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:ip 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>
21 #include <linux/netfilter.h>
22 #include <linux/netfilter/ipset/pfxlen.h>
23 #include <linux/netfilter/ipset/ip_set.h>
24 #include <linux/netfilter/ipset/ip_set_timeout.h>
25 #include <linux/netfilter/ipset/ip_set_hash.h>
27 #define REVISION_MIN 0
28 #define REVISION_MAX 0
30 MODULE_LICENSE("GPL");
31 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
32 IP_SET_MODULE_DESC("hash:ip", REVISION_MIN
, REVISION_MAX
);
33 MODULE_ALIAS("ip_set_hash:ip");
35 /* Type specific function prefix */
39 hash_ip_same_set(const struct ip_set
*a
, const struct ip_set
*b
);
41 #define hash_ip4_same_set hash_ip_same_set
42 #define hash_ip6_same_set hash_ip_same_set
44 /* The type variant functions: IPv4 */
46 /* Member elements without timeout */
47 struct hash_ip4_elem
{
51 /* Member elements with timeout support */
52 struct hash_ip4_telem
{
54 unsigned long timeout
;
58 hash_ip4_data_equal(const struct hash_ip4_elem
*ip1
,
59 const struct hash_ip4_elem
*ip2
,
62 return ip1
->ip
== ip2
->ip
;
66 hash_ip4_data_isnull(const struct hash_ip4_elem
*elem
)
72 hash_ip4_data_copy(struct hash_ip4_elem
*dst
, const struct hash_ip4_elem
*src
)
77 /* Zero valued IP addresses cannot be stored */
79 hash_ip4_data_zero_out(struct hash_ip4_elem
*elem
)
85 hash_ip4_data_list(struct sk_buff
*skb
, const struct hash_ip4_elem
*data
)
87 if (nla_put_ipaddr4(skb
, IPSET_ATTR_IP
, data
->ip
))
96 hash_ip4_data_tlist(struct sk_buff
*skb
, const struct hash_ip4_elem
*data
)
98 const struct hash_ip4_telem
*tdata
=
99 (const struct hash_ip4_telem
*)data
;
101 if (nla_put_ipaddr4(skb
, IPSET_ATTR_IP
, tdata
->ip
) ||
102 nla_put_net32(skb
, IPSET_ATTR_TIMEOUT
,
103 htonl(ip_set_timeout_get(tdata
->timeout
))))
104 goto nla_put_failure
;
112 #define IP_SET_HASH_WITH_NETMASK
115 #include <linux/netfilter/ipset/ip_set_ahash.h>
118 hash_ip4_data_next(struct ip_set_hash
*h
, const struct hash_ip4_elem
*d
)
124 hash_ip4_kadt(struct ip_set
*set
, const struct sk_buff
*skb
,
125 const struct xt_action_param
*par
,
126 enum ipset_adt adt
, const struct ip_set_adt_opt
*opt
)
128 const struct ip_set_hash
*h
= set
->data
;
129 ipset_adtfn adtfn
= set
->variant
->adt
[adt
];
132 ip4addrptr(skb
, opt
->flags
& IPSET_DIM_ONE_SRC
, &ip
);
133 ip
&= ip_set_netmask(h
->netmask
);
137 return adtfn(set
, &ip
, opt_timeout(opt
, h
), opt
->cmdflags
);
141 hash_ip4_uadt(struct ip_set
*set
, struct nlattr
*tb
[],
142 enum ipset_adt adt
, u32
*lineno
, u32 flags
, bool retried
)
144 const struct ip_set_hash
*h
= set
->data
;
145 ipset_adtfn adtfn
= set
->variant
->adt
