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_structs.h"
  45 #include "eigrpd/eigrpd.h"
  46 #include "eigrpd/eigrp_interface.h"
  47 #include "eigrpd/eigrp_neighbor.h"
  48 #include "eigrpd/eigrp_packet.h"
  49 #include "eigrpd/eigrp_zebra.h"
  50 #include "eigrpd/eigrp_vty.h"
  51 #include "eigrpd/eigrp_dump.h"
  52 #include "eigrpd/eigrp_network.h"
  53 #include "eigrpd/eigrp_topology.h"
  54 #include "eigrpd/eigrp_fsm.h"
  55
  56 static int eigrp_interface_address_add(ZAPI_CALLBACK_ARGS);
  57 static int eigrp_interface_address_delete(ZAPI_CALLBACK_ARGS);
  58
  59 static int eigrp_zebra_read_route(ZAPI_CALLBACK_ARGS);
  60
  61 /* Zebra structure to hold current status. */
  62 struct zclient *zclient = NULL;
  63
  64 /* For registering threads. */
  65 extern struct thread_master *master;
  66 struct in_addr router_id_zebra;
  67
  68 /* Router-id update message from zebra. */
  69 static int eigrp_router_id_update_zebra(ZAPI_CALLBACK_ARGS)
  70 {
  71         struct eigrp *eigrp;
  72         struct prefix router_id;
  73         zebra_router_id_update_read(zclient->ibuf, &router_id);
  74
  75         router_id_zebra = router_id.u.prefix4;
  76
  77         eigrp = eigrp_lookup(vrf_id);
  78
  79         if (eigrp != NULL)
  80                 eigrp_router_id_update(eigrp);
  81
  82         return 0;
  83 }
  84
  85 static int eigrp_zebra_route_notify_owner(ZAPI_CALLBACK_ARGS)
  86 {
  87         struct prefix p;
  88         enum zapi_route_notify_owner note;
  89         uint32_t table;
  90
  91         if (!zapi_route_notify_decode(zclient->ibuf, &p, &table, &note, NULL,
  92                                       NULL))
  93                 return -1;
  94
  95         return 0;
  96 }
  97
  98 static void eigrp_zebra_connected(struct zclient *zclient)
  99 {
 100         zclient_send_reg_requests(zclient, VRF_DEFAULT);
 101 }
 102
 103 void eigrp_zebra_init(void)
 104 {
 105         struct zclient_options opt = {.receive_notify = false};
 106
 107         zclient = zclient_new(master, &opt);
 108
 109         zclient_init(zclient, ZEBRA_ROUTE_EIGRP, 0, &eigrpd_privs);
 110         zclient->zebra_connected = eigrp_zebra_connected;
 111         zclient->router_id_update = eigrp_router_id_update_zebra;
 112         zclient->interface_address_add = eigrp_interface_address_add;
 113         zclient->interface_address_delete = eigrp_interface_address_delete;
 114         zclient->redistribute_route_add = eigrp_zebra_read_route;
 115         zclient->redistribute_route_del = eigrp_zebra_read_route;
 116         zclient->route_notify_owner = eigrp_zebra_route_notify_owner;
 117 }
 118
 119
 120 /* Zebra route add and delete treatment. */
 121 static int eigrp_zebra_read_route(ZAPI_CALLBACK_ARGS)
 122 {
 123         struct zapi_route api;
 124         struct eigrp *eigrp;
 125
 126         if (zapi_route_decode(zclient->ibuf, &api) < 0)
 127                 return -1;
 128
 129         if (IPV4_NET127(ntohl(api.prefix.u.prefix4.s_addr)))
 130                 return 0;
 131
 132         eigrp = eigrp_lookup(vrf_id);
 133         if (eigrp == NULL)
 134                 return 0;
 135
 136         if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD) {
 137
 138         } else /* if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_DEL) */
 139         {
 140         }
 141
 142         return 0;
 143 }
 144
 145 static int eigrp_interface_address_add(ZAPI_CALLBACK_ARGS)
 146 {
 147         struct connected *c;
 148
 149         c = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id);
 150
 151         if (c == NULL)
 152                 return 0;
 153
 154         if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE))
 155                 zlog_debug("Zebra: interface %s address add %pFX", c->ifp->name,
 156                            c->address);
 157
 158         eigrp_if_update(c->ifp);
 159
 160         return 0;
 161 }
 162
 163 static int eigrp_interface_address_delete(ZAPI_CALLBACK_ARGS)
 164 {
 165         struct connected *c;
 166         struct interface *ifp;
 167         struct eigrp_interface *ei;
 168
 169         c = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id);
 170
 171         if (c == NULL)
 172                 return 0;
 173
 174         if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE))
 175                 zlog_debug("Zebra: interface %s address delete %pFX",
 176                            c->ifp->name, c->address);
 177
 178         ifp = c->ifp;
 179         ei = ifp->info;
 180         if (!ei)
 181                 return 0;
 182
 183         /* Call interface hook functions to clean up */
 184         if (prefix_cmp(&ei->address, c->address) == 0)
 185                 eigrp_if_free(ei, INTERFACE_DOWN_BY_ZEBRA);
 186
 187         connected_free(&c);
