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drop_monitor: Allow truncation of dropped packets

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When sending dropped packets to user space it is not always necessary to
copy the entire packet as usually only the headers are of interest.

Allow user to specify the truncation length and add the original length
of the packet as additional metadata to the netlink message.

By default no truncation is performed.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2019-08-11 10:35:52 +03:00 • committed by David S. Miller
parent ca30707dee
commit 57986617a7
2 changed files with 21 additions and 0 deletions
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2
include/uapi/linux/net_dropmon.h
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@ -75,6 +75,8 @@ enum net_dm_attr {
NET_DM_ATTR_PROTO, /* u16 */
NET_DM_ATTR_PAYLOAD, /* binary */
NET_DM_ATTR_PAD,
NET_DM_ATTR_TRUNC_LEN, /* u32 */
NET_DM_ATTR_ORIG_LEN, /* u32 */
__NET_DM_ATTR_MAX,
NET_DM_ATTR_MAX = __NET_DM_ATTR_MAX - 1