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>
24 #include <net/inetpeer.h>
26 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
27 #define FIB6_TABLE_HASHSZ 256
29 #define FIB6_TABLE_HASHSZ 1
43 struct in6_addr fc_dst;
44 struct in6_addr fc_src;
45 struct in6_addr fc_gateway;
47 unsigned long fc_expires;
51 struct nl_info fc_nlinfo;
55 struct fib6_node *parent;
56 struct fib6_node *left;
57 struct fib6_node *right;
58 #ifdef CONFIG_IPV6_SUBTREES
59 struct fib6_node *subtree;
61 struct rt6_info *leaf;
63 __u16 fn_bit; /* bit key */
66 struct rt6_info *rr_ptr;
69 #ifndef CONFIG_IPV6_SUBTREES
70 #define FIB6_SUBTREE(fn) NULL
72 #define FIB6_SUBTREE(fn) ((fn)->subtree)
90 #define rt6i_dev dst.dev
91 #define rt6i_nexthop dst.neighbour
92 #define rt6i_expires dst.expires
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;
106 /* These are in a separate cache line. */
107 struct rt6key rt6i_dst ____cacheline_aligned_in_smp;
109 struct rt6key rt6i_src;
112 struct inet6_dev *rt6i_idev;
113 struct inet_peer *rt6i_peer;
116 u32 rt6i_flow_cache_genid;
118 /* more non-fragment space at head required */
119 unsigned short rt6i_nfheader_len;
124 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
126 return ((struct rt6_info *)dst)->rt6i_idev;
129 struct fib6_walker_t {
131 struct fib6_node *root, *node;
132 struct rt6_info *leaf;
137 int (*func)(struct fib6_walker_t *);
141 struct rt6_statistics {
143 __u32 fib_route_nodes;
144 __u32 fib_rt_alloc; /* permanent routes */
145 __u32 fib_rt_entries; /* rt entries in table */
146 __u32 fib_rt_cache; /* cache routes */
147 __u32 fib_discarded_routes;
150 #define RTN_TL_ROOT 0x0001
151 #define RTN_ROOT 0x0002 /* tree root node */
152 #define RTN_RTINFO 0x0004 /* node with valid routing info */
155 * priority levels (or metrics)
161 struct hlist_node tb6_hlist;
164 struct fib6_node tb6_root;
167 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
168 #define RT6_TABLE_MAIN RT_TABLE_MAIN
169 #define RT6_TABLE_DFLT RT6_TABLE_MAIN
170 #define RT6_TABLE_INFO RT6_TABLE_MAIN
171 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN
173 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
174 #define FIB6_TABLE_MIN 1
175 #define FIB6_TABLE_MAX RT_TABLE_MAX
176 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL
178 #define FIB6_TABLE_MIN RT_TABLE_MAIN
179 #define FIB6_TABLE_MAX FIB6_TABLE_MIN
180 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN
183 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
185 struct flowi *, int);
191 extern struct fib6_table *fib6_get_table(struct net *net, u32 id);
192 extern struct fib6_table *fib6_new_table(struct net *net, u32 id);
193 extern struct dst_entry *fib6_rule_lookup(struct net *net,
194 struct flowi *fl, int flags,
195 pol_lookup_t lookup);
197 extern struct fib6_node *fib6_lookup(struct fib6_node *root,
198 struct in6_addr *daddr,
199 struct in6_addr *saddr);
201 struct fib6_node *fib6_locate(struct fib6_node *root,
202 struct in6_addr *daddr, int dst_len,
203 struct in6_addr *saddr, int src_len);
205 extern void fib6_clean_all(struct net *net,
206 int (*func)(struct rt6_info *, void *arg),
207 int prune, void *arg);
209 extern int fib6_add(struct fib6_node *root,
211 struct nl_info *info);
213 extern int fib6_del(struct rt6_info *rt,
214 struct nl_info *info);
216 extern void inet6_rt_notify(int event, struct rt6_info *rt,
217 struct nl_info *info);
219 extern void fib6_run_gc(unsigned long expires,
222 extern void fib6_gc_cleanup(void);
224 extern int fib6_init(void);
226 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
227 extern int fib6_rules_init(void);
228 extern void fib6_rules_cleanup(void);
230 static inline int fib6_rules_init(void)
234 static inline void fib6_rules_cleanup(void)