[SK_BUFF]: Introduce tcp_hdr(), remove skb->h.th

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

drivers/net/atl1/atl1_main.c

@@ -1298,9 +1298,10 @@ static int atl1_tso(struct atl1_adapter *adapter, struct sk_buff *skb,
 
 			iph->tot_len = 0;
 			iph->check = 0;
-			skb->h.th->check = ~csum_tcpudp_magic(iph->saddr,
+			tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
-							      iph->daddr, 0,
+								 iph->daddr, 0,
-							      IPPROTO_TCP, 0);
+								 IPPROTO_TCP,
+								 0);
 			ipofst = skb_network_offset(skb);
 			if (ipofst != ENET_HEADER_SIZE) /* 802.3 frame */
 				tso->tsopl |= 1 << TSO_PARAM_ETHTYPE_SHIFT;

drivers/net/bnx2.c

@@ -4524,7 +4524,7 @@ bnx2_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		vlan_tag_flags |= TX_BD_FLAGS_SW_LSO;
 
 		tcp_opt_len = 0;
-		if (skb->h.th->doff > 5)
+		if (tcp_hdr(skb)->doff > 5)
 			tcp_opt_len = tcp_optlen(skb);
 
 		ip_tcp_len = ip_hdrlen(skb) + sizeof(struct tcphdr);
@@ -4532,9 +4532,9 @@ bnx2_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		iph = ip_hdr(skb);
 		iph->check = 0;
 		iph->tot_len = htons(mss + ip_tcp_len + tcp_opt_len);
-		skb->h.th->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
+		tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
-						      0, IPPROTO_TCP, 0);
+							 iph->daddr, 0,
-
+							 IPPROTO_TCP, 0);
 		if (tcp_opt_len || (iph->ihl > 5)) {
 			vlan_tag_flags |= ((iph->ihl - 5) +
 					   (tcp_opt_len >> 2)) << 8;

drivers/net/chelsio/sge.c

@@ -1872,7 +1872,7 @@ int t1_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		hdr->opcode = CPL_TX_PKT_LSO;
 		hdr->ip_csum_dis = hdr->l4_csum_dis = 0;
 		hdr->ip_hdr_words = ip_hdr(skb)->ihl;
-		hdr->tcp_hdr_words = skb->h.th->doff;
+		hdr->tcp_hdr_words = tcp_hdr(skb)->doff;
 		hdr->eth_type_mss = htons(MK_ETH_TYPE_MSS(eth_type,
 							  skb_shinfo(skb)->gso_size));
 		hdr->len = htonl(skb->len - sizeof(*hdr));

drivers/net/cxgb3/sge.c

@@ -901,7 +901,7 @@ static void write_tx_pkt_wr(struct adapter *adap, struct sk_buff *skb,
 		    CPL_ETH_II : CPL_ETH_II_VLAN;
 		tso_info |= V_LSO_ETH_TYPE(eth_type) |
 		    V_LSO_IPHDR_WORDS(ip_hdr(skb)->ihl) |
-		    V_LSO_TCPHDR_WORDS(skb->h.th->doff);
+		    V_LSO_TCPHDR_WORDS(tcp_hdr(skb)->doff);
 		hdr->lso_info = htonl(tso_info);
 		flits = 3;
 	} else {

drivers/net/e1000/e1000_main.c

@@ -2893,14 +2893,15 @@ e1000_tso(struct e1000_adapter *adapter, struct e1000_tx_ring *tx_ring,
 			struct iphdr *iph = ip_hdr(skb);
 			iph->tot_len = 0;
 			iph->check = 0;
-			skb->h.th->check = ~csum_tcpudp_magic(iph->saddr,
+			tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
-							      iph->daddr, 0,
+								 iph->daddr, 0,
-							      IPPROTO_TCP, 0);
+								 IPPROTO_TCP,
+								 0);
 			cmd_length = E1000_TXD_CMD_IP;
 			ipcse = skb_transport_offset(skb) - 1;
 		} else if (skb->protocol == htons(ETH_P_IPV6)) {
 			ipv6_hdr(skb)->payload_len = 0;
-			skb->h.th->check =
+			tcp_hdr(skb)->check =
 				~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 						 &ipv6_hdr(skb)->daddr,
 						 0, IPPROTO_TCP, 0);
@@ -2909,7 +2910,7 @@ e1000_tso(struct e1000_adapter *adapter, struct e1000_tx_ring *tx_ring,
 		ipcss = skb_network_offset(skb);
 		ipcso = (void *)&(ip_hdr(skb)->check) - (void *)skb->data;
 		tucss = skb_transport_offset(skb);
-		tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
+		tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
 		tucse = 0;
 
 		cmd_length |= (E1000_TXD_CMD_DEXT | E1000_TXD_CMD_TSE |

drivers/net/ioc3-eth.c

@@ -1426,7 +1426,7 @@ static int ioc3_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		}
 		if (proto == IPPROTO_TCP) {
 			csoff += offsetof(struct tcphdr, check);
-			skb->h.th->check = csum;
+			tcp_hdr(skb)->check = csum;
 		}
 
 		w0 = ETXD_DOCHECKSUM | (csoff << ETXD_CHKOFF_SHIFT);

