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Miller" , David Ahern , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Ido Schimmel , Hangbin Liu , Thomas Haller Subject: [PATCHv6 net-next 1/2] ipv6: do not match device when remove source route Date: Wed, 16 Aug 2023 14:07:23 +0800 Message-Id: <20230816060724.1398842-2-liuhangbin@gmail.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20230816060724.1398842-1-liuhangbin@gmail.com> References: <20230816060724.1398842-1-liuhangbin@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org After deleting an IPv6 address on an interface and cleaning up the related preferred source entries, it is important to ensure that all routes associated with the deleted address are properly cleared. The current implementation of rt6_remove_prefsrc() only checks the preferred source addresses bound to the current device. However, there may be routes that are bound to other devices but still utilize the same preferred source address. To address this issue, it is necessary to also delete entries that are bound to other interfaces but share the same source address with the current device. Failure to delete these entries would leave routes that are bound to the deleted address unclear. Here is an example reproducer (I have omitted unrelated routes): + ip link add dummy1 type dummy + ip link add dummy2 type dummy + ip link set dummy1 up + ip link set dummy2 up + ip addr add 1:2:3:4::5/64 dev dummy1 + ip route add 7:7:7:0::1 dev dummy1 src 1:2:3:4::5 + ip route add 7:7:7:0::2 dev dummy2 src 1:2:3:4::5 + ip -6 route show 1:2:3:4::/64 dev dummy1 proto kernel metric 256 pref medium 7:7:7::1 dev dummy1 src 1:2:3:4::5 metric 1024 pref medium 7:7:7::2 dev dummy2 src 1:2:3:4::5 metric 1024 pref medium + ip addr del 1:2:3:4::5/64 dev dummy1 + ip -6 route show 7:7:7::1 dev dummy1 metric 1024 pref medium 7:7:7::2 dev dummy2 src 1:2:3:4::5 metric 1024 pref medium As Ido reminds, in IPv6, the preferred source address is looked up in the same VRF as the first nexthop device, which is different with IPv4. So, while removing the device checking, we also need to add an ipv6_chk_addr() check to make sure the address does not exist on the other devices of the rt nexthop device's VRF. After fix: + ip addr del 1:2:3:4::5/64 dev dummy1 + ip -6 route show 7:7:7::1 dev dummy1 metric 1024 pref medium 7:7:7::2 dev dummy2 metric 1024 pref medium Reported-by: Thomas Haller Closes: https://bugzilla.redhat.com/show_bug.cgi?id=2170513 Fixes: c3968a857a6b ("ipv6: RTA_PREFSRC support for ipv6 route source address selection") Signed-off-by: Hangbin Liu Reviewed-by: Ido Schimmel --- v6: - Add back the "!rt->nh" checking as Ido said this should be fixed in another patch. - Remove the table id checking as the preferred source address is looked up in the same VRF as the first nexthop device in IPv6. not VRF table like IPv4. - Move the fib tests to a separate patch. v5: Move the addr check back to fib6_remove_prefsrc. v4: check if the prefsrc address still exists on other device v3: remove rt nh checking. update the ipv6_del_addr test descriptions v2: checking table id and update fib_test.sh --- net/ipv6/route.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 10751df16dab..3e1c76c7bdd3 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -4582,21 +4582,19 @@ struct fib6_info *addrconf_f6i_alloc(struct net *net, /* remove deleted ip from prefsrc entries */ struct arg_dev_net_ip { - struct net_device *dev; struct net *net; struct in6_addr *addr; }; static int fib6_remove_prefsrc(struct fib6_info *rt, void *arg) { - struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; struct net *net = ((struct arg_dev_net_ip *)arg)->net; struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; if (!rt->nh && - ((void *)rt->fib6_nh->fib_nh_dev == dev || !dev) && rt != net->ipv6.fib6_null_entry && - ipv6_addr_equal(addr, &rt->fib6_prefsrc.addr)) { + ipv6_addr_equal(addr, &rt->fib6_prefsrc.addr) && + !ipv6_chk_addr(net, addr, rt->fib6_nh->fib_nh_dev, 