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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [net/] [ax25/] [ax25_timer.c] - Blame information for rev 1629

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/*
 *      AX.25 release 035
 *
 *      This code REQUIRES 1.2.1 or higher/ NET3.029
 *
 *      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
 *      AX.25 028a      Jonathan(G4KLX) New state machine based on SDL diagrams.
 *      AX.25 028b      Jonathan(G4KLX) Extracted AX25 control block from the
 *                                      sock structure.
 *      AX.25 029       Alan(GW4PTS)    Switched to KA9Q constant names.
 *      AX.25 031       Joerg(DL1BKE)   Added DAMA support
 *      AX.25 032       Joerg(DL1BKE)   Fixed DAMA timeout bug
 *      AX.25 033       Jonathan(G4KLX) Modularisation functions.
 *      AX.25 035       Frederic(F1OAT) Support for pseudo-digipeating.
 */
 
#include <linux/config.h>
#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <asm/segment.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
 
static void ax25_timer(unsigned long);
 
/*
 *      Linux set timer
 */
void ax25_set_timer(ax25_cb *ax25)
{
        unsigned long flags;
 
        save_flags(flags); cli();
        del_timer(&ax25->timer);
        restore_flags(flags);
 
        ax25->timer.data     = (unsigned long)ax25;
        ax25->timer.function = &ax25_timer;
        ax25->timer.expires  = jiffies + 10;
 
        add_timer(&ax25->timer);
}
 
/*
 *      AX.25 TIMER
 *
 *      This routine is called every 100ms. Decrement timer by this
 *      amount - if expired then process the event.
 */
static void ax25_timer(unsigned long param)
{
        ax25_cb *ax25 = (ax25_cb *)param;
 
        switch (ax25->state) {
                case AX25_STATE_0:
                        /* Magic here: If we listen() and a new link dies before it
                           is accepted() it isn't 'dead' so doesn't get removed. */
                        if (ax25->sk == NULL || ax25->sk->destroy || (ax25->sk->state == TCP_LISTEN && ax25->sk->dead)) {
                                ax25_destroy_socket(ax25);
                                return;
                        }
                        break;
 
                case AX25_STATE_3:
                case AX25_STATE_4:
                        /*
                         * Check the state of the receive buffer.
                         */
                        if (ax25->sk != NULL) {
                                if (ax25->sk->rmem_alloc < (ax25->sk->rcvbuf / 2) && (ax25->condition & AX25_COND_OWN_RX_BUSY)) {
                                        ax25->condition &= ~AX25_COND_OWN_RX_BUSY;
                                        ax25->condition &= ~AX25_COND_ACK_PENDING;
                                        if (!ax25->dama_slave)
                                                ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE);
                                        break;
                                }
                        }
                        /*
                         * Check for frames to transmit.
                         */
                        if (!ax25->dama_slave)
                                ax25_kick(ax25);
                        break;
 
                default:
                        break;
        }
 
        if (ax25->t2timer > 0 && --ax25->t2timer == 0) {
                if (ax25->state == AX25_STATE_3 || ax25->state == AX25_STATE_4) {
                        if (ax25->condition & AX25_COND_ACK_PENDING) {
                                ax25->condition &= ~AX25_COND_ACK_PENDING;
                                if (!ax25->dama_slave)
                                        ax25_timeout_response(ax25);
                        }
                }
        }
 
        if (ax25->t3timer > 0 && --ax25->t3timer == 0) {
                /* dl1bke 960114: T3 expires and we are in DAMA mode:  */
                /*                send a DISC and abort the connection */
                if (ax25->dama_slave) {
                        ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
                        ax25_disconnect(ax25, ETIMEDOUT);
                        ax25_set_timer(ax25);
                        return;
                }
 
                if (ax25->state == AX25_STATE_3) {
                        ax25->n2count = 0;
                        ax25_transmit_enquiry(ax25);
                        ax25->state   = AX25_STATE_4;
                }
 
                ax25->t3timer = ax25->t3;
        }
 
        if (ax25->idletimer > 0 && --ax25->idletimer == 0) {
                /* dl1bke 960228: close the connection when IDLE expires */
                /*                similar to DAMA T3 timeout but with    */
                /*                a "clean" disconnect of the connection */
 
                ax25_clear_queues(ax25);
 
                ax25->n2count = 0;
                if (!ax25->dama_slave) {
                        ax25->t3timer = 0;
                        ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
                } else {
                        ax25->t3timer = ax25->t3;
                }
 
