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Commit 55bf9984 authored by Luiz Augusto von Dentz's avatar Luiz Augusto von Dentz Committed by Greg Kroah-Hartman
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Bluetooth: Add bt_skb_sendmsg helper 



commit 38f64f650dc0e44c146ff88d15a7339efa325918 upstream.

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: default avatarLuiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
Cc: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 015af30d

include/net/bluetooth/bluetooth.h

+28 −0
Original line number Diff line number Diff line
@@ -370,6 +370,34 @@ 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, size_t mtu,

					     size_t headroom, size_t tailroom)

{

	struct sk_buff *skb;

	size_t size = min_t(size_t, len, mtu);

	int err;



	skb = bt_skb_send_alloc(sk, size + headroom + tailroom,

				msg->msg_flags & MSG_DONTWAIT, &err);

	if (!skb)

		return ERR_PTR(err);



	skb_reserve(skb, headroom);

	skb_tailroom_reserve(skb, mtu, tailroom);



	if (!copy_from_iter_full(skb_put(skb, size), size, &msg->msg_iter)) {

		kfree_skb(skb);

		return ERR_PTR(-EFAULT);

	}



	skb->priority = sk->sk_priority;



	return skb;

}



int bt_to_errno(u16 code);



void hci_sock_set_flag(struct sock *sk, int nr);