[SK_BUFF]: Introduce ip_hdr(), remove skb->nh.iph

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

drivers/ieee1394/eth1394.c

@@ -1668,7 +1668,7 @@ static int ether1394_tx (struct sk_buff *skb, struct net_device *dev)
 	if (memcmp(eth->h_dest, dev->broadcast, ETH1394_ALEN) == 0 ||
 	    proto == htons(ETH_P_ARP) ||
 	    (proto == htons(ETH_P_IP) &&
-	     IN_MULTICAST(ntohl(skb->nh.iph->daddr)))) {
+	     IN_MULTICAST(ntohl(ip_hdr(skb)->daddr)))) {
 		tx_type = ETH1394_GASP;
 		dest_node = LOCAL_BUS | ALL_NODES;
 		max_payload = priv->bc_maxpayload - ETHER1394_GASP_OVERHEAD;

drivers/net/8139cp.c

@@ -806,7 +806,7 @@ static int cp_start_xmit (struct sk_buff *skb, struct net_device *dev)
 		if (mss)
 			flags |= LargeSend | ((mss & MSSMask) << MSSShift);
 		else if (skb->ip_summed == CHECKSUM_PARTIAL) {
-			const struct iphdr *ip = skb->nh.iph;
+			const struct iphdr *ip = ip_hdr(skb);
 			if (ip->protocol == IPPROTO_TCP)
 				flags |= IPCS | TCPCS;
 			else if (ip->protocol == IPPROTO_UDP)
@@ -825,7 +825,7 @@ static int cp_start_xmit (struct sk_buff *skb, struct net_device *dev)
 		u32 first_len, first_eor;
 		dma_addr_t first_mapping;
 		int frag, first_entry = entry;
-		const struct iphdr *ip = skb->nh.iph;
+		const struct iphdr *ip = ip_hdr(skb);
 
 		/* We must give this initial chunk to the device last.
 		 * Otherwise we could race with the device.

drivers/net/atl1/atl1_main.c

@@ -1294,17 +1294,18 @@ static int atl1_tso(struct atl1_adapter *adapter, struct sk_buff *skb,
 		}
 
 		if (skb->protocol == ntohs(ETH_P_IP)) {
-			skb->nh.iph->tot_len = 0;
+			struct iphdr *iph = ip_hdr(skb);
-			skb->nh.iph->check = 0;
+
-			skb->h.th->check =
+			iph->tot_len = 0;
-			    ~csum_tcpudp_magic(skb->nh.iph->saddr,
+			iph->check = 0;
-					       skb->nh.iph->daddr, 0,
+			skb->h.th->check = ~csum_tcpudp_magic(iph->saddr,
-					       IPPROTO_TCP, 0);
+							      iph->daddr, 0,
+							      IPPROTO_TCP, 0);
 			ipofst = skb_network_offset(skb);
 			if (ipofst != ENET_HEADER_SIZE) /* 802.3 frame */
 				tso->tsopl |= 1 << TSO_PARAM_ETHTYPE_SHIFT;
 
-			tso->tsopl |= (skb->nh.iph->ihl &
+			tso->tsopl |= (iph->ihl &
 				CSUM_PARAM_IPHL_MASK) << CSUM_PARAM_IPHL_SHIFT;
 			tso->tsopl |= ((skb->h.th->doff << 2) &
 				TSO_PARAM_TCPHDRLEN_MASK) << TSO_PARAM_TCPHDRLEN_SHIFT;

drivers/net/bnx2.c

@@ -4513,6 +4513,7 @@ bnx2_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	if ((mss = skb_shinfo(skb)->gso_size) &&
 		(skb->len > (bp->dev->mtu + ETH_HLEN))) {
 		u32 tcp_opt_len, ip_tcp_len;
+		struct iphdr *iph;
 
 		if (skb_header_cloned(skb) &&
 		    pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) {
@@ -4529,16 +4530,15 @@ bnx2_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		}
 		ip_tcp_len = ip_hdrlen(skb) + sizeof(struct tcphdr);
 
-		skb->nh.iph->check = 0;
+		iph = ip_hdr(skb);
-		skb->nh.iph->tot_len = htons(mss + ip_tcp_len + tcp_opt_len);
+		iph->check = 0;
-		skb->h.th->check =
+		iph->tot_len = htons(mss + ip_tcp_len + tcp_opt_len);
-			~csum_tcpudp_magic(skb->nh.iph->saddr,
+		skb->h.th->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
-					    skb->nh.iph->daddr,
+						      0, IPPROTO_TCP, 0);
-					    0, IPPROTO_TCP, 0);
 
-		if (tcp_opt_len || (skb->nh.iph->ihl > 5)) {
+		if (tcp_opt_len || (iph->ihl > 5)) {
-			vlan_tag_flags |= ((skb->nh.iph->ihl - 5) +
+			vlan_tag_flags |= ((iph->ihl - 5) +
-				(tcp_opt_len >> 2)) << 8;
+					   (tcp_opt_len >> 2)) << 8;
 		}
 	}
 	else

drivers/net/bonding/bond_alb.c

@@ -112,7 +112,7 @@ static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb)
 /* Forward declaration */
 static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]);
 
-static inline u8 _simple_hash(u8 *hash_start, int hash_size)
+static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
 {
 	int i;
 	u8 hash = 0;
@@ -1268,7 +1268,7 @@ int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
 	int hash_size = 0;
 	int do_tx_balance = 1;
 	u32 hash_index = 0;
-	u8 *hash_start = NULL;
+	const u8 *hash_start = NULL;
 	int res = 1;
 
 	skb_reset_mac_header(skb);
@@ -1285,15 +1285,18 @@ int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
 	}
 
 	switch (ntohs(skb->protocol)) {
-	case ETH_P_IP:
+	case ETH_P_IP: {
+		const struct iphdr *iph = ip_hdr(skb);
+
 		if ((memcmp(eth_data->h_dest, mac_bcast, ETH_ALEN) == 0) ||
-		    (skb->nh.iph->daddr == ip_bcast) ||
+		    (iph->daddr == ip_bcast) ||
-		    (skb->nh.iph->protocol == IPPROTO_IGMP)) {
+		    (iph->protocol == IPPROTO_IGMP)) {
 			do_tx_balance = 0;
 			break;
 		}
-		hash_start = (char*)&(skb->nh.iph->daddr);
+		hash_start = (char *)&(iph->daddr);
-		hash_size = sizeof(skb->nh.iph->daddr);
+		hash_size = sizeof(iph->daddr);
+	}
 		break;
 	case ETH_P_IPV6:
 		if (memcmp(eth_data->h_dest, mac_bcast, ETH_ALEN) == 0) {

drivers/net/bonding/bond_main.c

@@ -3476,7 +3476,7 @@ static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
 				    struct net_device *bond_dev, int count)
 {
 	struct ethhdr *data = (struct ethhdr *)skb->data;
-	struct iphdr *iph = skb->nh.iph;
+	struct iphdr *iph = ip_hdr(skb);
 	u16 *layer4hdr = (u16 *)((u32 *)iph + iph->ihl);
 	int layer4_xor = 0;
 

drivers/net/chelsio/sge.c

@@ -1871,7 +1871,7 @@ int t1_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		hdr = (struct cpl_tx_pkt_lso *)skb_push(skb, sizeof(*hdr));
 		hdr->opcode = CPL_TX_PKT_LSO;
 		hdr->ip_csum_dis = hdr->l4_csum_dis = 0;
-		hdr->ip_hdr_words = skb->nh.iph->ihl;
+		hdr->ip_hdr_words = ip_hdr(skb)->ihl;
 		hdr->tcp_hdr_words = skb->h.th->doff;
 		hdr->eth_type_mss = htons(MK_ETH_TYPE_MSS(eth_type,
 							  skb_shinfo(skb)->gso_size));
@@ -1912,7 +1912,7 @@ int t1_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
 		if (!(adapter->flags & UDP_CSUM_CAPABLE) &&
 		    skb->ip_summed == CHECKSUM_PARTIAL &&
-		    skb->nh.iph->protocol == IPPROTO_UDP) {
+		    ip_hdr(skb)->protocol == IPPROTO_UDP) {
 			if (unlikely(skb_checksum_help(skb))) {
 				pr_debug("%s: unable to do udp checksum\n", dev->name);
 				dev_kfree_skb_any(skb);

drivers/net/cxgb3/sge.c

@@ -900,7 +900,7 @@ static void write_tx_pkt_wr(struct adapter *adap, struct sk_buff *skb,
 		eth_type = skb_network_offset(skb) == ETH_HLEN ?
 		    CPL_ETH_II : CPL_ETH_II_VLAN;
 		tso_info |= V_LSO_ETH_TYPE(eth_type) |
-		    V_LSO_IPHDR_WORDS(skb->nh.iph->ihl) |
+		    V_LSO_IPHDR_WORDS(ip_hdr(skb)->ihl) |
 		    V_LSO_TCPHDR_WORDS(skb->h.th->doff);
 		hdr->lso_info = htonl(tso_info);
 		flits = 3;

drivers/net/e1000/e1000_main.c

@@ -2890,14 +2890,12 @@ e1000_tso(struct e1000_adapter *adapter, struct e1000_tx_ring *tx_ring,
 		hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
 		mss = skb_shinfo(skb)->gso_size;
 		if (skb->protocol == htons(ETH_P_IP)) {
-			skb->nh.iph->tot_len = 0;
+			struct iphdr *iph = ip_hdr(skb);
-			skb->nh.iph->check = 0;
+			iph->tot_len = 0;
-			skb->h.th->check =
+			iph->check = 0;
-				~csum_tcpudp_magic(skb->nh.iph->saddr,
+			skb->h.th->check = ~csum_tcpudp_magic(iph->saddr,
-						   skb->nh.iph->daddr,
+							      iph->daddr, 0,
-						   0,
+							      IPPROTO_TCP, 0);
-						   IPPROTO_TCP,
-						   0);
 			cmd_length = E1000_TXD_CMD_IP;
 			ipcse = skb->h.raw - skb->data - 1;
 		} else if (skb->protocol == htons(ETH_P_IPV6)) {
@@ -2911,7 +2909,7 @@ e1000_tso(struct e1000_adapter *adapter, struct e1000_tx_ring *tx_ring,
 			ipcse = 0;
 		}
 		ipcss = skb_network_offset(skb);
-		ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
+		ipcso = (void *)&(ip_hdr(skb)->check) - (void *)skb->data;
 		tucss = skb->h.raw - skb->data;
 		tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
 		tucse = 0;

drivers/net/ehea/ehea_main.c

@@ -1262,7 +1262,7 @@ static int ehea_clean_portres(struct ehea_port *port, struct ehea_port_res *pr)
 static inline void write_ip_start_end(struct ehea_swqe *swqe,
 				      const struct sk_buff *skb)
 {
-	swqe->ip_start = (u8)(((u64)skb->nh.iph) - ((u64)skb->data));
+	swqe->ip_start = skb_network_offset(skb);
 	swqe->ip_end = (u8)(swqe->ip_start + ip_hdrlen(skb) - 1);
 }
 
@@ -1688,6 +1688,7 @@ static void ehea_xmit2(struct sk_buff *skb, struct net_device *dev,
 		       struct ehea_swqe *swqe, u32 lkey)
 {
 	if (skb->protocol == htons(ETH_P_IP)) {
+		const struct iphdr *iph = ip_hdr(skb);
 		/* IPv4 */
 		swqe->tx_control |= EHEA_SWQE_CRC
 				 | EHEA_SWQE_IP_CHECKSUM
@@ -1697,15 +1698,15 @@ static void ehea_xmit2(struct sk_buff *skb, struct net_device *dev,
 
 		write_ip_start_end(swqe, skb);
 
-		if (skb->nh.iph->protocol == IPPROTO_UDP) {
+		if (iph->protocol == IPPROTO_UDP) {
-			if ((skb->nh.iph->frag_off & IP_MF) ||
+			if ((iph->frag_off & IP_MF) ||
-			    (skb->nh.iph->frag_off & IP_OFFSET))
+			    (iph->frag_off & IP_OFFSET))
 				/* IP fragment, so don't change cs */
 				swqe->tx_control &= ~EHEA_SWQE_TCP_CHECKSUM;
 			else
 				write_udp_offset_end(swqe, skb);
 
-		} else if (skb->nh.iph->protocol == IPPROTO_TCP) {
+		} else if (iph->protocol == IPPROTO_TCP) {
 			write_tcp_offset_end(swqe, skb);
 		}
 
@@ -1731,10 +1732,11 @@ static void ehea_xmit3(struct sk_buff *skb, struct net_device *dev,
 	int i;
 
 	if (skb->protocol == htons(ETH_P_IP)) {
+		const struct iphdr *iph = ip_hdr(skb);
 		/* IPv4 */
 		write_ip_start_end(swqe, skb);
 
-		if (skb->nh.iph->protocol == IPPROTO_TCP) {
+		if (iph->protocol == IPPROTO_TCP) {
 			swqe->tx_control |= EHEA_SWQE_CRC
 					 | EHEA_SWQE_IP_CHECKSUM
 					 | EHEA_SWQE_TCP_CHECKSUM
@@ -1742,9 +1744,9 @@ static void ehea_xmit3(struct sk_buff *skb, struct net_device *dev,
 
 			write_tcp_offset_end(swqe, skb);
 
-		} else if (skb->nh.iph->protocol == IPPROTO_UDP) {
+		} else if (iph->protocol == IPPROTO_UDP) {
-			if ((skb->nh.iph->frag_off & IP_MF) ||
+			if ((iph->frag_off & IP_MF) ||
-			    (skb->nh.iph->frag_off & IP_OFFSET))
+			    (iph->frag_off & IP_OFFSET))
 				/* IP fragment, so don't change cs */
 				swqe->tx_control |= EHEA_SWQE_CRC
 						 | EHEA_SWQE_IMM_DATA_PRESENT;

drivers/net/gianfar.c

@@ -942,7 +942,7 @@ static inline void gfar_tx_checksum(struct sk_buff *skb, struct txfcb *fcb)
 
 	/* Tell the controller what the protocol is */
 	/* And provide the already calculated phcs */
-	if (skb->nh.iph->protocol == IPPROTO_UDP) {
+	if (ip_hdr(skb)->protocol == IPPROTO_UDP) {
 		flags |= TXFCB_UDP;
 		fcb->phcs = skb->h.uh->check;
 	} else

drivers/net/ioc3-eth.c

@@ -1393,9 +1393,9 @@ static int ioc3_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	 * manually.
 	 */
 	if (skb->ip_summed == CHECKSUM_PARTIAL) {
-		int proto = ntohs(skb->nh.iph->protocol);
+		const struct iphdr *ih = ip_hdr(skb);
+		const int proto = ntohs(ih->protocol);
 		unsigned int csoff;
-		struct iphdr *ih = skb->nh.iph;
 		uint32_t csum, ehsum;
 		uint16_t *eh;
 

drivers/net/ixgb/ixgb_main.c

@@ -1182,6 +1182,8 @@ ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
 
 	if (likely(skb_is_gso(skb))) {
 		struct ixgb_buffer *buffer_info;
+		struct iphdr *iph;
+
 		if (skb_header_cloned(skb)) {
 			err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
 			if (err)
@@ -1190,13 +1192,13 @@ ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
 
 		hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
 		mss = skb_shinfo(skb)->gso_size;
-		skb->nh.iph->tot_len = 0;
+		iph = ip_hdr(skb);
-		skb->nh.iph->check = 0;
+		iph->tot_len = 0;
-		skb->h.th->check = ~csum_tcpudp_magic(skb->nh.iph->saddr,
+		iph->check = 0;
-						      skb->nh.iph->daddr,
+		skb->h.th->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
 						      0, IPPROTO_TCP, 0);
 		ipcss = skb_network_offset(skb);
-		ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
+		ipcso = (void *)&(iph->check) - (void *)skb->data;
 		ipcse = skb->h.raw - skb->data - 1;
 		tucss = skb->h.raw - skb->data;
 		tucso = (void *)&(skb->h.th->check) - (void *)skb->data;

drivers/net/loopback.c

@@ -75,7 +75,7 @@ static DEFINE_PER_CPU(struct pcpu_lstats, pcpu_lstats);
 #ifdef LOOPBACK_TSO
 static void emulate_large_send_offload(struct sk_buff *skb)
 {
-	struct iphdr *iph = skb->nh.iph;
+	struct iphdr *iph = ip_hdr(skb);
 	struct tcphdr *th = (struct tcphdr *)(skb_network_header(skb) +
 					      (iph->ihl * 4));
 	unsigned int doffset = (iph->ihl + th->doff) * 4;
@@ -93,7 +93,7 @@ static void emulate_large_send_offload(struct sk_buff *skb)
 		skb_reserve(nskb, 32);
 		skb_set_mac_header(nskb, -ETH_HLEN);
 		skb_reset_network_header(nskb);
-		iph = nskb->nh.iph;
+		iph = ip_hdr(nskb);
 		memcpy(nskb->data, skb_network_header(skb), doffset);
 		if (skb_copy_bits(skb,
 				  doffset + offset,
@@ -145,7 +145,7 @@ static int loopback_xmit(struct sk_buff *skb, struct net_device *dev)
 #ifdef LOOPBACK_TSO
 	if (skb_is_gso(skb)) {
 		BUG_ON(skb->protocol != htons(ETH_P_IP));
-		BUG_ON(skb->nh.iph->protocol != IPPROTO_TCP);
+		BUG_ON(ip_hdr(skb)->protocol != IPPROTO_TCP);
 
 		emulate_large_send_offload(skb);
 		return 0;

drivers/net/mv643xx_eth.c

@@ -1161,9 +1161,9 @@ static void eth_tx_submit_descs_for_skb(struct mv643xx_private *mp,
 
 		cmd_sts |= ETH_GEN_TCP_UDP_CHECKSUM |
 			   ETH_GEN_IP_V_4_CHECKSUM  |
-			   skb->nh.iph->ihl << ETH_TX_IHL_SHIFT;
+			   ip_hdr(skb)->ihl << ETH_TX_IHL_SHIFT;
 
