net: adopt skb_network_offset() and similar helpers

This is a cleanup patch, making code a bit more concise.

1) Use skb_network_offset(skb) in place of
       (skb_network_header(skb) - skb->data)

2) Use -skb_network_offset(skb) in place of
       (skb->data - skb_network_header(skb))

3) Use skb_transport_offset(skb) in place of
       (skb_transport_header(skb) - skb->data)

4) Use skb_inner_transport_offset(skb) in place of
       (skb_inner_transport_header(skb) - skb->data)

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Edward Cree <ecree.xilinx@gmail.com> # for sfc
Signed-off-by: David S. Miller <davem@davemloft.net>

24 files changed, 36 insertions, 40 deletions

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
index 528441b28c4e..adcee8d9d6d9 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
@@ -3538,7 +3538,7 @@ static u8 bnx2x_set_pbd_csum_enc(struct bnx2x *bp, struct sk_buff *skb,
 				 u32 *parsing_data, u32 xmit_type)
 {
 	*parsing_data |=
-		((((u8 *)skb_inner_transport_header(skb) - skb->data) >> 1) <<
+		((skb_inner_transport_offset(skb) >> 1) <<
 		ETH_TX_PARSE_BD_E2_L4_HDR_START_OFFSET_W_SHIFT) &
 		ETH_TX_PARSE_BD_E2_L4_HDR_START_OFFSET_W;
 
@@ -3570,7 +3570,7 @@ static u8 bnx2x_set_pbd_csum_e2(struct bnx2x *bp, struct sk_buff *skb,
 				u32 *parsing_data, u32 xmit_type)
 {
 	*parsing_data |=
-		((((u8 *)skb_transport_header(skb) - skb->data) >> 1) <<
+		((skb_transport_offset(skb) >> 1) <<
 		ETH_TX_PARSE_BD_E2_L4_HDR_START_OFFSET_W_SHIFT) &
 		ETH_TX_PARSE_BD_E2_L4_HDR_START_OFFSET_W;
 
@@ -3613,7 +3613,7 @@ static u8 bnx2x_set_pbd_csum(struct bnx2x *bp, struct sk_buff *skb,
 			     struct eth_tx_parse_bd_e1x *pbd,
 			     u32 xmit_type)
 {
-	u8 hlen = (skb_network_header(skb) - skb->data) >> 1;
+	u8 hlen = skb_network_offset(skb) >> 1;
 
 	/* for now NS flag is not used in Linux */
 	pbd->global_data =
@@ -3667,8 +3667,7 @@ static void bnx2x_update_pbds_gso_enc(struct sk_buff *skb,
 	u8 outerip_off, outerip_len = 0;
 
 	/* from outer IP to transport */
-	hlen_w = (skb_inner_transport_header(skb) -
-		  skb_network_header(skb)) >> 1;
+	hlen_w = skb_inner_transport_offset(skb) >> 1;
 
 	/* transport len */
 	hlen_w += inner_tcp_hdrlen(skb) >> 1;
@@ -3714,7 +3713,7 @@ static void bnx2x_update_pbds_gso_enc(struct sk_buff *skb,
 					0, IPPROTO_TCP, 0));
 	}
 
-	outerip_off = (skb_network_header(skb) - skb->data) >> 1;
+	outerip_off = (skb_network_offset(skb)) >> 1;
 
 	*global_data |=
 		outerip_off |
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index f1695c889d3a..19668a8d22f7 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -2473,9 +2473,9 @@ static netdev_features_t hns3_features_check(struct sk_buff *skb,
 		return features;
 
 	if (skb->encapsulation)
-		len = skb_inner_transport_header(skb) - skb->data;
+		len = skb_inner_transport_offset(skb);
 	else
-		len = skb_transport_header(skb) - skb->data;
+		len = skb_transport_offset(skb);
 
