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* lib: Fix timeout overflow on 32-bit systems0.20.1Dimitri Staessens2023-11-081-2/+2
| | | | | | | | | | The timeout comparison for keepalives could overflow on 32-bit systems, as times were converted to nanoseconds and be limited to a bit over 4 seconds. This caused flow reads to fail miserably with EFLOWPEER errors when keepalives were set higher on these systems. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Remove pid from flow structDimitri Staessens2023-10-251-4/+0
| | | | | | | | | The pid of the N-1 IPCP process was needlessly stored in the flow struct. We only need it to open the right shared memory maps, which is done when the flow is created. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Make crypt.c independent source fileDimitri Staessens2023-10-251-15/+15
| | | | | | | | | | | The cryptography functions were in a C source that was directly imported into dev.c, enabling ECDHE+AES256 symmetric key encryption on flows. Now crypt.c is an independent source file with associated crypt.h header, to prepare for security management and configuration in the IRMd. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Revise port construct in applicationDimitri Staessens2023-09-201-84/+91
| | | | | | | | | | | | | | | | | | The application had a port construct, which is a leftover from the early days implementing RINA specs, which had a "port_id" to access flows. O7s doesn't really have a "port" concept, only flows. The port_wait_assign function was used in the IPCP to wait for the IRMd to assign the flow_id and return so the flow object could be created. This renames things a bit, and also simplifies the locking to us a single lock/condvar for managing flows. This should be further improved to move the flow state into the flow object, maintain a double mapping of to flow objects (id_to_flow and fd_to_flow) and malloc flow objects at flow allocation, instead of keeping the full table in memory at init to further reduce memory footprint. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Revise application init and finiDimitri Staessens2023-09-201-50/+72
| | | | | | | | The init will now print more useful errors if a process fails to initialize. Also rearranged these procedures a little bit. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Rename portevent to floweventDimitri Staessens2023-09-201-3/+2
| | | | | | | Doesn't make any sense to call it a port event... Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Fix signed/unsigned mismatches on raspbianDimitri Staessens2023-08-231-1/+1
| | | | | | | | Compilation on raspberry pi revealed some previously undetected signed/unsigned comparisons in the library. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Remove while loop around frcti_window_waitDimitri Staessens2023-03-181-4/+3
| | | | | | | That while loop is not needed anymore. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Split flow_alloc from flow_joinDimitri Staessens2023-03-181-20/+68
| | | | | | | | Better to keep these separate during IRMd revision. Moves the qosspec default out of the protobuf message parsing. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* irmd: Add configuration file supportDimitri Staessens2023-03-081-7/+8
| | | | | | | | | | | | | | | | | | | | | This adds initial support for configuration files using the C99 TOML parser (to be installed separately from https://github.com/cktan/tomlc99). The default location for the IRMd configuration file is /etc/ouroboros/irmd.conf. This is configurable at build time. An example file will be installed in the configuration directory with the name irmd.conf.example. Config file support can be disabled using the DISABLE_CONFIGFILE build option. There were some refactors and changes to the configuration messages and protobuf files. This works towards consolidation of protobuf C as an option for more generic handling of serialization/deserialization of various messages. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Refactor hash internalsDimitri Staessens2023-02-231-0/+3
| | | | | | | | The internal hash enum now matches the public one w.r.t. directory hash policies. This removes some unnecessary conversion. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* build: Update copyright to 2023Dimitri Staessens2023-02-131-1/+1
| | | | | | | 2022 was a rather slow year... Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Fix prototypes missing 'void'Dimitri Staessens2023-02-131-3/+3
| | | | | | | Found by Clang version 15. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Fix dealloc with unread keepalivesDimitri Staessens2022-05-251-12/+20
| | | | | | | | | The dealloc call will now always do a non-blocking read before attempting to destroy the rbuff, ensuring all keepalives are processed. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Remove timerwheel from instanceDimitri Staessens2022-04-031-2/+0
| | | | | | | | There was an unused struct timerwheel * lingering in the application instance. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* build: Update copyright to 2022Dimitri Staessens2022-04-031-1/+1