-		switch (skb->nh.iph->protocol) {
+		switch (ip_hdr(skb)->protocol) {
 		case IPPROTO_UDP:
 			cmd_sts |= ETH_UDP_FRAME;
 			desc->l4i_chk = skb->h.uh->check;

drivers/net/netxen/netxen_nic_hw.c

@@ -378,9 +378,9 @@ void netxen_tso_check(struct netxen_adapter *adapter,
 					  skb->h.th->doff * 4);
 		netxen_set_cmd_desc_opcode(desc, TX_TCP_LSO);
 	} else if (skb->ip_summed == CHECKSUM_PARTIAL) {
-		if (skb->nh.iph->protocol == IPPROTO_TCP) {
+		if (ip_hdr(skb)->protocol == IPPROTO_TCP) {
 			netxen_set_cmd_desc_opcode(desc, TX_TCP_PKT);
-		} else if (skb->nh.iph->protocol == IPPROTO_UDP) {
+		} else if (ip_hdr(skb)->protocol == IPPROTO_UDP) {
 			netxen_set_cmd_desc_opcode(desc, TX_UDP_PKT);
 		} else {
 			return;

drivers/net/ns83820.c

@@ -1156,9 +1156,9 @@ again:
 	extsts = 0;
 	if (skb->ip_summed == CHECKSUM_PARTIAL) {
 		extsts |= EXTSTS_IPPKT;
-		if (IPPROTO_TCP == skb->nh.iph->protocol)
+		if (IPPROTO_TCP == ip_hdr(skb)->protocol)
 			extsts |= EXTSTS_TCPPKT;
-		else if (IPPROTO_UDP == skb->nh.iph->protocol)
+		else if (IPPROTO_UDP == ip_hdr(skb)->protocol)
 			extsts |= EXTSTS_UDPPKT;
 	}
 

drivers/net/pasemi_mac.c

@@ -731,7 +731,7 @@ static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
 	if (skb->ip_summed == CHECKSUM_PARTIAL) {
 		const unsigned char *nh = skb_network_header(skb);
 
-		switch (skb->nh.iph->protocol) {
+		switch (ip_hdr(skb)->protocol) {
 		case IPPROTO_TCP:
 			dflags |= XCT_MACTX_CSUM_TCP;
 			dflags |= XCT_MACTX_IPH((skb->h.raw - skb->nh.raw) >> 2);

drivers/net/r8169.c

@@ -2284,7 +2284,7 @@ static inline u32 rtl8169_tso_csum(struct sk_buff *skb, struct net_device *dev)
 			return LargeSend | ((mss & MSSMask) << MSSShift);
 	}
 	if (skb->ip_summed == CHECKSUM_PARTIAL) {
-		const struct iphdr *ip = skb->nh.iph;
+		const struct iphdr *ip = ip_hdr(skb);
 
 		if (ip->protocol == IPPROTO_TCP)
 			return IPCS | TCPCS;

drivers/net/sky2.c

@@ -1428,7 +1428,7 @@ static int sky2_xmit_frame(struct sk_buff *skb, struct net_device *dev)
 		tcpsum |= offset + skb->csum_offset;	/* sum write */
 
 		ctrl = CALSUM | WR_SUM | INIT_SUM | LOCK_SUM;
-		if (skb->nh.iph->protocol == IPPROTO_UDP)
+		if (ip_hdr(skb)->protocol == IPPROTO_UDP)
 			ctrl |= UDPTCP;
 
 		if (tcpsum != sky2->tx_tcpsum) {

drivers/net/spider_net.c

@@ -720,7 +720,7 @@ spider_net_prepare_tx_descr(struct spider_net_card *card,
 	spin_unlock_irqrestore(&chain->lock, flags);
 
 	if (skb->protocol == htons(ETH_P_IP) && skb->ip_summed == CHECKSUM_PARTIAL)
-		switch (skb->nh.iph->protocol) {
+		switch (ip_hdr(skb)->protocol) {
 		case IPPROTO_TCP:
 			hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_TCP;
 			break;

drivers/net/tg3.c

@@ -3909,12 +3909,13 @@ static int tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
 			mss |= (skb_headlen(skb) - ETH_HLEN) << 9;
 		else {
+			struct iphdr *iph = ip_hdr(skb);
+
 			tcp_opt_len = ((skb->h.th->doff - 5) * 4);
 			ip_tcp_len = ip_hdrlen(skb) + sizeof(struct tcphdr);
 
-			skb->nh.iph->check = 0;
+			iph->check = 0;
-			skb->nh.iph->tot_len = htons(mss + ip_tcp_len +
+			iph->tot_len = htons(mss + ip_tcp_len + tcp_opt_len);
-						     tcp_opt_len);
 			mss |= (ip_tcp_len + tcp_opt_len) << 9;
 		}
 
@@ -4055,6 +4056,7 @@ static int tg3_start_xmit_dma_bug(struct sk_buff *skb, struct net_device *dev)
 	mss = 0;
 	if (skb->len > (tp->dev->mtu + ETH_HLEN) &&
 	    (mss = skb_shinfo(skb)->gso_size) != 0) {
+		struct iphdr *iph;
 		int tcp_opt_len, ip_tcp_len, hdr_len;
 
 		if (skb_header_cloned(skb) &&
@@ -4074,34 +4076,32 @@ static int tg3_start_xmit_dma_bug(struct sk_buff *skb, struct net_device *dev)
 		base_flags |= (TXD_FLAG_CPU_PRE_DMA |
 			       TXD_FLAG_CPU_POST_DMA);
 
-		skb->nh.iph->check = 0;
+		iph = ip_hdr(skb);
-		skb->nh.iph->tot_len = htons(mss + hdr_len);
+		iph->check = 0;
+		iph->tot_len = htons(mss + hdr_len);
 		if (tp->tg3_flags2 & TG3_FLG2_HW_TSO) {
 			skb->h.th->check = 0;
 			base_flags &= ~TXD_FLAG_TCPUDP_CSUM;
 		}
 		else {
-			skb->h.th->check =
+			skb->h.th->check = ~csum_tcpudp_magic(iph->saddr,
-				~csum_tcpudp_magic(skb->nh.iph->saddr,
+							      iph->daddr, 0,
-						   skb->nh.iph->daddr,
+							      IPPROTO_TCP, 0);
-						   0, IPPROTO_TCP, 0);
 		}
 
 		if ((tp->tg3_flags2 & TG3_FLG2_HW_TSO) ||
 		    (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5705)) {
-			if (tcp_opt_len || skb->nh.iph->ihl > 5) {
+			if (tcp_opt_len || iph->ihl > 5) {
 				int tsflags;
 
-				tsflags = ((skb->nh.iph->ihl - 5) +
+				tsflags = (iph->ihl - 5) + (tcp_opt_len >> 2);
-					   (tcp_opt_len >> 2));
 				mss |= (tsflags << 11);
 			}
 		} else {
-			if (tcp_opt_len || skb->nh.iph->ihl > 5) {
+			if (tcp_opt_len || iph->ihl > 5) {
 				int tsflags;
 
-				tsflags = ((skb->nh.iph->ihl - 5) +
+				tsflags = (iph->ihl - 5) + (tcp_opt_len >> 2);
-					   (tcp_opt_len >> 2));
 				base_flags |= tsflags << 12;
 			}
 		}

drivers/net/via-velocity.c

@@ -2006,7 +2006,7 @@ static int velocity_xmit(struct sk_buff *skb, struct net_device *dev)
 	 */
 	if ((vptr->flags & VELOCITY_FLAGS_TX_CSUM)
 				 && (skb->ip_summed == CHECKSUM_PARTIAL)) {
-		struct iphdr *ip = skb->nh.iph;
+		const struct iphdr *ip = ip_hdr(skb);
 		if (ip->protocol == IPPROTO_TCP)
 			td_ptr->tdesc1.TCR |= TCR0_TCPCK;
 		else if (ip->protocol == IPPROTO_UDP)

drivers/s390/net/qeth_main.c

@@ -3820,18 +3820,20 @@ qeth_get_priority_queue(struct qeth_card *card, struct sk_buff *skb,
 			return card->info.is_multicast_different &
 				(card->qdio.no_out_queues - 1);
 		if (card->qdio.do_prio_queueing && (ipv == 4)) {
+			const u8 tos = ip_hdr(skb)->tos;
+
 			if (card->qdio.do_prio_queueing==QETH_PRIO_Q_ING_TOS){
-				if (skb->nh.iph->tos & IP_TOS_NOTIMPORTANT)
+				if (tos & IP_TOS_NOTIMPORTANT)
 					return 3;
-				if (skb->nh.iph->tos & IP_TOS_HIGHRELIABILITY)
+				if (tos & IP_TOS_HIGHRELIABILITY)
 					return 2;
-				if (skb->nh.iph->tos & IP_TOS_HIGHTHROUGHPUT)
+				if (tos & IP_TOS_HIGHTHROUGHPUT)
 					return 1;
-				if (skb->nh.iph->tos & IP_TOS_LOWDELAY)
+				if (tos & IP_TOS_LOWDELAY)
 					return 0;
 			}
 			if (card->qdio.do_prio_queueing==QETH_PRIO_Q_ING_PREC)
-				return 3 - (skb->nh.iph->tos >> 6);
+				return 3 - (tos >> 6);
 		} else if (card->qdio.do_prio_queueing && (ipv == 6)) {
 			/* TODO: IPv6!!! */
 		}
@@ -4041,7 +4043,8 @@ qeth_fill_header(struct qeth_card *card, struct qeth_hdr *hdr,
 			    *((u32 *) skb->dst->neighbour->primary_key);
 		} else {
 			/* fill in destination address used in ip header */
-			*((u32 *) (&hdr->hdr.l3.dest_addr[12])) = skb->nh.iph->daddr;
+			*((u32 *)(&hdr->hdr.l3.dest_addr[12])) =
+							   ip_hdr(skb)->daddr;
 		}
 	} else if (ipv == 6) { /* IPv6 or passthru */
 		hdr->hdr.l3.flags = qeth_get_qeth_hdr_flags6(cast_type);

drivers/s390/net/qeth_tso.h

@@ -40,7 +40,7 @@ qeth_tso_fill_header(struct qeth_card *card, struct sk_buff *skb)
 	QETH_DBF_TEXT(trace, 5, "tsofhdr");
 
 	hdr  = (struct qeth_hdr_tso *) skb->data;
-	iph  = skb->nh.iph;
+	iph  = ip_hdr(skb);
 	tcph = skb->h.th;
 	/*fix header to TSO values ...*/
 	hdr->hdr.hdr.l3.id = QETH_HEADER_TYPE_TSO;
@@ -63,13 +63,9 @@ qeth_tso_fill_header(struct qeth_card *card, struct sk_buff *skb)
 static inline void
 qeth_tso_set_tcpip_header(struct qeth_card *card, struct sk_buff *skb)
 {
-	struct iphdr *iph;
+	struct iphdr *iph    = ip_hdr(skb);
-	struct ipv6hdr *ip6h;
+	struct ipv6hdr *ip6h = skb->nh.ipv6h;
-	struct tcphdr *tcph;
+	struct tcphdr *tcph  = skb->h.th;
-
-	iph  = skb->nh.iph;
-	ip6h = skb->nh.ipv6h;
-	tcph = skb->h.th;
 
 	tcph->check = 0;
 	if (skb->protocol == ETH_P_IPV6) {

include/linux/ip.h

@@ -104,6 +104,15 @@ struct iphdr {
 	/*The options start here. */
 };
 
+#ifdef __KERNEL__
+#include <linux/skbuff.h>
+
+static inline struct iphdr *ip_hdr(const struct sk_buff *skb)
+{
+	return (struct iphdr *)skb_network_header(skb);
+}
+#endif
+
 struct ip_auth_hdr {
 	__u8  nexthdr;
 	__u8  hdrlen;		/* This one is measured in 32 bit units! */

include/linux/skbuff.h

@@ -247,7 +247,6 @@ struct sk_buff {
 	} h;
 
 	union {
-		struct iphdr	*iph;
 		struct ipv6hdr	*ipv6h;
 		struct arphdr	*arph;
 		unsigned char	*raw;

include/net/inet_ecn.h

@@ -116,7 +116,7 @@ static inline int INET_ECN_set_ce(struct sk_buff *skb)
 	case __constant_htons(ETH_P_IP):
 		if (skb_network_header(skb) + sizeof(struct iphdr) <=
 		    skb->tail)
-			return IP_ECN_set_ce(skb->nh.iph);
+			return IP_ECN_set_ce(ip_hdr(skb));
 		break;
 
 	case __constant_htons(ETH_P_IPV6):

include/net/ip.h

@@ -46,7 +46,7 @@ struct inet_skb_parm
 
 static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
 {
-	return skb->nh.iph->ihl * 4;
+	return ip_hdr(skb)->ihl * 4;
 }
 
 struct ipcm_cookie

include/net/pkt_cls.h

@@ -334,8 +334,8 @@ static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer)
 	return NULL;
 }
 
-static inline int tcf_valid_offset(struct sk_buff *skb, unsigned char *ptr,
+static inline int tcf_valid_offset(const struct sk_buff *skb,
-				   int len)
+				   const unsigned char *ptr, const int len)
 {
 	return unlikely((ptr + len) < skb->tail && ptr > skb->head);
 }

net/atm/mpc.c

@@ -715,7 +715,7 @@ static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
 	new_skb->protocol = eth_type_trans(new_skb, dev);
 	skb_reset_network_header(new_skb);
 
-	eg->latest_ip_addr = new_skb->nh.iph->saddr;
+	eg->latest_ip_addr = ip_hdr(new_skb)->saddr;
 	eg->packets_rcvd++;
 	mpc->eg_ops->put(eg);
 

net/bridge/br_netfilter.c

@@ -48,8 +48,8 @@
 
 #define skb_origaddr(skb)	 (((struct bridge_skb_cb *) \
 				 (skb->nf_bridge->data))->daddr.ipv4)
-#define store_orig_dstaddr(skb)	 (skb_origaddr(skb) = (skb)->nh.iph->daddr)
+#define store_orig_dstaddr(skb)	 (skb_origaddr(skb) = ip_hdr(skb)->daddr)
-#define dnat_took_place(skb)	 (skb_origaddr(skb) != (skb)->nh.iph->daddr)
+#define dnat_took_place(skb)	 (skb_origaddr(skb) != ip_hdr(skb)->daddr)
 
 #ifdef CONFIG_SYSCTL
 static struct ctl_table_header *brnf_sysctl_header;
@@ -265,7 +265,7 @@ static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb)
 static int br_nf_pre_routing_finish(struct sk_buff *skb)
 {
 	struct net_device *dev = skb->dev;
-	struct iphdr *iph = skb->nh.iph;
+	struct iphdr *iph = ip_hdr(skb);
 	struct nf_bridge_info *nf_bridge = skb->nf_bridge;
 	int err;
 
@@ -520,14 +520,14 @@ static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb,
 	if (!pskb_may_pull(skb, sizeof(struct iphdr)))
 		goto inhdr_error;
 
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 	if (iph->ihl < 5 || iph->version != 4)
 		goto inhdr_error;
 
 	if (!pskb_may_pull(skb, 4 * iph->ihl))
 		goto inhdr_error;
 
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 	if (ip_fast_csum((__u8 *) iph, iph->ihl) != 0)
 		goto inhdr_error;
 

net/core/netpoll.c

@@ -310,7 +310,7 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
 
 	skb_push(skb, sizeof(*iph));
 	skb_reset_network_header(skb);
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 
 	/* iph->version = 4; iph->ihl = 5; */
 	put_unaligned(0x45, (unsigned char *)iph);

net/core/pktgen.c

@@ -2391,7 +2391,7 @@ static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
 		VLAN_TAG_SIZE(pkt_dev) - SVLAN_TAG_SIZE(pkt_dev);
 	skb->dev = odev;
 	skb->pkt_type = PACKET_HOST;
-	skb->nh.iph = iph;
+	skb->nh.raw = (unsigned char *)iph;
 	skb->h.uh = udph;
 
 	if (pkt_dev->nfrags <= 0)

net/dccp/ipv4.c

@@ -363,8 +363,8 @@ EXPORT_SYMBOL_GPL(dccp_v4_send_check);
 
 static inline u64 dccp_v4_init_sequence(const struct sk_buff *skb)
 {
-	return secure_dccp_sequence_number(skb->nh.iph->daddr,
+	return secure_dccp_sequence_number(ip_hdr(skb)->daddr,
-					   skb->nh.iph->saddr,
+					   ip_hdr(skb)->saddr,
 					   dccp_hdr(skb)->dccph_dport,
 					   dccp_hdr(skb)->dccph_sport);
 }
@@ -405,7 +405,7 @@ struct sock *dccp_v4_request_recv_sock(struct sock *sk, struct sk_buff *skb,
 	newinet->opt	   = ireq->opt;
 	ireq->opt	   = NULL;
 	newinet->mc_index  = inet_iif(skb);
-	newinet->mc_ttl	   = skb->nh.iph->ttl;
+	newinet->mc_ttl	   = ip_hdr(skb)->ttl;
 	newinet->id	   = jiffies;
 
 	dccp_sync_mss(newsk, dst_mtu(dst));
@@ -428,7 +428,7 @@ EXPORT_SYMBOL_GPL(dccp_v4_request_recv_sock);
 static struct sock *dccp_v4_hnd_req(struct sock *sk, struct sk_buff *skb)
 {
 	const struct dccp_hdr *dh = dccp_hdr(skb);
-	const struct iphdr *iph = skb->nh.iph;
+	const struct iphdr *iph = ip_hdr(skb);
 	struct sock *nsk;
 	struct request_sock **prev;
 	/* Find possible connection requests. */
@@ -460,8 +460,8 @@ static struct dst_entry* dccp_v4_route_skb(struct sock *sk,
 	struct rtable *rt;
 	struct flowi fl = { .oif = ((struct rtable *)skb->dst)->rt_iif,
 			    .nl_u = { .ip4_u =
-				      { .daddr = skb->nh.iph->saddr,
+				      { .daddr = ip_hdr(skb)->saddr,
-					.saddr = skb->nh.iph->daddr,
+					.saddr = ip_hdr(skb)->daddr,
 					.tos = RT_CONN_FLAGS(sk) } },
 			    .proto = sk->sk_protocol,
 			    .uli_u = { .ports =
@@ -513,6 +513,7 @@ static void dccp_v4_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
 {
 	int err;
 	struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
+	const struct iphdr *rxiph;
 	const int dccp_hdr_reset_len = sizeof(struct dccp_hdr) +
 				       sizeof(struct dccp_hdr_ext) +
 				       sizeof(struct dccp_hdr_reset);
@@ -559,13 +560,13 @@ static void dccp_v4_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
 	dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), DCCP_SKB_CB(rxskb)->dccpd_seq);
 
 	dccp_csum_outgoing(skb);
-	dh->dccph_checksum = dccp_v4_csum_finish(skb, rxskb->nh.iph->saddr,
+	rxiph = ip_hdr(rxskb);
-						      rxskb->nh.iph->daddr);
+	dh->dccph_checksum = dccp_v4_csum_finish(skb, rxiph->saddr,
+						 rxiph->daddr);
 
 	bh_lock_sock(dccp_v4_ctl_socket->sk);
 	err = ip_build_and_send_pkt(skb, dccp_v4_ctl_socket->sk,
-				    rxskb->nh.iph->daddr,
+				    rxiph->daddr, rxiph->saddr, NULL);
-				    rxskb->nh.iph->saddr, NULL);
 	bh_unlock_sock(dccp_v4_ctl_socket->sk);
 
 	if (net_xmit_eval(err) == 0) {
@@ -640,8 +641,8 @@ int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
 		goto drop_and_free;
 
 	ireq = inet_rsk(req);
-	ireq->loc_addr = skb->nh.iph->daddr;
+	ireq->loc_addr = ip_hdr(skb)->daddr;
-	ireq->rmt_addr = skb->nh.iph->saddr;
+	ireq->rmt_addr = ip_hdr(skb)->saddr;
 	ireq->opt	= NULL;
 
