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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 | ||
35b8dcf8 JK |
25 | #define IPSET_TYPE_REV_MIN 0 |
26 | /* 1 Range as input support for IPv4 added */ | |
27 | /* 2 nomatch flag support added */ | |
28 | #define IPSET_TYPE_REV_MAX 3 /* Counters support added */ | |
10111a6e | 29 | |
b3837029 JK |
30 | MODULE_LICENSE("GPL"); |
31 | MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); | |
35b8dcf8 | 32 | IP_SET_MODULE_DESC("hash:net", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); |
b3837029 JK |
33 | MODULE_ALIAS("ip_set_hash:net"); |
34 | ||
35 | /* Type specific function prefix */ | |
5d50e1d8 JK |
36 | #define HTYPE hash_net |
37 | #define IP_SET_HASH_WITH_NETS | |
b3837029 | 38 | |
03c8b234 | 39 | /* IPv4 variant */ |
b3837029 | 40 | |
5d50e1d8 | 41 | /* Member elements */ |
b3837029 JK |
42 | struct hash_net4_elem { |
43 | __be32 ip; | |
44 | u16 padding0; | |
2a7cef2a | 45 | u8 nomatch; |
b3837029 JK |
46 | u8 cidr; |
47 | }; | |
48 | ||
5d50e1d8 JK |
49 | /* Common functions */ |
50 | ||
b3837029 JK |
51 | static inline bool |
52 | hash_net4_data_equal(const struct hash_net4_elem *ip1, | |
89dc79b7 JK |
53 | const struct hash_net4_elem *ip2, |
54 | u32 *multi) | |
b3837029 | 55 | { |
2a7cef2a JK |
56 | return ip1->ip == ip2->ip && |
57 | ip1->cidr == ip2->cidr; | |
b3837029 JK |
58 | } |
59 | ||
5d50e1d8 JK |
60 | static inline int |
61 | hash_net4_do_data_match(const struct hash_net4_elem *elem) | |
b3837029 | 62 | { |
5d50e1d8 | 63 | return elem->nomatch ? -ENOTEMPTY : 1; |
2a7cef2a JK |
64 | } |
65 | ||
66 | static inline void | |
5d50e1d8 | 67 | hash_net4_data_set_flags(struct hash_net4_elem *elem, u32 flags) |
2a7cef2a | 68 | { |
5d50e1d8 | 69 | elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH; |
6eb4c7e9 JK |
70 | } |
71 | ||
72 | static inline void | |
5d50e1d8 | 73 | hash_net4_data_reset_flags(struct hash_net4_elem *elem, u8 *flags) |
2a7cef2a | 74 | { |
5d50e1d8 | 75 | swap(*flags, elem->nomatch); |
b3837029 JK |
76 | } |
77 | ||
78 | static inline void | |
79 | hash_net4_data_netmask(struct hash_net4_elem *elem, u8 cidr) | |
80 | { | |
81 | elem->ip &= ip_set_netmask(cidr); | |
82 | elem->cidr = cidr; | |
83 | } | |
84 | ||
b3837029 JK |
85 | static bool |
86 | hash_net4_data_list(struct sk_buff *skb, const struct hash_net4_elem *data) | |
87 | { | |
2a7cef2a JK |
88 | u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0; |
89 | ||
7cf7899d DM |
90 | if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) || |
91 | nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) || | |
92 | (flags && | |
93 | nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags)))) | |
94 | goto nla_put_failure; | |
b3837029 JK |
95 | return 0; |
96 | ||
97 | nla_put_failure: | |
98 | return 1; | |
99 | } | |
100 | ||
5d50e1d8 JK |
101 | static inline void |
102 | hash_net4_data_next(struct hash_net4_elem *next, | |
103 | const struct hash_net4_elem *d) | |
b3837029 | 104 | { |
5d50e1d8 | 105 | next->ip = d->ip; |
b3837029 JK |
106 | } |
107 | ||
5d50e1d8 | 108 | #define MTYPE hash_net4 |
b3837029 JK |
109 | #define PF 4 |
110 | #define HOST_MASK 32 | |
5d50e1d8 | 111 | #include "ip_set_hash_gen.h" |
3d14b171 | 112 | |
b3837029 JK |
113 | static int |
114 | hash_net4_kadt(struct ip_set *set, const struct sk_buff *skb, | |
b66554cf | 115 | const struct xt_action_param *par, |
5d50e1d8 | 116 | enum ipset_adt adt, struct ip_set_adt_opt *opt) |
b3837029 | 117 | { |
5d50e1d8 | 118 | const struct hash_net *h = set->data; |
b3837029 | 119 | ipset_adtfn adtfn = set->variant->adt[adt]; |
5d50e1d8 | 120 | struct hash_net4_elem e = { |
