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