Hi,
I'm trying to hack together something which will run through the retransmit
queue looking at the tcp headers.
However, tcp_hdr() seems not to be returning anything useful. Am I being
very naïve here expecting to be able to read the tcp header in this way or
have I made some other silly mistake? The brief snippet below gets nowhere
as (*th) seems undefined, although (*scb) apparently is. I'm calling the
function at the start of tcp_clean_rtx_queue().
Any enlightment welcomed.
Thanks,
Gavin
static void walk_rtx_queue(struct sock *sk)
{
struct tcp_sock *tp = tcp_sk(sk);
struct sk_buff *skb;
tcp_for_write_queue(skb, sk) {
struct tcp_skb_cb *scb = TCP_SKB_CB(skb);
struct tcphdr *th = tcp_hdr(skb);
if(th)
printk(KERN_ERR "src: %u dest:
%u\n",ntohs(th->source),ntohs(th->dest));
}
}
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