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

   1 /*
   2     subnet.c -- handle subnet lookups and lists
   3     Copyright (C) 2000-2017 Guus Sliepen <guus@tinc-vpn.org>,
   4                   2000-2005 Ivo Timmermans
   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 along
  17     with this program; if not, write to the Free Software Foundation, Inc.,
  18     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19 */
  20
  21 #include "system.h"
  22
  23 #include "splay_tree.h"
  24 #include "control_common.h"
  25 #include "hash.h"
  26 #include "logger.h"
  27 #include "net.h"
  28 #include "netutl.h"
  29 #include "node.h"
  30 #include "script.h"
  31 #include "subnet.h"
  32 #include "xalloc.h"
  33
  34 /* lists type of subnet */
  35
  36 splay_tree_t *subnet_tree;
  37
  38 /* Subnet lookup cache */
  39
  40 static hash_t *ipv4_cache;
  41 static hash_t *ipv6_cache;
  42 static hash_t *mac_cache;
  43
  44 void subnet_cache_flush(void) {
  45         hash_clear(ipv4_cache);
  46         hash_clear(ipv6_cache);
  47         hash_clear(mac_cache);
  48 }
  49
  50 /* Initialising trees */
  51
  52 void init_subnets(void) {
  53         subnet_tree = splay_alloc_tree((splay_compare_t) subnet_compare, (splay_action_t) free_subnet);
  54
  55         ipv4_cache = hash_alloc(0x100, sizeof(ipv4_t));
  56         ipv6_cache = hash_alloc(0x100, sizeof(ipv6_t));
  57         mac_cache = hash_alloc(0x100, sizeof(mac_t));
  58 }
  59
  60 void exit_subnets(void) {
  61         splay_delete_tree(subnet_tree);
  62
  63         hash_free(ipv4_cache);
  64         hash_free(ipv6_cache);
  65         hash_free(mac_cache);
  66 }
  67
  68 splay_tree_t *new_subnet_tree(void) {
  69         return splay_alloc_tree((splay_compare_t) subnet_compare, NULL);
  70 }
  71
  72 void free_subnet_tree(splay_tree_t *subnet_tree) {
  73         splay_delete_tree(subnet_tree);
  74 }
  75
  76 /* Allocating and freeing space for subnets */
  77
  78 subnet_t *new_subnet(void) {
  79         return xzalloc(sizeof(subnet_t));
  80 }
  81
  82 void free_subnet(subnet_t *subnet) {
  83         free(subnet);
  84 }
  85
  86 /* Adding and removing subnets */
  87
  88 void subnet_add(node_t *n, subnet_t *subnet) {
  89         subnet->owner = n;
  90
  91         splay_insert(subnet_tree, subnet);
  92
  93         if(n) {
  94                 splay_insert(n->subnet_tree, subnet);
  95         }
  96
  97         subnet_cache_flush();
  98 }
  99
 100 void subnet_del(node_t *n, subnet_t *subnet) {
 101         if(n) {
 102                 splay_delete(n->subnet_tree, subnet);
 103         }
 104
 105         splay_delete(subnet_tree, subnet);
 106
 107         subnet_cache_flush();
 108 }
 109
 110 /* Subnet lookup routines */
 111
 112 subnet_t *lookup_subnet(const node_t *owner, const subnet_t *subnet) {
 113         return splay_search(owner->subnet_tree, subnet);
 114 }
 115
 116 subnet_t *lookup_subnet_mac(const node_t *owner, const mac_t *address) {
 117         subnet_t *r = NULL;
 118
 119         // Check if this address is cached
 120
 121         if((r = hash_search(mac_cache, address))) {
 122                 return r;
 123         }
 124
 125         // Search all subnets for a matching one
 126
 127         for splay_each(subnet_t, p, owner ? owner->subnet_tree : subnet_tree) {
 128                 if(!p || p->type != SUBNET_MAC) {
 129                         continue;
 130                 }
 131
 132                 if(!memcmp(address, &p->net.mac.address, sizeof(*address))) {
 133                         r = p;
 134
 135                         if(!p->owner || p->owner->status.reachable) {
 136                                 break;
 137                         }
 138                 }
 139         }
 140
 141         // Cache the result
 142
 143         if(r) {
 144                 hash_insert(mac_cache, address, r);
 145         }
 146
 147         return r;
 148 }
 149
 150 subnet_t *lookup_subnet_ipv4(const ipv4_t *address) {
 151         subnet_t *r = NULL;
 152
 153         // Check if this address is cached
 154
 155         if((r = hash_search(ipv4_cache, address))) {
 156                 return r;
 157         }
 158
 159         // Search all subnets for a matching one
 160
 161         for splay_each(subnet_t, p, subnet_tree) {
 162                 if(!p || p->type != SUBNET_IPV4) {
 163                         continue;
 164                 }
 165
 166                 if(!maskcmp(address, &p->net.ipv4.address, p->net.ipv4.prefixlength)) {
 167                         r = p;
 168
 169                         if(!p->owner || p->owner->status.reachable) {
