487 lines
14 KiB
Bash
487 lines
14 KiB
Bash
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#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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#
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# Check xfrm policy resolution. Topology:
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#
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# 1.2 1.1 3.1 3.10 2.1 2.2
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# eth1 eth1 veth0 veth0 eth1 eth1
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# ns1 ---- ns3 ----- ns4 ---- ns2
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#
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# ns3 and ns4 are connected via ipsec tunnel.
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# pings from ns1 to ns2 (and vice versa) are supposed to work like this:
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# ns1: ping 10.0.2.2: passes via ipsec tunnel.
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# ns2: ping 10.0.1.2: passes via ipsec tunnel.
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# ns1: ping 10.0.1.253: passes via ipsec tunnel (direct policy)
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# ns2: ping 10.0.2.253: passes via ipsec tunnel (direct policy)
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#
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# ns1: ping 10.0.2.254: does NOT pass via ipsec tunnel (exception)
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# ns2: ping 10.0.1.254: does NOT pass via ipsec tunnel (exception)
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# Kselftest framework requirement - SKIP code is 4.
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ksft_skip=4
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ret=0
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policy_checks_ok=1
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KEY_SHA=0xdeadbeef1234567890abcdefabcdefabcdefabcd
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KEY_AES=0x0123456789abcdef0123456789012345
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SPI1=0x1
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SPI2=0x2
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do_esp_policy() {
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local ns=$1
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local me=$2
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local remote=$3
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local lnet=$4
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local rnet=$5
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# to encrypt packets as they go out (includes forwarded packets that need encapsulation)
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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
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# to fwd decrypted packets after esp processing:
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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
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}
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do_esp() {
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local ns=$1
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local me=$2
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local remote=$3
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local lnet=$4
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local rnet=$5
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local spi_out=$6
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local spi_in=$7
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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
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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
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do_esp_policy $ns $me $remote $lnet $rnet
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}
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# add policies with different netmasks, to make sure kernel carries
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# the policies contained within new netmask over when search tree is
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# re-built.
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# peer netns that are supposed to be encapsulated via esp have addresses
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# in the 10.0.1.0/24 and 10.0.2.0/24 subnets, respectively.
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#
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# Adding a policy for '10.0.1.0/23' will make it necessary to
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# alter the prefix of 10.0.1.0 subnet.
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# In case new prefix overlaps with existing node, the node and all
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# policies it carries need to be merged with the existing one(s).
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#
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# Do that here.
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do_overlap()
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{
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local ns=$1
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# adds new nodes to tree (neither network exists yet in policy database).
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ip -net $ns xfrm policy add src 10.1.0.0/24 dst 10.0.0.0/24 dir fwd priority 200 action block
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# adds a new node in the 10.0.0.0/24 tree (dst node exists).
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ip -net $ns xfrm policy add src 10.2.0.0/24 dst 10.0.0.0/24 dir fwd priority 200 action block
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# adds a 10.2.0.0/23 node, but for different dst.
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ip -net $ns xfrm policy add src 10.2.0.0/23 dst 10.0.1.0/24 dir fwd priority 200 action block
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# dst now overlaps with the 10.0.1.0/24 ESP policy in fwd.
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# kernel must 'promote' existing one (10.0.0.0/24) to 10.0.0.0/23.
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# But 10.0.0.0/23 also includes existing 10.0.1.0/24, so that node
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# also has to be merged too, including source-sorted subtrees.
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# old:
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# 10.0.0.0/24 (node 1 in dst tree of the bin)
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# 10.1.0.0/24 (node in src tree of dst node 1)
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# 10.2.0.0/24 (node in src tree of dst node 1)
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# 10.0.1.0/24 (node 2 in dst tree of the bin)
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# 10.0.2.0/24 (node in src tree of dst node 2)
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# 10.2.0.0/24 (node in src tree of dst node 2)
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#
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# The next 'policy add' adds dst '10.0.0.0/23', which means
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# that dst node 1 and dst node 2 have to be merged including
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# the sub-tree. As no duplicates are allowed, policies in
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# the two '10.0.2.0/24' are also merged.
