eigrpd/eigrp_zebra.c

   1 /*
   2  * Zebra connect library for EIGRP.
   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 "command.h"
  32 #include "network.h"
  33 #include "prefix.h"
  34 #include "routemap.h"
  35 #include "table.h"
  36 #include "stream.h"
  37 #include "memory.h"
  38 #include "zclient.h"
  39 #include "filter.h"
  40 #include "plist.h"
  41 #include "log.h"
  42 #include "nexthop.h"
  43
  44 #include "eigrpd/eigrp_structs.h"
  45 #include "eigrpd/eigrpd.h"
  46 #include "eigrpd/eigrp_interface.h"
  47 #include "eigrpd/eigrp_neighbor.h"
  48 #include "eigrpd/eigrp_packet.h"
  49 #include "eigrpd/eigrp_zebra.h"
  50 #include "eigrpd/eigrp_vty.h"
  51 #include "eigrpd/eigrp_dump.h"
  52 #include "eigrpd/eigrp_network.h"
  53 #include "eigrpd/eigrp_topology.h"
  54 #include "eigrpd/eigrp_fsm.h"
  55
  56 static int eigrp_interface_add(int, struct zclient *, zebra_size_t, vrf_id_t);
  57 static int eigrp_interface_delete(int, struct zclient *, zebra_size_t,
  58                                   vrf_id_t);
  59 static int eigrp_interface_address_add(int, struct zclient *, zebra_size_t,
  60                                        vrf_id_t vrf_id);
  61 static int eigrp_interface_address_delete(int, struct zclient *, zebra_size_t,
  62                                           vrf_id_t vrf_id);
  63 static int eigrp_interface_state_up(int, struct zclient *, zebra_size_t,
  64                                     vrf_id_t vrf_id);
  65 static int eigrp_interface_state_down(int, struct zclient *, zebra_size_t,
  66                                       vrf_id_t vrf_id);
  67 static struct interface *zebra_interface_if_lookup(struct stream *);
  68
  69 static int eigrp_zebra_read_route(int, struct zclient *, zebra_size_t,
  70                                   vrf_id_t vrf_id);
  71
  72 /* Zebra structure to hold current status. */
  73 struct zclient *zclient = NULL;
  74
  75 /* For registering threads. */
  76 extern struct thread_master *master;
  77 struct in_addr router_id_zebra;
  78
  79 /* Router-id update message from zebra. */
  80 static int eigrp_router_id_update_zebra(int command, struct zclient *zclient,
  81                                         zebra_size_t length, vrf_id_t vrf_id)
  82 {
  83         struct eigrp *eigrp;
  84         struct prefix router_id;
  85         zebra_router_id_update_read(zclient->ibuf, &router_id);
  86
  87         router_id_zebra = router_id.u.prefix4;
  88
  89         eigrp = eigrp_lookup();
  90
  91         if (eigrp != NULL)
  92                 eigrp_router_id_update(eigrp);
  93
  94         return 0;
  95 }
  96
  97 static int eigrp_zebra_route_notify_owner(int command, struct zclient *zclient,
  98                                           zebra_size_t length, vrf_id_t vrf_id)
  99 {
 100         struct prefix p;
 101         enum zapi_route_notify_owner note;
 102         uint32_t table;
 103
 104         if (!zapi_route_notify_decode(zclient->ibuf, &p, &table, &note))
 105                 return -1;
 106
 107         return 0;
 108 }
 109
 110 static void eigrp_zebra_connected(struct zclient *zclient)
 111 {
 112         zclient_send_reg_requests(zclient, VRF_DEFAULT);
 113 }
 114
 115 void eigrp_zebra_init(void)
 116 {
 117         struct zclient_options opt = {.receive_notify = false};
 118
 119         zclient = zclient_new(master, &opt);
 120
 121         zclient_init(zclient, ZEBRA_ROUTE_EIGRP, 0, &eigrpd_privs);
 122         zclient->zebra_connected = eigrp_zebra_connected;
 123         zclient->router_id_update = eigrp_router_id_update_zebra;
 124         zclient->interface_add = eigrp_interface_add;
 125         zclient->interface_delete = eigrp_interface_delete;
 126         zclient->interface_up = eigrp_interface_state_up;
 127         zclient->interface_down = eigrp_interface_state_down;
 128         zclient->interface_address_add = eigrp_interface_address_add;
 129         zclient->interface_address_delete = eigrp_interface_address_delete;
 130         zclient->redistribute_route_add = eigrp_zebra_read_route;
 131         zclient->redistribute_route_del = eigrp_zebra_read_route;
 132         zclient->route_notify_owner = eigrp_zebra_route_notify_owner;
