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