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[DCCP]: Initial feature negotiation implementation

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Still needs more work, but boots and doesn't crashes, even
does some negotiation!

18:38:52.174934  127.0.0.1.43458 > 127.0.0.1.5001: request <change_l ack_ratio 2, change_r ccid 2, change_l ccid 2>
18:38:52.218526  127.0.0.1.5001 > 127.0.0.1.43458: response <nop, nop, change_l ack_ratio 2, confirm_r ccid 2 2, confirm_l ccid 2 2, confirm_r ack_ratio 2>
18:38:52.185398  127.0.0.1.43458 > 127.0.0.1.5001: <nop, confirm_r ack_ratio 2, ack_vector0 0x00, elapsed_time 212>

:-)

Signed-off-by: Andrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrea Bittau
2006-03-20 17:43:56 -08:00
committed by David S. Miller
parent 2a91aa3967
commit afe00251dd
11 changed files with 847 additions and 6 deletions
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12
net/dccp/timer.c
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@@ -141,6 +141,17 @@ static void dccp_retransmit_timer(struct sock *sk)
{
struct inet_connection_sock *icsk = inet_csk(sk);
/* retransmit timer is used for feature negotiation throughout
* connection. In this case, no packet is re-transmitted, but rather an
* ack is generated and pending changes are splaced into its options.
*/
if (sk->sk_send_head == NULL) {
dccp_pr_debug("feat negotiation retransmit timeout %p\n", sk);
if (sk->sk_state == DCCP_OPEN)
dccp_send_ack(sk);
goto backoff;
}
/*
* sk->sk_send_head has to have one skb with
* DCCP_SKB_CB(skb)->dccpd_type set to one of the retransmittable DCCP
@@ -177,6 +188,7 @@ static void dccp_retransmit_timer(struct sock *sk)
goto out;
}
backoff:
icsk->icsk_backoff++;
icsk->icsk_retransmits++;