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3f10543c5b
Commit1cc93c48b5("selftests/net: packetdrill: remove tests for tcp_rcv_*big") removed the test for the reverted commit1d2fbaad7c("tcp: stronger sk_rcvbuf checks") but also the one for commit9ca48d616e("tcp: do not accept packets beyond window"). Restore the test with the necessary adaptation: expect a delayed ACK instead of an immediate one, since tcp_can_ingest() does not fail anymore for the last data packet. Signed-off-by: Simon Baatz <gmbnomis@gmail.com> Link: https://patch.msgid.link/20260301-tcp_rcv_big_endseq-v1-1-86ab7415ab58@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
45 lines
1.3 KiB
Plaintext
45 lines
1.3 KiB
Plaintext
// SPDX-License-Identifier: GPL-2.0
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--mss=1000
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`./defaults.sh`
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0 `nstat -n`
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// Establish a connection.
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+0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
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+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
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+0 setsockopt(3, SOL_SOCKET, SO_RCVBUF, [10000], 4) = 0
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+0 bind(3, ..., ...) = 0
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+0 listen(3, 1) = 0
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+0 < S 0:0(0) win 32792 <mss 1000,nop,wscale 7>
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+0 > S. 0:0(0) ack 1 <mss 1460,nop,wscale 0>
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+.1 < . 1:1(0) ack 1 win 257
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+0 accept(3, ..., ...) = 4
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+0 < P. 1:4001(4000) ack 1 win 257
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+0 > . 1:1(0) ack 4001 win 5000
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// packet in sequence : SKB_DROP_REASON_TCP_INVALID_END_SEQUENCE / LINUX_MIB_BEYOND_WINDOW
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+0 < P. 4001:54001(50000) ack 1 win 257
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+0 > . 1:1(0) ack 4001 win 5000
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// ooo packet. : SKB_DROP_REASON_TCP_INVALID_END_SEQUENCE / LINUX_MIB_BEYOND_WINDOW
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+1 < P. 5001:55001(50000) ack 1 win 257
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+0 > . 1:1(0) ack 4001 win 5000
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// SKB_DROP_REASON_TCP_INVALID_SEQUENCE / LINUX_MIB_BEYOND_WINDOW
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+0 < P. 70001:80001(10000) ack 1 win 257
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+0 > . 1:1(0) ack 4001 win 5000
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+0 read(4, ..., 100000) = 4000
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// If queue is empty, accept a packet even if its end_seq is above wup + rcv_wnd
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+0 < P. 4001:54001(50000) ack 1 win 257
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* > . 1:1(0) ack 54001 win 0
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// Check LINUX_MIB_BEYOND_WINDOW has been incremented 3 times.
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+0 `nstat | grep TcpExtBeyondWindow | grep -q " 3 "`
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