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[DCCP]: Increment sequence numbers on retransmitted Response packets 

Problem:
This commit is contained in:
Gerrit Renker 2006-11-13 13:12:07 -02:00 committed by David S. Miller
parent 08a29e41bb
commit e11d9d3080
2 changed files with 13 additions and 7 deletions
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16
net/dccp/minisocks.c
View File

@ -196,15 +196,17 @@ struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
/* Check for retransmitted REQUEST */
if (dccp_hdr(skb)->dccph_type == DCCP_PKT_REQUEST) {
if (after48(DCCP_SKB_CB(skb)->dccpd_seq,
dccp_rsk(req)->dreq_isr)) {
struct dccp_request_sock *dreq = dccp_rsk(req);
struct dccp_request_sock *dreq = dccp_rsk(req);
if (after48(DCCP_SKB_CB(skb)->dccpd_seq, dreq->dreq_isr)) {
dccp_pr_debug("Retransmitted REQUEST\n");
/* Send another RESPONSE packet */
dccp_set_seqno(&dreq->dreq_iss, dreq->dreq_iss + 1);
dccp_set_seqno(&dreq->dreq_isr,
DCCP_SKB_CB(skb)->dccpd_seq);
dreq->dreq_isr = DCCP_SKB_CB(skb)->dccpd_seq;
/*
* Send another RESPONSE packet
* To protect against Request floods, increment retrans
* counter (backoff, monitored by dccp_response_timer).
*/
req->retrans++;
req->rsk_ops->rtx_syn_ack(sk, req, NULL);
}
/* Network Duplicate, discard packet */

4
net/dccp/output.c
View File

@ -332,6 +332,8 @@ struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst,
skb->dst = dst_clone(dst);
dreq = dccp_rsk(req);
if (inet_rsk(req)->acked) /* increase ISS upon retransmission */
dccp_inc_seqno(&dreq->dreq_iss);
DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESPONSE;
DCCP_SKB_CB(skb)->dccpd_seq = dreq->dreq_iss;
@ -354,6 +356,8 @@ struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst,
dccp_csum_outgoing(skb);
/* We use `acked' to remember that a Response was already sent. */
inet_rsk(req)->acked = 1;
DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
return skb;
}