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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [net/] [lapb/] [lapb_subr.c] - Blame information for rev 17

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/*
 *      LAPB release 002
 *
 *      This code REQUIRES 2.1.15 or higher/ NET3.038
 *
 *      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
 *      LAPB 001        Jonathan Naylor Started Coding
 */
 
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/inet.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <net/lapb.h>
 
/*
 *      This routine purges all the queues of frames.
 */
void lapb_clear_queues(struct lapb_cb *lapb)
{
        skb_queue_purge(&lapb->write_queue);
        skb_queue_purge(&lapb->ack_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 lapb_frames_acked(struct lapb_cb *lapb, unsigned short nr)
{
        struct sk_buff *skb;
        int modulus;
 
        modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : LAPB_SMODULUS;
 
        /*
         * Remove all the ack-ed frames from the ack queue.
         */
        if (lapb->va != nr)
                while (skb_peek(&lapb->ack_queue) && lapb->va != nr) {
                        skb = skb_dequeue(&lapb->ack_queue);
                        kfree_skb(skb);
                        lapb->va = (lapb->va + 1) % modulus;
                }
}
 
void lapb_requeue_frames(struct lapb_cb *lapb)
{
        struct sk_buff *skb, *skb_prev = NULL;
 
        /*
         * Requeue all the un-ack-ed frames on the output queue to be picked
         * up by lapb_kick called from the timer. This arrangement handles the
         * possibility of an empty output queue.
         */
        while ((skb = skb_dequeue(&lapb->ack_queue)) != NULL) {
                if (!skb_prev)
                        skb_queue_head(&lapb->write_queue, skb);
                else
                        skb_append(skb_prev, skb, &lapb->write_queue);
                skb_prev = skb;
        }
}
 
/*
 *      Validate that the value of nr is between va and vs. Return true or
 *      false for testing.
 */
int lapb_validate_nr(struct lapb_cb *lapb, unsigned short nr)
{
        unsigned short vc = lapb->va;
        int modulus;
 
        modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : LAPB_SMODULUS;
 
        while (vc != lapb->vs) {
                if (nr == vc)
                        return 1;
                vc = (vc + 1) % modulus;
        }
 
        return nr == lapb->vs;
}
 
/*
 *      This routine is the centralised routine for parsing the control
 *      information for the different frame formats.
 */
int lapb_decode(struct lapb_cb *lapb, struct sk_buff *skb,
                struct lapb_frame *frame)
{
        frame->type = LAPB_ILLEGAL;
 
#if LAPB_DEBUG > 2
        printk(KERN_DEBUG "lapb: (%p) S%d RX %02X %02X %02X\n",
               lapb->dev, lapb->state,
               skb->data[0], skb->data[1], skb->data[2]);
#endif
 
        /* We always need to look at 2 bytes, sometimes we need
         * to look at 3 and those cases are handled below.
         */
        if (!pskb_may_pull(skb, 2))
                return -1;
 
        if (lapb->mode & LAPB_MLP) {
                if (lapb->mode & LAPB_DCE) {
                        if (skb->data[0] == LAPB_ADDR_D)
                                frame->cr = LAPB_COMMAND;
                        if (skb->data[0] == LAPB_ADDR_C)
                                frame->cr = LAPB_RESPONSE;
                } else {
                        if (skb->data[0] == LAPB_ADDR_C)
                                frame->cr = LAPB_COMMAND;
                        if (skb->data[0] == LAPB_ADDR_D)
                                frame->cr = LAPB_RESPONSE;
                }
        } else {
                if (lapb->mode & LAPB_DCE) {
                        if (skb->data[0] == LAPB_ADDR_B)
                                frame->cr = LAPB_COMMAND;
                        if (skb->data[0] == LAPB_ADDR_A)
                                frame->cr = LAPB_RESPONSE;
                } else {
                        if (skb->data[0] == LAPB_ADDR_A)
                                frame->cr = LAPB_COMMAND;
                        if (skb->data[0] == LAPB_ADDR_B)
                                frame->cr = LAPB_RESPONSE;
                }
        }
 
