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1da177e4 LT |
1 | /********************************************************************* |
2 | * | |
3 | * Filename: irlap_frame.c | |
4 | * Version: 1.0 | |
5 | * Description: Build and transmit IrLAP frames | |
6 | * Status: Stable | |
7 | * Author: Dag Brattli <dagb@cs.uit.no> | |
8 | * Created at: Tue Aug 19 10:27:26 1997 | |
9 | * Modified at: Wed Jan 5 08:59:04 2000 | |
10 | * Modified by: Dag Brattli <dagb@cs.uit.no> | |
11 | * | |
12 | * Copyright (c) 1998-2000 Dag Brattli <dagb@cs.uit.no>, | |
13 | * 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 | * | |
96de0e25 | 21 | * Neither Dag Brattli nor University of Tromsø admit liability nor |
1da177e4 LT |
22 | * provide warranty for any of this software. This material is |
23 | * provided "AS-IS" and at no charge. | |
24 | * | |
25 | ********************************************************************/ | |
26 | ||
27 | #include <linux/skbuff.h> | |
28 | #include <linux/if.h> | |
29 | #include <linux/if_ether.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/irda.h> | |
5a0e3ad6 | 32 | #include <linux/slab.h> |
1da177e4 LT |
33 | |
34 | #include <net/pkt_sched.h> | |
35 | #include <net/sock.h> | |
36 | ||
37 | #include <asm/byteorder.h> | |
38 | ||
39 | #include <net/irda/irda.h> | |
40 | #include <net/irda/irda_device.h> | |
41 | #include <net/irda/irlap.h> | |
42 | #include <net/irda/wrapper.h> | |
43 | #include <net/irda/timer.h> | |
44 | #include <net/irda/irlap_frame.h> | |
45 | #include <net/irda/qos.h> | |
46 | ||
47 | static void irlap_send_i_frame(struct irlap_cb *self, struct sk_buff *skb, | |
48 | int command); | |
49 | ||
50 | /* | |
51 | * Function irlap_insert_info (self, skb) | |
52 | * | |
53 | * Insert minimum turnaround time and speed information into the skb. We | |
54 | * need to do this since it's per packet relevant information. Safe to | |
55 | * have this function inlined since it's only called from one place | |
56 | */ | |
57 | static inline void irlap_insert_info(struct irlap_cb *self, | |
58 | struct sk_buff *skb) | |
59 | { | |
60 | struct irda_skb_cb *cb = (struct irda_skb_cb *) skb->cb; | |
61 | ||
62 | /* | |
63 | * Insert MTT (min. turn time) and speed into skb, so that the | |
64 | * device driver knows which settings to use | |
65 | */ | |
66 | cb->magic = LAP_MAGIC; | |
67 | cb->mtt = self->mtt_required; | |
68 | cb->next_speed = self->speed; | |
69 | ||
70 | /* Reset */ | |
71 | self->mtt_required = 0; | |
72 | ||
73 | /* | |
74 | * Delay equals negotiated BOFs count, plus the number of BOFs to | |
75 | * force the negotiated minimum turnaround time | |
76 | */ | |
77 | cb->xbofs = self->bofs_count; | |
78 | cb->next_xbofs = self->next_bofs; | |
79 | cb->xbofs_delay = self->xbofs_delay; | |
80 | ||
81 | /* Reset XBOF's delay (used only for getting min turn time) */ | |
82 | self->xbofs_delay = 0; | |
83 | /* Put the correct xbofs value for the next packet */ | |
84 | self->bofs_count = self->next_bofs; | |
85 | } | |
86 | ||
87 | /* | |
88 | * Function irlap_queue_xmit (self, skb) | |
89 | * | |
90 | * A little wrapper for dev_queue_xmit, so we can insert some common | |
91 | * code into it. | |
92 | */ | |
93 | void irlap_queue_xmit(struct irlap_cb *self, struct sk_buff *skb) | |
94 | { | |
95 | /* Some common init stuff */ | |
96 | skb->dev = self->netdev; | |
459a98ed | 97 | skb_reset_mac_header(skb); |
c1d2bbe1 | 98 | skb_reset_network_header(skb); |
badff6d0 | 99 | skb_reset_transport_header(skb); |
1da177e4 LT |
100 | skb->protocol = htons(ETH_P_IRDA); |
101 | skb->priority = TC_PRIO_BESTEFFORT; | |
102 | ||
103 | irlap_insert_info(self, skb); | |
104 | ||
41172528 | 105 | if (unlikely(self->mode & IRDA_MODE_MONITOR)) { |
955a9d20 JP |
106 | pr_debug("%s(): %s is in monitor mode\n", __func__, |
107 | self->netdev->name); | |
41172528 SO |
108 | dev_kfree_skb(skb); |
109 | return; | |
110 | } | |
111 | ||
1da177e4 LT |
112 | dev_queue_xmit(skb); |
113 | } | |
114 | ||
115 | /* | |
116 | * Function irlap_send_snrm_cmd (void) | |
117 | * | |
118 | * Transmits a connect SNRM command frame | |
119 | */ | |
120 | void irlap_send_snrm_frame(struct irlap_cb *self, struct qos_info *qos) | |
121 | { | |
122 | struct sk_buff *tx_skb; | |
123 | struct snrm_frame *frame; | |
124 | int ret; | |
125 | ||
126 | IRDA_ASSERT(self != NULL, return;); | |
127 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
128 | ||
129 | /* Allocate frame */ | |
1b0fee7d SO |
130 | tx_skb = alloc_skb(sizeof(struct snrm_frame) + |
131 | IRLAP_NEGOCIATION_PARAMS_LEN, | |
132 | GFP_ATOMIC); | |
1da177e4 LT |
133 | if (!tx_skb) |
134 | return; | |
135 | ||
136 | frame = (struct snrm_frame *) skb_put(tx_skb, 2); | |
137 | ||
138 | /* Insert connection address field */ | |
139 | if (qos) | |
140 | frame->caddr = CMD_FRAME | CBROADCAST; | |
141 | else | |
142 | frame->caddr = CMD_FRAME | self->caddr; | |
143 | ||
144 | /* Insert control field */ | |
145 | frame->control = SNRM_CMD | PF_BIT; | |
146 | ||
147 | /* | |
cc53ded2 | 148 | * If we are establishing a connection then insert QoS parameters |
1da177e4 LT |
149 | */ |
150 | if (qos) { | |
1b0fee7d | 151 | skb_put(tx_skb, 9); /* 25 left */ |
1da177e4 LT |
152 | frame->saddr = cpu_to_le32(self->saddr); |
153 | frame->daddr = cpu_to_le32(self->daddr); | |
154 | ||
155 | frame->ncaddr = self->caddr; | |
156 | ||
157 | ret = irlap_insert_qos_negotiation_params(self, tx_skb); | |
158 | if (ret < 0) { | |
159 | dev_kfree_skb(tx_skb); | |
160 | return; | |
161 | } | |
162 | } | |
163 | irlap_queue_xmit(self, tx_skb); | |
164 | } | |
165 | ||
166 | /* | |
167 | * Function irlap_recv_snrm_cmd (skb, info) | |
168 | * | |
169 | * Received SNRM (Set Normal Response Mode) command frame | |
170 | * | |
171 | */ | |
172 | static void irlap_recv_snrm_cmd(struct irlap_cb *self, struct sk_buff *skb, | |
173 | struct irlap_info *info) | |
174 | { | |
175 | struct snrm_frame *frame; | |
176 | ||
177 | if (pskb_may_pull(skb,sizeof(struct snrm_frame))) { | |
178 | frame = (struct snrm_frame *) skb->data; | |
179 | ||
180 | /* Copy the new connection address ignoring the C/R bit */ | |
181 | info->caddr = frame->ncaddr & 0xFE; | |
182 | ||
