session: update due to clib_socket refactoring

After the clib_socket_init syntax changed, the behavior of VCL
socket creation was broken. This patch introduces app_namespace_add_del_v4
to address the behavioral change.

Type: refactor

Change-Id: Ice016bdb372233fd3317f166d45625e086e9b4df
Signed-off-by: Nathan Skrzypczak <nathan.skrzypczak@gmail.com>

5 files changed, 134 insertions, 59 deletions

diff --git a/src/vnet/session/application_namespace.c b/src/vnet/session/application_namespace.c
index cd2636cff32..13b540cd3b8 100644
--- a/src/vnet/session/application_namespace.c
+++ b/src/vnet/session/application_namespace.c
@@ -119,11 +119,6 @@ vnet_app_namespace_add_del (vnet_app_namespace_add_del_args_t * a)
 	  st->is_local = 1;
 	  st->appns_index = app_namespace_index (app_ns);
 	  app_ns->local_table_index = session_table_index (st);
-	  if (a->netns)
-	    {
-	      app_ns->netns = vec_dup (a->netns);
-	      vec_terminate_c_string (app_ns->netns);
-	    }
 	  if (a->sock_name)
 	    {
 	      app_ns->sock_name = vec_dup (a->sock_name);
@@ -167,8 +162,6 @@ vnet_app_namespace_add_del (vnet_app_namespace_add_del_args_t * a)
       st = session_table_get (app_ns->local_table_index);
 
       session_table_free (st, FIB_PROTOCOL_MAX);
-      if (app_ns->netns)
-	vec_free (app_ns->netns);
       if (app_ns->sock_name)
 	vec_free (app_ns->sock_name);
 
@@ -255,7 +248,6 @@ app_namespaces_init (void)
   /* clang-format off */
   vnet_app_namespace_add_del_args_t a = {
     .ns_id = ns_id,
-    .netns = 0,
     .sock_name = 0,
     .secret = 0,
     .sw_if_index = APP_NAMESPACE_INVALID_INDEX,
@@ -272,7 +264,7 @@ app_ns_fn (vlib_main_t * vm, unformat_input_t * input,
 	   vlib_cli_command_t * cmd)
 {
   u8 is_add = 0, *ns_id = 0, secret_set = 0, sw_if_index_set = 0;
-  u8 *netns = 0, *sock_name = 0;
+  u8 *sock_name = 0;
   unformat_input_t _line_input, *line_input = &_line_input;
   u32 sw_if_index, fib_id = APP_NAMESPACE_INVALID_INDEX;
   vnet_main_t *vnm = vnet_get_main ();
@@ -302,8 +294,6 @@ app_ns_fn (vlib_main_t * vm, unformat_input_t * input,
 	sw_if_index_set = 1;
       else if (unformat (line_input, "fib_id", &fib_id))
 	;
-      else if (unformat (line_input, "netns %_%v%_", &netns))
-	;
       else if (unformat (line_input, "sock-name %_%v%_", &sock_name))
 	;
       else
@@ -329,7 +319,6 @@ app_ns_fn (vlib_main_t * vm, unformat_input_t * input,
   /* clang-format off */
   vnet_app_namespace_add_del_args_t args = {
     .ns_id = ns_id,
-    .netns = netns,
     .secret = secret,
     .sw_if_index = sw_if_index,
     .sock_name = sock_name,
@@ -344,7 +333,6 @@ app_ns_fn (vlib_main_t * vm, unformat_input_t * input,
 done:
 
   vec_free (ns_id);
-  vec_free (netns);
   vec_free (sock_name);
   unformat_free (line_input);
 
@@ -355,7 +343,7 @@ done:
 VLIB_CLI_COMMAND (app_ns_command, static) = {
   .path = "app ns",
   .short_help = "app ns [add|del] id <namespace-id> secret <secret> "
-		"sw_if_index <sw_if_index> if <interface> [netns <ns>]",
+		"sw_if_index <sw_if_index> if <interface>",
   .function = app_ns_fn,
 };
 /* *INDENT-ON* */
@@ -371,8 +359,6 @@ format_app_namespace (u8 * s, va_list * args)
   if (app_ns->sw_if_index != (u32) ~0)
     s = format (s, "\nInterface: %U", format_vnet_sw_if_index_name, vnm,
 		app_ns->sw_if_index);
-  if (app_ns->netns)
-    s = format (s, "\nNetns:     %s", app_ns->netns);
   if (app_ns->sock_name)
     s = format (s, "\nSocket:    %s", app_ns->sock_name);
 
