#!/bin/bash # SPDX-License-Identifier: GPL-2.0 # # Check xfrm policy resolution. Topology: # # 1.2 1.1 3.1 3.10 2.1 2.2 # eth1 eth1 veth0 veth0 eth1 eth1 # ns1 ---- ns3 ----- ns4 ---- ns2 # # ns3 and ns4 are connected via ipsec tunnel. # pings from ns1 to ns2 (and vice versa) are supposed to work like this: # ns1: ping 10.0.2.2: passes via ipsec tunnel. # ns2: ping 10.0.1.2: passes via ipsec tunnel. # ns1: ping 10.0.1.253: passes via ipsec tunnel (direct policy) # ns2: ping 10.0.2.253: passes via ipsec tunnel (direct policy) # # ns1: ping 10.0.2.254: does NOT pass via ipsec tunnel (exception) # ns2: ping 10.0.1.254: does NOT pass via ipsec tunnel (exception) # Kselftest framework requirement - SKIP code is 4. ksft_skip=4 ret=0 policy_checks_ok=1 KEY_SHA=0xdeadbeef1234567890abcdefabcdefabcdefabcd KEY_AES=0x0123456789abcdef0123456789012345 SPI1=0x1 SPI2=0x2 do_esp_policy() { local ns=$1 local me=$2 local remote=$3 local lnet=$4 local rnet=$5 # to encrypt packets as they go out (includes forwarded packets that need encapsulation) 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 # to fwd decrypted packets after esp processing: 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 } do_esp() { local ns=$1 local me=$2 local remote=$3 local lnet=$4 local rnet=$5 local spi_out=$6 local spi_in=$7 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 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 do_esp_policy $ns $me $remote $lnet $rnet } # add policies with different netmasks, to make sure kernel carries # the policies contained within new netmask over when search tree is # re-built. # peer netns that are supposed to be encapsulated via esp have addresses # in the 10.0.1.0/24 and 10.0.2.0/24 subnets, respectively. # # Adding a policy for '10.0.1.0/23' will make it necessary to # alter the prefix of 10.0.1.0 subnet. # In case new prefix overlaps with existing node, the node and all # policies it carries need to be merged with the existing one(s). # # Do that here. do_overlap() { local ns=$1 # adds new nodes to tree (neither network exists yet in policy database). ip -net $ns xfrm policy add src 10.1.0.0/24 dst 10.0.0.0/24 dir fwd priority 200 action block # adds a new node in the 10.0.0.0/24 tree (dst node exists). ip -net $ns xfrm policy add src 10.2.0.0/24 dst 10.0.0.0/24 dir fwd priority 200 action block # adds a 10.2.0.0/23 node, but for different dst. ip -net $ns xfrm policy add src 10.2.0.0/23 dst 10.0.1.0/24 dir fwd priority 200 action block # dst now overlaps with the 10.0.1.0/24 ESP policy in fwd. # kernel must 'promote' existing one (10.0.0.0/24) to 10.0.0.0/23. # But 10.0.0.0/23 also includes existing 10.0.1.0/24, so that node # also has to be merged too, including source-sorted subtrees. # old: # 10.0.0.0/24 (node 1 in dst tree of the bin) # 10.1.0.0/24 (node in src tree of dst node 1) # 10.2.0.0/24 (node in src tree of dst node 1) # 10.0.1.0/24 (node 2 in dst tree of the bin) # 10.0.2.0/24 (node in src tree of dst node 2) # 10.2.0.0/24 (node in src tree of dst node 2) # # The next 'policy add' adds dst '10.0.0.0/23', which means # that dst node 1 and dst node 2 have to be merged including # the sub-tree. As no duplicates are allowed, policies in # the two '10.0.2.0/24' are also merged. # # after the 'add', internal search tree should look like this: # 10.0.0.0/23 (node in dst tree of bin) # 10.0.2.0/24 (node in src tree of dst node) # 10.1.0.0/24 (node in src tree of dst node) # 10.2.0.0/24 (node in src tree of dst node) # # 10.0.0.0/24 and 10.0.1.0/24 nodes have been merged as 10.0.0.0/23. ip -net $ns xfrm policy add src 10.1.0.0/24 dst 10.0.0.0/23 dir fwd priority 200 action block # similar to above: add policies (with partially random address), with shrinking prefixes. for p in 29 28 27;do for k in $(seq 1 32); do 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 done done } do_esp_policy_get_check() { local ns=$1 local lnet=$2 local rnet=$3 ip -net $ns xfrm policy get src $lnet dst $rnet dir out > /dev/null if [ $? -ne 0 ] && [ $policy_checks_ok -eq 1 ] ;then policy_checks_ok=0 echo "FAIL: ip -net $ns xfrm policy