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