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5d50e1d8 | 1 | /* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> |
b3837029 JK |
2 | * |
3 | * This program is free software; you can redistribute it and/or modify | |
4 | * it under the terms of the GNU General Public License version 2 as | |
5 | * published by the Free Software Foundation. | |
6 | */ | |
7 | ||
8 | /* Kernel module implementing an IP set type: the hash:net type */ | |
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> | |
b3837029 JK |
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> | |
b3837029 JK |
23 | #include <linux/netfilter/ipset/ip_set_hash.h> |
24 | ||
10111a6e JK |
25 | #define REVISION_MIN 0 |
26 | /* 1 Range as input support for IPv4 added */ | |
27 | #define REVISION_MAX 2 /* nomatch flag support added */ | |
28 | ||
b3837029 JK |
29 | MODULE_LICENSE("GPL"); |
30 | MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); | |
10111a6e | 31 | IP_SET_MODULE_DESC("hash:net", REVISION_MIN, REVISION_MAX); |
b3837029 JK |
32 | MODULE_ALIAS("ip_set_hash:net"); |
33 | ||
34 | /* Type specific function prefix */ | |
5d50e1d8 JK |
35 | #define HTYPE hash_net |
36 | #define IP_SET_HASH_WITH_NETS | |
b3837029 | 37 | |
5d50e1d8 | 38 | /* IPv4 variants */ |
b3837029 | 39 | |
5d50e1d8 | 40 | /* Member elements */ |
b3837029 JK |
41 | struct hash_net4_elem { |
42 | __be32 ip; | |
43 | u16 padding0; | |
2a7cef2a | 44 | u8 nomatch; |
b3837029 JK |
45 | u8 cidr; |
46 | }; | |
47 | ||
5d50e1d8 | 48 | struct hash_net4t_elem { |
b3837029 JK |
49 | __be32 ip; |
50 | u16 padding0; | |
2a7cef2a | 51 | u8 nomatch; |
b3837029 JK |
52 | u8 cidr; |
53 | unsigned long timeout; | |
54 | }; | |
55 | ||
5d50e1d8 JK |
56 | /* Common functions */ |
57 | ||
b3837029 JK |
58 | static inline bool |
59 | hash_net4_data_equal(const struct hash_net4_elem *ip1, | |
89dc79b7 JK |
60 | const struct hash_net4_elem *ip2, |
61 | u32 *multi) | |
b3837029 | 62 | { |
2a7cef2a JK |
63 | return ip1->ip == ip2->ip && |
64 | ip1->cidr == ip2->cidr; | |
b3837029 JK |
65 | } |
66 | ||
5d50e1d8 JK |
67 | static inline int |
68 | hash_net4_do_data_match(const struct hash_net4_elem *elem) | |
b3837029 | 69 | { |
5d50e1d8 | 70 | return elem->nomatch ? -ENOTEMPTY : 1; |
2a7cef2a JK |
71 | } |
72 | ||
73 | static inline void | |
5d50e1d8 | 74 | hash_net4_data_set_flags(struct hash_net4_elem *elem, u32 flags) |
2a7cef2a | 75 | { |
5d50e1d8 | 76 | elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH; |
6eb4c7e9 JK |
77 | } |
78 | ||
79 | static inline void | |
5d50e1d8 | 80 | hash_net4_data_reset_flags(struct hash_net4_elem *elem, u8 *flags) |
2a7cef2a | 81 | { |
5d50e1d8 | 82 | swap(*flags, elem->nomatch); |
b3837029 JK |
83 | } |
84 | ||
85 | static inline void | |
86 | hash_net4_data_netmask(struct hash_net4_elem *elem, u8 cidr) | |
87 | { | |
88 | elem->ip &= ip_set_netmask(cidr); | |
89 | elem->cidr = cidr; | |
90 | } | |
91 | ||
b3837029 JK |
92 | static bool |
93 | hash_net4_data_list(struct sk_buff *skb, const struct hash_net4_elem *data) | |
