aboutsummaryrefslogtreecommitdiffstats
path: root/net/sched/act_tunnel_key.c
blob: b25e5124f571b2207dfce77d6f598454678e3694 (plain) (blame)
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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (c) 2016, Amir Vadai <amir@vadai.me>
 * Copyright (c) 2016, Mellanox Technologies. All rights reserved.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <net/geneve.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <net/dst.h>
#include <net/pkt_cls.h>

#include <linux/tc_act/tc_tunnel_key.h>
#include <net/tc_act/tc_tunnel_key.h>

static unsigned int tunnel_key_net_id;
static struct tc_action_ops act_tunnel_key_ops;

static int tunnel_key_act(struct sk_buff *skb, const struct tc_action *a,
			  struct tcf_result *res)
{
	struct tcf_tunnel_key *t = to_tunnel_key(a);
	struct tcf_tunnel_key_params *params;
	int action;

	params = rcu_dereference_bh(t->params);

	tcf_lastuse_update(&t->tcf_tm);
	tcf_action_update_bstats(&t->common, skb);
	action = READ_ONCE(t->tcf_action);

	switch (params->tcft_action) {
	case TCA_TUNNEL_KEY_ACT_RELEASE:
		skb_dst_drop(skb);
		break;
	case TCA_TUNNEL_KEY_ACT_SET:
		skb_dst_drop(skb);
		skb_dst_set(skb, dst_clone(&params->tcft_enc_metadata->dst));
		break;
	default:
		WARN_ONCE(1, "Bad tunnel_key action %d.\n",
			  params->tcft_action);
		break;
	}

	return action;
}

static const struct nla_policy
enc_opts_policy[TCA_TUNNEL_KEY_ENC_OPTS_MAX + 1] = {
	[TCA_TUNNEL_KEY_ENC_OPTS_GENEVE]	= { .type = NLA_NESTED },
};

static const struct nla_policy
geneve_opt_policy[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX + 1] = {
	[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS]	   = { .type = NLA_U16 },
	[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE]	   = { .type = NLA_U8 },
	[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]	   = { .type = NLA_BINARY,
						       .len = 128 },
};

static int
tunnel_key_copy_geneve_opt(const struct nlattr *nla, void *dst, int dst_len,
			   struct netlink_ext_ack *extack)
{
	struct nlattr *tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX + 1];
	int err, data_len, opt_len;
	u8 *data;

	err = nla_parse_nested_deprecated(tb,
					  TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX,
					  nla, geneve_opt_policy, extack);
	if (err < 0)
		return err;

	if (!tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS] ||
	    !tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE] ||
	    !tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]) {
		NL_SET_ERR_MSG(extack, "Missing tunnel key geneve option class, type or data");
		return -EINVAL;
	}

	data = nla_data(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]);
	data_len = nla_len(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]);
	if (data_len < 4) {
		NL_SET_ERR_MSG(extack, "Tunnel key geneve option data is less than 4 bytes long");
		return -ERANGE;
	}
	if (data_len % 4) {
		NL_SET_ERR_MSG(extack, "Tunnel key geneve option data is not a multiple of 4 bytes long");
		return -ERANGE;
	}

	opt_len = sizeof(struct geneve_opt) + data_len;
	if (dst) {
		struct geneve_opt *opt = dst;

		WARN_ON(dst_len < opt_len);

		opt->opt_class =
			nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS]);
		opt->type = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE]);
		opt->length = data_len / 4; /* length is in units of 4 bytes */
		opt->r1 = 0;
		opt->r2 = 0;
		opt->r3 = 0;

		memcpy(opt + 1, data, data_len);
	}

	return opt_len;
}

static int tunnel_key_copy_opts(const struct nlattr *nla, u8 *dst,
				int dst_len, struct netlink_ext_ack *extack)
{
	int err, rem, opt_len, len = nla_len(nla), opts_len = 0;
	const struct nlattr *attr, *head = nla_data(nla);

	err = nla_validate_deprecated(head, len, TCA_TUNNEL_KEY_ENC_OPTS_MAX,
				      enc_opts_policy, extack);
	if (err)
		return err;

