qca-nss-drv/nss_l2tpv2.c - manifest_repos/sdk - Git at Google

 /*
  **************************************************************************
  * Copyright (c) 2015-2020, The Linux Foundation. All rights reserved.
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
  * above copyright notice and this permission notice appear in all copies.
  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  **************************************************************************
  */

 #include <linux/l2tp.h>
 #include <net/sock.h>
 #include "nss_tx_rx_common.h"
 #include "nss_l2tpv2_stats.h"
 #include "nss_l2tpv2_log.h"
 #include "nss_l2tpv2_strings.h"

 /*
  * Data structures to store l2tpv2 nss debug stats
  */
 static DEFINE_SPINLOCK(nss_l2tpv2_session_debug_stats_lock);
 static struct nss_l2tpv2_stats_session_debug  nss_l2tpv2_session_debug_stats[NSS_MAX_L2TPV2_DYNAMIC_INTERFACES];

 /*
  * nss_l2tpv2_session_debug_stats_sync
  *	Per session debug stats for l2tpv2
  */
 void nss_l2tpv2_session_debug_stats_sync(struct nss_ctx_instance *nss_ctx, struct nss_l2tpv2_sync_session_stats_msg *stats_msg, uint16_t if_num)
 {
 	int i;
 	spin_lock_bh(&nss_l2tpv2_session_debug_stats_lock);
 	for (i = 0; i < NSS_MAX_L2TPV2_DYNAMIC_INTERFACES; i++) {
 		if (nss_l2tpv2_session_debug_stats[i].if_num == if_num) {
 			nss_l2tpv2_session_debug_stats[i].stats[NSS_L2TPV2_STATS_SESSION_RX_PPP_LCP_PKTS] += stats_msg->debug_stats.rx_ppp_lcp_pkts;
 			nss_l2tpv2_session_debug_stats[i].stats[NSS_L2TPV2_STATS_SESSION_RX_EXP_DATA_PKTS] += stats_msg->debug_stats.rx_exception_data_pkts;
 			nss_l2tpv2_session_debug_stats[i].stats[NSS_L2TPV2_STATS_SESSION_ENCAP_PBUF_ALLOC_FAIL_PKTS] += stats_msg->debug_stats.encap_pbuf_alloc_fail;
 			nss_l2tpv2_session_debug_stats[i].stats[NSS_L2TPV2_STATS_SESSION_DECAP_PBUF_ALLOC_FAIL_PKTS] += stats_msg->debug_stats.decap_pbuf_alloc_fail;
 			nss_l2tpv2_session_debug_stats[i].stats[NSS_L2TPV2_STATS_SESSION_DECAP_L2TPOIPSEC_SRC_ERR] += stats_msg->debug_stats.decap_l2tpoipsec_src_error;
 			break;
 		}
 	}
 	spin_unlock_bh(&nss_l2tpv2_session_debug_stats_lock);
 }

 /*
  * nss_l2tpv2_global_session_stats_get()
  *	Get session l2tpv2 statitics.
  */
 void nss_l2tpv2_session_debug_stats_get(void *stats_mem)
 {
 	struct nss_l2tpv2_stats_session_debug *stats = (struct nss_l2tpv2_stats_session_debug *)stats_mem;
 	int i;

 	if (!stats) {
 		nss_warning("No memory to copy l2tpv2 session stats");
 		return;
 	}

 	spin_lock_bh(&nss_l2tpv2_session_debug_stats_lock);
 	for (i = 0; i < NSS_MAX_L2TPV2_DYNAMIC_INTERFACES; i++) {
 		if (nss_l2tpv2_session_debug_stats[i].valid) {
 			memcpy(stats, &nss_l2tpv2_session_debug_stats[i], sizeof(struct nss_l2tpv2_stats_session_debug));
 			stats++;
 		}
 	}
 	spin_unlock_bh(&nss_l2tpv2_session_debug_stats_lock);
 }

