NetBSD Problem Report #59346

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Date: Wed, 23 Apr 2025 15:35:20 +0000 (UTC)
From: andrew.cagney@gmail.com
Reply-To: andrew.cagney@gmail.com
To: gnats-bugs@NetBSD.org
Subject: racoon's established IPsec-SA message reverses log polarity
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>Number:         59346
>Category:       bin
>Synopsis:       racoon's established IPsec-SA message reverses log polarity
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Apr 23 15:40:00 +0000 2025
>Originator:     cagney
>Release:        10.1
>Organization:
>Environment:
NetBSD west 10.1 NetBSD 10.1 (GENERIC) #0: Mon Dec 16 13:08:11 UTC 2024  mkrepro@mkrepro.NetBSD.org:/usr/src/sys/arch/amd64/compile/GENERIC amd64

>Description:
The machine 192.1.2.45:

vioif1: flags=0x8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
	ec_capabilities=0x1<VLAN_MTU>
	ec_enabled=0
	address: 12:00:00:64:64:45
	status: active
	inet6 fe80::1000:ff:fe64:6445%vioif1/64 flags 0 scopeid 0x2
	inet6 2001:db8:1:2::45/64 flags 0
	inet 192.1.2.45/24 broadcast 192.1.2.255 flags 0

establishes an IPsec SA with the machine 192.1.2.23:

[root@west interop-racoon-10-aggr-initiator-ikev1]# racoonctl show-sa esp
192.1.2.23 192.1.2.45 
	esp mode=tunnel spi=255250(0x0003e512) reqid=0(0x00000000)
	E: aes-cbc  488b0c0a 4350bb92 ea4bd669 86109375
	A: hmac-sha1  bdf4f860 37bb2b09 5d950f94 29685420 9dbcc73e
	seq=0x00000000 replay=4 flags=0x00000000 state=mature 
	created: Apr 23 15:16:00 2025	current: Apr 23 15:17:09 2025
	diff: 69(s)	hard: 43200(s)	soft: 34560(s)
	last: Apr 23 15:15:41 2025	hard: 0(s)	soft: 0(s)
	current: 0(bytes)	hard: 0(bytes)	soft: 0(bytes)
	allocated: 0	hard: 0	soft: 0
	sadb_seq=1 pid=1023 refcnt=0
192.1.2.45 192.1.2.23 
	esp mode=tunnel spi=1682472294(0x64487d66) reqid=0(0x00000000)
	E: aes-cbc  f15777c6 5ab30070 db458007 4f70e1c7
	A: hmac-sha1  8a0238a9 2ca7dbab 2b47c692 e7f595d2 2664b455
	seq=0x00000000 replay=4 flags=0x00000000 state=mature 
	created: Apr 23 15:16:00 2025	current: Apr 23 15:17:09 2025
	diff: 69(s)	hard: 43200(s)	soft: 34560(s)
	last: Apr 23 15:15:41 2025	hard: 0(s)	soft: 0(s)
	current: 0(bytes)	hard: 0(bytes)	soft: 0(bytes)
	allocated: 0	hard: 0	soft: 0
	sadb_seq=0 pid=1023 refcnt=0

looking carefully, at SRC, DST, and SPI, there's:

192.1.2.23 192.1.2.45 spi=255250(0x0003e512) inbound?
192.1.2.45 192.1.2.23 spi=1682472294(0x64487d66) outbound?

now compare that to the log messages emitted by racoon when things establish:

2025-04-23 15:15:59: INFO: initiate new phase 2 negotiation: 192.1.2.45[500]<=>192.1.2.23[500]
2025-04-23 15:15:59: INFO: IPsec-SA established: ESP/Tunnel 192.1.2.45[500]->192.1.2.23[500] spi=255250(0x3e512)
2025-04-23 15:15:59: INFO: IPsec-SA established: ESP/Tunnel 192.1.2.45[500]->192.1.2.23[500] spi=1682472294(0x64487d66)

note the `->`.  The SPI is for 192.1.2.23->192.1.2.45, i.e., the reverse.
>How-To-Repeat:

>Fix:

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