/*
graph.c -- graph algorithms
- Copyright (C) 2001-2003 Guus Sliepen <guus@sliepen.eu.org>,
- 2001-2003 Ivo Timmermans <ivo@o2w.nl>
+ Copyright (C) 2001-2004 Guus Sliepen <guus@tinc-vpn.org>,
+ 2001-2004 Ivo Timmermans <ivo@tinc-vpn.org>
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
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: graph.c,v 1.1.2.28 2003/08/22 11:18:42 guus Exp $
+ $Id$
*/
/* We need to generate two trees from the graph:
#include "netutl.h"
#include "node.h"
#include "process.h"
+#include "subnet.h"
#include "utils.h"
/* Implementation of Kruskal's algorithm.
/* Clear MST status on connections */
for(node = connection_tree->head; node; node = node->next) {
- c = (connection_t *) node->data;
+ c = node->data;
c->status.mst = false;
}
/* Clear visited status on nodes */
for(node = node_tree->head; node; node = node->next) {
- n = (node_t *) node->data;
+ n = node->data;
n->status.visited = false;
nodes++;
}
for(skipped = false, node = edge_weight_tree->head; node; node = next) {
next = node->next;
- e = (edge_t *) node->data;
+ e = node->data;
if(!e->reverse || e->from->status.visited == e->to->status.visited) {
skipped = true;
void sssp_bfs(void)
{
- avl_node_t *node, *from, *next, *to;
+ avl_node_t *node, *next, *to;
edge_t *e;
node_t *n;
- avl_tree_t *todo_tree;
+ list_t *todo_list;
+ list_node_t *from, *todonext;
bool indirect;
char *name;
char *address, *port;
cp();
- todo_tree = avl_alloc_tree(NULL, NULL);
+ todo_list = list_alloc(NULL);
/* Clear visited status on nodes */
for(node = node_tree->head; node; node = node->next) {
- n = (node_t *) node->data;
+ n = node->data;
n->status.visited = false;
n->status.indirect = true;
}
myself->status.indirect = false;
myself->nexthop = myself;
myself->via = myself;
- node = avl_alloc_node();
- node->data = myself;
- avl_insert_top(todo_tree, node);
+ list_insert_head(todo_list, myself);
- /* Loop while todo_tree is filled */
+ /* Loop while todo_list is filled */
- while(todo_tree->head) {
- for(from = todo_tree->head; from; from = next) { /* "from" is the node from which we start */
- next = from->next;
- n = (node_t *) from->data;
+ for(from = todo_list->head; from; from = todonext) { /* "from" is the node from which we start */
+ n = from->data;
- for(to = n->edge_tree->head; to; to = to->next) { /* "to" is the edge connected to "from" */
- e = (edge_t *) to->data;
+ for(to = n->edge_tree->head; to; to = to->next) { /* "to" is the edge connected to "from" */
+ e = to->data;
- if(!e->reverse)
- continue;
+ if(!e->reverse)
+ continue;
- /* Situation:
+ /* Situation:
- /
/
- ------(n)-----(e->to)
+ /
+ ----->(n)---e-->(e->to)
+ \
\
- \
-
- n->address is set to the e->address of the edge left of n to n.
- We are currently examining the edge e right of n from n:
-
- - If e->reverse->address != n->address, then e->to is probably
- not reachable for the nodes left of n. We do as if the indirectdata
- flag is set on edge e.
- - If edge e provides for better reachability of e->to, update
- e->to and (re)add it to the todo_tree to (re)examine the reachability
- of nodes behind it.
- */
-
- indirect = n->status.indirect || e->options & OPTION_INDIRECT
- || ((n != myself) && sockaddrcmp(&n->address, &e->reverse->address));
-
- if(e->to->status.visited
- && (!e->to->status.indirect || indirect))
- continue;
-
- e->to->status.visited = true;
- e->to->status.indirect = indirect;
- e->to->nexthop = (n->nexthop == myself) ? e->to : n->nexthop;
- e->to->via = indirect ? n->via : e->to;
- e->to->options = e->options;
-
- if(sockaddrcmp(&e->to->address, &e->address)) {
- node = avl_unlink(node_udp_tree, e->to);
- sockaddrfree(&e->to->address);
- sockaddrcpy(&e->to->address, &e->address);
-
- if(e->to->hostname)
- free(e->to->hostname);
-
- e->to->hostname = sockaddr2hostname(&e->to->address);
- avl_insert_node(node_udp_tree, node);
- }
- node = avl_alloc_node();
- node->data = e->to;
- avl_insert_before(todo_tree, from, node);
+ 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.
+ We are currently examining the edge e right of n from n:
+
+ - If e->reverse->address != n->address, then e->to is probably
+ not reachable for the nodes left of n. We do as if the indirectdata
+ flag is set on edge e.
+ - If edge e provides for better reachability of e->to, update
+ e->to and (re)add it to the todo_list to (re)examine the reachability
+ of nodes behind it.
+ */
+
+ indirect = n->status.indirect || e->options & OPTION_INDIRECT
+ || ((n != myself) && sockaddrcmp(&n->address, &e->reverse->address));
+
+ if(e->to->status.visited
+ && (!e->to->status.indirect || indirect))
+ continue;
+
+ e->to->status.visited = true;
+ e->to->status.indirect = indirect;
+ e->to->nexthop = (n->nexthop == myself) ? e->to : n->nexthop;
+ e->to->via = indirect ? n->via : e->to;
+ e->to->options = e->options;
+
+ if(sockaddrcmp(&e->to->address, &e->address)) {
+ node = avl_unlink(node_udp_tree, e->to);
+ sockaddrfree(&e->to->address);
+ sockaddrcpy(&e->to->address, &e->address);
+
+ if(e->to->hostname)
+ free(e->to->hostname);
+
+ e->to->hostname = sockaddr2hostname(&e->to->address);
+ avl_insert_node(node_udp_tree, node);
+
+ if(e->to->options & OPTION_PMTU_DISCOVERY) {
+ e->to->mtuprobes = 0;
+ e->to->minmtu = 0;
+ e->to->maxmtu = MTU;
+ if(e->to->status.validkey)
+ send_mtu_probe(e->to);
+ }
}
- avl_delete_node(todo_tree, from);
+ list_insert_tail(todo_list, e->to);
}
+
+ todonext = from->next;
+ list_delete_node(todo_list, from);
}
- avl_free_tree(todo_tree);
+ list_free(todo_list);
/* Check reachability status. */
for(node = node_tree->head; node; node = next) {
next = node->next;
- n = (node_t *) node->data;
+ n = node->data;
if(n->status.visited != n->status.reachable) {
n->status.reachable = !n->status.reachable;
if(n->status.reachable) {
ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Node %s (%s) became reachable"),
n->name, n->hostname);
+ avl_insert(node_udp_tree, n);
} else {
ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Node %s (%s) became unreachable"),
n->name, n->hostname);
+ avl_delete(node_udp_tree, n);
}
n->status.validkey = false;
n->status.waitingforkey = false;
+ n->maxmtu = MTU;
+ n->minmtu = 0;
+ n->mtuprobes = 0;
+
asprintf(&envp[0], "NETNAME=%s", netname ? : "");
asprintf(&envp[1], "DEVICE=%s", device ? : "");
asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
free(address);
free(port);
- for(i = 0; i < 7; i++)
+ for(i = 0; i < 6; i++)
free(envp[i]);
+
+ subnet_update(n, NULL, n->status.reachable);
}
}
}
projects / tinc / blobdiff