drivers/isdn/pcbit/callbacks.c

   1 /*
   2  * Callbacks for the FSM
   3  *
   4  * Copyright (C) 1996 Universidade de Lisboa
   5  *
   6  * Written by Pedro Roque Marques (roque@di.fc.ul.pt)
   7  *
   8  * This software may be used and distributed according to the terms of
   9  * the GNU General Public License, incorporated herein by reference.
  10  */
  11
  12 /*
  13  * Fix: 19981230 - Carlos Morgado <chbm@techie.com>
  14  * Port of Nelson Escravana's <nelson.escravana@usa.net> fix to CalledPN
  15  * NULL pointer dereference in cb_in_1 (originally fixed in 2.0)
  16  */
  17
  18 #include <linux/sched.h>
  19 #include <linux/string.h>
  20 #include <linux/kernel.h>
  21
  22 #include <linux/types.h>
  23 #include <linux/slab.h>
  24 #include <linux/mm.h>
  25 #include <linux/skbuff.h>
  26
  27 #include <asm/io.h>
  28
  29 #include <linux/isdnif.h>
  30
  31 #include "pcbit.h"
  32 #include "layer2.h"
  33 #include "edss1.h"
  34 #include "callbacks.h"
  35 #include "capi.h"
  36
  37 ushort last_ref_num = 1;
  38
  39 /*
  40  *  send_conn_req
  41  *
  42  */
  43
  44 void cb_out_1(struct pcbit_dev * dev, struct pcbit_chan* chan,
  45               struct callb_data *cbdata)
  46 {
  47         struct sk_buff *skb;
  48         int len;
  49         ushort refnum;
  50
  51
  52 #ifdef DEBUG
  53         printk(KERN_DEBUG "Called Party Number: %s\n",
  54                cbdata->data.setup.CalledPN);
  55 #endif
  56         /*
  57          * hdr - kmalloc in capi_conn_req
  58          *     - kfree   when msg has been sent
  59          */
  60
  61         if ((len = capi_conn_req(cbdata->data.setup.CalledPN, &skb,
  62                                  chan->proto)) < 0)
  63         {
  64                 printk("capi_conn_req failed\n");
  65                 return;
  66         }
  67
  68
  69         refnum = last_ref_num++ & 0x7fffU;
  70
  71         chan->callref = 0;
  72         chan->layer2link = 0;
  73         chan->snum = 0;
  74         chan->s_refnum = refnum;
  75
  76         pcbit_l2_write(dev, MSG_CONN_REQ, refnum, skb, len);
  77 }
  78
  79 /*
  80  *  rcv CONNECT
  81  *  will go into ACTIVE state
  82  *  send CONN_ACTIVE_RESP
  83  *  send Select protocol request
  84  */
  85
  86 void cb_out_2(struct pcbit_dev * dev, struct pcbit_chan* chan,
  87               struct callb_data *data)
  88 {
  89         isdn_ctrl ictl;
  90         struct sk_buff *skb;
  91         int len;
  92         ushort refnum;
  93
  94         if ((len=capi_conn_active_resp(chan, &skb)) < 0)
  95         {
  96                 printk("capi_conn_active_req failed\n");
  97                 return;
  98         }
  99
 100         refnum = last_ref_num++ & 0x7fffU;
 101         chan->s_refnum = refnum;
 102
 103         pcbit_l2_write(dev, MSG_CONN_ACTV_RESP, refnum, skb, len);
 104
 105
 106         ictl.command = ISDN_STAT_DCONN;
 107         ictl.driver=dev->id;
 108         ictl.arg=chan->id;
 109         dev->dev_if->statcallb(&ictl);
 110
 111         /* ACTIVE D-channel */
 112
 113         /* Select protocol  */
 114
 115         if ((len=capi_select_proto_req(chan, &skb, 1 /*outgoing*/)) < 0) {
 116                 printk("capi_select_proto_req failed\n");
 117                 return;
 118         }
 119
