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TOMOYO Linux Cross Reference
Linux/net/lapb/lapb_timer.c

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  1 /*
  2  *      LAPB release 002
  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  *      LAPB 001        Jonathan Naylor Started Coding
 14  *      LAPB 002        Jonathan Naylor New timer architecture.
 15  */
 16 
 17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 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/jiffies.h>
 25 #include <linux/timer.h>
 26 #include <linux/string.h>
 27 #include <linux/sockios.h>
 28 #include <linux/net.h>
 29 #include <linux/inet.h>
 30 #include <linux/skbuff.h>
 31 #include <net/sock.h>
 32 #include <linux/uaccess.h>
 33 #include <linux/fcntl.h>
 34 #include <linux/mm.h>
 35 #include <linux/interrupt.h>
 36 #include <net/lapb.h>
 37 
 38 static void lapb_t1timer_expiry(struct timer_list *);
 39 static void lapb_t2timer_expiry(struct timer_list *);
 40 
 41 void lapb_start_t1timer(struct lapb_cb *lapb)
 42 {
 43         del_timer(&lapb->t1timer);
 44 
 45         lapb->t1timer.function = lapb_t1timer_expiry;
 46         lapb->t1timer.expires  = jiffies + lapb->t1;
 47 
 48         add_timer(&lapb->t1timer);
 49 }
 50 
 51 void lapb_start_t2timer(struct lapb_cb *lapb)
 52 {
 53         del_timer(&lapb->t2timer);
 54 
 55         lapb->t2timer.function = lapb_t2timer_expiry;
 56         lapb->t2timer.expires  = jiffies + lapb->t2;
 57 
 58         add_timer(&lapb->t2timer);
 59 }
 60 
 61 void lapb_stop_t1timer(struct lapb_cb *lapb)
 62 {
 63         del_timer(&lapb->t1timer);
 64 }
 65 
 66 void lapb_stop_t2timer(struct lapb_cb *lapb)
 67 {
 68         del_timer(&lapb->t2timer);
 69 }
 70 
 71 int lapb_t1timer_running(struct lapb_cb *lapb)
 72 {
 73         return timer_pending(&lapb->t1timer);
 74 }
 75 
 76 static void lapb_t2timer_expiry(struct timer_list *t)
 77 {
 78         struct lapb_cb *lapb = from_timer(lapb, t, t2timer);
 79 
 80         if (lapb->condition & LAPB_ACK_PENDING_CONDITION) {
 81                 lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
 82                 lapb_timeout_response(lapb);
 83         }
 84 }
 85 
 86 static void lapb_t1timer_expiry(struct timer_list *t)
 87 {
 88         struct lapb_cb *lapb = from_timer(lapb, t, t1timer);
 89 
 90         switch (lapb->state) {
 91 
 92                 /*
 93                  *      If we are a DCE, keep going DM .. DM .. DM
 94                  */
 95                 case LAPB_STATE_0:
 96                         if (lapb->mode & LAPB_DCE)
 97                                 lapb_send_control(lapb, LAPB_DM, LAPB_POLLOFF, LAPB_RESPONSE);
 98                         break;
 99 
100                 /*
101                  *      Awaiting connection state, send SABM(E), up to N2 times.
102                  */
103                 case LAPB_STATE_1:
104                         if (lapb->n2count == lapb->n2) {
105                                 lapb_clear_queues(lapb);
106                                 lapb->state = LAPB_STATE_0;
107                                 lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
108                                 lapb_dbg(0, "(%p) S1 -> S0\n", lapb->dev);
109                                 return;
110                         } else {
111                                 lapb->n2count++;
112                                 if (lapb->mode & LAPB_EXTENDED) {
113                                         lapb_dbg(1, "(%p) S1 TX SABME(1)\n",
114                                                  lapb->dev);
115                                         lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND);
116                                 } else {
117                                         lapb_dbg(1, "(%p) S1 TX SABM(1)\n",
118                                                  lapb->dev);
119                                         lapb_send_control(lapb, LAPB_SABM, LAPB_POLLON, LAPB_COMMAND);
120                                 }
121                         }
122                         break;
123 
124                 /*
125                  *      Awaiting disconnection state, send DISC, up to N2 times.
126                  */
127                 case LAPB_STATE_2:
128                         if (lapb->n2count == lapb->n2) {
129                                 lapb_clear_queues(lapb);
130                                 lapb->state = LAPB_STATE_0;
131                                 lapb_disconnect_confirmation(lapb, LAPB_TIMEDOUT);
132                                 lapb_dbg(0, "(%p) S2 -> S0\n", lapb->dev);
133                                 return;
134                         } else {
135                                 lapb->n2count++;
136                                 lapb_dbg(1, "(%p) S2 TX DISC(1)\n", lapb->dev);
137                                 lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
138                         }
139                         break;
140 
141                 /*
142                  *      Data transfer state, restransmit I frames, up to N2 times.
143                  */
144                 case LAPB_STATE_3:
145                         if (lapb->n2count == lapb->n2) {
146                                 lapb_clear_queues(lapb);
147                                 lapb->state = LAPB_STATE_0;
148                                 lapb_stop_t2timer(lapb);
149                                 lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
150                                 lapb_dbg(0, "(%p) S3 -> S0\n", lapb->dev);
151                                 return;
152                         } else {
153                                 lapb->n2count++;
154                                 lapb_requeue_frames(lapb);
155                                 lapb_kick(lapb);
156                         }
157                         break;
158 
159                 /*
160                  *      Frame reject state, restransmit FRMR frames, up to N2 times.
161                  */
162                 case LAPB_STATE_4:
163                         if (lapb->n2count == lapb->n2) {
164                                 lapb_clear_queues(lapb);
165                                 lapb->state = LAPB_STATE_0;
166                                 lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
167                                 lapb_dbg(0, "(%p) S4 -> S0\n", lapb->dev);
168                                 return;
169                         } else {
170                                 lapb->n2count++;
171                                 lapb_transmit_frmr(lapb);
172                         }
173                         break;
174         }
175 
176         lapb_start_t1timer(lapb);
177 }
178 

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