[SK_BUFF]: Introduce skb_network_offset()

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

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

18 files changed, 33 insertions, 28 deletions

diff --git a/drivers/isdn/i4l/isdn_net.c b/drivers/isdn/i4l/isdn_net.c
index fadb9291bc1b..0c2b3752e46e 100644
--- a/drivers/isdn/i4l/isdn_net.c
+++ b/drivers/isdn/i4l/isdn_net.c
@@ -1121,7 +1121,7 @@ isdn_net_adjust_hdr(struct sk_buff *skb, struct net_device *dev)
         if (!skb)
                 return;
         if (lp->p_encap == ISDN_NET_ENCAP_ETHER) {
-                int pullsize = (ulong)skb->nh.raw - (ulong)skb->data - ETH_HLEN;
+                const int pullsize = skb_network_offset(skb) - ETH_HLEN;
                 if (pullsize > 0) {
                         printk(KERN_DEBUG "isdn_net: Pull junk %d\n", pullsize);
                         skb_pull(skb, pullsize);
diff --git a/drivers/net/atl1/atl1_main.c b/drivers/net/atl1/atl1_main.c
index e3f181602e4f..793a61b2140f 100644
--- a/drivers/net/atl1/atl1_main.c
+++ b/drivers/net/atl1/atl1_main.c
@@ -1300,7 +1300,7 @@ static int atl1_tso(struct atl1_adapter *adapter, struct sk_buff *skb,
                             ~csum_tcpudp_magic(skb->nh.iph->saddr,
                                                skb->nh.iph->daddr, 0,
                                                IPPROTO_TCP, 0);
-                        ipofst = skb->nh.raw - skb->data;
+                        ipofst = skb_network_offset(skb);
                         if (ipofst != ENET_HEADER_SIZE) /* 802.3 frame */
                                 tso->tsopl |= 1 << TSO_PARAM_ETHTYPE_SHIFT;
 
diff --git a/drivers/net/chelsio/sge.c b/drivers/net/chelsio/sge.c
index 47fa8dcf7527..8cdee67d582f 100644
--- a/drivers/net/chelsio/sge.c
+++ b/drivers/net/chelsio/sge.c
@@ -1865,7 +1865,7 @@ int t1_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
                 ++st->tx_tso;
 
-                eth_type = skb->nh.raw - skb->data == ETH_HLEN ?
+                eth_type = skb_network_offset(skb) == ETH_HLEN ?
                         CPL_ETH_II : CPL_ETH_II_VLAN;
 
                 hdr = (struct cpl_tx_pkt_lso *)skb_push(skb, sizeof(*hdr));
diff --git a/drivers/net/cxgb3/sge.c b/drivers/net/cxgb3/sge.c
index 4dd712088bcf..7e9e9db4fb97 100644
--- a/drivers/net/cxgb3/sge.c
+++ b/drivers/net/cxgb3/sge.c
@@ -897,7 +897,7 @@ static void write_tx_pkt_wr(struct adapter *adap, struct sk_buff *skb,
                 d->flit[2] = 0;
                 cntrl |= V_TXPKT_OPCODE(CPL_TX_PKT_LSO);
                 hdr->cntrl = htonl(cntrl);
-                eth_type = skb->nh.raw - skb->data == ETH_HLEN ?
+                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) |
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index b28a915bd980..86161011b539 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -2910,7 +2910,7 @@ e1000_tso(struct e1000_adapter *adapter, struct e1000_tx_ring *tx_ring,
                                                  0);
                         ipcse = 0;
                 }
-                ipcss = skb->nh.raw - skb->data;
+                ipcss = skb_network_offset(skb);
                 ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
                 tucss = skb->h.raw - skb->data;
                 tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
index 1d019195a391..c7a70933c759 100644
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -952,7 +952,7 @@ static inline void gfar_tx_checksum(struct sk_buff *skb, struct txfcb *fcb)
          * frame (skb->data) and the start of the IP hdr.
          * l4os is the distance between the start of the
          * l3 hdr and the l4 hdr */
-        fcb->l3os = (u16)(skb->nh.raw - skb->data - GMAC_FCB_LEN);
+        fcb->l3os = (u16)(skb_network_offset(skb) - GMAC_FCB_LEN);
         fcb->l4os = (u16)(skb->h.raw - skb->nh.raw);
 
