netdev - [PATCH v2 net-next] net: display hw address of source machine during ipv6 DAD failure

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Date:   Mon, 30 Oct 2017 19:38:52 -0400
From:   Vishwanath Pai <vpai@...mai.com>
To:     yoshfuji@...ux-ipv6.org, kuznet@....inr.ac.ru, davem@...emloft.net
Cc:     dsahern@...il.com, netdev@...r.kernel.org, ilubashe@...mai.com,
        pai.vishwain@...il.com
Subject: [PATCH v2 net-next] net: display hw address of source machine during ipv6 DAD failure

This patch updates the error messages displayed in kernel log to include
hwaddress of the source machine that caused ipv6 duplicate address
detection failures.

Examples:

a) When we receive a NA packet from another machine advertising our
address:

ICMPv6: NA: 34:ab:cd:56:11:e8 advertised our address 2001:db8:: on eth0!

b) When we detect DAD failure during address assignment to an interface:

IPv6: eth0: IPv6 duplicate address 2001:db8:: used by 34:ab:cd:56:11:e8
detected!

v2:
    Changed %pI6 to %pI6c in ndisc_recv_na()
    Chaged the v6 address in the commit message to 2001:db8::

Suggested-by: Igor Lubashev <ilubashe@...mai.com>
Signed-off-by: Vishwanath Pai <vpai@...mai.com>
---
 include/net/addrconf.h | 2 +-
 net/ipv6/addrconf.c    | 6 +++---
 net/ipv6/ndisc.c       | 9 +++++----
 3 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index 15b5ffd..2a616ea 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -208,7 +208,7 @@ bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 void ipv6_mc_init_dev(struct inet6_dev *idev);
 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
-void addrconf_dad_failure(struct inet6_ifaddr *ifp);
+void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
 
 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 			 const struct in6_addr *src_addr);
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 5a8a102..cfa374c 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1987,7 +1987,7 @@ static int addrconf_dad_end(struct inet6_ifaddr *ifp)
 	return err;
 }
 
-void addrconf_dad_failure(struct inet6_ifaddr *ifp)
+void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
 {
 	struct inet6_dev *idev = ifp->idev;
 	struct net *net = dev_net(ifp->idev->dev);
@@ -1997,8 +1997,8 @@ void addrconf_dad_failure(struct inet6_ifaddr *ifp)
 		return;
 	}
 
-	net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
-			     ifp->idev->dev->name, &ifp->addr);
+	net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
+			     ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
 
 	spin_lock_bh(&ifp->lock);
 
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 266a530..f9c3ffe 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -46,6 +46,7 @@
 #endif
 
 #include <linux/if_addr.h>
+#include <linux/if_ether.h>
 #include <linux/if_arp.h>
 #include <linux/ipv6.h>
 #include <linux/icmpv6.h>
@@ -822,7 +823,7 @@ static void ndisc_recv_ns(struct sk_buff *skb)
 				 * who is doing DAD
 				 * so fail our DAD process
 				 */
-				addrconf_dad_failure(ifp);
+				addrconf_dad_failure(skb, ifp);
 				return;
 			} else {
 				/*
@@ -975,7 +976,7 @@ static void ndisc_recv_na(struct sk_buff *skb)
 	if (ifp) {
 		if (skb->pkt_type != PACKET_LOOPBACK
 		    && (ifp->flags & IFA_F_TENTATIVE)) {
-				addrconf_dad_failure(ifp);
+				addrconf_dad_failure(skb, ifp);
 				return;
 		}
 		/* What should we make now? The advertisement
@@ -989,8 +990,8 @@ static void ndisc_recv_na(struct sk_buff *skb)
 		 */
 		if (skb->pkt_type != PACKET_LOOPBACK)
 			ND_PRINTK(1, warn,
-				  "NA: someone advertises our address %pI6 on %s!\n",
-				  &ifp->addr, ifp->idev->dev->name);
+				  "NA: %pM advertised our address %pI6c on %s!\n",
+				  eth_hdr(skb)->h_source, &ifp->addr, ifp->idev->dev->name);
 		in6_ifa_put(ifp);
 		return;
 	}
-- 
1.9.1