[mirror_ubuntu-jammy-kernel.git] / net / xfrm / xfrm_device.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * xfrm_device.c - IPsec device offloading code.
 *
 * Copyright (c) 2015 secunet Security Networks AG
 *
 * Author:
 * Steffen Klassert <steffen.klassert@secunet.com>
 */

#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
static void __xfrm_transport_prep(struct xfrm_state *x, struct sk_buff *skb,
				  unsigned int hsize)
{
	struct xfrm_offload *xo = xfrm_offload(skb);

	skb_reset_mac_len(skb);
	pskb_pull(skb, skb->mac_len + hsize + x->props.header_len);

	if (xo->flags & XFRM_GSO_SEGMENT) {
		skb_reset_transport_header(skb);
		skb->transport_header -= x->props.header_len;
	}
}

static void __xfrm_mode_tunnel_prep(struct xfrm_state *x, struct sk_buff *skb,
				    unsigned int hsize)

{
	struct xfrm_offload *xo = xfrm_offload(skb);

	if (xo->flags & XFRM_GSO_SEGMENT)
		skb->transport_header = skb->network_header + hsize;

	skb_reset_mac_len(skb);
	pskb_pull(skb, skb->mac_len + x->props.header_len);
}

/* Adjust pointers into the packet when IPsec is done at layer2 */
static void xfrm_outer_mode_prep(struct xfrm_state *x, struct sk_buff *skb)
{
	switch (x->outer_mode.encap) {
	case XFRM_MODE_TUNNEL:
		if (x->outer_mode.family == AF_INET)
			return __xfrm_mode_tunnel_prep(x, skb,
						       sizeof(struct iphdr));
		if (x->outer_mode.family == AF_INET6)
			return __xfrm_mode_tunnel_prep(x, skb,
						       sizeof(struct ipv6hdr));
		break;
	case XFRM_MODE_TRANSPORT:
		if (x->outer_mode.family == AF_INET)
			return __xfrm_transport_prep(x, skb,
						     sizeof(struct iphdr));
		if (x->outer_mode.family == AF_INET6)
			return __xfrm_transport_prep(x, skb,
						     sizeof(struct ipv6hdr));
		break;
	case XFRM_MODE_ROUTEOPTIMIZATION:
	case XFRM_MODE_IN_TRIGGER:
	case XFRM_MODE_BEET:
		break;
	}
}

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) {
		esp_features |= skb->dev->gso_partial_features;
		xfrm_outer_mode_prep(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;

		esp_features |= skb->dev->gso_partial_features;
		skb_mark_not_on_list(skb2);

