| 1 |
1275 |
phoenix |
/*
|
| 2 |
|
|
* AX.25 release 037
|
| 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 |
|
|
* AX.25 028a Jonathan(G4KLX) New state machine based on SDL diagrams.
|
| 20 |
|
|
* AX.25 028b Jonathan(G4KLX) Extracted AX25 control block from
|
| 21 |
|
|
* the sock structure.
|
| 22 |
|
|
* AX.25 029 Alan(GW4PTS) Switched to KA9Q constant names.
|
| 23 |
|
|
* Jonathan(G4KLX) Added IP mode registration.
|
| 24 |
|
|
* AX.25 030 Jonathan(G4KLX) Added AX.25 fragment reception.
|
| 25 |
|
|
* Upgraded state machine for SABME.
|
| 26 |
|
|
* Added arbitrary protocol id support.
|
| 27 |
|
|
* AX.25 031 Joerg(DL1BKE) Added DAMA support
|
| 28 |
|
|
* HaJo(DD8NE) Added Idle Disc Timer T5
|
| 29 |
|
|
* Joerg(DL1BKE) Renamed it to "IDLE" with a slightly
|
| 30 |
|
|
* different behaviour. Fixed defrag
|
| 31 |
|
|
* routine (I hope)
|
| 32 |
|
|
* AX.25 032 Darryl(G7LED) AX.25 segmentation fixed.
|
| 33 |
|
|
* AX.25 033 Jonathan(G4KLX) Remove auto-router.
|
| 34 |
|
|
* Modularisation changes.
|
| 35 |
|
|
* AX.25 035 Hans(PE1AYX) Fixed interface to IP layer.
|
| 36 |
|
|
* AX.25 036 Jonathan(G4KLX) Cloned from ax25_in.c.
|
| 37 |
|
|
* AX.25 037 Jonathan(G4KLX) New timer architecture.
|
| 38 |
|
|
*/
|
| 39 |
|
|
|
| 40 |
|
|
#include <linux/errno.h>
|
| 41 |
|
|
#include <linux/types.h>
|
| 42 |
|
|
#include <linux/socket.h>
|
| 43 |
|
|
#include <linux/in.h>
|
| 44 |
|
|
#include <linux/kernel.h>
|
| 45 |
|
|
#include <linux/sched.h>
|
| 46 |
|
|
#include <linux/timer.h>
|
| 47 |
|
|
#include <linux/string.h>
|
| 48 |
|
|
#include <linux/sockios.h>
|
| 49 |
|
|
#include <linux/net.h>
|
| 50 |
|
|
#include <net/ax25.h>
|
| 51 |
|
|
#include <linux/inet.h>
|
| 52 |
|
|
#include <linux/netdevice.h>
|
| 53 |
|
|
#include <linux/skbuff.h>
|
| 54 |
|
|
#include <net/sock.h>
|
| 55 |
|
|
#include <net/ip.h> /* For ip_rcv */
|
| 56 |
|
|
#include <asm/uaccess.h>
|
| 57 |
|
|
#include <asm/system.h>
|
| 58 |
|
|
#include <linux/fcntl.h>
|
| 59 |
|
|
#include <linux/mm.h>
|
| 60 |
|
|
#include <linux/interrupt.h>
|
| 61 |
|
|
|
| 62 |
|
|
/*
|
| 63 |
|
|
* State machine for state 1, Awaiting Connection State.
|
| 64 |
|
|
* The handling of the timer(s) is in file ax25_std_timer.c.
|
| 65 |
|
|
* Handling of state 0 and connection release is in ax25.c.
