2005-04-17 06:20:36 +08:00
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/*
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* Declarations of X.25 Packet Layer type objects.
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*
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* History
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* nov/17/96 Jonathan Naylor Initial version.
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* mar/20/00 Daniela Squassoni Disabling/enabling of facilities
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* negotiation.
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*/
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#ifndef _X25_H
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#define _X25_H
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#include <linux/x25.h>
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#include <net/sock.h>
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#define X25_ADDR_LEN 16
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#define X25_MAX_L2_LEN 18 /* 802.2 LLC */
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#define X25_STD_MIN_LEN 3
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#define X25_EXT_MIN_LEN 4
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#define X25_GFI_SEQ_MASK 0x30
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#define X25_GFI_STDSEQ 0x10
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#define X25_GFI_EXTSEQ 0x20
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#define X25_Q_BIT 0x80
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#define X25_D_BIT 0x40
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#define X25_STD_M_BIT 0x10
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#define X25_EXT_M_BIT 0x01
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#define X25_CALL_REQUEST 0x0B
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#define X25_CALL_ACCEPTED 0x0F
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#define X25_CLEAR_REQUEST 0x13
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#define X25_CLEAR_CONFIRMATION 0x17
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#define X25_DATA 0x00
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#define X25_INTERRUPT 0x23
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#define X25_INTERRUPT_CONFIRMATION 0x27
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#define X25_RR 0x01
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#define X25_RNR 0x05
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#define X25_REJ 0x09
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#define X25_RESET_REQUEST 0x1B
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#define X25_RESET_CONFIRMATION 0x1F
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#define X25_REGISTRATION_REQUEST 0xF3
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#define X25_REGISTRATION_CONFIRMATION 0xF7
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#define X25_RESTART_REQUEST 0xFB
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#define X25_RESTART_CONFIRMATION 0xFF
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#define X25_DIAGNOSTIC 0xF1
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#define X25_ILLEGAL 0xFD
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/* Define the various conditions that may exist */
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#define X25_COND_ACK_PENDING 0x01
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#define X25_COND_OWN_RX_BUSY 0x02
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#define X25_COND_PEER_RX_BUSY 0x04
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/* Define Link State constants. */
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enum {
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X25_STATE_0, /* Ready */
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X25_STATE_1, /* Awaiting Call Accepted */
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X25_STATE_2, /* Awaiting Clear Confirmation */
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X25_STATE_3, /* Data Transfer */
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X25_STATE_4 /* Awaiting Reset Confirmation */
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};
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enum {
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X25_LINK_STATE_0,
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X25_LINK_STATE_1,
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X25_LINK_STATE_2,
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X25_LINK_STATE_3
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};
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#define X25_DEFAULT_T20 (180 * HZ) /* Default T20 value */
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#define X25_DEFAULT_T21 (200 * HZ) /* Default T21 value */
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#define X25_DEFAULT_T22 (180 * HZ) /* Default T22 value */
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#define X25_DEFAULT_T23 (180 * HZ) /* Default T23 value */
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#define X25_DEFAULT_T2 (3 * HZ) /* Default ack holdback value */
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#define X25_DEFAULT_WINDOW_SIZE 2 /* Default Window Size */
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#define X25_DEFAULT_PACKET_SIZE X25_PS128 /* Default Packet Size */
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#define X25_DEFAULT_THROUGHPUT 0x0A /* Deafult Throughput */
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#define X25_DEFAULT_REVERSE 0x00 /* Default Reverse Charging */
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[X25]: Fast select with no restriction on response
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>
2005-06-23 13:16:17 +08:00
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#define X25_DENY_ACCPT_APPRV 0x01 /* Default value */
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#define X25_ALLOW_ACCPT_APPRV 0x00 /* Control enabled */
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2005-04-17 06:20:36 +08:00
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#define X25_SMODULUS 8
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#define X25_EMODULUS 128
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/*
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* X.25 Facilities constants.
