1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@netfilter.org>
3 * Copyright (C) 2013 Oliver Smith <oliver@8.c.9.b.0.7.4.0.1.0.0.2.ip6.arpa>
4 */
5
6/* Kernel module implementing an IP set type: the hash:net type */
7
8#include <linux/jhash.h>
9#include <linux/module.h>
10#include <linux/ip.h>
11#include <linux/skbuff.h>
12#include <linux/errno.h>
13#include <linux/random.h>
14#include <net/ip.h>
15#include <net/ipv6.h>
16#include <net/netlink.h>
17
18#include <linux/netfilter.h>
19#include <linux/netfilter/ipset/pfxlen.h>
20#include <linux/netfilter/ipset/ip_set.h>
21#include <linux/netfilter/ipset/ip_set_hash.h>
22
23#define IPSET_TYPE_REV_MIN	0
24/*				1	   Forceadd support added */
25/*				2	   skbinfo support added */
26/*				3	   bucketsize, initval support added */
27#define IPSET_TYPE_REV_MAX	4	/* bitmask support added */
28
29MODULE_LICENSE("GPL");
30MODULE_AUTHOR("Oliver Smith <oliver@8.c.9.b.0.7.4.0.1.0.0.2.ip6.arpa>");
31IP_SET_MODULE_DESC("hash:net,net", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
32MODULE_ALIAS("ip_set_hash:net,net");
33
34/* Type specific function prefix */
35#define HTYPE		hash_netnet
36#define IP_SET_HASH_WITH_NETS
37#define IP_SET_HASH_WITH_NETMASK
38#define IP_SET_HASH_WITH_BITMASK
39#define IPSET_NET_COUNT 2
40
41/* IPv4 variants */
42
43/* Member elements  */
44struct hash_netnet4_elem {
45	union {
46		__be32 ip[2];
47		__be64 ipcmp;
48	};
49	u8 nomatch;
50	u8 padding;
51	union {
52		u8 cidr[2];
53		u16 ccmp;
54	};
55};
56
57/* Common functions */
58
59static bool
60hash_netnet4_data_equal(const struct hash_netnet4_elem *ip1,
61			const struct hash_netnet4_elem *ip2,
62			u32 *multi)
63{
64	return ip1->ipcmp == ip2->ipcmp &&
65	       ip1->ccmp == ip2->ccmp;
66}
67
68static int
69hash_netnet4_do_data_match(const struct hash_netnet4_elem *elem)
70{
71	return elem->nomatch ? -ENOTEMPTY : 1;
72}
73
74static void
75hash_netnet4_data_set_flags(struct hash_netnet4_elem *elem, u32 flags)
76{
77	elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
78}
79
80static void
81hash_netnet4_data_reset_flags(struct hash_netnet4_elem *elem, u8 *flags)
82{
83	swap(*flags, elem->nomatch);
84}
85
86static void
87hash_netnet4_data_reset_elem(struct hash_netnet4_elem *elem,
88			     struct hash_netnet4_elem *orig)
89{
90	elem->ip[1] = orig->ip[1];
91}
92
93static void
94hash_netnet4_data_netmask(struct hash_netnet4_elem *elem, u8 cidr, bool inner)
95{
96	if (inner) {
97		elem->ip[1] &= ip_set_netmask(cidr);
98		elem->cidr[1] = cidr;
99	} else {
100		elem->ip[0] &= ip_set_netmask(cidr);
101		elem->cidr[0] = cidr;
102	}
103}
104
105static bool
106hash_netnet4_data_list(struct sk_buff *skb,
107		       const struct hash_netnet4_elem *data)
108{
109	u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
110
111	if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip[0]) ||
112	    nla_put_ipaddr4(skb, IPSET_ATTR_IP2, data->ip[1]) ||
113	    nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr[0]) ||
114	    nla_put_u8(skb, IPSET_ATTR_CIDR2, data->cidr[1]) ||
115	    (flags &&
116	     nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