        skb_pull(skb, 1);
 
        if (lapb->mode & LAPB_EXTENDED) {
                if (!(skb->data[0] & LAPB_S)) {
                        if (!pskb_may_pull(skb, 2))
                                return -1;
                        /*
                         * I frame - carries NR/NS/PF
                         */
                        frame->type       = LAPB_I;
                        frame->ns         = (skb->data[0] >> 1) & 0x7F;
                        frame->nr         = (skb->data[1] >> 1) & 0x7F;
                        frame->pf         = skb->data[1] & LAPB_EPF;
                        frame->control[0] = skb->data[0];
                        frame->control[1] = skb->data[1];
                        skb_pull(skb, 2);
                } else if ((skb->data[0] & LAPB_U) == 1) {
                        if (!pskb_may_pull(skb, 2))
                                return -1;
                        /*
                         * S frame - take out PF/NR
                         */
                        frame->type       = skb->data[0] & 0x0F;
                        frame->nr         = (skb->data[1] >> 1) & 0x7F;
                        frame->pf         = skb->data[1] & LAPB_EPF;
                        frame->control[0] = skb->data[0];
                        frame->control[1] = skb->data[1];
                        skb_pull(skb, 2);
                } else if ((skb->data[0] & LAPB_U) == 3) {
                        /*
                         * U frame - take out PF
                         */
                        frame->type       = skb->data[0] & ~LAPB_SPF;
                        frame->pf         = skb->data[0] & LAPB_SPF;
                        frame->control[0] = skb->data[0];
                        frame->control[1] = 0x00;
                        skb_pull(skb, 1);
                }
        } else {
                if (!(skb->data[0] & LAPB_S)) {
                        /*
                         * I frame - carries NR/NS/PF
                         */
                        frame->type = LAPB_I;
                        frame->ns   = (skb->data[0] >> 1) & 0x07;
                        frame->nr   = (skb->data[0] >> 5) & 0x07;
                        frame->pf   = skb->data[0] & LAPB_SPF;
                } else if ((skb->data[0] & LAPB_U) == 1) {
                        /*
                         * S frame - take out PF/NR
                         */
                        frame->type = skb->data[0] & 0x0F;
                        frame->nr   = (skb->data[0] >> 5) & 0x07;
                        frame->pf   = skb->data[0] & LAPB_SPF;
                } else if ((skb->data[0] & LAPB_U) == 3) {
                        /*
                         * U frame - take out PF
                         */
                        frame->type = skb->data[0] & ~LAPB_SPF;
                        frame->pf   = skb->data[0] & LAPB_SPF;
                }
 
                frame->control[0] = skb->data[0];
 
                skb_pull(skb, 1);
        }
 
        return 0;
}
 
/*
 *      This routine is called when the HDLC layer internally  generates a
 *      command or  response  for  the remote machine ( eg. RR, UA etc. ).
 *      Only supervisory or unnumbered frames are processed, FRMRs are handled
 *      by lapb_transmit_frmr below.
 */
void lapb_send_control(struct lapb_cb *lapb, int frametype,
                       int poll_bit, int type)
{
        struct sk_buff *skb;
        unsigned char  *dptr;
 
        if ((skb = alloc_skb(LAPB_HEADER_LEN + 3, GFP_ATOMIC)) == NULL)
                return;
 
        skb_reserve(skb, LAPB_HEADER_LEN + 1);
 
        if (lapb->mode & LAPB_EXTENDED) {
                if ((frametype & LAPB_U) == LAPB_U) {
                        dptr   = skb_put(skb, 1);
                        *dptr  = frametype;
                        *dptr |= poll_bit ? LAPB_SPF : 0;
                } else {
                        dptr     = skb_put(skb, 2);
                        dptr[0]  = frametype;
                        dptr[1]  = (lapb->vr << 1);
                        dptr[1] |= poll_bit ? LAPB_EPF : 0;
                }
        } else {
                dptr   = skb_put(skb, 1);
                *dptr  = frametype;
                *dptr |= poll_bit ? LAPB_SPF : 0;
                if ((frametype & LAPB_U) == LAPB_S)     /* S frames carry NR */
                        *dptr |= (lapb->vr << 5);
        }
 
