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Diffstat (limited to 'hicn-light/src/core/mapMe.c')
| -rwxr-xr-x | hicn-light/src/core/mapMe.c | 816 |
1 files changed, 816 insertions, 0 deletions
diff --git a/hicn-light/src/core/mapMe.c b/hicn-light/src/core/mapMe.c new file mode 100755 index 000000000..4444bcf15 --- /dev/null +++ b/hicn-light/src/core/mapMe.c @@ -0,0 +1,816 @@ +/* + * Copyright (c) 2017-2019 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/** + * @file mapMe.c + * @brief MAP-Me : AnchorLess Producer Mobility Management. + */ + +#ifdef WITH_MAPME + +#include <hicn/hicn.h> +#include <src/core/mapMe.h> +#include <stdio.h> // printf + +#include <src/core/connectionList.h> +#include <src/core/forwarder.h> +#include <src/core/logger.h> +#include <src/core/message.h> +#include <src/core/messagePacketType.h> // packet types +#include <src/core/ticks.h> +#include <src/processor/fibEntry.h> +#include <src/processor/pitEntry.h> + +#include <parc/algol/parc_HashMap.h> +#include <parc/algol/parc_Iterator.h> +#include <parc/algol/parc_Unsigned.h> +#include <parc/assert/parc_Assert.h> + +#define MS2NS(x) x * 1000000 +#define T2NS(x) forwarder_TicksToNanos(x) + +#define MAPME_DEFAULT_TU 5000 /* ms */ +#define MAPME_DEFAULT_RETX 500 /* ms */ +#define MAX_RETX 3 + +#define NOT_A_NOTIFICATION false +#define NO_INGRESS 0 +#define TIMER_NO_REPEAT false + +#define DO_DISCOVERY 1 +#define MAPME_INVALID_DICOVERY_SEQ -1 + +#define LOG_FACILITY LoggerFacility_Core + +#define LOG(mapme, log_level, fmt, ...) \ + do { \ + Logger *logger = forwarder_GetLogger(mapme->forwarder); \ + if (logger_IsLoggable(logger, LOG_FACILITY, log_level)) { \ + logger_Log(logger, LOG_FACILITY, log_level, __func__, fmt, \ + ##__VA_ARGS__); \ + } \ + } while (0) + +#define WARN(mapme, fmt, ...) \ + LOG(mapme, PARCLogLevel_Warning, fmt, ##__VA_ARGS__) +#define ERROR(mapme, fmt, ...) \ + LOG(mapme, PARCLogLevel_Error, fmt, ##__VA_ARGS__) +#define INFO(mapme, fmt, ...) LOG(mapme, PARCLogLevel_Info, fmt, ##__VA_ARGS__) +#define DEBUG(mapme, fmt, ...) \ + LOG(mapme, PARCLogLevel_Debug, fmt, ##__VA_ARGS__) + +/** + * MAP-Me state data structure + */ +struct mapme { + uint32_t retx; /* ms */ + uint32_t Tu; /* ms */ + bool removeFibEntries; + + Forwarder *forwarder; +}; + +static MapMe MapMeDefault = {.retx = MAPME_DEFAULT_RETX, + .Tu = MAPME_DEFAULT_TU, + .removeFibEntries = false}; + +/******************************************************************************/ + +#include <src/core/connection.h> + +bool mapMe_Init(MapMe **mapme, Forwarder *forwarder) { + *mapme = malloc(sizeof(MapMe)); + if (!mapme) goto ERR_MALLOC; + + /* Internal state : set default values */ + memcpy(*mapme, &MapMeDefault, sizeof(MapMe)); + + (*mapme)->forwarder = forwarder; + + /* Install hook on Face events to onConnectionAdded */ + // see. config/configuration.c + + /* Install hook for signalization processing. See : + * - io/hicnListener.c + * - src/core/connection.{c,h} + */ + + ERROR((*mapme), "MapMe"); + + return true; + +ERR_MALLOC: + return false; +} + +/****************************************************************************** + * TFIB + ******************************************************************************/ + +#define INVALID_SEQ 0 +#define INIT_SEQ 1 + +typedef struct { + uint32_t seq; + PARCHashMap *nexthops; + /* Update/Notification heuristic */ + Ticks lastAckedUpdate; // XXX This is only for producer !!! +} MapMeTFIB; + +static MapMeTFIB *mapMeTFIB_Create() { + MapMeTFIB *tfib; + tfib = malloc(sizeof(MapMeTFIB)); + if (!tfib) goto ERR_MALLOC; + tfib->seq = 0; + tfib->lastAckedUpdate = 0; + tfib->nexthops = parcHashMap_Create(); + if (!tfib->nexthops) goto ERR_HASHMAP; + + return tfib; + +ERR_HASHMAP: + free(tfib); +ERR_MALLOC: + return NULL; +} + +void mapMeTFIB_Release(MapMeTFIB **tfibPtr) { + MapMeTFIB *tfib = *tfibPtr; + parcHashMap_Release(&tfib->nexthops); + free(tfib); + *tfibPtr = NULL; +} + +/** + * @function mapMe_CreateTFIB + * @abstract Associate a new TFIB entry to a FIB entry. + * @param [in] - Pointer to the FIB entry. + * @return Boolean indicating the success of the operation. + */ +static void mapMe_CreateTFIB(FibEntry *fibEntry) { + MapMeTFIB *tfib; + + /* Make sure we don't already have an associated TFIB entry */ + tfib = fibEntry_getUserData(fibEntry); + // assertNull(tfib); + + tfib = mapMeTFIB_Create(); + fibEntry_setUserData(fibEntry, tfib, (void (*)(void **))mapMeTFIB_Release); +} + +#define TFIB(fibEntry) ((MapMeTFIB *)fibEntry_getUserData(fibEntry)) + +static const PARCEventTimer *mapMeTFIB_Get(const MapMeTFIB *tfib, + unsigned conn_id) { + const PARCEventTimer *timer; + const PARCBuffer *buffer; + PARCUnsigned *cid = parcUnsigned_Create(conn_id); + buffer = parcHashMap_Get(tfib->nexthops, cid); + if (!buffer) return NULL; + PARCByteArray *array = parcBuffer_Array(buffer); + timer = *((PARCEventTimer **)parcByteArray_Array(array)); + parcUnsigned_Release(&cid); + return timer; +} + +static void mapMeTFIB_Put(MapMeTFIB *tfib, unsigned conn_id, + const PARCEventTimer *timer) { + /* NOTE: Timers are not objects (the only class not being an object in + * fact), and as such, we cannot use them as values for the HashMap. + * Just like for unsigned we needed the PARC wrapper. + * There is no wrapper for pointers, so we use Arrays, which has an ubly + * syntax... + */ + PARCUnsigned *cid = parcUnsigned_Create(conn_id); + PARCBuffer *buffer = + parcBuffer_CreateFromArray(&timer, sizeof(PARCEventTimer *)); + parcHashMap_Put(tfib->nexthops, cid, buffer); + parcUnsigned_Release(&cid); + parcBuffer_Release(&buffer); +} + +static void mapMeTFIB_Remove(MapMeTFIB *tfib, unsigned conn_id) { + // Who releases the timer ? + PARCUnsigned *cid = parcUnsigned_Create(conn_id); + parcHashMap_Remove(tfib->nexthops, cid); + parcUnsigned_Release(&cid); +} + +static PARCIterator *mapMeTFIB_CreateKeyIterator(const MapMeTFIB *tfib) { + return parcHashMap_CreateKeyIterator(tfib->nexthops); +} + +int hicn_prefix_from_name(const Name *name, hicn_prefix_t *prefix) { + NameBitvector *bv = name_GetContentName(name); + ip_address_t ip_address; + nameBitvector_ToIPAddress(bv, &ip_address); + + /* The name length will be equal to ip address' prefix length */ + return hicn_prefix_create_from_ip_address(&ip_address, prefix); +} + +static Message *mapMe_createMessage(const MapMe *mapme, const Name *name, + mapme_params_t *params) { + Ticks now = forwarder_GetTicks(mapme->forwarder); + Logger *logger = logger_Acquire(forwarder_GetLogger(mapme->forwarder)); + + INFO(mapme, "[MAP-Me] CreateMessage type=%d seq=%d", params->type, + params->seq); + + size_t size = (params->protocol == IPPROTO_IPV6) ? HICN_MAPME_V6_HDRLEN + : HICN_MAPME_V4_HDRLEN; + uint8_t *icmp_pkt = parcMemory_AllocateAndClear(size); + + hicn_prefix_t prefix; + int rc = hicn_prefix_from_name(name, &prefix); + if (rc < 0) { + ERROR(mapme, "[MAP-Me] Failed to create lib's name"); + goto ERR_NAME; + } + + INFO(mapme, "[MAP-Me] Creating MAP-Me packet"); + size_t len = hicn_mapme_create_packet(icmp_pkt, &prefix, params); + if (len != 0) { + ERROR(mapme, "[MAP-Me] Failed to create mapme packet through lib"); + goto ERR_CREATE; + } + + // hicn_packet_dump(icmp_pkt, MAPME_HDRLEN); + + return message_CreateFromByteArray(NO_INGRESS, icmp_pkt, + MessagePacketType_Interest, now, logger); + +ERR_CREATE: +ERR_NAME: + return NULL; +} + +static Message *mapMe_createAckMessage(const MapMe *mapme, + const uint8_t *msgBuffer, + const mapme_params_t *params) { + Ticks now = forwarder_GetTicks(mapme->forwarder); + Logger *logger = logger_Acquire(forwarder_GetLogger(mapme->forwarder)); + + size_t size = (params->protocol == IPPROTO_IPV6) ? HICN_MAPME_V6_HDRLEN + : HICN_MAPME_V4_HDRLEN; + uint8_t *icmp_pkt = parcMemory_AllocateAndClear(size); + memcpy(icmp_pkt, msgBuffer, size); + + size_t len = hicn_mapme_create_ack(icmp_pkt, params); + if (len != size) { + ERROR(mapme, "[MAP-Me] Failed to create mapme ack packet through lib"); + return NULL; + } + + return message_CreateFromByteArray( + NO_INGRESS, icmp_pkt, MessagePacketType_ContentObject, now, logger); +} + +struct setFacePendingArgs { + const MapMe *mapme; + const Name *name; + FibEntry *fibEntry; + unsigned conn_id; + bool send; + bool is_first; + uint32_t num_retx; +}; + +static bool mapMe_setFacePending(const MapMe *mapme, const Name *name, + FibEntry *fibEntry, unsigned conn_id, + bool send, bool is_first, uint32_t num_retx); + +static void mapMe_setFacePendingCallback(int fd, PARCEventType which_event, + void *data) { + struct setFacePendingArgs *args = (struct setFacePendingArgs *)data; + + parcAssertTrue(which_event & PARCEventType_Timeout, + "Event incorrect, expecting %X set, got %X", + PARCEventType_Timeout, which_event); + + INFO(args->mapme, "Timeout during retransmission. Re-sending"); + mapMe_setFacePending(args->mapme, args->name, args->fibEntry, args->conn_id, + args->send, args->is_first, args->num_retx); +} + +/** + * @brief Update/Notification heuristic: + * + * NOTE: IN are currently disabled until the proper placeholder is agreed in the + * interest header. + */ +static hicn_mapme_type_t mapMe_getTypeFromHeuristic(const MapMe *mapme, + FibEntry *fibEntry) { +#if 0 /* interplay of IU/IN */ + if (TFIB(fibEntry)->lastAckedUpdate == 0) { + return UPDATE; + } else { + Ticks interval = now - TFIB(fibEntry)->lastAckedUpdate; + return (T2NS(interval) > MS2NS(mapme->Tu)) ? UPDATE : NOTIFICATION; + } +#else /* Always send IU */ + return UPDATE; +#endif +} + +static bool mapMe_setFacePending(const MapMe *mapme, const Name *name, + FibEntry *fibEntry, unsigned conn_id, + bool send, bool is_first, uint32_t num_retx) { + int rc; + + INFO(mapme, "[MAP-Me] SetFacePending connection=%d prefix=XX retx=%d", + conn_id, num_retx); + + /* NOTE: if the face is pending an we receive an IN, maybe we should not + * cancel the timer + */ + Dispatcher *dispatcher = forwarder_GetDispatcher(mapme->forwarder); + PARCEventTimer *timer; + + // NOTE + // - at producer, send always true, we always send something reliably so we + // set the timer. + // - in the network, we always forward an IU, and never an IN + if (is_first || send) { + // XXX + mapme_params_t params = { + .protocol = IPPROTO_IPV6, + .type = is_first ? mapMe_getTypeFromHeuristic(mapme, fibEntry) : UPDATE, + .seq = TFIB(fibEntry)->seq}; + Message *special_interest = mapMe_createMessage(mapme, name, ¶ms); + if (!special_interest) { + INFO(mapme, "[MAP-Me] Could not create special interest"); + return false; + } + + const ConnectionTable *table = + forwarder_GetConnectionTable(mapme->forwarder); + const Connection *conn = + connectionTable_FindById((ConnectionTable *)table, conn_id); + if (conn) { + INFO(mapme, "[MAP-Me] Sending MAP-Me packet"); + connection_ReSend(conn, special_interest, NOT_A_NOTIFICATION); + } else { + INFO(mapme, "[MAP-Me] Stopped retransmissions as face went down"); + } + + if (num_retx < MAX_RETX) { + INFO(mapme, "[MAP-Me] - Scheduling retransmission\n"); + /* Schedule retransmission */ + struct setFacePendingArgs *args = + malloc(sizeof(struct setFacePendingArgs)); + if (!args) goto ERR_MALLOC; + args->mapme = mapme; + args->name = name; + args->fibEntry = fibEntry; + args->conn_id = conn_id; + args->send = send; + args->is_first = is_first; + args->num_retx = num_retx + 1; + + timer = dispatcher_CreateTimer(dispatcher, TIMER_NO_REPEAT, + mapMe_setFacePendingCallback, args); + struct timeval timeout = {mapme->retx / 1000, + (mapme->retx % 1000) * 1000}; + rc = parcEventTimer_Start(timer, &timeout); + if (rc < 0) goto ERR_TIMER; + } else { + INFO(mapme, "[MAP-Me] Last retransmission."); + timer = NULL; + } + } else { + INFO(mapme, "[MAP-Me] - not forwarding as send is False"); + timer = NULL; + } + + PARCEventTimer *oldTimer = + (PARCEventTimer *)mapMeTFIB_Get(TFIB(fibEntry), conn_id); + if (oldTimer) { + INFO(mapme, "[MAP-Me] - Found old timer, would need to cancel !"); + // parcEventTimer_Stop(oldTimer); + } + INFO(mapme, "[MAP-Me] - Putting new timer in TFIB"); + if (timer) mapMeTFIB_Put(TFIB(fibEntry), conn_id, timer); + + return true; + +ERR_MALLOC: +ERR_TIMER: + return false; +} + +/*------------------------------------------------------------------------------ + * Event handling + *----------------------------------------------------------------------------*/ + +/* + * Return true if we have at least one local connection as next hop + */ +static bool mapMe_hasLocalNextHops(const MapMe *mapme, + const FibEntry *fibEntry) { + const NumberSet *nexthops = fibEntry_GetNexthops(fibEntry); + const ConnectionTable *table = forwarder_GetConnectionTable(mapme->forwarder); + + for (size_t j = 0; j < fibEntry_NexthopCount(fibEntry); j++) { + /* Retrieve Nexthop #j */ + unsigned conn_id = numberSet_GetItem(nexthops, j); + const Connection *conn = + connectionTable_FindById((ConnectionTable *)table, conn_id); + + /* Ignore non-local connections */ + if (!connection_IsLocal(conn)) continue; + /* We don't need to test against conn_added since we don't + * expect it to have any entry in the FIB */ + + return true; + } + return false; +} + +/* + * Callback called everytime a new connection is created by the control protocol + */ +void mapMe_onConnectionAdded(const MapMe *mapme, const Connection *conn_added) { + /* bool ret; */ + FibEntryList *fiblist; + + /* Ignore local connections corresponding to applications for now */ + if (connection_IsLocal(conn_added)) return; + + unsigned conn_added_id = connection_GetConnectionId(conn_added); + INFO(mapme, "[MAP-Me] New connection %d", conn_added_id); + + /* + * Iterate on FIB to find locally served prefix + * Ideally, we want to avoid a FIB scan everytime a face is added/removed + */ + fiblist = forwarder_GetFibEntries(mapme->forwarder); + for (size_t i = 0; i < fibEntryList_Length(fiblist); i++) { + FibEntry *fibEntry = (FibEntry *)fibEntryList_Get(fiblist, i); + const Name *name = fibEntry_GetPrefix(fibEntry); + + /* Skip entries that have no local connection as next hop */ + if (!mapMe_hasLocalNextHops(mapme, fibEntry)) continue; + + /* This entry corresponds to a locally served prefix, set + * Special Interest */ + if (!TFIB(fibEntry)) /* Create TFIB associated to FIB entry */ + mapMe_CreateTFIB(fibEntry); + TFIB(fibEntry)->seq++; + + char *name_str = name_ToString(name); + INFO(mapme, "[MAP-Me] sending IU/IN for name %s on connection %d", name_str, + conn_added_id); + free(name_str); + + mapMe_setFacePending(mapme, name, fibEntry, conn_added_id, true, true, 0); + } +} + +/*------------------------------------------------------------------------------ + * Special Interest handling + *----------------------------------------------------------------------------*/ + +/** + * @discussion This function is way too long and should be cut out + */ +static bool mapMe_onSpecialInterest(const MapMe *mapme, + const uint8_t *msgBuffer, + unsigned conn_in_id, hicn_prefix_t *prefix, + mapme_params_t *params) { + const ConnectionTable *table = forwarder_GetConnectionTable(mapme->forwarder); + /* The cast is needed since connectionTable_FindById miss the + * const qualifier for the first parameter */ + const Connection *conn_in = + connectionTable_FindById((ConnectionTable *)table, conn_in_id); + seq_t fibSeq, seq = params->seq; + bool send = (params->type == UPDATE); + bool rv; + + Name *name = name_CreateFromPacket(msgBuffer, MessagePacketType_Interest); + char *name_str = name_ToString(name); + INFO(mapme, + "[MAP-Me] Ack'ed Special Interest on connection %d - prefix=%s type=XX " + "seq=%d", + conn_in_id, name_str, seq); + free(name_str); + + /* + * Immediately send an acknowledgement back on the ingress connection + * We always ack, even duplicates. + */ + Message *ack = mapMe_createAckMessage(mapme, msgBuffer, params); + if (!ack) goto ERR_ACK_CREATE; + rv = connection_ReSend(conn_in, ack, NOT_A_NOTIFICATION); + if (!rv) goto ERR_ACK_SEND; + message_Release(&ack); + + /* EPM on FIB */ + /* only the processor has access to the FIB */ + FIB *fib = forwarder_getFib(mapme->forwarder); + + FibEntry *fibEntry = fib_Contains(fib, name); + if (!fibEntry) { + INFO(mapme, + "[MAP-Me] - Re-creating FIB entry with next hop on connection %d", + conn_in_id); + /* + * This might happen for a node hosting a producer which has moved. + * Destroying the face has led to removing all corresponding FIB + * entries. In that case, we need to correctly restore the FIB entries. + */ + strategy_type fwdStrategy = LAST_STRATEGY_VALUE; + + fibEntry = fibEntry_Create(name, fwdStrategy); + fibEntry_AddNexthopByConnectionId(fibEntry, conn_in_id); + mapMe_CreateTFIB(fibEntry); + TFIB(fibEntry)->seq = seq; // INIT_SEQ; + fib_Add(fib, fibEntry); + return true; // with proper seq, we are done + + } else if (!TFIB(fibEntry)) { + /* Create TFIB associated to FIB entry */ + INFO(mapme, + "[MAP-Me] - Creating TFIB entry with default sequence number"); + mapMe_CreateTFIB(fibEntry); + } + + fibSeq = TFIB(fibEntry)->seq; + if (seq > fibSeq) { + INFO(mapme, + "[MAP-Me] - Higher sequence number than FIB %d, updating seq and " + "next hops", + fibSeq); + /* This has to be done first to allow processing SpecialInterestAck's */ + TFIB(fibEntry)->seq = seq; + + /* Reliably forward the IU on all prevHops */ + INFO(mapme, "[MAP-Me] - (1/3) processing prev hops"); + if (params->type == UPDATE) { + PARCIterator *iterator = mapMeTFIB_CreateKeyIterator(TFIB(fibEntry)); + while (parcIterator_HasNext(iterator)) { + PARCUnsigned *cid = parcIterator_Next(iterator); + unsigned conn_id = parcUnsigned_GetUnsigned(cid); + INFO(mapme, "[MAP-Me] - Re-sending IU to pending connection %d", + conn_id); + mapMe_setFacePending(mapme, fibEntry_GetPrefix(fibEntry), fibEntry, + conn_id, false, false, 0); + } + parcIterator_Release(&iterator); + } + + /* nextHops -> prevHops + * + * We add to the list of pendingUpdates the current next hops, and + * eventually forward them an IU too. + * + * Exception: nextHops -> nextHops + * Because of retransmission issues, it is possible that a second interest + * (with same of higher sequence number) is receive from a next-hop + * interface. In that case, the face remains a next hop. + */ + const NumberSet *nexthops_old = fibEntry_GetNexthops(fibEntry); + + /* We make a copy to be able to send IU _after_ updating next hops */ + NumberSet *nexthops = numberSet_Create(); + numberSet_AddSet(nexthops, nexthops_old); + + /* We