 	/*
@@ -809,6 +810,7 @@ EXPORT_SYMBOL_GPL(dccp_invalid_packet);
 static int dccp_v4_rcv(struct sk_buff *skb)
 {
 	const struct dccp_hdr *dh;
+	const struct iphdr *iph;
 	struct sock *sk;
 	int min_cov;
 
@@ -817,8 +819,9 @@ static int dccp_v4_rcv(struct sk_buff *skb)
 	if (dccp_invalid_packet(skb))
 		goto discard_it;
 
+	iph = ip_hdr(skb);
 	/* Step 1: If header checksum is incorrect, drop packet and return */
-	if (dccp_v4_csum_finish(skb, skb->nh.iph->saddr, skb->nh.iph->daddr)) {
+	if (dccp_v4_csum_finish(skb, iph->saddr, iph->daddr)) {
 		DCCP_WARN("dropped packet with invalid checksum\n");
 		goto discard_it;
 	}
@@ -832,8 +835,8 @@ static int dccp_v4_rcv(struct sk_buff *skb)
 		      "src=%u.%u.%u.%u@%-5d "
 		      "dst=%u.%u.%u.%u@%-5d seq=%llu",
 		      dccp_packet_name(dh->dccph_type),
-		      NIPQUAD(skb->nh.iph->saddr), ntohs(dh->dccph_sport),
+		      NIPQUAD(iph->saddr), ntohs(dh->dccph_sport),
-		      NIPQUAD(skb->nh.iph->daddr), ntohs(dh->dccph_dport),
+		      NIPQUAD(iph->daddr), ntohs(dh->dccph_dport),
 		      (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq);
 
 	if (dccp_packet_without_ack(skb)) {
@@ -848,10 +851,8 @@ static int dccp_v4_rcv(struct sk_buff *skb)
 	/* Step 2:
 	 *	Look up flow ID in table and get corresponding socket */
 	sk = __inet_lookup(&dccp_hashinfo,
-			   skb->nh.iph->saddr, dh->dccph_sport,
+			   iph->saddr, dh->dccph_sport,
-			   skb->nh.iph->daddr, dh->dccph_dport,
+			   iph->daddr, dh->dccph_dport, inet_iif(skb));
-			   inet_iif(skb));
-
 	/*
 	 * Step 2:
 	 *	If no socket ...

net/econet/af_econet.c

@@ -848,7 +848,7 @@ static void aun_send_response(__u32 addr, unsigned long seq, int code, int cb)
 
 static void aun_incoming(struct sk_buff *skb, struct aunhdr *ah, size_t len)
 {
-	struct iphdr *ip = skb->nh.iph;
+	struct iphdr *ip = ip_hdr(skb);
 	unsigned char stn = ntohl(ip->saddr) & 0xff;
 	struct sock *sk;
 	struct sk_buff *newskb;
@@ -946,7 +946,7 @@ static void aun_data_available(struct sock *sk, int slen)
 	data = skb->h.raw + sizeof(struct udphdr);
 	ah = (struct aunhdr *)data;
 	len = skb->len - sizeof(struct udphdr);
-	ip = skb->nh.iph;
+	ip = ip_hdr(skb);
 
 	switch (ah->code)
 	{

net/ieee80211/ieee80211_tx.c

@@ -228,7 +228,7 @@ static int ieee80211_classify(struct sk_buff *skb)
 	if (eth->h_proto != htons(ETH_P_IP))
 		return 0;
 
-	ip = skb->nh.iph;
+	ip = ip_hdr(skb);
 	switch (ip->tos & 0xfc) {
 	case 0x20:
 		return 2;

net/ipv4/af_inet.c

@@ -1112,7 +1112,7 @@ static int inet_gso_send_check(struct sk_buff *skb)
 	if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
 		goto out;
 
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 	ihl = iph->ihl * 4;
 	if (ihl < sizeof(*iph))
 		goto out;
@@ -1121,7 +1121,7 @@ static int inet_gso_send_check(struct sk_buff *skb)
 		goto out;
 
 	skb->h.raw = __skb_pull(skb, ihl);
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 	proto = iph->protocol & (MAX_INET_PROTOS - 1);
 	err = -EPROTONOSUPPORT;
 
@@ -1155,7 +1155,7 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features)
 	if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
 		goto out;
 
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 	ihl = iph->ihl * 4;
 	if (ihl < sizeof(*iph))
 		goto out;
@@ -1164,7 +1164,7 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features)
 		goto out;
 
 	skb->h.raw = __skb_pull(skb, ihl);
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 	id = ntohs(iph->id);
 	proto = iph->protocol & (MAX_INET_PROTOS - 1);
 	segs = ERR_PTR(-EPROTONOSUPPORT);
@@ -1180,7 +1180,7 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features)
 
 	skb = segs;
 	do {
-		iph = skb->nh.iph;
+		iph = ip_hdr(skb);
 		iph->id = htons(id++);
 		iph->tot_len = htons(skb->len - skb->mac_len);
 		iph->check = 0;

net/ipv4/ah4.c

@@ -65,7 +65,7 @@ static int ah_output(struct xfrm_state *x, struct sk_buff *skb)
 		char 		buf[60];
 	} tmp_iph;
 
-	top_iph = skb->nh.iph;
+	top_iph = ip_hdr(skb);
 	iph = &tmp_iph.iph;
 
 	iph->tos = top_iph->tos;
@@ -152,7 +152,7 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
 	skb->ip_summed = CHECKSUM_NONE;
 
 	ah = (struct ip_auth_hdr*)skb->data;
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 
 	ihl = skb->data - skb_network_header(skb);
 	memcpy(work_buf, iph, ihl);

net/ipv4/arp.c

@@ -342,13 +342,13 @@ static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb)
 	switch (IN_DEV_ARP_ANNOUNCE(in_dev)) {
 	default:
 	case 0:		/* By default announce any local IP */
-		if (skb && inet_addr_type(skb->nh.iph->saddr) == RTN_LOCAL)
+		if (skb && inet_addr_type(ip_hdr(skb)->saddr) == RTN_LOCAL)
-			saddr = skb->nh.iph->saddr;
+			saddr = ip_hdr(skb)->saddr;
 		break;
 	case 1:		/* Restrict announcements of saddr in same subnet */
 		if (!skb)
 			break;
-		saddr = skb->nh.iph->saddr;
+		saddr = ip_hdr(skb)->saddr;
 		if (inet_addr_type(saddr) == RTN_LOCAL) {
 			/* saddr should be known to target */
 			if (inet_addr_onlink(in_dev, target, saddr))

net/ipv4/cipso_ipv4.c

@@ -1676,7 +1676,7 @@ validate_return:
  */
 void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway)
 {
-	if (skb->nh.iph->protocol == IPPROTO_ICMP || error != -EACCES)
+	if (ip_hdr(skb)->protocol == IPPROTO_ICMP || error != -EACCES)
 		return;
 
 	if (gateway)

net/ipv4/esp4.c

@@ -58,7 +58,7 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
 	pskb_put(skb, trailer, clen - skb->len);
 
 	__skb_push(skb, skb->data - skb_network_header(skb));
-	top_iph = skb->nh.iph;
+	top_iph = ip_hdr(skb);
 	esph = (struct ip_esp_hdr *)(skb_network_header(skb) +
 				     top_iph->ihl * 4);
 	top_iph->tot_len = htons(skb->len + alen);
@@ -218,7 +218,7 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
 
 	/* ... check padding bits here. Silly. :-) */
 
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 	ihl = iph->ihl * 4;
 
 	if (x->encap) {

net/ipv4/icmp.c

@@ -392,7 +392,7 @@ static void icmp_reply(struct icmp_bxm *icmp_param, struct sk_buff *skb)
 	icmp_param->data.icmph.checksum = 0;
 	icmp_out_count(icmp_param->data.icmph.type);
 
-	inet->tos = skb->nh.iph->tos;
+	inet->tos = ip_hdr(skb)->tos;
 	daddr = ipc.addr = rt->rt_src;
 	ipc.opt = NULL;
 	if (icmp_param->replyopts.optlen) {
@@ -404,7 +404,7 @@ static void icmp_reply(struct icmp_bxm *icmp_param, struct sk_buff *skb)
 		struct flowi fl = { .nl_u = { .ip4_u =
 					      { .daddr = daddr,
 						.saddr = rt->rt_spec_dst,
-						.tos = RT_TOS(skb->nh.iph->tos) } },
+						.tos = RT_TOS(ip_hdr(skb)->tos) } },
 				    .proto = IPPROTO_ICMP };
 		security_skb_classify_flow(skb, &fl);
 		if (ip_route_output_key(&rt, &fl))
@@ -448,7 +448,7 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info)
 	 *	Check this, icmp_send is called from the most obscure devices
 	 *	sometimes.
 	 */
-	iph = skb_in->nh.iph;
+	iph = ip_hdr(skb_in);
 
 	if ((u8 *)iph < skb_in->head || (u8 *)(iph + 1) > skb_in->tail)
 		goto out;
@@ -676,7 +676,7 @@ static void icmp_unreach(struct sk_buff *skb)
 			printk(KERN_WARNING "%u.%u.%u.%u sent an invalid ICMP "
 					    "type %u, code %u "
 					    "error to a broadcast: %u.%u.%u.%u on %s\n",
-			       NIPQUAD(skb->nh.iph->saddr),
+			       NIPQUAD(ip_hdr(skb)->saddr),
 			       icmph->type, icmph->code,
 			       NIPQUAD(iph->daddr),
 			       skb->dev->name);
@@ -751,7 +751,7 @@ static void icmp_redirect(struct sk_buff *skb)
 		 */
 	case ICMP_REDIR_HOST:
 	case ICMP_REDIR_HOSTTOS:
-		ip_rt_redirect(skb->nh.iph->saddr, iph->daddr,
+		ip_rt_redirect(ip_hdr(skb)->saddr, iph->daddr,
 			       skb->h.icmph->un.gateway,
 			       iph->saddr, skb->dev);
 		break;

net/ipv4/igmp.c

@@ -315,7 +315,7 @@ static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
 	skb_reserve(skb, LL_RESERVED_SPACE(dev));
 
 	skb_reset_network_header(skb);
-	pip = skb->nh.iph;
+	pip = ip_hdr(skb);
 	skb_put(skb, sizeof(struct iphdr) + 4);
 
 	pip->version  = 4;
@@ -345,16 +345,14 @@ static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
 
 static int igmpv3_sendpack(struct sk_buff *skb)
 {
-	struct iphdr *pip = skb->nh.iph;
+	struct iphdr *pip = ip_hdr(skb);
 	struct igmphdr *pig = skb->h.igmph;
-	int iplen, igmplen;
+	const int iplen = skb->tail - skb->nh.raw;
+	const int igmplen = skb->tail - skb->h.raw;
 
-	iplen = skb->tail - (unsigned char *)skb->nh.iph;
 	pip->tot_len = htons(iplen);
 	ip_send_check(pip);
-
+	pig->csum = ip_compute_csum(skb->h.igmph, igmplen);
-	igmplen = skb->tail - (unsigned char *)skb->h.igmph;
-	pig->csum = ip_compute_csum((void *)skb->h.igmph, igmplen);
 
 	return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev,
 		       dst_output);
@@ -667,7 +665,7 @@ static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 	skb_reserve(skb, LL_RESERVED_SPACE(dev));
 
 	skb_reset_network_header(skb);
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 	skb_put(skb, sizeof(struct iphdr) + 4);
 
 	iph->version  = 4;

net/ipv4/ip_forward.c

@@ -74,7 +74,7 @@ int ip_forward(struct sk_buff *skb)
 	 *	that reaches zero, we must reply an ICMP control message telling
 	 *	that the packet's lifetime expired.
 	 */
-	if (skb->nh.iph->ttl <= 1)
+	if (ip_hdr(skb)->ttl <= 1)
 		goto too_many_hops;
 
 	if (!xfrm4_route_forward(skb))
@@ -88,7 +88,7 @@ int ip_forward(struct sk_buff *skb)
 	/* We are about to mangle packet. Copy it! */
 	if (skb_cow(skb, LL_RESERVED_SPACE(rt->u.dst.dev)+rt->u.dst.header_len))
 		goto drop;
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 
 	/* Decrease ttl after skb cow done */
 	ip_decrease_ttl(iph);

net/ipv4/ip_fragment.c

@@ -479,7 +479,7 @@ static void ip_frag_queue(struct ipq *qp, struct sk_buff *skb)
 		goto err;
 	}
 
-	offset = ntohs(skb->nh.iph->frag_off);
+	offset = ntohs(ip_hdr(skb)->frag_off);
 	flags = offset & ~IP_OFFSET;
 	offset &= IP_OFFSET;
 	offset <<= 3;		/* offset is in 8-byte chunks */
@@ -676,7 +676,7 @@ static struct sk_buff *ip_frag_reasm(struct ipq *qp, struct net_device *dev)
 	head->dev = dev;
 	head->tstamp = qp->stamp;
 
-	iph = head->nh.iph;
+	iph = ip_hdr(head);
 	iph->frag_off = 0;
 	iph->tot_len = htons(len);
 	IP_INC_STATS_BH(IPSTATS_MIB_REASMOKS);
@@ -700,7 +700,6 @@ out_fail:
 /* Process an incoming IP datagram fragment. */
 struct sk_buff *ip_defrag(struct sk_buff *skb, u32 user)
 {
-	struct iphdr *iph = skb->nh.iph;
 	struct ipq *qp;
 	struct net_device *dev;
 
@@ -713,7 +712,7 @@ struct sk_buff *ip_defrag(struct sk_buff *skb, u32 user)
 	dev = skb->dev;
 
 	/* Lookup (or create) queue header */
-	if ((qp = ip_find(iph, user)) != NULL) {
+	if ((qp = ip_find(ip_hdr(skb), user)) != NULL) {
 		struct sk_buff *ret = NULL;
 
 		spin_lock(&qp->lock);

net/ipv4/ip_gre.c

@@ -533,7 +533,7 @@ static inline void ipgre_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)
 {
 	if (INET_ECN_is_ce(iph->tos)) {
 		if (skb->protocol == htons(ETH_P_IP)) {
-			IP_ECN_set_ce(skb->nh.iph);
+			IP_ECN_set_ce(ip_hdr(skb));
 		} else if (skb->protocol == htons(ETH_P_IPV6)) {
 			IP6_ECN_set_ce(skb->nh.ipv6h);
 		}
@@ -565,7 +565,7 @@ static int ipgre_rcv(struct sk_buff *skb)
 	if (!pskb_may_pull(skb, 16))
 		goto drop_nolock;
 
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 	h = skb->data;
 	flags = *(__be16*)h;
 
@@ -670,7 +670,7 @@ static int ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	struct ip_tunnel *tunnel = netdev_priv(dev);
 	struct net_device_stats *stats = &tunnel->stat;
-	struct iphdr  *old_iph = skb->nh.iph;
+	struct iphdr  *old_iph = ip_hdr(skb);
 	struct iphdr  *tiph;
 	u8     tos;
 	__be16 df;
@@ -825,7 +825,7 @@ static int ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
 			skb_set_owner_w(new_skb, skb->sk);
 		dev_kfree_skb(skb);
 		skb = new_skb;
-		old_iph = skb->nh.iph;
+		old_iph = ip_hdr(skb);
 	}
 
 	skb->h.raw = skb->nh.raw;
@@ -841,7 +841,7 @@ static int ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
 	 *	Push down and install the IPIP header.
 	 */
 
