summaryrefslogtreecommitdiff
path: root/pfinet/options.c
blob: 21a35c615f79d2f66d53304b47fc3e1448673232 (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
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
/* Pfinet option parsing

   Copyright (C) 1996, 1997, 2000, 2001, 2006, 2007 Free Software Foundation, Inc.

   Written by Miles Bader <miles@gnu.org>

   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.,
   675 Mass Ave, Cambridge, MA 02139, USA. */

#include <stdlib.h>
#include <string.h>
#include <hurd.h>
#include <argp.h>
#include <argz.h>
#include <error.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include "pfinet.h"

#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/ip.h>
#include <linux/route.h>
#include <linux/rtnetlink.h>
#include <net/route.h>
#include <net/sock.h>
#include <net/ip_fib.h>
#include <net/ip6_fib.h>
#include <net/ip6_route.h>
#include <net/addrconf.h>

/* Our interface to the set of devices.  */
extern error_t find_device (char *name, struct device **device);
extern error_t enumerate_devices (error_t (*fun) (struct device *dev));

/* devinet.c */
extern error_t configure_device (struct device *dev, uint32_t addr,
				 uint32_t netmask, uint32_t peer,
				 uint32_t broadcast);
extern void inquire_device (struct device *dev, uint32_t *addr,
			    uint32_t *netmask, uint32_t *peer,
			    uint32_t *broadcast);

/* addrconf.c */
extern struct inet6_dev *ipv6_find_idev (struct device *dev);
extern int inet6_addr_add (int ifindex, struct in6_addr *pfx, int plen);
extern int inet6_addr_del (int ifindex, struct in6_addr *pfx, int plen);


/* Pfinet options.  Used for both startup and runtime.  */
static const struct argp_option options[] =
{
  {"interface", 'i', "DEVICE",  0,  "Network interface to use", 1},
  {0,0,0,0,"These apply to a given interface:", 2},
  {"address",   'a', "ADDRESS", 0, "Set the network address"},
  {"netmask",   'm', "MASK",    0, "Set the netmask"},
  {"peer",      'p', "ADDRESS", 0, "Set the peer address"},
  {"gateway",   'g', "ADDRESS", 0, "Set the default gateway"},
  {"ipv4",      '4', "NAME",    0, "Put active IPv4 translator on NAME"},
#ifdef CONFIG_IPV6  
  {"ipv6",      '6', "NAME",    0, "Put active IPv6 translator on NAME"},
  {"address6",  'A', "ADDR/LEN",0, "Set the global IPv6 address"},
  {"gateway6",  'G', "ADDRESS", 0, "Set the IPv6 default gateway"},
#endif
  {"shutdown",  's', 0,         0, "Shut it down"},
  {0}
};

static const char doc[] = "Interface-specific options before the first \
interface specification apply to the first following interface; otherwise \
they apply to the previously specified interface.";

/* Used to describe a particular interface during argument parsing.  */
struct parse_interface
{
  /* The network interface in question.  */
  struct device *device;

  /* New values to apply to it. (IPv4) */
  uint32_t address, netmask, peer, gateway;

#ifdef CONFIG_IPV6
  /* New IPv6 configuration to apply. */
  struct inet6_ifaddr address6;
  struct in6_addr gateway6;
#endif
};

/* Used to hold data during argument parsing.  */
struct parse_hook
{
  /* A list of specified interfaces and their corresponding options.  */
  struct parse_interface *interfaces;
  size_t num_interfaces;

  /* Interface to which options apply.  If the device field isn't filled in
     then it should be by the next --interface option.  */
  struct parse_interface *curint;
};

