summaryrefslogtreecommitdiffstats
path: root/kernel/net/netfilter/ipset/ip_set_bitmap_port.c
blob: a4b65ae1986c5a1a3b52a788e2b3378d301859fa (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
/* Copyright (C) 2003-2013 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.
 */

/* Kernel module implementing an IP set type: the bitmap:port type */

#include <linux/module.h>
#include <linux/ip.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <linux/netlink.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
#include <net/netlink.h>

#include <linux/netfilter/ipset/ip_set.h>
#include <linux/netfilter/ipset/ip_set_bitmap.h>
#include <linux/netfilter/ipset/ip_set_getport.h>

#define IPSET_TYPE_REV_MIN	0
/*				1	   Counter support added */
#define IPSET_TYPE_REV_MAX	2	/* Comment support added */

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
IP_SET_MODULE_DESC("bitmap:port", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
MODULE_ALIAS("ip_set_bitmap:port");

#define MTYPE		bitmap_port

/* Type structure */
struct bitmap_port {
	void *members;		/* the set members */
	void *extensions;	/* data extensions */
	u16 first_port;		/* host byte order, included in range */
	u16 last_port;		/* host byte order, included in range */
	u32 elements;		/* number of max elements in the set */
	size_t memsize;		/* members size */
	struct timer_list gc;	/* garbage collection */
};

/* ADT structure for generic function args */
struct bitmap_port_adt_elem {
	u16 id;
};

static inline u16
port_to_id(const struct bitmap_port *m, u16 port)
{
	return port - m->first_port;
}

/* Common functions */

static inline int
bitmap_port_do_test(const struct bitmap_port_adt_elem *e,
		    const struct bitmap_port *map, size_t dsize)
{
	return !!test_bit(e->id, map->members);
}

static inline int
bitmap_port_gc_test(u16 id, const struct bitmap_port *map, size_t dsize)
{
	return !!test_bit(id, map->members);
}

static inline int
bitmap_port_do_add(const struct bitmap_port_adt_elem *e,
		   struct bitmap_port *map, u32 flags, size_t dsize)
{
	return !!test_and_set_bit(e->id, map->members);
}

static inline int
bitmap_port_do_del(const struct bitmap_port_adt_elem *e,
		   struct bitmap_port *map)
{
	return !test_and_clear_bit(e->id, map->members);
}

static inline int
bitmap_port_do_list(struct sk_buff *skb, const struct bitmap_port *map, u32 id,
		    size_t dsize)
{
	return nla_put_net16(skb, IPSET_ATTR_PORT,
			     htons(map->first_port + id));
}

static inline int
bitmap_port_do_head(struct sk_buff *skb, const struct bitmap_port *map)
{
	return nla_put_net16(skb, IPSET_ATTR_PORT, htons(map->first_port)) ||
	       nla_put_net16(skb, IPSET_ATTR_PORT_TO, htons(map->last_port));
}

static int
bitmap_port_kadt(struct ip_set *set, const struct sk_buff *skb,
		 const struct xt_action_param *par,
		 enum ipset_adt adt, struct ip_set_adt_opt *opt)
{
	struct bitmap_port *map = set->data;
	ipset_adtfn adtfn = set->variant->adt[adt];
	struct bitmap_port_adt_elem e = { .id = 0 };
	struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
	__be16 __port;
	u16 port = 0;

	if (!ip_set_get_ip_port(skb, opt->family,
				opt->flags & IPSET_DIM_ONE_SRC, &__port))
		return -EINVAL;

	port = ntohs(__port);

	if (port < map->first_port || port > map->last_port)
		return -IPSET_ERR_BITMAP_RANGE;

	e.id = port_to_id(map, port);

	return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
}

static int
bitmap_port_uadt(struct ip_set *set, struct nlattr *tb[],
		 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
{
	struct bitmap_port *map = set->data;
	ipset_adtfn adtfn = set->variant->adt[adt];
	struct bitmap_port_adt_elem e = { .id = 0 };
	struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
	u32 port;	/* wraparound */
	u16 port_to;
	int ret = 0;

	if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
		return -IPSET_ERR_PROTOCOL;

	if (tb[IPSET_ATTR_LINENO])
		*lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);

	port = ip_set_get_h16(tb[IPSET_ATTR_PORT]);
	if (port < map->first_port || port > map->last_port)
		return -IPSET_ERR_BITMAP_RANGE;
	ret = ip_set_get_extensions(set, tb, &ext);
	if (ret)
		return ret;

	if (adt == IPSET_TEST) {
		e.id = port_to_id(map, port);
		return adtfn(set, &e, &ext, &ext, flags);
	}

