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[/] [test_project/] [trunk/] [linux_sd_driver/] [net/] [x25/] [x25_subr.c] - Blame information for rev 82

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/*
 *      X.25 Packet Layer release 002
 *
 *      This is ALPHA test software. This code may break your machine,
 *      randomly fail to work with new releases, misbehave and/or generally
 *      screw up. It might even work.
 *
 *      This code REQUIRES 2.1.15 or higher
 *
 *      This module:
 *              This module is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *
 *      History
 *      X.25 001        Jonathan Naylor   Started coding.
 *      X.25 002        Jonathan Naylor   Centralised disconnection processing.
 *      mar/20/00       Daniela Squassoni Disabling/enabling of facilities
 *                                        negotiation.
 *      jun/24/01       Arnaldo C. Melo   use skb_queue_purge, cleanups
 *      apr/04/15       Shaun Pereira           Fast select with no
 *                                              restriction on response.
 */
 
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <net/x25.h>
 
/*
 *      This routine purges all of the queues of frames.
 */
void x25_clear_queues(struct sock *sk)
{
        struct x25_sock *x25 = x25_sk(sk);
 
        skb_queue_purge(&sk->sk_write_queue);
        skb_queue_purge(&x25->ack_queue);
        skb_queue_purge(&x25->interrupt_in_queue);
        skb_queue_purge(&x25->interrupt_out_queue);
        skb_queue_purge(&x25->fragment_queue);
}
 
 
/*
 * This routine purges the input queue of those frames that have been
 * acknowledged. This replaces the boxes labelled "V(a) <- N(r)" on the
 * SDL diagram.
*/
void x25_frames_acked(struct sock *sk, unsigned short nr)
{
        struct sk_buff *skb;
        struct x25_sock *x25 = x25_sk(sk);
        int modulus = x25->neighbour->extended ? X25_EMODULUS : X25_SMODULUS;
 
        /*
         * Remove all the ack-ed frames from the ack queue.
         */
        if (x25->va != nr)
                while (skb_peek(&x25->ack_queue) && x25->va != nr) {
                        skb = skb_dequeue(&x25->ack_queue);
                        kfree_skb(skb);
                        x25->va = (x25->va + 1) % modulus;
                }
}
 
void x25_requeue_frames(struct sock *sk)
{
        struct sk_buff *skb, *skb_prev = NULL;
 
        /*
         * Requeue all the un-ack-ed frames on the output queue to be picked
         * up by x25_kick. This arrangement handles the possibility of an empty
         * output queue.
         */
        while ((skb = skb_dequeue(&x25_sk(sk)->ack_queue)) != NULL) {
                if (!skb_prev)
                        skb_queue_head(&sk->sk_write_queue, skb);
                else
                        skb_append(skb_prev, skb, &sk->sk_write_queue);
                skb_prev = skb;
        }
}
 
/*
 *      Validate that the value of nr is between va and vs. Return true or
 *      false for testing.
 */
int x25_validate_nr(struct sock *sk, unsigned short nr)
{
        struct x25_sock *x25 = x25_sk(sk);
        unsigned short vc = x25->va;
        int modulus = x25->neighbour->extended ? X25_EMODULUS : X25_SMODULUS;
 
        while (vc != x25->vs) {
                if (nr == vc)
                        return 1;
                vc = (vc + 1) % modulus;
        }
 
        return nr == x25->vs ? 1 : 0;
}
 
/*
 *  This routine is called when the packet layer internally generates a
 *  control frame.
 */
void x25_write_internal(struct sock *sk, int frametype)
{
        struct x25_sock *x25 = x25_sk(sk);
        struct sk_buff *skb;
        unsigned char  *dptr;
        unsigned char  facilities[X25_MAX_FAC_LEN];
        unsigned char  addresses[1 + X25_ADDR_LEN];
        unsigned char  lci1, lci2;
        /*
         *      Default safe frame size.
         */
        int len = X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
 
