eigrpd/eigrpd.c

   1 /*
   2  * EIGRP Daemon Program.
   3  * Copyright (C) 2013-2014
   4  * Authors:
   5  *   Donnie Savage
   6  *   Jan Janovic
   7  *   Matej Perina
   8  *   Peter Orsag
   9  *   Peter Paluch
  10  *
  11  * This file is part of GNU Zebra.
  12  *
  13  * GNU Zebra is free software; you can redistribute it and/or modify it
  14  * under the terms of the GNU General Public License as published by the
  15  * Free Software Foundation; either version 2, or (at your option) any
  16  * later version.
  17  *
  18  * GNU Zebra is distributed in the hope that it will be useful, but
  19  * WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21  * General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License along
  24  * with this program; see the file COPYING; if not, write to the Free Software
  25  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  26  */
  27
  28 #include <zebra.h>
  29
  30 #include "thread.h"
  31 #include "vty.h"
  32 #include "command.h"
  33 #include "linklist.h"
  34 #include "prefix.h"
  35 #include "table.h"
  36 #include "if.h"
  37 #include "memory.h"
  38 #include "stream.h"
  39 #include "log.h"
  40 #include "sockunion.h" /* for inet_aton () */
  41 #include "zclient.h"
  42 #include "plist.h"
  43 #include "sockopt.h"
  44 #include "keychain.h"
  45 #include "libfrr.h"
  46 #include "lib_errors.h"
  47
  48 #include "eigrpd/eigrp_structs.h"
  49 #include "eigrpd/eigrpd.h"
  50 #include "eigrpd/eigrp_interface.h"
  51 #include "eigrpd/eigrp_zebra.h"
  52 #include "eigrpd/eigrp_vty.h"
  53 #include "eigrpd/eigrp_neighbor.h"
  54 #include "eigrpd/eigrp_packet.h"
  55 #include "eigrpd/eigrp_network.h"
  56 #include "eigrpd/eigrp_topology.h"
  57 #include "eigrpd/eigrp_memory.h"
  58
  59 DEFINE_QOBJ_TYPE(eigrp)
  60
  61 static struct eigrp_master eigrp_master;
  62
  63 struct eigrp_master *eigrp_om;
  64
  65 static struct eigrp *eigrp_new(const char *);
  66
  67 extern struct zclient *zclient;
  68 extern struct in_addr router_id_zebra;
  69
  70
  71 /*
  72  * void eigrp_router_id_update(struct eigrp *eigrp)
  73  *
  74  * Description:
  75  * update routerid associated with this instance of EIGRP.
  76  * If the id changes, then call if_update for each interface
  77  * to resync the topology database with all neighbors
  78  *
  79  * Select the router ID based on these priorities:
  80  *   1. Statically assigned router ID is always the first choice.
  81  *   2. If there is no statically assigned router ID, then try to stick
  82  *      with the most recent value, since changing router ID's is very
  83  *      disruptive.
  84  *   3. Last choice: just go with whatever the zebra daemon recommends.
  85  *
  86  * Note:
  87  * router id for EIGRP is really just a 32 bit number. Cisco historically
  88  * displays it in dotted decimal notation, and will pickup an IP address
  89  * from an interface so it can be 'auto-configed" to a uniqe value
  90  *
  91  * This does not work for IPv6, and to make the code simpler, its
  92  * stored and processed internerall as a 32bit number
  93  */
  94 void eigrp_router_id_update(struct eigrp *eigrp)
  95 {
  96         struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT);
  97         struct interface *ifp;
  98         uint32_t router_id, router_id_old;
  99
 100         router_id_old = eigrp->router_id;
 101
 102         if (eigrp->router_id_static != 0)
 103                 router_id = eigrp->router_id_static;
 104
 105         else if (eigrp->router_id != 0)
 106                 router_id = eigrp->router_id;
 107
 108         else
 109                 router_id = router_id_zebra.s_addr;
 110
 111         eigrp->router_id = router_id;
 112         if (router_id_old != router_id) {
 113                 //      if (IS_DEBUG_EIGRP_EVENT)
 114                 //        zlog_debug("Router-ID[NEW:%s]: Update",
 115                 //        inet_ntoa(eigrp->router_id));
 116
 117                 /* update eigrp_interface's */
 118                 FOR_ALL_INTERFACES (vrf, ifp)
 119                         eigrp_if_update(ifp);
 120         }
 121 }
 122
 123 void eigrp_master_init()
 124 {
 125         struct timeval tv;
 126
 127         memset(&eigrp_master, 0, sizeof(struct eigrp_master));
 128
 129         eigrp_om = &eigrp_master;
 130         eigrp_om->eigrp = list_new();
 131
 132         monotime(&tv);
 133         eigrp_om->start_time = tv.tv_sec;
 134 }
 135
 136 /* Allocate new eigrp structure. */
 137 static struct eigrp *eigrp_new(const char *AS)
 138 {
 139         struct eigrp *eigrp = XCALLOC(MTYPE_EIGRP_TOP, sizeof(struct eigrp));
 140         int eigrp_socket;
 141
 142         /* init information relevant to peers */
 143         eigrp->vrid = 0;
 144         eigrp->AS = atoi(AS);
 145         eigrp->router_id = 0L;
 146         eigrp->router_id_static = 0L;
 147         eigrp->sequence_number = 1;
 148
