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>
34 #include "vport-internal_dev.h"
35 #include "vport-netdev.h"
37 static void netdev_port_receive(struct vport *vport, struct sk_buff *skb);
39 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
40 /* Called with rcu_read_lock and bottom-halves disabled. */
41 static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
43 struct sk_buff *skb = *pskb;
46 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
47 return RX_HANDLER_PASS;
49 vport = ovs_netdev_get_vport(skb->dev);
51 netdev_port_receive(vport, skb);
53 return RX_HANDLER_CONSUMED;
55 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36) || \
56 defined HAVE_RHEL_OVS_HOOK
57 /* Called with rcu_read_lock and bottom-halves disabled. */
58 static struct sk_buff *netdev_frame_hook(struct sk_buff *skb)
62 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
65 vport = ovs_netdev_get_vport(skb->dev);
67 netdev_port_receive(vport, skb);
71 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,32)
73 * Used as br_handle_frame_hook. (Cannot run bridge at the same time, even on
74 * different set of devices!)
76 /* Called with rcu_read_lock and bottom-halves disabled. */
77 static struct sk_buff *netdev_frame_hook(struct net_bridge_port *p,
80 netdev_port_receive((struct vport *)p, skb);
87 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36) || \
88 defined HAVE_RHEL_OVS_HOOK
89 static int netdev_init(void) { return 0; }
90 static void netdev_exit(void) { }
92 static int port_count;
94 static void netdev_init(void)
100 /* Hook into callback used by the bridge to intercept packets.
101 * Parasites we are. */
102 br_handle_frame_hook = netdev_frame_hook;
107 static void netdev_exit(void)
113 br_handle_frame_hook = NULL;
117 static struct net_device *get_dpdev(struct datapath *dp)
121 local = ovs_vport_ovsl(dp, OVSP_LOCAL);
123 return netdev_vport_priv(local)->dev;
126 static struct vport *netdev_create(const struct vport_parms *parms)
129 struct netdev_vport *netdev_vport;
132 vport = ovs_vport_alloc(sizeof(struct netdev_vport),
133 &ovs_netdev_vport_ops, parms);
135 err = PTR_ERR(vport);
139 netdev_vport = netdev_vport_priv(vport);
141 netdev_vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), parms->name);
142 if (!netdev_vport->dev) {
144 goto error_free_vport;
147 if (netdev_vport->dev->flags & IFF_LOOPBACK ||
148 netdev_vport->dev->type != ARPHRD_ETHER ||
149 ovs_is_internal_dev(netdev_vport->dev)) {
155 err = netdev_master_upper_dev_link(netdev_vport->dev,
156 get_dpdev(vport->dp));
160 err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook,
163 goto error_master_upper_dev_unlink;
165 dev_set_promiscuity(netdev_vport->dev, 1);
166 netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH;
172 error_master_upper_dev_unlink:
173 netdev_upper_dev_unlink(netdev_vport->dev, get_dpdev(vport->dp));
177 dev_put(netdev_vport->dev);
179 ovs_vport_free(vport);
184 static void free_port_rcu(struct rcu_head *rcu)
186 struct netdev_vport *netdev_vport = container_of(rcu,
187 struct netdev_vport, rcu);
189 dev_put(netdev_vport->dev);
190 ovs_vport_free(vport_from_priv(netdev_vport));
193 static void netdev_destroy(struct vport *vport)
195 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
199 netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
200 netdev_rx_handler_unregister(netdev_vport->dev);
201 netdev_upper_dev_unlink(netdev_vport->dev, get_dpdev(vport->dp));
202 dev_set_promiscuity(netdev_vport->dev, -1);
205 call_rcu(&netdev_vport->rcu, free_port_rcu);
208 const char *ovs_netdev_get_name(const struct vport *vport)
210 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
211 return netdev_vport->dev->name;
214 /* Must be called with rcu_read_lock. */
215 static void netdev_port_receive(struct vport *vport, struct sk_buff *skb)
217 if (unlikely(!vport))
220 if (unlikely(skb_warn_if_lro(skb)))
223 /* Make our own copy of the packet. Otherwise we will mangle the
224 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
225 * (No one comes after us, since we tell handle_bridge() that we took
227 skb = skb_share_check(skb, GFP_ATOMIC);
231 skb_push(skb, ETH_HLEN);
232 ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
234 ovs_vport_receive(vport, skb, NULL);
241 static unsigned int packet_length(const struct sk_buff *skb)
243 unsigned int length = skb->len - ETH_HLEN;
245 if (skb->protocol == htons(ETH_P_8021Q))
251 static int netdev_send(struct vport *vport, struct sk_buff *skb)
253 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
254 int mtu = netdev_vport->dev->mtu;
257 if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) {
258 net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
259 netdev_vport->dev->name,
260 packet_length(skb), mtu);
264 skb->dev = netdev_vport->dev;
275 /* Returns null if this device is not attached to a datapath. */
276 struct vport *ovs_netdev_get_vport(struct net_device *dev)
278 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36) || \
279 defined HAVE_RHEL_OVS_HOOK
280 #if IFF_OVS_DATAPATH != 0
281 if (likely(dev->priv_flags & IFF_OVS_DATAPATH))
283 if (likely(rcu_access_pointer(dev->rx_handler) == netdev_frame_hook))
285 #ifdef HAVE_RHEL_OVS_HOOK
286 return (struct vport *)rcu_dereference_rtnl(dev->ax25_ptr);
288 return (struct vport *)rcu_dereference_rtnl(dev->rx_handler_data);
293 return (struct vport *)rcu_dereference_rtnl(dev->br_port);
297 const struct vport_ops ovs_netdev_vport_ops = {
298 .type = OVS_VPORT_TYPE_NETDEV,
299 .create = netdev_create,
300 .destroy = netdev_destroy,
301 .get_name = ovs_netdev_get_name,
305 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) && \
306 !defined HAVE_RHEL_OVS_HOOK
308 * Enforces, mutual exclusion with the Linux bridge module, by declaring and
309 * exporting br_should_route_hook. Because the bridge module also exports the
310 * same symbol, the module loader will refuse to load both modules at the same
311 * time (e.g. "bridge: exports duplicate symbol br_should_route_hook (owned by
314 * Before Linux 2.6.36, Open vSwitch cannot safely coexist with the Linux
315 * bridge module, so openvswitch uses this macro in those versions. In
316 * Linux 2.6.36 and later, Open vSwitch can coexist with the bridge module.
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);