/*
* 25-Jul-1998 Major changes to allow for ip chain table
*
* 3-Jan-2000 Named tables to allow packet selection for different uses.
*/
/*
* Format of an IP firewall descriptor
*
* src, dst, src_mask, dst_mask are always stored in network byte order.
* flags are stored in host byte order (of course).
* Port numbers are stored in HOST byte order.
*/
#ifndef _IPTABLES_H
#define _IPTABLES_H
#ifdef __KERNEL__
#include <linux/if.h>
#include <linux/types.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/skbuff.h>
#endif
#include <linux/compiler.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter/x_tables.h>
#define IPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
#define IPT_TABLE_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
#define ipt_match xt_match
#define ipt_target xt_target
#define ipt_table xt_table
#define ipt_get_revision xt_get_revision
/* Yes, Virginia, you have to zero the padding. */
struct ipt_ip {
/* Source and destination IP addr */
struct in_addr src, dst;
/* Mask for src and dest IP addr */
struct in_addr smsk, dmsk;
char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
/* Protocol, 0 = ANY */
u_int16_t proto;
/* Flags word */
u_int8_t flags;
/* Inverse flags */
u_int8_t invflags;
};
struct ipt_entry_match
{
union {
struct {
u_int16_t match_size;
/* Used by userspace */
char name[IPT_FUNCTION_MAXNAMELEN-1];
u_int8_t revision;
} user;
struct {
u_int16_t match_size;
/* Used inside the kernel */
struct ipt_match *match;
} kernel;
/* Total length */
u_int16_t match_size;
} u;
unsigned char data[0];
};
struct ipt_entry_target
{
union {
struct {
u_int16_t target_size;
/* Used by userspace */
char name[IPT_FUNCTION_MAXNAMELEN-1];
u_int8_t revision;
} user;
struct {
u_int16_t target_size;
/* Used inside the kernel */
struct ipt_target *target;
} kernel;
/* Total length */
u_int16_t target_size;
} u;
unsigned char data[0];
};
struct ipt_standard_target
{
struct ipt_entry_target target;
int verdict;
};
#define ipt_counters xt_counters
/* Values for "flag" field in struct ipt_ip (general ip structure). */
#define IPT_F_FRAG 0x01 /* Set if rule is a fragment rule */
#define IPT_F_GOTO 0x02 /* Set if jump is a goto */
#define IPT_F_MASK 0x03 /* All possible flag bits mask. */
/* Values for "inv" field in struct ipt_ip. */
#define IPT_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */
#define IPT_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */
#define IPT_INV_TOS 0x04 /* Invert the sense of TOS. */
#define IPT_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */
#define IPT_INV_DSTIP 0x10 /* Invert the sense of DST OP. */
#define IPT_INV_FRAG 0x20 /* Invert the sense of FRAG. */
#define IPT_INV_PROTO XT_INV_PROTO
#define IPT_INV_MASK 0x7F /* All possible flag bits mask. */
/* This structure defines each of the firewall rules. Consists of 3
parts which are 1) general IP header stuff 2) match specific
stuff 3) the target to perform if the rule matches */
struct ipt_entry
{
struct ipt_ip ip;
/* Mark with fields that we care about. */
unsigned int nfcache;
/* Size of ipt_entry + matches */
u_int16_t target_offset;
/* Size of ipt_entry + matches + target */
u_int16_t next_offset;
/* Back pointer */
unsigned int comefrom;
/* Packet and byte counters. */
struct xt_counters counters;
/* The matches (if any), then the target. */
unsigned char elems[0];
};
/*
* New IP firewall options for [gs]etsockopt at the RAW IP level.
* Unlike BSD Linux inherits IP options so you don't have to use a raw
* socket for this. Instead we check rights in the calls. */
#define IPT_BASE_CTL XT_BASE_CTL
#define IPT_SO_SET_REPLACE XT_SO_SET_REPLACE
#define IPT_SO_SET_ADD_COUNTERS XT_SO_SET_ADD_COUNTERS
#define IPT_SO_SET_MAX XT_SO_SET_MAX
#define IPT_SO_GET_INFO XT_SO_GET_INFO
#define IPT_SO_GET_ENTRIES XT_SO_GET_ENTRIES
#define IPT_SO_GET_REVISION_MATCH XT_SO_GET_REVISION_MATCH
#define IPT_SO_GET_REVISION_TARGET XT_SO_GET_REVISION_TARGET
#define IPT_SO_GET_MAX XT_SO_GET_REVISION_TARGET
#define IPT_CONTINUE XT_CONTINUE
#define IPT_RETURN XT_RETURN
#include <linux/netfilter/xt_tcpudp.h>
#define ipt_udp xt_udp
#define ipt_tcp xt_tcp
#define IPT_TCP_INV_SRCPT XT_TCP_INV_SRCPT
#define IPT_TCP_INV_DSTPT XT_TCP_INV_DSTPT
#define IPT_TCP_INV_FLAGS XT_TCP_INV_FLAGS
#define IPT_TCP_INV_OPTION XT_TCP_INV_OPTION
#define IPT_TCP_INV_MASK XT_TCP_INV_MASK
#define IPT_UDP_INV_SRCPT XT_UDP_INV_SRCPT
