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Linux/include/linux/netfilter_ipv4/ip_tables.h

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  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 IP 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 _IPTABLES_H
 16 #define _IPTABLES_H
 17 
 18 #include <linux/if.h>
 19 #include <linux/in.h>
 20 #include <linux/ip.h>
 21 #include <linux/skbuff.h>
 22 
 23 #include <linux/init.h>
 24 #include <uapi/linux/netfilter_ipv4/ip_tables.h>
 25 
 26 extern void ipt_init(void) __init;
 27 
 28 int ipt_register_table(struct net *net, const struct xt_table *table,
 29                        const struct ipt_replace *repl,
 30                        const struct nf_hook_ops *ops, struct xt_table **res);
 31 void ipt_unregister_table(struct net *net, struct xt_table *table,
 32                           const struct nf_hook_ops *ops);
 33 
 34 /* Standard entry. */
 35 struct ipt_standard {
 36         struct ipt_entry entry;
 37         struct xt_standard_target target;
 38 };
 39 
 40 struct ipt_error {
 41         struct ipt_entry entry;
 42         struct xt_error_target target;
 43 };
 44 
 45 #define IPT_ENTRY_INIT(__size)                                                 \
 46 {                                                                              \
 47         .target_offset  = sizeof(struct ipt_entry),                            \
 48         .next_offset    = (__size),                                            \
 49 }
 50 
 51 #define IPT_STANDARD_INIT(__verdict)                                           \
 52 {                                                                              \
 53         .entry          = IPT_ENTRY_INIT(sizeof(struct ipt_standard)),         \
 54         .target         = XT_TARGET_INIT(XT_STANDARD_TARGET,                   \
 55                                          sizeof(struct xt_standard_target)),   \
 56         .target.verdict = -(__verdict) - 1,                                    \
 57 }
 58 
 59 #define IPT_ERROR_INIT                                                         \
 60 {                                                                              \
 61         .entry          = IPT_ENTRY_INIT(sizeof(struct ipt_error)),            \
 62         .target         = XT_TARGET_INIT(XT_ERROR_TARGET,                      \
 63                                          sizeof(struct xt_error_target)),      \
 64         .target.errorname = "ERROR",                                           \
 65 }
 66 
 67 extern void *ipt_alloc_initial_table(const struct xt_table *);
 68 extern unsigned int ipt_do_table(struct sk_buff *skb,
 69                                  const struct nf_hook_state *state,
 70                                  struct xt_table *table);
 71 
 72 #ifdef CONFIG_COMPAT
 73 #include <net/compat.h>
 74 
 75 struct compat_ipt_entry {
 76         struct ipt_ip ip;
 77         compat_uint_t nfcache;
 78         __u16 target_offset;
 79         __u16 next_offset;
 80         compat_uint_t comefrom;
 81         struct compat_xt_counters counters;
 82         unsigned char elems[0];
 83 };
 84 
 85 /* Helper functions */
 86 static inline struct xt_entry_target *
 87 compat_ipt_get_target(struct compat_ipt_entry *e)
 88 {
 89         return (void *)e + e->target_offset;
 90 }
 91 
 92 #endif /* CONFIG_COMPAT */
 93 #endif /* _IPTABLES_H */
 94 

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