1
2
3
4
5
6
7
8
9
10#include <linux/jhash.h>
11#include <linux/module.h>
12#include <linux/ip.h>
13#include <linux/skbuff.h>
14#include <linux/errno.h>
15#include <linux/random.h>
16#include <net/ip.h>
17#include <net/ipv6.h>
18#include <net/netlink.h>
19
20#include <linux/netfilter.h>
21#include <linux/netfilter/ipset/pfxlen.h>
22#include <linux/netfilter/ipset/ip_set.h>
23#include <linux/netfilter/ipset/ip_set_hash.h>
24
25#define IPSET_TYPE_REV_MIN 0
26
27
28
29#define IPSET_TYPE_REV_MAX 4
30
31MODULE_LICENSE("GPL");
32MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
33IP_SET_MODULE_DESC("hash:net", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
34MODULE_ALIAS("ip_set_hash:net");
35
36
37#define HTYPE hash_net
38#define IP_SET_HASH_WITH_NETS
39
40
41
42
43struct hash_net4_elem {
44 __be32 ip;
45 u16 padding0;
46 u8 nomatch;
47 u8 cidr;
48};
49
50
51
52static inline bool
53hash_net4_data_equal(const struct hash_net4_elem *ip1,
54 const struct hash_net4_elem *ip2,
55 u32 *multi)
56{
57 return ip1->ip == ip2->ip &&
58 ip1->cidr == ip2->cidr;
59}
60
61static inline int
62hash_net4_do_data_match(const struct hash_net4_elem *elem)
63{
64 return elem->nomatch ? -ENOTEMPTY : 1;
65}
66
67static inline void
68hash_net4_data_set_flags(struct hash_net4_elem *elem, u32 flags)
69{
70 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
71}
72
73static inline void
74hash_net4_data_reset_flags(struct hash_net4_elem *elem, u8 *flags)
75{
76 swap(*flags, elem->nomatch);
77}
78
79static inline void
80hash_net4_data_netmask(struct hash_net4_elem *elem, u8 cidr)
81{
82 elem->ip &= ip_set_netmask(cidr);
83 elem->cidr = cidr;
84}
85
86static bool
87hash_net4_data_list(struct sk_buff *skb, const struct hash_net4_elem *data)
88{
89 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
90
91 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
92 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
93 (flags &&
94 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
95 goto nla_put_failure;
96 return 0;
97
98nla_put_failure:
99 return 1;
100}
101
102static inline void
103hash_net4_data_next(struct hash_net4_elem *next,
104 const struct hash_net4_elem *d)
105{
106 next->ip = d->ip;
107}
108
109#define MTYPE hash_net4
110#define PF 4
111#define HOST_MASK 32
112#include "ip_set_hash_gen.h"
113
114static int
115hash_net4_kadt(struct ip_set *set, const struct sk_buff *skb,
116 const struct xt_action_param *par,
117 enum ipset_adt adt, struct ip_set_adt_opt *opt)
118{
119 const struct hash_net *h = set->data;
120 ipset_adtfn adtfn = set->variant->adt[adt];
121 struct hash_net4_elem e = {
122 .cidr = IP_SET_INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
123 };
124 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
125
126 if (e.cidr == 0)
127 return -EINVAL;
128 if (adt == IPSET_TEST)
129 e.cidr = HOST_MASK;
130
131 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
132 e.ip &= ip_set_netmask(e.cidr);
133
134 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
135}
136
137static int
138hash_net4_uadt(struct ip_set *set, struct nlattr *tb[],
139 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
140{
141 const struct hash_net *h = set->data;
142 ipset_adtfn adtfn = set->variant->adt[adt];
143 struct hash_net4_elem e = { .cidr = HOST_MASK };
144 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
145 u32 ip = 0, ip_to = 0, last;
146 int ret;
147
148 if (unlikely(!tb[IPSET_ATTR_IP] ||
149 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
150 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS) ||
151 !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
152 !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
153 return -IPSET_ERR_PROTOCOL;
154
155 if (tb[IPSET_ATTR_LINENO])
156 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
157
158 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip) ||
159 ip_set_get_extensions(set, tb, &ext);
160 if (ret)
161 return ret;
162
163 if (tb[IPSET_ATTR_CIDR]) {
164 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
165 if (!e.cidr || e.cidr > HOST_MASK)
166 return -IPSET_ERR_INVALID_CIDR;
167 }
168
169 if (tb[IPSET_ATTR_CADT_FLAGS]) {
170 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
171 if (cadt_flags & IPSET_FLAG_NOMATCH)
172 flags |= (IPSET_FLAG_NOMATCH << 16);
173 }
174
175 if (adt == IPSET_TEST || !tb[IPSET_ATTR_IP_TO]) {
176 e.ip = htonl(ip & ip_set_hostmask(e.cidr));
177 ret = adtfn(set, &e, &ext, &ext, flags);
178 return ip_set_enomatch(ret, flags, adt, set) ? -ret:
179 ip_set_eexist(ret, flags) ? 0 : ret;
180 }
181
182 ip_to = ip;
183 if (tb[IPSET_ATTR_IP_TO]) {
184 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
185 if (ret)
186 return ret;
187 if (ip_to < ip)
188 swap(ip, ip_to);
189 if (ip + UINT_MAX == ip_to)
190 return -IPSET_ERR_HASH_RANGE;
191 }
192 if (retried)
193 ip = ntohl(h->next.ip);
194 while (!after(ip, ip_to)) {
195 e.ip = htonl(ip);
196 last = ip_set_range_to_cidr(ip, ip_to, &e.cidr);
197 ret = adtfn(set, &e, &ext, &ext, flags);
198 if (ret && !ip_set_eexist(ret, flags))
199 return ret;
200 else
201 ret = 0;
202 ip = last + 1;
203 }
204 return ret;
205}
206
207
208
209struct hash_net6_elem {
210 union nf_inet_addr ip;
