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 ripng *ripng, struct agg_node *rp,
  41                                   uint8_t cmd)
  42 {
  43         struct list *list = (struct list *)rp->info;
  44         struct zapi_route api;
  45         struct zapi_nexthop *api_nh;
  46         struct listnode *listnode = NULL;
  47         struct ripng_info *rinfo = NULL;
  48         int count = 0;
  49
  50         memset(&api, 0, sizeof(api));
  51         api.vrf_id = ripng->vrf->vrf_id;
  52         api.type = ZEBRA_ROUTE_RIPNG;
  53         api.safi = SAFI_UNICAST;
  54         api.prefix = rp->p;
  55
  56         SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
  57         for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) {
  58                 if (count >= MULTIPATH_NUM)
  59                         break;
  60                 api_nh = &api.nexthops[count];
  61                 api_nh->vrf_id = ripng->vrf->vrf_id;
  62                 api_nh->gate.ipv6 = rinfo->nexthop;
  63                 api_nh->ifindex = rinfo->ifindex;
  64                 api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX;
  65                 count++;
  66                 if (cmd == ZEBRA_ROUTE_ADD)
  67                         SET_FLAG(rinfo->flags, RIPNG_RTF_FIB);
  68                 else
  69                         UNSET_FLAG(rinfo->flags, RIPNG_RTF_FIB);
  70         }
  71
  72         api.nexthop_num = count;
  73
  74         rinfo = listgetdata(listhead(list));
  75
  76         SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
  77         api.metric = rinfo->metric;
  78
  79         if (rinfo->tag) {
  80                 SET_FLAG(api.message, ZAPI_MESSAGE_TAG);
  81                 api.tag = rinfo->tag;
  82         }
  83
  84         zclient_route_send(cmd, zclient, &api);
  85
  86         if (IS_RIPNG_DEBUG_ZEBRA) {
  87                 if (ripng->ecmp)
  88                         zlog_debug("%s: %s/%d nexthops %d",
  89                                    (cmd == ZEBRA_ROUTE_ADD)
  90                                            ? "Install into zebra"
  91                                            : "Delete from zebra",
  92                                    inet6_ntoa(rp->p.u.prefix6), rp->p.prefixlen,
  93                                    count);
  94                 else
  95                         zlog_debug(
  96                                 "%s: %s/%d",
  97                                 (cmd == ZEBRA_ROUTE_ADD) ? "Install into zebra"
  98                                                          : "Delete from zebra",
  99                                 inet6_ntoa(rp->p.u.prefix6), rp->p.prefixlen);
 100         }
 101 }
 102
 103 /* Add/update ECMP routes to zebra. */
 104 void ripng_zebra_ipv6_add(struct ripng *ripng, struct agg_node *rp)
 105 {
 106         ripng_zebra_ipv6_send(ripng, rp, ZEBRA_ROUTE_ADD);
 107 }
 108
 109 /* Delete ECMP routes from zebra. */
 110 void ripng_zebra_ipv6_delete(struct ripng *ripng, struct agg_node *rp)
 111 {
 112         ripng_zebra_ipv6_send(ripng, rp, ZEBRA_ROUTE_DELETE);
 113 }
 114
 115 /* Zebra route add and delete treatment. */
 116 static int ripng_zebra_read_route(int command, struct zclient *zclient,
 117                                   zebra_size_t length, vrf_id_t vrf_id)
 118 {
 119         struct ripng *ripng;
 120         struct zapi_route api;
 121         struct in6_addr nexthop;
 122         unsigned long ifindex;
 123
 124         ripng = ripng_lookup_by_vrf_id(vrf_id);
 125         if (!ripng)
 126                 return 0;
 127
 128         if (zapi_route_decode(zclient->ibuf, &api) < 0)
 129                 return -1;
 130
 131         /* we completely ignore srcdest routes for now. */
 132         if (CHECK_FLAG(api.message, ZAPI_MESSAGE_SRCPFX))
 133                 return 0;
 134
 135         if (IN6_IS_ADDR_LINKLOCAL(&api.prefix.u.prefix6))
 136                 return 0;
 137
 138         nexthop = api.nexthops[0].gate.ipv6;
 139         ifindex = api.nexthops[0].ifindex;
 140
 141         if (command == ZEBRA_REDISTRIBUTE_ROUTE_ADD)
 142                 ripng_redistribute_add(ripng, api.type,
 143                                        RIPNG_ROUTE_REDISTRIBUTE,
 144                                        (struct prefix_ipv6 *)&api.prefix,
