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 "logicalrouter.h"
  38 #include "libfrr.h"
  39 #include "routemap.h"
  40 #include "frr_pthread.h"
  41
  42 #include "zebra/zebra_router.h"
  43 #include "zebra/zebra_errors.h"
  44 #include "zebra/rib.h"
  45 #include "zebra/zserv.h"
  46 #include "zebra/debug.h"
  47 #include "zebra/router-id.h"
  48 #include "zebra/irdp.h"
  49 #include "zebra/rtadv.h"
  50 #include "zebra/zebra_ptm.h"
  51 #include "zebra/zebra_ns.h"
  52 #include "zebra/redistribute.h"
  53 #include "zebra/zebra_mpls.h"
  54 #include "zebra/label_manager.h"
  55 #include "zebra/zebra_netns_notify.h"
  56 #include "zebra/zebra_rnh.h"
  57 #include "zebra/zebra_pbr.h"
  58
  59 #if defined(HANDLE_NETLINK_FUZZING)
  60 #include "zebra/kernel_netlink.h"
  61 #endif /* HANDLE_NETLINK_FUZZING */
  62
  63 #define ZEBRA_PTM_SUPPORT
  64
  65 /* Zebra instance */
  66 struct zebra_t zebrad = {
  67         .rtm_table_default = 0,
  68         .packets_to_process = ZEBRA_ZAPI_PACKETS_TO_PROCESS,
  69 };
  70
  71 /* process id. */
  72 pid_t pid;
  73
  74 /* Pacify zclient.o in libfrr, which expects this variable. */
  75 struct thread_master *master;
  76
  77 /* Route retain mode flag. */
  78 int retain_mode = 0;
  79
  80 /* Allow non-quagga entities to delete quagga routes */
  81 int allow_delete = 0;
  82
  83 /* Don't delete kernel route. */
  84 int keep_kernel_mode = 0;
  85
  86 bool v6_rr_semantics = false;
  87
  88 #ifdef HAVE_NETLINK
  89 /* Receive buffer size for netlink socket */
  90 uint32_t nl_rcvbufsize = 4194304;
  91 #endif /* HAVE_NETLINK */
  92
  93 #define OPTION_V6_RR_SEMANTICS 2000
  94 /* Command line options. */
  95 struct option longopts[] = {
  96         {"batch", no_argument, NULL, 'b'},
  97         {"allow_delete", no_argument, NULL, 'a'},
  98         {"keep_kernel", no_argument, NULL, 'k'},
  99         {"socket", required_argument, NULL, 'z'},
 100         {"ecmp", required_argument, NULL, 'e'},
 101         {"label_socket", no_argument, NULL, 'l'},
 102         {"retain", no_argument, NULL, 'r'},
 103         {"vrfdefaultname", required_argument, NULL, 'o'},
 104 #ifdef HAVE_NETLINK
 105         {"vrfwnetns", no_argument, NULL, 'n'},
 106         {"nl-bufsize", required_argument, NULL, 's'},
 107         {"v6-rr-semantics", no_argument, NULL, OPTION_V6_RR_SEMANTICS},
 108 #endif /* HAVE_NETLINK */
 109         {0}};
 110
 111 zebra_capabilities_t _caps_p[] = {
 112         ZCAP_NET_ADMIN, ZCAP_SYS_ADMIN, ZCAP_NET_RAW,
 113 };
 114
 115 /* zebra privileges to run with */
 116 struct zebra_privs_t zserv_privs = {
 117 #if defined(FRR_USER) && defined(FRR_GROUP)
 118         .user = FRR_USER,
 119         .group = FRR_GROUP,
 120 #endif
 121 #ifdef VTY_GROUP
 122         .vty_group = VTY_GROUP,
 123 #endif
 124         .caps_p = _caps_p,
 125         .cap_num_p = array_size(_caps_p),
 126         .cap_num_i = 0};
 127
 128 unsigned int multipath_num = MULTIPATH_NUM;
 129
 130 /* SIGHUP handler. */
 131 static void sighup(void)
 132 {
 133         zlog_info("SIGHUP received");
 134
 135         /* Reload of config file. */
 136         ;
 137 }
 138
 139 /* SIGINT handler. */
 140 static void sigint(void)
 141 {
 142         struct vrf *vrf;
 143         struct zebra_vrf *zvrf;
 144         struct listnode *ln, *nn;
 145         struct zserv *client;
 146         static bool sigint_done;
 147
 148         if (sigint_done)
 149                 return;
 150
 151         sigint_done = true;
 152
 153         zlog_notice("Terminating on signal");
 154
 155         frr_early_fini();
 156
 157         zebra_dplane_pre_finish();
 158
 159         for (ALL_LIST_ELEMENTS(zebrad.client_list, ln, nn, client))
 160                 zserv_close_client(client);
 161
 162         list_delete_all_node(zebrad.client_list);
 163         zebra_ptm_finish();
 164
 165         if (retain_mode)
