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c9422999 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
ccb1352e | 2 | /* |
caf2ee14 | 3 | * Copyright (c) 2007-2012 Nicira, Inc. |
ccb1352e JG |
4 | */ |
5 | ||
6 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
7 | ||
8 | #include <linux/if_arp.h> | |
9 | #include <linux/if_bridge.h> | |
10 | #include <linux/if_vlan.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/llc.h> | |
13 | #include <linux/rtnetlink.h> | |
14 | #include <linux/skbuff.h> | |
2537b4dd | 15 | #include <linux/openvswitch.h> |
dcc38c03 | 16 | #include <linux/export.h> |
ccb1352e | 17 | |
614732ea TG |
18 | #include <net/ip_tunnels.h> |
19 | #include <net/rtnetlink.h> | |
ccb1352e JG |
20 | |
21 | #include "datapath.h" | |
614732ea | 22 | #include "vport.h" |
ccb1352e JG |
23 | #include "vport-internal_dev.h" |
24 | #include "vport-netdev.h" | |
25 | ||
62b9c8d0 TG |
26 | static struct vport_ops ovs_netdev_vport_ops; |
27 | ||
ccb1352e | 28 | /* Must be called with rcu_read_lock. */ |
8c876639 | 29 | static void netdev_port_receive(struct sk_buff *skb) |
ccb1352e | 30 | { |
8c876639 PS |
31 | struct vport *vport; |
32 | ||
33 | vport = ovs_netdev_get_vport(skb->dev); | |
d9d59089 JG |
34 | if (unlikely(!vport)) |
35 | goto error; | |
36 | ||
37 | if (unlikely(skb_warn_if_lro(skb))) | |
38 | goto error; | |
ccb1352e JG |
39 | |
40 | /* Make our own copy of the packet. Otherwise we will mangle the | |
41 | * packet for anyone who came before us (e.g. tcpdump via AF_PACKET). | |
d176ca2a | 42 | */ |
ccb1352e JG |
43 | skb = skb_share_check(skb, GFP_ATOMIC); |
44 | if (unlikely(!skb)) | |
45 | return; | |
46 | ||
7d42e84e CJ |
47 | if (skb->dev->type == ARPHRD_ETHER) |
48 | skb_push_rcsum(skb, ETH_HLEN); | |
49 | ||
61adedf3 | 50 | ovs_vport_receive(vport, skb, skb_tunnel_info(skb)); |
d9d59089 | 51 | return; |
d9d59089 JG |
52 | error: |
53 | kfree_skb(skb); | |
ccb1352e JG |
54 | } |
55 | ||
56 | /* Called with rcu_read_lock and bottom-halves disabled. */ | |
57 | static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb) | |
58 | { | |
59 | struct sk_buff *skb = *pskb; | |
ccb1352e JG |
60 | |
61 | if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) | |
62 | return RX_HANDLER_PASS; | |
63 | ||
8c876639 | 64 | netdev_port_receive(skb); |
ccb1352e JG |
65 | return RX_HANDLER_CONSUMED; |
66 | } | |
67 | ||
12eb18f7 | 68 | static struct net_device *get_dpdev(const struct datapath *dp) |
2537b4dd JP |
69 | { |
70 | struct vport *local; | |
71 | ||
72 | local = ovs_vport_ovsl(dp, OVSP_LOCAL); | |
be4ace6e | 73 | return local->dev; |
2537b4dd JP |
74 | } |
75 | ||
dcc38c03 | 76 | struct vport *ovs_netdev_link(struct vport *vport, const char *name) |
ccb1352e | 77 | { |
ccb1352e JG |
78 | int err; |
79 | ||
be4ace6e TG |
80 | vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name); |
81 | if (!vport->dev) { | |
ccb1352e JG |
82 | err = -ENODEV; |
83 | goto error_free_vport; | |
84 | } | |
85 | ||
be4ace6e | 86 | if (vport->dev->flags & IFF_LOOPBACK || |
217ac77a JB |
87 | (vport->dev->type != ARPHRD_ETHER && |
88 | vport->dev->type != ARPHRD_NONE) || | |
be4ace6e | 89 | ovs_is_internal_dev(vport->dev)) { |
ccb1352e JG |
90 | err = -EINVAL; |
91 | goto error_put; | |
92 | } | |
93 | ||
8e4e1713 | 94 | rtnl_lock(); |
be4ace6e | 95 | err = netdev_master_upper_dev_link(vport->dev, |
42ab19ee DA |
96 | get_dpdev(vport->dp), |
97 | NULL, NULL, NULL); | |
2537b4dd JP |
98 | if (err) |
99 | goto error_unlock; | |
100 | ||
be4ace6e | 101 | err = netdev_rx_handler_register(vport->dev, netdev_frame_hook, |
ccb1352e JG |
102 | vport); |
103 | if (err) | |
2537b4dd | 104 | goto error_master_upper_dev_unlink; |
ccb1352e | 105 | |
be4ace6e TG |
106 | dev_disable_lro(vport->dev); |
107 | dev_set_promiscuity(vport->dev, 1); | |
