[NET]: Move hardware header operations out of netdevice.

Since hardware header operations are part of the protocol class
not the device instance, make them into a separate object and
save memory.

Signed-off-by: Stephen Hemminger <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/ieee1394/eth1394.c

···
 
 
 static int ether1394_header(struct sk_buff *skb, struct net_device *dev,
-			    unsigned short type, void *daddr, void *saddr,
-			    unsigned len);
+			    unsigned short type, const void *daddr,
+			    const void *saddr, unsigned len);
 static int ether1394_rebuild_header(struct sk_buff *skb);
 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 int ether1394_header_cache(const struct neighbour *neigh,
+				  struct hh_cache *hh);
 static void ether1394_header_cache_update(struct hh_cache *hh,
-					  struct net_device *dev,
-					  unsigned char *haddr);
+					  const struct net_device *dev,
+					  const unsigned char *haddr);
 static int ether1394_tx(struct sk_buff *skb, struct net_device *dev);
 static void ether1394_iso(struct hpsb_iso *iso);
 
···
 	spin_unlock_irqrestore(&priv->lock, flags);
 }
 
+static const struct header_ops ether1394_header_ops = {
+	.create		= ether1394_header,
+	.rebuild	= ether1394_rebuild_header,
+	.cache  	= ether1394_header_cache,
+	.cache_update	= ether1394_header_cache_update,
+	.parse		= ether1394_header_parse,
+};
+
 static void ether1394_init_dev(struct net_device *dev)
 {
 	dev->open		= ether1394_open;
···
 	dev->tx_timeout		= ether1394_tx_timeout;
 	dev->change_mtu		= ether1394_change_mtu;
 
-	dev->hard_header	= ether1394_header;
-	dev->rebuild_header	= ether1394_rebuild_header;
-	dev->hard_header_cache	= ether1394_header_cache;
-	dev->header_cache_update= ether1394_header_cache_update;
-	dev->hard_header_parse	= ether1394_header_parse;
+	dev->header_ops		= &ether1394_header_ops;
 
 	SET_ETHTOOL_OPS(dev, &ethtool_ops);
 
···
  * saddr=NULL means use device source address
  * daddr=NULL means leave destination address (eg unresolved arp). */
 static int ether1394_header(struct sk_buff *skb, struct net_device *dev,
-			    unsigned short type, void *daddr, void *saddr,
-			    unsigned len)
+			    unsigned short type, const void *daddr,
+			    const void *saddr, unsigned len)
 {
 	struct eth1394hdr *eth =
 			(struct eth1394hdr *)skb_push(skb, ETH1394_HLEN);
···
 	return ETH1394_ALEN;
 }
 
-static int ether1394_header_cache(struct neighbour *neigh, struct hh_cache *hh)
+static int ether1394_header_cache(const struct neighbour *neigh,
+				  struct hh_cache *hh)
 {
 	unsigned short type = hh->hh_type;
 	struct net_device *dev = neigh->dev;
···
 
 /* Called by Address Resolution module to notify changes in address. */
 static void ether1394_header_cache_update(struct hh_cache *hh,
-					  struct net_device *dev,
-					  unsigned char * haddr)
+					  const struct net_device *dev,
+					  const unsigned char * haddr)
 {
 	memcpy((u8 *)hh->hh_data + 16 - ETH1394_HLEN, haddr, dev->addr_len);
 }
···
 	}
 
 	/* Now add the ethernet header. */
-	if (dev->hard_header(skb, dev, ntohs(ether_type), &dest_hw, NULL,
-			     skb->len) >= 0)
+	if (dev_hard_header(skb, dev, ntohs(ether_type), &dest_hw, NULL,
+			    skb->len) >= 0)
 		ret = ether1394_type_trans(skb, dev);
 
 	return ret;

drivers/infiniband/ulp/ipoib/ipoib_main.c

···
 static int ipoib_hard_header(struct sk_buff *skb,
 			     struct net_device *dev,
 			     unsigned short type,
-			     void *daddr, void *saddr, unsigned len)
+			     const void *daddr, const void *saddr, unsigned len)
 {
 	struct ipoib_header *header;
 
···
 	priv->tx_ring = NULL;
 }
 
+static const struct header_ops ipoib_header_ops = {
+	.create	= ipoib_hard_header,
+};
+
 static void ipoib_setup(struct net_device *dev)
 {
 	struct ipoib_dev_priv *priv = netdev_priv(dev);
···
 	dev->hard_start_xmit 	 = ipoib_start_xmit;
 	dev->get_stats 		 = ipoib_get_stats;
 	dev->tx_timeout 	 = ipoib_timeout;
-	dev->hard_header 	 = ipoib_hard_header;
+	dev->header_ops 	 = &ipoib_header_ops;
 	dev->set_multicast_list  = ipoib_set_mcast_list;
 	dev->neigh_setup         = ipoib_neigh_setup_dev;
 

drivers/isdn/i4l/isdn_net.c

···
 	return 0;
 }
 
-static int
-my_eth_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
-	      void *daddr, void *saddr, unsigned len)
-{
-	struct ethhdr *eth = (struct ethhdr *) skb_push(skb, ETH_HLEN);
-
-	/*
-	 * Set the protocol type. For a packet of type ETH_P_802_3 we
-	 * put the length here instead. It is up to the 802.2 layer to
-	 * carry protocol information.
-	 */
-
-	if (type != ETH_P_802_3)
-		eth->h_proto = htons(type);
-	else
-		eth->h_proto = htons(len);
-
-	/*
-	 * Set the source hardware address.
-	 */
-	if (saddr)
-		memcpy(eth->h_source, saddr, dev->addr_len);
-	else
-		memcpy(eth->h_source, dev->dev_addr, dev->addr_len);
-
-	/*
-	 * Anyway, the loopback-device should never use this function...
-	 */
-
-	if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) {
-		memset(eth->h_dest, 0, dev->addr_len);
-		return ETH_HLEN /*(dev->hard_header_len)*/;
-	}
-	if (daddr) {
-		memcpy(eth->h_dest, daddr, dev->addr_len);
-		return ETH_HLEN /*dev->hard_header_len*/;
-	}
-	return -ETH_HLEN /*dev->hard_header_len*/;
-}
-
 /*
  *  build an header
  *  depends on encaps that is being used.
  */
 
-static int
-isdn_net_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
-		void *daddr, void *saddr, unsigned plen)
+static int isdn_net_header(struct sk_buff *skb, struct net_device *dev,
+			   unsigned short type,
+			   const void *daddr, const void *saddr, unsigned plen)
 {
 	isdn_net_local *lp = dev->priv;
 	unsigned char *p;
···
 
 	switch (lp->p_encap) {
 		case ISDN_NET_ENCAP_ETHER:
-			len = my_eth_header(skb, dev, type, daddr, saddr, plen);
+			len = eth_header(skb, dev, type, daddr, saddr, plen);
 			break;
 #ifdef CONFIG_ISDN_PPP
 		case ISDN_NET_ENCAP_SYNCPPP:
···
 	return ret;
 }
 
+static int isdn_header_cache(const struct neighbour *neigh, struct hh_cache *hh)
+{
+	const struct net_device *dev = neigh->dev;
+	isdn_net_local *lp = dev->priv;
+
+	if (lp->p_encap == ISDN_NET_ENCAP_ETHER)
+		return eth_header_cache(neigh, hh);
+	return -1;
+}
+
+static void isdn_header_cache_update(struct hh_cache *hh,
+				     const struct net_device *dev,
+				     const unsigned char *haddr)
+{
+	isdn_net_local *lp = dev->priv;
+	if (lp->p_encap == ISDN_NET_ENCAP_ETHER)
+		return eth_header_cache_update(hh, dev, haddr);
+}
+
+static const struct header_ops isdn_header_ops = {
+	.create = isdn_net_header,
+	.rebuild = isdn_net_rebuild_header,
+	.cache = isdn_header_cache,
+	.cache_update = isdn_header_cache_update,
+};
+
 /*
  * Interface-setup. (just after registering a new interface)
  */
···
 isdn_net_init(struct net_device *ndev)
 {
 	ushort max_hlhdr_len = 0;
-	isdn_net_local *lp = (isdn_net_local *) ndev->priv;
-	int drvidx, i;
+	int drvidx;
 
 	ether_setup(ndev);
-	lp->org_hhc = ndev->hard_header_cache;
-	lp->org_hcu = ndev->header_cache_update;
+	ndev->header_ops = NULL;
 
 	/* Setup the generic properties */
-
-	ndev->hard_header = NULL;
-	ndev->hard_header_cache = NULL;
-	ndev->header_cache_update = NULL;
 	ndev->mtu = 1500;
 	ndev->flags = IFF_NOARP|IFF_POINTOPOINT;
 	ndev->type = ARPHRD_ETHER;
···
 
 	/* for clients with MPPP maybe higher values better */
 	ndev->tx_queue_len = 30;
-
-	for (i = 0; i < ETH_ALEN; i++)
-		ndev->broadcast[i] = 0xff;
 
 	/* The ISDN-specific entries in the device structure. */
 	ndev->open = &isdn_net_open;
···
 	ndev->hard_header_len = ETH_HLEN + max_hlhdr_len;
 	ndev->stop = &isdn_net_close;
 	ndev->get_stats = &isdn_net_get_stats;
-	ndev->rebuild_header = &isdn_net_rebuild_header;
 	ndev->do_ioctl = NULL;
 	return 0;
 }
···
 		}
 		if (cfg->p_encap != lp->p_encap) {
 			if (cfg->p_encap == ISDN_NET_ENCAP_RAWIP) {
-				p->dev.hard_header = NULL;
-				p->dev.hard_header_cache = NULL;
-				p->dev.header_cache_update = NULL;
+				p->dev.header_ops = NULL;
 				p->dev.flags = IFF_NOARP|IFF_POINTOPOINT;
 			} else {
-				p->dev.hard_header = isdn_net_header;
-				if (cfg->p_encap == ISDN_NET_ENCAP_ETHER) {
-					p->dev.hard_header_cache = lp->org_hhc;
-					p->dev.header_cache_update = lp->org_hcu;
+				p->dev.header_ops = &isdn_header_ops;
+				if (cfg->p_encap == ISDN_NET_ENCAP_ETHER)
 					p->dev.flags = IFF_BROADCAST | IFF_MULTICAST;
-				} else {
-					p->dev.hard_header_cache = NULL;
-					p->dev.header_cache_update = NULL;
+				else
 					p->dev.flags = IFF_NOARP|IFF_POINTOPOINT;
-				}
 			}
 		}
 		lp->p_encap = cfg->p_encap;
···
 			((isdn_net_local *) (p->local->master->priv))->slave = p->local->slave;
 	} else {
 		/* Unregister only if it's a master-device */
-		p->dev.hard_header_cache = p->local->org_hhc;
-		p->dev.header_cache_update = p->local->org_hcu;
 		unregister_netdev(&p->dev);
 	}
 	/* Unlink device from chain */

drivers/media/dvb/dvb-core/dvb_net.c

···
 	return &((struct dvb_net_priv*) dev->priv)->stats;
 }
 
+static const struct header_ops dvb_header_ops = {
+	.create		= eth_header,
+	.parse		= eth_header_parse,
+	.rebuild	= eth_rebuild_header,
+};
+
 static void dvb_net_setup(struct net_device *dev)
 {
 	ether_setup(dev);
 
