summaryrefslogtreecommitdiff
path: root/drivers/infiniband/core/iwpm_msg.c
blob: 8861c052155ab72e0062be5e1c03d1723705f0c2 (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
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
/*
 * Copyright (c) 2014 Intel Corporation. All rights reserved.
 * Copyright (c) 2014 Chelsio, Inc. All rights reserved.
 *
 * 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:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - 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.
 *
 * 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.
 */

#include "iwpm_util.h"

static const char iwpm_ulib_name[IWPM_ULIBNAME_SIZE] = "iWarpPortMapperUser";
static int iwpm_ulib_version = 3;
static int iwpm_user_pid = IWPM_PID_UNDEFINED;
static atomic_t echo_nlmsg_seq;

int iwpm_valid_pid(void)
{
	return iwpm_user_pid > 0;
}

/*
 * iwpm_register_pid - Send a netlink query to user space
 *                     for the iwarp port mapper pid
 *
 * nlmsg attributes:
 *	[IWPM_NLA_REG_PID_SEQ]
 *	[IWPM_NLA_REG_IF_NAME]
 *	[IWPM_NLA_REG_IBDEV_NAME]
 *	[IWPM_NLA_REG_ULIB_NAME]
 */
int iwpm_register_pid(struct iwpm_dev_data *pm_msg, u8 nl_client)
{
	struct sk_buff *skb = NULL;
	struct iwpm_nlmsg_request *nlmsg_request = NULL;
	struct nlmsghdr *nlh;
	u32 msg_seq;
	const char *err_str = "";
	int ret = -EINVAL;

	if (!iwpm_valid_client(nl_client)) {
		err_str = "Invalid port mapper client";
		goto pid_query_error;
	}
	if (iwpm_check_registration(nl_client, IWPM_REG_VALID) ||
			iwpm_user_pid == IWPM_PID_UNAVAILABLE)
		return 0;
	skb = iwpm_create_nlmsg(RDMA_NL_IWPM_REG_PID, &nlh, nl_client);
	if (!skb) {
		err_str = "Unable to create a nlmsg";
		goto pid_query_error;
	}
	nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
	nlmsg_request = iwpm_get_nlmsg_request(nlh->nlmsg_seq, nl_client, GFP_KERNEL);
	if (!nlmsg_request) {
		err_str = "Unable to allocate netlink request";
		goto pid_query_error;
	}
	msg_seq = atomic_read(&echo_nlmsg_seq);

	/* fill in the pid request message */
	err_str = "Unable to put attribute of the nlmsg";
	ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq, IWPM_NLA_REG_PID_SEQ);
	if (ret)
		goto pid_query_error;
	ret = ibnl_put_attr(skb, nlh, IFNAMSIZ,
			    pm_msg->if_name, IWPM_NLA_REG_IF_NAME);
	if (ret)
		goto pid_query_error;
	ret = ibnl_put_attr(skb, nlh, IWPM_DEVNAME_SIZE,
				pm_msg->dev_name, IWPM_NLA_REG_IBDEV_NAME);
	if (ret)
		goto pid_query_error;
	ret = ibnl_put_attr(skb, nlh, IWPM_ULIBNAME_SIZE,
				(char *)iwpm_ulib_name, IWPM_NLA_REG_ULIB_NAME);
	if (ret)
		goto pid_query_error;

	nlmsg_end(skb, nlh);

	pr_debug("%s: Multicasting a nlmsg (dev = %s ifname = %s iwpm = %s)\n",
		__func__, pm_msg->dev_name, pm_msg->if_name, iwpm_ulib_name);

	ret = rdma_nl_multicast(skb, RDMA_NL_GROUP_IWPM, GFP_KERNEL);
	if (ret) {
		skb = NULL; /* skb is freed in the netlink send-op handling */
		iwpm_user_pid = IWPM_PID_UNAVAILABLE;
		err_str = "Unable to send a nlmsg";
		goto pid_query_error;
	}
	nlmsg_request->req_buffer = pm_msg;
	ret = iwpm_wait_complete_req(nlmsg_request);
	return ret;
pid_query_error:
	pr_info("%s: %s (client = %d)\n", __func__, err_str, nl_client);
	if (skb)
		dev_kfree_skb(skb);
	if (nlmsg_request)
		iwpm_free_nlmsg_request(&nlmsg_request->kref);
	return ret;
}