 133 }
 134
 135
 136 /* Zebra route add and delete treatment. */
 137 static int eigrp_zebra_read_route(int command, struct zclient *zclient,
 138                                   zebra_size_t length, vrf_id_t vrf_id)
 139 {
 140         struct zapi_route api;
 141         struct eigrp *eigrp;
 142
 143         if (zapi_route_decode(zclient->ibuf, &api) < 0)
 144                 return -1;
 145
 146         if (IPV4_NET127(ntohl(api.prefix.u.prefix4.s_addr)))
 147                 return 0;
 148
 149         eigrp = eigrp_lookup();
 150         if (eigrp == NULL)
 151                 return 0;
 152
 153         if (command == ZEBRA_REDISTRIBUTE_ROUTE_ADD) {
 154
 155         } else /* if (command == ZEBRA_REDISTRIBUTE_ROUTE_DEL) */
 156         {
 157         }
 158
 159         return 0;
 160 }
 161
 162 /* Inteface addition message from zebra. */
 163 static int eigrp_interface_add(int command, struct zclient *zclient,
 164                                zebra_size_t length, vrf_id_t vrf_id)
 165 {
 166         struct interface *ifp;
 167         struct eigrp_interface *ei;
 168
 169         ifp = zebra_interface_add_read(zclient->ibuf, vrf_id);
 170
 171         if (!ifp->info)
 172                 return 0;
 173
 174         ei = ifp->info;
 175
 176         ei->params.type = eigrp_default_iftype(ifp);
 177
 178         eigrp_if_update(ifp);
 179
 180         return 0;
 181 }
 182
 183 static int eigrp_interface_delete(int command, struct zclient *zclient,
 184                                   zebra_size_t length, vrf_id_t vrf_id)
 185 {
 186         struct interface *ifp;
 187         struct stream *s;
 188
 189         s = zclient->ibuf;
 190         /* zebra_interface_state_read () updates interface structure in iflist
 191          */
 192         ifp = zebra_interface_state_read(s, vrf_id);
 193
 194         if (ifp == NULL)
 195                 return 0;
 196
 197         if (if_is_up(ifp))
 198                 zlog_warn("Zebra: got delete of %s, but interface is still up",
 199                           ifp->name);
 200
 201         if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE))
 202                 zlog_debug(
 203                         "Zebra: interface delete %s index %d flags %llx metric %d mtu %d",
 204                         ifp->name, ifp->ifindex, (unsigned long long)ifp->flags,
 205                         ifp->metric, ifp->mtu);
 206
 207         if (ifp->info)
 208                 eigrp_if_free(ifp->info, INTERFACE_DOWN_BY_ZEBRA);
 209
 210         if_set_index(ifp, IFINDEX_INTERNAL);
 211         return 0;
 212 }
 213
 214 static int eigrp_interface_address_add(int command, struct zclient *zclient,
 215                                        zebra_size_t length, vrf_id_t vrf_id)
 216 {
 217         struct connected *c;
 218
 219         c = zebra_interface_address_read(command, zclient->ibuf, vrf_id);
 220
 221         if (c == NULL)
 222                 return 0;
 223
 224         if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE)) {
 225                 char buf[128];
 226                 prefix2str(c->address, buf, sizeof(buf));
 227                 zlog_debug("Zebra: interface %s address add %s", c->ifp->name,
 228                            buf);
 229         }
 230
 231         eigrp_if_update(c->ifp);
 232
 233         return 0;
 234 }
 235
 236 static int eigrp_interface_address_delete(int command, struct zclient *zclient,
 237                                           zebra_size_t length, vrf_id_t vrf_id)
 238 {
 239         struct connected *c;
 240         struct interface *ifp;
 241         struct eigrp_interface *ei;
 242
 243         c = zebra_interface_address_read(command, zclient->ibuf, vrf_id);
 244
 245         if (c == NULL)
 246                 return 0;
 247
 248         if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE)) {
 249                 char buf[128];
 250                 prefix2str(c->address, buf, sizeof(buf));
 251                 zlog_debug("Zebra: interface %s address delete %s",
 252                            c->ifp->name, buf);
 253         }
 254
 255         ifp = c->ifp;
 256         ei = ifp->info;
