1 /*
2 * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL.
4 */
5
6 #include <linux/if_arp.h>
7 #include "linux/init.h"
8 #include <linux/netdevice.h>
9 #include <linux/string.h>
10 #include "net_kern.h"
11 #include "net_user.h"
12 #include "slirp.h"
13
14 struct slirp_init {
15 struct arg_list_dummy_wrapper argw; /* XXX should be simpler... */
16 };
17
slirp_init(struct net_device * dev,void * data)18 void slirp_init(struct net_device *dev, void *data)
19 {
20 struct uml_net_private *private;
21 struct slirp_data *spri;
22 struct slirp_init *init = data;
23 int i;
24
25 private = netdev_priv(dev);
26 spri = (struct slirp_data *) private->user;
27
28 spri->argw = init->argw;
29 spri->pid = -1;
30 spri->slave = -1;
31 spri->dev = dev;
32
33 slip_proto_init(&spri->slip);
34
35 dev->init = NULL;
36 dev->hard_header_len = 0;
37 dev->header_ops = NULL;
38 dev->addr_len = 0;
39 dev->type = ARPHRD_SLIP;
40 dev->tx_queue_len = 256;
41 dev->flags = IFF_NOARP;
42 printk("SLIRP backend - command line:");
43 for (i = 0; spri->argw.argv[i] != NULL; i++)
44 printk(" '%s'",spri->argw.argv[i]);
45 printk("\n");
46 }
47
slirp_protocol(struct sk_buff * skbuff)48 static unsigned short slirp_protocol(struct sk_buff *skbuff)
49 {
50 return htons(ETH_P_IP);
51 }
52
slirp_read(int fd,struct sk_buff * skb,struct uml_net_private * lp)53 static int slirp_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
54 {
55 return slirp_user_read(fd, skb_mac_header(skb), skb->dev->mtu,
56 (struct slirp_data *) &lp->user);
57 }
58
slirp_write(int fd,struct sk_buff * skb,struct uml_net_private * lp)59 static int slirp_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
60 {
61 return slirp_user_write(fd, skb->data, skb->len,
62 (struct slirp_data *) &lp->user);
63 }
64
65 const struct net_kern_info slirp_kern_info = {
66 .init = slirp_init,
67 .protocol = slirp_protocol,
68 .read = slirp_read,
69 .write = slirp_write,
70 };
71
slirp_setup(char * str,char ** mac_out,void * data)72 static int slirp_setup(char *str, char **mac_out, void *data)
73 {
74 struct slirp_init *init = data;
75 int i=0;
76
77 *init = ((struct slirp_init) { .argw = { { "slirp", NULL } } });
78
79 str = split_if_spec(str, mac_out, NULL);
80
81 if (str == NULL) /* no command line given after MAC addr */
82 return 1;
83
84 do {
85 if (i >= SLIRP_MAX_ARGS - 1) {
86 printk(KERN_WARNING "slirp_setup: truncating slirp "
87 "arguments\n");
88 break;
89 }
90 init->argw.argv[i++] = str;
91 while(*str && *str!=',') {
92 if (*str == '_')
93 *str=' ';
94 str++;
95 }
96 if (*str != ',')
97 break;
98 *str++ = '\0';
99 } while (1);
100
101 init->argw.argv[i] = NULL;
102 return 1;
103 }
104
105 static struct transport slirp_transport = {
106 .list = LIST_HEAD_INIT(slirp_transport.list),
107 .name = "slirp",
108 .setup = slirp_setup,
109 .user = &slirp_user_info,
110 .kern = &slirp_kern_info,
111 .private_size = sizeof(struct slirp_data),
112 .setup_size = sizeof(struct slirp_init),
113 };
114
register_slirp(void)115 static int register_slirp(void)
116 {
117 register_transport(&slirp_transport);
118 return 0;
119 }
120
121 late_initcall(register_slirp);
122