1 /* Copyright (C) 2003-2013 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_hash.h>
26 #define IPSET_TYPE_REV_MIN 0
27 /* 1 Counters support */
28 /* 2 Comments support */
29 #define IPSET_TYPE_REV_MAX 3 /* Forceadd support */
31 MODULE_LICENSE("GPL");
32 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
33 IP_SET_MODULE_DESC("hash:ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
34 MODULE_ALIAS("ip_set_hash:ip");
36 /* Type specific function prefix */
38 #define IP_SET_HASH_WITH_NETMASK
43 struct hash_ip4_elem {
44 /* Zero valued IP addresses cannot be stored */
48 /* Common functions */
51 hash_ip4_data_equal(const struct hash_ip4_elem *e1,
52 const struct hash_ip4_elem *e2,
55 return e1->ip == e2->ip;
59 hash_ip4_data_list(struct sk_buff *skb, const struct hash_ip4_elem *e)
61 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, e->ip))
70 hash_ip4_data_next(struct hash_ip4_elem *next, const struct hash_ip4_elem *e)
75 #define MTYPE hash_ip4
78 #include "ip_set_hash_gen.h"
81 hash_ip4_kadt(struct ip_set *set, const struct sk_buff *skb,
82 const struct xt_action_param *par,
83 enum ipset_adt adt, struct ip_set_adt_opt *opt)
85 const struct hash_ip *h = set->data;
86 ipset_adtfn adtfn = set->variant->adt[adt];
87 struct hash_ip4_elem e = {};
88 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
91 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &ip);
92 ip &= ip_set_netmask(h->netmask);
97 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
101 hash_ip4_uadt(struct ip_set *set, struct nlattr *tb[],
102 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
104 const struct hash_ip *h = set->data;
105 ipset_adtfn adtfn = set->variant->adt[adt];
106 struct hash_ip4_elem e = {};
107 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
108 u32 ip = 0, ip_to = 0, hosts;
111 if (unlikely(!tb[IPSET_ATTR_IP] ||
112 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
113 !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
114 !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
115 return -IPSET_ERR_PROTOCOL;
117 if (tb[IPSET_ATTR_LINENO])
118 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
120 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip) ||
121 ip_set_get_extensions(set, tb, &ext);
125 ip &= ip_set_hostmask(h->netmask);
127 if (adt == IPSET_TEST) {
130 return -IPSET_ERR_HASH_ELEM;
131 return adtfn(set, &e, &ext, &ext, flags);
135 if (tb[IPSET_ATTR_IP_TO]) {
136 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
141 } else if (tb[IPSET_ATTR_CIDR]) {
142 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
144 if (!cidr || cidr > 32)
145 return -IPSET_ERR_INVALID_CIDR;
146 ip_set_mask_from_to(ip, ip_to, cidr);
149 hosts = h->netmask == 32 ? 1 : 2 << (32 - h->netmask - 1);
152 ip = ntohl(h->next.ip);
153 for (; !before(ip_to, ip); ip += hosts) {
156 return -IPSET_ERR_HASH_ELEM;
157 ret = adtfn(set, &e, &ext, &ext, flags);
159 if (ret && !ip_set_eexist(ret, flags))
169 /* Member elements */
170 struct hash_ip6_elem {
171 union nf_inet_addr ip;
174 /* Common functions */
177 hash_ip6_data_equal(const struct hash_ip6_elem *ip1,
178 const struct hash_ip6_elem *ip2,
181 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6);
185 hash_ip6_netmask(union nf_inet_addr *ip, u8 prefix)
187 ip6_netmask(ip, prefix);
191 hash_ip6_data_list(struct sk_buff *skb, const struct hash_ip6_elem *e)
193 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6))
194 goto nla_put_failure;
202 hash_ip6_data_next(struct hash_ip4_elem *next, const struct hash_ip6_elem *e)
211 #define MTYPE hash_ip6
213 #define HOST_MASK 128
215 #define IP_SET_EMIT_CREATE
216 #include "ip_set_hash_gen.h"
219 hash_ip6_kadt(struct ip_set *set, const struct sk_buff *skb,
220 const struct xt_action_param *par,
221 enum ipset_adt adt, struct ip_set_adt_opt *opt)
223 const struct hash_ip *h = set->data;
224 ipset_adtfn adtfn = set->variant->adt[adt];
225 struct hash_ip6_elem e = {};
226 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
228 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
229 hash_ip6_netmask(&e.ip, h->netmask);
230 if (ipv6_addr_any(&e.ip.in6))
233 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
237 hash_ip6_uadt(struct ip_set *set, struct nlattr *tb[],
238 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
240 const struct hash_ip *h = set->data;
241 ipset_adtfn adtfn = set->variant->adt[adt];
242 struct hash_ip6_elem e = {};
243 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
246 if (unlikely(!tb[IPSET_ATTR_IP] ||
247 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
248 !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
249 !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
250 tb[IPSET_ATTR_IP_TO] ||
251 tb[IPSET_ATTR_CIDR]))
252 return -IPSET_ERR_PROTOCOL;
254 if (tb[IPSET_ATTR_LINENO])
255 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
257 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) ||
258 ip_set_get_extensions(set, tb, &ext);
262 hash_ip6_netmask(&e.ip, h->netmask);
263 if (ipv6_addr_any(&e.ip.in6))
264 return -IPSET_ERR_HASH_ELEM;
266 ret = adtfn(set, &e, &ext, &ext, flags);
268 return ip_set_eexist(ret, flags) ? 0 : ret;
271 static struct ip_set_type hash_ip_type __read_mostly = {
273 .protocol = IPSET_PROTOCOL,
274 .features = IPSET_TYPE_IP,
275 .dimension = IPSET_DIM_ONE,
276 .family = NFPROTO_UNSPEC,
277 .revision_min = IPSET_TYPE_REV_MIN,
278 .revision_max = IPSET_TYPE_REV_MAX,
279 .create = hash_ip_create,
281 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
282 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
283 [IPSET_ATTR_PROBES] = { .type = NLA_U8 },
284 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
285 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
286 [IPSET_ATTR_NETMASK] = { .type = NLA_U8 },
287 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
290 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
291 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
292 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
293 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
294 [IPSET_ATTR_LINENO] = { .type = NLA_U32 },
295 [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
296 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
297 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING },
305 return ip_set_type_register(&hash_ip_type);
311 ip_set_type_unregister(&hash_ip_type);
314 module_init(hash_ip_init);
315 module_exit(hash_ip_fini);