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 <linux/string.h>
10*4882a593Smuzhiyun #include <net_kern.h>
11*4882a593Smuzhiyun #include <net_user.h>
12*4882a593Smuzhiyun #include "slirp.h"
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun struct slirp_init {
15*4882a593Smuzhiyun struct arg_list_dummy_wrapper argw; /* XXX should be simpler... */
16*4882a593Smuzhiyun };
17*4882a593Smuzhiyun
slirp_init(struct net_device * dev,void * data)18*4882a593Smuzhiyun void slirp_init(struct net_device *dev, void *data)
19*4882a593Smuzhiyun {
20*4882a593Smuzhiyun struct uml_net_private *private;
21*4882a593Smuzhiyun struct slirp_data *spri;
22*4882a593Smuzhiyun struct slirp_init *init = data;
23*4882a593Smuzhiyun int i;
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun private = netdev_priv(dev);
26*4882a593Smuzhiyun spri = (struct slirp_data *) private->user;
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun spri->argw = init->argw;
29*4882a593Smuzhiyun spri->pid = -1;
30*4882a593Smuzhiyun spri->slave = -1;
31*4882a593Smuzhiyun spri->dev = dev;
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun slip_proto_init(&spri->slip);
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun dev->hard_header_len = 0;
36*4882a593Smuzhiyun dev->header_ops = NULL;
37*4882a593Smuzhiyun dev->addr_len = 0;
38*4882a593Smuzhiyun dev->type = ARPHRD_SLIP;
39*4882a593Smuzhiyun dev->tx_queue_len = 256;
40*4882a593Smuzhiyun dev->flags = IFF_NOARP;
41*4882a593Smuzhiyun printk("SLIRP backend - command line:");
42*4882a593Smuzhiyun for (i = 0; spri->argw.argv[i] != NULL; i++)
43*4882a593Smuzhiyun printk(" '%s'",spri->argw.argv[i]);
44*4882a593Smuzhiyun printk("\n");
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
slirp_protocol(struct sk_buff * skbuff)47*4882a593Smuzhiyun static unsigned short slirp_protocol(struct sk_buff *skbuff)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun return htons(ETH_P_IP);
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
slirp_read(int fd,struct sk_buff * skb,struct uml_net_private * lp)52*4882a593Smuzhiyun static int slirp_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
53*4882a593Smuzhiyun {
54*4882a593Smuzhiyun return slirp_user_read(fd, skb_mac_header(skb), skb->dev->mtu,
55*4882a593Smuzhiyun (struct slirp_data *) &lp->user);
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun
slirp_write(int fd,struct sk_buff * skb,struct uml_net_private * lp)58*4882a593Smuzhiyun static int slirp_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
59*4882a593Smuzhiyun {
60*4882a593Smuzhiyun return slirp_user_write(fd, skb->data, skb->len,
61*4882a593Smuzhiyun (struct slirp_data *) &lp->user);
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun const struct net_kern_info slirp_kern_info = {
65*4882a593Smuzhiyun .init = slirp_init,
66*4882a593Smuzhiyun .protocol = slirp_protocol,
67*4882a593Smuzhiyun .read = slirp_read,
68*4882a593Smuzhiyun .write = slirp_write,
69*4882a593Smuzhiyun };
70*4882a593Smuzhiyun
slirp_setup(char * str,char ** mac_out,void * data)71*4882a593Smuzhiyun static int slirp_setup(char *str, char **mac_out, void *data)
72*4882a593Smuzhiyun {
73*4882a593Smuzhiyun struct slirp_init *init = data;
74*4882a593Smuzhiyun int i=0;
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun *init = ((struct slirp_init) { .argw = { { "slirp", NULL } } });
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun str = split_if_spec(str, mac_out, NULL);
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun if (str == NULL) /* no command line given after MAC addr */
81*4882a593Smuzhiyun return 1;
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun do {
84*4882a593Smuzhiyun if (i >= SLIRP_MAX_ARGS - 1) {
85*4882a593Smuzhiyun printk(KERN_WARNING "slirp_setup: truncating slirp "
86*4882a593Smuzhiyun "arguments\n");
87*4882a593Smuzhiyun break;
88*4882a593Smuzhiyun }
89*4882a593Smuzhiyun init->argw.argv[i++] = str;
90*4882a593Smuzhiyun while(*str && *str!=',') {
91*4882a593Smuzhiyun if (*str == '_')
92*4882a593Smuzhiyun *str=' ';
93*4882a593Smuzhiyun str++;
94*4882a593Smuzhiyun }
95*4882a593Smuzhiyun if (*str != ',')
96*4882a593Smuzhiyun break;
97*4882a593Smuzhiyun *str++ = '\0';
98*4882a593Smuzhiyun } while (1);
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun init->argw.argv[i] = NULL;
101*4882a593Smuzhiyun return 1;
102*4882a593Smuzhiyun }
103*4882a593Smuzhiyun
104*4882a593Smuzhiyun static struct transport slirp_transport = {
105*4882a593Smuzhiyun .list = LIST_HEAD_INIT(slirp_transport.list),
106*4882a593Smuzhiyun .name = "slirp",
107*4882a593Smuzhiyun .setup = slirp_setup,
108*4882a593Smuzhiyun .user = &slirp_user_info,
109*4882a593Smuzhiyun .kern = &slirp_kern_info,
110*4882a593Smuzhiyun .private_size = sizeof(struct slirp_data),
111*4882a593Smuzhiyun .setup_size = sizeof(struct slirp_init),
112*4882a593Smuzhiyun };
113*4882a593Smuzhiyun
register_slirp(void)114*4882a593Smuzhiyun static int register_slirp(void)
115*4882a593Smuzhiyun {
116*4882a593Smuzhiyun register_transport(&slirp_transport);
117*4882a593Smuzhiyun return 0;
118*4882a593Smuzhiyun }
119*4882a593Smuzhiyun
120*4882a593Smuzhiyun late_initcall(register_slirp);
121