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.
18 #include <linux/ipv6_route.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/spinlock.h>
23 #include <net/netlink.h>
25 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
26 #define FIB6_TABLE_HASHSZ 256
28 #define FIB6_TABLE_HASHSZ 1
42 struct in6_addr fc_dst;
43 struct in6_addr fc_src;
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)
89 #define rt6i_dev dst.dev
90 #define rt6i_nexthop dst.neighbour
91 #define rt6i_expires dst.expires
94 * Tail elements of dst_entry (__refcnt etc.)
95 * and these elements (rarely used in hot path) are in
96 * the same cache line.
98 struct fib6_table *rt6i_table;
99 struct fib6_node *rt6i_node;
101 struct in6_addr rt6i_gateway;
105 /* These are in a separate cache line. */
106 struct rt6key rt6i_dst ____cacheline_aligned_in_smp;
108 struct rt6key rt6i_src;
111 struct inet6_dev *rt6i_idev;
114 u32 rt6i_flow_cache_genid;
116 /* more non-fragment space at head required */
117 unsigned short rt6i_nfheader_len;
122 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
124 return ((struct rt6_info *)dst)->rt6i_idev;
127 struct fib6_walker_t {
129 struct fib6_node *root, *node;
130 struct rt6_info *leaf;
135 int (*func)(struct fib6_walker_t *);
139 struct rt6_statistics {
141 __u32 fib_route_nodes;
142 __u32 fib_rt_alloc; /* permanent routes */
143 __u32 fib_rt_entries; /* rt entries in table */
144 __u32 fib_rt_cache; /* cache routes */
145 __u32 fib_discarded_routes;
148 #define RTN_TL_ROOT 0x0001
149 #define RTN_ROOT 0x0002 /* tree root node */
150 #define RTN_RTINFO 0x0004 /* node with valid routing info */
153 * priority levels (or metrics)
159 struct hlist_node tb6_hlist;
162 struct fib6_node tb6_root;
165 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
166 #define RT6_TABLE_MAIN RT_TABLE_MAIN
167 #define RT6_TABLE_DFLT RT6_TABLE_MAIN
168 #define RT6_TABLE_INFO RT6_TABLE_MAIN
169 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN
171 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
172 #define FIB6_TABLE_MIN 1
173 #define FIB6_TABLE_MAX RT_TABLE_MAX
174 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL
176 #define FIB6_TABLE_MIN RT_TABLE_MAIN
177 #define FIB6_TABLE_MAX FIB6_TABLE_MIN
178 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN
181 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
183 struct flowi *, int);
189 extern struct fib6_table *fib6_get_table(struct net *net, u32 id);
190 extern struct fib6_table *fib6_new_table(struct net *net, u32 id);
191 extern struct dst_entry *fib6_rule_lookup(struct net *net,
192 struct flowi *fl, int flags,
193 pol_lookup_t lookup);
195 extern struct fib6_node *fib6_lookup(struct fib6_node *root,
196 struct in6_addr *daddr,
197 struct in6_addr *saddr);
199 struct fib6_node *fib6_locate(struct fib6_node *root,
200 struct in6_addr *daddr, int dst_len,
201 struct in6_addr *saddr, int src_len);
203 extern void fib6_clean_all(struct net *net,
204 int (*func)(struct rt6_info *, void *arg),
205 int prune, void *arg);
207 extern int fib6_add(struct fib6_node *root,
209 struct nl_info *info);
211 extern int fib6_del(struct rt6_info *rt,
212 struct nl_info *info);
214 extern void inet6_rt_notify(int event, struct rt6_info *rt,
215 struct nl_info *info);
217 extern void fib6_run_gc(unsigned long expires,
220 extern void fib6_gc_cleanup(void);
222 extern int fib6_init(void);
224 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
225 extern int fib6_rules_init(void);
226 extern void fib6_rules_cleanup(void);
228 static inline int fib6_rules_init(void)
232 static inline void fib6_rules_cleanup(void)