0)) { spin_lock_bh(&rt6_exception_lock); /* remove prefsrc entry */ rt->fib6_prefsrc.plen = 0; @@ -4609,7 +4607,6 @@ void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) { struct net *net = dev_net(ifp->idev->dev); struct arg_dev_net_ip adni = { - .dev = ifp->idev->dev, .net = net, .addr = &ifp->addr, }; From patchwork Wed Aug 16 06:07:24 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hangbin Liu X-Patchwork-Id: 13354590 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 61DF6C8CA for ; 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Tue, 15 Aug 2023 23:07:35 -0700 (PDT) From: Hangbin Liu To: netdev@vger.kernel.org Cc: "David S . Miller" , David Ahern , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Ido Schimmel , Hangbin Liu Subject: [PATCHv6 net-next 2/2] selftests: fib_test: add a test case for IPv6 source address delete Date: Wed, 16 Aug 2023 14:07:24 +0800 Message-Id: <20230816060724.1398842-3-liuhangbin@gmail.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20230816060724.1398842-1-liuhangbin@gmail.com> References: <20230816060724.1398842-1-liuhangbin@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Add a test case for IPv6 source address delete. As David suggested, add tests: - Single device using src address - Two devices with the same source address - VRF with single device using src address - VRF with two devices using src address As Ido points out, in IPv6, the preferred source address is looked up in the same VRF as the first nexthop device. This will give us similar results to IPv4 if the route is installed in the same VRF as the nexthop device, but not when the nexthop device is enslaved to a different VRF. So add tests: - src address and nexthop dev in same VR - src address and nexthop device in different VRF The link local address delete logic is different from the global address. It should only affect the associate device it bonds to. Add tests cases for link local address testing. The table 0 and same FIB info tests are copied from IPv4 tests. Here is the test result: IPv6 delete address route tests Single device using src address TEST: Prefsrc removed when src address removed on other device [ OK ] Two devices with the same source address TEST: Prefsrc not removed when src address exist on other device [ OK ] VRF with single device using src address TEST: Prefsrc removed when src address removed on other device [ OK ] VRF with two devices using src address TEST: Prefsrc not removed when src address exist on other device [ OK ] src address and nexthop dev in same VRF TEST: Prefsrc removed from VRF when source address deleted [ OK ] TEST: Prefsrc in default VRF not removed [ OK ] TEST: Prefsrc not removed from VRF when source address exist [ OK ] TEST: Prefsrc in default VRF removed [ OK ] src address and nexthop device in different VRF TEST: Prefsrc not removed from VRF when nexthop dev in diff VRF [ OK ] TEST: Prefsrc not removed in default VRF [ OK ] TEST: Prefsrc removed from VRF when nexthop dev in diff VRF [ OK ] TEST: Prefsrc removed in default VRF [ OK ] Same FIB info with different table ID TEST: Prefsrc removed from VRF when source address deleted [ OK ] TEST: Prefsrc in default VRF not removed [ OK ] TEST: Prefsrc not removed from VRF when source address exist [ OK ] TEST: Prefsrc in default VRF removed [ OK ] Table ID 0 TEST: Prefsrc removed from default VRF when source address deleted [ OK ] Link local source route TEST: Prefsrc not removed when delete ll addr from other dev [ OK ] TEST: Prefsrc removed when delete ll addr [ OK ] TEST: Prefsrc not removed when delete ll addr from other dev [ OK ] TEST: Prefsrc removed even ll addr still exist on other dev [ OK ] Tests passed: 21 Tests failed: 0 Suggested-by: Ido Schimmel Suggested-by: David Ahern Signed-off-by: Hangbin Liu --- v7: add more tests as Ido and David suggested. Remove the IPv4 part as I want to focus on the IPv6 fixes. --- tools/testing/selftests/net/fib_tests.sh | 163 ++++++++++++++++++++++- 1 file changed, 162 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/net/fib_tests.sh b/tools/testing/selftests/net/fib_tests.sh index 35d89dfa6f11..0aa17b2ac8e1 100755 --- a/tools/testing/selftests/net/fib_tests.sh +++ b/tools/testing/selftests/net/fib_tests.sh @@ -9,7 +9,7 @@ ret=0 ksft_skip=4 # all tests in this script. Can be overridden with -t option -TESTS="unregister down carrier nexthop suppress ipv6_notify ipv4_notify ipv6_rt ipv4_rt ipv6_addr_metric ipv4_addr_metric ipv6_route_metrics ipv4_route_metrics ipv4_route_v6_gw rp_filter ipv4_del_addr ipv4_mangle ipv6_mangle ipv4_bcast_neigh" +TESTS="unregister down carrier nexthop suppress ipv6_notify ipv4_notify ipv6_rt ipv4_rt ipv6_addr_metric ipv4_addr_metric ipv6_route_metrics ipv4_route_metrics ipv4_route_v6_gw rp_filter ipv4_del_addr ipv6_del_addr ipv4_mangle ipv6_mangle ipv4_bcast_neigh" VERBOSE=0 PAUSE_ON_FAIL=no @@ -1869,6 +1869,166 @@ ipv4_del_addr_test() cleanup } +ipv6_del_addr_test() +{ + echo + echo "IPv6 delete address route tests" + + setup + + set -e + for i in $(seq 6); do + $IP li add dummy${i} up type dummy + done + + $IP li add red up type vrf table 1111 + $IP ro add vrf red unreachable default + for i in $(seq 4 6); do + $IP li set dummy${i} vrf red + done + + $IP addr add dev dummy1 fe80::1/128 + $IP addr add dev dummy1 2001:db8:101::1/64 + $IP addr add dev dummy1 2001:db8:101::10/64 + $IP addr add dev dummy1 2001:db8:101::11/64 + $IP addr add dev dummy1 2001:db8:101::12/64 + $IP addr add dev dummy1 2001:db8:101::13/64 + $IP addr add dev dummy1 2001:db8:101::14/64 + $IP addr add dev dummy1 2001:db8:101::15/64 + $IP addr add dev dummy2 fe80::1/128 + $IP addr add dev dummy2 2001:db8:101::1/64 + $IP addr add dev dummy2 2001:db8:101::11/64 + $IP addr add dev dummy3 fe80::1/128 + + $IP addr add dev dummy4 2001:db8:101::1/64 + $IP addr add dev dummy4 2001:db8:101::10/64 + $IP addr add dev dummy4 2001:db8:101::11/64 + $IP addr add dev dummy4 2001:db8:101::12/64 + $IP addr add dev dummy4 2001:db8:101::13/64 + $IP addr add dev dummy4 2001:db8:101::14/64 + $IP addr add dev dummy5 2001:db8:101::1/64 + $IP addr add dev dummy5 2001:db8:101::11/64 + + # Single device using src address + $IP route add 2001:db8:110::/64 dev dummy3 src 2001:db8:101::10 + # Two devices with the same source address + $IP route add 2001:db8:111::/64 dev dummy3 src 2001:db8:101::11 + # VRF with single device using src address + $IP route add vrf red 2001:db8:110::/64 dev dummy6 src 2001:db8:101::10 + # VRF with two devices using src address + $IP route add vrf red 2001:db8:111::/64 dev dummy6 src 2001:db8:101::11 + # src address and nexthop dev in same VRF + $IP route add 2001:db8:112::/64 dev dummy3 src 2001:db8:101::12 + $IP route add vrf red 2001:db8:112::/64 dev dummy6 src 2001:db8:101::12 + # src address and nexthop device in different VRF + $IP route add 2001:db8:113::/64 dev lo src 2001:db8:101::13 + $IP route add vrf red 2001:db8:113::/64 dev lo src 2001:db8:101::13 + # Same FIB info with different table ID + $IP route add 2001:db8:114::/64 via 2001:db8:101::2 src 2001:db8:101::14 + $IP route add vrf red 2001:db8:114::/64 via 2001:db8:101::2 src 2001:db8:101::14 + # table ID 0 + $IP route add table 0 2001:db8:115::/64 via 2001:db8:101::2 src 2001:db8:101::15 + # Link local source route + $IP route add 2001:db8:116::/64 dev dummy2 src fe80::1 + $IP route add 2001:db8:117::/64 dev dummy3 src fe80::1 + set +e + + echo " Single device using src address" + + $IP addr del dev dummy1 2001:db8:101::10/64 + $IP -6 route show | grep -q "src 2001:db8:101::10 " + log_test $? 1 "Prefsrc removed when src address removed on other device" + + echo " Two devices with the same source address" + + $IP addr del dev dummy1 2001:db8:101::11/64 + $IP -6 route show | grep -q "src 2001:db8:101::11 " + log_test $? 0 "Prefsrc not removed when src address exist on other device" + + echo " VRF with single device using src address" + + $IP addr del dev dummy4 2001:db8:101::10/64 + $IP -6 route show vrf red | grep -q "src 2001:db8:101::10 " + log_test $? 