Merge branch 'neigh_cleanups'

Eric W. Biederman says:

====================
Neighbour table and ax25 cleanups

While looking at the neighbour table to what it would take to allow
using next hops in a different address family than the current packets
I found a partial resolution for my issues and I stumbled upon some
work that makes the neighbour table code easier to understand and
maintain.

Long ago in a much younger kernel ax25 found a hack to use
dev_rebuild_header to transmit it's packets instead of going through
what today is ndo_start_xmit.

When the neighbour table was rewritten into it's current form the ax25
code was such a challenge that arp_broken_ops appeard in arp.c and
neigh_compat_output appeared in neighbour.c to keep the ax25 hack alive.

With a little bit of work I was able to remove some of the hack that
is the ax25 transmit path for ip packets and to isolate what remains
into a slightly more readable piece of code in ax25_ip.c.  Removing the
need for the generic code to worry about ax25 special cases.

After cleaning up the old ax25 hacks I also performed a little bit of
work on neigh_resolve_output to remove the need for a dst entry and to
ensure cached headers get a deterministic protocol value in their cached
header.   This guarantees that a cached header will not be different
depending on which protocol of packet is transmitted, and it allows
packets to be transmitted that don't have a dst entry.  There remains
a small amount of code that takes advantage of when packets have a dst
entry but that is something different.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

12 files changed, 18 insertions, 117 deletions

diff --git a/drivers/net/arcnet/arcnet.c b/drivers/net/arcnet/arcnet.c
index 09de683c167e..10f71c732b59 100644
--- a/drivers/net/arcnet/arcnet.c
+++ b/drivers/net/arcnet/arcnet.c
@@ -104,7 +104,6 @@ EXPORT_SYMBOL(arcnet_timeout);
 static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
 			 unsigned short type, const void *daddr,
 			 const void *saddr, unsigned len);
-static int arcnet_rebuild_header(struct sk_buff *skb);
 static int go_tx(struct net_device *dev);
 
 static int debug = ARCNET_DEBUG;
@@ -312,7 +311,6 @@ static int choose_mtu(void)
 
 static const struct header_ops arcnet_header_ops = {
 	.create = arcnet_header,
-	.rebuild = arcnet_rebuild_header,
 };
 
 static const struct net_device_ops arcnet_netdev_ops = {
@@ -538,59 +536,6 @@ static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
 	return proto->build_header(skb, dev, type, _daddr);
 }
 
-
-/* 
- * Rebuild the ARCnet hard header. This is called after an ARP (or in the
- * future other address resolution) has completed on this sk_buff. We now
- * let ARP fill in the destination field.
- */
-static int arcnet_rebuild_header(struct sk_buff *skb)
-{
-	struct net_device *dev = skb->dev;
-	struct arcnet_local *lp = netdev_priv(dev);
-	int status = 0;		/* default is failure */
-	unsigned short type;
-	uint8_t daddr=0;
-	struct ArcProto *proto;
-	/*
-	 * XXX: Why not use skb->mac_len?
-	 */
-	if (skb->network_header - skb->mac_header != 2) {
-		BUGMSG(D_NORMAL,
-		       "rebuild_header: shouldn't be here! (hdrsize=%d)\n",
-		       (int)(skb->network_header - skb->mac_header));
-		return 0;
-	}
-	type = *(uint16_t *) skb_pull(skb, 2);
-	BUGMSG(D_DURING, "rebuild header for protocol %Xh\n", type);
-
-	if (type == ETH_P_IP) {
-#ifdef CONFIG_INET
-		BUGMSG(D_DURING, "rebuild header for ethernet protocol %Xh\n", type);
-		status = arp_find(&daddr, skb) ? 1 : 0;
-		BUGMSG(D_DURING, " rebuilt: dest is %d; protocol %Xh\n",
-		       daddr, type);
-#endif
-	} else {
-		BUGMSG(D_NORMAL,
-		       "I don't understand ethernet protocol %Xh addresses!\n", type);
-		dev->stats.tx_errors++;
-		dev->stats.tx_aborted_errors++;
-	}
-
-	/* if we couldn't resolve the address... give up. */
-	if (!status)
-		return 0;
-
-	/* add the _real_ header this time! */
-	proto = arc_proto_map[lp->default_proto[daddr]];
-	proto->build_header(skb, dev, type, daddr);
-
-	return 1;		/* success */
-}
-
-
-
 /* Called by the kernel in order to transmit a packet. */
 netdev_tx_t arcnet_send_packet(struct sk_buff *skb,
 				     struct net_device *dev)
diff --git a/drivers/net/hamradio/6pack.c b/drivers/net/hamradio/6pack.c
index daca0dee88f3..0b8393ca8c80 100644
--- a/drivers/net/hamradio/6pack.c
+++ b/drivers/net/hamradio/6pack.c
@@ -284,18 +284,6 @@ static int sp_close(struct net_device *dev)
 	return 0;
 }
 
