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88395c071f
Same as initial tests, import verbatim from github.com/google/packetdrill, aside from: - update `source ./defaults.sh` path to adjust for flat dir - add SPDX headers - remove author statements if any - drop blank lines at EOF Same test process as previous tests. Both with and without debug mode. Recording the steps once: make mrproper vng --build \ --config tools/testing/selftests/net/packetdrill/config \ --config kernel/configs/debug.config vng -v --run . --user root --cpus 4 -- \ make -C tools/testing/selftests TARGETS=net/packetdrill run_tests Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Soham Chakradeo <sohamch@google.com> Link: https://patch.msgid.link/20241217185203.297935-2-sohamch.kernel@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
22 lines
643 B
Plaintext
22 lines
643 B
Plaintext
// SPDX-License-Identifier: GPL-2.0
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// Test ECN: verify that Linux TCP ECN sending code uses ECT0 (not ECT1).
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//
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`./defaults.sh
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sysctl -q net.ipv4.tcp_ecn=1 # fully enabled
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`
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// Initialize connection
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0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 4
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// ECN handshake: send EW flags in SYN packet, E flag in SYN-ACK response
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+.002 ... 0.004 connect(4, ..., ...) = 0
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+0 > SEW 0:0(0) <mss 1460,sackOK,TS val 100 ecr 0,nop,wscale 8>
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+.002 < SE. 0:0(0) ack 1 win 32767 <mss 1000,nop,wscale 6,nop,nop,sackOK>
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+0 > . 1:1(0) ack 1
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// Write 1 MSS.
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+.002 write(4, ..., 1000) = 1000
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// Send 1 MSS with ect0.
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+0 > [ect0] P. 1:1001(1000) ack 1
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