|
| 66 |
|
|
*/
|
| 67 |
|
|
static int ax25_std_state1_machine(ax25_cb *ax25, struct sk_buff *skb, int frametype, int pf, int type)
|
| 68 |
|
|
{
|
| 69 |
|
|
switch (frametype) {
|
| 70 |
|
|
case AX25_SABM:
|
| 71 |
|
|
ax25->modulus = AX25_MODULUS;
|
| 72 |
|
|
ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
|
| 73 |
|
|
ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE);
|
| 74 |
|
|
break;
|
| 75 |
|
|
|
| 76 |
|
|
case AX25_SABME:
|
| 77 |
|
|
ax25->modulus = AX25_EMODULUS;
|
| 78 |
|
|
ax25->window = ax25->ax25_dev->values[AX25_VALUES_EWINDOW];
|
| 79 |
|
|
ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE);
|
| 80 |
|
|
break;
|
| 81 |
|
|
|
| 82 |
|
|
case AX25_DISC:
|
| 83 |
|
|
ax25_send_control(ax25, AX25_DM, pf, AX25_RESPONSE);
|
| 84 |
|
|
break;
|
| 85 |
|
|
|
| 86 |
|
|
case AX25_UA:
|
| 87 |
|
|
if (pf) {
|
| 88 |
|
|
ax25_calculate_rtt(ax25);
|
| 89 |
|
|
ax25_stop_t1timer(ax25);
|
| 90 |
|
|
ax25_start_t3timer(ax25);
|
| 91 |
|
|
ax25_start_idletimer(ax25);
|
| 92 |
|
|
ax25->vs = 0;
|
| 93 |
|
|
ax25->va = 0;
|
| 94 |
|
|
ax25->vr = 0;
|
| 95 |
|
|
ax25->state = AX25_STATE_3;
|
| 96 |
|
|
ax25->n2count = 0;
|
| 97 |
|
|
if (ax25->sk != NULL) {
|
| 98 |
|
|
ax25->sk->state = TCP_ESTABLISHED;
|
| 99 |
|
|
/* For WAIT_SABM connections we will produce an accept ready socket here */
|
| 100 |
|
|
if (!ax25->sk->dead)
|
| 101 |
|
|
ax25->sk->state_change(ax25->sk);
|
| 102 |
|
|
}
|
| 103 |
|
|
}
|
| 104 |
|
|
break;
|
| 105 |
|
|
|
| 106 |
|
|
case AX25_DM:
|
| 107 |
|
|
if (pf) {
|
| 108 |
|
|
if (ax25->modulus == AX25_MODULUS) {
|
| 109 |
|
|
ax25_disconnect(ax25, ECONNREFUSED);
|
| 110 |
|
|
} else {
|
| 111 |
|
|
ax25->modulus = AX25_MODULUS;
|
| 112 |
|
|
ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
|
| 113 |
|
|
}
|
| 114 |
|
|
}
|
| 115 |
|
|
break;
|
| 116 |
|
|
|
| 117 |
|
|
default:
|
| 118 |
|
|
break;
|
| 119 |
|
|
}
|
| 120 |
|
|
|
| 121 |
|
|
return 0;
|
| 122 |
|
|
}
|
| 123 |
|
|
|
| 124 |
|
|
/*
|
| 125 |
|
|
* State machine for state 2, Awaiting Release State.
|
| 126 |
|
|
* The handling of the timer(s) is in file ax25_std_timer.c
|
| 127 |
|
|
* Handling of state 0 and connection release is in ax25.c.
