X-Git-Url: https://git.librecmc.org/?p=oweals%2Ftinc.git;a=blobdiff_plain;f=src%2Fsubnet.c;h=154fd8048b16285ff79c8d8b3665ff72a5f84db4;hp=c7b2ed7e1c3a709b355a447e230a514a13160c48;hb=HEAD;hpb=d47d5932a3bbc4940aa6453ebfe617ef330783c8

diff --git a/src/subnet.c b/src/subnet.c
index c7b2ed7..154fd80 100644
--- a/src/subnet.c
+++ b/src/subnet.c
@@ -1,7 +1,7 @@
 /*
     subnet.c -- handle subnet lookups and lists
-    Copyright (C) 2000 Guus Sliepen <guus@sliepen.warande.net>,
-                  2000 Ivo Timmermans <itimmermans@bigfoot.com>
+    Copyright (C) 2000-2019 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
@@ -13,278 +13,653 @@
     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 1.1.2.6 2000/10/28 16:41:40 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 "config.h"
-#include <utils.h>
+#include "system.h"
 
-#include <xalloc.h>
-#include "subnet.h"
+#include "avl_tree.h"
+#include "device.h"
+#include "logger.h"
 #include "net.h"
+#include "netutl.h"
+#include "node.h"
+#include "process.h"
+#include "subnet.h"
+#include "utils.h"
+#include "xalloc.h"
 
 /* lists type of subnet */
 
-subnet_t *subnet_list[SUBNET_TYPES] = { NULL };
+avl_tree_t *subnet_tree;
+
+/* Subnet lookup cache */
+
+static ipv4_t cache_ipv4_address[2];
+static subnet_t *cache_ipv4_subnet[2];
+static bool cache_ipv4_valid[2];
+static int cache_ipv4_slot;
+
+static ipv6_t cache_ipv6_address[2];
+static subnet_t *cache_ipv6_subnet[2];
+static bool cache_ipv6_valid[2];
+static int cache_ipv6_slot;
+
+static mac_t cache_mac_address[2];
+static subnet_t *cache_mac_subnet[2];
+static bool cache_mac_valid[2];
+static int cache_mac_slot;
+
+void subnet_cache_flush(void) {
+	cache_ipv4_valid[0] = cache_ipv4_valid[1] = false;
+	cache_ipv6_valid[0] = cache_ipv6_valid[1] = false;
+	cache_mac_valid[0] = cache_mac_valid[1] = false;
+}
+
+/* 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) {
+		return result;
+	}
+
+	result = a->weight - b->weight;
+
+	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 = b->net.ipv4.prefixlength - a->net.ipv4.prefixlength;
+
+	if(result) {
+		return result;
+	}
+
+	result = memcmp(&a->net.ipv4.address, &b->net.ipv4.address, sizeof(ipv4_t));
+
+	if(result) {
+		return result;
+	}
+
+	result = a->weight - b->weight;
+
+	if(result || !a->owner || !b->owner) {
+		return result;
+	}
+
+	return strcmp(a->owner->name, b->owner->name);
+}
+
+static int subnet_compare_ipv6(const subnet_t *a, const subnet_t *b) {
+	int result;
+
+	result = b->net.ipv6.prefixlength - a->net.ipv6.prefixlength;
+
+	if(result) {
+		return result;
+	}
+
+	result = memcmp(&a->net.ipv6.address, &b->net.ipv6.address, sizeof(ipv6_t));
+
+	if(result) {
+		return result;
+	}
+
+	result = a->weight - b->weight;
+
+	if(result || !a->owner || !b->owner) {
+		return result;
+	}
+
+	return strcmp(a->owner->name, b->owner->name);
+}
+
+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);
+		exit(0);
+	}
+
+	return 0;
+}
+
+/* Initialising trees */
+
+void init_subnets(void) {
+	subnet_tree = avl_alloc_tree((avl_compare_t) subnet_compare, (avl_action_t) free_subnet);
+
+	subnet_cache_flush();
+}
+
+void exit_subnets(void) {
+	avl_delete_tree(subnet_tree);
+}
+
+avl_tree_t *new_subnet_tree(void) {
+	return avl_alloc_tree((avl_compare_t) subnet_compare, NULL);
+}
+
+void free_subnet_tree(avl_tree_t *subnet_tree) {
+	avl_delete_tree(subnet_tree);
+}
 
