arch/um/drivers/slirp_kern.c

   1 /*
   2  * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3  * Licensed under the GPL.
   4  */
   5
   6 #include <linux/if_arp.h>
   7 #include "linux/init.h"
   8 #include <linux/netdevice.h>
   9 #include <linux/string.h>
  10 #include "net_kern.h"
  11 #include "net_user.h"
  12 #include "slirp.h"
  13
  14 struct slirp_init {
  15         struct arg_list_dummy_wrapper argw;  /* XXX should be simpler... */
  16 };
  17
  18 void slirp_init(struct net_device *dev, void *data)
  19 {
  20         struct uml_net_private *private;
  21         struct slirp_data *spri;
  22         struct slirp_init *init = data;
  23         int i;
  24
  25         private = dev->priv;
  26         spri = (struct slirp_data *) private->user;
  27
  28         spri->argw = init->argw;
  29         spri->pid = -1;
  30         spri->slave = -1;
  31         spri->dev = dev;
  32
  33         slip_proto_init(&spri->slip);
  34
  35         dev->init = NULL;
  36         dev->hard_header_len = 0;
  37         dev->header_cache_update = NULL;
  38         dev->hard_header_cache = NULL;
  39         dev->hard_header = NULL;
  40         dev->addr_len = 0;
  41         dev->type = ARPHRD_SLIP;
  42         dev->tx_queue_len = 256;
  43         dev->flags = IFF_NOARP;
  44         printk("SLIRP backend - command line:");
  45         for (i = 0; spri->argw.argv[i] != NULL; i++)
  46                 printk(" '%s'",spri->argw.argv[i]);
  47         printk("\n");
  48 }
  49
  50 static unsigned short slirp_protocol(struct sk_buff *skbuff)
  51 {
  52         return htons(ETH_P_IP);
  53 }
  54
  55 static int slirp_read(int fd, struct sk_buff **skb,
  56                        struct uml_net_private *lp)
  57 {
  58         return slirp_user_read(fd, skb_mac_header(*skb), (*skb)->dev->mtu,
  59                               (struct slirp_data *) &lp->user);
  60 }
  61
  62 static int slirp_write(int fd, struct sk_buff **skb,
  63                       struct uml_net_private *lp)
  64 {
  65         return slirp_user_write(fd, (*skb)->data, (*skb)->len,
  66                                (struct slirp_data *) &lp->user);
  67 }
  68
  69 const struct net_kern_info slirp_kern_info = {
  70         .init                   = slirp_init,
  71         .protocol               = slirp_protocol,
  72         .read                   = slirp_read,
  73         .write                  = slirp_write,
  74 };
  75
  76 static int slirp_setup(char *str, char **mac_out, void *data)
  77 {
  78         struct slirp_init *init = data;
  79         int i=0;
  80
  81         *init = ((struct slirp_init) { .argw = { { "slirp", NULL  } } });
  82
  83         str = split_if_spec(str, mac_out, NULL);
  84
  85         if (str == NULL) /* no command line given after MAC addr */
  86                 return 1;
  87
  88         do {
  89                 if (i >= SLIRP_MAX_ARGS - 1) {
  90                         printk(KERN_WARNING "slirp_setup: truncating slirp "
  91                                "arguments\n");
  92                         break;
  93                 }
  94                 init->argw.argv[i++] = str;
  95                 while(*str && *str!=',') {
  96                         if (*str == '_')
  97                                 *str=' ';
  98                         str++;
  99                 }
 100                 if (*str != ',')
 101                         break;
 102                 *str++ = '\0';
 103         } while (1);
 104
 105         init->argw.argv[i] = NULL;
 106         return 1;
 107 }
 108
 109 static struct transport slirp_transport = {
 110         .list           = LIST_HEAD_INIT(slirp_transport.list),
 111         .name           = "slirp",
 112         .setup          = slirp_setup,
 113         .user           = &slirp_user_info,
 114         .kern           = &slirp_kern_info,
 115         .private_size   = sizeof(struct slirp_data),
 116         .setup_size     = sizeof(struct slirp_init),
 117 };
 118
 119 static int register_slirp(void)
 120 {
 121         register_transport(&slirp_transport);
 122         return 0;
 123 }
 124
 125 late_initcall(register_slirp);