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1/*
2 * Copyright (c) 2007-2011 Nicira Networks.
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. */
36static 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. */
56static 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
71static 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
86 netdev_vport->dev = dev_get_by_name(&init_net, parms->name);
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
109error_put:
110 dev_put(netdev_vport->dev);
111error_free_vport:
112 ovs_vport_free(vport);
113error:
114 return ERR_PTR(err);
115}
116
117static void netdev_destroy(struct vport *vport)
118{
119 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
120
121 netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
122 netdev_rx_handler_unregister(netdev_vport->dev);
123 dev_set_promiscuity(netdev_vport->dev, -1);
124
125 synchronize_rcu();
126
127 dev_put(netdev_vport->dev);
128 ovs_vport_free(vport);
129}
130
131const char *ovs_netdev_get_name(const struct vport *vport)
132{
133 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
134 return netdev_vport->dev->name;
135}
136
137int ovs_netdev_get_ifindex(const struct vport *vport)
138{
139 const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
140 return netdev_vport->dev->ifindex;
141}
142
143static unsigned int packet_length(const struct sk_buff *skb)
144{
145 unsigned int length = skb->len - ETH_HLEN;
146
147 if (skb->protocol == htons(ETH_P_8021Q))
148 length -= VLAN_HLEN;
149
150 return length;
151}
152
153static int netdev_send(struct vport *vport, struct sk_buff *skb)
154{
155 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
156 int mtu = netdev_vport->dev->mtu;
157 int len;
158
159 if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) {
160 net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
161 ovs_dp_name(vport->dp),
162 packet_length(skb), mtu);
163 goto error;
164 }
165
166 if (unlikely(skb_warn_if_lro(skb)))
167 goto error;
168
169 skb->dev = netdev_vport->dev;
170 len = skb->len;
171 dev_queue_xmit(skb);
172
173 return len;
174
175error:
176 kfree_skb(skb);
177 ovs_vport_record_error(vport, VPORT_E_TX_DROPPED);
178 return 0;
179}
180
181/* Returns null if this device is not attached to a datapath. */
182struct vport *ovs_netdev_get_vport(struct net_device *dev)
183{
184 if (likely(dev->priv_flags & IFF_OVS_DATAPATH))
185 return (struct vport *)
186 rcu_dereference_rtnl(dev->rx_handler_data);
187 else
188 return NULL;
189}
190
191const struct vport_ops ovs_netdev_vport_ops = {
192 .type = OVS_VPORT_TYPE_NETDEV,
193 .create = netdev_create,
194 .destroy = netdev_destroy,
195 .get_name = ovs_netdev_get_name,
196 .get_ifindex = ovs_netdev_get_ifindex,
197 .send = netdev_send,
198};
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
26static struct vport_ops ovs_netdev_vport_ops;
27
28/* Must be called with rcu_read_lock. */
29static void netdev_port_receive(struct sk_buff *skb)
30{
31 struct vport *vport;
32
33 vport = ovs_netdev_get_vport(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(skb, ETH_HLEN);
49 skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
50 }
51 ovs_vport_receive(vport, skb, skb_tunnel_info(skb));
52 return;
53error:
54 kfree_skb(skb);
55}
56
57/* Called with rcu_read_lock and bottom-halves disabled. */
58static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
59{
60 struct sk_buff *skb = *pskb;
61
62 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
63 return RX_HANDLER_PASS;
64
65 netdev_port_receive(skb);
66 return RX_HANDLER_CONSUMED;
67}
68
