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