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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/*
2 * Copyright (c) 2007-2011 Nicira Networks.
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
29#include <net/llc.h>
30
31#include "datapath.h"
32#include "vport-internal_dev.h"
33#include "vport-netdev.h"
34
35/* Must be called with rcu_read_lock. */
36static void netdev_port_receive(struct vport *vport, struct sk_buff *skb)
37{
38 if (unlikely(!vport)) {
39 kfree_skb(skb);
40 return;
41 }
42
43 /* Make our own copy of the packet. Otherwise we will mangle the
44 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
45 * (No one comes after us, since we tell handle_bridge() that we took
46 * the packet.) */
47 skb = skb_share_check(skb, GFP_ATOMIC);
48 if (unlikely(!skb))
49 return;
50
51 skb_push(skb, ETH_HLEN);
52 ovs_vport_receive(vport, skb);
53}
54
55/* Called with rcu_read_lock and bottom-halves disabled. */
56static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
57{
58 struct sk_buff *skb = *pskb;
59 struct vport *vport;
60
61 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
62 return RX_HANDLER_PASS;
63
64 vport = ovs_netdev_get_vport(skb->dev);
65
66 netdev_port_receive(vport, skb);
67
68 return RX_HANDLER_CONSUMED;
69}
70
71static struct vport *netdev_create(const struct vport_parms *parms)
72{
73 struct vport *vport;
74 struct netdev_vport *netdev_vport;
75 int err;
76
77 vport = ovs_vport_alloc(sizeof(struct netdev_vport),
78 &ovs_netdev_vport_ops, parms);
79 if (IS_ERR(vport)) {
80 err = PTR_ERR(vport);
81 goto error;
82 }
83
84 netdev_vport = netdev_vport_priv(vport);
85
86 netdev_vport->dev = dev_get_by_name(&init_net, parms->name);
87 if (!netdev_vport->dev) {
88 err = -ENODEV;
89 goto error_free_vport;
90 }
91
92 if (netdev_vport->dev->flags & IFF_LOOPBACK ||
93 netdev_vport->dev->type != ARPHRD_ETHER ||
94 ovs_is_internal_dev(netdev_vport->dev)) {
95 err = -EINVAL;
96 goto error_put;
97 }
98
99 err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook,
100 vport);
101 if (err)
102 goto error_put;
103
104 dev_set_promiscuity(netdev_vport->dev, 1);
105 netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH;
106
107 return vport;
108
109error_put:
110 dev_put(netdev_vport->dev);
111error_free_vport:
112 ovs_vport_free(vport);
113error:
114 return ERR_PTR(err);
115}
116
117static void netdev_destroy(struct vport *vport)
118{
119 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
120
121 netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
122 netdev_rx_handler_unregister(netdev_vport->dev);
123 dev_set_promiscuity(netdev_vport->dev, -1);
124
125 synchronize_rcu();
126
127 dev_put(netdev_vport->dev);
128 ovs_vport_free(vport);
129}
130
131const char *ovs_netdev_get_name(const struct vport *vport)
132{
133 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
134 return netdev_vport->dev->name;
135}
136
137int ovs_netdev_get_ifindex(const struct vport *vport)
138{
139 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
140 return netdev_vport->dev->ifindex;
141}
142
143static unsigned int packet_length(const struct sk_buff *skb)
144{
145 unsigned int length = skb->len - ETH_HLEN;
146
147 if (skb->protocol == htons(ETH_P_8021Q))
148 length -= VLAN_HLEN;
149
150 return length;
151}
152
153static int netdev_send(struct vport *vport, struct sk_buff *skb)
154{
155 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
156 int mtu = netdev_vport->dev->mtu;
157 int len;
158
159 if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) {
160 net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
161 ovs_dp_name(vport->dp),
162 packet_length(skb), mtu);
163 goto error;
164 }
165
166 if (unlikely(skb_warn_if_lro(skb)))
167 goto error;
168
169 skb->dev = netdev_vport->dev;
170 len = skb->len;
171 dev_queue_xmit(skb);
172
173 return len;
174
175error:
176 kfree_skb(skb);
177 ovs_vport_record_error(vport, VPORT_E_TX_DROPPED);
178 return 0;
179}
180
181/* Returns null if this device is not attached to a datapath. */
182struct vport *ovs_netdev_get_vport(struct net_device *dev)
183{
184 if (likely(dev->priv_flags & IFF_OVS_DATAPATH))
185 return (struct vport *)
186 rcu_dereference_rtnl(dev->rx_handler_data);
187 else
188 return NULL;
189}
190
191const struct vport_ops ovs_netdev_vport_ops = {
192 .type = OVS_VPORT_TYPE_NETDEV,
193 .create = netdev_create,
194 .destroy = netdev_destroy,
195 .get_name = ovs_netdev_get_name,
196 .get_ifindex = ovs_netdev_get_ifindex,
197 .send = netdev_send,
198};