Move ip6t_standard/ip6t_error_target/ip6t_error definitions to ip6_tables.h instead of defining them in each table individually. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
331 lines
8.7 KiB
C
331 lines
8.7 KiB
C
/*
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* 25-Jul-1998 Major changes to allow for ip chain table
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*
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* 3-Jan-2000 Named tables to allow packet selection for different uses.
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*/
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/*
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* Format of an IP6 firewall descriptor
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*
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* src, dst, src_mask, dst_mask are always stored in network byte order.
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* flags are stored in host byte order (of course).
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* Port numbers are stored in HOST byte order.
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*/
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#ifndef _IP6_TABLES_H
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#define _IP6_TABLES_H
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#ifdef __KERNEL__
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#include <linux/if.h>
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#include <linux/types.h>
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#include <linux/in6.h>
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#include <linux/ipv6.h>
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#include <linux/skbuff.h>
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#endif
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#include <linux/compiler.h>
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#include <linux/netfilter_ipv6.h>
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#include <linux/netfilter/x_tables.h>
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#define IP6T_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
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#define IP6T_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
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#define ip6t_match xt_match
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#define ip6t_target xt_target
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#define ip6t_table xt_table
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#define ip6t_get_revision xt_get_revision
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/* Yes, Virginia, you have to zero the padding. */
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struct ip6t_ip6 {
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/* Source and destination IP6 addr */
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struct in6_addr src, dst;
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/* Mask for src and dest IP6 addr */
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struct in6_addr smsk, dmsk;
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char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
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unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
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/* ARGH, HopByHop uses 0, so can't do 0 = ANY,
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instead IP6T_F_NOPROTO must be set */
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u_int16_t proto;
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/* TOS to match iff flags & IP6T_F_TOS */
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u_int8_t tos;
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/* Flags word */
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u_int8_t flags;
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/* Inverse flags */
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u_int8_t invflags;
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};
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#define ip6t_entry_match xt_entry_match
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#define ip6t_entry_target xt_entry_target
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#define ip6t_standard_target xt_standard_target
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#define ip6t_counters xt_counters
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/* Values for "flag" field in struct ip6t_ip6 (general ip6 structure). */
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#define IP6T_F_PROTO 0x01 /* Set if rule cares about upper
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protocols */
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#define IP6T_F_TOS 0x02 /* Match the TOS. */
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#define IP6T_F_GOTO 0x04 /* Set if jump is a goto */
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#define IP6T_F_MASK 0x07 /* All possible flag bits mask. */
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/* Values for "inv" field in struct ip6t_ip6. */
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#define IP6T_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */
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#define IP6T_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */
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#define IP6T_INV_TOS 0x04 /* Invert the sense of TOS. */
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#define IP6T_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */
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#define IP6T_INV_DSTIP 0x10 /* Invert the sense of DST OP. */
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#define IP6T_INV_FRAG 0x20 /* Invert the sense of FRAG. */
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#define IP6T_INV_PROTO XT_INV_PROTO
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#define IP6T_INV_MASK 0x7F /* All possible flag bits mask. */
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/* This structure defines each of the firewall rules. Consists of 3
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parts which are 1) general IP header stuff 2) match specific
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stuff 3) the target to perform if the rule matches */
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struct ip6t_entry
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{
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struct ip6t_ip6 ipv6;
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/* Mark with fields that we care about. */
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unsigned int nfcache;
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/* Size of ipt_entry + matches */
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u_int16_t target_offset;
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/* Size of ipt_entry + matches + target */
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u_int16_t next_offset;
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/* Back pointer */
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unsigned int comefrom;
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/* Packet and byte counters. */
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struct xt_counters counters;
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/* The matches (if any), then the target. */
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unsigned char elems[0];
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};
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/* Standard entry */
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struct ip6t_standard
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{
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struct ip6t_entry entry;
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struct ip6t_standard_target target;
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};
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struct ip6t_error_target
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{
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struct ip6t_entry_target target;
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char errorname[IP6T_FUNCTION_MAXNAMELEN];
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};
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struct ip6t_error
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{
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struct ip6t_entry entry;
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struct ip6t_error_target target;
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};
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/*
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* New IP firewall options for [gs]etsockopt at the RAW IP level.
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* Unlike BSD Linux inherits IP options so you don't have to use
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* a raw socket for this. Instead we check rights in the calls.
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*
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* ATTENTION: check linux/in6.h before adding new number here.
