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| author | Willem de Bruijn <willemb@google.com> | 2016-03-08 15:18:54 -0500 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-07-10 23:07:03 -0400 |
| commit | 686263920d666722c42b5347123113bd85ec67cc (patch) | |
| tree | 072d1324dba89badc8d48c1ef68dbfcf7fc63663 /drivers/net/Space.c | |
| parent | 5284ee1e9da2f8f78b5b800109ef4c436c58876d (diff) | |
macvtap: always pass ethernet header in linear
[ Upstream commit 8e2ad4113ce4671686740f808ff2795395c39eef ]
The stack expects link layer headers in the skb linear section.
Macvtap can create skbs with llheader in frags in edge cases:
when (IFF_VNET_HDR is off or vnet_hdr.hdr_len < ETH_HLEN) and
prepad + len > PAGE_SIZE and vnet_hdr.flags has no or bad csum.
Add checks to ensure linear is always at least ETH_HLEN.
At this point, len is already ensured to be >= ETH_HLEN.
For backwards compatiblity, rounds up short vnet_hdr.hdr_len.
This differs from tap and packet, which return an error.
Fixes b9fb9ee07e67 ("macvtap: add GSO/csum offload support")
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'drivers/net/Space.c')
0 files changed, 0 insertions, 0 deletions