11 files changed, 141 insertions, 99 deletions

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 138c1868be1d..a9dbe091ae58 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -258,6 +258,7 @@ extern int __xfrm_state_delete(struct xfrm_state *x);
 struct xfrm_state_afinfo {
         unsigned int            family;
         unsigned int            proto;
+        unsigned int            eth_proto;
         struct module           *owner;
         struct xfrm_type        *type_map[IPPROTO_MAX];
         struct xfrm_mode        *mode_map[XFRM_MODE_MAX];
@@ -268,6 +269,8 @@ struct xfrm_state_afinfo {
         int                     (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
         int                     (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
         int                     (*output)(struct sk_buff *skb);
+        int                     (*extract_input)(struct xfrm_state *x,
+                                                 struct sk_buff *skb);
         int                     (*extract_output)(struct xfrm_state *x,
                                                   struct sk_buff *skb);
 };
@@ -302,6 +305,27 @@ extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
 
 struct xfrm_mode {
+        /*
+         * Remove encapsulation header.
+         *
+         * The IP header will be moved over the top of the encapsulation
+         * header.
+         *
+         * On entry, the transport header shall point to where the IP header
+         * should be and the network header shall be set to where the IP
+         * header currently is.  skb->data shall point to the start of the
+         * payload.
+         */
+        int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
+
+        /*
+         * This is the actual input entry point.
+         *
+         * For transport mode and equivalent this would be identical to
+         * input2 (which does not need to be set).  While tunnel mode
+         * and equivalent would set this to the tunnel encapsulation function
+         * xfrm4_prepare_input that would in turn call input2.
+         */
         int (*input)(struct xfrm_state *x, struct sk_buff *skb);
 
         /*
@@ -1093,8 +1117,10 @@ extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
 extern int xfrm_init_state(struct xfrm_state *x);
+extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
 extern int xfrm_output(struct sk_buff *skb);
 extern int xfrm4_extract_header(struct sk_buff *skb);
+extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
                            int encap_type);
 extern int xfrm4_rcv(struct sk_buff *skb);
@@ -1110,6 +1136,7 @@ extern int xfrm4_output(struct sk_buff *skb);
 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
 extern int xfrm6_extract_header(struct sk_buff *skb);
+extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
 extern int xfrm6_rcv(struct sk_buff *skb);
 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
diff --git a/net/ipv4/xfrm4_input.c b/net/ipv4/xfrm4_input.c
index 5e95c8a07efb..c0323d05ab69 100644
--- a/net/ipv4/xfrm4_input.c
+++ b/net/ipv4/xfrm4_input.c
@@ -16,6 +16,11 @@
 #include <net/ip.h>
 #include <net/xfrm.h>
 
+int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb)
+{
+        return xfrm4_extract_header(skb);
+}
+
 #ifdef CONFIG_NETFILTER
 static inline int xfrm4_rcv_encap_finish(struct sk_buff *skb)
 {
@@ -91,7 +96,7 @@ int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
 
                 xfrm_vec[xfrm_nr++] = x;
 
-                if (x->outer_mode->input(x, skb))
+                if (x->inner_mode->input(x, skb))
                         goto drop;
 
                 if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) {
diff --git a/net/ipv4/xfrm4_mode_beet.c b/net/ipv4/xfrm4_mode_beet.c
index 94842adce144..e093a7b59e18 100644
--- a/net/ipv4/xfrm4_mode_beet.c
+++ b/net/ipv4/xfrm4_mode_beet.c
@@ -17,6 +17,21 @@
 #include <net/ip.h>
 #include <net/xfrm.h>
 
+static void xfrm4_beet_make_header(struct sk_buff *skb)
+{
+        struct iphdr *iph = ip_hdr(skb);
+
+        iph->ihl = 5;
+        iph->version = 4;
+
+        iph->protocol = XFRM_MODE_SKB_CB(skb)->protocol;
+        iph->tos = XFRM_MODE_SKB_CB(skb)->tos;
+
+        iph->id = XFRM_MODE_SKB_CB(skb)->id;
+        iph->frag_off = XFRM_MODE_SKB_CB(skb)->frag_off;
+        iph->ttl = XFRM_MODE_SKB_CB(skb)->ttl;
+}
+
 /* Add encapsulation header.
  *
  * The top IP header will be constructed per draft-nikander-esp-beet-mode-06.txt.
@@ -40,20 +55,12 @@ static int xfrm4_beet_output(struct xfrm_state *x, struct sk_buff *skb)
                           offsetof(struct iphdr, protocol);
         skb->transport_header = skb->network_header + sizeof(*iph);
 
