[linux.git] / net / xfrm / xfrm_device.c

/*
 * xfrm_device.c - IPsec device offloading code.
 *
 * Copyright (c) 2015 secunet Security Networks AG
 *
 * Author:
 * Steffen Klassert <[email protected]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/errno.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <net/dst.h>
#include <net/xfrm.h>
#include <linux/notifier.h>

#ifdef CONFIG_XFRM_OFFLOAD
struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
{
	int err;
	unsigned long flags;
	struct xfrm_state *x;
	struct sk_buff *skb2;
	struct softnet_data *sd;
	netdev_features_t esp_features = features;
	struct xfrm_offload *xo = xfrm_offload(skb);
	struct sec_path *sp;

	if (!xo)
		return skb;

	if (!(features & NETIF_F_HW_ESP))
		esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK);

	sp = skb_sec_path(skb);
	x = sp->xvec[sp->len - 1];
	if (xo->flags & XFRM_GRO || x->xso.flags & XFRM_OFFLOAD_INBOUND)
		return skb;

	local_irq_save(flags);
	sd = this_cpu_ptr(&softnet_data);
	err = !skb_queue_empty(&sd->xfrm_backlog);
	local_irq_restore(flags);

	if (err) {
		*again = true;
		return skb;
	}

	if (skb_is_gso(skb)) {
		struct net_device *dev = skb->dev;

		if (unlikely(x->xso.dev != dev)) {
			struct sk_buff *segs;

			/* Packet got rerouted, fixup features and segment it. */
			esp_features = esp_features & ~(NETIF_F_HW_ESP
							| NETIF_F_GSO_ESP);

			segs = skb_gso_segment(skb, esp_features);
			if (IS_ERR(segs)) {
				kfree_skb(skb);
				atomic_long_inc(&dev->tx_dropped);
				return NULL;
			} else {
				consume_skb(skb);
				skb = segs;
			}
		}
	}

	if (!skb->next) {
		x->outer_mode->xmit(x, skb);

		xo->flags |= XFRM_DEV_RESUME;

		err = x->type_offload->xmit(x, skb, esp_features);
		if (err) {
			if (err == -EINPROGRESS)
				return NULL;

			XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
			kfree_skb(skb);
			return NULL;
		}

		skb_push(skb, skb->data - skb_mac_header(skb));

		return skb;
	}

	skb2 = skb;

	do {
		struct sk_buff *nskb = skb2->next;
		skb_mark_not_on_list(skb2);

		xo = xfrm_offload(skb2);
		xo->flags |= XFRM_DEV_RESUME;

		x->outer_mode->xmit(x, skb2);

		err = x->type_offload->xmit(x, skb2, esp_features);
		if (!err) {
			skb2->next = nskb;
		} else if (err != -EINPROGRESS) {
			XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
			skb2->next = nskb;
			kfree_skb_list(skb2);
			return NULL;
		} else {
			if (skb == skb2)
				skb = nskb;

			if (!skb)
				return NULL;

			goto skip_push;
		}

		skb_push(skb2, skb2->data - skb_mac_header(skb2));

skip_push:
		skb2 = nskb;
	} while (skb2);

	return skb;
}
EXPORT_SYMBOL_GPL(validate_xmit_xfrm);

int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
		       struct xfrm_user_offload *xuo)
{
	int err;
	struct dst_entry *dst;
	struct net_device *dev;
	struct xfrm_state_offload *xso = &x->xso;
	xfrm_address_t *saddr;
	xfrm_address_t *daddr;

	if (!x->type_offload)
		return -EINVAL;