 /*
  * nss_l2tpv2_handler()
  *	Handle NSS -> HLOS messages for l2tpv2 tunnel
  */

 static void nss_l2tpv2_handler(struct nss_ctx_instance *nss_ctx, struct nss_cmn_msg *ncm, __attribute__((unused))void *app_data)
 {
 	struct nss_l2tpv2_msg *ntm = (struct nss_l2tpv2_msg *)ncm;
 	void *ctx;

 	nss_l2tpv2_msg_callback_t cb;

 	BUG_ON(!(nss_is_dynamic_interface(ncm->interface) || ncm->interface == NSS_L2TPV2_INTERFACE));

 	/*
 	 * Trace Messages
 	 */
 	nss_l2tpv2_log_rx_msg(ntm);

 	/*
 	 * Is this a valid request/response packet?
 	 */
 	if (ncm->type >= NSS_L2TPV2_MSG_MAX) {
 		nss_warning("%px: received invalid message %d for L2TP interface", nss_ctx, ncm->type);
 		return;
 	}

 	if (nss_cmn_get_msg_len(ncm) > sizeof(struct nss_l2tpv2_msg)) {
 		nss_warning("%px: message length is invalid: %d", nss_ctx, nss_cmn_get_msg_len(ncm));
 		return;
 	}

 	switch (ntm->cm.type) {

 	case NSS_L2TPV2_MSG_SYNC_STATS:
 		/*
 		 * Update session debug stats in session stats msg and send statistics notifications to the registered modules
 		 */
 		nss_l2tpv2_session_debug_stats_sync(nss_ctx, &ntm->msg.stats, ncm->interface);
 		nss_l2tpv2_stats_notify(nss_ctx, ncm->interface);
 		break;
 	}

 	/*
 	 * Update the callback and app_data for NOTIFY messages, l2tpv2 sends all notify messages
 	 * to the same callback/app_data.
 	 */
 	if (ncm->response == NSS_CMN_RESPONSE_NOTIFY) {
 		ncm->cb = (nss_ptr_t)nss_ctx->nss_top->l2tpv2_msg_callback;
 	}

 	/*
 	 * Log failures
 	 */
 	nss_core_log_msg_failures(nss_ctx, ncm);

 	/*
 	 * Do we have a call back
 	 */
 	if (!ncm->cb) {
 		return;
 	}

 	/*
 	 * callback
 	 */
 	cb = (nss_l2tpv2_msg_callback_t)ncm->cb;
 	ctx = nss_ctx->subsys_dp_register[ncm->interface].ndev;

 	/*
 	 * call l2tpv2 tunnel callback
 	 */
 	if (!ctx) {
 		nss_warning("%px: Event received for l2tpv2 tunnel interface %d before registration", nss_ctx, ncm->interface);
 		return;
 	}

 	cb(ctx, ntm);
 }

 /*
  * nss_l2tpv2_tx()
  *	Transmit a l2tpv2 message to NSS firmware
  */
 nss_tx_status_t nss_l2tpv2_tx(struct nss_ctx_instance *nss_ctx, struct nss_l2tpv2_msg *msg)
 {
 	struct nss_cmn_msg *ncm = &msg->cm;

 	/*
 	 * Trace Messages
 	 */
 	nss_l2tpv2_log_tx_msg(msg);

 	/*
 	 * Sanity check the message
 	 */
 	if (!nss_is_dynamic_interface(ncm->interface)) {
 		nss_warning("%px: tx request for non dynamic interface: %d", nss_ctx, ncm->interface);
 		return NSS_TX_FAILURE;
 	}

 	if (ncm->type > NSS_L2TPV2_MSG_MAX) {
 		nss_warning("%px: message type out of range: %d", nss_ctx, ncm->type);
 		return NSS_TX_FAILURE;
 	}

 	return nss_core_send_cmd(nss_ctx, msg, sizeof(*msg), NSS_NBUF_PAYLOAD_SIZE);
 }

 /*
  ***********************************
  * Register/Unregister/Miscellaneous APIs
  ***********************************
  */