1 "Prefsrc removed when src address removed on other device" + + echo " VRF with two devices using src address" + + $IP addr del dev dummy4 2001:db8:101::11/64 + $IP -6 route show vrf red | grep -q "src 2001:db8:101::11 " + log_test $? 0 "Prefsrc not removed when src address exist on other device" + + echo " src address and nexthop dev in same VRF" + + $IP addr del dev dummy4 2001:db8:101::12/64 + $IP -6 route show vrf red | grep -q "src 2001:db8:101::12 " + log_test $? 1 "Prefsrc removed from VRF when source address deleted" + $IP -6 route show | grep -q " src 2001:db8:101::12 " + log_test $? 0 "Prefsrc in default VRF not removed" + + $IP addr add dev dummy4 2001:db8:101::12/64 + $IP route replace vrf red 2001:db8:112::/64 dev dummy6 src 2001:db8:101::12 + $IP addr del dev dummy1 2001:db8:101::12/64 + $IP -6 route show vrf red | grep -q "src 2001:db8:101::12 " + log_test $? 0 "Prefsrc not removed from VRF when source address exist" + $IP -6 route show | grep -q " src 2001:db8:101::12 " + log_test $? 1 "Prefsrc in default VRF removed" + + echo " src address and nexthop device in different VRF" + + $IP addr del dev dummy4 2001:db8:101::13/64 + $IP -6 route show vrf red | grep -q "src 2001:db8:101::13 " + log_test $? 0 "Prefsrc not removed from VRF when nexthop dev in diff VRF" + $IP -6 route show | grep -q " src 2001:db8:101::13 " + log_test $? 0 "Prefsrc not removed in default VRF" + + $IP addr add dev dummy4 2001:db8:101::13/64 + $IP addr del dev dummy1 2001:db8:101::13/64 + $IP -6 route show vrf red | grep -q "src 2001:db8:101::13 " + log_test $? 1 "Prefsrc removed from VRF when nexthop dev in diff VRF" + $IP -6 route show | grep -q " src 2001:db8:101::13 " + log_test $? 1 "Prefsrc removed in default VRF" + + echo " Same FIB info with different table ID" + + $IP addr del dev dummy4 2001:db8:101::14/64 + $IP -6 route show vrf red | grep -q "src 2001:db8:101::14 " + log_test $? 1 "Prefsrc removed from VRF when source address deleted" + $IP -6 route show | grep -q " src 2001:db8:101::14 " + log_test $? 0 "Prefsrc in default VRF not removed" + + $IP addr add dev dummy4 2001:db8:101::14/64 + $IP route replace vrf red 2001:db8:114::/64 via 2001:db8:101::2 src 2001:db8:101::14 + $IP addr del dev dummy1 2001:db8:101::14/64 + $IP -6 route show vrf red | grep -q "src 2001:db8:101::14 " + log_test $? 0 "Prefsrc not removed from VRF when source address exist" + $IP -6 route show | grep -q " src 2001:db8:101::14 " + log_test $? 1 "Prefsrc in default VRF removed" + + echo " Table ID 0" + + $IP addr del dev dummy1 2001:db8:101::15/64 + $IP -6 route show | grep -q "src 2001:db8:101::15" + log_test $? 1 "Prefsrc removed from default VRF when source address deleted" + + echo " Link local source route" + $IP addr del dev dummy1 fe80::1/128 + $IP -6 route show | grep -q "2001:db8:116::/64 dev dummy2 src fe80::1" + log_test $? 0 "Prefsrc not removed when delete ll addr from other dev" + $IP addr del dev dummy2 fe80::1/128 + $IP -6 route show | grep -q "2001:db8:116::/64 dev dummy2 src fe80::1" + log_test $? 1 "Prefsrc removed when delete ll addr" + $IP -6 route show | grep -q "2001:db8:117::/64 dev dummy3 src fe80::1" + log_test $? 0 "Prefsrc not removed when delete ll addr from other dev" + $IP addr add dev dummy1 fe80::1/128 + $IP addr del dev dummy3 fe80::1/128 + $IP -6 route show | grep -q "2001:db8:117::/64 dev dummy3 src fe80::1" + log_test $? 1 "Prefsrc removed even ll addr still exist on other dev" + + for i in $(seq 6); do + $IP li del dummy${i} + done + cleanup +} ipv4_route_v6_gw_test() { @@ -2211,6 +2371,7 @@ do ipv6_addr_metric) ipv6_addr_metric_test;; ipv4_addr_metric) ipv4_addr_metric_test;; ipv4_del_addr) ipv4_del_addr_test;; + ipv6_del_addr) ipv6_del_addr_test;; ipv6_route_metrics) ipv6_route_metrics_test;; ipv4_route_metrics) ipv4_route_metrics_test;; ipv4_route_v6_gw) ipv4_route_v6_gw_test;;