1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright (c) 2007-2012 Nicira, Inc. |
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> |
15 | #include <linux/openvswitch.h> |
16 | #include <linux/export.h> |
17 | |
18 | #include <net/ip_tunnels.h> |
19 | #include <net/rtnetlink.h> |
20 | |
21 | #include "datapath.h" |
22 | #include "vport.h" |
23 | #include "vport-internal_dev.h" |
24 | #include "vport-netdev.h" |
25 | |
26 | static struct vport_ops ovs_netdev_vport_ops; |
27 | |
28 | /* Must be called with rcu_read_lock. */ |
29 | static void netdev_port_receive(struct sk_buff *skb) |
30 | { |
31 | struct vport *vport; |
32 | |
33 | vport = ovs_netdev_get_vport(dev: skb->dev); |
34 | if (unlikely(!vport)) |
35 | goto error; |
36 | |
37 | if (unlikely(skb_warn_if_lro(skb))) |
38 | goto error; |
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). |
42 | */ |
43 | skb = skb_share_check(skb, GFP_ATOMIC); |
44 | if (unlikely(!skb)) |
45 | return; |
46 | |
47 | if (skb->dev->type == ARPHRD_ETHER) |
48 | skb_push_rcsum(skb, ETH_HLEN); |
49 | |
50 | ovs_vport_receive(vport, skb, skb_tunnel_info(skb)); |
51 | return; |
52 | error: |
53 | kfree_skb(skb); |
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; |
60 | |
61 | if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) |
62 | return RX_HANDLER_PASS; |
63 | |
64 | netdev_port_receive(skb); |
65 | return RX_HANDLER_CONSUMED; |
66 | } |
67 | |
68 | static struct net_device *get_dpdev(const struct datapath *dp) |
69 | { |
70 | struct vport *local; |
71 | |
72 | local = ovs_vport_ovsl(dp, OVSP_LOCAL); |
73 | return local->dev; |
74 | } |
75 | |
76 | struct vport *ovs_netdev_link(struct vport *vport, const char *name) |
77 | { |
78 | int err; |
79 | |
80 | vport->dev = dev_get_by_name(net: ovs_dp_get_net(dp: vport->dp), name); |
81 | if (!vport->dev) { |
82 | err = -ENODEV; |
83 | goto error_free_vport; |
84 | } |
85 | netdev_tracker_alloc(dev: vport->dev, tracker: &vport->dev_tracker, GFP_KERNEL); |
86 | if (vport->dev->flags & IFF_LOOPBACK || |
87 | (vport->dev->type != ARPHRD_ETHER && |
88 | vport->dev->type != ARPHRD_NONE) || |
89 | ovs_is_internal_dev(vport->dev)) { |
90 | err = -EINVAL; |
91 | goto error_put; |
92 | } |
93 | |
94 | rtnl_lock(); |
95 | err = netdev_master_upper_dev_link(dev: vport->dev, |
96 | upper_dev: get_dpdev(dp: vport->dp), |
97 | NULL, NULL, NULL); |
98 | if (err) |
99 | goto error_unlock; |
100 | |
101 | err = netdev_rx_handler_register(dev: vport->dev, rx_handler: netdev_frame_hook, |
102 | rx_handler_data: vport); |
103 | if (err) |
104 | goto error_master_upper_dev_unlink; |
105 | |
106 | dev_disable_lro(dev: vport->dev); |
107 | dev_set_promiscuity(dev: vport->dev, inc: 1); |
108 | vport->dev->priv_flags |= IFF_OVS_DATAPATH; |
109 | rtnl_unlock(); |
110 | |
111 | return vport; |
112 | |
113 | error_master_upper_dev_unlink: |
114 | netdev_upper_dev_unlink(dev: vport->dev, upper_dev: get_dpdev(dp: vport->dp)); |
115 | error_unlock: |
116 | rtnl_unlock(); |
117 | error_put: |
