[IPSEC]: Fix build when ipsec is disabled.

include/net/ah.h

+#ifndef _NET_AH_H
+#define _NET_AH_H
+
+#include <net/xfrm.h>
+
+struct ah_data
+{
+	u8			*key;
+	int			key_len;
+	u8			*work_icv;
+	int			icv_full_len;
+	int			icv_trunc_len;
+
+	void			(*icv)(struct ah_data*,
+	                               struct sk_buff *skb, u8 *icv);
+
+	struct crypto_tfm	*tfm;
+};
+
+extern void skb_ah_walk(const struct sk_buff *skb,
+                        struct crypto_tfm *tfm, icv_update_fn_t icv_update);
+
+static inline void
+ah_hmac_digest(struct ah_data *ahp, struct sk_buff *skb, u8 *auth_data)
+{
+	struct crypto_tfm *tfm = ahp->tfm;
+
+	memset(auth_data, 0, ahp->icv_trunc_len);
+	crypto_hmac_init(tfm, ahp->key, &ahp->key_len);
+	skb_ah_walk(skb, tfm, crypto_hmac_update);
+	crypto_hmac_final(tfm, ahp->key, &ahp->key_len, ahp->work_icv);
+	memcpy(auth_data, ahp->work_icv, ahp->icv_trunc_len);
+}
+
+#endif

include/net/esp.h

+#ifndef _NET_ESP_H
+#define _NET_ESP_H
+
+#include <net/xfrm.h>
+
+struct esp_data
+{
+	/* Confidentiality */
+	struct {
+		u8			*key;		/* Key */
+		int			key_len;	/* Key length */
+		u8			*ivec;		/* ivec buffer */
+		/* ivlen is offset from enc_data, where encrypted data start.
+		 * It is logically different of crypto_tfm_alg_ivsize(tfm).
+		 * We assume that it is either zero (no ivec), or
+		 * >= crypto_tfm_alg_ivsize(tfm). */
+		int			ivlen;
+		int			padlen;		/* 0..255 */
+		struct crypto_tfm	*tfm;		/* crypto handle */
+	} conf;
+
+	/* Integrity. It is active when icv_full_len != 0 */
+	struct {
+		u8			*key;		/* Key */
+		int			key_len;	/* Length of the key */
+		u8			*work_icv;
+		int			icv_full_len;
+		int			icv_trunc_len;
+		void			(*icv)(struct esp_data*,
+		                               struct sk_buff *skb,
+		                               int offset, int len, u8 *icv);
+		struct crypto_tfm	*tfm;
+	} auth;
+};
+
+extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm,
+			 int offset, int len, icv_update_fn_t icv_update);
+extern int skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg, int offset, int len);
+extern int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer);
+extern void *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len);
+
+static inline void
+esp_hmac_digest(struct esp_data *esp, struct sk_buff *skb, int offset,
+                int len, u8 *auth_data)
+{
+	struct crypto_tfm *tfm = esp->auth.tfm;
+	char *icv = esp->auth.work_icv;
+
+	memset(auth_data, 0, esp->auth.icv_trunc_len);
+	crypto_hmac_init(tfm, esp->auth.key, &esp->auth.key_len);
+	skb_icv_walk(skb, tfm, offset, len, crypto_hmac_update);
+	crypto_hmac_final(tfm, esp->auth.key, &esp->auth.key_len, icv);
+	memcpy(auth_data, icv, esp->auth.icv_trunc_len);
+}
+
+#endif

include/net/xfrm.h

@@ -492,85 +492,8 @@ extern int xfrm6_register_type(struct xfrm_type *type);
 extern int xfrm6_unregister_type(struct xfrm_type *type);
 extern struct xfrm_type *xfrm6_get_type(u8 proto);
 
