daemon_kern.c

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/*
 * Copyright (C) 2001 Lennert Buytenhek ([email protected]) and
 * James Leu ([email protected]).
 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Copyright (C) 2001 by various other people who didn't put their name here.
 * Licensed under the GPL.
 */

#include <linux/init.h>
#include <linux/netdevice.h>
#include <net_kern.h>
#include "daemon.h"

struct daemon_init {
    char *sock_type;
    char *ctl_sock;
};

static void daemon_init(struct net_device *dev, void *data)
{
    struct uml_net_private *pri;
    struct daemon_data *dpri;
    struct daemon_init *init = data;

    pri = netdev_priv(dev);
    dpri = (struct daemon_data *) pri->user;
    dpri->sock_type = init->sock_type;
    dpri->ctl_sock = init->ctl_sock;
    dpri->fd = -1;
    dpri->control = -1;
    dpri->dev = dev;
    /* We will free this pointer. If it contains crap we're burned. */
    dpri->ctl_addr = NULL;
    dpri->data_addr = NULL;
    dpri->local_addr = NULL;

    printk("daemon backend (uml_switch version %d) - %s:%s",
           SWITCH_VERSION, dpri->sock_type, dpri->ctl_sock);
    printk("\n");
}

static int daemon_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
    return net_recvfrom(fd, skb_mac_header(skb),
                skb->dev->mtu + ETH_HEADER_OTHER);
}

static int daemon_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
    return daemon_user_write(fd, skb->data, skb->len,
                 (struct daemon_data *) &lp->user);
}

static const struct net_kern_info daemon_kern_info = {
    .init           = daemon_init,
    .protocol       = eth_protocol,
    .read           = daemon_read,
    .write          = daemon_write,
};

static int daemon_setup(char *str, char **mac_out, void *data)
{
    struct daemon_init *init = data;
    char *remain;

    *init = ((struct daemon_init)
        { .sock_type        = "unix",
          .ctl_sock         = "/tmp/uml.ctl" });

    remain = split_if_spec(str, mac_out, &init->sock_type, &init->ctl_sock,
                   NULL);
    if (remain != NULL)
        printk(KERN_WARNING "daemon_setup : Ignoring data socket "
               "specification\n");

    return 1;
}

static struct transport daemon_transport = {
    .list       = LIST_HEAD_INIT(daemon_transport.list),
    .name       = "daemon",
    .setup      = daemon_setup,
    .user       = &daemon_user_info,
    .kern       = &daemon_kern_info,
    .private_size   = sizeof(struct daemon_data),
    .setup_size     = sizeof(struct daemon_init),
};

static int register_daemon(void)
{
    register_transport(&daemon_transport);
    return 0;
}

late_initcall(register_daemon);