                /* state 1 or 2 should not happen, but... */
 
                if (ax25->state == AX25_STATE_1 || ax25->state == AX25_STATE_2)
                        ax25->state = AX25_STATE_0;
                else
                        ax25->state = AX25_STATE_2;
 
                ax25->t1timer = ax25->t1 = ax25_calculate_t1(ax25);
                ax25->t2timer = 0;
 
                if (ax25->sk != NULL) {
                        ax25->sk->state     = TCP_CLOSE;
                        ax25->sk->err       = 0;
                        ax25->sk->shutdown |= SEND_SHUTDOWN;
                        if (!ax25->sk->dead)
                                ax25->sk->state_change(ax25->sk);
                        ax25->sk->dead      = 1;
                }
        }
 
        /* dl1bke 960114: DAMA T1 timeouts are handled in ax25_dama_slave_transmit */
        /*                nevertheless we have to re-enqueue the timer struct...   */
        if (ax25->t1timer == 0 || --ax25->t1timer > 0) {
                ax25_set_timer(ax25);
                return;
        }
 
        if (!ax25_dev_is_dama_slave(ax25->device)) {
                if (ax25->dama_slave)
                        ax25->dama_slave = 0;
                ax25_t1_timeout(ax25);
        }
}
 
 
/* dl1bke 960114: The DAMA protocol requires to send data and SABM/DISC
 *                within the poll of any connected channel. Remember
 *                that we are not allowed to send anything unless we
 *                get polled by the Master.
 *
 *                Thus we'll have to do parts of our T1 handling in
 *                ax25_enquiry_response().
 */
void ax25_t1_timeout(ax25_cb *ax25)
{
        switch (ax25->state) {
                case AX25_STATE_1:
                        if (ax25->n2count == ax25->n2) {
                                if (ax25->modulus == AX25_MODULUS) {
                                        ax25_disconnect(ax25, ETIMEDOUT);
                                } else {
                                        ax25->modulus = AX25_MODULUS;
                                        ax25->window  = ax25_dev_get_value(ax25->device, AX25_VALUES_WINDOW);
                                        ax25->n2count = 0;
                                        ax25_send_control(ax25, AX25_SABM, ax25_dev_is_dama_slave(ax25->device) ? AX25_POLLOFF : AX25_POLLON, AX25_COMMAND);
                                }
                        } else {
                                ax25->n2count++;
                                if (ax25->modulus == AX25_MODULUS)
                                        ax25_send_control(ax25, AX25_SABM, ax25_dev_is_dama_slave(ax25->device) ? AX25_POLLOFF : AX25_POLLON, AX25_COMMAND);
                                else
                                        ax25_send_control(ax25, AX25_SABME, ax25_dev_is_dama_slave(ax25->device) ? AX25_POLLOFF : AX25_POLLON, AX25_COMMAND);
                        }
                        break;
 
                case AX25_STATE_2:
                        if (ax25->n2count == ax25->n2) {
                                ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
                                ax25_disconnect(ax25, ETIMEDOUT);
                        } else {
                                ax25->n2count++;
                                if (!ax25_dev_is_dama_slave(ax25->device))
                                        ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
                        }
                        break;
 
                case AX25_STATE_3:
                        ax25->n2count = 1;
                        if (!ax25->dama_slave)
                                ax25_transmit_enquiry(ax25);
                        ax25->state   = AX25_STATE_4;
                        break;
 
                case AX25_STATE_4:
                        if (ax25->n2count == ax25->n2) {
                                ax25_send_control(ax25, AX25_DM, AX25_POLLON, AX25_RESPONSE);
                                ax25_disconnect(ax25, ETIMEDOUT);
                        } else {
                                ax25->n2count++;
                                if (!ax25->dama_slave)
                                        ax25_transmit_enquiry(ax25);
                        }
                        break;
        }
 
