1 /* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
2 * Patrick Schaaf <bof@bof.de>
3 * Martin Josefsson <gandalf@wlug.westbo.se>
4 * Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
14 #include <linux/ipv6.h>
15 #include <linux/netlink.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/x_tables.h>
18 #include <linux/stringify.h>
19 #include <linux/vmalloc.h>
20 #include <net/netlink.h>
21 #include <uapi/linux/netfilter/ipset/ip_set.h>
23 #define _IP_SET_MODULE_DESC(a, b, c) \
24 MODULE_DESCRIPTION(a " type of IP sets, revisions " b "-" c)
25 #define IP_SET_MODULE_DESC(a, b, c) \
26 _IP_SET_MODULE_DESC(a, __stringify(b), __stringify(c))
30 IPSET_TYPE_IP_FLAG = 0,
31 IPSET_TYPE_IP = (1 << IPSET_TYPE_IP_FLAG),
32 IPSET_TYPE_PORT_FLAG = 1,
33 IPSET_TYPE_PORT = (1 << IPSET_TYPE_PORT_FLAG),
34 IPSET_TYPE_MAC_FLAG = 2,
35 IPSET_TYPE_MAC = (1 << IPSET_TYPE_MAC_FLAG),
36 IPSET_TYPE_IP2_FLAG = 3,
37 IPSET_TYPE_IP2 = (1 << IPSET_TYPE_IP2_FLAG),
38 IPSET_TYPE_NAME_FLAG = 4,
39 IPSET_TYPE_NAME = (1 << IPSET_TYPE_NAME_FLAG),
40 IPSET_TYPE_IFACE_FLAG = 5,
41 IPSET_TYPE_IFACE = (1 << IPSET_TYPE_IFACE_FLAG),
42 IPSET_TYPE_NOMATCH_FLAG = 6,
43 IPSET_TYPE_NOMATCH = (1 << IPSET_TYPE_NOMATCH_FLAG),
44 /* Strictly speaking not a feature, but a flag for dumping:
45 * this settype must be dumped last */
46 IPSET_DUMP_LAST_FLAG = 7,
47 IPSET_DUMP_LAST = (1 << IPSET_DUMP_LAST_FLAG),
51 enum ip_set_extension {
53 IPSET_EXT_BIT_TIMEOUT = 1,
54 IPSET_EXT_TIMEOUT = (1 << IPSET_EXT_BIT_TIMEOUT),
55 IPSET_EXT_BIT_COUNTER = 2,
56 IPSET_EXT_COUNTER = (1 << IPSET_EXT_BIT_COUNTER),
59 #define SET_WITH_TIMEOUT(s) ((s)->extensions & IPSET_EXT_TIMEOUT)
60 #define SET_WITH_COUNTER(s) ((s)->extensions & IPSET_EXT_COUNTER)
62 /* Extension id, in size order */
64 IPSET_EXT_ID_COUNTER = 0,
70 struct ip_set_ext_type {
71 enum ip_set_extension type;
72 enum ipset_cadt_flags flag;
73 /* Size and minimal alignment */
78 extern const struct ip_set_ext_type ip_set_extensions[];
86 struct ip_set_counter {
91 #define ext_timeout(e, s) \
92 (unsigned long *)(((void *)(e)) + (s)->offset[IPSET_EXT_ID_TIMEOUT])
93 #define ext_counter(e, s) \
94 (struct ip_set_counter *)(((void *)(e)) + (s)->offset[IPSET_EXT_ID_COUNTER])
98 typedef int (*ipset_adtfn)(struct ip_set *set, void *value,
99 const struct ip_set_ext *ext,
100 struct ip_set_ext *mext, u32 cmdflags);
102 /* Kernel API function options */
103 struct ip_set_adt_opt {
104 u8 family; /* Actual protocol family */
105 u8 dim; /* Dimension of match/target */
106 u8 flags; /* Direction and negation flags */
107 u32 cmdflags; /* Command-like flags */
108 struct ip_set_ext ext; /* Extensions */
111 /* Set type, variant-specific part */
112 struct ip_set_type_variant {
113 /* Kernelspace: test/add/del entries
114 * returns negative error code,
115 * zero for no match/success to add/delete
116 * positive for matching element */
117 int (*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 /* Userspace: test/add/del entries
122 * returns negative error code,
123 * zero for no match/success to add/delete
124 * positive for matching element */
125 int (*uadt)(struct ip_set *set, struct nlattr *tb[],
126 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried);
128 /* Low level add/del/test functions */
129 ipset_adtfn adt[IPSET_ADT_MAX];
131 /* When adding entries and set is full, try to resize the set */
132 int (*resize)(struct ip_set *set, bool retried);
133 /* Destroy the set */
134 void (*destroy)(struct ip_set *set);
135 /* Flush the elements */
136 void (*flush)(struct ip_set *set);
137 /* Expire entries before listing */
138 void (*expire)(struct ip_set *set);
139 /* List set header data */
140 int (*head)(struct ip_set *set, struct sk_buff *skb);
142 int (*list)(const struct ip_set *set, struct sk_buff *skb,
143 struct netlink_callback *cb);
145 /* Return true if "b" set is the same as "a"
146 * according to the create set parameters */
147 bool (*same_set)(const struct ip_set *a, const struct ip_set *b);
150 /* The core set type structure */
152 struct list_head list;
155 char name[IPSET_MAXNAMELEN];
156 /* Protocol version */
158 /* Set features to control swapping */
160 /* Set type dimension */
163 * Supported family: may be NFPROTO_UNSPEC for both
164 * NFPROTO_IPV4/NFPROTO_IPV6.
