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_address_add(ZAPI_CALLBACK_ARGS)
  76 {
  77         struct connected *c;
  78         struct prefix *p;
  79         char buf[PREFIX2STR_BUFFER];
  80
  81         c = zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_ADD,
  82                                          zclient->ibuf, vrf_id);
  83
  84         if (c == NULL)
  85                 return 0;
  86
  87         p = c->address;
  88
  89         prefix2str(p, buf, sizeof(buf));
  90 #ifdef EXTREME_DEBUG
  91         if (p->family == AF_INET)
  92                 zlog_debug("connected IP address %s", buf);
  93         if (p->family == AF_INET6)
  94                 zlog_debug("connected IPv6 address %s", buf);
  95 #endif /* EXTREME_DEBUG */
  96         if (if_is_operative(c->ifp))
  97                 isis_circuit_add_addr(circuit_scan_by_ifp(c->ifp), c);
  98
  99         return 0;
 100 }
 101
 102 static int isis_zebra_if_address_del(ZAPI_CALLBACK_ARGS)
 103 {
 104         struct connected *c;
 105         struct interface *ifp;
 106 #ifdef EXTREME_DEBUG
 107         struct prefix *p;
 108         char buf[PREFIX2STR_BUFFER];
 109 #endif /* EXTREME_DEBUG */
 110
 111         c = zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_DELETE,
 112                                          zclient->ibuf, vrf_id);
 113
 114         if (c == NULL)
 115                 return 0;
 116
 117         ifp = c->ifp;
 118
 119 #ifdef EXTREME_DEBUG
 120         p = c->address;
 121         prefix2str(p, buf, sizeof(buf));
 122
 123         if (p->family == AF_INET)
 124                 zlog_debug("disconnected IP address %s", buf);
 125         if (p->family == AF_INET6)
 126                 zlog_debug("disconnected IPv6 address %s", buf);
 127 #endif /* EXTREME_DEBUG */
 128
 129         if (if_is_operative(ifp))
 130                 isis_circuit_del_addr(circuit_scan_by_ifp(ifp), c);
 131         connected_free(&c);
 132
 133         return 0;
 134 }
 135
 136 static int isis_zebra_link_params(ZAPI_CALLBACK_ARGS)
 137 {
 138         struct interface *ifp;
 139
 140         ifp = zebra_interface_link_params_read(zclient->ibuf, vrf_id);
 141
 142         if (ifp == NULL)
 143                 return 0;
 144
 145         /* Update TE TLV */
 146         isis_mpls_te_update(ifp);
 147
 148         return 0;
 149 }
 150
 151 void isis_zebra_route_add_route(struct prefix *prefix,
 152                                 struct prefix_ipv6 *src_p,
 153                                 struct isis_route_info *route_info)
 154 {
 155         struct zapi_route api;
 156         struct zapi_nexthop *api_nh;
 157         struct isis_nexthop *nexthop;
 158         struct listnode *node;
 159         int count = 0;
 160
 161         if (zclient->sock < 0)
 162                 return;
 163
 164         memset(&api, 0, sizeof(api));
 165         api.vrf_id = VRF_DEFAULT;
 166         api.type = PROTO_TYPE;
 167         api.safi = SAFI_UNICAST;
 168         api.prefix = *prefix;
 169         if (src_p && src_p->prefixlen) {
 170                 api.src_prefix = *src_p;
 171                 SET_FLAG(api.message, ZAPI_MESSAGE_SRCPFX);
 172         }
 173         SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
 174         SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
 175         api.metric = route_info->cost;
 176 #if 0
 177         SET_FLAG(api.message, ZAPI_MESSAGE_DISTANCE);
 178         api.distance = route_info->depth;
 179 #endif
 180
 181         /* Nexthops */
 182         for (ALL_LIST_ELEMENTS_RO(route_info->nexthops, node, nexthop)) {
 183                 if (count >= MULTIPATH_NUM)
 184                         break;
 185                 api_nh = &api.nexthops[count];
 186                 if (fabricd)
 187                         SET_FLAG(api_nh->flags, ZAPI_NEXTHOP_FLAG_ONLINK);
 188                 api_nh->vrf_id = VRF_DEFAULT;
 189
 190                 switch (nexthop->family) {
 191                 case AF_INET:
 192                         /* FIXME: can it be ? */
 193                         if (nexthop->ip.ipv4.s_addr != INADDR_ANY) {
 194                                 api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
 195                                 api_nh->gate.ipv4 = nexthop->ip.ipv4;
 196                         } else {
 197                                 api_nh->type = NEXTHOP_TYPE_IFINDEX;
 198                         }
 199                         break;
 200                 case AF_INET6:
 201                         if (!IN6_IS_ADDR_LINKLOCAL(&nexthop->ip.ipv6)
