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6#include <linux/jhash.h>
7#include <linux/module.h>
8#include <linux/ip.h>
9#include <linux/skbuff.h>
10#include <linux/errno.h>
11#include <linux/random.h>
12#include <net/ip.h>
13#include <net/ipv6.h>
14#include <net/netlink.h>
15
16#include <linux/netfilter.h>
17#include <linux/netfilter/ipset/pfxlen.h>
18#include <linux/netfilter/ipset/ip_set.h>
19#include <linux/netfilter/ipset/ip_set_hash.h>
20
21#define IPSET_TYPE_REV_MIN 0
22
23
24
25
26
27#define IPSET_TYPE_REV_MAX 6
28
29MODULE_LICENSE("GPL");
30MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>");
31IP_SET_MODULE_DESC("hash:net", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
32MODULE_ALIAS("ip_set_hash:net");
33
34
35#define HTYPE hash_net
36#define IP_SET_HASH_WITH_NETS
37
38
39
40
41struct hash_net4_elem {
42 __be32 ip;
43 u16 padding0;
44 u8 nomatch;
45 u8 cidr;
46};
47
48
49
50static inline bool
51hash_net4_data_equal(const struct hash_net4_elem *ip1,
52 const struct hash_net4_elem *ip2,
53 u32 *multi)
54{
55 return ip1->ip == ip2->ip &&
56 ip1->cidr == ip2->cidr;
57}
58
59static inline int
60hash_net4_do_data_match(const struct hash_net4_elem *elem)
61{
62 return elem->nomatch ? -ENOTEMPTY : 1;
63}
64
65static inline void
66hash_net4_data_set_flags(struct hash_net4_elem *elem, u32 flags)
67{
68 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
69}
70
71static inline void
72hash_net4_data_reset_flags(struct hash_net4_elem *elem, u8 *flags)
73{
74 swap(*flags, elem->nomatch);
75}
76
77static inline void
78hash_net4_data_netmask(struct hash_net4_elem *elem, u8 cidr)
79{
80 elem->ip &= ip_set_netmask(cidr);
81 elem->cidr = cidr;
82}
83
84static bool
85hash_net4_data_list(struct sk_buff *skb, const struct hash_net4_elem *data)
86{
87 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
88
89 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
90 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
91 (flags &&
92 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
93 goto nla_put_failure;
94 return false;
95
96nla_put_failure:
97 return true;
98}
99
100static inline void
101hash_net4_data_next(struct hash_net4_elem *next,
102 const struct hash_net4_elem *d)
103{
104 next->ip = d->ip;
105}
106
107#define MTYPE hash_net4
108#define HOST_MASK 32
109#include "ip_set_hash_gen.h"
110
111static int
112hash_net4_kadt(struct ip_set *set, const struct sk_buff *skb,
113 const struct xt_action_param *par,
114 enum ipset_adt adt, struct ip_set_adt_opt *opt)
115{
116 const struct hash_net4 *h = set->data;
117 ipset_adtfn adtfn = set->variant->adt[adt];
118 struct hash_net4_elem e = {
119 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
120 };
121 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
122
123 if (e.cidr == 0)
124 return -EINVAL;
125 if (adt == IPSET_TEST)
126 e.cidr = HOST_MASK;
127
128 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
129 e.ip &= ip_set_netmask(e.cidr);
130
131 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
132}
133
134static int
135hash_net4_uadt(struct ip_set *set, struct nlattr *tb[],
136 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
137{
138 const struct hash_net4 *h = set->data;
139 ipset_adtfn adtfn = set->variant->adt[adt];
140 struct hash_net4_elem e = { .cidr = HOST_MASK };
141 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
142 u32 ip = 0, ip_to = 0;
143 int ret;
144
145 if (tb[IPSET_ATTR_LINENO])
146 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
147
148 if (unlikely(!tb[IPSET_ATTR_IP] ||
149 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
150 return -IPSET_ERR_PROTOCOL;
151
152 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
153 if (ret)
154 return ret;
155
156 ret = ip_set_get_extensions(set, tb, &ext);
157 if (ret)
158 return ret;
159
160 if (tb[IPSET_ATTR_CIDR]) {
161 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
162 if (!e.cidr || e.cidr > HOST_MASK)
163 return -IPSET_ERR_INVALID_CIDR;
164 }
165
166 if (tb[IPSET_ATTR_CADT_FLAGS]) {
167 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
168
169 if (cadt_flags & IPSET_FLAG_NOMATCH)
170 flags |= (IPSET_FLAG_NOMATCH << 16);
171 }
172
173 if (adt == IPSET_TEST || !tb[IPSET_ATTR_IP_TO]) {
174 e.ip = htonl(ip & ip_set_hostmask(e.cidr));
175 ret = adtfn(set, &e, &ext, &ext, flags);
176 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
177 ip_set_eexist(ret, flags) ? 0 : ret;
178 }
179
180 ip_to = ip;
181 if (tb[IPSET_ATTR_IP_TO]) {
182 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
183 if (ret)
184 return ret;
185 if (ip_to < ip)
186 swap(ip, ip_to);
187 if (ip + UINT_MAX == ip_to)
188 return -IPSET_ERR_HASH_RANGE;
189 }
190 if (retried)
191 ip = ntohl(h->next.ip);
192 do {
193 e.ip = htonl(ip);
194 ip = ip_set_range_to_cidr(ip, ip_to, &e.cidr);
195 ret = adtfn(set, &e, &ext, &ext, flags);
196 if (ret && !ip_set_eexist(ret, flags))
197 return ret;
198
199 ret = 0;
200 } while (ip++ < ip_to);
201 return ret;
202}
203
204
205
206struct hash_net6_elem {
207 union nf_inet_addr ip;
208 u16 padding0;
209 u8 nomatch;
210 u8 cidr;
211};
212
213
214
215static inline bool
216hash_net6_data_equal(const struct hash_net6_elem *ip1,
217 const struct hash_net6_elem *ip2,