-	iph 			=	skb->nh.iph;
+	iph 			=	ip_hdr(skb);
 	iph->version		=	4;
 	iph->ihl		=	sizeof(struct iphdr) >> 2;
 	iph->frag_off		=	df;

net/ipv4/ip_input.c

@@ -158,7 +158,7 @@ DEFINE_SNMP_STAT(struct ipstats_mib, ip_statistics) __read_mostly;
 int ip_call_ra_chain(struct sk_buff *skb)
 {
 	struct ip_ra_chain *ra;
-	u8 protocol = skb->nh.iph->protocol;
+	u8 protocol = ip_hdr(skb)->protocol;
 	struct sock *last = NULL;
 
 	read_lock(&ip_ra_lock);
@@ -171,7 +171,7 @@ int ip_call_ra_chain(struct sk_buff *skb)
 		if (sk && inet_sk(sk)->num == protocol &&
 		    (!sk->sk_bound_dev_if ||
 		     sk->sk_bound_dev_if == skb->dev->ifindex)) {
-			if (skb->nh.iph->frag_off & htons(IP_MF|IP_OFFSET)) {
+			if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) {
 				skb = ip_defrag(skb, IP_DEFRAG_CALL_RA_CHAIN);
 				if (skb == NULL) {
 					read_unlock(&ip_ra_lock);
@@ -206,7 +206,7 @@ static inline int ip_local_deliver_finish(struct sk_buff *skb)
 	rcu_read_lock();
 	{
 		/* Note: See raw.c and net/raw.h, RAWV4_HTABLE_SIZE==MAX_INET_PROTOS */
-		int protocol = skb->nh.iph->protocol;
+		int protocol = ip_hdr(skb)->protocol;
 		int hash;
 		struct sock *raw_sk;
 		struct net_protocol *ipprot;
@@ -218,7 +218,7 @@ static inline int ip_local_deliver_finish(struct sk_buff *skb)
 		/* If there maybe a raw socket we must check - if not we
 		 * don't care less
 		 */
-		if (raw_sk && !raw_v4_input(skb, skb->nh.iph, hash))
+		if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash))
 			raw_sk = NULL;
 
 		if ((ipprot = rcu_dereference(inet_protos[hash])) != NULL) {
@@ -264,7 +264,7 @@ int ip_local_deliver(struct sk_buff *skb)
 	 *	Reassemble IP fragments.
 	 */
 
-	if (skb->nh.iph->frag_off & htons(IP_MF|IP_OFFSET)) {
+	if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) {
 		skb = ip_defrag(skb, IP_DEFRAG_LOCAL_DELIVER);
 		if (!skb)
 			return 0;
@@ -292,7 +292,7 @@ static inline int ip_rcv_options(struct sk_buff *skb)
 		goto drop;
 	}
 
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 
 	if (ip_options_compile(NULL, skb)) {
 		IP_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS);
@@ -328,7 +328,7 @@ drop:
 
 static inline int ip_rcv_finish(struct sk_buff *skb)
 {
-	struct iphdr *iph = skb->nh.iph;
+	const struct iphdr *iph = ip_hdr(skb);
 
 	/*
 	 *	Initialise the virtual path cache for the packet. It describes
@@ -389,7 +389,7 @@ int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
 	if (!pskb_may_pull(skb, sizeof(struct iphdr)))
 		goto inhdr_error;
 
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 
 	/*
 	 *	RFC1122: 3.1.2.2 MUST silently discard any IP frame that fails the checksum.
@@ -408,7 +408,7 @@ int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
 	if (!pskb_may_pull(skb, iph->ihl*4))
 		goto inhdr_error;
 
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 
 	if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
 		goto inhdr_error;

net/ipv4/ip_options.c

@@ -110,7 +110,7 @@ int ip_options_echo(struct ip_options * dopt, struct sk_buff * skb)
 	if (skb->dst)
 		daddr = ((struct rtable*)skb->dst)->rt_spec_dst;
 	else
-		daddr = skb->nh.iph->daddr;
+		daddr = ip_hdr(skb)->daddr;
 
 	if (sopt->rr) {
 		optlen  = sptr[sopt->rr+1];
@@ -180,7 +180,8 @@ int ip_options_echo(struct ip_options * dopt, struct sk_buff * skb)
 			/*
 			 * RFC1812 requires to fix illegal source routes.
 			 */
-			if (memcmp(&skb->nh.iph->saddr, &start[soffset+3], 4) == 0)
+			if (memcmp(&ip_hdr(skb)->saddr,
+				   &start[soffset + 3], 4) == 0)
 				doffset -= 4;
 		}
 		if (doffset > 3) {
@@ -269,7 +270,8 @@ int ip_options_compile(struct ip_options * opt, struct sk_buff * skb)
 		optptr = iph + sizeof(struct iphdr);
 		opt->is_data = 0;
 	} else {
-		optptr = opt->is_data ? opt->__data : (unsigned char*)&(skb->nh.iph[1]);
+		optptr = opt->is_data ? opt->__data :
+					(unsigned char *)&(ip_hdr(skb)[1]);
 		iph = optptr - sizeof(struct iphdr);
 	}
 
@@ -587,7 +589,7 @@ void ip_forward_options(struct sk_buff *skb)
 		if (srrptr + 3 <= srrspace) {
 			opt->is_changed = 1;
 			ip_rt_get_source(&optptr[srrptr-1], rt);
-			skb->nh.iph->daddr = rt->rt_dst;
+			ip_hdr(skb)->daddr = rt->rt_dst;
 			optptr[2] = srrptr+4;
 		} else if (net_ratelimit())
 			printk(KERN_CRIT "ip_forward(): Argh! Destination lost!\n");
@@ -599,7 +601,7 @@ void ip_forward_options(struct sk_buff *skb)
 	}
 	if (opt->is_changed) {
 		opt->is_changed = 0;
-		ip_send_check(skb->nh.iph);
+		ip_send_check(ip_hdr(skb));
 	}
 }
 
@@ -608,7 +610,7 @@ int ip_options_rcv_srr(struct sk_buff *skb)
 	struct ip_options *opt = &(IPCB(skb)->opt);
 	int srrspace, srrptr;
 	__be32 nexthop;
-	struct iphdr *iph = skb->nh.iph;
+	struct iphdr *iph = ip_hdr(skb);
 	unsigned char *optptr = skb_network_header(skb) + opt->srr;
 	struct rtable *rt = (struct rtable*)skb->dst;
 	struct rtable *rt2;

net/ipv4/ip_output.c

@@ -127,7 +127,7 @@ int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
 	/* Build the IP header. */
 	skb_push(skb, sizeof(struct iphdr) + (opt ? opt->optlen : 0));
 	skb_reset_network_header(skb);
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 	iph->version  = 4;
 	iph->ihl      = 5;
 	iph->tos      = inet->tos;
@@ -245,7 +245,7 @@ int ip_mc_output(struct sk_buff *skb)
 
 		/* Multicasts with ttl 0 must not go beyond the host */
 
-		if (skb->nh.iph->ttl == 0) {
+		if (ip_hdr(skb)->ttl == 0) {
 			kfree_skb(skb);
 			return 0;
 		}
@@ -332,7 +332,7 @@ packet_routed:
 	/* OK, we know where to send it, allocate and build IP header. */
 	skb_push(skb, sizeof(struct iphdr) + (opt ? opt->optlen : 0));
 	skb_reset_network_header(skb);
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 	*((__be16 *)iph) = htons((4 << 12) | (5 << 8) | (inet->tos & 0xff));
 	iph->tot_len = htons(skb->len);
 	if (ip_dont_fragment(sk, &rt->u.dst) && !ipfragok)
@@ -428,7 +428,7 @@ int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff*))
 	 *	Point into the IP datagram header.
 	 */
 
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 
 	if (unlikely((iph->frag_off & htons(IP_DF)) && !skb->local_df)) {
 		IP_INC_STATS(IPSTATS_MIB_FRAGFAILS);
@@ -504,7 +504,7 @@ int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff*))
 				__skb_push(frag, hlen);
 				skb_reset_network_header(frag);
 				memcpy(skb_network_header(frag), iph, hlen);
-				iph = frag->nh.iph;
+				iph = ip_hdr(frag);
 				iph->tot_len = htons(frag->len);
 				ip_copy_metadata(frag, skb);
 				if (offset == 0)
@@ -619,7 +619,7 @@ slow_path:
 		/*
 		 *	Fill in the new header fields.
 		 */
-		iph = skb2->nh.iph;
+		iph = ip_hdr(skb2);
 		iph->frag_off = htons((offset >> 3));
 
 		/* ANK: dirty, but effective trick. Upgrade options only if
@@ -1125,7 +1125,7 @@ ssize_t	ip_append_page(struct sock *sk, struct page *page,
 			 */
 			data = skb_put(skb, fragheaderlen + fraggap);
 			skb_reset_network_header(skb);
-			iph = skb->nh.iph;
+			iph = ip_hdr(skb);
 			data += fragheaderlen;
 			skb->h.raw = data;
 
@@ -1352,7 +1352,7 @@ void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *ar
 		struct flowi fl = { .nl_u = { .ip4_u =
 					      { .daddr = daddr,
 						.saddr = rt->rt_spec_dst,
-						.tos = RT_TOS(skb->nh.iph->tos) } },
+						.tos = RT_TOS(ip_hdr(skb)->tos) } },
 				    /* Not quite clean, but right. */
 				    .uli_u = { .ports =
 					       { .sport = skb->h.th->dest,
@@ -1370,9 +1370,9 @@ void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *ar
 	   with locally disabled BH and that sk cannot be already spinlocked.
 	 */
 	bh_lock_sock(sk);
-	inet->tos = skb->nh.iph->tos;
+	inet->tos = ip_hdr(skb)->tos;
 	sk->sk_priority = skb->priority;
-	sk->sk_protocol = skb->nh.iph->protocol;
+	sk->sk_protocol = ip_hdr(skb)->protocol;
 	ip_append_data(sk, ip_reply_glue_bits, arg->iov->iov_base, len, 0,
 		       &ipc, rt, MSG_DONTWAIT);
 	if ((skb = skb_peek(&sk->sk_write_queue)) != NULL) {

net/ipv4/ip_sockglue.c

@@ -59,7 +59,7 @@ static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
 	struct in_pktinfo info;
 	struct rtable *rt = (struct rtable *)skb->dst;
 
-	info.ipi_addr.s_addr = skb->nh.iph->daddr;
+	info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
 	if (rt) {
 		info.ipi_ifindex = rt->rt_iif;
 		info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
@@ -73,13 +73,13 @@ static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
 
 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
 {
-	int ttl = skb->nh.iph->ttl;
+	int ttl = ip_hdr(skb)->ttl;
 	put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
 }
 
 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
 {
-	put_cmsg(msg, SOL_IP, IP_TOS, 1, &skb->nh.iph->tos);
+	put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
 }
 
 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
@@ -87,7 +87,8 @@ static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
 	if (IPCB(skb)->opt.optlen == 0)
 		return;
 
-	put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, skb->nh.iph+1);
+	put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
+		 ip_hdr(skb) + 1);
 }
 
 
@@ -299,7 +300,7 @@ void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 inf
 
 	skb_put(skb, sizeof(struct iphdr));
 	skb_reset_network_header(skb);
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 	iph->daddr = daddr;
 
 	serr = SKB_EXT_ERR(skb);
@@ -369,7 +370,7 @@ int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
 		struct inet_sock *inet = inet_sk(sk);
 
 		sin->sin_family = AF_INET;
-		sin->sin_addr.s_addr = skb->nh.iph->saddr;
+		sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
 		sin->sin_port = 0;
 		memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 		if (inet->cmsg_flags)

net/ipv4/ipcomp.c

@@ -43,21 +43,15 @@ static LIST_HEAD(ipcomp_tfms_list);
 
 static int ipcomp_decompress(struct xfrm_state *x, struct sk_buff *skb)
 {
-	int err, plen, dlen;
 	struct ipcomp_data *ipcd = x->data;
-	u8 *start, *scratch;
+	const int plen = skb->len;
-	struct crypto_comp *tfm;
+	int dlen = IPCOMP_SCRATCH_SIZE;
-	int cpu;
+	const u8 *start = skb->data;
+	const int cpu = get_cpu();
+	u8 *scratch = *per_cpu_ptr(ipcomp_scratches, cpu);
+	struct crypto_comp *tfm = *per_cpu_ptr(ipcd->tfms, cpu);
+	int err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen);
 
-	plen = skb->len;
-	dlen = IPCOMP_SCRATCH_SIZE;
-	start = skb->data;
-
-	cpu = get_cpu();
-	scratch = *per_cpu_ptr(ipcomp_scratches, cpu);
-	tfm = *per_cpu_ptr(ipcd->tfms, cpu);
-
-	err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen);
 	if (err)
 		goto out;
 
@@ -90,7 +84,7 @@ static int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb)
 	skb->ip_summed = CHECKSUM_NONE;
 
 	/* Remove ipcomp header and decompress original payload */
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 	ipch = (void *)skb->data;
 	iph->protocol = ipch->nexthdr;
 	skb->h.raw = skb->nh.raw + sizeof(*ipch);
@@ -103,23 +97,16 @@ out:
 
 static int ipcomp_compress(struct xfrm_state *x, struct sk_buff *skb)
 {
-	int err, plen, dlen, ihlen;
-	struct iphdr *iph = skb->nh.iph;
 	struct ipcomp_data *ipcd = x->data;
-	u8 *start, *scratch;
+	const int ihlen = ip_hdrlen(skb);
-	struct crypto_comp *tfm;
+	const int plen = skb->len - ihlen;
-	int cpu;
+	int dlen = IPCOMP_SCRATCH_SIZE;
+	u8 *start = skb->data + ihlen;
+	const int cpu = get_cpu();
+	u8 *scratch = *per_cpu_ptr(ipcomp_scratches, cpu);
+	struct crypto_comp *tfm = *per_cpu_ptr(ipcd->tfms, cpu);
+	int err = crypto_comp_compress(tfm, start, plen, scratch, &dlen);
 
-	ihlen = iph->ihl * 4;
-	plen = skb->len - ihlen;
-	dlen = IPCOMP_SCRATCH_SIZE;
-	start = skb->data + ihlen;
-
-	cpu = get_cpu();
-	scratch = *per_cpu_ptr(ipcomp_scratches, cpu);
-	tfm = *per_cpu_ptr(ipcd->tfms, cpu);
-
-	err = crypto_comp_compress(tfm, start, plen, scratch, &dlen);
 	if (err)
 		goto out;
 
@@ -142,12 +129,11 @@ out:
 static int ipcomp_output(struct xfrm_state *x, struct sk_buff *skb)
 {
 	int err;
-	struct iphdr *iph;
 	struct ip_comp_hdr *ipch;
 	struct ipcomp_data *ipcd = x->data;
 	int hdr_len = 0;
+	struct iphdr *iph = ip_hdr(skb);
 
-	iph = skb->nh.iph;
 	iph->tot_len = htons(skb->len);
 	hdr_len = iph->ihl * 4;
 	if ((skb->len - hdr_len) < ipcd->threshold) {
@@ -159,7 +145,7 @@ static int ipcomp_output(struct xfrm_state *x, struct sk_buff *skb)
 		goto out_ok;
 
 	err = ipcomp_compress(x, skb);
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 
 	if (err) {
 		goto out_ok;

net/ipv4/ipconfig.c

@@ -703,7 +703,7 @@ static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_d
 
 	/* Construct IP header */
 	skb_reset_network_header(skb);
-	h = skb->nh.iph;
+	h = ip_hdr(skb);
 	h->version = 4;
 	h->ihl = 5;
 	h->tot_len = htons(sizeof(struct bootp_pkt));
@@ -846,7 +846,7 @@ static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, str
 			   sizeof(struct udphdr)))
 		goto drop;
 
-	b = (struct bootp_pkt *) skb->nh.iph;
+	b = (struct bootp_pkt *)skb_network_header(skb);
 	h = &b->iph;
 
 	if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
@@ -884,7 +884,7 @@ static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, str
 	if (!pskb_may_pull(skb, skb->len))
 		goto drop;
 
-	b = (struct bootp_pkt *) skb->nh.iph;
+	b = (struct bootp_pkt *)skb_network_header(skb);
 	h = &b->iph;
 
 	/* One reply at a time, please. */

net/ipv4/ipip.c

@@ -461,9 +461,10 @@ out:
 #endif
 }
 
-static inline void ipip_ecn_decapsulate(struct iphdr *outer_iph, struct sk_buff *skb)
+static inline void ipip_ecn_decapsulate(const struct iphdr *outer_iph,
+					struct sk_buff *skb)
 {
-	struct iphdr *inner_iph = skb->nh.iph;
+	struct iphdr *inner_iph = ip_hdr(skb);
 
 	if (INET_ECN_is_ce(outer_iph->tos))
 		IP_ECN_set_ce(inner_iph);
@@ -471,10 +472,8 @@ static inline void ipip_ecn_decapsulate(struct iphdr *outer_iph, struct sk_buff
 
 static int ipip_rcv(struct sk_buff *skb)
 {
-	struct iphdr *iph;
 	struct ip_tunnel *tunnel;
-
+	const struct iphdr *iph = ip_hdr(skb);
-	iph = skb->nh.iph;
 
 	read_lock(&ipip_lock);
 	if ((tunnel = ipip_tunnel_lookup(iph->saddr, iph->daddr)) != NULL) {
@@ -521,7 +520,7 @@ static int ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
 	__be16 df = tiph->frag_off;
 	struct rtable *rt;     			/* Route to the other host */
 	struct net_device *tdev;			/* Device to other host */
-	struct iphdr  *old_iph = skb->nh.iph;
+	struct iphdr  *old_iph = ip_hdr(skb);
 	struct iphdr  *iph;			/* Our new IP header */
 	int    max_headroom;			/* The extra header space needed */
 	__be32 dst = tiph->daddr;
@@ -615,7 +614,7 @@ static int ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
 			skb_set_owner_w(new_skb, skb->sk);
 		dev_kfree_skb(skb);
 		skb = new_skb;
-		old_iph = skb->nh.iph;
+		old_iph = ip_hdr(skb);
 	}
 
 	skb->h.raw = skb->nh.raw;
@@ -631,7 +630,7 @@ static int ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
 	 *	Push down and install the IPIP header.
 	 */
 
