arch/um/drivers/pcap_kern.c

   1 /*
   2  * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3  * Licensed under the GPL.
   4  */
   5
   6 #include "linux/init.h"
   7 #include <linux/netdevice.h>
   8 #include "net_kern.h"
   9 #include "pcap_user.h"
  10
  11 struct pcap_init {
  12         char *host_if;
  13         int promisc;
  14         int optimize;
  15         char *filter;
  16 };
  17
  18 void pcap_init(struct net_device *dev, void *data)
  19 {
  20         struct uml_net_private *pri;
  21         struct pcap_data *ppri;
  22         struct pcap_init *init = data;
  23
  24         pri = dev->priv;
  25         ppri = (struct pcap_data *) pri->user;
  26         ppri->host_if = init->host_if;
  27         ppri->promisc = init->promisc;
  28         ppri->optimize = init->optimize;
  29         ppri->filter = init->filter;
  30
  31         printk("pcap backend, host interface %s\n", ppri->host_if);
  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)
  39                 return -ENOMEM;
  40
  41         return pcap_user_read(fd, skb_mac_header(*skb),
  42                               (*skb)->dev->mtu + ETH_HEADER_OTHER,
  43                               (struct pcap_data *) &lp->user);
  44 }
  45
  46 static int pcap_write(int fd, struct sk_buff **skb, struct uml_net_private *lp)
  47 {
  48         return -EPERM;
  49 }
  50
  51 static const struct net_kern_info pcap_kern_info = {
  52         .init                   = pcap_init,
  53         .protocol               = eth_protocol,
  54         .read                   = pcap_read,
  55         .write                  = pcap_write,
  56 };
  57
  58 int pcap_setup(char *str, char **mac_out, void *data)
  59 {
  60         struct pcap_init *init = data;
  61         char *remain, *host_if = NULL, *options[2] = { NULL, NULL };
  62         int i;
  63
  64         *init = ((struct pcap_init)
  65                 { .host_if      = "eth0",
  66                   .promisc      = 1,
  67                   .optimize     = 0,
  68                   .filter       = NULL });
  69
  70         remain = split_if_spec(str, &host_if, &init->filter,
  71                                &options[0], &options[1], mac_out, NULL);
  72         if (remain != NULL) {
  73                 printk(KERN_ERR "pcap_setup - Extra garbage on "
  74                        "specification : '%s'\n", remain);
  75                 return 0;
  76         }
  77
  78         if (host_if != NULL)
  79                 init->host_if = host_if;
  80
  81         for (i = 0; i < ARRAY_SIZE(options); i++) {
  82                 if (options[i] == NULL)
  83                         continue;
  84                 if (!strcmp(options[i], "promisc"))
  85                         init->promisc = 1;
  86                 else if (!strcmp(options[i], "nopromisc"))
  87                         init->promisc = 0;
  88                 else if (!strcmp(options[i], "optimize"))
  89                         init->optimize = 1;
  90                 else if (!strcmp(options[i], "nooptimize"))
  91                         init->optimize = 0;
  92                 else {
  93                         printk(KERN_ERR "pcap_setup : bad option - '%s'\n",
  94                                options[i]);
  95                         return 0;
  96                 }
  97         }
  98
  99         return 1;
 100 }
 101
 102 static struct transport pcap_transport = {
 103         .list           = LIST_HEAD_INIT(pcap_transport.list),
 104         .name           = "pcap",
 105         .setup          = pcap_setup,
 106         .user           = &pcap_user_info,
 107         .kern           = &pcap_kern_info,
 108         .private_size   = sizeof(struct pcap_data),
 109         .setup_size     = sizeof(struct pcap_init),
 110 };
 111
 112 static int register_pcap(void)
 113 {
 114         register_transport(&pcap_transport);
 115         return 0;
 116 }
 117
 118 late_initcall(register_pcap);