/*
graph.c -- graph algorithms
- Copyright (C) 2001-2013 Guus Sliepen <guus@tinc-vpn.org>,
+ Copyright (C) 2001-2017 Guus Sliepen <guus@tinc-vpn.org>,
2001-2005 Ivo Timmermans
This program is free software; you can redistribute it and/or modify
#include "system.h"
-#include "config.h"
#include "connection.h"
-#include "device.h"
#include "edge.h"
#include "graph.h"
#include "list.h"
#include "logger.h"
-#include "names.h"
#include "netutl.h"
#include "node.h"
-#include "process.h"
#include "protocol.h"
+#include "script.h"
#include "subnet.h"
-#include "utils.h"
#include "xalloc.h"
-#include "graph.h"
/* Implementation of Kruskal's algorithm.
Running time: O(EN)
static void mst_kruskal(void) {
/* Clear MST status on connections */
- for list_each(connection_t, c, connection_list)
+ for list_each(connection_t, c, &connection_list) {
c->status.mst = false;
+ }
logger(DEBUG_SCARY_THINGS, LOG_DEBUG, "Running Kruskal's algorithm:");
/* Clear visited status on nodes */
- for splay_each(node_t, n, node_tree)
+ for splay_each(node_t, n, &node_tree) {
n->status.visited = false;
+ }
/* Starting point */
- for splay_each(edge_t, e, edge_weight_tree) {
+ for splay_each(edge_t, e, &edge_weight_tree) {
if(e->from->status.reachable) {
e->from->status.visited = true;
break;
bool skipped = false;
- for splay_each(edge_t, e, edge_weight_tree) {
+ for splay_each(edge_t, e, &edge_weight_tree) {
if(!e->reverse || (e->from->status.visited == e->to->status.visited)) {
skipped = true;
continue;
e->from->status.visited = true;
e->to->status.visited = true;
- if(e->connection)
+ if(e->connection) {
e->connection->status.mst = true;
+ }
- if(e->reverse->connection)
+ if(e->reverse->connection) {
e->reverse->connection->status.mst = true;
+ }
logger(DEBUG_SCARY_THINGS, LOG_DEBUG, " Adding edge %s - %s weight %d", e->from->name, e->to->name, e->weight);
if(skipped) {
skipped = false;
- next = edge_weight_tree->head;
+ next = edge_weight_tree.head;
}
}
}
/* Clear visited status on nodes */
- for splay_each(node_t, n, node_tree) {
+ for splay_each(node_t, n, &node_tree) {
n->status.visited = false;
n->status.indirect = true;
n->distance = -1;
for list_each(node_t, n, todo_list) { /* "n" is the node from which we start */
logger(DEBUG_SCARY_THINGS, LOG_DEBUG, " Examining edges from %s", n->name);
- if(n->distance < 0)
+ if(n->distance < 0) {
abort();
+ }
- for splay_each(edge_t, e, n->edge_tree) { /* "e" is the edge connected to "from" */
- if(!e->reverse)
+ for splay_each(edge_t, e, &n->edge_tree) { /* "e" is the edge connected to "from" */
+ if(!e->reverse || e->to == myself) {
continue;
+ }
/* Situation:
- /
- /
+ /
+ /
----->(n)---e-->(e->to)
- \
- \
+ \
+ \
Where e is an edge, (n) and (e->to) are nodes.
n->address is set to the e->address of the edge left of n to n.
