From: Martin KaFai Lau <martin.lau@linux.dev>
To: Jason Xing <kerneljasonxing@gmail.com>
Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
pabeni@redhat.com, dsahern@kernel.org,
willemdebruijn.kernel@gmail.com, willemb@google.com,
ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev,
john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me,
haoluo@google.com, jolsa@kernel.org, shuah@kernel.org,
ykolal@fb.com, bpf@vger.kernel.org, netdev@vger.kernel.org,
Jason Xing <kernelxing@tencent.com>
Subject: Re: [PATCH net-next v3 10/14] net-timestamp: add basic support with tskey offset
Date: Wed, 30 Oct 2024 22:52:19 -0700 [thread overview]
Message-ID: <0b4392ce-b10d-4103-b592-2ab7a624cae7@linux.dev> (raw)
In-Reply-To: <CAL+tcoDi86GkJRd8fShGNH8CgdFu3kbfMubWxCLVdo+3O-wnfg@mail.gmail.com>
On 10/30/24 7:41 PM, Jason Xing wrote:
>> All that said, while looking at tcp_tx_timestamp() again, there is always
>> "shinfo->tskey = TCP_SKB_CB(skb)->seq + skb->len - 1;". shinfo->tskey can be
>> used directly as-is by the bpf prog. I think now I am missing why the bpf prog
>> needs the sk_tskey in the sk?
>
> As you said, tcp seqno could be treated as the key, but it leaks the
> information in TCP layer to users. Please see the commit:
I don't think it is a concern for bpf prog running in the kernel. The sockops
bpf prog can already read the sk, the skb (which has seqno), and many others.
The bpf prog is not a print-only logic. Only using bpf prog to do raw data
dumping is not fully utilizing its capability, e.g. data aggregation. The bpf
prog should aggregate the data first which is to calculate the delay here.
next prev parent reply other threads:[~2024-10-31 5:52 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-28 11:05 [PATCH net-next v3 00/14] net-timestamp: bpf extension to equip applications transparently Jason Xing
2024-10-28 11:05 ` [PATCH net-next v3 01/14] net-timestamp: reorganize in skb_tstamp_tx_output() Jason Xing
2024-10-28 11:05 ` [PATCH net-next v3 02/14] net-timestamp: allow two features to work parallelly Jason Xing
2024-10-29 23:00 ` Martin KaFai Lau
2024-10-30 1:23 ` Jason Xing
2024-10-30 1:45 ` Willem de Bruijn
2024-10-30 2:32 ` Jason Xing
2024-10-30 2:47 ` Willem de Bruijn
2024-10-30 3:04 ` Jason Xing
2024-10-30 5:37 ` Martin KaFai Lau
2024-10-30 6:42 ` Jason Xing
2024-10-30 17:15 ` Willem de Bruijn
2024-10-30 23:54 ` Jason Xing
2024-10-31 0:13 ` Jason Xing
2024-10-31 6:27 ` Martin KaFai Lau
2024-10-31 7:04 ` Jason Xing
2024-10-31 12:30 ` Willem de Bruijn
2024-10-31 13:50 ` Jason Xing
2024-10-31 23:26 ` Martin KaFai Lau
2024-11-01 7:47 ` Jason Xing
2024-11-05 1:50 ` Martin KaFai Lau
2024-11-05 3:13 ` Jason Xing
2024-11-01 13:32 ` Willem de Bruijn
2024-11-01 16:08 ` Jason Xing
2024-11-01 16:39 ` Willem de Bruijn
2024-11-05 2:09 ` Martin KaFai Lau
2024-11-05 6:22 ` Jason Xing
2024-11-05 19:22 ` Martin KaFai Lau
2024-11-06 0:17 ` Jason Xing
2024-11-06 1:09 ` Martin KaFai Lau
