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

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  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 IP 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 _UAPI_IPTABLES_H
 17 #define _UAPI_IPTABLES_H
 18 
 19 #include <linux/types.h>
 20 #include <linux/compiler.h>
 21 #include <linux/if.h>
 22 #include <linux/netfilter_ipv4.h>
 23 
 24 #include <linux/netfilter/x_tables.h>
 25 
 26 #ifndef __KERNEL__
 27 #define IPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
 28 #define IPT_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
 29 #define ipt_match xt_match
 30 #define ipt_target xt_target
 31 #define ipt_table xt_table
 32 #define ipt_get_revision xt_get_revision
 33 #define ipt_entry_match xt_entry_match
 34 #define ipt_entry_target xt_entry_target
 35 #define ipt_standard_target xt_standard_target
 36 #define ipt_error_target xt_error_target
 37 #define ipt_counters xt_counters
 38 #define IPT_CONTINUE XT_CONTINUE
 39 #define IPT_RETURN XT_RETURN
 40 
 41 /* This group is older than old (iptables < v1.4.0-rc1~89) */
 42 #include <linux/netfilter/xt_tcpudp.h>
 43 #define ipt_udp xt_udp
 44 #define ipt_tcp xt_tcp
 45 #define IPT_TCP_INV_SRCPT       XT_TCP_INV_SRCPT
 46 #define IPT_TCP_INV_DSTPT       XT_TCP_INV_DSTPT
 47 #define IPT_TCP_INV_FLAGS       XT_TCP_INV_FLAGS
 48 #define IPT_TCP_INV_OPTION      XT_TCP_INV_OPTION
 49 #define IPT_TCP_INV_MASK        XT_TCP_INV_MASK
 50 #define IPT_UDP_INV_SRCPT       XT_UDP_INV_SRCPT
 51 #define IPT_UDP_INV_DSTPT       XT_UDP_INV_DSTPT
 52 #define IPT_UDP_INV_MASK        XT_UDP_INV_MASK
 53 
 54 /* The argument to IPT_SO_ADD_COUNTERS. */
 55 #define ipt_counters_info xt_counters_info
 56 /* Standard return verdict, or do jump. */
 57 #define IPT_STANDARD_TARGET XT_STANDARD_TARGET
 58 /* Error verdict. */
 59 #define IPT_ERROR_TARGET XT_ERROR_TARGET
 60 
 61 /* fn returns 0 to continue iteration */
 62 #define IPT_MATCH_ITERATE(e, fn, args...) \
 63         XT_MATCH_ITERATE(struct ipt_entry, e, fn, ## args)
 64 
 65 /* fn returns 0 to continue iteration */
 66 #define IPT_ENTRY_ITERATE(entries, size, fn, args...) \
 67         XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
 68 #endif
 69 
 70 /* Yes, Virginia, you have to zero the padding. */
 71 struct ipt_ip {
 72         /* Source and destination IP addr */
 73         struct in_addr src, dst;
 74         /* Mask for src and dest IP addr */
 75         struct in_addr smsk, dmsk;
 76         char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
 77         unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
 78 
 79         /* Protocol, 0 = ANY */
 80         __u16 proto;
 81 
 82         /* Flags word */
 83         __u8 flags;
 84         /* Inverse flags */
 85         __u8 invflags;
 86 };
 87 
 88 /* Values for "flag" field in struct ipt_ip (general ip structure). */
 89 #define IPT_F_FRAG              0x01    /* Set if rule is a fragment rule */
 90 #define IPT_F_GOTO              0x02    /* Set if jump is a goto */
 91 #define IPT_F_MASK              0x03    /* All possible flag bits mask. */
 92 
 93 /* Values for "inv" field in struct ipt_ip. */
 94 #define IPT_INV_VIA_IN          0x01    /* Invert the sense of IN IFACE. */
 95 #define IPT_INV_VIA_OUT         0x02    /* Invert the sense of OUT IFACE */
 96 #define IPT_INV_TOS             0x04    /* Invert the sense of TOS. */
 97 #define IPT_INV_SRCIP           0x08    /* Invert the sense of SRC IP. */
 98 #define IPT_INV_DSTIP           0x10    /* Invert the sense of DST OP. */
 99 #define IPT_INV_FRAG            0x20    /* Invert the sense of FRAG. */
100 #define IPT_INV_PROTO           XT_INV_PROTO
101 #define IPT_INV_MASK            0x7F    /* All possible flag bits mask. */
102 
103 /* This structure defines each of the firewall rules.  Consists of 3
104    parts which are 1) general IP header stuff 2) match specific
105    stuff 3) the target to perform if the rule matches */
106 struct ipt_entry {
107         struct ipt_ip ip;
108 
109         /* Mark with fields that we care about. */
110         unsigned int nfcache;
111 
112         /* Size of ipt_entry + matches */
113         __u16 target_offset;
114         /* Size of ipt_entry + matches + target */
115         __u16 next_offset;
116 
117         /* Back pointer */
118         unsigned int comefrom;
119 
120         /* Packet and byte counters. */
121         struct xt_counters counters;
122 
123         /* The matches (if any), then the target. */
124         unsigned char elems[0];
125 };
126 
127 /*
128  * New IP firewall options for [gs]etsockopt at the RAW IP level.
