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/netdevice.h>
35 #include "vport-internal_dev.h"
36 #include "vport-netdev.h"
38 static void netdev_port_receive(struct vport
*vport
, struct sk_buff
*skb
);
40 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
41 /* Called with rcu_read_lock and bottom-halves disabled. */
42 static rx_handler_result_t
netdev_frame_hook(struct sk_buff
**pskb
)
44 struct sk_buff
*skb
= *pskb
;
47 if (unlikely(skb
->pkt_type
== PACKET_LOOPBACK
))
48 return RX_HANDLER_PASS
;
50 vport
= ovs_netdev_get_vport(skb
->dev
);
52 netdev_port_receive(vport
, skb
);
54 return RX_HANDLER_CONSUMED
;
56 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36) || \
57 defined HAVE_RHEL_OVS_HOOK
58 /* Called with rcu_read_lock and bottom-halves disabled. */
59 static struct sk_buff
*netdev_frame_hook(struct sk_buff
*skb
)
63 if (unlikely(skb
->pkt_type
== PACKET_LOOPBACK
))
66 vport
= ovs_netdev_get_vport(skb
->dev
);
68 netdev_port_receive(vport
, skb
);
72 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,32)
74 * Used as br_handle_frame_hook. (Cannot run bridge at the same time, even on
75 * different set of devices!)
77 /* Called with rcu_read_lock and bottom-halves disabled. */
78 static struct sk_buff
*netdev_frame_hook(struct net_bridge_port
*p
,
81 netdev_port_receive((struct vport
*)p
, skb
);
88 static struct net_device
*get_dpdev(struct datapath
*dp
)
92 local
= ovs_vport_ovsl(dp
, OVSP_LOCAL
);
94 return netdev_vport_priv(local
)->dev
;
97 static struct vport
*netdev_create(const struct vport_parms
*parms
)
100 struct netdev_vport
*netdev_vport
;
103 vport
= ovs_vport_alloc(sizeof(struct netdev_vport
),
104 &ovs_netdev_vport_ops
, parms
);
106 err
= PTR_ERR(vport
);
110 netdev_vport
= netdev_vport_priv(vport
);
112 netdev_vport
->dev
= dev_get_by_name(ovs_dp_get_net(vport
->dp
), parms
->name
);
113 if (!netdev_vport
->dev
) {
115 goto error_free_vport
;
118 if (netdev_vport
->dev
->flags
& IFF_LOOPBACK
||
119 netdev_vport
->dev
->type
!= ARPHRD_ETHER
||
120 ovs_is_internal_dev(netdev_vport
->dev
)) {
126 err
= netdev_master_upper_dev_link(netdev_vport
->dev
,
127 get_dpdev(vport
->dp
));
131 err
= netdev_rx_handler_register(netdev_vport
->dev
, netdev_frame_hook
,
134 goto error_master_upper_dev_unlink
;
136 dev_set_promiscuity(netdev_vport
->dev
, 1);
137 netdev_vport
->dev
->priv_flags
|= IFF_OVS_DATAPATH
;
142 error_master_upper_dev_unlink
:
143 netdev_upper_dev_unlink(netdev_vport
->dev
, get_dpdev(vport
->dp
));
147 dev_put(netdev_vport
->dev
);
149 ovs_vport_free(vport
);
154 static void free_port_rcu(struct rcu_head
*rcu
)
156 struct netdev_vport
*netdev_vport
= container_of(rcu
,
157 struct netdev_vport
, rcu
);
159 dev_put(netdev_vport
->dev
);
160 ovs_vport_free(vport_from_priv(netdev_vport
));
163 void ovs_netdev_detach_dev(struct vport
*vport
)
165 struct netdev_vport
*netdev_vport
= netdev_vport_priv(vport
);
168 netdev_vport
->dev
->priv_flags
&= ~IFF_OVS_DATAPATH
;
169 netdev_rx_handler_unregister(netdev_vport
->dev
);
170 netdev_upper_dev_unlink(netdev_vport
->dev
,
171 netdev_master_upper_dev_get(netdev_vport
->dev
));
172 dev_set_promiscuity(netdev_vport
->dev
, -1);
175 static void netdev_destroy(struct vport
