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556 lines
15 KiB
556 lines
15 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* LAPB release 002 |
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* |
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* This code REQUIRES 2.1.15 or higher/ NET3.038 |
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* |
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* History |
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* LAPB 001 Jonathan Naulor Started Coding |
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* LAPB 002 Jonathan Naylor New timer architecture. |
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* 2000-10-29 Henner Eisen lapb_data_indication() return status. |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/errno.h> |
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#include <linux/types.h> |
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#include <linux/socket.h> |
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#include <linux/in.h> |
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#include <linux/kernel.h> |
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#include <linux/timer.h> |
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#include <linux/string.h> |
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#include <linux/sockios.h> |
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#include <linux/net.h> |
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#include <linux/inet.h> |
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#include <linux/netdevice.h> |
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#include <linux/skbuff.h> |
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#include <linux/slab.h> |
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#include <net/sock.h> |
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#include <linux/uaccess.h> |
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#include <linux/fcntl.h> |
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#include <linux/mm.h> |
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#include <linux/interrupt.h> |
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#include <net/lapb.h> |
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/* |
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* State machine for state 0, Disconnected State. |
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* The handling of the timer(s) is in file lapb_timer.c. |
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*/ |
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static void lapb_state0_machine(struct lapb_cb *lapb, struct sk_buff *skb, |
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struct lapb_frame *frame) |
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{ |
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switch (frame->type) { |
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case LAPB_SABM: |
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lapb_dbg(1, "(%p) S0 RX SABM(%d)\n", lapb->dev, frame->pf); |
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if (lapb->mode & LAPB_EXTENDED) { |
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lapb_dbg(1, "(%p) S0 TX DM(%d)\n", |
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lapb->dev, frame->pf); |
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lapb_send_control(lapb, LAPB_DM, frame->pf, |
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LAPB_RESPONSE); |
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} else { |
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lapb_dbg(1, "(%p) S0 TX UA(%d)\n", |
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lapb->dev, frame->pf); |
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lapb_dbg(0, "(%p) S0 -> S3\n", lapb->dev); |
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lapb_send_control(lapb, LAPB_UA, frame->pf, |
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LAPB_RESPONSE); |
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lapb_stop_t1timer(lapb); |
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lapb_stop_t2timer(lapb); |
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lapb->state = LAPB_STATE_3; |
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lapb->condition = 0x00; |
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lapb->n2count = 0; |
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lapb->vs = 0; |
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lapb->vr = 0; |
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lapb->va = 0; |
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lapb_connect_indication(lapb, LAPB_OK); |
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} |
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break; |
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case LAPB_SABME: |
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lapb_dbg(1, "(%p) S0 RX SABME(%d)\n", lapb->dev, frame->pf); |
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if (lapb->mode & LAPB_EXTENDED) { |
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lapb_dbg(1, "(%p) S0 TX UA(%d)\n", |
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lapb->dev, frame->pf); |
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lapb_dbg(0, "(%p) S0 -> S3\n", lapb->dev); |
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lapb_send_control(lapb, LAPB_UA, frame->pf, |
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LAPB_RESPONSE); |
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lapb_stop_t1timer(lapb); |
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lapb_stop_t2timer(lapb); |
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lapb->state = LAPB_STATE_3; |
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lapb->condition = 0x00; |
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lapb->n2count = 0; |
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lapb->vs = 0; |
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lapb->vr = 0; |
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lapb->va = 0; |
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lapb_connect_indication(lapb, LAPB_OK); |
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} else { |
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lapb_dbg(1, "(%p) S0 TX DM(%d)\n", |
