From: Numan Siddique <[email protected]>
IPv6 ND Solicitation (NS) responder logical flows match on ip6.dst
field. These flows when translated to datapath flows also match on
ip6.dst, which means a separate datapath flow per destination IP
address. This may cause significant performance issues in some
setups (particularly ovs-dpdk telco deployments).
This patch addresses this issue by matching on eth.mcast6 so that
datapath flows for normal IPv6 traffic doesn't have to match on
ip6.dst. IPv6 NS packets are generally multicast. A new logical
match "nd_ns_mcast" is added for this purpose.
After this patch, We no longer respond to IPv6 NS unicast packets.
Let the target reply to it, so that the sender has the ability to
monitor the targe liveness via the unicast ND solicitations.
This behavior now matches the IPv4 ARP responder flows. Note that
after the commit [1] which was recently added we now only respond
to IPv4 ARP broadcast packets.
A recent patch [2] from Ilya partially addressed the same datapath
flow explosion issue by matching on eth.mcast6 for MLD packets.
With this patch, we now completely address the datapath flow
explosion issue for IPv6 traffic provided all the logical ports
of a logical switch are not configured with port security.
[1] - c48ed1736a58 ("Do not reply on unicast arps for IPv4 targets.")
[2] - 43c34f2e6676 ("logical-fields: Add missing multicast matches for MLD and
IGMP.")
Note: Documentation for 'eth.mcastv6' and 'ip6.mcast' predicates were
missing from ovn-sb.xml and this patch adds it.
Reported-at: https://issues.redhat.com/browse/FDP-728
Reported-by: Mike Pattrick <[email protected]>
Signed-off-by: Numan Siddique <[email protected]>
---
v1 -> v2
-------
- Addressed review comments from Ilya.
lib/logical-fields.c | 3 ++
northd/northd.c | 21 +++++---
ovn-sb.xml | 3 ++
tests/ovn-northd.at | 4 +-
tests/ovn.at | 4 +-
tests/system-ovn.at | 123 +++++++++++++++++++++++++++++++++++++++++++
6 files changed, 146 insertions(+), 12 deletions(-)
diff --git a/lib/logical-fields.c b/lib/logical-fields.c
index 2c9d3c61bf..5a8b53f2b6 100644
--- a/lib/logical-fields.c
+++ b/lib/logical-fields.c
@@ -293,6 +293,9 @@ ovn_init_symtab(struct shash *symtab)
"icmp6.type == {135, 136} && icmp6.code == 0 && ip.ttl == 255");
expr_symtab_add_predicate(symtab, "nd_ns",
"icmp6.type == 135 && icmp6.code == 0 && ip.ttl == 255");
+ expr_symtab_add_predicate(symtab, "nd_ns_mcast",
+ "ip6.mcast && icmp6.type == 135 && icmp6.code == 0 && "
+ "ip.ttl == 255");
expr_symtab_add_predicate(symtab, "nd_na",
"icmp6.type == 136 && icmp6.code == 0 && ip.ttl == 255");
expr_symtab_add_predicate(symtab, "nd_rs",
diff --git a/northd/northd.c b/northd/northd.c
index c4824aae3b..c9ae1e958f 100644
--- a/northd/northd.c
+++ b/northd/northd.c
@@ -9633,16 +9633,21 @@ build_lswitch_arp_nd_responder_known_ips(struct
ovn_port *op,
op->lflow_ref);
}
- /* For ND solicitations, we need to listen for both the
- * unicast IPv6 address and its all-nodes multicast address,
- * but always respond with the unicast IPv6 address. */
+ /* For ND solicitations:
+ * - Reply only for the all-nodes multicast address(es) of the
+ * logical port IPv6 address(es).
+ *
+ * - Do not reply for unicast ND solicitations. Let the target
+ * reply it, so that the sender has the ability to monitor
+ * the targe liveness via the unicast ND solicitations.