218 u32 *multi)
219{
220 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
221 ip1->cidr == ip2->cidr;
222}
223
224static inline int
225hash_net6_do_data_match(const struct hash_net6_elem *elem)
226{
227 return elem->nomatch ? -ENOTEMPTY : 1;
228}
229
230static inline void
231hash_net6_data_set_flags(struct hash_net6_elem *elem, u32 flags)
232{
233 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
234}
235
236static inline void
237hash_net6_data_reset_flags(struct hash_net6_elem *elem, u8 *flags)
238{
239 swap(*flags, elem->nomatch);
240}
241
242static inline void
243hash_net6_data_netmask(struct hash_net6_elem *elem, u8 cidr)
244{
245 ip6_netmask(&elem->ip, cidr);
246 elem->cidr = cidr;
247}
248
249static bool
250hash_net6_data_list(struct sk_buff *skb, const struct hash_net6_elem *data)
251{
252 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
253
254 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
255 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
256 (flags &&
257 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
258 goto nla_put_failure;
259 return false;
260
261nla_put_failure:
262 return true;
263}
264
265static inline void
266hash_net6_data_next(struct hash_net6_elem *next,
267 const struct hash_net6_elem *d)
268{
269}
270
271#undef MTYPE
272#undef HOST_MASK
273
274#define MTYPE hash_net6
275#define HOST_MASK 128
276#define IP_SET_EMIT_CREATE
277#include "ip_set_hash_gen.h"
278
279static int
280hash_net6_kadt(struct ip_set *set, const struct sk_buff *skb,
281 const struct xt_action_param *par,
282 enum ipset_adt adt, struct ip_set_adt_opt *opt)
283{
284 const struct hash_net6 *h = set->data;
285 ipset_adtfn adtfn = set->variant->adt[adt];
286 struct hash_net6_elem e = {
287 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
288 };
289 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
290
291 if (e.cidr == 0)
292 return -EINVAL;
293 if (adt == IPSET_TEST)
294 e.cidr = HOST_MASK;
295
296 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
297 ip6_netmask(&e.ip, e.cidr);
298
299 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
300}
301
302static int
303hash_net6_uadt(struct ip_set *set, struct nlattr *tb[],
304 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
305{
306 ipset_adtfn adtfn = set->variant->adt[adt];
307 struct hash_net6_elem e = { .cidr = HOST_MASK };
308 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
309 int ret;
310
311 if (tb[IPSET_ATTR_LINENO])
312 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
313
314 if (unlikely(!tb[IPSET_ATTR_IP] ||
315 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
316 return -IPSET_ERR_PROTOCOL;
317 if (unlikely(tb[IPSET_ATTR_IP_TO]))
318 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
319
320 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
321 if (ret)
322 return ret;
323
324 ret = ip_set_get_extensions(set, tb, &ext);
325 if (ret)
326 return ret;
327
328 if (tb[IPSET_ATTR_CIDR]) {
329 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
330 if (!e.cidr || e.cidr > HOST_MASK)
331 return -IPSET_ERR_INVALID_CIDR;
332 }
333
334 ip6_netmask(&e.ip, e.cidr);
335
336 if (tb[IPSET_ATTR_CADT_FLAGS]) {
337 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
338
339 if (cadt_flags & IPSET_FLAG_NOMATCH)
340 flags |= (IPSET_FLAG_NOMATCH << 16);
341 }
342
343 ret = adtfn(set, &e, &ext, &ext, flags);
344
345 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
346 ip_set_eexist(ret, flags) ? 0 : ret;
347}
348
349static struct ip_set_type hash_net_type __read_mostly = {
350 .name = "hash:net",
351 .protocol = IPSET_PROTOCOL,
352 .features = IPSET_TYPE_IP | IPSET_TYPE_NOMATCH,
353 .dimension = IPSET_DIM_ONE,
354 .family = NFPROTO_UNSPEC,
355 .revision_min = IPSET_TYPE_REV_MIN,
356 .revision_max = IPSET_TYPE_REV_MAX,
357 .create = hash_net_create,
358 .create_policy = {
359 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
360 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
361 [IPSET_ATTR_PROBES] = { .type = NLA_U8 },
362 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
363 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
364 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
365 },
366 .adt_policy = {
367 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
368 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
369 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
370 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
371 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
372 [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
373 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
374 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING,
375 .len = IPSET_MAX_COMMENT_SIZE },
376 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 },
377 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 },
378 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 },
379 },
380 .me = THIS_MODULE,
381};
382
383static int __init
384hash_net_init(void)
385{
386 return ip_set_type_register(&hash_net_type);
387}
388
389static void __exit
390hash_net_fini(void)
391{
392 rcu_barrier();
393 ip_set_type_unregister(&hash_net_type);
394}
395
396module_init(hash_net_init);
397module_exit(hash_net_fini);
398
