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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
099dc4fb DS |
2 | /* |
3 | * IPWireless 3G PCMCIA Network Driver | |
4 | * | |
5 | * Original code | |
6 | * by Stephen Blackheath <stephen@blacksapphire.com>, | |
7 | * Ben Martel <benm@symmetric.co.nz> | |
8 | * | |
9 | * Copyrighted as follows: | |
10 | * Copyright (C) 2004 by Symmetric Systems Ltd (NZ) | |
11 | * | |
12 | * Various driver changes and rewrites, port to new kernels | |
13 | * Copyright (C) 2006-2007 Jiri Kosina | |
14 | * | |
15 | * Misc code cleanups and updates | |
16 | * Copyright (C) 2007 David Sterba | |
17 | */ | |
18 | ||
19 | #include <linux/interrupt.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/mutex.h> | |
22 | #include <linux/netdevice.h> | |
23 | #include <linux/ppp_channel.h> | |
24 | #include <linux/ppp_defs.h> | |
5a0e3ad6 | 25 | #include <linux/slab.h> |
4b32da2b | 26 | #include <linux/ppp-ioctl.h> |
099dc4fb DS |
27 | #include <linux/skbuff.h> |
28 | ||
29 | #include "network.h" | |
30 | #include "hardware.h" | |
31 | #include "main.h" | |
32 | #include "tty.h" | |
33 | ||
099dc4fb DS |
34 | #define MAX_ASSOCIATED_TTYS 2 |
35 | ||
36 | #define SC_RCV_BITS (SC_RCV_B7_1|SC_RCV_B7_0|SC_RCV_ODDP|SC_RCV_EVNP) | |
37 | ||
38 | struct ipw_network { | |
39 | /* Hardware context, used for calls to hardware layer. */ | |
40 | struct ipw_hardware *hardware; | |
41 | /* Context for kernel 'generic_ppp' functionality */ | |
42 | struct ppp_channel *ppp_channel; | |
43 | /* tty context connected with IPW console */ | |
44 | struct ipw_tty *associated_ttys[NO_OF_IPW_CHANNELS][MAX_ASSOCIATED_TTYS]; | |
45 | /* True if ppp needs waking up once we're ready to xmit */ | |
46 | int ppp_blocked; | |
47 | /* Number of packets queued up in hardware module. */ | |
48 | int outgoing_packets_queued; | |
49 | /* Spinlock to avoid interrupts during shutdown */ | |
63c4dbd1 | 50 | spinlock_t lock; |
099dc4fb DS |
51 | struct mutex close_lock; |
52 | ||
53 | /* PPP ioctl data, not actually used anywere */ | |
54 | unsigned int flags; | |
55 | unsigned int rbits; | |
56 | u32 xaccm[8]; | |
57 | u32 raccm; | |
58 | int mru; | |
59 | ||
60 | int shutting_down; | |
61 | unsigned int ras_control_lines; | |
62 | ||
63 | struct work_struct work_go_online; | |
64 | struct work_struct work_go_offline; | |
65 | }; | |
66 | ||
099dc4fb DS |
67 | static void notify_packet_sent(void *callback_data, unsigned int packet_length) |
68 | { | |
69 | struct ipw_network *network = callback_data; | |
70 | unsigned long flags; | |
71 | ||
63c4dbd1 | 72 | spin_lock_irqsave(&network->lock, flags); |
099dc4fb DS |
73 | network->outgoing_packets_queued--; |
74 | if (network->ppp_channel != NULL) { | |
75 | if (network->ppp_blocked) { | |
76 | network->ppp_blocked = 0; | |
63c4dbd1 | 77 | spin_unlock_irqrestore(&network->lock, flags); |
099dc4fb DS |
78 | ppp_output_wakeup(network->ppp_channel); |
79 | if (ipwireless_debug) | |
bee9c7c0 | 80 | printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME |
099dc4fb DS |
81 | ": ppp unblocked\n"); |
82 | } else | |
63c4dbd1 | 83 | spin_unlock_irqrestore(&network->lock, flags); |
099dc4fb | 84 | } else |
63c4dbd1 | 85 | spin_unlock_irqrestore(&network->lock, flags); |
099dc4fb DS |
86 | } |
87 | ||
88 | /* | |
89 | * Called by the ppp system when it has a packet to send to the hardware. | |
90 | */ | |
91 | static int ipwireless_ppp_start_xmit(struct ppp_channel *ppp_channel, | |
92 | struct sk_buff *skb) | |
93 | { | |
94 | struct ipw_network *network = ppp_channel->private; | |