-	iph 			=	skb->nh.iph;
+	iph 			=	ip_hdr(skb);
 	iph->version		=	4;
 	iph->ihl		=	sizeof(struct iphdr)>>2;
 	iph->frag_off		=	df;

net/ipv4/ipmr.c

@@ -303,7 +303,7 @@ static void ipmr_destroy_unres(struct mfc_cache *c)
 	atomic_dec(&cache_resolve_queue_len);
 
 	while ((skb=skb_dequeue(&c->mfc_un.unres.unresolved))) {
-		if (skb->nh.iph->version == 0) {
+		if (ip_hdr(skb)->version == 0) {
 			struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
 			nlh->nlmsg_type = NLMSG_ERROR;
 			nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
@@ -509,7 +509,7 @@ static void ipmr_cache_resolve(struct mfc_cache *uc, struct mfc_cache *c)
 	 */
 
 	while ((skb=__skb_dequeue(&uc->mfc_un.unres.unresolved))) {
-		if (skb->nh.iph->version == 0) {
+		if (ip_hdr(skb)->version == 0) {
 			struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
 
 			if (ipmr_fill_mroute(skb, c, NLMSG_DATA(nlh)) > 0) {
@@ -569,8 +569,9 @@ static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert)
 		msg->im_msgtype = IGMPMSG_WHOLEPKT;
 		msg->im_mbz = 0;
 		msg->im_vif = reg_vif_num;
-		skb->nh.iph->ihl = sizeof(struct iphdr) >> 2;
+		ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2;
-		skb->nh.iph->tot_len = htons(ntohs(pkt->nh.iph->tot_len) + sizeof(struct iphdr));
+		ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) +
+					     sizeof(struct iphdr));
 	} else
 #endif
 	{
@@ -579,10 +580,10 @@ static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert)
 	 *	Copy the IP header
 	 */
 
-	skb->nh.iph = (struct iphdr *)skb_put(skb, ihl);
+	skb->nh.raw = skb_put(skb, ihl);
 	memcpy(skb->data,pkt->data,ihl);
-	skb->nh.iph->protocol = 0;			/* Flag to the kernel this is a route add */
+	ip_hdr(skb)->protocol = 0;			/* Flag to the kernel this is a route add */
-	msg = (struct igmpmsg*)skb->nh.iph;
+	msg = (struct igmpmsg *)skb_network_header(skb);
 	msg->im_vif = vifi;
 	skb->dst = dst_clone(pkt->dst);
 
@@ -594,7 +595,7 @@ static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert)
 	igmp->type	=
 	msg->im_msgtype = assert;
 	igmp->code 	=	0;
-	skb->nh.iph->tot_len=htons(skb->len);			/* Fix the length */
+	ip_hdr(skb)->tot_len = htons(skb->len);			/* Fix the length */
 	skb->h.raw = skb->nh.raw;
 	}
 
@@ -624,11 +625,12 @@ ipmr_cache_unresolved(vifi_t vifi, struct sk_buff *skb)
 {
 	int err;
 	struct mfc_cache *c;
+	const struct iphdr *iph = ip_hdr(skb);
 
 	spin_lock_bh(&mfc_unres_lock);
 	for (c=mfc_unres_queue; c; c=c->next) {
-		if (c->mfc_mcastgrp == skb->nh.iph->daddr &&
+		if (c->mfc_mcastgrp == iph->daddr &&
-		    c->mfc_origin == skb->nh.iph->saddr)
+		    c->mfc_origin == iph->saddr)
 			break;
 	}
 
@@ -648,9 +650,9 @@ ipmr_cache_unresolved(vifi_t vifi, struct sk_buff *skb)
 		/*
 		 *	Fill in the new cache entry
 		 */
-		c->mfc_parent=-1;
+		c->mfc_parent	= -1;
-		c->mfc_origin=skb->nh.iph->saddr;
+		c->mfc_origin	= iph->saddr;
-		c->mfc_mcastgrp=skb->nh.iph->daddr;
+		c->mfc_mcastgrp	= iph->daddr;
 
 		/*
 		 *	Reflect first query at mrouted.
@@ -1096,12 +1098,12 @@ static struct notifier_block ip_mr_notifier={
 static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr)
 {
 	struct iphdr *iph;
-	struct iphdr *old_iph = skb->nh.iph;
+	struct iphdr *old_iph = ip_hdr(skb);
 
 	skb_push(skb, sizeof(struct iphdr));
-	skb->h.ipiph = skb->nh.iph;
+	skb->h.raw = skb->nh.raw;
 	skb_reset_network_header(skb);
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 
 	iph->version	= 	4;
 	iph->tos	=	old_iph->tos;
@@ -1137,7 +1139,7 @@ static inline int ipmr_forward_finish(struct sk_buff *skb)
 
 static void ipmr_queue_xmit(struct sk_buff *skb, struct mfc_cache *c, int vifi)
 {
-	struct iphdr *iph = skb->nh.iph;
+	const struct iphdr *iph = ip_hdr(skb);
 	struct vif_device *vif = &vif_table[vifi];
 	struct net_device *dev;
 	struct rtable *rt;
@@ -1203,8 +1205,7 @@ static void ipmr_queue_xmit(struct sk_buff *skb, struct mfc_cache *c, int vifi)
 
 	dst_release(skb->dst);
 	skb->dst = &rt->u.dst;
-	iph = skb->nh.iph;
+	ip_decrease_ttl(ip_hdr(skb));
-	ip_decrease_ttl(iph);
 
 	/* FIXME: forward and output firewalls used to be called here.
 	 * What do we do with netfilter? -- RR */
@@ -1304,7 +1305,7 @@ static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local
 	 *	Forward the frame
 	 */
 	for (ct = cache->mfc_un.res.maxvif-1; ct >= cache->mfc_un.res.minvif; ct--) {
-		if (skb->nh.iph->ttl > cache->mfc_un.res.ttls[ct]) {
+		if (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) {
 			if (psend != -1) {
 				struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
 				if (skb2)
@@ -1350,7 +1351,7 @@ int ip_mr_input(struct sk_buff *skb)
 		    if (IPCB(skb)->opt.router_alert) {
 			    if (ip_call_ra_chain(skb))
 				    return 0;
-		    } else if (skb->nh.iph->protocol == IPPROTO_IGMP){
+		    } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP){
 			    /* IGMPv1 (and broken IGMPv2 implementations sort of
 			       Cisco IOS <= 11.2(8)) do not put router alert
 			       option to IGMP packets destined to routable
@@ -1369,7 +1370,7 @@ int ip_mr_input(struct sk_buff *skb)
 	}
 
 	read_lock(&mrt_lock);
-	cache = ipmr_cache_find(skb->nh.iph->saddr, skb->nh.iph->daddr);
+	cache = ipmr_cache_find(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
 
 	/*
 	 *	No usable cache entry
@@ -1580,6 +1581,7 @@ int ipmr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait)
 
 	if (cache==NULL) {
 		struct sk_buff *skb2;
+		struct iphdr *iph;
 		struct net_device *dev;
 		int vif;
 
@@ -1601,10 +1603,11 @@ int ipmr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait)
 
 		skb_push(skb2, sizeof(struct iphdr));
 		skb_reset_network_header(skb2);
-		skb2->nh.iph->ihl = sizeof(struct iphdr)>>2;
+		iph = ip_hdr(skb2);
-		skb2->nh.iph->saddr = rt->rt_src;
+		iph->ihl = sizeof(struct iphdr) >> 2;
-		skb2->nh.iph->daddr = rt->rt_dst;
+		iph->saddr = rt->rt_src;
-		skb2->nh.iph->version = 0;
+		iph->daddr = rt->rt_dst;
+		iph->version = 0;
 		err = ipmr_cache_unresolved(vif, skb2);
 		read_unlock(&mrt_lock);
 		return err;

net/ipv4/ipvs/ip_vs_app.c

@@ -577,7 +577,6 @@ static const struct file_operations ip_vs_app_fops = {
 int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri,
 		      char *o_buf, int o_len, char *n_buf, int n_len)
 {
-	struct iphdr *iph;
 	int diff;
 	int o_offset;
 	int o_left;
@@ -607,8 +606,7 @@ int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri,
 	}
 
 	/* must update the iph total length here */
-	iph = skb->nh.iph;
+	ip_hdr(skb)->tot_len = htons(skb->len);
-	iph->tot_len = htons(skb->len);
 
 	LeaveFunction(9);
 	return 0;

net/ipv4/ipvs/ip_vs_core.c

@@ -212,7 +212,7 @@ ip_vs_sched_persist(struct ip_vs_service *svc,
 		    __be16 ports[2])
 {
 	struct ip_vs_conn *cp = NULL;
-	struct iphdr *iph = skb->nh.iph;
+	struct iphdr *iph = ip_hdr(skb);
 	struct ip_vs_dest *dest;
 	struct ip_vs_conn *ct;
 	__be16  dport;	 /* destination port to forward */
@@ -381,7 +381,7 @@ struct ip_vs_conn *
 ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb)
 {
 	struct ip_vs_conn *cp = NULL;
-	struct iphdr *iph = skb->nh.iph;
+	struct iphdr *iph = ip_hdr(skb);
 	struct ip_vs_dest *dest;
 	__be16 _ports[2], *pptr;
 
@@ -447,7 +447,7 @@ int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
 		struct ip_vs_protocol *pp)
 {
 	__be16 _ports[2], *pptr;
-	struct iphdr *iph = skb->nh.iph;
+	struct iphdr *iph = ip_hdr(skb);
 
 	pptr = skb_header_pointer(skb, iph->ihl*4,
 				  sizeof(_ports), _ports);
@@ -546,7 +546,7 @@ ip_vs_gather_frags(struct sk_buff *skb, u_int32_t user)
 {
 	skb = ip_defrag(skb, user);
 	if (skb)
-		ip_send_check(skb->nh.iph);
+		ip_send_check(ip_hdr(skb));
 	return skb;
 }
 
@@ -557,7 +557,7 @@ ip_vs_gather_frags(struct sk_buff *skb, u_int32_t user)
 void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
 		    struct ip_vs_conn *cp, int inout)
 {
-	struct iphdr *iph	 = skb->nh.iph;
+	struct iphdr *iph	 = ip_hdr(skb);
 	unsigned int icmp_offset = iph->ihl*4;
 	struct icmphdr *icmph	 = (struct icmphdr *)(skb_network_header(skb) +
 						      icmp_offset);
@@ -618,14 +618,14 @@ static int ip_vs_out_icmp(struct sk_buff **pskb, int *related)
 	*related = 1;
 
 	/* reassemble IP fragments */
-	if (skb->nh.iph->frag_off & htons(IP_MF|IP_OFFSET)) {
+	if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) {
 		skb = ip_vs_gather_frags(skb, IP_DEFRAG_VS_OUT);
 		if (!skb)
 			return NF_STOLEN;
 		*pskb = skb;
 	}
 
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 	offset = ihl = iph->ihl * 4;
 	ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph);
 	if (ic == NULL)
@@ -740,14 +740,14 @@ ip_vs_out(unsigned int hooknum, struct sk_buff **pskb,
 	if (skb->ipvs_property)
 		return NF_ACCEPT;
 
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 	if (unlikely(iph->protocol == IPPROTO_ICMP)) {
 		int related, verdict = ip_vs_out_icmp(pskb, &related);
 
 		if (related)
 			return verdict;
 		skb = *pskb;
-		iph = skb->nh.iph;
+		iph = ip_hdr(skb);
 	}
 
 	pp = ip_vs_proto_get(iph->protocol);
@@ -760,7 +760,7 @@ ip_vs_out(unsigned int hooknum, struct sk_buff **pskb,
 		skb = ip_vs_gather_frags(skb, IP_DEFRAG_VS_OUT);
 		if (!skb)
 			return NF_STOLEN;
-		iph = skb->nh.iph;
+		iph = ip_hdr(skb);
 		*pskb = skb;
 	}
 
@@ -810,8 +810,8 @@ ip_vs_out(unsigned int hooknum, struct sk_buff **pskb,
 	if (pp->snat_handler && !pp->snat_handler(pskb, pp, cp))
 		goto drop;
 	skb = *pskb;
-	skb->nh.iph->saddr = cp->vaddr;
+	ip_hdr(skb)->saddr = cp->vaddr;
-	ip_send_check(skb->nh.iph);
+	ip_send_check(ip_hdr(skb));
 
 	/* For policy routing, packets originating from this
 	 * machine itself may be routed differently to packets
@@ -861,7 +861,7 @@ ip_vs_in_icmp(struct sk_buff **pskb, int *related, unsigned int hooknum)
 	*related = 1;
 
 	/* reassemble IP fragments */
-	if (skb->nh.iph->frag_off & htons(IP_MF|IP_OFFSET)) {
+	if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) {
 		skb = ip_vs_gather_frags(skb,
 					 hooknum == NF_IP_LOCAL_IN ?
 					 IP_DEFRAG_VS_IN : IP_DEFRAG_VS_FWD);
@@ -870,7 +870,7 @@ ip_vs_in_icmp(struct sk_buff **pskb, int *related, unsigned int hooknum)
 		*pskb = skb;
 	}
 
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 	offset = ihl = iph->ihl * 4;
 	ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph);
 	if (ic == NULL)
@@ -966,19 +966,19 @@ ip_vs_in(unsigned int hooknum, struct sk_buff **pskb,
 		     || skb->dev == &loopback_dev || skb->sk)) {
 		IP_VS_DBG(12, "packet type=%d proto=%d daddr=%d.%d.%d.%d ignored\n",
 			  skb->pkt_type,
-			  skb->nh.iph->protocol,
+			  ip_hdr(skb)->protocol,
-			  NIPQUAD(skb->nh.iph->daddr));
+			  NIPQUAD(ip_hdr(skb)->daddr));
 		return NF_ACCEPT;
 	}
 
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 	if (unlikely(iph->protocol == IPPROTO_ICMP)) {
 		int related, verdict = ip_vs_in_icmp(pskb, &related, hooknum);
 
 		if (related)
 			return verdict;
 		skb = *pskb;
-		iph = skb->nh.iph;
+		iph = ip_hdr(skb);
 	}
 
 	/* Protocol supported? */
@@ -1064,7 +1064,7 @@ ip_vs_forward_icmp(unsigned int hooknum, struct sk_buff **pskb,
 {
 	int r;
 
-	if ((*pskb)->nh.iph->protocol != IPPROTO_ICMP)
+	if (ip_hdr(*pskb)->protocol != IPPROTO_ICMP)
 		return NF_ACCEPT;
 
 	return ip_vs_in_icmp(pskb, &r, hooknum);

net/ipv4/ipvs/ip_vs_dh.c

@@ -204,7 +204,7 @@ ip_vs_dh_schedule(struct ip_vs_service *svc, const struct sk_buff *skb)
 {
 	struct ip_vs_dest *dest;
 	struct ip_vs_dh_bucket *tbl;
-	struct iphdr *iph = skb->nh.iph;
+	struct iphdr *iph = ip_hdr(skb);
 
 	IP_VS_DBG(6, "ip_vs_dh_schedule(): Scheduling...\n");
 

net/ipv4/ipvs/ip_vs_ftp.c

@@ -159,7 +159,7 @@ static int ip_vs_ftp_out(struct ip_vs_app *app, struct ip_vs_conn *cp,
 		return 0;
 
 	if (cp->app_data == &ip_vs_ftp_pasv) {
-		iph = (*pskb)->nh.iph;
+		iph = ip_hdr(*pskb);
 		th = (struct tcphdr *)&(((char *)iph)[iph->ihl*4]);
 		data = (char *)th + (th->doff << 2);
 		data_limit = (*pskb)->tail;
@@ -262,7 +262,7 @@ static int ip_vs_ftp_in(struct ip_vs_app *app, struct ip_vs_conn *cp,
 	/*
 	 * Detecting whether it is passive
 	 */
-	iph = (*pskb)->nh.iph;
+	iph = ip_hdr(*pskb);
 	th = (struct tcphdr *)&(((char *)iph)[iph->ihl*4]);
 
 	/* Since there may be OPTIONS in the TCP packet and the HLEN is

net/ipv4/ipvs/ip_vs_lblc.c

@@ -521,7 +521,7 @@ ip_vs_lblc_schedule(struct ip_vs_service *svc, const struct sk_buff *skb)
 	struct ip_vs_dest *dest;
 	struct ip_vs_lblc_table *tbl;
 	struct ip_vs_lblc_entry *en;
-	struct iphdr *iph = skb->nh.iph;
+	struct iphdr *iph = ip_hdr(skb);
 
 	IP_VS_DBG(6, "ip_vs_lblc_schedule(): Scheduling...\n");
 

net/ipv4/ipvs/ip_vs_lblcr.c

@@ -775,7 +775,7 @@ ip_vs_lblcr_schedule(struct ip_vs_service *svc, const struct sk_buff *skb)
 	struct ip_vs_dest *dest;
 	struct ip_vs_lblcr_table *tbl;
 	struct ip_vs_lblcr_entry *en;
-	struct iphdr *iph = skb->nh.iph;
+	struct iphdr *iph = ip_hdr(skb);
 
 	IP_VS_DBG(6, "ip_vs_lblcr_schedule(): Scheduling...\n");
 

net/ipv4/ipvs/ip_vs_proto_tcp.c

@@ -83,8 +83,8 @@ tcp_conn_schedule(struct sk_buff *skb,
 	}
 
 	if (th->syn &&
-	    (svc = ip_vs_service_get(skb->mark, skb->nh.iph->protocol,
+	    (svc = ip_vs_service_get(skb->mark, ip_hdr(skb)->protocol,
-				     skb->nh.iph->daddr, th->dest))) {
+				     ip_hdr(skb)->daddr, th->dest))) {
 		if (ip_vs_todrop()) {
 			/*
 			 * It seems that we are very loaded.
@@ -142,7 +142,7 @@ tcp_snat_handler(struct sk_buff **pskb,
 			return 0;
 	}
 
-	tcph = (void *)(*pskb)->nh.iph + tcphoff;
+	tcph = (void *)ip_hdr(*pskb) + tcphoff;
 	tcph->source = cp->vport;
 
 	/* Adjust TCP checksums */
@@ -193,7 +193,7 @@ tcp_dnat_handler(struct sk_buff **pskb,
 			return 0;
 	}
 
-	tcph = (void *)(*pskb)->nh.iph + tcphoff;
+	tcph = (void *)ip_hdr(*pskb) + tcphoff;
 	tcph->dest = cp->dport;
 
