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v5.14.15
  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (c) 2007-2012 Nicira, Inc.
  4 */
  5
  6#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  7
  8#include <linux/if_arp.h>
  9#include <linux/if_bridge.h>
 10#include <linux/if_vlan.h>
 11#include <linux/kernel.h>
 12#include <linux/llc.h>
 13#include <linux/rtnetlink.h>
 14#include <linux/skbuff.h>
 15#include <linux/openvswitch.h>
 16#include <linux/export.h>
 17
 18#include <net/ip_tunnels.h>
 19#include <net/rtnetlink.h>
 20
 21#include "datapath.h"
 22#include "vport.h"
 23#include "vport-internal_dev.h"
 24#include "vport-netdev.h"
 25
 26static struct vport_ops ovs_netdev_vport_ops;
 27
 28/* Must be called with rcu_read_lock. */
 29static void netdev_port_receive(struct sk_buff *skb)
 30{
 31	struct vport *vport;
 32
 33	vport = ovs_netdev_get_vport(skb->dev);
 34	if (unlikely(!vport))
 35		goto error;
 36
 37	if (unlikely(skb_warn_if_lro(skb)))
 38		goto error;
 39
 40	/* Make our own copy of the packet.  Otherwise we will mangle the
 41	 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
 42	 */
 43	skb = skb_share_check(skb, GFP_ATOMIC);
 44	if (unlikely(!skb))
 45		return;
 46
 47	if (skb->dev->type == ARPHRD_ETHER)
 48		skb_push_rcsum(skb, ETH_HLEN);
 49
 50	ovs_vport_receive(vport, skb, skb_tunnel_info(skb));
 51	return;
 52error:
 53	kfree_skb(skb);
 54}
 55
 56/* Called with rcu_read_lock and bottom-halves disabled. */
 57static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
 58{
 59	struct sk_buff *skb = *pskb;
 60
 61	if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
 62		return RX_HANDLER_PASS;
 63
 64	netdev_port_receive(skb);
 65	return RX_HANDLER_CONSUMED;
 66}
 67
 68static struct net_device *get_dpdev(const struct datapath *dp)
 69{
 70	struct vport *local;
 71
 72	local = ovs_vport_ovsl(dp, OVSP_LOCAL);
 73	return local->dev;
 74}
 75
 76struct vport *ovs_netdev_link(struct vport *vport, const char *name)
 77{
 78	int err;
 79
 80	vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name);
 81	if (!vport->dev) {
 82		err = -ENODEV;
 83		goto error_free_vport;
 84	}
 85
 
 
 
 
 
 
 
