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 IP6 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_ipv6.h>
20 #include <linux/netfilter/x_tables.h>
22 #define IP6T_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
23 #define IP6T_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
25 #define ip6t_match xt_match
26 #define ip6t_target xt_target
27 #define ip6t_table xt_table
28 #define ip6t_get_revision xt_get_revision
30 /* Yes, Virginia, you have to zero the padding. */
32 /* Source and destination IP6 addr */
33 struct in6_addr src, dst;
34 /* Mask for src and dest IP6 addr */
35 struct in6_addr smsk, dmsk;
36 char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
37 unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
39 /* Upper protocol number
40 * - The allowed value is 0 (any) or protocol number of last parsable
41 * header, which is 50 (ESP), 59 (No Next Header), 135 (MH), or
42 * the non IPv6 extension headers.
43 * - The protocol numbers of IPv6 extension headers except of ESP and
44 * MH do not match any packets.
45 * - You also need to set IP6T_FLAGS_PROTO to "flags" to check protocol.
48 /* TOS to match iff flags & IP6T_F_TOS */
57 #define ip6t_entry_match xt_entry_match
58 #define ip6t_entry_target xt_entry_target
59 #define ip6t_standard_target xt_standard_target
61 #define ip6t_counters xt_counters
63 /* Values for "flag" field in struct ip6t_ip6 (general ip6 structure). */
64 #define IP6T_F_PROTO 0x01 /* Set if rule cares about upper
66 #define IP6T_F_TOS 0x02 /* Match the TOS. */
67 #define IP6T_F_GOTO 0x04 /* Set if jump is a goto */
68 #define IP6T_F_MASK 0x07 /* All possible flag bits mask. */
70 /* Values for "inv" field in struct ip6t_ip6. */
71 #define IP6T_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */
72 #define IP6T_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */
73 #define IP6T_INV_TOS 0x04 /* Invert the sense of TOS. */
74 #define IP6T_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */
75 #define IP6T_INV_DSTIP 0x10 /* Invert the sense of DST OP. */
76 #define IP6T_INV_FRAG 0x20 /* Invert the sense of FRAG. */
77 #define IP6T_INV_PROTO XT_INV_PROTO
78 #define IP6T_INV_MASK 0x7F /* All possible flag bits mask. */
80 /* This structure defines each of the firewall rules. Consists of 3
81 parts which are 1) general IP header stuff 2) match specific
82 stuff 3) the target to perform if the rule matches */
87 /* Mark with fields that we care about. */
90 /* Size of ipt_entry + matches */
91 u_int16_t target_offset;
92 /* Size of ipt_entry + matches + target */
93 u_int16_t next_offset;
96 unsigned int comefrom;
98 /* Packet and byte counters. */
99 struct xt_counters counters;
101 /* The matches (if any), then the target. */
102 unsigned char elems[0];
108 struct ip6t_entry entry;
109 struct ip6t_standard_target target;
112 struct ip6t_error_target
114 struct ip6t_entry_target target;
115 char errorname[IP6T_FUNCTION_MAXNAMELEN];
120 struct ip6t_entry entry;
121 struct ip6t_error_target target;
124 #define IP6T_ENTRY_INIT(__size) \
126 .target_offset = sizeof(struct ip6t_entry), \
127 .next_offset = (__size), \
130 #define IP6T_STANDARD_INIT(__verdict) \
132 .entry = IP6T_ENTRY_INIT(sizeof(struct ip6t_standard)), \
133 .target = XT_TARGET_INIT(IP6T_STANDARD_TARGET, \
134 sizeof(struct ip6t_standard_target)), \
135 .target.verdict = -(__verdict) - 1, \
138 #define IP6T_ERROR_INIT \
140 .entry = IP6T_ENTRY_INIT(sizeof(struct ip6t_error)), \
141 .target = XT_TARGET_INIT(IP6T_ERROR_TARGET, \
142 sizeof(struct ip6t_error_target)), \
143 .target.errorname = "ERROR", \
147 * New IP firewall options for [gs]etsockopt at the RAW IP level.
148 * Unlike BSD Linux inherits IP options so you don't have to use
149 * a raw socket for this. Instead we check rights in the calls.
151 * ATTENTION: check linux/in6.h before adding new number here.