117		goto nla_put_failure;
118	return false;
119
120nla_put_failure:
121	return true;
122}
123
124static void
125hash_netnet4_data_next(struct hash_netnet4_elem *next,
126		       const struct hash_netnet4_elem *d)
127{
128	next->ipcmp = d->ipcmp;
129}
130
131#define MTYPE		hash_netnet4
132#define HOST_MASK	32
133#include "ip_set_hash_gen.h"
134
135static void
136hash_netnet4_init(struct hash_netnet4_elem *e)
137{
138	e->cidr[0] = HOST_MASK;
139	e->cidr[1] = HOST_MASK;
140}
141
142static int
143hash_netnet4_kadt(struct ip_set *set, const struct sk_buff *skb,
144		  const struct xt_action_param *par,
145		  enum ipset_adt adt, struct ip_set_adt_opt *opt)
146{
147	const struct hash_netnet4 *h = set->data;
148	ipset_adtfn adtfn = set->variant->adt[adt];
149	struct hash_netnet4_elem e = { };
150	struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
151
152	e.cidr[0] = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK);
153	e.cidr[1] = INIT_CIDR(h->nets[0].cidr[1], HOST_MASK);
154	if (adt == IPSET_TEST)
155		e.ccmp = (HOST_MASK << (sizeof(e.cidr[0]) * 8)) | HOST_MASK;
156
157	ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip[0]);
158	ip4addrptr(skb, opt->flags & IPSET_DIM_TWO_SRC, &e.ip[1]);
159	e.ip[0] &= (ip_set_netmask(e.cidr[0]) & h->bitmask.ip);
160	e.ip[1] &= (ip_set_netmask(e.cidr[1]) & h->bitmask.ip);
161
162	return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
163}
164
165static int
166hash_netnet4_uadt(struct ip_set *set, struct nlattr *tb[],
167		  enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
168{
169	struct hash_netnet4 *h = set->data;
170	ipset_adtfn adtfn = set->variant->adt[adt];
171	struct hash_netnet4_elem e = { };
172	struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
173	u32 ip = 0, ip_to = 0;
174	u32 ip2 = 0, ip2_from = 0, ip2_to = 0, i = 0;
175	int ret;
176
177	if (tb[IPSET_ATTR_LINENO])
178		*lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
179
180	hash_netnet4_init(&e);
181	if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
182		     !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
183		return -IPSET_ERR_PROTOCOL;
184
185	ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
186	if (ret)
187		return ret;
188
189	ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP2], &ip2_from);
190	if (ret)
191		return ret;
192
193	ret = ip_set_get_extensions(set, tb, &ext);
194	if (ret)
195		return ret;
196
197	if (tb[IPSET_ATTR_CIDR]) {
198		e.cidr[0] = nla_get_u8(tb[IPSET_ATTR_CIDR]);
199		if (!e.cidr[0] || e.cidr[0] > HOST_MASK)
200			return -IPSET_ERR_INVALID_CIDR;
201	}
202
203	if (tb[IPSET_ATTR_CIDR2]) {
204		e.cidr[1] = nla_get_u8(tb[IPSET_ATTR_CIDR2]);
205		if (!e.cidr[1] || e.cidr[1] > HOST_MASK)
206			return -IPSET_ERR_INVALID_CIDR;
207	}
208
209	if (tb[IPSET_ATTR_CADT_FLAGS]) {
210		u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
211
212		if (cadt_flags & IPSET_FLAG_NOMATCH)
213			flags |= (IPSET_FLAG_NOMATCH << 16);
214	}
215
216	if (adt == IPSET_TEST || !(tb[IPSET_ATTR_IP_TO] ||
217				   tb[IPSET_ATTR_IP2_TO])) {
218		e.ip[0] = htonl(ip & ntohl(h->bitmask.ip) & ip_set_hostmask(e.cidr[0]));
