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/zebra_vrf.h"
  43 #include "zebra/router-id.h"
  44 #include "zebra/redistribute.h"
  45
  46 /* master zebra server structure */
  47 extern struct zebra_t zebrad;
  48
  49 static struct connected *router_id_find_node(struct list *l,
  50                                              struct connected *ifc)
  51 {
  52         struct listnode *node;
  53         struct connected *c;
  54
  55         for (ALL_LIST_ELEMENTS_RO(l, node, c))
  56                 if (prefix_same(ifc->address, c->address))
  57                         return c;
  58
  59         return NULL;
  60 }
  61
  62 static int router_id_bad_address(struct connected *ifc)
  63 {
  64         if (ifc->address->family != AF_INET)
  65                 return 1;
  66
  67         /* non-redistributable addresses shouldn't be used for RIDs either */
  68         if (!zebra_check_addr(ifc->address))
  69                 return 1;
  70
  71         return 0;
  72 }
  73
  74 void router_id_get(struct prefix *p, vrf_id_t vrf_id)
  75 {
  76         struct listnode *node;
  77         struct connected *c;
  78         struct zebra_vrf *zvrf = vrf_info_get(vrf_id);
  79
  80         p->u.prefix4.s_addr = 0;
  81         p->family = AF_INET;
  82         p->prefixlen = 32;
  83
  84         if (zvrf->rid_user_assigned.u.prefix4.s_addr)
  85                 p->u.prefix4.s_addr = zvrf->rid_user_assigned.u.prefix4.s_addr;
  86         else if (!list_isempty(zvrf->rid_lo_sorted_list)) {
  87                 node = listtail(zvrf->rid_lo_sorted_list);
  88                 c = listgetdata(node);
  89                 p->u.prefix4.s_addr = c->address->u.prefix4.s_addr;
  90         } else if (!list_isempty(zvrf->rid_all_sorted_list)) {
  91                 node = listtail(zvrf->rid_all_sorted_list);
  92                 c = listgetdata(node);
  93                 p->u.prefix4.s_addr = c->address->u.prefix4.s_addr;
  94         }
  95 }
  96
  97 static void router_id_set(struct prefix *p, vrf_id_t vrf_id)
  98 {
  99         struct prefix p2;
 100         struct listnode *node;
 101         struct zserv *client;
 102         struct zebra_vrf *zvrf;
 103
 104         if (p->u.prefix4.s_addr == 0) /* unset */
 105         {
 106                 zvrf = vrf_info_lookup(vrf_id);
 107                 if (!zvrf)
 108                         return;
 109         } else /* set */
 110                 zvrf = vrf_info_get(vrf_id);
 111
 112         zvrf->rid_user_assigned.u.prefix4.s_addr = p->u.prefix4.s_addr;
 113
 114         router_id_get(&p2, vrf_id);
 115
 116         for (ALL_LIST_ELEMENTS_RO(zebrad.client_list, node, client))
 117                 zsend_router_id_update(client, &p2, vrf_id);
 118 }
 119
 120 void router_id_add_address(struct connected *ifc)
 121 {
 122         struct list *l = NULL;
 123         struct listnode *node;
 124         struct prefix before;
 125         struct prefix after;
 126         struct zserv *client;
 127         struct zebra_vrf *zvrf = vrf_info_get(ifc->ifp->vrf_id);
 128
 129         if (router_id_bad_address(ifc))
 130                 return;
 131
 132         router_id_get(&before, zvrf_id(zvrf));
 133
 134         if (!strncmp(ifc->ifp->name, "lo", 2)
 135             || !strncmp(ifc->ifp->name, "dummy", 5))
 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 (!strncmp(ifc->ifp->name, "lo", 2)
 168             || !strncmp(ifc->ifp->name, "dummy", 5))
 169                 l = zvrf->rid_lo_sorted_list;
 170         else
 171                 l = zvrf->rid_all_sorted_list;
 172
 173         if ((c = router_id_find_node(l, ifc)))
 174                 listnode_delete(l, c);
 175
 176         router_id_get(&after, zvrf_id(zvrf));
 177
 178         if (prefix_same(&before, &after))
 179                 return;
 180