183 | /* Check if the new connection address is valid */ | |
184 | if ((info->caddr == 0x00) || (info->caddr == 0xfe)) { | |
955a9d20 JP |
185 | pr_debug("%s(), invalid connection address!\n", |
186 | __func__); | |
1da177e4 LT |
187 | return; |
188 | } | |
189 | ||
190 | /* Copy peer device address */ | |
191 | info->daddr = le32_to_cpu(frame->saddr); | |
192 | info->saddr = le32_to_cpu(frame->daddr); | |
193 | ||
194 | /* Only accept if addressed directly to us */ | |
195 | if (info->saddr != self->saddr) { | |
955a9d20 JP |
196 | pr_debug("%s(), not addressed to us!\n", |
197 | __func__); | |
1da177e4 LT |
198 | return; |
199 | } | |
200 | irlap_do_event(self, RECV_SNRM_CMD, skb, info); | |
201 | } else { | |
202 | /* Signal that this SNRM frame does not contain and I-field */ | |
203 | irlap_do_event(self, RECV_SNRM_CMD, skb, NULL); | |
204 | } | |
205 | } | |
206 | ||
207 | /* | |
208 | * Function irlap_send_ua_response_frame (qos) | |
209 | * | |
210 | * Send UA (Unnumbered Acknowledgement) frame | |
211 | * | |
212 | */ | |
213 | void irlap_send_ua_response_frame(struct irlap_cb *self, struct qos_info *qos) | |
214 | { | |
215 | struct sk_buff *tx_skb; | |
216 | struct ua_frame *frame; | |
217 | int ret; | |
218 | ||
955a9d20 | 219 | pr_debug("%s() <%ld>\n", __func__, jiffies); |
1da177e4 LT |
220 | |
221 | IRDA_ASSERT(self != NULL, return;); | |
222 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
223 | ||
224 | /* Allocate frame */ | |
1b0fee7d SO |
225 | tx_skb = alloc_skb(sizeof(struct ua_frame) + |
226 | IRLAP_NEGOCIATION_PARAMS_LEN, | |
227 | GFP_ATOMIC); | |
1da177e4 LT |
228 | if (!tx_skb) |
229 | return; | |
230 | ||
231 | frame = (struct ua_frame *) skb_put(tx_skb, 10); | |
232 | ||
233 | /* Build UA response */ | |
234 | frame->caddr = self->caddr; | |
235 | frame->control = UA_RSP | PF_BIT; | |
236 | ||
237 | frame->saddr = cpu_to_le32(self->saddr); | |
238 | frame->daddr = cpu_to_le32(self->daddr); | |
239 | ||
240 | /* Should we send QoS negotiation parameters? */ | |
241 | if (qos) { | |
242 | ret = irlap_insert_qos_negotiation_params(self, tx_skb); | |
243 | if (ret < 0) { | |
244 | dev_kfree_skb(tx_skb); | |
245 | return; | |
246 | } | |
247 | } | |
248 | ||
249 | irlap_queue_xmit(self, tx_skb); | |
250 | } | |
251 | ||
252 | ||
253 | /* | |
254 | * Function irlap_send_dm_frame (void) | |
255 | * | |
256 | * Send disconnected mode (DM) frame | |
257 | * | |
258 | */ | |
259 | void irlap_send_dm_frame( struct irlap_cb *self) | |
260 | { | |
261 | struct sk_buff *tx_skb = NULL; | |
1b0fee7d | 262 | struct dm_frame *frame; |
1da177e4 LT |
263 | |
264 | IRDA_ASSERT(self != NULL, return;); | |
265 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
266 | ||
1b0fee7d | 267 | tx_skb = alloc_skb(sizeof(struct dm_frame), GFP_ATOMIC); |
1da177e4 LT |
268 | if (!tx_skb) |
269 | return; | |
270 | ||
1b0fee7d | 271 | frame = (struct dm_frame *)skb_put(tx_skb, 2); |
1da177e4 LT |
272 | |
273 | if (self->state == LAP_NDM) | |
1b0fee7d | 274 | frame->caddr = CBROADCAST; |
1da177e4 | 275 | else |
1b0fee7d | 276 | frame->caddr = self->caddr; |
1da177e4 | 277 | |
1b0fee7d | 278 | frame->control = DM_RSP | PF_BIT; |
1da177e4 LT |
279 | |
280 | irlap_queue_xmit(self, tx_skb); | |
281 | } | |
282 | ||
283 | /* | |
284 | * Function irlap_send_disc_frame (void) | |
285 | * | |
286 | * Send disconnect (DISC) frame | |
287 | * | |
288 | */ | |
289 | void irlap_send_disc_frame(struct irlap_cb *self) | |
290 | { | |
291 | struct sk_buff *tx_skb = NULL; | |
1b0fee7d | 292 | struct disc_frame *frame; |
1da177e4 | 293 | |
1da177e4 LT |
294 | IRDA_ASSERT(self != NULL, return;); |
295 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
296 | ||
1b0fee7d | 297 | tx_skb = alloc_skb(sizeof(struct disc_frame), GFP_ATOMIC); |
1da177e4 LT |
298 | if (!tx_skb) |
299 | return; | |
300 | ||
1b0fee7d | 301 | frame = (struct disc_frame *)skb_put(tx_skb, 2); |
1da177e4 | 302 | |
1b0fee7d SO |
303 | frame->caddr = self->caddr | CMD_FRAME; |
304 | frame->control = DISC_CMD | PF_BIT; | |
1da177e4 LT |
305 | |
306 | irlap_queue_xmit(self, tx_skb); | |
307 | } | |
308 | ||
309 | /* | |
310 | * Function irlap_send_discovery_xid_frame (S, s, command) | |
311 | * | |
312 | * Build and transmit a XID (eXchange station IDentifier) discovery | |
313 | * frame. | |
314 | */ | |
315 | void irlap_send_discovery_xid_frame(struct irlap_cb *self, int S, __u8 s, | |
316 | __u8 command, discovery_t *discovery) | |
317 | { | |
318 | struct sk_buff *tx_skb = NULL; | |
319 | struct xid_frame *frame; | |
320 | __u32 bcast = BROADCAST; | |
321 | __u8 *info; | |
322 | ||
955a9d20 JP |
323 | pr_debug("%s(), s=%d, S=%d, command=%d\n", __func__, |
324 | s, S, command); | |
1da177e4 LT |
325 | |
326 | IRDA_ASSERT(self != NULL, return;); | |
327 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
328 | IRDA_ASSERT(discovery != NULL, return;); | |
329 | ||
1b0fee7d SO |
330 | tx_skb = alloc_skb(sizeof(struct xid_frame) + IRLAP_DISCOVERY_INFO_LEN, |
331 | GFP_ATOMIC); | |
1da177e4 LT |
332 | if (!tx_skb) |
333 | return; | |
334 | ||
335 | skb_put(tx_skb, 14); | |
336 | frame = (struct xid_frame *) tx_skb->data; | |
337 | ||
338 | if (command) { | |
339 | frame->caddr = CBROADCAST | CMD_FRAME; | |
340 | frame->control = XID_CMD | PF_BIT; | |
341 | } else { | |
342 | frame->caddr = CBROADCAST; | |
343 | frame->control = XID_RSP | PF_BIT; | |
344 | } | |
345 | frame->ident = XID_FORMAT; | |
346 | ||
347 | frame->saddr = cpu_to_le32(self->saddr); | |
348 | ||
349 | if (command) | |
350 | frame->daddr = cpu_to_le32(bcast); | |
351 | else | |
352 | frame->daddr = cpu_to_le32(discovery->data.daddr); | |
353 | ||
354 | switch (S) { | |
355 | case 1: | |
356 | frame->flags = 0x00; | |
357 | break; | |
358 | case 6: | |
359 | frame->flags = 0x01; | |
360 | break; | |
361 | case 8: | |
362 | frame->flags = 0x02; | |
363 | break; | |
364 | case 16: | |
365 | frame->flags = 0x03; | |
366 | break; | |
367 | default: | |
368 | frame->flags = 0x02; | |
369 | break; | |
370 | } | |
371 | ||
372 | frame->slotnr = s; | |
373 | frame->version = 0x00; | |
374 | ||
375 | /* | |
376 | * Provide info for final slot only in commands, and for all | |
377 | * responses. Send the second byte of the hint only if the | |
