Provided by: linux-doc-2.6.15_2.6.15-23.39_all
sk_filter - run a packet through a socket filter
int sk_filter (struct sock * sk, struct sk_buff * skb, int needlock);
sk sock associated with &sk_buff
skb buffer to filter
set to 1 if the sock is not locked by caller.
Run the filter code and then cut skb->data to correct size returned by
sk_run_filter. If pkt_len is 0 we toss packet. If skb->len is smaller
than pkt_len we keep whole skb->data. This is the socket level wrapper
to sk_run_filter. It returns 0 if the packet should be accepted or
-EPERM if the packet should be tossed.