eigrpd/eigrp_zebra.c

   1 /*
   2  * Zebra connect library for EIGRP.
   3  * Copyright (C) 2013-2014
   4  * Authors:
   5  *   Donnie Savage
   6  *   Jan Janovic
   7  *   Matej Perina
   8  *   Peter Orsag
   9  *   Peter Paluch
  10  *
  11  * This file is part of GNU Zebra.
  12  *
  13  * GNU Zebra is free software; you can redistribute it and/or modify it
  14  * under the terms of the GNU General Public License as published by the
  15  * Free Software Foundation; either version 2, or (at your option) any
  16  * later version.
  17  *
  18  * GNU Zebra is distributed in the hope that it will be useful, but
  19  * WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21  * General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License along
  24  * with this program; see the file COPYING; if not, write to the Free Software
  25  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  26  */
  27
  28 #include <zebra.h>
  29
  30 #include "thread.h"
  31 #include "command.h"
  32 #include "network.h"
  33 #include "prefix.h"
  34 #include "routemap.h"
  35 #include "table.h"
  36 #include "stream.h"
  37 #include "memory.h"
  38 #include "zclient.h"
  39 #include "filter.h"
  40 #include "plist.h"
  41 #include "log.h"
  42 #include "nexthop.h"
  43
  44 #include "eigrpd/eigrp_types.h"
  45 #include "eigrpd/eigrp_structs.h"
  46 #include "eigrpd/eigrpd.h"
  47 #include "eigrpd/eigrp_interface.h"
  48 #include "eigrpd/eigrp_neighbor.h"
  49 #include "eigrpd/eigrp_packet.h"
  50 #include "eigrpd/eigrp_zebra.h"
  51 #include "eigrpd/eigrp_vty.h"
  52 #include "eigrpd/eigrp_dump.h"
  53 #include "eigrpd/eigrp_network.h"
  54 #include "eigrpd/eigrp_topology.h"
  55 #include "eigrpd/eigrp_fsm.h"
  56 #include "eigrpd/eigrp_metric.h"
  57
  58 static int eigrp_interface_address_add(ZAPI_CALLBACK_ARGS);
  59 static int eigrp_interface_address_delete(ZAPI_CALLBACK_ARGS);
  60
  61 static int eigrp_zebra_read_route(ZAPI_CALLBACK_ARGS);
  62
  63 /* Zebra structure to hold current status. */
  64 struct zclient *zclient = NULL;
  65
  66 /* For registering threads. */
  67 extern struct thread_master *master;
  68 struct in_addr router_id_zebra;
  69
  70 /* Router-id update message from zebra. */
  71 static int eigrp_router_id_update_zebra(ZAPI_CALLBACK_ARGS)
  72 {
  73         struct eigrp *eigrp;
  74         struct prefix router_id;
  75         zebra_router_id_update_read(zclient->ibuf, &router_id);
  76
  77         router_id_zebra = router_id.u.prefix4;
  78
  79         eigrp = eigrp_lookup(vrf_id);
  80
  81         if (eigrp != NULL)
  82                 eigrp_router_id_update(eigrp);
  83
  84         return 0;
  85 }
  86
  87 static int eigrp_zebra_route_notify_owner(ZAPI_CALLBACK_ARGS)
  88 {
  89         struct prefix p;
  90         enum zapi_route_notify_owner note;
  91         uint32_t table;
  92
  93         if (!zapi_route_notify_decode(zclient->ibuf, &p, &table, &note, NULL,
  94                                       NULL))
  95                 return -1;
  96
  97         return 0;
  98 }
  99
 100 static void eigrp_zebra_connected(struct zclient *zclient)
 101 {
 102         zclient_send_reg_requests(zclient, VRF_DEFAULT);
 103 }
 104
 105 static zclient_handler *const eigrp_handlers[] = {
 106         [ZEBRA_ROUTER_ID_UPDATE] = eigrp_router_id_update_zebra,
 107         [ZEBRA_INTERFACE_ADDRESS_ADD] = eigrp_interface_address_add,
 108         [ZEBRA_INTERFACE_ADDRESS_DELETE] = eigrp_interface_address_delete,
 109         [ZEBRA_REDISTRIBUTE_ROUTE_ADD] = eigrp_zebra_read_route,
 110         [ZEBRA_REDISTRIBUTE_ROUTE_DEL] = eigrp_zebra_read_route,
