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selftests/bpf: Set gopt opt_class to 0 if get tunnel opt failed 

When fixing the bpf test_tunnel.sh geneve failure. I only fixed the IPv4
part but forgot the IPv6 issue. Similar with the IPv4 fixes 557c223b64
("selftests/bpf: No need to drop the packet when there is no geneve opt"),
when there is no tunnel option and bpf_skb_get_tunnel_opt() returns error,
there is no need to drop the packets and break all geneve rx traffic.
Just set opt_class to 0 and keep returning TC_ACT_OK at the end.

Fixes: 557c223b64 ("selftests/bpf: No need to drop the packet when there is no geneve opt")
Fixes: 933a741e3b ("selftests/bpf: bpf tunnel test.")
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: William Tu <u9012063@gmail.com>
Link: https://lore.kernel.org/bpf/20210309032214.2112438-1-liuhangbin@gmail.com
rM2-mainline
Hangbin Liu 2021-03-09 11:22:14 +08:00 committed by Daniel Borkmann
parent a25f822285
commit 31254dc956
1 changed files with 2 additions and 4 deletions
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6
tools/testing/selftests/bpf/progs/test_tunnel_kern.c
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@ -508,10 +508,8 @@ int _ip6geneve_get_tunnel(struct __sk_buff *skb)
}
ret = bpf_skb_get_tunnel_opt(skb, &gopt, sizeof(gopt));
if (ret < 0) {
ERROR(ret);
return TC_ACT_SHOT;
}
if (ret < 0)
gopt.opt_class = 0;
bpf_trace_printk(fmt, sizeof(fmt),
key.tunnel_id, key.remote_ipv4, gopt.opt_class);