eigrpd/eigrp_interface.c

   1 /*
   2  * EIGRP Interface Functions.
   3  * Copyright (C) 2013-2016
   4  * Authors:
   5  *   Donnie Savage
   6  *   Jan Janovic
   7  *   Matej Perina
   8  *   Peter Orsag
   9  *   Peter Paluch
  10  *   Frantisek Gazo
  11  *   Tomas Hvorkovy
  12  *   Martin Kontsek
  13  *   Lukas Koribsky
  14  *
  15  * This file is part of GNU Zebra.
  16  *
  17  * GNU Zebra is free software; you can redistribute it and/or modify it
  18  * under the terms of the GNU General Public License as published by the
  19  * Free Software Foundation; either version 2, or (at your option) any
  20  * later version.
  21  *
  22  * GNU Zebra is distributed in the hope that it will be useful, but
  23  * WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  25  * General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License along
  28  * with this program; see the file COPYING; if not, write to the Free Software
  29  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  30  */
  31
  32 #include <zebra.h>
  33
  34 #include "thread.h"
  35 #include "linklist.h"
  36 #include "prefix.h"
  37 #include "if.h"
  38 #include "table.h"
  39 #include "memory.h"
  40 #include "command.h"
  41 #include "stream.h"
  42 #include "log.h"
  43 #include "keychain.h"
  44 #include "vrf.h"
  45
  46 #include "eigrpd/eigrp_structs.h"
  47 #include "eigrpd/eigrpd.h"
  48 #include "eigrpd/eigrp_interface.h"
  49 #include "eigrpd/eigrp_neighbor.h"
  50 #include "eigrpd/eigrp_packet.h"
  51 #include "eigrpd/eigrp_zebra.h"
  52 #include "eigrpd/eigrp_vty.h"
  53 #include "eigrpd/eigrp_network.h"
  54 #include "eigrpd/eigrp_topology.h"
  55 #include "eigrpd/eigrp_memory.h"
  56 #include "eigrpd/eigrp_fsm.h"
  57
  58 struct eigrp_interface *eigrp_if_new(struct eigrp *eigrp, struct interface *ifp,
  59                                      struct prefix *p)
  60 {
  61         struct eigrp_interface *ei = ifp->info;
  62         int i;
  63
  64         if (ei)
  65                 return ei;
  66
  67         ei = XCALLOC(MTYPE_EIGRP_IF, sizeof(struct eigrp_interface));
  68
  69         /* Set zebra interface pointer. */
  70         ei->ifp = ifp;
  71         ei->address = p;
  72
  73         ifp->info = ei;
  74         listnode_add(eigrp->eiflist, ei);
  75
  76         ei->type = EIGRP_IFTYPE_BROADCAST;
  77
  78         /* Initialize neighbor list. */
  79         ei->nbrs = list_new();
  80
  81         ei->crypt_seqnum = time(NULL);
  82
  83         /* Initialize lists */
  84         for (i = 0; i < EIGRP_FILTER_MAX; i++) {
  85                 ei->list[i] = NULL;
  86                 ei->prefix[i] = NULL;
  87                 ei->routemap[i] = NULL;
  88         }
  89
  90         ei->eigrp = eigrp;
  91
  92         ei->params.v_hello = EIGRP_HELLO_INTERVAL_DEFAULT;
  93         ei->params.v_wait = EIGRP_HOLD_INTERVAL_DEFAULT;
  94         ei->params.bandwidth = EIGRP_BANDWIDTH_DEFAULT;
  95         ei->params.delay = EIGRP_DELAY_DEFAULT;
  96         ei->params.reliability = EIGRP_RELIABILITY_DEFAULT;
  97         ei->params.load = EIGRP_LOAD_DEFAULT;
  98         ei->params.auth_type = EIGRP_AUTH_TYPE_NONE;
  99         ei->params.auth_keychain = NULL;
 100
 101         return ei;
 102 }
 103
 104 int eigrp_if_delete_hook(struct interface *ifp)
 105 {
 106         struct eigrp_interface *ei = ifp->info;
 107         struct eigrp *eigrp;
 108
 109         if (!ei)
 110                 return 0;
 111
 112         list_delete(&ei->nbrs);
 113
 114         eigrp = ei->eigrp;
 115         listnode_delete(eigrp->eiflist, ei);
 116
 117         XFREE(MTYPE_EIGRP_IF_INFO, ifp->info);
 118         ifp->info = NULL;
 119
 120         return 0;
 121 }
 122
 123 struct list *eigrp_iflist;
 124
 125 void eigrp_if_init()
