335                         allow_delete = 1;
 336                         break;
 337                 case 'e': {
 338                         unsigned long int parsed_multipath =
 339                                 strtoul(optarg, NULL, 10);
 340                         if (parsed_multipath == 0
 341                             || parsed_multipath > MULTIPATH_NUM
 342                             || parsed_multipath > UINT32_MAX) {
 343                                 flog_err(
 344                                         EC_ZEBRA_BAD_MULTIPATH_NUM,
 345                                         "Multipath Number specified must be less than %u and greater than 0",
 346                                         MULTIPATH_NUM);
 347                                 return 1;
 348                         }
 349                         zrouter.multipath_num = parsed_multipath;
 350                         break;
 351                 }
 352                 case 'z':
 353                         zserv_path = optarg;
 354                         if (!frr_zclient_addr(&dummy, &dummylen, optarg)) {
 355                                 fprintf(stderr,
 356                                         "Invalid zserv socket path: %s\n",
 357                                         optarg);
 358                                 exit(1);
 359                         }
 360                         break;
 361                 case 'r':
 362                         retain_mode = 1;
 363                         break;
 364                 case 'K':
 365                         graceful_restart = atoi(optarg);
 366                         break;
 367                 case 's':
 368                         rcvbufsize = atoi(optarg);
 369                         if (rcvbufsize < RCVBUFSIZE_MIN)
 370                                 fprintf(stderr,
 371                                         "Rcvbufsize is smaller than recommended value: %d\n",
 372                                         RCVBUFSIZE_MIN);
 373                         break;
 374 #ifdef HAVE_NETLINK
 375                 case 'n':
 376                         vrf_configure_backend(VRF_BACKEND_NETNS);
 377                         break;
 378                 case OPTION_V6_RR_SEMANTICS:
 379                         v6_rr_semantics = true;
 380                         break;
 381                 case OPTION_ASIC_OFFLOAD:
 382                         if (!strcmp(optarg, "notify_on_offload"))
 383                                 notify_on_ack = false;
 384                         if (!strcmp(optarg, "notify_on_ack"))
 385                                 notify_on_ack = true;
 386                         asic_offload = true;
 387                         break;
 388 #endif /* HAVE_NETLINK */
 389                 default:
 390                         frr_help_exit(1);
 391                 }
 392         }
 393
 394         zrouter.master = frr_init();
 395
 396         /* Zebra related initialize. */
 397         zebra_router_init(asic_offload, notify_on_ack);
 398         zserv_init();
 399         rib_init();
 400         zebra_if_init();
 401         zebra_debug_init();
 402
 403         /*
 404          * Initialize NS( and implicitly the VRF module), and make kernel
 405          * routing socket. */
 406         zebra_ns_init();
 407         router_id_cmd_init();
 408         zebra_vty_init();
 409         access_list_init();
 410         prefix_list_init();
 411 #if defined(HAVE_RTADV)
 412         rtadv_cmd_init();
 413 #endif
 414 /* PTM socket */
 415 #ifdef ZEBRA_PTM_SUPPORT
 416         zebra_ptm_init();
 417 #endif
 418
 419         zebra_mpls_init();
 420         zebra_mpls_vty_init();
 421         zebra_pw_vty_init();
 422         zebra_pbr_init();
 423         zebra_opaque_init();
 424         zebra_srte_init();
 425         zebra_srv6_init();
 426         zebra_srv6_vty_init();
 427
 428         /* For debug purpose. */
 429         /* SET_FLAG (zebra_debug_event, ZEBRA_DEBUG_EVENT); */
 430
 431         /* Process the configuration file. Among other configuration
 432         *  directives we can meet those installing static routes. Such
 433         *  requests will not be executed immediately, but queued in
 434         *  zebra->ribq structure until we enter the main execution loop.
 435         *  The notifications from kernel will show originating PID equal
 436         *  to that after daemon() completes (if ever called).
 437         */
 438         frr_config_fork();
 439
 440         /* After we have successfully acquired the pidfile, we can be sure
 441         *  about being the only copy of zebra process, which is submitting
 442         *  changes to the FIB.
 443         *  Clean up zebra-originated routes. The requests will be sent to OS
 444         *  immediately, so originating PID in notifications from kernel
 445         *  will be equal to the current getpid(). To know about such routes,
 446         * we have to have route_read() called before.
 447         */
 448         zrouter.startup_time = monotime(NULL);
 449         thread_add_timer(zrouter.master, rib_sweep_route, NULL,
 450                          graceful_restart, &zrouter.sweeper);
 451
 452         /* Needed for BSD routing socket. */
 453         pid = getpid();
 454
 455         /* Start dataplane system */
 456         zebra_dplane_start();
 457
 458         /* Start the ted module, before zserv */
 459         zebra_opaque_start();
 460
 461         /* Start Zebra API server */
 462         zserv_start(zserv_path);
 463
 464         /* Init label manager */
 465         label_manager_init();
 466
 467         /* RNH init */
 468         zebra_rnh_init();
 469
 470         /* Config handler Init */
 471         zebra_evpn_init();
 472
 473         /* Error init */
 474         zebra_error_init();
 475
 476         frr_run(zrouter.master);
 477
 478         /* Not reached... */
 479         return 0;
 480 }