378 | * EXTENSION bit is set in the first byte. | |
379 | */ | |
380 | if (!command || (frame->slotnr == 0xff)) { | |
381 | int len; | |
382 | ||
383 | if (discovery->data.hints[0] & HINT_EXTENSION) { | |
384 | info = skb_put(tx_skb, 2); | |
385 | info[0] = discovery->data.hints[0]; | |
386 | info[1] = discovery->data.hints[1]; | |
387 | } else { | |
388 | info = skb_put(tx_skb, 1); | |
389 | info[0] = discovery->data.hints[0]; | |
390 | } | |
391 | info = skb_put(tx_skb, 1); | |
392 | info[0] = discovery->data.charset; | |
393 | ||
394 | len = IRDA_MIN(discovery->name_len, skb_tailroom(tx_skb)); | |
395 | info = skb_put(tx_skb, len); | |
396 | memcpy(info, discovery->data.info, len); | |
397 | } | |
398 | irlap_queue_xmit(self, tx_skb); | |
399 | } | |
400 | ||
401 | /* | |
402 | * Function irlap_recv_discovery_xid_rsp (skb, info) | |
403 | * | |
404 | * Received a XID discovery response | |
405 | * | |
406 | */ | |
407 | static void irlap_recv_discovery_xid_rsp(struct irlap_cb *self, | |
408 | struct sk_buff *skb, | |
409 | struct irlap_info *info) | |
410 | { | |
411 | struct xid_frame *xid; | |
412 | discovery_t *discovery = NULL; | |
413 | __u8 *discovery_info; | |
414 | char *text; | |
415 | ||
1da177e4 LT |
416 | IRDA_ASSERT(self != NULL, return;); |
417 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
418 | ||
419 | if (!pskb_may_pull(skb, sizeof(struct xid_frame))) { | |
6c91023d | 420 | net_err_ratelimited("%s: frame too short!\n", __func__); |
1da177e4 LT |
421 | return; |
422 | } | |
6819bc2e | 423 | |
1da177e4 LT |
424 | xid = (struct xid_frame *) skb->data; |
425 | ||
426 | info->daddr = le32_to_cpu(xid->saddr); | |
427 | info->saddr = le32_to_cpu(xid->daddr); | |
428 | ||
429 | /* Make sure frame is addressed to us */ | |
430 | if ((info->saddr != self->saddr) && (info->saddr != BROADCAST)) { | |
955a9d20 JP |
431 | pr_debug("%s(), frame is not addressed to us!\n", |
432 | __func__); | |
1da177e4 LT |
433 | return; |
434 | } | |
435 | ||
0da974f4 | 436 | if ((discovery = kzalloc(sizeof(discovery_t), GFP_ATOMIC)) == NULL) { |
6c91023d | 437 | net_warn_ratelimited("%s: kmalloc failed!\n", __func__); |
1da177e4 LT |
438 | return; |
439 | } | |
1da177e4 LT |
440 | |
441 | discovery->data.daddr = info->daddr; | |
442 | discovery->data.saddr = self->saddr; | |
443 | discovery->timestamp = jiffies; | |
444 | ||
955a9d20 JP |
445 | pr_debug("%s(), daddr=%08x\n", __func__, |
446 | discovery->data.daddr); | |
1da177e4 LT |
447 | |
448 | discovery_info = skb_pull(skb, sizeof(struct xid_frame)); | |
449 | ||
450 | /* Get info returned from peer */ | |
451 | discovery->data.hints[0] = discovery_info[0]; | |
452 | if (discovery_info[0] & HINT_EXTENSION) { | |
955a9d20 | 453 | pr_debug("EXTENSION\n"); |
1da177e4 LT |
454 | discovery->data.hints[1] = discovery_info[1]; |
455 | discovery->data.charset = discovery_info[2]; | |
456 | text = (char *) &discovery_info[3]; | |
457 | } else { | |
458 | discovery->data.hints[1] = 0; | |
459 | discovery->data.charset = discovery_info[1]; | |
460 | text = (char *) &discovery_info[2]; | |
461 | } | |
462 | /* | |
463 | * Terminate info string, should be safe since this is where the | |
464 | * FCS bytes resides. | |
465 | */ | |
466 | skb->data[skb->len] = '\0'; | |
467 | strncpy(discovery->data.info, text, NICKNAME_MAX_LEN); | |
468 | discovery->name_len = strlen(discovery->data.info); | |
469 | ||
470 | info->discovery = discovery; | |
471 | ||
472 | irlap_do_event(self, RECV_DISCOVERY_XID_RSP, skb, info); | |
473 | } | |
474 | ||
475 | /* | |
476 | * Function irlap_recv_discovery_xid_cmd (skb, info) | |
477 | * | |
478 | * Received a XID discovery command | |
479 | * | |
480 | */ | |
481 | static void irlap_recv_discovery_xid_cmd(struct irlap_cb *self, | |
482 | struct sk_buff *skb, | |
483 | struct irlap_info *info) | |
484 | { | |
485 | struct xid_frame *xid; | |
486 | discovery_t *discovery = NULL; | |
487 | __u8 *discovery_info; | |
488 | char *text; | |
489 | ||
490 | if (!pskb_may_pull(skb, sizeof(struct xid_frame))) { | |
6c91023d | 491 | net_err_ratelimited("%s: frame too short!\n", __func__); |
1da177e4 LT |
492 | return; |
493 | } | |
6819bc2e | 494 | |
1da177e4 LT |
495 | xid = (struct xid_frame *) skb->data; |
496 | ||
497 | info->daddr = le32_to_cpu(xid->saddr); | |
498 | info->saddr = le32_to_cpu(xid->daddr); | |
499 | ||
500 | /* Make sure frame is addressed to us */ | |
501 | if ((info->saddr != self->saddr) && (info->saddr != BROADCAST)) { | |
955a9d20 JP |
502 | pr_debug("%s(), frame is not addressed to us!\n", |
503 | __func__); | |
1da177e4 LT |
504 | return; |
505 | } | |
506 | ||
507 | switch (xid->flags & 0x03) { | |
508 | case 0x00: | |
509 | info->S = 1; | |
510 | break; | |
511 | case 0x01: | |
512 | info->S = 6; | |
513 | break; | |
514 | case 0x02: | |
515 | info->S = 8; | |
516 | break; | |
517 | case 0x03: | |
518 | info->S = 16; | |
519 | break; | |
520 | default: | |
521 | /* Error!! */ | |
522 | return; | |
523 | } | |
524 | info->s = xid->slotnr; | |
525 | ||
526 | discovery_info = skb_pull(skb, sizeof(struct xid_frame)); | |
527 | ||
528 | /* | |
529 | * Check if last frame | |
530 | */ | |
531 | if (info->s == 0xff) { | |
532 | /* Check if things are sane at this point... */ | |
6819bc2e | 533 | if((discovery_info == NULL) || |
1da177e4 | 534 | !pskb_may_pull(skb, 3)) { |
6c91023d JP |
535 | net_err_ratelimited("%s: discovery frame too short!\n", |
536 | __func__); | |
1da177e4 LT |
537 | return; |
538 | } | |
539 | ||
540 | /* | |
541 | * We now have some discovery info to deliver! | |
542 | */ | |
ff0102ee | 543 | discovery = kzalloc(sizeof(discovery_t), GFP_ATOMIC); |
6c91023d | 544 | if (!discovery) |
1da177e4 | 545 | return; |
1da177e4 LT |
546 | |
547 | discovery->data.daddr = info->daddr; | |
548 | discovery->data.saddr = self->saddr; | |
549 | discovery->timestamp = jiffies; | |
550 | ||
551 | discovery->data.hints[0] = discovery_info[0]; | |
552 | if (discovery_info[0] & HINT_EXTENSION) { | |
553 | discovery->data.hints[1] = discovery_info[1]; | |
554 | discovery->data.charset = discovery_info[2]; | |
555 | text = (char *) &discovery_info[3]; | |
556 | } else { | |
557 | discovery->data.hints[1] = 0; | |
