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906893cf2c
Check that TCP receiver behavior after "tcp: stronger sk_rcvbuf checks" Too fat packet is dropped unless receive queue is empty. Signed-off-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com> Link: https://patch.msgid.link/20250711114006.480026-9-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
34 lines
896 B
Plaintext
34 lines
896 B
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, [20000], 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 win 18980 <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. 1:20001(20000) ack 1 win 257
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+.04 > . 1:1(0) ack 20001 win 18000
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+0 setsockopt(4, SOL_SOCKET, SO_RCVBUF, [12000], 4) = 0
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+0 < P. 20001:80001(60000) ack 1 win 257
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+0 > . 1:1(0) ack 20001 win 18000
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+0 read(4, ..., 20000) = 20000
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// A too big packet is accepted if the receive queue is empty
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+0 < P. 20001:80001(60000) ack 1 win 257
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+0 > . 1:1(0) ack 80001 win 0
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