---

---

---

001: /*
002:  * 25-Jul-1998 Major changes to allow for ip chain table
003:  *
004:  * 3-Jan-2000 Named tables to allow packet selection for different uses.
005:  */
006: 
007: /*
008:  *      Format of an IP firewall descriptor
009:  *
010:  *      src, dst, src_mask, dst_mask are always stored in network byte order.
011:  *      flags are stored in host byte order (of course).
012:  *      Port numbers are stored in HOST byte order.
013:  */
014: 
015: #ifndef _IPTABLES_H
016: #define _IPTABLES_H
017: 
018: #include <linux/types.h>
019: 
020: #include <linux/netfilter_ipv4.h>
021: 
022: #include <linux/netfilter/x_tables.h>
023: 
024: #define IPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
025: #define IPT_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
026: #define ipt_match xt_match
027: #define ipt_target xt_target
028: #define ipt_table xt_table
029: #define ipt_get_revision xt_get_revision
030: #define ipt_entry_match xt_entry_match
031: #define ipt_entry_target xt_entry_target
032: #define ipt_standard_target xt_standard_target
033: #define ipt_error_target xt_error_target
034: #define ipt_counters xt_counters
035: #define IPT_CONTINUE XT_CONTINUE
036: #define IPT_RETURN XT_RETURN
037: 
038: /* This group is older than old (iptables < v1.4.0-rc1~89) */
039: #include <linux/netfilter/xt_tcpudp.h>
040: #define ipt_udp xt_udp
041: #define ipt_tcp xt_tcp
042: #define IPT_TCP_INV_SRCPT       XT_TCP_INV_SRCPT
043: #define IPT_TCP_INV_DSTPT       XT_TCP_INV_DSTPT
044: #define IPT_TCP_INV_FLAGS       XT_TCP_INV_FLAGS
045: #define IPT_TCP_INV_OPTION      XT_TCP_INV_OPTION
046: #define IPT_TCP_INV_MASK        XT_TCP_INV_MASK
047: #define IPT_UDP_INV_SRCPT       XT_UDP_INV_SRCPT
048: #define IPT_UDP_INV_DSTPT       XT_UDP_INV_DSTPT
049: #define IPT_UDP_INV_MASK        XT_UDP_INV_MASK
050: 
051: /* The argument to IPT_SO_ADD_COUNTERS. */
052: #define ipt_counters_info xt_counters_info
053: /* Standard return verdict, or do jump. */
054: #define IPT_STANDARD_TARGET XT_STANDARD_TARGET
055: /* Error verdict. */
056: #define IPT_ERROR_TARGET XT_ERROR_TARGET
057: 
058: /* fn returns 0 to continue iteration */
059: #define IPT_MATCH_ITERATE(e, fn, args...) \
060:         XT_MATCH_ITERATE(struct ipt_entry, e, fn, ## args)
061: 
062: /* fn returns 0 to continue iteration */
063: #define IPT_ENTRY_ITERATE(entries, size, fn, args...) \
064:         XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
065: 
066: /* Yes, Virginia, you have to zero the padding. */
067: struct ipt_ip {
068:         /* Source and destination IP addr */
069:         struct in_addr src, dst;
070:         /* Mask for src and dest IP addr */
071:         struct in_addr smsk, dmsk;
072:         char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
073:         unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
074: 
075:         /* Protocol, 0 = ANY */
076:         __u16 proto;
077: 
078:         /* Flags word */
079:         __u8 flags;
080:         /* Inverse flags */
081:         __u8 invflags;
082: };
083: 
084: /* Values for "flag" field in struct ipt_ip (general ip structure). */
085: #define IPT_F_FRAG              0x01    /* Set if rule is a fragment rule */
086: #define IPT_F_GOTO              0x02    /* Set if jump is a goto */
087: #define IPT_F_MASK              0x03    /* All possible flag bits mask. */
088: 
089: /* Values for "inv" field in struct ipt_ip. */
090: #define IPT_INV_VIA_IN          0x01    /* Invert the sense of IN IFACE. */
091: #define IPT_INV_VIA_OUT         0x02    /* Invert the sense of OUT IFACE */
092: #define IPT_INV_TOS             0x04    /* Invert the sense of TOS. */
093: #define IPT_INV_SRCIP           0x08    /* Invert the sense of SRC IP. */
094: #define IPT_INV_DSTIP           0x10    /* Invert the sense of DST OP. */
095: #define IPT_INV_FRAG            0x20    /* Invert the sense of FRAG. */
096: #define IPT_INV_PROTO           XT_INV_PROTO
097: #define IPT_INV_MASK            0x7F    /* All possible flag bits mask. */
098: 
099: /* This structure defines each of the firewall rules.  Consists of 3
100:    parts which are 1) general IP header stuff 2) match specific
101:    stuff 3) the target to perform if the rule matches */
102: struct ipt_entry {
103:         struct ipt_ip ip;
