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))
  92                 return -1;
  93
  94         return 0;
  95 }
  96
  97 static void eigrp_zebra_connected(struct zclient *zclient)
  98 {
  99         zclient_send_reg_requests(zclient, VRF_DEFAULT);
 100 }
 101
 102 void eigrp_zebra_init(void)
 103 {
 104         struct zclient_options opt = {.receive_notify = false};
 105
 106         zclient = zclient_new(master, &opt);
 107
 108         zclient_init(zclient, ZEBRA_ROUTE_EIGRP, 0, &eigrpd_privs);
 109         zclient->zebra_connected = eigrp_zebra_connected;
 110         zclient->router_id_update = eigrp_router_id_update_zebra;
 111         zclient->interface_address_add = eigrp_interface_address_add;
 112         zclient->interface_address_delete = eigrp_interface_address_delete;
 113         zclient->redistribute_route_add = eigrp_zebra_read_route;
 114         zclient->redistribute_route_del = eigrp_zebra_read_route;
 115         zclient->route_notify_owner = eigrp_zebra_route_notify_owner;
 116 }
 117
 118
 119 /* Zebra route add and delete treatment. */
 120 static int eigrp_zebra_read_route(ZAPI_CALLBACK_ARGS)
 121 {
 122         struct zapi_route api;
 123         struct eigrp *eigrp;
 124
 125         if (zapi_route_decode(zclient->ibuf, &api) < 0)
 126                 return -1;
 127
 128         if (IPV4_NET127(ntohl(api.prefix.u.prefix4.s_addr)))
 129                 return 0;
 130
 131         eigrp = eigrp_lookup(vrf_id);
 132         if (eigrp == NULL)
 133                 return 0;
 134
 135         if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD) {
 136
 137         } else /* if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_DEL) */
 138         {
 139         }
 140
 141         return 0;
 142 }
 143
 144 static int eigrp_interface_address_add(ZAPI_CALLBACK_ARGS)
 145 {
 146         struct connected *c;
 147
 148         c = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id);
 149
 150         if (c == NULL)
 151                 return 0;
 152
 153         if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE)) {
 154                 char buf[128];
 155                 prefix2str(c->address, buf, sizeof(buf));
 156                 zlog_debug("Zebra: interface %s address add %s", c->ifp->name,
 157                            buf);
 158         }
 159
 160         eigrp_if_update(c->ifp);
 161
 162         return 0;
 163 }
 164
 165 static int eigrp_interface_address_delete(ZAPI_CALLBACK_ARGS)
 166 {
 167         struct connected *c;
 168         struct interface *ifp;
 169         struct eigrp_interface *ei;
 170
 171         c = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id);
 172
 173         if (c == NULL)
 174                 return 0;
 175
 176         if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE)) {
 177                 char buf[128];
 178                 prefix2str(c->address, buf, sizeof(buf));
 179                 zlog_debug("Zebra: interface %s address delete %s",
 180                            c->ifp->name, buf);
 181         }
 182
 183         ifp = c->ifp;
 184         ei = ifp->info;
 185         if (!ei)
 186                 return 0;
 187
 188         /* Call interface hook functions to clean up */
 189         if (prefix_cmp(&ei->address, c->address) == 0)
 190                 eigrp_if_free(ei, INTERFACE_DOWN_BY_ZEBRA);
 191
 192         connected_free(&c);
 193
 194         return 0;
 195 }
 196
 197 void eigrp_zebra_route_add(struct eigrp *eigrp, struct prefix *p,
 198                            struct list *successors, uint32_t distance)
 199 {
 200         struct zapi_route api;
 201         struct zapi_nexthop *api_nh;
 202         struct eigrp_nexthop_entry *te;
 203         struct listnode *node;
 204         int count = 0;
 205
 206         if (!zclient->redist[AFI_IP][ZEBRA_ROUTE_EIGRP])
 207                 return;
 208
 209         memset(&api, 0, sizeof(api));
 210         api.vrf_id = eigrp->vrf_id;
 211         api.type = ZEBRA_ROUTE_EIGRP;
 212         api.safi = SAFI_UNICAST;
 213         api.metric = distance;
 214         memcpy(&api.prefix, p, sizeof(*p));
 215
 216         SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