        /*
         *      Adjust frame size.
         */
        switch (frametype) {
                case X25_CALL_REQUEST:
                        len += 1 + X25_ADDR_LEN + X25_MAX_FAC_LEN +
                               X25_MAX_CUD_LEN;
                        break;
                case X25_CALL_ACCEPTED: /* fast sel with no restr on resp */
                        if(x25->facilities.reverse & 0x80) {
                                len += 1 + X25_MAX_FAC_LEN + X25_MAX_CUD_LEN;
                        } else {
                                len += 1 + X25_MAX_FAC_LEN;
                        }
                        break;
                case X25_CLEAR_REQUEST:
                case X25_RESET_REQUEST:
                        len += 2;
                        break;
                case X25_RR:
                case X25_RNR:
                case X25_REJ:
                case X25_CLEAR_CONFIRMATION:
                case X25_INTERRUPT_CONFIRMATION:
                case X25_RESET_CONFIRMATION:
                        break;
                default:
                        printk(KERN_ERR "X.25: invalid frame type %02X\n",
                               frametype);
                        return;
        }
 
        if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
                return;
 
        /*
         *      Space for Ethernet and 802.2 LLC headers.
         */
        skb_reserve(skb, X25_MAX_L2_LEN);
 
        /*
         *      Make space for the GFI and LCI, and fill them in.
         */
        dptr = skb_put(skb, 2);
 
        lci1 = (x25->lci >> 8) & 0x0F;
        lci2 = (x25->lci >> 0) & 0xFF;
 
        if (x25->neighbour->extended) {
                *dptr++ = lci1 | X25_GFI_EXTSEQ;
                *dptr++ = lci2;
        } else {
                *dptr++ = lci1 | X25_GFI_STDSEQ;
                *dptr++ = lci2;
        }
 
        /*
         *      Now fill in the frame type specific information.
         */
        switch (frametype) {
 
                case X25_CALL_REQUEST:
                        dptr    = skb_put(skb, 1);
                        *dptr++ = X25_CALL_REQUEST;
                        len     = x25_addr_aton(addresses, &x25->dest_addr,
                                                &x25->source_addr);
                        dptr    = skb_put(skb, len);
                        memcpy(dptr, addresses, len);
                        len     = x25_create_facilities(facilities,
                                        &x25->facilities,
                                        &x25->dte_facilities,
                                        x25->neighbour->global_facil_mask);
                        dptr    = skb_put(skb, len);
                        memcpy(dptr, facilities, len);
                        dptr = skb_put(skb, x25->calluserdata.cudlength);
                        memcpy(dptr, x25->calluserdata.cuddata,
                               x25->calluserdata.cudlength);
                        x25->calluserdata.cudlength = 0;
                        break;
 
                case X25_CALL_ACCEPTED:
                        dptr    = skb_put(skb, 2);
                        *dptr++ = X25_CALL_ACCEPTED;
                        *dptr++ = 0x00;         /* Address lengths */
                        len     = x25_create_facilities(facilities,
                                                        &x25->facilities,
                                                        &x25->dte_facilities,
                                                        x25->vc_facil_mask);
                        dptr    = skb_put(skb, len);
                        memcpy(dptr, facilities, len);
 
                        /* fast select with no restriction on response
                                allows call user data. Userland must
                                ensure it is ours and not theirs */
                        if(x25->facilities.reverse & 0x80) {
                                dptr = skb_put(skb,
                                        x25->calluserdata.cudlength);
                                memcpy(dptr, x25->calluserdata.cuddata,
                                       x25->calluserdata.cudlength);
                        }
                        x25->calluserdata.cudlength = 0;
                        break;
 
                case X25_CLEAR_REQUEST:
                case X25_RESET_REQUEST:
                        dptr    = skb_put(skb, 3);
                        *dptr++ = frametype;
                        *dptr++ = 0x00;         /* XXX */
                        *dptr++ = 0x00;         /* XXX */
                        break;
 
                case X25_RR:
                case X25_RNR:
                case X25_REJ:
                        if (x25->neighbour->extended) {
                                dptr     = skb_put(skb, 2);
                                *dptr++  = frametype;
                                *dptr++  = (x25->vr << 1) & 0xFE;
                        } else {
                                dptr     = skb_put(skb, 1);
                                *dptr    = frametype;
                                *dptr++ |= (x25->vr << 5) & 0xE0;
                        }
                        break;
 
