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 "device.h"
  26 #include "hash.h"
  27 #include "logger.h"
  28 #include "names.h"
  29 #include "net.h"
  30 #include "netutl.h"
  31 #include "node.h"
  32 #include "script.h"
  33 #include "subnet.h"
  34 #include "utils.h"
  35 #include "xalloc.h"
  36
  37 /* lists type of subnet */
  38
  39 splay_tree_t *subnet_tree;
  40
  41 /* Subnet lookup cache */
  42
  43 static hash_t *ipv4_cache;
  44 static hash_t *ipv6_cache;
  45 static hash_t *mac_cache;
  46
  47 void subnet_cache_flush(void) {
  48         hash_clear(ipv4_cache);
  49         hash_clear(ipv6_cache);
  50         hash_clear(mac_cache);
  51 }
  52
  53 /* Initialising trees */
  54
  55 void init_subnets(void) {
  56         subnet_tree = splay_alloc_tree((splay_compare_t) subnet_compare, (splay_action_t) free_subnet);
  57
  58         ipv4_cache = hash_alloc(0x100, sizeof(ipv4_t));
  59         ipv6_cache = hash_alloc(0x100, sizeof(ipv6_t));
  60         mac_cache = hash_alloc(0x100, sizeof(mac_t));
  61 }
  62
  63 void exit_subnets(void) {
  64         splay_delete_tree(subnet_tree);
  65
  66         hash_free(ipv4_cache);
  67         hash_free(ipv6_cache);
  68         hash_free(mac_cache);
  69 }
  70
  71 splay_tree_t *new_subnet_tree(void) {
  72         return splay_alloc_tree((splay_compare_t) subnet_compare, NULL);
  73 }
  74
  75 void free_subnet_tree(splay_tree_t *subnet_tree) {
  76         splay_delete_tree(subnet_tree);
  77 }
  78
  79 /* Allocating and freeing space for subnets */
  80
  81 subnet_t *new_subnet(void) {
  82         return xzalloc(sizeof(subnet_t));
  83 }
  84
  85 void free_subnet(subnet_t *subnet) {
  86         free(subnet);
  87 }
  88
  89 /* Adding and removing subnets */
  90
  91 void subnet_add(node_t *n, subnet_t *subnet) {
  92         subnet->owner = n;
  93
  94         splay_insert(subnet_tree, subnet);
  95
  96         if(n) {
  97                 splay_insert(n->subnet_tree, subnet);
  98         }
  99
 100         subnet_cache_flush();
 101 }
 102
 103 void subnet_del(node_t *n, subnet_t *subnet) {
 104         if(n) {
 105                 splay_delete(n->subnet_tree, subnet);
 106         }
 107
 108         splay_delete(subnet_tree, subnet);
 109
 110         subnet_cache_flush();
 111 }
 112
 113 /* Subnet lookup routines */
 114
 115 subnet_t *lookup_subnet(const node_t *owner, const subnet_t *subnet) {
 116         return splay_search(owner->subnet_tree, subnet);
 117 }
 118
 119 subnet_t *lookup_subnet_mac(const node_t *owner, const mac_t *address) {
 120         subnet_t *r = NULL;
 121
 122         // Check if this address is cached
 123
 124         if((r = hash_search(mac_cache, address))) {
 125                 return r;
 126         }
 127
 128         // Search all subnets for a matching one
 129
 130         for splay_each(subnet_t, p, owner ? owner->subnet_tree : subnet_tree) {
 131                 if(!p || p->type != SUBNET_MAC) {
 132                         continue;
 133                 }
 134
 135                 if(!memcmp(address, &p->net.mac.address, sizeof(*address))) {
 136                         r = p;
 137
 138                         if(!p->owner || p->owner->status.reachable) {
 139                                 break;
 140                         }
 141                 }
 142         }
 143
 144         // Cache the result
 145
 146         if(r) {
 147                 hash_insert(mac_cache, address, r);
 148         }
 149
 150         return r;
 151 }
 152
 153 subnet_t *lookup_subnet_ipv4(const ipv4_t *address) {
 154         subnet_t *r = NULL;
 155
 156         // Check if this address is cached
 157
 158         if((r = hash_search(ipv4_cache, address))) {
 159                 return r;
 160         }
 161
 162         // Search all subnets for a matching one
 163
 164         for splay_each(subnet_t, p, subnet_tree) {
 165                 if(!p || p->type != SUBNET_IPV4) {
 166                         continue;
 167                 }
 168
 169                 if(!maskcmp(address, &p->net.ipv4.address, p->net.ipv4.prefixlength)) {
 170                         r = p;
 171
 172                         if(!p->owner || p->owner->status.reachable) {
 173                                 break;
 174                         }
 175                 }
 176         }
 177
 178         // Cache the result
 179
 180         if(r) {
 181                 hash_insert(ipv4_cache, address, r);
