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* lib: Make flow liveness timeout configurableDimitri Staessens2022-03-031-2/+5
| | | | | | | | | 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>
* ipcpd: Fix some unchecked return valuesDimitri Staessens2022-03-031-7/+10
| | | | | | | Fixes some unchecked and wrongly checked return values. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Refactor sendingflow allocation responseDimitri Staessens2022-02-211-21/+33
| | | | | | | | Small refactor taking the wait for the flow allocation to complete out. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Refactor flow allocator message handlingDimitri Staessens2022-02-211-113/+170
| | | | | | | | This refactors the single long function that handles incoming packets destined for the flow allocator. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Fix hashing and overlapping memcpy in pffDimitri Staessens2022-02-182-12/+4
| | | | | | | | | The pft hash function assumed mem_hash allocates memory, but it does not. There was also a memcpy with potentially overlapping memory regions, which is undefined behaviour. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Fix deadlock in dht_unregDimitri Staessens2022-02-181-8/+3
| | | | | | | | | The dht_del function was called under lock in dht_unreg, and then tried to take the lock again, a 100% deadlock. Also fix uninitialized value in dht_retrieve. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Use random buffer for flat addressDimitri Staessens2022-02-181-15/+4
| | | | | | | Less code, and less chance of a collision. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Fix bounds check on PROG_MAX_FLOWSDimitri Staessens2022-02-181-2/+2
| | | | | | | Off-by-one error in the bounds check. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Fix initialization of hash width in DHTDimitri Staessens2022-02-171-5/+7
| | | | | | | | | | The width of the Kademlia hash function (dht->b) was set only after the ID was created. This should have failed miserably, but the bytes after were fine as they were just a randomized ID in the Kademlia network. Nasty. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Fix free in fail path of readdirDimitri Staessens2022-02-173-3/+3
| | | | | | | | | The free of the buffer in the failure path of the readdir RIB functions was taking the wrong pointer in a couple of places. The FRCT RIB readdir was missing error handling for malloc and strdup. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Use wrlock for rotating multipath pff entryDimitri Staessens2021-12-291-12/+14
| | | | | | | | The multipath pff entry was modified (rotated) under a read lock, which is now changed to a write lock. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Allow creation of multiple directoriesDimitri Staessens2021-12-295-421/+523
| | | | | | | | | To allow merging large network layers, a situation will arise where multiple directories need to coexist within the layer. This reverts commit 9422e6be94ac1007e8115a920379fd545055e531. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Add dt component to regular startup flowDimitri Staessens2021-12-061-16/+9
| | | | | | | | | The dt component had init/start commands somewhat outside of the overall flow of startup of the unicast IPCP. This was probably some old code and wasn't needed. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Consolidate policies within folderDimitri Staessens2021-12-0611-12/+125
| | | | | | | | Each policy folder will now have a pol.h file, so that (in most cases) adding a new policy only requires changes inside the policy folder. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Make the DHT a directory policyDimitri Staessens2021-12-068-29/+81
| | | | | | | | The DHT is now a proper directory policy instead of a unicast IPCP component. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Move DHT to stackDimitri Staessens2021-12-064-498/+410
| | | | | | | | | | This makes the DHT a single directory implementation and moves it to the stack (init/fini instead of create/destroy). This is a step towards making it a directory policy, in line with our other policy implementations. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Restructure policy codeDimitri Staessens2021-12-0633-72/+106
| | | | | | | | The policies were all in a single folder pol/, and have been moved to a folder per component/mechanism to keep things a bit more orderly. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Fix conversion to uint64_tDimitri Staessens2021-09-051-1/+1
| | | | | | | | The print output for MB-ECN had a size_t conversion to uint64_t that some compilers complain about. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Fix additive increase in CA-MB-ECNDimitri Staessens2021-07-211-2/+2
| | | | | | | | | | | | | | | | | The logic for additive increase was botched. It was adding to the current window limit, and to avoid a count-to-infinity when sending below the limit, I added a check that the application was trying to send more than the current limit. This fails in congestion avoidance mode when the IPCP is throttling traffic below the limit; causing the app to never increase the congestion window (and even worse, to keep decreasing in some cases). The Additive Increase will now always add bandwidth to the latest sending rate instead of the window bandwidth limit, avoiding all the problems. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Fix flow allocator build without fuseDimitri Staessens2021-07-181-3/+4
