summaryrefslogtreecommitdiff
path: root/net/wimax/op-msg.c
blob: f37dd3c5576d37dc41fac51f393b1d9d9914e391 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
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
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
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
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
/*
 * Linux WiMAX
 * Generic messaging interface between userspace and driver/device
 *
 *
 * Copyright (C) 2007-2008 Intel Corporation <linux-wimax@intel.com>
 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 *
 * This implements a direct communication channel between user space and
 * the driver/device, by which free form messages can be sent back and
 * forth.
 *
 * This is intended for device-specific features, vendor quirks, etc.
 *
 * See include/net/wimax.h
 *
 * GENERIC NETLINK ENCODING AND CAPACITY
 *
 * A destination "pipe name" is added to each message; it is up to the
 * drivers to assign or use those names (if using them at all).
 *
 * Messages are encoded as a binary netlink attribute using nla_put()
 * using type NLA_UNSPEC (as some versions of libnl still in
 * deployment don't yet understand NLA_BINARY).
 *
 * The maximum capacity of this transport is PAGESIZE per message (so
 * the actual payload will be bit smaller depending on the
 * netlink/generic netlink attributes and headers).
 *
 * RECEPTION OF MESSAGES
 *
 * When a message is received from user space, it is passed verbatim
 * to the driver calling wimax_dev->op_msg_from_user(). The return
 * value from this function is passed back to user space as an ack
 * over the generic netlink protocol.
 *
 * The stack doesn't do any processing or interpretation of these
 * messages.
 *
 * SENDING MESSAGES
 *
 * Messages can be sent with wimax_msg().
 *
 * If the message delivery needs to happen on a different context to
 * that of its creation, wimax_msg_alloc() can be used to get a
 * pointer to the message that can be delivered later on with
 * wimax_msg_send().
 *
 * ROADMAP
 *
 * wimax_gnl_doit_msg_from_user()    Process a message from user space
 *   wimax_dev_get_by_genl_info()
 *   wimax_dev->op_msg_from_user()   Delivery of message to the driver
 *
 * wimax_msg()                       Send a message to user space
 *   wimax_msg_alloc()
 *   wimax_msg_send()
 */
#include <linux/device.h>
#include <linux/slab.h>
#include <net/genetlink.h>
#include <linux/netdevice.h>
#include <linux/wimax.h>
#include <linux/security.h>
#include <linux/export.h>
#include "wimax-internal.h"


#define D_SUBMODULE op_msg
#include "debug-levels.h"


/**
 * wimax_msg_alloc - Create a new skb for sending a message to userspace
 *
 * @wimax_dev: WiMAX device descriptor
 * @pipe_name: "named pipe" the message will be sent to
 * @msg: pointer to the message data to send
 * @size: size of the message to send (in bytes), including the header.
 * @gfp_flags: flags for memory allocation.
 *
 * Returns: %0 if ok, negative errno code on error
 *
 * Description:
 *
 * Allocates an skb that will contain the message to send to user
 * space over the messaging pipe and initializes it, copying the
 * payload.
 *
 * Once this call is done, you can deliver it with
 * wimax_msg_send().
 *
 * IMPORTANT:
 *
 * Don't use skb_push()/skb_pull()/skb_reserve() on the skb, as
 * wimax_msg_send() depends on skb->data being placed at the
 * beginning of the user message.
 *
 * Unlike other WiMAX stack calls, this call can be used way early,
 * even before wimax_dev_add() is called, as long as the
 * wimax_dev->net_dev pointer is set to point to a proper
 * net_dev. This is so that drivers can use it early in case they need
 * to send stuff around or communicate with user space.
 */
struct sk_buff *wimax_msg_alloc(struct wimax_dev *wimax_dev,
				const char *pipe_name,
				const void *msg, size_t size,
				gfp_t gfp_flags)
{
	int result;
	struct device *dev = wimax_dev_to_dev(wimax_dev);
	size_t msg_size;
	void *genl_msg;
	struct sk_buff *skb;

	msg_size = nla_total_size(size)
		+ nla_total_size(sizeof(u32))
		+ (pipe_name ? nla_total_size(strlen(pipe_name)) : 0);
	result = -ENOMEM;
	skb = genlmsg_new(msg_size, gfp_flags);
	if (skb == NULL)
		goto error_new;
	genl_msg = genlmsg_put(skb, 0, 0, &wimax_gnl_family,
			       0, WIMAX_GNL_OP_MSG_TO_USER);
	if (genl_msg == NULL) {
		dev_err(dev, "no memory to create generic netlink message\n");
		goto error_genlmsg_put;
	}
	result = nla_put_u32(skb, WIMAX_GNL_MSG_IFIDX,
			     wimax_dev->net_dev->ifindex);
	if (result < 0) {
		dev_err(dev, "no memory to add ifindex attribute\n");
		goto error_nla_put;
	}
	if (pipe_name) {
		result = nla_put_string(skb, WIMAX_GNL_MSG_PIPE_NAME,
					pipe_name);
		if (result < 0) {
			dev_err(dev, "no memory to add pipe_name attribute\n");
			goto error_nla_put;
		}
	}
	result = nla_put(skb, WIMAX_GNL_MSG_DATA, size, msg);
	if (result < 0) {
		dev_err(dev, "no memory to add payload (msg %p size %zu) in "
			"attribute: %d\n", msg, size, result);
		goto error_nla_put;
	}
	genlmsg_end(skb, genl_msg);
	return skb;