94 | { | |
2a7cef2a JK |
95 | u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0; |
96 | ||
7cf7899d DM |
97 | if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) || |
98 | nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) || | |
99 | (flags && | |
100 | nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags)))) | |
101 | goto nla_put_failure; | |
b3837029 JK |
102 | return 0; |
103 | ||
104 | nla_put_failure: | |
105 | return 1; | |
106 | } | |
107 | ||
5d50e1d8 JK |
108 | static inline void |
109 | hash_net4_data_next(struct hash_net4_elem *next, | |
110 | const struct hash_net4_elem *d) | |
b3837029 | 111 | { |
5d50e1d8 | 112 | next->ip = d->ip; |
b3837029 JK |
113 | } |
114 | ||
5d50e1d8 | 115 | #define MTYPE hash_net4 |
b3837029 JK |
116 | #define PF 4 |
117 | #define HOST_MASK 32 | |
5d50e1d8 | 118 | #include "ip_set_hash_gen.h" |
3d14b171 | 119 | |
b3837029 JK |
120 | static int |
121 | hash_net4_kadt(struct ip_set *set, const struct sk_buff *skb, | |
b66554cf | 122 | const struct xt_action_param *par, |
5d50e1d8 | 123 | enum ipset_adt adt, struct ip_set_adt_opt *opt) |
b3837029 | 124 | { |
5d50e1d8 | 125 | const struct hash_net *h = set->data; |
b3837029 | 126 | ipset_adtfn adtfn = set->variant->adt[adt]; |
5d50e1d8 | 127 | struct hash_net4_elem e = { |
9b03a5ef JK |
128 | .cidr = h->nets[0].cidr ? h->nets[0].cidr : HOST_MASK |
129 | }; | |
5d50e1d8 | 130 | struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, h); |
b3837029 | 131 | |
5d50e1d8 | 132 | if (e.cidr == 0) |
b3837029 JK |
133 | return -EINVAL; |
134 | if (adt == IPSET_TEST) | |
5d50e1d8 | 135 | e.cidr = HOST_MASK; |
b3837029 | 136 | |
5d50e1d8 JK |
137 | ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip); |
138 | e.ip &= ip_set_netmask(e.cidr); | |
b3837029 | 139 | |
5d50e1d8 | 140 | return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); |
b3837029 JK |
141 | } |
142 | ||
143 | static int | |
144 | hash_net4_uadt(struct ip_set *set, struct nlattr *tb[], | |
3d14b171 | 145 | enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) |
b3837029 | 146 | { |
5d50e1d8 | 147 | const struct hash_net *h = set->data; |
b3837029 | 148 | ipset_adtfn adtfn = set->variant->adt[adt]; |
5d50e1d8 JK |
149 | struct hash_net4_elem e = { .cidr = HOST_MASK }; |
150 | struct ip_set_ext ext = IP_SET_INIT_UEXT(h); | |
d0d9e0a5 | 151 | u32 ip = 0, ip_to, last; |
b3837029 JK |
152 | int ret; |
153 | ||
154 | if (unlikely(!tb[IPSET_ATTR_IP] || | |
2a7cef2a JK |
155 | !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || |
156 | !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) | |
b3837029 JK |
157 | return -IPSET_ERR_PROTOCOL; |
158 | ||
159 | if (tb[IPSET_ATTR_LINENO]) | |
160 | *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); | |
161 | ||
5d50e1d8 JK |
162 | ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip) || |
163 | ip_set_get_extensions(set, tb, &ext); | |
b3837029 JK |
164 | if (ret) |
165 | return ret; | |
166 | ||
d0d9e0a5 | 167 | if (tb[IPSET_ATTR_CIDR]) { |
5d50e1d8 JK |
