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 "lib_errors.h"
  31 #include "if.h"
  32 #include "network.h"
  33 #include "prefix.h"
  34 #include "zclient.h"
  35 #include "stream.h"
  36 #include "linklist.h"
  37 #include "nexthop.h"
  38 #include "vrf.h"
  39 #include "libfrr.h"
  40
  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(ZAPI_CALLBACK_ARGS)
  58 {
  59         struct isis_area *area;
  60         struct listnode *node;
  61         struct prefix router_id;
  62
  63         zebra_router_id_update_read(zclient->ibuf, &router_id);
  64         if (isis->router_id == router_id.u.prefix4.s_addr)
  65                 return 0;
  66
  67         isis->router_id = router_id.u.prefix4.s_addr;
  68         for (ALL_LIST_ELEMENTS_RO(isis->area_list, node, area))
  69                 if (listcount(area->area_addrs) > 0)
  70                         lsp_regenerate_schedule(area, area->is_type, 0);
  71
  72         return 0;
  73 }
  74
  75 static int isis_zebra_if_add(ZAPI_CALLBACK_ARGS)
  76 {
  77         struct interface *ifp;
  78
  79         ifp = zebra_interface_add_read(zclient->ibuf, vrf_id);
  80
  81         if (if_is_operative(ifp))
  82                 isis_csm_state_change(IF_UP_FROM_Z, circuit_scan_by_ifp(ifp),
  83                                       ifp);
  84
  85         return 0;
  86 }
  87
  88 static int isis_zebra_if_del(ZAPI_CALLBACK_ARGS)
  89 {
  90         struct interface *ifp;
  91         struct stream *s;
  92
  93         s = zclient->ibuf;
  94         ifp = zebra_interface_state_read(s, vrf_id);
  95
  96         if (!ifp)
  97                 return 0;
  98
  99         if (if_is_operative(ifp))
 100                 zlog_warn("Zebra: got delete of %s, but interface is still up",
 101                           ifp->name);
 102
 103         isis_csm_state_change(IF_DOWN_FROM_Z, circuit_scan_by_ifp(ifp), ifp);
 104
 105         /* Cannot call if_delete because we should retain the pseudo interface
 106            in case there is configuration info attached to it. */
 107         if_delete_retain(ifp);
 108
 109         if_set_index(ifp, IFINDEX_INTERNAL);
 110
 111         return 0;
 112 }
 113
 114 static int isis_zebra_if_state_up(ZAPI_CALLBACK_ARGS)
 115 {
 116         struct interface *ifp;
 117
 118         ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
 119
 120         if (ifp == NULL)
 121                 return 0;
 122
 123         isis_csm_state_change(IF_UP_FROM_Z, circuit_scan_by_ifp(ifp), ifp);
 124
 125         return 0;
 126 }
 127
 128 static int isis_zebra_if_state_down(ZAPI_CALLBACK_ARGS)
 129 {
 130         struct interface *ifp;
 131         struct isis_circuit *circuit;
 132
 133         ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
 134
 135         if (ifp == NULL)
 136                 return 0;
 137
 138         circuit = isis_csm_state_change(IF_DOWN_FROM_Z,
 139                                         circuit_scan_by_ifp(ifp), ifp);
 140         if (circuit)
 141                 SET_FLAG(circuit->flags, ISIS_CIRCUIT_FLAPPED_AFTER_SPF);
 142
 143         return 0;
 144 }
 145
 146 static int isis_zebra_if_address_add(ZAPI_CALLBACK_ARGS)
 147 {
 148         struct connected *c;
 149         struct prefix *p;
 150         char buf[PREFIX2STR_BUFFER];
 151
 152         c = zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_ADD,
 153                                          zclient->ibuf, vrf_id);
 154
 155         if (c == NULL)
 156                 return 0;
 157
 158         p = c->address;
 159
 160         prefix2str(p, buf, sizeof(buf));
 161 #ifdef EXTREME_DEBUG
 162         if (p->family == AF_INET)
 163                 zlog_debug("connected IP address %s", buf);
 164         if (p->family == AF_INET6)
 165                 zlog_debug("connected IPv6 address %s", buf);
 166 #endif /* EXTREME_DEBUG */
 167         if (if_is_operative(c->ifp))
 168                 isis_circuit_add_addr(circuit_scan_by_ifp(c->ifp), c);
 169
 170         return 0;
 171 }
 172
 173 static int isis_zebra_if_address_del(ZAPI_CALLBACK_ARGS)
 174 {
 175         struct connected *c;
 176         struct interface *ifp;
 177 #ifdef EXTREME_DEBUG
 178         struct prefix *p;
 179         char buf[PREFIX2STR_BUFFER];
 180 #endif /* EXTREME_DEBUG */
 181
 182         c = zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_DELETE,
 183                                          zclient->ibuf, vrf_id);
 184
 185         if (c == NULL)
 186                 return 0;
 187
 188         ifp = c->ifp;
 189
