/*
subnet.c -- handle subnet lookups and lists
- Copyright (C) 2000-2003 Guus Sliepen <guus@sliepen.eu.org>,
- 2000-2003 Ivo Timmermans <ivo@o2w.nl>
+ Copyright (C) 2000-2017 Guus Sliepen <guus@tinc-vpn.org>,
+ 2000-2005 Ivo Timmermans
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id: subnet.c,v 1.1.2.48 2003/07/24 12:08:16 guus Exp $
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "system.h"
-#include "avl_tree.h"
+#include "splay_tree.h"
+#include "control_common.h"
+#include "device.h"
+#include "hash.h"
#include "logger.h"
+#include "names.h"
#include "net.h"
#include "netutl.h"
#include "node.h"
+#include "script.h"
#include "subnet.h"
#include "utils.h"
#include "xalloc.h"
/* lists type of subnet */
-avl_tree_t *subnet_tree;
-
-/* Subnet comparison */
-
-static int subnet_compare_mac(const subnet_t *a, const subnet_t *b)
-{
- int result;
-
- result = memcmp(&a->net.mac.address, &b->net.mac.address, sizeof(mac_t));
-
- if(result || !a->owner || !b->owner)
- return result;
-
- return strcmp(a->owner->name, b->owner->name);
-}
-
-static int subnet_compare_ipv4(const subnet_t *a, const subnet_t *b)
-{
- int result;
-
- result = memcmp(&a->net.ipv4.address, &b->net.ipv4.address, sizeof(ipv4_t));
-
- if(result)
- return result;
+splay_tree_t *subnet_tree;
- result = a->net.ipv4.prefixlength - b->net.ipv4.prefixlength;
+/* Subnet lookup cache */
- if(result || !a->owner || !b->owner)
- return result;
+static hash_t *ipv4_cache;
+static hash_t *ipv6_cache;
+static hash_t *mac_cache;
- return strcmp(a->owner->name, b->owner->name);
-}
-
-static int subnet_compare_ipv6(const subnet_t *a, const subnet_t *b)
-{
- int result;
-
- result = memcmp(&a->net.ipv6.address, &b->net.ipv6.address, sizeof(ipv6_t));
-
- if(result)
- return result;
-
- result = a->net.ipv6.prefixlength - b->net.ipv6.prefixlength;
-
- if(result || !a->owner || !b->owner)
- return result;
-
- return strcmp(a->owner->name, b->owner->name);
-}
-
-static int subnet_compare(const subnet_t *a, const subnet_t *b)
-{
- int result;
-
- result = a->type - b->type;
-
- if(result)
- return result;
-
- switch (a->type) {
- case SUBNET_MAC:
- return subnet_compare_mac(a, b);
- case SUBNET_IPV4:
- return subnet_compare_ipv4(a, b);
- case SUBNET_IPV6:
- return subnet_compare_ipv6(a, b);
- default:
- logger(LOG_ERR, _("subnet_compare() was called with unknown subnet type %d, exitting!"),
- a->type);
- cp_trace();
- exit(0);
- }
-
- return 0;
+void subnet_cache_flush(void) {
+ hash_clear(ipv4_cache);
+ hash_clear(ipv6_cache);
+ hash_clear(mac_cache);
}
/* Initialising trees */
-void init_subnets(void)
-{
- cp();
+void init_subnets(void) {
+ subnet_tree = splay_alloc_tree((splay_compare_t) subnet_compare, (splay_action_t) free_subnet);
- subnet_tree = avl_alloc_tree((avl_compare_t) subnet_compare, (avl_action_t) free_subnet);
+ ipv4_cache = hash_alloc(0x100, sizeof(ipv4_t));
+ ipv6_cache = hash_alloc(0x100, sizeof(ipv6_t));
+ mac_cache = hash_alloc(0x100, sizeof(mac_t));
}
-void exit_subnets(void)
-{
- cp();
+void exit_subnets(void) {
+ splay_delete_tree(subnet_tree);
- avl_delete_tree(subnet_tree);
+ hash_free(ipv4_cache);
+ hash_free(ipv6_cache);
+ hash_free(mac_cache);
}
-avl_tree_t *new_subnet_tree(void)
-{
- cp();
-
- return avl_alloc_tree((avl_compare_t) subnet_compare, NULL);
+splay_tree_t *new_subnet_tree(void) {
+ return splay_alloc_tree((splay_compare_t) subnet_compare, NULL);
