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> |
ccb1352e JG |
29 | |
30 | #include <net/llc.h> | |
31 | ||
32 | #include "datapath.h" | |
33 | #include "vport-internal_dev.h" | |
34 | #include "vport-netdev.h" | |
35 | ||
62b9c8d0 TG |
36 | static struct vport_ops ovs_netdev_vport_ops; |
37 | ||
ccb1352e JG |
38 | /* Must be called with rcu_read_lock. */ |
39 | static void netdev_port_receive(struct vport *vport, struct sk_buff *skb) | |
40 | { | |
d9d59089 JG |
41 | if (unlikely(!vport)) |
42 | goto error; | |
43 | ||
44 | if (unlikely(skb_warn_if_lro(skb))) | |
45 | goto error; | |
ccb1352e JG |
46 | |
47 | /* Make our own copy of the packet. Otherwise we will mangle the | |
48 | * packet for anyone who came before us (e.g. tcpdump via AF_PACKET). | |
d176ca2a | 49 | */ |
ccb1352e JG |
50 | skb = skb_share_check(skb, GFP_ATOMIC); |
51 | if (unlikely(!skb)) | |
52 | return; | |
53 | ||
54 | skb_push(skb, ETH_HLEN); | |
b34df5e8 PS |
55 | ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN); |
56 | ||
7d5437c7 | 57 | ovs_vport_receive(vport, skb, NULL); |
d9d59089 JG |
58 | return; |
59 | ||
60 | error: | |
61 | kfree_skb(skb); | |
ccb1352e JG |
62 | } |
63 | ||
64 | /* Called with rcu_read_lock and bottom-halves disabled. */ | |
65 | static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb) | |
66 | { | |
67 | struct sk_buff *skb = *pskb; | |
68 | struct vport *vport; | |
69 | ||
70 | if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) | |
71 | return RX_HANDLER_PASS; | |
72 | ||
73 | vport = ovs_netdev_get_vport(skb->dev); | |
74 | ||
75 | netdev_port_receive(vport, skb); | |
76 | ||
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 | ||
be4ace6e | 89 | static struct vport *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 | } | |
134 | ||
be4ace6e TG |
135 | static struct vport *netdev_create(const struct vport_parms *parms) |
136 | { | |
137 | struct vport *vport; | |
138 | ||
139 | vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms); | |
140 | if (IS_ERR(vport)) | |
141 | return vport; | |
142 | ||
143 | return netdev_link(vport, parms->name); | |
144 | } | |
145 | ||
92eb1d47 JG |
146 | static void free_port_rcu(struct rcu_head *rcu) |
147 | { | |
be4ace6e | 148 | struct vport *vport = container_of(rcu, struct vport, rcu); |
92eb1d47 | 149 | |
be4ace6e TG |
150 | dev_put(vport->dev); |
151 | ovs_vport_free(vport); | |
92eb1d47 JG |
152 | } |
153 | ||
b07c2651 | 154 | void ovs_netdev_detach_dev(struct vport *vport) |
ccb1352e | 155 | { |
b07c2651 | 156 | ASSERT_RTNL(); |
be4ace6e TG |
157 | vport->dev->priv_flags &= ~IFF_OVS_DATAPATH; |
158 | netdev_rx_handler_unregister(vport->dev); | |
159 | netdev_upper_dev_unlink(vport->dev, | |
160 | netdev_master_upper_dev_get(vport->dev)); | |
161 | dev_set_promiscuity(vport->dev, -1); | |
b07c2651 AS |
162 | } |
163 | ||
164 | static void netdev_destroy(struct vport *vport) | |
165 | { | |
b07c2651 | 166 | rtnl_lock(); |
be4ace6e | 167 | if (vport->dev->priv_flags & IFF_OVS_DATAPATH) |
b07c2651 | 168 | ovs_netdev_detach_dev(vport); |
8e4e1713 | 169 | rtnl_unlock(); |
ccb1352e | 170 | |
be4ace6e | 171 | call_rcu(&vport->rcu, free_port_rcu); |
ccb1352e JG |
172 | } |
173 | ||
95c96174 | 174 | static unsigned int packet_length(const struct sk_buff *skb) |
ccb1352e | 175 | { |
95c96174 | 176 | unsigned int length = skb->len - ETH_HLEN; |
ccb1352e JG |
177 | |
178 | if (skb->protocol == htons(ETH_P_8021Q)) | |
179 | length -= VLAN_HLEN; | |
180 | ||
181 | return length; | |
182 | } | |
183 | ||
184 | static int netdev_send(struct vport *vport, struct sk_buff *skb) | |
185 | { | |
be4ace6e | 186 | int mtu = vport->dev->mtu; |
ccb1352e JG |
187 | int len; |
188 | ||
189 | if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) { | |
e87cc472 | 190 | net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n", |
be4ace6e | 191 | vport->dev->name, |
e87cc472 | 192 | packet_length(skb), mtu); |
91b7514c | 193 | goto drop; |
ccb1352e JG |
194 | } |
195 | ||
be4ace6e | 196 | skb->dev = vport->dev; |
ccb1352e JG |
197 | len = skb->len; |
198 | dev_queue_xmit(skb); | |
199 | ||
200 | return len; | |
201 | ||
91b7514c | 202 | drop: |
ccb1352e | 203 | kfree_skb(skb); |
ccb1352e JG |
204 | return 0; |
205 | } | |
206 | ||
207 | /* Returns null if this device is not attached to a datapath. */ | |
208 | struct vport *ovs_netdev_get_vport(struct net_device *dev) | |
209 | { | |
210 | if (likely(dev->priv_flags & IFF_OVS_DATAPATH)) | |
211 | return (struct vport *) | |
212 | rcu_dereference_rtnl(dev->rx_handler_data); | |
213 | else | |
214 | return NULL; | |
215 | } | |
216 | ||
62b9c8d0 | 217 | static struct vport_ops ovs_netdev_vport_ops = { |
ccb1352e JG |
218 | .type = OVS_VPORT_TYPE_NETDEV, |
219 | .create = netdev_create, | |
220 | .destroy = netdev_destroy, | |
ccb1352e JG |
221 | .send = netdev_send, |
222 | }; | |
62b9c8d0 TG |
223 | |
224 | int __init ovs_netdev_init(void) | |
225 | { | |
226 | return ovs_vport_ops_register(&ovs_netdev_vport_ops); | |
227 | } | |
228 | ||
229 | void ovs_netdev_exit(void) | |
230 | { | |
231 | ovs_vport_ops_unregister(&ovs_netdev_vport_ops); | |
232 | } |