tree 1408fa434f103890900f4552d2f1de81cf153aa3
parent 9f648a60d9775ef5c977e7669d1673a7a67bef33
author Mikio Hara <mikioh.public.networking@gmail.com> 1552854675 +0900
committer Mikio Hara <mikioh.public.networking@gmail.com> 1552945511 +0000

ipv4: work around FreeBSD 12 kernel running COMPAT_FREEBSD32

On FreeBSD 12 kernel running COMPAT_FREEBSD32, it looks like the system
call recvmsg always returns an incorrect​ length for the out-of-band
data. This change adjusts the length when it looks incorrect.

Fixes golang/go#30899.

Change-Id: Ibb0cbcf9b1f5f959279c20395916d47bd75d289c
Reviewed-on: https://go-review.googlesource.com/c/net/+/168077
Reviewed-by: Ian Lance Taylor <iant@golang.org>