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Linux/include/uapi/linux/netfilter_ipv4/ip_tables.h

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  1 /*
  2  * 25-Jul-1998 Major changes to allow for ip chain table
  3  *
  4  * 3-Jan-2000 Named tables to allow packet selection for different uses.
  5  */
  6 
  7 /*
  8  *      Format of an IP firewall descriptor
  9  *
 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.
 13  */
 14 
 15 #ifndef _UAPI_IPTABLES_H
 16 #define _UAPI_IPTABLES_H
 17 
 18 #include <linux/types.h>
 19 #include <linux/compiler.h>
 20 #include <linux/if.h>
 21 #include <linux/netfilter_ipv4.h>
 22 
 23 #include <linux/netfilter/x_tables.h>
 24 
 25 #ifndef __KERNEL__
 26 #define IPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
 27 #define IPT_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
 28 #define ipt_match xt_match
 29 #define ipt_target xt_target
 30 #define ipt_table xt_table
 31 #define ipt_get_revision xt_get_revision
 32 #define ipt_entry_match xt_entry_match
 33 #define ipt_entry_target xt_entry_target
 34 #define ipt_standard_target xt_standard_target
 35 #define ipt_error_target xt_error_target
 36 #define ipt_counters xt_counters
 37 #define IPT_CONTINUE XT_CONTINUE
 38 #define IPT_RETURN XT_RETURN
 39 
 40 /* This group is older than old (iptables < v1.4.0-rc1~89) */
 41 #include <linux/netfilter/xt_tcpudp.h>
 42 #define ipt_udp xt_udp
 43 #define ipt_tcp xt_tcp
 44 #define IPT_TCP_INV_SRCPT       XT_TCP_INV_SRCPT
 45 #define IPT_TCP_INV_DSTPT       XT_TCP_INV_DSTPT
 46 #define IPT_TCP_INV_FLAGS       XT_TCP_INV_FLAGS
 47 #define IPT_TCP_INV_OPTION      XT_TCP_INV_OPTION
 48 #define IPT_TCP_INV_MASK        XT_TCP_INV_MASK
 49 #define IPT_UDP_INV_SRCPT       XT_UDP_INV_SRCPT
 50 #define IPT_UDP_INV_DSTPT       XT_UDP_INV_DSTPT
 51 #define IPT_UDP_INV_MASK        XT_UDP_INV_MASK
 52 
 53 /* The argument to IPT_SO_ADD_COUNTERS. */
 54 #define ipt_counters_info xt_counters_info
 55 /* Standard return verdict, or do jump. */
 56 #define IPT_STANDARD_TARGET XT_STANDARD_TARGET
 57 /* Error verdict. */
 58 #define IPT_ERROR_TARGET XT_ERROR_TARGET
 59 
 60 /* fn returns 0 to continue iteration */
 61 #define IPT_MATCH_ITERATE(e, fn, args...) \
 62         XT_MATCH_ITERATE(struct ipt_entry, e, fn, ## args)
 63 
 64 /* fn returns 0 to continue iteration */
 65 #define IPT_ENTRY_ITERATE(entries, size, fn, args...) \
 66         XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
 67 #endif
 68 
 69 /* Yes, Virginia, you have to zero the padding. */
 70 struct ipt_ip {
 71         /* Source and destination IP addr */
 72         struct in_addr src, dst;
 73         /* Mask for src and dest IP addr */
 74         struct in_addr smsk, dmsk;
 75         char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
 76         unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
 77 
 78         /* Protocol, 0 = ANY */
 79         __u16 proto;
 80 
 81         /* Flags word */
 82         __u8 flags;
 83         /* Inverse flags */
 84         __u8 invflags;
 85 };
 86 
 87 /* Values for "flag" field in struct ipt_ip (general ip structure). */
 88 #define IPT_F_FRAG              0x01    /* Set if rule is a fragment rule */
 89 #define IPT_F_GOTO              0x02    /* Set if jump is a goto */
 90 #define IPT_F_MASK              0x03    /* All possible flag bits mask. */
 91 
 92 /* Values for "inv" field in struct ipt_ip. */
 93 #define IPT_INV_VIA_IN          0x01    /* Invert the sense of IN IFACE. */
 94 #define IPT_INV_VIA_OUT         0x02    /* Invert the sense of OUT IFACE */
 95 #define IPT_INV_TOS             0x04    /* Invert the sense of TOS. */
 96 #define IPT_INV_SRCIP           0x08    /* Invert the sense of SRC IP. */
 97 #define IPT_INV_DSTIP           0x10    /* Invert the sense of DST OP. */
 98 #define IPT_INV_FRAG            0x20    /* Invert the sense of FRAG. */
 99 #define IPT_INV_PROTO           XT_INV_PROTO
100 #define IPT_INV_MASK            0x7F    /* All possible flag bits mask. */
101 
102 /* This structure defines each of the firewall rules.  Consists of 3
103    parts which are 1) general IP header stuff 2) match specific
104    stuff 3) the target to perform if the rule matches */
105 struct ipt_entry {
106         struct ipt_ip ip;
107 
108         /* Mark with fields that we care about. */
109         unsigned int nfcache;
110 
111         /* Size of ipt_entry + matches */
112         __u16 target_offset;
113         /* Size of ipt_entry + matches + target */
114         __u16 next_offset;
115 
116         /* Back pointer */
117         unsigned int comefrom;
118 
119         /* Packet and byte counters. */
120         struct xt_counters counters;
121 
122         /* The matches (if any), then the target. */
123         unsigned char elems[0];
124 };
125 
126 /*
127  * New IP firewall options for [gs]etsockopt at the RAW IP level.
