1/*
2 * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org).
3 * Licensed under the GPL.
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
16static 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
39static 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
51static 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
63static 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
70static 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
113static 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
123static int register_vde(void)
124{
125	register_transport(&vde_transport);
126	return 0;
127}
128
129late_initcall(register_vde);
130