arch/um/drivers/daemon_kern.c

   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             = "/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
  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);