 126 {
 127         /* Initialize Zebra interface data structure. */
 128         // hook_register_prio(if_add, 0, eigrp_if_new);
 129         hook_register_prio(if_del, 0, eigrp_if_delete_hook);
 130 }
 131
 132
 133 void eigrp_del_if_params(struct eigrp_if_params *eip)
 134 {
 135         if (eip->auth_keychain)
 136                 free(eip->auth_keychain);
 137 }
 138
 139 int eigrp_if_up(struct eigrp_interface *ei)
 140 {
 141         struct eigrp_prefix_entry *pe;
 142         struct eigrp_nexthop_entry *ne;
 143         struct eigrp_metrics metric;
 144         struct eigrp_interface *ei2;
 145         struct listnode *node, *nnode;
 146         struct eigrp *eigrp;
 147
 148         if (ei == NULL)
 149                 return 0;
 150
 151         eigrp = ei->eigrp;
 152         eigrp_adjust_sndbuflen(eigrp, ei->ifp->mtu);
 153
 154         eigrp_if_stream_set(ei);
 155
 156         /* Set multicast memberships appropriately for new state. */
 157         eigrp_if_set_multicast(ei);
 158
 159         thread_add_event(master, eigrp_hello_timer, ei, (1), NULL);
 160
 161         /*Prepare metrics*/
 162         metric.bandwidth = eigrp_bandwidth_to_scaled(ei->params.bandwidth);
 163         metric.delay = eigrp_delay_to_scaled(ei->params.delay);
 164         metric.load = ei->params.load;
 165         metric.reliability = ei->params.reliability;
 166         metric.mtu[0] = 0xDC;
 167         metric.mtu[1] = 0x05;
 168         metric.mtu[2] = 0x00;
 169         metric.hop_count = 0;
 170         metric.flags = 0;
 171         metric.tag = 0;
 172
 173         /*Add connected entry to topology table*/
 174
 175         ne = eigrp_nexthop_entry_new();
 176         ne->ei = ei;
 177         ne->reported_metric = metric;
 178         ne->total_metric = metric;
 179         ne->distance = eigrp_calculate_metrics(eigrp, metric);
 180         ne->reported_distance = 0;
 181         ne->adv_router = eigrp->neighbor_self;
 182         ne->flags = EIGRP_NEXTHOP_ENTRY_SUCCESSOR_FLAG;
 183
 184         struct prefix dest_addr;
 185
 186         dest_addr = *ei->address;
 187         apply_mask(&dest_addr);
 188         pe = eigrp_topology_table_lookup_ipv4(eigrp->topology_table,
 189                                               &dest_addr);
 190
 191         if (pe == NULL) {
 192                 pe = eigrp_prefix_entry_new();
 193                 pe->serno = eigrp->serno;
 194                 pe->destination = (struct prefix *)prefix_ipv4_new();
 195                 prefix_copy(pe->destination, &dest_addr);
 196                 pe->af = AF_INET;
 197                 pe->nt = EIGRP_TOPOLOGY_TYPE_CONNECTED;
 198
 199                 ne->prefix = pe;
 200                 pe->reported_metric = metric;
 201                 pe->state = EIGRP_FSM_STATE_PASSIVE;
 202                 pe->fdistance = eigrp_calculate_metrics(eigrp, metric);
 203                 pe->req_action |= EIGRP_FSM_NEED_UPDATE;
 204                 eigrp_prefix_entry_add(eigrp->topology_table, pe);
 205                 listnode_add(eigrp->topology_changes_internalIPV4, pe);
 206
 207                 eigrp_nexthop_entry_add(pe, ne);
 208
 209                 for (ALL_LIST_ELEMENTS(eigrp->eiflist, node, nnode, ei2)) {
 210                         eigrp_update_send(ei2);
 211                 }
 212
 213                 pe->req_action &= ~EIGRP_FSM_NEED_UPDATE;
 214                 listnode_delete(eigrp->topology_changes_internalIPV4, pe);
 215         } else {
 216                 struct eigrp_fsm_action_message msg;
 217
 218                 ne->prefix = pe;
 219                 eigrp_nexthop_entry_add(pe, ne);
 220
 221                 msg.packet_type = EIGRP_OPC_UPDATE;
 222                 msg.eigrp = eigrp;
 223                 msg.data_type = EIGRP_CONNECTED;
