Loading...
1/*
2 * Copyright (c) 2007-2012 Nicira, Inc.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
16 * 02110-1301, USA
17 */
18
19#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20
21#include <linux/if_arp.h>
22#include <linux/if_bridge.h>
23#include <linux/if_vlan.h>
24#include <linux/kernel.h>
25#include <linux/llc.h>
26#include <linux/rtnetlink.h>
27#include <linux/skbuff.h>
28#include <linux/openvswitch.h>
29#include <linux/export.h>
30
31#include <net/ip_tunnels.h>
32#include <net/rtnetlink.h>
33
34#include "datapath.h"
35#include "vport.h"
36#include "vport-internal_dev.h"
37#include "vport-netdev.h"
38
39static struct vport_ops ovs_netdev_vport_ops;
40
41/* Must be called with rcu_read_lock. */
42static void netdev_port_receive(struct sk_buff *skb)
43{
44 struct vport *vport;
45
46 vport = ovs_netdev_get_vport(skb->dev);
47 if (unlikely(!vport))
48 goto error;
49
50 if (unlikely(skb_warn_if_lro(skb)))
51 goto error;
52
53 /* Make our own copy of the packet. Otherwise we will mangle the
54 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
55 */
56 skb = skb_share_check(skb, GFP_ATOMIC);
57 if (unlikely(!skb))
58 return;
59
60 if (skb->dev->type == ARPHRD_ETHER) {
61 skb_push(skb, ETH_HLEN);
62 skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
63 }
64 ovs_vport_receive(vport, skb, skb_tunnel_info(skb));
65 return;
66error:
67 kfree_skb(skb);
68}
69
70/* Called with rcu_read_lock and bottom-halves disabled. */
71static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
72{
73 struct sk_buff *skb = *pskb;
74
75 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
76 return RX_HANDLER_PASS;
77
78 netdev_port_receive(skb);
79 return RX_HANDLER_CONSUMED;
80}
81
82static struct net_device *get_dpdev(const struct datapath *dp)
83{
84 struct vport *local;
85
86 local = ovs_vport_ovsl(dp, OVSP_LOCAL);
87 BUG_ON(!local);
88 return local->dev;
89}
90
91struct vport *ovs_netdev_link(struct vport *vport, const char *name)
92{
93 int err;
94
95 vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name);
96 if (!vport->dev) {
97 err = -ENODEV;
98 goto error_free_vport;
99 }
100
101 if (vport->dev->flags & IFF_LOOPBACK ||
102 (vport->dev->type != ARPHRD_ETHER &&
103 vport->dev->type != ARPHRD_NONE) ||
104 ovs_is_internal_dev(vport->dev)) {
105 err = -EINVAL;
106 goto error_put;
107 }
108
109 rtnl_lock();
110 err = netdev_master_upper_dev_link(vport->dev,
111 get_dpdev(vport->dp), NULL, NULL);
112 if (err)
113 goto error_unlock;
114
115 err = netdev_rx_handler_register(vport->dev, netdev_frame_hook,
116 vport);
117 if (err)
118 goto error_master_upper_dev_unlink;
119
120 dev_disable_lro(vport->dev);
121 dev_set_promiscuity(vport->dev, 1);
122 vport->dev->priv_flags |= IFF_OVS_DATAPATH;
123 rtnl_unlock();
124
125 return vport;
126
127error_master_upper_dev_unlink:
128 netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp));
129error_unlock:
130 rtnl_unlock();
131error_put:
132 dev_put(vport->dev);
133error_free_vport:
134 ovs_vport_free(vport);
135 return ERR_PTR(err);
136}
137EXPORT_SYMBOL_GPL(ovs_netdev_link);
138
139static struct vport *netdev_create(const struct vport_parms *parms)
140{
141 struct vport *vport;
142
143 vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms);
144 if (IS_ERR(vport))
145 return vport;
146
147 return ovs_netdev_link(vport, parms->name);
148}
149
150static void vport_netdev_free(struct rcu_head *rcu)
151{
152 struct vport *vport = container_of(rcu, struct vport, rcu);
153
154 if (vport->dev)
155 dev_put(vport->dev);
156 ovs_vport_free(vport);
157}
158
159void ovs_netdev_detach_dev(struct vport *vport)
160{
161 ASSERT_RTNL();
162 vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
163 netdev_rx_handler_unregister(vport->dev);
164 netdev_upper_dev_unlink(vport->dev,
165 netdev_master_upper_dev_get(vport->dev));
166 dev_set_promiscuity(vport->dev, -1);
167}
168
169static void netdev_destroy(struct vport *vport)
170{
171 rtnl_lock();
172 if (vport->dev->priv_flags & IFF_OVS_DATAPATH)
173 ovs_netdev_detach_dev(vport);
174 rtnl_unlock();
175
176 call_rcu(&vport->rcu, vport_netdev_free);
177}
178
179void ovs_netdev_tunnel_destroy(struct vport *vport)
180{
181 rtnl_lock();
182 if (vport->dev->priv_flags & IFF_OVS_DATAPATH)
183 ovs_netdev_detach_dev(vport);
184
185 /* We can be invoked by both explicit vport deletion and
186 * underlying netdev deregistration; delete the link only
187 * if it's not already shutting down.
