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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [net/] [rose/] [rose_in.c] - Blame information for rev 1765

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/*
 *      ROSE release 003
 *
 *      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.
 *
 *      Most of this code is based on the SDL diagrams published in the 7th
 *      ARRL Computer Networking Conference papers. The diagrams have mistakes
 *      in them, but are mostly correct. Before you modify the code could you
 *      read the SDL diagrams as the code is not obvious and probably very
 *      easy to break;
 *
 *      History
 *      ROSE 001        Jonathan(G4KLX) Cloned from nr_in.c
 *      ROSE 002        Jonathan(G4KLX) Return cause and diagnostic codes from Clear Requests.
 *      ROSE 003        Jonathan(G4KLX) New timer architecture.
 *                                      Removed M bit processing.
 */
 
#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 <net/ip.h>                     /* For ip_rcv */
#include <asm/segment.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <net/rose.h>
 
/*
 * State machine for state 1, Awaiting Call Accepted State.
 * The handling of the timer(s) is in file rose_timer.c.
 * Handling of state 0 and connection release is in af_rose.c.
 */
static int rose_state1_machine(struct sock *sk, struct sk_buff *skb, int frametype)
{
        switch (frametype) {
 
                case ROSE_CALL_ACCEPTED:
                        rose_stop_timer(sk);
                        rose_start_idletimer(sk);
                        sk->protinfo.rose->condition = 0x00;
                        sk->protinfo.rose->vs        = 0;
                        sk->protinfo.rose->va        = 0;
                        sk->protinfo.rose->vr        = 0;
                        sk->protinfo.rose->vl        = 0;
                        sk->protinfo.rose->state     = ROSE_STATE_3;
                        sk->state                    = TCP_ESTABLISHED;
                        if (!sk->dead)
                                sk->state_change(sk);
                        break;
 
                case ROSE_CLEAR_REQUEST:
                        rose_write_internal(sk, ROSE_CLEAR_CONFIRMATION);
                        rose_disconnect(sk, ECONNREFUSED, skb->data[3], skb->data[4]);
                        sk->protinfo.rose->neighbour->use--;
                        break;
 
                default:
                        break;
        }
 
        return 0;
}
 
/*
 * State machine for state 2, Awaiting Clear Confirmation State.
 * The handling of the timer(s) is in file rose_timer.c
 * Handling of state 0 and connection release is in af_rose.c.
 */
static int rose_state2_machine(struct sock *sk, struct sk_buff *skb, int frametype)
{
        switch (frametype) {
 
                case ROSE_CLEAR_REQUEST:
                        rose_write_internal(sk, ROSE_CLEAR_CONFIRMATION);
                        rose_disconnect(sk, 0, skb->data[3], skb->data[4]);
                        sk->protinfo.rose->neighbour->use--;
                        break;
 
                case ROSE_CLEAR_CONFIRMATION:
                        rose_disconnect(sk, 0, -1, -1);
                        sk->protinfo.rose->neighbour->use--;
                        break;
 
                default:
                        break;
        }
 
        return 0;
}
 
/*
 * State machine for state 3, Connected State.
 * The handling of the timer(s) is in file rose_timer.c
 * Handling of state 0 and connection release is in af_rose.c.
 */
static int rose_state3_machine(struct sock *sk, struct sk_buff *skb, int frametype, int ns, int nr, int q, int d, int m)
{
        int queued = 0;
 
        switch (frametype) {
 
                case ROSE_RESET_REQUEST:
                        rose_stop_timer(sk);
                        rose_start_idletimer(sk);
                        rose_write_internal(sk, ROSE_RESET_CONFIRMATION);
                        sk->protinfo.rose->condition = 0x00;
                        sk->protinfo.rose->vs        = 0;
                        sk->protinfo.rose->vr        = 0;
                        sk->protinfo.rose->va        = 0;
                        sk->protinfo.rose->vl        = 0;
                        rose_requeue_frames(sk);
                        break;
 
                case ROSE_CLEAR_REQUEST:
                        rose_write_internal(sk, ROSE_CLEAR_CONFIRMATION);
                        rose_disconnect(sk, 0, skb->data[3], skb->data[4]);
                        sk->protinfo.rose->neighbour->use--;
                        break;
 
