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linux/tools/testing/selftests/net/xfrm_policy.sh
Visa Hankala da64ae2d35 xfrm: Fix wraparound in xfrm_policy_addr_delta() 
Use three-way comparison for address components to avoid integer
wraparound in the result of xfrm_policy_addr_delta(). This ensures
that the search trees are built and traversed correctly.

Treat IPv4 and IPv6 similarly by returning 0 when prefixlen == 0.
Prefix /0 has only one equivalence class.

Fixes: 9cf545ebd5 ("xfrm: policy: store inexact policies in a tree ordered by destination address")
Signed-off-by: Visa Hankala <visa@hankala.org>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2021-01-04 10:35:09 +01:00

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#!/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=$2
local lret=0
ip netns exec ns1 ping -q -c 1 10.0.2.$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
}
# insert non-overlapping policies in a random order and check that
# all of them can be fetched using the traffic selectors.
check_random_order()
{
local ns=$1
local log=$2
for i in $(seq 100); do
ip -net $ns xfrm policy flush
for j in $(seq 0 16 255 | sort -R); do
ip -net $ns xfrm policy add dst $j.0.0.0/24 dir out priority 10 action allow
done
for j in $(seq 0 16 255); do
if ! ip -net $ns xfrm policy get dst $j.0.0.0/24 dir out > /dev/null; then
echo "FAIL: $log" 1>&2
return 1
fi
done
done
for i in $(seq 100); do
ip -net $ns xfrm policy flush
for j in $(seq 0 16 255 | sort -R); do
local addr=$(printf "e000:0000:%02x00::/56" $j)
ip -net $ns xfrm policy add dst $addr dir out priority 10 action allow
done
for j in $(seq 0 16 255); do
local addr=$(printf "e000:0000:%02x00::/56" $j)
if ! ip -net $ns xfrm policy get dst $addr dir out > /dev/null; then
echo "FAIL: $log" 1>&2
return 1
fi
done
done
ip -net $ns xfrm policy flush
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 $((RANDOM%5))
done
check_exceptions "exceptions and block policies after htresh change to normal"
check_hthresh_repeat "policies with repeated htresh change"
check_random_order ns3 "policies inserted in random order"
for i in 1 2 3 4;do ip netns del ns$i;done
exit $ret
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