a04d8b6b | 121 | .cidr = IP_SET_INIT_CIDR(h->nets[0].cidr[0], HOST_MASK), |
9b03a5ef | 122 | }; |
ca134ce8 | 123 | struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); |
b3837029 | 124 | |
5d50e1d8 | 125 | if (e.cidr == 0) |
b3837029 JK |
126 | return -EINVAL; |
127 | if (adt == IPSET_TEST) | |
5d50e1d8 | 128 | e.cidr = HOST_MASK; |
b3837029 | 129 | |
5d50e1d8 JK |
130 | ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip); |
131 | e.ip &= ip_set_netmask(e.cidr); | |
b3837029 | 132 | |
5d50e1d8 | 133 | return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); |
b3837029 JK |
134 | } |
135 | ||
136 | static int | |
137 | hash_net4_uadt(struct ip_set *set, struct nlattr *tb[], | |
3d14b171 | 138 | enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) |
b3837029 | 139 | { |
5d50e1d8 | 140 | const struct hash_net *h = set->data; |
b3837029 | 141 | ipset_adtfn adtfn = set->variant->adt[adt]; |
5d50e1d8 | 142 | struct hash_net4_elem e = { .cidr = HOST_MASK }; |
ca134ce8 | 143 | struct ip_set_ext ext = IP_SET_INIT_UEXT(set); |
20b2fab4 | 144 | u32 ip = 0, ip_to = 0, last; |
b3837029 JK |
145 | int ret; |
146 | ||
147 | if (unlikely(!tb[IPSET_ATTR_IP] || | |
2a7cef2a | 148 | !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || |
00d71b27 JK |
149 | !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS) || |
150 | !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) || | |
151 | !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES))) | |
b3837029 JK |
152 | return -IPSET_ERR_PROTOCOL; |
153 | ||
154 | if (tb[IPSET_ATTR_LINENO]) | |
155 | *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); | |
156 | ||
5d50e1d8 JK |
157 | ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip) || |
158 | ip_set_get_extensions(set, tb, &ext); | |
b3837029 JK |
159 | if (ret) |
160 | return ret; | |
161 | ||
d0d9e0a5 | 162 | if (tb[IPSET_ATTR_CIDR]) { |
5d50e1d8 JK |
163 | e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); |
164 | if (!e.cidr || e.cidr > HOST_MASK) | |
d0d9e0a5 JK |
165 | return -IPSET_ERR_INVALID_CIDR; |
166 | } | |
b3837029 | 167 | |
43c56e59 | 168 | if (tb[IPSET_ATTR_CADT_FLAGS]) { |
2a7cef2a JK |
169 | u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); |
170 | if (cadt_flags & IPSET_FLAG_NOMATCH) | |
43c56e59 | 171 | flags |= (IPSET_FLAG_NOMATCH << 16); |
2a7cef2a JK |
172 | } |
173 | ||
d0d9e0a5 | 174 | if (adt == IPSET_TEST || !tb[IPSET_ATTR_IP_TO]) { |
5d50e1d8 JK |
175 | e.ip = htonl(ip & ip_set_hostmask(e.cidr)); |
176 | ret = adtfn(set, &e, &ext, &ext, flags); | |
0f1799ba | 177 | return ip_set_enomatch(ret, flags, adt, set) ? -ret: |
43c56e59 | 178 | ip_set_eexist(ret, flags) ? 0 : ret; |
d0d9e0a5 | 179 | } |
b3837029 | 180 | |
d0d9e0a5 JK |
181 | ip_to = ip; |
182 | if (tb[IPSET_ATTR_IP_TO]) { | |
183 | ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to); | |
184 | if (ret) | |
185 | return ret; | |
186 | if (ip_to < ip) | |
187 | swap(ip, ip_to); | |
188 | if (ip + UINT_MAX == ip_to) | |
189 | return -IPSET_ERR_HASH_RANGE; | |
190 | } | |
191 | if (retried) | |
6e27c9b4 | 192 | ip = ntohl(h->next.ip); |
d0d9e0a5 | 193 | while (!after(ip, ip_to)) { |
5d50e1d8 JK |
194 | e.ip = htonl(ip); |
195 | last = ip_set_range_to_cidr(ip, ip_to, &e.cidr); | |
196 | ret = adtfn(set, &e, &ext, &ext, flags); | |
d0d9e0a5 JK |
197 | if (ret && !ip_set_eexist(ret, flags)) |
198 | return ret; | |
199 | else | |
200 | ret = 0; | |
201 | ip = last + 1; | |
202 | } | |
203 | return ret; | |
b3837029 JK |
204 | } |
205 | ||
03c8b234 | 206 | /* IPv6 variant */ |
b3837029 JK |
207 | |
208 | struct hash_net6_elem { | |
209 | union nf_inet_addr ip; | |
210 | u16 padding0; | |
2a7cef2a | 211 | u8 nomatch; |
b3837029 JK |
