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 route_node *rp, uint8_t cmd)
  40 {
  41         struct list *list = (struct list *)rp->info;
  42         struct zapi_route api;
  43         struct zapi_nexthop *api_nh;
  44         struct listnode *listnode = NULL;
  45         struct rip_info *rinfo = NULL;
  46         int count = 0;
  47
  48         memset(&api, 0, sizeof(api));
  49         api.vrf_id = VRF_DEFAULT;
  50         api.type = ZEBRA_ROUTE_RIP;
  51         api.safi = SAFI_UNICAST;
  52
  53         SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
  54         for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) {
  55                 if (count >= MULTIPATH_NUM)
  56                         break;
  57                 api_nh = &api.nexthops[count];
  58                 api_nh->vrf_id = VRF_DEFAULT;
  59                 api_nh->gate = rinfo->nh.gate;
  60                 api_nh->type = NEXTHOP_TYPE_IPV4;
  61                 if (cmd == ZEBRA_ROUTE_ADD)
  62                         SET_FLAG(rinfo->flags, RIP_RTF_FIB);
  63                 else
  64                         UNSET_FLAG(rinfo->flags, RIP_RTF_FIB);
  65                 count++;
  66         }
  67
  68         api.prefix = rp->p;
  69         api.nexthop_num = count;
  70
  71         rinfo = listgetdata(listhead(list));
  72
  73         SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
  74         api.metric = rinfo->metric;
  75
  76         if (rinfo->distance && rinfo->distance != ZEBRA_RIP_DISTANCE_DEFAULT) {
  77                 SET_FLAG(api.message, ZAPI_MESSAGE_DISTANCE);
  78                 api.distance = rinfo->distance;
  79         }
  80
  81         if (rinfo->tag) {
  82                 SET_FLAG(api.message, ZAPI_MESSAGE_TAG);
  83                 api.tag = rinfo->tag;
  84         }
  85
  86         zclient_route_send(cmd, zclient, &api);
  87
  88         if (IS_RIP_DEBUG_ZEBRA) {
  89                 if (rip->ecmp)
  90                         zlog_debug("%s: %s/%d nexthops %d",
  91                                    (cmd == ZEBRA_ROUTE_ADD)
  92                                            ? "Install into zebra"
  93                                            : "Delete from zebra",
  94                                    inet_ntoa(rp->p.u.prefix4), rp->p.prefixlen,
  95                                    count);
  96                 else
  97                         zlog_debug("%s: %s/%d",
  98                                    (cmd == ZEBRA_ROUTE_ADD)
  99                                            ? "Install into zebra"
 100                                            : "Delete from zebra",
 101                                    inet_ntoa(rp->p.u.prefix4), rp->p.prefixlen);
 102         }
 103
 104         rip_global_route_changes++;
 105 }
 106
 107 /* Add/update ECMP routes to zebra. */
 108 void rip_zebra_ipv4_add(struct route_node *rp)
 109 {
 110         rip_zebra_ipv4_send(rp, ZEBRA_ROUTE_ADD);
 111 }
 112
 113 /* Delete ECMP routes from zebra. */
 114 void rip_zebra_ipv4_delete(struct route_node *rp)
 115 {
 116         rip_zebra_ipv4_send(rp, ZEBRA_ROUTE_DELETE);
 117 }
 118
 119 /* Zebra route add and delete treatment. */
 120 static int rip_zebra_read_route(int command, struct zclient *zclient,
 121                                 zebra_size_t length, vrf_id_t vrf_id)
 122 {
 123         struct zapi_route api;
 124         struct nexthop nh;
 125
 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 (command == ZEBRA_REDISTRIBUTE_ROUTE_ADD)
 139                 rip_redistribute_add(api.type, RIP_ROUTE_REDISTRIBUTE,
 140                                      (struct prefix_ipv4 *)&api.prefix, &nh,
 141                                      api.metric, api.distance, api.tag);
 142         else if (command == ZEBRA_REDISTRIBUTE_ROUTE_DEL)
 143                 rip_redistribute_delete(api.type, RIP_ROUTE_REDISTRIBUTE,
 144                                         (struct prefix_ipv4 *)&api.prefix,
 145                                         nh.ifindex);
 146
 147         return 0;
 148 }
 149
 150 void rip_zclient_reset(void)
 151 {
 152         zclient_reset(zclient);
 153 }
 154
 155 void rip_redistribute_conf_update(int type)
 156 {
 157         zclient_redistribute(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP, type,
 158                              0, VRF_DEFAULT);
 159 }
 160
 161 void rip_redistribute_conf_delete(int type)
 162 {
 163         if (zclient->sock > 0)
 164                 zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient,
 165                                         AFI_IP, type, 0, VRF_DEFAULT);
 166
 167         /* Remove the routes from RIP table. */
 168         rip_redistribute_withdraw(type);
 169 }
 170
 171 int rip_redistribute_check(int type)
 172 {
 173         return vrf_bitmap_check(zclient->redist[AFI_IP][type], VRF_DEFAULT);
 174 }
 175
 176 void rip_redistribute_clean(void)
 177 {
 178         for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) {
 179                 if (!vrf_bitmap_check(zclient->redist[AFI_IP][i], VRF_DEFAULT))
 180                         continue;
 181
 182                 if (zclient->sock > 0)
 183                         zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE,
 184                                                 zclient, AFI_IP, i, 0,
 185                                                 VRF_DEFAULT);
 186
 187                 vrf_bitmap_unset(zclient->redist[AFI_IP][i], VRF_DEFAULT);
 188
 189                 /* Remove the routes from RIP table. */
 190                 rip_redistribute_withdraw(i);
 191         }
 192 }
 193
 194 void rip_show_redistribute_config(struct vty *vty)
 195 {
 196         for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) {
 197                 if (i == zclient->redist_default
 198                     || !vrf_bitmap_check(zclient->redist[AFI_IP][i],
 199                                          VRF_DEFAULT))
 200                         continue;
 201
 202                 vty_out(vty, " %s", zebra_route_string(i));
 203         }
 204 }
 205
 206 static void rip_zebra_connected(struct zclient *zclient)
 207 {
 208         zclient_send_reg_requests(zclient, VRF_DEFAULT);
 209 }
 210
 211 void rip_zclient_init(struct thread_master *master)
 212 {
 213         /* Set default value to the zebra client structure. */
 214         zclient = zclient_new(master, &zclient_options_default);
 215         zclient_init(zclient, ZEBRA_ROUTE_RIP, 0, &ripd_privs);
 216         zclient->zebra_connected = rip_zebra_connected;
 217         zclient->interface_add = rip_interface_add;
 218         zclient->interface_delete = rip_interface_delete;
 219         zclient->interface_address_add = rip_interface_address_add;
 220         zclient->interface_address_delete = rip_interface_address_delete;
 221         zclient->interface_up = rip_interface_up;
 222         zclient->interface_down = rip_interface_down;
 223         zclient->redistribute_route_add = rip_zebra_read_route;
 224         zclient->redistribute_route_del = rip_zebra_read_route;
 225 }
 226
 227 void rip_zclient_stop(void)
 228 {
 229         zclient_stop(zclient);
 230         zclient_free(zclient);
 231 }