 217         SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
 218
 219         /* Nexthop, ifindex, distance and metric information. */
 220         for (ALL_LIST_ELEMENTS_RO(successors, node, te)) {
 221                 if (count >= MULTIPATH_NUM)
 222                         break;
 223                 api_nh = &api.nexthops[count];
 224                 api_nh->vrf_id = eigrp->vrf_id;
 225                 if (te->adv_router->src.s_addr) {
 226                         api_nh->gate.ipv4 = te->adv_router->src;
 227                         api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
 228                 } else
 229                         api_nh->type = NEXTHOP_TYPE_IFINDEX;
 230                 api_nh->ifindex = te->ei->ifp->ifindex;
 231
 232                 count++;
 233         }
 234         api.nexthop_num = count;
 235
 236         if (IS_DEBUG_EIGRP(zebra, ZEBRA_REDISTRIBUTE)) {
 237                 char buf[2][PREFIX_STRLEN];
 238                 zlog_debug("Zebra: Route add %s nexthop %s",
 239                            prefix2str(p, buf[0], PREFIX_STRLEN),
 240                            inet_ntop(AF_INET, 0, buf[1], PREFIX_STRLEN));
 241         }
 242
 243         zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api);
 244 }
 245
 246 void eigrp_zebra_route_delete(struct eigrp *eigrp, struct prefix *p)
 247 {
 248         struct zapi_route api;
 249
 250         if (!zclient->redist[AFI_IP][ZEBRA_ROUTE_EIGRP])
 251                 return;
 252
 253         memset(&api, 0, sizeof(api));
 254         api.vrf_id = eigrp->vrf_id;
 255         api.type = ZEBRA_ROUTE_EIGRP;
 256         api.safi = SAFI_UNICAST;
 257         memcpy(&api.prefix, p, sizeof(*p));
 258         zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
 259
 260         if (IS_DEBUG_EIGRP(zebra, ZEBRA_REDISTRIBUTE)) {
 261                 char buf[PREFIX_STRLEN];
 262                 zlog_debug("Zebra: Route del %s",
 263                            prefix2str(p, buf, PREFIX_STRLEN));
 264         }
 265
 266         return;
 267 }
 268
 269 static int eigrp_is_type_redistributed(int type, vrf_id_t vrf_id)
 270 {
 271         return ((DEFAULT_ROUTE_TYPE(type))
 272                         ? vrf_bitmap_check(zclient->default_information[AFI_IP],
 273                                            vrf_id)
 274                         : vrf_bitmap_check(zclient->redist[AFI_IP][type],
 275                                            vrf_id));
 276 }
 277
 278 int eigrp_redistribute_set(struct eigrp *eigrp, int type,
 279                            struct eigrp_metrics metric)
 280 {
 281
 282         if (eigrp_is_type_redistributed(type, eigrp->vrf_id)) {
 283                 if (eigrp_metrics_is_same(metric, eigrp->dmetric[type])) {
 284                         eigrp->dmetric[type] = metric;
 285                 }
 286
 287                 eigrp_external_routes_refresh(eigrp, type);
 288
 289                 //      if (IS_DEBUG_EIGRP(zebra, ZEBRA_REDISTRIBUTE))
 290                 //        zlog_debug ("Redistribute[%s]: Refresh  Type[%d],
 291                 //        Metric[%d]",
 292                 //                   eigrp_redist_string(type),
 293                 //                   metric_type (eigrp, type), metric_value
 294                 //                   (eigrp, type));
 295                 return CMD_SUCCESS;
 296         }
 297
 298         eigrp->dmetric[type] = metric;
 299
 300         zclient_redistribute(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP, type, 0,
 301                              eigrp->vrf_id);
 302
 303         ++eigrp->redistribute;
 304
 305         return CMD_SUCCESS;
 306 }
 307
 308 int eigrp_redistribute_unset(struct eigrp *eigrp, int type)
 309 {
 310
 311         if (eigrp_is_type_redistributed(type, eigrp->vrf_id)) {
 312                 memset(&eigrp->dmetric[type], 0, sizeof(struct eigrp_metrics));
 313                 zclient_redistribute(ZEBRA_REDISTRIBUTE_DELETE, zclient, AFI_IP,
 314                                      type, 0, eigrp->vrf_id);
 315                 --eigrp->redistribute;
 316         }
 317
 318         return CMD_SUCCESS;
 319 }