Date: Sat, 29 Sep 2018 07:36:14 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 231797] hn driver drops UDP traffic with EIO error when TXCSUM_IPV6 flag on Message-ID: <bug-231797-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231797 Bug ID: 231797 Summary: hn driver drops UDP traffic with EIO error when TXCSUM_IPV6 flag on Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: dslr.rfmGJfQJmFc9Qt9a@gmail.com In https://reviews.freebsd.org/D12417, if_hn.c is changed at lines 5590 and 5886, which should allow UDPv6 packets to enter hn_set_hlen at line 780. However, at line 813, traffic not matching TCPv6 (UDPv6) would error. Thusly, it seems when IPv6 transmit checksum offloading is on, UDPv6 traffic is dropped in the hn driver. I first noticed this in practice with dhcp6c, where the first UDPv6 solicit would fail with the error, transmit failed: Input/output error due to the kernel returning EIO for the UDPv6 packet. As expected, the output error count rises correspondingly, with no kernel output messages in the syslogs. I was able to determine that disabling TXCSUM_IPV6 via, ifconfig hn0 -txcsum6 Stops the EIO from propogating from the driver, which led me to this area in the source. -- You are receiving this mail because: You are the assignee for the bug.
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