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As per RFC4960 the INIT chunk could be received in unexpected scenarios
and - depending on the state of the internal state-machine - the INIT
chunk requires different treatment.
This patch addresses section 5.2.1 and 5.2.2 of the RFC4960.
Change-Id: Ib23ef490c6a5ca3da6c46a9584b75e7577cb7042
Signed-off-by: Marco Varlese <marco.varlese@suse.com>
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A bug was found when multiple SCTP connections were being opened to the
same SCTP server. This patch addresses that problem, removing the use of
the 'parent' pointer approach for sub-connection and saving instead
within the sub-connection itself the ID representing its position. That
facilitates pointer-arithmetic to be computed in the
get_connection_from_transport().
Change-Id: Iaa1f4efc501590be1c93e42fd6fe3d6e02f635eb
Signed-off-by: Marco Varlese <marco.varlese@suse.com>
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This patch adds some missing information in various debugging messages
which can help with debugging state-machine and connection-tracking.
It also renames some internal variable names for better code
readibility.
Change-Id: I68503fc0214300032f7514426c8b5b2b12edf11a
Signed-off-by: Marco Varlese <marco.varlese@suse.com>
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This patch addresses the requirements depicted by section 7.1.1 and
7.1.2 of the RFC 4960. Specifically, it implements the Slow-start and
Congestion-avoidance policies.
The patch also took care of correctly implementing some 'formatting'
functions required - for instance - in packet(s) tracing.
Change-Id: I68eade1b30345de3acb3ac8a653a5ef76eb6d2ac
Signed-off-by: Marco Varlese <marco.varlese@suse.com>
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This patch addresses the SCTP requirement for multiple sub-connections
to implement the so called 'multi-homed' scenario.
Change-Id: Ibce18f216e9d2bebe318992c441bf278e16aad17
Signed-off-by: Marco Varlese <marco.varlese@suse.com>
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The issue observed in the output-node was actually
caused by one of the input-node pushing buffers to
the output node when not required. That is the case
with the parsing/handling of incoming packets like
the COOKIE_ACK, HEARTBEAT_ACK, DATA, SACK which do
not require a response to be sent to the other peer.
In all the mentioned cases the packets (buffers) need
to be consumed and dropped instead of heading to the
output-node.
Change-Id: I3dcbe5de1cedb2ab8b06fff4364749b525cc7ac6
Signed-off-by: Marco Varlese <marco.varlese@suse.com>
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This patch takes care of some refactoring, including the initialization
of the timestamp to calculate the RTO, the output state-machine
validation which can be enabled (disabled by default) when debugging and
some clean-up of unused fields.
It also addresses the requirement of Karn's algorithm when computing the
RTO.
Change-Id: I6b875152369bff23cad085708cec1f7e1151cfa8
Signed-off-by: Marco Varlese <marco.varlese@suse.com>
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This patch addresses some bugs discovered with the shutdown phase which
were causing the actual chunks not to leave the output_node.
While fixing the issue some minor refactoring was also performed to
align the internal functions to a 'common' design.
Change-Id: Ieac4f6e78cffad2e6982536f8e9f190a66f328f7
Signed-off-by: Marco Varlese <marco.varlese@suse.com>
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This patch address the need to send/receive heartbeats between peers.
At the same time, the number of unacked heartbeats is tracked and when
the peer requests to send DATA to the remote-peer the value of unacked
heartbeats needs to be checked against the maximum value allowed for
retransmissions. If the unacked heartbeats value is higher then the
remote-peer is considered unreachable and the connetion needs to be
shutdown.
Change-Id: I2b1a21c26775e734dbe82486f40982ed5702dc63
Signed-off-by: Marco Varlese <marco.varlese@suse.com>
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This patch addresses the need to calculate the RTO / RTT and RTTVAR
according to the rules depicted by the RFC4960 at section 6.3.1
Change-Id: I1d346f3c67610070b3f602f32c7738d58b99ffed
Signed-off-by: Marco Varlese <marco.varlese@suse.com>
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This patch addresses the need to handle out-of-order data chunks
received by a peer. To do that effectively, we had to add the handling
of data chunks flags (E/B/U bit) to understand whether the stream is
fragmenting user-message data and in that case if a fragment is the
FIRST/MIDDLE/LAST one of a transmission.
The same patch also addresses the security requirement to have a HMAC
calculated and incorporated in the INIT_ACK and COOKIE_ECHO chunks. The
algorithm used is the HMAC-SHA1.
Change-Id: Ib6a9a80492e2aafe5c8480d6e02da895efe9f90b
Signed-off-by: Marco Varlese <marco.varlese@suse.com>
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This patch addresses the missing field in various data-structures to
track valuable information to implement the congestion-control
algorithms and manage sub-connections states.
It adds the possibility to queue up to 2 SACKs chunks when the connection
is not gapping.
At the same time, it pushes some variable/field renaming for better
readibility.
Change-Id: Idcc53512983456779600a75e78e21af078e46602
Signed-off-by: Marco Varlese <marco.varlese@suse.de>
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== CONTENT ==
* SCTP chunks definition as per RFC4960;
* Helper functions to set/get values to/from the corresponding chunks;
* Hooks to the session/application layers;
* Complete state-machine handling;
* Implementation for unexpected chunk received in a certain
state (state-machine error handling)
* Support for 1-single connection;
* Sample application to test receive/transmit data-path;
* Test to validate SCTP stack;
Change-Id: I1b55c455ab400be9513f4e094dadfc3181d2ebc9
Signed-off-by: Marco Varlese <marco.varlese@suse.com>
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Marco Varlese
Marco Varlese