X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fsubnet.c;h=81dae5f3a6b6a0f257e3011036d01015915320ed;hp=9c225f2129bfbd0df31d571d6712d48830ecb3f1;hb=99763e34d52fcfe76b0bb9c7f3a17ace51cfdbfc;hpb=2228b16159a7aff64e6559ee1635716154e67fe6 diff --git a/src/subnet.c b/src/subnet.c index 9c225f21..81dae5f3 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 , - 2000 Ivo Timmermans + Copyright (C) 2000-2014 Guus Sliepen , + 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 @@ -13,74 +13,673 @@ 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 1.1.2.1 2000/10/01 03:21:49 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 "subnet.h" +#include "system.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 */ + +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 -cp -} - -void free_subnet(subnet_t *subnet) -{ -cp -cp -} - -/* Linked list management */ - -int subnet_add(conn_list_t *cl, subnet_t *subnet) -{ -cp - subnet->next = cl->subnets->next; - subnet->prev = NULL; - subnet->next->prev = subnet - cl->subnets = subnet; -cp - return 0; -} - -int subnet_del(conn_list_t *cl, subnet_t *subnet) -{ -cp - if(subnet->prev) - { - subnet->prev->next = subnet->next; - } - else - { - subnet->owner->subnets = subnet->next; - } - - subnet->next->prev = subnet->prev; - free_subnet(subnet); -cp - return 0; +subnet_t *new_subnet(void) { + return xmalloc_and_zero(sizeof(subnet_t)); +} + +void free_subnet(subnet_t *subnet) { + free(subnet); +} + +/* 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(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) -{ -cp -cp +bool str2net(subnet_t *subnet, const char *subnetstr) { + int i, l; + uint16_t x[8]; + int weight = 10; + + if(sscanf(subnetstr, "%hu.%hu.%hu.%hu/%d#%d", + &x[0], &x[1], &x[2], &x[3], &l, &weight) >= 5) { + if(l < 0 || l > 32) { + return false; + } + + subnet->type = SUBNET_IPV4; + subnet->net.ipv4.prefixlength = l; + subnet->weight = weight; + + for(i = 0; i < 4; i++) { + if(x[i] > 255) { + return false; + } + + subnet->net.ipv4.address.x[i] = x[i]; + } + + return true; + } + + if(sscanf(subnetstr, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%d#%d", + &x[0], &x[1], &x[2], &x[3], &x[4], &x[5], &x[6], &x[7], + &l, &weight) >= 9) { + if(l < 0 || l > 128) { + return false; + } + + subnet->type = SUBNET_IPV6; + subnet->net.ipv6.prefixlength = l; + subnet->weight = weight; + + for(i = 0; i < 8; i++) { + subnet->net.ipv6.address.x[i] = htons(x[i]); + } + + return true; + } + + if(sscanf(subnetstr, "%hu.%hu.%hu.%hu#%d", &x[0], &x[1], &x[2], &x[3], &weight) >= 4) { + subnet->type = SUBNET_IPV4; + subnet->net.ipv4.prefixlength = 32; + subnet->weight = weight; + + for(i = 0; i < 4; i++) { + if(x[i] > 255) { + return false; + } + + subnet->net.ipv4.address.x[i] = x[i]; + } + + return true; + } + + 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], &weight) >= 8) { + subnet->type = SUBNET_IPV6; + subnet->net.ipv6.prefixlength = 128; + subnet->weight = weight; + + for(i = 0; i < 8; i++) { + subnet->net.ipv6.address.x[i] = htons(x[i]); + } + + return true; + } + + if(sscanf(subnetstr, "%hx:%hx:%hx:%hx:%hx:%hx#%d", + &x[0], &x[1], &x[2], &x[3], &x[4], &x[5], &weight) >= 6) { + subnet->type = SUBNET_MAC; + subnet->weight = weight; + + for(i = 0; i < 6; i++) { + subnet->net.mac.address.x[i] = x[i]; + } + + return true; + } + + // IPv6 short form + if(strstr(subnetstr, "::")) { + const char *p; + char *q; + int colons = 0; + + // Count number of colons + for(p = subnetstr; *p; p++) + if(*p == ':') { + colons++; + } + + if(colons > 7) { + return false; + } + + // Scan numbers before the double colon + p = subnetstr; + + for(i = 0; i < colons; i++) { + if(*p == ':') { + break; + } + + x[i] = strtoul(p, &q, 0x10); + + if(!q || p == q || *q != ':') { + return false; + } + + p = ++q; + } + + p++; + colons -= i; + + if(!i) { + p++; + colons--; + } + + if(!*p || *p == '/' || *p == '#') { + colons--; + } + + // Fill in the blanks + for(; i < 8 - colons; i++) { + x[i] = 0; + } + + // Scan the remaining numbers + for(; i < 8; i++) { + x[i] = strtoul(p, &q, 0x10); + + if(!q || p == q) { + return false; + } + + if(i == 7) { + p = q; + break; + } + + if(*q != ':') { + return false; + } + + p = ++q; + } + + l = 128; + + if(*p == '/') { + sscanf(p, "/%d#%d", &l, &weight); + } else if(*p == '#') { + sscanf(p, "#%d", &weight); + } + + if(l < 0 || l > 128) { + return false; + } + + subnet->type = SUBNET_IPV6; + subnet->net.ipv6.prefixlength = l; + subnet->weight = weight; + + for(i = 0; i < 8; i++) { + subnet->net.ipv6.address.x[i] = htons(x[i]); + } + + return true; + } + + return false; } -char *net2str(subnet_t *subnet) -{ -cp -cp +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(const node_t *owner, const subnet_t *subnet) { + return avl_search(owner->subnet_tree, 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(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 + if(envp[5]) { + free(envp[5]); + } + + if(envp[6]) { + 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; envp[i] && 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."); +}