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#
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# after the 'add', internal search tree should look like this:
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# 10.0.0.0/23 (node in dst tree of bin)
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# 10.0.2.0/24 (node in src tree of dst node)
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# 10.1.0.0/24 (node in src tree of dst node)
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# 10.2.0.0/24 (node in src tree of dst node)
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#
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# 10.0.0.0/24 and 10.0.1.0/24 nodes have been merged as 10.0.0.0/23.
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ip -net $ns xfrm policy add src 10.1.0.0/24 dst 10.0.0.0/23 dir fwd priority 200 action block
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# similar to above: add policies (with partially random address), with shrinking prefixes.
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for p in 29 28 27;do
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for k in $(seq 1 32); do
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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
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done
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done
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}
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do_esp_policy_get_check() {
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local ns=$1
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local lnet=$2
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local rnet=$3
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ip -net $ns xfrm policy get src $lnet dst $rnet dir out > /dev/null
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if [ $? -ne 0 ] && [ $policy_checks_ok -eq 1 ] ;then
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policy_checks_ok=0
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echo "FAIL: ip -net $ns xfrm policy get src $lnet dst $rnet dir out"
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ret=1
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fi
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ip -net $ns xfrm policy get src $rnet dst $lnet dir fwd > /dev/null
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if [ $? -ne 0 ] && [ $policy_checks_ok -eq 1 ] ;then
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policy_checks_ok=0
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echo "FAIL: ip -net $ns xfrm policy get src $rnet dst $lnet dir fwd"
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ret=1
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fi
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}
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do_exception() {
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local ns=$1
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local me=$2
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local remote=$3
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local encryptip=$4
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local plain=$5
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# network $plain passes without tunnel
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ip -net $ns xfrm policy add dst $plain dir out priority 10 action allow
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# direct policy for $encryptip, use tunnel, higher prio takes precedence
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ip -net $ns xfrm policy add dst $encryptip dir out tmpl src $me dst $remote proto esp mode tunnel priority 1 action allow
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}
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# policies that are not supposed to match any packets generated in this test.
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do_dummies4() {
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local ns=$1
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for i in $(seq 10 16);do
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# dummy policy with wildcard src/dst.
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echo netns exec $ns ip xfrm policy add src 0.0.0.0/0 dst 10.$i.99.0/30 dir out action block
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echo netns exec $ns ip xfrm policy add src 10.$i.99.0/30 dst 0.0.0.0/0 dir out action block
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for j in $(seq 32 64);do
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echo netns exec $ns ip xfrm policy add src 10.$i.1.0/30 dst 10.$i.$j.0/30 dir out action block
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# silly, as it encompasses the one above too, but its allowed:
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echo netns exec $ns ip xfrm policy add src 10.$i.1.0/29 dst 10.$i.$j.0/29 dir out action block
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# and yet again, even more broad one.
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echo netns exec $ns ip xfrm policy add src 10.$i.1.0/24 dst 10.$i.$j.0/24 dir out action block
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echo netns exec $ns ip xfrm policy add src 10.$i.$j.0/24 dst 10.$i.1.0/24 dir fwd action block
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done
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done | ip -batch /dev/stdin
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}
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do_dummies6() {
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local ns=$1
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for i in $(seq 10 16);do
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for j in $(seq 32 64);do
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echo netns exec $ns ip xfrm policy add src dead:$i::/64 dst dead:$i:$j::/64 dir out action block
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echo netns exec $ns ip xfrm policy add src dead:$i:$j::/64 dst dead:$i::/24 dir fwd action block
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done
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done | ip -batch /dev/stdin
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}
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check_ipt_policy_count()
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{
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ns=$1
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ip netns exec $ns iptables-save -c |grep policy | ( read c rest
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ip netns exec $ns iptables -Z
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if [ x"$c" = x'[0:0]' ]; then
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exit 0
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elif [ x"$c" = x ]; then
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echo "ERROR: No counters"
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ret=1
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exit 111
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else
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exit 1
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fi
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)
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}
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check_xfrm() {
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# 0: iptables -m policy rule count == 0
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# 1: iptables -m policy rule count != 0
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rval=$1
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ip=$2
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local lret=0
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ip netns exec ns1 ping -q -c 1 10.0.2.$ip > /dev/null
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check_ipt_policy_count ns3
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if [ $? -ne $rval ] ; then
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lret=1
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fi
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check_ipt_policy_count ns4
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if [ $? -ne $rval ] ; then
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lret=1
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fi
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ip netns exec ns2 ping -q -c 1 10.0.1.$ip > /dev/null
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check_ipt_policy_count ns3
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if [ $? -ne $rval ] ; then
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lret=1
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fi
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check_ipt_policy_count ns4
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if [ $? -ne $rval ] ; then
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lret=1
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fi
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return $lret
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}
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check_exceptions()
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{
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logpostfix="$1"
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local lret=0
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# ping to .254 should be excluded from the tunnel (exception is in place).
