summaryrefslogtreecommitdiff
path: root/net/netfilter/ipset/ip_set_bitmap_gen.h
blob: 38ef2ea838cbfada1b997af032d55d4e3e504ca6 (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
/* Copyright (C) 2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef __IP_SET_BITMAP_IP_GEN_H
#define __IP_SET_BITMAP_IP_GEN_H

#define mtype_do_test		IPSET_TOKEN(MTYPE, _do_test)
#define mtype_gc_test		IPSET_TOKEN(MTYPE, _gc_test)
#define mtype_is_filled		IPSET_TOKEN(MTYPE, _is_filled)
#define mtype_do_add		IPSET_TOKEN(MTYPE, _do_add)
#define mtype_ext_cleanup	IPSET_TOKEN(MTYPE, _ext_cleanup)
#define mtype_do_del		IPSET_TOKEN(MTYPE, _do_del)
#define mtype_do_list		IPSET_TOKEN(MTYPE, _do_list)
#define mtype_do_head		IPSET_TOKEN(MTYPE, _do_head)
#define mtype_adt_elem		IPSET_TOKEN(MTYPE, _adt_elem)
#define mtype_add_timeout	IPSET_TOKEN(MTYPE, _add_timeout)
#define mtype_gc_init		IPSET_TOKEN(MTYPE, _gc_init)
#define mtype_kadt		IPSET_TOKEN(MTYPE, _kadt)
#define mtype_uadt		IPSET_TOKEN(MTYPE, _uadt)
#define mtype_destroy		IPSET_TOKEN(MTYPE, _destroy)
#define mtype_memsize		IPSET_TOKEN(MTYPE, _memsize)
#define mtype_flush		IPSET_TOKEN(MTYPE, _flush)
#define mtype_head		IPSET_TOKEN(MTYPE, _head)
#define mtype_same_set		IPSET_TOKEN(MTYPE, _same_set)
#define mtype_elem		IPSET_TOKEN(MTYPE, _elem)
#define mtype_test		IPSET_TOKEN(MTYPE, _test)
#define mtype_add		IPSET_TOKEN(MTYPE, _add)
#define mtype_del		IPSET_TOKEN(MTYPE, _del)
#define mtype_list		IPSET_TOKEN(MTYPE, _list)
#define mtype_gc		IPSET_TOKEN(MTYPE, _gc)
#define mtype			MTYPE

#define get_ext(set, map, id)	((map)->extensions + ((set)->dsize * (id)))

static void
mtype_gc_init(struct ip_set *set, void (*gc)(struct timer_list *t))
{
	struct mtype *map = set->data;

	timer_setup(&map->gc, gc, 0);
	mod_timer(&map->gc, jiffies + IPSET_GC_PERIOD(set->timeout) * HZ);
}

static void
mtype_ext_cleanup(struct ip_set *set)
{
	struct mtype *map = set->data;
	u32 id;

	for (id = 0; id < map->elements; id++)
		if (test_bit(id, map->members))
			ip_set_ext_destroy(set, get_ext(set, map, id));
}

static void
mtype_destroy(struct ip_set *set)
{
	struct mtype *map = set->data;

	if (SET_WITH_TIMEOUT(set))
		del_timer_sync(&map->gc);

	ip_set_free(map->members);
	if (set->dsize && set->extensions & IPSET_EXT_DESTROY)
		mtype_ext_cleanup(set);
	ip_set_free(map);

	set->data = NULL;
}

static void
mtype_flush(struct ip_set *set)
{
	struct mtype *map = set->data;

	if (set->extensions & IPSET_EXT_DESTROY)
		mtype_ext_cleanup(set);
	memset(map->members, 0, map->memsize);
	set->elements = 0;
	set->ext_size = 0;
}

/* Calculate the actual memory size of the set data */
static size_t
mtype_memsize(const struct mtype *map, size_t dsize)
{
	return sizeof(*map) + map->memsize +
	       map->elements * dsize;
}

static int
mtype_head(struct ip_set *set, struct sk_buff *skb)
{
	const struct mtype *map = set->data;
	struct nlattr *nested;
	size_t memsize = mtype_memsize(map, set->dsize) + set->ext_size;

	nested = nla_nest_start(skb, IPSET_ATTR_DATA);
	if (!nested)
		goto nla_put_failure;
	if (mtype_do_head(skb, map) ||
	    nla_put_net32(skb, IPSET_ATTR_REFERENCES, htonl(set->ref)) ||
	    nla_put_net32(skb, IPSET_ATTR_MEMSIZE, htonl(memsize)) ||
	    nla_put_net32(skb, IPSET_ATTR_ELEMENTS, htonl(set->elements)))
		goto nla_put_failure;
	if (unlikely(ip_set_put_flags(skb, set)))
		goto nla_put_failure;
	nla_nest_end(skb, nested);

	return 0;
nla_put_failure:
	return -EMSGSIZE;
}

static int
mtype_test(struct ip_set *set, void *value, const struct ip_set_ext *ext,
	   struct ip_set_ext *mext, u32 flags)
{
	struct mtype *map = set->data;
	const struct mtype_adt_elem *e = value;
	void *x = get_ext(set, map, e->id);
	int ret = mtype_do_test(e, map, set->dsize);

	if (ret <= 0)
		return ret;
	return ip_set_match_extensions(set, ext, mext, flags, x);
}

static int
mtype_add(struct ip_set *set, void *value, const struct ip_set_ext *ext,
	  struct ip_set_ext *mext, u32 flags)
{
	struct mtype *map = set->data;
	const struct mtype_adt_elem *e = value;
	void *x = get_ext(set, map, e->id);
	int ret = mtype_do_add(e, map, flags, set->dsize);

