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
,