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>

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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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1

include/linux/if_packet.h

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29

net/packet/af_packet.c

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