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Test DSACK behavior with non contiguous ranges. Without prior fix (tcp: fix tcp_ofo_queue() to avoid including too much DUP SACK range) this would fail with: tcp_dsack_mult.pkt:37: error handling packet: bad value outbound TCP option 5 script packet: 0.100682 . 1:1(0) ack 6001 <nop,nop,sack 1001:3001 7001:8001> actual packet: 0.100679 . 1:1(0) ack 6001 win 1097 <nop,nop,sack 1001:6001 7001:8001> Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: xin.guo <guoxin0309@gmail.com> Link: https://patch.msgid.link/20250626123420.1933835-3-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
46 lines
1.3 KiB
Plaintext
46 lines
1.3 KiB
Plaintext
// SPDX-License-Identifier: GPL-2.0
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// Test various DSACK (RFC 2883) behaviors.
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--mss=1000
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`./defaults.sh`
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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 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,sackOK,nop,nop,nop,wscale 7>
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+0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
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+.1 < . 1:1(0) ack 1 win 1024
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+0 accept(3, ..., ...) = 4
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// First SACK range.
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+0 < P. 1001:2001(1000) ack 1 win 1024
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+0 > . 1:1(0) ack 1 <nop, nop, sack 1001:2001>
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// Check SACK coalescing (contiguous sequence).
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+0 < P. 2001:3001(1000) ack 1 win 1024
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+0 > . 1:1(0) ack 1 <nop,nop,sack 1001:3001>
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// Check we have two SACK ranges for non contiguous sequences.
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+0 < P. 4001:5001(1000) ack 1 win 1024
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+0 > . 1:1(0) ack 1 <nop,nop,sack 4001:5001 1001:3001>
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// Three ranges.
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+0 < P. 7001:8001(1000) ack 1 win 1024
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+0 > . 1:1(0) ack 1 <nop,nop,sack 7001:8001 4001:5001 1001:3001>
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// DSACK (1001:3001) + SACK (6001:7001)
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+0 < P. 1:6001(6000) ack 1 win 1024
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+0 > . 1:1(0) ack 6001 <nop,nop,sack 1001:3001 7001:8001>
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// DSACK (7001:8001)
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+0 < P. 6001:8001(2000) ack 1 win 1024
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+0 > . 1:1(0) ack 8001 <nop,nop,sack 7001:8001>
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// DSACK for an older segment.
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+0 < P. 1:1001(1000) ack 1 win 1024
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+0 > . 1:1(0) ack 8001 <nop,nop,sack 1:1001>
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