558 | discovery->data.charset = discovery_info[1]; | |
559 | text = (char *) &discovery_info[2]; | |
560 | } | |
561 | /* | |
562 | * Terminate string, should be safe since this is where the | |
563 | * FCS bytes resides. | |
564 | */ | |
565 | skb->data[skb->len] = '\0'; | |
566 | strncpy(discovery->data.info, text, NICKNAME_MAX_LEN); | |
567 | discovery->name_len = strlen(discovery->data.info); | |
568 | ||
569 | info->discovery = discovery; | |
570 | } else | |
571 | info->discovery = NULL; | |
572 | ||
573 | irlap_do_event(self, RECV_DISCOVERY_XID_CMD, skb, info); | |
574 | } | |
575 | ||
576 | /* | |
577 | * Function irlap_send_rr_frame (self, command) | |
578 | * | |
579 | * Build and transmit RR (Receive Ready) frame. Notice that it is currently | |
580 | * only possible to send RR frames with the poll bit set. | |
581 | */ | |
582 | void irlap_send_rr_frame(struct irlap_cb *self, int command) | |
583 | { | |
584 | struct sk_buff *tx_skb; | |
1b0fee7d | 585 | struct rr_frame *frame; |
1da177e4 | 586 | |
1b0fee7d | 587 | tx_skb = alloc_skb(sizeof(struct rr_frame), GFP_ATOMIC); |
1da177e4 LT |
588 | if (!tx_skb) |
589 | return; | |
590 | ||
1b0fee7d | 591 | frame = (struct rr_frame *)skb_put(tx_skb, 2); |
1da177e4 | 592 | |
1b0fee7d SO |
593 | frame->caddr = self->caddr; |
594 | frame->caddr |= (command) ? CMD_FRAME : 0; | |
1da177e4 | 595 | |
1b0fee7d | 596 | frame->control = RR | PF_BIT | (self->vr << 5); |
1da177e4 LT |
597 | |
598 | irlap_queue_xmit(self, tx_skb); | |
599 | } | |
600 | ||
601 | /* | |
602 | * Function irlap_send_rd_frame (self) | |
603 | * | |
604 | * Request disconnect. Used by a secondary station to request the | |
605 | * disconnection of the link. | |
606 | */ | |
607 | void irlap_send_rd_frame(struct irlap_cb *self) | |
608 | { | |
609 | struct sk_buff *tx_skb; | |
1b0fee7d | 610 | struct rd_frame *frame; |
1da177e4 | 611 | |
1b0fee7d | 612 | tx_skb = alloc_skb(sizeof(struct rd_frame), GFP_ATOMIC); |
1da177e4 LT |
613 | if (!tx_skb) |
614 | return; | |
615 | ||
1b0fee7d | 616 | frame = (struct rd_frame *)skb_put(tx_skb, 2); |
1da177e4 | 617 | |
1b0fee7d | 618 | frame->caddr = self->caddr; |
efd50290 | 619 | frame->control = RD_RSP | PF_BIT; |
1da177e4 LT |
620 | |
621 | irlap_queue_xmit(self, tx_skb); | |
622 | } | |
623 | ||
624 | /* | |
625 | * Function irlap_recv_rr_frame (skb, info) | |
626 | * | |
627 | * Received RR (Receive Ready) frame from peer station, no harm in | |
628 | * making it inline since its called only from one single place | |
629 | * (irlap_driver_rcv). | |
630 | */ | |
631 | static inline void irlap_recv_rr_frame(struct irlap_cb *self, | |
632 | struct sk_buff *skb, | |
633 | struct irlap_info *info, int command) | |
634 | { | |
635 | info->nr = skb->data[1] >> 5; | |
636 | ||
637 | /* Check if this is a command or a response frame */ | |
638 | if (command) | |
639 | irlap_do_event(self, RECV_RR_CMD, skb, info); | |
640 | else | |
641 | irlap_do_event(self, RECV_RR_RSP, skb, info); | |
642 | } | |
643 | ||
644 | /* | |
645 | * Function irlap_recv_rnr_frame (self, skb, info) | |
646 | * | |
647 | * Received RNR (Receive Not Ready) frame from peer station | |
648 | * | |
649 | */ | |
650 | static void irlap_recv_rnr_frame(struct irlap_cb *self, struct sk_buff *skb, | |
651 | struct irlap_info *info, int command) | |
652 | { | |
653 | info->nr = skb->data[1] >> 5; | |
654 | ||
955a9d20 | 655 | pr_debug("%s(), nr=%d, %ld\n", __func__, info->nr, jiffies); |
1da177e4 LT |
656 | |
657 | if (command) | |
658 | irlap_do_event(self, RECV_RNR_CMD, skb, info); | |
659 | else | |
660 | irlap_do_event(self, RECV_RNR_RSP, skb, info); | |
661 | } | |
662 | ||
663 | static void irlap_recv_rej_frame(struct irlap_cb *self, struct sk_buff *skb, | |
664 | struct irlap_info *info, int command) | |
665 | { | |
1da177e4 LT |
666 | info->nr = skb->data[1] >> 5; |
667 | ||
668 | /* Check if this is a command or a response frame */ | |
669 | if (command) | |
670 | irlap_do_event(self, RECV_REJ_CMD, skb, info); | |
671 | else | |
672 | irlap_do_event(self, RECV_REJ_RSP, skb, info); | |
673 | } | |
674 | ||
675 | static void irlap_recv_srej_frame(struct irlap_cb *self, struct sk_buff *skb, | |
676 | struct irlap_info *info, int command) | |
677 | { | |
1da177e4 LT |
678 | info->nr = skb->data[1] >> 5; |
679 | ||
680 | /* Check if this is a command or a response frame */ | |
681 | if (command) | |
682 | irlap_do_event(self, RECV_SREJ_CMD, skb, info); | |
683 | else | |
684 | irlap_do_event(self, RECV_SREJ_RSP, skb, info); | |
685 | } | |
686 | ||
687 | static void irlap_recv_disc_frame(struct irlap_cb *self, struct sk_buff *skb, | |
688 | struct irlap_info *info, int command) | |
689 | { | |
1da177e4 LT |
690 | /* Check if this is a command or a response frame */ |
691 | if (command) | |
692 | irlap_do_event(self, RECV_DISC_CMD, skb, info); | |
693 | else | |
694 | irlap_do_event(self, RECV_RD_RSP, skb, info); | |
695 | } | |
696 | ||
697 | /* | |
698 | * Function irlap_recv_ua_frame (skb, frame) | |
699 | * | |
700 | * Received UA (Unnumbered Acknowledgement) frame | |
701 | * | |
702 | */ | |
703 | static inline void irlap_recv_ua_frame(struct irlap_cb *self, | |
704 | struct sk_buff *skb, | |
705 | struct irlap_info *info) | |
706 | { | |
707 | irlap_do_event(self, RECV_UA_RSP, skb, info); | |
708 | } | |
709 | ||
710 | /* | |
711 | * Function irlap_send_data_primary(self, skb) | |
712 | * | |
713 | * Send I-frames as the primary station but without the poll bit set | |
714 | * | |
715 | */ | |
716 | void irlap_send_data_primary(struct irlap_cb *self, struct sk_buff *skb) | |
717 | { | |
718 | struct sk_buff *tx_skb; | |
719 | ||
720 | if (skb->data[1] == I_FRAME) { | |
721 | ||
722 | /* | |
723 | * Insert frame sequence number (Vs) in control field before | |
724 | * inserting into transmit window queue. | |
725 | */ | |
726 | skb->data[1] = I_FRAME | (self->vs << 1); | |
727 | ||
728 | /* | |
729 | * Insert frame in store, in case of retransmissions | |
730 | * Increase skb reference count, see irlap_do_event() | |
731 | */ | |
732 | skb_get(skb); | |
733 | skb_queue_tail(&self->wx_list, skb); | |
734 | ||
735 | /* Copy buffer */ | |
736 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
737 | if (tx_skb == NULL) { | |
