summaryrefslogtreecommitdiffstats
path: root/kernel/include/linux/netfilter/ip_set.h
blob: d0b47a0a620be5f5a1539b9419318981b6050383 (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
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
#ifndef _IP_SET_H
#define _IP_SET_H

/* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
 *                         Patrick Schaaf <bof@bof.de>
 *                         Martin Josefsson <gandalf@wlug.westbo.se>
 * Copyright (C) 2003-2010 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.  
 */

#if 1
#define IP_SET_DEBUG
#endif

/* The protocol version */
#define IPSET_PROTOCOL		5

/* The max length of strings: set and type identifiers */
#define IPSET_MAXNAMELEN	32

/* Message types and commands */
enum ipset_cmd {
	IPSET_CMD_NONE,
	IPSET_CMD_CREATE,	/* Create a new (empty) set */
	IPSET_CMD_DESTROY,	/* Remove a (empty) set */
	IPSET_CMD_FLUSH,	/* Remove all elements from a set */
	IPSET_CMD_RENAME,	/* Rename a set */
	IPSET_CMD_SWAP,		/* Swap two sets */
	IPSET_CMD_LIST,		/* List sets */
	IPSET_CMD_SAVE,		/* Save sets */
	IPSET_CMD_ADD,		/* Add an element to a set */
	IPSET_CMD_DEL,		/* Delete an element from a set */
	IPSET_CMD_TEST,		/* Test an element in a set */
	IPSET_CMD_HEADER,	/* Get set header data only */
	IPSET_CMD_TYPE,		/* Get set type */
	IPSET_CMD_PROTOCOL,	/* Return protocol version */
	IPSET_MSG_MAX,		/* Netlink message commands */

	/* Commands in userspace: */
	IPSET_CMD_RESTORE = IPSET_MSG_MAX, /* Enter restore mode */	
	IPSET_CMD_HELP,		/* Get help */
	IPSET_CMD_VERSION,	/* Get program version */

	IPSET_CMD_MAX,

	IPSET_CMD_COMMIT = IPSET_CMD_MAX, /* Commit buffered commands */
};

/* Attributes at command level */
enum {
	IPSET_ATTR_UNSPEC,
	IPSET_ATTR_PROTOCOL,	/* Protocol version */
	IPSET_ATTR_SETNAME,	/* Name of the set */
	IPSET_ATTR_TYPENAME,	/* Typename */
	IPSET_ATTR_SETNAME2 = IPSET_ATTR_TYPENAME, /* rename/swap */
	IPSET_ATTR_REVISION,	/* Settype revision */
	IPSET_ATTR_FAMILY,	/* Settype family */
	IPSET_ATTR_DATA,	/* Nested attributes */
	IPSET_ATTR_ADT,		/* Multiple data containers */
	IPSET_ATTR_LINENO,	/* Restore lineno */
	IPSET_ATTR_PROTOCOL_MIN,/* Minimal supported version number */
	IPSET_ATTR_REVISION_MIN = IPSET_ATTR_PROTOCOL_MIN, /* type rev min */
	__IPSET_ATTR_CMD_MAX,
};
#define IPSET_ATTR_CMD_MAX	(__IPSET_ATTR_CMD_MAX - 1)

/* CADT specific attributes */
enum {
	IPSET_ATTR_IP = IPSET_ATTR_UNSPEC + 1,
	IPSET_ATTR_IP_FROM = IPSET_ATTR_IP,
	IPSET_ATTR_IP_TO,
	IPSET_ATTR_CIDR,
	IPSET_ATTR_PORT,
	IPSET_ATTR_PORT_FROM = IPSET_ATTR_PORT,
	IPSET_ATTR_PORT_TO,
	IPSET_ATTR_TIMEOUT,
	IPSET_ATTR_FLAGS,
	/* IPSET_ATTR_LINENO */
	/* Reserve empty slots */
	IPSET_ATTR_CADT_MAX = 16,
	/* Create-only specific attributes */
	IPSET_ATTR_GC,
	IPSET_ATTR_HASHSIZE,
	IPSET_ATTR_MAXELEM,
	IPSET_ATTR_NETMASK,
	IPSET_ATTR_PROBES,
	IPSET_ATTR_RESIZE,
	IPSET_ATTR_SIZE,
	/* Kernel-only */
	IPSET_ATTR_ELEMENTS,
	IPSET_ATTR_REFERENCES,
	IPSET_ATTR_MEMSIZE,
	
