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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
..
netfilter netfilter: add user-space connection tracking helper infrastructure 2012-06-16 15:40:02 +02:00
Kconfig xfrm: make xfrm_algo.c a module 2012-05-15 13:13:34 -04:00
Makefile
…
addrconf.c Merge branch 'delete-tokenring' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2012-05-16 01:02:40 -04:00
addrconf_core.c net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
addrlabel.c ipv6: bool/const conversions phase2 2012-05-19 01:08:16 -04:00
af_inet6.c ipv6: bool conversions phase1 2012-05-18 02:24:13 -04:00
ah6.c ipv6: Handle PMTU in ICMP error handlers. 2012-06-15 14:54:11 -07:00
anycast.c ipv6: bool/const conversions phase2 2012-05-19 01:08:16 -04:00
datagram.c ipv6: bool/const conversions phase2 2012-05-19 01:08:16 -04:00
esp6.c ipv6: Handle PMTU in ICMP error handlers. 2012-06-15 14:54:11 -07:00
exthdrs.c net: Remove casts to same type 2012-06-04 11:45:11 -04:00
exthdrs_core.c ipv6: bool/const conversions phase2 2012-05-19 01:08:16 -04:00
fib6_rules.c net/ipv6/fib6_rules.c: Checkpatch cleanup 2012-04-02 04:33:46 -04:00
icmp.c inet: Sanitize inet{,6} protocol demux. 2012-06-19 18:56:21 -07:00
inet6_connection_sock.c tcp: pass fl6 to inet6_csk_route_req() 2012-06-28 17:53:50 -07:00
inet6_hashtables.c net: Compute protocol sequence numbers and fragment IDs using MD5. 2011-08-06 18:33:19 -07:00
ip6_fib.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-06-25 15:50:32 -07:00
ip6_flowlabel.c ipv6: bool/const conversions phase2 2012-05-19 01:08:16 -04:00
ip6_input.c inet: Sanitize inet{,6} protocol demux. 2012-06-19 18:56:21 -07:00
ip6_output.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-06-12 21:59:18 -07:00
ip6_tunnel.c ipv6_tunnel: Allow receiving packets on the fallback tunnel if they pass sanity checks 2012-06-29 00:52:32 -07:00
ip6mr.c ip6mr: Do not use RTA_PUT() macros 2012-06-27 15:36:44 -07:00
ipcomp6.c ipv6: Handle PMTU in ICMP error handlers. 2012-06-15 14:54:11 -07:00
ipv6_sockglue.c net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
mcast.c ipv6: bool/const conversions phase2 2012-05-19 01:08:16 -04:00
mip6.c ipv6: correct the ipv6 option name - Pad0 to Pad1 2012-05-17 15:49:51 -04:00
ndisc.c inet: Create and use rt{,6}_get_peer_create(). 2012-06-08 23:24:18 -07:00
netfilter.c Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2011-11-06 19:44:47 -08:00
proc.c ipv6: fix per device IP snmp counters 2012-01-17 23:56:18 -05:00
protocol.c inet: Sanitize inet{,6} protocol demux. 2012-06-19 18:56:21 -07:00
raw.c inet: Sanitize inet{,6} protocol demux. 2012-06-19 18:56:21 -07:00
reassembly.c ipv6: use skb coalescing in reassembly 2012-05-19 18:34:57 -04:00
route.c net/ipv6/route.c: packets originating on device match lo 2012-06-25 23:54:32 -07:00
sit.c ipv4: Handle PMTU in all ICMP error handlers. 2012-06-14 22:22:07 -07:00
syncookies.c net: remove ipv6_addr_copy() 2011-11-22 16:43:32 -05:00
sysctl_net_ipv6.c net: Delete all remaining instances of ctl_path 2012-04-20 21:22:30 -04:00
tcp_ipv6.c tcp: plug dst leak in tcp_v6_conn_request() 2012-06-28 17:54:03 -07:00
tunnel6.c net: ipv6: Standardize prefixes for message logging 2012-05-16 01:01:03 -04:00
udp.c net: skb_free_datagram_locked() doesnt drop all packets 2012-06-27 15:40:57 -07:00
udp_impl.h net: Make setsockopt() optlen be unsigned. 2009-09-30 16:12:20 -07:00
udplite.c Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2011-11-06 19:44:47 -08:00
xfrm6_input.c netfilter: ipv6: use NFPROTO values for NF_HOOK invocation 2010-03-25 16:00:49 +01:00
xfrm6_mode_beet.c ipsec: be careful of non existing mac headers 2012-02-23 16:50:45 -05:00
xfrm6_mode_ro.c
…
xfrm6_mode_transport.c
…
xfrm6_mode_tunnel.c ipsec: be careful of non existing mac headers 2012-02-23 16:50:45 -05:00
xfrm6_output.c xfrm6: remove unneeded NULL check in __xfrm6_output() 2012-02-01 02:52:48 -05:00
xfrm6_policy.c inet: Hide route peer accesses behind helpers. 2012-06-11 02:08:47 -07:00
xfrm6_state.c net: remove ipv6_addr_copy() 2011-11-22 16:43:32 -05:00
xfrm6_tunnel.c net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00