drivers/net/ixgb/ixgb_main.c

@@ -1195,13 +1195,14 @@ ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
 		iph = ip_hdr(skb);
 		iph->tot_len = 0;
 		iph->check = 0;
-		skb->h.th->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
+		tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
-						      0, IPPROTO_TCP, 0);
+							 iph->daddr, 0,
+							 IPPROTO_TCP, 0);
 		ipcss = skb_network_offset(skb);
 		ipcso = (void *)&(iph->check) - (void *)skb->data;
 		ipcse = skb_transport_offset(skb) - 1;
 		tucss = skb_transport_offset(skb);
-		tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
+		tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
 		tucse = 0;
 
 		i = adapter->tx_ring.next_to_use;

drivers/net/mv643xx_eth.c

@@ -1169,7 +1169,7 @@ static void eth_tx_submit_descs_for_skb(struct mv643xx_private *mp,
 			desc->l4i_chk = udp_hdr(skb)->check;
 			break;
 		case IPPROTO_TCP:
-			desc->l4i_chk = skb->h.th->check;
+			desc->l4i_chk = tcp_hdr(skb)->check;
 			break;
 		default:
 			BUG();

drivers/net/tg3.c

@@ -3922,7 +3922,7 @@ static int tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		base_flags |= (TXD_FLAG_CPU_PRE_DMA |
 			       TXD_FLAG_CPU_POST_DMA);
 
-		skb->h.th->check = 0;
+		tcp_hdr(skb)->check = 0;
 
 	}
 	else if (skb->ip_summed == CHECKSUM_PARTIAL)
@@ -4080,14 +4080,13 @@ static int tg3_start_xmit_dma_bug(struct sk_buff *skb, struct net_device *dev)
 		iph->check = 0;
 		iph->tot_len = htons(mss + hdr_len);
 		if (tp->tg3_flags2 & TG3_FLG2_HW_TSO) {
-			skb->h.th->check = 0;
+			tcp_hdr(skb)->check = 0;
 			base_flags &= ~TXD_FLAG_TCPUDP_CSUM;
-		}
+		} else
-		else {
+			tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
-			skb->h.th->check = ~csum_tcpudp_magic(iph->saddr,
+								 iph->daddr, 0,
-							      iph->daddr, 0,
+								 IPPROTO_TCP,
-							      IPPROTO_TCP, 0);
+								 0);
-		}
 
 		if ((tp->tg3_flags2 & TG3_FLG2_HW_TSO) ||
 		    (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5705)) {

drivers/s390/net/qeth_eddp.c

@@ -416,7 +416,7 @@ __qeth_eddp_fill_context_tcp(struct qeth_eddp_context *ctx,
                        eddp->skb_offset += VLAN_HLEN;
 #endif /* CONFIG_QETH_VLAN */
        }
-	tcph = eddp->skb->h.th;
+	tcph = tcp_hdr(eddp->skb);
 	while (eddp->skb_offset < eddp->skb->len) {
 		data_len = min((int)skb_shinfo(eddp->skb)->gso_size,
 			       (int)(eddp->skb->len - eddp->skb_offset));

drivers/s390/net/qeth_tso.h

@@ -41,7 +41,7 @@ qeth_tso_fill_header(struct qeth_card *card, struct sk_buff *skb)
 
 	hdr  = (struct qeth_hdr_tso *) skb->data;
 	iph  = ip_hdr(skb);
-	tcph = skb->h.th;
+	tcph = tcp_hdr(skb);
 	/*fix header to TSO values ...*/
 	hdr->hdr.hdr.l3.id = QETH_HEADER_TYPE_TSO;
 	/*set values which are fix for the first approach ...*/
@@ -65,7 +65,7 @@ qeth_tso_set_tcpip_header(struct qeth_card *card, struct sk_buff *skb)
 {
 	struct iphdr *iph    = ip_hdr(skb);
 	struct ipv6hdr *ip6h = ipv6_hdr(skb);
-	struct tcphdr *tcph  = skb->h.th;
+	struct tcphdr *tcph  = tcp_hdr(skb);
 
 	tcph->check = 0;
 	if (skb->protocol == ETH_P_IPV6) {

include/linux/skbuff.h

@@ -237,7 +237,6 @@ struct sk_buff {
 	/* 4 byte hole on 64 bit*/
 
 	union {
-		struct tcphdr	*th;
 		struct iphdr	*ipiph;
 		struct ipv6hdr	*ipv6h;
 		unsigned char	*raw;

include/linux/tcp.h

@@ -178,14 +178,19 @@ struct tcp_md5sig {
 #include <net/inet_connection_sock.h>
 #include <net/inet_timewait_sock.h>
 
+static inline struct tcphdr *tcp_hdr(const struct sk_buff *skb)
+{
+	return (struct tcphdr *)skb->h.raw;
+}
+
 static inline unsigned int tcp_hdrlen(const struct sk_buff *skb)
 {
-	return skb->h.th->doff * 4;
+	return tcp_hdr(skb)->doff * 4;
 }
 
 static inline unsigned int tcp_optlen(const struct sk_buff *skb)
 {
-	return (skb->h.th->doff - 5) * 4;
+	return (tcp_hdr(skb)->doff - 5) * 4;
 }
 
