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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207// SPDX-License-Identifier: GPL-2.0-or-later/* * LAPB release 002 * * This code REQUIRES 2.1.15 or higher/ NET3.038 * * History * LAPB 001 Jonathan Naylor Started Coding * LAPB 002 Jonathan Naylor New timer architecture. */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/errno.h>#include <linux/types.h>#include <linux/socket.h>#include <linux/in.h>#include <linux/kernel.h>#include <linux/jiffies.h>#include <linux/timer.h>#include <linux/string.h>#include <linux/sockios.h>#include <linux/net.h>#include <linux/inet.h>#include <linux/skbuff.h>#include <net/sock.h>#include <linux/uaccess.h>#include <linux/fcntl.h>#include <linux/mm.h>#include <linux/interrupt.h>#include <net/lapb.h>
static void lapb_t1timer_expiry(struct timer_list *);static void lapb_t2timer_expiry(struct timer_list *);
void lapb_start_t1timer(struct lapb_cb *lapb){ timer_delete(&lapb->t1timer);
lapb->t1timer.function = lapb_t1timer_expiry; lapb->t1timer.expires = jiffies + lapb->t1;
lapb->t1timer_running = true; add_timer(&lapb->t1timer);}
void lapb_start_t2timer(struct lapb_cb *lapb){ timer_delete(&lapb->t2timer);
lapb->t2timer.function = lapb_t2timer_expiry; lapb->t2timer.expires = jiffies + lapb->t2;
lapb->t2timer_running = true; add_timer(&lapb->t2timer);}
void lapb_stop_t1timer(struct lapb_cb *lapb){ lapb->t1timer_running = false; timer_delete(&lapb->t1timer);}
void lapb_stop_t2timer(struct lapb_cb *lapb){ lapb->t2timer_running = false; timer_delete(&lapb->t2timer);}
int lapb_t1timer_running(struct lapb_cb *lapb){ return lapb->t1timer_running;}
static void lapb_t2timer_expiry(struct timer_list *t){ struct lapb_cb *lapb = timer_container_of(lapb, t, t2timer);
spin_lock_bh(&lapb->lock); if (timer_pending(&lapb->t2timer)) /* A new timer has been set up */ goto out; if (!lapb->t2timer_running) /* The timer has been stopped */ goto out;
if (lapb->condition & LAPB_ACK_PENDING_CONDITION) { lapb->condition &= ~LAPB_ACK_PENDING_CONDITION; lapb_timeout_response(lapb); } lapb->t2timer_running = false;
out: spin_unlock_bh(&lapb->lock);}
static void lapb_t1timer_expiry(struct timer_list *t){ struct lapb_cb *lapb = timer_container_of(lapb, t, t1timer);
spin_lock_bh(&lapb->lock); if (timer_pending(&lapb->t1timer)) /* A new timer has been set up */ goto out; if (!lapb->t1timer_running) /* The timer has been stopped */ goto out;
switch (lapb->state) {
/* * If we are a DCE, send DM up to N2 times, then switch to * STATE_1 and send SABM(E). */ case LAPB_STATE_0: if (lapb->mode & LAPB_DCE && lapb->n2count != lapb->n2) { lapb->n2count++; lapb_send_control(lapb, LAPB_DM, LAPB_POLLOFF, LAPB_RESPONSE); } else { lapb->state = LAPB_STATE_1; lapb_establish_data_link(lapb); } break;
/* * Awaiting connection state, send SABM(E), up to N2 times. */ case LAPB_STATE_1: if (lapb->n2count == lapb->n2) { lapb_clear_queues(lapb); lapb->state = LAPB_STATE_0; lapb_disconnect_indication(lapb, LAPB_TIMEDOUT); lapb_dbg(0, "(%p) S1 -> S0\n", lapb->dev); lapb->t1timer_running = false; goto out; } else { lapb->n2count++; if (lapb->mode & LAPB_EXTENDED) { lapb_dbg(1, "(%p) S1 TX SABME(1)\n", lapb->dev); lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND); } else { lapb_dbg(1, "(%p) S1 TX SABM(1)\n", lapb->dev); lapb_send_control(lapb, LAPB_SABM, LAPB_POLLON, LAPB_COMMAND); } } break;
/* * Awaiting disconnection state, send DISC, up to N2 times. */ case LAPB_STATE_2: if (lapb->n2count == lapb->n2) { lapb_clear_queues(lapb); lapb->state = LAPB_STATE_0; lapb_disconnect_confirmation(lapb, LAPB_TIMEDOUT); lapb_dbg(0, "(%p) S2 -> S0\n", lapb->dev); lapb->t1timer_running = false; goto out; } else { lapb->n2count++; lapb_dbg(1, "(%p) S2 TX DISC(1)\n", lapb->dev); lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND); } break;
/* * Data transfer state, restransmit I frames, up to N2 times. */ case LAPB_STATE_3: if (lapb->n2count == lapb->n2) { lapb_clear_queues(lapb); lapb->state = LAPB_STATE_0; lapb_stop_t2timer(lapb); lapb_disconnect_indication(lapb, LAPB_TIMEDOUT); lapb_dbg(0, "(%p) S3 -> S0\n", lapb->dev); lapb->t1timer_running = false; goto out; } else { lapb->n2count++; lapb_requeue_frames(lapb); lapb_kick(lapb); } break;
/* * Frame reject state, restransmit FRMR frames, up to N2 times. */ case LAPB_STATE_4: if (lapb->n2count == lapb->n2) { lapb_clear_queues(lapb); lapb->state = LAPB_STATE_0; lapb_disconnect_indication(lapb, LAPB_TIMEDOUT); lapb_dbg(0, "(%p) S4 -> S0\n", lapb->dev); lapb->t1timer_running = false; goto out; } else { lapb->n2count++; lapb_transmit_frmr(lapb); } break; }
lapb_start_t1timer(lapb);
out: spin_unlock_bh(&lapb->lock);}