 190 #ifdef EXTREME_DEBUG
 191         p = c->address;
 192         prefix2str(p, buf, sizeof(buf));
 193
 194         if (p->family == AF_INET)
 195                 zlog_debug("disconnected IP address %s", buf);
 196         if (p->family == AF_INET6)
 197                 zlog_debug("disconnected IPv6 address %s", buf);
 198 #endif /* EXTREME_DEBUG */
 199
 200         if (if_is_operative(ifp))
 201                 isis_circuit_del_addr(circuit_scan_by_ifp(ifp), c);
 202         connected_free(c);
 203
 204         return 0;
 205 }
 206
 207 static int isis_zebra_link_params(ZAPI_CALLBACK_ARGS)
 208 {
 209         struct interface *ifp;
 210
 211         ifp = zebra_interface_link_params_read(zclient->ibuf, vrf_id);
 212
 213         if (ifp == NULL)
 214                 return 0;
 215
 216         /* Update TE TLV */
 217         isis_mpls_te_update(ifp);
 218
 219         return 0;
 220 }
 221
 222 static void isis_zebra_route_add_route(struct prefix *prefix,
 223                                        struct prefix_ipv6 *src_p,
 224                                        struct isis_route_info *route_info)
 225 {
 226         struct zapi_route api;
 227         struct zapi_nexthop *api_nh;
 228         struct isis_nexthop *nexthop;
 229         struct listnode *node;
 230         int count = 0;
 231
 232         if (CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED))
 233                 return;
 234
 235         memset(&api, 0, sizeof(api));
 236         api.vrf_id = VRF_DEFAULT;
 237         api.type = PROTO_TYPE;
 238         api.safi = SAFI_UNICAST;
 239         api.prefix = *prefix;
 240         if (src_p && src_p->prefixlen) {
 241                 api.src_prefix = *src_p;
 242                 SET_FLAG(api.message, ZAPI_MESSAGE_SRCPFX);
 243         }
 244         SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
 245         SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
 246         api.metric = route_info->cost;
 247 #if 0
 248         SET_FLAG(api.message, ZAPI_MESSAGE_DISTANCE);
 249         api.distance = route_info->depth;
 250 #endif
 251
 252         /* Nexthops */
 253         for (ALL_LIST_ELEMENTS_RO(route_info->nexthops, node, nexthop)) {
 254                 if (count >= MULTIPATH_NUM)
 255                         break;
 256                 api_nh = &api.nexthops[count];
 257                 if (fabricd)
 258                         api_nh->onlink = true;
 259                 api_nh->vrf_id = VRF_DEFAULT;
 260
 261                 switch (nexthop->family) {
 262                 case AF_INET:
 263                         /* FIXME: can it be ? */
 264                         if (nexthop->ip.ipv4.s_addr != INADDR_ANY) {
 265                                 api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
 266                                 api_nh->gate.ipv4 = nexthop->ip.ipv4;
 267                         } else {
 268                                 api_nh->type = NEXTHOP_TYPE_IFINDEX;
 269                         }
 270                         break;
 271                 case AF_INET6:
 272                         if (!IN6_IS_ADDR_LINKLOCAL(&nexthop->ip.ipv6)
 273                             && !IN6_IS_ADDR_UNSPECIFIED(&nexthop->ip.ipv6)) {
 274                                 continue;
 275                         }
 276                         api_nh->gate.ipv6 = nexthop->ip.ipv6;
 277                         api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX;
 278                         break;
 279                 default:
 280                         flog_err(EC_LIB_DEVELOPMENT,
 281                                  "%s: unknown address family [%d]", __func__,
 282                                  nexthop->family);
 283                         exit(1);
 284                 }
 285
 286                 api_nh->ifindex = nexthop->ifindex;
 287                 count++;
 288         }
 289         if (!count)
 290                 return;
 291
 292         api.nexthop_num = count;
 293
 294         zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api);
 295         SET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
 296         UNSET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_RESYNC);
 297 }
 298
 299 static void isis_zebra_route_del_route(struct prefix *prefix,
 300                                        struct prefix_ipv6 *src_p,
 301                                        struct isis_route_info *route_info)
 302 {
 303         struct zapi_route api;
 304
 305         if (!CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED))
