Date: Wed, 12 Sep 2012 10:09:34 +0000 (UTC) From: Gleb Smirnoff <glebius@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r240386 - head/share/man/man4 Message-ID: <201209121009.q8CA9Y2Y043059@svn.freebsd.org>
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Author: glebius Date: Wed Sep 12 10:09:34 2012 New Revision: 240386 URL: http://svn.freebsd.org/changeset/base/240386 Log: Document conditions for IP_SENDSRCADDR socket option. Obtained from: r167342 commit message Modified: head/share/man/man4/ip.4 Modified: head/share/man/man4/ip.4 ============================================================================== --- head/share/man/man4/ip.4 Wed Sep 12 09:50:17 2012 (r240385) +++ head/share/man/man4/ip.4 Wed Sep 12 10:09:34 2012 (r240386) @@ -32,7 +32,7 @@ .\" @(#)ip.4 8.2 (Berkeley) 11/30/93 .\" $FreeBSD$ .\" -.Dd June 15, 2012 +.Dd September 12, 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 +187,22 @@ cmsg_level = IPPROTO_IP cmsg_type = IP_SENDSRCADDR .Ed .Pp +The socket should be bound to a local port. +The socket may be bound or not bound to a local address. +In the former case address supplied with +.Dv IP_SENDSRCADDR +overrides bound address. +If the socket is bound to a local address and the address supplied with +.Dv IP_SENDSRCADDR +is +.Dv INADDR_ANY , +then bound address is overriden via generic source address selection logic, +which would choose IP address of interface closest to destination. +If the socket is not bound to a local address, then address supplied with +.Dv IP_SENDSRCADDR +can't be +.Dv INADDR_ANY . +.Pp For convenience, .Dv IP_SENDSRCADDR is defined to have the same value as
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