X-Git-Url: https://www.tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fsubnet.c;h=94000cc0eb8b9fcb23012162850e6b00a29e15dc;hb=4436af55e55e79b496264fe114039fbc1198d71f;hp=984cc7f8ece644ff2f2ec80cd6054366efe3fba1;hpb=c46f56a8b8bb865dd8951441b5acf4701b5b5b09;p=tinc diff --git a/src/subnet.c b/src/subnet.c index 984cc7f8..94000cc0 100644 --- a/src/subnet.c +++ b/src/subnet.c @@ -1,7 +1,7 @@ /* subnet.c -- handle subnet lookups and lists - Copyright (C) 2000-2004 Guus Sliepen , - 2000-2004 Ivo Timmermans + Copyright (C) 2000-2022 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 @@ -13,442 +13,397 @@ 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. - - $Id$ + 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 "splay_tree.h" +#include "control_common.h" +#include "crypto.h" +#include "hash.h" #include "logger.h" #include "net.h" #include "netutl.h" #include "node.h" -#include "process.h" +#include "script.h" #include "subnet.h" -#include "utils.h" #include "xalloc.h" +#include "sandbox.h" /* lists type of subnet */ +uint32_t hash_seed; +splay_tree_t subnet_tree = { + .compare = (splay_compare_t) subnet_compare, + .delete = (splay_action_t) free_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)); +/* Subnet lookup cache */ - if(result || !a->owner || !b->owner) - return result; - - return strcmp(a->owner->name, b->owner->name); +static uint32_t wrapping_add32(uint32_t a, uint32_t b) { + return (uint32_t)((uint64_t)a + b); } -static int subnet_compare_ipv4(const subnet_t *a, const subnet_t *b) -{ - int result; +static uint32_t wrapping_mul32(uint32_t a, uint32_t b) { + return (uint32_t)((uint64_t)a * b); +} - result = memcmp(&a->net.ipv4.address, &b->net.ipv4.address, sizeof(ipv4_t)); +static uint32_t hash_function_ipv4_t(const ipv4_t *p) { + /* + This basic hash works because + a) Most IPv4 networks routed via tinc are not /0 + b) Most IPv4 networks have more unique low order bits + */ + uint16_t *halfwidth = (uint16_t *)p; + uint32_t hash = hash_seed; + +#if __BYTE_ORDER == __LITTLE_ENDIAN + // 10.0.x.x/16 part + hash = wrapping_add32(hash, wrapping_mul32(halfwidth[1], 0x9e370001U)); + + // x.x.0.[0-255] part +#if SUBNET_HASH_SIZE >= 0x10000 + return hash ^ halfwidth[0]; +#else + // ensure that we have a /24 with no collisions on 32bit + return hash ^ ntohs(halfwidth[0]); +#endif // _____LP64_____ +#else + // 10.0.x.x/16 part + hash = wrapping_add32(hash, wrapping_mul32(halfwidth[0], 0x9e370001U)); + + // x.x.0.[0-255] part (ntohs is nop on big endian) + return hash ^ halfwidth[1]; +#endif // __BYTE_ORDER == __LITTLE_ENDIAN +} - if(result) - return result; - result = a->net.ipv4.prefixlength - b->net.ipv4.prefixlength; +static uint32_t hash_function_ipv6_t(const ipv6_t *p) { + uint32_t *fullwidth = (uint32_t *)p; + uint32_t hash = hash_seed; - if(result || !a->owner || !b->owner) - return result; + for(int i = 0; i < 4; i++) { + hash = wrapping_add32(hash, fullwidth[i]); + hash = wrapping_mul32(hash, 0x9e370001U); + } - return strcmp(a->owner->name, b->owner->name); + return hash; } -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)); +static uint32_t hash_function_mac_t(const mac_t *p) { + uint16_t *halfwidth = (uint16_t *)p; + uint32_t hash = hash_seed; - if(result) - return result; + for(int i = 0; i < 3; i++) { + hash = wrapping_add32(hash, halfwidth[i]); + hash = wrapping_mul32(hash, 0x9e370001U); + } - result = a->net.ipv6.prefixlength - b->net.ipv6.prefixlength; + return hash; +} - if(result || !a->owner || !b->owner) - return result; +hash_define(ipv4_t, SUBNET_HASH_SIZE) +hash_define(ipv6_t, SUBNET_HASH_SIZE) +hash_define(mac_t, SUBNET_HASH_SIZE) - return strcmp(a->owner->name, b->owner->name); -} +hash_new(ipv4_t, ipv4_cache); +hash_new(ipv6_t, ipv6_cache); +hash_new(mac_t, mac_cache); -int subnet_compare(const subnet_t *a, const subnet_t *b) -{ - int result; - result = a->type - b->type; +void subnet_cache_flush_table(subnet_type_t stype) { + // NOTE: a subnet type of SUBNET_TYPES can be used to clear all hash tables - if(result) - return result; + if(stype != SUBNET_IPV6) { // ipv4 + hash_clear(ipv4_t, &ipv4_cache); + } - 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); + if(stype != SUBNET_IPV4) { // ipv6 + hash_clear(ipv6_t, &ipv6_cache); } - return 0; + hash_clear(mac_t, &mac_cache); } /* Initialising trees */ -void init_subnets(void) -{ - cp(); +void init_subnets(void) { + hash_seed = prng(UINT32_MAX); - subnet_tree = avl_alloc_tree((avl_compare_t) subnet_compare, (avl_action_t) free_subnet); + // tables need to be cleared on startup + subnet_cache_flush_tables(); } -void exit_subnets(void) -{ - cp(); +void exit_subnets(void) { + splay_empty_tree(&subnet_tree); + subnet_cache_flush_tables(); +} - avl_delete_tree(subnet_tree); +void init_subnet_tree(splay_tree_t *tree) { + memset(tree, 0, sizeof(*tree)); + tree->compare = (splay_compare_t) subnet_compare; } -avl_tree_t *new_subnet_tree(void) -{ - cp(); +/* Allocating and freeing space for subnets */ - return avl_alloc_tree((avl_compare_t) subnet_compare, NULL); +subnet_t *new_subnet(void) { + return xzalloc(sizeof(subnet_t)); } -void free_subnet_tree(avl_tree_t *subnet_tree) -{ - cp(); +void free_subnet(subnet_t *subnet) { + free(subnet); +} - avl_delete_tree(subnet_tree); +void subnet_cache_flush_tables(void) { + // flushes all the tables + hash_clear(ipv4_t, &ipv4_cache); + hash_clear(ipv6_t, &ipv6_cache); + hash_clear(mac_t, &mac_cache); } -/* Allocating and freeing space for subnets */ +static void subnet_cache_flush(subnet_t *subnet) { + switch(subnet->type) { + case SUBNET_IPV4: + if(subnet->net.ipv4.prefixlength == 32) { + hash_delete(ipv4_t, &ipv4_cache, &subnet->net.ipv4.address); + return; + } -subnet_t *new_subnet(void) -{ - cp(); + break; - return xmalloc_and_zero(sizeof(subnet_t)); -} + case SUBNET_IPV6: + if(subnet->net.ipv4.prefixlength == 128) { + hash_delete(ipv6_t, &ipv6_cache, &subnet->net.ipv6.address); + return; + } -void free_subnet(subnet_t *subnet) -{ - cp(); + break; - free(subnet); + case SUBNET_MAC: + hash_delete(mac_t, &mac_cache, &subnet->net.mac.address); + return; + } + + subnet_cache_flush_table(subnet->type); } /* 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(subnet); } -/* Ascii representation of subnets */ - -bool str2net(subnet_t *subnet, const char *subnetstr) -{ - int i, l; - uint16_t x[8]; +void subnet_del(node_t *n, subnet_t *subnet) { + if(n) { + splay_delete(&n->subnet_tree, subnet); + } - cp(); + splay_delete(&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_cache_flush(subnet); +} - for(i = 0; i < 4; i++) - subnet->net.ipv4.address.x[i] = x[i]; +/* Subnet lookup routines */ - return true; - } +subnet_t *lookup_subnet(node_t *owner, const subnet_t *subnet) { + return splay_search(&owner->subnet_tree, subnet); +} - 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; +subnet_t *lookup_subnet_mac(const node_t *owner, const mac_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 true; + if((r = hash_search(mac_t, &mac_cache, address))) { + return