 170                                 break;
 171                         }
 172                 }
 173         }
 174
 175         // Cache the result
 176
 177         if(r) {
 178                 hash_insert(ipv4_cache, address, r);
 179         }
 180
 181         return r;
 182 }
 183
 184 subnet_t *lookup_subnet_ipv6(const ipv6_t *address) {
 185         subnet_t *r = NULL;
 186
 187         // Check if this address is cached
 188
 189         if((r = hash_search(ipv6_cache, address))) {
 190                 return r;
 191         }
 192
 193         // Search all subnets for a matching one
 194
 195         for splay_each(subnet_t, p, subnet_tree) {
 196                 if(!p || p->type != SUBNET_IPV6) {
 197                         continue;
 198                 }
 199
 200                 if(!maskcmp(address, &p->net.ipv6.address, p->net.ipv6.prefixlength)) {
 201                         r = p;
 202
 203                         if(!p->owner || p->owner->status.reachable) {
 204                                 break;
 205                         }
 206                 }
 207         }
 208
 209         // Cache the result
 210
 211         if(r) {
 212                 hash_insert(ipv6_cache, address, r);
 213         }
 214
 215         return r;
 216 }
 217
 218 void subnet_update(node_t *owner, subnet_t *subnet, bool up) {
 219         char netstr[MAXNETSTR];
 220         char *name, *address, *port;
 221         char empty[] = "";
 222
 223         // Prepare environment variables to be passed to the script
 224
 225         environment_t env;
 226         environment_init(&env);
 227         environment_add(&env, "NODE=%s", owner->name);
 228
 229         if(owner != myself) {
 230                 sockaddr2str(&owner->address, &address, &port);
 231                 environment_add(&env, "REMOTEADDRESS=%s", address);
 232                 environment_add(&env, "REMOTEPORT=%s", port);
 233                 free(port);
 234                 free(address);
 235         }
 236
 237         int env_subnet = environment_add(&env, NULL);
 238         int env_weight = environment_add(&env, NULL);
 239
 240         name = up ? "subnet-up" : "subnet-down";
 241
 242         if(!subnet) {
 243                 for splay_each(subnet_t, subnet, owner->subnet_tree) {
 244                         if(!net2str(netstr, sizeof(netstr), subnet)) {
 245                                 continue;
 246                         }
 247
 248                         // Strip the weight from the subnet, and put it in its own environment variable
 249                         char *weight = strchr(netstr, '#');
 250
 251                         if(weight) {
 252                                 *weight++ = 0;
 253                         } else {
 254                                 weight = empty;
 255                         }
 256
 257                         // Prepare the SUBNET and WEIGHT variables
 258                         environment_update(&env, env_subnet, "SUBNET=%s", netstr);
 259                         environment_update(&env, env_weight, "WEIGHT=%s", weight);
 260
 261                         execute_script(name, &env);
 262                 }
 263         } else {
 264                 if(net2str(netstr, sizeof(netstr), subnet)) {
 265                         // Strip the weight from the subnet, and put it in its own environment variable
 266                         char *weight = strchr(netstr, '#');
 267
 268                         if(weight) {
 269                                 *weight++ = 0;
 270                         } else {
 271                                 weight = empty;
 272                         }
 273
 274                         // Prepare the SUBNET and WEIGHT variables
 275                         environment_update(&env, env_subnet, "SUBNET=%s", netstr);
 276                         environment_update(&env, env_weight, "WEIGHT=%s", weight);
 277
 278                         execute_script(name, &env);
 279                 }
 280         }
 281
 282         environment_exit(&env);
 283 }
 284
 285 bool dump_subnets(connection_t *c) {
 286         for splay_each(subnet_t, subnet, subnet_tree) {
 287                 char netstr[MAXNETSTR];
 288
 289                 if(!net2str(netstr, sizeof(netstr), subnet)) {
 290                         continue;
 291                 }
 292
 293                 send_request(c, "%d %d %s %s",
 294                              CONTROL, REQ_DUMP_SUBNETS,
 295                              netstr, subnet->owner ? subnet->owner->name : "(broadcast)");
 296         }
 297
 298         return send_request(c, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
 299 }