This change fixes bug that breaks ability of machines from external
networks to communicate with machines in SNATed networks (specifically
when using a Distributed router).
Currently when a machine (S1) on an external network tries to talk
over TCP with a machine (A1) in a network that has enabled SNAT, the
connection is established successfully. However after the three-way
handshake, any packets that come from the A1 machine will have their
source address translated by the Distributed router, breaking the
communication.
Existing rule in `build_lrouter_out_snat_flow` that decides which
packets should be SNATed already tries to avoid SNATing packets in
reply direction with `(!ct.trk || !ct.rpl)`. However, previous stages
in the distributed LR egress pipeline do not initiate the CT state.
Additionally we need to commit new connections that originate from
external networks into CT, so that the packets in the reply direction
can be properly identified.
Rationale:
In my original RFC [0], there were questions about the motivation for
fixing this issue. I'll try to summarize why I think this is a bug
that should be fixed.
1. Current implementation for Distributed router already tries to
avoid SNATing packets in the reply direction, it's just missing
initialized CT states to make proper decisions.
2. This same scenario works with Gateway Router. I tested with
following setup:
foo -- R1 -- join - R3 -- alice
|
bar ----------R2
R1 is a Distributed router with SNAT for foo. R2 is a Gateway
router with SNAT for bar. R3 is a Gateway router with no SNAT.
Using 'alice1' as a client I was able to talk over TCP with
'bar1' but connection with 'foo1' failed.
3. Regarding security and "leaking" of internal IPs. Reading through
RFC 4787 [1], 5382 [2] and their update in 7857 [3], the
specifications do not seem to mandate that SNAT implementations
must filter incoming traffic destined directly to the internal
network. Sections like "5. Filtering Behavior" in 4787 and
"4.3 Externally Initiated Connections" in 5382 describe only
behavior for traffic destined to external IP/Port associated
with NAT on the device that performs NAT.
Besides, with the current implementation, it's already possible
to scan the internal network with pings and TCP syn scanning.
4. We do have customers/clouds that depend on this functionality.
This is a scenario that used to work in Openstack with ML2/OVS
and migrating those clouds to ML2/OVN would break it.
[0]https://mail.openvswitch.org/pipermail/ovs-dev/2024-February/411670.html
[1]https://datatracker.ietf.org/doc/html/rfc4787
[2]https://datatracker.ietf.org/doc/html/rfc5382
[3]https://datatracker.ietf.org/doc/html/rfc7857
Signed-off-by: Martin Kalcok <[email protected]>
---
northd/northd.c | 68 ++++++++++++++++++++++++++++++++--------
northd/ovn-northd.8.xml | 29 +++++++++++++++++
tests/ovn-northd.at | 33 ++++++++++++++++----
tests/system-ovn.at | 69 +++++++++++++++++++++++++++++++++++++++++
4 files changed, 180 insertions(+), 19 deletions(-)
diff --git a/northd/northd.c b/northd/northd.c
index 2c3560ce2..25af52d5a 100644
--- a/northd/northd.c
+++ b/northd/northd.c
@@ -14438,20 +14438,27 @@ build_lrouter_out_is_dnat_local(struct lflow_table
*lflows,
static void
build_lrouter_out_snat_match(struct lflow_table *lflows,
