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5
6#include <linux/jhash.h>
7#include <linux/module.h>
8#include <linux/ip.h>
9#include <linux/skbuff.h>
10#include <linux/errno.h>
11#include <linux/random.h>
12#include <net/ip.h>
13#include <net/ipv6.h>
14#include <net/netlink.h>
15#include <net/tcp.h>
16
17#include <linux/netfilter.h>
18#include <linux/netfilter/ipset/pfxlen.h>
19#include <linux/netfilter/ipset/ip_set.h>
20#include <linux/netfilter/ipset/ip_set_hash.h>
21
22#define IPSET_TYPE_REV_MIN 0
23
24
25
26#define IPSET_TYPE_REV_MAX 4
27
28MODULE_LICENSE("GPL");
29MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>");
30IP_SET_MODULE_DESC("hash:ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
31MODULE_ALIAS("ip_set_hash:ip");
32
33
34#define HTYPE hash_ip
35#define IP_SET_HASH_WITH_NETMASK
36
37
38
39
40struct hash_ip4_elem {
41
42 __be32 ip;
43};
44
45
46
47static inline bool
48hash_ip4_data_equal(const struct hash_ip4_elem *e1,
49 const struct hash_ip4_elem *e2,
50 u32 *multi)
51{
52 return e1->ip == e2->ip;
53}
54
55static bool
56hash_ip4_data_list(struct sk_buff *skb, const struct hash_ip4_elem *e)
57{
58 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, e->ip))
59 goto nla_put_failure;
60 return false;
61
62nla_put_failure:
63 return true;
64}
65
66static inline void
67hash_ip4_data_next(struct hash_ip4_elem *next, const struct hash_ip4_elem *e)
68{
69 next->ip = e->ip;
70}
71
72#define MTYPE hash_ip4
73#define HOST_MASK 32
74#include "ip_set_hash_gen.h"
75
76static int
77hash_ip4_kadt(struct ip_set *set, const struct sk_buff *skb,
78 const struct xt_action_param *par,
79 enum ipset_adt adt, struct ip_set_adt_opt *opt)
80{
81 const struct hash_ip4 *h = set->data;
82 ipset_adtfn adtfn = set->variant->adt[adt];
83 struct hash_ip4_elem e = { 0 };
84 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
85 __be32 ip;
86
87 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &ip);
88 ip &= ip_set_netmask(h->netmask);
89 if (ip == 0)
90 return -EINVAL;
91
92 e.ip = ip;
93 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
94}
95
96static int
97hash_ip4_uadt(struct ip_set *set, struct nlattr *tb[],
98 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
99{
100 const struct hash_ip4 *h = set->data;
101 ipset_adtfn adtfn = set->variant->adt[adt];
102 struct hash_ip4_elem e = { 0 };
103 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
104 u32 ip = 0, ip_to = 0, hosts;
105 int ret = 0;
106
107 if (tb[IPSET_ATTR_LINENO])
108 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
109
110 if (unlikely(!tb[IPSET_ATTR_IP]))
111 return -IPSET_ERR_PROTOCOL;
112
113 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
114 if (ret)
115 return ret;
116
117 ret = ip_set_get_extensions(set, tb, &ext);
118 if (ret)
119 return ret;
120
121 ip &= ip_set_hostmask(h->netmask);
122 e.ip = htonl(ip);
123 if (e.ip == 0)
124 return -IPSET_ERR_HASH_ELEM;
125
126 if (adt == IPSET_TEST)
127 return adtfn(set, &e, &ext, &ext, flags);
128
129 ip_to = ip;
130 if (tb[IPSET_ATTR_IP_TO]) {
131 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
132 if (ret)
133 return ret;
134 if (ip > ip_to)
135 swap(ip, ip_to);
136 } else if (tb[IPSET_ATTR_CIDR]) {
137 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
138
139 if (!cidr || cidr > HOST_MASK)
140 return -IPSET_ERR_INVALID_CIDR;
141 ip_set_mask_from_to(ip, ip_to, cidr);
142 }
143
144 hosts = h->netmask == 32 ? 1 : 2 << (32 - h->netmask - 1);
145
146 if (retried) {
147 ip = ntohl(h->next.ip);
148 e.ip = htonl(ip);
149 }
150 for (; ip <= ip_to;) {
151 ret = adtfn(set, &e, &ext, &ext, flags);
152 if (ret && !ip_set_eexist(ret, flags))
153 return ret;
154
155 ip += hosts;
156 e.ip = htonl(ip);
157 if (e.ip == 0)
158 return 0;
159
160 ret = 0;
161 }
162 return ret;
163}
164
165
166
167
168struct hash_ip6_elem {
169 union nf_inet_addr ip;
170};
171
172
173
174static inline bool
175hash_ip6_data_equal(const struct hash_ip6_elem *ip1,
176 const struct hash_ip6_elem *ip2,
177 u32 *multi)
178{
179 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6);
180}
181
182static inline void
183hash_ip6_netmask(union nf_inet_addr *ip, u8 prefix)
