2 * Copyright (c) 2007-2012 Nicira, Inc.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21 #include <linux/if_arp.h>
22 #include <linux/if_bridge.h>
23 #include <linux/if_vlan.h>
24 #include <linux/kernel.h>
25 #include <linux/llc.h>
26 #include <linux/rtnetlink.h>
27 #include <linux/skbuff.h>
28 #include <linux/openvswitch.h>
35 #include "vport-internal_dev.h"
36 #include "vport-netdev.h"
38 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37) && \
39 !defined(HAVE_VLAN_BUG_WORKAROUND)
40 #include <linux/module.h>
42 static int vlan_tso __read_mostly;
43 module_param(vlan_tso, int, 0644);
44 MODULE_PARM_DESC(vlan_tso, "Enable TSO for VLAN packets");
49 static void netdev_port_receive(struct vport *vport, struct sk_buff *skb);
51 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
52 /* Called with rcu_read_lock and bottom-halves disabled. */
53 static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
55 struct sk_buff *skb = *pskb;
58 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
59 return RX_HANDLER_PASS;
61 vport = ovs_netdev_get_vport(skb->dev);
63 netdev_port_receive(vport, skb);
65 return RX_HANDLER_CONSUMED;
67 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36) || \
68 defined HAVE_RHEL_OVS_HOOK
69 /* Called with rcu_read_lock and bottom-halves disabled. */
70 static struct sk_buff *netdev_frame_hook(struct sk_buff *skb)
74 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
77 vport = ovs_netdev_get_vport(skb->dev);
79 netdev_port_receive(vport, skb);
83 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
85 * Used as br_handle_frame_hook. (Cannot run bridge at the same time, even on
86 * different set of devices!)
88 /* Called with rcu_read_lock and bottom-halves disabled. */
89 static struct sk_buff *netdev_frame_hook(struct net_bridge_port *p,
92 netdev_port_receive((struct vport *)p, skb);
95 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
97 * Used as br_handle_frame_hook. (Cannot run bridge at the same time, even on
98 * different set of devices!)
100 /* Called with rcu_read_lock and bottom-halves disabled. */
101 static int netdev_frame_hook(struct net_bridge_port *p, struct sk_buff **pskb)
103 netdev_port_receive((struct vport *)p, *pskb);
110 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36) || \
111 defined HAVE_RHEL_OVS_HOOK
112 static int netdev_init(void) { return 0; }
113 static void netdev_exit(void) { }
115 static int port_count;
117 static void netdev_init(void)
123 /* Hook into callback used by the bridge to intercept packets.
124 * Parasites we are. */
125 br_handle_frame_hook = netdev_frame_hook;
130 static void netdev_exit(void)
136 br_handle_frame_hook = NULL;
140 static struct net_device *get_dpdev(struct datapath *dp)
144 local = ovs_vport_ovsl(dp, OVSP_LOCAL);
146 return netdev_vport_priv(local)->dev;
149 static struct vport *netdev_create(const struct vport_parms *parms)
152 struct netdev_vport *netdev_vport;
155 vport = ovs_vport_alloc(sizeof(struct netdev_vport),
156 &ovs_netdev_vport_ops, parms);
158 err = PTR_ERR(vport);
162 netdev_vport = netdev_vport_priv(vport);
164 netdev_vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), parms->name);
165 if (!netdev_vport->dev) {
167 goto error_free_vport;
170 if (netdev_vport->dev->flags & IFF_LOOPBACK ||
171 netdev_vport->dev->type != ARPHRD_ETHER ||
172 ovs_is_internal_dev(netdev_vport->dev)) {
178 err = netdev_master_upper_dev_link(netdev_vport->dev,
179 get_dpdev(vport->dp));
183 err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook,
186 goto error_master_upper_dev_unlink;
188 dev_set_promiscuity(netdev_vport->dev, 1);
189 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24)
190 dev_disable_lro(netdev_vport->dev);
192 netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH;
198 error_master_upper_dev_unlink:
199 netdev_upper_dev_unlink(netdev_vport->dev, get_dpdev(vport->dp));
203 dev_put(netdev_vport->dev);
205 ovs_vport_free(vport);
210 static void free_port_rcu(struct rcu_head *rcu)
212 struct netdev_vport *netdev_vport = container_of(rcu,
213 struct netdev_vport, rcu);
