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authorSteffen Klassert <steffen.klassert@secunet.com>2017-04-14 10:06:01 +0200
committerSteffen Klassert <steffen.klassert@secunet.com>2017-04-14 10:06:01 +0200
commitc35fe4106b928d0a5909cfdac53c1db559b24299 (patch)
treeeeaebe39a98ae156227b92412c2cb46c0de88900 /net/ipv4/xfrm4_mode_transport.c
parentxfrm: Move device notifications to a sepatate file (diff)
downloadlinux-dev-c35fe4106b928d0a5909cfdac53c1db559b24299.tar.xz
linux-dev-c35fe4106b928d0a5909cfdac53c1db559b24299.zip
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@secunet.com>
Diffstat (limited to 'net/ipv4/xfrm4_mode_transport.c')
-rw-r--r--net/ipv4/xfrm4_mode_transport.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/net/ipv4/xfrm4_mode_transport.c b/net/ipv4/xfrm4_mode_transport.c
index 4acc0508c5eb..6c2411d09386 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,
};