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,port,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_getport.h>
25 #include <linux/netfilter/ipset/ip_set_hash.h>
26
27 #define IPSET_TYPE_REV_MIN 0
28 /* 1 SCTP and UDPLITE support added */
29 /* 2 Counters support added */
30 /* 3 Comments support added */
31 /* 4 Forceadd support added */
32 #define IPSET_TYPE_REV_MAX 5 /* skbinfo support added */
33
34 MODULE_LICENSE("GPL");
35 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
36 IP_SET_MODULE_DESC("hash:ip,port,ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
37 MODULE_ALIAS("ip_set_hash:ip,port,ip");
38
39 /* Type specific function prefix */
40 #define HTYPE hash_ipportip
41
42 /* IPv4 variant */
43
44 /* Member elements */
45 struct hash_ipportip4_elem {
46 __be32 ip;
47 __be32 ip2;
48 __be16 port;
49 u8 proto;
50 u8 padding;
51 };
52
53 static inline bool
54 hash_ipportip4_data_equal(const struct hash_ipportip4_elem *ip1,
55 const struct hash_ipportip4_elem *ip2,
56 u32 *multi)
57 {
58 return ip1->ip == ip2->ip &&
59 ip1->ip2 == ip2->ip2 &&
60 ip1->port == ip2->port &&
61 ip1->proto == ip2->proto;
62 }
63
64 static bool
65 hash_ipportip4_data_list(struct sk_buff *skb,
66 const struct hash_ipportip4_elem *data)
67 {
68 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
69 nla_put_ipaddr4(skb, IPSET_ATTR_IP2, data->ip2) ||
70 nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
71 nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
72 goto nla_put_failure;
73 return false;
74
75 nla_put_failure:
76 return true;
77 }
78
79 static inline void
80 hash_ipportip4_data_next(struct hash_ipportip4_elem *next,
81 const struct hash_ipportip4_elem *d)
82 {
83 next->ip = d->ip;
84 next->port = d->port;
85 }
86
87 /* Common functions */
88 #define MTYPE hash_ipportip4
89 #define HOST_MASK 32
90 #include "ip_set_hash_gen.h"
91
92 static int
93 hash_ipportip4_kadt(struct ip_set *set, const struct sk_buff *skb,
94 const struct xt_action_param *par,
95 enum ipset_adt adt, struct ip_set_adt_opt *opt)
96 {
97 ipset_adtfn adtfn = set->variant->adt[adt];
98 struct hash_ipportip4_elem e = { .ip = 0 };
99 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
100
101 if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
102 &e.port, &e.proto))
103 return -EINVAL;
104
105 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
106 ip4addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &e.ip2);
107 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
108 }
109
110 static int
111 hash_ipportip4_uadt(struct ip_set *set, struct nlattr *tb[],
112 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
113 {
114 const struct hash_ipportip4 *h = set->data;
115 ipset_adtfn adtfn = set->variant->adt[adt];
116 struct hash_ipportip4_elem e = { .ip = 0 };
117 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
118 u32 ip, ip_to = 0, p = 0, port, port_to;
119 bool with_ports = false;
120 int ret;
121
122 if (tb[IPSET_ATTR_LINENO])
123 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
124
125 if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
126 !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
127 !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO)))
128 return -IPSET_ERR_PROTOCOL;
129
130 ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip);
131 if (ret)
132 return ret;
133
134 ret = ip_set_get_extensions(set, tb, &ext);
135 if (ret)
136 return ret;
137
138 ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP2], &e.ip2);
139 if (ret)
140 return ret;
141
142 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
143
144 if (tb[IPSET_ATTR_PROTO]) {
145 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
146 with_ports = ip_set_proto_with_ports(e.proto);
147
148 if (e.proto == 0)
149 return -IPSET_ERR_INVALID_PROTO;
150 } else {
151 return -IPSET_ERR_MISSING_PROTO;
152 }
153
154 if (!(with_ports || e.proto == IPPROTO_ICMP))
155 e.port = 0;
156
157 if (adt == IPSET_TEST ||
158 !(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR] ||
159 tb[IPSET_ATTR_PORT_TO])) {
160 ret = adtfn(set, &e, &ext, &ext, flags);
161 return ip_set_eexist(ret, flags) ? 0 : ret;
162 }
163
164 ip_to = ip = ntohl(e.ip);
165 if (tb[IPSET_ATTR_IP_TO]) {
166 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
167 if (ret)
168 return ret;
169 if (ip > ip_to)
170 swap(ip, ip_to);
171 } else if (tb[IPSET_ATTR_CIDR]) {
172 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
173
174 if (!cidr || cidr > HOST_MASK)
175 return -IPSET_ERR_INVALID_CIDR;
176 ip_set_mask_from_to(ip, ip_to, cidr);
177 }
178
179 port_to = port = ntohs(e.port);
180 if (with_ports && tb[IPSET_ATTR_PORT_TO]) {
181 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
182 if (port > port_to)
183 swap(port, port_to);
184 }
185
186 if (retried)
187 ip = ntohl(h->next.ip);
188 for (; !before(ip_to, ip); ip++) {
189 p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port)
190 : port;
191 for (; p <= port_to; p++) {
192 e.ip = htonl(ip);
193 e.port = htons(p);
194 ret = adtfn(set, &e, &ext, &ext, flags);
195
196 if (ret && !ip_set_eexist(ret, flags))
197 return ret;
198
199 ret = 0;
200 }
201 }
202 return ret;
203 }
204
205 /* IPv6 variant */
206
207 struct hash_ipportip6_elem {
208 union nf_inet_addr ip;
209 union nf_inet_addr ip2;
210 __be16 port;
211 u8 proto;
212 u8 padding;
213 };
214
215 /* Common functions */
216
217 static inline bool
218 hash_ipportip6_data_equal(const struct hash_ipportip6_elem *ip1,
219 const struct hash_ipportip6_elem *ip2,
220 u32 *multi)
221 {
222 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
223 ipv6_addr_equal(&ip1->ip2.in6, &ip2->ip2.in6) &&
224 ip1->port == ip2->port &&
225 ip1->proto == ip2->proto;
226 }
227
228 static bool
