[NET]: Wrap hard_header_parse

Wrap the hard_header_parse function to simplify next step of
header_ops conversion.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

11 files changed, 40 insertions, 44 deletions

diff --git a/drivers/ieee1394/eth1394.c b/drivers/ieee1394/eth1394.c
index 33b80817d68c..b31f90082e35 100644
--- a/drivers/ieee1394/eth1394.c
+++ b/drivers/ieee1394/eth1394.c
@@ -162,7 +162,8 @@ static int ether1394_header(struct sk_buff *skb, struct net_device *dev,
                             unsigned short type, void *daddr, void *saddr,
                             unsigned len);
 static int ether1394_rebuild_header(struct sk_buff *skb);
-static int ether1394_header_parse(struct sk_buff *skb, unsigned char *haddr);
+static int ether1394_header_parse(const struct sk_buff *skb,
+                                  unsigned char *haddr);
 static int ether1394_header_cache(struct neighbour *neigh, struct hh_cache *hh);
 static void ether1394_header_cache_update(struct hh_cache *hh,
                                           struct net_device *dev,
@@ -751,11 +752,10 @@ static int ether1394_rebuild_header(struct sk_buff *skb)
         return 0;
 }
 
-static int ether1394_header_parse(struct sk_buff *skb, unsigned char *haddr)
+static int ether1394_header_parse(const struct sk_buff *skb,
+                                  unsigned char *haddr)
 {
-        struct net_device *dev = skb->dev;
-
-        memcpy(haddr, dev->dev_addr, ETH1394_ALEN);
+        memcpy(haddr, skb->dev->dev_addr, ETH1394_ALEN);
         return ETH1394_ALEN;
 }
 
diff --git a/drivers/net/wireless/airo.c b/drivers/net/wireless/airo.c
index 95d3cd1c49a7..cd03a61359aa 100644
--- a/drivers/net/wireless/airo.c
+++ b/drivers/net/wireless/airo.c
@@ -2481,7 +2481,7 @@ void stop_airo_card( struct net_device *dev, int freeres )
 
 EXPORT_SYMBOL(stop_airo_card);
 
-static int wll_header_parse(struct sk_buff *skb, unsigned char *haddr)
+static int wll_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 {
         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN);
         return ETH_ALEN;
@@ -2698,11 +2698,6 @@ static int mpi_map_card(struct airo_info *ai, struct pci_dev *pci)
 
 static void wifi_setup(struct net_device *dev)
 {
-        dev->hard_header        = NULL;
-        dev->rebuild_header     = NULL;
-        dev->hard_header_cache  = NULL;
-        dev->header_cache_update= NULL;
-
         dev->hard_header_parse  = wll_header_parse;
         dev->hard_start_xmit = &airo_start_xmit11;
         dev->get_stats = &airo_get_stats;
diff --git a/drivers/s390/net/qeth_main.c b/drivers/s390/net/qeth_main.c
index 8c46978e0afa..65225b3989dd 100644
--- a/drivers/s390/net/qeth_main.c
+++ b/drivers/s390/net/qeth_main.c
@@ -6561,10 +6561,10 @@ static struct ethtool_ops qeth_ethtool_ops = {
 };
 
 static int
-qeth_hard_header_parse(struct sk_buff *skb, unsigned char *haddr)
+qeth_hard_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 {
-        struct qeth_card *card;
-        struct ethhdr *eth;
+        const struct qeth_card *card;
+        const struct ethhdr *eth;
 
         card = qeth_get_card_from_dev(skb->dev);
         if (card->options.layer2)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index b33d084712fa..aae9ec367f5d 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -657,7 +657,7 @@ struct net_device
         void                    (*vlan_rx_kill_vid)(struct net_device *dev,
                                                     unsigned short vid);
 
-        int                     (*hard_header_parse)(struct sk_buff *skb,
+        int                     (*hard_header_parse)(const struct sk_buff *skb,
                                                      unsigned char *haddr);
         int                     (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
 #ifdef CONFIG_NETPOLL
@@ -809,6 +809,16 @@ static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
         return dev->hard_header(skb, dev, type, daddr, saddr, len);
 }
 
+static inline int dev_parse_header(const struct sk_buff *skb,
+                                   unsigned char *haddr)
+{
+        const struct net_device *dev = skb->dev;
+
+        if (!dev->hard_header_parse)
+                return 0;
+        return dev->hard_header_parse(skb, haddr);
+}
+
 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
 extern int              register_gifconf(unsigned int family, gifconf_func_t * gifconf);
 static inline int unregister_gifconf(unsigned int family)
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 2aaf6faf74ac..bdeb2f0ace32 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -207,9 +207,9 @@ EXPORT_SYMBOL(eth_type_trans);
  * @skb: packet to extract header from
  * @haddr: destination buffer
  */
-static int eth_header_parse(struct sk_buff *skb, unsigned char *haddr)
+static int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 {
-        struct ethhdr *eth = eth_hdr(skb);
+        const struct ethhdr *eth = eth_hdr(skb);
         memcpy(haddr, eth->h_source, ETH_ALEN);
         return ETH_ALEN;
 }
diff --git a/net/ipv4/netfilter/ip_queue.c b/net/ipv4/netfilter/ip_queue.c
index 82fda92e6b97..aaa3f5c56761 100644
--- a/net/ipv4/netfilter/ip_queue.c
+++ b/net/ipv4/netfilter/ip_queue.c
@@ -250,10 +250,8 @@ ipq_build_packet_message(struct ipq_queue_entry *entry, int *errp)
 
