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
41 struct in6_addr fc_dst;
42 struct in6_addr fc_src;
43 struct in6_addr fc_prefsrc;
44 struct in6_addr fc_gateway;
46 unsigned long fc_expires;
50 struct nl_info fc_nlinfo;
54 struct fib6_node *parent;
55 struct fib6_node *left;
56 struct fib6_node *right;
57 #ifdef CONFIG_IPV6_SUBTREES
58 struct fib6_node *subtree;
60 struct rt6_info *leaf;
62 __u16 fn_bit; /* bit key */
65 struct rt6_info *rr_ptr;
68 #ifndef CONFIG_IPV6_SUBTREES
69 #define FIB6_SUBTREE(fn) NULL
71 #define FIB6_SUBTREE(fn) ((fn)->subtree)
90 * Tail elements of dst_entry (__refcnt etc.)
91 * and these elements (rarely used in hot path) are in
92 * the same cache line.
94 struct fib6_table *rt6i_table;
95 struct fib6_node *rt6i_node;
97 struct in6_addr rt6i_gateway;
101 /* These are in a separate cache line. */
102 struct rt6key rt6i_dst ____cacheline_aligned_in_smp;
104 struct rt6key rt6i_src;
105 struct rt6key rt6i_prefsrc;
109 struct inet6_dev *rt6i_idev;
110 struct inet_peer *rt6i_peer;
113 u32 rt6i_flow_cache_genid;
115 /* more non-fragment space at head required */
116 unsigned short rt6i_nfheader_len;
121 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
123 return ((struct rt6_info *)dst)->rt6i_idev;
126 static inline void rt6_clean_expires(struct rt6_info *rt)
128 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
129 dst_release(rt->dst.from);
131 rt->rt6i_flags &= ~RTF_EXPIRES;
135 static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
137 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
138 dst_release(rt->dst.from);
140 rt->rt6i_flags |= RTF_EXPIRES;
141 rt->dst.expires = expires;
144 static inline void rt6_update_expires(struct rt6_info *rt, int timeout)
146 if (!(rt->rt6i_flags & RTF_EXPIRES)) {
148 dst_release(rt->dst.from);
149 /* dst_set_expires relies on expires == 0
150 * if it has not been set previously.
155 dst_set_expires(&rt->dst, timeout);
156 rt->rt6i_flags |= RTF_EXPIRES;
159 static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
161 struct dst_entry *new = (struct dst_entry *) from;
163 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) {
164 if (new == rt->dst.from)
166 dst_release(rt->dst.from);
169 rt->rt6i_flags &= ~RTF_EXPIRES;
174 struct fib6_walker_t {
176 struct fib6_node *root, *node;
177 struct rt6_info *leaf;
182 int (*func)(struct fib6_walker_t *);
186 struct rt6_statistics {
188 __u32 fib_route_nodes;
189 __u32 fib_rt_alloc; /* permanent routes */
190 __u32 fib_rt_entries; /* rt entries in table */
191 __u32 fib_rt_cache; /* cache routes */
192 __u32 fib_discarded_routes;
195 #define RTN_TL_ROOT 0x0001
196 #define RTN_ROOT 0x0002 /* tree root node */
197 #define RTN_RTINFO 0x0004 /* node with valid routing info */
200 * priority levels (or metrics)
206 struct hlist_node tb6_hlist;
209 struct fib6_node tb6_root;
212 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
213 #define RT6_TABLE_MAIN RT_TABLE_MAIN
214 #define RT6_TABLE_DFLT RT6_TABLE_MAIN
215 #define RT6_TABLE_INFO RT6_TABLE_MAIN
216 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN
218 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
219 #define FIB6_TABLE_MIN 1
220 #define FIB6_TABLE_MAX RT_TABLE_MAX
221 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL
223 #define FIB6_TABLE_MIN RT_TABLE_MAIN
224 #define FIB6_TABLE_MAX FIB6_TABLE_MIN
225 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN
228 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
230 struct flowi6 *, int);
236 extern struct fib6_table *fib6_get_table(struct net *net, u32 id);
237 extern struct fib6_table *fib6_new_table(struct net *net, u32 id);
238 extern struct dst_entry *fib6_rule_lookup(struct net *net,
239 struct flowi6 *fl6, int flags,
240 pol_lookup_t lookup);
242 extern struct fib6_node *fib6_lookup(struct fib6_node *root,
243 const struct in6_addr *daddr,
244 const struct in6_addr *saddr);
246 struct fib6_node *fib6_locate(struct fib6_node *root,
247 const struct in6_addr *daddr, int dst_len,
248 const struct in6_addr *saddr, int src_len);
250 extern void fib6_clean_all_ro(struct net *net,
251 int (*func)(struct rt6_info *, void *arg),
252 int prune, void *arg);
254 extern void fib6_clean_all(struct net *net,
255 int (*func)(struct rt6_info *, void *arg),
256 int prune, void *arg);
258 extern int fib6_add(struct fib6_node *root,
260 struct nl_info *info);
262 extern int fib6_del(struct rt6_info *rt,
263 struct nl_info *info);
265 extern void inet6_rt_notify(int event, struct rt6_info *rt,
266 struct nl_info *info);
268 extern void fib6_run_gc(unsigned long expires,
271 extern void fib6_gc_cleanup(void);
273 extern int fib6_init(void);
275 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
276 extern int fib6_rules_init(void);
277 extern void fib6_rules_cleanup(void);
279 static inline int fib6_rules_init(void)
283 static inline void fib6_rules_cleanup(void)