VisionFive2 Linux kernel

StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)

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author: Ilya Maximets <> 2023-07-03 19:53:29 +0200 committer: Greg Kroah-Hartman <> 2023-07-19 16:36:47 +0200 commit: bc229885125741f5d88550e4e6851a475015ec33 parent: 90b9e7202676742ede5f1e6c46000a53c6a6c4c0
Commit Summary:
xsk: Honor SO_BINDTODEVICE on bind
2 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/networking/af_xdp.rst b/Documentation/networking/af_xdp.rst
index 247c6c4127e9..1cc35de336a4 100644
--- a/Documentation/networking/af_xdp.rst
+++ b/Documentation/networking/af_xdp.rst
@@ -433,6 +433,15 @@ start N bytes into the buffer leaving the first N bytes for the
 application to use. The final option is the flags field, but it will
 be dealt with in separate sections for each UMEM flag.
+This is a generic SOL_SOCKET option that can be used to tie AF_XDP
+socket to a particular network interface.  It is useful when a socket
+is created by a privileged process and passed to a non-privileged one.
+Once the option is set, kernel will refuse attempts to bind that socket
+to a different interface.  Updating the value requires CAP_NET_RAW.
 XDP_STATISTICS getsockopt
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index cc1e7f15fa73..32dd55b9ce8a 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -886,6 +886,7 @@ static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
 	struct sock *sk = sock->sk;
 	struct xdp_sock *xs = xdp_sk(sk);
 	struct net_device *dev;
+	int bound_dev_if;
 	u32 flags, qid;
 	int err = 0;
@@ -899,6 +900,10 @@ static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
 		return -EINVAL;
+	bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
+	if (bound_dev_if && bound_dev_if != sxdp->sxdp_ifindex)
+		return -EINVAL;
 	if (xs->state != XSK_READY) {