 120         refnum = last_ref_num++ & 0x7fffU;
 121         chan->s_refnum = refnum;
 122
 123         pcbit_l2_write(dev, MSG_SELP_REQ, refnum, skb, len);
 124 }
 125
 126
 127 /*
 128  * Incoming call received
 129  * inform user
 130  */
 131
 132 void cb_in_1(struct pcbit_dev * dev, struct pcbit_chan* chan,
 133              struct callb_data *cbdata)
 134 {
 135         isdn_ctrl ictl;
 136         unsigned short refnum;
 137         struct sk_buff *skb;
 138         int len;
 139
 140
 141         ictl.command = ISDN_STAT_ICALL;
 142         ictl.driver=dev->id;
 143         ictl.arg=chan->id;
 144
 145         /*
 146          *  ictl.num >= strlen() + strlen() + 5
 147          */
 148
 149         if (cbdata->data.setup.CallingPN == NULL) {
 150                 printk(KERN_DEBUG "NULL CallingPN to phone; using 0\n");
 151                 strcpy(ictl.parm.setup.phone, "0");
 152         }
 153         else {
 154                 strcpy(ictl.parm.setup.phone, cbdata->data.setup.CallingPN);
 155         }
 156         if (cbdata->data.setup.CalledPN == NULL) {
 157                 printk(KERN_DEBUG "NULL CalledPN to eazmsn; using 0\n");
 158                 strcpy(ictl.parm.setup.eazmsn, "0");
 159         }
 160         else {
 161                 strcpy(ictl.parm.setup.eazmsn, cbdata->data.setup.CalledPN);
 162         }
 163         ictl.parm.setup.si1 = 7;
 164         ictl.parm.setup.si2 = 0;
 165         ictl.parm.setup.plan = 0;
 166         ictl.parm.setup.screen = 0;
 167
 168 #ifdef DEBUG
 169         printk(KERN_DEBUG "statstr: %s\n", ictl.num);
 170 #endif
 171
 172         dev->dev_if->statcallb(&ictl);
 173
 174
 175         if ((len=capi_conn_resp(chan, &skb)) < 0) {
 176                 printk(KERN_DEBUG "capi_conn_resp failed\n");
 177                 return;
 178         }
 179
 180         refnum = last_ref_num++ & 0x7fffU;
 181         chan->s_refnum = refnum;
 182
 183         pcbit_l2_write(dev, MSG_CONN_RESP, refnum, skb, len);
 184 }
 185
 186 /*
 187  * user has replied
 188  * open the channel
 189  * send CONNECT message CONNECT_ACTIVE_REQ in CAPI
 190  */
 191
 192 void cb_in_2(struct pcbit_dev * dev, struct pcbit_chan* chan,
 193              struct callb_data *data)
 194 {
 195         unsigned short refnum;
 196         struct sk_buff *skb;
 197         int len;
 198
 199         if ((len = capi_conn_active_req(chan, &skb)) < 0) {
 200                 printk(KERN_DEBUG "capi_conn_active_req failed\n");
 201                 return;
 202         }
 203
 204
 205         refnum = last_ref_num++ & 0x7fffU;
 206         chan->s_refnum = refnum;
 207
 208         printk(KERN_DEBUG "sending MSG_CONN_ACTV_REQ\n");
 209         pcbit_l2_write(dev, MSG_CONN_ACTV_REQ, refnum, skb, len);
 210 }
 211
 212 /*
 213  * CONN_ACK arrived
 214  * start b-proto selection
 215  *
 216  */
 217
 218 void cb_in_3(struct pcbit_dev * dev, struct pcbit_chan* chan,
 219              struct callb_data *data)
 220 {
 221         unsigned short refnum;
 222         struct sk_buff *skb;
 223         int len;
 224
 225         if ((len = capi_select_proto_req(chan, &skb, 0 /*incoming*/)) < 0)
 226         {
 227                 printk("capi_select_proto_req failed\n");
 228                 return;
 229         }
 230
 231         refnum = last_ref_num++ & 0x7fffU;
