[ovs-dev] [PATCH v6 ovn 2/2] northd: add logical flows for dhcpv6 pfd parsing

Lorenzo Bianconi lorenzo.bianconi at redhat.com
Tue Jan 14 11:07:14 UTC 2020


Introduce logical flows in ovn router pipeline in order to parse dhcpv6
advertise/reply from IPv6 prefix delegation router.
Do not overwrite ipv6_ra_pd_list info in options column of SB port_binding
table written by ovn-controller
Introduce ipv6_prefix column in NB Logical_router_port table to report
IPv6 prefix received from delegation router to the CMS

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi at redhat.com>
---
 northd/ovn-northd.c |  99 +++++++++++++++++++++++++++++++++-
 ovn-nb.ovsschema    |   5 +-
 ovn-nb.xml          |  22 ++++++++
 tests/atlocal.in    |   5 +-
 tests/system-ovn.at | 127 ++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 255 insertions(+), 3 deletions(-)

diff --git a/northd/ovn-northd.c b/northd/ovn-northd.c
index b6dc809d7..031792706 100644
--- a/northd/ovn-northd.c
+++ b/northd/ovn-northd.c
@@ -2645,6 +2645,41 @@ copy_gw_chassis_from_nbrp_to_sbpb(
     free(sb_ha_chassis);
 }
 
+static void
+ovn_port_update_ipv6_prefix(struct northd_context *ctx,
+                            const struct ovn_port *op,
+                            struct smap *sb_option)
+{
+    const char *ipv6_pd_list = smap_get(&op->sb->options, "ipv6_ra_pd_list");
+    if (!ipv6_pd_list) {
+        return;
+    }
+
+    smap_add(sb_option, "ipv6_ra_pd_list", ipv6_pd_list);
+
+    const struct nbrec_logical_router_port *lrp = NULL, *iter;
+    /* update logical_router_port table */
+    NBREC_LOGICAL_ROUTER_PORT_FOR_EACH (iter, ctx->ovnnb_idl) {
+        if (!strcmp(iter->name, op->sb->logical_port)) {
+            lrp = iter;
+            break;
+        }
+    }
+    if (!lrp) {
+        return;
+    }
+
+    struct sset ipv6_prefix_set = SSET_INITIALIZER(&ipv6_prefix_set);
+    sset_add_array(&ipv6_prefix_set, lrp->ipv6_prefix, lrp->n_ipv6_prefix);
+    if (!sset_contains(&ipv6_prefix_set, ipv6_pd_list)) {
+        sset_add(&ipv6_prefix_set, ipv6_pd_list);
+        nbrec_logical_router_port_set_ipv6_prefix(lrp,
+                sset_array(&ipv6_prefix_set),
+                sset_count(&ipv6_prefix_set));
+    }
+    sset_destroy(&ipv6_prefix_set);
+}
+
 static void
 ovn_port_update_sbrec(struct northd_context *ctx,
                       struct ovsdb_idl_index *sbrec_chassis_by_name,
@@ -2653,6 +2688,7 @@ ovn_port_update_sbrec(struct northd_context *ctx,
                       struct sset *active_ha_chassis_grps)
 {
     sbrec_port_binding_set_datapath(op->sb, op->od->sb);
+
     if (op->nbrp) {
         /* If the router is for l3 gateway, it resides on a chassis
          * and its port type is "l3gateway". */
@@ -2775,6 +2811,9 @@ ovn_port_update_sbrec(struct northd_context *ctx,
                 smap_add(&new, "l3gateway-chassis", chassis_name);
             }
         }
+
+        ovn_port_update_ipv6_prefix(ctx, op, &new);
+
         sbrec_port_binding_set_options(op->sb, &new);
         smap_destroy(&new);
 
