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3b02b56c VD |
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 | |
af331419 AD |
28 | /* 1 Forceadd support */ |
29 | #define IPSET_TYPE_REV_MAX 2 /* skbinfo support */ | |
3b02b56c VD |
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 | |
4d0e5c07 | 38 | #define IP_SET_HASH_WITH_MARKMASK |
3b02b56c VD |
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 | |
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 | |
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; | |
728a7e69 | 66 | return false; |
3b02b56c VD |
67 | |
68 | nla_put_failure: | |
728a7e69 | 69 | return true; |
3b02b56c VD |
70 | } |
71 | ||
72 | static inline void | |
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 | ||
1823fb79 SP |
79 | #define MTYPE hash_ipmark4 |
80 | #define HOST_MASK 32 | |
3b02b56c VD |
81 | #include "ip_set_hash_gen.h" |
82 | ||
83 | static int | |
84 | hash_ipmark4_kadt(struct ip_set *set, const struct sk_buff *skb, | |
85 | const struct xt_action_param *par, | |
86 | enum ipset_adt adt, struct ip_set_adt_opt *opt) | |
87 | { | |
4d0e5c07 | 88 | const struct hash_ipmark *h = set->data; |
3b02b56c VD |
89 | ipset_adtfn adtfn = set->variant->adt[adt]; |
90 | struct hash_ipmark4_elem e = { }; | |
91 | struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); | |
92 | ||
93 | e.mark = skb->mark; | |
4d0e5c07 | 94 | e.mark &= h->markmask; |
3b02b56c VD |
95 | |
96 | ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip); | |
97 | return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); | |
98 | } | |
99 | ||
100 | static int | |
101 | hash_ipmark4_uadt(struct ip_set *set, struct nlattr *tb[], | |
102 | enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) | |
103 | { | |
104 | const struct hash_ipmark *h = set->data; | |
105 | ipset_adtfn adtfn = set->variant->adt[adt]; | |
106 | struct hash_ipmark4_elem e = { }; | |
107 | struct ip_set_ext ext = IP_SET_INIT_UEXT(set); | |
108 | u32 ip, ip_to = 0; | |
109 | int ret; | |
110 | ||
a212e08e SP |
111 | if (tb[IPSET_ATTR_LINENO]) |
112 | *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); | |
113 | ||
3b02b56c | 114 | if (unlikely(!tb[IPSET_ATTR_IP] || |
7dd37bc8 | 115 | !ip_set_attr_netorder(tb, IPSET_ATTR_MARK))) |
3b02b56c VD |
116 | return -IPSET_ERR_PROTOCOL; |
117 | ||
8e55d2e5 SP |
118 | ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip); |
119 | if (ret) | |
120 | return ret; | |
121 | ||
122 | ret = ip_set_get_extensions(set, tb, &ext); | |
3b02b56c VD |
123 | if (ret) |
124 | return ret; | |
125 | ||
2006aa4a | 126 | e.mark = ntohl(nla_get_be32(tb[IPSET_ATTR_MARK])); |
4d0e5c07 | 127 | e.mark &= h->markmask; |
3b02b56c VD |
128 | |
129 | if (adt == IPSET_TEST || | |
130 | !(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR])) { | |
131 | ret = adtfn(set, &e, &ext, &ext, flags); | |
132 | return ip_set_eexist(ret, flags) ? 0 : ret; | |
133 | } | |
134 | ||
135 | ip_to = ip = ntohl(e.ip); | |
136 | if (tb[IPSET_ATTR_IP_TO]) { | |
137 | ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to); | |
138 | if (ret) | |
139 | return ret; | |
140 | if (ip > ip_to) | |
141 | swap(ip, ip_to); | |
142 | } else if (tb[IPSET_ATTR_CIDR]) { | |
143 | u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); | |
144 | ||
cabfd139 | 145 | if (!cidr || cidr > HOST_MASK) |
