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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         u32             fc_type;        /* only 8 bits are used */
 41 
 42         struct in6_addr fc_dst;
 43         struct in6_addr fc_src;
 44         struct in6_addr fc_prefsrc;
 45         struct in6_addr fc_gateway;
 46 
 47         unsigned long   fc_expires;
 48         struct nlattr   *fc_mx;
 49         int             fc_mx_len;
 50 
 51         struct nl_info  fc_nlinfo;
 52 };
 53 
 54 struct fib6_node {
 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;
 60 #endif
 61         struct rt6_info         *leaf;
 62 
 63         __u16                   fn_bit;         /* bit key */
 64         __u16                   fn_flags;
 65         __u32                   fn_sernum;
 66         struct rt6_info         *rr_ptr;
 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         /*
 91          * Tail elements of dst_entry (__refcnt etc.)
 92          * and these elements (rarely used in hot path) are in
 93          * the same cache line.
 94          */
 95         struct fib6_table               *rt6i_table;
 96         struct fib6_node                *rt6i_node;
 97 
 98         struct in6_addr                 rt6i_gateway;
 99 
100         atomic_t                        rt6i_ref;
101 
102         /* These are in a separate cache line. */
103         struct rt6key                   rt6i_dst ____cacheline_aligned_in_smp;
104         u32                             rt6i_flags;
105         struct rt6key                   rt6i_src;
106         struct rt6key                   rt6i_prefsrc;
107         u32                             rt6i_metric;
108         u32                             rt6i_peer_genid;
109 
110         struct inet6_dev                *rt6i_idev;
111         struct inet_peer                *rt6i_peer;
112 
113 #ifdef CONFIG_XFRM
114         u32                             rt6i_flow_cache_genid;
115 #endif
116         /* more non-fragment space at head required */
117         unsigned short                  rt6i_nfheader_len;
118 
119         u8                              rt6i_protocol;
120 };
121 
122 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
123 {
124         return ((struct rt6_info *)dst)->rt6i_idev;
125 }
126 
127 static inline void rt6_clean_expires(struct rt6_info *rt)
128 {
129         if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
130                 dst_release(rt->dst.from);
131 
132         rt->rt6i_flags &= ~RTF_EXPIRES;
133         rt->dst.from = NULL;
134 }
135 
136 static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
137 {
138         if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
139                 dst_release(rt->dst.from);
140 
141         rt->rt6i_flags |= RTF_EXPIRES;
142         rt->dst.expires = expires;
143 }
144 
145 static inline void rt6_update_expires(struct rt6_info *rt, int timeout)
146 {
147         if (!(rt->rt6i_flags & RTF_EXPIRES)) {
148                 if (rt->dst.from)
149                         dst_release(rt->dst.from);
150                 /* dst_set_expires relies on expires == 0 
151                  * if it has not been set previously.
152                  */
153                 rt->dst.expires = 0;
154         }
155 
156         dst_set_expires(&rt->dst, timeout);
157         rt->rt6i_flags |= RTF_EXPIRES;
158 }
159 
160 static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
161 {
162         struct dst_entry *new = (struct dst_entry *) from;
163 
164         if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) {
165                 if (new == rt->dst.from)
166                         return;
167                 dst_release(rt->dst.from);
168         }
169 
170         rt->rt6i_flags &= ~RTF_EXPIRES;
171         rt->dst.from = new;
172         dst_hold(new);
173 }
174 
175 struct fib6_walker_t {
176         struct list_head lh;
177         struct fib6_node *root, *node;
178         struct rt6_info *leaf;
179         unsigned char state;
180         unsigned char prune;
181         unsigned int skip;
182         unsigned int count;
183         int (*func)(struct fib6_walker_t *);
184         void *args;
185 };
186 
187 struct rt6_statistics {
188         __u32           fib_nodes;
189         __u32           fib_route_nodes;
190         __u32           fib_rt_alloc;           /* permanent routes     */
191         __u32           fib_rt_entries;         /* rt entries in table  */
192         __u32           fib_rt_cache;           /* cache routes         */
193         __u32           fib_discarded_routes;
194 };
195 
196 #define RTN_TL_ROOT     0x0001
197 #define RTN_ROOT        0x0002          /* tree root node               */
198 #define RTN_RTINFO      0x0004          /* node with valid routing info */
199 
200 /*
201  *      priority levels (or metrics)
202  *
203  */
204 
205 
206 struct fib6_table {
207         struct hlist_node       tb6_hlist;
208         u32                     tb6_id;
209         rwlock_t                tb6_lock;
210         struct fib6_node        tb6_root;
211 };
212 
213 #define RT6_TABLE_UNSPEC        RT_TABLE_UNSPEC
214 #define RT6_TABLE_MAIN          RT_TABLE_MAIN
215 #define RT6_TABLE_DFLT          RT6_TABLE_MAIN
216 #define RT6_TABLE_INFO          RT6_TABLE_MAIN
217 #define RT6_TABLE_PREFIX        RT6_TABLE_MAIN
218 
219 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
220 #define FIB6_TABLE_MIN          1
221 #define FIB6_TABLE_MAX          RT_TABLE_MAX
222 #define RT6_TABLE_LOCAL         RT_TABLE_LOCAL
223 #else
224 #define FIB6_TABLE_MIN          RT_TABLE_MAIN
225 #define FIB6_TABLE_MAX          FIB6_TABLE_MIN
226 #define RT6_TABLE_LOCAL         RT6_TABLE_MAIN
227 #endif
228 
229 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
230                                          struct fib6_table *,
231                                          struct flowi6 *, int);
232 
233 /*
234  *      exported functions
235  */
236 
237 extern struct fib6_table        *fib6_get_table(struct net *net, u32 id);
238 extern struct fib6_table        *fib6_new_table(struct net *net, u32 id);
239 extern struct dst_entry         *fib6_rule_lookup(struct net *net,
240                                                   struct flowi6 *fl6, int flags,
241                                                   pol_lookup_t lookup);
242 
243 extern struct fib6_node         *fib6_lookup(struct fib6_node *root,
244                                              const struct in6_addr *daddr,
245                                              const struct in6_addr *saddr);
246 
247 struct fib6_node                *fib6_locate(struct fib6_node *root,
248                                              const struct in6_addr *daddr, int dst_len,
249                                              const struct in6_addr *saddr, int src_len);
250 
251 extern void                     fib6_clean_all_ro(struct net *net,
252                                                int (*func)(struct rt6_info *, void *arg),
253                                                int prune, void *arg);
254 
255 extern void                     fib6_clean_all(struct net *net,
256                                                int (*func)(struct rt6_info *, void *arg),
257                                                int prune, void *arg);
258 
259 extern int                      fib6_add(struct fib6_node *root,
260                                          struct rt6_info *rt,
261                                          struct nl_info *info);
262 
263 extern int                      fib6_del(struct rt6_info *rt,
264                                          struct nl_info *info);
265 
266 extern void                     inet6_rt_notify(int event, struct rt6_info *rt,
267                                                 struct nl_info *info);
268 
269 extern void                     fib6_run_gc(unsigned long expires,
270                                             struct net *net, bool force);
271 
272 extern void                     fib6_gc_cleanup(void);
273 
274 extern int                      fib6_init(void);
275 
276 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
277 extern int                      fib6_rules_init(void);
278 extern void                     fib6_rules_cleanup(void);
279 #else
280 static inline int               fib6_rules_init(void)
281 {
282         return 0;
283 }
284 static inline void              fib6_rules_cleanup(void)
285 {
286         return ;
287 }
288 #endif
289 #endif
290 

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