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Subject: [Bug 198868] pf brakes tcp checksum if enabled for ue adapter
Date: Tue, 24 Mar 2015 13:42:53 +0000
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X-Bugzilla-Component: kern
X-Bugzilla-Version: 10.1-STABLE
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X-Bugzilla-Severity: Affects Only Me
X-Bugzilla-Who: dms@samersoff.net
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198868

            Bug ID: 198868
           Summary: pf brakes tcp checksum if enabled for ue adapter
           Product: Base System
           Version: 10.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: dms@samersoff.net

When pf is enabled on ue0 interface, tcp connection to this interface is not
possible. tcpdump shows incorrect tcp checksum

dmseg:

axe0: <vendor 0x0b95 product 0x7e2b, rev 2.00/0.01, addr 2> on usbus3
miibus1: <MII bus> on axe0
ukphy0: <Generic IEEE 802.3u media interface> PHY 16 on miibus1
ukphy0:  none, 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto, auto-flow
ue0: <USB Ethernet> on axe0
ue0: Ethernet address: 9c:eb:e8:06:c4:a7

pf.conf:

pass log quick on lo0
pass log quick on ue0


tcpdump output:

16:42:03.742071 IP (tos 0x0, ttl 64, id 759, offset 0, flags [DF], proto TCP
(6), length 52)
    192.168.0.85.ssh > 192.168.0.77.57379: Flags [F.], cksum 0x8219 (incorrect
-> 0x3432), seq 2656523414, ack 3256801674, win 1040, options [nop,nop,TS val
2997057078 ecr 124263796], length 0

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