         fcb->flags = flags;
diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c
index afc2ec72529e..cfb791bb45e2 100644
--- a/drivers/net/ixgb/ixgb_main.c
+++ b/drivers/net/ixgb/ixgb_main.c
@@ -1195,7 +1195,7 @@ ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
                 skb->h.th->check = ~csum_tcpudp_magic(skb->nh.iph->saddr,
                                                       skb->nh.iph->daddr,
                                                       0, IPPROTO_TCP, 0);
-                ipcss = skb->nh.raw - skb->data;
+                ipcss = skb_network_offset(skb);
                 ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
                 ipcse = skb->h.raw - skb->data - 1;
                 tucss = skb->h.raw - skb->data;
diff --git a/drivers/net/netxen/netxen_nic_hw.c b/drivers/net/netxen/netxen_nic_hw.c
index 6537574a9cda..625e11ed6aae 100644
--- a/drivers/net/netxen/netxen_nic_hw.c
+++ b/drivers/net/netxen/netxen_nic_hw.c
@@ -386,7 +386,7 @@ void netxen_tso_check(struct netxen_adapter *adapter,
         }
         adapter->stats.xmitcsummed++;
         desc->tcp_hdr_offset = skb->h.raw - skb->data;
-        desc->ip_hdr_offset = skb->nh.raw - skb->data;
+        desc->ip_hdr_offset = skb_network_offset(skb);
 }
 
 int netxen_is_flash_supported(struct netxen_adapter *adapter)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 6440c78fe625..47cc8b07c2b4 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -965,6 +965,11 @@ static inline void skb_reset_network_header(struct sk_buff *skb)
         skb->nh.raw = skb->data;
 }
 
+static inline int skb_network_offset(const struct sk_buff *skb)
+{
+        return skb->nh.raw - skb->data;
+}
+
 static inline unsigned char *skb_mac_header(const struct sk_buff *skb)
 {
         return skb->mac.raw;
diff --git a/net/ax25/ax25_out.c b/net/ax25/ax25_out.c
index 6e08dc8dee40..02dea851a11a 100644
--- a/net/ax25/ax25_out.c
+++ b/net/ax25/ax25_out.c
@@ -148,7 +148,7 @@ void ax25_output(ax25_cb *ax25, int paclen, struct sk_buff *skb)
 
                         if (ka9qfrag == 1) {
                                 skb_reserve(skbn, frontlen + 2);
-                                skbn->nh.raw = skbn->data + (skb->nh.raw - skb->data);
+                                skbn->nh.raw = skbn->data + skb_network_offset(skb);
                                 memcpy(skb_put(skbn, len), skb->data, len);
                                 p = skb_push(skbn, 2);
 
@@ -161,7 +161,7 @@ void ax25_output(ax25_cb *ax25, int paclen, struct sk_buff *skb)
                                 }
                         } else {
                                 skb_reserve(skbn, frontlen + 1);
-                                skbn->nh.raw = skbn->data + (skb->nh.raw - skb->data);
+                                skbn->nh.raw = skbn->data + skb_network_offset(skb);
                                 memcpy(skb_put(skbn, len), skb->data, len);
                                 p = skb_push(skbn, 1);
                                 *p = AX25_P_TEXT;
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 841e3f32cab1..c5653c512b43 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -1125,7 +1125,7 @@ int neigh_compat_output(struct sk_buff *skb)
 {
         struct net_device *dev = skb->dev;
 
