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openvswitch: Pad OVS_PACKET_ATTR_PACKET if linear copy was performed

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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);