1 files changed, 50 insertions, 1 deletions

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index c9345fe3f8d2..138c1868be1d 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -257,6 +257,7 @@ extern int __xfrm_state_delete(struct xfrm_state *x);
 
 struct xfrm_state_afinfo {
         unsigned int            family;
+        unsigned int            proto;
         struct module           *owner;
         struct xfrm_type        *type_map[IPPROTO_MAX];
         struct xfrm_mode        *mode_map[XFRM_MODE_MAX];
@@ -267,6 +268,8 @@ 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_output)(struct xfrm_state *x,
+                                                  struct sk_buff *skb);
 };
 
 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
@@ -312,7 +315,18 @@ struct xfrm_mode {
          * header.  The value of the network header will always point
          * to the top IP header while skb->data will point to the payload.
          */
-        int (*output)(struct xfrm_state *x,struct sk_buff *skb);
+        int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
+
+        /*
+         * This is the actual output entry point.
+         *
+         * For transport mode and equivalent this would be identical to
+         * output2 (which does not need to be set).  While tunnel mode
+         * and equivalent would set this to a tunnel encapsulation function
+         * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
+         * call output2.
+         */
+        int (*output)(struct xfrm_state *x, struct sk_buff *skb);
 
         struct xfrm_state_afinfo *afinfo;
         struct module *owner;
@@ -454,6 +468,35 @@ struct xfrm_skb_cb {
 
 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
 
+/*
+ * This structure is used by the afinfo prepare_input/prepare_output functions
+ * to transmit header information to the mode input/output functions.
+ */
+struct xfrm_mode_skb_cb {
+        union {
+                struct inet_skb_parm h4;
+                struct inet6_skb_parm h6;
+        } header;
+
+        /* Copied from header for IPv4, always set to zero and DF for IPv6. */
+        __be16 id;
+        __be16 frag_off;
+
+        /* TOS for IPv4, class for IPv6. */
+        u8 tos;
+
+        /* TTL for IPv4, hop limitfor IPv6. */
+        u8 ttl;
+
+        /* Protocol for IPv4, NH for IPv6. */
+        u8 protocol;
+
+        /* Used by IPv6 only, zero for IPv4. */
+        u8 flow_lbl[3];
+};
+
+#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
+
 /* Audit Information */
 struct xfrm_audit
 {
@@ -1051,6 +1094,7 @@ 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_output(struct sk_buff *skb);
+extern int xfrm4_extract_header(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);
@@ -1060,9 +1104,12 @@ static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
         return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
 }
 
+extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
+extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
 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_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,
@@ -1072,6 +1119,8 @@ extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short
 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
+extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
+extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
 extern int xfrm6_output(struct sk_buff *skb);
 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
                                  u8 **prevhdr);