2 * Copyright (c) 2010, 2011 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>
22 #include "vport-internal_dev.h"
23 #include "vport-netdev.h"
25 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37) && \
26 !defined(HAVE_VLAN_BUG_WORKAROUND)
27 #include <linux/module.h>
29 static int vlan_tso __read_mostly = 0;
30 module_param(vlan_tso, int, 0644);
31 MODULE_PARM_DESC(vlan_tso, "Enable TSO for VLAN packets");
36 /* If the native device stats aren't 64 bit use the vport stats tracking instead. */
37 #define USE_VPORT_STATS (sizeof(((struct net_device_stats *)0)->rx_bytes) < sizeof(u64))
39 static void netdev_port_receive(struct vport *vport, struct sk_buff *skb);
41 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
42 /* Called with rcu_read_lock and bottom-halves disabled. */
43 static struct sk_buff *netdev_frame_hook(struct sk_buff *skb)
47 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
50 vport = netdev_get_vport(skb->dev);
52 netdev_port_receive(vport, skb);
56 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
58 * Used as br_handle_frame_hook. (Cannot run bridge at the same time, even on
59 * different set of devices!)
61 /* Called with rcu_read_lock and bottom-halves disabled. */
62 static struct sk_buff *netdev_frame_hook(struct net_bridge_port *p,
65 netdev_port_receive((struct vport *)p, skb);
68 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
70 * Used as br_handle_frame_hook. (Cannot run bridge at the same time, even on
71 * different set of devices!)
73 /* Called with rcu_read_lock and bottom-halves disabled. */
74 static int netdev_frame_hook(struct net_bridge_port *p, struct sk_buff **pskb)
76 netdev_port_receive((struct vport *)p, *pskb);
83 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
84 static int netdev_init(void) { return 0; }
85 static void netdev_exit(void) { }
87 static int netdev_init(void)
89 /* Hook into callback used by the bridge to intercept packets.
90 * Parasites we are. */
91 br_handle_frame_hook = netdev_frame_hook;
96 static void netdev_exit(void)
98 br_handle_frame_hook = NULL;
102 static struct vport *netdev_create(const struct vport_parms *parms)
105 struct netdev_vport *netdev_vport;
108 vport = vport_alloc(sizeof(struct netdev_vport), &netdev_vport_ops, parms);
110 err = PTR_ERR(vport);
114 netdev_vport = netdev_vport_priv(vport);
116 netdev_vport->dev = dev_get_by_name(&init_net, parms->name);
117 if (!netdev_vport->dev) {
119 goto error_free_vport;
122 if (netdev_vport->dev->flags & IFF_LOOPBACK ||
123 netdev_vport->dev->type != ARPHRD_ETHER ||
124 is_internal_dev(netdev_vport->dev)) {
129 /* If we are using the vport stats layer initialize it to the current
130 * values so we are roughly consistent with the device stats. */
131 if (USE_VPORT_STATS) {
132 struct rtnl_link_stats64 stats;
134 err = netdev_get_stats(vport, &stats);
136 vport_set_stats(vport, &stats);
139 err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook,
144 dev_set_promiscuity(netdev_vport->dev, 1);
145 dev_disable_lro(netdev_vport->dev);
146 netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH;
151 dev_put(netdev_vport->dev);
158 static int netdev_destroy(struct vport *vport)
160 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
162 netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
163 netdev_rx_handler_unregister(netdev_vport->dev);
164 dev_set_promiscuity(netdev_vport->dev, -1);
168 dev_put(netdev_vport->dev);
174 int netdev_set_mtu(struct vport *vport, int mtu)
176 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
177 return dev_set_mtu(netdev_vport->dev, mtu);
180 int netdev_set_addr(struct vport *vport, const unsigned char *addr)
182 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
185 sa.sa_family = ARPHRD_ETHER;
186 memcpy(sa.sa_data, addr, ETH_ALEN);
188 return dev_set_mac_address(netdev_vport->dev, &sa);
191 const char *netdev_get_name(const struct vport *vport)
193 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
194 return netdev_vport->dev->name;
197 const unsigned char *netdev_get_addr(const struct vport *vport)
199 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
200 return netdev_vport->dev->dev_addr;
203 struct kobject *netdev_get_kobj(const struct vport *vport)
205 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
206 return &netdev_vport->dev->NETDEV_DEV_MEMBER.kobj;
209 int netdev_get_stats(const struct vport *vport, struct rtnl_link_stats64 *stats)
211 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
212 dev_get_stats(netdev_vport->dev, stats);
216 unsigned netdev_get_dev_flags(const struct vport *vport)
218 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
