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[src/trunk]: src/share/man/man4 add pktinfo stuff
details: https://anonhg.NetBSD.org/src/rev/f71b3868b91b
branches: trunk
changeset: 787654:f71b3868b91b
user: christos <christos%NetBSD.org@localhost>
date: Thu Jun 27 20:14:25 2013 +0000
description:
add pktinfo stuff
diffstat:
share/man/man4/ip.4 | 30 ++++++++++++++++++++++++++++--
1 files changed, 28 insertions(+), 2 deletions(-)
diffs (58 lines):
diff -r 69517569a224 -r f71b3868b91b share/man/man4/ip.4
--- a/share/man/man4/ip.4 Thu Jun 27 20:03:36 2013 +0000
+++ b/share/man/man4/ip.4 Thu Jun 27 20:14:25 2013 +0000
@@ -1,4 +1,4 @@
-.\" $NetBSD: ip.4,v 1.33 2012/06/25 14:47:55 christos Exp $
+.\" $NetBSD: ip.4,v 1.34 2013/06/27 20:14:25 christos Exp $
.\"
.\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
@@ -29,7 +29,7 @@
.\"
.\" @(#)ip.4 8.2 (Berkeley) 11/30/93
.\"
-.Dd June 25, 2012
+.Dd June 27, 2013
.Dt IP 4
.Os
.Sh NAME
@@ -111,6 +111,25 @@
.Ed
.Pp
The
+.Dv IP_PKTINFO
+option can be used to turn on receiving of information about the source
+address of the packet, and the interface index. The information is passed
+in an
+.Tp struct in_pktinfo
+structure, which contains
+.Bd -literal
+ struct in_addr ipi_addr; /* the source or destination address */
+ unsigned int ipi_ifindex; /* the interface index */
+.Ed
+and added to the control portion of the message:
+The cmsghdr fields have the following values:
+.Bd -literal
+cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo))
+cmsg_level = IPPROTO_IP
+cmsg_type = IP_PKTINFO
+.Ed
+.Pp
+The
.Dv IP_PORTALGO
can be used to randomize the port selection.
Valid algorithms are described in
@@ -189,6 +208,13 @@
cmsg_type = IP_RECVIF
.Ed
.Pp
+The
+.Dv IP_RECVPKTINFO
+option is similar to the
+.Dv IP_PKTINFO
+one, only in this case the inbound information is returned.
+i
+.Pp
If the
.Dv IP_RECVTTL
option is enabled on a
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