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>
20 #include "vport-internal_dev.h"
21 #include "vport-netdev.h"
25 /* If the native device stats aren't 64 bit use the vport stats tracking instead. */
26 #define USE_VPORT_STATS (sizeof(((struct net_device_stats *)0)->rx_bytes) < sizeof(u64))
28 static void netdev_port_receive(struct vport *vport, struct sk_buff *skb);
30 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
31 /* Called with rcu_read_lock and bottom-halves disabled. */
32 static struct sk_buff *netdev_frame_hook(struct sk_buff *skb)
36 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
39 vport = netdev_get_vport(skb->dev);
41 netdev_port_receive(vport, skb);
45 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
47 * Used as br_handle_frame_hook. (Cannot run bridge at the same time, even on
48 * different set of devices!)
50 /* Called with rcu_read_lock and bottom-halves disabled. */
51 static struct sk_buff *netdev_frame_hook(struct net_bridge_port *p,
54 netdev_port_receive((struct vport *)p, skb);
57 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
59 * Used as br_handle_frame_hook. (Cannot run bridge at the same time, even on
60 * different set of devices!)
62 /* Called with rcu_read_lock and bottom-halves disabled. */
63 static int netdev_frame_hook(struct net_bridge_port *p, struct sk_buff **pskb)
65 netdev_port_receive((struct vport *)p, *pskb);
72 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
73 static int netdev_init(void) { return 0; }
74 static void netdev_exit(void) { }
76 static int netdev_init(void)
78 /* Hook into callback used by the bridge to intercept packets.
79 * Parasites we are. */
80 br_handle_frame_hook = netdev_frame_hook;
85 static void netdev_exit(void)
87 br_handle_frame_hook = NULL;
91 static struct vport *netdev_create(const char *name, const void __user *config)
94 struct netdev_vport *netdev_vport;
97 vport = vport_alloc(sizeof(struct netdev_vport), &netdev_vport_ops);
103 netdev_vport = netdev_vport_priv(vport);
105 netdev_vport->dev = dev_get_by_name(&init_net, name);
106 if (!netdev_vport->dev) {
108 goto error_free_vport;
111 if (netdev_vport->dev->flags & IFF_LOOPBACK ||
112 netdev_vport->dev->type != ARPHRD_ETHER ||
113 is_internal_dev(netdev_vport->dev)) {
118 /* If we are using the vport stats layer initialize it to the current
119 * values so we are roughly consistent with the device stats. */
120 if (USE_VPORT_STATS) {
121 struct odp_vport_stats stats;
123 err = netdev_get_stats(vport, &stats);
125 vport_set_stats(vport, &stats);
131 dev_put(netdev_vport->dev);
138 static int netdev_destroy(struct vport *vport)
140 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
142 dev_put(netdev_vport->dev);
148 static int netdev_attach(struct vport *vport)
150 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
153 err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook,
158 dev_set_promiscuity(netdev_vport->dev, 1);
159 dev_disable_lro(netdev_vport->dev);
160 netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH;
165 static int netdev_detach(struct vport *vport)
167 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
169 netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
170 netdev_rx_handler_unregister(netdev_vport->dev);
171 dev_set_promiscuity(netdev_vport->dev, -1);
176 int netdev_set_mtu(struct vport *vport, int mtu)
178 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
179 return dev_set_mtu(netdev_vport->dev, mtu);
182 int netdev_set_addr(struct vport *vport, const unsigned char *addr)
184 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
187 sa.sa_family = ARPHRD_ETHER;
188 memcpy(sa.sa_data, addr, ETH_ALEN);
190 return dev_set_mac_address(netdev_vport->dev, &sa);
193 const char *netdev_get_name(const struct vport *vport)
195 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
196 return netdev_vport->dev->name;
199 const unsigned char *netdev_get_addr(const struct vport *vport)
201 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
202 return netdev_vport->dev->dev_addr;
205 struct kobject *netdev_get_kobj(const struct vport *vport)
207 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
208 return &netdev_vport->dev->NETDEV_DEV_MEMBER.kobj;
211 int netdev_get_stats(const struct vport *vport, struct odp_vport_stats *stats)
213 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
214 struct rtnl_link_stats64 *netdev_stats, storage;
216 netdev_stats = dev_get_stats(netdev_vport->dev, &storage);
