git.oblomov.eu Git - linux-2.6/blob - arch/um/drivers/daemon_kern.c

   1 /*
   2  * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
   3  * James Leu (jleu@mindspring.net).
   4  * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   5  * Copyright (C) 2001 by various other people who didn't put their name here.
   6  * Licensed under the GPL.
   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 = dev->priv;
  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,
  43                        struct uml_net_private *lp)
  44 {
  45         *skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
  46         if (*skb == NULL)
  47                 return -ENOMEM;
  48         return net_recvfrom(fd, skb_mac_header(*skb),
  49                             (*skb)->dev->mtu + ETH_HEADER_OTHER);
  50 }
  51
  52 static int daemon_write(int fd, struct sk_buff **skb,
  53                         struct uml_net_private *lp)
  54 {
  55         return daemon_user_write(fd, (*skb)->data, (*skb)->len,
  56                                  (struct daemon_data *) &lp->user);
  57 }
  58
  59 static const struct net_kern_info daemon_kern_info = {
  60         .init                   = daemon_init,
  61         .protocol               = eth_protocol,
  62         .read                   = daemon_read,
  63         .write                  = daemon_write,
  64 };
  65
  66 static int daemon_setup(char *str, char **mac_out, void *data)
  67 {
  68         struct daemon_init *init = data;
  69         char *remain;
  70
  71         *init = ((struct daemon_init)
  72                 { .sock_type            = "unix",
  73                   .ctl_sock             = "/tmp/uml.ctl" });
  74
  75         remain = split_if_spec(str, mac_out, &init->sock_type, &init->ctl_sock,
  76                                NULL);
  77         if (remain != NULL)
  78                 printk(KERN_WARNING "daemon_setup : Ignoring data socket "
  79                        "specification\n");
  80
  81         return 1;
  82 }
  83
  84 static struct transport daemon_transport = {
  85         .list           = LIST_HEAD_INIT(daemon_transport.list),
  86         .name           = "daemon",
  87         .setup          = daemon_setup,
  88         .user           = &daemon_user_info,
  89         .kern           = &daemon_kern_info,
  90         .private_size   = sizeof(struct daemon_data),
  91         .setup_size     = sizeof(struct daemon_init),
  92 };
  93
  94 static int register_daemon(void)
  95 {
  96         register_transport(&daemon_transport);
  97         return 0;
  98 }
  99
 100 late_initcall(register_daemon);