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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, Vasily Khoruzhick <vasilykh@arista.com>,
	"David S. Miller" <davem@davemloft.net>
Subject: [PATCH 4.4 15/28] neighbour: confirm neigh entries when ARP packet is received
Date: Thu, 27 Sep 2018 11:06:39 +0200	[thread overview]
Message-ID: <20180927090638.323505611@linuxfoundation.org> (raw)
In-Reply-To: <20180927090637.687829444@linuxfoundation.org>

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vasily Khoruzhick <vasilykh@arista.com>

[ Upstream commit f0e0d04413fcce9bc76388839099aee93cd0d33b ]

Update 'confirmed' timestamp when ARP packet is received. It shouldn't
affect locktime logic and anyway entry can be confirmed by any higher-layer
protocol. Thus it makes sense to confirm it when ARP packet is received.

Fixes: 77d7123342dc ("neighbour: update neigh timestamps iff update is effective")
Signed-off-by: Vasily Khoruzhick <vasilykh@arista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/core/neighbour.c |   13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -1140,6 +1140,12 @@ int neigh_update(struct neighbour *neigh
 		lladdr = neigh->ha;
 	}
 
+	/* Update confirmed timestamp for neighbour entry after we
+	 * received ARP packet even if it doesn't change IP to MAC binding.
+	 */
+	if (new & NUD_CONNECTED)
+		neigh->confirmed = jiffies;
+
 	/* If entry was valid and address is not changed,
 	   do not change entry state, if new one is STALE.
 	 */
@@ -1163,15 +1169,12 @@ int neigh_update(struct neighbour *neigh
 		}
 	}
 
-	/* Update timestamps only once we know we will make a change to the
+	/* Update timestamp only once we know we will make a change to the
 	 * neighbour entry. Otherwise we risk to move the locktime window with
 	 * noop updates and ignore relevant ARP updates.
 	 */
-	if (new != old || lladdr != neigh->ha) {
-		if (new & NUD_CONNECTED)
-			neigh->confirmed = jiffies;
+	if (new != old || lladdr != neigh->ha)
 		neigh->updated = jiffies;
-	}
 
 	if (new != old) {
 		neigh_del_timer(neigh);



  parent reply	other threads:[~2018-09-27  9:33 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-27  9:06 [PATCH 4.4 00/28] 4.4.159-stable review Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 01/28] NFC: Fix possible memory corruption when handling SHDLC I-Frame commands Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 02/28] NFC: Fix the number of pipes Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 03/28] ASoC: cs4265: fix MMTLR Data switch control Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 04/28] ALSA: bebob: use address returned by kmalloc() instead of kernel stack for streaming DMA mapping Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 05/28] ALSA: emu10k1: fix possible info leak to userspace on SNDRV_EMU10K1_IOCTL_INFO Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 06/28] platform/x86: alienware-wmi: Correct a memory leak Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 07/28] xen/netfront: dont bug in case of too many frags Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 08/28] xen/x86/vpmu: Zero struct pt_regs before calling into sample handling code Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 09/28] ring-buffer: Allow for rescheduling when removing pages Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 10/28] mm: shmem.c: Correctly annotate new inodes for lockdep Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 11/28] gso_segment: Reset skb->mac_len after modifying network header Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 12/28] ipv6: fix possible use-after-free in ip6_xmit() Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 13/28] net/appletalk: fix minor pointer leak to userspace in SIOCFINDIPDDPRT Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 14/28] net: hp100: fix always-true check for link up state Greg Kroah-Hartman
2018-09-27  9:06 ` Greg Kroah-Hartman [this message]
2018-09-27  9:06 ` [PATCH 4.4 16/28] scsi: target: iscsi: Use hex2bin instead of a re-implementation Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 17/28] ocfs2: fix ocfs2 read block panic Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 18/28] drm/nouveau/drm/nouveau: Use pm_runtime_get_noresume() in connector_detect() Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 19/28] tty: vt_ioctl: fix potential Spectre v1 Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 20/28] ext4: avoid divide by zero fault when deleting corrupted inline directories Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 21/28] ext4: recalucate superblock checksum after updating free blocks/inodes Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 22/28] ext4: fix online resizes handling of a too-small final block group Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 23/28] ext4: fix online resizing for bigalloc file systems with a 1k block size Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 24/28] ext4: dont mark mmp buffer head dirty Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 25/28] arm64: Add trace_hardirqs_off annotation in ret_to_user Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 26/28] HID: sony: Update device ids Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 27/28] HID: sony: Support DS4 dongle Greg Kroah-Hartman
2018-09-27  9:06 ` [PATCH 4.4 28/28] iw_cxgb4: only allow 1 flush on user qps Greg Kroah-Hartman
2018-09-27 18:58 ` [PATCH 4.4 00/28] 4.4.159-stable review Nathan Chancellor
2018-09-27 19:47 ` Rafael David Tinoco
2018-09-27 20:19 ` Shuah Khan
2018-09-27 23:05 ` Guenter Roeck

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