addr.c 11.2 KB
Newer Older
1
2
3
4
5
6
/*
 * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
 * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
 * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
 * Copyright (c) 2005 Intel Corporation.  All rights reserved.
 *
Sean Hefty's avatar
Sean Hefty committed
7
8
9
10
11
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
12
 *
Sean Hefty's avatar
Sean Hefty committed
13
14
15
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
16
 *
Sean Hefty's avatar
Sean Hefty committed
17
18
19
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
20
 *
Sean Hefty's avatar
Sean Hefty committed
21
22
23
24
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
25
 *
Sean Hefty's avatar
Sean Hefty committed
26
27
28
29
30
31
32
33
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
34
35
36
37
38
39
40
41
 */

#include <linux/mutex.h>
#include <linux/inetdevice.h>
#include <linux/workqueue.h>
#include <net/arp.h>
#include <net/neighbour.h>
#include <net/route.h>
42
#include <net/netevent.h>
43
44
#include <net/addrconf.h>
#include <net/ip6_route.h>
45
46
47
48
49
50
51
52
#include <rdma/ib_addr.h>

MODULE_AUTHOR("Sean Hefty");
MODULE_DESCRIPTION("IB Address Translation");
MODULE_LICENSE("Dual BSD/GPL");

struct addr_req {
	struct list_head list;
53
54
	struct sockaddr_storage src_addr;
	struct sockaddr_storage dst_addr;
55
	struct rdma_dev_addr *addr;
56
	struct rdma_addr_client *client;
57
58
59
60
61
62
63
	void *context;
	void (*callback)(int status, struct sockaddr *src_addr,
			 struct rdma_dev_addr *addr, void *context);
	unsigned long timeout;
	int status;
};

David Howells's avatar
David Howells committed
64
static void process_req(struct work_struct *work);
65
66
67

static DEFINE_MUTEX(lock);
static LIST_HEAD(req_list);
David Howells's avatar
David Howells committed
68
static DECLARE_DELAYED_WORK(work, process_req);
69
70
static struct workqueue_struct *addr_wq;

71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
void rdma_addr_register_client(struct rdma_addr_client *client)
{
	atomic_set(&client->refcount, 1);
	init_completion(&client->comp);
}
EXPORT_SYMBOL(rdma_addr_register_client);

static inline void put_client(struct rdma_addr_client *client)
{
	if (atomic_dec_and_test(&client->refcount))
		complete(&client->comp);
}

void rdma_addr_unregister_client(struct rdma_addr_client *client)
{
	put_client(client);
	wait_for_completion(&client->comp);
}
EXPORT_SYMBOL(rdma_addr_unregister_client);

Tom Tucker's avatar
Tom Tucker committed
91
92
int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
		     const unsigned char *dst_dev_addr)
93
{
94
	dev_addr->dev_type = dev->type;
95
96
97
98
	memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
	memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
	if (dst_dev_addr)
		memcpy(dev_addr->dst_dev_addr, dst_dev_addr, MAX_ADDR_LEN);
99
	dev_addr->bound_dev_if = dev->ifindex;
100
101
	return 0;
}
Tom Tucker's avatar
Tom Tucker committed
102
EXPORT_SYMBOL(rdma_copy_addr);
103
104
105
106

int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
{
	struct net_device *dev;
107
	int ret = -EADDRNOTAVAIL;
108

109
110
111
112
113
114
115
116
117
	if (dev_addr->bound_dev_if) {
		dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
		if (!dev)
			return -ENODEV;
		ret = rdma_copy_addr(dev_addr, dev, NULL);
		dev_put(dev);
		return ret;
	}

118
119
120
121
122
123
124
	switch (addr->sa_family) {
	case AF_INET:
		dev = ip_dev_find(&init_net,
			((struct sockaddr_in *) addr)->sin_addr.s_addr);

		if (!dev)
			return ret;
125

126
127
128
		ret = rdma_copy_addr(dev_addr, dev, NULL);
		dev_put(dev);
		break;
129
130

