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); | |
86 | return netdev_vport_priv(local)->dev; | |
87 | } | |
88 | ||
ccb1352e JG |
89 | static struct vport *netdev_create(const struct vport_parms *parms) |
90 | { | |
91 | struct vport *vport; | |
92 | struct netdev_vport *netdev_vport; | |
93 | int err; | |
94 | ||
95 | vport = ovs_vport_alloc(sizeof(struct netdev_vport), | |
96 | &ovs_netdev_vport_ops, parms); | |
97 | if (IS_ERR(vport)) { | |
98 | err = PTR_ERR(vport); | |
99 | goto error; | |
100 | } | |
101 | ||
102 | netdev_vport = netdev_vport_priv(vport); | |
103 | ||
46df7b81 | 104 | netdev_vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), parms->name); |
ccb1352e JG |
105 | if (!netdev_vport->dev) { |
106 | err = -ENODEV; | |
107 | goto error_free_vport; | |
108 | } | |
109 | ||
110 | if (netdev_vport->dev->flags & IFF_LOOPBACK || | |
111 | netdev_vport->dev->type != ARPHRD_ETHER || | |
112 | ovs_is_internal_dev(netdev_vport->dev)) { | |
113 | err = -EINVAL; | |
114 | goto error_put; | |
115 | } | |
116 | ||
8e4e1713 | 117 | rtnl_lock(); |
2537b4dd JP |
118 | err = netdev_master_upper_dev_link(netdev_vport->dev, |
119 | get_dpdev(vport->dp)); | |
120 | if (err) | |
121 | goto error_unlock; | |
122 | ||
ccb1352e JG |
123 | err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook, |
124 | vport); | |
125 | if (err) | |
2537b4dd | 126 | goto error_master_upper_dev_unlink; |
ccb1352e JG |
127 | |
128 | dev_set_promiscuity(netdev_vport->dev, 1); | |
129 | netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH; | |
8e4e1713 | 130 | rtnl_unlock(); |
ccb1352e JG |
131 | |
132 | return vport; | |
133 | ||
2537b4dd JP |
134 | error_master_upper_dev_unlink: |
135 | netdev_upper_dev_unlink(netdev_vport->dev, get_dpdev(vport->dp)); | |
8e4e1713 PS |
136 | error_unlock: |
137 | rtnl_unlock(); | |
ccb1352e JG |
138 | error_put: |
139 | dev_put(netdev_vport->dev); | |
140 | error_free_vport: | |
141 | ovs_vport_free(vport); | |
142 | error: | |
143 | return ERR_PTR(err); | |
144 | } | |
145 | ||
92eb1d47 JG |
146 | static void free_port_rcu(struct rcu_head *rcu) |
147 | { | |
148 | struct netdev_vport *netdev_vport = container_of(rcu, | |
149 | struct netdev_vport, rcu); | |
150 | ||
151 | dev_put(netdev_vport->dev); | |
152 | ovs_vport_free(vport_from_priv(netdev_vport)); | |
153 | } | |
154 | ||
b07c2651 | 155 | void ovs_netdev_detach_dev(struct vport *vport) |
ccb1352e JG |
156 | { |
157 | struct netdev_vport *netdev_vport = netdev_vport_priv(vport); | |
158 | ||
b07c2651 | 159 | ASSERT_RTNL(); |
ccb1352e JG |
160 | netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH; |
161 | netdev_rx_handler_unregister(netdev_vport->dev); | |
b07c2651 AS |
162 | netdev_upper_dev_unlink(netdev_vport->dev, |
163 | netdev_master_upper_dev_get(netdev_vport->dev)); | |
ccb1352e | 164 | dev_set_promiscuity(netdev_vport->dev, -1); |
b07c2651 AS |
165 | } |
166 | ||
167 | static void netdev_destroy(struct vport *vport) | |
168 | { | |
169 | struct netdev_vport *netdev_vport = netdev_vport_priv(vport); | |
170 | ||
171 | rtnl_lock(); | |
172 | if (netdev_vport->dev->priv_flags & IFF_OVS_DATAPATH) | |
173 | ovs_netdev_detach_dev(vport); | |
8e4e1713 | 174 | rtnl_unlock(); |
ccb1352e | 175 | |
92eb1d47 | 176 | call_rcu(&netdev_vport->rcu, free_port_rcu); |
ccb1352e JG |
177 | } |
178 | ||
179 | const char *ovs_netdev_get_name(const struct vport *vport) | |
180 | { | |
181 | const struct netdev_vport *netdev_vport = netdev_vport_priv(vport); | |
182 | return netdev_vport->dev->name; | |
183 | } | |
184 | ||
95c96174 | 185 | static unsigned int packet_length(const struct sk_buff *skb) |
ccb1352e | 186 | { |
95c96174 | 187 | unsigned int length = skb->len - ETH_HLEN; |
ccb1352e JG |
188 | |
189 | if (skb->protocol == htons(ETH_P_8021Q)) | |
190 | length -= VLAN_HLEN; | |
191 | ||
192 | return length; | |
193 | } | |
194 | ||
195 | static int netdev_send(struct vport *vport, struct sk_buff *skb) | |
196 | { | |
197 | struct netdev_vport *netdev_vport = netdev_vport_priv(vport); | |
198 | int mtu = netdev_vport->dev->mtu; | |
199 | int len; | |
200 | ||
201 | if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) { | |
e87cc472 | 202 | net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n", |
c1c92b6a | 203 | netdev_vport->dev->name, |
e87cc472 | 204 | packet_length(skb), mtu); |
91b7514c | 205 | goto drop; |
ccb1352e JG |
206 | } |
207 | ||
ccb1352e JG |
208 | skb->dev = netdev_vport->dev; |
209 | len = skb->len; | |
210 | dev_queue_xmit(skb); | |
211 | ||
212 | return len; | |
213 | ||
91b7514c | 214 | drop: |
ccb1352e | 215 | kfree_skb(skb); |
ccb1352e JG |
216 | return 0; |
217 | } | |
218 | ||
219 | /* Returns null if this device is not attached to a datapath. */ | |
220 | struct vport *ovs_netdev_get_vport(struct net_device *dev) | |
221 | { | |
222 | if (likely(dev->priv_flags & IFF_OVS_DATAPATH)) | |
223 | return (struct vport *) | |
224 | rcu_dereference_rtnl(dev->rx_handler_data); | |
225 | else | |
226 | return NULL; | |
227 | } | |
228 | ||
62b9c8d0 | 229 | static struct vport_ops ovs_netdev_vport_ops = { |
ccb1352e JG |
230 | .type = OVS_VPORT_TYPE_NETDEV, |
231 | .create = netdev_create, | |
232 | .destroy = netdev_destroy, | |
233 | .get_name = ovs_netdev_get_name, | |
ccb1352e JG |
234 | .send = netdev_send, |
235 | }; | |
62b9c8d0 TG |
236 | |
237 | int __init ovs_netdev_init(void) | |
238 | { | |
239 | return ovs_vport_ops_register(&ovs_netdev_vport_ops); | |
240 | } | |
241 | ||
242 | void ovs_netdev_exit(void) | |
243 | { | |
244 | ovs_vport_ops_unregister(&ovs_netdev_vport_ops); | |
245 | } |