 	/* Assume L4 is 60 byte as TCP is the only protocol with a
 	 * a flexible value, and it's max len is 60 bytes.
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index f12092cdb1f0..a67b13869016 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -13208,7 +13208,7 @@ static netdev_features_t i40e_features_check(struct sk_buff *skb,
 		features &= ~NETIF_F_GSO_MASK;
 
 	/* MACLEN can support at most 63 words */
-	len = skb_network_header(skb) - skb->data;
+	len = skb_network_offset(skb);
 	if (len & ~(63 * 2))
 		goto out_err;
 
diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index 335fd13e86f7..245c458e38ae 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -4423,7 +4423,7 @@ static netdev_features_t iavf_features_check(struct sk_buff *skb,
 		features &= ~NETIF_F_GSO_MASK;
 
 	/* MACLEN can support at most 63 words */
-	len = skb_network_header(skb) - skb->data;
+	len = skb_network_offset(skb);
 	if (len & ~(63 * 2))
 		goto out_err;
 
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index cebb44f51d5f..b35556550503 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -2538,7 +2538,7 @@ igb_features_check(struct sk_buff *skb, struct net_device *dev,
 	unsigned int network_hdr_len, mac_hdr_len;
 
 	/* Make certain the headers can be described by a context descriptor */
-	mac_hdr_len = skb_network_header(skb) - skb->data;
+	mac_hdr_len = skb_network_offset(skb);
 	if (unlikely(mac_hdr_len > IGB_MAX_MAC_HDR_LEN))
 		return features & ~(NETIF_F_HW_CSUM |
 				    NETIF_F_SCTP_CRC |
diff --git a/drivers/net/ethernet/intel/igbvf/netdev.c b/drivers/net/ethernet/intel/igbvf/netdev.c
index a4d4f00e6a87..b0cf310e6f7b 100644
--- a/drivers/net/ethernet/intel/igbvf/netdev.c
+++ b/drivers/net/ethernet/intel/igbvf/netdev.c
@@ -2655,7 +2655,7 @@ igbvf_features_check(struct sk_buff *skb, struct net_device *dev,
 	unsigned int network_hdr_len, mac_hdr_len;
 
 	/* Make certain the headers can be described by a context descriptor */
-	mac_hdr_len = skb_network_header(skb) - skb->data;
+	mac_hdr_len = skb_network_offset(skb);
 	if (unlikely(mac_hdr_len > IGBVF_MAX_MAC_HDR_LEN))
 		return features & ~(NETIF_F_HW_CSUM |
 				    NETIF_F_SCTP_CRC |
diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index 3af52d238f3b..34820f6a78b9 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -5277,7 +5277,7 @@ igc_features_check(struct sk_buff *skb, struct net_device *dev,
 	unsigned int network_hdr_len, mac_hdr_len;
 
 	/* Make certain the headers can be described by a context descriptor */
-	mac_hdr_len = skb_network_header(skb) - skb->data;
+	mac_hdr_len = skb_network_offset(skb);
 	if (unlikely(mac_hdr_len > IGC_MAX_MAC_HDR_LEN))
 		return features & ~(NETIF_F_HW_CSUM |
 				    NETIF_F_SCTP_CRC |
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index e23c3614fb10..1e93edc967ed 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -10205,7 +10205,7 @@ ixgbe_features_check(struct sk_buff *skb, struct net_device *dev,
 	unsigned int network_hdr_len, mac_hdr_len;
 
 	/* Make certain the headers can be described by a context descriptor */
-	mac_hdr_len = skb_network_header(skb) - skb->data;
+	mac_hdr_len = skb_network_offset(skb);
 	if (unlikely(mac_hdr_len > IXGBE_MAX_MAC_HDR_LEN))
 		return features & ~(NETIF_F_HW_CSUM |
 				    NETIF_F_SCTP_CRC |
diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index a44e4bd56142..9c960017a6de 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -4413,7 +4413,7 @@ ixgbevf_features_check(struct sk_buff *skb, struct net_device *dev,
 	unsigned int network_hdr_len, mac_hdr_len;
 
