Commit e7cd191f authored by wangfe's avatar wangfe Committed by Steffen Klassert
Browse files

xfrm: add SA information to the offloaded packet 



In packet offload mode, append Security Association (SA) information
to each packet, replicating the crypto offload implementation.
The XFRM_XMIT flag is set to enable packet to be returned immediately
from the validate_xmit_xfrm function, thus aligning with the existing
code path for packet offload mode.

This SA info helps HW offload match packets to their correct security
policies. The XFRM interface ID is included, which is crucial in setups
with multiple XFRM interfaces where source/destination addresses alone
can't pinpoint the right policy.

Signed-off-by: default avatarwangfe <wangfe@google.com>
Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
parent 5ce90c84

net/xfrm/xfrm_output.c

+21 −0
Original line number Diff line number Diff line
@@ -706,6 +706,8 @@ int xfrm_output(struct sock *sk, struct sk_buff *skb) 
	struct xfrm_state *x = skb_dst(skb)->xfrm;

	int family;

	int err;

	struct xfrm_offload *xo;

	struct sec_path *sp;



	family = (x->xso.type != XFRM_DEV_OFFLOAD_PACKET) ? x->outer_mode.family

		: skb_dst(skb)->ops->family;
@@ -728,6 +730,25 @@ int xfrm_output(struct sock *sk, struct sk_buff *skb) 
			kfree_skb(skb);

			return -EHOSTUNREACH;

		}

		sp = secpath_set(skb);

		if (!sp) {

			XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);

			kfree_skb(skb);

			return -ENOMEM;

		}



		sp->olen++;

		sp->xvec[sp->len++] = x;

		xfrm_state_hold(x);



		xo = xfrm_offload(skb);

		if (!xo) {

			secpath_reset(skb);

			XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);

			kfree_skb(skb);

			return -EINVAL;

		}

		xo->flags |= XFRM_XMIT;



		return xfrm_output_resume(sk, skb, 0);

	}