This patch tries to implement Router Advertisement (RA) responder for SLAAC
on ovn-northd side.
It tries to build lflows per each Logical Router Port, who have IPv6 networks
and set their 'slaac' column to true.
The lflows will look like:
match=(inport == "lrp-32a71e0b-8b19-4c52-8cde-058325e4df5d" &&
ip6.dst == ff02::2 && nd_rs)
action=(nd_ra{slaac(fd80:a123:b345::/64,1450,fa:16:3e:62:f1:e6);
outport = inport; flags.loopback = 1; output;};)
while:
- nd_rs is a new symbol stands for
"icmp6.type == 133 && icmp6.code == 0 && ttl == 255"
- slaac is a new action which accepts ordered parameter list:
- one or more IPv6 prefixes: such as fd80:a123:b345::/64.
- MTU: logical switch MTU, such as 1450.
- MAC address: router port mac address, such as fa:16:3e:62:f1:e6.
- nd_ra is a new action which stands for RA responder, it will compose a RA
packet per parameters in slaac, and eth.src and ip6.src from packet being
processed.
Logical_Router_Port.slaac column will only tell whether ovn should reply a RA
packet for Router solicitation packet received from the lrp port. To respond
a RA packet for other scenario will be a future work.
---
ovn/northd/ovn-northd.c | 94 ++++++++++++++++++++++++++++++++++++----
ovn/ovn-nb.ovsschema | 6 ++-
ovn/ovn-nb.xml | 11 +++++
tests/ovn.at | 111 ++++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 213 insertions(+), 9 deletions(-)
diff --git a/ovn/northd/ovn-northd.c b/ovn/northd/ovn-northd.c
index d6c14cf..98db819 100644
--- a/ovn/northd/ovn-northd.c
+++ b/ovn/northd/ovn-northd.c
@@ -126,9 +126,10 @@ enum ovn_stage {
PIPELINE_STAGE(ROUTER, IN, IP_INPUT, 1, "lr_in_ip_input") \
PIPELINE_STAGE(ROUTER, IN, UNSNAT, 2, "lr_in_unsnat") \
PIPELINE_STAGE(ROUTER, IN, DNAT, 3, "lr_in_dnat") \
- PIPELINE_STAGE(ROUTER, IN, IP_ROUTING, 4, "lr_in_ip_routing") \
- PIPELINE_STAGE(ROUTER, IN, ARP_RESOLVE, 5, "lr_in_arp_resolve") \
- PIPELINE_STAGE(ROUTER, IN, ARP_REQUEST, 6, "lr_in_arp_request") \
+ PIPELINE_STAGE(ROUTER, IN, RA_RSP, 4, "lr_in_ra_rsp") \
+ PIPELINE_STAGE(ROUTER, IN, IP_ROUTING, 5, "lr_in_ip_routing") \
+ PIPELINE_STAGE(ROUTER, IN, ARP_RESOLVE, 6, "lr_in_arp_resolve") \
+ PIPELINE_STAGE(ROUTER, IN, ARP_REQUEST, 7, "lr_in_arp_request") \
\
/* Logical router egress stages. */ \
PIPELINE_STAGE(ROUTER, OUT, SNAT, 0, "lr_out_snat") \
@@ -2413,13 +2414,20 @@ build_lswitch_flows(struct hmap *datapaths, struct hmap
*ports,
}
}
- /* Ingress table 1 and 2: Port security - IP and ND, by default goto next.
- * (priority 0)*/
+ /* Ingress table 1 and 2: Port security - IP and ND. */
HMAP_FOR_EACH (od, key_node, datapaths) {
if (!od->nbs) {
continue;
}
+ /* Allow Router Solicitation and Router Advertisement messages pass.