	__IPSET_ATTR_CREATE_MAX,
};
#define IPSET_ATTR_CREATE_MAX	(__IPSET_ATTR_CREATE_MAX - 1)

/* ADT specific attributes */
enum {
	IPSET_ATTR_ETHER = IPSET_ATTR_CADT_MAX + 1,
	IPSET_ATTR_NAME,
	IPSET_ATTR_NAMEREF,
	IPSET_ATTR_IP2,
	IPSET_ATTR_CIDR2,
	__IPSET_ATTR_ADT_MAX,
};
#define IPSET_ATTR_ADT_MAX	(__IPSET_ATTR_ADT_MAX - 1)

/* Error codes */
enum ipset_errno {
	IPSET_ERR_PRIVATE = 128,
	IPSET_ERR_PROTOCOL,
	IPSET_ERR_FIND_TYPE,
	IPSET_ERR_MAX_SETS,
	IPSET_ERR_BUSY,
	IPSET_ERR_EXIST_SETNAME2,
	IPSET_ERR_TYPE_MISMATCH,
	IPSET_ERR_EXIST,
	IPSET_ERR_INVALID_CIDR,
	IPSET_ERR_INVALID_NETMASK,
	IPSET_ERR_INVALID_FAMILY,
	IPSET_ERR_TIMEOUT,

	IPSET_ERR_TYPE_SPECIFIC = 160,
};
	                                
enum ipset_data_flags {
	IPSET_FLAG_BIT_EXIST	= 0,
	IPSET_FLAG_EXIST	= (1 << IPSET_FLAG_BIT_EXIST),
	
	IPSET_FLAG_BIT_BEFORE	= 2,
	IPSET_FLAG_BEFORE	= (1 << IPSET_FLAG_BIT_BEFORE),
};

/* Commands with settype-specific attributes */
enum ipset_adt {
	IPSET_ADD,
	IPSET_DEL,
	IPSET_TEST,
	IPSET_CREATE,
	IPSET_CADT_MAX,
};

#ifndef __KERNEL__
#ifdef IP_SET_DEBUG
#include <stdio.h>
#include <sys/socket.h>
#include <linux/netlink.h>
#define D(format, args...)	do {				\
	fprintf(stderr, "%s: %s: ", __FILE__, __FUNCTION__);	\
	fprintf(stderr, format "\n" , ## args);			\
} while (0)
static inline void
dump_nla(struct  nlattr *nla[], int maxlen)
{
	int i;
	
	for (i = 0; i < maxlen; i++)
		D("nla[%u] does%s exist", i, !nla[i] ? " NOT" : "");
}

#else
#define D(format, args...)
#define dump_nla(nla, maxlen)
#endif
#endif /* !__KERNEL__ */

#ifdef __KERNEL__
#include <linux/ipv6.h>
#include <linux/netlink.h>
#include <net/netlink.h>

/* Sets are identified by an index in kernel space. Tweak with ip_set_id_t
 * and IPSET_INVALID_ID if you want to increase the max number of sets.
 */
typedef uint16_t ip_set_id_t;

#define IPSET_INVALID_ID		65535

/* Option flags for kernel operations */
enum ip_set_kopt {
	/* Bit 0 is reserved */
	IPSET_SRC_FLAG = 1,
	IPSET_SRC = (1 << IPSET_SRC_FLAG),
	IPSET_DST_FLAG = 2,
	IPSET_DST = (1 << IPSET_DST_FLAG),
	IPSET_INV_FLAG = 3,
	IPSET_INV = (1 << IPSET_INV_FLAG),
};

