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openvswitch: Pad OVS_PACKET_ATTR_PACKET if linear copy was performed 

While the zerocopy method is correctly omitted if user space
does not support unaligned Netlink messages. The attribute is
still not padded correctly as skb_zerocopy() will not ensure
padding and the attribute size is no longer pre calculated
though nla_reserve() which ensured padding previously.

This patch applies appropriate padding if a linear data copy
was performed in skb_zerocopy().

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Zoltan Kiss <zoltan.kiss@citrix.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
This commit is contained in:
Thomas Graf 2014-01-14 16:27:49 +00:00 committed by Jesse Gross
parent bce3ea81d5
commit aea0bb4f8e
1 changed files with 8 additions and 0 deletions
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8
net/openvswitch/datapath.c
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@ -466,6 +466,14 @@ static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
skb_zerocopy(user_skb, skb, skb->len, hlen);
/* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len;
if (plen > 0)
memset(skb_put(user_skb, plen), 0, plen);
}
((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);