get src $lnet dst $rnet dir out" ret=1 fi ip -net $ns xfrm policy get src $rnet dst $lnet dir fwd > /dev/null if [ $? -ne 0 ] && [ $policy_checks_ok -eq 1 ] ;then policy_checks_ok=0 echo "FAIL: ip -net $ns xfrm policy get src $rnet dst $lnet dir fwd" ret=1 fi } do_exception() { local ns=$1 local me=$2 local remote=$3 local encryptip=$4 local plain=$5 # network $plain passes without tunnel ip -net $ns xfrm policy add dst $plain dir out priority 10 action allow # direct policy for $encryptip, use tunnel, higher prio takes precedence ip -net $ns xfrm policy add dst $encryptip dir out tmpl src $me dst $remote proto esp mode tunnel priority 1 action allow } # policies that are not supposed to match any packets generated in this test. do_dummies4() { local ns=$1 for i in $(seq 10 16);do # dummy policy with wildcard src/dst. echo netns exec $ns ip xfrm policy add src 0.0.0.0/0 dst 10.$i.99.0/30 dir out action block echo netns exec $ns ip xfrm policy add src 10.$i.99.0/30 dst 0.0.0.0/0 dir out action block for j in $(seq 32 64);do echo netns exec $ns ip xfrm policy add src 10.$i.1.0/30 dst 10.$i.$j.0/30 dir out action block # silly, as it encompasses the one above too, but its allowed: echo netns exec $ns ip xfrm policy add src 10.$i.1.0/29 dst 10.$i.$j.0/29 dir out action block # and yet again, even more broad one. echo netns exec $ns ip xfrm policy add src 10.$i.1.0/24 dst 10.$i.$j.0/24 dir out action block echo netns exec $ns ip xfrm policy add src 10.$i.$j.0/24 dst 10.$i.1.0/24 dir fwd action block done done | ip -batch /dev/stdin } do_dummies6() { local ns=$1 for i in $(seq 10 16);do for j in $(seq 32 64);do echo netns exec $ns ip xfrm policy add src dead:$i::/64 dst dead:$i:$j::/64 dir out action block echo netns exec $ns ip xfrm policy add src dead:$i:$j::/64 dst dead:$i::/24 dir fwd action block done done | ip -batch /dev/stdin } check_ipt_policy_count() { ns=$1 ip netns exec $ns iptables-save -c |grep policy | ( read c rest ip netns exec $ns iptables -Z if [ x"$c" = x'[0:0]' ]; then exit 0 elif [ x"$c" = x ]; then echo "ERROR: No counters" ret=1 exit 111 else exit 1 fi ) } check_xfrm() { # 0: iptables -m policy rule count == 0 # 1: iptables -m policy rule count != 0 rval=$1 ip=$2 lret=0 ip netns exec ns1 ping -q -c 1 10.0.2.$ip > /dev/null check_ipt_policy_count ns3 if [ $? -ne $rval ] ; then lret=1 fi check_ipt_policy_count ns4 if [ $? -ne $rval ] ; then lret=1 fi ip netns exec ns2 ping -q -c 1 10.0.1.$ip > /dev/null check_ipt_policy_count ns3 if [ $? -ne $rval ] ; then lret=1 fi check_ipt_policy_count ns4 if [ $? -ne $rval ] ; then lret=1 fi return $lret } check_exceptions() { logpostfix="$1" local lret=0 # ping to .254 should be excluded from the tunnel (exception is in place). check_xfrm 0 254 if [ $? -ne 0 ]; then echo "FAIL: expected ping to .254 to fail ($logpostfix)" lret=1 else echo "PASS: ping to .254 bypassed ipsec tunnel ($logpostfix)" fi # ping to .253 should use use ipsec due to direct policy exception. check_xfrm 1 253 if [ $? -ne 0 ]; then echo "FAIL: expected ping to .253 to use ipsec tunnel ($logpostfix)" lret=1 else echo "PASS: direct policy matches ($logpostfix)" fi # ping to .2 should use ipsec. check_xfrm 1 2 if [ $? -ne 0 ]; then echo "FAIL: expected ping to .2 to use ipsec tunnel ($logpostfix)" lret=1 else echo "PASS: policy matches ($logpostfix)" fi return $lret } check_hthresh_repeat() { local log=$1 i=0 for i in $(seq 1 10);do ip -net ns1 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 ip -net ns1 xfrm policy set hthresh6 0 28 || break ip -net ns1 xfrm policy update src e000:0001::0000 dst ff01::01 dir in tmpl src :: dst :: proto esp mode tunnel priority 100 action allow || break ip -net ns1 xfrm policy set hthresh6 0 28 || break done if [ $i -ne 10 ] ;then echo "FAIL: $log" 1>&2 ret=1 return 1 fi echo "PASS: $log" return 0 } #check for needed privileges if [ "$(id -u)" -ne 0 ];then echo "SKIP: Need root privileges" exit $ksft_skip fi ip -Version 2>/dev/null >/dev/null if [ $? -ne 0 ];then echo "SKIP: Could not run test without the ip tool" exit $ksft_skip fi # needed to check if policy lookup got valid ipsec result iptables --version 2>/dev/null >/dev/null if [ $? -ne 0 ];then echo "SKIP: Could not run test without iptables tool" exit $ksft_skip fi for i in 1 2 3 4; do ip netns add ns$i ip -net ns$i link set lo up done DEV=veth0 ip link add $DEV netns ns1 type veth peer name eth1 netns ns3 ip link add $DEV netns ns2 type veth peer name eth1 netns ns4 ip link add $DEV netns ns3 type veth peer name veth0 netns ns4 DEV=veth0 for i in 1 2; do ip -net ns$i link set $DEV up ip -net ns$i addr add 10.0.