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-rw-r--r--net/ax25/ax25_std_in.c467
1 files changed, 0 insertions, 467 deletions
diff --git a/net/ax25/ax25_std_in.c b/net/ax25/ax25_std_in.c
deleted file mode 100644
index d1cfc3ff9..000000000
--- a/net/ax25/ax25_std_in.c
+++ /dev/null
@@ -1,467 +0,0 @@
-/*
- * AX.25 release 037
- *
- * 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
- * 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.
- * Jonathan(G4KLX) Added IP mode registration.
- * AX.25 030 Jonathan(G4KLX) Added AX.25 fragment reception.
- * Upgraded state machine for SABME.
- * Added arbitrary protocol id support.
- * AX.25 031 Joerg(DL1BKE) Added DAMA support
- * HaJo(DD8NE) Added Idle Disc Timer T5
- * Joerg(DL1BKE) Renamed it to "IDLE" with a slightly
- * different behaviour. Fixed defrag
- * routine (I hope)
- * AX.25 032 Darryl(G7LED) AX.25 segmentation fixed.
- * AX.25 033 Jonathan(G4KLX) Remove auto-router.
- * Modularisation changes.
- * AX.25 035 Hans(PE1AYX) Fixed interface to IP layer.
- * AX.25 036 Jonathan(G4KLX) Cloned from ax25_in.c.
- * AX.25 037 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 <net/ip.h> /* For ip_rcv */
-#include <asm/uaccess.h>
-#include <asm/system.h>
-#include <linux/fcntl.h>
-#include <linux/mm.h>
-#include <linux/interrupt.h>
-
-/*
- * State machine for state 1, Awaiting Connection State.
- * The handling of the timer(s) is in file ax25_std_timer.c.
- * Handling of state 0 and connection release is in ax25.c.
- */
-static int ax25_std_state1_machine(ax25_cb *ax25, struct sk_buff *skb, int frametype, int pf, int type)
-{
- switch (frametype) {
- case AX25_SABM:
- ax25->modulus = AX25_MODULUS;
- ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
- ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE);
- break;
-
- case AX25_SABME:
- ax25->modulus = AX25_EMODULUS;
- ax25->window = ax25->ax25_dev->values[AX25_VALUES_EWINDOW];
- ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE);
- break;
-
- case AX25_DISC:
- ax25_send_control(ax25, AX25_DM, pf, AX25_RESPONSE);
- break;
-
- case AX25_UA:
- if (pf) {
- ax25_calculate_rtt(ax25);
- ax25_stop_t1timer(ax25);
- ax25_start_t3timer(ax25);
- ax25_start_idletimer(ax25);
- ax25->vs = 0;
- ax25->va = 0;
- ax25->vr = 0;
- ax25->state = AX25_STATE_3;
- ax25->n2count = 0;
- if (ax25->sk != NULL) {
- ax25->sk->state = TCP_ESTABLISHED;
- /* For WAIT_SABM connections we will produce an accept ready socket here */
- if (!ax25->sk->dead)
- ax25->sk->state_change(ax25->sk);
- }
- }
- break;
-
- case AX25_DM:
- if (pf) {
- if (ax25->modulus == AX25_MODULUS) {
- ax25_disconnect(ax25, ECONNREFUSED);
- } else {
- ax25->modulus = AX25_MODULUS;
- ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
- }
- }
- break;
-
- default:
- break;
- }
-
- return 0;
-}
-
-/*
- * State machine for state 2, Awaiting Release State.
- * The handling of the timer(s) is in file ax25_std_timer.c
- * Handling of state 0 and connection release is in ax25.c.
- */
-static int ax25_std_state2_machine(ax25_cb *ax25, struct sk_buff *skb, int frametype, int pf, int type)
-{
- switch (frametype) {
- case AX25_SABM:
- case AX25_SABME:
- ax25_send_control(ax25, AX25_DM, pf, AX25_RESPONSE);
- break;
-
- case AX25_DISC:
- ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE);
- ax25_disconnect(ax25, 0);
- break;
-
- case AX25_DM:
- case AX25_UA:
- if (pf) ax25_disconnect(ax25, 0);
- break;
-
- case AX25_I:
- case AX25_REJ:
- case AX25_RNR:
- case AX25_RR:
- if (pf) ax25_send_control(ax25, AX25_DM, AX25_POLLON, AX25_RESPONSE);
- break;
-
- default:
- break;
- }
-
- return 0;
-}
-
-/*
- * State machine for state 3, Connected State.
- * The handling of the timer(s) is in file ax25_std_timer.c
- * Handling of state 0 and connection release is in ax25.c.
