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>
32 #include "vport-internal_dev.h"
33 #include "vport-netdev.h"
35 /* Must be called with rcu_read_lock. */
36 static void netdev_port_receive(struct vport *vport, struct sk_buff *skb)
41 if (unlikely(skb_warn_if_lro(skb)))
44 /* Make our own copy of the packet. Otherwise we will mangle the
45 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
47 skb = skb_share_check(skb, GFP_ATOMIC);
51 skb_push(skb, ETH_HLEN);
52 ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
54 ovs_vport_receive(vport, skb, NULL);
61 /* Called with rcu_read_lock and bottom-halves disabled. */
62 static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
64 struct sk_buff *skb = *pskb;
67 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
68 return RX_HANDLER_PASS;
70 vport = ovs_netdev_get_vport(skb->dev);
72 netdev_port_receive(vport, skb);
74 return RX_HANDLER_CONSUMED;
77 static struct vport *netdev_create(const struct vport_parms *parms)
80 struct netdev_vport *netdev_vport;
83 vport = ovs_vport_alloc(sizeof(struct netdev_vport),
84 &ovs_netdev_vport_ops, parms);
90 netdev_vport = netdev_vport_priv(vport);
92 netdev_vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), parms->name);
93 if (!netdev_vport->dev) {
95 goto error_free_vport;
98 if (netdev_vport->dev->flags & IFF_LOOPBACK ||
99 netdev_vport->dev->type != ARPHRD_ETHER ||
100 ovs_is_internal_dev(netdev_vport->dev)) {
106 err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook,
111 dev_set_promiscuity(netdev_vport->dev, 1);
112 netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH;
120 dev_put(netdev_vport->dev);
122 ovs_vport_free(vport);
127 static void free_port_rcu(struct rcu_head *rcu)
129 struct netdev_vport *netdev_vport = container_of(rcu,
130 struct netdev_vport, rcu);
132 dev_put(netdev_vport->dev);
133 ovs_vport_free(vport_from_priv(netdev_vport));
136 static void netdev_destroy(struct vport *vport)
138 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
141 netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
142 netdev_rx_handler_unregister(netdev_vport->dev);
143 dev_set_promiscuity(netdev_vport->dev, -1);
146 call_rcu(&netdev_vport->rcu, free_port_rcu);
149 const char *ovs_netdev_get_name(const struct vport *vport)
151 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
152 return netdev_vport->dev->name;
155 static unsigned int packet_length(const struct sk_buff *skb)
157 unsigned int length = skb->len - ETH_HLEN;
159 if (skb->protocol == htons(ETH_P_8021Q))
165 static int netdev_send(struct vport *vport, struct sk_buff *skb)
167 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
168 int mtu = netdev_vport->dev->mtu;
171 if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) {
172 net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
173 netdev_vport->dev->name,
174 packet_length(skb), mtu);
178 skb->dev = netdev_vport->dev;
189 /* Returns null if this device is not attached to a datapath. */
190 struct vport *ovs_netdev_get_vport(struct net_device *dev)
192 if (likely(dev->priv_flags & IFF_OVS_DATAPATH))
193 return (struct vport *)
194 rcu_dereference_rtnl(dev->rx_handler_data);
199 const struct vport_ops ovs_netdev_vport_ops = {
200 .type = OVS_VPORT_TYPE_NETDEV,
201 .create = netdev_create,
202 .destroy = netdev_destroy,
203 .get_name = ovs_netdev_get_name,