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 prefix_ipv6 *src_p,
 251                                        struct isis_route_info *route_info)
 252 {
 253         struct zapi_route api;
 254         struct zapi_nexthop *api_nh;
 255         struct isis_nexthop *nexthop;
 256         struct isis_nexthop6 *nexthop6;
 257         struct listnode *node;
 258         int count = 0;
 259
 260         if (CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED))
 261                 return;
 262
 263         memset(&api, 0, sizeof(api));
 264         api.vrf_id = VRF_DEFAULT;
 265         api.type = ZEBRA_ROUTE_ISIS;
 266         api.safi = SAFI_UNICAST;
 267         api.prefix = *prefix;
 268         if (src_p && src_p->prefixlen) {
 269                 api.src_prefix = *src_p;
 270                 SET_FLAG(api.message, ZAPI_MESSAGE_SRCPFX);
 271         }
 272         SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
 273         SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
 274         api.metric = route_info->cost;
 275 #if 0
 276         SET_FLAG(api.message, ZAPI_MESSAGE_DISTANCE);
 277         api.distance = route_info->depth;
 278 #endif
 279
 280         /* Nexthops */
 281         switch (prefix->family) {
 282         case AF_INET:
 283                 for (ALL_LIST_ELEMENTS_RO(route_info->nexthops, node,
 284                                           nexthop)) {
 285                         if (count >= MULTIPATH_NUM)
 286                                 break;
 287                         api_nh = &api.nexthops[count];
 288                         api_nh->vrf_id = VRF_DEFAULT;
 289                         /* FIXME: can it be ? */
 290                         if (nexthop->ip.s_addr != INADDR_ANY) {
 291                                 api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
 292                                 api_nh->gate.ipv4 = nexthop->ip;
 293                         } else {
 294                                 api_nh->type = NEXTHOP_TYPE_IFINDEX;
 295                         }
 296                         api_nh->ifindex = nexthop->ifindex;
 297                         count++;
 298                 }
 299                 break;
 300         case AF_INET6:
 301                 for (ALL_LIST_ELEMENTS_RO(route_info->nexthops6, node,
 302                                           nexthop6)) {
 303                         if (count >= MULTIPATH_NUM)
 304                                 break;
 305                         if (!IN6_IS_ADDR_LINKLOCAL(&nexthop6->ip6)
 306                             && !IN6_IS_ADDR_UNSPECIFIED(&nexthop6->ip6)) {
 307                                 continue;
 308                         }
 309
 310                         api_nh = &api.nexthops[count];
 311                         api_nh->vrf_id = VRF_DEFAULT;
 312                         api_nh->gate.ipv6 = nexthop6->ip6;
 313                         api_nh->ifindex = nexthop6->ifindex;
 314                         api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX;
 315                         count++;
 316                 }
 317                 break;
 318         }
 319         if (!count)
 320                 return;
 321
 322         api.nexthop_num = count;
 323
 324         zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api);
 325         SET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
 326         UNSET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_RESYNC);
 327 }
 328
 329 static void isis_zebra_route_del_route(struct prefix *prefix,
 330                                        struct prefix_ipv6 *src_p,
 331                                        struct isis_route_info *route_info)
 332 {
 333         struct zapi_route api;
 334
 335         if (!CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED))
 336                 return;
 337
 338         memset(&api, 0, sizeof(api));
 339         api.vrf_id = VRF_DEFAULT;
 340         api.type = ZEBRA_ROUTE_ISIS;
 341         api.safi = SAFI_UNICAST;
 342         api.prefix = *prefix;
 343         if (src_p && src_p->prefixlen) {
 344                 api.src_prefix = *src_p;
