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net: Add a xfrm validate function to validate_xmit_skb

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When we do IPsec offloading, we need a fallback for
packets that were targeted to be IPsec offloaded but
rerouted to a device that does not support IPsec offload.
For that we add a function that checks the offloading
features of the sending device and and flags the
requirement of a fallback before it calls the IPsec
output function. The IPsec output function adds the IPsec
trailer and does encryption if needed.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Steffen Klassert 2017-04-14 10:07:28 +02:00
parent b3859c8ebf
commit f6e27114a6
3 changed files with 38 additions and 0 deletions
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6
include/net/xfrm.h
View file

@ -1862,6 +1862,7 @@ static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
#ifdef CONFIG_XFRM_OFFLOAD #ifdef CONFIG_XFRM_OFFLOAD
void __net_init xfrm_dev_init(void); void __net_init xfrm_dev_init(void);
int validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features);
int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
struct xfrm_user_offload *xuo); struct xfrm_user_offload *xuo);
bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x); bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
@ -1890,6 +1891,11 @@ static inline void __net_init xfrm_dev_init(void)
{ {
} }
static inline int validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features)
{
return 0;
}
static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo) static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
{ {
return 0; return 0;

3
net/core/dev.c
View file

@ -2972,6 +2972,9 @@ static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device
__skb_linearize(skb)) __skb_linearize(skb))
goto out_kfree_skb; goto out_kfree_skb;
if (validate_xmit_xfrm(skb, features))
goto out_kfree_skb;
/* If packet is not checksummed and device does not /* If packet is not checksummed and device does not
* support checksumming for this protocol, complete * support checksumming for this protocol, complete
* checksumming here. * checksumming here.

29
net/xfrm/xfrm_device.c
View file

@ -22,6 +22,35 @@
#include <net/xfrm.h> #include <net/xfrm.h>
#include <linux/notifier.h> #include <linux/notifier.h>
int validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features)
{
int err;
struct xfrm_state *x;
struct xfrm_offload *xo = xfrm_offload(skb);
if (skb_is_gso(skb))
return 0;
if (xo) {
x = skb->sp->xvec[skb->sp->len - 1];
if (xo->flags & XFRM_GRO || x->xso.flags & XFRM_OFFLOAD_INBOUND)
return 0;
x->outer_mode->xmit(x, skb);
err = x->type_offload->xmit(x, skb, features);
if (err) {
XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
return err;
}
skb_push(skb, skb->data - skb_mac_header(skb));
}
return 0;
}
EXPORT_SYMBOL_GPL(validate_xmit_xfrm);
int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
struct xfrm_user_offload *xuo) struct xfrm_user_offload *xuo)
{ {