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
  40 #include "zebra/rib.h"
  41 #include "zebra/zserv.h"
  42 #include "zebra/debug.h"
  43 #include "zebra/router-id.h"
  44 #include "zebra/irdp.h"
  45 #include "zebra/rtadv.h"
  46 #include "zebra/zebra_ptm.h"
  47 #include "zebra/zebra_ns.h"
  48 #include "zebra/redistribute.h"
  49 #include "zebra/zebra_mpls.h"
  50 #include "zebra/label_manager.h"
  51 #include "zebra/zebra_netns_notify.h"
  52
  53 #define ZEBRA_PTM_SUPPORT
  54
  55 /* Zebra instance */
  56 struct zebra_t zebrad = {
  57         .rtm_table_default = 0,
  58         .packets_to_process = ZEBRA_ZAPI_PACKETS_TO_PROCESS,
  59 };
  60
  61 /* process id. */
  62 pid_t pid;
  63
  64 /* Pacify zclient.o in libfrr, which expects this variable. */
  65 struct thread_master *master;
  66
  67 /* Route retain mode flag. */
  68 int retain_mode = 0;
  69
  70 /* Allow non-quagga entities to delete quagga routes */
  71 int allow_delete = 0;
  72
  73 /* Don't delete kernel route. */
  74 int keep_kernel_mode = 0;
  75
  76 #ifdef HAVE_NETLINK
  77 /* Receive buffer size for netlink socket */
  78 u_int32_t nl_rcvbufsize = 4194304;
  79 #endif /* HAVE_NETLINK */
  80
  81 /* Command line options. */
  82 struct option longopts[] = {{"batch", no_argument, NULL, 'b'},
  83                             {"allow_delete", no_argument, NULL, 'a'},
  84                             {"keep_kernel", no_argument, NULL, 'k'},
  85                             {"socket", required_argument, NULL, 'z'},
  86                             {"ecmp", required_argument, NULL, 'e'},
  87                             {"label_socket", no_argument, NULL, 'l'},
  88                             {"retain", no_argument, NULL, 'r'},
  89 #ifdef HAVE_NETLINK
  90                             {"vrfwnetns", no_argument, NULL, 'n'},
  91                             {"nl-bufsize", required_argument, NULL, 's'},
  92 #endif /* HAVE_NETLINK */
  93                             {0}};
  94
  95 zebra_capabilities_t _caps_p[] = {
  96         ZCAP_NET_ADMIN, ZCAP_SYS_ADMIN, ZCAP_NET_RAW,
  97 };
  98
  99 /* zebra privileges to run with */
 100 struct zebra_privs_t zserv_privs = {
 101 #if defined(FRR_USER) && defined(FRR_GROUP)
 102         .user = FRR_USER,
 103         .group = FRR_GROUP,
 104 #endif
 105 #ifdef VTY_GROUP
 106         .vty_group = VTY_GROUP,
 107 #endif
 108         .caps_p = _caps_p,
 109         .cap_num_p = array_size(_caps_p),
 110         .cap_num_i = 0};
 111
 112 unsigned int multipath_num = MULTIPATH_NUM;
 113
 114 /* SIGHUP handler. */
 115 static void sighup(void)
 116 {
 117         zlog_info("SIGHUP received");
 118
 119         /* Reload of config file. */
 120         ;
 121 }
 122
 123 /* SIGINT handler. */
 124 static void sigint(void)
 125 {
 126         struct vrf *vrf;
 127         struct zebra_vrf *zvrf;
 128
 129         zlog_notice("Terminating on signal");
 130
 131         frr_early_fini();
 132
 133         list_delete_all_node(zebrad.client_list);
 134         zebra_ptm_finish();
 135
 136         if (retain_mode)
 137                 RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name) {
 138                         zvrf = vrf->info;
 139                         if (zvrf)
 140                                 SET_FLAG(zvrf->flags, ZEBRA_VRF_RETAIN);
 141                 }
 142         if (zebrad.lsp_process_q)
 143                 work_queue_free_and_null(&zebrad.lsp_process_q);
 144         vrf_terminate();
 145
 146         ns_walk_func(zebra_ns_disabled);
 147         zebra_ns_notify_close();
 148
 149         access_list_reset();
 150         prefix_list_reset();
 151         route_map_finish();
 152
 153         list_delete_and_null(&zebrad.client_list);
 154         work_queue_free_and_null(&zebrad.ribq);
 155         meta_queue_free(zebrad.mq);
 156
 157         frr_fini();
 158         exit(0);
 159 }
 160
 161 /* SIGUSR1 handler. */
 162 static void sigusr1(void)
 163 {