+        xfrm4_beet_make_header(skb);
+
         ph = (struct ip_beet_phdr *)__skb_pull(skb, sizeof(*iph) - hdrlen);
 
         top_iph = ip_hdr(skb);
 
-        top_iph->ihl = 5;
-        top_iph->version = 4;
-
-        top_iph->protocol = XFRM_MODE_SKB_CB(skb)->protocol;
-        top_iph->tos = XFRM_MODE_SKB_CB(skb)->tos;
-
-        top_iph->id = XFRM_MODE_SKB_CB(skb)->id;
-        top_iph->frag_off = XFRM_MODE_SKB_CB(skb)->frag_off;
-        top_iph->ttl = XFRM_MODE_SKB_CB(skb)->ttl;
-
         if (unlikely(optlen)) {
                 BUG_ON(optlen < 0);
 
@@ -75,43 +82,46 @@ static int xfrm4_beet_output(struct xfrm_state *x, struct sk_buff *skb)
 
 static int xfrm4_beet_input(struct xfrm_state *x, struct sk_buff *skb)
 {
-        struct iphdr *iph = ip_hdr(skb);
-        int phlen = 0;
+        struct iphdr *iph;
         int optlen = 0;
-        u8 ph_nexthdr = 0;
         int err = -EINVAL;
 
-        if (unlikely(iph->protocol == IPPROTO_BEETPH)) {
+        if (unlikely(XFRM_MODE_SKB_CB(skb)->protocol == IPPROTO_BEETPH)) {
                 struct ip_beet_phdr *ph;
+                int phlen;
 
                 if (!pskb_may_pull(skb, sizeof(*ph)))
                         goto out;
-                ph = (struct ip_beet_phdr *)(ipip_hdr(skb) + 1);
+
+                ph = (struct ip_beet_phdr *)skb->data;
 
                 phlen = sizeof(*ph) + ph->padlen;
                 optlen = ph->hdrlen * 8 + (IPV4_BEET_PHMAXLEN - phlen);
                 if (optlen < 0 || optlen & 3 || optlen > 250)
                         goto out;
 
-                if (!pskb_may_pull(skb, phlen + optlen))
-                        goto out;
-                skb->len -= phlen + optlen;
+                XFRM_MODE_SKB_CB(skb)->protocol = ph->nexthdr;
 
-                ph_nexthdr = ph->nexthdr;
+                if (!pskb_may_pull(skb, phlen));
+                        goto out;
+                __skb_pull(skb, phlen);
         }
 
-        skb_set_network_header(skb, phlen - sizeof(*iph));
-        memmove(skb_network_header(skb), iph, sizeof(*iph));
-        skb_set_transport_header(skb, phlen + optlen);
-        skb->data = skb_transport_header(skb);
+        skb_push(skb, sizeof(*iph));
+        skb_reset_network_header(skb);
+
+        memmove(skb->data - skb->mac_len, skb_mac_header(skb),
+                skb->mac_len);
+        skb_set_mac_header(skb, -skb->mac_len);
+
+        xfrm4_beet_make_header(skb);
 
         iph = ip_hdr(skb);
-        iph->ihl = (sizeof(*iph) + optlen) / 4;
-        iph->tot_len = htons(skb->len + iph->ihl * 4);
+
+        iph->ihl += optlen / 4;
+        iph->tot_len = htons(skb->len);
         iph->daddr = x->sel.daddr.a4;
         iph->saddr = x->sel.saddr.a4;
-        if (ph_nexthdr)
-                iph->protocol = ph_nexthdr;
         iph->check = 0;
         iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
         err = 0;
@@ -120,7 +130,8 @@ out:
 }
 
 static struct xfrm_mode xfrm4_beet_mode = {
-        .input = xfrm4_beet_input,
+        .input2 = xfrm4_beet_input,
+        .input = xfrm_prepare_input,
         .output2 = xfrm4_beet_output,
         .output = xfrm4_prepare_output,
         .owner = THIS_MODULE,
diff --git a/net/ipv4/xfrm4_mode_tunnel.c b/net/ipv4/xfrm4_mode_tunnel.c
index cc8bbb274e37..aa335dba8ffa 100644
--- a/net/ipv4/xfrm4_mode_tunnel.c
+++ b/net/ipv4/xfrm4_mode_tunnel.c
@@ -16,19 +16,12 @@
 
 static inline void ipip_ecn_decapsulate(struct sk_buff *skb)
 {
-        struct iphdr *outer_iph = ip_hdr(skb);
         struct iphdr *inner_iph = ipip_hdr(skb);
 