+ */
for (size_t j = 0; j < op->lsp_addrs[i].n_ipv6_addrs; j++) {
ds_clear(match);
- ds_put_format(match,
- "nd_ns && ip6.dst == {%s, %s} && nd.target == %s",
- op->lsp_addrs[i].ipv6_addrs[j].addr_s,
- op->lsp_addrs[i].ipv6_addrs[j].sn_addr_s,
- op->lsp_addrs[i].ipv6_addrs[j].addr_s);
+ ds_put_format(
+ match,
+ "nd_ns_mcast && ip6.dst == %s && nd.target == %s",
+ op->lsp_addrs[i].ipv6_addrs[j].sn_addr_s,
+ op->lsp_addrs[i].ipv6_addrs[j].addr_s);
ds_clear(actions);
ds_put_format(actions,
diff --git a/ovn-sb.xml b/ovn-sb.xml
index de0bd636fd..c11296d7c4 100644
--- a/ovn-sb.xml
+++ b/ovn-sb.xml
@@ -1146,6 +1146,7 @@
<ul>
<li><code>eth.bcast</code> expands to <code>eth.dst ==
ff:ff:ff:ff:ff:ff</code></li>
<li><code>eth.mcast</code> expands to <code>eth.dst[40]</code></li>
+ <li><code>eth.mcastv6</code> expands to <code>eth.dst[32..47] ==
0x3333</code></li>
<li><code>vlan.present</code> expands to <code>vlan.tci[12]</code></li>
<li><code>ip4</code> expands to <code>eth.type == 0x800</code></li>
<li><code>ip4.src_mcast</code> expands to
@@ -1161,8 +1162,10 @@
<li><code>ip.first_frag</code> expands to <code>ip.is_frag &&
!ip.later_frag</code></li>
<li><code>arp</code> expands to <code>eth.type == 0x806</code></li>
<li><code>rarp</code> expands to <code>eth.type == 0x8035</code></li>
+ <li><code>ip6.mcast</code> expands to <code>eth.mcastv6 &&
ip6.dst[120..127] == 0xff</code></li>
<li><code>nd</code> expands to <code>icmp6.type == {135, 136}
&& icmp6.code == 0 && ip.ttl == 255</code></li>
<li><code>nd_ns</code> expands to <code>icmp6.type == 135 &&
icmp6.code == 0 && ip.ttl == 255</code></li>
+ <li><code>nd_ns_mcast</code> expands to <code>ip6.mcast &&
icmp6.type == 135 && icmp6.code == 0 && ip.ttl ==
255</code></li>
<li><code>nd_na</code> expands to <code>icmp6.type == 136 &&
icmp6.code == 0 && ip.ttl == 255</code></li>
<li><code>nd_rs</code> expands to <code>icmp6.type == 133 &&
icmp6.code == 0 && ip.ttl == 255</code></li>
diff --git a/tests/ovn-northd.at b/tests/ovn-northd.at
index 3c49c0d43b..93ccbce6b0 100644
--- a/tests/ovn-northd.at
+++ b/tests/ovn-northd.at
@@ -9503,9 +9503,9 @@ AT_CAPTURE_FILE([S1flows])
AT_CHECK([grep -e "ls_in_arp_rsp" S1flows | ovn_strip_lflows], [0], [dnl
table=??(ls_in_arp_rsp ), priority=0 , match=(1), action=(next;)
table=??(ls_in_arp_rsp ), priority=100 , match=(arp.tpa ==
192.168.0.10 && arp.op == 1 && eth.dst == ff:ff:ff:ff:ff:ff && inport ==
"S1-vm1"), action=(next;)
- table=??(ls_in_arp_rsp ), priority=100 , match=(nd_ns && ip6.dst ==
{fd00::10, ff02::1:ff00:10} && nd.target == fd00::10 && inport == "S1-vm1"),
action=(next;)
+ table=??(ls_in_arp_rsp ), priority=100 , match=(nd_ns_mcast && ip6.dst
== ff02::1:ff00:10 && nd.target == fd00::10 && inport == "S1-vm1"),
action=(next;)
table=??(ls_in_arp_rsp ), priority=50 , match=(arp.tpa ==
192.168.0.10 && arp.op == 1 && eth.dst == ff:ff:ff:ff:ff:ff), action=(eth.dst =
eth.src; eth.src = 50:54:00:00:00:10; arp.op = 2; /* ARP reply */ arp.tha =
arp.sha; arp.sha = 50:54:00:00:00:10; arp.tpa = arp.spa; arp.spa =
192.168.0.10; outport = inport; flags.loopback = 1; output;)
- table=??(ls_in_arp_rsp ), priority=50 , match=(nd_ns && ip6.dst ==
{fd00::10, ff02::1:ff00:10} && nd.target == fd00::10), action=(nd_na { eth.src
= 50:54:00:00:00:10; ip6.src = fd00::10; nd.target = fd00::10; nd.tll =
50:54:00:00:00:10; outport = inport; flags.loopback = 1; output; };)
+ table=??(ls_in_arp_rsp ), priority=50 , match=(nd_ns_mcast && ip6.dst
== ff02::1:ff00:10 && nd.target == fd00::10), action=(nd_na { eth.src =
50:54:00:00:00:10; ip6.src = fd00::10; nd.target = fd00::10; nd.tll =
50:54:00:00:00:10; outport = inport; flags.loopback = 1; output; };)
])