[adt
];
146 u32 ip
, ip_to
, hosts
, timeout
= h
->timeout
;
150 if (unlikely(!tb
[IPSET_ATTR_IP
] ||
151 !ip_set_optattr_netorder(tb
, IPSET_ATTR_TIMEOUT
)))
152 return -IPSET_ERR_PROTOCOL
;
154 if (tb
[IPSET_ATTR_LINENO
])
155 *lineno
= nla_get_u32(tb
[IPSET_ATTR_LINENO
]);
157 ret
= ip_set_get_hostipaddr4(tb
[IPSET_ATTR_IP
], &ip
);
161 ip
&= ip_set_hostmask(h
->netmask
);
163 if (tb
[IPSET_ATTR_TIMEOUT
]) {
164 if (!with_timeout(h
->timeout
))
165 return -IPSET_ERR_TIMEOUT
;
166 timeout
= ip_set_timeout_uget(tb
[IPSET_ATTR_TIMEOUT
]);
169 if (adt
== IPSET_TEST
) {
172 return -IPSET_ERR_HASH_ELEM
;
173 return adtfn(set
, &nip
, timeout
, flags
);
176 if (tb
[IPSET_ATTR_IP_TO
]) {
177 ret
= ip_set_get_hostipaddr4(tb
[IPSET_ATTR_IP_TO
], &ip_to
);
182 } else if (tb
[IPSET_ATTR_CIDR
]) {
183 u8 cidr
= nla_get_u8(tb
[IPSET_ATTR_CIDR
]);
185 if (!cidr
|| cidr
> 32)
186 return -IPSET_ERR_INVALID_CIDR
;
187 ip_set_mask_from_to(ip
, ip_to
, cidr
);
191 hosts
= h
->netmask
== 32 ? 1 : 2 << (32 - h
->netmask
- 1);
194 ip
= ntohl(h
->next
.ip
);
195 for (; !before(ip_to
, ip
); ip
+= hosts
) {
198 return -IPSET_ERR_HASH_ELEM
;
199 ret
= adtfn(set
, &nip
, timeout
, flags
);
201 if (ret
&& !ip_set_eexist(ret
, flags
))
210 hash_ip_same_set(const struct ip_set
*a
, const struct ip_set
*b
)
212 const struct ip_set_hash
*x
= a
->data
;
213 const struct ip_set_hash
*y
= b
->data
;
215 /* Resizing changes htable_bits, so we ignore it */
216 return x
->maxelem
== y
->maxelem
&&
217 x
->timeout
== y
->timeout
&&
218 x
->netmask
== y
->netmask
;
221 /* The type variant functions: IPv6 */
223 struct hash_ip6_elem
{
224 union nf_inet_addr ip
;
227 struct hash_ip6_telem
{
228 union nf_inet_addr ip
;
229 unsigned long timeout
;
233 hash_ip6_data_equal(const struct hash_ip6_elem
*ip1
,
234 const struct hash_ip6_elem
*ip2
,
237 return ipv6_addr_cmp(&ip1
->ip
.in6
, &ip2
->ip
.in6
) == 0;
241 hash_ip6_data_isnull(const struct hash_ip6_elem
*elem
)
243 return ipv6_addr_any(&elem
->ip
.in6
);
247 hash_ip6_data_copy(struct hash_ip6_elem
*dst
, const struct hash_ip6_elem
*src
)
249 dst
->ip
.in6
= src
->ip
.in6
;
253 hash_ip6_data_zero_out(struct hash_ip6_elem
*elem
)
255 ipv6_addr_set(&elem
->ip
.in6
, 0, 0, 0, 0);
259 ip6_netmask(union nf_inet_addr
*ip
, u8 prefix
)
261 ip
->ip6
[0] &= ip_set_netmask6(prefix
)[0];
262 ip
->ip6
[1] &= ip_set_netmask6(prefix
)[1];
263 ip
->ip6
[2] &= ip_set_netmask6(prefix
)[2];
264 ip
->ip6
[3] &= ip_set_netmask6(prefix
)[3];
268 hash_ip6_data_list(struct sk_buff
*skb
, const struct hash_ip6_elem
*data
)
270 if (nla_put_ipaddr6(skb
, IPSET_ATTR_IP
, &data
->ip
.in6
))
271 goto nla_put_failure
;
