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Make broadcast addresses configurable.

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This adds a new option, BroadcastSubnet, that allows the user to
declare broadcast subnets, i.e. subnets which are considered broadcast
addresses by the tinc routing layer. Previously only the global IPv4
and IPv6 broadcast addresses were supported by virtue of being
hardcoded.

This is useful when using tinc in router mode with Ethernet virtual
devices, as it can be used to provide broadcast support for a local
broadcast address (e.g. 10.42.255.255) instead of just the global
address (255.255.255.255).

This is implemented by removing hardcoded broadcast addresses and
introducing "broadcast subnets", which are subnets with a NULL owner.
By default, behavior is unchanged; this is accomplished by adding
the global broadcast addresses for Ethernet, IPv4 and IPv6 at start
time.
This commit is contained in:
Etienne Dechamps 2014-06-29 13:18:25 +01:00
parent b54fde6747
commit 46a5aa0d67
5 changed files with 58 additions and 38 deletions
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5
src/net.c
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@ -347,11 +347,14 @@ int reload_configuration(void) {
if(strictsubnets) {
for splay_each(subnet_t, subnet, subnet_tree)
subnet->expires = 1;
if (subnet->owner)
subnet->expires = 1;
load_all_subnets();
for splay_each(subnet_t, subnet, subnet_tree) {
if (!subnet->owner)
continue;
if(subnet->expires == 1) {
send_del_subnet(everyone, subnet);
if(subnet->owner->status.reachable)