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

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/*
 *      NET/ROM release 007
 *
 *      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
 *      NET/ROM 001     Jonathan(G4KLX) Cloned from ax25_out.c
 *      NET/ROM 003     Jonathan(G4KLX) Added NET/ROM fragmentation.
 *                      Darryl(G7LED)   Fixed NAK, to give out correct reponse.
 *      NET/ROM 007     Jonathan(G4KLX) New timer architecture.
 */
 
#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/uaccess.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <net/netrom.h>
 
/*
 *      This is where all NET/ROM frames pass, except for IP-over-NET/ROM which
 *      cannot be fragmented in this manner.
 */
void nr_output(struct sock *sk, struct sk_buff *skb)
{
        struct sk_buff *skbn;
        unsigned char transport[NR_TRANSPORT_LEN];
        int err, frontlen, len;
 
        if (skb->len - NR_TRANSPORT_LEN > NR_MAX_PACKET_SIZE) {
                /* Save a copy of the Transport Header */
                memcpy(transport, skb->data, NR_TRANSPORT_LEN);
                skb_pull(skb, NR_TRANSPORT_LEN);
 
                frontlen = skb_headroom(skb);
 
                while (skb->len > 0) {
                        if ((skbn = sock_alloc_send_skb(sk, frontlen + NR_MAX_PACKET_SIZE, 0, &err)) == NULL)
                                return;
 
                        skb_reserve(skbn, frontlen);
 
                        len = (NR_MAX_PACKET_SIZE > skb->len) ? skb->len : NR_MAX_PACKET_SIZE;
 
                        /* Copy the user data */
                        memcpy(skb_put(skbn, len), skb->data, len);
                        skb_pull(skb, len);
 
                        /* Duplicate the Transport Header */
                        skb_push(skbn, NR_TRANSPORT_LEN);
                        memcpy(skbn->data, transport, NR_TRANSPORT_LEN);
 
                        if (skb->len > 0)
                                skbn->data[4] |= NR_MORE_FLAG;
 
                        skb_queue_tail(&sk->write_queue, skbn); /* Throw it on the queue */
                }
 
                kfree_skb(skb);
        } else {
                skb_queue_tail(&sk->write_queue, skb);          /* Throw it on the queue */
        }
 
        nr_kick(sk);
}
 
/*
 *      This procedure is passed a buffer descriptor for an iframe. It builds
 *      the rest of the control part of the frame and then writes it out.
 */
static void nr_send_iframe(struct sock *sk, struct sk_buff *skb)
{
        if (skb == NULL)
                return;
 
        skb->data[2] = sk->protinfo.nr->vs;
        skb->data[3] = sk->protinfo.nr->vr;
 
        if (sk->protinfo.nr->condition & NR_COND_OWN_RX_BUSY)
                skb->data[4] |= NR_CHOKE_FLAG;
 
        nr_start_idletimer(sk);
 
        nr_transmit_buffer(sk, skb);
}
 
void nr_send_nak_frame(struct sock *sk)
{
        struct sk_buff *skb, *skbn;
 
        if ((skb = skb_peek(&sk->protinfo.nr->ack_queue)) == NULL)
                return;
 
        if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL)
                return;
 
        skbn->data[2] = sk->protinfo.nr->va;
        skbn->data[3] = sk->protinfo.nr->vr;
 
        if (sk->protinfo.nr->condition & NR_COND_OWN_RX_BUSY)
                skbn->data[4] |= NR_CHOKE_FLAG;
 
        nr_transmit_buffer(sk, skbn);
 
        sk->protinfo.nr->condition &= ~NR_COND_ACK_PENDING;
        sk->protinfo.nr->vl         = sk->protinfo.nr->vr;
 
        nr_stop_t1timer(sk);
}
 
void nr_kick(struct sock *sk)
{
        struct sk_buff *skb, *skbn;
        unsigned short start, end;
 
        if (sk->protinfo.nr->state != NR_STATE_3)
                return;
 
        if (sk->protinfo.nr->condition & NR_COND_PEER_RX_BUSY)
                return;
 
        if (skb_peek(&sk->write_queue) == NULL)
                return;
 
        start = (skb_peek(&sk->protinfo.nr->ack_queue) == NULL) ? sk->protinfo.nr->va : sk->protinfo.nr->vs;
        end   = (sk->protinfo.nr->va + sk->protinfo.nr->window) % NR_MODULUS;
 
        if (start == end)
                return;
 
        sk->protinfo.nr->vs = start;
 
        /*
         * Transmit data until either we're out of data to send or
         * the window is full.
         */
 
        /*
         * Dequeue the frame and copy it.
         */
        skb  = skb_dequeue(&sk->write_queue);
 
        do {
                if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
                        skb_queue_head(&sk->write_queue, skb);
                        break;
                }
 
                skb_set_owner_w(skbn, sk);
 
