357 lines
7.6 KiB
C
357 lines
7.6 KiB
C
/*
|
|
* xfrm_device.c - IPsec device offloading code.
|
|
*
|
|
* Copyright (c) 2015 secunet Security Networks AG
|
|
*
|
|
* Author:
|
|
* Steffen Klassert <steffen.klassert@secunet.com>
|
|
*
|
|
* 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);
|
|
|
|
if (!xo)
|
|
return skb;
|
|
|
|
if (!(features & NETIF_F_HW_ESP))
|
|
esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK);
|
|
|
|
x = skb->sp->xvec[skb->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.offload_handle || (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;
|
|
skb2->next = NULL;
|
|
|
|
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, x->props.output_mark);
|
|
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->dev = NULL;
|
|
dev_put(dev);
|
|
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 || (x->xso.offload_handle && (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_mtu(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_unregister(struct net_device *dev)
|
|
{
|
|
xfrm_policy_cache_flush();
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
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);
|
|
|
|
xfrm_policy_cache_flush();
|
|
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_UNREGISTER:
|
|
return xfrm_dev_unregister(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 __net_init xfrm_dev_init(void)
|
|
{
|
|
register_netdevice_notifier(&xfrm_dev_notifier);
|
|
}
|