Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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/sched.h> |
| 34 | #include <linux/init.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 | */ |
| 51 | static 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", __FUNCTION__ ); |
| 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 | */ |
| 74 | static int ircomm_lmp_connect_response(struct ircomm_cb *self, |
| 75 | struct sk_buff *userdata) |
| 76 | { |
| 77 | struct sk_buff *tx_skb; |
| 78 | int ret; |
| 79 | |
| 80 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| 81 | |
| 82 | /* Any userdata supplied? */ |
| 83 | if (userdata == NULL) { |
Samuel Ortiz | 1b0fee7 | 2006-09-27 20:06:44 -0700 | [diff] [blame^] | 84 | tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | if (!tx_skb) |
| 86 | return -ENOMEM; |
| 87 | |
| 88 | /* Reserve space for MUX and LAP header */ |
| 89 | skb_reserve(tx_skb, LMP_MAX_HEADER); |
| 90 | } else { |
| 91 | /* |
| 92 | * Check that the client has reserved enough space for |
| 93 | * headers |
| 94 | */ |
| 95 | IRDA_ASSERT(skb_headroom(userdata) >= LMP_MAX_HEADER, |
| 96 | return -1;); |
| 97 | |
| 98 | /* Don't forget to refcount it - should be NULL anyway */ |
| 99 | skb_get(userdata); |
| 100 | tx_skb = userdata; |
| 101 | } |
| 102 | |
| 103 | ret = irlmp_connect_response(self->lsap, tx_skb); |
| 104 | |
| 105 | return 0; |
| 106 | } |
| 107 | |
| 108 | static int ircomm_lmp_disconnect_request(struct ircomm_cb *self, |
| 109 | struct sk_buff *userdata, |
| 110 | struct ircomm_info *info) |
| 111 | { |
| 112 | struct sk_buff *tx_skb; |
| 113 | int ret; |
| 114 | |
| 115 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| 116 | |
| 117 | if (!userdata) { |
Samuel Ortiz | 1b0fee7 | 2006-09-27 20:06:44 -0700 | [diff] [blame^] | 118 | tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | if (!tx_skb) |
| 120 | return -ENOMEM; |
| 121 | |
| 122 | /* Reserve space for MUX and LAP header */ |
| 123 | skb_reserve(tx_skb, LMP_MAX_HEADER); |
| 124 | userdata = tx_skb; |
| 125 | } else { |
| 126 | /* Don't forget to refcount it - should be NULL anyway */ |
| 127 | skb_get(userdata); |
| 128 | } |
| 129 | |
| 130 | ret = irlmp_disconnect_request(self->lsap, userdata); |
| 131 | |
| 132 | return ret; |
| 133 | } |
| 134 | |
| 135 | /* |
| 136 | * Function ircomm_lmp_flow_control (skb) |
| 137 | * |
| 138 | * This function is called when a data frame we have sent to IrLAP has |
| 139 | * been deallocated. We do this to make sure we don't flood IrLAP with |
| 140 | * frames, since we are not using the IrTTP flow control mechanism |
| 141 | */ |
| 142 | static void ircomm_lmp_flow_control(struct sk_buff *skb) |
| 143 | { |
| 144 | struct irda_skb_cb *cb; |
| 145 | struct ircomm_cb *self; |
| 146 | int line; |
| 147 | |
| 148 | IRDA_ASSERT(skb != NULL, return;); |
| 149 | |
| 150 | cb = (struct irda_skb_cb *) skb->cb; |
| 151 | |
| 152 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); |
| 153 | |
| 154 | line = cb->line; |
| 155 | |
| 156 | self = (struct ircomm_cb *) hashbin_lock_find(ircomm, line, NULL); |
| 157 | if (!self) { |
| 158 | IRDA_DEBUG(2, "%s(), didn't find myself\n", __FUNCTION__ ); |
| 159 | return; |
| 160 | } |
| 161 | |
| 162 | IRDA_ASSERT(self != NULL, return;); |
| 163 | IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;); |
| 164 | |
| 165 | self->pkt_count--; |
| 166 | |
| 167 | if ((self->pkt_count < 2) && (self->flow_status == FLOW_STOP)) { |
| 168 | IRDA_DEBUG(2, "%s(), asking TTY to start again!\n", __FUNCTION__ ); |
| 169 | self->flow_status = FLOW_START; |
