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 /* FIXME: If alignment in kernel different from userspace? --RR */
60 struct ip6t_entry_match
66 /* Used by userspace */
67 char name[IP6T_FUNCTION_MAXNAMELEN-1];
73 /* Used inside the kernel */
74 struct ip6t_match *match;
81 unsigned char data[0];
84 struct ip6t_entry_target
88 u_int16_t target_size;
90 /* Used by userspace */
91 char name[IP6T_FUNCTION_MAXNAMELEN-1];
95 u_int16_t target_size;
97 /* Used inside the kernel */
98 struct ip6t_target *target;
102 u_int16_t target_size;
105 unsigned char data[0];
108 struct ip6t_standard_target
110 struct ip6t_entry_target target;
114 #define ip6t_counters xt_counters
116 /* Values for "flag" field in struct ip6t_ip6 (general ip6 structure). */
117 #define IP6T_F_PROTO 0x01 /* Set if rule cares about upper
119 #define IP6T_F_TOS 0x02 /* Match the TOS. */
120 #define IP6T_F_GOTO 0x04 /* Set if jump is a goto */
121 #define IP6T_F_MASK 0x07 /* All possible flag bits mask. */
123 /* Values for "inv" field in struct ip6t_ip6. */
124 #define IP6T_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */
125 #define IP6T_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */
126 #define IP6T_INV_TOS 0x04 /* Invert the sense of TOS. */
127 #define IP6T_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */
128 #define IP6T_INV_DSTIP 0x10 /* Invert the sense of DST OP. */
129 #define IP6T_INV_FRAG 0x20 /* Invert the sense of FRAG. */
130 #define IP6T_INV_PROTO XT_INV_PROTO
131 #define IP6T_INV_MASK 0x7F /* All possible flag bits mask. */
133 /* This structure defines each of the firewall rules. Consists of 3
134 parts which are 1) general IP header stuff 2) match specific
135 stuff 3) the target to perform if the rule matches */
138 struct ip6t_ip6 ipv6;
140 /* Mark with fields that we care about. */
141 unsigned int nfcache;
143 /* Size of ipt_entry + matches */
144 u_int16_t target_offset;
145 /* Size of ipt_entry + matches + target */
146 u_int16_t next_offset;
149 unsigned int comefrom;
151 /* Packet and byte counters. */
152 struct xt_counters counters;
154 /* The matches (if any), then the target. */
155 unsigned char elems[0];
159 * New IP firewall options for [gs]etsockopt at the RAW IP level.
160 * Unlike BSD Linux inherits IP options so you don't have to use
161 * a raw socket for this. Instead we check rights in the calls. */
162 #define IP6T_BASE_CTL XT_BASE_CTL
164 #define IP6T_SO_SET_REPLACE XT_SO_SET_REPLACE
165 #define IP6T_SO_SET_ADD_COUNTERS XT_SO_SET_ADD_COUNTERS
166 #define IP6T_SO_SET_MAX XT_SO_SET_MAX
168 #define IP6T_SO_GET_INFO XT_SO_GET_INFO
169 #define IP6T_SO_GET_ENTRIES XT_SO_GET_ENTRIES
170 #define IP6T_SO_GET_REVISION_MATCH XT_SO_GET_REVISION_MATCH
171 #define IP6T_SO_GET_REVISION_TARGET XT_SO_GET_REVISION_TARGET
172 #define IP6T_SO_GET_MAX XT_SO_GET_REVISION_TARGET
174 /* CONTINUE verdict for targets */
175 #define IP6T_CONTINUE XT_CONTINUE
177 /* For standard target */
178 #define IP6T_RETURN XT_RETURN
180 /* TCP/UDP matching stuff */
181 #include <linux/netfilter/xt_tcpudp.h>
183 #define ip6t_tcp xt_tcp
184 #define ip6t_udp xt_udp
186 /* Values for "inv" field in struct ipt_tcp. */
187 #define IP6T_TCP_INV_SRCPT XT_TCP_INV_SRCPT
188 #define IP6T_TCP_INV_DSTPT XT_TCP_INV_DSTPT
189 #define IP6T_TCP_INV_FLAGS XT_TCP_INV_FLAGS
190 #define IP6T_TCP_INV_OPTION XT_TCP_INV_OPTION
191 #define IP6T_TCP_INV_MASK XT_TCP_INV_MASK
193 /* Values for "invflags" field in struct ipt_udp. */
194 #define IP6T_UDP_INV_SRCPT XT_UDP_INV_SRCPT
195 #define IP6T_UDP_INV_DSTPT XT_UDP_INV_DSTPT
196 #define IP6T_UDP_INV_MASK XT_UDP_INV_MASK
198 /* ICMP matching stuff */
201 u_int8_t type; /* type to match */
202 u_int8_t code[2]; /* range of code */
203 u_int8_t invflags; /* Inverse flags */
206 /* Values for "inv" field for struct ipt_icmp. */
