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 struct vport_ops netdev_vport_ops;
27 static void netdev_port_receive(struct net_bridge_port *, struct sk_buff *);
29 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,27)
30 static struct llc_sap *netdev_stp_sap;
33 netdev_stp_rcv(struct sk_buff *skb, struct net_device *dev,
34 struct packet_type *pt, struct net_device *orig_dev)
36 /* We don't really care about STP packets, we just listen for them for
37 * mutual exclusion with the bridge module, so this just discards
44 netdev_avoid_bridge_init(void)
46 /* Register to receive STP packets because the bridge module also
47 * attempts to do so. Since there can only be a single listener for a
48 * given protocol, this provides mutual exclusion against the bridge
49 * module, preventing both of them from being loaded at the same
51 netdev_stp_sap = llc_sap_open(LLC_SAP_BSPAN, netdev_stp_rcv);
52 if (!netdev_stp_sap) {
53 printk(KERN_ERR "openvswitch: can't register sap for STP (probably the bridge module is loaded)\n");
60 netdev_avoid_bridge_exit(void)
62 llc_sap_put(netdev_stp_sap);
64 #else /* Linux 2.6.27 or later. */
66 netdev_avoid_bridge_init(void)
68 /* Linux 2.6.27 introduces a way for multiple clients to register for
69 * STP packets, which interferes with what we try to do above.
70 * Instead, just check whether there's a bridge hook defined. This is
71 * not as safe--the bridge module is willing to load over the top of
72 * us--but it provides a little bit of protection. */
73 if (br_handle_frame_hook) {
74 printk(KERN_ERR "openvswitch: bridge module is loaded, cannot load over it\n");
81 netdev_avoid_bridge_exit(void)
85 #endif /* Linux 2.6.27 or later */
88 * Used as br_handle_frame_hook. (Cannot run bridge at the same time, even on
89 * different set of devices!)
91 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
92 /* Called with rcu_read_lock and bottom-halves disabled. */
93 static struct sk_buff *
94 netdev_frame_hook(struct net_bridge_port *p, struct sk_buff *skb)
96 netdev_port_receive(p, skb);
99 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
100 /* Called with rcu_read_lock and bottom-halves disabled. */
102 netdev_frame_hook(struct net_bridge_port *p, struct sk_buff **pskb)
104 netdev_port_receive(p, *pskb);
116 err = netdev_avoid_bridge_init();
120 /* Hook into callback used by the bridge to intercept packets.
121 * Parasites we are. */
122 br_handle_frame_hook = netdev_frame_hook;
130 br_handle_frame_hook = NULL;
131 netdev_avoid_bridge_exit();
134 static struct vport *
135 netdev_create(const char *name, const void __user *config)
138 struct netdev_vport *netdev_vport;
141 vport = vport_alloc(sizeof(struct netdev_vport), &netdev_vport_ops);
143 err = PTR_ERR(vport);
147 netdev_vport = netdev_vport_priv(vport);
149 netdev_vport->dev = dev_get_by_name(&init_net, name);
150 if (!netdev_vport->dev) {
152 goto error_free_vport;
155 if (netdev_vport->dev->flags & IFF_LOOPBACK ||
156 netdev_vport->dev->type != ARPHRD_ETHER ||
157 is_internal_dev(netdev_vport->dev)) {
162 if (netdev_vport->dev->br_port) {
170 dev_put(netdev_vport->dev);
178 netdev_destroy(struct vport *vport)
180 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
182 dev_put(netdev_vport->dev);
189 netdev_attach(struct vport *vport)
191 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
193 dev_set_promiscuity(netdev_vport->dev, 1);
194 dev_disable_lro(netdev_vport->dev);
195 rcu_assign_pointer(netdev_vport->dev->br_port, (struct net_bridge_port *)vport);
201 netdev_detach(struct vport *vport)
203 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
205 rcu_assign_pointer(netdev_vport->dev->br_port, NULL);
206 dev_set_promiscuity(netdev_vport->dev, -1);
212 netdev_set_mtu(struct vport *vport, int mtu)
214 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
215 return dev_set_mtu(netdev_vport->dev, mtu);
219 netdev_set_addr(struct vport *vport, const unsigned char *addr)