- const struct ovn_datapath *od,
- const struct nbrec_nat *nat, struct ds *match,
- bool distributed_nat, int cidr_bits, bool is_v6,
- struct ovn_port *l3dgw_port,
- struct lflow_ref *lflow_ref)
+ const struct ovn_datapath *od,
+ const struct nbrec_nat *nat,
+ struct ds *match,
+ bool distributed_nat, int cidr_bits,
+ bool is_v6,
+ struct ovn_port *l3dgw_port,
+ struct lflow_ref *lflow_ref,
+ bool is_reverse)
{
ds_clear(match);
- ds_put_format(match, "ip && ip%c.src == %s", is_v6 ? '6' : '4',
+ ds_put_format(match, "ip && ip%c.%s == %s",
+ is_v6 ? '6' : '4',
+ is_reverse ? "dst" : "src",
nat->logical_ip);
if (!od->is_gw_router) {
/* Distributed router. */
- ds_put_format(match, " && outport == %s", l3dgw_port->json_key);
+ ds_put_format(match, " && %s == %s",
+ is_reverse ? "inport" : "outport",
+ l3dgw_port->json_key);
if (od->n_l3dgw_ports) {
ds_put_format(match, " && is_chassis_resident(\"%s\")",
distributed_nat
@@ -14462,7 +14469,7 @@ build_lrouter_out_snat_match(struct lflow_table *lflows,
if (nat->allowed_ext_ips || nat->exempted_ext_ips) {
lrouter_nat_add_ext_ip_match(od, lflows, match, nat,
- is_v6, false, cidr_bits,
+ is_v6, is_reverse, cidr_bits,
lflow_ref);
}
}
@@ -14489,7 +14496,8 @@ build_lrouter_out_snat_stateless_flow(struct
lflow_table *lflows,
uint16_t priority = cidr_bits + 1;
build_lrouter_out_snat_match(lflows, od, nat, match, distributed_nat,
- cidr_bits, is_v6, l3dgw_port, lflow_ref);
+ cidr_bits, is_v6, l3dgw_port, lflow_ref,
+ false);
if (!od->is_gw_router) {
/* Distributed router. */
@@ -14536,7 +14544,7 @@ build_lrouter_out_snat_in_czone_flow(struct lflow_table
*lflows,
build_lrouter_out_snat_match(lflows, od, nat, match, distributed_nat,
cidr_bits, is_v6, l3dgw_port,
- lflow_ref);
+ lflow_ref, false);
if (od->n_l3dgw_ports) {
priority += 128;
@@ -14585,12 +14593,14 @@ build_lrouter_out_snat_flow(struct lflow_table
*lflows,
struct ds *actions, bool distributed_nat,
struct eth_addr mac, int cidr_bits, bool is_v6,
struct ovn_port *l3dgw_port,
- struct lflow_ref *lflow_ref)
+ struct lflow_ref *lflow_ref,
+ const struct chassis_features *features)
{
if (strcmp(nat->type, "snat") && strcmp(nat->type, "dnat_and_snat")) {
return;
}
+ struct ds match_all_from_snat = DS_EMPTY_INITIALIZER;
ds_clear(actions);
/* The priority here is calculated such that the
@@ -14599,7 +14609,9 @@ build_lrouter_out_snat_flow(struct lflow_table *lflows,
uint16_t priority = cidr_bits + 1;
build_lrouter_out_snat_match(lflows, od, nat, match, distributed_nat,
- cidr_bits, is_v6, l3dgw_port, lflow_ref);
+ cidr_bits, is_v6, l3dgw_port, lflow_ref,
+ false);
+ ds_clone(&match_all_from_snat, match);
if (!od->is_gw_router) {
/* Distributed router. */
@@ -14624,6 +14636,36 @@ build_lrouter_out_snat_flow(struct lflow_table *lflows,
priority, ds_cstr(match),
ds_cstr(actions), &nat->header_,
lflow_ref);
+
+ /* For the SNAT networks, we need to make sure that connections are
+ * properly tracked so we can decide whether to perform SNAT on traffic
+ * exiting the network. */
+ if (features->ct_commit_to_zone && !strcmp(nat->type, "snat") &&
+ !od->is_gw_router) {
+ /* For traffic that comes from SNAT network, initiate CT state before
+ * entering S_ROUTER_OUT_SNAT to allow matching on various CT states.