        lapb_transmit_buffer(lapb, skb, type);
}
 
/*
 *      This routine generates FRMRs based on information previously stored in
 *      the LAPB control block.
 */
void lapb_transmit_frmr(struct lapb_cb *lapb)
{
        struct sk_buff *skb;
        unsigned char  *dptr;
 
        if ((skb = alloc_skb(LAPB_HEADER_LEN + 7, GFP_ATOMIC)) == NULL)
                return;
 
        skb_reserve(skb, LAPB_HEADER_LEN + 1);
 
        if (lapb->mode & LAPB_EXTENDED) {
                dptr    = skb_put(skb, 6);
                *dptr++ = LAPB_FRMR;
                *dptr++ = lapb->frmr_data.control[0];
                *dptr++ = lapb->frmr_data.control[1];
                *dptr++ = (lapb->vs << 1) & 0xFE;
                *dptr   = (lapb->vr << 1) & 0xFE;
                if (lapb->frmr_data.cr == LAPB_RESPONSE)
                        *dptr |= 0x01;
                dptr++;
                *dptr++ = lapb->frmr_type;
 
#if LAPB_DEBUG > 1
        printk(KERN_DEBUG "lapb: (%p) S%d TX FRMR %02X %02X %02X %02X %02X\n",
               lapb->dev, lapb->state,
               skb->data[1], skb->data[2], skb->data[3],
               skb->data[4], skb->data[5]);
#endif
        } else {
                dptr    = skb_put(skb, 4);
                *dptr++ = LAPB_FRMR;
                *dptr++ = lapb->frmr_data.control[0];
                *dptr   = (lapb->vs << 1) & 0x0E;
                *dptr  |= (lapb->vr << 5) & 0xE0;
                if (lapb->frmr_data.cr == LAPB_RESPONSE)
                        *dptr |= 0x10;
                dptr++;
                *dptr++ = lapb->frmr_type;
 
#if LAPB_DEBUG > 1
        printk(KERN_DEBUG "lapb: (%p) S%d TX FRMR %02X %02X %02X\n",
               lapb->dev, lapb->state, skb->data[1],
               skb->data[2], skb->data[3]);
#endif
        }
 
        lapb_transmit_buffer(lapb, skb, LAPB_RESPONSE);
}

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Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [net/] [lapb/] [lapb_subr.c] - Blame information for rev 17