error_nla_put:
error_genlmsg_put:
error_new:
	nlmsg_free(skb);
	return ERR_PTR(result);
}
EXPORT_SYMBOL_GPL(wimax_msg_alloc);


/**
 * wimax_msg_data_len - Return a pointer and size of a message's payload
 *
 * @msg: Pointer to a message created with wimax_msg_alloc()
 * @size: Pointer to where to store the message's size
 *
 * Returns the pointer to the message data.
 */
const void *wimax_msg_data_len(struct sk_buff *msg, size_t *size)
{
	struct nlmsghdr *nlh = (void *) msg->head;
	struct nlattr *nla;

	nla = nlmsg_find_attr(nlh, sizeof(struct genlmsghdr),
			      WIMAX_GNL_MSG_DATA);
	if (nla == NULL) {
		printk(KERN_ERR "Cannot find attribute WIMAX_GNL_MSG_DATA\n");
		return NULL;
	}
	*size = nla_len(nla);
	return nla_data(nla);
}
EXPORT_SYMBOL_GPL(wimax_msg_data_len);


/**
 * wimax_msg_data - Return a pointer to a message's payload
 *
 * @msg: Pointer to a message created with wimax_msg_alloc()
 */
const void *wimax_msg_data(struct sk_buff *msg)
{
	struct nlmsghdr *nlh = (void *) msg->head;
	struct nlattr *nla;

	nla = nlmsg_find_attr(nlh, sizeof(struct genlmsghdr),
			      WIMAX_GNL_MSG_DATA);
	if (nla == NULL) {
		printk(KERN_ERR "Cannot find attribute WIMAX_GNL_MSG_DATA\n");
		return NULL;
	}
	return nla_data(nla);
}
EXPORT_SYMBOL_GPL(wimax_msg_data);


/**
 * wimax_msg_len - Return a message's payload length
 *
 * @msg: Pointer to a message created with wimax_msg_alloc()
 */
ssize_t wimax_msg_len(struct sk_buff *msg)
{
	struct nlmsghdr *nlh = (void *) msg->head;
	struct nlattr *nla;

	nla = nlmsg_find_attr(nlh, sizeof(struct genlmsghdr),
			      WIMAX_GNL_MSG_DATA);
	if (nla == NULL) {
		printk(KERN_ERR "Cannot find attribute WIMAX_GNL_MSG_DATA\n");
		return -EINVAL;
	}
	return nla_len(nla);
}
EXPORT_SYMBOL_GPL(wimax_msg_len);


/**
 * wimax_msg_send - Send a pre-allocated message to user space
 *
 * @wimax_dev: WiMAX device descriptor
 *
 * @skb: &struct sk_buff returned by wimax_msg_alloc(). Note the
 *     ownership of @skb is transferred to this function.
 *
 * Returns: 0 if ok, < 0 errno code on error
 *
 * Description:
 *
 * Sends a free-form message that was preallocated with
 * wimax_msg_alloc() and filled up.
 *
 * Assumes that once you pass an skb to this function for sending, it
 * owns it and will release it when done (on success).
 *
 * IMPORTANT:
 *
 * Don't use skb_push()/skb_pull()/skb_reserve() on the skb, as
 * wimax_msg_send() depends on skb->data being placed at the
 * beginning of the user message.
 *
 * Unlike other WiMAX stack calls, this call can be used way early,
 * even before wimax_dev_add() is called, as long as the
 * wimax_dev->net_dev pointer is set to point to a proper
 * net_dev. This is so that drivers can use it early in case they need
 * to send stuff around or communicate with user space.
 */
int wimax_msg_send(struct wimax_dev *wimax_dev, struct sk_buff *skb)
{
	struct device *dev = wimax_dev_to_dev(wimax_dev);
	void *msg = skb->data;
	size_t size = skb->len;
	might_sleep();

	d_printf(1, dev, "CTX: wimax msg, %zu bytes\n", size);
	d_dump(2, dev, msg, size);
	genlmsg_multicast(&wimax_gnl_family, skb, 0,
			  wimax_gnl_mcg.id, GFP_KERNEL);
	d_printf(1, dev, "CTX: genl multicast done\n");
	return 0;
}
EXPORT_SYMBOL_GPL(wimax_msg_send);


