diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 4ca60c3..5d35a4c 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -96,27 +96,6 @@
 	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 5e758c2..ae1c322 100644
--- a/include/net/ah.h
+++ b/include/net/ah.h
@@ -38,4 +38,11 @@
 	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 e793d769..c1bc529 100644
--- a/include/net/esp.h
+++ b/include/net/esp.h
@@ -53,4 +53,11 @@
 	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 87c1af3..330b74e 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
diff --git a/net/ipv4/ah4.c b/net/ipv4/ah4.c
index e4f7aa39..d697064 100644
--- a/net/ipv4/ah4.c
+++ b/net/ipv4/ah4.c
@@ -82,7 +82,7 @@
 			goto error;
 	}
 
-	ah = (struct ip_auth_hdr *)skb_transport_header(skb);
+	ah = ip_auth_hdr(skb);
 	ah->nexthdr = *skb_mac_header(skb);
 	*skb_mac_header(skb) = IPPROTO_AH;
 
@@ -93,8 +93,7 @@
 	top_iph->check = 0;
 
 	ahp = x->data;
-	ah->hdrlen  = (XFRM_ALIGN8(sizeof(struct ip_auth_hdr) +
-				   ahp->icv_trunc_len) >> 2) - 2;
+	ah->hdrlen  = (XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2;
 
 	ah->reserved = 0;
 	ah->spi = x->id.spi;
@@ -134,15 +133,15 @@
 	struct ah_data *ahp;
 	char work_buf[60];
 
-	if (!pskb_may_pull(skb, sizeof(struct ip_auth_hdr)))
+	if (!pskb_may_pull(skb, sizeof(*ah)))
 		goto out;
 
-	ah = (struct ip_auth_hdr*)skb->data;
+	ah = (struct ip_auth_hdr *)skb->data;
 	ahp = x->data;
 	ah_hlen = (ah->hdrlen + 2) << 2;
 
-	if (ah_hlen != XFRM_ALIGN8(sizeof(struct ip_auth_hdr) + ahp->icv_full_len) &&
-	    ah_hlen != XFRM_ALIGN8(sizeof(struct ip_auth_hdr) + ahp->icv_trunc_len))
+	if (ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_full_len) &&
+	    ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len))
 		goto out;
 
 	if (!pskb_may_pull(skb, ah_hlen))
@@ -156,7 +155,7 @@
 
 	skb->ip_summed = CHECKSUM_NONE;
 
-	ah = (struct ip_auth_hdr*)skb->data;
+	ah = (struct ip_auth_hdr *)skb->data;
 	iph = ip_hdr(skb);
 
 	ihl = skb->data - skb_network_header(skb);
@@ -266,7 +265,8 @@
 	if (!ahp->work_icv)
 		goto error;
 
-	x->props.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) + ahp->icv_trunc_len);
+	x->props.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) +
+					  ahp->icv_trunc_len);
 	if (x->props.mode == XFRM_MODE_TUNNEL)
 		x->props.header_len += sizeof(struct iphdr);
 	x->data = ahp;
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index 93153d1..66eb496 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -60,7 +60,7 @@
 
 	skb_push(skb, -skb_network_offset(skb));
 	top_iph = ip_hdr(skb);
-	esph = (struct ip_esp_hdr *)skb_transport_header(skb);
+	esph = ip_esp_hdr(skb);
 	top_iph->tot_len = htons(skb->len + alen);
 	*(skb_tail_pointer(trailer) - 1) = *skb_mac_header(skb);
 	*skb_mac_header(skb) = IPPROTO_ESP;
@@ -157,7 +157,7 @@
 	struct sk_buff *trailer;
 	int blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4);
 	int alen = esp->auth.icv_trunc_len;
-	int elen = skb->len - sizeof(struct ip_esp_hdr) - esp->conf.ivlen - alen;
+	int elen = skb->len - sizeof(*esph) - esp->conf.ivlen - alen;
 	int nfrags;
 	int ihl;
 	u8 nexthdr[2];
@@ -165,7 +165,7 @@
 	int padlen;
 	int err;
 
-	if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr)))
+	if (!pskb_may_pull(skb, sizeof(*esph)))
 		goto out;
 
 	if (elen <= 0 || (elen & (blksize-1)))
@@ -193,7 +193,7 @@
 
 	skb->ip_summed = CHECKSUM_NONE;
 
-	esph = (struct ip_esp_hdr*)skb->data;
+	esph = (struct ip_esp_hdr *)skb->data;
 