+ */
+ ovn_lflow_add(lflows, od, S_ROUTER_OUT_POST_UNDNAT, 70,
+ ds_cstr(&match_all_from_snat), "ct_snat; ",
+ lflow_ref);
+
+ build_lrouter_out_snat_match(lflows, od, nat, match,
+ distributed_nat, cidr_bits, is_v6,
+ l3dgw_port, lflow_ref, true);
+
+ /* New traffic that goes into SNAT network is committed to CT to avoid
+ * SNAT-ing replies.*/
+ ovn_lflow_add(lflows, od, S_ROUTER_OUT_SNAT, priority,
+ ds_cstr(match), "ct_snat;",
+ lflow_ref);
+
+ ds_put_cstr(match, "&& ct.new");
+ ovn_lflow_add(lflows, od, S_ROUTER_OUT_POST_SNAT, priority,
+ ds_cstr(match), "ct_commit(snat); next; ",
+ lflow_ref);
+ }
+
+ ds_destroy(&match_all_from_snat);
}
static void
@@ -15167,7 +15209,7 @@ build_lrouter_nat_defrag_and_lb(
} else {
build_lrouter_out_snat_flow(lflows, od, nat, match, actions,
distributed_nat, mac, cidr_bits, is_v6,
- l3dgw_port, lflow_ref);
+ l3dgw_port, lflow_ref, features);
}
/* S_ROUTER_IN_ADMISSION - S_ROUTER_IN_IP_INPUT */
diff --git a/northd/ovn-northd.8.xml b/northd/ovn-northd.8.xml
index 17b414144..ce6fd1270 100644
--- a/northd/ovn-northd.8.xml
+++ b/northd/ovn-northd.8.xml
@@ -4869,6 +4869,13 @@ nd_ns {
<p>
<ul>
+ <li>
+ A priority-70 logical flow is added that initiates CT state for
+ traffic that is configured to be SNATed on Distributed routers.
+ This allows the next table, <code>lr_out_snat</code>, to
+ effectively match on various CT states.
+ </li>
+
<li>
A priority-50 logical flow is added that commits any untracked flows
from the previous table <code>lr_out_undnat</code> for Gateway
@@ -5061,6 +5068,18 @@ nd_ns {
</li>
+ <li>
+ An additional flow is added for traffic that goes in opposite
+ direction (i.e. it enters a network with configured SNAT). Where the
+ flow above matched on <code>ip4.src == <var>A</var> && outport
+ == <var>GW</var></code>, this flow matches on <code> ip4.dst ==
+ <var>A</var> && inport == <var>GW</var></code>. A CT state is
+ initiated for this traffic so that the following table, <code>
+ lr_out_post_snat</code>, can identify whether the traffic flow was
+ initiated from the internal or external network.
+
+ </li>
+
<li>
A priority-0 logical flow with match <code>1</code> has actions
<code>next;</code>.
@@ -5072,6 +5091,16 @@ nd_ns {
<p>
Packets reaching this table are processed according to the flows below:
<ul>
+ <li>
+ Traffic that goes directly into a network configured with SNAT on
+ Distributed routers, and was initiated from an external network (i.e.
+ it matches <code>ct.new</code>), is committed to the SNAT CT zone.
+ This ensures that replies returning from the SNATed network do not
+ have their source address translated. For details about match rules
+ and priority see section "Egress Table 3: SNAT on Distributed
+ Routers".
+ </li>
+
<li>
A priority-0 logical flow that matches all packets not already
handled (match <code>1</code>) and action <code>next;</code>.
