bpf: Allow __sk_buff tstamp in BPF_PROG_TEST_RUN
It's useful for implementing EDT related tests (set tstamp, run the
test, see how the tstamp is changed or observe some other parameter).
Note that bpf_ktime_get_ns() helper is using monotonic clock, so for
the BPF programs that compare tstamp against it, tstamp should be
derived from clock_gettime(CLOCK_MONOTONIC, ...).
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20191015183125.124413-1-sdf@google.com
diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index 1153bbc..0be4497 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -218,10 +218,18 @@ static int convert___skb_to_skb(struct sk_buff *skb, struct __sk_buff *__skb)
if (!range_is_zero(__skb, offsetof(struct __sk_buff, cb) +
FIELD_SIZEOF(struct __sk_buff, cb),
+ offsetof(struct __sk_buff, tstamp)))
+ return -EINVAL;
+
+ /* tstamp is allowed */
+
+ if (!range_is_zero(__skb, offsetof(struct __sk_buff, tstamp) +
+ FIELD_SIZEOF(struct __sk_buff, tstamp),
sizeof(struct __sk_buff)))
return -EINVAL;
skb->priority = __skb->priority;
+ skb->tstamp = __skb->tstamp;
memcpy(&cb->data, __skb->cb, QDISC_CB_PRIV_LEN);
return 0;
@@ -235,6 +243,7 @@ static void convert_skb_to___skb(struct sk_buff *skb, struct __sk_buff *__skb)
return;
__skb->priority = skb->priority;
+ __skb->tstamp = skb->tstamp;
memcpy(__skb->cb, &cb->data, QDISC_CB_PRIV_LEN);
}