[ovs-dev] [PATCHv5] tunnel: Add layer 2 IPv6 GRE encapsulation support.

Gregory Rose gvrose8192 at gmail.com
Mon Jul 1 22:10:17 UTC 2019



On 7/1/2019 12:45 PM, William Tu wrote:
> The patch adds ip6gre support. Tunnel type 'ip6gre' with packet_type=
> legacy_l2 is a layer 2 GRE tunnel over IPv6, carrying inner ethernet packets
> and encap with GRE header with outer IPv6 header.  Encapsulation of layer 3
> packet over IPv6 GRE, ip6gre, is not supported yet.  I tested it by running:
>    # make check-kernel TESTSUITEFLAGS='-k ip6gre'
> under kernel 5.2 and for userspace:

Hi William,

I tried this on a system with the 5.2-rc5+ kernel and got the following 
results:

## ------------------------------- ##
## openvswitch 2.11.90 test suite. ##
## ------------------------------- ##
  12: datapath - ping over ip6gre L2 tunnel           skipped 
(system-traffic.at:344)

## ------------- ##
## Test results. ##
## ------------- ##

0 tests were successful.
1 test was skipped.

This is on a Ubuntu 16.04 distro with the upstream kernel installed.  
What system/distro base did you use?

Thanks,

- Greg


>    # make check TESTSUITEFLAGS='-k ip6gre'
>
> Signed-off-by: William Tu <u9012063 at gmail.com>
> ---
> v1-v2
>   - rebase to master
> v2-v3
>    - update documentation suggested by Eli
> v3-v4
>    - squash Eli's documentation
> v4-v5
>    - remove using 'ip6gretap', use only 'ip6gre' with
>      options:packet_type=legacy_l2
> ---
>   Documentation/faq/configuration.rst | 13 +++++++
>   NEWS                                |  1 +
>   datapath/linux/compat/ip6_gre.c     |  2 +-
>   lib/dpif-netlink-rtnl.c             |  8 ++++-
>   tests/system-traffic.at             | 40 +++++++++++++++++++++
>   tests/tunnel-push-pop-ipv6.at       | 69 +++++++++++++++++++++++++++++++++++++
>   vswitchd/vswitch.xml                | 32 ++++++++++-------
>   7 files changed, 151 insertions(+), 14 deletions(-)
>
> diff --git a/Documentation/faq/configuration.rst b/Documentation/faq/configuration.rst
> index cb2c6b4eca98..ff3b71a5d4ef 100644
> --- a/Documentation/faq/configuration.rst
> +++ b/Documentation/faq/configuration.rst
> @@ -212,6 +212,19 @@ Q: Does Open vSwitch support ERSPAN?
>                   options:erspan_ver=2 options:erspan_dir=1 \
>                   options:erspan_hwid=4
>   
> +Q: Does Open vSwitch support IPv6 GRE?
> +
> +    A: Yes. L2 tunnel interface GRE over IPv6 is supported.
> +    L3 GRE tunnel over IPv6 is not supported.
> +
> +    ::
> +
> +        $ ovs-vsctl add-br br0
> +        $ ovs-vsctl add-port br0 at_gre0 -- \
> +                set int at_gre0 type=ip6gre \
> +                options:remote_ip=fc00:100::1 \
> +                options:packet_type=legacy_l2
> +
>   Q: How do I connect two bridges?
>   
>       A: First, why do you want to do this?  Two connected bridges are not much
> diff --git a/NEWS b/NEWS
> index a38ab258fc6c..c7e84ed7931d 100644
> --- a/NEWS
> +++ b/NEWS
> @@ -47,6 +47,7 @@ Post-v2.11.0
>      - Linux datapath:
>        * Support for the kernel versions 4.19.x and 4.20.x.
>        * Support for the kernel version 5.0.x.
> +   - Add L2 GRE tunnel over IPv6 support.
>   
>   
>   v2.11.0 - 19 Feb 2019
> diff --git a/datapath/linux/compat/ip6_gre.c b/datapath/linux/compat/ip6_gre.c
> index ca4e66133570..ab50c72d0753 100644
> --- a/datapath/linux/compat/ip6_gre.c
> +++ b/datapath/linux/compat/ip6_gre.c
> @@ -2550,7 +2550,7 @@ static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
