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| author | Vishwanath Pai <vpai@akamai.com> | 2017-10-30 19:38:52 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-11-01 20:53:49 +0900 |
| commit | da13c59b9936dfedcf9f2203bd29fbf83ad672bf (patch) | |
| tree | c7cd1ad6e06b95449196f3aa3b9f58ff87dcc550 /net/ipv6/ndisc.c | |
| parent | cdb583cfe7d79b784a74b97deb2997fccb5dcf9b (diff) | |
| download | linux-rpi3-da13c59b9936dfedcf9f2203bd29fbf83ad672bf.tar.gz linux-rpi3-da13c59b9936dfedcf9f2203bd29fbf83ad672bf.tar.bz2 linux-rpi3-da13c59b9936dfedcf9f2203bd29fbf83ad672bf.zip | |
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@akamai.com>
Signed-off-by: Vishwanath Pai <vpai@akamai.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ndisc.c')
| -rw-r--r-- | net/ipv6/ndisc.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c index 266a530414d7..f9c3ffe04382 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 @@ have_ifp: * 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; } |