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