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 /* Must be called with rcu_read_lock. */
37 static void netdev_port_receive(struct vport *vport, struct sk_buff *skb)
42 if (unlikely(skb_warn_if_lro(skb)))
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).
48 skb = skb_share_check(skb, GFP_ATOMIC);
52 skb_push(skb, ETH_HLEN);
53 ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
55 ovs_vport_receive(vport, skb, NULL);
62 /* Called with rcu_read_lock and bottom-halves disabled. */
63 static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
65 struct sk_buff *skb = *pskb;
68 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
69 return RX_HANDLER_PASS;
71 vport = ovs_netdev_get_vport(skb->dev);
73 netdev_port_receive(vport, skb);
75 return RX_HANDLER_CONSUMED;
78 static struct net_device *get_dpdev(struct datapath *dp)
82 local = ovs_vport_ovsl(dp, OVSP_LOCAL);
84 return netdev_vport_priv(local)->dev;
87 static struct vport *netdev_create(const struct vport_parms *parms)
90 struct netdev_vport *netdev_vport;
93 vport = ovs_vport_alloc(sizeof(struct netdev_vport),
94 &ovs_netdev_vport_ops, parms);
100 netdev_vport = netdev_vport_priv(vport);
102 netdev_vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), parms->name);
103 if (!netdev_vport->dev) {
105 goto error_free_vport;
108 if (netdev_vport->dev->flags & IFF_LOOPBACK ||
109 netdev_vport->dev->type != ARPHRD_ETHER ||
110 ovs_is_internal_dev(netdev_vport->dev)) {
116 err = netdev_master_upper_dev_link(netdev_vport->dev,
117 get_dpdev(vport->dp));
121 err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook,
124 goto error_master_upper_dev_unlink;
126 dev_set_promiscuity(netdev_vport->dev, 1);
127 netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH;
132 error_master_upper_dev_unlink:
133 netdev_upper_dev_unlink(netdev_vport->dev, get_dpdev(vport->dp));
137 dev_put(netdev_vport->dev);
139 ovs_vport_free(vport);
144 static void free_port_rcu(struct rcu_head *rcu)
146 struct netdev_vport *netdev_vport = container_of(rcu,
147 struct netdev_vport, rcu);
149 dev_put(netdev_vport->dev);
150 ovs_vport_free(vport_from_priv(netdev_vport));
153 static void netdev_destroy(struct vport *vport)
155 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
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, get_dpdev(vport->dp));
161 dev_set_promiscuity(netdev_vport->dev, -1);
164 call_rcu(&netdev_vport->rcu, free_port_rcu);
167 const char *ovs_netdev_get_name(const struct vport *vport)
169 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
170 return netdev_vport->dev->name;
173 static unsigned int packet_length(const struct sk_buff *skb)
175 unsigned int length = skb->len - ETH_HLEN;
177 if (skb->protocol == htons(ETH_P_8021Q))
183 static int netdev_send(struct vport *vport, struct sk_buff *skb)
185 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
186 int mtu = netdev_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",
191 netdev_vport->dev->name,
192 packet_length(skb), mtu);
196 skb->dev = netdev_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 const struct vport_ops ovs_netdev_vport_ops = {
218 .type = OVS_VPORT_TYPE_NETDEV,
219 .create = netdev_create,
220 .destroy = netdev_destroy,
221 .get_name = ovs_netdev_get_name,