 149         /*Configure default K Values for EIGRP Process*/
 150         eigrp->k_values[0] = EIGRP_K1_DEFAULT;
 151         eigrp->k_values[1] = EIGRP_K2_DEFAULT;
 152         eigrp->k_values[2] = EIGRP_K3_DEFAULT;
 153         eigrp->k_values[3] = EIGRP_K4_DEFAULT;
 154         eigrp->k_values[4] = EIGRP_K5_DEFAULT;
 155         eigrp->k_values[5] = EIGRP_K6_DEFAULT;
 156
 157         /* init internal data structures */
 158         eigrp->eiflist = list_new();
 159         eigrp->passive_interface_default = EIGRP_IF_ACTIVE;
 160         eigrp->networks = eigrp_topology_new();
 161
 162         if ((eigrp_socket = eigrp_sock_init()) < 0) {
 163                 flog_err_sys(
 164                         EC_LIB_SOCKET,
 165                         "eigrp_new: fatal error: eigrp_sock_init was unable to open a socket");
 166                 exit(1);
 167         }
 168
 169         eigrp->fd = eigrp_socket;
 170         eigrp->maxsndbuflen = getsockopt_so_sendbuf(eigrp->fd);
 171
 172         eigrp->ibuf = stream_new(EIGRP_PACKET_MAX_LEN + 1);
 173
 174         eigrp->t_read = NULL;
 175         thread_add_read(master, eigrp_read, eigrp, eigrp->fd, &eigrp->t_read);
 176         eigrp->oi_write_q = list_new();
 177
 178         eigrp->topology_table = route_table_init();
 179
 180         eigrp->neighbor_self = eigrp_nbr_new(NULL);
 181         eigrp->neighbor_self->src.s_addr = INADDR_ANY;
 182
 183         eigrp->variance = EIGRP_VARIANCE_DEFAULT;
 184         eigrp->max_paths = EIGRP_MAX_PATHS_DEFAULT;
 185
 186         eigrp->serno = 0;
 187         eigrp->serno_last_update = 0;
 188         eigrp->topology_changes_externalIPV4 = list_new();
 189         eigrp->topology_changes_internalIPV4 = list_new();
 190
 191         eigrp->list[EIGRP_FILTER_IN] = NULL;
 192         eigrp->list[EIGRP_FILTER_OUT] = NULL;
 193
 194         eigrp->prefix[EIGRP_FILTER_IN] = NULL;
 195         eigrp->prefix[EIGRP_FILTER_OUT] = NULL;
 196
 197         eigrp->routemap[EIGRP_FILTER_IN] = NULL;
 198         eigrp->routemap[EIGRP_FILTER_OUT] = NULL;
 199
 200         QOBJ_REG(eigrp, eigrp);
 201         return eigrp;
 202 }
 203
 204 struct eigrp *eigrp_get(const char *AS)
 205 {
 206         struct eigrp *eigrp;
 207
 208         eigrp = eigrp_lookup();
 209         if (eigrp == NULL) {
 210                 eigrp = eigrp_new(AS);
 211                 listnode_add(eigrp_om->eigrp, eigrp);
 212         }
 213
 214         return eigrp;
 215 }
 216
 217 /* Shut down the entire process */
 218 void eigrp_terminate(void)
 219 {
 220         struct eigrp *eigrp;
 221         struct listnode *node, *nnode;
 222
 223         /* shutdown already in progress */
 224         if (CHECK_FLAG(eigrp_om->options, EIGRP_MASTER_SHUTDOWN))
 225                 return;
 226
 227         SET_FLAG(eigrp_om->options, EIGRP_MASTER_SHUTDOWN);
 228
 229         for (ALL_LIST_ELEMENTS(eigrp_om->eigrp, node, nnode, eigrp))
 230                 eigrp_finish(eigrp);
 231
 232         frr_fini();
 233 }
 234
 235 void eigrp_finish(struct eigrp *eigrp)
 236 {
 237         eigrp_finish_final(eigrp);
 238
 239         /* eigrp being shut-down? If so, was this the last eigrp instance? */
 240         if (CHECK_FLAG(eigrp_om->options, EIGRP_MASTER_SHUTDOWN)
 241             && (listcount(eigrp_om->eigrp) == 0)) {
 242                 if (zclient) {
 243                         zclient_stop(zclient);
 244                         zclient_free(zclient);
 245                 }
 246                 exit(0);
 247         }
 248
 249         return;
 250 }
 251
 252 /* Final cleanup of eigrp instance */
 253 void eigrp_finish_final(struct eigrp *eigrp)
 254 {
 255         struct eigrp_interface *ei;
 256         struct eigrp_neighbor *nbr;
 257         struct listnode *node, *nnode, *node2, *nnode2;
 258
 259         for (ALL_LIST_ELEMENTS(eigrp->eiflist, node, nnode, ei)) {
 260                 for (ALL_LIST_ELEMENTS(ei->nbrs, node2, nnode2, nbr))
 261                         eigrp_nbr_delete(nbr);
 262                 eigrp_if_free(ei, INTERFACE_DOWN_BY_FINAL);
 263         }
 264
 265         THREAD_OFF(eigrp->t_write);
 266         THREAD_OFF(eigrp->t_read);
 267         close(eigrp->fd);
 268
 269         list_delete(&eigrp->eiflist);
 270         list_delete(&eigrp->oi_write_q);
 271
 272         eigrp_topology_free(eigrp->topology_table);
 273
 274         eigrp_nbr_delete(eigrp->neighbor_self);
 275
 276         list_delete(&eigrp->topology_changes_externalIPV4);
 277         list_delete(&eigrp->topology_changes_internalIPV4);
 278
 279         listnode_delete(eigrp_om->eigrp, eigrp);
 280
 281         stream_free(eigrp->ibuf);
 282         XFREE(MTYPE_EIGRP_TOP, eigrp);
 283 }
 284
 285 /*Look for existing eigrp process*/
 286 struct eigrp *eigrp_lookup(void)
 287 {
 288         if (listcount(eigrp_om->eigrp) == 0)
 289                 return NULL;
 290
 291         return listgetdata(listhead(eigrp_om->eigrp));
 292 }