 182         }
 183
 184         return r;
 185 }
 186
 187 subnet_t *lookup_subnet_ipv6(const ipv6_t *address) {
 188         subnet_t *r = NULL;
 189
 190         // Check if this address is cached
 191
 192         if((r = hash_search(ipv6_cache, address))) {
 193                 return r;
 194         }
 195
 196         // Search all subnets for a matching one
 197
 198         for splay_each(subnet_t, p, subnet_tree) {
 199                 if(!p || p->type != SUBNET_IPV6) {
 200                         continue;
 201                 }
 202
 203                 if(!maskcmp(address, &p->net.ipv6.address, p->net.ipv6.prefixlength)) {
 204                         r = p;
 205
 206                         if(!p->owner || p->owner->status.reachable) {
 207                                 break;
 208                         }
 209                 }
 210         }
 211
 212         // Cache the result
 213
 214         if(r) {
 215                 hash_insert(ipv6_cache, address, r);
 216         }
 217
 218         return r;
 219 }
 220
 221 void subnet_update(node_t *owner, subnet_t *subnet, bool up) {
 222         char netstr[MAXNETSTR];
 223         char *name, *address, *port;
 224         char empty[] = "";
 225
 226         // Prepare environment variables to be passed to the script
 227
 228         environment_t env;
 229         environment_init(&env);
 230         environment_add(&env, "NODE=%s", owner->name);
 231
 232         if(owner != myself) {
 233                 sockaddr2str(&owner->address, &address, &port);
 234                 environment_add(&env, "REMOTEADDRESS=%s", address);
 235                 environment_add(&env, "REMOTEPORT=%s", port);
 236                 free(port);
 237                 free(address);
 238         }
 239
 240         int env_subnet = environment_add(&env, NULL);
 241         int env_weight = environment_add(&env, NULL);
 242
 243         name = up ? "subnet-up" : "subnet-down";
 244
 245         if(!subnet) {
 246                 for splay_each(subnet_t, subnet, owner->subnet_tree) {
 247                         if(!net2str(netstr, sizeof(netstr), subnet)) {
 248                                 continue;
 249                         }
 250
 251                         // Strip the weight from the subnet, and put it in its own environment variable
 252                         char *weight = strchr(netstr, '#');
 253
 254                         if(weight) {
 255                                 *weight++ = 0;
 256                         } else {
 257                                 weight = empty;
 258                         }
 259
 260                         // Prepare the SUBNET and WEIGHT variables
 261                         environment_update(&env, env_subnet, "SUBNET=%s", netstr);
 262                         environment_update(&env, env_weight, "WEIGHT=%s", weight);
 263
 264                         execute_script(name, &env);
 265                 }
 266         } else {
 267                 if(net2str(netstr, sizeof(netstr), subnet)) {
 268                         // Strip the weight from the subnet, and put it in its own environment variable
 269                         char *weight = strchr(netstr, '#');
 270
 271                         if(weight) {
 272                                 *weight++ = 0;
 273                         } else {
 274                                 weight = empty;
 275                         }
 276
 277                         // Prepare the SUBNET and WEIGHT variables
 278                         environment_update(&env, env_subnet, "SUBNET=%s", netstr);
 279                         environment_update(&env, env_weight, "WEIGHT=%s", weight);
 280
 281                         execute_script(name, &env);
 282                 }
 283         }
 284
 285         environment_exit(&env);
 286 }
 287
 288 bool dump_subnets(connection_t *c) {
 289         for splay_each(subnet_t, subnet, subnet_tree) {
 290                 char netstr[MAXNETSTR];
 291
 292                 if(!net2str(netstr, sizeof(netstr), subnet)) {
 293                         continue;
 294                 }
 295
 296                 send_request(c, "%d %d %s %s",
 297                              CONTROL, REQ_DUMP_SUBNETS,
 298                              netstr, subnet->owner ? subnet->owner->name : "(broadcast)");
 299         }
 300
 301         return send_request(c, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
 302 }