#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
131
	case AF_INET6:
132
		read_lock(&dev_base_lock);
133
134
135
136
137
138
139
140
		for_each_netdev(&init_net, dev) {
			if (ipv6_chk_addr(&init_net,
					  &((struct sockaddr_in6 *) addr)->sin6_addr,
					  dev, 1)) {
				ret = rdma_copy_addr(dev_addr, dev, NULL);
				break;
			}
		}
141
		read_unlock(&dev_base_lock);
142
		break;
143
#endif
144
	}
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
	return ret;
}
EXPORT_SYMBOL(rdma_translate_ip);

static void set_timeout(unsigned long time)
{
	unsigned long delay;

	cancel_delayed_work(&work);

	delay = time - jiffies;
	if ((long)delay <= 0)
		delay = 1;

	queue_delayed_work(addr_wq, &work, delay);
}

static void queue_req(struct addr_req *req)
{
	struct addr_req *temp_req;

	mutex_lock(&lock);
	list_for_each_entry_reverse(temp_req, &req_list, list) {
168
		if (time_after_eq(req->timeout, temp_req->timeout))
169
170
171
172
173
174
175
176
177
178
			break;
	}

	list_add(&req->list, &temp_req->list);

	if (req_list.next == &req->list)
		set_timeout(req->timeout);
	mutex_unlock(&lock);
}

179
180
181
static int addr4_resolve(struct sockaddr_in *src_in,
			 struct sockaddr_in *dst_in,
			 struct rdma_dev_addr *addr)
182
{
183
184
	__be32 src_ip = src_in->sin_addr.s_addr;
	__be32 dst_ip = dst_in->sin_addr.s_addr;
185
186
187
188
189
190
191
192
	struct flowi fl;
	struct rtable *rt;
	struct neighbour *neigh;
	int ret;

	memset(&fl, 0, sizeof fl);
	fl.nl_u.ip4_u.daddr = dst_ip;
	fl.nl_u.ip4_u.saddr = src_ip;
193
194
	fl.oif = addr->bound_dev_if;

195
	ret = ip_route_output_key(&init_net, &rt, &fl);
196
197
198
	if (ret)
		goto out;

199
200
201
202
203
204
205
206
207
208
	src_in->sin_family = AF_INET;
	src_in->sin_addr.s_addr = rt->rt_src;

	if (rt->idev->dev->flags & IFF_LOOPBACK) {
		ret = rdma_translate_ip((struct sockaddr *) dst_in, addr);
		if (!ret)
			memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
		goto put;
	}

209
210
	/* If the device does ARP internally, return 'done' */
	if (rt->idev->dev->flags & IFF_NOARP) {
Tom Tucker's avatar
Tom Tucker committed
211
		rdma_copy_addr(addr, rt->idev->dev, NULL);
212
213
214
215
		goto put;
	}

	neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->idev->dev);
216
217
	if (!neigh || !(neigh->nud_state & NUD_VALID)) {
		neigh_event_send(rt->u.dst.neighbour, NULL);
218
		ret = -ENODATA;
219
220
		if (neigh)
			goto release;
221
222
223
		goto put;
	}

Tom Tucker's avatar
Tom Tucker committed
224
	ret = rdma_copy_addr(addr, neigh->dev, neigh->ha);
225
226
227
228
229
230
231
232
release:
	neigh_release(neigh);
put:
	ip_rt_put(rt);
out:
	return ret;
}

