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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 JG |
41 | /* Must be called with rcu_read_lock. */ |
42 | static void netdev_port_receive(struct vport *vport, struct sk_buff *skb) | |
43 | { | |
d9d59089 JG |
44 | if (unlikely(!vport)) |
45 | goto error; | |
46 | ||
47 | if (unlikely(skb_warn_if_lro(skb))) | |
48 | goto error; | |
ccb1352e JG |
49 | |
50 | /* Make our own copy of the packet. Otherwise we will mangle the | |
51 | * packet for anyone who came before us (e.g. tcpdump via AF_PACKET). | |
d176ca2a | 52 | */ |
ccb1352e JG |
53 | skb = skb_share_check(skb, GFP_ATOMIC); |
54 | if (unlikely(!skb)) | |
55 | return; | |
56 | ||
57 | skb_push(skb, ETH_HLEN); | |
b34df5e8 PS |
58 | ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN); |
59 | ||
61adedf3 | 60 | ovs_vport_receive(vport, skb, skb_tunnel_info(skb)); |
d9d59089 JG |
61 | return; |
62 | ||
63 | error: | |
64 | kfree_skb(skb); | |
ccb1352e JG |
65 | } |
66 | ||
67 | /* Called with rcu_read_lock and bottom-halves disabled. */ | |
68 | static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb) | |
69 | { | |
70 | struct sk_buff *skb = *pskb; | |
71 | struct vport *vport; | |
72 | ||
73 | if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) | |
74 | return RX_HANDLER_PASS; | |
75 | ||
76 | vport = ovs_netdev_get_vport(skb->dev); | |
77 | ||
78 | netdev_port_receive(vport, skb); | |
79 | ||
80 | return RX_HANDLER_CONSUMED; | |
81 | } | |
82 | ||
12eb18f7 | 83 | static struct net_device *get_dpdev(const struct datapath *dp) |
2537b4dd JP |
84 | { |
85 | struct vport *local; | |
86 | ||
87 | local = ovs_vport_ovsl(dp, OVSP_LOCAL); | |
88 | BUG_ON(!local); | |
be4ace6e | 89 | return local->dev; |
2537b4dd JP |
90 | } |
91 | ||
dcc38c03 | 92 | struct vport *ovs_netdev_link(struct vport *vport, const char *name) |
ccb1352e | 93 | { |
ccb1352e JG |
94 | int err; |
95 | ||
be4ace6e TG |
96 | vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name); |
97 | if (!vport->dev) { | |
ccb1352e JG |
98 | err = -ENODEV; |
99 | goto error_free_vport; | |
100 | } | |
101 | ||
be4ace6e TG |
102 | if (vport->dev->flags & IFF_LOOPBACK || |
103 | vport->dev->type != ARPHRD_ETHER || | |
104 | ovs_is_internal_dev(vport->dev)) { | |
ccb1352e JG |
105 | err = -EINVAL; |
106 | goto error_put; | |
107 | } | |
108 | ||
8e4e1713 | 109 | rtnl_lock(); |
be4ace6e | 110 | err = netdev_master_upper_dev_link(vport->dev, |
2537b4dd JP |
111 | get_dpdev(vport->dp)); |
112 | if (err) | |
113 | goto error_unlock; | |
114 | ||
be4ace6e | 115 | err = netdev_rx_handler_register(vport->dev, netdev_frame_hook, |
ccb1352e JG |
116 | vport); |
117 | if (err) | |
2537b4dd | 118 | goto error_master_upper_dev_unlink; |
ccb1352e | 119 | |
be4ace6e TG |
120 | dev_disable_lro(vport->dev); |
121 | dev_set_promiscuity(vport->dev, 1); | |
122 | vport->dev->priv_flags |= IFF_OVS_DATAPATH; | |
8e4e1713 | 123 | rtnl_unlock(); |
ccb1352e JG |
124 | |
125 | return vport; | |
126 | ||
2537b4dd | 127 | error_master_upper_dev_unlink: |
be4ace6e | 128 | netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp)); |
8e4e1713 PS |
129 | error_unlock: |
130 | rtnl_unlock(); | |
ccb1352e | 131 | error_put: |
be4ace6e | 132 | dev_put(vport->dev); |
ccb1352e JG |
133 | error_free_vport: |
134 | ovs_vport_free(vport); | |
ccb1352e JG |
135 | return ERR_PTR(err); |
136 | } | |
dcc38c03 | 137 | EXPORT_SYMBOL_GPL(ovs_netdev_link); |
ccb1352e | 138 | |
be4ace6e TG |
139 | static struct vport *netdev_create(const struct vport_parms *parms) |
140 | { | |
141 | struct vport *vport; | |
142 | ||
143 | vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms); | |
144 | if (IS_ERR(vport)) | |
145 | return vport; | |
146 | ||
dcc38c03 | 147 | return ovs_netdev_link(vport, parms->name); |
be4ace6e TG |