 	/* Get ivec. This can be wrong, check against another impls. */
 	if (esp->conf.ivlen)
@@ -206,7 +206,7 @@
 		if (!sg)
 			goto out;
 	}
-	skb_to_sgvec(skb, sg, sizeof(struct ip_esp_hdr) + esp->conf.ivlen, elen);
+	skb_to_sgvec(skb, sg, sizeof(*esph) + esp->conf.ivlen, elen);
 	err = crypto_blkcipher_decrypt(&desc, sg, sg, elen);
 	if (unlikely(sg != &esp->sgbuf[0]))
 		kfree(sg);
diff --git a/net/ipv4/ipcomp.c b/net/ipv4/ipcomp.c
index bf74f64..78d6ddb 100644
--- a/net/ipv4/ipcomp.c
+++ b/net/ipv4/ipcomp.c
@@ -154,7 +154,7 @@
 
 	/* Install ipcomp header, convert into ipcomp datagram. */
 	iph->tot_len = htons(skb->len);
-	ipch = (struct ip_comp_hdr *)skb_transport_header(skb);
+	ipch = ip_comp_hdr(skb);
 	ipch->nexthdr = *skb_mac_header(skb);
 	ipch->flags = 0;
 	ipch->cpi = htons((u16 )ntohl(x->id.spi));
diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c
index ac6bae1..f9f6891 100644
--- a/net/ipv6/ah6.c
+++ b/net/ipv6/ah6.c
@@ -270,7 +270,7 @@
 			goto error_free_iph;
 	}
 
-	ah = (struct ip_auth_hdr *)skb_transport_header(skb);
+	ah = ip_auth_hdr(skb);
 	ah->nexthdr = nexthdr;
 
 	top_iph->priority    = 0;
@@ -280,8 +280,7 @@
 	top_iph->hop_limit   = 0;
 
 	ahp = x->data;
-	ah->hdrlen  = (XFRM_ALIGN8(sizeof(struct ipv6_auth_hdr) +
-				   ahp->icv_trunc_len) >> 2) - 2;
+	ah->hdrlen  = (XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2;
 
 	ah->reserved = 0;
 	ah->spi = x->id.spi;
@@ -327,7 +326,7 @@
 	 * There is offset of AH before IPv6 header after the process.
 	 */
 
-	struct ipv6_auth_hdr *ah;
+	struct ip_auth_hdr *ah;
 	struct ipv6hdr *ip6h;
 	struct ah_data *ahp;
 	unsigned char *tmp_hdr = NULL;
@@ -346,13 +345,13 @@
 		goto out;
 
 	hdr_len = skb->data - skb_network_header(skb);
-	ah = (struct ipv6_auth_hdr*)skb->data;
+	ah = (struct ip_auth_hdr *)skb->data;
 	ahp = x->data;
 	nexthdr = ah->nexthdr;
 	ah_hlen = (ah->hdrlen + 2) << 2;
 
-	if (ah_hlen != XFRM_ALIGN8(sizeof(struct ipv6_auth_hdr) + ahp->icv_full_len) &&
-	    ah_hlen != XFRM_ALIGN8(sizeof(struct ipv6_auth_hdr) + ahp->icv_trunc_len))
+	if (ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_full_len) &&
+	    ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len))
 		goto out;
 
 	if (!pskb_may_pull(skb, ah_hlen))
@@ -474,7 +473,8 @@
 	if (!ahp->work_icv)
 		goto error;
 
-	x->props.header_len = XFRM_ALIGN8(sizeof(struct ipv6_auth_hdr) + ahp->icv_trunc_len);
+	x->props.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) +
+					  ahp->icv_trunc_len);
 	if (x->props.mode == XFRM_MODE_TUNNEL)
 		x->props.header_len += sizeof(struct ipv6hdr);
 	x->data = ahp;
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index 21c93f0..a64295d 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -44,7 +44,7 @@
 {
 	int err;
 	struct ipv6hdr *top_iph;
-	struct ipv6_esp_hdr *esph;
+	struct ip_esp_hdr *esph;
 	struct crypto_blkcipher *tfm;
 	struct blkcipher_desc desc;
 	struct sk_buff *trailer;
@@ -86,7 +86,7 @@
 
 	skb_push(skb, -skb_network_offset(skb));
 	top_iph = ipv6_hdr(skb);
-	esph = (struct ipv6_esp_hdr *)skb_transport_header(skb);
+	esph = ip_esp_hdr(skb);
 	top_iph->payload_len = htons(skb->len + alen - sizeof(*top_iph));
 	*(skb_tail_pointer(trailer) - 1) = *skb_mac_header(skb);
 	*skb_mac_header(skb) = IPPROTO_ESP;
@@ -142,19 +142,19 @@
 static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
 {
 	struct ipv6hdr *iph;
-	struct ipv6_esp_hdr *esph;
+	struct ip_esp_hdr *esph;
 	struct esp_data *esp = x->data;
 	struct crypto_blkcipher *tfm = esp->conf.tfm;
 	struct blkcipher_desc desc = { .tfm = tfm };
 	struct sk_buff *trailer;
 	int blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4);
 	int alen = esp->auth.icv_trunc_len;
-	int elen = skb->len - sizeof(struct ipv6_esp_hdr) - esp->conf.ivlen - alen;
+	int elen = skb->len - sizeof(*esph) - esp->conf.ivlen - alen;
 	int hdr_len = skb_network_header_len(skb);
 	int nfrags;
 	int ret = 0;
 
