addr.c 9.56 KB
Newer Older
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
/*
 * 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.
 *
 * This Software is licensed under one of the following licenses:
 *
 * 1) under the terms of the "Common Public License 1.0" a copy of which is
 *    available from the Open Source Initiative, see
 *    http://www.opensource.org/licenses/cpl.php.
 *
 * 2) under the terms of the "The BSD License" a copy of which is
 *    available from the Open Source Initiative, see
 *    http://www.opensource.org/licenses/bsd-license.php.
 *
 * 3) under the terms of the "GNU General Public License (GPL) Version 2" a
 *    copy of which is available from the Open Source Initiative, see
 *    http://www.opensource.org/licenses/gpl-license.php.
 *
 * Licensee has the right to choose one of the above licenses.
 *
 * Redistributions of source code must retain the above copyright
 * notice and one of the license notices.
 *
 * Redistributions in binary form must reproduce both the above copyright
 * notice, one of the license notices in the documentation
 * and/or other materials provided with the distribution.
 */

#include <linux/mutex.h>
#include <linux/inetdevice.h>
#include <linux/workqueue.h>
#include <linux/if_arp.h>
#include <net/arp.h>
#include <net/neighbour.h>
#include <net/route.h>
38
#include <net/netevent.h>
39
40
41
42
43
44
45
46
47
48
49
#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;
	struct sockaddr src_addr;
	struct sockaddr dst_addr;
	struct rdma_dev_addr *addr;
50
	struct rdma_addr_client *client;
51
52
53
54
55
56
57
58
59
60
61
62
63
64
	void *context;
	void (*callback)(int status, struct sockaddr *src_addr,
			 struct rdma_dev_addr *addr, void *context);
	unsigned long timeout;
	int status;
};

static void process_req(void *data);

static DEFINE_MUTEX(lock);
static LIST_HEAD(req_list);
static DECLARE_WORK(work, process_req, NULL);
static struct workqueue_struct *addr_wq;

65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
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
85
86
int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
		     const unsigned char *dst_dev_addr)
87
88
89
{
	switch (dev->type) {
	case ARPHRD_INFINIBAND:
Tom Tucker's avatar
Tom Tucker committed
90
91
92
93
		dev_addr->dev_type = RDMA_NODE_IB_CA;
		break;
	case ARPHRD_ETHER:
		dev_addr->dev_type = RDMA_NODE_RNIC;
94
95
96
97
98
99
100
101
102
103
104
		break;
	default:
		return -EADDRNOTAVAIL;
	}

	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);
	return 0;
}
Tom Tucker's avatar
Tom Tucker committed
105
EXPORT_SYMBOL(rdma_copy_addr);
106
107
108
109

int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
{
	struct net_device *dev;
Al Viro's avatar
Al Viro committed
110
	__be32 ip = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
111
112
113
114
115
116
	int ret;

	dev = ip_dev_find(ip);
	if (!dev)
		return -EADDRNOTAVAIL;

Tom Tucker's avatar
Tom Tucker committed
117
	ret = rdma_copy_addr(dev_addr, dev, NULL);
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
	dev_put(dev);
	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) {
142
		if (time_after_eq(req->timeout, temp_req->timeout))
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
			break;
	}

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

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

static void addr_send_arp(struct sockaddr_in *dst_in)
{
	struct rtable *rt;
	struct flowi fl;
	u32 dst_ip = dst_in->sin_addr.s_addr;

	memset(&fl, 0, sizeof fl);
	fl.nl_u.ip4_u.daddr = dst_ip;
	if (ip_route_output_key(&rt, &fl))
		return;

	arp_send(ARPOP_REQUEST, ETH_P_ARP, rt->rt_gateway, rt->idev->dev,
		 rt->rt_src, NULL, rt->idev->dev->dev_addr, NULL);
	ip_rt_put(rt);
}

static int addr_resolve_remote(struct sockaddr_in *src_in,
			       struct sockaddr_in *dst_in,
			       struct rdma_dev_addr *addr)
{
	u32 src_ip = src_in->sin_addr.s_addr;
	u32 dst_ip = dst_in->sin_addr.s_addr;
	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;
	ret = ip_route_output_key(&rt, &fl);
	if (ret)
		goto out;

	/* If the device does ARP internally, return 'done' */
	if (rt->idev->dev->flags & IFF_NOARP) {
Tom Tucker's avatar
Tom Tucker committed
189
		rdma_copy_addr(addr, rt->idev->dev, NULL);
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
		goto put;
	}

	neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->idev->dev);
	if (!neigh) {
		ret = -ENODATA;
		goto put;
	}

	if (!(neigh->nud_state & NUD_VALID)) {
		ret = -ENODATA;
		goto release;
	}

	if (!src_ip) {
		src_in->sin_family = dst_in->sin_family;
		src_in->sin_addr.s_addr = rt->rt_src;
	}

Tom Tucker's avatar
Tom Tucker committed
209
	ret = rdma_copy_addr(addr, neigh->dev, neigh->ha);
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
release:
	neigh_release(neigh);
put:
	ip_rt_put(rt);
out:
	return ret;
}

static void process_req(void *data)
{
	struct addr_req *req, *temp_req;
	struct sockaddr_in *src_in, *dst_in;
	struct list_head done_list;

