233 lines
8.1 KiB
Bash
233 lines
8.1 KiB
Bash
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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#
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# By Seth Schoen (c) 2021, for the IPv4 Unicast Extensions Project
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# Thanks to David Ahern for help and advice on nettest modifications.
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#
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# Self-tests for IPv4 address extensions: the kernel's ability to accept
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# certain traditionally unused or unallocated IPv4 addresses. For each kind
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# of address, we test for interface assignment, ping, TCP, and forwarding.
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# Must be run as root (to manipulate network namespaces and virtual
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# interfaces).
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#
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# Things we test for here:
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#
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# * Currently the kernel accepts addresses in 0/8 and 240/4 as valid.
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#
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# * Notwithstanding that, 0.0.0.0 and 255.255.255.255 cannot be assigned.
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#
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# * Currently the kernel DOES NOT accept unicast use of the lowest
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# address in an IPv4 subnet (e.g. 192.168.100.0/32 in 192.168.100.0/24).
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# This is treated as a second broadcast address, for compatibility
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# with 4.2BSD (!).
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#
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# * Currently the kernel DOES NOT accept unicast use of any of 127/8.
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#
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# * Currently the kernel DOES NOT accept unicast use of any of 224/4.
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#
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# These tests provide an easy way to flip the expected result of any
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# of these behaviors for testing kernel patches that change them.
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# Kselftest framework requirement - SKIP code is 4.
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ksft_skip=4
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# nettest can be run from PATH or from same directory as this selftest
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if ! which nettest >/dev/null; then
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PATH=$PWD:$PATH
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if ! which nettest >/dev/null; then
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echo "'nettest' command not found; skipping tests"
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exit $ksft_skip
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fi
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fi
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result=0
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hide_output(){ exec 3>&1 4>&2 >/dev/null 2>/dev/null; }
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show_output(){ exec >&3 2>&4; }
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show_result(){
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if [ $1 -eq 0 ]; then
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printf "TEST: %-60s [ OK ]\n" "${2}"
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else
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printf "TEST: %-60s [FAIL]\n" "${2}"
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result=1
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fi
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}
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_do_segmenttest(){
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# Perform a simple set of link tests between a pair of
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# IP addresses on a shared (virtual) segment, using
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# ping and nettest.
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# foo --- bar
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# Arguments: ip_a ip_b prefix_length test_description
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#
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# Caller must set up foo-ns and bar-ns namespaces
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# containing linked veth devices foo and bar,
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# respectively.
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ip -n foo-ns address add $1/$3 dev foo || return 1
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ip -n foo-ns link set foo up || return 1
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ip -n bar-ns address add $2/$3 dev bar || return 1
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ip -n bar-ns link set bar up || return 1
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ip netns exec foo-ns timeout 2 ping -c 1 $2 || return 1
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ip netns exec bar-ns timeout 2 ping -c 1 $1 || return 1
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nettest -B -N bar-ns -O foo-ns -r $1 || return 1
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nettest -B -N foo-ns -O bar-ns -r $2 || return 1
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return 0
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}
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_do_route_test(){
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# Perform a simple set of gateway tests.
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#
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# [foo] <---> [foo1]-[bar1] <---> [bar] /prefix
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# host gateway host
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#
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# Arguments: foo_ip foo1_ip bar1_ip bar_ip prefix_len test_description
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# Displays test result and returns success or failure.
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# Caller must set up foo-ns, bar-ns, and router-ns
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# containing linked veth devices foo-foo1, bar1-bar
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# (foo in foo-ns, foo1 and bar1 in router-ns, and
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# bar in bar-ns).
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ip -n foo-ns address add $1/$5 dev foo || return 1
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ip -n foo-ns link set foo up || return 1
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ip -n foo-ns route add default via $2 || return 1
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ip -n bar-ns address add $4/$5 dev bar || return 1
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ip -n bar-ns link set bar up || return 1
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ip -n bar-ns route add default via $3 || return 1
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ip -n router-ns address add $2/$5 dev foo1 || return 1
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ip -n router-ns link set foo1 up || return 1
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ip -n router-ns address add $3/$5 dev bar1 || return 1
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ip -n router-ns link set bar1 up || return 1
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echo 1 | ip netns exec router-ns tee /proc/sys/net/ipv4/ip_forward
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ip netns exec foo-ns timeout 2 ping -c 1 $2 || return 1
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ip netns exec foo-ns timeout 2 ping -c 1 $4 || return 1
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ip netns exec bar-ns timeout 2 ping -c 1 $3 || return 1
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ip netns exec bar-ns timeout 2 ping -c 1 $1 || return 1
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nettest -B -N bar-ns -O foo-ns -r $1 || return 1
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nettest -B -N foo-ns -O bar-ns -r $4 || return 1
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return 0
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}
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segmenttest(){
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# Sets up veth link and tries to connect over it.
