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) 2003-2011 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),
52 typedef int (*ipset_adtfn)(struct ip_set *set, void *value,
53 u32 timeout, u32 flags);
55 /* Kernel API function options */
56 struct ip_set_adt_opt {
57 u8 family; /* Actual protocol family */
58 u8 dim; /* Dimension of match/target */
59 u8 flags; /* Direction and negation flags */
60 u32 cmdflags; /* Command-like flags */
61 u32 timeout; /* Timeout value */
64 /* Set type, variant-specific part */
65 struct ip_set_type_variant {
66 /* Kernelspace: test/add/del entries
67 * returns negative error code,
68 * zero for no match/success to add/delete
69 * positive for matching element */
70 int (*kadt)(struct ip_set *set, const struct sk_buff *skb,
71 const struct xt_action_param *par,
72 enum ipset_adt adt, const struct ip_set_adt_opt *opt);
74 /* Userspace: test/add/del entries
75 * returns negative error code,
76 * zero for no match/success to add/delete
77 * positive for matching element */
78 int (*uadt)(struct ip_set *set, struct nlattr *tb[],
79 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried);
81 /* Low level add/del/test functions */
82 ipset_adtfn adt[IPSET_ADT_MAX];
84 /* When adding entries and set is full, try to resize the set */
85 int (*resize)(struct ip_set *set, bool retried);
87 void (*destroy)(struct ip_set *set);
88 /* Flush the elements */
89 void (*flush)(struct ip_set *set);
90 /* Expire entries before listing */
91 void (*expire)(struct ip_set *set);
92 /* List set header data */
93 int (*head)(struct ip_set *set, struct sk_buff *skb);
95 int (*list)(const struct ip_set *set, struct sk_buff *skb,
96 struct netlink_callback *cb);
98 /* Return true if "b" set is the same as "a"
99 * according to the create set parameters */
100 bool (*same_set)(const struct ip_set *a, const struct ip_set *b);
103 /* The core set type structure */
105 struct list_head list;
108 char name[IPSET_MAXNAMELEN];
109 /* Protocol version */
111 /* Set features to control swapping */
113 /* Set type dimension */
116 * Supported family: may be NFPROTO_UNSPEC for both
117 * NFPROTO_IPV4/NFPROTO_IPV6.
121 u8 revision_min, revision_max;
124 int (*create)(struct ip_set *set, struct nlattr *tb[], u32 flags);
126 /* Attribute policies */
127 const struct nla_policy create_policy[IPSET_ATTR_CREATE_MAX + 1];
128 const struct nla_policy adt_policy[IPSET_ATTR_ADT_MAX + 1];
130 /* Set this to THIS_MODULE if you are a module, otherwise NULL */
134 /* register and unregister set type */
135 extern int ip_set_type_register(struct ip_set_type *set_type);
136 extern void ip_set_type_unregister(struct ip_set_type *set_type);
138 /* A generic IP set */
140 /* The name of the set */
141 char name[IPSET_MAXNAMELEN];
142 /* Lock protecting the set data */
144 /* References to the set */
146 /* The core set type */
147 struct ip_set_type *type;
148 /* The type variant doing the real job */
149 const struct ip_set_type_variant *variant;
150 /* The actual INET family of the set */
152 /* The type revision */
154 /* The type specific data */
158 /* register and unregister set references */
159 extern ip_set_id_t ip_set_get_byname(const char *name, struct ip_set **set);
160 extern void ip_set_put_byindex(ip_set_id_t index);
161 extern const char *ip_set_name_byindex(ip_set_id_t index);
162 extern ip_set_id_t ip_set_nfnl_get(const char *name);
163 extern ip_set_id_t ip_set_nfnl_get_byindex(ip_set_id_t index);
164 extern void ip_set_nfnl_put(ip_set_id_t index);
166 /* API for iptables set match, and SET target */
168 extern int ip_set_add(ip_set_id_t id, const struct sk_buff *skb,
169 const struct xt_action_param *par,
170 const struct ip_set_adt_opt *opt);
171 extern int ip_set_del(ip_set_id_t id, const struct sk_buff *skb,
172 const struct xt_action_param *par,
173 const struct ip_set_adt_opt *opt);
174 extern int ip_set_test(ip_set_id_t id, const struct sk_buff *skb,
175 const struct xt_action_param *par,
176 const struct ip_set_adt_opt *opt);
178 /* Utility functions */
179 extern void *ip_set_alloc(size_t size);
180 extern void ip_set_free(void *members);
181 extern int ip_set_get_ipaddr4(struct nlattr *nla, __be32 *ipaddr);
182 extern int ip_set_get_ipaddr6(struct nlattr *nla, union nf_inet_addr *ipaddr);
185 ip_set_get_hostipaddr4(struct nlattr *nla, u32 *ipaddr)
188 int ret = ip_set_get_ipaddr4(nla, &ip);
196 /* Ignore IPSET_ERR_EXIST errors if asked to do so? */
198 ip_set_eexist(int ret, u32 flags)
200 return ret == -IPSET_ERR_EXIST && (flags & IPSET_FLAG_EXIST);
203 /* Check the NLA_F_NET_BYTEORDER flag */
205 ip_set_attr_netorder(struct nlattr *tb[], int type)
207 return tb[type] && (tb[type]->nla_type & NLA_F_NET_BYTEORDER);
211 ip_set_optattr_netorder(struct nlattr *tb[], int type)
213 return !tb[type] || (tb[type]->nla_type & NLA_F_NET_BYTEORDER);
216 /* Useful converters */
218 ip_set_get_h32(const struct nlattr *attr)
220 return ntohl(nla_get_be32(attr));
224 ip_set_get_h16(const struct nlattr *attr)
226 return ntohs(nla_get_be16(attr));
229 #define ipset_nest_start(skb, attr) nla_nest_start(skb, attr | NLA_F_NESTED)
230 #define ipset_nest_end(skb, start) nla_nest_end(skb, start)
232 static inline int nla_put_ipaddr4(struct sk_buff *skb, int type, __be32 ipaddr)
234 struct nlattr *__nested = ipset_nest_start(skb, type);
239 ret = nla_put_net32(skb, IPSET_ATTR_IPADDR_IPV4, ipaddr);
241 ipset_nest_end(skb, __nested);
245 static inline int nla_put_ipaddr6(struct sk_buff *skb, int type,
246 const struct in6_addr *ipaddrptr)
248 struct nlattr *__nested = ipset_nest_start(skb, type);
253 ret = nla_put(skb, IPSET_ATTR_IPADDR_IPV6,
254 sizeof(struct in6_addr), ipaddrptr);
256 ipset_nest_end(skb, __nested);
260 /* Get address from skbuff */
262 ip4addr(const struct sk_buff *skb, bool src)
264 return src ? ip_hdr(skb)->saddr : ip_hdr(skb)->daddr;
268 ip4addrptr(const struct sk_buff *skb, bool src, __be32 *addr)
270 *addr = src ? ip_hdr(skb)->saddr : ip_hdr(skb)->daddr;
274 ip6addrptr(const struct sk_buff *skb, bool src, struct in6_addr *addr)
276 memcpy(addr, src ? &ipv6_hdr(skb)->saddr : &ipv6_hdr(skb)->daddr,
280 /* Calculate the bytes required to store the inclusive range of a-b */
282 bitmap_bytes(u32 a, u32 b)
284 return 4 * ((((b - a + 8) / 8) + 3) / 4);
287 #endif /*_IP_SET_H */