isisd/isis_zebra.c

   1 /*
   2  * IS-IS Rout(e)ing protocol - isis_zebra.c
   3  *
   4  * Copyright (C) 2001,2002   Sampo Saaristo
   5  *                           Tampere University of Technology
   6  *                           Institute of Communications Engineering
   7  * Copyright (C) 2013-2015   Christian Franke <chris@opensourcerouting.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public Licenseas published by the Free
  11  * Software Foundation; either version 2 of the License, or (at your option)
  12  * any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  17  * more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; see the file COPYING; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #include <zebra.h>
  25
  26 #include "thread.h"
  27 #include "command.h"
  28 #include "memory.h"
  29 #include "log.h"
  30 #include "if.h"
  31 #include "network.h"
  32 #include "prefix.h"
  33 #include "zclient.h"
  34 #include "stream.h"
  35 #include "linklist.h"
  36 #include "nexthop.h"
  37 #include "vrf.h"
  38 #include "libfrr.h"
  39
  40 #include "isisd/dict.h"
  41 #include "isisd/isis_constants.h"
  42 #include "isisd/isis_common.h"
  43 #include "isisd/isis_flags.h"
  44 #include "isisd/isis_misc.h"
  45 #include "isisd/isis_circuit.h"
  46 #include "isisd/isisd.h"
  47 #include "isisd/isis_circuit.h"
  48 #include "isisd/isis_csm.h"
  49 #include "isisd/isis_lsp.h"
  50 #include "isisd/isis_route.h"
  51 #include "isisd/isis_zebra.h"
  52 #include "isisd/isis_te.h"
  53
  54 struct zclient *zclient = NULL;
  55
  56 /* Router-id update message from zebra. */
  57 static int isis_router_id_update_zebra(int command, struct zclient *zclient,
  58                                        zebra_size_t length, vrf_id_t vrf_id)
  59 {
  60         struct isis_area *area;
  61         struct listnode *node;
  62         struct prefix router_id;
  63
  64         /*
  65          * If ISIS TE is enable, TE Router ID is set through specific command.
  66          * See mpls_te_router_addr() command in isis_te.c
  67          */
  68         if (IS_MPLS_TE(isisMplsTE))
  69                 return 0;
  70
  71         zebra_router_id_update_read(zclient->ibuf, &router_id);
  72         if (isis->router_id == router_id.u.prefix4.s_addr)
  73                 return 0;
  74
  75         isis->router_id = router_id.u.prefix4.s_addr;
  76         for (ALL_LIST_ELEMENTS_RO(isis->area_list, node, area))
  77                 if (listcount(area->area_addrs) > 0)
  78                         lsp_regenerate_schedule(area, area->is_type, 0);
  79
  80         return 0;
  81 }
  82
  83 static int isis_zebra_if_add(int command, struct zclient *zclient,
  84                              zebra_size_t length, vrf_id_t vrf_id)
  85 {
  86         struct interface *ifp;
  87
  88         ifp = zebra_interface_add_read(zclient->ibuf, vrf_id);
  89
  90         if (isis->debugs & DEBUG_ZEBRA)
  91                 zlog_debug(
  92                         "Zebra I/F add: %s index %d flags %ld metric %d mtu %d",
  93                         ifp->name, ifp->ifindex, (long)ifp->flags, ifp->metric,
  94                         ifp->mtu);
  95
  96         if (if_is_operative(ifp))
  97                 isis_csm_state_change(IF_UP_FROM_Z, circuit_scan_by_ifp(ifp),
  98                                       ifp);
  99
 100         return 0;
 101 }
 102
 103 static int isis_zebra_if_del(int command, struct zclient *zclient,
 104                              zebra_size_t length, vrf_id_t vrf_id)
 105 {
 106         struct interface *ifp;
 107         struct stream *s;
 108
 109         s = zclient->ibuf;
 110         ifp = zebra_interface_state_read(s, vrf_id);
 111
 112         if (!ifp)
 113                 return 0;
 114
 115         if (if_is_operative(ifp))
 116                 zlog_warn("Zebra: got delete of %s, but interface is still up",
 117                           ifp->name);
 118
 119         if (isis->debugs & DEBUG_ZEBRA)
