interface: callback to manage extra MAC addresses

Type: feature

New callback vnet_hw_interface_add_del_mac_address().

Add or delete secondary MAC addresses on a hardware interface.
This will allow packets to be processed which have a destination
MAC address other than the primary programmed MAC address without
needing to put the device into promiscuous mode.

Change-Id: I6beecbcb8932fc1fe45b567f76fa3706feefae2c
Signed-off-by: Matthew Smith <mgsmith@netgate.com>

6 files changed, 256 insertions, 1 deletions

diff --git a/src/vnet/interface.api b/src/vnet/interface.api
index ff0946538f4..02d7a505a51 100644
--- a/src/vnet/interface.api
+++ b/src/vnet/interface.api
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-option version = "3.1.0";
+option version = "3.2.0";
 
 import "vnet/interface_types.api";
 import "vnet/ethernet/ethernet_types.api";
@@ -310,6 +310,22 @@ autoreply define sw_interface_tag_add_del
   string tag[64];
 };
 
+/** \brief Add or delete a secondary MAC address on an interface
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param sw_if_index - the interface whose MAC will be set
+    @param mac_addr - the new MAC address
+    @param is_add - 0 to delete, != 0 to add
+*/
+autoreply define sw_interface_add_del_mac_address
+{
+    u32 client_index;
+    u32 context;
+    u32 sw_if_index;
+    vl_api_mac_address_t addr;
+    u8 is_add;
+};
+
 /** \brief Set an interface's MAC address
     @param client_index - opaque cookie to identify the sender
     @param context - sender context, to match reply w/ request
diff --git a/src/vnet/interface.c b/src/vnet/interface.c
index 0f6b8aeab07..0b4d78afbde 100644
--- a/src/vnet/interface.c
+++ b/src/vnet/interface.c
@@ -1427,6 +1427,48 @@ vnet_rename_interface (vnet_main_t * vnm, u32 hw_if_index, char *new_name)
   return error;
 }
 
+clib_error_t *
+vnet_hw_interface_add_del_mac_address (vnet_main_t * vnm,
+				       u32 hw_if_index,
+				       const u8 * mac_address, u8 is_add)
+{
+  clib_error_t *error = 0;
+  vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);
+
+  vnet_device_class_t *dev_class =
+    vnet_get_device_class (vnm, hi->dev_class_index);
+
+  if (!hi->hw_address)
+    {
+      error =
+	clib_error_return
+	(0, "Secondary MAC Addresses not supported for interface index %u",
+	 hw_if_index);
+      goto done;
+    }
+
+  if (dev_class->mac_addr_add_del_function)
+    error = dev_class->mac_addr_add_del_function (hi, mac_address, is_add);
+
+  if (!error)
+    {
+      vnet_hw_interface_class_t *hw_class;
+
+      hw_class = vnet_get_hw_interface_class (vnm, hi->hw_class_index);
+
+      if (NULL != hw_class->mac_addr_add_del_function)
+	error = hw_class->mac_addr_add_del_function (hi, mac_address, is_add);
+    }
+
+  /* If no errors, add to the list of secondary MACs on the ethernet intf */
+  if (!error)
+    ethernet_interface_add_del_address (&ethernet_main, hw_if_index,
+					mac_address, is_add);
+
+done:
+  return error;
+}
+
 static clib_error_t *
 vnet_hw_interface_change_mac_address_helper (vnet_main_t * vnm,
 					     u32 hw_if_index,
diff --git a/src/vnet/interface.h b/src/vnet/interface.h
index 7d73c5f6473..e6450f5bf59 100644
--- a/src/vnet/interface.h
+++ b/src/vnet/interface.h
@@ -74,6 +74,10 @@ typedef clib_error_t *(vnet_interface_set_mac_address_function_t)
   (struct vnet_hw_interface_t * hi,
    const u8 * old_address, const u8 * new_address);
 
+/* Interface add/del additional mac address callback */
+typedef clib_error_t *(vnet_interface_add_del_mac_address_function_t)
+  (struct vnet_hw_interface_t * hi, const u8 * address, u8 is_add);
+
 /* Interface set rx mode callback. */
 typedef clib_error_t *(vnet_interface_set_rx_mode_function_t)
   (struct vnet_main_t * vnm, u32 if_index, u32 queue_id,
@@ -266,6 +270,9 @@ typedef struct _vnet_device_class
 
   /* Function to set mac address. */
   vnet_interface_set_mac_address_function_t *mac_addr_change_function;
+
+  /* Function to add/delete additional MAC addresses */
+  vnet_interface_add_del_mac_address_function_t *mac_addr_add_del_function;
 } vnet_device_class_t;
 
 #ifndef CLIB_MARCH_VARIANT
@@ -392,6 +399,9 @@ typedef struct _vnet_hw_interface_class
   /* Function to call when link MAC changes. */
   vnet_interface_set_mac_address_function_t *mac_addr_change_function;
 
