Date: Wed, 24 Oct 2012 10:36:34 +0000 (UTC) From: Gleb Smirnoff <glebius@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org Subject: svn commit: r241997 - stable/9/share/man/man4 Message-ID: <201210241036.q9OAaYP2096085@svn.freebsd.org>
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Author: glebius Date: Wed Oct 24 10:36:33 2012 New Revision: 241997 URL: http://svn.freebsd.org/changeset/base/241997 Log: Merge r240386, r240735 from head: Document conditions for IP_SENDSRCADDR socket option. Obtained from: r167342 commit message Modified: stable/9/share/man/man4/ip.4 Directory Properties: stable/9/share/man/man4/ (props changed) Modified: stable/9/share/man/man4/ip.4 ============================================================================== --- stable/9/share/man/man4/ip.4 Wed Oct 24 10:32:39 2012 (r241996) +++ stable/9/share/man/man4/ip.4 Wed Oct 24 10:36:33 2012 (r241997) @@ -32,7 +32,7 @@ .\" @(#)ip.4 8.2 (Berkeley) 11/30/93 .\" $FreeBSD$ .\" -.Dd June 12, 2012 +.Dd September 20, 2012 .Dt IP 4 .Os .Sh NAME @@ -172,9 +172,7 @@ cmsg_type = IP_RECVDSTADDR .Pp The source address to be used for outgoing .Tn UDP -datagrams on a socket that is not bound to a specific -.Tn IP -address can be specified as ancillary data with a type code of +datagrams on a socket can be specified as ancillary data with a type code of .Dv IP_SENDSRCADDR . The msg_control field in the msghdr structure should point to a buffer that contains a @@ -189,6 +187,20 @@ cmsg_level = IPPROTO_IP cmsg_type = IP_SENDSRCADDR .Ed .Pp +The socket should be either bound to +.Dv INADDR_ANY +and a local port, and the address supplied with +.Dv IP_SENDSRCADDR +should't be +.Dv INADDR_ANY , +or the socket should be bound to a local address and the address supplied with +.Dv IP_SENDSRCADDR +should be +.Dv INADDR_ANY . +In the latter case bound address is overriden via generic source address +selection logic, which would choose IP address of interface closest to +destination. +.Pp For convenience, .Dv IP_SENDSRCADDR is defined to have the same value as
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