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>
29 #include <linux/export.h>
31 #include <net/ip_tunnels.h>
32 #include <net/rtnetlink.h>
37 #include "vport-internal_dev.h"
38 #include "vport-netdev.h"
40 static struct vport_ops ovs_netdev_vport_ops
;
42 /* Must be called with rcu_read_lock. */
43 void netdev_port_receive(struct sk_buff
*skb
, struct ip_tunnel_info
*tun_info
)
47 vport
= ovs_netdev_get_vport(skb
->dev
);
51 if (unlikely(skb_warn_if_lro(skb
)))
54 /* Make our own copy of the packet. Otherwise we will mangle the
55 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
57 skb
= skb_share_check(skb
, GFP_ATOMIC
);
61 if (skb
->dev
->type
== ARPHRD_ETHER
) {
62 skb_push(skb
, ETH_HLEN
);
63 skb_postpush_rcsum(skb
, skb
->data
, ETH_HLEN
);
65 ovs_vport_receive(vport
, skb
, tun_info
);
71 /* Called with rcu_read_lock and bottom-halves disabled. */
72 static rx_handler_result_t
netdev_frame_hook(struct sk_buff
**pskb
)
74 struct sk_buff
*skb
= *pskb
;
76 if (unlikely(skb
->pkt_type
== PACKET_LOOPBACK
))
77 return RX_HANDLER_PASS
;
79 #ifndef USE_UPSTREAM_TUNNEL
80 netdev_port_receive(skb
, NULL
);
82 netdev_port_receive(skb
, skb_tunnel_info(skb
));
84 return RX_HANDLER_CONSUMED
;
87 static struct net_device
*get_dpdev(const struct datapath
*dp
)
91 local
= ovs_vport_ovsl(dp
, OVSP_LOCAL
);
96 struct vport
*ovs_netdev_link(struct vport
*vport
, const char *name
)
100 vport
->dev
= dev_get_by_name(ovs_dp_get_net(vport
->dp
), name
);
103 goto error_free_vport
;
106 if (vport
->dev
->flags
& IFF_LOOPBACK
||
107 (vport
->dev
->type
!= ARPHRD_ETHER
&&
108 vport
->dev
->type
!= ARPHRD_NONE
) ||
109 ovs_is_internal_dev(vport
->dev
)) {
115 err
= netdev_master_upper_dev_link(vport
->dev
,
116 get_dpdev(vport
->dp
),
121 err
= netdev_rx_handler_register(vport
->dev
, netdev_frame_hook
,
124 goto error_master_upper_dev_unlink
;
126 dev_disable_lro(vport
->dev
);
127 dev_set_promiscuity(vport
->dev
, 1);
128 vport
->dev
->priv_flags
|= IFF_OVS_DATAPATH
;
133 error_master_upper_dev_unlink
:
134 netdev_upper_dev_unlink(vport
->dev
, get_dpdev(vport
->dp
));
140 ovs_vport_free(vport
);
143 EXPORT_SYMBOL_GPL(ovs_netdev_link
);
145 static struct vport
*netdev_create(const struct vport_parms
*parms
)
149 vport
= ovs_vport_alloc(0, &ovs_netdev_vport_ops
, parms
);
153 return ovs_netdev_link(vport
, parms
->name
);
156 static void vport_netdev_free(struct rcu_head
*rcu
)
158 struct vport
*vport
= container_of(rcu
, struct vport
, rcu
);
162 ovs_vport_free(vport
);
165 void ovs_netdev_detach_dev(struct vport
*vport
)
168 vport
->dev
->priv_flags
&= ~IFF_OVS_DATAPATH
;
169 netdev_rx_handler_unregister(vport
->dev
);
170 netdev_upper_dev_unlink(vport
->dev
,
171 netdev_master_upper_dev_get(vport
->dev
));
172 dev_set_promiscuity(vport
->dev
, -1);
175 static void netdev_destroy(struct vport
*vport
)
178 if (vport
->dev
->priv_flags
& IFF_OVS_DATAPATH
)
179 ovs_netdev_detach_dev(vport
);
182 call_rcu(&vport
->rcu
, vport_netdev_free
);
185 void ovs_netdev_tunnel_destroy(struct vport
*vport
)
188 if (vport
->dev
->priv_flags
& IFF_OVS_DATAPATH
)
189 ovs_netdev_detach_dev(vport
);
191 /* We can be invoked by both explicit vport deletion and
192 * underlying netdev deregistration; delete the link only
193 * if it's not already shutting down.
195 if (vport
->dev
->reg_state
== NETREG_REGISTERED
)
196 rtnl_delete_link(vport
->dev
);
201 call_rcu(&vport
->rcu
, vport_netdev_free
);
203 EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy
);
205 /* Returns null if this device is not attached to a datapath. */
206 struct vport
*ovs_netdev_get_vport(struct net_device
*dev
)
208 if (likely(dev
->priv_flags
& IFF_OVS_DATAPATH
))
209 return (struct vport
*)
210 rcu_dereference_rtnl(dev
->rx_handler_data
);
215 static struct vport_ops ovs_netdev_vport_ops
= {
216 .type
= OVS_VPORT_TYPE_NETDEV
,
217 .create
= netdev_create
,
218 .destroy
= netdev_destroy
,
219 .send
= dev_queue_xmit
,
222 int __init
ovs_netdev_init(void)
224 return ovs_vport_ops_register(&ovs_netdev_vport_ops
);
227 void ovs_netdev_exit(void)
229 ovs_vport_ops_unregister(&ovs_netdev_vport_ops
);