[PATCH AUTOSEL 4.18 003/100] xfrm: reset transport header back to network header after all input transforms ahave been applied

[Sasha Levin]

From: Sowmini Varadhan <sowmini.varad...@oracle.com>

[ Upstream commit bfc0698bebcb16d19ecfc89574ad4d696955e5d3 ]

A policy may have been set up with multiple transforms (e.g., ESP
and ipcomp). In this situation, the ingress IPsec processing
iterates in xfrm_input() and applies each transform in turn,
processing the nexthdr to find any additional xfrm that may apply.

This patch resets the transport header back to network header
only after the last transformation so that subsequent xfrms
can find the correct transport header.

Fixes: 7785bba299a8 ("esp: Add a software GRO codepath")
Suggested-by: Steffen Klassert <steffen.klass...@secunet.com>
Signed-off-by: Sowmini Varadhan <sowmini.varad...@oracle.com>
Signed-off-by: Steffen Klassert <steffen.klass...@secunet.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 net/ipv4/xfrm4_input.c          | 1 +
 net/ipv4/xfrm4_mode_transport.c | 4 +---
 net/ipv6/xfrm6_input.c          | 1 +
 net/ipv6/xfrm6_mode_transport.c | 4 +---
 4 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/net/ipv4/xfrm4_input.c b/net/ipv4/xfrm4_input.c
index bcfc00e88756..f8de2482a529 100644
--- a/net/ipv4/xfrm4_input.c
+++ b/net/ipv4/xfrm4_input.c
@@ -67,6 +67,7 @@ int xfrm4_transport_finish(struct sk_buff *skb, int async)
 
        if (xo && (xo->flags & XFRM_GRO)) {
                skb_mac_header_rebuild(skb);
+               skb_reset_transport_header(skb);
                return 0;
        }
 
diff --git a/net/ipv4/xfrm4_mode_transport.c b/net/ipv4/xfrm4_mode_transport.c
index 3d36644890bb..1ad2c2c4e250 100644
--- a/net/ipv4/xfrm4_mode_transport.c
+++ b/net/ipv4/xfrm4_mode_transport.c
@@ -46,7 +46,6 @@ static int xfrm4_transport_output(struct xfrm_state *x, 
struct sk_buff *skb)
 static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb)
 {
        int ihl = skb->data - skb_transport_header(skb);
-       struct xfrm_offload *xo = xfrm_offload(skb);
 
        if (skb->transport_header != skb->network_header) {
                memmove(skb_transport_header(skb),
@@ -54,8 +53,7 @@ static int xfrm4_transport_input(struct xfrm_state *x, struct 
sk_buff *skb)
                skb->network_header = skb->transport_header;
        }
        ip_hdr(skb)->tot_len = htons(skb->len + ihl);
-       if (!xo || !(xo->flags & XFRM_GRO))
-               skb_reset_transport_header(skb);
+       skb_reset_transport_header(skb);
        return 0;
 }
 
diff --git a/net/ipv6/xfrm6_input.c b/net/ipv6/xfrm6_input.c
index 841f4a07438e..9ef490dddcea 100644
--- a/net/ipv6/xfrm6_input.c
+++ b/net/ipv6/xfrm6_input.c
@@ -59,6 +59,7 @@ int xfrm6_transport_finish(struct sk_buff *skb, int async)
 
        if (xo && (xo->flags & XFRM_GRO)) {
                skb_mac_header_rebuild(skb);
+               skb_reset_transport_header(skb);
                return -1;
        }
 
diff --git a/net/ipv6/xfrm6_mode_transport.c b/net/ipv6/xfrm6_mode_transport.c
index 9ad07a91708e..3c29da5defe6 100644
--- a/net/ipv6/xfrm6_mode_transport.c
+++ b/net/ipv6/xfrm6_mode_transport.c
@@ -51,7 +51,6 @@ static int xfrm6_transport_output(struct xfrm_state *x, 
struct sk_buff *skb)
 static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb)
 {
        int ihl = skb->data - skb_transport_header(skb);
-       struct xfrm_offload *xo = xfrm_offload(skb);
 
        if (skb->transport_header != skb->network_header) {
                memmove(skb_transport_header(skb),
@@ -60,8 +59,7 @@ static int xfrm6_transport_input(struct xfrm_state *x, struct 
sk_buff *skb)
        }
        ipv6_hdr(skb)->payload_len = htons(skb->len + ihl -
                                           sizeof(struct ipv6hdr));
-       if (!xo || !(xo->flags & XFRM_GRO))
-               skb_reset_transport_header(skb);
+       skb_reset_transport_header(skb);
        return 0;
 }
 
-- 
2.17.1