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*/
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#define IP6T_BASE_CTL 64
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#define IP6T_SO_SET_REPLACE (IP6T_BASE_CTL)
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#define IP6T_SO_SET_ADD_COUNTERS (IP6T_BASE_CTL + 1)
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#define IP6T_SO_SET_MAX IP6T_SO_SET_ADD_COUNTERS
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#define IP6T_SO_GET_INFO (IP6T_BASE_CTL)
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#define IP6T_SO_GET_ENTRIES (IP6T_BASE_CTL + 1)
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#define IP6T_SO_GET_REVISION_MATCH (IP6T_BASE_CTL + 4)
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#define IP6T_SO_GET_REVISION_TARGET (IP6T_BASE_CTL + 5)
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#define IP6T_SO_GET_MAX IP6T_SO_GET_REVISION_TARGET
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/* CONTINUE verdict for targets */
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#define IP6T_CONTINUE XT_CONTINUE
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/* For standard target */
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#define IP6T_RETURN XT_RETURN
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/* TCP/UDP matching stuff */
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#include <linux/netfilter/xt_tcpudp.h>
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#define ip6t_tcp xt_tcp
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#define ip6t_udp xt_udp
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/* Values for "inv" field in struct ipt_tcp. */
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#define IP6T_TCP_INV_SRCPT XT_TCP_INV_SRCPT
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#define IP6T_TCP_INV_DSTPT XT_TCP_INV_DSTPT
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#define IP6T_TCP_INV_FLAGS XT_TCP_INV_FLAGS
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#define IP6T_TCP_INV_OPTION XT_TCP_INV_OPTION
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#define IP6T_TCP_INV_MASK XT_TCP_INV_MASK
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/* Values for "invflags" field in struct ipt_udp. */
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#define IP6T_UDP_INV_SRCPT XT_UDP_INV_SRCPT
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#define IP6T_UDP_INV_DSTPT XT_UDP_INV_DSTPT
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#define IP6T_UDP_INV_MASK XT_UDP_INV_MASK
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/* ICMP matching stuff */
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struct ip6t_icmp
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{
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u_int8_t type; /* type to match */
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u_int8_t code[2]; /* range of code */
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u_int8_t invflags; /* Inverse flags */
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};
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/* Values for "inv" field for struct ipt_icmp. */
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#define IP6T_ICMP_INV 0x01 /* Invert the sense of type/code test */
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/* The argument to IP6T_SO_GET_INFO */
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struct ip6t_getinfo
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{
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/* Which table: caller fills this in. */
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char name[IP6T_TABLE_MAXNAMELEN];
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/* Kernel fills these in. */
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/* Which hook entry points are valid: bitmask */
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unsigned int valid_hooks;
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/* Hook entry points: one per netfilter hook. */
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unsigned int hook_entry[NF_IP6_NUMHOOKS];
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/* Underflow points. */
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unsigned int underflow[NF_IP6_NUMHOOKS];
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/* Number of entries */
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unsigned int num_entries;
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/* Size of entries. */
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unsigned int size;
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};
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/* The argument to IP6T_SO_SET_REPLACE. */
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struct ip6t_replace
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{
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/* Which table. */
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char name[IP6T_TABLE_MAXNAMELEN];
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/* Which hook entry points are valid: bitmask. You can't
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change this. */
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unsigned int valid_hooks;
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/* Number of entries */
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unsigned int num_entries;
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/* Total size of new entries */
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unsigned int size;
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/* Hook entry points. */
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unsigned int hook_entry[NF_IP6_NUMHOOKS];
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/* Underflow points. */
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unsigned int underflow[NF_IP6_NUMHOOKS];
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/* Information about old entries: */
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/* Number of counters (must be equal to current number of entries). */
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unsigned int num_counters;
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/* The old entries' counters. */
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struct xt_counters __user *counters;
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/* The entries (hang off end: not really an array). */
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struct ip6t_entry entries[0];
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};
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/* The argument to IP6T_SO_ADD_COUNTERS. */
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#define ip6t_counters_info xt_counters_info
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/* The argument to IP6T_SO_GET_ENTRIES. */
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struct ip6t_get_entries
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{
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/* Which table: user fills this in. */
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char name[IP6T_TABLE_MAXNAMELEN];
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/* User fills this in: total entry size. */
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unsigned int size;
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/* The entries. */
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struct ip6t_entry entrytable[0];
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};
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/* Standard return verdict, or do jump. */
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#define IP6T_STANDARD_TARGET XT_STANDARD_TARGET
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/* Error verdict. */
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#define IP6T_ERROR_TARGET XT_ERROR_TARGET
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/* Helper functions */
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static __inline__ struct ip6t_entry_target *
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ip6t_get_target(struct ip6t_entry *e)
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{
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return (void *)e + e->target_offset;
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}
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/* fn returns 0 to continue iteration */
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#define IP6T_MATCH_ITERATE(e, fn, args...) \
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({ \
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unsigned int __i; \
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int __ret = 0; \
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struct ip6t_entry_match *__m; \
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\
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for (__i = sizeof(struct ip6t_entry); \
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__i < (e)->target_offset; \
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__i += __m->u.match_size) { \
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__m = (void *)(e) + __i; \
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\
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__ret = fn(__m , ## args); \
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if (__ret != 0) \
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break; \
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} \
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__ret; \
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})
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/* fn returns 0 to continue iteration */
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#define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \
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({ \
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unsigned int __i; \
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int __ret = 0; \
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struct ip6t_entry *__e; \
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\
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for (__i = 0; __i < (size); __i += __e->next_offset) { \
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__e = (void *)(entries) + __i; \
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\
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__ret = fn(__e , ## args); \
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if (__ret != 0) \
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break; \
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} \
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__ret; \
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})
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/*
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* Main firewall chains definitions and global var's definitions.
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*/
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#ifdef __KERNEL__
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#include <linux/init.h>
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extern void ip6t_init(void) __init;
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extern int ip6t_register_table(struct xt_table *table,
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const struct ip6t_replace *repl);
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extern void ip6t_unregister_table(struct xt_table *table);
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extern unsigned int ip6t_do_table(struct sk_buff **pskb,
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unsigned int hook,
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const struct net_device *in,
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const struct net_device *out,
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struct xt_table *table);
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/* Check for an extension */
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extern int ip6t_ext_hdr(u8 nexthdr);
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/* find specified header and get offset to it */
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extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
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int target, unsigned short *fragoff);
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extern int ip6_masked_addrcmp(const struct in6_addr *addr1,
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const struct in6_addr *mask,
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const struct in6_addr *addr2);
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#define IP6T_ALIGN(s) (((s) + (__alignof__(struct ip6t_entry)-1)) & ~(__alignof__(struct ip6t_entry)-1))
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#endif /*__KERNEL__*/
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#endif /* _IP6_TABLES_H */
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