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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/um/drivers/daemon_kern.c
10817 views
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/*

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 * Copyright (C) 2001 Lennert Buytenhek ([email protected]) and

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 * James Leu ([email protected]).

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 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)

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 * Copyright (C) 2001 by various other people who didn't put their name here.

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 * Licensed under the GPL.

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 */

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#include "linux/init.h"

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#include <linux/netdevice.h>

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#include "net_kern.h"

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#include "daemon.h"

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struct daemon_init {

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	char *sock_type;

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	char *ctl_sock;

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};

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static void daemon_init(struct net_device *dev, void *data)

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{

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	struct uml_net_private *pri;

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	struct daemon_data *dpri;

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	struct daemon_init *init = data;

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	pri = netdev_priv(dev);

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	dpri = (struct daemon_data *) pri->user;

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	dpri->sock_type = init->sock_type;

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	dpri->ctl_sock = init->ctl_sock;

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	dpri->fd = -1;

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	dpri->control = -1;

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	dpri->dev = dev;

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	/* We will free this pointer. If it contains crap we're burned. */

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	dpri->ctl_addr = NULL;

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	dpri->data_addr = NULL;

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	dpri->local_addr = NULL;

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	printk("daemon backend (uml_switch version %d) - %s:%s",

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	       SWITCH_VERSION, dpri->sock_type, dpri->ctl_sock);

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	printk("\n");

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}

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static int daemon_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)

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{

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	return net_recvfrom(fd, skb_mac_header(skb),

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			    skb->dev->mtu + ETH_HEADER_OTHER);

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}

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static int daemon_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)

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{

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	return daemon_user_write(fd, skb->data, skb->len,

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				 (struct daemon_data *) &lp->user);

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}

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static const struct net_kern_info daemon_kern_info = {

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	.init			= daemon_init,

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	.protocol		= eth_protocol,

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	.read			= daemon_read,

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	.write			= daemon_write,

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};

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static int daemon_setup(char *str, char **mac_out, void *data)

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{

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	struct daemon_init *init = data;

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	char *remain;

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	*init = ((struct daemon_init)

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		{ .sock_type 		= "unix",

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		  .ctl_sock 		= "/tmp/uml.ctl" });

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	remain = split_if_spec(str, mac_out, &init->sock_type, &init->ctl_sock,

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			       NULL);

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	if (remain != NULL)

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		printk(KERN_WARNING "daemon_setup : Ignoring data socket "

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		       "specification\n");

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	return 1;

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}

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static struct transport daemon_transport = {

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	.list 		= LIST_HEAD_INIT(daemon_transport.list),

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	.name 		= "daemon",

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	.setup  	= daemon_setup,

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	.user 		= &daemon_user_info,

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	.kern 		= &daemon_kern_info,

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	.private_size 	= sizeof(struct daemon_data),

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	.setup_size 	= sizeof(struct daemon_init),

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};

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static int register_daemon(void)

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{

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	register_transport(&daemon_transport);

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	return 0;

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}

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late_initcall(register_daemon);

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