738 | return; | |
739 | } | |
740 | ||
741 | self->vs = (self->vs + 1) % 8; | |
742 | self->ack_required = FALSE; | |
743 | self->window -= 1; | |
744 | ||
745 | irlap_send_i_frame( self, tx_skb, CMD_FRAME); | |
746 | } else { | |
955a9d20 | 747 | pr_debug("%s(), sending unreliable frame\n", __func__); |
1da177e4 LT |
748 | irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME); |
749 | self->window -= 1; | |
750 | } | |
751 | } | |
752 | /* | |
753 | * Function irlap_send_data_primary_poll (self, skb) | |
754 | * | |
755 | * Send I(nformation) frame as primary with poll bit set | |
756 | */ | |
757 | void irlap_send_data_primary_poll(struct irlap_cb *self, struct sk_buff *skb) | |
758 | { | |
759 | struct sk_buff *tx_skb; | |
760 | int transmission_time; | |
761 | ||
762 | /* Stop P timer */ | |
763 | del_timer(&self->poll_timer); | |
764 | ||
765 | /* Is this reliable or unreliable data? */ | |
766 | if (skb->data[1] == I_FRAME) { | |
767 | ||
768 | /* | |
769 | * Insert frame sequence number (Vs) in control field before | |
770 | * inserting into transmit window queue. | |
771 | */ | |
772 | skb->data[1] = I_FRAME | (self->vs << 1); | |
773 | ||
774 | /* | |
775 | * Insert frame in store, in case of retransmissions | |
776 | * Increase skb reference count, see irlap_do_event() | |
777 | */ | |
778 | skb_get(skb); | |
779 | skb_queue_tail(&self->wx_list, skb); | |
780 | ||
781 | /* Copy buffer */ | |
782 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
783 | if (tx_skb == NULL) { | |
784 | return; | |
785 | } | |
786 | ||
787 | /* | |
788 | * Set poll bit if necessary. We do this to the copied | |
789 | * skb, since retransmitted need to set or clear the poll | |
790 | * bit depending on when they are sent. | |
791 | */ | |
792 | tx_skb->data[1] |= PF_BIT; | |
793 | ||
794 | self->vs = (self->vs + 1) % 8; | |
795 | self->ack_required = FALSE; | |
796 | ||
c0cfe7fa | 797 | irlap_next_state(self, LAP_NRM_P); |
1da177e4 LT |
798 | irlap_send_i_frame(self, tx_skb, CMD_FRAME); |
799 | } else { | |
955a9d20 | 800 | pr_debug("%s(), sending unreliable frame\n", __func__); |
1da177e4 LT |
801 | |
802 | if (self->ack_required) { | |
803 | irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME); | |
c0cfe7fa | 804 | irlap_next_state(self, LAP_NRM_P); |
1da177e4 LT |
805 | irlap_send_rr_frame(self, CMD_FRAME); |
806 | self->ack_required = FALSE; | |
807 | } else { | |
808 | skb->data[1] |= PF_BIT; | |
c0cfe7fa | 809 | irlap_next_state(self, LAP_NRM_P); |
1da177e4 LT |
810 | irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME); |
811 | } | |
812 | } | |
813 | ||
814 | /* How much time we took for transmission of all frames. | |
815 | * We don't know, so let assume we used the full window. Jean II */ | |
816 | transmission_time = self->final_timeout; | |
817 | ||
818 | /* Reset parameter so that we can fill next window */ | |
819 | self->window = self->window_size; | |
820 | ||
821 | #ifdef CONFIG_IRDA_DYNAMIC_WINDOW | |
822 | /* Remove what we have not used. Just do a prorata of the | |
823 | * bytes left in window to window capacity. | |
824 | * See max_line_capacities[][] in qos.c for details. Jean II */ | |
825 | transmission_time -= (self->final_timeout * self->bytes_left | |
826 | / self->line_capacity); | |
955a9d20 JP |
827 | pr_debug("%s() adjusting transmission_time : ft=%d, bl=%d, lc=%d -> tt=%d\n", |
828 | __func__, self->final_timeout, self->bytes_left, | |
829 | self->line_capacity, transmission_time); | |
1da177e4 LT |
830 | |
831 | /* We are allowed to transmit a maximum number of bytes again. */ | |
832 | self->bytes_left = self->line_capacity; | |
833 | #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */ | |
834 | ||
835 | /* | |
836 | * The network layer has a intermediate buffer between IrLAP | |
837 | * and the IrDA driver which can contain 8 frames. So, even | |
838 | * though IrLAP is currently sending the *last* frame of the | |
839 | * tx-window, the driver most likely has only just started | |
840 | * sending the *first* frame of the same tx-window. | |
25985edc | 841 | * I.e. we are always at the very beginning of or Tx window. |
1da177e4 LT |
842 | * Now, we are supposed to set the final timer from the end |
843 | * of our tx-window to let the other peer reply. So, we need | |
844 | * to add extra time to compensate for the fact that we | |
845 | * are really at the start of tx-window, otherwise the final timer | |
846 | * might expire before he can answer... | |
847 | * Jean II | |
848 | */ | |
849 | irlap_start_final_timer(self, self->final_timeout + transmission_time); | |
850 | ||
851 | /* | |
852 | * The clever amongst you might ask why we do this adjustement | |
853 | * only here, and not in all the other cases in irlap_event.c. | |
854 | * In all those other case, we only send a very short management | |
855 | * frame (few bytes), so the adjustement would be lost in the | |
856 | * noise... | |
857 | * The exception of course is irlap_resend_rejected_frame(). | |
858 | * Jean II */ | |
859 | } | |
860 | ||
861 | /* | |
862 | * Function irlap_send_data_secondary_final (self, skb) | |
863 | * | |
864 | * Send I(nformation) frame as secondary with final bit set | |
865 | * | |
866 | */ | |
867 | void irlap_send_data_secondary_final(struct irlap_cb *self, | |
868 | struct sk_buff *skb) | |
869 | { | |
870 | struct sk_buff *tx_skb = NULL; | |
871 | ||
872 | IRDA_ASSERT(self != NULL, return;); | |
873 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
874 | IRDA_ASSERT(skb != NULL, return;); | |
875 | ||
876 | /* Is this reliable or unreliable data? */ | |
877 | if (skb->data[1] == I_FRAME) { | |
878 | ||
879 | /* | |
880 | * Insert frame sequence number (Vs) in control field before | |
881 | * inserting into transmit window queue. | |
882 | */ | |
883 | skb->data[1] = I_FRAME | (self->vs << 1); | |
884 | ||
885 | /* | |
886 | * Insert frame in store, in case of retransmissions | |
887 | * Increase skb reference count, see irlap_do_event() | |
888 | */ | |
889 | skb_get(skb); | |
890 | skb_queue_tail(&self->wx_list, skb); | |
891 | ||
892 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
893 | if (tx_skb == NULL) { | |
894 | return; | |
895 | } | |
896 | ||
