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[2a01:cb05:8d65:2b00:3ebe:8a25:7dfb:a413]) by smtp.gmail.com with ESMTPSA id t7-20020a5d4607000000b0030647449730sm7533168wrq.74.2023.05.31.11.11.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 31 May 2023 11:11:42 -0700 (PDT) Date: Wed, 31 May 2023 20:11:41 +0200 From: Guillaume Nault To: Mirsad Todorovac Cc: netdev@vger.kernel.org, "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Shuah Khan , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: Re: POSSIBLE BUG: selftests/net/fcnal-test.sh: [FAIL] in vrf "bind - ns-B IPv6 LLA" test Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, May 24, 2023 at 02:17:09PM +0200, Mirsad Todorovac wrote: > Hi, Hi Mirsad, > The very recent 6.4-rc3 kernel build with AlmaLinux 8.7 on LENOVO 10TX000VCR > desktop box fails one test: > > [root@host net]# ./fcnal-test.sh > [...] > TEST: ping out, vrf device+address bind - ns-B loopback IPv6 [ OK ] > TEST: ping out, vrf device+address bind - ns-B IPv6 LLA [FAIL] > TEST: ping in - ns-A IPv6 [ OK ] > [...] > Tests passed: 887 > Tests failed: 1 > [root@host net]# This test also fails on -net. The problem is specific to ping sockets (same test passes with raw sockets). I believe this test has always failed since fcnal-test.sh started using net.ipv4.ping_group_range (commit e71b7f1f44d3 ("selftests: add ping test with ping_group_range tuned")). The executed command is: ip netns exec ns-A ip vrf exec red /usr/bin/ping6 -c1 -w1 -I 2001:db8:3::1 fe80::a846:b5ff:fe4c:da4e%eth1 So ping6 is executed inside VRF 'red' and sets .sin6_scope_id to 'eth1' (which is a slave device of VRF 'red'). Therefore, we have sk->sk_bound_dev_if == 'red' and .sin6_scope_id == 'eth1'. This fails because ping_v6_sendmsg() expects them to be equal: static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) { ... if (__ipv6_addr_needs_scope_id(ipv6_addr_type(daddr))) oif = u->sin6_scope_id; ... if ((__ipv6_addr_needs_scope_id(addr_type) && !oif) || (addr_type & IPV6_ADDR_MAPPED) || (oif && sk->sk_bound_dev_if && oif != sk->sk_bound_dev_if)) <-- oif='eth1', but ->sk_bound_dev_if='red' return -EINVAL; ... } I believe this condition should be relaxed to allow the case where ->sk_bound_dev_if is oif's master device (and maybe there are other VRF cases to also consider).