1 #!/bin/bash
2 # SPDX-License-Identifier: GPL-2.0
3 #
4 # Check xfrm policy resolution. Topology:
5 #
6 # 1.2 1.1 3.1 3.10 2.1 2.2
7 # eth1 eth1 veth0 veth0 eth1 eth1
8 # ns1 ---- ns3 ----- ns4 ---- ns2
9 #
10 # ns3 and ns4 are connected via ipsec tunnel.
11 # pings from ns1 to ns2 (and vice versa) are supposed to work like this:
12 # ns1: ping 10.0.2.2: passes via ipsec tunnel.
13 # ns2: ping 10.0.1.2: passes via ipsec tunnel.
14
15 # ns1: ping 10.0.1.253: passes via ipsec tunnel (direct policy)
16 # ns2: ping 10.0.2.253: passes via ipsec tunnel (direct policy)
17 #
18 # ns1: ping 10.0.2.254: does NOT pass via ipsec tunnel (exception)
19 # ns2: ping 10.0.1.254: does NOT pass via ipsec tunnel (exception)
20
21 source lib.sh
22 ret=0
23 policy_checks_ok=1
24
25 KEY_SHA=0xdeadbeef1234567890abcdefabcdefabcdefabcd
26 KEY_AES=0x0123456789abcdef0123456789012345
27 SPI1=0x1
28 SPI2=0x2
29
30 do_esp_policy() {
31 local ns=$1
32 local me=$2
33 local remote=$3
34 local lnet=$4
35 local rnet=$5
36
37 # to encrypt packets as they go out (includes forwarded packets that need encapsulation)
38 ip -net $ns xfrm policy add src $lnet dst $rnet dir out tmpl src $me dst $remote proto esp mode tunnel priority 100 action allow
39 # to fwd decrypted packets after esp processing:
40 ip -net $ns xfrm policy add src $rnet dst $lnet dir fwd tmpl src $remote dst $me proto esp mode tunnel priority 100 action allow
41 }
42
43 do_esp() {
44 local ns=$1
45 local me=$2
46 local remote=$3
47 local lnet=$4
48 local rnet=$5
49 local spi_out=$6
50 local spi_in=$7
51
52 ip -net $ns xfrm state add src $remote dst $me proto esp spi $spi_in enc aes $KEY_AES auth sha1 $KEY_SHA mode tunnel sel src $rnet dst $lnet
53 ip -net $ns xfrm state add src $me dst $remote proto esp spi $spi_out enc aes $KEY_AES auth sha1 $KEY_SHA mode tunnel sel src $lnet dst $rnet
54
55 do_esp_policy $ns $me $remote $lnet $rnet
56 }
57
58 # add policies with different netmasks, to make sure kernel carries
59 # the policies contained within new netmask over when search tree is
60 # re-built.
61 # peer netns that are supposed to be encapsulated via esp have addresses
62 # in the 10.0.1.0/24 and 10.0.2.0/24 subnets, respectively.
63 #
64 # Adding a policy for '10.0.1.0/23' will make it necessary to
65 # alter the prefix of 10.0.1.0 subnet.
66 # In case new prefix overlaps with existing node, the node and all
67 # policies it carries need to be merged with the existing one(s).
68 #
69 # Do that here.
70 do_overlap()
71 {
72 local ns=$1
73
74 # adds new nodes to tree (neither network exists yet in policy database).
75 ip -net $ns xfrm policy add src 10.1.0.0/24 dst 10.0.0.0/24 dir fwd priority 200 action block
76
77 # adds a new node in the 10.0.0.0/24 tree (dst node exists).
78 ip -net $ns xfrm policy add src 10.2.0.0/24 dst 10.0.0.0/24 dir fwd priority 200 action block
79
80 # adds a 10.2.0.0/23 node, but for different dst.
81 ip -net $ns xfrm policy add src 10.2.0.0/23 dst 10.0.1.0/24 dir fwd priority 200 action block
82
83 # dst now overlaps with the 10.0.1.0/24 ESP policy in fwd.
84 # kernel must 'promote' existing one (10.0.0.0/24) to 10.0.0.0/23.
85 # But 10.0.0.0/23 also includes existing 10.0.1.0/24, so that node
86 # also has to be merged too, including source-sorted subtrees.
