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f2459fe7 | 1 | /* |
8063e095 | 2 | * Copyright (c) 2007-2012 Nicira, Inc. |
f2459fe7 | 3 | * |
a9a29d22 JG |
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. | |
7 | * | |
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. | |
12 | * | |
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 | |
16 | * 02110-1301, USA | |
f2459fe7 JG |
17 | */ |
18 | ||
24b019f8 JP |
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
20 | ||
f2459fe7 JG |
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> | |
2b51596f | 28 | #include <linux/openvswitch.h> |
8063e095 | 29 | #include <linux/export.h> |
f2459fe7 | 30 | |
e23775f2 PS |
31 | #include <net/ip_tunnels.h> |
32 | #include <net/rtnetlink.h> | |
f2459fe7 JG |
33 | |
34 | #include "datapath.h" | |
e23775f2 PS |
35 | #include "gso.h" |
36 | #include "vport.h" | |
f2459fe7 JG |
37 | #include "vport-internal_dev.h" |
38 | #include "vport-netdev.h" | |
39 | ||
5a38795f | 40 | static struct vport_ops ovs_netdev_vport_ops; |
e23775f2 PS |
41 | |
42 | /* Must be called with rcu_read_lock. */ | |
43 | void netdev_port_receive(struct sk_buff *skb, struct ip_tunnel_info *tun_info) | |
44 | { | |
45 | struct vport *vport; | |
46 | ||
47 | vport = ovs_netdev_get_vport(skb->dev); | |
48 | if (unlikely(!vport)) | |
49 | goto error; | |
50 | ||
51 | if (unlikely(skb_warn_if_lro(skb))) | |
52 | goto error; | |
53 | ||
54 | /* Make our own copy of the packet. Otherwise we will mangle the | |
55 | * packet for anyone who came before us (e.g. tcpdump via AF_PACKET). | |
56 | */ | |
57 | skb = skb_share_check(skb, GFP_ATOMIC); | |
58 | if (unlikely(!skb)) | |
59 | return; | |
60 | ||
61 | skb_push(skb, ETH_HLEN); | |
62 | ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN); | |
63 | ovs_vport_receive(vport, skb, tun_info); | |
64 | return; | |
65 | error: | |
66 | kfree_skb(skb); | |
67 | } | |
68 | ||
898ba403 AE |
69 | /* Called with rcu_read_lock and bottom-halves disabled. */ |
70 | static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb) | |
71 | { | |
72 | struct sk_buff *skb = *pskb; | |
898ba403 AE |
73 | |
74 | if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) | |
75 | return RX_HANDLER_PASS; | |
76 | ||
8063e095 PS |
77 | #ifndef HAVE_METADATA_DST |
78 | netdev_port_receive(skb, NULL); | |
f2459fe7 | 79 | #else |
8063e095 | 80 | netdev_port_receive(skb, skb_tunnel_info(skb)); |
f2459fe7 | 81 | #endif |
8063e095 PS |
82 | return RX_HANDLER_CONSUMED; |
83 | } | |
f2459fe7 | 84 | |
f1f60b85 | 85 | static struct net_device *get_dpdev(const struct datapath *dp) |
2b51596f JP |
86 | { |
87 | struct vport *local; | |
88 | ||
89 | local = ovs_vport_ovsl(dp, OVSP_LOCAL); | |
90 | BUG_ON(!local); | |
e23775f2 | 91 | return local->dev; |
2b51596f JP |
92 | } |
93 | ||
e23775f2 | 94 | struct vport *ovs_netdev_link(struct vport *vport, const char *name) |
f2459fe7 | 95 | { |
f2459fe7 JG |
96 | int err; |
97 | ||
e23775f2 PS |
98 | vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name); |
99 | if (!vport->dev) { | |
f2459fe7 JG |
100 | err = -ENODEV; |
101 | goto error_free_vport; | |
102 | } | |
103 | ||
e23775f2 PS |
104 | if (vport->dev->flags & IFF_LOOPBACK || |
105 | vport->dev->type != ARPHRD_ETHER || | |
106 | ovs_is_internal_dev(vport->dev)) { | |
f2459fe7 JG |
107 | err = -EINVAL; |
108 | goto error_put; | |
109 | } | |
110 | ||
cd2a59e9 | 111 | rtnl_lock(); |
e23775f2 | 112 | err = netdev_master_upper_dev_link(vport->dev, |
2b51596f JP |
113 | get_dpdev(vport->dp)); |
114 | if (err) | |
115 | goto error_unlock; | |
116 | ||
e23775f2 | 117 | err = netdev_rx_handler_register(vport->dev, netdev_frame_hook, |
7237e4f4 BP |
118 | vport); |
119 | if (err) | |
2b51596f | 120 | goto error_master_upper_dev_unlink; |
7237e4f4 | 121 | |
e23775f2 PS |
122 | dev_disable_lro(vport->dev); |
123 | dev_set_promiscuity(vport->dev, 1); | |
124 | vport->dev->priv_flags |= IFF_OVS_DATAPATH; | |
