resources.c 9.88 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4 5 6 7 8 9
/* net/atm/resources.c - Statically allocated resources */

/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */

/* Fixes
 * Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 * 2002/01 - don't free the whole struct sock on sk->destruct time,
 * 	     use the default destruct function initialized by sock_init_data */

10
#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
Linus Torvalds's avatar
Linus Torvalds committed
11 12 13 14 15 16 17 18

#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/atmdev.h>
#include <linux/sonet.h>
#include <linux/kernel.h> /* for barrier */
#include <linux/module.h>
#include <linux/bitops.h>
19
#include <linux/capability.h>
Linus Torvalds's avatar
Linus Torvalds committed
20
#include <linux/delay.h>
Ingo Molnar's avatar
Ingo Molnar committed
21
#include <linux/mutex.h>
22
#include <linux/slab.h>
Ingo Molnar's avatar
Ingo Molnar committed
23

Linus Torvalds's avatar
Linus Torvalds committed
24 25 26 27 28 29 30 31
#include <net/sock.h>	 /* for struct sock */

#include "common.h"
#include "resources.h"
#include "addr.h"


LIST_HEAD(atm_devs);
Ingo Molnar's avatar
Ingo Molnar committed
32
DEFINE_MUTEX(atm_dev_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
33 34 35 36 37

static struct atm_dev *__alloc_atm_dev(const char *type)
{
	struct atm_dev *dev;

38
	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
Linus Torvalds's avatar
Linus Torvalds committed
39 40 41 42 43 44 45
	if (!dev)
		return NULL;
	dev->type = type;
	dev->signal = ATM_PHY_SIG_UNKNOWN;
	dev->link_rate = ATM_OC3_PCR;
	spin_lock_init(&dev->lock);
	INIT_LIST_HEAD(&dev->local);
46
	INIT_LIST_HEAD(&dev->lecs);
Linus Torvalds's avatar
Linus Torvalds committed
47 48 49 50 51 52 53 54 55 56 57

	return dev;
}

static struct atm_dev *__atm_dev_lookup(int number)
{
	struct atm_dev *dev;
	struct list_head *p;

	list_for_each(p, &atm_devs) {
		dev = list_entry(p, struct atm_dev, dev_list);
58
		if (dev->number == number) {
Linus Torvalds's avatar
Linus Torvalds committed
59 60 61 62 63 64 65 66 67 68 69
			atm_dev_hold(dev);
			return dev;
		}
	}
	return NULL;
}

struct atm_dev *atm_dev_lookup(int number)
{
	struct atm_dev *dev;

Ingo Molnar's avatar
Ingo Molnar committed
70
	mutex_lock(&atm_dev_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
71
	dev = __atm_dev_lookup(number);
Ingo Molnar's avatar
Ingo Molnar committed
72
	mutex_unlock(&atm_dev_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
73 74
	return dev;
}
75
EXPORT_SYMBOL(atm_dev_lookup);
76

77 78 79
struct atm_dev *atm_dev_register(const char *type, struct device *parent,
				 const struct atmdev_ops *ops, int number,
				 unsigned long *flags)
Linus Torvalds's avatar
Linus Torvalds committed
80 81 82 83 84
{
	struct atm_dev *dev, *inuse;

	dev = __alloc_atm_dev(type);
	if (!dev) {
85
		pr_err("no space for dev %s\n", type);
Linus Torvalds's avatar
Linus Torvalds committed
86 87
		return NULL;
	}
Ingo Molnar's avatar
Ingo Molnar committed
88
	mutex_lock(&atm_dev_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
89
	if (number != -1) {
90 91
		inuse = __atm_dev_lookup(number);
		if (inuse) {
Linus Torvalds's avatar
Linus Torvalds committed
92
			atm_dev_put(inuse);
Ingo Molnar's avatar
Ingo Molnar committed
93
			mutex_unlock(&atm_dev_mutex);
94
			kfree(dev);
Linus Torvalds's avatar
Linus Torvalds committed
95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114
			return NULL;
		}
		dev->number = number;
	} else {
		dev->number = 0;
		while ((inuse = __atm_dev_lookup(dev->number))) {
			atm_dev_put(inuse);
			dev->number++;
		}
	}

	dev->ops = ops;
	if (flags)
		dev->flags = *flags;
	else
		memset(&dev->flags, 0, sizeof(dev->flags));
	memset(&dev->stats, 0, sizeof(dev->stats));
	atomic_set(&dev->refcnt, 1);

	if (atm_proc_dev_register(dev) < 0) {
115
		pr_err("atm_proc_dev_register failed for dev %s\n", type);
116 117 118
		goto out_fail;
	}

