summaryrefslogtreecommitdiffstats
path: root/include/net/pkt_cls.h
blob: 537d0a0ad4c4615449414ffdb9fbea8110e2c008 (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
#ifndef __NET_PKT_CLS_H
#define __NET_PKT_CLS_H

#include <linux/pkt_cls.h>
#include <net/sch_generic.h>
#include <net/act_api.h>

/* Basic packet classifier frontend definitions. */

struct tcf_walker {
	int	stop;
	int	skip;
	int	count;
	int	(*fn)(struct tcf_proto *, unsigned long node, struct tcf_walker *);
};

int register_tcf_proto_ops(struct tcf_proto_ops *ops);
int unregister_tcf_proto_ops(struct tcf_proto_ops *ops);

#ifdef CONFIG_NET_CLS
struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
				bool create);
void tcf_chain_put(struct tcf_chain *chain);
int tcf_block_get(struct tcf_block **p_block,
		  struct tcf_proto __rcu **p_filter_chain);
void tcf_block_put(struct tcf_block *block);
int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
		 struct tcf_result *res, bool compat_mode);

#else
static inline
int tcf_block_get(struct tcf_block **p_block,
		  struct tcf_proto __rcu **p_filter_chain)
{
	return 0;
}

static inline void tcf_block_put(struct tcf_block *block)
{
}

static inline int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
			       struct tcf_result *res, bool compat_mode)
{
	return TC_ACT_UNSPEC;
}
#endif

static inline unsigned long
__cls_set_class(unsigned long *clp, unsigned long cl)
{
	return xchg(clp, cl);
}

static inline unsigned long
cls_set_class(struct tcf_proto *tp, unsigned long *clp, 
	unsigned long cl)
{
	unsigned long old_cl;
	
	tcf_tree_lock(tp);
	old_cl = __cls_set_class(clp, cl);
	tcf_tree_unlock(tp);
 
	return old_cl;
}

static inline void
tcf_bind_filter(struct tcf_proto *tp, struct tcf_result *r, unsigned long base)
{
	unsigned long cl;

	cl = tp->q->ops->cl_ops->bind_tcf(tp->q, base, r->classid);
	cl = cls_set_class(tp, &r->class, cl);
	if (cl)
		tp->q->ops->cl_ops->unbind_tcf(tp->q, cl);
}

static inline void
tcf_unbind_filter(struct tcf_proto *tp, struct tcf_result *r)
{
	unsigned long cl;

	if ((cl = __cls_set_class(&r->class, 0)) != 0)
		tp->q->ops->cl_ops->unbind_tcf(tp->q, cl);
}

struct tcf_exts {
#ifdef CONFIG_NET_CLS_ACT
	__u32	type; /* for backward compat(TCA_OLD_COMPAT) */
	int nr_actions;
	struct tc_action **actions;
#endif
	/* Map to export classifier specific extension TLV types to the
	 * generic extensions API. Unsupported extensions must be set to 0.
	 */
	int action;
	int police;
};

static inline int tcf_exts_init(struct tcf_exts *exts, int action, int police)
{
#ifdef CONFIG_NET_CLS_ACT
	exts->type = 0;
	exts->nr_actions = 0;
	exts->actions = kcalloc(TCA_ACT_MAX_PRIO, sizeof(struct tc_action *),
				GFP_KERNEL);
	if (!exts->actions)
		return -ENOMEM;
#endif
	exts->action = action;
	exts->police = police;
	return 0;
}

/**
 * tcf_exts_is_predicative - check if a predicative extension is present
 * @exts: tc filter extensions handle
 *
 * Returns 1 if a predicative extension is present, i.e. an extension which
 * might cause further actions and thus overrule the regular tcf_result.
 */
static inline int
tcf_exts_is_predicative(struct tcf_exts *exts)
{
#ifdef CONFIG_NET_CLS_ACT
	return exts->nr_actions;
#else
	return 0;
#endif
}

