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libbpf: Set NLM_F_EXCL when creating qdisc 

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: 715c5ce454 ("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
This commit is contained in:
Kumar Kartikeya Dwivedi 2021-06-12 08:05:01 +05:30 committed by Daniel Borkmann
parent 4e164f8716
commit bbf29d3a2e
1 changed files with 1 additions and 1 deletions
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tools/lib/bpf/netlink.c
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@ -457,7 +457,7 @@ static int tc_qdisc_modify(struct bpf_tc_hook *hook, int cmd, int flags)
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)