 /* Allocating and freeing space for subnets */
 
-subnet_t *new_subnet(void)
-{
-cp
-  return (subnet_t *)xmalloc(sizeof(subnet_t));
+subnet_t *new_subnet(void) {
+	return xmalloc_and_zero(sizeof(subnet_t));
 }
 
-void free_subnet(subnet_t *subnet)
-{
-cp
-  free(subnet);
+void free_subnet(subnet_t *subnet) {
+	free(subnet);
 }
 
-/* Linked list management */
-
-void subnet_add(conn_list_t *cl, subnet_t *subnet)
-{
-  subnet_t *p = NULL;
-  subnet_t *q = NULL;
-cp
-  subnet->owner = cl;
-
-  /* Link it into the owners list of subnets (unsorted) */
-
-  subnet->next = cl->subnets->next;
-  subnet->prev = NULL;
-  if(subnet->next)
-    subnet->next->prev = subnet;
-  cl->subnets = subnet;
-  
-  /* And now add it to the global subnet list (sorted) */
-
-  /* Sort on size of subnet mask (IPv4 only at the moment!)
-  
-     Three cases: subnet_list[] = NULL -> just add this subnet
-                  insert before first -> add it in front of list
-                  rest: insert after another subnet
-   */
-
-  if(subnet_list[subnet->type])
-    {
-      p = q = subnet_list[subnet->type];
-
-      for(; p; p = p->global_next)
-        {
-          if(subnet->net.ipv4.mask >= p->net.ipv4.mask)
-            break;
-
-          q = p;
-        }
-     }
-  
-  if(!subnet_list[subnet->type] || p == subnet_list[subnet->type])  /* First two cases */
-    {
-      /* Insert in front */
-      subnet->global_next = subnet_list[subnet->type];
-      subnet->global_prev = NULL;
-      subnet_list[subnet->type] = subnet;
-    }
-  else                                  /* Third case */
-    {
-      /* Insert after q */
-      subnet->global_next = q->global_next;
-      subnet->global_prev = q;
-      q->global_next = subnet;
-    }
-
-  if(subnet->global_next)
-    subnet->global_next->global_prev = subnet;
-cp
+/* Adding and removing subnets */
+
+void subnet_add(node_t *n, subnet_t *subnet) {
+	subnet->owner = n;
+
+	avl_insert(subnet_tree, subnet);
+	avl_insert(n->subnet_tree, subnet);
+
+	subnet_cache_flush();
 }
 
-void subnet_del(subnet_t *subnet)
-{
-cp
-  /* Remove it from owner's list */
-
-  if(subnet->prev)
-    {
-      subnet->prev->next = subnet->next;
-    }
-  else
-    {
-      subnet->owner->subnets = subnet->next;
-    }
-
-  subnet->next->prev = subnet->prev;
-
-  /* Remove it from the global list */
-  
-  if(subnet->global_prev)
-    {
-      subnet->global_prev->global_next = subnet->global_next;
-    }
-  else
-    {
-      subnet_list[subnet->type] = subnet->global_next;
-    }
-
-  subnet->global_next->global_prev = subnet->global_prev;
-  
-  free_subnet(subnet);
-cp
+void subnet_del(node_t *n, subnet_t *subnet) {
+	avl_delete(n->subnet_tree, subnet);
+	avl_delete(subnet_tree, subnet);
+
+	subnet_cache_flush();
 }
 