 111         [ZEBRA_ROUTE_NOTIFY_OWNER] = eigrp_zebra_route_notify_owner,
 112 };
 113
 114 void eigrp_zebra_init(void)
 115 {
 116         struct zclient_options opt = {.receive_notify = false};
 117
 118         zclient = zclient_new(master, &opt, eigrp_handlers,
 119                               array_size(eigrp_handlers));
 120
 121         zclient_init(zclient, ZEBRA_ROUTE_EIGRP, 0, &eigrpd_privs);
 122         zclient->zebra_connected = eigrp_zebra_connected;
 123 }
 124
 125
 126 /* Zebra route add and delete treatment. */
 127 static int eigrp_zebra_read_route(ZAPI_CALLBACK_ARGS)
 128 {
 129         struct zapi_route api;
 130         struct eigrp *eigrp;
 131
 132         if (zapi_route_decode(zclient->ibuf, &api) < 0)
 133                 return -1;
 134
 135         if (IPV4_NET127(ntohl(api.prefix.u.prefix4.s_addr)))
 136                 return 0;
 137
 138         eigrp = eigrp_lookup(vrf_id);
 139         if (eigrp == NULL)
 140                 return 0;
 141
 142         if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD) {
 143
 144         } else /* if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_DEL) */
 145         {
 146         }
 147
 148         return 0;
 149 }
 150
 151 static int eigrp_interface_address_add(ZAPI_CALLBACK_ARGS)
 152 {
 153         struct connected *c;
 154
 155         c = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id);
 156
 157         if (c == NULL)
 158                 return 0;
 159
 160         if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE))
 161                 zlog_debug("Zebra: interface %s address add %pFX", c->ifp->name,
 162                            c->address);
 163
 164         eigrp_if_update(c->ifp);
 165
 166         return 0;
 167 }
 168
 169 static int eigrp_interface_address_delete(ZAPI_CALLBACK_ARGS)
 170 {
 171         struct connected *c;
 172         struct interface *ifp;
 173         struct eigrp_interface *ei;
 174
 175         c = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id);
 176
 177         if (c == NULL)
 178                 return 0;
 179
 180         if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE))
 181                 zlog_debug("Zebra: interface %s address delete %pFX",
 182                            c->ifp->name, c->address);
 183
 184         ifp = c->ifp;
 185         ei = ifp->info;
 186         if (!ei)
 187                 return 0;
 188
 189         /* Call interface hook functions to clean up */
 190         if (prefix_cmp(&ei->address, c->address) == 0)
 191                 eigrp_if_free(ei, INTERFACE_DOWN_BY_ZEBRA);
 192
 193         connected_free(&c);
 194
 195         return 0;
 196 }
 197
 198 void eigrp_zebra_route_add(struct eigrp *eigrp, struct prefix *p,
 199                            struct list *successors, uint32_t distance)
 200 {
 201         struct zapi_route api;
 202         struct zapi_nexthop *api_nh;
 203         struct eigrp_route_descriptor *te;
 204         struct listnode *node;
 205         int count = 0;
 206
 207         if (!zclient->redist[AFI_IP][ZEBRA_ROUTE_EIGRP])
 208                 return;
 209
 210         memset(&api, 0, sizeof(api));
 211         api.vrf_id = eigrp->vrf_id;
 212         api.type = ZEBRA_ROUTE_EIGRP;
 213         api.safi = SAFI_UNICAST;
 214         api.metric = distance;
 215         memcpy(&api.prefix, p, sizeof(*p));
 216
 217         SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
 218         SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
 219
 220         /* Nexthop, ifindex, distance and metric information. */
 221         for (ALL_LIST_ELEMENTS_RO(successors, node, te)) {
