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
26 static struct vport_ops ovs_netdev_vport_ops;
27
28 /* Must be called with rcu_read_lock. */
29 static 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(skb, ETH_HLEN);
49 skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
50 }
51 ovs_vport_receive(vport, skb, skb_tunnel_info(skb));
52 return;
53 error:
54 kfree_skb(skb);
55 }
56
57 /* Called with rcu_read_lock and bottom-halves disabled. */
58 static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
59 {
60 struct sk_buff *skb = *pskb;
61
62 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
63 return RX_HANDLER_PASS;
64
65 netdev_port_receive(skb);
66 return RX_HANDLER_CONSUMED;
67 }
68
69 static struct net_device *get_dpdev(const struct datapath *dp)
70 {
71 struct vport *local;
72
73 local = ovs_vport_ovsl(dp, OVSP_LOCAL);
74 return local->dev;
75 }
76
77 struct vport *ovs_netdev_link(struct vport *vport, const char *name)
78 {
79 int err;
80
81 vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name);
82 if (!vport->dev) {
83 err = -ENODEV;
84 goto error_free_vport;
85 }
86
87 if (vport->dev->flags & IFF_LOOPBACK ||
88 (vport->dev->type != ARPHRD_ETHER &&
89 vport->dev->type != ARPHRD_NONE) ||
90 ovs_is_internal_dev(vport->dev)) {
91 err = -EINVAL;
92 goto error_put;
93 }
94
95 rtnl_lock();
96 err = netdev_master_upper_dev_link(vport->dev,
97 get_dpdev(vport->dp),
98 NULL, NULL, NULL);
99 if (err)
100 goto error_unlock;
101
102 err = netdev_rx_handler_register(vport->dev, netdev_frame_hook,
103 vport);
104 if (err)
105 goto error_master_upper_dev_unlink;
106
107 dev_disable_lro(vport->dev);
108 dev_set_promiscuity(vport->dev, 1);
109 vport->dev->priv_flags |= IFF_OVS_DATAPATH;
110 rtnl_unlock();
111
112 return vport;
113
114 error_master_upper_dev_unlink:
115 netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp));
116 error_unlock:
117 rtnl_unlock();
118 error_put:
119 dev_put(vport->dev);
120 error_free_vport:
121 ovs_vport_free(vport);
122 return ERR_PTR(err);
123 }
124 EXPORT_SYMBOL_GPL(ovs_netdev_link);
125
126 static struct vport *netdev_create(const struct vport_parms *parms)
127 {
128 struct vport *vport;
129
130 vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms);
131 if (IS_ERR(vport))
132 return vport;
133
134 return ovs_netdev_link(vport, parms->name);
135 }
136
137 static void vport_netdev_free(struct rcu_head *rcu)
138 {
139 struct vport *vport = container_of(rcu, struct vport, rcu);
140
141 if (vport->dev)
142 dev_put(vport->dev);
143 ovs_vport_free(vport);
144 }
145
146 void ovs_netdev_detach_dev(struct vport *vport)
147 {
148 ASSERT_RTNL();
149 vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
150 netdev_rx_handler_unregister(vport->dev);
151 netdev_upper_dev_unlink(vport->dev,
152 netdev_master_upper_dev_get(vport->dev));
153 dev_set_promiscuity(vport->dev, -1);
154 }
155
156 static void netdev_destroy(struct vport *vport)
157 {
158 rtnl_lock();
159 if (vport->dev->priv_flags & IFF_OVS_DATAPATH)
160 ovs_netdev_detach_dev(vport);
161 rtnl_unlock();
162
163 call_rcu(&vport->rcu, vport_netdev_free);
164 }
165
166 void ovs_netdev_tunnel_destroy(struct vport *vport)
167 {
168 rtnl_lock();
169 if (vport->dev->priv_flags & IFF_OVS_DATAPATH)
170 ovs_netdev_detach_dev(vport);
171
172 /* We can be invoked by both explicit vport deletion and
173 * underlying netdev deregistration; delete the link only
174 * if it's not already shutting down.
175 */
176 if (vport->dev->reg_state == NETREG_REGISTERED)
177 rtnl_delete_link(vport->dev);
178 dev_put(vport->dev);
179 vport->dev = NULL;
180 rtnl_unlock();
181
182 call_rcu(&vport->rcu, vport_netdev_free);
183 }
184 EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy);
185
186 /* Returns null if this device is not attached to a datapath. */
187 struct vport *ovs_netdev_get_vport(struct net_device *dev)
188 {
189 if (likely(dev->priv_flags & IFF_OVS_DATAPATH))
190 return (struct vport *)
191 rcu_dereference_rtnl(dev->rx_handler_data);
192 else
193 return NULL;
194 }
195
196 static struct vport_ops ovs_netdev_vport_ops = {
197 .type = OVS_VPORT_TYPE_NETDEV,
198 .create = netdev_create,
199 .destroy = netdev_destroy,
200 .send = dev_queue_xmit,
201 };
202
203 int __init ovs_netdev_init(void)
204 {
205 return ovs_vport_ops_register(&ovs_netdev_vport_ops);
206 }
207
208 void ovs_netdev_exit(void)
209 {
210 ovs_vport_ops_unregister(&ovs_netdev_vport_ops);
211 }
212
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