1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@netfilter.org> */ |
3 | |
4 | /* Kernel module implementing an IP set type: the hash:net type */ |
5 | |
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 | /* 1 Range as input support for IPv4 added */ |
23 | /* 2 nomatch flag support added */ |
24 | /* 3 Counters support added */ |
25 | /* 4 Comments support added */ |
26 | /* 5 Forceadd support added */ |
27 | /* 6 skbinfo support added */ |
28 | #define IPSET_TYPE_REV_MAX 7 /* bucketsize, initval support added */ |
29 | |
30 | MODULE_LICENSE("GPL" ); |
31 | MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>" ); |
32 | IP_SET_MODULE_DESC("hash:net" , IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); |
33 | MODULE_ALIAS("ip_set_hash:net" ); |
34 | |
35 | /* Type specific function prefix */ |
36 | #define HTYPE hash_net |
37 | #define IP_SET_HASH_WITH_NETS |
38 | |
39 | /* IPv4 variant */ |
40 | |
41 | /* Member elements */ |
42 | struct hash_net4_elem { |
43 | __be32 ip; |
44 | u16 padding0; |
45 | u8 nomatch; |
46 | u8 cidr; |
47 | }; |
48 | |
49 | /* Common functions */ |
50 | |
51 | static bool |
52 | hash_net4_data_equal(const struct hash_net4_elem *ip1, |
53 | const struct hash_net4_elem *ip2, |
54 | u32 *multi) |
55 | { |
56 | return ip1->ip == ip2->ip && |
57 | ip1->cidr == ip2->cidr; |
58 | } |
59 | |
60 | static int |
61 | hash_net4_do_data_match(const struct hash_net4_elem *elem) |
62 | { |
63 | return elem->nomatch ? -ENOTEMPTY : 1; |
64 | } |
65 | |
66 | static void |
67 | hash_net4_data_set_flags(struct hash_net4_elem *elem, u32 flags) |
68 | { |
69 | elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH; |
70 | } |
71 | |
72 | static void |
73 | hash_net4_data_reset_flags(struct hash_net4_elem *elem, u8 *flags) |
74 | { |
75 | swap(*flags, elem->nomatch); |
76 | } |
77 | |
78 | static void |
79 | hash_net4_data_netmask(struct hash_net4_elem *elem, u8 cidr) |
80 | { |
81 | elem->ip &= ip_set_netmask(pfxlen: cidr); |
82 | elem->cidr = cidr; |
83 | } |
84 | |
85 | static bool |
86 | hash_net4_data_list(struct sk_buff *skb, const struct hash_net4_elem *data) |
87 | { |
88 | u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0; |
89 | |
90 | if (nla_put_ipaddr4(skb, type: IPSET_ATTR_IP, ipaddr: data->ip) || |
91 | nla_put_u8(skb, attrtype: IPSET_ATTR_CIDR, value: data->cidr) || |
92 | (flags && |
93 | nla_put_net32(skb, attrtype: IPSET_ATTR_CADT_FLAGS, htonl(flags)))) |
94 | goto nla_put_failure; |
95 | return false; |
96 | |
97 | nla_put_failure: |
98 | return true; |
99 | } |
100 | |
101 | static void |
102 | hash_net4_data_next(struct hash_net4_elem *next, |
103 | const struct hash_net4_elem *d) |
104 | { |
105 | next->ip = d->ip; |
106 | } |
107 | |
108 | #define MTYPE hash_net4 |
109 | #define HOST_MASK 32 |
110 | #include "ip_set_hash_gen.h" |
111 | |
112 | static int |
113 | hash_net4_kadt(struct ip_set *set, const struct sk_buff *skb, |
114 | const struct xt_action_param *par, |
115 | enum ipset_adt adt, struct ip_set_adt_opt *opt) |
116 | { |
117 | const struct hash_net4 *h = set->data; |
118 | ipset_adtfn adtfn = set->variant->adt[adt]; |
119 | struct hash_net4_elem e = { |
