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From: Phil Sutter <phil@nwl.cc>
To: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: netfilter-devel@vger.kernel.org
Subject: [iptables PATCH v2 1/2] nfnl_osf: Fix broken conversion to nfnl_query()
Date: Fri, 15 May 2020 16:03:29 +0200	[thread overview]
Message-ID: <20200515140330.13669-2-phil@nwl.cc> (raw)
In-Reply-To: <20200515140330.13669-1-phil@nwl.cc>

Due to missing NLM_F_ACK flag in request, nfnetlink code in kernel
didn't create an own ACK message but left it upon subsystem to ACK or
not. Since nfnetlink_osf doesn't ACK by itself, nfnl_query() got stuck
waiting for a reply.

Whoever did the conversion from deprecated nfnl_talk() obviously didn't
even test basic functionality of the tool.

Fixes: 52aa15098ebd6 ("nfnl_osf: Replace deprecated nfnl_talk() by nfnl_query()")
Signed-off-by: Phil Sutter <phil@nwl.cc>
---
 utils/nfnl_osf.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/utils/nfnl_osf.c b/utils/nfnl_osf.c
index 15d531975e11d..922d90ac135b7 100644
--- a/utils/nfnl_osf.c
+++ b/utils/nfnl_osf.c
@@ -378,9 +378,11 @@ static int osf_load_line(char *buffer, int len, int del)
 	memset(buf, 0, sizeof(buf));
 
 	if (del)
-		nfnl_fill_hdr(nfnlssh, nmh, 0, AF_UNSPEC, 0, OSF_MSG_REMOVE, NLM_F_REQUEST);
+		nfnl_fill_hdr(nfnlssh, nmh, 0, AF_UNSPEC, 0, OSF_MSG_REMOVE,
+			      NLM_F_ACK | NLM_F_REQUEST);
 	else
-		nfnl_fill_hdr(nfnlssh, nmh, 0, AF_UNSPEC, 0, OSF_MSG_ADD, NLM_F_REQUEST | NLM_F_CREATE);
+		nfnl_fill_hdr(nfnlssh, nmh, 0, AF_UNSPEC, 0, OSF_MSG_ADD,
+			      NLM_F_ACK | NLM_F_REQUEST | NLM_F_CREATE);
 
 	nfnl_addattr_l(nmh, sizeof(buf), OSF_ATTR_FINGER, &f, sizeof(struct xt_osf_user_finger));
 
-- 
2.26.2


  reply	other threads:[~2020-05-15 14:04 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-15 14:03 [iptables PATCH v2 0/2] Critical: Unbreak nfnl_osf tool Phil Sutter
2020-05-15 14:03 ` Phil Sutter [this message]
2020-05-15 14:03 ` [iptables PATCH v2 2/2] nfnl_osf: Improve error handling Phil Sutter
2020-05-18 15:38   ` Phil Sutter
2020-05-18 14:57 ` [iptables PATCH v2 0/2] Critical: Unbreak nfnl_osf tool Pablo Neira Ayuso

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