1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2007-2012 Nicira, Inc.
4 */
5
6#include <linux/if_vlan.h>
7#include <linux/kernel.h>
8#include <linux/netdevice.h>
9#include <linux/etherdevice.h>
10#include <linux/ethtool.h>
11#include <linux/skbuff.h>
12
13#include <net/dst.h>
14#include <net/xfrm.h>
15#include <net/rtnetlink.h>
16
17#include "datapath.h"
18#include "vport-internal_dev.h"
19#include "vport-netdev.h"
20
21struct internal_dev {
22	struct vport *vport;
23};
24
25static struct vport_ops ovs_internal_vport_ops;
26
27static struct internal_dev *internal_dev_priv(struct net_device *netdev)
28{
29	return netdev_priv(netdev);
30}
31
32/* Called with rcu_read_lock_bh. */
33static netdev_tx_t
34internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
35{
36	int len, err;
37
38	/* store len value because skb can be freed inside ovs_vport_receive() */
39	len = skb->len;
40
41	rcu_read_lock();
42	err = ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);
43	rcu_read_unlock();
44
45	if (likely(!err))
46		dev_sw_netstats_tx_add(netdev, 1, len);
47	else
48		netdev->stats.tx_errors++;
49
50	return NETDEV_TX_OK;
51}
52
53static int internal_dev_open(struct net_device *netdev)
54{
55	netif_start_queue(netdev);
56	return 0;
57}
58
59static int internal_dev_stop(struct net_device *netdev)
60{
61	netif_stop_queue(netdev);
62	return 0;
63}
64
65static void internal_dev_getinfo(struct net_device *netdev,
66				 struct ethtool_drvinfo *info)
67{
68	strscpy(info->driver, "openvswitch", sizeof(info->driver));
69}
70
71static const struct ethtool_ops internal_dev_ethtool_ops = {
72	.get_drvinfo	= internal_dev_getinfo,
73	.get_link	= ethtool_op_get_link,
74};
75
76static void internal_dev_destructor(struct net_device *dev)
77{
78	struct vport *vport = ovs_internal_dev_get_vport(dev);
79
80	ovs_vport_free(vport);
81}
82
83static const struct net_device_ops internal_dev_netdev_ops = {
84	.ndo_open = internal_dev_open,
85	.ndo_stop = internal_dev_stop,
86	.ndo_start_xmit = internal_dev_xmit,
87	.ndo_set_mac_address = eth_mac_addr,
88	.ndo_get_stats64 = dev_get_tstats64,
89};
90
91static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
92	.kind = "openvswitch",
93};
94
95static void do_setup(struct net_device *netdev)
96{
97	ether_setup(netdev);
98
99	netdev->max_mtu = ETH_MAX_MTU;
100
101	netdev->netdev_ops = &internal_dev_netdev_ops;
102
103	netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
104	netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH |
105			      IFF_NO_QUEUE;
106	netdev->needs_free_netdev = true;
107	netdev->priv_destructor = NULL;
108	netdev->ethtool_ops = &internal_dev_ethtool_ops;
109	netdev->rtnl_link_ops = &internal_dev_link_ops;
110
111	netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
112			   NETIF_F_HIGHDMA | NETIF_F_HW_CSUM |
113			   NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL;
114
115	netdev->vlan_features = netdev->features;
116	netdev->hw_enc_features = netdev->features;
117	netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
118	netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
119
120	eth_hw_addr_random(netdev);
121}
122
123static struct vport *internal_dev_create(const struct vport_parms *parms)
124{
125	struct vport *vport;
126	struct internal_dev *internal_dev;
127	struct net_device *dev;
128	int err;
129
130	vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms);
131	if (IS_ERR(vport)) {
132		err = PTR_ERR(vport);
133		goto error;
134	}
135
136	dev = alloc_netdev(sizeof(struct internal_dev),
137			   parms->name, NET_NAME_USER, do_setup);
138	vport->dev = dev;
139	if (!vport->dev) {
140		err = -ENOMEM;
141		goto error_free_vport;
142	}
143	vport->dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
144	if (!vport->dev->tstats) {
145		err = -ENOMEM;
146		goto error_free_netdev;
147	}
148
149	dev_net_set(vport->dev, ovs_dp_get_net(vport->dp));
150	dev->ifindex = parms->desired_ifindex;
151	internal_dev = internal_dev_priv(vport->dev);
152	internal_dev->vport = vport;
153
154	/* Restrict bridge port to current netns. */
155	if (vport->port_no == OVSP_LOCAL)
156		vport->dev->features |= NETIF_F_NETNS_LOCAL;
157
158	rtnl_lock();
159	err = register_netdevice(vport->dev);
160	if (err)
161		goto error_unlock;
162	vport->dev->priv_destructor = internal_dev_destructor;
163
164	dev_set_promiscuity(vport->dev, 1);
165	rtnl_unlock();
166	netif_start_queue(vport->dev);
167
168	return vport;
169
170error_unlock:
171	rtnl_unlock();
172	free_percpu(dev->tstats);
173error_free_netdev:
174	free_netdev(dev);
175error_free_vport:
176	ovs_vport_free(vport);
177error:
178	return ERR_PTR(err);
179}
180
181static void internal_dev_destroy(struct vport *vport)
182{
183	netif_stop_queue(vport->dev);
184	rtnl_lock();
185	dev_set_promiscuity(vport->dev, -1);
186
187	/* unregister_netdevice() waits for an RCU grace period. */
188	unregister_netdevice(vport->dev);
189	free_percpu(vport->dev->tstats);
190	rtnl_unlock();
191}
192
193static int internal_dev_recv(struct sk_buff *skb)
194{
195	struct net_device *netdev = skb->dev;
196
197	if (unlikely(!(netdev->flags & IFF_UP))) {
198		kfree_skb(skb);
199		netdev->stats.rx_dropped++;
200		return NETDEV_TX_OK;
201	}
202
203	skb_dst_drop(skb);
204	nf_reset_ct(skb);
205	secpath_reset(skb);
206
207	skb->pkt_type = PACKET_HOST;
208	skb->protocol = eth_type_trans(skb, netdev);
209	skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
210	dev_sw_netstats_rx_add(netdev, skb->len);
211
212	netif_rx(skb);
213	return NETDEV_TX_OK;
214}
215
216static struct vport_ops ovs_internal_vport_ops = {
217	.type		= OVS_VPORT_TYPE_INTERNAL,
218	.create		= internal_dev_create,
219	.destroy	= internal_dev_destroy,
220	.send		= internal_dev_recv,
221};
222
223int ovs_is_internal_dev(const struct net_device *netdev)
224{
225	return netdev->netdev_ops == &internal_dev_netdev_ops;
226}
227
228struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
229{
230	if (!ovs_is_internal_dev(netdev))
231		return NULL;
232
233	return internal_dev_priv(netdev)->vport;
234}
235
236int ovs_internal_dev_rtnl_link_register(void)
237{
238	int err;
239
240	err = rtnl_link_register(&internal_dev_link_ops);
241	if (err < 0)
242		return err;
243
244	err = ovs_vport_ops_register(&ovs_internal_vport_ops);
245	if (err < 0)
246		rtnl_link_unregister(&internal_dev_link_ops);
247
248	return err;
249}
250
251void ovs_internal_dev_rtnl_link_unregister(void)
252{
253	ovs_vport_ops_unregister(&ovs_internal_vport_ops);
254	rtnl_link_unregister(&internal_dev_link_ops);
255}
256