@@ -2824,6 +2863,9 @@ ovn_port_update_sbrec(struct northd_context *ctx,
                 smap_add_format(&options,
                                 "qdisc_queue_id", "%d", queue_id);
             }
+
+            ovn_port_update_ipv6_prefix(ctx, op, &options);
+
             sbrec_port_binding_set_options(op->sb, &options);
             smap_destroy(&options);
             if (ovn_is_known_nb_lsp_type(op->nbsp->type)) {
@@ -2873,6 +2915,9 @@ ovn_port_update_sbrec(struct northd_context *ctx,
                 if (chassis) {
                     smap_add(&new, "l3gateway-chassis", chassis);
                 }
+
+                ovn_port_update_ipv6_prefix(ctx, op, &new);
+
                 sbrec_port_binding_set_options(op->sb, &new);
                 smap_destroy(&new);
             } else {
@@ -7129,6 +7174,11 @@ copy_ra_to_sb(struct ovn_port *op, const char *address_mode)
         }
         ds_put_format(&s, "%s/%u ", addrs->network_s, addrs->plen);
     }
+
+    const char *ra_pd_list = smap_get(&op->sb->options, "ipv6_ra_pd_list");
+    if (ra_pd_list) {
+        ds_put_cstr(&s, ra_pd_list);
+    }
     /* Remove trailing space */
     ds_chomp(&s, ' ');
     smap_add(&options, "ipv6_ra_prefixes", ds_cstr(&s));
@@ -7851,7 +7901,36 @@ build_lrouter_flows(struct hmap *datapaths, struct hmap *ports,
         free(snat_ips);
     }
 
-    /* Logical router ingress table 3: IP Input for IPv6. */
+    /* DHCPv6 reply handling */
+    HMAP_FOR_EACH (op, key_node, ports) {
+        if (!op->nbrp) {
+            continue;
+        }
+
+        if (op->derived) {
+            continue;
+        }
+
+        struct lport_addresses lrp_networks;
+        if (!extract_lrp_networks(op->nbrp, &lrp_networks)) {
+            continue;
+        }
+
+        for (size_t i = 0; i < lrp_networks.n_ipv6_addrs; i++) {
+            ds_clear(&actions);
+            ds_clear(&match);
+            ds_put_format(&match, "ip6.dst == %s && udp.src == 547 &&"
+                          " udp.dst == 546",
+                          lrp_networks.ipv6_addrs[i].addr_s);
+            ds_put_format(&actions, "reg0 = 0; handle_dhcpv6_reply { "
+                          "eth.dst <-> eth.src; ip6.dst <-> ip6.src; "
+                          "outport <-> inport; output; };");
+            ovn_lflow_add(lflows, op->od, S_ROUTER_IN_IP_INPUT, 100,
+                          ds_cstr(&match), ds_cstr(&actions));
+        }
+    }
+
+    /* Logical router ingress table 1: IP Input for IPv6. */
     HMAP_FOR_EACH (op, key_node, ports) {
         if (!op->nbrp) {
             continue;
@@ -8652,6 +8731,24 @@ build_lrouter_flows(struct hmap *datapaths, struct hmap *ports,
             continue;
         }
 
+        struct smap options;
+        /* enable IPv6 prefix delegation */
+        bool prefix_delegation = smap_get_bool(&op->nbrp->options,
+                                               "prefix_delegation", false);
+        if (prefix_delegation) {
+            smap_clone(&options, &op->sb->options);
+            smap_add(&options, "ipv6_prefix_delegation", "true");
+            sbrec_port_binding_set_options(op->sb, &options);
+            smap_destroy(&options);
+        }
+
+        if (smap_get_bool(&op->nbrp->options, "prefix", false)) {
+            smap_clone(&options, &op->sb->options);
+            smap_add(&options, "ipv6_prefix", "true");
+            sbrec_port_binding_set_options(op->sb, &options);
+            smap_destroy(&options);
+        }
+
         const char *address_mode = smap_get(
             &op->nbrp->ipv6_ra_configs, "address_mode");
 
diff --git a/ovn-nb.ovsschema b/ovn-nb.ovsschema
index 12999a466..8e9d1517f 100644
--- a/ovn-nb.ovsschema
+++ b/ovn-nb.ovsschema
@@ -1,7 +1,7 @@
 {
     "name": "OVN_Northbound",
     "version": "5.18.0",
-    "cksum": "2806349485 24196",
+    "cksum": "4171338172 24362",
     "tables": {
         "NB_Global": {
             "columns": {
@@ -324,6 +324,9 @@
                 "ipv6_ra_configs": {
                     "type": {"key": "string", "value": "string",
                              "min": 0, "max": "unlimited"}},
+                "ipv6_prefix": {"type": {"key": "string",
+                                      "min": 0,
+                                      "max": "unlimited"}},
                 "external_ids": {
                     "type": {"key": "string", "value": "string",
                              "min": 0, "max": "unlimited"}}},
diff --git a/ovn-nb.xml b/ovn-nb.xml
index 5ae52bbde..55faca3b1 100644
--- a/ovn-nb.xml
+++ b/ovn-nb.xml
@@ -1896,6 +1896,11 @@
       port has all ingress and egress traffic dropped.
     </column>
 
