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/netdevice.h>
   6#include <linux/fib_rules.h>
   7#include <net/flow.h>
   8#include <net/rtnetlink.h>
   9
  10struct fib_rule
  11{
  12        struct list_head        list;
  13        atomic_t                refcnt;
  14        int                     ifindex;
  15        char                    ifname[IFNAMSIZ];
  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 *       ctarget;
  24        struct rcu_head         rcu;
  25        struct net *            fr_net;
  26};
  27
  28struct fib_lookup_arg
  29{
  30        void                    *lookup_ptr;
  31        void                    *result;
  32        struct fib_rule         *rule;
  33};
  34
  35struct fib_rules_ops
  36{
  37        int                     family;
  38        struct list_head        list;
  39        int                     rule_size;
  40        int                     addr_size;
  41        int                     unresolved_rules;
  42        int                     nr_goto_rules;
  43
  44        int                     (*action)(struct fib_rule *,
  45                                          struct flowi *, int,
  46                                          struct fib_lookup_arg *);
  47        int                     (*match)(struct fib_rule *,
  48                                         struct flowi *, int);
  49        int                     (*configure)(struct fib_rule *,
  50                                             struct sk_buff *,
  51                                             struct nlmsghdr *,
  52                                             struct fib_rule_hdr *,
  53                                             struct nlattr **);
  54        int                     (*compare)(struct fib_rule *,
  55                                           struct fib_rule_hdr *,
  56                                           struct nlattr **);
  57        int                     (*fill)(struct fib_rule *, struct sk_buff *,
  58                                        struct nlmsghdr *,
  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};
  73
  74#define FRA_GENERIC_POLICY \
  75        [FRA_IFNAME]    = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
  76        [FRA_PRIORITY]  = { .type = NLA_U32 }, \
  77        [FRA_FWMARK]    = { .type = NLA_U32 }, \
  78        [FRA_FWMASK]    = { .type = NLA_U32 }, \
  79        [FRA_TABLE]     = { .type = NLA_U32 }, \
  80        [FRA_GOTO]      = { .type = NLA_U32 }
  81
  82static inline void fib_rule_get(struct fib_rule *rule)
  83{
  84        atomic_inc(&rule->refcnt);
  85}
  86
  87static inline void fib_rule_put_rcu(struct rcu_head *head)
  88{
  89        struct fib_rule *rule = container_of(head, struct fib_rule, rcu);
  90        release_net(rule->fr_net);
  91        kfree(rule);
  92}
  93
  94static inline void fib_rule_put(struct fib_rule *rule)
  95{
  96        if (atomic_dec_and_test(&rule->refcnt))
  97                call_rcu(&rule->rcu, fib_rule_put_rcu);
  98}
  99
 100static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
 101{
 102        if (nla[FRA_TABLE])
 103                return nla_get_u32(nla[FRA_TABLE]);
 104        return frh->table;
 105}
 106
 107extern int fib_rules_register(struct fib_rules_ops *);
 108extern void fib_rules_unregister(struct fib_rules_ops *);
 109extern void                     fib_rules_cleanup_ops(struct fib_rules_ops *);
 110
 111extern int                      fib_rules_lookup(struct fib_rules_ops *,
 112                                                 struct flowi *, int flags,
 113                                                 struct fib_lookup_arg *);
 114extern int                      fib_default_rule_add(struct fib_rules_ops *,
 115                                                     u32 pref, u32 table,
 116                                                     u32 flags);
 117#endif
 118