r; } - 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; - - for(i = 0; i < 4; i++) - subnet->net.ipv4.address.x[i] = x[i]; + // Search all subnets for a matching one - 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) { - subnet->type = SUBNET_IPV6; - subnet->net.ipv6.prefixlength = 128; + for splay_each(subnet_t, p, owner ? &owner->subnet_tree : &subnet_tree) { + if(!p || p->type != SUBNET_MAC) { + continue; + } - for(i = 0; i < 8; i++) - subnet->net.ipv6.address.x[i] = htons(x[i]); + if(!memcmp(address, &p->net.mac.address, sizeof(*address))) { + r = p; - return true; + if(!p->owner || p->owner->status.reachable) { + break; + } + } } - 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; - - for(i = 0; i < 6; i++) - subnet->net.mac.address.x[i] = x[i]; + // Cache the result - return true; + if(r) { + hash_insert(mac_t, &mac_cache, address, r); } - return false; + return r; } -bool net2str(char *netstr, int len, const subnet_t *subnet) -{ - cp(); - - switch (subnet->type) { - case SUBNET_MAC: - snprintf(netstr, len, "%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: - snprintf(netstr, len, "%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: - snprintf(netstr, len, "%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); - } +subnet_t *lookup_subnet_ipv4(const ipv4_t *address) { + subnet_t *r = NULL; - return true; -} + // Check if this address is cached -/* Subnet lookup routines */ + if((r = hash_search(ipv4_t, &ipv4_cache, address))) { + return r; + } -subnet_t *lookup_subnet(const node_t *owner, const subnet_t *subnet) -{ - cp(); + // Search all subnets for a matching one - return avl_search(owner->subnet_tree, subnet); -} + for splay_each(subnet_t, p, &subnet_tree) { + if(!p || p->type != SUBNET_IPV4) { + continue; + } -subnet_t *lookup_subnet_mac(const mac_t *address) -{ - subnet_t *p, subnet = {0}; + if(!maskcmp(address, &p->net.ipv4.address, p->net.ipv4.prefixlength)) { + r = p; - cp(); + if(!p->owner || p->owner->status.reachable) { + break; + } + } + } - subnet.type = SUBNET_MAC; - subnet.net.mac.address = *address; - subnet.owner = NULL; + // Cache the result - p = avl_search(subnet_tree, &subnet); + if(r) { + hash_insert(ipv4_t, &ipv4_cache, address, r); + } - return p; + return r; } -subnet_t *lookup_subnet_ipv4(const ipv4_t *address) -{ - subnet_t *p, subnet = {0}; +subnet_t *lookup_subnet_ipv6(const ipv6_t *address) { + subnet_t *r = NULL; - cp(); + // Check if this address is cached - subnet.type = SUBNET_IPV4; - subnet.net.ipv4.address = *address; - subnet.net.ipv4.prefixlength = 32; - subnet.owner = NULL; + if((r = hash_search(ipv6_t, &ipv6_cache, address))) { + return r; + } - do { - /* Go find subnet */ + // Search all subnets for a matching one - p = avl_search_closest_smaller(subnet_tree, &subnet); + for splay_each(subnet_t, p, &subnet_tree) { + if(!p || p->type != SUBNET_IPV6) { + continue; + } - /* Check if the found subnet REALLY matches */ + if(!maskcmp(address, &p->net.ipv6.address, p->net.ipv6.prefixlength)) { + r = p; - if(p) { - if(p->type != SUBNET_IPV4) { - p = NULL; + if(!p->owner || 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 - 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(r) { + hash_insert(ipv6_t, &ipv6_cache, address, r); + } - 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) { + if(!sandbox_can(START_PROCESSES, RIGHT_NOW)) { + return; + } + + char netstr[MAXNETSTR]; + char *address, *port; + char empty[] = ""; - cp(); + // Prepare environment