netdev - [PATCH net] tunnels: Accept PACKET_HOST in skb_tunnel_check

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Message-ID: <eac941652b86fddf8909df9b3bf0d97bc9444793.1743208264.git.gnault@redhat.com>
Date: Sat, 29 Mar 2025 01:33:44 +0100
From: Guillaume Nault <gnault@...hat.com>
To: David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>
Cc: netdev@...r.kernel.org, Simon Horman <horms@...nel.org>,
	David Ahern <dsahern@...nel.org>, Pravin B Shelar <pshelar@....org>,
	Aaron Conole <aconole@...hat.com>,
	Eelco Chaudron <echaudro@...hat.com>,
	Stefano Brivio <sbrivio@...hat.com>, dev@...nvswitch.org
Subject: [PATCH net] tunnels: Accept PACKET_HOST in skb_tunnel_check_pmtu().

Because skb_tunnel_check_pmtu() doesn't handle PACKET_HOST packets,
commit 30a92c9e3d6b ("openvswitch: Set the skbuff pkt_type for proper
pmtud support.") forced skb->pkt_type to PACKET_OUTGOING for
openvswitch packets that are sent using the OVS_ACTION_ATTR_OUTPUT
action. This allowed such packets to invoke the
iptunnel_pmtud_check_icmp() or iptunnel_pmtud_check_icmpv6() helpers
and thus trigger PMTU update on the input device.

However, this also broke other parts of PMTU discovery. Since these
packets don't have the PACKET_HOST type anymore, they won't trigger the
sending of ICMP Fragmentation Needed or Packet Too Big messages to
remote hosts when oversized (see the skb_in->pkt_type condition in
__icmp_send() for example).

These two skb->pkt_type checks are therefore incompatible as one
requires skb->pkt_type to be PACKET_HOST, while the other requires it
to be anything but PACKET_HOST.

It makes sense to not trigger ICMP messages for non-PACKET_HOST packets
as these messages should be generated only for incoming l2-unicast
packets. However there doesn't seem to be any reason for
skb_tunnel_check_pmtu() to ignore PACKET_HOST packets.

Allow both cases to work by allowing skb_tunnel_check_pmtu() to work on
PACKET_HOST packets and not overriding skb->pkt_type in openvswitch
anymore.

Fixes: 30a92c9e3d6b ("openvswitch: Set the skbuff pkt_type for proper pmtud support.")
Fixes: 4cb47a8644cc ("tunnels: PMTU discovery support for directly bridged IP packets")
Signed-off-by: Guillaume Nault <gnault@...hat.com>
---
 net/ipv4/ip_tunnel_core.c | 2 +-
 net/openvswitch/actions.c | 6 ------
 2 files changed, 1 insertion(+), 7 deletions(-)

diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
index a3676155be78..364ea798511e 100644
--- a/net/ipv4/ip_tunnel_core.c
+++ b/net/ipv4/ip_tunnel_core.c
@@ -416,7 +416,7 @@ int skb_tunnel_check_pmtu(struct sk_buff *skb, struct dst_entry *encap_dst,

 	skb_dst_update_pmtu_no_confirm(skb, mtu);

-	if (!reply || skb->pkt_type == PACKET_HOST)
+	if (!reply)
 		return 0;

 	if (skb->protocol == htons(ETH_P_IP))
diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index 704c858cf209..61fea7baae5d 100644
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -947,12 +947,6 @@ static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port,
 				pskb_trim(skb, ovs_mac_header_len(key));
 		}

-		/* Need to set the pkt_type to involve the routing layer.  The
-		 * packet movement through the OVS datapath doesn't generally
-		 * use routing, but this is needed for tunnel cases.
-		 */
-		skb->pkt_type = PACKET_OUTGOING;
-
 		if (likely(!mru ||
 		           (skb->len <= mru + vport->dev->hard_header_len))) {
 			ovs_vport_send(vport, skb, ovs_key_mac_proto(key));
-- 
2.39.2