	nla_for_each_attr(attr, head, len, rem) {
		switch (nla_type(attr)) {
		case TCA_TUNNEL_KEY_ENC_OPTS_GENEVE:
			opt_len = tunnel_key_copy_geneve_opt(attr, dst,
							     dst_len, extack);
			if (opt_len < 0)
				return opt_len;
			opts_len += opt_len;
			if (dst) {
				dst_len -= opt_len;
				dst += opt_len;
			}
			break;
		}
	}

	if (!opts_len) {
		NL_SET_ERR_MSG(extack, "Empty list of tunnel options");
		return -EINVAL;
	}

	if (rem > 0) {
		NL_SET_ERR_MSG(extack, "Trailing data after parsing tunnel key options attributes");
		return -EINVAL;
	}

	return opts_len;
}

static int tunnel_key_get_opts_len(struct nlattr *nla,
				   struct netlink_ext_ack *extack)
{
	return tunnel_key_copy_opts(nla, NULL, 0, extack);
}

static int tunnel_key_opts_set(struct nlattr *nla, struct ip_tunnel_info *info,
			       int opts_len, struct netlink_ext_ack *extack)
{
	info->options_len = opts_len;
	switch (nla_type(nla_data(nla))) {
	case TCA_TUNNEL_KEY_ENC_OPTS_GENEVE:
#if IS_ENABLED(CONFIG_INET)
		info->key.tun_flags |= TUNNEL_GENEVE_OPT;
		return tunnel_key_copy_opts(nla, ip_tunnel_info_opts(info),
					    opts_len, extack);
#else
		return -EAFNOSUPPORT;
#endif
	default:
		NL_SET_ERR_MSG(extack, "Cannot set tunnel options for unknown tunnel type");
		return -EINVAL;
	}
}

static const struct nla_policy tunnel_key_policy[TCA_TUNNEL_KEY_MAX + 1] = {
	[TCA_TUNNEL_KEY_PARMS]	    = { .len = sizeof(struct tc_tunnel_key) },
	[TCA_TUNNEL_KEY_ENC_IPV4_SRC] = { .type = NLA_U32 },
	[TCA_TUNNEL_KEY_ENC_IPV4_DST] = { .type = NLA_U32 },
	[TCA_TUNNEL_KEY_ENC_IPV6_SRC] = { .len = sizeof(struct in6_addr) },
	[TCA_TUNNEL_KEY_ENC_IPV6_DST] = { .len = sizeof(struct in6_addr) },
	[TCA_TUNNEL_KEY_ENC_KEY_ID]   = { .type = NLA_U32 },
	[TCA_TUNNEL_KEY_ENC_DST_PORT] = {.type = NLA_U16},
	[TCA_TUNNEL_KEY_NO_CSUM]      = { .type = NLA_U8 },
	[TCA_TUNNEL_KEY_ENC_OPTS]     = { .type = NLA_NESTED },
	[TCA_TUNNEL_KEY_ENC_TOS]      = { .type = NLA_U8 },
	[TCA_TUNNEL_KEY_ENC_TTL]      = { .type = NLA_U8 },
};

static void tunnel_key_release_params(struct tcf_tunnel_key_params *p)
{
	if (!p)
		return;
	if (p->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
		dst_release(&p->tcft_enc_metadata->dst);

	kfree_rcu(p, rcu);
}

static int tunnel_key_init(struct net *net, struct nlattr *nla,
			   struct nlattr *est, struct tc_action **a,
			   int ovr, int bind, bool rtnl_held,
			   struct tcf_proto *tp, u32 act_flags,
			   struct netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
	struct nlattr *tb[TCA_TUNNEL_KEY_MAX + 1];
	struct tcf_tunnel_key_params *params_new;
	struct metadata_dst *metadata = NULL;
	struct tcf_chain *goto_ch = NULL;
	struct tc_tunnel_key *parm;
	struct tcf_tunnel_key *t;
	bool exists = false;
	__be16 dst_port = 0;
	__be64 key_id = 0;
	int opts_len = 0;
	__be16 flags = 0;
	u8 tos, ttl;
	int ret = 0;
	u32 index;
	int err;

	if (!nla) {
		NL_SET_ERR_MSG(extack, "Tunnel requires attributes to be passed");
		return -EINVAL;
	}