2024-11-06 2:51 ` Jason Xing
2024-11-07 1:19 ` Martin KaFai Lau
2024-11-07 3:31 ` Jason Xing
2024-11-07 19:05 ` Martin KaFai Lau
2024-11-06 1:11 ` Willem de Bruijn
2024-11-06 2:37 ` Jason Xing
2024-11-05 14:29 ` Willem de Bruijn
2024-11-02 13:43 ` Simon Horman
2024-11-03 0:42 ` Jason Xing
2024-10-28 11:05 ` [PATCH net-next v3 03/14] net-timestamp: open gate for bpf_setsockopt/_getsockopt Jason Xing
2024-10-29 0:59 ` Willem de Bruijn
2024-10-29 1:18 ` Jason Xing
2024-10-30 0:32 ` Martin KaFai Lau
2024-10-30 1:15 ` Jason Xing
2024-10-28 11:05 ` [PATCH net-next v3 04/14] net-timestamp: introduce TS_SCHED_OPT_CB to generate dev xmit timestamp Jason Xing
2024-10-29 0:23 ` kernel test robot
2024-10-29 1:02 ` Willem de Bruijn
2024-10-29 1:30 ` Jason Xing
2024-10-29 1:04 ` kernel test robot
2024-10-28 11:05 ` [PATCH net-next v3 05/14] net-timestamp: introduce TS_SW_OPT_CB to generate driver timestamp Jason Xing
2024-10-28 11:05 ` [PATCH net-next v3 06/14] net-timestamp: introduce TS_ACK_OPT_CB to generate tcp acked timestamp Jason Xing
2024-10-29 1:03 ` Willem de Bruijn
2024-10-29 1:19 ` Jason Xing
2024-10-28 11:05 ` [PATCH net-next v3 07/14] net-timestamp: add a new triggered point to set sk_tsflags_bpf in UDP layer Jason Xing
2024-10-29 1:07 ` Willem de Bruijn
2024-10-29 1:23 ` Jason Xing
2024-10-29 1:33 ` Willem de Bruijn
2024-10-29 3:12 ` Jason Xing
2024-10-29 15:04 ` Willem de Bruijn
2024-10-29 15:44 ` Jason Xing
2024-10-28 11:05 ` [PATCH net-next v3 08/14] net-timestamp: make bpf for tx timestamp work Jason Xing
2024-10-28 11:05 ` [PATCH net-next v3 09/14] net-timestamp: add a common helper to set tskey Jason Xing
2024-10-28 11:05 ` [PATCH net-next v3 10/14] net-timestamp: add basic support with tskey offset Jason Xing
2024-10-29 1:24 ` Willem de Bruijn
2024-10-29 2:41 ` Jason Xing
2024-10-29 15:03 ` Willem de Bruijn
2024-10-29 15:50 ` Jason Xing
2024-10-29 19:45 ` Willem de Bruijn
2024-10-30 3:27 ` Jason Xing
2024-10-30 5:42 ` Martin KaFai Lau
2024-10-30 6:50 ` Jason Xing
2024-10-31 1:17 ` Martin KaFai Lau
2024-10-31 2:41 ` Jason Xing
2024-10-31 3:27 ` Jason Xing
2024-10-31 5:52 ` Martin KaFai Lau [this message]
2024-10-31 6:16 ` Jason Xing
2024-10-31 23:50 ` Martin KaFai Lau
2024-11-01 6:33 ` Jason Xing
2024-10-28 11:05 ` [PATCH net-next v3 11/14] net-timestamp: support OPT_ID for TCP proto Jason Xing
2024-10-28 11:05 ` [PATCH net-next v3 12/14] net-timestamp: add OPT_ID for UDP proto Jason Xing
2024-10-28 11:05 ` [PATCH net-next v3 13/14] net-timestamp: use static key to control bpf extension Jason Xing
2024-10-28 11:05 ` [PATCH net-next v3 14/14] bpf: add simple bpf tests in the tx path for so_timstamping feature Jason Xing
2024-10-29 1:26 ` Willem de Bruijn
2024-10-29 1:33 ` Jason Xing
2024-10-29 1:40 ` Willem de Bruijn
2024-10-29 3:13 ` Jason Xing
2024-10-30 5:57 ` Martin KaFai Lau
2024-10-30 6:54 ` Jason Xing
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