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/isis_constants.h"
  41 #include "isisd/isis_common.h"
  42 #include "isisd/isis_flags.h"
  43 #include "isisd/isis_misc.h"
  44 #include "isisd/isis_circuit.h"
  45 #include "isisd/isisd.h"
  46 #include "isisd/isis_circuit.h"
  47 #include "isisd/isis_csm.h"
  48 #include "isisd/isis_lsp.h"
  49 #include "isisd/isis_route.h"
  50 #include "isisd/isis_zebra.h"
  51 #include "isisd/isis_te.h"
  52
  53 struct zclient *zclient = NULL;
  54
  55 /* Router-id update message from zebra. */
  56 static int isis_router_id_update_zebra(ZAPI_CALLBACK_ARGS)
  57 {
  58         struct isis_area *area;
  59         struct listnode *node;
  60         struct prefix router_id;
  61
  62         zebra_router_id_update_read(zclient->ibuf, &router_id);
  63         if (isis->router_id == router_id.u.prefix4.s_addr)
  64                 return 0;
  65
  66         isis->router_id = router_id.u.prefix4.s_addr;
  67         for (ALL_LIST_ELEMENTS_RO(isis->area_list, node, area))
  68                 if (listcount(area->area_addrs) > 0)
  69                         lsp_regenerate_schedule(area, area->is_type, 0);
  70
  71         return 0;
  72 }
  73
  74 static int isis_zebra_if_add(ZAPI_CALLBACK_ARGS)
  75 {
  76         struct interface *ifp;
  77
  78         ifp = zebra_interface_add_read(zclient->ibuf, vrf_id);
  79
  80         if (if_is_operative(ifp))
  81                 isis_csm_state_change(IF_UP_FROM_Z, circuit_scan_by_ifp(ifp),
  82                                       ifp);
  83
  84         return 0;
  85 }
  86
  87 static int isis_zebra_if_del(ZAPI_CALLBACK_ARGS)
  88 {
  89         struct interface *ifp;
  90         struct stream *s;
  91
  92         s = zclient->ibuf;
  93         ifp = zebra_interface_state_read(s, vrf_id);
  94
  95         if (!ifp)
  96                 return 0;
  97
  98         if (if_is_operative(ifp))
  99                 zlog_warn("Zebra: got delete of %s, but interface is still up",
 100                           ifp->name);
 101
 102         isis_csm_state_change(IF_DOWN_FROM_Z, circuit_scan_by_ifp(ifp), ifp);
 103
 104         /* Cannot call if_delete because we should retain the pseudo interface
 105            in case there is configuration info attached to it. */
 106         if_delete_retain(ifp);
 107
 108         if_set_index(ifp, IFINDEX_INTERNAL);
 109
 110         return 0;
 111 }
 112
 113 static int isis_zebra_if_state_up(ZAPI_CALLBACK_ARGS)
 114 {
 115         struct interface *ifp;
 116
 117         ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
 118
 119         if (ifp == NULL)
 120                 return 0;
 121
 122         isis_csm_state_change(IF_UP_FROM_Z, circuit_scan_by_ifp(ifp), ifp);
 123
 124         return 0;
 125 }
 126
 127 static int isis_zebra_if_state_down(ZAPI_CALLBACK_ARGS)
 128 {
 129         struct interface *ifp;
 130         struct isis_circuit *circuit;
 131
 132         ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
 133
 134         if (ifp == NULL)
 135                 return 0;
 136
 137         circuit = isis_csm_state_change(IF_DOWN_FROM_Z,
 138                                         circuit_scan_by_ifp(ifp), ifp);
 139         if (circuit)
 140                 SET_FLAG(circuit->flags, ISIS_CIRCUIT_FLAPPED_AFTER_SPF);
 141
 142         return 0;
 143 }
 144
 145 static int isis_zebra_if_address_add(ZAPI_CALLBACK_ARGS)
 146 {
 147         struct connected *c;
 148         struct prefix *p;
 149         char buf[PREFIX2STR_BUFFER];
 150
 151         c = zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_ADD,
 152                                          zclient->ibuf, vrf_id);
 153
 154         if (c == NULL)
 155                 return 0;
 156
 157         p = c->address;
 158
 159         prefix2str(p, buf, sizeof(buf));
 160 #ifdef EXTREME_DEBUG
 161         if (p->family == AF_INET)
 162                 zlog_debug("connected IP address %s", buf);
 163         if (p->family == AF_INET6)
 164                 zlog_debug("connected IPv6 address %s", buf);
 165 #endif /* EXTREME_DEBUG */
 166         if (if_is_operative(c->ifp))
 167                 isis_circuit_add_addr(circuit_scan_by_ifp(c->ifp), c);
 168
 169         return 0;
 170 }
 171
 172 static int isis_zebra_if_address_del(ZAPI_CALLBACK_ARGS)
 173 {
 174         struct connected *c;
 175         struct interface *ifp;
 176 #ifdef EXTREME_DEBUG
 177         struct prefix *p;
 178         char buf[PREFIX2STR_BUFFER];
