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, see <http://www.gnu.org/licenses/>. 28 * 29 ********************************************************************/ 30 31#include <linux/init.h> 32#include <linux/gfp.h> 33 34#include <net/irda/irda.h> 35#include <net/irda/irlmp.h> 36#include <net/irda/iriap.h> 37#include <net/irda/irda_device.h> /* struct irda_skb_cb */ 38 39#include <net/irda/ircomm_event.h> 40#include <net/irda/ircomm_lmp.h> 41 42 43/* 44 * Function ircomm_lmp_connect_request (self, userdata) 45 * 46 * 47 * 48 */ 49static int ircomm_lmp_connect_request(struct ircomm_cb *self, 50 struct sk_buff *userdata, 51 struct ircomm_info *info) 52{ 53 int ret = 0; 54 55 /* Don't forget to refcount it - should be NULL anyway */ 56 if(userdata) 57 skb_get(userdata); 58 59 ret = irlmp_connect_request(self->lsap, info->dlsap_sel, 60 info->saddr, info->daddr, NULL, userdata); 61 return ret; 62} 63 64/* 65 * Function ircomm_lmp_connect_response (self, skb) 66 * 67 * 68 * 69 */ 70static int ircomm_lmp_connect_response(struct ircomm_cb *self, 71 struct sk_buff *userdata) 72{ 73 struct sk_buff *tx_skb; 74 75 /* Any userdata supplied? */ 76 if (userdata == NULL) { 77 tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC); 78 if (!tx_skb) 79 return -ENOMEM; 80 81 /* Reserve space for MUX and LAP header */ 82 skb_reserve(tx_skb, LMP_MAX_HEADER); 83 } else { 84 /* 85 * Check that the client has reserved enough space for 86 * headers 87 */ 88 IRDA_ASSERT(skb_headroom(userdata) >= LMP_MAX_HEADER, 89 return -1;); 90 91 /* Don't forget to refcount it - should be NULL anyway */ 92 skb_get(userdata); 93 tx_skb = userdata; 94 } 95 96 return irlmp_connect_response(self->lsap, tx_skb); 97} 98 99static int ircomm_lmp_disconnect_request(struct ircomm_cb *self, 100 struct sk_buff *userdata, 101 struct ircomm_info *info) 102{ 103 struct sk_buff *tx_skb; 104 int ret; 105 106 if (!userdata) { 107 tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC); 108 if (!tx_skb) 109 return -ENOMEM; 110 111 /* Reserve space for MUX and LAP header */ 112 skb_reserve(tx_skb, LMP_MAX_HEADER); 113 userdata = tx_skb; 114 } else { 115 /* Don't forget to refcount it - should be NULL anyway */ 116 skb_get(userdata); 117 } 118 119 ret = irlmp_disconnect_request(self->lsap, userdata); 120 121 return ret; 122} 123 124/* 125 * Function ircomm_lmp_flow_control (skb) 126 * 127 * This function is called when a data frame we have sent to IrLAP has 128 * been deallocated. We do this to make sure we don't flood IrLAP with 129 * frames, since we are not using the IrTTP flow control mechanism 130 */ 131static void ircomm_lmp_flow_control(struct sk_buff *skb) 132{ 133 struct irda_skb_cb *cb; 134 struct ircomm_cb *self; 135 int line; 136 137 IRDA_ASSERT(skb != NULL, return;); 138 139 cb = (struct irda_skb_cb *) skb->cb; 140 141 line = cb->line; 142 143 self = (struct ircomm_cb *) hashbin_lock_find(ircomm, line, NULL); 144 if (!self) { 145 pr_debug("%s(), didn't find myself\n", __func__); 146 return; 147 } 148 149 IRDA_ASSERT(self != NULL, return;); 150 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;); 151 152 self->pkt_count--; 153 154 if ((self->pkt_count < 2) && (self->flow_status == FLOW_STOP)) { 155 pr_debug("%s(), asking TTY to start again!\n", __func__); 156 self->flow_status = FLOW_START; 157 if (self->notify.flow_indication) 158 self->notify.flow_indication(self->notify.instance, 159 self, FLOW_START); 160 } 161} 162 163/* 164 * Function ircomm_lmp_data_request (self, userdata) 165 * 166 * Send data frame to peer device 167 * 168 */ 169static int ircomm_lmp_data_request(struct ircomm_cb *self, 170 struct sk_buff *skb, 171 int not_used) 172{ 173 struct irda_skb_cb *cb; 174 int ret; 175 176 IRDA_ASSERT(skb != NULL, return -1;); 177 178 cb = (struct irda_skb_cb *) skb->cb; 179 180 cb->line = self->line; 181 182 pr_debug("%s(), sending frame\n", __func__); 183 184 /* Don't forget to refcount it - see ircomm_tty_do_softint() */ 185 skb_get(skb); 186 187 skb_orphan(skb); 188 skb->destructor = ircomm_lmp_flow_control; 189 190 if ((self->pkt_count++ > 7) && (self->flow_status == FLOW_START)) { 191 pr_debug("%s(), asking TTY to slow down!\n", __func__); 192 self->flow_status = FLOW_STOP; 193 if (self->notify.flow_indication) 194 self->notify.flow_indication(self->notify.instance, 195 self, FLOW_STOP); 196 } 197 ret = irlmp_data_request(self->lsap, skb); 198 if (ret) { 199 net_err_ratelimited("%s(), failed\n", __func__); 200 /* irlmp_data_request already free the packet */ 201 } 202 203 return ret; 204} 205 206/* 207 * Function ircomm_lmp_data_indication (instance, sap, skb) 208 * 209 * Incoming data which we must deliver to the state machine, to check 210 * we are still connected. 