212 | u8 cidr; |
213 | }; | |
214 | ||
5d50e1d8 JK |
215 | /* Common functions */ |
216 | ||
b3837029 JK |
217 | static inline bool |
218 | hash_net6_data_equal(const struct hash_net6_elem *ip1, | |
89dc79b7 JK |
219 | const struct hash_net6_elem *ip2, |
220 | u32 *multi) | |
b3837029 | 221 | { |
29e3b160 | 222 | return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) && |
b3837029 JK |
223 | ip1->cidr == ip2->cidr; |
224 | } | |
225 | ||
5d50e1d8 JK |
226 | static inline int |
227 | hash_net6_do_data_match(const struct hash_net6_elem *elem) | |
2a7cef2a | 228 | { |
5d50e1d8 | 229 | return elem->nomatch ? -ENOTEMPTY : 1; |
6eb4c7e9 JK |
230 | } |
231 | ||
232 | static inline void | |
5d50e1d8 | 233 | hash_net6_data_set_flags(struct hash_net6_elem *elem, u32 flags) |
2a7cef2a | 234 | { |
5d50e1d8 | 235 | elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH; |
b3837029 JK |
236 | } |
237 | ||
238 | static inline void | |
5d50e1d8 | 239 | hash_net6_data_reset_flags(struct hash_net6_elem *elem, u8 *flags) |
b3837029 | 240 | { |
5d50e1d8 | 241 | swap(*flags, elem->nomatch); |
b3837029 JK |
242 | } |
243 | ||
b3837029 JK |
244 | static inline void |
245 | hash_net6_data_netmask(struct hash_net6_elem *elem, u8 cidr) | |
246 | { | |
247 | ip6_netmask(&elem->ip, cidr); | |
248 | elem->cidr = cidr; | |
249 | } | |
250 | ||
251 | static bool | |
252 | hash_net6_data_list(struct sk_buff *skb, const struct hash_net6_elem *data) | |
253 | { | |
2a7cef2a JK |
254 | u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0; |
255 | ||
7cf7899d DM |
256 | if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) || |
257 | nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) || | |
258 | (flags && | |
259 | nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags)))) | |
260 | goto nla_put_failure; | |
b3837029 JK |
261 | return 0; |
262 | ||
263 | nla_put_failure: | |
264 | return 1; | |
265 | } | |
266 | ||
5d50e1d8 JK |
267 | static inline void |
268 | hash_net6_data_next(struct hash_net4_elem *next, | |
269 | const struct hash_net6_elem *d) | |
b3837029 | 270 | { |
b3837029 JK |
271 | } |
272 | ||
5d50e1d8 | 273 | #undef MTYPE |
b3837029 JK |
274 | #undef PF |
275 | #undef HOST_MASK | |
276 | ||
5d50e1d8 | 277 | #define MTYPE hash_net6 |
b3837029 JK |
278 | #define PF 6 |
279 | #define HOST_MASK 128 | |
5d50e1d8 JK |
280 | #define IP_SET_EMIT_CREATE |
281 | #include "ip_set_hash_gen.h" | |
3d14b171 | 282 | |
b3837029 JK |
283 | static int |
284 | hash_net6_kadt(struct ip_set *set, const struct sk_buff *skb, | |
b66554cf | 285 | const struct xt_action_param *par, |
5d50e1d8 | 286 | enum ipset_adt adt, struct ip_set_adt_opt *opt) |
b3837029 | 287 | { |
5d50e1d8 | 288 | const struct hash_net *h = set->data; |
b3837029 | 289 | ipset_adtfn adtfn = set->variant->adt[adt]; |
5d50e1d8 | 290 | struct hash_net6_elem e = { |
a04d8b6b | 291 | .cidr = IP_SET_INIT_CIDR(h->nets[0].cidr[0], HOST_MASK), |
9b03a5ef | 292 | }; |
ca134ce8 | 293 | struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); |
b3837029 | 294 | |
5d50e1d8 | 295 | if (e.cidr == 0) |
b3837029 JK |
296 | return -EINVAL; |
297 | if (adt == IPSET_TEST) | |
5d50e1d8 | 298 | e.cidr = HOST_MASK; |
b3837029 | 299 | |
5d50e1d8 JK |
300 | ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6); |
301 | ip6_netmask(&e.ip, e.cidr); | |
b3837029 | 302 | |
5d50e1d8 | 303 | return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); |
b3837029 JK |
304 | } |
305 | ||
306 | static int | |
307 | hash_net6_uadt(struct ip_set *set, struct nlattr *tb[], | |
3d14b171 | 308 | enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) |
b3837029 | 309 | { |
b3837029 | 310 | ipset_adtfn adtfn = set->variant->adt[adt]; |