168 | e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); |
169 | if (!e.cidr || e.cidr > HOST_MASK) | |
d0d9e0a5 JK |
170 | return -IPSET_ERR_INVALID_CIDR; |
171 | } | |
b3837029 | 172 | |
43c56e59 | 173 | if (tb[IPSET_ATTR_CADT_FLAGS]) { |
2a7cef2a JK |
174 | u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); |
175 | if (cadt_flags & IPSET_FLAG_NOMATCH) | |
43c56e59 | 176 | flags |= (IPSET_FLAG_NOMATCH << 16); |
2a7cef2a JK |
177 | } |
178 | ||
d0d9e0a5 | 179 | if (adt == IPSET_TEST || !tb[IPSET_ATTR_IP_TO]) { |
5d50e1d8 JK |
180 | e.ip = htonl(ip & ip_set_hostmask(e.cidr)); |
181 | ret = adtfn(set, &e, &ext, &ext, flags); | |
43c56e59 JK |
182 | return ip_set_enomatch(ret, flags, adt) ? 1 : |
183 | ip_set_eexist(ret, flags) ? 0 : ret; | |
d0d9e0a5 | 184 | } |
b3837029 | 185 | |
d0d9e0a5 JK |
186 | ip_to = ip; |
187 | if (tb[IPSET_ATTR_IP_TO]) { | |
188 | ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to); | |
189 | if (ret) | |
190 | return ret; | |
191 | if (ip_to < ip) | |
192 | swap(ip, ip_to); | |
193 | if (ip + UINT_MAX == ip_to) | |
194 | return -IPSET_ERR_HASH_RANGE; | |
195 | } | |
196 | if (retried) | |
6e27c9b4 | 197 | ip = ntohl(h->next.ip); |
d0d9e0a5 | 198 | while (!after(ip, ip_to)) { |
5d50e1d8 JK |
199 | e.ip = htonl(ip); |
200 | last = ip_set_range_to_cidr(ip, ip_to, &e.cidr); | |
201 | ret = adtfn(set, &e, &ext, &ext, flags); | |
d0d9e0a5 JK |
202 | if (ret && !ip_set_eexist(ret, flags)) |
203 | return ret; | |
204 | else | |
205 | ret = 0; | |
206 | ip = last + 1; | |
207 | } | |
208 | return ret; | |
b3837029 JK |
209 | } |
210 | ||
5d50e1d8 | 211 | /* IPv6 variants */ |
b3837029 JK |
212 | |
213 | struct hash_net6_elem { | |
214 | union nf_inet_addr ip; | |
215 | u16 padding0; | |
2a7cef2a | 216 | u8 nomatch; |
b3837029 JK |
217 | u8 cidr; |
218 | }; | |
219 | ||
5d50e1d8 | 220 | struct hash_net6t_elem { |
b3837029 JK |
221 | union nf_inet_addr ip; |
222 | u16 padding0; | |
2a7cef2a | 223 | u8 nomatch; |
b3837029 JK |
224 | u8 cidr; |
225 | unsigned long timeout; | |
226 | }; | |
227 | ||
5d50e1d8 JK |
228 | /* Common functions */ |
229 | ||
b3837029 JK |
230 | static inline bool |
231 | hash_net6_data_equal(const struct hash_net6_elem *ip1, | |
89dc79b7 JK |
232 | const struct hash_net6_elem *ip2, |
233 | u32 *multi) | |
b3837029 | 234 | { |
29e3b160 | 235 | return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) && |
b3837029 JK |
236 | ip1->cidr == ip2->cidr; |
237 | } | |
238 | ||
5d50e1d8 JK |
239 | static inline int |
240 | hash_net6_do_data_match(const struct hash_net6_elem *elem) | |
2a7cef2a | 241 | { |
5d50e1d8 | 242 | return elem->nomatch ? -ENOTEMPTY : 1; |
6eb4c7e9 JK |
243 | } |
244 | ||
245 | static inline void | |
5d50e1d8 | 246 | hash_net6_data_set_flags(struct hash_net6_elem *elem, u32 flags) |
2a7cef2a | 247 | { |
5d50e1d8 | 248 | elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH; |
b3837029 JK |
249 | } |
250 | ||
251 | static inline void | |
5d50e1d8 | 252 | hash_net6_data_reset_flags(struct hash_net6_elem *elem, u8 *flags) |
