1/********************************************************************* 2 * 3 * Filename: ircomm_lmp.c 4 * Version: 1.0 5 * Description: Interface between IrCOMM and IrLMP 6 * Status: Stable 7 * Author: Dag Brattli <dagb@cs.uit.no> 8 * Created at: Sun Jun 6 20:48:27 1999 9 * Modified at: Sun Dec 12 13:44:17 1999 10 * Modified by: Dag Brattli <dagb@cs.uit.no> 11 * Sources: Previous IrLPT work by Thomas Davis 12 * 13 * Copyright (c) 1999 Dag Brattli, All Rights Reserved. 14 * Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com> 15 * 16 * This program is free software; you can redistribute it and/or 17 * modify it under the terms of the GNU General Public License as 18 * published by the Free Software Foundation; either version 2 of 19 * the License, or (at your option) any later version. 20 * 21 * This program is distributed in the hope that it will be useful, 22 * but WITHOUT ANY WARRANTY; without even the implied warranty of 23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 24 * GNU General Public License for more details. 25 * 26 * You should have received a copy of the GNU General Public License 27 * along with this program; if not, write to the Free Software 28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 29 * MA 02111-1307 USA 30 * 31 ********************************************************************/ 32 33#include <linux/init.h> 34#include <linux/gfp.h> 35 36#include <net/irda/irda.h> 37#include <net/irda/irlmp.h> 38#include <net/irda/iriap.h> 39#include <net/irda/irda_device.h> /* struct irda_skb_cb */ 40 41#include <net/irda/ircomm_event.h> 42#include <net/irda/ircomm_lmp.h> 43 44 45/* 46 * Function ircomm_lmp_connect_request (self, userdata) 47 * 48 * 49 * 50 */ 51static int ircomm_lmp_connect_request(struct ircomm_cb *self, 52 struct sk_buff *userdata, 53 struct ircomm_info *info) 54{ 55 int ret = 0; 56 57 IRDA_DEBUG(0, "%s()\n", __func__ ); 58 59 /* Don't forget to refcount it - should be NULL anyway */ 60 if(userdata) 61 skb_get(userdata); 62 63 ret = irlmp_connect_request(self->lsap, info->dlsap_sel, 64 info->saddr, info->daddr, NULL, userdata); 65 return ret; 66} 67 68/* 69 * Function ircomm_lmp_connect_response (self, skb) 70 * 71 * 72 * 73 */ 74static int ircomm_lmp_connect_response(struct ircomm_cb *self, 75 struct sk_buff *userdata) 76{ 77 struct sk_buff *tx_skb; 78 79 IRDA_DEBUG(0, "%s()\n", __func__ ); 80 81 /* Any userdata supplied? */ 82 if (userdata == NULL) { 83 tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC); 84 if (!tx_skb) 85 return -ENOMEM; 86 87 /* Reserve space for MUX and LAP header */ 88 skb_reserve(tx_skb, LMP_MAX_HEADER); 89 } else { 90 /* 91 * Check that the client has reserved enough space for 92 * headers 93 */ 94 IRDA_ASSERT(skb_headroom(userdata) >= LMP_MAX_HEADER, 95 return -1;); 96 97 /* Don't forget to refcount it - should be NULL anyway */ 98 skb_get(userdata); 99 tx_skb = userdata; 100 } 101 102 return irlmp_connect_response(self->lsap, tx_skb); 103} 104 105static int ircomm_lmp_disconnect_request(struct ircomm_cb *self, 106 struct sk_buff *userdata, 107 struct ircomm_info *info) 108{ 109 struct sk_buff *tx_skb; 110 int ret; 111 112 IRDA_DEBUG(0, "%s()\n", __func__ ); 113 114 if (!userdata) { 115 tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC); 116 if (!tx_skb) 117 return -ENOMEM; 118 119 /* Reserve space for MUX and LAP header */ 120 skb_reserve(tx_skb, LMP_MAX_HEADER); 121 userdata = tx_skb; 122 } else { 123 /* Don't forget to refcount it - should be NULL anyway */ 124 