 /* Ascii representation of subnets */
 
-subnet_t *str2net(char *subnetstr)
-{
-  int type;
-  subnet_t *subnet;
-cp
-  if(sscanf(subnetstr, "%d,", &type) != 1)
-    return NULL;
-
-  subnet = new_subnet();
-
-  switch(type)
-    {
-      case SUBNET_MAC:
-        if(sscanf(subnetstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &subnet->type,
-                   &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]) != 7)
-          {
-            free_subnet(subnet);
-            return NULL;
-          }
-        break;
-      case SUBNET_IPV4:
-        if(sscanf(subnetstr, "%d,%lx/%lx", &subnet->type, &subnet->net.ipv4.address, &subnet->net.ipv4.mask) != 3)
-          {
-            free_subnet(subnet);
-            return NULL;
-          }
-        break;
-      case SUBNET_IPV6:
-        if(sscanf(subnetstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", &subnet->type,
-                   &subnet->net.ipv6.address.x[0],
-                   &subnet->net.ipv6.address.x[1],
-                   &subnet->net.ipv6.address.x[2],
-                   &subnet->net.ipv6.address.x[3],
-                   &subnet->net.ipv6.address.x[4],
-                   &subnet->net.ipv6.address.x[5],
-                   &subnet->net.ipv6.address.x[6],
-                   &subnet->net.ipv6.address.x[7],
-                   &subnet->net.ipv6.mask.x[0],
-                   &subnet->net.ipv6.mask.x[1],
-                   &subnet->net.ipv6.mask.x[2],
-                   &subnet->net.ipv6.mask.x[3],
-                   &subnet->net.ipv6.mask.x[4],
-                   &subnet->net.ipv6.mask.x[5],
-                   &subnet->net.ipv6.mask.x[6],
-                   &subnet->net.ipv6.mask.x[7]) != 17)
-          {
-            free_subnet(subnet);
-            return NULL;
-          }
-        break;
-                break;
-      default:
-        free_subnet(subnet);
-        return NULL;
-    }
-cp
-  return subnet;
+bool str2net(subnet_t *subnet, const char *subnetstr) {
+	char str[1024];
+	strncpy(str, subnetstr, sizeof(str));
+	str[sizeof(str) - 1] = 0;
+	int consumed;
+
+	int weight = 10;
+	char *weight_separator = strchr(str, '#');
+
+	if(weight_separator) {
+		char *weight_str = weight_separator + 1;
+
+		if(sscanf(weight_str, "%d%n", &weight, &consumed) < 1) {
+			return false;
+		}
+
+		if(weight_str[consumed]) {
+			return false;
+		}
+
+		*weight_separator = 0;
+	}
+
+	int prefixlength = -1;
+	char *prefixlength_separator = strchr(str, '/');
+
+	if(prefixlength_separator) {
+		char *prefixlength_str = prefixlength_separator + 1;
+
+		if(sscanf(prefixlength_str, "%d%n", &prefixlength, &consumed) < 1) {
+			return false;
+		}
+
+		if(prefixlength_str[consumed]) {
+			return false;
+		}
+
+		*prefixlength_separator = 0;
+
+		if(prefixlength < 0) {
+			return false;
+		}
+	}
+
+	uint16_t x[8];
+
+	if(sscanf(str, "%hx:%hx:%hx:%hx:%hx:%hx%n", &x[0], &x[1], &x[2], &x[3], &x[4], &x[5], &consumed) >= 6 && !str[consumed]) {
+		/*
+		   Normally we should check that each part has two digits to prevent ambiguities.
+		   However, in old tinc versions net2str() will aggressively return MAC addresses with one-digit parts,
+		   so we have to accept them otherwise we would be unable to parse ADD_SUBNET messages.
+		*/
+		if(prefixlength >= 0) {
+			return false;
+		}
+
+		subnet->type = SUBNET_MAC;
+		subnet->weight = weight;
+
+		for(int i = 0; i < 6; i++) {
+			subnet->net.mac.address.x[i] = x[i];
+		}
+
+		return true;
+	}
+
+	if(sscanf(str, "%hu.%hu.%hu.%hu%n", &x[0], &x[1], &x[2], &x[3], &consumed) >= 4 && !str[consumed]) {
+		if(prefixlength == -1) {
+			prefixlength = 32;
+		}
+
+		if(prefixlength > 32) {
+			return false;
+		}
+
+		subnet->type = SUBNET_IPV4;
+		subnet->net.ipv4.prefixlength = prefixlength;
+		subnet->weight = weight;
+
+		for(int i = 0; i < 4; i++) {
+			if(x[i] > 255) {
+				return false;
+			}
+
+			subnet->net.ipv4.address.x[i] = x[i];
+		}
+
+		return true;
+	}
+
+	/* IPv6 */
+
+	char *last_colon = strrchr(str, ':');
+
+	if(last_colon && sscanf(last_colon, ":%hu.%hu.%hu.%hu%n", &x[0], &x[1], &x[2], &x[3], &consumed) >= 4 && !last_colon[consumed]) {
+		/* Dotted quad suffix notation, convert to standard IPv6 notation */
+		for(int i = 0; i < 4; i++)
+			if(x[i] > 255) {
+				return false;
+			}
+
+		snprintf(last_colon, sizeof(str) - (last_colon - str), ":%02x%02x:%02x%02x", x[0], x[1], x[2], x[3]);
+	}
+
+	char *double_colon = strstr(str, "::");
+
+	if(double_colon) {
+		/* Figure out how many zero groups we need to expand */
+		int zero_group_count = 8;
+
+		for(const char *cur = str; *cur; cur++)
+			if(*cur != ':') {
+				zero_group_count--;
+
+				while(cur[1] && cur[1] != ':') {
+					cur++;
+				}
+			}
+
+		if(zero_group_count < 1) {
+			return false;
+		}
+
+		/* Split the double colon in the middle to make room for zero groups */
+		double_colon++;
+		memmove(double_colon + (zero_group_count * 2 - 1), double_colon, strlen(double_colon) + 1);
+
+		/* Write zero groups in the resulting gap, overwriting the second colon */
+		for(int i = 0; i < zero_group_count; i++) {
+			memcpy(&double_colon[i * 2], "0:", 2);
+		}
+
+		/* Remove any leading or trailing colons */
+		if(str[0] == ':') {
+			memmove(&str[0], &str[1], strlen(&str[1]) + 1);
+		}
+
+		if(str[strlen(str) - 1] == ':') {
+			str[strlen(str) - 1] = 0;
+		}
+	}
+
+	if(sscanf(str, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx%n",
+	                &x[0], &x[1], &x[2], &x[3], &x[4], &x[5], &x[6], &x[7], &consumed) >= 8 && !str[consumed]) {
+		if(prefixlength == -1) {
+			prefixlength = 128;
+		}
+
+		if(prefixlength > 128) {
+			return false;
+		}
+
+		subnet->type = SUBNET_IPV6;
+		subnet->net.ipv6.prefixlength = prefixlength;
+		subnet->weight = weight;
+
+		for(int i = 0; i < 8; i++) {
+			subnet->net.ipv6.address.x[i] = htons(x[i]);
+		}
+
+		return true;
+	}
+
+	return false;
 }
 
