tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 return local->dev;
88}
89
90struct vport *ovs_netdev_link(struct vport *vport, const char *name)
91{
92 int err;
93
94 vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name);
95 if (!vport->dev) {
96 err = -ENODEV;
97 goto error_free_vport;
98 }
99
100 if (vport->dev->flags & IFF_LOOPBACK ||
101 (vport->dev->type != ARPHRD_ETHER &&
102 vport->dev->type != ARPHRD_NONE) ||
103 ovs_is_internal_dev(vport->dev)) {
104 err = -EINVAL;
105 goto error_put;
106 }
107
108 rtnl_lock();
109 err = netdev_master_upper_dev_link(vport->dev,
110 get_dpdev(vport->dp),
111 NULL, 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}