kernel/include/net/fib_rules.h

   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
  11 struct 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
  35 struct 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
  44 struct 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
  94 static inline void fib_rule_get(struct fib_rule *rule)
  95 {
  96         atomic_inc(&rule->refcnt);
  97 }
  98
  99 static 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
 105 static 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
 112 struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
 113                                          struct net *);
 114 void fib_rules_unregister(struct fib_rules_ops *);
 115
 116 int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
 117                      struct fib_lookup_arg *);
 118 int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
 119                          u32 flags);
 120 #endif