[linux-next] LinuxNextTracking branch, master, updated. next-20180305

batman at open-mesh.org batman at open-mesh.org
Tue Mar 6 00:16:38 CET 2018

The following commit has been merged in the master branch:
commit abd6360591d3f8259f41c34e31ac4826dfe621b8
Author: Matthias Schiffer <mschiffer at universe-factory.net>
Date:   Tue Jan 23 10:59:49 2018 +0100

    batman-adv: fix packet checksum in receive path
    eth_type_trans() internally calls skb_pull(), which does not adjust the
    skb checksum; skb_postpull_rcsum() is necessary to avoid log spam of the
    form "bat0: hw csum failure" when packets with CHECKSUM_COMPLETE are
    Note that in usual setups, packets don't reach batman-adv with
    CHECKSUM_COMPLETE (I assume NICs bail out of checksumming when they see
    batadv's ethtype?), which is why the log messages do not occur on every
    system using batman-adv. I could reproduce this issue by stacking
    batman-adv on top of a VXLAN interface.
    Fixes: c6c8fea29769 ("net: Add batman-adv meshing protocol")
    Tested-by: Maximilian Wilhelm <max at sdn.clinic>
    Signed-off-by: Matthias Schiffer <mschiffer at universe-factory.net>
    Signed-off-by: Sven Eckelmann <sven at narfation.org>
    Signed-off-by: Simon Wunderlich <sw at simonwunderlich.de>

diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 900c5ce21cd4..367a81fb785f 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -459,13 +459,7 @@ void batadv_interface_rx(struct net_device *soft_iface,
 	/* skb->dev & skb->pkt_type are set here */
 	skb->protocol = eth_type_trans(skb, soft_iface);
-	/* should not be necessary anymore as we use skb_pull_rcsum()
-	 * TODO: please verify this and remove this TODO
-	 * -- Dec 21st 2009, Simon Wunderlich
-	 */
-	/* skb->ip_summed = CHECKSUM_UNNECESSARY; */
+	skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 	batadv_inc_counter(bat_priv, BATADV_CNT_RX);
 	batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,


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