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