/* Adds an empty interface slot to H, and sets H's current interface to it, or
   returns an error. */
static error_t
parse_hook_add_interface (struct parse_hook *h)
{
  struct parse_interface *new =
    realloc (h->interfaces,
	     (h->num_interfaces + 1) * sizeof (struct parse_interface));
  if (! new)
    return ENOMEM;
  h->interfaces = new;
  h->num_interfaces++;
  h->curint = new + h->num_interfaces - 1;
  h->curint->device = 0;
  h->curint->address = INADDR_NONE;
  h->curint->netmask = INADDR_NONE;
  h->curint->peer = INADDR_NONE;
  h->curint->gateway = INADDR_NONE;

#ifdef CONFIG_IPV6
  memset (&h->curint->address6, 0, sizeof (struct inet6_ifaddr));
  memset (&h->curint->gateway6, 0, sizeof (struct in6_addr));
#endif

  return 0;
}

#ifdef CONFIG_IPV6
static struct rt6_info *
ipv6_get_dflt_router (void)
{
  struct in6_addr daddr = { 0 };

  struct fib6_node *fib = fib6_lookup
    (&ip6_routing_table, &daddr, NULL);
  return fib->leaf;
}
#endif /* CONFIG_IPV6 */


static error_t
parse_opt (int opt, char *arg, struct argp_state *state)
{
  error_t err = 0;
  struct parse_hook *h = state->hook;

  /* Return _ERR from this routine, and in the special case of OPT being
     ARGP_KEY_SUCCESS, remember to free H first.  */
#define RETURN(_err)								\
  do { if (opt == ARGP_KEY_SUCCESS)						\
	 { err = (_err); goto free_hook; }					\
       else									\
	 return _err; } while (0)

  /* Print a parsing error message and (if exiting is turned off) return the
     error code ERR.  */
#define PERR(err, fmt, args...)							\
  do { argp_error (state, fmt , ##args); RETURN (err); } while (0)

  /* Like PERR but for non-parsing errors.  */
#define FAIL(rerr, status, perr, fmt, args...) \
  do{ argp_failure (state, status, perr, fmt , ##args); RETURN (rerr); } while(0)

  /* Parse STR and return the corresponding  internet address.  If STR is not
     a valid internet address, signal an error mentioned TYPE.  */
#undef	ADDR
#define ADDR(str, type)							      \
  ({ unsigned long addr = inet_addr (str);				      \
     if (addr == INADDR_NONE) PERR (EINVAL, "Malformed %s", type);	      \
     addr; })

  switch (opt)
    {
      struct parse_interface *in;
      uint32_t gateway;
#ifdef CONFIG_IPV6
      struct parse_interface *gw6_in;
      char *ptr;
#endif

    case 'i':
      /* An interface.  */
      err = 0;
      if (h->curint->device)
	/* The current interface slot is not available.  */
	{
	  /* First see if a previously specified one is being re-specified.  */
	  for (in = h->interfaces; in < h->interfaces + h->num_interfaces; in++)
	    if (strcmp (in->device->name, arg) == 0)
	      /* Re-use an old slot.  */
	      {
		h->curint = in;
		return 0;
	      }

	  /* Add a new interface entry.  */
	  err = parse_hook_add_interface (h);
	}
      in = h->curint;

      if (! err)
	err = find_device (arg, &in->device);
      if (err)
	FAIL (err, 10, err, "%s", arg);

      break;

    case 'a':
      h->curint->address = ADDR (arg, "address");
      if (!IN_CLASSA (ntohl (h->curint->address))
	  && !IN_CLASSB (ntohl (h->curint->address))
	  && !IN_CLASSC (ntohl (h->curint->address)))
	{
	  if (IN_MULTICAST (ntohl (h->curint->address)))
	    FAIL (EINVAL, 1, 0,
		  "%s: Cannot set interface address to multicast address",
		  arg);
	  else
	    FAIL (EINVAL, 1, 0,
		  "%s: Illegal or undefined network address", arg);
	}
      break;
    case 'm':
      h->curint->netmask = ADDR (arg, "netmask"); break;
    case 'p':
      h->curint->peer = ADDR (arg, "peer"); break;
    case 'g':
      h->curint->gateway = ADDR (arg, "gateway"); break;

    case '4':
      pfinet_bind (PORTCLASS_INET, arg);