 	/*
@@ -229,9 +229,9 @@ tcp_csum_check(struct sk_buff *skb, struct ip_vs_protocol *pp)
 	case CHECKSUM_NONE:
 		skb->csum = skb_checksum(skb, tcphoff, skb->len - tcphoff, 0);
 	case CHECKSUM_COMPLETE:
-		if (csum_tcpudp_magic(skb->nh.iph->saddr, skb->nh.iph->daddr,
+		if (csum_tcpudp_magic(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
 				      skb->len - tcphoff,
-				      skb->nh.iph->protocol, skb->csum)) {
+				      ip_hdr(skb)->protocol, skb->csum)) {
 			IP_VS_DBG_RL_PKT(0, pp, skb, 0,
 					 "Failed checksum for");
 			return 0;

net/ipv4/ipvs/ip_vs_proto_udp.c

@@ -89,8 +89,8 @@ udp_conn_schedule(struct sk_buff *skb, struct ip_vs_protocol *pp,
 		return 0;
 	}
 
-	if ((svc = ip_vs_service_get(skb->mark, skb->nh.iph->protocol,
+	if ((svc = ip_vs_service_get(skb->mark, ip_hdr(skb)->protocol,
-				     skb->nh.iph->daddr, uh->dest))) {
+				     ip_hdr(skb)->daddr, uh->dest))) {
 		if (ip_vs_todrop()) {
 			/*
 			 * It seems that we are very loaded.
@@ -151,7 +151,7 @@ udp_snat_handler(struct sk_buff **pskb,
 			return 0;
 	}
 
-	udph = (void *)(*pskb)->nh.iph + udphoff;
+	udph = (void *)ip_hdr(*pskb) + udphoff;
 	udph->source = cp->vport;
 
 	/*
@@ -206,7 +206,7 @@ udp_dnat_handler(struct sk_buff **pskb,
 			return 0;
 	}
 
-	udph = (void *)(*pskb)->nh.iph + udphoff;
+	udph = (void *)ip_hdr(*pskb) + udphoff;
 	udph->dest = cp->dport;
 
 	/*
@@ -251,10 +251,10 @@ udp_csum_check(struct sk_buff *skb, struct ip_vs_protocol *pp)
 			skb->csum = skb_checksum(skb, udphoff,
 						 skb->len - udphoff, 0);
 		case CHECKSUM_COMPLETE:
-			if (csum_tcpudp_magic(skb->nh.iph->saddr,
+			if (csum_tcpudp_magic(ip_hdr(skb)->saddr,
-					      skb->nh.iph->daddr,
+					      ip_hdr(skb)->daddr,
 					      skb->len - udphoff,
-					      skb->nh.iph->protocol,
+					      ip_hdr(skb)->protocol,
 					      skb->csum)) {
 				IP_VS_DBG_RL_PKT(0, pp, skb, 0,
 						 "Failed checksum for");

net/ipv4/ipvs/ip_vs_sh.c

@@ -201,7 +201,7 @@ ip_vs_sh_schedule(struct ip_vs_service *svc, const struct sk_buff *skb)
 {
 	struct ip_vs_dest *dest;
 	struct ip_vs_sh_bucket *tbl;
-	struct iphdr *iph = skb->nh.iph;
+	struct iphdr *iph = ip_hdr(skb);
 
 	IP_VS_DBG(6, "ip_vs_sh_schedule(): Scheduling...\n");
 

net/ipv4/ipvs/ip_vs_xmit.c

@@ -156,7 +156,7 @@ ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 		  struct ip_vs_protocol *pp)
 {
 	struct rtable *rt;			/* Route to the other host */
-	struct iphdr  *iph = skb->nh.iph;
+	struct iphdr  *iph = ip_hdr(skb);
 	u8     tos = iph->tos;
 	int    mtu;
 	struct flowi fl = {
@@ -193,7 +193,7 @@ ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 		ip_rt_put(rt);
 		return NF_STOLEN;
 	}
-	ip_send_check(skb->nh.iph);
+	ip_send_check(ip_hdr(skb));
 
 	/* drop old route */
 	dst_release(skb->dst);
@@ -226,7 +226,7 @@ ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 {
 	struct rtable *rt;		/* Route to the other host */
 	int mtu;
-	struct iphdr *iph = skb->nh.iph;
+	struct iphdr *iph = ip_hdr(skb);
 
 	EnterFunction(10);
 
@@ -266,8 +266,8 @@ ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 	/* mangle the packet */
 	if (pp->dnat_handler && !pp->dnat_handler(&skb, pp, cp))
 		goto tx_error;
-	skb->nh.iph->daddr = cp->daddr;
+	ip_hdr(skb)->daddr = cp->daddr;
-	ip_send_check(skb->nh.iph);
+	ip_send_check(ip_hdr(skb));
 
 	IP_VS_DBG_PKT(10, pp, skb, 0, "After DNAT");
 
@@ -320,7 +320,7 @@ ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 {
 	struct rtable *rt;			/* Route to the other host */
 	struct net_device *tdev;		/* Device to other host */
-	struct iphdr  *old_iph = skb->nh.iph;
+	struct iphdr  *old_iph = ip_hdr(skb);
 	u8     tos = old_iph->tos;
 	__be16 df = old_iph->frag_off;
 	struct iphdr  *iph;			/* Our new IP header */
@@ -377,7 +377,7 @@ ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 		}
 		kfree_skb(skb);
 		skb = new_skb;
-		old_iph = skb->nh.iph;
+		old_iph = ip_hdr(skb);
 	}
 
 	skb->h.raw = (void *) old_iph;
@@ -396,7 +396,7 @@ ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 	/*
 	 *	Push down and install the IPIP header.
 	 */
-	iph			=	skb->nh.iph;
+	iph			=	ip_hdr(skb);
 	iph->version		=	4;
 	iph->ihl		=	sizeof(struct iphdr)>>2;
 	iph->frag_off		=	df;
@@ -436,7 +436,7 @@ ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 	      struct ip_vs_protocol *pp)
 {
 	struct rtable *rt;			/* Route to the other host */
-	struct iphdr  *iph = skb->nh.iph;
+	struct iphdr  *iph = ip_hdr(skb);
 	int    mtu;
 
 	EnterFunction(10);
@@ -461,7 +461,7 @@ ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 		ip_rt_put(rt);
 		return NF_STOLEN;
 	}
-	ip_send_check(skb->nh.iph);
+	ip_send_check(ip_hdr(skb));
 
 	/* drop old route */
 	dst_release(skb->dst);
@@ -515,12 +515,12 @@ ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 	 * mangle and send the packet here (only for VS/NAT)
 	 */
 
-	if (!(rt = __ip_vs_get_out_rt(cp, RT_TOS(skb->nh.iph->tos))))
+	if (!(rt = __ip_vs_get_out_rt(cp, RT_TOS(ip_hdr(skb)->tos))))
 		goto tx_error_icmp;
 
 	/* MTU checking */
 	mtu = dst_mtu(&rt->u.dst);
-	if ((skb->len > mtu) && (skb->nh.iph->frag_off & htons(IP_DF))) {
+	if ((skb->len > mtu) && (ip_hdr(skb)->frag_off & htons(IP_DF))) {
 		ip_rt_put(rt);
 		icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
 		IP_VS_DBG_RL("ip_vs_in_icmp(): frag needed\n");

net/ipv4/netfilter.c

@@ -10,7 +10,7 @@
 /* route_me_harder function, used by iptable_nat, iptable_mangle + ip_queue */
 int ip_route_me_harder(struct sk_buff **pskb, unsigned addr_type)
 {
-	struct iphdr *iph = (*pskb)->nh.iph;
+	const struct iphdr *iph = ip_hdr(*pskb);
 	struct rtable *rt;
 	struct flowi fl = {};
 	struct dst_entry *odst;
@@ -142,7 +142,7 @@ static void nf_ip_saveroute(const struct sk_buff *skb, struct nf_info *info)
 	struct ip_rt_info *rt_info = nf_info_reroute(info);
 
 	if (info->hook == NF_IP_LOCAL_OUT) {
-		const struct iphdr *iph = skb->nh.iph;
+		const struct iphdr *iph = ip_hdr(skb);
 
 		rt_info->tos = iph->tos;
 		rt_info->daddr = iph->daddr;
@@ -155,7 +155,7 @@ static int nf_ip_reroute(struct sk_buff **pskb, const struct nf_info *info)
 	const struct ip_rt_info *rt_info = nf_info_reroute(info);
 
 	if (info->hook == NF_IP_LOCAL_OUT) {
-		struct iphdr *iph = (*pskb)->nh.iph;
+		const struct iphdr *iph = ip_hdr(*pskb);
 
 		if (!(iph->tos == rt_info->tos
 		      && iph->daddr == rt_info->daddr
@@ -168,7 +168,7 @@ static int nf_ip_reroute(struct sk_buff **pskb, const struct nf_info *info)
 __sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
 			    unsigned int dataoff, u_int8_t protocol)
 {
-	struct iphdr *iph = skb->nh.iph;
+	const struct iphdr *iph = ip_hdr(skb);
 	__sum16 csum = 0;
 
 	switch (skb->ip_summed) {

net/ipv4/netfilter/ip_conntrack_core.c

@@ -748,9 +748,9 @@ resolve_normal_ct(struct sk_buff *skb,
 	struct ip_conntrack_tuple_hash *h;
 	struct ip_conntrack *ct;
 
-	IP_NF_ASSERT((skb->nh.iph->frag_off & htons(IP_OFFSET)) == 0);
+	IP_NF_ASSERT((ip_hdr(skb)->frag_off & htons(IP_OFFSET)) == 0);
 
-	if (!ip_ct_get_tuple(skb->nh.iph, skb, ip_hdrlen(skb), &tuple,proto))
+	if (!ip_ct_get_tuple(ip_hdr(skb), skb, ip_hdrlen(skb), &tuple,proto))
 		return NULL;
 
 	/* look for tuple match */
@@ -811,10 +811,10 @@ unsigned int ip_conntrack_in(unsigned int hooknum,
 	}
 
 	/* Never happen */
-	if ((*pskb)->nh.iph->frag_off & htons(IP_OFFSET)) {
+	if (ip_hdr(*pskb)->frag_off & htons(IP_OFFSET)) {
 		if (net_ratelimit()) {
 		printk(KERN_ERR "ip_conntrack_in: Frag of proto %u (hook=%u)\n",
-		       (*pskb)->nh.iph->protocol, hooknum);
+		       ip_hdr(*pskb)->protocol, hooknum);
 		}
 		return NF_DROP;
 	}
@@ -825,17 +825,17 @@ unsigned int ip_conntrack_in(unsigned int hooknum,
 	if ((*pskb)->pkt_type == PACKET_BROADCAST) {
 		printk("Broadcast packet!\n");
 		return NF_ACCEPT;
-	} else if (((*pskb)->nh.iph->daddr & htonl(0x000000FF))
+	} else if ((ip_hdr(*pskb)->daddr & htonl(0x000000FF))
 		   == htonl(0x000000FF)) {
 		printk("Should bcast: %u.%u.%u.%u->%u.%u.%u.%u (sk=%p, ptype=%u)\n",
-		       NIPQUAD((*pskb)->nh.iph->saddr),
+		       NIPQUAD(ip_hdr(*pskb)->saddr),
-		       NIPQUAD((*pskb)->nh.iph->daddr),
+		       NIPQUAD(ip_hdr(*pskb)->daddr),
 		       (*pskb)->sk, (*pskb)->pkt_type);
 	}
 #endif
 
 	/* rcu_read_lock()ed by nf_hook_slow */
-	proto = __ip_conntrack_proto_find((*pskb)->nh.iph->protocol);
+	proto = __ip_conntrack_proto_find(ip_hdr(*pskb)->protocol);
 
 	/* It may be an special packet, error, unclean...
 	 * inverse of the return code tells to the netfilter
@@ -1152,7 +1152,7 @@ void __ip_ct_refresh_acct(struct ip_conntrack *ct,
 	if (do_acct) {
 		ct->counters[CTINFO2DIR(ctinfo)].packets++;
 		ct->counters[CTINFO2DIR(ctinfo)].bytes +=
-						ntohs(skb->nh.iph->tot_len);
+						ntohs(ip_hdr(skb)->tot_len);
 		if ((ct->counters[CTINFO2DIR(ctinfo)].packets & 0x80000000)
 		    || (ct->counters[CTINFO2DIR(ctinfo)].bytes & 0x80000000))
 			event |= IPCT_COUNTER_FILLING;
@@ -1210,7 +1210,7 @@ ip_ct_gather_frags(struct sk_buff *skb, u_int32_t user)
 	local_bh_enable();
 
 	if (skb)
-		ip_send_check(skb->nh.iph);
+		ip_send_check(ip_hdr(skb));
 	return skb;
 }
 

net/ipv4/netfilter/ip_conntrack_helper_h323.c

@@ -576,8 +576,8 @@ static int h245_help(struct sk_buff **pskb, struct ip_conntrack *ct,
 	/* Process each TPKT */
 	while (get_tpkt_data(pskb, ct, ctinfo, &data, &datalen, &dataoff)) {
 		DEBUGP("ip_ct_h245: TPKT %u.%u.%u.%u->%u.%u.%u.%u, len=%d\n",
-		       NIPQUAD((*pskb)->nh.iph->saddr),
+		       NIPQUAD(ip_hdr(*pskb)->saddr),
-		       NIPQUAD((*pskb)->nh.iph->daddr), datalen);
+		       NIPQUAD(ip_hdr(*pskb)->daddr), datalen);
 
 		/* Decode H.245 signal */
 		ret = DecodeMultimediaSystemControlMessage(data, datalen,
@@ -1128,8 +1128,8 @@ static int q931_help(struct sk_buff **pskb, struct ip_conntrack *ct,
 	/* Process each TPKT */
 	while (get_tpkt_data(pskb, ct, ctinfo, &data, &datalen, &dataoff)) {
 		DEBUGP("ip_ct_q931: TPKT %u.%u.%u.%u->%u.%u.%u.%u, len=%d\n",
-		       NIPQUAD((*pskb)->nh.iph->saddr),
+		       NIPQUAD(ip_hdr(*pskb)->saddr),
-		       NIPQUAD((*pskb)->nh.iph->daddr), datalen);
+		       NIPQUAD(ip_hdr(*pskb)->daddr), datalen);
 
 		/* Decode Q.931 signal */
 		ret = DecodeQ931(data, datalen, &q931);
@@ -1741,8 +1741,8 @@ static int ras_help(struct sk_buff **pskb, struct ip_conntrack *ct,
 	if (data == NULL)
 		goto accept;
 	DEBUGP("ip_ct_ras: RAS message %u.%u.%u.%u->%u.%u.%u.%u, len=%d\n",
-	       NIPQUAD((*pskb)->nh.iph->saddr),
+	       NIPQUAD(ip_hdr(*pskb)->saddr),
-	       NIPQUAD((*pskb)->nh.iph->daddr), datalen);
+	       NIPQUAD(ip_hdr(*pskb)->daddr), datalen);
 
 	/* Decode RAS message */
 	ret = DecodeRasMessage(data, datalen, &ras);

net/ipv4/netfilter/ip_conntrack_netbios_ns.c

@@ -45,7 +45,7 @@ static int help(struct sk_buff **pskb,
 		struct ip_conntrack *ct, enum ip_conntrack_info ctinfo)
 {
 	struct ip_conntrack_expect *exp;
-	struct iphdr *iph = (*pskb)->nh.iph;
+	struct iphdr *iph = ip_hdr(*pskb);
 	struct rtable *rt = (struct rtable *)(*pskb)->dst;
 	struct in_device *in_dev;
 	__be32 mask = 0;

net/ipv4/netfilter/ip_conntrack_proto_sctp.c

@@ -316,7 +316,7 @@ static int sctp_packet(struct ip_conntrack *conntrack,
 		       enum ip_conntrack_info ctinfo)
 {
 	enum sctp_conntrack newconntrack, oldsctpstate;
-	struct iphdr *iph = skb->nh.iph;
+	struct iphdr *iph = ip_hdr(skb);
 	sctp_sctphdr_t _sctph, *sh;
 	sctp_chunkhdr_t _sch, *sch;
 	u_int32_t offset, count;
@@ -430,7 +430,7 @@ static int sctp_new(struct ip_conntrack *conntrack,
 		    const struct sk_buff *skb)
 {
 	enum sctp_conntrack newconntrack;
-	struct iphdr *iph = skb->nh.iph;
+	struct iphdr *iph = ip_hdr(skb);
 	sctp_sctphdr_t _sctph, *sh;
 	sctp_chunkhdr_t _sch, *sch;
 	u_int32_t offset, count;

net/ipv4/netfilter/ip_conntrack_proto_tcp.c

@@ -770,8 +770,8 @@ void ip_conntrack_tcp_update(struct sk_buff *skb,
 			     struct ip_conntrack *conntrack,
 			     enum ip_conntrack_dir dir)
 {
-	struct iphdr *iph = skb->nh.iph;
+	struct iphdr *iph = ip_hdr(skb);
-	struct tcphdr *tcph = (void *)skb->nh.iph + ip_hdrlen(skb);
+	struct tcphdr *tcph = (void *)iph + ip_hdrlen(skb);
 	__u32 end;
 #ifdef DEBUGP_VARS
 	struct ip_ct_tcp_state *sender = &conntrack->proto.tcp.seen[dir];
@@ -834,13 +834,13 @@ static int tcp_error(struct sk_buff *skb,
 		     enum ip_conntrack_info *ctinfo,
 		     unsigned int hooknum)
 {
-	struct iphdr *iph = skb->nh.iph;
+	const unsigned int hdrlen = ip_hdrlen(skb);
 	struct tcphdr _tcph, *th;
-	unsigned int tcplen = skb->len - iph->ihl * 4;
+	unsigned int tcplen = skb->len - hdrlen;
 	u_int8_t tcpflags;
 
