[net] net/packet: fix incoming receive for L3 devices without visible hard header

[Eyal Birger <eyal.birger@gmail.com>]

In the patchset merged by commit b9fcf0a0d826
("Merge branch 'support-AF_PACKET-for-layer-3-devices'") L3 devices which
did not have header_ops were given one for the purpose of protocol parsing
on af_packet transmit path.

That change made af_packet receive path regard these devices as having a
visible L3 header and therefore aligned incoming skb->data to point to the
skb's mac_header. Some devices, such as ipip, xfrmi, and others, do not
reset their mac_header prior to ingress and therefore their incoming
packets became malformed.

Ideally these devices would reset their mac headers, or af_packet would be
able to rely on dev->hard_header_len being 0 for such cases, but it seems
this is not the case.

Fix by changing af_packet RX ll visibility criteria to include the
existence of a '.create()' header operation, which is used when creating
a device hard header - via dev_hard_header() - by upper layers, and does
not exist in these L3 devices.

Fixes: b9fcf0a0d826 ("Merge branch 'support-AF_PACKET-for-layer-3-devices'")
Signed-off-by: Eyal Birger <eyal.birger@gmail.com>
---
 net/packet/af_packet.c | 28 ++++++++++++++++++++--------
 1 file changed, 20 insertions(+), 8 deletions(-)

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index cefbd50c1090..a241059fd536 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -93,8 +93,8 @@
 
 /*
    Assumptions:
-   - If the device has no dev->header_ops, there is no LL header visible
-     above the device. In this case, its hard_header_len should be 0.
+   - If the device has no dev->header_ops->create, there is no LL header
+     visible above the device. In this case, its hard_header_len should be 0.
      The device may prepend its own header internally. In this case, its
      needed_headroom should be set to the space needed for it to add its
      internal header.
@@ -108,21 +108,21 @@
 On receive:
 -----------
 
-Incoming, dev->header_ops != NULL
+Incoming, dev->header_ops != NULL && dev->header_ops->create != NULL
    mac_header -> ll header
    data       -> data
 
-Outgoing, dev->header_ops != NULL
+Outgoing, dev->header_ops != NULL && dev->header_ops->create != NULL
    mac_header -> ll header
    data       -> ll header
 
-Incoming, dev->header_ops == NULL
+Incoming, dev->header_ops == NULL || dev->header_ops->create == NULL
    mac_header -> data
      However drivers often make it point to the ll header.
      This is incorrect because the ll header should be invisible to us.
    data       -> data
 
-Outgoing, dev->header_ops == NULL
+Outgoing, dev->header_ops == NULL || dev->header_ops->create == NULL
    mac_header -> data. ll header is invisible to us.
    data       -> data
 
@@ -272,6 +272,18 @@ static bool packet_use_direct_xmit(const struct packet_sock *po)
 	return po->xmit == packet_direct_xmit;
 }
 
+static bool packet_ll_header_rcv_visible(const struct net_device *dev)
+{
+	/* The device has an explicit notion of ll header,
+	 * exported to higher levels
+	 *
+	 * Otherwise, the device hides details of its frame
+	 * structure, so that corresponding packet head is
+	 * never delivered to user.
+	 */
+	return dev->header_ops && dev->header_ops->create;
+}
+
 static u16 packet_pick_tx_queue(struct sk_buff *skb)
 {
 	struct net_device *dev = skb->dev;
@@ -2069,7 +2081,7 @@ static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
 
 	skb->dev = dev;
 
-	if (dev->header_ops) {
+	if (packet_ll_header_rcv_visible(dev)) {
 		/* The device has an explicit notion of ll header,
 		 * exported to higher levels.
 		 *
@@ -2198,7 +2210,7 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
 	if (!net_eq(dev_net(dev), sock_net(sk)))
 		goto drop;
 
-	if (dev->header_ops) {
+	if (packet_ll_header_rcv_visible(dev)) {
 		if (sk->sk_type != SOCK_DGRAM)
 			skb_push(skb, skb->data - skb_mac_header(skb));
 		else if (skb->pkt_type == PACKET_OUTGOING) {
-- 
2.25.1