      /* Install IPv6 port class on bootstrap port. */
      pfinet_bootstrap_portclass = PORTCLASS_INET6;
      break;

#ifdef CONFIG_IPV6
    case '6':
      pfinet_bind (PORTCLASS_INET6, arg);
      break;

    case 'A':
      if ((ptr = strchr (arg, '/'))) 
	{
	  h->curint->address6.prefix_len = atoi (ptr + 1);
	  if (h->curint->address6.prefix_len > 128) 
	    FAIL (EINVAL, 1, 0, "%s: The prefix-length is invalid", arg);

	  *ptr = 0;
	}
      else
	{
	  h->curint->address6.prefix_len = 64;
	  fprintf (stderr, "No prefix-length given, defaulting to %s/64.\n",
		   arg);
	}

      if (inet_pton (AF_INET6, arg, &h->curint->address6.addr) <= 0)
	PERR (EINVAL, "Malformed address");

      if (IN6_IS_ADDR_MULTICAST (&h->curint->address6.addr))
	FAIL (EINVAL, 1, 0, "%s: Cannot set interface address to "
	      "multicast address", arg);
      break;

    case 'G':
      if (inet_pton (AF_INET6, arg, &h->curint->gateway6) <= 0)
	PERR (EINVAL, "Malformed gateway");

      if (IN6_IS_ADDR_MULTICAST (&h->curint->gateway6))
	FAIL (EINVAL, 1, 0, "%s: Cannot set gateway to "
	      "multicast address", arg);
      break;
#endif /* CONFIG_IPV6 */

    case ARGP_KEY_INIT:
      /* Initialize our parsing state.  */
      h = malloc (sizeof (struct parse_hook));
      if (! h)
	FAIL (ENOMEM, 11, ENOMEM, "option parsing");

      h->interfaces = 0;
      h->num_interfaces = 0;
      err = parse_hook_add_interface (h);
      if (err)
	FAIL (err, 12, err, "option parsing");

      state->hook = h;
      break;

    case ARGP_KEY_SUCCESS:
      in = h->curint;
      if (! in->device)
	/* No specific interface specified; is that ok?  */
	if (in->address != INADDR_NONE || in->netmask != INADDR_NONE
	    || in->gateway != INADDR_NONE)
	  /* Some options were specified, so we need an interface.  See if
             there's a single extant interface to use as a default.  */
	  {
	    err = find_device (0, &in->device);
	    if (err)
	      FAIL (err, 13, 0, "No default interface");
	  }
#if 0				/* XXX what does this mean??? */
      /* Check for bogus option combinations.  */
      for (in = h->interfaces; in < h->interfaces + h->num_interfaces; in++)
	if (in->netmask != INADDR_NONE
	    && in->address == INADDR_NONE && in->device->pa_addr == 0)
	  /* Specifying a netmask for an address-less interface is a no-no.  */
	  FAIL (EDESTADDRREQ, 14, 0, "Cannot set netmask");
#endif

      gateway = INADDR_NONE;
#ifdef CONFIG_IPV6
      gw6_in = NULL;
#endif
      for (in = h->interfaces; in < h->interfaces + h->num_interfaces; in++)
	{
	  if (in->gateway != INADDR_NONE)
	    {
	      if (gateway != INADDR_NONE)
		FAIL (err, 15, 0, "Cannot have multiple default gateways");
	      gateway = in->gateway;
	      in->gateway = INADDR_NONE;
	    }

#ifdef CONFIG_IPV6
	  if (!IN6_IS_ADDR_UNSPECIFIED (&in->gateway6))
	    {
	      if (gw6_in != NULL)
		FAIL (err, 15, 0, "Cannot have multiple IPv6 "
		      "default gateways");
	      gw6_in = in;
	    }
#endif
	}
      /* Successfully finished parsing, return a result.  */