}
-void free_subnet_tree(avl_tree_t *subnet_tree)
-{
- cp();
-
- avl_delete_tree(subnet_tree);
+void free_subnet_tree(splay_tree_t *subnet_tree) {
+ splay_delete_tree(subnet_tree);
}
/* Allocating and freeing space for subnets */
-subnet_t *new_subnet(void)
-{
- cp();
-
- return (subnet_t *) xmalloc_and_zero(sizeof(subnet_t));
+subnet_t *new_subnet(void) {
+ return xzalloc(sizeof(subnet_t));
}
-void free_subnet(subnet_t *subnet)
-{
- cp();
-
+void free_subnet(subnet_t *subnet) {
free(subnet);
}
/* Adding and removing subnets */
-void subnet_add(node_t *n, subnet_t *subnet)
-{
- cp();
-
+void subnet_add(node_t *n, subnet_t *subnet) {
subnet->owner = n;
- avl_insert(subnet_tree, subnet);
- avl_insert(n->subnet_tree, subnet);
-}
+ splay_insert(subnet_tree, subnet);
-void subnet_del(node_t *n, subnet_t *subnet)
-{
- cp();
+ if(n) {
+ splay_insert(n->subnet_tree, subnet);
+ }
- avl_delete(n->subnet_tree, subnet);
- avl_delete(subnet_tree, subnet);
+ subnet_cache_flush();
}
-/* Ascii representation of subnets */
+void subnet_del(node_t *n, subnet_t *subnet) {
+ if(n) {
+ splay_delete(n->subnet_tree, subnet);
+ }
-subnet_t *str2net(const char *subnetstr)
-{
- int i, l;
- subnet_t *subnet;
- uint16_t x[8];
+ splay_delete(subnet_tree, subnet);
- cp();
+ subnet_cache_flush();
+}
- subnet = new_subnet();
+/* Subnet lookup routines */
+
+subnet_t *lookup_subnet(const node_t *owner, const subnet_t *subnet) {
+ return splay_search(owner->subnet_tree, subnet);
+}
- if(sscanf(subnetstr, "%hu.%hu.%hu.%hu/%d",
- &x[0], &x[1], &x[2], &x[3], &l) == 5) {
- subnet->type = SUBNET_IPV4;
- subnet->net.ipv4.prefixlength = l;
+subnet_t *lookup_subnet_mac(const node_t *owner, const mac_t *address) {
+ subnet_t *r = NULL;
- for(i = 0; i < 4; i++)
- subnet->net.ipv4.address.x[i] = x[i];
+ // Check if this address is cached
- return subnet;
+ if((r = hash_search(mac_cache, address))) {
+ return r;
}
- if(sscanf(subnetstr, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%d",
- &x[0], &x[1], &x[2], &x[3], &x[4], &x[5], &x[6], &x[7],
- &l) == 9) {
- subnet->type = SUBNET_IPV6;
- subnet->net.ipv6.prefixlength = l;
+ // Search all subnets for a matching one
- for(i = 0; i < 8; i++)
- subnet->net.ipv6.address.x[i] = htons(x[i]);
+ for splay_each(subnet_t, p, owner ? owner->subnet_tree : subnet_tree) {
+ if(!p || p->type != SUBNET_MAC) {
+ continue;
+ }
- return subnet;
- }
+ if(!memcmp(address, &p->net.mac.address, sizeof(*address))) {
+ r = p;
- if(sscanf(subnetstr, "%hu.%hu.%hu.%hu", &x[0], &x[1], &x[2], &x[3]) == 4) {
- subnet->type = SUBNET_IPV4;
- subnet->net.ipv4.prefixlength = 32;
+ if(!p->owner || p->owner->status.reachable) {
+ break;
+ }
+ }
+ }
- for(i = 0; i < 4; i++)
- subnet->net.ipv4.address.x[i] = x[i];
+ // Cache the result
- return subnet;
+ if(r) {
+ hash_insert(mac_cache, address, r);
}
- if(sscanf(subnetstr, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx",
- &x[0], &x[1], &x[2], &x[3], &x[4], &x[5], &x[6], &x[7]) == 8) {
- subnet->type = SUBNET_IPV6;
- subnet->net.ipv6.prefixlength = 128;
+ return r;
+}
+
+subnet_t *lookup_subnet_ipv4(const ipv4_t *address) {
+ subnet_t *r = NULL;
- for(i = 0; i < 8; i++)
- subnet->net.ipv6.address.x[i] = htons(x[i]);
+ // Check if this address is cached
- return subnet;
+ if((r = hash_search(ipv4_cache, address))) {
+ return r;
}
- if(sscanf(subnetstr, "%hx:%hx:%hx:%hx:%hx:%hx",