+	dev->header_ops		= &dvb_header_ops;
 	dev->open		= dvb_net_open;
 	dev->stop		= dvb_net_stop;
 	dev->hard_start_xmit	= dvb_net_tx;
···
 	dev->set_mac_address    = dvb_net_set_mac;
 	dev->mtu		= 4096;
 	dev->mc_count           = 0;
-	dev->hard_header_cache  = NULL;
+
 	dev->flags |= IFF_NOARP;
 }
 

drivers/net/appletalk/cops.c

···
 static void cops_rx (struct net_device *dev);
 static int  cops_send_packet (struct sk_buff *skb, struct net_device *dev);
 static void set_multicast_list (struct net_device *dev);
-static int  cops_hard_header (struct sk_buff *skb, struct net_device *dev,
-			      unsigned short type, void *daddr, void *saddr, 
-			      unsigned len);
-
 static int  cops_ioctl (struct net_device *dev, struct ifreq *rq, int cmd);
 static int  cops_close (struct net_device *dev);
 static struct net_device_stats *cops_get_stats (struct net_device *dev);
···
 	dev->base_addr = ioaddr;
 
         lp = netdev_priv(dev);
-        memset(lp, 0, sizeof(struct cops_local));
         spin_lock_init(&lp->lock);
 
 	/* Copy local board variable to lp struct. */
···
 	dev->hard_start_xmit    = cops_send_packet;
 	dev->tx_timeout		= cops_timeout;
 	dev->watchdog_timeo	= HZ * 2;
-	dev->hard_header	= cops_hard_header;
+
         dev->get_stats          = cops_get_stats;
 	dev->open               = cops_open;
         dev->stop               = cops_close;
···
 {
         if(cops_debug >= 3)
 		printk("%s: set_multicast_list executed\n", dev->name);
-}
-
-/*
- *      Another Dummy function to keep the Appletalk layer happy.
- */
- 
-static int cops_hard_header(struct sk_buff *skb, struct net_device *dev,
-			    unsigned short type, void *daddr, void *saddr, 
-			    unsigned len)
-{
-        if(cops_debug >= 3)
-                printk("%s: cops_hard_header executed. Wow!\n", dev->name);
-        return 0;
 }
 
 /*

drivers/net/appletalk/ltpc.c

···
 	/* Actually netatalk needs fixing! */
 }
 
-static int ltpc_hard_header (struct sk_buff *skb, struct net_device *dev, 
-	unsigned short type, void *daddr, void *saddr, unsigned len)
-{
-	if(debug & DEBUG_VERBOSE)
-		printk("ltpc_hard_header called for device %s\n",
-			dev->name);
-	return 0;
-}
-
 static int ltpc_poll_counter;
 
 static void ltpc_poll(unsigned long l)
···
 
 	/* Fill in the fields of the device structure with ethernet-generic values. */
 	dev->hard_start_xmit = ltpc_xmit;
-	dev->hard_header = ltpc_hard_header;
 	dev->get_stats = ltpc_get_stats;
 
 	/* add the ltpc-specific things */

drivers/net/arcnet/arcnet.c

···
 static int arcnet_send_packet(struct sk_buff *skb, struct net_device *dev);
 static void arcnet_timeout(struct net_device *dev);
 static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
-			 unsigned short type, void *daddr, void *saddr,
-			 unsigned len);
+			 unsigned short type, const void *daddr,
+			 const void *saddr, unsigned len);
 static int arcnet_rebuild_header(struct sk_buff *skb);
 static struct net_device_stats *arcnet_get_stats(struct net_device *dev);
 static int go_tx(struct net_device *dev);
···
 	return mtu == 65535 ? XMTU : mtu;
 }
 
+static const struct header_ops arcnet_header_ops = {
+	.create = arcnet_header,
+	.rebuild = arcnet_rebuild_header,
+};
+
 
 /* Setup a struct device for ARCnet. */
 static void arcdev_setup(struct net_device *dev)
 {
 	dev->type = ARPHRD_ARCNET;
+	dev->header_ops = &arcnet_header_ops;
 	dev->hard_header_len = sizeof(struct archdr);
 	dev->mtu = choose_mtu();
 
···
 	dev->hard_start_xmit = arcnet_send_packet;
 	dev->tx_timeout = arcnet_timeout;
 	dev->get_stats = arcnet_get_stats;
-	dev->hard_header = arcnet_header;
-	dev->rebuild_header = arcnet_rebuild_header;
 }
 
 struct net_device *alloc_arcdev(char *name)
···
 
 
 static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
-			 unsigned short type, void *daddr, void *saddr,
-			 unsigned len)
+			 unsigned short type, const void *daddr,
+			 const void *saddr, unsigned len)
 {
-	struct arcnet_local *lp = dev->priv;
+	const struct arcnet_local *lp = netdev_priv(dev);
 	uint8_t _daddr, proto_num;
 	struct ArcProto *proto;
 

drivers/net/hamradio/6pack.c

···
 
 /* Return the frame type ID */
 static int sp_header(struct sk_buff *skb, struct net_device *dev,
-	unsigned short type, void *daddr, void *saddr, unsigned len)
+		     unsigned short type, const void *daddr,
+		     const void *saddr, unsigned len)
 {
 #ifdef CONFIG_INET
 	if (type != htons(ETH_P_AX25))
···
 #endif
 }
 
+static const struct header_ops sp_header_ops = {
+	.create		= sp_header,
+	.rebuild	= sp_rebuild_header,
+};
+
 static void sp_setup(struct net_device *dev)
 {
 	/* Finish setting up the DEVICE info. */
···
 	dev->open		= sp_open_dev;
 	dev->destructor		= free_netdev;
 	dev->stop		= sp_close;
-	dev->hard_header	= sp_header;
+
 	dev->get_stats	        = sp_get_stats;
 	dev->set_mac_address    = sp_set_mac_address;
 	dev->hard_header_len	= AX25_MAX_HEADER_LEN;
+	dev->header_ops 	= &sp_header_ops;
+
 	dev->addr_len		= AX25_ADDR_LEN;
 	dev->type		= ARPHRD_AX25;
 	dev->tx_queue_len	= 10;
-	dev->rebuild_header	= sp_rebuild_header;
 	dev->tx_timeout		= NULL;
 
 	/* Only activated in AX.25 mode */

drivers/net/hamradio/baycom_epp.c

···
 	/* Fill in the fields of the device structure */
 	bc->skb = NULL;
 	
-	dev->hard_header = ax25_hard_header;
-	dev->rebuild_header = ax25_rebuild_header;
+	dev->header_ops = &ax25_header_ops;
 	dev->set_mac_address = baycom_set_mac_address;
 	
 	dev->type = ARPHRD_AX25;           /* AF_AX25 device */

drivers/net/hamradio/bpqether.c

···
 	dev->flags      = 0;
 
 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
-	dev->hard_header     = ax25_hard_header;
-	dev->rebuild_header  = ax25_rebuild_header;
+	dev->header_ops      = &ax25_header_ops;
 #endif
 
 	dev->type            = ARPHRD_AX25;

drivers/net/hamradio/dmascc.c

···
 		dev->do_ioctl = scc_ioctl;
 		dev->hard_start_xmit = scc_send_packet;
 		dev->get_stats = scc_get_stats;
-		dev->hard_header = ax25_hard_header;
-		dev->rebuild_header = ax25_rebuild_header;
+		dev->header_ops = &ax25_header_ops;
 		dev->set_mac_address = scc_set_mac_address;
 	}
 	if (register_netdev(info->dev[0])) {

drivers/net/hamradio/hdlcdrv.c

···
 
 	s->skb = NULL;
 	
-	dev->hard_header = ax25_hard_header;
-	dev->rebuild_header = ax25_rebuild_header;
+	dev->header_ops = &ax25_header_ops;
 	dev->set_mac_address = hdlcdrv_set_mac_address;
 	
 	dev->type = ARPHRD_AX25;           /* AF_AX25 device */

drivers/net/hamradio/mkiss.c

···
 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
 
 /* Return the frame type ID */
-static int ax_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
-	  void *daddr, void *saddr, unsigned len)
+static int ax_header(struct sk_buff *skb, struct net_device *dev,
+		     unsigned short type, const void *daddr,
+		     const void *saddr, unsigned len)
 {
 #ifdef CONFIG_INET
 	if (type != htons(ETH_P_AX25))
···
 	return &ax->stats;
 }
 
+static const struct header_ops ax_header_ops = {
+	.create    = ax_header,
+	.rebuild   = ax_rebuild_header,
+};
+
 static void ax_setup(struct net_device *dev)
 {
 	/* Finish setting up the DEVICE info. */
···
 	dev->addr_len        = 0;
 	dev->type            = ARPHRD_AX25;
 	dev->tx_queue_len    = 10;
-	dev->hard_header     = ax_header;
-	dev->rebuild_header  = ax_rebuild_header;
+	dev->header_ops      = &ax_header_ops;
+
 
 	memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
 	memcpy(dev->dev_addr,  &ax25_defaddr,  AX25_ADDR_LEN);

drivers/net/hamradio/scc.c

···
 	dev->stop	     = scc_net_close;
 
 	dev->hard_start_xmit = scc_net_tx;
-	dev->hard_header     = ax25_hard_header;
-	dev->rebuild_header  = ax25_rebuild_header;
+	dev->header_ops      = &ax25_header_ops;
+
 	dev->set_mac_address = scc_net_set_mac_address;
 	dev->get_stats       = scc_net_get_stats;
 	dev->do_ioctl        = scc_net_ioctl;

drivers/net/hamradio/yam.c

···
 
 	skb_queue_head_init(&yp->send_queue);
 