120 | .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK), |
121 | }; |
122 | struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); |
123 | |
124 | if (e.cidr == 0) |
125 | return -EINVAL; |
126 | if (adt == IPSET_TEST) |
127 | e.cidr = HOST_MASK; |
128 | |
129 | ip4addrptr(skb, src: opt->flags & IPSET_DIM_ONE_SRC, addr: &e.ip); |
130 | e.ip &= ip_set_netmask(pfxlen: e.cidr); |
131 | |
132 | return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); |
133 | } |
134 | |
135 | static int |
136 | hash_net4_uadt(struct ip_set *set, struct nlattr *tb[], |
137 | enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) |
138 | { |
139 | struct hash_net4 *h = set->data; |
140 | ipset_adtfn adtfn = set->variant->adt[adt]; |
141 | struct hash_net4_elem e = { .cidr = HOST_MASK }; |
142 | struct ip_set_ext ext = IP_SET_INIT_UEXT(set); |
143 | u32 ip = 0, ip_to = 0, i = 0; |
144 | int ret; |
145 | |
146 | if (tb[IPSET_ATTR_LINENO]) |
147 | *lineno = nla_get_u32(nla: tb[IPSET_ATTR_LINENO]); |
148 | |
149 | if (unlikely(!tb[IPSET_ATTR_IP] || |
150 | !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) |
151 | return -IPSET_ERR_PROTOCOL; |
152 | |
153 | ret = ip_set_get_hostipaddr4(nla: tb[IPSET_ATTR_IP], ipaddr: &ip); |
154 | if (ret) |
155 | return ret; |
156 | |
157 | ret = ip_set_get_extensions(set, tb, ext: &ext); |
158 | if (ret) |
159 | return ret; |
160 | |
161 | if (tb[IPSET_ATTR_CIDR]) { |
162 | e.cidr = nla_get_u8(nla: tb[IPSET_ATTR_CIDR]); |
163 | if (!e.cidr || e.cidr > HOST_MASK) |
164 | return -IPSET_ERR_INVALID_CIDR; |
165 | } |
166 | |
167 | if (tb[IPSET_ATTR_CADT_FLAGS]) { |
168 | u32 cadt_flags = ip_set_get_h32(attr: tb[IPSET_ATTR_CADT_FLAGS]); |
169 | |
170 | if (cadt_flags & IPSET_FLAG_NOMATCH) |
171 | flags |= (IPSET_FLAG_NOMATCH << 16); |
172 | } |
173 | |
174 | if (adt == IPSET_TEST || !tb[IPSET_ATTR_IP_TO]) { |
175 | e.ip = htonl(ip & ip_set_hostmask(e.cidr)); |
176 | ret = adtfn(set, &e, &ext, &ext, flags); |
177 | return ip_set_enomatch(ret, flags, adt, set) ? -ret : |
178 | ip_set_eexist(ret, flags) ? 0 : ret; |
179 | } |
180 | |
181 | ip_to = ip; |
182 | if (tb[IPSET_ATTR_IP_TO]) { |
183 | ret = ip_set_get_hostipaddr4(nla: tb[IPSET_ATTR_IP_TO], ipaddr: &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 | |
192 | if (retried) |
193 | ip = ntohl(h->next.ip); |
194 | do { |
195 | i++; |
196 | e.ip = htonl(ip); |
197 | if (i > IPSET_MAX_RANGE) { |
198 | hash_net4_data_next(next: &h->next, d: &e); |
199 | return -ERANGE; |
200 | } |
201 | ip = ip_set_range_to_cidr(from: ip, to: ip_to, cidr: &e.cidr); |
202 | ret = adtfn(set, &e, &ext, &ext, flags); |
203 | if (ret && !ip_set_eexist(ret, flags)) |
204 | return ret; |
205 | |
206 | ret = 0; |
207 | } while (ip++ < ip_to); |
208 | return ret; |
209 | } |
210 | |
211 | /* IPv6 variant */ |
212 | |
213 | struct hash_net6_elem { |
214 | union nf_inet_addr ip; |
215 | u16 padding0; |
216 | u8 nomatch; |
217 | u8 cidr; |
218 | }; |
219 | |
220 | /* Common functions */ |
221 | |
222 | static bool |
223 | hash_net6_data_equal(const struct hash_net6_elem *ip1, |
224 | const struct hash_net6_elem *ip2, |
225 | u32 *multi) |
