2 * 25-Jul-1998 Major changes to allow for ip chain table
4 * 3-Jan-2000 Named tables to allow packet selection for different uses.
8 * Format of an IP firewall descriptor
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.
18 #include <linux/netfilter_ipv4.h>
20 #include <linux/netfilter/x_tables.h>
22 #define IPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
23 #define IPT_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
24 #define ipt_match xt_match
25 #define ipt_target xt_target
26 #define ipt_table xt_table
27 #define ipt_get_revision xt_get_revision
29 /* Yes, Virginia, you have to zero the padding. */
31 /* Source and destination IP addr */
32 struct in_addr src, dst;
33 /* Mask for src and dest IP addr */
34 struct in_addr smsk, dmsk;
35 char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
36 unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
38 /* Protocol, 0 = ANY */
47 #define ipt_entry_match xt_entry_match
48 #define ipt_entry_target xt_entry_target
49 #define ipt_standard_target xt_standard_target
51 #define ipt_counters xt_counters
53 /* Values for "flag" field in struct ipt_ip (general ip structure). */
54 #define IPT_F_FRAG 0x01 /* Set if rule is a fragment rule */
55 #define IPT_F_GOTO 0x02 /* Set if jump is a goto */
56 #define IPT_F_MASK 0x03 /* All possible flag bits mask. */
58 /* Values for "inv" field in struct ipt_ip. */
59 #define IPT_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */
60 #define IPT_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */
61 #define IPT_INV_TOS 0x04 /* Invert the sense of TOS. */
62 #define IPT_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */
63 #define IPT_INV_DSTIP 0x10 /* Invert the sense of DST OP. */
64 #define IPT_INV_FRAG 0x20 /* Invert the sense of FRAG. */
65 #define IPT_INV_PROTO XT_INV_PROTO
66 #define IPT_INV_MASK 0x7F /* All possible flag bits mask. */
68 /* This structure defines each of the firewall rules. Consists of 3
69 parts which are 1) general IP header stuff 2) match specific
70 stuff 3) the target to perform if the rule matches */
75 /* Mark with fields that we care about. */
78 /* Size of ipt_entry + matches */
79 u_int16_t target_offset;
80 /* Size of ipt_entry + matches + target */
81 u_int16_t next_offset;
84 unsigned int comefrom;
86 /* Packet and byte counters. */
87 struct xt_counters counters;
89 /* The matches (if any), then the target. */
90 unsigned char elems[0];
94 * New IP firewall options for [gs]etsockopt at the RAW IP level.
95 * Unlike BSD Linux inherits IP options so you don't have to use a raw
96 * socket for this. Instead we check rights in the calls.
98 * ATTENTION: check linux/in.h before adding new number here.
100 #define IPT_BASE_CTL 64
102 #define IPT_SO_SET_REPLACE (IPT_BASE_CTL)
103 #define IPT_SO_SET_ADD_COUNTERS (IPT_BASE_CTL + 1)
104 #define IPT_SO_SET_MAX IPT_SO_SET_ADD_COUNTERS
106 #define IPT_SO_GET_INFO (IPT_BASE_CTL)
107 #define IPT_SO_GET_ENTRIES (IPT_BASE_CTL + 1)
108 #define IPT_SO_GET_REVISION_MATCH (IPT_BASE_CTL + 2)
109 #define IPT_SO_GET_REVISION_TARGET (IPT_BASE_CTL + 3)
110 #define IPT_SO_GET_MAX IPT_SO_GET_REVISION_TARGET
112 #define IPT_CONTINUE XT_CONTINUE
113 #define IPT_RETURN XT_RETURN
115 #include <linux/netfilter/xt_tcpudp.h>
116 #define ipt_udp xt_udp
117 #define ipt_tcp xt_tcp
119 #define IPT_TCP_INV_SRCPT XT_TCP_INV_SRCPT
120 #define IPT_TCP_INV_DSTPT XT_TCP_INV_DSTPT
121 #define IPT_TCP_INV_FLAGS XT_TCP_INV_FLAGS
122 #define IPT_TCP_INV_OPTION XT_TCP_INV_OPTION
123 #define IPT_TCP_INV_MASK XT_TCP_INV_MASK
125 #define IPT_UDP_INV_SRCPT XT_UDP_INV_SRCPT
126 #define IPT_UDP_INV_DSTPT XT_UDP_INV_DSTPT
127 #define IPT_UDP_INV_MASK XT_UDP_INV_MASK
129 /* ICMP matching stuff */
132 u_int8_t type; /* type to match */
133 u_int8_t code[2]; /* range of code */
134 u_int8_t invflags; /* Inverse flags */
137 /* Values for "inv" field for struct ipt_icmp. */
138 #define IPT_ICMP_INV 0x01 /* Invert the sense of type/code test */
140 /* The argument to IPT_SO_GET_INFO */
143 /* Which table: caller fills this in. */
144 char name[IPT_TABLE_MAXNAMELEN];
146 /* Kernel fills these in. */
147 /* Which hook entry points are valid: bitmask */
148 unsigned int valid_hooks;
150 /* Hook entry points: one per netfilter hook. */
151 unsigned int hook_entry[NF_INET_NUMHOOKS];
153 /* Underflow points. */
154 unsigned int underflow[NF_INET_NUMHOOKS];
156 /* Number of entries */
157 unsigned int num_entries;
159 /* Size of entries. */
163 /* The argument to IPT_SO_SET_REPLACE. */
167 char name[IPT_TABLE_MAXNAMELEN];
169 /* Which hook entry points are valid: bitmask. You can't
171 unsigned int valid_hooks;
173 /* Number of entries */
174 unsigned int num_entries;
176 /* Total size of new entries */
179 /* Hook entry points. */
180 unsigned int hook_entry[NF_INET_NUMHOOKS];
182 /* Underflow points. */
183 unsigned int underflow[NF_INET_NUMHOOKS];
185 /* Information about old entries: */
186 /* Number of counters (must be equal to current number of entries). */
187 unsigned int num_counters;
188 /* The old entries' counters. */
189 struct xt_counters *counters;
191 /* The entries (hang off end: not really an array). */
192 struct ipt_entry entries[0];
195 /* The argument to IPT_SO_ADD_COUNTERS. */
196 #define ipt_counters_info xt_counters_info
198 /* The argument to IPT_SO_GET_ENTRIES. */
199 struct ipt_get_entries
201 /* Which table: user fills this in. */
202 char name[IPT_TABLE_MAXNAMELEN];
204 /* User fills this in: total entry size. */
208 struct ipt_entry entrytable[0];
211 /* Standard return verdict, or do jump. */
212 #define IPT_STANDARD_TARGET XT_STANDARD_TARGET
214 #define IPT_ERROR_TARGET XT_ERROR_TARGET
216 /* Helper functions */
217 static __inline__ struct ipt_entry_target *
218 ipt_get_target(struct ipt_entry *e)
220 return (void *)e + e->target_offset;
223 /* fn returns 0 to continue iteration */
224 #define IPT_MATCH_ITERATE(e, fn, args...) \
225 XT_MATCH_ITERATE(struct ipt_entry, e, fn, ## args)
227 /* fn returns 0 to continue iteration */
228 #define IPT_ENTRY_ITERATE(entries, size, fn, args...) \
229 XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
232 * Main firewall chains definitions and global var's definitions.
234 #endif /* _IPTABLES_H */