 306                 return;
 307
 308         memset(&api, 0, sizeof(api));
 309         api.vrf_id = VRF_DEFAULT;
 310         api.type = PROTO_TYPE;
 311         api.safi = SAFI_UNICAST;
 312         api.prefix = *prefix;
 313         if (src_p && src_p->prefixlen) {
 314                 api.src_prefix = *src_p;
 315                 SET_FLAG(api.message, ZAPI_MESSAGE_SRCPFX);
 316         }
 317
 318         zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
 319         UNSET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
 320 }
 321
 322 void isis_zebra_route_update(struct prefix *prefix,
 323                              struct prefix_ipv6 *src_p,
 324                              struct isis_route_info *route_info)
 325 {
 326         if (zclient->sock < 0)
 327                 return;
 328
 329         if (CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ACTIVE))
 330                 isis_zebra_route_add_route(prefix, src_p, route_info);
 331         else
 332                 isis_zebra_route_del_route(prefix, src_p, route_info);
 333 }
 334
 335 static int isis_zebra_read(ZAPI_CALLBACK_ARGS)
 336 {
 337         struct zapi_route api;
 338
 339         if (zapi_route_decode(zclient->ibuf, &api) < 0)
 340                 return -1;
 341
 342         if (api.prefix.family == AF_INET6
 343             && IN6_IS_ADDR_LINKLOCAL(&api.prefix.u.prefix6))
 344                 return 0;
 345
 346         /*
 347          * Avoid advertising a false default reachability. (A default
 348          * route installed by IS-IS gets redistributed from zebra back
 349          * into IS-IS causing us to start advertising default reachabity
 350          * without this check)
 351          */
 352         if (api.prefix.prefixlen == 0
 353             && api.src_prefix.prefixlen == 0
 354             && api.type == PROTO_TYPE) {
 355                 cmd = ZEBRA_REDISTRIBUTE_ROUTE_DEL;
 356         }
 357
 358         if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD)
 359                 isis_redist_add(api.type, &api.prefix, &api.src_prefix,
 360                                 api.distance, api.metric);
 361         else
 362                 isis_redist_delete(api.type, &api.prefix, &api.src_prefix);
 363
 364         return 0;
 365 }
 366
 367 int isis_distribute_list_update(int routetype)
 368 {
 369         return 0;
 370 }
 371
 372 void isis_zebra_redistribute_set(afi_t afi, int type)
 373 {
 374         if (type == DEFAULT_ROUTE)
 375                 zclient_redistribute_default(ZEBRA_REDISTRIBUTE_DEFAULT_ADD,
 376                                              zclient, afi, VRF_DEFAULT);
 377         else
 378                 zclient_redistribute(ZEBRA_REDISTRIBUTE_ADD, zclient, afi, type,
 379                                      0, VRF_DEFAULT);
 380 }
 381
 382 void isis_zebra_redistribute_unset(afi_t afi, int type)
 383 {
 384         if (type == DEFAULT_ROUTE)
 385                 zclient_redistribute_default(ZEBRA_REDISTRIBUTE_DEFAULT_DELETE,
 386                                              zclient, afi, VRF_DEFAULT);
 387         else
 388                 zclient_redistribute(ZEBRA_REDISTRIBUTE_DELETE, zclient, afi,
 389                                      type, 0, VRF_DEFAULT);
 390 }
 391
 392 static void isis_zebra_connected(struct zclient *zclient)
 393 {
 394         zclient_send_reg_requests(zclient, VRF_DEFAULT);
 395 }
 396
 397 void isis_zebra_init(struct thread_master *master)
 398 {
 399         zclient = zclient_new(master, &zclient_options_default);
 400         zclient_init(zclient, PROTO_TYPE, 0, &isisd_privs);
 401         zclient->zebra_connected = isis_zebra_connected;
 402         zclient->router_id_update = isis_router_id_update_zebra;
 403         zclient->interface_add = isis_zebra_if_add;
 404         zclient->interface_delete = isis_zebra_if_del;
 405         zclient->interface_up = isis_zebra_if_state_up;
 406         zclient->interface_down = isis_zebra_if_state_down;
 407         zclient->interface_address_add = isis_zebra_if_address_add;
 408         zclient->interface_address_delete = isis_zebra_if_address_del;
 409         zclient->interface_link_params = isis_zebra_link_params;
 410         zclient->redistribute_route_add = isis_zebra_read;
 411         zclient->redistribute_route_del = isis_zebra_read;
 412
 413         return;
 414 }
 415
 416 void isis_zebra_stop(void)
 417 {
 418         zclient_stop(zclient);
 419         zclient_free(zclient);
 420         frr_fini();
 421 }