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 #include <net/fib_notifier.h>
  12
  13 struct fib_kuid_range {
  14         kuid_t start;
  15         kuid_t end;
  16 };
  17
  18 struct fib_rule {
  19         struct list_head        list;
  20         int                     iifindex;
  21         int                     oifindex;
  22         u32                     mark;
  23         u32                     mark_mask;
  24         u32                     flags;
  25         u32                     table;
  26         u8                      action;
  27         u8                      l3mdev;
  28         /* 2 bytes hole, try to use */
  29         u32                     target;
  30         __be64                  tun_id;
  31         struct fib_rule __rcu   *ctarget;
  32         struct net              *fr_net;
  33
  34         refcount_t              refcnt;
  35         u32                     pref;
  36         int                     suppress_ifgroup;
  37         int                     suppress_prefixlen;
  38         char                    iifname[IFNAMSIZ];
  39         char                    oifname[IFNAMSIZ];
  40         struct fib_kuid_range   uid_range;
  41         struct rcu_head         rcu;
  42 };
  43
  44 struct fib_lookup_arg {
  45         void                    *lookup_ptr;
  46         void                    *result;
  47         struct fib_rule         *rule;
  48         u32                     table;
  49         int                     flags;
  50 #define FIB_LOOKUP_NOREF                1
  51 #define FIB_LOOKUP_IGNORE_LINKSTATE     2
  52 };
  53
  54 struct fib_rules_ops {
  55         int                     family;
  56         struct list_head        list;
  57         int                     rule_size;
  58         int                     addr_size;
  59         int                     unresolved_rules;
  60         int                     nr_goto_rules;
  61         unsigned int            fib_rules_seq;
  62
  63         int                     (*action)(struct fib_rule *,
  64                                           struct flowi *, int,
  65                                           struct fib_lookup_arg *);
  66         bool                    (*suppress)(struct fib_rule *,
  67                                             struct fib_lookup_arg *);
  68         int                     (*match)(struct fib_rule *,
  69                                          struct flowi *, int);
  70         int                     (*configure)(struct fib_rule *,
  71                                              struct sk_buff *,
  72                                              struct fib_rule_hdr *,
  73                                              struct nlattr **);
  74         int                     (*delete)(struct fib_rule *);
  75         int                     (*compare)(struct fib_rule *,
  76                                            struct fib_rule_hdr *,
  77                                            struct nlattr **);
  78         int                     (*fill)(struct fib_rule *, struct sk_buff *,
  79                                         struct fib_rule_hdr *);
  80         size_t                  (*nlmsg_payload)(struct fib_rule *);
  81
  82         /* Called after modifications to the rules set, must flush
  83          * the route cache if one exists. */
  84         void                    (*flush_cache)(struct fib_rules_ops *ops);
  85
  86         int                     nlgroup;
  87         const struct nla_policy *policy;
  88         struct list_head        rules_list;
  89         struct module           *owner;
  90         struct net              *fro_net;
  91         struct rcu_head         rcu;
  92 };
  93
  94 struct fib_rule_notifier_info {
  95         struct fib_notifier_info info; /* must be first */
  96         struct fib_rule *rule;
  97 };
  98
  99 #define FRA_GENERIC_POLICY \
 100         [FRA_IIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
 101         [FRA_OIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
 102         [FRA_PRIORITY]  = { .type = NLA_U32 }, \
 103         [FRA_FWMARK]    = { .type = NLA_U32 }, \
 104         [FRA_FWMASK]    = { .type = NLA_U32 }, \
 105         [FRA_TABLE]     = { .type = NLA_U32 }, \
 106         [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \
 107         [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
 108         [FRA_GOTO]      = { .type = NLA_U32 }, \
 109         [FRA_L3MDEV]    = { .type = NLA_U8 }, \
 110         [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) }
 111
 112 static inline void fib_rule_get(struct fib_rule *rule)
 113 {
 114         refcount_inc(&rule->refcnt);
 115 }
 116
 117 static inline void fib_rule_put(struct fib_rule *rule)
 118 {
 119         if (refcount_dec_and_test(&rule->refcnt))
 120                 kfree_rcu(rule, rcu);
 121 }
 122
 123 #ifdef CONFIG_NET_L3_MASTER_DEV
 124 static inline u32 fib_rule_get_table(struct fib_rule *rule,
 125                                      struct fib_lookup_arg *arg)
 126 {
 127         return rule->l3mdev ? arg->table : rule->table;
 128 }
 129 #else
 130 static inline u32 fib_rule_get_table(struct fib_rule *rule,
 131                                      struct fib_lookup_arg *arg)
 132 {
 133         return rule->table;
 134 }
 135 #endif
 136
 137 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
 138 {
 139         if (nla[FRA_TABLE])
 140                 return nla_get_u32(nla[FRA_TABLE]);
 141         return frh->table;
 142 }
 143
 144 struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
 145                                          struct net *);
 146 void fib_rules_unregister(struct fib_rules_ops *);
 147
 148 int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
 149                      struct fib_lookup_arg *);
 150 int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
 151                          u32 flags);
 152 bool fib_rule_matchall(const struct fib_rule *rule);
 153 int fib_rules_dump(struct net *net, struct notifier_block *nb, int family);
 154 unsigned int fib_rules_seq_read(struct net *net, int family);
 155
 156 int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
 157                    struct netlink_ext_ack *extack);
 158 int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
 159                    struct netlink_ext_ack *extack);
 160 #endif