#Set the disable_arp_nd_rsp option and verify the flow
diff --git a/tests/ovn.at b/tests/ovn.at
index a1d689e849..7583da7e07 100644
--- a/tests/ovn.at
+++ b/tests/ovn.at
@@ -8617,7 +8617,7 @@ done
# Complete Neighbor Solicitation packet and Neighbor Advertisement packet
# vif1 -> NS -> vif2. vif1 <- NA <- ovn-controller.
# vif2 will not receive NS packet, since ovn-controller will reply for it.
-ns_packet=3333ffa1f9aefa163e94059886dd6000000000203afffd81ce49a9480000f8163efffe940598fd81ce49a9480000f8163efffea1f9ae8700e01160000000fd81ce49a9480000f8163efffea1f9ae0101fa163e940598
+ns_packet=3333ffa1f9aefa163e94059886dd6000000000203afffd81ce49a9480000f8163efffe940598ff0200000000000000000001ffa1f9ae8700e01160000000fd81ce49a9480000f8163efffea1f9ae0101fa163e940598
na_packet=fa163e940598fa163ea1f9ae86dd6000000000203afffd81ce49a9480000f8163efffea1f9aefd81ce49a9480000f8163efffe9405988800e9ed60000000fd81ce49a9480000f8163efffea1f9ae0201fa163ea1f9ae
as hv1 ovs-appctl netdev-dummy/receive vif1 $ns_packet
@@ -14417,7 +14417,7 @@ test_ns_na() {
local inport=$1 src_mac=$2 dst_mac=$3 src_ip=$4 dst_ip=$5
packet=$(fmt_pkt "
- Ether(dst='ff:ff:ff:ff:ff:ff', src='${src_mac}') /
+ Ether(dst='33:33:ff:ff:ff:ff', src='${src_mac}') /
IPv6(src='${src_ip}', dst='ff02::1:ff00:2') /
ICMPv6ND_NS(tgt='${dst_ip}')
")
diff --git a/tests/system-ovn.at b/tests/system-ovn.at
index 6e4ec42473..e43244ca60 100644
--- a/tests/system-ovn.at
+++ b/tests/system-ovn.at
@@ -13899,3 +13899,126 @@ OVS_TRAFFIC_VSWITCHD_STOP(["/.*error receiving.*/d
/.*terminating with signal 15.*/d"])
AT_CLEANUP
])
+
+dnl This test sends IPv6 TCP packets between two lports of the same
+dnl logical switch and checks that the datapath flows don't match on
+dnl IPv6 source and destination addresses.
+OVN_FOR_EACH_NORTHD([
+AT_SETUP([ovn -- IPv6 switching - datapath flows])
+AT_KEYWORDS([IPv6])
+
+ovn_start
+OVS_TRAFFIC_VSWITCHD_START()
+ADD_BR([br-int])
+
+dnl Set external-ids in br-int needed for ovn-controller
+check ovs-vsctl \
+ -- set Open_vSwitch . external-ids:system-id=hv1 \
+ -- set Open_vSwitch .
external-ids:ovn-remote=unix:$ovs_base/ovn-sb/ovn-sb.sock \
+ -- set Open_vSwitch . external-ids:ovn-encap-type=geneve \
+ -- set Open_vSwitch . external-ids:ovn-encap-ip=169.0.0.1 \
+ -- set bridge br-int fail-mode=secure other-config:disable-in-band=true
+
+dnl Start ovn-controller
+start_daemon ovn-controller
+
+check ovn-nbctl ls-add sw0
+
+check ovn-nbctl lsp-add sw0 vm0
+check ovn-nbctl lsp-set-addresses vm0 "f0:00:0f:01:02:03 10.0.0.3 1000::3"
+
+check ovn-nbctl lsp-add sw0 vm1
+check ovn-nbctl lsp-set-addresses vm1 "f0:00:0f:01:02:04 10.0.0.4 1000::4"
+
+check ovn-nbctl --wait=hv sync
+
+ADD_NAMESPACES(vm0)
+ADD_VETH(vm0, vm0, br-int, "1000::3/64", "f0:00:0f:01:02:03", "1000::1",
"nodad")
+
+ADD_NAMESPACES(vm1)
+ADD_VETH(vm1, vm1, br-int, "1000::4/64", "f0:00:0f:01:02:04", "1000::1",
"nodad")
+
+dnl Checks the datapath flows and makes sure that there are no matches to
+dnl IPv6 src or dst fields.