 120                 zlog_debug(
 121                         "Zebra I/F delete: %s index %d flags %ld metric %d mtu %d",
 122                         ifp->name, ifp->ifindex, (long)ifp->flags, ifp->metric,
 123                         ifp->mtu);
 124
 125         isis_csm_state_change(IF_DOWN_FROM_Z, circuit_scan_by_ifp(ifp), ifp);
 126
 127         /* Cannot call if_delete because we should retain the pseudo interface
 128            in case there is configuration info attached to it. */
 129         if_delete_retain(ifp);
 130
 131         if_set_index(ifp, IFINDEX_INTERNAL);
 132
 133         return 0;
 134 }
 135
 136 static int isis_zebra_if_state_up(int command, struct zclient *zclient,
 137                                   zebra_size_t length, vrf_id_t vrf_id)
 138 {
 139         struct interface *ifp;
 140
 141         ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
 142
 143         if (ifp == NULL)
 144                 return 0;
 145
 146         isis_csm_state_change(IF_UP_FROM_Z, circuit_scan_by_ifp(ifp), ifp);
 147
 148         return 0;
 149 }
 150
 151 static int isis_zebra_if_state_down(int command, struct zclient *zclient,
 152                                     zebra_size_t length, vrf_id_t vrf_id)
 153 {
 154         struct interface *ifp;
 155         struct isis_circuit *circuit;
 156
 157         ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
 158
 159         if (ifp == NULL)
 160                 return 0;
 161
 162         circuit = isis_csm_state_change(IF_DOWN_FROM_Z,
 163                                         circuit_scan_by_ifp(ifp), ifp);
 164         if (circuit)
 165                 SET_FLAG(circuit->flags, ISIS_CIRCUIT_FLAPPED_AFTER_SPF);
 166
 167         return 0;
 168 }
 169
 170 static int isis_zebra_if_address_add(int command, struct zclient *zclient,
 171                                      zebra_size_t length, vrf_id_t vrf_id)
 172 {
 173         struct connected *c;
 174         struct prefix *p;
 175         char buf[PREFIX2STR_BUFFER];
 176
 177         c = zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_ADD,
 178                                          zclient->ibuf, vrf_id);
 179
 180         if (c == NULL)
 181                 return 0;
 182
 183         p = c->address;
 184
 185         prefix2str(p, buf, sizeof(buf));
 186 #ifdef EXTREME_DEBUG
 187         if (p->family == AF_INET)
 188                 zlog_debug("connected IP address %s", buf);
 189         if (p->family == AF_INET6)
 190                 zlog_debug("connected IPv6 address %s", buf);
 191 #endif /* EXTREME_DEBUG */
 192         if (if_is_operative(c->ifp))
 193                 isis_circuit_add_addr(circuit_scan_by_ifp(c->ifp), c);
 194
 195         return 0;
 196 }
 197
 198 static int isis_zebra_if_address_del(int command, struct zclient *client,
 199                                      zebra_size_t length, vrf_id_t vrf_id)
 200 {
 201         struct connected *c;
 202         struct interface *ifp;
 203 #ifdef EXTREME_DEBUG
 204         struct prefix *p;
 205         char buf[PREFIX2STR_BUFFER];
 206 #endif /* EXTREME_DEBUG */
 207
 208         c = zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_DELETE,
 209                                          zclient->ibuf, vrf_id);
 210
 211         if (c == NULL)
 212                 return 0;
 213
 214         ifp = c->ifp;
 215
 216 #ifdef EXTREME_DEBUG
 217         p = c->address;
 218         prefix2str(p, buf, sizeof(buf));
 219
 220         if (p->family == AF_INET)
 221                 zlog_debug("disconnected IP address %s", buf);
 222         if (p->family == AF_INET6)
 223                 zlog_debug("disconnected IPv6 address %s", buf);
 224 #endif /* EXTREME_DEBUG */
 225
 226         if (if_is_operative(ifp))
 227                 isis_circuit_del_addr(circuit_scan_by_ifp(ifp), c);
 228         connected_free(c);
 229
 230         return 0;
 231 }
 232
 233 static int isis_zebra_link_params(int command, struct zclient *zclient,