215 dev_put(netdev_vport->dev);
216 ovs_vport_free(vport_from_priv(netdev_vport));
219 static void netdev_destroy(struct vport *vport)
221 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
225 netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
226 netdev_rx_handler_unregister(netdev_vport->dev);
227 netdev_upper_dev_unlink(netdev_vport->dev, get_dpdev(vport->dp));
228 dev_set_promiscuity(netdev_vport->dev, -1);
231 call_rcu(&netdev_vport->rcu, free_port_rcu);
234 const char *ovs_netdev_get_name(const struct vport *vport)
236 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
237 return netdev_vport->dev->name;
240 /* Must be called with rcu_read_lock. */
241 static void netdev_port_receive(struct vport *vport, struct sk_buff *skb)
243 if (unlikely(!vport))
246 if (unlikely(skb_warn_if_lro(skb)))
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 if (unlikely(compute_ip_summed(skb, false)))
260 skb_push(skb, ETH_HLEN);
261 ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
263 vlan_copy_skb_tci(skb);
265 ovs_vport_receive(vport, skb, NULL);
272 static unsigned int packet_length(const struct sk_buff *skb)
274 unsigned int length = skb->len - ETH_HLEN;
276 if (skb->protocol == htons(ETH_P_8021Q))
282 static bool dev_supports_vlan_tx(struct net_device *dev)
284 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,37)
285 /* Software fallback means every device supports vlan_tci on TX. */
287 #elif defined(HAVE_VLAN_BUG_WORKAROUND)
288 return dev->features & NETIF_F_HW_VLAN_TX;
290 /* Assume that the driver is buggy. */
295 static int netdev_send(struct vport *vport, struct sk_buff *skb)
297 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
298 int mtu = netdev_vport->dev->mtu;
301 if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) {
302 net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
303 netdev_vport->dev->name,
304 packet_length(skb), mtu);
308 skb->dev = netdev_vport->dev;
309 forward_ip_summed(skb, true);
311 if (vlan_tx_tag_present(skb) && !dev_supports_vlan_tx(skb->dev)) {
314 features = netif_skb_features(skb);
317 features &= ~(NETIF_F_TSO | NETIF_F_TSO6 |
318 NETIF_F_UFO | NETIF_F_FSO);
320 if (netif_needs_gso(skb, features)) {
321 struct sk_buff *nskb;
323 nskb = skb_gso_segment(skb, features);
325 if (unlikely(skb_cloned(skb) &&
326 pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
329 skb_shinfo(skb)->gso_type &= ~SKB_GSO_DODGY;
343 skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
346 vlan_set_tci(skb, 0);
357 skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
360 vlan_set_tci(skb, 0);
373 /* Returns null if this device is not attached to a datapath. */
374 struct vport *ovs_netdev_get_vport(struct net_device *dev)
376 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36) || \
377 defined HAVE_RHEL_OVS_HOOK
378 #if IFF_OVS_DATAPATH != 0
379 if (likely(dev->priv_flags & IFF_OVS_DATAPATH))
381 if (likely(rcu_access_pointer(dev->rx_handler) == netdev_frame_hook))
383 #ifdef HAVE_RHEL_OVS_HOOK
384 return (struct vport *)rcu_dereference_rtnl(dev->ax25_ptr);
386 return (struct vport *)rcu_dereference_rtnl(dev->rx_handler_data);
391 return (struct vport *)rcu_dereference_rtnl(dev->br_port);
395 const struct vport_ops ovs_netdev_vport_ops = {
396 .type = OVS_VPORT_TYPE_NETDEV,
397 .create = netdev_create,
398 .destroy = netdev_destroy,
399 .get_name = ovs_netdev_get_name,
403 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) && \
404 !defined HAVE_RHEL_OVS_HOOK
406 * Enforces, mutual exclusion with the Linux bridge module, by declaring and
407 * exporting br_should_route_hook. Because the bridge module also exports the
408 * same symbol, the module loader will refuse to load both modules at the same
409 * time (e.g. "bridge: exports duplicate symbol br_should_route_hook (owned by
412 * Before Linux 2.6.36, Open vSwitch cannot safely coexist with the Linux
413 * bridge module, so openvswitch uses this macro in those versions. In
414 * Linux 2.6.36 and later, Open vSwitch can coexist with the bridge module.
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);