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)