-/* Return the frame type ID */
-static int sp_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 != ETH_P_AX25)
-		return ax25_hard_header(skb, dev, type, daddr, saddr, len);
-#endif
-	return 0;
-}
-
 static int sp_set_mac_address(struct net_device *dev, void *addr)
 {
 	struct sockaddr_ax25 *sa = addr;
@@ -309,25 +297,12 @@ static int sp_set_mac_address(struct net_device *dev, void *addr)
 	return 0;
 }
 
-static int sp_rebuild_header(struct sk_buff *skb)
-{
-#ifdef CONFIG_INET
-	return ax25_rebuild_header(skb);
-#else
-	return 0;
-#endif
-}
-
-static const struct header_ops sp_header_ops = {
-	.create		= sp_header,
-	.rebuild	= sp_rebuild_header,
-};
-
 static const struct net_device_ops sp_netdev_ops = {
 	.ndo_open		= sp_open_dev,
 	.ndo_stop		= sp_close,
 	.ndo_start_xmit		= sp_xmit,
 	.ndo_set_mac_address    = sp_set_mac_address,
+	.ndo_neigh_construct	= ax25_neigh_construct,
 };
 
 static void sp_setup(struct net_device *dev)
@@ -337,10 +312,11 @@ static void sp_setup(struct net_device *dev)
 	dev->destructor		= free_netdev;
 	dev->mtu		= SIXP_MTU;
 	dev->hard_header_len	= AX25_MAX_HEADER_LEN;
-	dev->header_ops 	= &sp_header_ops;
+	dev->header_ops 	= &ax25_header_ops;
 
 	dev->addr_len		= AX25_ADDR_LEN;
 	dev->type		= ARPHRD_AX25;
+	dev->neigh_priv_len	= sizeof(struct ax25_neigh_priv);
 	dev->tx_queue_len	= 10;
 
 	/* Only activated in AX.25 mode */
diff --git a/drivers/net/hamradio/baycom_epp.c b/drivers/net/hamradio/baycom_epp.c
index a98c153f371e..3539ab392f7d 100644
--- a/drivers/net/hamradio/baycom_epp.c
+++ b/drivers/net/hamradio/baycom_epp.c
@@ -1109,6 +1109,7 @@ static const struct net_device_ops baycom_netdev_ops = {
 	.ndo_do_ioctl	     = baycom_ioctl,
 	.ndo_start_xmit      = baycom_send_packet,
 	.ndo_set_mac_address = baycom_set_mac_address,
+	.ndo_neigh_construct = ax25_neigh_construct,
 };
 
 /*
@@ -1146,6 +1147,7 @@ static void baycom_probe(struct net_device *dev)
 	dev->header_ops = &ax25_header_ops;
 	
 	dev->type = ARPHRD_AX25;           /* AF_AX25 device */
+	dev->neigh_priv_len = sizeof(struct ax25_neigh_priv);
 	dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
 	dev->mtu = AX25_DEF_PACLEN;        /* eth_mtu is the default */
 	dev->addr_len = AX25_ADDR_LEN;     /* sizeof an ax.25 address */
diff --git a/drivers/net/hamradio/bpqether.c b/drivers/net/hamradio/bpqether.c
index c2894e43840e..bce105b16ed0 100644
--- a/drivers/net/hamradio/bpqether.c
+++ b/drivers/net/hamradio/bpqether.c
@@ -469,6 +469,7 @@ static const struct net_device_ops bpq_netdev_ops = {
 	.ndo_start_xmit	     = bpq_xmit,
 	.ndo_set_mac_address = bpq_set_mac_address,
 	.ndo_do_ioctl	     = bpq_ioctl,
+	.ndo_neigh_construct = ax25_neigh_construct,
 };
 