+  /* Function to add/delete additional MAC addresses */
+  vnet_interface_add_del_mac_address_function_t *mac_addr_add_del_function;
+
   /* Format function to display interface name. */
   format_function_t *format_interface_name;
 
diff --git a/src/vnet/interface_api.c b/src/vnet/interface_api.c
index 687f599b616..4d5dab30f38 100644
--- a/src/vnet/interface_api.c
+++ b/src/vnet/interface_api.c
@@ -68,6 +68,7 @@ _(SW_INTERFACE_GET_TABLE, sw_interface_get_table)               \
 _(SW_INTERFACE_SET_UNNUMBERED, sw_interface_set_unnumbered)     \
 _(SW_INTERFACE_CLEAR_STATS, sw_interface_clear_stats)           \
 _(SW_INTERFACE_TAG_ADD_DEL, sw_interface_tag_add_del)           \
+_(SW_INTERFACE_ADD_DEL_MAC_ADDRESS, sw_interface_add_del_mac_address) \
 _(SW_INTERFACE_SET_MAC_ADDRESS, sw_interface_set_mac_address)   \
 _(SW_INTERFACE_GET_MAC_ADDRESS, sw_interface_get_mac_address)   \
 _(CREATE_VLAN_SUBIF, create_vlan_subif)                         \
@@ -899,6 +900,34 @@ out:
   REPLY_MACRO (VL_API_SW_INTERFACE_TAG_ADD_DEL_REPLY);
 }
 
+static void vl_api_sw_interface_add_del_mac_address_t_handler
+  (vl_api_sw_interface_add_del_mac_address_t * mp)
+{
+  vl_api_sw_interface_add_del_mac_address_reply_t *rmp;
+  vnet_main_t *vnm = vnet_get_main ();
+  u32 sw_if_index = ntohl (mp->sw_if_index);
+  vnet_hw_interface_t *hi;
+  clib_error_t *error;
+  int rv = 0;
+
+  VALIDATE_SW_IF_INDEX (mp);
+
+  /* for subifs, the MAC should be changed on the actual hw if */
+  hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
+  error = vnet_hw_interface_add_del_mac_address (vnm, hi->hw_if_index,
+						 mp->addr, mp->is_add);
+  if (error)
+    {
+      rv = VNET_API_ERROR_UNIMPLEMENTED;
+      clib_error_report (error);
+      goto out;
+    }
+
+  BAD_SW_IF_INDEX_LABEL;
+out:
+  REPLY_MACRO (VL_API_SW_INTERFACE_ADD_DEL_MAC_ADDRESS_REPLY);
+}
+
 static void vl_api_sw_interface_set_mac_address_t_handler
   (vl_api_sw_interface_set_mac_address_t * mp)
 {
diff --git a/src/vnet/interface_cli.c b/src/vnet/interface_cli.c
index c622a605be8..a66e1576bde 100644
--- a/src/vnet/interface_cli.c
+++ b/src/vnet/interface_cli.c
@@ -1165,6 +1165,158 @@ VLIB_CLI_COMMAND (set_interface_mtu_cmd, static) = {
 /* *INDENT-ON* */
 
