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         *spri = ((struct slirp_data)
  25                 { .argw         = init->argw,
  26                   .pid          = -1,
  27                   .slave        = -1,
  28                   .ibuf         = { '\0' },
  29                   .obuf         = { '\0' },
  30                   .pos          = 0,
  31                   .esc          = 0,
  32                   .dev          = dev });
  33
  34         dev->init = NULL;
  35         dev->hard_header_len = 0;
  36         dev->header_cache_update = NULL;
  37         dev->hard_header_cache = NULL;
  38         dev->hard_header = NULL;
  39         dev->addr_len = 0;
  40         dev->type = ARPHRD_SLIP;
  41         dev->tx_queue_len = 256;
  42         dev->flags = IFF_NOARP;
  43         printk("SLIRP backend - command line:");
  44         for(i=0;spri->argw.argv[i]!=NULL;i++) {
  45                 printk(" '%s'",spri->argw.argv[i]);
  46         }
  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.raw, (*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 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)
  82                 { argw :                { { "slirp", NULL  } } });
  83
  84         str = split_if_spec(str, mac_out, NULL);
  85
  86         if(str == NULL) { /* no command line given after MAC addr */
  87                 return(1);
  88         }
  89
  90         do {
  91                 if(i>=SLIRP_MAX_ARGS-1) {
  92                         printk("slirp_setup: truncating slirp arguments\n");
  93                         break;
  94                 }
  95                 init->argw.argv[i++] = str;
  96                 while(*str && *str!=',') {
  97                         if(*str=='_') *str=' ';
  98                         str++;
  99                 }
 100                 if(*str!=',')
 101                         break;
 102                 *str++='\0';
 103         } while(1);
 104         init->argw.argv[i]=NULL;
 105         return(1);
 106 }
 107
 108 static struct transport slirp_transport = {
 109         .list           = LIST_HEAD_INIT(slirp_transport.list),
 110         .name           = "slirp",
 111         .setup          = slirp_setup,
 112         .user           = &slirp_user_info,
 113         .kern           = &slirp_kern_info,
 114         .private_size   = sizeof(struct slirp_data),
 115         .setup_size     = sizeof(struct slirp_init),
 116 };
 117
 118 static int register_slirp(void)
 119 {
 120         register_transport(&slirp_transport);
 121         return(1);
 122 }
 123
 124 __initcall(register_slirp);
 125
 126 /*
 127  * Overrides for Emacs so that we follow Linus's tabbing style.
 128  * Emacs will notice this stuff at the end of the file and automatically
 129  * adjust the settings for this buffer only.  This must remain at the end
 130  * of the file.
 131  * ---------------------------------------------------------------------------
 132  * Local variables:
 133  * c-file-style: "linux"
 134  * End:
 135  */