#define IPT_UDP_INV_DSTPT XT_UDP_INV_DSTPT
#define IPT_UDP_INV_MASK XT_UDP_INV_MASK
/* ICMP matching stuff */
struct ipt_icmp
{
u_int8_t type; /* type to match */
u_int8_t code[2]; /* range of code */
u_int8_t invflags; /* Inverse flags */
};
/* Values for "inv" field for struct ipt_icmp. */
#define IPT_ICMP_INV 0x01 /* Invert the sense of type/code test */
/* The argument to IPT_SO_GET_INFO */
struct ipt_getinfo
{
/* Which table: caller fills this in. */
char name[IPT_TABLE_MAXNAMELEN];
/* Kernel fills these in. */
/* Which hook entry points are valid: bitmask */
unsigned int valid_hooks;
/* Hook entry points: one per netfilter hook. */
unsigned int hook_entry[NF_IP_NUMHOOKS];
/* Underflow points. */
unsigned int underflow[NF_IP_NUMHOOKS];
/* Number of entries */
unsigned int num_entries;
/* Size of entries. */
unsigned int size;
};
/* The argument to IPT_SO_SET_REPLACE. */
struct ipt_replace
{
/* Which table. */
char name[IPT_TABLE_MAXNAMELEN];
/* Which hook entry points are valid: bitmask. You can't
change this. */
unsigned int valid_hooks;
/* Number of entries */
unsigned int num_entries;
/* Total size of new entries */
unsigned int size;
/* Hook entry points. */
unsigned int hook_entry[NF_IP_NUMHOOKS];
/* Underflow points. */
unsigned int underflow[NF_IP_NUMHOOKS];
/* Information about old entries: */
/* Number of counters (must be equal to current number of entries). */
unsigned int num_counters;
/* The old entries' counters. */
struct xt_counters __user *counters;
/* The entries (hang off end: not really an array). */
struct ipt_entry entries[0];
};
/* The argument to IPT_SO_ADD_COUNTERS. */
#define ipt_counters_info xt_counters_info
/* The argument to IPT_SO_GET_ENTRIES. */
struct ipt_get_entries
{
/* Which table: user fills this in. */
char name[IPT_TABLE_MAXNAMELEN];
/* User fills this in: total entry size. */
unsigned int size;
/* The entries. */
struct ipt_entry entrytable[0];
};
/* Standard return verdict, or do jump. */
#define IPT_STANDARD_TARGET XT_STANDARD_TARGET
/* Error verdict. */
#define IPT_ERROR_TARGET XT_ERROR_TARGET
/* Helper functions */
static __inline__ struct ipt_entry_target *
ipt_get_target(struct ipt_entry *e)
{
return (void *)e + e->target_offset;
}
/* fn returns 0 to continue iteration */
#define IPT_MATCH_ITERATE(e, fn, args...) \
({ \
unsigned int __i; \
int __ret = 0; \
struct ipt_entry_match *__match; \
\
for (__i = sizeof(struct ipt_entry); \
__i < (e)->target_offset; \
__i += __match->u.match_size) { \
__match = (void *)(e) + __i; \
\
__ret = fn(__match , ## args); \
if (__ret != 0) \
break; \
} \
__ret; \
})
/* fn returns 0 to continue iteration */
#define IPT_ENTRY_ITERATE(entries, size, fn, args...) \
({ \
unsigned int __i; \
int __ret = 0; \
struct ipt_entry *__entry; \
\
for (__i = 0; __i < (size); __i += __entry->next_offset) { \
__entry = (void *)(entries) + __i; \
\
__ret = fn(__entry , ## args); \
if (__ret != 0) \
break; \
} \
__ret; \
})
/*
* Main firewall chains definitions and global var's definitions.
*/
#ifdef __KERNEL__
#include <linux/init.h>
extern void ipt_init(void) __init;
#define ipt_register_target(tgt) \
({ (tgt)->family = AF_INET; \
xt_register_target(tgt); })
#define ipt_unregister_target(tgt) xt_unregister_target(tgt)
#define ipt_register_match(mtch) \
({ (mtch)->family = AF_INET; \
xt_register_match(mtch); })
#define ipt_unregister_match(mtch) xt_unregister_match(mtch)
//#define ipt_register_table(tbl, repl) xt_register_table(AF_INET, tbl, repl)
//#define ipt_unregister_table(tbl) xt_unregister_table(AF_INET, tbl)
extern int ipt_register_table(struct ipt_table *table,
const struct ipt_replace *repl);
extern void ipt_unregister_table(struct ipt_table *table);
/* net/sched/ipt.c: Gimme access to your targets! Gets target->me. */
extern struct ipt_target *ipt_find_target(const char *name, u8 revision);
/* Standard entry. */
struct ipt_standard
{
struct ipt_entry entry;
struct ipt_standard_target target;
};
struct ipt_error_target
{
struct ipt_entry_target target;
char errorname[IPT_FUNCTION_MAXNAMELEN];
};
struct ipt_error
{
struct ipt_entry entry;
struct ipt_error_target target;
};
extern unsigned int ipt_do_table(struct sk_buff **pskb,
unsigned int hook,
const struct net_device *in,
const struct net_device *out,
struct ipt_table *table,
void *userdata);
#define IPT_ALIGN(s) XT_ALIGN(s)
#endif /*__KERNEL__*/
#endif /* _IPTABLES_H */
