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| author | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2008-07-26 14:59:09 +0400 |
|---|---|---|
| committer | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2008-07-26 14:59:09 +0400 |
| commit | 59435444a13ed52d3444c5df26b73d3086bcd57b (patch) | |
| tree | 72846dbcb8c6c41e6d630bcb81297801dfe7fb16 /net/dccp/dccp.h | |
| parent | cdec7e50a4896c5197d5575d9ca635eea6825149 (diff) | |
| download | linux-59435444a13ed52d3444c5df26b73d3086bcd57b.tar.xz | |
dccp: Allow to distinguish original and retransmitted packets
This patch allows the sender to distinguish original and retransmitted packets,
which is in particular needed for the retransmission of DCCP-Requests:
* the first Request uses ISS (generated in net/dccp/ip*.c), and sets GSS = ISS;
* all retransmitted Requests use GSS' = GSS + 1, so that the n-th retransmitted
Request has sequence number ISS + n (mod 48).
To add generic support, the patch reorganises existing code so that:
* icsk_retransmits == 0 for the original packet and
* icsk_retransmits = n > 0 for the n-th retransmitted packet
at the time dccp_transmit_skb() is called, via dccp_retransmit_skb().
Thanks to Wei Yongjun for pointing this problem out.
Further changes:
----------------
* removed the `skb' argument from dccp_retransmit_skb(), since sk_send_head
is used for all retransmissions (the exception is client-Acks in PARTOPEN
state, but these do not use sk_send_head);
* since sk_send_head always contains the original skb (via dccp_entail()),
skb_cloned() never evaluated to true and thus pskb_copy() was never used.
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Diffstat (limited to 'net/dccp/dccp.h')
| -rw-r--r-- | net/dccp/dccp.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h index 743d85fcd651..1c2e3ec2eb57 100644 --- a/net/dccp/dccp.h +++ b/net/dccp/dccp.h @@ -226,7 +226,7 @@ static inline void dccp_csum_outgoing(struct sk_buff *skb) extern void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb); -extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb); +extern int dccp_retransmit_skb(struct sock *sk); extern void dccp_send_ack(struct sock *sk); extern void dccp_reqsk_send_ack(struct sk_buff *sk, struct request_sock *rsk); |