	err = nla_parse_nested_deprecated(tb, TCA_TUNNEL_KEY_MAX, nla,
					  tunnel_key_policy, extack);
	if (err < 0) {
		NL_SET_ERR_MSG(extack, "Failed to parse nested tunnel key attributes");
		return err;
	}

	if (!tb[TCA_TUNNEL_KEY_PARMS]) {
		NL_SET_ERR_MSG(extack, "Missing tunnel key parameters");
		return -EINVAL;
	}

	parm = nla_data(tb[TCA_TUNNEL_KEY_PARMS]);
	index = parm->index;
	err = tcf_idr_check_alloc(tn, &index, a, bind);
	if (err < 0)
		return err;
	exists = err;
	if (exists && bind)
		return 0;

	switch (parm->t_action) {
	case TCA_TUNNEL_KEY_ACT_RELEASE:
		break;
	case TCA_TUNNEL_KEY_ACT_SET:
		if (tb[TCA_TUNNEL_KEY_ENC_KEY_ID]) {
			__be32 key32;

			key32 = nla_get_be32(tb[TCA_TUNNEL_KEY_ENC_KEY_ID]);
			key_id = key32_to_tunnel_id(key32);
			flags = TUNNEL_KEY;
		}

		flags |= TUNNEL_CSUM;
		if (tb[TCA_TUNNEL_KEY_NO_CSUM] &&
		    nla_get_u8(tb[TCA_TUNNEL_KEY_NO_CSUM]))
			flags &= ~TUNNEL_CSUM;

		if (tb[TCA_TUNNEL_KEY_ENC_DST_PORT])
			dst_port = nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_DST_PORT]);

		if (tb[TCA_TUNNEL_KEY_ENC_OPTS]) {
			opts_len = tunnel_key_get_opts_len(tb[TCA_TUNNEL_KEY_ENC_OPTS],
							   extack);
			if (opts_len < 0) {
				ret = opts_len;
				goto err_out;
			}
		}

		tos = 0;
		if (tb[TCA_TUNNEL_KEY_ENC_TOS])
			tos = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_TOS]);
		ttl = 0;
		if (tb[TCA_TUNNEL_KEY_ENC_TTL])
			ttl = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_TTL]);

		if (tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC] &&
		    tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]) {
			__be32 saddr;
			__be32 daddr;

			saddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC]);
			daddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]);

			metadata = __ip_tun_set_dst(saddr, daddr, tos, ttl,
						    dst_port, flags,
						    key_id, opts_len);
		} else if (tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC] &&
			   tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]) {
			struct in6_addr saddr;
			struct in6_addr daddr;

			saddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC]);
			daddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]);

			metadata = __ipv6_tun_set_dst(&saddr, &daddr, tos, ttl, dst_port,
						      0, flags,
						      key_id, 0);
		} else {
			NL_SET_ERR_MSG(extack, "Missing either ipv4 or ipv6 src and dst");
			ret = -EINVAL;
			goto err_out;
		}

		if (!metadata) {
			NL_SET_ERR_MSG(extack, "Cannot allocate tunnel metadata dst");
			ret = -ENOMEM;
			goto err_out;
		}

#ifdef CONFIG_DST_CACHE
		ret = dst_cache_init(&metadata->u.tun_info.dst_cache, GFP_KERNEL);
		if (ret)
			goto release_tun_meta;
#endif

		if (opts_len) {
			ret = tunnel_key_opts_set(tb[TCA_TUNNEL_KEY_ENC_OPTS],
						  &metadata->u.tun_info,
						  opts_len, extack);
			if (ret < 0)
				goto release_tun_meta;
		}

		metadata->u.tun_info.mode |= IP_TUNNEL_INFO_TX;
		break;
	default:
		NL_SET_ERR_MSG(extack, "Unknown tunnel key action");
		ret = -EINVAL;
		goto err_out;
	}

	if (!exists) {
		ret = tcf_idr_create(tn, index, est, a,
				     &act_tunnel_key_ops, bind, true);
		if (ret) {
			NL_SET_ERR_MSG(extack, "Cannot create TC IDR");
			goto release_tun_meta;
		}

		ret = ACT_P_CREATED;
	} else if (!ovr) {
		NL_SET_ERR_MSG(extack, "TC IDR already exists");
		ret = -EEXIST;
		goto release_tun_meta;
	}

