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Linux/include/net/ip6_fib.h

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  1 /*
  2  *      Linux INET6 implementation 
  3  *
  4  *      Authors:
  5  *      Pedro Roque             <roque@di.fc.ul.pt>     
  6  *
  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.
 11  */
 12 
 13 #ifndef _IP6_FIB_H
 14 #define _IP6_FIB_H
 15 
 16 #include <linux/ipv6_route.h>
 17 #include <linux/rtnetlink.h>
 18 #include <linux/spinlock.h>
 19 #include <net/dst.h>
 20 #include <net/flow.h>
 21 #include <net/netlink.h>
 22 #include <net/inetpeer.h>
 23 
 24 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 25 #define FIB6_TABLE_HASHSZ 256
 26 #else
 27 #define FIB6_TABLE_HASHSZ 1
 28 #endif
 29 
 30 struct rt6_info;
 31 
 32 struct fib6_config {
 33         u32             fc_table;
 34         u32             fc_metric;
 35         int             fc_dst_len;
 36         int             fc_src_len;
 37         int             fc_ifindex;
 38         u32             fc_flags;
 39         u32             fc_protocol;
 40 
 41         struct in6_addr fc_dst;
 42         struct in6_addr fc_src;
 43         struct in6_addr fc_prefsrc;
 44         struct in6_addr fc_gateway;
 45 
 46         unsigned long   fc_expires;
 47         struct nlattr   *fc_mx;
 48         int             fc_mx_len;
 49 
 50         struct nl_info  fc_nlinfo;
 51 };
 52 
 53 struct fib6_node {
 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;
 59 #endif
 60         struct rt6_info         *leaf;
 61 
 62         __u16                   fn_bit;         /* bit key */
 63         __u16                   fn_flags;
 64         __u32                   fn_sernum;
 65         struct rt6_info         *rr_ptr;
 66         struct rcu_head         rcu;
 67 };
 68 
 69 #ifndef CONFIG_IPV6_SUBTREES
 70 #define FIB6_SUBTREE(fn)        NULL
 71 #else
 72 #define FIB6_SUBTREE(fn)        ((fn)->subtree)
 73 #endif
 74 
 75 /*
 76  *      routing information
 77  *
 78  */
 79 
 80 struct rt6key {
 81         struct in6_addr addr;
 82         int             plen;
 83 };
 84 
 85 struct fib6_table;
 86 
 87 struct rt6_info {
 88         struct dst_entry                dst;
 89 
 90 #define rt6i_dev                        dst.dev
 91 #define rt6i_expires                    dst.expires
 92 
 93         /*
 94          * Tail elements of dst_entry (__refcnt etc.)
 95          * and these elements (rarely used in hot path) are in
 96          * the same cache line.
 97          */
 98         struct fib6_table               *rt6i_table;
 99         struct fib6_node __rcu          *rt6i_node;
100 
101         struct in6_addr                 rt6i_gateway;
102 
103         atomic_t                        rt6i_ref;
104 
105         /* These are in a separate cache line. */
106         struct rt6key                   rt6i_dst ____cacheline_aligned_in_smp;
107         u32                             rt6i_flags;
108         struct rt6key                   rt6i_src;
109         struct rt6key                   rt6i_prefsrc;
110         u32                             rt6i_metric;
111         u32                             rt6i_peer_genid;
112 
113         struct inet6_dev                *rt6i_idev;
114         struct inet_peer                *rt6i_peer;
115 
116 #ifdef CONFIG_XFRM
117         u32                             rt6i_flow_cache_genid;
118 #endif
119         /* more non-fragment space at head required */
120         unsigned short                  rt6i_nfheader_len;
121 
122         u8                              rt6i_protocol;
123 };
124 
125 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
126 {
127         return ((struct rt6_info *)dst)->rt6i_idev;
128 }
129 
130 /* Function to safely get fn->sernum for passed in rt
131  * and store result in passed in cookie.
