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 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
  35         printk("daemon backend (uml_switch version %d) - %s:%s",
  36                SWITCH_VERSION, dpri->sock_type, dpri->ctl_sock);
  37         printk("\n");
  38 }
  39
  40 static int daemon_read(int fd, struct sk_buff **skb,
  41                        struct uml_net_private *lp)
  42 {
  43         *skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
  44         if(*skb == NULL) return(-ENOMEM);
  45         return(net_recvfrom(fd, (*skb)->mac.raw,
  46                             (*skb)->dev->mtu + ETH_HEADER_OTHER));
  47 }
  48
  49 static int daemon_write(int fd, struct sk_buff **skb,
  50                         struct uml_net_private *lp)
  51 {
  52         return(daemon_user_write(fd, (*skb)->data, (*skb)->len,
  53                                  (struct daemon_data *) &lp->user));
  54 }
  55
  56 static struct net_kern_info daemon_kern_info = {
  57         .init                   = daemon_init,
  58         .protocol               = eth_protocol,
  59         .read                   = daemon_read,
  60         .write                  = daemon_write,
  61 };
  62
  63 int daemon_setup(char *str, char **mac_out, void *data)
  64 {
  65         struct daemon_init *init = data;
  66         char *remain;
  67
  68         *init = ((struct daemon_init)
  69                 { .sock_type            = "unix",
  70                   .ctl_sock             = "/tmp/uml.ctl" });
  71
  72         remain = split_if_spec(str, mac_out, &init->sock_type, &init->ctl_sock,
  73                                NULL);
  74         if(remain != NULL)
  75                 printk(KERN_WARNING "daemon_setup : Ignoring data socket "
  76                        "specification\n");
  77
  78         return(1);
  79 }
  80
  81 static struct transport daemon_transport = {
  82         .list           = LIST_HEAD_INIT(daemon_transport.list),
  83         .name           = "daemon",
  84         .setup          = daemon_setup,
  85         .user           = &daemon_user_info,
  86         .kern           = &daemon_kern_info,
  87         .private_size   = sizeof(struct daemon_data),
  88         .setup_size     = sizeof(struct daemon_init),
  89 };
  90
  91 static int register_daemon(void)
  92 {
  93         register_transport(&daemon_transport);
  94         return(1);
  95 }
  96
  97 __initcall(register_daemon);
  98
  99 /*
 100  * Overrides for Emacs so that we follow Linus's tabbing style.
 101  * Emacs will notice this stuff at the end of the file and automatically
 102  * adjust the settings for this buffer only.  This must remain at the end
 103  * of the file.
 104  * ---------------------------------------------------------------------------
 105  * Local variables:
 106  * c-file-style: "linux"
 107  * End:
 108  */