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 "slirp.h"
10
11struct slirp_init {
12	struct arg_list_dummy_wrapper argw;
13};
14
15void slirp_init(struct net_device *dev, void *data)
16{
17	struct uml_net_private *private;
18	struct slirp_data *spri;
19	struct slirp_init *init = data;
20	int i;
21
22	private = dev->priv;
23	spri = (struct slirp_data *) private->user;
24
25	spri->argw = init->argw;
26	spri->pid = -1;
27	spri->slave = -1;
28	spri->dev = dev;
29
30	slip_proto_init(&spri->slip);
31
32	dev->init = NULL;
33	dev->hard_header_len = 0;
34	dev->header_cache_update = NULL;
35	dev->hard_header_cache = NULL;
36	dev->hard_header = NULL;
37	dev->addr_len = 0;
38	dev->type = ARPHRD_SLIP;
39	dev->tx_queue_len = 256;
40	dev->flags = IFF_NOARP;
41	printk("SLIRP backend - command line:");
42	for(i=0;spri->argw.argv[i]!=NULL;i++) {
43		printk(" '%s'",spri->argw.argv[i]);
44	}
45	printk("\n");
46}
47
48static unsigned short slirp_protocol(struct sk_buff *skbuff)
49{
50	return(htons(ETH_P_IP));
51}
52
53static int slirp_read(int fd, struct sk_buff **skb,
54		       struct uml_net_private *lp)
55{
56	return(slirp_user_read(fd, skb_mac_header(*skb), (*skb)->dev->mtu,
57			      (struct slirp_data *) &lp->user));
58}
59
60static int slirp_write(int fd, struct sk_buff **skb,
61		      struct uml_net_private *lp)
62{
63	return(slirp_user_write(fd, (*skb)->data, (*skb)->len,
64			       (struct slirp_data *) &lp->user));
65}
66
67const struct net_kern_info slirp_kern_info = {
68	.init			= slirp_init,
69	.protocol		= slirp_protocol,
70	.read			= slirp_read,
71	.write			= slirp_write,
72};
73
74static int slirp_setup(char *str, char **mac_out, void *data)
75{
76	struct slirp_init *init = data;
77	int i=0;
78
79	*init = ((struct slirp_init)
80		{ .argw = { { "slirp", NULL  } } });
81
82	str = split_if_spec(str, mac_out, NULL);
83
84	if(str == NULL) { /* no command line given after MAC addr */
85		return(1);
86	}
87
88	do {
89		if(i>=SLIRP_MAX_ARGS-1) {
90			printk("slirp_setup: truncating slirp arguments\n");
91			break;
92		}
93		init->argw.argv[i++] = str;
94		while(*str && *str!=',') {
95			if(*str=='_') *str=' ';
96			str++;
97		}
98		if(*str!=',')
99			break;
100		*str++='\0';
101	} while(1);
102	init->argw.argv[i]=NULL;
103	return(1);
104}
105
106static struct transport slirp_transport = {
107	.list 		= LIST_HEAD_INIT(slirp_transport.list),
108	.name 		= "slirp",
109	.setup  	= slirp_setup,
110	.user 		= &slirp_user_info,
111	.kern 		= &slirp_kern_info,
112	.private_size 	= sizeof(struct slirp_data),
113	.setup_size 	= sizeof(struct slirp_init),
114};
115
116static int register_slirp(void)
117{
118	register_transport(&slirp_transport);
119	return 0;
120}
121
122late_initcall(register_slirp);
123