1 |
cebix |
1.1 |
/* |
2 |
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* sheep_net.c - Linux driver for SheepShaver/Basilisk II networking (access to raw Ethernet packets) |
3 |
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* |
4 |
cebix |
1.11 |
* sheep_net (C) 1999-2004 Mar"c" Hellwig and Christian Bauer |
5 |
cebix |
1.1 |
* |
6 |
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* This program is free software; you can redistribute it and/or modify |
7 |
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* it under the terms of the GNU General Public License as published by |
8 |
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* the Free Software Foundation; either version 2 of the License, or |
9 |
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* (at your option) any later version. |
10 |
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* |
11 |
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* This program is distributed in the hope that it will be useful, |
12 |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 |
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* GNU General Public License for more details. |
15 |
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* |
16 |
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* You should have received a copy of the GNU General Public License |
17 |
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* along with this program; if not, write to the Free Software |
18 |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 |
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*/ |
20 |
asvitkine |
1.16 |
/* modversions.h redefines kernel symbols. Now include other headers */ |
21 |
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#include <linux/kernel.h> |
22 |
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#include <linux/module.h> |
23 |
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#include <linux/version.h> |
24 |
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25 |
asvitkine |
1.17 |
|
26 |
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35) |
27 |
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#define LINUX_26_35 |
28 |
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#endif |
29 |
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30 |
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36) |
31 |
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#define LINUX_26_36 |
32 |
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#endif |
33 |
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|
34 |
asvitkine |
1.16 |
/* Compatibility glue */ |
35 |
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,30) |
36 |
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#define LINUX_26_30 |
37 |
asvitkine |
1.17 |
|
38 |
asvitkine |
1.16 |
#else |
39 |
cebix |
1.1 |
|
40 |
cebix |
1.10 |
/* determine whether to use checksummed versions of kernel symbols */ |
41 |
asvitkine |
1.15 |
/*** |
42 |
cebix |
1.10 |
#include <linux/config.h> |
43 |
asvitkine |
1.15 |
***/ |
44 |
|
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#include "config.h" |
45 |
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#include <linux/autoconf.h> |
46 |
cebix |
1.9 |
|
47 |
cebix |
1.10 |
#if defined(CONFIG_MODVERSIONS) && !defined(MODVERSIONS) |
48 |
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#define MODVERSIONS |
49 |
cebix |
1.9 |
#endif |
50 |
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|
51 |
cebix |
1.10 |
#if defined(MODVERSIONS) |
52 |
cebix |
1.9 |
#include <linux/modversions.h> |
53 |
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#endif |
54 |
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|
55 |
asvitkine |
1.16 |
#endif |
56 |
cebix |
1.9 |
|
57 |
cebix |
1.10 |
#include <linux/types.h> |
58 |
cebix |
1.1 |
#include <linux/miscdevice.h> |
59 |
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#include <linux/netdevice.h> |
60 |
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#include <linux/etherdevice.h> |
61 |
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#include <linux/if_ether.h> |
62 |
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#include <linux/if_arp.h> |
63 |
cebix |
1.7 |
#include <linux/fs.h> |
64 |
cebix |
1.1 |
#include <linux/poll.h> |
65 |
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#include <linux/init.h> |
66 |
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#include <net/sock.h> |
67 |
cebix |
1.7 |
#include <asm/uaccess.h> |
68 |
gbeauche |
1.12 |
#include <asm/ioctls.h> |
69 |
cebix |
1.4 |
#include <net/arp.h> |
70 |
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#include <net/ip.h> |
71 |
asvitkine |
1.15 |
#include <net/raw.h> |
72 |
cebix |
1.7 |
#include <linux/in.h> |
73 |
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#include <linux/wait.h> |
74 |
cebix |
1.1 |
|
75 |
cebix |
1.5 |
MODULE_AUTHOR("Christian Bauer"); |
76 |