-struct ah_data
-{
-	u8			*key;
-	int			key_len;
-	u8			*work_icv;
-	int			icv_full_len;
-	int			icv_trunc_len;
-
-	void			(*icv)(struct ah_data*,
-	                               struct sk_buff *skb, u8 *icv);
-
-	struct crypto_tfm	*tfm;
-};
-
-struct esp_data
-{
-	/* Confidentiality */
-	struct {
-		u8			*key;		/* Key */
-		int			key_len;	/* Key length */
-		u8			*ivec;		/* ivec buffer */
-		/* ivlen is offset from enc_data, where encrypted data start.
-		 * It is logically different of crypto_tfm_alg_ivsize(tfm).
-		 * We assume that it is either zero (no ivec), or
-		 * >= crypto_tfm_alg_ivsize(tfm). */
-		int			ivlen;
-		int			padlen;		/* 0..255 */
-		struct crypto_tfm	*tfm;		/* crypto handle */
-	} conf;
-
-	/* Integrity. It is active when icv_full_len != 0 */
-	struct {
-		u8			*key;		/* Key */
-		int			key_len;	/* Length of the key */
-		u8			*work_icv;
-		int			icv_full_len;
-		int			icv_trunc_len;
-		void			(*icv)(struct esp_data*,
-		                               struct sk_buff *skb,
-		                               int offset, int len, u8 *icv);
-		struct crypto_tfm	*tfm;
-	} auth;
-};
-
+struct crypto_tfm;
 typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int);
-extern void skb_ah_walk(const struct sk_buff *skb,
-                        struct crypto_tfm *tfm, icv_update_fn_t icv_update);
-extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm,
-			int offset, int len, icv_update_fn_t icv_update);
-extern int skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg, int offset, int len);
-extern int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer);
-extern void *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len);
-
-static inline void
-ah_hmac_digest(struct ah_data *ahp, struct sk_buff *skb, u8 *auth_data)
-{
-	struct crypto_tfm *tfm = ahp->tfm;
-
-	memset(auth_data, 0, ahp->icv_trunc_len);
-	crypto_hmac_init(tfm, ahp->key, &ahp->key_len);
-	skb_ah_walk(skb, tfm, crypto_hmac_update);
-	crypto_hmac_final(tfm, ahp->key, &ahp->key_len, ahp->work_icv);
-	memcpy(auth_data, ahp->work_icv, ahp->icv_trunc_len);
-}
-
-static inline void
-esp_hmac_digest(struct esp_data *esp, struct sk_buff *skb, int offset,
-                int len, u8 *auth_data)
-{
-	struct crypto_tfm *tfm = esp->auth.tfm;
-	char *icv = esp->auth.work_icv;
-
-	memset(auth_data, 0, esp->auth.icv_trunc_len);
-	crypto_hmac_init(tfm, esp->auth.key, &esp->auth.key_len);
-	skb_icv_walk(skb, tfm, offset, len, crypto_hmac_update);
-	crypto_hmac_final(tfm, esp->auth.key, &esp->auth.key_len, icv);
-	memcpy(auth_data, icv, esp->auth.icv_trunc_len);
-}
-
 
 typedef int (xfrm_dst_lookup_t)(struct xfrm_dst **dst, struct flowi *fl);
 int xfrm_dst_lookup_register(xfrm_dst_lookup_t *dst_lookup, unsigned short family);

net/ipv4/ah.c

@@ -2,6 +2,7 @@
 #include <linux/module.h>
 #include <net/ip.h>
 #include <net/xfrm.h>
+#include <net/ah.h>
 #include <linux/crypto.h>
 #include <linux/pfkeyv2.h>
 #include <net/icmp.h>

net/ipv4/esp.c

@@ -2,6 +2,7 @@
 #include <linux/module.h>
 #include <net/ip.h>
 #include <net/xfrm.h>
+#include <net/esp.h>
 #include <asm/scatterlist.h>
 #include <linux/crypto.h>
 #include <linux/pfkeyv2.h>

net/ipv4/xfrm_algo.c

@@ -12,6 +12,12 @@
 #include <linux/kernel.h>
 #include <linux/pfkeyv2.h>
 #include <net/xfrm.h>
+#if defined(CONFIG_INET_AH) || defined(CONFIG_INET_AH_MODULE) || defined(CONFIG_INET6_AH) || defined(CONFIG_INET6_AH_MODULE)
+#include <net/ah.h>
+#endif
+#if defined(CONFIG_INET_ESP) || defined(CONFIG_INET_ESP_MODULE) || defined(CONFIG_INET6_ESP) || defined(CONFIG_INET6_ESP_MODULE)
+#include <net/esp.h>
+#endif
 #include <asm/scatterlist.h>
 
 /*

net/ipv6/ah6.c

@@ -28,6 +28,7 @@
 #include <linux/module.h>
 #include <net/ip.h>
 #include <net/xfrm.h>
+#include <net/ah.h>
 #include <linux/crypto.h>
 #include <linux/pfkeyv2.h>
 #include <net/icmp.h>

net/ipv6/esp6.c

@@ -28,6 +28,7 @@
 #include <linux/module.h>
 #include <net/ip.h>
 #include <net/xfrm.h>
+#include <net/esp.h>
 #include <asm/scatterlist.h>
 #include <linux/crypto.h>
 #include <linux/pfkeyv2.h>

net/netsyms.c

@@ -54,6 +54,12 @@ extern __u32 sysctl_rmem_max;
 #include <linux/mroute.h>
 #include <linux/igmp.h>
 #include <net/xfrm.h>
+#if defined(CONFIG_INET_AH) || defined(CONFIG_INET_AH_MODULE) || defined(CONFIG_INET6_AH) || defined(CONFIG_INET6_AH_MODULE)
+#include <net/ah.h>
+#endif
+#if defined(CONFIG_INET_ESP) || defined(CONFIG_INET_ESP_MODULE) || defined(CONFIG_INET6_ESP) || defined(CONFIG_INET6_ESP_MODULE)
+#include <net/esp.h>
+#endif
 
 extern struct net_proto_family inet_family_ops;