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