LXR linux/arch/um/drivers/daemon

   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
  14struct daemon_init {
  15        char *sock_type;
  16        char *ctl_sock;
  17};
  18
  19static 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
  42static 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
  48static 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
  54static 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
  61static 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             = "/tmp/uml.ctl" });
  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
  79static 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
  89static int register_daemon(void)
  90{
  91        register_transport(&daemon_transport);
  92        return 0;
  93}
  94
  95late_initcall(register_daemon);
  96