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On Jan 18, 2010, at 2:33 PM, Amedeo Bonfiglio wrote:

> Hi all,
> using sctplib-1.0.9 I found that it is not possible to register two sctp
> instances using the same port number, but different ip addresses.
> This violates the SCTP specification, and so I fixed it modifying the file
> disribution.c.
This does not violate the specification... It is a limitation of the
implementation.
This is done on purpose to keep things simple...

Best regards
Michael
> I implemented a quick&dirt solution in order to go ahead with my tests.
> NOTE: my solution is not really correct because I have removed any check
> about seizedPorts, while I should check for unique <port/ip> pairs.
> Nevertheless, below is the output of 'diff distribution.c
> distribuion.c-fixed'
>
> 269c269
> < static unsigned char portsSeized[0x10000];
> ---
> > static char portsSeized[0x10000]; //Amedeo: see comment at allocatePort()
> 626,631c626,631
> < if(portsSeized[port] == 0) {
> < portsSeized[port] = 1;
> < numberOfSeizedPorts++;
> < return(port);
> < }
> < return(0);
> ---
> > //Amedeo - Fix in order to allow to register two sctp instances using
> > different IPs, but same port.
> > // This fix is error-prone because it never checks if a port is
> > avaiable or
> > // not. A more complete fix must handle unique <ip/port> pairs.
> > portsSeized[port]++;
> > numberOfSeizedPorts++;
> > return(port);
> 654c654
> < portsSeized[seizePort] = 1;
> ---
> > portsSeized[seizePort]++; //Amedeo: see comment at allocatePort()
> 672c672,676
> < portsSeized[portSeized] = 0;
> ---
> > if ( portsSeized[portSeized] < 0 ) //Amedeo: see comment at
> > allocatePort()
> > {
> > portsSeized[portSeized] = 0;
> > error_log(ERROR_MINOR, "Warning: releasePort - reset to 0");
> > }
>
>
> Kind regards,
> Amedeo
>
> _______________________________________________
> sctp-discussion mailing list
> sctp-discussion AT sctp.de
> http://www.sctp.de/mailman/listinfo/sctp-discussion
>

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• [SCTP-Discussion] problems registering sctp instances using the same port, Amedeo Bonfiglio, 01/18/2010
  • Re: [SCTP-Discussion] problems registering sctp instances using the same port, Michael Tüxen, 01/21/2010

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