- &x[0], &x[1], &x[2], &x[3], &x[4], &x[5]) == 6) {
- subnet->type = SUBNET_MAC;
+ // Search all subnets for a matching one
- for(i = 0; i < 6; i++)
- subnet->net.mac.address.x[i] = x[i];
+ for splay_each(subnet_t, p, subnet_tree) {
+ if(!p || p->type != SUBNET_IPV4) {
+ continue;
+ }
- return subnet;
- }
+ if(!maskcmp(address, &p->net.ipv4.address, p->net.ipv4.prefixlength)) {
+ r = p;
- free(subnet);
+ if(!p->owner || p->owner->status.reachable) {
+ break;
+ }
+ }
+ }
- return NULL;
-}
+ // Cache the result
-char *net2str(const subnet_t *subnet)
-{
- char *netstr;
-
- cp();
-
- switch (subnet->type) {
- case SUBNET_MAC:
- asprintf(&netstr, "%hx:%hx:%hx:%hx:%hx:%hx",
- subnet->net.mac.address.x[0],
- subnet->net.mac.address.x[1],
- subnet->net.mac.address.x[2],
- subnet->net.mac.address.x[3],
- subnet->net.mac.address.x[4], subnet->net.mac.address.x[5]);
- break;
-
- case SUBNET_IPV4:
- asprintf(&netstr, "%hu.%hu.%hu.%hu/%d",
- subnet->net.ipv4.address.x[0],
- subnet->net.ipv4.address.x[1],
- subnet->net.ipv4.address.x[2],
- subnet->net.ipv4.address.x[3], subnet->net.ipv4.prefixlength);
- break;
-
- case SUBNET_IPV6:
- asprintf(&netstr, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%d",
- ntohs(subnet->net.ipv6.address.x[0]),
- ntohs(subnet->net.ipv6.address.x[1]),
- ntohs(subnet->net.ipv6.address.x[2]),
- ntohs(subnet->net.ipv6.address.x[3]),
- ntohs(subnet->net.ipv6.address.x[4]),
- ntohs(subnet->net.ipv6.address.x[5]),
- ntohs(subnet->net.ipv6.address.x[6]),
- ntohs(subnet->net.ipv6.address.x[7]),
- subnet->net.ipv6.prefixlength);
- break;
-
- default:
- logger(LOG_ERR,
- _("net2str() was called with unknown subnet type %d, exiting!"),
- subnet->type);
- cp_trace();
- exit(0);
+ if(r) {
+ hash_insert(ipv4_cache, address, r);
}
- return netstr;
+ return r;
}
-/* Subnet lookup routines */
+subnet_t *lookup_subnet_ipv6(const ipv6_t *address) {
+ subnet_t *r = NULL;
-subnet_t *lookup_subnet(const node_t *owner, const subnet_t *subnet)
-{
- cp();
+ // Check if this address is cached
- return avl_search(owner->subnet_tree, subnet);
-}
+ if((r = hash_search(ipv6_cache, address))) {
+ return r;
+ }
-subnet_t *lookup_subnet_mac(const mac_t *address)
-{
- subnet_t subnet = {
- .type = SUBNET_MAC,
- .net.mac.address = *address,
- .owner = NULL
- };
- subnet_t *p;
+ // Search all subnets for a matching one
- cp();
+ for splay_each(subnet_t, p, subnet_tree) {
+ if(!p || p->type != SUBNET_IPV6) {
+ continue;
+ }
- p = (subnet_t *) avl_search(subnet_tree, &subnet);
+ if(!maskcmp(address, &p->net.ipv6.address, p->net.ipv6.prefixlength)) {
+ r = p;
- return p;
-}
-
-subnet_t *lookup_subnet_ipv4(const ipv4_t *address)
-{
- subnet_t subnet = {
- .type = SUBNET_IPV4,
- .net.ipv4.address = *address,
- .net.ipv4.prefixlength = 32,
- .owner = NULL
- };
- subnet_t *p;
+ if(!p->owner || p->owner->status.reachable) {
+ break;
+ }
+ }
+ }
- cp();
+ // Cache the result
- do {
- /* Go find subnet */
+ if(r) {
+ hash_insert(ipv6_cache, address, r);
+ }
- p = (subnet_t *) avl_search_closest_smaller(subnet_tree, &subnet);
+ return r;
+}
- /* Check if the found subnet REALLY matches */
+void subnet_update(node_t *owner, subnet_t *subnet, bool up) {
+ char netstr[MAXNETSTR];
+ char *name, *address, *port;
+ char empty[] = "";
- if(p) {
- if(p->type != SUBNET_IPV4) {
- p = NULL;
- break;
- }
+ // Prepare environment variables to be passed to the script
