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_prefsrc;
  46         struct in6_addr fc_gateway;
  47
  48         unsigned long   fc_expires;
  49         struct nlattr   *fc_mx;
  50         int             fc_mx_len;
  51
  52         struct nl_info  fc_nlinfo;
  53 };
  54
  55 struct fib6_node {
  56         struct fib6_node        *parent;
  57         struct fib6_node        *left;
  58         struct fib6_node        *right;
  59 #ifdef CONFIG_IPV6_SUBTREES
  60         struct fib6_node        *subtree;
  61 #endif
  62         struct rt6_info         *leaf;
  63
  64         __u16                   fn_bit;         /* bit key */
  65         __u16                   fn_flags;
  66         __u32                   fn_sernum;
  67         struct rt6_info         *rr_ptr;
  68 };
  69
  70 #ifndef CONFIG_IPV6_SUBTREES
  71 #define FIB6_SUBTREE(fn)        NULL
  72 #else
  73 #define FIB6_SUBTREE(fn)        ((fn)->subtree)
  74 #endif
  75
  76 /*
  77  *      routing information
  78  *
  79  */
  80
  81 struct rt6key {
  82         struct in6_addr addr;
  83         int             plen;
  84 };
  85
  86 struct fib6_table;
  87
  88 struct rt6_info {
  89         struct dst_entry                dst;
  90
  91 #define rt6i_dev                        dst.dev
  92 #define rt6i_nexthop                    dst.neighbour
  93 #define rt6i_expires                    dst.expires
  94
  95         /*
  96          * Tail elements of dst_entry (__refcnt etc.)
  97          * and these elements (rarely used in hot path) are in
  98          * the same cache line.
  99          */
 100         struct fib6_table               *rt6i_table;
 101         struct fib6_node                *rt6i_node;
 102
 103         struct in6_addr                 rt6i_gateway;
 104
 105         atomic_t                        rt6i_ref;
 106
 107         /* These are in a separate cache line. */
 108         struct rt6key                   rt6i_dst ____cacheline_aligned_in_smp;
 109         u32                             rt6i_flags;
 110         struct rt6key                   rt6i_src;
 111         struct rt6key                   rt6i_prefsrc;
 112         u32                             rt6i_metric;
 113         u32                             rt6i_peer_genid;
 114
 115         struct inet6_dev                *rt6i_idev;
 116         struct inet_peer                *rt6i_peer;
 117
 118 #ifdef CONFIG_XFRM
 119         u32                             rt6i_flow_cache_genid;
 120 #endif
 121         /* more non-fragment space at head required */
 122         unsigned short                  rt6i_nfheader_len;
 123
 124         u8                              rt6i_protocol;
 125 };
 126
 127 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
 128 {
 129         return ((struct rt6_info *)dst)->rt6i_idev;
 130 }
 131
 132 struct fib6_walker_t {
 133         struct list_head lh;
 134         struct fib6_node *root, *node;
 135         struct rt6_info *leaf;
 136         unsigned char state;
 137         unsigned char prune;
 138         unsigned int skip;
 139         unsigned int count;
 140         int (*func)(struct fib6_walker_t *);
 141         void *args;
 142 };
 143
 144 struct rt6_statistics {
 145         __u32           fib_nodes;
 146         __u32           fib_route_nodes;
 147         __u32           fib_rt_alloc;           /* permanent routes     */
 148         __u32           fib_rt_entries;         /* rt entries in table  */
 149         __u32           fib_rt_cache;           /* cache routes         */
 150         __u32           fib_discarded_routes;
 151 };
 152
 153 #define RTN_TL_ROOT     0x0001
 154 #define RTN_ROOT        0x0002          /* tree root node               */
 155 #define RTN_RTINFO      0x0004          /* node with valid routing info */
 156
 157 /*
 158  *      priority levels (or metrics)
 159  *
 160  */
 161
 162
 163 struct fib6_table {
 164         struct hlist_node       tb6_hlist;
 165         u32                     tb6_id;
 166         rwlock_t                tb6_lock;
 167         struct fib6_node        tb6_root;
 168 };
 169
 170 #define RT6_TABLE_UNSPEC        RT_TABLE_UNSPEC
 171 #define RT6_TABLE_MAIN          RT_TABLE_MAIN
 172 #define RT6_TABLE_DFLT          RT6_TABLE_MAIN
 173 #define RT6_TABLE_INFO          RT6_TABLE_MAIN
 174 #define RT6_TABLE_PREFIX        RT6_TABLE_MAIN
 175
 176 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 177 #define FIB6_TABLE_MIN          1
 178 #define FIB6_TABLE_MAX          RT_TABLE_MAX
 179 #define RT6_TABLE_LOCAL         RT_TABLE_LOCAL
 180 #else
 181 #define FIB6_TABLE_MIN          RT_TABLE_MAIN
 182 #define FIB6_TABLE_MAX          FIB6_TABLE_MIN
 183 #define RT6_TABLE_LOCAL         RT6_TABLE_MAIN
 184 #endif
 185
 186 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
 187                                          struct fib6_table *,
 188                                          struct flowi6 *, int);
 189
 190 /*
 191  *      exported functions
 192  */
 193
 194 extern struct fib6_table        *fib6_get_table(struct net *net, u32 id);
 195 extern struct fib6_table        *fib6_new_table(struct net *net, u32 id);
 196 extern struct dst_entry         *fib6_rule_lookup(struct net *net,
 197                                                   struct flowi6 *fl6, int flags,
 198                                                   pol_lookup_t lookup);
 199
 200 extern struct fib6_node         *fib6_lookup(struct fib6_node *root,
 201                                              const struct in6_addr *daddr,
 202                                              const struct in6_addr *saddr);
 203
 204 struct fib6_node                *fib6_locate(struct fib6_node *root,
 205                                              const struct in6_addr *daddr, int dst_len,
 206                                              const struct in6_addr *saddr, int src_len);
 207
 208 extern void                     fib6_clean_all(struct net *net,
 209                                                int (*func)(struct rt6_info *, void *arg),
 210                                                int prune, void *arg);
 211
 212 extern int                      fib6_add(struct fib6_node *root,
 213                                          struct rt6_info *rt,
 214                                          struct nl_info *info);
 215
 216 extern int                      fib6_del(struct rt6_info *rt,
 217                                          struct nl_info *info);
 218
 219 extern void                     inet6_rt_notify(int event, struct rt6_info *rt,
 220                                                 struct nl_info *info);
 221
 222 extern void                     fib6_run_gc(unsigned long expires,
 223                                             struct net *net);
 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