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TOMOYO Linux Cross Reference
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 #ifdef __KERNEL__
 17 
 18 #include <linux/ipv6_route.h>
 19 #include <linux/rtnetlink.h>
 20 #include <linux/spinlock.h>
 21 #include <net/dst.h>
 22 #include <net/flow.h>
 23 #include <net/netlink.h>
 24 #include <net/inetpeer.h>
 25 
 26 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 27 #define FIB6_TABLE_HASHSZ 256
 28 #else
 29 #define FIB6_TABLE_HASHSZ 1
 30 #endif
 31 
 32 struct rt6_info;
 33 
 34 struct fib6_config {
 35         u32             fc_table;
 36         u32             fc_metric;
 37         int             fc_dst_len;
 38         int             fc_src_len;
 39         int             fc_ifindex;
 40         u32             fc_flags;
 41         u32             fc_protocol;
 42 
 43         struct in6_addr fc_dst;
 44         struct in6_addr fc_src;
 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 #define rt6i_dev                        dst.dev
 91 #define rt6i_nexthop                    dst.neighbour
 92 #define rt6i_expires                    dst.expires
 93 
 94         /*
 95          * Tail elements of dst_entry (__refcnt etc.)
 96          * and these elements (rarely used in hot path) are in
 97          * the same cache line.
 98          */
 99         struct fib6_table               *rt6i_table;
100         struct fib6_node                *rt6i_node;
101 
102         struct in6_addr                 rt6i_gateway;
103 
104         atomic_t                        rt6i_ref;
105 
106         /* These are in a separate cache line. */
107         struct rt6key                   rt6i_dst ____cacheline_aligned_in_smp;
108         u32                             rt6i_flags;
109         struct rt6key                   rt6i_src;
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 struct fib6_walker_t {
131         struct list_head lh;
132         struct fib6_node *root, *node;
133         struct rt6_info *leaf;
134         unsigned char state;
135         unsigned char prune;
136         unsigned int skip;
137         unsigned int count;
138         int (*func)(struct fib6_walker_t *);
139         void *args;
140 };
141 
142 struct rt6_statistics {
143         __u32           fib_nodes;
144         __u32           fib_route_nodes;
145         __u32           fib_rt_alloc;           /* permanent routes     */
146         __u32           fib_rt_entries;         /* rt entries in table  */
147         __u32           fib_rt_cache;           /* cache routes         */
148         __u32           fib_discarded_routes;
149 };
150 
151 #define RTN_TL_ROOT     0x0001
152 #define RTN_ROOT        0x0002          /* tree root node               */
153 #define RTN_RTINFO      0x0004          /* node with valid routing info */
154 
155 /*
156  *      priority levels (or metrics)
157  *
158  */
159 
160 
161 struct fib6_table {
162         struct hlist_node       tb6_hlist;
163         u32                     tb6_id;
164         rwlock_t                tb6_lock;
165         struct fib6_node        tb6_root;
166 };
167 
168 #define RT6_TABLE_UNSPEC        RT_TABLE_UNSPEC
169 #define RT6_TABLE_MAIN          RT_TABLE_MAIN
170 #define RT6_TABLE_DFLT          RT6_TABLE_MAIN
171 #define RT6_TABLE_INFO          RT6_TABLE_MAIN
172 #define RT6_TABLE_PREFIX        RT6_TABLE_MAIN
173 
174 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
175 #define FIB6_TABLE_MIN          1
176 #define FIB6_TABLE_MAX          RT_TABLE_MAX
177 #define RT6_TABLE_LOCAL         RT_TABLE_LOCAL
178 #else
179 #define FIB6_TABLE_MIN          RT_TABLE_MAIN
180 #define FIB6_TABLE_MAX          FIB6_TABLE_MIN
181 #define RT6_TABLE_LOCAL         RT6_TABLE_MAIN
182 #endif
183 
184 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
185                                          struct fib6_table *,
186                                          struct flowi6 *, int);
187 
188 /*
189  *      exported functions
190  */
191 
192 extern struct fib6_table        *fib6_get_table(struct net *net, u32 id);
193 extern struct fib6_table        *fib6_new_table(struct net *net, u32 id);
194 extern struct dst_entry         *fib6_rule_lookup(struct net *net,
195                                                   struct flowi6 *fl6, int flags,
196                                                   pol_lookup_t lookup);
197 
198 extern struct fib6_node         *fib6_lookup(struct fib6_node *root,
199                                              struct in6_addr *daddr,
200                                              struct in6_addr *saddr);
201 
202 struct fib6_node                *fib6_locate(struct fib6_node *root,
203                                              struct in6_addr *daddr, int dst_len,
204                                              struct in6_addr *saddr, int src_len);
205 
206 extern void                     fib6_clean_all(struct net *net,
207                                                int (*func)(struct rt6_info *, void *arg),
208                                                int prune, void *arg);
209 
210 extern int                      fib6_add(struct fib6_node *root,
211                                          struct rt6_info *rt,
212                                          struct nl_info *info);
213 
214 extern int                      fib6_del(struct rt6_info *rt,
215                                          struct nl_info *info);
216 
217 extern void                     inet6_rt_notify(int event, struct rt6_info *rt,
218                                                 struct nl_info *info);
219 
220 extern void                     fib6_run_gc(unsigned long expires,
221                                             struct net *net);
222 
223 extern void                     fib6_gc_cleanup(void);
224 
225 extern int                      fib6_init(void);
226 
227 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
228 extern int                      fib6_rules_init(void);
229 extern void                     fib6_rules_cleanup(void);
230 #else
231 static inline int               fib6_rules_init(void)
232 {
233         return 0;
234 }
235 static inline void              fib6_rules_cleanup(void)
236 {
237         return ;
238 }
239 #endif
240 #endif
241 #endif
242 

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