summaryrefslogtreecommitdiffstats
path: root/net/sched/act_vlan.c
blob: 0f40d0a74423b8d91bf8bb8838eb382846710851 (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
/*
 * Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

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

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

static unsigned int vlan_net_id;
static struct tc_action_ops act_vlan_ops;

static int tcf_vlan_act(struct sk_buff *skb, const struct tc_action *a,
			struct tcf_result *res)
{
	struct tcf_vlan *v = to_vlan(a);
	struct tcf_vlan_params *p;
	int action;
	int err;
	u16 tci;

	tcf_lastuse_update(&v->tcf_tm);
	bstats_cpu_update(this_cpu_ptr(v->common.cpu_bstats), skb);

	/* Ensure 'data' points at mac_header prior calling vlan manipulating
	 * functions.
	 */
	if (skb_at_tc_ingress(skb))
		skb_push_rcsum(skb, skb->mac_len);

	action = READ_ONCE(v->tcf_action);

	p = rcu_dereference_bh(v->vlan_p);

	switch (p->tcfv_action) {
	case TCA_VLAN_ACT_POP:
		err = skb_vlan_pop(skb);
		if (err)
			goto drop;
		break;
	case TCA_VLAN_ACT_PUSH:
		err = skb_vlan_push(skb, p->tcfv_push_proto, p->tcfv_push_vid |
				    (p->tcfv_push_prio << VLAN_PRIO_SHIFT));
		if (err)
			goto drop;
		break;
	case TCA_VLAN_ACT_MODIFY:
		/* No-op if no vlan tag (either hw-accel or in-payload) */
		if (!skb_vlan_tagged(skb))
			goto out;
		/* extract existing tag (and guarantee no hw-accel tag) */
		if (skb_vlan_tag_present(skb)) {
			tci = skb_vlan_tag_get(skb);
			__vlan_hwaccel_clear_tag(skb);
		} else {
			/* in-payload vlan tag, pop it */
			err = __skb_vlan_pop(skb, &tci);
			if (err)
				goto drop;
		}
		/* replace the vid */
		tci = (tci & ~VLAN_VID_MASK) | p->tcfv_push_vid;
		/* replace prio bits, if tcfv_push_prio specified */
		if (p->tcfv_push_prio) {
			tci &= ~VLAN_PRIO_MASK;
			tci |= p->tcfv_push_prio << VLAN_PRIO_SHIFT;
		}
		/* put updated tci as hwaccel tag */
		__vlan_hwaccel_put_tag(skb, p->tcfv_push_proto, tci);
		break;
	default:
		BUG();
	}

out:
	if (skb_at_tc_ingress(skb))
		skb_pull_rcsum(skb, skb->mac_len);

	return action;

drop:
	qstats_drop_inc(this_cpu_ptr(v->common.cpu_qstats));
	return TC_ACT_SHOT;
}

static const struct nla_policy vlan_policy[TCA_VLAN_MAX + 1] = {
	[TCA_VLAN_PARMS]		= { .len = sizeof(struct tc_vlan) },
	[TCA_VLAN_PUSH_VLAN_ID]		= { .type = NLA_U16 },
	[TCA_VLAN_PUSH_VLAN_PROTOCOL]	= { .type = NLA_U16 },
	[TCA_VLAN_PUSH_VLAN_PRIORITY]	= { .type = NLA_U8 },
};

static int tcf_vlan_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, struct netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, vlan_net_id);
	struct nlattr *tb[TCA_VLAN_MAX + 1];
	struct tcf_chain *goto_ch = NULL;
	struct tcf_vlan_params *p;
	struct tc_vlan *parm;
	struct tcf_vlan *v;
	int action;
	u16 push_vid = 0;
	__be16 push_proto = 0;
	u8 push_prio = 0;
	bool exists = false;
	int ret = 0, err;

	if (!nla)
		return -EINVAL;

	err = nla_parse_nested(tb, TCA_VLAN_MAX, nla, vlan_policy, NULL);
	if (err < 0)
		return err;

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

	switch (parm->v_action) {
	case TCA_VLAN_ACT_POP:
		break;
	case TCA_VLAN_ACT_PUSH:
	case TCA_VLAN_ACT_MODIFY:
		if (!tb[TCA_VLAN_PUSH_VLAN_ID]) {
			if (exists)
				tcf_idr_release(*a, bind);
			else
				tcf_idr_cleanup(tn, parm->index);
			return -EINVAL;
		}
		push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
		if (push_vid >= VLAN_VID_MASK) {
			if (exists)
				tcf_idr_release(*a, bind);
			else
				tcf_idr_cleanup(tn, parm->index);
			return -ERANGE;
		}

		if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) {
			push_proto = nla_get_be16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]);
			switch (push_proto) {
			case htons(ETH_P_8021Q):
			case htons(ETH_P_8021AD):
				break;
			default:
				if (exists)
					tcf_idr_release(*a, bind);
				else
					tcf_idr_cleanup(tn, parm->index);
				return -EPROTONOSUPPORT;
			}
		} else {
			push_proto = htons(ETH_P_8021Q);
		}

		if (tb[TCA_VLAN_PUSH_VLAN_PRIORITY])
			push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]);
		break;
	default:
		if (exists)
			tcf_idr_release(*a, bind);
		else
			tcf_idr_cleanup(tn, parm->index);
		return -EINVAL;
	}
	action = parm->v_action;

	if (!exists) {
		ret = tcf_idr_create(tn, parm->index, est, a,
				     &act_vlan_ops, bind, true);
		if (ret) {
			tcf_idr_cleanup(tn, parm->index);
			return ret;
		}

		ret = ACT_P_CREATED;
	} else if (!ovr) {
		tcf_idr_release(*a, bind);
		return -EEXIST;
	}

