eigrpd/eigrp_zebra.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Zebra connect library for EIGRP.
   4  * Copyright (C) 2013-2014
   5  * Authors:
   6  *   Donnie Savage
   7  *   Jan Janovic
   8  *   Matej Perina
   9  *   Peter Orsag
  10  *   Peter Paluch
  11  */
  12
  13 #include <zebra.h>
  14
  15 #include "frrevent.h"
  16 #include "command.h"
  17 #include "network.h"
  18 #include "prefix.h"
  19 #include "routemap.h"
  20 #include "table.h"
  21 #include "stream.h"
  22 #include "memory.h"
  23 #include "zclient.h"
  24 #include "filter.h"
  25 #include "plist.h"
  26 #include "log.h"
  27 #include "nexthop.h"
  28
  29 #include "eigrpd/eigrp_types.h"
  30 #include "eigrpd/eigrp_structs.h"
  31 #include "eigrpd/eigrpd.h"
  32 #include "eigrpd/eigrp_interface.h"
  33 #include "eigrpd/eigrp_neighbor.h"
  34 #include "eigrpd/eigrp_packet.h"
  35 #include "eigrpd/eigrp_zebra.h"
  36 #include "eigrpd/eigrp_vty.h"
  37 #include "eigrpd/eigrp_dump.h"
  38 #include "eigrpd/eigrp_network.h"
  39 #include "eigrpd/eigrp_topology.h"
  40 #include "eigrpd/eigrp_fsm.h"
  41 #include "eigrpd/eigrp_metric.h"
  42
  43 static int eigrp_interface_address_add(ZAPI_CALLBACK_ARGS);
  44 static int eigrp_interface_address_delete(ZAPI_CALLBACK_ARGS);
  45
  46 static int eigrp_zebra_read_route(ZAPI_CALLBACK_ARGS);
  47
  48 /* Zebra structure to hold current status. */
  49 struct zclient *zclient = NULL;
  50
  51 /* For registering threads. */
  52 extern struct event_loop *master;
  53 struct in_addr router_id_zebra;
  54
  55 /* Router-id update message from zebra. */
  56 static int eigrp_router_id_update_zebra(ZAPI_CALLBACK_ARGS)
  57 {
  58         struct eigrp *eigrp;
  59         struct prefix router_id;
  60         zebra_router_id_update_read(zclient->ibuf, &router_id);
  61
  62         router_id_zebra = router_id.u.prefix4;
  63
  64         eigrp = eigrp_lookup(vrf_id);
  65
  66         if (eigrp != NULL)
  67                 eigrp_router_id_update(eigrp);
  68
  69         return 0;
  70 }
  71
  72 static int eigrp_zebra_route_notify_owner(ZAPI_CALLBACK_ARGS)
  73 {
  74         struct prefix p;
  75         enum zapi_route_notify_owner note;
  76         uint32_t table;
  77
  78         if (!zapi_route_notify_decode(zclient->ibuf, &p, &table, &note, NULL,
  79                                       NULL))
  80                 return -1;
  81
  82         return 0;
  83 }
  84
  85 static void eigrp_zebra_connected(struct zclient *zclient)
  86 {
  87         zclient_send_reg_requests(zclient, VRF_DEFAULT);
  88 }
  89
  90 static zclient_handler *const eigrp_handlers[] = {
  91         [ZEBRA_ROUTER_ID_UPDATE] = eigrp_router_id_update_zebra,
  92         [ZEBRA_INTERFACE_ADDRESS_ADD] = eigrp_interface_address_add,
  93         [ZEBRA_INTERFACE_ADDRESS_DELETE] = eigrp_interface_address_delete,
  94         [ZEBRA_REDISTRIBUTE_ROUTE_ADD] = eigrp_zebra_read_route,
  95         [ZEBRA_REDISTRIBUTE_ROUTE_DEL] = eigrp_zebra_read_route,
  96         [ZEBRA_ROUTE_NOTIFY_OWNER] = eigrp_zebra_route_notify_owner,
  97 };
  98
  99 void eigrp_zebra_init(void)
 100 {
 101         struct zclient_options opt = {.receive_notify = false};
 102
 103         zclient = zclient_new(master, &opt, eigrp_handlers,
 104                               array_size(eigrp_handlers));
 105
 106         zclient_init(zclient, ZEBRA_ROUTE_EIGRP, 0, &eigrpd_privs);
 107         zclient->zebra_connected = eigrp_zebra_connected;
 108 }
 109
 110
 111 /* Zebra route add and delete treatment. */
 112 static int eigrp_zebra_read_route(ZAPI_CALLBACK_ARGS)
 113 {
 114         struct zapi_route api;
 115         struct eigrp *eigrp;
 116
 117         if (zapi_route_decode(zclient->ibuf, &api) < 0)
 118                 return -1;
 119
 120         if (IPV4_NET127(ntohl(api.prefix.u.prefix4.s_addr)))
 121                 return 0;
 122
 123         eigrp = eigrp_lookup(vrf_id);
 124         if (eigrp == NULL)
 125                 return 0;
 126
 127         if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD) {
 128
 129         } else /* if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_DEL) */
 130         {
 131         }
 132
 133         return 0;
 134 }
 135
 136 static int eigrp_interface_address_add(ZAPI_CALLBACK_ARGS)
 137 {
 138         struct connected *c;
 139
 140         c = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id);
 141
 142         if (c == NULL)
 143                 return 0;
 144
 145         if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE))
 146                 zlog_debug("Zebra: interface %s address add %pFX", c->ifp->name,
 147                            c->address);
 148
 149         eigrp_if_update(c->ifp);
 150
 151         return 0;
 152 }
 153
 154 static int eigrp_interface_address_delete(ZAPI_CALLBACK_ARGS)
 155 {
 156         struct connected *c;
 157         struct interface *ifp;
 158         struct eigrp_interface *ei;
 159
 160         c = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id);
 161
 162         if (c == NULL)
 163                 return 0;
 164
 165         if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE))
