Hi,
On Wed, May 07, 2025 at 02:44:39PM +0200, Antonio Quartulli wrote:
> From: Antonio Quartulli <anto...@openvpn.net>
>
> ndo_start_xmit is basically expected to always return NETDEV_TX_OK.
> However, in case of error, it was currently returning NET_XMIT_DROP,
> which is not a valid netdev_tx_t return value, leading to
> misinterpretation.
>
> Change ndo_start_xmit to always return NETDEV_TX_OK to signal back
> to the caller that the packet was handled (even if dropped).
>
> Effects of this bug can be seen when sending IPv6 packets having
> no peer to forward them to:
>
> $ ip netns exec ovpn-server oping -c20 fd00:abcd:220:201::1
> PING fd00:abcd:220:201::1 (fd00:abcd:220:201::1) 56 bytes of
> data.00:abcd:220:201 :1
> ping_send failed: No buffer space available
> ping_sendto: No buffer space available
> ping_send failed: No buffer space available
> ping_sendto: No buffer space available
> ...
>
> Fixes: c2d950c4672a ("ovpn: add basic interface
> creation/destruction/management routines")
> Signed-off-by: Antonio Quartulli <anto...@openvpn.net>
> ---
> drivers/net/ovpn/io.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ovpn/io.c b/drivers/net/ovpn/io.c
> index dd8a8055d967..03728ce733a9 100644
> --- a/drivers/net/ovpn/io.c
> +++ b/drivers/net/ovpn/io.c
> @@ -408,7 +408,7 @@ netdev_tx_t ovpn_net_xmit(struct sk_buff *skb, struct
> net_device *dev)
> dev_dstats_tx_dropped(ovpn->dev);
> skb_tx_error(skb);
> kfree_skb_list(skb);
> - return NET_XMIT_DROP;
> + return NETDEV_TX_OK;
> }
Tested, works :-) - so the previous behaviour was "oping was hanging
due to 'out of buffer space' error not being counted as 'packet sent'"
and now it's behaving as any regular network interface when there
is no ARP/IPv6 ND for that neighbour. Explanation makes sense, too :-)
So
Acked-By: Gert Doering <g...@greenie.muc.de>
gert
--
"If was one thing all people took for granted, was conviction that if you
feed honest figures into a computer, honest figures come out. Never doubted
it myself till I met a computer with a sense of humor."
Robert A. Heinlein, The Moon is a Harsh Mistress
Gert Doering - Munich, Germany g...@greenie.muc.de
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