1 /* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
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.
8 /* Kernel module implementing an IP set type: the hash:net type */
10 #include <linux/jhash.h>
11 #include <linux/module.h>
13 #include <linux/skbuff.h>
14 #include <linux/errno.h>
15 #include <linux/random.h>
18 #include <net/netlink.h>
20 #include <linux/netfilter.h>
21 #include <linux/netfilter/ipset/pfxlen.h>
22 #include <linux/netfilter/ipset/ip_set.h>
23 #include <linux/netfilter/ipset/ip_set_hash.h>
25 #define IPSET_TYPE_REV_MIN 0
26 /* 1 Range as input support for IPv4 added */
27 /* 2 nomatch flag support added */
28 /* 3 Counters support added */
29 /* 4 Comments support added */
30 /* 5 Forceadd support added */
31 #define IPSET_TYPE_REV_MAX 6 /* skbinfo mapping support added */
33 MODULE_LICENSE("GPL");
34 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
35 IP_SET_MODULE_DESC("hash:net", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
36 MODULE_ALIAS("ip_set_hash:net");
38 /* Type specific function prefix */
39 #define HTYPE hash_net
40 #define IP_SET_HASH_WITH_NETS
45 struct hash_net4_elem {
52 /* Common functions */
55 hash_net4_data_equal(const struct hash_net4_elem *ip1,
56 const struct hash_net4_elem *ip2,
59 return ip1->ip == ip2->ip &&
60 ip1->cidr == ip2->cidr;
64 hash_net4_do_data_match(const struct hash_net4_elem *elem)
66 return elem->nomatch ? -ENOTEMPTY : 1;
70 hash_net4_data_set_flags(struct hash_net4_elem *elem, u32 flags)
72 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
76 hash_net4_data_reset_flags(struct hash_net4_elem *elem, u8 *flags)
78 swap(*flags, elem->nomatch);
82 hash_net4_data_netmask(struct hash_net4_elem *elem, u8 cidr)
84 elem->ip &= ip_set_netmask(cidr);
89 hash_net4_data_list(struct sk_buff *skb, const struct hash_net4_elem *data)
91 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
93 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
94 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
96 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
105 hash_net4_data_next(struct hash_net4_elem *next,
106 const struct hash_net4_elem *d)
111 #define MTYPE hash_net4
114 #include "ip_set_hash_gen.h"
117 hash_net4_kadt(struct ip_set *set, const struct sk_buff *skb,
118 const struct xt_action_param *par,
119 enum ipset_adt adt, struct ip_set_adt_opt *opt)
121 const struct hash_net *h = set->data;
122 ipset_adtfn adtfn = set->variant->adt[adt];
123 struct hash_net4_elem e = {
124 .cidr = IP_SET_INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
126 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
130 if (adt == IPSET_TEST)
133 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
134 e.ip &= ip_set_netmask(e.cidr);
136 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
140 hash_net4_uadt(struct ip_set *set, struct nlattr *tb[],
141 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
143 const struct hash_net *h = set->data;
144 ipset_adtfn adtfn = set->variant->adt[adt];
145 struct hash_net4_elem e = { .cidr = HOST_MASK };
146 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
147 u32 ip = 0, ip_to = 0, last;
150 if (unlikely(!tb[IPSET_ATTR_IP] ||
151 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
152 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS) ||
153 !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
154 !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
155 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) ||
156 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) ||
157 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE)))
158 return -IPSET_ERR_PROTOCOL;
160 if (tb[IPSET_ATTR_LINENO])
161 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
163 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip) ||
164 ip_set_get_extensions(set, tb, &ext);
168 if (tb[IPSET_ATTR_CIDR]) {
169 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
170 if (!e.cidr || e.cidr > HOST_MASK)
171 return -IPSET_ERR_INVALID_CIDR;
174 if (tb[IPSET_ATTR_CADT_FLAGS]) {
175 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
176 if (cadt_flags & IPSET_FLAG_NOMATCH)
177 flags |= (IPSET_FLAG_NOMATCH << 16);
180 if (adt == IPSET_TEST || !tb[IPSET_ATTR_IP_TO]) {
181 e.ip = htonl(ip & ip_set_hostmask(e.cidr));
182 ret = adtfn(set, &e, &ext, &ext, flags);
183 return ip_set_enomatch(ret, flags, adt, set) ? -ret:
184 ip_set_eexist(ret, flags) ? 0 : ret;
188 if (tb[IPSET_ATTR_IP_TO]) {
189 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
194 if (ip + UINT_MAX == ip_to)
195 return -IPSET_ERR_HASH_RANGE;
198 ip = ntohl(h->next.ip);
199 while (!after(ip, ip_to)) {
201 last = ip_set_range_to_cidr(ip, ip_to, &e.cidr);
202 ret = adtfn(set, &e, &ext, &ext, flags);
203 if (ret && !ip_set_eexist(ret, flags))
214 struct hash_net6_elem {
215 union nf_inet_addr ip;
