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 (if_is_operative(ifp))
  91                 isis_csm_state_change(IF_UP_FROM_Z, circuit_scan_by_ifp(ifp),
  92                                       ifp);
  93
  94         return 0;
  95 }
  96
  97 static int isis_zebra_if_del(int command, struct zclient *zclient,
  98                              zebra_size_t length, vrf_id_t vrf_id)
  99 {
 100         struct interface *ifp;
 101         struct stream *s;
 102
 103         s = zclient->ibuf;
 104         ifp = zebra_interface_state_read(s, vrf_id);
 105
 106         if (!ifp)
 107                 return 0;
 108
 109         if (if_is_operative(ifp))
 110                 zlog_warn("Zebra: got delete of %s, but interface is still up",
 111                           ifp->name);
 112
 113         isis_csm_state_change(IF_DOWN_FROM_Z, circuit_scan_by_ifp(ifp), ifp);
 114
 115         /* Cannot call if_delete because we should retain the pseudo interface
 116            in case there is configuration info attached to it. */
 117         if_delete_retain(ifp);
 118
 119         if_set_index(ifp, IFINDEX_INTERNAL);
 120
 121         return 0;
 122 }
 123
 124 static int isis_zebra_if_state_up(int command, struct zclient *zclient,
 125                                   zebra_size_t length, vrf_id_t vrf_id)
 126 {
 127         struct interface *ifp;
 128
 129         ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
 130
 131         if (ifp == NULL)
 132                 return 0;
 133
 134         isis_csm_state_change(IF_UP_FROM_Z, circuit_scan_by_ifp(ifp), ifp);
 135
 136         return 0;
 137 }
 138
 139 static int isis_zebra_if_state_down(int command, struct zclient *zclient,
 140                                     zebra_size_t length, vrf_id_t vrf_id)
 141 {
 142         struct interface *ifp;
 143         struct isis_circuit *circuit;
 144
 145         ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
 146
 147         if (ifp == NULL)
 148                 return 0;
 149
 150         circuit = isis_csm_state_change(IF_DOWN_FROM_Z,
 151                                         circuit_scan_by_ifp(ifp), ifp);
 152         if (circuit)
 153                 SET_FLAG(circuit->flags, ISIS_CIRCUIT_FLAPPED_AFTER_SPF);
 154
 155         return 0;
 156 }
 157
 158 static int isis_zebra_if_address_add(int command, struct zclient *zclient,
 159                                      zebra_size_t length, vrf_id_t vrf_id)
 160 {
 161         struct connected *c;
 162         struct prefix *p;
 163         char buf[PREFIX2STR_BUFFER];
 164
 165         c = zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_ADD,
 166                                          zclient->ibuf, vrf_id);
 167
 168         if (c == NULL)
 169                 return 0;
 170
 171         p = c->address;
 172
 173         prefix2str(p, buf, sizeof(buf));
 174 #ifdef EXTREME_DEBUG
 175         if (p->family == AF_INET)
 176                 zlog_debug("connected IP address %s", buf);
 177         if (p->family == AF_INET6)
 178                 zlog_debug("connected IPv6 address %s", buf);
 179 #endif /* EXTREME_DEBUG */
 180         if (if_is_operative(c->ifp))
 181                 isis_circuit_add_addr(circuit_scan_by_ifp(c->ifp), c);
 182
 183         return 0;
 184 }
 185
 186 static int isis_zebra_if_address_del(int command, struct zclient *client,
 187                                      zebra_size_t length, vrf_id_t vrf_id)
 188 {
 189         struct connected *c;
 190         struct interface *ifp;
 191 #ifdef EXTREME_DEBUG
 192         struct prefix *p;
 193         char buf[PREFIX2STR_BUFFER];
 194 #endif /* EXTREME_DEBUG */
 195
 196         c = zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_DELETE,
 197                                          zclient->ibuf, vrf_id);
 198
 199         if (c == NULL)
 200                 return 0;
 201
 202         ifp = c->ifp;
 203
 204 #ifdef EXTREME_DEBUG
 205         p = c->address;
 206         prefix2str(p, buf, sizeof(buf));
 207
 208         if (p->family == AF_INET)
 209                 zlog_debug("disconnected IP address %s", buf);
 210         if (p->family == AF_INET6)
 211                 zlog_debug("disconnected IPv6 address %s", buf);
 212 #endif /* EXTREME_DEBUG */
 213
 214         if (if_is_operative(ifp))
 215                 isis_circuit_del_addr(circuit_scan_by_ifp(ifp), c);
 216         connected_free(c);
 217
