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 u16 fc_type; /* only 8 bits are used */
41 u16 fc_delete_all_nh : 1,
44 struct in6_addr fc_dst;
45 struct in6_addr fc_src;
46 struct in6_addr fc_prefsrc;
47 struct in6_addr fc_gateway;
49 unsigned long fc_expires;
55 struct nl_info fc_nlinfo;
56 struct nlattr *fc_encap;
61 struct fib6_node *parent;
62 struct fib6_node *left;
63 struct fib6_node *right;
64 #ifdef CONFIG_IPV6_SUBTREES
65 struct fib6_node *subtree;
67 struct rt6_info *leaf;
69 __u16 fn_bit; /* bit key */
72 struct rt6_info *rr_ptr;
76 #ifndef CONFIG_IPV6_SUBTREES
77 #define FIB6_SUBTREE(fn) NULL
79 #define FIB6_SUBTREE(fn) ((fn)->subtree)
84 DECLARE_BITMAP(mx_valid, RTAX_MAX);
100 struct dst_entry dst;
103 * Tail elements of dst_entry (__refcnt etc.)
104 * and these elements (rarely used in hot path) are in
105 * the same cache line.
107 struct fib6_table *rt6i_table;
108 struct fib6_node __rcu *rt6i_node;
110 struct in6_addr rt6i_gateway;
113 * siblings is a list of rt6_info that have the the same metric/weight,
114 * destination, but not the same gateway. nsiblings is just a cache
115 * to speed up lookup.
117 struct list_head rt6i_siblings;
118 unsigned int rt6i_nsiblings;
122 /* These are in a separate cache line. */
123 struct rt6key rt6i_dst ____cacheline_aligned_in_smp;
125 struct rt6key rt6i_src;
126 struct rt6key rt6i_prefsrc;
128 struct list_head rt6i_uncached;
129 struct uncached_list *rt6i_uncached_list;
131 struct inet6_dev *rt6i_idev;
132 struct rt6_info * __percpu *rt6i_pcpu;
136 /* more non-fragment space at head required */
137 unsigned short rt6i_nfheader_len;
141 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
143 return ((struct rt6_info *)dst)->rt6i_idev;
146 static inline void rt6_clean_expires(struct rt6_info *rt)
148 rt->rt6i_flags &= ~RTF_EXPIRES;
152 static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
154 rt->dst.expires = expires;
155 rt->rt6i_flags |= RTF_EXPIRES;
158 static inline void rt6_update_expires(struct rt6_info *rt0, int timeout)
162 for (rt = rt0; rt && !(rt->rt6i_flags & RTF_EXPIRES);
163 rt = (struct rt6_info *)rt->dst.from);
165 rt0->dst.expires = rt->dst.expires;
167 dst_set_expires(&rt0->dst, timeout);
168 rt0->rt6i_flags |= RTF_EXPIRES;
171 /* Function to safely get fn->sernum for passed in rt
172 * and store result in passed in cookie.
173 * Return true if we can get cookie safely
174 * Return false if not
176 static inline bool rt6_get_cookie_safe(const struct rt6_info *rt,
179 struct fib6_node *fn;
183 fn = rcu_dereference(rt->rt6i_node);
186 *cookie = fn->fn_sernum;
194 static inline u32 rt6_get_cookie(const struct rt6_info *rt)
198 if (rt->rt6i_flags & RTF_PCPU ||
199 (unlikely(!list_empty(&rt->rt6i_uncached)) && rt->dst.from))
200 rt = (struct rt6_info *)(rt->dst.from);
202 rt6_get_cookie_safe(rt, &cookie);
207 static inline void ip6_rt_put(struct rt6_info *rt)
209 /* dst_release() accepts a NULL parameter.
210 * We rely on dst being first structure in struct rt6_info
212 BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);
213 dst_release(&rt->dst);
216 enum fib6_walk_state {
217 #ifdef CONFIG_IPV6_SUBTREES
228 struct fib6_node *root, *node;
229 struct rt6_info *leaf;
230 enum fib6_walk_state state;
234 int (*func)(struct fib6_walker *);
238 struct rt6_statistics {
240 __u32 fib_route_nodes;
241 __u32 fib_rt_alloc; /* permanent routes */
242 __u32 fib_rt_entries; /* rt entries in table */
243 __u32 fib_rt_cache; /* cache routes */
244 __u32 fib_discarded_routes;
247 #define RTN_TL_ROOT 0x0001
248 #define RTN_ROOT 0x0002 /* tree root node */
249 #define RTN_RTINFO 0x0004 /* node with valid routing info */
252 * priority levels (or metrics)
258 struct hlist_node tb6_hlist;
261 struct fib6_node tb6_root;
262 struct inet_peer_base tb6_peers;
264 #define RT6_TABLE_HAS_DFLT_ROUTER BIT(0)
267 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
268 #define RT6_TABLE_MAIN RT_TABLE_MAIN
269 #define RT6_TABLE_DFLT RT6_TABLE_MAIN
270 #define RT6_TABLE_INFO RT6_TABLE_MAIN
271 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN
273 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
274 #define FIB6_TABLE_MIN 1
275 #define FIB6_TABLE_MAX RT_TABLE_MAX
276 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL
278 #define FIB6_TABLE_MIN RT_TABLE_MAIN
279 #define FIB6_TABLE_MAX FIB6_TABLE_MIN
280 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN
283 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
285 struct flowi6 *, int);
291 struct fib6_table *fib6_get_table(struct net *net, u32 id);
292 struct fib6_table *fib6_new_table(struct net *net, u32 id);
293 struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
294 int flags, pol_lookup_t lookup);
296 struct fib6_node *fib6_lookup(struct fib6_node *root,
297 const struct in6_addr *daddr,
298 const struct in6_addr *saddr);
300 struct fib6_node *fib6_locate(struct fib6_node *root,
301 const struct in6_addr *daddr, int dst_len,
302 const struct in6_addr *saddr, int src_len);
304 void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
307 int fib6_add(struct fib6_node *root, struct rt6_info *rt,
308 struct nl_info *info, struct mx6_config *mxc,
309 struct netlink_ext_ack *extack);
310 int fib6_del(struct rt6_info *rt, struct nl_info *info);
312 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
315 void fib6_run_gc(unsigned long expires, struct net *net, bool force);
317 void fib6_gc_cleanup(void);
321 int ipv6_route_open(struct inode *inode, struct file *file);
323 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
324 int fib6_rules_init(void);
325 void fib6_rules_cleanup(void);
327 static inline int fib6_rules_init(void)
331 static inline void fib6_rules_cleanup(void)