Make IPv4 multicast space 224.0.0.0/4 broadcast by default.

We already do this for IPv6 multicast space (ff00::/8), so why not
extend it to IPv4.

diff --git a/doc/tinc.conf.5.in b/doc/tinc.conf.5.in
index 9566afa..ad75fa9 100644 (file)
--- a/doc/tinc.conf.5.in
+++ b/doc/tinc.conf.5.in
@@ -161,7 +161,7 @@ This is most useful to declare subnet broadcast addresses (e.g. 10.42.255.255),
 .Nm tinc
 won't know what to do with them.
 .Pp
-Note that global broadcast addresses (MAC ff:ff:ff:ff:ff:ff, IPv4 255.255.255.255), as well as IPv6 multicast space (ff00::/8) are always considered broadcast addresses and don't need to be declared.
+Note that global broadcast addresses (MAC ff:ff:ff:ff:ff:ff, IPv4 255.255.255.255), as well as multicast space (IPv4 224.0.0.0/4, IPv6 ff00::/8) are always considered broadcast addresses and don't need to be declared.
 .It Va ConnectTo Li = Ar name
 Specifies which other tinc daemon to connect to on startup.
 Multiple

diff --git a/src/net_setup.c b/src/net_setup.c
index 0f8d31a..6d15fcf 100644 (file)
--- a/src/net_setup.c
+++ b/src/net_setup.c
@@ -586,7 +586,7 @@ bool setup_myself_reloadable(void) {
                free(bmode);
        }
 
-       const char* const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "ff00::/8" };
+       const char* const DEFAULT_BROADCAST_SUBNETS[] = { "ff:ff:ff:ff:ff:ff", "255.255.255.255", "224.0.0.0/4", "ff00::/8" };
        for (size_t i = 0; i < sizeof(DEFAULT_BROADCAST_SUBNETS) / sizeof(*DEFAULT_BROADCAST_SUBNETS); i++) {
                subnet_t *s = new_subnet();
                if (!str2net(s, DEFAULT_BROADCAST_SUBNETS[i]))