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check_xfrm 0 254
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if [ $? -ne 0 ]; then
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echo "FAIL: expected ping to .254 to fail ($logpostfix)"
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lret=1
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else
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echo "PASS: ping to .254 bypassed ipsec tunnel ($logpostfix)"
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fi
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# ping to .253 should use use ipsec due to direct policy exception.
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check_xfrm 1 253
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if [ $? -ne 0 ]; then
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echo "FAIL: expected ping to .253 to use ipsec tunnel ($logpostfix)"
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lret=1
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else
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echo "PASS: direct policy matches ($logpostfix)"
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fi
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# ping to .2 should use ipsec.
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check_xfrm 1 2
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if [ $? -ne 0 ]; then
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echo "FAIL: expected ping to .2 to use ipsec tunnel ($logpostfix)"
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lret=1
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else
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echo "PASS: policy matches ($logpostfix)"
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fi
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return $lret
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}
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check_hthresh_repeat()
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{
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local log=$1
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i=0
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for i in $(seq 1 10);do
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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
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ip -net ns1 xfrm policy set hthresh6 0 28 || break
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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
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ip -net ns1 xfrm policy set hthresh6 0 28 || break
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done
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if [ $i -ne 10 ] ;then
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echo "FAIL: $log" 1>&2
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ret=1
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return 1
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fi
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echo "PASS: $log"
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return 0
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}
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# insert non-overlapping policies in a random order and check that
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# all of them can be fetched using the traffic selectors.
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check_random_order()
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{
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local ns=$1
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local log=$2
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for i in $(seq 100); do
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ip -net $ns xfrm policy flush
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for j in $(seq 0 16 255 | sort -R); do
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ip -net $ns xfrm policy add dst $j.0.0.0/24 dir out priority 10 action allow
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done
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for j in $(seq 0 16 255); do
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if ! ip -net $ns xfrm policy get dst $j.0.0.0/24 dir out > /dev/null; then
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echo "FAIL: $log" 1>&2
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return 1
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fi
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done
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done
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for i in $(seq 100); do
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ip -net $ns xfrm policy flush
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for j in $(seq 0 16 255 | sort -R); do
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local addr=$(printf "e000:0000:%02x00::/56" $j)
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ip -net $ns xfrm policy add dst $addr dir out priority 10 action allow
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done
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for j in $(seq 0 16 255); do
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local addr=$(printf "e000:0000:%02x00::/56" $j)
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if ! ip -net $ns xfrm policy get dst $addr dir out > /dev/null; then
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echo "FAIL: $log" 1>&2
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return 1
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fi
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done
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done
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ip -net $ns xfrm policy flush
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echo "PASS: $log"
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return 0
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}
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#check for needed privileges
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if [ "$(id -u)" -ne 0 ];then
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echo "SKIP: Need root privileges"
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exit $ksft_skip
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fi
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ip -Version 2>/dev/null >/dev/null
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if [ $? -ne 0 ];then
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echo "SKIP: Could not run test without the ip tool"
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exit $ksft_skip
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fi
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# needed to check if policy lookup got valid ipsec result
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iptables --version 2>/dev/null >/dev/null
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if [ $? -ne 0 ];then
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echo "SKIP: Could not run test without iptables tool"
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exit $ksft_skip
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fi
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for i in 1 2 3 4; do
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ip netns add ns$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
|