Update current receive logic for SEQPACKET support: performs
check for packet and socket types on receive(if mismatch, then
reset connection).
Signed-off-by: Arseny Krasnov <[email protected]>
---
v9 -> v10:
1) Commit message updated.
2) Comment updated.
3) Updated way to to set 'last_pkt' flags.
net/vmw_vsock/virtio_transport_common.c | 30 ++++++++++++++++++++++---
1 file changed, 27 insertions(+), 3 deletions(-)
diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
index 61349b2ea7fe..a6f8b0f39775 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -165,6 +165,14 @@ void virtio_transport_deliver_tap_pkt(struct virtio_vsock_pkt *pkt)
}
EXPORT_SYMBOL_GPL(virtio_transport_deliver_tap_pkt);
+static u16 virtio_transport_get_type(struct sock *sk)
+{
+ if (sk->sk_type == SOCK_STREAM)
+ return VIRTIO_VSOCK_TYPE_STREAM;
+ else
+ return VIRTIO_VSOCK_TYPE_SEQPACKET;
+}
+
/* This function can only be used on connecting/connected sockets,
* since a socket assigned to a transport is required.
*
@@ -979,13 +987,17 @@ virtio_transport_recv_enqueue(struct vsock_sock *vsk,
struct virtio_vsock_pkt, list);
/* If there is space in the last packet queued, we copy the
- * new packet in its buffer.
+ * new packet in its buffer(except SEQPACKET case, when we
+ * also check that last packet is not last packet of previous
+ * record).
*/
- if (pkt->len <= last_pkt->buf_len - last_pkt->len) {
+ if ((pkt->len <= last_pkt->buf_len - last_pkt->len) &&
+ !(le32_to_cpu(last_pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOR)) {
memcpy(last_pkt->buf + last_pkt->len, pkt->buf,
pkt->len);
last_pkt->len += pkt->len;
free_pkt = true;
+ last_pkt->hdr.flags |= pkt->hdr.flags;
goto out;
}
}
@@ -1151,6 +1163,12 @@ virtio_transport_recv_listen(struct sock *sk, struct virtio_vsock_pkt *pkt,
return 0;
}
+static bool virtio_transport_valid_type(u16 type)
+{
+ return (type == VIRTIO_VSOCK_TYPE_STREAM) ||
+ (type == VIRTIO_VSOCK_TYPE_SEQPACKET);
+}
+
/* We are under the virtio-vsock's vsock->rx_lock or vhost-vsock's vq->mutex
* lock.
*/
@@ -1176,7 +1194,7 @@ void virtio_transport_recv_pkt(struct virtio_transport *t,
le32_to_cpu(pkt->hdr.buf_alloc),
le32_to_cpu(pkt->hdr.fwd_cnt));
- if (le16_to_cpu(pkt->hdr.type) != VIRTIO_VSOCK_TYPE_STREAM) {
+ if (!virtio_transport_valid_type(le16_to_cpu(pkt->hdr.type))) {
(void)virtio_transport_reset_no_sock(t, pkt);
goto free_pkt;
}
@@ -1193,6 +1211,12 @@ void virtio_transport_recv_pkt(struct virtio_transport *t,
}
}
+ if (virtio_transport_get_type(sk) != le16_to_cpu(pkt->hdr.type)) {
+ (void)virtio_transport_reset_no_sock(t, pkt);
+ sock_put(sk);
+ goto free_pkt;
+ }
+
vsk = vsock_sk(sk);
lock_sock(sk);
--
2.25.1
On Thu, May 20, 2021 at 10:18:21PM +0300, Arseny Krasnov wrote:
>Update current receive logic for SEQPACKET support: performs
>check for packet and socket types on receive(if mismatch, then
>reset connection).
We also copy the flags. Please check better your commit messages.
>
>Signed-off-by: Arseny Krasnov <[email protected]>
>---
> v9 -> v10:
> 1) Commit message updated.
> 2) Comment updated.
> 3) Updated way to to set 'last_pkt' flags.