 	/* Make certain the headers can be described by a context descriptor */
-	mac_hdr_len = skb_network_header(skb) - skb->data;
+	mac_hdr_len = skb_network_offset(skb);
 	if (unlikely(mac_hdr_len > IXGBEVF_MAX_MAC_HDR_LEN))
 		return features & ~(NETIF_F_HW_CSUM |
 				    NETIF_F_SCTP_CRC |
diff --git a/drivers/net/ethernet/qlogic/qede/qede_fp.c b/drivers/net/ethernet/qlogic/qede/qede_fp.c
index cb1746bc0e0c..847fa62c80df 100644
--- a/drivers/net/ethernet/qlogic/qede/qede_fp.c
+++ b/drivers/net/ethernet/qlogic/qede/qede_fp.c
@@ -215,7 +215,7 @@ static void qede_set_params_for_ipv6_ext(struct sk_buff *skb,
 
 	bd2_bits1 |= (1 << ETH_TX_DATA_2ND_BD_IPV6_EXT_SHIFT);
 
-	bd2_bits2 |= ((((u8 *)skb_transport_header(skb) - skb->data) >> 1) &
+	bd2_bits2 |= ((skb_transport_offset(skb) >> 1) &
 		     ETH_TX_DATA_2ND_BD_L4_HDR_START_OFFSET_W_MASK)
 		    << ETH_TX_DATA_2ND_BD_L4_HDR_START_OFFSET_W_SHIFT;
 
diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c
index 41894d154013..b9dc0071c5de 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c
@@ -446,8 +446,7 @@ static int qlcnic_tx_encap_pkt(struct qlcnic_adapter *adapter,
 	encap_descr |= skb_network_offset(skb) << 10;
 	first_desc->encap_descr = cpu_to_le16(encap_descr);
 
-	first_desc->tcp_hdr_offset = skb_inner_transport_header(skb) -
-				     skb->data;
+	first_desc->tcp_hdr_offset = skb_inner_transport_offset(skb);
 	first_desc->ip_hdr_offset = skb_inner_network_offset(skb);
 
 	qlcnic_set_tx_flags_opcode(first_desc, flags, opcode);
diff --git a/drivers/net/ethernet/sfc/siena/tx_common.c b/drivers/net/ethernet/sfc/siena/tx_common.c
index a7a9ab304e13..71f9b5ec5ae4 100644
--- a/drivers/net/ethernet/sfc/siena/tx_common.c
+++ b/drivers/net/ethernet/sfc/siena/tx_common.c
@@ -317,11 +317,10 @@ static int efx_tx_tso_header_length(struct sk_buff *skb)
 	size_t header_len;
 
 	if (skb->encapsulation)
-		header_len = skb_inner_transport_header(skb) -
-				skb->data +
+		header_len = skb_inner_transport_offset(skb) +
 				(inner_tcp_hdr(skb)->doff << 2u);
 	else
-		header_len = skb_transport_header(skb) - skb->data +
+		header_len = skb_transport_offset(skb) +
 				(tcp_hdr(skb)->doff << 2u);
 	return header_len;
 }
diff --git a/drivers/net/ethernet/sfc/tx_common.c b/drivers/net/ethernet/sfc/tx_common.c
index 9f2393d34371..2adb132b2f7e 100644
--- a/drivers/net/ethernet/sfc/tx_common.c
+++ b/drivers/net/ethernet/sfc/tx_common.c
@@ -336,11 +336,10 @@ int efx_tx_tso_header_length(struct sk_buff *skb)
 	size_t header_len;
 
 	if (skb->encapsulation)
-		header_len = skb_inner_transport_header(skb) -
-				skb->data +
+		header_len = skb_inner_transport_offset(skb) +
 				(inner_tcp_hdr(skb)->doff << 2u);
 	else
-		header_len = skb_transport_header(skb) - skb->data +
+		header_len = skb_transport_offset(skb) +
 				(tcp_hdr(skb)->doff << 2u);
 	return header_len;
 }
diff --git a/drivers/net/ethernet/sfc/tx_tso.c b/drivers/net/ethernet/sfc/tx_tso.c
index 64a6768f75ea..ddf149db8180 100644
--- a/drivers/net/ethernet/sfc/tx_tso.c
+++ b/drivers/net/ethernet/sfc/tx_tso.c
@@ -174,8 +174,8 @@ static int tso_start(struct tso_state *st, struct efx_nic *efx,
 	unsigned int header_len, in_len;
 	dma_addr_t dma_addr;
 
