tun: correct header offsets in napi frags mode

Tun in IFF_NAPI_FRAGS mode calls napi_gro_frags. Unlike netif_rx and
netif_gro_receive, this expects skb->data to point to the mac layer.

But skb_probe_transport_header, __skb_get_hash_symmetric, and
xdp_do_generic in tun_get_user need skb->data to point to the network
header. Flow dissection also needs skb->protocol set, so
eth_type_trans has to be called.

Ensure the link layer header lies in linear as eth_type_trans pulls
ETH_HLEN. Then take the same code paths for frags as for not frags.
Push the link layer header back just before calling napi_gro_frags.

By pulling up to ETH_HLEN from frag0 into linear, this disables the
frag0 optimization in the special case when IFF_NAPI_FRAGS is used
with zero length iov[0] (and thus empty skb->linear).

Fixes: 90e33d459407 ("tun: enable napi_gro_frags() for TUN/TAP driver")
Signed-off-by: Willem de Bruijn <willemb@google.com>
Acked-by: Petar Penkov <ppenkov@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index c54f967..b0ab882 100644 (file)
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1872,8 +1872,11 @@ drop:
                skb->dev = tun->dev;
                break;
        case IFF_TAP:
-               if (!frags)
-                       skb->protocol = eth_type_trans(skb, tun->dev);
+               if (frags && !pskb_may_pull(skb, ETH_HLEN)) {
+                       err = -ENOMEM;
+                       goto drop;
+               }
+               skb->protocol = eth_type_trans(skb, tun->dev);
                break;
        }
 
@@ -1930,9 +1933,12 @@ drop:
        }
 
        if (frags) {
+               u32 headlen;
+
                /* Exercise flow dissector code path. */
-               u32 headlen = eth_get_headlen(tun->dev, skb->data,
-                                             skb_headlen(skb));
+               skb_push(skb, ETH_HLEN);
+               headlen = eth_get_headlen(tun->dev, skb->data,
+                                         skb_headlen(skb));
 
                if (unlikely(headlen > skb_headlen(skb))) {
                        this_cpu_inc(tun->pcpu_stats->rx_dropped);