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

		xfrm_outer_mode_prep(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)) {
		mtu = xfrm_state_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_core_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
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
21f42cc9 SK	2	/*
	3	* xfrm_device.c - IPsec device offloading code.
	4	*
	5	* Copyright (c) 2015 secunet Security Networks AG
	6	*
	7	* Author:
	8	* Steffen Klassert <steffen.klassert@secunet.com>
21f42cc9 SK	9	*/
	10
	11	#include <linux/errno.h>
	12	#include <linux/module.h>
	13	#include <linux/netdevice.h>
	14	#include <linux/skbuff.h>
	15	#include <linux/slab.h>
	16	#include <linux/spinlock.h>
	17	#include <net/dst.h>
	18	#include <net/xfrm.h>
	19	#include <linux/notifier.h>
	20
b81f884a	21	#ifdef CONFIG_XFRM_OFFLOAD
303c5fab FW	22	static void __xfrm_transport_prep(struct xfrm_state x, struct sk_buff skb,
	23	unsigned int hsize)
	24	{
	25	struct xfrm_offload *xo = xfrm_offload(skb);
	26
	27	skb_reset_mac_len(skb);
	28	pskb_pull(skb, skb->mac_len + hsize + x->props.header_len);
	29
	30	if (xo->flags & XFRM_GSO_SEGMENT) {
	31	skb_reset_transport_header(skb);
	32	skb->transport_header -= x->props.header_len;
	33	}
	34	}
	35
	36	static void __xfrm_mode_tunnel_prep(struct xfrm_state x, struct sk_buff skb,
	37	unsigned int hsize)
	38
	39	{
	40	struct xfrm_offload *xo = xfrm_offload(skb);
	41
	42	if (xo->flags & XFRM_GSO_SEGMENT)
	43	skb->transport_header = skb->network_header + hsize;
	44
	45	skb_reset_mac_len(skb);
	46	pskb_pull(skb, skb->mac_len + x->props.header_len);
	47	}
	48
	49	/* Adjust pointers into the packet when IPsec is done at layer2 */
	50	static void xfrm_outer_mode_prep(struct xfrm_state x, struct sk_buff skb)
	51	{
c9500d7b	52	switch (x->outer_mode.encap) {
303c5fab	53	case XFRM_MODE_TUNNEL:
c9500d7b	54	if (x->outer_mode.family == AF_INET)
303c5fab FW	55	return __xfrm_mode_tunnel_prep(x, skb,
303c5fab FW	56	sizeof(struct iphdr));
c9500d7b	57	if (x->outer_mode.family == AF_INET6)
303c5fab FW	58	return __xfrm_mode_tunnel_prep(x, skb,
	59	sizeof(struct ipv6hdr));
	60	break;
	61	case XFRM_MODE_TRANSPORT:
c9500d7b	62	if (x->outer_mode.family == AF_INET)
303c5fab FW	63	return __xfrm_transport_prep(x, skb,
303c5fab FW	64	sizeof(struct iphdr));
c9500d7b	65	if (x->outer_mode.family == AF_INET6)
303c5fab FW	66	return __xfrm_transport_prep(x, skb,
	67	sizeof(struct ipv6hdr));
	68	break;
	69	case XFRM_MODE_ROUTEOPTIMIZATION:
	70	case XFRM_MODE_IN_TRIGGER:
	71	case XFRM_MODE_BEET:
	72	break;
	73	}
	74	}
	75
f53c7239	76	struct sk_buff validate_xmit_xfrm(struct sk_buff skb, netdev_features_t features, bool *again)
f6e27114 SK	77	{
f6e27114 SK	78	int err;
f53c7239	79	unsigned long flags;
f6e27114	80	struct xfrm_state *x;
3dca3f38	81	struct sk_buff *skb2;
f53c7239	82	struct softnet_data *sd;
3dca3f38	83	netdev_features_t esp_features = features;
f6e27114	84	struct xfrm_offload *xo = xfrm_offload(skb);
