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