Date: Sat, 20 Nov 2004 04:46:54 +0100 From: Pawel Worach <pawel.worach@telia.com> To: freebsd-net@freebsd.org Subject: SACK (and PF) wierdness Message-ID: <419EBE2E.9080108@telia.com>
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This is a multi-part message in MIME format. --------------000702090106080709040109 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hi, I bumped into a wierd problem with SACK. Basically my setup is. 192.168.1.10 .-crossover 192.168.1.200 ftp server fxp0<->wireless ap<-> ~~~ <->laptop wireless ath0 I run ftp from the laptop to the server. This is what happens: ftp> get zero local: zero remote: zero 200 EPRT command successful. 150 Opening BINARY mode data connection for 'zero'. 476 KB 299.53 KB/s 426 Data connection: Operation not permitted. 487424 bytes received in 00:01 (299.49 KB/s) I started to look at tcpdump while this was happening and quickly noticed that the connection got dropped by PF when SACK kicked in. PF says:Nov 20 04:27:35 <kern.crit> darkstar kernel: pf: BAD state: TCP 192.168.1.10:20 192.168.1.10:20 192.168.1.200:50640 [lo=3604799807 high=3604800103 win=33304 mod ulator=0 wscale=1] [lo=4089843176 high=4089909784 win=33304 modulator=0 wscale=1 ] 4:4 FPA seq=3604799807 ack=4089843176 len=296 ackskew=0 pkts=2497:1693 dir=out ,fwd Nov 20 04:27:35 <kern.crit> darkstar kernel: pf: State failure on: 1 | Nov 20 04:27:40 <kern.crit> darkstar kernel: pf: BAD state: TCP 192.168.1.10:20 192.168.1.10:20 192.168.1.200:58378 [lo=1373010668 high=1373010980 win=33304 mod ulator=0 wscale=1] [lo=3742879382 high=3742945990 win=33304 modulator=0 wscale=1 ] 4:4 A seq=1373010668 ack=3742879382 len=1448 ackskew=0 pkts=1266:851 dir=out,f wd Nov 20 04:27:40 <kern.crit> darkstar kernel: pf: State failure on: 1 | Nov 20 04:27:40 <kern.crit> darkstar kernel: pf: BAD state: TCP 192.168.1.10:20 192.168.1.10:20 192.168.1.200:58378 [lo=1373010668 high=1373010980 win=33304 mod ulator=0 wscale=1] [lo=3742879382 high=3742945990 win=33304 modulator=0 wscale=1 ] 4:4 A seq=1373010668 ack=3742879382 len=1448 ackskew=0 pkts=1266:851 dir=out,f wd If I disable sack on the ftp server everything works fine. I can reproduce this problem 100%, I have never managed to transfer more than 3Mb via ftp when SACK is on, with it off I see no problems, 11Mbit wireless at ~650Kb/s Attached are three tcpdumps of the ftp data channel after a 'get /dev/zero'. (I picked out the smallest ones, dropped after about 400kb of zeros) related pf.conf rules, on ftp server: pass out log quick on fxp0 inet proto tcp from fxp0 to any flags S/SA keep state queue (bulk, fast) and on client: pass in log quick inet proto tcp from any port 20 to <firewall> port >= 1024 flags S/SA keep state Any ideas? More info? -- Pawel --------------000702090106080709040109--
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