summaryrefslogtreecommitdiffstats
path: root/kernel/net/netfilter/ipset/ip_set_hash_ip.c
blob: dd40607f878e28e8c5c411a24fb8e36ef7db5d46 (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
/* 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 hash:ip type */

#include <linux/jhash.h>
#include <linux/module.h>
#include <linux/ip.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <linux/random.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/netlink.h>
#include <net/tcp.h>

#include <linux/netfilter.h>
#include <linux/netfilter/ipset/pfxlen.h>
#include <linux/netfilter/ipset/ip_set.h>
#include <linux/netfilter/ipset/ip_set_hash.h>

#define IPSET_TYPE_REV_MIN	0
/*				1	   Counters support */
/*				2	   Comments support */
#define IPSET_TYPE_REV_MAX	3	/* Forceadd support */

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
IP_SET_MODULE_DESC("hash:ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
MODULE_ALIAS("ip_set_hash:ip");

/* Type specific function prefix */
#define HTYPE		hash_ip
#define IP_SET_HASH_WITH_NETMASK

/* IPv4 variant */

/* Member elements */
struct hash_ip4_elem {
	/* Zero valued IP addresses cannot be stored */
	__be32 ip;
};

/* Common functions */

static inline bool
hash_ip4_data_equal(const struct hash_ip4_elem *e1,
		    const struct hash_ip4_elem *e2,
		    u32 *multi)
{
	return e1->ip == e2->ip;
}

static inline bool
hash_ip4_data_list(struct sk_buff *skb, const struct hash_ip4_elem *e)
{
	if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, e->ip))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return 1;
}

static inline void
hash_ip4_data_next(struct hash_ip4_elem *next, const struct hash_ip4_elem *e)
{
	next->ip = e->ip;
}

#define MTYPE		hash_ip4
#define PF		4
#define HOST_MASK	32
#include "ip_set_hash_gen.h"

static int
hash_ip4_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)
{
	const struct hash_ip *h = set->data;
	ipset_adtfn adtfn = set->variant->adt[adt];
	struct hash_ip4_elem e = {};
	struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
	__be32 ip;

	ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &ip);
	ip &= ip_set_netmask(h->netmask);
	if (ip == 0)
		return -EINVAL;

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

static int
hash_ip4_uadt(struct ip_set *set, struct nlattr *tb[],
	      enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
{
	const struct hash_ip *h = set->data;
	ipset_adtfn adtfn = set->variant->adt[adt];
	struct hash_ip4_elem e = {};
	struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
	u32 ip = 0, ip_to = 0, hosts;
	int ret = 0;

	if (unlikely(!tb[IPSET_ATTR_IP] ||
		     !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]);

	ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip) ||
	      ip_set_get_extensions(set, tb, &ext);
	if (ret)
		return ret;

	ip &= ip_set_hostmask(h->netmask);

	if (adt == IPSET_TEST) {
		e.ip = htonl(ip);
		if (e.ip == 0)
			return -IPSET_ERR_HASH_ELEM;
		return adtfn(set, &e, &ext, &ext, flags);
	}

	ip_to = ip;
	if (tb[IPSET_ATTR_IP_TO]) {
		ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
		if (ret)
			return ret;
		if (ip > ip_to)
			swap(ip, ip_to);
	} else if (tb[IPSET_ATTR_CIDR]) {
		u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);

		if (!cidr || cidr > 32)
			return -IPSET_ERR_INVALID_CIDR;
		ip_set_mask_from_to(ip, ip_to, cidr);
	}

	hosts = h->netmask == 32 ? 1 : 2 << (32 - h->netmask - 1);

	if (retried)
		ip = ntohl(h->next.ip);
	for (; !before(ip_to, ip); ip += hosts) {
		e.ip = htonl(ip);
		if (e.ip == 0)
			return -IPSET_ERR_HASH_ELEM;
		ret = adtfn(set, &e, &ext, &ext, flags);