 /*
  * nss_register_l2tpv2_if()
  */
 struct nss_ctx_instance *nss_register_l2tpv2_if(uint32_t if_num, nss_l2tpv2_callback_t l2tpv2_callback,
 			nss_l2tpv2_msg_callback_t event_callback, struct net_device *netdev, uint32_t features)
 {
 	struct nss_ctx_instance *nss_ctx = (struct nss_ctx_instance *)&nss_top_main.nss[nss_top_main.l2tpv2_handler_id];
 	int i = 0;

 	nss_assert(nss_ctx);
 	nss_assert(nss_is_dynamic_interface(if_num));

 	nss_core_register_subsys_dp(nss_ctx, if_num, l2tpv2_callback, NULL, NULL, netdev, features);

 	nss_top_main.l2tpv2_msg_callback = event_callback;

 	nss_core_register_handler(nss_ctx, if_num, nss_l2tpv2_handler, NULL);

 	spin_lock_bh(&nss_l2tpv2_session_debug_stats_lock);
 	for (i = 0; i < NSS_MAX_L2TPV2_DYNAMIC_INTERFACES; i++) {
 		if (!nss_l2tpv2_session_debug_stats[i].valid) {
 			nss_l2tpv2_session_debug_stats[i].valid = true;
 			nss_l2tpv2_session_debug_stats[i].if_num = if_num;
 			nss_l2tpv2_session_debug_stats[i].if_index = netdev->ifindex;
 			break;
 		}
 	}
 	spin_unlock_bh(&nss_l2tpv2_session_debug_stats_lock);

 	return nss_ctx;
 }

 /*
  * nss_unregister_l2tpv2_if()
  */
 void nss_unregister_l2tpv2_if(uint32_t if_num)
 {
 	struct nss_ctx_instance *nss_ctx = (struct nss_ctx_instance *)&nss_top_main.nss[nss_top_main.l2tpv2_handler_id];
 	int i;

 	nss_assert(nss_ctx);
 	nss_assert(nss_is_dynamic_interface(if_num));

 	nss_core_unregister_subsys_dp(nss_ctx, if_num);

 	nss_top_main.l2tpv2_msg_callback = NULL;

 	nss_core_unregister_handler(nss_ctx, if_num);

 	spin_lock_bh(&nss_l2tpv2_session_debug_stats_lock);
 	for (i = 0; i < NSS_MAX_L2TPV2_DYNAMIC_INTERFACES; i++) {
 		if (nss_l2tpv2_session_debug_stats[i].if_num == if_num) {
 			memset(&nss_l2tpv2_session_debug_stats[i], 0, sizeof(struct nss_l2tpv2_stats_session_debug));
 			break;
 		}
 	}
 	spin_unlock_bh(&nss_l2tpv2_session_debug_stats_lock);
 }

 /*
  * nss_get_l2tpv2_context()
  */
 struct nss_ctx_instance *nss_l2tpv2_get_context()
 {
 	return (struct nss_ctx_instance *)&nss_top_main.nss[nss_top_main.l2tpv2_handler_id];
 }

 /*
  * nss_l2tpv2_msg_init()
  *	Initialize nss_l2tpv2 msg.
  */
 void nss_l2tpv2_msg_init(struct nss_l2tpv2_msg *ncm, uint16_t if_num, uint32_t type,  uint32_t len, void *cb, void *app_data)
 {
 	nss_cmn_msg_init(&ncm->cm, if_num, type, len, cb, app_data);
 }

 /* nss_l2tpv2_register_handler()
  *   debugfs stats msg handler received on static l2tpv2 interface
  */
 void nss_l2tpv2_register_handler(void)
 {
 	struct nss_ctx_instance *nss_ctx = nss_l2tpv2_get_context();

 	nss_info("nss_l2tpv2_register_handler");
 	nss_core_register_handler(nss_ctx, NSS_L2TPV2_INTERFACE, nss_l2tpv2_handler, NULL);

 	nss_l2tpv2_stats_dentry_create();
 	nss_l2tpv2_strings_dentry_create();
 }

 EXPORT_SYMBOL(nss_l2tpv2_get_context);
 EXPORT_SYMBOL(nss_l2tpv2_tx);
 EXPORT_SYMBOL(nss_unregister_l2tpv2_if);
 EXPORT_SYMBOL(nss_l2tpv2_msg_init);
 EXPORT_SYMBOL(nss_register_l2tpv2_if);
	/*
	**************************************************************************
	* Copyright (c) 2015-2020, The Linux Foundation. All rights reserved.
	* Permission to use, copy, modify, and/or distribute this software for
	* any purpose with or without fee is hereby granted, provided that the
	* above copyright notice and this permission notice appear in all copies.
	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
	* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	**************************************************************************
	*/

