include/net/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 #include <linux/spinlock.h>
  24
  25 struct rt6_info;
  26
  27 struct fib6_node
  28 {
  29         struct fib6_node        *parent;
  30         struct fib6_node        *left;
  31         struct fib6_node        *right;
  32
  33         struct fib6_node        *subtree;
  34
  35         struct rt6_info         *leaf;
  36
  37         __u16                   fn_bit;         /* bit key */
  38         __u16                   fn_flags;
  39         __u32                   fn_sernum;
  40 };
  41
  42
  43 /*
  44  *      routing information
  45  *
  46  */
  47
  48 struct rt6key
  49 {
  50         struct in6_addr addr;
  51         int             plen;
  52 };
  53
  54 struct rt6_info
  55 {
  56         union {
  57                 struct dst_entry        dst;
  58                 struct rt6_info         *next;
  59         } u;
  60
  61         struct inet6_dev                *rt6i_idev;
  62
  63 #define rt6i_dev                        u.dst.dev
  64 #define rt6i_nexthop                    u.dst.neighbour
  65 #define rt6i_expires                    u.dst.expires
  66
  67         struct fib6_node                *rt6i_node;
  68
  69         struct in6_addr                 rt6i_gateway;
  70
  71         u32                             rt6i_flags;
  72         u32                             rt6i_metric;
  73         atomic_t                        rt6i_ref;
  74
  75         struct rt6key                   rt6i_dst;
  76         struct rt6key                   rt6i_src;
  77
  78         u8                              rt6i_protocol;
  79 };
  80
  81 struct fib6_walker_t
  82 {
  83         struct fib6_walker_t *prev, *next;
  84         struct fib6_node *root, *node;
  85         struct rt6_info *leaf;
  86         unsigned char state;
  87         unsigned char prune;
  88         int (*func)(struct fib6_walker_t *);
  89         void *args;
  90 };
  91
  92 extern struct fib6_walker_t fib6_walker_list;
  93 extern rwlock_t fib6_walker_lock;
  94
  95 static inline void fib6_walker_link(struct fib6_walker_t *w)
  96 {
  97         write_lock_bh(&fib6_walker_lock);
  98         w->next = fib6_walker_list.next;
  99         w->prev = &fib6_walker_list;
 100         w->next->prev = w;
 101         w->prev->next = w;
 102         write_unlock_bh(&fib6_walker_lock);
 103 }
 104
 105 static inline void fib6_walker_unlink(struct fib6_walker_t *w)
 106 {
 107         write_lock_bh(&fib6_walker_lock);
 108         w->next->prev = w->prev;
 109         w->prev->next = w->next;
 110         w->prev = w->next = w;
 111         write_unlock_bh(&fib6_walker_lock);
 112 }
 113
 114 struct rt6_statistics {
 115         __u32           fib_nodes;
 116         __u32           fib_route_nodes;
 117         __u32           fib_rt_alloc;           /* permanent routes     */
 118         __u32           fib_rt_entries;         /* rt entries in table  */
 119         __u32           fib_rt_cache;           /* cache routes         */
 120         __u32           fib_discarded_routes;
 121 };
 122
 123 #define RTN_TL_ROOT     0x0001
 124 #define RTN_ROOT        0x0002          /* tree root node               */
 125 #define RTN_RTINFO      0x0004          /* node with valid routing info */
 126
 127 /*
 128  *      priority levels (or metrics)
 129  *
 130  */
 131
 132 #define RTPRI_FIREWALL  8               /* Firewall control information */
 133 #define RTPRI_FLOW      16              /* Flow based forwarding rules  */
 134 #define RTPRI_KERN_CTL  32              /* Kernel control routes        */
 135
 136 #define RTPRI_USER_MIN  256             /* Mimimum user priority        */
 137 #define RTPRI_USER_MAX  1024            /* Maximum user priority        */
 138
 139 #define RTPRI_KERN_DFLT 4096            /* Kernel default routes        */
 140
 141 #define MAX_FLOW_BACKTRACE      32
 142
 143
 144 typedef void                    (*f_pnode)(struct fib6_node *fn, void *);
 145
 146 extern struct fib6_node         ip6_routing_table;
 147
 148 /*
 149  *      exported functions
 150  */
 151
 152 extern struct fib6_node         *fib6_lookup(struct fib6_node *root,
 153                                              struct in6_addr *daddr,
 154                                              struct in6_addr *saddr);
 155
 156 struct fib6_node                *fib6_locate(struct fib6_node *root,
 157                                              struct in6_addr *daddr, int dst_len,
 158                                              struct in6_addr *saddr, int src_len);
 159
 160 extern void                     fib6_clean_tree(struct fib6_node *root,
 161                                                 int (*func)(struct rt6_info *, void *arg),
 162                                                 int prune, void *arg);
 163
 164 extern int                      fib6_walk(struct fib6_walker_t *w);
 165 extern int                      fib6_walk_continue(struct fib6_walker_t *w);
 166
 167 extern int                      fib6_add(struct fib6_node *root,
 168                                          struct rt6_info *rt,
 169                                          struct nlmsghdr *nlh,
 170                                          void *rtattr,
 171                                          struct netlink_skb_parms *req);
 172
 173 extern int                      fib6_del(struct rt6_info *rt,
 174                                          struct nlmsghdr *nlh,
 175                                          void *rtattr,
 176                                          struct netlink_skb_parms *req);
 177
 178 extern void                     inet6_rt_notify(int event, struct rt6_info *rt,
 179                                                 struct nlmsghdr *nlh,
 180                                                 struct netlink_skb_parms *req);
 181
 182 extern void                     fib6_run_gc(unsigned long dummy);
 183
 184 extern void                     fib6_gc_cleanup(void);
 185
 186 extern void                     fib6_init(void);
 187 #endif
 188 #endif