 /* This defines a selective acknowledgement block. */

include/net/tcp.h

@@ -984,7 +984,7 @@ static inline void tcp_openreq_init(struct request_sock *req,
 	ireq->wscale_ok = rx_opt->wscale_ok;
 	ireq->acked = 0;
 	ireq->ecn_ok = 0;
-	ireq->rmt_port = skb->h.th->source;
+	ireq->rmt_port = tcp_hdr(skb)->source;
 }
 
 extern void tcp_enter_memory_pressure(void);

include/net/tcp_ecn.h

@@ -54,7 +54,7 @@ static inline void TCP_ECN_send(struct sock *sk, struct tcp_sock *tp,
 			INET_ECN_xmit(sk);
 			if (tp->ecn_flags&TCP_ECN_QUEUE_CWR) {
 				tp->ecn_flags &= ~TCP_ECN_QUEUE_CWR;
-				skb->h.th->cwr = 1;
+				tcp_hdr(skb)->cwr = 1;
 				skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
 			}
 		} else {
@@ -62,7 +62,7 @@ static inline void TCP_ECN_send(struct sock *sk, struct tcp_sock *tp,
 			INET_ECN_dontxmit(sk);
 		}
 		if (tp->ecn_flags & TCP_ECN_DEMAND_CWR)
-			skb->h.th->ece = 1;
+			tcp_hdr(skb)->ece = 1;
 	}
 }
 
@@ -70,7 +70,7 @@ static inline void TCP_ECN_send(struct sock *sk, struct tcp_sock *tp,
 
 static inline void TCP_ECN_accept_cwr(struct tcp_sock *tp, struct sk_buff *skb)
 {
-	if (skb->h.th->cwr)
+	if (tcp_hdr(skb)->cwr)
 		tp->ecn_flags &= ~TCP_ECN_DEMAND_CWR;
 }
 

net/ipv4/ip_output.c

@@ -1352,8 +1352,8 @@ void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *ar
 						.tos = RT_TOS(ip_hdr(skb)->tos) } },
 				    /* Not quite clean, but right. */
 				    .uli_u = { .ports =
-					       { .sport = skb->h.th->dest,
+					       { .sport = tcp_hdr(skb)->dest,
-						 .dport = skb->h.th->source } },
+						 .dport = tcp_hdr(skb)->source } },
 				    .proto = sk->sk_protocol };
 		security_skb_classify_flow(skb, &fl);
 		if (ip_route_output_key(&rt, &fl))

net/ipv4/syncookies.c

@@ -125,10 +125,11 @@ static __u16 const msstab[] = {
 __u32 cookie_v4_init_sequence(struct sock *sk, struct sk_buff *skb, __u16 *mssp)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
+	const struct iphdr *iph = ip_hdr(skb);
+	const struct tcphdr *th = tcp_hdr(skb);
 	int mssind;
 	const __u16 mss = *mssp;
 
-
 	tp->last_synq_overflow = jiffies;
 
 	/* XXX sort msstab[] by probability?  Binary search? */
@@ -138,9 +139,8 @@ __u32 cookie_v4_init_sequence(struct sock *sk, struct sk_buff *skb, __u16 *mssp)
 
 	NET_INC_STATS_BH(LINUX_MIB_SYNCOOKIESSENT);
 
-	return secure_tcp_syn_cookie(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
+	return secure_tcp_syn_cookie(iph->saddr, iph->daddr,
-				     skb->h.th->source, skb->h.th->dest,
+				     th->source, th->dest, ntohl(th->seq),
-				     ntohl(skb->h.th->seq),
 				     jiffies / (HZ * 60), mssind);
 }
 
@@ -157,14 +157,13 @@ __u32 cookie_v4_init_sequence(struct sock *sk, struct sk_buff *skb, __u16 *mssp)
  */
 static inline int cookie_check(struct sk_buff *skb, __u32 cookie)
 {
-	__u32 seq;
+	const struct iphdr *iph = ip_hdr(skb);
-	__u32 mssind;
+	const struct tcphdr *th = tcp_hdr(skb);
-
+	__u32 seq = ntohl(th->seq) - 1;
-	seq = ntohl(skb->h.th->seq)-1;
+	__u32 mssind = check_tcp_syn_cookie(cookie, iph->saddr, iph->daddr,
-	mssind = check_tcp_syn_cookie(cookie,
+					    th->source, th->dest, seq,
-				      ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
+					    jiffies / (HZ * 60),
-				      skb->h.th->source, skb->h.th->dest,
+					    COUNTER_TRIES);
-				      seq, jiffies / (HZ * 60), COUNTER_TRIES);
 
 	return mssind < NUM_MSS ? msstab[mssind] + 1 : 0;
 }
@@ -191,14 +190,15 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
 	struct inet_request_sock *ireq;
 	struct tcp_request_sock *treq;
 	struct tcp_sock *tp = tcp_sk(sk);
-	__u32 cookie = ntohl(skb->h.th->ack_seq) - 1;
+	const struct tcphdr *th = tcp_hdr(skb);
+	__u32 cookie = ntohl(th->ack_seq) - 1;
 	struct sock *ret = sk;
 	struct request_sock *req;
 	int mss;
 	struct rtable *rt;
 	__u8 rcv_wscale;
 
