netdev - [PATCH net-next 03/10] ovpn: set skb->ignore_df = 1 before sending IPv6 packets out

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Message-ID: <20250515111355.15327-4-antonio@openvpn.net>
Date: Thu, 15 May 2025 13:13:48 +0200
From: Antonio Quartulli <antonio@...nvpn.net>
To: netdev@...r.kernel.org
Cc: Antonio Quartulli <antonio@...nvpn.net>,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	sd@...asysnail.net,
	Gert Doering <gert@...enie.muc.de>
Subject: [PATCH net-next 03/10] ovpn: set skb->ignore_df = 1 before sending IPv6 packets out

IPv6 user packets (sent over the tunnel) may be larger than
the outgoing interface MTU after encapsulation.
When this happens ovpn should allow the kernel to fragment
them because they are "locally generated".

To achieve the above, we must set skb->ignore_df = 1
so that ip6_fragment() can be made aware of this decision.

Failing to do so will result in ip6_fragment() dropping
the packet thinking it was "routed".

No change is required in the IPv4 path, because when
calling udp_tunnel_xmit_skb() we already pass the
'df' argument set to 0, therefore the resulting datagram
is allowed to be fragmented if need be.

Fixes: 08857b5ec5d9 ("ovpn: implement basic TX path (UDP)")
Reported-by: Gert Doering <gert@...enie.muc.de>
Closes: https://github.com/OpenVPN/ovpn-net-next/issues/3
Tested-by: Gert Doering <gert@...enie.muc.de>
Acked-by: Gert Doering <gert@...enie.muc.de> # as primary user
Link: https://mail-archive.com/openvpn-devel@lists.sourceforge.net/msg31577.html
Signed-off-by: Antonio Quartulli <antonio@...nvpn.net>
---
 drivers/net/ovpn/udp.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/ovpn/udp.c b/drivers/net/ovpn/udp.c
index c9e189056f33..aef8c0406ec9 100644
--- a/drivers/net/ovpn/udp.c
+++ b/drivers/net/ovpn/udp.c
@@ -262,6 +262,16 @@ static int ovpn_udp6_output(struct ovpn_peer *peer, struct ovpn_bind *bind,
 	dst_cache_set_ip6(cache, dst, &fl.saddr);
 
 transmit:
+	/* user IPv6 packets may be larger than the transport interface
+	 * MTU (after encapsulation), however, since they are locally
+	 * generated we should ensure they get fragmented.
+	 * Setting the ignore_df flag to 1 will instruct ip6_fragment() to
+	 * fragment packets if needed.
+	 *
+	 * NOTE: this is not needed for IPv4 because we pass df=0 to
+	 * udp_tunnel_xmit_skb()
+	 */
+	skb->ignore_df = 1;
 	udp_tunnel6_xmit_skb(dst, sk, skb, skb->dev, &fl.saddr, &fl.daddr, 0,
 			     ip6_dst_hoplimit(dst), 0, fl.fl6_sport,
 			     fl.fl6_dport, udp_get_no_check6_tx(sk));
-- 
2.49.0