	#include <linux/l2tp.h>
	#include <net/sock.h>
	#include "nss_tx_rx_common.h"
	#include "nss_l2tpv2_stats.h"
	#include "nss_l2tpv2_log.h"
	#include "nss_l2tpv2_strings.h"

	/*
	* Data structures to store l2tpv2 nss debug stats
	*/
	static DEFINE_SPINLOCK(nss_l2tpv2_session_debug_stats_lock);
	static struct nss_l2tpv2_stats_session_debug nss_l2tpv2_session_debug_stats[NSS_MAX_L2TPV2_DYNAMIC_INTERFACES];

	/*
	* nss_l2tpv2_session_debug_stats_sync
	* Per session debug stats for l2tpv2
	*/
	void nss_l2tpv2_session_debug_stats_sync(struct nss_ctx_instance nss_ctx, struct nss_l2tpv2_sync_session_stats_msg stats_msg, uint16_t if_num)
	{
	int i;
	spin_lock_bh(&nss_l2tpv2_session_debug_stats_lock);
	for (i = 0; i < NSS_MAX_L2TPV2_DYNAMIC_INTERFACES; i++) {
	if (nss_l2tpv2_session_debug_stats[i].if_num == if_num) {
	nss_l2tpv2_session_debug_stats[i].stats[NSS_L2TPV2_STATS_SESSION_RX_PPP_LCP_PKTS] += stats_msg->debug_stats.rx_ppp_lcp_pkts;
	nss_l2tpv2_session_debug_stats[i].stats[NSS_L2TPV2_STATS_SESSION_RX_EXP_DATA_PKTS] += stats_msg->debug_stats.rx_exception_data_pkts;
	nss_l2tpv2_session_debug_stats[i].stats[NSS_L2TPV2_STATS_SESSION_ENCAP_PBUF_ALLOC_FAIL_PKTS] += stats_msg->debug_stats.encap_pbuf_alloc_fail;
	nss_l2tpv2_session_debug_stats[i].stats[NSS_L2TPV2_STATS_SESSION_DECAP_PBUF_ALLOC_FAIL_PKTS] += stats_msg->debug_stats.decap_pbuf_alloc_fail;
	nss_l2tpv2_session_debug_stats[i].stats[NSS_L2TPV2_STATS_SESSION_DECAP_L2TPOIPSEC_SRC_ERR] += stats_msg->debug_stats.decap_l2tpoipsec_src_error;
	break;
	}
	}
	spin_unlock_bh(&nss_l2tpv2_session_debug_stats_lock);
	}

	/*
	* nss_l2tpv2_global_session_stats_get()
	* Get session l2tpv2 statitics.
	*/
	void nss_l2tpv2_session_debug_stats_get(void *stats_mem)
	{
	struct nss_l2tpv2_stats_session_debug stats = (struct nss_l2tpv2_stats_session_debug )stats_mem;
	int i;

	if (!stats) {
	nss_warning("No memory to copy l2tpv2 session stats");
	return;
	}

	spin_lock_bh(&nss_l2tpv2_session_debug_stats_lock);
	for (i = 0; i < NSS_MAX_L2TPV2_DYNAMIC_INTERFACES; i++) {
	if (nss_l2tpv2_session_debug_stats[i].valid) {
	memcpy(stats, &nss_l2tpv2_session_debug_stats[i], sizeof(struct nss_l2tpv2_stats_session_debug));
	stats++;
	}
	}
	spin_unlock_bh(&nss_l2tpv2_session_debug_stats_lock);
	}