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MODULE_DESCRIPTION("Pseudo ethernet device for emulators"); |
77 |
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|
78 |
cebix |
1.4 |
/* Compatibility glue */ |
79 |
gbeauche |
1.12 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0) |
80 |
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#define LINUX_26 |
81 |
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#endif |
82 |
cebix |
1.4 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0) |
83 |
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#define LINUX_24 |
84 |
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#else |
85 |
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#define net_device device |
86 |
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typedef struct wait_queue *wait_queue_head_t; |
87 |
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#define init_waitqueue_head(x) *(x)=NULL |
88 |
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#endif |
89 |
gbeauche |
1.13 |
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,9) |
90 |
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#define eth_hdr(skb) (skb)->mac.ethernet |
91 |
asvitkine |
1.15 |
#define skb_mac_header(skb) (skb)->mac.raw |
92 |
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#define ipip_hdr(skb) (skb)->h.ipiph |
93 |
gbeauche |
1.13 |
#endif |
94 |
cebix |
1.4 |
|
95 |
gbeauche |
1.12 |
#ifdef LINUX_26 |
96 |
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#define skt_set_dead(skt) do {} while(0) |
97 |
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#define wmem_alloc sk_wmem_alloc |
98 |
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#else |
99 |
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#define skt_set_dead(skt) (skt)->dead = 1 |
100 |
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#endif |
101 |
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102 |
cebix |
1.1 |
#define DEBUG 0 |
103 |
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104 |
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#define bug printk |
105 |
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#if DEBUG |
106 |
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#define D(x) (x); |
107 |
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#else |
108 |
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#define D(x) ; |
109 |
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#endif |
110 |
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111 |
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112 |
cebix |
1.4 |
/* Constants */ |
113 |
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#define SHEEP_NET_MINOR 198 /* Driver minor number */ |
114 |
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#define MAX_QUEUE 32 /* Maximum number of packets in queue */ |
115 |
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#define PROT_MAGIC 1520 /* Our "magic" protocol type */ |
116 |
cebix |
1.1 |
|
117 |
cebix |
1.4 |
#define ETH_ADDR_MULTICAST 0x1 |
118 |
cebix |
1.7 |
#define ETH_ADDR_LOCALLY_DEFINED 0x02 |
119 |
cebix |
1.4 |
|
120 |
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#define SIOC_MOL_GET_IPFILTER SIOCDEVPRIVATE |
121 |
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#define SIOC_MOL_SET_IPFILTER (SIOCDEVPRIVATE + 1) |
122 |
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123 |
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/* Prototypes */ |
124 |
cebix |
1.1 |
static int sheep_net_open(struct inode *inode, struct file *f); |
125 |
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static int sheep_net_release(struct inode *inode, struct file *f); |
126 |
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static ssize_t sheep_net_read(struct file *f, char *buf, size_t count, loff_t *off); |
127 |
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static ssize_t sheep_net_write(struct file *f, const char *buf, size_t count, loff_t *off); |
128 |
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static unsigned int sheep_net_poll(struct file *f, struct poll_table_struct *wait); |
129 |
asvitkine |
1.17 |
#ifdef LINUX_26_36 |
130 |
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static long sheep_net_ioctl(struct file *f, unsigned int code, unsigned long arg); |
131 |
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#else |
132 |
cebix |
1.1 |
static int sheep_net_ioctl(struct inode *inode, struct file *f, unsigned int code, unsigned long arg); |
133 |
asvitkine |
1.17 |
#endif |
134 |
asvitkine |
1.15 |
#ifdef LINUX_26 |
135 |
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static int sheep_net_receiver(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *foo); |
136 |
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#else |
137 |
cebix |
1.4 |
static int sheep_net_receiver(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt); |
138 |
asvitkine |
1.15 |
#endif |
139 |
cebix |
1.1 |
