1 /* Copyright (C) 2003-2011 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
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.
8 /* Kernel module implementing an IP set type: the hash:net type */
10 #include <linux/jhash.h>
11 #include <linux/module.h>
13 #include <linux/skbuff.h>
14 #include <linux/errno.h>
15 #include <linux/random.h>
18 #include <net/netlink.h>
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_timeout.h>
24 #include <linux/netfilter/ipset/ip_set_hash.h>
26 #define REVISION_MIN 0
27 /* 1 Range as input support for IPv4 added */
28 #define REVISION_MAX 2 /* nomatch flag support added */
30 MODULE_LICENSE("GPL");
31 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
32 IP_SET_MODULE_DESC("hash:net", REVISION_MIN, REVISION_MAX);
33 MODULE_ALIAS("ip_set_hash:net");
35 /* Type specific function prefix */
39 hash_net_same_set(const struct ip_set *a, const struct ip_set *b);
41 #define hash_net4_same_set hash_net_same_set
42 #define hash_net6_same_set hash_net_same_set
44 /* The type variant functions: IPv4 */
46 /* Member elements without timeout */
47 struct hash_net4_elem {
54 /* Member elements with timeout support */
55 struct hash_net4_telem {
60 unsigned long timeout;
64 hash_net4_data_equal(const struct hash_net4_elem *ip1,
65 const struct hash_net4_elem *ip2,
68 return ip1->ip == ip2->ip &&
69 ip1->cidr == ip2->cidr;
73 hash_net4_data_isnull(const struct hash_net4_elem *elem)
75 return elem->cidr == 0;
79 hash_net4_data_copy(struct hash_net4_elem *dst,
80 const struct hash_net4_elem *src)
83 dst->cidr = src->cidr;
84 dst->nomatch = src->nomatch;
88 hash_net4_data_flags(struct hash_net4_elem *dst, u32 flags)
90 dst->nomatch = flags & IPSET_FLAG_NOMATCH;
94 hash_net4_data_match(const struct hash_net4_elem *elem)
96 return elem->nomatch ? -ENOTEMPTY : 1;
100 hash_net4_data_netmask(struct hash_net4_elem *elem, u8 cidr)
102 elem->ip &= ip_set_netmask(cidr);
106 /* Zero CIDR values cannot be stored */
108 hash_net4_data_zero_out(struct hash_net4_elem *elem)
114 hash_net4_data_list(struct sk_buff *skb, const struct hash_net4_elem *data)
116 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
118 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
119 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
121 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
122 goto nla_put_failure;
130 hash_net4_data_tlist(struct sk_buff *skb, const struct hash_net4_elem *data)
132 const struct hash_net4_telem *tdata =
133 (const struct hash_net4_telem *)data;
134 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
136 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, tdata->ip) ||
137 nla_put_u8(skb, IPSET_ATTR_CIDR, tdata->cidr) ||
138 nla_put_net32(skb, IPSET_ATTR_TIMEOUT,
139 htonl(ip_set_timeout_get(tdata->timeout))) ||
141 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
142 goto nla_put_failure;
149 #define IP_SET_HASH_WITH_NETS
153 #include <linux/netfilter/ipset/ip_set_ahash.h>
156 hash_net4_data_next(struct ip_set_hash *h,
157 const struct hash_net4_elem *d)
163 hash_net4_kadt(struct ip_set *set, const struct sk_buff *skb,
164 const struct xt_action_param *par,
165 enum ipset_adt adt, const struct ip_set_adt_opt *opt)
167 const struct ip_set_hash *h = set->data;
168 ipset_adtfn adtfn = set->variant->adt[adt];
169 struct hash_net4_elem data = {
170 .cidr = h->nets[0].cidr ? h->nets[0].cidr : HOST_MASK
175 if (adt == IPSET_TEST)
176 data.cidr = HOST_MASK;
178 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &data.ip);
179 data.ip &= ip_set_netmask(data.cidr);
181 return adtfn(set, &data, opt_timeout(opt, h), opt->cmdflags);
185 hash_net4_uadt(struct ip_set *set, struct nlattr *tb[],
186 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
188 const struct ip_set_hash *h = set->data;
189 ipset_adtfn adtfn = set->variant->adt[adt];
190 struct hash_net4_elem data = { .cidr = HOST_MASK };
191 u32 timeout = h->timeout;
192 u32 ip = 0, ip_to, last;
195 if (unlikely(!tb[IPSET_ATTR_IP] ||
196 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
197 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
198 return -IPSET_ERR_PROTOCOL;
200 if (tb[IPSET_ATTR_LINENO])
201 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