-char *net2str(subnet_t *subnet)
-{
-  char *netstr;
-cp
-  switch(subnet->type)
-    {
-      case SUBNET_MAC:
-        asprintf(&netstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", subnet->type,
-                   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]);
-      case SUBNET_IPV4:
-        asprintf(&netstr, "%d,%lx/%lx", subnet->type, subnet->net.ipv4.address, subnet->net.ipv4.mask);
-      case SUBNET_IPV6:
-        asprintf(&netstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx",
-                   subnet->net.ipv6.address.x[0],
-                   subnet->net.ipv6.address.x[1],
-                   subnet->net.ipv6.address.x[2],
-                   subnet->net.ipv6.address.x[3],
-                   subnet->net.ipv6.address.x[4],
-                   subnet->net.ipv6.address.x[5],
-                   subnet->net.ipv6.address.x[6],
-                   subnet->net.ipv6.address.x[7],
-                   subnet->net.ipv6.mask.x[0],
-                   subnet->net.ipv6.mask.x[1],
-                   subnet->net.ipv6.mask.x[2],
-                   subnet->net.ipv6.mask.x[3],
-                   subnet->net.ipv6.mask.x[4],
-                   subnet->net.ipv6.mask.x[5],
-                   subnet->net.ipv6.mask.x[6],
-                   subnet->net.ipv6.mask.x[7]);
-      default:
-        netstr = NULL;
-    }
-cp
-  return netstr;
+bool net2str(char *netstr, int len, const subnet_t *subnet) {
+	if(!netstr || !subnet) {
+		logger(LOG_ERR, "net2str() was called with netstr=%p, subnet=%p!", (void *)netstr, (void *)subnet);
+		return false;
+	}
+
+	switch(subnet->type) {
+	case SUBNET_MAC:
+		snprintf(netstr, len, "%x:%x:%x:%x:%x:%x#%d",
+		         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],
+		         subnet->weight);
+		break;
+
+	case SUBNET_IPV4:
+		snprintf(netstr, len, "%u.%u.%u.%u/%d#%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,
+		         subnet->weight);
+		break;
+
+	case SUBNET_IPV6:
+		snprintf(netstr, len, "%x:%x:%x:%x:%x:%x:%x:%x/%d#%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,
+		         subnet->weight);
+		break;
+
+	default:
+		logger(LOG_ERR,
+		       "net2str() was called with unknown subnet type %d, exiting!",
+		       subnet->type);
+		exit(0);
+	}
+
+	return true;
 }
 