2294be0f	85	struct sec_path *sp;
f6e27114	86
3dca3f38 SK	87	if (!xo)
3dca3f38 SK	88	return skb;
f6e27114	89
3dca3f38 SK	90	if (!(features & NETIF_F_HW_ESP))
3dca3f38 SK	91	esp_features = features & ~(NETIF_F_SG \| NETIF_F_CSUM_MASK);
f6e27114	92
2294be0f FW	93	sp = skb_sec_path(skb);
2294be0f FW	94	x = sp->xvec[sp->len - 1];
3dca3f38 SK	95	if (xo->flags & XFRM_GRO \|\| x->xso.flags & XFRM_OFFLOAD_INBOUND)
	96	return skb;
	97
f53c7239 SK	98	local_irq_save(flags);
	99	sd = this_cpu_ptr(&softnet_data);
	100	err = !skb_queue_empty(&sd->xfrm_backlog);
	101	local_irq_restore(flags);
	102
	103	if (err) {
	104	*again = true;
	105	return skb;
	106	}
	107
3dca3f38 SK	108	if (skb_is_gso(skb)) {
	109	struct net_device *dev = skb->dev;
	110
fcb662de	111	if (unlikely(x->xso.dev != dev)) {
3dca3f38 SK	112	struct sk_buff *segs;
	113
	114	/* Packet got rerouted, fixup features and segment it. */
	115	esp_features = esp_features & ~(NETIF_F_HW_ESP
	116	\| NETIF_F_GSO_ESP);
	117
	118	segs = skb_gso_segment(skb, esp_features);
	119	if (IS_ERR(segs)) {
3dca3f38	120	kfree_skb(skb);
f53c7239	121	atomic_long_inc(&dev->tx_dropped);
3dca3f38 SK	122	return NULL;
	123	} else {
	124	consume_skb(skb);
	125	skb = segs;
	126	}
3dca3f38 SK	127	}
	128	}
	129
	130	if (!skb->next) {
65fd2c2a	131	esp_features \|= skb->dev->gso_partial_features;
303c5fab	132	xfrm_outer_mode_prep(x, skb);
f6e27114	133
f53c7239 SK	134	xo->flags \|= XFRM_DEV_RESUME;
f53c7239 SK	135
3dca3f38	136	err = x->type_offload->xmit(x, skb, esp_features);
f6e27114	137	if (err) {
f53c7239 SK	138	if (err == -EINPROGRESS)
	139	return NULL;
	140
f6e27114	141	XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
3dca3f38 SK	142	kfree_skb(skb);
3dca3f38 SK	143	return NULL;
f6e27114 SK	144	}
	145
	146	skb_push(skb, skb->data - skb_mac_header(skb));
3dca3f38 SK	147
3dca3f38 SK	148	return skb;
f6e27114 SK	149	}
f6e27114 SK	150
3dca3f38	151	skb2 = skb;
3dca3f38 SK	152
	153	do {
	154	struct sk_buff *nskb = skb2->next;
65fd2c2a BP	155
65fd2c2a BP	156	esp_features \|= skb->dev->gso_partial_features;
a8305bff	157	skb_mark_not_on_list(skb2);
3dca3f38 SK	158
3dca3f38 SK	159	xo = xfrm_offload(skb2);
f53c7239	160	xo->flags \|= XFRM_DEV_RESUME;
3dca3f38	161
303c5fab	162	xfrm_outer_mode_prep(x, skb2);
3dca3f38 SK	163
3dca3f38 SK	164	err = x->type_offload->xmit(x, skb2, esp_features);
f53c7239 SK	165	if (!err) {
	166	skb2->next = nskb;
	167	} else if (err != -EINPROGRESS) {
3dca3f38 SK	168	XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
	169	skb2->next = nskb;
	170	kfree_skb_list(skb2);
	171	return NULL;
f53c7239 SK	172	} else {
	173	if (skb == skb2)
	174	skb = nskb;
	175
	176	if (!skb)
	177	return NULL;
3dca3f38	178
f53c7239 SK	179	goto skip_push;
f53c7239 SK	180	}
3dca3f38 SK	181
	182	skb_push(skb2, skb2->data - skb_mac_header(skb2));
	183
f53c7239	184	skip_push:
3dca3f38 SK	185	skb2 = nskb;
	186	} while (skb2);
	187
	188	return skb;
f6e27114 SK	189	}
	190	EXPORT_SYMBOL_GPL(validate_xmit_xfrm);
	191
