ikev2: make liveness params configurable

Introduce new cli for setting liveness check period and max retries for
a peer to consider its partner dead.

  ikev2 set liveness <period-in-seconds> <max-retires>

Type: improvement

Change-Id: Iadae1de245d34fe3ee85e09b570f9df8c401772b
Signed-off-by: Filip Tehlar <ftehlar@cisco.com>

src/plugins/ikev2/ikev2.api

@@ -346,6 +346,22 @@ autoreply define ikev2_profile_set_ipsec_udp_port
   u16 port;
   string name[64];
 };
+
+/** \brief IKEv2: Set liveness parameters
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param period - how often is liveness check performed
+    @param max_retries - max retries for liveness check
+*/
+autoreply define ikev2_profile_set_liveness
+{
+  u32 client_index;
+  u32 context;
+
+  u32 period;
+  u32 max_retries;
+};
+
 /*
  * Local Variables:
  * eval: (c-set-style "gnu")

src/plugins/ikev2/ikev2.c

@@ -29,7 +29,7 @@
 #include <plugins/ikev2/ikev2_priv.h>
 #include <openssl/sha.h>
 
-#define IKEV2_LIVENESS_RETRIES 2
+#define IKEV2_LIVENESS_RETRIES 3
 #define IKEV2_LIVENESS_PERIOD_CHECK 30
 
 ikev2_main_t ikev2_main;
@@ -2309,7 +2309,7 @@ ikev2_init_sa (ikev2_sa_t * sa)
 {
   ikev2_main_t *km = &ikev2_main;
   sa->liveness_period_check =
-    vlib_time_now (km->vlib_main) + IKEV2_LIVENESS_PERIOD_CHECK;
+    vlib_time_now (km->vlib_main) + km->liveness_period;
 }
 
 static uword
@@ -3710,6 +3710,8 @@ ikev2_init (vlib_main_t * vm)
   km->vnet_main = vnet_get_main ();
   km->vlib_main = vm;
 
+  km->liveness_period = IKEV2_LIVENESS_PERIOD_CHECK;
+  km->liveness_max_retries = IKEV2_LIVENESS_RETRIES;
   ikev2_crypto_init (km);
 
   mhash_init_vec_string (&km->profile_index_by_name, sizeof (uword));
@@ -3847,6 +3849,19 @@ ikev2_set_log_level (ikev2_log_level_t log_level)
   return 0;
 }
 
+clib_error_t *
+ikev2_set_liveness_params (u32 period, u32 max_retries)
+{
+  ikev2_main_t *km = &ikev2_main;
+
+  if (period == 0 || max_retries == 0)
+    return clib_error_return (0, "invalid args");
+
+  km->liveness_period = period;
+  km->liveness_max_retries = max_retries;
+  return 0;
+}
+
 static void
 ikev2_mngr_process_ipsec_sa (ipsec_sa_t * ipsec_sa)
 {
@@ -3963,7 +3978,7 @@ ikev2_mngr_process_responder_sas (ikev2_sa_t * sa)
   if (!sa->sk_ai || !sa->sk_ar)
     return 0;
 
-  if (sa->liveness_retries > IKEV2_LIVENESS_RETRIES)
+  if (sa->liveness_retries >= km->liveness_max_retries)
     return 1;
 
   f64 now = vlib_time_now (vm);
@@ -3971,7 +3986,7 @@ ikev2_mngr_process_responder_sas (ikev2_sa_t * sa)
   if (sa->liveness_period_check < now)
     {
       sa->liveness_retries++;
-      sa->liveness_period_check = now + IKEV2_LIVENESS_PERIOD_CHECK;
+      sa->liveness_period_check = now + km->liveness_period;
       ikev2_send_informational_request (sa);
     }
   return 0;

src/plugins/ikev2/ikev2.h

@@ -431,6 +431,8 @@ uword unformat_ikev2_transform_esn_type (unformat_input_t * input,
 					 va_list * args);
 void ikev2_cli_reference (void);
 
+clib_error_t *ikev2_set_liveness_params (u32 period, u32 max_retries);
+
 #endif /* __included_ikev2_h__ */
 