/*
 * iwpm_add_mapping - Send a netlink add mapping message
 *                    to the port mapper
 * nlmsg attributes:
 *	[IWPM_NLA_MANAGE_MAPPING_SEQ]
 *	[IWPM_NLA_MANAGE_ADDR]
 */
int iwpm_add_mapping(struct iwpm_sa_data *pm_msg, u8 nl_client)
{
	struct sk_buff *skb = NULL;
	struct iwpm_nlmsg_request *nlmsg_request = NULL;
	struct nlmsghdr *nlh;
	u32 msg_seq;
	const char *err_str = "";
	int ret = -EINVAL;

	if (!iwpm_valid_client(nl_client)) {
		err_str = "Invalid port mapper client";
		goto add_mapping_error;
	}
	if (!iwpm_valid_pid())
		return 0;
	if (!iwpm_check_registration(nl_client, IWPM_REG_VALID)) {
		err_str = "Unregistered port mapper client";
		goto add_mapping_error;
	}
	skb = iwpm_create_nlmsg(RDMA_NL_IWPM_ADD_MAPPING, &nlh, nl_client);
	if (!skb) {
		err_str = "Unable to create a nlmsg";
		goto add_mapping_error;
	}
	nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
	nlmsg_request = iwpm_get_nlmsg_request(nlh->nlmsg_seq, nl_client, GFP_KERNEL);
	if (!nlmsg_request) {
		err_str = "Unable to allocate netlink request";
		goto add_mapping_error;
	}
	msg_seq = atomic_read(&echo_nlmsg_seq);
	/* fill in the add mapping message */
	err_str = "Unable to put attribute of the nlmsg";
	ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq,
				IWPM_NLA_MANAGE_MAPPING_SEQ);
	if (ret)
		goto add_mapping_error;
	ret = ibnl_put_attr(skb, nlh, sizeof(struct sockaddr_storage),
				&pm_msg->loc_addr, IWPM_NLA_MANAGE_ADDR);
	if (ret)
		goto add_mapping_error;

	nlmsg_end(skb, nlh);
	nlmsg_request->req_buffer = pm_msg;

	ret = rdma_nl_unicast_wait(skb, iwpm_user_pid);
	if (ret) {
		skb = NULL; /* skb is freed in the netlink send-op handling */
		iwpm_user_pid = IWPM_PID_UNDEFINED;
		err_str = "Unable to send a nlmsg";
		goto add_mapping_error;
	}
	ret = iwpm_wait_complete_req(nlmsg_request);
	return ret;
add_mapping_error:
	pr_info("%s: %s (client = %d)\n", __func__, err_str, nl_client);
	if (skb)
		dev_kfree_skb(skb);
	if (nlmsg_request)
		iwpm_free_nlmsg_request(&nlmsg_request->kref);
	return ret;
}

/*
 * iwpm_add_and_query_mapping - Send a netlink add and query
 *                              mapping message to the port mapper
 * nlmsg attributes:
 *	[IWPM_NLA_QUERY_MAPPING_SEQ]
 *	[IWPM_NLA_QUERY_LOCAL_ADDR]
 *	[IWPM_NLA_QUERY_REMOTE_ADDR]
 */
int iwpm_add_and_query_mapping(struct iwpm_sa_data *pm_msg, u8 nl_client)
{
	struct sk_buff *skb = NULL;
	struct iwpm_nlmsg_request *nlmsg_request = NULL;
	struct nlmsghdr *nlh;
	u32 msg_seq;
	const char *err_str = "";
	int ret = -EINVAL;

	if (!iwpm_valid_client(nl_client)) {
		err_str = "Invalid port mapper client";
		goto query_mapping_error;
	}
	if (!iwpm_valid_pid())
		return 0;
	if (!iwpm_check_registration(nl_client, IWPM_REG_VALID)) {
		err_str = "Unregistered port mapper client";
		goto query_mapping_error;
	}
	ret = -ENOMEM;
	skb = iwpm_create_nlmsg(RDMA_NL_IWPM_QUERY_MAPPING, &nlh, nl_client);
	if (!skb) {
		err_str = "Unable to create a nlmsg";
		goto query_mapping_error;
	}
	nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
	nlmsg_request = iwpm_get_nlmsg_request(nlh->nlmsg_seq,
				nl_client, GFP_KERNEL);
	if (!nlmsg_request) {
		err_str = "Unable to allocate netlink request";
		goto query_mapping_error;
	}
	msg_seq = atomic_read(&echo_nlmsg_seq);