168 u8 revision_min, revision_max;
171 int (*create)(struct ip_set *set, struct nlattr *tb[], u32 flags);
173 /* Attribute policies */
174 const struct nla_policy create_policy[IPSET_ATTR_CREATE_MAX + 1];
175 const struct nla_policy adt_policy[IPSET_ATTR_ADT_MAX + 1];
177 /* Set this to THIS_MODULE if you are a module, otherwise NULL */
181 /* register and unregister set type */
182 extern int ip_set_type_register(struct ip_set_type *set_type);
183 extern void ip_set_type_unregister(struct ip_set_type *set_type);
185 /* A generic IP set */
187 /* The name of the set */
188 char name[IPSET_MAXNAMELEN];
189 /* Lock protecting the set data */
191 /* References to the set */
193 /* The core set type */
194 struct ip_set_type *type;
195 /* The type variant doing the real job */
196 const struct ip_set_type_variant *variant;
197 /* The actual INET family of the set */
199 /* The type revision */
203 /* Default timeout value, if enabled */
205 /* Element data size */
207 /* Offsets to extensions in elements */
208 size_t offset[IPSET_EXT_ID_MAX];
209 /* The type specific data */
214 ip_set_add_bytes(u64 bytes, struct ip_set_counter *counter)
216 atomic64_add((long long)bytes, &(counter)->bytes);
220 ip_set_add_packets(u64 packets, struct ip_set_counter *counter)
222 atomic64_add((long long)packets, &(counter)->packets);
226 ip_set_get_bytes(const struct ip_set_counter *counter)
228 return (u64)atomic64_read(&(counter)->bytes);
232 ip_set_get_packets(const struct ip_set_counter *counter)
234 return (u64)atomic64_read(&(counter)->packets);
238 ip_set_update_counter(struct ip_set_counter *counter,
239 const struct ip_set_ext *ext,
240 struct ip_set_ext *mext, u32 flags)
242 if (ext->packets != ULLONG_MAX &&
243 !(flags & IPSET_FLAG_SKIP_COUNTER_UPDATE)) {
244 ip_set_add_bytes(ext->bytes, counter);
245 ip_set_add_packets(ext->packets, counter);
247 if (flags & IPSET_FLAG_MATCH_COUNTERS) {
248 mext->packets = ip_set_get_packets(counter);
249 mext->bytes = ip_set_get_bytes(counter);
254 ip_set_put_counter(struct sk_buff *skb, struct ip_set_counter *counter)
256 return nla_put_net64(skb, IPSET_ATTR_BYTES,
257 cpu_to_be64(ip_set_get_bytes(counter))) ||
258 nla_put_net64(skb, IPSET_ATTR_PACKETS,
259 cpu_to_be64(ip_set_get_packets(counter)));
263 ip_set_init_counter(struct ip_set_counter *counter,
264 const struct ip_set_ext *ext)
266 if (ext->bytes != ULLONG_MAX)
267 atomic64_set(&(counter)->bytes, (long long)(ext->bytes));
268 if (ext->packets != ULLONG_MAX)
269 atomic64_set(&(counter)->packets, (long long)(ext->packets));
272 /* register and unregister set references */
273 extern ip_set_id_t ip_set_get_byname(const char *name, struct ip_set **set);
274 extern void ip_set_put_byindex(ip_set_id_t index);
275 extern const char *ip_set_name_byindex(ip_set_id_t index);
276 extern ip_set_id_t ip_set_nfnl_get(const char *name);
277 extern ip_set_id_t ip_set_nfnl_get_byindex(ip_set_id_t index);
278 extern void ip_set_nfnl_put(ip_set_id_t index);
280 /* API for iptables set match, and SET target */
282 extern int ip_set_add(ip_set_id_t id, const struct sk_buff *skb,
283 const struct xt_action_param *par,
284 struct ip_set_adt_opt *opt);
285 extern int ip_set_del(ip_set_id_t id, const struct sk_buff *skb,
286 const struct xt_action_param *par,
287 struct ip_set_adt_opt *opt);
