blob: 670cbc3518ded5930f900eaca7e0677835cf750b [file] [log] [blame]
Jesse Grossccb13522011-10-25 19:26:31 -07001/*
Raju Subramaniancaf2ee12012-05-03 18:55:23 -07002 * Copyright (c) 2007-2012 Nicira, Inc.
Jesse Grossccb13522011-10-25 19:26:31 -07003 *
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{
Jesse Grossd9d59082013-01-21 23:57:26 -080038 if (unlikely(!vport))
39 goto error;
40
41 if (unlikely(skb_warn_if_lro(skb)))
42 goto error;
Jesse Grossccb13522011-10-25 19:26:31 -070043
44 /* Make our own copy of the packet. Otherwise we will mangle the
45 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
46 * (No one comes after us, since we tell handle_bridge() that we took
47 * the packet.) */
48 skb = skb_share_check(skb, GFP_ATOMIC);
49 if (unlikely(!skb))
50 return;
51
52 skb_push(skb, ETH_HLEN);
53 ovs_vport_receive(vport, skb);
Jesse Grossd9d59082013-01-21 23:57:26 -080054 return;
55
56error:
57 kfree_skb(skb);
Jesse Grossccb13522011-10-25 19:26:31 -070058}
59
60/* Called with rcu_read_lock and bottom-halves disabled. */
61static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
62{
63 struct sk_buff *skb = *pskb;
64 struct vport *vport;
65
66 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
67 return RX_HANDLER_PASS;
68
69 vport = ovs_netdev_get_vport(skb->dev);
70
71 netdev_port_receive(vport, skb);
72
73 return RX_HANDLER_CONSUMED;
74}
75
76static struct vport *netdev_create(const struct vport_parms *parms)
77{
78 struct vport *vport;
79 struct netdev_vport *netdev_vport;
80 int err;
81
82 vport = ovs_vport_alloc(sizeof(struct netdev_vport),
83 &ovs_netdev_vport_ops, parms);
84 if (IS_ERR(vport)) {
85 err = PTR_ERR(vport);
86 goto error;
87 }
88
89 netdev_vport = netdev_vport_priv(vport);
90
Pravin B Shelar46df7b82012-02-22 19:58:59 -080091 netdev_vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), parms->name);
Jesse Grossccb13522011-10-25 19:26:31 -070092 if (!netdev_vport->dev) {
93 err = -ENODEV;
94 goto error_free_vport;
95 }
96
97 if (netdev_vport->dev->flags & IFF_LOOPBACK ||
98 netdev_vport->dev->type != ARPHRD_ETHER ||
99 ovs_is_internal_dev(netdev_vport->dev)) {
100 err = -EINVAL;
101 goto error_put;
102 }
103
104 err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook,
105 vport);
106 if (err)
107 goto error_put;
108
109 dev_set_promiscuity(netdev_vport->dev, 1);
110 netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH;
111
112 return vport;
113
114error_put:
115 dev_put(netdev_vport->dev);
116error_free_vport:
117 ovs_vport_free(vport);
118error:
119 return ERR_PTR(err);
120}
121
Jesse Gross92eb1d42012-11-28 14:01:52 -0800122static void free_port_rcu(struct rcu_head *rcu)
123{
124 struct netdev_vport *netdev_vport = container_of(rcu,
125 struct netdev_vport, rcu);
126
127 dev_put(netdev_vport->dev);
128 ovs_vport_free(vport_from_priv(netdev_vport));
129}
130
Jesse Grossccb13522011-10-25 19:26:31 -0700131static void netdev_destroy(struct vport *vport)
132{
133 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
134
135 netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
136 netdev_rx_handler_unregister(netdev_vport->dev);
137 dev_set_promiscuity(netdev_vport->dev, -1);
138
Jesse Gross92eb1d42012-11-28 14:01:52 -0800139 call_rcu(&netdev_vport->rcu, free_port_rcu);
Jesse Grossccb13522011-10-25 19:26:31 -0700140}
141
142const char *ovs_netdev_get_name(const struct vport *vport)
143{
144 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
145 return netdev_vport->dev->name;
146}
147
148int ovs_netdev_get_ifindex(const struct vport *vport)
149{
150 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
151 return netdev_vport->dev->ifindex;
152}
153
Eric Dumazet95c96172012-04-15 05:58:06 +0000154static unsigned int packet_length(const struct sk_buff *skb)
Jesse Grossccb13522011-10-25 19:26:31 -0700155{
Eric Dumazet95c96172012-04-15 05:58:06 +0000156 unsigned int length = skb->len - ETH_HLEN;
Jesse Grossccb13522011-10-25 19:26:31 -0700157
158 if (skb->protocol == htons(ETH_P_8021Q))
159 length -= VLAN_HLEN;
160
161 return length;
162}
163
164static int netdev_send(struct vport *vport, struct sk_buff *skb)
165{
166 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
167 int mtu = netdev_vport->dev->mtu;
168 int len;
169
170 if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) {
Joe Perchese87cc472012-05-13 21:56:26 +0000171 net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
Jesse Grossc1c92b62012-10-30 15:48:48 -0700172 netdev_vport->dev->name,
Joe Perchese87cc472012-05-13 21:56:26 +0000173 packet_length(skb), mtu);
Jesse Grossccb13522011-10-25 19:26:31 -0700174 goto error;
175 }
176
Jesse Grossccb13522011-10-25 19:26:31 -0700177 skb->dev = netdev_vport->dev;
178 len = skb->len;
179 dev_queue_xmit(skb);
180
181 return len;
182
183error:
184 kfree_skb(skb);
185 ovs_vport_record_error(vport, VPORT_E_TX_DROPPED);
186 return 0;
187}
188
189/* Returns null if this device is not attached to a datapath. */
190struct vport *ovs_netdev_get_vport(struct net_device *dev)
191{
192 if (likely(dev->priv_flags & IFF_OVS_DATAPATH))
193 return (struct vport *)
194 rcu_dereference_rtnl(dev->rx_handler_data);
195 else
196 return NULL;
197}
198
199const struct vport_ops ovs_netdev_vport_ops = {
200 .type = OVS_VPORT_TYPE_NETDEV,
201 .create = netdev_create,
202 .destroy = netdev_destroy,
203 .get_name = ovs_netdev_get_name,
204 .get_ifindex = ovs_netdev_get_ifindex,
205 .send = netdev_send,
206};