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lapb->dev, frame->pf); |
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lapb_send_control(lapb, LAPB_DM, frame->pf, |
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LAPB_RESPONSE); |
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} |
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break; |
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case LAPB_DISC: |
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lapb_dbg(1, "(%p) S0 RX DISC(%d)\n", lapb->dev, frame->pf); |
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lapb_dbg(1, "(%p) S0 TX UA(%d)\n", lapb->dev, frame->pf); |
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lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE); |
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break; |
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default: |
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break; |
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} |
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kfree_skb(skb); |
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} |
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/* |
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* State machine for state 1, Awaiting Connection State. |
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* The handling of the timer(s) is in file lapb_timer.c. |
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*/ |
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static void lapb_state1_machine(struct lapb_cb *lapb, struct sk_buff *skb, |
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struct lapb_frame *frame) |
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{ |
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switch (frame->type) { |
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case LAPB_SABM: |
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lapb_dbg(1, "(%p) S1 RX SABM(%d)\n", lapb->dev, frame->pf); |
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if (lapb->mode & LAPB_EXTENDED) { |
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lapb_dbg(1, "(%p) S1 TX DM(%d)\n", |
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lapb->dev, frame->pf); |
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lapb_send_control(lapb, LAPB_DM, frame->pf, |
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LAPB_RESPONSE); |
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} else { |
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lapb_dbg(1, "(%p) S1 TX UA(%d)\n", |
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lapb->dev, frame->pf); |
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lapb_send_control(lapb, LAPB_UA, frame->pf, |
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LAPB_RESPONSE); |
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} |
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break; |
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case LAPB_SABME: |
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lapb_dbg(1, "(%p) S1 RX SABME(%d)\n", lapb->dev, frame->pf); |
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if (lapb->mode & LAPB_EXTENDED) { |
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lapb_dbg(1, "(%p) S1 TX UA(%d)\n", |
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lapb->dev, frame->pf); |
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lapb_send_control(lapb, LAPB_UA, frame->pf, |
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LAPB_RESPONSE); |
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} else { |
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lapb_dbg(1, "(%p) S1 TX DM(%d)\n", |
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lapb->dev, frame->pf); |
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lapb_send_control(lapb, LAPB_DM, frame->pf, |
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LAPB_RESPONSE); |
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} |
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break; |
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case LAPB_DISC: |
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lapb_dbg(1, "(%p) S1 RX DISC(%d)\n", lapb->dev, frame->pf); |
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lapb_dbg(1, "(%p) S1 TX DM(%d)\n", lapb->dev, frame->pf); |
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lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE); |
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break; |
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case LAPB_UA: |
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lapb_dbg(1, "(%p) S1 RX UA(%d)\n", lapb->dev, frame->pf); |
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if (frame->pf) { |
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lapb_dbg(0, "(%p) S1 -> S3\n", lapb->dev); |
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lapb_stop_t1timer(lapb); |
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lapb_stop_t2timer(lapb); |
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lapb->state = LAPB_STATE_3; |
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lapb->condition = 0x00; |
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lapb->n2count = 0; |
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lapb->vs = 0; |
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lapb->vr = 0; |
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lapb->va = 0; |
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lapb_connect_confirmation(lapb, LAPB_OK); |
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} |
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break; |
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case LAPB_DM: |
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lapb_dbg(1, "(%p) S1 RX DM(%d)\n", lapb->dev, frame->pf); |
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if (frame->pf) { |
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lapb_dbg(0, "(%p) S1 -> S0\n", lapb->dev); |
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lapb_clear_queues(lapb); |
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lapb->state = LAPB_STATE_0; |
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lapb_start_t1timer(lapb); |
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lapb_stop_t2timer(lapb); |