+    <column name="ipv6_prefix">
+       This column contains IPv6 prefix obtained by prefix delegation
+       router according to RFC 3633
+    </column>
+
     <group title="ipv6_ra_configs">
       <p>
         This column defines the IPv6 ND RA address mode and ND MTU Option to be
@@ -2142,6 +2147,23 @@
           to <code>true</code>.
         </p>
       </column>
+
+      <column name="options" key="prefix_delegation"
+              type='{"type": "boolean"}'>
+        <p>
+          If set to <code>true</code>, enable IPv6 prefix delegation state
+          machine on this logical router port (RFC3633). IPv6 prefix
+          delegation is available just on a gateway router or on a gateway
+          router port.
+        </p>
+      </column>
+
+      <column name="options" key="prefix" type='{"type": "boolean"}'>
+        <p>
+          If set to <code>true</code>, this interface will receive an IPv6
+          prefix according to RFC3663
+        </p>
+      </column>
     </group>
 
     <group title="Attachment">
diff --git a/tests/atlocal.in b/tests/atlocal.in
index 5f14c3da0..8f3ff03b9 100644
--- a/tests/atlocal.in
+++ b/tests/atlocal.in
@@ -157,7 +157,7 @@ find_command()
 {
     which $1 > /dev/null 2>&1
     status=$?
-    var=HAVE_`echo "$1" | tr '[a-z]' '[A-Z]'`
+    var=HAVE_`echo "$1" | tr '-' '_' | tr '[a-z]' '[A-Z]'`
     if test "$status" = "0"; then
         eval ${var}="yes"
     else
@@ -192,6 +192,9 @@ else
     DIFF_SUPPORTS_NORMAL_FORMAT=no
 fi
 
+# Set HAVE_DIBBLER-SERVER
+find_command dibbler-server
+
 # Turn off proxies.
 unset http_proxy
 unset https_proxy
diff --git a/tests/system-ovn.at b/tests/system-ovn.at
index a56d358ea..bb7d8e420 100644
--- a/tests/system-ovn.at
+++ b/tests/system-ovn.at
@@ -3426,3 +3426,130 @@ OVS_TRAFFIC_VSWITCHD_STOP(["/failed to query port patch-.*/d
 /connection dropped.*/d"])
 
