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.
20 #include <linux/types.h>
21 #include <linux/in6.h>
22 #include <linux/ipv6.h>
23 #include <linux/skbuff.h>
25 #include <linux/compiler.h>
26 #include <linux/netfilter_ipv6.h>
28 #include <linux/netfilter/x_tables.h>
30 #define IP6T_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
31 #define IP6T_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
33 #define ip6t_match xt_match
34 #define ip6t_target xt_target
35 #define ip6t_table xt_table
36 #define ip6t_get_revision xt_get_revision
38 /* Yes, Virginia, you have to zero the padding. */
40 /* Source and destination IP6 addr */
41 struct in6_addr src
, dst
;
42 /* Mask for src and dest IP6 addr */
43 struct in6_addr smsk
, dmsk
;
44 char iniface
[IFNAMSIZ
], outiface
[IFNAMSIZ
];
45 unsigned char iniface_mask
[IFNAMSIZ
], outiface_mask
[IFNAMSIZ
];
47 /* ARGH, HopByHop uses 0, so can't do 0 = ANY,
48 instead IP6T_F_NOPROTO must be set */
50 /* TOS to match iff flags & IP6T_F_TOS */
59 #define ip6t_entry_match xt_entry_match
60 #define ip6t_entry_target xt_entry_target
61 #define ip6t_standard_target xt_standard_target
63 #define ip6t_counters xt_counters
65 /* Values for "flag" field in struct ip6t_ip6 (general ip6 structure). */
66 #define IP6T_F_PROTO 0x01 /* Set if rule cares about upper
68 #define IP6T_F_TOS 0x02 /* Match the TOS. */
69 #define IP6T_F_GOTO 0x04 /* Set if jump is a goto */
70 #define IP6T_F_MASK 0x07 /* All possible flag bits mask. */
72 /* Values for "inv" field in struct ip6t_ip6. */
73 #define IP6T_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */
74 #define IP6T_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */
75 #define IP6T_INV_TOS 0x04 /* Invert the sense of TOS. */
76 #define IP6T_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */
77 #define IP6T_INV_DSTIP 0x10 /* Invert the sense of DST OP. */
78 #define IP6T_INV_FRAG 0x20 /* Invert the sense of FRAG. */
79 #define IP6T_INV_PROTO XT_INV_PROTO
80 #define IP6T_INV_MASK 0x7F /* All possible flag bits mask. */
82 /* This structure defines each of the firewall rules. Consists of 3
83 parts which are 1) general IP header stuff 2) match specific
84 stuff 3) the target to perform if the rule matches */
89 /* Mark with fields that we care about. */
92 /* Size of ipt_entry + matches */
93 u_int16_t target_offset
;
94 /* Size of ipt_entry + matches + target */
95 u_int16_t next_offset
;
98 unsigned int comefrom
;
100 /* Packet and byte counters. */
101 struct xt_counters counters
;
103 /* The matches (if any), then the target. */
104 unsigned char elems
[0];
110 struct ip6t_entry entry
;
111 struct ip6t_standard_target target
;
114 struct ip6t_error_target
116 struct ip6t_entry_target target
;
117 char errorname
[IP6T_FUNCTION_MAXNAMELEN
];
122 struct ip6t_entry entry
;
123 struct ip6t_error_target target
;
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
129 * a raw socket for this. Instead we check rights in the calls.
131 * ATTENTION: check linux/in6.h before adding new number here.
133 #define IP6T_BASE_CTL 64
135 #define IP6T_SO_SET_REPLACE (IP6T_BASE_CTL)
136 #define IP6T_SO_SET_ADD_COUNTERS (IP6T_BASE_CTL + 1)
137 #define IP6T_SO_SET_MAX IP6T_SO_SET_ADD_COUNTERS
139 #define IP6T_SO_GET_INFO (IP6T_BASE_CTL)
140 #define IP6T_SO_GET_ENTRIES (IP6T_BASE_CTL + 1)
141 #define IP6T_SO_GET_REVISION_MATCH (IP6T_BASE_CTL + 4)
142 #define IP6T_SO_GET_REVISION_TARGET (IP6T_BASE_CTL + 5)
143 #define IP6T_SO_GET_MAX IP6T_SO_GET_REVISION_TARGET
145 /* CONTINUE verdict for targets */
146 #define IP6T_CONTINUE XT_CONTINUE
148 /* For standard target */
149 #define IP6T_RETURN XT_RETURN
151 /* TCP/UDP matching stuff */
152 #include <linux/netfilter/xt_tcpudp.h>
154 #define ip6t_tcp xt_tcp
155 #define ip6t_udp xt_udp
157 /* Values for "inv" field in struct ipt_tcp. */
158 #define IP6T_TCP_INV_SRCPT XT_TCP_INV_SRCPT
159 #define IP6T_TCP_INV_DSTPT XT_TCP_INV_DSTPT
160 #define IP6T_TCP_INV_FLAGS XT_TCP_INV_FLAGS
161 #define IP6T_TCP_INV_OPTION XT_TCP_INV_OPTION