 222                 if (count >= MULTIPATH_NUM)
 223                         break;
 224                 api_nh = &api.nexthops[count];
 225                 api_nh->vrf_id = eigrp->vrf_id;
 226                 if (te->adv_router->src.s_addr) {
 227                         api_nh->gate.ipv4 = te->adv_router->src;
 228                         api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
 229                 } else
 230                         api_nh->type = NEXTHOP_TYPE_IFINDEX;
 231                 api_nh->ifindex = te->ei->ifp->ifindex;
 232
 233                 count++;
 234         }
 235         api.nexthop_num = count;
 236
 237         if (IS_DEBUG_EIGRP(zebra, ZEBRA_REDISTRIBUTE)) {
 238                 zlog_debug("Zebra: Route add %pFX", p);
 239         }
 240
 241         zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api);
 242 }
 243
 244 void eigrp_zebra_route_delete(struct eigrp *eigrp, struct prefix *p)
 245 {
 246         struct zapi_route api;
 247
 248         if (!zclient->redist[AFI_IP][ZEBRA_ROUTE_EIGRP])
 249                 return;
 250
 251         memset(&api, 0, sizeof(api));
 252         api.vrf_id = eigrp->vrf_id;
 253         api.type = ZEBRA_ROUTE_EIGRP;
 254         api.safi = SAFI_UNICAST;
 255         memcpy(&api.prefix, p, sizeof(*p));
 256         zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
 257
 258         if (IS_DEBUG_EIGRP(zebra, ZEBRA_REDISTRIBUTE))
 259                 zlog_debug("Zebra: Route del %pFX", p);
 260
 261         return;
 262 }
 263
 264 static int eigrp_is_type_redistributed(int type, vrf_id_t vrf_id)
 265 {
 266         return ((DEFAULT_ROUTE_TYPE(type))
 267                         ? vrf_bitmap_check(zclient->default_information[AFI_IP],
 268                                            vrf_id)
 269                         : vrf_bitmap_check(zclient->redist[AFI_IP][type],
 270                                            vrf_id));
 271 }
 272
 273 int eigrp_redistribute_set(struct eigrp *eigrp, int type,
 274                            struct eigrp_metrics metric)
 275 {
 276
 277         if (eigrp_is_type_redistributed(type, eigrp->vrf_id)) {
 278                 if (eigrp_metrics_is_same(metric, eigrp->dmetric[type])) {
 279                         eigrp->dmetric[type] = metric;
 280                 }
 281
 282                 eigrp_external_routes_refresh(eigrp, type);
 283
 284                 //      if (IS_DEBUG_EIGRP(zebra, ZEBRA_REDISTRIBUTE))
 285                 //        zlog_debug ("Redistribute[%s]: Refresh  Type[%d],
 286                 //        Metric[%d]",
 287                 //                   eigrp_redist_string(type),
 288                 //                   metric_type (eigrp, type), metric_value
 289                 //                   (eigrp, type));
 290                 return CMD_SUCCESS;
 291         }
 292
 293         eigrp->dmetric[type] = metric;
 294
 295         zclient_redistribute(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP, type, 0,
 296                              eigrp->vrf_id);
 297
 298         ++eigrp->redistribute;
 299
 300         return CMD_SUCCESS;
 301 }
 302
 303 int eigrp_redistribute_unset(struct eigrp *eigrp, int type)
 304 {
 305
 306         if (eigrp_is_type_redistributed(type, eigrp->vrf_id)) {
 307                 memset(&eigrp->dmetric[type], 0, sizeof(struct eigrp_metrics));
 308                 zclient_redistribute(ZEBRA_REDISTRIBUTE_DELETE, zclient, AFI_IP,
 309                                      type, 0, eigrp->vrf_id);
 310                 --eigrp->redistribute;
 311         }
 312
 313         return CMD_SUCCESS;
 314 }