1 /* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
2 * Copyright (C) 2013 Smoothwall Ltd. <vytas.dauksa@smoothwall.net>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9 /* Kernel module implementing an IP set type: the hash:ip,mark type */
10
11 #include <linux/jhash.h>
12 #include <linux/module.h>
13 #include <linux/ip.h>
14 #include <linux/skbuff.h>
15 #include <linux/errno.h>
16 #include <linux/random.h>
17 #include <net/ip.h>
18 #include <net/ipv6.h>
19 #include <net/netlink.h>
20 #include <net/tcp.h>
21
22 #include <linux/netfilter.h>
23 #include <linux/netfilter/ipset/pfxlen.h>
24 #include <linux/netfilter/ipset/ip_set.h>
25 #include <linux/netfilter/ipset/ip_set_hash.h>
26
27 #define IPSET_TYPE_REV_MIN 0
28 /* 1 Forceadd support */
29 #define IPSET_TYPE_REV_MAX 2 /* skbinfo support */
30
31 MODULE_LICENSE("GPL");
32 MODULE_AUTHOR("Vytas Dauksa <vytas.dauksa@smoothwall.net>");
33 IP_SET_MODULE_DESC("hash:ip,mark", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
34 MODULE_ALIAS("ip_set_hash:ip,mark");
35
36 /* Type specific function prefix */
37 #define HTYPE hash_ipmark
38 #define IP_SET_HASH_WITH_MARKMASK
39
40 /* IPv4 variant */
41
42 /* Member elements */
43 struct hash_ipmark4_elem {
44 __be32 ip;
45 __u32 mark;
46 };
47
48 /* Common functions */
49
50 static inline bool
hash_ipmark4_data_equal(const struct hash_ipmark4_elem * ip1,const struct hash_ipmark4_elem * ip2,u32 * multi)51 hash_ipmark4_data_equal(const struct hash_ipmark4_elem *ip1,
52 const struct hash_ipmark4_elem *ip2,
53 u32 *multi)
54 {
55 return ip1->ip == ip2->ip &&
56 ip1->mark == ip2->mark;
57 }
58
59 static bool
hash_ipmark4_data_list(struct sk_buff * skb,const struct hash_ipmark4_elem * data)60 hash_ipmark4_data_list(struct sk_buff *skb,
61 const struct hash_ipmark4_elem *data)
62 {
63 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
64 nla_put_net32(skb, IPSET_ATTR_MARK, htonl(data->mark)))
65 goto nla_put_failure;
66 return 0;
67
68 nla_put_failure:
69 return 1;
70 }
71
72 static inline void
hash_ipmark4_data_next(struct hash_ipmark4_elem * next,const struct hash_ipmark4_elem * d)73 hash_ipmark4_data_next(struct hash_ipmark4_elem *next,
74 const struct hash_ipmark4_elem *d)
75 {
76 next->ip = d->ip;
77 }
78
79 #define MTYPE hash_ipmark4
80 #define PF 4
81 #define HOST_MASK 32
82 #define HKEY_DATALEN sizeof(struct hash_ipmark4_elem)
83 #include "ip_set_hash_gen.h"
84
85 static int
hash_ipmark4_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)86 hash_ipmark4_kadt(struct ip_set *set, const struct sk_buff *skb,
87 const struct xt_action_param *par,
88 enum ipset_adt adt, struct ip_set_adt_opt *opt)
89 {
90 const struct hash_ipmark *h = set->data;
91 ipset_adtfn adtfn = set->variant->adt[adt];
92 struct hash_ipmark4_elem e = { };
93 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
94
95 e.mark = skb->mark;
96 e.mark &= h->markmask;
97
98 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
99 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
100 }
101
102 static int
hash_ipmark4_uadt(struct ip_set * set,struct nlattr * tb[],enum ipset_adt adt,u32 * lineno,u32 flags,bool retried)103 hash_ipmark4_uadt(struct ip_set *set, struct nlattr *tb[],
104 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
105 {
106 const struct hash_ipmark *h = set->data;
107 ipset_adtfn adtfn = set->variant->adt[adt];
108 struct hash_ipmark4_elem e = { };
109 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
110 u32 ip, ip_to = 0;
111 int ret;
112
113 if (unlikely(!tb[IPSET_ATTR_IP] ||
114 !ip_set_attr_netorder(tb, IPSET_ATTR_MARK) ||
115 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
116 !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
117 !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
118 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) ||
119 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) ||
120 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE)))
121 return -IPSET_ERR_PROTOCOL;
122
123 if (tb[IPSET_ATTR_LINENO])
124 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
125
126 ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip) ||
127 ip_set_get_extensions(set, tb, &ext);
128 if (ret)
129 return ret;
130
131 e.mark = ntohl(nla_get_u32(tb[IPSET_ATTR_MARK]));
132 e.mark &= h->markmask;
133
134 if (adt == IPSET_TEST ||
135 !(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR])) {
136 ret = adtfn(set, &e, &ext, &ext, flags);
137 return ip_set_eexist(ret, flags) ? 0 : ret;
138 }
139
140 ip_to = ip = ntohl(e.ip);
141 if (tb[IPSET_ATTR_IP_TO]) {
142 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
143 if (ret)
144 return ret;
145 if (ip > ip_to)
146 swap(ip, ip_to);
147 } else if (tb[IPSET_ATTR_CIDR]) {
148 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
149
150 if (!cidr || cidr > 32)
151 return -IPSET_ERR_INVALID_CIDR;
152 ip_set_mask_from_to(ip, ip_to, cidr);
153 }
154
155 if (retried)
156 ip = ntohl(h->next.ip);
157 for (; !before(ip_to, ip); ip++) {
158 e.ip = htonl(ip);
159 ret = adtfn(set, &e, &ext, &ext, flags);
160
161 if (ret && !ip_set_eexist(ret, flags))
162 return ret;
163 else
164 ret = 0;
165 }
166 return ret;
167 }
168
169 /* IPv6 variant */
170
171 struct hash_ipmark6_elem {
172 union nf_inet_addr ip;
173 __u32 mark;
174 };
175
176 /* Common functions */
177
178 static inline bool