 164         zlog_rotate();
 165 }
 166
 167 struct quagga_signal_t zebra_signals[] = {
 168         {
 169                 .signal = SIGHUP,
 170                 .handler = &sighup,
 171         },
 172         {
 173                 .signal = SIGUSR1,
 174                 .handler = &sigusr1,
 175         },
 176         {
 177                 .signal = SIGINT,
 178                 .handler = &sigint,
 179         },
 180         {
 181                 .signal = SIGTERM,
 182                 .handler = &sigint,
 183         },
 184 };
 185
 186 FRR_DAEMON_INFO(
 187         zebra, ZEBRA, .vty_port = ZEBRA_VTY_PORT, .flags = FRR_NO_ZCLIENT,
 188
 189         .proghelp =
 190                 "Daemon which manages kernel routing table management "
 191                 "and\nredistribution between different routing protocols.",
 192
 193         .signals = zebra_signals, .n_signals = array_size(zebra_signals),
 194
 195         .privs = &zserv_privs, )
 196
 197 /* Main startup routine. */
 198 int main(int argc, char **argv)
 199 {
 200         // int batch_mode = 0;
 201         char *zserv_path = NULL;
 202         /* Socket to external label manager */
 203         char *lblmgr_path = NULL;
 204         struct sockaddr_storage dummy;
 205         socklen_t dummylen;
 206 #if defined(HANDLE_ZAPI_FUZZING)
 207         char *fuzzing = NULL;
 208 #endif
 209
 210         vrf_configure_backend(VRF_BACKEND_VRF_LITE);
 211         logicalrouter_configure_backend(LOGICALROUTER_BACKEND_NETNS);
 212
 213         frr_preinit(&zebra_di, argc, argv);
 214
 215         frr_opt_add(
 216                 "bakz:e:l:r"
 217 #ifdef HAVE_NETLINK
 218                 "s:n"
 219 #endif
 220 #if defined(HANDLE_ZAPI_FUZZING)
 221                 "c:"
 222 #endif
 223                 ,
 224                 longopts,
 225                 "  -b, --batch        Runs in batch mode\n"
 226                 "  -a, --allow_delete Allow other processes to delete zebra routes\n"
 227                 "  -z, --socket       Set path of zebra socket\n"
 228                 "  -e, --ecmp         Specify ECMP to use.\n"
 229                 "  -l, --label_socket Socket to external label manager\n"
 230                 "  -k, --keep_kernel  Don't delete old routes which installed by zebra.\n"
 231                 "  -r, --retain       When program terminates, retain added route by zebra.\n"
 232 #ifdef HAVE_NETLINK
 233                 "  -n, --vrfwnetns    Set VRF with NetNS\n"
 234                 "  -s, --nl-bufsize   Set netlink receive buffer size\n"
 235 #endif /* HAVE_NETLINK */
 236 #if defined(HANDLE_ZAPI_FUZZING)
 237                 "  -c <file>          Bypass normal startup use this file for tetsting of zapi"
 238 #endif
 239                 );
 240
 241         while (1) {
 242                 int opt = frr_getopt(argc, argv, NULL);
 243
 244                 if (opt == EOF)
 245                         break;
 246
 247                 switch (opt) {
 248                 case 0:
 249                         break;
 250                 case 'b':
 251                         // batch_mode = 1;
 252                         break;
 253                 case 'a':
 254                         allow_delete = 1;
 255                         break;
 256                 case 'k':
 257                         keep_kernel_mode = 1;
 258                         break;
 259                 case 'e':
 260                         multipath_num = atoi(optarg);
 261                         if (multipath_num > MULTIPATH_NUM
 262                             || multipath_num <= 0) {
 263                                 zlog_err(
 264                                         "Multipath Number specified must be less than %d and greater than 0",
 265                                         MULTIPATH_NUM);
 266                                 return 1;
 267                         }
 268                         break;
 269                 case 'z':
 270                         zserv_path = optarg;