	/* fill in the query message */
	err_str = "Unable to put attribute of the nlmsg";
	ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq,
				IWPM_NLA_QUERY_MAPPING_SEQ);
	if (ret)
		goto query_mapping_error;
	ret = ibnl_put_attr(skb, nlh, sizeof(struct sockaddr_storage),
				&pm_msg->loc_addr, IWPM_NLA_QUERY_LOCAL_ADDR);
	if (ret)
		goto query_mapping_error;
	ret = ibnl_put_attr(skb, nlh, sizeof(struct sockaddr_storage),
				&pm_msg->rem_addr, IWPM_NLA_QUERY_REMOTE_ADDR);
	if (ret)
		goto query_mapping_error;

	nlmsg_end(skb, nlh);
	nlmsg_request->req_buffer = pm_msg;

	ret = rdma_nl_unicast_wait(skb, iwpm_user_pid);
	if (ret) {
		skb = NULL; /* skb is freed in the netlink send-op handling */
		err_str = "Unable to send a nlmsg";
		goto query_mapping_error;
	}
	ret = iwpm_wait_complete_req(nlmsg_request);
	return ret;
query_mapping_error:
	pr_info("%s: %s (client = %d)\n", __func__, err_str, nl_client);
	if (skb)
		dev_kfree_skb(skb);
	if (nlmsg_request)
		iwpm_free_nlmsg_request(&nlmsg_request->kref);
	return ret;
}

/*
 * iwpm_remove_mapping - Send a netlink remove mapping message
 *                       to the port mapper
 * nlmsg attributes:
 *	[IWPM_NLA_MANAGE_MAPPING_SEQ]
 *	[IWPM_NLA_MANAGE_ADDR]
 */
int iwpm_remove_mapping(struct sockaddr_storage *local_addr, u8 nl_client)
{
	struct sk_buff *skb = NULL;
	struct nlmsghdr *nlh;
	u32 msg_seq;
	const char *err_str = "";
	int ret = -EINVAL;

	if (!iwpm_valid_client(nl_client)) {
		err_str = "Invalid port mapper client";
		goto remove_mapping_error;
	}
	if (!iwpm_valid_pid())
		return 0;
	if (iwpm_check_registration(nl_client, IWPM_REG_UNDEF)) {
		err_str = "Unregistered port mapper client";
		goto remove_mapping_error;
	}
	skb = iwpm_create_nlmsg(RDMA_NL_IWPM_REMOVE_MAPPING, &nlh, nl_client);
	if (!skb) {
		ret = -ENOMEM;
		err_str = "Unable to create a nlmsg";
		goto remove_mapping_error;
	}
	msg_seq = atomic_read(&echo_nlmsg_seq);
	nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
	err_str = "Unable to put attribute of the nlmsg";
	ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq,
				IWPM_NLA_MANAGE_MAPPING_SEQ);
	if (ret)
		goto remove_mapping_error;
	ret = ibnl_put_attr(skb, nlh, sizeof(struct sockaddr_storage),
				local_addr, IWPM_NLA_MANAGE_ADDR);
	if (ret)
		goto remove_mapping_error;

	nlmsg_end(skb, nlh);

	ret = rdma_nl_unicast_wait(skb, iwpm_user_pid);
	if (ret) {
		skb = NULL; /* skb is freed in the netlink send-op handling */
		iwpm_user_pid = IWPM_PID_UNDEFINED;
		err_str = "Unable to send a nlmsg";
		goto remove_mapping_error;
	}
	iwpm_print_sockaddr(local_addr,
			"remove_mapping: Local sockaddr:");
	return 0;
remove_mapping_error:
	pr_info("%s: %s (client = %d)\n", __func__, err_str, nl_client);
	if (skb)
		dev_kfree_skb_any(skb);
	return ret;
}

