arch/um/drivers/pcap_kern.c

   1 /*
   2  * Copyright (C) 2002 Jeff Dike <jdike@karaya.com>
   3  * Licensed under the GPL.
   4  */
   5
   6 #include "linux/init.h"
   7 #include "linux/netdevice.h"
   8 #include "linux/etherdevice.h"
   9 #include "net_kern.h"
  10 #include "net_user.h"
  11 #include "pcap_user.h"
  12
  13 struct pcap_init {
  14         char *host_if;
  15         int promisc;
  16         int optimize;
  17         char *filter;
  18 };
  19
  20 void pcap_init(struct net_device *dev, void *data)
  21 {
  22         struct uml_net_private *pri;
  23         struct pcap_data *ppri;
  24         struct pcap_init *init = data;
  25
  26         pri = dev->priv;
  27         ppri = (struct pcap_data *) pri->user;
  28         ppri->host_if = init->host_if;
  29         ppri->promisc = init->promisc;
  30         ppri->optimize = init->optimize;
  31         ppri->filter = init->filter;
  32 }
  33
  34 static int pcap_read(int fd, struct sk_buff **skb,
  35                        struct uml_net_private *lp)
  36 {
  37         *skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
  38         if(*skb == NULL) return(-ENOMEM);
  39         return(pcap_user_read(fd, skb_mac_header(*skb),
  40                               (*skb)->dev->mtu + ETH_HEADER_OTHER,
  41                               (struct pcap_data *) &lp->user));
  42 }
  43
  44 static int pcap_write(int fd, struct sk_buff **skb, struct uml_net_private *lp)
  45 {
  46         return(-EPERM);
  47 }
  48
  49 static const struct net_kern_info pcap_kern_info = {
  50         .init                   = pcap_init,
  51         .protocol               = eth_protocol,
  52         .read                   = pcap_read,
  53         .write                  = pcap_write,
  54 };
  55
  56 int pcap_setup(char *str, char **mac_out, void *data)
  57 {
  58         struct pcap_init *init = data;
  59         char *remain, *host_if = NULL, *options[2] = { NULL, NULL };
  60         int i;
  61
  62         *init = ((struct pcap_init)
  63                 { .host_if      = "eth0",
  64                   .promisc      = 1,
  65                   .optimize     = 0,
  66                   .filter       = NULL });
  67
  68         remain = split_if_spec(str, &host_if, &init->filter,
  69                                &options[0], &options[1], NULL);
  70         if(remain != NULL){
  71                 printk(KERN_ERR "pcap_setup - Extra garbage on "
  72                        "specification : '%s'\n", remain);
  73                 return(0);
  74         }
  75
  76         if(host_if != NULL)
  77                 init->host_if = host_if;
  78
  79         for(i = 0; i < ARRAY_SIZE(options); i++){
  80                 if(options[i] == NULL)
  81                         continue;
  82                 if(!strcmp(options[i], "promisc"))
  83                         init->promisc = 1;
  84                 else if(!strcmp(options[i], "nopromisc"))
  85                         init->promisc = 0;
  86                 else if(!strcmp(options[i], "optimize"))
  87                         init->optimize = 1;
  88                 else if(!strcmp(options[i], "nooptimize"))
  89                         init->optimize = 0;
  90                 else printk("pcap_setup : bad option - '%s'\n", options[i]);
  91         }
  92
  93         return(1);
  94 }
  95
  96 static struct transport pcap_transport = {
  97         .list           = LIST_HEAD_INIT(pcap_transport.list),
  98         .name           = "pcap",
  99         .setup          = pcap_setup,
 100         .user           = &pcap_user_info,
 101         .kern           = &pcap_kern_info,
 102         .private_size   = sizeof(struct pcap_data),
 103         .setup_size     = sizeof(struct pcap_init),
 104 };
 105
 106 static int register_pcap(void)
 107 {
 108         register_transport(&pcap_transport);
 109         return 0;
 110 }
 111
 112 late_initcall(register_pcap);