[PATCH RFC] tun: export underlying socket

["Michael S. Tsirkin" <mst@redhat.com>]

Tun device looks similar to a packet socket
in that both pass complete frames from/to userspace.

This patch fills in enough fields in the socket underlying tun driver
to support sendmsg/recvmsg operations, and exports access to this socket
to modules.

This way, code using raw sockets to inject packets
into a physical device, can support injecting
packets into host network stack almost without modification.

First user of this interface will be vhost virtualization
accelerator.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---

This patch is on top of net-next master.
An alternative approach would be to add an ioctl to tun, to export the
underlying socket to userspace: a uniform way to work with a network
device and the host stack might be useful there, as well.
Kernel users could then do sockfd_lookup to get the socket.
I decided against it for now as it requires more code.
Please comment.

 drivers/net/tun.c      |   78 +++++++++++++++++++++++++++++++++++++++++++----
 include/linux/if_tun.h |   14 ++++++++
 2 files changed, 85 insertions(+), 7 deletions(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 589a44a..76f5faa 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -151,6 +151,7 @@ static int tun_attach(struct tun_struct *tun, struct file *file)
 	err = 0;
 	tfile->tun = tun;
 	tun->tfile = tfile;
+	tun->socket.file = file;
 	dev_hold(tun->dev);
 	sock_hold(tun->socket.sk);
 	atomic_inc(&tfile->count);
@@ -165,6 +166,7 @@ static void __tun_detach(struct tun_struct *tun)
 	/* Detach from net device */
 	netif_tx_lock_bh(tun->dev);
 	tun->tfile = NULL;
+	tun->socket.file = NULL;
 	netif_tx_unlock_bh(tun->dev);
 
 	/* Drop read queue */
@@ -750,7 +752,7 @@ static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
 	len = min_t(int, skb->len, len);
 
 	skb_copy_datagram_const_iovec(skb, 0, iv, total, len);
-	total += len;
+	total += skb->len;
 
 	tun->dev->stats.tx_packets++;
 	tun->dev->stats.tx_bytes += len;
@@ -758,12 +760,10 @@ static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
 	return total;
 }
 
-static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
-			    unsigned long count, loff_t pos)
+static ssize_t tun_do_read(struct tun_struct *tun,
+			   struct kiocb *iocb, const struct iovec *iv,
+			   unsigned long count, int noblock)
 {
-	struct file *file = iocb->ki_filp;
-	struct tun_file *tfile = file->private_data;
-	struct tun_struct *tun = __tun_get(tfile);
 	DECLARE_WAITQUEUE(wait, current);
 	struct sk_buff *skb;
 	ssize_t len, ret = 0;
@@ -785,7 +785,7 @@ static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
 
 		/* Read frames from the queue */
 		if (!(skb=skb_dequeue(&tun->socket.sk->sk_receive_queue))) {
-			if (file->f_flags & O_NONBLOCK) {
+			if (noblock) {
 				ret = -EAGAIN;
 				break;
 			}
@@ -813,6 +813,21 @@ static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
 	remove_wait_queue(&tun->socket.wait, &wait);
 
 out:
+	return ret;
+}
+
+static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
+			    unsigned long count, loff_t pos)
+{
+	struct file *file = iocb->ki_filp;
+	struct tun_file *tfile = file->private_data;
+	struct tun_struct *tun = __tun_get(tfile);
+	ssize_t ret;
+
+	if (!tun)
+		return -EBADFD;
+	ret = tun_do_read(tun, iocb, iv, count, file->f_flags & O_NONBLOCK);
+	ret = min_t(ssize_t, ret, count);
 	tun_put(tun);
 	return ret;
 }
@@ -865,6 +880,37 @@ static void tun_sock_destruct(struct sock *sk)
 	free_netdev(container_of(sk, struct tun_sock, sk)->tun->dev);
 }
 
+static int tun_sendmsg(struct kiocb *iocb, struct socket *sock,
+		       struct msghdr *m, size_t total_len)
+{
+	struct tun_struct *tun = container_of(sock, struct tun_struct, socket);
+	return tun_get_user(tun, m->msg_iov, total_len,
+			    m->msg_flags & MSG_DONTWAIT);
+}
+
+static int tun_recvmsg(struct kiocb *iocb, struct socket *sock,
+		       struct msghdr *m, size_t total_len,
+		       int flags)
+{
+	struct tun_struct *tun = container_of(sock, struct tun_struct, socket);
+	int ret;
+	if (flags & ~(MSG_DONTWAIT|MSG_TRUNC))
+		return -EINVAL;
+	ret = tun_do_read(tun, iocb, m->msg_iov, total_len,
+			  flags & MSG_DONTWAIT);
+	if (ret > total_len) {
+		m->msg_flags |= MSG_TRUNC;
+		ret = flags & MSG_TRUNC ? ret : total_len;
+	}
+	return ret;
+}
+
+/* Ops structure to mimic raw sockets with tun */
+static const struct proto_ops tun_socket_ops = {
+	.sendmsg = tun_sendmsg,
+	.recvmsg = tun_recvmsg,
+};
+
 static struct proto tun_proto = {
 	.name		= "tun",
 	.owner		= THIS_MODULE,
@@ -982,6 +1028,7 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
 			goto err_free_dev;
 
 		init_waitqueue_head(&tun->socket.wait);
+		tun->socket.ops = &tun_socket_ops;
 		sock_init_data(&tun->socket, sk);
 		sk->sk_write_space = tun_sock_write_space;
 		sk->sk_sndbuf = INT_MAX;
@@ -1483,6 +1530,23 @@ static void tun_cleanup(void)
 	rtnl_link_unregister(&tun_link_ops);
 }
 
+/* Get an underlying socket object from tun file.  Returns error unless file is
+ * attached to a device.  The returned object works like a packet socket, it
+ * can be used for sock_sendmsg/sock_recvmsg.  The caller is responsible for
+ * holding a reference to the file for as long as the socket is in use. */
+struct socket *tun_get_socket(struct file *file)
+{
+	struct tun_struct *tun;
+	if (file->f_op != &tun_fops)
+		return ERR_PTR(-EINVAL);
+	tun = tun_get(file);
+	if (!tun)
+		return ERR_PTR(-EBADFD);
+	tun_put(tun);
+	return &tun->socket;
+}
+EXPORT_SYMBOL_GPL(tun_get_socket);
+
 module_init(tun_init);
 module_exit(tun_cleanup);
 MODULE_DESCRIPTION(DRV_DESCRIPTION);
diff --git a/include/linux/if_tun.h b/include/linux/if_tun.h
index 3f5fd52..404abe0 100644
--- a/include/linux/if_tun.h
+++ b/include/linux/if_tun.h
@@ -86,4 +86,18 @@ struct tun_filter {
 	__u8   addr[0][ETH_ALEN];
 };
 
+#ifdef __KERNEL__
+#if defined(CONFIG_TUN) || defined(CONFIG_TUN_MODULE)
+struct socket *tun_get_socket(struct file *);
+#else
+#include <linux/err.h>
+#include <linux/errno.h>
+struct file;
+struct socket;
+static inline struct socket *tun_get_socket(struct file *f)
+{
+	return ERR_PTR(-EINVAL);
+}
+#endif /* CONFIG_TUN */
+#endif /* __KERNEL__ */
 #endif /* __IF_TUN_H */
-- 
1.6.2.5