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
 11struct pcap_init {
 12	char *host_if;
 13	int promisc;
 14	int optimize;
 15	char *filter;
 16};
 17
 18void 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 = netdev_priv(dev);
 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
 34static int pcap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
 35{
 36	return pcap_user_read(fd, skb_mac_header(skb),
 37			      skb->dev->mtu + ETH_HEADER_OTHER,
 38			      (struct pcap_data *) &lp->user);
 39}
 40
 41static int pcap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
 42{
 43	return -EPERM;
 44}
 45
 46static const struct net_kern_info pcap_kern_info = {
 47	.init			= pcap_init,
 48	.protocol		= eth_protocol,
 49	.read			= pcap_read,
 50	.write			= pcap_write,
 51};
 52
 53int pcap_setup(char *str, char **mac_out, void *data)
 54{
 55	struct pcap_init *init = data;
 56	char *remain, *host_if = NULL, *options[2] = { NULL, NULL };
 57	int i;
 58
 59	*init = ((struct pcap_init)
 60		{ .host_if 	= "eth0",
 61		  .promisc 	= 1,
 62		  .optimize 	= 0,
 63		  .filter 	= NULL });
 64
 65	remain = split_if_spec(str, &host_if, &init->filter,
 66			       &options[0], &options[1], mac_out, NULL);
 67	if (remain != NULL) {
 68		printk(KERN_ERR "pcap_setup - Extra garbage on "
 69		       "specification : '%s'\n", remain);
 70		return 0;
 71	}
 72
 73	if (host_if != NULL)
 74		init->host_if = host_if;
 75
 76	for (i = 0; i < ARRAY_SIZE(options); i++) {
 77		if (options[i] == NULL)
 78			continue;
 79		if (!strcmp(options[i], "promisc"))
 80			init->promisc = 1;
 81		else if (!strcmp(options[i], "nopromisc"))
 82			init->promisc = 0;
 83		else if (!strcmp(options[i], "optimize"))
 84			init->optimize = 1;
 85		else if (!strcmp(options[i], "nooptimize"))
 86			init->optimize = 0;
 87		else {
 88			printk(KERN_ERR "pcap_setup : bad option - '%s'\n",
 89			       options[i]);
 90			return 0;
 91		}
 92	}
 93
 94	return 1;
 95}
 96
 97static struct transport pcap_transport = {
 98	.list 		= LIST_HEAD_INIT(pcap_transport.list),
 99	.name 		= "pcap",
100	.setup  	= pcap_setup,
101	.user 		= &pcap_user_info,
102	.kern 		= &pcap_kern_info,
103	.private_size 	= sizeof(struct pcap_data),
104	.setup_size 	= sizeof(struct pcap_init),
105};
106
107static int register_pcap(void)
108{
109	register_transport(&pcap_transport);
110	return 0;
111}
112
113late_initcall(register_pcap);