/*
subnet.c -- handle subnet lookups and lists
- Copyright (C) 2000-2012 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
#include "splay_tree.h"
#include "control_common.h"
-#include "device.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 */
-
-splay_tree_t *subnet_tree;
+uint32_t hash_seed;
+splay_tree_t subnet_tree = {
+ .compare = (splay_compare_t) subnet_compare,
+ .delete = (splay_action_t) free_subnet,
+};
/* Subnet lookup cache */
-hash_t *ipv4_cache;
-hash_t *ipv6_cache;
-hash_t *mac_cache;
+static uint32_t wrapping_add32(uint32_t a, uint32_t b) {
+ return (uint32_t)((uint64_t)a + b);
+}
-void subnet_cache_flush(void) {
- hash_clear(ipv4_cache);
- hash_clear(ipv6_cache);
- hash_clear(mac_cache);
+static uint32_t wrapping_mul32(uint32_t a, uint32_t b) {
+ return (uint32_t)((uint64_t)a * b);
}
-/* Initialising trees */
+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
+}
-void init_subnets(void) {
- subnet_tree = splay_alloc_tree((splay_compare_t) subnet_compare, (splay_action_t) free_subnet);
- ipv4_cache = hash_alloc(0x100, sizeof(ipv4_t));
- ipv6_cache = hash_alloc(0x100, sizeof(ipv6_t));
- mac_cache = hash_alloc(0x100, sizeof(mac_t));
+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;
}
-void exit_subnets(void) {
- splay_delete_tree(subnet_tree);
+static uint32_t hash_function_mac_t(const mac_t *p) {
+ uint16_t *halfwidth = (uint16_t *)p;
+ uint32_t hash = hash_seed;
- hash_free(ipv4_cache);
- hash_free(ipv6_cache);
- hash_free(mac_cache);
+ for(int i = 0; i < 3; i++) {
+ hash = wrapping_add32(hash, halfwidth[i]);
+ hash = wrapping_mul32(hash, 0x9e370001U);
+ }
+
+ return hash;
}
-splay_tree_t *new_subnet_tree(void) {
- return splay_alloc_tree((splay_compare_t) subnet_compare, 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 = prng(UINT32_MAX);
+
+ // tables need to be cleared on startup
+ subnet_cache_flush_tables();
}
-void free_subnet_tree(splay_tree_t *subnet_tree) {
- splay_delete_tree(subnet_tree);
+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) {
- return xmalloc_and_zero(sizeof(subnet_t));
+ return xzalloc(sizeof(subnet_t));
}
void free_subnet(subnet_t *subnet) {
free(subnet);
}
+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);
+}
+
+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;
+ }
+
+ 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);
+}
+
/* Adding and removing subnets */
void subnet_add(node_t *n, subnet_t *subnet) {
subnet->owner = n;
- splay_insert(subnet_tree, subnet);
- splay_insert(n->subnet_tree, subnet);
+ splay_insert(&subnet_tree, subnet);
+
+ if(n) {
+ splay_insert(&n->subnet_tree, subnet);
+ }
- subnet_cache_flush();
+ subnet_cache_flush(subnet);
}
void subnet_del(node_t *n, subnet_t *subnet) {
- splay_delete(n->subnet_tree, subnet);
- splay_delete(subnet_tree, subnet);
+ if(n) {
+ splay_delete(&n->subnet_tree, subnet);
+ }
+
+ splay_delete(&subnet_tree, subnet);
- subnet_cache_flush();
+ subnet_cache_flush(subnet);
}
/* Subnet lookup routines */
-subnet_t *lookup_subnet(const node_t *owner, const subnet_t *subnet) {
- return splay_search(owner->subnet_tree, 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 *p, *r = NULL;
- splay_node_t *n;
+ subnet_t *r = NULL;
// Check if this address is cached
- if((r = hash_search(mac_cache, address)))
+ if((r = hash_search(mac_t, &mac_cache, address))) {
return r;
+ }
// Search all subnets for a matching one
- for(n = owner ? owner->subnet_tree->head : subnet_tree->head; n; n = n->next) {
- p = n->data;
-
- if(!p || p->type != SUBNET_MAC)
+ 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)) {
+ if(!memcmp(address, &p->net.mac.address, sizeof(*address))) {
r = p;
- if(p->owner->status.reachable)
+
+ if(!p->owner || p->owner->status.reachable) {
break;
+ }
}
}
// Cache the result
- if(r)
- hash_insert(mac_cache, address, r);
+ if(r) {
+ hash_insert(mac_t, &mac_cache, address, r);
+ }
return r;
}
subnet_t *lookup_subnet_ipv4(const ipv4_t *address) {
- subnet_t *p, *r = NULL;
- splay_node_t *n;
+ subnet_t *r = NULL;
// Check if this address is cached