diff --git a/tests/ovn-northd.at b/tests/ovn-northd.at
index 0732486f3..d4a1212d0 100644
--- a/tests/ovn-northd.at
+++ b/tests/ovn-northd.at
@@ -1107,7 +1107,8 @@ ovn_start
#
# DR is connected to S1 and CR is connected to S2
-check ovn-sbctl chassis-add gw1 geneve 127.0.0.1
+check ovn-sbctl chassis-add gw1 geneve 127.0.0.1 \
+ -- set chassis gw1 other_config:ct-commit-to-zone="true"
check ovn-nbctl lr-add DR
check ovn-nbctl lrp-add DR DR-S1 02:ac:10:01:00:01 172.16.1.1/24
@@ -1135,6 +1136,7 @@ echo "CR-LRP UUID is: " $uuid
check ovn-nbctl set Logical_Router $cr_uuid options:chassis=gw1
check ovn-nbctl --wait=sb sync
+
ovn-nbctl create Address_Set name=allowed_range addresses=\"1.1.1.1\"
ovn-nbctl create Address_Set name=disallowed_range addresses=\"2.2.2.2\"
@@ -1155,6 +1157,7 @@ AT_CAPTURE_FILE([crflows])
AT_CHECK([grep -e "lr_out_snat" drflows | ovn_strip_lflows], [0], [dnl
table=??(lr_out_snat ), priority=0 , match=(1), action=(next;)
table=??(lr_out_snat ), priority=120 , match=(nd_ns), action=(next;)
+ table=??(lr_out_snat ), priority=161 , match=(ip && ip4.dst ==
50.0.0.11 && inport == "DR-S1" && is_chassis_resident("cr-DR-S1") && ip4.src ==
$allowed_range), action=(ct_snat;)
table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
50.0.0.11 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1") && ip4.dst
== $allowed_range && (!ct.trk || !ct.rpl)), action=(ct_snat(172.16.1.1);)
])
@@ -1185,6 +1188,7 @@ AT_CAPTURE_FILE([crflows2])
AT_CHECK([grep -e "lr_out_snat" drflows2 | ovn_strip_lflows], [0], [dnl
table=??(lr_out_snat ), priority=0 , match=(1), action=(next;)
table=??(lr_out_snat ), priority=120 , match=(nd_ns), action=(next;)
+ table=??(lr_out_snat ), priority=161 , match=(ip && ip4.dst ==
50.0.0.11 && inport == "DR-S1" && is_chassis_resident("cr-DR-S1")),
action=(ct_snat;)
table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
50.0.0.11 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1") && (!ct.trk
|| !ct.rpl)), action=(ct_snat(172.16.1.1);)
table=??(lr_out_snat ), priority=163 , match=(ip && ip4.src ==
50.0.0.11 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1") && ip4.dst
== $disallowed_range), action=(next;)
])
@@ -1279,7 +1283,7 @@ AT_CHECK([grep -e "lr_out_snat" crflows5 |
ovn_strip_lflows], [0], [dnl
table=??(lr_out_snat ), priority=33 , match=(ip && ip4.src ==
50.0.0.11 && ip4.dst == $allowed_range), action=(ip4.src=172.16.1.2; next;)
])
-# Stateful FIP with DISALLOWED_IPs
+# Stateless FIP with DISALLOWED_IPs
ovn-nbctl lr-nat-del DR dnat_and_snat 172.16.1.2
ovn-nbctl lr-nat-del CR dnat_and_snat 172.16.1.2
@@ -5489,7 +5493,8 @@ AT_CHECK([grep "lr_out_snat" lr0flows |
ovn_strip_lflows], [0], [dnl
check ovn-sbctl chassis-add gw1 geneve 127.0.0.1 \
-- set chassis gw1 other_config:ct-no-masked-label="true" \
- -- set chassis gw1 other_config:ovn-ct-lb-related="true"
+ -- set chassis gw1 other_config:ovn-ct-lb-related="true" \
+ -- set chassis gw1 other_config:ct-commit-to-zone="true"
# Create a distributed gw port on lr0
check ovn-nbctl ls-add public
@@ -5590,12 +5595,16 @@ AT_CHECK([grep "lr_out_undnat" lr0flows |
ovn_strip_lflows], [0], [dnl
AT_CHECK([grep "lr_out_post_undnat" lr0flows | ovn_strip_lflows], [0], [dnl
