Commit 906893cf authored by Eric Dumazet's avatar Eric Dumazet Committed by Jakub Kicinski
Browse files

selftests/net: packetdrill: add tcp_rcv_toobig.pkt 



Check that TCP receiver behavior after "tcp: stronger sk_rcvbuf checks"

Too fat packet is dropped unless receive queue is empty.

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Reviewed-by: default avatarKuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20250711114006.480026-9-edumazet@google.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 1d2fbaad

tools/testing/selftests/net/packetdrill/tcp_rcv_toobig.pkt

0 → 100644
+33 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0



--mss=1000



`./defaults.sh`



    0 `nstat -n`



// Establish a connection.

   +0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3

   +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0

   +0 setsockopt(3, SOL_SOCKET, SO_RCVBUF, [20000], 4) = 0

   +0 bind(3, ..., ...) = 0

   +0 listen(3, 1) = 0



   +0 < S 0:0(0) win 32792 <mss 1000,nop,wscale 7>

   +0 > S. 0:0(0) ack 1 win 18980 <mss 1460,nop,wscale 0>

  +.1 < . 1:1(0) ack 1 win 257



   +0 accept(3, ..., ...) = 4



   +0 < P. 1:20001(20000) ack 1 win 257

 +.04 > .  1:1(0) ack 20001 win 18000



   +0 setsockopt(4, SOL_SOCKET, SO_RCVBUF, [12000], 4) = 0

   +0 < P. 20001:80001(60000) ack 1 win 257

   +0 > .  1:1(0) ack 20001 win 18000



   +0 read(4, ..., 20000) = 20000

// A too big packet is accepted if the receive queue is empty

   +0 < P. 20001:80001(60000) ack 1 win 257

   +0 > .  1:1(0) ack 80001 win 0