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