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)
79 DECLARE_BITMAP(mx_valid, RTAX_MAX);
98 * Tail elements of dst_entry (__refcnt etc.)
99 * and these elements (rarely used in hot path) are in
100 * the same cache line.
102 struct fib6_table *rt6i_table;
103 struct fib6_node *rt6i_node;
105 struct in6_addr rt6i_gateway;
108 * siblings is a list of rt6_info that have the the same metric/weight,
109 * destination, but not the same gateway. nsiblings is just a cache
110 * to speed up lookup.
112 struct list_head rt6i_siblings;
113 unsigned int rt6i_nsiblings;
117 /* These are in a separate cache line. */
118 struct rt6key rt6i_dst ____cacheline_aligned_in_smp;
120 struct rt6key rt6i_src;
121 struct rt6key rt6i_prefsrc;
123 struct inet6_dev *rt6i_idev;
127 /* more non-fragment space at head required */
128 unsigned short rt6i_nfheader_len;
132 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
134 return ((struct rt6_info *)dst)->rt6i_idev;
137 static inline void rt6_clean_expires(struct rt6_info *rt)
139 rt->rt6i_flags &= ~RTF_EXPIRES;
143 static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
145 rt->dst.expires = expires;
146 rt->rt6i_flags |= RTF_EXPIRES;
149 static inline void rt6_update_expires(struct rt6_info *rt0, int timeout)
153 for (rt = rt0; rt && !(rt->rt6i_flags & RTF_EXPIRES);
154 rt = (struct rt6_info *)rt->dst.from);
156 rt0->dst.expires = rt->dst.expires;
158 dst_set_expires(&rt0->dst, timeout);
159 rt0->rt6i_flags |= RTF_EXPIRES;
162 static inline void ip6_rt_put(struct rt6_info *rt)
164 /* dst_release() accepts a NULL parameter.
165 * We rely on dst being first structure in struct rt6_info
167 BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);
168 dst_release(&rt->dst);
171 enum fib6_walk_state {
172 #ifdef CONFIG_IPV6_SUBTREES
183 struct fib6_node *root, *node;
184 struct rt6_info *leaf;
185 enum fib6_walk_state state;
189 int (*func)(struct fib6_walker *);
193 struct rt6_statistics {
195 __u32 fib_route_nodes;
196 __u32 fib_rt_alloc; /* permanent routes */
197 __u32 fib_rt_entries; /* rt entries in table */
198 __u32 fib_rt_cache; /* cache routes */
199 __u32 fib_discarded_routes;
202 #define RTN_TL_ROOT 0x0001
203 #define RTN_ROOT 0x0002 /* tree root node */
204 #define RTN_RTINFO 0x0004 /* node with valid routing info */
207 * priority levels (or metrics)
213 struct hlist_node tb6_hlist;
216 struct fib6_node tb6_root;
217 struct inet_peer_base tb6_peers;
220 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
221 #define RT6_TABLE_MAIN RT_TABLE_MAIN
222 #define RT6_TABLE_DFLT RT6_TABLE_MAIN
223 #define RT6_TABLE_INFO RT6_TABLE_MAIN
224 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN
226 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
227 #define FIB6_TABLE_MIN 1
228 #define FIB6_TABLE_MAX RT_TABLE_MAX
229 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL
231 #define FIB6_TABLE_MIN RT_TABLE_MAIN
232 #define FIB6_TABLE_MAX FIB6_TABLE_MIN
233 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN
236 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
238 struct flowi6 *, int);
244 struct fib6_table *fib6_get_table(struct net *net, u32 id);
245 struct fib6_table *fib6_new_table(struct net *net, u32 id);
246 struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
247 int flags, pol_lookup_t lookup);
249 struct fib6_node *fib6_lookup(struct fib6_node *root,
250 const struct in6_addr *daddr,
251 const struct in6_addr *saddr);
253 struct fib6_node *fib6_locate(struct fib6_node *root,
254 const struct in6_addr *daddr, int dst_len,
255 const struct in6_addr *saddr, int src_len);
257 void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
260 int fib6_add(struct fib6_node *root, struct rt6_info *rt,
261 struct nl_info *info, struct mx6_config *mxc);
262 int fib6_del(struct rt6_info *rt, struct nl_info *info);
264 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info);
266 void fib6_run_gc(unsigned long expires, struct net *net, bool force);
268 void fib6_gc_cleanup(void);
272 int ipv6_route_open(struct inode *inode, struct file *file);
274 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
275 int fib6_rules_init(void);
276 void fib6_rules_cleanup(void);
278 static inline int fib6_rules_init(void)
282 static inline void fib6_rules_cleanup(void)