| 1 | /********************************************************************* |
| 2 | * |
| 3 | * Filename: ircomm_ttp.c |
| 4 | * Version: 1.0 |
| 5 | * Description: Interface between IrCOMM and IrTTP |
| 6 | * Status: Stable |
| 7 | * Author: Dag Brattli <dagb@cs.uit.no> |
| 8 | * Created at: Sun Jun 6 20:48:27 1999 |
| 9 | * Modified at: Mon Dec 13 11:35:13 1999 |
| 10 | * Modified by: Dag Brattli <dagb@cs.uit.no> |
| 11 | * |
| 12 | * Copyright (c) 1999 Dag Brattli, All Rights Reserved. |
| 13 | * Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com> |
| 14 | * |
| 15 | * This program is free software; you can redistribute it and/or |
| 16 | * modify it under the terms of the GNU General Public License as |
| 17 | * published by the Free Software Foundation; either version 2 of |
| 18 | * the License, or (at your option) any later version. |
| 19 | * |
| 20 | * This program is distributed in the hope that it will be useful, |
| 21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 23 | * GNU General Public License for more details. |
| 24 | * |
| 25 | * You should have received a copy of the GNU General Public License |
| 26 | * along with this program; if not, write to the Free Software |
| 27 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 28 | * MA 02111-1307 USA |
| 29 | * |
| 30 | ********************************************************************/ |
| 31 | |
| 32 | #include <linux/init.h> |
| 33 | |
| 34 | #include <net/irda/irda.h> |
| 35 | #include <net/irda/irlmp.h> |
| 36 | #include <net/irda/iriap.h> |
| 37 | #include <net/irda/irttp.h> |
| 38 | |
| 39 | #include <net/irda/ircomm_event.h> |
| 40 | #include <net/irda/ircomm_ttp.h> |
| 41 | |
| 42 | static int ircomm_ttp_data_indication(void *instance, void *sap, |
| 43 | struct sk_buff *skb); |
| 44 | static void ircomm_ttp_connect_confirm(void *instance, void *sap, |
| 45 | struct qos_info *qos, |
| 46 | __u32 max_sdu_size, |
| 47 | __u8 max_header_size, |
| 48 | struct sk_buff *skb); |
| 49 | static void ircomm_ttp_connect_indication(void *instance, void *sap, |
| 50 | struct qos_info *qos, |
| 51 | __u32 max_sdu_size, |
| 52 | __u8 max_header_size, |
| 53 | struct sk_buff *skb); |
| 54 | static void ircomm_ttp_flow_indication(void *instance, void *sap, |
| 55 | LOCAL_FLOW cmd); |
| 56 | static void ircomm_ttp_disconnect_indication(void *instance, void *sap, |
| 57 | LM_REASON reason, |
| 58 | struct sk_buff *skb); |
| 59 | static int ircomm_ttp_data_request(struct ircomm_cb *self, |
| 60 | struct sk_buff *skb, |
| 61 | int clen); |
| 62 | static int ircomm_ttp_connect_request(struct ircomm_cb *self, |
| 63 | struct sk_buff *userdata, |
| 64 | struct ircomm_info *info); |
| 65 | static int ircomm_ttp_connect_response(struct ircomm_cb *self, |
| 66 | struct sk_buff *userdata); |
| 67 | static int ircomm_ttp_disconnect_request(struct ircomm_cb *self, |
| 68 | struct sk_buff *userdata, |
| 69 | struct ircomm_info *info); |
| 70 | |
| 71 | /* |
| 72 | * Function ircomm_open_tsap (self) |
| 73 | * |
| 74 | * |
| 75 | * |
| 76 | */ |
| 77 | int ircomm_open_tsap(struct ircomm_cb *self) |
| 78 | { |
| 79 | notify_t notify; |
| 80 | |