@@ -482,8 +468,7 @@ show_app_ns_fn (vlib_main_t * vm, unformat_input_t * main_input,
     }
 
 do_ns_list:
-  table_add_header_col (t, 6, "Index", "Secret", "Interface", "Id", "Netns",
-			"Socket");
+  table_add_header_col (t, 5, "Index", "Secret", "Interface", "Id", "Socket");
   int i = 0;
   pool_foreach (app_ns, app_namespace_pool)
     {
@@ -493,7 +478,6 @@ do_ns_list:
       table_format_cell (t, i, j++, "%U", format_vnet_sw_if_index_name, vnm,
 			 app_ns->sw_if_index);
       table_format_cell (t, i, j++, "%s", app_ns->ns_id);
-      table_format_cell (t, i, j++, "%s", app_ns->netns);
       table_format_cell (t, i++, j++, "%s", app_ns->sock_name);
     }
 
diff --git a/src/vnet/session/application_namespace.h b/src/vnet/session/application_namespace.h
index 1750d41fff8..02a4a0780d4 100644
--- a/src/vnet/session/application_namespace.h
+++ b/src/vnet/session/application_namespace.h
@@ -51,11 +51,6 @@ typedef struct _app_namespace
   u8 *ns_id;
 
   /**
-   * Linux netns if one was provided
-   */
-  u8 *netns;
-
-  /**
    * Name of socket applications can use to attach to session layer
    */
   u8 *sock_name;
@@ -69,7 +64,6 @@ typedef struct _app_namespace
 typedef struct _vnet_app_namespace_add_del_args
 {
   u8 *ns_id;
-  u8 *netns;
   u8 *sock_name;
   u64 secret;
   u32 sw_if_index;
diff --git a/src/vnet/session/session.api b/src/vnet/session/session.api
index 9a7bb0139bd..6affae4112d 100644
--- a/src/vnet/session/session.api
+++ b/src/vnet/session/session.api
@@ -219,9 +219,49 @@ define app_namespace_add_del {
     @param ip6_fib_id - id of ip6 fib that "supports" the namespace. Ignored
                         if sw_if_index set.
     @param namespace_id - namespace id
+    @param sock_name - socket name (path, abstract socket name)
+*/
+define app_namespace_add_del_v4 {
+  option deprecated;
+  u32 client_index;
+  u32 context;
+  u64 secret;
+  bool is_add [default=true];
+  vl_api_interface_index_t sw_if_index [default=0xffffffff];
+  u32 ip4_fib_id;
+  u32 ip6_fib_id;
+  string namespace_id[64];
+  string sock_name[];
+};
+
+/** \brief Reply for app namespace add/del
+    @param context - returned sender context, to match reply w/ request
+    @param retval - return code
+    @param appns_index - app namespace index
+*/
+define app_namespace_add_del_v4_reply
+{
+  u32 context;
+  i32 retval;
+  u32 appns_index;
+};
+
+/** \brief add/del application namespace
+    @param client_index - opaque cookie to identify the sender
+                          client to vpp direction only
+    @param context - sender context, to match reply w/ request
+    @param secret - secret shared between app and vpp
+    @param sw_if_index - local interface that "supports" namespace. Set to
+                         ~0 if no preference
+    @param ip4_fib_id - id of ip4 fib that "supports" the namespace. Ignored
+                        if sw_if_index set.
+    @param ip6_fib_id - id of ip6 fib that "supports" the namespace. Ignored
+                        if sw_if_index set.
+    @param namespace_id - namespace id
     @param netns - linux net namespace
 */
 define app_namespace_add_del_v2 {
+  option deprecated;
   u32 client_index;
   u32 context;
   u64 secret;
@@ -248,6 +288,7 @@ define app_namespace_add_del_v2 {
     @param sock_name - socket name (path, abstract socket name)
 */
 define app_namespace_add_del_v3 {
+  option deprecated;
   u32 client_index;
   u32 context;
   u64 secret;
@@ -280,6 +321,7 @@ define app_namespace_add_del_reply
 */
 define app_namespace_add_del_v2_reply
 {
+  option deprecated;
   u32 context;
   i32 retval;
   u32 appns_index;
@@ -287,6 +329,7 @@ define app_namespace_add_del_v2_reply
 
 define app_namespace_add_del_v3_reply
 {
+  option deprecated;
   u32 context;
   i32 retval;
   u32 appns_index;
diff --git a/src/vnet/session/session_api.c b/src/vnet/session/session_api.c
index eb35f193ce6..3e99938dd6b 100644
--- a/src/vnet/session/session_api.c
+++ b/src/vnet/session/session_api.c
@@ -725,7 +725,6 @@ vl_api_app_namespace_add_del_t_handler (vl_api_app_namespace_add_del_t * mp)
 
