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[RFC,1/4] Bluetooth: Add bt_skb_sendmsg helper

Message ID 20210831011528.225877-1-luiz.dentz@gmail.com
State New
Headers show
Series [RFC,1/4] Bluetooth: Add bt_skb_sendmsg helper | expand

Commit Message

Luiz Augusto von Dentz Aug. 31, 2021, 1:15 a.m. UTC 
From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

bt_skb_sendmsg helps takes care of allocation the skb and copying the
the contents of msg over to the skb while checking for possible errors
so it should be safe to call it without holding lock_sock.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
---
 include/net/bluetooth/bluetooth.h | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
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Patch

diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h
index 9125effbf448..1bfb5d3d24dd 100644
--- a/include/net/bluetooth/bluetooth.h
+++ b/include/net/bluetooth/bluetooth.h
@@ -420,6 +420,29 @@  static inline struct sk_buff *bt_skb_send_alloc(struct sock *sk,
 	return NULL;
 }
 
+/* Shall not be called with lock_sock held */
+static inline struct sk_buff *bt_skb_sendmsg(struct sock *sk,
+					     struct msghdr *msg,
+					     size_t len, int reserve)
+{
+	struct sk_buff *skb;
+	int err;
+
+	skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err);
+	if (!skb)
+		return ERR_PTR(err);
+
+	if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
+		kfree_skb(skb);
+		return ERR_PTR(-EFAULT);
+	}
+
+	skb_reserve(skb, reserve);
+	skb->priority = sk->sk_priority;
+
+	return skb;
+}
+
 int bt_to_errno(u16 code);
 
 void hci_sock_set_flag(struct sock *sk, int nr);