203 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
207 if (tb[IPSET_ATTR_CIDR]) {
208 data.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
209 if (!data.cidr || data.cidr > HOST_MASK)
210 return -IPSET_ERR_INVALID_CIDR;
213 if (tb[IPSET_ATTR_TIMEOUT]) {
214 if (!with_timeout(h->timeout))
215 return -IPSET_ERR_TIMEOUT;
216 timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
219 if (tb[IPSET_ATTR_CADT_FLAGS] && adt == IPSET_ADD) {
220 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
221 if (cadt_flags & IPSET_FLAG_NOMATCH)
222 flags |= (cadt_flags << 16);
225 if (adt == IPSET_TEST || !tb[IPSET_ATTR_IP_TO]) {
226 data.ip = htonl(ip & ip_set_hostmask(data.cidr));
227 ret = adtfn(set, &data, timeout, flags);
228 return ip_set_eexist(ret, flags) ? 0 : ret;
232 if (tb[IPSET_ATTR_IP_TO]) {
233 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
238 if (ip + UINT_MAX == ip_to)
239 return -IPSET_ERR_HASH_RANGE;
242 ip = ntohl(h->next.ip);
243 while (!after(ip, ip_to)) {
245 last = ip_set_range_to_cidr(ip, ip_to, &data.cidr);
246 ret = adtfn(set, &data, timeout, flags);
247 if (ret && !ip_set_eexist(ret, flags))
257 hash_net_same_set(const struct ip_set *a, const struct ip_set *b)
259 const struct ip_set_hash *x = a->data;
260 const struct ip_set_hash *y = b->data;
262 /* Resizing changes htable_bits, so we ignore it */
263 return x->maxelem == y->maxelem &&
264 x->timeout == y->timeout;
267 /* The type variant functions: IPv6 */
269 struct hash_net6_elem {
270 union nf_inet_addr ip;
276 struct hash_net6_telem {
277 union nf_inet_addr ip;
281 unsigned long timeout;
285 hash_net6_data_equal(const struct hash_net6_elem *ip1,
286 const struct hash_net6_elem *ip2,
289 return ipv6_addr_cmp(&ip1->ip.in6, &ip2->ip.in6) == 0 &&
290 ip1->cidr == ip2->cidr;
294 hash_net6_data_isnull(const struct hash_net6_elem *elem)
296 return elem->cidr == 0;
300 hash_net6_data_copy(struct hash_net6_elem *dst,
301 const struct hash_net6_elem *src)
303 dst->ip.in6 = src->ip.in6;
304 dst->cidr = src->cidr;
305 dst->nomatch = src->nomatch;
309 hash_net6_data_flags(struct hash_net6_elem *dst, u32 flags)
311 dst->nomatch = flags & IPSET_FLAG_NOMATCH;
315 hash_net6_data_match(const struct hash_net6_elem *elem)
317 return elem->nomatch ? -ENOTEMPTY : 1;
321 hash_net6_data_zero_out(struct hash_net6_elem *elem)
327 ip6_netmask(union nf_inet_addr *ip, u8 prefix)
329 ip->ip6[0] &= ip_set_netmask6(prefix)[0];
330 ip->ip6[1] &= ip_set_netmask6(prefix)[1];
331 ip->ip6[2] &= ip_set_netmask6(prefix)[2];
332 ip->ip6[3] &= ip_set_netmask6(prefix)[3];
336 hash_net6_data_netmask(struct hash_net6_elem *elem, u8 cidr)
338 ip6_netmask(&elem->ip, cidr);
343 hash_net6_data_list(struct sk_buff *skb, const struct hash_net6_elem *data)
345 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
347 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
348 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
350 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
351 goto nla_put_failure;
359 hash_net6_data_tlist(struct sk_buff *skb, const struct hash_net6_elem *data)
361 const struct hash_net6_telem *e =
362 (const struct hash_net6_telem *)data;
363 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
365 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6) ||
366 nla_put_u8(skb, IPSET_ATTR_CIDR, e->cidr) ||
367 nla_put_net32(skb, IPSET_ATTR_TIMEOUT,
368 htonl(ip_set_timeout_get(e->timeout))) ||
370 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
371 goto nla_put_failure;
382 #define HOST_MASK 128
383 #include <linux/netfilter/ipset/ip_set_ahash.h>
386 hash_net6_data_next(struct ip_set_hash *h,
387 const struct hash_net6_elem *d)
392 hash_net6_kadt(struct ip_set *set, const struct sk_buff *skb,
393 const struct xt_action_param *par,
394 enum ipset_adt adt, const struct ip_set_adt_opt *opt)
396 const struct ip_set_hash *h = set->data;
397 ipset_adtfn adtfn = set->variant->adt[adt];
398 struct hash_net6_elem data = {
399 .cidr = h->nets[0].cidr ? h->nets[0].cidr : HOST_MASK
404 if (adt == IPSET_TEST)
405 data.cidr = HOST_MASK;
407 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &data.ip.in6);
408 ip6_netmask(&data.ip, data.cidr);