95 | unsigned long flags; | |
96 | ||
63c4dbd1 | 97 | spin_lock_irqsave(&network->lock, flags); |
2e713165 | 98 | if (network->outgoing_packets_queued < ipwireless_out_queue) { |
099dc4fb DS |
99 | unsigned char *buf; |
100 | static unsigned char header[] = { | |
101 | PPP_ALLSTATIONS, /* 0xff */ | |
102 | PPP_UI, /* 0x03 */ | |
103 | }; | |
104 | int ret; | |
105 | ||
106 | network->outgoing_packets_queued++; | |
63c4dbd1 | 107 | spin_unlock_irqrestore(&network->lock, flags); |
099dc4fb DS |
108 | |
109 | /* | |
110 | * If we have the requested amount of headroom in the skb we | |
111 | * were handed, then we can add the header efficiently. | |
112 | */ | |
113 | if (skb_headroom(skb) >= 2) { | |
114 | memcpy(skb_push(skb, 2), header, 2); | |
115 | ret = ipwireless_send_packet(network->hardware, | |
116 | IPW_CHANNEL_RAS, skb->data, | |
117 | skb->len, | |
118 | notify_packet_sent, | |
119 | network); | |
120 | if (ret == -1) { | |
121 | skb_pull(skb, 2); | |
122 | return 0; | |
123 | } | |
124 | } else { | |
125 | /* Otherwise (rarely) we do it inefficiently. */ | |
126 | buf = kmalloc(skb->len + 2, GFP_ATOMIC); | |
127 | if (!buf) | |
128 | return 0; | |
129 | memcpy(buf + 2, skb->data, skb->len); | |
130 | memcpy(buf, header, 2); | |
131 | ret = ipwireless_send_packet(network->hardware, | |
132 | IPW_CHANNEL_RAS, buf, | |
133 | skb->len + 2, | |
134 | notify_packet_sent, | |
135 | network); | |
136 | kfree(buf); | |
137 | if (ret == -1) | |
138 | return 0; | |
139 | } | |
140 | kfree_skb(skb); | |
141 | return 1; | |
142 | } else { | |
143 | /* | |
144 | * Otherwise reject the packet, and flag that the ppp system | |
145 | * needs to be unblocked once we are ready to send. | |
146 | */ | |
147 | network->ppp_blocked = 1; | |
63c4dbd1 | 148 | spin_unlock_irqrestore(&network->lock, flags); |
bee9c7c0 DS |
149 | if (ipwireless_debug) |
150 | printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": ppp blocked\n"); | |
099dc4fb DS |
151 | return 0; |
152 | } | |
153 | } | |
154 | ||
155 | /* Handle an ioctl call that has come in via ppp. (copy of ppp_async_ioctl() */ | |
156 | static int ipwireless_ppp_ioctl(struct ppp_channel *ppp_channel, | |
157 | unsigned int cmd, unsigned long arg) | |
158 | { | |
159 | struct ipw_network *network = ppp_channel->private; | |
160 | int err, val; | |
161 | u32 accm[8]; | |
162 | int __user *user_arg = (int __user *) arg; | |
163 | ||
164 | err = -EFAULT; | |
165 | switch (cmd) { | |
166 | case PPPIOCGFLAGS: | |
167 | val = network->flags | network->rbits; | |
168 | if (put_user(val, user_arg)) | |
169 | break; | |
170 | err = 0; | |
171 | break; | |
172 | ||
173 | case PPPIOCSFLAGS: | |
174 | if (get_user(val, user_arg)) | |
175 | break; | |
176 | network->flags = val & ~SC_RCV_BITS; | |
177 | network->rbits = val & SC_RCV_BITS; | |
178 | err = 0; | |
179 | break; | |
180 | ||
181 | case PPPIOCGASYNCMAP: | |
182 | if (put_user(network->xaccm[0], user_arg)) | |
183 | break; | |
184 | err = 0; | |
185 | break; | |
186 | ||
187 | case PPPIOCSASYNCMAP: | |
188 | if (get_user(network->xaccm[0], user_arg)) | |
189 | break; | |
190 | err = 0; | |
191 | break; | |
192 | ||
193 | case PPPIOCGRASYNCMAP: | |
194 | if (put_user(network->raccm, user_arg)) | |
195 | break; | |
196 | err = 0; | |
197 | break; | |
198 | ||
199 | case PPPIOCSRASYNCMAP: | |
200 | if (get_user(network->raccm, user_arg)) | |
201 | break; | |
202 | err = 0; | |
203 | break; | |
204 | ||
205 | case PPPIOCGXASYNCMAP: | |
206 | if (copy_to_user((void __user *) arg, network->xaccm, | |
