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 net_bridge_port *, struct sk_buff *);
31 * Used as br_handle_frame_hook. (Cannot run bridge at the same time, even on
32 * different set of devices!)
34 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
35 /* Called with rcu_read_lock and bottom-halves disabled. */
36 static struct sk_buff *netdev_frame_hook(struct net_bridge_port *p,
39 netdev_port_receive(p, skb);
42 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
43 /* Called with rcu_read_lock and bottom-halves disabled. */
44 static int netdev_frame_hook(struct net_bridge_port *p, struct sk_buff **pskb)
46 netdev_port_receive(p, *pskb);
53 static int netdev_init(void)
55 /* Hook into callback used by the bridge to intercept packets.
56 * Parasites we are. */
57 br_handle_frame_hook = netdev_frame_hook;
62 static void netdev_exit(void)
64 br_handle_frame_hook = NULL;
67 static struct vport *netdev_create(const char *name, const void __user *config)
70 struct netdev_vport *netdev_vport;
73 vport = vport_alloc(sizeof(struct netdev_vport), &netdev_vport_ops);
79 netdev_vport = netdev_vport_priv(vport);
81 netdev_vport->dev = dev_get_by_name(&init_net, name);
82 if (!netdev_vport->dev) {
84 goto error_free_vport;
87 if (netdev_vport->dev->flags & IFF_LOOPBACK ||
88 netdev_vport->dev->type != ARPHRD_ETHER ||
89 is_internal_dev(netdev_vport->dev)) {
94 if (netdev_vport->dev->br_port) {
99 /* If we are using the vport stats layer initialize it to the current
100 * values so we are roughly consistent with the device stats. */
101 if (USE_VPORT_STATS) {
102 struct odp_vport_stats stats;
104 err = netdev_get_stats(vport, &stats);
106 vport_set_stats(vport, &stats);
112 dev_put(netdev_vport->dev);
119 static int netdev_destroy(struct vport *vport)
121 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
123 dev_put(netdev_vport->dev);
129 static int netdev_attach(struct vport *vport)
131 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
133 dev_set_promiscuity(netdev_vport->dev, 1);
134 dev_disable_lro(netdev_vport->dev);
135 rcu_assign_pointer(netdev_vport->dev->br_port, (struct net_bridge_port *)vport);
140 static int netdev_detach(struct vport *vport)
142 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
144 rcu_assign_pointer(netdev_vport->dev->br_port, NULL);
145 dev_set_promiscuity(netdev_vport->dev, -1);
150 int netdev_set_mtu(struct vport *vport, int mtu)
152 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
153 return dev_set_mtu(netdev_vport->dev, mtu);
156 int netdev_set_addr(struct vport *vport, const unsigned char *addr)
158 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
161 sa.sa_family = ARPHRD_ETHER;
162 memcpy(sa.sa_data, addr, ETH_ALEN);
164 return dev_set_mac_address(netdev_vport->dev, &sa);
167 const char *netdev_get_name(const struct vport *vport)
169 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
170 return netdev_vport->dev->name;
173 const unsigned char *netdev_get_addr(const struct vport *vport)
175 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
176 return netdev_vport->dev->dev_addr;
179 struct kobject *netdev_get_kobj(const struct vport *vport)
181 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
182 return &netdev_vport->dev->NETDEV_DEV_MEMBER.kobj;
185 int netdev_get_stats(const struct vport *vport, struct odp_vport_stats *stats)
187 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
188 const struct net_device_stats *netdev_stats;
190 netdev_stats = dev_get_stats(netdev_vport->dev);
192 stats->rx_bytes = netdev_stats->rx_bytes;
193 stats->rx_packets = netdev_stats->rx_packets;
194 stats->tx_bytes = netdev_stats->tx_bytes;
195 stats->tx_packets = netdev_stats->tx_packets;
196 stats->rx_dropped = netdev_stats->rx_dropped;
197 stats->rx_errors = netdev_stats->rx_errors;
198 stats->rx_frame_err = netdev_stats->rx_frame_errors;
199 stats->rx_over_err = netdev_stats->rx_over_errors;
200 stats->rx_crc_err = netdev_stats->rx_crc_errors;
201 stats->tx_dropped = netdev_stats->tx_dropped;
202 stats->tx_errors = netdev_stats->tx_errors;
203 stats->collisions = netdev_stats->collisions;
208 unsigned netdev_get_dev_flags(const struct vport *vport)
210 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
211 return dev_get_flags(netdev_vport->dev);
214 int netdev_is_running(const struct vport *vport)
216 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
217 return netif_running(netdev_vport->dev);
220 unsigned char netdev_get_operstate(const struct vport *vport)
222 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
223 return netdev_vport->dev->operstate;
226 int netdev_get_ifindex(const struct vport *vport)
228 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
229 return netdev_vport->dev->ifindex;
232 int netdev_get_iflink(const struct vport *vport)
234 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
235 return netdev_vport->dev->iflink;
238 int netdev_get_mtu(const struct vport *vport)
240 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
241 return netdev_vport->dev->mtu;
244 /* Must be called with rcu_read_lock. */
245 static void netdev_port_receive(struct net_bridge_port *p, struct sk_buff *skb)
247 struct vport *vport = (struct vport *)p;
249 /* Make our own copy of the packet. Otherwise we will mangle the
250 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
251 * (No one comes after us, since we tell handle_bridge() that we took
253 skb = skb_share_check(skb, GFP_ATOMIC);
257 /* Push the Ethernet header back on. */
258 skb_push(skb, ETH_HLEN);
259 skb_reset_mac_header(skb);
260 compute_ip_summed(skb, false);
262 vport_receive(vport, skb);
265 static int netdev_send(struct vport *vport, struct sk_buff *skb)
267 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
270 skb->dev = netdev_vport->dev;
271 forward_ip_summed(skb);
277 /* Returns null if this device is not attached to a datapath. */
278 struct vport *netdev_get_vport(struct net_device *dev)
280 return (struct vport *)dev->br_port;
283 struct vport_ops netdev_vport_ops = {
285 .flags = (VPORT_F_REQUIRED |
286 (USE_VPORT_STATS ? VPORT_F_GEN_STATS : 0)),
289 .create = netdev_create,
290 .destroy = netdev_destroy,
291 .attach = netdev_attach,
292 .detach = netdev_detach,
293 .set_mtu = netdev_set_mtu,
294 .set_addr = netdev_set_addr,
295 .get_name = netdev_get_name,
296 .get_addr = netdev_get_addr,
297 .get_kobj = netdev_get_kobj,
298 .get_stats = netdev_get_stats,
299 .get_dev_flags = netdev_get_dev_flags,
300 .is_running = netdev_is_running,
301 .get_operstate = netdev_get_operstate,
302 .get_ifindex = netdev_get_ifindex,
303 .get_iflink = netdev_get_iflink,
304 .get_mtu = netdev_get_mtu,
309 * Open vSwitch cannot safely coexist with the Linux bridge module on any
310 * released version of Linux, because there is only a single bridge hook
311 * function and only a single br_port member in struct net_device.
313 * Declaring and exporting this symbol enforces mutual exclusion. The bridge
314 * module also exports the same symbol, so the module loader will refuse to
315 * load both modules at the same time (e.g. "bridge: exports duplicate symbol
316 * br_should_route_hook (owned by openvswitch_mod)").
318 * The use of "typeof" here avoids the need to track changes in the type of
319 * br_should_route_hook over various kernel versions.
321 typeof(br_should_route_hook) br_should_route_hook;
322 EXPORT_SYMBOL(br_should_route_hook);