	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	if (err < 0)
		goto release_idr;

	v = to_vlan(*a);

	p = kzalloc(sizeof(*p), GFP_KERNEL);
	if (!p) {
		err = -ENOMEM;
		goto put_chain;
	}

	p->tcfv_action = action;
	p->tcfv_push_vid = push_vid;
	p->tcfv_push_prio = push_prio;
	p->tcfv_push_proto = push_proto;

	spin_lock_bh(&v->tcf_lock);
	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
	rcu_swap_protected(v->vlan_p, p, lockdep_is_held(&v->tcf_lock));
	spin_unlock_bh(&v->tcf_lock);

	if (goto_ch)
		tcf_chain_put_by_act(goto_ch);
	if (p)
		kfree_rcu(p, rcu);

	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_idr:
	tcf_idr_release(*a, bind);
	return err;
}

static void tcf_vlan_cleanup(struct tc_action *a)
{
	struct tcf_vlan *v = to_vlan(a);
	struct tcf_vlan_params *p;

	p = rcu_dereference_protected(v->vlan_p, 1);
	if (p)
		kfree_rcu(p, rcu);
}

static int tcf_vlan_dump(struct sk_buff *skb, struct tc_action *a,
			 int bind, int ref)
{
	unsigned char *b = skb_tail_pointer(skb);
	struct tcf_vlan *v = to_vlan(a);
	struct tcf_vlan_params *p;
	struct tc_vlan opt = {
		.index    = v->tcf_index,
		.refcnt   = refcount_read(&v->tcf_refcnt) - ref,
		.bindcnt  = atomic_read(&v->tcf_bindcnt) - bind,
	};
	struct tcf_t t;

	spin_lock_bh(&v->tcf_lock);
	opt.action = v->tcf_action;
	p = rcu_dereference_protected(v->vlan_p, lockdep_is_held(&v->tcf_lock));
	opt.v_action = p->tcfv_action;
	if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt))
		goto nla_put_failure;

	if ((p->tcfv_action == TCA_VLAN_ACT_PUSH ||
	     p->tcfv_action == TCA_VLAN_ACT_MODIFY) &&
	    (nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, p->tcfv_push_vid) ||
	     nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL,
			  p->tcfv_push_proto) ||
	     (nla_put_u8(skb, TCA_VLAN_PUSH_VLAN_PRIORITY,
					      p->tcfv_push_prio))))
		goto nla_put_failure;

	tcf_tm_dump(&t, &v->tcf_tm);
	if (nla_put_64bit(skb, TCA_VLAN_TM, sizeof(t), &t, TCA_VLAN_PAD))
		goto nla_put_failure;
	spin_unlock_bh(&v->tcf_lock);

	return skb->len;

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

static int tcf_vlan_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, vlan_net_id);

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

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

	return tcf_idr_search(tn, a, index);
}

static struct tc_action_ops act_vlan_ops = {
	.kind		=	"vlan",
	.id		=	TCA_ID_VLAN,
	.owner		=	THIS_MODULE,
	.act		=	tcf_vlan_act,
	.dump		=	tcf_vlan_dump,
	.init		=	tcf_vlan_init,
	.cleanup	=	tcf_vlan_cleanup,
	.walk		=	tcf_vlan_walker,
	.lookup		=	tcf_vlan_search,
	.size		=	sizeof(struct tcf_vlan),
};

static __net_init int vlan_init_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, vlan_net_id);

	return tc_action_net_init(tn, &act_vlan_ops);
}

static void __net_exit vlan_exit_net(struct list_head *net_list)
{
	tc_action_net_exit(net_list, vlan_net_id);
}

static struct pernet_operations vlan_net_ops = {
	.init = vlan_init_net,
	.exit_batch = vlan_exit_net,
	.id   = &vlan_net_id,
	.size = sizeof(struct tc_action_net),
};

static int __init vlan_init_module(void)
{
	return tcf_register_action(&act_vlan_ops, &vlan_net_ops);
}

static void __exit vlan_cleanup_module(void)
{
	tcf_unregister_action(&act_vlan_ops, &vlan_net_ops);
}

module_init(vlan_init_module);
module_exit(vlan_cleanup_module);

MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
MODULE_DESCRIPTION("vlan manipulation actions");
MODULE_LICENSE("GPL v2");