Document IP_BINDANY IP socket option.
Reviewed by: brueffer
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2020-12-20 02:59:44 +00:00
svn path=/head/; revision=193218
@ -32,7 +32,7 @@
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.\" @(#)ip.4 8.2 (Berkeley) 11/30/93
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.\" $FreeBSD$
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.\"
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.Dd March 9, 2009
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.Dd June 1, 2009
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.Dt IP 4
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.Os
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.Sh NAME
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@ -243,6 +243,23 @@ socket level option, otherwise the
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.Dv IP_ONESBCAST option has no effect.
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.Pp
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If the
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.Dv IP_BINDANY
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option is enabled on a
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.Dv SOCK_STREAM ,
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.Dv SOCK_DGRAM
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or a
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.Dv SOCK_RAW
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socket, one can
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.Xr bind 2
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to any address, even one not bound to any available network interface in the
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system.
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This functionality (in conjunction with special firewall rules) can be used for
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implementing a transparent proxy.
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The
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.Dv PRIV_NETINET_BINDANY
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privilege is needed to set this option.
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.Pp
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If the
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.Dv IP_RECVTTL
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option is enabled on a
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.Dv SOCK_DGRAM
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