 166                 RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name) {
 167                         zvrf = vrf->info;
 168                         if (zvrf)
 169                                 SET_FLAG(zvrf->flags, ZEBRA_VRF_RETAIN);
 170                 }
 171         if (zebrad.lsp_process_q)
 172                 work_queue_free_and_null(&zebrad.lsp_process_q);
 173         vrf_terminate();
 174
 175         ns_walk_func(zebra_ns_disabled);
 176         zebra_ns_notify_close();
 177
 178         access_list_reset();
 179         prefix_list_reset();
 180         route_map_finish();
 181
 182         list_delete(&zebrad.client_list);
 183
 184         /* Indicate that all new dplane work has been enqueued. When that
 185          * work is complete, the dataplane will enqueue an event
 186          * with the 'finalize' function.
 187          */
 188         zebra_dplane_finish();
 189 }
 190
 191 /*
 192  * Final shutdown step for the zebra main thread. This is run after all
 193  * async update processing has completed.
 194  */
 195 int zebra_finalize(struct thread *dummy)
 196 {
 197         zlog_info("Zebra final shutdown");
 198
 199         /* Stop dplane thread and finish any cleanup */
 200         zebra_dplane_shutdown();
 201
 202         work_queue_free_and_null(&zebrad.ribq);
 203         meta_queue_free(zebrad.mq);
 204
 205         zebra_router_terminate();
 206
 207         frr_fini();
 208         exit(0);
 209 }
 210
 211 /* SIGUSR1 handler. */
 212 static void sigusr1(void)
 213 {
 214         zlog_rotate();
 215 }
 216
 217 struct quagga_signal_t zebra_signals[] = {
 218         {
 219                 .signal = SIGHUP,
 220                 .handler = &sighup,
 221         },
 222         {
 223                 .signal = SIGUSR1,
 224                 .handler = &sigusr1,
 225         },
 226         {
 227                 .signal = SIGINT,
 228                 .handler = &sigint,
 229         },
 230         {
 231                 .signal = SIGTERM,
 232                 .handler = &sigint,
 233         },
 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 /* Main startup routine. */
 248 int main(int argc, char **argv)
 249 {
 250         // int batch_mode = 0;
 251         char *zserv_path = NULL;
 252         /* Socket to external label manager */
 253         char *lblmgr_path = NULL;
 254         struct sockaddr_storage dummy;
 255         socklen_t dummylen;
 256 #if defined(HANDLE_ZAPI_FUZZING)
 257         char *zapi_fuzzing = NULL;
 258 #endif /* HANDLE_ZAPI_FUZZING */
 259 #if defined(HANDLE_NETLINK_FUZZING)
 260         char *netlink_fuzzing = NULL;
 261 #endif /* HANDLE_NETLINK_FUZZING */
 262
 263         vrf_configure_backend(VRF_BACKEND_VRF_LITE);
 264         logicalrouter_configure_backend(LOGICALROUTER_BACKEND_NETNS);
 265
 266         frr_preinit(&zebra_di, argc, argv);
 267
 268         frr_opt_add(
 269                 "bakz:e:l:o:r"
 270 #ifdef HAVE_NETLINK
 271                 "s:n"
 272 #endif
 273 #if defined(HANDLE_ZAPI_FUZZING)
 274                 "c:"
 275 #endif /* HANDLE_ZAPI_FUZZING */
 276 #if defined(HANDLE_NETLINK_FUZZING)
 277                 "w:"
 278 #endif /* HANDLE_NETLINK_FUZZING */
 279                 ,
 280                 longopts,
 281                 "  -b, --batch           Runs in batch mode\n"
 282                 "  -a, --allow_delete    Allow other processes to delete zebra routes\n"
 283                 "  -z, --socket          Set path of zebra socket\n"
 284                 "  -e, --ecmp            Specify ECMP to use.\n"
 285                 "  -l, --label_socket    Socket to external label manager\n"
 286                 "  -k, --keep_kernel     Don't delete old routes which were installed by zebra.\n"
 287                 "  -r, --retain          When program terminates, retain added route by zebra.\n"