b3837029 | 253 | { |
5d50e1d8 | 254 | swap(*flags, elem->nomatch); |
b3837029 JK |
255 | } |
256 | ||
b3837029 JK |
257 | static inline void |
258 | hash_net6_data_netmask(struct hash_net6_elem *elem, u8 cidr) | |
259 | { | |
260 | ip6_netmask(&elem->ip, cidr); | |
261 | elem->cidr = cidr; | |
262 | } | |
263 | ||
264 | static bool | |
265 | hash_net6_data_list(struct sk_buff *skb, const struct hash_net6_elem *data) | |
266 | { | |
2a7cef2a JK |
267 | u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0; |
268 | ||
7cf7899d DM |
269 | if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) || |
270 | nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) || | |
271 | (flags && | |
272 | nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags)))) | |
273 | goto nla_put_failure; | |
b3837029 JK |
274 | return 0; |
275 | ||
276 | nla_put_failure: | |
277 | return 1; | |
278 | } | |
279 | ||
5d50e1d8 JK |
280 | static inline void |
281 | hash_net6_data_next(struct hash_net4_elem *next, | |
282 | const struct hash_net6_elem *d) | |
b3837029 | 283 | { |
b3837029 JK |
284 | } |
285 | ||
5d50e1d8 | 286 | #undef MTYPE |
b3837029 JK |
287 | #undef PF |
288 | #undef HOST_MASK | |
289 | ||
5d50e1d8 | 290 | #define MTYPE hash_net6 |
b3837029 JK |
291 | #define PF 6 |
292 | #define HOST_MASK 128 | |
5d50e1d8 JK |
293 | #define IP_SET_EMIT_CREATE |
294 | #include "ip_set_hash_gen.h" | |
3d14b171 | 295 | |
b3837029 JK |
296 | static int |
297 | hash_net6_kadt(struct ip_set *set, const struct sk_buff *skb, | |
b66554cf | 298 | const struct xt_action_param *par, |
5d50e1d8 | 299 | enum ipset_adt adt, struct ip_set_adt_opt *opt) |
b3837029 | 300 | { |
5d50e1d8 | 301 | const struct hash_net *h = set->data; |
b3837029 | 302 | ipset_adtfn adtfn = set->variant->adt[adt]; |
5d50e1d8 | 303 | struct hash_net6_elem e = { |
9b03a5ef JK |
304 | .cidr = h->nets[0].cidr ? h->nets[0].cidr : HOST_MASK |
305 | }; | |
5d50e1d8 | 306 | struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, h); |
b3837029 | 307 | |
5d50e1d8 | 308 | if (e.cidr == 0) |
b3837029 JK |
309 | return -EINVAL; |
310 | if (adt == IPSET_TEST) | |
5d50e1d8 | 311 | e.cidr = HOST_MASK; |
b3837029 | 312 | |
5d50e1d8 JK |
313 | ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6); |
314 | ip6_netmask(&e.ip, e.cidr); | |
b3837029 | 315 | |
5d50e1d8 | 316 | return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); |
b3837029 JK |
317 | } |
318 | ||
319 | static int | |
320 | hash_net6_uadt(struct ip_set *set, struct nlattr *tb[], | |
3d14b171 | 321 | enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) |
b3837029 | 322 | { |
5d50e1d8 | 323 | const struct hash_net *h = set->data; |
b3837029 | 324 | ipset_adtfn adtfn = set->variant->adt[adt]; |
5d50e1d8 JK |
325 | struct hash_net6_elem e = { .cidr = HOST_MASK }; |
326 | struct ip_set_ext ext = IP_SET_INIT_UEXT(h); | |
b3837029 JK |
327 | int ret; |
328 | ||
329 | if (unlikely(!tb[IPSET_ATTR_IP] || | |
2a7cef2a JK |
330 | !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || |
