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net: packetmmap: fix only tx timestamp on request
The packetmmap tx ring should only return timestamps if requested via
setsockopt PACKET_TIMESTAMP, as documented. This allows compatibility
with non-timestamp aware user-space code which checks
tp_status == TP_STATUS_AVAILABLE; not expecting additional timestamp
flags to be set in tp_status.
Fixes: b9c32fb271
("packet: if hw/sw ts enabled in rx/tx ring, report which ts we got")
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Signed-off-by: Richard Sanger <rsanger@wand.net.nz>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
aa473d6ceb
commit
171c3b1511
@ -422,7 +422,8 @@ static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec64 *ts,
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ktime_to_timespec64_cond(shhwtstamps->hwtstamp, ts))
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return TP_STATUS_TS_RAW_HARDWARE;
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if (ktime_to_timespec64_cond(skb->tstamp, ts))
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if ((flags & SOF_TIMESTAMPING_SOFTWARE) &&
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ktime_to_timespec64_cond(skb->tstamp, ts))
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return TP_STATUS_TS_SOFTWARE;
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return 0;
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@ -2340,7 +2341,12 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
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skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
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if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
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/* Always timestamp; prefer an existing software timestamp taken
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* closer to the time of capture.
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*/
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ts_status = tpacket_get_timestamp(skb, &ts,
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po->tp_tstamp | SOF_TIMESTAMPING_SOFTWARE);
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if (!ts_status)
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ktime_get_real_ts64(&ts);
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status |= ts_status;
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