221 /* Common functions */
224 hash_net6_data_equal(const struct hash_net6_elem *ip1,
225 const struct hash_net6_elem *ip2,
228 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
229 ip1->cidr == ip2->cidr;
233 hash_net6_do_data_match(const struct hash_net6_elem *elem)
235 return elem->nomatch ? -ENOTEMPTY : 1;
239 hash_net6_data_set_flags(struct hash_net6_elem *elem, u32 flags)
241 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
245 hash_net6_data_reset_flags(struct hash_net6_elem *elem, u8 *flags)
247 swap(*flags, elem->nomatch);
251 hash_net6_data_netmask(struct hash_net6_elem *elem, u8 cidr)
253 ip6_netmask(&elem->ip, cidr);
258 hash_net6_data_list(struct sk_buff *skb, const struct hash_net6_elem *data)
260 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
262 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
263 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
265 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
266 goto nla_put_failure;
274 hash_net6_data_next(struct hash_net4_elem *next,
275 const struct hash_net6_elem *d)
283 #define MTYPE hash_net6
285 #define HOST_MASK 128
286 #define IP_SET_EMIT_CREATE
287 #include "ip_set_hash_gen.h"
290 hash_net6_kadt(struct ip_set *set, const struct sk_buff *skb,
291 const struct xt_action_param *par,
292 enum ipset_adt adt, struct ip_set_adt_opt *opt)
294 const struct hash_net *h = set->data;
295 ipset_adtfn adtfn = set->variant->adt[adt];
296 struct hash_net6_elem e = {
297 .cidr = IP_SET_INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
299 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
303 if (adt == IPSET_TEST)
306 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
307 ip6_netmask(&e.ip, e.cidr);
309 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
313 hash_net6_uadt(struct ip_set *set, struct nlattr *tb[],
314 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
316 ipset_adtfn adtfn = set->variant->adt[adt];
317 struct hash_net6_elem e = { .cidr = HOST_MASK };
318 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
321 if (unlikely(!tb[IPSET_ATTR_IP] ||
322 !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
323 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS) ||
324 !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
325 !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
326 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) ||
327 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) ||
328 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE)))
329 return -IPSET_ERR_PROTOCOL;
330 if (unlikely(tb[IPSET_ATTR_IP_TO]))
331 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
333 if (tb[IPSET_ATTR_LINENO])
334 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
336 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) ||
337 ip_set_get_extensions(set, tb, &ext);
341 if (tb[IPSET_ATTR_CIDR])
342 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
344 if (!e.cidr || e.cidr > HOST_MASK)
345 return -IPSET_ERR_INVALID_CIDR;
347 ip6_netmask(&e.ip, e.cidr);
349 if (tb[IPSET_ATTR_CADT_FLAGS]) {
350 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
351 if (cadt_flags & IPSET_FLAG_NOMATCH)
352 flags |= (IPSET_FLAG_NOMATCH << 16);
355 ret = adtfn(set, &e, &ext, &ext, flags);
357 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
358 ip_set_eexist(ret, flags) ? 0 : ret;
361 static struct ip_set_type hash_net_type __read_mostly = {
363 .protocol = IPSET_PROTOCOL,
364 .features = IPSET_TYPE_IP | IPSET_TYPE_NOMATCH,
365 .dimension = IPSET_DIM_ONE,
366 .family = NFPROTO_UNSPEC,
367 .revision_min = IPSET_TYPE_REV_MIN,
368 .revision_max = IPSET_TYPE_REV_MAX,
369 .create = hash_net_create,
371 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
372 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
373 [IPSET_ATTR_PROBES] = { .type = NLA_U8 },
374 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
375 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
376 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
379 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
380 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
381 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
382 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
383 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
384 [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
385 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
386 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING },
387 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 },
388 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 },
389 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 },
397 return ip_set_type_register(&hash_net_type);
403 ip_set_type_unregister(&hash_net_type);
406 module_init(hash_net_init);
407 module_exit(hash_net_fini);