+ * (priority 90)*/
+ ovn_lflow_add(lflows, od, S_SWITCH_IN_PORT_SEC_ND, 90, "nd_rs",
+ "next;");
+ ovn_lflow_add(lflows, od, S_SWITCH_IN_PORT_SEC_ND, 90, "nd_ra",
+ "next;");
+
+ /* By default goto next. (priority 0)*/
ovn_lflow_add(lflows, od, S_SWITCH_IN_PORT_SEC_ND, 0, "1", "next;");
ovn_lflow_add(lflows, od, S_SWITCH_IN_PORT_SEC_IP, 0, "1", "next;");
}
@@ -2582,6 +2590,32 @@ build_lswitch_flows(struct hmap *datapaths, struct hmap
*ports,
ovn_lflow_add(lflows, od, S_SWITCH_IN_DHCP_RESPONSE, 0, "1", "next;");
}
+ /* Ingress table 12: Destination lookup, router solicitation handling
+ * (priority 110). */
+ HMAP_FOR_EACH (od, key_node, datapaths) {
+ if (!od->nbs) {
+ continue;
+ }
+
+ if (!od->n_router_ports) {
+ continue;
+ }
+
+ ds_clear(&actions);
+ for (size_t i = 0; i != od->n_router_ports; i++) {
+ op = od->router_ports[i];
+ if (!op->lsp_addrs || !op->lsp_addrs->n_ipv6_addrs) {
+ continue;
+ }
+ ds_put_format(&actions, "outport = %s; output; ", op->json_key);
+ }
+ if (actions.length != 0) {
+ ds_chomp(&actions, ' ');
+ ovn_lflow_add(lflows, od, S_SWITCH_IN_L2_LKUP, 110, "nd_rs",
+ ds_cstr(&actions));
+ }
+ }
+
/* Ingress table 12: Destination lookup, broadcast and multicast handling
* (priority 100). */
HMAP_FOR_EACH (op, key_node, ports) {
@@ -3409,7 +3443,51 @@ build_lrouter_flows(struct hmap *datapaths, struct hmap
*ports,
"ip", "flags.loopback = 1; ct_dnat;");
}
- /* Logical router ingress table 4: IP Routing.
+ /* Logical router ingress table 5: RA responder, by default goto next.
+ * (priority 0)*/
+ HMAP_FOR_EACH (od, key_node, datapaths) {
+ if (!od->nbr) {
+ continue;
+ }
+
+ ovn_lflow_add(lflows, od, S_ROUTER_IN_RA_RSP, 0, "1", "next;");
+ }
+
+ /* Logical router ingress table 5: RA responder, reply for 'slaac' enabled
+ * router port. (priority 50)*/
+ HMAP_FOR_EACH (op, key_node, ports) {
+ if (!op->nbrp || op->nbrp->peer
+ || !op->peer
+ || !op->nbrp->slaac
+ || !*op->nbrp->slaac) {
+ continue;
+ }
+
+ ds_clear(&match);
+ ds_put_format(&match, "inport == %s", op->json_key);
+ ds_put_cstr(&match, " && ip6.dst == ff02::2 && nd_rs");
+ ds_clear(&actions);
+ ds_put_format(&actions, "nd_ra{slaac(");
+ size_t actions_len = actions.length;
+ for (size_t i = 0; i != op->lrp_networks.n_ipv6_addrs; i++) {
+ if (in6_is_lla(&op->lrp_networks.ipv6_addrs[i].network)) {
+ continue;
+ }
+ ds_put_format(&actions, "%s/%u,",
+ op->lrp_networks.ipv6_addrs[i].network_s,
+ op->lrp_networks.ipv6_addrs[i].plen);
+ }
+ if (actions.length != actions_len) {
+ ds_put_format(&actions, "%ld,", op->peer->od->nbs->mtu);
+ ds_put_cstr(&actions, op->lrp_networks.ea_s);
+ ds_put_cstr(&actions, "); outport = inport; flags.loopback = 1;"
+ " output;};");
+ ovn_lflow_add(lflows, op->od, S_ROUTER_IN_RA_RSP, 50,
+ ds_cstr(&match), ds_cstr(&actions));
+ }
+ }
+
+ /* Logical router ingress table 5: IP Routing.
*
* A packet that arrives at this table is an IP packet that should be
* routed to the address in 'ip[46].dst'. This table sets outport to
@@ -3451,7 +3529,7 @@ build_lrouter_flows(struct hmap *datapaths, struct hmap
*ports,
/* XXX destination unreachable */
- /* Local router ingress table 5: ARP Resolution.
+ /* Local router ingress table 6: ARP Resolution.
*
* Any packet that reaches this table is an IP packet whose next-hop IP
* address is in reg0. (ip4.dst is the final destination.) This table
@@ -3648,7 +3726,7 @@ build_lrouter_flows(struct hmap *datapaths, struct hmap
*ports,
"get_nd(outport, xxreg0); next;");
}
- /* Local router ingress table 6: ARP request.
+ /* Local router ingress table 7: ARP request.
