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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 #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 
 25 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 26 #define FIB6_TABLE_HASHSZ 256
 27 #else
 28 #define FIB6_TABLE_HASHSZ 1
 29 #endif
 30 
 31 struct rt6_info;
 32 
 33 struct fib6_config {
 34         u32             fc_table;
 35         u32             fc_metric;
 36         int             fc_dst_len;
 37         int             fc_src_len;
 38         int             fc_ifindex;
 39         u32             fc_flags;
 40         u32             fc_protocol;
 41 
 42         struct in6_addr fc_dst;
 43         struct in6_addr fc_src;
 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 };
 67 
 68 #ifndef CONFIG_IPV6_SUBTREES
 69 #define FIB6_SUBTREE(fn)        NULL
 70 #else
 71 #define FIB6_SUBTREE(fn)        ((fn)->subtree)
 72 #endif
 73 
 74 /*
 75  *      routing information
 76  *
 77  */
 78 
 79 struct rt6key {
 80         struct in6_addr addr;
 81         int             plen;
 82 };
 83 
 84 struct fib6_table;
 85 
 86 struct rt6_info {
 87         union {
 88                 struct dst_entry        dst;
 89         } u;
 90 
 91         struct inet6_dev                *rt6i_idev;
 92 
 93 #define rt6i_dev                        u.dst.dev
 94 #define rt6i_nexthop                    u.dst.neighbour
 95 #define rt6i_expires                    u.dst.expires
 96 
 97         struct fib6_node                *rt6i_node;
 98 
 99         struct in6_addr                 rt6i_gateway;
100         
101         u32                             rt6i_flags;
102         u32                             rt6i_metric;
103         atomic_t                        rt6i_ref;
104 
105         /* more non-fragment space at head required */
106         unsigned short                  rt6i_nfheader_len;
107 
108         u8                              rt6i_protocol;
109 
110         struct fib6_table               *rt6i_table;
111 
112         struct rt6key                   rt6i_dst;
113 
114 #ifdef CONFIG_XFRM
115         u32                             rt6i_flow_cache_genid;
116 #endif
117 
118         struct rt6key                   rt6i_src;
119 };
120 
121 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
122 {
123         return ((struct rt6_info *)dst)->rt6i_idev;
124 }
125 
126 struct fib6_walker_t {
127         struct list_head lh;
128         struct fib6_node *root, *node;
129         struct rt6_info *leaf;
130         unsigned char state;
131         unsigned char prune;
132         unsigned int skip;
133         unsigned int count;
134         int (*func)(struct fib6_walker_t *);
135         void *args;
136 };
137 
138 struct rt6_statistics {
139         __u32           fib_nodes;
140         __u32           fib_route_nodes;
141         __u32           fib_rt_alloc;           /* permanent routes     */
142         __u32           fib_rt_entries;         /* rt entries in table  */
143         __u32           fib_rt_cache;           /* cache routes         */
144         __u32           fib_discarded_routes;
145 };
146 
147 #define RTN_TL_ROOT     0x0001
148 #define RTN_ROOT        0x0002          /* tree root node               */
149 #define RTN_RTINFO      0x0004          /* node with valid routing info */
150 
151 /*
152  *      priority levels (or metrics)
153  *
154  */
155 
156 
157 struct fib6_table {
158         struct hlist_node       tb6_hlist;
159         u32                     tb6_id;
160         rwlock_t                tb6_lock;
161         struct fib6_node        tb6_root;
162 };
163 
164 #define RT6_TABLE_UNSPEC        RT_TABLE_UNSPEC
165 #define RT6_TABLE_MAIN          RT_TABLE_MAIN
166 #define RT6_TABLE_DFLT          RT6_TABLE_MAIN
167 #define RT6_TABLE_INFO          RT6_TABLE_MAIN
168 #define RT6_TABLE_PREFIX        RT6_TABLE_MAIN
169 
170 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
171 #define FIB6_TABLE_MIN          1
172 #define FIB6_TABLE_MAX          RT_TABLE_MAX
173 #define RT6_TABLE_LOCAL         RT_TABLE_LOCAL
174 #else
175 #define FIB6_TABLE_MIN          RT_TABLE_MAIN
176 #define FIB6_TABLE_MAX          FIB6_TABLE_MIN
177 #define RT6_TABLE_LOCAL         RT6_TABLE_MAIN
178 #endif
179 
180 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
181                                          struct fib6_table *,
182                                          struct flowi *, int);
183 
184 /*
185  *      exported functions
186  */
187 
188 extern struct fib6_table        *fib6_get_table(struct net *net, u32 id);
189 extern struct fib6_table        *fib6_new_table(struct net *net, u32 id);
190 extern struct dst_entry         *fib6_rule_lookup(struct net *net,
191                                                   struct flowi *fl, int flags,
192                                                   pol_lookup_t lookup);
193 
194 extern struct fib6_node         *fib6_lookup(struct fib6_node *root,
195                                              struct in6_addr *daddr,
196                                              struct in6_addr *saddr);
197 
198 struct fib6_node                *fib6_locate(struct fib6_node *root,
199                                              struct in6_addr *daddr, int dst_len,
200                                              struct in6_addr *saddr, int src_len);
201 
202 extern void                     fib6_clean_all(struct net *net,
203                                                int (*func)(struct rt6_info *, void *arg),
204                                                int prune, void *arg);
205 
206 extern int                      fib6_add(struct fib6_node *root,
207                                          struct rt6_info *rt,
208                                          struct nl_info *info);
209 
210 extern int                      fib6_del(struct rt6_info *rt,
211                                          struct nl_info *info);
212 
213 extern void                     inet6_rt_notify(int event, struct rt6_info *rt,
214                                                 struct nl_info *info);
215 
216 extern void                     fib6_run_gc(unsigned long expires,
217                                             struct net *net);
218 
219 extern void                     fib6_gc_cleanup(void);
220 
221 extern int                      fib6_init(void);
222 
223 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
224 extern int                      fib6_rules_init(void);
225 extern void                     fib6_rules_cleanup(void);
226 #else
227 static inline int               fib6_rules_init(void)
228 {
229         return 0;
230 }
231 static inline void              fib6_rules_cleanup(void)
232 {
233         return ;
234 }
235 #endif
236 #endif
237 #endif
238 

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