ripd/rip_zebra.c

   1 /* RIPd and zebra interface.
   2  * Copyright (C) 1997, 1999 Kunihiro Ishiguro <kunihiro@zebra.org>
   3  *
   4  * This file is part of GNU Zebra.
   5  *
   6  * GNU Zebra is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2, or (at your option) any
   9  * later version.
  10  *
  11  * GNU Zebra is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; see the file COPYING; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include <zebra.h>
  22
  23 #include "command.h"
  24 #include "prefix.h"
  25 #include "table.h"
  26 #include "stream.h"
  27 #include "memory.h"
  28 #include "zclient.h"
  29 #include "log.h"
  30 #include "vrf.h"
  31 #include "ripd/ripd.h"
  32 #include "ripd/rip_debug.h"
  33 #include "ripd/rip_interface.h"
  34
  35 /* All information about zebra. */
  36 struct zclient *zclient = NULL;
  37
  38 /* Send ECMP routes to zebra. */
  39 static void rip_zebra_ipv4_send(struct rip *rip, struct route_node *rp,
  40                                 uint8_t cmd)
  41 {
  42         struct list *list = (struct list *)rp->info;
  43         struct zapi_route api;
  44         struct zapi_nexthop *api_nh;
  45         struct listnode *listnode = NULL;
  46         struct rip_info *rinfo = NULL;
  47         int count = 0;
  48
  49         memset(&api, 0, sizeof(api));
  50         api.vrf_id = rip->vrf->vrf_id;
  51         api.type = ZEBRA_ROUTE_RIP;
  52         api.safi = SAFI_UNICAST;
  53
  54         SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
  55         for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) {
  56                 if (count >= MULTIPATH_NUM)
  57                         break;
  58                 api_nh = &api.nexthops[count];
  59                 api_nh->vrf_id = rip->vrf->vrf_id;
  60                 api_nh->gate = rinfo->nh.gate;
  61                 api_nh->type = NEXTHOP_TYPE_IPV4;
  62                 if (cmd == ZEBRA_ROUTE_ADD)
  63                         SET_FLAG(rinfo->flags, RIP_RTF_FIB);
  64                 else
  65                         UNSET_FLAG(rinfo->flags, RIP_RTF_FIB);
  66                 count++;
  67         }
  68
  69         api.prefix = rp->p;
  70         api.nexthop_num = count;
  71
  72         rinfo = listgetdata(listhead(list));
  73
  74         SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
  75         api.metric = rinfo->metric;
  76
  77         if (rinfo->distance && rinfo->distance != ZEBRA_RIP_DISTANCE_DEFAULT) {
  78                 SET_FLAG(api.message, ZAPI_MESSAGE_DISTANCE);
  79                 api.distance = rinfo->distance;
  80         }
  81
  82         if (rinfo->tag) {
  83                 SET_FLAG(api.message, ZAPI_MESSAGE_TAG);
  84                 api.tag = rinfo->tag;
  85         }
  86
  87         zclient_route_send(cmd, zclient, &api);
  88
  89         if (IS_RIP_DEBUG_ZEBRA) {
  90                 if (rip->ecmp)
  91                         zlog_debug("%s: %pFX nexthops %d",
  92                                    (cmd == ZEBRA_ROUTE_ADD)
  93                                            ? "Install into zebra"
  94                                            : "Delete from zebra",
  95                                    &rp->p, count);
  96                 else
  97                         zlog_debug("%s: %pFX",
  98                                    (cmd == ZEBRA_ROUTE_ADD)
  99                                            ? "Install into zebra"
 100                                            : "Delete from zebra", &rp->p);
 101         }
 102
 103         rip->counters.route_changes++;
 104 }
 105
 106 /* Add/update ECMP routes to zebra. */
 107 void rip_zebra_ipv4_add(struct rip *rip, struct route_node *rp)
 108 {
 109         rip_zebra_ipv4_send(rip, rp, ZEBRA_ROUTE_ADD);
 110 }
 111
 112 /* Delete ECMP routes from zebra. */
 113 void rip_zebra_ipv4_delete(struct rip *rip, struct route_node *rp)
 114 {
 115         rip_zebra_ipv4_send(rip, rp, ZEBRA_ROUTE_DELETE);
 116 }
 117
 118 /* Zebra route add and delete treatment. */
 119 static int rip_zebra_read_route(ZAPI_CALLBACK_ARGS)
 120 {
 121         struct rip *rip;
 122         struct zapi_route api;
 123         struct nexthop nh;
 124
 125         rip = rip_lookup_by_vrf_id(vrf_id);
 126         if (!rip)
 127                 return 0;
 128
 129         if (zapi_route_decode(zclient->ibuf, &api) < 0)
 130                 return -1;
 131
 132         memset(&nh, 0, sizeof(nh));
 133         nh.type = api.nexthops[0].type;