*
* In the common case where the Ethernet destination has been resolved,
* this table outputs the packet (priority 0). Otherwise, it composes
diff --git a/ovn/ovn-nb.ovsschema b/ovn/ovn-nb.ovsschema
index 660db76..f4d57a1 100644
--- a/ovn/ovn-nb.ovsschema
+++ b/ovn/ovn-nb.ovsschema
@@ -1,7 +1,7 @@
{
"name": "OVN_Northbound",
"version": "5.3.0",
- "cksum": "1305504870 9051",
+ "cksum": "2595190831 9309",
"tables": {
"NB_Global": {
"columns": {
@@ -34,6 +34,9 @@
"other_config": {
"type": {"key": "string", "value": "string",
"min": 0, "max": "unlimited"}},
+ "mtu": {"type": {"key": {"type": "integer",
+ "minInteger": 0,
+ "maxInteger": 65535}}},
"external_ids": {
"type": {"key": "string", "value": "string",
"min": 0, "max": "unlimited"}}},
@@ -150,6 +153,7 @@
"mac": {"type": "string"},
"peer": {"type": {"key": "string", "min": 0, "max": 1}},
"enabled": {"type": {"key": "boolean", "min": 0, "max": 1}},
+ "slaac": {"type": {"key": "boolean", "min": 0, "max": 1}},
"external_ids": {
"type": {"key": "string", "value": "string",
"min": 0, "max": "unlimited"}}},
diff --git a/ovn/ovn-nb.xml b/ovn/ovn-nb.xml
index 4ce295a..18895a0 100644
--- a/ovn/ovn-nb.xml
+++ b/ovn/ovn-nb.xml
@@ -134,6 +134,10 @@
</column>
</group>
+ <column name="mtu">
+ Logical Switch MTU.
+ </column>
+
<group title="Common Columns">
<column name="external_ids">
See <em>External IDs</em> at the beginning of this document.
@@ -904,6 +908,13 @@
port has all ingress and egress traffic dropped.
</column>
+ <column name="slaac">
+ Setting <code>true</code> specifies the logical switch subnets behind
+ this router port IPv6 networks are going to use SLAAC as IPv6 address
+ configuration and RA mode. Otherwise set this column to
+ <code>false</code>, or this router port has no IPv6 networks.
+ </column>
+
<group title="Attachment">
<p>
A given router port serves one of two purposes:
diff --git a/tests/ovn.at b/tests/ovn.at
index 454cb24..ffca833 100644
--- a/tests/ovn.at
+++ b/tests/ovn.at
@@ -4029,3 +4029,114 @@ AT_CHECK([cat received2.packets], [0], [expout])
OVN_CLEANUP([hv1])
AT_CLEANUP
+
+AT_SETUP([ovn -- ipv6 stateless address autoconfiguration])
+AT_KEYWORDS([ovn-slaac])
+AT_SKIP_IF([test $HAVE_PYTHON = no])
+ovn_start
+
+# In this test case we create 1 lswitch with 2 VIF ports attached
+# with. Router solicitation packet we test, sent from VIF port, will be replied
+# by local ovn-controller.
+
+# Create hypervisors and logical switch lsw0, logical router lr0, attach lsw0
+# onto lr0, set Logical_Router_Port.slaac column to 'true' to allow lrp0 send
+# RA with SLAAC flags.
+ovn-nbctl ls-add lsw0
+ovn-nbctl set logical-switch lsw0 mtu=1450
+ovn-nbctl lr-add lr0
+ovn-nbctl lrp-add lr0 lrp0 fa:16:3e:32:3c:e0 fdad:a0f9:a012::1/64
+ovn-nbctl set Logical_Router_Port lrp0 slaac="true"
+ovn-nbctl \
+ -- lsp-add lsw0 lsp0 \
+ -- set Logical_Switch_Port lsp0 type=router \
+ options:router-port=lrp0 \
+ addresses='"fa:16:3e:32:3c:e0 fdad:a0f9:a012::1"'
+net_add n1
+sim_add hv1
+as hv1
+ovs-vsctl add-br br-phys
+ovn_attach n1 br-phys 192.168.0.2
+
+# Add vif1 to hv1 and lsw0, turn on l2 port security on vif1.
+ovs-vsctl add-port br-int vif1 -- set Interface vif1 external-ids:iface-id=lp1
options:tx_pcap=hv1/vif1-tx.pcap options:rxq_pcap=hv1/vif1-rx.pcap
ofport-request=1
+ovn-nbctl lsp-add lsw0 lp1
+ovn-nbctl lsp-set-addresses lp1 "fa:16:3e:6e:a1:42 10.0.0.12
fdad:a0f9:a012:0:f816:3eff:fe6e:a142"
+ovn-nbctl lsp-set-port-security lp1 "fa:16:3e:6e:a1:42 10.0.0.12
fdad:a0f9:a012:0:f816:3eff:fe6e:a142"
+
+# Add vif2 to hv1 and lsw0, turn on l2 port security on vif2.