- if(!maskcmp(address, &p->net.ipv4.address, p->net.ipv4.prefixlength, sizeof(ipv4_t)))
- break;
- else {
- /* Otherwise, see if there is a bigger enclosing subnet */
+ environment_t env;
+ environment_init(&env);
+ environment_add(&env, "NODE=%s", owner->name);
- subnet.net.ipv4.prefixlength = p->net.ipv4.prefixlength - 1;
- maskcpy(&subnet.net.ipv4.address, &p->net.ipv4.address, subnet.net.ipv4.prefixlength, sizeof(ipv4_t));
- }
- }
- } while(p);
+ if(owner != myself) {
+ sockaddr2str(&owner->address, &address, &port);
+ environment_add(&env, "REMOTEADDRESS=%s", address);
+ environment_add(&env, "REMOTEPORT=%s", port);
+ free(port);
+ free(address);
+ }
- return p;
-}
+ int env_subnet = environment_add(&env, NULL);
+ int env_weight = environment_add(&env, NULL);
-subnet_t *lookup_subnet_ipv6(const ipv6_t *address)
-{
- subnet_t subnet = {
- .type = SUBNET_IPV6,
- .net.ipv6.address = *address,
- .net.ipv6.prefixlength = 128,
- .owner = NULL
- };
- subnet_t *p;
+ name = up ? "subnet-up" : "subnet-down";
- cp();
+ if(!subnet) {
+ for splay_each(subnet_t, subnet, owner->subnet_tree) {
+ if(!net2str(netstr, sizeof(netstr), subnet)) {
+ continue;
+ }
- do {
- /* Go find subnet */
+ // Strip the weight from the subnet, and put it in its own environment variable
+ char *weight = strchr(netstr, '#');
- p = (subnet_t *) avl_search_closest_smaller(subnet_tree, &subnet);
+ if(weight) {
+ *weight++ = 0;
+ } else {
+ weight = empty;
+ }
- /* Check if the found subnet REALLY matches */
+ // Prepare the SUBNET and WEIGHT variables
+ environment_update(&env, env_subnet, "SUBNET=%s", netstr);
+ environment_update(&env, env_weight, "WEIGHT=%s", weight);
- if(p) {
- if(p->type != SUBNET_IPV6)
- return NULL;
+ execute_script(name, &env);
+ }
+ } else {
+ if(net2str(netstr, sizeof(netstr), subnet)) {
+ // Strip the weight from the subnet, and put it in its own environment variable
+ char *weight = strchr(netstr, '#');
+
+ if(weight) {
+ *weight++ = 0;
+ } else {
+ weight = empty;
+ }
- if(!maskcmp(address, &p->net.ipv6.address, p->net.ipv6.prefixlength, sizeof(ipv6_t)))
- break;
- else {
- /* Otherwise, see if there is a bigger enclosing subnet */
+ // Prepare the SUBNET and WEIGHT variables
+ environment_update(&env, env_subnet, "SUBNET=%s", netstr);
+ environment_update(&env, env_weight, "WEIGHT=%s", weight);
- subnet.net.ipv6.prefixlength = p->net.ipv6.prefixlength - 1;
- maskcpy(&subnet.net.ipv6.address, &p->net.ipv6.address, subnet.net.ipv6.prefixlength, sizeof(ipv6_t));
- }
+ execute_script(name, &env);
}
- } while(p);
+ }
- return p;
+ environment_exit(&env);
}
-void dump_subnets(void)
-{
- char *netstr;
- subnet_t *subnet;
- avl_node_t *node;
+bool dump_subnets(connection_t *c) {
+ for splay_each(subnet_t, subnet, subnet_tree) {
+ char netstr[MAXNETSTR];
- cp();
-
- logger(LOG_DEBUG, _("Subnet list:"));
+ if(!net2str(netstr, sizeof(netstr), subnet)) {
+ continue;
+ }
- for(node = subnet_tree->head; node; node = node->next) {
- subnet = (subnet_t *) node->data;
- netstr = net2str(subnet);
- logger(LOG_DEBUG, _(" %s owner %s"), netstr, subnet->owner->name);
- free(netstr);
+ send_request(c, "%d %d %s %s",
+ CONTROL, REQ_DUMP_SUBNETS,
+ netstr, subnet->owner ? subnet->owner->name : "(broadcast)");
}
- logger(LOG_DEBUG, _("End of subnet list."));
+ return send_request(c, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
}