git.meshlink.io Git - meshlink/blob - src/subnet.c

   1 /*
   2     subnet.c -- handle subnet lookups and lists
   3     Copyright (C) 2000-2013 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 "names.h"
  28 #include "net.h"
  29 #include "netutl.h"
  30 #include "node.h"
  31 #include "script.h"
  32 #include "subnet.h"
  33 #include "utils.h"
  34 #include "xalloc.h"
  35
  36 /* lists type of subnet */
  37
  38 splay_tree_t *subnet_tree;
  39
  40 /* Subnet lookup cache */
  41
  42 hash_t *ipv4_cache;
  43 hash_t *ipv6_cache;
  44 hash_t *mac_cache;
  45
  46 void subnet_cache_flush(void) {
  47         hash_clear(ipv4_cache);
  48         hash_clear(ipv6_cache);
  49         hash_clear(mac_cache);
  50 }
  51
  52 /* Initialising trees */
  53
  54 void init_subnets(void) {
  55         subnet_tree = splay_alloc_tree((splay_compare_t) subnet_compare, (splay_action_t) free_subnet);
  56
  57         ipv4_cache = hash_alloc(0x100, sizeof(ipv4_t));
  58         ipv6_cache = hash_alloc(0x100, sizeof(ipv6_t));
  59         mac_cache = hash_alloc(0x100, sizeof(mac_t));
  60 }
  61
  62 void exit_subnets(void) {
  63         splay_delete_tree(subnet_tree);
  64
  65         hash_free(ipv4_cache);
  66         hash_free(ipv6_cache);
  67         hash_free(mac_cache);
  68 }
  69
  70 splay_tree_t *new_subnet_tree(void) {
  71         return splay_alloc_tree((splay_compare_t) subnet_compare, NULL);
  72 }
  73
  74 void free_subnet_tree(splay_tree_t *subnet_tree) {
  75         splay_delete_tree(subnet_tree);
  76 }
  77
  78 /* Allocating and freeing space for subnets */
  79
  80 subnet_t *new_subnet(void) {
  81         return xzalloc(sizeof(subnet_t));
  82 }
  83
  84 void free_subnet(subnet_t *subnet) {
  85         free(subnet);
  86 }
  87
  88 /* Adding and removing subnets */
  89
  90 void subnet_add(node_t *n, subnet_t *subnet) {
  91         subnet->owner = n;
  92
  93         splay_insert(subnet_tree, subnet);
  94         splay_insert(n->subnet_tree, subnet);
  95
  96         subnet_cache_flush();
  97 }
  98
  99 void subnet_del(node_t *n, subnet_t *subnet) {
 100         splay_delete(n->subnet_tree, subnet);
 101         splay_delete(subnet_tree, subnet);
 102
 103         subnet_cache_flush();
 104 }
 105
 106 /* Subnet lookup routines */
 107
 108 subnet_t *lookup_subnet(const node_t *owner, const subnet_t *subnet) {
 109         return splay_search(owner->subnet_tree, subnet);
 110 }
 111
 112 subnet_t *lookup_subnet_mac(const node_t *owner, const mac_t *address) {
 113         subnet_t *r = NULL;
 114
 115         // Check if this address is cached
 116
 117         if((r = hash_search(mac_cache, address)))
 118                 return r;
 119
 120         // Search all subnets for a matching one
 121
 122         for splay_each(subnet_t, p, owner ? owner->subnet_tree : subnet_tree) {
 123                 if(!p || p->type != SUBNET_MAC)
 124                         continue;
 125
 126                 if(!memcmp(address, &p->net.mac.address, sizeof *address)) {
 127                         r = p;
 128                         if(p->owner->status.reachable)
 129                                 break;
 130                 }
 131         }
 132
 133         // Cache the result
 134
 135         if(r)
 136                 hash_insert(mac_cache, address, r);
 137
 138         return r;
 139 }
 140
 141 subnet_t *lookup_subnet_ipv4(const ipv4_t *address) {
 142         subnet_t *r = NULL;
 143
 144         // Check if this address is cached
 145
 146         if((r = hash_search(ipv4_cache, address)))
 147                 return r;
 148
 149         // Search all subnets for a matching one
 150
 151         for splay_each(subnet_t, p, subnet_tree) {
 152                 if(!p || p->type != SUBNET_IPV4)
 153                         continue;
 154
 155                 if(!maskcmp(address, &p->net.ipv4.address, p->net.ipv4.prefixlength)) {
 156                         r = p;
 157                         if(p->owner->status.reachable)
 158                                 break;
 159                 }
 160         }
 161
 162         // Cache the result
 163
 164         if(r)
 165                 hash_insert(ipv4_cache, address, r);
 166
 167         return r;
 168 }
 169
 170 subnet_t *lookup_subnet_ipv6(const ipv6_t *address) {