87 # old:
88 # 10.0.0.0/24 (node 1 in dst tree of the bin)
89 # 10.1.0.0/24 (node in src tree of dst node 1)
90 # 10.2.0.0/24 (node in src tree of dst node 1)
91 # 10.0.1.0/24 (node 2 in dst tree of the bin)
92 # 10.0.2.0/24 (node in src tree of dst node 2)
93 # 10.2.0.0/24 (node in src tree of dst node 2)
94 #
95 # The next 'policy add' adds dst '10.0.0.0/23', which means
96 # that dst node 1 and dst node 2 have to be merged including
97 # the sub-tree. As no duplicates are allowed, policies in
98 # the two '10.0.2.0/24' are also merged.
99 #
100 # after the 'add', internal search tree should look like this:
101 # 10.0.0.0/23 (node in dst tree of bin)
102 # 10.0.2.0/24 (node in src tree of dst node)
103 # 10.1.0.0/24 (node in src tree of dst node)
104 # 10.2.0.0/24 (node in src tree of dst node)
105 #
106 # 10.0.0.0/24 and 10.0.1.0/24 nodes have been merged as 10.0.0.0/23.
107 ip -net $ns xfrm policy add src 10.1.0.0/24 dst 10.0.0.0/23 dir fwd priority 200 action block
108
109 # similar to above: add policies (with partially random address), with shrinking prefixes.
110 for p in 29 28 27;do
111 for k in $(seq 1 32); do
112 ip -net $ns xfrm policy add src 10.253.1.$((RANDOM%255))/$p dst 10.254.1.$((RANDOM%255))/$p dir fwd priority $((200+k)) action block 2>/dev/null
113 done
114 done
115 }
116
117 do_esp_policy_get_check() {
118 local ns=$1
119 local lnet=$2
120 local rnet=$3
121
122 ip -net $ns xfrm policy get src $lnet dst $rnet dir out > /dev/null
123 if [ $? -ne 0 ] && [ $policy_checks_ok -eq 1 ] ;then
124 policy_checks_ok=0
125 echo "FAIL: ip -net $ns xfrm policy get src $lnet dst $rnet dir out"
126 ret=1
127 fi
128
129 ip -net $ns xfrm policy get src $rnet dst $lnet dir fwd > /dev/null
130 if [ $? -ne 0 ] && [ $policy_checks_ok -eq 1 ] ;then
131 policy_checks_ok=0
132 echo "FAIL: ip -net $ns xfrm policy get src $rnet dst $lnet dir fwd"
133 ret=1
134 fi
135 }
136
137 do_exception() {
138 local ns=$1
139 local me=$2
140 local remote=$3
141 local encryptip=$4
142 local plain=$5
143
144 # network $plain passes without tunnel
145 ip -net $ns xfrm policy add dst $plain dir out priority 10 action allow
146
147 # direct policy for $encryptip, use tunnel, higher prio takes precedence
148 ip -net $ns xfrm policy add dst $encryptip dir out tmpl src $me dst $remote proto esp mode tunnel priority 1 action allow
149 }
150
151 # policies that are not supposed to match any packets generated in this test.
152 do_dummies4() {
153 local ns=$1
154
155 for i in $(seq 10 16);do
156 # dummy policy with wildcard src/dst.
157 echo netns exec $ns ip xfrm policy add src 0.0.0.0/0 dst 10.$i.99.0/30 dir out action block
158 echo netns exec $ns ip xfrm policy add src 10.$i.99.0/30 dst 0.0.0.0/0 dir out action block
159 for j in $(seq 32 64);do
160 echo netns exec $ns ip xfrm policy add src 10.$i.1.0/30 dst 10.$i.$j.0/30 dir out action block
161 # silly, as it encompasses the one above too, but its allowed:
162 echo netns exec $ns ip xfrm policy add src 10.$i.1.0/29 dst 10.$i.$j.0/29 dir out action block
163 # and yet again, even more broad one.
