ebc3f64b86
This patch is a follow up to patch 1 regarding "Selective Sub Address matching with call user data". It allows use of the Fast-Select-Acceptance optional user facility for X.25. This patch just implements fast select with no restriction on response (NRR). What this means (according to ITU-T Recomendation 10/96 section 6.16) is that if in an incoming call packet, the relevant facility bits are set for fast-select-NRR, then the called DTE can issue a direct response to the incoming packet using a call-accepted packet that contains call-user-data. This patch allows such a response. The called DTE can also respond with a clear-request packet that contains call-user-data. However, this feature is currently not implemented by the patch. How is Fast Select Acceptance used? By default, the system does not allow fast select acceptance (as before). To enable a response to fast select acceptance, After a listen socket in created and bound as follows socket(AF_X25, SOCK_SEQPACKET, 0); bind(call_soc, (struct sockaddr *)&locl_addr, sizeof(locl_addr)); but before a listen system call is made, the following ioctl should be used. ioctl(call_soc,SIOCX25CALLACCPTAPPRV); Now the listen system call can be made listen(call_soc, 4); After this, an incoming-call packet will be accepted, but no call-accepted packet will be sent back until the following system call is made on the socket that accepts the call ioctl(vc_soc,SIOCX25SENDCALLACCPT); The network (or cisco xot router used for testing here) will allow the application server's call-user-data in the call-accepted packet, provided the call-request was made with Fast-select NRR. Signed-off-by: Shaun Pereira <spereira@tusc.com.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
124 lines
2.8 KiB
C
124 lines
2.8 KiB
C
/*
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* These are the public elements of the Linux kernel X.25 implementation.
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*
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* History
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* mar/20/00 Daniela Squassoni Disabling/enabling of facilities
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* negotiation.
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* apr/02/05 Shaun Pereira Selective sub address matching with
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* call user data
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*/
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#ifndef X25_KERNEL_H
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#define X25_KERNEL_H
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#define SIOCX25GSUBSCRIP (SIOCPROTOPRIVATE + 0)
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#define SIOCX25SSUBSCRIP (SIOCPROTOPRIVATE + 1)
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#define SIOCX25GFACILITIES (SIOCPROTOPRIVATE + 2)
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#define SIOCX25SFACILITIES (SIOCPROTOPRIVATE + 3)
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#define SIOCX25GCALLUSERDATA (SIOCPROTOPRIVATE + 4)
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#define SIOCX25SCALLUSERDATA (SIOCPROTOPRIVATE + 5)
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#define SIOCX25GCAUSEDIAG (SIOCPROTOPRIVATE + 6)
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#define SIOCX25SCUDMATCHLEN (SIOCPROTOPRIVATE + 7)
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#define SIOCX25CALLACCPTAPPRV (SIOCPROTOPRIVATE + 8)
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#define SIOCX25SENDCALLACCPT (SIOCPROTOPRIVATE + 9)
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/*
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* Values for {get,set}sockopt.
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*/
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#define X25_QBITINCL 1
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/*
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* X.25 Packet Size values.
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*/
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#define X25_PS16 4
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#define X25_PS32 5
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#define X25_PS64 6
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#define X25_PS128 7
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#define X25_PS256 8
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#define X25_PS512 9
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#define X25_PS1024 10
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#define X25_PS2048 11
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#define X25_PS4096 12
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/*
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* An X.121 address, it is held as ASCII text, null terminated, up to 15
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* digits and a null terminator.
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*/
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struct x25_address {
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char x25_addr[16];
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};
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/*
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* Linux X.25 Address structure, used for bind, and connect mostly.
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*/
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struct sockaddr_x25 {
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sa_family_t sx25_family; /* Must be AF_X25 */
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struct x25_address sx25_addr; /* X.121 Address */
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};
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/*
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* DTE/DCE subscription options.
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*
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* As this is missing lots of options, user should expect major
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* changes of this structure in 2.5.x which might break compatibilty.
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* The somewhat ugly dimension 200-sizeof() is needed to maintain
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* backward compatibility.
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*/
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struct x25_subscrip_struct {
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char device[200-sizeof(unsigned long)];
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unsigned long global_facil_mask; /* 0 to disable negotiation */
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unsigned int extended;
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};
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/* values for above global_facil_mask */
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#define X25_MASK_REVERSE 0x01
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#define X25_MASK_THROUGHPUT 0x02
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#define X25_MASK_PACKET_SIZE 0x04
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#define X25_MASK_WINDOW_SIZE 0x08
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/*
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* Routing table control structure.
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*/
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struct x25_route_struct {
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struct x25_address address;
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unsigned int sigdigits;
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char device[200];
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};
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/*
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* Facilities structure.
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*/
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struct x25_facilities {
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unsigned int winsize_in, winsize_out;
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unsigned int pacsize_in, pacsize_out;
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unsigned int throughput;
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unsigned int reverse;
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};
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/*
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* Call User Data structure.
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*/
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struct x25_calluserdata {
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unsigned int cudlength;
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unsigned char cuddata[128];
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};
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/*
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* Call clearing Cause and Diagnostic structure.
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*/
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struct x25_causediag {
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unsigned char cause;
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unsigned char diagnostic;
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};
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/*
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* Further optional call user data match length selection
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*/
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struct x25_subaddr {
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unsigned int cudmatchlength;
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};
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#endif
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