|
140 |
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/* |
141 |
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* Driver private variables |
142 |
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*/ |
143 |
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144 |
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struct SheepVars { |
145 |
gbeauche |
1.12 |
/* IMPORTANT: the packet_type struct must go first. It no longer |
146 |
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(2.6) contains * a data field so we typecast to get the SheepVars |
147 |
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struct */ |
148 |
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struct packet_type pt; /* Receiver packet type */ |
149 |
cebix |
1.4 |
struct net_device *ether; /* The Ethernet device we're attached to */ |
150 |
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struct sock *skt; /* Socket for communication with Ethernet card */ |
151 |
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struct sk_buff_head queue; /* Receiver packet queue */ |
152 |
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wait_queue_head_t wait; /* Wait queue for blocking read operations */ |
153 |
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u32 ipfilter; /* Only receive IP packets destined for this address (host byte order) */ |
154 |
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char eth_addr[6]; /* Hardware address of the Ethernet card */ |
155 |
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char fake_addr[6]; /* Local faked hardware address (what SheepShaver sees) */ |
156 |
cebix |
1.1 |
}; |
157 |
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158 |
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159 |
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/* |
160 |
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* file_operations structure - has function pointers to the |
161 |
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* various entry points for device operations |
162 |
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*/ |
163 |
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164 |
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static struct file_operations sheep_net_fops = { |
165 |
gbeauche |
1.12 |
.owner = THIS_MODULE, |
166 |
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.read = sheep_net_read, |
167 |
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.write = sheep_net_write, |
168 |
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.poll = sheep_net_poll, |
169 |
asvitkine |
1.17 |
#ifdef LINUX_26_36 |
170 |
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.unlocked_ioctl = sheep_net_ioctl, |
171 |
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#else |
172 |
gbeauche |
1.12 |
.ioctl = sheep_net_ioctl, |
173 |
asvitkine |
1.17 |
#endif |
174 |
gbeauche |
1.12 |
.open = sheep_net_open, |
175 |
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.release = sheep_net_release, |
176 |
cebix |
1.1 |
}; |
177 |
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178 |
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179 |
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/* |
180 |
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* miscdevice structure for driver initialization |
181 |
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*/ |
182 |
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183 |
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static struct miscdevice sheep_net_device = { |
184 |
gbeauche |
1.12 |
.minor = SHEEP_NET_MINOR, /* minor number */ |
185 |
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.name = "sheep_net", /* name */ |
186 |
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.fops = &sheep_net_fops |
187 |
cebix |
1.1 |
}; |
188 |
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189 |
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190 |
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/* |
191 |
asvitkine |
1.15 |
* fake protocol to use a common socket |
192 |
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*/ |
193 |
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static struct proto sheep_proto = { |
194 |
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.name = "SHEEP", |
195 |
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.owner = THIS_MODULE, |
196 |
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.obj_size = sizeof(struct sock), |
197 |
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}; |
198 |
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199 |
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200 |
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/* |
201 |
cebix |
1.1 |
* Initialize module |
202 |
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*/ |
203 |
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204 |
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int init_module(void) |