bool indirect = n->status.indirect || e->options & OPTION_INDIRECT;
if(e->to->status.visited
- && (!e->to->status.indirect || indirect)
- && (e->to->distance != n->distance + 1 || e->weight >= e->to->prevedge->weight))
+ && (!e->to->status.indirect || indirect)
+ && (e->to->distance != n->distance + 1 || e->weight >= e->to->prevedge->weight)) {
continue;
+ }
+
+ // Only update nexthop if it doesn't increase the path length
+
+ if(!e->to->status.visited || (e->to->distance == n->distance + 1 && e->weight >= e->to->prevedge->weight)) {
+ e->to->nexthop = (n->nexthop == myself) ? e->to : n->nexthop;
+ }
e->to->status.visited = true;
e->to->status.indirect = indirect;
- e->to->nexthop = (n->nexthop == myself) ? e->to : n->nexthop;
e->to->prevedge = e;
e->to->via = indirect ? n->via : e->to;
e->to->options = e->options;
e->to->distance = n->distance + 1;
- if(!e->to->status.reachable || (e->to->address.sa.sa_family == AF_UNSPEC && e->address.sa.sa_family != AF_UNKNOWN))
+ if(!e->to->status.reachable || (e->to->address.sa.sa_family == AF_UNSPEC && e->address.sa.sa_family != AF_UNKNOWN)) {
update_node_udp(e->to, &e->address);
+ }
list_insert_tail(todo_list, e->to);
}
static void check_reachability(void) {
/* Check reachability status. */
- for splay_each(node_t, n, node_tree) {
+ int reachable_count = 0;
+ int became_reachable_count = 0;
+ int became_unreachable_count = 0;
+
+ for splay_each(node_t, n, &node_tree) {
if(n->status.visited != n->status.reachable) {
n->status.reachable = !n->status.reachable;
- n->last_state_change = time(NULL);
+ n->last_state_change = now.tv_sec;
if(n->status.reachable) {
logger(DEBUG_TRAFFIC, LOG_DEBUG, "Node %s (%s) became reachable",
- n->name, n->hostname);
+ n->name, n->hostname);
+
+ if(n != myself) {
+ became_reachable_count++;
+ }
} else {
logger(DEBUG_TRAFFIC, LOG_DEBUG, "Node %s (%s) became unreachable",
- n->name, n->hostname);
+ n->name, n->hostname);
+
+ if(n != myself) {
+ became_unreachable_count++;
+ }
}
- if(experimental && OPTION_VERSION(n->options) >= 2)
+ if(experimental && OPTION_VERSION(n->options) >= 2) {
n->status.sptps = true;
+ }
/* TODO: only clear status.validkey if node is unreachable? */
n->status.validkey = false;
+
if(n->status.sptps) {
sptps_stop(&n->sptps);
n->status.waitingforkey = false;
}
+
n->last_req_key = 0;
n->status.udp_confirmed = false;
n->maxmtu = MTU;
+ n->maxrecentlen = 0;
n->minmtu = 0;
n->mtuprobes = 0;
- timeout_del(&n->mtutimeout);
+ timeout_del(&n->udp_ping_timeout);
char *name;
char *address;
char *port;
- char *envp[7];
- xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
- xasprintf(&envp[1], "DEVICE=%s", device ? : "");
- xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
- xasprintf(&envp[3], "NODE=%s", n->name);
+ environment_t env;
+ environment_init(&env);
+ environment_add(&env, "NODE=%s", n->name);
sockaddr2str(&n->address, &address, &port);
- xasprintf(&envp[4], "REMOTEADDRESS=%s", address);
- xasprintf(&envp[5], "REMOTEPORT=%s", port);
- envp[6] = NULL;
+ environment_add(&env, "REMOTEADDRESS=%s", address);
+ environment_add(&env, "REMOTEPORT=%s", port);
- execute_script(n->status.reachable ? "host-up" : "host-down", envp);
+ execute_script(n->status.reachable ? "host-up" : "host-down", &env);
xasprintf(&name, n->status.reachable ? "hosts/%s-up" : "hosts/%s-down", n->name);
- execute_script(name, envp);
+ execute_script(name, &env);
free(name);
free(address);
free(port);
-
- for(int i = 0; i < 6; i++)
- free(envp[i]);
+ environment_exit(&env);
subnet_update(n, NULL, n->status.reachable);
if(!n->status.reachable) {
update_node_udp(n, NULL);
- memset(&n->status, 0, sizeof n->status);
+ memset(&n->status, 0, sizeof(n->status));
n->options = 0;
} else if(n->connection) {
- if(n->status.sptps) {
- if(n->connection->outgoing)
- send_req_key(n);
- } else {
+ // Speed up UDP probing by sending our key.
+ if(!n->status.sptps) {
send_ans_key(n);
}
}
}
+
+ if(n->status.reachable && n != myself) {
+ reachable_count++;
+ }
+ }
+
+ if(device_standby) {
+ if(reachable_count == 0 && became_unreachable_count > 0) {
+ device_disable();
+ } else if(reachable_count > 0 && reachable_count == became_reachable_count) {
+ device_enable();
+ }
}
}
void graph(void) {
- subnet_cache_flush();
+ subnet_cache_flush_tables();
sssp_bfs();
check_reachability();
mst_kruskal();