Commit | Line | Data |
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ccb1352e | 1 | /* |
caf2ee14 | 2 | * Copyright (c) 2007-2012 Nicira, Inc. |
ccb1352e JG |
3 | * |
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 | |
17 | */ | |
18 | ||
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
20 | ||
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> | |
2537b4dd | 28 | #include <linux/openvswitch.h> |
dcc38c03 | 29 | #include <linux/export.h> |
ccb1352e | 30 | |
614732ea TG |
31 | #include <net/ip_tunnels.h> |
32 | #include <net/rtnetlink.h> | |
ccb1352e JG |
33 | |
34 | #include "datapath.h" | |
614732ea | 35 | #include "vport.h" |
ccb1352e JG |
36 | #include "vport-internal_dev.h" |
37 | #include "vport-netdev.h" | |
38 | ||
62b9c8d0 TG |
39 | static struct vport_ops ovs_netdev_vport_ops; |
40 | ||
ccb1352e | 41 | /* Must be called with rcu_read_lock. */ |
8c876639 | 42 | static void netdev_port_receive(struct sk_buff *skb) |
ccb1352e | 43 | { |
8c876639 PS |
44 | struct vport *vport; |
45 | ||
46 | vport = ovs_netdev_get_vport(skb->dev); | |
d9d59089 JG |
47 | if (unlikely(!vport)) |
48 | goto error; | |
49 | ||
50 | if (unlikely(skb_warn_if_lro(skb))) | |
51 | goto error; | |
ccb1352e JG |
52 | |
53 | /* Make our own copy of the packet. Otherwise we will mangle the | |
54 | * packet for anyone who came before us (e.g. tcpdump via AF_PACKET). | |
d176ca2a | 55 | */ |
ccb1352e JG |
56 | skb = skb_share_check(skb, GFP_ATOMIC); |
57 | if (unlikely(!skb)) | |
58 | return; | |
59 | ||
60 | skb_push(skb, ETH_HLEN); | |
b34df5e8 | 61 | ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN); |
61adedf3 | 62 | ovs_vport_receive(vport, skb, skb_tunnel_info(skb)); |
d9d59089 | 63 | return; |
d9d59089 JG |
64 | error: |
65 | kfree_skb(skb); | |
ccb1352e JG |
66 | } |
67 | ||
68 | /* Called with rcu_read_lock and bottom-halves disabled. */ | |
69 | static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb) | |
70 | { | |
71 | struct sk_buff *skb = *pskb; | |
ccb1352e JG |
72 | |
73 | if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) | |
74 | return RX_HANDLER_PASS; | |
75 | ||
8c876639 | 76 | netdev_port_receive(skb); |
ccb1352e JG |
77 | return RX_HANDLER_CONSUMED; |
78 | } | |
79 | ||
12eb18f7 | 80 | static struct net_device *get_dpdev(const struct datapath *dp) |
2537b4dd JP |
81 | { |
82 | struct vport *local; | |
83 | ||
84 | local = ovs_vport_ovsl(dp, OVSP_LOCAL); | |
85 | BUG_ON(!local); | |
be4ace6e | 86 | return local->dev; |
2537b4dd JP |
87 | } |
88 | ||
dcc38c03 | 89 | struct vport *ovs_netdev_link(struct vport *vport, const char *name) |
ccb1352e | 90 | { |
ccb1352e JG |
91 | int err; |
92 | ||
be4ace6e TG |
93 | vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name); |
94 | if (!vport->dev) { | |
ccb1352e JG |
95 | err = -ENODEV; |
96 | goto error_free_vport; | |
97 | } | |
98 | ||
be4ace6e TG |
99 | if (vport->dev->flags & IFF_LOOPBACK || |
100 | vport->dev->type != ARPHRD_ETHER || | |
101 | ovs_is_internal_dev(vport->dev)) { | |
ccb1352e JG |
102 | err = -EINVAL; |
103 | goto error_put; | |
104 | } | |
105 | ||
8e4e1713 | 106 | rtnl_lock(); |
be4ace6e | 107 | err = netdev_master_upper_dev_link(vport->dev, |
2537b4dd JP |
108 | get_dpdev(vport->dp)); |
109 | if (err) | |
110 | goto error_unlock; | |
111 | ||
be4ace6e | 112 | err = netdev_rx_handler_register(vport->dev, netdev_frame_hook, |
ccb1352e JG |
113 | vport); |
114 | if (err) | |
2537b4dd | 115 | goto error_master_upper_dev_unlink; |
ccb1352e | 116 | |
be4ace6e TG |
117 | dev_disable_lro(vport->dev); |
118 | dev_set_promiscuity(vport->dev, 1); | |
119 | vport->dev->priv_flags |= IFF_OVS_DATAPATH; | |
8e4e1713 | 120 | rtnl_unlock(); |
ccb1352e JG |
121 | |
122 | return vport; | |