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lapb_disconnect_indication(lapb, LAPB_REFUSED); |
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} |
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break; |
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} |
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kfree_skb(skb); |
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} |
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/* |
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* State machine for state 2, Awaiting Release State. |
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* The handling of the timer(s) is in file lapb_timer.c |
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*/ |
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static void lapb_state2_machine(struct lapb_cb *lapb, struct sk_buff *skb, |
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struct lapb_frame *frame) |
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{ |
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switch (frame->type) { |
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case LAPB_SABM: |
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case LAPB_SABME: |
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lapb_dbg(1, "(%p) S2 RX {SABM,SABME}(%d)\n", |
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lapb->dev, frame->pf); |
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lapb_dbg(1, "(%p) S2 TX DM(%d)\n", lapb->dev, frame->pf); |
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lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE); |
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break; |
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case LAPB_DISC: |
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lapb_dbg(1, "(%p) S2 RX DISC(%d)\n", lapb->dev, frame->pf); |
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lapb_dbg(1, "(%p) S2 TX UA(%d)\n", lapb->dev, frame->pf); |
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lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE); |
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break; |
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case LAPB_UA: |
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lapb_dbg(1, "(%p) S2 RX UA(%d)\n", lapb->dev, frame->pf); |
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if (frame->pf) { |
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lapb_dbg(0, "(%p) S2 -> S0\n", lapb->dev); |
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lapb->state = LAPB_STATE_0; |
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lapb_start_t1timer(lapb); |
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lapb_stop_t2timer(lapb); |
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lapb_disconnect_confirmation(lapb, LAPB_OK); |
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} |
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break; |
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case LAPB_DM: |
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lapb_dbg(1, "(%p) S2 RX DM(%d)\n", lapb->dev, frame->pf); |
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if (frame->pf) { |
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lapb_dbg(0, "(%p) S2 -> S0\n", lapb->dev); |
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lapb->state = LAPB_STATE_0; |
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lapb_start_t1timer(lapb); |
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lapb_stop_t2timer(lapb); |
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lapb_disconnect_confirmation(lapb, LAPB_NOTCONNECTED); |
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} |
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break; |
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case LAPB_I: |
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case LAPB_REJ: |
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case LAPB_RNR: |
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case LAPB_RR: |
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lapb_dbg(1, "(%p) S2 RX {I,REJ,RNR,RR}(%d)\n", |
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lapb->dev, frame->pf); |
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lapb_dbg(1, "(%p) S2 RX DM(%d)\n", lapb->dev, frame->pf); |
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if (frame->pf) |
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lapb_send_control(lapb, LAPB_DM, frame->pf, |
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LAPB_RESPONSE); |
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break; |
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} |
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kfree_skb(skb); |
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} |
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/* |
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* State machine for state 3, Connected State. |
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* The handling of the timer(s) is in file lapb_timer.c |
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*/ |
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static void lapb_state3_machine(struct lapb_cb *lapb, struct sk_buff *skb, |
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struct lapb_frame *frame) |
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{ |
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int queued = 0; |
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int modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : |
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LAPB_SMODULUS; |
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switch (frame->type) { |
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case LAPB_SABM: |
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lapb_dbg(1, "(%p) S3 RX SABM(%d)\n", lapb->dev, frame->pf); |
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if (lapb->mode & LAPB_EXTENDED) { |
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lapb_dbg(1, "(%p) S3 TX DM(%d)\n", |
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lapb->dev, frame->pf); |
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lapb_send_control(lapb, LAPB_DM, frame->pf, |
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LAPB_RESPONSE); |
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} else { |
