1#include "linux/kernel.h"
2#include "linux/stddef.h"
3#include "linux/init.h"
4#include "linux/netdevice.h"
5#include "linux/if_arp.h"
6#include "net_kern.h"
7#include "net_user.h"
8#include "kern.h"
9#include "slip.h"
10
11struct slip_init {
12	char *gate_addr;
13};
14
15void slip_init(struct net_device *dev, void *data)
16{
17	struct uml_net_private *private;
18	struct slip_data *spri;
19	struct slip_init *init = data;
20
21	private = dev->priv;
22	spri = (struct slip_data *) private->user;
23
24	memset(spri->name, 0, sizeof(spri->name));
25	spri->addr = NULL;
26	spri->gate_addr = init->gate_addr;
27	spri->slave = -1;
28	spri->dev = dev;
29
30	slip_proto_init(&spri->slip);
31
32	dev->init = NULL;
33	dev->header_cache_update = NULL;
34	dev->hard_header_cache = NULL;
35	dev->hard_header = NULL;
36	dev->hard_header_len = 0;
37	dev->addr_len = 0;
38	dev->type = ARPHRD_SLIP;
39	dev->tx_queue_len = 256;
40	dev->flags = IFF_NOARP;
41	printk("SLIP backend - SLIP IP = %s\n", spri->gate_addr);
42}
43
44static unsigned short slip_protocol(struct sk_buff *skbuff)
45{
46	return(htons(ETH_P_IP));
47}
48
49static int slip_read(int fd, struct sk_buff **skb,
50		       struct uml_net_private *lp)
51{
52	return(slip_user_read(fd, skb_mac_header(*skb), (*skb)->dev->mtu,
53			      (struct slip_data *) &lp->user));
54}
55
56static int slip_write(int fd, struct sk_buff **skb,
57		      struct uml_net_private *lp)
58{
59	return(slip_user_write(fd, (*skb)->data, (*skb)->len,
60			       (struct slip_data *) &lp->user));
61}
62
63const struct net_kern_info slip_kern_info = {
64	.init			= slip_init,
65	.protocol		= slip_protocol,
66	.read			= slip_read,
67	.write			= slip_write,
68};
69
70static int slip_setup(char *str, char **mac_out, void *data)
71{
72	struct slip_init *init = data;
73
74	*init = ((struct slip_init)
75		{ .gate_addr 		= NULL });
76
77	if(str[0] != '\0')
78		init->gate_addr = str;
79	return(1);
80}
81
82static struct transport slip_transport = {
83	.list 		= LIST_HEAD_INIT(slip_transport.list),
84	.name 		= "slip",
85	.setup  	= slip_setup,
86	.user 		= &slip_user_info,
87	.kern 		= &slip_kern_info,
88	.private_size 	= sizeof(struct slip_data),
89	.setup_size 	= sizeof(struct slip_init),
90};
91
92static int register_slip(void)
93{
94	register_transport(&slip_transport);
95	return 0;
96}
97
98late_initcall(register_slip);
99