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From: Adrian Chadd <adrian@FreeBSD.org>
To: Perforce Change Reviews <perforce@freebsd.org>
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Subject: PERFORCE change 132710 for review
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http://perforce.freebsd.org/chv.cgi?CH=132710

Change 132710 by adrian@wendy on 2008/01/07 14:18:50

	Bring over more of Julians' initial work.

Affected files ...

.. //depot/projects/adrian_spoof_clientip/src/share/man/man4/ip.4#2 edit

Differences ...

==== //depot/projects/adrian_spoof_clientip/src/share/man/man4/ip.4#2 (text+ko) ====

@@ -292,6 +292,29 @@
 cmsg_type = IP_RECVIF
 .Ed
 .Pp
+If the
+.Dv IP_NONLOCALOK
+options is set then the checking of local bind addresses against addresses
+assigned to local interfaces is disabled.
+The kernel must have been compiled with the
+.Dv IP_NONLOCALBIND option, and the sysctl
+.Va net.inet.ip.nonlocalok
+should be set to 1.
+The option needs to be set on the socket before the
+.Xr bind 2
+system call is used on it.
+.Bd -literal
+u_char spoofing = 1;   /* 0 = disable (default), 1 = enable */
+
+setsockopt(s, IPPROTO_IP, IP_NONLOCALOK, &spoofing, sizeof(spoofing));
+ret = bind (...);
+.Ed
+.Pp
+This behaviour is not for general use and is
+included for use in servers that are implementing fully
+transparent proxies. Use of this option on general purpose
+systems is strongly discouraged.
+.Pp
 .Dv IP_PORTRANGE
 may be used to set the port range used for selecting a local port number
 on a socket with an unspecified (zero) port number.