 	/* Smaller that minimal TCP header? */
-	th = skb_header_pointer(skb, iph->ihl * 4,
+	th = skb_header_pointer(skb, hdrlen,
 				sizeof(_tcph), &_tcph);
 	if (th == NULL) {
 		if (LOG_INVALID(IPPROTO_TCP))
@@ -863,7 +863,7 @@ static int tcp_error(struct sk_buff *skb,
 	 */
 	/* FIXME: Source route IP option packets --RR */
 	if (ip_conntrack_checksum && hooknum == NF_IP_PRE_ROUTING &&
-	    nf_ip_checksum(skb, hooknum, iph->ihl * 4, IPPROTO_TCP)) {
+	    nf_ip_checksum(skb, hooknum, hdrlen, IPPROTO_TCP)) {
 		if (LOG_INVALID(IPPROTO_TCP))
 			nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
 				  "ip_ct_tcp: bad TCP checksum ");
@@ -889,7 +889,7 @@ static int tcp_packet(struct ip_conntrack *conntrack,
 {
 	enum tcp_conntrack new_state, old_state;
 	enum ip_conntrack_dir dir;
-	struct iphdr *iph = skb->nh.iph;
+	struct iphdr *iph = ip_hdr(skb);
 	struct tcphdr *th, _tcph;
 	unsigned long timeout;
 	unsigned int index;
@@ -1062,7 +1062,7 @@ static int tcp_new(struct ip_conntrack *conntrack,
 		   const struct sk_buff *skb)
 {
 	enum tcp_conntrack new_state;
-	struct iphdr *iph = skb->nh.iph;
+	struct iphdr *iph = ip_hdr(skb);
 	struct tcphdr *th, _tcph;
 #ifdef DEBUGP_VARS
 	struct ip_ct_tcp_state *sender = &conntrack->proto.tcp.seen[0];

net/ipv4/netfilter/ip_conntrack_proto_udp.c

@@ -89,12 +89,12 @@ static int udp_new(struct ip_conntrack *conntrack, const struct sk_buff *skb)
 static int udp_error(struct sk_buff *skb, enum ip_conntrack_info *ctinfo,
 		     unsigned int hooknum)
 {
-	struct iphdr *iph = skb->nh.iph;
+	const unsigned int hdrlen = ip_hdrlen(skb);
-	unsigned int udplen = skb->len - iph->ihl * 4;
+	unsigned int udplen = skb->len - hdrlen;
 	struct udphdr _hdr, *hdr;
 
 	/* Header is too small? */
-	hdr = skb_header_pointer(skb, iph->ihl*4, sizeof(_hdr), &_hdr);
+	hdr = skb_header_pointer(skb, hdrlen, sizeof(_hdr), &_hdr);
 	if (hdr == NULL) {
 		if (LOG_INVALID(IPPROTO_UDP))
 			nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
@@ -119,7 +119,7 @@ static int udp_error(struct sk_buff *skb, enum ip_conntrack_info *ctinfo,
 	 * because the checksum is assumed to be correct.
 	 * FIXME: Source route IP option packets --RR */
 	if (ip_conntrack_checksum && hooknum == NF_IP_PRE_ROUTING &&
-	    nf_ip_checksum(skb, hooknum, iph->ihl * 4, IPPROTO_UDP)) {
+	    nf_ip_checksum(skb, hooknum, hdrlen, IPPROTO_UDP)) {
 		if (LOG_INVALID(IPPROTO_UDP))
 			nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
 				  "ip_ct_udp: bad UDP checksum ");

net/ipv4/netfilter/ip_conntrack_standalone.c

@@ -439,7 +439,7 @@ static unsigned int ip_conntrack_defrag(unsigned int hooknum,
 #endif
 
 	/* Gather fragments. */
-	if ((*pskb)->nh.iph->frag_off & htons(IP_MF|IP_OFFSET)) {
+	if (ip_hdr(*pskb)->frag_off & htons(IP_MF | IP_OFFSET)) {
 		*pskb = ip_ct_gather_frags(*pskb,
 					   hooknum == NF_IP_PRE_ROUTING ?
 					   IP_DEFRAG_CONNTRACK_IN :

net/ipv4/netfilter/ip_nat_helper.c

@@ -94,7 +94,7 @@ static void mangle_contents(struct sk_buff *skb,
 	unsigned char *data;
 
 	BUG_ON(skb_is_nonlinear(skb));
-	data = (unsigned char *)skb->nh.iph + dataoff;
+	data = skb_network_header(skb) + dataoff;
 
 	/* move post-replacement */
 	memmove(data + match_offset + rep_len,
@@ -118,8 +118,8 @@ static void mangle_contents(struct sk_buff *skb,
 	}
 
 	/* fix IP hdr checksum information */
-	skb->nh.iph->tot_len = htons(skb->len);
+	ip_hdr(skb)->tot_len = htons(skb->len);
-	ip_send_check(skb->nh.iph);
+	ip_send_check(ip_hdr(skb));
 }
 
 /* Unusual, but possible case. */
@@ -173,7 +173,7 @@ ip_nat_mangle_tcp_packet(struct sk_buff **pskb,
 
 	SKB_LINEAR_ASSERT(*pskb);
 
-	iph = (*pskb)->nh.iph;
+	iph = ip_hdr(*pskb);
 	tcph = (void *)iph + iph->ihl*4;
 
 	oldlen = (*pskb)->len - iph->ihl*4;
@@ -227,7 +227,7 @@ ip_nat_mangle_udp_packet(struct sk_buff **pskb,
 	int datalen, oldlen;
 
 	/* UDP helpers might accidentally mangle the wrong packet */
-	iph = (*pskb)->nh.iph;
+	iph = ip_hdr(*pskb);
 	if ((*pskb)->len < iph->ihl*4 + sizeof(*udph) +
 			       match_offset + match_len)
 		return 0;
@@ -240,7 +240,7 @@ ip_nat_mangle_udp_packet(struct sk_buff **pskb,
 	    && !enlarge_skb(pskb, rep_len - match_len))
 		return 0;
 
-	iph = (*pskb)->nh.iph;
+	iph = ip_hdr(*pskb);
 	udph = (void *)iph + iph->ihl*4;
 
 	oldlen = (*pskb)->len - iph->ihl*4;

net/ipv4/netfilter/ip_nat_helper_h323.c

@@ -46,7 +46,7 @@ static int set_addr(struct sk_buff **pskb,
 	buf.port = htons(port);
 	addroff += dataoff;
 
-	if ((*pskb)->nh.iph->protocol == IPPROTO_TCP) {
+	if (ip_hdr(*pskb)->protocol == IPPROTO_TCP) {
 		if (!ip_nat_mangle_tcp_packet(pskb, ct, ctinfo,
 					      addroff, sizeof(buf),
 					      (char *) &buf, sizeof(buf))) {

net/ipv4/netfilter/ip_nat_rule.c

@@ -158,7 +158,7 @@ static unsigned int ipt_dnat_target(struct sk_buff **pskb,
 
 	if (hooknum == NF_IP_LOCAL_OUT
 	    && mr->range[0].flags & IP_NAT_RANGE_MAP_IPS)
-		warn_if_extra_mangle((*pskb)->nh.iph->daddr,
+		warn_if_extra_mangle(ip_hdr(*pskb)->daddr,
 				     mr->range[0].min_ip);
 
 	return ip_nat_setup_info(ct, &mr->range[0], hooknum);

net/ipv4/netfilter/ip_nat_snmp_basic.c

@@ -1193,7 +1193,7 @@ static int snmp_translate(struct ip_conntrack *ct,
 			  enum ip_conntrack_info ctinfo,
 			  struct sk_buff **pskb)
 {
-	struct iphdr *iph = (*pskb)->nh.iph;
+	struct iphdr *iph = ip_hdr(*pskb);
 	struct udphdr *udph = (struct udphdr *)((__be32 *)iph + iph->ihl);
 	u_int16_t udplen = ntohs(udph->len);
 	u_int16_t paylen = udplen - sizeof(struct udphdr);
@@ -1234,7 +1234,7 @@ static int help(struct sk_buff **pskb,
 {
 	int dir = CTINFO2DIR(ctinfo);
 	unsigned int ret;
-	struct iphdr *iph = (*pskb)->nh.iph;
+	struct iphdr *iph = ip_hdr(*pskb);
 	struct udphdr *udph = (struct udphdr *)((u_int32_t *)iph + iph->ihl);
 
 	/* SNMP replies and originating SNMP traps get mangled */

net/ipv4/netfilter/ip_nat_standalone.c

@@ -97,7 +97,7 @@ ip_nat_fn(unsigned int hooknum,
 
 	/* We never see fragments: conntrack defrags on pre-routing
 	   and local-out, and ip_nat_out protects post-routing. */
-	IP_NF_ASSERT(!((*pskb)->nh.iph->frag_off
+	IP_NF_ASSERT(!(ip_hdr(*pskb)->frag_off
 		       & htons(IP_MF|IP_OFFSET)));
 
 	ct = ip_conntrack_get(*pskb, &ctinfo);
@@ -109,7 +109,7 @@ ip_nat_fn(unsigned int hooknum,
 		/* Exception: ICMP redirect to new connection (not in
 		   hash table yet).  We must not let this through, in
 		   case we're doing NAT to the same network. */
-		if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP) {
+		if (ip_hdr(*pskb)->protocol == IPPROTO_ICMP) {
 			struct icmphdr _hdr, *hp;
 
 			hp = skb_header_pointer(*pskb, ip_hdrlen(*pskb),
@@ -128,7 +128,7 @@ ip_nat_fn(unsigned int hooknum,
 	switch (ctinfo) {
 	case IP_CT_RELATED:
 	case IP_CT_RELATED+IP_CT_IS_REPLY:
-		if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP) {
+		if (ip_hdr(*pskb)->protocol == IPPROTO_ICMP) {
 			if (!ip_nat_icmp_reply_translation(ct, ctinfo,
 							   hooknum, pskb))
 				return NF_DROP;
@@ -184,11 +184,11 @@ ip_nat_in(unsigned int hooknum,
 	  int (*okfn)(struct sk_buff *))
 {
 	unsigned int ret;
-	__be32 daddr = (*pskb)->nh.iph->daddr;
+	__be32 daddr = ip_hdr(*pskb)->daddr;
 
 	ret = ip_nat_fn(hooknum, pskb, in, out, okfn);
 	if (ret != NF_DROP && ret != NF_STOLEN
-	    && daddr != (*pskb)->nh.iph->daddr) {
+	    && daddr != ip_hdr(*pskb)->daddr) {
 		dst_release((*pskb)->dst);
 		(*pskb)->dst = NULL;
 	}

net/ipv4/netfilter/ip_tables.c

@@ -231,7 +231,7 @@ ipt_do_table(struct sk_buff **pskb,
 	struct xt_table_info *private;
 
 	/* Initialization */
-	ip = (*pskb)->nh.iph;
+	ip = ip_hdr(*pskb);
 	datalen = (*pskb)->len - ip->ihl * 4;
 	indev = in ? in->name : nulldevname;
 	outdev = out ? out->name : nulldevname;
@@ -320,7 +320,7 @@ ipt_do_table(struct sk_buff **pskb,
 					= 0x57acc001;
 #endif
 				/* Target might have changed stuff. */
-				ip = (*pskb)->nh.iph;
+				ip = ip_hdr(*pskb);
 				datalen = (*pskb)->len - ip->ihl * 4;
 
 				if (verdict == IPT_CONTINUE)

net/ipv4/netfilter/ipt_CLUSTERIP.c

@@ -240,7 +240,7 @@ clusterip_del_node(struct clusterip_config *c, u_int16_t nodenum)
 static inline u_int32_t
 clusterip_hashfn(struct sk_buff *skb, struct clusterip_config *config)
 {
-	struct iphdr *iph = skb->nh.iph;
+	struct iphdr *iph = ip_hdr(skb);
 	unsigned long hashval;
 	u_int16_t sport, dport;
 	u_int16_t *ports;
@@ -328,7 +328,7 @@ target(struct sk_buff **pskb,
 
 	/* special case: ICMP error handling. conntrack distinguishes between
 	 * error messages (RELATED) and information requests (see below) */
-	if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP
+	if (ip_hdr(*pskb)->protocol == IPPROTO_ICMP
 	    && (ctinfo == IP_CT_RELATED
 		|| ctinfo == IP_CT_RELATED+IP_CT_IS_REPLY))
 		return XT_CONTINUE;

net/ipv4/netfilter/ipt_ECN.c

@@ -30,13 +30,13 @@ MODULE_DESCRIPTION("iptables ECN modification module");
 static inline int
 set_ect_ip(struct sk_buff **pskb, const struct ipt_ECN_info *einfo)
 {
-	struct iphdr *iph = (*pskb)->nh.iph;
+	struct iphdr *iph = ip_hdr(*pskb);
 
 	if ((iph->tos & IPT_ECN_IP_MASK) != (einfo->ip_ect & IPT_ECN_IP_MASK)) {
 		__u8 oldtos;
 		if (!skb_make_writable(pskb, sizeof(struct iphdr)))
 			return 0;
-		iph = (*pskb)->nh.iph;
+		iph = ip_hdr(*pskb);
 		oldtos = iph->tos;
 		iph->tos &= ~IPT_ECN_IP_MASK;
 		iph->tos |= (einfo->ip_ect & IPT_ECN_IP_MASK);
@@ -66,7 +66,7 @@ set_ect_tcp(struct sk_buff **pskb, const struct ipt_ECN_info *einfo)
 
 	if (!skb_make_writable(pskb, ip_hdrlen(*pskb) + sizeof(*tcph)))
 		return 0;
-	tcph = (void *)(*pskb)->nh.iph + ip_hdrlen(*pskb);
+	tcph = (void *)ip_hdr(*pskb) + ip_hdrlen(*pskb);
 
 	oldval = ((__be16 *)tcph)[6];
 	if (einfo->operation & IPT_ECN_OP_SET_ECE)
@@ -94,7 +94,7 @@ target(struct sk_buff **pskb,
 			return NF_DROP;
 
 	if (einfo->operation & (IPT_ECN_OP_SET_ECE | IPT_ECN_OP_SET_CWR)
-	    && (*pskb)->nh.iph->protocol == IPPROTO_TCP)
+	    && ip_hdr(*pskb)->protocol == IPPROTO_TCP)
 		if (!set_ect_tcp(pskb, einfo))
 			return NF_DROP;
 

net/ipv4/netfilter/ipt_NETMAP.c

@@ -75,9 +75,9 @@ target(struct sk_buff **pskb,
 	netmask = ~(mr->range[0].min_ip ^ mr->range[0].max_ip);
 
 	if (hooknum == NF_IP_PRE_ROUTING || hooknum == NF_IP_LOCAL_OUT)
-		new_ip = (*pskb)->nh.iph->daddr & ~netmask;
+		new_ip = ip_hdr(*pskb)->daddr & ~netmask;
 	else
-		new_ip = (*pskb)->nh.iph->saddr & ~netmask;
+		new_ip = ip_hdr(*pskb)->saddr & ~netmask;
 	new_ip |= mr->range[0].min_ip & netmask;
 
 	newrange = ((struct ip_nat_range)

net/ipv4/netfilter/ipt_REJECT.c

@@ -43,6 +43,7 @@ MODULE_DESCRIPTION("iptables REJECT target module");
 static void send_reset(struct sk_buff *oldskb, int hook)
 {
 	struct sk_buff *nskb;
+	struct iphdr *niph;
 	struct tcphdr _otcph, *oth, *tcph;
 	__be16 tmp_port;
 	__be32 tmp_addr;
@@ -50,7 +51,7 @@ static void send_reset(struct sk_buff *oldskb, int hook)
 	unsigned int addr_type;
 
 	/* IP header checks: fragment. */
-	if (oldskb->nh.iph->frag_off & htons(IP_OFFSET))
+	if (ip_hdr(oldskb)->frag_off & htons(IP_OFFSET))
 		return;
 
 	oth = skb_header_pointer(oldskb, ip_hdrlen(oldskb),
@@ -86,9 +87,10 @@ static void send_reset(struct sk_buff *oldskb, int hook)
 	tcph = (struct tcphdr *)(skb_network_header(nskb) + ip_hdrlen(nskb));
 
 	/* Swap source and dest */
-	tmp_addr = nskb->nh.iph->saddr;
+	niph = ip_hdr(nskb);
-	nskb->nh.iph->saddr = nskb->nh.iph->daddr;
+	tmp_addr = niph->saddr;
-	nskb->nh.iph->daddr = tmp_addr;
+	niph->saddr = niph->daddr;
+	niph->daddr = tmp_addr;
 	tmp_port = tcph->source;
 	tcph->source = tcph->dest;
 	tcph->dest = tmp_port;
@@ -96,7 +98,7 @@ static void send_reset(struct sk_buff *oldskb, int hook)
 	/* Truncate to length (no data) */
 	tcph->doff = sizeof(struct tcphdr)/4;
 	skb_trim(nskb, ip_hdrlen(nskb) + sizeof(struct tcphdr));
-	nskb->nh.iph->tot_len = htons(nskb->len);
+	niph->tot_len = htons(nskb->len);
 
 	if (tcph->ack) {
 		needs_ack = 0;
@@ -121,14 +123,13 @@ static void send_reset(struct sk_buff *oldskb, int hook)
 	/* Adjust TCP checksum */
 	tcph->check = 0;
 	tcph->check = tcp_v4_check(sizeof(struct tcphdr),
-				   nskb->nh.iph->saddr,
+				   niph->saddr, niph->daddr,
-				   nskb->nh.iph->daddr,
 				   csum_partial((char *)tcph,
 						sizeof(struct tcphdr), 0));
 
 	/* Set DF, id = 0 */
-	nskb->nh.iph->frag_off = htons(IP_DF);
+	niph->frag_off = htons(IP_DF);
-	nskb->nh.iph->id = 0;
+	niph->id = 0;
 
 	addr_type = RTN_UNSPEC;
 	if (hook != NF_IP_FORWARD
@@ -144,12 +145,11 @@ static void send_reset(struct sk_buff *oldskb, int hook)
 	nskb->ip_summed = CHECKSUM_NONE;
 
 	/* Adjust IP TTL */
-	nskb->nh.iph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT);
+	niph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT);
 
 	/* Adjust IP checksum */
-	nskb->nh.iph->check = 0;
+	niph->check = 0;
-	nskb->nh.iph->check = ip_fast_csum(skb_network_header(nskb),
+	niph->check = ip_fast_csum(skb_network_header(nskb), niph->ihl);
-					   nskb->nh.iph->ihl);
 