221 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
224 sa.sa_family = ARPHRD_ETHER;
225 memcpy(sa.sa_data, addr, ETH_ALEN);
227 return dev_set_mac_address(netdev_vport->dev, &sa);
231 netdev_get_name(const struct vport *vport)
233 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
234 return netdev_vport->dev->name;
237 const unsigned char *
238 netdev_get_addr(const struct vport *vport)
240 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
241 return netdev_vport->dev->dev_addr;
245 netdev_get_kobj(const struct vport *vport)
247 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
248 return &netdev_vport->dev->NETDEV_DEV_MEMBER.kobj;
252 netdev_get_stats(const struct vport *vport, struct odp_vport_stats *stats)
254 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
255 const struct net_device_stats *netdev_stats;
257 netdev_stats = dev_get_stats(netdev_vport->dev);
259 stats->rx_bytes = netdev_stats->rx_bytes;
260 stats->rx_packets = netdev_stats->rx_packets;
261 stats->tx_bytes = netdev_stats->tx_bytes;
262 stats->tx_packets = netdev_stats->tx_packets;
263 stats->rx_dropped = netdev_stats->rx_dropped;
264 stats->rx_errors = netdev_stats->rx_errors;
265 stats->rx_frame_err = netdev_stats->rx_frame_errors;
266 stats->rx_over_err = netdev_stats->rx_over_errors;
267 stats->rx_crc_err = netdev_stats->rx_crc_errors;
268 stats->tx_dropped = netdev_stats->tx_dropped;
269 stats->tx_errors = netdev_stats->tx_errors;
270 stats->collisions = netdev_stats->collisions;
276 netdev_get_dev_flags(const struct vport *vport)
278 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
279 return dev_get_flags(netdev_vport->dev);
283 netdev_is_running(const struct vport *vport)
285 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
286 return netif_running(netdev_vport->dev);
290 netdev_get_operstate(const struct vport *vport)
292 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
293 return netdev_vport->dev->operstate;
297 netdev_get_ifindex(const struct vport *vport)
299 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
300 return netdev_vport->dev->ifindex;
304 netdev_get_iflink(const struct vport *vport)
306 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
307 return netdev_vport->dev->iflink;
311 netdev_get_mtu(const struct vport *vport)
313 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
314 return netdev_vport->dev->mtu;
317 /* Must be called with rcu_read_lock. */
319 netdev_port_receive(struct net_bridge_port *p, struct sk_buff *skb)
321 struct vport *vport = (struct vport *)p;
323 /* Make our own copy of the packet. Otherwise we will mangle the
324 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
325 * (No one comes after us, since we tell handle_bridge() that we took
327 skb = skb_share_check(skb, GFP_ATOMIC);
331 /* Push the Ethernet header back on. */
332 skb_push(skb, ETH_HLEN);
333 skb_reset_mac_header(skb);
334 compute_ip_summed(skb, false);
336 vport_receive(vport, skb);
340 netdev_send(struct vport *vport, struct sk_buff *skb)
342 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
345 skb->dev = netdev_vport->dev;
346 forward_ip_summed(skb);
352 /* Returns null if this device is not attached to a datapath. */
354 netdev_get_vport(struct net_device *dev)
356 return (struct vport *)dev->br_port;
359 struct vport_ops netdev_vport_ops = {
361 .flags = VPORT_F_REQUIRED,
364 .create = netdev_create,
365 .destroy = netdev_destroy,
366 .attach = netdev_attach,
367 .detach = netdev_detach,
368 .set_mtu = netdev_set_mtu,
369 .set_addr = netdev_set_addr,
370 .get_name = netdev_get_name,
371 .get_addr = netdev_get_addr,
372 .get_kobj = netdev_get_kobj,
373 .get_stats = netdev_get_stats,
374 .get_dev_flags = netdev_get_dev_flags,
375 .is_running = netdev_is_running,
376 .get_operstate = netdev_get_operstate,
377 .get_ifindex = netdev_get_ifindex,
378 .get_iflink = netdev_get_iflink,
379 .get_mtu = netdev_get_mtu,