148 | } |
149 | ||
a9020fde | 150 | static void vport_netdev_free(struct rcu_head *rcu) |
92eb1d47 | 151 | { |
be4ace6e | 152 | struct vport *vport = container_of(rcu, struct vport, rcu); |
92eb1d47 | 153 | |
614732ea TG |
154 | if (vport->dev) |
155 | dev_put(vport->dev); | |
be4ace6e | 156 | ovs_vport_free(vport); |
92eb1d47 JG |
157 | } |
158 | ||
b07c2651 | 159 | void ovs_netdev_detach_dev(struct vport *vport) |
ccb1352e | 160 | { |
b07c2651 | 161 | ASSERT_RTNL(); |
be4ace6e TG |
162 | vport->dev->priv_flags &= ~IFF_OVS_DATAPATH; |
163 | netdev_rx_handler_unregister(vport->dev); | |
164 | netdev_upper_dev_unlink(vport->dev, | |
165 | netdev_master_upper_dev_get(vport->dev)); | |
166 | dev_set_promiscuity(vport->dev, -1); | |
b07c2651 | 167 | } |
dcc38c03 | 168 | EXPORT_SYMBOL_GPL(ovs_netdev_detach_dev); |
b07c2651 AS |
169 | |
170 | static void netdev_destroy(struct vport *vport) | |
171 | { | |
b07c2651 | 172 | rtnl_lock(); |
be4ace6e | 173 | if (vport->dev->priv_flags & IFF_OVS_DATAPATH) |
b07c2651 | 174 | ovs_netdev_detach_dev(vport); |
8e4e1713 | 175 | rtnl_unlock(); |
ccb1352e | 176 | |
a9020fde | 177 | call_rcu(&vport->rcu, vport_netdev_free); |
ccb1352e JG |
178 | } |
179 | ||
a9020fde PS |
180 | void ovs_netdev_tunnel_destroy(struct vport *vport) |
181 | { | |
182 | rtnl_lock(); | |
183 | if (vport->dev->priv_flags & IFF_OVS_DATAPATH) | |
184 | ovs_netdev_detach_dev(vport); | |
185 | ||
186 | /* Early release so we can unregister the device */ | |
187 | dev_put(vport->dev); | |
188 | rtnl_delete_link(vport->dev); | |
189 | vport->dev = NULL; | |
190 | rtnl_unlock(); | |
191 | ||
192 | call_rcu(&vport->rcu, vport_netdev_free); | |
193 | } | |
194 | EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy); | |
195 | ||
95c96174 | 196 | static unsigned int packet_length(const struct sk_buff *skb) |
ccb1352e | 197 | { |
95c96174 | 198 | unsigned int length = skb->len - ETH_HLEN; |
ccb1352e JG |
199 | |
200 | if (skb->protocol == htons(ETH_P_8021Q)) | |
201 | length -= VLAN_HLEN; | |
202 | ||
203 | return length; | |
204 | } | |
205 | ||
dcc38c03 | 206 | int ovs_netdev_send(struct vport *vport, struct sk_buff *skb) |
ccb1352e | 207 | { |
be4ace6e | 208 | int mtu = vport->dev->mtu; |
ccb1352e JG |
209 | int len; |
210 | ||
211 | if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) { | |
e87cc472 | 212 | net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n", |
be4ace6e | 213 | vport->dev->name, |
e87cc472 | 214 | packet_length(skb), mtu); |
91b7514c | 215 | goto drop; |
ccb1352e JG |
216 | } |
217 | ||
be4ace6e | 218 | skb->dev = vport->dev; |
ccb1352e JG |
219 | len = skb->len; |
220 | dev_queue_xmit(skb); | |
221 | ||
222 | return len; | |
223 | ||
91b7514c | 224 | drop: |
ccb1352e | 225 | kfree_skb(skb); |
ccb1352e JG |
226 | return 0; |
227 | } | |
dcc38c03 | 228 | EXPORT_SYMBOL_GPL(ovs_netdev_send); |
ccb1352e JG |
229 | |
230 | /* Returns null if this device is not attached to a datapath. */ | |
231 | struct vport *ovs_netdev_get_vport(struct net_device *dev) | |
232 | { | |
233 | if (likely(dev->priv_flags & IFF_OVS_DATAPATH)) | |
234 | return (struct vport *) | |
235 | rcu_dereference_rtnl(dev->rx_handler_data); | |
236 | else | |
237 | return NULL; | |
238 | } | |
239 | ||
62b9c8d0 | 240 | static struct vport_ops ovs_netdev_vport_ops = { |
ccb1352e JG |
241 | .type = OVS_VPORT_TYPE_NETDEV, |
242 | .create = netdev_create, | |
243 | .destroy = netdev_destroy, | |
dcc38c03 | 244 | .send = ovs_netdev_send, |
ccb1352e | 245 | }; |
62b9c8d0 TG |
246 | |
247 | int __init ovs_netdev_init(void) | |
248 | { | |
dcc38c03 | 249 | return ovs_vport_ops_register(&ovs_netdev_vport_ops); |
62b9c8d0 TG |
250 | } |
251 | ||
252 | void ovs_netdev_exit(void) | |
253 | { | |
254 | ovs_vport_ops_unregister(&ovs_netdev_vport_ops); | |
255 | } |