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