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 #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 struct rt6_info;
  26
  27 struct fib6_config
  28 {
  29         u32             fc_table;
  30         u32             fc_metric;
  31         int             fc_dst_len;
  32         int             fc_src_len;
  33         int             fc_ifindex;
  34         u32             fc_flags;
  35         u32             fc_protocol;
  36
  37         struct in6_addr fc_dst;
  38         struct in6_addr fc_src;
  39         struct in6_addr fc_gateway;
  40
  41         unsigned long   fc_expires;
  42         struct nlattr   *fc_mx;
  43         int             fc_mx_len;
  44
  45         struct nl_info  fc_nlinfo;
  46 };
  47
  48 struct fib6_node
  49 {
  50         struct fib6_node        *parent;
  51         struct fib6_node        *left;
  52         struct fib6_node        *right;
  53 #ifdef CONFIG_IPV6_SUBTREES
  54         struct fib6_node        *subtree;
  55 #endif
  56         struct rt6_info         *leaf;
  57
  58         __u16                   fn_bit;         /* bit key */
  59         __u16                   fn_flags;
  60         __u32                   fn_sernum;
  61 };
  62
  63 #ifndef CONFIG_IPV6_SUBTREES
  64 #define FIB6_SUBTREE(fn)        NULL
  65 #else
  66 #define FIB6_SUBTREE(fn)        ((fn)->subtree)
  67 #endif
  68
  69 /*
  70  *      routing information
  71  *
  72  */
  73
  74 struct rt6key
  75 {
  76         struct in6_addr addr;
  77         int             plen;
  78 };
  79
  80 struct fib6_table;
  81
  82 struct rt6_info
  83 {
  84         union {
  85                 struct dst_entry        dst;
  86         } u;
  87
  88         struct inet6_dev                *rt6i_idev;
  89
  90 #define rt6i_dev                        u.dst.dev
  91 #define rt6i_nexthop                    u.dst.neighbour
  92 #define rt6i_expires                    u.dst.expires
  93
  94         struct fib6_node                *rt6i_node;
  95
  96         struct in6_addr                 rt6i_gateway;
  97
  98         u32                             rt6i_flags;
  99         u32                             rt6i_metric;
 100         atomic_t                        rt6i_ref;
 101         struct fib6_table               *rt6i_table;
 102
 103         struct rt6key                   rt6i_dst;
 104         struct rt6key                   rt6i_src;
 105
 106         u8                              rt6i_protocol;
 107 };
 108
 109 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
 110 {
 111         return ((struct rt6_info *)dst)->rt6i_idev;
 112 }
 113
 114 struct fib6_walker_t
 115 {
 116         struct fib6_walker_t *prev, *next;
 117         struct fib6_node *root, *node;
 118         struct rt6_info *leaf;
 119         unsigned char state;
 120         unsigned char prune;
 121         int (*func)(struct fib6_walker_t *);
 122         void *args;
 123 };
 124
 125 struct rt6_statistics {
 126         __u32           fib_nodes;
 127         __u32           fib_route_nodes;
 128         __u32           fib_rt_alloc;           /* permanent routes     */
 129         __u32           fib_rt_entries;         /* rt entries in table  */
 130         __u32           fib_rt_cache;           /* cache routes         */
 131         __u32           fib_discarded_routes;
 132 };
 133
 134 #define RTN_TL_ROOT     0x0001
 135 #define RTN_ROOT        0x0002          /* tree root node               */
 136 #define RTN_RTINFO      0x0004          /* node with valid routing info */
 137
 138 /*
 139  *      priority levels (or metrics)
 140  *
 141  */
 142
 143 #define RTPRI_FIREWALL  8               /* Firewall control information */
 144 #define RTPRI_FLOW      16              /* Flow based forwarding rules  */
 145 #define RTPRI_KERN_CTL  32              /* Kernel control routes        */
 146
 147 #define RTPRI_USER_MIN  256             /* Mimimum user priority        */
 148 #define RTPRI_USER_MAX  1024            /* Maximum user priority        */
 149
 150 #define RTPRI_KERN_DFLT 4096            /* Kernel default routes        */
 151
 152 #define MAX_FLOW_BACKTRACE      32
 153
 154
 155 typedef void                    (*f_pnode)(struct fib6_node *fn, void *);
 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 fib6_table *,
 181                                          struct flowi *, int);
 182
 183 /*
 184  *      exported functions
 185  */
 186
 187 extern struct fib6_table *      fib6_get_table(u32 id);
 188 extern struct fib6_table *      fib6_new_table(u32 id);
 189 extern struct dst_entry *       fib6_rule_lookup(struct flowi *fl, int flags,
 190                                                  pol_lookup_t lookup);
 191
 192 extern struct fib6_node         *fib6_lookup(struct fib6_node *root,
 193                                              struct in6_addr *daddr,
 194                                              struct in6_addr *saddr);
 195
 196 struct fib6_node                *fib6_locate(struct fib6_node *root,
 197                                              struct in6_addr *daddr, int dst_len,
 198                                              struct in6_addr *saddr, int src_len);
 199
 200 extern void                     fib6_clean_all(int (*func)(struct rt6_info *, void *arg),
 201                                                int prune, void *arg);
 202
 203 extern int                      fib6_add(struct fib6_node *root,
 204                                          struct rt6_info *rt,
 205                                          struct nl_info *info);
 206
 207 extern int                      fib6_del(struct rt6_info *rt,
 208                                          struct nl_info *info);
 209
 210 extern void                     inet6_rt_notify(int event, struct rt6_info *rt,
 211                                                 struct nl_info *info);
 212
 213 extern void                     fib6_run_gc(unsigned long dummy);
 214
 215 extern void                     fib6_gc_cleanup(void);
 216
 217 extern void                     fib6_init(void);
 218
 219 extern void                     fib6_rules_init(void);
 220 extern void                     fib6_rules_cleanup(void);
 221 extern int                      fib6_rules_dump(struct sk_buff *,
 222                                                 struct netlink_callback *);
 223
 224 #endif
 225 #endif