- */
-static int ax25_std_state3_machine(ax25_cb *ax25, struct sk_buff *skb, int frametype, int ns, int nr, int pf, int type)
-{
- int queued = 0;
-
- switch (frametype) {
- case AX25_SABM:
- case AX25_SABME:
- if (frametype == AX25_SABM) {
- ax25->modulus = AX25_MODULUS;
- ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
- } else {
- ax25->modulus = AX25_EMODULUS;
- ax25->window = ax25->ax25_dev->values[AX25_VALUES_EWINDOW];
- }
- ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE);
- ax25_stop_t1timer(ax25);
- ax25_stop_t2timer(ax25);
- ax25_start_t3timer(ax25);
- ax25_start_idletimer(ax25);
- ax25->condition = 0x00;
- ax25->vs = 0;
- ax25->va = 0;
- ax25->vr = 0;
- ax25_requeue_frames(ax25);
- break;
-
- case AX25_DISC:
- ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE);
- ax25_disconnect(ax25, 0);
- break;
-
- case AX25_DM:
- ax25_disconnect(ax25, ECONNRESET);
- break;
-
- case AX25_RR:
- case AX25_RNR:
- if (frametype == AX25_RR)
- ax25->condition &= ~AX25_COND_PEER_RX_BUSY;
- else
- ax25->condition |= AX25_COND_PEER_RX_BUSY;
- if (type == AX25_COMMAND && pf)
- ax25_std_enquiry_response(ax25);
- if (ax25_validate_nr(ax25, nr)) {
- ax25_check_iframes_acked(ax25, nr);
- } else {
- ax25_std_nr_error_recovery(ax25);
- ax25->state = AX25_STATE_1;
- }
- break;
-
- case AX25_REJ:
- ax25->condition &= ~AX25_COND_PEER_RX_BUSY;
- if (type == AX25_COMMAND && pf)
- ax25_std_enquiry_response(ax25);
- if (ax25_validate_nr(ax25, nr)) {
- ax25_frames_acked(ax25, nr);
- ax25_calculate_rtt(ax25);
- ax25_stop_t1timer(ax25);
- ax25_start_t3timer(ax25);
- ax25_requeue_frames(ax25);
- } else {
- ax25_std_nr_error_recovery(ax25);
- ax25->state = AX25_STATE_1;
- }
- break;
-
- case AX25_I:
- if (!ax25_validate_nr(ax25, nr)) {
- ax25_std_nr_error_recovery(ax25);
- ax25->state = AX25_STATE_1;
- break;
- }
- if (ax25->condition & AX25_COND_PEER_RX_BUSY) {
- ax25_frames_acked(ax25, nr);
- } else {
- ax25_check_iframes_acked(ax25, nr);
- }
- if (ax25->condition & AX25_COND_OWN_RX_BUSY) {
- if (pf) ax25_std_enquiry_response(ax25);
- break;
- }
- if (ns == ax25->vr) {
- ax25->vr = (ax25->vr + 1) % ax25->modulus;
- queued = ax25_rx_iframe(ax25, skb);
- if (ax25->condition & AX25_COND_OWN_RX_BUSY)
- ax25->vr = ns; /* ax25->vr - 1 */
- ax25->condition &= ~AX25_COND_REJECT;
- if (pf) {
- ax25_std_enquiry_response(ax25);
- } else {
- if (!(ax25->condition & AX25_COND_ACK_PENDING)) {
- ax25->condition |= AX25_COND_ACK_PENDING;
- ax25_start_t2timer(ax25);
- }
- }
- } else {
- if (ax25->condition & AX25_COND_REJECT) {
- if (pf) ax25_std_enquiry_response(ax25);
- } else {
- ax25->condition |= AX25_COND_REJECT;
- ax25_send_control(ax25, AX25_REJ, pf, AX25_RESPONSE);
- ax25->condition &= ~AX25_COND_ACK_PENDING;
- }
- }
- break;
-
- case AX25_FRMR:
- case AX25_ILLEGAL:
- ax25_std_establish_data_link(ax25);
- ax25->state = AX25_STATE_1;
- break;
-
- default:
- break;
- }
-
- return queued;
-}
-
-/*
- * State machine for state 4, Timer Recovery State.
- * The handling of the timer(s) is in file ax25_std_timer.c
- * Handling of state 0 and connection release is in ax25.c.
