1 files changed, 57 insertions, 0 deletions
diff --git a/include/net/sock_reuseport.h b/include/net/sock_reuseport.h
new file mode 100644
index 000000000..3eac185ae
--- /dev/null
+++ b/include/net/sock_reuseport.h
@@ -0,0 +1,57 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _SOCK_REUSEPORT_H
+#define _SOCK_REUSEPORT_H
+
+#include <linux/filter.h>
+#include <linux/skbuff.h>
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <net/sock.h>
+
+extern spinlock_t reuseport_lock;
+
+struct sock_reuseport {
+	struct rcu_head		rcu;
+
+	u16			max_socks;	/* length of socks */
+	u16			num_socks;	/* elements in socks */
+	/* The last synq overflow event timestamp of this
+	 * reuse->socks[] group.
+	 */
+	unsigned int		synq_overflow_ts;
+	/* ID stays the same even after the size of socks[] grows. */
+	unsigned int		reuseport_id;
+	unsigned int		bind_inany:1;
+	unsigned int		has_conns:1;
+	struct bpf_prog __rcu	*prog;		/* optional BPF sock selector */
+	struct sock		*socks[];	/* array of sock pointers */
+};
+
+extern int reuseport_alloc(struct sock *sk, bool bind_inany);
+extern int reuseport_add_sock(struct sock *sk, struct sock *sk2,
+			      bool bind_inany);
+extern void reuseport_detach_sock(struct sock *sk);
+extern struct sock *reuseport_select_sock(struct sock *sk,
+					  u32 hash,
+					  struct sk_buff *skb,
+					  int hdr_len);
+extern int reuseport_attach_prog(struct sock *sk, struct bpf_prog *prog);
+extern int reuseport_detach_prog(struct sock *sk);
+
+static inline bool reuseport_has_conns(struct sock *sk)
+{
+	struct sock_reuseport *reuse;
+	bool ret = false;
+
+	rcu_read_lock();
+	reuse = rcu_dereference(sk->sk_reuseport_cb);
+	if (reuse && reuse->has_conns)
+		ret = true;
+	rcu_read_unlock();
+
+	return ret;
+}
+
+void reuseport_has_conns_set(struct sock *sk);
+
+#endif  /* _SOCK_REUSEPORT_H */