 234                                   zebra_size_t length)
 235 {
 236         struct interface *ifp;
 237
 238         ifp = zebra_interface_link_params_read(zclient->ibuf);
 239
 240         if (ifp == NULL)
 241                 return 0;
 242
 243         /* Update TE TLV */
 244         isis_mpls_te_update(ifp);
 245
 246         return 0;
 247 }
 248
 249 static void isis_zebra_route_add_route(struct prefix *prefix,
 250                                        struct isis_route_info *route_info)
 251 {
 252         struct zapi_route api;
 253         struct zapi_nexthop *api_nh;
 254         struct isis_nexthop *nexthop;
 255         struct isis_nexthop6 *nexthop6;
 256         struct listnode *node;
 257         int count = 0;
 258
 259         if (CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED))
 260                 return;
 261
 262         memset(&api, 0, sizeof(api));
 263         api.vrf_id = VRF_DEFAULT;
 264         api.type = ZEBRA_ROUTE_ISIS;
 265         api.safi = SAFI_UNICAST;
 266         api.prefix = *prefix;
 267         SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
 268         SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
 269         api.metric = route_info->cost;
 270 #if 0
 271         SET_FLAG(api.message, ZAPI_MESSAGE_DISTANCE);
 272         api.distance = route_info->depth;
 273 #endif
 274
 275         /* Nexthops */
 276         switch (prefix->family) {
 277         case AF_INET:
 278                 for (ALL_LIST_ELEMENTS_RO(route_info->nexthops, node,
 279                                           nexthop)) {
 280                         if (count >= MULTIPATH_NUM)
 281                                 break;
 282                         api_nh = &api.nexthops[count];
 283                         /* FIXME: can it be ? */
 284                         if (nexthop->ip.s_addr != INADDR_ANY) {
 285                                 api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
 286                                 api_nh->gate.ipv4 = nexthop->ip;
 287                         } else {
 288                                 api_nh->type = NEXTHOP_TYPE_IFINDEX;
 289                         }
 290                         api_nh->ifindex = nexthop->ifindex;
 291                         count++;
 292                 }
 293                 break;
 294         case AF_INET6:
 295                 for (ALL_LIST_ELEMENTS_RO(route_info->nexthops6, node,
 296                                           nexthop6)) {
 297                         if (count >= MULTIPATH_NUM)
 298                                 break;
 299                         if (!IN6_IS_ADDR_LINKLOCAL(&nexthop6->ip6)
 300                             && !IN6_IS_ADDR_UNSPECIFIED(&nexthop6->ip6)) {
 301                                 continue;
 302                         }
 303
 304                         api_nh = &api.nexthops[count];
 305                         api_nh->gate.ipv6 = nexthop6->ip6;
 306                         api_nh->ifindex = nexthop6->ifindex;
 307                         api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX;
 308                         count++;
 309                 }
 310                 break;
 311         }
 312         if (!count)
 313                 return;
 314
 315         api.nexthop_num = count;
 316
 317         zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api);
 318         SET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
 319         UNSET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_RESYNC);
 320 }
 321
 322 static void isis_zebra_route_del_route(struct prefix *prefix,
 323                                        struct isis_route_info *route_info)
 324 {
 325         struct zapi_route api;
 326
 327         if (!CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED))
 328                 return;
 329
 330         memset(&api, 0, sizeof(api));
 331         api.vrf_id = VRF_DEFAULT;
 332         api.type = ZEBRA_ROUTE_ISIS;
 333         api.safi = SAFI_UNICAST;