123 | ||
2537b4dd | 124 | error_master_upper_dev_unlink: |
be4ace6e | 125 | netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp)); |
8e4e1713 PS |
126 | error_unlock: |
127 | rtnl_unlock(); | |
ccb1352e | 128 | error_put: |
be4ace6e | 129 | dev_put(vport->dev); |
ccb1352e JG |
130 | error_free_vport: |
131 | ovs_vport_free(vport); | |
ccb1352e JG |
132 | return ERR_PTR(err); |
133 | } | |
dcc38c03 | 134 | EXPORT_SYMBOL_GPL(ovs_netdev_link); |
ccb1352e | 135 | |
be4ace6e TG |
136 | static struct vport *netdev_create(const struct vport_parms *parms) |
137 | { | |
138 | struct vport *vport; | |
139 | ||
140 | vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms); | |
141 | if (IS_ERR(vport)) | |
142 | return vport; | |
143 | ||
dcc38c03 | 144 | return ovs_netdev_link(vport, parms->name); |
be4ace6e TG |
145 | } |
146 | ||
a9020fde | 147 | static void vport_netdev_free(struct rcu_head *rcu) |
92eb1d47 | 148 | { |
be4ace6e | 149 | struct vport *vport = container_of(rcu, struct vport, rcu); |
92eb1d47 | 150 | |
614732ea TG |
151 | if (vport->dev) |
152 | dev_put(vport->dev); | |
be4ace6e | 153 | ovs_vport_free(vport); |
92eb1d47 JG |
154 | } |
155 | ||
b07c2651 | 156 | void ovs_netdev_detach_dev(struct vport *vport) |
ccb1352e | 157 | { |
b07c2651 | 158 | ASSERT_RTNL(); |
be4ace6e TG |
159 | vport->dev->priv_flags &= ~IFF_OVS_DATAPATH; |
160 | netdev_rx_handler_unregister(vport->dev); | |
161 | netdev_upper_dev_unlink(vport->dev, | |
162 | netdev_master_upper_dev_get(vport->dev)); | |
163 | dev_set_promiscuity(vport->dev, -1); | |
b07c2651 | 164 | } |
dcc38c03 | 165 | EXPORT_SYMBOL_GPL(ovs_netdev_detach_dev); |
b07c2651 AS |
166 | |
167 | static void netdev_destroy(struct vport *vport) | |
168 | { | |
b07c2651 | 169 | rtnl_lock(); |
be4ace6e | 170 | if (vport->dev->priv_flags & IFF_OVS_DATAPATH) |
b07c2651 | 171 | ovs_netdev_detach_dev(vport); |
8e4e1713 | 172 | rtnl_unlock(); |
ccb1352e | 173 | |
a9020fde | 174 | call_rcu(&vport->rcu, vport_netdev_free); |
ccb1352e JG |
175 | } |
176 | ||
a9020fde PS |
177 | void ovs_netdev_tunnel_destroy(struct vport *vport) |
178 | { | |
179 | rtnl_lock(); | |
180 | if (vport->dev->priv_flags & IFF_OVS_DATAPATH) | |
181 | ovs_netdev_detach_dev(vport); | |
182 | ||
13175303 PA |
183 | /* We can be invoked by both explicit vport deletion and |
184 | * underlying netdev deregistration; delete the link only | |
185 | * if it's not already shutting down. | |
186 | */ | |
187 | if (vport->dev->reg_state == NETREG_REGISTERED) | |
188 | rtnl_delete_link(vport->dev); | |
a9020fde | 189 | dev_put(vport->dev); |
a9020fde PS |
190 | vport->dev = NULL; |
191 | rtnl_unlock(); | |
192 | ||
193 | call_rcu(&vport->rcu, vport_netdev_free); | |
194 | } | |
195 | EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy); | |
196 | ||
ccb1352e JG |
197 | /* Returns null if this device is not attached to a datapath. */ |
198 | struct vport *ovs_netdev_get_vport(struct net_device *dev) | |
199 | { | |
200 | if (likely(dev->priv_flags & IFF_OVS_DATAPATH)) | |
201 | return (struct vport *) | |
202 | rcu_dereference_rtnl(dev->rx_handler_data); | |
203 | else | |
204 | return NULL; | |
205 | } | |
206 | ||
62b9c8d0 | 207 | static struct vport_ops ovs_netdev_vport_ops = { |
ccb1352e JG |
208 | .type = OVS_VPORT_TYPE_NETDEV, |
209 | .create = netdev_create, | |
210 | .destroy = netdev_destroy, | |
aec15924 | 211 | .send = dev_queue_xmit, |
ccb1352e | 212 | }; |
62b9c8d0 TG |
213 | |
214 | int __init ovs_netdev_init(void) | |
215 | { | |
dcc38c03 | 216 | return ovs_vport_ops_register(&ovs_netdev_vport_ops); |
62b9c8d0 TG |
217 | } |
218 | ||
219 | void ovs_netdev_exit(void) | |
220 | { | |
221 | ovs_vport_ops_unregister(&ovs_netdev_vport_ops); | |
222 | } |