table=??(lr_out_post_undnat ), priority=0 , match=(1), action=(next;)
+ table=??(lr_out_post_undnat ), priority=70 , match=(ip && ip4.src ==
10.0.0.0/24 && outport == "lr0-public" &&
is_chassis_resident("cr-lr0-public")), action=(ct_snat; )
+ table=??(lr_out_post_undnat ), priority=70 , match=(ip && ip4.src ==
10.0.0.10 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")),
action=(ct_snat; )
])
AT_CHECK([grep "lr_out_snat" lr0flows | ovn_strip_lflows], [0], [dnl
table=??(lr_out_snat ), priority=0 , match=(1), action=(next;)
table=??(lr_out_snat ), priority=120 , match=(nd_ns), action=(next;)
+ table=??(lr_out_snat ), priority=153 , match=(ip && ip4.dst ==
10.0.0.0/24 && inport == "lr0-public" && is_chassis_resident("cr-lr0-public")),
action=(ct_snat;)
table=??(lr_out_snat ), priority=153 , match=(ip && ip4.src ==
10.0.0.0/24 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")
&& (!ct.trk || !ct.rpl)), action=(ct_snat(172.168.0.10);)
+ table=??(lr_out_snat ), priority=161 , match=(ip && ip4.dst ==
10.0.0.10 && inport == "lr0-public" && is_chassis_resident("cr-lr0-public")),
action=(ct_snat;)
table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
10.0.0.10 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public") &&
(!ct.trk || !ct.rpl)), action=(ct_snat(172.168.0.30);)
table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
10.0.0.3 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public") &&
(!ct.trk || !ct.rpl)), action=(ct_snat(172.168.0.20);)
])
@@ -5738,12 +5747,16 @@ AT_CHECK([grep "lr_out_undnat" lr0flows |
ovn_strip_lflows], [0], [dnl
AT_CHECK([grep "lr_out_post_undnat" lr0flows | ovn_strip_lflows], [0], [dnl
table=??(lr_out_post_undnat ), priority=0 , match=(1), action=(next;)
+ table=??(lr_out_post_undnat ), priority=70 , match=(ip && ip4.src ==
10.0.0.0/24 && outport == "lr0-public" &&
is_chassis_resident("cr-lr0-public")), action=(ct_snat; )
+ table=??(lr_out_post_undnat ), priority=70 , match=(ip && ip4.src ==
10.0.0.10 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")),
action=(ct_snat; )
])
AT_CHECK([grep "lr_out_snat" lr0flows | ovn_strip_lflows], [0], [dnl
table=??(lr_out_snat ), priority=0 , match=(1), action=(next;)
table=??(lr_out_snat ), priority=120 , match=(nd_ns), action=(next;)
+ table=??(lr_out_snat ), priority=153 , match=(ip && ip4.dst ==
10.0.0.0/24 && inport == "lr0-public" && is_chassis_resident("cr-lr0-public")),
action=(ct_snat;)
table=??(lr_out_snat ), priority=153 , match=(ip && ip4.src ==
10.0.0.0/24 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")
&& (!ct.trk || !ct.rpl)), action=(ct_snat(172.168.0.10);)
+ table=??(lr_out_snat ), priority=161 , match=(ip && ip4.dst ==
10.0.0.10 && inport == "lr0-public" && is_chassis_resident("cr-lr0-public")),
action=(ct_snat;)
table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
10.0.0.10 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public") &&
(!ct.trk || !ct.rpl)), action=(ct_snat(172.168.0.30);)
table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
10.0.0.3 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public") &&
(!ct.trk || !ct.rpl)), action=(ct_snat(172.168.0.20);)
])
