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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};
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};