233
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
Sean Hefty's avatar
Sean Hefty committed
234
235
236
static int addr6_resolve(struct sockaddr_in6 *src_in,
			 struct sockaddr_in6 *dst_in,
			 struct rdma_dev_addr *addr)
237
238
239
240
{
	struct flowi fl;
	struct neighbour *neigh;
	struct dst_entry *dst;
Sean Hefty's avatar
Sean Hefty committed
241
	int ret;
242
243

	memset(&fl, 0, sizeof fl);
Sean Hefty's avatar
Sean Hefty committed
244
245
	ipv6_addr_copy(&fl.fl6_dst, &dst_in->sin6_addr);
	ipv6_addr_copy(&fl.fl6_src, &src_in->sin6_addr);
246
	fl.oif = addr->bound_dev_if;
247
248

	dst = ip6_route_output(&init_net, NULL, &fl);
Sean Hefty's avatar
Sean Hefty committed
249
250
251
252
253
254
255
256
	if ((ret = dst->error))
		goto put;

	if (ipv6_addr_any(&fl.fl6_src)) {
		ret = ipv6_dev_get_saddr(&init_net, ip6_dst_idev(dst)->dev,
					 &fl.fl6_dst, 0, &fl.fl6_src);
		if (ret)
			goto put;
257

Sean Hefty's avatar
Sean Hefty committed
258
259
260
261
262
263
264
265
266
267
268
269
		src_in->sin6_family = AF_INET6;
		ipv6_addr_copy(&src_in->sin6_addr, &fl.fl6_src);
	}

	if (dst->dev->flags & IFF_LOOPBACK) {
		ret = rdma_translate_ip((struct sockaddr *) dst_in, addr);
		if (!ret)
			memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
		goto put;
	}

	/* If the device does ARP internally, return 'done' */
270
271
	if (dst->dev->flags & IFF_NOARP) {
		ret = rdma_copy_addr(addr, dst->dev, NULL);
Sean Hefty's avatar
Sean Hefty committed
272
		goto put;
273
274
	}

Sean Hefty's avatar
Sean Hefty committed
275
276
277
278
279
280
281
282
283
	neigh = dst->neighbour;
	if (!neigh || !(neigh->nud_state & NUD_VALID)) {
		neigh_event_send(dst->neighbour, NULL);
		ret = -ENODATA;
		goto put;
	}

	ret = rdma_copy_addr(addr, dst->dev, neigh->ha);
put:
284
285
286
	dst_release(dst);
	return ret;
}
287
#else
Sean Hefty's avatar
Sean Hefty committed
288
289
290
static int addr6_resolve(struct sockaddr_in6 *src_in,
			 struct sockaddr_in6 *dst_in,
			 struct rdma_dev_addr *addr)
291
292
293
294
{
	return -EADDRNOTAVAIL;
}
#endif
295

296
297
298
static int addr_resolve(struct sockaddr *src_in,
			struct sockaddr *dst_in,
			struct rdma_dev_addr *addr)
299
300
{
	if (src_in->sa_family == AF_INET) {
301
		return addr4_resolve((struct sockaddr_in *) src_in,
302
303
			(struct sockaddr_in *) dst_in, addr);
	} else
Sean Hefty's avatar
Sean Hefty committed
304
		return addr6_resolve((struct sockaddr_in6 *) src_in,
305
306
307
			(struct sockaddr_in6 *) dst_in, addr);
}

David Howells's avatar
David Howells committed
308
static void process_req(struct work_struct *work)
309
310
{
	struct addr_req *req, *temp_req;
311
	struct sockaddr *src_in, *dst_in;
312
313
314
315
316
317
	struct list_head done_list;

	INIT_LIST_HEAD(&done_list);

	mutex_lock(&lock);
	list_for_each_entry_safe(req, temp_req, &req_list, list) {
318
		if (req->status == -ENODATA) {
319
320
			src_in = (struct sockaddr *) &req->src_addr;
			dst_in = (struct sockaddr *) &req->dst_addr;
321
			req->status = addr_resolve(src_in, dst_in, req->addr);
322
323
324
325
			if (req->status && time_after_eq(jiffies, req->timeout))
				req->status = -ETIMEDOUT;
			else if (req->status == -ENODATA)
				continue;
326
		}
327
		list_move_tail(&req->list, &done_list);
328
329
330
331
332
333
334
335
336
337
	}

	if (!list_empty(&req_list)) {
		req = list_entry(req_list.next, struct addr_req, list);
		set_timeout(req->timeout);
	}
	mutex_unlock(&lock);

	list_for_each_entry_safe(req, temp_req, &done_list, list) {
		list_del(&req->list);
338
339
		req->callback(req->status, (struct sockaddr *) &req->src_addr,
			req->addr, req->context);
340
		put_client(req->client);
341
342
343
344
		kfree(req);
	}
}

