sk_filter_trim_cap (9) - Linux Manuals

sk_filter_trim_cap: run a packet through a socket filter

Command to display sk_filter_trim_cap manual in Linux: $ man 9 sk_filter_trim_cap

NAME

sk_filter_trim_cap - run a packet through a socket filter

SYNOPSIS

int sk_filter_trim_cap(struct sock * sk, struct sk_buff * skb, unsigned int cap);

ARGUMENTS

: sock associated with sk_buff

skb

: buffer to filter

cap

: limit on how short the eBPF program may trim the packet

DESCRIPTION

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.