 86	if (vport->dev->flags & IFF_LOOPBACK ||
 87	    (vport->dev->type != ARPHRD_ETHER &&
 88	     vport->dev->type != ARPHRD_NONE) ||
 89	    ovs_is_internal_dev(vport->dev)) {
 90		err = -EINVAL;
 91		goto error_put;
 92	}
 93
 94	rtnl_lock();
 95	err = netdev_master_upper_dev_link(vport->dev,
 96					   get_dpdev(vport->dp),
 97					   NULL, NULL, NULL);
 98	if (err)
 99		goto error_unlock;
100
101	err = netdev_rx_handler_register(vport->dev, netdev_frame_hook,
102					 vport);
103	if (err)
104		goto error_master_upper_dev_unlink;
105
106	dev_disable_lro(vport->dev);
107	dev_set_promiscuity(vport->dev, 1);
108	vport->dev->priv_flags |= IFF_OVS_DATAPATH;
109	rtnl_unlock();
110
111	return vport;
112
113error_master_upper_dev_unlink:
114	netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp));
115error_unlock:
116	rtnl_unlock();
117error_put:
118	dev_put(vport->dev);
119error_free_vport:
120	ovs_vport_free(vport);
121	return ERR_PTR(err);
122}
123EXPORT_SYMBOL_GPL(ovs_netdev_link);
124
125static struct vport *netdev_create(const struct vport_parms *parms)
126{
127	struct vport *vport;
128
129	vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms);
130	if (IS_ERR(vport))
131		return vport;
132
133	return ovs_netdev_link(vport, parms->name);
134}
135
136static void vport_netdev_free(struct rcu_head *rcu)
137{
138	struct vport *vport = container_of(rcu, struct vport, rcu);
139
140	if (vport->dev)
141		dev_put(vport->dev);
142	ovs_vport_free(vport);
143}
144
145void ovs_netdev_detach_dev(struct vport *vport)
146{
147	ASSERT_RTNL();
148	vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
149	netdev_rx_handler_unregister(vport->dev);
150	netdev_upper_dev_unlink(vport->dev,
151				netdev_master_upper_dev_get(vport->dev));
152	dev_set_promiscuity(vport->dev, -1);
153}
154
155static void netdev_destroy(struct vport *vport)
156{
157	rtnl_lock();
158	if (netif_is_ovs_port(vport->dev))
159		ovs_netdev_detach_dev(vport);
160	rtnl_unlock();
161
162	call_rcu(&vport->rcu, vport_netdev_free);
163}
164
165void ovs_netdev_tunnel_destroy(struct vport *vport)
166{
167	rtnl_lock();
168	if (netif_is_ovs_port(vport->dev))
169		ovs_netdev_detach_dev(vport);
170
171	/* We can be invoked by both explicit vport deletion and
172	 * underlying netdev deregistration; delete the link only
173	 * if it's not already shutting down.
174	 */
175	if (vport->dev->reg_state == NETREG_REGISTERED)
176		rtnl_delete_link(vport->dev);
177	dev_put(vport->dev);
178	vport->dev = NULL;
179	rtnl_unlock();
180
181	call_rcu(&vport->rcu, vport_netdev_free);
182}
183EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy);
184
185/* Returns null if this device is not attached to a datapath. */
186struct vport *ovs_netdev_get_vport(struct net_device *dev)
187{
188	if (likely(netif_is_ovs_port(dev)))
189		return (struct vport *)
190			rcu_dereference_rtnl(dev->rx_handler_data);
191	else
192		return NULL;
193}
194
195static struct vport_ops ovs_netdev_vport_ops = {
196	.type		= OVS_VPORT_TYPE_NETDEV,
197	.create		= netdev_create,
198	.destroy	= netdev_destroy,
199	.send		= dev_queue_xmit,
200};
201
202int __init ovs_netdev_init(void)
203{
204	return ovs_vport_ops_register(&ovs_netdev_vport_ops);
205}
206
207void ovs_netdev_exit(void)
208{
209	ovs_vport_ops_unregister(&ovs_netdev_vport_ops);
210}
v6.13.7
  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (c) 2007-2012 Nicira, Inc.
  4 */
  5
  6#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  7
  8#include <linux/if_arp.h>
  9#include <linux/if_bridge.h>
 10#include <linux/if_vlan.h>
 11#include <linux/kernel.h>
 12#include <linux/llc.h>
 13#include <linux/rtnetlink.h>
 14#include <linux/skbuff.h>
 15#include <linux/openvswitch.h>
 16#include <linux/export.h>
 17
 18#include <net/ip_tunnels.h>
 19#include <net/rtnetlink.h>
 20
 21#include "datapath.h"
 22#include "vport.h"
 23#include "vport-internal_dev.h"
 24#include "vport-netdev.h"
 25
 26static struct vport_ops ovs_netdev_vport_ops;
 27
 28/* Must be called with rcu_read_lock. */
 29static void netdev_port_receive(struct sk_buff *skb)
 30{
 31	struct vport *vport;
 32
 33	vport = ovs_netdev_get_vport(skb->dev);
 34	if (unlikely(!vport))
 35		goto error;
 36
 37	if (unlikely(skb_warn_if_lro(skb)))
 38		goto error;
 39
 40	/* Make our own copy of the packet.  Otherwise we will mangle the
 41	 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
 42	 */
 43	skb = skb_share_check(skb, GFP_ATOMIC);
 44	if (unlikely(!skb))
 45		return;
 46
 47	if (skb->dev->type == ARPHRD_ETHER)
 48		skb_push_rcsum(skb, ETH_HLEN);
 49
 50	ovs_vport_receive(vport, skb, skb_tunnel_info(skb));
 51	return;
 52error:
 53	kfree_skb(skb);
 54}
 55
 56/* Called with rcu_read_lock and bottom-halves disabled. */
 57static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
 58{
 59	struct sk_buff *skb = *pskb;
 60
 61	if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
 62		return RX_HANDLER_PASS;
 63
 64	netdev_port_receive(skb);
 65	return RX_HANDLER_CONSUMED;
 66}
 67
 68static struct net_device *get_dpdev(const struct datapath *dp)
 69{
 70	struct vport *local;
 71
 72	local = ovs_vport_ovsl(dp, OVSP_LOCAL);
 73	return local->dev;
 74}
 75
 76struct vport *ovs_netdev_link(struct vport *vport, const char *name)
 77{
 78	int err;
 79
 80	vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name);
 81	if (!vport->dev) {
 82		err = -ENODEV;
 83		goto error_free_vport;
 84	}
 85	/* Ensure that the device exists and that the provided
 86	 * name is not one of its aliases.
 87	 */
 88	if (strcmp(name, ovs_vport_name(vport))) {
 89		err = -ENODEV;
 90		goto error_put;
 91	}
 92	netdev_tracker_alloc(vport->dev, &vport->dev_tracker, GFP_KERNEL);
 93	if (vport->dev->flags & IFF_LOOPBACK ||
 94	    (vport->dev->type != ARPHRD_ETHER &&
 95	     vport->dev->type != ARPHRD_NONE) ||
 96	    ovs_is_internal_dev(vport->dev)) {
 97		err = -EINVAL;
 98		goto error_put;
 99	}
100
101	rtnl_lock();
102	err = netdev_master_upper_dev_link(vport->dev,
103					   get_dpdev(vport->dp),
104					   NULL, NULL, NULL);
105	if (err)
106		goto error_unlock;
107
108	err = netdev_rx_handler_register(vport->dev, netdev_frame_hook,
109					 vport);
110	if (err)
111		goto error_master_upper_dev_unlink;
112
113	dev_disable_lro(vport->dev);
114	dev_set_promiscuity(vport->dev, 1);
115	vport->dev->priv_flags |= IFF_OVS_DATAPATH;
116	rtnl_unlock();
117
118	return vport;
119
120error_master_upper_dev_unlink:
121	netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp));
122error_unlock:
123	rtnl_unlock();
124error_put:
125	netdev_put(vport->dev, &vport->dev_tracker);
126error_free_vport:
127	ovs_vport_free(vport);
128	return ERR_PTR(err);
129}
130EXPORT_SYMBOL_GPL(ovs_netdev_link);
131
132static struct vport *netdev_create(const struct vport_parms *parms)
133{
134	struct vport *vport;
135
136	vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms);
137	if (IS_ERR(vport))
138		return vport;
139
140	return ovs_netdev_link(vport, parms->name);
141}
142
143static void vport_netdev_free(struct rcu_head *rcu)
144{
145	struct vport *vport = container_of(rcu, struct vport, rcu);
146
147	netdev_put(vport->dev, &vport->dev_tracker);
 
