svn commit: r186955 - in head/sys: conf netinet

Attila Nagy bra at
Fri Jan 9 11:42:56 PST 2009


Adrian Chadd wrote:
> Author: adrian
> Date: Fri Jan  9 16:02:19 2009
> New Revision: 186955
> URL:
> Log:
>   Implement a new IP option (not compiled/enabled by default) to allow
>   applications to specify a non-local IP address when bind()'ing a socket
>   to a local endpoint.
>   This allows applications to spoof the client IP address of connections
>   if (obviously!) they somehow are able to receive the traffic normally
>   destined to said clients.
>   This patch doesn't include any changes to ipfw or the bridging code to
>   redirect the client traffic through the PCB checks so TCP gets a shot
>   at it. The normal behaviour is that packets with a non-local destination
>   IP address are not handled locally. This can be dealth with some IPFW hackery;
>   modifications to IPFW to make this less hacky will occur in subsequent
>   commmits.
>   Thanks to Julian Elischer and others at Ironport. This work was approved
>   and donated before Cisco acquired them.
>   Obtained from:	Julian Elischer and others
>   MFC after:	2 weeks
Wouldn't it be better to implement existing interfaces for that?
OpenBSD has a SO_BINDANY socket option and it seems it's also in BSD/OS:

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