summaryrefslogtreecommitdiffstats
path: root/kernel/net/netfilter/ipset/ip_set_hash_netiface.c
blob: d7bdb06ecca08cf0e3fdca2a41f0ad173e5ee0cb (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
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
/* Copyright (C) 2011-2013 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:net,iface 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 <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    nomatch flag support added */
/*				2    /0 support added */
/*				3    Counters support added */
/*				4    Comments support added */
/*				5    Forceadd support added */
#define IPSET_TYPE_REV_MAX	6 /* skbinfo support added */

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

/* Type specific function prefix */
#define HTYPE		hash_netiface
#define IP_SET_HASH_WITH_NETS
#define IP_SET_HASH_WITH_MULTI
#define IP_SET_HASH_WITH_NET0

#define STREQ(a, b)	(strcmp(a, b) == 0)
#define IFNAMCPY(a, b)	strncpy(a, b, IFNAMSIZ)

/* IPv4 variant */

struct hash_netiface4_elem_hashed {
	__be32 ip;
	u8 physdev;
	u8 cidr;
	u8 nomatch;
	u8 elem;
};

/* Member elements */
struct hash_netiface4_elem {
	__be32 ip;
	u8 physdev;
	u8 cidr;
	u8 nomatch;
	u8 elem;
	char iface[IFNAMSIZ];
};

/* Common functions */

static inline bool
hash_netiface4_data_equal(const struct hash_netiface4_elem *ip1,
			  const struct hash_netiface4_elem *ip2,
			  u32 *multi)
{
	return ip1->ip == ip2->ip &&
	       ip1->cidr == ip2->cidr &&
	       (++*multi) &&
	       ip1->physdev == ip2->physdev &&
	       STREQ(ip1->iface, ip2->iface);
}

static inline int
hash_netiface4_do_data_match(const struct hash_netiface4_elem *elem)
{
	return elem->nomatch ? -ENOTEMPTY : 1;
}

static inline void
hash_netiface4_data_set_flags(struct hash_netiface4_elem *elem, u32 flags)
{
	elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
}

static inline void
hash_netiface4_data_reset_flags(struct hash_netiface4_elem *elem, u8 *flags)
{
	swap(*flags, elem->nomatch);
}

static inline void
hash_netiface4_data_netmask(struct hash_netiface4_elem *elem, u8 cidr)
{
	elem->ip &= ip_set_netmask(cidr);
	elem->cidr = cidr;
}

static bool
hash_netiface4_data_list(struct sk_buff *skb,
			 const struct hash_netiface4_elem *data)
{
	u32 flags = data->physdev ? IPSET_FLAG_PHYSDEV : 0;

	if (data->nomatch)
		flags |= IPSET_FLAG_NOMATCH;
	if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
	    nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
	    nla_put_string(skb, IPSET_ATTR_IFACE, data->iface) ||
	    (flags &&
	     nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return 1;
}

static inline void
hash_netiface4_data_next(struct hash_netiface4_elem *next,
			 const struct hash_netiface4_elem *d)
{
	next->ip = d->ip;
}

#define MTYPE		hash_netiface4
#define PF		4
#define HOST_MASK	32
#define HKEY_DATALEN	sizeof(struct hash_netiface4_elem_hashed)
#include "ip_set_hash_gen.h"

static int
hash_netiface4_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 hash_netiface *h = set->data;
	ipset_adtfn adtfn = set->variant->adt[adt];
	struct hash_netiface4_elem e = {
		.cidr = IP_SET_INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
		.elem = 1,
	};
	struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);

	if (e.cidr == 0)
		return -EINVAL;
	if (adt == IPSET_TEST)
		e.cidr = HOST_MASK;

	ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
	e.ip &= ip_set_netmask(e.cidr);

#define IFACE(dir)	(par->dir ? par->dir->name : "")
#define PHYSDEV(dir)	(nf_bridge->dir ? nf_bridge->dir->name : "")
#define SRCDIR		(opt->flags & IPSET_DIM_TWO_SRC)

	if (opt->cmdflags & IPSET_FLAG_PHYSDEV) {
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
		const struct nf_bridge_info *nf_bridge = skb->nf_bridge;

		if (!nf_bridge)
			return -EINVAL;
		IFNAMCPY(e.iface,
			 SRCDIR ? PHYSDEV(physindev) : PHYSDEV(physoutdev));
		e.physdev = 1;
#endif
	} else
		IFNAMCPY(e.iface, SRCDIR ? IFACE(in) : IFACE(out));

