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         printk("pcap backend, host interface %s\n", ppri->host_if);
  34 }
  35
  36 static int pcap_read(int fd, struct sk_buff **skb,
  37                        struct uml_net_private *lp)
  38 {
  39         *skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
  40         if(*skb == NULL)
  41                 return -ENOMEM;
  42
  43         return pcap_user_read(fd, skb_mac_header(*skb),
  44                               (*skb)->dev->mtu + ETH_HEADER_OTHER,
  45                               (struct pcap_data *) &lp->user);
  46 }
  47
  48 static int pcap_write(int fd, struct sk_buff **skb, struct uml_net_private *lp)
  49 {
  50         return -EPERM;
  51 }
  52
  53 static const struct net_kern_info pcap_kern_info = {
  54         .init                   = pcap_init,
  55         .protocol               = eth_protocol,
  56         .read                   = pcap_read,
  57         .write                  = pcap_write,
  58 };
  59
  60 int pcap_setup(char *str, char **mac_out, void *data)
  61 {
  62         struct pcap_init *init = data;
  63         char *remain, *host_if = NULL, *options[2] = { NULL, NULL };
  64         int i;
  65
  66         *init = ((struct pcap_init)
  67                 { .host_if      = "eth0",
  68                   .promisc      = 1,
  69                   .optimize     = 0,
  70                   .filter       = NULL });
  71
  72         remain = split_if_spec(str, &host_if, &init->filter,
  73                                &options[0], &options[1], mac_out, NULL);
  74         if(remain != NULL){
  75                 printk(KERN_ERR "pcap_setup - Extra garbage on "
  76                        "specification : '%s'\n", remain);
  77                 return 0;
  78         }
  79
  80         if(host_if != NULL)
  81                 init->host_if = host_if;
  82
  83         for(i = 0; i < ARRAY_SIZE(options); i++){
  84                 if(options[i] == NULL)
  85                         continue;
  86                 if(!strcmp(options[i], "promisc"))
  87                         init->promisc = 1;
  88                 else if(!strcmp(options[i], "nopromisc"))
  89                         init->promisc = 0;
  90                 else if(!strcmp(options[i], "optimize"))
  91                         init->optimize = 1;
  92                 else if(!strcmp(options[i], "nooptimize"))
  93                         init->optimize = 0;
  94                 else {
  95                         printk("pcap_setup : bad option - '%s'\n", options[i]);
  96                         return 0;
  97                 }
  98         }
  99
 100         return 1;
 101 }
 102
 103 static struct transport pcap_transport = {
 104         .list           = LIST_HEAD_INIT(pcap_transport.list),
 105         .name           = "pcap",
 106         .setup          = pcap_setup,
 107         .user           = &pcap_user_info,
 108         .kern           = &pcap_kern_info,
 109         .private_size   = sizeof(struct pcap_data),
 110         .setup_size     = sizeof(struct pcap_init),
 111 };
 112
 113 static int register_pcap(void)
 114 {
 115         register_transport(&pcap_transport);
 116         return 0;
 117 }
 118
 119 late_initcall(register_pcap);