$i.2/24 dev $DEV ip -net ns$i addr add dead:$i::2/64 dev $DEV ip -net ns$i addr add 10.0.$i.253 dev $DEV ip -net ns$i addr add 10.0.$i.254 dev $DEV ip -net ns$i addr add dead:$i::fd dev $DEV ip -net ns$i addr add dead:$i::fe dev $DEV done for i in 3 4; do ip -net ns$i link set eth1 up ip -net ns$i link set veth0 up done ip -net ns1 route add default via 10.0.1.1 ip -net ns2 route add default via 10.0.2.1 ip -net ns3 addr add 10.0.1.1/24 dev eth1 ip -net ns3 addr add 10.0.3.1/24 dev veth0 ip -net ns3 addr add 2001:1::1/64 dev eth1 ip -net ns3 addr add 2001:3::1/64 dev veth0 ip -net ns3 route add default via 10.0.3.10 ip -net ns4 addr add 10.0.2.1/24 dev eth1 ip -net ns4 addr add 10.0.3.10/24 dev veth0 ip -net ns4 addr add 2001:2::1/64 dev eth1 ip -net ns4 addr add 2001:3::10/64 dev veth0 ip -net ns4 route add default via 10.0.3.1 for j in 4 6; do for i in 3 4;do ip netns exec ns$i sysctl net.ipv$j.conf.eth1.forwarding=1 > /dev/null ip netns exec ns$i sysctl net.ipv$j.conf.veth0.forwarding=1 > /dev/null done done # abuse iptables rule counter to check if ping matches a policy ip netns exec ns3 iptables -p icmp -A FORWARD -m policy --dir out --pol ipsec ip netns exec ns4 iptables -p icmp -A FORWARD -m policy --dir out --pol ipsec if [ $? -ne 0 ];then echo "SKIP: Could not insert iptables rule" for i in 1 2 3 4;do ip netns del ns$i;done exit $ksft_skip fi # localip remoteip localnet remotenet do_esp ns3 10.0.3.1 10.0.3.10 10.0.1.0/24 10.0.2.0/24 $SPI1 $SPI2 do_esp ns3 dead:3::1 dead:3::10 dead:1::/64 dead:2::/64 $SPI1 $SPI2 do_esp ns4 10.0.3.10 10.0.3.1 10.0.2.0/24 10.0.1.0/24 $SPI2 $SPI1 do_esp ns4 dead:3::10 dead:3::1 dead:2::/64 dead:1::/64 $SPI2 $SPI1 do_dummies4 ns3 do_dummies6 ns4 do_esp_policy_get_check ns3 10.0.1.0/24 10.0.2.0/24 do_esp_policy_get_check ns4 10.0.2.0/24 10.0.1.0/24 do_esp_policy_get_check ns3 dead:1::/64 dead:2::/64 do_esp_policy_get_check ns4 dead:2::/64 dead:1::/64 # ping to .254 should use ipsec, exception is not installed. check_xfrm 1 254 if [ $? -ne 0 ]; then echo "FAIL: expected ping to .254 to use ipsec tunnel" ret=1 else echo "PASS: policy before exception matches" fi # installs exceptions # localip remoteip encryptdst plaindst do_exception ns3 10.0.3.1 10.0.3.10 10.0.2.253 10.0.2.240/28 do_exception ns4 10.0.3.10 10.0.3.1 10.0.1.253 10.0.1.240/28 do_exception ns3 dead:3::1 dead:3::10 dead:2::fd dead:2:f0::/96 do_exception ns4 dead:3::10 dead:3::1 dead:1::fd dead:1:f0::/96 check_exceptions "exceptions" if [ $? -ne 0 ]; then ret=1 fi # insert block policies with adjacent/overlapping netmasks do_overlap ns3 check_exceptions "exceptions and block policies" if [ $? -ne 0 ]; then ret=1 fi for n in ns3 ns4;do ip -net $n xfrm policy set hthresh4 28 24 hthresh6 126 125 sleep $((RANDOM%5)) done check_exceptions "exceptions and block policies after hresh changes" # full flush of policy db, check everything gets freed incl. internal meta data ip -net ns3 xfrm policy flush do_esp_policy ns3 10.0.3.1 10.0.3.10 10.0.1.0/24 10.0.2.0/24 do_exception ns3 10.0.3.1 10.0.3.10 10.0.2.253 10.0.2.240/28 # move inexact policies to hash table ip -net ns3 xfrm policy set hthresh4 16 16 sleep $((RANDOM%5)) check_exceptions "exceptions and block policies after hthresh change in ns3" # restore original hthresh settings -- move policies back to tables for n in ns3 ns4;do ip -net $n xfrm policy set hthresh4 32 32 hthresh6 128 128 sleep $((RANDOM%5)) done check_exceptions "exceptions and block policies after htresh change to normal" check_hthresh_repeat "policies with repeated htresh change" for i in 1 2 3 4;do ip netns del ns$i;done exit $ret