Commit b939c074 authored by Eric Dumazet's avatar Eric Dumazet Committed by Jakub Kicinski
Browse files

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



Test how new passive flows react to ooo incoming packets.

Their sk_rcvbuf can increase only after accept().

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20250707213900.1543248-3-edumazet@google.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 1a03edeb

tools/testing/selftests/net/packetdrill/tcp_ooo-before-and-after-accept.pkt

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+53 −0
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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 }%