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selftests/net: packetdrill: add tcp_ooo-before-and-after-accept.pkt

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Test how new passive flows react to ooo incoming packets.

Their sk_rcvbuf can increase only after accept().

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20250707213900.1543248-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet
2025-07-07 21:39:00 +00:00
committed by Jakub Kicinski
parent 1a03edeb84
commit b939c074ef
1 changed files with 53 additions and 0 deletions
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53
tools/testing/selftests/net/packetdrill/tcp_ooo-before-and-after-accept.pkt Normal file
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// SPDX-License-Identifier: GPL-2.0
--mss=1000
`./defaults.sh
sysctl -q net.ipv4.tcp_rmem="4096 131072 $((32*1024*1024))"`
// Test that a not-yet-accepted socket does not change
// its initial sk_rcvbuf (tcp_rmem[1]) when receiving ooo packets.
+0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
+0 bind(3, ..., ...) = 0
+0 listen(3, 1) = 0
+0 < S 0:0(0) win 65535 <mss 1000,nop,nop,sackOK,nop,wscale 7>
+0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 10>
+.1 < . 1:1(0) ack 1 win 257
+0 < . 2001:41001(39000) ack 1 win 257
+0 > . 1:1(0) ack 1 <nop,nop,sack 2001:41001>
+0 < . 41001:101001(60000) ack 1 win 257
+0 > . 1:1(0) ack 1 <nop,nop,sack 2001:101001>
+0 < . 1:1001(1000) ack 1 win 257
+0 > . 1:1(0) ack 1001 <nop,nop,sack 2001:101001>
+0 < . 1001:2001(1000) ack 1 win 257
+0 > . 1:1(0) ack 101001
+0 accept(3, ..., ...) = 4
+0 %{ assert SK_MEMINFO_RCVBUF == 131072, SK_MEMINFO_RCVBUF }%
+0 close(4) = 0
+0 close(3) = 0
// Test that ooo packets for accepted sockets do increase sk_rcvbuf
+0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
+0 bind(3, ..., ...) = 0
+0 listen(3, 1) = 0
+0 < S 0:0(0) win 65535 <mss 1000,nop,nop,sackOK,nop,wscale 7>
+0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 10>
+.1 < . 1:1(0) ack 1 win 257
+0 accept(3, ..., ...) = 4
+0 < . 2001:41001(39000) ack 1 win 257
+0 > . 1:1(0) ack 1 <nop,nop,sack 2001:41001>
+0 < . 41001:101001(60000) ack 1 win 257
+0 > . 1:1(0) ack 1 <nop,nop,sack 2001:101001>
+0 %{ assert SK_MEMINFO_RCVBUF > 131072, SK_MEMINFO_RCVBUF }%