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 /* 2 Comments support */
29 /* 3 Forceadd support */
30 #define IPSET_TYPE_REV_MAX 4 /* skbinfo support */
31
32 MODULE_LICENSE("GPL");
33 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
34 IP_SET_MODULE_DESC("hash:ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
35 MODULE_ALIAS("ip_set_hash:ip");
36
37 /* Type specific function prefix */
38 #define HTYPE hash_ip
39 #define IP_SET_HASH_WITH_NETMASK
40
41 /* IPv4 variant */
42
43 /* Member elements */
44 struct hash_ip4_elem {
45 /* Zero valued IP addresses cannot be stored */
46 __be32 ip;
47 };
48
49 /* Common functions */
50
51 static inline bool
hash_ip4_data_equal(const struct hash_ip4_elem * e1,const struct hash_ip4_elem * e2,u32 * multi)52 hash_ip4_data_equal(const struct hash_ip4_elem *e1,
53 const struct hash_ip4_elem *e2,
54 u32 *multi)
55 {
56 return e1->ip == e2->ip;
57 }
58
59 static inline bool
hash_ip4_data_list(struct sk_buff * skb,const struct hash_ip4_elem * e)60 hash_ip4_data_list(struct sk_buff *skb, const struct hash_ip4_elem *e)
61 {
62 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, e->ip))
63 goto nla_put_failure;
64 return 0;
65
66 nla_put_failure:
67 return 1;
68 }
69
70 static inline void
hash_ip4_data_next(struct hash_ip4_elem * next,const struct hash_ip4_elem * e)71 hash_ip4_data_next(struct hash_ip4_elem *next, const struct hash_ip4_elem *e)
72 {
73 next->ip = e->ip;
74 }
75
76 #define MTYPE hash_ip4
77 #define PF 4
78 #define HOST_MASK 32
79 #include "ip_set_hash_gen.h"
80
81 static int
hash_ip4_kadt(struct ip_set * set,const struct sk_buff * skb,const struct xt_action_param * par,enum ipset_adt adt,struct ip_set_adt_opt * opt)82 hash_ip4_kadt(struct ip_set *set, const struct sk_buff *skb,
83 const struct xt_action_param *par,
84 enum ipset_adt adt, struct ip_set_adt_opt *opt)
85 {
86 const struct hash_ip *h = set->data;
87 ipset_adtfn adtfn = set->variant->adt[adt];
88 struct hash_ip4_elem e = { 0 };
89 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
90 __be32 ip;
91
92 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &ip);
93 ip &= ip_set_netmask(h->netmask);
94 if (ip == 0)
95 return -EINVAL;
96
97 e.ip = ip;
98 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
99 }
100
101 static int
hash_ip4_uadt(struct ip_set * set,struct nlattr * tb[],enum ipset_adt adt,u32 * lineno,u32 flags,bool retried)102 hash_ip4_uadt(struct ip_set *set, struct nlattr *tb[],
103 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
104 {
105 const struct hash_ip *h = set->data;
106 ipset_adtfn adtfn = set->variant->adt[adt];
107 struct hash_ip4_elem e = { 0 };
108 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
109 u32 ip = 0, ip_to = 0, hosts;
110 int ret = 0;
111
112 if (unlikely(!tb[IPSET_ATTR_IP] ||
113 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
114 !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
115 !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
116 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) ||
117 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) ||
118 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE)))
119 return -IPSET_ERR_PROTOCOL;
120
121 if (tb[IPSET_ATTR_LINENO])
122 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
123
124 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip) ||
125 ip_set_get_extensions(set, tb, &ext);
126 if (ret)
127 return ret;
128
129 ip &= ip_set_hostmask(h->netmask);
130
131 if (adt == IPSET_TEST) {
132 e.ip = htonl(ip);
133 if (e.ip == 0)
134 return -IPSET_ERR_HASH_ELEM;
135 return adtfn(set, &e, &ext, &ext, flags);
136 }
137
138 ip_to = ip;
139 if (tb[IPSET_ATTR_IP_TO]) {
140 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
141 if (ret)
142 return ret;
143 if (ip > ip_to)
144 swap(ip, ip_to);
145 } else if (tb[IPSET_ATTR_CIDR]) {
146 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
147
148 if (!cidr || cidr > 32)
149 return -IPSET_ERR_INVALID_CIDR;
150 ip_set_mask_from_to(ip, ip_to, cidr);
151 }
152
153 hosts = h->netmask == 32 ? 1 : 2 << (32 - h->netmask - 1);
154
155 if (retried)
156 ip = ntohl(h->next.ip);
157 for (; !before(ip_to, ip); ip += hosts) {
158 e.ip = htonl(ip);
159 if (e.ip == 0)
160 return -IPSET_ERR_HASH_ELEM;
161 ret = adtfn(set, &e, &ext, &ext, flags);
162
163 if (ret && !ip_set_eexist(ret, flags))
164 return ret;
165 else
166 ret = 0;
167 }
168 return ret;
169 }
170
171 /* IPv6 variant */
172
173 /* Member elements */
174 struct hash_ip6_elem {
175 union nf_inet_addr ip;
176 };
177
178 /* Common functions */
179
180 static inline bool
hash_ip6_data_equal(const struct hash_ip6_elem * ip1,const struct hash_ip6_elem * ip2,u32 * multi)181 hash_ip6_data_equal(const struct hash_ip6_elem *ip1,
182 const struct hash_ip6_elem *ip2,
183 u32 *multi)
184 {
185 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6);
