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(int command, struct zclient *zclient,
  57                                        zebra_size_t length, vrf_id_t vrf_id)
  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(int command, struct zclient *zclient,
  76                              zebra_size_t length, vrf_id_t vrf_id)
  77 {
  78         struct interface *ifp;
  79
  80         ifp = zebra_interface_add_read(zclient->ibuf, vrf_id);
  81
  82         if (if_is_operative(ifp))
  83                 isis_csm_state_change(IF_UP_FROM_Z, circuit_scan_by_ifp(ifp),
  84                                       ifp);
  85
  86         return 0;
  87 }
  88
  89 static int isis_zebra_if_del(int command, struct zclient *zclient,
  90                              zebra_size_t length, vrf_id_t vrf_id)
  91 {
  92         struct interface *ifp;
  93         struct stream *s;
  94
  95         s = zclient->ibuf;
  96         ifp = zebra_interface_state_read(s, vrf_id);
  97
  98         if (!ifp)
  99                 return 0;
 100
 101         if (if_is_operative(ifp))
 102                 zlog_warn("Zebra: got delete of %s, but interface is still up",
 103                           ifp->name);
 104
 105         isis_csm_state_change(IF_DOWN_FROM_Z, circuit_scan_by_ifp(ifp), ifp);
 106
 107         /* Cannot call if_delete because we should retain the pseudo interface
 108            in case there is configuration info attached to it. */
 109         if_delete_retain(ifp);
 110
 111         if_set_index(ifp, IFINDEX_INTERNAL);
 112
 113         return 0;
 114 }
 115
 116 static int isis_zebra_if_state_up(int command, struct zclient *zclient,
 117                                   zebra_size_t length, vrf_id_t vrf_id)
 118 {
 119         struct interface *ifp;
 120
 121         ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
 122
 123         if (ifp == NULL)
 124                 return 0;
 125
 126         isis_csm_state_change(IF_UP_FROM_Z, circuit_scan_by_ifp(ifp), ifp);
 127
 128         return 0;
 129 }
 130
 131 static int isis_zebra_if_state_down(int command, struct zclient *zclient,
 132                                     zebra_size_t length, vrf_id_t vrf_id)
 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(int command, struct zclient *zclient,
 151                                      zebra_size_t length, vrf_id_t vrf_id)
 152 {
 153         struct connected *c;
 154         struct prefix *p;
 155         char buf[PREFIX2STR_BUFFER];
 156
 157         c = zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_ADD,
 158                                          zclient->ibuf, vrf_id);
 159
 160         if (c == NULL)
 161                 return 0;
 162
 163         p = c->address;
 164
 165         prefix2str(p, buf, sizeof(buf));
 166 #ifdef EXTREME_DEBUG
 167         if (p->family == AF_INET)
 168                 zlog_debug("connected IP address %s", buf);
 169         if (p->family == AF_INET6)
 170                 zlog_debug("connected IPv6 address %s", buf);
 171 #endif /* EXTREME_DEBUG */
 172         if (if_is_operative(c->ifp))
 173                 isis_circuit_add_addr(circuit_scan_by_ifp(c->ifp), c);
 174
 175         return 0;
 176 }
 177
 178 static int isis_zebra_if_address_del(int command, struct zclient *client,
 179                                      zebra_size_t length, vrf_id_t vrf_id)
 180 {
 181         struct connected *c;
 182         struct interface *ifp;
 183 #ifdef EXTREME_DEBUG
 184         struct prefix *p;
 185         char buf[PREFIX2STR_BUFFER];
 186 #endif /* EXTREME_DEBUG */
 187
 188         c = zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_DELETE,
 189                                          zclient->ibuf, vrf_id);
 190
 191         if (c == NULL)
 192                 return 0;
 193
 194         ifp = c->ifp;
 195
 196 #ifdef EXTREME_DEBUG
 197         p = c->address;
 198         prefix2str(p, buf, sizeof(buf));
 199
 200         if (p->family == AF_INET)
 201                 zlog_debug("disconnected IP address %s", buf);
 202         if (p->family == AF_INET6)
 203                 zlog_debug("disconnected IPv6 address %s", buf);
 204 #endif /* EXTREME_DEBUG */
 205
 206         if (if_is_operative(ifp))
 207                 isis_circuit_del_addr(circuit_scan_by_ifp(ifp), c);
 208         connected_free(c);
 209
 210         return 0;
 211 }
 212
 213 static int isis_zebra_link_params(int command, struct zclient *zclient,
 214                                   zebra_size_t length, vrf_id_t vrf_id)