| 81 | IRDA_DEBUG(4, "%s()\n", __func__ ); |
| 82 | |
| 83 | /* Register callbacks */ |
| 84 | irda_notify_init(¬ify); |
| 85 | notify.data_indication = ircomm_ttp_data_indication; |
| 86 | notify.connect_confirm = ircomm_ttp_connect_confirm; |
| 87 | notify.connect_indication = ircomm_ttp_connect_indication; |
| 88 | notify.flow_indication = ircomm_ttp_flow_indication; |
| 89 | notify.disconnect_indication = ircomm_ttp_disconnect_indication; |
| 90 | notify.instance = self; |
| 91 | strlcpy(notify.name, "IrCOMM", sizeof(notify.name)); |
| 92 | |
| 93 | self->tsap = irttp_open_tsap(LSAP_ANY, DEFAULT_INITIAL_CREDIT, |
| 94 | ¬ify); |
| 95 | if (!self->tsap) { |
| 96 | IRDA_DEBUG(0, "%sfailed to allocate tsap\n", __func__ ); |
| 97 | return -1; |
| 98 | } |
| 99 | self->slsap_sel = self->tsap->stsap_sel; |
| 100 | |
| 101 | /* |
| 102 | * Initialize the call-table for issuing commands |
| 103 | */ |
| 104 | self->issue.data_request = ircomm_ttp_data_request; |
| 105 | self->issue.connect_request = ircomm_ttp_connect_request; |
| 106 | self->issue.connect_response = ircomm_ttp_connect_response; |
| 107 | self->issue.disconnect_request = ircomm_ttp_disconnect_request; |
| 108 | |
| 109 | return 0; |
| 110 | } |
| 111 | |
| 112 | /* |
| 113 | * Function ircomm_ttp_connect_request (self, userdata) |
| 114 | * |
| 115 | * |
| 116 | * |
| 117 | */ |
| 118 | static int ircomm_ttp_connect_request(struct ircomm_cb *self, |
| 119 | struct sk_buff *userdata, |
| 120 | struct ircomm_info *info) |
| 121 | { |
| 122 | int ret = 0; |
| 123 | |
| 124 | IRDA_DEBUG(4, "%s()\n", __func__ ); |
| 125 | |
| 126 | /* Don't forget to refcount it - should be NULL anyway */ |
| 127 | if(userdata) |
| 128 | skb_get(userdata); |
| 129 | |
| 130 | ret = irttp_connect_request(self->tsap, info->dlsap_sel, |
| 131 | info->saddr, info->daddr, NULL, |
| 132 | TTP_SAR_DISABLE, userdata); |
| 133 | |
| 134 | return ret; |
| 135 | } |
| 136 | |
| 137 | /* |
| 138 | * Function ircomm_ttp_connect_response (self, skb) |
| 139 | * |
| 140 | * |
| 141 | * |
| 142 | */ |
| 143 | static int ircomm_ttp_connect_response(struct ircomm_cb *self, |
| 144 | struct sk_buff *userdata) |
| 145 | { |
| 146 | int ret; |
| 147 | |
| 148 | IRDA_DEBUG(4, "%s()\n", __func__ ); |
| 149 | |
| 150 | /* Don't forget to refcount it - should be NULL anyway */ |
| 151 | if(userdata) |
| 152 | skb_get(userdata); |
| 153 | |
| 154 | ret = irttp_connect_response(self->tsap, TTP_SAR_DISABLE, userdata); |
| 155 | |
| 156 | return ret; |
| 157 | } |
| 158 | |
| 159 | /* |
| 160 | * Function ircomm_ttp_data_request (self, userdata) |
| 161 | * |
| 162 | * Send IrCOMM data to IrTTP layer. Currently we do not try to combine |
| 163 | * control data with pure data, so they will be sent as separate frames. |
| 164 | * Should not be a big problem though, since control frames are rare. But |
| 165 | * some of them are sent after connection establishment, so this can |
| 166 | * increase the latency a bit. |
| 167 | */ |
| 168 | static int ircomm_ttp_data_request(struct ircomm_cb *self, |
| 169 | struct sk_buff *skb, |
| 170 | int clen) |
| 171 | { |
| 172 | int ret; |
| 173 | |
| 174 | IRDA_ASSERT(skb != NULL, return -1;); |
