xref: /openbmc/linux/arch/um/drivers/daemon_kern.c (revision b0cbccf4)
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 
daemon_init(struct net_device * dev,void * data)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 
daemon_read(int fd,struct sk_buff * skb,struct uml_net_private * lp)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 
daemon_write(int fd,struct sk_buff * skb,struct uml_net_private * lp)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 
daemon_setup(char * str,char ** mac_out,void * data)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 
register_daemon(void)89 static int register_daemon(void)
90 {
91 	register_transport(&daemon_transport);
92 	return 0;
93 }
94 
95 late_initcall(register_daemon);
96