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
113 #include "ip_set_hash_gen.h"
116 hash_net4_kadt(struct ip_set *set, const struct sk_buff *skb,
117 const struct xt_action_param *par,
118 enum ipset_adt adt, struct ip_set_adt_opt *opt)
120 const struct hash_net4 *h = set->data;
121 ipset_adtfn adtfn = set->variant->adt[adt];
122 struct hash_net4_elem e = {
123 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
125 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
129 if (adt == IPSET_TEST)
132 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
133 e.ip &= ip_set_netmask(e.cidr);
135 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
139 hash_net4_uadt(struct ip_set *set, struct nlattr *tb[],
140 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
142 const struct hash_net4 *h = set->data;
143 ipset_adtfn adtfn = set->variant->adt[adt];
144 struct hash_net4_elem e = { .cidr = HOST_MASK };
145 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
146 u32 ip = 0, ip_to = 0;
149 if (tb[IPSET_ATTR_LINENO])
150 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
152 if (unlikely(!tb[IPSET_ATTR_IP] ||
153 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
154 return -IPSET_ERR_PROTOCOL;
156 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
160 ret = ip_set_get_extensions(set, tb, &ext);
164 if (tb[IPSET_ATTR_CIDR]) {
165 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
166 if (!e.cidr || e.cidr > HOST_MASK)
167 return -IPSET_ERR_INVALID_CIDR;
170 if (tb[IPSET_ATTR_CADT_FLAGS]) {
171 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
173 if (cadt_flags & IPSET_FLAG_NOMATCH)
174 flags |= (IPSET_FLAG_NOMATCH << 16);
177 if (adt == IPSET_TEST || !tb[IPSET_ATTR_IP_TO]) {
178 e.ip = htonl(ip & ip_set_hostmask(e.cidr));
179 ret = adtfn(set, &e, &ext, &ext, flags);
180 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
181 ip_set_eexist(ret, flags) ? 0 : ret;
185 if (tb[IPSET_ATTR_IP_TO]) {
186 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
191 if (ip + UINT_MAX == ip_to)
192 return -IPSET_ERR_HASH_RANGE;
195 ip = ntohl(h->next.ip);
198 ip = ip_set_range_to_cidr(ip, ip_to, &e.cidr);
199 ret = adtfn(set, &e, &ext, &ext, flags);
200 if (ret && !ip_set_eexist(ret, flags))
204 } while (ip++ < ip_to);
210 struct hash_net6_elem {
211 union nf_inet_addr ip;
217 /* Common functions */
220 hash_net6_data_equal(const struct hash_net6_elem *ip1,
221 const struct hash_net6_elem *ip2,
224 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
225 ip1->cidr == ip2->cidr;
229 hash_net6_do_data_match(const struct hash_net6_elem *elem)
231 return elem->nomatch ? -ENOTEMPTY : 1;
235 hash_net6_data_set_flags(struct hash_net6_elem *elem, u32 flags)
237 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
241 hash_net6_data_reset_flags(struct hash_net6_elem *elem, u8 *flags)
243 swap(*flags, elem->nomatch);
247 hash_net6_data_netmask(struct hash_net6_elem *elem, u8 cidr)
249 ip6_netmask(&elem->ip, cidr);
254 hash_net6_data_list(struct sk_buff *skb, const struct hash_net6_elem *data)
256 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
258 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
259 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
261 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
262 goto nla_put_failure;
270 hash_net6_data_next(struct hash_net6_elem *next,
271 const struct hash_net6_elem *d)
278 #define MTYPE hash_net6
279 #define HOST_MASK 128
280 #define IP_SET_EMIT_CREATE
281 #include "ip_set_hash_gen.h"
284 hash_net6_kadt(struct ip_set *set, const struct sk_buff *skb,
285 const struct xt_action_param *par,
286 enum ipset_adt adt, struct ip_set_adt_opt *opt)
288 const struct hash_net6 *h = set->data;
289 ipset_adtfn adtfn = set->variant->adt[adt];
290 struct hash_net6_elem e = {
291 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
293 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
297 if (adt == IPSET_TEST)
300 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
301 ip6_netmask(&e.ip, e.cidr);
303 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
307 hash_net6_uadt(struct ip_set *set, struct nlattr *tb[],
308 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
310 ipset_adtfn adtfn = set->variant->adt[adt];
311 struct hash_net6_elem e = { .cidr = HOST_MASK };
312 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
315 if (tb[IPSET_ATTR_LINENO])
316 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
318 if (unlikely(!tb[IPSET_ATTR_IP] ||
319 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
320 return -IPSET_ERR_PROTOCOL;
321 if (unlikely(tb[IPSET_ATTR_IP_TO]))
322 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
324 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
328 ret = ip_set_get_extensions(set, tb, &ext);
332 if (tb[IPSET_ATTR_CIDR]) {
333 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
334 if (!e.cidr || e.cidr > HOST_MASK)
335 return -IPSET_ERR_INVALID_CIDR;
338 ip6_netmask(&e.ip, e.cidr);
340 if (tb[IPSET_ATTR_CADT_FLAGS]) {
341 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
343 if (cadt_flags & IPSET_FLAG_NOMATCH)
344 flags |= (IPSET_FLAG_NOMATCH << 16);
347 ret = adtfn(set, &e, &ext, &ext, flags);
349 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
350 ip_set_eexist(ret, flags) ? 0 : ret;
353 static struct ip_set_type hash_net_type __read_mostly = {
355 .protocol = IPSET_PROTOCOL,
356 .features = IPSET_TYPE_IP | IPSET_TYPE_NOMATCH,
357 .dimension = IPSET_DIM_ONE,
358 .family = NFPROTO_UNSPEC,
359 .revision_min = IPSET_TYPE_REV_MIN,
360 .revision_max = IPSET_TYPE_REV_MAX,
361 .create = hash_net_create,
363 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
364 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
365 [IPSET_ATTR_PROBES] = { .type = NLA_U8 },
366 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
367 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
368 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
371 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
372 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
373 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
374 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
375 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
376 [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
377 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
378 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING,
379 .len = IPSET_MAX_COMMENT_SIZE },
380 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 },
381 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 },
382 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 },
390 return ip_set_type_register(&hash_net_type);
397 ip_set_type_unregister(&hash_net_type);
400 module_init(hash_net_init);
401 module_exit(hash_net_fini);