205 |
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{ |
206 |
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int ret; |
207 |
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208 |
cebix |
1.4 |
/* Register driver */ |
209 |
cebix |
1.1 |
ret = misc_register(&sheep_net_device); |
210 |
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D(bug("Sheep net driver installed\n")); |
211 |
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return ret; |
212 |
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} |
213 |
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214 |
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215 |
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/* |
216 |
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* Deinitialize module |
217 |
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*/ |
218 |
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|
219 |
gbeauche |
1.12 |
void cleanup_module(void) |
220 |
cebix |
1.1 |
{ |
221 |
cebix |
1.4 |
/* Unregister driver */ |
222 |
gbeauche |
1.12 |
misc_deregister(&sheep_net_device); |
223 |
cebix |
1.1 |
D(bug("Sheep net driver removed\n")); |
224 |
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} |
225 |
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226 |
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227 |
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/* |
228 |
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* Driver open() function |
229 |
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*/ |
230 |
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231 |
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static int sheep_net_open(struct inode *inode, struct file *f) |
232 |
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{ |
233 |
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struct SheepVars *v; |
234 |
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D(bug("sheep_net: open\n")); |
235 |
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|
236 |
cebix |
1.4 |
/* Must be opened with read permissions */ |
237 |
cebix |
1.1 |
if ((f->f_flags & O_ACCMODE) == O_WRONLY) |
238 |
|
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return -EPERM; |
239 |
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|
240 |
cebix |
1.4 |
/* Allocate private variables */ |
241 |
asvitkine |
1.15 |
v = (struct SheepVars *)kmalloc(sizeof(struct SheepVars), GFP_USER); |
242 |
cebix |
1.1 |
if (v == NULL) |
243 |
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return -ENOMEM; |
244 |
asvitkine |
1.15 |
|
245 |
asvitkine |
1.16 |
#ifndef LINUX_26_30 |
246 |
asvitkine |
1.15 |
lock_kernel(); |
247 |
asvitkine |
1.16 |
#endif |
248 |
cebix |
1.1 |
memset(v, 0, sizeof(struct SheepVars)); |
249 |
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skb_queue_head_init(&v->queue); |
250 |
cebix |
1.4 |
init_waitqueue_head(&v->wait); |
251 |
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v->fake_addr[0] = 0xfe; |
252 |
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v->fake_addr[1] = 0xfd; |
253 |
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v->fake_addr[2] = 0xde; |
254 |
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v->fake_addr[3] = 0xad; |
255 |
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v->fake_addr[4] = 0xbe; |
256 |
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v->fake_addr[5] = 0xef; |
257 |
cebix |
1.1 |
|
258 |
asvitkine |
1.15 |
/* Put our stuff where we will be able to find it later */ |
259 |
|
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f->private_data = (void *)v; |
260 |
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|
261 |
cebix |
1.4 |
/* Yes, we're open */ |
262 |
gbeauche |
1.12 |
#ifndef LINUX_26 |
263 |
cebix |
1.1 |
MOD_INC_USE_COUNT; |
264 |
gbeauche |
1.12 |
#endif |
265 |
asvitkine |
1.16 |
#ifndef LINUX_26_30 |
266 |
asvitkine |
1.15 |
unlock_kernel(); |
267 |
asvitkine |
1.16 |
#endif |
268 |
cebix |
1.1 |
return 0; |
269 |
|
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} |
270 |
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271 |
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272 |
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/* |
273 |
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* Driver release() function |
274 |
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*/ |
275 |
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276 |
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static int sheep_net_release(struct inode *inode, struct file *f) |
277 |
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{ |
278 |
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struct SheepVars *v = (struct SheepVars *)f->private_data; |
279 |
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struct sk_buff *skb; |
280 |
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D(bug("sheep_net: close\n")); |