 232         chan->s_refnum = refnum;
 233
 234         pcbit_l2_write(dev, MSG_SELP_REQ, refnum, skb, len);
 235
 236 }
 237
 238
 239 /*
 240  * Received disconnect ind on active state
 241  * send disconnect resp
 242  * send msg to user
 243  */
 244 void cb_disc_1(struct pcbit_dev * dev, struct pcbit_chan* chan,
 245                struct callb_data *data)
 246 {
 247         struct sk_buff *skb;
 248         int len;
 249         ushort refnum;
 250         isdn_ctrl ictl;
 251
 252         if ((len = capi_disc_resp(chan, &skb)) < 0) {
 253                 printk("capi_disc_resp failed\n");
 254                 return;
 255         }
 256
 257         refnum = last_ref_num++ & 0x7fffU;
 258         chan->s_refnum = refnum;
 259
 260         pcbit_l2_write(dev, MSG_DISC_RESP, refnum, skb, len);
 261
 262         ictl.command = ISDN_STAT_BHUP;
 263         ictl.driver=dev->id;
 264         ictl.arg=chan->id;
 265         dev->dev_if->statcallb(&ictl);
 266 }
 267
 268
 269 /*
 270  *  User HANGUP on active/call proceeding state
 271  *  send disc.req
 272  */
 273 void cb_disc_2(struct pcbit_dev * dev, struct pcbit_chan* chan,
 274                struct callb_data *data)
 275 {
 276         struct sk_buff *skb;
 277         int len;
 278         ushort refnum;
 279
 280         if ((len = capi_disc_req(chan->callref, &skb, CAUSE_NORMAL)) < 0)
 281         {
 282                 printk("capi_disc_req failed\n");
 283                 return;
 284         }
 285
 286         refnum = last_ref_num++ & 0x7fffU;
 287         chan->s_refnum = refnum;
 288
 289         pcbit_l2_write(dev, MSG_DISC_REQ, refnum, skb, len);
 290 }
 291
 292 /*
 293  *  Disc confirm received send BHUP
 294  *  Problem: when the HL driver sends the disc req itself
 295  *           LL receives BHUP
 296  */
 297 void cb_disc_3(struct pcbit_dev * dev, struct pcbit_chan* chan,
 298                struct callb_data *data)
 299 {
 300         isdn_ctrl ictl;
 301
 302         ictl.command = ISDN_STAT_BHUP;
 303         ictl.driver=dev->id;
 304         ictl.arg=chan->id;
 305         dev->dev_if->statcallb(&ictl);
 306 }
 307
 308 void cb_notdone(struct pcbit_dev * dev, struct pcbit_chan* chan,
 309                 struct callb_data *data)
 310 {
 311 }
 312
 313 /*
 314  * send activate b-chan protocol
 315  */
 316 void cb_selp_1(struct pcbit_dev * dev, struct pcbit_chan* chan,
 317                struct callb_data *data)
 318 {
 319         struct sk_buff *skb;
 320         int len;
 321         ushort refnum;
 322
 323         if ((len = capi_activate_transp_req(chan, &skb)) < 0)
 324         {
 325                 printk("capi_conn_activate_transp_req failed\n");
 326                 return;
 327         }
 328
 329         refnum = last_ref_num++ & 0x7fffU;
 330         chan->s_refnum = refnum;
 331
 332         pcbit_l2_write(dev, MSG_ACT_TRANSP_REQ, refnum, skb, len);
 333 }
 334
 335 /*
 336  *  Inform User that the B-channel is available
 337  */
 338 void cb_open(struct pcbit_dev * dev, struct pcbit_chan* chan,
 339              struct callb_data *data)
 340 {
 341         isdn_ctrl ictl;
 342
 343         ictl.command = ISDN_STAT_BCONN;
 344         ictl.driver=dev->id;
 345         ictl.arg=chan->id;
 346         dev->dev_if->statcallb(&ictl);
 347 }
 348
 349
 350