Date: Thu, 07 Sep 2023 16:10:43 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 273618] [pf] Port redirects for packets received on loopback have bad checksums Message-ID: <bug-273618-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D273618 Bug ID: 273618 Summary: [pf] Port redirects for packets received on loopback have bad checksums Product: Base System Version: 13.2-STABLE Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: dfr@rabson.org Normally packets received on loopback bypass the tcp checksum calculation s= ince the packet is expected to not leave the host. The packet header is marked as having a good checksum in looutput() even though the th_csum field (for tcp packets) just contains the pseudo header partial sum. If the packet's destination address is re-written to an address which route= s it to some other host, the packet will be delivered with a bad checksum and discarded by the target's tcp stack. I can work around this with 'ifconfig = lo0 -txcsum' but it would be better if there was a way for pf to detect this situation and repair the checksum. --=20 You are receiving this mail because: You are the assignee for the bug.=
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