288 extern int ip_set_test(ip_set_id_t id, const struct sk_buff *skb,
289 const struct xt_action_param *par,
290 struct ip_set_adt_opt *opt);
292 /* Utility functions */
293 extern void *ip_set_alloc(size_t size);
294 extern void ip_set_free(void *members);
295 extern int ip_set_get_ipaddr4(struct nlattr *nla, __be32 *ipaddr);
296 extern int ip_set_get_ipaddr6(struct nlattr *nla, union nf_inet_addr *ipaddr);
297 extern size_t ip_set_elem_len(struct ip_set *set, struct nlattr *tb[],
299 extern int ip_set_get_extensions(struct ip_set *set, struct nlattr *tb[],
300 struct ip_set_ext *ext);
303 ip_set_get_hostipaddr4(struct nlattr *nla, u32 *ipaddr)
306 int ret = ip_set_get_ipaddr4(nla, &ip);
314 /* Ignore IPSET_ERR_EXIST errors if asked to do so? */
316 ip_set_eexist(int ret, u32 flags)
318 return ret == -IPSET_ERR_EXIST && (flags & IPSET_FLAG_EXIST);
321 /* Match elements marked with nomatch */
323 ip_set_enomatch(int ret, u32 flags, enum ipset_adt adt, struct ip_set *set)
325 return adt == IPSET_TEST &&
326 (set->type->features & IPSET_TYPE_NOMATCH) &&
327 ((flags >> 16) & IPSET_FLAG_NOMATCH) &&
328 (ret > 0 || ret == -ENOTEMPTY);
331 /* Check the NLA_F_NET_BYTEORDER flag */
333 ip_set_attr_netorder(struct nlattr *tb[], int type)
335 return tb[type] && (tb[type]->nla_type & NLA_F_NET_BYTEORDER);
339 ip_set_optattr_netorder(struct nlattr *tb[], int type)
341 return !tb[type] || (tb[type]->nla_type & NLA_F_NET_BYTEORDER);
344 /* Useful converters */
346 ip_set_get_h32(const struct nlattr *attr)
348 return ntohl(nla_get_be32(attr));
352 ip_set_get_h16(const struct nlattr *attr)
354 return ntohs(nla_get_be16(attr));
357 #define ipset_nest_start(skb, attr) nla_nest_start(skb, attr | NLA_F_NESTED)
358 #define ipset_nest_end(skb, start) nla_nest_end(skb, start)
360 static inline int nla_put_ipaddr4(struct sk_buff *skb, int type, __be32 ipaddr)
362 struct nlattr *__nested = ipset_nest_start(skb, type);
367 ret = nla_put_net32(skb, IPSET_ATTR_IPADDR_IPV4, ipaddr);
369 ipset_nest_end(skb, __nested);
373 static inline int nla_put_ipaddr6(struct sk_buff *skb, int type,
374 const struct in6_addr *ipaddrptr)
376 struct nlattr *__nested = ipset_nest_start(skb, type);
381 ret = nla_put(skb, IPSET_ATTR_IPADDR_IPV6,
382 sizeof(struct in6_addr), ipaddrptr);
384 ipset_nest_end(skb, __nested);
388 /* Get address from skbuff */
390 ip4addr(const struct sk_buff *skb, bool src)
392 return src ? ip_hdr(skb)->saddr : ip_hdr(skb)->daddr;
396 ip4addrptr(const struct sk_buff *skb, bool src, __be32 *addr)
398 *addr = src ? ip_hdr(skb)->saddr : ip_hdr(skb)->daddr;
402 ip6addrptr(const struct sk_buff *skb, bool src, struct in6_addr *addr)
404 memcpy(addr, src ? &ipv6_hdr(skb)->saddr : &ipv6_hdr(skb)->daddr,
408 /* Calculate the bytes required to store the inclusive range of a-b */
410 bitmap_bytes(u32 a, u32 b)
412 return 4 * ((((b - a + 8) / 8) + 3) / 4);
415 #include <linux/netfilter/ipset/ip_set_timeout.h>
417 #define IP_SET_INIT_KEXT(skb, opt, set) \
418 { .bytes = (skb)->len, .packets = 1, \
419 .timeout = ip_set_adt_opt_timeout(opt, set) }
421 #define IP_SET_INIT_UEXT(set) \
422 { .bytes = ULLONG_MAX, .packets = ULLONG_MAX, \
423 .timeout = (set)->timeout }
425 #define IP_SET_INIT_CIDR(a, b) ((a) ? (a) : (b))
427 #define IPSET_CONCAT(a, b) a##b
428 #define IPSET_TOKEN(a, b) IPSET_CONCAT(a, b)
430 #endif /*_IP_SET_H */