cd2a59e9 | 125 | rtnl_unlock(); |
7237e4f4 | 126 | |
f2459fe7 JG |
127 | return vport; |
128 | ||
2b51596f | 129 | error_master_upper_dev_unlink: |
e23775f2 | 130 | netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp)); |
cd2a59e9 PS |
131 | error_unlock: |
132 | rtnl_unlock(); | |
f2459fe7 | 133 | error_put: |
e23775f2 | 134 | dev_put(vport->dev); |
f2459fe7 | 135 | error_free_vport: |
850b6b3b | 136 | ovs_vport_free(vport); |
f2459fe7 JG |
137 | return ERR_PTR(err); |
138 | } | |
e23775f2 PS |
139 | EXPORT_SYMBOL_GPL(ovs_netdev_link); |
140 | ||
141 | static struct vport *netdev_create(const struct vport_parms *parms) | |
142 | { | |
143 | struct vport *vport; | |
144 | ||
145 | vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms); | |
146 | if (IS_ERR(vport)) | |
147 | return vport; | |
148 | ||
149 | return ovs_netdev_link(vport, parms->name); | |
150 | } | |
f2459fe7 | 151 | |
e23775f2 | 152 | static void vport_netdev_free(struct rcu_head *rcu) |
e65361d6 | 153 | { |
e23775f2 | 154 | struct vport *vport = container_of(rcu, struct vport, rcu); |
e65361d6 | 155 | |
e23775f2 PS |
156 | if (vport->dev) |
157 | dev_put(vport->dev); | |
158 | ovs_vport_free(vport); | |
e65361d6 JG |
159 | } |
160 | ||
8e04c6e1 | 161 | void ovs_netdev_detach_dev(struct vport *vport) |
f2459fe7 | 162 | { |
8e04c6e1 | 163 | ASSERT_RTNL(); |
e23775f2 PS |
164 | vport->dev->priv_flags &= ~IFF_OVS_DATAPATH; |
165 | netdev_rx_handler_unregister(vport->dev); | |
166 | netdev_upper_dev_unlink(vport->dev, | |
167 | netdev_master_upper_dev_get(vport->dev)); | |
168 | dev_set_promiscuity(vport->dev, -1); | |
8e04c6e1 | 169 | } |
e23775f2 | 170 | EXPORT_SYMBOL_GPL(ovs_netdev_detach_dev); |
8e04c6e1 AS |
171 | |
172 | static void netdev_destroy(struct vport *vport) | |
173 | { | |
8e04c6e1 | 174 | rtnl_lock(); |
e23775f2 | 175 | if (vport->dev->priv_flags & IFF_OVS_DATAPATH) |
8e04c6e1 | 176 | ovs_netdev_detach_dev(vport); |
cd2a59e9 | 177 | rtnl_unlock(); |
f2459fe7 | 178 | |
e23775f2 | 179 | call_rcu(&vport->rcu, vport_netdev_free); |
f2459fe7 JG |
180 | } |
181 | ||
e23775f2 | 182 | void ovs_netdev_tunnel_destroy(struct vport *vport) |
24b019f8 | 183 | { |
e23775f2 PS |
184 | rtnl_lock(); |
185 | if (vport->dev->priv_flags & IFF_OVS_DATAPATH) | |
186 | ovs_netdev_detach_dev(vport); | |
f2459fe7 | 187 | |
1e41fa16 PS |
188 | /* We can be invoked by both explicit vport deletion and |
189 | * underlying netdev deregistration; delete the link only | |
190 | * if it's not already shutting down. | |
191 | */ | |
1e41fa16 PS |
192 | if (vport->dev->reg_state == NETREG_REGISTERED) |
193 | rtnl_delete_link(vport->dev); | |
e23775f2 | 194 | dev_put(vport->dev); |
e23775f2 PS |
195 | vport->dev = NULL; |
196 | rtnl_unlock(); | |
24b019f8 | 197 | |
e23775f2 | 198 | call_rcu(&vport->rcu, vport_netdev_free); |
f2459fe7 | 199 | } |
e23775f2 | 200 | EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy); |
f2459fe7 JG |
201 | |
202 | /* Returns null if this device is not attached to a datapath. */ | |
850b6b3b | 203 | struct vport *ovs_netdev_get_vport(struct net_device *dev) |
f2459fe7 | 204 | { |
055dae4f | 205 | if (likely(dev->priv_flags & IFF_OVS_DATAPATH)) |
572e54fa | 206 | return (struct vport *) |
8063e095 | 207 | rcu_dereference_rtnl(dev->rx_handler_data); |
055dae4f | 208 | else |
37f055c7 | 209 | return NULL; |
f2459fe7 JG |
210 | } |
211 | ||
5a38795f | 212 | static struct vport_ops ovs_netdev_vport_ops = { |
df2c07f4 | 213 | .type = OVS_VPORT_TYPE_NETDEV, |
f2459fe7 JG |
214 | .create = netdev_create, |
215 | .destroy = netdev_destroy, | |
e23775f2 | 216 | .send = dev_queue_xmit, |
f2459fe7 | 217 | }; |
106eab5d | 218 | |
5a38795f TG |
219 | int __init ovs_netdev_init(void) |
220 | { | |
221 | return ovs_vport_ops_register(&ovs_netdev_vport_ops); | |
222 | } | |
223 | ||
224 | void ovs_netdev_exit(void) | |
225 | { | |
226 | ovs_vport_ops_unregister(&ovs_netdev_vport_ops); | |
227 | } |