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;
51 struct nl_info fc_nlinfo;
55 struct fib6_node *parent;
56 struct fib6_node *left;
57 struct fib6_node *right;
58 #ifdef CONFIG_IPV6_SUBTREES
59 struct fib6_node *subtree;
61 struct rt6_info *leaf;
63 __u16 fn_bit; /* bit key */
66 struct rt6_info *rr_ptr;
69 #ifndef CONFIG_IPV6_SUBTREES
70 #define FIB6_SUBTREE(fn) NULL
72 #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;
104 /* These are in a separate cache line. */
105 struct rt6key rt6i_dst ____cacheline_aligned_in_smp;
107 struct rt6key rt6i_src;
108 struct rt6key rt6i_prefsrc;
112 struct inet6_dev *rt6i_idev;
113 unsigned long _rt6i_peer;
116 u32 rt6i_flow_cache_genid;
118 /* more non-fragment space at head required */
119 unsigned short rt6i_nfheader_len;
124 static inline struct inet_peer *rt6_peer_ptr(struct rt6_info *rt)
126 return inetpeer_ptr(rt->_rt6i_peer);
129 static inline bool rt6_has_peer(struct rt6_info *rt)
131 return inetpeer_ptr_is_peer(rt->_rt6i_peer);
134 static inline void __rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
136 __inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
139 static inline bool rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
141 return inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
144 static inline void rt6_init_peer(struct rt6_info *rt, struct inet_peer_base *base)
146 inetpeer_init_ptr(&rt->_rt6i_peer, base);
149 static inline void rt6_transfer_peer(struct rt6_info *rt, struct rt6_info *ort)
151 inetpeer_transfer_peer(&rt->_rt6i_peer, &ort->_rt6i_peer);
154 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
156 return ((struct rt6_info *)dst)->rt6i_idev;
159 static inline void rt6_clean_expires(struct rt6_info *rt)
161 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
162 dst_release(rt->dst.from);
164 rt->rt6i_flags &= ~RTF_EXPIRES;
168 static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
170 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
171 dst_release(rt->dst.from);
173 rt->rt6i_flags |= RTF_EXPIRES;
174 rt->dst.expires = expires;
177 static inline void rt6_update_expires(struct rt6_info *rt, int timeout)
179 if (!(rt->rt6i_flags & RTF_EXPIRES)) {
181 dst_release(rt->dst.from);
182 /* dst_set_expires relies on expires == 0
183 * if it has not been set previously.
188 dst_set_expires(&rt->dst, timeout);
189 rt->rt6i_flags |= RTF_EXPIRES;
192 static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
194 struct dst_entry *new = (struct dst_entry *) from;
196 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) {
197 if (new == rt->dst.from)
199 dst_release(rt->dst.from);
202 rt->rt6i_flags &= ~RTF_EXPIRES;
207 struct fib6_walker_t {
209 struct fib6_node *root, *node;
210 struct rt6_info *leaf;
215 int (*func)(struct fib6_walker_t *);
219 struct rt6_statistics {
221 __u32 fib_route_nodes;
222 __u32 fib_rt_alloc; /* permanent routes */
223 __u32 fib_rt_entries; /* rt entries in table */
224 __u32 fib_rt_cache; /* cache routes */
225 __u32 fib_discarded_routes;
228 #define RTN_TL_ROOT 0x0001
229 #define RTN_ROOT 0x0002 /* tree root node */
230 #define RTN_RTINFO 0x0004 /* node with valid routing info */
233 * priority levels (or metrics)
239 struct hlist_node tb6_hlist;
242 struct fib6_node tb6_root;
243 struct inet_peer_base tb6_peers;
246 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
247 #define RT6_TABLE_MAIN RT_TABLE_MAIN
248 #define RT6_TABLE_DFLT RT6_TABLE_MAIN
249 #define RT6_TABLE_INFO RT6_TABLE_MAIN
250 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN
252 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
253 #define FIB6_TABLE_MIN 1
254 #define FIB6_TABLE_MAX RT_TABLE_MAX
255 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL
257 #define FIB6_TABLE_MIN RT_TABLE_MAIN
258 #define FIB6_TABLE_MAX FIB6_TABLE_MIN
259 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN
262 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
264 struct flowi6 *, int);
270 extern struct fib6_table *fib6_get_table(struct net *net, u32 id);
271 extern struct fib6_table *fib6_new_table(struct net *net, u32 id);
272 extern struct dst_entry *fib6_rule_lookup(struct net *net,
273 struct flowi6 *fl6, int flags,
274 pol_lookup_t lookup);
276 extern struct fib6_node *fib6_lookup(struct fib6_node *root,
277 const struct in6_addr *daddr,
278 const struct in6_addr *saddr);
280 struct fib6_node *fib6_locate(struct fib6_node *root,
281 const struct in6_addr *daddr, int dst_len,
282 const struct in6_addr *saddr, int src_len);
284 extern void fib6_clean_all_ro(struct net *net,
285 int (*func)(struct rt6_info *, void *arg),
286 int prune, void *arg);
288 extern void fib6_clean_all(struct net *net,
289 int (*func)(struct rt6_info *, void *arg),
290 int prune, void *arg);
292 extern int fib6_add(struct fib6_node *root,
294 struct nl_info *info);
296 extern int fib6_del(struct rt6_info *rt,
297 struct nl_info *info);
299 extern void inet6_rt_notify(int event, struct rt6_info *rt,
300 struct nl_info *info);
302 extern void fib6_run_gc(unsigned long expires,
305 extern void fib6_gc_cleanup(void);
307 extern int fib6_init(void);
309 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
310 extern int fib6_rules_init(void);
311 extern void fib6_rules_cleanup(void);
313 static inline int fib6_rules_init(void)
317 static inline void fib6_rules_cleanup(void)