281 |
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|
282 |
cebix |
1.4 |
/* Detach from Ethernet card */ |
283 |
cebix |
1.1 |
if (v->ether) { |
284 |
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dev_remove_pack(&v->pt); |
285 |
|
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sk_free(v->skt); |
286 |
|
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v->skt = NULL; |
287 |
cebix |
1.4 |
#ifdef LINUX_24 |
288 |
|
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dev_put( v->ether ); |
289 |
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#endif |
290 |
cebix |
1.1 |
v->ether = NULL; |
291 |
|
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} |
292 |
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|
293 |
cebix |
1.4 |
/* Empty packet queue */ |
294 |
cebix |
1.1 |
while ((skb = skb_dequeue(&v->queue)) != NULL) |
295 |
|
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dev_kfree_skb(skb); |
296 |
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|
297 |
cebix |
1.4 |
/* Free private variables */ |
298 |
cebix |
1.1 |
kfree(v); |
299 |
|
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|
300 |
cebix |
1.4 |
/* Sorry, we're closed */ |
301 |
gbeauche |
1.12 |
#ifndef LINUX_26 |
302 |
cebix |
1.1 |
MOD_DEC_USE_COUNT; |
303 |
gbeauche |
1.12 |
#endif |
304 |
cebix |
1.1 |
return 0; |
305 |
|
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} |
306 |
|
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|
307 |
|
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|
308 |
|
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/* |
309 |
cebix |
1.4 |
* Check whether an Ethernet address is the local (attached) one or |
310 |
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* the fake one |
311 |
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*/ |
312 |
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|
313 |
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static inline int is_local_addr(struct SheepVars *v, void *a) |
314 |
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{ |
315 |
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return memcmp(a, v->eth_addr, 6) == 0; |
316 |
|
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} |
317 |
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|
318 |
|
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static inline int is_fake_addr(struct SheepVars *v, void *a) |
319 |
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{ |
320 |
|
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return memcmp(a, v->fake_addr, 6) == 0; |
321 |
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} |
322 |
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323 |
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|
324 |
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/* |
325 |
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* Outgoing packet. Replace the fake enet addr with the real local one. |
326 |
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*/ |
327 |
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|
328 |
|
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static inline void do_demasq(struct SheepVars *v, u8 *p) |
329 |
|
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{ |
330 |
|
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memcpy(p, v->eth_addr, 6); |
331 |
|
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} |
332 |
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|
333 |
|
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static void demasquerade(struct SheepVars *v, struct sk_buff *skb) |
334 |
|
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{ |
335 |
asvitkine |
1.15 |
u8 *p = skb_mac_header(skb); |
336 |
cebix |
1.4 |
int proto = (p[12] << 8) | p[13]; |
337 |
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|
338 |
|
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do_demasq(v, p + 6); /* source address */ |
339 |
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|
340 |
|
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/* Need to fix ARP packets */ |
341 |
|
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if (proto == ETH_P_ARP) { |
342 |
|
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if (is_fake_addr(v, p + 14 + 8)) /* sender HW-addr */ |
343 |
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do_demasq(v, p + 14 + 8); |
344 |
|
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} |
345 |
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|
346 |
|
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/* ...and AARPs (snap code: 0x00,0x00,0x00,0x80,0xF3) */ |
347 |
|
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if (p[17] == 0 && p[18] == 0 && p[19] == 0 && p[20] == 0x80 && p[21] == 0xf3) { |
348 |
|
|
/* XXX: we should perhaps look for the 802 frame too */ |
349 |
|
|
if (is_fake_addr(v, p + 30)) |
350 |
|