-	dev->hard_header = ax25_hard_header;
-	dev->rebuild_header = ax25_rebuild_header;
+	dev->header_ops = &ax25_header_ops;
 
 	dev->set_mac_address = yam_set_mac_address;
 

drivers/net/loopback.c

···
 }
 
 /*
- * The loopback device is special. There is only one instance and
- * it is statically allocated. Don't do this for other devices.
+ * The loopback device is special. There is only one instance.
  */
 static void loopback_setup(struct net_device *dev)
 {
 	dev->get_stats		= &get_stats;
 	dev->mtu		= (16 * 1024) + 20 + 20 + 12;
 	dev->hard_start_xmit	= loopback_xmit;
-	dev->hard_header	= eth_header;
-	dev->hard_header_cache	= eth_header_cache;
-	dev->header_cache_update = eth_header_cache_update;
 	dev->hard_header_len	= ETH_HLEN;	/* 14	*/
 	dev->addr_len		= ETH_ALEN;	/* 6	*/
 	dev->tx_queue_len	= 0;
 	dev->type		= ARPHRD_LOOPBACK;	/* 0x0001*/
-	dev->rebuild_header	= eth_rebuild_header;
 	dev->flags		= IFF_LOOPBACK;
 	dev->features 		= NETIF_F_SG | NETIF_F_FRAGLIST
 #ifdef LOOPBACK_TSO
···
 		| NETIF_F_LLTX
 		| NETIF_F_NETNS_LOCAL,
 	dev->ethtool_ops	= &loopback_ethtool_ops;
+	dev->header_ops		= &eth_header_ops;
 	dev->init = loopback_dev_init;
 	dev->destructor = loopback_dev_free;
 }

drivers/net/macvlan.c

···
 }
 
 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
-			       unsigned short type, void *daddr, void *saddr,
-			       unsigned len)
+			       unsigned short type, const void *daddr,
+			       const void *saddr, unsigned len)
 {
 	const struct macvlan_dev *vlan = netdev_priv(dev);
 	struct net_device *lowerdev = vlan->lowerdev;
···
 	return dev_hard_header(skb, lowerdev, type, daddr,
 			       saddr ? : dev->dev_addr, len);
 }
+
+static const struct header_ops macvlan_hard_header_ops = {
+	.create  	= macvlan_hard_header,
+	.rebuild	= eth_rebuild_header,
+	.parse		= eth_header_parse,
+	.rebuild	= eth_rebuild_header,
+	.cache		= eth_header_cache,
+	.cache_update	= eth_header_cache_update,
+};
 
 static int macvlan_open(struct net_device *dev)
 {
···
 	dev->change_mtu		= macvlan_change_mtu;
 	dev->change_rx_flags	= macvlan_change_rx_flags;
 	dev->set_multicast_list	= macvlan_set_multicast_list;
-	dev->hard_header	= macvlan_hard_header;
 	dev->hard_start_xmit	= macvlan_hard_start_xmit;
 	dev->destructor		= free_netdev;
+	dev->header_ops		= &macvlan_hard_header_ops,
 	dev->ethtool_ops	= &macvlan_ethtool_ops;
 	dev->tx_queue_len	= 0;
 }

drivers/net/myri_sbus.c

···
  * saddr=NULL	means use device source address
  * daddr=NULL	means leave destination address (eg unresolved arp)
  */
-static int myri_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
-		       void *daddr, void *saddr, unsigned len)
+static int myri_header(struct sk_buff *skb, struct net_device *dev,
+		       unsigned short type, const void *daddr,
+		       const void *saddr, unsigned len)
 {
 	struct ethhdr *eth = (struct ethhdr *) skb_push(skb, ETH_HLEN);
 	unsigned char *pad = (unsigned char *) skb_push(skb, MYRI_PAD_LEN);
···
 	return 0;
 }
 
-int myri_header_cache(struct neighbour *neigh, struct hh_cache *hh)
+static int myri_header_cache(const struct neighbour *neigh, struct hh_cache *hh)
 {
 	unsigned short type = hh->hh_type;
 	unsigned char *pad;
 	struct ethhdr *eth;
-	struct net_device *dev = neigh->dev;
+	const struct net_device *dev = neigh->dev;
 
 	pad = ((unsigned char *) hh->hh_data) +
 		HH_DATA_OFF(sizeof(*eth) + MYRI_PAD_LEN);
 	eth = (struct ethhdr *) (pad + MYRI_PAD_LEN);
 
-	if (type == __constant_htons(ETH_P_802_3))
+	if (type == htons(ETH_P_802_3))
 		return -1;
 
 	/* Refill MyriNet padding identifiers, this is just being anal. */
···
 
 
 /* Called by Address Resolution module to notify changes in address. */
-void myri_header_cache_update(struct hh_cache *hh, struct net_device *dev, unsigned char * haddr)
+void myri_header_cache_update(struct hh_cache *hh,
+			      const struct net_device *dev,
+			      const unsigned char * haddr)
 {
 	memcpy(((u8*)hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)),
 	       haddr, dev->addr_len);
···
 	printk("EEPROM: serial_num[%08x]\n", mp->eeprom.serial_num);
 }
 #endif
+
+static const struct header_ops myri_header_ops = {
+	.create		= myri_header,
+	.rebuild	= myri_rebuild_header,
+	.cache	 	= myri_header_cache,
+	.cache_update	= myri_header_cache_update,
+};
 
 static int __devinit myri_ether_init(struct sbus_dev *sdev)
 {
···
 
 	dev->mtu		= MYRINET_MTU;
 	dev->change_mtu		= myri_change_mtu;
-	dev->hard_header	= myri_header;
-	dev->rebuild_header	= myri_rebuild_header;
+	dev->header_ops		= &myri_header_ops;
+
 	dev->hard_header_len	= (ETH_HLEN + MYRI_PAD_LEN);
-	dev->hard_header_cache 	= myri_header_cache;
-	dev->header_cache_update= myri_header_cache_update;
 
 	/* Load code onto the LANai. */
 	DET(("Loading LANAI firmware\n"));

drivers/net/plip.c

···
 /* Functions for DEV methods */
 static int plip_tx_packet(struct sk_buff *skb, struct net_device *dev);
 static int plip_hard_header(struct sk_buff *skb, struct net_device *dev,
-                            unsigned short type, void *daddr,
-                            void *saddr, unsigned len);
-static int plip_hard_header_cache(struct neighbour *neigh,
+                            unsigned short type, const void *daddr,
+			    const void *saddr, unsigned len);
+static int plip_hard_header_cache(const struct neighbour *neigh,
                                   struct hh_cache *hh);
 static int plip_open(struct net_device *dev);
 static int plip_close(struct net_device *dev);
···
 	int is_deferred;
 	int port_owner;
 	int should_relinquish;
-	int (*orig_hard_header)(struct sk_buff *skb, struct net_device *dev,
-	                        unsigned short type, void *daddr,
-	                        void *saddr, unsigned len);
-	int (*orig_hard_header_cache)(struct neighbour *neigh,
-	                              struct hh_cache *hh);
 	spinlock_t lock;
 	atomic_t kill_timer;
 	struct semaphore killed_timer_sem;
···
 	return port->ops->read_status (port);
 }
 
+static const struct header_ops plip_header_ops = {
+	.create	= plip_hard_header,
+	.cache  = plip_hard_header_cache,
+};
+
 /* Entry point of PLIP driver.
    Probe the hardware, and register/initialize the driver.
 
···
 	dev->open		 = plip_open;
 	dev->stop		 = plip_close;
 	dev->do_ioctl		 = plip_ioctl;
-	dev->header_cache_update = NULL;
+
 	dev->tx_queue_len 	 = 10;
 	dev->flags	         = IFF_POINTOPOINT|IFF_NOARP;
 	memset(dev->dev_addr, 0xfc, ETH_ALEN);
 
-	/* Set the private structure */
-	nl->orig_hard_header    = dev->hard_header;
-	dev->hard_header        = plip_hard_header;
-
-	nl->orig_hard_header_cache = dev->hard_header_cache;
-	dev->hard_header_cache     = plip_hard_header_cache;
+	dev->header_ops          = &plip_header_ops;
 
 
 	nl->port_owner = 0;
···
 }
 
 static void
-plip_rewrite_address(struct net_device *dev, struct ethhdr *eth)
+plip_rewrite_address(const struct net_device *dev, struct ethhdr *eth)
 {
-	struct in_device *in_dev;
+	const struct in_device *in_dev = dev->ip_ptr;
 
-	if ((in_dev=dev->ip_ptr) != NULL) {
+	if (in_dev) {
 		/* Any address will do - we take the first */
-		struct in_ifaddr *ifa=in_dev->ifa_list;
-		if (ifa != NULL) {
+		const struct in_ifaddr *ifa = in_dev->ifa_list;
+		if (ifa) {
 			memcpy(eth->h_source, dev->dev_addr, 6);
 			memset(eth->h_dest, 0xfc, 2);
 			memcpy(eth->h_dest+2, &ifa->ifa_address, 4);
···
 
 static int
 plip_hard_header(struct sk_buff *skb, struct net_device *dev,
-                 unsigned short type, void *daddr,
-	         void *saddr, unsigned len)
+		 unsigned short type, const void *daddr,
+		 const void *saddr, unsigned len)
 {
-	struct net_local *nl = netdev_priv(dev);
 	int ret;
 
-	if ((ret = nl->orig_hard_header(skb, dev, type, daddr, saddr, len)) >= 0)
+	ret = eth_header(skb, dev, type, daddr, saddr, len);
+	if (ret >= 0)
 		plip_rewrite_address (dev, (struct ethhdr *)skb->data);
 
 	return ret;
 }
 
-int plip_hard_header_cache(struct neighbour *neigh,
+int plip_hard_header_cache(const struct neighbour *neigh,
                            struct hh_cache *hh)
 {
-	struct net_local *nl = neigh->dev->priv;
 	int ret;
 
-	if ((ret = nl->orig_hard_header_cache(neigh, hh)) == 0)
-	{
+	ret = eth_header_cache(neigh, hh);
+	if (ret == 0) {
 		struct ethhdr *eth;
 
 		eth = (struct ethhdr*)(((u8*)hh->hh_data) +

drivers/net/shaper.c

···
  */
 
 static int shaper_header(struct sk_buff *skb, struct net_device *dev,
-	unsigned short type, void *daddr, void *saddr, unsigned len)
+			 unsigned short type,
+			 const void *daddr, const void *saddr, unsigned len)
 {
 	struct shaper *sh=dev->priv;
 	int v;
 	if(sh_debug)
 		printk("Shaper header\n");
-	skb->dev=sh->dev;
-	v=sh->hard_header(skb,sh->dev,type,daddr,saddr,len);
-	skb->dev=dev;
+	skb->dev = sh->dev;
+	v = dev_hard_header(skb, sh->dev, type, daddr, saddr, len);
+	skb->dev = dev;
 	return v;
 }
 