148	ovs_vport_free(vport);
149}
150
151void ovs_netdev_detach_dev(struct vport *vport)
152{
153	ASSERT_RTNL();
154	vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
155	netdev_rx_handler_unregister(vport->dev);
156	netdev_upper_dev_unlink(vport->dev,
157				netdev_master_upper_dev_get(vport->dev));
158	dev_set_promiscuity(vport->dev, -1);
159}
160
161static void netdev_destroy(struct vport *vport)
162{
163	rtnl_lock();
164	if (netif_is_ovs_port(vport->dev))
165		ovs_netdev_detach_dev(vport);
166	rtnl_unlock();
167
168	call_rcu(&vport->rcu, vport_netdev_free);
169}
170
171void ovs_netdev_tunnel_destroy(struct vport *vport)
172{
173	rtnl_lock();
174	if (netif_is_ovs_port(vport->dev))
175		ovs_netdev_detach_dev(vport);
176
177	/* We can be invoked by both explicit vport deletion and
178	 * underlying netdev deregistration; delete the link only
179	 * if it's not already shutting down.
180	 */
181	if (vport->dev->reg_state == NETREG_REGISTERED)
182		rtnl_delete_link(vport->dev, 0, NULL);
183	netdev_put(vport->dev, &vport->dev_tracker);
184	vport->dev = NULL;
185	rtnl_unlock();
186
187	call_rcu(&vport->rcu, vport_netdev_free);
188}
189EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy);
190
191/* Returns null if this device is not attached to a datapath. */
192struct vport *ovs_netdev_get_vport(struct net_device *dev)
193{
194	if (likely(netif_is_ovs_port(dev)))
195		return (struct vport *)
196			rcu_dereference_rtnl(dev->rx_handler_data);
197	else
198		return NULL;
199}
200
201static struct vport_ops ovs_netdev_vport_ops = {
202	.type		= OVS_VPORT_TYPE_NETDEV,
203	.create		= netdev_create,
204	.destroy	= netdev_destroy,
205	.send		= dev_queue_xmit,
206};
207
208int __init ovs_netdev_init(void)
209{
210	return ovs_vport_ops_register(&ovs_netdev_vport_ops);
211}
212
213void ovs_netdev_exit(void)
214{
215	ovs_vport_ops_unregister(&ovs_netdev_vport_ops);
216}