218 stats->rx_bytes = netdev_stats->rx_bytes;
219 stats->rx_packets = netdev_stats->rx_packets;
220 stats->tx_bytes = netdev_stats->tx_bytes;
221 stats->tx_packets = netdev_stats->tx_packets;
222 stats->rx_dropped = netdev_stats->rx_dropped;
223 stats->rx_errors = netdev_stats->rx_errors;
224 stats->rx_frame_err = netdev_stats->rx_frame_errors;
225 stats->rx_over_err = netdev_stats->rx_over_errors;
226 stats->rx_crc_err = netdev_stats->rx_crc_errors;
227 stats->tx_dropped = netdev_stats->tx_dropped;
228 stats->tx_errors = netdev_stats->tx_errors;
229 stats->collisions = netdev_stats->collisions;
234 unsigned netdev_get_dev_flags(const struct vport *vport)
236 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
237 return dev_get_flags(netdev_vport->dev);
240 int netdev_is_running(const struct vport *vport)
242 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
243 return netif_running(netdev_vport->dev);
246 unsigned char netdev_get_operstate(const struct vport *vport)
248 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
249 return netdev_vport->dev->operstate;
252 int netdev_get_ifindex(const struct vport *vport)
254 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
255 return netdev_vport->dev->ifindex;
258 int netdev_get_iflink(const struct vport *vport)
260 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
261 return netdev_vport->dev->iflink;
264 int netdev_get_mtu(const struct vport *vport)
266 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
267 return netdev_vport->dev->mtu;
270 /* Must be called with rcu_read_lock. */
271 static void netdev_port_receive(struct vport *vport, struct sk_buff *skb)
273 /* Make our own copy of the packet. Otherwise we will mangle the
274 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
275 * (No one comes after us, since we tell handle_bridge() that we took
277 skb = skb_share_check(skb, GFP_ATOMIC);
281 skb_warn_if_lro(skb);
283 /* Push the Ethernet header back on. */
284 skb_push(skb, ETH_HLEN);
285 skb_reset_mac_header(skb);
286 compute_ip_summed(skb, false);
288 vport_receive(vport, skb);
291 static int netdev_send(struct vport *vport, struct sk_buff *skb)
293 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
296 skb->dev = netdev_vport->dev;
297 forward_ip_summed(skb);
303 /* Returns null if this device is not attached to a datapath. */
304 struct vport *netdev_get_vport(struct net_device *dev)
306 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
307 /* XXX: The bridge code may have registered the data.
308 * So check that the handler pointer is the datapath's.
309 * Once the merge is done and IFF_OVS_DATAPATH stops
310 * being the same value as IFF_BRIDGE_PORT the check can
311 * simply be netdev_vport->dev->priv_flags & IFF_OVS_DATAPATH. */
312 if (rcu_dereference(dev->rx_handler) != netdev_frame_hook)
314 return (struct vport *)rcu_dereference(dev->rx_handler_data);
316 return (struct vport *)rcu_dereference(dev->br_port);
320 struct vport_ops netdev_vport_ops = {
322 .flags = (VPORT_F_REQUIRED |
323 (USE_VPORT_STATS ? VPORT_F_GEN_STATS : 0)),
326 .create = netdev_create,
327 .destroy = netdev_destroy,
328 .attach = netdev_attach,
329 .detach = netdev_detach,
330 .set_mtu = netdev_set_mtu,
331 .set_addr = netdev_set_addr,
332 .get_name = netdev_get_name,
333 .get_addr = netdev_get_addr,
334 .get_kobj = netdev_get_kobj,
335 .get_stats = netdev_get_stats,
336 .get_dev_flags = netdev_get_dev_flags,
337 .is_running = netdev_is_running,
338 .get_operstate = netdev_get_operstate,
339 .get_ifindex = netdev_get_ifindex,
340 .get_iflink = netdev_get_iflink,
341 .get_mtu = netdev_get_mtu,
345 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
347 * In kernels earlier than 2.6.36, Open vSwitch cannot safely coexist with
348 * the Linux bridge module on any released version of Linux, because there
349 * is only a single bridge hook function and only a single br_port member
350 * in struct net_device.
352 * Declaring and exporting this symbol enforces mutual exclusion. The bridge
353 * module also exports the same symbol, so the module loader will refuse to
354 * load both modules at the same time (e.g. "bridge: exports duplicate symbol
355 * br_should_route_hook (owned by openvswitch_mod)").
357 * The use of "typeof" here avoids the need to track changes in the type of
358 * br_should_route_hook over various kernel versions.
360 typeof(br_should_route_hook) br_should_route_hook;
361 EXPORT_SYMBOL(br_should_route_hook);