410 return adtfn(set, &data, opt_timeout(opt, h), opt->cmdflags);
414 hash_net6_uadt(struct ip_set *set, struct nlattr *tb[],
415 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
417 const struct ip_set_hash *h = set->data;
418 ipset_adtfn adtfn = set->variant->adt[adt];
419 struct hash_net6_elem data = { .cidr = HOST_MASK };
420 u32 timeout = h->timeout;
423 if (unlikely(!tb[IPSET_ATTR_IP] ||
424 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
425 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
426 return -IPSET_ERR_PROTOCOL;
427 if (unlikely(tb[IPSET_ATTR_IP_TO]))
428 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
430 if (tb[IPSET_ATTR_LINENO])
431 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
433 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &data.ip);
437 if (tb[IPSET_ATTR_CIDR])
438 data.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
440 if (!data.cidr || data.cidr > HOST_MASK)
441 return -IPSET_ERR_INVALID_CIDR;
443 ip6_netmask(&data.ip, data.cidr);
445 if (tb[IPSET_ATTR_TIMEOUT]) {
446 if (!with_timeout(h->timeout))
447 return -IPSET_ERR_TIMEOUT;
448 timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
451 if (tb[IPSET_ATTR_CADT_FLAGS] && adt == IPSET_ADD) {
452 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
453 if (cadt_flags & IPSET_FLAG_NOMATCH)
454 flags |= (cadt_flags << 16);
457 ret = adtfn(set, &data, timeout, flags);
459 return ip_set_eexist(ret, flags) ? 0 : ret;
462 /* Create hash:ip type of sets */
465 hash_net_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
467 u32 hashsize = IPSET_DEFAULT_HASHSIZE, maxelem = IPSET_DEFAULT_MAXELEM;
468 struct ip_set_hash *h;
472 if (!(set->family == NFPROTO_IPV4 || set->family == NFPROTO_IPV6))
473 return -IPSET_ERR_INVALID_FAMILY;
475 if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_HASHSIZE) ||
476 !ip_set_optattr_netorder(tb, IPSET_ATTR_MAXELEM) ||
477 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))
478 return -IPSET_ERR_PROTOCOL;
480 if (tb[IPSET_ATTR_HASHSIZE]) {
481 hashsize = ip_set_get_h32(tb[IPSET_ATTR_HASHSIZE]);
482 if (hashsize < IPSET_MIMINAL_HASHSIZE)
483 hashsize = IPSET_MIMINAL_HASHSIZE;
486 if (tb[IPSET_ATTR_MAXELEM])
487 maxelem = ip_set_get_h32(tb[IPSET_ATTR_MAXELEM]);
489 h = kzalloc(sizeof(*h)
490 + sizeof(struct ip_set_hash_nets)
491 * (set->family == NFPROTO_IPV4 ? 32 : 128), GFP_KERNEL);
495 h->maxelem = maxelem;
496 get_random_bytes(&h->initval, sizeof(h->initval));
497 h->timeout = IPSET_NO_TIMEOUT;
499 hbits = htable_bits(hashsize);
500 hsize = htable_size(hbits);
505 h->table = ip_set_alloc(hsize);
510 h->table->htable_bits = hbits;
514 if (tb[IPSET_ATTR_TIMEOUT]) {
515 h->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
517 set->variant = set->family == NFPROTO_IPV4
518 ? &hash_net4_tvariant : &hash_net6_tvariant;
520 if (set->family == NFPROTO_IPV4)
521 hash_net4_gc_init(set);
523 hash_net6_gc_init(set);
525 set->variant = set->family == NFPROTO_IPV4
526 ? &hash_net4_variant : &hash_net6_variant;
529 pr_debug("create %s hashsize %u (%u) maxelem %u: %p(%p)\n",
530 set->name, jhash_size(h->table->htable_bits),
531 h->table->htable_bits, h->maxelem, set->data, h->table);
536 static struct ip_set_type hash_net_type __read_mostly = {
538 .protocol = IPSET_PROTOCOL,
539 .features = IPSET_TYPE_IP | IPSET_TYPE_NOMATCH,
540 .dimension = IPSET_DIM_ONE,
541 .family = NFPROTO_UNSPEC,
542 .revision_min = REVISION_MIN,
543 .revision_max = REVISION_MAX,
544 .create = hash_net_create,
546 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
547 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
548 [IPSET_ATTR_PROBES] = { .type = NLA_U8 },
549 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
550 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
553 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
554 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
555 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
556 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
557 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
565 return ip_set_type_register(&hash_net_type);
571 ip_set_type_unregister(&hash_net_type);
574 module_init(hash_net_init);
575 module_exit(hash_net_fini);