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 DEFINE_HOOK(isis_if_new_hook, (struct interface *ifp), (ifp))
  57
  58 /* Router-id update message from zebra. */
  59 static int isis_router_id_update_zebra(ZAPI_CALLBACK_ARGS)
  60 {
  61         struct isis_area *area;
  62         struct listnode *node;
  63         struct prefix router_id;
  64
  65         zebra_router_id_update_read(zclient->ibuf, &router_id);
  66         if (isis->router_id == router_id.u.prefix4.s_addr)
  67                 return 0;
  68
  69         isis->router_id = router_id.u.prefix4.s_addr;
  70         for (ALL_LIST_ELEMENTS_RO(isis->area_list, node, area))
  71                 if (listcount(area->area_addrs) > 0)
  72                         lsp_regenerate_schedule(area, area->is_type, 0);
  73
  74         return 0;
  75 }
  76
  77 static int isis_zebra_if_add(ZAPI_CALLBACK_ARGS)
  78 {
  79         struct interface *ifp;
  80
  81         ifp = zebra_interface_add_read(zclient->ibuf, vrf_id);
  82
  83         if (if_is_operative(ifp))
  84                 isis_csm_state_change(IF_UP_FROM_Z, circuit_scan_by_ifp(ifp),
  85                                       ifp);
  86
  87         hook_call(isis_if_new_hook, ifp);
  88
  89         return 0;
  90 }
  91
  92 static int isis_zebra_if_del(ZAPI_CALLBACK_ARGS)
  93 {
  94         struct interface *ifp;
  95         struct stream *s;
  96
  97         s = zclient->ibuf;
  98         ifp = zebra_interface_state_read(s, vrf_id);
  99
 100         if (!ifp)
 101                 return 0;
 102
 103         if (if_is_operative(ifp))
 104                 zlog_warn("Zebra: got delete of %s, but interface is still up",
 105                           ifp->name);
 106
 107         isis_csm_state_change(IF_DOWN_FROM_Z, circuit_scan_by_ifp(ifp), ifp);
 108
 109         /* Cannot call if_delete because we should retain the pseudo interface
 110            in case there is configuration info attached to it. */
 111         if_delete_retain(ifp);
 112
 113         if_set_index(ifp, IFINDEX_INTERNAL);
 114
 115         return 0;
 116 }
 117
 118 static int isis_zebra_if_state_up(ZAPI_CALLBACK_ARGS)
 119 {
 120         struct interface *ifp;
 121
 122         ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
 123
 124         if (ifp == NULL)
 125                 return 0;
 126
 127         isis_csm_state_change(IF_UP_FROM_Z, circuit_scan_by_ifp(ifp), ifp);
 128
 129         return 0;
 130 }
 131
 132 static int isis_zebra_if_state_down(ZAPI_CALLBACK_ARGS)
 133 {
 134         struct interface *ifp;
 135         struct isis_circuit *circuit;
 136
 137         ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
 138
 139         if (ifp == NULL)
 140                 return 0;
 141
 142         circuit = isis_csm_state_change(IF_DOWN_FROM_Z,
 143                                         circuit_scan_by_ifp(ifp), ifp);
 144         if (circuit)
 145                 SET_FLAG(circuit->flags, ISIS_CIRCUIT_FLAPPED_AFTER_SPF);
 146
 147         return 0;
 148 }
 149
 150 static int isis_zebra_if_address_add(ZAPI_CALLBACK_ARGS)
 151 {
 152         struct connected *c;
 153         struct prefix *p;
 154         char buf[PREFIX2STR_BUFFER];
 155
 156         c = zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_ADD,
 157                                          zclient->ibuf, vrf_id);
 158
 159         if (c == NULL)
 160                 return 0;
 161
 162         p = c->address;
 163
 164         prefix2str(p, buf, sizeof(buf));
 165 #ifdef EXTREME_DEBUG
 166         if (p->family == AF_INET)
 167                 zlog_debug("connected IP address %s", buf);
 168         if (p->family == AF_INET6)
 169                 zlog_debug("connected IPv6 address %s", buf);
 170 #endif /* EXTREME_DEBUG */
 171         if (if_is_operative(c->ifp))
 172                 isis_circuit_add_addr(circuit_scan_by_ifp(c->ifp), c);
 173
 174         return 0;
 175 }
 176
 177 static int isis_zebra_if_address_del(ZAPI_CALLBACK_ARGS)
 178 {
 179         struct connected *c;
 180         struct interface *ifp;
 181 #ifdef EXTREME_DEBUG
 182         struct prefix *p;
 183         char buf[PREFIX2STR_BUFFER];
 184 #endif /* EXTREME_DEBUG */
 185
