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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next 

Steffen Klassert says:

====================
pull request (net-next): ipsec-next 2018-01-26

One last patch for this development cycle:

1) Add ESN support for IPSec HW offload.
   From Yossef Efraim.

Please pull or let me know if there are problems.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2018-01-26 10:22:53 -05:00
parent 5b09179e7f 50bd870a9e
commit a81e4affe1
5 changed files with 27 additions and 2 deletions
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3
Documentation/networking/xfrm_device.txt
View File

@ -41,6 +41,7 @@ struct xfrmdev_ops {
void (*xdo_dev_state_free) (struct xfrm_state *x); void (*xdo_dev_state_free) (struct xfrm_state *x);
bool (*xdo_dev_offload_ok) (struct sk_buff *skb, bool (*xdo_dev_offload_ok) (struct sk_buff *skb,
struct xfrm_state *x); struct xfrm_state *x);
void (*xdo_dev_state_advance_esn) (struct xfrm_state *x);
}; };
The NIC driver offering ipsec offload will need to implement these The NIC driver offering ipsec offload will need to implement these
@ -117,6 +118,8 @@ the stack in xfrm_input().
hand the packet to napi_gro_receive() as usual hand the packet to napi_gro_receive() as usual
In ESN mode, xdo_dev_state_advance_esn() is called from xfrm_replay_advance_esn().
Driver will check packet seq number and update HW ESN state machine if needed.
When the SA is removed by the user, the driver's xdo_dev_state_delete() When the SA is removed by the user, the driver's xdo_dev_state_delete()
is asked to disable the offload. Later, xdo_dev_state_free() is called is asked to disable the offload. Later, xdo_dev_state_free() is called

1
include/linux/netdevice.h
View File

@ -851,6 +851,7 @@ struct xfrmdev_ops {
void (*xdo_dev_state_free) (struct xfrm_state *x); void (*xdo_dev_state_free) (struct xfrm_state *x);
bool (*xdo_dev_offload_ok) (struct sk_buff *skb, bool (*xdo_dev_offload_ok) (struct sk_buff *skb,
struct xfrm_state *x); struct xfrm_state *x);
void (*xdo_dev_state_advance_esn) (struct xfrm_state *x);
}; };
#endif #endif

12
include/net/xfrm.h
View File

@ -1904,6 +1904,14 @@ 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);
static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
{
struct xfrm_state_offload *xso = &x->xso;
if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
}
static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
{ {
struct xfrm_state *x = dst->xfrm; struct xfrm_state *x = dst->xfrm;
@ -1974,6 +1982,10 @@ static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x
return false; return false;
} }
static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
{
}
static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
{ {
return false; return false;

11
net/xfrm/xfrm_device.c
View File

@ -147,8 +147,8 @@ int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
if (!x->type_offload) if (!x->type_offload)
return -EINVAL; return -EINVAL;
/* We don't yet support UDP encapsulation, TFC padding and ESN. */ /* We don't yet support UDP encapsulation and TFC padding. */
if (x->encap || x->tfcpad || (x->props.flags & XFRM_STATE_ESN)) if (x->encap || x->tfcpad)
return -EINVAL; return -EINVAL;
dev = dev_get_by_index(net, xuo->ifindex); dev = dev_get_by_index(net, xuo->ifindex);
@ -178,6 +178,13 @@ int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
return 0; 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->dev = dev;
xso->num_exthdrs = 1; xso->num_exthdrs = 1;
xso->flags = xuo->flags; xso->flags = xuo->flags;

2
net/xfrm/xfrm_replay.c
View File

@ -551,6 +551,8 @@ static void xfrm_replay_advance_esn(struct xfrm_state *x, __be32 net_seq)
bitnr = replay_esn->replay_window - (diff - pos); bitnr = replay_esn->replay_window - (diff - pos);
} }
xfrm_dev_state_advance_esn(x);
nr = bitnr >> 5; nr = bitnr >> 5;
bitnr = bitnr & 0x1F; bitnr = bitnr & 0x1F;
replay_esn->bmp[nr] |= (1U << bitnr); replay_esn->bmp[nr] |= (1U << bitnr);