 145                                        ifindex, &nexthop, api.tag);
 146         else
 147                 ripng_redistribute_delete(
 148                         ripng, api.type, RIPNG_ROUTE_REDISTRIBUTE,
 149                         (struct prefix_ipv6 *)&api.prefix, ifindex);
 150
 151         return 0;
 152 }
 153
 154 void ripng_redistribute_conf_update(struct ripng *ripng, int type)
 155 {
 156         zclient_redistribute(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP6, type, 0,
 157                              ripng->vrf->vrf_id);
 158 }
 159
 160 void ripng_redistribute_conf_delete(struct ripng *ripng, int type)
 161 {
 162         if (zclient->sock > 0)
 163                 zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient,
 164                                         AFI_IP6, type, 0, ripng->vrf->vrf_id);
 165
 166         ripng_redistribute_withdraw(ripng, type);
 167 }
 168
 169 int ripng_redistribute_check(struct ripng *ripng, int type)
 170 {
 171         return ripng->redist[type].enabled;
 172 }
 173
 174 void ripng_redistribute_enable(struct ripng *ripng)
 175 {
 176         for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) {
 177                 if (!ripng_redistribute_check(ripng, i))
 178                         continue;
 179
 180                 zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient,
 181                                         AFI_IP6, i, 0, ripng->vrf->vrf_id);
 182         }
 183 }
 184
 185 void ripng_redistribute_disable(struct ripng *ripng)
 186 {
 187         for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) {
 188                 if (!ripng_redistribute_check(ripng, i))
 189                         continue;
 190
 191                 zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient,
 192                                         AFI_IP6, i, 0, ripng->vrf->vrf_id);
 193         }
 194 }
 195
 196 void ripng_redistribute_write(struct vty *vty, struct ripng *ripng)
 197 {
 198         int i;
 199
 200         for (i = 0; i < ZEBRA_ROUTE_MAX; i++) {
 201                 if (i == zclient->redist_default
 202                     || !ripng_redistribute_check(ripng, i))
 203                         continue;
 204
 205                 vty_out(vty, "    %s", zebra_route_string(i));
 206         }
 207 }
 208
 209 void ripng_zebra_vrf_register(struct vrf *vrf)
 210 {
 211         if (vrf->vrf_id == VRF_DEFAULT)
 212                 return;
 213
 214         if (IS_RIPNG_DEBUG_EVENT)
 215                 zlog_debug("%s: register VRF %s(%u) to zebra", __func__,
 216                            vrf->name, vrf->vrf_id);
 217
 218         zclient_send_reg_requests(zclient, vrf->vrf_id);
 219 }
 220
 221 void ripng_zebra_vrf_deregister(struct vrf *vrf)
 222 {
 223         if (vrf->vrf_id == VRF_DEFAULT)
 224                 return;
 225
 226         if (IS_RIPNG_DEBUG_EVENT)
 227                 zlog_debug("%s: deregister VRF %s(%u) from zebra.", __func__,
 228                            vrf->name, vrf->vrf_id);
 229
 230         zclient_send_dereg_requests(zclient, vrf->vrf_id);
 231 }
 232
 233 static void ripng_zebra_connected(struct zclient *zclient)
 234 {
 235         zclient_send_reg_requests(zclient, VRF_DEFAULT);
 236 }
 237
 238 /* Initialize zebra structure and it's commands. */
 239 void zebra_init(struct thread_master *master)
 240 {
 241         /* Allocate zebra structure. */
 242         zclient = zclient_new(master, &zclient_options_default);
 243         zclient_init(zclient, ZEBRA_ROUTE_RIPNG, 0, &ripngd_privs);
 244
 245         zclient->zebra_connected = ripng_zebra_connected;
 246         zclient->interface_up = ripng_interface_up;
 247         zclient->interface_down = ripng_interface_down;
 248         zclient->interface_add = ripng_interface_add;
 249         zclient->interface_delete = ripng_interface_delete;
 250         zclient->interface_address_add = ripng_interface_address_add;
 251         zclient->interface_address_delete = ripng_interface_address_delete;
 252         zclient->interface_vrf_update = ripng_interface_vrf_update;
 253         zclient->redistribute_route_add = ripng_zebra_read_route;
 254         zclient->redistribute_route_del = ripng_zebra_read_route;
 255 }
 256
 257 void ripng_zebra_stop(void)
 258 {
 259         zclient_stop(zclient);
 260         zclient_free(zclient);
 261 }