-        if (INET_ECN_is_ce(outer_iph->tos))
+        if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos))
                 IP_ECN_set_ce(inner_iph);
 }
 
-static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)
-{
-        if (INET_ECN_is_ce(iph->tos))
-                IP6_ECN_set_ce(ipv6_hdr(skb));
-}
-
 /* Add encapsulation header.
  *
  * The top IP header will be constructed per RFC 2401.
@@ -72,20 +65,11 @@ static int xfrm4_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
 
 static int xfrm4_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
 {
-        struct iphdr *iph = ip_hdr(skb);
         const unsigned char *old_mac;
         int err = -EINVAL;
 
-        switch (iph->protocol){
-                case IPPROTO_IPIP:
-                        break;
-#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
-                case IPPROTO_IPV6:
-                        break;
-#endif
-                default:
-                        goto out;
-        }
+        if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPIP)
+                goto out;
 
         if (!pskb_may_pull(skb, sizeof(struct iphdr)))
                 goto out;
@@ -94,20 +78,11 @@ static int xfrm4_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
             (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
                 goto out;
 
-        iph = ip_hdr(skb);
-        if (iph->protocol == IPPROTO_IPIP) {
-                if (x->props.flags & XFRM_STATE_DECAP_DSCP)
-                        ipv4_copy_dscp(ipv4_get_dsfield(iph), ipip_hdr(skb));
-                if (!(x->props.flags & XFRM_STATE_NOECN))
-                        ipip_ecn_decapsulate(skb);
-        }
-#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
-        else {
-                if (!(x->props.flags & XFRM_STATE_NOECN))
-                        ipip6_ecn_decapsulate(iph, skb);
-                skb->protocol = htons(ETH_P_IPV6);
-        }
-#endif
+        if (x->props.flags & XFRM_STATE_DECAP_DSCP)
+                ipv4_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipip_hdr(skb));
+        if (!(x->props.flags & XFRM_STATE_NOECN))
+                ipip_ecn_decapsulate(skb);
+
         old_mac = skb_mac_header(skb);
         skb_set_mac_header(skb, -skb->mac_len);
         memmove(skb_mac_header(skb), old_mac, skb->mac_len);
@@ -119,7 +94,8 @@ out:
 }
 
 static struct xfrm_mode xfrm4_tunnel_mode = {
-        .input = xfrm4_tunnel_input,
+        .input2 = xfrm4_tunnel_input,
+        .input = xfrm_prepare_input,
         .output2 = xfrm4_tunnel_output,
         .output = xfrm4_prepare_output,
         .owner = THIS_MODULE,
diff --git a/net/ipv4/xfrm4_state.c b/net/ipv4/xfrm4_state.c
index e6030e74ff65..85f04b7b237f 100644
--- a/net/ipv4/xfrm4_state.c
+++ b/net/ipv4/xfrm4_state.c
@@ -65,10 +65,12 @@ int xfrm4_extract_header(struct sk_buff *skb)
 static struct xfrm_state_afinfo xfrm4_state_afinfo = {
         .family                 = AF_INET,
         .proto                  = IPPROTO_IPIP,
+        .eth_proto              = htons(ETH_P_IP),
         .owner                  = THIS_MODULE,
         .init_flags             = xfrm4_init_flags,
         .init_tempsel           = __xfrm4_init_tempsel,
         .output                 = xfrm4_output,
+        .extract_input          = xfrm4_extract_input,
         .extract_output         = xfrm4_extract_output,
 };
 
diff --git a/net/ipv6/xfrm6_input.c b/net/ipv6/xfrm6_input.c
index 515783707e86..c458d0a2e684 100644
--- a/net/ipv6/xfrm6_input.c
+++ b/net/ipv6/xfrm6_input.c
@@ -16,6 +16,11 @@
 #include <net/ipv6.h>
 #include <net/xfrm.h>
 
+int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb)
+{
+        return xfrm6_extract_header(skb);
+}
+
 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
 {
         int err;
@@ -68,7 +73,7 @@ int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
 
                 xfrm_vec[xfrm_nr++] = x;
 
-                if (x->outer_mode->input(x, skb))
+                if (x->inner_mode->input(x, skb))
                         goto drop;
 
                 if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) {
diff --git a/net/ipv6/xfrm6_mode_beet.c b/net/ipv6/xfrm6_mode_beet.c
index 4988ed9c76c6..0527d11c1ae3 100644
--- a/net/ipv6/xfrm6_mode_beet.c
+++ b/net/ipv6/xfrm6_mode_beet.c
@@ -19,6 +19,20 @@
 #include <net/ipv6.h>
 #include <net/xfrm.h>
 