207 | sizeof(network->xaccm))) | |
208 | break; | |
209 | err = 0; | |
210 | break; | |
211 | ||
212 | case PPPIOCSXASYNCMAP: | |
213 | if (copy_from_user(accm, (void __user *) arg, sizeof(accm))) | |
214 | break; | |
215 | accm[2] &= ~0x40000000U; /* can't escape 0x5e */ | |
216 | accm[3] |= 0x60000000U; /* must escape 0x7d, 0x7e */ | |
217 | memcpy(network->xaccm, accm, sizeof(network->xaccm)); | |
218 | err = 0; | |
219 | break; | |
220 | ||
221 | case PPPIOCGMRU: | |
222 | if (put_user(network->mru, user_arg)) | |
223 | break; | |
224 | err = 0; | |
225 | break; | |
226 | ||
227 | case PPPIOCSMRU: | |
228 | if (get_user(val, user_arg)) | |
229 | break; | |
230 | if (val < PPP_MRU) | |
231 | val = PPP_MRU; | |
232 | network->mru = val; | |
233 | err = 0; | |
234 | break; | |
235 | ||
236 | default: | |
237 | err = -ENOTTY; | |
238 | } | |
239 | ||
240 | return err; | |
241 | } | |
242 | ||
d7100da0 | 243 | static const struct ppp_channel_ops ipwireless_ppp_channel_ops = { |
099dc4fb DS |
244 | .start_xmit = ipwireless_ppp_start_xmit, |
245 | .ioctl = ipwireless_ppp_ioctl | |
246 | }; | |
247 | ||
248 | static void do_go_online(struct work_struct *work_go_online) | |
249 | { | |
250 | struct ipw_network *network = | |
251 | container_of(work_go_online, struct ipw_network, | |
252 | work_go_online); | |
253 | unsigned long flags; | |
254 | ||
63c4dbd1 | 255 | spin_lock_irqsave(&network->lock, flags); |
099dc4fb DS |
256 | if (!network->ppp_channel) { |
257 | struct ppp_channel *channel; | |
258 | ||
63c4dbd1 | 259 | spin_unlock_irqrestore(&network->lock, flags); |
099dc4fb DS |
260 | channel = kzalloc(sizeof(struct ppp_channel), GFP_KERNEL); |
261 | if (!channel) { | |
262 | printk(KERN_ERR IPWIRELESS_PCCARD_NAME | |
263 | ": unable to allocate PPP channel\n"); | |
264 | return; | |
265 | } | |
266 | channel->private = network; | |
267 | channel->mtu = 16384; /* Wild guess */ | |
268 | channel->hdrlen = 2; | |
269 | channel->ops = &ipwireless_ppp_channel_ops; | |
270 | ||
271 | network->flags = 0; | |
272 | network->rbits = 0; | |
273 | network->mru = PPP_MRU; | |
274 | memset(network->xaccm, 0, sizeof(network->xaccm)); | |
275 | network->xaccm[0] = ~0U; | |
276 | network->xaccm[3] = 0x60000000U; | |
277 | network->raccm = ~0U; | |
b6abc904 AC |
278 | if (ppp_register_channel(channel) < 0) { |
279 | printk(KERN_ERR IPWIRELESS_PCCARD_NAME | |
280 | ": unable to register PPP channel\n"); | |
281 | kfree(channel); | |
282 | return; | |
283 | } | |
63c4dbd1 | 284 | spin_lock_irqsave(&network->lock, flags); |
099dc4fb DS |
285 | network->ppp_channel = channel; |
286 | } | |
63c4dbd1 | 287 | spin_unlock_irqrestore(&network->lock, flags); |
099dc4fb DS |
288 | } |
289 | ||
290 | static void do_go_offline(struct work_struct *work_go_offline) | |
291 | { | |
292 | struct ipw_network *network = | |
293 | container_of(work_go_offline, struct ipw_network, | |
294 | work_go_offline); | |
295 | unsigned long flags; | |
296 | ||
297 | mutex_lock(&network->close_lock); | |
63c4dbd1 | 298 | spin_lock_irqsave(&network->lock, flags); |
099dc4fb DS |
299 | if (network->ppp_channel != NULL) { |
300 | struct ppp_channel *channel = network->ppp_channel; | |
301 | ||
302 | network->ppp_channel = NULL; | |
63c4dbd1 | 303 | spin_unlock_irqrestore(&network->lock, flags); |
099dc4fb DS |
304 | mutex_unlock(&network->close_lock); |
305 | ppp_unregister_channel(channel); | |
306 | } else { | |
63c4dbd1 | 307 | spin_unlock_irqrestore(&network->lock, flags); |
099dc4fb DS |
308 | mutex_unlock(&network->close_lock); |