-	if (!sysctl_tcp_syncookies || !skb->h.th->ack)
+	if (!sysctl_tcp_syncookies || !th->ack)
 		goto out;
 
 	if (time_after(jiffies, tp->last_synq_overflow + TCP_TIMEOUT_INIT) ||
@@ -220,10 +220,10 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
 	}
 	ireq = inet_rsk(req);
 	treq = tcp_rsk(req);
-	treq->rcv_isn		= ntohl(skb->h.th->seq) - 1;
+	treq->rcv_isn		= ntohl(th->seq) - 1;
 	treq->snt_isn		= cookie;
 	req->mss		= mss;
-	ireq->rmt_port		= skb->h.th->source;
+	ireq->rmt_port		= th->source;
 	ireq->loc_addr		= ip_hdr(skb)->daddr;
 	ireq->rmt_addr		= ip_hdr(skb)->saddr;
 	ireq->opt		= NULL;
@@ -261,8 +261,8 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
 						.tos = RT_CONN_FLAGS(sk) } },
 				    .proto = IPPROTO_TCP,
 				    .uli_u = { .ports =
-					       { .sport = skb->h.th->dest,
+					       { .sport = th->dest,
-						 .dport = skb->h.th->source } } };
+						 .dport = th->source } } };
 		security_req_classify_flow(req, &fl);
 		if (ip_route_output_key(&rt, &fl)) {
 			reqsk_free(req);

net/ipv4/tcp.c

@@ -425,7 +425,7 @@ int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg)
 			/* Subtract 1, if FIN is in queue. */
 			if (answ && !skb_queue_empty(&sk->sk_receive_queue))
 				answ -=
-		       ((struct sk_buff *)sk->sk_receive_queue.prev)->h.th->fin;
+		       tcp_hdr((struct sk_buff *)sk->sk_receive_queue.prev)->fin;
 		} else
 			answ = tp->urg_seq - tp->copied_seq;
 		release_sock(sk);
@@ -1016,9 +1016,9 @@ static inline struct sk_buff *tcp_recv_skb(struct sock *sk, u32 seq, u32 *off)
 
 	skb_queue_walk(&sk->sk_receive_queue, skb) {
 		offset = seq - TCP_SKB_CB(skb)->seq;
-		if (skb->h.th->syn)
+		if (tcp_hdr(skb)->syn)
 			offset--;
-		if (offset < skb->len || skb->h.th->fin) {
+		if (offset < skb->len || tcp_hdr(skb)->fin) {
 			*off = offset;
 			return skb;
 		}
@@ -1070,7 +1070,7 @@ int tcp_read_sock(struct sock *sk, read_descriptor_t *desc,
 			if (offset != skb->len)
 				break;
 		}
-		if (skb->h.th->fin) {
+		if (tcp_hdr(skb)->fin) {
 			sk_eat_skb(sk, skb, 0);
 			++seq;
 			break;
@@ -1174,11 +1174,11 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 				break;
 			}
 			offset = *seq - TCP_SKB_CB(skb)->seq;
-			if (skb->h.th->syn)
+			if (tcp_hdr(skb)->syn)
 				offset--;
 			if (offset < skb->len)
 				goto found_ok_skb;
-			if (skb->h.th->fin)
+			if (tcp_hdr(skb)->fin)
 				goto found_fin_ok;
 			BUG_TRAP(flags & MSG_PEEK);
 			skb = skb->next;
@@ -1394,7 +1394,7 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 		if (used + offset < skb->len)
 			continue;
 
-		if (skb->h.th->fin)
+		if (tcp_hdr(skb)->fin)
 			goto found_fin_ok;
 		if (!(flags & MSG_PEEK)) {
 			sk_eat_skb(sk, skb, copied_early);
@@ -1563,7 +1563,7 @@ void tcp_close(struct sock *sk, long timeout)
 	 */
 	while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 		u32 len = TCP_SKB_CB(skb)->end_seq - TCP_SKB_CB(skb)->seq -
-			  skb->h.th->fin;
+			  tcp_hdr(skb)->fin;
 		data_was_unread += len;
 		__kfree_skb(skb);
 	}
@@ -2170,7 +2170,7 @@ struct sk_buff *tcp_tso_segment(struct sk_buff *skb, int features)
 	if (!pskb_may_pull(skb, sizeof(*th)))
 		goto out;
 
-	th = skb->h.th;
+	th = tcp_hdr(skb);
 	thlen = th->doff * 4;
 	if (thlen < sizeof(*th))
 		goto out;
@@ -2210,7 +2210,7 @@ struct sk_buff *tcp_tso_segment(struct sk_buff *skb, int features)
 	delta = htonl(oldlen + (thlen + len));
 
 	skb = segs;
-	th = skb->h.th;
+	th = tcp_hdr(skb);
 	seq = ntohl(th->seq);
 
 	do {
@@ -2224,7 +2224,7 @@ struct sk_buff *tcp_tso_segment(struct sk_buff *skb, int features)
 
 		seq += len;
 		skb = skb->next;
-		th = skb->h.th;
+		th = tcp_hdr(skb);
 
 		th->seq = htonl(seq);
 		th->cwr = 0;

