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
pcap_init(struct net_device * dev,void * data)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 = 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
pcap_read(int fd,struct sk_buff * skb,struct uml_net_private * lp)34 static 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
pcap_write(int fd,struct sk_buff * skb,struct uml_net_private * lp)41 static int pcap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
42 {
43 return -EPERM;
44 }
45
46 static 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
pcap_setup(char * str,char ** mac_out,void * data)53 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
97 static 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
register_pcap(void)107 static int register_pcap(void)
108 {
109 register_transport(&pcap_transport);
110 return 0;
111 }
112
113 late_initcall(register_pcap);
114