	if (ret == IPSET_ADD_FAILED) {
		if (SET_WITH_TIMEOUT(set) &&
		    ip_set_timeout_expired(ext_timeout(x, set))) {
			set->elements--;
			ret = 0;
		} else if (!(flags & IPSET_FLAG_EXIST)) {
			set_bit(e->id, map->members);
			return -IPSET_ERR_EXIST;
		}
		/* Element is re-added, cleanup extensions */
		ip_set_ext_destroy(set, x);
	}
	if (ret > 0)
		set->elements--;

	if (SET_WITH_TIMEOUT(set))
#ifdef IP_SET_BITMAP_STORED_TIMEOUT
		mtype_add_timeout(ext_timeout(x, set), e, ext, set, map, ret);
#else
		ip_set_timeout_set(ext_timeout(x, set), ext->timeout);
#endif

	if (SET_WITH_COUNTER(set))
		ip_set_init_counter(ext_counter(x, set), ext);
	if (SET_WITH_COMMENT(set))
		ip_set_init_comment(set, ext_comment(x, set), ext);
	if (SET_WITH_SKBINFO(set))
		ip_set_init_skbinfo(ext_skbinfo(x, set), ext);

	/* Activate element */
	set_bit(e->id, map->members);
	set->elements++;

	return 0;
}

static int
mtype_del(struct ip_set *set, void *value, const struct ip_set_ext *ext,
	  struct ip_set_ext *mext, u32 flags)
{
	struct mtype *map = set->data;
	const struct mtype_adt_elem *e = value;
	void *x = get_ext(set, map, e->id);

	if (mtype_do_del(e, map))
		return -IPSET_ERR_EXIST;

	ip_set_ext_destroy(set, x);
	set->elements--;
	if (SET_WITH_TIMEOUT(set) &&
	    ip_set_timeout_expired(ext_timeout(x, set)))
		return -IPSET_ERR_EXIST;

	return 0;
}

#ifndef IP_SET_BITMAP_STORED_TIMEOUT
static inline bool
mtype_is_filled(const struct mtype_elem *x)
{
	return true;
}
#endif

static int
mtype_list(const struct ip_set *set,
	   struct sk_buff *skb, struct netlink_callback *cb)
{
	struct mtype *map = set->data;
	struct nlattr *adt, *nested;
	void *x;
	u32 id, first = cb->args[IPSET_CB_ARG0];
	int ret = 0;

	adt = nla_nest_start(skb, IPSET_ATTR_ADT);
	if (!adt)
		return -EMSGSIZE;
	/* Extensions may be replaced */
	rcu_read_lock();
	for (; cb->args[IPSET_CB_ARG0] < map->elements;
	     cb->args[IPSET_CB_ARG0]++) {
		cond_resched_rcu();
		id = cb->args[IPSET_CB_ARG0];
		x = get_ext(set, map, id);
		if (!test_bit(id, map->members) ||
		    (SET_WITH_TIMEOUT(set) &&
#ifdef IP_SET_BITMAP_STORED_TIMEOUT
		     mtype_is_filled(x) &&
#endif
		     ip_set_timeout_expired(ext_timeout(x, set))))
			continue;
		nested = nla_nest_start(skb, IPSET_ATTR_DATA);
		if (!nested) {
			if (id == first) {
				nla_nest_cancel(skb, adt);
				ret = -EMSGSIZE;
				goto out;
			}

			goto nla_put_failure;
		}
		if (mtype_do_list(skb, map, id, set->dsize))
			goto nla_put_failure;
		if (ip_set_put_extensions(skb, set, x, mtype_is_filled(x)))
			goto nla_put_failure;
		nla_nest_end(skb, nested);
	}
	nla_nest_end(skb, adt);

	/* Set listing finished */
	cb->args[IPSET_CB_ARG0] = 0;

	goto out;

nla_put_failure:
	nla_nest_cancel(skb, nested);
	if (unlikely(id == first)) {
		cb->args[IPSET_CB_ARG0] = 0;
		ret = -EMSGSIZE;
	}
	nla_nest_end(skb, adt);
out:
	rcu_read_unlock();
	return ret;
}

static void
mtype_gc(struct timer_list *t)
{
	struct mtype *map = from_timer(map, t, gc);
	struct ip_set *set = map->set;
	void *x;
	u32 id;

	/* We run parallel with other readers (test element)
	 * but adding/deleting new entries is locked out
	 */
	spin_lock_bh(&set->lock);
	for (id = 0; id < map->elements; id++)
		if (mtype_gc_test(id, map, set->dsize)) {
			x = get_ext(set, map, id);
			if (ip_set_timeout_expired(ext_timeout(x, set))) {
				clear_bit(id, map->members);
				ip_set_ext_destroy(set, x);
				set->elements--;
			}
		}
	spin_unlock_bh(&set->lock);

	map->gc.expires = jiffies + IPSET_GC_PERIOD(set->timeout) * HZ;
	add_timer(&map->gc);
}

static const struct ip_set_type_variant mtype = {
	.kadt	= mtype_kadt,
	.uadt	= mtype_uadt,
	.adt	= {
		[IPSET_ADD] = mtype_add,
		[IPSET_DEL] = mtype_del,
		[IPSET_TEST] = mtype_test,
	},
	.destroy = mtype_destroy,
	.flush	= mtype_flush,
	.head	= mtype_head,
	.list	= mtype_list,
	.same_set = mtype_same_set,
};

#endif /* __IP_SET_BITMAP_IP_GEN_H */