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*/
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#define X25_FAC_CLASS_MASK 0xC0
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#define X25_FAC_CLASS_A 0x00
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#define X25_FAC_CLASS_B 0x40
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#define X25_FAC_CLASS_C 0x80
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#define X25_FAC_CLASS_D 0xC0
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[X25]: Fast select with no restriction on response
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>
2005-06-23 13:16:17 +08:00
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#define X25_FAC_REVERSE 0x01 /* also fast select */
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2005-04-17 06:20:36 +08:00
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#define X25_FAC_THROUGHPUT 0x02
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#define X25_FAC_PACKET_SIZE 0x42
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#define X25_FAC_WINDOW_SIZE 0x43
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#define X25_MAX_FAC_LEN 20 /* Plenty to spare */
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#define X25_MAX_CUD_LEN 128
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/**
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* struct x25_route - x25 routing entry
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* @node - entry in x25_list_lock
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* @address - Start of address range
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* @sigdigits - Number of sig digits
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* @dev - More than one for MLP
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* @refcnt - reference counter
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*/
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struct x25_route {
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struct list_head node;
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struct x25_address address;
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unsigned int sigdigits;
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struct net_device *dev;
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atomic_t refcnt;
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};
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struct x25_neigh {
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struct list_head node;
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struct net_device *dev;
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unsigned int state;
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unsigned int extended;
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struct sk_buff_head queue;
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unsigned long t20;
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struct timer_list t20timer;
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unsigned long global_facil_mask;
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atomic_t refcnt;
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};
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struct x25_sock {
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struct sock sk;
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struct x25_address source_addr, dest_addr;
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struct x25_neigh *neighbour;
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[X25]: Selective sub-address matching with call user data.
From: Shaun Pereira <spereira@tusc.com.au>
This is the first (independent of the second) patch of two that I am
working on with x25 on linux (tested with xot on a cisco router). Details
are as follows.
Current state of module:
A server using the current implementation (2.6.11.7) of the x25 module will
accept a call request/ incoming call packet at the listening x.25 address,
from all callers to that address, as long as NO call user data is present
in the packet header.
If the server needs to choose to accept a particular call request/ incoming
call packet arriving at its listening x25 address, then the kernel has to
allow a match of call user data present in the call request packet with its
own. This is required when multiple servers listen at the same x25 address
and device interface. The kernel currently matches ALL call user data, if
present.
Current Changes:
This patch is a follow up to the patch submitted previously by Andrew
Hendry, and allows the user to selectively control the number of octets of
call user data in the call request packet, that the kernel will match. By
default no call user data is matched, even if call user data is present.
To allow call user data matching, a cudmatchlength > 0 has to be passed
into the kernel after which the passed number of octets will be matched.
Otherwise the kernel behavior is exactly as the original implementation.
This patch also ensures that as is normally the case, no call user data
will be present in the Call accepted / call connected packet sent back to
the caller
Future Changes on next patch:
There are cases however when call user data may be present in the call
accepted packet. According to the X.25 recommendation (ITU-T 10/96)
section 5.2.3.2 call user data may be present in the call accepted packet
provided the fast select facility is used. My next patch will include this
fast select utility and the ability to send up to 128 octets call user data
in the call accepted packet provided the fast select facility is used. I
am currently testing this, again with xot on linux and cisco.
Signed-off-by: Shaun Pereira <spereira@tusc.com.au>
(With a fix from Alexey Dobriyan <adobriyan@gmail.com>)
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-06-23 13:15:01 +08:00
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unsigned int lci, cudmatchlength;
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[X25]: Fast select with no restriction on response
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>
2005-06-23 13:16:17 +08:00
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unsigned char state, condition, qbitincl, intflag, accptapprv;
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2005-04-17 06:20:36 +08:00
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unsigned short vs, vr, va, vl;
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unsigned long t2, t21, t22, t23;
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unsigned short fraglen;
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struct sk_buff_head ack_queue;
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struct sk_buff_head fragment_queue;
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struct sk_buff_head interrupt_in_queue;
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struct sk_buff_head interrupt_out_queue;
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struct timer_list timer;
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struct x25_causediag causediag;
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struct x25_facilities facilities;
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struct x25_calluserdata calluserdata;
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unsigned long vc_facil_mask; /* inc_call facilities mask */
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};
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static inline struct x25_sock *x25_sk(const struct sock *sk)
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{
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return (struct x25_sock *)sk;
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}
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/* af_x25.c */
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extern int sysctl_x25_restart_request_timeout;
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extern int sysctl_x25_call_request_timeout;
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extern int sysctl_x25_reset_request_timeout;
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extern int sysctl_x25_clear_request_timeout;
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extern int sysctl_x25_ack_holdback_timeout;
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extern int x25_addr_ntoa(unsigned char *, struct x25_address *,
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struct x25_address *);
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extern int x25_addr_aton(unsigned char *, struct x25_address *,
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struct x25_address *);