219		e.ip[1] = htonl(ip2_from & ntohl(h->bitmask.ip) & ip_set_hostmask(e.cidr[1]));
220		ret = adtfn(set, &e, &ext, &ext, flags);
221		return ip_set_enomatch(ret, flags, adt, set) ? -ret :
222		       ip_set_eexist(ret, flags) ? 0 : ret;
223	}
224
225	ip_to = ip;
226	if (tb[IPSET_ATTR_IP_TO]) {
227		ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
228		if (ret)
229			return ret;
230		if (ip_to < ip)
231			swap(ip, ip_to);
232		if (unlikely(ip + UINT_MAX == ip_to))
233			return -IPSET_ERR_HASH_RANGE;
234	} else {
235		ip_set_mask_from_to(ip, ip_to, e.cidr[0]);
236	}
237
238	ip2_to = ip2_from;
239	if (tb[IPSET_ATTR_IP2_TO]) {
240		ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP2_TO], &ip2_to);
241		if (ret)
242			return ret;
243		if (ip2_to < ip2_from)
244			swap(ip2_from, ip2_to);
245		if (unlikely(ip2_from + UINT_MAX == ip2_to))
246			return -IPSET_ERR_HASH_RANGE;
247	} else {
248		ip_set_mask_from_to(ip2_from, ip2_to, e.cidr[1]);
249	}
250
251	if (retried) {
252		ip = ntohl(h->next.ip[0]);
253		ip2 = ntohl(h->next.ip[1]);
254	} else {
255		ip2 = ip2_from;
256	}
257
258	do {
259		e.ip[0] = htonl(ip);
260		ip = ip_set_range_to_cidr(ip, ip_to, &e.cidr[0]);
261		do {
262			i++;
263			e.ip[1] = htonl(ip2);
264			if (i > IPSET_MAX_RANGE) {
265				hash_netnet4_data_next(&h->next, &e);
266				return -ERANGE;
267			}
268			ip2 = ip_set_range_to_cidr(ip2, ip2_to, &e.cidr[1]);
269			ret = adtfn(set, &e, &ext, &ext, flags);
270			if (ret && !ip_set_eexist(ret, flags))
271				return ret;
272
273			ret = 0;
274		} while (ip2++ < ip2_to);
275		ip2 = ip2_from;
276	} while (ip++ < ip_to);
277	return ret;
278}
279
280/* IPv6 variants */
281
282struct hash_netnet6_elem {
283	union nf_inet_addr ip[2];
284	u8 nomatch;
285	u8 padding;
286	union {
287		u8 cidr[2];
288		u16 ccmp;
289	};
290};
291
292/* Common functions */
293
294static bool
295hash_netnet6_data_equal(const struct hash_netnet6_elem *ip1,
296			const struct hash_netnet6_elem *ip2,
297			u32 *multi)
298{
299	return ipv6_addr_equal(&ip1->ip[0].in6, &ip2->ip[0].in6) &&
300	       ipv6_addr_equal(&ip1->ip[1].in6, &ip2->ip[1].in6) &&
301	       ip1->ccmp == ip2->ccmp;
302}
303
304static int
305hash_netnet6_do_data_match(const struct hash_netnet6_elem *elem)
306{
307	return elem->nomatch ? -ENOTEMPTY : 1;
308}
309
310static void
311hash_netnet6_data_set_flags(struct hash_netnet6_elem *elem, u32 flags)
312{
313	elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
314}
315
316static void
317hash_netnet6_data_reset_flags(struct hash_netnet6_elem *elem, u8 *flags)
318{
319	swap(*flags, elem->nomatch);
320}
321
322static void
323hash_netnet6_data_reset_elem(struct hash_netnet6_elem *elem,
324			     struct hash_netnet6_elem *orig)
325{
326	elem->ip[1] = orig->ip[1];
327}
328
329static void
330hash_netnet6_data_netmask(struct hash_netnet6_elem *elem, u8 cidr, bool inner)
331{
332	if (inner) {
333		ip6_netmask(&elem->ip[1], cidr);
334		elem->cidr[1] = cidr;
335	} else {
336		ip6_netmask(&elem->ip[0], cidr);
337		elem->cidr[0] = cidr;
338	}
339}
340
341static bool
342hash_netnet6_data_list(struct sk_buff *skb,