 

src/plugins/ikev2/ikev2_api.c

@@ -61,6 +61,26 @@ vl_api_ikev2_plugin_get_version_t_handler (vl_api_ikev2_plugin_get_version_t *
   vl_api_send_msg (reg, (u8 *) rmp);
 }
 
+static void
+  vl_api_ikev2_profile_set_liveness_t_handler
+  (vl_api_ikev2_profile_set_liveness_t * mp)
+{
+  vl_api_ikev2_profile_set_liveness_reply_t *rmp;
+  int rv = 0;
+
+#if WITH_LIBSSL > 0
+  clib_error_t *error;
+  error = ikev2_set_liveness_params (clib_net_to_host_u32 (mp->period),
+				     clib_net_to_host_u32 (mp->max_retries));
+  if (error)
+    rv = VNET_API_ERROR_UNSPECIFIED;
+#else
+  rv = VNET_API_ERROR_UNIMPLEMENTED;
+#endif
+
+  REPLY_MACRO (VL_API_IKEV2_PROFILE_SET_LIVENESS_REPLY);
+}
+
 static void
 vl_api_ikev2_profile_add_del_t_handler (vl_api_ikev2_profile_add_del_t * mp)
 {

src/plugins/ikev2/ikev2_cli.c

@@ -528,6 +528,45 @@ VLIB_CLI_COMMAND (show_ikev2_profile_command, static) = {
 };
 /* *INDENT-ON* */
 
+static clib_error_t *
+set_ikev2_liveness_period_fn (vlib_main_t * vm,
+			      unformat_input_t * input,
+			      vlib_cli_command_t * cmd)
+{
+  unformat_input_t _line_input, *line_input = &_line_input;
+  clib_error_t *r = 0;
+  u32 period = 0, max_retries = 0;
+
+  if (!unformat_user (input, unformat_line_input, line_input))
+    return 0;
+
+  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (line_input, "%d %d", &period, &max_retries))
+	{
+	  r = ikev2_set_liveness_params (period, max_retries);
+	  goto done;
+	}
+      else
+	break;
+    }
+
+  r = clib_error_return (0, "parse error: '%U'",
+			 format_unformat_error, line_input);
+
+done:
+  unformat_free (line_input);
+  return r;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (set_ikev2_liveness_command, static) = {
+  .path = "ikev2 set liveness",
+  .short_help = "ikev2 set liveness <period> <max-retires>",
+  .function = set_ikev2_liveness_period_fn,
+};
+/* *INDENT-ON* */
+
 static clib_error_t *
 set_ikev2_local_key_command_fn (vlib_main_t * vm,
 				unformat_input_t * input,

src/plugins/ikev2/ikev2_priv.h

@@ -490,6 +490,12 @@ typedef struct
 
   /* custom ipsec-over-udp ports managed by ike */
   uword *udp_ports;
+
+  /* how often a liveness check will be performed */
+  u32 liveness_period;
+
+  /* max number of retries before considering peer dead */
+  u32 liveness_max_retries;
 } ikev2_main_t;
 
 extern ikev2_main_t ikev2_main;

src/plugins/ikev2/ikev2_test.c

@@ -105,6 +105,34 @@ api_ikev2_profile_set_ipsec_udp_port (vat_main_t * vam)
   return 0;
 }
 
+static int
+api_ikev2_profile_set_liveness (vat_main_t * vam)
+{
+  unformat_input_t *i = vam->input;
+  vl_api_ikev2_profile_set_liveness_t *mp;
+  u32 period = 0, max_retries = 0;
+  int ret;
+
+  while (unformat_check_input (i) != UNFORMAT_END_OF_INPUT)
+    {
+      if (!unformat (i, "period %d max-retries %d", &period, &max_retries))
+	{
+	  errmsg ("parse error '%U'", format_unformat_error, i);
+	  return -99;
+	}
+    }
+
+  M (IKEV2_PROFILE_SET_LIVENESS, mp);
+
+  mp->period = clib_host_to_net_u32 (period);
+  mp->max_retries = clib_host_to_net_u32 (max_retries);
+
+  S (mp);
+  W (ret);
+
+  return ret;
+}
+
 static int
 api_ikev2_profile_add_del (vat_main_t * vam)
 {