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                   .slip         = SLIP_PROTO_INIT,
  29                   .dev          = dev });
  30
  31         dev->init = NULL;
  32         dev->hard_header_len = 0;
  33         dev->header_cache_update = NULL;
  34         dev->hard_header_cache = NULL;
  35         dev->hard_header = NULL;
  36         dev->addr_len = 0;
  37         dev->type = ARPHRD_SLIP;
  38         dev->tx_queue_len = 256;
  39         dev->flags = IFF_NOARP;
  40         printk("SLIRP backend - command line:");
  41         for(i=0;spri->argw.argv[i]!=NULL;i++) {
  42                 printk(" '%s'",spri->argw.argv[i]);
  43         }
  44         printk("\n");
  45 }
  46
  47 static unsigned short slirp_protocol(struct sk_buff *skbuff)
  48 {
  49         return(htons(ETH_P_IP));
  50 }
  51
  52 static int slirp_read(int fd, struct sk_buff **skb,
  53                        struct uml_net_private *lp)
  54 {
  55         return(slirp_user_read(fd, (*skb)->mac.raw, (*skb)->dev->mtu,
  56                               (struct slirp_data *) &lp->user));
  57 }
  58
  59 static int slirp_write(int fd, struct sk_buff **skb,
  60                       struct uml_net_private *lp)
  61 {
  62         return(slirp_user_write(fd, (*skb)->data, (*skb)->len,
  63                                (struct slirp_data *) &lp->user));
  64 }
  65
  66 struct net_kern_info slirp_kern_info = {
  67         .init                   = slirp_init,
  68         .protocol               = slirp_protocol,
  69         .read                   = slirp_read,
  70         .write                  = slirp_write,
  71 };
  72
  73 static int slirp_setup(char *str, char **mac_out, void *data)
  74 {
  75         struct slirp_init *init = data;
  76         int i=0;
  77
  78         *init = ((struct slirp_init)
  79                 { argw :                { { "slirp", NULL  } } });
  80
  81         str = split_if_spec(str, mac_out, NULL);
  82
  83         if(str == NULL) { /* no command line given after MAC addr */
  84                 return(1);
  85         }
  86
  87         do {
  88                 if(i>=SLIRP_MAX_ARGS-1) {
  89                         printk("slirp_setup: truncating slirp arguments\n");
  90                         break;
  91                 }
  92                 init->argw.argv[i++] = str;
  93                 while(*str && *str!=',') {
  94                         if(*str=='_') *str=' ';
  95                         str++;
  96                 }
  97                 if(*str!=',')
  98                         break;
  99                 *str++='\0';
 100         } while(1);
 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(1);
 119 }
 120
 121 __initcall(register_slirp);
 122
 123 /*
 124  * Overrides for Emacs so that we follow Linus's tabbing style.
 125  * Emacs will notice this stuff at the end of the file and automatically
 126  * adjust the settings for this buffer only.  This must remain at the end
 127  * of the file.
 128  * ---------------------------------------------------------------------------
 129  * Local variables:
 130  * c-file-style: "linux"
 131  * End:
 132  */