 static void bpq_setup(struct net_device *dev)
@@ -486,6 +487,7 @@ static void bpq_setup(struct net_device *dev)
 #endif
 
 	dev->type            = ARPHRD_AX25;
+	dev->neigh_priv_len  = sizeof(struct ax25_neigh_priv);
 	dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
 	dev->mtu             = AX25_DEF_PACLEN;
 	dev->addr_len        = AX25_ADDR_LEN;
diff --git a/drivers/net/hamradio/dmascc.c b/drivers/net/hamradio/dmascc.c
index 0fad408f24aa..abab7be77406 100644
--- a/drivers/net/hamradio/dmascc.c
+++ b/drivers/net/hamradio/dmascc.c
@@ -433,6 +433,7 @@ module_exit(dmascc_exit);
 static void __init dev_setup(struct net_device *dev)
 {
 	dev->type = ARPHRD_AX25;
+	dev->neigh_priv_len = sizeof(struct ax25_neigh_priv);
 	dev->hard_header_len = AX25_MAX_HEADER_LEN;
 	dev->mtu = 1500;
 	dev->addr_len = AX25_ADDR_LEN;
@@ -447,6 +448,7 @@ static const struct net_device_ops scc_netdev_ops = {
 	.ndo_start_xmit = scc_send_packet,
 	.ndo_do_ioctl = scc_ioctl,
 	.ndo_set_mac_address = scc_set_mac_address,
+	.ndo_neigh_construct = ax25_neigh_construct,
 };
 
 static int __init setup_adapter(int card_base, int type, int n)
diff --git a/drivers/net/hamradio/hdlcdrv.c b/drivers/net/hamradio/hdlcdrv.c
index c67a27245072..435868a7b69c 100644
--- a/drivers/net/hamradio/hdlcdrv.c
+++ b/drivers/net/hamradio/hdlcdrv.c
@@ -626,6 +626,7 @@ static const struct net_device_ops hdlcdrv_netdev = {
 	.ndo_start_xmit = hdlcdrv_send_packet,
 	.ndo_do_ioctl	= hdlcdrv_ioctl,
 	.ndo_set_mac_address = hdlcdrv_set_mac_address,
+	.ndo_neigh_construct = ax25_neigh_construct,
 };
 
 /*
@@ -676,6 +677,7 @@ static void hdlcdrv_setup(struct net_device *dev)
 	dev->header_ops = &ax25_header_ops;
 	
 	dev->type = ARPHRD_AX25;           /* AF_AX25 device */
+	dev->neigh_priv_len = sizeof(struct ax25_neigh_priv);
 	dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
 	dev->mtu = AX25_DEF_PACLEN;        /* eth_mtu is the default */
 	dev->addr_len = AX25_ADDR_LEN;     /* sizeof an ax.25 address */
diff --git a/drivers/net/hamradio/mkiss.c b/drivers/net/hamradio/mkiss.c
index f990bb1c3e02..c12ec2c2b594 100644
--- a/drivers/net/hamradio/mkiss.c
+++ b/drivers/net/hamradio/mkiss.c
@@ -573,32 +573,6 @@ static int ax_open_dev(struct net_device *dev)
 	return 0;
 }
 
-#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, const void *daddr,
-		     const void *saddr, unsigned len)
-{
-#ifdef CONFIG_INET
-	if (type != ETH_P_AX25)
-		return ax25_hard_header(skb, dev, type, daddr, saddr, len);
-#endif
-	return 0;
-}
-
-
-static int ax_rebuild_header(struct sk_buff *skb)
-{
-#ifdef CONFIG_INET
-	return ax25_rebuild_header(skb);
-#else
-	return 0;
-#endif
-}
-
-#endif	/* CONFIG_{AX25,AX25_MODULE} */
-
 /* Open the low-level part of the AX25 channel. Easy! */
 static int ax_open(struct net_device *dev)
 {
@@ -662,16 +636,12 @@ static int ax_close(struct net_device *dev)
 	return 0;
 }
 