/* Set features */
enum ip_set_feature {
	IPSET_TYPE_IP_FLAG = 0,
	IPSET_TYPE_IP = (1 << IPSET_TYPE_IP_FLAG),
	IPSET_TYPE_PORT_FLAG = 1,
	IPSET_TYPE_PORT = (1 << IPSET_TYPE_PORT_FLAG),
	IPSET_TYPE_MAC_FLAG = 2,
	IPSET_TYPE_MAC = (1 << IPSET_TYPE_MAC_FLAG),
	IPSET_TYPE_IP2_FLAG = 3,
	IPSET_TYPE_IP2 = (1 << IPSET_TYPE_IP2_FLAG),
	IPSET_TYPE_NAME_FLAG = 4,
	IPSET_TYPE_NAME = (1 << IPSET_TYPE_NAME_FLAG),
};

static inline int
bitmap_bytes(uint32_t a, uint32_t b)
{
	return 4 * ((((b - a + 8) / 8) + 3) / 4);
}

#define ip_set_printk(format, args...) 				\
	do {							\
		printk("%s: %s: ", __FILE__, __FUNCTION__);	\
		printk(format "\n" , ## args);			\
	} while (0)

#if defined(IP_SET_DEBUG)
#define D(format, args...) 					\
	do {							\
		printk("%s: %s (DBG): ", __FILE__, __FUNCTION__);\
		printk(format "\n" , ## args);			\
	} while (0)

static inline void
dump_nla(const struct nlattr * const nla[], int maxlen)
{
	int i;
	
	for (i = 0; i < maxlen; i++)
		printk("nlattr[%u] does%s exist\n", i, nla[i] ? "" : " NOT");
}
#else
#define D(format, args...)
#define dump_nla(nla, maxlen)
#endif

struct ip_set;

/* Set type, variant-specific part */
struct ip_set_type_variant {
	/* Kernelspace: test/add/del entries */
	int (*kadt)(struct ip_set *set, const struct sk_buff * skb,
		    enum ipset_adt adt, uint8_t pf, const uint8_t *flags);

	/* Userspace: test/add/del entries */
	int (*uadt)(struct ip_set *set, struct nlattr *head, int len,
		    enum ipset_adt adt, uint32_t *lineno, uint32_t flags);

	/* When adding entries and set is full, try to resize the set */
	int (*resize)(struct ip_set *set, uint8_t retried);
	/* Destroy the set */
	void (*destroy)(struct ip_set *set);
	/* Flush the elements */
	void (*flush)(struct ip_set *set);

	/* List set header data */
	int (*head)(struct ip_set *set, struct sk_buff *skb);
	/* List elements */
	int (*list)(struct ip_set *set, struct sk_buff *skb,
		    struct netlink_callback *cb);
};

/* Flags for the set type variants */
enum ip_set_type_flags {
	IP_SET_FLAG_VMALLOC_BIT = 0,
	IP_SET_FLAG_VMALLOC = (1 << IP_SET_FLAG_VMALLOC_BIT),
	IP_SET_FLAG_TIMEOUT_BIT = 1,
	IP_SET_FLAG_TIMEOUT = (1 << IP_SET_FLAG_TIMEOUT_BIT),
};

/* The core set type structure */
struct ip_set_type {
	struct list_head list;

	/* Typename */
	char name[IPSET_MAXNAMELEN];
	/* Protocol version */
	uint8_t protocol;
	/* Set features to control swapping */
	uint8_t features;
	/* Supported family: may be AF_UNSPEC for both AF_INET/AF_INET6 */
	uint8_t family;
	/* Type revision */
	uint8_t revision;

	/* Create set */
	int (*create)(struct ip_set *set,
		      struct nlattr *head, int len, uint32_t flags);

	/* Set this to THIS_MODULE if you are a module, otherwise NULL */
	struct module *me;
};

extern int ip_set_type_register(struct ip_set_type *set_type);
extern void ip_set_type_unregister(struct ip_set_type *set_type);

/* A generic IP set */
struct ip_set {
	/* The name of the set */
	char name[IPSET_MAXNAMELEN];
	/* Lock protecting the set data */
	rwlock_t lock;
	/* References to the set */
	atomic_t ref;
	/* The core set type */
	const struct ip_set_type *type;
	/* The type variant doing the real job */
	const struct ip_set_type_variant *variant;
	/* The actual INET family */
	uint8_t family;
	/* Set type flags, filled/modified by create/resize */
	uint8_t flags;
	/* The type specific data */
	void *data;
};