 345                 SET_FLAG(api.message, ZAPI_MESSAGE_SRCPFX);
 346         }
 347
 348         zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
 349         UNSET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
 350 }
 351
 352 void isis_zebra_route_update(struct prefix *prefix,
 353                              struct prefix_ipv6 *src_p,
 354                              struct isis_route_info *route_info)
 355 {
 356         if (zclient->sock < 0)
 357                 return;
 358
 359         if (CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ACTIVE))
 360                 isis_zebra_route_add_route(prefix, src_p, route_info);
 361         else
 362                 isis_zebra_route_del_route(prefix, src_p, route_info);
 363 }
 364
 365 static int isis_zebra_read(int command, struct zclient *zclient,
 366                            zebra_size_t length, vrf_id_t vrf_id)
 367 {
 368         struct zapi_route api;
 369
 370         if (zapi_route_decode(zclient->ibuf, &api) < 0)
 371                 return -1;
 372
 373         /*
 374          * Avoid advertising a false default reachability. (A default
 375          * route installed by IS-IS gets redistributed from zebra back
 376          * into IS-IS causing us to start advertising default reachabity
 377          * without this check)
 378          */
 379         if (api.prefix.prefixlen == 0
 380             && api.src_prefix.prefixlen == 0
 381             && api.type == ZEBRA_ROUTE_ISIS) {
 382                 command = ZEBRA_REDISTRIBUTE_ROUTE_DEL;
 383         }
 384
 385         if (command == ZEBRA_REDISTRIBUTE_ROUTE_ADD)
 386                 isis_redist_add(api.type, &api.prefix, &api.src_prefix,
 387                                 api.distance, api.metric);
 388         else
 389                 isis_redist_delete(api.type, &api.prefix, &api.src_prefix);
 390
 391         return 0;
 392 }
 393
 394 int isis_distribute_list_update(int routetype)
 395 {
 396         return 0;
 397 }
 398
 399 void isis_zebra_redistribute_set(afi_t afi, int type)
 400 {
 401         if (type == DEFAULT_ROUTE)
 402                 zclient_redistribute_default(ZEBRA_REDISTRIBUTE_DEFAULT_ADD,
 403                                              zclient, VRF_DEFAULT);
 404         else
 405                 zclient_redistribute(ZEBRA_REDISTRIBUTE_ADD, zclient, afi, type,
 406                                      0, VRF_DEFAULT);
 407 }
 408
 409 void isis_zebra_redistribute_unset(afi_t afi, int type)
 410 {
 411         if (type == DEFAULT_ROUTE)
 412                 zclient_redistribute_default(ZEBRA_REDISTRIBUTE_DEFAULT_DELETE,
 413                                              zclient, VRF_DEFAULT);
 414         else
 415                 zclient_redistribute(ZEBRA_REDISTRIBUTE_DELETE, zclient, afi,
 416                                      type, 0, VRF_DEFAULT);
 417 }
 418
 419 static void isis_zebra_connected(struct zclient *zclient)
 420 {
 421         zclient_send_reg_requests(zclient, VRF_DEFAULT);
 422 }
 423
 424 void isis_zebra_init(struct thread_master *master)
 425 {
 426         zclient = zclient_new_notify(master, &zclient_options_default);
 427         zclient_init(zclient, ZEBRA_ROUTE_ISIS, 0, &isisd_privs);
 428         zclient->zebra_connected = isis_zebra_connected;
 429         zclient->router_id_update = isis_router_id_update_zebra;
 430         zclient->interface_add = isis_zebra_if_add;
 431         zclient->interface_delete = isis_zebra_if_del;
 432         zclient->interface_up = isis_zebra_if_state_up;
 433         zclient->interface_down = isis_zebra_if_state_down;
 434         zclient->interface_address_add = isis_zebra_if_address_add;
 435         zclient->interface_address_delete = isis_zebra_if_address_del;
 436         zclient->interface_link_params = isis_zebra_link_params;
 437         zclient->redistribute_route_add = isis_zebra_read;
 438         zclient->redistribute_route_del = isis_zebra_read;
 439
 440         return;
 441 }
 442
 443 void isis_zebra_stop(void)
 444 {
 445         zclient_stop(zclient);
 446         zclient_free(zclient);
 447         frr_fini();
 448 }