 202                             && !IN6_IS_ADDR_UNSPECIFIED(&nexthop->ip.ipv6)) {
 203                                 continue;
 204                         }
 205                         api_nh->gate.ipv6 = nexthop->ip.ipv6;
 206                         api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX;
 207                         break;
 208                 default:
 209                         flog_err(EC_LIB_DEVELOPMENT,
 210                                  "%s: unknown address family [%d]", __func__,
 211                                  nexthop->family);
 212                         exit(1);
 213                 }
 214
 215                 api_nh->ifindex = nexthop->ifindex;
 216                 count++;
 217         }
 218         if (!count)
 219                 return;
 220
 221         api.nexthop_num = count;
 222
 223         zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api);
 224 }
 225
 226 void isis_zebra_route_del_route(struct prefix *prefix,
 227                                 struct prefix_ipv6 *src_p,
 228                                 struct isis_route_info *route_info)
 229 {
 230         struct zapi_route api;
 231
 232         if (zclient->sock < 0)
 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
 245         zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
 246 }
 247
 248 static int isis_zebra_read(ZAPI_CALLBACK_ARGS)
 249 {
 250         struct zapi_route api;
 251
 252         if (zapi_route_decode(zclient->ibuf, &api) < 0)
 253                 return -1;
 254
 255         if (api.prefix.family == AF_INET6
 256             && IN6_IS_ADDR_LINKLOCAL(&api.prefix.u.prefix6))
 257                 return 0;
 258
 259         /*
 260          * Avoid advertising a false default reachability. (A default
 261          * route installed by IS-IS gets redistributed from zebra back
 262          * into IS-IS causing us to start advertising default reachabity
 263          * without this check)
 264          */
 265         if (api.prefix.prefixlen == 0
 266             && api.src_prefix.prefixlen == 0
 267             && api.type == PROTO_TYPE) {
 268                 cmd = ZEBRA_REDISTRIBUTE_ROUTE_DEL;
 269         }
 270
 271         if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD)
 272                 isis_redist_add(api.type, &api.prefix, &api.src_prefix,
 273                                 api.distance, api.metric);
 274         else
 275                 isis_redist_delete(api.type, &api.prefix, &api.src_prefix);
 276
 277         return 0;
 278 }
 279
 280 int isis_distribute_list_update(int routetype)
 281 {
 282         return 0;
 283 }
 284
 285 void isis_zebra_redistribute_set(afi_t afi, int type)
 286 {
 287         if (type == DEFAULT_ROUTE)
 288                 zclient_redistribute_default(ZEBRA_REDISTRIBUTE_DEFAULT_ADD,
 289                                              zclient, afi, VRF_DEFAULT);
 290         else
 291                 zclient_redistribute(ZEBRA_REDISTRIBUTE_ADD, zclient, afi, type,
 292                                      0, VRF_DEFAULT);
 293 }
 294
 295 void isis_zebra_redistribute_unset(afi_t afi, int type)
 296 {
 297         if (type == DEFAULT_ROUTE)
 298                 zclient_redistribute_default(ZEBRA_REDISTRIBUTE_DEFAULT_DELETE,
 299                                              zclient, afi, VRF_DEFAULT);
 300         else
 301                 zclient_redistribute(ZEBRA_REDISTRIBUTE_DELETE, zclient, afi,
 302                                      type, 0, VRF_DEFAULT);
 303 }
 304
 305 static void isis_zebra_connected(struct zclient *zclient)
 306 {
 307         zclient_send_reg_requests(zclient, VRF_DEFAULT);
 308 }
 309
 310 void isis_zebra_init(struct thread_master *master)
 311 {
 312         zclient = zclient_new(master, &zclient_options_default);
 313         zclient_init(zclient, PROTO_TYPE, 0, &isisd_privs);
 314         zclient->zebra_connected = isis_zebra_connected;
 315         zclient->router_id_update = isis_router_id_update_zebra;
 316         zclient->interface_address_add = isis_zebra_if_address_add;
 317         zclient->interface_address_delete = isis_zebra_if_address_del;
 318         zclient->interface_link_params = isis_zebra_link_params;
 319         zclient->redistribute_route_add = isis_zebra_read;
 320         zclient->redistribute_route_del = isis_zebra_read;
 321
 322         return;
 323 }
 324
 325 void isis_zebra_stop(void)
 326 {
 327         zclient_stop(zclient);
 328         zclient_free(zclient);
 329         frr_fini();
 330 }