vrrpd: autoconfig support

Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>

lib/if.h

@@ -225,6 +225,10 @@ struct interface {
 	   not work as expected.
 	 */
 	ifindex_t ifindex;
+	/*
+	 * ifindex of parent interface, if any
+	 */
+	ifindex_t link_ifindex;
 #define IFINDEX_INTERNAL	0
 
 	/* Zebra internal interface status */

lib/zclient.c

@@ -1400,6 +1400,8 @@ stream_failure:
  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  * |  bandwidth                                                    |
  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |  parent ifindex                                               |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  * |  Link Layer Type                                              |
  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  * |  Harware Address Length                                       |
@@ -1580,6 +1582,7 @@ void zebra_interface_if_set_value(struct stream *s, struct interface *ifp)
 	ifp->mtu = stream_getl(s);
 	ifp->mtu6 = stream_getl(s);
 	ifp->bandwidth = stream_getl(s);
+	ifp->link_ifindex = stream_getl(s);
 	ifp->ll_type = stream_getl(s);
 	ifp->hw_addr_len = stream_getl(s);
 	if (ifp->hw_addr_len)

vrrpd/vrrp.c

@@ -1297,6 +1297,81 @@ int vrrp_event(struct vrrp_router *r, int event)
 
 /* Other ------------------------------------------------------------------- */
 
+static struct vrrp_vrouter *
+vrrp_autoconfig_autocreate(struct interface *mvl_ifp)
+{
+	struct interface *p;
+	struct vrrp_vrouter *vr;
+
+	p = if_lookup_by_index(mvl_ifp->link_ifindex, VRF_DEFAULT);
+	uint8_t vrid = mvl_ifp->hw_addr[5];
+
+	zlog_info(VRRP_LOGPFX "Autoconfiguring VRRP on %s", p->name);
+
+	/* If it already exists, skip it */
+	vr = vrrp_lookup(p, vrid);
+	if (vr) {
+		zlog_info(VRRP_LOGPFX "VRRP instance %" PRIu8
+				      "already configured on %s",
+			  vrid, p->name);
+		return vr;
+	}
+
+	/* create a new one */
+	vr = vrrp_vrouter_create(p, vrid, vrrp_autoconfig_version);
+
+	if (!vr)
+		return NULL;
+
+	/* add connected addresses as vips */
+	struct listnode *ln;
+	struct connected *c = NULL;
+	for (ALL_LIST_ELEMENTS_RO(mvl_ifp->connected, ln, c))
+		if (c->address->family == AF_INET)
+			vrrp_add_ipv4(vr, c->address->u.prefix4, false);
+		else if (c->address->family == AF_INET6) {
+			if (!IN6_IS_ADDR_LINKLOCAL(&c->address->u.prefix6))
+				vrrp_add_ipv6(vr, c->address->u.prefix6, false);
+		}
+
+	if (vr->v4->addrs->count)
+		vrrp_event(vr->v4, VRRP_EVENT_STARTUP);
+	if (vr->v6->addrs->count)
+		vrrp_event(vr->v6, VRRP_EVENT_STARTUP);
+
+	vr->autoconf = true;
+
+	return vr;
+}
+
+static bool vrrp_ifp_is_mvl(struct interface *ifp)
+{
+	struct ethaddr vmac4;
+	struct ethaddr vmac6;
+	vrrp_mac_set(&vmac4, 0, 0x00);
+	vrrp_mac_set(&vmac6, 1, 0x00);
+
+	return !memcmp(ifp->hw_addr, vmac4.octet, sizeof(vmac4.octet) - 1)
+	       || !memcmp(ifp->hw_addr, vmac6.octet, sizeof(vmac6.octet) - 1);
+}
+
+int vrrp_autoconfig(struct interface *ifp)
+{
+	if (ifp && vrrp_ifp_is_mvl(ifp)) {
+		vrrp_autoconfig_autocreate(ifp);
+		return 0;
+	}
+
+	/* Loop through interfaces, looking for compatible macvlan devices. */
+	struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT);
+
+	FOR_ALL_INTERFACES (vrf, ifp)
+		if (vrrp_ifp_is_mvl(ifp))
+			vrrp_autoconfig_autocreate(ifp);
+
+	return 0;
+}
+
 static unsigned int vrrp_hash_key(void *arg)
 {
 	struct vrrp_vrouter *vr = arg;
@@ -1323,6 +1398,7 @@ static bool vrrp_hash_cmp(const void *arg1, const void *arg2)
 
 void vrrp_init(void)
 {
+	vrrp_autoconfig_version = 3;
 	vrrp_vrouters_hash = hash_create(&vrrp_hash_key, vrrp_hash_cmp,
 					 "VRRP virtual router hash");
 	vrf_init(NULL, NULL, NULL, NULL, NULL);

vrrpd/vrrp.h

@@ -53,13 +53,17 @@ extern struct zebra_privs_t vrrp_privs;
 /* Global hash of all Virtual Routers */
 struct hash *vrrp_vrouters_hash;
 
