2 * Linux INET6 implementation
5 * Pedro Roque <roque@di.fc.ul.pt>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
16 #include <linux/ipv6_route.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/spinlock.h>
21 #include <net/netlink.h>
22 #include <net/inetpeer.h>
24 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
25 #define FIB6_TABLE_HASHSZ 256
27 #define FIB6_TABLE_HASHSZ 1
40 u32 fc_type
; /* only 8 bits are used */
42 struct in6_addr fc_dst
;
43 struct in6_addr fc_src
;
44 struct in6_addr fc_prefsrc
;
45 struct in6_addr fc_gateway
;
47 unsigned long fc_expires
;
53 struct nl_info fc_nlinfo
;
57 struct fib6_node
*parent
;
58 struct fib6_node
*left
;
59 struct fib6_node
*right
;
60 #ifdef CONFIG_IPV6_SUBTREES
61 struct fib6_node
*subtree
;
63 struct rt6_info
*leaf
;
65 __u16 fn_bit
; /* bit key */
68 struct rt6_info
*rr_ptr
;
71 #ifndef CONFIG_IPV6_SUBTREES
72 #define FIB6_SUBTREE(fn) NULL
74 #define FIB6_SUBTREE(fn) ((fn)->subtree)
93 * Tail elements of dst_entry (__refcnt etc.)
94 * and these elements (rarely used in hot path) are in
95 * the same cache line.
97 struct fib6_table
*rt6i_table
;
98 struct fib6_node
*rt6i_node
;
100 struct in6_addr rt6i_gateway
;
103 * siblings is a list of rt6_info that have the the same metric/weight,
104 * destination, but not the same gateway. nsiblings is just a cache
105 * to speed up lookup.
107 struct list_head rt6i_siblings
;
108 unsigned int rt6i_nsiblings
;
112 /* These are in a separate cache line. */
113 struct rt6key rt6i_dst ____cacheline_aligned_in_smp
;
115 struct rt6key rt6i_src
;
116 struct rt6key rt6i_prefsrc
;
119 struct inet6_dev
*rt6i_idev
;
120 unsigned long _rt6i_peer
;
124 /* more non-fragment space at head required */
125 unsigned short rt6i_nfheader_len
;
130 static inline struct inet_peer
*rt6_peer_ptr(struct rt6_info
*rt
)
132 return inetpeer_ptr(rt
->_rt6i_peer
);
135 static inline bool rt6_has_peer(struct rt6_info
*rt
)
137 return inetpeer_ptr_is_peer(rt
->_rt6i_peer
);
140 static inline void __rt6_set_peer(struct rt6_info
*rt
, struct inet_peer
*peer
)
142 __inetpeer_ptr_set_peer(&rt
->_rt6i_peer
, peer
);
145 static inline bool rt6_set_peer(struct rt6_info
*rt
, struct inet_peer
*peer
)
147 return inetpeer_ptr_set_peer(&rt
->_rt6i_peer
, peer
);
150 static inline void rt6_init_peer(struct rt6_info
*rt
, struct inet_peer_base
*base
)
152 inetpeer_init_ptr(&rt
->_rt6i_peer
, base
);
155 static inline void rt6_transfer_peer(struct rt6_info
*rt
, struct rt6_info
*ort
)
157 inetpeer_transfer_peer(&rt
->_rt6i_peer
, &ort
->_rt6i_peer
);
160 static inline struct inet6_dev
*ip6_dst_idev(struct dst_entry
*dst
)
162 return ((struct rt6_info
*)dst
)->rt6i_idev
;
165 static inline void rt6_clean_expires(struct rt6_info
*rt
)
167 if (!(rt
->rt6i_flags
& RTF_EXPIRES
) && rt
->dst
.from
)
168 dst_release(rt
->dst
.from
);
170 rt
->rt6i_flags
&= ~RTF_EXPIRES
;
174 static inline void rt6_set_expires(struct rt6_info
*rt
, unsigned long expires
)
176 if (!(rt
->rt6i_flags
& RTF_EXPIRES
) && rt
->dst
.from
)
177 dst_release(rt
->dst
.from
);
179 rt
->rt6i_flags
|= RTF_EXPIRES
;
180 rt
->dst
.expires
= expires
;
183 static inline void rt6_update_expires(struct rt6_info
*rt
, int timeout
)
185 if (!(rt
->rt6i_flags
& RTF_EXPIRES
)) {
187 dst_release(rt
->dst
.from
);
188 /* dst_set_expires relies on expires == 0
189 * if it has not been set previously.