 257         if (!ei)
 258                 return 0;
 259
 260         /* Call interface hook functions to clean up */
 261         eigrp_if_free(ei, INTERFACE_DOWN_BY_ZEBRA);
 262
 263         connected_free(c);
 264
 265         return 0;
 266 }
 267
 268 static int eigrp_interface_state_up(int command, struct zclient *zclient,
 269                                     zebra_size_t length, vrf_id_t vrf_id)
 270 {
 271         struct interface *ifp;
 272
 273         ifp = zebra_interface_if_lookup(zclient->ibuf);
 274
 275         if (ifp == NULL)
 276                 return 0;
 277
 278         /* Interface is already up. */
 279         if (if_is_operative(ifp)) {
 280                 /* Temporarily keep ifp values. */
 281                 struct interface if_tmp;
 282                 memcpy(&if_tmp, ifp, sizeof(struct interface));
 283
 284                 zebra_interface_if_set_value(zclient->ibuf, ifp);
 285
 286                 if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE))
 287                         zlog_debug("Zebra: Interface[%s] state update.",
 288                                    ifp->name);
 289
 290                 if (if_tmp.bandwidth != ifp->bandwidth) {
 291                         if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE))
 292                                 zlog_debug(
 293                                         "Zebra: Interface[%s] bandwidth change %d -> %d.",
 294                                         ifp->name, if_tmp.bandwidth,
 295                                         ifp->bandwidth);
 296
 297                         //          eigrp_if_recalculate_output_cost (ifp);
 298                 }
 299
 300                 if (if_tmp.mtu != ifp->mtu) {
 301                         if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE))
 302                                 zlog_debug(
 303                                         "Zebra: Interface[%s] MTU change %u -> %u.",
 304                                         ifp->name, if_tmp.mtu, ifp->mtu);
 305
 306                         /* Must reset the interface (simulate down/up) when MTU
 307                          * changes. */
 308                         eigrp_if_reset(ifp);
 309                 }
 310                 return 0;
 311         }
 312
 313         zebra_interface_if_set_value(zclient->ibuf, ifp);
 314
 315         if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE))
 316                 zlog_debug("Zebra: Interface[%s] state change to up.",
 317                            ifp->name);
 318
 319         if (ifp->info)
 320                 eigrp_if_up(ifp->info);
 321
 322         return 0;
 323 }
 324
 325 static int eigrp_interface_state_down(int command, struct zclient *zclient,
 326                                       zebra_size_t length, vrf_id_t vrf_id)
 327 {
 328         struct interface *ifp;
 329
 330         ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
 331
 332         if (ifp == NULL)
 333                 return 0;
 334
 335         if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE))
 336                 zlog_debug("Zebra: Interface[%s] state change to down.",
 337                            ifp->name);
 338
 339         if (ifp->info)
 340                 eigrp_if_down(ifp->info);
 341
 342         return 0;
 343 }
 344
 345 static struct interface *zebra_interface_if_lookup(struct stream *s)
 346 {
 347         char ifname_tmp[INTERFACE_NAMSIZ];
 348
 349         /* Read interface name. */
 350         stream_get(ifname_tmp, s, INTERFACE_NAMSIZ);
 351
 352         /* And look it up. */
 353         return if_lookup_by_name(ifname_tmp, VRF_DEFAULT);
 354 }
 355
 356 void eigrp_zebra_route_add(struct prefix *p, struct list *successors)
 357 {
 358         struct zapi_route api;
 359         struct zapi_nexthop *api_nh;
 360         struct eigrp_nexthop_entry *te;
 361         struct listnode *node;
 362         int count = 0;
 363
 364         if (!zclient->redist[AFI_IP][ZEBRA_ROUTE_EIGRP])
 365                 return;
 366
 367         memset(&api, 0, sizeof(api));
 368         api.vrf_id = VRF_DEFAULT;
 369         api.type = ZEBRA_ROUTE_EIGRP;
