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