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 #include "distribute.h"
  48
  49 #include "eigrpd/eigrp_structs.h"
  50 #include "eigrpd/eigrpd.h"
  51 #include "eigrpd/eigrp_interface.h"
  52 #include "eigrpd/eigrp_zebra.h"
  53 #include "eigrpd/eigrp_vty.h"
  54 #include "eigrpd/eigrp_neighbor.h"
  55 #include "eigrpd/eigrp_packet.h"
  56 #include "eigrpd/eigrp_network.h"
  57 #include "eigrpd/eigrp_topology.h"
  58 #include "eigrpd/eigrp_memory.h"
  59 #include "eigrpd/eigrp_filter.h"
  60
  61 DEFINE_QOBJ_TYPE(eigrp)
  62
  63 static struct eigrp_master eigrp_master;
  64
  65 struct eigrp_master *eigrp_om;
  66
  67 static struct eigrp *eigrp_new(const char *);
  68
  69 extern struct zclient *zclient;
  70 extern struct in_addr router_id_zebra;
  71
  72
  73 /*
  74  * void eigrp_router_id_update(struct eigrp *eigrp)
  75  *
  76  * Description:
  77  * update routerid associated with this instance of EIGRP.
  78  * If the id changes, then call if_update for each interface
  79  * to resync the topology database with all neighbors
  80  *
  81  * Select the router ID based on these priorities:
  82  *   1. Statically assigned router ID is always the first choice.
  83  *   2. If there is no statically assigned router ID, then try to stick
  84  *      with the most recent value, since changing router ID's is very
  85  *      disruptive.
  86  *   3. Last choice: just go with whatever the zebra daemon recommends.
  87  *
  88  * Note:
  89  * router id for EIGRP is really just a 32 bit number. Cisco historically
  90  * displays it in dotted decimal notation, and will pickup an IP address
  91  * from an interface so it can be 'auto-configed" to a uniqe value
  92  *
  93  * This does not work for IPv6, and to make the code simpler, its
  94  * stored and processed internerall as a 32bit number
  95  */
  96 void eigrp_router_id_update(struct eigrp *eigrp)
  97 {
  98         struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT);
  99         struct interface *ifp;
 100         struct in_addr router_id, router_id_old;
 101
 102         router_id_old = eigrp->router_id;
 103
 104         if (eigrp->router_id_static.s_addr != 0)
 105                 router_id = eigrp->router_id_static;
 106
 107         else if (eigrp->router_id.s_addr != 0)
 108                 router_id = eigrp->router_id;
 109
 110         else
 111                 router_id = router_id_zebra;
 112
 113         eigrp->router_id = router_id;
 114         if (router_id_old.s_addr != router_id.s_addr) {
 115                 //      if (IS_DEBUG_EIGRP_EVENT)
 116                 //        zlog_debug("Router-ID[NEW:%s]: Update",
 117                 //        inet_ntoa(eigrp->router_id));
 118
 119                 /* update eigrp_interface's */
 120                 FOR_ALL_INTERFACES (vrf, ifp)
 121                         eigrp_if_update(ifp);
 122         }
 123 }
 124
 125 void eigrp_master_init()
 126 {
 127         struct timeval tv;
 128
 129         memset(&eigrp_master, 0, sizeof(struct eigrp_master));
 130
 131         eigrp_om = &eigrp_master;
 132         eigrp_om->eigrp = list_new();
 133
 134         monotime(&tv);
 135         eigrp_om->start_time = tv.tv_sec;
 136 }
 137
 138 /* Allocate new eigrp structure. */
 139 static struct eigrp *eigrp_new(const char *AS)
 140 {
 141         struct eigrp *eigrp = XCALLOC(MTYPE_EIGRP_TOP, sizeof(struct eigrp));
 142         int eigrp_socket;
 143
 144         /* init information relevant to peers */
 145         eigrp->vrid = 0;
 146         eigrp->AS = atoi(AS);
 147         eigrp->router_id.s_addr = 0;
 148         eigrp->router_id_static.s_addr = 0;
 149         eigrp->sequence_number = 1;
 150
 151         /*Configure default K Values for EIGRP Process*/
 152         eigrp->k_values[0] = EIGRP_K1_DEFAULT;
 153         eigrp->k_values[1] = EIGRP_K2_DEFAULT;
 154         eigrp->k_values[2] = EIGRP_K3_DEFAULT;
 155         eigrp->k_values[3] = EIGRP_K4_DEFAULT;
 156         eigrp->k_values[4] = EIGRP_K5_DEFAULT;
 157         eigrp->k_values[5] = EIGRP_K6_DEFAULT;
 158
 159         /* init internal data structures */
 160         eigrp->eiflist = list_new();
 161         eigrp->passive_interface_default = EIGRP_IF_ACTIVE;
 162         eigrp->networks = eigrp_topology_new();
 163
 164         if ((eigrp_socket = eigrp_sock_init()) < 0) {
 165                 flog_err_sys(
 166                         EC_LIB_SOCKET,
 167                         "eigrp_new: fatal error: eigrp_sock_init was unable to open a socket");
 168                 exit(1);
 169         }
 170
