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