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         kuid_t                  uid_start;
  33         kuid_t                  uid_end;
  34         struct rcu_head         rcu;
  35 };
  36
  37 struct fib_lookup_arg {
  38         void                    *lookup_ptr;
  39         void                    *result;
  40         struct fib_rule         *rule;
  41         int                     flags;
  42 #define FIB_LOOKUP_NOREF                1
  43 #define FIB_LOOKUP_IGNORE_LINKSTATE     2
  44 };
  45
  46 struct fib_rules_ops {
  47         int                     family;
  48         struct list_head        list;
  49         int                     rule_size;
  50         int                     addr_size;
  51         int                     unresolved_rules;
  52         int                     nr_goto_rules;
  53
  54         int                     (*action)(struct fib_rule *,
  55                                           struct flowi *, int,
  56                                           struct fib_lookup_arg *);
  57         bool                    (*suppress)(struct fib_rule *,
  58                                             struct fib_lookup_arg *);
  59         int                     (*match)(struct fib_rule *,
  60                                          struct flowi *, int);
  61         int                     (*configure)(struct fib_rule *,
  62                                              struct sk_buff *,
  63                                              struct fib_rule_hdr *,
  64                                              struct nlattr **);
  65         int                     (*delete)(struct fib_rule *);
  66         int                     (*compare)(struct fib_rule *,
  67                                            struct fib_rule_hdr *,
  68                                            struct nlattr **);
  69         int                     (*fill)(struct fib_rule *, struct sk_buff *,
  70                                         struct fib_rule_hdr *);
  71         size_t                  (*nlmsg_payload)(struct fib_rule *);
  72
  73         /* Called after modifications to the rules set, must flush
  74          * the route cache if one exists. */
  75         void                    (*flush_cache)(struct fib_rules_ops *ops);
  76
  77         int                     nlgroup;
  78         const struct nla_policy *policy;
  79         struct list_head        rules_list;
  80         struct module           *owner;
  81         struct net              *fro_net;
  82         struct rcu_head         rcu;
  83 };
  84
  85 #define FRA_GENERIC_POLICY \
  86         [FRA_IIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
  87         [FRA_OIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
  88         [FRA_PRIORITY]  = { .type = NLA_U32 }, \
  89         [FRA_FWMARK]    = { .type = NLA_U32 }, \
  90         [FRA_FWMASK]    = { .type = NLA_U32 }, \
  91         [FRA_TABLE]     = { .type = NLA_U32 }, \
  92         [FRA_GOTO]      = { .type = NLA_U32 }, \
  93         [FRA_UID_START] = { .type = NLA_U32 }, \
  94         [FRA_UID_END]   = { .type = NLA_U32 }, \
  95         [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \
  96         [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
  97         [FRA_GOTO]      = { .type = NLA_U32 }
  98
  99 static inline void fib_rule_get(struct fib_rule *rule)
 100 {
 101         atomic_inc(&rule->refcnt);
 102 }
 103
 104 static inline void fib_rule_put(struct fib_rule *rule)
 105 {
 106         if (atomic_dec_and_test(&rule->refcnt))
 107                 kfree_rcu(rule, 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 struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
 118                                          struct net *);
 119 void fib_rules_unregister(struct fib_rules_ops *);
 120
 121 int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
 122                      struct fib_lookup_arg *);
 123 int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
 124                          u32 flags);
 125 #endif