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