 AT_CLEANUP
+
+AT_SETUP([ovn -- IPv6 prefix delegation])
+AT_SKIP_IF([test $HAVE_DIBBLER_SERVER = no])
+AT_KEYWORDS([ovn-ipv6-prefix_d])
+
+ovn_start
+OVS_TRAFFIC_VSWITCHD_START()
+
+ADD_BR([br-int])
+ADD_BR([br-ext])
+
+ovs-ofctl add-flow br-ext action=normal
+# Set external-ids in br-int needed for ovn-controller
+ovs-vsctl \
+        -- set Open_vSwitch . external-ids:system-id=hv1 \
+        -- set Open_vSwitch . external-ids:ovn-remote=unix:$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
+
+# Start ovn-controller
+start_daemon ovn-controller
+
+ovn-nbctl lr-add R1
+
+ovn-nbctl ls-add sw0
+ovn-nbctl ls-add sw1
+ovn-nbctl ls-add public
+
+ovn-nbctl lrp-add R1 rp-sw0 00:00:01:01:02:03 192.168.1.1/24
+ovn-nbctl lrp-add R1 rp-sw1 00:00:03:01:02:03 192.168.2.1/24
+ovn-nbctl lrp-add R1 rp-public 00:00:02:01:02:03 172.16.1.1/24 \
+    -- set Logical_Router_Port rp-public options:redirect-chassis=hv1
+
+ovn-nbctl lsp-add sw0 sw0-rp -- set Logical_Switch_Port sw0-rp \
+    type=router options:router-port=rp-sw0 \
+    -- lsp-set-addresses sw0-rp router
+ovn-nbctl lsp-add sw1 sw1-rp -- set Logical_Switch_Port sw1-rp \
+    type=router options:router-port=rp-sw1 \
+    -- lsp-set-addresses sw1-rp router
+
+ovn-nbctl lsp-add public public-rp -- set Logical_Switch_Port public-rp \
+    type=router options:router-port=rp-public \
+    -- lsp-set-addresses public-rp router
+
+ADD_NAMESPACES(sw01)
+ADD_VETH(sw01, sw01, br-int, "192.168.1.2/24", "f0:00:00:01:02:03", \
+         "192.168.1.1")
+ovn-nbctl lsp-add sw0 sw01 \
+    -- lsp-set-addresses sw01 "f0:00:00:01:02:03 192.168.1.2"
+
+ADD_NAMESPACES(sw11)
+ADD_VETH(sw11, sw11, br-int, "192.168.2.2/24", "f0:00:00:02:02:03", \
+         "192.168.2.1")
+ovn-nbctl lsp-add sw1 sw11 \
+    -- lsp-set-addresses sw11 "f0:00:00:02:02:03 192.168.2.2"
+
+ADD_NAMESPACES(server)
+ADD_VETH(s1, server, br-ext, "2001:db8:3333::2/64", "f0:00:00:01:02:05", \
+         "2001:db8:3333::1")
+
+OVS_WAIT_UNTIL([test "$(ip netns exec server ip a | grep 2001:db8:3333::2 | grep tentative)" = ""])
+OVS_WAIT_UNTIL([test "$(ip netns exec server ip a | grep fe80 | grep tentative)" = ""])
+
+AT_CHECK([ovs-vsctl set Open_vSwitch . external-ids:ovn-bridge-mappings=phynet:br-ext])
+ovn-nbctl lsp-add public public1 \
+        -- lsp-set-addresses public1 unknown \
+        -- lsp-set-type public1 localnet \
+        -- lsp-set-options public1 network_name=phynet
+
+ovn-nbctl set logical_router_port rp-public options:prefix_delegation=true
+ovn-nbctl set logical_router_port rp-public options:prefix=true
+ovn-nbctl set logical_router_port rp-sw0 options:prefix=true
+ovn-nbctl set logical_router_port rp-sw1 options:prefix=true
+
+# reset dibbler state
+sed s/eth0/s1/g -i /etc/dibbler/server.conf
+cat > /var/lib/dibbler/server-AddrMgr.xml <<EOF
+<AddrMgr>
+  <timestamp>1575481348</timestamp>
+  <replayDetection>0</replayDetection>
+</AddrMgr>
+EOF
+cat > /var/lib/dibbler/server-CfgMgr.xml <<EOF
+<SrvCfgMgr>
+  <workDir>/var/lib/dibbler</workDir>
+  <LogName>Server</LogName>
+  <LogLevel>8</LogLevel>
+  <InactiveMode>0</InactiveMode>
+  <GuessMode>0</GuessMode>
+</SrvCfgMgr>
+EOF
+
+NS_CHECK_EXEC([server], [dibbler-server run > dibbler.log &])
+ovn-nbctl --wait=hv sync
+
+sleep 10
+kill $(pidof dibbler-server)
+
+OVS_WAIT_UNTIL([ovn-nbctl list logical_router_port rp-public | grep ipv6_prefix])
+OVS_WAIT_UNTIL([ovn-nbctl list logical_router_port rp-sw0 | grep ipv6_prefix])
+OVS_WAIT_UNTIL([ovn-nbctl list logical_router_port rp-sw1 | grep ipv6_prefix])
+AT_CHECK([ovn-nbctl get logical_router_port rp-public ipv6_prefix], [0], [dnl
+[["2001:db8:3333::6a2f:0:0/96"]]
+])
+AT_CHECK([ovn-nbctl get logical_router_port rp-sw0 ipv6_prefix], [0], [dnl
+[["2001:db8:3333::5b81:0:0/96"]]
+])
+AT_CHECK([ovn-nbctl get logical_router_port rp-sw1 ipv6_prefix], [0], [dnl
+[["2001:db8:3333::42f1:0:0/96"]]
+])
+
+kill $(pidof 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
+/.*terminating with signal 15.*/d"])
+AT_CLEANUP
-- 
2.21.1



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