 /* Subnet lookup routines */
 
-subnet_t *lookup_subnet_mac(mac_t address)
-{
-  subnet_t *subnet;
-cp
-  for(subnet = subnet_list[SUBNET_MAC]; subnet != NULL; subnet = subnet->next)
-    {
-      if(memcmp(&address, &subnet->net.mac.address, sizeof(address)) == 0)
-        break;
-    }
-cp
-  return subnet;
+subnet_t *lookup_subnet(const node_t *owner, const subnet_t *subnet) {
+	return avl_search(owner->subnet_tree, subnet);
 }
 
-subnet_t *lookup_subnet_ipv4(ipv4_t address)
-{
-  subnet_t *subnet;
-cp
-  for(subnet = subnet_list[SUBNET_IPV4]; subnet != NULL; subnet = subnet->next)
-    {
-      if((address & subnet->net.ipv4.mask) == subnet->net.ipv4.address)
-        break;
-    }
-cp
-  return subnet;
+subnet_t *lookup_subnet_mac(const node_t *owner, const mac_t *address) {
+	subnet_t *p, *r = NULL;
+	avl_node_t *n;
+	int i;
+
+	// Check if this address is cached
+
+	for(i = 0; i < 2; i++) {
+		if(!cache_mac_valid[i]) {
+			continue;
+		}
+
+		if(owner && cache_mac_subnet[i] && cache_mac_subnet[i]->owner != owner) {
+			continue;
+		}
+
+		if(!memcmp(address, &cache_mac_address[i], sizeof(*address))) {
+			return cache_mac_subnet[i];
+		}
+	}
+
+	// Search all subnets for a matching one
+
+	for(n = owner ? owner->subnet_tree->head : subnet_tree->head; n; n = n->next) {
+		p = n->data;
+
+		if(!p || p->type != SUBNET_MAC) {
+			continue;
+		}
+
+		if(!memcmp(address, &p->net.mac.address, sizeof(*address))) {
+			r = p;
+
+			if(p->owner->status.reachable) {
+				break;
+			}
+		}
+	}
+
+	// Cache the result
+
+	cache_mac_slot = !cache_mac_slot;
+	memcpy(&cache_mac_address[cache_mac_slot], address, sizeof(*address));
+	cache_mac_subnet[cache_mac_slot] = r;
+	cache_mac_valid[cache_mac_slot] = true;
+
+	return r;
+}
+
+subnet_t *lookup_subnet_ipv4(const ipv4_t *address) {
+	subnet_t *p, *r = NULL;
+	avl_node_t *n;
+	int i;
+
+	// Check if this address is cached
+
+	for(i = 0; i < 2; i++) {
+		if(!cache_ipv4_valid[i]) {
+			continue;
+		}
+
+		if(!memcmp(address, &cache_ipv4_address[i], sizeof(*address))) {
+			return cache_ipv4_subnet[i];
+		}
+	}
+
+	// Search all subnets for a matching one
+
+	for(n = subnet_tree->head; n; n = n->next) {
+		p = n->data;
+
+		if(!p || p->type != SUBNET_IPV4) {
+			continue;
+		}
+
+		if(!maskcmp(address, &p->net.ipv4.address, p->net.ipv4.prefixlength)) {
+			r = p;
+
+			if(p->owner->status.reachable) {
+				break;
+			}
+		}
+	}
+
+	// Cache the result
+
+	cache_ipv4_slot = !cache_ipv4_slot;
+	memcpy(&cache_ipv4_address[cache_ipv4_slot], address, sizeof(*address));
+	cache_ipv4_subnet[cache_ipv4_slot] = r;
+	cache_ipv4_valid[cache_ipv4_slot] = true;
+
+	return r;
 }
 