+check_dp_flows() {
+ ipv6_src_dst_match=$1
+ dnl Dump the flows. Will be helpful while debugging.
+ ovs-appctl dpctl/dump-flows
+
+ eth_match1="eth(src=f0:00:0f:01:02:03,dst=f0:00:0f:01:02:04)"
+ eth_match2="eth(src=f0:00:0f:01:02:04,dst=f0:00:0f:01:02:03)"
+ ipv6_src_match="ipv6(src="
+ ipv6_dst_match="ipv6(dst="
+
+ AT_CHECK([ovs-appctl dpctl/dump-flows | grep "$eth_match1" -c], [0], [dnl
+2
+])
+
+ AT_CHECK([ovs-appctl dpctl/dump-flows | grep "$eth_match2" -c], [0], [dnl
+2
+])
+
+ if [[ "$ipv6_src_dst_match" == "yes" ]]; then
+ dnl Check that the dp flow for
eth(src=f0:00:0f:01:02:03,dst=f0:00:0f:01:02:04)
+ dnl matches on IPv6 src or dst.
+ AT_CHECK([ovs-appctl dpctl/dump-flows | grep "$eth_match1" | grep -e
"$ipv6_src_match" -e "$ipv6_dst_match" -c], [0], [dnl
+2
+])
+
+ dnl Check that the dp flow for
eth(src=f0:00:0f:01:02:04,dst=f0:00:0f:01:02:03)
+ dnl matches on IPv6 src or dst.
+ AT_CHECK([ovs-appctl dpctl/dump-flows | grep "$eth_match2" | grep -e
"$ipv6_src_match" -e "$ipv6_dst_match" -c], [0], [dnl
+2
+])
+ else
+ dnl Check that the dp flow for
eth(src=f0:00:0f:01:02:03,dst=f0:00:0f:01:02:04)
+ dnl doesn't match on IPv6 src or dst.
+ AT_CHECK([ovs-appctl dpctl/dump-flows | grep "$eth_match1" | grep
"$ipv6_src_match"], [1], [])
+ AT_CHECK([ovs-appctl dpctl/dump-flows | grep "$eth_match1" | grep
"$ipv6_dst_match"], [1], [])
+
+ dnl Check that the dp flow for
eth(src=f0:00:0f:01:02:04,dst=f0:00:0f:01:02:03)
+ AT_CHECK([ovs-appctl dpctl/dump-flows | grep "$eth_match2" | grep
"$ipv6_src_match"], [1], [])
+ AT_CHECK([ovs-appctl dpctl/dump-flows | grep "$eth_match2" | grep
"$ipv6_dst_match"], [1], [])
+ fi
+}
+
+NS_CHECK_EXEC([vm0], [ping6 -q -c 3 -i 0.3 -w 2 1000::4 | FORMAT_PING], \
+[0], [dnl
+3 packets transmitted, 3 received, 0% packet loss, time 0ms
+])
+
+# Start IPv6 TCP server on vm0.
+NETNS_DAEMONIZE([vm0], [nc -6 -l -k 1000::3 4242], [nc-vm1-1.pid])
+NS_CHECK_EXEC([vm1], [nc -6 1000::3 4242 -z], [0], [ignore], [ignore])
+
+check_dp_flows no
+
+# Now configure port security on vm0. dp flows should now match on IPv6
fields.
+check ovn-nbctl lsp-set-port-security vm0 "f0:00:0f:01:02:03 10.0.0.3 1000::3"
+check ovn-nbctl --wait=hv sync
+
+NS_CHECK_EXEC([vm0], [ping6 -q -c 3 -i 0.3 -w 2 1000::4 | FORMAT_PING], \
+[0], [dnl
+3 packets transmitted, 3 received, 0% packet loss, time 0ms
+])
+
+NS_CHECK_EXEC([vm1], [nc -6 1000::3 4242 -z], [0], [ignore], [ignore])
+check_dp_flows yes
+
+OVS_APP_EXIT_AND_WAIT([ovn-controller])
+
+as ovn-sb
+OVS_APP_EXIT_AND_WAIT([ovsdb-server])
+
+as ovn-nb
+OVS_APP_EXIT_AND_WAIT([ovsdb-server])
+
+as northd
+OVS_APP_EXIT_AND_WAIT([ovn-northd])
+
+as
+OVS_TRAFFIC_VSWITCHD_STOP(["/.*error receiving.*/d
+/failed to query port patch-.*/d
+/.*terminating with signal 15.*/d"])
+AT_CLEANUP
+])
--
2.45.2
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