summaryrefslogtreecommitdiff
path: root/net/sched/sch_ingress.c
blob: c2ef9dcf91d2d708bc33a030d7424c75d257c411 (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
// SPDX-License-Identifier: GPL-2.0-or-later
/* net/sched/sch_ingress.c - Ingress and clsact qdisc
 *
 * Authors:     Jamal Hadi Salim 1999
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>

#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <net/pkt_cls.h>
#include <net/tcx.h>

struct ingress_sched_data {
	struct tcf_block *block;
	struct tcf_block_ext_info block_info;
	struct mini_Qdisc_pair miniqp;
};

static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg)
{
	return NULL;
}

static unsigned long ingress_find(struct Qdisc *sch, u32 classid)
{
	return TC_H_MIN(classid) + 1;
}

static unsigned long ingress_bind_filter(struct Qdisc *sch,
					 unsigned long parent, u32 classid)
{
	return ingress_find(sch, classid);
}

static void ingress_unbind_filter(struct Qdisc *sch, unsigned long cl)
{
}

static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker)
{
}

static struct tcf_block *ingress_tcf_block(struct Qdisc *sch, unsigned long cl,
					   struct netlink_ext_ack *extack)
{
	struct ingress_sched_data *q = qdisc_priv(sch);

	return q->block;
}

static void clsact_chain_head_change(struct tcf_proto *tp_head, void *priv)
{
	struct mini_Qdisc_pair *miniqp = priv;

	mini_qdisc_pair_swap(miniqp, tp_head);
};

static void ingress_ingress_block_set(struct Qdisc *sch, u32 block_index)
{
	struct ingress_sched_data *q = qdisc_priv(sch);

	q->block_info.block_index = block_index;
}

static u32 ingress_ingress_block_get(struct Qdisc *sch)
{
	struct ingress_sched_data *q = qdisc_priv(sch);

	return q->block_info.block_index;
}

static int ingress_init(struct Qdisc *sch, struct nlattr *opt,
			struct netlink_ext_ack *extack)
{
	struct ingress_sched_data *q = qdisc_priv(sch);
	struct net_device *dev = qdisc_dev(sch);
	struct bpf_mprog_entry *entry;
	bool created;
	int err;

	if (sch->parent != TC_H_INGRESS)
		return -EOPNOTSUPP;

	net_inc_ingress_queue();

	entry = tcx_entry_fetch_or_create(dev, true, &created);
	if (!entry)
		return -ENOMEM;
	tcx_miniq_set_active(entry, true);
	mini_qdisc_pair_init(&q->miniqp, sch, &tcx_entry(entry)->miniq);
	if (created)
		tcx_entry_update(dev, entry, true);

	q->block_info.binder_type = FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS;
	q->block_info.chain_head_change = clsact_chain_head_change;
	q->block_info.chain_head_change_priv = &q->miniqp;

	err = tcf_block_get_ext(&q->block, sch, &q->block_info, extack);
	if (err)
		return err;

	mini_qdisc_pair_block_init(&q->miniqp, q->block);

	return 0;
}

static void ingress_destroy(struct Qdisc *sch)
{
	struct ingress_sched_data *q = qdisc_priv(sch);
	struct net_device *dev = qdisc_dev(sch);
	struct bpf_mprog_entry *entry = rtnl_dereference(dev->tcx_ingress);

	if (sch->parent != TC_H_INGRESS)
		return;

	tcf_block_put_ext(q->block, sch, &q->block_info);

	if (entry) {
		tcx_miniq_set_active(entry, false);
		if (!tcx_entry_is_active(entry)) {
			tcx_entry_update(dev, NULL, true);
			tcx_entry_free(entry);
		}
	}

	net_dec_ingress_queue();
}

static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb)
{
	struct nlattr *nest;

	nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
	if (nest == NULL)
		goto nla_put_failure;

	return nla_nest_end(skb, nest);

