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