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From:   Kevin Kou <qdkevin.kou@gmail.com>
To:     vyasevich@gmail.com
Cc:     nhorman@tuxdriver.com, marcelo.leitner@gmail.com,
        davem@davemloft.net, linux-sctp@vger.kernel.org,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        qdkevin.kou@gmail.com
Subject: [PATCH] sctp: do trace_sctp_probe after SACK validation and check
Date:   Fri, 20 Dec 2019 04:47:03 +0000
Message-Id: <20191220044703.88-1-qdkevin.kou@gmail.com>
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Sender: linux-kernel-owner@vger.kernel.org
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The function sctp_sf_eat_sack_6_2 now performs
the Verification Tag validation, Chunk length validation, Bogu check,
and also the detection of out-of-order SACK based on the RFC2960
Section 6.2 at the beginning, and finally performs the further
processing of SACK. The trace_sctp_probe now triggered before
the above necessary validation and check.

This patch is to do the trace_sctp_probe after the necessary check
and validation to SACK.

Signed-off-by: Kevin Kou <qdkevin.kou@gmail.com>
---
 net/sctp/sm_statefuns.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 42558fa..b4a54df 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -3281,7 +3281,6 @@ enum sctp_disposition sctp_sf_eat_sack_6_2(struct net *net,
 	struct sctp_sackhdr *sackh;
 	__u32 ctsn;
 
-	trace_sctp_probe(ep, asoc, chunk);
 
 	if (!sctp_vtag_verify(chunk, asoc))
 		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
@@ -3319,6 +3318,8 @@ enum sctp_disposition sctp_sf_eat_sack_6_2(struct net *net,
 	if (!TSN_lt(ctsn, asoc->next_tsn))
 		return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands);
 
+	trace_sctp_probe(ep, asoc, chunk);
+
 	/* Return this SACK for further processing.  */
 	sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, SCTP_CHUNK(chunk));
 
-- 
1.8.3.1