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📄 ip_tables.h /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note / / * 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 #include <linux/types.h> #include <linux/if.h> #include <linux/netfilter_ipv4.h> #include <linux/netfilter/x_tables.h> #define IPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN #define IPT_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN #define ipt_match xt_match #define ipt_target xt_target #define ipt_table xt_table #define ipt_get_revision xt_get_revision #define ipt_entry_match xt_entry_match #define ipt_entry_target xt_entry_target #define ipt_standard_target xt_standard_target #define ipt_error_target xt_error_target #define ipt_counters xt_counters #define IPT_CONTINUE XT_CONTINUE #define IPT_RETURN XT_RETURN / This group is older than old (iptables < v1.4.0-rc1~89) / #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 / The argument to IPT_SO_ADD_COUNTERS. / #define ipt_counters_info xt_counters_info / Standard return verdict, or do jump. / #define IPT_STANDARD_TARGET XT_STANDARD_TARGET / Error verdict. / #define IPT_ERROR_TARGET XT_ERROR_TARGET / fn returns 0 to continue iteration / #define IPT_MATCH_ITERATE(e, fn, args...) \ XT_MATCH_ITERATE(struct ipt_entry, e, fn, ## args) / fn returns 0 to continue iteration / #define IPT_ENTRY_ITERATE(entries, size, fn, args...) \ XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args) / 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 / __u16 proto; / Flags word / __u8 flags; / Inverse flags / __u8 invflags; }; / 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 / __u16 target_offset; / Size of ipt_entry + matches + target / __u16 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. * * ATTENTION: check linux/in.h before adding new number here. / #define IPT_BASE_CTL 64 #define IPT_SO_SET_REPLACE (IPT_BASE_CTL) #define IPT_SO_SET_ADD_COUNTERS (IPT_BASE_CTL + 1) #define IPT_SO_SET_MAX IPT_SO_SET_ADD_COUNTERS #define IPT_SO_GET_INFO (IPT_BASE_CTL) #define IPT_SO_GET_ENTRIES (IPT_BASE_CTL + 1) #define IPT_SO_GET_REVISION_MATCH (IPT_BASE_CTL + 2) #define IPT_SO_GET_REVISION_TARGET (IPT_BASE_CTL + 3) #define IPT_SO_GET_MAX IPT_SO_GET_REVISION_TARGET / ICMP matching stuff / struct ipt_icmp { __u8 type; / type to match / __u8 code[2]; / range of code / __u8 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[XT_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_INET_NUMHOOKS]; / Underflow points. / unsigned int underflow[NF_INET_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[XT_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_INET_NUMHOOKS]; / Underflow points. / unsigned int underflow[NF_INET_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 counters; /* The entries (hang off end: not really an array). / struct ipt_entry entries[0]; }; / The argument to IPT_SO_GET_ENTRIES. / struct ipt_get_entries { / Which table: user fills this in. / char name[XT_TABLE_MAXNAMELEN]; / User fills this in: total entry size. / unsigned int size; / The entries. / struct ipt_entry entrytable[0]; }; / Helper functions / static __inline__ struct xt_entry_target ipt_get_target(struct ipt_entry e) { return (struct xt_entry_target )((char )e + e->target_offset); } / * Main firewall chains definitions and global var's definitions. / #endif / _IPTABLES_H */	6.52 KB	2026-03-24 10:01
📄 ipt_CLUSTERIP.h /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note / #ifndef _IPT_CLUSTERIP_H_target #define _IPT_CLUSTERIP_H_target #include <linux/types.h> #include <linux/if_ether.h> enum clusterip_hashmode { CLUSTERIP_HASHMODE_SIP = 0, CLUSTERIP_HASHMODE_SIP_SPT, CLUSTERIP_HASHMODE_SIP_SPT_DPT, }; #define CLUSTERIP_HASHMODE_MAX CLUSTERIP_HASHMODE_SIP_SPT_DPT #define CLUSTERIP_MAX_NODES 16 #define CLUSTERIP_FLAG_NEW 0x00000001 struct clusterip_config; struct ipt_clusterip_tgt_info { __u32 flags; / only relevant for new ones / __u8 clustermac[ETH_ALEN]; __u16 num_total_nodes; __u16 num_local_nodes; __u16 local_nodes[CLUSTERIP_MAX_NODES]; __u32 hash_mode; __u32 hash_initval; / Used internally by the kernel / struct clusterip_config config; }; #endif /_IPT_CLUSTERIP_H_target/	821 B	2026-03-24 10:01
