sk_filter_trim_cap9

Run a packet through a socket filter

Arguments

sock associated with sk_buff

skb

buffer to filter

cap

limit on how short the eBPF program may trim the packet

Overview

Run the eBPF program and then cut skb->data to correct size returned by the program. 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 BPF_PROG_RUN. It returns 0 if the packet should be accepted or -EPERM if the packet should be tossed.

History

Debian 9 (Stretch): the text shown here
Debian 8 (Jessie)