The C and C++ Include Header Files

/usr/include/linux/netfilter_ipv6/ip6_tables.h


$ cat -n /usr/include/linux/netfilter_ipv6/ip6_tables.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     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 IP6 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	
    16	#ifndef _IP6_TABLES_H
    17	#define _IP6_TABLES_H
    18	
    19	#include <linux/types.h>
    20	
    21	#include <linux/if.h>
    22	#include <linux/netfilter_ipv6.h>
    23	
    24	#include <linux/netfilter/x_tables.h>
    25	
    26	#define IP6T_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
    27	#define IP6T_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
    28	#define ip6t_match xt_match
    29	#define ip6t_target xt_target
    30	#define ip6t_table xt_table
    31	#define ip6t_get_revision xt_get_revision
    32	#define ip6t_entry_match xt_entry_match
    33	#define ip6t_entry_target xt_entry_target
    34	#define ip6t_standard_target xt_standard_target
    35	#define ip6t_error_target xt_error_target
    36	#define ip6t_counters xt_counters
    37	#define IP6T_CONTINUE XT_CONTINUE
    38	#define IP6T_RETURN XT_RETURN
    39	
    40	/* Pre-iptables-1.4.0 */
    41	#include <linux/netfilter/xt_tcpudp.h>
    42	#define ip6t_tcp xt_tcp
    43	#define ip6t_udp xt_udp
    44	#define IP6T_TCP_INV_SRCPT	XT_TCP_INV_SRCPT
    45	#define IP6T_TCP_INV_DSTPT	XT_TCP_INV_DSTPT
    46	#define IP6T_TCP_INV_FLAGS	XT_TCP_INV_FLAGS
    47	#define IP6T_TCP_INV_OPTION	XT_TCP_INV_OPTION
    48	#define IP6T_TCP_INV_MASK	XT_TCP_INV_MASK
    49	#define IP6T_UDP_INV_SRCPT	XT_UDP_INV_SRCPT
    50	#define IP6T_UDP_INV_DSTPT	XT_UDP_INV_DSTPT
    51	#define IP6T_UDP_INV_MASK	XT_UDP_INV_MASK
    52	
    53	#define ip6t_counters_info xt_counters_info
    54	#define IP6T_STANDARD_TARGET XT_STANDARD_TARGET
    55	#define IP6T_ERROR_TARGET XT_ERROR_TARGET
    56	#define IP6T_MATCH_ITERATE(e, fn, args...) \
    57		XT_MATCH_ITERATE(struct ip6t_entry, e, fn, ## args)
    58	#define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \
    59		XT_ENTRY_ITERATE(struct ip6t_entry, entries, size, fn, ## args)
    60	
    61	/* Yes, Virginia, you have to zero the padding. */
    62	struct ip6t_ip6 {
    63		/* Source and destination IP6 addr */
    64		struct in6_addr src, dst;		
    65		/* Mask for src and dest IP6 addr */
    66		struct in6_addr smsk, dmsk;
    67		char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
    68		unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
    69	
    70		/* Upper protocol number
    71		 * - The allowed value is 0 (any) or protocol number of last parsable
    72		 *   header, which is 50 (ESP), 59 (No Next Header), 135 (MH), or
    73		 *   the non IPv6 extension headers.
    74		 * - The protocol numbers of IPv6 extension headers except of ESP and
    75		 *   MH do not match any packets.
    76		 * - You also need to set IP6T_FLAGS_PROTO to "flags" to check protocol.
