1/*
2 * Copyright (c) 2007-2012 Nicira, Inc.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
16 * 02110-1301, USA
17 */
18
19#include <linux/hardirq.h>
20#include <linux/if_vlan.h>
21#include <linux/kernel.h>
22#include <linux/netdevice.h>
23#include <linux/etherdevice.h>
24#include <linux/ethtool.h>
25#include <linux/skbuff.h>
26
27#include <net/dst.h>
28#include <net/xfrm.h>
29#include <net/rtnetlink.h>
30
31#include "datapath.h"
32#include "vport-internal_dev.h"
33#include "vport-netdev.h"
34
35struct internal_dev {
36	struct vport *vport;
37};
38
39static struct vport_ops ovs_internal_vport_ops;
40
41static struct internal_dev *internal_dev_priv(struct net_device *netdev)
42{
43	return netdev_priv(netdev);
44}
45
46/* This function is only called by the kernel network layer.*/
47static struct rtnl_link_stats64 *internal_dev_get_stats(struct net_device *netdev,
48							struct rtnl_link_stats64 *stats)
49{
50	struct vport *vport = ovs_internal_dev_get_vport(netdev);
51	struct ovs_vport_stats vport_stats;
52
53	ovs_vport_get_stats(vport, &vport_stats);
54
55	/* The tx and rx stats need to be swapped because the
56	 * switch and host OS have opposite perspectives. */
57	stats->rx_packets	= vport_stats.tx_packets;
58	stats->tx_packets	= vport_stats.rx_packets;
59	stats->rx_bytes		= vport_stats.tx_bytes;
60	stats->tx_bytes		= vport_stats.rx_bytes;
61	stats->rx_errors	= vport_stats.tx_errors;
62	stats->tx_errors	= vport_stats.rx_errors;
63	stats->rx_dropped	= vport_stats.tx_dropped;
64	stats->tx_dropped	= vport_stats.rx_dropped;
65
66	return stats;
67}
68
69/* Called with rcu_read_lock_bh. */
70static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
71{
72	rcu_read_lock();
73	ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);
74	rcu_read_unlock();
75	return 0;
76}
77
78static int internal_dev_open(struct net_device *netdev)
79{
80	netif_start_queue(netdev);
81	return 0;
82}
83
84static int internal_dev_stop(struct net_device *netdev)
85{
86	netif_stop_queue(netdev);
87	return 0;
88}
89
90static void internal_dev_getinfo(struct net_device *netdev,
91				 struct ethtool_drvinfo *info)
92{
93	strlcpy(info->driver, "openvswitch", sizeof(info->driver));
94}
95
96static const struct ethtool_ops internal_dev_ethtool_ops = {
97	.get_drvinfo	= internal_dev_getinfo,
98	.get_link	= ethtool_op_get_link,
99};
100
101static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
102{
103	if (new_mtu < 68)
104		return -EINVAL;
105
106	netdev->mtu = new_mtu;
107	return 0;
108}
109
110static void internal_dev_destructor(struct net_device *dev)
111{
112	struct vport *vport = ovs_internal_dev_get_vport(dev);
113
114	ovs_vport_free(vport);
115	free_netdev(dev);
116}
117
118static const struct net_device_ops internal_dev_netdev_ops = {
119	.ndo_open = internal_dev_open,
120	.ndo_stop = internal_dev_stop,
121	.ndo_start_xmit = internal_dev_xmit,
122	.ndo_set_mac_address = eth_mac_addr,
123	.ndo_change_mtu = internal_dev_change_mtu,
124	.ndo_get_stats64 = internal_dev_get_stats,
125};
126
127static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
128	.kind = "openvswitch",
129};
130
131static void do_setup(struct net_device *netdev)
132{
133	ether_setup(netdev);
134
135	netdev->netdev_ops = &internal_dev_netdev_ops;
136
137	netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
138	netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
139	netdev->destructor = internal_dev_destructor;
140	netdev->ethtool_ops = &internal_dev_ethtool_ops;
141	netdev->rtnl_link_ops = &internal_dev_link_ops;
142	netdev->tx_queue_len = 0;
143
144	netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
145			   NETIF_F_HIGHDMA | NETIF_F_HW_CSUM |
