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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2007-2012 Nicira, Inc.
4 */
5
6#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7
8#include <linux/if_arp.h>
9#include <linux/if_bridge.h>
10#include <linux/if_vlan.h>
11#include <linux/kernel.h>
12#include <linux/llc.h>
13#include <linux/rtnetlink.h>
14#include <linux/skbuff.h>
15#include <linux/openvswitch.h>
16#include <linux/export.h>
17
18#include <net/ip_tunnels.h>
19#include <net/rtnetlink.h>
20
21#include "datapath.h"
22#include "vport.h"
23#include "vport-internal_dev.h"
24#include "vport-netdev.h"
25
26static struct vport_ops ovs_netdev_vport_ops;
27
28/* Must be called with rcu_read_lock. */
29static void netdev_port_receive(struct sk_buff *skb)
30{
31 struct vport *vport;
32
33 vport = ovs_netdev_get_vport(skb->dev);
34 if (unlikely(!vport))
35 goto error;
36
37 if (unlikely(skb_warn_if_lro(skb)))
38 goto error;
39
40 /* Make our own copy of the packet. Otherwise we will mangle the
41 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
42 */
43 skb = skb_share_check(skb, GFP_ATOMIC);
44 if (unlikely(!skb))
45 return;
46
47 if (skb->dev->type == ARPHRD_ETHER)
48 skb_push_rcsum(skb, ETH_HLEN);
49
50 ovs_vport_receive(vport, skb, skb_tunnel_info(skb));
51 return;
52error:
53 kfree_skb(skb);
54}
55
56/* Called with rcu_read_lock and bottom-halves disabled. */
57static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
58{
59 struct sk_buff *skb = *pskb;
60
61 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
62 return RX_HANDLER_PASS;
63
64 netdev_port_receive(skb);
65 return RX_HANDLER_CONSUMED;
66}
67
68static struct net_device *get_dpdev(const struct datapath *dp)
69{
70 struct vport *local;
71
72 local = ovs_vport_ovsl(dp, OVSP_LOCAL);
73 return local->dev;
74}
75
76static struct vport *ovs_netdev_link(struct vport *vport)
77{
78 int err;
79
80 if (WARN_ON_ONCE(!vport->dev)) {
81 err = -ENODEV;
82 goto error_free_vport;
83 }
84
85 rtnl_lock();
86 /* Do not link devices that are not registered to avoid a potential
87 * race with the NETDEV_UNREGISTER notification in dp_device_event().
88 */
89 if (vport->dev->reg_state != NETREG_REGISTERED) {
90 err = -ENODEV;
91 goto error_put_unlock;
92 }
93
94 err = netdev_master_upper_dev_link(vport->dev,
95 get_dpdev(vport->dp),
96 NULL, NULL, NULL);
97 if (err)
98 goto error_put_unlock;
99
100 err = netdev_rx_handler_register(vport->dev, netdev_frame_hook,
101 vport);
102 if (err)
103 goto error_master_upper_dev_unlink;
104
105 dev_disable_lro(vport->dev);
106 dev_set_promiscuity(vport->dev, 1);
107 vport->dev->priv_flags |= IFF_OVS_DATAPATH;
108 rtnl_unlock();
109
110 return vport;
111
112error_master_upper_dev_unlink:
113 netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp));
114error_put_unlock:
115 netdev_put(vport->dev, &vport->dev_tracker);
116 rtnl_unlock();
117error_free_vport:
118 ovs_vport_free(vport);
119 return ERR_PTR(err);
120}
121
122static struct vport *netdev_create(const struct vport_parms *parms)
123{
124 struct vport *vport;
125 int err;
126
127 vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms);
128 if (IS_ERR(vport))
129 return vport;
130
131 vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), parms->name);
132 if (!vport->dev) {
133 err = -ENODEV;
134 goto error_free_vport;
135 }
136 netdev_tracker_alloc(vport->dev, &vport->dev_tracker, GFP_KERNEL);
137
138 /* Ensure that the provided name is not an alias. */
139 if (strcmp(parms->name, ovs_vport_name(vport))) {
140 err = -ENODEV;
141 goto error_put;
142 }
143
144 if (vport->dev->flags & IFF_LOOPBACK ||
145 (vport->dev->type != ARPHRD_ETHER &&
146 vport->dev->type != ARPHRD_NONE) ||
147 ovs_is_internal_dev(vport->dev)) {
148 err = -EINVAL;
149 goto error_put;
150 }
151
152 return ovs_netdev_link(vport);
153error_put:
154 netdev_put(vport->dev, &vport->dev_tracker);
155error_free_vport:
156 ovs_vport_free(vport);
157 return ERR_PTR(err);
158}
159
160static void vport_netdev_free(struct rcu_head *rcu)
161{
162 struct vport *vport = container_of(rcu, struct vport, rcu);
163
164 netdev_put(vport->dev, &vport->dev_tracker);
165 ovs_vport_free(vport);
166}
167
168void ovs_netdev_detach_dev(struct vport *vport)
169{
170 ASSERT_RTNL();
171 netdev_rx_handler_unregister(vport->dev);
172 netdev_upper_dev_unlink(vport->dev,
173 netdev_master_upper_dev_get(vport->dev));
174 dev_set_promiscuity(vport->dev, -1);
175
176 /* paired with smp_mb() in netdev_destroy() */
177 smp_wmb();
178
179 vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
180}
181
182static void netdev_destroy(struct vport *vport)
183{
184 /* When called from ovs_db_notify_wq() after a dp_device_event(), the
185 * port has already been detached, so we can avoid taking the RTNL by
186 * checking this first.
187 */
188 if (netif_is_ovs_port(vport->dev)) {
189 rtnl_lock();
190 /* Check again while holding the lock to ensure we don't race
191 * with the netdev notifier and detach twice.
192 */
193 if (netif_is_ovs_port(vport->dev))
194 ovs_netdev_detach_dev(vport);
195 rtnl_unlock();
196 }
197
198 /* paired with smp_wmb() in ovs_netdev_detach_dev() */
199 smp_mb();
200
201 call_rcu(&vport->rcu, vport_netdev_free);
202}
203
204/* Returns null if this device is not attached to a datapath. */
205struct vport *ovs_netdev_get_vport(struct net_device *dev)
206{
207 if (likely(netif_is_ovs_port(dev)))
208 return (struct vport *)
209 rcu_dereference_rtnl(dev->rx_handler_data);
210 else
211 return NULL;
212}
213
214static struct vport_ops ovs_netdev_vport_ops = {
215 .type = OVS_VPORT_TYPE_NETDEV,
216 .create = netdev_create,
217 .destroy = netdev_destroy,
218 .send = dev_queue_xmit,
219};
220
221int __init ovs_netdev_init(void)
222{
223 return ovs_vport_ops_register(&ovs_netdev_vport_ops);
224}
225
226void ovs_netdev_exit(void)
227{
228 ovs_vport_ops_unregister(&ovs_netdev_vport_ops);
229}