                /*
                 * Transmit the frame copy.
                 */
                nr_send_iframe(sk, skbn);
 
                sk->protinfo.nr->vs = (sk->protinfo.nr->vs + 1) % NR_MODULUS;
 
                /*
                 * Requeue the original data frame.
                 */
                skb_queue_tail(&sk->protinfo.nr->ack_queue, skb);
 
        } while (sk->protinfo.nr->vs != end && (skb = skb_dequeue(&sk->write_queue)) != NULL);
 
        sk->protinfo.nr->vl         = sk->protinfo.nr->vr;
        sk->protinfo.nr->condition &= ~NR_COND_ACK_PENDING;
 
        if (!nr_t1timer_running(sk))
                nr_start_t1timer(sk);
}
 
void nr_transmit_buffer(struct sock *sk, struct sk_buff *skb)
{
        unsigned char *dptr;
 
        /*
         *      Add the protocol byte and network header.
         */
        dptr = skb_push(skb, NR_NETWORK_LEN);
 
        memcpy(dptr, &sk->protinfo.nr->source_addr, AX25_ADDR_LEN);
        dptr[6] &= ~AX25_CBIT;
        dptr[6] &= ~AX25_EBIT;
        dptr[6] |= AX25_SSSID_SPARE;
        dptr += AX25_ADDR_LEN;
 
        memcpy(dptr, &sk->protinfo.nr->dest_addr, AX25_ADDR_LEN);
        dptr[6] &= ~AX25_CBIT;
        dptr[6] |= AX25_EBIT;
        dptr[6] |= AX25_SSSID_SPARE;
        dptr += AX25_ADDR_LEN;
 
        *dptr++ = sysctl_netrom_network_ttl_initialiser;
 
        if (!nr_route_frame(skb, NULL)) {
                kfree_skb(skb);
                nr_disconnect(sk, ENETUNREACH);
        }
}
 
/*
 * The following routines are taken from page 170 of the 7th ARRL Computer
 * Networking Conference paper, as is the whole state machine.
 */
 
void nr_establish_data_link(struct sock *sk)
{
        sk->protinfo.nr->condition = 0x00;
        sk->protinfo.nr->n2count   = 0;
 
        nr_write_internal(sk, NR_CONNREQ);
 
        nr_stop_t2timer(sk);
        nr_stop_t4timer(sk);
        nr_stop_idletimer(sk);
        nr_start_t1timer(sk);
}
 
/*
 * Never send a NAK when we are CHOKEd.
 */
void nr_enquiry_response(struct sock *sk)
{
        int frametype = NR_INFOACK;
 
        if (sk->protinfo.nr->condition & NR_COND_OWN_RX_BUSY) {
                frametype |= NR_CHOKE_FLAG;
        } else {
                if (skb_peek(&sk->protinfo.nr->reseq_queue) != NULL)
                        frametype |= NR_NAK_FLAG;
        }
 
        nr_write_internal(sk, frametype);
 
        sk->protinfo.nr->vl         = sk->protinfo.nr->vr;
        sk->protinfo.nr->condition &= ~NR_COND_ACK_PENDING;
}
 
void nr_check_iframes_acked(struct sock *sk, unsigned short nr)
{
        if (sk->protinfo.nr->vs == nr) {
                nr_frames_acked(sk, nr);
                nr_stop_t1timer(sk);
                sk->protinfo.nr->n2count = 0;
        } else {
                if (sk->protinfo.nr->va != nr) {
                        nr_frames_acked(sk, nr);
                        nr_start_t1timer(sk);
                }
        }
}

