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Document the IP_RECVIF socket option. Also mention that IP_RECVDSTADDR

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works with SOCK_RAW sockets now, as well as SOCK_DGRAM.
This commit is contained in:
thorpej 1997-01-12 00:59:51 +00:00
parent 2773f282b9
commit a5f0d79aaa
1 changed files with 24 additions and 2 deletions
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26
share/man/man4/ip.4
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@ -1,4 +1,4 @@
.\" $NetBSD: ip.4,v 1.3 1994/11/30 16:22:19 jtc Exp $ .\" $NetBSD: ip.4,v 1.4 1997/01/12 00:59:51 thorpej Exp $
.\" .\"
.\" Copyright (c) 1983, 1991, 1993 .\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. All rights reserved. .\" The Regents of the University of California. All rights reserved.
@ -114,7 +114,9 @@ setsockopt(s, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl));
If the If the
.Dv IP_RECVDSTADDR .Dv IP_RECVDSTADDR
option is enabled on a option is enabled on a
.Dv SOCK_DGRAM .Dv SOCK_DGRAM
or
.Dv SOCK_RAW
socket, socket,
the the
.Xr recvmsg .Xr recvmsg
@ -133,6 +135,26 @@ cmsg_len = sizeof(struct in_addr)
cmsg_level = IPPROTO_IP cmsg_level = IPPROTO_IP
cmsg_type = IP_RECVDSTADDR cmsg_type = IP_RECVDSTADDR
.Ed .Ed
.Pp
If the
.Dv IP_RECVIF
option is enabled on a
.Dv SOCK_DGRAM
or
.Dv SOCK_RAW
socket,
the
.Xr recvmsg
call will return a struct sockaddr_dl corresponding to
the interface on which the packet was received.
the msg_control field in the msghdr structure points to a buffer
that contains a cmsghdr structure followed by the struct sockaddr_dl.
The cmsghdr fields have the following values:
.Bd -literal
cmsg_len = sizeof(struct sockaddr_dl)
cmsg_level = IPPROTO_IP
cmsg_type = IP_RECVIF
.Ed
.Ss "Multicast Options" .Ss "Multicast Options"
.Pp .Pp
.Tn IP .Tn IP