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IPoIB: Fix ipoib_hard_header() return value

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If you have a patched up dhcp server (and dhclient), they will use
AF_PACKET/SOCK_DGRAM pair to send dhcp packets over IPoIB.

However, when testing an upstream kernel, this has been broken for a
very long time (I tested 2.6.34, 2.6.38, 3.0, 3.1, 3.8, HEAD).

It turns out that the hard_header routine in ipoib is not following
the API and is returning 0 even when it pushed data onto the skb.
This then causes af_packet.c to overwrite the header just pushed with
data from user space.

Fixing this gets DHCP working on IPoIB.

Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Doug Ledford 2013-04-01 21:25:30 +00:00 committed by Roland Dreier
parent 41ef2d5678
commit 83bdd3b96c
1 changed files with 1 additions and 1 deletions
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2
drivers/infiniband/ulp/ipoib/ipoib_main.c
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@ -828,7 +828,7 @@ static int ipoib_hard_header(struct sk_buff *skb,
*/
memcpy(cb->hwaddr, daddr, INFINIBAND_ALEN);
return 0;
return sizeof *header;
}
static void ipoib_set_mcast_list(struct net_device *dev)