| 175 | |
| 176 | IRDA_DEBUG(2, "%s(), clen=%d\n", __func__ , clen); |
| 177 | |
| 178 | /* |
| 179 | * Insert clen field, currently we either send data only, or control |
| 180 | * only frames, to make things easier and avoid queueing |
| 181 | */ |
| 182 | IRDA_ASSERT(skb_headroom(skb) >= IRCOMM_HEADER_SIZE, return -1;); |
| 183 | |
| 184 | /* Don't forget to refcount it - see ircomm_tty_do_softint() */ |
| 185 | skb_get(skb); |
| 186 | |
| 187 | skb_push(skb, IRCOMM_HEADER_SIZE); |
| 188 | |
| 189 | skb->data[0] = clen; |
| 190 | |
| 191 | ret = irttp_data_request(self->tsap, skb); |
| 192 | if (ret) { |
| 193 | IRDA_ERROR("%s(), failed\n", __func__); |
| 194 | /* irttp_data_request already free the packet */ |
| 195 | } |
| 196 | |
| 197 | return ret; |
| 198 | } |
| 199 | |
| 200 | /* |
| 201 | * Function ircomm_ttp_data_indication (instance, sap, skb) |
| 202 | * |
| 203 | * Incoming data |
| 204 | * |
| 205 | */ |
| 206 | static int ircomm_ttp_data_indication(void *instance, void *sap, |
| 207 | struct sk_buff *skb) |
| 208 | { |
| 209 | struct ircomm_cb *self = (struct ircomm_cb *) instance; |
| 210 | |
| 211 | IRDA_DEBUG(4, "%s()\n", __func__ ); |
| 212 | |
| 213 | IRDA_ASSERT(self != NULL, return -1;); |
| 214 | IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;); |
| 215 | IRDA_ASSERT(skb != NULL, return -1;); |
| 216 | |
| 217 | ircomm_do_event(self, IRCOMM_TTP_DATA_INDICATION, skb, NULL); |
| 218 | |
| 219 | /* Drop reference count - see ircomm_tty_data_indication(). */ |
| 220 | dev_kfree_skb(skb); |
| 221 | |
| 222 | return 0; |
| 223 | } |
| 224 | |
| 225 | static void ircomm_ttp_connect_confirm(void *instance, void *sap, |
| 226 | struct qos_info *qos, |
| 227 | __u32 max_sdu_size, |
| 228 | __u8 max_header_size, |
| 229 | struct sk_buff *skb) |
| 230 | { |
| 231 | struct ircomm_cb *self = (struct ircomm_cb *) instance; |
| 232 | struct ircomm_info info; |
| 233 | |
| 234 | IRDA_DEBUG(4, "%s()\n", __func__ ); |
| 235 | |
| 236 | IRDA_ASSERT(self != NULL, return;); |
| 237 | IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;); |
| 238 | IRDA_ASSERT(skb != NULL, return;); |
| 239 | IRDA_ASSERT(qos != NULL, goto out;); |
| 240 | |
| 241 | if (max_sdu_size != TTP_SAR_DISABLE) { |
| 242 | IRDA_ERROR("%s(), SAR not allowed for IrCOMM!\n", |
| 243 | __func__); |
| 244 | goto out; |
| 245 | } |
| 246 | |
| 247 | info.max_data_size = irttp_get_max_seg_size(self->tsap) |
| 248 | - IRCOMM_HEADER_SIZE; |
| 249 | info.max_header_size = max_header_size + IRCOMM_HEADER_SIZE; |
| 250 | info.qos = qos; |
| 251 | |
| 252 | ircomm_do_event(self, IRCOMM_TTP_CONNECT_CONFIRM, skb, &info); |
| 253 | |
| 254 | out: |
| 255 | /* Drop reference count - see ircomm_tty_connect_confirm(). */ |
| 256 | dev_kfree_skb(skb); |
| 257 | } |
| 258 | |
| 259 | /* |
| 260 | * Function ircomm_ttp_connect_indication (instance, sap, qos, max_sdu_size, |
| 261 | * max_header_size, skb) |
| 262 | * |
| 263 | * |
| 264 | * |
| 265 | */ |
| 266 | static void ircomm_ttp_connect_indication(void *instance, void *sap, |
| 267 | struct qos_info *qos, |
| 268 | __u32 max_sdu_size, |
| 269 | __u8 max_header_size, |
| 270 | struct sk_buff *skb) |