	/*
	* nss_l2tpv2_handler()
	* Handle NSS -> HLOS messages for l2tpv2 tunnel
	*/

	static void nss_l2tpv2_handler(struct nss_ctx_instance nss_ctx, struct nss_cmn_msg ncm, __attribute__((unused))void *app_data)
	{
	struct nss_l2tpv2_msg ntm = (struct nss_l2tpv2_msg )ncm;
	void *ctx;

	nss_l2tpv2_msg_callback_t cb;

	BUG_ON(!(nss_is_dynamic_interface(ncm->interface) \|\| ncm->interface == NSS_L2TPV2_INTERFACE));

	/*
	* Trace Messages
	*/
	nss_l2tpv2_log_rx_msg(ntm);

	/*
	* Is this a valid request/response packet?
	*/
	if (ncm->type >= NSS_L2TPV2_MSG_MAX) {
	nss_warning("%px: received invalid message %d for L2TP interface", nss_ctx, ncm->type);
	return;
	}

	if (nss_cmn_get_msg_len(ncm) > sizeof(struct nss_l2tpv2_msg)) {
	nss_warning("%px: message length is invalid: %d", nss_ctx, nss_cmn_get_msg_len(ncm));
	return;
	}

	switch (ntm->cm.type) {

	case NSS_L2TPV2_MSG_SYNC_STATS:
	/*
	* Update session debug stats in session stats msg and send statistics notifications to the registered modules
	*/
	nss_l2tpv2_session_debug_stats_sync(nss_ctx, &ntm->msg.stats, ncm->interface);
	nss_l2tpv2_stats_notify(nss_ctx, ncm->interface);
	break;
	}

	/*
	* Update the callback and app_data for NOTIFY messages, l2tpv2 sends all notify messages
	* to the same callback/app_data.
	*/
	if (ncm->response == NSS_CMN_RESPONSE_NOTIFY) {
	ncm->cb = (nss_ptr_t)nss_ctx->nss_top->l2tpv2_msg_callback;
	}

	/*
	* Log failures
	*/
	nss_core_log_msg_failures(nss_ctx, ncm);

	/*
	* Do we have a call back
	*/
	if (!ncm->cb) {
	return;
	}

	/*
	* callback
	*/
	cb = (nss_l2tpv2_msg_callback_t)ncm->cb;
	ctx = nss_ctx->subsys_dp_register[ncm->interface].ndev;

	/*
	* call l2tpv2 tunnel callback
	*/
	if (!ctx) {
	nss_warning("%px: Event received for l2tpv2 tunnel interface %d before registration", nss_ctx, ncm->interface);
	return;
	}

	cb(ctx, ntm);
	}

	/*
	* nss_l2tpv2_tx()
	* Transmit a l2tpv2 message to NSS firmware
	*/
	nss_tx_status_t nss_l2tpv2_tx(struct nss_ctx_instance nss_ctx, struct nss_l2tpv2_msg msg)
	{
	struct nss_cmn_msg *ncm = &msg->cm;

	/*
	* Trace Messages
	*/
	nss_l2tpv2_log_tx_msg(msg);

	/*
	* Sanity check the message
	*/
	if (!nss_is_dynamic_interface(ncm->interface)) {
	nss_warning("%px: tx request for non dynamic interface: %d", nss_ctx, ncm->interface);
	return NSS_TX_FAILURE;
	}

	if (ncm->type > NSS_L2TPV2_MSG_MAX) {
	nss_warning("%px: message type out of range: %d", nss_ctx, ncm->type);
	return NSS_TX_FAILURE;
	}

	return nss_core_send_cmd(nss_ctx, msg, sizeof(*msg), NSS_NBUF_PAYLOAD_SIZE);
	}

	/*
	***********************************
	* Register/Unregister/Miscellaneous APIs
	***********************************
	*/

