+subnet_t *lookup_subnet(const node_t *owner, const subnet_t *subnet) {
+ return splay_search(owner->subnet_tree, subnet);
+}
+
+subnet_t *lookup_subnet_mac(const mac_t *address) {
+ subnet_t *p, *r = NULL, subnet = {0};
+ splay_node_t *n;
+ int i;
+
+ // Check if this address is cached
+
+ for(i = 0; i < 2; i++) {
+ if(!cache_mac_valid[i])
+ continue;
+ if(!memcmp(address, &cache_mac_address[i], sizeof *address))
+ return cache_mac_subnet[i];
+ }
+
+ // Search all subnets for a matching one
+
+ subnet.type = SUBNET_MAC;
+ subnet.net.mac.address = *address;
+ subnet.owner = NULL;
+
+ for(n = subnet_tree->head; n; n = n->next) {
+ p = n->data;
+
+ if(!p || p->type != subnet.type)
+ 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, subnet = {0};
+ splay_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
+
+ subnet.type = SUBNET_IPV4;
+ subnet.net.ipv4.address = *address;
+ subnet.net.ipv4.prefixlength = 32;
+ subnet.owner = NULL;
+
+ for(n = subnet_tree->head; n; n = n->next) {
+ p = n->data;
+
+ if(!p || p->type != subnet.type)
+ 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(const ipv6_t *address) {
+ subnet_t *p, *r = NULL, subnet = {0};
+ splay_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
+
+ subnet.type = SUBNET_IPV6;
+ subnet.net.ipv6.address = *address;
+ subnet.net.ipv6.prefixlength = 128;
+ subnet.owner = NULL;
+
+ for(n = subnet_tree->head; n; n = n->next) {
+ p = n->data;
+
+ if(!p || p->type != subnet.type)
+ 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;