Merge tag 'powerpc-5.7-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...
[linux-2.6-microblaze.git] / arch / um / drivers / slirp_kern.c
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 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);