ipv4: arp announce, arp_proxy and windows ip conflict verification

Windows (XP at least) hosts on boot, with configured static ip, performing
address conflict detection, which is defined in RFC3927.
Here is quote of important information:

"
An ARP announcement is identical to the ARP Probe described above,
except    that now the sender and target IP addresses are both set
to the host's newly selected IPv4 address.
"

But it same time this goes wrong with RFC5227.
"
The 'sender IP address' field MUST be set to all zeroes; this is to avoid
polluting ARP caches in other hosts on the same link in the case
where the address turns out to be already in use by another host.
"

When ARP proxy configured, it must not answer to both cases, because
it is address conflict verification in any case. For Windows it is just
causing to detect false "ip conflict". Already there is code for RFC5227, so
just trivially we just check also if source ip == target ip.

Signed-off-by: Denys Fedoryshchenko <denys@visp.net.lb>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 9c220323f3534b0e6dd4397a547cb3040f11ba0b..f11931c1838176de514d5e70666ebeef180e7183 100644 (file)
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -801,8 +801,11 @@ static int arp_process(struct sk_buff *skb)
  *  cache.
  */
 
-       /* Special case: IPv4 duplicate address detection packet (RFC2131) */
-       if (sip == 0) {
+       /*
+        *  Special case: IPv4 duplicate address detection packet (RFC2131)
+        *  and Gratuitous ARP/ARP Announce. (RFC3927, Section 2.4)
+        */
+       if (sip == 0 || tip == sip) {
                if (arp->ar_op == htons(ARPOP_REQUEST) &&
                    inet_addr_type(net, tip) == RTN_LOCAL &&
                    !arp_ignore(in_dev, sip, tip))