/* * Copyright (c) 2007-2012 Nicira, Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/if_arp.h>#include <linux/if_bridge.h>#include <linux/if_vlan.h>#include <linux/kernel.h>#include <linux/llc.h>#include <linux/rtnetlink.h>#include <linux/skbuff.h>#include <linux/openvswitch.h> #include <net/llc.h> #include "datapath.h"#include "vport-internal_dev.h"#include "vport-netdev.h" /* Must be called with rcu_read_lock. */static void netdev_port_receive(struct vport *vport, struct sk_buff *skb){	if (unlikely(!vport))		goto error; 	if (unlikely(skb_warn_if_lro(skb)))		goto error; 	/* Make our own copy of the packet.  Otherwise we will mangle the	 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).	 */	skb = skb_share_check(skb, GFP_ATOMIC);	if (unlikely(!skb))		return; 	skb_push(skb, ETH_HLEN);	ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN); 	ovs_vport_receive(vport, skb, NULL);	return; error:	kfree_skb(skb);} /* Called with rcu_read_lock and bottom-halves disabled. */static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb){	struct sk_buff *skb = *pskb;	struct vport *vport; 	if (unlikely(skb->pkt_type == PACKET_LOOPBACK))		return RX_HANDLER_PASS; 	vport = ovs_netdev_get_vport(skb->dev); 	netdev_port_receive(vport, skb); 	return RX_HANDLER_CONSUMED;} static struct net_device *get_dpdev(struct datapath *dp){	struct vport *local; 	local = ovs_vport_ovsl(dp, OVSP_LOCAL);	BUG_ON(!local);	return netdev_vport_priv(local)->dev;} static struct vport *netdev_create(const struct vport_parms *parms){	struct vport *vport;	struct netdev_vport *netdev_vport;	int err; 	vport = ovs_vport_alloc(sizeof(struct netdev_vport),				&ovs_netdev_vport_ops, parms);	if (IS_ERR(vport)) {		err = PTR_ERR(vport);		goto error;	} 	netdev_vport = netdev_vport_priv(vport); 	netdev_vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), parms->name);	if (!netdev_vport->dev) {		err = -ENODEV;		goto error_free_vport;	} 	if (netdev_vport->dev->flags & IFF_LOOPBACK ||	    netdev_vport->dev->type != ARPHRD_ETHER ||	    ovs_is_internal_dev(netdev_vport->dev)) {		err = -EINVAL;		goto error_put;	} 	rtnl_lock();	err = netdev_master_upper_dev_link(netdev_vport->dev,					   get_dpdev(vport->dp));	if (err)		goto error_unlock; 	err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook,					 vport);	if (err)		goto error_master_upper_dev_unlink; 	dev_set_promiscuity(netdev_vport->dev, 1);	netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH;	rtnl_unlock(); 	return vport; error_master_upper_dev_unlink:	netdev_upper_dev_unlink(netdev_vport->dev, get_dpdev(vport->dp));error_unlock:	rtnl_unlock();error_put:	dev_put(netdev_vport->dev);error_free_vport:	ovs_vport_free(vport);error:	return ERR_PTR(err);} static void free_port_rcu(struct rcu_head *rcu){	struct netdev_vport *netdev_vport = container_of(rcu,					struct netdev_vport, rcu); 	dev_put(netdev_vport->dev);	ovs_vport_free(vport_from_priv(netdev_vport));} void ovs_netdev_detach_dev(struct vport *vport){	struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 	ASSERT_RTNL();	netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;	netdev_rx_handler_unregister(netdev_vport->dev);	netdev_upper_dev_unlink(netdev_vport->dev,				netdev_master_upper_dev_get(netdev_vport->dev));	dev_set_promiscuity(netdev_vport->dev, -1);} static void netdev_destroy(struct vport *vport){	struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 	rtnl_lock();	if (netdev_vport->dev->priv_flags & IFF_OVS_DATAPATH)		ovs_netdev_detach_dev(vport);	rtnl_unlock(); 	call_rcu(&netdev_vport->rcu, free_port_rcu);} const char *ovs_netdev_get_name(const struct vport *vport){	const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);	return netdev_vport->dev->name;} static unsigned int packet_length(const struct sk_buff *skb){	unsigned int length = skb->len - ETH_HLEN; 	if (skb->protocol == htons(ETH_P_8021Q))		length -= VLAN_HLEN; 	return length;} static int netdev_send(struct vport *vport, struct sk_buff *skb){	struct netdev_vport *netdev_vport = netdev_vport_priv(vport);	int mtu = netdev_vport->dev->mtu;	int len; 	if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) {		net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",				     netdev_vport->dev->name,				     packet_length(skb), mtu);		goto drop;	} 	skb->dev = netdev_vport->dev;	len = skb->len;	dev_queue_xmit(skb); 	return len; drop:	kfree_skb(skb);	return 0;} /* Returns null if this device is not attached to a datapath. */struct vport *ovs_netdev_get_vport(struct net_device *dev){	if (likely(dev->priv_flags & IFF_OVS_DATAPATH))		return (struct vport *)			rcu_dereference_rtnl(dev->rx_handler_data);	else		return NULL;} const struct vport_ops ovs_netdev_vport_ops = {	.type		= OVS_VPORT_TYPE_NETDEV,	.create		= netdev_create,	.destroy	= netdev_destroy,	.get_name	= ovs_netdev_get_name,	.send		= netdev_send,};