	/* We don't yet support UDP encapsulation and TFC padding. */
	if (x->encap || x->tfcpad)
		return -EINVAL;

	dev = dev_get_by_index(net, xuo->ifindex);
	if (!dev) {
		if (!(xuo->flags & XFRM_OFFLOAD_INBOUND)) {
			saddr = &x->props.saddr;
			daddr = &x->id.daddr;
		} else {
			saddr = &x->id.daddr;
			daddr = &x->props.saddr;
		}

		dst = __xfrm_dst_lookup(net, 0, 0, saddr, daddr,
					x->props.family,
					xfrm_smark_get(0, x));
		if (IS_ERR(dst))
			return 0;

		dev = dst->dev;

		dev_hold(dev);
		dst_release(dst);
	}

	if (!dev->xfrmdev_ops || !dev->xfrmdev_ops->xdo_dev_state_add) {
		xso->dev = NULL;
		dev_put(dev);
		return 0;
	}

	if (x->props.flags & XFRM_STATE_ESN &&
	    !dev->xfrmdev_ops->xdo_dev_state_advance_esn) {
		xso->dev = NULL;
		dev_put(dev);
		return -EINVAL;
	}

	xso->dev = dev;
	xso->num_exthdrs = 1;
	xso->flags = xuo->flags;

	err = dev->xfrmdev_ops->xdo_dev_state_add(x);
	if (err) {
		xso->num_exthdrs = 0;
		xso->flags = 0;
		xso->dev = NULL;
		dev_put(dev);

		if (err != -EOPNOTSUPP)
			return err;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(xfrm_dev_state_add);

bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
{
	int mtu;
	struct dst_entry *dst = skb_dst(skb);
	struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
	struct net_device *dev = x->xso.dev;

	if (!x->type_offload || x->encap)
		return false;

	if ((!dev || (dev == xfrm_dst_path(dst)->dev)) &&
	    (!xdst->child->xfrm && x->type->get_mtu)) {
		mtu = x->type->get_mtu(x, xdst->child_mtu_cached);

		if (skb->len <= mtu)
			goto ok;

		if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu))
			goto ok;
	}

	return false;

ok:
	if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_offload_ok)
		return x->xso.dev->xfrmdev_ops->xdo_dev_offload_ok(skb, x);

	return true;
}
EXPORT_SYMBOL_GPL(xfrm_dev_offload_ok);

void xfrm_dev_resume(struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
	int ret = NETDEV_TX_BUSY;
	struct netdev_queue *txq;
	struct softnet_data *sd;
	unsigned long flags;

	rcu_read_lock();
	txq = netdev_pick_tx(dev, skb, NULL);

	HARD_TX_LOCK(dev, txq, smp_processor_id());
	if (!netif_xmit_frozen_or_stopped(txq))
		skb = dev_hard_start_xmit(skb, dev, txq, &ret);
	HARD_TX_UNLOCK(dev, txq);

	if (!dev_xmit_complete(ret)) {
		local_irq_save(flags);
		sd = this_cpu_ptr(&softnet_data);
		skb_queue_tail(&sd->xfrm_backlog, skb);
		raise_softirq_irqoff(NET_TX_SOFTIRQ);
		local_irq_restore(flags);
	}
	rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(xfrm_dev_resume);

void xfrm_dev_backlog(struct softnet_data *sd)
{
	struct sk_buff_head *xfrm_backlog = &sd->xfrm_backlog;
	struct sk_buff_head list;
	struct sk_buff *skb;

	if (skb_queue_empty(xfrm_backlog))
		return;

	__skb_queue_head_init(&list);

	spin_lock(&xfrm_backlog->lock);
	skb_queue_splice_init(xfrm_backlog, &list);
	spin_unlock(&xfrm_backlog->lock);

	while (!skb_queue_empty(&list)) {
		skb = __skb_dequeue(&list);
		xfrm_dev_resume(skb);
	}

