X-Git-Url: https://tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fsubnet.c;h=fa00cd8873a7005ccb46c2d1039bf6ec5c5cc06b;hb=04d8a8e34e1fe7f33f1946863b36a24ee358175f;hp=6ca3feef0d9a0158e9c0104c57eec2fd44071dfa;hpb=698191fd2f512f3618e2d60592fcd57cd750b965;p=tinc diff --git a/src/subnet.c b/src/subnet.c index 6ca3feef..17dd39e8 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) 2000-2017 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 @@ -13,298 +13,391 @@ 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 1.1.2.11 2000/11/04 22:57:33 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 -#include +#include "system.h" -#include "conf.h" +#include "splay_tree.h" +#include "control_common.h" +#include "hash.h" +#include "logger.h" #include "net.h" +#include "netutl.h" +#include "node.h" +#include "script.h" #include "subnet.h" -#include "system.h" - -#include -#include +#include "xalloc.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, +}; + +/* Subnet lookup cache */ + +static uint32_t wrapping_add32(uint32_t a, uint32_t b) { + return (uint32_t)((uint64_t)a + b); +} + +static uint32_t wrapping_mul32(uint32_t a, uint32_t b) { + return (uint32_t)((uint64_t)a * b); +} + +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 +} + + +static uint32_t hash_function_ipv6_t(const ipv6_t *p) { + uint32_t *fullwidth = (uint32_t *)p; + uint32_t hash = hash_seed; + + for(int i = 0; i < 4; i++) { + hash = wrapping_add32(hash, fullwidth[i]); + hash = wrapping_mul32(hash, 0x9e370001U); + } + + return hash; +} + +static uint32_t hash_function_mac_t(const mac_t *p) { + uint16_t *halfwidth = (uint16_t *)p; + uint32_t hash = hash_seed; + + for(int i = 0; i < 3; i++) { + hash = wrapping_add32(hash, halfwidth[i]); + hash = wrapping_mul32(hash, 0x9e370001U); + } + + return hash; +} -subnet_t *subnet_list[SUBNET_TYPES] = { NULL }; +hash_define(ipv4_t, SUBNET_HASH_SIZE) +hash_define(ipv6_t, SUBNET_HASH_SIZE) +hash_define(mac_t, SUBNET_HASH_SIZE) + +hash_new(ipv4_t, ipv4_cache); +hash_new(ipv6_t, ipv6_cache); +hash_new(mac_t, mac_cache); + + +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(stype != SUBNET_IPV6) { // ipv4 + hash_clear(ipv4_t, &ipv4_cache); + } + + if(stype != SUBNET_IPV4) { // ipv6 + hash_clear(ipv6_t, &ipv6_cache); + } + + hash_clear(mac_t, &mac_cache); +} + +/* Initialising trees */ + +void init_subnets(void) { + hash_seed = (uint32_t)rand(); + + // tables need to be cleared on startup + subnet_cache_flush_tables(); +} + +void exit_subnets(void) { + splay_empty_tree(&subnet_tree); + subnet_cache_flush_tables(); +} + +void init_subnet_tree(splay_tree_t *tree) { + memset(tree, 0, sizeof(*tree)); + tree->compare = (splay_compare_t) subnet_compare; +} /* 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); } -/* Linked list management */ - -void subnet_add(conn_list_t *cl, subnet_t *subnet) -{ - subnet_t *p = NULL; - subnet_t *q = NULL; -cp - subnet->owner = cl; - - /* Link it into the owners list of subnets (unsorted) */ - - subnet->next = cl->subnets; - subnet->prev = NULL; - if(subnet->next) - subnet->next->prev = subnet; - cl->subnets = subnet; - - /* And now add it to the global subnet list (sorted) */ - - /* Sort on size of subnet mask (IPv4 only at the moment!) - - Three cases: subnet_list[] = NULL -> just add this subnet - insert before first -> add it in front of list - rest: insert after another subnet - */ -cp - if(subnet_list[subnet->type]) - { - p = q = subnet_list[subnet->type]; - - for(; p; p = p->global_next) - { - if(subnet->net.ipv4.mask >= p->net.ipv4.mask) - break; - - q = p; - } - } -cp - if(p == subnet_list[subnet->type]) /* First two cases */ - { - /* Insert in front */ - subnet->global_next = subnet_list[subnet->type]; - subnet->global_prev = NULL; - subnet_list[subnet->type] = subnet; - } - else /* Third case */ - { - /* Insert after q */ - subnet->global_next = q->global_next; - subnet->global_prev = q; - q->global_next = subnet; - } -cp - if(subnet->global_next) - subnet->global_next->global_prev = subnet; -cp +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); } -void subnet_del(subnet_t *subnet) -{ -cp - /* Remove it from owner's list */ - - if(subnet->prev) - subnet->prev->next = subnet->next; - else - subnet->owner->subnets = subnet->next; - - if(subnet->next) - subnet->next->prev = subnet->prev; - - /* Remove it from the global list */ - - if(subnet->global_prev) - subnet->global_prev->global_next = subnet->global_next; - else - subnet_list[subnet->type] = subnet->global_next; - - if(subnet->global_next) - subnet->global_next->global_prev = subnet->global_prev; - - free_subnet(subnet); -cp +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; + } + + break; + + case SUBNET_IPV6: + if(subnet->net.ipv4.prefixlength == 128) { + hash_delete(ipv6_t, &ipv6_cache, &subnet->net.ipv6.address); + return; + } + + break; + + case SUBNET_MAC: + hash_delete(mac_t, &mac_cache, &subnet->net.mac.address); + return; + } + + subnet_cache_flush_table(subnet->type); } -/* Ascii representation of subnets */ - -subnet_t *str2net(char *subnetstr) -{ - int type; - subnet_t *subnet; -cp - if(sscanf(subnetstr, "%d,", &type) != 1) - return NULL; -cp - subnet = new_subnet(); -cp - switch(type) - { - case SUBNET_MAC: - if(sscanf(subnetstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &subnet->type, - &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]) != 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(subnetstr, "%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; - default: - free_subnet(subnet); - return NULL; - } -cp - return subnet; +/* Adding and removing subnets */ + +void subnet_add(node_t *n, subnet_t *subnet) { + subnet->owner = n; + + splay_insert(&subnet_tree, subnet); + + if(n) { + splay_insert(&n->subnet_tree, subnet); + } + + subnet_cache_flush(subnet); } -char *net2str(subnet_t *subnet) -{ - char *netstr; -cp - switch(subnet->type) - { - case SUBNET_MAC: - asprintf(&netstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", subnet->type, - 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, "%d,%lx/%lx", subnet->type, subnet->net.ipv4.address, subnet->net.ipv4.mask); - break; - case SUBNET_IPV6: - asprintf(&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]); - break; - default: - asprintf(&netstr, _("unknown")); - } -cp - return netstr; +void subnet_del(node_t *n, subnet_t *subnet) { + if(n) { + splay_delete(&n->subnet_tree, subnet); + } + + splay_delete(&subnet_tree, subnet); + + subnet_cache_flush(subnet); } /* Subnet lookup routines */ -subnet_t *lookup_subnet_mac(mac_t address) -{ - subnet_t *subnet; -cp - for(subnet = subnet_list[SUBNET_MAC]; subnet != NULL; subnet = subnet->global_next) - { - if(memcmp(&address, &subnet->net.mac.address, sizeof(address)) == 0) - break; - } -cp - return subnet; +subnet_t *lookup_subnet(node_t *owner, const subnet_t *subnet) { + return splay_search(&owner->subnet_tree, subnet); +} + +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_t, &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 + + if(r) { + hash_insert(mac_t, &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_t, &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_t, &ipv4_cache, address, r); + } + + return r; } -subnet_t *lookup_subnet_ipv4(ipv4_t address) -{ - subnet_t *subnet; -cp - for(subnet = subnet_list[SUBNET_IPV4]; subnet != NULL; subnet = subnet->global_next) - { - if((address & subnet->net.ipv4.mask) == subnet->net.ipv4.address) - break; - } -cp - return subnet; +subnet_t *lookup_subnet_ipv6(const ipv6_t *address) { + subnet_t *r = NULL; + + // Check if this address is cached + + if((r = hash_search(ipv6_t, &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_t, &ipv6_cache, address, r); + } + + return r; } -subnet_t *lookup_subnet_ipv6(ipv6_t address) -{ - subnet_t *subnet; - int i; -cp - for(subnet = subnet_list[SUBNET_IPV6]; subnet != NULL; subnet = subnet->global_next) - { - 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; - } -cp - return subnet; +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 + + environment_t env; + environment_init(&env); + environment_add(&env, "NODE=%s", owner->name); + + if(owner != myself) { + sockaddr2str(&owner->address, &address, &port); + environment_add(&env, "REMOTEADDRESS=%s", address); + environment_add(&env, "REMOTEPORT=%s", port); + free(port); + free(address); + } + + int env_subnet = environment_add(&env, NULL); + int env_weight = environment_add(&env, NULL); + + 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 + environment_update(&env, env_subnet, "SUBNET=%s", netstr); + environment_update(&env, env_weight, "WEIGHT=%s", weight); + + execute_script(name, &env); + } + } 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 + environment_update(&env, env_subnet, "SUBNET=%s", netstr); + environment_update(&env, env_weight, "WEIGHT=%s", weight); + + execute_script(name, &env); + } + } + + environment_exit(&env); } -void dump_subnet_list(void) -{ - subnet_t *subnet; - char *netstr; -cp - syslog(LOG_DEBUG, _("Subnet list:")); - - for(subnet = subnet_list[SUBNET_IPV4]; subnet != NULL; subnet = subnet->global_next) - { - 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); }