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vlan: fix skb_under_panic and races when toggling HW VLAN offload

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Toggling hardware VLAN TX offload (NETIF_F_HW_VLAN_CTAG_TX or
NETIF_F_HW_VLAN_STAG_TX) on a lower device invokes vlan_transfer_features(),
which dynamically changed vlandev->hard_header_len.

This causes two issues:
1. Lockless TX paths (e.g. packet_snd in af_packet.c, ip6_finish_output2)
   read dev->hard_header_len without holding RTNL lock. Mutating
   hard_header_len dynamically under RTNL creates a data race where upper
   layers reserve insufficient headroom based on a stale hard_header_len,
   resulting in skb_under_panic when vlan_dev_hard_header() is called.
2. In addition, vlan_transfer_features() updated hard_header_len without
   updating header_ops, causing a mismatch between allocated headroom
   and header creation.

Always setting dev->hard_header_len = real_dev->hard_header_len and
dev->needed_headroom = real_dev->needed_headroom + VLAN_HLEN unconditionally
ensures:
- dev->hard_header_len remains 100% static and immutable at real_dev->hard_header_len,
  eliminating all dynamic runtime updates and data races on hard_header_len.
- Upper layers allocating skbs via LL_RESERVED_SPACE() will always reserve
  sufficient headroom for software VLAN tag insertion (real_dev->hard_header_len +
  real_dev->needed_headroom + VLAN_HLEN).
- vlandev inherits real_dev->needed_tailroom so underlying trailer/padding/ICV
  requirements are honored.
- AF_PACKET SOCK_RAW network header offsets remain correctly aligned at
  real_dev->hard_header_len.
- vlan_header_ops is used unconditionally.

Note to stable teams: Make sure to backport these commits:

e16e960d55 ("ipvlan: inherit needed_headroom and needed_tailroom from phy_dev")
cef51860be ("macvlan: inherit needed_headroom and needed_tailroom from lowerdev")

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Reported-by: Tangxin Xie <xietangxin@h-partners.com>
Closes: https://lore.kernel.org/netdev/99d678ae-c7b2-4b44-b534-b8320679deb3@h-partners.com/
Cc: <stable@vger.kernel.org> # 3.19: e16e960d55: ipvlan: inherit needed_headroom and needed_tailroom from phy_dev
Cc: <stable@vger.kernel.org> # 3.19: cef51860be: macvlan: inherit needed_headroom and needed_tailroom from lowerdev
Cc: <stable@vger.kernel.org> # 3.19
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260811085246.2267779-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet
2026-08-20 13:05:43 -07:00
committed by Jakub Kicinski
parent d302d7109f
commit 447cbe95eb
1 changed files with 7 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files
net/8021q/vlan_dev.c
+7 -32
View File
@@ -502,26 +502,6 @@ static const struct header_ops vlan_header_ops = {
.parse_protocol = vlan_parse_protocol,
};
static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
unsigned short type,
const void *daddr, const void *saddr,
unsigned int len)
{
struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
struct net_device *real_dev = vlan->real_dev;
if (saddr == NULL)
saddr = dev->dev_addr;
return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
}
static const struct header_ops vlan_passthru_header_ops = {
.create = vlan_passthru_hard_header,
.parse = eth_header_parse,
.parse_protocol = vlan_parse_protocol,
};
static const struct device_type vlan_type = {
.name = "vlan",
};
@@ -580,14 +560,10 @@ static int vlan_dev_init(struct net_device *dev)
dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
#endif
dev->needed_headroom = real_dev->needed_headroom;
if (vlan_hw_offload_capable(real_dev->features, vlan->vlan_proto)) {
dev->header_ops = &vlan_passthru_header_ops;
dev->hard_header_len = real_dev->hard_header_len;
} else {
dev->header_ops = &vlan_header_ops;
dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
}
dev->needed_headroom = real_dev->needed_headroom + VLAN_HLEN;
dev->needed_tailroom = real_dev->needed_tailroom;
dev->header_ops = &vlan_header_ops;
dev->hard_header_len = real_dev->hard_header_len;
dev->netdev_ops = &vlan_netdev_ops;
@@ -1029,10 +1005,9 @@ static void vlan_transfer_features(struct net_device *dev,
netif_inherit_tso_max(vlandev, dev);
if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto))
vlandev->hard_header_len = dev->hard_header_len;
else
vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
vlandev->needed_headroom = dev->needed_headroom + VLAN_HLEN;
vlandev->needed_tailroom = dev->needed_tailroom;
vlandev->hard_header_len = dev->hard_header_len;
#if IS_ENABLED(CONFIG_FCOE)
vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;