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1 | /* |
2 | * Copyright (c) 2007-2012 Nicira, Inc. |
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> |
28 | #include <linux/openvswitch.h> |
29 | |
30 | #include <net/llc.h> |
31 | |
32 | #include "datapath.h" |
33 | #include "vport-internal_dev.h" |
34 | #include "vport-netdev.h" |
35 | |
36 | /* Must be called with rcu_read_lock. */ |
37 | static void netdev_port_receive(struct vport *vport, struct sk_buff *skb) |
38 | { |
39 | if (unlikely(!vport)) |
40 | goto error; |
41 | |
42 | if (unlikely(skb_warn_if_lro(skb))) |
43 | goto error; |
44 | |
45 | /* Make our own copy of the packet. Otherwise we will mangle the |
46 | * packet for anyone who came before us (e.g. tcpdump via AF_PACKET). |
47 | */ |
48 | skb = skb_share_check(skb, GFP_ATOMIC); |
49 | if (unlikely(!skb)) |
50 | return; |
51 | |
52 | skb_push(skb, ETH_HLEN); |
53 | ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN); |
54 | |
55 | ovs_vport_receive(vport, skb, NULL); |
56 | return; |
57 | |
58 | error: |
59 | kfree_skb(skb); |
60 | } |
61 | |
62 | /* Called with rcu_read_lock and bottom-halves disabled. */ |
63 | static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb) |
64 | { |
65 | struct sk_buff *skb = *pskb; |
66 | struct vport *vport; |
67 | |
68 | if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) |
69 | return RX_HANDLER_PASS; |
70 | |
71 | vport = ovs_netdev_get_vport(skb->dev); |
72 | |
73 | netdev_port_receive(vport, skb); |
74 | |
75 | return RX_HANDLER_CONSUMED; |
76 | } |
77 | |
78 | static struct net_device *get_dpdev(struct datapath *dp) |
79 | { |
80 | struct vport *local; |
81 | |
82 | local = ovs_vport_ovsl(dp, OVSP_LOCAL); |
83 | BUG_ON(!local); |
84 | return netdev_vport_priv(local)->dev; |
85 | } |
86 | |
87 | static struct vport *netdev_create(const struct vport_parms *parms) |
88 | { |
89 | struct vport *vport; |
90 | struct netdev_vport *netdev_vport; |
91 | int err; |
92 | |
93 | vport = ovs_vport_alloc(sizeof(struct netdev_vport), |
94 | &ovs_netdev_vport_ops, parms); |
95 | if (IS_ERR(vport)) { |
96 | err = PTR_ERR(vport); |
97 | goto error; |
98 | } |
99 | |
100 | netdev_vport = netdev_vport_priv(vport); |
101 | |
102 | netdev_vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), parms->name); |
103 | if (!netdev_vport->dev) { |
104 | err = -ENODEV; |
105 | goto error_free_vport; |
106 | } |
107 | |
108 | if (netdev_vport->dev->flags & IFF_LOOPBACK || |
109 | netdev_vport->dev->type != ARPHRD_ETHER || |
110 | ovs_is_internal_dev(netdev_vport->dev)) { |
111 | err = -EINVAL; |
112 | goto error_put; |
113 | } |
114 | |
115 | rtnl_lock(); |
116 | err = netdev_master_upper_dev_link(netdev_vport->dev, |
117 | get_dpdev(vport->dp)); |
118 | if (err) |
119 | goto error_unlock; |
120 | |
121 | err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook, |
122 | vport); |
123 | if (err) |
124 | goto error_master_upper_dev_unlink; |
125 | |
126 | dev_set_promiscuity(netdev_vport->dev, 1); |
127 | netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH; |
128 | rtnl_unlock(); |
129 | |
130 | return vport; |
131 | |
132 | error_master_upper_dev_unlink: |