 171         eigrp->fd = eigrp_socket;
 172         eigrp->maxsndbuflen = getsockopt_so_sendbuf(eigrp->fd);
 173
 174         eigrp->ibuf = stream_new(EIGRP_PACKET_MAX_LEN + 1);
 175
 176         eigrp->t_read = NULL;
 177         thread_add_read(master, eigrp_read, eigrp, eigrp->fd, &eigrp->t_read);
 178         eigrp->oi_write_q = list_new();
 179
 180         eigrp->topology_table = route_table_init();
 181
 182         eigrp->neighbor_self = eigrp_nbr_new(NULL);
 183         eigrp->neighbor_self->src.s_addr = INADDR_ANY;
 184
 185         eigrp->variance = EIGRP_VARIANCE_DEFAULT;
 186         eigrp->max_paths = EIGRP_MAX_PATHS_DEFAULT;
 187
 188         eigrp->serno = 0;
 189         eigrp->serno_last_update = 0;
 190         eigrp->topology_changes_externalIPV4 = list_new();
 191         eigrp->topology_changes_internalIPV4 = list_new();
 192
 193         eigrp->list[EIGRP_FILTER_IN] = NULL;
 194         eigrp->list[EIGRP_FILTER_OUT] = NULL;
 195
 196         eigrp->prefix[EIGRP_FILTER_IN] = NULL;
 197         eigrp->prefix[EIGRP_FILTER_OUT] = NULL;
 198
 199         eigrp->routemap[EIGRP_FILTER_IN] = NULL;
 200         eigrp->routemap[EIGRP_FILTER_OUT] = NULL;
 201
 202         /* Distribute list install. */
 203         eigrp->distribute_ctx = distribute_list_ctx_create(
 204                                            vrf_lookup_by_id(VRF_DEFAULT));
 205         distribute_list_add_hook(eigrp->distribute_ctx,
 206                                  eigrp_distribute_update);
 207         distribute_list_delete_hook(eigrp->distribute_ctx,
 208                                     eigrp_distribute_update);
 209         QOBJ_REG(eigrp, eigrp);
 210         return eigrp;
 211 }
 212
 213 struct eigrp *eigrp_get(const char *AS)
 214 {
 215         struct eigrp *eigrp;
 216
 217         eigrp = eigrp_lookup();
 218         if (eigrp == NULL) {
 219                 eigrp = eigrp_new(AS);
 220                 listnode_add(eigrp_om->eigrp, eigrp);
 221         }
 222
 223         return eigrp;
 224 }
 225
 226 /* Shut down the entire process */
 227 void eigrp_terminate(void)
 228 {
 229         struct eigrp *eigrp;
 230         struct listnode *node, *nnode;
 231
 232         /* shutdown already in progress */
 233         if (CHECK_FLAG(eigrp_om->options, EIGRP_MASTER_SHUTDOWN))
 234                 return;
 235
 236         SET_FLAG(eigrp_om->options, EIGRP_MASTER_SHUTDOWN);
 237
 238         for (ALL_LIST_ELEMENTS(eigrp_om->eigrp, node, nnode, eigrp))
 239                 eigrp_finish(eigrp);
 240
 241         frr_fini();
 242 }
 243
 244 void eigrp_finish(struct eigrp *eigrp)
 245 {
 246         eigrp_finish_final(eigrp);
 247
 248         /* eigrp being shut-down? If so, was this the last eigrp instance? */
 249         if (CHECK_FLAG(eigrp_om->options, EIGRP_MASTER_SHUTDOWN)
 250             && (listcount(eigrp_om->eigrp) == 0)) {
 251                 if (zclient) {
 252                         zclient_stop(zclient);
 253                         zclient_free(zclient);
 254                 }
 255                 exit(0);
 256         }
 257
 258         return;
 259 }
 260
 261 /* Final cleanup of eigrp instance */
 262 void eigrp_finish_final(struct eigrp *eigrp)
 263 {
 264         struct eigrp_interface *ei;
 265         struct eigrp_neighbor *nbr;
 266         struct listnode *node, *nnode, *node2, *nnode2;
 267
 268         for (ALL_LIST_ELEMENTS(eigrp->eiflist, node, nnode, ei)) {
 269                 for (ALL_LIST_ELEMENTS(ei->nbrs, node2, nnode2, nbr))
 270                         eigrp_nbr_delete(nbr);
 271                 eigrp_if_free(ei, INTERFACE_DOWN_BY_FINAL);
 272         }
 273
 274         THREAD_OFF(eigrp->t_write);
 275         THREAD_OFF(eigrp->t_read);
 276         close(eigrp->fd);
 277
 278         list_delete(&eigrp->eiflist);
 279         list_delete(&eigrp->oi_write_q);
 280
 281         eigrp_topology_free(eigrp->topology_table);
 282
 283         eigrp_nbr_delete(eigrp->neighbor_self);
 284
 285         list_delete(&eigrp->topology_changes_externalIPV4);
 286         list_delete(&eigrp->topology_changes_internalIPV4);
 287
 288         listnode_delete(eigrp_om->eigrp, eigrp);
 289
 290         stream_free(eigrp->ibuf);
 291         distribute_list_delete(&eigrp->distribute_ctx);
 292         XFREE(MTYPE_EIGRP_TOP, eigrp);
 293 }
 294
 295 /*Look for existing eigrp process*/
 296 struct eigrp *eigrp_lookup(void)
 297 {
 298         if (listcount(eigrp_om->eigrp) == 0)
 299                 return NULL;
 300
 301         return listgetdata(listhead(eigrp_om->eigrp));
 302 }