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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
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
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
113error_master_upper_dev_unlink:
114 netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp));
115error_unlock:
116 rtnl_unlock();
117error_put:
118 dev_put(vport->dev);
119error_free_vport:
120 ovs_vport_free(vport);
121 return ERR_PTR(err);
122}
123EXPORT_SYMBOL_GPL(ovs_netdev_link);
124
125static 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
136static 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
145void 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
155static 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
165void 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}
183EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy);
184
185/* Returns null if this device is not attached to a datapath. */
186struct 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
195static 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
202int __init ovs_netdev_init(void)
203{
204 return ovs_vport_ops_register(&ovs_netdev_vport_ops);
205}
206
207void ovs_netdev_exit(void)
208{
209 ovs_vport_ops_unregister(&ovs_netdev_vport_ops);
210}
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
30#include <net/llc.h>
31
32#include "datapath.h"
33#include "vport-internal_dev.h"
34#include "vport-netdev.h"
35
36/* Must be called with rcu_read_lock. */
37static void netdev_port_receive(struct vport *vport, struct sk_buff *skb)
38{
39 if (unlikely(!vport))
40 goto error;
41
42 if (unlikely(skb_warn_if_lro(skb)))
43 goto error;
44
45 /* Make our own copy of the packet. Otherwise we will mangle the
46 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
47 */
48 skb = skb_share_check(skb, GFP_ATOMIC);
49 if (unlikely(!skb))
50 return;
51
52 skb_push(skb, ETH_HLEN);
53 ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
54
55 ovs_vport_receive(vport, skb, NULL);
56 return;
57
58error:
59 kfree_skb(skb);
60}
61
62/* Called with rcu_read_lock and bottom-halves disabled. */
63static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
64{
65 struct sk_buff *skb = *pskb;
66 struct vport *vport;
67
68 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
69 return RX_HANDLER_PASS;
70
71 vport = ovs_netdev_get_vport(skb->dev);
72
73 netdev_port_receive(vport, skb);
74
75 return RX_HANDLER_CONSUMED;
76}
77
78static struct net_device *get_dpdev(struct datapath *dp)
79{
80 struct vport *local;
81
82 local = ovs_vport_ovsl(dp, OVSP_LOCAL);
83 BUG_ON(!local);
84 return netdev_vport_priv(local)->dev;
85}
86
87static struct vport *netdev_create(const struct vport_parms *parms)
88{
89 struct vport *vport;
90 struct netdev_vport *netdev_vport;
91 int err;
92
93 vport = ovs_vport_alloc(sizeof(struct netdev_vport),
94 &ovs_netdev_vport_ops, parms);
95 if (IS_ERR(vport)) {
96 err = PTR_ERR(vport);
97 goto error;
98 }
99
100 netdev_vport = netdev_vport_priv(vport);
101
102 netdev_vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), parms->name);
103 if (!netdev_vport->dev) {
104 err = -ENODEV;
105 goto error_free_vport;
106 }
107
108 if (netdev_vport->dev->flags & IFF_LOOPBACK ||
109 netdev_vport->dev->type != ARPHRD_ETHER ||
110 ovs_is_internal_dev(netdev_vport->dev)) {
111 err = -EINVAL;
112 goto error_put;
113 }
114
115 rtnl_lock();
116 err = netdev_master_upper_dev_link(netdev_vport->dev,
117 get_dpdev(vport->dp));
118 if (err)
119 goto error_unlock;
120
121 err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook,
122 vport);
123 if (err)
124 goto error_master_upper_dev_unlink;
125
126 dev_set_promiscuity(netdev_vport->dev, 1);
127 netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH;
128 rtnl_unlock();
129
130 return vport;
131
132error_master_upper_dev_unlink:
133 netdev_upper_dev_unlink(netdev_vport->dev, get_dpdev(vport->dp));
134error_unlock:
135 rtnl_unlock();
136error_put:
137 dev_put(netdev_vport->dev);
138error_free_vport:
139 ovs_vport_free(vport);
140error:
141 return ERR_PTR(err);
142}
143
144static void free_port_rcu(struct rcu_head *rcu)
145{
146 struct netdev_vport *netdev_vport = container_of(rcu,
147 struct netdev_vport, rcu);
148
149 dev_put(netdev_vport->dev);
150 ovs_vport_free(vport_from_priv(netdev_vport));
151}
152
153void ovs_netdev_detach_dev(struct vport *vport)
154{
155 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
156
157 ASSERT_RTNL();
158 netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
159 netdev_rx_handler_unregister(netdev_vport->dev);
160 netdev_upper_dev_unlink(netdev_vport->dev,
161 netdev_master_upper_dev_get(netdev_vport->dev));
162 dev_set_promiscuity(netdev_vport->dev, -1);
163}
164
165static void netdev_destroy(struct vport *vport)
166{
167 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
168
169 rtnl_lock();
170 if (netdev_vport->dev->priv_flags & IFF_OVS_DATAPATH)
171 ovs_netdev_detach_dev(vport);
172 rtnl_unlock();
173
174 call_rcu(&netdev_vport->rcu, free_port_rcu);
175}
176
177const char *ovs_netdev_get_name(const struct vport *vport)
178{
179 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
180 return netdev_vport->dev->name;
181}
182
183static unsigned int packet_length(const struct sk_buff *skb)
184{
185 unsigned int length = skb->len - ETH_HLEN;
186
187 if (skb->protocol == htons(ETH_P_8021Q))
188 length -= VLAN_HLEN;
189
190 return length;
191}
192
193static int netdev_send(struct vport *vport, struct sk_buff *skb)
194{
195 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
196 int mtu = netdev_vport->dev->mtu;
197 int len;
198
199 if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) {
200 net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
201 netdev_vport->dev->name,
202 packet_length(skb), mtu);
203 goto drop;
204 }
205
206 skb->dev = netdev_vport->dev;
207 len = skb->len;
208 dev_queue_xmit(skb);
209
210 return len;
211
212drop:
213 kfree_skb(skb);
214 return 0;
215}
216
217/* Returns null if this device is not attached to a datapath. */
218struct vport *ovs_netdev_get_vport(struct net_device *dev)
219{
220 if (likely(dev->priv_flags & IFF_OVS_DATAPATH))
221 return (struct vport *)
222 rcu_dereference_rtnl(dev->rx_handler_data);
223 else
224 return NULL;
225}
226
227const struct vport_ops ovs_netdev_vport_ops = {
228 .type = OVS_VPORT_TYPE_NETDEV,
229 .create = netdev_create,
230 .destroy = netdev_destroy,
231 .get_name = ovs_netdev_get_name,
232 .send = netdev_send,
233};