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 35#include <net/irda/irda.h> 36#include <net/irda/irlmp.h> 37#include <net/irda/iriap.h> 38#include <net/irda/irda_device.h> /* struct irda_skb_cb */ 39 40#include <net/irda/ircomm_event.h> 41#include <net/irda/ircomm_lmp.h> 42 43 44/* 45 * Function ircomm_lmp_connect_request (self, userdata) 46 * 47 * 48 * 49 */ 50static int ircomm_lmp_connect_request(struct ircomm_cb *self, 51 struct sk_buff *userdata, 52 struct ircomm_info *info) 53{ 54 int ret = 0; 55 56 IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); 57 58 /* Don't forget to refcount it - should be NULL anyway */ 59 if(userdata) 60 skb_get(userdata); 61 62 ret = irlmp_connect_request(self->lsap, info->dlsap_sel, 63 info->saddr, info->daddr, NULL, userdata); 64 return ret; 65} 66 67/* 68 * Function ircomm_lmp_connect_response (self, skb) 69 * 70 * 71 * 72 */ 73static int ircomm_lmp_connect_response(struct ircomm_cb *self, 74 struct sk_buff *userdata) 75{ 76 struct sk_buff *tx_skb; 77 int ret; 78 79 IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); 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 ret = irlmp_connect_response(self->lsap, tx_skb); 103 104 return 0; 105} 106 107static int ircomm_lmp_disconnect_request(struct ircomm_cb *self, 108 struct sk_buff *userdata, 109 struct ircomm_info *info) 110{ 111 struct sk_buff *tx_skb; 112 int ret; 113 114 IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); 115 116 if (!userdata) { 117 tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC); 118 if (!tx_skb) 119 return -ENOMEM; 120 121 /* Reserve space for MUX and LAP header */ 122 skb_reserve(tx_skb, LMP_MAX_HEADER); 123 userdata = tx_skb; 124 } else { 125 /* Don't forget to refcount it - should be NULL anyway */ 126 skb_get(userdata); 127 } 128 129 ret = irlmp_disconnect_request(self->lsap, userdata); 130 131 return ret; 132} 133 134/* 135 * Function ircomm_lmp_flow_control (skb) 136 * 137 * This function is called when a data frame we have sent to IrLAP has 138 * been deallocated. We do this to make sure we don't flood IrLAP with 139 * frames, since we are not using the IrTTP flow control mechanism 140 */ 141static void ircomm_lmp_flow_control(struct sk_buff *skb) 142{ 143 struct irda_skb_cb *cb; 144 struct ircomm_cb *self; 145 int line; 146 147 IRDA_ASSERT(skb != NULL, return;); 148 149 cb = (struct irda_skb_cb *) skb->cb; 150 151 IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); 152 153 line = cb->line; 154 155 self = (struct ircomm_cb *) hashbin_lock_find(ircomm, line, NULL); 156 if (!self) { 157 IRDA_DEBUG(2, "%s(), didn't find myself\n", __FUNCTION__ ); 158 return; 159 } 160 161 IRDA_ASSERT(self != NULL, return;); 162 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;); 163 164 self->pkt_count--; 165 166 if ((self->pkt_count < 2) && (self->flow_status == FLOW_STOP)) { 167 IRDA_DEBUG(2, "%s(), asking TTY to start again!\n", __FUNCTION__ ); 168 self->flow_status = FLOW_START; 169 if (self->notify.flow_indication) 170 self->notify.flow_indication(self->notify.instance, 171 self, FLOW_START); 172 } 173} 174 175/* 176 * Function ircomm_lmp_data_request (self, userdata) 177 * 178 * Send data frame to peer device 179 * 180 */ 181static int ircomm_lmp_data_request(struct ircomm_cb *self, 182 struct sk_buff *skb, 183 int not_used) 184{ 185 struct irda_skb_cb *cb; 186 int ret; 187 188 IRDA_ASSERT(skb != NULL, return -1;); 189 190 cb = (struct irda_skb_cb *) skb->cb; 191 192 cb->line = self->line; 193 194 IRDA_DEBUG(4, "%s(), sending frame\n", __FUNCTION__ ); 195 196 /* Don't forget to refcount it - see ircomm_tty_do_softint() */ 197 skb_get(skb); 198 199 skb->destructor = ircomm_lmp_flow_control; 200 201 if ((self->pkt_count++ > 7) && (self->flow_status == FLOW_START)) { 202 IRDA_DEBUG(2, "%s(), asking TTY to slow down!\n", __FUNCTION__ ); 203 self->flow_status = FLOW_STOP; 204 if (self->notify.flow_indication) 205 self->notify.flow_indication(self->notify.instance, 206 self, FLOW_STOP); 207 } 208 ret = irlmp_data_request(self->lsap, skb); 209 if (ret) { 210 IRDA_ERROR("%s(), failed\n", __FUNCTION__); 211 /* irlmp_data_request already free the packet */ 212 } 213 214 return ret; 215} 216 217/* 218 * Function ircomm_lmp_data_indication (instance, sap, skb) 219 * 220 * Incoming data which we must deliver to the state machine, to check 221 * we are still connected. 