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

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* NET/ROM release 007`
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			`* NET/ROM 001 Jonathan(G4KLX) Cloned from ax25_out.c`
14			`* NET/ROM 003 Jonathan(G4KLX) Added NET/ROM fragmentation.`
15			`* Darryl(G7LED) Fixed NAK, to give out correct reponse.`
16			`* NET/ROM 007 Jonathan(G4KLX) New timer architecture.`
17			`*/`
18
19			`#include <linux/errno.h>`
20			`#include <linux/types.h>`
21			`#include <linux/socket.h>`
22			`#include <linux/in.h>`
23			`#include <linux/kernel.h>`
24			`#include <linux/sched.h>`
25			`#include <linux/timer.h>`
26			`#include <linux/string.h>`
27			`#include <linux/sockios.h>`
28			`#include <linux/net.h>`
29			`#include <net/ax25.h>`
30			`#include <linux/inet.h>`
31			`#include <linux/netdevice.h>`
32			`#include <linux/skbuff.h>`
33			`#include <net/sock.h>`
34			`#include <asm/uaccess.h>`
35			`#include <asm/system.h>`
36			`#include <linux/fcntl.h>`
37			`#include <linux/mm.h>`
38			`#include <linux/interrupt.h>`
39			`#include <net/netrom.h>`
40
41			`/*`
42			`* This is where all NET/ROM frames pass, except for IP-over-NET/ROM which`
43			`* cannot be fragmented in this manner.`
44			`*/`
45			`void nr_output(struct sock sk, struct sk_buff skb)`
46			`{`
47			`struct sk_buff *skbn;`
48			`unsigned char transport[NR_TRANSPORT_LEN];`
49			`int err, frontlen, len;`
50
51			`if (skb->len - NR_TRANSPORT_LEN > NR_MAX_PACKET_SIZE) {`
52			`/* Save a copy of the Transport Header */`
53			`memcpy(transport, skb->data, NR_TRANSPORT_LEN);`
54			`skb_pull(skb, NR_TRANSPORT_LEN);`
55
56			`frontlen = skb_headroom(skb);`
57
58			`while (skb->len > 0) {`
59			`if ((skbn = sock_alloc_send_skb(sk, frontlen + NR_MAX_PACKET_SIZE, 0, &err)) == NULL)`
60			`return;`
61
62			`skb_reserve(skbn, frontlen);`
63
64			`len = (NR_MAX_PACKET_SIZE > skb->len) ? skb->len : NR_MAX_PACKET_SIZE;`
65
66			`/* Copy the user data */`
67			`memcpy(skb_put(skbn, len), skb->data, len);`
68			`skb_pull(skb, len);`
69
70			`/* Duplicate the Transport Header */`
71			`skb_push(skbn, NR_TRANSPORT_LEN);`
72			`memcpy(skbn->data, transport, NR_TRANSPORT_LEN);`
73
74			`if (skb->len > 0)`
75			`skbn->data[4] \|= NR_MORE_FLAG;`
76
77			`skb_queue_tail(&sk->write_queue, skbn); /* Throw it on the queue */`
78			`}`
79
80			`kfree_skb(skb);`
81			`} else {`
82			`skb_queue_tail(&sk->write_queue, skb); /* Throw it on the queue */`
83			`}`
84
85			`nr_kick(sk);`
86			`}`
87
88			`/*`
89			`* This procedure is passed a buffer descriptor for an iframe. It builds`
90			`* the rest of the control part of the frame and then writes it out.`
91			`*/`
92			`static void nr_send_iframe(struct sock sk, struct sk_buff skb)`
93			`{`
94			`if (skb == NULL)`
95			`return;`
96
97			`skb->data[2] = sk->protinfo.nr->vs;`
98			`skb->data[3] = sk->protinfo.nr->vr;`
99
100			`if (sk->protinfo.nr->condition & NR_COND_OWN_RX_BUSY)`
101			`skb->data[4] \|= NR_CHOKE_FLAG;`
102
103			`nr_start_idletimer(sk);`
104
105			`nr_transmit_buffer(sk, skb);`
106			`}`
107
108			`void nr_send_nak_frame(struct sock *sk)`
109			`{`
110			`struct sk_buff skb, skbn;`
111
112			`if ((skb = skb_peek(&sk->protinfo.nr->ack_queue)) == NULL)`
113			`return;`
114
115			`if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL)`
116			`return;`
117
118			`skbn->data[2] = sk->protinfo.nr->va;`
119			`skbn->data[3] = sk->protinfo.nr->vr;`
120
121			`if (sk->protinfo.nr->condition & NR_COND_OWN_RX_BUSY)`
122			`skbn->data[4] \|= NR_CHOKE_FLAG;`
123
124			`nr_transmit_buffer(sk, skbn);`
125
126			`sk->protinfo.nr->condition &= ~NR_COND_ACK_PENDING;`
127			`sk->protinfo.nr->vl = sk->protinfo.nr->vr;`
128
129			`nr_stop_t1timer(sk);`
130			`}`
131
132			`void nr_kick(struct sock *sk)`
133			`{`
134			`struct sk_buff skb, skbn;`