| 271 | { |
| 272 | struct ircomm_cb *self = (struct ircomm_cb *)instance; |
| 273 | struct ircomm_info info; |
| 274 | |
| 275 | IRDA_DEBUG(4, "%s()\n", __func__ ); |
| 276 | |
| 277 | IRDA_ASSERT(self != NULL, return;); |
| 278 | IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;); |
| 279 | IRDA_ASSERT(skb != NULL, return;); |
| 280 | IRDA_ASSERT(qos != NULL, goto out;); |
| 281 | |
| 282 | if (max_sdu_size != TTP_SAR_DISABLE) { |
| 283 | IRDA_ERROR("%s(), SAR not allowed for IrCOMM!\n", |
| 284 | __func__); |
| 285 | goto out; |
| 286 | } |
| 287 | |
| 288 | info.max_data_size = irttp_get_max_seg_size(self->tsap) |
| 289 | - IRCOMM_HEADER_SIZE; |
| 290 | info.max_header_size = max_header_size + IRCOMM_HEADER_SIZE; |
| 291 | info.qos = qos; |
| 292 | |
| 293 | ircomm_do_event(self, IRCOMM_TTP_CONNECT_INDICATION, skb, &info); |
| 294 | |
| 295 | out: |
| 296 | /* Drop reference count - see ircomm_tty_connect_indication(). */ |
| 297 | dev_kfree_skb(skb); |
| 298 | } |
| 299 | |
| 300 | /* |
| 301 | * Function ircomm_ttp_disconnect_request (self, userdata, info) |
| 302 | * |
| 303 | * |
| 304 | * |
| 305 | */ |
| 306 | static int ircomm_ttp_disconnect_request(struct ircomm_cb *self, |
| 307 | struct sk_buff *userdata, |
| 308 | struct ircomm_info *info) |
| 309 | { |
| 310 | int ret; |
| 311 | |
| 312 | /* Don't forget to refcount it - should be NULL anyway */ |
| 313 | if(userdata) |
| 314 | skb_get(userdata); |
| 315 | |
| 316 | ret = irttp_disconnect_request(self->tsap, userdata, P_NORMAL); |
| 317 | |
| 318 | return ret; |
| 319 | } |
| 320 | |
| 321 | /* |
| 322 | * Function ircomm_ttp_disconnect_indication (instance, sap, reason, skb) |
| 323 | * |
| 324 | * |
| 325 | * |
| 326 | */ |
| 327 | static void ircomm_ttp_disconnect_indication(void *instance, void *sap, |
| 328 | LM_REASON reason, |
| 329 | struct sk_buff *skb) |
| 330 | { |
| 331 | struct ircomm_cb *self = (struct ircomm_cb *) instance; |
| 332 | struct ircomm_info info; |
| 333 | |
| 334 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
| 335 | |
| 336 | IRDA_ASSERT(self != NULL, return;); |
| 337 | IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;); |
| 338 | |
| 339 | info.reason = reason; |
| 340 | |
| 341 | ircomm_do_event(self, IRCOMM_TTP_DISCONNECT_INDICATION, skb, &info); |
| 342 | |
| 343 | /* Drop reference count - see ircomm_tty_disconnect_indication(). */ |
| 344 | if(skb) |
| 345 | dev_kfree_skb(skb); |
| 346 | } |
| 347 | |
| 348 | /* |
| 349 | * Function ircomm_ttp_flow_indication (instance, sap, cmd) |
| 350 | * |
| 351 | * Layer below is telling us to start or stop the flow of data |
| 352 | * |
| 353 | */ |
| 354 | static void ircomm_ttp_flow_indication(void *instance, void *sap, |
| 355 | LOCAL_FLOW cmd) |
| 356 | { |
| 357 | struct ircomm_cb *self = (struct ircomm_cb *) instance; |
| 358 | |
| 359 | IRDA_DEBUG(4, "%s()\n", __func__ ); |
| 360 | |
| 361 | IRDA_ASSERT(self != NULL, return;); |
| 362 | IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;); |
| 363 | |
| 364 | if (self->notify.flow_indication) |
| 365 | self->notify.flow_indication(self->notify.instance, self, cmd); |
| 366 | } |
| 367 | |
| 368 | |