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-rw-r--r--src/dht/gnunet-service-dht_routing.c383
1 files changed, 383 insertions, 0 deletions
diff --git a/src/dht/gnunet-service-dht_routing.c b/src/dht/gnunet-service-dht_routing.c
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+/*
+ This file is part of GNUnet.
+ (C) 2011 Christian Grothoff (and other contributing authors)
+
+ GNUnet is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3, or (at your
+ option) any later version.
+
+ GNUnet is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNUnet; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file dht/gnunet-service-dht_routing.c
+ * @brief GNUnet DHT tracking of requests for routing replies
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "gnunet-service-dht_neighbours.h"
+#include "gnunet-service-dht_routing.h"
+#include "gnunet-service-dht.h"
+
+
+/**
+ * Number of requests we track at most (for routing replies).
+ */
+#define DHT_MAX_RECENT (1024 * 16)
+
+
+/**
+ * Information we keep about all recent GET requests
+ * so that we can route replies.
+ */
+struct RecentRequest
+{
+
+ /**
+ * The peer this request was received from.
+ */
+ struct GNUNET_PeerIdentity peer;
+
+ /**
+ * Key of this request.
+ */
+ GNUNET_HashCode key;
+
+ /**
+ * Position of this node in the min heap.
+ */
+ struct GNUNET_CONTAINER_HeapNode *heap_node;
+
+ /**
+ * Bloomfilter for replies to drop.
+ */
+ struct GNUNET_CONTAINER_BloomFilter *reply_bf;
+
+ /**
+ * Type of the requested block.
+ */
+ enum GNUNET_BLOCK_Type type;
+
+ /**
+ * extended query (see gnunet_block_lib.h). Allocated at the
+ * end of this struct.
+ */
+ const void *xquery;
+
+ /**
+ * Number of bytes in xquery.
+ */
+ size_t xquery_size;
+
+ /**
+ * Mutator value for the reply_bf, see gnunet_block_lib.h
+ */
+ uint32_t reply_bf_mutator;
+
+ /**
+ * Request options.
+ */
+ enum GNUNET_DHT_RouteOption options;
+
+};
+
+
+/**
+ * Recent requests by time inserted.
+ */
+static struct GNUNET_CONTAINER_Heap *recent_heap;
+
+/**
+ * Recently seen requests by key.
+ */
+static struct GNUNET_CONTAINER_MultiHashMap *recent_map;
+
+
+/**
+ * Closure for the 'process' function.
+ */
+struct ProcessContext
+{
+ /**
+ * Path of the original PUT
+ */
+ const struct GNUNET_PeerIdentity *put_path;
+
+ /**
+ * Path of the reply.
+ */
+ const struct GNUNET_PeerIdentity *get_path;
+
+ /**
+ * Payload of the reply.
+ */
+ const void *data;
+
+ /**
+ * Expiration time of the result.
+ */
+ struct GNUNET_TIME_Absolute expiration_time;
+
+ /**
+ * Number of entries in 'put_path'.
+ */
+ unsigned int put_path_length;
+
+ /**
+ * Number of entries in 'get_path'.
+ */
+ unsigned int get_path_length;
+
+ /**
+ * Number of bytes in 'data'.
+ */
+ size_t data_size;
+
+ /**
+ * Type of the reply.
+ */
+ enum GNUNET_BLOCK_Type type;
+
+};
+
+
+/**
+ * Forward the result to the given peer if it matches the request.