/* netlink attribute policy for the received response to register pid request */
static const struct nla_policy resp_reg_policy[IWPM_NLA_RREG_PID_MAX] = {
	[IWPM_NLA_RREG_PID_SEQ]     = { .type = NLA_U32 },
	[IWPM_NLA_RREG_IBDEV_NAME]  = { .type = NLA_STRING,
					.len = IWPM_DEVNAME_SIZE - 1 },
	[IWPM_NLA_RREG_ULIB_NAME]   = { .type = NLA_STRING,
					.len = IWPM_ULIBNAME_SIZE - 1 },
	[IWPM_NLA_RREG_ULIB_VER]    = { .type = NLA_U16 },
	[IWPM_NLA_RREG_PID_ERR]     = { .type = NLA_U16 }
};

/*
 * iwpm_register_pid_cb - Process a port mapper response to
 *                        iwpm_register_pid()
 */
int iwpm_register_pid_cb(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct iwpm_nlmsg_request *nlmsg_request = NULL;
	struct nlattr *nltb[IWPM_NLA_RREG_PID_MAX];
	struct iwpm_dev_data *pm_msg;
	char *dev_name, *iwpm_name;
	u32 msg_seq;
	u8 nl_client;
	u16 iwpm_version;
	const char *msg_type = "Register Pid response";

	if (iwpm_parse_nlmsg(cb, IWPM_NLA_RREG_PID_MAX,
				resp_reg_policy, nltb, msg_type))
		return -EINVAL;

	msg_seq = nla_get_u32(nltb[IWPM_NLA_RREG_PID_SEQ]);
	nlmsg_request = iwpm_find_nlmsg_request(msg_seq);
	if (!nlmsg_request) {
		pr_info("%s: Could not find a matching request (seq = %u)\n",
				 __func__, msg_seq);
		return -EINVAL;
	}
	pm_msg = nlmsg_request->req_buffer;
	nl_client = nlmsg_request->nl_client;
	dev_name = (char *)nla_data(nltb[IWPM_NLA_RREG_IBDEV_NAME]);
	iwpm_name = (char *)nla_data(nltb[IWPM_NLA_RREG_ULIB_NAME]);
	iwpm_version = nla_get_u16(nltb[IWPM_NLA_RREG_ULIB_VER]);

	/* check device name, ulib name and version */
	if (strcmp(pm_msg->dev_name, dev_name) ||
			strcmp(iwpm_ulib_name, iwpm_name) ||
			iwpm_version != iwpm_ulib_version) {

		pr_info("%s: Incorrect info (dev = %s name = %s version = %d)\n",
				__func__, dev_name, iwpm_name, iwpm_version);
		nlmsg_request->err_code = IWPM_USER_LIB_INFO_ERR;
		goto register_pid_response_exit;
	}
	iwpm_user_pid = cb->nlh->nlmsg_pid;
	atomic_set(&echo_nlmsg_seq, cb->nlh->nlmsg_seq);
	pr_debug("%s: iWarp Port Mapper (pid = %d) is available!\n",
			__func__, iwpm_user_pid);
	if (iwpm_valid_client(nl_client))
		iwpm_set_registration(nl_client, IWPM_REG_VALID);
register_pid_response_exit:
	nlmsg_request->request_done = 1;
	/* always for found nlmsg_request */
	kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
	barrier();
	up(&nlmsg_request->sem);
	return 0;
}

/* netlink attribute policy for the received response to add mapping request */
static const struct nla_policy resp_add_policy[IWPM_NLA_RMANAGE_MAPPING_MAX] = {
	[IWPM_NLA_MANAGE_MAPPING_SEQ]     = { .type = NLA_U32 },
	[IWPM_NLA_MANAGE_ADDR]            = { .len = sizeof(struct sockaddr_storage) },
	[IWPM_NLA_MANAGE_MAPPED_LOC_ADDR] = { .len = sizeof(struct sockaddr_storage) },
	[IWPM_NLA_RMANAGE_MAPPING_ERR]	  = { .type = NLA_U16 }
};