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lapb_dbg(1, "(%p) S3 TX UA(%d)\n", |
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lapb->dev, frame->pf); |
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lapb_send_control(lapb, LAPB_UA, frame->pf, |
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LAPB_RESPONSE); |
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lapb_stop_t1timer(lapb); |
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lapb_stop_t2timer(lapb); |
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lapb->condition = 0x00; |
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lapb->n2count = 0; |
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lapb->vs = 0; |
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lapb->vr = 0; |
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lapb->va = 0; |
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lapb_requeue_frames(lapb); |
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} |
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break; |
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case LAPB_SABME: |
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lapb_dbg(1, "(%p) S3 RX SABME(%d)\n", lapb->dev, frame->pf); |
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if (lapb->mode & LAPB_EXTENDED) { |
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lapb_dbg(1, "(%p) S3 TX UA(%d)\n", |
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lapb->dev, frame->pf); |
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lapb_send_control(lapb, LAPB_UA, frame->pf, |
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LAPB_RESPONSE); |
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lapb_stop_t1timer(lapb); |
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lapb_stop_t2timer(lapb); |
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lapb->condition = 0x00; |
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lapb->n2count = 0; |
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lapb->vs = 0; |
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lapb->vr = 0; |
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lapb->va = 0; |
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lapb_requeue_frames(lapb); |
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} else { |
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lapb_dbg(1, "(%p) S3 TX DM(%d)\n", |
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lapb->dev, frame->pf); |
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lapb_send_control(lapb, LAPB_DM, frame->pf, |
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LAPB_RESPONSE); |
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} |
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break; |
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case LAPB_DISC: |
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lapb_dbg(1, "(%p) S3 RX DISC(%d)\n", lapb->dev, frame->pf); |
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lapb_dbg(0, "(%p) S3 -> S0\n", lapb->dev); |
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lapb_clear_queues(lapb); |
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lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE); |
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lapb_start_t1timer(lapb); |
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lapb_stop_t2timer(lapb); |
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lapb->state = LAPB_STATE_0; |
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lapb_disconnect_indication(lapb, LAPB_OK); |
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break; |
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case LAPB_DM: |
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lapb_dbg(1, "(%p) S3 RX DM(%d)\n", lapb->dev, frame->pf); |
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lapb_dbg(0, "(%p) S3 -> S0\n", lapb->dev); |
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lapb_clear_queues(lapb); |
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lapb->state = LAPB_STATE_0; |
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lapb_start_t1timer(lapb); |
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lapb_stop_t2timer(lapb); |
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lapb_disconnect_indication(lapb, LAPB_NOTCONNECTED); |
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break; |
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case LAPB_RNR: |
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lapb_dbg(1, "(%p) S3 RX RNR(%d) R%d\n", |
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lapb->dev, frame->pf, frame->nr); |
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lapb->condition |= LAPB_PEER_RX_BUSY_CONDITION; |
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lapb_check_need_response(lapb, frame->cr, frame->pf); |
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if (lapb_validate_nr(lapb, frame->nr)) { |
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lapb_check_iframes_acked(lapb, frame->nr); |
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} else { |
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lapb->frmr_data = *frame; |
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lapb->frmr_type = LAPB_FRMR_Z; |
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lapb_transmit_frmr(lapb); |
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lapb_dbg(0, "(%p) S3 -> S4\n", lapb->dev); |
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lapb_start_t1timer(lapb); |
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lapb_stop_t2timer(lapb); |
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lapb->state = LAPB_STATE_4; |
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lapb->n2count = 0; |
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} |
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break; |
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case LAPB_RR: |
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lapb_dbg(1, "(%p) S3 RX RR(%d) R%d\n", |
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lapb->dev, frame->pf, frame->nr); |
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lapb->condition &= ~LAPB_PEER_RX_BUSY_CONDITION; |
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lapb_check_need_response(lapb, frame->cr, frame->pf); |
