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| author | Jiayuan Chen <jiayuan.chen@linux.dev> | 2026-09-04 15:37:39 +0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2026-09-04 09:57:34 -0700 |
| commit | 5e8c349bc8d790fe031a4332e502f5d4f9878644 (patch) | |
| tree | 25b688e4b1d5b567c68bea8077b9924b1e068030 | |
| parent | 41e6f03658adfa9df68642750b53a046f1abdea9 (diff) | |
| download | linux-5e8c349bc8d790fe031a4332e502f5d4f9878644.tar.gz linux-5e8c349bc8d790fe031a4332e502f5d4f9878644.zip | |
selftests/bpf: Fix flaky bpf_nf test when random NAT port is 0
The bpf_nf test allocs a ct, sets snat and dnat with random addr and
port via bpf_ct_set_nat_info(), then looks the ct up and checks the
reply tuple against what was set.
The port comes from bpf_get_prandom_u32() and can be 0. For
bpf_ct_set_nat_info(), port 0 means "port not specified", so only the
addr is mapped and the kernel keeps the original port. The check then
compares that port with 0 and fails, which shows up as a flaky
"Test for source natting" failure in CI [1][2].
Keep the random port in 1..65535 so it is always specified.
[1] https://github.com/kernel-patches/bpf/actions/runs/33830002889/job/100893868791
[2] https://github.com/kernel-patches/bpf/actions/runs/33829976794/job/100893220999
Fixes: b06b45e82b59 ("selftests/bpf: add tests for bpf_ct_set_nat_info kfunc")
Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Link: https://lore.kernel.org/r/20260904073745.363314-1-jiayuan.chen@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
| -rw-r--r-- | tools/testing/selftests/bpf/progs/test_bpf_nf.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_bpf_nf.c b/tools/testing/selftests/bpf/progs/test_bpf_nf.c index df43649ecb78..eda9b7bbab75 100644 --- a/tools/testing/selftests/bpf/progs/test_bpf_nf.c +++ b/tools/testing/selftests/bpf/progs/test_bpf_nf.c @@ -190,8 +190,8 @@ nf_ct_test(struct nf_conn *(*lookup_fn)(void *, struct bpf_sock_tuple *, u32, ct = alloc_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def, sizeof(opts_def)); if (ct) { - __u16 sport = bpf_get_prandom_u32(); - __u16 dport = bpf_get_prandom_u32(); + __u16 sport = bpf_get_prandom_u32() % 65535 + 1; + __u16 dport = bpf_get_prandom_u32() % 65535 + 1; union nf_inet_addr saddr = {}; union nf_inet_addr daddr = {}; struct nf_conn *ct_ins; @@ -293,8 +293,8 @@ nf_ct_opts_new_test(struct nf_conn *(*lookup_fn)(void *, struct bpf_sock_tuple * ct = alloc_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def, sizeof(opts_def)); if (ct) { - __u16 sport = bpf_get_prandom_u32(); - __u16 dport = bpf_get_prandom_u32(); + __u16 sport = bpf_get_prandom_u32() % 65535 + 1; + __u16 dport = bpf_get_prandom_u32() % 65535 + 1; union nf_inet_addr saddr = {}; union nf_inet_addr daddr = {}; struct nf_conn *ct_ins; |