 370         api.safi = SAFI_UNICAST;
 371         memcpy(&api.prefix, p, sizeof(*p));
 372
 373         SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
 374
 375         /* Nexthop, ifindex, distance and metric information. */
 376         for (ALL_LIST_ELEMENTS_RO(successors, node, te)) {
 377                 if (count >= MULTIPATH_NUM)
 378                         break;
 379                 api_nh = &api.nexthops[count];
 380                 api_nh->vrf_id = VRF_DEFAULT;
 381                 if (te->adv_router->src.s_addr) {
 382                         api_nh->gate.ipv4 = te->adv_router->src;
 383                         api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
 384                 } else
 385                         api_nh->type = NEXTHOP_TYPE_IFINDEX;
 386                 api_nh->ifindex = te->ei->ifp->ifindex;
 387
 388                 count++;
 389         }
 390         api.nexthop_num = count;
 391
 392         if (IS_DEBUG_EIGRP(zebra, ZEBRA_REDISTRIBUTE)) {
 393                 char buf[2][PREFIX_STRLEN];
 394                 zlog_debug("Zebra: Route add %s nexthop %s",
 395                            prefix2str(p, buf[0], PREFIX_STRLEN),
 396                            inet_ntop(AF_INET, 0, buf[1], PREFIX_STRLEN));
 397         }
 398
 399         zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api);
 400 }
 401
 402 void eigrp_zebra_route_delete(struct prefix *p)
 403 {
 404         struct zapi_route api;
 405
 406         if (!zclient->redist[AFI_IP][ZEBRA_ROUTE_EIGRP])
 407                 return;
 408
 409         memset(&api, 0, sizeof(api));
 410         api.vrf_id = VRF_DEFAULT;
 411         api.type = ZEBRA_ROUTE_EIGRP;
 412         api.safi = SAFI_UNICAST;
 413         memcpy(&api.prefix, p, sizeof(*p));
 414         zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
 415
 416         if (IS_DEBUG_EIGRP(zebra, ZEBRA_REDISTRIBUTE)) {
 417                 char buf[PREFIX_STRLEN];
 418                 zlog_debug("Zebra: Route del %s",
 419                            prefix2str(p, buf, PREFIX_STRLEN));
 420         }
 421
 422         return;
 423 }
 424
 425 int eigrp_is_type_redistributed(int type)
 426 {
 427         return ((DEFAULT_ROUTE_TYPE(type))
 428                         ? vrf_bitmap_check(zclient->default_information,
 429                                            VRF_DEFAULT)
 430                         : vrf_bitmap_check(zclient->redist[AFI_IP][type],
 431                                            VRF_DEFAULT));
 432 }
 433
 434 int eigrp_redistribute_set(struct eigrp *eigrp, int type,
 435                            struct eigrp_metrics metric)
 436 {
 437
 438         if (eigrp_is_type_redistributed(type)) {
 439                 if (eigrp_metrics_is_same(metric, eigrp->dmetric[type])) {
 440                         eigrp->dmetric[type] = metric;
 441                 }
 442
 443                 eigrp_external_routes_refresh(eigrp, type);
 444
 445                 //      if (IS_DEBUG_EIGRP(zebra, ZEBRA_REDISTRIBUTE))
 446                 //        zlog_debug ("Redistribute[%s]: Refresh  Type[%d],
 447                 //        Metric[%d]",
 448                 //                   eigrp_redist_string(type),
 449                 //                   metric_type (eigrp, type), metric_value
 450                 //                   (eigrp, type));
 451                 return CMD_SUCCESS;
 452         }
 453
 454         eigrp->dmetric[type] = metric;
 455
 456         zclient_redistribute(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP, type, 0,
 457                              VRF_DEFAULT);
 458
 459         ++eigrp->redistribute;
 460
 461         return CMD_SUCCESS;
 462 }
 463
 464 int eigrp_redistribute_unset(struct eigrp *eigrp, int type)
 465 {
 466
 467         if (eigrp_is_type_redistributed(type)) {
 468                 memset(&eigrp->dmetric[type], 0, sizeof(struct eigrp_metrics));
 469                 zclient_redistribute(ZEBRA_REDISTRIBUTE_DELETE, zclient, AFI_IP,
 470                                      type, 0, VRF_DEFAULT);
 471                 --eigrp->redistribute;
 472         }
 473
 474         return CMD_SUCCESS;
 475 }