| | | | | | | Growing pains. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Fix fqueue_next handling of deallocated flowsDimitri Staessens2022-04-011-2/+8
| | | | | | | | | If a flow was deallocated while there were still unprocessed events in an fqueue, it would cause a SEGV in fqueue_next because it was not checking the validity of the returned flow descriptor. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Use struct portevent internallyDimitri Staessens2022-03-301-12/+15
| | | | | | | | The fqueues were relying on the fact that the portevent were two integers. This cleans that up a bit. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Fix use-after-free of recv_msgDimitri Staessens2022-03-301-10/+7
| | | | | | | The protobuf message was free'd before usage in flow_init. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Move incoming FRCT handling to own threadDimitri Staessens2022-03-301-24/+67
| | | | | | | | | | | | | | | | The application will now handle incoming FRCT packets even if the application never reads data from the flow (for instance servers). To do this, it reserves an fset_t (id 0). When an FRCT-enabled flow is created, it is automatically added to this fset. An rx thread will listen for incoming events and perform necessary actions on the flow if needed. If the FRCT flow is added to another user fset, it will be handled by that user fset (and if the flow is removed from a user fset, it will be re-added to the set with id 0 to be handled by the rx_flow thread. The flow monitoring is handled by the same thread, replacing the previous monitoring thread. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Iterate over monitored flowsDimitri Staessens2022-03-301-49/+49
| | | | | | | | | | Now the instance keeps all flows for an application in a linked list to easily iterate over all allocated flows, which is needed by the keepalive monitoring. This is more efficient that tracking min and max fd. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Remove flows list from fsetDimitri Staessens2022-03-301-62/+2
| | | | | | | We don't need to iterate fsets anymore since the removal of fset_keepalive. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Fix filtering encrypted packetsDimitri Staessens2022-03-301-2/+54
| | | | | | | | | | | | The frcti_filter was reading raw data from the buffers, causing the frcti_rcv to operate directly on encrypted packets. It decrypt and filter for invalid packets. I moved the function from frct to the fqueue implementation and renamed it fqueue_filter as it filters fqueues. Should be extended to filter out keepalives on non-FRCT flows, as these will now still cause spurious wakeups. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Move flow monitoring to its own threadDimitri Staessens2022-03-301-174/+130
| | | | | | | | | This adds a monitoring thread to handle flow keepalive management in the application and removes the thread interruptions to schedule FRCT calls within the regular IPC calls. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Add np1_flow_read and np1_flow_write callsDimitri Staessens2022-03-301-11/+80
| | | | | | | | | | | | | | | | Reading/writing to (N + 1)-flows from the IPCP was using a raw QoS flow to bypass some functions in the ipcp_flow_read call. But this call was broken for keepalive packets. Fixing the ipcp_flow_read call for (N - 1) flows causes the IPCPs to drop 0-byte keepalive packets coming from (N + 1) client flows. >From now on, there is a dedicated call for (N + 1) reads/writes from the IPCPs that's more efficient and cleaner. The (N + 1) flow internal QoS is now also defaulted to a qos_np1 qosspec, instead of tampering with the qosspec requested by the (N + 1) client. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Move timerwheel processing to its own threadDimitri Staessens2022-03-301-10/+34
| | | | | | | | | | | | | | | This is the first step moving away from scheduling the FRCT and flow monitoring functions as part of the IPC calls (flow_read / flow_write / fevent) and towards the more scalable (and far less complicated) implementation to take care of these functions in separate threads. If a process creates the first flow that requires FRCT, it will spin up a thread to process events on the timerwheel (retransmissions and delayed ACKs). This single thread lives until the last flow with FRCT is deallocated. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Create FRCT instance when initializing flowDimitri Staessens2022-03-301-59/+46
| | | | | | | | The creation of FRCT instances (if needed) is now part of flow_init() call instead of an addition after the flow is initialized. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Refactor writing to rbuffDimitri Staessens2022-03-301-69/+57
| | | | | | | | Writing valid packets to the rbuff (add crc check, encrypt) is now extracted into a function. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Remove prog name and pid from instanceDimitri Staessens2022-03-301-25/+10
