On Mon, Aug 22, 2016 at 2:31 PM, Eric Dumazet <eric.duma...@gmail.com> wrote: > From: Eric Dumazet <eduma...@google.com> > > When sending an ack in SYN_RECV state, we must scale the offered > window if wscale option was negotiated and accepted. > > Tested: > Following packetdrill test demonstrates the issue : > > 0.000 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 > +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 > > +0 bind(3, ..., ...) = 0 > +0 listen(3, 1) = 0 > > // Establish a connection. > +0 < S 0:0(0) win 20000 <mss 1000,sackOK,wscale 7, nop, TS val 100 ecr 0> > +0 > S. 0:0(0) ack 1 win 28960 <mss 1460,sackOK, TS val 100 ecr 100, nop, > wscale 7> > > +0 < . 1:11(10) ack 1 win 156 <nop,nop,TS val 99 ecr 100> > // check that window is properly scaled ! > +0 > . 1:1(0) ack 1 win 226 <nop,nop,TS val 200 ecr 100> > > > Signed-off-by: Eric Dumazet <eduma...@google.com> > Cc: Yuchung Cheng <ych...@google.com> > Cc: Neal Cardwell <ncardw...@google.com> > ---
Acked-by: Neal Cardwell <ncardw...@google.com> Nice. neal
