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packet: add PACKET_RESERVE sockopt

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Add new sockopt to reserve some headroom in the mmaped ring frames in
front of the packet payload. This can be used f.i. when the VLAN header
needs to be (re)constructed to avoid moving the entire payload.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy
2008-07-18 18:05:19 -07:00
committed by David S. Miller
parent 3ca4095f24
commit 8913336a7e
2 changed files with 27 additions and 3 deletions
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include/linux/if_packet.h
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@@ -45,6 +45,7 @@ struct sockaddr_ll
#define PACKET_ORIGDEV 9
#define PACKET_VERSION 10
#define PACKET_HDRLEN 11
#define PACKET_RESERVE 12
struct tpacket_stats
{