119
	if (atm_register_sysfs(dev, parent) < 0) {
120
		pr_err("atm_register_sysfs failed for dev %s\n", type);
121 122
		atm_proc_dev_deregister(dev);
		goto out_fail;
Linus Torvalds's avatar
Linus Torvalds committed
123
	}
124

125
	list_add_tail(&dev->dev_list, &atm_devs);
Linus Torvalds's avatar
Linus Torvalds committed
126

127 128
out:
	mutex_unlock(&atm_dev_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
129
	return dev;
130 131 132 133 134

out_fail:
	kfree(dev);
	dev = NULL;
	goto out;
Linus Torvalds's avatar
Linus Torvalds committed
135
}
136
EXPORT_SYMBOL(atm_dev_register);
Linus Torvalds's avatar
Linus Torvalds committed
137 138 139

void atm_dev_deregister(struct atm_dev *dev)
{
140 141 142 143
	BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags));
	set_bit(ATM_DF_REMOVED, &dev->flags);

	/*
144 145
	 * if we remove current device from atm_devs list, new device
	 * with same number can appear, such we need deregister proc,
146 147
	 * release async all vccs and remove them from vccs list too
	 */
Ingo Molnar's avatar
Ingo Molnar committed
148
	mutex_lock(&atm_dev_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
149
	list_del(&dev->dev_list);
Ingo Molnar's avatar
Ingo Molnar committed
150
	mutex_unlock(&atm_dev_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
151

152
	atm_dev_release_vccs(dev);
153
	atm_unregister_sysfs(dev);
154
	atm_proc_dev_deregister(dev);
Linus Torvalds's avatar
Linus Torvalds committed
155

156
	atm_dev_put(dev);
Linus Torvalds's avatar
Linus Torvalds committed
157
}
158
EXPORT_SYMBOL(atm_dev_deregister);
Linus Torvalds's avatar
Linus Torvalds committed
159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175

static void copy_aal_stats(struct k_atm_aal_stats *from,
    struct atm_aal_stats *to)
{
#define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
	__AAL_STAT_ITEMS
#undef __HANDLE_ITEM
}

static void subtract_aal_stats(struct k_atm_aal_stats *from,
    struct atm_aal_stats *to)
{
#define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
	__AAL_STAT_ITEMS
#undef __HANDLE_ITEM
}

176 177
static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg,
		       int zero)
Linus Torvalds's avatar
Linus Torvalds committed
178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194
{
	struct atm_dev_stats tmp;
	int error = 0;

	copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
	copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
	copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
	if (arg)
		error = copy_to_user(arg, &tmp, sizeof(tmp));
	if (zero && !error) {
		subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
		subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
		subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
	}
	return error ? -EFAULT : 0;
}

195
int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat)
Linus Torvalds's avatar
Linus Torvalds committed
196 197 198 199 200 201
{
	void __user *buf;
	int error, len, number, size = 0;
	struct atm_dev *dev;
	struct list_head *p;
	int *tmp_buf, *tmp_p;
202 203 204 205 206 207 208
	int __user *sioc_len;
	int __user *iobuf_len;