897 | tx_skb->data[1] |= PF_BIT; | |
898 | ||
899 | self->vs = (self->vs + 1) % 8; | |
900 | self->ack_required = FALSE; | |
901 | ||
902 | irlap_send_i_frame(self, tx_skb, RSP_FRAME); | |
903 | } else { | |
904 | if (self->ack_required) { | |
905 | irlap_send_ui_frame(self, skb_get(skb), self->caddr, RSP_FRAME); | |
906 | irlap_send_rr_frame(self, RSP_FRAME); | |
907 | self->ack_required = FALSE; | |
908 | } else { | |
909 | skb->data[1] |= PF_BIT; | |
910 | irlap_send_ui_frame(self, skb_get(skb), self->caddr, RSP_FRAME); | |
911 | } | |
912 | } | |
913 | ||
914 | self->window = self->window_size; | |
915 | #ifdef CONFIG_IRDA_DYNAMIC_WINDOW | |
916 | /* We are allowed to transmit a maximum number of bytes again. */ | |
917 | self->bytes_left = self->line_capacity; | |
918 | #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */ | |
919 | ||
920 | irlap_start_wd_timer(self, self->wd_timeout); | |
921 | } | |
922 | ||
923 | /* | |
924 | * Function irlap_send_data_secondary (self, skb) | |
925 | * | |
926 | * Send I(nformation) frame as secondary without final bit set | |
927 | * | |
928 | */ | |
929 | void irlap_send_data_secondary(struct irlap_cb *self, struct sk_buff *skb) | |
930 | { | |
931 | struct sk_buff *tx_skb = NULL; | |
932 | ||
933 | /* Is this reliable or unreliable data? */ | |
934 | if (skb->data[1] == I_FRAME) { | |
935 | ||
936 | /* | |
937 | * Insert frame sequence number (Vs) in control field before | |
938 | * inserting into transmit window queue. | |
939 | */ | |
940 | skb->data[1] = I_FRAME | (self->vs << 1); | |
941 | ||
942 | /* | |
943 | * Insert frame in store, in case of retransmissions | |
944 | * Increase skb reference count, see irlap_do_event() | |
945 | */ | |
946 | skb_get(skb); | |
947 | skb_queue_tail(&self->wx_list, skb); | |
948 | ||
949 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
950 | if (tx_skb == NULL) { | |
951 | return; | |
952 | } | |
953 | ||
954 | self->vs = (self->vs + 1) % 8; | |
955 | self->ack_required = FALSE; | |
956 | self->window -= 1; | |
957 | ||
958 | irlap_send_i_frame(self, tx_skb, RSP_FRAME); | |
959 | } else { | |
960 | irlap_send_ui_frame(self, skb_get(skb), self->caddr, RSP_FRAME); | |
961 | self->window -= 1; | |
962 | } | |
963 | } | |
964 | ||
965 | /* | |
966 | * Function irlap_resend_rejected_frames (nr) | |
967 | * | |
968 | * Resend frames which has not been acknowledged. Should be safe to | |
969 | * traverse the list without locking it since this function will only be | |
970 | * called from interrupt context (BH) | |
971 | */ | |
972 | void irlap_resend_rejected_frames(struct irlap_cb *self, int command) | |
973 | { | |
974 | struct sk_buff *tx_skb; | |
975 | struct sk_buff *skb; | |
1da177e4 LT |
976 | |
977 | IRDA_ASSERT(self != NULL, return;); | |
978 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
979 | ||
1da177e4 | 980 | /* Resend unacknowledged frame(s) */ |
528be7ff | 981 | skb_queue_walk(&self->wx_list, skb) { |
1da177e4 LT |
982 | irlap_wait_min_turn_around(self, &self->qos_tx); |
983 | ||
984 | /* We copy the skb to be retransmitted since we will have to | |
985 | * modify it. Cloning will confuse packet sniffers | |
986 | */ | |
987 | /* tx_skb = skb_clone( skb, GFP_ATOMIC); */ | |
988 | tx_skb = skb_copy(skb, GFP_ATOMIC); | |
989 | if (!tx_skb) { | |
955a9d20 | 990 | pr_debug("%s(), unable to copy\n", __func__); |
1da177e4 LT |
991 | return; |
992 | } | |
1da177e4 LT |
993 | |
994 | /* Clear old Nr field + poll bit */ | |
995 | tx_skb->data[1] &= 0x0f; | |
996 | ||
997 | /* | |
998 | * Set poll bit on the last frame retransmitted | |
999 | */ | |
528be7ff | 1000 | if (skb_queue_is_last(&self->wx_list, skb)) |
1da177e4 LT |
1001 | tx_skb->data[1] |= PF_BIT; /* Set p/f bit */ |
1002 | else | |
1003 | tx_skb->data[1] &= ~PF_BIT; /* Clear p/f bit */ | |
1004 | ||
1005 | irlap_send_i_frame(self, tx_skb, command); | |
1da177e4 LT |
1006 | } |
1007 | #if 0 /* Not yet */ | |
1008 | /* | |
1009 | * We can now fill the window with additional data frames | |
1010 | */ | |
b03efcfb | 1011 | while (!skb_queue_empty(&self->txq)) { |
1da177e4 | 1012 | |
955a9d20 | 1013 | pr_debug("%s(), sending additional frames!\n", __func__); |
b03efcfb | 1014 | if (self->window > 0) { |
1da177e4 LT |
1015 | skb = skb_dequeue( &self->txq); |
1016 | IRDA_ASSERT(skb != NULL, return;); | |
1017 | ||
1018 | /* | |
1019 | * If send window > 1 then send frame with pf | |
1020 | * bit cleared | |
1021 | */ | |
1022 | if ((self->window > 1) && | |
b03efcfb | 1023 | !skb_queue_empty(&self->txq)) { |
1da177e4 LT |
1024 | irlap_send_data_primary(self, skb); |
1025 | } else { | |
1026 | irlap_send_data_primary_poll(self, skb); | |
1027 | } | |
1028 | kfree_skb(skb); | |
1029 | } | |
1030 | } | |
1031 | #endif | |
1032 | } | |
1033 | ||
1034 | void irlap_resend_rejected_frame(struct irlap_cb *self, int command) | |
1035 | { | |
1036 | struct sk_buff *tx_skb; | |
1037 | struct sk_buff *skb; | |
1038 | ||
1039 | IRDA_ASSERT(self != NULL, return;); | |
1040 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
1041 | ||
1042 | /* Resend unacknowledged frame(s) */ | |
1043 | skb = skb_peek(&self->wx_list); | |
1044 | if (skb != NULL) { | |
1045 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1046 | ||
1047 | /* We copy the skb to be retransmitted since we will have to | |
1048 | * modify it. Cloning will confuse packet sniffers | |
1049 | */ | |
1050 | /* tx_skb = skb_clone( skb, GFP_ATOMIC); */ | |
1051 | tx_skb = skb_copy(skb, GFP_ATOMIC); | |
1052 | if (!tx_skb) { | |
955a9d20 | 1053 | pr_debug("%s(), unable to copy\n", __func__); |
1da177e4 LT |
1054 | return; |
1055 | } | |
1da177e4 LT |
1056 | |
1057 | /* Clear old Nr field + poll bit */ | |
1058 | tx_skb->data[1] &= 0x0f; | |
1059 | ||
1060 | /* Set poll/final bit */ | |
1061 | tx_skb->data[1] |= PF_BIT; /* Set p/f bit */ | |
1062 | ||
1063 | irlap_send_i_frame(self, tx_skb, command); | |
1064 | } | |
1065 | } | |
1066 | ||
1067 | /* | |
1068 | * Function irlap_send_ui_frame (self, skb, command) | |
1069 | * | |
1070 | * Contruct and transmit an Unnumbered Information (UI) frame | |
1071 | * | |
1072 | */ | |
1073 | void irlap_send_ui_frame(struct irlap_cb *self, struct sk_buff *skb, | |