219 return dev_get_flags(netdev_vport->dev);
222 int netdev_is_running(const struct vport *vport)
224 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
225 return netif_running(netdev_vport->dev);
228 unsigned char netdev_get_operstate(const struct vport *vport)
230 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
231 return netdev_vport->dev->operstate;
234 int netdev_get_ifindex(const struct vport *vport)
236 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
237 return netdev_vport->dev->ifindex;
240 int netdev_get_iflink(const struct vport *vport)
242 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
243 return netdev_vport->dev->iflink;
246 int netdev_get_mtu(const struct vport *vport)
248 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
249 return netdev_vport->dev->mtu;
252 /* Must be called with rcu_read_lock. */
253 static void netdev_port_receive(struct vport *vport, struct sk_buff *skb)
255 /* Make our own copy of the packet. Otherwise we will mangle the
256 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
257 * (No one comes after us, since we tell handle_bridge() that we took
259 skb = skb_share_check(skb, GFP_ATOMIC);
263 skb_warn_if_lro(skb);
265 skb_push(skb, ETH_HLEN);
266 compute_ip_summed(skb, false);
267 vlan_copy_skb_tci(skb);
269 vport_receive(vport, skb);
272 static bool dev_supports_vlan_tx(struct net_device *dev)
274 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,37)
275 /* Software fallback means every device supports vlan_tci on TX. */
277 #elif defined(HAVE_VLAN_BUG_WORKAROUND)
278 return dev->features & NETIF_F_HW_VLAN_TX;
280 /* Assume that the driver is buggy. */
285 static int netdev_send(struct vport *vport, struct sk_buff *skb)
287 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
290 skb->dev = netdev_vport->dev;
291 forward_ip_summed(skb);
293 if (vlan_tx_tag_present(skb) && !dev_supports_vlan_tx(skb->dev)) {
297 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
298 features = skb->dev->features & skb->dev->vlan_features;
301 err = vswitch_skb_checksum_setup(skb);
308 features &= ~(NETIF_F_TSO | NETIF_F_TSO6 |
309 NETIF_F_UFO | NETIF_F_FSO);
311 if (skb_is_gso(skb) &&
312 (!skb_gso_ok(skb, features) ||
313 unlikely(skb->ip_summed != CHECKSUM_PARTIAL))) {
314 struct sk_buff *nskb;
316 nskb = skb_gso_segment(skb, features);
318 if (unlikely(skb_cloned(skb) &&
319 pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) {
324 skb_shinfo(skb)->gso_type &= ~SKB_GSO_DODGY;
338 skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
341 vlan_set_tci(skb, 0);
352 skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
355 vlan_set_tci(skb, 0);
364 /* Returns null if this device is not attached to a datapath. */
365 struct vport *netdev_get_vport(struct net_device *dev)
367 #ifdef IFF_BRIDGE_PORT
368 #if IFF_BRIDGE_PORT != IFF_OVS_DATAPATH
369 if (likely(dev->priv_flags & IFF_OVS_DATAPATH))
371 if (likely(rcu_access_pointer(dev->rx_handler) == netdev_frame_hook))
373 return (struct vport *)rcu_dereference_rtnl(dev->rx_handler_data);
377 return (struct vport *)rcu_dereference_rtnl(dev->br_port);
381 const struct vport_ops netdev_vport_ops = {
382 .type = ODP_VPORT_TYPE_NETDEV,
383 .flags = (VPORT_F_REQUIRED |
384 (USE_VPORT_STATS ? VPORT_F_GEN_STATS : 0)),
387 .create = netdev_create,
388 .destroy = netdev_destroy,
389 .set_mtu = netdev_set_mtu,
390 .set_addr = netdev_set_addr,
391 .get_name = netdev_get_name,
392 .get_addr = netdev_get_addr,
393 .get_kobj = netdev_get_kobj,
394 .get_stats = netdev_get_stats,
395 .get_dev_flags = netdev_get_dev_flags,
396 .is_running = netdev_is_running,
397 .get_operstate = netdev_get_operstate,
398 .get_ifindex = netdev_get_ifindex,
399 .get_iflink = netdev_get_iflink,
400 .get_mtu = netdev_get_mtu,
404 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
406 * In kernels earlier than 2.6.36, Open vSwitch cannot safely coexist with
407 * the Linux bridge module on any released version of Linux, because there
408 * is only a single bridge hook function and only a single br_port member
409 * in struct net_device.
411 * Declaring and exporting this symbol enforces mutual exclusion. The bridge
412 * module also exports the same symbol, so the module loader will refuse to
413 * load both modules at the same time (e.g. "bridge: exports duplicate symbol
414 * br_should_route_hook (owned by openvswitch_mod)").
416 * The use of "typeof" here avoids the need to track changes in the type of
417 * br_should_route_hook over various kernel versions.
419 typeof(br_should_route_hook) br_should_route_hook;
420 EXPORT_SYMBOL(br_should_route_hook);