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extern struct sock *x25_find_socket(unsigned int, struct x25_neigh *);
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extern void x25_destroy_socket(struct sock *);
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extern int x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int);
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extern void x25_kill_by_neigh(struct x25_neigh *);
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/* x25_dev.c */
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extern void x25_send_frame(struct sk_buff *, struct x25_neigh *);
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2005-08-10 10:34:12 +08:00
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extern int x25_lapb_receive_frame(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
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2005-04-17 06:20:36 +08:00
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extern void x25_establish_link(struct x25_neigh *);
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extern void x25_terminate_link(struct x25_neigh *);
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/* x25_facilities.c */
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extern int x25_parse_facilities(struct sk_buff *, struct x25_facilities *, unsigned long *);
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extern int x25_create_facilities(unsigned char *, struct x25_facilities *, unsigned long);
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extern int x25_negotiate_facilities(struct sk_buff *, struct sock *, struct x25_facilities *);
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extern void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *);
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/* x25_in.c */
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extern int x25_process_rx_frame(struct sock *, struct sk_buff *);
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extern int x25_backlog_rcv(struct sock *, struct sk_buff *);
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/* x25_link.c */
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extern void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short);
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extern void x25_link_device_up(struct net_device *);
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extern void x25_link_device_down(struct net_device *);
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extern void x25_link_established(struct x25_neigh *);
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extern void x25_link_terminated(struct x25_neigh *);
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extern void x25_transmit_clear_request(struct x25_neigh *, unsigned int, unsigned char);
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extern void x25_transmit_link(struct sk_buff *, struct x25_neigh *);
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extern int x25_subscr_ioctl(unsigned int, void __user *);
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extern struct x25_neigh *x25_get_neigh(struct net_device *);
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extern void x25_link_free(void);
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/* x25_neigh.c */
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static __inline__ void x25_neigh_hold(struct x25_neigh *nb)
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{
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atomic_inc(&nb->refcnt);
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}
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static __inline__ void x25_neigh_put(struct x25_neigh *nb)
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{
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if (atomic_dec_and_test(&nb->refcnt))
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kfree(nb);
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}
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/* x25_out.c */
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extern int x25_output(struct sock *, struct sk_buff *);
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extern void x25_kick(struct sock *);
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extern void x25_enquiry_response(struct sock *);
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/* x25_route.c */
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extern struct x25_route *x25_get_route(struct x25_address *addr);
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extern struct net_device *x25_dev_get(char *);
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extern void x25_route_device_down(struct net_device *dev);
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extern int x25_route_ioctl(unsigned int, void __user *);
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extern void x25_route_free(void);
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static __inline__ void x25_route_hold(struct x25_route *rt)
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{
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atomic_inc(&rt->refcnt);
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}
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static __inline__ void x25_route_put(struct x25_route *rt)
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{
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if (atomic_dec_and_test(&rt->refcnt))
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kfree(rt);
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}
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/* x25_subr.c */
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extern void x25_clear_queues(struct sock *);
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extern void x25_frames_acked(struct sock *, unsigned short);
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extern void x25_requeue_frames(struct sock *);
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extern int x25_validate_nr(struct sock *, unsigned short);
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extern void x25_write_internal(struct sock *, int);
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extern int x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *, int *);
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extern void x25_disconnect(struct sock *, int, unsigned char, unsigned char);
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/* x25_timer.c */
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extern void x25_start_heartbeat(struct sock *);
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extern void x25_start_t2timer(struct sock *);
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extern void x25_start_t21timer(struct sock *);
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extern void x25_start_t22timer(struct sock *);
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extern void x25_start_t23timer(struct sock *);
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extern void x25_stop_heartbeat(struct sock *);
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extern void x25_stop_timer(struct sock *);
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extern unsigned long x25_display_timer(struct sock *);
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extern void x25_check_rbuf(struct sock *);
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/* sysctl_net_x25.c */
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extern void x25_register_sysctl(void);
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extern void x25_unregister_sysctl(void);
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struct x25_skb_cb {
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unsigned flags;
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};
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#define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb))
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extern struct hlist_head x25_list;
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extern rwlock_t x25_list_lock;
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extern struct list_head x25_route_list;
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extern rwlock_t x25_route_list_lock;
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extern int x25_proc_init(void);
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extern void x25_proc_exit(void);
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#endif
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