[IPSEC]: Get rid of ipv6_{auth,esp,comp}_hdr

This patch removes the duplicate ipv6_{auth,esp,comp}_hdr structures since
they're identical to the IPv4 versions.  Duplicating them would only create
problems for ourselves later when we need to add things like extended
sequence numbers.

I've also added transport header type conversion headers for these types
which are now used by the transforms.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 24 insertions, 22 deletions

diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 4ca60c3320f..5d35a4cc3bf 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -96,27 +96,6 @@ struct ipv6_destopt_hao {
 	struct in6_addr		addr;
 } __attribute__ ((__packed__));
 
-struct ipv6_auth_hdr {
-	__u8  nexthdr;
-	__u8  hdrlen;           /* This one is measured in 32 bit units! */
-	__be16 reserved;
-	__be32 spi;
-	__be32 seq_no;           /* Sequence number */
-	__u8  auth_data[0];     /* Length variable but >=4. Mind the 64 bit alignment! */
-};
-
-struct ipv6_esp_hdr {
-	__be32 spi;
-	__be32 seq_no;           /* Sequence number */
-	__u8  enc_data[0];      /* Length variable but >=8. Mind the 64 bit alignment! */
-};
-
-struct ipv6_comp_hdr {
-	__u8 nexthdr;
-	__u8 flags;
-	__be16 cpi;
-};
-
 /*
  *	IPv6 fixed header
  *
diff --git a/include/net/ah.h b/include/net/ah.h
index 5e758c2b5dd..ae1c322f424 100644
--- a/include/net/ah.h
+++ b/include/net/ah.h
@@ -38,4 +38,11 @@ out:
 	return err;
 }
 
+struct ip_auth_hdr;
+
+static inline struct ip_auth_hdr *ip_auth_hdr(const struct sk_buff *skb)
+{
+	return (struct ip_auth_hdr *)skb_transport_header(skb);
+}
+
 #endif
diff --git a/include/net/esp.h b/include/net/esp.h
index e793d769430..c1bc529809d 100644
--- a/include/net/esp.h
+++ b/include/net/esp.h
@@ -53,4 +53,11 @@ static inline int esp_mac_digest(struct esp_data *esp, struct sk_buff *skb,
 	return crypto_hash_final(&desc, esp->auth.work_icv);
 }
 
+struct ip_esp_hdr;
+
+static inline struct ip_esp_hdr *ip_esp_hdr(const struct sk_buff *skb)
+{
+	return (struct ip_esp_hdr *)skb_transport_header(skb);
+}
+
 #endif
diff --git a/include/net/ipcomp.h b/include/net/ipcomp.h
index 87c1af3e5e8..330b74e813a 100644
--- a/include/net/ipcomp.h
+++ b/include/net/ipcomp.h
@@ -1,14 +1,23 @@
 #ifndef _NET_IPCOMP_H
 #define _NET_IPCOMP_H
 
-#include <linux/crypto.h>
 #include <linux/types.h>
 
 #define IPCOMP_SCRATCH_SIZE     65400
 
+struct crypto_comp;
+
 struct ipcomp_data {
 	u16 threshold;
 	struct crypto_comp **tfms;
 };
 
+struct ip_comp_hdr;
+struct sk_buff;
+
+static inline struct ip_comp_hdr *ip_comp_hdr(const struct sk_buff *skb)
+{
+	return (struct ip_comp_hdr *)skb_transport_header(skb);
+}
+
 #endif