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 by various other people who didn't put their name here.
   5  * Licensed under the GPL.
   6  */
   7
   8 #include "linux/kernel.h"
   9 #include "linux/init.h"
  10 #include "linux/netdevice.h"
  11 #include "linux/etherdevice.h"
  12 #include "net_kern.h"
  13 #include "net_user.h"
  14 #include "daemon.h"
  15
  16 struct daemon_init {
  17         char *sock_type;
  18         char *ctl_sock;
  19 };
  20
  21 static void daemon_init(struct net_device *dev, void *data)
  22 {
  23         struct uml_net_private *pri;
  24         struct daemon_data *dpri;
  25         struct daemon_init *init = data;
  26
  27         pri = dev->priv;
  28         dpri = (struct daemon_data *) pri->user;
  29         dpri->sock_type = init->sock_type;
  30         dpri->ctl_sock = init->ctl_sock;
  31         dpri->fd = -1;
  32         dpri->control = -1;
  33         dpri->dev = dev;
  34         /* We will free this pointer. If it contains crap we're burned. */
  35         dpri->ctl_addr = NULL;
  36         dpri->data_addr = NULL;
  37         dpri->local_addr = NULL;
  38
  39         printk("daemon backend (uml_switch version %d) - %s:%s",
  40                SWITCH_VERSION, dpri->sock_type, dpri->ctl_sock);
  41         printk("\n");
  42 }
  43
  44 static int daemon_read(int fd, struct sk_buff **skb,
  45                        struct uml_net_private *lp)
  46 {
  47         *skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
  48         if(*skb == NULL) return(-ENOMEM);
  49         return(net_recvfrom(fd, skb_mac_header(*skb),
  50                             (*skb)->dev->mtu + ETH_HEADER_OTHER));
  51 }
  52
  53 static int daemon_write(int fd, struct sk_buff **skb,
  54                         struct uml_net_private *lp)
  55 {
  56         return(daemon_user_write(fd, (*skb)->data, (*skb)->len,
  57                                  (struct daemon_data *) &lp->user));
  58 }
  59
  60 static const struct net_kern_info daemon_kern_info = {
  61         .init                   = daemon_init,
  62         .protocol               = eth_protocol,
  63         .read                   = daemon_read,
  64         .write                  = daemon_write,
  65 };
  66
  67 static int daemon_setup(char *str, char **mac_out, void *data)
  68 {
  69         struct daemon_init *init = data;
  70         char *remain;
  71
  72         *init = ((struct daemon_init)
  73                 { .sock_type            = "unix",
  74                   .ctl_sock             = "/tmp/uml.ctl" });
  75
  76         remain = split_if_spec(str, mac_out, &init->sock_type, &init->ctl_sock,
  77                                NULL);
  78         if(remain != NULL)
  79                 printk(KERN_WARNING "daemon_setup : Ignoring data socket "
  80                        "specification\n");
  81
  82         return(1);
  83 }
  84
  85 static struct transport daemon_transport = {
  86         .list           = LIST_HEAD_INIT(daemon_transport.list),
  87         .name           = "daemon",
  88         .setup          = daemon_setup,
  89         .user           = &daemon_user_info,
  90         .kern           = &daemon_kern_info,
  91         .private_size   = sizeof(struct daemon_data),
  92         .setup_size     = sizeof(struct daemon_init),
  93 };
  94
  95 static int register_daemon(void)
  96 {
  97         register_transport(&daemon_transport);
  98         return 0;
  99 }
 100
 101 late_initcall(register_daemon);