2 * Copyright (c) 2007-2012 Nicira, Inc.
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.
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.
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
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
33 #include "vport-internal_dev.h"
34 #include "vport-netdev.h"
36 static struct vport_ops ovs_netdev_vport_ops;
38 /* Must be called with rcu_read_lock. */
39 static void netdev_port_receive(struct vport *vport, struct sk_buff *skb)
44 if (unlikely(skb_warn_if_lro(skb)))
47 /* Make our own copy of the packet. Otherwise we will mangle the
48 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
50 skb = skb_share_check(skb, GFP_ATOMIC);
54 skb_push(skb, ETH_HLEN);
55 ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
57 ovs_vport_receive(vport, skb, NULL);
64 /* Called with rcu_read_lock and bottom-halves disabled. */
65 static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
67 struct sk_buff *skb = *pskb;
70 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
71 return RX_HANDLER_PASS;
73 vport = ovs_netdev_get_vport(skb->dev);
75 netdev_port_receive(vport, skb);
77 return RX_HANDLER_CONSUMED;
80 static struct net_device *get_dpdev(const struct datapath *dp)
84 local = ovs_vport_ovsl(dp, OVSP_LOCAL);
89 static struct vport *netdev_link(struct vport *vport, const char *name)
93 vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name);
96 goto error_free_vport;
99 if (vport->dev->flags & IFF_LOOPBACK ||
100 vport->dev->type != ARPHRD_ETHER ||
101 ovs_is_internal_dev(vport->dev)) {
107 err = netdev_master_upper_dev_link(vport->dev,
108 get_dpdev(vport->dp));
112 err = netdev_rx_handler_register(vport->dev, netdev_frame_hook,
115 goto error_master_upper_dev_unlink;
117 dev_disable_lro(vport->dev);
118 dev_set_promiscuity(vport->dev, 1);
119 vport->dev->priv_flags |= IFF_OVS_DATAPATH;
124 error_master_upper_dev_unlink:
125 netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp));
131 ovs_vport_free(vport);
135 static struct vport *netdev_create(const struct vport_parms *parms)
139 vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms);
143 return netdev_link(vport, parms->name);
146 static void free_port_rcu(struct rcu_head *rcu)
148 struct vport *vport = container_of(rcu, struct vport, rcu);
151 ovs_vport_free(vport);
154 void ovs_netdev_detach_dev(struct vport *vport)
157 vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
158 netdev_rx_handler_unregister(vport->dev);
159 netdev_upper_dev_unlink(vport->dev,
160 netdev_master_upper_dev_get(vport->dev));
161 dev_set_promiscuity(vport->dev, -1);
164 static void netdev_destroy(struct vport *vport)
167 if (vport->dev->priv_flags & IFF_OVS_DATAPATH)
168 ovs_netdev_detach_dev(vport);
171 call_rcu(&vport->rcu, free_port_rcu);
174 static unsigned int packet_length(const struct sk_buff *skb)
176 unsigned int length = skb->len - ETH_HLEN;
178 if (skb->protocol == htons(ETH_P_8021Q))
184 static int netdev_send(struct vport *vport, struct sk_buff *skb)
186 int mtu = vport->dev->mtu;
189 if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) {
190 net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
192 packet_length(skb), mtu);
196 skb->dev = vport->dev;
207 /* Returns null if this device is not attached to a datapath. */
208 struct vport *ovs_netdev_get_vport(struct net_device *dev)
210 if (likely(dev->priv_flags & IFF_OVS_DATAPATH))
211 return (struct vport *)
212 rcu_dereference_rtnl(dev->rx_handler_data);
217 static struct vport_ops ovs_netdev_vport_ops = {
218 .type = OVS_VPORT_TYPE_NETDEV,
219 .create = netdev_create,
220 .destroy = netdev_destroy,
224 int __init ovs_netdev_init(void)
226 return ovs_vport_ops_register(&ovs_netdev_vport_ops);
229 void ovs_netdev_exit(void)
231 ovs_vport_ops_unregister(&ovs_netdev_vport_ops);