 218         return 0;
 219 }
 220
 221 static int isis_zebra_link_params(int command, struct zclient *zclient,
 222                                   zebra_size_t length)
 223 {
 224         struct interface *ifp;
 225
 226         ifp = zebra_interface_link_params_read(zclient->ibuf);
 227
 228         if (ifp == NULL)
 229                 return 0;
 230
 231         /* Update TE TLV */
 232         isis_mpls_te_update(ifp);
 233
 234         return 0;
 235 }
 236
 237 static void isis_zebra_route_add_route(struct prefix *prefix,
 238                                        struct prefix_ipv6 *src_p,
 239                                        struct isis_route_info *route_info)
 240 {
 241         struct zapi_route api;
 242         struct zapi_nexthop *api_nh;
 243         struct isis_nexthop *nexthop;
 244         struct isis_nexthop6 *nexthop6;
 245         struct listnode *node;
 246         int count = 0;
 247
 248         if (CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED))
 249                 return;
 250
 251         memset(&api, 0, sizeof(api));
 252         if (fabricd)
 253                 api.flags |= ZEBRA_FLAG_ONLINK;
 254         api.vrf_id = VRF_DEFAULT;
 255         api.type = PROTO_TYPE;
 256         api.safi = SAFI_UNICAST;
 257         api.prefix = *prefix;
 258         if (src_p && src_p->prefixlen) {
 259                 api.src_prefix = *src_p;
 260                 SET_FLAG(api.message, ZAPI_MESSAGE_SRCPFX);
 261         }
 262         SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
 263         SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
 264         api.metric = route_info->cost;
 265 #if 0
 266         SET_FLAG(api.message, ZAPI_MESSAGE_DISTANCE);
 267         api.distance = route_info->depth;
 268 #endif
 269
 270         /* Nexthops */
 271         switch (prefix->family) {
 272         case AF_INET:
 273                 for (ALL_LIST_ELEMENTS_RO(route_info->nexthops, node,
 274                                           nexthop)) {
 275                         if (count >= MULTIPATH_NUM)
 276                                 break;
 277                         api_nh = &api.nexthops[count];
 278                         api_nh->vrf_id = VRF_DEFAULT;
 279                         /* FIXME: can it be ? */
 280                         if (nexthop->ip.s_addr != INADDR_ANY) {
 281                                 api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
 282                                 api_nh->gate.ipv4 = nexthop->ip;
 283                         } else {
 284                                 api_nh->type = NEXTHOP_TYPE_IFINDEX;
 285                         }
 286                         api_nh->ifindex = nexthop->ifindex;
 287                         count++;
 288                 }
 289                 break;
 290         case AF_INET6:
 291                 for (ALL_LIST_ELEMENTS_RO(route_info->nexthops6, node,
 292                                           nexthop6)) {
 293                         if (count >= MULTIPATH_NUM)
 294                                 break;
 295                         if (!IN6_IS_ADDR_LINKLOCAL(&nexthop6->ip6)
 296                             && !IN6_IS_ADDR_UNSPECIFIED(&nexthop6->ip6)) {
 297                                 continue;
 298                         }
 299
 300                         api_nh = &api.nexthops[count];
 301                         api_nh->vrf_id = VRF_DEFAULT;
 302                         api_nh->gate.ipv6 = nexthop6->ip6;
 303                         api_nh->ifindex = nexthop6->ifindex;
 304                         api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX;
 305                         count++;
 306                 }
 307                 break;
 308         }
 309         if (!count)
 310                 return;
 311
 312         api.nexthop_num = count;
 313
 314         zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api);
 315         SET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
 316         UNSET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_RESYNC);
 317 }
 318
 319 static void isis_zebra_route_del_route(struct prefix *prefix,
 320                                        struct prefix_ipv6 *src_p,
 321                                        struct isis_route_info *route_info)
 322 {
 323         struct zapi_route api;
 324
 325         if (!CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED))