309 | } | |
310 | } | |
311 | ||
312 | void ipwireless_network_notify_control_line_change(struct ipw_network *network, | |
313 | unsigned int channel_idx, | |
314 | unsigned int control_lines, | |
315 | unsigned int changed_mask) | |
316 | { | |
317 | int i; | |
318 | ||
319 | if (channel_idx == IPW_CHANNEL_RAS) | |
320 | network->ras_control_lines = control_lines; | |
321 | ||
322 | for (i = 0; i < MAX_ASSOCIATED_TTYS; i++) { | |
323 | struct ipw_tty *tty = | |
324 | network->associated_ttys[channel_idx][i]; | |
325 | ||
326 | /* | |
327 | * If it's associated with a tty (other than the RAS channel | |
328 | * when we're online), then send the data to that tty. The RAS | |
329 | * channel's data is handled above - it always goes through | |
330 | * ppp_generic. | |
331 | */ | |
332 | if (tty) | |
333 | ipwireless_tty_notify_control_line_change(tty, | |
334 | channel_idx, | |
335 | control_lines, | |
336 | changed_mask); | |
337 | } | |
338 | } | |
339 | ||
340 | /* | |
341 | * Some versions of firmware stuff packets with 0xff 0x03 (PPP: ALLSTATIONS, UI) | |
342 | * bytes, which are required on sent packet, but not always present on received | |
343 | * packets | |
344 | */ | |
345 | static struct sk_buff *ipw_packet_received_skb(unsigned char *data, | |
346 | unsigned int length) | |
347 | { | |
348 | struct sk_buff *skb; | |
349 | ||
350 | if (length > 2 && data[0] == PPP_ALLSTATIONS && data[1] == PPP_UI) { | |
351 | length -= 2; | |
352 | data += 2; | |
353 | } | |
354 | ||
355 | skb = dev_alloc_skb(length + 4); | |
d1519e23 AC |
356 | if (skb == NULL) |
357 | return NULL; | |
099dc4fb | 358 | skb_reserve(skb, 2); |
59ae1d12 | 359 | skb_put_data(skb, data, length); |
099dc4fb DS |
360 | |
361 | return skb; | |
362 | } | |
363 | ||
364 | void ipwireless_network_packet_received(struct ipw_network *network, | |
365 | unsigned int channel_idx, | |
366 | unsigned char *data, | |
367 | unsigned int length) | |
368 | { | |
369 | int i; | |
370 | unsigned long flags; | |
371 | ||
372 | for (i = 0; i < MAX_ASSOCIATED_TTYS; i++) { | |
373 | struct ipw_tty *tty = network->associated_ttys[channel_idx][i]; | |
374 | ||
a51f4124 DS |
375 | if (!tty) |
376 | continue; | |
377 | ||
099dc4fb DS |
378 | /* |
379 | * If it's associated with a tty (other than the RAS channel | |
380 | * when we're online), then send the data to that tty. The RAS | |
381 | * channel's data is handled above - it always goes through | |
382 | * ppp_generic. | |
383 | */ | |
a51f4124 | 384 | if (channel_idx == IPW_CHANNEL_RAS |
099dc4fb DS |
385 | && (network->ras_control_lines & |
386 | IPW_CONTROL_LINE_DCD) != 0 | |
387 | && ipwireless_tty_is_modem(tty)) { | |
388 | /* | |
389 | * If data came in on the RAS channel and this tty is | |
390 | * the modem tty, and we are online, then we send it to | |
391 | * the PPP layer. | |
392 | */ | |
393 | mutex_lock(&network->close_lock); | |
63c4dbd1 | 394 | spin_lock_irqsave(&network->lock, flags); |
099dc4fb DS |
395 | if (network->ppp_channel != NULL) { |
396 | struct sk_buff *skb; | |
397 | ||
63c4dbd1 | 398 | spin_unlock_irqrestore(&network->lock, |
099dc4fb DS |
399 | flags); |
400 | ||
401 | /* Send the data to the ppp_generic module. */ | |
402 | skb = ipw_packet_received_skb(data, length); | |
d1519e23 AC |
403 | if (skb) |
404 | ppp_input(network->ppp_channel, skb); | |
099dc4fb | 405 | } else |
63c4dbd1 | 406 | spin_unlock_irqrestore(&network->lock, |
099dc4fb DS |
407 | flags); |
408 | mutex_unlock(&network->close_lock); | |
409 | } | |
410 | /* Otherwise we send it out the tty. */ | |