226 | { |
227 | return ipv6_addr_equal(a1: &ip1->ip.in6, a2: &ip2->ip.in6) && |
228 | ip1->cidr == ip2->cidr; |
229 | } |
230 | |
231 | static int |
232 | hash_net6_do_data_match(const struct hash_net6_elem *elem) |
233 | { |
234 | return elem->nomatch ? -ENOTEMPTY : 1; |
235 | } |
236 | |
237 | static void |
238 | hash_net6_data_set_flags(struct hash_net6_elem *elem, u32 flags) |
239 | { |
240 | elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH; |
241 | } |
242 | |
243 | static void |
244 | hash_net6_data_reset_flags(struct hash_net6_elem *elem, u8 *flags) |
245 | { |
246 | swap(*flags, elem->nomatch); |
247 | } |
248 | |
249 | static void |
250 | hash_net6_data_netmask(struct hash_net6_elem *elem, u8 cidr) |
251 | { |
252 | ip6_netmask(ip: &elem->ip, prefix: cidr); |
253 | elem->cidr = cidr; |
254 | } |
255 | |
256 | static bool |
257 | hash_net6_data_list(struct sk_buff *skb, const struct hash_net6_elem *data) |
258 | { |
259 | u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0; |
260 | |
261 | if (nla_put_ipaddr6(skb, type: IPSET_ATTR_IP, ipaddrptr: &data->ip.in6) || |
262 | nla_put_u8(skb, attrtype: IPSET_ATTR_CIDR, value: data->cidr) || |
263 | (flags && |
264 | nla_put_net32(skb, attrtype: IPSET_ATTR_CADT_FLAGS, htonl(flags)))) |
265 | goto nla_put_failure; |
266 | return false; |
267 | |
268 | nla_put_failure: |
269 | return true; |
270 | } |
271 | |
272 | static void |
273 | hash_net6_data_next(struct hash_net6_elem *next, |
274 | const struct hash_net6_elem *d) |
275 | { |
276 | } |
277 | |
278 | #undef MTYPE |
279 | #undef HOST_MASK |
280 | |
281 | #define MTYPE hash_net6 |
282 | #define HOST_MASK 128 |
283 | #define IP_SET_EMIT_CREATE |
284 | #include "ip_set_hash_gen.h" |
285 | |
286 | static int |
287 | hash_net6_kadt(struct ip_set *set, const struct sk_buff *skb, |
288 | const struct xt_action_param *par, |
289 | enum ipset_adt adt, struct ip_set_adt_opt *opt) |
290 | { |
291 | const struct hash_net6 *h = set->data; |
292 | ipset_adtfn adtfn = set->variant->adt[adt]; |
293 | struct hash_net6_elem e = { |
294 | .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK), |
295 | }; |
296 | struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); |
297 | |
298 | if (e.cidr == 0) |
299 | return -EINVAL; |
300 | if (adt == IPSET_TEST) |
301 | e.cidr = HOST_MASK; |
302 | |
303 | ip6addrptr(skb, src: opt->flags & IPSET_DIM_ONE_SRC, addr: &e.ip.in6); |
304 | ip6_netmask(ip: &e.ip, prefix: e.cidr); |
305 | |
306 | return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); |
307 | } |
308 | |
309 | static int |
310 | hash_net6_uadt(struct ip_set *set, struct nlattr *tb[], |
311 | enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) |
312 | { |
313 | ipset_adtfn adtfn = set->variant->adt[adt]; |
314 | struct hash_net6_elem e = { .cidr = HOST_MASK }; |
315 | struct ip_set_ext ext = IP_SET_INIT_UEXT(set); |
316 | int ret; |
317 | |
318 | if (tb[IPSET_ATTR_LINENO]) |
319 | *lineno = nla_get_u32(nla: tb[IPSET_ATTR_LINENO]); |
320 | |
321 | if (unlikely(!tb[IPSET_ATTR_IP] || |
322 | !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) |
323 | return -IPSET_ERR_PROTOCOL; |
