linux/include
Ville Nuorvala d0087b29f7 ipv6_tunnel: Allow receiving packets on the fallback tunnel if they pass sanity checks
At Facebook, we do Layer-3 DSR via IP-in-IP tunneling. Our load balancers wrap
an extra IP header on incoming packets so they can be routed to the backend.
In the v4 tunnel driver, when these packets fall on the default tunl0 device,
the behavior is to decapsulate them and drop them back on the stack. So our
setup is that tunl0 has the VIP and eth0 has (obviously) the backend's real
address.

In IPv6 we do the same thing, but the v6 tunnel driver didn't have this same
behavior - if you didn't have an explicit tunnel setup, it would drop the
packet.

This patch brings that v4 feature to the v6 driver.

The same IPv6 address checks are performed as with any normal tunnel,
but as the fallback tunnel endpoint addresses are unspecified, the checks
must be performed on a per-packet basis, rather than at tunnel
configuration time.

[Patch description modified by phil@ipom.com]

Signed-off-by: Ville Nuorvala <ville.nuorvala@gmail.com>
Tested-by: Phil Dibowitz <phil@ipom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-06-29 00:52:32 -07:00
..
acpi ACPI: fix acpi_bus.h build warnings when ACPI is not enabled 2012-06-04 00:29:11 -04:00
asm-generic bug.h: Fix up CONFIG_BUG=n implicit function declarations. 2012-06-25 10:32:49 -07:00
crypto
drm drm: drop comment about this header being autogenerated. 2012-06-22 11:04:55 +01:00
keys
linux Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-06-28 17:37:00 -07:00
math-emu
media
memory
misc
mtd
net ipv6_tunnel: Allow receiving packets on the fallback tunnel if they pass sanity checks 2012-06-29 00:52:32 -07:00
pcmcia
rdma
rxrpc
scsi SCSI & usb-storage: add try_rc_10_first flag 2012-06-22 22:05:31 -07:00
sound Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2012-06-25 14:53:09 -07:00
target target: Add TFO->put_session() caller for HW fabric session shutdown 2012-06-12 19:33:05 -07:00
trace rcu: Update RCU_FAST_NO_HZ tracing for lazy callbacks 2012-06-06 20:43:27 -07:00
video fbdev updates for 3.5 2012-06-01 16:57:51 -07:00
xen
Kbuild