 179 #endif /* EXTREME_DEBUG */
 180
 181         c = zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_DELETE,
 182                                          zclient->ibuf, vrf_id);
 183
 184         if (c == NULL)
 185                 return 0;
 186
 187         ifp = c->ifp;
 188
 189 #ifdef EXTREME_DEBUG
 190         p = c->address;
 191         prefix2str(p, buf, sizeof(buf));
 192
 193         if (p->family == AF_INET)
 194                 zlog_debug("disconnected IP address %s", buf);
 195         if (p->family == AF_INET6)
 196                 zlog_debug("disconnected IPv6 address %s", buf);
 197 #endif /* EXTREME_DEBUG */
 198
 199         if (if_is_operative(ifp))
 200                 isis_circuit_del_addr(circuit_scan_by_ifp(ifp), c);
 201         connected_free(c);
 202
 203         return 0;
 204 }
 205
 206 static int isis_zebra_link_params(ZAPI_CALLBACK_ARGS)
 207 {
 208         struct interface *ifp;
 209
 210         ifp = zebra_interface_link_params_read(zclient->ibuf, vrf_id);
 211
 212         if (ifp == NULL)
 213                 return 0;
 214
 215         /* Update TE TLV */
 216         isis_mpls_te_update(ifp);
 217
 218         return 0;
 219 }
 220
 221 static void isis_zebra_route_add_route(struct prefix *prefix,
 222                                        struct prefix_ipv6 *src_p,
 223                                        struct isis_route_info *route_info)
 224 {
 225         struct zapi_route api;
 226         struct zapi_nexthop *api_nh;
 227         struct isis_nexthop *nexthop;
 228         struct isis_nexthop6 *nexthop6;
 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         switch (prefix->family) {
 254         case AF_INET:
 255                 for (ALL_LIST_ELEMENTS_RO(route_info->nexthops, node,
 256                                           nexthop)) {
 257                         if (count >= MULTIPATH_NUM)
 258                                 break;
 259                         api_nh = &api.nexthops[count];
 260                         if (fabricd)
 261                                 api_nh->onlink = true;
 262                         api_nh->vrf_id = VRF_DEFAULT;
 263                         /* FIXME: can it be ? */
 264                         if (nexthop->ip.s_addr != INADDR_ANY) {
 265                                 api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
 266                                 api_nh->gate.ipv4 = nexthop->ip;
 267                         } else {
 268                                 api_nh->type = NEXTHOP_TYPE_IFINDEX;
 269                         }
 270                         api_nh->ifindex = nexthop->ifindex;
 271                         count++;
 272                 }
 273                 break;
 274         case AF_INET6:
 275                 for (ALL_LIST_ELEMENTS_RO(route_info->nexthops6, node,
 276                                           nexthop6)) {
 277                         if (count >= MULTIPATH_NUM)
 278                                 break;
 279                         if (!IN6_IS_ADDR_LINKLOCAL(&nexthop6->ip6)
 280                             && !IN6_IS_ADDR_UNSPECIFIED(&nexthop6->ip6)) {
 281                                 continue;
 282                         }
 283
 284                         api_nh = &api.nexthops[count];
 285                         if (fabricd)
 286                                 api_nh->onlink = true;
 287                         api_nh->vrf_id = VRF_DEFAULT;
 288                         api_nh->gate.ipv6 = nexthop6->ip6;
 289                         api_nh->ifindex = nexthop6->ifindex;
 290                         api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX;
 291                         count++;
 292                 }
 293                 break;
 294         }
 295         if (!count)
 296                 return;
 297
 298         api.nexthop_num = count;
 299
 300         zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api);
 301         SET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
 302         UNSET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_RESYNC);
 303 }
 304
 305 static void isis_zebra_route_del_route(struct prefix *prefix,
 306                                        struct prefix_ipv6 *src_p,
 307                                        struct isis_route_info *route_info)
 308 {
 309         struct zapi_route api;
 310
 311         if (!CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED))
 312                 return;