are considering : * -> nextHops + * + * If inFace was a previous hop, we need to cancel the timer and remove + * the entry. Also, the face should be added to next hops. + * + * Optimization : nextHops -> nextHops + * - no next hop to add + * - we know that inFace was not a previous hop since it was a next hop and + * this forms a partition. No need for a search + */ + + INFO(mapme, "[MAP-Me] - (3/3) next hops ~~> prev hops"); + PARCEventTimer *oldTimer = + (PARCEventTimer *)mapMeTFIB_Get(TFIB(fibEntry), conn_in_id); + if (oldTimer) { + /* This happens if we receive an IU while we are still sending + * one in the other direction + */ + INFO(mapme, "[MAP-Me] - Canceled pending timer"); + parcEventTimer_Stop(oldTimer); + mapMeTFIB_Remove(TFIB(fibEntry), conn_in_id); + } + + /* Remove all next hops */ + for (size_t k = 0; k < numberSet_Length(nexthops_old); k++) { + unsigned conn_id = numberSet_GetItem(nexthops_old, k); + INFO(mapme, "[MAP-Me] - Replaced next hops by connection %d", conn_id); + fibEntry_RemoveNexthopByConnectionId(fibEntry, conn_id); + } + fibEntry_AddNexthopByConnectionId(fibEntry, conn_in_id); + + INFO(mapme, "[MAP-Me] - (2/3) processing next hops"); + bool complete = true; + for (size_t k = 0; k < numberSet_Length(nexthops); k++) { + unsigned conn_id = numberSet_GetItem(nexthops, k); + INFO(mapme, " - Next hop connection %d", conn_id); + if (conn_id == conn_in_id) { + INFO(mapme, " . Ignored this next hop since equal to ingress face"); + continue; + } + + INFO(mapme, "[MAP-Me] - Sending IU on current next hop connection %d", + conn_id); + mapMe_setFacePending(mapme, fibEntry_GetPrefix(fibEntry), fibEntry, + conn_id, send, false, 0); + complete = false; + } + + /* + * The update is completed when the IU could not be sent to any + * other next hop. + */ + if (complete) INFO(mapme, "[MAP-Me] - Update completed !"); + + numberSet_Release(&nexthops); + + } else if (seq == fibSeq) { + /* + * Multipath, multihoming, multiple producers or duplicate interest + * + * In all cases, we assume the propagation was already done when the first + * interest with the same sequence number was received, so we stop here + * + * It might happen that the previous AP has still a connection to the + * producer and that we received back our own IU. In that case, we just + * need to Ack and ignore it. + */ + if (mapMe_hasLocalNextHops(mapme, fibEntry)) { + INFO(mapme, "[MAP-Me] - Received original interest... Update complete"); + return true; + } + + INFO(mapme, "[MAP-Me] - Adding multipath next hop on connection %d", + conn_in_id); + fibEntry_AddNexthopByConnectionId(fibEntry, conn_in_id); + + } else { // seq < fibSeq + /* + * Face is propagating outdated information, we can just + * consider it as a prevHops. Send the special interest backwards with + * the new sequence number to reconciliate this outdated part of the + * arborescence. + */ + INFO( + mapme, + "[MAP-Me] - Update interest %d -> %d sent backwards on connection %d", + seq, fibSeq, conn_in_id); + mapMe_setFacePending(mapme, fibEntry_GetPrefix(fibEntry), fibEntry, + conn_in_id, send, false, 0); + } + + return true; + +ERR_ACK_SEND: + message_Release(&ack); +ERR_ACK_CREATE: + return false; +} + +void mapMe_onSpecialInterestAck(const MapMe *mapme, const uint8_t *msgBuffer, + unsigned conn_in_id, hicn_prefix_t *prefix, + mapme_params_t *params) { + INFO(mapme, "[MAP-Me] Receive IU/IN Ack on connection %d", conn_in_id); + + const Name *name = + name_CreateFromPacket(msgBuffer, MessagePacketType_Interest); + + FIB *fib = forwarder_getFib(mapme->forwarder); + FibEntry *fibEntry = fib_Contains(fib, name); + parcAssertNotNull(fibEntry, + "No