www.tinc-vpn.org Git - tinc/blob - src/subnet.c

   1 /*
   2     subnet.c -- handle subnet lookups and lists
   3     Copyright (C) 2000 Guus Sliepen <guus@sliepen.warande.net>,
   4                   2000 Ivo Timmermans <itimmermans@bigfoot.com>
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19
  20     $Id: subnet.c,v 1.1.2.6 2000/10/28 16:41:40 guus Exp $
  21 */
  22
  23 #include "config.h"
  24 #include <utils.h>
  25
  26 #include <xalloc.h>
  27 #include "subnet.h"
  28 #include "net.h"
  29
  30 /* lists type of subnet */
  31
  32 subnet_t *subnet_list[SUBNET_TYPES] = { NULL };
  33
  34 /* Allocating and freeing space for subnets */
  35
  36 subnet_t *new_subnet(void)
  37 {
  38 cp
  39   return (subnet_t *)xmalloc(sizeof(subnet_t));
  40 }
  41
  42 void free_subnet(subnet_t *subnet)
  43 {
  44 cp
  45   free(subnet);
  46 }
  47
  48 /* Linked list management */
  49
  50 void subnet_add(conn_list_t *cl, subnet_t *subnet)
  51 {
  52   subnet_t *p = NULL;
  53   subnet_t *q = NULL;
  54 cp
  55   subnet->owner = cl;
  56
  57   /* Link it into the owners list of subnets (unsorted) */
  58
  59   subnet->next = cl->subnets->next;
  60   subnet->prev = NULL;
  61   if(subnet->next)
  62     subnet->next->prev = subnet;
  63   cl->subnets = subnet;
  64
  65   /* And now add it to the global subnet list (sorted) */
  66
  67   /* Sort on size of subnet mask (IPv4 only at the moment!)
  68
  69      Three cases: subnet_list[] = NULL -> just add this subnet
  70                   insert before first -> add it in front of list
  71                   rest: insert after another subnet
  72    */
  73
  74   if(subnet_list[subnet->type])
  75     {
  76       p = q = subnet_list[subnet->type];
  77
  78       for(; p; p = p->global_next)
  79         {
  80           if(subnet->net.ipv4.mask >= p->net.ipv4.mask)
  81             break;
  82
  83           q = p;
  84         }
  85      }
  86
  87   if(!subnet_list[subnet->type] || p == subnet_list[subnet->type])  /* First two cases */
  88     {
  89       /* Insert in front */
  90       subnet->global_next = subnet_list[subnet->type];
  91       subnet->global_prev = NULL;
  92       subnet_list[subnet->type] = subnet;
  93     }
  94   else                                  /* Third case */
  95     {
  96       /* Insert after q */
  97       subnet->global_next = q->global_next;
  98       subnet->global_prev = q;
  99       q->global_next = subnet;
 100     }
 101
 102   if(subnet->global_next)
 103     subnet->global_next->global_prev = subnet;
 104 cp
 105 }
 106
 107 void subnet_del(subnet_t *subnet)
 108 {
 109 cp
 110   /* Remove it from owner's list */
 111
 112   if(subnet->prev)
 113     {
 114       subnet->prev->next = subnet->next;
 115     }
 116   else
 117     {
 118       subnet->owner->subnets = subnet->next;
 119     }
 120
 121   subnet->next->prev = subnet->prev;
 122
 123   /* Remove it from the global list */
 124
 125   if(subnet->global_prev)
 126     {
 127       subnet->global_prev->global_next = subnet->global_next;
 128     }
 129   else
 130     {
 131       subnet_list[subnet->type] = subnet->global_next;
 132     }
 133
 134   subnet->global_next->global_prev = subnet->global_prev;
 135
 136   free_subnet(subnet);
 137 cp
 138 }
 139
 140 /* Ascii representation of subnets */
 141
 142 subnet_t *str2net(char *subnetstr)
 143 {
 144   int type;
 145   subnet_t *subnet;
 146 cp
 147   if(sscanf(subnetstr, "%d,", &type) != 1)
 148     return NULL;
 149
 150   subnet = new_subnet();
 151
 152   switch(type)
 153     {
 154       case SUBNET_MAC:
 155         if(sscanf(subnetstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &subnet->type,
 156                    &subnet->net.mac.address.x[0],
 157                    &subnet->net.mac.address.x[1],
 158                    &subnet->net.mac.address.x[2],
 159                    &subnet->net.mac.address.x[3],
 160                    &subnet->net.mac.address.x[4],
 161                    &subnet->net.mac.address.x[5]) != 7)
 162           {
 163             free_subnet(subnet);
 164             return NULL;
 165           }
 166         break;
 167       case SUBNET_IPV4:
 168         if(sscanf(subnetstr, "%d,%lx/%lx", &subnet->type, &subnet->net.ipv4.address, &subnet->net.ipv4.mask) != 3)
