Merge branch 'bareudp-several-code-cleanup-for-bareudp-module'

Taehee Yoo says:

====================
bareudp: several code cleanup for bareudp module

This patchset is to cleanup bareudp module cod

Merge branch 'bareudp-several-code-cleanup-for-bareudp-module'

Taehee Yoo says:

====================
bareudp: several code cleanup for bareudp module

This patchset is to cleanup bareudp module code.

1. The first patch is to add module alias
In the current bareudp code, there is no module alias.
So, RTNL couldn't load bareudp module automatically.

2. The second patch is to add extack message.
The extack error message is useful for noticing specific errors
when command is failed.

3. The third patch is to remove unnecessary udp_encap_enable().
In the bareudp_socket_create(), udp_encap_enable() is called.
But, the it's already called in the setup_udp_tunnel_sock().
So, it could be removed.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

show more ...

bareudp: remove unnecessary udp_encap_enable() in bareudp_socket_create()

In the current code, udp_encap_enable() is called in
bareudp_socket_create().
But, setup_udp_tunnel_sock() internally calls

bareudp: remove unnecessary udp_encap_enable() in bareudp_socket_create()

In the current code, udp_encap_enable() is called in
bareudp_socket_create().
But, setup_udp_tunnel_sock() internally calls udp_encap_enable().
So, udp_encap_enable() is unnecessary.

Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

show more ...

bareudp: print error message when command fails

When bareudp netlink command fails, it doesn't print any error message.
So, users couldn't know the exact reason.
In order to tell the exact reason to

bareudp: print error message when command fails

When bareudp netlink command fails, it doesn't print any error message.
So, users couldn't know the exact reason.
In order to tell the exact reason to the user, the extack error message
is used in this patch.

Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

show more ...

bareudp: add module alias

In the current bareudp code, there is no module alias.
So, RTNL couldn't load bareudp module automatically.

Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: D

bareudp: add module alias

In the current bareudp code, there is no module alias.
So, RTNL couldn't load bareudp module automatically.

Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

show more ...

bareudp: Fix uninitialized variable warnings.

drivers/net/bareudp.c: In function 'bareudp_xmit_skb':
drivers/net/bareudp.c:346:9: warning: 'err' may be used uninitialized in this function [-Wmaybe-u

bareudp: Fix uninitialized variable warnings.

drivers/net/bareudp.c: In function 'bareudp_xmit_skb':
drivers/net/bareudp.c:346:9: warning: 'err' may be used uninitialized in this function [-Wmaybe-uninitialized]
346 | return err;
| ^~~
drivers/net/bareudp.c: In function 'bareudp6_xmit_skb':
drivers/net/bareudp.c:407:9: warning: 'err' may be used uninitialized in this function [-Wmaybe-uninitialized]
407 | return err;

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

show more ...

Merge branch 'Bare-UDP-L3-Encapsulation-Module'

Martin Varghese says:

====================
Bare UDP L3 Encapsulation Module

There are various L3 encapsulation standards using UDP being discussed t

Merge branch 'Bare-UDP-L3-Encapsulation-Module'

Martin Varghese says:

====================
Bare UDP L3 Encapsulation Module

There are various L3 encapsulation standards using UDP being discussed to
leverage the UDP based load balancing capability of different networks.
MPLSoUDP (__ https://tools.ietf.org/html/rfc7510) is one among them.

The Bareudp tunnel module provides a generic L3 encapsulation tunnelling
support for tunnelling different L3 protocols like MPLS, IP, NSH etc. inside
a UDP tunnel.

Special Handling
----------------
The bareudp device supports special handling for MPLS & IP as they can have
multiple ethertypes.
MPLS procotcol can have ethertypes ETH_P_MPLS_UC (unicast) & ETH_P_MPLS_MC (multicast).
IP protocol can have ethertypes ETH_P_IP (v4) & ETH_P_IPV6 (v6).
This special handling can be enabled only for ethertypes ETH_P_IP & ETH_P_MPLS_UC
with a flag called multiproto mode.

Usage
------

1) Device creation & deletion

a) ip link add dev bareudp0 type bareudp dstport 6635 ethertype 0x8847.

This creates a bareudp tunnel device which tunnels L3 traffic with ethertype
0x8847 (MPLS traffic). The destination port of the UDP header will be set to
6635.The device will listen on UDP port 6635 to receive traffic.

b) ip link delete bareudp0

2) Device creation with multiple proto mode enabled

There are two ways to create a bareudp device for MPLS & IP with multiproto mode
enabled.

a) ip link add dev bareudp0 type bareudp dstport 6635 ethertype 0x8847 multiproto

b) ip link add dev bareudp0 type bareudp dstport 6635 ethertype mpls

3) Device Usage

The bareudp device could be used along with OVS or flower filter in TC.
The OVS or TC flower layer must set the tunnel information in SKB dst field before
sending packet buffer to the bareudp device for transmission. On reception the
bareudp device extracts and stores the tunnel information in SKB dst field before
passing the packet buffer to the network stack.

Why not FOU ?
------------
FOU by design does l4 encapsulation.It maps udp port to ipproto (IP protocol number for l4 protocol).
Bareudp acheives a generic l3 encapsulation.It maps udp port to l3 ethertype.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

show more ...

net: Special handling for IP & MPLS.

Special handling is needed in bareudp module for IP & MPLS as they
support more than one ethertypes.

MPLS has 2 ethertypes. 0x8847 for MPLS unicast and 0x8848 f

net: Special handling for IP & MPLS.

Special handling is needed in bareudp module for IP & MPLS as they
support more than one ethertypes.

MPLS has 2 ethertypes. 0x8847 for MPLS unicast and 0x8848 for MPLS multicast.
While decapsulating MPLS packet from UDP packet the tunnel destination IP
address is checked to determine the ethertype. The ethertype of the packet
will be set to 0x8848 if the tunnel destination IP address is a multicast
IP address. The ethertype of the packet will be set to 0x8847 if the
tunnel destination IP address is a unicast IP address.

IP has 2 ethertypes.0x0800 for IPV4 and 0x86dd for IPv6. The version
field of the IP header tunnelled will be checked to determine the ethertype.

This special handling to tunnel additional ethertypes will be disabled
by default and can be enabled using a flag called multiproto. This flag can
be used only with ethertypes 0x8847 and 0x0800.

Signed-off-by: Martin Varghese <martin.varghese@nokia.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

show more ...

net: UDP tunnel encapsulation module for tunnelling different protocols like MPLS, IP, NSH etc.

The Bareudp tunnel module provides a generic L3 encapsulation
tunnelling module for tunnelling differe

net: UDP tunnel encapsulation module for tunnelling different protocols like MPLS, IP, NSH etc.

The Bareudp tunnel module provides a generic L3 encapsulation
tunnelling module for tunnelling different protocols like MPLS,
IP,NSH etc inside a UDP tunnel.

Signed-off-by: Martin Varghese <martin.varghese@nokia.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

show more ...