3b02b56c VD |
146 | return -IPSET_ERR_INVALID_CIDR; |
147 | ip_set_mask_from_to(ip, ip_to, cidr); | |
148 | } | |
149 | ||
150 | if (retried) | |
151 | ip = ntohl(h->next.ip); | |
152 | for (; !before(ip_to, ip); ip++) { | |
153 | e.ip = htonl(ip); | |
154 | ret = adtfn(set, &e, &ext, &ext, flags); | |
155 | ||
156 | if (ret && !ip_set_eexist(ret, flags)) | |
157 | return ret; | |
ca0f6a5c JK |
158 | |
159 | ret = 0; | |
3b02b56c VD |
160 | } |
161 | return ret; | |
162 | } | |
163 | ||
164 | /* IPv6 variant */ | |
165 | ||
166 | struct hash_ipmark6_elem { | |
167 | union nf_inet_addr ip; | |
168 | __u32 mark; | |
169 | }; | |
170 | ||
171 | /* Common functions */ | |
172 | ||
173 | static inline bool | |
174 | hash_ipmark6_data_equal(const struct hash_ipmark6_elem *ip1, | |
175 | const struct hash_ipmark6_elem *ip2, | |
176 | u32 *multi) | |
177 | { | |
178 | return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) && | |
179 | ip1->mark == ip2->mark; | |
180 | } | |
181 | ||
182 | static bool | |
183 | hash_ipmark6_data_list(struct sk_buff *skb, | |
184 | const struct hash_ipmark6_elem *data) | |
185 | { | |
186 | if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) || | |
187 | nla_put_net32(skb, IPSET_ATTR_MARK, htonl(data->mark))) | |
188 | goto nla_put_failure; | |
728a7e69 | 189 | return false; |
3b02b56c VD |
190 | |
191 | nla_put_failure: | |
728a7e69 | 192 | return true; |
3b02b56c VD |
193 | } |
194 | ||
195 | static inline void | |
196 | hash_ipmark6_data_next(struct hash_ipmark4_elem *next, | |
197 | const struct hash_ipmark6_elem *d) | |
198 | { | |
199 | } | |
200 | ||
201 | #undef MTYPE | |
3b02b56c | 202 | #undef HOST_MASK |
3b02b56c VD |
203 | |
204 | #define MTYPE hash_ipmark6 | |
3b02b56c | 205 | #define HOST_MASK 128 |
1823fb79 | 206 | #define IP_SET_EMIT_CREATE |
3b02b56c VD |
207 | #include "ip_set_hash_gen.h" |
208 | ||
3b02b56c VD |
209 | static int |
210 | hash_ipmark6_kadt(struct ip_set *set, const struct sk_buff *skb, | |
211 | const struct xt_action_param *par, | |
212 | enum ipset_adt adt, struct ip_set_adt_opt *opt) | |
213 | { | |
4d0e5c07 | 214 | const struct hash_ipmark *h = set->data; |
3b02b56c VD |
215 | ipset_adtfn adtfn = set->variant->adt[adt]; |
216 | struct hash_ipmark6_elem e = { }; | |
217 | struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); | |
218 | ||
219 | e.mark = skb->mark; | |
4d0e5c07 | 220 | e.mark &= h->markmask; |
3b02b56c VD |
221 | |
222 | ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6); | |
223 | return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); | |
224 | } | |
225 | ||
226 | static int | |
227 | hash_ipmark6_uadt(struct ip_set *set, struct nlattr *tb[], | |
228 | enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) | |
229 | { | |
4d0e5c07 | 230 | const struct hash_ipmark *h = set->data; |
3b02b56c VD |
231 | ipset_adtfn adtfn = set->variant->adt[adt]; |
232 | struct hash_ipmark6_elem e = { }; | |
233 | struct ip_set_ext ext = IP_SET_INIT_UEXT(set); | |
234 | int ret; | |
235 | ||
a212e08e SP |
236 | if (tb[IPSET_ATTR_LINENO]) |
237 | *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); | |
238 | ||
3b02b56c | 239 | if (unlikely(!tb[IPSET_ATTR_IP] || |
2c227f27 | 240 | !ip_set_attr_netorder(tb, IPSET_ATTR_MARK))) |
3b02b56c | 241 | return -IPSET_ERR_PROTOCOL; |