/* register and unregister set references */
extern ip_set_id_t ip_set_get_byname(const char name[IPSET_MAXNAMELEN]);
extern void ip_set_put_byindex(ip_set_id_t index);

/* API for iptables set match, and SET target */
extern int ip_set_add(ip_set_id_t id, const struct sk_buff *skb,
		      uint8_t family, const uint8_t *flags);
extern int ip_set_del(ip_set_id_t id, const struct sk_buff *skb,
		      uint8_t family, const uint8_t *flags);
extern int ip_set_test(ip_set_id_t id, const struct sk_buff *skb,
		       uint8_t family, const uint8_t *flags);

/* Allocate members */
static inline void *
ip_set_alloc(size_t size, gfp_t gfp_mask, uint8_t *flags)
{
	void *members = kzalloc(size, gfp_mask);
	
	if (members) {
		*flags &= ~IP_SET_FLAG_VMALLOC;
		D("allocated with kmalloc %p", members);
		return members;
	}
	
	members = __vmalloc(size, gfp_mask | __GFP_ZERO, PAGE_KERNEL);
	if (!members)
		return NULL;
	*flags |= IP_SET_FLAG_VMALLOC;
	D("allocated with vmalloc %p", members);
	
	return members;
}

static inline void
ip_set_free(void *members, uint8_t flags)
{
	D("free with %s %p", flags & IP_SET_FLAG_VMALLOC ? "vmalloc" : "kmalloc",
	  members);
	if (flags & IP_SET_FLAG_VMALLOC)
		vfree(members);
	else
		kfree(members);
}

/* Useful converters */
static inline uint32_t
ip_set_get_h32(const struct nlattr *attr)
{
	uint32_t value = nla_get_u32(attr);
	
	return attr->nla_type & NLA_F_NET_BYTEORDER ? ntohl(value) : value;
}

static inline uint16_t
ip_set_get_h16(const struct nlattr *attr)
{
	uint16_t value = nla_get_u16(attr);
	
	return attr->nla_type & NLA_F_NET_BYTEORDER ? ntohs(value) : value;
}

static inline uint32_t
ip_set_get_n32(const struct nlattr *attr)
{
	uint32_t value = nla_get_u32(attr);
	
	return attr->nla_type & NLA_F_NET_BYTEORDER ? value : htonl(value);
}

static inline uint16_t
ip_set_get_n16(const struct nlattr *attr)
{
	uint16_t value = nla_get_u16(attr);
	
	return attr->nla_type & NLA_F_NET_BYTEORDER ? value : htons(value);
}

#define ipset_nest_start(skb, attr) nla_nest_start(skb, attr | NLA_F_NESTED)
#define ipset_nest_end(skb, start)  nla_nest_end(skb, start)	

#define NLA_PUT_NET32(skb, type, value)	\
	NLA_PUT_BE32(skb, type | NLA_F_NET_BYTEORDER, value)

#define NLA_PUT_NET16(skb, type, value)	\
	NLA_PUT_BE16(skb, type | NLA_F_NET_BYTEORDER, value)

/* Get address from skbuff */
static inline uint32_t
ip4addr(const struct sk_buff *skb, const uint8_t *flags)
{
	return flags[0] & IPSET_SRC ? ip_hdr(skb)->saddr
				    : ip_hdr(skb)->daddr;
}

static inline void
ip4addrptr(const struct sk_buff *skb, const uint8_t *flags, uint32_t *addr)
{
	*addr = flags[0] & IPSET_SRC ? ip_hdr(skb)->saddr
				     : ip_hdr(skb)->daddr;
}

static inline void
ip6addrptr(const struct sk_buff *skb, const uint8_t *flags,
	   struct in6_addr *addr)
{
	memcpy(addr, flags[0] & IPSET_SRC ? &ipv6_hdr(skb)->saddr
					  : &ipv6_hdr(skb)->daddr,
	       sizeof(*addr));
}

#define pack_ip_port(map, ip, port) \
	(port + ((ip - ((map)->first_ip)) << 16))

#endif	/* __KERNEL__ */

#endif /*_IP_SET_H */