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add pktinfo stuff

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This commit is contained in:
christos 2013-06-27 20:14:25 +00:00
parent 9dc2582e68
commit 0234645c61
1 changed files with 28 additions and 2 deletions
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30
share/man/man4/ip.4
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@ -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 @@ setsockopt(s, IPPROTO_IP, IP_IPSEC_POLICY, buf, ipsec_get_policylen(buf));
.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_level = IPPROTO_IP
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