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        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        int                     (*compare)(struct fib_rule *,
  56                                           struct fib_rule_hdr *,
  57                                           struct nlattr **);
  58        int                     (*fill)(struct fib_rule *, struct sk_buff *,
  59                                        struct fib_rule_hdr *);
  60        u32                     (*default_pref)(struct fib_rules_ops *ops);
  61        size_t                  (*nlmsg_payload)(struct fib_rule *);
  62
  63        /* Called after modifications to the rules set, must flush
  64         * the route cache if one exists. */
  65        void                    (*flush_cache)(struct fib_rules_ops *ops);
  66
  67        int                     nlgroup;
  68        const struct nla_policy *policy;
  69        struct list_head        rules_list;
  70        struct module           *owner;
  71        struct net              *fro_net;
  72        struct rcu_head         rcu;
  73};
  74
  75#define FRA_GENERIC_POLICY \
  76        [FRA_IIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
  77        [FRA_OIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
  78        [FRA_PRIORITY]  = { .type = NLA_U32 }, \
  79        [FRA_FWMARK]    = { .type = NLA_U32 }, \
  80        [FRA_FWMASK]    = { .type = NLA_U32 }, \
  81        [FRA_TABLE]     = { .type = NLA_U32 }, \
  82        [FRA_GOTO]      = { .type = NLA_U32 }
  83
  84static inline void fib_rule_get(struct fib_rule *rule)
  85{
  86        atomic_inc(&rule->refcnt);
  87}
  88
  89static inline void fib_rule_put_rcu(struct rcu_head *head)
  90{
  91        struct fib_rule *rule = container_of(head, struct fib_rule, rcu);
  92        release_net(rule->fr_net);
  93        kfree(rule);
  94}
  95
  96static inline void fib_rule_put(struct fib_rule *rule)
  97{
  98        if (atomic_dec_and_test(&rule->refcnt))
  99                call_rcu(&rule->rcu, fib_rule_put_rcu);
 100}
 101
 102static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
 103{
 104        if (nla[FRA_TABLE])
 105                return nla_get_u32(nla[FRA_TABLE]);
 106        return frh->table;
 107}
 108
 109extern struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, struct net *);
 110extern void fib_rules_unregister(struct fib_rules_ops *);
 111
 112extern int                      fib_rules_lookup(struct fib_rules_ops *,
 113                                                 struct flowi *, int flags,
 114                                                 struct fib_lookup_arg *);
 115extern int                      fib_default_rule_add(struct fib_rules_ops *,
 116                                                     u32 pref, u32 table,
 117                                                     u32 flags);
 118extern u32                      fib_default_rule_pref(struct fib_rules_ops *ops);
 119#endif
 120