aboutsummaryrefslogtreecommitdiffstats
path: root/sysconfig/network-scripts/network-functions-ipv6
blob: aa6bb35ef7c62de5a72a13a278d39af0ad48367b (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
#!/bin/sh
#
# network-functions-ipv6
#
# Taken from:
# (P) & (C) 1997-2001 by Peter Bieringer <pb@bieringer.de>
#
# Version: 2001-02-05
#


# Filter tags (for stripping, empty lines following if all is stripped)





# Return values
#  0 = ok
#  1 = error occurs
#  2 = not enabled, i.e. no IPv6 kernel support or switched off by configuration


##### Test for IPv6 capabilites

function test_ipv6()
{

    # Test for IPv6 enabled kernel

	if ! [ -f /proc/net/if_inet6 ]; then
		modprobe ipv6
	
		if ! [ -f /proc/net/if_inet6 ]; then
				echo $"Kernel is not compiled with IPv6 support"
			return 2
		fi
	fi

	# Test for IPv6 enabled needed binaries

	return 0
}

##### Control IPv6 forwarding
# Display usage
function forwarding_ipv6_usage() {
	echo $"Usage: $0 yes|no [device]"
}


# Control IPv6 forwarding
#  $1: control [yes|no|on|off]
#  $2: network device (if not given, global IPv6 forwarding is set)
function forwarding_ipv6() {
	control=$1
	device=$2		# maybe empty

	if [ -z $control ]; then
		echo $"Missing parameter forwarding control'"
		forwarding_ipv6_usage
		return 1
	fi

	if ! [ "$control" = "yes" -o "$control" = "no" -o "$control" = "on" -o "$control" = "off" ]; then
		echo $"Don't understand forwarding control parameter '$control'"
		forwarding_ipv6_usage
		return 1
	fi
	
	# Device "lo" need no IPv6 configuration
	if [ "$device" = "lo" ]; then
		return 0;
	fi

	# Run IPv6 test
	test_ipv6 || return    


	if [ "$control" = "yes" -o "$control" = "on" ]; then
		status=1
	else
		status=0
	fi

	# Global control? (if no device is given)
	if [ -z $device ]; then
		sysctl -w net.ipv6.conf.all.forwarding=$status >/dev/null 2>&1
	fi
	
	# Per device control
	if [ ! -z $device ]; then
		sysctl -w net.ipv6.conf.$device.forwarding=$status >/dev/null 2>&1
	fi
	
}


##### Static IPv6 route configuration

# Display usage
function ifupdown_ipv6_route_usage() {
	echo $"Usage: $0 IPv6-network IPv6-gateway [device]"
}

# Set static IPv6 route
#  $1: IPv6 network to route
#  $2: IPv6 gateway over which $1 should be routed
#  $3: Interface (optional)
function ifup_ipv6_route() {
	networkipv6=$1
	gatewayipv6=$2
	device=$3		# maybe empty

	if [ -z $networkipv6 ]; then
		echo $"Missing parameter 'IPv6-network'"
		ifupdown_ipv6_route_usage
		return 1
	fi

	if [ -z $gatewayipv6 ]; then
		echo "Missing parameter 'IPv6-gateway'"
		ifupdown_ipv6_route_usage
		return 1
	fi

	# Device "lo" need no IPv6 configuration
	if [ "$device" = "lo" ]; then
		return 0;
	fi
	
	# Run IPv6 test
	test_ipv6 || return    

	
	if [ -z $device ]; then
			route -A inet6 add $networkipv6 gw $gatewayipv6
	else
			route -A inet6 add $networkipv6 gw $gatewayipv6 dev $device
	fi

}

# Delete static IPv6 route
#  $1: IPv6 network to route
#  $2: IPv6 gateway over which $1 should be routed
#  $3: Interface (optional)
function ifdown_ipv6_route() {
	networkipv6=$1
	gatewayipv6=$2
	device=$3		# maybe empty

	if [ -z $networkipv6 ]; then
		echo $"Missing parameter IPv6-network'"
		ifup_ipv6_route_usage
		return 1
	fi

	if [ -z $gatewayipv6 ]; then
		echo $"Missing parameter 'IPv6-gateway'"
		ifup_ipv6_route_usage
		return 1
	fi