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do_demasq(v, p + 30); /* sender HW-addr */ |
351 |
|
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} |
352 |
|
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} |
353 |
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|
354 |
|
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|
355 |
|
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/* |
356 |
|
|
* Incoming packet. Replace the local enet addr with the fake one. |
357 |
|
|
*/ |
358 |
|
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|
359 |
|
|
static inline void do_masq(struct SheepVars *v, u8 *p) |
360 |
|
|
{ |
361 |
|
|
memcpy(p, v->fake_addr, 6); |
362 |
|
|
} |
363 |
|
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|
364 |
|
|
static void masquerade(struct SheepVars *v, struct sk_buff *skb) |
365 |
|
|
{ |
366 |
asvitkine |
1.15 |
u8 *p = skb_mac_header(skb); |
367 |
cebix |
1.4 |
if (!(p[0] & ETH_ADDR_MULTICAST)) |
368 |
|
|
do_masq(v, p); /* destination address */ |
369 |
|
|
|
370 |
|
|
/* XXX: reverse ARP might need to be fixed */ |
371 |
|
|
} |
372 |
|
|
|
373 |
|
|
|
374 |
|
|
/* |
375 |
cebix |
1.1 |
* Driver read() function |
376 |
|
|
*/ |
377 |
|
|
|
378 |
|
|
static ssize_t sheep_net_read(struct file *f, char *buf, size_t count, loff_t *off) |
379 |
|
|
{ |
380 |
|
|
struct SheepVars *v = (struct SheepVars *)f->private_data; |
381 |
|
|
struct sk_buff *skb; |
382 |
cebix |
1.4 |
|
383 |
cebix |
1.1 |
D(bug("sheep_net: read\n")); |
384 |
|
|
|
385 |
|
|
for (;;) { |
386 |
|
|
|
387 |
cebix |
1.4 |
/* Get next packet from queue */ |
388 |
cebix |
1.1 |
skb = skb_dequeue(&v->queue); |
389 |
|
|
if (skb != NULL || (f->f_flags & O_NONBLOCK)) |
390 |
|
|
break; |
391 |
|
|
|
392 |
cebix |
1.4 |
/* No packet in queue and in blocking mode, so block */ |
393 |
cebix |
1.1 |
interruptible_sleep_on(&v->wait); |
394 |
|
|
|
395 |
cebix |
1.4 |
/* Signal received? Then bail out */ |
396 |
|
|
if (signal_pending(current)) |
397 |
|
|
return -EINTR; |
398 |
cebix |
1.1 |
} |
399 |
|
|
if (skb == NULL) |
400 |
|
|
return -EAGAIN; |
401 |
|
|
|
402 |
cebix |
1.4 |
/* Pass packet to caller */ |
403 |
cebix |
1.1 |
if (count > skb->len) |
404 |
|
|
count = skb->len; |
405 |
|
|
if (copy_to_user(buf, skb->data, count)) |
406 |
|
|
count = -EFAULT; |
407 |
|
|
dev_kfree_skb(skb); |
408 |
|
|
return count; |
409 |
|
|
} |
410 |
|
|
|
411 |
|
|
|
412 |
|
|
/* |
413 |
|
|
* Driver write() function |
414 |
|
|
*/ |
415 |
|
|
|
416 |
|
|
static ssize_t sheep_net_write(struct file *f, const char *buf, size_t count, loff_t *off) |
417 |
|
|
{ |
418 |
|
|
struct SheepVars *v = (struct SheepVars *)f->private_data; |
419 |
|
|
struct sk_buff *skb; |
420 |
|
|
char *p; |
421 |
|
|
D(bug("sheep_net: write\n")); |
422 |
|
|
|
423 |
cebix |
1.4 |
/* Check packet size */ |
424 |
cebix |
1.1 |
if (count < sizeof(struct ethhdr)) |
425 |
|
|
return -EINVAL; |
426 |
cebix |
1.7 |
if (count > 1514) { |
427 |
asvitkine |
1.15 |
printk("sheep_net_write: packet size %ld > 1514\n", count); |
428 |
cebix |
1.1 |
count = 1514; |
429 |
cebix |
1.7 |
} |
430 |
cebix |
1.1 |
|
431 |
cebix |
1.4 |
/* Interface active? */ |
432 |
cebix |
1.1 |
if (v->ether == NULL) |
433 |
|
|
return count; |
434 |
|
|
|
435 |
cebix |
1.4 |
/* Allocate buffer for packet */ |
436 |
cebix |
1.1 |
skb = dev_alloc_skb(count); |
437 |
|
|
if (skb == NULL) |
438 |
|
|
return -ENOBUFS; |
439 |
|
|
|
440 |
cebix |
1.4 |
/* Stuff packet in buffer */ |
441 |
cebix |
1.1 |
p = skb_put(skb, count); |
442 |
|
|
if (copy_from_user(p, buf, count)) { |
443 |
|
|
kfree_skb(skb); |
444 |
|
|
return -EFAULT; |
445 |
|
|
} |
446 |
|
|
|
447 |
cebix |
1.4 |
/* Transmit packet */ |
448 |
cebix |
1.1 |
atomic_add(skb->truesize, &v->skt->wmem_alloc); |
449 |
|
|
skb->sk = v->skt; |
450 |
|
|
skb->dev = v->ether; |
451 |
|
|
skb->priority = 0; |
452 |
asvitkine |
1.15 |
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,9) |
453 |
cebix |
1.1 |
skb->nh.raw = skb->h.raw = skb->data + v->ether->hard_header_len; |
454 |
cebix |
1.4 |
skb->mac.raw = skb->data; |
455 |
asvitkine |
1.15 |
#else |
456 |
|
|
skb_reset_mac_header(skb); |
457 |
|
|
skb_set_transport_header(skb, v->ether->hard_header_len); |
458 |
|
|
skb_set_network_header(skb, v->ether->hard_header_len); |
459 |
|
|
#endif |
460 |
cebix |
1.4 |
|
461 |
|
|
/* Base the IP-filtering on the IP address in any outgoing ARP packets */ |
462 |
gbeauche |
1.13 |
if (eth_hdr(skb)->h_proto == htons(ETH_P_ARP)) { |
463 |
cebix |
1.4 |
u8 *p = &skb->data[14+14]; /* source IP address */ |
464 |
|
|
u32 ip = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]; |
465 |
|
|
if (ip != v->ipfilter) { |
466 |
|
|
v->ipfilter = ip; |
467 |
|
|
printk("sheep_net: ipfilter set to %d.%d.%d.%d\n", (ip >> 24) & 0xff, (ip >> 16) & 0xff, (ip >> 8) & 0xff, ip & 0xff); |
468 |
|
|
} |
469 |
|
|
} |
470 |
|
|
|
471 |
|
|
/* Is this packet addressed solely to the local host? */ |
472 |
|
|
if (is_local_addr(v, skb->data) && !(skb->data[0] & ETH_ADDR_MULTICAST)) { |
