For tap device new skb is created and data from the current skb is
copied to it. This adds copying data from non-linear skb to new
the skb.
Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
---
net/vmw_vsock/virtio_transport_common.c | 31 ++++++++++++++++++++++---
1 file changed, 28 insertions(+), 3 deletions(-)
@@ -101,6 +101,27 @@ virtio_transport_alloc_skb(struct virtio_vsock_pkt_info *info,
return NULL;
}
+int virtio_transport_nl_skb_to_iov(struct sk_buff *skb,
+ struct iov_iter *iov_iter,
+ size_t len,
+ bool peek);
+static void virtio_transport_copy_nonlinear_skb(struct sk_buff *skb,
+ void *dst,
+ size_t len)
+{
+ struct iov_iter iov_iter = { 0 };
+ struct iovec iovec;
+
+ iovec.iov_base = dst;
+ iovec.iov_len = len;
+
+ iov_iter.iter_type = ITER_IOVEC;
+ iov_iter.iov = &iovec;
+ iov_iter.nr_segs = 1;
+
+ virtio_transport_nl_skb_to_iov(skb, &iov_iter, len, false);
+}
+
/* Packet capture */
static struct sk_buff *virtio_transport_build_skb(void *opaque)
{
@@ -109,7 +130,6 @@ static struct sk_buff *virtio_transport_build_skb(void *opaque)
struct af_vsockmon_hdr *hdr;
struct sk_buff *skb;
size_t payload_len;
- void *payload_buf;
/* A packet could be split to fit the RX buffer, so we can retrieve
* the payload length from the header and the buffer pointer taking
@@ -117,7 +137,6 @@ static struct sk_buff *virtio_transport_build_skb(void *opaque)
*/
pkt_hdr = virtio_vsock_hdr(pkt);
payload_len = pkt->len;
- payload_buf = pkt->data;
skb = alloc_skb(sizeof(*hdr) + sizeof(*pkt_hdr) + payload_len,
GFP_ATOMIC);
@@ -160,7 +179,13 @@ static struct sk_buff *virtio_transport_build_skb(void *opaque)
skb_put_data(skb, pkt_hdr, sizeof(*pkt_hdr));
if (payload_len) {
- skb_put_data(skb, payload_buf, payload_len);
+ if (skb_is_nonlinear(pkt)) {
+ void *data = skb_put(skb, payload_len);
+
+ virtio_transport_copy_nonlinear_skb(pkt, data, payload_len);
+ } else {
+ skb_put_data(skb, pkt->data, payload_len);
+ }
}
return skb;