net/ipv4/tcp_input.c

@@ -148,7 +148,7 @@ static void tcp_measure_rcv_mss(struct sock *sk,
 		     * to handle super-low mtu links fairly.
 		     */
 		    (len >= TCP_MIN_MSS + sizeof(struct tcphdr) &&
-		     !(tcp_flag_word(skb->h.th)&TCP_REMNANT))) {
+		     !(tcp_flag_word(tcp_hdr(skb)) & TCP_REMNANT))) {
 			/* Subtract also invariant (if peer is RFC compliant),
 			 * tcp header plus fixed timestamp option length.
 			 * Resulting "len" is MSS free of SACK jitter.
@@ -2559,9 +2559,9 @@ static int tcp_ack_update_window(struct sock *sk, struct tcp_sock *tp,
 				 struct sk_buff *skb, u32 ack, u32 ack_seq)
 {
 	int flag = 0;
-	u32 nwin = ntohs(skb->h.th->window);
+	u32 nwin = ntohs(tcp_hdr(skb)->window);
 
-	if (likely(!skb->h.th->syn))
+	if (likely(!tcp_hdr(skb)->syn))
 		nwin <<= tp->rx_opt.snd_wscale;
 
 	if (tcp_may_update_window(tp, ack, ack_seq, nwin)) {
@@ -2766,7 +2766,7 @@ static int tcp_ack(struct sock *sk, struct sk_buff *skb, int flag)
 		if (TCP_SKB_CB(skb)->sacked)
 			flag |= tcp_sacktag_write_queue(sk, skb, prior_snd_una);
 
-		if (TCP_ECN_rcv_ecn_echo(tp, skb->h.th))
+		if (TCP_ECN_rcv_ecn_echo(tp, tcp_hdr(skb)))
 			flag |= FLAG_ECE;
 
 		tcp_ca_event(sk, CA_EVENT_SLOW_ACK);
@@ -2833,7 +2833,7 @@ static int tcp_ack(struct sock *sk, struct sk_buff *skb, int flag)
 void tcp_parse_options(struct sk_buff *skb, struct tcp_options_received *opt_rx, int estab)
 {
 	unsigned char *ptr;
-	struct tcphdr *th = skb->h.th;
+	struct tcphdr *th = tcp_hdr(skb);
 	int length=(th->doff*4)-sizeof(struct tcphdr);
 
 	ptr = (unsigned char *)(th + 1);
@@ -2995,7 +2995,7 @@ static inline void tcp_replace_ts_recent(struct tcp_sock *tp, u32 seq)
 static int tcp_disordered_ack(const struct sock *sk, const struct sk_buff *skb)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
-	struct tcphdr *th = skb->h.th;
+	struct tcphdr *th = tcp_hdr(skb);
 	u32 seq = TCP_SKB_CB(skb)->seq;
 	u32 ack = TCP_SKB_CB(skb)->ack_seq;
 
@@ -3357,8 +3357,8 @@ static void tcp_ofo_queue(struct sock *sk)
 		__skb_unlink(skb, &tp->out_of_order_queue);
 		__skb_queue_tail(&sk->sk_receive_queue, skb);
 		tp->rcv_nxt = TCP_SKB_CB(skb)->end_seq;
-		if (skb->h.th->fin)
+		if (tcp_hdr(skb)->fin)
-			tcp_fin(skb, sk, skb->h.th);
+			tcp_fin(skb, sk, tcp_hdr(skb));
 	}
 }
 
@@ -3366,7 +3366,7 @@ static int tcp_prune_queue(struct sock *sk);
 
 static void tcp_data_queue(struct sock *sk, struct sk_buff *skb)
 {
-	struct tcphdr *th = skb->h.th;
+	struct tcphdr *th = tcp_hdr(skb);
 	struct tcp_sock *tp = tcp_sk(sk);
 	int eaten = -1;
 
@@ -3605,7 +3605,7 @@ tcp_collapse(struct sock *sk, struct sk_buff_head *list,
 		 * - bloated or contains data before "start" or
 		 *   overlaps to the next one.
 		 */
-		if (!skb->h.th->syn && !skb->h.th->fin &&
+		if (!tcp_hdr(skb)->syn && !tcp_hdr(skb)->fin &&
 		    (tcp_win_from_space(skb->truesize) > skb->len ||
 		     before(TCP_SKB_CB(skb)->seq, start) ||
 		     (skb->next != tail &&
@@ -3616,7 +3616,7 @@ tcp_collapse(struct sock *sk, struct sk_buff_head *list,
 		start = TCP_SKB_CB(skb)->end_seq;
 		skb = skb->next;
 	}
-	if (skb == tail || skb->h.th->syn || skb->h.th->fin)
+	if (skb == tail || tcp_hdr(skb)->syn || tcp_hdr(skb)->fin)
 		return;
 
 	while (before(start, end)) {
@@ -3665,7 +3665,9 @@ tcp_collapse(struct sock *sk, struct sk_buff_head *list,
 				__kfree_skb(skb);
 				NET_INC_STATS_BH(LINUX_MIB_TCPRCVCOLLAPSED);
 				skb = next;
-				if (skb == tail || skb->h.th->syn || skb->h.th->fin)
+				if (skb == tail ||
+				    tcp_hdr(skb)->syn ||
+				    tcp_hdr(skb)->fin)
 					return;
 			}
 		}
@@ -4072,7 +4074,7 @@ static int tcp_dma_try_early_copy(struct sock *sk, struct sk_buff *skb, int hlen
 		tcp_rcv_space_adjust(sk);
 
