tree 2835792fcc7e553c943069c6696d0ecae3243db5
parent 43e575023f1acb71dcf02ce5e67ca4451fff3cdd
author Paolo Abeni <pabeni@redhat.com> 1536848840 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1538215653 -0700

udp4: fix IP_CMSG_CHECKSUM for connected sockets

[ Upstream commit 2b5a921740a55c00223a797d075b9c77c42cb171 ]

commit 2abb7cdc0dc8 ("udp: Add support for doing checksum
unnecessary conversion") left out the early demux path for
connected sockets. As a result IP_CMSG_CHECKSUM gives wrong
values for such socket when GRO is not enabled/available.

This change addresses the issue by moving the csum conversion to a
common helper and using such helper in both the default and the
early demux rx path.

Fixes: 2abb7cdc0dc8 ("udp: Add support for doing checksum unnecessary conversion")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>