This got lost during the refactoring across versions. We always use
NLM_F_EXCL when creating some TC object, so reflect what the function
says and set the flag.
Fixes:
715c5ce454a6 ("libbpf: Add low level TC-BPF management API")
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20210612023502.1283837-3-memxor@gmail.com
static int tc_qdisc_create_excl(struct bpf_tc_hook *hook)
{
- return tc_qdisc_modify(hook, RTM_NEWQDISC, NLM_F_CREATE);
+ return tc_qdisc_modify(hook, RTM_NEWQDISC, NLM_F_CREATE | NLM_F_EXCL);
}
static int tc_qdisc_delete(struct bpf_tc_hook *hook)