SCTP: drop SACK if ctsn is not less than the next tsn of assoc

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We need to drop the SACK if the peer is attempting to acknowledge
unset data, i.e.  the CTSN in the SACK is greater or equal to the
next TSN we will send.

Example:
Endpoint A                                      Endpoint B
                             <---------------   DATA (TSN=1)
SACK(TSN=1) ---------------> 
                             <---------------   DATA (TSN=2)
                             <---------------   DATA (TSN=3)
                             <---------------   DATA (TSN=4)
                             <---------------   DATA (TSN=5)
SACK(TSN=1000) --------------->
                             <---------------   DATA (TSN=6)
                             <---------------   DATA (TSN=7)

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>

...

This commit is contained in:

Wei Yongjun 2007-08-02 16:57:44 +08:00 • committed by Vlad Yasevich

parent e4d1feab5d

commit aecedeab6f

1 changed files with 78 additions and 25 deletions

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103

net/sctp/sm_statefuns.c

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