2 * Copyright (c) 2010 Nicira Networks.
3 * Distributed under the terms of the GNU GPL version 2.
5 * Significant portions of this file may be copied from parts of the Linux
6 * kernel, by Linus Torvalds and others.
9 #include <linux/if_arp.h>
10 #include <linux/if_bridge.h>
11 #include <linux/if_vlan.h>
12 #include <linux/kernel.h>
13 #include <linux/llc.h>
14 #include <linux/rtnetlink.h>
15 #include <linux/skbuff.h>
21 #include "vport-internal_dev.h"
22 #include "vport-netdev.h"
26 /* If the native device stats aren't 64 bit use the vport stats tracking instead. */
27 #define USE_VPORT_STATS (sizeof(((struct net_device_stats *)0)->rx_bytes) < sizeof(u64))
29 static void netdev_port_receive(struct vport
*vport
, struct sk_buff
*skb
);
31 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
32 /* Called with rcu_read_lock and bottom-halves disabled. */
33 static struct sk_buff
*netdev_frame_hook(struct sk_buff
*skb
)
37 if (unlikely(skb
->pkt_type
== PACKET_LOOPBACK
))
40 vport
= netdev_get_vport(skb
->dev
);
42 netdev_port_receive(vport
, skb
);
46 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
48 * Used as br_handle_frame_hook. (Cannot run bridge at the same time, even on
49 * different set of devices!)
51 /* Called with rcu_read_lock and bottom-halves disabled. */
52 static struct sk_buff
*netdev_frame_hook(struct net_bridge_port
*p
,
55 netdev_port_receive((struct vport
*)p
, skb
);
58 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
60 * Used as br_handle_frame_hook. (Cannot run bridge at the same time, even on
61 * different set of devices!)
63 /* Called with rcu_read_lock and bottom-halves disabled. */
64 static int netdev_frame_hook(struct net_bridge_port
*p
, struct sk_buff
**pskb
)
66 netdev_port_receive((struct vport
*)p
, *pskb
);
73 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
74 static int netdev_init(void) { return 0; }
75 static void netdev_exit(void) { }
77 static int netdev_init(void)
79 /* Hook into callback used by the bridge to intercept packets.
80 * Parasites we are. */
81 br_handle_frame_hook
= netdev_frame_hook
;
86 static void netdev_exit(void)
88 br_handle_frame_hook
= NULL
;
92 static struct vport
*netdev_create(const struct vport_parms
*parms
)
95 struct netdev_vport
*netdev_vport
;
98 vport
= vport_alloc(sizeof(struct netdev_vport
), &netdev_vport_ops
, parms
);
100 err
= PTR_ERR(vport
);
104 netdev_vport
= netdev_vport_priv(vport
);
106 netdev_vport
->dev
= dev_get_by_name(&init_net
, parms
->name
);
107 if (!netdev_vport
->dev
) {
109 goto error_free_vport
;
112 if (netdev_vport
->dev
->flags
& IFF_LOOPBACK
||
113 netdev_vport
->dev
->type
!= ARPHRD_ETHER
||
114 is_internal_dev(netdev_vport
->dev
)) {
119 /* If we are using the vport stats layer initialize it to the current
120 * values so we are roughly consistent with the device stats. */
121 if (USE_VPORT_STATS
) {
122 struct rtnl_link_stats64 stats
;
124 err
= netdev_get_stats(vport
, &stats
);
126 vport_set_stats(vport
, &stats
);
129 err
= netdev_rx_handler_register(netdev_vport
->dev
, netdev_frame_hook
,
134 dev_set_promiscuity(netdev_vport
->dev
, 1);
135 dev_disable_lro(netdev_vport
->dev
);
136 netdev_vport
->dev
->priv_flags
|= IFF_OVS_DATAPATH
;
141 dev_put(netdev_vport
->dev
);
148 static int netdev_destroy(struct vport
*vport
)
150 struct netdev_vport
*netdev_vport
= netdev_vport_priv(vport
);
152 netdev_vport
->dev
->priv_flags
&= ~IFF_OVS_DATAPATH
;
153 netdev_rx_handler_unregister(netdev_vport
->dev
);
154 dev_set_promiscuity(netdev_vport
->dev
, -1);
158 dev_put(netdev_vport
->dev
);
164 int netdev_set_mtu(struct vport
*vport
, int mtu
)
166 struct netdev_vport
*netdev_vport
= netdev_vport_priv(vport
);
167 return dev_set_mtu(netdev_vport
->dev
, mtu
);
170 int netdev_set_addr(struct vport
*vport
, const unsigned char *addr
)
172 struct netdev_vport
*netdev_vport
= netdev_vport_priv(vport
);
175 sa
.sa_family
= ARPHRD_ETHER
;
176 memcpy(sa
.sa_data
, addr
, ETH_ALEN
);
178 return dev_set_mac_address(netdev_vport
->dev
, &sa
);
181 const char *netdev_get_name(const struct vport
*vport
)
183 const struct netdev_vport
*netdev_vport
= netdev_vport_priv(vport
);
184 return netdev_vport
->dev
->name
;
187 const unsigned char *netdev_get_addr(const struct vport
