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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
..
9p Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-06-28 17:37:00 -07:00
802 tokenring: delete all remaining driver support 2012-05-15 20:23:16 -04:00
8021q Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-05-16 22:17:37 -04:00
appletalk appletalk: Remove out of date message in printk 2012-06-07 13:11:59 -07:00
atm net: Remove casts to same type 2012-06-04 11:45:11 -04:00
ax25 net: use consume_skb() in place of kfree_skb() 2012-06-04 11:27:40 -04:00
batman-adv batman-adv: Prefix main defines with BATADV_ 2012-06-28 08:45:05 +02:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-06-28 17:37:00 -07:00
bridge Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-06-28 17:37:00 -07:00
caif Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-06-28 17:37:00 -07:00
can canfd: add support for CAN FD in CAN_RAW sockets 2012-06-19 21:40:08 +02:00
ceph libceph: flush msgr queue during mon_client shutdown 2012-06-20 07:43:50 -05:00
core Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-06-28 17:37:00 -07:00
dcb net: dcb: fix small regression in __dcbnl_pg_setcfg() 2012-06-21 15:06:00 -07:00
dccp ipv4: tcp: dont cache output dst for syncookies 2012-06-22 21:47:33 -07:00
decnet netlink: Get rid of obsolete rtnetlink macros 2012-06-27 15:36:44 -07:00
dns_resolver Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2012-05-21 20:27:36 -07:00
dsa dsa: Convert compare_ether_addr to ether_addr_equal 2012-05-09 20:49:19 -04:00
ethernet net, drivers/net: Convert compare_ether_addr_64bits to ether_addr_equal_64bits 2012-05-10 23:33:01 -04:00
ieee802154 net: Use NLMSG_DEFAULT_SIZE in combination with nlmsg_new() 2012-06-28 17:56:43 -07:00
ipv4 ipv4: Remove extraneous assignment of dst->tclassid. 2012-06-28 22:17:39 -07:00
ipv6 ipv6_tunnel: Allow receiving packets on the fallback tunnel if they pass sanity checks 2012-06-29 00:52:32 -07:00
ipx ipx: Remove spurious NULL checking in ipx_ioctl(). 2012-05-19 00:51:04 -04:00
irda net: Remove casts to same type 2012-06-04 11:45:11 -04:00
iucv net: remove skb_orphan_try() 2012-06-15 15:30:15 -07:00
key net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
l2tp net: Use NLMSG_DEFAULT_SIZE in combination with nlmsg_new() 2012-06-28 17:56:43 -07:00
lapb lapb: Neaten debugging 2012-05-17 18:45:20 -04:00
llc net: include/net/sock.h cleanup 2012-05-17 04:50:21 -04:00
mac80211 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-06-28 17:37:00 -07:00
mac802154 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-06-28 17:37:00 -07:00
netfilter netfilter: nfnetlink_queue_core: Move away from NLMSG_PUT(). 2012-06-26 21:35:27 -07:00
netlabel netlabel: use GFP flags from caller instead of GFP_ATOMIC 2012-03-22 19:29:57 -04:00
netlink genetlink: Build a generic netlink family module alias 2012-05-29 22:33:56 -04:00
netrom net: Convert all sysctl registrations to register_net_sysctl 2012-04-20 21:22:30 -04:00
nfc net: Use NLMSG_DEFAULT_SIZE in combination with nlmsg_new() 2012-06-28 17:56:43 -07:00
openvswitch Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-05-16 22:17:37 -04:00
packet net: added support for 40GbE link. 2012-06-27 15:42:24 -07:00
phonet net: remove my future former mail address 2012-06-17 16:29:38 -07:00
rds rds_rdma: don't assume infiniband device is PCI 2012-05-29 17:30:07 -04:00
rfkill rfkill: Add the capability to switch all devices of all type in __rfkill_switch_all(). 2012-06-06 15:18:17 -04:00
rose net: Convert all sysctl registrations to register_net_sysctl 2012-04-20 21:22:30 -04:00
rxrpc ipv4: Kill ip_rt_frag_needed(). 2012-06-11 02:08:59 -07:00
sched pkt_sched: sch_api: Move away from NLMSG_NEW(). 2012-06-26 21:54:15 -07:00
sctp sctp: fix warning when compiling without IPv6 2012-06-19 00:26:26 -07:00
sunrpc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-06-28 17:37:00 -07:00
tipc net: Remove casts to same type 2012-06-04 11:45:11 -04:00
unix unix_diag: Do not use RTA_PUT() macros 2012-06-27 15:36:43 -07:00
wanrouter net/wanrouter: Deprecate and schedule for removal 2012-05-24 16:22:53 -04:00
wimax net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
wireless net: Use NLMSG_DEFAULT_SIZE in combination with nlmsg_new() 2012-06-28 17:56:43 -07:00
x25 net: add a limit parameter to sk_add_backlog() 2012-04-23 22:28:28 -04:00
xfrm xfrm_user: Propagate netlink error codes properly. 2012-06-27 21:57:03 -07:00
Kconfig net: drop NET dependency from HAVE_BPF_JIT 2012-05-21 12:50:12 -07:00
Makefile econet: remove ancient bug ridden protocol 2012-05-18 01:35:08 -04:00
compat.c Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2012-05-21 20:27:36 -07:00
nonet.c
…
socket.c Merge branch 'for-3.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2012-05-22 17:37:47 -07:00
sysctl_net.c net: delete all instances of special processing for token ring 2012-05-15 20:14:35 -04:00