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 3.12-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-3.12 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 09:44:41 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 ++++++++++++++++++-
net/core/neighbour.c | 2 +-
3 files changed, 28 insertions(+), 2 deletions(-)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1872,6 +1872,15 @@ 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
@@ -549,6 +549,23 @@ 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 struct device_type vlan_type = {
.name = "vlan",
};
@@ -592,7 +609,7 @@ static int vlan_dev_init(struct net_devi
dev->needed_headroom = real_dev->needed_headroom;
if (real_dev->features & NETIF_F_HW_VLAN_CTAG_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;
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -1274,7 +1274,7 @@ int neigh_compat_output(struct neighbour
if (dev_hard_header(skb, dev, ntohs(skb->protocol), NULL, NULL,
skb->len) < 0 &&
- dev->header_ops->rebuild(skb))
+ dev_rebuild_header(skb))
return 0;
return dev_queue_xmit(skb);
Patches currently in stable-queue which might be from davem@xxxxxxxxxxxxx are
queue-3.12/ipv6-don-t-count-addrconf-generated-routes-against-gc-limit.patch
queue-3.12/drivers-net-hamradio-integer-overflow-in-hdlcdrv_ioctl.patch
queue-3.12/macvtap-update-file-current-position.patch
queue-3.12/sfc-refactor-efx_mcdi_poll-by-introducing-efx_mcdi_poll_once.patch
queue-3.12/sfc-poll-for-mcdi-completion-once-before-timeout-occurs.patch
queue-3.12/ipv4-fix-tunneled-vm-traffic-over-hw-vxlan-gre-gso-nic.patch
queue-3.12/net-unix-allow-set_peek_off-to-fail.patch
queue-3.12/vlan-fix-header-ops-passthru-when-doing-tx-vlan-offload.patch
queue-3.12/sfc-stop-re-start-ptp-when-stopping-starting-the-datapath.patch
queue-3.12/ipv6-always-set-the-new-created-dst-s-from-in-ip6_rt_copy.patch
queue-3.12/netvsc-don-t-flush-peers-notifying-work-during-setting-mtu.patch
queue-3.12/net-clear-local_df-when-passing-skb-between-namespaces.patch
queue-3.12/net-do-not-pretend-fraglist-support.patch
queue-3.12/sfc-rx-buffer-allocation-takes-prefix-size-into-account-in-ip-header-alignment.patch
queue-3.12/macvtap-signal-truncated-packets.patch
queue-3.12/net-rose-restore-old-recvmsg-behavior.patch
queue-3.12/sfc-add-length-checks-to-efx_xmit_with_hwtstamp-and-efx_ptp_is_ptp_tx.patch
queue-3.12/arc_emac-fix-potential-use-after-free.patch
queue-3.12/net-inet_diag-zero-out-uninitialized-idiag_-src-dst-fields.patch
queue-3.12/sfc-ptp-moderate-log-message-on-event-queue-overflow.patch
queue-3.12/virtio_net-fix-error-handling-for-mergeable-buffers.patch
queue-3.12/vxlan-release-rt-when-found-circular-route.patch
queue-3.12/sfc-rate-limit-log-message-for-ptp-packets-without-a-matching-timestamp-event.patch
queue-3.12/packet-fix-send-path-when-running-with-proto-0.patch
queue-3.12/tg3-initialize-reg_base_addr-at-pci-config-offset-120-to-0.patch
queue-3.12/net-drop_monitor-fix-the-value-of-maxattr.patch
queue-3.12/tun-unbreak-truncated-packet-signalling.patch
queue-3.12/virtio-net-make-all-rx-paths-handle-errors.patch
queue-3.12/net-unix-allow-bind-to-fail-on-mutex-lock.patch
queue-3.12/macvtap-do-not-double-count-received-packets.patch
queue-3.12/hamradio-yam-fix-info-leak-in-ioctl.patch
queue-3.12/br-fix-use-of-rx_handler_data-in-code-executed-on-non-rx_handler-path.patch
queue-3.12/netpoll-fix-missing-txq-unlock-and-and-oops.patch
queue-3.12/inet-fix-null-pointer-oops-in-fib-6-_rule_suppress.patch
queue-3.12/tun-update-file-current-position.patch
queue-3.12/ipv6-fix-illegal-mac_header-comparison-on-32bit.patch
queue-3.12/ip_gre-fix-msg_name-parsing-for-recvfrom-recvmsg.patch
queue-3.12/bridge-use-spin_lock_bh-in-br_multicast_set_hash_max.patch
queue-3.12/virtio-net-fix-refill-races-during-restore.patch
queue-3.12/virtio_net-don-t-leak-memory-or-block-when-too-many-frags.patch
queue-3.12/virtio-delete-napi-structures-from-netdev-before-releasing-memory.patch
queue-3.12/net-llc-fix-use-after-free-in-llc_ui_recvmsg.patch
queue-3.12/sfc-maintain-current-frequency-adjustment-when-applying-a-time-offset.patch
queue-3.12/net-fec-fix-potential-use-after-free.patch
queue-3.12/rds-prevent-dereference-of-a-null-device.patch
queue-3.12/rds-prevent-bug_on-triggered-on-congestion-update-to-loopback.patch
queue-3.12/ipv6-fixed-support-for-blackhole-and-prohibit-routes.patch
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