        ax25->t1timer = ax25->t1 = ax25_calculate_t1(ax25);
 
        ax25_set_timer(ax25);
}
 
/************************************************************************/
/*      Module support functions follow.                                */
/************************************************************************/
 
static struct protocol_struct {
        struct protocol_struct *next;
        unsigned int pid;
        int (*func)(struct sk_buff *, ax25_cb *);
} *protocol_list = NULL;
 
static struct linkfail_struct {
        struct linkfail_struct *next;
        void (*func)(ax25_cb *, int);
} *linkfail_list = NULL;
 
static struct listen_struct {
        struct listen_struct *next;
        ax25_address  callsign;
        struct device *dev;
} *listen_list = NULL;
 
int ax25_protocol_register(unsigned int pid, int (*func)(struct sk_buff *, ax25_cb *))
{
        struct protocol_struct *protocol;
        unsigned long flags;
 
        if (pid == AX25_P_TEXT || pid == AX25_P_SEGMENT)
                return 0;
#ifdef CONFIG_INET
        if (pid == AX25_P_IP || pid == AX25_P_ARP)
                return 0;
#endif
        if ((protocol = (struct protocol_struct *)kmalloc(sizeof(*protocol), GFP_ATOMIC)) == NULL)
                return 0;
 
        protocol->pid  = pid;
        protocol->func = func;
 
        save_flags(flags);
        cli();
 
        protocol->next = protocol_list;
        protocol_list  = protocol;
 
        restore_flags(flags);
 
        return 1;
}
 
void ax25_protocol_release(unsigned int pid)
{
        struct protocol_struct *s, *protocol = protocol_list;
        unsigned long flags;
 
        if (protocol == NULL)
                return;
 
        save_flags(flags);
        cli();
 
        if (protocol->pid == pid) {
                protocol_list = protocol->next;
                restore_flags(flags);
                kfree_s(protocol, sizeof(struct protocol_struct));
                return;
        }
 
        while (protocol != NULL && protocol->next != NULL) {
                if (protocol->next->pid == pid) {
                        s = protocol->next;
                        protocol->next = protocol->next->next;
                        restore_flags(flags);
                        kfree_s(s, sizeof(struct protocol_struct));
                        return;
                }
 
                protocol = protocol->next;
        }
 
        restore_flags(flags);
}
 
int ax25_linkfail_register(void (*func)(ax25_cb *, int))
{
        struct linkfail_struct *linkfail;
        unsigned long flags;
 
        if ((linkfail = (struct linkfail_struct *)kmalloc(sizeof(*linkfail), GFP_ATOMIC)) == NULL)
                return 0;
 
        linkfail->func = func;
 
        save_flags(flags);
        cli();
 
        linkfail->next = linkfail_list;
        linkfail_list  = linkfail;
 
        restore_flags(flags);
 
        return 1;
}
 
void ax25_linkfail_release(void (*func)(ax25_cb *, int))
{
        struct linkfail_struct *s, *linkfail = linkfail_list;
        unsigned long flags;
 
        if (linkfail == NULL)
                return;
 
        save_flags(flags);
        cli();
 
        if (linkfail->func == func) {
                linkfail_list = linkfail->next;
                restore_flags(flags);
                kfree_s(linkfail, sizeof(struct linkfail_struct));
                return;
        }
 
        while (linkfail != NULL && linkfail->next != NULL) {
                if (linkfail->next->func == func) {
                        s = linkfail->next;
                        linkfail->next = linkfail->next->next;
                        restore_flags(flags);
                        kfree_s(s, sizeof(struct linkfail_struct));
                        return;
                }
 
                linkfail = linkfail->next;
        }
 
        restore_flags(flags);
}
 
int ax25_listen_register(ax25_address *callsign, struct device *dev)
{
        struct listen_struct *listen;
        unsigned long flags;
 
        if (ax25_listen_mine(callsign, dev))
                return 0;
 