473 |
|
|
skb->protocol = eth_type_trans(skb, v->ether); |
474 |
|
|
netif_rx(skb); |
475 |
|
|
return count; |
476 |
|
|
} |
477 |
|
|
if (skb->data[0] & ETH_ADDR_MULTICAST) { |
478 |
|
|
/* We can't clone the skb since we will manipulate the data below */ |
479 |
|
|
struct sk_buff *lskb = skb_copy(skb, GFP_ATOMIC); |
480 |
|
|
if (lskb) { |
481 |
|
|
lskb->protocol = eth_type_trans(lskb, v->ether); |
482 |
|
|
netif_rx(lskb); |
483 |
|
|
} |
484 |
|
|
} |
485 |
|
|
|
486 |
|
|
/* Outgoing packet (will be on the net) */ |
487 |
|
|
demasquerade(v, skb); |
488 |
|
|
|
489 |
|
|
skb->protocol = PROT_MAGIC; /* Magic value (we can recognize the packet in sheep_net_receiver) */ |
490 |
cebix |
1.1 |
dev_queue_xmit(skb); |
491 |
|
|
return count; |
492 |
|
|
} |
493 |
|
|
|
494 |
|
|
|
495 |
|
|
/* |
496 |
|
|
* Driver poll() function |
497 |
|
|
*/ |
498 |
|
|
|
499 |
|
|
static unsigned int sheep_net_poll(struct file *f, struct poll_table_struct *wait) |
500 |
|
|
{ |
501 |
|
|
struct SheepVars *v = (struct SheepVars *)f->private_data; |
502 |
|
|
D(bug("sheep_net: poll\n")); |
503 |
|
|
|
504 |
cebix |
1.4 |
/* Packets in queue? Then return */ |
505 |
|
|
if (!skb_queue_empty(&v->queue)) |
506 |
cebix |
1.1 |
return POLLIN | POLLRDNORM; |
507 |
|
|
|
508 |
cebix |
1.4 |
/* Otherwise wait for packet */ |
509 |
cebix |
1.1 |
poll_wait(f, &v->wait, wait); |
510 |
cebix |
1.4 |
if (!skb_queue_empty(&v->queue)) |
511 |
cebix |
1.1 |
return POLLIN | POLLRDNORM; |
512 |
cebix |
1.4 |
else |
513 |
cebix |
1.1 |
return 0; |
514 |
|
|
} |
515 |
|
|
|
516 |
|
|
|
517 |
|
|
/* |
518 |
|
|
* Driver ioctl() function |
519 |
|
|
*/ |
520 |
|
|
|
521 |
asvitkine |
1.17 |
#ifdef LINUX_26_36 |
522 |
|
|
static long sheep_net_ioctl(struct file *f, unsigned int code, unsigned long arg) |
523 |
|
|
#else |
524 |
cebix |
1.1 |
static int sheep_net_ioctl(struct inode *inode, struct file *f, unsigned int code, unsigned long arg) |
525 |
asvitkine |
1.17 |
#endif |
526 |
cebix |
1.1 |
{ |
527 |
|
|
struct SheepVars *v = (struct SheepVars *)f->private_data; |
528 |
|
|
D(bug("sheep_net: ioctl %04x\n", code)); |
529 |
|
|
|
530 |
|
|
switch (code) { |
531 |
|
|
|
532 |
cebix |
1.4 |
/* Attach to Ethernet card |
533 |
cebix |
1.7 |
arg: pointer to name of Ethernet device (char[20]) */ |
534 |
cebix |
1.1 |
case SIOCSIFLINK: { |
535 |
cebix |
1.7 |
char name[20]; |
536 |
cebix |
1.4 |
int err; |
537 |
cebix |
1.1 |
|
538 |
cebix |
1.4 |
/* Already attached? */ |
539 |
cebix |
1.1 |
if (v->ether) |
540 |
|
|
return -EBUSY; |
541 |
|
|
|
542 |
cebix |
1.4 |
/* Get Ethernet card name */ |
543 |
cebix |
1.7 |
if (copy_from_user(name, (void *)arg, 20)) |
544 |
cebix |
1.1 |
return -EFAULT; |
545 |
cebix |
1.7 |
name[19] = 0; |
546 |
cebix |
1.1 |
|
547 |
cebix |
1.4 |
/* Find card */ |
548 |
asvitkine |
1.15 |
#ifdef LINUX_26 |
549 |
|
|
v->ether = dev_get_by_name(&init_net, name); |
550 |
|
|
#elif defined(LINUX_24) |
551 |
cebix |
1.4 |
v->ether = dev_get_by_name(name); |
552 |
|
|
#else |
553 |
cebix |
1.1 |
dev_lock_list(); |
554 |
|
|
v->ether = dev_get(name); |
555 |
cebix |
1.4 |
#endif |
556 |
cebix |
1.1 |
if (v->ether == NULL) { |
557 |
cebix |
1.4 |
err = -ENODEV; |
558 |
|
|
goto error; |
559 |
cebix |
1.1 |
} |
560 |
|
|
|
561 |
cebix |
1.4 |
/* Is it Ethernet? */ |
562 |
cebix |
1.1 |
if (v->ether->type != ARPHRD_ETHER) { |
563 |
cebix |
1.4 |
err = -EINVAL; |
564 |
|
|
goto error; |
565 |
cebix |
1.1 |
} |
566 |
|
|
|
567 |
cebix |
1.4 |
/* Remember the card's hardware address */ |
568 |
|
|
memcpy(v->eth_addr, v->ether->dev_addr, 6); |
569 |
|
|
|
570 |
|
|
/* Allocate socket */ |
571 |
asvitkine |
1.15 |
#ifdef LINUX_26 |
572 |
|
|
v->skt = sk_alloc(dev_net(v->ether), GFP_USER, 1, &sheep_proto); |
573 |
|
|
#else |
574 |
|
|
v->skt = sk_alloc(0, GFP_USER, 1); |
575 |
|
|
#endif |
576 |
cebix |
1.1 |
if (v->skt == NULL) { |
577 |
cebix |
1.4 |
err = -ENOMEM; |
578 |
|
|
goto error; |
579 |
cebix |
1.1 |
} |
580 |
gbeauche |
1.14 |
skt_set_dead(v->skt); |
581 |
cebix |
1.1 |
|
582 |
cebix |
1.4 |
/* Attach packet handler */ |
583 |
cebix |
1.1 |
v->pt.type = htons(ETH_P_ALL); |
584 |
|
|
v->pt.dev = v->ether; |
585 |
|
|
v->pt.func = sheep_net_receiver; |
586 |
|
|
dev_add_pack(&v->pt); |
587 |
cebix |
1.4 |
#ifndef LINUX_24 |
588 |
cebix |
1.1 |
dev_unlock_list(); |
589 |
cebix |
1.4 |
#endif |
590 |
cebix |
1.1 |
return 0; |
591 |
cebix |
1.4 |
|
592 |
|
|
error: |
593 |
|
|
#ifdef LINUX_24 |
594 |
|
|
if (v->ether) |
595 |
|
|
dev_put(v->ether); |
596 |
|
|
#else |
597 |
|
|
dev_unlock_list(); |
598 |
|
|
#endif |
599 |
|
|
v->ether = NULL; |
600 |
|
|
return err; |
601 |
cebix |
1.1 |
} |
602 |
|
|
|
603 |
cebix |
1.4 |
/* Get hardware address of the sheep_net module |
604 |
|
|
arg: pointer to buffer (6 bytes) to store address */ |
605 |
cebix |
1.1 |
case SIOCGIFADDR: |
606 |
cebix |
1.4 |
if (copy_to_user((void *)arg, v->fake_addr, 6)) |
607 |
|
|
return -EFAULT; |
608 |
|
|
return 0; |
609 |
