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 = netdev_priv(dev);
  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_ops = NULL;
  38         dev->addr_len = 0;
  39         dev->type = ARPHRD_SLIP;
  40         dev->tx_queue_len = 256;
  41         dev->flags = IFF_NOARP;
  42         printk("SLIRP backend - command line:");
  43         for (i = 0; spri->argw.argv[i] != NULL; i++)
  44                 printk(" '%s'",spri->argw.argv[i]);
  45         printk("\n");
  46 }
  47
  48 static unsigned short slirp_protocol(struct sk_buff *skbuff)
  49 {
  50         return htons(ETH_P_IP);
  51 }
  52
  53 static int slirp_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
  54 {
  55         return slirp_user_read(fd, skb_mac_header(skb), skb->dev->mtu,
  56                                (struct slirp_data *) &lp->user);
  57 }
  58
  59 static int slirp_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
  60 {
  61         return slirp_user_write(fd, skb->data, skb->len,
  62                                 (struct slirp_data *) &lp->user);
  63 }
  64
  65 const struct net_kern_info slirp_kern_info = {
  66         .init                   = slirp_init,
  67         .protocol               = slirp_protocol,
  68         .read                   = slirp_read,
  69         .write                  = slirp_write,
  70 };
  71
  72 static int slirp_setup(char *str, char **mac_out, void *data)
  73 {
  74         struct slirp_init *init = data;
  75         int i=0;
  76
  77         *init = ((struct slirp_init) { .argw = { { "slirp", NULL  } } });
  78
  79         str = split_if_spec(str, mac_out, NULL);
  80
  81         if (str == NULL) /* no command line given after MAC addr */
  82                 return 1;
  83
  84         do {
  85                 if (i >= SLIRP_MAX_ARGS - 1) {
  86                         printk(KERN_WARNING "slirp_setup: truncating slirp "
  87                                "arguments\n");
  88                         break;
  89                 }
  90                 init->argw.argv[i++] = str;
  91                 while(*str && *str!=',') {
  92                         if (*str == '_')
  93                                 *str=' ';
  94                         str++;
  95                 }
  96                 if (*str != ',')
  97                         break;
  98                 *str++ = '\0';
  99         } while (1);
 100
 101         init->argw.argv[i] = NULL;
 102         return 1;
 103 }
 104
 105 static struct transport slirp_transport = {
 106         .list           = LIST_HEAD_INIT(slirp_transport.list),
 107         .name           = "slirp",
 108         .setup          = slirp_setup,
 109         .user           = &slirp_user_info,
 110         .kern           = &slirp_kern_info,
 111         .private_size   = sizeof(struct slirp_data),
 112         .setup_size     = sizeof(struct slirp_init),
 113 };
 114
 115 static int register_slirp(void)
 116 {
 117         register_transport(&slirp_transport);
 118         return 0;
 119 }
 120
 121 late_initcall(register_slirp);