>   };
>   
>   static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
> -	.kind		= "ip6gre",
> +	.kind		= "ip6gretap",
>   	.maxtype	= RPL_IFLA_GRE_MAX,
>   	.policy		= ip6gre_policy,
>   	.priv_size	= sizeof(struct ip6_tnl),
> diff --git a/lib/dpif-netlink-rtnl.c b/lib/dpif-netlink-rtnl.c
> index 2e23a8c14fcf..582274c46774 100644
> --- a/lib/dpif-netlink-rtnl.c
> +++ b/lib/dpif-netlink-rtnl.c
> @@ -104,7 +104,13 @@ vport_type_to_kind(enum ovs_vport_type type,
>       case OVS_VPORT_TYPE_IP6ERSPAN:
>           return "ip6erspan";
>       case OVS_VPORT_TYPE_IP6GRE:
> -        return "ip6gre";
> +        if (tnl_cfg->pt_mode == NETDEV_PT_LEGACY_L2) {
> +            return "ip6gretap";
> +        } else if (tnl_cfg->pt_mode == NETDEV_PT_LEGACY_L3) {
> +            return NULL;
> +        } else {
> +            return NULL;
> +        }
>       case OVS_VPORT_TYPE_NETDEV:
>       case OVS_VPORT_TYPE_INTERNAL:
>       case OVS_VPORT_TYPE_LISP:
> diff --git a/tests/system-traffic.at b/tests/system-traffic.at
> index d23ee897b0b2..8ea450887076 100644
> --- a/tests/system-traffic.at
> +++ b/tests/system-traffic.at
> @@ -340,6 +340,46 @@ NS_CHECK_EXEC([at_ns0], [ping -s 3200 -q -c 3 -i 0.3 -w 2 10.1.1.100 | FORMAT_PI
>   OVS_TRAFFIC_VSWITCHD_STOP
>   AT_CLEANUP
>   
> +AT_SETUP([datapath - ping over ip6gre L2 tunnel])
> +OVS_CHECK_KERNEL_EXCL(3, 10, 4, 15)
> +OVS_CHECK_GRE()
> +OVS_CHECK_ERSPAN()
> +
> +OVS_TRAFFIC_VSWITCHD_START()
> +ADD_BR([br-underlay])
> +
> +AT_CHECK([ovs-ofctl add-flow br0 "actions=normal"])
> +AT_CHECK([ovs-ofctl add-flow br-underlay "actions=normal"])
> +
> +ADD_NAMESPACES(at_ns0)
> +
> +dnl Set up underlay link from host into the namespace using veth pair.
> +ADD_VETH(p0, at_ns0, br-underlay, "fc00:100::1/96", [], [], nodad)
> +AT_CHECK([ip addr add dev br-underlay "fc00:100::100/96" nodad])
> +AT_CHECK([ip link set dev br-underlay up])
> +
> +dnl Set up tunnel endpoints on OVS outside the namespace and with a native
> +dnl linux device inside the namespace.
> +ADD_OVS_TUNNEL6([ip6gre], [br0], [at_gre0], [fc00:100::1], [10.1.1.100/24],
> +                [options:packet_type=legacy_l2])
> +ADD_NATIVE_TUNNEL6([ip6gretap], [ns_gretap0], [at_ns0], [fc00:100::100],
> +                   [10.1.1.1/24], [local fc00:100::1])
> +
> +OVS_WAIT_UNTIL([ip netns exec at_ns0 ping6 -c 2 fc00:100::100])
> +
> +dnl First, check the underlay
> +NS_CHECK_EXEC([at_ns0], [ping6 -q -c 3 -i 0.3 -w 2 fc00:100::100 | FORMAT_PING], [0], [dnl
> +3 packets transmitted, 3 received, 0% packet loss, time 0ms
> +])
> +
> +dnl Okay, now check the overlay with different packet sizes
> +NS_CHECK_EXEC([at_ns0], [ping -q -c 3 -i 0.3 -w 2 10.1.1.100 | FORMAT_PING], [0], [dnl
> +3 packets transmitted, 3 received, 0% packet loss, time 0ms
> +])
> +OVS_TRAFFIC_VSWITCHD_STOP
> +AT_CLEANUP
> +
> +
>   AT_SETUP([datapath - ping over erspan v1 tunnel])
>   OVS_CHECK_KERNEL_EXCL(3, 10, 4, 15)
>   OVS_CHECK_GRE()
> diff --git a/tests/tunnel-push-pop-ipv6.at b/tests/tunnel-push-pop-ipv6.at
> index cbdd5a32f719..59723e63b845 100644
> --- a/tests/tunnel-push-pop-ipv6.at
> +++ b/tests/tunnel-push-pop-ipv6.at
> @@ -1,5 +1,74 @@
>   AT_BANNER([tunnel_push_pop_ipv6])
>   
> +AT_SETUP([tunnel_push_pop_ipv6 - ip6gre])
> +
> +OVS_VSWITCHD_START([add-port br0 p0 -- set Interface p0 type=dummy ofport_request=1 other-config:hwaddr=aa:55:aa:55:00:00])