- */
-static int ax25_std_state4_machine(ax25_cb *ax25, struct sk_buff *skb, int frametype, int ns, int nr, int pf, int type)
-{
- int queued = 0;
-
- switch (frametype) {
- case AX25_SABM:
- case AX25_SABME:
- if (frametype == AX25_SABM) {
- ax25->modulus = AX25_MODULUS;
- ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
- } else {
- ax25->modulus = AX25_EMODULUS;
- ax25->window = ax25->ax25_dev->values[AX25_VALUES_EWINDOW];
- }
- ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE);
- ax25_stop_t1timer(ax25);
- ax25_stop_t2timer(ax25);
- ax25_start_t3timer(ax25);
- ax25_start_idletimer(ax25);
- ax25->condition = 0x00;
- ax25->vs = 0;
- ax25->va = 0;
- ax25->vr = 0;
- ax25->state = AX25_STATE_3;
- ax25->n2count = 0;
- ax25_requeue_frames(ax25);
- break;
-
- case AX25_DISC:
- ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE);
- ax25_disconnect(ax25, 0);
- break;
-
- case AX25_DM:
- ax25_disconnect(ax25, ECONNRESET);
- break;
-
- case AX25_RR:
- case AX25_RNR:
- if (frametype == AX25_RR)
- ax25->condition &= ~AX25_COND_PEER_RX_BUSY;
- else
- ax25->condition |= AX25_COND_PEER_RX_BUSY;
- if (type == AX25_RESPONSE && pf) {
- ax25_stop_t1timer(ax25);
- ax25->n2count = 0;
- if (ax25_validate_nr(ax25, nr)) {
- ax25_frames_acked(ax25, nr);
- if (ax25->vs == ax25->va) {
- ax25_start_t3timer(ax25);
- ax25->state = AX25_STATE_3;
- } else {
- ax25_requeue_frames(ax25);
- }
- } else {
- ax25_std_nr_error_recovery(ax25);
- ax25->state = AX25_STATE_1;
- }
- break;
- }
- if (type == AX25_COMMAND && pf)
- ax25_std_enquiry_response(ax25);
- if (ax25_validate_nr(ax25, nr)) {
- ax25_frames_acked(ax25, nr);
- } else {
- ax25_std_nr_error_recovery(ax25);
- ax25->state = AX25_STATE_1;
- }
- break;
-
- case AX25_REJ:
- ax25->condition &= ~AX25_COND_PEER_RX_BUSY;
- if (pf && type == AX25_RESPONSE) {
- ax25_stop_t1timer(ax25);
- ax25->n2count = 0;
- if (ax25_validate_nr(ax25, nr)) {
- ax25_frames_acked(ax25, nr);
- if (ax25->vs == ax25->va) {
- ax25_start_t3timer(ax25);
- ax25->state = AX25_STATE_3;
- } else {
- ax25_requeue_frames(ax25);
- }
- } else {
- ax25_std_nr_error_recovery(ax25);
- ax25->state = AX25_STATE_1;
- }
- break;
- }
- if (type == AX25_COMMAND && pf)
- ax25_std_enquiry_response(ax25);
- if (ax25_validate_nr(ax25, nr)) {
- ax25_frames_acked(ax25, nr);
- ax25_requeue_frames(ax25);
- } else {
- ax25_std_nr_error_recovery(ax25);
- ax25->state = AX25_STATE_1;
- }
- break;
-
- case AX25_I:
- if (!ax25_validate_nr(ax25, nr)) {
- ax25_std_nr_error_recovery(ax25);
- ax25->state = AX25_STATE_1;
- break;
- }
- ax25_frames_acked(ax25, nr);
- if (ax25->condition & AX25_COND_OWN_RX_BUSY) {
- if (pf) ax25_std_enquiry_response(ax25);
- break;
- }
- if (ns == ax25->vr) {
- ax25->vr = (ax25->vr + 1) % ax25->modulus;
- queued = ax25_rx_iframe(ax25, skb);
- if (ax25->condition & AX25_COND_OWN_RX_BUSY)
- ax25->vr = ns; /* ax25->vr - 1 */
- ax25->condition &= ~AX25_COND_REJECT;
- if (pf) {
- ax25_std_enquiry_response(ax25);
- } else {
- if (!(ax25->condition & AX25_COND_ACK_PENDING)) {
- ax25->condition |= AX25_COND_ACK_PENDING;
- ax25_start_t2timer(ax25);
- }
- }
- } else {
- if (ax25->condition & AX25_COND_REJECT) {
- if (pf) ax25_std_enquiry_response(ax25);
- } else {
- ax25->condition |= AX25_COND_REJECT;
- ax25_send_control(ax25, AX25_REJ, pf, AX25_RESPONSE);
- ax25->condition &= ~AX25_COND_ACK_PENDING;
- }
- }
- break;
-
- case AX25_FRMR:
- case AX25_ILLEGAL:
- ax25_std_establish_data_link(ax25);
- ax25->state = AX25_STATE_1;
- break;
-
- default:
- break;
- }
-
- return queued;
-}
-
-/*
- * Higher level upcall for a LAPB frame
- */
-int ax25_std_frame_in(ax25_cb *ax25, struct sk_buff *skb, int type)
-{
- int queued = 0, frametype, ns, nr, pf;
-
- frametype = ax25_decode(ax25, skb, &ns, &nr, &pf);
-
- switch (ax25->state) {
- case AX25_STATE_1:
- queued = ax25_std_state1_machine(ax25, skb, frametype, pf, type);
- break;
- case AX25_STATE_2:
- queued = ax25_std_state2_machine(ax25, skb, frametype, pf, type);
- break;
- case AX25_STATE_3:
- queued = ax25_std_state3_machine(ax25, skb, frametype, ns, nr, pf, type);
- break;
- case AX25_STATE_4:
- queued = ax25_std_state4_machine(ax25, skb, frametype, ns, nr, pf, type);
- break;
- }
-
- ax25_kick(ax25);
-
- return queued;
-}
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