Line No.	Rev	Author	Line
1	3	xianfeng	`/*`
2			`* LAPB release 002`
3			`*`
4			`* This code REQUIRES 2.1.15 or higher/ NET3.038`
5			`*`
6			`* This module:`
7			`* This module is free software; you can redistribute it and/or`
8			`* modify it under the terms of the GNU General Public License`
9			`* as published by the Free Software Foundation; either version`
10			`* 2 of the License, or (at your option) any later version.`
11			`*`
12			`* History`
13			`* LAPB 001 Jonathan Naylor Started Coding`
14			`*/`
15
16			`#include <linux/errno.h>`
17			`#include <linux/types.h>`
18			`#include <linux/socket.h>`
19			`#include <linux/in.h>`
20			`#include <linux/kernel.h>`
21			`#include <linux/timer.h>`
22			`#include <linux/string.h>`
23			`#include <linux/sockios.h>`
24			`#include <linux/net.h>`
25			`#include <linux/inet.h>`
26			`#include <linux/skbuff.h>`
27			`#include <net/sock.h>`
28			`#include <asm/uaccess.h>`
29			`#include <asm/system.h>`
30			`#include <linux/fcntl.h>`
31			`#include <linux/mm.h>`
32			`#include <linux/interrupt.h>`
33			`#include <net/lapb.h>`
34
35			`/*`
36			`* This routine purges all the queues of frames.`
37			`*/`
38			`void lapb_clear_queues(struct lapb_cb *lapb)`
39			`{`
40			`skb_queue_purge(&lapb->write_queue);`
41			`skb_queue_purge(&lapb->ack_queue);`
42			`}`
43
44			`/*`
45			`* This routine purges the input queue of those frames that have been`
46			`* acknowledged. This replaces the boxes labelled "V(a) <- N(r)" on the`
47			`* SDL diagram.`
48			`*/`
49			`void lapb_frames_acked(struct lapb_cb *lapb, unsigned short nr)`
50			`{`
51			`struct sk_buff *skb;`
52			`int modulus;`
53
54			`modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : LAPB_SMODULUS;`
55
56			`/*`
57			`* Remove all the ack-ed frames from the ack queue.`
58			`*/`
59			`if (lapb->va != nr)`
60			`while (skb_peek(&lapb->ack_queue) && lapb->va != nr) {`
61			`skb = skb_dequeue(&lapb->ack_queue);`
62			`kfree_skb(skb);`
63			`lapb->va = (lapb->va + 1) % modulus;`
64			`}`
65			`}`
66
67			`void lapb_requeue_frames(struct lapb_cb *lapb)`
68			`{`
69			`struct sk_buff skb, skb_prev = NULL;`
70
71			`/*`
72			`* Requeue all the un-ack-ed frames on the output queue to be picked`
73			`* up by lapb_kick called from the timer. This arrangement handles the`
74			`* possibility of an empty output queue.`
75			`*/`
76			`while ((skb = skb_dequeue(&lapb->ack_queue)) != NULL) {`
77			`if (!skb_prev)`
78			`skb_queue_head(&lapb->write_queue, skb);`
79			`else`
80			`skb_append(skb_prev, skb, &lapb->write_queue);`
81			`skb_prev = skb;`
82			`}`
83			`}`
84
85			`/*`
86			`* Validate that the value of nr is between va and vs. Return true or`
87			`* false for testing.`
88			`*/`
89			`int lapb_validate_nr(struct lapb_cb *lapb, unsigned short nr)`
90			`{`
91			`unsigned short vc = lapb->va;`
92			`int modulus;`
93
94			`modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : LAPB_SMODULUS;`
95
96			`while (vc != lapb->vs) {`
97			`if (nr == vc)`
98			`return 1;`
99			`vc = (vc + 1) % modulus;`
100			`}`
101
102			`return nr == lapb->vs;`
103			`}`
104
105			`/*`
106			`* This routine is the centralised routine for parsing the control`