skb_get(userdata); 125 } 126 127 ret = irlmp_disconnect_request(self->lsap, userdata); 128 129 return ret; 130} 131 132/* 133 * Function ircomm_lmp_flow_control (skb) 134 * 135 * This function is called when a data frame we have sent to IrLAP has 136 * been deallocated. We do this to make sure we don't flood IrLAP with 137 * frames, since we are not using the IrTTP flow control mechanism 138 */ 139static void ircomm_lmp_flow_control(struct sk_buff *skb) 140{ 141 struct irda_skb_cb *cb; 142 struct ircomm_cb *self; 143 int line; 144 145 IRDA_ASSERT(skb != NULL, return;); 146 147 cb = (struct irda_skb_cb *) skb->cb; 148 149 IRDA_DEBUG(2, "%s()\n", __func__ ); 150 151 line = cb->line; 152 153 self = (struct ircomm_cb *) hashbin_lock_find(ircomm, line, NULL); 154 if (!self) { 155 IRDA_DEBUG(2, "%s(), didn't find myself\n", __func__ ); 156 return; 157 } 158 159 IRDA_ASSERT(self != NULL, return;); 160 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;); 161 162 self->pkt_count--; 163 164 if ((self->pkt_count < 2) && (self->flow_status == FLOW_STOP)) { 165 IRDA_DEBUG(2, "%s(), asking TTY to start again!\n", __func__ ); 166 self->flow_status = FLOW_START; 167 if (self->notify.flow_indication) 168 self->notify.flow_indication(self->notify.instance, 169 self, FLOW_START); 170 } 171} 172 173/* 174 * Function ircomm_lmp_data_request (self, userdata) 175 * 176 * Send data frame to peer device 177 * 178 */ 179static int ircomm_lmp_data_request(struct ircomm_cb *self, 180 struct sk_buff *skb, 181 int not_used) 182{ 183 struct irda_skb_cb *cb; 184 int ret; 185 186 IRDA_ASSERT(skb != NULL, return -1;); 187 188 cb = (struct irda_skb_cb *) skb->cb; 189 190 cb->line = self->line; 191 192 IRDA_DEBUG(4, "%s(), sending frame\n", __func__ ); 193 194 /* Don't forget to refcount it - see ircomm_tty_do_softint() */ 195 skb_get(skb); 196 197 skb_orphan(skb); 198 skb->destructor = ircomm_lmp_flow_control; 199 200 if ((self->pkt_count++ > 7) && (self->flow_status == FLOW_START)) { 201 IRDA_DEBUG(2, "%s(), asking TTY to slow down!\n", __func__ ); 202 self->flow_status = FLOW_STOP; 203 if (self->notify.flow_indication) 204 self->notify.flow_indication(self->notify.instance, 205 self, FLOW_STOP); 206 } 207 ret = irlmp_data_request(self->lsap, skb); 208 if (ret) { 209 IRDA_ERROR("%s(), failed\n", __func__); 210 /* irlmp_data_request already free the packet */ 211 } 212 213 return ret; 214} 215 216/* 217 * Function ircomm_lmp_data_indication (instance, sap, skb) 218 * 219 * Incoming data which we must deliver to the state machine, to check 220 * we are still connected. 221 */ 222static int ircomm_lmp_data_indication(void *instance, void *sap, 223 struct sk_buff *skb) 224{ 225 struct ircomm_cb *self = (struct ircomm_cb *) instance; 226 227 IRDA_DEBUG(4, "%s()\n", __func__ ); 228 229 IRDA_ASSERT(self != NULL, return -1;); 230 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;); 231 IRDA_ASSERT(skb != NULL, return -1;); 232 233 ircomm_do_event(self, IRCOMM_LMP_DATA_INDICATION, skb, NULL); 234 235 /* Drop reference count - see ircomm_tty_data_indication(). */ 236 dev_kfree_skb(skb); 237 238 return 0; 239} 240 241/* 242 * Function ircomm_lmp_connect_confirm (instance, sap, qos, max_sdu_size, 243 * max_header_size, skb) 244 * 245 * Connection has been confirmed by peer device 246 * 247 */ 248static void ircomm_lmp_connect_confirm(void *instance, void *sap, 249 struct qos_info *qos, 250 __u32 max_seg_size, 251 __u8 max_header_size, 252 struct sk_buff *skb) 253{ 254 struct ircomm_cb *self = (struct ircomm_cb *) instance; 255 struct ircomm_info info; 256 257 IRDA_DEBUG(0, "%s()\n", __func__ ); 258 259 IRDA_ASSERT(self != NULL, return;); 260 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;); 261 IRDA_ASSERT(skb != NULL, return;); 262 IRDA_ASSERT(qos != NULL, return;); 263 264 info.max_data_size = max_seg_size; 265 info.max_header_size = max_header_size; 266 info.qos = qos; 267 268 ircomm_do_event(self, IRCOMM_LMP_CONNECT_CONFIRM, skb, &info); 269 270 /* Drop reference count - see ircomm_tty_connect_confirm(). */ 271 dev_kfree_skb(skb); 272} 273 274/* 275 * Function ircomm_lmp_connect_indication (instance, sap, qos, max_sdu_size, 276 * max_header_size, skb) 277 * 278 * Peer device wants to make a connection with us 279 * 280 */ 281static void ircomm_lmp_connect_indication(void *instance, void *sap, 282 struct qos_info *qos, 283 __u32 max_seg_size, 284 __u8 max_header_size, 285 struct sk_buff *skb) 286{ 287 struct ircomm_cb *self = (struct ircomm_cb *)instance; 288 struct ircomm_info info; 289 290 IRDA_DEBUG(0, "%s()\n", __func__ ); 291 292 IRDA_ASSERT(self != NULL, return;); 293 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;); 294 IRDA_ASSERT(skb != NULL, return;); 295 IRDA_ASSERT(qos != NULL, return;); 296 297 info.max_data_size = max_seg_size; 298 info.max_header_size = max_header_size; 299 info.qos = qos; 300 301 ircomm_do_event(self, IRCOMM_LMP_CONNECT_INDICATION, skb, &info); 302 303 /* Drop reference count - see ircomm_tty_connect_indication(). */ 304 dev_kfree_skb(skb); 305} 306 307/* 308 * Function ircomm_lmp_disconnect_indication (instance, sap, reason, skb) 309 * 310 * Peer device has closed the connection, or the link went down for some 311 * other reason 312 */ 313static void ircomm_lmp_disconnect_indication(void *instance, void *sap, 314 LM_REASON reason, 315 struct sk_buff *skb) 316{ 317 struct ircomm_cb *self = (struct ircomm_cb *) instance; 318 struct ircomm_info info; 319 320 IRDA_DEBUG(0, "%s()\n", __func__ ); 321 322 IRDA_ASSERT(self != NULL, return;); 323 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;); 324 325 info.reason = reason; 326 327 ircomm_do_event(self, IRCOMM_LMP_DISCONNECT_INDICATION, skb, &info); 328 329 /* Drop reference count - see ircomm_tty_disconnect_indication(). */ 330 if(skb) 331 dev_kfree_skb(skb); 332} 333/* 334 * Function ircomm_open_lsap (self) 335 * 336 * Open LSAP. This function will only be used when using "raw" services 337 * 338 */ 339int ircomm_open_lsap(struct ircomm_cb *self) 340{ 341 notify_t notify; 342 343 IRDA_DEBUG(0, "%s()\n", __func__ ); 344 345 /* Register callbacks */ 346 irda_notify_init(¬ify); 347 notify.data_indication = ircomm_lmp_data_indication; 348 notify.connect_confirm = ircomm_lmp_connect_confirm; 349 notify.connect_indication = ircomm_lmp_connect_indication; 350 notify.disconnect_indication = ircomm_lmp_disconnect_indication; 351 notify.instance = self; 352 strlcpy(notify.name, "IrCOMM", sizeof(notify.name)); 353 354 self->lsap = irlmp_open_lsap(LSAP_ANY, ¬ify, 0); 355 if (!self->lsap) { 356 IRDA_DEBUG(0,"%sfailed to allocate tsap\n", __func__ ); 357 return -1; 358 } 359 self->slsap_sel = self->lsap->slsap_sel; 360 361 /* 362 * Initialize the call-table for issuing commands 363 */ 364 self->issue.data_request = ircomm_lmp_data_request; 365 self->issue.connect_request = ircomm_lmp_connect_request; 366 self->issue.connect_response = ircomm_lmp_connect_response; 367 self->issue.disconnect_request = ircomm_lmp_disconnect_request; 368 369 return 0; 370} 371