|
| 128 |
|
|
*/
|
| 129 |
|
|
static int ax25_std_state2_machine(ax25_cb *ax25, struct sk_buff *skb, int frametype, int pf, int type)
|
| 130 |
|
|
{
|
| 131 |
|
|
switch (frametype) {
|
| 132 |
|
|
case AX25_SABM:
|
| 133 |
|
|
case AX25_SABME:
|
| 134 |
|
|
ax25_send_control(ax25, AX25_DM, pf, AX25_RESPONSE);
|
| 135 |
|
|
break;
|
| 136 |
|
|
|
| 137 |
|
|
case AX25_DISC:
|
| 138 |
|
|
ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE);
|
| 139 |
|
|
ax25_disconnect(ax25, 0);
|
| 140 |
|
|
break;
|
| 141 |
|
|
|
| 142 |
|
|
case AX25_DM:
|
| 143 |
|
|
case AX25_UA:
|
| 144 |
|
|
if (pf) ax25_disconnect(ax25, 0);
|
| 145 |
|
|
break;
|
| 146 |
|
|
|
| 147 |
|
|
case AX25_I:
|
| 148 |
|
|
case AX25_REJ:
|
| 149 |
|
|
case AX25_RNR:
|
| 150 |
|
|
case AX25_RR:
|
| 151 |
|
|
if (pf) ax25_send_control(ax25, AX25_DM, AX25_POLLON, AX25_RESPONSE);
|
| 152 |
|
|
break;
|
| 153 |
|
|
|
| 154 |
|
|
default:
|
| 155 |
|
|
break;
|
| 156 |
|
|
}
|
| 157 |
|
|
|
| 158 |
|
|
return 0;
|
| 159 |
|
|
}
|
| 160 |
|
|
|
| 161 |
|
|
/*
|
| 162 |
|
|
* State machine for state 3, Connected State.
|
| 163 |
|
|
* The handling of the timer(s) is in file ax25_std_timer.c
|
| 164 |
|
|
* Handling of state 0 and connection release is in ax25.c.
|
| 165 |
|
|
*/
|
| 166 |
|
|
static int ax25_std_state3_machine(ax25_cb *ax25, struct sk_buff *skb, int frametype, int ns, int nr, int pf, int type)
|
| 167 |
|
|
{
|
| 168 |
|
|
int queued = 0;
|
| 169 |
|
|
|
| 170 |
|
|
switch (frametype) {
|
| 171 |
|
|
case AX25_SABM:
|
| 172 |
|
|
case AX25_SABME:
|
| 173 |
|
|
if (frametype == AX25_SABM) {
|
| 174 |
|
|
ax25->modulus = AX25_MODULUS;
|
| 175 |
|
|
ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
|
| 176 |
|
|
} else {
|
| 177 |
|
|
ax25->modulus = AX25_EMODULUS;
|
| 178 |
|
|
ax25->window = ax25->ax25_dev->values[AX25_VALUES_EWINDOW];
|
| 179 |
|
|
}
|
| 180 |
|
|
ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE);
|
| 181 |
|
|
ax25_stop_t1timer(ax25);
|
| 182 |
|
|
ax25_stop_t2timer(ax25);
|
| 183 |
|
|
ax25_start_t3timer(ax25);
|
| 184 |
|
|
ax25_start_idletimer(ax25);
|
| 185 |
|
|
ax25->condition = 0x00;
|
| 186 |
|
|
ax25->vs = 0;
|
| 187 |
|
|
ax25->va = 0;
|
| 188 |
|
|
ax25->vr = 0;
|
| 189 |
|
|
ax25_requeue_frames(ax25);
|
| 190 |
|
|
break;
|
| 191 |
|
|
|
| 192 |
|
|
case AX25_DISC:
|
| 193 |
|
|
ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE);
|
| 194 |
|
|
ax25_disconnect(ax25, 0);
|
| 195 |
|
|
break;
|
| 196 |
|
|
|
| 197 |
|
|
case AX25_DM:
|
| 198 |
|
|
ax25_disconnect(ax25, ECONNRESET);
|
| 199 |
|
|
break;
|
| 200 |
|
|
|
| 201 |
|
|
case AX25_RR:
|
| 202 |
|
|
case AX25_RNR:
|
| 203 |
|
|
if (frametype == AX25_RR)
|
| 204 |
|
|
ax25->condition &= ~AX25_COND_PEER_RX_BUSY;
|
| 205 |
|
|
else
|
| 206 |
|
|
ax25->condition |= AX25_COND_PEER_RX_BUSY;
|
| 207 |
|
|
if (type == AX25_COMMAND && pf)
