ip: add API to retrieve IPv6 link-layer address

Type: feature

Change-Id: I5739869490155b0b9674b4faf61882d97e66a4ed
Signed-off-by: Benoît Ganne <bganne@cisco.com>

src/vnet/ip/ip.api

@@ -20,7 +20,7 @@
     called through a shared memory interface.
 */
 
-option version = "3.0.1";
+option version = "3.0.2";
 
 import "vnet/interface_types.api";
 import "vnet/fib/fib_types.api";
@@ -549,6 +549,29 @@ autoreply define sw_interface_ip6_set_link_local_address
   vl_api_ip6_address_t ip;
 };
 
+/** \brief IPv6 get link local address on interface request
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param sw_if_index - interface to set link local on
+*/
+define sw_interface_ip6_get_link_local_address
+{
+  u32 client_index;
+  u32 context;
+  vl_api_interface_index_t sw_if_index;
+};
+
+/** \brief IPv6 link local address detail
+    @param context - sender context, to match reply w/ request
+    @param ip - the link local address
+*/
+define sw_interface_ip6_get_link_local_address_reply
+{
+  u32 context;
+  i32 retval;
+  vl_api_ip6_address_t ip;
+};
+
 /** \brief IOAM enable : Enable in-band OAM
     @param id - profile id
     @param seqno - To enable Seqno Processing

src/vnet/ip/ip_api.c

@@ -97,6 +97,8 @@ _(IP_SOURCE_AND_PORT_RANGE_CHECK_INTERFACE_ADD_DEL,                     \
      ip_source_and_port_range_check_interface_add_del)                        \
   _ (SW_INTERFACE_IP6_SET_LINK_LOCAL_ADDRESS,                                 \
      sw_interface_ip6_set_link_local_address)                                 \
+  _ (SW_INTERFACE_IP6_GET_LINK_LOCAL_ADDRESS,                                 \
+     sw_interface_ip6_get_link_local_address)                                 \
   _ (IP_REASSEMBLY_SET, ip_reassembly_set)                                    \
   _ (IP_REASSEMBLY_GET, ip_reassembly_get)                                    \
   _ (IP_REASSEMBLY_ENABLE_DISABLE, ip_reassembly_enable_disable)              \
@@ -1363,6 +1365,30 @@ static void
   REPLY_MACRO (VL_API_SW_INTERFACE_IP6_SET_LINK_LOCAL_ADDRESS_REPLY);
 }
 
+static void
+vl_api_sw_interface_ip6_get_link_local_address_t_handler (
+  vl_api_sw_interface_ip6_get_link_local_address_t *mp)
+{
+  vl_api_sw_interface_ip6_get_link_local_address_reply_t *rmp;
+  const ip6_address_t *ip = NULL;
+  int rv = 0;
+
+  VALIDATE_SW_IF_INDEX (mp);
+
+  ip = ip6_get_link_local_address (ntohl (mp->sw_if_index));
+  if (NULL == ip)
+    rv = VNET_API_ERROR_IP6_NOT_ENABLED;
+
+  BAD_SW_IF_INDEX_LABEL;
+  /* clang-format off */
+  REPLY_MACRO2 (VL_API_SW_INTERFACE_IP6_GET_LINK_LOCAL_ADDRESS_REPLY,
+  ({
+    if (!rv)
+      ip6_address_encode (ip, rmp->ip);
+  }))
+  /* clang-format on */
+}
+
 static void
 vl_api_ip_table_replace_begin_t_handler (vl_api_ip_table_replace_begin_t * mp)
 {

test/vpp_interface.py

@@ -97,6 +97,10 @@ class VppInterface(metaclass=abc.ABCMeta):
     @property
     def local_ip6_ll(self):
         """Local IPv6 link-local address on VPP interface (string)."""
+        if not self._local_ip6_ll:
+            self._local_ip6_ll = str(
+                self.test.vapi.sw_interface_ip6_get_link_local_address(
+                    self.sw_if_index).ip)
         return self._local_ip6_ll
 
     @property
@@ -192,7 +196,6 @@ class VppInterface(metaclass=abc.ABCMeta):
 
     def set_mac(self, mac):
         self._local_mac = str(mac)
-        self._local_ip6_ll = mk_ll_addr(self._local_mac)
         self.test.vapi.sw_interface_set_mac_address(
             self.sw_if_index, mac.packed)
         return self
@@ -234,8 +237,8 @@ class VppInterface(metaclass=abc.ABCMeta):
                 "Could not find interface with sw_if_index %d "
                 "in interface dump %s" %
                 (self.sw_if_index, moves.reprlib.repr(r)))
-        self._local_ip6_ll = mk_ll_addr(self.local_mac)
         self._remote_ip6_ll = mk_ll_addr(self.remote_mac)
+        self._local_ip6_ll = None
 
     def config_ip4(self):
         """Configure IPv4 address on the VPP interface."""