session: add Source Deny List

With this feature, session enable is now modified to have 3 modes of operation
session enable -- only enable session
session enable rt-backend sdl -- enable session with sdl
session enable rt-backend rule-table -- enable session with rule-table

session rule tables are now created on demand, upon adding first rule
to the rule table.

refactor session table to remove depenency from sesssion rules table. Now
session rules table APIs take srtg_handle and transport
proto instead of srt pointer.

Type: feature

Change-Id: Idde6a9b2f46b29bb931f9039636562575572aa14
Signed-off-by: Steven Luong <sluong@cisco.com>

1 files changed, 53 insertions, 12 deletions

diff --git a/src/vnet/session/session_cli.c b/src/vnet/session/session_cli.c
index 569a77bccc1..76ecfeae243 100644
--- a/src/vnet/session/session_cli.c
+++ b/src/vnet/session/session_cli.c
@@ -482,6 +482,25 @@ session_cli_print_session_states (vlib_main_t * vm)
 #undef _
 }
 
+static u8 *
+format_rt_backend (u8 *s, va_list *args)
+{
+  u32 i = va_arg (*args, u32);
+  u8 *t = 0;
+
+  switch (i)
+    {
+#define _(v, s)                                                               \
+  case RT_BACKEND_ENGINE_##v:                                                 \
+    t = (u8 *) s;                                                             \
+    break;
+      foreach_rt_engine
+#undef _
+	default : return format (s, "unknown");
+    }
+  return format (s, "%s", t);
+}
+
 static clib_error_t *
 show_session_command_fn (vlib_main_t * vm, unformat_input_t * input,
 			 vlib_cli_command_t * cmd)
@@ -573,6 +592,11 @@ show_session_command_fn (vlib_main_t * vm, unformat_input_t * input,
 	  vlib_cli_output (vm, "%U", format_transport_protos);
 	  goto done;
 	}
+      else if (unformat (input, "rt-backend"))
+	{
+	  vlib_cli_output (vm, "%U", format_rt_backend, smm->rt_engine_type);
+	  goto done;
+	}
       else if (unformat (input, "states"))
 	{
 	  session_cli_print_session_states (vm);
@@ -654,13 +678,12 @@ done:
   return error;
 }
 
-VLIB_CLI_COMMAND (vlib_cli_show_session_command) =
-{
+VLIB_CLI_COMMAND (vlib_cli_show_session_command) = {
   .path = "show session",
   .short_help = "show session [verbose [n]] [listeners <proto>] "
 		"[<session-id> [elog]] [thread <n> [index <n>] "
 		"[proto <proto>] [state <state>] [range <min> [<max>]] "
-		"[protos] [states] ",
+		"[protos] [states] [rt-backend]",
   .function = show_session_command_fn,
 };
 
@@ -829,29 +852,47 @@ static clib_error_t *
 session_enable_disable_fn (vlib_main_t * vm, unformat_input_t * input,
 			   vlib_cli_command_t * cmd)
 {
-  u8 is_en = 2;
+  session_enable_disable_args_t args;
+  session_main_t *smm = &session_main;
 
   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
     {
       if (unformat (input, "enable"))
-	is_en = 1;
+	{
+	  args.is_en = 1;
+	  if (unformat (input, "rt-backend"))
+	  if (unformat (input, "sdl"))
+	    args.rt_engine_type = RT_BACKEND_ENGINE_SDL;
+	  else if (unformat (input, "rule-table"))
+	    args.rt_engine_type = RT_BACKEND_ENGINE_RULE_TABLE;
+	  else
+	    return clib_error_return (0, "unknown input `%U'",
+				      format_unformat_error, input);
+	  else
+	  args.rt_engine_type = RT_BACKEND_ENGINE_NONE;
+	}
       else if (unformat (input, "disable"))
-	is_en = 0;
+	{
+	  args.rt_engine_type = RT_BACKEND_ENGINE_DISABLE;
+	  args.is_en = 0;
+	}
       else
 	return clib_error_return (0, "unknown input `%U'",
 				  format_unformat_error, input);
     }
 
-  if (is_en > 1)
-    return clib_error_return (0, "expected enable | disable");
+  if (smm->is_enabled && args.is_en)
+    if (args.rt_engine_type != smm->rt_engine_type)
+      return clib_error_return (
+	0, "session is already enable. Must disable first");
 
-  return vnet_session_enable_disable (vm, is_en);
+  return vnet_session_enable_disable (vm, &args);
 }
 
-VLIB_CLI_COMMAND (session_enable_disable_command, static) =
-{
+VLIB_CLI_COMMAND (session_enable_disable_command, static) = {
   .path = "session",
-  .short_help = "session [enable|disable]",
+  .short_help =
+    "session { enable [ rt-backend sdl | rule-table ] } | { disable }",
   .function = session_enable_disable_fn,
 };