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path: root/src/vnet/sctp/sctp.h
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2018-02-21SCTP: minor refactorMarco Varlese1-4/+4
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>
2018-02-20SCTP: congestion controlMarco Varlese1-26/+115
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>
2018-02-17SCTP: 'multi-home' supportMarco Varlese1-54/+76
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>
2018-02-15SCTP: fix corrupted buffers seen in output nodeMarco Varlese1-1/+5
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>
2018-02-15SCTP: refactoringMarco Varlese1-14/+3
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>
2018-02-08SCTP: shutdown phaseMarco Varlese1-1/+2
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>
2018-02-06SCTP: handling of heartbeating and max-retransmitsMarco Varlese1-7/+34
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>
2018-02-05SCTP: calculate RTO / RTT and RTTVAR as per RFCMarco Varlese1-14/+59
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>
2018-02-01Out-of-order data chunks handling and moreMarco Varlese1-3/+23
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>
2018-01-31Prep-work patch for congestion-controlMarco Varlese1-30/+99
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>
2018-01-24SCTP stack (RFC4960)Marco Varlese1-0/+645
== 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>