411 | else | |
412 | ipwireless_tty_received(tty, data, length); | |
413 | } | |
414 | } | |
415 | ||
416 | struct ipw_network *ipwireless_network_create(struct ipw_hardware *hw) | |
417 | { | |
418 | struct ipw_network *network = | |
419 | kzalloc(sizeof(struct ipw_network), GFP_ATOMIC); | |
420 | ||
421 | if (!network) | |
422 | return NULL; | |
423 | ||
63c4dbd1 | 424 | spin_lock_init(&network->lock); |
099dc4fb DS |
425 | mutex_init(&network->close_lock); |
426 | ||
427 | network->hardware = hw; | |
428 | ||
429 | INIT_WORK(&network->work_go_online, do_go_online); | |
430 | INIT_WORK(&network->work_go_offline, do_go_offline); | |
431 | ||
432 | ipwireless_associate_network(hw, network); | |
433 | ||
434 | return network; | |
435 | } | |
436 | ||
437 | void ipwireless_network_free(struct ipw_network *network) | |
438 | { | |
439 | network->shutting_down = 1; | |
440 | ||
441 | ipwireless_ppp_close(network); | |
43829731 TH |
442 | flush_work(&network->work_go_online); |
443 | flush_work(&network->work_go_offline); | |
099dc4fb DS |
444 | |
445 | ipwireless_stop_interrupts(network->hardware); | |
446 | ipwireless_associate_network(network->hardware, NULL); | |
447 | ||
448 | kfree(network); | |
449 | } | |
450 | ||
451 | void ipwireless_associate_network_tty(struct ipw_network *network, | |
452 | unsigned int channel_idx, | |
453 | struct ipw_tty *tty) | |
454 | { | |
455 | int i; | |
456 | ||
457 | for (i = 0; i < MAX_ASSOCIATED_TTYS; i++) | |
458 | if (network->associated_ttys[channel_idx][i] == NULL) { | |
459 | network->associated_ttys[channel_idx][i] = tty; | |
460 | break; | |
461 | } | |
462 | } | |
463 | ||
464 | void ipwireless_disassociate_network_ttys(struct ipw_network *network, | |
465 | unsigned int channel_idx) | |
466 | { | |
467 | int i; | |
468 | ||
469 | for (i = 0; i < MAX_ASSOCIATED_TTYS; i++) | |
470 | network->associated_ttys[channel_idx][i] = NULL; | |
471 | } | |
472 | ||
473 | void ipwireless_ppp_open(struct ipw_network *network) | |
474 | { | |
475 | if (ipwireless_debug) | |
476 | printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": online\n"); | |
477 | schedule_work(&network->work_go_online); | |
478 | } | |
479 | ||
480 | void ipwireless_ppp_close(struct ipw_network *network) | |
481 | { | |
482 | /* Disconnect from the wireless network. */ | |
483 | if (ipwireless_debug) | |
484 | printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": offline\n"); | |
485 | schedule_work(&network->work_go_offline); | |
486 | } | |
487 | ||
488 | int ipwireless_ppp_channel_index(struct ipw_network *network) | |
489 | { | |
490 | int ret = -1; | |
491 | unsigned long flags; | |
492 | ||
63c4dbd1 | 493 | spin_lock_irqsave(&network->lock, flags); |
099dc4fb DS |
494 | if (network->ppp_channel != NULL) |
495 | ret = ppp_channel_index(network->ppp_channel); | |
63c4dbd1 | 496 | spin_unlock_irqrestore(&network->lock, flags); |
099dc4fb DS |
497 | |
498 | return ret; | |
499 | } | |
500 | ||
501 | int ipwireless_ppp_unit_number(struct ipw_network *network) | |
502 | { | |
503 | int ret = -1; | |
504 | unsigned long flags; | |
505 | ||
63c4dbd1 | 506 | spin_lock_irqsave(&network->lock, flags); |
099dc4fb DS |
507 | if (network->ppp_channel != NULL) |
508 | ret = ppp_unit_number(network->ppp_channel); | |
63c4dbd1 | 509 | spin_unlock_irqrestore(&network->lock, flags); |
099dc4fb DS |
510 | |
511 | return ret; | |
512 | } | |
a0138692 DS |
513 | |
514 | int ipwireless_ppp_mru(const struct ipw_network *network) | |
515 | { | |
516 | return network->mru; | |
517 | } |