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pcap_kern.c

/*
 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL.
 */

#include "linux/init.h"
#include <linux/netdevice.h>
#include "net_kern.h"
#include "pcap_user.h"

struct pcap_init {
      char *host_if;
      int promisc;
      int optimize;
      char *filter;
};

void pcap_init(struct net_device *dev, void *data)
{
      struct uml_net_private *pri;
      struct pcap_data *ppri;
      struct pcap_init *init = data;

      pri = dev->priv;
      ppri = (struct pcap_data *) pri->user;
      ppri->host_if = init->host_if;
      ppri->promisc = init->promisc;
      ppri->optimize = init->optimize;
      ppri->filter = init->filter;

      printk("pcap backend, host interface %s\n", ppri->host_if);
}

static int pcap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
      return pcap_user_read(fd, skb_mac_header(skb),
                        skb->dev->mtu + ETH_HEADER_OTHER,
                        (struct pcap_data *) &lp->user);
}

static int pcap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
      return -EPERM;
}

static const struct net_kern_info pcap_kern_info = {
      .init             = pcap_init,
      .protocol         = eth_protocol,
      .read             = pcap_read,
      .write                  = pcap_write,
};

int pcap_setup(char *str, char **mac_out, void *data)
{
      struct pcap_init *init = data;
      char *remain, *host_if = NULL, *options[2] = { NULL, NULL };
      int i;

      *init = ((struct pcap_init)
            { .host_if  = "eth0",
              .promisc  = 1,
              .optimize       = 0,
              .filter   = NULL });

      remain = split_if_spec(str, &host_if, &init->filter,
                         &options[0], &options[1], mac_out, NULL);
      if (remain != NULL) {
            printk(KERN_ERR "pcap_setup - Extra garbage on "
                   "specification : '%s'\n", remain);
            return 0;
      }

      if (host_if != NULL)
            init->host_if = host_if;

      for (i = 0; i < ARRAY_SIZE(options); i++) {
            if (options[i] == NULL)
                  continue;
            if (!strcmp(options[i], "promisc"))
                  init->promisc = 1;
            else if (!strcmp(options[i], "nopromisc"))
                  init->promisc = 0;
            else if (!strcmp(options[i], "optimize"))
                  init->optimize = 1;
            else if (!strcmp(options[i], "nooptimize"))
                  init->optimize = 0;
            else {
                  printk(KERN_ERR "pcap_setup : bad option - '%s'\n",
                         options[i]);
                  return 0;
            }
      }

      return 1;
}

static struct transport pcap_transport = {
      .list             = LIST_HEAD_INIT(pcap_transport.list),
      .name             = "pcap",
      .setup      = pcap_setup,
      .user             = &pcap_user_info,
      .kern             = &pcap_kern_info,
      .private_size     = sizeof(struct pcap_data),
      .setup_size       = sizeof(struct pcap_init),
};

static int register_pcap(void)
{
      register_transport(&pcap_transport);
      return 0;
}

late_initcall(register_pcap);

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