diff options
| -rw-r--r-- | share/man/man4/ip.4 | 39 |
1 files changed, 37 insertions, 2 deletions
diff --git a/share/man/man4/ip.4 b/share/man/man4/ip.4 index d7c563c1005..dc32cf2ad3a 100644 --- a/share/man/man4/ip.4 +++ b/share/man/man4/ip.4 @@ -1,4 +1,4 @@ -.\" $OpenBSD: ip.4,v 1.29 2011/02/03 16:08:24 otto Exp $ +.\" $OpenBSD: ip.4,v 1.30 2011/06/15 09:13:32 mikeb Exp $ .\" $NetBSD: ip.4,v 1.3 1994/11/30 16:22:19 jtc Exp $ .\" .\" Copyright (c) 1983, 1991, 1993 @@ -30,7 +30,7 @@ .\" .\" @(#)ip.4 8.2 (Berkeley) 11/30/93 .\" -.Dd $Mdocdate: February 3 2011 $ +.Dd $Mdocdate: June 15 2011 $ .Dt IP 4 .Os .Sh NAME @@ -221,7 +221,42 @@ The regular range of non-reserved ports. A high range, for fun. .It Dv IP_PORTRANGE_LOW Reserved ports; between 600 and 1023. +.Ed +.Pp +If the +.Dv IP_RECVRTABLE +option is enabled on a +.Dv SOCK_DGRAM +socket, +the +.Xr recvmsg 2 +call will return the source routing domain for a +.Tn UDP +datagram. +The +.Va msg_control +field in the +.Vt msghdr +structure points to a buffer that contains a +.Vt cmsghdr +structure followed by the routing table id. +The +.Vt cmsghdr +fields have the following values: +.Bd -literal -offset indent +cmsg_len = CMSG_LEN(sizeof(u_int)) +cmsg_level = IPPROTO_IP +cmsg_type = IP_RECVRTABLE .El +.Pp +The +.Dv SO_RTABLE +option can get or set a routing domain of the socket. +The actual routing table number is supplied as an integer argument: +.Bd -literal -offset indent +int rtid = 1; +setsockopt(s, IPPROTO_IP, SO_RTABLE, &rtid, sizeof(rtid)); +.Ed .Ss "Multicast Options" .Tn IP multicasting is supported only on |