d77e38e6 SK	192	int xfrm_dev_state_add(struct net net, struct xfrm_state x,
	193	struct xfrm_user_offload *xuo)
	194	{
	195	int err;
	196	struct dst_entry *dst;
	197	struct net_device *dev;
	198	struct xfrm_state_offload *xso = &x->xso;
	199	xfrm_address_t *saddr;
	200	xfrm_address_t *daddr;
	201
	202	if (!x->type_offload)
ffdb5211	203	return -EINVAL;
d77e38e6	204
50bd870a YE	205	/* We don't yet support UDP encapsulation and TFC padding. */
50bd870a YE	206	if (x->encap \|\| x->tfcpad)
43024b9c	207	return -EINVAL;
d77e38e6 SK	208
	209	dev = dev_get_by_index(net, xuo->ifindex);
	210	if (!dev) {
	211	if (!(xuo->flags & XFRM_OFFLOAD_INBOUND)) {
	212	saddr = &x->props.saddr;
	213	daddr = &x->id.daddr;
	214	} else {
	215	saddr = &x->id.daddr;
	216	daddr = &x->props.saddr;
	217	}
	218
077fbac4	219	dst = __xfrm_dst_lookup(net, 0, 0, saddr, daddr,
9b42c1f1 SK	220	x->props.family,
9b42c1f1 SK	221	xfrm_smark_get(0, x));
d77e38e6 SK	222	if (IS_ERR(dst))
	223	return 0;
	224
	225	dev = dst->dev;
	226
	227	dev_hold(dev);
	228	dst_release(dst);
	229	}
	230
	231	if (!dev->xfrmdev_ops \|\| !dev->xfrmdev_ops->xdo_dev_state_add) {
67a63387	232	xso->dev = NULL;
d77e38e6 SK	233	dev_put(dev);
	234	return 0;
	235	}
	236
50bd870a YE	237	if (x->props.flags & XFRM_STATE_ESN &&
	238	!dev->xfrmdev_ops->xdo_dev_state_advance_esn) {
	239	xso->dev = NULL;
	240	dev_put(dev);
	241	return -EINVAL;
	242	}
	243
d77e38e6 SK	244	xso->dev = dev;
	245	xso->num_exthdrs = 1;
	246	xso->flags = xuo->flags;
	247
	248	err = dev->xfrmdev_ops->xdo_dev_state_add(x);
	249	if (err) {
4a132095 SN	250	xso->num_exthdrs = 0;
4a132095 SN	251	xso->flags = 0;
aa5dd6fa	252	xso->dev = NULL;
d77e38e6	253	dev_put(dev);
4a132095 SN	254
	255	if (err != -EOPNOTSUPP)
	256	return err;
d77e38e6 SK	257	}
	258
	259	return 0;
	260	}
	261	EXPORT_SYMBOL_GPL(xfrm_dev_state_add);
	262
	263	bool xfrm_dev_offload_ok(struct sk_buff skb, struct xfrm_state x)
	264	{
	265	int mtu;
	266	struct dst_entry *dst = skb_dst(skb);
	267	struct xfrm_dst xdst = (struct xfrm_dst )dst;
	268	struct net_device *dev = x->xso.dev;
	269
	270	if (!x->type_offload \|\| x->encap)
	271	return false;
	272
fcb662de	273	if ((!dev \|\| (dev == xfrm_dst_path(dst)->dev)) &&
c7b37c76 FW	274	(!xdst->child->xfrm)) {
c7b37c76 FW	275	mtu = xfrm_state_mtu(x, xdst->child_mtu_cached);
d77e38e6 SK	276	if (skb->len <= mtu)
	277	goto ok;
	278
779b7931	279	if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu))
d77e38e6 SK	280	goto ok;
	281	}
	282
	283	return false;
	284
	285	ok:
	286	if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_offload_ok)
	287	return x->xso.dev->xfrmdev_ops->xdo_dev_offload_ok(skb, x);
	288
	289	return true;
	290	}
	291	EXPORT_SYMBOL_GPL(xfrm_dev_offload_ok);
f53c7239 SK	292
	293	void xfrm_dev_resume(struct sk_buff *skb)
	294	{
	295	struct net_device *dev = skb->dev;
	296	int ret = NETDEV_TX_BUSY;
	297	struct netdev_queue *txq;
	298	struct softnet_data *sd;
	299	unsigned long flags;
	300
	301	rcu_read_lock();
