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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 | { | |
d9d59089 JG |
38 | if (unlikely(!vport)) |
39 | goto error; | |
40 | ||
41 | if (unlikely(skb_warn_if_lro(skb))) | |
42 | goto error; | |
ccb1352e JG |
43 | |
44 | /* Make our own copy of the packet. Otherwise we will mangle the | |
45 | * packet for anyone who came before us (e.g. tcpdump via AF_PACKET). | |
d176ca2a | 46 | */ |
ccb1352e JG |
47 | skb = skb_share_check(skb, GFP_ATOMIC); |
48 | if (unlikely(!skb)) | |
49 | return; | |
50 | ||
51 | skb_push(skb, ETH_HLEN); | |
b34df5e8 PS |
52 | ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN); |
53 | ||
ccb1352e | 54 | ovs_vport_receive(vport, skb); |
d9d59089 JG |
55 | return; |
56 | ||
57 | error: | |
58 | kfree_skb(skb); | |
ccb1352e JG |
59 | } |
60 | ||
61 | /* Called with rcu_read_lock and bottom-halves disabled. */ | |
62 | static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb) | |
63 | { | |
64 | struct sk_buff *skb = *pskb; | |
65 | struct vport *vport; | |
66 | ||
67 | if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) | |
68 | return RX_HANDLER_PASS; | |
69 | ||
70 | vport = ovs_netdev_get_vport(skb->dev); | |
71 | ||
72 | netdev_port_receive(vport, skb); | |
73 | ||
74 | return RX_HANDLER_CONSUMED; | |
75 | } | |
76 | ||
77 | static struct vport *netdev_create(const struct vport_parms *parms) | |
78 | { | |
79 | struct vport *vport; | |
80 | struct netdev_vport *netdev_vport; | |
81 | int err; | |
82 | ||
83 | vport = ovs_vport_alloc(sizeof(struct netdev_vport), | |
84 | &ovs_netdev_vport_ops, parms); | |
85 | if (IS_ERR(vport)) { | |
86 | err = PTR_ERR(vport); | |
87 | goto error; | |
88 | } | |
89 | ||
90 | netdev_vport = netdev_vport_priv(vport); | |
91 | ||
46df7b81 | 92 | netdev_vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), parms->name); |
ccb1352e JG |
93 | if (!netdev_vport->dev) { |
94 | err = -ENODEV; | |
95 | goto error_free_vport; | |
96 | } | |
97 | ||
98 | if (netdev_vport->dev->flags & IFF_LOOPBACK || | |
99 | netdev_vport->dev->type != ARPHRD_ETHER || | |
100 | ovs_is_internal_dev(netdev_vport->dev)) { | |
101 | err = -EINVAL; | |
102 | goto error_put; | |
103 | } | |
104 | ||
8e4e1713 | 105 | rtnl_lock(); |
ccb1352e JG |
106 | err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook, |
107 | vport); | |
108 | if (err) | |
8e4e1713 | 109 | goto error_unlock; |
ccb1352e JG |
110 | |
111 | dev_set_promiscuity(netdev_vport->dev, 1); | |
112 | netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH; | |
8e4e1713 | 113 | rtnl_unlock(); |
ccb1352e JG |
114 | |
115 | return vport; | |
116 | ||
8e4e1713 PS |
117 | error_unlock: |
118 | rtnl_unlock(); | |
ccb1352e JG |
119 | error_put: |
120 | dev_put(netdev_vport->dev); | |
121 | error_free_vport: | |
122 | ovs_vport_free(vport); | |
123 | error: | |
124 | return ERR_PTR(err); | |
125 | } | |
126 | ||
92eb1d47 JG |
127 | static void free_port_rcu(struct rcu_head *rcu) |
128 | { | |
129 | struct netdev_vport *netdev_vport = container_of(rcu, | |
130 | struct netdev_vport, rcu); | |
131 | ||
132 | dev_put(netdev_vport->dev); | |
133 | ovs_vport_free(vport_from_priv(netdev_vport)); | |
134 | } | |
135 | ||
ccb1352e JG |
136 | static void netdev_destroy(struct vport *vport) |
137 | { | |
138 | struct netdev_vport *netdev_vport = netdev_vport_priv(vport); | |
139 | ||
8e4e1713 | 140 | rtnl_lock(); |
ccb1352e JG |
141 | netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH; |
142 | netdev_rx_handler_unregister(netdev_vport->dev); | |
143 | dev_set_promiscuity(netdev_vport->dev, -1); | |
8e4e1713 | 144 | rtnl_unlock(); |
ccb1352e | 145 | |
92eb1d47 | 146 | call_rcu(&netdev_vport->rcu, free_port_rcu); |
ccb1352e JG |
147 | } |
148 | ||
149 | const char *ovs_netdev_get_name(const struct vport *vport) | |
150 | { | |
151 | const struct netdev_vport *netdev_vport = netdev_vport_priv(vport); | |
152 | return netdev_vport->dev->name; | |
153 | } | |
154 | ||
95c96174 | 155 | static unsigned int packet_length(const struct sk_buff *skb) |
ccb1352e | 156 | { |
95c96174 | 157 | unsigned int length = skb->len - ETH_HLEN; |
ccb1352e JG |
158 | |
159 | if (skb->protocol == htons(ETH_P_8021Q)) | |
160 | length -= VLAN_HLEN; | |
161 | ||
162 | return length; | |
163 | } | |
164 | ||
165 | static int netdev_send(struct vport *vport, struct sk_buff *skb) | |
166 | { | |
167 | struct netdev_vport *netdev_vport = netdev_vport_priv(vport); | |
168 | int mtu = netdev_vport->dev->mtu; | |
169 | int len; | |
170 | ||
171 | if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) { | |
e87cc472 | 172 | net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n", |
c1c92b6a | 173 | netdev_vport->dev->name, |
e87cc472 | 174 | packet_length(skb), mtu); |
91b7514c | 175 | goto drop; |
ccb1352e JG |
176 | } |
177 | ||
ccb1352e JG |
178 | skb->dev = netdev_vport->dev; |
179 | len = skb->len; | |
180 | dev_queue_xmit(skb); | |
181 | ||
182 | return len; | |
183 | ||
91b7514c | 184 | drop: |
ccb1352e | 185 | kfree_skb(skb); |
ccb1352e JG |
186 | return 0; |
187 | } | |
188 | ||
189 | /* Returns null if this device is not attached to a datapath. */ | |
190 | struct vport *ovs_netdev_get_vport(struct net_device *dev) | |
191 | { | |
192 | if (likely(dev->priv_flags & IFF_OVS_DATAPATH)) | |
193 | return (struct vport *) | |
194 | rcu_dereference_rtnl(dev->rx_handler_data); | |
195 | else | |
196 | return NULL; | |
197 | } | |
198 | ||
199 | const struct vport_ops ovs_netdev_vport_ops = { | |
200 | .type = OVS_VPORT_TYPE_NETDEV, | |
201 | .create = netdev_create, | |
202 | .destroy = netdev_destroy, | |
203 | .get_name = ovs_netdev_get_name, | |
ccb1352e JG |
204 | .send = netdev_send, |
205 | }; |