 		if ((tp->ucopy.len == 0) ||
-		    (tcp_flag_word(skb->h.th) & TCP_FLAG_PSH) ||
+		    (tcp_flag_word(tcp_hdr(skb)) & TCP_FLAG_PSH) ||
 		    (atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1))) {
 			tp->ucopy.wakeup = 1;
 			sk->sk_data_ready(sk, 0);

net/ipv4/tcp_ipv4.c

@@ -127,8 +127,8 @@ static inline __u32 tcp_v4_init_sequence(struct sk_buff *skb)
 {
 	return secure_tcp_sequence_number(ip_hdr(skb)->daddr,
 					  ip_hdr(skb)->saddr,
-					  skb->h.th->dest,
+					  tcp_hdr(skb)->dest,
-					  skb->h.th->source);
+					  tcp_hdr(skb)->source);
 }
 
 int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp)
@@ -499,7 +499,7 @@ void tcp_v4_err(struct sk_buff *skb, u32 info)
 void tcp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb)
 {
 	struct inet_sock *inet = inet_sk(sk);
-	struct tcphdr *th = skb->h.th;
+	struct tcphdr *th = tcp_hdr(skb);
 
 	if (skb->ip_summed == CHECKSUM_PARTIAL) {
 		th->check = ~tcp_v4_check(len, inet->saddr,
@@ -522,7 +522,7 @@ int tcp_v4_gso_send_check(struct sk_buff *skb)
 		return -EINVAL;
 
 	iph = ip_hdr(skb);
-	th = skb->h.th;
+	th = tcp_hdr(skb);
 
 	th->check = 0;
 	th->check = ~tcp_v4_check(skb->len, iph->saddr, iph->daddr, 0);
@@ -546,7 +546,7 @@ int tcp_v4_gso_send_check(struct sk_buff *skb)
 
 static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb)
 {
-	struct tcphdr *th = skb->h.th;
+	struct tcphdr *th = tcp_hdr(skb);
 	struct {
 		struct tcphdr th;
 #ifdef CONFIG_TCP_MD5SIG
@@ -622,7 +622,7 @@ static void tcp_v4_send_ack(struct tcp_timewait_sock *twsk,
 			    struct sk_buff *skb, u32 seq, u32 ack,
 			    u32 win, u32 ts)
 {
-	struct tcphdr *th = skb->h.th;
+	struct tcphdr *th = tcp_hdr(skb);
 	struct {
 		struct tcphdr th;
 		__be32 opt[(TCPOLEN_TSTAMP_ALIGNED >> 2)
@@ -745,7 +745,7 @@ static int tcp_v4_send_synack(struct sock *sk, struct request_sock *req,
 	skb = tcp_make_synack(sk, dst, req);
 
 	if (skb) {
-		struct tcphdr *th = skb->h.th;
+		struct tcphdr *th = tcp_hdr(skb);
 
 		th->check = tcp_v4_check(skb->len,
 					 ireq->loc_addr,
@@ -781,7 +781,7 @@ static void syn_flood_warning(struct sk_buff *skb)
 		warntime = jiffies;
 		printk(KERN_INFO
 		       "possible SYN flooding on port %d. Sending cookies.\n",
-		       ntohs(skb->h.th->dest));
+		       ntohs(tcp_hdr(skb)->dest));
 	}
 }
 #endif
@@ -1134,7 +1134,7 @@ static int tcp_v4_inbound_md5_hash(struct sock *sk, struct sk_buff *skb)
 	__u8 *hash_location = NULL;
 	struct tcp_md5sig_key *hash_expected;
 	const struct iphdr *iph = ip_hdr(skb);
-	struct tcphdr *th = skb->h.th;
+	struct tcphdr *th = tcp_hdr(skb);
 	int length = (th->doff << 2) - sizeof(struct tcphdr);
 	int genhash;
 	unsigned char *ptr;
@@ -1327,7 +1327,7 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
 	ireq->rmt_addr = saddr;
 	ireq->opt = tcp_v4_save_options(sk, skb);
 	if (!want_cookie)
-		TCP_ECN_create_request(req, skb->h.th);
+		TCP_ECN_create_request(req, tcp_hdr(skb));
 
 	if (want_cookie) {
 #ifdef CONFIG_SYN_COOKIES
@@ -1375,7 +1375,7 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
 			LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open "
 				       "request from %u.%u.%u.%u/%u\n",
 				       NIPQUAD(saddr),
-				       ntohs(skb->h.th->source));
+				       ntohs(tcp_hdr(skb)->source));
 			dst_release(dst);
 			goto drop_and_free;
 		}
@@ -1481,7 +1481,7 @@ struct sock *tcp_v4_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
 
 static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb)
 {
-	struct tcphdr *th = skb->h.th;
+	struct tcphdr *th = tcp_hdr(skb);
 	const struct iphdr *iph = ip_hdr(skb);
 	struct sock *nsk;
 	struct request_sock **prev;
@@ -1556,7 +1556,7 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
 
 	if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
 		TCP_CHECK_TIMER(sk);
-		if (tcp_rcv_established(sk, skb, skb->h.th, skb->len)) {
+		if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) {
 			rsk = sk;
 			goto reset;
 		}
@@ -1582,7 +1582,7 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
 	}
 