 171         subnet_t *r = NULL;
 172
 173         // Check if this address is cached
 174
 175         if((r = hash_search(ipv6_cache, address)))
 176                 return r;
 177
 178         // Search all subnets for a matching one
 179
 180         for splay_each(subnet_t, p, subnet_tree) {
 181                 if(!p || p->type != SUBNET_IPV6)
 182                         continue;
 183
 184                 if(!maskcmp(address, &p->net.ipv6.address, p->net.ipv6.prefixlength)) {
 185                         r = p;
 186                         if(p->owner->status.reachable)
 187                                 break;
 188                 }
 189         }
 190
 191         // Cache the result
 192
 193         if(r)
 194                 hash_insert(ipv6_cache, address, r);
 195
 196         return r;
 197 }
 198
 199 void subnet_update(node_t *owner, subnet_t *subnet, bool up) {
 200         char netstr[MAXNETSTR];
 201         char *name, *address, *port;
 202         char empty[] = "";
 203
 204         // Prepare environment variables to be passed to the script
 205
 206         char *envp[10] = {NULL};
 207         xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
 208         xasprintf(&envp[3], "NODE=%s", owner->name);
 209
 210         if(owner != myself) {
 211                 sockaddr2str(&owner->address, &address, &port);
 212                 // 4 and 5 are reserved for SUBNET and WEIGHT
 213                 xasprintf(&envp[6], "REMOTEADDRESS=%s", address);
 214                 xasprintf(&envp[7], "REMOTEPORT=%s", port);
 215                 free(port);
 216                 free(address);
 217         }
 218
 219         xasprintf(&envp[8], "NAME=%s", myself->name);
 220
 221         name = up ? "subnet-up" : "subnet-down";
 222
 223         if(!subnet) {
 224                 for splay_each(subnet_t, subnet, owner->subnet_tree) {
 225                         if(!net2str(netstr, sizeof netstr, subnet))
 226                                 continue;
 227
 228                         // Strip the weight from the subnet, and put it in its own environment variable
 229                         char *weight = strchr(netstr, '#');
 230                         if(weight)
 231                                 *weight++ = 0;
 232                         else
 233                                 weight = empty;
 234
 235                         // Prepare the SUBNET and WEIGHT variables
 236                         if(envp[4])
 237                                 free(envp[4]);
 238                         if(envp[5])
 239                                 free(envp[5]);
 240                         xasprintf(&envp[4], "SUBNET=%s", netstr);
 241                         xasprintf(&envp[5], "WEIGHT=%s", weight);
 242
 243                         execute_script(name, envp);
 244                 }
 245         } else {
 246                 if(net2str(netstr, sizeof netstr, subnet)) {
 247                         // Strip the weight from the subnet, and put it in its own environment variable
 248                         char *weight = strchr(netstr, '#');
 249                         if(weight)
 250                                 *weight++ = 0;
 251                         else
 252                                 weight = empty;
 253
 254                         // Prepare the SUBNET and WEIGHT variables
 255                         xasprintf(&envp[4], "SUBNET=%s", netstr);
 256                         xasprintf(&envp[5], "WEIGHT=%s", weight);
 257
 258                         execute_script(name, envp);
 259                 }
 260         }
 261
 262         for(int i = 0; envp[i] && i < 9; i++)
 263                 free(envp[i]);
 264 }
 265
 266 bool dump_subnets(connection_t *c) {
 267         for splay_each(subnet_t, subnet, subnet_tree) {
 268                 char netstr[MAXNETSTR];
 269
 270                 if(!net2str(netstr, sizeof netstr, subnet))
 271                         continue;
 272
 273                 send_request(c, "%d %d %s %s",
 274                                 CONTROL, REQ_DUMP_SUBNETS,
 275                                 netstr, subnet->owner->name);
 276         }
 277
 278         return send_request(c, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
 279 }