Re: problems with udp header compression

[Simon Vincent <simon.vincent@xsilon.com>]

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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