        if ((listen = (struct listen_struct *)kmalloc(sizeof(*listen), GFP_ATOMIC)) == NULL)
                return 0;
 
        listen->callsign = *callsign;
        listen->dev      = dev;
 
        save_flags(flags);
        cli();
 
        listen->next = listen_list;
        listen_list  = listen;
 
        restore_flags(flags);
 
        return 1;
}
 
void ax25_listen_release(ax25_address *callsign, struct device *dev)
{
        struct listen_struct *s, *listen = listen_list;
        unsigned long flags;
 
        if (listen == NULL)
                return;
 
        save_flags(flags);
        cli();
 
        if (ax25cmp(&listen->callsign, callsign) == 0 && listen->dev == dev) {
                listen_list = listen->next;
                restore_flags(flags);
                kfree_s(listen, sizeof(struct listen_struct));
                return;
        }
 
        while (listen != NULL && listen->next != NULL) {
                if (ax25cmp(&listen->next->callsign, callsign) == 0 && listen->next->dev == dev) {
                        s = listen->next;
                        listen->next = listen->next->next;
                        restore_flags(flags);
                        kfree_s(s, sizeof(struct listen_struct));
                        return;
                }
 
                listen = listen->next;
        }
 
        restore_flags(flags);
}
 
int (*ax25_protocol_function(unsigned int pid))(struct sk_buff *, ax25_cb *)
{
        struct protocol_struct *protocol;
 
        for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
                if (protocol->pid == pid)
                        return protocol->func;
 
        return NULL;
}
 
int ax25_listen_mine(ax25_address *callsign, struct device *dev)
{
        struct listen_struct *listen;
 
        for (listen = listen_list; listen != NULL; listen = listen->next)
                if (ax25cmp(&listen->callsign, callsign) == 0 && (listen->dev == dev || listen->dev == NULL))
                        return 1;
 
        return 0;
}
 
void ax25_link_failed(ax25_cb *ax25, int reason)
{
        struct linkfail_struct *linkfail;
 
        for (linkfail = linkfail_list; linkfail != NULL; linkfail = linkfail->next)
                (linkfail->func)(ax25, reason);
}
 
int ax25_protocol_is_registered(unsigned int pid)
{
        struct protocol_struct *protocol;
 
        for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
                if (protocol->pid == pid)
                        return 1;
 
        return 0;
}
 
#endif

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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [net/] [ax25/] [ax25_timer.c] - Blame information for rev 1629

