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 
35 struct internal_dev {
36 	struct vport *vport;
37 };
38 
39 static struct vport_ops ovs_internal_vport_ops;
40 
41 static struct internal_dev *internal_dev_priv(struct net_device *netdev)
42 {
43 	return netdev_priv(netdev);
44 }
45 
46 /* Called with rcu_read_lock_bh. */
47 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
48 {
49 	int len, err;
50 
51 	len = skb->len;
52 	rcu_read_lock();
53 	err = ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);
54 	rcu_read_unlock();
55 
56 	if (likely(!err)) {
57 		struct pcpu_sw_netstats *tstats = this_cpu_ptr(netdev->tstats);
58 
59 		u64_stats_update_begin(&tstats->syncp);
60 		tstats->tx_bytes += len;
61 		tstats->tx_packets++;
62 		u64_stats_update_end(&tstats->syncp);
63 	} else {
64 		netdev->stats.tx_errors++;
65 	}
66 	return 0;
67 }
68 
69 static int internal_dev_open(struct net_device *netdev)
70 {
71 	netif_start_queue(netdev);
72 	return 0;
73 }
74 
75 static int internal_dev_stop(struct net_device *netdev)
76 {
77 	netif_stop_queue(netdev);
78 	return 0;
79 }
80 
81 static void internal_dev_getinfo(struct net_device *netdev,
82 				 struct ethtool_drvinfo *info)
83 {
84 	strlcpy(info->driver, "openvswitch", sizeof(info->driver));
85 }
86 
87 static const struct ethtool_ops internal_dev_ethtool_ops = {
88 	.get_drvinfo	= internal_dev_getinfo,
89 	.get_link	= ethtool_op_get_link,
90 };
91 
92 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
93 {
94 	if (new_mtu < 68)
95 		return -EINVAL;
96 
97 	netdev->mtu = new_mtu;
98 	return 0;
99 }
100 
101 static void internal_dev_destructor(struct net_device *dev)
102 {
103 	struct vport *vport = ovs_internal_dev_get_vport(dev);
104 
105 	ovs_vport_free(vport);
106 	free_netdev(dev);
107 }
108 
109 static const struct net_device_ops internal_dev_netdev_ops = {
110 	.ndo_open = internal_dev_open,
111 	.ndo_stop = internal_dev_stop,
112 	.ndo_start_xmit = internal_dev_xmit,
113 	.ndo_set_mac_address = eth_mac_addr,
114 	.ndo_change_mtu = internal_dev_change_mtu,
115 };
116 
117 static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
118 	.kind = "openvswitch",
119 };
120 
121 static void do_setup(struct net_device *netdev)
122 {
123 	ether_setup(netdev);
124 
125 	netdev->netdev_ops = &internal_dev_netdev_ops;
126 
127 	netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
128 	netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH;
129 	netdev->destructor = internal_dev_destructor;
130 	netdev->ethtool_ops = &internal_dev_ethtool_ops;
131 	netdev->rtnl_link_ops = &internal_dev_link_ops;
132 	netdev->tx_queue_len = 0;
133 
134 	netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
135 			   NETIF_F_HIGHDMA | NETIF_F_HW_CSUM |
136 			   NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL;
137 
138 	netdev->vlan_features = netdev->features;
139 	netdev->hw_enc_features = netdev->features;
140 	netdev->features |= NETIF_F_HW_VLAN_CTAG_TX;
141 	netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
142 
143 	eth_hw_addr_random(netdev);
144 }
145 
146 static struct vport *internal_dev_create(const struct vport_parms *parms)
147 {
148 	struct vport *vport;