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if (lapb_validate_nr(lapb, frame->nr)) { |
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lapb_check_iframes_acked(lapb, frame->nr); |
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} else { |
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lapb->frmr_data = *frame; |
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lapb->frmr_type = LAPB_FRMR_Z; |
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lapb_transmit_frmr(lapb); |
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lapb_dbg(0, "(%p) S3 -> S4\n", lapb->dev); |
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lapb_start_t1timer(lapb); |
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lapb_stop_t2timer(lapb); |
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lapb->state = LAPB_STATE_4; |
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lapb->n2count = 0; |
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} |
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break; |
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case LAPB_REJ: |
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lapb_dbg(1, "(%p) S3 RX REJ(%d) R%d\n", |
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lapb->dev, frame->pf, frame->nr); |
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lapb->condition &= ~LAPB_PEER_RX_BUSY_CONDITION; |
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lapb_check_need_response(lapb, frame->cr, frame->pf); |
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if (lapb_validate_nr(lapb, frame->nr)) { |
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lapb_frames_acked(lapb, frame->nr); |
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lapb_stop_t1timer(lapb); |
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lapb->n2count = 0; |
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lapb_requeue_frames(lapb); |
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} else { |
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lapb->frmr_data = *frame; |
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lapb->frmr_type = LAPB_FRMR_Z; |
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lapb_transmit_frmr(lapb); |
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lapb_dbg(0, "(%p) S3 -> S4\n", lapb->dev); |
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lapb_start_t1timer(lapb); |
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lapb_stop_t2timer(lapb); |
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lapb->state = LAPB_STATE_4; |
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lapb->n2count = 0; |
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} |
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break; |
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|
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case LAPB_I: |
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lapb_dbg(1, "(%p) S3 RX I(%d) S%d R%d\n", |
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lapb->dev, frame->pf, frame->ns, frame->nr); |
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if (!lapb_validate_nr(lapb, frame->nr)) { |
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lapb->frmr_data = *frame; |
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lapb->frmr_type = LAPB_FRMR_Z; |
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lapb_transmit_frmr(lapb); |
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lapb_dbg(0, "(%p) S3 -> S4\n", lapb->dev); |
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lapb_start_t1timer(lapb); |
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lapb_stop_t2timer(lapb); |
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lapb->state = LAPB_STATE_4; |
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lapb->n2count = 0; |
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break; |
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} |
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if (lapb->condition & LAPB_PEER_RX_BUSY_CONDITION) |
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lapb_frames_acked(lapb, frame->nr); |
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else |
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lapb_check_iframes_acked(lapb, frame->nr); |
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|
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if (frame->ns == lapb->vr) { |
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int cn; |
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cn = lapb_data_indication(lapb, skb); |
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queued = 1; |
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/* |
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* If upper layer has dropped the frame, we |
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* basically ignore any further protocol |
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* processing. This will cause the peer |
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* to re-transmit the frame later like |
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* a frame lost on the wire. |
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*/ |
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if (cn == NET_RX_DROP) { |
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pr_debug("rx congestion\n"); |
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break; |
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} |
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lapb->vr = (lapb->vr + 1) % modulus; |
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lapb->condition &= ~LAPB_REJECT_CONDITION; |
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if (frame->pf) |
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lapb_enquiry_response(lapb); |
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else { |
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if (!(lapb->condition & |
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LAPB_ACK_PENDING_CONDITION)) { |
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lapb->condition |= LAPB_ACK_PENDING_CONDITION; |
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lapb_start_t2timer(lapb); |
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} |
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} |
