This appears to be because if you use a RAW socket with IPPROTO_RAW the
ipv6 stack passes it straight through and the skb transport_header,
network_header offset are not set.
Putting the following at the top of compress_udp_header fixes the
problem but I am not sure it is safe.
if (skb->transport_header == skb->network_header){
skb_set_transport_header(skb,sizeof(struct ipv6hdr));
}
Simon
-
On 30/10/14 09:42, Simon Vincent wrote:
I think I have stumbled across a bug in the udp header compression or
possibly in a higher layer of the network stack.
If I send a UDP message using a RAW socket[0] the src and dest port
numbers get corrupted on 802.15.4 devices. This does not occur on
ethernet.
If I print out the udp source and destination ports in
compress_udp_header they are incorrect. The function udp_hdr is not
pointing at the udp header but actually the ip6 header.
If I send a UDP message using a normal UDP socket I do not have this
problem.
Any ideas?
Simon
[0] - socket(AF_INET6, SOCK_RAW, IPPROTO_RAW);
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