>
> net/vmw_vsock/virtio_transport_common.c | 30 ++++++++++++++++++++++---
> 1 file changed, 27 insertions(+), 3 deletions(-)
>
>diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
>index 61349b2ea7fe..a6f8b0f39775 100644
>--- a/net/vmw_vsock/virtio_transport_common.c
>+++ b/net/vmw_vsock/virtio_transport_common.c
>@@ -165,6 +165,14 @@ void virtio_transport_deliver_tap_pkt(struct virtio_vsock_pkt *pkt)
> }
> EXPORT_SYMBOL_GPL(virtio_transport_deliver_tap_pkt);
>
>+static u16 virtio_transport_get_type(struct sock *sk)
>+{
>+ if (sk->sk_type == SOCK_STREAM)
>+ return VIRTIO_VSOCK_TYPE_STREAM;
>+ else
>+ return VIRTIO_VSOCK_TYPE_SEQPACKET;
>+}
>+
> /* This function can only be used on connecting/connected sockets,
> * since a socket assigned to a transport is required.
> *
>@@ -979,13 +987,17 @@ virtio_transport_recv_enqueue(struct vsock_sock *vsk,
> struct virtio_vsock_pkt, list);
>
> /* If there is space in the last packet queued, we copy the
>- * new packet in its buffer.
>+ * new packet in its buffer(except SEQPACKET case, when we
>+ * also check that last packet is not last packet of previous
>+ * record).
Is better to explain why we don't do this for SEQPACKET, something like this:
/* If there is space in the last packet queued, we copy the
* new packet in its buffer.
* We avoid this if the last packet queued has
* VIRTIO_VSOCK_SEQ_EOR set, because it is the delimiter
* of SEQPACKET record, so `pkt` is the first packet
* of a new record.
*/
> */
>- if (pkt->len <= last_pkt->buf_len - last_pkt->len) {
>+ if ((pkt->len <= last_pkt->buf_len - last_pkt->len) &&
>+ !(le32_to_cpu(last_pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOR)) {
> memcpy(last_pkt->buf + last_pkt->len, pkt->buf,
> pkt->len);
> last_pkt->len += pkt->len;
> free_pkt = true;
>+ last_pkt->hdr.flags |= pkt->hdr.flags;
> goto out;
> }
> }
>@@ -1151,6 +1163,12 @@ virtio_transport_recv_listen(struct sock *sk, struct virtio_vsock_pkt *pkt,
> return 0;
> }
>
>+static bool virtio_transport_valid_type(u16 type)
>+{
>+ return (type == VIRTIO_VSOCK_TYPE_STREAM) ||
>+ (type == VIRTIO_VSOCK_TYPE_SEQPACKET);
>+}
>+
> /* We are under the virtio-vsock's vsock->rx_lock or vhost-vsock's vq->mutex
> * lock.
> */
>@@ -1176,7 +1194,7 @@ void virtio_transport_recv_pkt(struct virtio_transport *t,
> le32_to_cpu(pkt->hdr.buf_alloc),
> le32_to_cpu(pkt->hdr.fwd_cnt));
>
>- if (le16_to_cpu(pkt->hdr.type) != VIRTIO_VSOCK_TYPE_STREAM) {
>+ if (!virtio_transport_valid_type(le16_to_cpu(pkt->hdr.type))) {
> (void)virtio_transport_reset_no_sock(t, pkt);
> goto free_pkt;
> }
>@@ -1193,6 +1211,12 @@ void virtio_transport_recv_pkt(struct virtio_transport *t,
> }
> }
>
>+ if (virtio_transport_get_type(sk) != le16_to_cpu(pkt->hdr.type)) {
>+ (void)virtio_transport_reset_no_sock(t, pkt);
>+ sock_put(sk);
>+ goto free_pkt;
>+ }
>+
> vsk = vsock_sk(sk);
>
> lock_sock(sk);
>--
>2.25.1
>
The rest LGTM.
Stefano