279 hash_ip6_data_tlist(struct sk_buff
*skb
, const struct hash_ip6_elem
*data
)
281 const struct hash_ip6_telem
*e
=
282 (const struct hash_ip6_telem
*)data
;
284 if (nla_put_ipaddr6(skb
, IPSET_ATTR_IP
, &e
->ip
.in6
) ||
285 nla_put_net32(skb
, IPSET_ATTR_TIMEOUT
,
286 htonl(ip_set_timeout_get(e
->timeout
))))
287 goto nla_put_failure
;
298 #define HOST_MASK 128
299 #include <linux/netfilter/ipset/ip_set_ahash.h>
302 hash_ip6_data_next(struct ip_set_hash
*h
, const struct hash_ip6_elem
*d
)
307 hash_ip6_kadt(struct ip_set
*set
, const struct sk_buff
*skb
,
308 const struct xt_action_param
*par
,
309 enum ipset_adt adt
, const struct ip_set_adt_opt
*opt
)
311 const struct ip_set_hash
*h
= set
->data
;
312 ipset_adtfn adtfn
= set
->variant
->adt
[adt
];
313 union nf_inet_addr ip
;
315 ip6addrptr(skb
, opt
->flags
& IPSET_DIM_ONE_SRC
, &ip
.in6
);
316 ip6_netmask(&ip
, h
->netmask
);
317 if (ipv6_addr_any(&ip
.in6
))
320 return adtfn(set
, &ip
, opt_timeout(opt
, h
), opt
->cmdflags
);
323 static const struct nla_policy hash_ip6_adt_policy
[IPSET_ATTR_ADT_MAX
+ 1] = {
324 [IPSET_ATTR_IP
] = { .type
= NLA_NESTED
},
325 [IPSET_ATTR_TIMEOUT
] = { .type
= NLA_U32
},
326 [IPSET_ATTR_LINENO
] = { .type
= NLA_U32
},
330 hash_ip6_uadt(struct ip_set
*set
, struct nlattr
*tb
[],
331 enum ipset_adt adt
, u32
*lineno
, u32 flags
, bool retried
)
333 const struct ip_set_hash
*h
= set
->data
;
334 ipset_adtfn adtfn
= set
->variant
->adt
[adt
];
335 union nf_inet_addr ip
;
336 u32 timeout
= h
->timeout
;
339 if (unlikely(!tb
[IPSET_ATTR_IP
] ||
340 !ip_set_optattr_netorder(tb
, IPSET_ATTR_TIMEOUT
) ||
341 tb
[IPSET_ATTR_IP_TO
] ||
342 tb
[IPSET_ATTR_CIDR
]))
343 return -IPSET_ERR_PROTOCOL
;
345 if (tb
[IPSET_ATTR_LINENO
])
346 *lineno
= nla_get_u32(tb
[IPSET_ATTR_LINENO
]);
348 ret
= ip_set_get_ipaddr6(tb
[IPSET_ATTR_IP
], &ip
);
352 ip6_netmask(&ip
, h
->netmask
);
353 if (ipv6_addr_any(&ip
.in6
))
354 return -IPSET_ERR_HASH_ELEM
;
356 if (tb
[IPSET_ATTR_TIMEOUT
]) {
357 if (!with_timeout(h
->timeout
))
358 return -IPSET_ERR_TIMEOUT
;
359 timeout
= ip_set_timeout_uget(tb
[IPSET_ATTR_TIMEOUT
]);
362 ret
= adtfn(set
, &ip
, timeout
, flags
);
364 return ip_set_eexist(ret
, flags
) ? 0 : ret
;
367 /* Create hash:ip type of sets */
370 hash_ip_create(struct ip_set
*set
, struct nlattr
*tb
[], u32 flags
)
372 u32 hashsize
= IPSET_DEFAULT_HASHSIZE
, maxelem
= IPSET_DEFAULT_MAXELEM
;
375 struct ip_set_hash
*h
;
377 if (!(set
->family
== NFPROTO_IPV4
|| set
->family
== NFPROTO_IPV6
))
378 return -IPSET_ERR_INVALID_FAMILY
;
379 netmask
= set
->family
== NFPROTO_IPV4
? 32 : 128;
380 pr_debug("Create set %s with family %s\n",
381 set
->name
, set
->family