/**
 * tcf_exts_is_available - check if at least one extension is present
 * @exts: tc filter extensions handle
 *
 * Returns 1 if at least one extension is present.
 */
static inline int
tcf_exts_is_available(struct tcf_exts *exts)
{
	/* All non-predicative extensions must be added here. */
	return tcf_exts_is_predicative(exts);
}

static inline void tcf_exts_to_list(const struct tcf_exts *exts,
				    struct list_head *actions)
{
#ifdef CONFIG_NET_CLS_ACT
	int i;

	for (i = 0; i < exts->nr_actions; i++) {
		struct tc_action *a = exts->actions[i];

		list_add_tail(&a->list, actions);
	}
#endif
}

static inline void
tcf_exts_stats_update(const struct tcf_exts *exts,
		      u64 bytes, u64 packets, u64 lastuse)
{
#ifdef CONFIG_NET_CLS_ACT
	int i;

	preempt_disable();

	for (i = 0; i < exts->nr_actions; i++) {
		struct tc_action *a = exts->actions[i];

		tcf_action_stats_update(a, bytes, packets, lastuse);
	}

	preempt_enable();
#endif
}

/**
 * tcf_exts_exec - execute tc filter extensions
 * @skb: socket buffer
 * @exts: tc filter extensions handle
 * @res: desired result
 *
 * Executes all configured extensions. Returns 0 on a normal execution,
 * a negative number if the filter must be considered unmatched or
 * a positive action code (TC_ACT_*) which must be returned to the
 * underlying layer.
 */
static inline int
tcf_exts_exec(struct sk_buff *skb, struct tcf_exts *exts,
	       struct tcf_result *res)
{
#ifdef CONFIG_NET_CLS_ACT
	if (exts->nr_actions)
		return tcf_action_exec(skb, exts->actions, exts->nr_actions,
				       res);
#endif
	return 0;
}

#ifdef CONFIG_NET_CLS_ACT

#define tc_no_actions(_exts)  ((_exts)->nr_actions == 0)
#define tc_single_action(_exts) ((_exts)->nr_actions == 1)

#else /* CONFIG_NET_CLS_ACT */

#define tc_no_actions(_exts) true
#define tc_single_action(_exts) false

#endif /* CONFIG_NET_CLS_ACT */

int tcf_exts_validate(struct net *net, struct tcf_proto *tp,
		      struct nlattr **tb, struct nlattr *rate_tlv,
		      struct tcf_exts *exts, bool ovr);
void tcf_exts_destroy(struct tcf_exts *exts);
void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst,
		     struct tcf_exts *src);
int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts);
int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts);
int tcf_exts_get_dev(struct net_device *dev, struct tcf_exts *exts,
		     struct net_device **hw_dev);

/**
 * struct tcf_pkt_info - packet information
 */
struct tcf_pkt_info {
	unsigned char *		ptr;
	int			nexthdr;
};

#ifdef CONFIG_NET_EMATCH

struct tcf_ematch_ops;

/**
 * struct tcf_ematch - extended match (ematch)
 * 
 * @matchid: identifier to allow userspace to reidentify a match
 * @flags: flags specifying attributes and the relation to other matches
 * @ops: the operations lookup table of the corresponding ematch module
 * @datalen: length of the ematch specific configuration data
 * @data: ematch specific data
 */
struct tcf_ematch {
	struct tcf_ematch_ops * ops;
	unsigned long		data;
	unsigned int		datalen;
	u16			matchid;
	u16			flags;
	struct net		*net;
};

static inline int tcf_em_is_container(struct tcf_ematch *em)
{
	return !em->ops;
}

static inline int tcf_em_is_simple(struct tcf_ematch *em)
{
	return em->flags & TCF_EM_SIMPLE;
}

static inline int tcf_em_is_inverted(struct tcf_ematch *em)
{
	return em->flags & TCF_EM_INVERT;
}

static inline int tcf_em_last_match(struct tcf_ematch *em)
{
	return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END;
}

static inline int tcf_em_early_end(struct tcf_ematch *em, int result)
{
	if (tcf_em_last_match(em))
		return 1;

	if (result == 0 && em->flags & TCF_EM_REL_AND)
		return 1;

	if (result != 0 && em->flags & TCF_EM_REL_OR)
		return 1;

	return 0;
}
	
/**
 * struct tcf_ematch_tree - ematch tree handle
 *
 * @hdr: ematch tree header supplied by userspace
 * @matches: array of ematches
 */
struct tcf_ematch_tree {
	struct tcf_ematch_tree_hdr hdr;
	struct tcf_ematch *	matches;
	
