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From: Aleksander Morgado <aleksander@aleksander.es>
To: s.hauer@pengutronix.de, barebox@lists.infradead.org
Cc: Aleksander Morgado <aleksander@aleksander.es>
Subject: [PATCH 03/16] ratp: send missing RST in behavior C2
Date: Thu, 15 Jun 2017 13:14:07 +0200	[thread overview]
Message-ID: <20170615111420.5318-4-aleksander@aleksander.es> (raw)
In-Reply-To: <20170615111420.5318-1-aleksander@aleksander.es>

The reference says:

    If SYN was set we assume that the other end crashed and has
    attempted to open a new connection.  We respond by sending a
    legal reset:
        <SN=received AN><AN=received SN+1 modulo 2><CTL=RST, ACK>

Add this missing step.

Signed-off-by: Aleksander Morgado <aleksander@aleksander.es>
---
 lib/ratp.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/ratp.c b/lib/ratp.c
index e9536499e..a8ac52c75 100644
--- a/lib/ratp.c
+++ b/lib/ratp.c
@@ -731,8 +731,15 @@ static int ratp_behaviour_c2(struct ratp_internal *ri, void *pkt)
 		return 1;
 
 	if (hdr->control & RATP_CONTROL_SYN) {
+		uint8_t control;
+
 		ri->status = -ECONNRESET;
 		pr_debug("Error: Connection reset\n");
+
+		control = RATP_CONTROL_RST | RATP_CONTROL_ACK |
+			ratp_set_sn(ratp_an(hdr)) | ratp_set_an(!ratp_sn(hdr));
+		ratp_send_hdr(ri, control);
+
 		ratp_state_change(ri, RATP_STATE_CLOSED);
 		return 1;
 	}
-- 
2.13.1


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  parent reply	other threads:[~2017-06-15 11:15 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-15 11:14 [PATCH 00/16] RATP logic fixes and improvements Aleksander Morgado
2017-06-15 11:14 ` [PATCH 01/16] ratp: add missing transition to SYN-RECEIVED in behavior B Aleksander Morgado
2017-06-15 11:14 ` [PATCH 02/16] ratp: avoid unnecessary variable initializations Aleksander Morgado
2017-06-15 11:14 ` Aleksander Morgado [this message]
2017-06-15 11:14 ` [PATCH 04/16] ratp: add missing RST flag in behavior G Aleksander Morgado
2017-06-15 11:14 ` [PATCH 05/16] ratp: completely ignore RST flagged packets " Aleksander Morgado
2017-06-15 11:14 ` [PATCH 06/16] ratp: fix data presence check Aleksander Morgado
2017-06-15 11:14 ` [PATCH 07/16] ratp: fix single byte sending flagged with SO Aleksander Morgado
2017-06-15 11:14 ` [PATCH 08/16] ratp: remove bogus data checks in behavior C2 Aleksander Morgado
2017-06-15 11:14 ` [PATCH 09/16] ratp: remove FIXME comment: FIN always requires ACK Aleksander Morgado
2017-06-15 11:14 ` [PATCH 10/16] ratp: fix sending ACKs without data Aleksander Morgado
2017-06-15 11:14 ` [PATCH 11/16] ratp: consolidate ratp_sn_expected() and ratp_an_expected() Aleksander Morgado
2017-06-15 11:14 ` [PATCH 12/16] ratp: prefer using ratp_send_ack() in behaviour I1 Aleksander Morgado
2017-06-15 11:14 ` [PATCH 13/16] ratp: send initial data in behaviour B if any pending Aleksander Morgado
2017-06-15 11:14 ` [PATCH 14/16] ratp: don't ignore data that may arrive in behaviour H1 Aleksander Morgado
2017-06-15 11:14 ` [PATCH 15/16] ratp: consolidate setting the next AN or SN flags Aleksander Morgado
2017-06-15 11:14 ` [PATCH 16/16] ratp: user close may happen in SYN-RECEIVED state Aleksander Morgado
2017-06-19  6:46 ` [PATCH 00/16] RATP logic fixes and improvements Sascha Hauer
2017-06-19  9:07   ` Aleksander Morgado
2017-06-19  9:37     ` Sascha Hauer

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