include/net2/ip6_fib.h

   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
  20 #include <net/dst.h>
  21 #include <net/flow.h>
  22 #include <linux/rtnetlink.h>
  23
  24 struct rt6_info;
  25
  26 struct fib6_node
  27 {
  28         struct fib6_node        *parent;
  29         struct fib6_node        *left;
  30         struct fib6_node        *right;
  31
  32         struct fib6_node        *subtree;
  33
  34         struct rt6_info         *leaf;
  35
  36         __u16                   fn_bit;         /* bit key */
  37         __u16                   fn_flags;
  38         __u32                   fn_sernum;
  39 };
  40
  41
  42 /*
  43  *      routing information
  44  *
  45  */
  46
  47 struct rt6key
  48 {
  49         struct in6_addr addr;
  50         int             plen;
  51 };
  52
  53 struct rt6_info
  54 {
  55         union {
  56                 struct dst_entry        dst;
  57                 struct rt6_info         *next;
  58         } u;
  59
  60 #define rt6i_dev                        u.dst.dev
  61 #define rt6i_nexthop                    u.dst.neighbour
  62 #define rt6i_expires                    u.dst.expires
  63
  64         struct fib6_node                *rt6i_node;
  65
  66         struct in6_addr                 rt6i_gateway;
  67
  68         u32                             rt6i_flags;
  69         u32                             rt6i_metric;
  70         u8                              rt6i_hoplimit;
  71         atomic_t                        rt6i_ref;
  72
  73         union {
  74                 struct flow_rule        *rt6iu_flowr;
  75                 struct flow_filter      *rt6iu_filter;
  76         } flow_u;
  77
  78 #define rt6i_flowr                      flow_u.rt6iu_flowr
  79 #define rt6i_filter                     flow_u.rt6iu_filter
  80
  81         struct rt6key                   rt6i_dst;
  82         struct rt6key                   rt6i_src;
  83 };
  84
  85 struct fib6_walker_t
  86 {
  87         struct fib6_walker_t *prev, *next;
  88         struct fib6_node *root, *node;
  89         struct rt6_info *leaf;
  90         unsigned char state;
  91         unsigned char prune;
  92         int (*func)(struct fib6_walker_t *);
  93         void *args;
  94 };
  95
  96 extern struct fib6_walker_t fib6_walker_list;
  97 extern rwlock_t fib6_walker_lock;
  98
  99 static inline void fib6_walker_link(struct fib6_walker_t *w)
 100 {
 101         write_lock_bh(&fib6_walker_lock);
 102         w->next = fib6_walker_list.next;
 103         w->prev = &fib6_walker_list;
 104         w->next->prev = w;
 105         w->prev->next = w;
 106         write_unlock_bh(&fib6_walker_lock);
 107 }
 108
 109 static inline void fib6_walker_unlink(struct fib6_walker_t *w)
 110 {
 111         write_lock_bh(&fib6_walker_lock);
 112         w->next->prev = w->prev;
 113         w->prev->next = w->next;
 114         w->prev = w->next = w;
 115         write_unlock_bh(&fib6_walker_lock);
 116 }
 117
 118 struct rt6_statistics {
 119         __u32           fib_nodes;
 120         __u32           fib_route_nodes;
 121         __u32           fib_rt_alloc;           /* permanet routes      */
 122         __u32           fib_rt_entries;         /* rt entries in table  */
 123         __u32           fib_rt_cache;           /* cache routes         */
 124 };
 125
 126 #define RTN_TL_ROOT     0x0001
 127 #define RTN_ROOT        0x0002          /* tree root node               */
 128 #define RTN_RTINFO      0x0004          /* node with valid routing info */
 129
 130 /*
 131  *      priority levels (or metrics)
 132  *
 133  */
 134
 135 #define RTPRI_FIREWALL  8               /* Firewall control information */
 136 #define RTPRI_FLOW      16              /* Flow based forwarding rules  */
 137 #define RTPRI_KERN_CTL  32              /* Kernel control routes        */
 138
 139 #define RTPRI_USER_MIN  256             /* Mimimum user priority        */
 140 #define RTPRI_USER_MAX  1024            /* Maximum user priority        */
 141
 142 #define RTPRI_KERN_DFLT 4096            /* Kernel default routes        */
 143
 144 #define MAX_FLOW_BACKTRACE      32
 145
 146
 147 typedef void                    (*f_pnode)(struct fib6_node *fn, void *);
 148
 149 extern struct fib6_node         ip6_routing_table;
 150
 151 /*
 152  *      exported functions
 153  */
 154
 155 extern struct fib6_node         *fib6_lookup(struct fib6_node *root,
 156                                              struct in6_addr *daddr,
 157                                              struct in6_addr *saddr);
 158
 159 struct fib6_node                *fib6_locate(struct fib6_node *root,
 160                                              struct in6_addr *daddr, int dst_len,
 161                                              struct in6_addr *saddr, int src_len);
 162
 163 extern void                     fib6_clean_tree(struct fib6_node *root,
 164                                                 int (*func)(struct rt6_info *, void *arg),
 165                                                 int prune, void *arg);
 166
 167 extern int                      fib6_walk(struct fib6_walker_t *w);
 168 extern int                      fib6_walk_continue(struct fib6_walker_t *w);
 169
 170 extern int                      fib6_add(struct fib6_node *root,
 171                                          struct rt6_info *rt);
 172
 173 extern int                      fib6_del(struct rt6_info *rt);
 174
 175 extern void                     inet6_rt_notify(int event, struct rt6_info *rt);
 176
 177 extern void                     fib6_run_gc(unsigned long dummy);
 178
 179 extern void                     fib6_gc_cleanup(void);
 180
 181 extern void                     fib6_init(void);
 182 #endif
 183 #endif