}
#endif

static int xfrm_api_check(struct net_device *dev)
{
#ifdef CONFIG_XFRM_OFFLOAD
	if ((dev->features & NETIF_F_HW_ESP_TX_CSUM) &&
	    !(dev->features & NETIF_F_HW_ESP))
		return NOTIFY_BAD;

	if ((dev->features & NETIF_F_HW_ESP) &&
	    (!(dev->xfrmdev_ops &&
	       dev->xfrmdev_ops->xdo_dev_state_add &&
	       dev->xfrmdev_ops->xdo_dev_state_delete)))
		return NOTIFY_BAD;
#else
	if (dev->features & (NETIF_F_HW_ESP | NETIF_F_HW_ESP_TX_CSUM))
		return NOTIFY_BAD;
#endif

	return NOTIFY_DONE;
}

static int xfrm_dev_register(struct net_device *dev)
{
	return xfrm_api_check(dev);
}

static int xfrm_dev_feat_change(struct net_device *dev)
{
	return xfrm_api_check(dev);
}

static int xfrm_dev_down(struct net_device *dev)
{
	if (dev->features & NETIF_F_HW_ESP)
		xfrm_dev_state_flush(dev_net(dev), dev, true);

	return NOTIFY_DONE;
}

static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
{
	struct net_device *dev = netdev_notifier_info_to_dev(ptr);

	switch (event) {
	case NETDEV_REGISTER:
		return xfrm_dev_register(dev);

	case NETDEV_FEAT_CHANGE:
		return xfrm_dev_feat_change(dev);

	case NETDEV_DOWN:
		return xfrm_dev_down(dev);
	}
	return NOTIFY_DONE;
}

static struct notifier_block xfrm_dev_notifier = {
	.notifier_call	= xfrm_dev_event,
};