153 #define IP6T_BASE_CTL 64
155 #define IP6T_SO_SET_REPLACE (IP6T_BASE_CTL)
156 #define IP6T_SO_SET_ADD_COUNTERS (IP6T_BASE_CTL + 1)
157 #define IP6T_SO_SET_MAX IP6T_SO_SET_ADD_COUNTERS
159 #define IP6T_SO_GET_INFO (IP6T_BASE_CTL)
160 #define IP6T_SO_GET_ENTRIES (IP6T_BASE_CTL + 1)
161 #define IP6T_SO_GET_REVISION_MATCH (IP6T_BASE_CTL + 4)
162 #define IP6T_SO_GET_REVISION_TARGET (IP6T_BASE_CTL + 5)
163 #define IP6T_SO_GET_MAX IP6T_SO_GET_REVISION_TARGET
165 /* CONTINUE verdict for targets */
166 #define IP6T_CONTINUE XT_CONTINUE
168 /* For standard target */
169 #define IP6T_RETURN XT_RETURN
171 /* TCP/UDP matching stuff */
172 #include <linux/netfilter/xt_tcpudp.h>
174 #define ip6t_tcp xt_tcp
175 #define ip6t_udp xt_udp
177 /* Values for "inv" field in struct ipt_tcp. */
178 #define IP6T_TCP_INV_SRCPT XT_TCP_INV_SRCPT
179 #define IP6T_TCP_INV_DSTPT XT_TCP_INV_DSTPT
180 #define IP6T_TCP_INV_FLAGS XT_TCP_INV_FLAGS
181 #define IP6T_TCP_INV_OPTION XT_TCP_INV_OPTION
182 #define IP6T_TCP_INV_MASK XT_TCP_INV_MASK
184 /* Values for "invflags" field in struct ipt_udp. */
185 #define IP6T_UDP_INV_SRCPT XT_UDP_INV_SRCPT
186 #define IP6T_UDP_INV_DSTPT XT_UDP_INV_DSTPT
187 #define IP6T_UDP_INV_MASK XT_UDP_INV_MASK
189 /* ICMP matching stuff */
192 u_int8_t type; /* type to match */
193 u_int8_t code[2]; /* range of code */
194 u_int8_t invflags; /* Inverse flags */
197 /* Values for "inv" field for struct ipt_icmp. */
198 #define IP6T_ICMP_INV 0x01 /* Invert the sense of type/code test */
200 /* The argument to IP6T_SO_GET_INFO */
203 /* Which table: caller fills this in. */
204 char name[IP6T_TABLE_MAXNAMELEN];
206 /* Kernel fills these in. */
207 /* Which hook entry points are valid: bitmask */
208 unsigned int valid_hooks;
210 /* Hook entry points: one per netfilter hook. */
211 unsigned int hook_entry[NF_INET_NUMHOOKS];
213 /* Underflow points. */
214 unsigned int underflow[NF_INET_NUMHOOKS];
216 /* Number of entries */
217 unsigned int num_entries;
219 /* Size of entries. */
223 /* The argument to IP6T_SO_SET_REPLACE. */
227 char name[IP6T_TABLE_MAXNAMELEN];
229 /* Which hook entry points are valid: bitmask. You can't
231 unsigned int valid_hooks;
233 /* Number of entries */
234 unsigned int num_entries;
236 /* Total size of new entries */
239 /* Hook entry points. */
240 unsigned int hook_entry[NF_INET_NUMHOOKS];
242 /* Underflow points. */
243 unsigned int underflow[NF_INET_NUMHOOKS];
245 /* Information about old entries: */
246 /* Number of counters (must be equal to current number of entries). */
247 unsigned int num_counters;
248 /* The old entries' counters. */
249 struct xt_counters *counters;
251 /* The entries (hang off end: not really an array). */
252 struct ip6t_entry entries[0];
255 /* The argument to IP6T_SO_ADD_COUNTERS. */
256 #define ip6t_counters_info xt_counters_info
258 /* The argument to IP6T_SO_GET_ENTRIES. */
259 struct ip6t_get_entries
261 /* Which table: user fills this in. */
262 char name[IP6T_TABLE_MAXNAMELEN];
264 /* User fills this in: total entry size. */
268 struct ip6t_entry entrytable[0];
271 /* Standard return verdict, or do jump. */
272 #define IP6T_STANDARD_TARGET XT_STANDARD_TARGET
274 #define IP6T_ERROR_TARGET XT_ERROR_TARGET
276 /* Helper functions */
277 static __inline__ struct ip6t_entry_target *
278 ip6t_get_target(struct ip6t_entry *e)
280 return (void *)e + e->target_offset;
283 /* fn returns 0 to continue iteration */
284 #define IP6T_MATCH_ITERATE(e, fn, args...) \
285 XT_MATCH_ITERATE(struct ip6t_entry, e, fn, ## args)
287 /* fn returns 0 to continue iteration */
288 #define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \
289 XT_ENTRY_ITERATE(struct ip6t_entry, entries, size, fn, ## args)
292 * Main firewall chains definitions and global var's definitions.
295 #endif /* _IP6_TABLES_H */