ripngd/ripng_zebra.c

   1 /*
   2  * RIPngd and zebra interface.
   3  * Copyright (C) 1998, 1999 Kunihiro Ishiguro
   4  *
   5  * This file is part of GNU Zebra.
   6  *
   7  * GNU Zebra is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2, or (at your option) any
  10  * later version.
  11  *
  12  * GNU Zebra is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; see the file COPYING; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include <zebra.h>
  23
  24 #include "command.h"
  25 #include "prefix.h"
  26 #include "agg_table.h"
  27 #include "stream.h"
  28 #include "memory.h"
  29 #include "routemap.h"
  30 #include "zclient.h"
  31 #include "log.h"
  32
  33 #include "ripngd/ripngd.h"
  34 #include "ripngd/ripng_debug.h"
  35
  36 /* All information about zebra. */
  37 struct zclient *zclient = NULL;
  38
  39 /* Send ECMP routes to zebra. */
  40 static void ripng_zebra_ipv6_send(struct agg_node *rp, 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 ripng_info *rinfo = NULL;
  47         int count = 0;
  48
  49         memset(&api, 0, sizeof(api));
  50         api.vrf_id = VRF_DEFAULT;
  51         api.type = ZEBRA_ROUTE_RIPNG;
  52         api.safi = SAFI_UNICAST;
  53         api.prefix = rp->p;
  54
  55         SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
  56         for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) {
  57                 if (count >= MULTIPATH_NUM)
  58                         break;
  59                 api_nh = &api.nexthops[count];
  60                 api_nh->vrf_id = VRF_DEFAULT;
  61                 api_nh->gate.ipv6 = rinfo->nexthop;
  62                 api_nh->ifindex = rinfo->ifindex;
  63                 api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX;
  64                 count++;
  65                 if (cmd == ZEBRA_ROUTE_ADD)
  66                         SET_FLAG(rinfo->flags, RIPNG_RTF_FIB);
  67                 else
  68                         UNSET_FLAG(rinfo->flags, RIPNG_RTF_FIB);
  69         }
  70
  71         api.nexthop_num = count;
  72
  73         rinfo = listgetdata(listhead(list));
  74
  75         SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
  76         api.metric = rinfo->metric;
  77
  78         if (rinfo->tag) {
  79                 SET_FLAG(api.message, ZAPI_MESSAGE_TAG);
  80                 api.tag = rinfo->tag;
  81         }
  82
  83         zclient_route_send(cmd, zclient, &api);
  84
  85         if (IS_RIPNG_DEBUG_ZEBRA) {
  86                 if (ripng->ecmp)
  87                         zlog_debug("%s: %s/%d nexthops %d",
  88                                    (cmd == ZEBRA_ROUTE_ADD)
  89                                            ? "Install into zebra"
  90                                            : "Delete from zebra",
  91                                    inet6_ntoa(rp->p.u.prefix6), rp->p.prefixlen,
  92                                    count);
  93                 else
  94                         zlog_debug(
  95                                 "%s: %s/%d",
  96                                 (cmd == ZEBRA_ROUTE_ADD) ? "Install into zebra"
  97                                                          : "Delete from zebra",
  98                                 inet6_ntoa(rp->p.u.prefix6), rp->p.prefixlen);
  99         }
 100 }
 101
 102 /* Add/update ECMP routes to zebra. */
 103 void ripng_zebra_ipv6_add(struct agg_node *rp)
 104 {
 105         ripng_zebra_ipv6_send(rp, ZEBRA_ROUTE_ADD);
 106 }
 107
 108 /* Delete ECMP routes from zebra. */
 109 void ripng_zebra_ipv6_delete(struct agg_node *rp)
 110 {
 111         ripng_zebra_ipv6_send(rp, ZEBRA_ROUTE_DELETE);
 112 }
 113
 114 /* Zebra route add and delete treatment. */
 115 static int ripng_zebra_read_route(int command, struct zclient *zclient,
 116                                   zebra_size_t length, vrf_id_t vrf_id)
 117 {
 118         struct zapi_route api;
 119         struct in6_addr nexthop;
 120         unsigned long ifindex;
 121
 122         if (zapi_route_decode(zclient->ibuf, &api) < 0)
