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         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
  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         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
 123 static inline struct inet_peer *rt6_peer_ptr(struct rt6_info *rt)
 124 {
 125         return inetpeer_ptr(rt->_rt6i_peer);
 126 }
 127
 128 static inline bool rt6_has_peer(struct rt6_info *rt)
 129 {
 130         return inetpeer_ptr_is_peer(rt->_rt6i_peer);
 131 }
 132
 133 static 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
 138 static 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
 143 static 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
 148 static 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
 153 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
 154 {
 155         return ((struct rt6_info *)dst)->rt6i_idev;
 156 }
 157
 158 static 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
 167 static 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
 176 static 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
 191 static 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
 206 struct 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
 218 struct 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
 237 struct 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
 261 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
 262                                          struct fib6_table *,
 263                                          struct flowi6 *, int);
 264
 265 /*
 266  *      exported functions
 267  */
 268
 269 extern struct fib6_table        *fib6_get_table(struct net *net, u32 id);
 270 extern struct fib6_table        *fib6_new_table(struct net *net, u32 id);
 271 extern struct dst_entry         *fib6_rule_lookup(struct net *net,
 272                                                   struct flowi6 *fl6, int flags,
 273                                                   pol_lookup_t lookup);
 274
 275 extern struct fib6_node         *fib6_lookup(struct fib6_node *root,
 276                                              const struct in6_addr *daddr,
 277                                              const struct in6_addr *saddr);
 278
 279 struct 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
 283 extern void                     fib6_clean_all_ro(struct net *net,
 284                                                int (*func)(struct rt6_info *, void *arg),
 285                                                int prune, void *arg);
 286
 287 extern void                     fib6_clean_all(struct net *net,
 288                                                int (*func)(struct rt6_info *, void *arg),
 289                                                int prune, void *arg);
 290
 291 extern int                      fib6_add(struct fib6_node *root,
 292                                          struct rt6_info *rt,
 293                                          struct nl_info *info);
 294
 295 extern int                      fib6_del(struct rt6_info *rt,
 296                                          struct nl_info *info);
 297
 298 extern void                     inet6_rt_notify(int event, struct rt6_info *rt,
 299                                                 struct nl_info *info);
 300
 301 extern void                     fib6_run_gc(unsigned long expires,
 302                                             struct net *net);
 303
 304 extern void                     fib6_gc_cleanup(void);
 305
 306 extern int                      fib6_init(void);
 307
 308 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 309 extern int                      fib6_rules_init(void);
 310 extern void                     fib6_rules_cleanup(void);
 311 #else
 312 static inline int               fib6_rules_init(void)
 313 {
 314         return 0;
 315 }
 316 static inline void              fib6_rules_cleanup(void)
 317 {
 318         return ;
 319 }
 320 #endif
 321 #endif