linux/include/net/ip6_fib.h
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   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#include <linux/ipv6_route.h>
  17#include <linux/rtnetlink.h>
  18#include <linux/spinlock.h>
  19#include <net/dst.h>
  20#include <net/flow.h>
  21#include <net/netlink.h>
  22#include <net/inetpeer.h>
  23
  24#ifdef CONFIG_IPV6_MULTIPLE_TABLES
  25#define FIB6_TABLE_HASHSZ 256
  26#else
  27#define FIB6_TABLE_HASHSZ 1
  28#endif
  29
  30struct rt6_info;
  31
  32struct fib6_config {
  33        u32             fc_table;
  34        u32             fc_metric;
  35        int             fc_dst_len;
  36        int             fc_src_len;
  37        int             fc_ifindex;
  38        u32             fc_flags;
  39        u32             fc_protocol;
  40        u32             fc_type;        /* only 8 bits are used */
  41
  42        struct in6_addr fc_dst;
  43        struct in6_addr fc_src;
  44        struct in6_addr fc_prefsrc;
  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
  54struct 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
  80struct rt6key {
  81        struct in6_addr addr;
  82        int             plen;
  83};
  84
  85struct fib6_table;
  86
  87struct rt6_info {
  88        struct dst_entry                dst;
  89
  90        struct neighbour                *n;
  91
  92        /*
  93         * Tail elements of dst_entry (__refcnt etc.)
  94         * and these elements (rarely used in hot path) are in
  95         * the same cache line.
  96         */
  97        struct fib6_table               *rt6i_table;
  98        struct fib6_node                *rt6i_node;
  99
 100        struct in6_addr                 rt6i_gateway;
 101
 102        atomic_t                        rt6i_ref;
 103
 104        /* These are in a separate cache line. */
 105        struct rt6key                   rt6i_dst ____cacheline_aligned_in_smp;
 106        u32                             rt6i_flags;
 107        struct rt6key                   rt6i_src;
 108        struct rt6key                   rt6i_prefsrc;
 109        u32                             rt6i_metric;
 110        u32                             rt6i_peer_genid;
 111
 112        struct inet6_dev                *rt6i_idev;
 113        unsigned long                   _rt6i_peer;
 114
 115        u32                             rt6i_genid;
 116
 117        /* more non-fragment space at head required */
 118        unsigned short                  rt6i_nfheader_len;
 119
 120        u8                              rt6i_protocol;
 121};
 122
 123static inline struct inet_peer *rt6_peer_ptr(struct rt6_info *rt)
 124{
 125        return inetpeer_ptr(rt->_rt6i_peer);
 126}
 127
 128static inline bool rt6_has_peer(struct rt6_info *rt)
 129{
 130        return inetpeer_ptr_is_peer(rt->_rt6i_peer);
 131}
 132
 133static inline void __rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
 134{
 135        __inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
 136}
 137
 138static inline bool rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
 139{
 140        return inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
 141}
 142
 143static inline void rt6_init_peer(struct rt6_info *rt, struct inet_peer_base *base)
 144{
 145        inetpeer_init_ptr(&rt->_rt6i_peer, base);
 146}
 147
 148static inline void rt6_transfer_peer(struct rt6_info *rt, struct rt6_info *ort)
 149{
 150        inetpeer_transfer_peer(&rt->_rt6i_peer, &ort->_rt6i_peer);
 151}
 152
 153static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
 154{
 155        return ((struct rt6_info *)dst)->rt6i_idev;
 156}
 157
 158static inline void rt6_clean_expires(struct rt6_info *rt)
 159{
 160        if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
 161                dst_release(rt->dst.from);
 162
 163        rt->rt6i_flags &= ~RTF_EXPIRES;
 164        rt->dst.from = NULL;
 165}
 166
 167static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
 168{
 169        if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
 170                dst_release(rt->dst.from);
 171
 172        rt->rt6i_flags |= RTF_EXPIRES;
 173        rt->dst.expires = expires;
 174}
 175
 176static inline void rt6_update_expires(struct rt6_info *rt, int timeout)
 177{
 178        if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 179                if (rt->dst.from)
 180                        dst_release(rt->dst.from);
 181                /* dst_set_expires relies on expires == 0 
 182                 * if it has not been set previously.