211 u16 padding0;
212 u8 nomatch;
213 u8 cidr;
214};
215
216
217
218static inline bool
219hash_net6_data_equal(const struct hash_net6_elem *ip1,
220 const struct hash_net6_elem *ip2,
221 u32 *multi)
222{
223 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
224 ip1->cidr == ip2->cidr;
225}
226
227static inline int
228hash_net6_do_data_match(const struct hash_net6_elem *elem)
229{
230 return elem->nomatch ? -ENOTEMPTY : 1;
231}
232
233static inline void
234hash_net6_data_set_flags(struct hash_net6_elem *elem, u32 flags)
235{
236 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
237}
238
239static inline void
240hash_net6_data_reset_flags(struct hash_net6_elem *elem, u8 *flags)
241{
242 swap(*flags, elem->nomatch);
243}
244
245static inline void
246hash_net6_data_netmask(struct hash_net6_elem *elem, u8 cidr)
247{
248 ip6_netmask(&elem->ip, cidr);
249 elem->cidr = cidr;
250}
251
252static bool
253hash_net6_data_list(struct sk_buff *skb, const struct hash_net6_elem *data)
254{
255 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
256
257 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
258 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
259 (flags &&
260 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
261 goto nla_put_failure;
262 return 0;
263
264nla_put_failure:
265 return 1;
266}
267
268static inline void
269hash_net6_data_next(struct hash_net4_elem *next,
270 const struct hash_net6_elem *d)
271{
272}
273
274#undef MTYPE
275#undef PF
276#undef HOST_MASK
277
278#define MTYPE hash_net6
279#define PF 6
280#define HOST_MASK 128
281#define IP_SET_EMIT_CREATE
282#include "ip_set_hash_gen.h"
283
284static int
285hash_net6_kadt(struct ip_set *set, const struct sk_buff *skb,
286 const struct xt_action_param *par,
287 enum ipset_adt adt, struct ip_set_adt_opt *opt)
288{
289 const struct hash_net *h = set->data;
290 ipset_adtfn adtfn = set->variant->adt[adt];
291 struct hash_net6_elem e = {
292 .cidr = IP_SET_INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
293 };
294 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
295
296 if (e.cidr == 0)
297 return -EINVAL;
298 if (adt == IPSET_TEST)
299 e.cidr = HOST_MASK;
300
301 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
302 ip6_netmask(&e.ip, e.cidr);
303
304 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
305}
306
307static int
308hash_net6_uadt(struct ip_set *set, struct nlattr *tb[],
309 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
310{
311 ipset_adtfn adtfn = set->variant->adt[adt];
312 struct hash_net6_elem e = { .cidr = HOST_MASK };
313 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
314 int ret;
315
316 if (unlikely(!tb[IPSET_ATTR_IP] ||
317 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
318 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS) ||
319 !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
320 !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
321 return -IPSET_ERR_PROTOCOL;
322 if (unlikely(tb[IPSET_ATTR_IP_TO]))
323 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
324
325 if (tb[IPSET_ATTR_LINENO])
326 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
327
328 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) ||
329 ip_set_get_extensions(set, tb, &ext);
330 if (ret)
331 return ret;
332
333 if (tb[IPSET_ATTR_CIDR])
334 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
335
336 if (!e.cidr || e.cidr > HOST_MASK)
337 return -IPSET_ERR_INVALID_CIDR;
338
339 ip6_netmask(&e.ip, e.cidr);
340
341 if (tb[IPSET_ATTR_CADT_FLAGS]) {
342 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
343 if (cadt_flags & IPSET_FLAG_NOMATCH)
344 flags |= (IPSET_FLAG_NOMATCH << 16);
345 }
346
347 ret = adtfn(set, &e, &ext, &ext, flags);
348
349 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
350 ip_set_eexist(ret, flags) ? 0 : ret;
351}
352
353static struct ip_set_type hash_net_type __read_mostly = {
354 .name = "hash:net",
355 .protocol = IPSET_PROTOCOL,
356 .features = IPSET_TYPE_IP | IPSET_TYPE_NOMATCH,
357 .dimension = IPSET_DIM_ONE,
358 .family = NFPROTO_UNSPEC,
359 .revision_min = IPSET_TYPE_REV_MIN,
360 .revision_max = IPSET_TYPE_REV_MAX,
361 .create = hash_net_create,
362 .create_policy = {
363 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
364 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
365 [IPSET_ATTR_PROBES] = { .type = NLA_U8 },
366 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
367 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
368 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
369 },
370 .adt_policy = {
371 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
372 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
373 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
374 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
375 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
376 [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
377 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
378 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING },
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 ip_set_type_unregister(&hash_net_type);
393}
394
395module_init(hash_net_init);
396module_exit(hash_net_fini);
397