 224                 msg.adv_router = NULL;
 225                 msg.entry = ne;
 226                 msg.prefix = pe;
 227
 228                 eigrp_fsm_event(&msg);
 229         }
 230
 231         return 1;
 232 }
 233
 234 int eigrp_if_down(struct eigrp_interface *ei)
 235 {
 236         struct listnode *node, *nnode;
 237         struct eigrp_neighbor *nbr;
 238
 239         if (ei == NULL)
 240                 return 0;
 241
 242         /* Shutdown packet reception and sending */
 243         if (ei->t_hello)
 244                 THREAD_OFF(ei->t_hello);
 245
 246         eigrp_if_stream_unset(ei);
 247
 248         /*Set infinite metrics to routes learned by this interface and start
 249          * query process*/
 250         for (ALL_LIST_ELEMENTS(ei->nbrs, node, nnode, nbr)) {
 251                 eigrp_nbr_delete(nbr);
 252         }
 253
 254         return 1;
 255 }
 256
 257 void eigrp_if_stream_set(struct eigrp_interface *ei)
 258 {
 259         /* set output fifo queue. */
 260         if (ei->obuf == NULL)
 261                 ei->obuf = eigrp_fifo_new();
 262 }
 263
 264 void eigrp_if_stream_unset(struct eigrp_interface *ei)
 265 {
 266         struct eigrp *eigrp = ei->eigrp;
 267
 268         if (ei->obuf) {
 269                 eigrp_fifo_free(ei->obuf);
 270                 ei->obuf = NULL;
 271
 272                 if (ei->on_write_q) {
 273                         listnode_delete(eigrp->oi_write_q, ei);
 274                         if (list_isempty(eigrp->oi_write_q))
 275                                 thread_cancel(eigrp->t_write);
 276                         ei->on_write_q = 0;
 277                 }
 278         }
 279 }
 280
 281 bool eigrp_if_is_passive(struct eigrp_interface *ei)
 282 {
 283         if (ei->params.passive_interface == EIGRP_IF_ACTIVE)
 284                 return false;
 285
 286         if (ei->eigrp->passive_interface_default == EIGRP_IF_ACTIVE)
 287                 return false;
 288
 289         return true;
 290 }
 291
 292 void eigrp_if_set_multicast(struct eigrp_interface *ei)
 293 {
 294         if (!eigrp_if_is_passive(ei)) {
 295                 /* The interface should belong to the EIGRP-all-routers group.
 296                  */
 297                 if (!ei->member_allrouters
 298                     && (eigrp_if_add_allspfrouters(ei->eigrp, ei->address,
 299                                                    ei->ifp->ifindex)
 300                         >= 0))
 301                         /* Set the flag only if the system call to join
 302                          * succeeded. */
 303                         ei->member_allrouters = true;
 304         } else {
 305                 /* The interface should NOT belong to the EIGRP-all-routers
 306                  * group. */
 307                 if (ei->member_allrouters) {
 308                         /* Only actually drop if this is the last reference */
 309                         eigrp_if_drop_allspfrouters(ei->eigrp, ei->address,
 310                                                     ei->ifp->ifindex);
 311                         /* Unset the flag regardless of whether the system call
 312                            to leave
 313                            the group succeeded, since it's much safer to assume
 314                            that
 315                            we are not a member. */
 316                         ei->member_allrouters = false;
 317                 }
 318         }
 319 }
 320
 321 uint8_t eigrp_default_iftype(struct interface *ifp)
 322 {
 323         if (if_is_pointopoint(ifp))
 324                 return EIGRP_IFTYPE_POINTOPOINT;
 325         else if (if_is_loopback(ifp))
 326                 return EIGRP_IFTYPE_LOOPBACK;
 327         else