128  * Unlike BSD Linux inherits IP options so you don't have to use a raw
129  * socket for this. Instead we check rights in the calls.
130  *
131  * ATTENTION: check linux/in.h before adding new number here.
132  */
133 #define IPT_BASE_CTL            64
134 
135 #define IPT_SO_SET_REPLACE      (IPT_BASE_CTL)
136 #define IPT_SO_SET_ADD_COUNTERS (IPT_BASE_CTL + 1)
137 #define IPT_SO_SET_MAX          IPT_SO_SET_ADD_COUNTERS
138 
139 #define IPT_SO_GET_INFO                 (IPT_BASE_CTL)
140 #define IPT_SO_GET_ENTRIES              (IPT_BASE_CTL + 1)
141 #define IPT_SO_GET_REVISION_MATCH       (IPT_BASE_CTL + 2)
142 #define IPT_SO_GET_REVISION_TARGET      (IPT_BASE_CTL + 3)
143 #define IPT_SO_GET_MAX                  IPT_SO_GET_REVISION_TARGET
144 
145 /* ICMP matching stuff */
146 struct ipt_icmp {
147         __u8 type;                              /* type to match */
148         __u8 code[2];                           /* range of code */
149         __u8 invflags;                          /* Inverse flags */
150 };
151 
152 /* Values for "inv" field for struct ipt_icmp. */
153 #define IPT_ICMP_INV    0x01    /* Invert the sense of type/code test */
154 
155 /* The argument to IPT_SO_GET_INFO */
156 struct ipt_getinfo {
157         /* Which table: caller fills this in. */
158         char name[XT_TABLE_MAXNAMELEN];
159 
160         /* Kernel fills these in. */
161         /* Which hook entry points are valid: bitmask */
162         unsigned int valid_hooks;
163 
164         /* Hook entry points: one per netfilter hook. */
165         unsigned int hook_entry[NF_INET_NUMHOOKS];
166 
167         /* Underflow points. */
168         unsigned int underflow[NF_INET_NUMHOOKS];
169 
170         /* Number of entries */
171         unsigned int num_entries;
172 
173         /* Size of entries. */
174         unsigned int size;
175 };
176 
177 /* The argument to IPT_SO_SET_REPLACE. */
178 struct ipt_replace {
179         /* Which table. */
180         char name[XT_TABLE_MAXNAMELEN];
181 
182         /* Which hook entry points are valid: bitmask.  You can't
183            change this. */
184         unsigned int valid_hooks;
185 
186         /* Number of entries */
187         unsigned int num_entries;
188 
189         /* Total size of new entries */
190         unsigned int size;
191 
192         /* Hook entry points. */
193         unsigned int hook_entry[NF_INET_NUMHOOKS];
194 
195         /* Underflow points. */
196         unsigned int underflow[NF_INET_NUMHOOKS];
197 
198         /* Information about old entries: */
199         /* Number of counters (must be equal to current number of entries). */
200         unsigned int num_counters;
201         /* The old entries' counters. */
202         struct xt_counters __user *counters;
203 
204         /* The entries (hang off end: not really an array). */
205         struct ipt_entry entries[0];
206 };
207 
208 /* The argument to IPT_SO_GET_ENTRIES. */
209 struct ipt_get_entries {
210         /* Which table: user fills this in. */
211         char name[XT_TABLE_MAXNAMELEN];
212 
213         /* User fills this in: total entry size. */
214         unsigned int size;
215 
216         /* The entries. */
217         struct ipt_entry entrytable[0];
218 };
219 
220 /* Helper functions */
221 static __inline__ struct xt_entry_target *
222 ipt_get_target(struct ipt_entry *e)
223 {
224         return (void *)e + e->target_offset;
225 }
226 
227 /*
228  *      Main firewall chains definitions and global var's definitions.
229  */
230 #endif /* _UAPI_IPTABLES_H */
231 

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