From: Anubhav Singh Date: Thu, 30 Oct 2025 06:04:36 +0000 (+0000) Subject: selftests/net: use destination options instead of hop-by-hop X-Git-Tag: v6.17.8~89 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c972bdc060650ab02e9fb75a1295b75eadc63978;p=thirdparty%2Fkernel%2Fstable.git selftests/net: use destination options instead of hop-by-hop [ Upstream commit f8e8486702abb05b8c734093aab1606af0eac068 ] The GRO self-test, gro.c, currently constructs IPv6 packets containing a Hop-by-Hop Options header (IPPROTO_HOPOPTS) to ensure the GRO path correctly handles IPv6 extension headers. However, network elements may be configured to drop packets with the Hop-by-Hop Options header (HBH). This causes the self-test to fail in environments where such network elements are present. To improve the robustness and reliability of this test in diverse network environments, switch from using IPPROTO_HOPOPTS to IPPROTO_DSTOPTS (Destination Options). The Destination Options header is less likely to be dropped by intermediate routers and still serves the core purpose of the test: validating GRO's handling of an IPv6 extension header. This change ensures the test can execute successfully without being incorrectly failed by network policies outside the kernel's control. Fixes: 7d1575014a63 ("selftests/net: GRO coalesce test") Reviewed-by: Willem de Bruijn Signed-off-by: Anubhav Singh Link: https://patch.msgid.link/20251030060436.1556664-1-anubhavsinggh@google.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- diff --git a/tools/testing/selftests/net/gro.c b/tools/testing/selftests/net/gro.c index 209ec60052f5b..48755b8475a4b 100644 --- a/tools/testing/selftests/net/gro.c +++ b/tools/testing/selftests/net/gro.c @@ -734,11 +734,11 @@ static void send_ipv6_exthdr(int fd, struct sockaddr_ll *daddr, char *ext_data1, static char exthdr_pck[sizeof(buf) + MIN_EXTHDR_SIZE]; create_packet(buf, 0, 0, PAYLOAD_LEN, 0); - add_ipv6_exthdr(buf, exthdr_pck, IPPROTO_HOPOPTS, ext_data1); + add_ipv6_exthdr(buf, exthdr_pck, IPPROTO_DSTOPTS, ext_data1); write_packet(fd, exthdr_pck, total_hdr_len + PAYLOAD_LEN + MIN_EXTHDR_SIZE, daddr); create_packet(buf, PAYLOAD_LEN * 1, 0, PAYLOAD_LEN, 0); - add_ipv6_exthdr(buf, exthdr_pck, IPPROTO_HOPOPTS, ext_data2); + add_ipv6_exthdr(buf, exthdr_pck, IPPROTO_DSTOPTS, ext_data2); write_packet(fd, exthdr_pck, total_hdr_len + PAYLOAD_LEN + MIN_EXTHDR_SIZE, daddr); }