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 | ||
36 | /* Must be called with rcu_read_lock. */ | |
37 | static void netdev_port_receive(struct vport *vport, struct sk_buff *skb) | |
38 | { | |
d9d59089 JG |
39 | if (unlikely(!vport)) |
40 | goto error; | |
41 | ||
42 | if (unlikely(skb_warn_if_lro(skb))) | |
43 | goto error; | |
ccb1352e JG |
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). | |
d176ca2a | 47 | */ |
ccb1352e JG |
48 | skb = skb_share_check(skb, GFP_ATOMIC); |
49 | if (unlikely(!skb)) | |
50 | return; | |
51 | ||
52 | skb_push(skb, ETH_HLEN); | |
b34df5e8 PS |
53 | ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN); |
54 | ||
7d5437c7 | 55 | ovs_vport_receive(vport, skb, NULL); |
d9d59089 JG |
56 | return; |
57 | ||
58 | error: | |
59 | kfree_skb(skb); | |
ccb1352e JG |
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 | ||
2537b4dd JP |
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 | ||
ccb1352e JG |
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 | ||
46df7b81 | 102 | netdev_vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), parms->name); |
ccb1352e JG |
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 | ||
8e4e1713 | 115 | rtnl_lock(); |
2537b4dd JP |
116 | err = netdev_master_upper_dev_link(netdev_vport->dev, |
117 | get_dpdev(vport->dp)); | |
118 | if (err) | |
119 | goto error_unlock; | |
120 | ||
ccb1352e JG |
121 | err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook, |
122 | vport); | |
123 | if (err) | |
2537b4dd | 124 | goto error_master_upper_dev_unlink; |
ccb1352e JG |
125 | |
126 | dev_set_promiscuity(netdev_vport->dev, 1); | |
127 | netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH; | |
8e4e1713 | 128 | rtnl_unlock(); |
ccb1352e JG |
129 | |
130 | return vport; | |
131 | ||
2537b4dd JP |
132 | error_master_upper_dev_unlink: |
133 | netdev_upper_dev_unlink(netdev_vport->dev, get_dpdev(vport->dp)); | |
8e4e1713 PS |
134 | error_unlock: |
135 | rtnl_unlock(); | |
ccb1352e JG |
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 | ||
92eb1d47 JG |
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 | ||
ccb1352e JG |
153 | static void netdev_destroy(struct vport *vport) |
154 | { | |
155 | struct netdev_vport *netdev_vport = netdev_vport_priv(vport); | |
156 | ||
8e4e1713 | 157 | rtnl_lock(); |
ccb1352e JG |
158 | netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH; |
159 | netdev_rx_handler_unregister(netdev_vport->dev); | |
2537b4dd | 160 | netdev_upper_dev_unlink(netdev_vport->dev, get_dpdev(vport->dp)); |
ccb1352e | 161 | dev_set_promiscuity(netdev_vport->dev, -1); |
8e4e1713 | 162 | rtnl_unlock(); |
ccb1352e | 163 | |
92eb1d47 | 164 | call_rcu(&netdev_vport->rcu, free_port_rcu); |
ccb1352e JG |
165 | } |
166 | ||
167 | const char *ovs_netdev_get_name(const struct vport *vport) | |
168 | { | |
169 | const struct netdev_vport *netdev_vport = netdev_vport_priv(vport); | |
170 | return netdev_vport->dev->name; | |
171 | } | |
172 | ||
95c96174 | 173 | static unsigned int packet_length(const struct sk_buff *skb) |
ccb1352e | 174 | { |
95c96174 | 175 | unsigned int length = skb->len - ETH_HLEN; |
ccb1352e JG |
176 | |
177 | if (skb->protocol == htons(ETH_P_8021Q)) | |
178 | length -= VLAN_HLEN; | |
179 | ||
180 | return length; | |
181 | } | |
182 | ||
183 | static int netdev_send(struct vport *vport, struct sk_buff *skb) | |
184 | { | |
185 | struct netdev_vport *netdev_vport = netdev_vport_priv(vport); | |
186 | int mtu = netdev_vport->dev->mtu; | |
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", |
c1c92b6a | 191 | netdev_vport->dev->name, |
e87cc472 | 192 | packet_length(skb), mtu); |
91b7514c | 193 | goto drop; |
ccb1352e JG |
194 | } |
195 | ||
ccb1352e JG |
196 | skb->dev = netdev_vport->dev; |
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 | ||
217 | const struct vport_ops ovs_netdev_vport_ops = { | |
218 | .type = OVS_VPORT_TYPE_NETDEV, | |
219 | .create = netdev_create, | |
220 | .destroy = netdev_destroy, | |
221 | .get_name = ovs_netdev_get_name, | |
ccb1352e JG |
222 | .send = netdev_send, |
223 | }; |