zebra/router-id.c

   1 /*
   2  * Router ID for zebra daemon.
   3  *
   4  * Copyright (C) 2004 James R. Leu
   5  *
   6  * This file is part of Quagga routing suite.
   7  *
   8  * Quagga is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the
  10  * Free Software Foundation; either version 2, or (at your option) any
  11  * later version.
  12  *
  13  * Quagga is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; see the file COPYING; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include <zebra.h>
  24
  25 #include "if.h"
  26 #include "vty.h"
  27 #include "sockunion.h"
  28 #include "prefix.h"
  29 #include "stream.h"
  30 #include "command.h"
  31 #include "memory.h"
  32 #include "zebra_memory.h"
  33 #include "ioctl.h"
  34 #include "connected.h"
  35 #include "network.h"
  36 #include "log.h"
  37 #include "table.h"
  38 #include "rib.h"
  39 #include "vrf.h"
  40
  41 #include "zebra/zserv.h"
  42 #include "zebra/zapi_msg.h"
  43 #include "zebra/zebra_vrf.h"
  44 #include "zebra/router-id.h"
  45 #include "zebra/redistribute.h"
  46
  47 /* master zebra server structure */
  48 extern struct zebra_t zebrad;
  49
  50 static struct connected *router_id_find_node(struct list *l,
  51                                              struct connected *ifc)
  52 {
  53         struct listnode *node;
  54         struct connected *c;
  55
  56         for (ALL_LIST_ELEMENTS_RO(l, node, c))
  57                 if (prefix_same(ifc->address, c->address))
  58                         return c;
  59
  60         return NULL;
  61 }
  62
  63 static int router_id_bad_address(struct connected *ifc)
  64 {
  65         if (ifc->address->family != AF_INET)
  66                 return 1;
  67
  68         /* non-redistributable addresses shouldn't be used for RIDs either */
  69         if (!zebra_check_addr(ifc->address))
  70                 return 1;
  71
  72         return 0;
  73 }
  74
  75 void router_id_get(struct prefix *p, vrf_id_t vrf_id)
  76 {
  77         struct listnode *node;
  78         struct connected *c;
  79         struct zebra_vrf *zvrf = vrf_info_get(vrf_id);
  80
  81         p->u.prefix4.s_addr = 0;
  82         p->family = AF_INET;
  83         p->prefixlen = 32;
  84
  85         if (zvrf->rid_user_assigned.u.prefix4.s_addr)
  86                 p->u.prefix4.s_addr = zvrf->rid_user_assigned.u.prefix4.s_addr;
  87         else if (!list_isempty(zvrf->rid_lo_sorted_list)) {
  88                 node = listtail(zvrf->rid_lo_sorted_list);
  89                 c = listgetdata(node);
  90                 p->u.prefix4.s_addr = c->address->u.prefix4.s_addr;
  91         } else if (!list_isempty(zvrf->rid_all_sorted_list)) {
  92                 node = listtail(zvrf->rid_all_sorted_list);
  93                 c = listgetdata(node);
  94                 p->u.prefix4.s_addr = c->address->u.prefix4.s_addr;
  95         }
  96 }
  97
  98 static void router_id_set(struct prefix *p, vrf_id_t vrf_id)
  99 {
 100         struct prefix p2;
 101         struct listnode *node;
 102         struct zserv *client;
 103         struct zebra_vrf *zvrf;
 104
 105         if (p->u.prefix4.s_addr == 0) /* unset */
 106         {
 107                 zvrf = vrf_info_lookup(vrf_id);
 108                 if (!zvrf)
 109                         return;
 110         } else /* set */
 111                 zvrf = vrf_info_get(vrf_id);
 112
 113         zvrf->rid_user_assigned.u.prefix4.s_addr = p->u.prefix4.s_addr;
 114
 115         router_id_get(&p2, vrf_id);
 116
 117         for (ALL_LIST_ELEMENTS_RO(zebrad.client_list, node, client))
 118                 zsend_router_id_update(client, &p2, vrf_id);
 119 }
 120
 121 void router_id_add_address(struct connected *ifc)
 122 {
 123         struct list *l = NULL;
 124         struct listnode *node;
 125         struct prefix before;
 126         struct prefix after;
 127         struct zserv *client;
 128         struct zebra_vrf *zvrf = vrf_info_get(ifc->ifp->vrf_id);
 129
 130         if (router_id_bad_address(ifc))
 131                 return;
 132
 133         router_id_get(&before, zvrf_id(zvrf));
 134
 135         if (if_is_loopback(ifc->ifp))
 136                 l = zvrf->rid_lo_sorted_list;
 137         else
 138                 l = zvrf->rid_all_sorted_list;
 139
 140         if (!router_id_find_node(l, ifc))
 141                 listnode_add_sort(l, ifc);
 142
 143         router_id_get(&after, zvrf_id(zvrf));
 144
 145         if (prefix_same(&before, &after))
 146                 return;
 147
 148         for (ALL_LIST_ELEMENTS_RO(zebrad.client_list, node, client))
 149                 zsend_router_id_update(client, &after, zvrf_id(zvrf));
 150 }
 151
 152 void router_id_del_address(struct connected *ifc)
 153 {
 154         struct connected *c;
 155         struct list *l;