104: 
105:         /* Mark with fields that we care about. */
106:         unsigned int nfcache;
107: 
108:         /* Size of ipt_entry + matches */
109:         __u16 target_offset;
110:         /* Size of ipt_entry + matches + target */
111:         __u16 next_offset;
112: 
113:         /* Back pointer */
114:         unsigned int comefrom;
115: 
116:         /* Packet and byte counters. */
117:         struct xt_counters counters;
118: 
119:         /* The matches (if any), then the target. */
120:         unsigned char elems[0];
121: };
122: 
123: /*
124:  * New IP firewall options for [gs]etsockopt at the RAW IP level.
125:  * Unlike BSD Linux inherits IP options so you don't have to use a raw
126:  * socket for this. Instead we check rights in the calls.
127:  *
128:  * ATTENTION: check linux/in.h before adding new number here.
129:  */
130: #define IPT_BASE_CTL            64
131: 
132: #define IPT_SO_SET_REPLACE      (IPT_BASE_CTL)
133: #define IPT_SO_SET_ADD_COUNTERS (IPT_BASE_CTL + 1)
134: #define IPT_SO_SET_MAX          IPT_SO_SET_ADD_COUNTERS
135: 
136: #define IPT_SO_GET_INFO                 (IPT_BASE_CTL)
137: #define IPT_SO_GET_ENTRIES              (IPT_BASE_CTL + 1)
138: #define IPT_SO_GET_REVISION_MATCH       (IPT_BASE_CTL + 2)
139: #define IPT_SO_GET_REVISION_TARGET      (IPT_BASE_CTL + 3)
140: #define IPT_SO_GET_MAX                  IPT_SO_GET_REVISION_TARGET
141: 
142: /* ICMP matching stuff */
143: struct ipt_icmp {
144:         __u8 type;                              /* type to match */
145:         __u8 code[2];                           /* range of code */
146:         __u8 invflags;                          /* Inverse flags */
147: };
148: 
149: /* Values for "inv" field for struct ipt_icmp. */
150: #define IPT_ICMP_INV    0x01    /* Invert the sense of type/code test */
151: 
152: /* The argument to IPT_SO_GET_INFO */
153: struct ipt_getinfo {
154:         /* Which table: caller fills this in. */
155:         char name[XT_TABLE_MAXNAMELEN];
156: 
157:         /* Kernel fills these in. */
158:         /* Which hook entry points are valid: bitmask */
159:         unsigned int valid_hooks;
160: 
161:         /* Hook entry points: one per netfilter hook. */
162:         unsigned int hook_entry[NF_INET_NUMHOOKS];
163: 
164:         /* Underflow points. */
165:         unsigned int underflow[NF_INET_NUMHOOKS];
166: 
167:         /* Number of entries */
168:         unsigned int num_entries;
169: 
170:         /* Size of entries. */
171:         unsigned int size;
172: };
173: 
174: /* The argument to IPT_SO_SET_REPLACE. */
175: struct ipt_replace {
176:         /* Which table. */
177:         char name[XT_TABLE_MAXNAMELEN];
178: 
179:         /* Which hook entry points are valid: bitmask.  You can't
180:            change this. */
181:         unsigned int valid_hooks;
182: 
183:         /* Number of entries */
184:         unsigned int num_entries;
185: 
186:         /* Total size of new entries */
187:         unsigned int size;
188: 
189:         /* Hook entry points. */
190:         unsigned int hook_entry[NF_INET_NUMHOOKS];
191: 
192:         /* Underflow points. */
193:         unsigned int underflow[NF_INET_NUMHOOKS];
194: 
195:         /* Information about old entries: */
196:         /* Number of counters (must be equal to current number of entries). */
197:         unsigned int num_counters;
198:         /* The old entries' counters. */
199:         struct xt_counters *counters;
200: 
201:         /* The entries (hang off end: not really an array). */
202:         struct ipt_entry entries[0];
203: };
204: 
205: /* The argument to IPT_SO_GET_ENTRIES. */
206: struct ipt_get_entries {
207:         /* Which table: user fills this in. */
208:         char name[XT_TABLE_MAXNAMELEN];
209: 
210:         /* User fills this in: total entry size. */
211:         unsigned int size;
212: 
213:         /* The entries. */
214:         struct ipt_entry entrytable[0];
215: };
216: 
217: /* Helper functions */
218: static __inline__ struct xt_entry_target *
219: ipt_get_target(struct ipt_entry *e)
220: {
221:         return (void *)e + e->target_offset;
222: }
223: 
224: /*
225:  *      Main firewall chains definitions and global var's definitions.
226:  */
227: #endif /* _IPTABLES_H */
228: 

---

---

---