|
| 208 |
|
|
ax25_std_enquiry_response(ax25);
|
| 209 |
|
|
if (ax25_validate_nr(ax25, nr)) {
|
| 210 |
|
|
ax25_check_iframes_acked(ax25, nr);
|
| 211 |
|
|
} else {
|
| 212 |
|
|
ax25_std_nr_error_recovery(ax25);
|
| 213 |
|
|
ax25->state = AX25_STATE_1;
|
| 214 |
|
|
}
|
| 215 |
|
|
break;
|
| 216 |
|
|
|
| 217 |
|
|
case AX25_REJ:
|
| 218 |
|
|
ax25->condition &= ~AX25_COND_PEER_RX_BUSY;
|
| 219 |
|
|
if (type == AX25_COMMAND && pf)
|
| 220 |
|
|
ax25_std_enquiry_response(ax25);
|
| 221 |
|
|
if (ax25_validate_nr(ax25, nr)) {
|
| 222 |
|
|
ax25_frames_acked(ax25, nr);
|
| 223 |
|
|
ax25_calculate_rtt(ax25);
|
| 224 |
|
|
ax25_stop_t1timer(ax25);
|
| 225 |
|
|
ax25_start_t3timer(ax25);
|
| 226 |
|
|
ax25_requeue_frames(ax25);
|
| 227 |
|
|
} else {
|
| 228 |
|
|
ax25_std_nr_error_recovery(ax25);
|
| 229 |
|
|
ax25->state = AX25_STATE_1;
|
| 230 |
|
|
}
|
| 231 |
|
|
break;
|
| 232 |
|
|
|
| 233 |
|
|
case AX25_I:
|
| 234 |
|
|
if (!ax25_validate_nr(ax25, nr)) {
|
| 235 |
|
|
ax25_std_nr_error_recovery(ax25);
|
| 236 |
|
|
ax25->state = AX25_STATE_1;
|
| 237 |
|
|
break;
|
| 238 |
|
|
}
|
| 239 |
|
|
if (ax25->condition & AX25_COND_PEER_RX_BUSY) {
|
| 240 |
|
|
ax25_frames_acked(ax25, nr);
|
| 241 |
|
|
} else {
|
| 242 |
|
|
ax25_check_iframes_acked(ax25, nr);
|
| 243 |
|
|
}
|
| 244 |
|
|
if (ax25->condition & AX25_COND_OWN_RX_BUSY) {
|
| 245 |
|
|
if (pf) ax25_std_enquiry_response(ax25);
|
| 246 |
|
|
break;
|
| 247 |
|
|
}
|
| 248 |
|
|
if (ns == ax25->vr) {
|
| 249 |
|
|
ax25->vr = (ax25->vr + 1) % ax25->modulus;
|
| 250 |
|
|
queued = ax25_rx_iframe(ax25, skb);
|
| 251 |
|
|
if (ax25->condition & AX25_COND_OWN_RX_BUSY)
|
| 252 |
|
|
ax25->vr = ns; /* ax25->vr - 1 */
|
| 253 |
|
|
ax25->condition &= ~AX25_COND_REJECT;
|
| 254 |
|
|
if (pf) {
|
| 255 |
|
|
ax25_std_enquiry_response(ax25);
|
| 256 |
|
|
} else {
|
| 257 |
|
|
if (!(ax25->condition & AX25_COND_ACK_PENDING)) {
|
| 258 |
|
|
ax25->condition |= AX25_COND_ACK_PENDING;
|
| 259 |
|
|
ax25_start_t2timer(ax25);
|
| 260 |
|
|
}
|
| 261 |
|
|
}
|
| 262 |
|
|
} else {
|
| 263 |
|
|
if (ax25->condition & AX25_COND_REJECT) {
|
| 264 |
|
|
if (pf) ax25_std_enquiry_response(ax25);
|
| 265 |
|
|
} else {
|
| 266 |
|
|
ax25->condition |= AX25_COND_REJECT;
|
| 267 |
|
|
ax25_send_control(ax25, AX25_REJ, pf, AX25_RESPONSE);
|
| 268 |
|
|
ax25->condition &= ~AX25_COND_ACK_PENDING;
|
| 269 |
|
|
}
|
| 270 |
|
|
}
|
| 271 |
|
|
break;
|
| 272 |
|
|
|
| 273 |
|
|
case AX25_FRMR:
|
| 274 |
|
|
case AX25_ILLEGAL:
|
| 275 |
|
|
ax25_std_establish_data_link(ax25);
|
| 276 |
|
|
ax25->state = AX25_STATE_1;
|
| 277 |
|
|
break;
|
| 278 |
|
|
|
| 279 |
|
|
default:
|
| 280 |
|
|
break;
|
| 281 |
|
|
}
|
| 282 |
|
|
|
| 283 |
|
|
return queued;
|
| 284 |
|
|
}
|
| 285 |
|
|
|
| 286 |
|
|
/*
|
| 287 |
|
|
* State machine for state 4, Timer Recovery State.