hash_ipmark6_data_equal(const struct hash_ipmark6_elem * ip1,const struct hash_ipmark6_elem * ip2,u32 * multi)179 hash_ipmark6_data_equal(const struct hash_ipmark6_elem *ip1,
180 const struct hash_ipmark6_elem *ip2,
181 u32 *multi)
182 {
183 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
184 ip1->mark == ip2->mark;
185 }
186
187 static bool
hash_ipmark6_data_list(struct sk_buff * skb,const struct hash_ipmark6_elem * data)188 hash_ipmark6_data_list(struct sk_buff *skb,
189 const struct hash_ipmark6_elem *data)
190 {
191 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
192 nla_put_net32(skb, IPSET_ATTR_MARK, htonl(data->mark)))
193 goto nla_put_failure;
194 return 0;
195
196 nla_put_failure:
197 return 1;
198 }
199
200 static inline void
hash_ipmark6_data_next(struct hash_ipmark4_elem * next,const struct hash_ipmark6_elem * d)201 hash_ipmark6_data_next(struct hash_ipmark4_elem *next,
202 const struct hash_ipmark6_elem *d)
203 {
204 }
205
206 #undef MTYPE
207 #undef PF
208 #undef HOST_MASK
209 #undef HKEY_DATALEN
210
211 #define MTYPE hash_ipmark6
212 #define PF 6
213 #define HOST_MASK 128
214 #define HKEY_DATALEN sizeof(struct hash_ipmark6_elem)
215 #define IP_SET_EMIT_CREATE
216 #include "ip_set_hash_gen.h"
217
218
219 static int
hash_ipmark6_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)220 hash_ipmark6_kadt(struct ip_set *set, const struct sk_buff *skb,
221 const struct xt_action_param *par,
222 enum ipset_adt adt, struct ip_set_adt_opt *opt)
223 {
224 const struct hash_ipmark *h = set->data;
225 ipset_adtfn adtfn = set->variant->adt[adt];
226 struct hash_ipmark6_elem e = { };
227 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
228
229 e.mark = skb->mark;
230 e.mark &= h->markmask;
231
232 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
233 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
234 }
235
236 static int
hash_ipmark6_uadt(struct ip_set * set,struct nlattr * tb[],enum ipset_adt adt,u32 * lineno,u32 flags,bool retried)237 hash_ipmark6_uadt(struct ip_set *set, struct nlattr *tb[],
238 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
239 {
240 const struct hash_ipmark *h = set->data;
241 ipset_adtfn adtfn = set->variant->adt[adt];
242 struct hash_ipmark6_elem e = { };
243 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
244 int ret;
245
246 if (unlikely(!tb[IPSET_ATTR_IP] ||
247 !ip_set_attr_netorder(tb, IPSET_ATTR_MARK) ||
248 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
249 !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
250 !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
251 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) ||
252 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) ||
253 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE) ||
254 tb[IPSET_ATTR_IP_TO] ||
255 tb[IPSET_ATTR_CIDR]))
256 return -IPSET_ERR_PROTOCOL;
257
258 if (tb[IPSET_ATTR_LINENO])
259 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
260
261 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) ||
262 ip_set_get_extensions(set, tb, &ext);
263 if (ret)
264 return ret;
265
266 e.mark = ntohl(nla_get_u32(tb[IPSET_ATTR_MARK]));
267 e.mark &= h->markmask;
268
269 if (adt == IPSET_TEST) {
270 ret = adtfn(set, &e, &ext, &ext, flags);
271 return ip_set_eexist(ret, flags) ? 0 : ret;
272 }
273
274 ret = adtfn(set, &e, &ext, &ext, flags);
275 if (ret && !ip_set_eexist(ret, flags))
276 return ret;
277 else
278 ret = 0;
279
280 return ret;
281 }
282
283 static struct ip_set_type hash_ipmark_type __read_mostly = {
284 .name = "hash:ip,mark",
285 .protocol = IPSET_PROTOCOL,
286 .features = IPSET_TYPE_IP | IPSET_TYPE_MARK,
287 .dimension = IPSET_DIM_TWO,
288 .family = NFPROTO_UNSPEC,
289 .revision_min = IPSET_TYPE_REV_MIN,
290 .revision_max = IPSET_TYPE_REV_MAX,
291 .create = hash_ipmark_create,
292 .create_policy = {
293 [IPSET_ATTR_MARKMASK] = { .type = NLA_U32 },
294 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
295 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
296 [IPSET_ATTR_PROBES] = { .type = NLA_U8 },
297 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
298 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
299 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
300 },
301 .adt_policy = {
302 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
303 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
304 [IPSET_ATTR_MARK] = { .type = NLA_U32 },
305 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
306 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
307 [IPSET_ATTR_LINENO] = { .type = NLA_U32 },
308 [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
309 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
310 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING },
311 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 },
312 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 },
313 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 },
314 },
315 .me = THIS_MODULE,
316 };
317
318 static int __init
hash_ipmark_init(void)319 hash_ipmark_init(void)
320 {
321 return ip_set_type_register(&hash_ipmark_type);
322 }
323
324 static void __exit
hash_ipmark_fini(void)325 hash_ipmark_fini(void)
326 {
327 ip_set_type_unregister(&hash_ipmark_type);
328 }
329
330 module_init(hash_ipmark_init);
331 module_exit(hash_ipmark_fini);
332