summaryrefslogtreecommitdiff
path: root/pfinet/ethernet.c
blob: 16782435c1a80ca4637c0bf18cda8bad12298df9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
/*
   Copyright (C) 1995, 1996, 1998, 1999, 2000, 2002, 2007
     Free Software Foundation, Inc.

   Written by Michael I. Bushnell, p/BSG.

   This file is part of the GNU Hurd.

   The GNU Hurd is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   The GNU Hurd is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA. */

/* Do not include glue-include/linux/errno.h */
#define _HACK_ERRNO_H
#include "pfinet.h"

#include <device/device.h>
#include <device/net_status.h>
#include <netinet/in.h>
#include <string.h>
#include <error.h>
#include <fcntl.h>

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>


struct port_class *etherreadclass;

struct ether_device
{
  struct ether_device *next;
  device_t ether_port;
  struct port_info *readpt;
  mach_port_t readptname;
  struct device dev;
};

/* Linked list of all ethernet devices.  */
struct ether_device *ether_dev;

struct enet_statistics retbuf;


/* Mach doesn't provide this.  DAMN. */
struct enet_statistics *
ethernet_get_stats (struct device *dev)
{
  return &retbuf;
}

int
ethernet_stop (struct device *dev)
{
  return 0;
}

void
ethernet_set_multi (struct device *dev)
{
}

static short ether_filter[] =
{
#ifdef NETF_IN
  /* We have to tell the packet filtering code that we're interested in
     incoming packets.  */
  NETF_IN, /* Header.  */
#endif
  NETF_PUSHLIT | NETF_NOP,
  1
};
static int ether_filter_len = sizeof (ether_filter) / sizeof (short);

static struct bpf_insn bpf_ether_filter[] =
{
    {NETF_IN|NETF_BPF, 0, 0, 0},		/* Header. */
    {BPF_LD|BPF_H|BPF_ABS, 0, 0, 12},		/* Load Ethernet type */
    {BPF_JMP|BPF_JEQ|BPF_K, 2, 0, 0x0806},	/* Accept ARP */
    {BPF_JMP|BPF_JEQ|BPF_K, 1, 0, 0x0800},	/* Accept IPv4 */
    {BPF_JMP|BPF_JEQ|BPF_K, 0, 1, 0x86DD},	/* Accept IPv6 */
    {BPF_RET|BPF_K, 0, 0, 1500},		/* And return 1500 bytes */
    {BPF_RET|BPF_K, 0, 0, 0},			/* Or discard it all */
};
static int bpf_ether_filter_len = sizeof (bpf_ether_filter) / sizeof (short);

static struct port_bucket *etherport_bucket;


static void *
ethernet_thread (void *arg)
{
  ports_manage_port_operations_one_thread (etherport_bucket,
					   ethernet_demuxer,
					   0);
  return NULL;
}

int
ethernet_demuxer (mach_msg_header_t *inp,
		  mach_msg_header_t *outp)
{
  struct net_rcv_msg *msg = (struct net_rcv_msg *) inp;
  struct sk_buff *skb;
  int datalen;
  struct ether_device *edev;
  struct device *dev = 0;
  mach_port_t local_port;

  if (inp->msgh_id != NET_RCV_MSG_ID)
    return 0;

  if (MACH_MSGH_BITS_LOCAL (inp->msgh_bits) ==
      MACH_MSG_TYPE_PROTECTED_PAYLOAD)
    {
      struct port_info *pi = ports_lookup_payload (NULL,
						   inp->msgh_protected_payload,
						   NULL);
      if (pi)
	{
	  local_port = pi->port_right;
	  ports_port_deref (pi);
	}
      else
	local_port = MACH_PORT_NULL;
    }
  else
    local_port = inp->msgh_local_port;

  for (edev = ether_dev; edev; edev = edev->next)
    if (local_port == edev->readptname)
      dev = &edev->dev;

  if (! dev)
    {
      if (inp->msgh_remote_port != MACH_PORT_NULL)
	mach_port_deallocate (mach_task_self (), inp->msgh_remote_port);
      return 1;
    }

  datalen = ETH_HLEN
    + msg->packet_type.msgt_number - sizeof (struct packet_header);

  pthread_mutex_lock (&net_bh_lock);
  skb = alloc_skb (datalen, GFP_ATOMIC);
  skb_put (skb, datalen);
  skb->dev = dev;