                case ROSE_RR:
                case ROSE_RNR:
                        if (!rose_validate_nr(sk, nr)) {
                                rose_write_internal(sk, ROSE_RESET_REQUEST);
                                sk->protinfo.rose->condition = 0x00;
                                sk->protinfo.rose->vs        = 0;
                                sk->protinfo.rose->vr        = 0;
                                sk->protinfo.rose->va        = 0;
                                sk->protinfo.rose->vl        = 0;
                                sk->protinfo.rose->state     = ROSE_STATE_4;
                                rose_start_t2timer(sk);
                                rose_stop_idletimer(sk);
                        } else {
                                rose_frames_acked(sk, nr);
                                if (frametype == ROSE_RNR) {
                                        sk->protinfo.rose->condition |= ROSE_COND_PEER_RX_BUSY;
                                } else {
                                        sk->protinfo.rose->condition &= ~ROSE_COND_PEER_RX_BUSY;
                                }
                        }
                        break;
 
                case ROSE_DATA: /* XXX */
                        sk->protinfo.rose->condition &= ~ROSE_COND_PEER_RX_BUSY;
                        if (!rose_validate_nr(sk, nr)) {
                                rose_write_internal(sk, ROSE_RESET_REQUEST);
                                sk->protinfo.rose->condition = 0x00;
                                sk->protinfo.rose->vs        = 0;
                                sk->protinfo.rose->vr        = 0;
                                sk->protinfo.rose->va        = 0;
                                sk->protinfo.rose->vl        = 0;
                                sk->protinfo.rose->state     = ROSE_STATE_4;
                                rose_start_t2timer(sk);
                                rose_stop_idletimer(sk);
                                break;
                        }
                        rose_frames_acked(sk, nr);
                        if (ns == sk->protinfo.rose->vr) {
                                rose_start_idletimer(sk);
                                if (sock_queue_rcv_skb(sk, skb) == 0) {
                                        sk->protinfo.rose->vr = (sk->protinfo.rose->vr + 1) % ROSE_MODULUS;
                                        queued = 1;
                                } else {
                                        /* Should never happen ! */
                                        rose_write_internal(sk, ROSE_RESET_REQUEST);
                                        sk->protinfo.rose->condition = 0x00;
                                        sk->protinfo.rose->vs        = 0;
                                        sk->protinfo.rose->vr        = 0;
                                        sk->protinfo.rose->va        = 0;
                                        sk->protinfo.rose->vl        = 0;
                                        sk->protinfo.rose->state     = ROSE_STATE_4;
                                        rose_start_t2timer(sk);
                                        rose_stop_idletimer(sk);
                                        break;
                                }
                                if (atomic_read(&sk->rmem_alloc) > (sk->rcvbuf / 2))
                                        sk->protinfo.rose->condition |= ROSE_COND_OWN_RX_BUSY;
                        }
                        /*
                         * If the window is full, ack the frame, else start the
                         * acknowledge hold back timer.
                         */
                        if (((sk->protinfo.rose->vl + sysctl_rose_window_size) % ROSE_MODULUS) == sk->protinfo.rose->vr) {
                                sk->protinfo.rose->condition &= ~ROSE_COND_ACK_PENDING;
                                rose_stop_timer(sk);
                                rose_enquiry_response(sk);
                        } else {
                                sk->protinfo.rose->condition |= ROSE_COND_ACK_PENDING;
                                rose_start_hbtimer(sk);
                        }
                        break;
 
                default:
                        printk(KERN_WARNING "ROSE: unknown %02X in state 3\n", frametype);
                        break;
        }
 
        return queued;
}
 
/*
 * State machine for state 4, Awaiting Reset Confirmation State.
 * The handling of the timer(s) is in file rose_timer.c
 * Handling of state 0 and connection release is in af_rose.c.
 */
static int rose_state4_machine(struct sock *sk, struct sk_buff *skb, int frametype)
{
        switch (frametype) {
 
                case ROSE_RESET_REQUEST:
                        rose_write_internal(sk, ROSE_RESET_CONFIRMATION);
                case ROSE_RESET_CONFIRMATION:
                        rose_stop_timer(sk);
                        rose_start_idletimer(sk);
                        sk->protinfo.rose->condition = 0x00;
                        sk->protinfo.rose->va        = 0;
                        sk->protinfo.rose->vr        = 0;
                        sk->protinfo.rose->vs        = 0;
                        sk->protinfo.rose->vl        = 0;
                        sk->protinfo.rose->state     = ROSE_STATE_3;
                        rose_requeue_frames(sk);
                        break;
 
                case ROSE_CLEAR_REQUEST:
                        rose_write_internal(sk, ROSE_CLEAR_CONFIRMATION);
                        rose_disconnect(sk, 0, skb->data[3], skb->data[4]);
                        sk->protinfo.rose->neighbour->use--;
                        break;
 
