net: marvell: prestera: Register inetaddr stub notifiers

Initial implementation of notification handlers. For now this is just
stub.
So that we can move forward and add prestera_router_hw's objects
manipulations.

We support several addresses on interface. We just have nothing to do for
second address, because rif is already enabled on this interface, after
first one.
Co-developed-by: Taras Chornyi <tchornyi@marvell.com>
Signed-off-by: Taras Chornyi <tchornyi@marvell.com>
Co-developed-by: Oleksandr Mazur <oleksandr.mazur@plvision.eu>
Signed-off-by: Oleksandr Mazur <oleksandr.mazur@plvision.eu>
Signed-off-by: Yevhen Orlov <yevhen.orlov@plvision.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/prestera/prestera.h

@@ -281,6 +281,8 @@ struct prestera_router {
 	struct prestera_switch *sw;
 	struct list_head vr_list;
 	struct list_head rif_entry_list;
+	struct notifier_block inetaddr_nb;
+	struct notifier_block inetaddr_valid_nb;
 	bool aborted;
 };
 
@@ -328,6 +330,8 @@ int prestera_port_pvid_set(struct prestera_port *port, u16 vid);
 
 bool prestera_netdev_check(const struct net_device *dev);
 
+int prestera_is_valid_mac_addr(struct prestera_port *port, const u8 *addr);
+
 bool prestera_port_is_lag_member(const struct prestera_port *port);
 
 struct prestera_lag *prestera_lag_by_id(struct prestera_switch *sw, u16 id);

drivers/net/ethernet/marvell/prestera/prestera_main.c

@@ -163,7 +163,7 @@ static netdev_tx_t prestera_port_xmit(struct sk_buff *skb,
 	return prestera_rxtx_xmit(netdev_priv(dev), skb);
 }
 
-static int prestera_is_valid_mac_addr(struct prestera_port *port, u8 *addr)
+int prestera_is_valid_mac_addr(struct prestera_port *port, const u8 *addr)
 {
 	if (!is_valid_ether_addr(addr))
 		return -EADDRNOTAVAIL;

drivers/net/ethernet/marvell/prestera/prestera_router.c

@@ -3,10 +3,98 @@
 
 #include <linux/kernel.h>
 #include <linux/types.h>
+#include <linux/inetdevice.h>
 
 #include "prestera.h"
 #include "prestera_router_hw.h"
 
+static int __prestera_inetaddr_port_event(struct net_device *port_dev,
+					  unsigned long event,
+					  struct netlink_ext_ack *extack)
+{
+	struct prestera_port *port = netdev_priv(port_dev);
+	int err;
+
+	err = prestera_is_valid_mac_addr(port, port_dev->dev_addr);
+	if (err) {
+		NL_SET_ERR_MSG_MOD(extack, "RIF MAC must have the same prefix");
+		return err;
+	}
+
+	switch (event) {
+	case NETDEV_UP:
+	case NETDEV_DOWN:
+		break;
+	}
+
+	return 0;
+}
+
+static int __prestera_inetaddr_event(struct prestera_switch *sw,
+				     struct net_device *dev,
+				     unsigned long event,
+				     struct netlink_ext_ack *extack)
+{
+	if (prestera_netdev_check(dev) && !netif_is_bridge_port(dev) &&
+	    !netif_is_lag_port(dev) && !netif_is_ovs_port(dev))
+		return __prestera_inetaddr_port_event(dev, event, extack);
+
+	return 0;
+}
+
+static int __prestera_inetaddr_cb(struct notifier_block *nb,
+				  unsigned long event, void *ptr)
+{
+	struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
+	struct net_device *dev = ifa->ifa_dev->dev;
+	struct prestera_router *router = container_of(nb,
+						      struct prestera_router,
+						      inetaddr_nb);
+	struct in_device *idev;
+	int err = 0;
+
+	if (event != NETDEV_DOWN)
+		goto out;
+
+	/* Ignore if this is not latest address */
+	idev = __in_dev_get_rtnl(dev);
+	if (idev && idev->ifa_list)
+		goto out;
+
+	err = __prestera_inetaddr_event(router->sw, dev, event, NULL);
+out:
+	return notifier_from_errno(err);
+}
+
+static int __prestera_inetaddr_valid_cb(struct notifier_block *nb,
+					unsigned long event, void *ptr)
+{
+	struct in_validator_info *ivi = (struct in_validator_info *)ptr;
+	struct net_device *dev = ivi->ivi_dev->dev;
+	struct prestera_router *router = container_of(nb,
+						      struct prestera_router,
+						      inetaddr_valid_nb);
+	struct in_device *idev;
+	int err = 0;
+
+	if (event != NETDEV_UP)
+		goto out;
+
+	/* Ignore if this is not first address */
+	idev = __in_dev_get_rtnl(dev);
+	if (idev && idev->ifa_list)
+		goto out;
+
+	if (ipv4_is_multicast(ivi->ivi_addr)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	err = __prestera_inetaddr_event(router->sw, dev, event, ivi->extack);
+out:
+	return notifier_from_errno(err);
+}
+
 int prestera_router_init(struct prestera_switch *sw)
 {
 	struct prestera_router *router;
@@ -23,8 +111,22 @@ int prestera_router_init(struct prestera_switch *sw)
 	if (err)
 		goto err_router_lib_init;
 
+	router->inetaddr_valid_nb.notifier_call = __prestera_inetaddr_valid_cb;
+	err = register_inetaddr_validator_notifier(&router->inetaddr_valid_nb);
+	if (err)
+		goto err_register_inetaddr_validator_notifier;
+
+	router->inetaddr_nb.notifier_call = __prestera_inetaddr_cb;
+	err = register_inetaddr_notifier(&router->inetaddr_nb);
+	if (err)
+		goto err_register_inetaddr_notifier;
+
 	return 0;
 
+err_register_inetaddr_notifier:
+	unregister_inetaddr_validator_notifier(&router->inetaddr_valid_nb);
+err_register_inetaddr_validator_notifier:
+	/* prestera_router_hw_fini */
 err_router_lib_init:
 	kfree(sw->router);
 	return err;
@@ -32,6 +134,9 @@ int prestera_router_init(struct prestera_switch *sw)
 
 void prestera_router_fini(struct prestera_switch *sw)
 {
+	unregister_inetaddr_notifier(&sw->router->inetaddr_nb);
+	unregister_inetaddr_validator_notifier(&sw->router->inetaddr_valid_nb);
+	/* router_hw_fini */
 	kfree(sw->router);
 	sw->router = NULL;
 }