1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@netfilter.org>
3 * Copyright (C) 2013 Oliver Smith <oliver@8.c.9.b.0.7.4.0.1.0.0.2.ip6.arpa>
4 */
5
6/* Kernel module implementing an IP set type: the hash:net type */
7
8#include <linux/jhash.h>
9#include <linux/module.h>
10#include <linux/ip.h>
11#include <linux/skbuff.h>
12#include <linux/errno.h>
13#include <linux/random.h>
14#include <net/ip.h>
15#include <net/ipv6.h>
16#include <net/netlink.h>
17
18#include <linux/netfilter.h>
19#include <linux/netfilter/ipset/pfxlen.h>
20#include <linux/netfilter/ipset/ip_set.h>
21#include <linux/netfilter/ipset/ip_set_hash.h>
22
23#define IPSET_TYPE_REV_MIN 0
24/* 1 Forceadd support added */
25/* 2 skbinfo support added */
26/* 3 bucketsize, initval support added */
27#define IPSET_TYPE_REV_MAX 4 /* bitmask support added */
28
29MODULE_LICENSE("GPL");
30MODULE_AUTHOR("Oliver Smith <oliver@8.c.9.b.0.7.4.0.1.0.0.2.ip6.arpa>");
31IP_SET_MODULE_DESC("hash:net,net", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
32MODULE_ALIAS("ip_set_hash:net,net");
33
34/* Type specific function prefix */
35#define HTYPE hash_netnet
36#define IP_SET_HASH_WITH_NETS
37#define IP_SET_HASH_WITH_NETMASK
38#define IP_SET_HASH_WITH_BITMASK
39#define IPSET_NET_COUNT 2
40
41/* IPv4 variants */
42
43/* Member elements */
44struct hash_netnet4_elem {
45 union {
46 __be32 ip[2];
47 __be64 ipcmp;
48 };
49 u8 nomatch;
50 u8 padding;
51 union {
52 u8 cidr[2];
53 u16 ccmp;
54 };
55};
56
57/* Common functions */
58
59static bool
60hash_netnet4_data_equal(const struct hash_netnet4_elem *ip1,
61 const struct hash_netnet4_elem *ip2,
62 u32 *multi)
63{
64 return ip1->ipcmp == ip2->ipcmp &&
65 ip1->ccmp == ip2->ccmp;
66}
67
68static int
69hash_netnet4_do_data_match(const struct hash_netnet4_elem *elem)
70{
71 return elem->nomatch ? -ENOTEMPTY : 1;
72}
73
74static void
75hash_netnet4_data_set_flags(struct hash_netnet4_elem *elem, u32 flags)
76{
77 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
78}
79
80static void
81hash_netnet4_data_reset_flags(struct hash_netnet4_elem *elem, u8 *flags)
82{
83 swap(*flags, elem->nomatch);
84}
85
86static void
87hash_netnet4_data_reset_elem(struct hash_netnet4_elem *elem,
88 struct hash_netnet4_elem *orig)
89{
90 elem->ip[1] = orig->ip[1];
91}
92
93static void
94hash_netnet4_data_netmask(struct hash_netnet4_elem *elem, u8 cidr, bool inner)
95{
96 if (inner) {
97 elem->ip[1] &= ip_set_netmask(pfxlen: cidr);
98 elem->cidr[1] = cidr;
99 } else {
100 elem->ip[0] &= ip_set_netmask(pfxlen: cidr);
101 elem->cidr[0] = cidr;
102 }
103}
104
105static bool
106hash_netnet4_data_list(struct sk_buff *skb,
107 const struct hash_netnet4_elem *data)
108{
109 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
110
111 if (nla_put_ipaddr4(skb, type: IPSET_ATTR_IP, ipaddr: data->ip[0]) ||
112 nla_put_ipaddr4(skb, type: IPSET_ATTR_IP2, ipaddr: data->ip[1]) ||
113 nla_put_u8(skb, attrtype: IPSET_ATTR_CIDR, value: data->cidr[0]) ||
114 nla_put_u8(skb, attrtype: IPSET_ATTR_CIDR2, value: data->cidr[1]) ||
115 (flags &&
116 nla_put_net32(skb, attrtype: IPSET_ATTR_CADT_FLAGS, htonl(flags))))
117 goto nla_put_failure;
118 return false;
119
120nla_put_failure:
121 return true;
122}
123
124static void
125hash_netnet4_data_next(struct hash_netnet4_elem *next,
126 const struct hash_netnet4_elem *d)
127{
128 next->ipcmp = d->ipcmp;
129}
130
131#define MTYPE hash_netnet4
132#define HOST_MASK 32
133#include "ip_set_hash_gen.h"
134
135static void
136hash_netnet4_init(struct hash_netnet4_elem *e)
137{
138 e->cidr[0] = HOST_MASK;
139 e->cidr[1] = HOST_MASK;
140}
141
142static int
143hash_netnet4_kadt(struct ip_set *set, const struct sk_buff *skb,
144 const struct xt_action_param *par,
145 enum ipset_adt adt, struct ip_set_adt_opt *opt)
146{
147 const struct hash_netnet4 *h = set->data;
148 ipset_adtfn adtfn = set->variant->adt[adt];
149 struct hash_netnet4_elem e = { };
150 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
151
152 e.cidr[0] = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK);
153 e.cidr[1] = INIT_CIDR(h->nets[0].cidr[1], HOST_MASK);
154 if (adt == IPSET_TEST)
155 e.ccmp = (HOST_MASK << (sizeof(e.cidr[0]) * 8)) | HOST_MASK;
156
157 ip4addrptr(skb, src: opt->flags & IPSET_DIM_ONE_SRC, addr: &e.ip[0]);
158 ip4addrptr(skb, src: opt->flags & IPSET_DIM_TWO_SRC, addr: &e.ip[1]);
159 e.ip[0] &= (ip_set_netmask(pfxlen: e.cidr[0]) & h->bitmask.ip);
160 e.ip[1] &= (ip_set_netmask(pfxlen: e.cidr[1]) & h->bitmask.ip);
161
162 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
163}
164
165static int
166hash_netnet4_uadt(struct ip_set *set, struct nlattr *tb[],
167 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
168{
169 struct hash_netnet4 *h = set->data;
170 ipset_adtfn adtfn = set->variant->adt[adt];
171 struct hash_netnet4_elem e = { };
172 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
173 u32 ip = 0, ip_to = 0;
174 u32 ip2 = 0, ip2_from = 0, ip2_to = 0, i = 0;
175 int ret;
176
177 if (tb[IPSET_ATTR_LINENO])
178 *lineno = nla_get_u32(nla: tb[IPSET_ATTR_LINENO]);
179
180 hash_netnet4_init(e: &e);
181 if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
182 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
183 return -IPSET_ERR_PROTOCOL;
184
185 ret = ip_set_get_hostipaddr4(nla: tb[IPSET_ATTR_IP], ipaddr: &ip);
186 if (ret)
187 return ret;
188
189 ret = ip_set_get_hostipaddr4(nla: tb[IPSET_ATTR_IP2], ipaddr: &ip2_from);
190 if (ret)
191 return ret;
192
193 ret = ip_set_get_extensions(set, tb, ext: &ext);
194 if (ret)
195 return ret;
196
197 if (tb[IPSET_ATTR_CIDR]) {
198 e.cidr[0] = nla_get_u8(nla: tb[IPSET_ATTR_CIDR]);
199 if (!e.cidr[0] || e.cidr[0] > HOST_MASK)
200 return -IPSET_ERR_INVALID_CIDR;
201 }
202
203 if (tb[IPSET_ATTR_CIDR2]) {
204 e.cidr[1] = nla_get_u8(nla: tb[IPSET_ATTR_CIDR2]);
205 if (!e.cidr[1] || e.cidr[1] > HOST_MASK)
206 return -IPSET_ERR_INVALID_CIDR;
207 }
208
209 if (tb[IPSET_ATTR_CADT_FLAGS]) {
210 u32 cadt_flags = ip_set_get_h32(attr: tb[IPSET_ATTR_CADT_FLAGS]);
211
212 if (cadt_flags & IPSET_FLAG_NOMATCH)
213 flags |= (IPSET_FLAG_NOMATCH << 16);
214 }
215
216 if (adt == IPSET_TEST || !(tb[IPSET_ATTR_IP_TO] ||
217 tb[IPSET_ATTR_IP2_TO])) {
218 e.ip[0] = htonl(ip & ntohl(h->bitmask.ip) & ip_set_hostmask(e.cidr[0]));
219 e.ip[1] = htonl(ip2_from & ntohl(h->bitmask.ip) & ip_set_hostmask(e.cidr[1]));
220 ret = adtfn(set, &e, &ext, &ext, flags);