|
| 288 |
|
|
* The handling of the timer(s) is in file ax25_std_timer.c
|
| 289 |
|
|
* Handling of state 0 and connection release is in ax25.c.
|
| 290 |
|
|
*/
|
| 291 |
|
|
static int ax25_std_state4_machine(ax25_cb *ax25, struct sk_buff *skb, int frametype, int ns, int nr, int pf, int type)
|
| 292 |
|
|
{
|
| 293 |
|
|
int queued = 0;
|
| 294 |
|
|
|
| 295 |
|
|
switch (frametype) {
|
| 296 |
|
|
case AX25_SABM:
|
| 297 |
|
|
case AX25_SABME:
|
| 298 |
|
|
if (frametype == AX25_SABM) {
|
| 299 |
|
|
ax25->modulus = AX25_MODULUS;
|
| 300 |
|
|
ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
|
| 301 |
|
|
} else {
|
| 302 |
|
|
ax25->modulus = AX25_EMODULUS;
|
| 303 |
|
|
ax25->window = ax25->ax25_dev->values[AX25_VALUES_EWINDOW];
|
| 304 |
|
|
}
|
| 305 |
|
|
ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE);
|
| 306 |
|
|
ax25_stop_t1timer(ax25);
|
| 307 |
|
|
ax25_stop_t2timer(ax25);
|
| 308 |
|
|
ax25_start_t3timer(ax25);
|
| 309 |
|
|
ax25_start_idletimer(ax25);
|
| 310 |
|
|
ax25->condition = 0x00;
|
| 311 |
|
|
ax25->vs = 0;
|
| 312 |
|
|
ax25->va = 0;
|
| 313 |
|
|
ax25->vr = 0;
|
| 314 |
|
|
ax25->state = AX25_STATE_3;
|
| 315 |
|
|
ax25->n2count = 0;
|
| 316 |
|
|
ax25_requeue_frames(ax25);
|
| 317 |
|
|
break;
|
| 318 |
|
|
|
| 319 |
|
|
case AX25_DISC:
|
| 320 |
|
|
ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE);
|
| 321 |
|
|
ax25_disconnect(ax25, 0);
|
| 322 |
|
|
break;
|
| 323 |
|
|
|
| 324 |
|
|
case AX25_DM:
|
| 325 |
|
|
ax25_disconnect(ax25, ECONNRESET);
|
| 326 |
|
|
break;
|
| 327 |
|
|
|
| 328 |
|
|
case AX25_RR:
|
| 329 |
|
|
case AX25_RNR:
|
| 330 |
|
|
if (frametype == AX25_RR)
|
| 331 |
|
|
ax25->condition &= ~AX25_COND_PEER_RX_BUSY;
|
| 332 |
|
|
else
|
| 333 |
|
|
ax25->condition |= AX25_COND_PEER_RX_BUSY;
|
| 334 |
|
|
if (type == AX25_RESPONSE && pf) {
|
| 335 |
|
|
ax25_stop_t1timer(ax25);
|
| 336 |
|
|
ax25->n2count = 0;
|
| 337 |
|
|
if (ax25_validate_nr(ax25, nr)) {
|
| 338 |
|
|
ax25_frames_acked(ax25, nr);
|
| 339 |
|
|
if (ax25->vs == ax25->va) {
|
| 340 |
|
|
ax25_start_t3timer(ax25);
|
| 341 |
|
|
ax25->state = AX25_STATE_3;
|
| 342 |
|
|
} else {
|
| 343 |
|
|
ax25_requeue_frames(ax25);