	/*
	* nss_register_l2tpv2_if()
	*/
	struct nss_ctx_instance *nss_register_l2tpv2_if(uint32_t if_num, nss_l2tpv2_callback_t l2tpv2_callback,
	nss_l2tpv2_msg_callback_t event_callback, struct net_device *netdev, uint32_t features)
	{
	struct nss_ctx_instance nss_ctx = (struct nss_ctx_instance )&nss_top_main.nss[nss_top_main.l2tpv2_handler_id];
	int i = 0;

	nss_assert(nss_ctx);
	nss_assert(nss_is_dynamic_interface(if_num));

	nss_core_register_subsys_dp(nss_ctx, if_num, l2tpv2_callback, NULL, NULL, netdev, features);

	nss_top_main.l2tpv2_msg_callback = event_callback;

	nss_core_register_handler(nss_ctx, if_num, nss_l2tpv2_handler, NULL);

	spin_lock_bh(&nss_l2tpv2_session_debug_stats_lock);
	for (i = 0; i < NSS_MAX_L2TPV2_DYNAMIC_INTERFACES; i++) {
	if (!nss_l2tpv2_session_debug_stats[i].valid) {
	nss_l2tpv2_session_debug_stats[i].valid = true;
	nss_l2tpv2_session_debug_stats[i].if_num = if_num;
	nss_l2tpv2_session_debug_stats[i].if_index = netdev->ifindex;
	break;
	}
	}
	spin_unlock_bh(&nss_l2tpv2_session_debug_stats_lock);

	return nss_ctx;
	}

	/*
	* nss_unregister_l2tpv2_if()
	*/
	void nss_unregister_l2tpv2_if(uint32_t if_num)
	{
	struct nss_ctx_instance nss_ctx = (struct nss_ctx_instance )&nss_top_main.nss[nss_top_main.l2tpv2_handler_id];
	int i;

	nss_assert(nss_ctx);
	nss_assert(nss_is_dynamic_interface(if_num));

	nss_core_unregister_subsys_dp(nss_ctx, if_num);

	nss_top_main.l2tpv2_msg_callback = NULL;

	nss_core_unregister_handler(nss_ctx, if_num);

	spin_lock_bh(&nss_l2tpv2_session_debug_stats_lock);
	for (i = 0; i < NSS_MAX_L2TPV2_DYNAMIC_INTERFACES; i++) {
	if (nss_l2tpv2_session_debug_stats[i].if_num == if_num) {
	memset(&nss_l2tpv2_session_debug_stats[i], 0, sizeof(struct nss_l2tpv2_stats_session_debug));
	break;
	}
	}
	spin_unlock_bh(&nss_l2tpv2_session_debug_stats_lock);
	}

	/*
	* nss_get_l2tpv2_context()
	*/
	struct nss_ctx_instance *nss_l2tpv2_get_context()
	{
	return (struct nss_ctx_instance *)&nss_top_main.nss[nss_top_main.l2tpv2_handler_id];
	}

	/*
	* nss_l2tpv2_msg_init()
	* Initialize nss_l2tpv2 msg.
	*/
	void nss_l2tpv2_msg_init(struct nss_l2tpv2_msg ncm, uint16_t if_num, uint32_t type, uint32_t len, void cb, void *app_data)
	{
	nss_cmn_msg_init(&ncm->cm, if_num, type, len, cb, app_data);
	}

	/* nss_l2tpv2_register_handler()
	* debugfs stats msg handler received on static l2tpv2 interface
	*/
	void nss_l2tpv2_register_handler(void)
	{
	struct nss_ctx_instance *nss_ctx = nss_l2tpv2_get_context();

	nss_info("nss_l2tpv2_register_handler");
	nss_core_register_handler(nss_ctx, NSS_L2TPV2_INTERFACE, nss_l2tpv2_handler, NULL);

	nss_l2tpv2_stats_dentry_create();
	nss_l2tpv2_strings_dentry_create();
	}

	EXPORT_SYMBOL(nss_l2tpv2_get_context);
	EXPORT_SYMBOL(nss_l2tpv2_tx);
	EXPORT_SYMBOL(nss_unregister_l2tpv2_if);
	EXPORT_SYMBOL(nss_l2tpv2_msg_init);
	EXPORT_SYMBOL(nss_register_l2tpv2_if);