                case X25_CLEAR_CONFIRMATION:
                case X25_INTERRUPT_CONFIRMATION:
                case X25_RESET_CONFIRMATION:
                        dptr  = skb_put(skb, 1);
                        *dptr = frametype;
                        break;
        }
 
        x25_transmit_link(skb, x25->neighbour);
}
 
/*
 *      Unpick the contents of the passed X.25 Packet Layer frame.
 */
int x25_decode(struct sock *sk, struct sk_buff *skb, int *ns, int *nr, int *q,
               int *d, int *m)
{
        struct x25_sock *x25 = x25_sk(sk);
        unsigned char *frame = skb->data;
 
        *ns = *nr = *q = *d = *m = 0;
 
        switch (frame[2]) {
                case X25_CALL_REQUEST:
                case X25_CALL_ACCEPTED:
                case X25_CLEAR_REQUEST:
                case X25_CLEAR_CONFIRMATION:
                case X25_INTERRUPT:
                case X25_INTERRUPT_CONFIRMATION:
                case X25_RESET_REQUEST:
                case X25_RESET_CONFIRMATION:
                case X25_RESTART_REQUEST:
                case X25_RESTART_CONFIRMATION:
                case X25_REGISTRATION_REQUEST:
                case X25_REGISTRATION_CONFIRMATION:
                case X25_DIAGNOSTIC:
                        return frame[2];
        }
 
        if (x25->neighbour->extended) {
                if (frame[2] == X25_RR  ||
                    frame[2] == X25_RNR ||
                    frame[2] == X25_REJ) {
                        *nr = (frame[3] >> 1) & 0x7F;
                        return frame[2];
                }
        } else {
                if ((frame[2] & 0x1F) == X25_RR  ||
                    (frame[2] & 0x1F) == X25_RNR ||
                    (frame[2] & 0x1F) == X25_REJ) {
                        *nr = (frame[2] >> 5) & 0x07;
                        return frame[2] & 0x1F;
                }
        }
 
        if (x25->neighbour->extended) {
                if ((frame[2] & 0x01) == X25_DATA) {
                        *q  = (frame[0] & X25_Q_BIT) == X25_Q_BIT;
                        *d  = (frame[0] & X25_D_BIT) == X25_D_BIT;
                        *m  = (frame[3] & X25_EXT_M_BIT) == X25_EXT_M_BIT;
                        *nr = (frame[3] >> 1) & 0x7F;
                        *ns = (frame[2] >> 1) & 0x7F;
                        return X25_DATA;
                }
        } else {
                if ((frame[2] & 0x01) == X25_DATA) {
                        *q  = (frame[0] & X25_Q_BIT) == X25_Q_BIT;
                        *d  = (frame[0] & X25_D_BIT) == X25_D_BIT;
                        *m  = (frame[2] & X25_STD_M_BIT) == X25_STD_M_BIT;
                        *nr = (frame[2] >> 5) & 0x07;
                        *ns = (frame[2] >> 1) & 0x07;
                        return X25_DATA;
                }
        }
 
        printk(KERN_DEBUG "X.25: invalid PLP frame %02X %02X %02X\n",
               frame[0], frame[1], frame[2]);
 
        return X25_ILLEGAL;
}
 
void x25_disconnect(struct sock *sk, int reason, unsigned char cause,
                    unsigned char diagnostic)
{
        struct x25_sock *x25 = x25_sk(sk);
 
        x25_clear_queues(sk);
        x25_stop_timer(sk);
 
        x25->lci   = 0;
        x25->state = X25_STATE_0;
 
        x25->causediag.cause      = cause;
        x25->causediag.diagnostic = diagnostic;
 
        sk->sk_state     = TCP_CLOSE;
        sk->sk_err       = reason;
        sk->sk_shutdown |= SEND_SHUTDOWN;
 
        if (!sock_flag(sk, SOCK_DEAD)) {
                sk->sk_state_change(sk);
                sock_set_flag(sk, SOCK_DEAD);
        }
}
 