|
| 344 |
|
|
}
|
| 345 |
|
|
} else {
|
| 346 |
|
|
ax25_std_nr_error_recovery(ax25);
|
| 347 |
|
|
ax25->state = AX25_STATE_1;
|
| 348 |
|
|
}
|
| 349 |
|
|
break;
|
| 350 |
|
|
}
|
| 351 |
|
|
if (type == AX25_COMMAND && pf)
|
| 352 |
|
|
ax25_std_enquiry_response(ax25);
|
| 353 |
|
|
if (ax25_validate_nr(ax25, nr)) {
|
| 354 |
|
|
ax25_frames_acked(ax25, nr);
|
| 355 |
|
|
} else {
|
| 356 |
|
|
ax25_std_nr_error_recovery(ax25);
|
| 357 |
|
|
ax25->state = AX25_STATE_1;
|
| 358 |
|
|
}
|
| 359 |
|
|
break;
|
| 360 |
|
|
|
| 361 |
|
|
case AX25_REJ:
|
| 362 |
|
|
ax25->condition &= ~AX25_COND_PEER_RX_BUSY;
|
| 363 |
|
|
if (pf && type == AX25_RESPONSE) {
|
| 364 |
|
|
ax25_stop_t1timer(ax25);
|
| 365 |
|
|
ax25->n2count = 0;
|
| 366 |
|
|
if (ax25_validate_nr(ax25, nr)) {
|
| 367 |
|
|
ax25_frames_acked(ax25, nr);
|
| 368 |
|
|
if (ax25->vs == ax25->va) {
|
| 369 |
|
|
ax25_start_t3timer(ax25);
|
| 370 |
|
|
ax25->state = AX25_STATE_3;
|
| 371 |
|
|
} else {
|
| 372 |
|
|
ax25_requeue_frames(ax25);
|
| 373 |
|
|
}
|
| 374 |
|
|
} else {
|
| 375 |
|
|
ax25_std_nr_error_recovery(ax25);
|
| 376 |
|
|
ax25->state = AX25_STATE_1;
|
| 377 |
|
|
}
|
| 378 |
|
|
break;
|
| 379 |
|
|
}
|
| 380 |
|
|
if (type == AX25_COMMAND && pf)
|
| 381 |
|
|
ax25_std_enquiry_response(ax25);
|
| 382 |
|
|
if (ax25_validate_nr(ax25, nr)) {
|
| 383 |
|
|
ax25_frames_acked(ax25, nr);
|
| 384 |
|
|
ax25_requeue_frames(ax25);
|
| 385 |
|
|
} else {
|
| 386 |
|
|
ax25_std_nr_error_recovery(ax25);
|
| 387 |
|
|
ax25->state = AX25_STATE_1;
|
| 388 |
|
|
}
|
| 389 |
|
|
break;
|
| 390 |
|
|
|
| 391 |
|
|
case AX25_I:
|
| 392 |
|
|
if (!ax25_validate_nr(ax25, nr)) {
|
| 393 |
|
|
ax25_std_nr_error_recovery(ax25);
|
| 394 |
|
|
ax25->state = AX25_STATE_1;
|
| 395 |
|
|
break;
|
| 396 |
|
|
}
|
| 397 |
|
|
ax25_frames_acked(ax25, nr);
|
| 398 |
|
|
if (ax25->condition & AX25_COND_OWN_RX_BUSY) {
|
| 399 |
|
|
if (pf) ax25_std_enquiry_response(ax25);
|
| 400 |
|
|
break;
|
| 401 |
|
|
}
|
| 402 |
|
|
if (ns == ax25->vr) {
|
| 403 |
|
|
ax25->vr = (ax25->vr + 1) % ax25->modulus;
|
| 404 |
|
|
queued = ax25_rx_iframe(ax25, skb);
|
| 405 |
|
|