221 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
222 ip_set_eexist(ret, flags) ? 0 : ret;
223 }
224
225 ip_to = ip;
226 if (tb[IPSET_ATTR_IP_TO]) {
227 ret = ip_set_get_hostipaddr4(nla: tb[IPSET_ATTR_IP_TO], ipaddr: &ip_to);
228 if (ret)
229 return ret;
230 if (ip_to < ip)
231 swap(ip, ip_to);
232 if (unlikely(ip + UINT_MAX == ip_to))
233 return -IPSET_ERR_HASH_RANGE;
234 } else {
235 ip_set_mask_from_to(ip, ip_to, e.cidr[0]);
236 }
237
238 ip2_to = ip2_from;
239 if (tb[IPSET_ATTR_IP2_TO]) {
240 ret = ip_set_get_hostipaddr4(nla: tb[IPSET_ATTR_IP2_TO], ipaddr: &ip2_to);
241 if (ret)
242 return ret;
243 if (ip2_to < ip2_from)
244 swap(ip2_from, ip2_to);
245 if (unlikely(ip2_from + UINT_MAX == ip2_to))
246 return -IPSET_ERR_HASH_RANGE;
247 } else {
248 ip_set_mask_from_to(ip2_from, ip2_to, e.cidr[1]);
249 }
250
251 if (retried) {
252 ip = ntohl(h->next.ip[0]);
253 ip2 = ntohl(h->next.ip[1]);
254 } else {
255 ip2 = ip2_from;
256 }
257
258 do {
259 e.ip[0] = htonl(ip);
260 ip = ip_set_range_to_cidr(from: ip, to: ip_to, cidr: &e.cidr[0]);
261 do {
262 i++;
263 e.ip[1] = htonl(ip2);
264 if (i > IPSET_MAX_RANGE) {
265 hash_netnet4_data_next(next: &h->next, d: &e);
266 return -ERANGE;
267 }
268 ip2 = ip_set_range_to_cidr(from: ip2, to: ip2_to, cidr: &e.cidr[1]);
269 ret = adtfn(set, &e, &ext, &ext, flags);
270 if (ret && !ip_set_eexist(ret, flags))
271 return ret;
272
273 ret = 0;
274 } while (ip2++ < ip2_to);
275 ip2 = ip2_from;
276 } while (ip++ < ip_to);
277 return ret;
278}
279
280/* IPv6 variants */
281
282struct hash_netnet6_elem {
283 union nf_inet_addr ip[2];
284 u8 nomatch;
285 u8 padding;
286 union {
287 u8 cidr[2];
288 u16 ccmp;
289 };
290};
291
292/* Common functions */
293
294static bool
295hash_netnet6_data_equal(const struct hash_netnet6_elem *ip1,
296 const struct hash_netnet6_elem *ip2,
297 u32 *multi)
298{
299 return ipv6_addr_equal(a1: &ip1->ip[0].in6, a2: &ip2->ip[0].in6) &&
300 ipv6_addr_equal(a1: &ip1->ip[1].in6, a2: &ip2->ip[1].in6) &&
301 ip1->ccmp == ip2->ccmp;
302}
303
304static int
305hash_netnet6_do_data_match(const struct hash_netnet6_elem *elem)
306{
307 return elem->nomatch ? -ENOTEMPTY : 1;
308}
309
310static void
311hash_netnet6_data_set_flags(struct hash_netnet6_elem *elem, u32 flags)
312{
313 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
314}
315
316static void
317hash_netnet6_data_reset_flags(struct hash_netnet6_elem *elem, u8 *flags)
318{
319 swap(*flags, elem->nomatch);
320}
321
322static void
323hash_netnet6_data_reset_elem(struct hash_netnet6_elem *elem,
324 struct hash_netnet6_elem *orig)
325{
326 elem->ip[1] = orig->ip[1];
327}
328
329static void
330hash_netnet6_data_netmask(struct hash_netnet6_elem *elem, u8 cidr, bool inner)
331{
332 if (inner) {
333 ip6_netmask(ip: &elem->ip[1], prefix: cidr);
334 elem->cidr[1] = cidr;
335 } else {
336 ip6_netmask(ip: &elem->ip[0], prefix: cidr);
337 elem->cidr[0] = cidr;
338 }
339}
340
341static bool
342hash_netnet6_data_list(struct sk_buff *skb,
343 const struct hash_netnet6_elem *data)
344{
345 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
346
347 if (nla_put_ipaddr6(skb, type: IPSET_ATTR_IP, ipaddrptr: &data->ip[0].in6) ||