/*
 * Clear an own-rx-busy condition and tell the peer about this, provided
 * that there is a significant amount of free receive buffer space available.
 */
void x25_check_rbuf(struct sock *sk)
{
        struct x25_sock *x25 = x25_sk(sk);
 
        if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
            (x25->condition & X25_COND_OWN_RX_BUSY)) {
                x25->condition &= ~X25_COND_OWN_RX_BUSY;
                x25->condition &= ~X25_COND_ACK_PENDING;
                x25->vl         = x25->vr;
                x25_write_internal(sk, X25_RR);
                x25_stop_timer(sk);
        }
}
 

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[/] [test_project/] [trunk/] [linux_sd_driver/] [net/] [x25/] [x25_subr.c] - Blame information for rev 82

Line No.	Rev	Author	Line
1	62	marcus.erl	`/*`
2			`* X.25 Packet Layer release 002`
3			`*`
4			`* This is ALPHA test software. This code may break your machine,`
5			`* randomly fail to work with new releases, misbehave and/or generally`
6			`* screw up. It might even work.`
7			`*`
8			`* This code REQUIRES 2.1.15 or higher`
9			`*`
10			`* This module:`
11			`* This module is free software; you can redistribute it and/or`
12			`* modify it under the terms of the GNU General Public License`
13			`* as published by the Free Software Foundation; either version`
14			`* 2 of the License, or (at your option) any later version.`
15			`*`
16			`* History`
17			`* X.25 001 Jonathan Naylor Started coding.`
18			`* X.25 002 Jonathan Naylor Centralised disconnection processing.`
19			`* mar/20/00 Daniela Squassoni Disabling/enabling of facilities`
20			`* negotiation.`
21			`* jun/24/01 Arnaldo C. Melo use skb_queue_purge, cleanups`
22			`* apr/04/15 Shaun Pereira Fast select with no`
23			`* restriction on response.`
24			`*/`
25
26			`#include <linux/kernel.h>`
27			`#include <linux/string.h>`
28			`#include <linux/skbuff.h>`
29			`#include <net/sock.h>`
30			`#include <net/tcp_states.h>`
31			`#include <net/x25.h>`
32
33			`/*`
34			`* This routine purges all of the queues of frames.`
35			`*/`
36			`void x25_clear_queues(struct sock *sk)`
37			`{`
38			`struct x25_sock *x25 = x25_sk(sk);`
39
40			`skb_queue_purge(&sk->sk_write_queue);`
41			`skb_queue_purge(&x25->ack_queue);`
42			`skb_queue_purge(&x25->interrupt_in_queue);`
43			`skb_queue_purge(&x25->interrupt_out_queue);`
44			`skb_queue_purge(&x25->fragment_queue);`
45			`}`
46
47
48			`/*`
49			`* This routine purges the input queue of those frames that have been`
50			`* acknowledged. This replaces the boxes labelled "V(a) <- N(r)" on the`
51			`* SDL diagram.`
52			`*/`
53			`void x25_frames_acked(struct sock *sk, unsigned short nr)`
54			`{`
55			`struct sk_buff *skb;`
56			`struct x25_sock *x25 = x25_sk(sk);`
57			`int modulus = x25->neighbour->extended ? X25_EMODULUS : X25_SMODULUS;`
58
59			`/*`
60			`* Remove all the ack-ed frames from the ack queue.`
61			`*/`
62			`if (x25->va != nr)`
63			`while (skb_peek(&x25->ack_queue) && x25->va != nr) {`