 288                 "  -o, --vrfdefaultname  Set default VRF name.\n"
 289 #ifdef HAVE_NETLINK
 290                 "  -n, --vrfwnetns       Use NetNS as VRF backend\n"
 291                 "  -s, --nl-bufsize      Set netlink receive buffer size\n"
 292                 "      --v6-rr-semantics Use v6 RR semantics\n"
 293 #endif /* HAVE_NETLINK */
 294 #if defined(HANDLE_ZAPI_FUZZING)
 295                 "  -c <file>             Bypass normal startup and use this file for testing of zapi\n"
 296 #endif /* HANDLE_ZAPI_FUZZING */
 297 #if defined(HANDLE_NETLINK_FUZZING)
 298                 "  -w <file>             Bypass normal startup and use this file for testing of netlink input\n"
 299 #endif /* HANDLE_NETLINK_FUZZING */
 300         );
 301
 302         while (1) {
 303                 int opt = frr_getopt(argc, argv, NULL);
 304
 305                 if (opt == EOF)
 306                         break;
 307
 308                 switch (opt) {
 309                 case 0:
 310                         break;
 311                 case 'b':
 312                         // batch_mode = 1;
 313                         break;
 314                 case 'a':
 315                         allow_delete = 1;
 316                         break;
 317                 case 'k':
 318                         keep_kernel_mode = 1;
 319                         break;
 320                 case 'e':
 321                         multipath_num = atoi(optarg);
 322                         if (multipath_num > MULTIPATH_NUM
 323                             || multipath_num <= 0) {
 324                                 flog_err(
 325                                         EC_ZEBRA_BAD_MULTIPATH_NUM,
 326                                         "Multipath Number specified must be less than %d and greater than 0",
 327                                         MULTIPATH_NUM);
 328                                 return 1;
 329                         }
 330                         break;
 331                 case 'o':
 332                         vrf_set_default_name(optarg);
 333                         break;
 334                 case 'z':
 335                         zserv_path = optarg;
 336                         if (!frr_zclient_addr(&dummy, &dummylen, optarg)) {
 337                                 fprintf(stderr,
 338                                         "Invalid zserv socket path: %s\n",
 339                                         optarg);
 340                                 exit(1);
 341                         }
 342                         break;
 343                 case 'l':
 344                         lblmgr_path = optarg;
 345                         break;
 346                 case 'r':
 347                         retain_mode = 1;
 348                         break;
 349 #ifdef HAVE_NETLINK
 350                 case 's':
 351                         nl_rcvbufsize = atoi(optarg);
 352                         break;
 353                 case 'n':
 354                         vrf_configure_backend(VRF_BACKEND_NETNS);
 355                         logicalrouter_configure_backend(
 356                                 LOGICALROUTER_BACKEND_OFF);
 357                         break;
 358                 case OPTION_V6_RR_SEMANTICS:
 359                         v6_rr_semantics = true;
 360                         break;
 361 #endif /* HAVE_NETLINK */
 362 #if defined(HANDLE_ZAPI_FUZZING)
 363                 case 'c':
 364                         zapi_fuzzing = optarg;
 365                         break;
 366 #endif /* HANDLE_ZAPI_FUZZING */
 367 #if defined(HANDLE_NETLINK_FUZZING)
 368                 case 'w':
 369                         netlink_fuzzing = optarg;
 370                         /* This ensures we are aren't writing any of the
 371                          * startup netlink messages that happen when we
 372                          * just want to read.
