udp6: fix UDP/IPv6 encap resubmit path

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[ Upstream commit 59dca1d8a6 ]

IPv4 interprets a negative return value from a protocol handler as a
request to redispatch to a new protocol.  In contrast, IPv6 interprets a
negative value as an error, and interprets a positive value as a request
for redispatch.

UDP for IPv6 was unaware of this difference.  Change __udp6_lib_rcv() to
return a positive value for redispatch.  Note that the socket's
encap_rcv hook still needs to return a negative value to request
dispatch, and in the case of IPv6 packets, adjust IP6CB(skb)->nhoff to
identify the byte containing the next protocol.

Signed-off-by: Bill Sommerfeld <wsommerfeld@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Bill Sommerfeld 2016-03-04 14:47:21 -08:00 • committed by Greg Kroah-Hartman

parent 2d11623bd0

commit 8a2226c17e

1 changed files with 2 additions and 4 deletions

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net/ipv6/udp.c

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