+ovs-vsctl add-port br-int vif2 -- set Interface vif2 external-ids:iface-id=lp2
options:tx_pcap=hv1/vif2-tx.pcap options:rxq_pcap=hv1/vif2-rx.pcap
ofport-request=2
+ovn-nbctl lsp-add lsw0 lp2
+ovn-nbctl lsp-set-addresses lp2 "fa:16:3e:6e:b2:55 10.0.0.13
fdad:a0f9:a012:0:f816:3eff:fe6e:b255"
+ovn-nbctl lsp-set-port-security lp2 "fa:16:3e:6e:b2:55 10.0.0.13
fdad:a0f9:a012:0:f816:3eff:fe6e:b255"
+
+# Add ACL rule for ICMPv6 on lsw0
+ovn-nbctl acl-add lsw0 from-lport 1002 'ip6 && icmp6' allow-related
+ovn-nbctl acl-add lsw0 to-lport 1002 'outport == "lp1" && ip6 && icmp6'
allow-related
+ovn-nbctl acl-add lsw0 to-lport 1002 'outport == "lp2" && ip6 && icmp6'
allow-related
+
+# Allow some time for ovn-northd and ovn-controller to catch up.
+# XXX This should be more systematic.
+sleep 1
+
+# Given the name of a logical port, prints the name of the hypervisor
+# on which it is located.
+vif_to_hv() {
+ echo hv1${1%?}
+}
+trim_zeros() {
+ sed 's/\(00\)\{1,\}$//'
+}
+for i in 1 2; do
+ : > $i.expected
+done
+
+# Complete Router Solicitation packet and Router Advertisement packet.
+rs_packet=333300000002fa163e6ea14286dd6000000000103afffe80000000000000f8163efffe6ea142ff0200000000000000000000000000028500cb9e000000000101fa163e6ea142
+packet_l2=fa163e6ea142fa163e323ce086dd
+packet_l3=6000000000403afffe80000000000000f8163efffe323ce0fe80000000000000f8163efffe6ea142
+packet_l4_hd_no_csum=860040002a300000000000000000
+prefix_opt=030440c000002a3000002a3000000000fdada0f9a01200000000000000000000
+mtu_opt=05010000000005aa
+sll_opt=0101fa163e323ce0
+ra_packet=$packet_l2$packet_l3$packet_l4_hd_no_csum$prefix_opt$mtu_opt$sll_opt
+
+as hv1 ovs-appctl netdev-dummy/receive vif1 $rs_packet
+echo $ra_packet | trim_zeros >> 1.expected
+
+sleep 1
+
+# Extend lrp0 networks, update lp2 addresses and l2 port security.
+ovn-nbctl add Logical_Router_Port lrp0 networks \"fdad:b123:d789::1/64\"
+ovn-nbctl set Logical_Switch_Port lp2 addresses \"fa:16:3e:6e:b2:55 10.0.0.13
fdad:a0f9:a012:0:f816:3eff:fe6e:b255 fdad:b123:d789:0:f816:3eff:fe6e:b255\"
+ovn-nbctl set Logical_Switch_Port lp2 port-security \"fa:16:3e:6e:b2:55
10.0.0.13 fdad:a0f9:a012:0:f816:3eff:fe6e:b255
fdad:b123:d789:0:f816:3eff:fe6e:b255\"
+# Update Router solicitation packet for lp2.
+rs_packet=333300000002fa163e6eb25586dd6000000000103afffe80000000000000f8163efffe6eb255ff0200000000000000000000000000028500cb9e000000000101fa163e6eb255
+# Router Advertisement packet should have a new prefix information option.
+packet_l2=fa163e6eb255fa163e323ce086dd
+packet_l3=6000000000603afffe80000000000000f8163efffe323ce0fe80000000000000f8163efffe6eb255
+new_prefix_opt=030440c000002a3000002a3000000000fdadb123d78900000000000000000000
+ra_packet=$packet_l2$packet_l3$packet_l4_hd_no_csum$prefix_opt$new_prefix_opt$mtu_opt$sll_opt
+
+as hv1 ovs-appctl netdev-dummy/receive vif2 $rs_packet
+echo $ra_packet | trim_zeros >> 2.expected
+
+sleep 1
+
+echo "------ hv1 dump ------"
+as hv1 ovs-vsctl show
+as hv1 ovs-ofctl -O OpenFlow13 show br-int
+as hv1 ovs-ofctl -O OpenFlow13 dump-flows br-int
+
+for i in 1 2; do
+ file=hv1/vif$i-tx.pcap
+ echo $file
+ # Remove checksum to compare.
+ $PYTHON "$top_srcdir/utilities/ovs-pcap.in" $file | trim_zeros | cut -b
1-112,117- > $i.packets
+ cat $i.expected > expout
+ AT_CHECK([cat $i.packets], [0], [expout])
+done
+
+OVN_CLEANUP([hv1])
+
+AT_CLEANUP
--
1.9.1
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