Line No.	Rev	Author	Line
1	1629	jcastillo	`/*`
2			`* AX.25 release 035`
3			`*`
4			`* This code REQUIRES 1.2.1 or higher/ NET3.029`
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			`* AX.25 028a Jonathan(G4KLX) New state machine based on SDL diagrams.`
14			`* AX.25 028b Jonathan(G4KLX) Extracted AX25 control block from the`
15			`* sock structure.`
16			`* AX.25 029 Alan(GW4PTS) Switched to KA9Q constant names.`
17			`* AX.25 031 Joerg(DL1BKE) Added DAMA support`
18			`* AX.25 032 Joerg(DL1BKE) Fixed DAMA timeout bug`
19			`* AX.25 033 Jonathan(G4KLX) Modularisation functions.`
20			`* AX.25 035 Frederic(F1OAT) Support for pseudo-digipeating.`
21			`*/`
22
23			`#include <linux/config.h>`
24			`#if defined(CONFIG_AX25) \|\| defined(CONFIG_AX25_MODULE)`
25			`#include <linux/errno.h>`
26			`#include <linux/types.h>`
27			`#include <linux/socket.h>`
28			`#include <linux/in.h>`
29			`#include <linux/kernel.h>`
30			`#include <linux/sched.h>`
31			`#include <linux/timer.h>`
32			`#include <linux/string.h>`
33			`#include <linux/sockios.h>`
34			`#include <linux/net.h>`
35			`#include <net/ax25.h>`
36			`#include <linux/inet.h>`
37			`#include <linux/netdevice.h>`
38			`#include <linux/skbuff.h>`
39			`#include <net/sock.h>`
40			`#include <asm/segment.h>`
41			`#include <asm/system.h>`
42			`#include <linux/fcntl.h>`
43			`#include <linux/mm.h>`
44			`#include <linux/interrupt.h>`
45
46			`static void ax25_timer(unsigned long);`
47
48			`/*`
49			`* Linux set timer`
50			`*/`
51			`void ax25_set_timer(ax25_cb *ax25)`
52			`{`
53			`unsigned long flags;`
54
55			`save_flags(flags); cli();`
56			`del_timer(&ax25->timer);`
57			`restore_flags(flags);`
58
59			`ax25->timer.data = (unsigned long)ax25;`
60			`ax25->timer.function = &ax25_timer;`
61			`ax25->timer.expires = jiffies + 10;`
62
63			`add_timer(&ax25->timer);`
64			`}`
65
66			`/*`
67			`* AX.25 TIMER`
68			`*`
69			`* This routine is called every 100ms. Decrement timer by this`
70			`* amount - if expired then process the event.`
71			`*/`
72			`static void ax25_timer(unsigned long param)`
73			`{`
74			`ax25_cb ax25 = (ax25_cb )param;`
75
76			`switch (ax25->state) {`
77			`case AX25_STATE_0:`
78			`/* Magic here: If we listen() and a new link dies before it`
79			`is accepted() it isn't 'dead' so doesn't get removed. */`
80			`if (ax25->sk == NULL \|\| ax25->sk->destroy \|\| (ax25->sk->state == TCP_LISTEN && ax25->sk->dead)) {`
81			`ax25_destroy_socket(ax25);`
82			`return;`
83			`}`
84			`break;`
85
86			`case AX25_STATE_3:`
87			`case AX25_STATE_4:`
88			`/*`
89			`* Check the state of the receive buffer.`
90			`*/`
91			`if (ax25->sk != NULL) {`
92			`if (ax25->sk->rmem_alloc < (ax25->sk->rcvbuf / 2) && (ax25->condition & AX25_COND_OWN_RX_BUSY)) {`
93			`ax25->condition &= ~AX25_COND_OWN_RX_BUSY;`
94			`ax25->condition &= ~AX25_COND_ACK_PENDING;`
95			`if (!ax25->dama_slave)`
96			`ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE);`
97			`break;`
98			`}`
99			`}`
100			`/*`
101			`* Check for frames to transmit.`
102			`*/`
103			`if (!ax25->dama_slave)`
104			`ax25_kick(ax25);`
105			`break;`
106
107			`default:`
108			`break;`
109			`}`
110
111			`if (ax25->t2timer > 0 && --ax25->t2timer == 0) {`
112			`if (ax25->state == AX25_STATE_3 \|\| ax25->state == AX25_STATE_4) {`
113			`if (ax25->condition & AX25_COND_ACK_PENDING) {`
114			`ax25->condition &= ~AX25_COND_ACK_PENDING;`
115			`if (!ax25->dama_slave)`
116			`ax25_timeout_response(ax25);`
117			`}`
118			`}`
119			`}`
120