-        __skb_pull(skb, skb->nh.raw - skb->data);
+        __skb_pull(skb, skb_network_offset(skb));
 
         if (dev->hard_header &&
             dev->hard_header(skb, dev, ntohs(skb->protocol), NULL, NULL,
@@ -1147,7 +1147,7 @@ int neigh_resolve_output(struct sk_buff *skb)
         if (!dst || !(neigh = dst->neighbour))
                 goto discard;
 
-        __skb_pull(skb, skb->nh.raw - skb->data);
+        __skb_pull(skb, skb_network_offset(skb));
 
         if (!neigh_event_send(neigh, skb)) {
                 int err;
@@ -1190,7 +1190,7 @@ int neigh_connected_output(struct sk_buff *skb)
         struct neighbour *neigh = dst->neighbour;
         struct net_device *dev = neigh->dev;
 
-        __skb_pull(skb, skb->nh.raw - skb->data);
+        __skb_pull(skb, skb_network_offset(skb));
 
         read_lock_bh(&neigh->lock);
         err = dev->hard_header(skb, dev, ntohs(skb->protocol),
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 99cd90c22310..669f5d97c6eb 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -96,7 +96,7 @@ __inline__ void ip_send_check(struct iphdr *iph)
 static int ip_dev_loopback_xmit(struct sk_buff *newskb)
 {
         skb_reset_mac_header(newskb);
-        __skb_pull(newskb, newskb->nh.raw - newskb->data);
+        __skb_pull(newskb, skb_network_offset(newskb));
         newskb->pkt_type = PACKET_LOOPBACK;
         newskb->ip_summed = CHECKSUM_UNNECESSARY;
         BUG_TRAP(newskb->dst);
@@ -1199,7 +1199,7 @@ int ip_push_pending_frames(struct sock *sk)
 
         /* move skb->data to ip header from ext header */
         if (skb->data < skb->nh.raw)
-                __skb_pull(skb, skb->nh.raw - skb->data);
+                __skb_pull(skb, skb_network_offset(skb));
         while ((tmp_skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) {
                 __skb_pull(tmp_skb, skb->h.raw - skb->nh.raw);
                 *tail_skb = tmp_skb;
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index a91dfbce8433..aa4a0a59ffac 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -206,7 +206,7 @@ static __inline__ int opt_unrec(struct sk_buff *skb, __u32 offset)
 {
         u8 _optval, *op;
 
-        offset += skb->nh.raw - skb->data;
+        offset += skb_network_offset(skb);
         op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval);
         if (op == NULL)
                 return 1;
@@ -431,7 +431,7 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
                 tclass = 0;
 
         msg.skb = skb;
-        msg.offset = skb->nh.raw - skb->data;
+        msg.offset = skb_network_offset(skb);
         msg.type = type;
 
         len = skb->len - msg.offset;
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 8a7b5c760147..47d00210cba1 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -89,7 +89,7 @@ static inline int ip6_output_finish(struct sk_buff *skb)
 static int ip6_dev_loopback_xmit(struct sk_buff *newskb)
 {
         skb_reset_mac_header(newskb);
-        __skb_pull(newskb, newskb->nh.raw - newskb->data);
+        __skb_pull(newskb, skb_network_offset(newskb));
         newskb->pkt_type = PACKET_LOOPBACK;
         newskb->ip_summed = CHECKSUM_UNNECESSARY;
         BUG_TRAP(newskb->dst);
@@ -1330,7 +1330,7 @@ int ip6_push_pending_frames(struct sock *sk)
 
         /* move skb->data to ip header from ext header */
         if (skb->data < skb->nh.raw)
-                __skb_pull(skb, skb->nh.raw - skb->data);
+                __skb_pull(skb, skb_network_offset(skb));
         while ((tmp_skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) {
                 __skb_pull(tmp_skb, skb->h.raw - skb->nh.raw);
                 *tail_skb = tmp_skb;
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index b3a70eb6d42a..7694c51f1251 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -768,7 +768,7 @@ resolve_normal_ct(struct sk_buff *skb,
         struct nf_conntrack_tuple_hash *h;
         struct nf_conn *ct;
 
