From 5c58298c2536252ab95aa2b1497ab47eb878ca5d Mon Sep 17 00:00:00 2001 From: "Denis V. Lunev" Date: Tue, 23 Oct 2007 20:29:25 -0700 Subject: [PATCH 1/1] [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 cd40b7d3983c708aabe3d3008ec64ffce56d33b0 The following command reproduce the problem: /nl-route-get 192.168.1.1 Signed-off-by: Denis V. Lunev Acked-by: Thomas Graf Signed-off-by: David S. Miller --- net/netlink/af_netlink.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c index 98e313e..3252729 100644 --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -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; -- 1.8.2.3