'\" t
.\"     Title: sk_filter_trim_cap
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: June 2017
.\"    Manual: Linux Networking
.\"    Source: Kernel Hackers Manual 4.11.3
.\"  Language: English
.\"
.TH "SK_FILTER_TRIM_CAP" "9" "June 2017" "Kernel Hackers Manual 4\&.11\&" "Linux Networking"
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.SH "NAME"
sk_filter_trim_cap \- run a packet through a socket filter
.SH "SYNOPSIS"
.HP \w'int\ sk_filter_trim_cap('u
.BI "int sk_filter_trim_cap(struct\ sock\ *\ " "sk" ", struct\ sk_buff\ *\ " "skb" ", unsigned\ int\ " "cap" ");"
.SH "ARGUMENTS"
.PP
\fIstruct sock * sk\fR
.RS 4
sock associated with &sk_buff
.RE
.PP
\fIstruct sk_buff * skb\fR
.RS 4
buffer to filter
.RE
.PP
\fIunsigned int cap\fR
.RS 4
limit on how short the eBPF program may trim the packet
.RE
.SH "DESCRIPTION"
.PP
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\&.
.SH "COPYRIGHT"
.br