229 hash_ipportip6_data_list(struct sk_buff *skb,
230 const struct hash_ipportip6_elem *data)
231 {
232 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
233 nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip2.in6) ||
234 nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
235 nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
236 goto nla_put_failure;
237 return false;
238
239 nla_put_failure:
240 return true;
241 }
242
243 static inline void
244 hash_ipportip6_data_next(struct hash_ipportip6_elem *next,
245 const struct hash_ipportip6_elem *d)
246 {
247 next->port = d->port;
248 }
249
250 #undef MTYPE
251 #undef HOST_MASK
252
253 #define MTYPE hash_ipportip6
254 #define HOST_MASK 128
255 #define IP_SET_EMIT_CREATE
256 #include "ip_set_hash_gen.h"
257
258 static int
259 hash_ipportip6_kadt(struct ip_set *set, const struct sk_buff *skb,
260 const struct xt_action_param *par,
261 enum ipset_adt adt, struct ip_set_adt_opt *opt)
262 {
263 ipset_adtfn adtfn = set->variant->adt[adt];
264 struct hash_ipportip6_elem e = { .ip = { .all = { 0 } } };
265 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
266
267 if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
268 &e.port, &e.proto))
269 return -EINVAL;
270
271 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
272 ip6addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &e.ip2.in6);
273 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
274 }
275
276 static int
277 hash_ipportip6_uadt(struct ip_set *set, struct nlattr *tb[],
278 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
279 {
280 const struct hash_ipportip6 *h = set->data;
281 ipset_adtfn adtfn = set->variant->adt[adt];
282 struct hash_ipportip6_elem e = { .ip = { .all = { 0 } } };
283 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
284 u32 port, port_to;
285 bool with_ports = false;
286 int ret;
287
288 if (tb[IPSET_ATTR_LINENO])
289 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
290
291 if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
292 !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
293 !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO)))
294 return -IPSET_ERR_PROTOCOL;
295 if (unlikely(tb[IPSET_ATTR_IP_TO]))
296 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
297 if (unlikely(tb[IPSET_ATTR_CIDR])) {
298 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
299
300 if (cidr != HOST_MASK)
301 return -IPSET_ERR_INVALID_CIDR;
302 }
303
304 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
305 if (ret)
306 return ret;
307
308 ret = ip_set_get_extensions(set, tb, &ext);
309 if (ret)
310 return ret;
311
312 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP2], &e.ip2);
313 if (ret)
314 return ret;
315
316 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
317
318 if (tb[IPSET_ATTR_PROTO]) {
319 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
320 with_ports = ip_set_proto_with_ports(e.proto);
321
322 if (e.proto == 0)
323 return -IPSET_ERR_INVALID_PROTO;
324 } else {
325 return -IPSET_ERR_MISSING_PROTO;
326 }
327
328 if (!(with_ports || e.proto == IPPROTO_ICMPV6))
329 e.port = 0;
330
331 if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
332 ret = adtfn(set, &e, &ext, &ext, flags);
333 return ip_set_eexist(ret, flags) ? 0 : ret;
334 }
335
336 port = ntohs(e.port);
337 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
338 if (port > port_to)
339 swap(port, port_to);
340
341 if (retried)
342 port = ntohs(h->next.port);
343 for (; port <= port_to; port++) {
344 e.port = htons(port);
345 ret = adtfn(set, &e, &ext, &ext, flags);
346
347 if (ret && !ip_set_eexist(ret, flags))
348 return ret;
349
350 ret = 0;
351 }
352 return ret;
353 }
354
355 static struct ip_set_type hash_ipportip_type __read_mostly = {
356 .name = "hash:ip,port,ip",
357 .protocol = IPSET_PROTOCOL,
358 .features = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_IP2,
359 .dimension = IPSET_DIM_THREE,
360 .family = NFPROTO_UNSPEC,
361 .revision_min = IPSET_TYPE_REV_MIN,
362 .revision_max = IPSET_TYPE_REV_MAX,
363 .create = hash_ipportip_create,
364 .create_policy = {
365 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
366 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
367 [IPSET_ATTR_PROBES] = { .type = NLA_U8 },
368 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
369 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
370 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
371 },
372 .adt_policy = {
373 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
374 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
375 [IPSET_ATTR_IP2] = { .type = NLA_NESTED },
376 [IPSET_ATTR_PORT] = { .type = NLA_U16 },
377 [IPSET_ATTR_PORT_TO] = { .type = NLA_U16 },
378 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
379 [IPSET_ATTR_PROTO] = { .type = NLA_U8 },
380 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
381 [IPSET_ATTR_LINENO] = { .type = NLA_U32 },
382 [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
383 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
384 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING,
385 .len = IPSET_MAX_COMMENT_SIZE },
386 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 },
387 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 },
388 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 },
389 },
390 .me = THIS_MODULE,
391 };
392
393 static int __init
394 hash_ipportip_init(void)
395 {
396 return ip_set_type_register(&hash_ipportip_type);
397 }
398
399 static void __exit
400 hash_ipportip_fini(void)
401 {
402 rcu_barrier();
403 ip_set_type_unregister(&hash_ipportip_type);
404 }
405
406 module_init(hash_ipportip_init);
407 module_exit(hash_ipportip_fini);
408
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