      __mutex_lock (&global_lock);

      for (in = h->interfaces; in < h->interfaces + h->num_interfaces; in++)
	{
#ifdef CONFIG_IPV6
	  struct inet6_dev *idev = NULL;
	  if (trivfs_protid_portclasses[PORTCLASS_INET6] != MACH_PORT_NULL
	      && in->device)
	    idev = ipv6_find_idev(in->device);
#endif

	  if (in->address != INADDR_NONE || in->netmask != INADDR_NONE)
	    {
	      err = configure_device (in->device, in->address, in->netmask,
				      in->peer, INADDR_NONE);
	      if (err)
		{
		  __mutex_unlock (&global_lock);
		  FAIL (err, 16, 0, "cannot configure interface");
		}
	    }

#ifdef CONFIG_IPV6
	  if (!idev)
	    continue;

	  /* First let's remove all non-local addresses. */
	  struct inet6_ifaddr *ifa = idev->addr_list;

	  while (ifa)
	    {
	      struct inet6_ifaddr *c_ifa = ifa;
	      ifa = ifa->if_next;

	      if (IN6_ARE_ADDR_EQUAL (&c_ifa->addr, &in->address6.addr))
		memset (&in->address6, 0, sizeof (struct inet6_ifaddr));

	      else if (!IN6_IS_ADDR_LINKLOCAL (&c_ifa->addr)
		       && !IN6_IS_ADDR_SITELOCAL (&c_ifa->addr))
		inet6_addr_del (in->device->ifindex, &c_ifa->addr,
				c_ifa->prefix_len);
	    }

	  if (!IN6_IS_ADDR_UNSPECIFIED (&in->address6.addr))
	    {
	      /* Now assign the new address */
	      inet6_addr_add (in->device->ifindex, &in->address6.addr,
			      in->address6.prefix_len);
	    }
#endif /* CONFIG_IPV6 */
	}

      /* Set the default gateway.  This code is cobbled together from what
	 the SIOCADDRT ioctl code does, and from the apparent functionality
	 of the "netlink" layer from perusing a little.  */
      {
	struct kern_rta rta;
	struct
	{
	  struct nlmsghdr nlh;
	  struct rtmsg rtm;
	} req;
	struct fib_table *tb;

	req.nlh.nlmsg_pid = 0;
	req.nlh.nlmsg_seq = 0;
	req.nlh.nlmsg_len = NLMSG_LENGTH (sizeof req.rtm);

	bzero (&req.rtm, sizeof req.rtm);
	bzero (&rta, sizeof rta);
	req.rtm.rtm_scope = RT_SCOPE_UNIVERSE;
	req.rtm.rtm_type = RTN_UNICAST;
	req.rtm.rtm_protocol = RTPROT_STATIC;
	rta.rta_gw = &gateway;

	if (gateway == INADDR_NONE)
	  {
	    /* Delete any existing default route.  */
	    req.nlh.nlmsg_type = RTM_DELROUTE;
	    req.nlh.nlmsg_flags = 0;
	    tb = fib_get_table (req.rtm.rtm_table);
	    if (tb)
	      {
		err = - (*tb->tb_delete) (tb, &req.rtm, &rta, &req.nlh, 0);
		if (err && err != ESRCH)
		  {
		    __mutex_unlock (&global_lock);
		    FAIL (err, 17, 0, "cannot remove old default gateway");
		  }
		err = 0;
	      }
	  }
	else
	  {
	    /* Add a default route, replacing any existing one.  */
	    req.nlh.nlmsg_type = RTM_NEWROUTE;
	    req.nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
	    tb = fib_new_table (req.rtm.rtm_table);
	    err = (!tb ? ENOBUFS
		   : - (*tb->tb_insert) (tb, &req.rtm, &rta, &req.nlh, 0));
	    if (err)
	      {
		__mutex_unlock (&global_lock);
	        FAIL (err, 17, 0, "cannot set default gateway");
	      }
	  }
      }

