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 <linux/refcount.h>
   9 #include <net/flow.h>
  10 #include <net/rtnetlink.h>
  11
  12 struct fib_kuid_range {
  13         kuid_t start;
  14         kuid_t end;
  15 };
  16
  17 struct fib_rule {
  18         struct list_head        list;
  19         int                     iifindex;
  20         int                     oifindex;
  21         u32                     mark;
  22         u32                     mark_mask;
  23         u32                     flags;
  24         u32                     table;
  25         u8                      action;
  26         u8                      l3mdev;
  27         /* 2 bytes hole, try to use */
  28         u32                     target;
  29         __be64                  tun_id;
  30         struct fib_rule __rcu   *ctarget;
  31         struct net              *fr_net;
  32
  33         refcount_t              refcnt;
  34         u32                     pref;
  35         int                     suppress_ifgroup;
  36         int                     suppress_prefixlen;
  37         char                    iifname[IFNAMSIZ];
  38         char                    oifname[IFNAMSIZ];
  39         struct fib_kuid_range   uid_range;
  40         struct rcu_head         rcu;
  41 };
  42
  43 struct fib_lookup_arg {
  44         void                    *lookup_ptr;
  45         void                    *result;
  46         struct fib_rule         *rule;
  47         u32                     table;
  48         int                     flags;
  49 #define FIB_LOOKUP_NOREF                1
  50 #define FIB_LOOKUP_IGNORE_LINKSTATE     2
  51 };
  52
  53 struct fib_rules_ops {
  54         int                     family;
  55         struct list_head        list;
  56         int                     rule_size;
  57         int                     addr_size;
  58         int                     unresolved_rules;
  59         int                     nr_goto_rules;
  60
  61         int                     (*action)(struct fib_rule *,
  62                                           struct flowi *, int,
  63                                           struct fib_lookup_arg *);
  64         bool                    (*suppress)(struct fib_rule *,
  65                                             struct fib_lookup_arg *);
  66         int                     (*match)(struct fib_rule *,
  67                                          struct flowi *, int);
  68         int                     (*configure)(struct fib_rule *,
  69                                              struct sk_buff *,
  70                                              struct fib_rule_hdr *,
  71                                              struct nlattr **);
  72         int                     (*delete)(struct fib_rule *);
  73         int                     (*compare)(struct fib_rule *,
  74                                            struct fib_rule_hdr *,
  75                                            struct nlattr **);
  76         int                     (*fill)(struct fib_rule *, struct sk_buff *,
  77                                         struct fib_rule_hdr *);
  78         size_t                  (*nlmsg_payload)(struct fib_rule *);
  79
  80         /* Called after modifications to the rules set, must flush
  81          * the route cache if one exists. */
  82         void                    (*flush_cache)(struct fib_rules_ops *ops);
  83
  84         int                     nlgroup;
  85         const struct nla_policy *policy;
  86         struct list_head        rules_list;
  87         struct module           *owner;
  88         struct net              *fro_net;
  89         struct rcu_head         rcu;
  90 };
  91
  92 #define FRA_GENERIC_POLICY \
  93         [FRA_IIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
  94         [FRA_OIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
  95         [FRA_PRIORITY]  = { .type = NLA_U32 }, \
  96         [FRA_FWMARK]    = { .type = NLA_U32 }, \
  97         [FRA_FWMASK]    = { .type = NLA_U32 }, \
  98         [FRA_TABLE]     = { .type = NLA_U32 }, \
  99         [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \
 100         [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
 101         [FRA_GOTO]      = { .type = NLA_U32 }, \
 102         [FRA_L3MDEV]    = { .type = NLA_U8 }, \
 103         [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) }
 104
 105 static inline void fib_rule_get(struct fib_rule *rule)
 106 {
 107         refcount_inc(&rule->refcnt);
 108 }
 109
 110 static inline void fib_rule_put(struct fib_rule *rule)
 111 {
 112         if (refcount_dec_and_test(&rule->refcnt))
 113                 kfree_rcu(rule, rcu);
 114 }
 115
 116 #ifdef CONFIG_NET_L3_MASTER_DEV
 117 static inline u32 fib_rule_get_table(struct fib_rule *rule,
 118                                      struct fib_lookup_arg *arg)
 119 {
 120         return rule->l3mdev ? arg->table : rule->table;
 121 }
 122 #else
 123 static inline u32 fib_rule_get_table(struct fib_rule *rule,
 124                                      struct fib_lookup_arg *arg)
 125 {
 126         return rule->table;
 127 }
 128 #endif
 129
 130 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
 131 {
 132         if (nla[FRA_TABLE])
 133                 return nla_get_u32(nla[FRA_TABLE]);
 134         return frh->table;
 135 }
 136
 137 struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
 138                                          struct net *);
 139 void fib_rules_unregister(struct fib_rules_ops *);
 140
 141 int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
 142                      struct fib_lookup_arg *);
 143 int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
 144                          u32 flags);
 145 bool fib_rule_matchall(const struct fib_rule *rule);
 146
 147 int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
 148                    struct netlink_ext_ack *extack);
 149 int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
 150                    struct netlink_ext_ack *extack);
 151 #endif