/*
 * iwpm_add_mapping_cb - Process a port mapper response to
 *                       iwpm_add_mapping()
 */
int iwpm_add_mapping_cb(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct iwpm_sa_data *pm_msg;
	struct iwpm_nlmsg_request *nlmsg_request = NULL;
	struct nlattr *nltb[IWPM_NLA_RMANAGE_MAPPING_MAX];
	struct sockaddr_storage *local_sockaddr;
	struct sockaddr_storage *mapped_sockaddr;
	const char *msg_type;
	u32 msg_seq;

	msg_type = "Add Mapping response";
	if (iwpm_parse_nlmsg(cb, IWPM_NLA_RMANAGE_MAPPING_MAX,
				resp_add_policy, nltb, msg_type))
		return -EINVAL;

	atomic_set(&echo_nlmsg_seq, cb->nlh->nlmsg_seq);

	msg_seq = nla_get_u32(nltb[IWPM_NLA_MANAGE_MAPPING_SEQ]);
	nlmsg_request = iwpm_find_nlmsg_request(msg_seq);
	if (!nlmsg_request) {
		pr_info("%s: Could not find a matching request (seq = %u)\n",
				 __func__, msg_seq);
		return -EINVAL;
	}
	pm_msg = nlmsg_request->req_buffer;
	local_sockaddr = (struct sockaddr_storage *)
			nla_data(nltb[IWPM_NLA_MANAGE_ADDR]);
	mapped_sockaddr = (struct sockaddr_storage *)
			nla_data(nltb[IWPM_NLA_MANAGE_MAPPED_LOC_ADDR]);

	if (iwpm_compare_sockaddr(local_sockaddr, &pm_msg->loc_addr)) {
		nlmsg_request->err_code = IWPM_USER_LIB_INFO_ERR;
		goto add_mapping_response_exit;
	}
	if (mapped_sockaddr->ss_family != local_sockaddr->ss_family) {
		pr_info("%s: Sockaddr family doesn't match the requested one\n",
				__func__);
		nlmsg_request->err_code = IWPM_USER_LIB_INFO_ERR;
		goto add_mapping_response_exit;
	}
	memcpy(&pm_msg->mapped_loc_addr, mapped_sockaddr,
			sizeof(*mapped_sockaddr));
	iwpm_print_sockaddr(&pm_msg->loc_addr,
			"add_mapping: Local sockaddr:");
	iwpm_print_sockaddr(&pm_msg->mapped_loc_addr,
			"add_mapping: Mapped local sockaddr:");

add_mapping_response_exit:
	nlmsg_request->request_done = 1;
	/* always for found request */
	kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
	barrier();
	up(&nlmsg_request->sem);
	return 0;
}

/* netlink attribute policy for the response to add and query mapping request
 * and response with remote address info */
static const struct nla_policy resp_query_policy[IWPM_NLA_RQUERY_MAPPING_MAX] = {
	[IWPM_NLA_QUERY_MAPPING_SEQ]      = { .type = NLA_U32 },
	[IWPM_NLA_QUERY_LOCAL_ADDR]       = { .len = sizeof(struct sockaddr_storage) },
	[IWPM_NLA_QUERY_REMOTE_ADDR]      = { .len = sizeof(struct sockaddr_storage) },
	[IWPM_NLA_RQUERY_MAPPED_LOC_ADDR] = { .len = sizeof(struct sockaddr_storage) },
	[IWPM_NLA_RQUERY_MAPPED_REM_ADDR] = { .len = sizeof(struct sockaddr_storage) },
	[IWPM_NLA_RQUERY_MAPPING_ERR]	  = { .type = NLA_U16 }
};

/*
 * iwpm_add_and_query_mapping_cb - Process a port mapper response to
 *                                 iwpm_add_and_query_mapping()
 */
int iwpm_add_and_query_mapping_cb(struct sk_buff *skb,
				struct netlink_callback *cb)
{
	struct iwpm_sa_data *pm_msg;
	struct iwpm_nlmsg_request *nlmsg_request = NULL;
	struct nlattr *nltb[IWPM_NLA_RQUERY_MAPPING_MAX];
	struct sockaddr_storage *local_sockaddr, *remote_sockaddr;
	struct sockaddr_storage *mapped_loc_sockaddr, *mapped_rem_sockaddr;
	const char *msg_type;
	u32 msg_seq;
	u16 err_code;