> +AT_CHECK([ovs-vsctl add-br int-br -- set bridge int-br datapath_type=dummy], [0])
> +AT_CHECK([ovs-vsctl add-port int-br t2 -- set Interface t2 type=ip6gre \
> +                       options:remote_ip=2001:cafe::92 ofport_request=2\
> +                       options:packet_type=legacy_l2
> +                       ], [0])
> +
> +AT_CHECK([ovs-appctl dpif/show], [0], [dnl
> +dummy at ovs-dummy: hit:0 missed:0
> +  br0:
> +    br0 65534/100: (dummy-internal)
> +    p0 1/1: (dummy)
> +  int-br:
> +    int-br 65534/2: (dummy-internal)
> +    t2 2/6: (ip6gre: remote_ip=2001:cafe::92)
> +])
> +
> +dnl First setup dummy interface IP address, then add the route
> +dnl so that tnl-port table can get valid IP address for the device.
> +AT_CHECK([ovs-appctl netdev-dummy/ip6addr br0 2001:cafe::88/24], [0], [OK
> +])
> +AT_CHECK([ovs-appctl netdev-dummy/ip4addr br0 1.1.2.88/24], [0], [OK
> +])
> +AT_CHECK([ovs-appctl ovs/route/add 2001:cafe::92/24 br0], [0], [OK
> +])
> +
> +AT_CHECK([ovs-ofctl add-flow br0 action=normal])
> +
> +dnl Check Neighbour discovery.
> +AT_CHECK([ovs-vsctl -- set Interface p0 options:pcap=p0.pcap])
> +
> +AT_CHECK([ovs-appctl netdev-dummy/receive int-br 'in_port(2),eth(src=aa:55:aa:55:00:00,dst=f8:bc:12:ff:ff:ff),eth_type(0x0800),ipv4(src=1.1.3.92,dst=1.1.3.88,proto=1,tos=0,ttl=64,frag=no),icmp(type=0,code=0)'])
> +AT_CHECK([ovs-pcap p0.pcap > p0.pcap.txt 2>&1])
> +
> +AT_CHECK([cat p0.pcap.txt | grep 92aa55aa55000086dd6000000000203aff2001cafe | uniq], [0], [dnl
> +3333ff000092aa55aa55000086dd6000000000203aff2001cafe000000000000000000000088ff0200000000000000000001ff00009287004d48000000002001cafe0000000000000000000000920101aa55aa550000
> +])
> +
> +dnl
> +AT_CHECK([ovs-appctl netdev-dummy/receive p0 'in_port(1),eth(src=f8:bc:12:44:34:b6,dst=aa:55:aa:55:00:00),eth_type(0x86dd),ipv6(src=2001:cafe::92,dst=2001:cafe::88,label=0,proto=58,tclass=0,hlimit=255,frag=no),icmpv6(type=136,code=0),nd(target=2001:cafe::92,sll=00:00:00:00:00:00,tll=f8:bc:12:44:34:b6)'])
> +
> +AT_CHECK([ovs-appctl tnl/arp/show | tail -n+3 | sort], [0], [dnl
> +2001:cafe::92                                 f8:bc:12:44:34:b6   br0
> +])
> +
> +AT_CHECK([ovs-appctl tnl/ports/show |sort], [0], [dnl
> +Listening ports:
> +ip6gre_sys (6) ref_cnt=1
> +])
> +
> +dnl Check IPv6 GRE tunnel pop
> +AT_CHECK([ovs-appctl ofproto/trace ovs-dummy 'in_port(1),eth(src=f8:bc:12:44:34:b6,dst=aa:55:aa:55:00:00),eth_type(0x86dd),ipv6(src=2001:cafe::92,dst=2001:cafe::88,label=0,proto=47,tclass=0x0,hlimit=64)'], [0], [stdout])
> +AT_CHECK([tail -1 stdout], [0],
> +  [Datapath actions: tnl_pop(6)
> +])
> +
> +dnl Check IPv6 GRE tunnel push
> +AT_CHECK([ovs-ofctl add-flow int-br action=2])
> +AT_CHECK([ovs-appctl ofproto/trace ovs-dummy 'in_port(2),eth(src=f8:bc:12:44:34:b6,dst=aa:55:aa:55:00:01),eth_type(0x0800),ipv4(src=1.1.3.88,dst=1.1.3.112,proto=47,tos=0,ttl=64,frag=no)'], [0], [stdout])
> +
> +AT_CHECK([tail -1 stdout], [0],
> +  [Datapath actions: clone(tnl_push(tnl_port(6),header(size=58,type=109,eth(dst=f8:bc:12:44:34:b6,src=aa:55:aa:55:00:00,dl_type=0x86dd),ipv6(src=2001:cafe::88,dst=2001:cafe::92,label=0,proto=47,tclass=0x0,hlimit=64),gre((flags=0x0,proto=0x6558))),out_port(100)),1)
> +])
> +
> +OVS_VSWITCHD_STOP
> +AT_CLEANUP
> +
>   AT_SETUP([tunnel_push_pop_ipv6 - ip6erspan])
>   
>   OVS_VSWITCHD_START([add-port br0 p0 -- set Interface p0 type=dummy ofport_request=1 other-config:hwaddr=aa:55:aa:55:00:00])