-	if (!pskb_may_pull(skb, sizeof(struct ipv6_esp_hdr))) {
+	if (!pskb_may_pull(skb, sizeof(*esph))) {
 		ret = -EINVAL;
 		goto out;
 	}
@@ -189,7 +189,7 @@
 
 	skb->ip_summed = CHECKSUM_NONE;
 
-	esph = (struct ipv6_esp_hdr*)skb->data;
+	esph = (struct ip_esp_hdr *)skb->data;
 	iph = ipv6_hdr(skb);
 
 	/* Get ivec. This can be wrong, check against another impls. */
@@ -208,7 +208,7 @@
 				goto out;
 			}
 		}
-		skb_to_sgvec(skb, sg, sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen, elen);
+		skb_to_sgvec(skb, sg, sizeof(*esph) + esp->conf.ivlen, elen);
 		ret = crypto_blkcipher_decrypt(&desc, sg, sg, elen);
 		if (unlikely(sg != &esp->sgbuf[0]))
 			kfree(sg);
@@ -260,7 +260,7 @@
 		     int type, int code, int offset, __be32 info)
 {
 	struct ipv6hdr *iph = (struct ipv6hdr*)skb->data;
-	struct ipv6_esp_hdr *esph = (struct ipv6_esp_hdr*)(skb->data+offset);
+	struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data + offset);
 	struct xfrm_state *x;
 
 	if (type != ICMPV6_DEST_UNREACH &&
@@ -356,7 +356,7 @@
 	if (crypto_blkcipher_setkey(tfm, x->ealg->alg_key,
 				    (x->ealg->alg_key_len + 7) / 8))
 		goto error;
-	x->props.header_len = sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen;
+	x->props.header_len = sizeof(struct ip_esp_hdr) + esp->conf.ivlen;
 	if (x->props.mode == XFRM_MODE_TUNNEL)
 		x->props.header_len += sizeof(struct ipv6hdr);
 	x->data = esp;
diff --git a/net/ipv6/ipcomp6.c b/net/ipv6/ipcomp6.c
index 87e6407..8f3f32f 100644
--- a/net/ipv6/ipcomp6.c
+++ b/net/ipv6/ipcomp6.c
@@ -65,7 +65,7 @@
 static int ipcomp6_input(struct xfrm_state *x, struct sk_buff *skb)
 {
 	int err = -ENOMEM;
-	struct ipv6_comp_hdr *ipch;
+	struct ip_comp_hdr *ipch;
 	int plen, dlen;
 	struct ipcomp_data *ipcd = x->data;
 	u8 *start, *scratch;
@@ -92,12 +92,10 @@
 	tfm = *per_cpu_ptr(ipcd->tfms, cpu);
 
 	err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen);
-	if (err) {
-		err = -EINVAL;
+	if (err)
 		goto out_put_cpu;
-	}
 
-	if (dlen < (plen + sizeof(struct ipv6_comp_hdr))) {
+	if (dlen < (plen + sizeof(*ipch))) {
 		err = -EINVAL;
 		goto out_put_cpu;
 	}
@@ -122,7 +120,7 @@
 {
 	int err;
 	struct ipv6hdr *top_iph;
-	struct ipv6_comp_hdr *ipch;
+	struct ip_comp_hdr *ipch;
 	struct ipcomp_data *ipcd = x->data;
 	int plen, dlen;
 	u8 *start, *scratch;
@@ -151,7 +149,7 @@
 	tfm = *per_cpu_ptr(ipcd->tfms, cpu);
 
 	err = crypto_comp_compress(tfm, start, plen, scratch, &dlen);
-	if (err || (dlen + sizeof(struct ipv6_comp_hdr)) >= plen) {
+	if (err || (dlen + sizeof(*ipch)) >= plen) {
 		put_cpu();
 		goto out_ok;
 	}
@@ -164,7 +162,7 @@
 
 	top_iph->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
 
-	ipch = (struct ipv6_comp_hdr *)start;
+	ipch = ip_comp_hdr(skb);
 	ipch->nexthdr = *skb_mac_header(skb);
 	ipch->flags = 0;
 	ipch->cpi = htons((u16 )ntohl(x->id.spi));
@@ -179,7 +177,8 @@
 {
 	__be32 spi;
 	struct ipv6hdr *iph = (struct ipv6hdr*)skb->data;
-	struct ipv6_comp_hdr *ipcomph = (struct ipv6_comp_hdr*)(skb->data+offset);
+	struct ip_comp_hdr *ipcomph =
+		(struct ip_comp_hdr *)(skb->data + offset);
 	struct xfrm_state *x;
 
 	if (type != ICMPV6_DEST_UNREACH && type != ICMPV6_PKT_TOOBIG)