146			   NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL;
147
148	netdev->vlan_features = netdev->features;
149	netdev->hw_enc_features = netdev->features;
150	netdev->features |= NETIF_F_HW_VLAN_CTAG_TX;
151	netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
152
153	eth_hw_addr_random(netdev);
154}
155
156static struct vport *internal_dev_create(const struct vport_parms *parms)
157{
158	struct vport *vport;
159	struct netdev_vport *netdev_vport;
160	struct internal_dev *internal_dev;
161	int err;
162
163	vport = ovs_vport_alloc(sizeof(struct netdev_vport),
164				&ovs_internal_vport_ops, parms);
165	if (IS_ERR(vport)) {
166		err = PTR_ERR(vport);
167		goto error;
168	}
169
170	netdev_vport = netdev_vport_priv(vport);
171
172	netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev),
173					 parms->name, NET_NAME_UNKNOWN,
174					 do_setup);
175	if (!netdev_vport->dev) {
176		err = -ENOMEM;
177		goto error_free_vport;
178	}
179
180	dev_net_set(netdev_vport->dev, ovs_dp_get_net(vport->dp));
181	internal_dev = internal_dev_priv(netdev_vport->dev);
182	internal_dev->vport = vport;
183
184	/* Restrict bridge port to current netns. */
185	if (vport->port_no == OVSP_LOCAL)
186		netdev_vport->dev->features |= NETIF_F_NETNS_LOCAL;
187
188	rtnl_lock();
189	err = register_netdevice(netdev_vport->dev);
190	if (err)
191		goto error_free_netdev;
192
193	dev_set_promiscuity(netdev_vport->dev, 1);
194	rtnl_unlock();
195	netif_start_queue(netdev_vport->dev);
196
197	return vport;
198
199error_free_netdev:
200	rtnl_unlock();
201	free_netdev(netdev_vport->dev);
202error_free_vport:
203	ovs_vport_free(vport);
204error:
205	return ERR_PTR(err);
206}
207
208static void internal_dev_destroy(struct vport *vport)
209{
210	struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
211
212	netif_stop_queue(netdev_vport->dev);
213	rtnl_lock();
214	dev_set_promiscuity(netdev_vport->dev, -1);
215
216	/* unregister_netdevice() waits for an RCU grace period. */
217	unregister_netdevice(netdev_vport->dev);
218
219	rtnl_unlock();
220}
221
222static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
223{
224	struct net_device *netdev = netdev_vport_priv(vport)->dev;
225	int len;
226
227	if (unlikely(!(netdev->flags & IFF_UP))) {
228		kfree_skb(skb);
229		return 0;
230	}
231
232	len = skb->len;
233
234	skb_dst_drop(skb);
235	nf_reset(skb);
236	secpath_reset(skb);
237
238	skb->dev = netdev;
239	skb->pkt_type = PACKET_HOST;
240	skb->protocol = eth_type_trans(skb, netdev);
241	skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
242
243	netif_rx(skb);
244
245	return len;
246}
247
248static struct vport_ops ovs_internal_vport_ops = {
249	.type		= OVS_VPORT_TYPE_INTERNAL,
250	.create		= internal_dev_create,
251	.destroy	= internal_dev_destroy,
252	.get_name	= ovs_netdev_get_name,
253	.send		= internal_dev_recv,
254};
255
256int ovs_is_internal_dev(const struct net_device *netdev)
257{
258	return netdev->netdev_ops == &internal_dev_netdev_ops;
259}
260
261struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
262{
263	if (!ovs_is_internal_dev(netdev))
264		return NULL;
265
266	return internal_dev_priv(netdev)->vport;
267}
268
269int ovs_internal_dev_rtnl_link_register(void)
270{
271	int err;
272
273	err = rtnl_link_register(&internal_dev_link_ops);
274	if (err < 0)
275		return err;
276
277	err = ovs_vport_ops_register(&ovs_internal_vport_ops);
278	if (err < 0)
279		rtnl_link_unregister(&internal_dev_link_ops);
280
281	return err;
282}
283
284void ovs_internal_dev_rtnl_link_unregister(void)
285{
286	ovs_vport_ops_unregister(&ovs_internal_vport_ops);
287	rtnl_link_unregister(&internal_dev_link_ops);
288}
289