-subnet_t *lookup_subnet_ipv6(ipv6_t address)
-{
-  subnet_t *subnet;
-  int i;
-cp
-  for(subnet = subnet_list[SUBNET_IPV6]; subnet != NULL; subnet = subnet->next)
-    {
-      for(i=0; i<8; i++)
-        if((address.x[i] & subnet->net.ipv6.mask.x[i]) != subnet->net.ipv6.address.x[i])
-          break;
-      if(i=8)
-        break;
-    }
-cp
-  return subnet;
+subnet_t *lookup_subnet_ipv6(const ipv6_t *address) {
+	subnet_t *p, *r = NULL;
+	avl_node_t *n;
+	int i;
+
+	// Check if this address is cached
+
+	for(i = 0; i < 2; i++) {
+		if(!cache_ipv6_valid[i]) {
+			continue;
+		}
+
+		if(!memcmp(address, &cache_ipv6_address[i], sizeof(*address))) {
+			return cache_ipv6_subnet[i];
+		}
+	}
+
+	// Search all subnets for a matching one
+
+	for(n = subnet_tree->head; n; n = n->next) {
+		p = n->data;
+
+		if(!p || p->type != SUBNET_IPV6) {
+			continue;
+		}
+
+		if(!maskcmp(address, &p->net.ipv6.address, p->net.ipv6.prefixlength)) {
+			r = p;
+
+			if(p->owner->status.reachable) {
+				break;
+			}
+		}
+	}
+
+	// Cache the result
+
+	cache_ipv6_slot = !cache_ipv6_slot;
+	memcpy(&cache_ipv6_address[cache_ipv6_slot], address, sizeof(*address));
+	cache_ipv6_subnet[cache_ipv6_slot] = r;
+	cache_ipv6_valid[cache_ipv6_slot] = true;
+
+	return r;
+}
+
+void subnet_update(node_t *owner, subnet_t *subnet, bool up) {
+	avl_node_t *node;
+	int i;
+	char *envp[10] = {NULL};
+	char netstr[MAXNETSTR];
+	char *name, *address, *port;
+	char empty[] = "";
+
+	// Prepare environment variables to be passed to the script
+
+	xasprintf(&envp[0], "NETNAME=%s", netname ? netname : "");
+	xasprintf(&envp[1], "DEVICE=%s", device ? device : "");
+	xasprintf(&envp[2], "INTERFACE=%s", iface ? iface : "");
+	xasprintf(&envp[3], "NODE=%s", owner->name);
+	xasprintf(&envp[4], "NAME=%s", myself->name);
+
+	if(owner != myself) {
+		sockaddr2str(&owner->address, &address, &port);
+		// 5 and 6 are reserved for SUBNET and WEIGHT
+		xasprintf(&envp[7], "REMOTEADDRESS=%s", address);
+		xasprintf(&envp[8], "REMOTEPORT=%s", port);
+		free(port);
+		free(address);
+	}
+
+	name = up ? "subnet-up" : "subnet-down";
+
+	if(!subnet) {
+		for(node = owner->subnet_tree->head; node; node = node->next) {
+			subnet = node->data;
+
+			if(!net2str(netstr, sizeof(netstr), subnet)) {
+				continue;
+			}
+
+			// 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;
+			}
+
+			// Prepare the SUBNET and WEIGHT variables
+			free(envp[5]);
+			free(envp[6]);
+
+			xasprintf(&envp[5], "SUBNET=%s", netstr);
+			xasprintf(&envp[6], "WEIGHT=%s", weight);
+
+			execute_script(name, envp);
+		}
+	} 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;
+			}
+
+			// Prepare the SUBNET and WEIGHT variables
+			xasprintf(&envp[5], "SUBNET=%s", netstr);
+			xasprintf(&envp[6], "WEIGHT=%s", weight);
+
+			execute_script(name, envp);
+		}
+	}
+
+	for(i = 0; i < 9; i++) {
+		free(envp[i]);
+	}
+}
+
+void dump_subnets(void) {
+	char netstr[MAXNETSTR];
+	subnet_t *subnet;
+	avl_node_t *node;
+
+	logger(LOG_DEBUG, "Subnet list:");
+
+	for(node = subnet_tree->head; node; node = node->next) {
+		subnet = node->data;
+
+		if(!net2str(netstr, sizeof(netstr), subnet)) {
+			continue;
+		}
+
+		logger(LOG_DEBUG, " %s owner %s", netstr, subnet->owner->name);
+	}
+
+	logger(LOG_DEBUG, "End of subnet list.");
 }