X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fsubnet.c;h=090a62bfe74236e4d7289e366d0a063f25f3630e;hp=5f649b51ab906186f9dc52bfa66ad85702920adb;hb=c2dc3784f127ef6db6e9960a4abecc1aab6f4e31;hpb=462ab530e546f5732dfd51134751da6f6910d679 diff --git a/src/subnet.c b/src/subnet.c index 5f649b51..090a62bf 100644 --- a/src/subnet.c +++ b/src/subnet.c @@ -1,7 +1,7 @@ /* subnet.c -- handle subnet lookups and lists - Copyright (C) 2000-2002 Guus Sliepen , - 2000-2002 Ivo Timmermans + Copyright (C) 2000-2013 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 @@ -13,382 +13,270 @@ 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 1.2 2002/04/09 15:26:01 zarq 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 -#include -#include -#include -#include -#include -#include - -#include -#include -#include +#include "system.h" -#include "conf.h" +#include "splay_tree.h" +#include "control_common.h" +#include "device.h" +#include "hash.h" +#include "logger.h" +#include "names.h" #include "net.h" +#include "netutl.h" #include "node.h" +#include "script.h" #include "subnet.h" -#include "netutl.h" - -#include "system.h" +#include "utils.h" +#include "xalloc.h" /* lists type of subnet */ -avl_tree_t *subnet_tree; - -/* Subnet comparison */ +splay_tree_t *subnet_tree; -int subnet_compare_mac(subnet_t *a, subnet_t *b) -{ -cp - return memcmp(&a->net.mac.address, &b->net.mac.address, sizeof(mac_t)); -} +/* Subnet lookup cache */ -int subnet_compare_ipv4(subnet_t *a, subnet_t *b) -{ - int result; -cp - result = memcmp(&a->net.ipv4.address, &b->net.ipv4.address, sizeof(ipv4_t)); - - if(result) - return result; +static hash_t *ipv4_cache; +static hash_t *ipv6_cache; +static hash_t *mac_cache; - return a->net.ipv4.prefixlength - b->net.ipv4.prefixlength; +void subnet_cache_flush(void) { + hash_clear(ipv4_cache); + hash_clear(ipv6_cache); + hash_clear(mac_cache); } -int subnet_compare_ipv6(subnet_t *a, subnet_t *b) -{ - int result; -cp - result = memcmp(&a->net.ipv6.address, &b->net.ipv6.address, sizeof(ipv6_t)); - - if(result) - return result; +/* Initialising trees */ - return a->net.ipv6.prefixlength - b->net.ipv6.prefixlength; -} +void init_subnets(void) { + subnet_tree = splay_alloc_tree((splay_compare_t) subnet_compare, (splay_action_t) free_subnet); -int subnet_compare(subnet_t *a, subnet_t *b) -{ - int result; -cp - 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: - syslog(LOG_ERR, _("subnet_compare() was called with unknown subnet type %d, exitting!"), a->type); - cp_trace(); - exit(0); - } - - return 0; + ipv4_cache = hash_alloc(0x100, sizeof(ipv4_t)); + ipv6_cache = hash_alloc(0x100, sizeof(ipv6_t)); + mac_cache = hash_alloc(0x100, sizeof(mac_t)); } -/* Initialising trees */ - -void init_subnets(void) -{ -cp - subnet_tree = avl_alloc_tree((avl_compare_t)subnet_compare, (avl_action_t)free_subnet); -cp -} +void exit_subnets(void) { + splay_delete_tree(subnet_tree); -void exit_subnets(void) -{ -cp - avl_delete_tree(subnet_tree); -cp + hash_free(ipv4_cache); + hash_free(ipv6_cache); + hash_free(mac_cache); } -avl_tree_t *new_subnet_tree(void) -{ -cp - return avl_alloc_tree((avl_compare_t)subnet_compare, NULL); -cp +splay_tree_t *new_subnet_tree(void) { + return splay_alloc_tree((splay_compare_t) subnet_compare, NULL); } -void free_subnet_tree(avl_tree_t *subnet_tree) -{ -cp - avl_delete_tree(subnet_tree); -cp +void free_subnet_tree(splay_tree_t *subnet_tree) { + splay_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 xzalloc(sizeof(subnet_t)); } -void free_subnet(subnet_t *subnet) -{ -cp - free(subnet); +void free_subnet(subnet_t *subnet) { + free(subnet); } /* Adding and removing subnets */ -void subnet_add(node_t *n, subnet_t *subnet) -{ -cp - subnet->owner = n; +void subnet_add(node_t *n, subnet_t *subnet) { + subnet->owner = n; - avl_insert(subnet_tree, subnet); -cp - avl_insert(n->subnet_tree, subnet); -cp -} + splay_insert(subnet_tree, subnet); + if (n) + splay_insert(n->subnet_tree, subnet); -void subnet_del(node_t *n, subnet_t *subnet) -{ -cp - avl_delete(n->subnet_tree, subnet); -cp - avl_delete(subnet_tree, subnet); -cp + subnet_cache_flush(); } -/* Ascii representation of subnets */ - -subnet_t *str2net(char *subnetstr) -{ - int i, l; - subnet_t *subnet; - unsigned short int x[8]; -cp - subnet = new_subnet(); -cp - 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; - for(i = 0; i < 4; i++) - subnet->net.ipv4.address.x[i] = x[i]; - return 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; - for(i = 0; i < 8; i++) - subnet->net.ipv6.address.x[i] = htons(x[i]); - return subnet; - } - - 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]; - return subnet; - } - - 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(i = 0; i < 8; i++) - subnet->net.ipv6.address.x[i] = htons(x[i]); - return subnet; - } - - 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]; - return subnet; - } - - free(subnet); - return NULL; -} +void subnet_del(node_t *n, subnet_t *subnet) { + if (n) + splay_delete(n->subnet_tree, subnet); + splay_delete(subnet_tree, subnet); -char *net2str(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: - syslog(LOG_ERR, _("net2str() was called with unknown subnet type %d, exitting!"), subnet->type); - cp_trace(); - exit(0); - } -cp - return netstr; + subnet_cache_flush(); } /* Subnet lookup routines */ -subnet_t *lookup_subnet(node_t *owner, subnet_t *subnet) -{ -cp - return avl_search(owner->subnet_tree, subnet); +subnet_t *lookup_subnet(const node_t *owner, const subnet_t *subnet) { + return splay_search(owner->subnet_tree, subnet); } -subnet_t *lookup_subnet_mac(mac_t *address) -{ - subnet_t subnet, *p; -cp - subnet.type = SUBNET_MAC; - memcpy(&subnet.net.mac.address, address, sizeof(mac_t)); +subnet_t *lookup_subnet_mac(const node_t *owner, const mac_t *address) { + subnet_t *r = NULL; + + // Check if this address is cached + + if((r = hash_search(mac_cache, address))) + return r; + + // Search all subnets for a matching one + + for splay_each(subnet_t, p, owner ? owner->subnet_tree : subnet_tree) { + if(!p || p->type != SUBNET_MAC) + continue; + + if(!memcmp(address, &p->net.mac.address, sizeof *address)) { + r = p; + if(!p->owner || p->owner->status.reachable) + break; + } + } + + // Cache the result - p = (subnet_t *)avl_search(subnet_tree, &subnet); -cp - return p; + if(r) + hash_insert(mac_cache, address, r); + + return r; +} + +subnet_t *lookup_subnet_ipv4(const ipv4_t *address) { + subnet_t *r = NULL; + + // Check if this address is cached + + if((r = hash_search(ipv4_cache, address))) + return r; + + // Search all subnets for a matching one + + for splay_each(subnet_t, p, subnet_tree) { + if(!p || p->type != SUBNET_IPV4) + continue; + + if(!maskcmp(address, &p->net.ipv4.address, p->net.ipv4.prefixlength)) { + r = p; + if(!p->owner || p->owner->status.reachable) + break; + } + } + + // Cache the result + + if(r) + hash_insert(ipv4_cache, address, r); + + return r; } -subnet_t *lookup_subnet_ipv4(ipv4_t *address) -{ - subnet_t subnet, *p; -cp - subnet.type = SUBNET_IPV4; - memcpy(&subnet.net.ipv4.address, address, sizeof(ipv4_t)); - subnet.net.ipv4.prefixlength = 32; - - do - { - /* Go find subnet */ - - p = (subnet_t *)avl_search_closest_smaller(subnet_tree, &subnet); - - /* Check if the found subnet REALLY matches */ -cp - if(p) - { - if(p->type != SUBNET_IPV4) - { - p = NULL; - break; - } - - if (!maskcmp((char *)address, (char *)&p->net.ipv4.address, p->net.ipv4.prefixlength, sizeof(ipv4_t))) - break; - else - { - /* Otherwise, see if there is a bigger enclosing subnet */ - - subnet.net.ipv4.prefixlength = p->net.ipv4.prefixlength - 1; - maskcpy((char *)&subnet.net.ipv4.address, (char *)&p->net.ipv4.address, subnet.net.ipv4.prefixlength, sizeof(ipv4_t)); - } - } - } while (p); -cp - return p; +subnet_t *lookup_subnet_ipv6(const ipv6_t *address) { + subnet_t *r = NULL; + + // Check if this address is cached + + if((r = hash_search(ipv6_cache, address))) + return r; + + // Search all subnets for a matching one + + for splay_each(subnet_t, p, subnet_tree) { + if(!p || p->type != SUBNET_IPV6) + continue; + + if(!maskcmp(address, &p->net.ipv6.address, p->net.ipv6.prefixlength)) { + r = p; + if(!p->owner || p->owner->status.reachable) + break; + } + } + + // Cache the result + + if(r) + hash_insert(ipv6_cache, address, r); + + return r; } -subnet_t *lookup_subnet_ipv6(ipv6_t *address) -{ - subnet_t subnet, *p; -cp - subnet.type = SUBNET_IPV6; - memcpy(&subnet.net.ipv6.address, address, sizeof(ipv6_t)); - subnet.net.ipv6.prefixlength = 128; - - do - { - /* Go find subnet */ - - p = (subnet_t *)avl_search_closest_smaller(subnet_tree, &subnet); - - /* Check if the found subnet REALLY matches */ - -cp - if(p) - { - if(p->type != SUBNET_IPV6) - return NULL; - - if (!maskcmp((char *)address, (char *)&p->net.ipv6.address, p->net.ipv6.prefixlength, sizeof(ipv6_t))) - break; - else - { - /* Otherwise, see if there is a bigger enclosing subnet */ - - subnet.net.ipv6.prefixlength = p->net.ipv6.prefixlength - 1; - maskcpy((char *)&subnet.net.ipv6.address, (char *)&p->net.ipv6.address, subnet.net.ipv6.prefixlength, sizeof(ipv6_t)); - } - } - } while (p); -cp - return p; +void subnet_update(node_t *owner, subnet_t *subnet, bool up) { + char netstr[MAXNETSTR]; + char *name, *address, *port; + char empty[] = ""; + + // Prepare environment variables to be passed to the script + + char *envp[10] = {NULL}; + int n = 0; + xasprintf(&envp[n++], "NETNAME=%s", netname ? : ""); + xasprintf(&envp[n++], "DEVICE=%s", device ? : ""); + xasprintf(&envp[n++], "INTERFACE=%s", iface ? : ""); + xasprintf(&envp[n++], "NODE=%s", owner->name); + + if(owner != myself) { + sockaddr2str(&owner->address, &address, &port); + xasprintf(&envp[n++], "REMOTEADDRESS=%s", address); + xasprintf(&envp[n++], "REMOTEPORT=%s", port); + free(port); + free(address); + } + + xasprintf(&envp[n++], "NAME=%s", myself->name); + + name = up ? "subnet-up" : "subnet-down"; + + if(!subnet) { + for splay_each(subnet_t, subnet, owner->subnet_tree) { + 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[n]); + free(envp[n + 1]); + xasprintf(&envp[n], "SUBNET=%s", netstr); + xasprintf(&envp[n + 1], "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[n], "SUBNET=%s", netstr); + xasprintf(&envp[n + 1], "WEIGHT=%s", weight); + + execute_script(name, envp); + } + } + + for(int i = 0; envp[i] && i < 9; i++) + free(envp[i]); } -void dump_subnets(void) -{ - char *netstr; - subnet_t *subnet; - avl_node_t *node; -cp - syslog(LOG_DEBUG, _("Subnet list:")); - for(node = subnet_tree->head; node; node = node->next) - { - subnet = (subnet_t *)node->data; - netstr = net2str(subnet); - syslog(LOG_DEBUG, _(" %s owner %s"), netstr, subnet->owner->name); - free(netstr); - } - syslog(LOG_DEBUG, _("End of subnet list.")); -cp +bool dump_subnets(connection_t *c) { + for splay_each(subnet_t, subnet, subnet_tree) { + char netstr[MAXNETSTR]; + + if(!net2str(netstr, sizeof netstr, subnet)) + continue; + + send_request(c, "%d %d %s %s", + CONTROL, REQ_DUMP_SUBNETS, + netstr, subnet->owner ? subnet->owner->name : "(broadcast)"); + } + + return send_request(c, "%d %d", CONTROL, REQ_DUMP_SUBNETS); }