#ifndef CONFIG_COMPAT
	compat = 0; /* Just so the compiler _knows_ */
#endif

Linus Torvalds's avatar
Linus Torvalds committed
209
	switch (cmd) {
210 211
	case ATM_GETNAMES:
		if (compat) {
212
#ifdef CONFIG_COMPAT
213 214 215 216 217 218
			struct compat_atm_iobuf __user *ciobuf = arg;
			compat_uptr_t cbuf;
			iobuf_len = &ciobuf->length;
			if (get_user(cbuf, &ciobuf->buffer))
				return -EFAULT;
			buf = compat_ptr(cbuf);
219
#endif
220 221 222 223
		} else {
			struct atm_iobuf __user *iobuf = arg;
			iobuf_len = &iobuf->length;
			if (get_user(buf, &iobuf->buffer))
Linus Torvalds's avatar
Linus Torvalds committed
224
				return -EFAULT;
225 226 227 228 229 230 231
		}
		if (get_user(len, iobuf_len))
			return -EFAULT;
		mutex_lock(&atm_dev_mutex);
		list_for_each(p, &atm_devs)
			size += sizeof(int);
		if (size > len) {
Ingo Molnar's avatar
Ingo Molnar committed
232
			mutex_unlock(&atm_dev_mutex);
233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252
			return -E2BIG;
		}
		tmp_buf = kmalloc(size, GFP_ATOMIC);
		if (!tmp_buf) {
			mutex_unlock(&atm_dev_mutex);
			return -ENOMEM;
		}
		tmp_p = tmp_buf;
		list_for_each(p, &atm_devs) {
			dev = list_entry(p, struct atm_dev, dev_list);
			*tmp_p++ = dev->number;
		}
		mutex_unlock(&atm_dev_mutex);
		error = ((copy_to_user(buf, tmp_buf, size)) ||
			 put_user(size, iobuf_len))
			? -EFAULT : 0;
		kfree(tmp_buf);
		return error;
	default:
		break;
Linus Torvalds's avatar
Linus Torvalds committed
253 254
	}

255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280
	if (compat) {
#ifdef CONFIG_COMPAT
		struct compat_atmif_sioc __user *csioc = arg;
		compat_uptr_t carg;

		sioc_len = &csioc->length;
		if (get_user(carg, &csioc->arg))
			return -EFAULT;
		buf = compat_ptr(carg);

		if (get_user(len, &csioc->length))
			return -EFAULT;
		if (get_user(number, &csioc->number))
			return -EFAULT;
#endif
	} else {
		struct atmif_sioc __user *sioc = arg;

		sioc_len = &sioc->length;
		if (get_user(buf, &sioc->arg))
			return -EFAULT;
		if (get_user(len, &sioc->length))
			return -EFAULT;
		if (get_user(number, &sioc->number))
			return -EFAULT;
	}
281 282 283 284

	dev = try_then_request_module(atm_dev_lookup(number), "atm-device-%d",
				      number);
	if (!dev)
Linus Torvalds's avatar
Linus Torvalds committed
285
		return -ENODEV;
286

Linus Torvalds's avatar
Linus Torvalds committed
287
	switch (cmd) {
288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308
	case ATM_GETTYPE:
		size = strlen(dev->type) + 1;
		if (copy_to_user(buf, dev->type, size)) {
			error = -EFAULT;
			goto done;
		}
		break;
	case ATM_GETESI:
		size = ESI_LEN;
		if (copy_to_user(buf, dev->esi, size)) {
			error = -EFAULT;
			goto done;
		}
		break;
	case ATM_SETESI:
	{
		int i;

		for (i = 0; i < ESI_LEN; i++)
			if (dev->esi[i]) {
				error = -EEXIST;
Linus Torvalds's avatar
Linus Torvalds committed
309 310
				goto done;
			}
311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380
	}
	/* fall through */
	case ATM_SETESIF:
	{
		unsigned char esi[ESI_LEN];

		if (!capable(CAP_NET_ADMIN)) {
			error = -EPERM;
			goto done;
		}
		if (copy_from_user(esi, buf, ESI_LEN)) {
			error = -EFAULT;
			goto done;
		}
		memcpy(dev->esi, esi, ESI_LEN);
		error =  ESI_LEN;
		goto done;
	}
	case ATM_GETSTATZ:
		if (!capable(CAP_NET_ADMIN)) {
			error = -EPERM;
			goto done;
		}
		/* fall through */
	case ATM_GETSTAT:
		size = sizeof(struct atm_dev_stats);
		error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
		if (error)
			goto done;
		break;
	case ATM_GETCIRANGE:
		size = sizeof(struct atm_cirange);
		if (copy_to_user(buf, &dev->ci_range, size)) {
			error = -EFAULT;
			goto done;
		}
		break;
	case ATM_GETLINKRATE:
		size = sizeof(int);
		if (copy_to_user(buf, &dev->link_rate, size)) {
			error = -EFAULT;
			goto done;
		}
		break;
	case ATM_RSTADDR:
		if (!capable(CAP_NET_ADMIN)) {
			error = -EPERM;
			goto done;
		}
		atm_reset_addr(dev, ATM_ADDR_LOCAL);
		break;
	case ATM_ADDADDR:
	case ATM_DELADDR:
	case ATM_ADDLECSADDR:
	case ATM_DELLECSADDR:
	{
		struct sockaddr_atmsvc addr;

