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>
22 #include <linux/rtnetlink.h>
23 #include <linux/spinlock.h>
29 struct fib6_node *parent;
30 struct fib6_node *left;
31 struct fib6_node *right;
33 struct fib6_node *subtree;
35 struct rt6_info *leaf;
37 __u16 fn_bit; /* bit key */
60 struct rt6_info *next;
63 struct inet6_dev *rt6i_idev;
65 #define rt6i_dev u.dst.dev
66 #define rt6i_nexthop u.dst.neighbour
67 #define rt6i_expires u.dst.expires
69 struct fib6_node *rt6i_node;
71 struct in6_addr rt6i_gateway;
76 struct fib6_table *rt6i_table;
78 struct rt6key rt6i_dst;
79 struct rt6key rt6i_src;
86 struct fib6_walker_t *prev, *next;
87 struct fib6_node *root, *node;
88 struct rt6_info *leaf;
91 int (*func)(struct fib6_walker_t *);
95 extern struct fib6_walker_t fib6_walker_list;
96 extern rwlock_t fib6_walker_lock;
98 static inline void fib6_walker_link(struct fib6_walker_t *w)
100 write_lock_bh(&fib6_walker_lock);
101 w->next = fib6_walker_list.next;
102 w->prev = &fib6_walker_list;
105 write_unlock_bh(&fib6_walker_lock);
108 static inline void fib6_walker_unlink(struct fib6_walker_t *w)
110 write_lock_bh(&fib6_walker_lock);
111 w->next->prev = w->prev;
112 w->prev->next = w->next;
113 w->prev = w->next = w;
114 write_unlock_bh(&fib6_walker_lock);
117 struct rt6_statistics {
119 __u32 fib_route_nodes;
120 __u32 fib_rt_alloc; /* permanent routes */
121 __u32 fib_rt_entries; /* rt entries in table */
122 __u32 fib_rt_cache; /* cache routes */
123 __u32 fib_discarded_routes;
126 #define RTN_TL_ROOT 0x0001
127 #define RTN_ROOT 0x0002 /* tree root node */
128 #define RTN_RTINFO 0x0004 /* node with valid routing info */
131 * priority levels (or metrics)
135 #define RTPRI_FIREWALL 8 /* Firewall control information */
136 #define RTPRI_FLOW 16 /* Flow based forwarding rules */
137 #define RTPRI_KERN_CTL 32 /* Kernel control routes */
139 #define RTPRI_USER_MIN 256 /* Mimimum user priority */
140 #define RTPRI_USER_MAX 1024 /* Maximum user priority */
142 #define RTPRI_KERN_DFLT 4096 /* Kernel default routes */
144 #define MAX_FLOW_BACKTRACE 32
147 typedef void (*f_pnode)(struct fib6_node *fn, void *);
150 struct hlist_node tb6_hlist;
153 struct fib6_node tb6_root;
156 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
157 #define RT6_TABLE_MAIN RT_TABLE_MAIN
158 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN
159 #define RT6_TABLE_DFLT RT6_TABLE_MAIN
160 #define RT6_TABLE_INFO RT6_TABLE_MAIN
161 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN
163 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
164 #define FIB6_TABLE_MIN 1
165 #define FIB6_TABLE_MAX RT_TABLE_MAX
167 #define FIB6_TABLE_MIN RT_TABLE_MAIN
168 #define FIB6_TABLE_MAX FIB6_TABLE_MIN
171 #define RT6_F_STRICT 1
172 #define RT6_F_HAS_SADDR 2
174 typedef struct rt6_info *(*pol_lookup_t)(struct fib6_table *,
175 struct flowi *, int);
181 extern struct fib6_table * fib6_get_table(u32 id);
182 extern struct fib6_table * fib6_new_table(u32 id);
183 extern struct dst_entry * fib6_rule_lookup(struct flowi *fl, int flags,
184 pol_lookup_t lookup);
186 extern struct fib6_node *fib6_lookup(struct fib6_node *root,
187 struct in6_addr *daddr,
188 struct in6_addr *saddr);
190 struct fib6_node *fib6_locate(struct fib6_node *root,
191 struct in6_addr *daddr, int dst_len,
192 struct in6_addr *saddr, int src_len);
194 extern void fib6_clean_tree(struct fib6_node *root,
195 int (*func)(struct rt6_info *, void *arg),
196 int prune, void *arg);
198 extern void fib6_clean_all(int (*func)(struct rt6_info *, void *arg),
199 int prune, void *arg);
201 extern int fib6_walk(struct fib6_walker_t *w);
202 extern int fib6_walk_continue(struct fib6_walker_t *w);
204 extern int fib6_add(struct fib6_node *root,
206 struct nlmsghdr *nlh,
208 struct netlink_skb_parms *req);
210 extern int fib6_del(struct rt6_info *rt,
211 struct nlmsghdr *nlh,
213 struct netlink_skb_parms *req);
215 extern void inet6_rt_notify(int event, struct rt6_info *rt,
216 struct nlmsghdr *nlh,
217 struct netlink_skb_parms *req);
219 extern void fib6_run_gc(unsigned long dummy);
221 extern void fib6_gc_cleanup(void);
223 extern void fib6_init(void);