net: Audit drivers to identify those needing IFF_TX_SKB_SHARING cleared

After the last patch, We are left in a state in which only drivers calling
ether_setup have IFF_TX_SKB_SHARING set (we assume that drivers touching real
hardware call ether_setup for their net_devices and don't hold any state in
their skbs.  There are a handful of drivers that violate this assumption of
course, and need to be fixed up.  This patch identifies those drivers, and marks
them as not being able to support the safe transmission of skbs by clearning the
IFF_TX_SKB_SHARING flag in priv_flags

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
CC: Karsten Keil <isdn@linux-pingi.de>
CC: "David S. Miller" <davem@davemloft.net>
CC: Jay Vosburgh <fubar@us.ibm.com>
CC: Andy Gospodarek <andy@greyhouse.net>
CC: Patrick McHardy <kaber@trash.net>
CC: Krzysztof Halasa <khc@pm.waw.pl>
CC: "John W. Linville" <linville@tuxdriver.com>
CC: Greg Kroah-Hartman <gregkh@suse.de>
CC: Marcel Holtmann <marcel@holtmann.org>
CC: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
{
	struct macvlan_port *port;
	struct sk_buff *skb = *pskb;
	const struct ethhdr *eth = eth_hdr(skb);
	const struct macvlan_dev *vlan;
	const struct macvlan_dev *src;
	struct net_device *dev;
	unsigned int len = 0;
	int ret = NET_RX_DROP;

	port = macvlan_port_get_rcu(skb->dev);
	if (is_multicast_ether_addr(eth->h_dest)) {
		src = macvlan_hash_lookup(port, eth->h_source);
		if (!src)
			/* frame comes from an external address */
			macvlan_broadcast(skb, port, NULL,
					  MACVLAN_MODE_PRIVATE |
					  MACVLAN_MODE_VEPA    |
					  MACVLAN_MODE_PASSTHRU|
					  MACVLAN_MODE_BRIDGE);
		else if (src->mode == MACVLAN_MODE_VEPA)
			/* flood to everyone except source */
			macvlan_broadcast(skb, port, src->dev,
					  MACVLAN_MODE_VEPA |
					  MACVLAN_MODE_BRIDGE);
		else if (src->mode == MACVLAN_MODE_BRIDGE)
			/*
			 * flood only to VEPA ports, bridge ports
			 * already saw the frame on the way out.
			 */
			macvlan_broadcast(skb, port, src->dev,
					  MACVLAN_MODE_VEPA);
		return RX_HANDLER_PASS;
	}

	if (port->passthru)
		vlan = list_first_entry(&port->vlans, struct macvlan_dev, list);
	else
		vlan = macvlan_hash_lookup(port, eth->h_dest);
	if (vlan == NULL)
		return RX_HANDLER_PASS;

	dev = vlan->dev;
	if (unlikely(!(dev->flags & IFF_UP))) {
		kfree_skb(skb);
		return RX_HANDLER_CONSUMED;
	}
	len = skb->len + ETH_HLEN;
	skb = skb_share_check(skb, GFP_ATOMIC);
	if (!skb)
		goto out;

	skb->dev = dev;
	skb->pkt_type = PACKET_HOST;

	ret = vlan->receive(skb);

out:
	macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
	return RX_HANDLER_CONSUMED;
}

static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
{
	struct macvlan_port *port;
	struct sk_buff *skb = *pskb;
	const struct ethhdr *eth = eth_hdr(skb);
	const struct macvlan_dev *vlan;
	const struct macvlan_dev *src;
	struct net_device *dev;
	unsigned int len = 0;
	int ret = NET_RX_DROP;

	port = macvlan_port_get_rcu(skb->dev);
	if (is_multicast_ether_addr(eth->h_dest)) {
		src = macvlan_hash_lookup(port, eth->h_source);
		if (!src)
			/* frame comes from an external address */
			macvlan_broadcast(skb, port, NULL,
					  MACVLAN_MODE_PRIVATE |
					  MACVLAN_MODE_VEPA    |
					  MACVLAN_MODE_PASSTHRU|
					  MACVLAN_MODE_BRIDGE);
		else if (src->mode == MACVLAN_MODE_VEPA)
			/* flood to everyone except source */
			macvlan_broadcast(skb, port, src->dev,
					  MACVLAN_MODE_VEPA |
					  MACVLAN_MODE_BRIDGE);
		else if (src->mode == MACVLAN_MODE_BRIDGE)
			/*
			 * flood only to VEPA ports, bridge ports
			 * already saw the frame on the way out.
			 */
			macvlan_broadcast(skb, port, src->dev,
					  MACVLAN_MODE_VEPA);
		return RX_HANDLER_PASS;
	}

	if (port->passthru)
		vlan = list_first_entry(&port->vlans, struct macvlan_dev, list);
	else
		vlan = macvlan_hash_lookup(port, eth->h_dest);
	if (vlan == NULL)
		return RX_HANDLER_PASS;

	dev = vlan->dev;
	if (unlikely(!(dev->flags & IFF_UP))) {
		kfree_skb(skb);
		return RX_HANDLER_CONSUMED;
	}
	len = skb->len + ETH_HLEN;
	skb = skb_share_check(skb, GFP_ATOMIC);
	if (!skb)
		goto out;

	skb->dev = dev;
	skb->pkt_type = PACKET_HOST;

	ret = vlan->receive(skb);

out:
	macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
	return RX_HANDLER_CONSUMED;
}