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

/* IPv6 variant */

/* Member elements */
struct hash_ip6_elem {
	union nf_inet_addr ip;
};

/* Common functions */

static inline bool
hash_ip6_data_equal(const struct hash_ip6_elem *ip1,
		    const struct hash_ip6_elem *ip2,
		    u32 *multi)
{
	return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6);
}

static inline void
hash_ip6_netmask(union nf_inet_addr *ip, u8 prefix)
{
	ip6_netmask(ip, prefix);
}

static bool
hash_ip6_data_list(struct sk_buff *skb, const struct hash_ip6_elem *e)
{
	if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return 1;
}

static inline void
hash_ip6_data_next(struct hash_ip4_elem *next, const struct hash_ip6_elem *e)
{
}

#undef MTYPE
#undef PF
#undef HOST_MASK
#undef HKEY_DATALEN

#define MTYPE		hash_ip6
#define PF		6
#define HOST_MASK	128

#define IP_SET_EMIT_CREATE
#include "ip_set_hash_gen.h"

static int
hash_ip6_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)
{
	const struct hash_ip *h = set->data;
	ipset_adtfn adtfn = set->variant->adt[adt];
	struct hash_ip6_elem e = {};
	struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);

	ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
	hash_ip6_netmask(&e.ip, h->netmask);
	if (ipv6_addr_any(&e.ip.in6))
		return -EINVAL;

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

static int
hash_ip6_uadt(struct ip_set *set, struct nlattr *tb[],
	      enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
{
	const struct hash_ip *h = set->data;
	ipset_adtfn adtfn = set->variant->adt[adt];
	struct hash_ip6_elem e = {};
	struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
	int ret;

	if (unlikely(!tb[IPSET_ATTR_IP] ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
		     tb[IPSET_ATTR_IP_TO] ||
		     tb[IPSET_ATTR_CIDR]))
		return -IPSET_ERR_PROTOCOL;

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

	ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) ||
	      ip_set_get_extensions(set, tb, &ext);
	if (ret)
		return ret;

	hash_ip6_netmask(&e.ip, h->netmask);
	if (ipv6_addr_any(&e.ip.in6))
		return -IPSET_ERR_HASH_ELEM;

	ret = adtfn(set, &e, &ext, &ext, flags);

	return ip_set_eexist(ret, flags) ? 0 : ret;
}

static struct ip_set_type hash_ip_type __read_mostly = {
	.name		= "hash:ip",
	.protocol	= IPSET_PROTOCOL,
	.features	= IPSET_TYPE_IP,
	.dimension	= IPSET_DIM_ONE,
	.family		= NFPROTO_UNSPEC,
	.revision_min	= IPSET_TYPE_REV_MIN,
	.revision_max	= IPSET_TYPE_REV_MAX,
	.create		= hash_ip_create,
	.create_policy	= {
		[IPSET_ATTR_HASHSIZE]	= { .type = NLA_U32 },
		[IPSET_ATTR_MAXELEM]	= { .type = NLA_U32 },
		[IPSET_ATTR_PROBES]	= { .type = NLA_U8 },
		[IPSET_ATTR_RESIZE]	= { .type = NLA_U8  },
		[IPSET_ATTR_TIMEOUT]	= { .type = NLA_U32 },
		[IPSET_ATTR_NETMASK]	= { .type = NLA_U8  },
		[IPSET_ATTR_CADT_FLAGS]	= { .type = NLA_U32 },
	},
	.adt_policy	= {
		[IPSET_ATTR_IP]		= { .type = NLA_NESTED },
		[IPSET_ATTR_IP_TO]	= { .type = NLA_NESTED },
		[IPSET_ATTR_CIDR]	= { .type = NLA_U8 },
		[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
hash_ip_init(void)
{
	return ip_set_type_register(&hash_ip_type);
}

static void __exit
hash_ip_fini(void)
{
	ip_set_type_unregister(&hash_ip_type);
}

module_init(hash_ip_init);
module_exit(hash_ip_fini);