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         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 *       ctarget;
  24         char                    iifname[IFNAMSIZ];
  25         char                    oifname[IFNAMSIZ];
  26         struct rcu_head         rcu;
  27         struct net *            fr_net;
  28 };
  29
  30 struct fib_lookup_arg {
  31         void                    *lookup_ptr;
  32         void                    *result;
  33         struct fib_rule         *rule;
  34 };
  35
  36 struct fib_rules_ops {
  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 fib_rule_hdr *,
  52                                              struct nlattr **);
  53         int                     (*compare)(struct fib_rule *,
  54                                            struct fib_rule_hdr *,
  55                                            struct nlattr **);
  56         int                     (*fill)(struct fib_rule *, struct sk_buff *,
  57                                         struct fib_rule_hdr *);
  58         u32                     (*default_pref)(struct fib_rules_ops *ops);
  59         size_t                  (*nlmsg_payload)(struct fib_rule *);
  60
  61         /* Called after modifications to the rules set, must flush
  62          * the route cache if one exists. */
  63         void                    (*flush_cache)(struct fib_rules_ops *ops);
  64
  65         int                     nlgroup;
  66         const struct nla_policy *policy;
  67         struct list_head        rules_list;
  68         struct module           *owner;
  69         struct net              *fro_net;
  70         struct rcu_head         rcu;
  71 };
  72
  73 #define FRA_GENERIC_POLICY \
  74         [FRA_IIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
  75         [FRA_OIFNAME]   = { .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
  82 static inline void fib_rule_get(struct fib_rule *rule)
  83 {
  84         atomic_inc(&rule->refcnt);
  85 }
  86
  87 static 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
  94 static 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
 100 static 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
 107 extern struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, struct net *);
 108 extern void fib_rules_unregister(struct fib_rules_ops *);
 109 extern void                     fib_rules_cleanup_ops(struct fib_rules_ops *);
 110
 111 extern int                      fib_rules_lookup(struct fib_rules_ops *,
 112                                                  struct flowi *, int flags,
 113                                                  struct fib_lookup_arg *);
 114 extern int                      fib_default_rule_add(struct fib_rules_ops *,
 115                                                      u32 pref, u32 table,
 116                                                      u32 flags);
 117 extern u32                      fib_default_rule_pref(struct fib_rules_ops *ops);
 118 #endif