| 170 | if (self->notify.flow_indication) |
| 171 | self->notify.flow_indication(self->notify.instance, |
| 172 | self, FLOW_START); |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | /* |
| 177 | * Function ircomm_lmp_data_request (self, userdata) |
| 178 | * |
| 179 | * Send data frame to peer device |
| 180 | * |
| 181 | */ |
| 182 | static int ircomm_lmp_data_request(struct ircomm_cb *self, |
| 183 | struct sk_buff *skb, |
| 184 | int not_used) |
| 185 | { |
| 186 | struct irda_skb_cb *cb; |
| 187 | int ret; |
| 188 | |
| 189 | IRDA_ASSERT(skb != NULL, return -1;); |
| 190 | |
| 191 | cb = (struct irda_skb_cb *) skb->cb; |
| 192 | |
| 193 | cb->line = self->line; |
| 194 | |
| 195 | IRDA_DEBUG(4, "%s(), sending frame\n", __FUNCTION__ ); |
| 196 | |
| 197 | /* Don't forget to refcount it - see ircomm_tty_do_softint() */ |
| 198 | skb_get(skb); |
| 199 | |
| 200 | skb->destructor = ircomm_lmp_flow_control; |
| 201 | |
| 202 | if ((self->pkt_count++ > 7) && (self->flow_status == FLOW_START)) { |
| 203 | IRDA_DEBUG(2, "%s(), asking TTY to slow down!\n", __FUNCTION__ ); |
| 204 | self->flow_status = FLOW_STOP; |
| 205 | if (self->notify.flow_indication) |
| 206 | self->notify.flow_indication(self->notify.instance, |
| 207 | self, FLOW_STOP); |
| 208 | } |
| 209 | ret = irlmp_data_request(self->lsap, skb); |
| 210 | if (ret) { |
| 211 | IRDA_ERROR("%s(), failed\n", __FUNCTION__); |
| 212 | /* irlmp_data_request already free the packet */ |
| 213 | } |
| 214 | |
| 215 | return ret; |
| 216 | } |
| 217 | |
| 218 | /* |
| 219 | * Function ircomm_lmp_data_indication (instance, sap, skb) |
| 220 | * |
| 221 | * Incoming data which we must deliver to the state machine, to check |
| 222 | * we are still connected. |
| 223 | */ |
| 224 | static int ircomm_lmp_data_indication(void *instance, void *sap, |
| 225 | struct sk_buff *skb) |
| 226 | { |
| 227 | struct ircomm_cb *self = (struct ircomm_cb *) instance; |
| 228 | |
| 229 | IRDA_DEBUG(4, "%s()\n", __FUNCTION__ ); |
| 230 | |
| 231 | IRDA_ASSERT(self != NULL, return -1;); |
| 232 | IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;); |
| 233 | IRDA_ASSERT(skb != NULL, return -1;); |
| 234 | |
| 235 | ircomm_do_event(self, IRCOMM_LMP_DATA_INDICATION, skb, NULL); |
| 236 | |
| 237 | /* Drop reference count - see ircomm_tty_data_indication(). */ |
| 238 | dev_kfree_skb(skb); |
| 239 | |
| 240 | return 0; |
| 241 | } |
| 242 | |
| 243 | /* |
| 244 | * Function ircomm_lmp_connect_confirm (instance, sap, qos, max_sdu_size, |
| 245 | * max_header_size, skb) |
| 246 | * |
| 247 | * Connection has been confirmed by peer device |
| 248 | * |
| 249 | */ |
| 250 | static void ircomm_lmp_connect_confirm(void *instance, void *sap, |
| 251 | struct qos_info *qos, |
| 252 | __u32 max_seg_size, |
| 253 | __u8 max_header_size, |
| 254 | struct sk_buff *skb) |
| 255 | { |
| 256 | struct ircomm_cb *self = (struct ircomm_cb *) instance; |
| 257 | struct ircomm_info info; |
| 258 | |
| 259 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| 260 | |
| 261 | IRDA_ASSERT(self != NULL, return;); |
| 262 | IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;); |
| 263 | IRDA_ASSERT(skb != NULL, return;); |
| 264 | IRDA_ASSERT(qos != NULL, return;); |
| 265 | |
| 266 | info.max_data_size = max_seg_size; |
| 267 | info.max_header_size = max_header_size; |
| 268 | info.qos = qos; |
| 269 | |
| 270 | ircomm_do_event(self, IRCOMM_LMP_CONNECT_CONFIRM, skb, &info); |
| 271 | |
| 272 | /* Drop reference count - see ircomm_tty_connect_confirm(). */ |
| 273 | dev_kfree_skb(skb); |
| 274 | } |