324 | if (unlikely(tb[IPSET_ATTR_IP_TO])) |
325 | return -IPSET_ERR_HASH_RANGE_UNSUPPORTED; |
326 | |
327 | ret = ip_set_get_ipaddr6(nla: tb[IPSET_ATTR_IP], ipaddr: &e.ip); |
328 | if (ret) |
329 | return ret; |
330 | |
331 | ret = ip_set_get_extensions(set, tb, ext: &ext); |
332 | if (ret) |
333 | return ret; |
334 | |
335 | if (tb[IPSET_ATTR_CIDR]) { |
336 | e.cidr = nla_get_u8(nla: tb[IPSET_ATTR_CIDR]); |
337 | if (!e.cidr || e.cidr > HOST_MASK) |
338 | return -IPSET_ERR_INVALID_CIDR; |
339 | } |
340 | |
341 | ip6_netmask(ip: &e.ip, prefix: e.cidr); |
342 | |
343 | if (tb[IPSET_ATTR_CADT_FLAGS]) { |
344 | u32 cadt_flags = ip_set_get_h32(attr: tb[IPSET_ATTR_CADT_FLAGS]); |
345 | |
346 | if (cadt_flags & IPSET_FLAG_NOMATCH) |
347 | flags |= (IPSET_FLAG_NOMATCH << 16); |
348 | } |
349 | |
350 | ret = adtfn(set, &e, &ext, &ext, flags); |
351 | |
352 | return ip_set_enomatch(ret, flags, adt, set) ? -ret : |
353 | ip_set_eexist(ret, flags) ? 0 : ret; |
354 | } |
355 | |
356 | static struct ip_set_type hash_net_type __read_mostly = { |
357 | .name = "hash:net" , |
358 | .protocol = IPSET_PROTOCOL, |
359 | .features = IPSET_TYPE_IP | IPSET_TYPE_NOMATCH, |
360 | .dimension = IPSET_DIM_ONE, |
361 | .family = NFPROTO_UNSPEC, |
362 | .revision_min = IPSET_TYPE_REV_MIN, |
363 | .revision_max = IPSET_TYPE_REV_MAX, |
364 | .create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE, |
365 | .create = hash_net_create, |
366 | .create_policy = { |
367 | [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, |
368 | [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, |
369 | [IPSET_ATTR_INITVAL] = { .type = NLA_U32 }, |
370 | [IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 }, |
371 | [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, |
372 | [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, |
373 | [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, |
374 | }, |
375 | .adt_policy = { |
376 | [IPSET_ATTR_IP] = { .type = NLA_NESTED }, |
377 | [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, |
378 | [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, |
379 | [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, |
380 | [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, |
381 | [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, |
382 | [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, |
383 | [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, |
384 | [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING, |
385 | .len = IPSET_MAX_COMMENT_SIZE }, |
386 | [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, |
387 | [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, |
388 | [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, |
389 | }, |
390 | .me = THIS_MODULE, |
391 | }; |
392 | |
393 | static int __init |
394 | hash_net_init(void) |
395 | { |
396 | return ip_set_type_register(set_type: &hash_net_type); |
397 | } |
398 | |
399 | static void __exit |
400 | hash_net_fini(void) |
401 | { |
402 | rcu_barrier(); |
403 | ip_set_type_unregister(set_type: &hash_net_type); |
404 | } |
405 | |
406 | module_init(hash_net_init); |
407 | module_exit(hash_net_fini); |
408 | |