pcap_set_protocol_linux(3pcap) — Linux manual page



NAME         top

       pcap_set_protocol_linux  -  set  capture protocol for a not-yet-acti‐
       vated capture handle

SYNOPSIS         top

       #include <pcap/pcap.h>

       int pcap_set_protocol_linux(pcap_t *p, int protocol);

DESCRIPTION         top

       On network interface devices on Linux, pcap_set_protocol_linux() sets
       the protocol to be used in the socket(2) call to create a capture
       socket when the handle is activated.  The argument is a link-layer
       protocol value, such as the values in the <linux/if_ether.h> header
       file, specified in host byte order.  If protocol is non-zero, packets
       of that protocol will be captured when the handle is activated,
       otherwise, all packets will be captured.  This function is only
       provided on Linux, and, if it is used on any device other than a
       network interface, it will have no effect.

       It should not be used in portable code; instead, a filter should be
       specified with pcap_setfilter(3PCAP).

       If a given network interface provides a standard link-layer header,
       with a standard packet type, but provides some packet types with a
       different socket-layer protocol type from the one in the link-layer
       header, that packet type cannot be filtered with a filter specified
       with pcap_setfilter() but can be filtered by specifying the socket-
       layer protocol type using pcap_set_protocol_linux().

RETURN VALUE         top

       pcap_set_protocol_linux() returns 0 on success or
       PCAP_ERROR_ACTIVATED if called on a capture handle that has been


       This function became available in libpcap release 1.9.0.

SEE ALSO         top

       pcap(3PCAP), pcap_create(3PCAP), pcap_activate(3PCAP)

COLOPHON         top

       This page is part of the libpcap (packet capture library) project.
       Information about the project can be found at 
       ⟨http://www.tcpdump.org/⟩.  If you have a bug report for this manual
       page, see ⟨http://www.tcpdump.org/#patches⟩.  This page was obtained
       from the project's upstream Git repository
       ⟨https://github.com/the-tcpdump-group/libpcap.git⟩ on 2020-07-14.
       (At that time, the date of the most recent commit that was found in
       the repository was 2020-07-04.)  If you discover any rendering prob‐
       lems in this HTML version of the page, or you believe there is a bet‐
       ter or more up-to-date source for the page, or you have corrections
       or improvements to the information in this COLOPHON (which is not
       part of the original manual page), send a mail to man-pages@man7.org

                               22 August 2018 PCAP_SET_PROTOCOL_LINUX(3PCAP)