135			`unsigned short start, end;`
136
137			`if (sk->protinfo.nr->state != NR_STATE_3)`
138			`return;`
139
140			`if (sk->protinfo.nr->condition & NR_COND_PEER_RX_BUSY)`
141			`return;`
142
143			`if (skb_peek(&sk->write_queue) == NULL)`
144			`return;`
145
146			`start = (skb_peek(&sk->protinfo.nr->ack_queue) == NULL) ? sk->protinfo.nr->va : sk->protinfo.nr->vs;`
147			`end = (sk->protinfo.nr->va + sk->protinfo.nr->window) % NR_MODULUS;`
148
149			`if (start == end)`
150			`return;`
151
152			`sk->protinfo.nr->vs = start;`
153
154			`/*`
155			`* Transmit data until either we're out of data to send or`
156			`* the window is full.`
157			`*/`
158
159			`/*`
160			`* Dequeue the frame and copy it.`
161			`*/`
162			`skb = skb_dequeue(&sk->write_queue);`
163
164			`do {`
165			`if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {`
166			`skb_queue_head(&sk->write_queue, skb);`
167			`break;`
168			`}`
169
170			`skb_set_owner_w(skbn, sk);`
171
172			`/*`
173			`* Transmit the frame copy.`
174			`*/`
175			`nr_send_iframe(sk, skbn);`
176
177			`sk->protinfo.nr->vs = (sk->protinfo.nr->vs + 1) % NR_MODULUS;`
178
179			`/*`
180			`* Requeue the original data frame.`
181			`*/`
182			`skb_queue_tail(&sk->protinfo.nr->ack_queue, skb);`
183
184			`} while (sk->protinfo.nr->vs != end && (skb = skb_dequeue(&sk->write_queue)) != NULL);`
185
186			`sk->protinfo.nr->vl = sk->protinfo.nr->vr;`
187			`sk->protinfo.nr->condition &= ~NR_COND_ACK_PENDING;`
188
189			`if (!nr_t1timer_running(sk))`
190			`nr_start_t1timer(sk);`
191			`}`
192
193			`void nr_transmit_buffer(struct sock sk, struct sk_buff skb)`
194			`{`
195			`unsigned char *dptr;`
196
197			`/*`
198			`* Add the protocol byte and network header.`
199			`*/`
200			`dptr = skb_push(skb, NR_NETWORK_LEN);`
201
202			`memcpy(dptr, &sk->protinfo.nr->source_addr, AX25_ADDR_LEN);`
203			`dptr[6] &= ~AX25_CBIT;`
204			`dptr[6] &= ~AX25_EBIT;`
205			`dptr[6] \|= AX25_SSSID_SPARE;`
206			`dptr += AX25_ADDR_LEN;`
207
208			`memcpy(dptr, &sk->protinfo.nr->dest_addr, AX25_ADDR_LEN);`
209			`dptr[6] &= ~AX25_CBIT;`
210			`dptr[6] \|= AX25_EBIT;`
211			`dptr[6] \|= AX25_SSSID_SPARE;`
212			`dptr += AX25_ADDR_LEN;`
213
214			`*dptr++ = sysctl_netrom_network_ttl_initialiser;`
215
216			`if (!nr_route_frame(skb, NULL)) {`
217			`kfree_skb(skb);`
218			`nr_disconnect(sk, ENETUNREACH);`
219			`}`
220			`}`
221
222			`/*`
223			`* The following routines are taken from page 170 of the 7th ARRL Computer`
224			`* Networking Conference paper, as is the whole state machine.`
225			`*/`
226
227			`void nr_establish_data_link(struct sock *sk)`
228			`{`
229			`sk->protinfo.nr->condition = 0x00;`
230			`sk->protinfo.nr->n2count = 0;`
231
232			`nr_write_internal(sk, NR_CONNREQ);`
233
234			`nr_stop_t2timer(sk);`
235			`nr_stop_t4timer(sk);`
236			`nr_stop_idletimer(sk);`
237			`nr_start_t1timer(sk);`
238			`}`
239
240			`/*`
241			`* Never send a NAK when we are CHOKEd.`
242			`*/`
243			`void nr_enquiry_response(struct sock *sk)`
244			`{`
245			`int frametype = NR_INFOACK;`
246
247			`if (sk->protinfo.nr->condition & NR_COND_OWN_RX_BUSY) {`
248			`frametype \|= NR_CHOKE_FLAG;`
249			`} else {`
250			`if (skb_peek(&sk->protinfo.nr->reseq_queue) != NULL)`
251			`frametype \|= NR_NAK_FLAG;`
252			`}`
253
254			`nr_write_internal(sk, frametype);`
255
256			`sk->protinfo.nr->vl = sk->protinfo.nr->vr;`
257			`sk->protinfo.nr->condition &= ~NR_COND_ACK_PENDING;`
258			`}`
259
260			`void nr_check_iframes_acked(struct sock *sk, unsigned short nr)`
261			`{`
262			`if (sk->protinfo.nr->vs == nr) {`
263			`nr_frames_acked(sk, nr);`
264			`nr_stop_t1timer(sk);`
265			`sk->protinfo.nr->n2count = 0;`
266			`} else {`
267			`if (sk->protinfo.nr->va != nr) {`
268			`nr_frames_acked(sk, nr);`
269			`nr_start_t1timer(sk);`
270			`}`
271			`}`
272			`}`