    77		 */
    78		__u16 proto;
    79		/* TOS to match iff flags & IP6T_F_TOS */
    80		__u8 tos;
    81	
    82		/* Flags word */
    83		__u8 flags;
    84		/* Inverse flags */
    85		__u8 invflags;
    86	};
    87	
    88	/* Values for "flag" field in struct ip6t_ip6 (general ip6 structure). */
    89	#define IP6T_F_PROTO		0x01	/* Set if rule cares about upper 
    90						   protocols */
    91	#define IP6T_F_TOS		0x02	/* Match the TOS. */
    92	#define IP6T_F_GOTO		0x04	/* Set if jump is a goto */
    93	#define IP6T_F_MASK		0x07	/* All possible flag bits mask. */
    94	
    95	/* Values for "inv" field in struct ip6t_ip6. */
    96	#define IP6T_INV_VIA_IN		0x01	/* Invert the sense of IN IFACE. */
    97	#define IP6T_INV_VIA_OUT		0x02	/* Invert the sense of OUT IFACE */
    98	#define IP6T_INV_TOS		0x04	/* Invert the sense of TOS. */
    99	#define IP6T_INV_SRCIP		0x08	/* Invert the sense of SRC IP. */
   100	#define IP6T_INV_DSTIP		0x10	/* Invert the sense of DST OP. */
   101	#define IP6T_INV_FRAG		0x20	/* Invert the sense of FRAG. */
   102	#define IP6T_INV_PROTO		XT_INV_PROTO
   103	#define IP6T_INV_MASK		0x7F	/* All possible flag bits mask. */
   104	
   105	/* This structure defines each of the firewall rules.  Consists of 3
   106	   parts which are 1) general IP header stuff 2) match specific
   107	   stuff 3) the target to perform if the rule matches */
   108	struct ip6t_entry {
   109		struct ip6t_ip6 ipv6;
   110	
   111		/* Mark with fields that we care about. */
   112		unsigned int nfcache;
   113	
   114		/* Size of ipt_entry + matches */
   115		__u16 target_offset;
   116		/* Size of ipt_entry + matches + target */
   117		__u16 next_offset;
   118	
   119		/* Back pointer */
   120		unsigned int comefrom;
   121	
   122		/* Packet and byte counters. */
   123		struct xt_counters counters;
   124	
   125		/* The matches (if any), then the target. */
   126		unsigned char elems[0];
   127	};
   128	
   129	/* Standard entry */
   130	struct ip6t_standard {
   131		struct ip6t_entry entry;
   132		struct xt_standard_target target;
   133	};
   134	
   135	struct ip6t_error {
   136		struct ip6t_entry entry;
   137		struct xt_error_target target;
   138	};
   139	
   140	#define IP6T_ENTRY_INIT(__size)						       \
   141	{									       \
   142		.target_offset	= sizeof(struct ip6t_entry),			       \
   143		.next_offset	= (__size),					       \
   144	}
   145	
   146	#define IP6T_STANDARD_INIT(__verdict)					       \
   147	{									       \
   148		.entry		= IP6T_ENTRY_INIT(sizeof(struct ip6t_standard)),       \
   149		.target		= XT_TARGET_INIT(XT_STANDARD_TARGET,		       \
   150						 sizeof(struct xt_standard_target)),   \
   151		.target.verdict	= -(__verdict) - 1,				       \
   152	}
   153	
   154	#define IP6T_ERROR_INIT							       \
   155	{									       \
   156		.entry		= IP6T_ENTRY_INIT(sizeof(struct ip6t_error)),	       \
   157		.target		= XT_TARGET_INIT(XT_ERROR_TARGET,		       \
   158						 sizeof(struct xt_error_target)),      \
   159		.target.errorname = "ERROR",					       \
   160	}
   161	
   162	/*
   163	 * New IP firewall options for [gs]etsockopt at the RAW IP level.
   164	 * Unlike BSD Linux inherits IP options so you don't have to use
   165	 * a raw socket for this. Instead we check rights in the calls.
   166	 *
   167	 * ATTENTION: check linux/in6.h before adding new number here.
