This is a note to let you know that I've just added the patch titled
vlan: Fix header ops passthru when doing TX VLAN offload.
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
vlan-fix-header-ops-passthru-when-doing-tx-vlan-offload.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Mon Jan 13 09:28:30 PST 2014
From: "David S. Miller" <davem@xxxxxxxxxxxxx>
Date: Tue, 31 Dec 2013 16:23:35 -0500
Subject: vlan: Fix header ops passthru when doing TX VLAN offload.
From: "David S. Miller" <davem@xxxxxxxxxxxxx>
[ Upstream commit 2205369a314e12fcec4781cc73ac9c08fc2b47de ]
When the vlan code detects that the real device can do TX VLAN offloads
in hardware, it tries to arrange for the real device's header_ops to
be invoked directly.
But it does so illegally, by simply hooking the real device's
header_ops up to the VLAN device.
This doesn't work because we will end up invoking a set of header_ops
routines which expect a device type which matches the real device, but
will see a VLAN device instead.
Fix this by providing a pass-thru set of header_ops which will arrange
to pass the proper real device instead.
To facilitate this add a dev_rebuild_header(). There are
implementations which provide a ->cache and ->create but not a
->rebuild (f.e. PLIP). So we need a helper function just like
dev_hard_header() to avoid crashes.
Use this helper in the one existing place where the
header_ops->rebuild was being invoked, the neighbour code.
With lots of help from Florian Westphal.
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/linux/netdevice.h | 9 +++++++++
net/8021q/vlan_dev.c | 19 ++++++++++++++++++-
2 files changed, 27 insertions(+), 1 deletion(-)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1702,6 +1702,15 @@ static inline int dev_parse_header(const
return dev->header_ops->parse(skb, haddr);
}
+static inline int dev_rebuild_header(struct sk_buff *skb)
+{
+ const struct net_device *dev = skb->dev;
+
+ if (!dev->header_ops || !dev->header_ops->rebuild)
+ return 0;
+ return dev->header_ops->rebuild(skb);
+}
+
typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf);
static inline int unregister_gifconf(unsigned int family)
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -525,6 +525,23 @@ static const struct header_ops vlan_head
.parse = eth_header_parse,
};
+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;
+
+ 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,
+ .rebuild = dev_rebuild_header,
+ .parse = eth_header_parse,
+};
+
static const struct net_device_ops vlan_netdev_ops;
static int vlan_dev_init(struct net_device *dev)
@@ -564,7 +581,7 @@ static int vlan_dev_init(struct net_devi
dev->needed_headroom = real_dev->needed_headroom;
if (real_dev->features & NETIF_F_HW_VLAN_TX) {
- dev->header_ops = real_dev->header_ops;
+ dev->header_ops = &vlan_passthru_header_ops;
dev->hard_header_len = real_dev->hard_header_len;
} else {
dev->header_ops = &vlan_header_ops;
Patches currently in stable-queue which might be from davem@xxxxxxxxxxxxx are
queue-3.4/ipv6-don-t-count-addrconf-generated-routes-against-gc-limit.patch
queue-3.4/drivers-net-hamradio-integer-overflow-in-hdlcdrv_ioctl.patch
queue-3.4/macvtap-update-file-current-position.patch
queue-3.4/net-unix-allow-set_peek_off-to-fail.patch
queue-3.4/vlan-fix-header-ops-passthru-when-doing-tx-vlan-offload.patch
queue-3.4/netvsc-don-t-flush-peers-notifying-work-during-setting-mtu.patch
queue-3.4/net-do-not-pretend-fraglist-support.patch
queue-3.4/macvtap-signal-truncated-packets.patch
queue-3.4/net-rose-restore-old-recvmsg-behavior.patch
queue-3.4/net-inet_diag-zero-out-uninitialized-idiag_-src-dst-fields.patch
queue-3.4/tg3-initialize-reg_base_addr-at-pci-config-offset-120-to-0.patch
queue-3.4/net-drop_monitor-fix-the-value-of-maxattr.patch
queue-3.4/net-unix-allow-bind-to-fail-on-mutex-lock.patch
queue-3.4/macvtap-do-not-double-count-received-packets.patch
queue-3.4/hamradio-yam-fix-info-leak-in-ioctl.patch
queue-3.4/tun-update-file-current-position.patch
queue-3.4/bridge-use-spin_lock_bh-in-br_multicast_set_hash_max.patch
queue-3.4/net-llc-fix-use-after-free-in-llc_ui_recvmsg.patch
queue-3.4/rds-prevent-dereference-of-a-null-device.patch
queue-3.4/rds-prevent-bug_on-triggered-on-congestion-update-to-loopback.patch
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