   vnet_app_namespace_add_del_args_t args = {
     .ns_id = ns_id,
-    .netns = 0,
     .sock_name = 0,
     .secret = clib_net_to_host_u64 (mp->secret),
     .sw_if_index = clib_net_to_host_u32 (mp->sw_if_index),
@@ -759,7 +758,7 @@ vl_api_app_namespace_add_del_v2_t_handler (
   vl_api_app_namespace_add_del_v2_t *mp)
 {
   vl_api_app_namespace_add_del_v2_reply_t *rmp;
-  u8 *ns_id = 0, *netns = 0;
+  u8 *ns_id = 0;
   u32 appns_index = 0;
   int rv = 0;
 
@@ -770,13 +769,10 @@ vl_api_app_namespace_add_del_v2_t_handler (
     }
 
   mp->namespace_id[sizeof (mp->namespace_id) - 1] = 0;
-  mp->netns[sizeof (mp->netns) - 1] = 0;
   ns_id = format (0, "%s", &mp->namespace_id);
-  netns = format (0, "%s", &mp->netns);
 
   vnet_app_namespace_add_del_args_t args = {
     .ns_id = ns_id,
-    .netns = netns,
     .sock_name = 0,
     .secret = clib_net_to_host_u64 (mp->secret),
     .sw_if_index = clib_net_to_host_u32 (mp->sw_if_index),
@@ -795,7 +791,6 @@ vl_api_app_namespace_add_del_v2_t_handler (
 	}
     }
   vec_free (ns_id);
-  vec_free (netns);
 
 done:
   REPLY_MACRO2 (VL_API_APP_NAMESPACE_ADD_DEL_V2_REPLY, ({
@@ -805,11 +800,55 @@ done:
 }
 
 static void
+vl_api_app_namespace_add_del_v4_t_handler (
+  vl_api_app_namespace_add_del_v4_t *mp)
+{
+  vl_api_app_namespace_add_del_v4_reply_t *rmp;
+  u8 *ns_id = 0, *sock_name = 0;
+  u32 appns_index = 0;
+  int rv = 0;
+  if (session_main_is_enabled () == 0)
+    {
+      rv = VNET_API_ERROR_FEATURE_DISABLED;
+      goto done;
+    }
+  mp->namespace_id[sizeof (mp->namespace_id) - 1] = 0;
+  ns_id = format (0, "%s", &mp->namespace_id);
+  sock_name = vl_api_from_api_to_new_vec (mp, &mp->sock_name);
+  vnet_app_namespace_add_del_args_t args = {
+    .ns_id = ns_id,
+    .sock_name = sock_name,
+    .secret = clib_net_to_host_u64 (mp->secret),
+    .sw_if_index = clib_net_to_host_u32 (mp->sw_if_index),
+    .ip4_fib_id = clib_net_to_host_u32 (mp->ip4_fib_id),
+    .ip6_fib_id = clib_net_to_host_u32 (mp->ip6_fib_id),
+    .is_add = mp->is_add,
+  };
+  rv = vnet_app_namespace_add_del (&args);
+  if (!rv && mp->is_add)
+    {
+      appns_index = app_namespace_index_from_id (ns_id);
+      if (appns_index == APP_NAMESPACE_INVALID_INDEX)
+	{
+	  clib_warning ("app ns lookup failed id:%s", ns_id);
+	  rv = VNET_API_ERROR_UNSPECIFIED;
+	}
+    }
+  vec_free (ns_id);
+  vec_free (sock_name);
+done:
+  REPLY_MACRO2 (VL_API_APP_NAMESPACE_ADD_DEL_V4_REPLY, ({
+		  if (!rv)
+		    rmp->appns_index = clib_host_to_net_u32 (appns_index);
+		}));
+}
+
+static void
 vl_api_app_namespace_add_del_v3_t_handler (
   vl_api_app_namespace_add_del_v3_t *mp)
 {
   vl_api_app_namespace_add_del_v3_reply_t *rmp;
-  u8 *ns_id = 0, *netns = 0, *sock_name = 0;
+  u8 *ns_id = 0, *sock_name = 0, *api_sock_name = 0;
   u32 appns_index = 0;
   int rv = 0;
   if (session_main_is_enabled () == 0)
@@ -818,13 +857,22 @@ vl_api_app_namespace_add_del_v3_t_handler (
       goto done;
     }
   mp->namespace_id[sizeof (mp->namespace_id) - 1] = 0;
-  mp->netns[sizeof (mp->netns) - 1] = 0;
   ns_id = format (0, "%s", &mp->namespace_id);
-  netns = format (0, "%s", &mp->netns);
-  sock_name = vl_api_from_api_to_new_vec (mp, &mp->sock_name);
+  api_sock_name = vl_api_from_api_to_new_vec (mp, &mp->sock_name);
+  mp->netns[sizeof (mp->netns) - 1] = 0;
+  if (strlen ((char *) mp->netns) != 0)
+    {
+      sock_name =
+	format (0, "abstract:%v,netns_name=%s", api_sock_name, &mp->netns);
+    }
+  else
+    {
+      sock_name = api_sock_name;
+      api_sock_name = 0; // for vec_free
+    }
+
   vnet_app_namespace_add_del_args_t args = {
     .ns_id = ns_id,
-    .netns = netns,
     .sock_name = sock_name,
     .secret = clib_net_to_host_u64 (mp->secret),
     .sw_if_index = clib_net_to_host_u32 (mp->sw_if_index),
@@ -843,8 +891,8 @@ vl_api_app_namespace_add_del_v3_t_handler (
 	}
     }
   vec_free (ns_id);
-  vec_free (netns);
   vec_free (sock_name);
+  vec_free (api_sock_name);
 done:
   REPLY_MACRO2 (VL_API_APP_NAMESPACE_ADD_DEL_V3_REPLY, ({
 		  if (!rv)
@@ -1655,27 +1703,10 @@ appns_sapi_add_ns_socket (app_namespace_t * app_ns)
   clib_socket_t *cs;
   char dir[4096];
 