 186         c = zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_DELETE,
 187                                          zclient->ibuf, vrf_id);
 188
 189         if (c == NULL)
 190                 return 0;
 191
 192         ifp = c->ifp;
 193
 194 #ifdef EXTREME_DEBUG
 195         p = c->address;
 196         prefix2str(p, buf, sizeof(buf));
 197
 198         if (p->family == AF_INET)
 199                 zlog_debug("disconnected IP address %s", buf);
 200         if (p->family == AF_INET6)
 201                 zlog_debug("disconnected IPv6 address %s", buf);
 202 #endif /* EXTREME_DEBUG */
 203
 204         if (if_is_operative(ifp))
 205                 isis_circuit_del_addr(circuit_scan_by_ifp(ifp), c);
 206         connected_free(c);
 207
 208         return 0;
 209 }
 210
 211 static int isis_zebra_link_params(ZAPI_CALLBACK_ARGS)
 212 {
 213         struct interface *ifp;
 214
 215         ifp = zebra_interface_link_params_read(zclient->ibuf, vrf_id);
 216
 217         if (ifp == NULL)
 218                 return 0;
 219
 220         /* Update TE TLV */
 221         isis_mpls_te_update(ifp);
 222
 223         return 0;
 224 }
 225
 226 void isis_zebra_route_add_route(struct prefix *prefix,
 227                                 struct prefix_ipv6 *src_p,
 228                                 struct isis_route_info *route_info)
 229 {
 230         struct zapi_route api;
 231         struct zapi_nexthop *api_nh;
 232         struct isis_nexthop *nexthop;
 233         struct listnode *node;
 234         int count = 0;
 235
 236         if (zclient->sock < 0)
 237                 return;
 238
 239         memset(&api, 0, sizeof(api));
 240         api.vrf_id = VRF_DEFAULT;
 241         api.type = PROTO_TYPE;
 242         api.safi = SAFI_UNICAST;
 243         api.prefix = *prefix;
 244         if (src_p && src_p->prefixlen) {
 245                 api.src_prefix = *src_p;
 246                 SET_FLAG(api.message, ZAPI_MESSAGE_SRCPFX);
 247         }
 248         SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
 249         SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
 250         api.metric = route_info->cost;
 251 #if 0
 252         SET_FLAG(api.message, ZAPI_MESSAGE_DISTANCE);
 253         api.distance = route_info->depth;
 254 #endif
 255
 256         /* Nexthops */
 257         for (ALL_LIST_ELEMENTS_RO(route_info->nexthops, node, nexthop)) {
 258                 if (count >= MULTIPATH_NUM)
 259                         break;
 260                 api_nh = &api.nexthops[count];
 261                 if (fabricd)
 262                         api_nh->onlink = true;
 263                 api_nh->vrf_id = VRF_DEFAULT;
 264
 265                 switch (nexthop->family) {
 266                 case AF_INET:
 267                         /* FIXME: can it be ? */
 268                         if (nexthop->ip.ipv4.s_addr != INADDR_ANY) {
 269                                 api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
 270                                 api_nh->gate.ipv4 = nexthop->ip.ipv4;
 271                         } else {
 272                                 api_nh->type = NEXTHOP_TYPE_IFINDEX;
 273                         }
 274                         break;
 275                 case AF_INET6:
 276                         if (!IN6_IS_ADDR_LINKLOCAL(&nexthop->ip.ipv6)
 277                             && !IN6_IS_ADDR_UNSPECIFIED(&nexthop->ip.ipv6)) {
 278                                 continue;
 279                         }
 280                         api_nh->gate.ipv6 = nexthop->ip.ipv6;
 281                         api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX;
 282                         break;
 283                 default:
 284                         flog_err(EC_LIB_DEVELOPMENT,
 285                                  "%s: unknown address family [%d]", __func__,
 286                                  nexthop->family);
 287                         exit(1);
 288                 }
 289
 290                 api_nh->ifindex = nexthop->ifindex;
 291                 count++;
 292         }
 293         if (!count)
 294                 return;
 295
 296         api.nexthop_num = count;
 297
 298         zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api);