 123                 return -1;
 124
 125         /* we completely ignore srcdest routes for now. */
 126         if (CHECK_FLAG(api.message, ZAPI_MESSAGE_SRCPFX))
 127                 return 0;
 128
 129         if (IN6_IS_ADDR_LINKLOCAL(&api.prefix.u.prefix6))
 130                 return 0;
 131
 132         nexthop = api.nexthops[0].gate.ipv6;
 133         ifindex = api.nexthops[0].ifindex;
 134
 135         if (command == ZEBRA_REDISTRIBUTE_ROUTE_ADD)
 136                 ripng_redistribute_add(api.type, RIPNG_ROUTE_REDISTRIBUTE,
 137                                        (struct prefix_ipv6 *)&api.prefix,
 138                                        ifindex, &nexthop, api.tag);
 139         else
 140                 ripng_redistribute_delete(api.type, RIPNG_ROUTE_REDISTRIBUTE,
 141                                           (struct prefix_ipv6 *)&api.prefix,
 142                                           ifindex);
 143
 144         return 0;
 145 }
 146
 147 void ripng_redistribute_conf_update(int type)
 148 {
 149         zclient_redistribute(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP6, type, 0,
 150                              VRF_DEFAULT);
 151 }
 152
 153 void ripng_redistribute_conf_delete(int type)
 154 {
 155         if (zclient->sock > 0)
 156                 zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient,
 157                                         AFI_IP6, type, 0, VRF_DEFAULT);
 158
 159         ripng_redistribute_withdraw(type);
 160 }
 161
 162 int ripng_redistribute_check(int type)
 163 {
 164         return vrf_bitmap_check(zclient->redist[AFI_IP6][type], VRF_DEFAULT);
 165 }
 166
 167 void ripng_redistribute_clean(void)
 168 {
 169         for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) {
 170                 if (!vrf_bitmap_check(zclient->redist[AFI_IP6][i], VRF_DEFAULT))
 171                         continue;
 172
 173                 if (zclient->sock > 0)
 174                         zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE,
 175                                                 zclient, AFI_IP6, i, 0,
 176                                                 VRF_DEFAULT);
 177
 178                 vrf_bitmap_unset(zclient->redist[AFI_IP6][i], VRF_DEFAULT);
 179
 180                 /* Remove the routes from RIP table. */
 181                 ripng_redistribute_withdraw(i);
 182         }
 183 }
 184
 185 void ripng_redistribute_write(struct vty *vty)
 186 {
 187         int i;
 188
 189         for (i = 0; i < ZEBRA_ROUTE_MAX; i++) {
 190                 if (i == zclient->redist_default
 191                     || !vrf_bitmap_check(zclient->redist[AFI_IP6][i],
 192                                          VRF_DEFAULT))
 193                         continue;
 194
 195                 vty_out(vty, "    %s", zebra_route_string(i));
 196         }
 197 }
 198
 199 static void ripng_zebra_connected(struct zclient *zclient)
 200 {
 201         zclient_send_reg_requests(zclient, VRF_DEFAULT);
 202 }
 203
 204 /* Initialize zebra structure and it's commands. */
 205 void zebra_init(struct thread_master *master)
 206 {
 207         /* Allocate zebra structure. */
 208         zclient = zclient_new(master, &zclient_options_default);
 209         zclient_init(zclient, ZEBRA_ROUTE_RIPNG, 0, &ripngd_privs);
 210
 211         zclient->zebra_connected = ripng_zebra_connected;
 212         zclient->interface_up = ripng_interface_up;
 213         zclient->interface_down = ripng_interface_down;
 214         zclient->interface_add = ripng_interface_add;
 215         zclient->interface_delete = ripng_interface_delete;
 216         zclient->interface_address_add = ripng_interface_address_add;
 217         zclient->interface_address_delete = ripng_interface_address_delete;
 218         zclient->redistribute_route_add = ripng_zebra_read_route;
 219         zclient->redistribute_route_del = ripng_zebra_read_route;
 220 }
 221
 222 void ripng_zebra_stop(void)
 223 {
 224         zclient_stop(zclient);
 225         zclient_free(zclient);
 226 }