== NFPROTO_IPV4
? "inet" : "inet6");
383 if (unlikely(!ip_set_optattr_netorder(tb
, IPSET_ATTR_HASHSIZE
) ||
384 !ip_set_optattr_netorder(tb
, IPSET_ATTR_MAXELEM
) ||
385 !ip_set_optattr_netorder(tb
, IPSET_ATTR_TIMEOUT
)))
386 return -IPSET_ERR_PROTOCOL
;
388 if (tb
[IPSET_ATTR_HASHSIZE
]) {
389 hashsize
= ip_set_get_h32(tb
[IPSET_ATTR_HASHSIZE
]);
390 if (hashsize
< IPSET_MIMINAL_HASHSIZE
)
391 hashsize
= IPSET_MIMINAL_HASHSIZE
;
394 if (tb
[IPSET_ATTR_MAXELEM
])
395 maxelem
= ip_set_get_h32(tb
[IPSET_ATTR_MAXELEM
]);
397 if (tb
[IPSET_ATTR_NETMASK
]) {
398 netmask
= nla_get_u8(tb
[IPSET_ATTR_NETMASK
]);
400 if ((set
->family
== NFPROTO_IPV4
&& netmask
> 32) ||
401 (set
->family
== NFPROTO_IPV6
&& netmask
> 128) ||
403 return -IPSET_ERR_INVALID_NETMASK
;
406 h
= kzalloc(sizeof(*h
), GFP_KERNEL
);
410 h
->maxelem
= maxelem
;
411 h
->netmask
= netmask
;
412 get_random_bytes(&h
->initval
, sizeof(h
->initval
));
413 h
->timeout
= IPSET_NO_TIMEOUT
;
415 hbits
= htable_bits(hashsize
);
416 hsize
= htable_size(hbits
);
421 h
->table
= ip_set_alloc(hsize
);
426 h
->table
->htable_bits
= hbits
;
430 if (tb
[IPSET_ATTR_TIMEOUT
]) {
431 h
->timeout
= ip_set_timeout_uget(tb
[IPSET_ATTR_TIMEOUT
]);
433 set
->variant
= set
->family
== NFPROTO_IPV4
434 ? &hash_ip4_tvariant
: &hash_ip6_tvariant
;
436 if (set
->family
== NFPROTO_IPV4
)
437 hash_ip4_gc_init(set
);
439 hash_ip6_gc_init(set
);
441 set
->variant
= set
->family
== NFPROTO_IPV4
442 ? &hash_ip4_variant
: &hash_ip6_variant
;
445 pr_debug("create %s hashsize %u (%u) maxelem %u: %p(%p)\n",
446 set
->name
, jhash_size(h
->table
->htable_bits
),
447 h
->table
->htable_bits
, h
->maxelem
, set
->data
, h
->table
);
452 static struct ip_set_type hash_ip_type __read_mostly
= {
454 .protocol
= IPSET_PROTOCOL
,
455 .features
= IPSET_TYPE_IP
,
456 .dimension
= IPSET_DIM_ONE
,
457 .family
= NFPROTO_UNSPEC
,
458 .revision_min
= REVISION_MIN
,
459 .revision_max
= REVISION_MAX
,
460 .create
= hash_ip_create
,
462 [IPSET_ATTR_HASHSIZE
] = { .type
= NLA_U32
},
463 [IPSET_ATTR_MAXELEM
] = { .type
= NLA_U32
},
464 [IPSET_ATTR_PROBES
] = { .type
= NLA_U8
},
465 [IPSET_ATTR_RESIZE
] = { .type
= NLA_U8
},
466 [IPSET_ATTR_TIMEOUT
] = { .type
= NLA_U32
},
467 [IPSET_ATTR_NETMASK
] = { .type
= NLA_U8
},
470 [IPSET_ATTR_IP
] = { .type
= NLA_NESTED
},
471 [IPSET_ATTR_IP_TO
] = { .type
= NLA_NESTED
},
472 [IPSET_ATTR_CIDR
] = { .type
= NLA_U8
},
473 [IPSET_ATTR_TIMEOUT
] = { .type
= NLA_U32
},
474 [IPSET_ATTR_LINENO
] = { .type
= NLA_U32
},
482 return ip_set_type_register(&hash_ip_type
);
488 ip_set_type_unregister(&hash_ip_type
);
491 module_init(hash_ip_init
);
492 module_exit(hash_ip_fini
);