	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	if (err < 0) {
		ret = err;
		exists = true;
		goto release_tun_meta;
	}
	t = to_tunnel_key(*a);

	params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
	if (unlikely(!params_new)) {
		NL_SET_ERR_MSG(extack, "Cannot allocate tunnel key parameters");
		ret = -ENOMEM;
		exists = true;
		goto put_chain;
	}
	params_new->tcft_action = parm->t_action;
	params_new->tcft_enc_metadata = metadata;

	spin_lock_bh(&t->tcf_lock);
	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
	rcu_swap_protected(t->params, params_new,
			   lockdep_is_held(&t->tcf_lock));
	spin_unlock_bh(&t->tcf_lock);
	tunnel_key_release_params(params_new);
	if (goto_ch)
		tcf_chain_put_by_act(goto_ch);

	if (ret == ACT_P_CREATED)
		tcf_idr_insert(tn, *a);

	return ret;

put_chain:
	if (goto_ch)
		tcf_chain_put_by_act(goto_ch);

release_tun_meta:
	if (metadata)
		dst_release(&metadata->dst);

err_out:
	if (exists)
		tcf_idr_release(*a, bind);
	else
		tcf_idr_cleanup(tn, index);
	return ret;
}

static void tunnel_key_release(struct tc_action *a)
{
	struct tcf_tunnel_key *t = to_tunnel_key(a);
	struct tcf_tunnel_key_params *params;

	params = rcu_dereference_protected(t->params, 1);
	tunnel_key_release_params(params);
}

static int tunnel_key_geneve_opts_dump(struct sk_buff *skb,
				       const struct ip_tunnel_info *info)
{
	int len = info->options_len;
	u8 *src = (u8 *)(info + 1);
	struct nlattr *start;

	start = nla_nest_start_noflag(skb, TCA_TUNNEL_KEY_ENC_OPTS_GENEVE);
	if (!start)
		return -EMSGSIZE;

	while (len > 0) {
		struct geneve_opt *opt = (struct geneve_opt *)src;

		if (nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS,
				 opt->opt_class) ||
		    nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE,
			       opt->type) ||
		    nla_put(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA,
			    opt->length * 4, opt + 1)) {
			nla_nest_cancel(skb, start);
			return -EMSGSIZE;
		}

		len -= sizeof(struct geneve_opt) + opt->length * 4;
		src += sizeof(struct geneve_opt) + opt->length * 4;
	}

	nla_nest_end(skb, start);
	return 0;
}

static int tunnel_key_opts_dump(struct sk_buff *skb,
				const struct ip_tunnel_info *info)
{
	struct nlattr *start;
	int err = -EINVAL;

	if (!info->options_len)
		return 0;

	start = nla_nest_start_noflag(skb, TCA_TUNNEL_KEY_ENC_OPTS);
	if (!start)
		return -EMSGSIZE;

	if (info->key.tun_flags & TUNNEL_GENEVE_OPT) {
		err = tunnel_key_geneve_opts_dump(skb, info);
		if (err)
			goto err_out;
	} else {
err_out:
		nla_nest_cancel(skb, start);
		return err;
	}

	nla_nest_end(skb, start);
	return 0;
}

static int tunnel_key_dump_addresses(struct sk_buff *skb,
				     const struct ip_tunnel_info *info)
{
	unsigned short family = ip_tunnel_info_af(info);

	if (family == AF_INET) {
		__be32 saddr = info->key.u.ipv4.src;
		__be32 daddr = info->key.u.ipv4.dst;

		if (!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_SRC, saddr) &&
		    !nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_DST, daddr))
			return 0;
	}

	if (family == AF_INET6) {
		const struct in6_addr *saddr6 = &info->key.u.ipv6.src;
		const struct in6_addr *daddr6 = &info->key.u.ipv6.dst;

		if (!nla_put_in6_addr(skb,
				      TCA_TUNNEL_KEY_ENC_IPV6_SRC, saddr6) &&
		    !nla_put_in6_addr(skb,
				      TCA_TUNNEL_KEY_ENC_IPV6_DST, daddr6))
			return 0;
	}