*vport
)
177 struct netdev_vport
*netdev_vport
= netdev_vport_priv(vport
);
180 if (ovs_netdev_get_vport(netdev_vport
->dev
))
181 ovs_netdev_detach_dev(vport
);
184 call_rcu(&netdev_vport
->rcu
, free_port_rcu
);
187 const char *ovs_netdev_get_name(const struct vport
*vport
)
189 const struct netdev_vport
*netdev_vport
= netdev_vport_priv(vport
);
190 return netdev_vport
->dev
->name
;
193 /* Must be called with rcu_read_lock. */
194 static void netdev_port_receive(struct vport
*vport
, struct sk_buff
*skb
)
196 if (unlikely(!vport
))
199 if (unlikely(skb_warn_if_lro(skb
)))
202 /* Make our own copy of the packet. Otherwise we will mangle the
203 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
204 * (No one comes after us, since we tell handle_bridge() that we took
206 skb
= skb_share_check(skb
, GFP_ATOMIC
);
210 skb_push(skb
, ETH_HLEN
);
211 ovs_skb_postpush_rcsum(skb
, skb
->data
, ETH_HLEN
);
213 ovs_vport_receive(vport
, skb
, NULL
);
220 static unsigned int packet_length(const struct sk_buff
*skb
)
222 unsigned int length
= skb
->len
- ETH_HLEN
;
224 if (skb
->protocol
== htons(ETH_P_8021Q
))
230 static int netdev_send(struct vport
*vport
, struct sk_buff
*skb
)
232 struct netdev_vport
*netdev_vport
= netdev_vport_priv(vport
);
233 int mtu
= netdev_vport
->dev
->mtu
;
236 if (unlikely(packet_length(skb
) > mtu
&& !skb_is_gso(skb
))) {
237 net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
238 netdev_vport
->dev
->name
,
239 packet_length(skb
), mtu
);
243 skb
->dev
= netdev_vport
->dev
;
254 /* Returns null if this device is not attached to a datapath. */
255 struct vport
*ovs_netdev_get_vport(struct net_device
*dev
)
257 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36) || \
258 defined HAVE_RHEL_OVS_HOOK
259 #ifdef HAVE_OVS_DATAPATH
260 if (likely(dev
->priv_flags
& IFF_OVS_DATAPATH
))
262 if (likely(rcu_access_pointer(dev
->rx_handler
) == netdev_frame_hook
))
264 #ifdef HAVE_RHEL_OVS_HOOK
265 return (struct vport
*)rcu_dereference_rtnl(dev
->ax25_ptr
);
267 return (struct vport
*)rcu_dereference_rtnl(dev
->rx_handler_data
);
272 return (struct vport
*)rcu_dereference_rtnl(dev
->br_port
);
276 const struct vport_ops ovs_netdev_vport_ops
= {
277 .type
= OVS_VPORT_TYPE_NETDEV
,
278 .create
= netdev_create
,
279 .destroy
= netdev_destroy
,
280 .get_name
= ovs_netdev_get_name
,
284 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) && \
285 !defined HAVE_RHEL_OVS_HOOK
287 * Enforces, mutual exclusion with the Linux bridge module, by declaring and
288 * exporting br_should_route_hook. Because the bridge module also exports the
289 * same symbol, the module loader will refuse to load both modules at the same
290 * time (e.g. "bridge: exports duplicate symbol br_should_route_hook (owned by
293 * Before Linux 2.6.36, Open vSwitch cannot safely coexist with the Linux
294 * bridge module, so openvswitch uses this macro in those versions. In
295 * Linux 2.6.36 and later, Open vSwitch can coexist with the bridge module.
297 * The use of "typeof" here avoids the need to track changes in the type of
298 * br_should_route_hook over various kernel versions.
300 typeof(br_should_route_hook
) br_should_route_hook
;
301 EXPORT_SYMBOL(br_should_route_hook
);