From: Kumar Kartikeya Dwivedi memxor@gmail.com
mainline inclusion from mainline-5.14-rc1 commit bbf29d3a2e49e482d5267311798aec42f00e88f3 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I5EUVD CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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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 (cherry picked from commit bbf29d3a2e49e482d5267311798aec42f00e88f3) Signed-off-by: Wang Yufen wangyufen@huawei.com --- tools/lib/bpf/netlink.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/lib/bpf/netlink.c b/tools/lib/bpf/netlink.c index efbb50ad59d8..cf9381f03b16 100644 --- a/tools/lib/bpf/netlink.c +++ b/tools/lib/bpf/netlink.c @@ -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)