X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fsubnet.c;h=154fd8048b16285ff79c8d8b3665ff72a5f84db4;hp=b0c1e04e0a01da05e5d5dbafac92b8bf01ebace6;hb=HEAD;hpb=013a2e159e42c46808ea8d0b6abd57525db30a50 diff --git a/src/subnet.c b/src/subnet.c index b0c1e04e..da69810c 100644 --- a/src/subnet.c +++ b/src/subnet.c @@ -1,7 +1,7 @@ /* subnet.c -- handle subnet lookups and lists - Copyright (C) 2000-2003 Guus Sliepen , - 2000-2003 Ivo Timmermans + Copyright (C) 2000-2019 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 @@ -13,20 +13,20 @@ 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 1.4 2003/08/24 20:38:28 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 "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" @@ -35,74 +35,119 @@ 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) -{ +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) + 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) -{ +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) + if(result) { return result; + } - result = a->net.ipv4.prefixlength - b->net.ipv4.prefixlength; + result = a->weight - b->weight; - if(result || !a->owner || !b->owner) + 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) -{ +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) + if(result) { return result; + } - result = a->net.ipv6.prefixlength - b->net.ipv6.prefixlength; + result = a->weight - b->weight; - if(result || !a->owner || !b->owner) + 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 subnet_compare(const subnet_t *a, const subnet_t *b) { int result; result = a->type - b->type; - if(result) + if(result) { return result; + } - switch (a->type) { + 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(); + logger(LOG_ERR, "subnet_compare() was called with unknown subnet type %d, exitting!", + a->type); exit(0); } @@ -111,303 +156,456 @@ static int subnet_compare(const subnet_t *a, const subnet_t *b) /* Initialising trees */ -void init_subnets(void) -{ - cp(); - +void init_subnets(void) { subnet_tree = avl_alloc_tree((avl_compare_t) subnet_compare, (avl_action_t) free_subnet); -} -void exit_subnets(void) -{ - cp(); + subnet_cache_flush(); +} +void exit_subnets(void) { avl_delete_tree(subnet_tree); } -avl_tree_t *new_subnet_tree(void) -{ - cp(); - +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) -{ - cp(); - +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_and_zero(sizeof(subnet_t)); +subnet_t *new_subnet(void) { + return xmalloc_and_zero(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); -} -void subnet_del(node_t *n, subnet_t *subnet) -{ - cp(); + 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(const char *subnetstr) -{ - int i, l; - subnet_t *subnet; - uint16_t x[8]; +bool str2net(subnet_t *subnet, const char *subnetstr) { + char str[64]; + strncpy(str, subnetstr, sizeof(str)); + str[sizeof(str) - 1] = 0; + int consumed; - cp(); + int weight = 10; + char *weight_separator = strchr(str, '#'); - subnet = new_subnet(); + if(weight_separator) { + char *weight_str = weight_separator + 1; - 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; + if(sscanf(weight_str, "%d%n", &weight, &consumed) < 1) { + return false; + } - for(i = 0; i < 4; i++) - subnet->net.ipv4.address.x[i] = x[i]; + if(weight_str[consumed]) { + return false; + } - return subnet; + *weight_separator = 0; } - 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; + int prefixlength = -1; + char *prefixlength_separator = strchr(str, '/'); - for(i = 0; i < 8; i++) - subnet->net.ipv6.address.x[i] = htons(x[i]); + if(prefixlength_separator) { + char *prefixlength_str = prefixlength_separator + 1; - return subnet; + 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; + } } - 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; + 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(i = 0; i < 4; i++) - subnet->net.ipv4.address.x[i] = x[i]; + for(int i = 0; i < 6; i++) { + subnet->net.mac.address.x[i] = x[i]; + } + + return true; + } + + if(inet_pton(AF_INET, str, &subnet->net.ipv4.address)) { + if(prefixlength == -1) { + prefixlength = 32; + } + + if(prefixlength > 32) { + return false; + } + + subnet->type = SUBNET_IPV4; + subnet->net.ipv4.prefixlength = prefixlength; + subnet->weight = weight; - return subnet; + return true; } - 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) { + if(inet_pton(AF_INET6, str, &subnet->net.ipv6.address)) { + if(prefixlength == -1) { + prefixlength = 128; + } + + if(prefixlength > 128) { + return false; + } + subnet->type = SUBNET_IPV6; - subnet->net.ipv6.prefixlength = 128; + subnet->net.ipv6.prefixlength = prefixlength; + subnet->weight = weight; - for(i = 0; i < 8; i++) - subnet->net.ipv6.address.x[i] = htons(x[i]); + return true; + } - return subnet; + return false; +} + +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; } - 