@@ -7576,9 +7589,14 @@ ovn_start
# Validate SNAT, DNAT and DNAT_AND_SNAT behavior with multiple
# distributed gateway LRPs.
-check ovn-sbctl chassis-add gw1 geneve 127.0.0.1
-check ovn-sbctl chassis-add gw2 geneve 128.0.0.1
-check ovn-sbctl chassis-add gw3 geneve 129.0.0.1
+check ovn-sbctl chassis-add gw1 geneve 127.0.0.1 \
+ -- set chassis gw1 other_config:ct-commit-to-zone="true"
+
+check ovn-sbctl chassis-add gw2 geneve 128.0.0.1 \
+ -- set chassis gw2 other_config:ct-commit-to-zone="true"
+
+check ovn-sbctl chassis-add gw3 geneve 129.0.0.1 \
+ -- set chassis gw3 other_config:ct-commit-to-zone="true"
check ovn-nbctl lr-add DR
check ovn-nbctl lrp-add DR DR-S1 02:ac:10:01:00:01 172.16.1.1/24
@@ -7643,6 +7661,9 @@ AT_CHECK([grep lr_in_unsnat lrflows | grep ct_snat |
ovn_strip_lflows], [0], [dn
])
AT_CHECK([grep lr_out_snat lrflows | grep ct_snat | ovn_strip_lflows], [0],
[dnl
+ table=??(lr_out_snat ), priority=161 , match=(ip && ip4.dst ==
20.0.0.10 && inport == "DR-S1" && is_chassis_resident("cr-DR-S1")),
action=(ct_snat;)
+ table=??(lr_out_snat ), priority=161 , match=(ip && ip4.dst ==
20.0.0.10 && inport == "DR-S2" && is_chassis_resident("cr-DR-S2")),
action=(ct_snat;)
+ table=??(lr_out_snat ), priority=161 , match=(ip && ip4.dst ==
20.0.0.10 && inport == "DR-S3" && is_chassis_resident("cr-DR-S3")),
action=(ct_snat;)
table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
20.0.0.10 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1") && (!ct.trk
|| !ct.rpl)), action=(ct_snat(172.16.1.10);)
table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
20.0.0.10 && outport == "DR-S2" && is_chassis_resident("cr-DR-S2") && (!ct.trk
|| !ct.rpl)), action=(ct_snat(10.0.0.10);)
table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
20.0.0.10 && outport == "DR-S3" && is_chassis_resident("cr-DR-S3") && (!ct.trk
|| !ct.rpl)), action=(ct_snat(192.168.0.10);)
diff --git a/tests/system-ovn.at b/tests/system-ovn.at
index c22c7882f..80e9b7d0b 100644
--- a/tests/system-ovn.at
+++ b/tests/system-ovn.at
@@ -3572,6 +3572,40 @@ NS_CHECK_EXEC([foo1], [ping -q -c 3 -i 0.3 -w 2 10.0.0.1
| FORMAT_PING], \
3 packets transmitted, 3 received, 0% packet loss, time 0ms
])
+
+# test_connectivity_from_ext takes parameters 'vm' and 'ip'. It tests
+# icmp, udp and tcp connectivity from external network to the 'vm' on
+# the specified 'ip'.
+test_connectivity_from_ext() {
+ local vm=$1; shift
+ local ip=$1; shift
+
+ # Start listening daemons for UDP and TCP connections
+ NETNS_DAEMONIZE($vm, [nc -l -u 1234], [nc-$vm-$ip-udp.pid])
+ NETNS_DAEMONIZE($vm, [nc -l -k 1235], [nc-$vm-$ip-tcp.pid])
+
+ # Ensure that vm can be pinged on the specified IP
+ NS_CHECK_EXEC([alice1], [ping -q -c 3 -i 0.3 -w 2 $ip | FORMAT_PING], \
+ [0], [dnl
+3 packets transmitted, 3 received, 0% packet loss, time 0ms
+])
+
+ # Perform two consecutive UDP connections to the specified IP
+ NS_CHECK_EXEC([alice1], [nc -u $ip 1234 -p 2000 -z])
+ NS_CHECK_EXEC([alice1], [nc -u $ip 1234 -p 2000 -z])
+
+ # Send data over TCP connection to the specified IP
+ NS_CHECK_EXEC([alice1], [echo "TCP test" | nc --send-only $ip 1235])
+}
+
+# Test access from external network to the internal IP of a VM that
+# has also configured DNAT
+test_connectivity_from_ext foo1 192.168.1.2
+
+# Test access from external network to the internal IP of a VM that
+# does not have DNAT
+test_connectivity_from_ext bar1 192.168.2.2
+
OVS_WAIT_UNTIL([
total_pkts=$(cat ext-net.pcap | wc -l)
test "${total_pkts}" = "3"
@@ -3738,6 +3772,39 @@ sed -e 's/zone=[[0-9]]*/zone=<cleared>/'], [0], [dnl
icmpv6,orig=(src=fd12::2,dst=fd20::2,id=<cleared>,type=128,code=0),reply=(src=fd20::2,dst=fd20::1,id=<cleared>,type=129,code=0),zone=<cleared>
])
+# test_connectivity_from_ext takes parameters 'vm' and 'ip'. It tests
+# icmp, udp and tcp connectivity from external network to the 'vm' on
+# the specified 'ip'.