 334         api.prefix = *prefix;
 335
 336         zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
 337         UNSET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
 338 }
 339
 340 void isis_zebra_route_update(struct prefix *prefix,
 341                              struct isis_route_info *route_info)
 342 {
 343         if (zclient->sock < 0)
 344                 return;
 345
 346         if (CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ACTIVE))
 347                 isis_zebra_route_add_route(prefix, route_info);
 348         else
 349                 isis_zebra_route_del_route(prefix, route_info);
 350 }
 351
 352 static int isis_zebra_read(int command, struct zclient *zclient,
 353                            zebra_size_t length, vrf_id_t vrf_id)
 354 {
 355         struct zapi_route api;
 356
 357         if (zapi_route_decode(zclient->ibuf, &api) < 0)
 358                 return -1;
 359
 360         /* we completely ignore srcdest routes for now. */
 361         if (CHECK_FLAG(api.message, ZAPI_MESSAGE_SRCPFX))
 362                 return 0;
 363
 364         /*
 365          * Avoid advertising a false default reachability. (A default
 366          * route installed by IS-IS gets redistributed from zebra back
 367          * into IS-IS causing us to start advertising default reachabity
 368          * without this check)
 369          */
 370         if (api.prefix.prefixlen == 0 && api.type == ZEBRA_ROUTE_ISIS)
 371                 command = ZEBRA_REDISTRIBUTE_ROUTE_DEL;
 372
 373         if (command == ZEBRA_REDISTRIBUTE_ROUTE_ADD)
 374                 isis_redist_add(api.type, &api.prefix, api.distance,
 375                                 api.metric);
 376         else
 377                 isis_redist_delete(api.type, &api.prefix);
 378
 379         return 0;
 380 }
 381
 382 int isis_distribute_list_update(int routetype)
 383 {
 384         return 0;
 385 }
 386
 387 void isis_zebra_redistribute_set(afi_t afi, int type)
 388 {
 389         if (type == DEFAULT_ROUTE)
 390                 zclient_redistribute_default(ZEBRA_REDISTRIBUTE_DEFAULT_ADD,
 391                                              zclient, VRF_DEFAULT);
 392         else
 393                 zclient_redistribute(ZEBRA_REDISTRIBUTE_ADD, zclient, afi, type,
 394                                      0, VRF_DEFAULT);
 395 }
 396
 397 void isis_zebra_redistribute_unset(afi_t afi, int type)
 398 {
 399         if (type == DEFAULT_ROUTE)
 400                 zclient_redistribute_default(ZEBRA_REDISTRIBUTE_DEFAULT_DELETE,
 401                                              zclient, VRF_DEFAULT);
 402         else
 403                 zclient_redistribute(ZEBRA_REDISTRIBUTE_DELETE, zclient, afi,
 404                                      type, 0, VRF_DEFAULT);
 405 }
 406
 407 static void isis_zebra_connected(struct zclient *zclient)
 408 {
 409         zclient_send_reg_requests(zclient, VRF_DEFAULT);
 410 }
 411
 412 void isis_zebra_init(struct thread_master *master)
 413 {
 414         zclient = zclient_new(master);
 415         zclient_init(zclient, ZEBRA_ROUTE_ISIS, 0);
 416         zclient->zebra_connected = isis_zebra_connected;
 417         zclient->router_id_update = isis_router_id_update_zebra;
 418         zclient->interface_add = isis_zebra_if_add;
 419         zclient->interface_delete = isis_zebra_if_del;
 420         zclient->interface_up = isis_zebra_if_state_up;
 421         zclient->interface_down = isis_zebra_if_state_down;
 422         zclient->interface_address_add = isis_zebra_if_address_add;
 423         zclient->interface_address_delete = isis_zebra_if_address_del;
 424         zclient->interface_link_params = isis_zebra_link_params;
 425         zclient->redistribute_route_add = isis_zebra_read;
 426         zclient->redistribute_route_del = isis_zebra_read;
 427
 428         return;
 429 }
 430
 431 void isis_zebra_stop(void)
 432 {
 433         zclient_stop(zclient);
 434         zclient_free(zclient);
 435         frr_fini();
 436 }