ip_gre: fix ipgre_header to return correct offset
authorTimo Teräs <timo.teras@iki.fi>
Tue, 6 Aug 2013 10:45:43 +0000 (13:45 +0300)
committerDavid S. Miller <davem@davemloft.net>
Fri, 9 Aug 2013 18:05:24 +0000 (11:05 -0700)
commit77a482bdb2e68d13fae87541b341905ba70d572b
treeba85e09ee08b8ae06c402fa08a0e1563de9d76a0
parent75848d338cdecec206018e8b49fe081c624c200d
ip_gre: fix ipgre_header to return correct offset

Fix ipgre_header() (header_ops->create) to return the correct
amount of bytes pushed. Most callers of dev_hard_header() seem
to care only if it was success, but af_packet.c uses it as
offset to the skb to copy from userspace only once. In practice
this fixes packet socket sendto()/sendmsg() to gre tunnels.

Regression introduced in c54419321455631079c7d6e60bc732dd0c5914c5
("GRE: Refactor GRE tunneling code.")

Cc: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Timo Teräs <timo.teras@iki.fi>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/ip_gre.c