 313
 314         memset(&api, 0, sizeof(api));
 315         api.vrf_id = VRF_DEFAULT;
 316         api.type = PROTO_TYPE;
 317         api.safi = SAFI_UNICAST;
 318         api.prefix = *prefix;
 319         if (src_p && src_p->prefixlen) {
 320                 api.src_prefix = *src_p;
 321                 SET_FLAG(api.message, ZAPI_MESSAGE_SRCPFX);
 322         }
 323
 324         zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
 325         UNSET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
 326 }
 327
 328 void isis_zebra_route_update(struct prefix *prefix,
 329                              struct prefix_ipv6 *src_p,
 330                              struct isis_route_info *route_info)
 331 {
 332         if (zclient->sock < 0)
 333                 return;
 334
 335         if (CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ACTIVE))
 336                 isis_zebra_route_add_route(prefix, src_p, route_info);
 337         else
 338                 isis_zebra_route_del_route(prefix, src_p, route_info);
 339 }
 340
 341 static int isis_zebra_read(ZAPI_CALLBACK_ARGS)
 342 {
 343         struct zapi_route api;
 344
 345         if (zapi_route_decode(zclient->ibuf, &api) < 0)
 346                 return -1;
 347
 348         if (api.prefix.family == AF_INET6
 349             && IN6_IS_ADDR_LINKLOCAL(&api.prefix.u.prefix6))
 350                 return 0;
 351
 352         /*
 353          * Avoid advertising a false default reachability. (A default
 354          * route installed by IS-IS gets redistributed from zebra back
 355          * into IS-IS causing us to start advertising default reachabity
 356          * without this check)
 357          */
 358         if (api.prefix.prefixlen == 0
 359             && api.src_prefix.prefixlen == 0
 360             && api.type == PROTO_TYPE) {
 361                 cmd = ZEBRA_REDISTRIBUTE_ROUTE_DEL;
 362         }
 363
 364         if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD)
 365                 isis_redist_add(api.type, &api.prefix, &api.src_prefix,
 366                                 api.distance, api.metric);
 367         else
 368                 isis_redist_delete(api.type, &api.prefix, &api.src_prefix);
 369
 370         return 0;
 371 }
 372
 373 int isis_distribute_list_update(int routetype)
 374 {
 375         return 0;
 376 }
 377
 378 void isis_zebra_redistribute_set(afi_t afi, int type)
 379 {
 380         if (type == DEFAULT_ROUTE)
 381                 zclient_redistribute_default(ZEBRA_REDISTRIBUTE_DEFAULT_ADD,
 382                                              zclient, afi, VRF_DEFAULT);
 383         else
 384                 zclient_redistribute(ZEBRA_REDISTRIBUTE_ADD, zclient, afi, type,
 385                                      0, VRF_DEFAULT);
 386 }
 387
 388 void isis_zebra_redistribute_unset(afi_t afi, int type)
 389 {
 390         if (type == DEFAULT_ROUTE)
 391                 zclient_redistribute_default(ZEBRA_REDISTRIBUTE_DEFAULT_DELETE,
 392                                              zclient, afi, VRF_DEFAULT);
 393         else
 394                 zclient_redistribute(ZEBRA_REDISTRIBUTE_DELETE, zclient, afi,
 395                                      type, 0, VRF_DEFAULT);
 396 }
 397
 398 static void isis_zebra_connected(struct zclient *zclient)
 399 {
 400         zclient_send_reg_requests(zclient, VRF_DEFAULT);
 401 }
 402
 403 void isis_zebra_init(struct thread_master *master)
 404 {
 405         zclient = zclient_new(master, &zclient_options_default);
 406         zclient_init(zclient, PROTO_TYPE, 0, &isisd_privs);
 407         zclient->zebra_connected = isis_zebra_connected;
 408         zclient->router_id_update = isis_router_id_update_zebra;
 409         zclient->interface_add = isis_zebra_if_add;
 410         zclient->interface_delete = isis_zebra_if_del;
 411         zclient->interface_up = isis_zebra_if_state_up;
 412         zclient->interface_down = isis_zebra_if_state_down;
 413         zclient->interface_address_add = isis_zebra_if_address_add;
 414         zclient->interface_address_delete = isis_zebra_if_address_del;
 415         zclient->interface_link_params = isis_zebra_link_params;
 416         zclient->redistribute_route_add = isis_zebra_read;
 417         zclient->redistribute_route_del = isis_zebra_read;
 418
 419         return;
 420 }
 421
 422 void isis_zebra_stop(void)
 423 {
 424         zclient_stop(zclient);
 425         zclient_free(zclient);
 426         frr_fini();
 427 }