[SK_BUFF]: Introduce skb_transport_offset()

For the quite common 'skb->h.raw - skb->data' sequence.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

12 files changed, 24 insertions, 25 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 99f1572..f7f7e56 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1156,7 +1156,7 @@ EXPORT_SYMBOL(netif_device_attach);
 int skb_checksum_help(struct sk_buff *skb)
 {
 	__wsum csum;
-	int ret = 0, offset = skb->h.raw - skb->data;
+	int ret = 0, offset = skb_transport_offset(skb);
 
 	if (skb->ip_summed == CHECKSUM_COMPLETE)
 		goto out_set_summed;
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 1493c95..b242020 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -1348,7 +1348,7 @@ void skb_copy_and_csum_dev(const struct sk_buff *skb, u8 *to)
 	long csstart;
 
 	if (skb->ip_summed == CHECKSUM_PARTIAL)
-		csstart = skb->h.raw - skb->data;
+		csstart = skb_transport_offset(skb);
 	else
 		csstart = skb_headlen(skb);
 
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index ed3deed..9576745 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -27,7 +27,7 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
 	int nfrags;
 
 	/* Strip IP+ESP header. */
-	__skb_pull(skb, skb->h.raw - skb->data);
+	__skb_pull(skb, skb_transport_offset(skb));
 	/* Now skb is pure payload to encrypt */
 
 	err = -ENOMEM;
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 13739cd..13875e8 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -435,7 +435,7 @@ static void udp4_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
 		 * fragments on the socket so that all csums of sk_buffs
 		 * should be together
 		 */
-		offset = skb->h.raw - skb->data;
+		offset = skb_transport_offset(skb);
 		skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
 
 		skb->ip_summed = CHECKSUM_NONE;
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index 7aff380..3590586 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -42,21 +42,18 @@
 static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
 {
 	int err;
-	int hdr_len;
 	struct ipv6hdr *top_iph;
 	struct ipv6_esp_hdr *esph;
 	struct crypto_blkcipher *tfm;
 	struct blkcipher_desc desc;
-	struct esp_data *esp;
 	struct sk_buff *trailer;
 	int blksize;
 	int clen;
 	int alen;
 	int nfrags;
-
-	esp = x->data;
-	hdr_len = skb->h.raw - skb->data +
-		  sizeof(*esph) + esp->conf.ivlen;
+	struct esp_data *esp = x->data;
+	int hdr_len = (skb_transport_offset(skb) +
+		       sizeof(*esph) + esp->conf.ivlen);
 
 	/* Strip IP+ESP header. */
 	__skb_pull(skb, hdr_len);
diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c
index dab069b..1bda029 100644
--- a/net/ipv6/exthdrs.c
+++ b/net/ipv6/exthdrs.c
@@ -146,7 +146,7 @@ static int ip6_parse_tlv(struct tlvtype_proc *procs, struct sk_buff **skbp)
 	int off = skb->h.raw - skb->nh.raw;
 	int len = ((skb->h.raw[1]+1)<<3);
 
-	if ((skb->h.raw + len) - skb->data > skb_headlen(skb))
+	if (skb_transport_offset(skb) + len > skb_headlen(skb))
 		goto bad;
 
 	off += 2;
@@ -288,8 +288,9 @@ static int ipv6_destopt_rcv(struct sk_buff **skbp)
 #endif
 	struct dst_entry *dst;
 
-	if (!pskb_may_pull(skb, (skb->h.raw-skb->data)+8) ||
-	    !pskb_may_pull(skb, (skb->h.raw-skb->data)+((skb->h.raw[1]+1)<<3))) {
+	if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) ||
+	    !pskb_may_pull(skb, (skb_transport_offset(skb) +
+				 ((skb->h.raw[1] + 1) << 3)))) {
 		IP6_INC_STATS_BH(ip6_dst_idev(skb->dst),
 				 IPSTATS_MIB_INHDRERRORS);
 		kfree_skb(skb);
@@ -387,8 +388,9 @@ static int ipv6_rthdr_rcv(struct sk_buff **skbp)
 
 	in6_dev_put(idev);
 