133 | netdev_upper_dev_unlink(netdev_vport->dev, get_dpdev(vport->dp)); |
134 | error_unlock: |
135 | rtnl_unlock(); |
136 | error_put: |
137 | dev_put(netdev_vport->dev); |
138 | error_free_vport: |
139 | ovs_vport_free(vport); |
140 | error: |
141 | return ERR_PTR(err); |
142 | } |
143 | |
144 | static void free_port_rcu(struct rcu_head *rcu) |
145 | { |
146 | struct netdev_vport *netdev_vport = container_of(rcu, |
147 | struct netdev_vport, rcu); |
148 | |
149 | dev_put(netdev_vport->dev); |
150 | ovs_vport_free(vport_from_priv(netdev_vport)); |
151 | } |
152 | |
153 | void ovs_netdev_detach_dev(struct vport *vport) |
154 | { |
155 | struct netdev_vport *netdev_vport = netdev_vport_priv(vport); |
156 | |
157 | ASSERT_RTNL(); |
158 | netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH; |
159 | netdev_rx_handler_unregister(netdev_vport->dev); |
160 | netdev_upper_dev_unlink(netdev_vport->dev, |
161 | netdev_master_upper_dev_get(netdev_vport->dev)); |
162 | dev_set_promiscuity(netdev_vport->dev, -1); |
163 | } |
164 | |
165 | static void netdev_destroy(struct vport *vport) |
166 | { |
167 | struct netdev_vport *netdev_vport = netdev_vport_priv(vport); |
168 | |
169 | rtnl_lock(); |
170 | if (netdev_vport->dev->priv_flags & IFF_OVS_DATAPATH) |
171 | ovs_netdev_detach_dev(vport); |
172 | rtnl_unlock(); |
173 | |
174 | call_rcu(&netdev_vport->rcu, free_port_rcu); |
175 | } |
176 | |
177 | const char *ovs_netdev_get_name(const struct vport *vport) |
178 | { |
179 | const struct netdev_vport *netdev_vport = netdev_vport_priv(vport); |
180 | return netdev_vport->dev->name; |
181 | } |
182 | |
183 | static unsigned int packet_length(const struct sk_buff *skb) |
184 | { |
185 | unsigned int length = skb->len - ETH_HLEN; |
186 | |
187 | if (skb->protocol == htons(ETH_P_8021Q)) |
188 | length -= VLAN_HLEN; |
189 | |
190 | return length; |
191 | } |
192 | |
193 | static int netdev_send(struct vport *vport, struct sk_buff *skb) |
194 | { |
195 | struct netdev_vport *netdev_vport = netdev_vport_priv(vport); |
196 | int mtu = netdev_vport->dev->mtu; |
197 | int len; |
198 | |
199 | if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) { |
200 | net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n", |
201 | netdev_vport->dev->name, |
202 | packet_length(skb), mtu); |
203 | goto drop; |
204 | } |
205 | |
206 | skb->dev = netdev_vport->dev; |
207 | len = skb->len; |
208 | dev_queue_xmit(skb); |
209 | |
210 | return len; |
211 | |
212 | drop: |
213 | kfree_skb(skb); |
214 | return 0; |
215 | } |
216 | |
217 | /* Returns null if this device is not attached to a datapath. */ |
218 | struct vport *ovs_netdev_get_vport(struct net_device *dev) |
219 | { |
220 | if (likely(dev->priv_flags & IFF_OVS_DATAPATH)) |
221 | return (struct vport *) |
222 | rcu_dereference_rtnl(dev->rx_handler_data); |
223 | else |
224 | return NULL; |
225 | } |
226 | |
227 | const struct vport_ops ovs_netdev_vport_ops = { |
228 | .type = OVS_VPORT_TYPE_NETDEV, |
229 | .create = netdev_create, |
230 | .destroy = netdev_destroy, |
231 | .get_name = ovs_netdev_get_name, |
232 | .send = netdev_send, |
233 | }; |
234 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9