2c227f27 SP |
242 | if (unlikely(tb[IPSET_ATTR_IP_TO])) |
243 | return -IPSET_ERR_HASH_RANGE_UNSUPPORTED; | |
244 | if (unlikely(tb[IPSET_ATTR_CIDR])) { | |
245 | u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); | |
246 | ||
247 | if (cidr != HOST_MASK) | |
248 | return -IPSET_ERR_INVALID_CIDR; | |
249 | } | |
3b02b56c | 250 | |
8e55d2e5 SP |
251 | ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip); |
252 | if (ret) | |
253 | return ret; | |
254 | ||
255 | ret = ip_set_get_extensions(set, tb, &ext); | |
3b02b56c VD |
256 | if (ret) |
257 | return ret; | |
258 | ||
2006aa4a | 259 | e.mark = ntohl(nla_get_be32(tb[IPSET_ATTR_MARK])); |
4d0e5c07 | 260 | e.mark &= h->markmask; |
3b02b56c VD |
261 | |
262 | if (adt == IPSET_TEST) { | |
263 | ret = adtfn(set, &e, &ext, &ext, flags); | |
264 | return ip_set_eexist(ret, flags) ? 0 : ret; | |
265 | } | |
266 | ||
267 | ret = adtfn(set, &e, &ext, &ext, flags); | |
268 | if (ret && !ip_set_eexist(ret, flags)) | |
269 | return ret; | |
3b02b56c | 270 | |
ca0f6a5c | 271 | return 0; |
3b02b56c VD |
272 | } |
273 | ||
274 | static struct ip_set_type hash_ipmark_type __read_mostly = { | |
275 | .name = "hash:ip,mark", | |
276 | .protocol = IPSET_PROTOCOL, | |
277 | .features = IPSET_TYPE_IP | IPSET_TYPE_MARK, | |
278 | .dimension = IPSET_DIM_TWO, | |
279 | .family = NFPROTO_UNSPEC, | |
280 | .revision_min = IPSET_TYPE_REV_MIN, | |
281 | .revision_max = IPSET_TYPE_REV_MAX, | |
282 | .create = hash_ipmark_create, | |
283 | .create_policy = { | |
4d0e5c07 | 284 | [IPSET_ATTR_MARKMASK] = { .type = NLA_U32 }, |
3b02b56c VD |
285 | [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, |
286 | [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, | |
287 | [IPSET_ATTR_PROBES] = { .type = NLA_U8 }, | |
288 | [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, | |
289 | [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, | |
290 | [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, | |
291 | }, | |
292 | .adt_policy = { | |
293 | [IPSET_ATTR_IP] = { .type = NLA_NESTED }, | |
294 | [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, | |
295 | [IPSET_ATTR_MARK] = { .type = NLA_U32 }, | |
296 | [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, | |
297 | [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, | |
298 | [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, | |
299 | [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, | |
300 | [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, | |
03726186 SP |
301 | [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING, |
302 | .len = IPSET_MAX_COMMENT_SIZE }, | |
af331419 AD |
303 | [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, |
304 | [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, | |
305 | [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, | |
3b02b56c VD |
306 | }, |
307 | .me = THIS_MODULE, | |
308 | }; | |
309 | ||
310 | static int __init | |
311 | hash_ipmark_init(void) | |
312 | { | |
313 | return ip_set_type_register(&hash_ipmark_type); | |
314 | } | |
315 | ||
316 | static void __exit | |
317 | hash_ipmark_fini(void) | |
318 | { | |
18f84d41 | 319 | rcu_barrier(); |
3b02b56c VD |
320 | ip_set_type_unregister(&hash_ipmark_type); |
321 | } | |
322 | ||
323 | module_init(hash_ipmark_init); | |
324 | module_exit(hash_ipmark_fini); |