121			`if (ax25->t3timer > 0 && --ax25->t3timer == 0) {`
122			`/* dl1bke 960114: T3 expires and we are in DAMA mode: */`
123			`/* send a DISC and abort the connection */`
124			`if (ax25->dama_slave) {`
125			`ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);`
126			`ax25_disconnect(ax25, ETIMEDOUT);`
127			`ax25_set_timer(ax25);`
128			`return;`
129			`}`
130
131			`if (ax25->state == AX25_STATE_3) {`
132			`ax25->n2count = 0;`
133			`ax25_transmit_enquiry(ax25);`
134			`ax25->state = AX25_STATE_4;`
135			`}`
136
137			`ax25->t3timer = ax25->t3;`
138			`}`
139
140			`if (ax25->idletimer > 0 && --ax25->idletimer == 0) {`
141			`/* dl1bke 960228: close the connection when IDLE expires */`
142			`/* similar to DAMA T3 timeout but with */`
143			`/* a "clean" disconnect of the connection */`
144
145			`ax25_clear_queues(ax25);`
146
147			`ax25->n2count = 0;`
148			`if (!ax25->dama_slave) {`
149			`ax25->t3timer = 0;`
150			`ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);`
151			`} else {`
152			`ax25->t3timer = ax25->t3;`
153			`}`
154
155			`/* state 1 or 2 should not happen, but... */`
156
157			`if (ax25->state == AX25_STATE_1 \|\| ax25->state == AX25_STATE_2)`
158			`ax25->state = AX25_STATE_0;`
159			`else`
160			`ax25->state = AX25_STATE_2;`
161
162			`ax25->t1timer = ax25->t1 = ax25_calculate_t1(ax25);`
163			`ax25->t2timer = 0;`
164
165			`if (ax25->sk != NULL) {`
166			`ax25->sk->state = TCP_CLOSE;`
167			`ax25->sk->err = 0;`
168			`ax25->sk->shutdown \|= SEND_SHUTDOWN;`
169			`if (!ax25->sk->dead)`
170			`ax25->sk->state_change(ax25->sk);`
171			`ax25->sk->dead = 1;`
172			`}`
173			`}`
174
175			`/* dl1bke 960114: DAMA T1 timeouts are handled in ax25_dama_slave_transmit */`
176			`/* nevertheless we have to re-enqueue the timer struct... */`
177			`if (ax25->t1timer == 0 \|\| --ax25->t1timer > 0) {`
178			`ax25_set_timer(ax25);`
179			`return;`
180			`}`
181
182			`if (!ax25_dev_is_dama_slave(ax25->device)) {`
183			`if (ax25->dama_slave)`
184			`ax25->dama_slave = 0;`
185			`ax25_t1_timeout(ax25);`
186			`}`
187			`}`
188
189
190			`/* dl1bke 960114: The DAMA protocol requires to send data and SABM/DISC`
191			`* within the poll of any connected channel. Remember`
192			`* that we are not allowed to send anything unless we`
193			`* get polled by the Master.`
194			`*`
195			`* Thus we'll have to do parts of our T1 handling in`
196			`* ax25_enquiry_response().`
197			`*/`
198			`void ax25_t1_timeout(ax25_cb *ax25)`
199			`{`
200			`switch (ax25->state) {`
201			`case AX25_STATE_1:`
202			`if (ax25->n2count == ax25->n2) {`
203			`if (ax25->modulus == AX25_MODULUS) {`
204			`ax25_disconnect(ax25, ETIMEDOUT);`
205			`} else {`
206			`ax25->modulus = AX25_MODULUS;`
207			`ax25->window = ax25_dev_get_value(ax25->device, AX25_VALUES_WINDOW);`
208			`ax25->n2count = 0;`
209			`ax25_send_control(ax25, AX25_SABM, ax25_dev_is_dama_slave(ax25->device) ? AX25_POLLOFF : AX25_POLLON, AX25_COMMAND);`
210			`}`
211			`} else {`
212			`ax25->n2count++;`
213			`if (ax25->modulus == AX25_MODULUS)`
214			`ax25_send_control(ax25, AX25_SABM, ax25_dev_is_dama_slave(ax25->device) ? AX25_POLLOFF : AX25_POLLON, AX25_COMMAND);`
215			`else`
216			`ax25_send_control(ax25, AX25_SABME, ax25_dev_is_dama_slave(ax25->device) ? AX25_POLLOFF : AX25_POLLON, AX25_COMMAND);`
217			`}`
218			`break;`
219
220			`case AX25_STATE_2:`
221			`if (ax25->n2count == ax25->n2) {`
222			`ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);`
223			`ax25_disconnect(ax25, ETIMEDOUT);`
224			`} else {`
225			`ax25->n2count++;`