+ *
+ * @param cls the 'struct ProcessContext' with the result
+ * @param key the query
+ * @param value the 'struct RecentRequest' with the request
+ * @return GNUNET_OK (continue to iterate),
+ * GNUNET_SYSERR if the result is malformed or type unsupported
+ */
+static int
+process (void *cls, const GNUNET_HashCode * key, void *value)
+{
+ struct ProcessContext *pc = cls;
+ struct RecentRequest *rr = value;
+ enum GNUNET_BLOCK_EvaluationResult eval;
+ unsigned int gpl;
+ unsigned int ppl;
+ GNUNET_HashCode hc;
+ const GNUNET_HashCode *eval_key;
+
+ if ((rr->type != GNUNET_BLOCK_TYPE_ANY) && (rr->type != pc->type))
+ return GNUNET_OK; /* type missmatch */
+
+ if (0 != (rr->options & GNUNET_DHT_RO_RECORD_ROUTE))
+ {
+ gpl = pc->get_path_length;
+ ppl = pc->put_path_length;
+ }
+ else
+ {
+ gpl = 0;
+ ppl = 0;
+ }
+ if ((0 != (rr->options & GNUNET_DHT_RO_FIND_PEER)) &&
+ (pc->type == GNUNET_BLOCK_TYPE_DHT_HELLO))
+ {
+ /* key may not match HELLO, which is OK since
+ * the search is approximate. Still, the evaluation
+ * would fail since the match is not exact. So
+ * we fake it by changing the key to the actual PID ... */
+ GNUNET_BLOCK_get_key (GDS_block_context, GNUNET_BLOCK_TYPE_DHT_HELLO,
+ pc->data, pc->data_size, &hc);
+ eval_key = &hc;
+ }
+ else
+ {
+ eval_key = key;
+ }
+ eval =
+ GNUNET_BLOCK_evaluate (GDS_block_context, pc->type, eval_key,
+ &rr->reply_bf, rr->reply_bf_mutator, rr->xquery,
+ rr->xquery_size, pc->data, pc->data_size);
+ switch (eval)
+ {
+ case GNUNET_BLOCK_EVALUATION_OK_MORE:
+ case GNUNET_BLOCK_EVALUATION_OK_LAST:
+ GNUNET_STATISTICS_update (GDS_stats,
+ gettext_noop
+ ("# Good REPLIES matched against routing table"),
+ 1, GNUNET_NO);
+ GDS_NEIGHBOURS_handle_reply (&rr->peer, pc->type, pc->expiration_time, key,
+ ppl, pc->put_path, gpl, pc->get_path, pc->data,
+ pc->data_size);
+ break;
+ case GNUNET_BLOCK_EVALUATION_OK_DUPLICATE:
+ GNUNET_STATISTICS_update (GDS_stats,
+ gettext_noop
+ ("# Duplicate REPLIES matched against routing table"),
+ 1, GNUNET_NO);
+ return GNUNET_OK;
+ case GNUNET_BLOCK_EVALUATION_RESULT_INVALID:
+ GNUNET_STATISTICS_update (GDS_stats,
+ gettext_noop
+ ("# Invalid REPLIES matched against routing table"),
+ 1, GNUNET_NO);
+ return GNUNET_SYSERR;
+ case GNUNET_BLOCK_EVALUATION_REQUEST_VALID:
+ case GNUNET_BLOCK_EVALUATION_REQUEST_INVALID:
+ GNUNET_break (0);
+ return GNUNET_OK;
+ case GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED:
+ GNUNET_STATISTICS_update (GDS_stats,
+ gettext_noop
+ ("# Unsupported REPLIES matched against routing table"),
+ 1, GNUNET_NO);
+ return GNUNET_SYSERR;
+ default:
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Handle a reply (route to origin). Only forwards the reply back to
+ * other peers waiting for it. Does not do local caching or
+ * forwarding to local clients. Essentially calls
+ * GDS_NEIGHBOURS_handle_reply for all peers that sent us a matching
+ * request recently.
+ *
+ * @param type type of the block
+ * @param expiration_time when does the content expire
+ * @param key key for the content
+ * @param put_path_length number of entries in put_path
+ * @param put_path peers the original PUT traversed (if tracked)
+ * @param get_path_length number of entries in put_path
+ * @param get_path peers this reply has traversed so far (if tracked)
+ * @param data payload of the reply
+ * @param data_size number of bytes in data
+ */
+void
+GDS_ROUTING_process (enum GNUNET_BLOCK_Type type,
+ struct GNUNET_TIME_Absolute expiration_time,
+ const GNUNET_HashCode * key, unsigned int put_path_length,
+ const struct GNUNET_PeerIdentity *put_path,
+ unsigned int get_path_length,
+ const struct GNUNET_PeerIdentity *get_path,
+ const void *data, size_t data_size)
+{
+ struct ProcessContext pc;
+
+ pc.type = type;
+ pc.expiration_time = expiration_time;
+ pc.put_path_length = put_path_length;
+ pc.put_path = put_path;
+ pc.get_path_length = get_path_length;
+ pc.get_path = get_path;
+ pc.data = data;
+ pc.data_size = data_size;
+ GNUNET_CONTAINER_multihashmap_get_multiple (recent_map, key, &process, &pc);
+}
+
+
+/**
+ * Add a new entry to our routing table.