	INIT_LIST_HEAD(&done_list);

	mutex_lock(&lock);
	list_for_each_entry_safe(req, temp_req, &req_list, list) {
228
		if (req->status == -ENODATA) {
229
230
231
232
			src_in = (struct sockaddr_in *) &req->src_addr;
			dst_in = (struct sockaddr_in *) &req->dst_addr;
			req->status = addr_resolve_remote(src_in, dst_in,
							  req->addr);
233
234
235
236
			if (req->status && time_after_eq(jiffies, req->timeout))
				req->status = -ETIMEDOUT;
			else if (req->status == -ENODATA)
				continue;
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
		}
		list_del(&req->list);
		list_add_tail(&req->list, &done_list);
	}

	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);
		req->callback(req->status, &req->src_addr, req->addr,
			      req->context);
252
		put_client(req->client);
253
254
255
256
257
258
259
260
261
262
		kfree(req);
	}
}

static int addr_resolve_local(struct sockaddr_in *src_in,
			      struct sockaddr_in *dst_in,
			      struct rdma_dev_addr *addr)
{
	struct net_device *dev;
	u32 src_ip = src_in->sin_addr.s_addr;
Al Viro's avatar
Al Viro committed
263
	__be32 dst_ip = dst_in->sin_addr.s_addr;
264
265
266
267
268
269
270
271
272
	int ret;

	dev = ip_dev_find(dst_ip);
	if (!dev)
		return -EADDRNOTAVAIL;

	if (ZERONET(src_ip)) {
		src_in->sin_family = dst_in->sin_family;
		src_in->sin_addr.s_addr = dst_ip;
Tom Tucker's avatar
Tom Tucker committed
273
		ret = rdma_copy_addr(addr, dev, dev->dev_addr);
274
275
276
277
278
279
280
281
282
283
284
285
286
287
	} else if (LOOPBACK(src_ip)) {
		ret = rdma_translate_ip((struct sockaddr *)dst_in, addr);
		if (!ret)
			memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
	} else {
		ret = rdma_translate_ip((struct sockaddr *)src_in, addr);
		if (!ret)
			memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
	}

	dev_put(dev);
	return ret;
}

288
289
int rdma_resolve_ip(struct rdma_addr_client *client,
		    struct sockaddr *src_addr, struct sockaddr *dst_addr,
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
		    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)
{
	struct sockaddr_in *src_in, *dst_in;
	struct addr_req *req;
	int ret = 0;

	req = kmalloc(sizeof *req, GFP_KERNEL);
	if (!req)
		return -ENOMEM;
	memset(req, 0, sizeof *req);

	if (src_addr)
		memcpy(&req->src_addr, src_addr, ip_addr_size(src_addr));
	memcpy(&req->dst_addr, dst_addr, ip_addr_size(dst_addr));
	req->addr = addr;
	req->callback = callback;
	req->context = context;
310
311
	req->client = client;
	atomic_inc(&client->refcount);
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331

	src_in = (struct sockaddr_in *) &req->src_addr;
	dst_in = (struct sockaddr_in *) &req->dst_addr;

	req->status = addr_resolve_local(src_in, dst_in, addr);
	if (req->status == -EADDRNOTAVAIL)
		req->status = addr_resolve_remote(src_in, dst_in, addr);

	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);
		addr_send_arp(dst_in);
		break;
	default:
		ret = req->status;
332
		atomic_dec(&client->refcount);
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
		kfree(req);
		break;
	}
	return ret;
}
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;
			list_del(&req->list);
			list_add(&req->list, &req_list);
			set_timeout(req->timeout);
			break;
		}
	}
	mutex_unlock(&lock);
}
EXPORT_SYMBOL(rdma_addr_cancel);

Roland Dreier's avatar
Roland Dreier committed
359
static int netevent_callback(struct notifier_block *self, unsigned long event,
360
	void *ctx)
361
{
Roland Dreier's avatar
Roland Dreier committed
362
	if (event == NETEVENT_NEIGH_UPDATE) {
363
		struct neighbour *neigh = ctx;
364

365
366
367
368
369
		if (neigh->dev->type == ARPHRD_INFINIBAND &&
		    (neigh->nud_state & NUD_VALID)) {
			set_timeout(jiffies);
		}
	}
370
371
372
	return 0;
}

373
374
static struct notifier_block nb = {
	.notifier_call = netevent_callback
375
376
377
378
379
380
381
382
};

static int addr_init(void)
{
	addr_wq = create_singlethread_workqueue("ib_addr_wq");
	if (!addr_wq)
		return -ENOMEM;

383
	register_netevent_notifier(&nb);
384
385
386
387
388
	return 0;
}

static void addr_cleanup(void)
{
389
	unregister_netevent_notifier(&nb);
390
391
392
393
394
	destroy_workqueue(addr_wq);
}

module_init(addr_init);
module_exit(addr_cleanup);