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;
121 struct inet6_dev *rt6i_idev;
122 unsigned long _rt6i_peer;
126 /* more non-fragment space at head required */
127 unsigned short rt6i_nfheader_len;
132 static inline struct inet_peer *rt6_peer_ptr(struct rt6_info *rt)
134 return inetpeer_ptr(rt->_rt6i_peer);
137 static inline bool rt6_has_peer(struct rt6_info *rt)
139 return inetpeer_ptr_is_peer(rt->_rt6i_peer);
142 static inline void __rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
144 __inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
147 static inline bool rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
149 return inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
152 static inline void rt6_init_peer(struct rt6_info *rt, struct inet_peer_base *base)
154 inetpeer_init_ptr(&rt->_rt6i_peer, base);
157 static inline void rt6_transfer_peer(struct rt6_info *rt, struct rt6_info *ort)
159 inetpeer_transfer_peer(&rt->_rt6i_peer, &ort->_rt6i_peer);
162 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
164 return ((struct rt6_info *)dst)->rt6i_idev;
167 static inline void rt6_clean_expires(struct rt6_info *rt)
169 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
170 dst_release(rt->dst.from);
172 rt->rt6i_flags &= ~RTF_EXPIRES;
176 static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
178 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
179 dst_release(rt->dst.from);
181 rt->rt6i_flags |= RTF_EXPIRES;
182 rt->dst.expires = expires;
185 static inline void rt6_update_expires(struct rt6_info *rt, int timeout)
187 if (!(rt->rt6i_flags & RTF_EXPIRES)) {
189 dst_release(rt->dst.from);
190 /* dst_set_expires relies on expires == 0
191 * if it has not been set previously.
196 dst_set_expires(&rt->dst, timeout);
197 rt->rt6i_flags |= RTF_EXPIRES;
200 static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
202 struct dst_entry *new = (struct dst_entry *) from;
204 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) {
205 if (new == rt->dst.from)
207 dst_release(rt->dst.from);
210 rt->rt6i_flags &= ~RTF_EXPIRES;
215 static inline void ip6_rt_put(struct rt6_info *rt)
217 /* dst_release() accepts a NULL parameter.
218 * We rely on dst being first structure in struct rt6_info
220 BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);
221 dst_release(&rt->dst);
224 struct fib6_walker_t {
226 struct fib6_node *root, *node;
227 struct rt6_info *leaf;
232 int (*func)(struct fib6_walker_t *);
236 struct rt6_statistics {
238 __u32 fib_route_nodes;
239 __u32 fib_rt_alloc; /* permanent routes */
240 __u32 fib_rt_entries; /* rt entries in table */
241 __u32 fib_rt_cache; /* cache routes */
242 __u32 fib_discarded_routes;
245 #define RTN_TL_ROOT 0x0001
246 #define RTN_ROOT 0x0002 /* tree root node */
247 #define RTN_RTINFO 0x0004 /* node with valid routing info */
250 * priority levels (or metrics)
256 struct hlist_node tb6_hlist;
259 struct fib6_node tb6_root;
260 struct inet_peer_base tb6_peers;
263 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
264 #define RT6_TABLE_MAIN RT_TABLE_MAIN
265 #define RT6_TABLE_DFLT RT6_TABLE_MAIN
266 #define RT6_TABLE_INFO RT6_TABLE_MAIN
267 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN
269 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
270 #define FIB6_TABLE_MIN 1
271 #define FIB6_TABLE_MAX RT_TABLE_MAX
272 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL
274 #define FIB6_TABLE_MIN RT_TABLE_MAIN
275 #define FIB6_TABLE_MAX FIB6_TABLE_MIN
276 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN
279 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
281 struct flowi6 *, int);
287 extern struct fib6_table *fib6_get_table(struct net *net, u32 id);
288 extern struct fib6_table *fib6_new_table(struct net *net, u32 id);
289 extern struct dst_entry *fib6_rule_lookup(struct net *net,
290 struct flowi6 *fl6, int flags,
291 pol_lookup_t lookup);
293 extern struct fib6_node *fib6_lookup(struct fib6_node *root,
294 const struct in6_addr *daddr,
295 const struct in6_addr *saddr);
297 struct fib6_node *fib6_locate(struct fib6_node *root,
298 const struct in6_addr *daddr, int dst_len,
299 const struct in6_addr *saddr, int src_len);
301 extern void fib6_clean_all_ro(struct net *net,
302 int (*func)(struct rt6_info *, void *arg),
303 int prune, void *arg);
305 extern void fib6_clean_all(struct net *net,
306 int (*func)(struct rt6_info *, void *arg),
307 int prune, void *arg);
309 extern int fib6_add(struct fib6_node *root,
311 struct nl_info *info);
313 extern int fib6_del(struct rt6_info *rt,
314 struct nl_info *info);
316 extern void inet6_rt_notify(int event, struct rt6_info *rt,
317 struct nl_info *info);
319 extern void fib6_run_gc(unsigned long expires,
322 extern void fib6_gc_cleanup(void);
324 extern int fib6_init(void);
326 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
327 extern int fib6_rules_init(void);
328 extern void fib6_rules_cleanup(void);
330 static inline int fib6_rules_init(void)
334 static inline void fib6_rules_cleanup(void)