| | | | | | | | Prog name is not used anymore, probably a remnant from the early days, when we were passing rina_name_t tuples all over the place. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Refactor reading packet from rbuffDimitri Staessens2022-03-301-60/+71
| | | | | | | | | | | | Reading packets from the rbuff and checking their validity (non-zero size, pass crc check, pass decryption) is now extracted into a function. Also adds a function to get the length of an sdu_du_buff instead of subtracting the tail and head pointers. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Notify once for packets in new fsetDimitri Staessens2022-03-301-4/+1
| | | | | | | | The fset add function was notifying for each packet already stored in the rx rbuff, which isn't needed. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipdpd: Pass MPL to application at flow_allocationDimitri Staessens2022-03-081-4/+17
| | | | | | | | | | | | The maximum packet lifetime (MPL) is a property of the flow that needs to be passed to the reliable transmission protocol (FRCP) for its correct operation. Previously, the value of MPL was set fixed as one of the (fixed) Delta-t parameters. This patch makes the MPL a property of the layer, and it can now be set per layer-type at build time. This is a step towards a proper MPL estimator in the flow allocator. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Pass Delta-t params to frcti_create()Dimitri Staessens2022-03-081-2/+2
| | | | | | | | | The parameters were set directly from the build configs. A first step to making FRCP configurable at runtime, is to pass the parameters to the frcti_create() function. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Fix underflow in keepalive timerDimitri Staessens2022-03-031-1/+1
| | | | | | | If the keepalive would underflow if set to 1-3 ms. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Check return value of rib_initDimitri Staessens2022-03-031-1/+6
| | | | | | | The rib_init return value wasn't checked. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Encrypt bare FRCP messages on encrypted flowsDimitri Staessens2022-03-031-2/+1
| | | | | | | | Bare FRCP messages (ACKs without data, Rendez-vous packets) were not encrypted on encrypted flows, causing the receiver to fail decryption. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Make flow liveness timeout configurableDimitri Staessens2022-03-031-20/+46
| | | | | | | | | The qosspec_t now has a timeout value that sets the timeout value of the flow. Flows with a peer that has timed out will now return -EFLOWPEER on flow_read() or flow_write(). Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Add initial flow liveness monitoringDimitri Staessens2022-02-241-23/+159
| | | | | | | | | | | | | | | | | | This adds flow liveness monitoring for flows, with a fixed timeout of 120s. I will make it configurable at flow allocation later on (timeout needs to be communicated to the peer). If one peer dies, or doesn't call any IPC calls (flow_write/flow_read/fevent) it will stop sending keepalives and the other peer's read/writes will error on an -EFLOWDOWN after the timeout expires. Packets without a payload (0 length packets) are interpreted as keepalive packets for the flow. They can be sent from any application, but they will not trigger a message read at the receiver side (0 as a return value on flow_read indicates a previous partial read has completed at exactly the buffer size). Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Maintain a list of flows in flow_setDimitri Staessens2022-02-241-26/+99
| | | | | | | | | The flow_set will now keep a list of the flows in the set, this makes it more efficient to iterate over the flows. Extending the public API for fset_t with an iterator will also be useful. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Don't use pointer to set FRCT flagsDimitri Staessens2021-12-291-5/+4
| | | | | | | | | | | | | | | | | | The fccntl call FRCTSFLAGS was using a pointer to a flags so set flags, which should just be a regular uint16_t. For instance, the FRCTLINGER flags can now be turned off using fccntl(fd, FRCTSFLAGS, FRCTFRESCNTL | FRCTFRTX) leaving only resource control (flow control, FRCTFRESCNTL) and retransmission enabled. Note that retransmission (FRCTFRTX) can't be enabled or disabled on a live flow, it will be set on flow allocation. Updates the man page for fccntl to add these FRCT options. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Fix waiting for FRCT at deallocationDimitri Staessens2021-12-221-6/+6
| | | | | | | | | | This is a fix to wait for outstanding retransmissions when a flow is deallocated. Instead of waiting the full timeout, it will now wait in the same tic increments used within FRCT. Bit of a stopgap at the moment, FRCT and the flows are in need of a serious refactor. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Remove old rib_fini codeDimitri Staessens2021-12-061-3/+0
| | | | | | | | There was some leftover code in dev.c wrt to the process RIB that is not needed anymore. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Don't initialize process RIB for IPCPsDimitri Staessens2021-07-101-3/+5