	return -EINVAL;
}

static int tunnel_key_dump(struct sk_buff *skb, struct tc_action *a,
			   int bind, int ref)
{
	unsigned char *b = skb_tail_pointer(skb);
	struct tcf_tunnel_key *t = to_tunnel_key(a);
	struct tcf_tunnel_key_params *params;
	struct tc_tunnel_key opt = {
		.index    = t->tcf_index,
		.refcnt   = refcount_read(&t->tcf_refcnt) - ref,
		.bindcnt  = atomic_read(&t->tcf_bindcnt) - bind,
	};
	struct tcf_t tm;

	spin_lock_bh(&t->tcf_lock);
	params = rcu_dereference_protected(t->params,
					   lockdep_is_held(&t->tcf_lock));
	opt.action   = t->tcf_action;
	opt.t_action = params->tcft_action;

	if (nla_put(skb, TCA_TUNNEL_KEY_PARMS, sizeof(opt), &opt))
		goto nla_put_failure;

	if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET) {
		struct ip_tunnel_info *info =
			&params->tcft_enc_metadata->u.tun_info;
		struct ip_tunnel_key *key = &info->key;
		__be32 key_id = tunnel_id_to_key32(key->tun_id);

		if (((key->tun_flags & TUNNEL_KEY) &&
		     nla_put_be32(skb, TCA_TUNNEL_KEY_ENC_KEY_ID, key_id)) ||
		    tunnel_key_dump_addresses(skb,
					      &params->tcft_enc_metadata->u.tun_info) ||
		    (key->tp_dst &&
		      nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_DST_PORT,
				   key->tp_dst)) ||
		    nla_put_u8(skb, TCA_TUNNEL_KEY_NO_CSUM,
			       !(key->tun_flags & TUNNEL_CSUM)) ||
		    tunnel_key_opts_dump(skb, info))
			goto nla_put_failure;

		if (key->tos && nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_TOS, key->tos))
			goto nla_put_failure;

		if (key->ttl && nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_TTL, key->ttl))
			goto nla_put_failure;
	}

	tcf_tm_dump(&tm, &t->tcf_tm);
	if (nla_put_64bit(skb, TCA_TUNNEL_KEY_TM, sizeof(tm),
			  &tm, TCA_TUNNEL_KEY_PAD))
		goto nla_put_failure;
	spin_unlock_bh(&t->tcf_lock);

	return skb->len;

nla_put_failure:
	spin_unlock_bh(&t->tcf_lock);
	nlmsg_trim(skb, b);
	return -1;
}

static int tunnel_key_walker(struct net *net, struct sk_buff *skb,
			     struct netlink_callback *cb, int type,
			     const struct tc_action_ops *ops,
			     struct netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);

	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
}

static int tunnel_key_search(struct net *net, struct tc_action **a, u32 index)
{
	struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);

	return tcf_idr_search(tn, a, index);
}

static struct tc_action_ops act_tunnel_key_ops = {
	.kind		=	"tunnel_key",
	.id		=	TCA_ID_TUNNEL_KEY,
	.owner		=	THIS_MODULE,
	.act		=	tunnel_key_act,
	.dump		=	tunnel_key_dump,
	.init		=	tunnel_key_init,
	.cleanup	=	tunnel_key_release,
	.walk		=	tunnel_key_walker,
	.lookup		=	tunnel_key_search,
	.size		=	sizeof(struct tcf_tunnel_key),
};

static __net_init int tunnel_key_init_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);

	return tc_action_net_init(net, tn, &act_tunnel_key_ops);
}

static void __net_exit tunnel_key_exit_net(struct list_head *net_list)
{
	tc_action_net_exit(net_list, tunnel_key_net_id);
}

static struct pernet_operations tunnel_key_net_ops = {
	.init = tunnel_key_init_net,
	.exit_batch = tunnel_key_exit_net,
	.id   = &tunnel_key_net_id,
	.size = sizeof(struct tc_action_net),
};

static int __init tunnel_key_init_module(void)
{
	return tcf_register_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
}

static void __exit tunnel_key_cleanup_module(void)
{
	tcf_unregister_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
}

module_init(tunnel_key_init_module);
module_exit(tunnel_key_cleanup_module);

MODULE_AUTHOR("Amir Vadai <amir@vadai.me>");
MODULE_DESCRIPTION("ip tunnel manipulation actions");
MODULE_LICENSE("GPL v2");