+ *
+ * @param sender peer that originated the request
+ * @param type type of the block
+ * @param options options for processing
+ * @param key key for the content
+ * @param xquery extended query
+ * @param xquery_size number of bytes in xquery
+ * @param reply_bf bloomfilter to filter duplicates
+ * @param reply_bf_mutator mutator for reply_bf
+*/
+void
+GDS_ROUTING_add (const struct GNUNET_PeerIdentity *sender,
+ enum GNUNET_BLOCK_Type type,
+ enum GNUNET_DHT_RouteOption options,
+ const GNUNET_HashCode * key, const void *xquery,
+ size_t xquery_size,
+ const struct GNUNET_CONTAINER_BloomFilter *reply_bf,
+ uint32_t reply_bf_mutator)
+{
+ struct RecentRequest *recent_req;
+
+ while (GNUNET_CONTAINER_heap_get_size (recent_heap) >= DHT_MAX_RECENT)
+ {
+ GNUNET_STATISTICS_update (GDS_stats,
+ gettext_noop
+ ("# Entries removed from routing table"), 1,
+ GNUNET_NO);
+ recent_req = GNUNET_CONTAINER_heap_peek (recent_heap);
+ GNUNET_assert (recent_req != NULL);
+ GNUNET_CONTAINER_heap_remove_node (recent_req->heap_node);
+ GNUNET_CONTAINER_bloomfilter_free (recent_req->reply_bf);
+ GNUNET_free (recent_req);
+ }
+
+ GNUNET_STATISTICS_update (GDS_stats,
+ gettext_noop ("# Entries added to routing table"),
+ 1, GNUNET_NO);
+ recent_req = GNUNET_malloc (sizeof (struct RecentRequest) + xquery_size);
+ recent_req->peer = *sender;
+ recent_req->key = *key;
+ recent_req->heap_node =
+ GNUNET_CONTAINER_heap_insert (recent_heap, recent_req,
+ GNUNET_TIME_absolute_get ().abs_value);
+ recent_req->reply_bf = GNUNET_CONTAINER_bloomfilter_copy (reply_bf);
+ recent_req->type = type;
+ recent_req->options = options;
+ recent_req->xquery = &recent_req[1];
+ recent_req->xquery_size = xquery_size;
+ recent_req->reply_bf_mutator = reply_bf_mutator;
+ GNUNET_CONTAINER_multihashmap_put (recent_map, key, recent_req,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
+
+
+}
+
+
+/**
+ * Initialize routing subsystem.
+ */
+void
+GDS_ROUTING_init ()
+{
+ recent_heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
+ recent_map = GNUNET_CONTAINER_multihashmap_create (DHT_MAX_RECENT * 4 / 3);
+}
+
+
+/**
+ * Shutdown routing subsystem.
+ */
+void
+GDS_ROUTING_done ()
+{
+ struct RecentRequest *recent_req;
+
+ while (GNUNET_CONTAINER_heap_get_size (recent_heap) > 0)
+ {
+ GNUNET_STATISTICS_update (GDS_stats,
+ gettext_noop
+ ("# Entries removed from routing table"), 1,
+ GNUNET_NO);
+ recent_req = GNUNET_CONTAINER_heap_peek (recent_heap);
+ GNUNET_assert (recent_req != NULL);
+ GNUNET_CONTAINER_heap_remove_node (recent_req->heap_node);
+ GNUNET_CONTAINER_bloomfilter_free (recent_req->reply_bf);
+ GNUNET_free (recent_req);
+ }
+ GNUNET_assert (0 == GNUNET_CONTAINER_heap_get_size (recent_heap));
+ GNUNET_CONTAINER_heap_destroy (recent_heap);
+ recent_heap = NULL;
+ GNUNET_CONTAINER_multihashmap_destroy (recent_map);
+ recent_map = NULL;
+}
+
+/* end of gnunet-service-dht_routing.c */
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-21 13:40:31 +0000