linux-kernel - [PATCH][v2] net/ipv4/arp.c: Fix arp reply when sender ip 0

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Message-ID: <cac0ab7d0711200828n3548fadn48cce2837ed6a7c6@mail.gmail.com>
Date:	Tue, 20 Nov 2007 17:28:22 +0100
From:	"Jonas Danielsson" <the.sator@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	"David Miller" <davem@...emloft.net>,
	"Alexey Kuznetsov" <kuznet@....inr.ac.ru>, jmorris@...ei.org,
	netdev@...r.kernel.org, akpm@...ux-foundation.org
Subject: [PATCH][v2] net/ipv4/arp.c: Fix arp reply when sender ip 0

Fix arp reply when received arp probe with sender ip 0.

Send arp reply with target ip address 0.0.0.0 and target hardware address
set to hardware address of requester. Previously sent reply with target
ip address and target hardware address set to same as source fields.


Signed-off-by: Jonas Danielsson <the.sator@...il.com>
Acked-by: Alexey Kuznetov <kuznet@....inr.ac.ru>
---
arp.c |    3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -828,7 +828,8 @@ static int arp_process(struct sk_buff *skb)
                if (arp->ar_op == htons(ARPOP_REQUEST) &&
                    inet_addr_type(tip) == RTN_LOCAL &&
                    !arp_ignore(in_dev,dev,sip,tip))
-
arp_send(ARPOP_REPLY,ETH_P_ARP,tip,dev,tip,sha,dev->dev_addr,dev->dev_addr);
+                       arp_send(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
+                                dev->dev_addr, sha);
                goto out;
        }
-
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