 215 {
 216         struct interface *ifp;
 217
 218         ifp = zebra_interface_link_params_read(zclient->ibuf, vrf_id);
 219
 220         if (ifp == NULL)
 221                 return 0;
 222
 223         /* Update TE TLV */
 224         isis_mpls_te_update(ifp);
 225
 226         return 0;
 227 }
 228
 229 static void isis_zebra_route_add_route(struct prefix *prefix,
 230                                        struct prefix_ipv6 *src_p,
 231                                        struct isis_route_info *route_info)
 232 {
 233         struct zapi_route api;
 234         struct zapi_nexthop *api_nh;
 235         struct isis_nexthop *nexthop;
 236         struct isis_nexthop6 *nexthop6;
 237         struct listnode *node;
 238         int count = 0;
 239
 240         if (CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED))
 241                 return;
 242
 243         memset(&api, 0, sizeof(api));
 244         api.vrf_id = VRF_DEFAULT;
 245         api.type = PROTO_TYPE;
 246         api.safi = SAFI_UNICAST;
 247         api.prefix = *prefix;
 248         if (src_p && src_p->prefixlen) {
 249                 api.src_prefix = *src_p;
 250                 SET_FLAG(api.message, ZAPI_MESSAGE_SRCPFX);
 251         }
 252         SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
 253         SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
 254         api.metric = route_info->cost;
 255 #if 0
 256         SET_FLAG(api.message, ZAPI_MESSAGE_DISTANCE);
 257         api.distance = route_info->depth;
 258 #endif
 259
 260         /* Nexthops */
 261         switch (prefix->family) {
 262         case AF_INET:
 263                 for (ALL_LIST_ELEMENTS_RO(route_info->nexthops, node,
 264                                           nexthop)) {
 265                         if (count >= MULTIPATH_NUM)
 266                                 break;
 267                         api_nh = &api.nexthops[count];
 268                         if (fabricd)
 269                                 api_nh->onlink = true;
 270                         api_nh->vrf_id = VRF_DEFAULT;
 271                         /* FIXME: can it be ? */
 272                         if (nexthop->ip.s_addr != INADDR_ANY) {
 273                                 api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
 274                                 api_nh->gate.ipv4 = nexthop->ip;
 275                         } else {
 276                                 api_nh->type = NEXTHOP_TYPE_IFINDEX;
 277                         }
 278                         api_nh->ifindex = nexthop->ifindex;
 279                         count++;
 280                 }
 281                 break;
 282         case AF_INET6:
 283                 for (ALL_LIST_ELEMENTS_RO(route_info->nexthops6, node,
 284                                           nexthop6)) {
 285                         if (count >= MULTIPATH_NUM)
 286                                 break;
 287                         if (!IN6_IS_ADDR_LINKLOCAL(&nexthop6->ip6)
 288                             && !IN6_IS_ADDR_UNSPECIFIED(&nexthop6->ip6)) {
 289                                 continue;
 290                         }
 291
 292                         api_nh = &api.nexthops[count];
 293                         if (fabricd)
 294                                 api_nh->onlink = true;
 295                         api_nh->vrf_id = VRF_DEFAULT;
 296                         api_nh->gate.ipv6 = nexthop6->ip6;
 297                         api_nh->ifindex = nexthop6->ifindex;
 298                         api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX;
 299                         count++;
 300                 }
 301                 break;
 302         }
 303         if (!count)
 304                 return;
 305
 306         api.nexthop_num = count;
 307
 308         zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api);
 309         SET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
 310         UNSET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_RESYNC);
 311 }
 312
 313 static void isis_zebra_route_del_route(struct prefix *prefix,
 314                                        struct prefix_ipv6 *src_p,
 315                                        struct isis_route_info *route_info)
 316 {
 317         struct zapi_route api;
 318
 319         if (!CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED))
 320                 return;
 321
 322         memset(&api, 0, sizeof(api));
