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> | |
28 | ||
29 | #include <net/llc.h> | |
30 | ||
31 | #include "datapath.h" | |
32 | #include "vport-internal_dev.h" | |
33 | #include "vport-netdev.h" | |
34 | ||
35 | /* Must be called with rcu_read_lock. */ | |
36 | static void netdev_port_receive(struct vport *vport, struct sk_buff *skb) | |
37 | { | |
38 | if (unlikely(!vport)) { | |
39 | kfree_skb(skb); | |
40 | return; | |
41 | } | |
42 | ||
43 | /* Make our own copy of the packet. Otherwise we will mangle the | |
44 | * packet for anyone who came before us (e.g. tcpdump via AF_PACKET). | |
45 | * (No one comes after us, since we tell handle_bridge() that we took | |
46 | * the packet.) */ | |
47 | skb = skb_share_check(skb, GFP_ATOMIC); | |
48 | if (unlikely(!skb)) | |
49 | return; | |
50 | ||
51 | skb_push(skb, ETH_HLEN); | |
52 | ovs_vport_receive(vport, skb); | |
53 | } | |
54 | ||
55 | /* Called with rcu_read_lock and bottom-halves disabled. */ | |
56 | static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb) | |
57 | { | |
58 | struct sk_buff *skb = *pskb; | |
59 | struct vport *vport; | |
60 | ||
61 | if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) | |
62 | return RX_HANDLER_PASS; | |
63 | ||
64 | vport = ovs_netdev_get_vport(skb->dev); | |
65 | ||
66 | netdev_port_receive(vport, skb); | |
67 | ||
68 | return RX_HANDLER_CONSUMED; | |
69 | } | |
70 | ||
71 | static struct vport *netdev_create(const struct vport_parms *parms) | |
72 | { | |
73 | struct vport *vport; | |
74 | struct netdev_vport *netdev_vport; | |
75 | int err; | |
76 | ||
77 | vport = ovs_vport_alloc(sizeof(struct netdev_vport), | |
78 | &ovs_netdev_vport_ops, parms); | |
79 | if (IS_ERR(vport)) { | |
80 | err = PTR_ERR(vport); | |
81 | goto error; | |
82 | } | |
83 | ||
84 | netdev_vport = netdev_vport_priv(vport); | |
85 | ||
46df7b81 | 86 | netdev_vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), parms->name); |
ccb1352e JG |
87 | if (!netdev_vport->dev) { |
88 | err = -ENODEV; | |
89 | goto error_free_vport; | |
90 | } | |
91 | ||
92 | if (netdev_vport->dev->flags & IFF_LOOPBACK || | |
93 | netdev_vport->dev->type != ARPHRD_ETHER || | |
94 | ovs_is_internal_dev(netdev_vport->dev)) { | |
95 | err = -EINVAL; | |
96 | goto error_put; | |
97 | } | |
98 | ||
99 | err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook, | |
100 | vport); | |
101 | if (err) | |
102 | goto error_put; | |
103 | ||
104 | dev_set_promiscuity(netdev_vport->dev, 1); | |
105 | netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH; | |
106 | ||
107 | return vport; | |
108 | ||
109 | error_put: | |
110 | dev_put(netdev_vport->dev); | |
111 | error_free_vport: | |
112 | ovs_vport_free(vport); | |
113 | error: | |
114 | return ERR_PTR(err); | |
115 | } | |
116 | ||
92eb1d47 JG |
117 | static void free_port_rcu(struct rcu_head *rcu) |
118 | { | |
119 | struct netdev_vport *netdev_vport = container_of(rcu, | |
120 | struct netdev_vport, rcu); | |
121 | ||
122 | dev_put(netdev_vport->dev); | |
123 | ovs_vport_free(vport_from_priv(netdev_vport)); | |
124 | } | |
125 | ||
ccb1352e JG |
126 | static void netdev_destroy(struct vport *vport) |
127 | { | |
128 | struct netdev_vport *netdev_vport = netdev_vport_priv(vport); | |
129 | ||
130 | netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH; | |
131 | netdev_rx_handler_unregister(netdev_vport->dev); | |
132 | dev_set_promiscuity(netdev_vport->dev, -1); | |
133 | ||
92eb1d47 | 134 | call_rcu(&netdev_vport->rcu, free_port_rcu); |
ccb1352e JG |
135 | } |
136 | ||
137 | const char *ovs_netdev_get_name(const struct vport *vport) | |
138 | { | |
139 | const struct netdev_vport *netdev_vport = netdev_vport_priv(vport); | |
140 | return netdev_vport->dev->name; | |
141 | } | |
142 | ||
143 | int ovs_netdev_get_ifindex(const struct vport *vport) | |
144 | { | |
145 | const struct netdev_vport *netdev_vport = netdev_vport_priv(vport); | |
146 | return netdev_vport->dev->ifindex; | |
147 | } | |
148 | ||
95c96174 | 149 | static unsigned int packet_length(const struct sk_buff *skb) |
ccb1352e | 150 | { |
95c96174 | 151 | unsigned int length = skb->len - ETH_HLEN; |
ccb1352e JG |
152 | |
153 | if (skb->protocol == htons(ETH_P_8021Q)) | |
154 | length -= VLAN_HLEN; | |
155 | ||
156 | return length; | |
157 | } | |
158 | ||
159 | static int netdev_send(struct vport *vport, struct sk_buff *skb) | |
160 | { | |
161 | struct netdev_vport *netdev_vport = netdev_vport_priv(vport); | |
162 | int mtu = netdev_vport->dev->mtu; | |
163 | int len; | |
164 | ||
165 | if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) { | |
e87cc472 | 166 | net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n", |
c1c92b6a | 167 | netdev_vport->dev->name, |
e87cc472 | 168 | packet_length(skb), mtu); |
ccb1352e JG |
169 | goto error; |
170 | } | |
171 | ||
172 | if (unlikely(skb_warn_if_lro(skb))) | |
173 | goto error; | |
174 | ||
175 | skb->dev = netdev_vport->dev; | |
176 | len = skb->len; | |
177 | dev_queue_xmit(skb); | |
178 | ||
179 | return len; | |
180 | ||
181 | error: | |
182 | kfree_skb(skb); | |
183 | ovs_vport_record_error(vport, VPORT_E_TX_DROPPED); | |
184 | return 0; | |
185 | } | |
186 | ||
187 | /* Returns null if this device is not attached to a datapath. */ | |
188 | struct vport *ovs_netdev_get_vport(struct net_device *dev) | |
189 | { | |
190 | if (likely(dev->priv_flags & IFF_OVS_DATAPATH)) | |
191 | return (struct vport *) | |
192 | rcu_dereference_rtnl(dev->rx_handler_data); | |
193 | else | |
194 | return NULL; | |
195 | } | |
196 | ||
197 | const struct vport_ops ovs_netdev_vport_ops = { | |
198 | .type = OVS_VPORT_TYPE_NETDEV, | |
199 | .create = netdev_create, | |
200 | .destroy = netdev_destroy, | |
201 | .get_name = ovs_netdev_get_name, | |
202 | .get_ifindex = ovs_netdev_get_ifindex, | |
203 | .send = netdev_send, | |
204 | }; |