[PATCH 6.1 284/303] ipvlan: inherit needed_headroom and needed_tailroom from phy_dev

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

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

From: Eric Dumazet <[email protected]>

[ Upstream commit e16e960d55a40d36bd7c2494cc005e757dc9a1ef ]

ipvlan devices inherit hard_header_len from phy_dev during ipvlan_init(),
but leave needed_headroom and needed_tailroom set to 0.

When the underlying phy_dev (or stacked lower device) requires extra headroom
or tailroom for headers/trailers (e.g. macsec, ipsec, wireguard, tunnels, or
veth with rx headroom), upper layers calculating packet headroom and tailroom
fail to reserve sufficient space.

This can result in reallocation overhead, skb headroom underflows, or KASAN
slab-use-after-free crashes when dev_hard_header() / ipvlan_hard_header()
prepends header data or when lower devices append tailroom.

Fix this by:
1. Inheriting needed_headroom and needed_tailroom from phy_dev in ipvlan_init().
2. Propagating needed_headroom and needed_tailroom updates to attached ipvlans
   in ipvlan_device_event() when receiving NETDEV_FEAT_CHANGE events.

Fixes: 2ad7bf363841 ("ipvlan: Initial check-in of the IPVLAN driver.")
Reported-by: [email protected]
Closes: https://lore.kernel.org/netdev/[email protected]/T/#u
Reported-by: Tangxin Xie <[email protected]>
Closes: https://lore.kernel.org/netdev/CANn89i+1EW-sFNK8xoq98gMbPCeLS7e=+rs9gHfLg5Wj+4x0sw@mail.gmail.com/T/#mcc6307f115e500df23ea2980d5669fe95f20b6b4
Signed-off-by: Eric Dumazet <[email protected]>
Reviewed-by: Hangbin Liu <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
---
 drivers/net/ipvlan/ipvlan_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ipvlan/ipvlan_main.c b/drivers/net/ipvlan/ipvlan_main.c
index a9aeaa9b5779d..9fe2ddec735ea 100644
--- a/drivers/net/ipvlan/ipvlan_main.c
+++ b/drivers/net/ipvlan/ipvlan_main.c
@@ -144,6 +144,8 @@ static int ipvlan_init(struct net_device *dev)
 	dev->hw_enc_features |= dev->features;
 	netif_inherit_tso_max(dev, phy_dev);
 	dev->hard_header_len = phy_dev->hard_header_len;
+	dev->needed_headroom = phy_dev->needed_headroom;
+	dev->needed_tailroom = phy_dev->needed_tailroom;
 
 	netdev_lockdep_set_classes(dev);
 
@@ -767,6 +769,8 @@ static int ipvlan_device_event(struct notifier_block *unused,
 	case NETDEV_FEAT_CHANGE:
 		list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
 			netif_inherit_tso_max(ipvlan->dev, dev);
+			ipvlan->dev->needed_headroom = dev->needed_headroom;
+			ipvlan->dev->needed_tailroom = dev->needed_tailroom;
 			netdev_update_features(ipvlan->dev);
 		}
 		break;
-- 
2.53.0