4bd97d51	302	txq = netdev_core_pick_tx(dev, skb, NULL);
f53c7239 SK	303
	304	HARD_TX_LOCK(dev, txq, smp_processor_id());
	305	if (!netif_xmit_frozen_or_stopped(txq))
	306	skb = dev_hard_start_xmit(skb, dev, txq, &ret);
	307	HARD_TX_UNLOCK(dev, txq);
	308
	309	if (!dev_xmit_complete(ret)) {
	310	local_irq_save(flags);
	311	sd = this_cpu_ptr(&softnet_data);
	312	skb_queue_tail(&sd->xfrm_backlog, skb);
	313	raise_softirq_irqoff(NET_TX_SOFTIRQ);
	314	local_irq_restore(flags);
	315	}
	316	rcu_read_unlock();
	317	}
	318	EXPORT_SYMBOL_GPL(xfrm_dev_resume);
	319
	320	void xfrm_dev_backlog(struct softnet_data *sd)
	321	{
	322	struct sk_buff_head *xfrm_backlog = &sd->xfrm_backlog;
	323	struct sk_buff_head list;
	324	struct sk_buff *skb;
	325
	326	if (skb_queue_empty(xfrm_backlog))
	327	return;
	328
	329	__skb_queue_head_init(&list);
	330
	331	spin_lock(&xfrm_backlog->lock);
	332	skb_queue_splice_init(xfrm_backlog, &list);
	333	spin_unlock(&xfrm_backlog->lock);
	334
	335	while (!skb_queue_empty(&list)) {
	336	skb = __skb_dequeue(&list);
	337	xfrm_dev_resume(skb);
	338	}
	339
	340	}
b81f884a	341	#endif
d77e38e6	342
92a23206	343	static int xfrm_api_check(struct net_device *dev)
d77e38e6	344	{
92a23206	345	#ifdef CONFIG_XFRM_OFFLOAD
d77e38e6 SK	346	if ((dev->features & NETIF_F_HW_ESP_TX_CSUM) &&
	347	!(dev->features & NETIF_F_HW_ESP))
	348	return NOTIFY_BAD;
	349
92a23206 SN	350	if ((dev->features & NETIF_F_HW_ESP) &&
	351	(!(dev->xfrmdev_ops &&
	352	dev->xfrmdev_ops->xdo_dev_state_add &&
	353	dev->xfrmdev_ops->xdo_dev_state_delete)))
	354	return NOTIFY_BAD;
	355	#else
	356	if (dev->features & (NETIF_F_HW_ESP \| NETIF_F_HW_ESP_TX_CSUM))
	357	return NOTIFY_BAD;
	358	#endif
	359
d77e38e6 SK	360	return NOTIFY_DONE;
	361	}
	362
92a23206 SN	363	static int xfrm_dev_register(struct net_device *dev)
	364	{
	365	return xfrm_api_check(dev);
	366	}
	367
d77e38e6 SK	368	static int xfrm_dev_feat_change(struct net_device *dev)
d77e38e6 SK	369	{
92a23206	370	return xfrm_api_check(dev);
d77e38e6 SK	371	}
	372
	373	static int xfrm_dev_down(struct net_device *dev)
	374	{
2c1497bb	375	if (dev->features & NETIF_F_HW_ESP)
d77e38e6 SK	376	xfrm_dev_state_flush(dev_net(dev), dev, true);
d77e38e6 SK	377
d77e38e6 SK	378	return NOTIFY_DONE;
	379	}
	380
21f42cc9 SK	381	static int xfrm_dev_event(struct notifier_block this, unsigned long event, void ptr)
	382	{
	383	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
	384
	385	switch (event) {
d77e38e6 SK	386	case NETDEV_REGISTER:
	387	return xfrm_dev_register(dev);
	388
d77e38e6 SK	389	case NETDEV_FEAT_CHANGE:
	390	return xfrm_dev_feat_change(dev);
	391
21f42cc9	392	case NETDEV_DOWN:
d77e38e6	393	return xfrm_dev_down(dev);
21f42cc9 SK	394	}
	395	return NOTIFY_DONE;
	396	}
	397
	398	static struct notifier_block xfrm_dev_notifier = {
	399	.notifier_call = xfrm_dev_event,
	400	};
	401
e9a441b6	402	void __init xfrm_dev_init(void)
21f42cc9 SK	403	{
	404	register_netdevice_notifier(&xfrm_dev_notifier);
	405	}