*vport
)
189 const struct netdev_vport
*netdev_vport
= netdev_vport_priv(vport
);
190 return netdev_vport
->dev
->dev_addr
;
193 struct kobject
*netdev_get_kobj(const struct vport
*vport
)
195 const struct netdev_vport
*netdev_vport
= netdev_vport_priv(vport
);
196 return &netdev_vport
->dev
->NETDEV_DEV_MEMBER
.kobj
;
199 int netdev_get_stats(const struct vport
*vport
, struct rtnl_link_stats64
*stats
)
201 const struct netdev_vport
*netdev_vport
= netdev_vport_priv(vport
);
202 dev_get_stats(netdev_vport
->dev
, stats
);
206 unsigned netdev_get_dev_flags(const struct vport
*vport
)
208 const struct netdev_vport
*netdev_vport
= netdev_vport_priv(vport
);
209 return dev_get_flags(netdev_vport
->dev
);
212 int netdev_is_running(const struct vport
*vport
)
214 const struct netdev_vport
*netdev_vport
= netdev_vport_priv(vport
);
215 return netif_running(netdev_vport
->dev
);
218 unsigned char netdev_get_operstate(const struct vport
*vport
)
220 const struct netdev_vport
*netdev_vport
= netdev_vport_priv(vport
);
221 return netdev_vport
->dev
->operstate
;
224 int netdev_get_ifindex(const struct vport
*vport
)
226 const struct netdev_vport
*netdev_vport
= netdev_vport_priv(vport
);
227 return netdev_vport
->dev
->ifindex
;
230 int netdev_get_iflink(const struct vport
*vport
)
232 const struct netdev_vport
*netdev_vport
= netdev_vport_priv(vport
);
233 return netdev_vport
->dev
->iflink
;
236 int netdev_get_mtu(const struct vport
*vport
)
238 const struct netdev_vport
*netdev_vport
= netdev_vport_priv(vport
);
239 return netdev_vport
->dev
->mtu
;
242 /* Must be called with rcu_read_lock. */
243 static void netdev_port_receive(struct vport
*vport
, struct sk_buff
*skb
)
245 /* Make our own copy of the packet. Otherwise we will mangle the
246 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
247 * (No one comes after us, since we tell handle_bridge() that we took
249 skb
= skb_share_check(skb
, GFP_ATOMIC
);
253 skb_warn_if_lro(skb
);
255 skb_push(skb
, ETH_HLEN
);
256 compute_ip_summed(skb
, false);
258 vport_receive(vport
, skb
);
261 static int netdev_send(struct vport
*vport
, struct sk_buff
*skb
)
263 struct netdev_vport
*netdev_vport
= netdev_vport_priv(vport
);
266 skb
->dev
= netdev_vport
->dev
;
267 forward_ip_summed(skb
);
273 /* Returns null if this device is not attached to a datapath. */
274 struct vport
*netdev_get_vport(struct net_device
*dev
)
276 #ifdef IFF_BRIDGE_PORT
277 #if IFF_BRIDGE_PORT != IFF_OVS_DATAPATH
278 if (likely(dev
->priv_flags
& IFF_OVS_DATAPATH
))
280 if (likely(rcu_access_pointer(dev
->rx_handler
) == netdev_frame_hook
))
282 return (struct vport
*)rcu_dereference_rtnl(dev
->rx_handler_data
);
286 return (struct vport
*)rcu_dereference_rtnl(dev
->br_port
);
290 const struct vport_ops netdev_vport_ops
= {
292 .flags
= (VPORT_F_REQUIRED
|
293 (USE_VPORT_STATS
? VPORT_F_GEN_STATS
: 0)),
296 .create
= netdev_create
,
297 .destroy
= netdev_destroy
,
298 .set_mtu
= netdev_set_mtu
,
299 .set_addr
= netdev_set_addr
,
300 .get_name
= netdev_get_name
,
301 .get_addr
= netdev_get_addr
,
302 .get_kobj
= netdev_get_kobj
,
303 .get_stats
= netdev_get_stats
,
304 .get_dev_flags
= netdev_get_dev_flags
,
305 .is_running
= netdev_is_running
,
306 .get_operstate
= netdev_get_operstate
,
307 .get_ifindex
= netdev_get_ifindex
,
308 .get_iflink
= netdev_get_iflink
,
309 .get_mtu
= netdev_get_mtu
,
313 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
315 * In kernels earlier than 2.6.36, Open vSwitch cannot safely coexist with
316 * the Linux bridge module on any released version of Linux, because there
317 * is only a single bridge hook function and only a single br_port member
318 * in struct net_device.
320 * Declaring and exporting this symbol enforces mutual exclusion. The bridge
321 * module also exports the same symbol, so the module loader will refuse to
322 * load both modules at the same time (e.g. "bridge: exports duplicate symbol
323 * br_should_route_hook (owned by openvswitch_mod)").
325 * The use of "typeof" here avoids the need to track changes in the type of
326 * br_should_route_hook over various kernel versions.
328 typeof(br_should_route_hook
) br_should_route_hook
;
329 EXPORT_SYMBOL(br_should_route_hook
);