5d50e1d8 | 311 | struct hash_net6_elem e = { .cidr = HOST_MASK }; |
ca134ce8 | 312 | struct ip_set_ext ext = IP_SET_INIT_UEXT(set); |
b3837029 JK |
313 | int ret; |
314 | ||
315 | if (unlikely(!tb[IPSET_ATTR_IP] || | |
2a7cef2a | 316 | !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || |
00d71b27 JK |
317 | !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS) || |
318 | !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) || | |
319 | !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES))) | |
b3837029 | 320 | return -IPSET_ERR_PROTOCOL; |
d0d9e0a5 JK |
321 | if (unlikely(tb[IPSET_ATTR_IP_TO])) |
322 | return -IPSET_ERR_HASH_RANGE_UNSUPPORTED; | |
b3837029 JK |
323 | |
324 | if (tb[IPSET_ATTR_LINENO]) | |
325 | *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); | |
326 | ||
5d50e1d8 JK |
327 | ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) || |
328 | ip_set_get_extensions(set, tb, &ext); | |
b3837029 JK |
329 | if (ret) |
330 | return ret; | |
331 | ||
332 | if (tb[IPSET_ATTR_CIDR]) | |
5d50e1d8 | 333 | e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); |
b3837029 | 334 | |
5d50e1d8 | 335 | if (!e.cidr || e.cidr > HOST_MASK) |
b3837029 JK |
336 | return -IPSET_ERR_INVALID_CIDR; |
337 | ||
5d50e1d8 | 338 | ip6_netmask(&e.ip, e.cidr); |
b3837029 | 339 | |
43c56e59 | 340 | if (tb[IPSET_ATTR_CADT_FLAGS]) { |
2a7cef2a JK |
341 | u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); |
342 | if (cadt_flags & IPSET_FLAG_NOMATCH) | |
43c56e59 | 343 | flags |= (IPSET_FLAG_NOMATCH << 16); |
2a7cef2a JK |
344 | } |
345 | ||
5d50e1d8 | 346 | ret = adtfn(set, &e, &ext, &ext, flags); |
b3837029 | 347 | |
0f1799ba | 348 | return ip_set_enomatch(ret, flags, adt, set) ? -ret : |
43c56e59 | 349 | ip_set_eexist(ret, flags) ? 0 : ret; |
b3837029 JK |
350 | } |
351 | ||
b3837029 JK |
352 | static struct ip_set_type hash_net_type __read_mostly = { |
353 | .name = "hash:net", | |
354 | .protocol = IPSET_PROTOCOL, | |
3e0304a5 | 355 | .features = IPSET_TYPE_IP | IPSET_TYPE_NOMATCH, |
b3837029 | 356 | .dimension = IPSET_DIM_ONE, |
c15f1c83 | 357 | .family = NFPROTO_UNSPEC, |
35b8dcf8 JK |
358 | .revision_min = IPSET_TYPE_REV_MIN, |
359 | .revision_max = IPSET_TYPE_REV_MAX, | |
b3837029 JK |
360 | .create = hash_net_create, |
361 | .create_policy = { | |
362 | [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, | |
363 | [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, | |
364 | [IPSET_ATTR_PROBES] = { .type = NLA_U8 }, | |
365 | [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, | |
366 | [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, | |
5d50e1d8 | 367 | [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, |
b3837029 JK |
368 | }, |
369 | .adt_policy = { | |
370 | [IPSET_ATTR_IP] = { .type = NLA_NESTED }, | |
d0d9e0a5 | 371 | [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, |
b3837029 JK |
372 | [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, |
373 | [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, | |
2a7cef2a | 374 | [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, |
00d71b27 JK |
375 | [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, |
376 | [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, | |
b3837029 JK |
377 | }, |
378 | .me = THIS_MODULE, | |
379 | }; | |
380 | ||
381 | static int __init | |
382 | hash_net_init(void) | |
383 | { | |
384 | return ip_set_type_register(&hash_net_type); | |
385 | } | |
386 | ||
387 | static void __exit | |
388 | hash_net_fini(void) | |
389 | { | |
390 | ip_set_type_unregister(&hash_net_type); | |
391 | } | |
392 | ||
393 | module_init(hash_net_init); | |
394 | module_exit(hash_net_fini); |