	if (strlen(e.iface) == 0)
		return -EINVAL;
	return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
}

static int
hash_netiface4_uadt(struct ip_set *set, struct nlattr *tb[],
		    enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
{
	struct hash_netiface *h = set->data;
	ipset_adtfn adtfn = set->variant->adt[adt];
	struct hash_netiface4_elem e = { .cidr = HOST_MASK, .elem = 1 };
	struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
	u32 ip = 0, ip_to = 0, last;
	int ret;

	if (unlikely(!tb[IPSET_ATTR_IP] ||
		     !tb[IPSET_ATTR_IFACE] ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS) ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE)))
		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;

	if (tb[IPSET_ATTR_CIDR]) {
		e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
		if (e.cidr > HOST_MASK)
			return -IPSET_ERR_INVALID_CIDR;
	}
	IFNAMCPY(e.iface, nla_data(tb[IPSET_ATTR_IFACE]));

	if (tb[IPSET_ATTR_CADT_FLAGS]) {
		u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);

		if (cadt_flags & IPSET_FLAG_PHYSDEV)
			e.physdev = 1;
		if (cadt_flags & IPSET_FLAG_NOMATCH)
			flags |= (IPSET_FLAG_NOMATCH << 16);
	}
	if (adt == IPSET_TEST || !tb[IPSET_ATTR_IP_TO]) {
		e.ip = htonl(ip & ip_set_hostmask(e.cidr));
		ret = adtfn(set, &e, &ext, &ext, flags);
		return ip_set_enomatch(ret, flags, adt, set) ? -ret :
		       ip_set_eexist(ret, flags) ? 0 : ret;
	}

	if (tb[IPSET_ATTR_IP_TO]) {
		ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
		if (ret)
			return ret;
		if (ip_to < ip)
			swap(ip, ip_to);
		if (ip + UINT_MAX == ip_to)
			return -IPSET_ERR_HASH_RANGE;
	} else
		ip_set_mask_from_to(ip, ip_to, e.cidr);

	if (retried)
		ip = ntohl(h->next.ip);
	while (!after(ip, ip_to)) {
		e.ip = htonl(ip);
		last = ip_set_range_to_cidr(ip, ip_to, &e.cidr);
		ret = adtfn(set, &e, &ext, &ext, flags);

		if (ret && !ip_set_eexist(ret, flags))
			return ret;
		else
			ret = 0;
		ip = last + 1;
	}
	return ret;
}

/* IPv6 variant */

struct hash_netiface6_elem_hashed {
	union nf_inet_addr ip;
	u8 physdev;
	u8 cidr;
	u8 nomatch;
	u8 elem;
};

struct hash_netiface6_elem {
	union nf_inet_addr ip;
	u8 physdev;
	u8 cidr;
	u8 nomatch;
	u8 elem;
	char iface[IFNAMSIZ];
};

/* Common functions */

static inline bool
hash_netiface6_data_equal(const struct hash_netiface6_elem *ip1,
			  const struct hash_netiface6_elem *ip2,
			  u32 *multi)
{
	return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
	       ip1->cidr == ip2->cidr &&
	       (++*multi) &&
	       ip1->physdev == ip2->physdev &&
	       STREQ(ip1->iface, ip2->iface);
}

static inline int
hash_netiface6_do_data_match(const struct hash_netiface6_elem *elem)
{
	return elem->nomatch ? -ENOTEMPTY : 1;
}

static inline void
hash_netiface6_data_set_flags(struct hash_netiface6_elem *elem, u32 flags)
{
	elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
}

static inline void
hash_netiface6_data_reset_flags(struct hash_netiface6_elem *elem, u8 *flags)
{
	swap(*flags, elem->nomatch);
}

static inline void
hash_netiface6_data_netmask(struct hash_netiface6_elem *elem, u8 cidr)
{
	ip6_netmask(&elem->ip, cidr);
	elem->cidr = cidr;
}

static bool
hash_netiface6_data_list(struct sk_buff *skb,
			 const struct hash_netiface6_elem *data)
{
	u32 flags = data->physdev ? IPSET_FLAG_PHYSDEV : 0;

	if (data->nomatch)
		flags |= IPSET_FLAG_NOMATCH;
	if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
	    nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
	    nla_put_string(skb, IPSET_ATTR_IFACE, data->iface) ||
	    (flags &&
	     nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return 1;
}

static inline void
hash_netiface6_data_next(struct hash_netiface4_elem *next,
			 const struct hash_netiface6_elem *d)
{
}