1074 | __u8 caddr, int command) | |
1075 | { | |
1da177e4 LT |
1076 | IRDA_ASSERT(self != NULL, return;); |
1077 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
1078 | IRDA_ASSERT(skb != NULL, return;); | |
1079 | ||
1080 | /* Insert connection address */ | |
1081 | skb->data[0] = caddr | ((command) ? CMD_FRAME : 0); | |
1082 | ||
1083 | irlap_queue_xmit(self, skb); | |
1084 | } | |
1085 | ||
1086 | /* | |
1087 | * Function irlap_send_i_frame (skb) | |
1088 | * | |
1089 | * Contruct and transmit Information (I) frame | |
1090 | */ | |
1091 | static void irlap_send_i_frame(struct irlap_cb *self, struct sk_buff *skb, | |
1092 | int command) | |
1093 | { | |
1094 | /* Insert connection address */ | |
1095 | skb->data[0] = self->caddr; | |
1096 | skb->data[0] |= (command) ? CMD_FRAME : 0; | |
1097 | ||
1098 | /* Insert next to receive (Vr) */ | |
1099 | skb->data[1] |= (self->vr << 5); /* insert nr */ | |
1100 | ||
1101 | irlap_queue_xmit(self, skb); | |
1102 | } | |
1103 | ||
1104 | /* | |
1105 | * Function irlap_recv_i_frame (skb, frame) | |
1106 | * | |
1107 | * Receive and parse an I (Information) frame, no harm in making it inline | |
1108 | * since it's called only from one single place (irlap_driver_rcv). | |
1109 | */ | |
1110 | static inline void irlap_recv_i_frame(struct irlap_cb *self, | |
1111 | struct sk_buff *skb, | |
1112 | struct irlap_info *info, int command) | |
1113 | { | |
1114 | info->nr = skb->data[1] >> 5; /* Next to receive */ | |
1115 | info->pf = skb->data[1] & PF_BIT; /* Final bit */ | |
1116 | info->ns = (skb->data[1] >> 1) & 0x07; /* Next to send */ | |
1117 | ||
1118 | /* Check if this is a command or a response frame */ | |
1119 | if (command) | |
1120 | irlap_do_event(self, RECV_I_CMD, skb, info); | |
1121 | else | |
1122 | irlap_do_event(self, RECV_I_RSP, skb, info); | |
1123 | } | |
1124 | ||
1125 | /* | |
1126 | * Function irlap_recv_ui_frame (self, skb, info) | |
1127 | * | |
1128 | * Receive and parse an Unnumbered Information (UI) frame | |
1129 | * | |
1130 | */ | |
1131 | static void irlap_recv_ui_frame(struct irlap_cb *self, struct sk_buff *skb, | |
1132 | struct irlap_info *info) | |
1133 | { | |
1da177e4 LT |
1134 | info->pf = skb->data[1] & PF_BIT; /* Final bit */ |
1135 | ||
1136 | irlap_do_event(self, RECV_UI_FRAME, skb, info); | |
1137 | } | |
1138 | ||
1139 | /* | |
1140 | * Function irlap_recv_frmr_frame (skb, frame) | |
1141 | * | |
1142 | * Received Frame Reject response. | |
1143 | * | |
1144 | */ | |
1145 | static void irlap_recv_frmr_frame(struct irlap_cb *self, struct sk_buff *skb, | |
1146 | struct irlap_info *info) | |
1147 | { | |
1148 | __u8 *frame; | |
1149 | int w, x, y, z; | |
1150 | ||
1da177e4 LT |
1151 | IRDA_ASSERT(self != NULL, return;); |
1152 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
1153 | IRDA_ASSERT(skb != NULL, return;); | |
1154 | IRDA_ASSERT(info != NULL, return;); | |
1155 | ||
1156 | if (!pskb_may_pull(skb, 4)) { | |
6c91023d | 1157 | net_err_ratelimited("%s: frame too short!\n", __func__); |
1da177e4 LT |
1158 | return; |
1159 | } | |
1160 | ||
1161 | frame = skb->data; | |
1162 | ||
1163 | info->nr = frame[2] >> 5; /* Next to receive */ | |
1164 | info->pf = frame[2] & PF_BIT; /* Final bit */ | |
1165 | info->ns = (frame[2] >> 1) & 0x07; /* Next to send */ | |
1166 | ||
1167 | w = frame[3] & 0x01; | |
1168 | x = frame[3] & 0x02; | |
1169 | y = frame[3] & 0x04; | |
1170 | z = frame[3] & 0x08; | |
1171 | ||
1172 | if (w) { | |
955a9d20 | 1173 | pr_debug("Rejected control field is undefined or not implemented\n"); |
1da177e4 LT |
1174 | } |
1175 | if (x) { | |
955a9d20 | 1176 | pr_debug("Rejected control field was invalid because it contained a non permitted I field\n"); |
1da177e4 LT |
1177 | } |
1178 | if (y) { | |
955a9d20 | 1179 | pr_debug("Received I field exceeded the maximum negotiated for the existing connection or exceeded the maximum this station supports if no connection exists\n"); |
1da177e4 LT |
1180 | } |
1181 | if (z) { | |
955a9d20 | 1182 | pr_debug("Rejected control field control field contained an invalid Nr count\n"); |
1da177e4 LT |
1183 | } |
1184 | irlap_do_event(self, RECV_FRMR_RSP, skb, info); | |
1185 | } | |
1186 | ||
1187 | /* | |
1188 | * Function irlap_send_test_frame (self, daddr) | |
1189 | * | |
1190 | * Send a test frame response | |
1191 | * | |
1192 | */ | |
1193 | void irlap_send_test_frame(struct irlap_cb *self, __u8 caddr, __u32 daddr, | |
1194 | struct sk_buff *cmd) | |
1195 | { | |
1196 | struct sk_buff *tx_skb; | |
1197 | struct test_frame *frame; | |
1198 | __u8 *info; | |
1199 | ||
1b0fee7d | 1200 | tx_skb = alloc_skb(cmd->len + sizeof(struct test_frame), GFP_ATOMIC); |
1da177e4 LT |
1201 | if (!tx_skb) |
1202 | return; | |
1203 | ||
1204 | /* Broadcast frames must include saddr and daddr fields */ | |
1205 | if (caddr == CBROADCAST) { | |
1206 | frame = (struct test_frame *) | |
1207 | skb_put(tx_skb, sizeof(struct test_frame)); | |
1208 | ||
1209 | /* Insert the swapped addresses */ | |
1210 | frame->saddr = cpu_to_le32(self->saddr); | |
1211 | frame->daddr = cpu_to_le32(daddr); | |
1212 | } else | |
1213 | frame = (struct test_frame *) skb_put(tx_skb, LAP_ADDR_HEADER + LAP_CTRL_HEADER); | |
1214 | ||
1215 | frame->caddr = caddr; | |
1216 | frame->control = TEST_RSP | PF_BIT; | |
1217 | ||
1218 | /* Copy info */ | |
1219 | info = skb_put(tx_skb, cmd->len); | |
1220 | memcpy(info, cmd->data, cmd->len); | |
1221 | ||
1222 | /* Return to sender */ | |
1223 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1224 | irlap_queue_xmit(self, tx_skb); | |
1225 | } | |
1226 | ||
1227 | /* | |
1228 | * Function irlap_recv_test_frame (self, skb) | |
1229 | * | |
1230 | * Receive a test frame | |
1231 | * | |
1232 | */ | |
1233 | static void irlap_recv_test_frame(struct irlap_cb *self, struct sk_buff *skb, | |
1234 | struct irlap_info *info, int command) | |
1235 | { | |
1236 | struct test_frame *frame; | |
1237 | ||
1da177e4 | 1238 | if (!pskb_may_pull(skb, sizeof(*frame))) { |
6c91023d | 1239 | net_err_ratelimited("%s: frame too short!\n", __func__); |
1da177e4 LT |
1240 | return; |
1241 | } | |
1242 | frame = (struct test_frame *) skb->data; | |
1243 | ||
1244 | /* Broadcast frames must carry saddr and daddr fields */ | |