/**
 * wimax_msg - Send a message to user space
 *
 * @wimax_dev: WiMAX device descriptor (properly referenced)
 * @pipe_name: "named pipe" the message will be sent to
 * @buf: pointer to the message to send.
 * @size: size of the buffer pointed to by @buf (in bytes).
 * @gfp_flags: flags for memory allocation.
 *
 * Returns: %0 if ok, negative errno code on error.
 *
 * Description:
 *
 * Sends a free-form message to user space on the device @wimax_dev.
 *
 * NOTES:
 *
 * Once the @skb is given to this function, who will own it and will
 * release it when done (unless it returns error).
 */
int wimax_msg(struct wimax_dev *wimax_dev, const char *pipe_name,
	      const void *buf, size_t size, gfp_t gfp_flags)
{
	int result = -ENOMEM;
	struct sk_buff *skb;

	skb = wimax_msg_alloc(wimax_dev, pipe_name, buf, size, gfp_flags);
	if (IS_ERR(skb))
		result = PTR_ERR(skb);
	else
		result = wimax_msg_send(wimax_dev, skb);
	return result;
}
EXPORT_SYMBOL_GPL(wimax_msg);

/*
 * Relays a message from user space to the driver
 *
 * The skb is passed to the driver-specific function with the netlink
 * and generic netlink headers already stripped.
 *
 * This call will block while handling/relaying the message.
 */
int wimax_gnl_doit_msg_from_user(struct sk_buff *skb, struct genl_info *info)
{
	int result, ifindex;
	struct wimax_dev *wimax_dev;
	struct device *dev;
	struct nlmsghdr *nlh = info->nlhdr;
	char *pipe_name;
	void *msg_buf;
	size_t msg_len;

	might_sleep();
	d_fnstart(3, NULL, "(skb %p info %p)\n", skb, info);
	result = -ENODEV;
	if (info->attrs[WIMAX_GNL_MSG_IFIDX] == NULL) {
		printk(KERN_ERR "WIMAX_GNL_MSG_FROM_USER: can't find IFIDX "
		       "attribute\n");
		goto error_no_wimax_dev;
	}
	ifindex = nla_get_u32(info->attrs[WIMAX_GNL_MSG_IFIDX]);
	wimax_dev = wimax_dev_get_by_genl_info(info, ifindex);
	if (wimax_dev == NULL)
		goto error_no_wimax_dev;
	dev = wimax_dev_to_dev(wimax_dev);

	/* Unpack arguments */
	result = -EINVAL;
	if (info->attrs[WIMAX_GNL_MSG_DATA] == NULL) {
		dev_err(dev, "WIMAX_GNL_MSG_FROM_USER: can't find MSG_DATA "
			"attribute\n");
		goto error_no_data;
	}
	msg_buf = nla_data(info->attrs[WIMAX_GNL_MSG_DATA]);
	msg_len = nla_len(info->attrs[WIMAX_GNL_MSG_DATA]);

	if (info->attrs[WIMAX_GNL_MSG_PIPE_NAME] == NULL)
		pipe_name = NULL;
	else {
		struct nlattr *attr = info->attrs[WIMAX_GNL_MSG_PIPE_NAME];
		size_t attr_len = nla_len(attr);
		/* libnl-1.1 does not yet support NLA_NUL_STRING */
		result = -ENOMEM;
		pipe_name = kstrndup(nla_data(attr), attr_len + 1, GFP_KERNEL);
		if (pipe_name == NULL)
			goto error_alloc;
		pipe_name[attr_len] = 0;
	}
	mutex_lock(&wimax_dev->mutex);
	result = wimax_dev_is_ready(wimax_dev);
	if (result == -ENOMEDIUM)
		result = 0;
	if (result < 0)
		goto error_not_ready;
	result = -ENOSYS;
	if (wimax_dev->op_msg_from_user == NULL)
		goto error_noop;

	d_printf(1, dev,
		 "CRX: nlmsghdr len %u type %u flags 0x%04x seq 0x%x pid %u\n",
		 nlh->nlmsg_len, nlh->nlmsg_type, nlh->nlmsg_flags,
		 nlh->nlmsg_seq, nlh->nlmsg_pid);
	d_printf(1, dev, "CRX: wimax message %zu bytes\n", msg_len);
	d_dump(2, dev, msg_buf, msg_len);

	result = wimax_dev->op_msg_from_user(wimax_dev, pipe_name,
					     msg_buf, msg_len, info);
error_noop:
error_not_ready:
	mutex_unlock(&wimax_dev->mutex);
error_alloc:
	kfree(pipe_name);
error_no_data:
	dev_put(wimax_dev->net_dev);
error_no_wimax_dev:
	d_fnend(3, NULL, "(skb %p info %p) = %d\n", skb, info, result);
	return result;
}