1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <linux/if_arp.h>
7*4882a593Smuzhiyun #include <linux/init.h>
8*4882a593Smuzhiyun #include <linux/netdevice.h>
9*4882a593Smuzhiyun #include <net_kern.h>
10*4882a593Smuzhiyun #include "slip.h"
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun struct slip_init {
13*4882a593Smuzhiyun char *gate_addr;
14*4882a593Smuzhiyun };
15*4882a593Smuzhiyun
slip_init(struct net_device * dev,void * data)16*4882a593Smuzhiyun static void slip_init(struct net_device *dev, void *data)
17*4882a593Smuzhiyun {
18*4882a593Smuzhiyun struct uml_net_private *private;
19*4882a593Smuzhiyun struct slip_data *spri;
20*4882a593Smuzhiyun struct slip_init *init = data;
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun private = netdev_priv(dev);
23*4882a593Smuzhiyun spri = (struct slip_data *) private->user;
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun memset(spri->name, 0, sizeof(spri->name));
26*4882a593Smuzhiyun spri->addr = NULL;
27*4882a593Smuzhiyun spri->gate_addr = init->gate_addr;
28*4882a593Smuzhiyun spri->slave = -1;
29*4882a593Smuzhiyun spri->dev = dev;
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun slip_proto_init(&spri->slip);
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun dev->hard_header_len = 0;
34*4882a593Smuzhiyun dev->header_ops = NULL;
35*4882a593Smuzhiyun dev->addr_len = 0;
36*4882a593Smuzhiyun dev->type = ARPHRD_SLIP;
37*4882a593Smuzhiyun dev->tx_queue_len = 256;
38*4882a593Smuzhiyun dev->flags = IFF_NOARP;
39*4882a593Smuzhiyun printk("SLIP backend - SLIP IP = %s\n", spri->gate_addr);
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun
slip_protocol(struct sk_buff * skbuff)42*4882a593Smuzhiyun static unsigned short slip_protocol(struct sk_buff *skbuff)
43*4882a593Smuzhiyun {
44*4882a593Smuzhiyun return htons(ETH_P_IP);
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
slip_read(int fd,struct sk_buff * skb,struct uml_net_private * lp)47*4882a593Smuzhiyun static int slip_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun return slip_user_read(fd, skb_mac_header(skb), skb->dev->mtu,
50*4882a593Smuzhiyun (struct slip_data *) &lp->user);
51*4882a593Smuzhiyun }
52*4882a593Smuzhiyun
slip_write(int fd,struct sk_buff * skb,struct uml_net_private * lp)53*4882a593Smuzhiyun static int slip_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
54*4882a593Smuzhiyun {
55*4882a593Smuzhiyun return slip_user_write(fd, skb->data, skb->len,
56*4882a593Smuzhiyun (struct slip_data *) &lp->user);
57*4882a593Smuzhiyun }
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun static const struct net_kern_info slip_kern_info = {
60*4882a593Smuzhiyun .init = slip_init,
61*4882a593Smuzhiyun .protocol = slip_protocol,
62*4882a593Smuzhiyun .read = slip_read,
63*4882a593Smuzhiyun .write = slip_write,
64*4882a593Smuzhiyun };
65*4882a593Smuzhiyun
slip_setup(char * str,char ** mac_out,void * data)66*4882a593Smuzhiyun static int slip_setup(char *str, char **mac_out, void *data)
67*4882a593Smuzhiyun {
68*4882a593Smuzhiyun struct slip_init *init = data;
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun *init = ((struct slip_init) { .gate_addr = NULL });
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun if (str[0] != '\0')
73*4882a593Smuzhiyun init->gate_addr = str;
74*4882a593Smuzhiyun return 1;
75*4882a593Smuzhiyun }
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun static struct transport slip_transport = {
78*4882a593Smuzhiyun .list = LIST_HEAD_INIT(slip_transport.list),
79*4882a593Smuzhiyun .name = "slip",
80*4882a593Smuzhiyun .setup = slip_setup,
81*4882a593Smuzhiyun .user = &slip_user_info,
82*4882a593Smuzhiyun .kern = &slip_kern_info,
83*4882a593Smuzhiyun .private_size = sizeof(struct slip_data),
84*4882a593Smuzhiyun .setup_size = sizeof(struct slip_init),
85*4882a593Smuzhiyun };
86*4882a593Smuzhiyun
register_slip(void)87*4882a593Smuzhiyun static int register_slip(void)
88*4882a593Smuzhiyun {
89*4882a593Smuzhiyun register_transport(&slip_transport);
90*4882a593Smuzhiyun return 0;
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun late_initcall(register_slip);
94