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socket: improve checks for multicast support

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This commit is contained in:
Steffen Vogel 2017-06-28 10:56:10 +02:00
parent 97127b44ca
commit 5f262ffc9a
1 changed files with 7 additions and 3 deletions
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10
lib/nodes/socket.c
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@ -172,9 +172,13 @@ int socket_start(struct node *n)
if (s->local.sa.sa_family != s->remote.sa.sa_family)
error("Address families of local and remote must match!");
if (s->layer != SOCKET_LAYER_IP && s->layer != SOCKET_LAYER_UDP) {
if (s->multicast.enabled)
error("Multicast is only supported for the IP / UDP layers");
if (s->multicast.enabled) {
if (s->local.sa.sa_family != AF_INET)
error("Multicast is only supported by IPv4 for node %s", node_name(n));
uint32_t addr = ntohl(s->multicast.mreq.imr_multiaddr.s_addr);
if ((addr >> 28) != 14)
error("Multicast group address of node %s must be within 224.0.0.0/4", node_name(n));
}
if (s->layer == SOCKET_LAYER_IP) {