107			`* information for the different frame formats.`
108			`*/`
109			`int lapb_decode(struct lapb_cb lapb, struct sk_buff skb,`
110			`struct lapb_frame *frame)`
111			`{`
112			`frame->type = LAPB_ILLEGAL;`
113
114			`#if LAPB_DEBUG > 2`
115			`printk(KERN_DEBUG "lapb: (%p) S%d RX %02X %02X %02X\n",`
116			`lapb->dev, lapb->state,`
117			`skb->data[0], skb->data[1], skb->data[2]);`
118			`#endif`
119
120			`/* We always need to look at 2 bytes, sometimes we need`
121			`* to look at 3 and those cases are handled below.`
122			`*/`
123			`if (!pskb_may_pull(skb, 2))`
124			`return -1;`
125
126			`if (lapb->mode & LAPB_MLP) {`
127			`if (lapb->mode & LAPB_DCE) {`
128			`if (skb->data[0] == LAPB_ADDR_D)`
129			`frame->cr = LAPB_COMMAND;`
130			`if (skb->data[0] == LAPB_ADDR_C)`
131			`frame->cr = LAPB_RESPONSE;`
132			`} else {`
133			`if (skb->data[0] == LAPB_ADDR_C)`
134			`frame->cr = LAPB_COMMAND;`
135			`if (skb->data[0] == LAPB_ADDR_D)`
136			`frame->cr = LAPB_RESPONSE;`
137			`}`
138			`} else {`
139			`if (lapb->mode & LAPB_DCE) {`
140			`if (skb->data[0] == LAPB_ADDR_B)`
141			`frame->cr = LAPB_COMMAND;`
142			`if (skb->data[0] == LAPB_ADDR_A)`
143			`frame->cr = LAPB_RESPONSE;`
144			`} else {`
145			`if (skb->data[0] == LAPB_ADDR_A)`
146			`frame->cr = LAPB_COMMAND;`
147			`if (skb->data[0] == LAPB_ADDR_B)`
148			`frame->cr = LAPB_RESPONSE;`
149			`}`
150			`}`
151
152			`skb_pull(skb, 1);`
153
154			`if (lapb->mode & LAPB_EXTENDED) {`
155			`if (!(skb->data[0] & LAPB_S)) {`
156			`if (!pskb_may_pull(skb, 2))`
157			`return -1;`
158			`/*`
159			`* I frame - carries NR/NS/PF`
160			`*/`
161			`frame->type = LAPB_I;`
162			`frame->ns = (skb->data[0] >> 1) & 0x7F;`
163			`frame->nr = (skb->data[1] >> 1) & 0x7F;`
164			`frame->pf = skb->data[1] & LAPB_EPF;`
165			`frame->control[0] = skb->data[0];`
166			`frame->control[1] = skb->data[1];`
167			`skb_pull(skb, 2);`
168			`} else if ((skb->data[0] & LAPB_U) == 1) {`
169			`if (!pskb_may_pull(skb, 2))`
170			`return -1;`
171			`/*`
172			`* S frame - take out PF/NR`
173			`*/`
174			`frame->type = skb->data[0] & 0x0F;`
175			`frame->nr = (skb->data[1] >> 1) & 0x7F;`
176			`frame->pf = skb->data[1] & LAPB_EPF;`
177			`frame->control[0] = skb->data[0];`
178			`frame->control[1] = skb->data[1];`
179			`skb_pull(skb, 2);`
180			`} else if ((skb->data[0] & LAPB_U) == 3) {`
181			`/*`
182			`* U frame - take out PF`
183			`*/`
184			`frame->type = skb->data[0] & ~LAPB_SPF;`
185			`frame->pf = skb->data[0] & LAPB_SPF;`
186			`frame->control[0] = skb->data[0];`
187			`frame->control[1] = 0x00;`
188			`skb_pull(skb, 1);`
189			`}`
190			`} else {`
191			`if (!(skb->data[0] & LAPB_S)) {`
192			`/*`
193			`* I frame - carries NR/NS/PF`
194			`*/`
195			`frame->type = LAPB_I;`
196			`frame->ns = (skb->data[0] >> 1) & 0x07;`
197			`frame->nr = (skb->data[0] >> 5) & 0x07;`
198			`frame->pf = skb->data[0] & LAPB_SPF;`
199			`} else if ((skb->data[0] & LAPB_U) == 1) {`
200			`/*`
201			`* S frame - take out PF/NR`
202			`*/`
203			`frame->type = skb->data[0] & 0x0F;`
204			`frame->nr = (skb->data[0] >> 5) & 0x07;`
205			`frame->pf = skb->data[0] & LAPB_SPF;`
206			`} else if ((skb->data[0] & LAPB_U) == 3) {`