	# Device "lo" need no IPv6 configuration
	if [ "$device" = "lo" ]; then
		return 0;
	fi

	# Run IPv6 test
	test_ipv6 || return    

	
	if [ -z $device ]; then
			route -A inet6 del $networkipv6 gw $gatewayipv6
	else
			route -A inet6 del $networkipv6 gw $gatewayipv6 dev $device
	fi

}


##### automatic tunneling configuration

## Configure automatic tunneling up
function ifup_ipv6_autotunnel() {
	
	# Run IPv6 test
	test_ipv6 || return    


	# enable IPv6-over-IPv4 tunnels
	if ifconfig sit0 | grep -q "UP "; then
		# already up, do nothing
		true
	else
		# basic tunnel device to up
			ifconfig sit0 up

			# Switch on forwarding
			forwarding_ipv6 on sit0
	fi
	
}


## Configure automatic tunneling down
function ifdown_ipv6_autotunnel() {

	# Run IPv6 test
	test_ipv6 || return    


	# disable IPv6-over-IPv4 tunnels (if a tunnel is no longer up)
	if route -A inet6 -n | grep sit0 | grep -v -q "^::"; then
		# existing routes, do nothing
		true
	else
		# basic tunnel device to down
			# Switch off forwarding 
			forwarding_ipv6 off sit0
			
			ifconfig sit0 down
	fi

}	


##### static tunneling configuration

function ifupdown_ipv6_tunnel_usage() {
	echo $"Usage: $0 interfacename IPv4-tunneladdress IPv6-route"
}


## Configure static tunnels up
#  $1: Interface (not needed - dummy)
#  $2: IPv4 address of foreign tunnel
#  $3: IPv6 route through this tunnel
function ifup_ipv6_tunnel() {
	device=$1
	addressipv4tunnel=$2
	routeipv6=$3

	if [ -z $device ]; then
		echo $"Missing parameter 'device'"
		ifupdown_ipv6_tunnel_usage
		return 1
	fi

	if [ -z $addressipv4tunnel ]; then
		echo $"Missing parameter 'IPv4-tunneladdress'"
		ifupdown_ipv6_tunnel_usage
		return 1
	fi

	if [ -z $routeipv6 ]; then
		echo $"Missing parameter 'IPv6-route'"
		ifupdown_ipv6_tunnel_usage
		return 1
	fi
	
	# Run IPv6 test
	test_ipv6 || return    


	# enable general IPv6-over-IPv4 tunneling
	ifup_ipv6_autotunnel
	
    	# Set up a tunnel
		route -A inet6 add $routeipv6 gw ::$addressipv4tunnel dev sit0

}	


## Configure static tunnels down
#  $1: Interface (not used - dummy)
#  $2: IPv4 address of foreign tunnel
#  $3: IPv6 route through this tunnel
function ifdown_ipv6_tunnel() {
	device=$1
	addressipv4tunnel=$2
	routeipv6=$3

	if [ -z $device ]; then
		echo $"Missing parameter 'device'"
		ifupdown_ipv6_tunnel_usage
		return 1
	fi

	if [ -z $addressipv4tunnel ]; then
		echo $"Missing parameter 'IPv4-tunneladdress'"
		ifupdown_ipv6_tunnel_usage
		return 1
	fi

	if [ -z $routeipv6 ]; then
		echo $"Missing parameter 'IPv6-route'"
		ifupdown_ipv6_tunnel_usage
		return 1
	fi

	# Run IPv6 test
	test_ipv6 || return    


		# Set up a tunnel
		route -A inet6 del $routeipv6 gw ::$addressipv4tunnel dev sit0

	# disable IPv6-over-IPv4 tunneling (if no longer a tunnel is up)
	ifdown_ipv6_autotunnel

}	


##### Interface configuration
function ifupdown_ipv6_usage() {
	echo $"Usage: $0 interfacename IPv6-address [IPv6-prefixlength]"
}

## Add an IPv6 address for given interface
#  $1: Interface 
#  $2: IPv6 address
#  $3: IPv6 prefix length (optional)
function ifup_ipv6_real() {
	device=$1
	address=$2
	prefixlength=$3

	if [ -z $device ]; then
		echo $"Missing parameter 'device'"
		ifupdown_ipv6_usage
		return 1
	fi

