[RFC PATCH bpf-next 9/9] selftests/bpf: fib_lookup: Add IPv6 link-local tests
From: Ido Schimmel <idosch@nvidia.com>
Date: 2026-02-26 08:02:07
Also in:
bpf
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [selftests] (test runners & infrastructure), kernel selftest framework, the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Shuah Khan, Shuah Khan, Linus Torvalds
Add tests that verify that bpf_fib_lookup() is able to resolve the destination MAC for an IPv6 link-local address when specifying the BPF_FIB_LOOKUP_OUTPUT flag. Output without "bpf: fib_lookup: Allow output lookups for IPv6 link-local addresses": # ./test_progs -a fib_lookup [...] Testing IPv6 output route, link-local, via first device set_lookup_params:PASS:inet_pton(IPV6_IFACE_ADDR) 0 nsec test_fib_lookup:PASS:bpf_prog_test_run_opts 0 nsec test_fib_lookup:FAIL:fib_lookup_ret unexpected fib_lookup_ret: actual 4 != expected 0 [...] Testing IPv6 output route, link-local, via second device set_lookup_params:PASS:inet_pton(IPV6_IFACE_ADDR) 0 nsec test_fib_lookup:PASS:bpf_prog_test_run_opts 0 nsec test_fib_lookup:FAIL:fib_lookup_ret unexpected fib_lookup_ret: actual 4 != expected 0 [...] #119 fib_lookup:FAIL Summary: 0/0 PASSED, 0 SKIPPED, 1 FAILED Output with "bpf: fib_lookup: Allow output lookups for IPv6 link-local addresses": # ./test_progs -a fib_lookup #119 fib_lookup:OK Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED Reviewed-by: Petr Machata <petrm@nvidia.com> Signed-off-by: Ido Schimmel <idosch@nvidia.com> --- .../testing/selftests/bpf/prog_tests/fib_lookup.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/tools/testing/selftests/bpf/prog_tests/fib_lookup.c b/tools/testing/selftests/bpf/prog_tests/fib_lookup.c
index 9e933daf56d7..3dca6fde249b 100644
--- a/tools/testing/selftests/bpf/prog_tests/fib_lookup.c
+++ b/tools/testing/selftests/bpf/prog_tests/fib_lookup.c@@ -47,6 +47,8 @@ #define IPV4_OUTPUT_DST "192.0.2.1" #define IPV6_OUTPUT_NET "2001:db8:1::" #define IPV6_OUTPUT_DST "2001:db8:1::1" +#define IPV6_LL_ADDR "fe80::1" +#define IPV6_LL_DST "fe80::2" struct fib_lookup_test { const char *desc;
@@ -207,6 +209,14 @@ static const struct fib_lookup_test tests[] = { .expected_ret = BPF_FIB_LKUP_RET_NOT_FWDED, .lookup_flags = BPF_FIB_LOOKUP_OUTPUT | BPF_FIB_LOOKUP_SKIP_NEIGH, .ifindex = IFINDEX_VETH2, }, + { .desc = "IPv6 output route, link-local, via first device", + .daddr = IPV6_LL_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS, + .lookup_flags = BPF_FIB_LOOKUP_OUTPUT, .dmac = DMAC_INIT, + .ifindex = IFINDEX_VETH1, .expected_ifindex = IFINDEX_VETH1, }, + { .desc = "IPv6 output route, link-local, via second device", + .daddr = IPV6_LL_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS, + .lookup_flags = BPF_FIB_LOOKUP_OUTPUT, .dmac = DMAC_INIT2, + .ifindex = IFINDEX_VETH2, .expected_ifindex = IFINDEX_VETH2, }, }; static int setup_netns(void)
@@ -289,6 +299,11 @@ static int setup_netns(void) SYS(fail, "ip neigh add %s dev veth1 lladdr %s nud perm", IPV6_OUTPUT_DST, DMAC); SYS(fail, "ip neigh add %s dev veth2 lladdr %s nud perm", IPV6_OUTPUT_DST, DMAC2); + SYS(fail, "ip addr add %s/64 dev veth1 nodad", IPV6_LL_ADDR); + SYS(fail, "ip addr add %s/64 dev veth2 nodad", IPV6_LL_ADDR); + SYS(fail, "ip neigh add %s dev veth1 lladdr %s nud perm", IPV6_LL_DST, DMAC); + SYS(fail, "ip neigh add %s dev veth2 lladdr %s nud perm", IPV6_LL_DST, DMAC2); + return 0; fail: return -1;
--
2.53.0