   168	 */
   169	#define IP6T_BASE_CTL			64
   170	
   171	#define IP6T_SO_SET_REPLACE		(IP6T_BASE_CTL)
   172	#define IP6T_SO_SET_ADD_COUNTERS	(IP6T_BASE_CTL + 1)
   173	#define IP6T_SO_SET_MAX			IP6T_SO_SET_ADD_COUNTERS
   174	
   175	#define IP6T_SO_GET_INFO		(IP6T_BASE_CTL)
   176	#define IP6T_SO_GET_ENTRIES		(IP6T_BASE_CTL + 1)
   177	#define IP6T_SO_GET_REVISION_MATCH	(IP6T_BASE_CTL + 4)
   178	#define IP6T_SO_GET_REVISION_TARGET	(IP6T_BASE_CTL + 5)
   179	#define IP6T_SO_GET_MAX			IP6T_SO_GET_REVISION_TARGET
   180	
   181	/* obtain original address if REDIRECT'd connection */
   182	#define IP6T_SO_ORIGINAL_DST            80
   183	
   184	/* ICMP matching stuff */
   185	struct ip6t_icmp {
   186		__u8 type;				/* type to match */
   187		__u8 code[2];				/* range of code */
   188		__u8 invflags;				/* Inverse flags */
   189	};
   190	
   191	/* Values for "inv" field for struct ipt_icmp. */
   192	#define IP6T_ICMP_INV	0x01	/* Invert the sense of type/code test */
   193	
   194	/* The argument to IP6T_SO_GET_INFO */
   195	struct ip6t_getinfo {
   196		/* Which table: caller fills this in. */
   197		char name[XT_TABLE_MAXNAMELEN];
   198	
   199		/* Kernel fills these in. */
   200		/* Which hook entry points are valid: bitmask */
   201		unsigned int valid_hooks;
   202	
   203		/* Hook entry points: one per netfilter hook. */
   204		unsigned int hook_entry[NF_INET_NUMHOOKS];
   205	
   206		/* Underflow points. */
   207		unsigned int underflow[NF_INET_NUMHOOKS];
   208	
   209		/* Number of entries */
   210		unsigned int num_entries;
   211	
   212		/* Size of entries. */
   213		unsigned int size;
   214	};
   215	
   216	/* The argument to IP6T_SO_SET_REPLACE. */
   217	struct ip6t_replace {
   218		/* Which table. */
   219		char name[XT_TABLE_MAXNAMELEN];
   220	
   221		/* Which hook entry points are valid: bitmask.  You can't
   222	           change this. */
   223		unsigned int valid_hooks;
   224	
   225		/* Number of entries */
   226		unsigned int num_entries;
   227	
   228		/* Total size of new entries */
   229		unsigned int size;
   230	
   231		/* Hook entry points. */
   232		unsigned int hook_entry[NF_INET_NUMHOOKS];
   233	
   234		/* Underflow points. */
   235		unsigned int underflow[NF_INET_NUMHOOKS];
   236	
   237		/* Information about old entries: */
   238		/* Number of counters (must be equal to current number of entries). */
   239		unsigned int num_counters;
   240		/* The old entries' counters. */
   241		struct xt_counters *counters;
   242	
   243		/* The entries (hang off end: not really an array). */
   244		struct ip6t_entry entries[];
   245	};
   246	
   247	/* The argument to IP6T_SO_GET_ENTRIES. */
   248	struct ip6t_get_entries {
   249		/* Which table: user fills this in. */
   250		char name[XT_TABLE_MAXNAMELEN];
   251	
   252		/* User fills this in: total entry size. */
   253		unsigned int size;
   254	
   255		/* The entries. */
   256		struct ip6t_entry entrytable[];
   257	};
   258	
   259	/* Helper functions */
   260	static __inline__ struct xt_entry_target *
   261	ip6t_get_target(struct ip6t_entry *e)
   262	{
   263		return (struct xt_entry_target *)((char *)e + e->target_offset);
   264	}
   265	
   266	/*
   267	 *	Main firewall chains definitions and global var's definitions.
   268	 */
   269	
   270	#endif /* _IP6_TABLES_H */