|
|
|
610 |
|
|
/* Set the hardware address of the sheep_net module |
611 |
|
|
arg: pointer to new address (6 bytes) */ |
612 |
|
|
case SIOCSIFADDR: |
613 |
|
|
if (copy_from_user(v->fake_addr, (void*)arg, 6)) |
614 |
cebix |
1.1 |
return -EFAULT; |
615 |
|
|
return 0; |
616 |
|
|
|
617 |
cebix |
1.4 |
/* Add multicast address |
618 |
|
|
arg: pointer to address (6 bytes) */ |
619 |
cebix |
1.1 |
case SIOCADDMULTI: { |
620 |
|
|
char addr[6]; |
621 |
|
|
if (v->ether == NULL) |
622 |
|
|
return -ENODEV; |
623 |
|
|
if (copy_from_user(addr, (void *)arg, 6)) |
624 |
|
|
return -EFAULT; |
625 |
asvitkine |
1.17 |
#ifdef LINUX_26_35 |
626 |
|
|
return dev_mc_add(v->ether, addr); |
627 |
|
|
#else |
628 |
cebix |
1.1 |
return dev_mc_add(v->ether, addr, 6, 0); |
629 |
asvitkine |
1.17 |
#endif |
630 |
cebix |
1.1 |
} |
631 |
|
|
|
632 |
cebix |
1.4 |
/* Remove multicast address |
633 |
|
|
arg: pointer to address (6 bytes) */ |
634 |
cebix |
1.1 |
case SIOCDELMULTI: { |
635 |
|
|
char addr[6]; |
636 |
|
|
if (v->ether == NULL) |
637 |
|
|
return -ENODEV; |
638 |
|
|
if (copy_from_user(addr, (void *)arg, 6)) |
639 |
|
|
return -EFAULT; |
640 |
asvitkine |
1.17 |
#ifdef LINUX_26_35 |
641 |
|
|
return dev_mc_del(v->ether, addr); |
642 |
|
|
#else |
643 |
cebix |
1.1 |
return dev_mc_delete(v->ether, addr, 6, 0); |
644 |
asvitkine |
1.17 |
#endif |
645 |
cebix |
1.1 |
} |
646 |
|
|
|
647 |
cebix |
1.4 |
/* Return size of first packet in queue */ |
648 |
cebix |
1.1 |
case FIONREAD: { |
649 |
|
|
int count = 0; |
650 |
|
|
struct sk_buff *skb; |
651 |
cebix |
1.4 |
#ifdef LINUX_24 |
652 |
gbeauche |
1.12 |
unsigned long flags; |
653 |
cebix |
1.4 |
spin_lock_irqsave(&v->queue.lock, flags); |
654 |
|
|
#else |
655 |
|
|
cli(); |
656 |
|
|
#endif |
657 |
cebix |
1.1 |
skb = skb_peek(&v->queue); |
658 |
|
|
if (skb) |
659 |
|
|
count = skb->len; |
660 |
cebix |
1.4 |
#ifdef LINUX_24 |
661 |
|
|
spin_unlock_irqrestore(&v->queue.lock, flags); |
662 |
|
|
#else |
663 |
|
|
sti(); |
664 |
|
|
#endif |
665 |
cebix |
1.1 |
return put_user(count, (int *)arg); |
666 |
|
|
} |
667 |
|
|
|
668 |
cebix |
1.4 |
case SIOC_MOL_GET_IPFILTER: |
669 |
|
|
return put_user(v->ipfilter, (int *)arg); |
670 |
|
|
|
671 |
|
|
case SIOC_MOL_SET_IPFILTER: |
672 |
|
|
v->ipfilter = arg; |
673 |
|
|
return 0; |
674 |
|
|
|
675 |
cebix |
1.1 |
default: |
676 |
|
|
return -ENOIOCTLCMD; |
677 |
|
|
} |
678 |
|
|
} |
679 |
|
|
|
680 |
|
|
|
681 |
|
|
/* |
682 |
|
|
* Packet receiver function |
683 |
|
|
*/ |
684 |
|
|
|
685 |
asvitkine |
1.15 |
#ifdef LINUX_26 |
686 |
|
|
static int sheep_net_receiver(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *foo) |
687 |
|
|
#else |
688 |
cebix |
1.4 |
static int sheep_net_receiver(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt) |
689 |
asvitkine |
1.15 |
#endif |
690 |
cebix |
1.1 |
{ |
691 |
gbeauche |
1.12 |
struct SheepVars *v = (struct SheepVars *)pt; |
692 |
cebix |
1.4 |
struct sk_buff *skb2; |
693 |
|
|
int fake; |
694 |
|
|
int multicast; |
695 |
cebix |
1.1 |
D(bug("sheep_net: packet received\n")); |
696 |
|
|
|
697 |
gbeauche |
1.13 |
multicast = (eth_hdr(skb)->h_dest[0] & ETH_ADDR_MULTICAST); |
698 |
|
|
fake = is_fake_addr(v, ð_hdr(skb)->h_dest); |
699 |
cebix |
1.4 |
|
700 |
|
|
/* Packet sent by us? Then discard */ |
701 |
gbeauche |
1.13 |
if (is_fake_addr(v, ð_hdr(skb)->h_source) || skb->protocol == PROT_MAGIC) |
702 |
cebix |
1.4 |
goto drop; |
703 |
|
|
|
704 |
|
|
/* If the packet is not meant for this host, discard it */ |
705 |
gbeauche |
1.13 |
if (!is_local_addr(v, ð_hdr(skb)->h_dest) && !multicast && !fake) |
706 |
cebix |
1.4 |
goto drop; |
707 |
|
|
|
708 |
|
|
/* Discard packets if queue gets too full */ |
709 |
|
|
if (skb_queue_len(&v->queue) > MAX_QUEUE) |
710 |
|
|
goto drop; |
711 |
|
|
|
712 |
|
|
/* Apply any filters here (if fake is true, then we *know* we want this packet) */ |
713 |
|
|
if (!fake) { |
714 |
|
|
if ((skb->protocol == htons(ETH_P_IP)) |
715 |
asvitkine |
1.15 |
&& (!v->ipfilter || (ntohl(ipip_hdr(skb)->daddr) != v->ipfilter && !multicast))) |
716 |
cebix |
1.4 |
goto drop; |
717 |
cebix |
1.1 |
} |
718 |
|
|
|
719 |
cebix |
1.4 |
/* Masquerade (we are typically a clone - best to make a real copy) */ |
720 |
|
|
skb2 = skb_copy(skb, GFP_ATOMIC); |
721 |
|
|
if (!skb2) |
722 |
|
|
goto drop; |
723 |
|
|
kfree_skb(skb); |
724 |
|
|
skb = skb2; |
725 |
|
|
masquerade(v, skb); |
726 |
cebix |
1.1 |
|
727 |
cebix |
1.4 |
/* We also want the Ethernet header */ |
728 |
asvitkine |
1.15 |
skb_push(skb, skb->data - skb_mac_header(skb)); |
729 |
cebix |
1.1 |
|
730 |
cebix |
1.4 |
/* Enqueue packet */ |
731 |
cebix |
1.1 |
skb_queue_tail(&v->queue, skb); |
732 |
|
|
|
733 |
cebix |
1.4 |
/* Unblock blocked read */ |
734 |
cebix |
1.1 |
wake_up(&v->wait); |
735 |
cebix |
1.4 |
return 0; |
736 |
|
|
|
737 |
|
|
drop: |
738 |
|
|
kfree_skb(skb); |
739 |
cebix |
1.1 |
return 0; |
740 |
|
|
} |
741 |
cebix |
1.9 |
|
742 |
|
|
MODULE_LICENSE("GPL"); |