                default:
                        break;
        }
 
        return 0;
}
 
/*
 * State machine for state 5, Awaiting Call Acceptance State.
 * The handling of the timer(s) is in file rose_timer.c
 * Handling of state 0 and connection release is in af_rose.c.
 */
static int rose_state5_machine(struct sock *sk, struct sk_buff *skb, int frametype)
{
        if (frametype == ROSE_CLEAR_REQUEST) {
                rose_write_internal(sk, ROSE_CLEAR_CONFIRMATION);
                rose_disconnect(sk, 0, skb->data[3], skb->data[4]);
                sk->protinfo.rose->neighbour->use--;
        }
 
        return 0;
}
 
/* Higher level upcall for a LAPB frame */
int rose_process_rx_frame(struct sock *sk, struct sk_buff *skb)
{
        int queued = 0, frametype, ns, nr, q, d, m;
 
        if (sk->protinfo.rose->state == ROSE_STATE_0)
                return 0;
 
        frametype = rose_decode(skb, &ns, &nr, &q, &d, &m);
 
        switch (sk->protinfo.rose->state) {
                case ROSE_STATE_1:
                        queued = rose_state1_machine(sk, skb, frametype);
                        break;
                case ROSE_STATE_2:
                        queued = rose_state2_machine(sk, skb, frametype);
                        break;
                case ROSE_STATE_3:
                        queued = rose_state3_machine(sk, skb, frametype, ns, nr, q, d, m);
                        break;
                case ROSE_STATE_4:
                        queued = rose_state4_machine(sk, skb, frametype);
                        break;
                case ROSE_STATE_5:
                        queued = rose_state5_machine(sk, skb, frametype);
                        break;
        }
 
        rose_kick(sk);
 