207 #define IP6T_ICMP_INV 0x01 /* Invert the sense of type/code test */
209 /* The argument to IP6T_SO_GET_INFO */
212 /* Which table: caller fills this in. */
213 char name[IP6T_TABLE_MAXNAMELEN];
215 /* Kernel fills these in. */
216 /* Which hook entry points are valid: bitmask */
217 unsigned int valid_hooks;
219 /* Hook entry points: one per netfilter hook. */
220 unsigned int hook_entry[NF_IP6_NUMHOOKS];
222 /* Underflow points. */
223 unsigned int underflow[NF_IP6_NUMHOOKS];
225 /* Number of entries */
226 unsigned int num_entries;
228 /* Size of entries. */
232 /* The argument to IP6T_SO_SET_REPLACE. */
236 char name[IP6T_TABLE_MAXNAMELEN];
238 /* Which hook entry points are valid: bitmask. You can't
240 unsigned int valid_hooks;
242 /* Number of entries */
243 unsigned int num_entries;
245 /* Total size of new entries */
248 /* Hook entry points. */
249 unsigned int hook_entry[NF_IP6_NUMHOOKS];
251 /* Underflow points. */
252 unsigned int underflow[NF_IP6_NUMHOOKS];
254 /* Information about old entries: */
255 /* Number of counters (must be equal to current number of entries). */
256 unsigned int num_counters;
257 /* The old entries' counters. */
258 struct xt_counters __user *counters;
260 /* The entries (hang off end: not really an array). */
261 struct ip6t_entry entries[0];
264 /* The argument to IP6T_SO_ADD_COUNTERS. */
265 #define ip6t_counters_info xt_counters_info
267 /* The argument to IP6T_SO_GET_ENTRIES. */
268 struct ip6t_get_entries
270 /* Which table: user fills this in. */
271 char name[IP6T_TABLE_MAXNAMELEN];
273 /* User fills this in: total entry size. */
277 struct ip6t_entry entrytable[0];
280 /* Standard return verdict, or do jump. */
281 #define IP6T_STANDARD_TARGET XT_STANDARD_TARGET
283 #define IP6T_ERROR_TARGET XT_ERROR_TARGET
285 /* Helper functions */
286 static __inline__ struct ip6t_entry_target *
287 ip6t_get_target(struct ip6t_entry *e)
289 return (void *)e + e->target_offset;
292 /* fn returns 0 to continue iteration */
293 #define IP6T_MATCH_ITERATE(e, fn, args...) \
297 struct ip6t_entry_match *__m; \
299 for (__i = sizeof(struct ip6t_entry); \
300 __i < (e)->target_offset; \
301 __i += __m->u.match_size) { \
302 __m = (void *)(e) + __i; \
304 __ret = fn(__m , ## args); \
311 /* fn returns 0 to continue iteration */
312 #define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \
316 struct ip6t_entry *__e; \
318 for (__i = 0; __i < (size); __i += __e->next_offset) { \
319 __e = (void *)(entries) + __i; \
321 __ret = fn(__e , ## args); \
329 * Main firewall chains definitions and global var's definitions.
334 #include <linux/init.h>
335 extern void ip6t_init(void) __init;
337 #define ip6t_register_target(tgt) \
338 ({ (tgt)->family = AF_INET6; \
339 xt_register_target(tgt); })
340 #define ip6t_unregister_target(tgt) xt_unregister_target(tgt)
342 #define ip6t_register_match(match) \
343 ({ (match)->family = AF_INET6; \
344 xt_register_match(match); })
345 #define ip6t_unregister_match(match) xt_unregister_match(match)
347 extern int ip6t_register_table(struct ip6t_table *table,
348 const struct ip6t_replace *repl);
349 extern void ip6t_unregister_table(struct ip6t_table *table);
350 extern unsigned int ip6t_do_table(struct sk_buff **pskb,
352 const struct net_device *in,
353 const struct net_device *out,
354 struct ip6t_table *table,
357 /* Check for an extension */
358 extern int ip6t_ext_hdr(u8 nexthdr);
359 /* find specified header and get offset to it */
360 extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
361 int target, unsigned short *fragoff);
363 extern int ip6_masked_addrcmp(const struct in6_addr *addr1,
364 const struct in6_addr *mask,
365 const struct in6_addr *addr2);
367 #define IP6T_ALIGN(s) (((s) + (__alignof__(struct ip6t_entry)-1)) & ~(__alignof__(struct ip6t_entry)-1))
369 #endif /*__KERNEL__*/
370 #endif /* _IP6_TABLES_H */