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Linux/arch/um/drivers/slirp_kern.c

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

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