X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fsubnet.c;h=5e096252b8f4806daefd823731d2c5b6306cd0bb;hp=9a882570b7e3b8c9b228ba173f12e0688cffac9c;hb=ecad9e9289162faec7b678be54178d22876b5d90;hpb=950fb8e916b0e248dcaa72c96859acd6046683aa diff --git a/src/subnet.c b/src/subnet.c index 9a882570..5e096252 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) 2000-2002 Guus Sliepen , + 2000-2002 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 @@ -17,15 +17,122 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: subnet.c,v 1.1.2.2 2000/10/11 10:35:17 guus Exp $ + $Id: subnet.c,v 1.1.2.33 2002/03/12 14:20:44 guus Exp $ */ #include "config.h" -#include +#include +#include +#include +#include +#include +#include +#include + +#include #include -#include "subnet.h" +#include + +#include "conf.h" #include "net.h" +#include "node.h" +#include "subnet.h" +#include "netutl.h" + +#include "system.h" + +/* lists type of subnet */ + +avl_tree_t *subnet_tree; + +/* Subnet comparison */ + +int subnet_compare_mac(subnet_t *a, subnet_t *b) +{ +cp + return memcmp(&a->net.mac.address, &b->net.mac.address, sizeof(mac_t)); +} + +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; + + return a->net.ipv4.masklength - b->net.ipv4.masklength; +} + +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; + + return a->net.ipv6.masklength - b->net.ipv6.masklength; +} + +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; +} + +/* 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) +{ +cp + avl_delete_tree(subnet_tree); +cp +} + +avl_tree_t *new_subnet_tree(void) +{ +cp + return avl_alloc_tree((avl_compare_t)subnet_compare, NULL); +cp +} + +void free_subnet_tree(avl_tree_t *subnet_tree) +{ +cp + avl_delete_tree(subnet_tree); +cp +} /* Allocating and freeing space for subnets */ @@ -41,34 +148,25 @@ cp free(subnet); } -/* Linked list management */ +/* Adding and removing subnets */ -void subnet_add(conn_list_t *cl, subnet_t *subnet) +void subnet_add(node_t *n, subnet_t *subnet) { cp - /* FIXME: do sorting on netmask size if necessary */ + subnet->owner = n; - subnet->next = cl->subnets->next; - subnet->prev = NULL; - subnet->next->prev = subnet; - cl->subnets = subnet; + avl_insert(subnet_tree, subnet); +cp + avl_insert(n->subnet_tree, subnet); cp } -void subnet_del(conn_list_t *cl, subnet_t *subnet) +void subnet_del(node_t *n, 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); + avl_delete(n->subnet_tree, subnet); +cp + avl_delete(subnet_tree, subnet); cp } @@ -76,65 +174,65 @@ cp subnet_t *str2net(char *subnetstr) { - int type; + int i, l; subnet_t *subnet; + unsigned short int x[8]; cp - if(sscanf(subnetstr, "%d,", &type) != 1) - return NULL; - 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.masklength = 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.masklength = l; + for(i = 0; i < 8; i++) + subnet->net.ipv6.address.x[i] = htons(x[i]); + return subnet; + } - switch(type) + if(sscanf(subnetstr, "%hu.%hu.%hu.%hu", + &x[0], &x[1], &x[2], &x[3]) == 4) { - case SUBNET_MAC: - if(sscanf(netstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &subnet->type, - &subnet->net.mac.x[0], - &subnet->net.mac.x[1], - &subnet->net.mac.x[2], - &subnet->net.mac.x[3], - &subnet->net.mac.x[4], - &subnet->net.mac.x[5]) != 7) - { - free_subnet(subnet); - return NULL; - } - break; - case SUBNET_IPv4: - if(sscanf(subnetstr, "%d,%lx:%lx", &subnet->type, &subnet->net.ipv4.address, &subnet->net.ipv4.mask) != 3) - { - free_subnet(subnet); - return NULL; - } - break; - case SUBNET_IPv6: - if(sscanf(netstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", &subnet->type, - &subnet->net.ipv6.address.x[0], - &subnet->net.ipv6.address.x[1], - &subnet->net.ipv6.address.x[2], - &subnet->net.ipv6.address.x[3], - &subnet->net.ipv6.address.x[4], - &subnet->net.ipv6.address.x[5], - &subnet->net.ipv6.address.x[6], - &subnet->net.ipv6.address.x[7], - &subnet->net.ipv6.mask.x[0], - &subnet->net.ipv6.mask.x[1], - &subnet->net.ipv6.mask.x[2], - &subnet->net.ipv6.mask.x[3], - &subnet->net.ipv6.mask.x[4], - &subnet->net.ipv6.mask.x[5], - &subnet->net.ipv6.mask.x[6], - &subnet->net.ipv6.mask.x[7]) != 17) - { - free_subnet(subnet); - return