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 #include <net/inetpeer.h>
  25
  26 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
  27 #define FIB6_TABLE_HASHSZ 256
  28 #else
  29 #define FIB6_TABLE_HASHSZ 1
  30 #endif
  31
  32 struct rt6_info;
  33
  34 struct fib6_config {
  35         u32             fc_table;
  36         u32             fc_metric;
  37         int             fc_dst_len;
  38         int             fc_src_len;
  39         int             fc_ifindex;
  40         u32             fc_flags;
  41         u32             fc_protocol;
  42
  43         struct in6_addr fc_dst;
  44         struct in6_addr fc_src;
  45         struct in6_addr fc_gateway;
  46
  47         unsigned long   fc_expires;
  48         struct nlattr   *fc_mx;
  49         int             fc_mx_len;
  50
  51         struct nl_info  fc_nlinfo;
  52 };
  53
  54 struct fib6_node {
  55         struct fib6_node        *parent;
  56         struct fib6_node        *left;
  57         struct fib6_node        *right;
  58 #ifdef CONFIG_IPV6_SUBTREES
  59         struct fib6_node        *subtree;
  60 #endif
  61         struct rt6_info         *leaf;
  62
  63         __u16                   fn_bit;         /* bit key */
  64         __u16                   fn_flags;
  65         __u32                   fn_sernum;
  66         struct rt6_info         *rr_ptr;
  67 };
  68
  69 #ifndef CONFIG_IPV6_SUBTREES
  70 #define FIB6_SUBTREE(fn)        NULL
  71 #else
  72 #define FIB6_SUBTREE(fn)        ((fn)->subtree)
  73 #endif
  74
  75 /*
  76  *      routing information
  77  *
  78  */
  79
  80 struct rt6key {
  81         struct in6_addr addr;
  82         int             plen;
  83 };
  84
  85 struct fib6_table;
  86
  87 struct rt6_info {
  88         struct dst_entry                dst;
  89
  90 #define rt6i_dev                        dst.dev
  91 #define rt6i_nexthop                    dst.neighbour
  92 #define rt6i_expires                    dst.expires
  93
  94         /*
  95          * Tail elements of dst_entry (__refcnt etc.)
  96          * and these elements (rarely used in hot path) are in
  97          * the same cache line.
  98          */
  99         struct fib6_table               *rt6i_table;
 100         struct fib6_node                *rt6i_node;
 101
 102         struct in6_addr                 rt6i_gateway;
 103
 104         atomic_t                        rt6i_ref;
 105
 106         /* These are in a separate cache line. */
 107         struct rt6key                   rt6i_dst ____cacheline_aligned_in_smp;
 108         u32                             rt6i_flags;
 109         struct rt6key                   rt6i_src;
 110         u32                             rt6i_metric;
 111
 112         struct inet6_dev                *rt6i_idev;
 113         struct inet_peer                *rt6i_peer;
 114
 115 #ifdef CONFIG_XFRM
 116         u32                             rt6i_flow_cache_genid;
 117 #endif
 118         /* more non-fragment space at head required */
 119         unsigned short                  rt6i_nfheader_len;
 120
 121         u8                              rt6i_protocol;
 122 };
 123
 124 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
 125 {
 126         return ((struct rt6_info *)dst)->rt6i_idev;
 127 }
 128
 129 struct fib6_walker_t {
 130         struct list_head lh;
 131         struct fib6_node *root, *node;
 132         struct rt6_info *leaf;
 133         unsigned char state;
 134         unsigned char prune;
 135         unsigned int skip;
 136         unsigned int count;
 137         int (*func)(struct fib6_walker_t *);
 138         void *args;
 139 };
 140
 141 struct rt6_statistics {
 142         __u32           fib_nodes;
 143         __u32           fib_route_nodes;
 144         __u32           fib_rt_alloc;           /* permanent routes     */
 145         __u32           fib_rt_entries;         /* rt entries in table  */
 146         __u32           fib_rt_cache;           /* cache routes         */
 147         __u32           fib_discarded_routes;
 148 };
 149
 150 #define RTN_TL_ROOT     0x0001
 151 #define RTN_ROOT        0x0002          /* tree root node               */
 152 #define RTN_RTINFO      0x0004          /* node with valid routing info */
 153
 154 /*
 155  *      priority levels (or metrics)
 156  *
 157  */
 158
 159
 160 struct fib6_table {
 161         struct hlist_node       tb6_hlist;
 162         u32                     tb6_id;
 163         rwlock_t                tb6_lock;
 164         struct fib6_node        tb6_root;
 165 };
 166
 167 #define RT6_TABLE_UNSPEC        RT_TABLE_UNSPEC
 168 #define RT6_TABLE_MAIN          RT_TABLE_MAIN
 169 #define RT6_TABLE_DFLT          RT6_TABLE_MAIN
 170 #define RT6_TABLE_INFO          RT6_TABLE_MAIN
 171 #define RT6_TABLE_PREFIX        RT6_TABLE_MAIN
 172
 173 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 174 #define FIB6_TABLE_MIN          1
 175 #define FIB6_TABLE_MAX          RT_TABLE_MAX
 176 #define RT6_TABLE_LOCAL         RT_TABLE_LOCAL
 177 #else
 178 #define FIB6_TABLE_MIN          RT_TABLE_MAIN
 179 #define FIB6_TABLE_MAX          FIB6_TABLE_MIN
 180 #define RT6_TABLE_LOCAL         RT6_TABLE_MAIN
 181 #endif
 182
 183 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
 184                                          struct fib6_table *,
 185                                          struct flowi *, int);
 186
 187 /*
 188  *      exported functions
 189  */
 190
 191 extern struct fib6_table        *fib6_get_table(struct net *net, u32 id);
 192 extern struct fib6_table        *fib6_new_table(struct net *net, u32 id);
 193 extern struct dst_entry         *fib6_rule_lookup(struct net *net,
 194                                                   struct flowi *fl, int flags,
 195                                                   pol_lookup_t lookup);
 196
 197 extern struct fib6_node         *fib6_lookup(struct fib6_node *root,
 198                                              struct in6_addr *daddr,
 199                                              struct in6_addr *saddr);
 200
 201 struct fib6_node                *fib6_locate(struct fib6_node *root,
 202                                              struct in6_addr *daddr, int dst_len,
 203                                              struct in6_addr *saddr, int src_len);
 204
 205 extern void                     fib6_clean_all(struct net *net,
 206                                                int (*func)(struct rt6_info *, void *arg),
 207                                                int prune, void *arg);
 208
 209 extern int                      fib6_add(struct fib6_node *root,
 210                                          struct rt6_info *rt,
 211                                          struct nl_info *info);
 212
 213 extern int                      fib6_del(struct rt6_info *rt,
 214                                          struct nl_info *info);
 215
 216 extern void                     inet6_rt_notify(int event, struct rt6_info *rt,
 217                                                 struct nl_info *info);
 218
 219 extern void                     fib6_run_gc(unsigned long expires,
 220                                             struct net *net);
 221
 222 extern void                     fib6_gc_cleanup(void);
 223
 224 extern int                      fib6_init(void);
 225
 226 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 227 extern int                      fib6_rules_init(void);
 228 extern void                     fib6_rules_cleanup(void);
 229 #else
 230 static inline int               fib6_rules_init(void)
 231 {
 232         return 0;
 233 }
 234 static inline void              fib6_rules_cleanup(void)
 235 {
 236         return ;
 237 }
 238 #endif
 239 #endif
 240 #endif