1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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
18static void pcap_init_kern(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_kern,
48	.protocol		= eth_protocol,
49	.read			= pcap_read,
50	.write			= pcap_write,
51};
52
53static int 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);
114