226			`if (!ax25_dev_is_dama_slave(ax25->device))`
227			`ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);`
228			`}`
229			`break;`
230
231			`case AX25_STATE_3:`
232			`ax25->n2count = 1;`
233			`if (!ax25->dama_slave)`
234			`ax25_transmit_enquiry(ax25);`
235			`ax25->state = AX25_STATE_4;`
236			`break;`
237
238			`case AX25_STATE_4:`
239			`if (ax25->n2count == ax25->n2) {`
240			`ax25_send_control(ax25, AX25_DM, AX25_POLLON, AX25_RESPONSE);`
241			`ax25_disconnect(ax25, ETIMEDOUT);`
242			`} else {`
243			`ax25->n2count++;`
244			`if (!ax25->dama_slave)`
245			`ax25_transmit_enquiry(ax25);`
246			`}`
247			`break;`
248			`}`
249
250			`ax25->t1timer = ax25->t1 = ax25_calculate_t1(ax25);`
251
252			`ax25_set_timer(ax25);`
253			`}`
254
255			`/************************************************************************/`
256			`/* Module support functions follow. */`
257			`/************************************************************************/`
258
259			`static struct protocol_struct {`
260			`struct protocol_struct *next;`
261			`unsigned int pid;`
262			`int (func)(struct sk_buff , ax25_cb *);`
263			`} *protocol_list = NULL;`
264
265			`static struct linkfail_struct {`
266			`struct linkfail_struct *next;`
267			`void (func)(ax25_cb , int);`
268			`} *linkfail_list = NULL;`
269
270			`static struct listen_struct {`
271			`struct listen_struct *next;`
272			`ax25_address callsign;`
273			`struct device *dev;`
274			`} *listen_list = NULL;`
275
276			`int ax25_protocol_register(unsigned int pid, int (func)(struct sk_buff , ax25_cb *))`
277			`{`
278			`struct protocol_struct *protocol;`
279			`unsigned long flags;`
280
281			`if (pid == AX25_P_TEXT \|\| pid == AX25_P_SEGMENT)`
282			`return 0;`
283			`#ifdef CONFIG_INET`
284			`if (pid == AX25_P_IP \|\| pid == AX25_P_ARP)`
285			`return 0;`
286			`#endif`
287			`if ((protocol = (struct protocol_struct )kmalloc(sizeof(protocol), GFP_ATOMIC)) == NULL)`
288			`return 0;`
289
290			`protocol->pid = pid;`
291			`protocol->func = func;`
292
293			`save_flags(flags);`
294			`cli();`
295
296			`protocol->next = protocol_list;`
297			`protocol_list = protocol;`
298
299			`restore_flags(flags);`
300
301			`return 1;`
302			`}`
303
304			`void ax25_protocol_release(unsigned int pid)`
305			`{`
306			`struct protocol_struct s, protocol = protocol_list;`
307			`unsigned long flags;`
308
309			`if (protocol == NULL)`
310			`return;`
311
312			`save_flags(flags);`
313			`cli();`
314
315			`if (protocol->pid == pid) {`
316			`protocol_list = protocol->next;`
317			`restore_flags(flags);`
318			`kfree_s(protocol, sizeof(struct protocol_struct));`
319			`return;`
320			`}`
321
322			`while (protocol != NULL && protocol->next != NULL) {`
323			`if (protocol->next->pid == pid) {`
324			`s = protocol->next;`
325			`protocol->next = protocol->next->next;`
326			`restore_flags(flags);`
327			`kfree_s(s, sizeof(struct protocol_struct));`
328			`return;`
329			`}`
330
331			`protocol = protocol->next;`
332			`}`
333
334			`restore_flags(flags);`
335			`}`
336
337			`int ax25_linkfail_register(void (func)(ax25_cb , int))`
338			`{`
339			`struct linkfail_struct *linkfail;`
340			`unsigned long flags;`
341
342			`if ((linkfail = (struct linkfail_struct )kmalloc(sizeof(linkfail), GFP_ATOMIC)) == NULL)`
343			`return 0;`
344
345			`linkfail->func = func;`
346
347			`save_flags(flags);`
348			`cli();`
349
350			`linkfail->next = linkfail_list;`
351			`linkfail_list = linkfail;`
352
353			`restore_flags(flags);`
354
355			`return 1;`
356			`}`