-/*
+/* Whether to automatically configure VRRP instances */
- * VRRP Router.
+static bool vrrp_autoconfig_on;
- *
+static int vrrp_autoconfig_version;
- * This struct contains all state for a particular VRRP Router operating in a
+
- * Virtual Router for either IPv4 or IPv6.
+	/*
- */
+	 * VRRP Router.
-struct vrrp_router {
+	 *
+	 * This struct contains all state for a particular VRRP Router operating
+	 * in a Virtual Router for either IPv4 or IPv6.
+	 */
+	struct vrrp_router {
 	/*
 	 * Whether this VRRP Router is active.
 	 */
@@ -164,6 +168,9 @@ struct vrrp_router {
  * implementations.
  */
 struct vrrp_vrouter {
+	/* Whether this instance was automatically configured */
+	bool autoconf;
+
 	/* Interface */
 	struct interface *ifp;
 
@@ -417,6 +424,23 @@ int vrrp_event(struct vrrp_router *r, int event);
 
 /* Other ------------------------------------------------------------------- */
 
+/*
+ * Search for and automatically configure VRRP instances on interfaces.
+ *
+ * ifp
+ *    Interface to autoconfig. If it is a macvlan interface and has a VRRP MAC,
+ *    a VRRP instance corresponding to VMAC assigned to macvlan will be created
+ *    on the parent interface and all addresses on the macvlan interface except
+ *    the v6 link local will be configured as VRRP addresses. If NULL, this
+ *    treatment will be applied to all existing interfaces matching the above
+ *    criterion.
+ *
+ * Returns:
+ *    -1 on failure
+ *     0 otherwise
+ */
+int vrrp_autoconfig(struct interface *ifp);
+
 /*
  * Find VRRP Virtual Router by Virtual Router ID
  */

vrrpd/vrrp_vty.c

@@ -287,6 +287,26 @@ DEFPY(vrrp_preempt,
 	return CMD_SUCCESS;
 }
 
+DEFPY(vrrp_autoconf,
+      vrrp_autoconf_cmd,
+      "[no] vrrp autoconfig [version (2-3)]",
+      NO_STR
+      VRRP_STR
+      "Automatically set up VRRP instances on VRRP-compatible interfaces\n"
+      "Version for automatically configured instances\n"
+      VRRP_VERSION_STR)
+{
+	vrrp_autoconfig_on = !no;
+	version = version ? version : 3;
+
+	if (vrrp_autoconfig_on)
+		vrrp_autoconfig(NULL);
+
+	vrrp_autoconfig_version = !no ? version : vrrp_autoconfig_version;
+
+	return CMD_SUCCESS;
+}
+
 static void vrrp_show(struct vty *vty, struct vrrp_vrouter *vr)
 {
 	char ethstr4[ETHER_ADDR_STRLEN];
@@ -401,6 +421,7 @@ void vrrp_vty_init(void)
 	if_cmd_init();
 	install_element(VIEW_NODE, &show_debugging_vrrpd_cmd);
 	install_element(VIEW_NODE, &vrrp_vrid_show_cmd);
+	install_element(CONFIG_NODE, &vrrp_autoconf_cmd);
 	install_element(INTERFACE_NODE, &vrrp_vrid_cmd);
 	install_element(INTERFACE_NODE, &vrrp_priority_cmd);
 	install_element(INTERFACE_NODE, &vrrp_advertisement_interval_cmd);

vrrpd/vrrp_zebra.c

@@ -61,7 +61,8 @@ static int vrrp_zebra_if_add(int command, struct zclient *zclient,
 	if (!ifp)
 		return 0;
 
-	/* FIXME: handle subinterface creation here */
+	if (vrrp_autoconfig_on)
+		vrrp_autoconfig(ifp);
 
 	return 0;
 }

zebra/zapi_msg.c

@@ -71,6 +71,7 @@
 static void zserv_encode_interface(struct stream *s, struct interface *ifp)
 {
 	/* Interface information. */
+	struct zebra_if *zif = ifp->info;
 	stream_put(s, ifp->name, INTERFACE_NAMSIZ);
 	stream_putl(s, ifp->ifindex);
 	stream_putc(s, ifp->status);
@@ -82,6 +83,7 @@ static void zserv_encode_interface(struct stream *s, struct interface *ifp)
 	stream_putl(s, ifp->mtu);
 	stream_putl(s, ifp->mtu6);
 	stream_putl(s, ifp->bandwidth);
+	stream_putl(s, zif->link_ifindex);
 	stream_putl(s, ifp->ll_type);
 	stream_putl(s, ifp->hw_addr_len);
 	if (ifp->hw_addr_len)