void __init xfrm_dev_init(void)
{
	register_netdevice_notifier(&xfrm_dev_notifier);
}
Commit	Line	Data
21f42cc9 SK	1	/*
	2	* xfrm_device.c - IPsec device offloading code.
	3	*
	4	* Copyright (c) 2015 secunet Security Networks AG
	5	*
	6	* Author:
	7	* Steffen Klassert <[email protected]>
	8	*
	9	* This program is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU General Public License
	11	* as published by the Free Software Foundation; either version
	12	* 2 of the License, or (at your option) any later version.
	13	*/
	14
	15	#include <linux/errno.h>
	16	#include <linux/module.h>
	17	#include <linux/netdevice.h>
	18	#include <linux/skbuff.h>
	19	#include <linux/slab.h>
	20	#include <linux/spinlock.h>
	21	#include <net/dst.h>
	22	#include <net/xfrm.h>
	23	#include <linux/notifier.h>
	24
b81f884a	25	#ifdef CONFIG_XFRM_OFFLOAD
f53c7239	26	struct sk_buff validate_xmit_xfrm(struct sk_buff skb, netdev_features_t features, bool *again)
f6e27114 SK	27	{
f6e27114 SK	28	int err;
f53c7239	29	unsigned long flags;
f6e27114	30	struct xfrm_state *x;
3dca3f38	31	struct sk_buff *skb2;
f53c7239	32	struct softnet_data *sd;
3dca3f38	33	netdev_features_t esp_features = features;
f6e27114	34	struct xfrm_offload *xo = xfrm_offload(skb);
2294be0f	35	struct sec_path *sp;
f6e27114	36
3dca3f38 SK	37	if (!xo)
3dca3f38 SK	38	return skb;
f6e27114	39
3dca3f38 SK	40	if (!(features & NETIF_F_HW_ESP))
3dca3f38 SK	41	esp_features = features & ~(NETIF_F_SG \| NETIF_F_CSUM_MASK);
f6e27114	42
2294be0f FW	43	sp = skb_sec_path(skb);
2294be0f FW	44	x = sp->xvec[sp->len - 1];
3dca3f38 SK	45	if (xo->flags & XFRM_GRO \|\| x->xso.flags & XFRM_OFFLOAD_INBOUND)
	46	return skb;
	47
f53c7239 SK	48	local_irq_save(flags);
	49	sd = this_cpu_ptr(&softnet_data);
	50	err = !skb_queue_empty(&sd->xfrm_backlog);
	51	local_irq_restore(flags);
	52
	53	if (err) {
	54	*again = true;
	55	return skb;
	56	}
	57
3dca3f38 SK	58	if (skb_is_gso(skb)) {
	59	struct net_device *dev = skb->dev;
	60
fcb662de	61	if (unlikely(x->xso.dev != dev)) {
3dca3f38 SK	62	struct sk_buff *segs;
	63
	64	/* Packet got rerouted, fixup features and segment it. */
	65	esp_features = esp_features & ~(NETIF_F_HW_ESP
	66	\| NETIF_F_GSO_ESP);
	67
	68	segs = skb_gso_segment(skb, esp_features);
	69	if (IS_ERR(segs)) {
3dca3f38	70	kfree_skb(skb);
f53c7239	71	atomic_long_inc(&dev->tx_dropped);
3dca3f38 SK	72	return NULL;
	73	} else {
	74	consume_skb(skb);
	75	skb = segs;
	76	}
3dca3f38 SK	77	}
	78	}
	79
	80	if (!skb->next) {
f6e27114 SK	81	x->outer_mode->xmit(x, skb);
f6e27114 SK	82
f53c7239 SK	83	xo->flags \|= XFRM_DEV_RESUME;
f53c7239 SK	84
3dca3f38	85	err = x->type_offload->xmit(x, skb, esp_features);
f6e27114	86	if (err) {
f53c7239 SK	87	if (err == -EINPROGRESS)
	88	return NULL;
	89
f6e27114	90	XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
3dca3f38 SK	91	kfree_skb(skb);
3dca3f38 SK	92	return NULL;
f6e27114 SK	93	}
	94
	95	skb_push(skb, skb->data - skb_mac_header(skb));
3dca3f38 SK	96
3dca3f38 SK	97	return skb;
f6e27114 SK	98	}
f6e27114 SK	99
3dca3f38	100	skb2 = skb;
3dca3f38 SK	101
	102	do {
	103	struct sk_buff *nskb = skb2->next;
a8305bff	104	skb_mark_not_on_list(skb2);
3dca3f38 SK	105
3dca3f38 SK	106	xo = xfrm_offload(skb2);
f53c7239	107	xo->flags \|= XFRM_DEV_RESUME;
3dca3f38 SK	108
	109	x->outer_mode->xmit(x, skb2);
	110