348 nla_put_ipaddr6(skb, type: IPSET_ATTR_IP2, ipaddrptr: &data->ip[1].in6) ||
349 nla_put_u8(skb, attrtype: IPSET_ATTR_CIDR, value: data->cidr[0]) ||
350 nla_put_u8(skb, attrtype: IPSET_ATTR_CIDR2, value: data->cidr[1]) ||
351 (flags &&
352 nla_put_net32(skb, attrtype: IPSET_ATTR_CADT_FLAGS, htonl(flags))))
353 goto nla_put_failure;
354 return false;
355
356nla_put_failure:
357 return true;
358}
359
360static void
361hash_netnet6_data_next(struct hash_netnet6_elem *next,
362 const struct hash_netnet6_elem *d)
363{
364}
365
366#undef MTYPE
367#undef HOST_MASK
368
369#define MTYPE hash_netnet6
370#define HOST_MASK 128
371#define IP_SET_EMIT_CREATE
372#include "ip_set_hash_gen.h"
373
374static void
375hash_netnet6_init(struct hash_netnet6_elem *e)
376{
377 e->cidr[0] = HOST_MASK;
378 e->cidr[1] = HOST_MASK;
379}
380
381static int
382hash_netnet6_kadt(struct ip_set *set, const struct sk_buff *skb,
383 const struct xt_action_param *par,
384 enum ipset_adt adt, struct ip_set_adt_opt *opt)
385{
386 const struct hash_netnet6 *h = set->data;
387 ipset_adtfn adtfn = set->variant->adt[adt];
388 struct hash_netnet6_elem e = { };
389 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
390
391 e.cidr[0] = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK);
392 e.cidr[1] = INIT_CIDR(h->nets[0].cidr[1], HOST_MASK);
393 if (adt == IPSET_TEST)
394 e.ccmp = (HOST_MASK << (sizeof(u8) * 8)) | HOST_MASK;
395
396 ip6addrptr(skb, src: opt->flags & IPSET_DIM_ONE_SRC, addr: &e.ip[0].in6);
397 ip6addrptr(skb, src: opt->flags & IPSET_DIM_TWO_SRC, addr: &e.ip[1].in6);
398 ip6_netmask(ip: &e.ip[0], prefix: e.cidr[0]);
399 ip6_netmask(ip: &e.ip[1], prefix: e.cidr[1]);
400
401 nf_inet_addr_mask_inplace(a1: &e.ip[0], mask: &h->bitmask);
402 nf_inet_addr_mask_inplace(a1: &e.ip[1], mask: &h->bitmask);
403 if (e.cidr[0] == HOST_MASK && ipv6_addr_any(a: &e.ip[0].in6))
404 return -EINVAL;
405
406 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
407}
408
409static int
410hash_netnet6_uadt(struct ip_set *set, struct nlattr *tb[],
411 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
412{
413 ipset_adtfn adtfn = set->variant->adt[adt];
414 struct hash_netnet6_elem e = { };
415 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
416 const struct hash_netnet6 *h = set->data;
417 int ret;
418
419 if (tb[IPSET_ATTR_LINENO])
420 *lineno = nla_get_u32(nla: tb[IPSET_ATTR_LINENO]);
421
422 hash_netnet6_init(e: &e);
423 if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
424 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
425 return -IPSET_ERR_PROTOCOL;
426 if (unlikely(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_IP2_TO]))
427 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
428
429 ret = ip_set_get_ipaddr6(nla: tb[IPSET_ATTR_IP], ipaddr: &e.ip[0]);
430 if (ret)
431 return ret;
432
433 ret = ip_set_get_ipaddr6(nla: tb[IPSET_ATTR_IP2], ipaddr: &e.ip[1]);
434 if (ret)
435 return ret;
436
437 ret = ip_set_get_extensions(set, tb, ext: &ext);
438 if (ret)
439 return ret;
440
441 if (tb[IPSET_ATTR_CIDR]) {
442 e.cidr[0] = nla_get_u8(nla: tb[IPSET_ATTR_CIDR]);
443 if (!e.cidr[0] || e.cidr[0] > HOST_MASK)
444 return -IPSET_ERR_INVALID_CIDR;