variables to be passed to the script - subnet.type = SUBNET_IPV6; - subnet.net.ipv6.address = *address; - subnet.net.ipv6.prefixlength = 128; - subnet.owner = NULL; + environment_t env; + environment_init(&env); + environment_add(&env, "NODE=%s", owner->name); - do { - /* Go find subnet */ + if(owner != myself) { + sockaddr2str(&owner->address, &address, &port); + environment_add(&env, "REMOTEADDRESS=%s", address); + environment_add(&env, "REMOTEPORT=%s", port); + free(port); + free(address); + } - p = avl_search_closest_smaller(subnet_tree, &subnet); + int env_subnet = environment_add(&env, NULL); + int env_weight = environment_add(&env, NULL); - /* Check if the found subnet REALLY matches */ + const char *name = up ? "subnet-up" : "subnet-down"; - if(p) { - if(p->type != SUBNET_IPV6) - return NULL; + if(!subnet) { + for splay_each(subnet_t, subnet, &owner->subnet_tree) { + if(!net2str(netstr, sizeof(netstr), subnet)) { + continue; + } - 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 */ + // Strip the weight from the subnet, and put it in its own environment variable + char *weight = strchr(netstr, '#'); - 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)); + if(weight) { + *weight++ = 0; + } else { + weight = empty; } - } - } while(p); - return p; -} + // Prepare the SUBNET and WEIGHT variables + environment_update(&env, env_subnet, "SUBNET=%s", netstr); + environment_update(&env, env_weight, "WEIGHT=%s", weight); -void subnet_update(node_t *owner, subnet_t *subnet, bool up) { - avl_node_t *node; - int i; - char *envp[8]; - char netstr[MAXNETSTR + 7] = "SUBNET="; - char *name, *address, *port; - - asprintf(&envp[0], "NETNAME=%s", netname ? : ""); - asprintf(&envp[1], "DEVICE=%s", device ? : ""); - asprintf(&envp[2], "INTERFACE=%s", iface ? : ""); - asprintf(&envp[3], "NODE=%s", owner->name); - if(owner != myself) { - sockaddr2str(&owner->address, &address, &port); - asprintf(&envp[4], "REMOTEADDRESS=%s", address); - asprintf(&envp[5], "REMOTEPORT=%s", port); - envp[6] = netstr; - envp[7] = NULL; + execute_script(name, &env); + } } else { - envp[4] = netstr; - envp[5] = NULL; - } + 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; + } - name = up ? "subnet-up" : "subnet-down"; + // Prepare the SUBNET and WEIGHT variables + environment_update(&env, env_subnet, "SUBNET=%s", netstr); + environment_update(&env, env_weight, "WEIGHT=%s", weight); - if(!subnet) { - for(node = owner->subnet_tree->head; node; node = node->next) { - subnet = node->data; - if(!net2str(netstr + 7, sizeof netstr - 7, subnet)) - continue; - execute_script(name, envp); + execute_script(name, &env); } - } else { - if(net2str(netstr + 7, sizeof netstr - 7, subnet)) - execute_script(name, envp); } - net2str(netstr, sizeof netstr, subnet); - envp[6] = envp[7] = NULL; - - for(i = 0; i < (owner != myself ? 6 : 4); i++) - free(envp[i]); - - free(address); - free(port); + environment_exit(&env); } -void dump_subnets(void) -{ - char netstr[MAXNETSTR]; - subnet_t *subnet; - avl_node_t *node; - - cp(); +bool dump_subnets(connection_t *c) { + for splay_each(subnet_t, subnet, &subnet_tree) { + char netstr[MAXNETSTR]; - logger(LOG_DEBUG, _("Subnet list:")); - - for(node = subnet_tree->head; node; node = node->next) { - subnet = node->data; - if(!net2str(netstr, sizeof netstr, subnet)) + if(!net2str(netstr, sizeof(netstr), subnet)) { continue; - logger(LOG_DEBUG, _(" %s owner %s"), netstr, subnet->owner->name); + } + + 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); }