corresponding FIB entry for name contained in IU Ack"); + + /* Test if the latest pending update has been ack'ed, otherwise just ignore */ + seq_t seq = params->seq; + if (seq != INVALID_SEQ) { + seq_t fibSeq = TFIB(fibEntry)->seq; + + if (seq < fibSeq) { + INFO(mapme, + "[MAP-Me] - Ignored special interest Ack with seq=%u, expected %u", + seq, fibSeq); + return; + } + } + + /* + * Ignore the Ack if no TFIB is present, or it has no corresponding entry + * with the ingress face. + * Note: previously, we were creating the TFIB entry + */ + if (!TFIB(fibEntry)) { + INFO(mapme, "[MAP-Me] - Ignored ACK for prefix with no TFIB entry"); + return; + } + + PARCEventTimer *timer = + (PARCEventTimer *)mapMeTFIB_Get(TFIB(fibEntry), conn_in_id); + if (!timer) { + INFO(mapme, + "[MAP-Me] - Ignored ACK for prefix not having the Connection in " + "TFIB entry. Possible duplicate ?"); + return; + } + + /* Stop timer and remove entry from TFIB */ + parcEventTimer_Stop(timer); + mapMeTFIB_Remove(TFIB(fibEntry), conn_in_id); + + INFO(mapme, "[MAP-Me] - Removing TFIB entry for ack on connection %d", + conn_in_id); + + /* We need to update the timestamp only for IU Acks, not for IN Acks */ + if (params->type == UPDATE_ACK) { + INFO(mapme, "[MAP-Me] - Updating LastAckedUpdate"); + TFIB(fibEntry)->lastAckedUpdate = forwarder_GetTicks(mapme->forwarder); + } +} + +/*----------------------------------------------------------------------------- + * Overloaded functions + *----------------------------------------------------------------------------*/ + +/* + * @abstract returns where to forward a normal interests(nexthops) defined by + * mapme, it also set the sequnence number properly if needed + */ + +/****************************************************************************** + * Public functions (exposed in the .h) + ******************************************************************************/ + +/* + * Returns true iif the message corresponds to a MAP-Me packet + */ +bool mapMe_isMapMe(const uint8_t *msgBuffer) { + uint8_t next_header = messageHandler_NextHeaderType(msgBuffer); + + const uint8_t *icmp_ptr; + if (next_header == IPPROTO_ICMP) { + icmp_ptr = msgBuffer + IPV4_HDRLEN; + } else if (next_header == IPPROTO_ICMPV6) { + icmp_ptr = msgBuffer + IPV6_HDRLEN; + } else { + return false; + } + + uint8_t type = ((_icmp_header_t *)icmp_ptr)->type; + uint8_t code = ((_icmp_header_t *)icmp_ptr)->code; + if (HICN_IS_MAPME(type, code)) return true; + + return false; +} + +/** + * @discussion The exact type of the MapMe message is determined after + * reception. In hICN, Interest Update and Notifications look like regular + * Interest packets, and are first punted from the normal path by the forwarder, + * then treated as such in the Listener to reach this function. Acknowledgements + * are received as Content (Data) packets and will land here too. + * + * This function is in charge of abstracting the low-level implementation of + * MAP-Me (eg. ICMP packets) and return higher level messages that can be + * processed by MAP-Me core. + */ +void mapMe_Process(const MapMe *mapme, const uint8_t *msgBuffer, + unsigned conn_id) { + hicn_prefix_t prefix; + mapme_params_t params; + hicn_mapme_parse_packet(msgBuffer, &prefix, ¶ms); + + // XXX Dispatch message dependenging on type + switch (params.type) { + case UPDATE: + case NOTIFICATION: + mapMe_onSpecialInterest(mapme, msgBuffer, conn_id, &prefix, ¶ms); + break; + case UPDATE_ACK: + case NOTIFICATION_ACK: + mapMe_onSpecialInterestAck(mapme, msgBuffer, conn_id, &prefix, ¶ms); + break; + default: + printf("E:Unknown message\n"); + break; + } +} + +#endif /* WITH_MAPME */ |