1 /* 2 * 25-Jul-1998 Major changes to allow for ip chain table 3 * 4 * 3-Jan-2000 Named tables to allow packet selection for different uses. 5 */ 6 7 /* 8 * Format of an IP firewall descriptor 9 * 10 * src, dst, src_mask, dst_mask are always stored in network byte order. 11 * flags are stored in host byte order (of course). 12 * Port numbers are stored in HOST byte order. 13 */ 14 #ifndef _IPTABLES_H 15 #define _IPTABLES_H 16 17 #include <linux/if.h> 18 #include <linux/in.h> 19 #include <linux/ip.h> 20 #include <linux/skbuff.h> 21 22 #include <linux/init.h> 23 #include <uapi/linux/netfilter_ipv4/ip_tables.h> 24 25 extern void ipt_init(void) __init; 26 27 int ipt_register_table(struct net *net, const struct xt_table *table, 28 const struct ipt_replace *repl, 29 const struct nf_hook_ops *ops, struct xt_table **res); 30 void ipt_unregister_table(struct net *net, struct xt_table *table, 31 const struct nf_hook_ops *ops); 32 33 /* Standard entry. */ 34 struct ipt_standard { 35 struct ipt_entry entry; 36 struct xt_standard_target target; 37 }; 38 39 struct ipt_error { 40 struct ipt_entry entry; 41 struct xt_error_target target; 42 }; 43 44 #define IPT_ENTRY_INIT(__size) \ 45 { \ 46 .target_offset = sizeof(struct ipt_entry), \ 47 .next_offset = (__size), \ 48 } 49 50 #define IPT_STANDARD_INIT(__verdict) \ 51 { \ 52 .entry = IPT_ENTRY_INIT(sizeof(struct ipt_standard)), \ 53 .target = XT_TARGET_INIT(XT_STANDARD_TARGET, \ 54 sizeof(struct xt_standard_target)), \ 55 .target.verdict = -(__verdict) - 1, \ 56 } 57 58 #define IPT_ERROR_INIT \ 59 { \ 60 .entry = IPT_ENTRY_INIT(sizeof(struct ipt_error)), \ 61 .target = XT_TARGET_INIT(XT_ERROR_TARGET, \ 62 sizeof(struct xt_error_target)), \ 63 .target.errorname = "ERROR", \ 64 } 65 66 extern void *ipt_alloc_initial_table(const struct xt_table *); 67 extern unsigned int ipt_do_table(struct sk_buff *skb, 68 const struct nf_hook_state *state, 69 struct xt_table *table); 70 71 #ifdef CONFIG_COMPAT 72 #include <net/compat.h> 73 74 struct compat_ipt_entry { 75 struct ipt_ip ip; 76 compat_uint_t nfcache; 77 __u16 target_offset; 78 __u16 next_offset; 79 compat_uint_t comefrom; 80 struct compat_xt_counters counters; 81 unsigned char elems[0]; 82 }; 83 84 /* Helper functions */ 85 static inline struct xt_entry_target * 86 compat_ipt_get_target(struct compat_ipt_entry *e) 87 { 88 return (void *)e + e->target_offset; 89 } 90 91 #endif /* CONFIG_COMPAT */ 92 #endif /* _IPTABLES_H */ 93
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