 169           {
 170             free_subnet(subnet);
 171             return NULL;
 172           }
 173         break;
 174       case SUBNET_IPV6:
 175         if(sscanf(subnetstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", &subnet->type,
 176                    &subnet->net.ipv6.address.x[0],
 177                    &subnet->net.ipv6.address.x[1],
 178                    &subnet->net.ipv6.address.x[2],
 179                    &subnet->net.ipv6.address.x[3],
 180                    &subnet->net.ipv6.address.x[4],
 181                    &subnet->net.ipv6.address.x[5],
 182                    &subnet->net.ipv6.address.x[6],
 183                    &subnet->net.ipv6.address.x[7],
 184                    &subnet->net.ipv6.mask.x[0],
 185                    &subnet->net.ipv6.mask.x[1],
 186                    &subnet->net.ipv6.mask.x[2],
 187                    &subnet->net.ipv6.mask.x[3],
 188                    &subnet->net.ipv6.mask.x[4],
 189                    &subnet->net.ipv6.mask.x[5],
 190                    &subnet->net.ipv6.mask.x[6],
 191                    &subnet->net.ipv6.mask.x[7]) != 17)
 192           {
 193             free_subnet(subnet);
 194             return NULL;
 195           }
 196         break;
 197                 break;
 198       default:
 199         free_subnet(subnet);
 200         return NULL;
 201     }
 202 cp
 203   return subnet;
 204 }
 205
 206 char *net2str(subnet_t *subnet)
 207 {
 208   char *netstr;
 209 cp
 210   switch(subnet->type)
 211     {
 212       case SUBNET_MAC:
 213         asprintf(&netstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", subnet->type,
 214                    subnet->net.mac.address.x[0],
 215                    subnet->net.mac.address.x[1],
 216                    subnet->net.mac.address.x[2],
 217                    subnet->net.mac.address.x[3],
 218                    subnet->net.mac.address.x[4],
 219                    subnet->net.mac.address.x[5]);
 220       case SUBNET_IPV4:
 221         asprintf(&netstr, "%d,%lx/%lx", subnet->type, subnet->net.ipv4.address, subnet->net.ipv4.mask);
 222       case SUBNET_IPV6:
 223         asprintf(&netstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx",
 224                    subnet->net.ipv6.address.x[0],
 225                    subnet->net.ipv6.address.x[1],
 226                    subnet->net.ipv6.address.x[2],
 227                    subnet->net.ipv6.address.x[3],
 228                    subnet->net.ipv6.address.x[4],
 229                    subnet->net.ipv6.address.x[5],
 230                    subnet->net.ipv6.address.x[6],
 231                    subnet->net.ipv6.address.x[7],
 232                    subnet->net.ipv6.mask.x[0],
 233                    subnet->net.ipv6.mask.x[1],
 234                    subnet->net.ipv6.mask.x[2],
 235                    subnet->net.ipv6.mask.x[3],
 236                    subnet->net.ipv6.mask.x[4],
 237                    subnet->net.ipv6.mask.x[5],
 238                    subnet->net.ipv6.mask.x[6],
 239                    subnet->net.ipv6.mask.x[7]);
 240       default:
 241         netstr = NULL;
 242     }
 243 cp
 244   return netstr;
 245 }
 246
 247 /* Subnet lookup routines */
 248
 249 subnet_t *lookup_subnet_mac(mac_t address)
 250 {
 251   subnet_t *subnet;
 252 cp
 253   for(subnet = subnet_list[SUBNET_MAC]; subnet != NULL; subnet = subnet->next)
 254     {
 255       if(memcmp(&address, &subnet->net.mac.address, sizeof(address)) == 0)
 256         break;
 257     }
 258 cp
 259   return subnet;
 260 }
 261
 262 subnet_t *lookup_subnet_ipv4(ipv4_t address)
 263 {
 264   subnet_t *subnet;
 265 cp
 266   for(subnet = subnet_list[SUBNET_IPV4]; subnet != NULL; subnet = subnet->next)
 267     {
 268       if((address & subnet->net.ipv4.mask) == subnet->net.ipv4.address)
 269         break;
 270     }
 271 cp
 272   return subnet;
 273 }
 274
 275 subnet_t *lookup_subnet_ipv6(ipv6_t address)
 276 {
 277   subnet_t *subnet;
 278   int i;
 279 cp
 280   for(subnet = subnet_list[SUBNET_IPV6]; subnet != NULL; subnet = subnet->next)
 281     {
 282       for(i=0; i<8; i++)
 283         if((address.x[i] & subnet->net.ipv6.mask.x[i]) != subnet->net.ipv6.address.x[i])
 284           break;
 285       if(i=8)
 286         break;
 287     }
 288 cp
 289   return subnet;
 290 }