 156         struct prefix after;
 157         struct prefix before;
 158         struct listnode *node;
 159         struct zserv *client;
 160         struct zebra_vrf *zvrf = vrf_info_get(ifc->ifp->vrf_id);
 161
 162         if (router_id_bad_address(ifc))
 163                 return;
 164
 165         router_id_get(&before, zvrf_id(zvrf));
 166
 167         if (if_is_loopback(ifc->ifp))
 168                 l = zvrf->rid_lo_sorted_list;
 169         else
 170                 l = zvrf->rid_all_sorted_list;
 171
 172         if ((c = router_id_find_node(l, ifc)))
 173                 listnode_delete(l, c);
 174
 175         router_id_get(&after, zvrf_id(zvrf));
 176
 177         if (prefix_same(&before, &after))
 178                 return;
 179
 180         for (ALL_LIST_ELEMENTS_RO(zebrad.client_list, node, client))
 181                 zsend_router_id_update(client, &after, zvrf_id(zvrf));
 182 }
 183
 184 void router_id_write(struct vty *vty)
 185 {
 186         struct vrf *vrf;
 187         struct zebra_vrf *zvrf;
 188
 189         RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name)
 190                 if ((zvrf = vrf->info) != NULL)
 191                         if (zvrf->rid_user_assigned.u.prefix4.s_addr) {
 192                                 if (zvrf_id(zvrf) == VRF_DEFAULT)
 193                                         vty_out(vty, "router-id %s\n",
 194                                                 inet_ntoa(
 195                                                         zvrf->rid_user_assigned
 196                                                                 .u.prefix4));
 197                                 else
 198                                         vty_out(vty, "router-id %s vrf %s\n",
 199                                                 inet_ntoa(
 200                                                         zvrf->rid_user_assigned
 201                                                                 .u.prefix4),
 202                                                 zvrf_name(zvrf));
 203                         }
 204 }
 205
 206 DEFUN (router_id,
 207        router_id_cmd,
 208        "router-id A.B.C.D [vrf NAME]",
 209        "Manually set the router-id\n"
 210        "IP address to use for router-id\n"
 211        VRF_CMD_HELP_STR)
 212 {
 213         int idx_ipv4 = 1;
 214         int idx_name = 3;
 215
 216         struct prefix rid;
 217         vrf_id_t vrf_id = VRF_DEFAULT;
 218
 219         rid.u.prefix4.s_addr = inet_addr(argv[idx_ipv4]->arg);
 220         if (!rid.u.prefix4.s_addr)
 221                 return CMD_WARNING_CONFIG_FAILED;
 222
 223         rid.prefixlen = 32;
 224         rid.family = AF_INET;
 225
 226         if (argc > 2)
 227                 VRF_GET_ID(vrf_id, argv[idx_name]->arg, false);
 228
 229         router_id_set(&rid, vrf_id);
 230
 231         return CMD_SUCCESS;
 232 }
 233
 234 DEFUN (no_router_id,
 235        no_router_id_cmd,
 236        "no router-id [A.B.C.D [vrf NAME]]",
 237        NO_STR
 238        "Remove the manually configured router-id\n"
 239        "IP address to use for router-id\n"
 240        VRF_CMD_HELP_STR)
 241 {
 242         int idx_name = 4;
 243
 244         struct prefix rid;
 245         vrf_id_t vrf_id = VRF_DEFAULT;
 246
 247         rid.u.prefix4.s_addr = 0;
 248         rid.prefixlen = 0;
 249         rid.family = AF_INET;
 250
 251         if (argc > 3)
 252                 VRF_GET_ID(vrf_id, argv[idx_name]->arg, false);
 253
 254         router_id_set(&rid, vrf_id);
 255
 256         return CMD_SUCCESS;
 257 }
 258
 259
 260 static int router_id_cmp(void *a, void *b)
 261 {
 262         const struct connected *ifa = (const struct connected *)a;
 263         const struct connected *ifb = (const struct connected *)b;
 264
 265         return IPV4_ADDR_CMP(&ifa->address->u.prefix4.s_addr,
 266                              &ifb->address->u.prefix4.s_addr);
 267 }
 268
 269 void router_id_cmd_init(void)
 270 {
 271         install_element(CONFIG_NODE, &router_id_cmd);
 272         install_element(CONFIG_NODE, &no_router_id_cmd);
 273 }
 274
 275 void router_id_init(struct zebra_vrf *zvrf)
 276 {
 277         zvrf->rid_all_sorted_list = &zvrf->_rid_all_sorted_list;
 278         zvrf->rid_lo_sorted_list = &zvrf->_rid_lo_sorted_list;
 279
 280         memset(zvrf->rid_all_sorted_list, 0,
 281                sizeof(zvrf->_rid_all_sorted_list));
 282         memset(zvrf->rid_lo_sorted_list, 0, sizeof(zvrf->_rid_lo_sorted_list));
 283         memset(&zvrf->rid_user_assigned, 0, sizeof(zvrf->rid_user_assigned));
 284
 285         zvrf->rid_all_sorted_list->cmp = router_id_cmp;
 286         zvrf->rid_lo_sorted_list->cmp = router_id_cmp;
 287
 288         zvrf->rid_user_assigned.family = AF_INET;
 289         zvrf->rid_user_assigned.prefixlen = 32;
 290 }