···
 	if(sh_debug)
 		printk("Shaper rebuild header\n");
 	skb->dev=sh->dev;
-	v=sh->rebuild_header(skb);
+	v = sh->dev->header_ops->rebuild(skb);
 	skb->dev=dev;
 	return v;
 }
···
 
 #endif
 
+static const struct header_ops shaper_ops = {
+	.create	 = shaper_header,
+	.rebuild = shaper_rebuild_header,
+};
+
 static int shaper_attach(struct net_device *shdev, struct shaper *sh, struct net_device *dev)
 {
 	sh->dev = dev;
-	sh->hard_start_xmit=dev->hard_start_xmit;
 	sh->get_stats=dev->get_stats;
-	if(dev->hard_header)
-	{
-		sh->hard_header=dev->hard_header;
-		shdev->hard_header = shaper_header;
-	}
-	else
-		shdev->hard_header = NULL;
 
-	if(dev->rebuild_header)
-	{
-		sh->rebuild_header	= dev->rebuild_header;
-		shdev->rebuild_header	= shaper_rebuild_header;
-	}
-	else
-		shdev->rebuild_header	= NULL;
-
-#if 0
-	if(dev->hard_header_cache)
-	{
-		sh->hard_header_cache	= dev->hard_header_cache;
-		shdev->hard_header_cache= shaper_cache;
-	}
-	else
-	{
-		shdev->hard_header_cache= NULL;
-	}
-
-	if(dev->header_cache_update)
-	{
-		sh->header_cache_update	= dev->header_cache_update;
-		shdev->header_cache_update = shaper_cache_update;
-	}
-	else
-		shdev->header_cache_update= NULL;
-#else
-	shdev->header_cache_update = NULL;
-	shdev->hard_header_cache = NULL;
-#endif
 	shdev->neigh_setup = shaper_neigh_setup_dev;
-
 	shdev->hard_header_len=dev->hard_header_len;
 	shdev->type=dev->type;
 	shdev->addr_len=dev->addr_len;
···
 	 *	Handlers for when we attach to a device.
 	 */
 
-	dev->hard_header 	= shaper_header;
-	dev->rebuild_header 	= shaper_rebuild_header;
-#if 0
-	dev->hard_header_cache	= shaper_cache;
-	dev->header_cache_update= shaper_cache_update;
-#endif
 	dev->neigh_setup	= shaper_neigh_setup_dev;
 	dev->do_ioctl		= shaper_ioctl;
 	dev->hard_header_len	= 0;

drivers/net/skfp/skfddi.c

···
 	dev->set_multicast_list = &skfp_ctl_set_multicast_list;
 	dev->set_mac_address = &skfp_ctl_set_mac_address;
 	dev->do_ioctl = &skfp_ioctl;
-	dev->header_cache_update = NULL;	/* not supported */
 
 	SET_NETDEV_DEV(dev, &pdev->dev);
 

drivers/net/wan/cycx_x25.c

···
 	   cycx_wan_del_if(struct wan_device *wandev, struct net_device *dev);
 
 /* Network device interface */
-static int cycx_netdevice_init(struct net_device *dev),
-	   cycx_netdevice_open(struct net_device *dev),
-	   cycx_netdevice_stop(struct net_device *dev),
-	   cycx_netdevice_hard_header(struct sk_buff *skb,
-				     struct net_device *dev, u16 type,
-				     void *daddr, void *saddr, unsigned len),
-	   cycx_netdevice_rebuild_header(struct sk_buff *skb),
-	   cycx_netdevice_hard_start_xmit(struct sk_buff *skb,
+static int cycx_netdevice_init(struct net_device *dev);
+static int cycx_netdevice_open(struct net_device *dev);
+static int cycx_netdevice_stop(struct net_device *dev);
+static int cycx_netdevice_hard_header(struct sk_buff *skb,
+				      struct net_device *dev, u16 type,
+				      const void *daddr, const void *saddr,
+				      unsigned len);
+static int cycx_netdevice_rebuild_header(struct sk_buff *skb);
+static int cycx_netdevice_hard_start_xmit(struct sk_buff *skb,
 					  struct net_device *dev);
 
 static struct net_device_stats *
···
 	return 0;
 }
 
+
 /* Network Device Interface */
+
+static const struct header_ops cycx_header_ops = {
+	.create = cycx_netdevice_hard_header,
+	.rebuild = cycx_netdevice_rebuild_header,
+};
+
 /* Initialize Linux network interface.
  *
  * This routine is called only once for each interface, during Linux network
···
 	/* Initialize device driver entry points */
 	dev->open		= cycx_netdevice_open;
 	dev->stop		= cycx_netdevice_stop;
-	dev->hard_header	= cycx_netdevice_hard_header;
-	dev->rebuild_header	= cycx_netdevice_rebuild_header;
+	dev->header_ops		= &cycx_header_ops;
+
 	dev->hard_start_xmit	= cycx_netdevice_hard_start_xmit;
 	dev->get_stats		= cycx_netdevice_get_stats;
 
···
  * Return:	media header length. */
 static int cycx_netdevice_hard_header(struct sk_buff *skb,
 				      struct net_device *dev, u16 type,
-				      void *daddr, void *saddr, unsigned len)
+				      const void *daddr, const void *saddr,
+				      unsigned len)
 {
 	skb->protocol = type;
 

drivers/net/wan/dlci.c

···
  */
 
 static int dlci_header(struct sk_buff *skb, struct net_device *dev, 
-                           unsigned short type, void *daddr, void *saddr, 
-                           unsigned len)
+		       unsigned short type, const void *daddr,
+		       const void *saddr, unsigned len)
 {
 	struct frhdr		hdr;
 	struct dlci_local	*dlp;
···
 	return(err);
 }
 
+static const struct header_ops dlci_header_ops = {
+	.create	= dlci_header,
+};
+
 static void dlci_setup(struct net_device *dev)
 {
 	struct dlci_local *dlp = dev->priv;
···
 	dev->stop		= dlci_close;
 	dev->do_ioctl		= dlci_dev_ioctl;
 	dev->hard_start_xmit	= dlci_transmit;
-	dev->hard_header	= dlci_header;
+	dev->header_ops		= &dlci_header_ops;
 	dev->get_stats		= dlci_get_stats;
 	dev->change_mtu		= dlci_change_mtu;
 	dev->destructor		= free_netdev;

drivers/net/wan/hdlc.c

···
 	return -EINVAL;
 }
 
+static const struct header_ops hdlc_null_ops;
+
 static void hdlc_setup_dev(struct net_device *dev)
 {
 	/* Re-init all variables changed by HDLC protocol drivers,
···
 	dev->type		 = ARPHRD_RAWHDLC;
 	dev->hard_header_len	 = 16;
 	dev->addr_len		 = 0;
-	dev->hard_header	 = NULL;
-	dev->rebuild_header	 = NULL;
-	dev->set_mac_address	 = NULL;
-	dev->hard_header_cache	 = NULL;
-	dev->header_cache_update = NULL;
+	dev->header_ops		 = &hdlc_null_ops;
+
 	dev->change_mtu		 = hdlc_change_mtu;
-	dev->hard_header_parse	 = NULL;
 }
 
 static void hdlc_setup(struct net_device *dev)

drivers/net/wan/hdlc_cisco.c

···
 
 
 static int cisco_hard_header(struct sk_buff *skb, struct net_device *dev,
-			     u16 type, void *daddr, void *saddr,
+			     u16 type, const void *daddr, const void *saddr,
 			     unsigned int len)
 {
 	struct hdlc_header *data;
···
 }
 
 
-
 static struct hdlc_proto proto = {
 	.start		= cisco_start,
 	.stop		= cisco_stop,
···
 	.ioctl		= cisco_ioctl,
 	.module		= THIS_MODULE,
 };
- 
+
+static const struct header_ops cisco_header_ops = {
+	.create = cisco_hard_header,
+};
  
 static int cisco_ioctl(struct net_device *dev, struct ifreq *ifr)
 {
···
 
 		memcpy(&state(hdlc)->settings, &new_settings, size);
 		dev->hard_start_xmit = hdlc->xmit;
-		dev->hard_header = cisco_hard_header;
+		dev->header_ops = &cisco_header_ops;
 		dev->type = ARPHRD_CISCO;
 		netif_dormant_on(dev);
 		return 0;

drivers/net/wan/hdlc_ppp.c

···
 
 	sppp_close(dev);
 	sppp_detach(dev);
-	dev->rebuild_header = NULL;
+
 	dev->change_mtu = state(hdlc)->old_change_mtu;
 	dev->mtu = HDLC_MAX_MTU;
 	dev->hard_header_len = 16;

drivers/net/wan/lmc/lmc_proto.c

···
              * They set a few basics because they don't use sync_ppp
              */
             dev->flags |= IFF_POINTOPOINT;
-            dev->hard_header = NULL;
+
             dev->hard_header_len = 0;
             dev->addr_len = 0;
         }

drivers/net/wan/syncppp.c

···
  *	Handle transmit packets.
  */
  
-static int sppp_hard_header(struct sk_buff *skb, struct net_device *dev, __u16 type,
-		void *daddr, void *saddr, unsigned int len)
+static int sppp_hard_header(struct sk_buff *skb,
+			    struct net_device *dev, __u16 type,
+			    const void *daddr, const void *saddr,
+			    unsigned int len)
 {
 	struct sppp *sp = (struct sppp *)sppp_of(dev);
 	struct ppp_header *h;
···
 	return sizeof(struct ppp_header);
 }
 
-static int sppp_rebuild_header(struct sk_buff *skb)
-{
-	return 0;
-}
+static const struct header_ops sppp_header_ops = {
+	.create = sppp_hard_header,
+};
 
