net: add sock_set_reuseport

Add a helper to directly set the SO_REUSEPORT sockopt from kernel space
without going through a fake uaccess.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/sock.h b/include/net/sock.h
index c997289..d994daa 100644 (file)
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -2695,6 +2695,7 @@ void sock_set_keepalive(struct sock *sk);
 void sock_set_priority(struct sock *sk, u32 priority);
 void sock_set_rcvbuf(struct sock *sk, int val);
 void sock_set_reuseaddr(struct sock *sk);
+void sock_set_reuseport(struct sock *sk);
 void sock_set_sndtimeo(struct sock *sk, s64 secs);
 
 #endif /* _SOCK_H */

diff --git a/net/core/sock.c b/net/core/sock.c
index 3c6ebf9..2ca3425 100644 (file)
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -729,6 +729,14 @@ void sock_set_reuseaddr(struct sock *sk)
 }
 EXPORT_SYMBOL(sock_set_reuseaddr);
 
+void sock_set_reuseport(struct sock *sk)
+{
+       lock_sock(sk);
+       sk->sk_reuseport = true;
+       release_sock(sk);
+}
+EXPORT_SYMBOL(sock_set_reuseport);
+
 void sock_no_linger(struct sock *sk)
 {
        lock_sock(sk);

diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 30082cd..399848c 100644 (file)
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -1594,21 +1594,6 @@ static int xs_get_random_port(void)
        return rand + min;
 }
 
-/**
- * xs_set_reuseaddr_port - set the socket's port and address reuse options
- * @sock: socket
- *
- * Note that this function has to be called on all sockets that share the
- * same port, and it must be called before binding.
- */
-static void xs_sock_set_reuseport(struct socket *sock)
-{
-       int opt = 1;
-
-       kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT,
-                       (char *)&opt, sizeof(opt));
-}
-
 static unsigned short xs_sock_getport(struct socket *sock)
 {
        struct sockaddr_storage buf;
@@ -1801,7 +1786,7 @@ static struct socket *xs_create_sock(struct rpc_xprt *xprt,
        xs_reclassify_socket(family, sock);
 
        if (reuseport)
-               xs_sock_set_reuseport(sock);
+               sock_set_reuseport(sock->sk);
 
        err = xs_bind(transport, sock);
        if (err) {