64			`skb = skb_dequeue(&x25->ack_queue);`
65			`kfree_skb(skb);`
66			`x25->va = (x25->va + 1) % modulus;`
67			`}`
68			`}`
69
70			`void x25_requeue_frames(struct sock *sk)`
71			`{`
72			`struct sk_buff skb, skb_prev = NULL;`
73
74			`/*`
75			`* Requeue all the un-ack-ed frames on the output queue to be picked`
76			`* up by x25_kick. This arrangement handles the possibility of an empty`
77			`* output queue.`
78			`*/`
79			`while ((skb = skb_dequeue(&x25_sk(sk)->ack_queue)) != NULL) {`
80			`if (!skb_prev)`
81			`skb_queue_head(&sk->sk_write_queue, skb);`
82			`else`
83			`skb_append(skb_prev, skb, &sk->sk_write_queue);`
84			`skb_prev = skb;`
85			`}`
86			`}`
87
88			`/*`
89			`* Validate that the value of nr is between va and vs. Return true or`
90			`* false for testing.`
91			`*/`
92			`int x25_validate_nr(struct sock *sk, unsigned short nr)`
93			`{`
94			`struct x25_sock *x25 = x25_sk(sk);`
95			`unsigned short vc = x25->va;`
96			`int modulus = x25->neighbour->extended ? X25_EMODULUS : X25_SMODULUS;`
97
98			`while (vc != x25->vs) {`
99			`if (nr == vc)`
100			`return 1;`
101			`vc = (vc + 1) % modulus;`
102			`}`
103
104			`return nr == x25->vs ? 1 : 0;`
105			`}`
106
107			`/*`
108			`* This routine is called when the packet layer internally generates a`
109			`* control frame.`
110			`*/`
111			`void x25_write_internal(struct sock *sk, int frametype)`
112			`{`
113			`struct x25_sock *x25 = x25_sk(sk);`
114			`struct sk_buff *skb;`
115			`unsigned char *dptr;`
116			`unsigned char facilities[X25_MAX_FAC_LEN];`
117			`unsigned char addresses[1 + X25_ADDR_LEN];`
118			`unsigned char lci1, lci2;`
119			`/*`
120			`* Default safe frame size.`
121			`*/`
122			`int len = X25_MAX_L2_LEN + X25_EXT_MIN_LEN;`
123
124			`/*`
125			`* Adjust frame size.`
126			`*/`
127			`switch (frametype) {`
128			`case X25_CALL_REQUEST:`
129			`len += 1 + X25_ADDR_LEN + X25_MAX_FAC_LEN +`
130			`X25_MAX_CUD_LEN;`
131			`break;`
132			`case X25_CALL_ACCEPTED: /* fast sel with no restr on resp */`
133			`if(x25->facilities.reverse & 0x80) {`
134			`len += 1 + X25_MAX_FAC_LEN + X25_MAX_CUD_LEN;`
135			`} else {`
136			`len += 1 + X25_MAX_FAC_LEN;`
137			`}`
138			`break;`
139			`case X25_CLEAR_REQUEST:`
140			`case X25_RESET_REQUEST:`
141			`len += 2;`
142			`break;`
143			`case X25_RR:`
144			`case X25_RNR:`
145			`case X25_REJ:`
146			`case X25_CLEAR_CONFIRMATION:`
147			`case X25_INTERRUPT_CONFIRMATION:`
148			`case X25_RESET_CONFIRMATION:`
149			`break;`
150			`default:`
151			`printk(KERN_ERR "X.25: invalid frame type %02X\n",`
152			`frametype);`
153			`return;`
154			`}`
155
156			`if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)`
157			`return;`
158
159			`/*`
160			`* Space for Ethernet and 802.2 LLC headers.`
161			`*/`
162			`skb_reserve(skb, X25_MAX_L2_LEN);`
163
164			`/*`
165			`* Make space for the GFI and LCI, and fill them in.`
166			`*/`
167			`dptr = skb_put(skb, 2);`
168
169			`lci1 = (x25->lci >> 8) & 0x0F;`
170			`lci2 = (x25->lci >> 0) & 0xFF;`