	111	err = x->type_offload->xmit(x, skb2, esp_features);
f53c7239 SK	112	if (!err) {
	113	skb2->next = nskb;
	114	} else if (err != -EINPROGRESS) {
3dca3f38 SK	115	XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
	116	skb2->next = nskb;
	117	kfree_skb_list(skb2);
	118	return NULL;
f53c7239 SK	119	} else {
	120	if (skb == skb2)
	121	skb = nskb;
	122
	123	if (!skb)
	124	return NULL;
3dca3f38	125
f53c7239 SK	126	goto skip_push;
f53c7239 SK	127	}
3dca3f38 SK	128
	129	skb_push(skb2, skb2->data - skb_mac_header(skb2));
	130
f53c7239	131	skip_push:
3dca3f38 SK	132	skb2 = nskb;
	133	} while (skb2);
	134
	135	return skb;
f6e27114 SK	136	}
	137	EXPORT_SYMBOL_GPL(validate_xmit_xfrm);
	138
d77e38e6 SK	139	int xfrm_dev_state_add(struct net net, struct xfrm_state x,
	140	struct xfrm_user_offload *xuo)
	141	{
	142	int err;
	143	struct dst_entry *dst;
	144	struct net_device *dev;
	145	struct xfrm_state_offload *xso = &x->xso;
	146	xfrm_address_t *saddr;
	147	xfrm_address_t *daddr;
	148
	149	if (!x->type_offload)
ffdb5211	150	return -EINVAL;
d77e38e6	151
50bd870a YE	152	/* We don't yet support UDP encapsulation and TFC padding. */
50bd870a YE	153	if (x->encap \|\| x->tfcpad)
43024b9c	154	return -EINVAL;
d77e38e6 SK	155
	156	dev = dev_get_by_index(net, xuo->ifindex);
	157	if (!dev) {
	158	if (!(xuo->flags & XFRM_OFFLOAD_INBOUND)) {
	159	saddr = &x->props.saddr;
	160	daddr = &x->id.daddr;
	161	} else {
	162	saddr = &x->id.daddr;
	163	daddr = &x->props.saddr;
	164	}
	165
077fbac4	166	dst = __xfrm_dst_lookup(net, 0, 0, saddr, daddr,
9b42c1f1 SK	167	x->props.family,
9b42c1f1 SK	168	xfrm_smark_get(0, x));
d77e38e6 SK	169	if (IS_ERR(dst))
	170	return 0;
	171
	172	dev = dst->dev;
	173
	174	dev_hold(dev);
	175	dst_release(dst);
	176	}
	177
	178	if (!dev->xfrmdev_ops \|\| !dev->xfrmdev_ops->xdo_dev_state_add) {
67a63387	179	xso->dev = NULL;
d77e38e6 SK	180	dev_put(dev);
	181	return 0;
	182	}
	183
50bd870a YE	184	if (x->props.flags & XFRM_STATE_ESN &&
	185	!dev->xfrmdev_ops->xdo_dev_state_advance_esn) {
	186	xso->dev = NULL;
	187	dev_put(dev);
	188	return -EINVAL;
	189	}
	190
d77e38e6 SK	191	xso->dev = dev;
	192	xso->num_exthdrs = 1;
	193	xso->flags = xuo->flags;
	194
	195	err = dev->xfrmdev_ops->xdo_dev_state_add(x);
	196	if (err) {
4a132095 SN	197	xso->num_exthdrs = 0;
4a132095 SN	198	xso->flags = 0;
aa5dd6fa	199	xso->dev = NULL;
d77e38e6	200	dev_put(dev);
4a132095 SN	201
	202	if (err != -EOPNOTSUPP)
	203	return err;
d77e38e6 SK	204	}
	205
	206	return 0;
	207	}
	208	EXPORT_SYMBOL_GPL(xfrm_dev_state_add);
	209
	210	bool xfrm_dev_offload_ok(struct sk_buff skb, struct xfrm_state x)
	211	{
	212	int mtu;
	213	struct dst_entry *dst = skb_dst(skb);
	214	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	215	struct net_device *dev = x->xso.dev;
	216
	217	if (!x->type_offload \|\| x->encap)
	218	return false;
	219
fcb662de SN	220	if ((!dev \|\| (dev == xfrm_dst_path(dst)->dev)) &&
fcb662de SN	221	(!xdst->child->xfrm && x->type->get_mtu)) {
d77e38e6 SK	222	mtu = x->type->get_mtu(x, xdst->child_mtu_cached);
	223
	224	if (skb->len <= mtu)
	225	goto ok;
	226
779b7931	227	if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu))
d77e38e6 SK	228	goto ok;
	229	}
	230
	231	return false;
	232
	233	ok:
	234	if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_offload_ok)