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

#define MTYPE		hash_netiface6
#define PF		6
#define HOST_MASK	128
#define HKEY_DATALEN	sizeof(struct hash_netiface6_elem_hashed)
#define IP_SET_EMIT_CREATE
#include "ip_set_hash_gen.h"

static int
hash_netiface6_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 hash_netiface *h = set->data;
	ipset_adtfn adtfn = set->variant->adt[adt];
	struct hash_netiface6_elem e = {
		.cidr = IP_SET_INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
		.elem = 1,
	};
	struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);

	if (e.cidr == 0)
		return -EINVAL;
	if (adt == IPSET_TEST)
		e.cidr = HOST_MASK;

	ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
	ip6_netmask(&e.ip, e.cidr);

	if (opt->cmdflags & IPSET_FLAG_PHYSDEV) {
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
		const struct nf_bridge_info *nf_bridge = skb->nf_bridge;

		if (!nf_bridge)
			return -EINVAL;
		IFNAMCPY(e.iface,
			 SRCDIR ? PHYSDEV(physindev) : PHYSDEV(physoutdev));
		e.physdev = 1;
#endif
	} else
		IFNAMCPY(e.iface, SRCDIR ? IFACE(in) : IFACE(out));

	if (strlen(e.iface) == 0)
		return -EINVAL;

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

static int
hash_netiface6_uadt(struct ip_set *set, struct nlattr *tb[],
		   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
{
	ipset_adtfn adtfn = set->variant->adt[adt];
	struct hash_netiface6_elem e = { .cidr = HOST_MASK, .elem = 1 };
	struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
	int ret;

	if (unlikely(!tb[IPSET_ATTR_IP] ||
		     !tb[IPSET_ATTR_IFACE] ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS) ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) ||
		     !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE)))
		return -IPSET_ERR_PROTOCOL;
	if (unlikely(tb[IPSET_ATTR_IP_TO]))
		return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;

	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;

	if (tb[IPSET_ATTR_CIDR])
		e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
	if (e.cidr > HOST_MASK)
		return -IPSET_ERR_INVALID_CIDR;
	ip6_netmask(&e.ip, e.cidr);

	IFNAMCPY(e.iface, nla_data(tb[IPSET_ATTR_IFACE]));

	if (tb[IPSET_ATTR_CADT_FLAGS]) {
		u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);

		if (cadt_flags & IPSET_FLAG_PHYSDEV)
			e.physdev = 1;
		if (cadt_flags & IPSET_FLAG_NOMATCH)
			flags |= (IPSET_FLAG_NOMATCH << 16);
	}

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

	return ip_set_enomatch(ret, flags, adt, set) ? -ret :
	       ip_set_eexist(ret, flags) ? 0 : ret;
}

static struct ip_set_type hash_netiface_type __read_mostly = {
	.name		= "hash:net,iface",
	.protocol	= IPSET_PROTOCOL,
	.features	= IPSET_TYPE_IP | IPSET_TYPE_IFACE |
			  IPSET_TYPE_NOMATCH,
	.dimension	= IPSET_DIM_TWO,
	.family		= NFPROTO_UNSPEC,
	.revision_min	= IPSET_TYPE_REV_MIN,
	.revision_max	= IPSET_TYPE_REV_MAX,
	.create		= hash_netiface_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_PROTO]	= { .type = NLA_U8 },
		[IPSET_ATTR_TIMEOUT]	= { .type = NLA_U32 },
		[IPSET_ATTR_CADT_FLAGS]	= { .type = NLA_U32 },
	},
	.adt_policy	= {
		[IPSET_ATTR_IP]		= { .type = NLA_NESTED },
		[IPSET_ATTR_IP_TO]	= { .type = NLA_NESTED },
		[IPSET_ATTR_IFACE]	= { .type = NLA_NUL_STRING,
					    .len  = IFNAMSIZ - 1 },
		[IPSET_ATTR_CADT_FLAGS]	= { .type = NLA_U32 },
		[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 },
		[IPSET_ATTR_SKBMARK]	= { .type = NLA_U64 },
		[IPSET_ATTR_SKBPRIO]	= { .type = NLA_U32 },
		[IPSET_ATTR_SKBQUEUE]	= { .type = NLA_U16 },
	},
	.me		= THIS_MODULE,
};

static int __init
hash_netiface_init(void)
{
	return ip_set_type_register(&hash_netiface_type);
}

static void __exit
hash_netiface_fini(void)
{
	ip_set_type_unregister(&hash_netiface_type);
}

module_init(hash_netiface_init);
module_exit(hash_netiface_fini);