  /* Copy the two parts of the frame into the buffer. */
  bcopy (msg->header, skb->data, ETH_HLEN);
  bcopy (msg->packet + sizeof (struct packet_header),
	 skb->data + ETH_HLEN,
	 datalen - ETH_HLEN);

  /* Drop it on the queue. */
  skb->protocol = eth_type_trans (skb, dev);
  netif_rx (skb);
  pthread_mutex_unlock (&net_bh_lock);

  return 1;
}


void
ethernet_initialize (void)
{
  pthread_t thread;
  error_t err;
  etherport_bucket = ports_create_bucket ();
  etherreadclass = ports_create_class (0, 0);

  err = pthread_create (&thread, NULL, ethernet_thread, NULL);
  if (!err)
    pthread_detach (thread);
  else
    {
      errno = err;
      perror ("pthread_create");
    }
}

int
ethernet_open (struct device *dev)
{
  error_t err;
  device_t master_device;
  struct ether_device *edev = (struct ether_device *) dev->priv;

  assert (edev->ether_port == MACH_PORT_NULL);

  err = ports_create_port (etherreadclass, etherport_bucket,
			   sizeof (struct port_info), &edev->readpt);
  assert_perror (err);
  edev->readptname = ports_get_right (edev->readpt);
  mach_port_insert_right (mach_task_self (), edev->readptname, edev->readptname,
			  MACH_MSG_TYPE_MAKE_SEND);

  mach_port_set_qlimit (mach_task_self (), edev->readptname, MACH_PORT_QLIMIT_MAX);

  master_device = file_name_lookup (dev->name, O_READ | O_WRITE, 0);
  if (master_device != MACH_PORT_NULL)
    {
      /* The device name here is the path of a device file.  */
      err = device_open (master_device, D_WRITE | D_READ, "eth", &edev->ether_port);
      mach_port_deallocate (mach_task_self (), master_device);
      if (err)
	error (2, err, "device_open on %s", dev->name);

      err = device_set_filter (edev->ether_port, ports_get_right (edev->readpt),
			       MACH_MSG_TYPE_MAKE_SEND, 0,
			       bpf_ether_filter, bpf_ether_filter_len);
      if (err)
	error (2, err, "device_set_filter on %s", dev->name);
    }
  else
    {
      /* No, perhaps a Mach device?  */
      int file_errno = errno;
      err = get_privileged_ports (0, &master_device);
      if (err)
	{
	  error (0, file_errno, "file_name_lookup %s", dev->name);
	  error (2, err, "and cannot get device master port");
	}
      err = device_open (master_device, D_WRITE | D_READ, dev->name, &edev->ether_port);
      mach_port_deallocate (mach_task_self (), master_device);
      if (err)
	{
	  error (0, file_errno, "file_name_lookup %s", dev->name);
	  error (2, err, "device_open(%s)", dev->name);
	}

      err = device_set_filter (edev->ether_port, ports_get_right (edev->readpt),
			       MACH_MSG_TYPE_MAKE_SEND, 0,
			       ether_filter, ether_filter_len);
      if (err)
	error (2, err, "device_set_filter on %s", dev->name);
    }

  return 0;
}

int
ethernet_close (struct device *dev)
{
  struct ether_device *edev = (struct ether_device *) dev->priv;

  mach_port_deallocate (mach_task_self (), edev->readptname);
  edev->readptname = MACH_PORT_NULL;
  ports_destroy_right (edev->readpt);
  edev->readpt = NULL;
  device_close (edev->ether_port);
  mach_port_deallocate (mach_task_self (), edev->ether_port);
  edev->ether_port = MACH_PORT_NULL;
}

