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247 lines · 5.5 KiB

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};
89
90static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
91 .kind = "openvswitch",
92};
93
94static void do_setup(struct net_device *netdev)
95{
96 ether_setup(netdev);
97
98 netdev->max_mtu = ETH_MAX_MTU;
99
100 netdev->netdev_ops = &internal_dev_netdev_ops;
101
102 netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
103 netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH |
104 IFF_NO_QUEUE;
105 netdev->lltx = true;
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_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
112 NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE |
113 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;
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 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
144
145 dev_net_set(vport->dev, ovs_dp_get_net(vport->dp));
146 dev->ifindex = parms->desired_ifindex;
147 internal_dev = internal_dev_priv(vport->dev);
148 internal_dev->vport = vport;
149
150 /* Restrict bridge port to current netns. */
151 if (vport->port_no == OVSP_LOCAL)
152 vport->dev->netns_immutable = true;
153
154 rtnl_lock();
155 err = register_netdevice(vport->dev);
156 if (err)
157 goto error_unlock;
158 vport->dev->priv_destructor = internal_dev_destructor;
159
160 dev_set_promiscuity(vport->dev, 1);
161 rtnl_unlock();
162 netif_start_queue(vport->dev);
163
164 return vport;
165
166error_unlock:
167 rtnl_unlock();
168 free_netdev(dev);
169error_free_vport:
170 ovs_vport_free(vport);
171error:
172 return ERR_PTR(err);
173}
174
175static void internal_dev_destroy(struct vport *vport)
176{
177 netif_stop_queue(vport->dev);
178 rtnl_lock();
179 dev_set_promiscuity(vport->dev, -1);
180
181 /* unregister_netdevice() waits for an RCU grace period. */
182 unregister_netdevice(vport->dev);
183 rtnl_unlock();
184}
185
186static int internal_dev_recv(struct sk_buff *skb)
187{
188 struct net_device *netdev = skb->dev;
189
190 if (unlikely(!(netdev->flags & IFF_UP))) {
191 kfree_skb(skb);
192 netdev->stats.rx_dropped++;
193 return NETDEV_TX_OK;
194 }
195
196 skb_dst_drop(skb);
197 nf_reset_ct(skb);
198
199 skb->pkt_type = PACKET_HOST;
200 skb->protocol = eth_type_trans(skb, netdev);
201 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
202 dev_sw_netstats_rx_add(netdev, skb->len);
203
204 netif_rx(skb);
205 return NETDEV_TX_OK;
206}
207
208static struct vport_ops ovs_internal_vport_ops = {
209 .type = OVS_VPORT_TYPE_INTERNAL,
210 .create = internal_dev_create,
211 .destroy = internal_dev_destroy,
212 .send = internal_dev_recv,
213};
214
215int ovs_is_internal_dev(const struct net_device *netdev)
216{
217 return netdev->netdev_ops == &internal_dev_netdev_ops;
218}
219
220struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
221{
222 if (!ovs_is_internal_dev(netdev))
223 return NULL;
224
225 return internal_dev_priv(netdev)->vport;
226}
227
228int ovs_internal_dev_rtnl_link_register(void)
229{
230 int err;
231
232 err = rtnl_link_register(&internal_dev_link_ops);
233 if (err < 0)
234 return err;
235
236 err = ovs_vport_ops_register(&ovs_internal_vport_ops);
237 if (err < 0)
238 rtnl_link_unregister(&internal_dev_link_ops);
239
240 return err;
241}
242
243void ovs_internal_dev_rtnl_link_unregister(void)
244{
245 ovs_vport_ops_unregister(&ovs_internal_vport_ops);
246 rtnl_link_unregister(&internal_dev_link_ops);
247}