164 echo netns exec $ns ip xfrm policy add src 10.$i.1.0/24 dst 10.$i.$j.0/24 dir out action block
165 echo netns exec $ns ip xfrm policy add src 10.$i.$j.0/24 dst 10.$i.1.0/24 dir fwd action block
166 done
167 done | ip -batch /dev/stdin
168 }
169
170 do_dummies6() {
171 local ns=$1
172
173 for i in $(seq 10 16);do
174 for j in $(seq 32 64);do
175 echo netns exec $ns ip xfrm policy add src dead:$i::/64 dst dead:$i:$j::/64 dir out action block
176 echo netns exec $ns ip xfrm policy add src dead:$i:$j::/64 dst dead:$i::/24 dir fwd action block
177 done
178 done | ip -batch /dev/stdin
179 }
180
181 check_ipt_policy_count()
182 {
183 ns=$1
184
185 ip netns exec $ns iptables-save -c |grep policy | ( read c rest
186 ip netns exec $ns iptables -Z
187 if [ x"$c" = x'[0:0]' ]; then
188 exit 0
189 elif [ x"$c" = x ]; then
190 echo "ERROR: No counters"
191 ret=1
192 exit 111
193 else
194 exit 1
195 fi
196 )
197 }
198
199 check_xfrm() {
200 # 0: iptables -m policy rule count == 0
201 # 1: iptables -m policy rule count != 0
202 rval=$1
203 ip=$2
204 local lret=0
205
206 ip netns exec ${ns[1]} ping -q -c 1 10.0.2.$ip > /dev/null
207
208 check_ipt_policy_count ${ns[3]}
209 if [ $? -ne $rval ] ; then
210 lret=1
211 fi
212 check_ipt_policy_count ${ns[4]}
213 if [ $? -ne $rval ] ; then
214 lret=1
215 fi
216
217 ip netns exec ${ns[2]} ping -q -c 1 10.0.1.$ip > /dev/null
218
219 check_ipt_policy_count ${ns[3]}
220 if [ $? -ne $rval ] ; then
221 lret=1
222 fi
223 check_ipt_policy_count ${ns[4]}
224 if [ $? -ne $rval ] ; then
225 lret=1
226 fi
227
228 return $lret
229 }
230
231 check_exceptions()
232 {
233 logpostfix="$1"
234 local lret=0
235
236 # ping to .254 should be excluded from the tunnel (exception is in place).
237 check_xfrm 0 254
238 if [ $? -ne 0 ]; then
239 echo "FAIL: expected ping to .254 to fail ($logpostfix)"
240 lret=1
241 else
242 echo "PASS: ping to .254 bypassed ipsec tunnel ($logpostfix)"
243 fi
244
245 # ping to .253 should use use ipsec due to direct policy exception.
246 check_xfrm 1 253
247 if [ $? -ne 0 ]; then
248 echo "FAIL: expected ping to .253 to use ipsec tunnel ($logpostfix)"
249 lret=1
250 else
251 echo "PASS: direct policy matches ($logpostfix)"
252 fi
253
254 # ping to .2 should use ipsec.
255 check_xfrm 1 2
256 if [ $? -ne 0 ]; then
257 echo "FAIL: expected ping to .2 to use ipsec tunnel ($logpostfix)"
258 lret=1
259 else
260 echo "PASS: policy matches ($logpostfix)"
261 fi
262
263 return $lret
264 }
265
266 check_hthresh_repeat()
267 {
268 local log=$1
269 i=0
270
271 for i in $(seq 1 10);do
272 ip -net ${ns[1]} xfrm policy update src e000:0001::0000 dst ff01::0014:0000:0001 dir in tmpl src :: dst :: proto esp mode tunnel priority 100 action allow || break
273 ip -net ${ns[1]} xfrm policy set hthresh6 0 28 || break
274
275 ip -net ${ns[1]} xfrm policy update src e000:0001::0000 dst ff01::01 dir in tmpl src :: dst :: proto esp mode tunnel priority 100 action allow || break
276 ip -net ${ns[1]} xfrm policy set hthresh6 0 28 || break
277 done
278
279 if [ $i -ne 10 ] ;then
280 echo "FAIL: $log" 1>&2
281 ret=1
282 return 1
283 fi
284
285 echo "PASS: $log"
286 return 0
287 }
288
289 # insert non-overlapping policies in a random order and check that
290 # all of them can be fetched using the traffic selectors.
