child-cfg: Make HW offload auto mode configurable

Until now the configuration available to user for HW offload were:
hw_offload = no
hw_offload = yes

With this commit users will be able to configure auto mode using:
hw_offload = auto

Signed-off-by: Adi Nissim <[email protected]>
Reviewed-by: Aviv Heller <[email protected]>

src/libcharon/config/child_cfg.c

@@ -142,6 +142,11 @@ struct private_child_cfg_t {
 	 * anti-replay window size
 	 */
 	uint32_t replay_window;
+
+	/**
+	 * HW offload mode
+	 */
+	hw_offload_t hw_offload;
 };
 
 METHOD(child_cfg_t, get_name, char*,
@@ -467,6 +472,12 @@ METHOD(child_cfg_t, get_start_action, action_t,
 	return this->start_action;
 }
 
+METHOD(child_cfg_t, get_hw_offload, hw_offload_t,
+	private_child_cfg_t *this)
+{
+	return this->hw_offload;
+}
+
 METHOD(child_cfg_t, get_dpd_action, action_t,
 	private_child_cfg_t *this)
 {
@@ -652,6 +663,7 @@ child_cfg_t *child_cfg_create(char *name, child_cfg_create_t *data)
 			.equals = _equals,
 			.get_ref = _get_ref,
 			.destroy = _destroy,
+			.get_hw_offload = _get_hw_offload,
 		},
 		.name = strdup(name),
 		.options = data->options,
@@ -674,6 +686,7 @@ child_cfg_t *child_cfg_create(char *name, child_cfg_create_t *data)
 		.other_ts = linked_list_create(),
 		.replay_window = lib->settings->get_int(lib->settings,
 							"%s.replay_window", DEFAULT_REPLAY_WINDOW, lib->ns),
+		.hw_offload = data->hw_offload,
 	);
 
 	return &this->public;

src/libcharon/config/child_cfg.h

@@ -182,6 +182,13 @@ struct child_cfg_t {
 	 */
 	action_t (*get_dpd_action) (child_cfg_t *this);
 
+	/**
+	 * Get the HW offload mode to use for the CHILD_SA.
+	 *
+	 * @return				hw offload mode
+	 */
+	hw_offload_t (*get_hw_offload) (child_cfg_t *this);
+
 	/**
 	 * Action to take if CHILD_SA gets closed.
 	 *
@@ -305,14 +312,11 @@ enum child_cfg_option_t {
 	/** Install outbound FWD IPsec policies to bypass drop policies */
 	OPT_FWD_OUT_POLICIES = (1<<4),
 
-	/** Enable hardware offload, if supported by the IPsec backend */
-	OPT_HW_OFFLOAD = (1<<5),
-
 	/** Force 96-bit truncation for SHA-256 */
-	OPT_SHA256_96 = (1<<6),
+	OPT_SHA256_96 = (1<<5),
 
 	/** Set mark on inbound SAs */
-	OPT_MARK_IN_SA = (1<<7),
+	OPT_MARK_IN_SA = (1<<6),
 };
 
 /**
@@ -347,6 +351,8 @@ struct child_cfg_create_t {
 	action_t close_action;
 	/** updown script to execute on up/down event (cloned) */
 	char *updown;
+	/** HW offload mode */
+	hw_offload_t hw_offload;
 };
 
 /**