	msg_type = "Query Mapping response";
	if (iwpm_parse_nlmsg(cb, IWPM_NLA_RQUERY_MAPPING_MAX,
				resp_query_policy, nltb, msg_type))
		return -EINVAL;
	atomic_set(&echo_nlmsg_seq, cb->nlh->nlmsg_seq);

	msg_seq = nla_get_u32(nltb[IWPM_NLA_QUERY_MAPPING_SEQ]);
	nlmsg_request = iwpm_find_nlmsg_request(msg_seq);
	if (!nlmsg_request) {
		pr_info("%s: Could not find a matching request (seq = %u)\n",
				 __func__, msg_seq);
		return -EINVAL;
	}
	pm_msg = nlmsg_request->req_buffer;
	local_sockaddr = (struct sockaddr_storage *)
			nla_data(nltb[IWPM_NLA_QUERY_LOCAL_ADDR]);
	remote_sockaddr = (struct sockaddr_storage *)
			nla_data(nltb[IWPM_NLA_QUERY_REMOTE_ADDR]);
	mapped_loc_sockaddr = (struct sockaddr_storage *)
			nla_data(nltb[IWPM_NLA_RQUERY_MAPPED_LOC_ADDR]);
	mapped_rem_sockaddr = (struct sockaddr_storage *)
			nla_data(nltb[IWPM_NLA_RQUERY_MAPPED_REM_ADDR]);

	err_code = nla_get_u16(nltb[IWPM_NLA_RQUERY_MAPPING_ERR]);
	if (err_code == IWPM_REMOTE_QUERY_REJECT) {
		pr_info("%s: Received a Reject (pid = %u, echo seq = %u)\n",
			__func__, cb->nlh->nlmsg_pid, msg_seq);
		nlmsg_request->err_code = IWPM_REMOTE_QUERY_REJECT;
	}
	if (iwpm_compare_sockaddr(local_sockaddr, &pm_msg->loc_addr) ||
		iwpm_compare_sockaddr(remote_sockaddr, &pm_msg->rem_addr)) {
		pr_info("%s: Incorrect local sockaddr\n", __func__);
		nlmsg_request->err_code = IWPM_USER_LIB_INFO_ERR;
		goto query_mapping_response_exit;
	}
	if (mapped_loc_sockaddr->ss_family != local_sockaddr->ss_family ||
		mapped_rem_sockaddr->ss_family != remote_sockaddr->ss_family) {
		pr_info("%s: Sockaddr family doesn't match the requested one\n",
				__func__);
		nlmsg_request->err_code = IWPM_USER_LIB_INFO_ERR;
		goto query_mapping_response_exit;
	}
	memcpy(&pm_msg->mapped_loc_addr, mapped_loc_sockaddr,
			sizeof(*mapped_loc_sockaddr));
	memcpy(&pm_msg->mapped_rem_addr, mapped_rem_sockaddr,
			sizeof(*mapped_rem_sockaddr));

	iwpm_print_sockaddr(&pm_msg->loc_addr,
			"query_mapping: Local sockaddr:");
	iwpm_print_sockaddr(&pm_msg->mapped_loc_addr,
			"query_mapping: Mapped local sockaddr:");
	iwpm_print_sockaddr(&pm_msg->rem_addr,
			"query_mapping: Remote sockaddr:");
	iwpm_print_sockaddr(&pm_msg->mapped_rem_addr,
			"query_mapping: Mapped remote sockaddr:");
query_mapping_response_exit:
	nlmsg_request->request_done = 1;
	/* always for found request */
	kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
	barrier();
	up(&nlmsg_request->sem);
	return 0;
}

/*
 * iwpm_remote_info_cb - Process a port mapper message, containing
 *			  the remote connecting peer address info
 */
int iwpm_remote_info_cb(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct nlattr *nltb[IWPM_NLA_RQUERY_MAPPING_MAX];
	struct sockaddr_storage *local_sockaddr, *remote_sockaddr;
	struct sockaddr_storage *mapped_loc_sockaddr, *mapped_rem_sockaddr;
	struct iwpm_remote_info *rem_info;
	const char *msg_type;
	u8 nl_client;
	int ret = -EINVAL;

	msg_type = "Remote Mapping info";
	if (iwpm_parse_nlmsg(cb, IWPM_NLA_RQUERY_MAPPING_MAX,
				resp_query_policy, nltb, msg_type))
		return ret;

