Any knowledge for sysctl? Post: 13069

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Special Forums IP Networking Any knowledge for sysctl? Post 13069 by developer on Thursday 10th of January 2002 06:02:43 PM

01-10-2002

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What I am trying to do is to develop a micromobility protocol, i.e. a protocol that will allow users to move from one place to another while containing all the already active connections. From the TCP/IP protocol stuck point of view the protocol I am developing lyies on top of IP so I couldn't use either TCP sockets or UDP sockets only RAW sockets. RAW sockets is not a problem from the communication point of view, I already have accomplished a big part of the protocol. The problem is that a damn message requires the source IP field of the IP packet to be set to zero. Now if you try to set the address to zero (INADDR_ANY) the kernel will set the source IP address to the IP address of the outgoing interface, that applies even if you set the IP_HDRINCL socket option and try to build the IP header from scrutch. In order to prevent the kernel from changing the source IP address I tryed to set the proc.sys.net.ipv4.ip_nonlocal_bind flag as I described but still this doesn't seam to work.
To conclude I am quite sure that the code is OK and the problem is defenitelly some kernel configurations because I saw an implementation of the DHCP, which also requires the source IP address of the first message to be set to zero, and the code was the same as mine.

Last edited by developer; 01-10-2002 at 07:08 PM..

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LEARN ABOUT BSD

socketpair

SOCKETPAIR(2)							System Calls Manual						     SOCKETPAIR(2)

NAME

       socketpair - create a pair of connected sockets

SYNOPSIS

       #include <sys/types.h>
       #include <sys/socket.h>

       socketpair(d, type, protocol, sv)
       int d, type, protocol;
       int sv[2];

DESCRIPTION

       The socketpair call creates an unnamed pair of connected sockets in the specified domain d, of the specified type, and using the optionally
       specified protocol.  The descriptors used in referencing the new sockets are returned in sv[0] and sv[1].  The two  sockets  are  indistin-
       guishable.

DIAGNOSTICS

       A 0 is returned if the call succeeds, -1 if it fails.

ERRORS

       The call succeeds unless:

       [EMFILE] 	   Too many descriptors are in use by this process.

       [EAFNOSUPPORT]	   The specified address family is not supported on this machine.

       [EPROTONOSUPPORT]   The specified protocol is not supported on this machine.

       [EOPNOSUPPORT]	   The specified protocol does not support creation of socket pairs.

       [EFAULT] 	   The address sv does not specify a valid part of the process address space.

SEE ALSO

       read(2), write(2), pipe(2)

BUGS

       This call is currently implemented only for the UNIX domain.

4.2 Berkeley Distribution					   May 15, 1985 						     SOCKETPAIR(2)