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         int                     iifindex;
  19         int                     oifindex;
  20         u32                     mark;
  21         u32                     mark_mask;
  22         u32                     flags;
  23         u32                     table;
  24         u8                      action;
  25         /* 3 bytes hole, try to use */
  26         u32                     target;
  27         __be64                  tun_id;
  28         struct fib_rule __rcu   *ctarget;
  29         struct net              *fr_net;
  30
  31         atomic_t                refcnt;
  32         u32                     pref;
  33         int                     suppress_ifgroup;
  34         int                     suppress_prefixlen;
  35         char                    iifname[IFNAMSIZ];
  36         char                    oifname[IFNAMSIZ];
  37         struct fib_kuid_range   uid_range;
  38         struct rcu_head         rcu;
  39 };
  40
  41 struct fib_lookup_arg {
  42         void                    *lookup_ptr;
  43         void                    *result;
  44         struct fib_rule         *rule;
  45         int                     flags;
  46 #define FIB_LOOKUP_NOREF                1
  47 #define FIB_LOOKUP_IGNORE_LINKSTATE     2
  48 };
  49
  50 struct fib_rules_ops {
  51         int                     family;
  52         struct list_head        list;
  53         int                     rule_size;
  54         int                     addr_size;
  55         int                     unresolved_rules;
  56         int                     nr_goto_rules;
  57
  58         int                     (*action)(struct fib_rule *,
  59                                           struct flowi *, int,
  60                                           struct fib_lookup_arg *);
  61         bool                    (*suppress)(struct fib_rule *,
  62                                             struct fib_lookup_arg *);
  63         int                     (*match)(struct fib_rule *,
  64                                          struct flowi *, int);
  65         int                     (*configure)(struct fib_rule *,
  66                                              struct sk_buff *,
  67                                              struct fib_rule_hdr *,
  68                                              struct nlattr **);
  69         int                     (*delete)(struct fib_rule *);
  70         int                     (*compare)(struct fib_rule *,
  71                                            struct fib_rule_hdr *,
  72                                            struct nlattr **);
  73         int                     (*fill)(struct fib_rule *, struct sk_buff *,
  74                                         struct fib_rule_hdr *);
  75         size_t                  (*nlmsg_payload)(struct fib_rule *);
  76
  77         /* Called after modifications to the rules set, must flush
  78          * the route cache if one exists. */
  79         void                    (*flush_cache)(struct fib_rules_ops *ops);
  80
  81         int                     nlgroup;
  82         const struct nla_policy *policy;
  83         struct list_head        rules_list;
  84         struct module           *owner;
  85         struct net              *fro_net;
  86         struct rcu_head         rcu;
  87 };
  88
  89 #define FRA_GENERIC_POLICY \
  90         [FRA_IIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
  91         [FRA_OIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
  92         [FRA_PRIORITY]  = { .type = NLA_U32 }, \
  93         [FRA_FWMARK]    = { .type = NLA_U32 }, \
  94         [FRA_FWMASK]    = { .type = NLA_U32 }, \
  95         [FRA_TABLE]     = { .type = NLA_U32 }, \
  96         [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \
  97         [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
  98         [FRA_GOTO]      = { .type = NLA_U32 }, \
  99         [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) }
 100
 101 static inline void fib_rule_get(struct fib_rule *rule)
 102 {
 103         atomic_inc(&rule->refcnt);
 104 }
 105
 106 static inline void fib_rule_put(struct fib_rule *rule)
 107 {
 108         if (atomic_dec_and_test(&rule->refcnt))
 109                 kfree_rcu(rule, rcu);
 110 }
 111
 112 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
 113 {
 114         if (nla[FRA_TABLE])
 115                 return nla_get_u32(nla[FRA_TABLE]);
 116         return frh->table;
 117 }
 118
 119 struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
 120                                          struct net *);
 121 void fib_rules_unregister(struct fib_rules_ops *);
 122
 123 int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
 124                      struct fib_lookup_arg *);
 125 int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
 126                          u32 flags);
 127 #endif