171
172			`if (x25->neighbour->extended) {`
173			`*dptr++ = lci1 \| X25_GFI_EXTSEQ;`
174			`*dptr++ = lci2;`
175			`} else {`
176			`*dptr++ = lci1 \| X25_GFI_STDSEQ;`
177			`*dptr++ = lci2;`
178			`}`
179
180			`/*`
181			`* Now fill in the frame type specific information.`
182			`*/`
183			`switch (frametype) {`
184
185			`case X25_CALL_REQUEST:`
186			`dptr = skb_put(skb, 1);`
187			`*dptr++ = X25_CALL_REQUEST;`
188			`len = x25_addr_aton(addresses, &x25->dest_addr,`
189			`&x25->source_addr);`
190			`dptr = skb_put(skb, len);`
191			`memcpy(dptr, addresses, len);`
192			`len = x25_create_facilities(facilities,`
193			`&x25->facilities,`
194			`&x25->dte_facilities,`
195			`x25->neighbour->global_facil_mask);`
196			`dptr = skb_put(skb, len);`
197			`memcpy(dptr, facilities, len);`
198			`dptr = skb_put(skb, x25->calluserdata.cudlength);`
199			`memcpy(dptr, x25->calluserdata.cuddata,`
200			`x25->calluserdata.cudlength);`
201			`x25->calluserdata.cudlength = 0;`
202			`break;`
203
204			`case X25_CALL_ACCEPTED:`
205			`dptr = skb_put(skb, 2);`
206			`*dptr++ = X25_CALL_ACCEPTED;`
207			`dptr++ = 0x00; / Address lengths */`
208			`len = x25_create_facilities(facilities,`
209			`&x25->facilities,`
210			`&x25->dte_facilities,`
211			`x25->vc_facil_mask);`
212			`dptr = skb_put(skb, len);`
213			`memcpy(dptr, facilities, len);`
214
215			`/* fast select with no restriction on response`
216			`allows call user data. Userland must`
217			`ensure it is ours and not theirs */`
218			`if(x25->facilities.reverse & 0x80) {`
219			`dptr = skb_put(skb,`
220			`x25->calluserdata.cudlength);`
221			`memcpy(dptr, x25->calluserdata.cuddata,`
222			`x25->calluserdata.cudlength);`
223			`}`
224			`x25->calluserdata.cudlength = 0;`
225			`break;`
226
227			`case X25_CLEAR_REQUEST:`
228			`case X25_RESET_REQUEST:`
229			`dptr = skb_put(skb, 3);`
230			`*dptr++ = frametype;`
231			`dptr++ = 0x00; / XXX */`
232			`dptr++ = 0x00; / XXX */`
233			`break;`
234
235			`case X25_RR:`
236			`case X25_RNR:`
237			`case X25_REJ:`
238			`if (x25->neighbour->extended) {`
239			`dptr = skb_put(skb, 2);`
240			`*dptr++ = frametype;`
241			`*dptr++ = (x25->vr << 1) & 0xFE;`
242			`} else {`
243			`dptr = skb_put(skb, 1);`
244			`*dptr = frametype;`
245			`*dptr++ \|= (x25->vr << 5) & 0xE0;`
246			`}`
247			`break;`
248
249			`case X25_CLEAR_CONFIRMATION:`
250			`case X25_INTERRUPT_CONFIRMATION:`
251			`case X25_RESET_CONFIRMATION:`
252			`dptr = skb_put(skb, 1);`
253			`*dptr = frametype;`
254			`break;`
255			`}`
256
257			`x25_transmit_link(skb, x25->neighbour);`
258			`}`
259
260			`/*`
261			`* Unpick the contents of the passed X.25 Packet Layer frame.`
262			`*/`
263			`int x25_decode(struct sock sk, struct sk_buff skb, int ns, int nr, int *q,`
264			`int d, int m)`
265			`{`
266			`struct x25_sock *x25 = x25_sk(sk);`
267			`unsigned char *frame = skb->data;`
268
269			`ns = nr = q = d = *m = 0;`
270
271			`switch (frame[2]) {`
272			`case X25_CALL_REQUEST:`