 	TCP_CHECK_TIMER(sk);
-	if (tcp_rcv_state_process(sk, skb, skb->h.th, skb->len)) {
+	if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) {
 		rsk = sk;
 		goto reset;
 	}
@@ -1625,7 +1625,7 @@ int tcp_v4_rcv(struct sk_buff *skb)
 	if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
 		goto discard_it;
 
-	th = skb->h.th;
+	th = tcp_hdr(skb);
 
 	if (th->doff < sizeof(struct tcphdr) / 4)
 		goto bad_packet;
@@ -1640,7 +1640,7 @@ int tcp_v4_rcv(struct sk_buff *skb)
 	     tcp_v4_checksum_init(skb)))
 		goto bad_packet;
 
-	th = skb->h.th;
+	th = tcp_hdr(skb);
 	iph = ip_hdr(skb);
 	TCP_SKB_CB(skb)->seq = ntohl(th->seq);
 	TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +

net/ipv4/tcp_minisocks.c

@@ -453,7 +453,8 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req,
 			newtp->rx_opt.snd_wscale = newtp->rx_opt.rcv_wscale = 0;
 			newtp->window_clamp = min(newtp->window_clamp, 65535U);
 		}
-		newtp->snd_wnd = ntohs(skb->h.th->window) << newtp->rx_opt.snd_wscale;
+		newtp->snd_wnd = (ntohs(tcp_hdr(skb)->window) <<
+				  newtp->rx_opt.snd_wscale);
 		newtp->max_window = newtp->snd_wnd;
 
 		if (newtp->rx_opt.tstamp_ok) {
@@ -488,7 +489,7 @@ struct sock *tcp_check_req(struct sock *sk,struct sk_buff *skb,
 			   struct request_sock *req,
 			   struct request_sock **prev)
 {
-	struct tcphdr *th = skb->h.th;
+	const struct tcphdr *th = tcp_hdr(skb);
 	__be32 flg = tcp_flag_word(th) & (TCP_FLAG_RST|TCP_FLAG_SYN|TCP_FLAG_ACK);
 	int paws_reject = 0;
 	struct tcp_options_received tmp_opt;
@@ -710,8 +711,8 @@ int tcp_child_process(struct sock *parent, struct sock *child,
 	int state = child->sk_state;
 
 	if (!sock_owned_by_user(child)) {
-		ret = tcp_rcv_state_process(child, skb, skb->h.th, skb->len);
+		ret = tcp_rcv_state_process(child, skb, tcp_hdr(skb),
-
+					    skb->len);
 		/* Wakeup parent, send SIGIO */
 		if (state == TCP_SYN_RECV && child->sk_state != state)
 			parent->sk_data_ready(parent, 0);

net/ipv4/tcp_output.c

@@ -465,11 +465,12 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
 		tcp_header_size += TCPOLEN_MD5SIG_ALIGNED;
 #endif
 
-	th = (struct tcphdr *) skb_push(skb, tcp_header_size);
+	skb_push(skb, tcp_header_size);
-	skb->h.th = th;
+	skb_reset_transport_header(skb);
 	skb_set_owner_w(skb, sk);
 
 	/* Build TCP header and checksum it. */
+	th = tcp_hdr(skb);
 	th->source		= inet->sport;
 	th->dest		= inet->dport;
 	th->seq			= htonl(tcb->seq);
@@ -524,7 +525,7 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
 		tp->af_specific->calc_md5_hash(md5_hash_location,
 					       md5,
 					       sk, NULL, NULL,
-					       skb->h.th,
+					       tcp_hdr(skb),
 					       sk->sk_protocol,
 					       skb->len);
 	}
@@ -2128,8 +2129,10 @@ struct sk_buff * tcp_make_synack(struct sock *sk, struct dst_entry *dst,
 	if (md5)
 		tcp_header_size += TCPOLEN_MD5SIG_ALIGNED;
 #endif
-	skb->h.th = th = (struct tcphdr *) skb_push(skb, tcp_header_size);
+	skb_push(skb, tcp_header_size);
+	skb_reset_transport_header(skb);
 
+	th = tcp_hdr(skb);
 	memset(th, 0, sizeof(struct tcphdr));
 	th->syn = 1;
 	th->ack = 1;
@@ -2183,7 +2186,7 @@ struct sk_buff * tcp_make_synack(struct sock *sk, struct dst_entry *dst,
 		tp->af_specific->calc_md5_hash(md5_hash_location,
 					       md5,
 					       NULL, dst, req,
-					       skb->h.th, sk->sk_protocol,
+					       tcp_hdr(skb), sk->sk_protocol,
 					       skb->len);
 	}
 #endif

net/ipv6/tcp_ipv6.c

@@ -117,8 +117,8 @@ static __u32 tcp_v6_init_sequence(struct sk_buff *skb)
 {
 	return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
 					    ipv6_hdr(skb)->saddr.s6_addr32,
-					    skb->h.th->dest,
+					    tcp_hdr(skb)->dest,
-					    skb->h.th->source);
+					    tcp_hdr(skb)->source);
 }
 