-        if (!nf_ct_get_tuple(skb, (unsigned int)(skb->nh.raw - skb->data),
+        if (!nf_ct_get_tuple(skb, skb_network_offset(skb),
                              dataoff, l3num, protonum, &tuple, l3proto,
                              l4proto)) {
                 DEBUGP("resolve_normal_ct: Can't get tuple\n");
@@ -960,7 +960,7 @@ void __nf_ct_refresh_acct(struct nf_conn *ct,
         if (do_acct) {
                 ct->counters[CTINFO2DIR(ctinfo)].packets++;
                 ct->counters[CTINFO2DIR(ctinfo)].bytes +=
-                        skb->len - (unsigned int)(skb->nh.raw - skb->data);
+                        skb->len - skb_network_offset(skb);
 
                 if ((ct->counters[CTINFO2DIR(ctinfo)].packets & 0x80000000)
                     || (ct->counters[CTINFO2DIR(ctinfo)].bytes & 0x80000000))
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 1225e751b3f1..a059cc7be672 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -491,7 +491,7 @@ static int packet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet
                         skb_push(skb, skb->data - skb_mac_header(skb));
                 else if (skb->pkt_type == PACKET_OUTGOING) {
                         /* Special case: outgoing packets have ll header at head */
-                        skb_pull(skb, skb->nh.raw - skb->data);
+                        skb_pull(skb, skb_network_offset(skb));
                 }
         }
 
@@ -595,7 +595,7 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packe
                         skb_push(skb, skb->data - skb_mac_header(skb));
                 else if (skb->pkt_type == PACKET_OUTGOING) {
                         /* Special case: outgoing packets have ll header at head */
-                        skb_pull(skb, skb->nh.raw - skb->data);
+                        skb_pull(skb, skb_network_offset(skb));
                 }
         }
 
@@ -613,7 +613,7 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packe
         if (sk->sk_type == SOCK_DGRAM) {
                 macoff = netoff = TPACKET_ALIGN(TPACKET_HDRLEN) + 16;
         } else {
-                unsigned maclen = skb->nh.raw - skb->data;
+                unsigned maclen = skb_network_offset(skb);
                 netoff = TPACKET_ALIGN(TPACKET_HDRLEN + (maclen < 16 ? 16 : maclen));
                 macoff = netoff - maclen;
         }
@@ -1145,7 +1145,7 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
                 aux.tp_len = PACKET_SKB_CB(skb)->origlen;
                 aux.tp_snaplen = skb->len;
                 aux.tp_mac = 0;
-                aux.tp_net = skb->nh.raw - skb->data;
+                aux.tp_net = skb_network_offset(skb);
 
                 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
         }
diff --git a/net/sched/sch_teql.c b/net/sched/sch_teql.c
index 587123c61af9..d24914db7861 100644
--- a/net/sched/sch_teql.c
+++ b/net/sched/sch_teql.c
@@ -323,7 +323,7 @@ restart:
                         nores = 1;
                         break;
                 }
-                __skb_pull(skb, skb->nh.raw - skb->data);
+                __skb_pull(skb, skb_network_offset(skb));
         } while ((q = NEXT_SLAVE(q)) != start);
 
         if (nores && skb_res == NULL) {
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index d41e24d6ae41..addb58501057 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2944,7 +2944,7 @@ static int selinux_parse_skb_ipv4(struct sk_buff *skb,
         int offset, ihlen, ret = -EINVAL;
         struct iphdr _iph, *ih;
 
-        offset = skb->nh.raw - skb->data;
+        offset = skb_network_offset(skb);
         ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
         if (ih == NULL)
                 goto out;
@@ -3026,7 +3026,7 @@ static int selinux_parse_skb_ipv6(struct sk_buff *skb,
         int ret = -EINVAL, offset;
         struct ipv6hdr _ipv6h, *ip6;
 
-        offset = skb->nh.raw - skb->data;
+        offset = skb_network_offset(skb);
         ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
         if (ip6 == NULL)
                 goto out;