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[NETLINK]: Fix ACK processing after netlink_dump_start 

Revert to original netlink behavior. Do not reply with ACK if the
netlink dump has bees successfully started.

libnl has been broken by the cd40b7d398
The following command reproduce the problem:
   /nl-route-get 192.168.1.1

Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Denis V. Lunev 2007-10-23 20:29:25 -07:00 committed by David S. Miller
parent be7f827360
commit 5c58298c25
1 changed files with 12 additions and 4 deletions
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16
net/netlink/af_netlink.c
View File

@ -1565,7 +1565,11 @@ int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
netlink_dump(sk);
sock_put(sk);
return 0;
/* We successfully started a dump, by returning -EINTR we
* signal not to send ACK even if it was requested.
*/
return -EINTR;
}
void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err)
@ -1619,17 +1623,21 @@ int netlink_rcv_skb(struct sk_buff *skb, int (*cb)(struct sk_buff *,
/* Only requests are handled by the kernel */
if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
goto skip;
goto ack;
/* Skip control messages */
if (nlh->nlmsg_type < NLMSG_MIN_TYPE)
goto skip;
goto ack;
err = cb(skb, nlh);
skip:
if (err == -EINTR)
goto skip;
ack:
if (nlh->nlmsg_flags & NLM_F_ACK || err)
netlink_ack(skb, nlh, err);
skip:
msglen = NLMSG_ALIGN(nlh->nlmsg_len);
if (msglen > skb->len)
msglen = skb->len;