netdev - [RFC PATCH net-next 13/33] mptcp: Add setsockopt()/getsockopt() socket operations

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Message-Id: <20190617225808.665-14-mathew.j.martineau@linux.intel.com>
Date:   Mon, 17 Jun 2019 15:57:48 -0700
From:   Mat Martineau <mathew.j.martineau@...ux.intel.com>
To:     edumazet@...gle.com, netdev@...r.kernel.org
Cc:     Peter Krystad <peter.krystad@...ux.intel.com>, cpaasch@...le.com,
        fw@...len.de, pabeni@...hat.com, dcaratti@...hat.com,
        matthieu.baerts@...sares.net
Subject: [RFC PATCH net-next 13/33] mptcp: Add setsockopt()/getsockopt() socket operations

From: Peter Krystad <peter.krystad@...ux.intel.com>

Signed-off-by: Peter Krystad <peter.krystad@...ux.intel.com>
---
 net/mptcp/protocol.c | 48 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 6596e594fa5f..3215601b9c43 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -131,6 +131,52 @@ static void mptcp_destroy(struct sock *sk)
 	token_destroy(msk->token);
 }
 
+static int mptcp_setsockopt(struct sock *sk, int level, int optname,
+			    char __user *uoptval, unsigned int optlen)
+{
+	struct mptcp_sock *msk = mptcp_sk(sk);
+	struct socket *subflow;
+	char __kernel *optval;
+
+	pr_debug("msk=%p", msk);
+	if (msk->connection_list) {
+		subflow = msk->connection_list;
+		pr_debug("conn_list->subflow=%p", subflow_ctx(subflow->sk));
+	} else {
+		subflow = msk->subflow;
+		pr_debug("subflow=%p", subflow_ctx(subflow->sk));
+	}
+
+	/* will be treated as __user in tcp_setsockopt */
+	optval = (char __kernel __force *)uoptval;
+
+	return kernel_setsockopt(subflow, level, optname, optval, optlen);
+}
+
+static int mptcp_getsockopt(struct sock *sk, int level, int optname,
+			    char __user *uoptval, int __user *uoption)
+{
+	struct mptcp_sock *msk = mptcp_sk(sk);
+	struct socket *subflow;
+	char __kernel *optval;
+	int __kernel *option;
+
+	pr_debug("msk=%p", msk);
+	if (msk->connection_list) {
+		subflow = msk->connection_list;
+		pr_debug("conn_list->subflow=%p", subflow_ctx(subflow->sk));
+	} else {
+		subflow = msk->subflow;
+		pr_debug("subflow=%p", subflow_ctx(subflow->sk));
+	}
+
+	/* will be treated as __user in tcp_getsockopt */
+	optval = (char __kernel __force *)uoptval;
+	option = (int __kernel __force *)uoption;
+
+	return kernel_getsockopt(subflow, level, optname, optval, option);
+}
+
 static int mptcp_get_port(struct sock *sk, unsigned short snum)
 {
 	struct mptcp_sock *msk = mptcp_sk(sk);
@@ -162,6 +208,8 @@ static struct proto mptcp_prot = {
 	.init		= mptcp_init_sock,
 	.close		= mptcp_close,
 	.accept		= mptcp_accept,
+	.setsockopt	= mptcp_setsockopt,
+	.getsockopt	= mptcp_getsockopt,
 	.shutdown	= tcp_shutdown,
 	.destroy	= mptcp_destroy,
 	.sendmsg	= mptcp_sendmsg,
-- 
2.22.0