222 */ 223static int ircomm_lmp_data_indication(void *instance, void *sap, 224 struct sk_buff *skb) 225{ 226 struct ircomm_cb *self = (struct ircomm_cb *) instance; 227 228 IRDA_DEBUG(4, "%s()\n", __FUNCTION__ ); 229 230 IRDA_ASSERT(self != NULL, return -1;); 231 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;); 232 IRDA_ASSERT(skb != NULL, return -1;); 233 234 ircomm_do_event(self, IRCOMM_LMP_DATA_INDICATION, skb, NULL); 235 236 /* Drop reference count - see ircomm_tty_data_indication(). */ 237 dev_kfree_skb(skb); 238 239 return 0; 240} 241 242/* 243 * Function ircomm_lmp_connect_confirm (instance, sap, qos, max_sdu_size, 244 * max_header_size, skb) 245 * 246 * Connection has been confirmed by peer device 247 * 248 */ 249static void ircomm_lmp_connect_confirm(void *instance, void *sap, 250 struct qos_info *qos, 251 __u32 max_seg_size, 252 __u8 max_header_size, 253 struct sk_buff *skb) 254{ 255 struct ircomm_cb *self = (struct ircomm_cb *) instance; 256 struct ircomm_info info; 257 258 IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); 259 260 IRDA_ASSERT(self != NULL, return;); 261 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;); 262 IRDA_ASSERT(skb != NULL, return;); 263 IRDA_ASSERT(qos != NULL, return;); 264 265 info.max_data_size = max_seg_size; 266 info.max_header_size = max_header_size; 267 info.qos = qos; 268 269 ircomm_do_event(self, IRCOMM_LMP_CONNECT_CONFIRM, skb, &info); 270 271 /* Drop reference count - see ircomm_tty_connect_confirm(). */ 272 dev_kfree_skb(skb); 273} 274 275/* 276 * Function ircomm_lmp_connect_indication (instance, sap, qos, max_sdu_size, 277 * max_header_size, skb) 278 * 279 * Peer device wants to make a connection with us 280 * 281 */ 282static void ircomm_lmp_connect_indication(void *instance, void *sap, 283 struct qos_info *qos, 284 __u32 max_seg_size, 285 __u8 max_header_size, 286 struct sk_buff *skb) 287{ 288 struct ircomm_cb *self = (struct ircomm_cb *)instance; 289 struct ircomm_info info; 290 291 IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); 292 293 IRDA_ASSERT(self != NULL, return;); 294 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;); 295 IRDA_ASSERT(skb != NULL, return;); 296 IRDA_ASSERT(qos != NULL, return;); 297 298 info.max_data_size = max_seg_size; 299 info.max_header_size = max_header_size; 300 info.qos = qos; 301 302 ircomm_do_event(self, IRCOMM_LMP_CONNECT_INDICATION, skb, &info); 303 304 /* Drop reference count - see ircomm_tty_connect_indication(). */ 305 dev_kfree_skb(skb); 306} 307 308/* 309 * Function ircomm_lmp_disconnect_indication (instance, sap, reason, skb) 310 * 311 * Peer device has closed the connection, or the link went down for some 312 * other reason 313 */ 314static void ircomm_lmp_disconnect_indication(void *instance, void *sap, 315 LM_REASON reason, 316 struct sk_buff *skb) 317{ 318 struct ircomm_cb *self = (struct ircomm_cb *) instance; 319 struct ircomm_info info; 320 321 IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); 322 323 IRDA_ASSERT(self != NULL, return;); 324 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;); 325 326 info.reason = reason; 327 328 ircomm_do_event(self, IRCOMM_LMP_DISCONNECT_INDICATION, skb, &info); 329 330 /* Drop reference count - see ircomm_tty_disconnect_indication(). */ 331 if(skb) 332 dev_kfree_skb(skb); 333} 334/* 335 * Function ircomm_open_lsap (self) 336 * 337 * Open LSAP. This function will only be used when using "raw" services 338 * 339 */ 340int ircomm_open_lsap(struct ircomm_cb *self) 341{ 342 notify_t notify; 343 344 IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); 345 346 /* Register callbacks */ 347 irda_notify_init(¬ify); 348 notify.data_indication = ircomm_lmp_data_indication; 349 notify.connect_confirm = ircomm_lmp_connect_confirm; 350 notify.connect_indication = ircomm_lmp_connect_indication; 351 notify.disconnect_indication = ircomm_lmp_disconnect_indication; 352 notify.instance = self; 353 strlcpy(notify.name, "IrCOMM", sizeof(notify.name)); 354 355 self->lsap = irlmp_open_lsap(LSAP_ANY, ¬ify, 0); 356 if (!self->lsap) { 357 IRDA_DEBUG(0,"%sfailed to allocate tsap\n", __FUNCTION__ ); 358 return -1; 359 } 360 self->slsap_sel = self->lsap->slsap_sel; 361 362 /* 363 * Initialize the call-table for issuing commands 364 */ 365 self->issue.data_request = ircomm_lmp_data_request; 366 self->issue.connect_request = ircomm_lmp_connect_request; 367 self->issue.connect_response = ircomm_lmp_connect_response; 368 self->issue.disconnect_request = ircomm_lmp_disconnect_request; 369 370 return 0; 371} 372