[PATCH v2 net] ipvlan: inherit needed_headroom and needed_tailroom from phy_dev

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: 2ad7bfab3016 ("ipvlan: Initial check-in of the IPVLAN driver.")
Reported-by: syzbot+1f9fd0f4b601cf88d6e6@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/netdev/6a720a21.40259c87.584f4.04bb.GAE@google.com/T/#u (local)
Reported-by: Tangxin Xie <redacted>
Closes: https://lore.kernel.org/netdev/CANn89i+1EW-sFNK8xoq98gMbPCeLS7e=+rs9gHfLg5Wj+4x0sw@mail.gmail.com/T/#mcc6307f115e500df23ea2980d5669fe95f20b6b4 (local)
Signed-off-by: Eric Dumazet <edumazet@google.com>
---
v2: also inherit needed_tailroom (Sashiko)
v1: https://lore.kernel.org/netdev/CANn89iLr4EQxBAKikZCeXbXEk-pjmT4mq3d=D2P01MtNSUgwrg@mail.gmail.com/T/#t (local)

 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 ed46439a9f4eb1dd8bfaf6c83476ba4f2aff31bc..92d3d340281ffbc8e54a61e975484ab156c42c9b 100644
--- a/drivers/net/ipvlan/ipvlan_main.c
+++ b/drivers/net/ipvlan/ipvlan_main.c

@@ -146,6 +146,8 @@ static int ipvlan_init(struct net_device *dev)
 	dev->lltx = true;
 	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);
 

@@ -773,6 +775,8 @@ 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;

-- 
2.55.0.629.g250fe7f194-goog