-	if (!pskb_may_pull(skb, (skb->h.raw-skb->data)+8) ||
-	    !pskb_may_pull(skb, (skb->h.raw-skb->data)+((skb->h.raw[1]+1)<<3))) {
+	if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) ||
+	    !pskb_may_pull(skb, (skb_transport_offset(skb) +
+				 ((skb->h.raw[1] + 1) << 3)))) {
 		IP6_INC_STATS_BH(ip6_dst_idev(skb->dst),
 				 IPSTATS_MIB_INHDRERRORS);
 		kfree_skb(skb);
diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index 2dd32a2..4427541 100644
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -160,7 +160,7 @@ static inline int ip6_input_finish(struct sk_buff *skb)
 	rcu_read_lock();
 resubmit:
 	idev = ip6_dst_idev(skb->dst);
-	if (!pskb_pull(skb, skb->h.raw - skb->data))
+	if (!pskb_pull(skb, skb_transport_offset(skb)))
 		goto discard;
 	nhoff = IP6CB(skb)->nhoff;
 	nexthdr = skb_network_header(skb)[nhoff];
diff --git a/net/ipv6/ipcomp6.c b/net/ipv6/ipcomp6.c
index e2404a6..4a65016 100644
--- a/net/ipv6/ipcomp6.c
+++ b/net/ipv6/ipcomp6.c
@@ -124,15 +124,13 @@ static int ipcomp6_output(struct xfrm_state *x, struct sk_buff *skb)
 {
 	int err;
 	struct ipv6hdr *top_iph;
-	int hdr_len;
 	struct ipv6_comp_hdr *ipch;
 	struct ipcomp_data *ipcd = x->data;
 	int plen, dlen;
 	u8 *start, *scratch;
 	struct crypto_comp *tfm;
 	int cpu;
-
-	hdr_len = skb->h.raw - skb->data;
+	int hdr_len = skb_transport_offset(skb);
 
 	/* check whether datagram len is larger than threshold */
 	if ((skb->len - hdr_len) < ipcd->threshold) {
diff --git a/net/ipv6/mip6.c b/net/ipv6/mip6.c
index 7b5f9d8..8520289 100644
--- a/net/ipv6/mip6.c
+++ b/net/ipv6/mip6.c
@@ -90,8 +90,9 @@ int mip6_mh_filter(struct sock *sk, struct sk_buff *skb)
 {
 	struct ip6_mh *mh;
 
-	if (!pskb_may_pull(skb, (skb->h.raw - skb->data) + 8) ||
-	    !pskb_may_pull(skb, (skb->h.raw - skb->data) + ((skb->h.raw[1] + 1) << 3)))
+	if (!pskb_may_pull(skb, (skb_transport_offset(skb)) + 8) ||
+	    !pskb_may_pull(skb, (skb_transport_offset(skb) +
+				 ((skb->h.raw[1] + 1) << 3))))
 		return -1;
 
 	mh = (struct ip6_mh *)skb->h.raw;
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 0e2b56c..bb049f1 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -513,7 +513,7 @@ static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl,
 			if (csum_skb)
 				continue;
 
-			len = skb->len - (skb->h.raw - skb->data);
+			len = skb->len - skb_transport_offset(skb);
 			if (offset >= len) {
 				offset -= len;
 				continue;
@@ -525,7 +525,7 @@ static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl,
 		skb = csum_skb;
 	}
 
-	offset += skb->h.raw - skb->data;
+	offset += skb_transport_offset(skb);
 	if (skb_copy_bits(skb, offset, &csum, 2))
 		BUG();
 
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index 2594f0f..ef29a7b 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -718,7 +718,8 @@ static int ipv6_frag_rcv(struct sk_buff **skbp)
 		icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb->h.raw-skb->nh.raw);
 		return -1;
 	}
-	if (!pskb_may_pull(skb, (skb->h.raw-skb->data)+sizeof(struct frag_hdr))) {
+	if (!pskb_may_pull(skb, (skb_transport_offset(skb) +
+				 sizeof(struct frag_hdr)))) {
 		IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INHDRERRORS);
 		icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb->h.raw-skb->nh.raw);
 		return -1;
diff --git a/net/sctp/input.c b/net/sctp/input.c
index 595fe32..9311b5d 100644
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -141,7 +141,7 @@ int sctp_rcv(struct sk_buff *skb)
 	sh = (struct sctphdr *) skb->h.raw;
 
 	/* Pull up the IP and SCTP headers. */
-	__skb_pull(skb, skb->h.raw - skb->data);
+	__skb_pull(skb, skb_transport_offset(skb));
 	if (skb->len < sizeof(struct sctphdr))
 		goto discard_it;
 	if ((skb->ip_summed != CHECKSUM_UNNECESSARY) &&