	nl_client = RDMA_NL_GET_CLIENT(cb->nlh->nlmsg_type);
	if (!iwpm_valid_client(nl_client)) {
		pr_info("%s: Invalid port mapper client = %d\n",
				__func__, nl_client);
		return ret;
	}
	atomic_set(&echo_nlmsg_seq, cb->nlh->nlmsg_seq);

	local_sockaddr = (struct sockaddr_storage *)
			nla_data(nltb[IWPM_NLA_QUERY_LOCAL_ADDR]);
	remote_sockaddr = (struct sockaddr_storage *)
			nla_data(nltb[IWPM_NLA_QUERY_REMOTE_ADDR]);
	mapped_loc_sockaddr = (struct sockaddr_storage *)
			nla_data(nltb[IWPM_NLA_RQUERY_MAPPED_LOC_ADDR]);
	mapped_rem_sockaddr = (struct sockaddr_storage *)
			nla_data(nltb[IWPM_NLA_RQUERY_MAPPED_REM_ADDR]);

	if (mapped_loc_sockaddr->ss_family != local_sockaddr->ss_family ||
		mapped_rem_sockaddr->ss_family != remote_sockaddr->ss_family) {
		pr_info("%s: Sockaddr family doesn't match the requested one\n",
				__func__);
		return ret;
	}
	rem_info = kzalloc(sizeof(struct iwpm_remote_info), GFP_ATOMIC);
	if (!rem_info) {
		ret = -ENOMEM;
		return ret;
	}
	memcpy(&rem_info->mapped_loc_sockaddr, mapped_loc_sockaddr,
	       sizeof(struct sockaddr_storage));
	memcpy(&rem_info->remote_sockaddr, remote_sockaddr,
	       sizeof(struct sockaddr_storage));
	memcpy(&rem_info->mapped_rem_sockaddr, mapped_rem_sockaddr,
	       sizeof(struct sockaddr_storage));
	rem_info->nl_client = nl_client;

	iwpm_add_remote_info(rem_info);

	iwpm_print_sockaddr(local_sockaddr,
			"remote_info: Local sockaddr:");
	iwpm_print_sockaddr(mapped_loc_sockaddr,
			"remote_info: Mapped local sockaddr:");
	iwpm_print_sockaddr(remote_sockaddr,
			"remote_info: Remote sockaddr:");
	iwpm_print_sockaddr(mapped_rem_sockaddr,
			"remote_info: Mapped remote sockaddr:");
	return ret;
}

/* netlink attribute policy for the received request for mapping info */
static const struct nla_policy resp_mapinfo_policy[IWPM_NLA_MAPINFO_REQ_MAX] = {
	[IWPM_NLA_MAPINFO_ULIB_NAME] = { .type = NLA_STRING,
					.len = IWPM_ULIBNAME_SIZE - 1 },
	[IWPM_NLA_MAPINFO_ULIB_VER]  = { .type = NLA_U16 }
};

/*
 * iwpm_mapping_info_cb - Process a port mapper request for mapping info
 */
int iwpm_mapping_info_cb(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct nlattr *nltb[IWPM_NLA_MAPINFO_REQ_MAX];
	const char *msg_type = "Mapping Info response";
	u8 nl_client;
	char *iwpm_name;
	u16 iwpm_version;
	int ret = -EINVAL;

	if (iwpm_parse_nlmsg(cb, IWPM_NLA_MAPINFO_REQ_MAX,
				resp_mapinfo_policy, nltb, msg_type)) {
		pr_info("%s: Unable to parse nlmsg\n", __func__);
		return ret;
	}
	iwpm_name = (char *)nla_data(nltb[IWPM_NLA_MAPINFO_ULIB_NAME]);
	iwpm_version = nla_get_u16(nltb[IWPM_NLA_MAPINFO_ULIB_VER]);
	if (strcmp(iwpm_ulib_name, iwpm_name) ||
			iwpm_version != iwpm_ulib_version) {
		pr_info("%s: Invalid port mapper name = %s version = %d\n",
				__func__, iwpm_name, iwpm_version);
		return ret;
	}
	nl_client = RDMA_NL_GET_CLIENT(cb->nlh->nlmsg_type);
	if (!iwpm_valid_client(nl_client)) {
		pr_info("%s: Invalid port mapper client = %d\n",
				__func__, nl_client);
		return ret;
	}
	iwpm_set_registration(nl_client, IWPM_REG_INCOMPL);
	atomic_set(&echo_nlmsg_seq, cb->nlh->nlmsg_seq);
	iwpm_user_pid = cb->nlh->nlmsg_pid;
	if (!iwpm_mapinfo_available())
		return 0;
	pr_debug("%s: iWarp Port Mapper (pid = %d) is available!\n",
		 __func__, iwpm_user_pid);
	ret = iwpm_send_mapinfo(nl_client, iwpm_user_pid);
	return ret;
}

