2 * Copyright (c) 2007-2015 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>
30 #include <net/ip_tunnels.h>
31 #include <net/rtnetlink.h>
36 #include "vport-internal_dev.h"
37 #include "vport-netdev.h"
39 static struct vport_ops ovs_netdev_vport_ops;
41 /* Must be called with rcu_read_lock. */
42 void netdev_port_receive(struct sk_buff *skb, struct ip_tunnel_info *tun_info)
46 vport = ovs_netdev_get_vport(skb->dev);
50 if (unlikely(skb_warn_if_lro(skb)))
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).
56 skb = skb_share_check(skb, GFP_ATOMIC);
60 skb_push(skb, ETH_HLEN);
61 ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
62 ovs_vport_receive(vport, skb, tun_info);
68 #ifndef HAVE_METADATA_DST
69 #define port_receive(skb) netdev_port_receive(skb, NULL)
71 #define port_receive(skb) netdev_port_receive(skb, skb_tunnel_info(skb))
74 #if defined HAVE_RX_HANDLER_PSKB /* 2.6.39 and above or backports */
75 /* Called with rcu_read_lock and bottom-halves disabled. */
76 static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
78 struct sk_buff *skb = *pskb;
80 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
81 return RX_HANDLER_PASS;
84 return RX_HANDLER_CONSUMED;
86 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36) || \
87 defined HAVE_RHEL_OVS_HOOK
88 /* Called with rcu_read_lock and bottom-halves disabled. */
89 static struct sk_buff *netdev_frame_hook(struct sk_buff *skb)
91 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
97 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,32)
99 * Used as br_handle_frame_hook. (Cannot run bridge at the same time, even on
100 * different set of devices!)
102 /* Called with rcu_read_lock and bottom-halves disabled. */
103 static struct sk_buff *netdev_frame_hook(struct net_bridge_port *p,
113 static struct net_device *get_dpdev(const struct datapath *dp)
117 local = ovs_vport_ovsl(dp, OVSP_LOCAL);
122 struct vport *ovs_netdev_link(struct vport *vport, const char *name)
126 vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name);
129 goto error_free_vport;
132 if (vport->dev->flags & IFF_LOOPBACK ||
133 vport->dev->type != ARPHRD_ETHER ||
134 ovs_is_internal_dev(vport->dev)) {
140 err = netdev_master_upper_dev_link(vport->dev,
141 get_dpdev(vport->dp));
145 err = netdev_rx_handler_register(vport->dev, netdev_frame_hook,
148 goto error_master_upper_dev_unlink;
150 dev_disable_lro(vport->dev);
151 dev_set_promiscuity(vport->dev, 1);
152 vport->dev->priv_flags |= IFF_OVS_DATAPATH;
157 error_master_upper_dev_unlink:
158 netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp));
164 ovs_vport_free(vport);
167 EXPORT_SYMBOL_GPL(ovs_netdev_link);
169 static struct vport *netdev_create(const struct vport_parms *parms)
173 vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms);
177 return ovs_netdev_link(vport, parms->name);
180 static void vport_netdev_free(struct rcu_head *rcu)
182 struct vport *vport = container_of(rcu, struct vport, rcu);
186 ovs_vport_free(vport);
189 void ovs_netdev_detach_dev(struct vport *vport)
192 vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
193 netdev_rx_handler_unregister(vport->dev);
194 netdev_upper_dev_unlink(vport->dev,
195 netdev_master_upper_dev_get(vport->dev));
196 dev_set_promiscuity(vport->dev, -1);
198 EXPORT_SYMBOL_GPL(ovs_netdev_detach_dev);
200 static void netdev_destroy(struct vport *vport)
203 if (vport->dev->priv_flags & IFF_OVS_DATAPATH)
204 ovs_netdev_detach_dev(vport);
207 call_rcu(&vport->rcu, vport_netdev_free);
210 void ovs_netdev_tunnel_destroy(struct vport *vport)
213 if (vport->dev->priv_flags & IFF_OVS_DATAPATH)
214 ovs_netdev_detach_dev(vport);
216 /* We can be invoked by both explicit vport deletion and
217 * underlying netdev deregistration; delete the link only
218 * if it's not already shutting down.
221 if (vport->dev->reg_state == NETREG_REGISTERED)
222 rtnl_delete_link(vport->dev);
228 call_rcu(&vport->rcu, vport_netdev_free);
230 EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy);
232 /* Returns null if this device is not attached to a datapath. */
233 struct vport *ovs_netdev_get_vport(struct net_device *dev)
235 #if defined HAVE_NETDEV_RX_HANDLER_REGISTER || \
236 defined HAVE_RHEL_OVS_HOOK
237 #ifdef HAVE_OVS_DATAPATH
238 if (likely(dev->priv_flags & IFF_OVS_DATAPATH))
240 if (likely(rcu_access_pointer(dev->rx_handler) == netdev_frame_hook))
242 #ifdef HAVE_RHEL_OVS_HOOK
243 return (struct vport *)rcu_dereference_rtnl(dev->ax25_ptr);
245 #ifdef HAVE_NET_DEVICE_EXTENDED
246 return (struct vport *)
247 rcu_dereference_rtnl(netdev_extended(dev)->rx_handler_data);
249 return (struct vport *)rcu_dereference_rtnl(dev->rx_handler_data);
255 return (struct vport *)rcu_dereference_rtnl(dev->br_port);
259 static struct vport_ops ovs_netdev_vport_ops = {
260 .type = OVS_VPORT_TYPE_NETDEV,
261 .create = netdev_create,
262 .destroy = netdev_destroy,
263 .send = dev_queue_xmit,
266 int __init ovs_netdev_init(void)
268 return ovs_vport_ops_register(&ovs_netdev_vport_ops);
271 void ovs_netdev_exit(void)
273 ovs_vport_ops_unregister(&ovs_netdev_vport_ops);
276 #if !defined HAVE_NETDEV_RX_HANDLER_REGISTER && \
277 !defined HAVE_RHEL_OVS_HOOK
279 * Enforces, mutual exclusion with the Linux bridge module, by declaring and
280 * exporting br_should_route_hook. Because the bridge module also exports the
281 * same symbol, the module loader will refuse to load both modules at the same
282 * time (e.g. "bridge: exports duplicate symbol br_should_route_hook (owned by
285 * Before Linux 2.6.36, Open vSwitch cannot safely coexist with the Linux
286 * bridge module, so openvswitch uses this macro in those versions. In
287 * Linux 2.6.36 and later, Open vSwitch can coexist with the bridge module.
289 * The use of "typeof" here avoids the need to track changes in the type of
290 * br_should_route_hook over various kernel versions.
292 typeof(br_should_route_hook) br_should_route_hook;
293 EXPORT_SYMBOL(br_should_route_hook);