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Message-ID: <1491978413-5700-5-git-send-email-steffen.klassert@secunet.com>
Date: Wed, 12 Apr 2017 08:26:43 +0200
From: Steffen Klassert <steffen.klassert@...unet.com>
To: <netdev@...r.kernel.org>
CC: Steffen Klassert <steffen.klassert@...unet.com>,
Ilan Tayari <ilant@...lanox.com>
Subject: [PATCH RFC ipsec-next 04/14] 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: Steffen Klassert <steffen.klassert@...unet.com>
---
include/net/xfrm.h | 10 ++++++++++
net/ipv4/xfrm4_mode_transport.c | 32 ++++++++++++++++++++++++++++++++
net/ipv4/xfrm4_mode_tunnel.c | 25 +++++++++++++++++++++++++
net/ipv6/xfrm6_mode_transport.c | 33 +++++++++++++++++++++++++++++++++
net/ipv6/xfrm6_mode_tunnel.c | 24 ++++++++++++++++++++++++
5 files changed, 124 insertions(+)
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index ac984da..54515d9 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -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;
diff --git a/net/ipv4/xfrm4_mode_transport.c b/net/ipv4/xfrm4_mode_transport.c
index 4acc050..6c2411d 100644
--- a/net/ipv4/xfrm4_mode_transport.c
+++ b/net/ipv4/xfrm4_mode_transport.c
@@ -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,
};
diff --git a/net/ipv4/xfrm4_mode_tunnel.c b/net/ipv4/xfrm4_mode_tunnel.c
index 35feda6..d3f2434 100644
--- a/net/ipv4/xfrm4_mode_tunnel.c
+++ b/net/ipv4/xfrm4_mode_tunnel.c
@@ -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,
diff --git a/net/ipv6/xfrm6_mode_transport.c b/net/ipv6/xfrm6_mode_transport.c
index 4439ee4..eb9b36b 100644
--- a/net/ipv6/xfrm6_mode_transport.c
+++ b/net/ipv6/xfrm6_mode_transport.c
@@ -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,
};
diff --git a/net/ipv6/xfrm6_mode_tunnel.c b/net/ipv6/xfrm6_mode_tunnel.c
index 372855e..19a60fc 100644
--- a/net/ipv6/xfrm6_mode_tunnel.c
+++ b/net/ipv6/xfrm6_mode_tunnel.c
@@ -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,
--
2.7.4
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