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

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