108 | vport->dev->priv_flags |= IFF_OVS_DATAPATH; | |
8e4e1713 | 109 | rtnl_unlock(); |
ccb1352e JG |
110 | |
111 | return vport; | |
112 | ||
2537b4dd | 113 | error_master_upper_dev_unlink: |
be4ace6e | 114 | netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp)); |
8e4e1713 PS |
115 | error_unlock: |
116 | rtnl_unlock(); | |
ccb1352e | 117 | error_put: |
be4ace6e | 118 | dev_put(vport->dev); |
ccb1352e JG |
119 | error_free_vport: |
120 | ovs_vport_free(vport); | |
ccb1352e JG |
121 | return ERR_PTR(err); |
122 | } | |
dcc38c03 | 123 | EXPORT_SYMBOL_GPL(ovs_netdev_link); |
ccb1352e | 124 | |
be4ace6e TG |
125 | static struct vport *netdev_create(const struct vport_parms *parms) |
126 | { | |
127 | struct vport *vport; | |
128 | ||
129 | vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms); | |
130 | if (IS_ERR(vport)) | |
131 | return vport; | |
132 | ||
dcc38c03 | 133 | return ovs_netdev_link(vport, parms->name); |
be4ace6e TG |
134 | } |
135 | ||
a9020fde | 136 | static void vport_netdev_free(struct rcu_head *rcu) |
92eb1d47 | 137 | { |
be4ace6e | 138 | struct vport *vport = container_of(rcu, struct vport, rcu); |
92eb1d47 | 139 | |
614732ea TG |
140 | if (vport->dev) |
141 | dev_put(vport->dev); | |
be4ace6e | 142 | ovs_vport_free(vport); |
92eb1d47 JG |
143 | } |
144 | ||
b07c2651 | 145 | void ovs_netdev_detach_dev(struct vport *vport) |
ccb1352e | 146 | { |
b07c2651 | 147 | ASSERT_RTNL(); |
be4ace6e TG |
148 | vport->dev->priv_flags &= ~IFF_OVS_DATAPATH; |
149 | netdev_rx_handler_unregister(vport->dev); | |
150 | netdev_upper_dev_unlink(vport->dev, | |
151 | netdev_master_upper_dev_get(vport->dev)); | |
152 | dev_set_promiscuity(vport->dev, -1); | |
b07c2651 AS |
153 | } |
154 | ||
155 | static void netdev_destroy(struct vport *vport) | |
156 | { | |
b07c2651 | 157 | rtnl_lock(); |
44e37259 | 158 | if (netif_is_ovs_port(vport->dev)) |
b07c2651 | 159 | ovs_netdev_detach_dev(vport); |
8e4e1713 | 160 | rtnl_unlock(); |
ccb1352e | 161 | |
a9020fde | 162 | call_rcu(&vport->rcu, vport_netdev_free); |
ccb1352e JG |
163 | } |
164 | ||
a9020fde PS |
165 | void ovs_netdev_tunnel_destroy(struct vport *vport) |
166 | { | |
167 | rtnl_lock(); | |
44e37259 | 168 | if (netif_is_ovs_port(vport->dev)) |
a9020fde PS |
169 | ovs_netdev_detach_dev(vport); |
170 | ||
13175303 PA |
171 | /* We can be invoked by both explicit vport deletion and |
172 | * underlying netdev deregistration; delete the link only | |
173 | * if it's not already shutting down. | |
174 | */ | |
175 | if (vport->dev->reg_state == NETREG_REGISTERED) | |
176 | rtnl_delete_link(vport->dev); | |
a9020fde | 177 | dev_put(vport->dev); |
a9020fde PS |
178 | vport->dev = NULL; |
179 | rtnl_unlock(); | |
180 | ||
181 | call_rcu(&vport->rcu, vport_netdev_free); | |
182 | } | |
183 | EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy); | |
184 | ||
ccb1352e JG |
185 | /* Returns null if this device is not attached to a datapath. */ |
186 | struct vport *ovs_netdev_get_vport(struct net_device *dev) | |
187 | { | |
44e37259 | 188 | if (likely(netif_is_ovs_port(dev))) |
ccb1352e JG |
189 | return (struct vport *) |
190 | rcu_dereference_rtnl(dev->rx_handler_data); | |
191 | else | |
192 | return NULL; | |
193 | } | |
194 | ||
62b9c8d0 | 195 | static struct vport_ops ovs_netdev_vport_ops = { |
ccb1352e JG |
196 | .type = OVS_VPORT_TYPE_NETDEV, |
197 | .create = netdev_create, | |
198 | .destroy = netdev_destroy, | |
aec15924 | 199 | .send = dev_queue_xmit, |
ccb1352e | 200 | }; |
62b9c8d0 TG |
201 | |
202 | int __init ovs_netdev_init(void) | |
203 | { | |
dcc38c03 | 204 | return ovs_vport_ops_register(&ovs_netdev_vport_ops); |
62b9c8d0 TG |
205 | } |
206 | ||
207 | void ovs_netdev_exit(void) | |
208 | { | |
209 | ovs_vport_ops_unregister(&ovs_netdev_vport_ops); | |
210 | } |