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pcap_set_protocol_linux(3pcap) — Linux manual page

PCAP_SET_PROTOCOL_LINUX(3PCAP)PCAP_SET_PROTOCOL_LINUX(3PCAP)

NAME        top

       pcap_set_protocol_linux - set capture protocol for a not-yet-       activated 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 thesocket(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.  Ifprotocol 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 withpcap_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 withpcap_setfilter() but can be filtered by       specifying the socket-layer protocol type usingpcap_set_protocol_linux().

RETURN VALUE        top

pcap_set_protocol_linux() returns0on success orPCAP_ERROR_ACTIVATEDif called on a capture handle that has been       activated.

BACKWARD COMPATIBILITY        top

       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 thelibpcap (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 2025-08-11.       (At that time, the date of the most recent commit that was found       in the repository was 2025-08-10.)  If you discover any rendering       problems in this HTML version of the page, or you believe there is       a better or more up-to-date source for the page, or you have       corrections or improvements to the information in this COLOPHON       (which isnot part of the original manual page), send a mail to       man-pages@man7.org                              22 August 2018PCAP_SET_PROTOCOL_LINUX(3PCAP)

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