-	st->ip_off = skb_network_header(skb) - skb->data;
-	st->tcp_off = skb_transport_header(skb) - skb->data;
+	st->ip_off = skb_network_offset(skb);
+	st->tcp_off = skb_transport_offset(skb);
 	header_len = st->tcp_off + (tcp_hdr(skb)->doff << 2u);
 	in_len = skb_headlen(skb) - header_len;
 	st->header_len = header_len;
diff --git a/drivers/net/ethernet/sun/sunvnet_common.c b/drivers/net/ethernet/sun/sunvnet_common.c
index 3525d5c0d694..351609f4f011 100644
--- a/drivers/net/ethernet/sun/sunvnet_common.c
+++ b/drivers/net/ethernet/sun/sunvnet_common.c
@@ -1144,9 +1144,9 @@ static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies)
 		nskb->protocol = skb->protocol;
 		offset = skb_mac_header(skb) - skb->data;
 		skb_set_mac_header(nskb, offset);
-		offset = skb_network_header(skb) - skb->data;
+		offset = skb_network_offset(skb);
 		skb_set_network_header(nskb, offset);
-		offset = skb_transport_header(skb) - skb->data;
+		offset = skb_transport_offset(skb);
 		skb_set_transport_header(nskb, offset);
 
 		offset = 0;
diff --git a/drivers/net/ethernet/wangxun/libwx/wx_lib.c b/drivers/net/ethernet/wangxun/libwx/wx_lib.c
index 7cf02ab6de68..6dff2c85682d 100644
--- a/drivers/net/ethernet/wangxun/libwx/wx_lib.c
+++ b/drivers/net/ethernet/wangxun/libwx/wx_lib.c
@@ -1257,7 +1257,7 @@ static int wx_tso(struct wx_ring *tx_ring, struct wx_tx_buffer *first,
 
 	/* compute header lengths */
 	l4len = enc ? inner_tcp_hdrlen(skb) : tcp_hdrlen(skb);
-	*hdr_len = enc ? (skb_inner_transport_header(skb) - skb->data) :
+	*hdr_len = enc ? skb_inner_transport_offset(skb) :
 			 skb_transport_offset(skb);
 	*hdr_len += l4len;
 
diff --git a/drivers/net/wireguard/receive.c b/drivers/net/wireguard/receive.c
index a176653c8861..df275b4fccb6 100644
--- a/drivers/net/wireguard/receive.c
+++ b/drivers/net/wireguard/receive.c
@@ -263,7 +263,7 @@ static bool decrypt_packet(struct sk_buff *skb, struct noise_keypair *keypair)
 	 * call skb_cow_data, so that there's no chance that data is removed
 	 * from the skb, so that later we can extract the original endpoint.
 	 */
-	offset = skb->data - skb_network_header(skb);
+	offset = -skb_network_offset(skb);
 	skb_push(skb, offset);
 	num_frags = skb_cow_data(skb, 0, &trailer);
 	offset += sizeof(struct message_data);
diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c
index 5a568bbbeaeb..82243cb6c54d 100644
--- a/kernel/bpf/cgroup.c
+++ b/kernel/bpf/cgroup.c
@@ -1358,7 +1358,7 @@ int __cgroup_bpf_run_filter_skb(struct sock *sk,
 				struct sk_buff *skb,
 				enum cgroup_bpf_attach_type atype)
 {
-	unsigned int offset = skb->data - skb_network_header(skb);
+	unsigned int offset = -skb_network_offset(skb);
 	struct sock *save_sk;
 	void *saved_data_end;
 	struct cgroup *cgrp;
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 7d2bdfd7e7d7..a82fd102df05 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -310,7 +310,7 @@ int raw_rcv(struct sock *sk, struct sk_buff *skb)
 	}
 	nf_reset_ct(skb);
 
