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