+static void xfrm6_beet_make_header(struct sk_buff *skb)
+{
+        struct ipv6hdr *iph = ipv6_hdr(skb);
+
+        iph->version = 6;
+
+        memcpy(iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl,
+               sizeof(iph->flow_lbl));
+        iph->nexthdr = XFRM_MODE_SKB_CB(skb)->protocol;
+
+        ipv6_change_dsfield(iph, 0, XFRM_MODE_SKB_CB(skb)->tos);
+        iph->hop_limit = XFRM_MODE_SKB_CB(skb)->ttl;
+}
+
 /* Add encapsulation header.
  *
  * The top IP header will be constructed per draft-nikander-esp-beet-mode-06.txt.
@@ -31,16 +45,11 @@ static int xfrm6_beet_output(struct xfrm_state *x, struct sk_buff *skb)
         skb->mac_header = skb->network_header +
                           offsetof(struct ipv6hdr, nexthdr);
         skb->transport_header = skb->network_header + sizeof(*top_iph);
-        top_iph = ipv6_hdr(skb);
 
-        top_iph->version = 6;
+        xfrm6_beet_make_header(skb);
 
-        memcpy(top_iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl,
-               sizeof(top_iph->flow_lbl));
-        top_iph->nexthdr = XFRM_MODE_SKB_CB(skb)->protocol;
+        top_iph = ipv6_hdr(skb);
 
-        ipv6_change_dsfield(top_iph, 0, XFRM_MODE_SKB_CB(skb)->tos);
-        top_iph->hop_limit = XFRM_MODE_SKB_CB(skb)->ttl;
         ipv6_addr_copy(&top_iph->saddr, (struct in6_addr *)&x->props.saddr);
         ipv6_addr_copy(&top_iph->daddr, (struct in6_addr *)&x->id.daddr);
         return 0;
@@ -51,19 +60,21 @@ static int xfrm6_beet_input(struct xfrm_state *x, struct sk_buff *skb)
         struct ipv6hdr *ip6h;
         const unsigned char *old_mac;
         int size = sizeof(struct ipv6hdr);
-        int err = -EINVAL;
+        int err;
 
-        if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
+        err = skb_cow_head(skb, size + skb->mac_len);
+        if (err)
                 goto out;
 
-        skb_push(skb, size);
-        memmove(skb->data, skb_network_header(skb), size);
+        __skb_push(skb, size);
         skb_reset_network_header(skb);
 
         old_mac = skb_mac_header(skb);
         skb_set_mac_header(skb, -skb->mac_len);
         memmove(skb_mac_header(skb), old_mac, skb->mac_len);
 
+        xfrm6_beet_make_header(skb);
+
         ip6h = ipv6_hdr(skb);
         ip6h->payload_len = htons(skb->len - size);
         ipv6_addr_copy(&ip6h->daddr, (struct in6_addr *) &x->sel.daddr.a6);
@@ -74,7 +85,8 @@ out:
 }
 
 static struct xfrm_mode xfrm6_beet_mode = {
-        .input = xfrm6_beet_input,
+        .input2 = xfrm6_beet_input,
+        .input = xfrm_prepare_input,
         .output2 = xfrm6_beet_output,
         .output = xfrm6_prepare_output,
         .owner = THIS_MODULE,
diff --git a/net/ipv6/xfrm6_mode_tunnel.c b/net/ipv6/xfrm6_mode_tunnel.c
index d45ce5d44197..f7d0d6612650 100644
--- a/net/ipv6/xfrm6_mode_tunnel.c
+++ b/net/ipv6/xfrm6_mode_tunnel.c
@@ -25,12 +25,6 @@ static inline void ipip6_ecn_decapsulate(struct sk_buff *skb)
                 IP6_ECN_set_ce(inner_iph);
 }
 
-static inline void ip6ip_ecn_decapsulate(struct sk_buff *skb)
-{
-        if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6_hdr(skb))))
-                        IP_ECN_set_ce(ipip_hdr(skb));
-}
-
 /* Add encapsulation header.
  *
  * The top IP header will be constructed per RFC 2401.
@@ -68,10 +62,8 @@ static int xfrm6_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
 {
         int err = -EINVAL;
         const unsigned char *old_mac;
-        const unsigned char *nh = skb_network_header(skb);
 
-        if (nh[IP6CB(skb)->nhoff] != IPPROTO_IPV6 &&
-            nh[IP6CB(skb)->nhoff] != IPPROTO_IPIP)
+        if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPV6)
                 goto out;
         if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
                 goto out;
@@ -80,18 +72,12 @@ static int xfrm6_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
             (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
                 goto out;
 