| | | | | | | | | | | | | This will skip rib_init() at __init() for IPCPs (or at least, processes that have "ipcpd" in the executable name). The previous code tried to unmount the generic mount and then remount under the ipcp name, but it often failed because fuse_mount() is asynchronous and the mount was not up at the time of the unmount() call. Renaming the mount instead of unmounting failed for the same reason. This is a better fix for now. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Application RIB with FRCT statisticsDimitri Staessens2021-06-301-2/+18
| | | | | | | | | | Application flows can now be monitored from the RIB, exposing FRCT statistics (window edges, retransmission timeout, rtt estimate, etc). Application RIB requires user permissions to be able to access /dev/fuse. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib, ipcpd, irmd: Wrap pthread unlocks for cleanupDimitri Staessens2021-06-231-0/+1
| | | | | | | | | | | | This add an ouroboros/pthread.h header that wraps the pthread_..._unlock() functions for cleanup using pthread_cleanup_push() as this casting is not safe (and there were definitely bad casts in the code). The close() function is now also wrapped for cleanup in ouroboros/sockets.h. This allows enabling more compiler checks. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* build: Update email addressesDimitri Staessens2021-01-031-2/+2
| | | | | | | | The ugent email addresses are shut down, updated to Ouroboros mail addresses. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* build: Update copyright to 2021Dimitri Staessens2021-01-031-1/+1
| | | | | | | Happy New Year, Ouroboros! Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Fix flow_accept without opensslDimitri Staessens2020-12-121-4/+5
| | | | | | | | DH key creation was returning -ECRYPT if opennssl is not installed, instead of success (0). Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Add congestion avoidance policiesDimitri Staessens2020-12-021-0/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This adds congestion avoidance policies to the unicast IPCP. The default policy is a multi-bit explicit congestion avoidance algorithm based on data-center TCP congestion avoidance (DCTCP) to relay information about the maximum queue depth that packets experienced to the receiver. There's also a "nop" policy to disable congestion avoidance for testing and benchmarking purposes. The (initial) API for congestion avoidance policies is: void * (* ctx_create)(void); void (* ctx_destroy)(void * ctx); These calls create / and or destroy a context for congestion control for a specific flow. Thread-safety of the context is the responsability of the flow allocator (operations on the ctx should be performed under a lock). ca_wnd_t (* ctx_update_snd)(void * ctx, size_t len); This is the sender call to update the context, and should be called for every packet that is sent on the flow. The len parameter in this API is the packet length, which allows calculating the bandwidth. It returns an opaque union type that is used for the call to check/wait if the congestion window is open or closed (and allowing to release locks before waiting). bool (* ctx_update_rcv)(void * ctx, size_t len, uint8_t ecn, uint16_t * ece); This is the call to update the flow congestion context on the receiver side. It should be called for every received packet. It gets the ecn value from the packet and its length, and returns the ECE (explicit congestion experienced) value to be sent to the sender in case of congestion. The boolean returned signals whether or not a congestion update needs to be sent. void (* ctx_update_ece)(void * ctx, uint16_t ece); This is the call for the sending side top update the context when it receives an ECE update from the receiver. void (* wnd_wait)(ca_wnd_t wnd); This is a (blocking) call that waits for the congestion window to clear. It should be stateless (to avoid waiting under locks). This may change later on if passing the context is needed for different algorithms. uint8_t (* calc_ecn)(int fd, size_t len); This is the call that intermediate IPCPs(routers) should use to update the ECN field on passing packets. The multi-bit ECN policy bases the value for the ECN field on the depth of the rbuff queue packets will be sent on. I created another call to grab the queue depth as fccntl is write-locking the application. We can further optimize this to avoid most locking on the rbuff. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Add Rendez-Vous mechanism for flow controlDimitri Staessens2020-10-111-2/+1
| | | | | | | | | | | | | This adds the rendez-vous mechanism to handle the case where the sending window is closed and window updates get lost. If the sending window is closed, the sender side will send an RDVS every DELT_RDV time (100ms), and give up after MAX_RDV time (1 second). Upon reception of a RDVS packet, a window update is sent immediately. We can make this much more configurable later on (build options for defaults, fccntl for runtime tuning). Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
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