1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * 25-Jul-1998 Major changes to allow for ip chain table
4 *
5 * 3-Jan-2000 Named tables to allow packet selection for different uses.
6 */
7
8 /*
9 * Format of an IP6 firewall descriptor
10 *
11 * src, dst, src_mask, dst_mask are always stored in network byte order.
12 * flags are stored in host byte order (of course).
13 * Port numbers are stored in HOST byte order.
14 */
15 #ifndef _IP6_TABLES_H
16 #define _IP6_TABLES_H
17
18 #include <linux/if.h>
19 #include <linux/in6.h>
20 #include <linux/ipv6.h>
21 #include <linux/skbuff.h>
22
23 #include <linux/init.h>
24 #include <uapi/linux/netfilter_ipv6/ip6_tables.h>
25
26 extern void ip6t_init(void) __init;
27
28 extern void *ip6t_alloc_initial_table(const struct xt_table *);
29 int ip6t_register_table(struct net *net, const struct xt_table *table,
30 const struct ip6t_replace *repl,
31 const struct nf_hook_ops *ops, struct xt_table **res);
32 void ip6t_unregister_table(struct net *net, struct xt_table *table,
33 const struct nf_hook_ops *ops);
34 extern unsigned int ip6t_do_table(struct sk_buff *skb,
35 const struct nf_hook_state *state,
36 struct xt_table *table);
37
38 /* Check for an extension */
39 static inline int
ip6t_ext_hdr(u8 nexthdr)40 ip6t_ext_hdr(u8 nexthdr)
41 { return (nexthdr == IPPROTO_HOPOPTS) ||
42 (nexthdr == IPPROTO_ROUTING) ||
43 (nexthdr == IPPROTO_FRAGMENT) ||
44 (nexthdr == IPPROTO_ESP) ||
45 (nexthdr == IPPROTO_AH) ||
46 (nexthdr == IPPROTO_NONE) ||
47 (nexthdr == IPPROTO_DSTOPTS);
48 }
49
50 #ifdef CONFIG_COMPAT
51 #include <net/compat.h>
52
53 struct compat_ip6t_entry {
54 struct ip6t_ip6 ipv6;
55 compat_uint_t nfcache;
56 __u16 target_offset;
57 __u16 next_offset;
58 compat_uint_t comefrom;
59 struct compat_xt_counters counters;
60 unsigned char elems[0];
61 };
62
63 static inline struct xt_entry_target *
compat_ip6t_get_target(struct compat_ip6t_entry * e)64 compat_ip6t_get_target(struct compat_ip6t_entry *e)
65 {
66 return (void *)e + e->target_offset;
67 }
68
69 #endif /* CONFIG_COMPAT */
70 #endif /* _IP6_TABLES_H */
71