-        nh = skb_network_header(skb);
-        if (nh[IP6CB(skb)->nhoff] == IPPROTO_IPV6) {
-                if (x->props.flags & XFRM_STATE_DECAP_DSCP)
-                        ipv6_copy_dscp(ipv6_get_dsfield(ipv6_hdr(skb)),
-                                       ipipv6_hdr(skb));
-                if (!(x->props.flags & XFRM_STATE_NOECN))
-                        ipip6_ecn_decapsulate(skb);
-        } else {
-                if (!(x->props.flags & XFRM_STATE_NOECN))
-                        ip6ip_ecn_decapsulate(skb);
-                skb->protocol = htons(ETH_P_IP);
-        }
+        if (x->props.flags & XFRM_STATE_DECAP_DSCP)
+                ipv6_copy_dscp(ipv6_get_dsfield(ipv6_hdr(skb)),
+                               ipipv6_hdr(skb));
+        if (!(x->props.flags & XFRM_STATE_NOECN))
+                ipip6_ecn_decapsulate(skb);
+
         old_mac = skb_mac_header(skb);
         skb_set_mac_header(skb, -skb->mac_len);
         memmove(skb_mac_header(skb), old_mac, skb->mac_len);
@@ -103,7 +89,8 @@ out:
 }
 
 static struct xfrm_mode xfrm6_tunnel_mode = {
-        .input = xfrm6_tunnel_input,
+        .input2 = xfrm6_tunnel_input,
+        .input = xfrm_prepare_input,
         .output2 = xfrm6_tunnel_output,
         .output = xfrm6_prepare_output,
         .owner = THIS_MODULE,
diff --git a/net/ipv6/xfrm6_output.c b/net/ipv6/xfrm6_output.c
index bc2e80e3b0b1..c45050cfe72b 100644
--- a/net/ipv6/xfrm6_output.c
+++ b/net/ipv6/xfrm6_output.c
@@ -53,6 +53,7 @@ int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb)
         if (err)
                 return err;
 
+        IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);
         return xfrm6_extract_header(skb);
 }
 
diff --git a/net/ipv6/xfrm6_state.c b/net/ipv6/xfrm6_state.c
index 98b05f472322..90fef0a4726f 100644
--- a/net/ipv6/xfrm6_state.c
+++ b/net/ipv6/xfrm6_state.c
@@ -177,7 +177,8 @@ int xfrm6_extract_header(struct sk_buff *skb)
         XFRM_MODE_SKB_CB(skb)->frag_off = htons(IP_DF);
         XFRM_MODE_SKB_CB(skb)->tos = ipv6_get_dsfield(iph);
         XFRM_MODE_SKB_CB(skb)->ttl = iph->hop_limit;
-        XFRM_MODE_SKB_CB(skb)->protocol = iph->nexthdr;
+        XFRM_MODE_SKB_CB(skb)->protocol =
+                skb_network_header(skb)[IP6CB(skb)->nhoff];
         memcpy(XFRM_MODE_SKB_CB(skb)->flow_lbl, iph->flow_lbl,
                sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
 
@@ -187,11 +188,13 @@ int xfrm6_extract_header(struct sk_buff *skb)
 static struct xfrm_state_afinfo xfrm6_state_afinfo = {
         .family                 = AF_INET6,
         .proto                  = IPPROTO_IPV6,
+        .eth_proto              = htons(ETH_P_IPV6),
         .owner                  = THIS_MODULE,
         .init_tempsel           = __xfrm6_init_tempsel,
         .tmpl_sort              = __xfrm6_tmpl_sort,
         .state_sort             = __xfrm6_state_sort,
         .output                 = xfrm6_output,
+        .extract_input          = xfrm6_extract_input,
         .extract_output         = xfrm6_extract_output,
 };
 
diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index cb97fda1b6df..4c803f7e74e5 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -81,6 +81,19 @@ int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
 }
 EXPORT_SYMBOL(xfrm_parse_spi);
 
+int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
+{
+        int err;
+
+        err = x->outer_mode->afinfo->extract_input(x, skb);
+        if (err)
+                return err;
+
+        skb->protocol = x->inner_mode->afinfo->eth_proto;
+        return x->inner_mode->input2(x, skb);
+}
+EXPORT_SYMBOL(xfrm_prepare_input);
+
 void __init xfrm_input_init(void)
 {
         secpath_cachep = kmem_cache_create("secpath_cache",