arch/um/drivers/slip_kern.c

   1 #include "linux/config.h"
   2 #include "linux/kernel.h"
   3 #include "linux/stddef.h"
   4 #include "linux/init.h"
   5 #include "linux/netdevice.h"
   6 #include "linux/if_arp.h"
   7 #include "net_kern.h"
   8 #include "net_user.h"
   9 #include "kern.h"
  10 #include "slip.h"
  11
  12 struct slip_init {
  13         char *gate_addr;
  14 };
  15
  16 void slip_init(struct net_device *dev, void *data)
  17 {
  18         struct uml_net_private *private;
  19         struct slip_data *spri;
  20         struct slip_init *init = data;
  21
  22         private = dev->priv;
  23         spri = (struct slip_data *) private->user;
  24
  25         memset(spri->name, 0, sizeof(spri->name));
  26         spri->addr = NULL;
  27         spri->gate_addr = init->gate_addr;
  28         spri->slave = -1;
  29         spri->dev = dev;
  30
  31         slip_proto_init(&spri->slip);
  32
  33         dev->init = NULL;
  34         dev->header_cache_update = NULL;
  35         dev->hard_header_cache = NULL;
  36         dev->hard_header = NULL;
  37         dev->hard_header_len = 0;
  38         dev->addr_len = 0;
  39         dev->type = ARPHRD_SLIP;
  40         dev->tx_queue_len = 256;
  41         dev->flags = IFF_NOARP;
  42         printk("SLIP backend - SLIP IP = %s\n", spri->gate_addr);
  43 }
  44
  45 static unsigned short slip_protocol(struct sk_buff *skbuff)
  46 {
  47         return(htons(ETH_P_IP));
  48 }
  49
  50 static int slip_read(int fd, struct sk_buff **skb,
  51                        struct uml_net_private *lp)
  52 {
  53         return(slip_user_read(fd, (*skb)->mac.raw, (*skb)->dev->mtu,
  54                               (struct slip_data *) &lp->user));
  55 }
  56
  57 static int slip_write(int fd, struct sk_buff **skb,
  58                       struct uml_net_private *lp)
  59 {
  60         return(slip_user_write(fd, (*skb)->data, (*skb)->len,
  61                                (struct slip_data *) &lp->user));
  62 }
  63
  64 const struct net_kern_info slip_kern_info = {
  65         .init                   = slip_init,
  66         .protocol               = slip_protocol,
  67         .read                   = slip_read,
  68         .write                  = slip_write,
  69 };
  70
  71 static int slip_setup(char *str, char **mac_out, void *data)
  72 {
  73         struct slip_init *init = data;
  74
  75         *init = ((struct slip_init)
  76                 { .gate_addr            = NULL });
  77
  78         if(str[0] != '\0')
  79                 init->gate_addr = str;
  80         return(1);
  81 }
  82
  83 static struct transport slip_transport = {
  84         .list           = LIST_HEAD_INIT(slip_transport.list),
  85         .name           = "slip",
  86         .setup          = slip_setup,
  87         .user           = &slip_user_info,
  88         .kern           = &slip_kern_info,
  89         .private_size   = sizeof(struct slip_data),
  90         .setup_size     = sizeof(struct slip_init),
  91 };
  92
  93 static int register_slip(void)
  94 {
  95         register_transport(&slip_transport);
  96         return 0;
  97 }
  98
  99 __initcall(register_slip);