69static struct net_device *get_dpdev(const struct datapath *dp)
70{
71 struct vport *local;
72
73 local = ovs_vport_ovsl(dp, OVSP_LOCAL);
74 return local->dev;
75}
76
77struct vport *ovs_netdev_link(struct vport *vport, const char *name)
78{
79 int err;
80
81 vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name);
82 if (!vport->dev) {
83 err = -ENODEV;
84 goto error_free_vport;
85 }
86
87 if (vport->dev->flags & IFF_LOOPBACK ||
88 (vport->dev->type != ARPHRD_ETHER &&
89 vport->dev->type != ARPHRD_NONE) ||
90 ovs_is_internal_dev(vport->dev)) {
91 err = -EINVAL;
92 goto error_put;
93 }
94
95 rtnl_lock();
96 err = netdev_master_upper_dev_link(vport->dev,
97 get_dpdev(vport->dp),
98 NULL, NULL, NULL);
99 if (err)
100 goto error_unlock;
101
102 err = netdev_rx_handler_register(vport->dev, netdev_frame_hook,
103 vport);
104 if (err)
105 goto error_master_upper_dev_unlink;
106
107 dev_disable_lro(vport->dev);
108 dev_set_promiscuity(vport->dev, 1);
109 vport->dev->priv_flags |= IFF_OVS_DATAPATH;
110 rtnl_unlock();
111
112 return vport;
113
114error_master_upper_dev_unlink:
115 netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp));
116error_unlock:
117 rtnl_unlock();
118error_put:
119 dev_put(vport->dev);
120error_free_vport:
121 ovs_vport_free(vport);
122 return ERR_PTR(err);
123}
124EXPORT_SYMBOL_GPL(ovs_netdev_link);
125
126static struct vport *netdev_create(const struct vport_parms *parms)
127{
128 struct vport *vport;
129
130 vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms);
131 if (IS_ERR(vport))
132 return vport;
133
134 return ovs_netdev_link(vport, parms->name);
135}
136
137static void vport_netdev_free(struct rcu_head *rcu)
138{
139 struct vport *vport = container_of(rcu, struct vport, rcu);
140
141 if (vport->dev)
142 dev_put(vport->dev);
143 ovs_vport_free(vport);
144}
145
146void ovs_netdev_detach_dev(struct vport *vport)
147{
148 ASSERT_RTNL();
149 vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
150 netdev_rx_handler_unregister(vport->dev);
151 netdev_upper_dev_unlink(vport->dev,
152 netdev_master_upper_dev_get(vport->dev));
153 dev_set_promiscuity(vport->dev, -1);
154}
155
156static void netdev_destroy(struct vport *vport)
157{
158 rtnl_lock();
159 if (netif_is_ovs_port(vport->dev))
160 ovs_netdev_detach_dev(vport);
161 rtnl_unlock();
162
163 call_rcu(&vport->rcu, vport_netdev_free);
164}
165
166void ovs_netdev_tunnel_destroy(struct vport *vport)
167{
168 rtnl_lock();
169 if (netif_is_ovs_port(vport->dev))
170 ovs_netdev_detach_dev(vport);
171
172 /* We can be invoked by both explicit vport deletion and
173 * underlying netdev deregistration; delete the link only
174 * if it's not already shutting down.
175 */
176 if (vport->dev->reg_state == NETREG_REGISTERED)
177 rtnl_delete_link(vport->dev);
178 dev_put(vport->dev);
179 vport->dev = NULL;
180 rtnl_unlock();
181
182 call_rcu(&vport->rcu, vport_netdev_free);
183}
184EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy);
185
186/* Returns null if this device is not attached to a datapath. */
187struct vport *ovs_netdev_get_vport(struct net_device *dev)
188{
189 if (likely(netif_is_ovs_port(dev)))
190 return (struct vport *)
191 rcu_dereference_rtnl(dev->rx_handler_data);
192 else
193 return NULL;
194}
195
196static struct vport_ops ovs_netdev_vport_ops = {
197 .type = OVS_VPORT_TYPE_NETDEV,
198 .create = netdev_create,
199 .destroy = netdev_destroy,
200 .send = dev_queue_xmit,
201};
202
203int __init ovs_netdev_init(void)
204{
205 return ovs_vport_ops_register(&ovs_netdev_vport_ops);
206}
207
208void ovs_netdev_exit(void)
209{
210 ovs_vport_ops_unregister(&ovs_netdev_vport_ops);
211}