194 dst_set_expires(&rt
->dst
, timeout
);
195 rt
->rt6i_flags
|= RTF_EXPIRES
;
198 static inline void rt6_set_from(struct rt6_info
*rt
, struct rt6_info
*from
)
200 struct dst_entry
*new = (struct dst_entry
*) from
;
202 if (!(rt
->rt6i_flags
& RTF_EXPIRES
) && rt
->dst
.from
) {
203 if (new == rt
->dst
.from
)
205 dst_release(rt
->dst
.from
);
208 rt
->rt6i_flags
&= ~RTF_EXPIRES
;
213 static inline void ip6_rt_put(struct rt6_info
*rt
)
215 /* dst_release() accepts a NULL parameter.
216 * We rely on dst being first structure in struct rt6_info
218 BUILD_BUG_ON(offsetof(struct rt6_info
, dst
) != 0);
219 dst_release(&rt
->dst
);
222 struct fib6_walker_t
{
224 struct fib6_node
*root
, *node
;
225 struct rt6_info
*leaf
;
230 int (*func
)(struct fib6_walker_t
*);
234 struct rt6_statistics
{
236 __u32 fib_route_nodes
;
237 __u32 fib_rt_alloc
; /* permanent routes */
238 __u32 fib_rt_entries
; /* rt entries in table */
239 __u32 fib_rt_cache
; /* cache routes */
240 __u32 fib_discarded_routes
;
243 #define RTN_TL_ROOT 0x0001
244 #define RTN_ROOT 0x0002 /* tree root node */
245 #define RTN_RTINFO 0x0004 /* node with valid routing info */
248 * priority levels (or metrics)
254 struct hlist_node tb6_hlist
;
257 struct fib6_node tb6_root
;
258 struct inet_peer_base tb6_peers
;
261 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
262 #define RT6_TABLE_MAIN RT_TABLE_MAIN
263 #define RT6_TABLE_DFLT RT6_TABLE_MAIN
264 #define RT6_TABLE_INFO RT6_TABLE_MAIN
265 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN
267 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
268 #define FIB6_TABLE_MIN 1
269 #define FIB6_TABLE_MAX RT_TABLE_MAX
270 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL
272 #define FIB6_TABLE_MIN RT_TABLE_MAIN
273 #define FIB6_TABLE_MAX FIB6_TABLE_MIN
274 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN
277 typedef struct rt6_info
*(*pol_lookup_t
)(struct net
*,
279 struct flowi6
*, int);
285 extern struct fib6_table
*fib6_get_table(struct net
*net
, u32 id
);
286 extern struct fib6_table
*fib6_new_table(struct net
*net
, u32 id
);
287 extern struct dst_entry
*fib6_rule_lookup(struct net
*net
,
288 struct flowi6
*fl6
, int flags
,
289 pol_lookup_t lookup
);
291 extern struct fib6_node
*fib6_lookup(struct fib6_node
*root
,
292 const struct in6_addr
*daddr
,
293 const struct in6_addr
*saddr
);
295 struct fib6_node
*fib6_locate(struct fib6_node
*root
,
296 const struct in6_addr
*daddr
, int dst_len
,
297 const struct in6_addr
*saddr
, int src_len
);
299 extern void fib6_clean_all_ro(struct net
*net
,
300 int (*func
)(struct rt6_info
*, void *arg
),
301 int prune
, void *arg
);
303 extern void fib6_clean_all(struct net
*net
,
304 int (*func
)(struct rt6_info
*, void *arg
),
305 int prune
, void *arg
);
307 extern int fib6_add(struct fib6_node
*root
,
309 struct nl_info
*info
);
311 extern int fib6_del(struct rt6_info
*rt
,
312 struct nl_info
*info
);
314 extern void inet6_rt_notify(int event
, struct rt6_info
*rt
,
315 struct nl_info
*info
);
317 extern void fib6_run_gc(unsigned long expires
,
320 extern void fib6_gc_cleanup(void);
322 extern int fib6_init(void);
324 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
325 extern int fib6_rules_init(void);
326 extern void fib6_rules_cleanup(void);
328 static inline int fib6_rules_init(void)
332 static inline void fib6_rules_cleanup(void)