netdev - Re: [PATCH xfrm-next v2 5/6] xfrm: add RX datapath protection for IPsec full offload mode

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Date:   Thu, 18 Aug 2022 16:36:46 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Steffen Klassert <steffen.klassert@...unet.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        netdev@...r.kernel.org, Raed Salem <raeds@...dia.com>,
        ipsec-devel <devel@...ux-ipsec.org>
Subject: Re: [PATCH xfrm-next v2 5/6] xfrm: add RX datapath protection for
 IPsec full offload mode

On Thu, Aug 18, 2022 at 12:27:08PM +0200, Steffen Klassert wrote:
> On Tue, Aug 16, 2022 at 11:59:26AM +0300, Leon Romanovsky wrote:
> > From: Leon Romanovsky <leonro@...dia.com>
> > 
> > Traffic received by device with enabled IPsec full offload should be
> > forwarded to the stack only after decryption, packet headers and
> > trailers removed.
> > 
> > Such packets are expected to be seen as normal (non-XFRM) ones, while
> > not-supported packets should be dropped by the HW.
> > 
> > Reviewed-by: Raed Salem <raeds@...dia.com>
> > Signed-off-by: Leon Romanovsky <leonro@...dia.com>
> 
> > @@ -1125,6 +1148,15 @@ static inline int __xfrm_policy_check2(struct sock *sk, int dir,
> >  {
> >  	struct net *net = dev_net(skb->dev);
> >  	int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
> > +	struct xfrm_offload *xo = xfrm_offload(skb);
> > +	struct xfrm_state *x;
> > +
> > +	if (xo) {
> > +		x = xfrm_input_state(skb);
> > +		if (x->xso.type == XFRM_DEV_OFFLOAD_FULL)
> > +			return (xo->flags & CRYPTO_DONE) &&
> > +			       (xo->status & CRYPTO_SUCCESS);
> > +	}
> >  
> >  	if (sk && sk->sk_policy[XFRM_POLICY_IN])
> >  		return __xfrm_policy_check(sk, ndir, skb, family);
> 
> What happens here if there is a socket policy configured?

No change, we don't support offload of socket policies.

Thanks