 /*
  * Send keepalive packets, every 10 seconds.
···
 	 *	hard_start_xmit.
 	 */
 	 
-	dev->hard_header = sppp_hard_header;
-	dev->rebuild_header = sppp_rebuild_header;
+	dev->header_ops = &sppp_header_ops;
+
 	dev->tx_queue_len = 10;
 	dev->type = ARPHRD_HDLC;
 	dev->addr_len = 0;
···
 	dev->stop = sppp_close;
 #endif	
 	dev->change_mtu = sppp_change_mtu;
-	dev->hard_header_cache = NULL;
-	dev->header_cache_update = NULL;
 	dev->flags = IFF_MULTICAST|IFF_POINTOPOINT|IFF_NOARP;
 }
 

drivers/net/wireless/airo.c

···
 	return rc;
 }
 
+static const struct header_ops airo_header_ops = {
+	.parse = wll_header_parse,
+};
+
 static void wifi_setup(struct net_device *dev)
 {
-	dev->hard_header_parse  = wll_header_parse;
+	dev->header_ops = &airo_header_ops;
 	dev->hard_start_xmit = &airo_start_xmit11;
 	dev->get_stats = &airo_get_stats;
 	dev->set_mac_address = &airo_set_mac_address;

drivers/net/wireless/hostap/hostap.h

···
 			   const struct hfa384x_rx_frame *rx);
 void hostap_dump_tx_header(const char *name,
 			   const struct hfa384x_tx_frame *tx);
-int hostap_80211_header_parse(struct sk_buff *skb, unsigned char *haddr);
-int hostap_80211_prism_header_parse(struct sk_buff *skb, unsigned char *haddr);
+extern const struct header_ops hostap_80211_ops;
 int hostap_80211_get_hdrlen(u16 fc);
 struct net_device_stats *hostap_get_stats(struct net_device *dev);
 void hostap_setup_dev(struct net_device *dev, local_info_t *local,

drivers/net/wireless/hostap/hostap_hw.c

···
 	INIT_LIST_HEAD(&local->bss_list);
 
 	hostap_setup_dev(dev, local, 1);
-	local->saved_eth_header_parse = dev->hard_header_parse;
 
 	dev->hard_start_xmit = hostap_master_start_xmit;
 	dev->type = ARPHRD_IEEE80211;
-	dev->hard_header_parse = hostap_80211_header_parse;
+	dev->header_ops = &hostap_80211_ops;
 
 	rtnl_lock();
 	ret = dev_alloc_name(dev, "wifi%d");

drivers/net/wireless/hostap/hostap_ioctl.c

···
 	if (local->monitor_type == PRISM2_MONITOR_PRISM ||
 	    local->monitor_type == PRISM2_MONITOR_CAPHDR) {
 		dev->type = ARPHRD_IEEE80211_PRISM;
-		dev->hard_header_parse =
-			hostap_80211_prism_header_parse;
 	} else {
 		dev->type = ARPHRD_IEEE80211;
-		dev->hard_header_parse = hostap_80211_header_parse;
 	}
 }
 
···
 
 	printk(KERN_DEBUG "%s: Disabling monitor mode\n", dev->name);
 	dev->type = ARPHRD_ETHER;
-	dev->hard_header_parse = local->saved_eth_header_parse;
+
 	if (local->func->cmd(dev, HFA384X_CMDCODE_TEST |
 			     (HFA384X_TEST_STOP << 8),
 			     0, NULL, NULL))

drivers/net/wireless/hostap/hostap_main.c

···
 }
 
 
-int hostap_80211_header_parse(struct sk_buff *skb, unsigned char *haddr)
+int hostap_80211_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 {
-	memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
-	return ETH_ALEN;
-}
+	struct hostap_interface *iface = netdev_priv(skb->dev);
+	local_info_t *local = iface->local;
 
+	if (local->monitor_type == PRISM2_MONITOR_PRISM ||
+	    local->monitor_type == PRISM2_MONITOR_CAPHDR) {
+		const unsigned char *mac = skb_mac_header(skb);
 
-int hostap_80211_prism_header_parse(struct sk_buff *skb, unsigned char *haddr)
-{
-	const unsigned char *mac = skb_mac_header(skb);
+		if (*(u32 *)mac == LWNG_CAP_DID_BASE) {
+			memcpy(haddr,
+			       mac + sizeof(struct linux_wlan_ng_prism_hdr) + 10,
+			       ETH_ALEN); /* addr2 */
+		} else { /* (*(u32 *)mac == htonl(LWNG_CAPHDR_VERSION)) */
+			memcpy(haddr,
+			       mac + sizeof(struct linux_wlan_ng_cap_hdr) + 10,
+			       ETH_ALEN); /* addr2 */
+		}
+	} else
+		memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
 
-	if (*(u32 *)mac == LWNG_CAP_DID_BASE) {
-		memcpy(haddr, mac + sizeof(struct linux_wlan_ng_prism_hdr) + 10,
-		       ETH_ALEN); /* addr2 */
-	} else { /* (*(u32 *)mac == htonl(LWNG_CAPHDR_VERSION)) */
-		memcpy(haddr, mac + sizeof(struct linux_wlan_ng_cap_hdr) + 10,
-		       ETH_ALEN); /* addr2 */
-	}
 	return ETH_ALEN;
 }
 
···
 	local->func->schedule_reset(local);
 }
 
+const struct header_ops hostap_80211_ops = {
+	.create		= eth_header,
+	.rebuild	= eth_rebuild_header,
+	.cache		= eth_header_cache,
+	.cache_update	= eth_header_cache_update,
+
+	.parse		= hostap_80211_header_parse,
+};
+EXPORT_SYMBOL(hostap_80211_ops);
 
 void hostap_setup_dev(struct net_device *dev, local_info_t *local,
 		      int main_dev)
···
 	netif_stop_queue(dev);
 }
 
-
 static int hostap_enable_hostapd(local_info_t *local, int rtnl_locked)
 {
 	struct net_device *dev = local->dev;
···
 
 	local->apdev->hard_start_xmit = hostap_mgmt_start_xmit;
 	local->apdev->type = ARPHRD_IEEE80211;
-	local->apdev->hard_header_parse = hostap_80211_header_parse;
+	local->apdev->header_ops = &hostap_80211_ops;
 
 	return 0;
 }

drivers/net/wireless/hostap/hostap_wlan.h

···
 		PRISM2_MONITOR_80211 = 0, PRISM2_MONITOR_PRISM = 1,
 		PRISM2_MONITOR_CAPHDR = 2
 	} monitor_type;
-	int (*saved_eth_header_parse)(struct sk_buff *skb,
-				      unsigned char *haddr);
 	int monitor_allow_fcserr;
 
 	int hostapd; /* whether user space daemon, hostapd, is used for AP

drivers/net/wireless/strip.c

···
  */
 
 static int strip_header(struct sk_buff *skb, struct net_device *dev,
-			unsigned short type, void *daddr, void *saddr,
-			unsigned len)
+			unsigned short type, const void *daddr,
+			const void *saddr, unsigned len)
 {
 	struct strip *strip_info = netdev_priv(dev);
 	STRIP_Header *header = (STRIP_Header *) skb_push(skb, sizeof(STRIP_Header));
···
 	return 0;
 }
 
+static const struct header_ops strip_header_ops = {
+	.create = strip_header,
+	.rebuild = strip_rebuild_header,
+};
+
 /*
  * This routine is called by DDI when the
  * (dynamically assigned) device is registered
···
 	dev->open = strip_open_low;
 	dev->stop = strip_close_low;
 	dev->hard_start_xmit = strip_xmit;
-	dev->hard_header = strip_header;
-	dev->rebuild_header = strip_rebuild_header;
+	dev->header_ops = &strip_header_ops;
+
 	dev->set_mac_address = strip_set_mac_address;
 	dev->get_stats = strip_get_stats;
 	dev->change_mtu = strip_change_mtu;

drivers/s390/net/qeth.h

···
 	struct qeth_qdio_info qdio;
 	struct qeth_perf_stats perf_stats;
 	int use_hard_stop;
-	int (*orig_hard_header)(struct sk_buff *,struct net_device *,
-				unsigned short,void *,void *,unsigned);
+	const struct header_ops *orig_header_ops;
 	struct qeth_osn_info osn_info;
 	atomic_t force_alloc_skb;
 };

drivers/s390/net/qeth_main.c

···
 static void
 qeth_setadp_promisc_mode(struct qeth_card *);
 
+static int
+qeth_hard_header_parse(const struct sk_buff *skb, unsigned char *haddr);
+
 static void
 qeth_notify_processes(void)
 {
···
 /*hard_header fake function; used in case fake_ll is set */
 static int
 qeth_fake_header(struct sk_buff *skb, struct net_device *dev,
-		     unsigned short type, void *daddr, void *saddr,
-		     unsigned len)
+		 unsigned short type, const void *daddr, const void *saddr,
+		 unsigned len)
 {
 	if(dev->type == ARPHRD_IEEE802_TR){
 		struct trh_hdr *hdr;
···
 
 	}
 }
+
+static const struct header_ops qeth_fake_ops = {
+	.create	= qeth_fake_header,
+	.parse  = qeth_hard_header_parse,
+};
 
 static int
 qeth_send_packet(struct qeth_card *, struct sk_buff *);
···
 		[qeth_get_priority_queue(card, skb, ipv, cast_type)];
 	if (!card->options.layer2) {
 		ipv = qeth_get_ip_version(skb);
-		if ((card->dev->hard_header == qeth_fake_header) && ipv) {
+		if ((card->dev->header_ops == &qeth_fake_ops) && ipv) {
 			new_skb = qeth_pskb_unshare(skb, GFP_ATOMIC);
 			if (!new_skb)
 				return -ENOMEM;
···
 	const struct qeth_card *card;
 	const struct ethhdr *eth;
 
+	if (dev->type != ARPHRD_IEEE802_TR)
+		return 0;
+
 	card = qeth_get_card_from_dev(skb->dev);
 	if (card->options.layer2)
 		goto haveheader;
···
 	return ETH_ALEN;
 }
 