343		       const struct hash_netnet6_elem *data)
344{
345	u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
346
347	if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip[0].in6) ||
348	    nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip[1].in6) ||
349	    nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr[0]) ||
350	    nla_put_u8(skb, IPSET_ATTR_CIDR2, data->cidr[1]) ||
351	    (flags &&
352	     nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
353		goto nla_put_failure;
354	return false;
355
356nla_put_failure:
357	return true;
358}
359
360static void
361hash_netnet6_data_next(struct hash_netnet6_elem *next,
362		       const struct hash_netnet6_elem *d)
363{
364}
365
366#undef MTYPE
367#undef HOST_MASK
368
369#define MTYPE		hash_netnet6
370#define HOST_MASK	128
371#define IP_SET_EMIT_CREATE
372#include "ip_set_hash_gen.h"
373
374static void
375hash_netnet6_init(struct hash_netnet6_elem *e)
376{
377	e->cidr[0] = HOST_MASK;
378	e->cidr[1] = HOST_MASK;
379}
380
381static int
382hash_netnet6_kadt(struct ip_set *set, const struct sk_buff *skb,
383		  const struct xt_action_param *par,
384		  enum ipset_adt adt, struct ip_set_adt_opt *opt)
385{
386	const struct hash_netnet6 *h = set->data;
387	ipset_adtfn adtfn = set->variant->adt[adt];
388	struct hash_netnet6_elem e = { };
389	struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
390
391	e.cidr[0] = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK);
392	e.cidr[1] = INIT_CIDR(h->nets[0].cidr[1], HOST_MASK);
393	if (adt == IPSET_TEST)
394		e.ccmp = (HOST_MASK << (sizeof(u8) * 8)) | HOST_MASK;
395
396	ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip[0].in6);
397	ip6addrptr(skb, opt->flags & IPSET_DIM_TWO_SRC, &e.ip[1].in6);
398	ip6_netmask(&e.ip[0], e.cidr[0]);
399	ip6_netmask(&e.ip[1], e.cidr[1]);
400
401	nf_inet_addr_mask_inplace(&e.ip[0], &h->bitmask);
402	nf_inet_addr_mask_inplace(&e.ip[1], &h->bitmask);
403	if (e.cidr[0] == HOST_MASK && ipv6_addr_any(&e.ip[0].in6))
404		return -EINVAL;
405
406	return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
407}
408
409static int
410hash_netnet6_uadt(struct ip_set *set, struct nlattr *tb[],
411		  enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
412{
413	ipset_adtfn adtfn = set->variant->adt[adt];
414	struct hash_netnet6_elem e = { };
415	struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
416	const struct hash_netnet6 *h = set->data;
417	int ret;
418
419	if (tb[IPSET_ATTR_LINENO])
420		*lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
421
422	hash_netnet6_init(&e);
423	if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
424		     !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
425		return -IPSET_ERR_PROTOCOL;
426	if (unlikely(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_IP2_TO]))
427		return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
428
429	ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip[0]);
430	if (ret)
431		return ret;
432
433	ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP2], &e.ip[1]);
434	if (ret)
435		return ret;
436
437	ret = ip_set_get_extensions(set, tb, &ext);
