Provided by:
linux-doc-2.6.15_2.6.15-23.39_all 
NAME
sk_run_filter - run a filter on a socket
SYNOPSIS
int sk_run_filter (struct sk_buff * skb, struct sock_filter * filter,
int flen);
ARGUMENTS
skb buffer to run the filter on
filter filter to apply
flen length of filter
DESCRIPTION
Decode and apply filter instructions to the skb->data. Return length to
keep, 0 for none. skb is the data we are filtering, filter is the array
of filter instructions, and len is the number of filter blocks in the
array.