NULL; - } - break; - break; - default: - free_subnet(subnet); - return NULL; -cp - return subnet; + subnet->type = SUBNET_IPV4; + subnet->net.ipv4.masklength = 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.masklength = 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; } char *net2str(subnet_t *subnet) @@ -144,35 +242,38 @@ cp switch(subnet->type) { case SUBNET_MAC: - asprintf(netstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", subnet->type, - subnet->net.mac.x[0], - subnet->net.mac.x[1], - subnet->net.mac.x[2], - subnet->net.mac.x[3], - subnet->net.mac.x[4], - subnet->net.mac.x[5]); - case SUBNET_IPv4: - asprintf(netstr, "%d,%lx:%lx", subnet->type, subnet->net.ipv4.address, subnet->net.ipv4.mask); - case SUBNET_IPv6: - asprintf(netstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", - subnet->net.ipv6.address.x[0], - subnet->net.ipv6.address.x[1], - subnet->net.ipv6.address.x[2], - subnet->net.ipv6.address.x[3], - subnet->net.ipv6.address.x[4], - subnet->net.ipv6.address.x[5], - subnet->net.ipv6.address.x[6], - subnet->net.ipv6.address.x[7], - subnet->net.ipv6.mask.x[0], - subnet->net.ipv6.mask.x[1], - subnet->net.ipv6.mask.x[2], - subnet->net.ipv6.mask.x[3], - subnet->net.ipv6.mask.x[4], - subnet->net.ipv6.mask.x[5], - subnet->net.ipv6.mask.x[6], - subnet->net.ipv6.mask.x[7]); + 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.masklength); + 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.masklength); + break; default: - netstr = NULL; + syslog(LOG_ERR, _("net2str() was called with unknown subnet type %d, exitting!"), subnet->type); + cp_trace(); + exit(0); } cp return netstr; @@ -180,49 +281,114 @@ cp /* Subnet lookup routines */ -subnet_t *lookup_subnet_mac(subnet_t *subnets, mac_t address) +subnet_t *lookup_subnet(node_t *owner, subnet_t *subnet) { - subnet_t *subnet; +cp + return avl_search(owner->subnet_tree, subnet); +} + +subnet_t *lookup_subnet_mac(mac_t *address) +{ + subnet_t subnet, *p; cp - for(subnet = subnets; subnet != NULL; subnet = subnet->next) - { - if(subnet->type == SUBNET_MAC) - if(memcmp(&address, &subnet->net.mac.address, sizeof(address)) == 0) - break; - } + subnet.type = SUBNET_MAC; + memcpy(&subnet.net.mac.address, address, sizeof(mac_t)); + + p = (subnet_t *)avl_search(subnet_tree, &subnet); cp - return subnet; + return p; } -subnet_t *lookup_subnet_ipv4(subnet_t *subnets, ipv4_t address) +subnet_t *lookup_subnet_ipv4(ipv4_t *address) { - subnet_t *subnet; + subnet_t subnet, *p; cp - for(subnet = subnets; subnet != NULL; subnet = subnet->next) - { - if(subnet->type == SUBNET_IPV4) - if((address & subnet->net.ipv4.mask) == subnet->net.ipv4.address) + subnet.type = SUBNET_IPV4; + memcpy(&subnet.net.ipv4.address, address, sizeof(ipv4_t)); + subnet.net.ipv4.masklength = 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.masklength, sizeof(ipv4_t))) break; - } + else + { + /* Otherwise, see if there is a bigger enclosing subnet */ + + subnet.net.ipv4.masklength = p->net.ipv4.masklength - 1; + maskcpy((char *)&subnet.net.ipv4.address, (char *)&p->net.ipv4.address, subnet.net.ipv4.masklength, sizeof(ipv4_t)); + } + } + } while (p); cp - return subnet; + return p; } -subnet_t *lookup_subnet_ipv6(subnet_t *subnets, ipv6_t address) +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.masklength = 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.masklength, sizeof(ipv6_t))) + break; + else + { + /* Otherwise, see if there is a bigger enclosing subnet */ + + subnet.net.ipv6.masklength = p->net.ipv6.masklength - 1; + maskcpy((char *)&subnet.net.ipv6.address, (char *)&p->net.ipv6.address, subnet.net.ipv6.masklength, sizeof(ipv6_t)); + } + } + } while (p); +cp + return p; +} + +void dump_subnets(void) +{ + char *netstr; subnet_t *subnet; + avl_node_t *node; cp - for(subnet = subnets; subnet != NULL; subnet = subnet->next) + syslog(LOG_DEBUG, _("Subnet list:")); + for(node = subnet_tree->head; node; node = node->next) { - if(subnet->type == SUBNET_IPV6) - { - for(i=0; i<8; i++) - if((address.x[i] & subnet->net.ipv6.mask.x[i]) != subnet->net.ipv6.address.x[i]) - break; - if(i=8) - break; - } + 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 - return subnet; }