211 */ 212static int ircomm_lmp_data_indication(void *instance, void *sap, 213 struct sk_buff *skb) 214{ 215 struct ircomm_cb *self = (struct ircomm_cb *) instance; 216 217 IRDA_ASSERT(self != NULL, return -1;); 218 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;); 219 IRDA_ASSERT(skb != NULL, return -1;); 220 221 ircomm_do_event(self, IRCOMM_LMP_DATA_INDICATION, skb, NULL); 222 223 /* Drop reference count - see ircomm_tty_data_indication(). */ 224 dev_kfree_skb(skb); 225 226 return 0; 227} 228 229/* 230 * Function ircomm_lmp_connect_confirm (instance, sap, qos, max_sdu_size, 231 * max_header_size, skb) 232 * 233 * Connection has been confirmed by peer device 234 * 235 */ 236static void ircomm_lmp_connect_confirm(void *instance, void *sap, 237 struct qos_info *qos, 238 __u32 max_seg_size, 239 __u8 max_header_size, 240 struct sk_buff *skb) 241{ 242 struct ircomm_cb *self = (struct ircomm_cb *) instance; 243 struct ircomm_info info; 244 245 IRDA_ASSERT(self != NULL, return;); 246 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;); 247 IRDA_ASSERT(skb != NULL, return;); 248 IRDA_ASSERT(qos != NULL, return;); 249 250 info.max_data_size = max_seg_size; 251 info.max_header_size = max_header_size; 252 info.qos = qos; 253 254 ircomm_do_event(self, IRCOMM_LMP_CONNECT_CONFIRM, skb, &info); 255 256 /* Drop reference count - see ircomm_tty_connect_confirm(). */ 257 dev_kfree_skb(skb); 258} 259 260/* 261 * Function ircomm_lmp_connect_indication (instance, sap, qos, max_sdu_size, 262 * max_header_size, skb) 263 * 264 * Peer device wants to make a connection with us 265 * 266 */ 267static void ircomm_lmp_connect_indication(void *instance, void *sap, 268 struct qos_info *qos, 269 __u32 max_seg_size, 270 __u8 max_header_size, 271 struct sk_buff *skb) 272{ 273 struct ircomm_cb *self = (struct ircomm_cb *)instance; 274 struct ircomm_info info; 275 276 IRDA_ASSERT(self != NULL, return;); 277 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;); 278 IRDA_ASSERT(skb != NULL, return;); 279 IRDA_ASSERT(qos != NULL, return;); 280 281 info.max_data_size = max_seg_size; 282 info.max_header_size = max_header_size; 283 info.qos = qos; 284 285 ircomm_do_event(self, IRCOMM_LMP_CONNECT_INDICATION, skb, &info); 286 287 /* Drop reference count - see ircomm_tty_connect_indication(). */ 288 dev_kfree_skb(skb); 289} 290 291/* 292 * Function ircomm_lmp_disconnect_indication (instance, sap, reason, skb) 293 * 294 * Peer device has closed the connection, or the link went down for some 295 * other reason 296 */ 297static void ircomm_lmp_disconnect_indication(void *instance, void *sap, 298 LM_REASON reason, 299 struct sk_buff *skb) 300{ 301 struct ircomm_cb *self = (struct ircomm_cb *) instance; 302 struct ircomm_info info; 303 304 IRDA_ASSERT(self != NULL, return;); 305 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;); 306 307 info.reason = reason; 308 309 ircomm_do_event(self, IRCOMM_LMP_DISCONNECT_INDICATION, skb, &info); 310 311 /* Drop reference count - see ircomm_tty_disconnect_indication(). */ 312 if(skb) 313 dev_kfree_skb(skb); 314} 315/* 316 * Function ircomm_open_lsap (self) 317 * 318 * Open LSAP. This function will only be used when using "raw" services 319 * 320 */ 321int ircomm_open_lsap(struct ircomm_cb *self) 322{ 323 notify_t notify; 324 325 /* Register callbacks */ 326 irda_notify_init(¬ify); 327 notify.data_indication = ircomm_lmp_data_indication; 328 notify.connect_confirm = ircomm_lmp_connect_confirm; 329 notify.connect_indication = ircomm_lmp_connect_indication; 330 notify.disconnect_indication = ircomm_lmp_disconnect_indication; 331 notify.instance = self; 332 strlcpy(notify.name, "IrCOMM", sizeof(notify.name)); 333 334 self->lsap = irlmp_open_lsap(LSAP_ANY, ¬ify, 0); 335 if (!self->lsap) { 336 pr_debug("%sfailed to allocate tsap\n", __func__); 337 return -1; 338 } 339 self->slsap_sel = self->lsap->slsap_sel; 340 341 /* 342 * Initialize the call-table for issuing commands 343 */ 344 self->issue.data_request = ircomm_lmp_data_request; 345 self->issue.connect_request = ircomm_lmp_connect_request; 346 self->issue.connect_response = ircomm_lmp_connect_response; 347 self->issue.disconnect_request = ircomm_lmp_disconnect_request; 348 349 return 0; 350} 351