};

/**
 * struct tcf_ematch_ops - ematch module operations
 * 
 * @kind: identifier (kind) of this ematch module
 * @datalen: length of expected configuration data (optional)
 * @change: called during validation (optional)
 * @match: called during ematch tree evaluation, must return 1/0
 * @destroy: called during destroyage (optional)
 * @dump: called during dumping process (optional)
 * @owner: owner, must be set to THIS_MODULE
 * @link: link to previous/next ematch module (internal use)
 */
struct tcf_ematch_ops {
	int			kind;
	int			datalen;
	int			(*change)(struct net *net, void *,
					  int, struct tcf_ematch *);
	int			(*match)(struct sk_buff *, struct tcf_ematch *,
					 struct tcf_pkt_info *);
	void			(*destroy)(struct tcf_ematch *);
	int			(*dump)(struct sk_buff *, struct tcf_ematch *);
	struct module		*owner;
	struct list_head	link;
};

int tcf_em_register(struct tcf_ematch_ops *);
void tcf_em_unregister(struct tcf_ematch_ops *);
int tcf_em_tree_validate(struct tcf_proto *, struct nlattr *,
			 struct tcf_ematch_tree *);
void tcf_em_tree_destroy(struct tcf_ematch_tree *);
int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int);
int __tcf_em_tree_match(struct sk_buff *, struct tcf_ematch_tree *,
			struct tcf_pkt_info *);

/**
 * tcf_em_tree_change - replace ematch tree of a running classifier
 *
 * @tp: classifier kind handle
 * @dst: destination ematch tree variable
 * @src: source ematch tree (temporary tree from tcf_em_tree_validate)
 *
 * This functions replaces the ematch tree in @dst with the ematch
 * tree in @src. The classifier in charge of the ematch tree may be
 * running.
 */
static inline void tcf_em_tree_change(struct tcf_proto *tp,
				      struct tcf_ematch_tree *dst,
				      struct tcf_ematch_tree *src)
{
	tcf_tree_lock(tp);
	memcpy(dst, src, sizeof(*dst));
	tcf_tree_unlock(tp);
}

/**
 * tcf_em_tree_match - evaulate an ematch tree
 *
 * @skb: socket buffer of the packet in question
 * @tree: ematch tree to be used for evaluation
 * @info: packet information examined by classifier
 *
 * This function matches @skb against the ematch tree in @tree by going
 * through all ematches respecting their logic relations returning
 * as soon as the result is obvious.
 *
 * Returns 1 if the ematch tree as-one matches, no ematches are configured
 * or ematch is not enabled in the kernel, otherwise 0 is returned.
 */
static inline int tcf_em_tree_match(struct sk_buff *skb,
				    struct tcf_ematch_tree *tree,
				    struct tcf_pkt_info *info)
{
	if (tree->hdr.nmatches)
		return __tcf_em_tree_match(skb, tree, info);
	else
		return 1;
}

#define MODULE_ALIAS_TCF_EMATCH(kind)	MODULE_ALIAS("ematch-kind-" __stringify(kind))

#else /* CONFIG_NET_EMATCH */

struct tcf_ematch_tree {
};

#define tcf_em_tree_validate(tp, tb, t) ((void)(t), 0)
#define tcf_em_tree_destroy(t) do { (void)(t); } while(0)
#define tcf_em_tree_dump(skb, t, tlv) (0)
#define tcf_em_tree_change(tp, dst, src) do { } while(0)
#define tcf_em_tree_match(skb, t, info) ((void)(info), 1)

#endif /* CONFIG_NET_EMATCH */

static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer)
{
	switch (layer) {
		case TCF_LAYER_LINK:
			return skb->data;
		case TCF_LAYER_NETWORK:
			return skb_network_header(skb);
		case TCF_LAYER_TRANSPORT:
			return skb_transport_header(skb);
	}

	return NULL;
}

static inline int tcf_valid_offset(const struct sk_buff *skb,
				   const unsigned char *ptr, const int len)
{
	return likely((ptr + len) <= skb_tail_pointer(skb) &&
		      ptr >= skb->head &&
		      (ptr <= (ptr + len)));
}