 271                         if (!frr_zclient_addr(&dummy, &dummylen, optarg)) {
 272                                 fprintf(stderr,
 273                                         "Invalid zserv socket path: %s\n",
 274                                         optarg);
 275                                 exit(1);
 276                         }
 277                         break;
 278                 case 'l':
 279                         lblmgr_path = optarg;
 280                         break;
 281                 case 'r':
 282                         retain_mode = 1;
 283                         break;
 284 #ifdef HAVE_NETLINK
 285                 case 's':
 286                         nl_rcvbufsize = atoi(optarg);
 287                         break;
 288                 case 'n':
 289                         vrf_configure_backend(VRF_BACKEND_NETNS);
 290                         logicalrouter_configure_backend(
 291                                 LOGICALROUTER_BACKEND_OFF);
 292                         break;
 293 #endif /* HAVE_NETLINK */
 294 #if defined(HANDLE_ZAPI_FUZZING)
 295                 case 'c':
 296                         fuzzing = optarg;
 297                         break;
 298 #endif
 299                 default:
 300                         frr_help_exit(1);
 301                         break;
 302                 }
 303         }
 304
 305         vty_config_lockless();
 306         zebrad.master = frr_init();
 307
 308         /* Zebra related initialize. */
 309         zserv_init();
 310         rib_init();
 311         zebra_if_init();
 312         zebra_debug_init();
 313         router_id_cmd_init();
 314
 315         /*
 316          * Initialize NS( and implicitly the VRF module), and make kernel
 317          * routing socket. */
 318         zebra_ns_init();
 319
 320         zebra_vty_init();
 321         access_list_init();
 322         prefix_list_init();
 323 #if defined(HAVE_RTADV)
 324         rtadv_cmd_init();
 325 #endif
 326 /* PTM socket */
 327 #ifdef ZEBRA_PTM_SUPPORT
 328         zebra_ptm_init();
 329 #endif
 330
 331         zebra_mpls_init();
 332         zebra_mpls_vty_init();
 333         zebra_pw_vty_init();
 334
 335 /* For debug purpose. */
 336 /* SET_FLAG (zebra_debug_event, ZEBRA_DEBUG_EVENT); */
 337
 338 #if defined(HANDLE_ZAPI_FUZZING)
 339         if (fuzzing) {
 340                 zserv_read_file(fuzzing);
 341                 exit(0);
 342         }
 343 #endif
 344
 345         /* Process the configuration file. Among other configuration
 346         *  directives we can meet those installing static routes. Such
 347         *  requests will not be executed immediately, but queued in
 348         *  zebra->ribq structure until we enter the main execution loop.
 349         *  The notifications from kernel will show originating PID equal
 350         *  to that after daemon() completes (if ever called).
 351         */
 352         frr_config_fork();
 353
 354         /* After we have successfully acquired the pidfile, we can be sure
 355         *  about being the only copy of zebra process, which is submitting
 356         *  changes to the FIB.
 357         *  Clean up zebra-originated routes. The requests will be sent to OS
 358         *  immediately, so originating PID in notifications from kernel
 359         *  will be equal to the current getpid(). To know about such routes,
 360         * we have to have route_read() called before.
 361         */
 362         if (!keep_kernel_mode)
 363                 rib_sweep_route();
 364
 365         /* Needed for BSD routing socket. */
 366         pid = getpid();
 367
 368         /* This must be done only after locking pidfile (bug #403). */
 369         zebra_zserv_socket_init(zserv_path);
 370
 371         /* Init label manager */
 372         label_manager_init(lblmgr_path);
 373
 374         frr_run(zebrad.master);
 375
 376         /* Not reached... */
 377         return 0;
 378 }