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
21 struct internal_dev {
22 struct vport *vport;
23 };
24
25 static struct vport_ops ovs_internal_vport_ops;
26
27 static 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. */
33 static netdev_tx_t
34 internal_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
53 static int internal_dev_open(struct net_device *netdev)
54 {
55 netif_start_queue(netdev);
56 return 0;
57 }
58
59 static int internal_dev_stop(struct net_device *netdev)
60 {
61 netif_stop_queue(netdev);
62 return 0;
63 }
64
65 static void internal_dev_getinfo(struct net_device *netdev,
66 struct ethtool_drvinfo *info)
67 {
68 strscpy(info->driver, "openvswitch", sizeof(info->driver));
69 }
70
71 static const struct ethtool_ops internal_dev_ethtool_ops = {
72 .get_drvinfo = internal_dev_getinfo,
73 .get_link = ethtool_op_get_link,
74 };
75
76 static 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
83 static 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
90 static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
91 .kind = "openvswitch",
92 };
93
94 static 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->needs_free_netdev = true;
106 netdev->priv_destructor = NULL;
107 netdev->ethtool_ops = &internal_dev_ethtool_ops;
108 netdev->rtnl_link_ops = &internal_dev_link_ops;
109
110 netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
111 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM |
112 NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL;
113
114 netdev->vlan_features = netdev->features;
115 netdev->hw_enc_features = netdev->features;
116 netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
117 netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
118
119 eth_hw_addr_random(netdev);
120 }
121
122 static struct vport *internal_dev_create(const struct vport_parms *parms)
123 {
124 struct vport *vport;
125 struct internal_dev *internal_dev;
126 struct net_device *dev;
127 int err;
128
129 vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms);
130 if (IS_ERR(vport)) {
131 err = PTR_ERR(vport);
132 goto error;
133 }
134
135 dev = alloc_netdev(sizeof(struct internal_dev),
136 parms->name, NET_NAME_USER, do_setup);
137 vport->dev = dev;
138 if (!vport->dev) {
139 err = -ENOMEM;
140 goto error_free_vport;
141 }
142 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
143
144 dev_net_set(vport->dev, ovs_dp_get_net(vport->dp));
145 dev->ifindex = parms->desired_ifindex;
146 internal_dev = internal_dev_priv(vport->dev);
147 internal_dev->vport = vport;
148
149 /* Restrict bridge port to current netns. */
150 if (vport->port_no == OVSP_LOCAL)
151 vport->dev->features |= NETIF_F_NETNS_LOCAL;
152
153 rtnl_lock();
154 err = register_netdevice(vport->dev);
155 if (err)
156 goto error_unlock;
157 vport->dev->priv_destructor = internal_dev_destructor;
158
159 dev_set_promiscuity(vport->dev, 1);
160 rtnl_unlock();
161 netif_start_queue(vport->dev);
162
163 return vport;
164
165 error_unlock:
166 rtnl_unlock();
167 free_netdev(dev);
168 error_free_vport:
169 ovs_vport_free(vport);
170 error:
171 return ERR_PTR(err);
172 }
173
174 static void internal_dev_destroy(struct vport *vport)
175 {
176 netif_stop_queue(vport->dev);
177 rtnl_lock();
178 dev_set_promiscuity(vport->dev, -1);
179
180 /* unregister_netdevice() waits for an RCU grace period. */
181 unregister_netdevice(vport->dev);
182 rtnl_unlock();
183 }
184
185 static int internal_dev_recv(struct sk_buff *skb)
186 {
187 struct net_device *netdev = skb->dev;
188
189 if (unlikely(!(netdev->flags & IFF_UP))) {
190 kfree_skb(skb);
191 netdev->stats.rx_dropped++;
192 return NETDEV_TX_OK;
193 }
194
195 skb_dst_drop(skb);
196 nf_reset_ct(skb);
197 secpath_reset(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
208 static 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
215 int ovs_is_internal_dev(const struct net_device *netdev)
216 {
217 return netdev->netdev_ops == &internal_dev_netdev_ops;
218 }
219
220 struct 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
228 int 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
243 void 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 }
248
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