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;
122 struct inet6_dev *rt6i_idev;
123 unsigned long _rt6i_peer;
127 /* more non-fragment space at head required */
128 unsigned short rt6i_nfheader_len;
133 static inline struct inet_peer *rt6_peer_ptr(struct rt6_info *rt)
135 return inetpeer_ptr(rt->_rt6i_peer);
138 static inline bool rt6_has_peer(struct rt6_info *rt)
140 return inetpeer_ptr_is_peer(rt->_rt6i_peer);
143 static inline void __rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
145 __inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
148 static inline bool rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
150 return inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
153 static inline void rt6_init_peer(struct rt6_info *rt, struct inet_peer_base *base)
155 inetpeer_init_ptr(&rt->_rt6i_peer, base);
158 static inline void rt6_transfer_peer(struct rt6_info *rt, struct rt6_info *ort)
160 inetpeer_transfer_peer(&rt->_rt6i_peer, &ort->_rt6i_peer);
163 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
165 return ((struct rt6_info *)dst)->rt6i_idev;
168 static inline void rt6_clean_expires(struct rt6_info *rt)
170 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
171 dst_release(rt->dst.from);
173 rt->rt6i_flags &= ~RTF_EXPIRES;
177 static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
179 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
180 dst_release(rt->dst.from);
182 rt->rt6i_flags |= RTF_EXPIRES;
183 rt->dst.expires = expires;
186 static inline void rt6_update_expires(struct rt6_info *rt, int timeout)
188 if (!(rt->rt6i_flags & RTF_EXPIRES)) {
190 dst_release(rt->dst.from);
191 /* dst_set_expires relies on expires == 0
192 * if it has not been set previously.
197 dst_set_expires(&rt->dst, timeout);
198 rt->rt6i_flags |= RTF_EXPIRES;
201 static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
203 struct dst_entry *new = (struct dst_entry *) from;
205 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) {
206 if (new == rt->dst.from)
208 dst_release(rt->dst.from);
211 rt->rt6i_flags &= ~RTF_EXPIRES;
216 static inline void ip6_rt_put(struct rt6_info *rt)
218 /* dst_release() accepts a NULL parameter.
219 * We rely on dst being first structure in struct rt6_info
221 BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);
222 dst_release(&rt->dst);
225 struct fib6_walker_t {
227 struct fib6_node *root, *node;
228 struct rt6_info *leaf;
233 int (*func)(struct fib6_walker_t *);
237 struct rt6_statistics {
239 __u32 fib_route_nodes;
240 __u32 fib_rt_alloc; /* permanent routes */
241 __u32 fib_rt_entries; /* rt entries in table */
242 __u32 fib_rt_cache; /* cache routes */
243 __u32 fib_discarded_routes;
246 #define RTN_TL_ROOT 0x0001
247 #define RTN_ROOT 0x0002 /* tree root node */
248 #define RTN_RTINFO 0x0004 /* node with valid routing info */
251 * priority levels (or metrics)
257 struct hlist_node tb6_hlist;
260 struct fib6_node tb6_root;
261 struct inet_peer_base tb6_peers;
264 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
265 #define RT6_TABLE_MAIN RT_TABLE_MAIN
266 #define RT6_TABLE_DFLT RT6_TABLE_MAIN
267 #define RT6_TABLE_INFO RT6_TABLE_MAIN
268 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN
270 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
271 #define FIB6_TABLE_MIN 1
272 #define FIB6_TABLE_MAX RT_TABLE_MAX
273 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL
275 #define FIB6_TABLE_MIN RT_TABLE_MAIN
276 #define FIB6_TABLE_MAX FIB6_TABLE_MIN
277 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN
280 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
282 struct flowi6 *, int);
288 extern struct fib6_table *fib6_get_table(struct net *net, u32 id);
289 extern struct fib6_table *fib6_new_table(struct net *net, u32 id);
290 extern struct dst_entry *fib6_rule_lookup(struct net *net,
291 struct flowi6 *fl6, int flags,
292 pol_lookup_t lookup);
294 extern struct fib6_node *fib6_lookup(struct fib6_node *root,
295 const struct in6_addr *daddr,
296 const struct in6_addr *saddr);
298 struct fib6_node *fib6_locate(struct fib6_node *root,
299 const struct in6_addr *daddr, int dst_len,
300 const struct in6_addr *saddr, int src_len);
302 extern void fib6_clean_all_ro(struct net *net,
303 int (*func)(struct rt6_info *, void *arg),
304 int prune, void *arg);
306 extern void fib6_clean_all(struct net *net,
307 int (*func)(struct rt6_info *, void *arg),
308 int prune, void *arg);
310 extern int fib6_add(struct fib6_node *root,
312 struct nl_info *info);
314 extern int fib6_del(struct rt6_info *rt,
315 struct nl_info *info);
317 extern void inet6_rt_notify(int event, struct rt6_info *rt,
318 struct nl_info *info);
320 extern void fib6_run_gc(unsigned long expires,
323 extern void fib6_gc_cleanup(void);
325 extern int fib6_init(void);
327 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
328 extern int fib6_rules_init(void);
329 extern void fib6_rules_cleanup(void);
331 static inline int fib6_rules_init(void)
335 static inline void fib6_rules_cleanup(void)