1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
4 * James Leu (jleu@mindspring.net).
5 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
6 * Copyright (C) 2001 by various other people who didn't put their name here.
7 */
8
9 #include <linux/init.h>
10 #include <linux/netdevice.h>
11 #include <net_kern.h>
12 #include "daemon.h"
13
14 struct daemon_init {
15 char *sock_type;
16 char *ctl_sock;
17 };
18
19 static void daemon_init(struct net_device *dev, void *data)
20 {
21 struct uml_net_private *pri;
22 struct daemon_data *dpri;
23 struct daemon_init *init = data;
24
25 pri = netdev_priv(dev);
26 dpri = (struct daemon_data *) pri->user;
27 dpri->sock_type = init->sock_type;
28 dpri->ctl_sock = init->ctl_sock;
29 dpri->fd = -1;
30 dpri->control = -1;
31 dpri->dev = dev;
32 /* We will free this pointer. If it contains crap we're burned. */
33 dpri->ctl_addr = NULL;
34 dpri->data_addr = NULL;
35 dpri->local_addr = NULL;
36
37 printk("daemon backend (uml_switch version %d) - %s:%s",
38 SWITCH_VERSION, dpri->sock_type, dpri->ctl_sock);
39 printk("\n");
40 }
41
42 static int daemon_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
43 {
44 return net_recvfrom(fd, skb_mac_header(skb),
45 skb->dev->mtu + ETH_HEADER_OTHER);
46 }
47
48 static int daemon_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
49 {
50 return daemon_user_write(fd, skb->data, skb->len,
51 (struct daemon_data *) &lp->user);
52 }
53
54 static const struct net_kern_info daemon_kern_info = {
55 .init = daemon_init,
56 .protocol = eth_protocol,
57 .read = daemon_read,
58 .write = daemon_write,
59 };
60
61 static int daemon_setup(char *str, char **mac_out, void *data)
62 {
63 struct daemon_init *init = data;
64 char *remain;
65
66 *init = ((struct daemon_init)
67 { .sock_type = "unix",
68 .ctl_sock = CONFIG_UML_NET_DAEMON_DEFAULT_SOCK });
69
70 remain = split_if_spec(str, mac_out, &init->sock_type, &init->ctl_sock,
71 NULL);
72 if (remain != NULL)
73 printk(KERN_WARNING "daemon_setup : Ignoring data socket "
74 "specification\n");
75
76 return 1;
77 }
78
79 static struct transport daemon_transport = {
80 .list = LIST_HEAD_INIT(daemon_transport.list),
81 .name = "daemon",
82 .setup = daemon_setup,
83 .user = &daemon_user_info,
84 .kern = &daemon_kern_info,
85 .private_size = sizeof(struct daemon_data),
86 .setup_size = sizeof(struct daemon_init),
87 };
88
89 static int register_daemon(void)
90 {
91 register_transport(&daemon_transport);
92 return 0;
93 }
94
95 late_initcall(register_daemon);
96
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