 323         api.vrf_id = VRF_DEFAULT;
 324         api.type = PROTO_TYPE;
 325         api.safi = SAFI_UNICAST;
 326         api.prefix = *prefix;
 327         if (src_p && src_p->prefixlen) {
 328                 api.src_prefix = *src_p;
 329                 SET_FLAG(api.message, ZAPI_MESSAGE_SRCPFX);
 330         }
 331
 332         zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
 333         UNSET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
 334 }
 335
 336 void isis_zebra_route_update(struct prefix *prefix,
 337                              struct prefix_ipv6 *src_p,
 338                              struct isis_route_info *route_info)
 339 {
 340         if (zclient->sock < 0)
 341                 return;
 342
 343         if (CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ACTIVE))
 344                 isis_zebra_route_add_route(prefix, src_p, route_info);
 345         else
 346                 isis_zebra_route_del_route(prefix, src_p, route_info);
 347 }
 348
 349 static int isis_zebra_read(int command, struct zclient *zclient,
 350                            zebra_size_t length, vrf_id_t vrf_id)
 351 {
 352         struct zapi_route api;
 353
 354         if (zapi_route_decode(zclient->ibuf, &api) < 0)
 355                 return -1;
 356
 357         if (api.prefix.family == AF_INET6
 358             && IN6_IS_ADDR_LINKLOCAL(&api.prefix.u.prefix6))
 359                 return 0;
 360
 361         /*
 362          * Avoid advertising a false default reachability. (A default
 363          * route installed by IS-IS gets redistributed from zebra back
 364          * into IS-IS causing us to start advertising default reachabity
 365          * without this check)
 366          */
 367         if (api.prefix.prefixlen == 0
 368             && api.src_prefix.prefixlen == 0
 369             && api.type == PROTO_TYPE) {
 370                 command = ZEBRA_REDISTRIBUTE_ROUTE_DEL;
 371         }
 372
 373         if (command == ZEBRA_REDISTRIBUTE_ROUTE_ADD)
 374                 isis_redist_add(api.type, &api.prefix, &api.src_prefix,
 375                                 api.distance, api.metric);
 376         else
 377                 isis_redist_delete(api.type, &api.prefix, &api.src_prefix);
 378
 379         return 0;
 380 }
 381
 382 int isis_distribute_list_update(int routetype)
 383 {
 384         return 0;
 385 }
 386
 387 void isis_zebra_redistribute_set(afi_t afi, int type)
 388 {
 389         if (type == DEFAULT_ROUTE)
 390                 zclient_redistribute_default(ZEBRA_REDISTRIBUTE_DEFAULT_ADD,
 391                                              zclient, afi, VRF_DEFAULT);
 392         else
 393                 zclient_redistribute(ZEBRA_REDISTRIBUTE_ADD, zclient, afi, type,
 394                                      0, VRF_DEFAULT);
 395 }
 396
 397 void isis_zebra_redistribute_unset(afi_t afi, int type)
 398 {
 399         if (type == DEFAULT_ROUTE)
 400                 zclient_redistribute_default(ZEBRA_REDISTRIBUTE_DEFAULT_DELETE,
 401                                              zclient, afi, VRF_DEFAULT);
 402         else
 403                 zclient_redistribute(ZEBRA_REDISTRIBUTE_DELETE, zclient, afi,
 404                                      type, 0, VRF_DEFAULT);
 405 }
 406
 407 static void isis_zebra_connected(struct zclient *zclient)
 408 {
 409         zclient_send_reg_requests(zclient, VRF_DEFAULT);
 410 }
 411
 412 void isis_zebra_init(struct thread_master *master)
 413 {
 414         zclient = zclient_new(master, &zclient_options_default);
 415         zclient_init(zclient, PROTO_TYPE, 0, &isisd_privs);
 416         zclient->zebra_connected = isis_zebra_connected;
 417         zclient->router_id_update = isis_router_id_update_zebra;
 418         zclient->interface_add = isis_zebra_if_add;
 419         zclient->interface_delete = isis_zebra_if_del;
 420         zclient->interface_up = isis_zebra_if_state_up;
 421         zclient->interface_down = isis_zebra_if_state_down;
 422         zclient->interface_address_add = isis_zebra_if_address_add;
 423         zclient->interface_address_delete = isis_zebra_if_address_del;
 424         zclient->interface_link_params = isis_zebra_link_params;
 425         zclient->redistribute_route_add = isis_zebra_read;
 426         zclient->redistribute_route_del = isis_zebra_read;
 427
 428         return;
 429 }
 430
 431 void isis_zebra_stop(void)
 432 {
 433         zclient_stop(zclient);
 434         zclient_free(zclient);
 435         frr_fini();
 436 }