184{
185 ip6_netmask(ip, prefix);
186}
187
188static bool
189hash_ip6_data_list(struct sk_buff *skb, const struct hash_ip6_elem *e)
190{
191 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6))
192 goto nla_put_failure;
193 return false;
194
195nla_put_failure:
196 return true;
197}
198
199static inline void
200hash_ip6_data_next(struct hash_ip6_elem *next, const struct hash_ip6_elem *e)
201{
202}
203
204#undef MTYPE
205#undef HOST_MASK
206
207#define MTYPE hash_ip6
208#define HOST_MASK 128
209
210#define IP_SET_EMIT_CREATE
211#include "ip_set_hash_gen.h"
212
213static int
214hash_ip6_kadt(struct ip_set *set, const struct sk_buff *skb,
215 const struct xt_action_param *par,
216 enum ipset_adt adt, struct ip_set_adt_opt *opt)
217{
218 const struct hash_ip6 *h = set->data;
219 ipset_adtfn adtfn = set->variant->adt[adt];
220 struct hash_ip6_elem e = { { .all = { 0 } } };
221 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
222
223 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
224 hash_ip6_netmask(&e.ip, h->netmask);
225 if (ipv6_addr_any(&e.ip.in6))
226 return -EINVAL;
227
228 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
229}
230
231static int
232hash_ip6_uadt(struct ip_set *set, struct nlattr *tb[],
233 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
234{
235 const struct hash_ip6 *h = set->data;
236 ipset_adtfn adtfn = set->variant->adt[adt];
237 struct hash_ip6_elem e = { { .all = { 0 } } };
238 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
239 int ret;
240
241 if (tb[IPSET_ATTR_LINENO])
242 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
243
244 if (unlikely(!tb[IPSET_ATTR_IP]))
245 return -IPSET_ERR_PROTOCOL;
246 if (unlikely(tb[IPSET_ATTR_IP_TO]))
247 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
248 if (unlikely(tb[IPSET_ATTR_CIDR])) {
249 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
250
251 if (cidr != HOST_MASK)
252 return -IPSET_ERR_INVALID_CIDR;
253 }
254
255 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
256 if (ret)
257 return ret;
258
259 ret = ip_set_get_extensions(set, tb, &ext);
260 if (ret)
261 return ret;
262
263 hash_ip6_netmask(&e.ip, h->netmask);
264 if (ipv6_addr_any(&e.ip.in6))
265 return -IPSET_ERR_HASH_ELEM;
266
267 ret = adtfn(set, &e, &ext, &ext, flags);
268
269 return ip_set_eexist(ret, flags) ? 0 : ret;
270}
271
272static struct ip_set_type hash_ip_type __read_mostly = {
273 .name = "hash:ip",
274 .protocol = IPSET_PROTOCOL,
275 .features = IPSET_TYPE_IP,
276 .dimension = IPSET_DIM_ONE,
277 .family = NFPROTO_UNSPEC,
278 .revision_min = IPSET_TYPE_REV_MIN,
279 .revision_max = IPSET_TYPE_REV_MAX,
280 .create = hash_ip_create,
281 .create_policy = {
282 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
283 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
284 [IPSET_ATTR_PROBES] = { .type = NLA_U8 },
285 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
286 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
287 [IPSET_ATTR_NETMASK] = { .type = NLA_U8 },
288 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
289 },
290 .adt_policy = {
291 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
292 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
293 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
294 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
295 [IPSET_ATTR_LINENO] = { .type = NLA_U32 },
296 [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
297 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
298 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING,
299 .len = IPSET_MAX_COMMENT_SIZE },
300 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 },
301 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 },
302 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 },
303 },
304 .me = THIS_MODULE,
305};
306
307static int __init
308hash_ip_init(void)
309{
310 return ip_set_type_register(&hash_ip_type);
311}
312
313static void __exit
314hash_ip_fini(void)
315{
316 rcu_barrier();
317 ip_set_type_unregister(&hash_ip_type);
318}
319
320module_init(hash_ip_init);
321module_exit(hash_ip_fini);
322