118 | netdev_put(dev: vport->dev, tracker: &vport->dev_tracker); |
119 | error_free_vport: |
120 | ovs_vport_free(vport); |
121 | return ERR_PTR(error: err); |
122 | } |
123 | EXPORT_SYMBOL_GPL(ovs_netdev_link); |
124 | |
125 | static struct vport *netdev_create(const struct vport_parms *parms) |
126 | { |
127 | struct vport *vport; |
128 | |
129 | vport = ovs_vport_alloc(priv_size: 0, &ovs_netdev_vport_ops, parms); |
130 | if (IS_ERR(ptr: vport)) |
131 | return vport; |
132 | |
133 | return ovs_netdev_link(vport, parms->name); |
134 | } |
135 | |
136 | static void vport_netdev_free(struct rcu_head *rcu) |
137 | { |
138 | struct vport *vport = container_of(rcu, struct vport, rcu); |
139 | |
140 | netdev_put(dev: vport->dev, tracker: &vport->dev_tracker); |
141 | ovs_vport_free(vport); |
142 | } |
143 | |
144 | void ovs_netdev_detach_dev(struct vport *vport) |
145 | { |
146 | ASSERT_RTNL(); |
147 | vport->dev->priv_flags &= ~IFF_OVS_DATAPATH; |
148 | netdev_rx_handler_unregister(dev: vport->dev); |
149 | netdev_upper_dev_unlink(dev: vport->dev, |
150 | upper_dev: netdev_master_upper_dev_get(dev: vport->dev)); |
151 | dev_set_promiscuity(dev: vport->dev, inc: -1); |
152 | } |
153 | |
154 | static void netdev_destroy(struct vport *vport) |
155 | { |
156 | rtnl_lock(); |
157 | if (netif_is_ovs_port(dev: vport->dev)) |
158 | ovs_netdev_detach_dev(vport); |
159 | rtnl_unlock(); |
160 | |
161 | call_rcu(head: &vport->rcu, func: vport_netdev_free); |
162 | } |
163 | |
164 | void ovs_netdev_tunnel_destroy(struct vport *vport) |
165 | { |
166 | rtnl_lock(); |
167 | if (netif_is_ovs_port(dev: vport->dev)) |
168 | ovs_netdev_detach_dev(vport); |
169 | |
170 | /* We can be invoked by both explicit vport deletion and |
171 | * underlying netdev deregistration; delete the link only |
172 | * if it's not already shutting down. |
173 | */ |
174 | if (vport->dev->reg_state == NETREG_REGISTERED) |
175 | rtnl_delete_link(dev: vport->dev, portid: 0, NULL); |
176 | netdev_put(dev: vport->dev, tracker: &vport->dev_tracker); |
177 | vport->dev = NULL; |
178 | rtnl_unlock(); |
179 | |
180 | call_rcu(head: &vport->rcu, func: vport_netdev_free); |
181 | } |
182 | EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy); |
183 | |
184 | /* Returns null if this device is not attached to a datapath. */ |
185 | struct vport *ovs_netdev_get_vport(struct net_device *dev) |
186 | { |
187 | if (likely(netif_is_ovs_port(dev))) |
188 | return (struct vport *) |
189 | rcu_dereference_rtnl(dev->rx_handler_data); |
190 | else |
191 | return NULL; |
192 | } |
193 | |
194 | static struct vport_ops ovs_netdev_vport_ops = { |
195 | .type = OVS_VPORT_TYPE_NETDEV, |
196 | .create = netdev_create, |
197 | .destroy = netdev_destroy, |
198 | .send = dev_queue_xmit, |
199 | }; |
200 | |
201 | int __init ovs_netdev_init(void) |
202 | { |
203 | return ovs_vport_ops_register(&ovs_netdev_vport_ops); |
204 | } |
205 | |
206 | void ovs_netdev_exit(void) |
207 | { |
208 | ovs_vport_ops_unregister(ops: &ovs_netdev_vport_ops); |
209 | } |
210 | |