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-rw-r--r--include/net/fib_rules.h205
1 files changed, 205 insertions, 0 deletions
diff --git a/include/net/fib_rules.h b/include/net/fib_rules.h
new file mode 100644
index 000000000..82da359bc
--- /dev/null
+++ b/include/net/fib_rules.h
@@ -0,0 +1,205 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __NET_FIB_RULES_H
+#define __NET_FIB_RULES_H
+
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/netdevice.h>
+#include <linux/fib_rules.h>
+#include <linux/refcount.h>
+#include <net/flow.h>
+#include <net/rtnetlink.h>
+#include <net/fib_notifier.h>
+#include <linux/indirect_call_wrapper.h>
+
+struct fib_kuid_range {
+ kuid_t start;
+ kuid_t end;
+};
+
+struct fib_rule {
+ struct list_head list;
+ int iifindex;
+ int oifindex;
+ u32 mark;
+ u32 mark_mask;
+ u32 flags;
+ u32 table;
+ u8 action;
+ u8 l3mdev;
+ u8 proto;
+ u8 ip_proto;
+ u32 target;
+ __be64 tun_id;
+ struct fib_rule __rcu *ctarget;
+ struct net *fr_net;
+
+ refcount_t refcnt;
+ u32 pref;
+ int suppress_ifgroup;
+ int suppress_prefixlen;
+ char iifname[IFNAMSIZ];
+ char oifname[IFNAMSIZ];
+ struct fib_kuid_range uid_range;
+ struct fib_rule_port_range sport_range;
+ struct fib_rule_port_range dport_range;
+ struct rcu_head rcu;
+};
+
+struct fib_lookup_arg {
+ void *lookup_ptr;
+ const void *lookup_data;
+ void *result;
+ struct fib_rule *rule;
+ u32 table;
+ int flags;
+#define FIB_LOOKUP_NOREF 1
+#define FIB_LOOKUP_IGNORE_LINKSTATE 2
+};
+
+struct fib_rules_ops {
+ int family;
+ struct list_head list;
+ int rule_size;
+ int addr_size;
+ int unresolved_rules;
+ int nr_goto_rules;
+ unsigned int fib_rules_seq;
+
+ int (*action)(struct fib_rule *,
+ struct flowi *, int,
+ struct fib_lookup_arg *);
+ bool (*suppress)(struct fib_rule *, int,
+ struct fib_lookup_arg *);
+ int (*match)(struct fib_rule *,
+ struct flowi *, int);
+ int (*configure)(struct fib_rule *,
+ struct sk_buff *,
+ struct fib_rule_hdr *,
+ struct nlattr **,
+ struct netlink_ext_ack *);
+ int (*delete)(struct fib_rule *);
+ int (*compare)(struct fib_rule *,
+ struct fib_rule_hdr *,
+ struct nlattr **);
+ int (*fill)(struct fib_rule *, struct sk_buff *,
+ struct fib_rule_hdr *);
+ size_t (*nlmsg_payload)(struct fib_rule *);
+
+ /* Called after modifications to the rules set, must flush
+ * the route cache if one exists. */
+ void (*flush_cache)(struct fib_rules_ops *ops);
+
+ int nlgroup;
+ struct list_head rules_list;
+ struct module *owner;
+ struct net *fro_net;
+ struct rcu_head rcu;
+};
+
+struct fib_rule_notifier_info {
+ struct fib_notifier_info info; /* must be first */
+ struct fib_rule *rule;
+};
+
+static inline void fib_rule_get(struct fib_rule *rule)
+{
+ refcount_inc(&rule->refcnt);
+}
+
+static inline void fib_rule_put(struct fib_rule *rule)
+{
+ if (refcount_dec_and_test(&rule->refcnt))
+ kfree_rcu(rule, rcu);
+}
+
+#ifdef CONFIG_NET_L3_MASTER_DEV
+static inline u32 fib_rule_get_table(struct fib_rule *rule,
+ struct fib_lookup_arg *arg)
+{
+ return rule->l3mdev ? arg->table : rule->table;
+}
+#else
+static inline u32 fib_rule_get_table(struct fib_rule *rule,
+ struct fib_lookup_arg *arg)
+{
+ return rule->table;
+}
+#endif
+
+static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
+{
+ if (nla[FRA_TABLE])
+ return nla_get_u32(nla[FRA_TABLE]);
+ return frh->table;
+}
+
+static inline bool fib_rule_port_range_set(const struct fib_rule_port_range *range)
+{
+ return range->start != 0 && range->end != 0;
+}
+
+static inline bool fib_rule_port_inrange(const struct fib_rule_port_range *a,
+ __be16 port)
+{
+ return ntohs(port) >= a->start &&
+ ntohs(port) <= a->end;
+}
+
+static inline bool fib_rule_port_range_valid(const struct fib_rule_port_range *a)
+{
+ return a->start != 0 && a->end != 0 && a->end < 0xffff &&
+ a->start <= a->end;
+}
+
+static inline bool fib_rule_port_range_compare(struct fib_rule_port_range *a,
+ struct fib_rule_port_range *b)
+{
+ return a->start == b->start &&
+ a->end == b->end;
+}
+
+static inline bool fib_rule_requires_fldissect(struct fib_rule *rule)
+{
+ return rule->iifindex != LOOPBACK_IFINDEX && (rule->ip_proto ||
+ fib_rule_port_range_set(&rule->sport_range) ||
+ fib_rule_port_range_set(&rule->dport_range));
+}
+
+struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
+ struct net *);
+void fib_rules_unregister(struct fib_rules_ops *);
+
+int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
+ struct fib_lookup_arg *);
+int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
+ u32 flags);
+bool fib_rule_matchall(const struct fib_rule *rule);
+int fib_rules_dump(struct net *net, struct notifier_block *nb, int family,
+ struct netlink_ext_ack *extack);
+unsigned int fib_rules_seq_read(struct net *net, int family);
+
+int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack);
+int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack);
+
+INDIRECT_CALLABLE_DECLARE(int fib6_rule_match(struct fib_rule *rule,
+ struct flowi *fl, int flags));
+INDIRECT_CALLABLE_DECLARE(int fib4_rule_match(struct fib_rule *rule,
+ struct flowi *fl, int flags));
+
+INDIRECT_CALLABLE_DECLARE(int fib6_rule_action(struct fib_rule *rule,
+ struct flowi *flp, int flags,
+ struct fib_lookup_arg *arg));
+INDIRECT_CALLABLE_DECLARE(int fib4_rule_action(struct fib_rule *rule,
+ struct flowi *flp, int flags,
+ struct fib_lookup_arg *arg));
+
+INDIRECT_CALLABLE_DECLARE(bool fib6_rule_suppress(struct fib_rule *rule,
+ int flags,
+ struct fib_lookup_arg *arg));
+INDIRECT_CALLABLE_DECLARE(bool fib4_rule_suppress(struct fib_rule *rule,
+ int flags,
+ struct fib_lookup_arg *arg));
+#endif
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