 134         nh.gate.ipv4 = api.nexthops[0].gate.ipv4;
 135         nh.ifindex = api.nexthops[0].ifindex;
 136
 137         /* Then fetch IPv4 prefixes. */
 138         if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD)
 139                 rip_redistribute_add(rip, api.type, RIP_ROUTE_REDISTRIBUTE,
 140                                      (struct prefix_ipv4 *)&api.prefix, &nh,
 141                                      api.metric, api.distance, api.tag);
 142         else if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_DEL)
 143                 rip_redistribute_delete(rip, api.type, RIP_ROUTE_REDISTRIBUTE,
 144                                         (struct prefix_ipv4 *)&api.prefix,
 145                                         nh.ifindex);
 146
 147         return 0;
 148 }
 149
 150 void rip_redistribute_conf_update(struct rip *rip, int type)
 151 {
 152         zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP,
 153                                 type, 0, rip->vrf->vrf_id);
 154 }
 155
 156 void rip_redistribute_conf_delete(struct rip *rip, int type)
 157 {
 158         if (zclient->sock > 0)
 159                 zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient,
 160                                         AFI_IP, type, 0, rip->vrf->vrf_id);
 161
 162         /* Remove the routes from RIP table. */
 163         rip_redistribute_withdraw(rip, type);
 164 }
 165
 166 int rip_redistribute_check(struct rip *rip, int type)
 167 {
 168         return rip->redist[type].enabled;
 169 }
 170
 171 void rip_redistribute_enable(struct rip *rip)
 172 {
 173         for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) {
 174                 if (!rip_redistribute_check(rip, i))
 175                         continue;
 176
 177                 zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP,
 178                                         i, 0, rip->vrf->vrf_id);
 179         }
 180 }
 181
 182 void rip_redistribute_disable(struct rip *rip)
 183 {
 184         for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) {
 185                 if (!rip_redistribute_check(rip, i))
 186                         continue;
 187
 188                 zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient,
 189                                         AFI_IP, i, 0, rip->vrf->vrf_id);
 190         }
 191 }
 192
 193 void rip_show_redistribute_config(struct vty *vty, struct rip *rip)
 194 {
 195         for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) {
 196                 if (i == zclient->redist_default
 197                     || !rip_redistribute_check(rip, i))
 198                         continue;
 199
 200                 vty_out(vty, " %s", zebra_route_string(i));
 201         }
 202 }
 203
 204 void rip_zebra_vrf_register(struct vrf *vrf)
 205 {
 206         if (vrf->vrf_id == VRF_DEFAULT)
 207                 return;
 208
 209         if (IS_RIP_DEBUG_EVENT)
 210                 zlog_debug("%s: register VRF %s(%u) to zebra", __func__,
 211                            vrf->name, vrf->vrf_id);
 212
 213         zclient_send_reg_requests(zclient, vrf->vrf_id);
 214 }
 215
 216 void rip_zebra_vrf_deregister(struct vrf *vrf)
 217 {
 218         if (vrf->vrf_id == VRF_DEFAULT)
 219                 return;
 220
 221         if (IS_RIP_DEBUG_EVENT)
 222                 zlog_debug("%s: deregister VRF %s(%u) from zebra.", __func__,
 223                            vrf->name, vrf->vrf_id);
 224
 225         zclient_send_dereg_requests(zclient, vrf->vrf_id);
 226 }
 227
 228 static void rip_zebra_connected(struct zclient *zclient)
 229 {
 230         zclient_send_reg_requests(zclient, VRF_DEFAULT);
 231 }
 232
 233 void rip_zclient_init(struct thread_master *master)
 234 {
 235         /* Set default value to the zebra client structure. */
 236         zclient = zclient_new(master, &zclient_options_default);
 237         zclient_init(zclient, ZEBRA_ROUTE_RIP, 0, &ripd_privs);
 238         zclient->zebra_connected = rip_zebra_connected;
 239         zclient->interface_address_add = rip_interface_address_add;
 240         zclient->interface_address_delete = rip_interface_address_delete;
 241         zclient->interface_vrf_update = rip_interface_vrf_update;
 242         zclient->redistribute_route_add = rip_zebra_read_route;
 243         zclient->redistribute_route_del = rip_zebra_read_route;
 244 }
 245
 246 void rip_zclient_stop(void)
 247 {
 248         zclient_stop(zclient);
 249         zclient_free(zclient);
 250 }