-static const struct header_ops ax_header_ops = {
-	.create    = ax_header,
-	.rebuild   = ax_rebuild_header,
-};
-
 static const struct net_device_ops ax_netdev_ops = {
 	.ndo_open            = ax_open_dev,
 	.ndo_stop            = ax_close,
 	.ndo_start_xmit	     = ax_xmit,
 	.ndo_set_mac_address = ax_set_mac_address,
+	.ndo_neigh_construct = ax25_neigh_construct,
 };
 
 static void ax_setup(struct net_device *dev)
@@ -681,8 +651,9 @@ static void ax_setup(struct net_device *dev)
 	dev->hard_header_len = 0;
 	dev->addr_len        = 0;
 	dev->type            = ARPHRD_AX25;
+	dev->neigh_priv_len  = sizeof(struct ax25_neigh_priv);
 	dev->tx_queue_len    = 10;
-	dev->header_ops      = &ax_header_ops;
+	dev->header_ops      = &ax25_header_ops;
 	dev->netdev_ops	     = &ax_netdev_ops;
 
 
diff --git a/drivers/net/hamradio/scc.c b/drivers/net/hamradio/scc.c
index 57be9e0e98a6..b305f51eb420 100644
--- a/drivers/net/hamradio/scc.c
+++ b/drivers/net/hamradio/scc.c
@@ -1550,6 +1550,7 @@ static const struct net_device_ops scc_netdev_ops = {
 	.ndo_set_mac_address = scc_net_set_mac_address,
 	.ndo_get_stats       = scc_net_get_stats,
 	.ndo_do_ioctl        = scc_net_ioctl,
+	.ndo_neigh_construct = ax25_neigh_construct,
 };
 
 /* ----> Initialize device <----- */
@@ -1567,6 +1568,7 @@ static void scc_net_setup(struct net_device *dev)
 	dev->flags      = 0;
 
 	dev->type = ARPHRD_AX25;
+	dev->neigh_priv_len = sizeof(struct ax25_neigh_priv);
 	dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
 	dev->mtu = AX25_DEF_PACLEN;
 	dev->addr_len = AX25_ADDR_LEN;
diff --git a/drivers/net/hamradio/yam.c b/drivers/net/hamradio/yam.c
index 717433cfb81d..89d9da7a0c51 100644
--- a/drivers/net/hamradio/yam.c
+++ b/drivers/net/hamradio/yam.c
@@ -1100,6 +1100,7 @@ static const struct net_device_ops yam_netdev_ops = {
 	.ndo_start_xmit      = yam_send_packet,
 	.ndo_do_ioctl 	     = yam_ioctl,
 	.ndo_set_mac_address = yam_set_mac_address,
+	.ndo_neigh_construct = ax25_neigh_construct,
 };
 
 static void yam_setup(struct net_device *dev)
@@ -1128,6 +1129,7 @@ static void yam_setup(struct net_device *dev)
 	dev->header_ops = &ax25_header_ops;
 
 	dev->type = ARPHRD_AX25;
+	dev->neigh_priv_len = sizeof(struct ax25_neigh_priv);
 	dev->hard_header_len = AX25_MAX_HEADER_LEN;
 	dev->mtu = AX25_MTU;
 	dev->addr_len = AX25_ADDR_LEN;
diff --git a/drivers/net/ipvlan/ipvlan_main.c b/drivers/net/ipvlan/ipvlan_main.c
index 4f4099d5603d..2950c3780230 100644
--- a/drivers/net/ipvlan/ipvlan_main.c
+++ b/drivers/net/ipvlan/ipvlan_main.c
@@ -336,7 +336,6 @@ static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 
 static const struct header_ops ipvlan_header_ops = {
 	.create  	= ipvlan_hard_header,
-	.rebuild	= eth_rebuild_header,
 	.parse		= eth_header_parse,
 	.cache		= eth_header_cache,
 	.cache_update	= eth_header_cache_update,
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 1df38bdae2ee..b5e3320ca506 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -550,7 +550,6 @@ static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
 
 static const struct header_ops macvlan_hard_header_ops = {
 	.create  	= macvlan_hard_header,
-	.rebuild	= eth_rebuild_header,
 	.parse		= eth_header_parse,
 	.cache		= eth_header_cache,
 	.cache_update	= eth_header_cache_update,
diff --git a/drivers/net/wireless/hostap/hostap_main.c b/drivers/net/wireless/hostap/hostap_main.c
index 52919ad42726..8f9f3e9fbfce 100644
--- a/drivers/net/wireless/hostap/hostap_main.c
+++ b/drivers/net/wireless/hostap/hostap_main.c
@@ -798,7 +798,6 @@ static void prism2_tx_timeout(struct net_device *dev)
 
 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,