 static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
@@ -509,7 +509,7 @@ static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req,
 
 	skb = tcp_make_synack(sk, dst, req);
 	if (skb) {
-		struct tcphdr *th = skb->h.th;
+		struct tcphdr *th = tcp_hdr(skb);
 
 		th->check = tcp_v6_check(th, skb->len,
 					 &treq->loc_addr, &treq->rmt_addr,
@@ -838,7 +838,7 @@ static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb)
 	__u8 *hash_location = NULL;
 	struct tcp_md5sig_key *hash_expected;
 	struct ipv6hdr *ip6h = ipv6_hdr(skb);
-	struct tcphdr *th = skb->h.th;
+	struct tcphdr *th = tcp_hdr(skb);
 	int length = (th->doff << 2) - sizeof (*th);
 	int genhash;
 	u8 *ptr;
@@ -946,7 +946,7 @@ static struct timewait_sock_ops tcp6_timewait_sock_ops = {
 static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
 {
 	struct ipv6_pinfo *np = inet6_sk(sk);
-	struct tcphdr *th = skb->h.th;
+	struct tcphdr *th = tcp_hdr(skb);
 
 	if (skb->ip_summed == CHECKSUM_PARTIAL) {
 		th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP,  0);
@@ -967,7 +967,7 @@ static int tcp_v6_gso_send_check(struct sk_buff *skb)
 		return -EINVAL;
 
 	ipv6h = ipv6_hdr(skb);
-	th = skb->h.th;
+	th = tcp_hdr(skb);
 
 	th->check = 0;
 	th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
@@ -979,7 +979,7 @@ static int tcp_v6_gso_send_check(struct sk_buff *skb)
 
 static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
 {
-	struct tcphdr *th = skb->h.th, *t1;
+	struct tcphdr *th = tcp_hdr(skb), *t1;
 	struct sk_buff *buff;
 	struct flowi fl;
 	int tot_len = sizeof(*th);
@@ -1079,7 +1079,7 @@ static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
 static void tcp_v6_send_ack(struct tcp_timewait_sock *tw,
 			    struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts)
 {
-	struct tcphdr *th = skb->h.th, *t1;
+	struct tcphdr *th = tcp_hdr(skb), *t1;
 	struct sk_buff *buff;
 	struct flowi fl;
 	int tot_len = sizeof(struct tcphdr);
@@ -1195,7 +1195,7 @@ static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req)
 static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
 {
 	struct request_sock *req, **prev;
-	const struct tcphdr *th = skb->h.th;
+	const struct tcphdr *th = tcp_hdr(skb);
 	struct sock *nsk;
 
 	/* Find possible connection requests. */
@@ -1275,7 +1275,7 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 	treq = inet6_rsk(req);
 	ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr);
 	ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr);
-	TCP_ECN_create_request(req, skb->h.th);
+	TCP_ECN_create_request(req, tcp_hdr(skb));
 	treq->pktopts = NULL;
 	if (ipv6_opt_accepted(sk, skb) ||
 	    np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
@@ -1528,14 +1528,14 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
 static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
 {
 	if (skb->ip_summed == CHECKSUM_COMPLETE) {
-		if (!tcp_v6_check(skb->h.th, skb->len, &ipv6_hdr(skb)->saddr,
+		if (!tcp_v6_check(tcp_hdr(skb), skb->len, &ipv6_hdr(skb)->saddr,
 				  &ipv6_hdr(skb)->daddr, skb->csum)) {
 			skb->ip_summed = CHECKSUM_UNNECESSARY;
 			return 0;
 		}
 	}
 
-	skb->csum = ~csum_unfold(tcp_v6_check(skb->h.th, skb->len,
+	skb->csum = ~csum_unfold(tcp_v6_check(tcp_hdr(skb), skb->len,
 					      &ipv6_hdr(skb)->saddr,
 					      &ipv6_hdr(skb)->daddr, 0));
 
@@ -1601,7 +1601,7 @@ static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 
 	if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
 		TCP_CHECK_TIMER(sk);
-		if (tcp_rcv_established(sk, skb, skb->h.th, skb->len))
+		if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len))
 			goto reset;
 		TCP_CHECK_TIMER(sk);
 		if (opt_skb)
@@ -1632,7 +1632,7 @@ static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 	}
 
 	TCP_CHECK_TIMER(sk);
-	if (tcp_rcv_state_process(sk, skb, skb->h.th, skb->len))
+	if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
 		goto reset;
 	TCP_CHECK_TIMER(sk);
 	if (opt_skb)
@@ -1698,7 +1698,7 @@ static int tcp_v6_rcv(struct sk_buff **pskb)
 	if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
 		goto discard_it;
 
-	th = skb->h.th;
+	th = tcp_hdr(skb);
 
 	if (th->doff < sizeof(struct tcphdr)/4)
 		goto bad_packet;
@@ -1709,7 +1709,7 @@ static int tcp_v6_rcv(struct sk_buff **pskb)
 	     tcp_v6_checksum_init(skb)))
 		goto bad_packet;
 
-	th = skb->h.th;
+	th = tcp_hdr(skb);
 	TCP_SKB_CB(skb)->seq = ntohl(th->seq);
 	TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
 				    skb->len - th->doff*4);