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Commit c35fe410 authored by Steffen Klassert's avatar Steffen Klassert
Browse files

xfrm: Add mode handlers for IPsec on layer 2 



This patch adds a gso_segment and xmit callback for the
xfrm_mode and implement these functions for tunnel and
transport mode.

Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
parent 21f42cc9

include/net/xfrm.h

+10 −0
Original line number Diff line number Diff line
@@ -444,6 +444,16 @@ struct xfrm_mode { 
	 */

	int (*output)(struct xfrm_state *x, struct sk_buff *skb);



	/*

	 * Adjust pointers into the packet and do GSO segmentation.

	 */

	struct sk_buff *(*gso_segment)(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features);



	/*

	 * Adjust pointers into the packet when IPsec is done at layer2.

	 */

	void (*xmit)(struct xfrm_state *x, struct sk_buff *skb);



	struct xfrm_state_afinfo *afinfo;

	struct module *owner;

	unsigned int encap;

net/ipv4/xfrm4_mode_transport.c

+32 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 
#include <net/dst.h>

#include <net/ip.h>

#include <net/xfrm.h>

#include <net/protocol.h>



/* Add encapsulation header.

 *
@@ -56,9 +57,40 @@ static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb) 
	return 0;

}



static struct sk_buff *xfrm4_transport_gso_segment(struct xfrm_state *x,

						   struct sk_buff *skb,

						   netdev_features_t features)

{

	const struct net_offload *ops;

	struct sk_buff *segs = ERR_PTR(-EINVAL);

	struct xfrm_offload *xo = xfrm_offload(skb);



	skb->transport_header += x->props.header_len;

	ops = rcu_dereference(inet_offloads[xo->proto]);

	if (likely(ops && ops->callbacks.gso_segment))

		segs = ops->callbacks.gso_segment(skb, features);



	return segs;

}



static void xfrm4_transport_xmit(struct xfrm_state *x, struct sk_buff *skb)

{

	struct xfrm_offload *xo = xfrm_offload(skb);



	skb_reset_mac_len(skb);

	pskb_pull(skb, skb->mac_len + sizeof(struct iphdr) + x->props.header_len);



	if (xo->flags & XFRM_GSO_SEGMENT) {

		 skb_reset_transport_header(skb);

		 skb->transport_header -= x->props.header_len;

	}

}



static struct xfrm_mode xfrm4_transport_mode = {

	.input = xfrm4_transport_input,

	.output = xfrm4_transport_output,

	.gso_segment = xfrm4_transport_gso_segment,

	.xmit = xfrm4_transport_xmit,

	.owner = THIS_MODULE,

	.encap = XFRM_MODE_TRANSPORT,

};

net/ipv4/xfrm4_mode_tunnel.c

+25 −0
Original line number Diff line number Diff line
@@ -96,11 +96,36 @@ static int xfrm4_mode_tunnel_input(struct xfrm_state *x, struct sk_buff *skb) 
	return err;

}



static struct sk_buff *xfrm4_mode_tunnel_gso_segment(struct xfrm_state *x,

						     struct sk_buff *skb,

						     netdev_features_t features)

{

	__skb_push(skb, skb->mac_len);

	return skb_mac_gso_segment(skb, features);



}



static void xfrm4_mode_tunnel_xmit(struct xfrm_state *x, struct sk_buff *skb)

{

	struct xfrm_offload *xo = xfrm_offload(skb);



	if (xo->flags & XFRM_GSO_SEGMENT) {

		skb->network_header = skb->network_header - x->props.header_len;

		skb->transport_header = skb->network_header +

					sizeof(struct iphdr);

	}



	skb_reset_mac_len(skb);

	pskb_pull(skb, skb->mac_len + x->props.header_len);

}



static struct xfrm_mode xfrm4_tunnel_mode = {

	.input2 = xfrm4_mode_tunnel_input,

	.input = xfrm_prepare_input,

	.output2 = xfrm4_mode_tunnel_output,

	.output = xfrm4_prepare_output,

	.gso_segment = xfrm4_mode_tunnel_gso_segment,

	.xmit = xfrm4_mode_tunnel_xmit,

	.owner = THIS_MODULE,

	.encap = XFRM_MODE_TUNNEL,

	.flags = XFRM_MODE_FLAG_TUNNEL,

net/ipv6/xfrm6_mode_transport.c

+33 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 
#include <net/dst.h>

#include <net/ipv6.h>

#include <net/xfrm.h>

#include <net/protocol.h>



/* Add encapsulation header.

 *
@@ -61,9 +62,41 @@ static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb) 
	return 0;

}



static struct sk_buff *xfrm4_transport_gso_segment(struct xfrm_state *x,

						   struct sk_buff *skb,

						   netdev_features_t features)

{

	const struct net_offload *ops;

	struct sk_buff *segs = ERR_PTR(-EINVAL);

	struct xfrm_offload *xo = xfrm_offload(skb);



	skb->transport_header += x->props.header_len;

	ops = rcu_dereference(inet6_offloads[xo->proto]);

	if (likely(ops && ops->callbacks.gso_segment))

		segs = ops->callbacks.gso_segment(skb, features);



	return segs;

}



static void xfrm6_transport_xmit(struct xfrm_state *x, struct sk_buff *skb)

{

	struct xfrm_offload *xo = xfrm_offload(skb);



	skb_reset_mac_len(skb);

	pskb_pull(skb, skb->mac_len + sizeof(struct ipv6hdr) + x->props.header_len);



	if (xo->flags & XFRM_GSO_SEGMENT) {

		 skb_reset_transport_header(skb);

		 skb->transport_header -= x->props.header_len;

	}

}





static struct xfrm_mode xfrm6_transport_mode = {

	.input = xfrm6_transport_input,

	.output = xfrm6_transport_output,

	.gso_segment = xfrm4_transport_gso_segment,

	.xmit = xfrm6_transport_xmit,

	.owner = THIS_MODULE,

	.encap = XFRM_MODE_TRANSPORT,

};

net/ipv6/xfrm6_mode_tunnel.c

+24 −0
Original line number Diff line number Diff line
@@ -96,11 +96,35 @@ static int xfrm6_mode_tunnel_input(struct xfrm_state *x, struct sk_buff *skb) 
	return err;

}



static struct sk_buff *xfrm6_mode_tunnel_gso_segment(struct xfrm_state *x,

						     struct sk_buff *skb,

						     netdev_features_t features)

{

	__skb_push(skb, skb->mac_len);

	return skb_mac_gso_segment(skb, features);



}



static void xfrm6_mode_tunnel_xmit(struct xfrm_state *x, struct sk_buff *skb)

{

	struct xfrm_offload *xo = xfrm_offload(skb);



	if (xo->flags & XFRM_GSO_SEGMENT) {

		skb->network_header = skb->network_header - x->props.header_len;

		skb->transport_header = skb->network_header + sizeof(struct ipv6hdr);

	}



	skb_reset_mac_len(skb);

	pskb_pull(skb, skb->mac_len + x->props.header_len);

}



static struct xfrm_mode xfrm6_tunnel_mode = {

	.input2 = xfrm6_mode_tunnel_input,

	.input = xfrm_prepare_input,

	.output2 = xfrm6_mode_tunnel_output,

	.output = xfrm6_prepare_output,

	.gso_segment = xfrm6_mode_tunnel_gso_segment,

	.xmit = xfrm6_mode_tunnel_xmit,

	.owner = THIS_MODULE,

	.encap = XFRM_MODE_TUNNEL,

	.flags = XFRM_MODE_FLAG_TUNNEL,