- if((r = hash_search(ipv4_cache, address)))
+ if((r = hash_search(ipv4_t, &ipv4_cache, address))) {
return r;
+ }
// Search all subnets for a matching one
- for(n = subnet_tree->head; n; n = n->next) {
- p = n->data;
-
- if(!p || p->type != SUBNET_IPV4)
+ 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->status.reachable)
+
+ if(!p->owner || p->owner->status.reachable) {
break;
+ }
}
}
// Cache the result
- if(r)
- hash_insert(ipv4_cache, address, r);
+ if(r) {
+ hash_insert(ipv4_t, &ipv4_cache, address, r);
+ }
return r;
}
subnet_t *lookup_subnet_ipv6(const ipv6_t *address) {
- subnet_t *p, *r = NULL;
- splay_node_t *n;
+ subnet_t *r = NULL;
// Check if this address is cached
- if((r = hash_search(ipv6_cache, address)))
+ if((r = hash_search(ipv6_t, &ipv6_cache, address))) {
return r;
+ }
// Search all subnets for a matching one
- for(n = subnet_tree->head; n; n = n->next) {
- p = n->data;
-
- if(!p || p->type != SUBNET_IPV6)
+ 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->status.reachable)
+
+ if(!p->owner || p->owner->status.reachable) {
break;
+ }
}
}
// Cache the result
- if(r)
- hash_insert(ipv6_cache, address, r);
+ if(r) {
+ hash_insert(ipv6_t, &ipv6_cache, address, r);
+ }
return r;
}
void subnet_update(node_t *owner, subnet_t *subnet, bool up) {
- splay_node_t *node;
- int i;
- char *envp[9] = {NULL};
+ if(!sandbox_can(START_PROCESSES, RIGHT_NOW)) {
+ return;
+ }
+
char netstr[MAXNETSTR];
- char *name, *address, *port;
+ char *address, *port;
char empty[] = "";
// Prepare environment variables to be passed to the script
- xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
- xasprintf(&envp[1], "DEVICE=%s", device ? : "");
- xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
- xasprintf(&envp[3], "NODE=%s", owner->name);
+ environment_t env;
+ environment_init(&env);
+ environment_add(&env, "NODE=%s", owner->name);
if(owner != myself) {
sockaddr2str(&owner->address, &address, &port);
- // 4 and 5 are reserved for SUBNET and WEIGHT
- xasprintf(&envp[6], "REMOTEADDRESS=%s", address);
- xasprintf(&envp[7], "REMOTEPORT=%s", port);
+ environment_add(&env, "REMOTEADDRESS=%s", address);
+ environment_add(&env, "REMOTEPORT=%s", port);
free(port);
free(address);
}
- name = up ? "subnet-up" : "subnet-down";
+ int env_subnet = environment_add(&env, NULL);
+ int env_weight = environment_add(&env, NULL);
+
+ const char *name = up ? "subnet-up" : "subnet-down";
if(!subnet) {
- for(node = owner->subnet_tree->head; node; node = node->next) {
- subnet = node->data;
- if(!net2str(netstr, sizeof netstr, 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)
+
+ if(weight) {
*weight++ = 0;
- else
+ } else {
weight = empty;
+ }
// Prepare the SUBNET and WEIGHT variables
- if(envp[4])
- free(envp[4]);
- if(envp[5])
- free(envp[5]);
- xasprintf(&envp[4], "SUBNET=%s", netstr);
- xasprintf(&envp[5], "WEIGHT=%s", weight);
-
- execute_script(name, envp);
+ 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)) {
+ 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)
+
+ if(weight) {
*weight++ = 0;
- else
+ } else {
weight = empty;
+ }
// Prepare the SUBNET and WEIGHT variables
- xasprintf(&envp[4], "SUBNET=%s", netstr);
- xasprintf(&envp[5], "WEIGHT=%s", weight);
+ environment_update(&env, env_subnet, "SUBNET=%s", netstr);
+ environment_update(&env, env_weight, "WEIGHT=%s", weight);
- execute_script(name, envp);
+ execute_script(name, &env);
}
}
- for(i = 0; envp[i] && i < 8; i++)
- free(envp[i]);
+ environment_exit(&env);
}
bool dump_subnets(connection_t *c) {
- char netstr[MAXNETSTR];
- subnet_t *subnet;
- splay_node_t *node;
+ for splay_each(subnet_t, subnet, &subnet_tree) {
+ char netstr[MAXNETSTR];
- 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;
+ }
+
send_request(c, "%d %d %s %s",
- CONTROL, REQ_DUMP_SUBNETS,
- netstr, subnet->owner->name);
+ CONTROL, REQ_DUMP_SUBNETS,
+ netstr, subnet->owner ? subnet->owner->name : "(broadcast)");
}
return send_request(c, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
projects / tinc / blobdiff