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