[PATCHv3 13/16] staging: usbip: Wrap kernel_sendmsg()/recvmsg()
From: Dominik Paulus
Date: Sat Sep 28 2013 - 13:43:42 EST
This adds two simple wrappers around kernel_sendmsg() and
kernel_recvmsg() that can be extended to perform additional
cryptographic operations on the data before sending it.
Signed-off-by: Dominik Paulus <dominik.paulus@xxxxxx>
Signed-off-by: Tobias Polzer <tobias.polzer@xxxxxx>
---
drivers/staging/usbip/stub_rx.c | 2 +-
drivers/staging/usbip/stub_tx.c | 6 ++--
drivers/staging/usbip/usbip_common.c | 66 ++++++++++++++++++++----------------
drivers/staging/usbip/usbip_common.h | 7 +++-
drivers/staging/usbip/vhci_rx.c | 2 +-
drivers/staging/usbip/vhci_tx.c | 4 +--
6 files changed, 48 insertions(+), 39 deletions(-)
diff --git a/drivers/staging/usbip/stub_rx.c b/drivers/staging/usbip/stub_rx.c
index db48a78..6ba9969 100644
--- a/drivers/staging/usbip/stub_rx.c
+++ b/drivers/staging/usbip/stub_rx.c
@@ -553,7 +553,7 @@ static void stub_rx_pdu(struct usbip_device *ud)
memset(&pdu, 0, sizeof(pdu));
/* receive a pdu header */
- ret = usbip_recv(ud->tcp_socket, &pdu, sizeof(pdu));
+ ret = usbip_recv(ud, &pdu, sizeof(pdu));
if (ret != sizeof(pdu)) {
dev_err(dev, "recv a header, %d\n", ret);
usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
diff --git a/drivers/staging/usbip/stub_tx.c b/drivers/staging/usbip/stub_tx.c
index cd5326a..9a9f9e6 100644
--- a/drivers/staging/usbip/stub_tx.c
+++ b/drivers/staging/usbip/stub_tx.c
@@ -257,8 +257,7 @@ static int stub_send_ret_submit(struct stub_device *sdev)
iovnum++;
}
- ret = kernel_sendmsg(sdev->ud.tcp_socket, &msg,
- iov, iovnum, txsize);
+ ret = usbip_sendmsg(&sdev->ud, &msg, iov, iovnum, txsize);
if (ret != txsize) {
dev_err(&sdev->interface->dev,
"sendmsg failed!, retval %d for %zd\n",
@@ -332,8 +331,7 @@ static int stub_send_ret_unlink(struct stub_device *sdev)
iov[0].iov_len = sizeof(pdu_header);
txsize += sizeof(pdu_header);
- ret = kernel_sendmsg(sdev->ud.tcp_socket, &msg, iov,
- 1, txsize);
+ ret = usbip_sendmsg(&sdev->ud, &msg, iov, 1, txsize);
if (ret != txsize) {
dev_err(&sdev->interface->dev,
"sendmsg failed!, retval %d for %zd\n",
diff --git a/drivers/staging/usbip/usbip_common.c b/drivers/staging/usbip/usbip_common.c
index e3fc749..83ec279 100644
--- a/drivers/staging/usbip/usbip_common.c
+++ b/drivers/staging/usbip/usbip_common.c
@@ -339,7 +339,7 @@ void usbip_dump_header(struct usbip_header *pdu)
EXPORT_SYMBOL_GPL(usbip_dump_header);
/* Receive data over TCP/IP. */
-int usbip_recv(struct socket *sock, void *buf, int size)
+int usbip_recv(struct usbip_device *ud, void *buf, int size)
{
int result;
struct msghdr msg;
@@ -352,34 +352,29 @@ int usbip_recv(struct socket *sock, void *buf, int size)
usbip_dbg_xmit("enter\n");
- if (!sock || !buf || !size) {
- pr_err("invalid arg, sock %p buff %p size %d\n", sock, buf,
+ if (!ud || !buf || !size) {
+ pr_err("invalid arg, ud %p buff %p size %d\n", ud, buf,
size);
return -EINVAL;
}
- do {
- sock->sk->sk_allocation = GFP_NOIO;
- iov.iov_base = buf;
- iov.iov_len = size;
- msg.msg_name = NULL;
- msg.msg_namelen = 0;
- msg.msg_control = NULL;
- msg.msg_controllen = 0;
- msg.msg_namelen = 0;
- msg.msg_flags = MSG_NOSIGNAL;
-
- result = kernel_recvmsg(sock, &msg, &iov, 1, size, MSG_WAITALL);
- if (result <= 0) {
- pr_debug("receive sock %p buf %p size %u ret %d total %d\n",
- sock, buf, size, result, total);
- goto err;
- }
-
- size -= result;
- buf += result;
- total += result;
- } while (size > 0);
+ ud->tcp_socket->sk->sk_allocation = GFP_NOIO;
+ iov.iov_base = buf;
+ iov.iov_len = size;
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_namelen = 0;
+ msg.msg_flags = MSG_NOSIGNAL;
+
+ result = usbip_recvmsg(ud, &msg, &iov, 1, size, MSG_WAITALL);
+
+ if (result < 0) {
+ pr_debug("receive sock %p buf %p size %u ret %d total %d\n",
+ ud->tcp_socket, buf, size, result, total);
+ return result;
+ }
if (usbip_dbg_flag_xmit) {
if (!in_interrupt())
