During slow path packet processing, if the action is to output to a
tunnel port, the slow path processing of the encapsulated packet
continues on the underlay bridge and additional actions (e.g. optional
VLAN encapsulation, bond link selection and finally output to port) are
collected there.
To prepare for a continuation of the processing of the original packet
(e.g. output to other tunnel ports in a flooding scenario), the
“tunnel_push” action and the actions of the underlay bridge are
encapsulated in a clone() action to preserve the original packet.
If the underlay bridge decides to drop the tunnel packet (for example if
both bonded ports are down simultaneously), the clone(tunnel_push))
actions previously generated as part of translation of the output to
tunnel port are discarded and a stand-alone tunnel_push action is added
instead. Thus the tunnel header is pushed on to the original packet.
This is the bug.
Consequences: If packet processing continues with sending to further
tunnel ports, multiple tunnel header pushes will happen on the original
packet as typically the tunnels all traverse the same underlay bond
which is down. The packet may not have enough headroom to accommodate
all the tunnel headers. OVS crashes if it runs out of space while trying
to push the tunnel headers.
Even in case there is enough headroom, the packet will not be freed
since the accumulated action list contains only the tunnel header push
action without any output port action. Thus, we either have a crash or a
packet buffer leak.
Signed-off-by: Anju Thomas <anju.tho...@ericsson.com>
---
ofproto/ofproto-dpif-xlate.c | 7 -------
tests/tunnel-push-pop-ipv6.at | 10 +++++-----
tests/tunnel-push-pop.at | 18 +++++++++---------
3 files changed, 14 insertions(+), 21 deletions(-)
diff --git a/ofproto/ofproto-dpif-xlate.c b/ofproto/ofproto-dpif-xlate.c
index 7777ed8..7e69469 100644
--- a/ofproto/ofproto-dpif-xlate.c
+++ b/ofproto/ofproto-dpif-xlate.c
@@ -3510,13 +3510,6 @@ native_tunnel_output(struct xlate_ctx *ctx, const struct
xport *xport,
nl_msg_end_non_empty_nested(ctx->odp_actions, clone_ofs);
} else {
nl_msg_cancel_nested(ctx->odp_actions, clone_ofs);
- /* XXX : There is no real use-case for a tunnel push without
- * any post actions. However keeping it now
- * as is to make the 'make check' happy. Should remove when all the
- * make check tunnel test case does something meaningful on a
- * tunnel encap packets.
- */
- odp_put_tnl_push_action(ctx->odp_actions, &tnl_push_data);
}
/* Restore context status. */
diff --git a/tests/tunnel-push-pop-ipv6.at b/tests/tunnel-push-pop-ipv6.at
index 7ca522a..c9e4a2b 100644
--- a/tests/tunnel-push-pop-ipv6.at
+++ b/tests/tunnel-push-pop-ipv6.at
@@ -93,28 +93,28 @@ dnl Check VXLAN 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:
tnl_push(tnl_port(4789),header(size=70,type=4,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=17,tclass=0x0,hlimit=64),udp(src=0,dst=4789,csum=0xffff),vxlan(flags=0x8000000,vni=0x7b)),out_port(100))
+ [Datapath actions: drop
])
dnl Check VXLAN tunnel push set tunnel id by flow and checksum
AT_CHECK([ovs-ofctl add-flow int-br "actions=set_tunnel:124,4"])
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:
tnl_push(tnl_port(4789),header(size=70,type=4,eth(dst=f8:bc:12:44:34:b7,src=aa:55:aa:55:00:00,dl_type=0x86dd),ipv6(src=2001:cafe::88,dst=2001:cafe::93,label=0,proto=17,tclass=0x0,hlimit=64),udp(src=0,dst=4789,csum=0xffff),vxlan(flags=0x8000000,vni=0x7c)),out_port(100))
+ [Datapath actions: drop
])
dnl Check GRE tunnel push
AT_CHECK([ovs-ofctl add-flow int-br action=3])
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:
tnl_push(tnl_port(3),header(size=62,type=3,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=0x2000,proto=0x6558),key=0x1c8)),out_port(100))
+ [Datapath actions: drop
])
dnl Check Geneve tunnel push
AT_CHECK([ovs-ofctl add-flow int-br
"actions=set_field:2001:cafe::92->tun_ipv6_dst,5"])
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:
tnl_push(tnl_port(6081),header(size=70,type=5,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=17,tclass=0x0,hlimit=64),udp(src=0,dst=6081,csum=0xffff),geneve(vni=0x7b)),out_port(100))
+ [Datapath actions: drop
])
dnl Check Geneve tunnel push with options
@@ -122,7 +122,7 @@ AT_CHECK([ovs-ofctl add-tlv-map int-br
"{class=0xffff,type=0x80,len=4}->tun_meta
AT_CHECK([ovs-ofctl add-flow int-br
"actions=set_field:2001:cafe::92->tun_ipv6_dst,set_field:0xa->tun_metadata0,5"])
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:
tnl_push(tnl_port(6081),header(size=78,type=5,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=17,tclass=0x0,hlimit=64),udp(src=0,dst=6081,csum=0xffff),geneve(crit,vni=0x7b,options({class=0xffff,type=0x80,len=4,0xa}))),out_port(100))
+ [Datapath actions: drop
])
dnl Check decapsulation of GRE packet
diff --git a/tests/tunnel-push-pop.at b/tests/tunnel-push-pop.at
index cc8b1b5..07832fc 100644
--- a/tests/tunnel-push-pop.at
+++ b/tests/tunnel-push-pop.at
@@ -113,49 +113,49 @@ dnl Check VXLAN 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:55:00:00),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:
tnl_push(tnl_port(4789),header(size=50,type=4,eth(dst=f8:bc:12:44:34:b6,src=aa:55:aa:55:00:00,dl_type=0x0800),ipv4(src=1.1.2.88,dst=1.1.2.92,proto=17,tos=0,ttl=64,frag=0x4000),udp(src=0,dst=4789,csum=0x0),vxlan(flags=0x8000000,vni=0x7b)),out_port(100))
+ [Datapath actions: drop
])
dnl Check VXLAN GPE tunnel push
AT_CHECK([ovs-ofctl add-flow int-br action=8])
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:
tnl_push(tnl_port(4789),header(size=50,type=4,eth(dst=f8:bc:12:44:34:b6,src=aa:55:aa:55:00:00,dl_type=0x0800),ipv4(src=1.1.2.88,dst=1.1.2.92,proto=17,tos=0,ttl=64,frag=0x4000),udp(src=0,dst=4789,csum=0x0),vxlan(flags=0xc000003,vni=0x159)),out_port(100))
+ [Datapath actions: drop
])
dnl Check VXLAN tunnel push set tunnel id by flow and checksum
AT_CHECK([ovs-ofctl add-flow int-br "actions=set_tunnel:124,4"])
AT_CHECK([ovs-appctl ofproto/trace ovs-dummy
'in_port(2),eth(src=f8:bc:12:44:34:b6,dst=aa:55:aa:55:00:00),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:
tnl_push(tnl_port(4789),header(size=50,type=4,eth(dst=f8:bc:12:44:34:b7,src=aa:55:aa:55:00:00,dl_type=0x0800),ipv4(src=1.1.2.88,dst=1.1.2.93,proto=17,tos=0,ttl=64,frag=0x4000),udp(src=0,dst=4789,csum=0xffff),vxlan(flags=0x8000000,vni=0x7c)),out_port(100))
+ [Datapath actions: drop
])
dnl Check GRE tunnel push
AT_CHECK([ovs-ofctl add-flow int-br action=3])
AT_CHECK([ovs-appctl ofproto/trace ovs-dummy
'in_port(2),eth(src=f8:bc:12:44:34:b6,dst=aa:55:aa:55:00:00),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:
tnl_push(tnl_port(3),header(size=42,type=3,eth(dst=f8:bc:12:44:34:b6,src=aa:55:aa:55:00:00,dl_type=0x0800),ipv4(src=1.1.2.88,dst=1.1.2.92,proto=47,tos=0,ttl=64,frag=0x4000),gre((flags=0x2000,proto=0x6558),key=0x1c8)),out_port(100))
+ [Datapath actions: drop
])
dnl Check L3GRE tunnel push
AT_CHECK([ovs-ofctl add-flow int-br action=7])
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:
pop_eth,tnl_push(tnl_port(3),header(size=42,type=3,eth(dst=f8:bc:12:44:34:b6,src=aa:55:aa:55:00:00,dl_type=0x0800),ipv4(src=1.1.2.88,dst=1.1.2.92,proto=47,tos=0,ttl=64,frag=0x4000),gre((flags=0x2000,proto=0x800),key=0x1c8)),out_port(100))
+ [Datapath actions: pop_eth
])
dnl Check Geneve tunnel push
AT_CHECK([ovs-ofctl add-flow int-br "actions=set_field:1.1.2.92->tun_dst,5"])
AT_CHECK([ovs-appctl ofproto/trace ovs-dummy
'in_port(2),eth(src=f8:bc:12:44:34:b6,dst=aa:55:aa:55:00:00),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:
tnl_push(tnl_port(6081),header(size=50,type=5,eth(dst=f8:bc:12:44:34:b6,src=aa:55:aa:55:00:00,dl_type=0x0800),ipv4(src=1.1.2.88,dst=1.1.2.92,proto=17,tos=0,ttl=64,frag=0x4000),udp(src=0,dst=6081,csum=0x0),geneve(vni=0x7b)),out_port(100))
+ [Datapath actions: drop
])
dnl Check Geneve tunnel push with pkt-mark
AT_CHECK([ovs-ofctl add-flow int-br "actions=set_tunnel:234,6"])
AT_CHECK([ovs-appctl ofproto/trace ovs-dummy
'in_port(2),eth(src=f8:bc:12:44:34:b6,dst=aa:55:aa:55:00:00),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:
set(skb_mark(0x4d2)),tnl_push(tnl_port(6081),header(size=50,type=5,eth(dst=f8:bc:12:44:34:b7,src=aa:55:aa:55:00:00,dl_type=0x0800),ipv4(src=1.1.2.88,dst=1.1.2.93,proto=17,tos=0,ttl=64,frag=0x4000),udp(src=0,dst=6081,csum=0x0),geneve(vni=0xea)),out_port(100))
+ [Datapath actions: set(skb_mark(0x4d2))
])
dnl Check Geneve tunnel push with options
@@ -163,7 +163,7 @@ AT_CHECK([ovs-ofctl add-tlv-map int-br
"{class=0xffff,type=0x80,len=4}->tun_meta
AT_CHECK([ovs-ofctl add-flow int-br
"actions=set_field:1.1.2.92->tun_dst,set_field:0xa->tun_metadata0,5"])
AT_CHECK([ovs-appctl ofproto/trace ovs-dummy
'in_port(2),eth(src=f8:bc:12:44:34:b6,dst=aa:55:aa:55:00:00),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:
tnl_push(tnl_port(6081),header(size=58,type=5,eth(dst=f8:bc:12:44:34:b6,src=aa:55:aa:55:00:00,dl_type=0x0800),ipv4(src=1.1.2.88,dst=1.1.2.92,proto=17,tos=0,ttl=64,frag=0x4000),udp(src=0,dst=6081,csum=0x0),geneve(crit,vni=0x7b,options({class=0xffff,type=0x80,len=4,0xa}))),out_port(100))
+ [Datapath actions: drop
])
dnl Check decapsulation of GRE packet
@@ -325,7 +325,7 @@ AT_CHECK([ovs-ofctl add-flow int-br action=3])
AT_CHECK([ovs-appctl ofproto/trace ovs-dummy
'in_port(2),eth(src=f8:bc:12:44:34:b6,dst=aa:55:aa:55:00:00),eth_type(0x0800),ipv4(src=1.1.3.88,dst=1.1.3.112,proto=17,tos=0,ttl=64,frag=no),udp(src=51283,dst=4789)'],
[0], [stdout])
AT_CHECK([tail -1 stdout], [0],
- [Datapath actions:
tnl_push(tnl_port(3),header(size=42,type=3,eth(dst=f8:bc:12:44:34:b6,src=aa:55:aa:55:00:00,dl_type=0x0800),ipv4(src=1.1.2.88,dst=1.1.2.92,proto=47,tos=0,ttl=64,frag=0x4000),gre((flags=0x2000,proto=0x6558),key=0x1c8)),out_port(100))
+ [Datapath actions: drop
])
dnl Verify outer L2 and L3 header flow fields can be matched in the underlay
bridge
--
1.9.1
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