186 }
187
188 static inline void
hash_ip6_netmask(union nf_inet_addr * ip,u8 prefix)189 hash_ip6_netmask(union nf_inet_addr *ip, u8 prefix)
190 {
191 ip6_netmask(ip, prefix);
192 }
193
194 static bool
hash_ip6_data_list(struct sk_buff * skb,const struct hash_ip6_elem * e)195 hash_ip6_data_list(struct sk_buff *skb, const struct hash_ip6_elem *e)
196 {
197 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6))
198 goto nla_put_failure;
199 return 0;
200
201 nla_put_failure:
202 return 1;
203 }
204
205 static inline void
hash_ip6_data_next(struct hash_ip4_elem * next,const struct hash_ip6_elem * e)206 hash_ip6_data_next(struct hash_ip4_elem *next, const struct hash_ip6_elem *e)
207 {
208 }
209
210 #undef MTYPE
211 #undef PF
212 #undef HOST_MASK
213 #undef HKEY_DATALEN
214
215 #define MTYPE hash_ip6
216 #define PF 6
217 #define HOST_MASK 128
218
219 #define IP_SET_EMIT_CREATE
220 #include "ip_set_hash_gen.h"
221
222 static int
hash_ip6_kadt(struct ip_set * set,const struct sk_buff * skb,const struct xt_action_param * par,enum ipset_adt adt,struct ip_set_adt_opt * opt)223 hash_ip6_kadt(struct ip_set *set, const struct sk_buff *skb,
224 const struct xt_action_param *par,
225 enum ipset_adt adt, struct ip_set_adt_opt *opt)
226 {
227 const struct hash_ip *h = set->data;
228 ipset_adtfn adtfn = set->variant->adt[adt];
229 struct hash_ip6_elem e = { { .all = { 0 } } };
230 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
231
232 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
233 hash_ip6_netmask(&e.ip, h->netmask);
234 if (ipv6_addr_any(&e.ip.in6))
235 return -EINVAL;
236
237 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
238 }
239
240 static int
hash_ip6_uadt(struct ip_set * set,struct nlattr * tb[],enum ipset_adt adt,u32 * lineno,u32 flags,bool retried)241 hash_ip6_uadt(struct ip_set *set, struct nlattr *tb[],
242 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
243 {
244 const struct hash_ip *h = set->data;
245 ipset_adtfn adtfn = set->variant->adt[adt];
246 struct hash_ip6_elem e = { { .all = { 0 } } };
247 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
248 int ret;
249
250 if (unlikely(!tb[IPSET_ATTR_IP] ||
251 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
252 !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
253 !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
254 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) ||
255 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) ||
256 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE) ||
257 tb[IPSET_ATTR_IP_TO] ||
258 tb[IPSET_ATTR_CIDR]))
259 return -IPSET_ERR_PROTOCOL;
260
261 if (tb[IPSET_ATTR_LINENO])
262 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
263
264 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) ||
265 ip_set_get_extensions(set, tb, &ext);
266 if (ret)
267 return ret;
268
269 hash_ip6_netmask(&e.ip, h->netmask);
270 if (ipv6_addr_any(&e.ip.in6))
271 return -IPSET_ERR_HASH_ELEM;
272
273 ret = adtfn(set, &e, &ext, &ext, flags);
274
275 return ip_set_eexist(ret, flags) ? 0 : ret;
276 }
277
278 static struct ip_set_type hash_ip_type __read_mostly = {
279 .name = "hash:ip",
280 .protocol = IPSET_PROTOCOL,
281 .features = IPSET_TYPE_IP,
282 .dimension = IPSET_DIM_ONE,
283 .family = NFPROTO_UNSPEC,
284 .revision_min = IPSET_TYPE_REV_MIN,
285 .revision_max = IPSET_TYPE_REV_MAX,
286 .create = hash_ip_create,
287 .create_policy = {
288 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
289 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
290 [IPSET_ATTR_PROBES] = { .type = NLA_U8 },
291 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
292 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
293 [IPSET_ATTR_NETMASK] = { .type = NLA_U8 },
294 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
295 },
296 .adt_policy = {
297 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
298 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
299 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
300 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
301 [IPSET_ATTR_LINENO] = { .type = NLA_U32 },
302 [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
303 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
304 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING },
305 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 },
306 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 },
307 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 },
308 },
309 .me = THIS_MODULE,
310 };
311
312 static int __init
hash_ip_init(void)313 hash_ip_init(void)
314 {
315 return ip_set_type_register(&hash_ip_type);
316 }
317
318 static void __exit
hash_ip_fini(void)319 hash_ip_fini(void)
320 {
321 ip_set_type_unregister(&hash_ip_type);
322 }
323
324 module_init(hash_ip_init);
325 module_exit(hash_ip_fini);
326