445 }
446
447 if (tb[IPSET_ATTR_CIDR2]) {
448 e.cidr[1] = nla_get_u8(nla: tb[IPSET_ATTR_CIDR2]);
449 if (!e.cidr[1] || e.cidr[1] > HOST_MASK)
450 return -IPSET_ERR_INVALID_CIDR;
451 }
452
453 ip6_netmask(ip: &e.ip[0], prefix: e.cidr[0]);
454 ip6_netmask(ip: &e.ip[1], prefix: e.cidr[1]);
455
456 nf_inet_addr_mask_inplace(a1: &e.ip[0], mask: &h->bitmask);
457 nf_inet_addr_mask_inplace(a1: &e.ip[1], mask: &h->bitmask);
458 if (e.cidr[0] == HOST_MASK && ipv6_addr_any(a: &e.ip[0].in6))
459 return -IPSET_ERR_HASH_ELEM;
460
461 if (tb[IPSET_ATTR_CADT_FLAGS]) {
462 u32 cadt_flags = ip_set_get_h32(attr: tb[IPSET_ATTR_CADT_FLAGS]);
463
464 if (cadt_flags & IPSET_FLAG_NOMATCH)
465 flags |= (IPSET_FLAG_NOMATCH << 16);
466 }
467
468 ret = adtfn(set, &e, &ext, &ext, flags);
469
470 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
471 ip_set_eexist(ret, flags) ? 0 : ret;
472}
473
474static struct ip_set_type hash_netnet_type __read_mostly = {
475 .name = "hash:net,net",
476 .protocol = IPSET_PROTOCOL,
477 .features = IPSET_TYPE_IP | IPSET_TYPE_IP2 | IPSET_TYPE_NOMATCH,
478 .dimension = IPSET_DIM_TWO,
479 .family = NFPROTO_UNSPEC,
480 .revision_min = IPSET_TYPE_REV_MIN,
481 .revision_max = IPSET_TYPE_REV_MAX,
482 .create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE,
483 .create = hash_netnet_create,
484 .create_policy = {
485 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
486 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
487 [IPSET_ATTR_INITVAL] = { .type = NLA_U32 },
488 [IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 },
489 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
490 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
491 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
492 [IPSET_ATTR_NETMASK] = { .type = NLA_U8 },
493 [IPSET_ATTR_BITMASK] = { .type = NLA_NESTED },
494 },
495 .adt_policy = {
496 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
497 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
498 [IPSET_ATTR_IP2] = { .type = NLA_NESTED },
499 [IPSET_ATTR_IP2_TO] = { .type = NLA_NESTED },
500 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
501 [IPSET_ATTR_CIDR2] = { .type = NLA_U8 },
502 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
503 [IPSET_ATTR_LINENO] = { .type = NLA_U32 },
504 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
505 [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
506 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
507 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING,
508 .len = IPSET_MAX_COMMENT_SIZE },
509 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 },
510 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 },
511 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 },
512 },
513 .me = THIS_MODULE,
514};
515
516static int __init
517hash_netnet_init(void)
518{
519 return ip_set_type_register(set_type: &hash_netnet_type);
520}
521
522static void __exit
523hash_netnet_fini(void)
524{
525 rcu_barrier();
526 ip_set_type_unregister(set_type: &hash_netnet_type);
527}
528
529module_init(hash_netnet_init);
530module_exit(hash_netnet_fini);
531

source code of linux/net/netfilter/ipset/ip_set_hash_netnet.c