	if (tb[IPSET_ATTR_PORT_TO]) {
		port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
		if (port > port_to) {
			swap(port, port_to);
			if (port < map->first_port)
				return -IPSET_ERR_BITMAP_RANGE;
		}
	} else
		port_to = port;

	if (port_to > map->last_port)
		return -IPSET_ERR_BITMAP_RANGE;

	for (; port <= port_to; port++) {
		e.id = port_to_id(map, port);
		ret = adtfn(set, &e, &ext, &ext, flags);

		if (ret && !ip_set_eexist(ret, flags))
			return ret;
		else
			ret = 0;
	}
	return ret;
}

static bool
bitmap_port_same_set(const struct ip_set *a, const struct ip_set *b)
{
	const struct bitmap_port *x = a->data;
	const struct bitmap_port *y = b->data;

	return x->first_port == y->first_port &&
	       x->last_port == y->last_port &&
	       a->timeout == b->timeout &&
	       a->extensions == b->extensions;
}

/* Plain variant */

struct bitmap_port_elem {
};

#include "ip_set_bitmap_gen.h"

/* Create bitmap:ip type of sets */

static bool
init_map_port(struct ip_set *set, struct bitmap_port *map,
	      u16 first_port, u16 last_port)
{
	map->members = ip_set_alloc(map->memsize);
	if (!map->members)
		return false;
	if (set->dsize) {
		map->extensions = ip_set_alloc(set->dsize * map->elements);
		if (!map->extensions) {
			kfree(map->members);
			return false;
		}
	}
	map->first_port = first_port;
	map->last_port = last_port;
	set->timeout = IPSET_NO_TIMEOUT;

	set->data = map;
	set->family = NFPROTO_UNSPEC;

	return true;
}

static int
bitmap_port_create(struct net *net, struct ip_set *set, struct nlattr *tb[],
		   u32 flags)
{
	struct bitmap_port *map;
	u16 first_port, last_port;

	if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
		     !ip_set_attr_netorder(tb, IPSET_ATTR_PORT_TO) ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
		return -IPSET_ERR_PROTOCOL;

	first_port = ip_set_get_h16(tb[IPSET_ATTR_PORT]);
	last_port = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
	if (first_port > last_port) {
		u16 tmp = first_port;

		first_port = last_port;
		last_port = tmp;
	}

	map = kzalloc(sizeof(*map), GFP_KERNEL);
	if (!map)
		return -ENOMEM;

	map->elements = last_port - first_port + 1;
	map->memsize = bitmap_bytes(0, map->elements);
	set->variant = &bitmap_port;
	set->dsize = ip_set_elem_len(set, tb, 0);
	if (!init_map_port(set, map, first_port, last_port)) {
		kfree(map);
		return -ENOMEM;
	}
	if (tb[IPSET_ATTR_TIMEOUT]) {
		set->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
		bitmap_port_gc_init(set, bitmap_port_gc);
	}
	return 0;
}

static struct ip_set_type bitmap_port_type = {
	.name		= "bitmap:port",
	.protocol	= IPSET_PROTOCOL,
	.features	= IPSET_TYPE_PORT,
	.dimension	= IPSET_DIM_ONE,
	.family		= NFPROTO_UNSPEC,
	.revision_min	= IPSET_TYPE_REV_MIN,
	.revision_max	= IPSET_TYPE_REV_MAX,
	.create		= bitmap_port_create,
	.create_policy	= {
		[IPSET_ATTR_PORT]	= { .type = NLA_U16 },
		[IPSET_ATTR_PORT_TO]	= { .type = NLA_U16 },
		[IPSET_ATTR_TIMEOUT]	= { .type = NLA_U32 },
		[IPSET_ATTR_CADT_FLAGS]	= { .type = NLA_U32 },
	},
	.adt_policy	= {
		[IPSET_ATTR_PORT]	= { .type = NLA_U16 },
		[IPSET_ATTR_PORT_TO]	= { .type = NLA_U16 },
		[IPSET_ATTR_TIMEOUT]	= { .type = NLA_U32 },
		[IPSET_ATTR_LINENO]	= { .type = NLA_U32 },
		[IPSET_ATTR_BYTES]	= { .type = NLA_U64 },
		[IPSET_ATTR_PACKETS]	= { .type = NLA_U64 },
		[IPSET_ATTR_COMMENT]	= { .type = NLA_NUL_STRING },
	},
	.me		= THIS_MODULE,
};

static int __init
bitmap_port_init(void)
{
	return ip_set_type_register(&bitmap_port_type);
}

static void __exit
bitmap_port_fini(void)
{
	ip_set_type_unregister(&bitmap_port_type);
}

module_init(bitmap_port_init);
module_exit(bitmap_port_fini);