1 /* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
2 *
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.
6 */
7
8 /* Kernel module implementing an IP set type: the hash:ip type */
9
10 #include <linux/jhash.h>
11 #include <linux/module.h>
12 #include <linux/ip.h>
13 #include <linux/skbuff.h>
14 #include <linux/errno.h>
15 #include <linux/random.h>
16 #include <net/ip.h>
17 #include <net/ipv6.h>
18 #include <net/netlink.h>
19 #include <net/tcp.h>
20
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>
25
26 #define IPSET_TYPE_REV_MIN 0
27 /* 1 Counters support */
28 #define IPSET_TYPE_REV_MAX 2 /* Comments support */
29
30 MODULE_LICENSE("GPL");
31 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
32 IP_SET_MODULE_DESC("hash:ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
33 MODULE_ALIAS("ip_set_hash:ip");
34
35 /* Type specific function prefix */
36 #define HTYPE hash_ip
37 #define IP_SET_HASH_WITH_NETMASK
38
39 /* IPv4 variant */
40
41 /* Member elements */
42 struct hash_ip4_elem {
43 /* Zero valued IP addresses cannot be stored */
44 __be32 ip;
45 };
46
47 /* Common functions */
48
49 static inline bool
50 hash_ip4_data_equal(const struct hash_ip4_elem *e1,
51 const struct hash_ip4_elem *e2,
52 u32 *multi)
53 {
54 return e1->ip == e2->ip;
55 }
56
57 static inline bool
58 hash_ip4_data_list(struct sk_buff *skb, const struct hash_ip4_elem *e)
59 {
60 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, e->ip))
61 goto nla_put_failure;
62 return 0;
63
64 nla_put_failure:
65 return 1;
66 }
67
68 static inline void
69 hash_ip4_data_next(struct hash_ip4_elem *next, const struct hash_ip4_elem *e)
70 {
71 next->ip = e->ip;
72 }
73
74 #define MTYPE hash_ip4
75 #define PF 4
76 #define HOST_MASK 32
77 #include "ip_set_hash_gen.h"
78
79 static int
80 hash_ip4_kadt(struct ip_set *set, const struct sk_buff *skb,
81 const struct xt_action_param *par,
82 enum ipset_adt adt, struct ip_set_adt_opt *opt)
83 {
84 const struct hash_ip *h = set->data;
85 ipset_adtfn adtfn = set->variant->adt[adt];
86 struct hash_ip4_elem e = {};
87 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
88 __be32 ip;
89
90 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &ip);
91 ip &= ip_set_netmask(h->netmask);
92 if (ip == 0)
93 return -EINVAL;
94
95 e.ip = ip;
96 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
97 }
98
99 static int
100 hash_ip4_uadt(struct ip_set *set, struct nlattr *tb[],
101 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
102 {
103 const struct hash_ip *h = set->data;
104 ipset_adtfn adtfn = set->variant->adt[adt];
105 struct hash_ip4_elem e = {};
106 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
107 u32 ip = 0, ip_to = 0, hosts;
108 int ret = 0;
109
110 if (unlikely(!tb[IPSET_ATTR_IP] ||
111 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
112 !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
113 !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
114 return -IPSET_ERR_PROTOCOL;
115
116 if (tb[IPSET_ATTR_LINENO])
117 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
118
119 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip) ||
120 ip_set_get_extensions(set, tb, &ext);
121 if (ret)
122 return ret;
123
124 ip &= ip_set_hostmask(h->netmask);
125
126 if (adt == IPSET_TEST) {
127 e.ip = htonl(ip);
128 if (e.ip == 0)
129 return -IPSET_ERR_HASH_ELEM;
130 return adtfn(set, &e, &ext, &ext, flags);
131 }
132
133 ip_to = ip;
134 if (tb[IPSET_ATTR_IP_TO]) {
135 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
136 if (ret)
137 return ret;
138 if (ip > ip_to)
139 swap(ip, ip_to);
140 } else if (tb[IPSET_ATTR_CIDR]) {
141 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
142
143 if (!cidr || cidr > 32)
144 return -IPSET_ERR_INVALID_CIDR;
145 ip_set_mask_from_to(ip, ip_to, cidr);
146 }
147
148 hosts = h->netmask == 32 ? 1 : 2 << (32 - h->netmask - 1);
149
150 if (retried)
151 ip = ntohl(h->next.ip);
152 for (; !before(ip_to, ip); ip += hosts) {
153 e.ip = htonl(ip);
154 if (e.ip == 0)
155 return -IPSET_ERR_HASH_ELEM;
156 ret = adtfn(set, &e, &ext, &ext, flags);
157
158 if (ret && !ip_set_eexist(ret, flags))
159 return ret;
160 else
161 ret = 0;
162 }
163 return ret;
164 }
165
166 /* IPv6 variant */
167
168 /* Member elements */