+static const struct header_ops qeth_null_ops = {
+	.parse = qeth_hard_header_parse,
+};
+
 static int
 qeth_netdev_init(struct net_device *dev)
 {
···
 	dev->vlan_rx_kill_vid = qeth_vlan_rx_kill_vid;
 	dev->vlan_rx_add_vid = qeth_vlan_rx_add_vid;
 #endif
-	if (qeth_get_netdev_flags(card) & IFF_NOARP) {
-		dev->rebuild_header = NULL;
-		dev->hard_header = NULL;
-		dev->header_cache_update = NULL;
-		dev->hard_header_cache = NULL;
-	}
+	dev->header_ops = &qeth_null_ops;
+
 #ifdef CONFIG_QETH_IPV6
 	/*IPv6 address autoconfiguration stuff*/
 	if (!(card->info.unique_id & UNIQUE_ID_NOT_BY_CARD))
···
 #endif
 	if (card->options.fake_ll &&
 		(qeth_get_netdev_flags(card) & IFF_NOARP))
-			dev->hard_header = qeth_fake_header;
-	if (dev->type == ARPHRD_IEEE802_TR)
-		dev->hard_header_parse = NULL;
-	else
-		dev->hard_header_parse = qeth_hard_header_parse;
+			dev->header_ops = &qeth_fake_ops;
+
 	dev->set_mac_address = qeth_layer2_set_mac_address;
 	dev->flags |= qeth_get_netdev_flags(card);
 	if ((card->options.fake_broadcast) ||
···
 	}
 	/*network device will be recovered*/
 	if (card->dev) {
-		card->dev->hard_header = card->orig_hard_header;
+		card->dev->header_ops = card->orig_header_ops;
 		if (card->options.fake_ll &&
 		    (qeth_get_netdev_flags(card) & IFF_NOARP))
-			card->dev->hard_header = qeth_fake_header;
+			card->dev->header_ops = &qeth_fake_ops;
 		return 0;
 	}
 	/* at first set_online allocate netdev */
···
 		goto out;
 	}
 	card->dev->priv = card;
-	card->orig_hard_header = card->dev->hard_header;
+	card->orig_header_ops = card->dev->header_ops;
 	card->dev->type = qeth_get_arphdr_type(card->info.type,
 					       card->info.link_type);
 	card->dev->init = qeth_netdev_init;
···
 	if (card == NULL)
 		goto out;
 	if((card->options.layer2) ||
-	   (card->dev->hard_header == qeth_fake_header))
+	   (card->dev->header_ops == &qeth_fake_ops))
 		goto out;
 
 	rcu_read_lock();

include/linux/etherdevice.h

···
 #include <linux/random.h>
 
 #ifdef __KERNEL__
-extern int		eth_header(struct sk_buff *skb, struct net_device *dev,
-				   unsigned short type, void *daddr,
-				   void *saddr, unsigned len);
-extern int		eth_rebuild_header(struct sk_buff *skb);
 extern __be16		eth_type_trans(struct sk_buff *skb, struct net_device *dev);
-extern void		eth_header_cache_update(struct hh_cache *hh, struct net_device *dev,
-						unsigned char * haddr);
-extern int		eth_header_cache(struct neighbour *neigh,
-					 struct hh_cache *hh);
+extern const struct header_ops eth_header_ops;
+
+extern int eth_header(struct sk_buff *skb, struct net_device *dev,
+		      unsigned short type,
+		      const void *daddr, const void *saddr, unsigned len);
+extern int eth_rebuild_header(struct sk_buff *skb);
+extern int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr);
+extern int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh);
+extern void eth_header_cache_update(struct hh_cache *hh,
+				    const struct net_device *dev,
+				    const unsigned char *haddr);
+
 
 extern struct net_device *alloc_etherdev_mq(int sizeof_priv, unsigned int queue_count);
 #define alloc_etherdev(sizeof_priv) alloc_etherdev_mq(sizeof_priv, 1)

include/linux/if_ether.h

···
 	return (struct ethhdr *)skb_mac_header(skb);
 }
 
+int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr);
+
 #ifdef CONFIG_SYSCTL
 extern struct ctl_table ether_table[];
 #endif

include/linux/if_shaper.h

···
 				   an empty queue */
 	spinlock_t lock;
 	struct net_device *dev;
-	int  (*hard_start_xmit) (struct sk_buff *skb,
-		struct net_device *dev);
-	int  (*hard_header) (struct sk_buff *skb,
-		struct net_device *dev,
-		unsigned short type,
-		void *daddr,
-		void *saddr,
-		unsigned len);
-	int  (*rebuild_header)(struct sk_buff *skb);
-	int (*hard_header_cache)(struct neighbour *neigh, struct hh_cache *hh);
-	void (*header_cache_update)(struct hh_cache *hh, struct net_device *dev, unsigned char *  haddr);
 	struct net_device_stats* (*get_stats)(struct net_device *dev);
 	struct timer_list timer;
 };

include/linux/isdn.h

···
                                        /* a particular channel (including  */
                                        /* the frame_cnt                    */
 
-  int                    (*org_hhc)(
-				    struct neighbour *neigh,
-				    struct hh_cache *hh);
-                                       /* Ptr to orig. header_cache_update */
-  void                   (*org_hcu)(struct hh_cache *,
-				    struct net_device *,
-                                    unsigned char *);
   int  pppbind;                        /* ippp device for bindings         */
   int					dialtimeout;	/* How long shall we try on dialing? (jiffies) */
   int					dialwait;		/* How long shall we wait after failed attempt? (jiffies) */

include/linux/netdevice.h

···
 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
 	((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 
+struct header_ops {
+	int	(*create) (struct sk_buff *skb, struct net_device *dev,
+			   unsigned short type, const void *daddr,
+			   const void *saddr, unsigned len);
+	int	(*parse)(const struct sk_buff *skb, unsigned char *haddr);
+	int	(*rebuild)(struct sk_buff *skb);
+#define HAVE_HEADER_CACHE
+	int	(*cache)(const struct neighbour *neigh, struct hh_cache *hh);
+	void	(*cache_update)(struct hh_cache *hh,
+				const struct net_device *dev,
+				const unsigned char *haddr);
+};
+
 /* These flag bits are private to the generic network queueing
  * layer, they may not be explicitly referenced by any other
  * code.
···
 #endif
 	const struct ethtool_ops *ethtool_ops;
 
+	/* Hardware header description */
+	const struct header_ops *header_ops;
+
 	/*
 	 * This marks the end of the "visible" part of the structure. All
 	 * fields hereafter are internal to the system, and may change at
···
 	int			(*open)(struct net_device *dev);
 	int			(*stop)(struct net_device *dev);
 #define HAVE_NETDEV_POLL
-	int			(*hard_header) (struct sk_buff *skb,
-						struct net_device *dev,
-						unsigned short type,
-						void *daddr,
-						void *saddr,
-						unsigned len);
-	int			(*rebuild_header)(struct sk_buff *skb);
 #define HAVE_CHANGE_RX_FLAGS
 	void			(*change_rx_flags)(struct net_device *dev,
 						   int flags);
···
 #define HAVE_SET_CONFIG
 	int			(*set_config)(struct net_device *dev,
 					      struct ifmap *map);
-#define HAVE_HEADER_CACHE
-	int			(*hard_header_cache)(struct neighbour *neigh,
-						     struct hh_cache *hh);
-	void			(*header_cache_update)(struct hh_cache *hh,
-						       struct net_device *dev,
-						       unsigned char *  haddr);
 #define HAVE_CHANGE_MTU
 	int			(*change_mtu)(struct net_device *dev, int new_mtu);
 
···
 	void			(*vlan_rx_kill_vid)(struct net_device *dev,
 						    unsigned short vid);
 
-	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
 	struct netpoll_info	*npinfo;
···
 
 static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 				  unsigned short type,
-				  void *daddr, void *saddr, unsigned len)
+				  const void *daddr, const void *saddr,
+				  unsigned len)
 {
-	if (!dev->hard_header)
+	if (!dev->header_ops)
 		return 0;
-	return dev->hard_header(skb, dev, type, daddr, saddr, len);
+
+	return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
 }
 
 static inline int dev_parse_header(const struct sk_buff *skb,
···
 {
 	const struct net_device *dev = skb->dev;
 
-	if (!dev->hard_header_parse)
+	if (!dev->header_ops->parse)
 		return 0;
-	return dev->hard_header_parse(skb, haddr);
+	return dev->header_ops->parse(skb, haddr);
 }
 
 typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);

include/net/ax25.h

···
 extern int  ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
 
 /* ax25_ip.c */
-extern int  ax25_hard_header(struct sk_buff *, struct net_device *, unsigned short, void *, void *, unsigned int);
+extern int ax25_hard_header(struct sk_buff *, struct net_device *,
+			    unsigned short, const void *,
+			    const void *, unsigned int);
 extern int  ax25_rebuild_header(struct sk_buff *);
+extern const struct header_ops ax25_header_ops;
 
 /* ax25_out.c */
 extern ax25_cb *ax25_send_frame(struct sk_buff *, int, ax25_address *, ax25_address *, ax25_digi *, struct net_device *);

include/net/pkt_sched.h

···
 /* Calculate maximal size of packet seen by hard_start_xmit
    routine of this device.
  */
-static inline unsigned psched_mtu(struct net_device *dev)
+static inline unsigned psched_mtu(const struct net_device *dev)
 {
-	unsigned mtu = dev->mtu;
-	return dev->hard_header ? mtu + dev->hard_header_len : mtu;
+	return dev->mtu + dev->hard_header_len;
 }
 
 #endif

net/802/fc.c

···
 
 static int fc_header(struct sk_buff *skb, struct net_device *dev,
 		     unsigned short type,
-		     void *daddr, void *saddr, unsigned len)
+		     const void *daddr, const void *saddr, unsigned len)
 {
 	struct fch_hdr *fch;
 	int hdr_len;
···
 #endif
 }
 
+static const struct header_ops fc_header_ops = {
+	.create	 = fc_header,
+	.rebuild = fc_rebuild_header,
+};
+
 static void fc_setup(struct net_device *dev)
 {
-	dev->hard_header	= fc_header;
-	dev->rebuild_header	= fc_rebuild_header;
-
+	dev->header_ops		= &fc_header_ops;
 	dev->type		= ARPHRD_IEEE802;
 	dev->hard_header_len	= FC_HLEN;
 	dev->mtu		= 2024;

net/802/fddi.c

···
 
 static int fddi_header(struct sk_buff *skb, struct net_device *dev,
 		       unsigned short type,
-		       void *daddr, void *saddr, unsigned len)
+		       const void *daddr, const void *saddr, unsigned len)
 {
 	int hl = FDDI_K_SNAP_HLEN;
 	struct fddihdr *fddi;
···
 	return(0);
 }
 
+static const struct header_ops fddi_header_ops = {
+	.create		= fddi_header,
+	.rebuild	= fddi_rebuild_header,
+};
+
 static void fddi_setup(struct net_device *dev)
 {
 	dev->change_mtu		= fddi_change_mtu;
-	dev->hard_header	= fddi_header;
-	dev->rebuild_header	= fddi_rebuild_header;
+	dev->header_ops		= &fddi_header_ops;
 
 	dev->type		= ARPHRD_FDDI;
 	dev->hard_header_len	= FDDI_K_SNAP_HLEN+3;	/* Assume 802.2 SNAP hdr len + 3 pad bytes */

net/802/hippi.c

···
  */
 
 static int hippi_header(struct sk_buff *skb, struct net_device *dev,
-			unsigned short type, void *daddr, void *saddr,
-			unsigned len)
+			unsigned short type,
+			const void *daddr, const void *saddr, unsigned len)
 {
 	struct hippi_hdr *hip = (struct hippi_hdr *)skb_push(skb, HIPPI_HLEN);
 	struct hippi_cb *hcb = (struct hippi_cb *) skb->cb;
···
 	return 0;
 }
 