   	# Device "lo" need no IPv6 configuration
   	if [ "$device" = "lo" ]; then
		return 0;
	fi

	if [ -z $address ]; then
		echo $"Missing parameter 'IPv6-address'"
		ifupdown_ipv6_usage
		return 1
	fi

	# Test status of interface
	if ifconfig $device | grep -q "UP "; then
		# Interface is up
			true
	else
		# no IPv4 for this interface, interface is still down, do up ...
		ifconfig $device up
	fi

	# Extract address parts
	prefixlength_implicit="`echo $address | awk -F/ '{ print $2 }'`"
	address_implicit="`echo $address | awk -F/ '{ print $1 }'`"

	# Overwrite optional given one
	if [ ! -z $prefixlength_implicit ]; then
		prefixlength=$prefixlength_implicit
	elif [ -z $prefixlength ]; then
		prefixlength=128
	fi

	# Build IPv6 address
	address="$address_implicit/$prefixlength"

	# Run IPv6 test
	test_ipv6 || return    


	# Only add, if address do not already exist
	address_configured="`ifconfig $device | grep "inet6 addr:" | grep "$address" | awk '{ print $3 }'`"
	address_configured_type="`ifconfig $device | grep "inet6 addr:" | grep "$address" | awk '{ print $4 }'`"

	if [ "$address_configured" = "$address" ]; then
		true
	else
			ifconfig $device add $address || return 2
	fi
    
#		route -A inet6 add $address/$prefixlength dev $device || return 2

}


## Remove all IPv6 routes and addresses for given interface
#   cleanup to prevent kernel crashes
#  $1: Interface 
function ifdown_ipv6_real_all() {
	device=$1

	if [ -z $device ]; then
		echo $"Missing parameter 'device'"
		echo $"Usage: ifdown_ipv6_real_all interfacename"
		return 1
	fi

	# Get all IPv6 routes through given interface and remove them
	route -A inet6 | grep $device | while read ipv6net nexthop flags metric ref use iface args; do
		if [ "$device" = "$iface" ]; then
			if echo $flags | grep -v -q "A"; then
				# Only non addrconf (automatic installed) routes should be removed
				ifdown_ipv6_route $ipv6net $nexthop $iface
			fi
		fi
	done
	
	# Get all IPv6 addresses assigned to given interface and remove them
	ifconfig $device | grep "inet6 addr:" | awk '{ print $3 }' | while read ipv6addr args; do
		ifdown_ipv6_real $device $ipv6addr	
	done
}

## Remove an IPv6 address on given interface
#  $1: Interface 
#  $2: IPv6 address
#  $3: IPv6 prefix length (optional)
function ifdown_ipv6_real() {
	device=$1
	address=$2
	prefixlength=$3

	if [ -z $device ]; then
		echo $"Missing parameter 'device'"
		ifupdown_ipv6_usage
		return 1
	fi

	# Device "lo" need no IPv6 configuration
	if [ "$device" = "lo" ]; then
		return 0;
	fi

	if [ -z $address ]; then
		echo $"Missing parameter 'IPv6-address'"
		ifupdown_ipv6_usage
		return 1
	fi

	# Extract address parts
	prefixlength_implicit="`echo $address | awk -F/ '{ print $2 }'`"
	address_implicit="`echo $address | awk -F/ '{ print $1 }'`"

	# Overwrite optional given one
	if [ ! -z $prefixlength_implicit ]; then
		prefixlength=$prefixlength_implicit
	elif [ -z $prefixlength ]; then
		prefixlength=128
	fi

	# Build IPv6 address
	address="$address_implicit/$prefixlength"

	# Run IPv6 test
	test_ipv6 || return    


#	
#		route -A inet6 del $address/$prefixlength dev $device || return 2

	# Only remove, if address exists and is not link-local (prevents from kernel crashing)
	address_configured="`ifconfig $device | grep "inet6 addr:" | grep "$address" | awk '{ print $3 }'`"
	address_configured_type="`ifconfig $device | grep "inet6 addr:" | grep "$address" | awk '{ print $4 }'`"
	if [ ! -z "$address_configured" ]; then
		if [ "$address_configured_type" = "Scope:Link" ]; then
			true
		else
				ifconfig $device del $address || return 2
		fi
	else
		true
	fi
    
}