#ifdef CONFIG_NET_CLS_IND
#include <net/net_namespace.h>

static inline int
tcf_change_indev(struct net *net, struct nlattr *indev_tlv)
{
	char indev[IFNAMSIZ];
	struct net_device *dev;

	if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ)
		return -EINVAL;
	dev = __dev_get_by_name(net, indev);
	if (!dev)
		return -ENODEV;
	return dev->ifindex;
}

static inline bool
tcf_match_indev(struct sk_buff *skb, int ifindex)
{
	if (!ifindex)
		return true;
	if  (!skb->skb_iif)
		return false;
	return ifindex == skb->skb_iif;
}
#endif /* CONFIG_NET_CLS_IND */

struct tc_cls_u32_knode {
	struct tcf_exts *exts;
	struct tc_u32_sel *sel;
	u32 handle;
	u32 val;
	u32 mask;
	u32 link_handle;
	u8 fshift;
};

struct tc_cls_u32_hnode {
	u32 handle;
	u32 prio;
	unsigned int divisor;
};

enum tc_clsu32_command {
	TC_CLSU32_NEW_KNODE,
	TC_CLSU32_REPLACE_KNODE,
	TC_CLSU32_DELETE_KNODE,
	TC_CLSU32_NEW_HNODE,
	TC_CLSU32_REPLACE_HNODE,
	TC_CLSU32_DELETE_HNODE,
};

struct tc_cls_u32_offload {
	/* knode values */
	enum tc_clsu32_command command;
	union {
		struct tc_cls_u32_knode knode;
		struct tc_cls_u32_hnode hnode;
	};
};

static inline bool tc_can_offload(const struct net_device *dev,
				  const struct tcf_proto *tp)
{
	const struct Qdisc *sch = tp->q;
	const struct Qdisc_class_ops *cops = sch->ops->cl_ops;

	if (!(dev->features & NETIF_F_HW_TC))
		return false;
	if (!dev->netdev_ops->ndo_setup_tc)
		return false;
	if (cops && cops->tcf_cl_offload)
		return cops->tcf_cl_offload(tp->classid);

	return true;
}

static inline bool tc_skip_hw(u32 flags)
{
	return (flags & TCA_CLS_FLAGS_SKIP_HW) ? true : false;
}

static inline bool tc_should_offload(const struct net_device *dev,
				     const struct tcf_proto *tp, u32 flags)
{
	if (tc_skip_hw(flags))
		return false;
	return tc_can_offload(dev, tp);
}

static inline bool tc_skip_sw(u32 flags)
{
	return (flags & TCA_CLS_FLAGS_SKIP_SW) ? true : false;
}

/* SKIP_HW and SKIP_SW are mutually exclusive flags. */
static inline bool tc_flags_valid(u32 flags)
{
	if (flags & ~(TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW))
		return false;

	if (!(flags ^ (TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW)))
		return false;

	return true;
}

static inline bool tc_in_hw(u32 flags)
{
	return (flags & TCA_CLS_FLAGS_IN_HW) ? true : false;
}

enum tc_fl_command {
	TC_CLSFLOWER_REPLACE,
	TC_CLSFLOWER_DESTROY,
	TC_CLSFLOWER_STATS,
};

struct tc_cls_flower_offload {
	enum tc_fl_command command;
	u32 prio;
	unsigned long cookie;
	struct flow_dissector *dissector;
	struct fl_flow_key *mask;
	struct fl_flow_key *key;
	struct tcf_exts *exts;
};

enum tc_matchall_command {
	TC_CLSMATCHALL_REPLACE,
	TC_CLSMATCHALL_DESTROY,
};

struct tc_cls_matchall_offload {
	enum tc_matchall_command command;
	struct tcf_exts *exts;
	unsigned long cookie;
};

enum tc_clsbpf_command {
	TC_CLSBPF_ADD,
	TC_CLSBPF_REPLACE,
	TC_CLSBPF_DESTROY,
	TC_CLSBPF_STATS,
};

struct tc_cls_bpf_offload {
	enum tc_clsbpf_command command;
	struct tcf_exts *exts;
	struct bpf_prog *prog;
	const char *name;
	bool exts_integrated;
	u32 gen_flags;
};


/* This structure holds cookie structure that is passed from user
 * to the kernel for actions and classifiers
 */
struct tc_cookie {
	u8  *data;
	u32 len;
};
#endif