[PKTGEN]: Respect hard_header_len of device.

Don't assume 16.

Found by Ben Greear.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 2 deletions

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 3827f881f429..da16f8fd1494 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -1860,13 +1860,14 @@ static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
          */
         mod_cur_headers(pkt_dev);
 
-        skb = alloc_skb(pkt_dev->cur_pkt_size + 64 + 16, GFP_ATOMIC);
+        datalen = (odev->hard_header_len + 16) & ~0xf;
+        skb = alloc_skb(pkt_dev->cur_pkt_size + 64 + datalen, GFP_ATOMIC);
         if (!skb) {
                 sprintf(pkt_dev->result, "No memory");
                 return NULL;
         }
 
-        skb_reserve(skb, 16);
+        skb_reserve(skb, datalen);
 
         /*  Reserve for ethernet and IP header  */
         eth = (__u8 *) skb_push(skb, 14);