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 fib6_table;
  55
  56 struct rt6_info
  57 {
  58         union {
  59                 struct dst_entry        dst;
  60                 struct rt6_info         *next;
  61         } u;
  62
  63         struct inet6_dev                *rt6i_idev;
  64
  65 #define rt6i_dev                        u.dst.dev
  66 #define rt6i_nexthop                    u.dst.neighbour
  67 #define rt6i_expires                    u.dst.expires
  68
  69         struct fib6_node                *rt6i_node;
  70
  71         struct in6_addr                 rt6i_gateway;
  72
  73         u32                             rt6i_flags;
  74         u32                             rt6i_metric;
  75         atomic_t                        rt6i_ref;
  76         struct fib6_table               *rt6i_table;
  77
  78         struct rt6key                   rt6i_dst;
  79         struct rt6key                   rt6i_src;
  80
  81         u8                              rt6i_protocol;
  82 };
  83
  84 struct fib6_walker_t
  85 {
  86         struct fib6_walker_t *prev, *next;
  87         struct fib6_node *root, *node;
  88         struct rt6_info *leaf;
  89         unsigned char state;
  90         unsigned char prune;
  91         int (*func)(struct fib6_walker_t *);
  92         void *args;
  93 };
  94
  95 extern struct fib6_walker_t fib6_walker_list;
  96 extern rwlock_t fib6_walker_lock;
  97
  98 static inline void fib6_walker_link(struct fib6_walker_t *w)
  99 {
 100         write_lock_bh(&fib6_walker_lock);
 101         w->next = fib6_walker_list.next;
 102         w->prev = &fib6_walker_list;
 103         w->next->prev = w;
 104         w->prev->next = w;
 105         write_unlock_bh(&fib6_walker_lock);
 106 }
 107
 108 static inline void fib6_walker_unlink(struct fib6_walker_t *w)
 109 {
 110         write_lock_bh(&fib6_walker_lock);
 111         w->next->prev = w->prev;
 112         w->prev->next = w->next;
 113         w->prev = w->next = w;
 114         write_unlock_bh(&fib6_walker_lock);
 115 }
 116
 117 struct rt6_statistics {
 118         __u32           fib_nodes;
 119         __u32           fib_route_nodes;
 120         __u32           fib_rt_alloc;           /* permanent routes     */
 121         __u32           fib_rt_entries;         /* rt entries in table  */
 122         __u32           fib_rt_cache;           /* cache routes         */
 123         __u32           fib_discarded_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 struct fib6_table {
 150         struct hlist_node       tb6_hlist;
 151         u32                     tb6_id;
 152         rwlock_t                tb6_lock;
 153         struct fib6_node        tb6_root;
 154 };
 155
 156 #define RT6_TABLE_UNSPEC        RT_TABLE_UNSPEC
 157 #define RT6_TABLE_MAIN          RT_TABLE_MAIN
 158 #define RT6_TABLE_DFLT          RT6_TABLE_MAIN
 159 #define RT6_TABLE_INFO          RT6_TABLE_MAIN
 160 #define RT6_TABLE_PREFIX        RT6_TABLE_MAIN
 161
 162 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 163 #define FIB6_TABLE_MIN          1
 164 #define FIB6_TABLE_MAX          RT_TABLE_MAX
 165 #define RT6_TABLE_LOCAL         RT_TABLE_LOCAL
 166 #else
 167 #define FIB6_TABLE_MIN          RT_TABLE_MAIN
 168 #define FIB6_TABLE_MAX          FIB6_TABLE_MIN
 169 #define RT6_TABLE_LOCAL         RT6_TABLE_MAIN
 170 #endif
 171
 172 #define RT6_F_STRICT            1
 173 #define RT6_F_HAS_SADDR         2
 174
 175 typedef struct rt6_info *(*pol_lookup_t)(struct fib6_table *,
 176                                          struct flowi *, int);
 177
 178 /*
 179  *      exported functions
 180  */
 181
 182 extern struct fib6_table *      fib6_get_table(u32 id);
 183 extern struct fib6_table *      fib6_new_table(u32 id);
 184 extern struct dst_entry *       fib6_rule_lookup(struct flowi *fl, int flags,
 185                                                  pol_lookup_t lookup);
 186
 187 extern struct fib6_node         *fib6_lookup(struct fib6_node *root,
 188                                              struct in6_addr *daddr,
 189                                              struct in6_addr *saddr);
 190
 191 struct fib6_node                *fib6_locate(struct fib6_node *root,
 192                                              struct in6_addr *daddr, int dst_len,
 193                                              struct in6_addr *saddr, int src_len);
 194
 195 extern void                     fib6_clean_all(int (*func)(struct rt6_info *, void *arg),
 196                                                int prune, void *arg);
 197
 198 extern int                      fib6_walk(struct fib6_walker_t *w);
 199 extern int                      fib6_walk_continue(struct fib6_walker_t *w);
 200
 201 extern int                      fib6_add(struct fib6_node *root,
 202                                          struct rt6_info *rt,
 203                                          struct nlmsghdr *nlh,
 204                                          void *rtattr,
 205                                          struct netlink_skb_parms *req);
 206
 207 extern int                      fib6_del(struct rt6_info *rt,
 208                                          struct nlmsghdr *nlh,
 209                                          void *rtattr,
 210                                          struct netlink_skb_parms *req);
 211
 212 extern void                     inet6_rt_notify(int event, struct rt6_info *rt,
 213                                                 struct nlmsghdr *nlh,
 214                                                 struct netlink_skb_parms *req);
 215
 216 extern void                     fib6_run_gc(unsigned long dummy);
 217
 218 extern void                     fib6_gc_cleanup(void);
 219
 220 extern void                     fib6_init(void);
 221
 222 extern void                     fib6_rules_init(void);
 223 extern void                     fib6_rules_cleanup(void);
 224 extern int                      fib6_rules_dump(struct sk_buff *,
 225                                                 struct netlink_callback *);
 226
 227 #endif
 228 #endif