LXR linux/include/net/fib

   1#ifndef __NET_FIB_RULES_H
   2#define __NET_FIB_RULES_H
   3
   4#include <linux/types.h>
   5#include <linux/slab.h>
   6#include <linux/netdevice.h>
   7#include <linux/fib_rules.h>
   8#include <net/flow.h>
   9#include <net/rtnetlink.h>
  10
  11struct fib_rule {
  12        struct list_head        list;
  13        int                     iifindex;
  14        int                     oifindex;
  15        u32                     mark;
  16        u32                     mark_mask;
  17        u32                     flags;
  18        u32                     table;
  19        u8                      action;
  20        /* 3 bytes hole, try to use */
  21        u32                     target;
  22        __be64                  tun_id;
  23        struct fib_rule __rcu   *ctarget;
  24        struct net              *fr_net;
  25
  26        atomic_t                refcnt;
  27        u32                     pref;
  28        int                     suppress_ifgroup;
  29        int                     suppress_prefixlen;
  30        char                    iifname[IFNAMSIZ];
  31        char                    oifname[IFNAMSIZ];
  32        struct rcu_head         rcu;
  33};
  34
  35struct fib_lookup_arg {
  36        void                    *lookup_ptr;
  37        void                    *result;
  38        struct fib_rule         *rule;
  39        int                     flags;
  40#define FIB_LOOKUP_NOREF                1
  41#define FIB_LOOKUP_IGNORE_LINKSTATE     2
  42};
  43
  44struct fib_rules_ops {
  45        int                     family;
  46        struct list_head        list;
  47        int                     rule_size;
  48        int                     addr_size;
  49        int                     unresolved_rules;
  50        int                     nr_goto_rules;
  51
  52        int                     (*action)(struct fib_rule *,
  53                                          struct flowi *, int,
  54                                          struct fib_lookup_arg *);
  55        bool                    (*suppress)(struct fib_rule *,
  56                                            struct fib_lookup_arg *);
  57        int                     (*match)(struct fib_rule *,
  58                                         struct flowi *, int);
  59        int                     (*configure)(struct fib_rule *,
  60                                             struct sk_buff *,
  61                                             struct fib_rule_hdr *,
  62                                             struct nlattr **);
  63        int                     (*delete)(struct fib_rule *);
  64        int                     (*compare)(struct fib_rule *,
  65                                           struct fib_rule_hdr *,
  66                                           struct nlattr **);
  67        int                     (*fill)(struct fib_rule *, struct sk_buff *,
  68                                        struct fib_rule_hdr *);
  69        size_t                  (*nlmsg_payload)(struct fib_rule *);
  70
  71        /* Called after modifications to the rules set, must flush
  72         * the route cache if one exists. */
  73        void                    (*flush_cache)(struct fib_rules_ops *ops);
  74
  75        int                     nlgroup;
  76        const struct nla_policy *policy;
  77        struct list_head        rules_list;
  78        struct module           *owner;
  79        struct net              *fro_net;
  80        struct rcu_head         rcu;
  81};
  82
  83#define FRA_GENERIC_POLICY \
  84        [FRA_IIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
  85        [FRA_OIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
  86        [FRA_PRIORITY]  = { .type = NLA_U32 }, \
  87        [FRA_FWMARK]    = { .type = NLA_U32 }, \
  88        [FRA_FWMASK]    = { .type = NLA_U32 }, \
  89        [FRA_TABLE]     = { .type = NLA_U32 }, \
  90        [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \
  91        [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
  92        [FRA_GOTO]      = { .type = NLA_U32 }
  93
  94static inline void fib_rule_get(struct fib_rule *rule)
  95{
  96        atomic_inc(&rule->refcnt);
  97}
  98
  99static inline void fib_rule_put(struct fib_rule *rule)
 100{
 101        if (atomic_dec_and_test(&rule->refcnt))
 102                kfree_rcu(rule, rcu);
 103}
 104
 105static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
 106{
 107        if (nla[FRA_TABLE])
 108                return nla_get_u32(nla[FRA_TABLE]);
 109        return frh->table;
 110}
 111
 112struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
 113                                         struct net *);
 114void fib_rules_unregister(struct fib_rules_ops *);
 115
 116int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
 117                     struct fib_lookup_arg *);
 118int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
 119                         u32 flags);
 120#endif
 121