 181         for (ALL_LIST_ELEMENTS_RO(zebrad.client_list, node, client))
 182                 zsend_router_id_update(client, &after, zvrf_id(zvrf));
 183 }
 184
 185 void router_id_write(struct vty *vty)
 186 {
 187         struct vrf *vrf;
 188         struct zebra_vrf *zvrf;
 189
 190         RB_FOREACH(vrf, vrf_name_head, &vrfs_by_name)
 191         if ((zvrf = vrf->info) != NULL)
 192                 if (zvrf->rid_user_assigned.u.prefix4.s_addr) {
 193                         if (zvrf_id(zvrf) == VRF_DEFAULT)
 194                                 vty_out(vty, "router-id %s\n",
 195                                         inet_ntoa(zvrf->rid_user_assigned.u
 196                                                           .prefix4));
 197                         else
 198                                 vty_out(vty, "router-id %s vrf %s\n",
 199                                         inet_ntoa(zvrf->rid_user_assigned.u
 200                                                           .prefix4),
 201                                         zvrf_name(zvrf));
 202                 }
 203 }
 204
 205 DEFUN (router_id,
 206        router_id_cmd,
 207        "router-id A.B.C.D [vrf NAME]",
 208        "Manually set the router-id\n"
 209        "IP address to use for router-id\n"
 210        VRF_CMD_HELP_STR)
 211 {
 212         int idx_ipv4 = 1;
 213         int idx_name = 3;
 214
 215         struct prefix rid;
 216         vrf_id_t vrf_id = VRF_DEFAULT;
 217
 218         rid.u.prefix4.s_addr = inet_addr(argv[idx_ipv4]->arg);
 219         if (!rid.u.prefix4.s_addr)
 220                 return CMD_WARNING_CONFIG_FAILED;
 221
 222         rid.prefixlen = 32;
 223         rid.family = AF_INET;
 224
 225         if (argc > 2)
 226                 VRF_GET_ID(vrf_id, argv[idx_name]->arg);
 227
 228         router_id_set(&rid, vrf_id);
 229
 230         return CMD_SUCCESS;
 231 }
 232
 233 DEFUN (no_router_id,
 234        no_router_id_cmd,
 235        "no router-id [A.B.C.D [vrf NAME]]",
 236        NO_STR
 237        "Remove the manually configured router-id\n"
 238        "IP address to use for router-id\n"
 239        VRF_CMD_HELP_STR)
 240 {
 241         int idx_name = 4;
 242
 243         struct prefix rid;
 244         vrf_id_t vrf_id = VRF_DEFAULT;
 245
 246         rid.u.prefix4.s_addr = 0;
 247         rid.prefixlen = 0;
 248         rid.family = AF_INET;
 249
 250         if (argc > 3)
 251                 VRF_GET_ID(vrf_id, argv[idx_name]->arg);
 252
 253         router_id_set(&rid, vrf_id);
 254
 255         return CMD_SUCCESS;
 256 }
 257
 258
 259 static int router_id_cmp(void *a, void *b)
 260 {
 261         const struct connected *ifa = (const struct connected *)a;
 262         const struct connected *ifb = (const struct connected *)b;
 263
 264         return IPV4_ADDR_CMP(&ifa->address->u.prefix4.s_addr,
 265                              &ifb->address->u.prefix4.s_addr);
 266 }
 267
 268 void router_id_cmd_init(void)
 269 {
 270         install_element(CONFIG_NODE, &router_id_cmd);
 271         install_element(CONFIG_NODE, &no_router_id_cmd);
 272 }
 273
 274 void router_id_init(struct zebra_vrf *zvrf)
 275 {
 276         zvrf->rid_all_sorted_list = &zvrf->_rid_all_sorted_list;
 277         zvrf->rid_lo_sorted_list = &zvrf->_rid_lo_sorted_list;
 278
 279         memset(zvrf->rid_all_sorted_list, 0,
 280                sizeof(zvrf->_rid_all_sorted_list));
 281         memset(zvrf->rid_lo_sorted_list, 0, sizeof(zvrf->_rid_lo_sorted_list));
 282         memset(&zvrf->rid_user_assigned, 0, sizeof(zvrf->rid_user_assigned));
 283
 284         zvrf->rid_all_sorted_list->cmp = router_id_cmp;
 285         zvrf->rid_lo_sorted_list->cmp = router_id_cmp;
 286
 287         zvrf->rid_user_assigned.family = AF_INET;
 288         zvrf->rid_user_assigned.prefixlen = 32;
 289 }