 299 }
 300
 301 void isis_zebra_route_del_route(struct prefix *prefix,
 302                                 struct prefix_ipv6 *src_p,
 303                                 struct isis_route_info *route_info)
 304 {
 305         struct zapi_route api;
 306
 307         if (zclient->sock < 0)
 308                 return;
 309
 310         memset(&api, 0, sizeof(api));
 311         api.vrf_id = VRF_DEFAULT;
 312         api.type = PROTO_TYPE;
 313         api.safi = SAFI_UNICAST;
 314         api.prefix = *prefix;
 315         if (src_p && src_p->prefixlen) {
 316                 api.src_prefix = *src_p;
 317                 SET_FLAG(api.message, ZAPI_MESSAGE_SRCPFX);
 318         }
 319
 320         zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
 321 }
 322
 323 static int isis_zebra_read(ZAPI_CALLBACK_ARGS)
 324 {
 325         struct zapi_route api;
 326
 327         if (zapi_route_decode(zclient->ibuf, &api) < 0)
 328                 return -1;
 329
 330         if (api.prefix.family == AF_INET6
 331             && IN6_IS_ADDR_LINKLOCAL(&api.prefix.u.prefix6))
 332                 return 0;
 333
 334         /*
 335          * Avoid advertising a false default reachability. (A default
 336          * route installed by IS-IS gets redistributed from zebra back
 337          * into IS-IS causing us to start advertising default reachabity
 338          * without this check)
 339          */
 340         if (api.prefix.prefixlen == 0
 341             && api.src_prefix.prefixlen == 0
 342             && api.type == PROTO_TYPE) {
 343                 cmd = ZEBRA_REDISTRIBUTE_ROUTE_DEL;
 344         }
 345
 346         if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD)
 347                 isis_redist_add(api.type, &api.prefix, &api.src_prefix,
 348                                 api.distance, api.metric);
 349         else
 350                 isis_redist_delete(api.type, &api.prefix, &api.src_prefix);
 351
 352         return 0;
 353 }
 354
 355 int isis_distribute_list_update(int routetype)
 356 {
 357         return 0;
 358 }
 359
 360 void isis_zebra_redistribute_set(afi_t afi, int type)
 361 {
 362         if (type == DEFAULT_ROUTE)
 363                 zclient_redistribute_default(ZEBRA_REDISTRIBUTE_DEFAULT_ADD,
 364                                              zclient, afi, VRF_DEFAULT);
 365         else
 366                 zclient_redistribute(ZEBRA_REDISTRIBUTE_ADD, zclient, afi, type,
 367                                      0, VRF_DEFAULT);
 368 }
 369
 370 void isis_zebra_redistribute_unset(afi_t afi, int type)
 371 {
 372         if (type == DEFAULT_ROUTE)
 373                 zclient_redistribute_default(ZEBRA_REDISTRIBUTE_DEFAULT_DELETE,
 374                                              zclient, afi, VRF_DEFAULT);
 375         else
 376                 zclient_redistribute(ZEBRA_REDISTRIBUTE_DELETE, zclient, afi,
 377                                      type, 0, VRF_DEFAULT);
 378 }
 379
 380 static void isis_zebra_connected(struct zclient *zclient)
 381 {
 382         zclient_send_reg_requests(zclient, VRF_DEFAULT);
 383 }
 384
 385 void isis_zebra_init(struct thread_master *master)
 386 {
 387         zclient = zclient_new(master, &zclient_options_default);
 388         zclient_init(zclient, PROTO_TYPE, 0, &isisd_privs);
 389         zclient->zebra_connected = isis_zebra_connected;
 390         zclient->router_id_update = isis_router_id_update_zebra;
 391         zclient->interface_add = isis_zebra_if_add;
 392         zclient->interface_delete = isis_zebra_if_del;
 393         zclient->interface_up = isis_zebra_if_state_up;
 394         zclient->interface_down = isis_zebra_if_state_down;
 395         zclient->interface_address_add = isis_zebra_if_address_add;
 396         zclient->interface_address_delete = isis_zebra_if_address_del;
 397         zclient->interface_link_params = isis_zebra_link_params;
 398         zclient->redistribute_route_add = isis_zebra_read;
 399         zclient->redistribute_route_del = isis_zebra_read;
 400
 401         return;
 402 }
 403
 404 void isis_zebra_stop(void)
 405 {
 406         zclient_stop(zclient);
 407         zclient_free(zclient);
 408         frr_fini();
 409 }