-	skb_push(skb, skb->data - skb_network_header(skb));
+	skb_push(skb, -skb_network_offset(skb));
 
 	raw_rcv_skb(sk, skb);
 	return 0;
diff --git a/net/ipv4/xfrm4_input.c b/net/ipv4/xfrm4_input.c
index c54676998eb6..dae35101d189 100644
--- a/net/ipv4/xfrm4_input.c
+++ b/net/ipv4/xfrm4_input.c
@@ -58,7 +58,7 @@ int xfrm4_transport_finish(struct sk_buff *skb, int async)
 		return -iph->protocol;
 #endif
 
-	__skb_push(skb, skb->data - skb_network_header(skb));
+	__skb_push(skb, -skb_network_offset(skb));
 	iph->tot_len = htons(skb->len);
 	ip_send_check(iph);
 
diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c
index 26f1e4a5ade0..25a5b394481b 100644
--- a/net/ipv6/exthdrs.c
+++ b/net/ipv6/exthdrs.c
@@ -804,7 +804,7 @@ looped_back:
 
 	ip6_route_input(skb);
 	if (skb_dst(skb)->error) {
-		skb_push(skb, skb->data - skb_network_header(skb));
+		skb_push(skb, -skb_network_offset(skb));
 		dst_input(skb);
 		return -1;
 	}
@@ -821,7 +821,7 @@ looped_back:
 		goto looped_back;
 	}
 
-	skb_push(skb, skb->data - skb_network_header(skb));
+	skb_push(skb, -skb_network_offset(skb));
 	dst_input(skb);
 	return -1;
 
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index b2dd48911c8d..1a51a44571c3 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -327,9 +327,9 @@ static int nf_ct_frag6_reasm(struct frag_queue *fq, struct sk_buff *skb,
 	if (!reasm_data)
 		goto err;
 
-	payload_len = ((skb->data - skb_network_header(skb)) -
+	payload_len = -skb_network_offset(skb) -
 		       sizeof(struct ipv6hdr) + fq->q.len -
-		       sizeof(struct frag_hdr));
+		       sizeof(struct frag_hdr);
 	if (payload_len > IPV6_MAXPLEN) {
 		net_dbg_ratelimited("nf_ct_frag6_reasm: payload len = %d\n",
 				    payload_len);
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index 5ebc47da1000..acb4f119e11f 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -272,9 +272,9 @@ static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *skb,
 	if (!reasm_data)
 		goto out_oom;
 
-	payload_len = ((skb->data - skb_network_header(skb)) -
+	payload_len = -skb_network_offset(skb) -
 		       sizeof(struct ipv6hdr) + fq->q.len -
-		       sizeof(struct frag_hdr));
+		       sizeof(struct frag_hdr);
 	if (payload_len > IPV6_MAXPLEN)
 		goto out_oversize;
 
diff --git a/net/ipv6/xfrm6_input.c b/net/ipv6/xfrm6_input.c
index 6e36e5047fba..a17d783dc7c0 100644
--- a/net/ipv6/xfrm6_input.c
+++ b/net/ipv6/xfrm6_input.c
@@ -43,7 +43,7 @@ static int xfrm6_transport_finish2(struct net *net, struct sock *sk,
 int xfrm6_transport_finish(struct sk_buff *skb, int async)
 {
 	struct xfrm_offload *xo = xfrm_offload(skb);
-	int nhlen = skb->data - skb_network_header(skb);
+	int nhlen = -skb_network_offset(skb);
 
 	skb_network_header(skb)[IP6CB(skb)->nhoff] =
 		XFRM_MODE_SKB_CB(skb)->protocol;