169 struct hash_ip6_elem {
170 union nf_inet_addr ip;
171 };
172
173 /* Common functions */
174
175 static inline bool
176 hash_ip6_data_equal(const struct hash_ip6_elem *ip1,
177 const struct hash_ip6_elem *ip2,
178 u32 *multi)
179 {
180 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6);
181 }
182
183 static inline void
184 hash_ip6_netmask(union nf_inet_addr *ip, u8 prefix)
185 {
186 ip6_netmask(ip, prefix);
187 }
188
189 static bool
190 hash_ip6_data_list(struct sk_buff *skb, const struct hash_ip6_elem *e)
191 {
192 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6))
193 goto nla_put_failure;
194 return 0;
195
196 nla_put_failure:
197 return 1;
198 }
199
200 static inline void
201 hash_ip6_data_next(struct hash_ip4_elem *next, const struct hash_ip6_elem *e)
202 {
203 }
204
205 #undef MTYPE
206 #undef PF
207 #undef HOST_MASK
208 #undef HKEY_DATALEN
209
210 #define MTYPE hash_ip6
211 #define PF 6
212 #define HOST_MASK 128
213
214 #define IP_SET_EMIT_CREATE
215 #include "ip_set_hash_gen.h"
216
217 static int
218 hash_ip6_kadt(struct ip_set *set, const struct sk_buff *skb,
219 const struct xt_action_param *par,
220 enum ipset_adt adt, struct ip_set_adt_opt *opt)
221 {
222 const struct hash_ip *h = set->data;
223 ipset_adtfn adtfn = set->variant->adt[adt];
224 struct hash_ip6_elem e = {};
225 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
226
227 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
228 hash_ip6_netmask(&e.ip, h->netmask);
229 if (ipv6_addr_any(&e.ip.in6))
230 return -EINVAL;
231
232 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
233 }
234
235 static int
236 hash_ip6_uadt(struct ip_set *set, struct nlattr *tb[],
237 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
238 {
239 const struct hash_ip *h = set->data;
240 ipset_adtfn adtfn = set->variant->adt[adt];
241 struct hash_ip6_elem e = {};
242 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
243 int ret;
244
245 if (unlikely(!tb[IPSET_ATTR_IP] ||
246 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
247 !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
248 !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
249 tb[IPSET_ATTR_IP_TO] ||
250 tb[IPSET_ATTR_CIDR]))
251 return -IPSET_ERR_PROTOCOL;
252
253 if (tb[IPSET_ATTR_LINENO])
254 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
255
256 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) ||
257 ip_set_get_extensions(set, tb, &ext);
258 if (ret)
259 return ret;
260
261 hash_ip6_netmask(&e.ip, h->netmask);
262 if (ipv6_addr_any(&e.ip.in6))
263 return -IPSET_ERR_HASH_ELEM;
264
265 ret = adtfn(set, &e, &ext, &ext, flags);
266
267 return ip_set_eexist(ret, flags) ? 0 : ret;
268 }
269
270 static struct ip_set_type hash_ip_type __read_mostly = {
271 .name = "hash:ip",
272 .protocol = IPSET_PROTOCOL,
273 .features = IPSET_TYPE_IP,
274 .dimension = IPSET_DIM_ONE,
275 .family = NFPROTO_UNSPEC,
276 .revision_min = IPSET_TYPE_REV_MIN,
277 .revision_max = IPSET_TYPE_REV_MAX,
278 .create = hash_ip_create,
279 .create_policy = {
280 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
281 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
282 [IPSET_ATTR_PROBES] = { .type = NLA_U8 },
283 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
284 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
285 [IPSET_ATTR_NETMASK] = { .type = NLA_U8 },
286 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
287 },
288 .adt_policy = {
289 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
290 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
291 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
292 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
293 [IPSET_ATTR_LINENO] = { .type = NLA_U32 },
294 [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
295 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
296 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING },
297 },
298 .me = THIS_MODULE,
299 };
300
301 static int __init
302 hash_ip_init(void)
303 {
304 return ip_set_type_register(&hash_ip_type);
305 }
306
307 static void __exit
308 hash_ip_fini(void)
309 {
310 ip_set_type_unregister(&hash_ip_type);
311 }
312
313 module_init(hash_ip_init);
314 module_exit(hash_ip_fini);
315
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