		if (!capable(CAP_NET_ADMIN)) {
			error = -EPERM;
			goto done;
		}

		if (copy_from_user(&addr, buf, sizeof(addr))) {
			error = -EFAULT;
			goto done;
		}
		if (cmd == ATM_ADDADDR || cmd == ATM_ADDLECSADDR)
			error = atm_add_addr(dev, &addr,
					     (cmd == ATM_ADDADDR ?
381
					      ATM_ADDR_LOCAL : ATM_ADDR_LECS));
382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404
		else
			error = atm_del_addr(dev, &addr,
					     (cmd == ATM_DELADDR ?
					      ATM_ADDR_LOCAL : ATM_ADDR_LECS));
		goto done;
	}
	case ATM_GETADDR:
	case ATM_GETLECSADDR:
		error = atm_get_addr(dev, buf, len,
				     (cmd == ATM_GETADDR ?
				      ATM_ADDR_LOCAL : ATM_ADDR_LECS));
		if (error < 0)
			goto done;
		size = error;
		/* may return 0, but later on size == 0 means "don't
		   write the length" */
		error = put_user(size, sioc_len) ? -EFAULT : 0;
		goto done;
	case ATM_SETLOOP:
		if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
		    __ATM_LM_XTLOC((int) (unsigned long) buf) >
		    __ATM_LM_XTRMT((int) (unsigned long) buf)) {
			error = -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
405
			goto done;
406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421
		}
		/* fall through */
	case ATM_SETCIRANGE:
	case SONET_GETSTATZ:
	case SONET_SETDIAG:
	case SONET_CLRDIAG:
	case SONET_SETFRAMING:
		if (!capable(CAP_NET_ADMIN)) {
			error = -EPERM;
			goto done;
		}
		/* fall through */
	default:
		if (compat) {
#ifdef CONFIG_COMPAT
			if (!dev->ops->compat_ioctl) {
Linus Torvalds's avatar
Linus Torvalds committed
422 423 424
				error = -EINVAL;
				goto done;
			}
425
			size = dev->ops->compat_ioctl(dev, cmd, buf);
426
#endif
427 428 429
		} else {
			if (!dev->ops->ioctl) {
				error = -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
430 431
				goto done;
			}
432 433 434
			size = dev->ops->ioctl(dev, cmd, buf);
		}
		if (size < 0) {
435
			error = (size == -ENOIOCTLCMD ? -ENOTTY : size);
436 437
			goto done;
		}
Linus Torvalds's avatar
Linus Torvalds committed
438
	}
439

Linus Torvalds's avatar
Linus Torvalds committed
440
	if (size)
441
		error = put_user(size, sioc_len) ? -EFAULT : 0;
Linus Torvalds's avatar
Linus Torvalds committed
442 443 444 445 446 447 448 449 450
	else
		error = 0;
done:
	atm_dev_put(dev);
	return error;
}

void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos)
{
451
	mutex_lock(&atm_dev_mutex);
452
	return seq_list_start_head(&atm_devs, *pos);
Linus Torvalds's avatar
Linus Torvalds committed
453 454 455 456
}

void atm_dev_seq_stop(struct seq_file *seq, void *v)
{
457
	mutex_unlock(&atm_dev_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
458
}
459

Linus Torvalds's avatar
Linus Torvalds committed
460 461
void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
462
	return seq_list_next(v, &atm_devs, pos);
Linus Torvalds's avatar
Linus Torvalds committed
463
}