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Viewing changes to drivers/tty/ipwireless/network.c

  • Committer: Bazaar Package Importer
  • Author(s): Ben Hutchings, Ben Hutchings, Aurelien Jarno
  • Date: 2011-06-07 12:14:05 UTC
  • mfrom: (43.1.9 sid)
  • Revision ID: james.westby@ubuntu.com-20110607121405-i3h1rd7nrnd2b73h
Tags: 2.6.39-2
http://bugs.debian.org/627492
http://bugs.debian.org/596626
http://bugs.debian.org/628932
http://bugs.debian.org/628191
http://bugs.debian.org/627837
http://bugs.debian.org/622997
http://bugs.debian.org/622745
http://bugs.debian.org/619827
http://bugs.debian.org/629401
[ Ben Hutchings ]
* [x86] Enable BACKLIGHT_APPLE, replacing BACKLIGHT_MBP_NVIDIA
  (Closes: #627492)
* cgroups: Disable memory resource controller by default. Allow it
  to be enabled using kernel parameter 'cgroup_enable=memory'.
* rt2800usb: Enable support for more USB devices including
  Linksys WUSB600N (Closes: #596626) (this change was accidentally
  omitted from 2.6.39-1)
* [x86] Remove Celeron from list of processors supporting PAE. Most
  'Celeron M' models do not.
* Update debconf template translations:
  - Swedish (Martin Bagge) (Closes: #628932)
  - French (David Prévot) (Closes: #628191)
* aufs: Update for 2.6.39 (Closes: #627837)
* Add stable 2.6.39.1, including:
  - ext4: dont set PageUptodate in ext4_end_bio()
  - pata_cmd64x: fix boot crash on parisc (Closes: #622997, #622745)
  - ext3: Fix fs corruption when make_indexed_dir() fails
  - netfilter: nf_ct_sip: validate Content-Length in TCP SIP messages
  - sctp: fix race between sctp_bind_addr_free() and
    sctp_bind_addr_conflict()
  - sctp: fix memory leak of the ASCONF queue when free asoc
  - md/bitmap: fix saving of events_cleared and other state
  - cdc_acm: Fix oops when Droids MuIn LCD is connected
  - cx88: Fix conversion from BKL to fine-grained locks (Closes: #619827)
  - keys: Set cred->user_ns in key_replace_session_keyring (CVE-2011-2184)
  - tmpfs: fix race between truncate and writepage
  - nfs41: Correct offset for LAYOUTCOMMIT
  - xen/mmu: fix a race window causing leave_mm BUG()
  - ext4: fix possible use-after-free in ext4_remove_li_request()
  For the complete list of changes, see:
   http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39.1
* Bump ABI to 2
* netfilter: Enable IP_SET, IP_SET_BITMAP_IP, IP_SET_BITMAP_IPMAC,
  IP_SET_BITMAP_PORT, IP_SET_HASH_IP, IP_SET_HASH_IPPORT,
  IP_SET_HASH_IPPORTIP, IP_SET_HASH_IPPORTNET, IP_SET_HASH_NET,
  IP_SET_HASH_NETPORT, IP_SET_LIST_SET, NETFILTER_XT_SET as modules
  (Closes: #629401)

[ Aurelien Jarno ]
* [mipsel/loongson-2f] Disable_SCSI_LPFC to workaround GCC ICE.

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