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

William Tu u9012063 at gmail.com
Mon Jul 1 19:45:22 UTC 2019


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:
  # 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>
-- 
2.7.4



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