 188
 189         return 0;
 190 }
 191
 192 void eigrp_zebra_route_add(struct eigrp *eigrp, struct prefix *p,
 193                            struct list *successors, uint32_t distance)
 194 {
 195         struct zapi_route api;
 196         struct zapi_nexthop *api_nh;
 197         struct eigrp_nexthop_entry *te;
 198         struct listnode *node;
 199         int count = 0;
 200
 201         if (!zclient->redist[AFI_IP][ZEBRA_ROUTE_EIGRP])
 202                 return;
 203
 204         memset(&api, 0, sizeof(api));
 205         api.vrf_id = eigrp->vrf_id;
 206         api.type = ZEBRA_ROUTE_EIGRP;
 207         api.safi = SAFI_UNICAST;
 208         api.metric = distance;
 209         memcpy(&api.prefix, p, sizeof(*p));
 210
 211         SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
 212         SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
 213
 214         /* Nexthop, ifindex, distance and metric information. */
 215         for (ALL_LIST_ELEMENTS_RO(successors, node, te)) {
 216                 if (count >= MULTIPATH_NUM)
 217                         break;
 218                 api_nh = &api.nexthops[count];
 219                 api_nh->vrf_id = eigrp->vrf_id;
 220                 if (te->adv_router->src.s_addr) {
 221                         api_nh->gate.ipv4 = te->adv_router->src;
 222                         api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
 223                 } else
 224                         api_nh->type = NEXTHOP_TYPE_IFINDEX;
 225                 api_nh->ifindex = te->ei->ifp->ifindex;
 226
 227                 count++;
 228         }
 229         api.nexthop_num = count;
 230
 231         if (IS_DEBUG_EIGRP(zebra, ZEBRA_REDISTRIBUTE)) {
 232                 char buf[PREFIX_STRLEN];
 233                 zlog_debug("Zebra: Route add %pFX nexthop %s", p,
 234                            inet_ntop(AF_INET, 0, buf, PREFIX_STRLEN));
 235         }
 236
 237         zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api);
 238 }
 239
 240 void eigrp_zebra_route_delete(struct eigrp *eigrp, struct prefix *p)
 241 {
 242         struct zapi_route api;
 243
 244         if (!zclient->redist[AFI_IP][ZEBRA_ROUTE_EIGRP])
 245                 return;
 246
 247         memset(&api, 0, sizeof(api));
 248         api.vrf_id = eigrp->vrf_id;
 249         api.type = ZEBRA_ROUTE_EIGRP;
 250         api.safi = SAFI_UNICAST;
 251         memcpy(&api.prefix, p, sizeof(*p));
 252         zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
 253
 254         if (IS_DEBUG_EIGRP(zebra, ZEBRA_REDISTRIBUTE))
 255                 zlog_debug("Zebra: Route del %pFX", p);
 256
 257         return;
 258 }
 259
 260 static int eigrp_is_type_redistributed(int type, vrf_id_t vrf_id)
 261 {
 262         return ((DEFAULT_ROUTE_TYPE(type))
 263                         ? vrf_bitmap_check(zclient->default_information[AFI_IP],
 264                                            vrf_id)
 265                         : vrf_bitmap_check(zclient->redist[AFI_IP][type],
 266                                            vrf_id));
 267 }
 268
 269 int eigrp_redistribute_set(struct eigrp *eigrp, int type,
 270                            struct eigrp_metrics metric)
 271 {
 272
 273         if (eigrp_is_type_redistributed(type, eigrp->vrf_id)) {
 274                 if (eigrp_metrics_is_same(metric, eigrp->dmetric[type])) {
 275                         eigrp->dmetric[type] = metric;
 276                 }
 277
 278                 eigrp_external_routes_refresh(eigrp, type);
 279
 280                 //      if (IS_DEBUG_EIGRP(zebra, ZEBRA_REDISTRIBUTE))
 281                 //        zlog_debug ("Redistribute[%s]: Refresh  Type[%d],
 282                 //        Metric[%d]",
 283                 //                   eigrp_redist_string(type),
 284                 //                   metric_type (eigrp, type), metric_value
 285                 //                   (eigrp, type));
 286                 return CMD_SUCCESS;
 287         }
 288
 289         eigrp->dmetric[type] = metric;
 290
 291         zclient_redistribute(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP, type, 0,
 292                              eigrp->vrf_id);
 293
 294         ++eigrp->redistribute;
 295
 296         return CMD_SUCCESS;
 297 }
 298
 299 int eigrp_redistribute_unset(struct eigrp *eigrp, int type)
 300 {
 301
 302         if (eigrp_is_type_redistributed(type, eigrp->vrf_id)) {
 303                 memset(&eigrp->dmetric[type], 0, sizeof(struct eigrp_metrics));
 304                 zclient_redistribute(ZEBRA_REDISTRIBUTE_DELETE, zclient, AFI_IP,
 305                                      type, 0, eigrp->vrf_id);
 306                 --eigrp->redistribute;
 307         }
 308
 309         return CMD_SUCCESS;
 310 }