207			`/*`
208			`* U frame - take out PF`
209			`*/`
210			`frame->type = skb->data[0] & ~LAPB_SPF;`
211			`frame->pf = skb->data[0] & LAPB_SPF;`
212			`}`
213
214			`frame->control[0] = skb->data[0];`
215
216			`skb_pull(skb, 1);`
217			`}`
218
219			`return 0;`
220			`}`
221
222			`/*`
223			`* This routine is called when the HDLC layer internally generates a`
224			`* command or response for the remote machine ( eg. RR, UA etc. ).`
225			`* Only supervisory or unnumbered frames are processed, FRMRs are handled`
226			`* by lapb_transmit_frmr below.`
227			`*/`
228			`void lapb_send_control(struct lapb_cb *lapb, int frametype,`
229			`int poll_bit, int type)`
230			`{`
231			`struct sk_buff *skb;`
232			`unsigned char *dptr;`
233
234			`if ((skb = alloc_skb(LAPB_HEADER_LEN + 3, GFP_ATOMIC)) == NULL)`
235			`return;`
236
237			`skb_reserve(skb, LAPB_HEADER_LEN + 1);`
238
239			`if (lapb->mode & LAPB_EXTENDED) {`
240			`if ((frametype & LAPB_U) == LAPB_U) {`
241			`dptr = skb_put(skb, 1);`
242			`*dptr = frametype;`
243			`*dptr \|= poll_bit ? LAPB_SPF : 0;`
244			`} else {`
245			`dptr = skb_put(skb, 2);`
246			`dptr[0] = frametype;`
247			`dptr[1] = (lapb->vr << 1);`
248			`dptr[1] \|= poll_bit ? LAPB_EPF : 0;`
249			`}`
250			`} else {`
251			`dptr = skb_put(skb, 1);`
252			`*dptr = frametype;`
253			`*dptr \|= poll_bit ? LAPB_SPF : 0;`
254			`if ((frametype & LAPB_U) == LAPB_S) /* S frames carry NR */`
255			`*dptr \|= (lapb->vr << 5);`
256			`}`
257
258			`lapb_transmit_buffer(lapb, skb, type);`
259			`}`
260
261			`/*`
262			`* This routine generates FRMRs based on information previously stored in`
263			`* the LAPB control block.`
264			`*/`
265			`void lapb_transmit_frmr(struct lapb_cb *lapb)`
266			`{`
267			`struct sk_buff *skb;`
268			`unsigned char *dptr;`
269
270			`if ((skb = alloc_skb(LAPB_HEADER_LEN + 7, GFP_ATOMIC)) == NULL)`
271			`return;`
272
273			`skb_reserve(skb, LAPB_HEADER_LEN + 1);`
274
275			`if (lapb->mode & LAPB_EXTENDED) {`
276			`dptr = skb_put(skb, 6);`
277			`*dptr++ = LAPB_FRMR;`
278			`*dptr++ = lapb->frmr_data.control[0];`
279			`*dptr++ = lapb->frmr_data.control[1];`
280			`*dptr++ = (lapb->vs << 1) & 0xFE;`
281			`*dptr = (lapb->vr << 1) & 0xFE;`
282			`if (lapb->frmr_data.cr == LAPB_RESPONSE)`
283			`*dptr \|= 0x01;`
284			`dptr++;`
285			`*dptr++ = lapb->frmr_type;`
286
287			`#if LAPB_DEBUG > 1`
288			`printk(KERN_DEBUG "lapb: (%p) S%d TX FRMR %02X %02X %02X %02X %02X\n",`
289			`lapb->dev, lapb->state,`
290			`skb->data[1], skb->data[2], skb->data[3],`
291			`skb->data[4], skb->data[5]);`
292			`#endif`
293			`} else {`
294			`dptr = skb_put(skb, 4);`
295			`*dptr++ = LAPB_FRMR;`
296			`*dptr++ = lapb->frmr_data.control[0];`
297			`*dptr = (lapb->vs << 1) & 0x0E;`
298			`*dptr \|= (lapb->vr << 5) & 0xE0;`
299			`if (lapb->frmr_data.cr == LAPB_RESPONSE)`
300			`*dptr \|= 0x10;`
301			`dptr++;`
302			`*dptr++ = lapb->frmr_type;`
303
304			`#if LAPB_DEBUG > 1`
305			`printk(KERN_DEBUG "lapb: (%p) S%d TX FRMR %02X %02X %02X\n",`
306			`lapb->dev, lapb->state, skb->data[1],`
307			`skb->data[2], skb->data[3]);`
308			`#endif`
309			`}`
310
311			`lapb_transmit_buffer(lapb, skb, LAPB_RESPONSE);`
312			`}`