291 check_random_order()
292 {
293 local ns=$1
294 local log=$2
295
296 for i in $(seq 50); do
297 ip -net $ns xfrm policy flush
298 for j in $(seq 0 16 255 | sort -R); do
299 ip -net $ns xfrm policy add dst $j.0.0.0/24 dir out priority 10 action allow
300 done
301 for j in $(seq 0 16 255); do
302 if ! ip -net $ns xfrm policy get dst $j.0.0.0/24 dir out > /dev/null; then
303 echo "FAIL: $log" 1>&2
304 return 1
305 fi
306 done
307 done
308
309 for i in $(seq 50); do
310 ip -net $ns xfrm policy flush
311 for j in $(seq 0 16 255 | sort -R); do
312 local addr=$(printf "e000:0000:%02x00::/56" $j)
313 ip -net $ns xfrm policy add dst $addr dir out priority 10 action allow
314 done
315 for j in $(seq 0 16 255); do
316 local addr=$(printf "e000:0000:%02x00::/56" $j)
317 if ! ip -net $ns xfrm policy get dst $addr dir out > /dev/null; then
318 echo "FAIL: $log" 1>&2
319 return 1
320 fi
321 done
322 done
323
324 ip -net $ns xfrm policy flush
325
326 echo "PASS: $log"
327 return 0
328 }
329
330 #check for needed privileges
331 if [ "$(id -u)" -ne 0 ];then
332 echo "SKIP: Need root privileges"
333 exit $ksft_skip
334 fi
335
336 ip -Version 2>/dev/null >/dev/null
337 if [ $? -ne 0 ];then
338 echo "SKIP: Could not run test without the ip tool"
339 exit $ksft_skip
340 fi
341
342 # needed to check if policy lookup got valid ipsec result
343 iptables --version 2>/dev/null >/dev/null
344 if [ $? -ne 0 ];then
345 echo "SKIP: Could not run test without iptables tool"
346 exit $ksft_skip
347 fi
348
349 setup_ns ns1 ns2 ns3 ns4
350 ns[1]=$ns1
351 ns[2]=$ns2
352 ns[3]=$ns3
353 ns[4]=$ns4
354
355 DEV=veth0
356 ip link add $DEV netns ${ns[1]} type veth peer name eth1 netns ${ns[3]}
357 ip link add $DEV netns ${ns[2]} type veth peer name eth1 netns ${ns[4]}
358
359 ip link add $DEV netns ${ns[3]} type veth peer name veth0 netns ${ns[4]}
360
361 DEV=veth0
362 for i in 1 2; do
363 ip -net ${ns[$i]} link set $DEV up
364 ip -net ${ns[$i]} addr add 10.0.$i.2/24 dev $DEV
365 ip -net ${ns[$i]} addr add dead:$i::2/64 dev $DEV
366
367 ip -net ${ns[$i]} addr add 10.0.$i.253 dev $DEV
368 ip -net ${ns[$i]} addr add 10.0.$i.254 dev $DEV
369 ip -net ${ns[$i]} addr add dead:$i::fd dev $DEV
370 ip -net ${ns[$i]} addr add dead:$i::fe dev $DEV
371 done
372
373 for i in 3 4; do
374 ip -net ${ns[$i]} link set eth1 up
375 ip -net ${ns[$i]} link set veth0 up
376 done
377
378 ip -net ${ns[1]} route add default via 10.0.1.1
379 ip -net ${ns[2]} route add default via 10.0.2.1
380
381 ip -net ${ns[3]} addr add 10.0.1.1/24 dev eth1
382 ip -net ${ns[3]} addr add 10.0.3.1/24 dev veth0
383 ip -net ${ns[3]} addr add 2001:1::1/64 dev eth1
384 ip -net ${ns[3]} addr add 2001:3::1/64 dev veth0
385
386 ip -net ${ns[3]} route add default via 10.0.3.10
387
388 ip -net ${ns[4]} addr add 10.0.2.1/24 dev eth1
389 ip -net ${ns[4]} addr add 10.0.3.10/24 dev veth0
390 ip -net ${ns[4]} addr add 2001:2::1/64 dev eth1
391 ip -net ${ns[4]} addr add 2001:3::10/64 dev veth0
392 ip -net ${ns[4]} route add default via 10.0.3.1
393
394 for j in 4 6; do
395 for i in 3 4;do
396 ip netns exec ${ns[$i]} sysctl net.ipv$j.conf.eth1.forwarding=1 > /dev/null
397 ip netns exec ${ns[$i]} sysctl net.ipv$j.conf.veth0.forwarding=1 > /dev/null