/* Transmit an ethernet frame */
int
ethernet_xmit (struct sk_buff *skb, struct device *dev)
{
  error_t err;
  struct ether_device *edev = (struct ether_device *) dev->priv;
  u_int count;
  u_int tried = 0;

  do
    {
      tried++;
      err = device_write (edev->ether_port, D_NOWAIT, 0, skb->data, skb->len, &count);
      if (err == EMACH_SEND_INVALID_DEST || err == EMIG_SERVER_DIED)
	{
	  /* Device probably just died, try to reopen it.  */

	  if (tried == 2)
	    /* Too many tries, abort */
	    break;

	  ethernet_close (dev);
	  ethernet_open (dev);
	}
      else
	{
	  assert_perror (err);
	  assert (count == skb->len);
	}
    }
  while (err);

  dev_kfree_skb (skb);
  return 0;
}

/* Set device flags (e.g. promiscuous) */
static int
ethernet_change_flags (struct device *dev, short flags)
{
  error_t err = 0;
#ifdef NET_FLAGS
  int status = flags;
  struct ether_device *edev = (struct ether_device *) dev->priv;
  err = device_set_status (edev->ether_port, NET_FLAGS, &status, 1);
  if (err == D_INVALID_OPERATION)
    /* Not supported, ignore.  */
    err = 0;
#endif
  return err;
}

void
setup_ethernet_device (char *name, struct device **device)
{
  struct net_status netstat;
  size_t count;
  int net_address[2];
  error_t err;
  struct ether_device *edev;
  struct device *dev;

  edev = calloc (1, sizeof (struct ether_device));
  if (!edev)
    error (2, ENOMEM, "%s", name);
  edev->next = ether_dev;
  ether_dev = edev;

  *device = dev = &edev->dev;

  dev->name = strdup (name);
  /* Functions.  These ones are the true "hardware layer" in Linux.  */
  dev->open = 0;		/* We set up before calling dev_open.  */
  dev->stop = ethernet_stop;
  dev->hard_start_xmit = ethernet_xmit;
  dev->get_stats = ethernet_get_stats;
  dev->set_multicast_list = ethernet_set_multi;

  /* These are the ones set by drivers/net/net_init.c::ether_setup.  */
  dev->hard_header = eth_header;
  dev->rebuild_header = eth_rebuild_header;
  dev->hard_header_cache = eth_header_cache;
  dev->header_cache_update = eth_header_cache_update;
  dev->hard_header_parse = eth_header_parse;
  /* We can't do these two (and we never try anyway).  */
  /* dev->change_mtu = eth_change_mtu; */
  /* dev->set_mac_address = eth_mac_addr; */

  /* Some more fields */
  dev->priv = edev;         /* For reverse lookup.  */
  dev->type = ARPHRD_ETHER;
  dev->hard_header_len = ETH_HLEN;
  dev->addr_len = ETH_ALEN;
  memset (dev->broadcast, 0xff, ETH_ALEN);
  dev->flags = IFF_BROADCAST | IFF_MULTICAST;

  /* FIXME: Receive all multicast to fix IPv6, until we implement
     ethernet_set_multi.  */
  dev->flags |= IFF_ALLMULTI;

  dev->change_flags = ethernet_change_flags;

  dev_init_buffers (dev);

  ethernet_open (dev);

  /* Fetch hardware information */
  count = NET_STATUS_COUNT;
  err = device_get_status (edev->ether_port, NET_STATUS,
			   (dev_status_t) &netstat, &count);
  if (err)
    error (2, err, "%s: Cannot get device status", name);
  dev->mtu = netstat.max_packet_size - dev->hard_header_len;
  assert (netstat.header_format == HDR_ETHERNET);
  assert (netstat.header_size == ETH_HLEN);
  assert (netstat.address_size == ETH_ALEN);

  count = 2;
  assert (count * sizeof (int) >= ETH_ALEN);
  err = device_get_status (edev->ether_port, NET_ADDRESS, net_address, &count);
  if (err)
    error (2, err, "%s: Cannot get hardware Ethernet address", name);
  net_address[0] = ntohl (net_address[0]);
  net_address[1] = ntohl (net_address[1]);
  bcopy (net_address, dev->dev_addr, ETH_ALEN);

  /* That should be enough.  */

  /* This call adds the device to the `dev_base' chain,
     initializes its `ifindex' member (which matters!),
     and tells the protocol stacks about the device.  */
  err = - register_netdevice (dev);
  assert_perror (err);
}