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 unsigned long _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 inet_peer *rt6_peer_ptr(struct rt6_info *rt)
123 return inetpeer_ptr(rt->_rt6i_peer);
126 static inline bool rt6_has_peer(struct rt6_info *rt)
128 return inetpeer_ptr_is_peer(rt->_rt6i_peer);
131 static inline void __rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
133 __inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
136 static inline bool rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
138 return inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
141 static inline void rt6_init_peer(struct rt6_info *rt, struct inet_peer_base *base)
143 inetpeer_init_ptr(&rt->_rt6i_peer, base);
146 static inline void rt6_transfer_peer(struct rt6_info *rt, struct rt6_info *ort)
148 inetpeer_transfer_peer(&rt->_rt6i_peer, &ort->_rt6i_peer);
151 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
153 return ((struct rt6_info *)dst)->rt6i_idev;
156 static inline void rt6_clean_expires(struct rt6_info *rt)
158 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
159 dst_release(rt->dst.from);
161 rt->rt6i_flags &= ~RTF_EXPIRES;
165 static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
167 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
168 dst_release(rt->dst.from);
170 rt->rt6i_flags |= RTF_EXPIRES;
171 rt->dst.expires = expires;
174 static inline void rt6_update_expires(struct rt6_info *rt, int timeout)
176 if (!(rt->rt6i_flags & RTF_EXPIRES)) {
178 dst_release(rt->dst.from);
179 /* dst_set_expires relies on expires == 0
180 * if it has not been set previously.
185 dst_set_expires(&rt->dst, timeout);
186 rt->rt6i_flags |= RTF_EXPIRES;
189 static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
191 struct dst_entry *new = (struct dst_entry *) from;
193 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) {
194 if (new == rt->dst.from)
196 dst_release(rt->dst.from);
199 rt->rt6i_flags &= ~RTF_EXPIRES;
204 struct fib6_walker_t {
206 struct fib6_node *root, *node;
207 struct rt6_info *leaf;
212 int (*func)(struct fib6_walker_t *);
216 struct rt6_statistics {
218 __u32 fib_route_nodes;
219 __u32 fib_rt_alloc; /* permanent routes */
220 __u32 fib_rt_entries; /* rt entries in table */
221 __u32 fib_rt_cache; /* cache routes */
222 __u32 fib_discarded_routes;
225 #define RTN_TL_ROOT 0x0001
226 #define RTN_ROOT 0x0002 /* tree root node */
227 #define RTN_RTINFO 0x0004 /* node with valid routing info */
230 * priority levels (or metrics)
236 struct hlist_node tb6_hlist;
239 struct fib6_node tb6_root;
240 struct inet_peer_base tb6_peers;
243 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
244 #define RT6_TABLE_MAIN RT_TABLE_MAIN
245 #define RT6_TABLE_DFLT RT6_TABLE_MAIN
246 #define RT6_TABLE_INFO RT6_TABLE_MAIN
247 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN
249 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
250 #define FIB6_TABLE_MIN 1
251 #define FIB6_TABLE_MAX RT_TABLE_MAX
252 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL
254 #define FIB6_TABLE_MIN RT_TABLE_MAIN
255 #define FIB6_TABLE_MAX FIB6_TABLE_MIN
256 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN
259 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
261 struct flowi6 *, int);
267 extern struct fib6_table *fib6_get_table(struct net *net, u32 id);
268 extern struct fib6_table *fib6_new_table(struct net *net, u32 id);
269 extern struct dst_entry *fib6_rule_lookup(struct net *net,
270 struct flowi6 *fl6, int flags,
271 pol_lookup_t lookup);
273 extern struct fib6_node *fib6_lookup(struct fib6_node *root,
274 const struct in6_addr *daddr,
275 const struct in6_addr *saddr);
277 struct fib6_node *fib6_locate(struct fib6_node *root,
278 const struct in6_addr *daddr, int dst_len,
279 const struct in6_addr *saddr, int src_len);
281 extern void fib6_clean_all_ro(struct net *net,
282 int (*func)(struct rt6_info *, void *arg),
283 int prune, void *arg);
285 extern void fib6_clean_all(struct net *net,
286 int (*func)(struct rt6_info *, void *arg),
287 int prune, void *arg);
289 extern int fib6_add(struct fib6_node *root,
291 struct nl_info *info);
293 extern int fib6_del(struct rt6_info *rt,
294 struct nl_info *info);
296 extern void inet6_rt_notify(int event, struct rt6_info *rt,
297 struct nl_info *info);
299 extern void fib6_run_gc(unsigned long expires,
302 extern void fib6_gc_cleanup(void);
304 extern int fib6_init(void);
305 extern int fib6_init_late(void);
306 extern void fib6_cleanup_late(void);
308 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
309 extern int fib6_rules_init(void);
310 extern void fib6_rules_cleanup(void);
312 static inline int fib6_rules_init(void)
316 static inline void fib6_rules_cleanup(void)