// SPDX-License-Identifier: GPL-2.0-only/* * Copyright (c) 2007-2012 Nicira, Inc. */ #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 <linux/export.h> #include <net/ip_tunnels.h>#include <net/rtnetlink.h> #include "datapath.h"#include "vport.h"#include "vport-internal_dev.h"#include "vport-netdev.h" static struct vport_ops ovs_netdev_vport_ops; /* Must be called with rcu_read_lock. */static void netdev_port_receive(struct sk_buff *skb){	struct vport *vport; 	vport = ovs_netdev_get_vport(skb->dev);	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; 	if (skb->dev->type == ARPHRD_ETHER)		skb_push_rcsum(skb, ETH_HLEN); 	ovs_vport_receive(vport, skb, skb_tunnel_info(skb));	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; 	if (unlikely(skb->pkt_type == PACKET_LOOPBACK))		return RX_HANDLER_PASS; 	netdev_port_receive(skb);	return RX_HANDLER_CONSUMED;} static struct net_device *get_dpdev(const struct datapath *dp){	struct vport *local; 	local = ovs_vport_ovsl(dp, OVSP_LOCAL);	return local->dev;} static struct vport *ovs_netdev_link(struct vport *vport){	int err; 	if (WARN_ON_ONCE(!vport->dev)) {		err = -ENODEV;		goto error_free_vport;	} 	rtnl_lock();	/* Do not link devices that are not registered to avoid a potential	 * race with the NETDEV_UNREGISTER notification in dp_device_event().	 */	if (vport->dev->reg_state != NETREG_REGISTERED) {		err = -ENODEV;		goto error_put_unlock;	} 	err = netdev_master_upper_dev_link(vport->dev,					   get_dpdev(vport->dp),					   NULL, NULL, NULL);	if (err)		goto error_put_unlock; 	err = netdev_rx_handler_register(vport->dev, netdev_frame_hook,					 vport);	if (err)		goto error_master_upper_dev_unlink; 	dev_disable_lro(vport->dev);	dev_set_promiscuity(vport->dev, 1);	vport->dev->priv_flags |= IFF_OVS_DATAPATH;	rtnl_unlock(); 	return vport; error_master_upper_dev_unlink:	netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp));error_put_unlock:	netdev_put(vport->dev, &vport->dev_tracker);	rtnl_unlock();error_free_vport:	ovs_vport_free(vport);	return ERR_PTR(err);} static struct vport *netdev_create(const struct vport_parms *parms){	struct vport *vport;	int err; 	vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms);	if (IS_ERR(vport))		return vport; 	vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), parms->name);	if (!vport->dev) {		err = -ENODEV;		goto error_free_vport;	}	netdev_tracker_alloc(vport->dev, &vport->dev_tracker, GFP_KERNEL); 	/* Ensure that the provided name is not an alias. */	if (strcmp(parms->name, ovs_vport_name(vport))) {		err = -ENODEV;		goto error_put;	} 	if (vport->dev->flags & IFF_LOOPBACK ||	    (vport->dev->type != ARPHRD_ETHER &&	     vport->dev->type != ARPHRD_NONE) ||	    ovs_is_internal_dev(vport->dev)) {		err = -EINVAL;		goto error_put;	} 	return ovs_netdev_link(vport);error_put:	netdev_put(vport->dev, &vport->dev_tracker);error_free_vport:	ovs_vport_free(vport);	return ERR_PTR(err);} static void vport_netdev_free(struct rcu_head *rcu){	struct vport *vport = container_of(rcu, struct vport, rcu); 	netdev_put(vport->dev, &vport->dev_tracker);	ovs_vport_free(vport);} void ovs_netdev_detach_dev(struct vport *vport){	ASSERT_RTNL();	netdev_rx_handler_unregister(vport->dev);	netdev_upper_dev_unlink(vport->dev,				netdev_master_upper_dev_get(vport->dev));	dev_set_promiscuity(vport->dev, -1); 	/* paired with smp_mb() in netdev_destroy() */	smp_wmb(); 	vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;} static void netdev_destroy(struct vport *vport){	/* When called from ovs_db_notify_wq() after a dp_device_event(), the	 * port has already been detached, so we can avoid taking the RTNL by	 * checking this first.	 */	if (netif_is_ovs_port(vport->dev)) {		rtnl_lock();		/* Check again while holding the lock to ensure we don't race		 * with the netdev notifier and detach twice.		 */		if (netif_is_ovs_port(vport->dev))			ovs_netdev_detach_dev(vport);		rtnl_unlock();	} 	/* paired with smp_wmb() in ovs_netdev_detach_dev() */	smp_mb(); 	call_rcu(&vport->rcu, vport_netdev_free);} /* Returns null if this device is not attached to a datapath. */struct vport *ovs_netdev_get_vport(struct net_device *dev){	if (likely(netif_is_ovs_port(dev)))		return (struct vport *)			rcu_dereference_rtnl(dev->rx_handler_data);	else		return NULL;} static struct vport_ops ovs_netdev_vport_ops = {	.type		= OVS_VPORT_TYPE_NETDEV,	.create		= netdev_create,	.destroy	= netdev_destroy,	.send		= dev_queue_xmit,}; int __init ovs_netdev_init(void){	return ovs_vport_ops_register(&ovs_netdev_vport_ops);} void ovs_netdev_exit(void){	ovs_vport_ops_unregister(&ovs_netdev_vport_ops);}