| | | | | | | | The u_snd and u_rcv variables were not guarded by ifdefs when updating. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Export flow updates sent/recvd to fa RIBDimitri Staessens2021-07-121-1/+9
| | | | | | | | The RIB of the flow allocator will now export the number of flow updates sent/received per flow. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Fix update rate for Multi-Bit ECNDimitri Staessens2021-07-121-1/+1
| | | | | | | | The rate was supposed to be 1 update per 8 data packets, but the calculation was doing 1 update per 4 data packets. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* unicast: Fix RIB stats for congestion avoidanceDimitri Staessens2021-07-101-2/+2
| | | | | | | The upstream/downstream stats were switched. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Pass full path for RIB entriesDimitri Staessens2021-06-293-7/+31
| | | | | | | | | | | | | | | | | | | | | | | | | | | The read functions for the RIB will now receive the full path, instead of only the entry name. For IPCPs, we organized the RIB in an /<ipcp>/<component>/entries structure with a directory per component, so we don't need the full path at this point. For process flow information, it's a lot more convenient to organize it the following way /<pid>/<fd>/stat We can then register/unregister the flow descriptor when the frct instance is created, and for getting the stats, we'd know the flow descriptor from the fuse file path. If we would create a file per flow instead of a directory per flow, something like /<pid>/flows/<fd> we'd need to do additional bookkeeping to list the contents of that directory (we would need to track all flows with an active FRCT instance), that fuse knows because it tracks the directories. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Fix unregistering fa and dt RIBsDimitri Staessens2021-06-282-10/+13
| | | | | | | These RIBs were not properly unregistered on shutdown. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib: Remove struct stat from RIB APIDimitri Staessens2021-06-283-60/+42
| | | | | | | | | | The RIB API had a struct stat in the getattr() function, which made all components that exposed variables via the RIB dependent on <sys/stat.h>. The rib now has its own struct rib_attr to set attributes such as size and last modified time. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* build: Fix compilation with fuse (RIB) on FreeBSDDimitri Staessens2021-06-283-0/+7
| | | | | | | | | | | Compilation failed on FreeBSD 14 with fuse enabled because of some missing definitions. __XSI_VISIBLE must be set before including <ouroboros/rib.h> for some definitions in <sys/stat.h>. FreeBSD doesn't know the MSG_CONFIRM flag to sendto() or CLOCK_REALTIME_COARSE, which are Linux-specific. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Fix missing return statement0.18.2Dimitri Staessens2021-06-231-0/+2
| | | | | | | | | The fa_handle_packet function loop is non-void but didn't have a return statement. Only got picked up if I build from AUR, which is weird. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* lib, ipcpd, irmd: Wrap pthread unlocks for cleanupDimitri Staessens2021-06-233-23/+19
| | | | | | | | | | | | 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>
* ipcpd: Fix buffer overflow in flow allocator RIB.Dimitri Staessens2021-06-211-3/+3
| | | | | | | | Max value of UINT64 can be 20 characters when printed, need an extra byte for sprintf trailing '\0'. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Fix congestion window scalingDimitri Staessens2021-06-211-18/+41
| | | | | | | This fixes scaling of the congestion window, which was a buggy mess. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Move RIB initialization to common groundDimitri Staessens2021-06-211-11/+1
| | | | | | | | | | | | | | This moves Resource Information Base (RIB) initialization into the ipcp_init() function, so all IPCPs initialize a RIB. The RIB not shows some common IPCP information, such as the IPCP name, IPCP state and the layer name if the IPCP is part of a layer. The initialization of the hash algorithm and layer name was moved out of the common ipcp source because IPCPs may only know this information after enrollment. Some IPCPs were not even storing this information. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Fix free of uninitialized variable in graph.cDimitri Staessens2021-05-281-3/+1
| | | | | | | | | The new GCC 11.1 compiler discovered s_dist would be uninitialized with an unknown policy, so it doesn't need to be free'd. Also removes some unneeded includes in broadcast dt.c that I had pending. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* build: Move connmgr and enrolment to common groundDimitri Staessens2021-03-2812-1052/+19
| | | | | | | | | | The connection manager and enrolment components of the unicast and broadcast IPCP have a lot in common, as conjectured in the paper. The initial implementation of the broadcast IPCP just duplicated the code. This moves the shared functionality to common ground. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Don't include enroll.h in connmgrDimitri Staessens2021-02-251-1/+0