 373                          */
 374                         netlink_read = true;
 375                         break;
 376 #endif /* HANDLE_NETLINK_FUZZING */
 377                 default:
 378                         frr_help_exit(1);
 379                         break;
 380                 }
 381         }
 382
 383         vty_config_lockless();
 384         zebrad.master = frr_init();
 385
 386         /* Zebra related initialize. */
 387         zebra_router_init();
 388         zserv_init();
 389         rib_init();
 390         zebra_if_init();
 391         zebra_debug_init();
 392         router_id_cmd_init();
 393
 394         /*
 395          * Initialize NS( and implicitly the VRF module), and make kernel
 396          * routing socket. */
 397         zebra_ns_init();
 398
 399         zebra_vty_init();
 400         access_list_init();
 401         prefix_list_init();
 402 #if defined(HAVE_RTADV)
 403         rtadv_cmd_init();
 404 #endif
 405 /* PTM socket */
 406 #ifdef ZEBRA_PTM_SUPPORT
 407         zebra_ptm_init();
 408 #endif
 409
 410         zebra_mpls_init();
 411         zebra_mpls_vty_init();
 412         zebra_pw_vty_init();
 413         zebra_pbr_init();
 414
 415 /* For debug purpose. */
 416 /* SET_FLAG (zebra_debug_event, ZEBRA_DEBUG_EVENT); */
 417
 418         /* Process the configuration file. Among other configuration
 419         *  directives we can meet those installing static routes. Such
 420         *  requests will not be executed immediately, but queued in
 421         *  zebra->ribq structure until we enter the main execution loop.
 422         *  The notifications from kernel will show originating PID equal
 423         *  to that after daemon() completes (if ever called).
 424         */
 425         frr_config_fork();
 426
 427         /* After we have successfully acquired the pidfile, we can be sure
 428         *  about being the only copy of zebra process, which is submitting
 429         *  changes to the FIB.
 430         *  Clean up zebra-originated routes. The requests will be sent to OS
 431         *  immediately, so originating PID in notifications from kernel
 432         *  will be equal to the current getpid(). To know about such routes,
 433         * we have to have route_read() called before.
 434         */
 435         if (!keep_kernel_mode)
 436                 rib_sweep_route();
 437
 438         /* Needed for BSD routing socket. */
 439         pid = getpid();
 440
 441         /* Intialize pthread library */
 442         frr_pthread_init();
 443
 444         /* Start Zebra API server */
 445         zserv_start(zserv_path);
 446
 447         /* Init label manager */
 448         label_manager_init(lblmgr_path);
 449
 450         /* RNH init */
 451         zebra_rnh_init();
 452
 453         /* Error init */
 454         zebra_error_init();
 455
 456 #if defined(HANDLE_ZAPI_FUZZING)
 457         if (zapi_fuzzing) {
 458                 zserv_read_file(zapi_fuzzing);
 459                 exit(0);
 460         }
 461 #endif /* HANDLE_ZAPI_FUZZING */
 462 #if defined(HANDLE_NETLINK_FUZZING)
 463         if (netlink_fuzzing) {
 464                 netlink_read_init(netlink_fuzzing);
 465                 exit(0);
 466         }
 467 #endif /* HANDLE_NETLINK_FUZZING */
 468
 469
 470         frr_run(zebrad.master);
 471
 472         /* Not reached... */
 473         return 0;
 474 }