      /* Set IPv6 default router. */
#ifdef CONFIG_IPV6
      if (trivfs_protid_portclasses[PORTCLASS_INET6] != MACH_PORT_NULL)
	{
	  struct rt6_info *rt6i = ipv6_get_dflt_router ();

	  if (!gw6_in || rt6i->rt6i_dev != gw6_in->device
	      || !IN6_ARE_ADDR_EQUAL (&rt6i->rt6i_gateway, &gw6_in->gateway6))
	    {
	      rt6_purge_dflt_routers (0);
	      if (gw6_in)
		rt6_add_dflt_router (&gw6_in->gateway6, gw6_in->device);
	    }
	}
#endif       

      __mutex_unlock (&global_lock);

      /* Fall through to free hook.  */

    case ARGP_KEY_ERROR:
      /* Parsing error occurred, free everything. */
    free_hook:
      free (h->interfaces);
      free (h);
      break;

    default:
      return ARGP_ERR_UNKNOWN;
    }

  return err;
}

struct argp
pfinet_argp = { options, parse_opt, 0, doc };

struct argp *trivfs_runtime_argp = &pfinet_argp;

error_t
trivfs_append_args (struct trivfs_control *fsys, char **argz, size_t *argz_len)
{
  error_t add_dev_opts (struct device *dev)
    {
      error_t err = 0;
      uint32_t addr, mask, peer, broad;
      struct rt_key key = { 0 };
      struct fib_result res;

      inquire_device (dev, &addr, &mask, &peer, &broad);

#define ADD_OPT(fmt, args...)						\
  do { char buf[100];							\
       if (! err) {							\
         snprintf (buf, sizeof buf, fmt , ##args);			\
         err = argz_add (argz, argz_len, buf); } } while (0)
#define ADD_ADDR_OPT(name, addr)					\
  do { struct in_addr i;						\
       i.s_addr = (addr);						\
       ADD_OPT ("--%s=%s", name, inet_ntoa (i)); } while (0)

      ADD_OPT ("--interface=%s", dev->name);
      if (addr != INADDR_NONE)
        ADD_ADDR_OPT ("address", addr);
      if (mask != INADDR_NONE)
        ADD_ADDR_OPT ("netmask", mask);
      if (peer != addr)
	ADD_ADDR_OPT ("peer", peer);
      key.iif = dev->ifindex;
      if (! main_table->tb_lookup (main_table, &key, &res)) 
	ADD_ADDR_OPT ("gateway", FIB_RES_GW (res));

#undef ADD_ADDR_OPT

#ifdef CONFIG_IPV6
      struct inet6_dev *idev = NULL;

      if (trivfs_protid_portclasses[PORTCLASS_INET6] != MACH_PORT_NULL)
	idev = ipv6_find_idev(dev);

      if (idev)
	{
	  struct inet6_ifaddr *ifa = idev->addr_list;
	  static char addr_buf[INET6_ADDRSTRLEN];

	  /* Push all IPv6 addresses assigned to the interface. */
	  do 
	    {
	      inet_ntop (AF_INET6, &ifa->addr, addr_buf, INET6_ADDRSTRLEN);
	      ADD_OPT ("--address6=%s/%d", addr_buf, ifa->prefix_len);
	    }
	  while ((ifa = ifa->if_next));

	  /* Last not least push --gateway6 option. */
	  struct rt6_info *rt6i = ipv6_get_dflt_router ();
	  if(rt6i->rt6i_dev == dev) 
	    {
	      inet_ntop (AF_INET6, &rt6i->rt6i_gateway, addr_buf,
			 INET6_ADDRSTRLEN);
	      ADD_OPT ("--gateway6=%s", addr_buf);
	    }
	}
#endif /* CONFIG_IPV6 */

#undef ADD_OPT

      return err;
    }

  return enumerate_devices (add_dev_opts);
}