 static clib_error_t *
+show_interface_sec_mac_addr_fn (vlib_main_t * vm, unformat_input_t * input,
+				vlib_cli_command_t * cmd)
+{
+  vnet_main_t *vnm = vnet_get_main ();
+  vnet_interface_main_t *im = &vnm->interface_main;
+  ethernet_main_t *em = &ethernet_main;
+  u32 sw_if_index = ~0;
+  vnet_sw_interface_t *si, *sorted_sis = 0;
+
+  if (unformat (input, "%U", unformat_vnet_sw_interface, vnm, &sw_if_index))
+    {
+      si = pool_elt_at_index (im->sw_interfaces, sw_if_index);
+      vec_add1 (sorted_sis, si[0]);
+    }
+
+  /* if an interface name was not passed, get all interfaces */
+  if (vec_len (sorted_sis) == 0)
+    {
+      sorted_sis =
+	vec_new (vnet_sw_interface_t, pool_elts (im->sw_interfaces));
+      _vec_len (sorted_sis) = 0;
+      /* *INDENT-OFF* */
+      pool_foreach (si, im->sw_interfaces,
+      ({
+        int visible = vnet_swif_is_api_visible (si);
+        if (visible)
+          vec_add1 (sorted_sis, si[0]);}
+        ));
+      /* *INDENT-ON* */
+      /* Sort by name. */
+      vec_sort_with_function (sorted_sis, sw_interface_name_compare);
+    }
+
+  vec_foreach (si, sorted_sis)
+  {
+    vnet_sw_interface_t *sup_si;
+    ethernet_interface_t *ei;
+
+    sup_si = vnet_get_sup_sw_interface (vnm, si->sw_if_index);
+    ei = ethernet_get_interface (em, sup_si->hw_if_index);
+
+    vlib_cli_output (vm, "%U (%s):",
+		     format_vnet_sw_if_index_name, vnm, si->sw_if_index,
+		     (si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) ?
+		     "up" : "dn");
+
+    if (ei && ei->secondary_addrs)
+      {
+	mac_address_t *sec_addr;
+
+	vec_foreach (sec_addr, ei->secondary_addrs)
+	{
+	  vlib_cli_output (vm, "  %U", format_mac_address_t, sec_addr);
+	}
+      }
+  }
+
+  vec_free (sorted_sis);
+  return 0;
+}
+
+/*?
+ * This command is used to display interface secondary mac addresses.
+ *
+ * @cliexpar
+ * Example of how to display interface secondary mac addresses:
+ * @cliexstart{show interface secondary-mac-address}
+ * @cliexend
+?*/
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (show_interface_sec_mac_addr, static) = {
+  .path = "show interface secondary-mac-address",
+  .short_help = "show interface secondary-mac-address [<interface>]",
+  .function = show_interface_sec_mac_addr_fn,
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+interface_add_del_mac_address (vlib_main_t * vm, unformat_input_t * input,
+			       vlib_cli_command_t * cmd)
+{
+  vnet_main_t *vnm = vnet_get_main ();
+  vnet_sw_interface_t *si = NULL;
+  clib_error_t *error = 0;
+  u32 sw_if_index = ~0;
+  u8 mac[6] = { 0 };
+  u8 is_add, is_del;
+
+  is_add = is_del = 0;
+
+  if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
+    {
+      error = clib_error_return (0, "unknown interface `%U'",
+				 format_unformat_error, input);
+      goto done;
+    }
+  if (!unformat_user (input, unformat_ethernet_address, mac))
+    {
+      error = clib_error_return (0, "expected mac address `%U'",
+				 format_unformat_error, input);
+      goto done;
+    }
+
+  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (input, "add"))
+	is_add = 1;
+      else if (unformat (input, "del"))
+	is_del = 1;
+      else
+	break;
+    }
+
+  if (is_add == is_del)
+    {
+      error = clib_error_return (0, "must choose one of add or del");
+      goto done;
+    }
+
+  si = vnet_get_sw_interface (vnm, sw_if_index);
+  error =
+    vnet_hw_interface_add_del_mac_address (vnm, si->hw_if_index, mac, is_add);
+
+done:
+  return error;
+}
+
+/*?
+ * The '<em>set interface secondary-mac-address </em>' command allows adding
+ * or deleting extra MAC addresses on a given interface without changing the
+ * default MAC address. This could allow packets sent to these MAC addresses
+ * to be received without setting the interface to promiscuous mode.
+ * Not all interfaces support this operation. The ones that do are mostly
+ * hardware NICs, though virtio does also.
+ *
+ * @cliexpar
+ * @parblock
+ * Example of how to add a secondary MAC Address on an interface:
+ * @cliexcmd{set interface secondary-mac-address GigabitEthernet0/8/0 aa:bb:cc:dd:ee:01 add}
+ * Example of how to delete a secondary MAC address from an interface:
+ * @cliexcmd{set interface secondary-mac-address GigabitEthernet0/8/0 aa:bb:cc:dd:ee:01 del}
+ * @endparblock
+?*/
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (interface_add_del_mac_address_cmd, static) = {
+  .path = "set interface secondary-mac-address",
+  .short_help = "set interface secondary-mac-address <interface> <mac-address> [(add|del)]",
+  .function = interface_add_del_mac_address,
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
 set_interface_mac_address (vlib_main_t * vm, unformat_input_t * input,
 			   vlib_cli_command_t * cmd)
 {
diff --git a/src/vnet/interface_funcs.h b/src/vnet/interface_funcs.h
index c0ad81c6d87..9241b34d59d 100644
--- a/src/vnet/interface_funcs.h
+++ b/src/vnet/interface_funcs.h
@@ -390,6 +390,12 @@ void vnet_hw_interface_init_for_class (vnet_main_t * vnm, u32 hw_if_index,
 clib_error_t *vnet_rename_interface (vnet_main_t * vnm, u32 hw_if_index,
 				     char *new_name);
 
+/* Add/delete secondary interface mac address*/
+clib_error_t *vnet_hw_interface_add_del_mac_address (vnet_main_t * vnm,
+						     u32 hw_if_index,
+						     const u8 * mac_address,
+						     u8 is_add);
+
 /* Change interface mac address*/
 clib_error_t *vnet_hw_interface_change_mac_address (vnet_main_t * vnm,
 						    u32 hw_if_index,