149 	struct internal_dev *internal_dev;
150 	int err;
151 
152 	vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms);
153 	if (IS_ERR(vport)) {
154 		err = PTR_ERR(vport);
155 		goto error;
156 	}
157 
158 	vport->dev = alloc_netdev(sizeof(struct internal_dev),
159 				  parms->name, NET_NAME_UNKNOWN, do_setup);
160 	if (!vport->dev) {
161 		err = -ENOMEM;
162 		goto error_free_vport;
163 	}
164 
165 	dev_net_set(vport->dev, ovs_dp_get_net(vport->dp));
166 	internal_dev = internal_dev_priv(vport->dev);
167 	internal_dev->vport = vport;
168 
169 	/* Restrict bridge port to current netns. */
170 	if (vport->port_no == OVSP_LOCAL)
171 		vport->dev->features |= NETIF_F_NETNS_LOCAL;
172 
173 	rtnl_lock();
174 	err = register_netdevice(vport->dev);
175 	if (err)
176 		goto error_free_netdev;
177 
178 	dev_set_promiscuity(vport->dev, 1);
179 	rtnl_unlock();
180 	netif_start_queue(vport->dev);
181 
182 	return vport;
183 
184 error_free_netdev:
185 	rtnl_unlock();
186 	free_netdev(vport->dev);
187 error_free_vport:
188 	ovs_vport_free(vport);
189 error:
190 	return ERR_PTR(err);
191 }
192 
193 static void internal_dev_destroy(struct vport *vport)
194 {
195 	netif_stop_queue(vport->dev);
196 	rtnl_lock();
197 	dev_set_promiscuity(vport->dev, -1);
198 
199 	/* unregister_netdevice() waits for an RCU grace period. */
200 	unregister_netdevice(vport->dev);
201 
202 	rtnl_unlock();
203 }
204 
205 static void internal_dev_recv(struct vport *vport, struct sk_buff *skb)
206 {
207 	struct net_device *netdev = vport->dev;
208 	struct pcpu_sw_netstats *stats;
209 
210 	if (unlikely(!(netdev->flags & IFF_UP))) {
211 		kfree_skb(skb);
212 		netdev->stats.rx_dropped++;
213 		return;
214 	}
215 
216 	skb_dst_drop(skb);
217 	nf_reset(skb);
218 	secpath_reset(skb);
219 
220 	skb->dev = netdev;
221 	skb->pkt_type = PACKET_HOST;
222 	skb->protocol = eth_type_trans(skb, netdev);
223 	skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
224 
225 	stats = this_cpu_ptr(netdev->tstats);
226 	u64_stats_update_begin(&stats->syncp);
227 	stats->rx_packets++;
228 	stats->rx_bytes += skb->len;
229 	u64_stats_update_end(&stats->syncp);
230 
231 	netif_rx(skb);
232 }
233 
234 static struct vport_ops ovs_internal_vport_ops = {
235 	.type		= OVS_VPORT_TYPE_INTERNAL,
236 	.create		= internal_dev_create,
237 	.destroy	= internal_dev_destroy,
238 	.send		= internal_dev_recv,
239 };
240 
241 int ovs_is_internal_dev(const struct net_device *netdev)
242 {
243 	return netdev->netdev_ops == &internal_dev_netdev_ops;
244 }
245 
246 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
247 {
248 	if (!ovs_is_internal_dev(netdev))
249 		return NULL;
250 
251 	return internal_dev_priv(netdev)->vport;
252 }
253 
254 int ovs_internal_dev_rtnl_link_register(void)
255 {
256 	int err;
257 
258 	err = rtnl_link_register(&internal_dev_link_ops);
259 	if (err < 0)
260 		return err;
261 
262 	err = ovs_vport_ops_register(&ovs_internal_vport_ops);
263 	if (err < 0)
264 		rtnl_link_unregister(&internal_dev_link_ops);
265 
266 	return err;
267 }
268 
269 void ovs_internal_dev_rtnl_link_unregister(void)
270 {
271 	ovs_vport_ops_unregister(&ovs_internal_vport_ops);
272 	rtnl_link_unregister(&internal_dev_link_ops);
273 }
274