        return queued;
}

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [net/] [rose/] [rose_in.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* ROSE release 003`
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			`* Most of this code is based on the SDL diagrams published in the 7th`
13			`* ARRL Computer Networking Conference papers. The diagrams have mistakes`
14			`* in them, but are mostly correct. Before you modify the code could you`
15			`* read the SDL diagrams as the code is not obvious and probably very`
16			`* easy to break;`
17			`*`
18			`* History`
19			`* ROSE 001 Jonathan(G4KLX) Cloned from nr_in.c`
20			`* ROSE 002 Jonathan(G4KLX) Return cause and diagnostic codes from Clear Requests.`
21			`* ROSE 003 Jonathan(G4KLX) New timer architecture.`
22			`* Removed M bit processing.`
23			`*/`
24
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 <net/ip.h> /* For ip_rcv */`
41			`#include <asm/segment.h>`
42			`#include <asm/system.h>`
43			`#include <linux/fcntl.h>`
44			`#include <linux/mm.h>`
45			`#include <linux/interrupt.h>`
46			`#include <net/rose.h>`
47
48			`/*`
49			`* State machine for state 1, Awaiting Call Accepted State.`
50			`* The handling of the timer(s) is in file rose_timer.c.`
51			`* Handling of state 0 and connection release is in af_rose.c.`
52			`*/`
53			`static int rose_state1_machine(struct sock sk, struct sk_buff skb, int frametype)`
54			`{`
55			`switch (frametype) {`
56
57			`case ROSE_CALL_ACCEPTED:`
58			`rose_stop_timer(sk);`
59			`rose_start_idletimer(sk);`
60			`sk->protinfo.rose->condition = 0x00;`
61			`sk->protinfo.rose->vs = 0;`
62			`sk->protinfo.rose->va = 0;`
63			`sk->protinfo.rose->vr = 0;`
64			`sk->protinfo.rose->vl = 0;`
65			`sk->protinfo.rose->state = ROSE_STATE_3;`
66			`sk->state = TCP_ESTABLISHED;`
67			`if (!sk->dead)`
68			`sk->state_change(sk);`
69			`break;`
70
71			`case ROSE_CLEAR_REQUEST:`
72			`rose_write_internal(sk, ROSE_CLEAR_CONFIRMATION);`
73			`rose_disconnect(sk, ECONNREFUSED, skb->data[3], skb->data[4]);`
74			`sk->protinfo.rose->neighbour->use--;`
75			`break;`
76
77			`default:`
78			`break;`
79			`}`
80
81			`return 0;`
82			`}`
83
84			`/*`
85			`* State machine for state 2, Awaiting Clear Confirmation State.`
86			`* The handling of the timer(s) is in file rose_timer.c`
87			`* Handling of state 0 and connection release is in af_rose.c.`
88			`*/`
89			`static int rose_state2_machine(struct sock sk, struct sk_buff skb, int frametype)`
90			`{`
91			`switch (frametype) {`
92
93			`case ROSE_CLEAR_REQUEST:`
94			`rose_write_internal(sk, ROSE_CLEAR_CONFIRMATION);`
95			`rose_disconnect(sk, 0, skb->data[3], skb->data[4]);`
96			`sk->protinfo.rose->neighbour->use--;`
97			`break;`
98
99			`case ROSE_CLEAR_CONFIRMATION:`
100			`rose_disconnect(sk, 0, -1, -1);`
101			`sk->protinfo.rose->neighbour->use--;`
102			`break;`
103
104			`default:`
105			`break;`
106			`}`
107
108			`return 0;`
109			`}`
110
111			`/*`
112			`* State machine for state 3, Connected State.`
113			`* The handling of the timer(s) is in file rose_timer.c`
114			`* Handling of state 0 and connection release is in af_rose.c.`
115			`*/`
116			`static int rose_state3_machine(struct sock sk, struct sk_buff skb, int frametype, int ns, int nr, int q, int d, int m)`
117			`{`
118			`int queued = 0;`
119
120			`switch (frametype) {`
121
122			`case ROSE_RESET_REQUEST:`
123			`rose_stop_timer(sk);`
124			`rose_start_idletimer(sk);`
125			`rose_write_internal(sk, ROSE_RESET_CONFIRMATION);`
126			`sk->protinfo.rose->condition = 0x00;`
127			`sk->protinfo.rose->vs = 0;`
128			`sk->protinfo.rose->vr = 0;`
129			`sk->protinfo.rose->va = 0;`
130			`sk->protinfo.rose->vl = 0;`
131			`rose_requeue_frames(sk);`
132			`break;`
133
134			`case ROSE_CLEAR_REQUEST:`
135			`rose_write_internal(sk, ROSE_CLEAR_CONFIRMATION);`
136			`rose_disconnect(sk, 0, skb->data[3], skb->data[4]);`
137			`sk->protinfo.rose->neighbour->use--;`
138			`break;`
139
140			`case ROSE_RR:`
141			`case ROSE_RNR:`
142			`if (!rose_validate_nr(sk, nr)) {`
143			`rose_write_internal(sk, ROSE_RESET_REQUEST);`
144			`sk->protinfo.rose->condition = 0x00;`
145			`sk->protinfo.rose->vs = 0;`
146			`sk->protinfo.rose->vr = 0;`
147			`sk->protinfo.rose->va = 0;`
148			`sk->protinfo.rose->vl = 0;`
149			`sk->protinfo.rose->state = ROSE_STATE_4;`
150			`rose_start_t2timer(sk);`
151			`rose_stop_idletimer(sk);`
152			`} else {`
153			`rose_frames_acked(sk, nr);`
154			`if (frametype == ROSE_RNR) {`
155			`sk->protinfo.rose->condition \|= ROSE_COND_PEER_RX_BUSY;`
156			`} else {`
157			`sk->protinfo.rose->condition &= ~ROSE_COND_PEER_RX_BUSY;`
158			`}`
159			`}`
160			`break;`