132  * Return true if we can get cookie safely
133  * Return false if not
134  */
135 static inline bool rt6_get_cookie_safe(const struct rt6_info *rt,
136                                        u32 *cookie)
137 {
138         struct fib6_node *fn;
139         bool status = false;
140 
141         rcu_read_lock();
142         fn = rcu_dereference(rt->rt6i_node);
143 
144         if (fn) {
145                 *cookie = fn->fn_sernum;
146                 status = true;
147         }
148 
149         rcu_read_unlock();
150         return status;
151 }
152 
153 static inline u32 rt6_get_cookie(const struct rt6_info *rt)
154 {
155         u32 cookie = 0;
156 
157         rt6_get_cookie_safe(rt, &cookie);
158 
159         return cookie;
160 }
161 
162 struct fib6_walker_t {
163         struct list_head lh;
164         struct fib6_node *root, *node;
165         struct rt6_info *leaf;
166         unsigned char state;
167         unsigned char prune;
168         unsigned int skip;
169         unsigned int count;
170         int (*func)(struct fib6_walker_t *);
171         void *args;
172 };
173 
174 struct rt6_statistics {
175         __u32           fib_nodes;
176         __u32           fib_route_nodes;
177         __u32           fib_rt_alloc;           /* permanent routes     */
178         __u32           fib_rt_entries;         /* rt entries in table  */
179         __u32           fib_rt_cache;           /* cache routes         */
180         __u32           fib_discarded_routes;
181 };
182 
183 #define RTN_TL_ROOT     0x0001
184 #define RTN_ROOT        0x0002          /* tree root node               */
185 #define RTN_RTINFO      0x0004          /* node with valid routing info */
186 
187 /*
188  *      priority levels (or metrics)
189  *
190  */
191 
192 
193 struct fib6_table {
194         struct hlist_node       tb6_hlist;
195         u32                     tb6_id;
196         rwlock_t                tb6_lock;
197         struct fib6_node        tb6_root;
198 };
199 
200 #define RT6_TABLE_UNSPEC        RT_TABLE_UNSPEC
201 #define RT6_TABLE_MAIN          RT_TABLE_MAIN
202 #define RT6_TABLE_DFLT          RT6_TABLE_MAIN
203 #define RT6_TABLE_INFO          RT6_TABLE_MAIN
204 #define RT6_TABLE_PREFIX        RT6_TABLE_MAIN
205 
206 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
207 #define FIB6_TABLE_MIN          1
208 #define FIB6_TABLE_MAX          RT_TABLE_MAX
209 #define RT6_TABLE_LOCAL         RT_TABLE_LOCAL
210 #else
211 #define FIB6_TABLE_MIN          RT_TABLE_MAIN
212 #define FIB6_TABLE_MAX          FIB6_TABLE_MIN
213 #define RT6_TABLE_LOCAL         RT6_TABLE_MAIN
214 #endif
215 
216 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
217                                          struct fib6_table *,
218                                          struct flowi6 *, int);
219 
220 /*
221  *      exported functions
222  */
223 
224 extern struct fib6_table        *fib6_get_table(struct net *net, u32 id);
225 extern struct fib6_table        *fib6_new_table(struct net *net, u32 id);
226 extern struct dst_entry         *fib6_rule_lookup(struct net *net,
227                                                   struct flowi6 *fl6, int flags,
228                                                   pol_lookup_t lookup);
229 
230 extern struct fib6_node         *fib6_lookup(struct fib6_node *root,
231                                              const struct in6_addr *daddr,
232                                              const struct in6_addr *saddr);
233 
234 struct fib6_node                *fib6_locate(struct fib6_node *root,
235                                              const struct in6_addr *daddr, int dst_len,
236                                              const struct in6_addr *saddr, int src_len);
237 
238 extern void                     fib6_clean_all(struct net *net,
239                                                int (*func)(struct rt6_info *, void *arg),
240                                                int prune, void *arg);
241 
242 extern int                      fib6_add(struct fib6_node *root,
243                                          struct rt6_info *rt,
244                                          struct nl_info *info);
245 
246 extern int                      fib6_del(struct rt6_info *rt,
247                                          struct nl_info *info);
248 
249 extern void                     inet6_rt_notify(int event, struct rt6_info *rt,
250                                                 struct nl_info *info);
251 
252 extern void                     fib6_run_gc(unsigned long expires,
253                                             struct net *net, bool force);
254 
255 extern void                     fib6_gc_cleanup(void);
256 
257 extern int                      fib6_init(void);
258 
259 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
260 extern int                      fib6_rules_init(void);
261 extern void                     fib6_rules_cleanup(void);
262 #else
263 static inline int               fib6_rules_init(void)
264 {
265         return 0;
266 }
267 static inline void              fib6_rules_cleanup(void)
268 {
269         return ;
270 }
271 #endif
272 #endif
273 

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