release/src-rt-6.x/linux/linux-2.6/arch/um/drivers/slirp_kern.c

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