345
346
int rdma_resolve_ip(struct rdma_addr_client *client,
		    struct sockaddr *src_addr, struct sockaddr *dst_addr,
347
348
349
350
351
		    struct rdma_dev_addr *addr, int timeout_ms,
		    void (*callback)(int status, struct sockaddr *src_addr,
				     struct rdma_dev_addr *addr, void *context),
		    void *context)
{
352
	struct sockaddr *src_in, *dst_in;
353
354
355
	struct addr_req *req;
	int ret = 0;

356
	req = kzalloc(sizeof *req, GFP_KERNEL);
357
358
359
	if (!req)
		return -ENOMEM;

360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
	src_in = (struct sockaddr *) &req->src_addr;
	dst_in = (struct sockaddr *) &req->dst_addr;

	if (src_addr) {
		if (src_addr->sa_family != dst_addr->sa_family) {
			ret = -EINVAL;
			goto err;
		}

		memcpy(src_in, src_addr, ip_addr_size(src_addr));
	} else {
		src_in->sa_family = dst_addr->sa_family;
	}

	memcpy(dst_in, dst_addr, ip_addr_size(dst_addr));
375
376
377
	req->addr = addr;
	req->callback = callback;
	req->context = context;
378
379
	req->client = client;
	atomic_inc(&client->refcount);
380

Sean Hefty's avatar
Sean Hefty committed
381
	req->status = addr_resolve(src_in, dst_in, addr);
382
383
384
385
386
387
388
389
390
391
392
	switch (req->status) {
	case 0:
		req->timeout = jiffies;
		queue_req(req);
		break;
	case -ENODATA:
		req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
		queue_req(req);
		break;
	default:
		ret = req->status;
393
		atomic_dec(&client->refcount);
394
		goto err;
395
396
	}
	return ret;
397
398
399
err:
	kfree(req);
	return ret;
400
401
402
403
404
405
406
407
408
409
410
411
}
EXPORT_SYMBOL(rdma_resolve_ip);

void rdma_addr_cancel(struct rdma_dev_addr *addr)
{
	struct addr_req *req, *temp_req;

	mutex_lock(&lock);
	list_for_each_entry_safe(req, temp_req, &req_list, list) {
		if (req->addr == addr) {
			req->status = -ECANCELED;
			req->timeout = jiffies;
412
			list_move(&req->list, &req_list);
413
414
415
416
417
418
419
420
			set_timeout(req->timeout);
			break;
		}
	}
	mutex_unlock(&lock);
}
EXPORT_SYMBOL(rdma_addr_cancel);

Roland Dreier's avatar
Roland Dreier committed
421
static int netevent_callback(struct notifier_block *self, unsigned long event,
422
	void *ctx)
423
{
Roland Dreier's avatar
Roland Dreier committed
424
	if (event == NETEVENT_NEIGH_UPDATE) {
425
		struct neighbour *neigh = ctx;
426

427
		if (neigh->nud_state & NUD_VALID) {
428
429
430
			set_timeout(jiffies);
		}
	}
431
432
433
	return 0;
}

434
435
static struct notifier_block nb = {
	.notifier_call = netevent_callback
436
437
};

438
static int __init addr_init(void)
439
{
440
	addr_wq = create_singlethread_workqueue("ib_addr");
441
442
443
	if (!addr_wq)
		return -ENOMEM;

444
	register_netevent_notifier(&nb);
445
446
447
	return 0;
}

448
static void __exit addr_cleanup(void)
449
{
450
	unregister_netevent_notifier(&nb);
451
452
453
454
455
	destroy_workqueue(addr_wq);
}

module_init(addr_init);
module_exit(addr_cleanup);