188 */
189 if (vport->dev->reg_state == NETREG_REGISTERED)
190 rtnl_delete_link(vport->dev);
191 dev_put(vport->dev);
192 vport->dev = NULL;
193 rtnl_unlock();
194
195 call_rcu(&vport->rcu, vport_netdev_free);
196}
197EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy);
198
199/* Returns null if this device is not attached to a datapath. */
200struct vport *ovs_netdev_get_vport(struct net_device *dev)
201{
202 if (likely(dev->priv_flags & IFF_OVS_DATAPATH))
203 return (struct vport *)
204 rcu_dereference_rtnl(dev->rx_handler_data);
205 else
206 return NULL;
207}
208
209static struct vport_ops ovs_netdev_vport_ops = {
210 .type = OVS_VPORT_TYPE_NETDEV,
211 .create = netdev_create,
212 .destroy = netdev_destroy,
213 .send = dev_queue_xmit,
214};
215
216int __init ovs_netdev_init(void)
217{
218 return ovs_vport_ops_register(&ovs_netdev_vport_ops);
219}
220
221void ovs_netdev_exit(void)
222{
223 ovs_vport_ops_unregister(&ovs_netdev_vport_ops);
224}
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
76struct 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 /* Ensure that the device exists and that the provided
86 * name is not one of its aliases.
87 */
88 if (strcmp(name, ovs_vport_name(vport))) {
89 err = -ENODEV;
90 goto error_put;
91 }
92 netdev_tracker_alloc(vport->dev, &vport->dev_tracker, GFP_KERNEL);
93 if (vport->dev->flags & IFF_LOOPBACK ||
94 (vport->dev->type != ARPHRD_ETHER &&
95 vport->dev->type != ARPHRD_NONE) ||
96 ovs_is_internal_dev(vport->dev)) {
97 err = -EINVAL;
98 goto error_put;
99 }
100
101 rtnl_lock();
102 err = netdev_master_upper_dev_link(vport->dev,
103 get_dpdev(vport->dp),
104 NULL, NULL, NULL);
105 if (err)
106 goto error_unlock;
107
108 err = netdev_rx_handler_register(vport->dev, netdev_frame_hook,
109 vport);
110 if (err)
111 goto error_master_upper_dev_unlink;
112
113 dev_disable_lro(vport->dev);
114 dev_set_promiscuity(vport->dev, 1);
115 vport->dev->priv_flags |= IFF_OVS_DATAPATH;
116 rtnl_unlock();
117
118 return vport;
119
120error_master_upper_dev_unlink:
121 netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp));
122error_unlock:
123 rtnl_unlock();
124error_put:
125 netdev_put(vport->dev, &vport->dev_tracker);
126error_free_vport:
127 ovs_vport_free(vport);
128 return ERR_PTR(err);
129}
130EXPORT_SYMBOL_GPL(ovs_netdev_link);
131
132static struct vport *netdev_create(const struct vport_parms *parms)
133{
134 struct vport *vport;
135
136 vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms);
137 if (IS_ERR(vport))
138 return vport;
139
140 return ovs_netdev_link(vport, parms->name);
141}
142
143static void vport_netdev_free(struct rcu_head *rcu)
144{
145 struct vport *vport = container_of(rcu, struct vport, rcu);
146
147 netdev_put(vport->dev, &vport->dev_tracker);
148 ovs_vport_free(vport);
149}
150
151void ovs_netdev_detach_dev(struct vport *vport)
152{
153 ASSERT_RTNL();
154 vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
155 netdev_rx_handler_unregister(vport->dev);
156 netdev_upper_dev_unlink(vport->dev,
157 netdev_master_upper_dev_get(vport->dev));
158 dev_set_promiscuity(vport->dev, -1);
159}
160
161static void netdev_destroy(struct vport *vport)
162{
163 rtnl_lock();
164 if (netif_is_ovs_port(vport->dev))
165 ovs_netdev_detach_dev(vport);
166 rtnl_unlock();
167
168 call_rcu(&vport->rcu, vport_netdev_free);
169}
170
171void ovs_netdev_tunnel_destroy(struct vport *vport)
172{
173 rtnl_lock();
174 if (netif_is_ovs_port(vport->dev))
175 ovs_netdev_detach_dev(vport);
176
177 /* We can be invoked by both explicit vport deletion and
178 * underlying netdev deregistration; delete the link only
179 * if it's not already shutting down.
180 */
181 if (vport->dev->reg_state == NETREG_REGISTERED)
182 rtnl_delete_link(vport->dev, 0, NULL);
183 netdev_put(vport->dev, &vport->dev_tracker);
184 vport->dev = NULL;
185 rtnl_unlock();
186
187 call_rcu(&vport->rcu, vport_netdev_free);
188}
189EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy);
190
191/* Returns null if this device is not attached to a datapath. */
192struct vport *ovs_netdev_get_vport(struct net_device *dev)
193{
194 if (likely(netif_is_ovs_port(dev)))
195 return (struct vport *)
196 rcu_dereference_rtnl(dev->rx_handler_data);
197 else
198 return NULL;
199}
200
201static struct vport_ops ovs_netdev_vport_ops = {
202 .type = OVS_VPORT_TYPE_NETDEV,
203 .create = netdev_create,
204 .destroy = netdev_destroy,
205 .send = dev_queue_xmit,
206};
207
208int __init ovs_netdev_init(void)
209{
210 return ovs_vport_ops_register(&ovs_netdev_vport_ops);
211}
212
213void ovs_netdev_exit(void)
214{
215 ovs_vport_ops_unregister(&ovs_netdev_vport_ops);
216}