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Commit 50bd870a authored by Yossef Efraim's avatar Yossef Efraim Committed by Steffen Klassert
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xfrm: Add ESN support for IPSec HW offload 



This patch adds ESN support to IPsec device offload.
Adding new xfrm device operation to synchronize device ESN.

Signed-off-by: default avatarYossef Efraim <yossefe@mellanox.com>
Signed-off-by: default avatarShannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
parent 4f7d5851

Documentation/networking/xfrm_device.txt

+3 −0
Original line number Diff line number Diff line
@@ -41,6 +41,7 @@ struct xfrmdev_ops { 
	void	(*xdo_dev_state_free) (struct xfrm_state *x);

	bool	(*xdo_dev_offload_ok) (struct sk_buff *skb,

				       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
@@ -117,6 +118,8 @@ the stack in xfrm_input(). 


	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()

is asked to disable the offload.  Later, xdo_dev_state_free() is called

include/linux/netdevice.h

+1 −0
Original line number Diff line number Diff line
@@ -851,6 +851,7 @@ struct xfrmdev_ops { 
	void	(*xdo_dev_state_free) (struct xfrm_state *x);

	bool	(*xdo_dev_offload_ok) (struct sk_buff *skb,

				       struct xfrm_state *x);

	void	(*xdo_dev_state_advance_esn) (struct xfrm_state *x);

};

#endif

include/net/xfrm.h

+12 −0
Original line number Diff line number Diff line
@@ -1904,6 +1904,14 @@ int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, 
		       struct xfrm_user_offload *xuo);

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)

{

	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;

}



static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)

{

}



static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)

{

	return false;

net/xfrm/xfrm_device.c

+9 −2
Original line number Diff line number Diff line
@@ -147,8 +147,8 @@ int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, 
	if (!x->type_offload)

		return -EINVAL;



	/* We don't yet support UDP encapsulation, TFC padding and ESN. */

	if (x->encap || x->tfcpad || (x->props.flags & XFRM_STATE_ESN))

	/* 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);
@@ -178,6 +178,13 @@ int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, 
		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;

net/xfrm/xfrm_replay.c

+2 −0
Original line number Diff line number Diff line
@@ -551,6 +551,8 @@ static void xfrm_replay_advance_esn(struct xfrm_state *x, __be32 net_seq) 
			bitnr = replay_esn->replay_window - (diff - pos);

	}



	xfrm_dev_state_advance_esn(x);



	nr = bitnr >> 5;

	bitnr = bitnr & 0x1F;

	replay_esn->bmp[nr] |= (1U << bitnr);