331 | !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) | |
b3837029 | 332 | return -IPSET_ERR_PROTOCOL; |
d0d9e0a5 JK |
333 | if (unlikely(tb[IPSET_ATTR_IP_TO])) |
334 | return -IPSET_ERR_HASH_RANGE_UNSUPPORTED; | |
b3837029 JK |
335 | |
336 | if (tb[IPSET_ATTR_LINENO]) | |
337 | *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); | |
338 | ||
5d50e1d8 JK |
339 | ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) || |
340 | ip_set_get_extensions(set, tb, &ext); | |
b3837029 JK |
341 | if (ret) |
342 | return ret; | |
343 | ||
344 | if (tb[IPSET_ATTR_CIDR]) | |
5d50e1d8 | 345 | e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); |
b3837029 | 346 | |
5d50e1d8 | 347 | if (!e.cidr || e.cidr > HOST_MASK) |
b3837029 JK |
348 | return -IPSET_ERR_INVALID_CIDR; |
349 | ||
5d50e1d8 | 350 | ip6_netmask(&e.ip, e.cidr); |
b3837029 | 351 | |
43c56e59 | 352 | if (tb[IPSET_ATTR_CADT_FLAGS]) { |
2a7cef2a JK |
353 | u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); |
354 | if (cadt_flags & IPSET_FLAG_NOMATCH) | |
43c56e59 | 355 | flags |= (IPSET_FLAG_NOMATCH << 16); |
2a7cef2a JK |
356 | } |
357 | ||
5d50e1d8 | 358 | ret = adtfn(set, &e, &ext, &ext, flags); |
b3837029 | 359 | |
43c56e59 JK |
360 | return ip_set_enomatch(ret, flags, adt) ? 1 : |
361 | ip_set_eexist(ret, flags) ? 0 : ret; | |
b3837029 JK |
362 | } |
363 | ||
b3837029 JK |
364 | static struct ip_set_type hash_net_type __read_mostly = { |
365 | .name = "hash:net", | |
366 | .protocol = IPSET_PROTOCOL, | |
3e0304a5 | 367 | .features = IPSET_TYPE_IP | IPSET_TYPE_NOMATCH, |
b3837029 | 368 | .dimension = IPSET_DIM_ONE, |
c15f1c83 | 369 | .family = NFPROTO_UNSPEC, |
10111a6e JK |
370 | .revision_min = REVISION_MIN, |
371 | .revision_max = REVISION_MAX, | |
b3837029 JK |
372 | .create = hash_net_create, |
373 | .create_policy = { | |
374 | [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, | |
375 | [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, | |
376 | [IPSET_ATTR_PROBES] = { .type = NLA_U8 }, | |
377 | [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, | |
378 | [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, | |
5d50e1d8 | 379 | [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, |
b3837029 JK |
380 | }, |
381 | .adt_policy = { | |
382 | [IPSET_ATTR_IP] = { .type = NLA_NESTED }, | |
d0d9e0a5 | 383 | [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, |
b3837029 JK |
384 | [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, |
385 | [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, | |
2a7cef2a | 386 | [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, |
b3837029 JK |
387 | }, |
388 | .me = THIS_MODULE, | |
389 | }; | |
390 | ||
391 | static int __init | |
392 | hash_net_init(void) | |
393 | { | |
394 | return ip_set_type_register(&hash_net_type); | |
395 | } | |
396 | ||
397 | static void __exit | |
398 | hash_net_fini(void) | |
399 | { | |
400 | ip_set_type_unregister(&hash_net_type); | |
401 | } | |
402 | ||
403 | module_init(hash_net_init); | |
404 | module_exit(hash_net_fini); |