129  * Unlike BSD Linux inherits IP options so you don't have to use a raw
130  * socket for this. Instead we check rights in the calls.
131  *
132  * ATTENTION: check linux/in.h before adding new number here.
133  */
134 #define IPT_BASE_CTL            64
135 
136 #define IPT_SO_SET_REPLACE      (IPT_BASE_CTL)
137 #define IPT_SO_SET_ADD_COUNTERS (IPT_BASE_CTL + 1)
138 #define IPT_SO_SET_MAX          IPT_SO_SET_ADD_COUNTERS
139 
140 #define IPT_SO_GET_INFO                 (IPT_BASE_CTL)
141 #define IPT_SO_GET_ENTRIES              (IPT_BASE_CTL + 1)
142 #define IPT_SO_GET_REVISION_MATCH       (IPT_BASE_CTL + 2)
143 #define IPT_SO_GET_REVISION_TARGET      (IPT_BASE_CTL + 3)
144 #define IPT_SO_GET_MAX                  IPT_SO_GET_REVISION_TARGET
145 
146 /* ICMP matching stuff */
147 struct ipt_icmp {
148         __u8 type;                              /* type to match */
149         __u8 code[2];                           /* range of code */
150         __u8 invflags;                          /* Inverse flags */
151 };
152 
153 /* Values for "inv" field for struct ipt_icmp. */
154 #define IPT_ICMP_INV    0x01    /* Invert the sense of type/code test */
155 
156 /* The argument to IPT_SO_GET_INFO */
157 struct ipt_getinfo {
158         /* Which table: caller fills this in. */
159         char name[XT_TABLE_MAXNAMELEN];
160 
161         /* Kernel fills these in. */
162         /* Which hook entry points are valid: bitmask */
163         unsigned int valid_hooks;
164 
165         /* Hook entry points: one per netfilter hook. */
166         unsigned int hook_entry[NF_INET_NUMHOOKS];
167 
168         /* Underflow points. */
169         unsigned int underflow[NF_INET_NUMHOOKS];
170 
171         /* Number of entries */
172         unsigned int num_entries;
173 
174         /* Size of entries. */
175         unsigned int size;
176 };
177 
178 /* The argument to IPT_SO_SET_REPLACE. */
179 struct ipt_replace {
180         /* Which table. */
181         char name[XT_TABLE_MAXNAMELEN];
182 
183         /* Which hook entry points are valid: bitmask.  You can't
184            change this. */
185         unsigned int valid_hooks;
186 
187         /* Number of entries */
188         unsigned int num_entries;
189 
190         /* Total size of new entries */
191         unsigned int size;
192 
193         /* Hook entry points. */
194         unsigned int hook_entry[NF_INET_NUMHOOKS];
195 
196         /* Underflow points. */
197         unsigned int underflow[NF_INET_NUMHOOKS];
198 
199         /* Information about old entries: */
200         /* Number of counters (must be equal to current number of entries). */
201         unsigned int num_counters;
202         /* The old entries' counters. */
203         struct xt_counters __user *counters;
204 
205         /* The entries (hang off end: not really an array). */
206         struct ipt_entry entries[0];
207 };
208 
209 /* The argument to IPT_SO_GET_ENTRIES. */
210 struct ipt_get_entries {
211         /* Which table: user fills this in. */
212         char name[XT_TABLE_MAXNAMELEN];
213 
214         /* User fills this in: total entry size. */
215         unsigned int size;
216 
217         /* The entries. */
218         struct ipt_entry entrytable[0];
219 };
220 
221 /* Helper functions */
222 static __inline__ struct xt_entry_target *
223 ipt_get_target(struct ipt_entry *e)
224 {
225         return (void *)e + e->target_offset;
226 }
227 
228 /*
229  *      Main firewall chains definitions and global var's definitions.
230  */
231 #endif /* _UAPI_IPTABLES_H */
232 

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