nla_put_failure:
	nla_nest_cancel(skb, nest);
	return -1;
}

static const struct Qdisc_class_ops ingress_class_ops = {
	.flags		=	QDISC_CLASS_OPS_DOIT_UNLOCKED,
	.leaf		=	ingress_leaf,
	.find		=	ingress_find,
	.walk		=	ingress_walk,
	.tcf_block	=	ingress_tcf_block,
	.bind_tcf	=	ingress_bind_filter,
	.unbind_tcf	=	ingress_unbind_filter,
};

static struct Qdisc_ops ingress_qdisc_ops __read_mostly = {
	.cl_ops			=	&ingress_class_ops,
	.id			=	"ingress",
	.priv_size		=	sizeof(struct ingress_sched_data),
	.static_flags		=	TCQ_F_INGRESS | TCQ_F_CPUSTATS,
	.init			=	ingress_init,
	.destroy		=	ingress_destroy,
	.dump			=	ingress_dump,
	.ingress_block_set	=	ingress_ingress_block_set,
	.ingress_block_get	=	ingress_ingress_block_get,
	.owner			=	THIS_MODULE,
};
MODULE_ALIAS_NET_SCH("ingress");

struct clsact_sched_data {
	struct tcf_block *ingress_block;
	struct tcf_block *egress_block;
	struct tcf_block_ext_info ingress_block_info;
	struct tcf_block_ext_info egress_block_info;
	struct mini_Qdisc_pair miniqp_ingress;
	struct mini_Qdisc_pair miniqp_egress;
};

static unsigned long clsact_find(struct Qdisc *sch, u32 classid)
{
	switch (TC_H_MIN(classid)) {
	case TC_H_MIN(TC_H_MIN_INGRESS):
	case TC_H_MIN(TC_H_MIN_EGRESS):
		return TC_H_MIN(classid);
	default:
		return 0;
	}
}

static unsigned long clsact_bind_filter(struct Qdisc *sch,
					unsigned long parent, u32 classid)
{
	return clsact_find(sch, classid);
}

static struct tcf_block *clsact_tcf_block(struct Qdisc *sch, unsigned long cl,
					  struct netlink_ext_ack *extack)
{
	struct clsact_sched_data *q = qdisc_priv(sch);

	switch (cl) {
	case TC_H_MIN(TC_H_MIN_INGRESS):
		return q->ingress_block;
	case TC_H_MIN(TC_H_MIN_EGRESS):
		return q->egress_block;
	default:
		return NULL;
	}
}

static void clsact_ingress_block_set(struct Qdisc *sch, u32 block_index)
{
	struct clsact_sched_data *q = qdisc_priv(sch);

	q->ingress_block_info.block_index = block_index;
}

static void clsact_egress_block_set(struct Qdisc *sch, u32 block_index)
{
	struct clsact_sched_data *q = qdisc_priv(sch);

	q->egress_block_info.block_index = block_index;
}

static u32 clsact_ingress_block_get(struct Qdisc *sch)
{
	struct clsact_sched_data *q = qdisc_priv(sch);

	return q->ingress_block_info.block_index;
}

static u32 clsact_egress_block_get(struct Qdisc *sch)
{
	struct clsact_sched_data *q = qdisc_priv(sch);

	return q->egress_block_info.block_index;
}

static int clsact_init(struct Qdisc *sch, struct nlattr *opt,
		       struct netlink_ext_ack *extack)
{
	struct clsact_sched_data *q = qdisc_priv(sch);
	struct net_device *dev = qdisc_dev(sch);
	struct bpf_mprog_entry *entry;
	bool created;
	int err;

	if (sch->parent != TC_H_CLSACT)
		return -EOPNOTSUPP;

	net_inc_ingress_queue();
	net_inc_egress_queue();

	entry = tcx_entry_fetch_or_create(dev, true, &created);
	if (!entry)
		return -ENOMEM;
	tcx_miniq_set_active(entry, true);
	mini_qdisc_pair_init(&q->miniqp_ingress, sch, &tcx_entry(entry)->miniq);
	if (created)
		tcx_entry_update(dev, entry, true);