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; + int result; + int prefixlength = -1; - for(i = 0; i < 6; i++) - subnet->net.mac.address.x[i] = x[i]; + switch(subnet->type) { + case SUBNET_MAC: + snprintf(netstr, len, "%02x:%02x:%02x:%02x:%02x:%02x", + 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: + inet_ntop(AF_INET, &subnet->net.ipv4.address, netstr, len); + prefixlength = subnet->net.ipv4.prefixlength; + + if(prefixlength == 32) { + prefixlength = -1; + } + + break; + + case SUBNET_IPV6: { + inet_ntop(AF_INET6, &subnet->net.ipv6.address, netstr, len); + prefixlength = subnet->net.ipv6.prefixlength; + + if(prefixlength == 128) { + prefixlength = -1; + } - return subnet; + break; } - free(subnet); + default: + logger(LOG_ERR, "net2str() was called with unknown subnet type %d, exiting!", subnet->type); + exit(1); + } - return NULL; -} + size_t used = strlen(netstr); + netstr += used; + len -= used; -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(prefixlength >= 0) { + result = snprintf(netstr, len, "/%d", prefixlength); + netstr += result; + len -= result; } - return netstr; + if(subnet->weight != 10) { + snprintf(netstr, len, "#%d", subnet->weight); + } + + return true; } /* Subnet lookup routines */ -subnet_t *lookup_subnet(const node_t *owner, const subnet_t *subnet) -{ - cp(); - +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 mac_t *address) -{ - subnet_t *p, subnet = {0}; +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 - cp(); + for(n = owner ? owner->subnet_tree->head : subnet_tree->head; n; n = n->next) { + p = n->data; - subnet.type = SUBNET_MAC; - subnet.net.mac.address = *address; - subnet.owner = NULL; + if(!p || p->type != SUBNET_MAC) { + continue; + } - p = (subnet_t *) avl_search(subnet_tree, &subnet); + if(!memcmp(address, &p->net.mac.address, sizeof(*address))) { + r = p; - return 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, subnet = {0}; +subnet_t *lookup_subnet_ipv4(const ipv4_t *address) { + subnet_t *p, *r = NULL; + avl_node_t *n; + int i; - cp(); + // 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]; + } + } - subnet.type = SUBNET_IPV4; - subnet.net.ipv4.address = *address; - subnet.net.ipv4.prefixlength = 32; - subnet.owner = NULL; + // Search all subnets for a matching one - do { - /* Go find subnet */ + for(n = subnet_tree->head; n; n = n->next) { + p = n->data; - p = (subnet_t *) avl_search_closest_smaller(subnet_tree, &subnet); + if(!p || p->type != SUBNET_IPV4) { + continue; + } - /* Check if the found subnet REALLY matches */ + if(!maskcmp(address, &p->net.ipv4.address, p->net.ipv4.prefixlength)) { + r = p; - if(p) { - if(p->type != SUBNET_IPV4) { - p = NULL; + if(p->owner->status.reachable) { break; } + } + } - 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 */ + // 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; + } - 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)); + if(!maskcmp(address, &p->net.ipv6.address, p->net.ipv6.prefixlength)) { + r = p; + + if(p->owner->status.reachable) { + break; } } - } while(p); + } + + // 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 p; + return r; } -subnet_t *lookup_subnet_ipv6(const ipv6_t *address) -{ - subnet_t *p, subnet = {0}; +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); + } - cp(); + name = up ? "subnet-up" : "subnet-down"; - subnet.type = SUBNET_IPV6; - subnet.net.ipv6.address = *address; - subnet.net.ipv6.prefixlength = 128; - subnet.owner = NULL; + if(!subnet) { + for(node = owner->subnet_tree->head; node; node = node->next) { + subnet = node->data; - do { - /* Go find subnet */ + if(!net2str(netstr, sizeof(netstr), subnet)) { + continue; + } - p = (subnet_t *) avl_search_closest_smaller(subnet_tree, &subnet); + // Strip the weight from the subnet, and put it in its own environment variable + char *weight = strchr(netstr, '#'); - /* Check if the found subnet REALLY matches */ + if(weight) { + *weight++ = 0; + } else { + weight = empty; + } - if(p) { - if(p->type != SUBNET_IPV6) - return NULL; + // Prepare the SUBNET and WEIGHT variables + free(envp[5]); + free(envp[6]); - 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 */ + xasprintf(&envp[5], "SUBNET=%s", netstr); + xasprintf(&envp[6], "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, 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); } - } while(p); + } - return p; + for(i = 0; i < 9; i++) { + free(envp[i]); + } } -void dump_subnets(void) -{ - char *netstr; +void dump_subnets(void) { + char netstr[MAXNETSTR]; subnet_t *subnet; avl_node_t *node; - cp(); - - logger(LOG_DEBUG, _("Subnet list:")); + logger(LOG_DEBUG, "Subnet list:"); 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); + 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.")); + logger(LOG_DEBUG, "End of subnet list."); }