/*
subnet.c -- handle subnet lookups and lists
- Copyright (C) 2000-2007 Guus Sliepen <guus@tinc-vpn.org>,
+ Copyright (C) 2000-2022 Guus Sliepen <guus@tinc-vpn.org>,
2000-2005 Ivo Timmermans
This program is free software; you can redistribute it and/or modify
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;
+static uint32_t hash_function_mac_t(const mac_t *p) {
+ uint16_t *halfwidth = (uint16_t *)p;
+ uint32_t hash = hash_seed;
- result = memcmp(&a->net.ipv6.address, &b->net.ipv6.address, sizeof(ipv6_t));
+ for(int i = 0; i < 3; i++) {
+ hash = wrapping_add32(hash, halfwidth[i]);
+ hash = wrapping_mul32(hash, 0x9e370001U);
+ }
- if(result)
- return result;
+ return hash;
+}
- result = a->net.ipv6.prefixlength - b->net.ipv6.prefixlength;
+hash_define(ipv4_t, SUBNET_HASH_SIZE)
+hash_define(ipv6_t, SUBNET_HASH_SIZE)
+hash_define(mac_t, SUBNET_HASH_SIZE)
- if(result || !a->owner || !b->owner)
- return result;
+hash_new(ipv4_t, ipv4_cache);
+hash_new(ipv6_t, ipv6_cache);
+hash_new(mac_t, mac_cache);
- return strcmp(a->owner->name, b->owner->name);
-}
-int subnet_compare(const subnet_t *a, const subnet_t *b)
-{
- int result;
+void subnet_cache_flush_table(subnet_type_t stype) {
+ // NOTE: a subnet type of SUBNET_TYPES can be used to clear all hash tables
- result = a->type - b->type;
-
- 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];
-
- cp();
-
- if(sscanf(subnetstr, "%hu.%hu.%hu.%hu/%d",
- &x[0], &x[1], &x[2], &x[3], &l) == 5) {
- if(l < 0 || l > 32)
- return false;
+void subnet_del(node_t *n, subnet_t *subnet) {
+ if(n) {
+ splay_delete(&n->subnet_tree, subnet);
+ }
- subnet->type = SUBNET_IPV4;
- subnet->net.ipv4.prefixlength = l;
+ splay_delete(&subnet_tree, subnet);
- for(i = 0; i < 4; i++) {
- if(x[i] > 255)
- return false;
- subnet->net.ipv4.address.x[i] = x[i];
- }
+ subnet_cache_flush(subnet);
+}
- return true;
- }
+/* Subnet lookup routines */
- 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) {
- if(l < 0 || l > 128)
- return false;
+subnet_t *lookup_subnet(node_t *owner, const subnet_t *subnet) {
+ return splay_search(&owner->subnet_tree, subnet);
+}
- 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;
+ // Search all subnets for a matching one
- for(i = 0; i < 4; i++) {
- if(x[i] > 255)
- return false;
- subnet->net.ipv4.address.x[i] = x[i];
+ for splay_each(subnet_t, p, owner ? &owner->subnet_tree : &subnet_tree) {
+ if(!p || p->type != SUBNET_MAC) {
+ continue;
}
- return true;
- }
+ if(!memcmp(address, &p->net.mac.address, sizeof(*address))) {
+ r = p;
- 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 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();
+subnet_t *lookup_subnet_ipv4(const ipv4_t *address) {
+ subnet_t *r = NULL;
- if(!netstr || !subnet) {
- logger(LOG_ERR, _("net2str() was called with netstr=%p, subnet=%p!\n"), netstr, subnet);
- return false;
- }
+ // Check if this address is cached
- 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);
+ if((r = hash_search(ipv4_t, &ipv4_cache, address))) {
+ return r;
}
- return true;
-}
-
-/* Subnet lookup routines */
-
-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))
- break;
- else {
- /* Otherwise, see if there is a bigger enclosing subnet */
+ // Cache the result
- subnet.net.ipv4.prefixlength = p->net.ipv4.prefixlength - 1;
- if(subnet.net.ipv4.prefixlength < 0 || subnet.net.ipv4.prefixlength > 32)
- return NULL;
- 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};
-
- cp();
+void subnet_update(node_t *owner, subnet_t *subnet, bool up) {
+ if(!sandbox_can(START_PROCESSES, RIGHT_NOW)) {
+ return;
+ }
- subnet.type = SUBNET_IPV6;
- subnet.net.ipv6.address = *address;
- subnet.net.ipv6.prefixlength = 128;
- subnet.owner = NULL;
+ char netstr[MAXNETSTR];
+ char *address, *port;
+ char empty[] = "";
- do {
- /* Go find subnet */
+ // Prepare environment variables to be passed to the script
- p = avl_search_closest_smaller(subnet_tree, &subnet);
+ environment_t env;
+ environment_init(&env);
+ environment_add(&env, "NODE=%s", owner->name);
- /* Check if the found subnet REALLY matches */
+ if(owner != myself) {
+ sockaddr2str(&owner->address, &address, &port);
+ environment_add(&env, "REMOTEADDRESS=%s", address);
+ environment_add(&env, "REMOTEPORT=%s", port);
+ free(port);
+ free(address);
+ }
- if(p) {
- if(p->type != SUBNET_IPV6)
- return NULL;
+ int env_subnet = environment_add(&env, NULL);
+ int env_weight = environment_add(&env, NULL);
- if(!maskcmp(address, &p->net.ipv6.address, p->net.ipv6.prefixlength))
- break;
- else {
- /* Otherwise, see if there is a bigger enclosing subnet */
+ const char *name = up ? "subnet-up" : "subnet-down";
- subnet.net.ipv6.prefixlength = p->net.ipv6.prefixlength - 1;
- if(subnet.net.ipv6.prefixlength < 0 || subnet.net.ipv6.prefixlength > 128)
- return NULL;
- maskcpy(&subnet.net.ipv6.address, &p->net.ipv6.address, subnet.net.ipv6.prefixlength, sizeof(ipv6_t));
+ if(!subnet) {
+ for splay_each(subnet_t, subnet, &owner->subnet_tree) {
+ if(!net2str(netstr, sizeof(netstr), subnet)) {
+ continue;
}
- }
- } while(p);
- return p;
-}
+ // Strip the weight from the subnet, and put it in its own environment variable
+ char *weight = strchr(netstr, '#');
-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;
+ if(weight) {
+ *weight++ = 0;
+ } else {
+ weight = empty;
+ }
- 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);
+ // Prepare the SUBNET and WEIGHT variables
+ environment_update(&env, env_subnet, "SUBNET=%s", netstr);
+ environment_update(&env, env_weight, "WEIGHT=%s", weight);
- 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);
}
- for(i = 0; i < (owner != myself ? 6 : 4); i++)
- free(envp[i]);
-
- if(owner != myself) {
- 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);
}
projects / tinc / blobdiff