linux-toradex.git/net/ipv4/ipip.c, branch v3.8.3

net: Allow userns root to control ipv4

2012-11-19T01:32:45+00:00

Allow an unpriviled user who has created a user namespace, and then
created a network namespace to effectively use the new network
namespace, by reducing capable(CAP_NET_ADMIN) and
capable(CAP_NET_RAW) calls to be ns_capable(net->user_ns,
CAP_NET_ADMIN), or capable(net->user_ns, CAP_NET_RAW) calls.

Settings that merely control a single network device are allowed.
Either the network device is a logical network device where
restrictions make no difference or the network device is hardware NIC
that has been explicity moved from the initial network namespace.

In general policy and network stack state changes are allowed
while resource control is left unchanged.

Allow creating raw sockets.
Allow the SIOCSARP ioctl to control the arp cache.
Allow the SIOCSIFFLAG ioctl to allow setting network device flags.
Allow the SIOCSIFADDR ioctl to allow setting a netdevice ipv4 address.
Allow the SIOCSIFBRDADDR ioctl to allow setting a netdevice ipv4 broadcast address.
Allow the SIOCSIFDSTADDR ioctl to allow setting a netdevice ipv4 destination address.
Allow the SIOCSIFNETMASK ioctl to allow setting a netdevice ipv4 netmask.
Allow the SIOCADDRT and SIOCDELRT ioctls to allow adding and deleting ipv4 routes.

Allow the SIOCADDTUNNEL, SIOCCHGTUNNEL and SIOCDELTUNNEL ioctls for
adding, changing and deleting gre tunnels.

Allow the SIOCADDTUNNEL, SIOCCHGTUNNEL and SIOCDELTUNNEL ioctls for
adding, changing and deleting ipip tunnels.

Allow the SIOCADDTUNNEL, SIOCCHGTUNNEL and SIOCDELTUNNEL ioctls for
adding, changing and deleting ipsec virtual tunnel interfaces.

Allow setting the MRT_INIT, MRT_DONE, MRT_ADD_VIF, MRT_DEL_VIF, MRT_ADD_MFC,
MRT_DEL_MFC, MRT_ASSERT, MRT_PIM, MRT_TABLE socket options on multicast routing
sockets.

Allow setting and receiving IPOPT_CIPSO, IP_OPT_SEC, IP_OPT_SID and
arbitrary ip options.

Allow setting IP_SEC_POLICY/IP_XFRM_POLICY ipv4 socket option.
Allow setting the IP_TRANSPARENT ipv4 socket option.
Allow setting the TCP_REPAIR socket option.
Allow setting the TCP_CONGESTION socket option.

Signed-off-by: "Eric W. Biederman" 
Signed-off-by: David S. Miller

ipip: fix sparse warnings in ipip_netlink_parms()

2012-11-15T18:46:29+00:00

This change fixes two sparse warnings triggered by casting the ip addresses
from netlink messages in an u32 instead of be32. This change corrects that
in order to resolve the sparse warnings.

Reported-by: Fengguang Wu 
Signed-off-by: Nicolas Dichtel 
Signed-off-by: David S. Miller

ipip: add support of link creation via rtnl

2012-11-15T03:02:38+00:00

This patch add the support of 'ip link .. type ipip'.

Signed-off-by: Nicolas Dichtel 
Signed-off-by: David S. Miller

ipip/rtnl: add IFLA_IPTUN_PMTUDISC on dump

2012-11-15T03:02:38+00:00

This parameter was missing in the dump.

Signed-off-by: Nicolas Dichtel 
Signed-off-by: David S. Miller

ipip: always notify change when params are updated

2012-11-15T03:02:38+00:00

netdev_state_change() was called only when end points or link was updated. Now
that all parameters are advertised via netlink, we must advertise any change.

This patch also prepares the support of ipip tunnels management via rtnl. The
code which update tunnels will be put in a new function.

Signed-off-by: Nicolas Dichtel 
Signed-off-by: David S. Miller

net: unify for_each_ip_tunnel_rcu()

2012-11-14T23:49:50+00:00

The defitions of for_each_ip_tunnel_rcu() are same,
so unify it. Also, don't hide the parameter 't'.

Cc: David S. Miller 
Signed-off-by: Cong Wang 
Signed-off-by: David S. Miller

net: convert __IPTUNNEL_XMIT() to an inline function

2012-11-14T23:49:50+00:00

__IPTUNNEL_XMIT() is an ugly macro, convert it to a static
inline function, so make it more readable.

IPTUNNEL_XMIT() is unused, just remove it.

Cc: David S. Miller 
Signed-off-by: Cong Wang 
Signed-off-by: David S. Miller

ipip: advertise tunnel param via rtnl

2012-11-10T00:36:20+00:00

It is usefull for daemons that monitor link event to have the full parameters of
these interfaces when a rtnl message is sent.
It allows also to dump them via rtnetlink.

It is based on what is done for GRE tunnels.

Signed-off-by: Nicolas Dichtel 
Acked-by: Eric Dumazet 
Signed-off-by: David S. Miller

ipip: add GSO support

2012-11-09T22:01:05+00:00

In commit 6b78f16e4b (gre: add GSO support) we added GSO support to GRE
tunnels.

This patch does the same for IPIP tunnels.

Performance of single TCP flow over an IPIP tunnel is increased by 40%

Signed-off-by: Eric Dumazet 
Cc: Maciej Żenczykowski 
Cc: Tom Herbert 
Cc: Willem de Bruijn 
Signed-off-by: David S. Miller

tunnel: drop packet if ECN present with not-ECT

2012-09-27T22:12:37+00:00

Linux tunnels were written before RFC6040 and therefore never
implemented the corner case of ECN getting set in the outer header
and the inner header not being ready for it.

Section 4.2.  Default Tunnel Egress Behaviour.
 o If the inner ECN field is Not-ECT, the decapsulator MUST NOT
      propagate any other ECN codepoint onwards.  This is because the
      inner Not-ECT marking is set by transports that rely on dropped
      packets as an indication of congestion and would not understand or
      respond to any other ECN codepoint [RFC4774].  Specifically:

      *  If the inner ECN field is Not-ECT and the outer ECN field is
         CE, the decapsulator MUST drop the packet.

      *  If the inner ECN field is Not-ECT and the outer ECN field is
         Not-ECT, ECT(0), or ECT(1), the decapsulator MUST forward the
         outgoing packet with the ECN field cleared to Not-ECT.

This patch moves the ECN decap logic out of the individual tunnels
into a common place.

It also adds logging to allow detecting broken systems that
set ECN bits incorrectly when tunneling (or an intermediate
router might be changing the header).

Overloads rx_frame_error to keep track of ECN related error.

Thanks to Chris Wright who caught this while reviewing the new VXLAN
tunnel.

This code was tested by injecting faulty logic in other end GRE
to send incorrectly encapsulated packets.

Signed-off-by: Stephen Hemminger 
Signed-off-by: David S. Miller