+test_connectivity_from_ext() {
+ local vm=$1; shift
+ local ip=$1; shift
+
+ # Start listening daemons for UDP and TCP connections
+ NETNS_DAEMONIZE($vm, [nc -l -u 1234], [nc-$vm-$ip-udp.pid])
+ NETNS_DAEMONIZE($vm, [nc -l -k 1235], [nc-$vm-$ip-tcp.pid])
+
+ # Ensure that vm can be pinged on the specified IP
+ NS_CHECK_EXEC([alice1], [ping -q -c 3 -i 0.3 -w 2 $ip | FORMAT_PING], \
+ [0], [dnl
+3 packets transmitted, 3 received, 0% packet loss, time 0ms
+])
+
+ # Perform two consecutive UDP connections to the specified IP
+ NS_CHECK_EXEC([alice1], [nc -u $ip 1234 -p 2000 -z])
+ NS_CHECK_EXEC([alice1], [nc -u $ip 1234 -p 2000 -z])
+
+ # Send data over TCP connection to the specified IP
+ NS_CHECK_EXEC([alice1], [echo "TCP test" | nc --send-only $ip 1235])
+}
+
+# Test access from external network to the internal IP of a VM that
+# has also configured DNAT
+test_connectivity_from_ext foo1 fd11::2
+
+# Test access from external network to the internal IP of a VM that
+# does not have DNAT
+test_connectivity_from_ext bar1 fd12::2
+
OVS_APP_EXIT_AND_WAIT([ovn-controller])
as ovn-sb
@@ -3918,6 +3985,7 @@ NS_CHECK_EXEC([foo2], [ping -q -c 3 -i 0.3 -w 2
172.16.1.4 | FORMAT_PING], \
AT_CHECK([ovs-appctl dpctl/dump-conntrack | grep icmp | FORMAT_CT(172.16.1.1)
| \
sed -e 's/zone=[[0-9]]*/zone=<cleared>/'], [0], [dnl
icmp,orig=(src=172.16.1.1,dst=172.16.1.4,id=<cleared>,type=8,code=0),reply=(src=192.168.2.2,dst=172.16.1.1,id=<cleared>,type=0,code=0),zone=<cleared>
+icmp,orig=(src=172.16.1.1,dst=192.168.2.2,id=<cleared>,type=8,code=0),reply=(src=192.168.2.2,dst=172.16.1.1,id=<cleared>,type=0,code=0),zone=<cleared>
icmp,orig=(src=192.168.1.3,dst=172.16.1.4,id=<cleared>,type=8,code=0),reply=(src=172.16.1.4,dst=172.16.1.1,id=<cleared>,type=0,code=0),zone=<cleared>
])
@@ -4086,6 +4154,7 @@ NS_CHECK_EXEC([foo2], [ping -q -c 3 -i 0.3 -w 2 fd20::4 |
FORMAT_PING], \
AT_CHECK([ovs-appctl dpctl/dump-conntrack | FORMAT_CT(fd20::1) | \
sed -e 's/zone=[[0-9]]*/zone=<cleared>/'], [0], [dnl
icmpv6,orig=(src=fd11::3,dst=fd20::4,id=<cleared>,type=128,code=0),reply=(src=fd20::4,dst=fd20::1,id=<cleared>,type=129,code=0),zone=<cleared>
+icmpv6,orig=(src=fd20::1,dst=fd12::2,id=<cleared>,type=128,code=0),reply=(src=fd12::2,dst=fd20::1,id=<cleared>,type=129,code=0),zone=<cleared>
icmpv6,orig=(src=fd20::1,dst=fd20::4,id=<cleared>,type=128,code=0),reply=(src=fd12::2,dst=fd20::1,id=<cleared>,type=129,code=0),zone=<cleared>
])
--
2.40.1
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