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# Arguments: ip_a ip_b prefix_len test_description
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hide_output
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ip netns add foo-ns
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ip netns add bar-ns
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ip link add foo netns foo-ns type veth peer name bar netns bar-ns
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test_result=0
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_do_segmenttest "$@" || test_result=1
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ip netns pids foo-ns | xargs -r kill -9
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ip netns pids bar-ns | xargs -r kill -9
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ip netns del foo-ns
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ip netns del bar-ns
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show_output
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# inverted tests will expect failure instead of success
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[ -n "$expect_failure" ] && test_result=`expr 1 - $test_result`
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show_result $test_result "$4"
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}
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route_test(){
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# Sets up a simple gateway and tries to connect through it.
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# [foo] <---> [foo1]-[bar1] <---> [bar] /prefix
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# Arguments: foo_ip foo1_ip bar1_ip bar_ip prefix_len test_description
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# Returns success or failure.
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hide_output
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ip netns add foo-ns
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ip netns add bar-ns
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ip netns add router-ns
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ip link add foo netns foo-ns type veth peer name foo1 netns router-ns
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ip link add bar netns bar-ns type veth peer name bar1 netns router-ns
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test_result=0
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_do_route_test "$@" || test_result=1
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ip netns pids foo-ns | xargs -r kill -9
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ip netns pids bar-ns | xargs -r kill -9
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ip netns pids router-ns | xargs -r kill -9
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ip netns del foo-ns
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ip netns del bar-ns
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ip netns del router-ns
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show_output
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# inverted tests will expect failure instead of success
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[ -n "$expect_failure" ] && test_result=`expr 1 - $test_result`
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show_result $test_result "$6"
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}
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echo "###########################################################################"
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echo "Unicast address extensions tests (behavior of reserved IPv4 addresses)"
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echo "###########################################################################"
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#
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# Test support for 240/4
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segmenttest 240.1.2.1 240.1.2.4 24 "assign and ping within 240/4 (1 of 2) (is allowed)"
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segmenttest 250.100.2.1 250.100.30.4 16 "assign and ping within 240/4 (2 of 2) (is allowed)"
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#
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# Test support for 0/8
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segmenttest 0.1.2.17 0.1.2.23 24 "assign and ping within 0/8 (1 of 2) (is allowed)"
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segmenttest 0.77.240.17 0.77.2.23 16 "assign and ping within 0/8 (2 of 2) (is allowed)"
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#
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# Even 255.255/16 is OK!
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segmenttest 255.255.3.1 255.255.50.77 16 "assign and ping inside 255.255/16 (is allowed)"
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#
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# Or 255.255.255/24
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segmenttest 255.255.255.1 255.255.255.254 24 "assign and ping inside 255.255.255/24 (is allowed)"
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#
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# Routing between different networks
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route_test 240.5.6.7 240.5.6.1 255.1.2.1 255.1.2.3 24 "route between 240.5.6/24 and 255.1.2/24 (is allowed)"
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route_test 0.200.6.7 0.200.38.1 245.99.101.1 245.99.200.111 16 "route between 0.200/16 and 245.99/16 (is allowed)"
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#
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# Test support for lowest address ending in .0
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segmenttest 5.10.15.20 5.10.15.0 24 "assign and ping lowest address (/24)"
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#
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# Test support for lowest address not ending in .0
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segmenttest 192.168.101.192 192.168.101.193 26 "assign and ping lowest address (/26)"
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#
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# Routing using lowest address as a gateway/endpoint
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route_test 192.168.42.1 192.168.42.0 9.8.7.6 9.8.7.0 24 "routing using lowest address"
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#
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# ==============================================
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# ==== TESTS THAT CURRENTLY EXPECT FAILURE =====
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# ==============================================
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expect_failure=true
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# It should still not be possible to use 0.0.0.0 or 255.255.255.255
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# as a unicast address. Thus, these tests expect failure.
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segmenttest 0.0.1.5 0.0.0.0 16 "assigning 0.0.0.0 (is forbidden)"
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segmenttest 255.255.255.1 255.255.255.255 16 "assigning 255.255.255.255 (is forbidden)"
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#
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# Test support for not having all of 127 be loopback
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# Currently Linux does not allow this, so this should fail too
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segmenttest 127.99.4.5 127.99.4.6 16 "assign and ping inside 127/8 (is forbidden)"
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#
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# Test support for unicast use of class D
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# Currently Linux does not allow this, so this should fail too
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segmenttest 225.1.2.3 225.1.2.200 24 "assign and ping class D address (is forbidden)"
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#
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# Routing using class D as a gateway
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route_test 225.1.42.1 225.1.42.2 9.8.7.6 9.8.7.1 24 "routing using class D (is forbidden)"
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#
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# Routing using 127/8
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# Currently Linux does not allow this, so this should fail too
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route_test 127.99.2.3 127.99.2.4 200.1.2.3 200.1.2.4 24 "routing using 127/8 (is forbidden)"
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#
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unset expect_failure
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# =====================================================
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# ==== END OF TESTS THAT CURRENTLY EXPECT FAILURE =====
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# =====================================================
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exit ${result}
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