.\" Copyright, the authors of the Linux man-pages project
.\"
.\" SPDX-License-Identifier: Linux-man-pages-copyleft
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.TH IPV6_RECVPKTINFO 2const 2025-12-02 "Linux man-pages 6.17"
.SH NAME
IPV6_RECVPKTINFO
\-
set delivery of the IPV6_PKTINFO control message on incoming datagrams
.SH LIBRARY
Standard C library
.RI ( libc ,\~ \-lc )
.SH SYNOPSIS
.nf
.BR "#include <netinet/in.h>" "  /* Definition of " IP* " constants */"
.B #include <sys/socket.h>
.P
.BI int\~setsockopt(int\~ sockfd ,\~IPPROTO_IPV6,\~IPV6_RECVPKTINFO,
.BI "               const\~int\~*" enable ,\~sizeof(int));
.fi
.SH DESCRIPTION
Set delivery of the
.B IPV6_PKTINFO
control message on incoming datagrams.
Such control messages contain a
.IR "struct in6_pktinfo" ,
as per RFC 3542.
.P
Allowed only for
.B SOCK_DGRAM
or
.B SOCK_RAW
sockets.
.SH ERRORS
See
.BR IPPROTO_IPV6 (2const).
See
.BR setsockopt (2).
See
.BR ipv6 (7).
.SH HISTORY
Linux 2.6.14.
.SH SEE ALSO
.BR IPPROTO_IPV6 (2const),
.BR setsockopt (2),
.BR cmsg (3),
.BR ipv6 (7)