📄 ipt_ECN.h /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note / / Header file for iptables ipt_ECN target * * (C) 2002 by Harald Welte <laforge@gnumonks.org> * * This software is distributed under GNU GPL v2, 1991 * * ipt_ECN.h,v 1.3 2002/05/29 12:17:40 laforge Exp / #ifndef _IPT_ECN_TARGET_H #define _IPT_ECN_TARGET_H #include <linux/types.h> #include <linux/netfilter/xt_DSCP.h> #define IPT_ECN_IP_MASK (~XT_DSCP_MASK) #define IPT_ECN_OP_SET_IP 0x01 / set ECN bits of IPv4 header / #define IPT_ECN_OP_SET_ECE 0x10 / set ECE bit of TCP header / #define IPT_ECN_OP_SET_CWR 0x20 / set CWR bit of TCP header / #define IPT_ECN_OP_MASK 0xce struct ipt_ECN_info { __u8 operation; / bitset of operations / __u8 ip_ect; / ECT codepoint of IPv4 header, pre-shifted / union { struct { __u8 ece:1, cwr:1; / TCP ECT bits / } tcp; } proto; }; #endif / _IPT_ECN_TARGET_H */	901 B	2026-03-24 10:01
📄 ipt_LOG.h /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note / #ifndef _IPT_LOG_H #define _IPT_LOG_H / make sure not to change this without changing netfilter.h:NF_LOG_* (!) / #define IPT_LOG_TCPSEQ 0x01 / Log TCP sequence numbers / #define IPT_LOG_TCPOPT 0x02 / Log TCP options / #define IPT_LOG_IPOPT 0x04 / Log IP options / #define IPT_LOG_UID 0x08 / Log UID owning local socket / #define IPT_LOG_NFLOG 0x10 / Unsupported, don't reuse / #define IPT_LOG_MACDECODE 0x20 / Decode MAC header / #define IPT_LOG_MASK 0x2f struct ipt_log_info { unsigned char level; unsigned char logflags; char prefix[30]; }; #endif /_IPT_LOG_H*/	654 B	2026-03-24 10:01
📄 ipt_REJECT.h /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note / #ifndef _IPT_REJECT_H #define _IPT_REJECT_H enum ipt_reject_with { IPT_ICMP_NET_UNREACHABLE, IPT_ICMP_HOST_UNREACHABLE, IPT_ICMP_PROT_UNREACHABLE, IPT_ICMP_PORT_UNREACHABLE, IPT_ICMP_ECHOREPLY, IPT_ICMP_NET_PROHIBITED, IPT_ICMP_HOST_PROHIBITED, IPT_TCP_RESET, IPT_ICMP_ADMIN_PROHIBITED }; struct ipt_reject_info { enum ipt_reject_with with; / reject type / }; #endif /_IPT_REJECT_H*/	468 B	2026-03-24 10:01
📄 ipt_TTL.h /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note / / TTL modification module for IP tables * (C) 2000 by Harald Welte <laforge@netfilter.org> */ #ifndef _IPT_TTL_H #define _IPT_TTL_H #include <linux/types.h> enum { IPT_TTL_SET = 0, IPT_TTL_INC, IPT_TTL_DEC }; #define IPT_TTL_MAXMODE IPT_TTL_DEC struct ipt_TTL_info { __u8 mode; __u8 ttl; }; #endif	375 B	2026-03-24 10:01
📄 ipt_ah.h /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note / #ifndef _IPT_AH_H #define _IPT_AH_H #include <linux/types.h> struct ipt_ah { __u32 spis[2]; / Security Parameter Index / __u8 invflags; / Inverse flags / }; / Values for "invflags" field in struct ipt_ah. / #define IPT_AH_INV_SPI 0x01 / Invert the sense of spi. / #define IPT_AH_INV_MASK 0x01 / All possible flags. / #endif /_IPT_AH_H*/	425 B	2026-03-24 10:01
📄 ipt_ecn.h /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note / #ifndef _IPT_ECN_H #define _IPT_ECN_H #include <linux/netfilter/xt_ecn.h> #define ipt_ecn_info xt_ecn_info enum { IPT_ECN_IP_MASK = XT_ECN_IP_MASK, IPT_ECN_OP_MATCH_IP = XT_ECN_OP_MATCH_IP, IPT_ECN_OP_MATCH_ECE = XT_ECN_OP_MATCH_ECE, IPT_ECN_OP_MATCH_CWR = XT_ECN_OP_MATCH_CWR, IPT_ECN_OP_MATCH_MASK = XT_ECN_OP_MATCH_MASK, }; #endif / IPT_ECN_H */	431 B	2026-03-24 10:01
📄 ipt_ttl.h /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note / / IP tables module for matching the value of the TTL * (C) 2000 by Harald Welte <laforge@gnumonks.org> / #ifndef _IPT_TTL_H #define _IPT_TTL_H #include <linux/types.h> enum { IPT_TTL_EQ = 0, / equals / IPT_TTL_NE, / not equals / IPT_TTL_LT, / less than / IPT_TTL_GT, / greater than */ }; struct ipt_ttl_info { __u8 mode; __u8 ttl; }; #endif	431 B	2026-03-24 10:01

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