273			`case X25_CALL_ACCEPTED:`
274			`case X25_CLEAR_REQUEST:`
275			`case X25_CLEAR_CONFIRMATION:`
276			`case X25_INTERRUPT:`
277			`case X25_INTERRUPT_CONFIRMATION:`
278			`case X25_RESET_REQUEST:`
279			`case X25_RESET_CONFIRMATION:`
280			`case X25_RESTART_REQUEST:`
281			`case X25_RESTART_CONFIRMATION:`
282			`case X25_REGISTRATION_REQUEST:`
283			`case X25_REGISTRATION_CONFIRMATION:`
284			`case X25_DIAGNOSTIC:`
285			`return frame[2];`
286			`}`
287
288			`if (x25->neighbour->extended) {`
289			`if (frame[2] == X25_RR \|\|`
290			`frame[2] == X25_RNR \|\|`
291			`frame[2] == X25_REJ) {`
292			`*nr = (frame[3] >> 1) & 0x7F;`
293			`return frame[2];`
294			`}`
295			`} else {`
296			`if ((frame[2] & 0x1F) == X25_RR \|\|`
297			`(frame[2] & 0x1F) == X25_RNR \|\|`
298			`(frame[2] & 0x1F) == X25_REJ) {`
299			`*nr = (frame[2] >> 5) & 0x07;`
300			`return frame[2] & 0x1F;`
301			`}`
302			`}`
303
304			`if (x25->neighbour->extended) {`
305			`if ((frame[2] & 0x01) == X25_DATA) {`
306			`*q = (frame[0] & X25_Q_BIT) == X25_Q_BIT;`
307			`*d = (frame[0] & X25_D_BIT) == X25_D_BIT;`
308			`*m = (frame[3] & X25_EXT_M_BIT) == X25_EXT_M_BIT;`
309			`*nr = (frame[3] >> 1) & 0x7F;`
310			`*ns = (frame[2] >> 1) & 0x7F;`
311			`return X25_DATA;`
312			`}`
313			`} else {`
314			`if ((frame[2] & 0x01) == X25_DATA) {`
315			`*q = (frame[0] & X25_Q_BIT) == X25_Q_BIT;`
316			`*d = (frame[0] & X25_D_BIT) == X25_D_BIT;`
317			`*m = (frame[2] & X25_STD_M_BIT) == X25_STD_M_BIT;`
318			`*nr = (frame[2] >> 5) & 0x07;`
319			`*ns = (frame[2] >> 1) & 0x07;`
320			`return X25_DATA;`
321			`}`
322			`}`
323
324			`printk(KERN_DEBUG "X.25: invalid PLP frame %02X %02X %02X\n",`
325			`frame[0], frame[1], frame[2]);`
326
327			`return X25_ILLEGAL;`
328			`}`
329
330			`void x25_disconnect(struct sock *sk, int reason, unsigned char cause,`
331			`unsigned char diagnostic)`
332			`{`
333			`struct x25_sock *x25 = x25_sk(sk);`
334
335			`x25_clear_queues(sk);`
336			`x25_stop_timer(sk);`
337
338			`x25->lci = 0;`
339			`x25->state = X25_STATE_0;`
340
341			`x25->causediag.cause = cause;`
342			`x25->causediag.diagnostic = diagnostic;`
343
344			`sk->sk_state = TCP_CLOSE;`
345			`sk->sk_err = reason;`
346			`sk->sk_shutdown \|= SEND_SHUTDOWN;`
347
348			`if (!sock_flag(sk, SOCK_DEAD)) {`
349			`sk->sk_state_change(sk);`
350			`sock_set_flag(sk, SOCK_DEAD);`
351			`}`
352			`}`
353
354			`/*`
355			`* Clear an own-rx-busy condition and tell the peer about this, provided`
356			`* that there is a significant amount of free receive buffer space available.`
357			`*/`
358			`void x25_check_rbuf(struct sock *sk)`
359			`{`
360			`struct x25_sock *x25 = x25_sk(sk);`
361
362			`if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&`
363			`(x25->condition & X25_COND_OWN_RX_BUSY)) {`
364			`x25->condition &= ~X25_COND_OWN_RX_BUSY;`
365			`x25->condition &= ~X25_COND_ACK_PENDING;`
366			`x25->vl = x25->vr;`
367			`x25_write_internal(sk, X25_RR);`
368			`x25_stop_timer(sk);`
369			`}`
370			`}`
371