357
358			`void ax25_linkfail_release(void (func)(ax25_cb , int))`
359			`{`
360			`struct linkfail_struct s, linkfail = linkfail_list;`
361			`unsigned long flags;`
362
363			`if (linkfail == NULL)`
364			`return;`
365
366			`save_flags(flags);`
367			`cli();`
368
369			`if (linkfail->func == func) {`
370			`linkfail_list = linkfail->next;`
371			`restore_flags(flags);`
372			`kfree_s(linkfail, sizeof(struct linkfail_struct));`
373			`return;`
374			`}`
375
376			`while (linkfail != NULL && linkfail->next != NULL) {`
377			`if (linkfail->next->func == func) {`
378			`s = linkfail->next;`
379			`linkfail->next = linkfail->next->next;`
380			`restore_flags(flags);`
381			`kfree_s(s, sizeof(struct linkfail_struct));`
382			`return;`
383			`}`
384
385			`linkfail = linkfail->next;`
386			`}`
387
388			`restore_flags(flags);`
389			`}`
390
391			`int ax25_listen_register(ax25_address callsign, struct device dev)`
392			`{`
393			`struct listen_struct *listen;`
394			`unsigned long flags;`
395
396			`if (ax25_listen_mine(callsign, dev))`
397			`return 0;`
398
399			`if ((listen = (struct listen_struct )kmalloc(sizeof(listen), GFP_ATOMIC)) == NULL)`
400			`return 0;`
401
402			`listen->callsign = *callsign;`
403			`listen->dev = dev;`
404
405			`save_flags(flags);`
406			`cli();`
407
408			`listen->next = listen_list;`
409			`listen_list = listen;`
410
411			`restore_flags(flags);`
412
413			`return 1;`
414			`}`
415
416			`void ax25_listen_release(ax25_address callsign, struct device dev)`
417			`{`
418			`struct listen_struct s, listen = listen_list;`
419			`unsigned long flags;`
420
421			`if (listen == NULL)`
422			`return;`
423
424			`save_flags(flags);`
425			`cli();`
426
427			`if (ax25cmp(&listen->callsign, callsign) == 0 && listen->dev == dev) {`
428			`listen_list = listen->next;`
429			`restore_flags(flags);`
430			`kfree_s(listen, sizeof(struct listen_struct));`
431			`return;`
432			`}`
433
434			`while (listen != NULL && listen->next != NULL) {`
435			`if (ax25cmp(&listen->next->callsign, callsign) == 0 && listen->next->dev == dev) {`
436			`s = listen->next;`
437			`listen->next = listen->next->next;`
438			`restore_flags(flags);`
439			`kfree_s(s, sizeof(struct listen_struct));`
440			`return;`
441			`}`
442
443			`listen = listen->next;`
444			`}`
445
446			`restore_flags(flags);`
447			`}`
448
449			`int (ax25_protocol_function(unsigned int pid))(struct sk_buff , ax25_cb *)`
450			`{`
451			`struct protocol_struct *protocol;`
452
453			`for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)`
454			`if (protocol->pid == pid)`
455			`return protocol->func;`
456
457			`return NULL;`
458			`}`
459
460			`int ax25_listen_mine(ax25_address callsign, struct device dev)`
461			`{`
462			`struct listen_struct *listen;`
463
464			`for (listen = listen_list; listen != NULL; listen = listen->next)`
465			`if (ax25cmp(&listen->callsign, callsign) == 0 && (listen->dev == dev \|\| listen->dev == NULL))`
466			`return 1;`
467
468			`return 0;`
469			`}`
470
471			`void ax25_link_failed(ax25_cb *ax25, int reason)`
472			`{`
473			`struct linkfail_struct *linkfail;`
474
475			`for (linkfail = linkfail_list; linkfail != NULL; linkfail = linkfail->next)`
476			`(linkfail->func)(ax25, reason);`
477			`}`
478
479			`int ax25_protocol_is_registered(unsigned int pid)`
480			`{`
481			`struct protocol_struct *protocol;`
482
483			`for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)`
484			`if (protocol->pid == pid)`
485			`return 1;`
486
487			`return 0;`
488			`}`
489
490			`#endif`