/* netlink attribute policy for the received mapping info ack */
static const struct nla_policy ack_mapinfo_policy[IWPM_NLA_MAPINFO_NUM_MAX] = {
	[IWPM_NLA_MAPINFO_SEQ]    =   { .type = NLA_U32 },
	[IWPM_NLA_MAPINFO_SEND_NUM] = { .type = NLA_U32 },
	[IWPM_NLA_MAPINFO_ACK_NUM] =  { .type = NLA_U32 }
};

/*
 * iwpm_ack_mapping_info_cb - Process a port mapper ack for
 *                            the provided mapping info records
 */
int iwpm_ack_mapping_info_cb(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct nlattr *nltb[IWPM_NLA_MAPINFO_NUM_MAX];
	u32 mapinfo_send, mapinfo_ack;
	const char *msg_type = "Mapping Info Ack";

	if (iwpm_parse_nlmsg(cb, IWPM_NLA_MAPINFO_NUM_MAX,
				ack_mapinfo_policy, nltb, msg_type))
		return -EINVAL;
	mapinfo_send = nla_get_u32(nltb[IWPM_NLA_MAPINFO_SEND_NUM]);
	mapinfo_ack = nla_get_u32(nltb[IWPM_NLA_MAPINFO_ACK_NUM]);
	if (mapinfo_ack != mapinfo_send)
		pr_info("%s: Invalid mapinfo number (sent = %u ack-ed = %u)\n",
			__func__, mapinfo_send, mapinfo_ack);
	atomic_set(&echo_nlmsg_seq, cb->nlh->nlmsg_seq);
	return 0;
}

/* netlink attribute policy for the received port mapper error message */
static const struct nla_policy map_error_policy[IWPM_NLA_ERR_MAX] = {
	[IWPM_NLA_ERR_SEQ]        = { .type = NLA_U32 },
	[IWPM_NLA_ERR_CODE]       = { .type = NLA_U16 },
};

/*
 * iwpm_mapping_error_cb - Process a port mapper error message
 */
int iwpm_mapping_error_cb(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct iwpm_nlmsg_request *nlmsg_request = NULL;
	int nl_client = RDMA_NL_GET_CLIENT(cb->nlh->nlmsg_type);
	struct nlattr *nltb[IWPM_NLA_ERR_MAX];
	u32 msg_seq;
	u16 err_code;
	const char *msg_type = "Mapping Error Msg";

	if (iwpm_parse_nlmsg(cb, IWPM_NLA_ERR_MAX,
				map_error_policy, nltb, msg_type))
		return -EINVAL;

	msg_seq = nla_get_u32(nltb[IWPM_NLA_ERR_SEQ]);
	err_code = nla_get_u16(nltb[IWPM_NLA_ERR_CODE]);
	pr_info("%s: Received msg seq = %u err code = %u client = %d\n",
				__func__, msg_seq, err_code, nl_client);
	/* look for nlmsg_request */
	nlmsg_request = iwpm_find_nlmsg_request(msg_seq);
	if (!nlmsg_request) {
		/* not all errors have associated requests */
		pr_debug("Could not find matching req (seq = %u)\n", msg_seq);
		return 0;
	}
	atomic_set(&echo_nlmsg_seq, cb->nlh->nlmsg_seq);
	nlmsg_request->err_code = err_code;
	nlmsg_request->request_done = 1;
	/* always for found request */
	kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
	barrier();
	up(&nlmsg_request->sem);
	return 0;
}