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l2tp: add peer_offset parameter

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Introduce peer_offset parameter in order to add the capability
to specify two different values for payload offset on tx/rx side.
If just offset is provided by userspace use it for rx side as well
in order to maintain compatibility with older l2tp versions

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lorenzo Bianconi 2017-12-22 15:10:18 +01:00 • committed by David S. Miller
parent 820da53575
commit f15bc54eee
5 changed files with 38 additions and 8 deletions
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include/uapi/linux/l2tp.h
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@ -127,6 +127,7 @@ enum {
L2TP_ATTR_UDP_ZERO_CSUM6_TX, /* flag */
L2TP_ATTR_UDP_ZERO_CSUM6_RX, /* flag */
L2TP_ATTR_PAD,
L2TP_ATTR_PEER_OFFSET, /* u16 */
__L2TP_ATTR_MAX,
};