-  if (app_ns->netns)
-    {
-      if (!app_ns->sock_name)
-	app_ns->sock_name = format (0, "@vpp/session/%v%c", app_ns->ns_id, 0);
-      if (app_ns->sock_name[0] != '@')
-	return VNET_API_ERROR_INVALID_VALUE;
-    }
-  else
-    {
-      snprintf (dir, sizeof (dir), "%s%s", vlib_unix_get_runtime_dir (),
-		subdir);
-      err = vlib_unix_recursive_mkdir ((char *) dir);
-      if (err)
-	{
-	  clib_error_report (err);
-	  return VNET_API_ERROR_SYSCALL_ERROR_1;
-	}
+  snprintf (dir, sizeof (dir), "%s%s", vlib_unix_get_runtime_dir (), subdir);
 
-      if (!app_ns->sock_name)
-	app_ns->sock_name = format (0, "%s%v%c", dir, app_ns->ns_id, 0);
-    }
+  if (!app_ns->sock_name)
+    app_ns->sock_name = format (0, "%s%v%c", dir, app_ns->ns_id, 0);
 
   /*
    * Create and initialize socket to listen on
@@ -1686,13 +1717,24 @@ appns_sapi_add_ns_socket (app_namespace_t * app_ns)
     CLIB_SOCKET_F_ALLOW_GROUP_WRITE |
     CLIB_SOCKET_F_SEQPACKET | CLIB_SOCKET_F_PASSCRED;
 
-  if ((err = clib_socket_init_netns (cs, app_ns->netns)))
+  if (clib_socket_prefix_get_type (cs->config) == CLIB_SOCKET_TYPE_UNIX)
+    {
+      err = vlib_unix_recursive_mkdir ((char *) dir);
+      if (err)
+	{
+	  clib_error_report (err);
+	  return VNET_API_ERROR_SYSCALL_ERROR_1;
+	}
+    }
+
+  if ((err = clib_socket_init (cs)))
     {
       clib_error_report (err);
       return -1;
     }
 
-  if (!app_ns->netns && stat ((char *) app_ns->sock_name, &file_stat) == -1)
+  if (clib_socket_prefix_get_type (cs->config) == CLIB_SOCKET_TYPE_UNIX &&
+      stat ((char *) app_ns->sock_name, &file_stat) == -1)
     return -1;
 
   /*
diff --git a/src/vnet/session/session_test.c b/src/vnet/session/session_test.c
index 13970d55998..770e7263024 100644
--- a/src/vnet/session/session_test.c
+++ b/src/vnet/session/session_test.c
@@ -325,6 +325,18 @@ api_app_namespace_add_del (vat_main_t *vam)
 }
 
 static void
+vl_api_app_namespace_add_del_v4_reply_t_handler (
+  vl_api_app_namespace_add_del_v4_reply_t *mp)
+{
+}
+
+static int
+api_app_namespace_add_del_v4 (vat_main_t *vat)
+{
+  return -1;
+}
+
+static void
 vl_api_app_namespace_add_del_v3_reply_t_handler (
   vl_api_app_namespace_add_del_v3_reply_t *mp)
 {