Date: Mon, 23 May 2022 21:47:21 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 264193] Broken scrub max-mss Message-ID: <bug-264193-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D264193 Bug ID: 264193 Summary: Broken scrub max-mss Product: Base System Version: 13.1-RELEASE Hardware: amd64 OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: oleg@mamontov.net I use pf scrub feature for adjusting TCP MSS on policy routed via wireguard tunnel SMTP traffic: # pfctl -sr | grep scrub scrub on wg-ep proto tcp all max-mss 1380 fragment reassemble The rule suddenly stopped working after upgrading from 13.0-RELEASE-p11 to 13.1-RELEASE. Below is the result on 13.0 (works as expected): 12:10:48.016196 IP 212.109.198.23.465 > 192.168.24.44.56695: Flags [S.], seq 687795294, ack 3030165102, win 65535, options [mss 1380,nop,wscale 6,sackOK= ,TS val 4107107091 ecr 1376219825], length 0 But 13.1 shows that MSS remains intact (default for ethernet with mtu 1500): 11:52:23.910283 IP 212.109.198.23.465 > 192.168.24.44.55961: Flags [S.], seq 3877530257, ack 3326182804, win 65535, options [mss 1460,nop,wscale 6,sackO= K,TS val 2918817557 ecr 1485323373], length 0 However, matching counter is still increasing: # pfctl -vvsr | grep -A1 scrub @0 scrub on wg-ep proto tcp all max-mss 1380 fragment reassemble [ Evaluations: 1370 Packets: 38 Bytes: 1543 States: 0= =20=20=20=20 ] Downgrading to 13.0 fixes the behaviour again. --=20 You are receiving this mail because: You are the assignee for the bug.=
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