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} else { |
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if (lapb->condition & LAPB_REJECT_CONDITION) { |
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if (frame->pf) |
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lapb_enquiry_response(lapb); |
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} else { |
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lapb_dbg(1, "(%p) S3 TX REJ(%d) R%d\n", |
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lapb->dev, frame->pf, lapb->vr); |
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lapb->condition |= LAPB_REJECT_CONDITION; |
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lapb_send_control(lapb, LAPB_REJ, frame->pf, |
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LAPB_RESPONSE); |
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lapb->condition &= ~LAPB_ACK_PENDING_CONDITION; |
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} |
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} |
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break; |
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|
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case LAPB_FRMR: |
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lapb_dbg(1, "(%p) S3 RX FRMR(%d) %5ph\n", |
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lapb->dev, frame->pf, |
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skb->data); |
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lapb_establish_data_link(lapb); |
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lapb_dbg(0, "(%p) S3 -> S1\n", lapb->dev); |
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lapb_requeue_frames(lapb); |
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lapb->state = LAPB_STATE_1; |
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break; |
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|
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case LAPB_ILLEGAL: |
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lapb_dbg(1, "(%p) S3 RX ILLEGAL(%d)\n", lapb->dev, frame->pf); |
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lapb->frmr_data = *frame; |
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lapb->frmr_type = LAPB_FRMR_W; |
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lapb_transmit_frmr(lapb); |
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lapb_dbg(0, "(%p) S3 -> S4\n", lapb->dev); |
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lapb_start_t1timer(lapb); |
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lapb_stop_t2timer(lapb); |
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lapb->state = LAPB_STATE_4; |
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lapb->n2count = 0; |
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break; |
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} |
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|
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if (!queued) |
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kfree_skb(skb); |
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} |
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|
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/* |
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* State machine for state 4, Frame Reject State. |
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* The handling of the timer(s) is in file lapb_timer.c. |
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*/ |
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static void lapb_state4_machine(struct lapb_cb *lapb, struct sk_buff *skb, |
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struct lapb_frame *frame) |
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{ |
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switch (frame->type) { |
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case LAPB_SABM: |
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lapb_dbg(1, "(%p) S4 RX SABM(%d)\n", lapb->dev, frame->pf); |
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if (lapb->mode & LAPB_EXTENDED) { |
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lapb_dbg(1, "(%p) S4 TX DM(%d)\n", |
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lapb->dev, frame->pf); |
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lapb_send_control(lapb, LAPB_DM, frame->pf, |
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LAPB_RESPONSE); |
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} else { |
|
lapb_dbg(1, "(%p) S4 TX UA(%d)\n", |
|
lapb->dev, frame->pf); |
|
lapb_dbg(0, "(%p) S4 -> S3\n", lapb->dev); |
|
lapb_send_control(lapb, LAPB_UA, frame->pf, |
|
LAPB_RESPONSE); |
|
lapb_stop_t1timer(lapb); |
|
lapb_stop_t2timer(lapb); |
|
lapb->state = LAPB_STATE_3; |
|
lapb->condition = 0x00; |
|
lapb->n2count = 0; |
|
lapb->vs = 0; |
|
lapb->vr = 0; |
|
lapb->va = 0; |
|
lapb_connect_indication(lapb, LAPB_OK); |
|
} |
|
break; |
|
|
|
case LAPB_SABME: |
|
lapb_dbg(1, "(%p) S4 RX SABME(%d)\n", lapb->dev, frame->pf); |
|
if (lapb->mode & LAPB_EXTENDED) { |
|
lapb_dbg(1, "(%p) S4 TX UA(%d)\n", |
|
lapb->dev, frame->pf); |
|
lapb_dbg(0, "(%p) S4 -> S3\n", lapb->dev); |
|
lapb_send_control(lapb, LAPB_UA, frame->pf, |
|
LAPB_RESPONSE); |
|
lapb_stop_t1timer(lapb); |
|
lapb_stop_t2timer(lapb); |
|
lapb->state = LAPB_STATE_3; |
|
lapb->condition = 0x00; |
|
lapb->n2count = 0; |
|
lapb->vs = 0; |
|
lapb->vr = 0; |
|
lapb->va = 0; |
|
lapb_connect_indication(lapb, LAPB_OK); |
|
} else { |
|
lapb_dbg(1, "(%p) S4 TX DM(%d)\n", |
|
lapb->dev, frame->pf); |
|
lapb_send_control(lapb, LAPB_DM, frame->pf, |
|
LAPB_RESPONSE); |
|
} |
|
break; |
|
} |
|
|
|
kfree_skb(skb); |
|
} |
|
|
|
/* |
|
* Process an incoming LAPB frame |
|
*/ |
|
void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *skb) |
|
{ |
|
struct lapb_frame frame; |
|
|
|
if (lapb_decode(lapb, skb, &frame) < 0) { |
|
kfree_skb(skb); |
|
return; |
|
} |
|
|
|
switch (lapb->state) { |
|
case LAPB_STATE_0: |
|
lapb_state0_machine(lapb, skb, &frame); break; |
|
case LAPB_STATE_1: |
|
lapb_state1_machine(lapb, skb, &frame); break; |
|
case LAPB_STATE_2: |
|
lapb_state2_machine(lapb, skb, &frame); break; |
|
case LAPB_STATE_3: |
|
lapb_state3_machine(lapb, skb, &frame); break; |
|
case LAPB_STATE_4: |
|
lapb_state4_machine(lapb, skb, &frame); break; |
|
} |
|
|
|
lapb_kick(lapb); |
|
}
|
|
|