438	if (ret)
439		return ret;
440
441	if (tb[IPSET_ATTR_CIDR]) {
442		e.cidr[0] = nla_get_u8(tb[IPSET_ATTR_CIDR]);
443		if (!e.cidr[0] || e.cidr[0] > HOST_MASK)
444			return -IPSET_ERR_INVALID_CIDR;
445	}
446
447	if (tb[IPSET_ATTR_CIDR2]) {
448		e.cidr[1] = nla_get_u8(tb[IPSET_ATTR_CIDR2]);
449		if (!e.cidr[1] || e.cidr[1] > HOST_MASK)
450			return -IPSET_ERR_INVALID_CIDR;
451	}
452
453	ip6_netmask(&e.ip[0], e.cidr[0]);
454	ip6_netmask(&e.ip[1], e.cidr[1]);
455
456	nf_inet_addr_mask_inplace(&e.ip[0], &h->bitmask);
457	nf_inet_addr_mask_inplace(&e.ip[1], &h->bitmask);
458	if (e.cidr[0] == HOST_MASK && ipv6_addr_any(&e.ip[0].in6))
459		return -IPSET_ERR_HASH_ELEM;
460
461	if (tb[IPSET_ATTR_CADT_FLAGS]) {
462		u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
463
464		if (cadt_flags & IPSET_FLAG_NOMATCH)
465			flags |= (IPSET_FLAG_NOMATCH << 16);
466	}
467
468	ret = adtfn(set, &e, &ext, &ext, flags);
469
470	return ip_set_enomatch(ret, flags, adt, set) ? -ret :
471	       ip_set_eexist(ret, flags) ? 0 : ret;
472}
473
474static struct ip_set_type hash_netnet_type __read_mostly = {
475	.name		= "hash:net,net",
476	.protocol	= IPSET_PROTOCOL,
477	.features	= IPSET_TYPE_IP | IPSET_TYPE_IP2 | IPSET_TYPE_NOMATCH,
478	.dimension	= IPSET_DIM_TWO,
479	.family		= NFPROTO_UNSPEC,
480	.revision_min	= IPSET_TYPE_REV_MIN,
481	.revision_max	= IPSET_TYPE_REV_MAX,
482	.create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE,
483	.create		= hash_netnet_create,
484	.create_policy	= {
485		[IPSET_ATTR_HASHSIZE]	= { .type = NLA_U32 },
486		[IPSET_ATTR_MAXELEM]	= { .type = NLA_U32 },
487		[IPSET_ATTR_INITVAL]	= { .type = NLA_U32 },
488		[IPSET_ATTR_BUCKETSIZE]	= { .type = NLA_U8 },
489		[IPSET_ATTR_RESIZE]	= { .type = NLA_U8  },
490		[IPSET_ATTR_TIMEOUT]	= { .type = NLA_U32 },
491		[IPSET_ATTR_CADT_FLAGS]	= { .type = NLA_U32 },
492		[IPSET_ATTR_NETMASK]    = { .type = NLA_U8 },
493		[IPSET_ATTR_BITMASK]	= { .type = NLA_NESTED },
494	},
495	.adt_policy	= {
496		[IPSET_ATTR_IP]		= { .type = NLA_NESTED },
497		[IPSET_ATTR_IP_TO]	= { .type = NLA_NESTED },
498		[IPSET_ATTR_IP2]	= { .type = NLA_NESTED },
499		[IPSET_ATTR_IP2_TO]	= { .type = NLA_NESTED },
500		[IPSET_ATTR_CIDR]	= { .type = NLA_U8 },
501		[IPSET_ATTR_CIDR2]	= { .type = NLA_U8 },
502		[IPSET_ATTR_TIMEOUT]	= { .type = NLA_U32 },
503		[IPSET_ATTR_LINENO]	= { .type = NLA_U32 },
504		[IPSET_ATTR_CADT_FLAGS]	= { .type = NLA_U32 },
505		[IPSET_ATTR_BYTES]	= { .type = NLA_U64 },
506		[IPSET_ATTR_PACKETS]	= { .type = NLA_U64 },
507		[IPSET_ATTR_COMMENT]	= { .type = NLA_NUL_STRING,
508					    .len  = IPSET_MAX_COMMENT_SIZE },
509		[IPSET_ATTR_SKBMARK]	= { .type = NLA_U64 },
510		[IPSET_ATTR_SKBPRIO]	= { .type = NLA_U32 },
511		[IPSET_ATTR_SKBQUEUE]	= { .type = NLA_U16 },
512	},
513	.me		= THIS_MODULE,
514};
515
516static int __init
517hash_netnet_init(void)
518{
519	return ip_set_type_register(&hash_netnet_type);
520}
521
522static void __exit
523hash_netnet_fini(void)
524{
525	rcu_barrier();
526	ip_set_type_unregister(&hash_netnet_type);
527}
528
529module_init(hash_netnet_init);
530module_exit(hash_netnet_fini);
531