+static const struct header_ops hippi_header_ops = {
+	.create		= hippi_header,
+	.rebuild	= hippi_rebuild_header,
+};
+
+
 static void hippi_setup(struct net_device *dev)
 {
 	dev->set_multicast_list		= NULL;
 	dev->change_mtu			= hippi_change_mtu;
-	dev->hard_header		= hippi_header;
-	dev->rebuild_header 		= hippi_rebuild_header;
+	dev->header_ops			= &hippi_header_ops;
 	dev->set_mac_address 		= hippi_mac_addr;
-	dev->hard_header_parse		= NULL;
-	dev->hard_header_cache		= NULL;
-	dev->header_cache_update	= NULL;
 	dev->neigh_setup 		= hippi_neigh_setup_dev;
 
 	/*

net/802/tr.c

···
 
 static int tr_header(struct sk_buff *skb, struct net_device *dev,
 		     unsigned short type,
-		     void *daddr, void *saddr, unsigned len)
+		     const void *daddr, const void *saddr, unsigned len)
 {
 	struct trh_hdr *trh;
 	int hdr_len;
···
 	if(daddr)
 	{
 		memcpy(trh->daddr,daddr,dev->addr_len);
-		tr_source_route(skb,trh,dev);
+		tr_source_route(skb, trh, dev);
 		return(hdr_len);
 	}
 
···
  *	We try to do source routing...
  */
 
-void tr_source_route(struct sk_buff *skb,struct trh_hdr *trh,struct net_device *dev)
+void tr_source_route(struct sk_buff *skb,struct trh_hdr *trh,
+		     struct net_device *dev)
 {
 	int slack;
 	unsigned int hash;
···
 
 #endif
 
+static const struct header_ops tr_header_ops = {
+	.create = tr_header,
+	.rebuild= tr_rebuild_header,
+};
+
 static void tr_setup(struct net_device *dev)
 {
 	/*
 	 *	Configure and register
 	 */
 
-	dev->hard_header	= tr_header;
-	dev->rebuild_header	= tr_rebuild_header;
+	dev->header_ops	= &tr_header_ops;
 
 	dev->type		= ARPHRD_IEEE802_TR;
 	dev->hard_header_len	= TR_HLEN;

net/8021q/vlan.c

···
  */
 static struct lock_class_key vlan_netdev_xmit_lock_key;
 
+static const struct header_ops vlan_header_ops = {
+	.create	 = vlan_dev_hard_header,
+	.rebuild = vlan_dev_rebuild_header,
+	.parse	 = eth_header_parse,
+};
+
 static int vlan_dev_init(struct net_device *dev)
 {
 	struct net_device *real_dev = VLAN_DEV_INFO(dev)->real_dev;
···
 		memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 
 	if (real_dev->features & NETIF_F_HW_VLAN_TX) {
-		dev->hard_header     = real_dev->hard_header;
+		dev->header_ops      = real_dev->header_ops;
 		dev->hard_header_len = real_dev->hard_header_len;
 		dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
-		dev->rebuild_header  = real_dev->rebuild_header;
 	} else {
-		dev->hard_header     = vlan_dev_hard_header;
+		dev->header_ops      = &vlan_header_ops;
 		dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 		dev->hard_start_xmit = vlan_dev_hard_start_xmit;
-		dev->rebuild_header  = vlan_dev_rebuild_header;
 	}
-	dev->hard_header_parse = real_dev->hard_header_parse;
-	dev->hard_header_cache = NULL;
 
 	lockdep_set_class(&dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
 	return 0;

net/8021q/vlan.h

···
 int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
 		  struct packet_type *ptype, struct net_device *orig_dev);
 int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
-			 unsigned short type, void *daddr, void *saddr,
-			 unsigned len);
+			 unsigned short type, const void *daddr,
+			 const void *saddr, unsigned len);
 int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev);
 int vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb, struct net_device *dev);
 int vlan_dev_change_mtu(struct net_device *dev, int new_mtu);

net/8021q/vlan_dev.c

···
  *  physical devices.
  */
 int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
-			 unsigned short type, void *daddr, void *saddr,
-			 unsigned len)
+			 unsigned short type,
+			 const void *daddr, const void *saddr, unsigned len)
 {
 	struct vlan_hdr *vhdr;
 	unsigned short veth_TCI = 0;

net/appletalk/dev.c

···
 	/* Fill in the fields of the device structure with localtalk-generic values. */
 
 	dev->change_mtu		= ltalk_change_mtu;
-	dev->hard_header	= NULL;
-	dev->rebuild_header 	= NULL;
 	dev->set_mac_address 	= ltalk_mac_addr;
-	dev->hard_header_cache	= NULL;
-	dev->header_cache_update= NULL;
 
 	dev->type		= ARPHRD_LOCALTLK;
 	dev->hard_header_len 	= LTALK_HLEN;

net/ax25/ax25_ip.c

···
 
 #ifdef CONFIG_INET
 
-int ax25_hard_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, void *daddr, void *saddr, unsigned len)
+int ax25_hard_header(struct sk_buff *skb, struct net_device *dev,
+		     unsigned short type, const void *daddr,
+		     const void *saddr, unsigned len)
 {
 	unsigned char *buff;
 
···
 
 #else	/* INET */
 
-int ax25_hard_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, void *daddr, void *saddr, unsigned len)
+int ax25_hard_header(struct sk_buff *skb, struct net_device *dev,
+		     unsigned short type, const void *daddr,
+		     const void *saddr, unsigned len)
 {
 	return -AX25_HEADER_LEN;
 }
···
 
 #endif
 
+const struct header_ops ax25_header_ops = {
+	.create = ax25_hard_header,
+	.rebuild = ax25_rebuild_header,
+};
+
 EXPORT_SYMBOL(ax25_hard_header);
 EXPORT_SYMBOL(ax25_rebuild_header);
+EXPORT_SYMBOL(ax25_header_ops);
+

net/core/dev.c

···
 		request_module("%s", name);
 }
 
-static int default_rebuild_header(struct sk_buff *skb)
-{
-	printk(KERN_DEBUG "%s: default_rebuild_header called -- BUG!\n",
-	       skb->dev ? skb->dev->name : "NULL!!!");
-	kfree_skb(skb);
-	return 1;
-}
-
 /**
  *	dev_open	- prepare an interface for use.
  *	@dev:	device to open
···
 			dev->features &= ~NETIF_F_UFO;
 		}
 	}
-
-	/*
-	 *	nil rebuild_header routine,
-	 *	that should be never called and used as just bug trap.
-	 */
-
-	if (!dev->rebuild_header)
-		dev->rebuild_header = default_rebuild_header;
 
 	ret = netdev_register_kobject(dev);
 	if (ret)

net/core/neighbour.c

···
 static void neigh_update_hhs(struct neighbour *neigh)
 {
 	struct hh_cache *hh;
-	void (*update)(struct hh_cache*, struct net_device*, unsigned char *) =
-		neigh->dev->header_cache_update;
+	void (*update)(struct hh_cache*, const struct net_device*, const unsigned char *)
+		= neigh->dev->header_ops->cache_update;
 
 	if (update) {
 		for (hh = neigh->hh; hh; hh = hh->hh_next) {
···
 		hh->hh_type = protocol;
 		atomic_set(&hh->hh_refcnt, 0);
 		hh->hh_next = NULL;
-		if (dev->hard_header_cache(n, hh)) {
+
+		if (dev->header_ops->cache(n, hh)) {
 			kfree(hh);
 			hh = NULL;
 		} else {
···
 
 	if (dev_hard_header(skb, dev, ntohs(skb->protocol), NULL, NULL,
 			    skb->len) < 0 &&
-	    dev->rebuild_header(skb))
+	    dev->header_ops->rebuild(skb))
 		return 0;
 
 	return dev_queue_xmit(skb);
···
 	if (!neigh_event_send(neigh, skb)) {
 		int err;
 		struct net_device *dev = neigh->dev;
-		if (dev->hard_header_cache && !dst->hh) {
+		if (dev->header_ops->cache && !dst->hh) {
 			write_lock_bh(&neigh->lock);
 			if (!dst->hh)
 				neigh_hh_init(neigh, dst, dst->ops->protocol);

net/ethernet/eth.c

···
  * Set the protocol type. For a packet of type ETH_P_802_3 we put the length
  * in here instead. It is up to the 802.2 layer to carry protocol information.
  */
-int eth_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
-	       void *daddr, void *saddr, unsigned len)
+int eth_header(struct sk_buff *skb, struct net_device *dev,
+	       unsigned short type,
+	       const void *daddr, const void *saddr, unsigned len)
 {
 	struct ethhdr *eth = (struct ethhdr *)skb_push(skb, ETH_HLEN);
 
···
 
 	return -ETH_HLEN;
 }
+EXPORT_SYMBOL(eth_header);
 
 /**
  * eth_rebuild_header- rebuild the Ethernet MAC header.
···
 
 	return 0;
 }
+EXPORT_SYMBOL(eth_rebuild_header);
 
 /**
  * eth_type_trans - determine the packet's protocol ID.
···
  * @skb: packet to extract header from
  * @haddr: destination buffer
  */
-static int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr)
+int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr)
 {
 	const struct ethhdr *eth = eth_hdr(skb);
 	memcpy(haddr, eth->h_source, ETH_ALEN);
 	return ETH_ALEN;
 }
+EXPORT_SYMBOL(eth_header_parse);
 
 /**
  * eth_header_cache - fill cache entry from neighbour
···
  * @hh: destination cache entry
  * Create an Ethernet header template from the neighbour.
  */
-int eth_header_cache(struct neighbour *neigh, struct hh_cache *hh)
+int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh)
 {
 	__be16 type = hh->hh_type;
 	struct ethhdr *eth;
-	struct net_device *dev = neigh->dev;
+	const struct net_device *dev = neigh->dev;
 
 	eth = (struct ethhdr *)
 	    (((u8 *) hh->hh_data) + (HH_DATA_OFF(sizeof(*eth))));
···
 	hh->hh_len = ETH_HLEN;
 	return 0;
 }
+EXPORT_SYMBOL(eth_header_cache);
 