 	/* "Never happens" */
 	if (nskb->len > dst_mtu(nskb->dst))

net/ipv4/netfilter/ipt_TOS.c

@@ -29,13 +29,13 @@ target(struct sk_buff **pskb,
        const void *targinfo)
 {
 	const struct ipt_tos_target_info *tosinfo = targinfo;
-	struct iphdr *iph = (*pskb)->nh.iph;
+	struct iphdr *iph = ip_hdr(*pskb);
 
 	if ((iph->tos & IPTOS_TOS_MASK) != tosinfo->tos) {
 		__u8 oldtos;
 		if (!skb_make_writable(pskb, sizeof(struct iphdr)))
 			return NF_DROP;
-		iph = (*pskb)->nh.iph;
+		iph = ip_hdr(*pskb);
 		oldtos = iph->tos;
 		iph->tos = (iph->tos & IPTOS_PREC_MASK) | tosinfo->tos;
 		nf_csum_replace2(&iph->check, htons(oldtos), htons(iph->tos));

net/ipv4/netfilter/ipt_TTL.c

@@ -32,7 +32,7 @@ ipt_ttl_target(struct sk_buff **pskb,
 	if (!skb_make_writable(pskb, (*pskb)->len))
 		return NF_DROP;
 
-	iph = (*pskb)->nh.iph;
+	iph = ip_hdr(*pskb);
 
 	switch (info->mode) {
 		case IPT_TTL_SET:

net/ipv4/netfilter/ipt_addrtype.c

@@ -33,7 +33,7 @@ static int match(const struct sk_buff *skb,
 		 int offset, unsigned int protoff, int *hotdrop)
 {
 	const struct ipt_addrtype_info *info = matchinfo;
-	const struct iphdr *iph = skb->nh.iph;
+	const struct iphdr *iph = ip_hdr(skb);
 	int ret = 1;
 
 	if (info->source)

net/ipv4/netfilter/ipt_ecn.c

@@ -27,7 +27,7 @@ MODULE_LICENSE("GPL");
 static inline int match_ip(const struct sk_buff *skb,
 			   const struct ipt_ecn_info *einfo)
 {
-	return ((skb->nh.iph->tos&IPT_ECN_IP_MASK) == einfo->ip_ect);
+	return (ip_hdr(skb)->tos & IPT_ECN_IP_MASK) == einfo->ip_ect;
 }
 
 static inline int match_tcp(const struct sk_buff *skb,
@@ -80,7 +80,7 @@ static int match(const struct sk_buff *skb,
 			return 0;
 
 	if (info->operation & (IPT_ECN_OP_MATCH_ECE|IPT_ECN_OP_MATCH_CWR)) {
-		if (skb->nh.iph->protocol != IPPROTO_TCP)
+		if (ip_hdr(skb)->protocol != IPPROTO_TCP)
 			return 0;
 		if (!match_tcp(skb, info, hotdrop))
 			return 0;

net/ipv4/netfilter/ipt_iprange.c

@@ -32,7 +32,7 @@ match(const struct sk_buff *skb,
       int offset, unsigned int protoff, int *hotdrop)
 {
 	const struct ipt_iprange_info *info = matchinfo;
-	const struct iphdr *iph = skb->nh.iph;
+	const struct iphdr *iph = ip_hdr(skb);
 
 	if (info->flags & IPRANGE_SRC) {
 		if (((ntohl(iph->saddr) < ntohl(info->src.min_ip))

net/ipv4/netfilter/ipt_recent.c

@@ -183,11 +183,11 @@ ipt_recent_match(const struct sk_buff *skb,
 	int ret = info->invert;
 
 	if (info->side == IPT_RECENT_DEST)
-		addr = skb->nh.iph->daddr;
+		addr = ip_hdr(skb)->daddr;
 	else
-		addr = skb->nh.iph->saddr;
+		addr = ip_hdr(skb)->saddr;
 
-	ttl = skb->nh.iph->ttl;
+	ttl = ip_hdr(skb)->ttl;
 	/* use TTL as seen before forwarding */
 	if (out && !skb->sk)
 		ttl++;

net/ipv4/netfilter/ipt_tos.c

@@ -30,7 +30,7 @@ match(const struct sk_buff *skb,
 {
 	const struct ipt_tos_info *info = matchinfo;
 
-	return (skb->nh.iph->tos == info->tos) ^ info->invert;
+	return (ip_hdr(skb)->tos == info->tos) ^ info->invert;
 }
 
 static struct xt_match tos_match = {

net/ipv4/netfilter/ipt_ttl.c

@@ -26,19 +26,20 @@ static int match(const struct sk_buff *skb,
 		 int offset, unsigned int protoff, int *hotdrop)
 {
 	const struct ipt_ttl_info *info = matchinfo;
+	const u8 ttl = ip_hdr(skb)->ttl;
 
 	switch (info->mode) {
 		case IPT_TTL_EQ:
-			return (skb->nh.iph->ttl == info->ttl);
+			return (ttl == info->ttl);
 			break;
 		case IPT_TTL_NE:
-			return (!(skb->nh.iph->ttl == info->ttl));
+			return (!(ttl == info->ttl));
 			break;
 		case IPT_TTL_LT:
-			return (skb->nh.iph->ttl < info->ttl);
+			return (ttl < info->ttl);
 			break;
 		case IPT_TTL_GT:
-			return (skb->nh.iph->ttl > info->ttl);
+			return (ttl > info->ttl);
 			break;
 		default:
 			printk(KERN_WARNING "ipt_ttl: unknown mode %d\n",

net/ipv4/netfilter/iptable_mangle.c

@@ -131,6 +131,7 @@ ipt_local_hook(unsigned int hook,
 		   int (*okfn)(struct sk_buff *))
 {
 	unsigned int ret;
+	const struct iphdr *iph;
 	u_int8_t tos;
 	__be32 saddr, daddr;
 	u_int32_t mark;
@@ -145,19 +146,23 @@ ipt_local_hook(unsigned int hook,
 
 	/* Save things which could affect route */
 	mark = (*pskb)->mark;
-	saddr = (*pskb)->nh.iph->saddr;
+	iph = ip_hdr(*pskb);
-	daddr = (*pskb)->nh.iph->daddr;
+	saddr = iph->saddr;
-	tos = (*pskb)->nh.iph->tos;
+	daddr = iph->daddr;
+	tos = iph->tos;
 
 	ret = ipt_do_table(pskb, hook, in, out, &packet_mangler);
 	/* Reroute for ANY change. */
-	if (ret != NF_DROP && ret != NF_STOLEN && ret != NF_QUEUE
+	if (ret != NF_DROP && ret != NF_STOLEN && ret != NF_QUEUE) {
-	    && ((*pskb)->nh.iph->saddr != saddr
+		iph = ip_hdr(*pskb);
-		|| (*pskb)->nh.iph->daddr != daddr
+
-		|| (*pskb)->mark != mark
+		if (iph->saddr != saddr ||
-		|| (*pskb)->nh.iph->tos != tos))
+		    iph->daddr != daddr ||
-		if (ip_route_me_harder(pskb, RTN_UNSPEC))
+		    (*pskb)->mark != mark ||
-			ret = NF_DROP;
+		    iph->tos != tos)
+			if (ip_route_me_harder(pskb, RTN_UNSPEC))
+				ret = NF_DROP;
+	}
 
 	return ret;
 }

net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c

@@ -87,7 +87,7 @@ nf_ct_ipv4_gather_frags(struct sk_buff *skb, u_int32_t user)
 	local_bh_enable();
 
 	if (skb)
-		ip_send_check(skb->nh.iph);
+		ip_send_check(ip_hdr(skb));
 
 	return skb;
 }
@@ -97,16 +97,16 @@ ipv4_prepare(struct sk_buff **pskb, unsigned int hooknum, unsigned int *dataoff,
 	     u_int8_t *protonum)
 {
 	/* Never happen */
-	if ((*pskb)->nh.iph->frag_off & htons(IP_OFFSET)) {
+	if (ip_hdr(*pskb)->frag_off & htons(IP_OFFSET)) {
 		if (net_ratelimit()) {
 			printk(KERN_ERR "ipv4_prepare: Frag of proto %u (hook=%u)\n",
-			(*pskb)->nh.iph->protocol, hooknum);
+			ip_hdr(*pskb)->protocol, hooknum);
 		}
 		return -NF_DROP;
 	}
 
 	*dataoff = skb_network_offset(*pskb) + ip_hdrlen(*pskb);
-	*protonum = (*pskb)->nh.iph->protocol;
+	*protonum = ip_hdr(*pskb)->protocol;
 
 	return NF_ACCEPT;
 }
@@ -170,7 +170,7 @@ static unsigned int ipv4_conntrack_defrag(unsigned int hooknum,
 #endif
 
 	/* Gather fragments. */
-	if ((*pskb)->nh.iph->frag_off & htons(IP_MF|IP_OFFSET)) {
+	if (ip_hdr(*pskb)->frag_off & htons(IP_MF | IP_OFFSET)) {
 		*pskb = nf_ct_ipv4_gather_frags(*pskb,
 						hooknum == NF_IP_PRE_ROUTING ?
 						IP_DEFRAG_CONNTRACK_IN :

net/ipv4/netfilter/nf_nat_h323.c

@@ -44,7 +44,7 @@ static int set_addr(struct sk_buff **pskb,
 	buf.port = port;
 	addroff += dataoff;
 
-	if ((*pskb)->nh.iph->protocol == IPPROTO_TCP) {
+	if (ip_hdr(*pskb)->protocol == IPPROTO_TCP) {
 		if (!nf_nat_mangle_tcp_packet(pskb, ct, ctinfo,
 					      addroff, sizeof(buf),
 					      (char *) &buf, sizeof(buf))) {

net/ipv4/netfilter/nf_nat_helper.c

@@ -87,7 +87,7 @@ static void mangle_contents(struct sk_buff *skb,
 	unsigned char *data;
 
 	BUG_ON(skb_is_nonlinear(skb));
-	data = (unsigned char *)skb->nh.iph + dataoff;
+	data = skb_network_header(skb) + dataoff;
 
 	/* move post-replacement */
 	memmove(data + match_offset + rep_len,
@@ -111,8 +111,8 @@ static void mangle_contents(struct sk_buff *skb,
 	}
 
 	/* fix IP hdr checksum information */
-	skb->nh.iph->tot_len = htons(skb->len);
+	ip_hdr(skb)->tot_len = htons(skb->len);
-	ip_send_check(skb->nh.iph);
+	ip_send_check(ip_hdr(skb));
 }
 
 /* Unusual, but possible case. */
@@ -166,7 +166,7 @@ nf_nat_mangle_tcp_packet(struct sk_buff **pskb,
 
 	SKB_LINEAR_ASSERT(*pskb);
 
-	iph = (*pskb)->nh.iph;
+	iph = ip_hdr(*pskb);
 	tcph = (void *)iph + iph->ihl*4;
 
 	oldlen = (*pskb)->len - iph->ihl*4;
@@ -221,7 +221,7 @@ nf_nat_mangle_udp_packet(struct sk_buff **pskb,
 	int datalen, oldlen;
 
 	/* UDP helpers might accidentally mangle the wrong packet */
-	iph = (*pskb)->nh.iph;
+	iph = ip_hdr(*pskb);
 	if ((*pskb)->len < iph->ihl*4 + sizeof(*udph) +
 			       match_offset + match_len)
 		return 0;
@@ -234,7 +234,7 @@ nf_nat_mangle_udp_packet(struct sk_buff **pskb,
 	    !enlarge_skb(pskb, rep_len - match_len))
 		return 0;
 
-	iph = (*pskb)->nh.iph;
+	iph = ip_hdr(*pskb);
 	udph = (void *)iph + iph->ihl*4;
 
 	oldlen = (*pskb)->len - iph->ihl*4;

net/ipv4/netfilter/nf_nat_rule.c

@@ -191,7 +191,7 @@ static unsigned int ipt_dnat_target(struct sk_buff **pskb,
 
 	if (hooknum == NF_IP_LOCAL_OUT &&
 	    mr->range[0].flags & IP_NAT_RANGE_MAP_IPS)
-		warn_if_extra_mangle((*pskb)->nh.iph->daddr,
+		warn_if_extra_mangle(ip_hdr(*pskb)->daddr,
 				     mr->range[0].min_ip);
 
 	return nf_nat_setup_info(ct, &mr->range[0], hooknum);

net/ipv4/netfilter/nf_nat_snmp_basic.c

@@ -1194,7 +1194,7 @@ static int snmp_translate(struct nf_conn *ct,
 			  enum ip_conntrack_info ctinfo,
 			  struct sk_buff **pskb)
 {
-	struct iphdr *iph = (*pskb)->nh.iph;
+	struct iphdr *iph = ip_hdr(*pskb);
 	struct udphdr *udph = (struct udphdr *)((__be32 *)iph + iph->ihl);
 	u_int16_t udplen = ntohs(udph->len);
 	u_int16_t paylen = udplen - sizeof(struct udphdr);
@@ -1235,7 +1235,7 @@ static int help(struct sk_buff **pskb, unsigned int protoff,
 {
 	int dir = CTINFO2DIR(ctinfo);
 	unsigned int ret;
-	struct iphdr *iph = (*pskb)->nh.iph;
+	struct iphdr *iph = ip_hdr(*pskb);
 	struct udphdr *udph = (struct udphdr *)((u_int32_t *)iph + iph->ihl);
 
 	/* SNMP replies and originating SNMP traps get mangled */

net/ipv4/netfilter/nf_nat_standalone.c

@@ -86,8 +86,7 @@ nf_nat_fn(unsigned int hooknum,
 
 	/* We never see fragments: conntrack defrags on pre-routing
 	   and local-out, and nf_nat_out protects post-routing. */
-	NF_CT_ASSERT(!((*pskb)->nh.iph->frag_off
+	NF_CT_ASSERT(!(ip_hdr(*pskb)->frag_off & htons(IP_MF | IP_OFFSET)));
-		       & htons(IP_MF|IP_OFFSET)));
 
 	ct = nf_ct_get(*pskb, &ctinfo);
 	/* Can't track?  It's not due to stress, or conntrack would
@@ -98,7 +97,7 @@ nf_nat_fn(unsigned int hooknum,
 		/* Exception: ICMP redirect to new connection (not in
 		   hash table yet).  We must not let this through, in
 		   case we're doing NAT to the same network. */
-		if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP) {
+		if (ip_hdr(*pskb)->protocol == IPPROTO_ICMP) {
 			struct icmphdr _hdr, *hp;
 
 			hp = skb_header_pointer(*pskb, ip_hdrlen(*pskb),
@@ -121,7 +120,7 @@ nf_nat_fn(unsigned int hooknum,
 	switch (ctinfo) {
 	case IP_CT_RELATED:
 	case IP_CT_RELATED+IP_CT_IS_REPLY:
-		if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP) {
+		if (ip_hdr(*pskb)->protocol == IPPROTO_ICMP) {
 			if (!nf_nat_icmp_reply_translation(ct, ctinfo,
 							   hooknum, pskb))
 				return NF_DROP;
@@ -176,11 +175,11 @@ nf_nat_in(unsigned int hooknum,
 	  int (*okfn)(struct sk_buff *))
 {
 	unsigned int ret;
-	__be32 daddr = (*pskb)->nh.iph->daddr;
+	__be32 daddr = ip_hdr(*pskb)->daddr;
 
 	ret = nf_nat_fn(hooknum, pskb, in, out, okfn);
 	if (ret != NF_DROP && ret != NF_STOLEN &&
-	    daddr != (*pskb)->nh.iph->daddr) {
+	    daddr != ip_hdr(*pskb)->daddr) {
 		dst_release((*pskb)->dst);
 		(*pskb)->dst = NULL;
 	}

net/ipv4/raw.c

@@ -292,7 +292,7 @@ static int raw_send_hdrinc(struct sock *sk, void *from, size_t length,
 	skb->dst = dst_clone(&rt->u.dst);
 
 	skb_reset_network_header(skb);
-	iph = skb->nh.iph;
+	iph = ip_hdr(skb);
 	skb_put(skb, length);
 
 	skb->ip_summed = CHECKSUM_NONE;
@@ -615,7 +615,7 @@ static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 	/* Copy the address. */
 	if (sin) {
 		sin->sin_family = AF_INET;
-		sin->sin_addr.s_addr = skb->nh.iph->saddr;
+		sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
 		sin->sin_port = 0;
 		memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 	}

net/ipv4/route.c

@@ -1519,7 +1519,7 @@ static void ipv4_link_failure(struct sk_buff *skb)
 static int ip_rt_bug(struct sk_buff *skb)
 {
 	printk(KERN_DEBUG "ip_rt_bug: %u.%u.%u.%u -> %u.%u.%u.%u, %s\n",
-		NIPQUAD(skb->nh.iph->saddr), NIPQUAD(skb->nh.iph->daddr),
+		NIPQUAD(ip_hdr(skb)->saddr), NIPQUAD(ip_hdr(skb)->daddr),
 		skb->dev ? skb->dev->name : "?");
 	kfree_skb(skb);
 	return 0;
@@ -2134,7 +2134,7 @@ int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 		rcu_read_lock();
 		if ((in_dev = __in_dev_get_rcu(dev)) != NULL) {
 			int our = ip_check_mc(in_dev, daddr, saddr,
-				skb->nh.iph->protocol);
+				ip_hdr(skb)->protocol);
 			if (our
 #ifdef CONFIG_IP_MROUTE
 			    || (!LOCAL_MCAST(daddr) && IN_DEV_MFORWARD(in_dev))
@@ -2751,7 +2751,7 @@ int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
 	skb_reset_network_header(skb);
 
 	/* Bugfix: need to give ip_route_input enough of an IP header to not gag. */
-	skb->nh.iph->protocol = IPPROTO_ICMP;
+	ip_hdr(skb)->protocol = IPPROTO_ICMP;
 	skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr));
 
 	src = tb[RTA_SRC] ? nla_get_be32(tb[RTA_SRC]) : 0;