1245 | if (info->caddr == CBROADCAST) { | |
1246 | if (skb->len < sizeof(struct test_frame)) { | |
955a9d20 JP |
1247 | pr_debug("%s() test frame too short!\n", |
1248 | __func__); | |
1da177e4 LT |
1249 | return; |
1250 | } | |
1251 | ||
1252 | /* Read and swap addresses */ | |
1253 | info->daddr = le32_to_cpu(frame->saddr); | |
1254 | info->saddr = le32_to_cpu(frame->daddr); | |
1255 | ||
1256 | /* Make sure frame is addressed to us */ | |
1257 | if ((info->saddr != self->saddr) && | |
1258 | (info->saddr != BROADCAST)) { | |
1259 | return; | |
1260 | } | |
1261 | } | |
1262 | ||
1263 | if (command) | |
1264 | irlap_do_event(self, RECV_TEST_CMD, skb, info); | |
1265 | else | |
1266 | irlap_do_event(self, RECV_TEST_RSP, skb, info); | |
1267 | } | |
1268 | ||
1269 | /* | |
1270 | * Function irlap_driver_rcv (skb, netdev, ptype) | |
1271 | * | |
1272 | * Called when a frame is received. Dispatches the right receive function | |
1273 | * for processing of the frame. | |
1274 | * | |
1275 | * Note on skb management : | |
1276 | * After calling the higher layers of the IrDA stack, we always | |
1277 | * kfree() the skb, which drop the reference count (and potentially | |
1278 | * destroy it). | |
1279 | * If a higher layer of the stack want to keep the skb around (to put | |
1280 | * in a queue or pass it to the higher layer), it will need to use | |
1281 | * skb_get() to keep a reference on it. This is usually done at the | |
1282 | * LMP level in irlmp.c. | |
1283 | * Jean II | |
1284 | */ | |
1285 | int irlap_driver_rcv(struct sk_buff *skb, struct net_device *dev, | |
f2ccd8fa | 1286 | struct packet_type *ptype, struct net_device *orig_dev) |
1da177e4 LT |
1287 | { |
1288 | struct irlap_info info; | |
1289 | struct irlap_cb *self; | |
1290 | int command; | |
1291 | __u8 control; | |
e780f1c3 | 1292 | int ret = -1; |
1da177e4 | 1293 | |
721499e8 | 1294 | if (!net_eq(dev_net(dev), &init_net)) |
e730c155 EB |
1295 | goto out; |
1296 | ||
1da177e4 LT |
1297 | /* FIXME: should we get our own field? */ |
1298 | self = (struct irlap_cb *) dev->atalk_ptr; | |
1299 | ||
1300 | /* If the net device is down, then IrLAP is gone! */ | |
e780f1c3 IJ |
1301 | if (!self || self->magic != LAP_MAGIC) |
1302 | goto err; | |
1da177e4 LT |
1303 | |
1304 | /* We are no longer an "old" protocol, so we need to handle | |
1305 | * share and non linear skbs. This should never happen, so | |
1306 | * we don't need to be clever about it. Jean II */ | |
1307 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) { | |
6c91023d | 1308 | net_err_ratelimited("%s: can't clone shared skb!\n", __func__); |
e780f1c3 | 1309 | goto err; |
1da177e4 LT |
1310 | } |
1311 | ||
1312 | /* Check if frame is large enough for parsing */ | |
1313 | if (!pskb_may_pull(skb, 2)) { | |
6c91023d | 1314 | net_err_ratelimited("%s: frame too short!\n", __func__); |
e780f1c3 | 1315 | goto err; |
1da177e4 LT |
1316 | } |
1317 | ||
1318 | command = skb->data[0] & CMD_FRAME; | |
1319 | info.caddr = skb->data[0] & CBROADCAST; | |
1320 | ||
1321 | info.pf = skb->data[1] & PF_BIT; | |
1322 | info.control = skb->data[1] & ~PF_BIT; /* Mask away poll/final bit */ | |
1323 | ||
1324 | control = info.control; | |
1325 | ||
1326 | /* First we check if this frame has a valid connection address */ | |
1327 | if ((info.caddr != self->caddr) && (info.caddr != CBROADCAST)) { | |
955a9d20 JP |
1328 | pr_debug("%s(), wrong connection address!\n", |
1329 | __func__); | |
1da177e4 LT |
1330 | goto out; |
1331 | } | |
1332 | /* | |
1333 | * Optimize for the common case and check if the frame is an | |
1334 | * I(nformation) frame. Only I-frames have bit 0 set to 0 | |
1335 | */ | |
1336 | if (~control & 0x01) { | |
1337 | irlap_recv_i_frame(self, skb, &info, command); | |
1338 | goto out; | |
1339 | } | |
1340 | /* | |
1341 | * We now check is the frame is an S(upervisory) frame. Only | |
1342 | * S-frames have bit 0 set to 1 and bit 1 set to 0 | |
1343 | */ | |
1344 | if (~control & 0x02) { | |
1345 | /* | |
1346 | * Received S(upervisory) frame, check which frame type it is | |
1347 | * only the first nibble is of interest | |
1348 | */ | |
1349 | switch (control & 0x0f) { | |
1350 | case RR: | |
1351 | irlap_recv_rr_frame(self, skb, &info, command); | |
1352 | break; | |
1353 | case RNR: | |
1354 | irlap_recv_rnr_frame(self, skb, &info, command); | |
1355 | break; | |
1356 | case REJ: | |
1357 | irlap_recv_rej_frame(self, skb, &info, command); | |
1358 | break; | |
1359 | case SREJ: | |
1360 | irlap_recv_srej_frame(self, skb, &info, command); | |
1361 | break; | |
1362 | default: | |
6c91023d JP |
1363 | net_warn_ratelimited("%s: Unknown S-frame %02x received!\n", |
1364 | __func__, info.control); | |
1da177e4 LT |
1365 | break; |
1366 | } | |
1367 | goto out; | |
1368 | } | |
1369 | /* | |
1370 | * This must be a C(ontrol) frame | |
1371 | */ | |
1372 | switch (control) { | |
1373 | case XID_RSP: | |
1374 | irlap_recv_discovery_xid_rsp(self, skb, &info); | |
1375 | break; | |
1376 | case XID_CMD: | |
1377 | irlap_recv_discovery_xid_cmd(self, skb, &info); | |
1378 | break; | |
1379 | case SNRM_CMD: | |
1380 | irlap_recv_snrm_cmd(self, skb, &info); | |
1381 | break; | |
1382 | case DM_RSP: | |
1383 | irlap_do_event(self, RECV_DM_RSP, skb, &info); | |
1384 | break; | |
1385 | case DISC_CMD: /* And RD_RSP since they have the same value */ | |
1386 | irlap_recv_disc_frame(self, skb, &info, command); | |
1387 | break; | |
1388 | case TEST_CMD: | |
1389 | irlap_recv_test_frame(self, skb, &info, command); | |
1390 | break; | |
1391 | case UA_RSP: | |
1392 | irlap_recv_ua_frame(self, skb, &info); | |
1393 | break; | |
1394 | case FRMR_RSP: | |
1395 | irlap_recv_frmr_frame(self, skb, &info); | |
1396 | break; | |
1397 | case UI_FRAME: | |
1398 | irlap_recv_ui_frame(self, skb, &info); | |
1399 | break; | |
1400 | default: | |
6c91023d JP |
1401 | net_warn_ratelimited("%s: Unknown frame %02x received!\n", |
1402 | __func__, info.control); | |
1da177e4 LT |
1403 | break; |
1404 | } | |
1405 | out: | |
e780f1c3 IJ |
1406 | ret = 0; |
1407 | err: | |
1da177e4 LT |
1408 | /* Always drop our reference on the skb */ |
1409 | dev_kfree_skb(skb); | |
e780f1c3 | 1410 | return ret; |
1da177e4 | 1411 | } |