1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <linux/init.h>
7*4882a593Smuzhiyun #include <linux/netdevice.h>
8*4882a593Smuzhiyun #include <net_kern.h>
9*4882a593Smuzhiyun #include "pcap_user.h"
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun struct pcap_init {
12*4882a593Smuzhiyun char *host_if;
13*4882a593Smuzhiyun int promisc;
14*4882a593Smuzhiyun int optimize;
15*4882a593Smuzhiyun char *filter;
16*4882a593Smuzhiyun };
17*4882a593Smuzhiyun
pcap_init(struct net_device * dev,void * data)18*4882a593Smuzhiyun void pcap_init(struct net_device *dev, void *data)
19*4882a593Smuzhiyun {
20*4882a593Smuzhiyun struct uml_net_private *pri;
21*4882a593Smuzhiyun struct pcap_data *ppri;
22*4882a593Smuzhiyun struct pcap_init *init = data;
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun pri = netdev_priv(dev);
25*4882a593Smuzhiyun ppri = (struct pcap_data *) pri->user;
26*4882a593Smuzhiyun ppri->host_if = init->host_if;
27*4882a593Smuzhiyun ppri->promisc = init->promisc;
28*4882a593Smuzhiyun ppri->optimize = init->optimize;
29*4882a593Smuzhiyun ppri->filter = init->filter;
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun printk("pcap backend, host interface %s\n", ppri->host_if);
32*4882a593Smuzhiyun }
33*4882a593Smuzhiyun
pcap_read(int fd,struct sk_buff * skb,struct uml_net_private * lp)34*4882a593Smuzhiyun static int pcap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
35*4882a593Smuzhiyun {
36*4882a593Smuzhiyun return pcap_user_read(fd, skb_mac_header(skb),
37*4882a593Smuzhiyun skb->dev->mtu + ETH_HEADER_OTHER,
38*4882a593Smuzhiyun (struct pcap_data *) &lp->user);
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun
pcap_write(int fd,struct sk_buff * skb,struct uml_net_private * lp)41*4882a593Smuzhiyun static int pcap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
42*4882a593Smuzhiyun {
43*4882a593Smuzhiyun return -EPERM;
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun static const struct net_kern_info pcap_kern_info = {
47*4882a593Smuzhiyun .init = pcap_init,
48*4882a593Smuzhiyun .protocol = eth_protocol,
49*4882a593Smuzhiyun .read = pcap_read,
50*4882a593Smuzhiyun .write = pcap_write,
51*4882a593Smuzhiyun };
52*4882a593Smuzhiyun
pcap_setup(char * str,char ** mac_out,void * data)53*4882a593Smuzhiyun int pcap_setup(char *str, char **mac_out, void *data)
54*4882a593Smuzhiyun {
55*4882a593Smuzhiyun struct pcap_init *init = data;
56*4882a593Smuzhiyun char *remain, *host_if = NULL, *options[2] = { NULL, NULL };
57*4882a593Smuzhiyun int i;
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun *init = ((struct pcap_init)
60*4882a593Smuzhiyun { .host_if = "eth0",
61*4882a593Smuzhiyun .promisc = 1,
62*4882a593Smuzhiyun .optimize = 0,
63*4882a593Smuzhiyun .filter = NULL });
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun remain = split_if_spec(str, &host_if, &init->filter,
66*4882a593Smuzhiyun &options[0], &options[1], mac_out, NULL);
67*4882a593Smuzhiyun if (remain != NULL) {
68*4882a593Smuzhiyun printk(KERN_ERR "pcap_setup - Extra garbage on "
69*4882a593Smuzhiyun "specification : '%s'\n", remain);
70*4882a593Smuzhiyun return 0;
71*4882a593Smuzhiyun }
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun if (host_if != NULL)
74*4882a593Smuzhiyun init->host_if = host_if;
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun for (i = 0; i < ARRAY_SIZE(options); i++) {
77*4882a593Smuzhiyun if (options[i] == NULL)
78*4882a593Smuzhiyun continue;
79*4882a593Smuzhiyun if (!strcmp(options[i], "promisc"))
80*4882a593Smuzhiyun init->promisc = 1;
81*4882a593Smuzhiyun else if (!strcmp(options[i], "nopromisc"))
82*4882a593Smuzhiyun init->promisc = 0;
83*4882a593Smuzhiyun else if (!strcmp(options[i], "optimize"))
84*4882a593Smuzhiyun init->optimize = 1;
85*4882a593Smuzhiyun else if (!strcmp(options[i], "nooptimize"))
86*4882a593Smuzhiyun init->optimize = 0;
87*4882a593Smuzhiyun else {
88*4882a593Smuzhiyun printk(KERN_ERR "pcap_setup : bad option - '%s'\n",
89*4882a593Smuzhiyun options[i]);
90*4882a593Smuzhiyun return 0;
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun }
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun return 1;
95*4882a593Smuzhiyun }
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun static struct transport pcap_transport = {
98*4882a593Smuzhiyun .list = LIST_HEAD_INIT(pcap_transport.list),
99*4882a593Smuzhiyun .name = "pcap",
100*4882a593Smuzhiyun .setup = pcap_setup,
101*4882a593Smuzhiyun .user = &pcap_user_info,
102*4882a593Smuzhiyun .kern = &pcap_kern_info,
103*4882a593Smuzhiyun .private_size = sizeof(struct pcap_data),
104*4882a593Smuzhiyun .setup_size = sizeof(struct pcap_init),
105*4882a593Smuzhiyun };
106*4882a593Smuzhiyun
register_pcap(void)107*4882a593Smuzhiyun static int register_pcap(void)
108*4882a593Smuzhiyun {
109*4882a593Smuzhiyun register_transport(&pcap_transport);
110*4882a593Smuzhiyun return 0;
111*4882a593Smuzhiyun }
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun late_initcall(register_pcap);
114