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_kuid_range {
  12         kuid_t start;
  13         kuid_t end;
  14 };
  15
  16 struct fib_rule {
  17         struct list_head        list;
  18         atomic_t                refcnt;
  19         int                     iifindex;
  20         int                     oifindex;
  21         u32                     mark;
  22         u32                     mark_mask;
  23         u32                     pref;
  24         u32                     flags;
  25         u32                     table;
  26         u8                      action;
  27         u32                     target;
  28         struct fib_rule __rcu   *ctarget;
  29         char                    iifname[IFNAMSIZ];
  30         char                    oifname[IFNAMSIZ];
  31         struct fib_kuid_range   uid_range;
  32         struct rcu_head         rcu;
  33         struct net *            fr_net;
  34 };
  35
  36 struct fib_lookup_arg {
  37         void                    *lookup_ptr;
  38         void                    *result;
  39         struct fib_rule         *rule;
  40         int                     flags;
  41 #define FIB_LOOKUP_NOREF        1
  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         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_GOTO]      = { .type = NLA_U32 }, \
  90         [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) }
  91
  92 static inline void fib_rule_get(struct fib_rule *rule)
  93 {
  94         atomic_inc(&rule->refcnt);
  95 }
  96
  97 static inline void fib_rule_put_rcu(struct rcu_head *head)
  98 {
  99         struct fib_rule *rule = container_of(head, struct fib_rule, rcu);
 100         release_net(rule->fr_net);
 101         kfree(rule);
 102 }
 103
 104 static inline void fib_rule_put(struct fib_rule *rule)
 105 {
 106         if (atomic_dec_and_test(&rule->refcnt))
 107                 call_rcu(&rule->rcu, fib_rule_put_rcu);
 108 }
 109
 110 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
 111 {
 112         if (nla[FRA_TABLE])
 113                 return nla_get_u32(nla[FRA_TABLE]);
 114         return frh->table;
 115 }
 116
 117 extern struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, struct net *);
 118 extern void fib_rules_unregister(struct fib_rules_ops *);
 119
 120 extern int                      fib_rules_lookup(struct fib_rules_ops *,
 121                                                  struct flowi *, int flags,
 122                                                  struct fib_lookup_arg *);
 123 extern int                      fib_default_rule_add(struct fib_rules_ops *,
 124                                                      u32 pref, u32 table,
 125                                                      u32 flags);
 126 extern u32                      fib_default_rule_pref(struct fib_rules_ops *ops);
 127 #endif