> diff --git a/vswitchd/vswitch.xml b/vswitchd/vswitch.xml
> index bf4b6f8dc621..d143bcc06a2b 100644
> --- a/vswitchd/vswitch.xml
> +++ b/vswitchd/vswitch.xml
> @@ -2561,10 +2561,16 @@
>   
>             <dt><code>gre</code></dt>
>             <dd>
> -            Generic Routing Encapsulation (GRE) over IPv4/IPv6 tunnel,
> +            Generic Routing Encapsulation (GRE) over IPv4 tunnel,
>               configurable to encapsulate layer 2 or layer 3 traffic.
>             </dd>
>   
> +          <dt><code>ip6gre</code></dt>
> +          <dd>
> +            Generic Routing Encapsulation (GRE) over IPv6 tunnel,
> +            encapsulate layer 2 traffic.
> +          </dd>
> +
>             <dt><code>vxlan</code></dt>
>             <dd>
>               <p>
> @@ -2623,8 +2629,8 @@
>       <group title="Tunnel Options">
>         <p>
>           These options apply to interfaces with <ref column="type"/> of
> -        <code>geneve</code>, <code>gre</code>, <code>vxlan</code>,
> -        <code>lisp</code> and <code>stt</code>.
> +        <code>geneve</code>, <code>gre</code>, <code>ip6gre</code>,
> +        <code>vxlan</code>, <code>lisp</code> and <code>stt</code>.
>         </p>
>   
>         <p>
> @@ -2921,10 +2927,10 @@
>           </column>
>         </group>
>   
> -      <group title="Tunnel Options: gre, geneve, and vxlan">
> +      <group title="Tunnel Options: gre, ip6gre, geneve, and vxlan">
>           <p>
> -          <code>gre</code>, <code>geneve</code>, and
> -          <code>vxlan</code> interfaces support these options.
> +          <code>gre</code>, <code>ip6gre</code>, <code>geneve</code>,
> +          and <code>vxlan</code> interfaces support these options.
>           </p>
>   
>           <column name="options" key="csum" type='{"type": "boolean"}'>
> @@ -2938,8 +2944,9 @@
>             <p>
>               When using the upstream Linux kernel module, computation of
>               checksums for <code>geneve</code> and <code>vxlan</code> requires
> -            Linux kernel version 4.0 or higher. <code>gre</code> supports
> -            checksums for all versions of Open vSwitch that support GRE.
> +            Linux kernel version 4.0 or higher. <code>gre</code> and
> +            <code>ip6gre</code> support checksums for all versions of
> +            Open vSwitch that support GRE.
>               The out of tree kernel module distributed as part of OVS
>               can compute all tunnel checksums on any kernel version that it
>               is compatible with.
> @@ -2951,10 +2958,11 @@
>         <group title="Tunnel Options: IPsec">
>           <p>
>             Setting any of these options enables IPsec support for a given
> -          tunnel.  <code>gre</code>, <code>geneve</code>, <code>vxlan</code>,
> -          and <code>stt</code> interfaces support these options.  See the
> -          <code>IPsec</code> section in the <ref table="Open_vSwitch"/> table
> -          for a description of each mode.
> +          tunnel.  <code>gre</code>, <code>ip6gre</code>,
> +          <code>geneve</code>, <code>vxlan</code> and <code>stt</code>
> +          interfaces support these options.  See the <code>IPsec</code>
> +          section in the <ref table="Open_vSwitch"/> table for a description
> +          of each mode.
>           </p>
>           <column name="options" key="psk" type='{"type": "string"}'>
>             <p>



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