if (ax25->condition & AX25_COND_OWN_RX_BUSY)
|
| 406 |
|
|
ax25->vr = ns; /* ax25->vr - 1 */
|
| 407 |
|
|
ax25->condition &= ~AX25_COND_REJECT;
|
| 408 |
|
|
if (pf) {
|
| 409 |
|
|
ax25_std_enquiry_response(ax25);
|
| 410 |
|
|
} else {
|
| 411 |
|
|
if (!(ax25->condition & AX25_COND_ACK_PENDING)) {
|
| 412 |
|
|
ax25->condition |= AX25_COND_ACK_PENDING;
|
| 413 |
|
|
ax25_start_t2timer(ax25);
|
| 414 |
|
|
}
|
| 415 |
|
|
}
|
| 416 |
|
|
} else {
|
| 417 |
|
|
if (ax25->condition & AX25_COND_REJECT) {
|
| 418 |
|
|
if (pf) ax25_std_enquiry_response(ax25);
|
| 419 |
|
|
} else {
|
| 420 |
|
|
ax25->condition |= AX25_COND_REJECT;
|
| 421 |
|
|
ax25_send_control(ax25, AX25_REJ, pf, AX25_RESPONSE);
|
| 422 |
|
|
ax25->condition &= ~AX25_COND_ACK_PENDING;
|
| 423 |
|
|
}
|
| 424 |
|
|
}
|
| 425 |
|
|
break;
|
| 426 |
|
|
|
| 427 |
|
|
case AX25_FRMR:
|
| 428 |
|
|
case AX25_ILLEGAL:
|
| 429 |
|
|
ax25_std_establish_data_link(ax25);
|
| 430 |
|
|
ax25->state = AX25_STATE_1;
|
| 431 |
|
|
break;
|
| 432 |
|
|
|
| 433 |
|
|
default:
|
| 434 |
|
|
break;
|
| 435 |
|
|
}
|
| 436 |
|
|
|
| 437 |
|
|
return queued;
|
| 438 |
|
|
}
|
| 439 |
|
|
|
| 440 |
|
|
/*
|
| 441 |
|
|
* Higher level upcall for a LAPB frame
|
| 442 |
|
|
*/
|
| 443 |
|
|
int ax25_std_frame_in(ax25_cb *ax25, struct sk_buff *skb, int type)
|
| 444 |
|
|
{
|
| 445 |
|
|
int queued = 0, frametype, ns, nr, pf;
|
| 446 |
|
|
|
| 447 |
|
|
frametype = ax25_decode(ax25, skb, &ns, &nr, &pf);
|
| 448 |
|
|
|
| 449 |
|
|
switch (ax25->state) {
|
| 450 |
|
|
case AX25_STATE_1:
|
| 451 |
|
|
queued = ax25_std_state1_machine(ax25, skb, frametype, pf, type);
|
| 452 |
|
|
break;
|
| 453 |
|
|
case AX25_STATE_2:
|
| 454 |
|
|
queued = ax25_std_state2_machine(ax25, skb, frametype, pf, type);
|
| 455 |
|
|
break;
|
| 456 |
|
|
case AX25_STATE_3:
|
| 457 |
|
|
queued = ax25_std_state3_machine(ax25, skb, frametype, ns, nr, pf, type);
|
| 458 |
|
|
break;
|
| 459 |
|
|
case AX25_STATE_4:
|
| 460 |
|
|
queued = ax25_std_state4_machine(ax25, skb, frametype, ns, nr, pf, type);
|
| 461 |
|
|
break;
|
| 462 |
|
|
}
|
| 463 |
|
|
|
| 464 |
|
|
ax25_kick(ax25);
|
| 465 |
|
|
|
| 466 |
|
|
return queued;
|
| 467 |
|
|
}
|