 /**
  * eth_header_cache_update - update cache entry
···
  *
  * Called by Address Resolution module to notify changes in address.
  */
-void eth_header_cache_update(struct hh_cache *hh, struct net_device *dev,
-			     unsigned char *haddr)
+void eth_header_cache_update(struct hh_cache *hh,
+			     const struct net_device *dev,
+			     const unsigned char *haddr)
 {
 	memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)),
 	       haddr, ETH_ALEN);
 }
+EXPORT_SYMBOL(eth_header_cache_update);
 
 /**
  * eth_mac_addr - set new Ethernet hardware address
···
 	return 0;
 }
 
+const struct header_ops eth_header_ops ____cacheline_aligned = {
+	.create		= eth_header,
+	.parse		= eth_header_parse,
+	.rebuild	= eth_rebuild_header,
+	.cache		= eth_header_cache,
+	.cache_update	= eth_header_cache_update,
+};
+
 /**
  * ether_setup - setup Ethernet network device
  * @dev: network device
···
  */
 void ether_setup(struct net_device *dev)
 {
+	dev->header_ops		= &eth_header_ops;
+
 	dev->change_mtu		= eth_change_mtu;
-	dev->hard_header	= eth_header;
-	dev->rebuild_header 	= eth_rebuild_header;
 	dev->set_mac_address 	= eth_mac_addr;
-	dev->hard_header_cache	= eth_header_cache;
-	dev->header_cache_update= eth_header_cache_update;
-	dev->hard_header_parse	= eth_header_parse;
 
 	dev->type		= ARPHRD_ETHER;
 	dev->hard_header_len 	= ETH_HLEN;

net/ipv4/arp.c

···
 	neigh->parms = neigh_parms_clone(parms);
 	rcu_read_unlock();
 
-	if (dev->hard_header == NULL) {
+	if (!dev->header_ops) {
 		neigh->nud_state = NUD_NOARP;
 		neigh->ops = &arp_direct_ops;
 		neigh->output = neigh->ops->queue_xmit;
···
 			neigh->nud_state = NUD_NOARP;
 			memcpy(neigh->ha, dev->broadcast, dev->addr_len);
 		}
-		if (dev->hard_header_cache)
+
+		if (dev->header_ops->cache)
 			neigh->ops = &arp_hh_ops;
 		else
 			neigh->ops = &arp_generic_ops;
+
 		if (neigh->nud_state&NUD_VALID)
 			neigh->output = neigh->ops->connected_output;
 		else

net/ipv4/ip_gre.c

···
 		goto tx_error;
 	}
 
-	if (dev->hard_header) {
+	if (dev->header_ops) {
 		gre_hlen = 0;
 		tiph = (struct iphdr*)skb->data;
 	} else {
···
 
  */
 
-static int ipgre_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
-			void *daddr, void *saddr, unsigned len)
+static int ipgre_header(struct sk_buff *skb, struct net_device *dev,
+			unsigned short type,
+			const void *daddr, const void *saddr, unsigned len)
 {
 	struct ip_tunnel *t = netdev_priv(dev);
 	struct iphdr *iph = (struct iphdr *)skb_push(skb, t->hlen);
···
 
 	return -t->hlen;
 }
+
+static const struct header_ops ipgre_header_ops = {
+	.create	= ipgre_header,
+};
 
 static int ipgre_open(struct net_device *dev)
 {
···
 			if (!iph->saddr)
 				return -EINVAL;
 			dev->flags = IFF_BROADCAST;
-			dev->hard_header = ipgre_header;
+			dev->header_ops = &ipgre_header_ops;
 			dev->open = ipgre_open;
 			dev->stop = ipgre_close;
 		}

net/ipv4/ip_output.c

···
 		IP_INC_STATS(IPSTATS_MIB_OUTBCASTPKTS);
 
 	/* Be paranoid, rather than too clever. */
-	if (unlikely(skb_headroom(skb) < hh_len && dev->hard_header)) {
+	if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
 		struct sk_buff *skb2;
 
 		skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev));

net/ipv6/ndisc.c

···
 	rcu_read_unlock();
 
 	neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST;
-	if (dev->hard_header == NULL) {
+	if (!dev->header_ops) {
 		neigh->nud_state = NUD_NOARP;
 		neigh->ops = &ndisc_direct_ops;
 		neigh->output = neigh->ops->queue_xmit;
···
 			neigh->nud_state = NUD_NOARP;
 			memcpy(neigh->ha, dev->broadcast, dev->addr_len);
 		}
-		if (dev->hard_header_cache)
+		if (dev->header_ops->cache)
 			neigh->ops = &ndisc_hh_ops;
 		else
 			neigh->ops = &ndisc_generic_ops;
···
 		neigh_update(neigh, lladdr, NUD_STALE,
 			     NEIGH_UPDATE_F_WEAK_OVERRIDE|
 			     NEIGH_UPDATE_F_OVERRIDE);
-	if (neigh || !dev->hard_header) {
+	if (neigh || !dev->header_ops) {
 		ndisc_send_na(dev, neigh, saddr, &msg->target,
 			      is_router,
 			      1, (ifp != NULL && inc), inc);

net/mac80211/ieee80211.c

···
 	dev->open = ieee80211_mgmt_open;
 	dev->stop = ieee80211_mgmt_stop;
 	dev->type = ARPHRD_IEEE80211_PRISM;
-	dev->hard_header_parse = header_parse_80211;
 	dev->uninit = ieee80211_if_reinit;
 	dev->destructor = ieee80211_if_free;
 }
···
 	netif_tx_unlock(local->mdev);
 }
 
+static const struct header_ops ieee80211_header_ops = {
+	.create		= eth_header,
+	.parse		= header_parse_80211,
+	.rebuild	= eth_rebuild_header,
+	.cache		= eth_header_cache,
+	.cache_update	= eth_header_cache_update,
+};
+
 /* Must not be called for mdev and apdev */
 void ieee80211_if_setup(struct net_device *dev)
 {
 	ether_setup(dev);
+	dev->header_ops = &ieee80211_header_ops;
 	dev->hard_start_xmit = ieee80211_subif_start_xmit;
 	dev->wireless_handlers = &ieee80211_iw_handler_def;
 	dev->set_multicast_list = ieee80211_set_multicast_list;
···
 	mdev->open = ieee80211_master_open;
 	mdev->stop = ieee80211_master_stop;
 	mdev->type = ARPHRD_IEEE80211;
-	mdev->hard_header_parse = header_parse_80211;
+	mdev->header_ops = &ieee80211_header_ops;
 
 	sdata->type = IEEE80211_IF_TYPE_AP;
 	sdata->dev = mdev;

net/netrom/nr_dev.c

···
 
 #endif
 
-static int nr_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
-	void *daddr, void *saddr, unsigned len)
+static int nr_header(struct sk_buff *skb, struct net_device *dev,
+		     unsigned short type,
+		     const void *daddr, const void *saddr, unsigned len)
 {
 	unsigned char *buff = skb_push(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
 
···
 	return &nr->stats;
 }
 
+static const struct header_ops nr_header_ops = {
+	.create	= nr_header,
+	.rebuild= nr_rebuild_header,
+};
+
+
 void nr_setup(struct net_device *dev)
 {
 	dev->mtu		= NR_MAX_PACKET_SIZE;
···
 	dev->open		= nr_open;
 	dev->stop		= nr_close;
 
-	dev->hard_header	= nr_header;
+	dev->header_ops		= &nr_header_ops;
 	dev->hard_header_len	= NR_NETWORK_LEN + NR_TRANSPORT_LEN;
 	dev->addr_len		= AX25_ADDR_LEN;
 	dev->type		= ARPHRD_NETROM;
-	dev->rebuild_header	= nr_rebuild_header;
 	dev->set_mac_address    = nr_set_mac_address;
 
 	/* New-style flags. */

net/packet/af_packet.c

···
 	skb_reset_network_header(skb);
 
 	/* Try to align data part correctly */
-	if (dev->hard_header) {
+	if (dev->header_ops) {
 		skb->data -= dev->hard_header_len;
 		skb->tail -= dev->hard_header_len;
 		if (len < dev->hard_header_len)
···
 
 	skb->dev = dev;
 
-	if (dev->hard_header) {
+	if (dev->header_ops) {
 		/* The device has an explicit notion of ll header,
 		   exported to higher levels.
 
···
 	sk = pt->af_packet_priv;
 	po = pkt_sk(sk);
 
-	if (dev->hard_header) {
+	if (dev->header_ops) {
 		if (sk->sk_type != SOCK_DGRAM)
 			skb_push(skb, skb->data - skb_mac_header(skb));
 		else if (skb->pkt_type == PACKET_OUTGOING) {

net/rose/rose_dev.c

···
 #include <net/ax25.h>
 #include <net/rose.h>
 
-static int rose_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
-	void *daddr, void *saddr, unsigned len)
+static int rose_header(struct sk_buff *skb, struct net_device *dev,
+		       unsigned short type,
+		       const void *daddr, const void *saddr, unsigned len)
 {
 	unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2);
 
···
 	return netdev_priv(dev);
 }
 
+static const struct header_ops rose_header_ops = {
+	.create	= rose_header,
+	.rebuild= rose_rebuild_header,
+};
+
 void rose_setup(struct net_device *dev)
 {
 	dev->mtu		= ROSE_MAX_PACKET_SIZE - 2;
···
 	dev->open		= rose_open;
 	dev->stop		= rose_close;
 
-	dev->hard_header	= rose_header;
+	dev->header_ops		= &rose_header_ops;
 	dev->hard_header_len	= AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN;
 	dev->addr_len		= ROSE_ADDR_LEN;
 	dev->type		= ARPHRD_ROSE;
-	dev->rebuild_header	= rose_rebuild_header;
 	dev->set_mac_address    = rose_set_mac_address;
 
 	/* New-style flags. */

net/sched/sch_teql.c

···
 	return (skb_res == NULL) ? -EAGAIN : 1;
 }
 
-static __inline__ int
-teql_resolve(struct sk_buff *skb, struct sk_buff *skb_res, struct net_device *dev)
+static inline int teql_resolve(struct sk_buff *skb,
+			       struct sk_buff *skb_res, struct net_device *dev)
 {
-	if (dev->hard_header == NULL ||
+	if (dev->header_ops == NULL ||
 	    skb->dst == NULL ||
 	    skb->dst->neighbour == NULL)
 		return 0;