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