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         struct rt6_info         *rr_ptr;
  62 };
  63
  64 #ifndef CONFIG_IPV6_SUBTREES
  65 #define FIB6_SUBTREE(fn)        NULL
  66 #else
  67 #define FIB6_SUBTREE(fn)        ((fn)->subtree)
  68 #endif
  69
  70 /*
  71  *      routing information
  72  *
  73  */
  74
  75 struct rt6key
  76 {
  77         struct in6_addr addr;
  78         int             plen;
  79 };
  80
  81 struct fib6_table;
  82
  83 struct rt6_info
  84 {
  85         union {
  86                 struct dst_entry        dst;
  87         } u;
  88
  89         struct inet6_dev                *rt6i_idev;
  90
  91 #define rt6i_dev                        u.dst.dev
  92 #define rt6i_nexthop                    u.dst.neighbour
  93 #define rt6i_expires                    u.dst.expires
  94
  95         struct fib6_node                *rt6i_node;
  96
  97         struct in6_addr                 rt6i_gateway;
  98
  99         u32                             rt6i_flags;
 100         u32                             rt6i_metric;
 101         atomic_t                        rt6i_ref;
 102
 103         /* more non-fragment space at head required */
 104         unsigned short                  rt6i_nfheader_len;
 105
 106         u8                              rt6i_protocol;
 107
 108         struct fib6_table               *rt6i_table;
 109
 110         struct rt6key                   rt6i_dst;
 111
 112 #ifdef CONFIG_XFRM
 113         u32                             rt6i_flow_cache_genid;
 114 #endif
 115
 116         struct rt6key                   rt6i_src;
 117 };
 118
 119 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
 120 {
 121         return ((struct rt6_info *)dst)->rt6i_idev;
 122 }
 123
 124 struct fib6_walker_t
 125 {
 126         struct fib6_walker_t *prev, *next;
 127         struct fib6_node *root, *node;
 128         struct rt6_info *leaf;
 129         unsigned char state;
 130         unsigned char prune;
 131         int (*func)(struct fib6_walker_t *);
 132         void *args;
 133 };
 134
 135 struct rt6_statistics {
 136         __u32           fib_nodes;
 137         __u32           fib_route_nodes;
 138         __u32           fib_rt_alloc;           /* permanent routes     */
 139         __u32           fib_rt_entries;         /* rt entries in table  */
 140         __u32           fib_rt_cache;           /* cache routes         */
 141         __u32           fib_discarded_routes;
 142 };
 143
 144 #define RTN_TL_ROOT     0x0001
 145 #define RTN_ROOT        0x0002          /* tree root node               */
 146 #define RTN_RTINFO      0x0004          /* node with valid routing info */
 147
 148 /*
 149  *      priority levels (or metrics)
 150  *
 151  */
 152
 153 #define RTPRI_FIREWALL  8               /* Firewall control information */
 154 #define RTPRI_FLOW      16              /* Flow based forwarding rules  */
 155 #define RTPRI_KERN_CTL  32              /* Kernel control routes        */
 156
 157 #define RTPRI_USER_MIN  256             /* Mimimum user priority        */
 158 #define RTPRI_USER_MAX  1024            /* Maximum user priority        */
 159
 160 #define RTPRI_KERN_DFLT 4096            /* Kernel default routes        */
 161
 162 #define MAX_FLOW_BACKTRACE      32
 163
 164
 165 typedef void                    (*f_pnode)(struct fib6_node *fn, void *);
 166
 167 struct fib6_table {
 168         struct hlist_node       tb6_hlist;
 169         u32                     tb6_id;
 170         rwlock_t                tb6_lock;
 171         struct fib6_node        tb6_root;
 172 };
 173
 174 #define RT6_TABLE_UNSPEC        RT_TABLE_UNSPEC
 175 #define RT6_TABLE_MAIN          RT_TABLE_MAIN
 176 #define RT6_TABLE_DFLT          RT6_TABLE_MAIN
 177 #define RT6_TABLE_INFO          RT6_TABLE_MAIN
 178 #define RT6_TABLE_PREFIX        RT6_TABLE_MAIN
 179
 180 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 181 #define FIB6_TABLE_MIN          1
 182 #define FIB6_TABLE_MAX          RT_TABLE_MAX
 183 #define RT6_TABLE_LOCAL         RT_TABLE_LOCAL
 184 #else
 185 #define FIB6_TABLE_MIN          RT_TABLE_MAIN
 186 #define FIB6_TABLE_MAX          FIB6_TABLE_MIN
 187 #define RT6_TABLE_LOCAL         RT6_TABLE_MAIN
 188 #endif
 189
 190 typedef struct rt6_info *(*pol_lookup_t)(struct fib6_table *,
 191                                          struct flowi *, int);
 192
 193 /*
 194  *      exported functions
 195  */
 196
 197 extern struct fib6_table *      fib6_get_table(u32 id);
 198 extern struct fib6_table *      fib6_new_table(u32 id);
 199 extern struct dst_entry *       fib6_rule_lookup(struct flowi *fl, int flags,
 200                                                  pol_lookup_t lookup);
 201
 202 extern struct fib6_node         *fib6_lookup(struct fib6_node *root,
 203                                              struct in6_addr *daddr,
 204                                              struct in6_addr *saddr);
 205
 206 struct fib6_node                *fib6_locate(struct fib6_node *root,
 207                                              struct in6_addr *daddr, int dst_len,
 208                                              struct in6_addr *saddr, int src_len);
 209
 210 extern void                     fib6_clean_all(int (*func)(struct rt6_info *, void *arg),
 211                                                int prune, void *arg);
 212
 213 extern int                      fib6_add(struct fib6_node *root,
 214                                          struct rt6_info *rt,
 215                                          struct nl_info *info);
 216
 217 extern int                      fib6_del(struct rt6_info *rt,
 218                                          struct nl_info *info);
 219
 220 extern void                     inet6_rt_notify(int event, struct rt6_info *rt,
 221                                                 struct nl_info *info);
 222
 223 extern void                     fib6_run_gc(unsigned long dummy);
 224
 225 extern void                     fib6_gc_cleanup(void);
 226
 227 extern int                      fib6_init(void);
 228
 229 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 230 extern int                      fib6_rules_init(void);
 231 extern void                     fib6_rules_cleanup(void);
 232 #else
 233 static inline int               fib6_rules_init(void)
 234 {
 235         return 0;
 236 }
 237 static inline void              fib6_rules_cleanup(void)
 238 {
 239         return ;
 240 }
 241 #endif
 242 #endif
 243 #endif