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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | ERRORS | HISTORY | SEE ALSO | COLOPHON |
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IPPROTO_IP(2const) IPPROTO_IP(2const)
IPPROTO_IP - Linux IPv4 protocol socket options
Standard C library (libc, -lc)
#include <netinet/in.h> /* Definition of IP* constants */
#include <sys/socket.h>
int setsockopt(int sockfd, IPPROTO_IP, int opt,
const void val[size], size_t size);
int getsockopt(int sockfd, IPPROTO_IP, int opt,
void val[size], size_t size);
IP supports some protocol-specific socket options that can be set
with setsockopt(2) and read with getsockopt(2). The socket option
level for IP is IPPROTO_IP.
The following socket options are supported.
IP_ADD_MEMBERSHIP(2const)
IP_ADD_SOURCE_MEMBERSHIP(2const)
IP_BIND_ADDRESS_NO_PORT(2const)
IP_BLOCK_SOURCE(2const)
IP_DROP_MEMBERSHIP(2const)
IP_DROP_SOURCE_MEMBERSHIP(2const)
IP_FREEBIND(2const)
IP_HDRINCL(2const)
IP_LOCAL_PORT_RANGE(2const)
IP_MSFILTER(2const)
IP_MTU(2const)
IP_MTU_DISCOVER(2const)
IP_MULTICAST_ALL(2const)
IP_MULTICAST_IF(2const)
IP_MULTICAST_LOOP(2const)
IP_MULTICAST_TTL(2const)
IP_NODEFRAG(2const)
IP_OPTIONS(2const)
IP_PASSSEC(2const)
IP_PKTINFO(2const)
IP_RECVERR(2const)
IP_RECVOPTS(2const)
IP_RECVORIGDSTADDR(2const)
IP_RECVTOS(2const)
IP_RECVTTL(2const)
IP_RETOPTS(2const)
IP_ROUTER_ALERT(2const)
IP_TOS(2const)
IP_TRANSPARENT(2const)
IP_TTL(2const)
IP_UNBLOCK_SOURCE(2const)
See setsockopt(2). See ip(7).
ENOPROTOOPT
opt is invalid.
IPPROTO_IP
POSIX.1-2001.
setsockopt(2), ip(7)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.18.tar.gz
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⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2026-05-24. 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 is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.18 2026-01-05 IPPROTO_IP(2const)
Pages that refer to this page: IP_ADD_MEMBERSHIP(2const), IP_ADD_SOURCE_MEMBERSHIP(2const), IP_BIND_ADDRESS_NO_PORT(2const), IP_BLOCK_SOURCE(2const), IP_DROP_MEMBERSHIP(2const), IP_DROP_SOURCE_MEMBERSHIP(2const), IP_FREEBIND(2const), IP_HDRINCL(2const), IP_LOCAL_PORT_RANGE(2const), IP_MSFILTER(2const), IP_MTU(2const), IP_MTU_DISCOVER(2const), IP_MULTICAST_ALL(2const), IP_MULTICAST_IF(2const), IP_MULTICAST_LOOP(2const), IP_MULTICAST_TTL(2const), IP_NODEFRAG(2const), IP_OPTIONS(2const), IP_PASSSEC(2const), IP_PKTINFO(2const), IP_RECVERR(2const), IP_RECVOPTS(2const), IP_RECVORIGDSTADDR(2const), IP_RECVTOS(2const), IP_RECVTTL(2const), IP_RETOPTS(2const), IP_ROUTER_ALERT(2const), IP_TOS(2const), IP_TRANSPARENT(2const), IP_TTL(2const), IP_UNBLOCK_SOURCE(2const), ip(7)
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HTML rendering created 2026-05-24 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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