| 275 | |
| 276 | /* |
| 277 | * Function ircomm_lmp_connect_indication (instance, sap, qos, max_sdu_size, |
| 278 | * max_header_size, skb) |
| 279 | * |
| 280 | * Peer device wants to make a connection with us |
| 281 | * |
| 282 | */ |
| 283 | static void ircomm_lmp_connect_indication(void *instance, void *sap, |
| 284 | struct qos_info *qos, |
| 285 | __u32 max_seg_size, |
| 286 | __u8 max_header_size, |
| 287 | struct sk_buff *skb) |
| 288 | { |
| 289 | struct ircomm_cb *self = (struct ircomm_cb *)instance; |
| 290 | struct ircomm_info info; |
| 291 | |
| 292 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| 293 | |
| 294 | IRDA_ASSERT(self != NULL, return;); |
| 295 | IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;); |
| 296 | IRDA_ASSERT(skb != NULL, return;); |
| 297 | IRDA_ASSERT(qos != NULL, return;); |
| 298 | |
| 299 | info.max_data_size = max_seg_size; |
| 300 | info.max_header_size = max_header_size; |
| 301 | info.qos = qos; |
| 302 | |
| 303 | ircomm_do_event(self, IRCOMM_LMP_CONNECT_INDICATION, skb, &info); |
| 304 | |
| 305 | /* Drop reference count - see ircomm_tty_connect_indication(). */ |
| 306 | dev_kfree_skb(skb); |
| 307 | } |
| 308 | |
| 309 | /* |
| 310 | * Function ircomm_lmp_disconnect_indication (instance, sap, reason, skb) |
| 311 | * |
| 312 | * Peer device has closed the connection, or the link went down for some |
| 313 | * other reason |
| 314 | */ |
| 315 | static void ircomm_lmp_disconnect_indication(void *instance, void *sap, |
| 316 | LM_REASON reason, |
| 317 | struct sk_buff *skb) |
| 318 | { |
| 319 | struct ircomm_cb *self = (struct ircomm_cb *) instance; |
| 320 | struct ircomm_info info; |
| 321 | |
| 322 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| 323 | |
| 324 | IRDA_ASSERT(self != NULL, return;); |
| 325 | IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;); |
| 326 | |
| 327 | info.reason = reason; |
| 328 | |
| 329 | ircomm_do_event(self, IRCOMM_LMP_DISCONNECT_INDICATION, skb, &info); |
| 330 | |
| 331 | /* Drop reference count - see ircomm_tty_disconnect_indication(). */ |
| 332 | if(skb) |
| 333 | dev_kfree_skb(skb); |
| 334 | } |
| 335 | /* |
| 336 | * Function ircomm_open_lsap (self) |
| 337 | * |
| 338 | * Open LSAP. This function will only be used when using "raw" services |
| 339 | * |
| 340 | */ |
| 341 | int ircomm_open_lsap(struct ircomm_cb *self) |
| 342 | { |
| 343 | notify_t notify; |
| 344 | |
| 345 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| 346 | |
| 347 | /* Register callbacks */ |
| 348 | irda_notify_init(¬ify); |
| 349 | notify.data_indication = ircomm_lmp_data_indication; |
| 350 | notify.connect_confirm = ircomm_lmp_connect_confirm; |
| 351 | notify.connect_indication = ircomm_lmp_connect_indication; |
| 352 | notify.disconnect_indication = ircomm_lmp_disconnect_indication; |
| 353 | notify.instance = self; |
| 354 | strlcpy(notify.name, "IrCOMM", sizeof(notify.name)); |
| 355 | |
| 356 | self->lsap = irlmp_open_lsap(LSAP_ANY, ¬ify, 0); |
| 357 | if (!self->lsap) { |
| 358 | IRDA_DEBUG(0,"%sfailed to allocate tsap\n", __FUNCTION__ ); |
| 359 | return -1; |
| 360 | } |
| 361 | self->slsap_sel = self->lsap->slsap_sel; |
| 362 | |
| 363 | /* |
| 364 | * Initialize the call-table for issuing commands |
| 365 | */ |
| 366 | self->issue.data_request = ircomm_lmp_data_request; |
| 367 | self->issue.connect_request = ircomm_lmp_connect_request; |
| 368 | self->issue.connect_response = ircomm_lmp_connect_response; |
| 369 | self->issue.disconnect_request = ircomm_lmp_disconnect_request; |
| 370 | |
| 371 | return 0; |
| 372 | } |