398 done
399 done
400
401 # abuse iptables rule counter to check if ping matches a policy
402 ip netns exec ${ns[3]} iptables -p icmp -A FORWARD -m policy --dir out --pol ipsec
403 ip netns exec ${ns[4]} iptables -p icmp -A FORWARD -m policy --dir out --pol ipsec
404 if [ $? -ne 0 ];then
405 echo "SKIP: Could not insert iptables rule"
406 cleanup_ns $ns1 $ns2 $ns3 $ns4
407 exit $ksft_skip
408 fi
409
410 # localip remoteip localnet remotenet
411 do_esp ${ns[3]} 10.0.3.1 10.0.3.10 10.0.1.0/24 10.0.2.0/24 $SPI1 $SPI2
412 do_esp ${ns[3]} dead:3::1 dead:3::10 dead:1::/64 dead:2::/64 $SPI1 $SPI2
413 do_esp ${ns[4]} 10.0.3.10 10.0.3.1 10.0.2.0/24 10.0.1.0/24 $SPI2 $SPI1
414 do_esp ${ns[4]} dead:3::10 dead:3::1 dead:2::/64 dead:1::/64 $SPI2 $SPI1
415
416 do_dummies4 ${ns[3]}
417 do_dummies6 ${ns[4]}
418
419 do_esp_policy_get_check ${ns[3]} 10.0.1.0/24 10.0.2.0/24
420 do_esp_policy_get_check ${ns[4]} 10.0.2.0/24 10.0.1.0/24
421 do_esp_policy_get_check ${ns[3]} dead:1::/64 dead:2::/64
422 do_esp_policy_get_check ${ns[4]} dead:2::/64 dead:1::/64
423
424 # ping to .254 should use ipsec, exception is not installed.
425 check_xfrm 1 254
426 if [ $? -ne 0 ]; then
427 echo "FAIL: expected ping to .254 to use ipsec tunnel"
428 ret=1
429 else
430 echo "PASS: policy before exception matches"
431 fi
432
433 # installs exceptions
434 # localip remoteip encryptdst plaindst
435 do_exception ${ns[3]} 10.0.3.1 10.0.3.10 10.0.2.253 10.0.2.240/28
436 do_exception ${ns[4]} 10.0.3.10 10.0.3.1 10.0.1.253 10.0.1.240/28
437
438 do_exception ${ns[3]} dead:3::1 dead:3::10 dead:2::fd dead:2:f0::/96
439 do_exception ${ns[4]} dead:3::10 dead:3::1 dead:1::fd dead:1:f0::/96
440
441 check_exceptions "exceptions"
442 if [ $? -ne 0 ]; then
443 ret=1
444 fi
445
446 # insert block policies with adjacent/overlapping netmasks
447 do_overlap ${ns[3]}
448
449 check_exceptions "exceptions and block policies"
450 if [ $? -ne 0 ]; then
451 ret=1
452 fi
453
454 for n in ${ns[3]} ${ns[4]};do
455 ip -net $n xfrm policy set hthresh4 28 24 hthresh6 126 125
456 sleep $((RANDOM%5))
457 done
458
459 check_exceptions "exceptions and block policies after hresh changes"
460
461 # full flush of policy db, check everything gets freed incl. internal meta data
462 ip -net ${ns[3]} xfrm policy flush
463
464 do_esp_policy ${ns[3]} 10.0.3.1 10.0.3.10 10.0.1.0/24 10.0.2.0/24
465 do_exception ${ns[3]} 10.0.3.1 10.0.3.10 10.0.2.253 10.0.2.240/28
466
467 # move inexact policies to hash table
468 ip -net ${ns[3]} xfrm policy set hthresh4 16 16
469
470 sleep $((RANDOM%5))
471 check_exceptions "exceptions and block policies after hthresh change in ns3"
472
473 # restore original hthresh settings -- move policies back to tables
474 for n in ${ns[3]} ${ns[4]};do
475 ip -net $n xfrm policy set hthresh4 32 32 hthresh6 128 128
476 sleep $((RANDOM%5))
477 done
478 check_exceptions "exceptions and block policies after htresh change to normal"
479
480 check_hthresh_repeat "policies with repeated htresh change"
481
482 check_random_order ${ns[3]} "policies inserted in random order"
483
484 cleanup_ns $ns1 $ns2 $ns3 $ns4
485
486 exit $ret
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