	q->ingress_block_info.binder_type = FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS;
	q->ingress_block_info.chain_head_change = clsact_chain_head_change;
	q->ingress_block_info.chain_head_change_priv = &q->miniqp_ingress;

	err = tcf_block_get_ext(&q->ingress_block, sch, &q->ingress_block_info,
				extack);
	if (err)
		return err;

	mini_qdisc_pair_block_init(&q->miniqp_ingress, q->ingress_block);

	entry = tcx_entry_fetch_or_create(dev, false, &created);
	if (!entry)
		return -ENOMEM;
	tcx_miniq_set_active(entry, true);
	mini_qdisc_pair_init(&q->miniqp_egress, sch, &tcx_entry(entry)->miniq);
	if (created)
		tcx_entry_update(dev, entry, false);

	q->egress_block_info.binder_type = FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS;
	q->egress_block_info.chain_head_change = clsact_chain_head_change;
	q->egress_block_info.chain_head_change_priv = &q->miniqp_egress;

	return tcf_block_get_ext(&q->egress_block, sch, &q->egress_block_info, extack);
}

static void clsact_destroy(struct Qdisc *sch)
{
	struct clsact_sched_data *q = qdisc_priv(sch);
	struct net_device *dev = qdisc_dev(sch);
	struct bpf_mprog_entry *ingress_entry = rtnl_dereference(dev->tcx_ingress);
	struct bpf_mprog_entry *egress_entry = rtnl_dereference(dev->tcx_egress);

	if (sch->parent != TC_H_CLSACT)
		return;

	tcf_block_put_ext(q->ingress_block, sch, &q->ingress_block_info);
	tcf_block_put_ext(q->egress_block, sch, &q->egress_block_info);

	if (ingress_entry) {
		tcx_miniq_set_active(ingress_entry, false);
		if (!tcx_entry_is_active(ingress_entry)) {
			tcx_entry_update(dev, NULL, true);
			tcx_entry_free(ingress_entry);
		}
	}

	if (egress_entry) {
		tcx_miniq_set_active(egress_entry, false);
		if (!tcx_entry_is_active(egress_entry)) {
			tcx_entry_update(dev, NULL, false);
			tcx_entry_free(egress_entry);
		}
	}

	net_dec_ingress_queue();
	net_dec_egress_queue();
}

static const struct Qdisc_class_ops clsact_class_ops = {
	.flags		=	QDISC_CLASS_OPS_DOIT_UNLOCKED,
	.leaf		=	ingress_leaf,
	.find		=	clsact_find,
	.walk		=	ingress_walk,
	.tcf_block	=	clsact_tcf_block,
	.bind_tcf	=	clsact_bind_filter,
	.unbind_tcf	=	ingress_unbind_filter,
};

static struct Qdisc_ops clsact_qdisc_ops __read_mostly = {
	.cl_ops			=	&clsact_class_ops,
	.id			=	"clsact",
	.priv_size		=	sizeof(struct clsact_sched_data),
	.static_flags		=	TCQ_F_INGRESS | TCQ_F_CPUSTATS,
	.init			=	clsact_init,
	.destroy		=	clsact_destroy,
	.dump			=	ingress_dump,
	.ingress_block_set	=	clsact_ingress_block_set,
	.egress_block_set	=	clsact_egress_block_set,
	.ingress_block_get	=	clsact_ingress_block_get,
	.egress_block_get	=	clsact_egress_block_get,
	.owner			=	THIS_MODULE,
};
MODULE_ALIAS_NET_SCH("clsact");

static int __init ingress_module_init(void)
{
	int ret;

	ret = register_qdisc(&ingress_qdisc_ops);
	if (!ret) {
		ret = register_qdisc(&clsact_qdisc_ops);
		if (ret)
			unregister_qdisc(&ingress_qdisc_ops);
	}

	return ret;
}

static void __exit ingress_module_exit(void)
{
	unregister_qdisc(&ingress_qdisc_ops);
	unregister_qdisc(&clsact_qdisc_ops);
}

module_init(ingress_module_init);
module_exit(ingress_module_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Ingress and clsact based ingress and egress qdiscs");