 328                 return EIGRP_IFTYPE_BROADCAST;
 329 }
 330
 331 void eigrp_if_free(struct eigrp_interface *ei, int source)
 332 {
 333         struct prefix dest_addr;
 334         struct eigrp_prefix_entry *pe;
 335         struct eigrp *eigrp = eigrp_lookup();
 336
 337         if (!eigrp)
 338                 return;
 339
 340         if (source == INTERFACE_DOWN_BY_VTY) {
 341                 THREAD_OFF(ei->t_hello);
 342                 eigrp_hello_send(ei, EIGRP_HELLO_GRACEFUL_SHUTDOWN, NULL);
 343         }
 344
 345         dest_addr = *ei->address;
 346         apply_mask(&dest_addr);
 347         pe = eigrp_topology_table_lookup_ipv4(eigrp->topology_table,
 348                                               &dest_addr);
 349         if (pe)
 350                 eigrp_prefix_entry_delete(eigrp->topology_table, pe);
 351
 352         eigrp_if_down(ei);
 353
 354         list_delete(&ei->nbrs);
 355         listnode_delete(ei->eigrp->eiflist, ei);
 356 }
 357
 358 /* Simulate down/up on the interface.  This is needed, for example, when
 359    the MTU changes. */
 360 void eigrp_if_reset(struct interface *ifp)
 361 {
 362         struct eigrp_interface *ei = ifp->info;
 363
 364         if (!ei)
 365                 return;
 366
 367         eigrp_if_down(ei);
 368         eigrp_if_up(ei);
 369 }
 370
 371 struct eigrp_interface *eigrp_if_lookup_by_local_addr(struct eigrp *eigrp,
 372                                                       struct interface *ifp,
 373                                                       struct in_addr address)
 374 {
 375         struct listnode *node;
 376         struct eigrp_interface *ei;
 377
 378         for (ALL_LIST_ELEMENTS_RO(eigrp->eiflist, node, ei)) {
 379                 if (ifp && ei->ifp != ifp)
 380                         continue;
 381
 382                 if (IPV4_ADDR_SAME(&address, &ei->address->u.prefix4))
 383                         return ei;
 384         }
 385
 386         return NULL;
 387 }
 388
 389 /**
 390  * @fn eigrp_if_lookup_by_name
 391  *
 392  * @param[in]           eigrp           EIGRP process
 393  * @param[in]           if_name         Name of the interface
 394  *
 395  * @return struct eigrp_interface *
 396  *
 397  * @par
 398  * Function is used for lookup interface by name.
 399  */
 400 struct eigrp_interface *eigrp_if_lookup_by_name(struct eigrp *eigrp,
 401                                                 const char *if_name)
 402 {
 403         struct eigrp_interface *ei;
 404         struct listnode *node;
 405
 406         /* iterate over all eigrp interfaces */
 407         for (ALL_LIST_ELEMENTS_RO(eigrp->eiflist, node, ei)) {
 408                 /* compare int name with eigrp interface's name */
 409                 if (strcmp(ei->ifp->name, if_name) == 0) {
 410                         return ei;
 411                 }
 412         }
 413
 414         return NULL;
 415 }
 416
 417 uint32_t eigrp_bandwidth_to_scaled(uint32_t bandwidth)
 418 {
 419         uint64_t temp_bandwidth = (256ull * 10000000) / bandwidth;
 420
 421         temp_bandwidth = temp_bandwidth < EIGRP_MAX_METRIC ? temp_bandwidth
 422                                                            : EIGRP_MAX_METRIC;
 423
 424         return (uint32_t)temp_bandwidth;
 425 }
 426
 427 uint32_t eigrp_scaled_to_bandwidth(uint32_t scaled)
 428 {
 429         uint64_t temp_scaled = scaled * (256ull * 10000000);
 430
 431         temp_scaled =
 432                 temp_scaled < EIGRP_MAX_METRIC ? temp_scaled : EIGRP_MAX_METRIC;
 433
 434         return (uint32_t)temp_scaled;
 435 }
 436
 437 uint32_t eigrp_delay_to_scaled(uint32_t delay)
 438 {
 439         return delay * 256;
 440 }
 441
 442 uint32_t eigrp_scaled_to_delay(uint32_t scaled)
 443 {
 444         return scaled / 256;
 445 }