Module Name: src Committed By: martin Date: Thu Nov 14 15:34:35 UTC 2019
Modified Files: src/sys/net [netbsd-9]: if_loop.c Log Message: Pull up following revision(s) (requested by msaitoh in ticket #424): sys/net/if_loop.c: revision 1.108 sys/net/if_loop.c: revision 1.109 Fix IP broadcast + checksum offload problem. When a machine sends a IP broadcast packet to an Ethernet interface that the checksum offload flags are set, the packet goes through ether_output() -> looutput() and the offload flags is cleared without calculating the checksum. And then, ip_input() calculate the packet's checksum because it's csum_flags is zero. It regard as bad checksum and it's dropped because the packet's ifp is s not lo0's. Fixes this bug by passing csum_flags as "calculated and good" when IN_LOOPBACK_NEED_CHECKSUM() is false. Advised by ryo@. This problem was seen when "routed -s" was used and the machine's interface's offload flags were set. bad checksum field of "netstat -s" was increased every 30 seconds. Fix comment. To generate a diff of this commit: cvs rdiff -u -r1.107 -r1.107.2.1 src/sys/net/if_loop.c Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.