 166                 zlog_debug("Zebra: interface %s address delete %pFX",
 167                            c->ifp->name, c->address);
 168
 169         ifp = c->ifp;
 170         ei = ifp->info;
 171         if (!ei)
 172                 return 0;
 173
 174         /* Call interface hook functions to clean up */
 175         if (prefix_cmp(&ei->address, c->address) == 0)
 176                 eigrp_if_free(ei, INTERFACE_DOWN_BY_ZEBRA);
 177
 178         connected_free(&c);
 179
 180         return 0;
 181 }
 182
 183 void eigrp_zebra_route_add(struct eigrp *eigrp, struct prefix *p,
 184                            struct list *successors, uint32_t distance)
 185 {
 186         struct zapi_route api;
 187         struct zapi_nexthop *api_nh;
 188         struct eigrp_route_descriptor *te;
 189         struct listnode *node;
 190         int count = 0;
 191
 192         if (!zclient->redist[AFI_IP][ZEBRA_ROUTE_EIGRP])
 193                 return;
 194
 195         memset(&api, 0, sizeof(api));
 196         api.vrf_id = eigrp->vrf_id;
 197         api.type = ZEBRA_ROUTE_EIGRP;
 198         api.safi = SAFI_UNICAST;
 199         api.metric = distance;
 200         memcpy(&api.prefix, p, sizeof(*p));
 201
 202         SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
 203         SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
 204
 205         /* Nexthop, ifindex, distance and metric information. */
 206         for (ALL_LIST_ELEMENTS_RO(successors, node, te)) {
 207                 if (count >= MULTIPATH_NUM)
 208                         break;
 209                 api_nh = &api.nexthops[count];
 210                 api_nh->vrf_id = eigrp->vrf_id;
 211                 if (te->adv_router->src.s_addr) {
 212                         api_nh->gate.ipv4 = te->adv_router->src;
 213                         api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
 214                 } else
 215                         api_nh->type = NEXTHOP_TYPE_IFINDEX;
 216                 api_nh->ifindex = te->ei->ifp->ifindex;
 217
 218                 count++;
 219         }
 220         api.nexthop_num = count;
 221
 222         if (IS_DEBUG_EIGRP(zebra, ZEBRA_REDISTRIBUTE)) {
 223                 zlog_debug("Zebra: Route add %pFX", p);
 224         }
 225
 226         zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api);
 227 }
 228
 229 void eigrp_zebra_route_delete(struct eigrp *eigrp, struct prefix *p)
 230 {
 231         struct zapi_route api;
 232
 233         if (!zclient->redist[AFI_IP][ZEBRA_ROUTE_EIGRP])
 234                 return;
 235
 236         memset(&api, 0, sizeof(api));
 237         api.vrf_id = eigrp->vrf_id;
 238         api.type = ZEBRA_ROUTE_EIGRP;
 239         api.safi = SAFI_UNICAST;
 240         memcpy(&api.prefix, p, sizeof(*p));
 241         zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
 242
 243         if (IS_DEBUG_EIGRP(zebra, ZEBRA_REDISTRIBUTE))
 244                 zlog_debug("Zebra: Route del %pFX", p);
 245
 246         return;
 247 }
 248
 249 static int eigrp_is_type_redistributed(int type, vrf_id_t vrf_id)
 250 {
 251         return ((DEFAULT_ROUTE_TYPE(type))
 252                         ? vrf_bitmap_check(zclient->default_information[AFI_IP],
 253                                            vrf_id)
 254                         : vrf_bitmap_check(zclient->redist[AFI_IP][type],
 255                                            vrf_id));
 256 }
 257
 258 int eigrp_redistribute_set(struct eigrp *eigrp, int type,
 259                            struct eigrp_metrics metric)
 260 {
 261
 262         if (eigrp_is_type_redistributed(type, eigrp->vrf_id)) {
 263                 if (eigrp_metrics_is_same(metric, eigrp->dmetric[type])) {
 264                         eigrp->dmetric[type] = metric;
 265                 }
 266
 267                 eigrp_external_routes_refresh(eigrp, type);
 268
 269                 //      if (IS_DEBUG_EIGRP(zebra, ZEBRA_REDISTRIBUTE))
 270                 //        zlog_debug ("Redistribute[%s]: Refresh  Type[%d],
 271                 //        Metric[%d]",
 272                 //                   eigrp_redist_string(type),
 273                 //                   metric_type (eigrp, type), metric_value
 274                 //                   (eigrp, type));
 275                 return CMD_SUCCESS;
 276         }
 277
 278         eigrp->dmetric[type] = metric;
 279
 280         zclient_redistribute(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP, type, 0,
 281                              eigrp->vrf_id);
 282
 283         ++eigrp->redistribute;
 284
 285         return CMD_SUCCESS;
 286 }
 287
 288 int eigrp_redistribute_unset(struct eigrp *eigrp, int type)
 289 {
 290
 291         if (eigrp_is_type_redistributed(type, eigrp->vrf_id)) {
 292                 memset(&eigrp->dmetric[type], 0, sizeof(struct eigrp_metrics));
 293                 zclient_redistribute(ZEBRA_REDISTRIBUTE_DELETE, zclient, AFI_IP,
 294                                      type, 0, eigrp->vrf_id);
 295                 --eigrp->redistribute;
 296         }
 297
 298         return CMD_SUCCESS;
 299 }