| | | | | | | It's not needed to include enroll.h. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* build: Update email addressesDimitri Staessens2021-01-0350-100/+100
| | | | | | | | 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 Staessens2021-01-0350-50/+50
| | | | | | | Happy New Year, Ouroboros! Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Pass qoscube to ECN marking functionDimitri Staessens2020-12-208-3/+13
| | | | | | | | The ECN marking function should be able to use the packet QoS to allow prioritizing traffic under congestion. Not yet implemented in MB-ECN. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Remove unused variable in MB-ECN policyDimitri Staessens2020-12-121-4/+0
| | | | | | | | The t_sent variable is a remnant from the first version and isn't needed anymore. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Pass previous ECN value in congestion APIDimitri Staessens2020-12-128-18/+30
| | | | | | | | The previous value of the ECN field should be passed to the congestion notification function. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Use 64-bit flow endpoint IDs for DTDimitri Staessens2020-12-075-53/+116
| | | | | | | | | | | | | The EIDs are now 64-bit. This makes it a tad harder to guess them (think of port scanning). The implementation has only the most significant 32 bits random to quickly map EIDs to N+1 flows. While this is equivalent to a random cookie as a check on flows, the rationale is that valid endpoint IDs should be pretty hard to guess (and thus be 64-bit random at least). Ideally one would use content-addressable memory for this kind of mapping. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Fix slow start in multi-bit (F)ECN policyDimitri Staessens2020-12-071-8/+11
| | | | | | | | | | | There is a check not to rapidly double the window to astronomical sizes when there is no congestion experienced for long periods of time, but the if-else logic was botched and it still grew to astronomical sizes (albeit linear instead of exponential). I also lowered the ECN threshold a bit. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Remove DT-FA bypass on receiver sideDimitri Staessens2020-12-075-63/+88
| | | | | | | | | | | | | | | | | | | | | | | | | | The DT will now post all packets for N+1 flows through the flow allocator component. This means that N+1 flows can be monitored through the flow allocator stats, and N-1 flows through the DT stats. The DT component still keeps stats for the local components (FA and DHT), but this can be removed once the DHT has its own RIB output. The flow allocator show statistics for Sent packets: total packets that were presented for sending on this specific flow Send failed: packets that were unable to be sent Received packets: total packets that were presented by the DT component on this specific flow Received failed: packets that were unable to be delivered These stats are presented as both packet counts and byte counts. To know how many were successful, the values for failed need to be subtracted from the values for total. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Fix off-by-one in Multi-bit (F)ECN policyDimitri Staessens2020-12-051-2/+1
| | | | | | | | Noticed an off-by-one in the packet counter because it was incremented before and the byte counter after the flow update. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Add RIB statistics for flow allocatorDimitri Staessens2020-12-058-12/+255
| | | | | | | | | | The RIB will now show some stats for the flow allocator, including congestion avoidance statistics. This is needed before decoupling the data transfer component and the flow allocator as some current stats show in DT will move to FA. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Simplify multi-bit (F)ECN policyDimitri Staessens2020-12-021-54/+69
| | | | | | | | | | | | The mb-ecn policy has a couple of divisions in the math, which I wanted to avoid. Now it measures the number of bytes sent in a window, and updates the next window with AIMD logic. If the number of bytes in the window is reached, the call blocks. To avoid long packet bursts, the window size continually scales to contain between CA_MINPS (8) and CA_MAXPS (64) packets. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Don't update for deallocated flowsDimitri Staessens2020-12-021-0/+5
| | | | | | | | | | | The dt component bypasses the flow allocator on the receiver side, and may try to update congestion context when the flow has already been deallocated by the receiver. I will fix this bypass and always pass through the flow allocator sometime soon; for now, I added a check in the flow allocator call to avoid the SEGV. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Fix enrollment for congestion avoidanceDimitri Staessens2020-12-021-0/+3
| | | | | | | | The enrollment procedure was not passing the policy for congestion avoidance. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
* ipcpd: Add congestion avoidance policiesDimitri Staessens2020-12-0213-72/+835
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* ipcpd: Refactor DT componentDimitri Staessens2020-11-111-76/+38
| | | | | | | The flow stats had quite a lot of duplication. Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
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