	235	return x->xso.dev->xfrmdev_ops->xdo_dev_offload_ok(skb, x);
	236
	237	return true;
	238	}
	239	EXPORT_SYMBOL_GPL(xfrm_dev_offload_ok);
f53c7239 SK	240
	241	void xfrm_dev_resume(struct sk_buff *skb)
	242	{
	243	struct net_device *dev = skb->dev;
	244	int ret = NETDEV_TX_BUSY;
	245	struct netdev_queue *txq;
	246	struct softnet_data *sd;
	247	unsigned long flags;
	248
	249	rcu_read_lock();
	250	txq = netdev_pick_tx(dev, skb, NULL);
	251
	252	HARD_TX_LOCK(dev, txq, smp_processor_id());
	253	if (!netif_xmit_frozen_or_stopped(txq))
	254	skb = dev_hard_start_xmit(skb, dev, txq, &ret);
	255	HARD_TX_UNLOCK(dev, txq);
	256
	257	if (!dev_xmit_complete(ret)) {
	258	local_irq_save(flags);
	259	sd = this_cpu_ptr(&softnet_data);
	260	skb_queue_tail(&sd->xfrm_backlog, skb);
	261	raise_softirq_irqoff(NET_TX_SOFTIRQ);
	262	local_irq_restore(flags);
	263	}
	264	rcu_read_unlock();
	265	}
	266	EXPORT_SYMBOL_GPL(xfrm_dev_resume);
	267
	268	void xfrm_dev_backlog(struct softnet_data *sd)
	269	{
	270	struct sk_buff_head *xfrm_backlog = &sd->xfrm_backlog;
	271	struct sk_buff_head list;
	272	struct sk_buff *skb;
	273
	274	if (skb_queue_empty(xfrm_backlog))
	275	return;
	276
	277	__skb_queue_head_init(&list);
	278
	279	spin_lock(&xfrm_backlog->lock);
	280	skb_queue_splice_init(xfrm_backlog, &list);
	281	spin_unlock(&xfrm_backlog->lock);
	282
	283	while (!skb_queue_empty(&list)) {
	284	skb = __skb_dequeue(&list);
	285	xfrm_dev_resume(skb);
	286	}
	287
	288	}
b81f884a	289	#endif
d77e38e6	290
92a23206	291	static int xfrm_api_check(struct net_device *dev)
d77e38e6	292	{
92a23206	293	#ifdef CONFIG_XFRM_OFFLOAD
d77e38e6 SK	294	if ((dev->features & NETIF_F_HW_ESP_TX_CSUM) &&
	295	!(dev->features & NETIF_F_HW_ESP))
	296	return NOTIFY_BAD;
	297
92a23206 SN	298	if ((dev->features & NETIF_F_HW_ESP) &&
	299	(!(dev->xfrmdev_ops &&
	300	dev->xfrmdev_ops->xdo_dev_state_add &&
	301	dev->xfrmdev_ops->xdo_dev_state_delete)))
	302	return NOTIFY_BAD;
	303	#else
	304	if (dev->features & (NETIF_F_HW_ESP \| NETIF_F_HW_ESP_TX_CSUM))
	305	return NOTIFY_BAD;
	306	#endif
	307
d77e38e6 SK	308	return NOTIFY_DONE;
	309	}
	310
92a23206 SN	311	static int xfrm_dev_register(struct net_device *dev)
	312	{
	313	return xfrm_api_check(dev);
	314	}
	315
d77e38e6 SK	316	static int xfrm_dev_feat_change(struct net_device *dev)
d77e38e6 SK	317	{
92a23206	318	return xfrm_api_check(dev);
d77e38e6 SK	319	}
	320
	321	static int xfrm_dev_down(struct net_device *dev)
	322	{
2c1497bb	323	if (dev->features & NETIF_F_HW_ESP)
d77e38e6 SK	324	xfrm_dev_state_flush(dev_net(dev), dev, true);
d77e38e6 SK	325
d77e38e6 SK	326	return NOTIFY_DONE;
	327	}
	328
21f42cc9 SK	329	static int xfrm_dev_event(struct notifier_block this, unsigned long event, void ptr)
	330	{
	331	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
	332
	333	switch (event) {
d77e38e6 SK	334	case NETDEV_REGISTER:
	335	return xfrm_dev_register(dev);
	336
d77e38e6 SK	337	case NETDEV_FEAT_CHANGE:
	338	return xfrm_dev_feat_change(dev);
	339
21f42cc9	340	case NETDEV_DOWN:
d77e38e6	341	return xfrm_dev_down(dev);
21f42cc9 SK	342	}
	343	return NOTIFY_DONE;
	344	}
	345
	346	static struct notifier_block xfrm_dev_notifier = {
	347	.notifier_call = xfrm_dev_event,
	348	};
	349
e9a441b6	350	void __init xfrm_dev_init(void)
21f42cc9 SK	351	{
	352	register_netdevice_notifier(&xfrm_dev_notifier);
	353	}