1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org).
4 *
5 * Transport usage:
6 * ethN=vde,<vde_switch>,<mac addr>,<port>,<group>,<mode>,<description>
7 *
8 */
9
10 #include <linux/init.h>
11 #include <linux/netdevice.h>
12 #include <net_kern.h>
13 #include <net_user.h>
14 #include "vde.h"
15
16 static void vde_init(struct net_device *dev, void *data)
17 {
18 struct vde_init *init = data;
19 struct uml_net_private *pri;
20 struct vde_data *vpri;
21
22 pri = netdev_priv(dev);
23 vpri = (struct vde_data *) pri->user;
24
25 vpri->vde_switch = init->vde_switch;
26 vpri->descr = init->descr ? init->descr : "UML vde_transport";
27 vpri->args = NULL;
28 vpri->conn = NULL;
29 vpri->dev = dev;
30
31 printk("vde backend - %s, ", vpri->vde_switch ?
32 vpri->vde_switch : "(default socket)");
33
34 vde_init_libstuff(vpri, init);
35
36 printk("\n");
37 }
38
39 static int vde_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
40 {
41 struct vde_data *pri = (struct vde_data *) &lp->user;
42
43 if (pri->conn != NULL)
44 return vde_user_read(pri->conn, skb_mac_header(skb),
45 skb->dev->mtu + ETH_HEADER_OTHER);
46
47 printk(KERN_ERR "vde_read - we have no VDECONN to read from");
48 return -EBADF;
49 }
50
51 static int vde_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
52 {
53 struct vde_data *pri = (struct vde_data *) &lp->user;
54
55 if (pri->conn != NULL)
56 return vde_user_write((void *)pri->conn, skb->data,
57 skb->len);
58
59 printk(KERN_ERR "vde_write - we have no VDECONN to write to");
60 return -EBADF;
61 }
62
63 static const struct net_kern_info vde_kern_info = {
64 .init = vde_init,
65 .protocol = eth_protocol,
66 .read = vde_read,
67 .write = vde_write,
68 };
69
70 static int vde_setup(char *str, char **mac_out, void *data)
71 {
72 struct vde_init *init = data;
73 char *remain, *port_str = NULL, *mode_str = NULL, *last;
74
75 *init = ((struct vde_init)
76 { .vde_switch = NULL,
77 .descr = NULL,
78 .port = 0,
79 .group = NULL,
80 .mode = 0 });
81
82 remain = split_if_spec(str, &init->vde_switch, mac_out, &port_str,
83 &init->group, &mode_str, &init->descr, NULL);
84
85 if (remain != NULL)
86 printk(KERN_WARNING "vde_setup - Ignoring extra data :"
87 "'%s'\n", remain);
88
89 if (port_str != NULL) {
90 init->port = simple_strtoul(port_str, &last, 10);
91 if ((*last != '\0') || (last == port_str)) {
92 printk(KERN_ERR "vde_setup - Bad port : '%s'\n",
93 port_str);
94 return 0;
95 }
96 }
97
98 if (mode_str != NULL) {
99 init->mode = simple_strtoul(mode_str, &last, 8);
100 if ((*last != '\0') || (last == mode_str)) {
101 printk(KERN_ERR "vde_setup - Bad mode : '%s'\n",
102 mode_str);
103 return 0;
104 }
105 }
106
107 printk(KERN_INFO "Configured vde device: %s\n", init->vde_switch ?
108 init->vde_switch : "(default socket)");
109
110 return 1;
111 }
112
113 static struct transport vde_transport = {
114 .list = LIST_HEAD_INIT(vde_transport.list),
115 .name = "vde",
116 .setup = vde_setup,
117 .user = &vde_user_info,
118 .kern = &vde_kern_info,
119 .private_size = sizeof(struct vde_data),
120 .setup_size = sizeof(struct vde_init),
121 };
122
123 static int register_vde(void)
124 {
125 register_transport(&vde_transport);
126 return 0;
127 }
128
129 late_initcall(register_vde);
130
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