161
162			`case ROSE_DATA: /* XXX */`
163			`sk->protinfo.rose->condition &= ~ROSE_COND_PEER_RX_BUSY;`
164			`if (!rose_validate_nr(sk, nr)) {`
165			`rose_write_internal(sk, ROSE_RESET_REQUEST);`
166			`sk->protinfo.rose->condition = 0x00;`
167			`sk->protinfo.rose->vs = 0;`
168			`sk->protinfo.rose->vr = 0;`
169			`sk->protinfo.rose->va = 0;`
170			`sk->protinfo.rose->vl = 0;`
171			`sk->protinfo.rose->state = ROSE_STATE_4;`
172			`rose_start_t2timer(sk);`
173			`rose_stop_idletimer(sk);`
174			`break;`
175			`}`
176			`rose_frames_acked(sk, nr);`
177			`if (ns == sk->protinfo.rose->vr) {`
178			`rose_start_idletimer(sk);`
179			`if (sock_queue_rcv_skb(sk, skb) == 0) {`
180			`sk->protinfo.rose->vr = (sk->protinfo.rose->vr + 1) % ROSE_MODULUS;`
181			`queued = 1;`
182			`} else {`
183			`/* Should never happen ! */`
184			`rose_write_internal(sk, ROSE_RESET_REQUEST);`
185			`sk->protinfo.rose->condition = 0x00;`
186			`sk->protinfo.rose->vs = 0;`
187			`sk->protinfo.rose->vr = 0;`
188			`sk->protinfo.rose->va = 0;`
189			`sk->protinfo.rose->vl = 0;`
190			`sk->protinfo.rose->state = ROSE_STATE_4;`
191			`rose_start_t2timer(sk);`
192			`rose_stop_idletimer(sk);`
193			`break;`
194			`}`
195			`if (atomic_read(&sk->rmem_alloc) > (sk->rcvbuf / 2))`
196			`sk->protinfo.rose->condition \|= ROSE_COND_OWN_RX_BUSY;`
197			`}`
198			`/*`
199			`* If the window is full, ack the frame, else start the`
200			`* acknowledge hold back timer.`
201			`*/`
202			`if (((sk->protinfo.rose->vl + sysctl_rose_window_size) % ROSE_MODULUS) == sk->protinfo.rose->vr) {`
203			`sk->protinfo.rose->condition &= ~ROSE_COND_ACK_PENDING;`
204			`rose_stop_timer(sk);`
205			`rose_enquiry_response(sk);`
206			`} else {`
207			`sk->protinfo.rose->condition \|= ROSE_COND_ACK_PENDING;`
208			`rose_start_hbtimer(sk);`
209			`}`
210			`break;`
211
212			`default:`
213			`printk(KERN_WARNING "ROSE: unknown %02X in state 3\n", frametype);`
214			`break;`
215			`}`
216
217			`return queued;`
218			`}`
219
220			`/*`
221			`* State machine for state 4, Awaiting Reset Confirmation State.`
222			`* The handling of the timer(s) is in file rose_timer.c`
223			`* Handling of state 0 and connection release is in af_rose.c.`
224			`*/`
225			`static int rose_state4_machine(struct sock sk, struct sk_buff skb, int frametype)`
226			`{`
227			`switch (frametype) {`
228
229			`case ROSE_RESET_REQUEST:`
230			`rose_write_internal(sk, ROSE_RESET_CONFIRMATION);`
231			`case ROSE_RESET_CONFIRMATION:`
232			`rose_stop_timer(sk);`
233			`rose_start_idletimer(sk);`
234			`sk->protinfo.rose->condition = 0x00;`
235			`sk->protinfo.rose->va = 0;`
236			`sk->protinfo.rose->vr = 0;`
237			`sk->protinfo.rose->vs = 0;`
238			`sk->protinfo.rose->vl = 0;`
239			`sk->protinfo.rose->state = ROSE_STATE_3;`
240			`rose_requeue_frames(sk);`
241			`break;`
242
243			`case ROSE_CLEAR_REQUEST:`
244			`rose_write_internal(sk, ROSE_CLEAR_CONFIRMATION);`
245			`rose_disconnect(sk, 0, skb->data[3], skb->data[4]);`
246			`sk->protinfo.rose->neighbour->use--;`
247			`break;`
248
249			`default:`
250			`break;`
251			`}`
252
253			`return 0;`
254			`}`
255
256			`/*`
257			`* State machine for state 5, Awaiting Call Acceptance State.`
258			`* The handling of the timer(s) is in file rose_timer.c`
259			`* Handling of state 0 and connection release is in af_rose.c.`
260			`*/`
261			`static int rose_state5_machine(struct sock sk, struct sk_buff skb, int frametype)`
262			`{`
263			`if (frametype == ROSE_CLEAR_REQUEST) {`
264			`rose_write_internal(sk, ROSE_CLEAR_CONFIRMATION);`
265			`rose_disconnect(sk, 0, skb->data[3], skb->data[4]);`
266			`sk->protinfo.rose->neighbour->use--;`
267			`}`
268
269			`return 0;`
270			`}`
271
272			`/* Higher level upcall for a LAPB frame */`
273			`int rose_process_rx_frame(struct sock sk, struct sk_buff skb)`
274			`{`
275			`int queued = 0, frametype, ns, nr, q, d, m;`
276
277			`if (sk->protinfo.rose->state == ROSE_STATE_0)`
278			`return 0;`
279
280			`frametype = rose_decode(skb, &ns, &nr, &q, &d, &m);`
281
282			`switch (sk->protinfo.rose->state) {`
283			`case ROSE_STATE_1:`
284			`queued = rose_state1_machine(sk, skb, frametype);`
285			`break;`
286			`case ROSE_STATE_2:`
287			`queued = rose_state2_machine(sk, skb, frametype);`
288			`break;`
289			`case ROSE_STATE_3:`
290			`queued = rose_state3_machine(sk, skb, frametype, ns, nr, q, d, m);`
291			`break;`
292			`case ROSE_STATE_4:`
293			`queued = rose_state4_machine(sk, skb, frametype);`
294			`break;`
295			`case ROSE_STATE_5:`
296			`queued = rose_state5_machine(sk, skb, frametype);`
297			`break;`
298			`}`
299
300			`rose_kick(sk);`
301
302			`return queued;`
303			`}`