162 #define IP6T_TCP_INV_MASK XT_TCP_INV_MASK
164 /* Values for "invflags" field in struct ipt_udp. */
165 #define IP6T_UDP_INV_SRCPT XT_UDP_INV_SRCPT
166 #define IP6T_UDP_INV_DSTPT XT_UDP_INV_DSTPT
167 #define IP6T_UDP_INV_MASK XT_UDP_INV_MASK
169 /* ICMP matching stuff */
172 u_int8_t type
; /* type to match */
173 u_int8_t code
[2]; /* range of code */
174 u_int8_t invflags
; /* Inverse flags */
177 /* Values for "inv" field for struct ipt_icmp. */
178 #define IP6T_ICMP_INV 0x01 /* Invert the sense of type/code test */
180 /* The argument to IP6T_SO_GET_INFO */
183 /* Which table: caller fills this in. */
184 char name
[IP6T_TABLE_MAXNAMELEN
];
186 /* Kernel fills these in. */
187 /* Which hook entry points are valid: bitmask */
188 unsigned int valid_hooks
;
190 /* Hook entry points: one per netfilter hook. */
191 unsigned int hook_entry
[NF_IP6_NUMHOOKS
];
193 /* Underflow points. */
194 unsigned int underflow
[NF_IP6_NUMHOOKS
];
196 /* Number of entries */
197 unsigned int num_entries
;
199 /* Size of entries. */
203 /* The argument to IP6T_SO_SET_REPLACE. */
207 char name
[IP6T_TABLE_MAXNAMELEN
];
209 /* Which hook entry points are valid: bitmask. You can't
211 unsigned int valid_hooks
;
213 /* Number of entries */
214 unsigned int num_entries
;
216 /* Total size of new entries */
219 /* Hook entry points. */
220 unsigned int hook_entry
[NF_IP6_NUMHOOKS
];
222 /* Underflow points. */
223 unsigned int underflow
[NF_IP6_NUMHOOKS
];
225 /* Information about old entries: */
226 /* Number of counters (must be equal to current number of entries). */
227 unsigned int num_counters
;
228 /* The old entries' counters. */
229 struct xt_counters __user
*counters
;
231 /* The entries (hang off end: not really an array). */
232 struct ip6t_entry entries
[0];
235 /* The argument to IP6T_SO_ADD_COUNTERS. */
236 #define ip6t_counters_info xt_counters_info
238 /* The argument to IP6T_SO_GET_ENTRIES. */
239 struct ip6t_get_entries
241 /* Which table: user fills this in. */
242 char name
[IP6T_TABLE_MAXNAMELEN
];
244 /* User fills this in: total entry size. */
248 struct ip6t_entry entrytable
[0];
251 /* Standard return verdict, or do jump. */
252 #define IP6T_STANDARD_TARGET XT_STANDARD_TARGET
254 #define IP6T_ERROR_TARGET XT_ERROR_TARGET
256 /* Helper functions */
257 static __inline__
struct ip6t_entry_target
*
258 ip6t_get_target(struct ip6t_entry
*e
)
260 return (void *)e
+ e
->target_offset
;
263 /* fn returns 0 to continue iteration */
264 #define IP6T_MATCH_ITERATE(e, fn, args...) \
268 struct ip6t_entry_match *__m; \
270 for (__i = sizeof(struct ip6t_entry); \
271 __i < (e)->target_offset; \
272 __i += __m->u.match_size) { \
273 __m = (void *)(e) + __i; \
275 __ret = fn(__m , ## args); \
282 /* fn returns 0 to continue iteration */
283 #define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \
287 struct ip6t_entry *__e; \
289 for (__i = 0; __i < (size); __i += __e->next_offset) { \
290 __e = (void *)(entries) + __i; \
292 __ret = fn(__e , ## args); \
300 * Main firewall chains definitions and global var's definitions.
305 #include <linux/init.h>
306 extern void ip6t_init(void) __init
;
308 extern int ip6t_register_table(struct xt_table
*table
,
309 const struct ip6t_replace
*repl
);
310 extern void ip6t_unregister_table(struct xt_table
*table
);
311 extern unsigned int ip6t_do_table(struct sk_buff
**pskb
,
313 const struct net_device
*in
,
314 const struct net_device
*out
,
315 struct xt_table
*table
);
317 /* Check for an extension */
318 extern int ip6t_ext_hdr(u8 nexthdr
);
319 /* find specified header and get offset to it */
320 extern int ipv6_find_hdr(const struct sk_buff
*skb
, unsigned int *offset
,
321 int target
, unsigned short *fragoff
);
323 extern int ip6_masked_addrcmp(const struct in6_addr
*addr1
,
324 const struct in6_addr
*mask
,
325 const struct in6_addr
*addr2
);
327 #define IP6T_ALIGN(s) (((s) + (__alignof__(struct ip6t_entry)-1)) & ~(__alignof__(struct ip6t_entry)-1))
329 #endif /*__KERNEL__*/
330 #endif /* _IP6_TABLES_H */