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)
95 * Tail elements of dst_entry (__refcnt etc.)
96 * and these elements (rarely used in hot path) are in
97 * the same cache line.
99 struct fib6_table
*rt6i_table
;
100 struct fib6_node
*rt6i_node
;
102 struct in6_addr rt6i_gateway
;
105 * siblings is a list of rt6_info that have the the same metric/weight,
106 * destination, but not the same gateway. nsiblings is just a cache
107 * to speed up lookup.
109 struct list_head rt6i_siblings
;
110 unsigned int rt6i_nsiblings
;
114 /* These are in a separate cache line. */
115 struct rt6key rt6i_dst ____cacheline_aligned_in_smp
;
117 struct rt6key rt6i_src
;
118 struct rt6key rt6i_prefsrc
;
121 struct inet6_dev
*rt6i_idev
;
122 unsigned long _rt6i_peer
;
126 /* more non-fragment space at head required */
127 unsigned short rt6i_nfheader_len
;
132 static inline struct inet_peer
*rt6_peer_ptr(struct rt6_info
*rt
)
134 return inetpeer_ptr(rt
->_rt6i_peer
);
137 static inline bool rt6_has_peer(struct rt6_info
*rt
)
139 return inetpeer_ptr_is_peer(rt
->_rt6i_peer
);
142 static inline void __rt6_set_peer(struct rt6_info
*rt
, struct inet_peer
*peer
)
144 __inetpeer_ptr_set_peer(&rt
->_rt6i_peer
, peer
);
147 static inline bool rt6_set_peer(struct rt6_info
*rt
, struct inet_peer
*peer
)
149 return inetpeer_ptr_set_peer(&rt
->_rt6i_peer
, peer
);
152 static inline void rt6_init_peer(struct rt6_info
*rt
, struct inet_peer_base
*base
)
154 inetpeer_init_ptr(&rt
->_rt6i_peer
, base
);
157 static inline void rt6_transfer_peer(struct rt6_info
*rt
, struct rt6_info
*ort
)
159 inetpeer_transfer_peer(&rt
->_rt6i_peer
, &ort
->_rt6i_peer
);
162 static inline struct inet6_dev
*ip6_dst_idev(struct dst_entry
*dst
)
164 return ((struct rt6_info
*)dst
)->rt6i_idev
;
167 static inline void rt6_clean_expires(struct rt6_info
*rt
)
169 if (!(rt
->rt6i_flags
& RTF_EXPIRES
) && rt
->dst
.from
)
170 dst_release(rt
->dst
.from
);
172 rt
->rt6i_flags
&= ~RTF_EXPIRES
;
176 static inline void rt6_set_expires(struct rt6_info
*rt
, unsigned long expires
)
178 if (!(rt
->rt6i_flags
& RTF_EXPIRES
) && rt
->dst
.from
)
179 dst_release(rt
->dst
.from
);
181 rt
->rt6i_flags
|= RTF_EXPIRES
;
182 rt
->dst
.expires
= expires
;
185 static inline void rt6_update_expires(struct rt6_info
*rt
, int timeout
)
187 if (!(rt
->rt6i_flags
& RTF_EXPIRES
)) {
189 dst_release(rt
->dst
.from
);
190 /* dst_set_expires relies on expires == 0
191 * if it has not been set previously.
196 dst_set_expires(&rt
->dst
, timeout
);
197 rt
->rt6i_flags
|= RTF_EXPIRES
;
200 static inline void rt6_set_from(struct rt6_info
*rt
, struct rt6_info
*from
)
202 struct dst_entry
*new = (struct dst_entry
*) from
;
204 if (!(rt
->rt6i_flags
& RTF_EXPIRES
) && rt
->dst
.from
) {
205 if (new == rt
->dst
.from
)
207 dst_release(rt
->dst
.from
);
210 rt
->rt6i_flags
&= ~RTF_EXPIRES
;
215 static inline void ip6_rt_put(struct rt6_info
*rt
)
217 /* dst_release() accepts a NULL parameter.
218 * We rely on dst being first structure in struct rt6_info
220 BUILD_BUG_ON(offsetof(struct rt6_info
, dst
) != 0);
221 dst_release(&rt
->dst
);
224 struct fib6_walker_t
{
226 struct fib6_node
*root
, *node
;
227 struct rt6_info
*leaf
;
232 int (*func
)(struct fib6_walker_t
*);
236 struct rt6_statistics
{
238 __u32 fib_route_nodes
;
239 __u32 fib_rt_alloc
; /* permanent routes */
240 __u32 fib_rt_entries
; /* rt entries in table */
241 __u32 fib_rt_cache
; /* cache routes */
242 __u32 fib_discarded_routes
;
245 #define RTN_TL_ROOT 0x0001
246 #define RTN_ROOT 0x0002 /* tree root node */
247 #define RTN_RTINFO 0x0004 /* node with valid routing info */
250 * priority levels (or metrics)
256 struct hlist_node tb6_hlist
;
259 struct fib6_node tb6_root
;
260 struct inet_peer_base tb6_peers
;
263 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
264 #define RT6_TABLE_MAIN RT_TABLE_MAIN
265 #define RT6_TABLE_DFLT RT6_TABLE_MAIN
266 #define RT6_TABLE_INFO RT6_TABLE_MAIN
267 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN
269 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
270 #define FIB6_TABLE_MIN 1
271 #define FIB6_TABLE_MAX RT_TABLE_MAX
272 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL
274 #define FIB6_TABLE_MIN RT_TABLE_MAIN
275 #define FIB6_TABLE_MAX FIB6_TABLE_MIN
276 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN
279 typedef struct rt6_info
*(*pol_lookup_t
)(struct net
*,
281 struct flowi6
*, int);
287 extern struct fib6_table
*fib6_get_table(struct net
*net
, u32 id
);
288 extern struct fib6_table
*fib6_new_table(struct net
*net
, u32 id
);
289 extern struct dst_entry
*fib6_rule_lookup(struct net
*net
,
290 struct flowi6
*fl6
, int flags
,
291 pol_lookup_t lookup
);
293 extern struct fib6_node
*fib6_lookup(struct fib6_node
*root
,
294 const struct in6_addr
*daddr
,
295 const struct in6_addr
*saddr
);
297 struct fib6_node
*fib6_locate(struct fib6_node
*root
,
298 const struct in6_addr
*daddr
, int dst_len
,
299 const struct in6_addr
*saddr
, int src_len
);
301 extern void fib6_clean_all_ro(struct net
*net
,
302 int (*func
)(struct rt6_info
*, void *arg
),
303 int prune
, void *arg
);
305 extern void fib6_clean_all(struct net
*net
,
306 int (*func
)(struct rt6_info
*, void *arg
),
307 int prune
, void *arg
);
309 extern int fib6_add(struct fib6_node
*root
,
311 struct nl_info
*info
);
313 extern int fib6_del(struct rt6_info
*rt
,
314 struct nl_info
*info
);
316 extern void inet6_rt_notify(int event
, struct rt6_info
*rt
,
317 struct nl_info
*info
);
319 extern void fib6_run_gc(unsigned long expires
,
322 extern void fib6_gc_cleanup(void);
324 extern int fib6_init(void);
326 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
327 extern int fib6_rules_init(void);
328 extern void fib6_rules_cleanup(void);
330 static inline int fib6_rules_init(void)
334 static inline void fib6_rules_cleanup(void)