1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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
18 static 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->hard_header_len = 0;
36 dev->header_ops = 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 printk("\n");
45 }
46
47 static unsigned short slirp_protocol(struct sk_buff *skbuff)
48 {
49 return htons(ETH_P_IP);
50 }
51
52 static int slirp_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
53 {
54 return slirp_user_read(fd, skb_mac_header(skb), skb->dev->mtu,
55 (struct slirp_data *) &lp->user);
56 }
57
58 static int slirp_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
59 {
60 return slirp_user_write(fd, skb->data, skb->len,
61 (struct slirp_data *) &lp->user);
62 }
63
64 const struct net_kern_info slirp_kern_info = {
65 .init = slirp_init,
66 .protocol = slirp_protocol,
67 .read = slirp_read,
68 .write = slirp_write,
69 };
70
71 static int slirp_setup(char *str, char **mac_out, void *data)
72 {
73 struct slirp_init *init = data;
74 int i=0;
75
76 *init = ((struct slirp_init) { .argw = { { "slirp", NULL } } });
77
78 str = split_if_spec(str, mac_out, NULL);
79
80 if (str == NULL) /* no command line given after MAC addr */
81 return 1;
82
83 do {
84 if (i >= SLIRP_MAX_ARGS - 1) {
85 printk(KERN_WARNING "slirp_setup: truncating slirp "
86 "arguments\n");
87 break;
88 }
89 init->argw.argv[i++] = str;
90 while(*str && *str!=',') {
91 if (*str == '_')
92 *str=' ';
93 str++;
94 }
95 if (*str != ',')
96 break;
97 *str++ = '\0';
98 } while (1);
99
100 init->argw.argv[i] = NULL;
101 return 1;
102 }
103
104 static struct transport slirp_transport = {
105 .list = LIST_HEAD_INIT(slirp_transport.list),
106 .name = "slirp",
107 .setup = slirp_setup,
108 .user = &slirp_user_info,
109 .kern = &slirp_kern_info,
110 .private_size = sizeof(struct slirp_data),
111 .setup_size = sizeof(struct slirp_init),
112 };
113
114 static int register_slirp(void)
115 {
116 register_transport(&slirp_transport);
117 return 0;
118 }
119
120 late_initcall(register_slirp);
121
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