@@ -393,9 +388,6 @@ int usbip_recv(struct socket *sock, void *buf, int size)
osize, result, size, total);
}
- return total;
-
-err:
return result;
}
EXPORT_SYMBOL_GPL(usbip_recv);
@@ -634,6 +626,20 @@ static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso,
}
}
+int usbip_recvmsg(struct usbip_device *ud, struct msghdr *msg,
+ struct kvec *vec, size_t num, size_t size, int flags)
+{
+ return kernel_recvmsg(ud->tcp_socket, msg, vec, num, size, flags);
+}
+EXPORT_SYMBOL_GPL(usbip_recvmsg);
+
+int usbip_sendmsg(struct usbip_device *ud, struct msghdr *msg,
+ struct kvec *vec, size_t num, size_t size)
+{
+ return kernel_sendmsg(ud->tcp_socket, msg, vec, num, size);
+}
+EXPORT_SYMBOL_GPL(usbip_sendmsg);
+
/* must free buffer */
struct usbip_iso_packet_descriptor*
usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen)
@@ -680,7 +686,7 @@ int usbip_recv_iso(struct usbip_device *ud, struct urb *urb)
if (!buff)
return -ENOMEM;
- ret = usbip_recv(ud->tcp_socket, buff, size);
+ ret = usbip_recv(ud, buff, size);
if (ret != size) {
dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n",
ret);
@@ -785,7 +791,7 @@ int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
if (!(size > 0))
return 0;
- ret = usbip_recv(ud->tcp_socket, urb->transfer_buffer, size);
+ ret = usbip_recv(ud, urb->transfer_buffer, size);
if (ret != size) {
dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
if (ud->side == USBIP_STUB) {
diff --git a/drivers/staging/usbip/usbip_common.h b/drivers/staging/usbip/usbip_common.h
index 96c87ee..bdad29f 100644
--- a/drivers/staging/usbip/usbip_common.h
+++ b/drivers/staging/usbip/usbip_common.h
@@ -323,7 +323,7 @@ struct usbip_device {
void usbip_dump_urb(struct urb *purb);
void usbip_dump_header(struct usbip_header *pdu);
-int usbip_recv(struct socket *sock, void *buf, int size);
+int usbip_recv(struct usbip_device *ui, void *buf, int size);
struct socket *sockfd_to_socket(unsigned int sockfd);
void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
@@ -344,6 +344,11 @@ void usbip_stop_eh(struct usbip_device *ud);
void usbip_event_add(struct usbip_device *ud, unsigned long event);
int usbip_event_happened(struct usbip_device *ud);
+int usbip_recvmsg(struct usbip_device *ui, struct msghdr *msg,
+ struct kvec *vec, size_t num, size_t size, int flags);
+int usbip_sendmsg(struct usbip_device *ui, struct msghdr *msg,
+ struct kvec *vec, size_t num, size_t size);
+
static inline int interface_to_busnum(struct usb_interface *interface)
{
struct usb_device *udev = interface_to_usbdev(interface);
diff --git a/drivers/staging/usbip/vhci_rx.c b/drivers/staging/usbip/vhci_rx.c
index d07fcb5..34706a8 100644
--- a/drivers/staging/usbip/vhci_rx.c
+++ b/drivers/staging/usbip/vhci_rx.c
@@ -207,7 +207,7 @@ static void vhci_rx_pdu(struct usbip_device *ud)
memset(&pdu, 0, sizeof(pdu));
/* receive a pdu header */
- ret = usbip_recv(ud->tcp_socket, &pdu, sizeof(pdu));
+ ret = usbip_recv(ud, &pdu, sizeof(pdu));
if (ret < 0) {
if (ret == -ECONNRESET)
pr_info("connection reset by peer\n");
diff --git a/drivers/staging/usbip/vhci_tx.c b/drivers/staging/usbip/vhci_tx.c
index 409fd99..09663e6 100644
--- a/drivers/staging/usbip/vhci_tx.c
+++ b/drivers/staging/usbip/vhci_tx.c
@@ -115,7 +115,7 @@ static int vhci_send_cmd_submit(struct vhci_device *vdev)
txsize += len;
}
- ret = kernel_sendmsg(vdev->ud.tcp_socket, &msg, iov, 3, txsize);
+ ret = usbip_sendmsg(&vdev->ud, &msg, iov, 3, txsize);
if (ret != txsize) {
pr_err("sendmsg failed!, ret=%d for %zd\n", ret,
txsize);
@@ -184,7 +184,7 @@ static int vhci_send_cmd_unlink(struct vhci_device *vdev)
iov[0].iov_len = sizeof(pdu_header);
txsize += sizeof(pdu_header);
- ret = kernel_sendmsg(vdev->ud.tcp_socket, &msg, iov, 1, txsize);
+ ret = usbip_sendmsg(&vdev->ud, &msg, iov, 1, txsize);
if (ret != txsize) {
pr_err("sendmsg failed!, ret=%d for %zd\n", ret,
txsize);
--
1.8.4
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