         if (entry->info->indev && entry->skb->dev) {
                 pmsg->hw_type = entry->skb->dev->type;
-                if (entry->skb->dev->hard_header_parse)
-                        pmsg->hw_addrlen =
-                                entry->skb->dev->hard_header_parse(entry->skb,
-                                                                   pmsg->hw_addr);
+                pmsg->hw_addrlen = dev_parse_header(entry->skb,
+                                                    pmsg->hw_addr);
         }
 
         if (data_len)
diff --git a/net/ipv6/netfilter/ip6_queue.c b/net/ipv6/netfilter/ip6_queue.c
index 2f5a52453834..c75f467a8f51 100644
--- a/net/ipv6/netfilter/ip6_queue.c
+++ b/net/ipv6/netfilter/ip6_queue.c
@@ -248,10 +248,7 @@ ipq_build_packet_message(struct ipq_queue_entry *entry, int *errp)
 
         if (entry->info->indev && entry->skb->dev) {
                 pmsg->hw_type = entry->skb->dev->type;
-                if (entry->skb->dev->hard_header_parse)
-                        pmsg->hw_addrlen =
-                                entry->skb->dev->hard_header_parse(entry->skb,
-                                                                   pmsg->hw_addr);
+                pmsg->hw_addrlen = dev_parse_header(entry->skb, pmsg->hw_addr);
         }
 
         if (data_len)
diff --git a/net/mac80211/ieee80211.c b/net/mac80211/ieee80211.c
index 89be6629cfc0..0cdcf0d0c6ca 100644
--- a/net/mac80211/ieee80211.c
+++ b/net/mac80211/ieee80211.c
@@ -47,7 +47,7 @@ struct ieee80211_tx_status_rtap_hdr {
 
 /* common interface routines */
 
-static int header_parse_80211(struct sk_buff *skb, unsigned char *haddr)
+static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
 {
         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
         return ETH_ALEN;
diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
index 8e4001b8f764..332e0f7f6f9e 100644
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -481,12 +481,13 @@ __build_packet_message(struct nfulnl_instance *inst,
                 NFA_PUT(inst->skb, NFULA_MARK, sizeof(tmp_uint), &tmp_uint);
         }
 
-        if (indev && skb->dev && skb->dev->hard_header_parse) {
+        if (indev && skb->dev) {
                 struct nfulnl_msg_packet_hw phw;
-                int len = skb->dev->hard_header_parse((struct sk_buff *)skb,
-                                                    phw.hw_addr);
-                phw.hw_addrlen = htons(len);
-                NFA_PUT(inst->skb, NFULA_HWADDR, sizeof(phw), &phw);
+                int len = dev_parse_header(skb, phw.hw_addr);
+                if (len > 0) {
+                        phw.hw_addrlen = htons(len);
+                        NFA_PUT(inst->skb, NFULA_HWADDR, sizeof(phw), &phw);
+                }
         }
 
         if (skb->tstamp.tv64) {
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index c97369f48db7..a813185c766d 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -485,14 +485,13 @@ nfqnl_build_packet_message(struct nfqnl_instance *queue,
                 NFA_PUT(skb, NFQA_MARK, sizeof(u_int32_t), &tmp_uint);
         }
 
-        if (indev && entskb->dev
-            && entskb->dev->hard_header_parse) {
+        if (indev && entskb->dev) {
                 struct nfqnl_msg_packet_hw phw;
-
-                int len = entskb->dev->hard_header_parse(entskb,
-                                                           phw.hw_addr);
-                phw.hw_addrlen = htons(len);
-                NFA_PUT(skb, NFQA_HWADDR, sizeof(phw), &phw);
+                int len = dev_parse_header(entskb, phw.hw_addr);
+                if (len) {
+                        phw.hw_addrlen = htons(len);
+                        NFA_PUT(skb, NFQA_HWADDR, sizeof(phw), &phw);
+                }
         }
 
         if (entskb->tstamp.tv64) {
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index c5244b309640..c9ee343c2a6c 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -519,10 +519,8 @@ static int packet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet
                 sll->sll_ifindex = orig_dev->ifindex;
         else
                 sll->sll_ifindex = dev->ifindex;
-        sll->sll_halen = 0;
 
-        if (dev->hard_header_parse)
-                sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr);
+        sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
 
         PACKET_SKB_CB(skb)->origlen = skb->len;
 
@@ -658,9 +656,7 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packe
         h->tp_usec = tv.tv_usec;
 
         sll = (struct sockaddr_ll*)((u8*)h + TPACKET_ALIGN(sizeof(*h)));
-        sll->sll_halen = 0;
-        if (dev->hard_header_parse)
-                sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr);
+        sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
         sll->sll_family = AF_PACKET;
         sll->sll_hatype = dev->type;
         sll->sll_protocol = skb->protocol;