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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2008-07-26 11:59:09 +0100
committerGerrit Renker <gerrit@erg.abdn.ac.uk>2008-07-26 11:59:09 +0100
commit59435444a13ed52d3444c5df26b73d3086bcd57b (patch)
tree72846dbcb8c6c41e6d630bcb81297801dfe7fb16 /net/can/Kconfig
parentcdec7e50a4896c5197d5575d9ca635eea6825149 (diff)
downloadop-kernel-dev-59435444a13ed52d3444c5df26b73d3086bcd57b.zip
op-kernel-dev-59435444a13ed52d3444c5df26b73d3086bcd57b.tar.gz
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/can/Kconfig')
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