 326                 return;
 327
 328         memset(&api, 0, sizeof(api));
 329         api.vrf_id = VRF_DEFAULT;
 330         api.type = PROTO_TYPE;
 331         api.safi = SAFI_UNICAST;
 332         api.prefix = *prefix;
 333         if (src_p && src_p->prefixlen) {
 334                 api.src_prefix = *src_p;
 335                 SET_FLAG(api.message, ZAPI_MESSAGE_SRCPFX);
 336         }
 337
 338         zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
 339         UNSET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
 340 }
 341
 342 void isis_zebra_route_update(struct prefix *prefix,
 343                              struct prefix_ipv6 *src_p,
 344                              struct isis_route_info *route_info)
 345 {
 346         if (zclient->sock < 0)
 347                 return;
 348
 349         if (CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ACTIVE))
 350                 isis_zebra_route_add_route(prefix, src_p, route_info);
 351         else
 352                 isis_zebra_route_del_route(prefix, src_p, route_info);
 353 }
 354
 355 static int isis_zebra_read(int command, struct zclient *zclient,
 356                            zebra_size_t length, vrf_id_t vrf_id)
 357 {
 358         struct zapi_route api;
 359
 360         if (zapi_route_decode(zclient->ibuf, &api) < 0)
 361                 return -1;
 362
 363         /*
 364          * Avoid advertising a false default reachability. (A default
 365          * route installed by IS-IS gets redistributed from zebra back
 366          * into IS-IS causing us to start advertising default reachabity
 367          * without this check)
 368          */
 369         if (api.prefix.prefixlen == 0
 370             && api.src_prefix.prefixlen == 0
 371             && api.type == PROTO_TYPE) {
 372                 command = ZEBRA_REDISTRIBUTE_ROUTE_DEL;
 373         }
 374
 375         if (command == ZEBRA_REDISTRIBUTE_ROUTE_ADD)
 376                 isis_redist_add(api.type, &api.prefix, &api.src_prefix,
 377                                 api.distance, api.metric);
 378         else
 379                 isis_redist_delete(api.type, &api.prefix, &api.src_prefix);
 380
 381         return 0;
 382 }
 383
 384 int isis_distribute_list_update(int routetype)
 385 {
 386         return 0;
 387 }
 388
 389 void isis_zebra_redistribute_set(afi_t afi, int type)
 390 {
 391         if (type == DEFAULT_ROUTE)
 392                 zclient_redistribute_default(ZEBRA_REDISTRIBUTE_DEFAULT_ADD,
 393                                              zclient, VRF_DEFAULT);
 394         else
 395                 zclient_redistribute(ZEBRA_REDISTRIBUTE_ADD, zclient, afi, type,
 396                                      0, VRF_DEFAULT);
 397 }
 398
 399 void isis_zebra_redistribute_unset(afi_t afi, int type)
 400 {
 401         if (type == DEFAULT_ROUTE)
 402                 zclient_redistribute_default(ZEBRA_REDISTRIBUTE_DEFAULT_DELETE,
 403                                              zclient, VRF_DEFAULT);
 404         else
 405                 zclient_redistribute(ZEBRA_REDISTRIBUTE_DELETE, zclient, afi,
 406                                      type, 0, VRF_DEFAULT);
 407 }
 408
 409 static void isis_zebra_connected(struct zclient *zclient)
 410 {
 411         zclient_send_reg_requests(zclient, VRF_DEFAULT);
 412 }
 413
 414 void isis_zebra_init(struct thread_master *master)
 415 {
 416         zclient = zclient_new(master, &zclient_options_default);
 417         zclient_init(zclient, PROTO_TYPE, 0, &isisd_privs);
 418         zclient->zebra_connected = isis_zebra_connected;
 419         zclient->router_id_update = isis_router_id_update_zebra;
 420         zclient->interface_add = isis_zebra_if_add;
 421         zclient->interface_delete = isis_zebra_if_del;
 422         zclient->interface_up = isis_zebra_if_state_up;
 423         zclient->interface_down = isis_zebra_if_state_down;
 424         zclient->interface_address_add = isis_zebra_if_address_add;
 425         zclient->interface_address_delete = isis_zebra_if_address_del;
 426         zclient->interface_link_params = isis_zebra_link_params;
 427         zclient->redistribute_route_add = isis_zebra_read;
 428         zclient->redistribute_route_del = isis_zebra_read;
 429
 430         return;
 431 }
 432
 433 void isis_zebra_stop(void)
 434 {
 435         zclient_stop(zclient);
 436         zclient_free(zclient);
 437         frr_fini();
 438 }