 183                 */
 184                rt->dst.expires = 0;
 185        }
 186
 187        dst_set_expires(&rt->dst, timeout);
 188        rt->rt6i_flags |= RTF_EXPIRES;
 189}
 190
 191static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
 192{
 193        struct dst_entry *new = (struct dst_entry *) from;
 194
 195        if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) {
 196                if (new == rt->dst.from)
 197                        return;
 198                dst_release(rt->dst.from);
 199        }
 200
 201        rt->rt6i_flags &= ~RTF_EXPIRES;
 202        rt->dst.from = new;
 203        dst_hold(new);
 204}
 205
 206struct fib6_walker_t {
 207        struct list_head lh;
 208        struct fib6_node *root, *node;
 209        struct rt6_info *leaf;
 210        unsigned char state;
 211        unsigned char prune;
 212        unsigned int skip;
 213        unsigned int count;
 214        int (*func)(struct fib6_walker_t *);
 215        void *args;
 216};
 217
 218struct rt6_statistics {
 219        __u32           fib_nodes;
 220        __u32           fib_route_nodes;
 221        __u32           fib_rt_alloc;           /* permanent routes     */
 222        __u32           fib_rt_entries;         /* rt entries in table  */
 223        __u32           fib_rt_cache;           /* cache routes         */
 224        __u32           fib_discarded_routes;
 225};
 226
 227#define RTN_TL_ROOT     0x0001
 228#define RTN_ROOT        0x0002          /* tree root node               */
 229#define RTN_RTINFO      0x0004          /* node with valid routing info */
 230
 231/*
 232 *      priority levels (or metrics)
 233 *
 234 */
 235
 236
 237struct fib6_table {
 238        struct hlist_node       tb6_hlist;
 239        u32                     tb6_id;
 240        rwlock_t                tb6_lock;
 241        struct fib6_node        tb6_root;
 242        struct inet_peer_base   tb6_peers;
 243};
 244
 245#define RT6_TABLE_UNSPEC        RT_TABLE_UNSPEC
 246#define RT6_TABLE_MAIN          RT_TABLE_MAIN
 247#define RT6_TABLE_DFLT          RT6_TABLE_MAIN
 248#define RT6_TABLE_INFO          RT6_TABLE_MAIN
 249#define RT6_TABLE_PREFIX        RT6_TABLE_MAIN
 250
 251#ifdef CONFIG_IPV6_MULTIPLE_TABLES
 252#define FIB6_TABLE_MIN          1
 253#define FIB6_TABLE_MAX          RT_TABLE_MAX
 254#define RT6_TABLE_LOCAL         RT_TABLE_LOCAL
 255#else
 256#define FIB6_TABLE_MIN          RT_TABLE_MAIN
 257#define FIB6_TABLE_MAX          FIB6_TABLE_MIN
 258#define RT6_TABLE_LOCAL         RT6_TABLE_MAIN
 259#endif
 260
 261typedef struct rt6_info *(*pol_lookup_t)(struct net *,
 262                                         struct fib6_table *,
 263                                         struct flowi6 *, int);
 264
 265/*
 266 *      exported functions
 267 */
 268
 269extern struct fib6_table        *fib6_get_table(struct net *net, u32 id);
 270extern struct fib6_table        *fib6_new_table(struct net *net, u32 id);
 271extern struct dst_entry         *fib6_rule_lookup(struct net *net,
 272                                                  struct flowi6 *fl6, int flags,
 273                                                  pol_lookup_t lookup);
 274
 275extern struct fib6_node         *fib6_lookup(struct fib6_node *root,
 276                                             const struct in6_addr *daddr,
 277                                             const struct in6_addr *saddr);
 278
 279struct fib6_node                *fib6_locate(struct fib6_node *root,
 280                                             const struct in6_addr *daddr, int dst_len,
 281                                             const struct in6_addr *saddr, int src_len);
 282
 283extern void                     fib6_clean_all_ro(struct net *net,
 284                                               int (*func)(struct rt6_info *, void *arg),
 285                                               int prune, void *arg);
 286
 287extern void                     fib6_clean_all(struct net *net,
 288                                               int (*func)(struct rt6_info *, void *arg),
 289                                               int prune, void *arg);
 290
 291extern int                      fib6_add(struct fib6_node *root,
 292                                         struct rt6_info *rt,
 293                                         struct nl_info *info);
 294
 295extern int                      fib6_del(struct rt6_info *rt,
 296                                         struct nl_info *info);
 297
 298extern void                     inet6_rt_notify(int event, struct rt6_info *rt,
 299                                                struct nl_info *info);
 300
 301extern void                     fib6_run_gc(unsigned long expires,
 302                                            struct net *net);
 303
 304extern void                     fib6_gc_cleanup(void);
 305
 306extern int                      fib6_init(void);
 307
 308#ifdef CONFIG_IPV6_MULTIPLE_TABLES
 309extern int                      fib6_rules_init(void);
 310extern void                     fib6_rules_cleanup(void);
 311#else
 312static inline int               fib6_rules_init(void)
 313{
 314        return 0;
 315}
 316static inline void              fib6_rules_cleanup(void)
 317{
 318        return ;
 319}
 320#endif
 321#endif
 322
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