*
* TODO:
* Implement next:
- * - properly encrypt *all* DV traffic, not only backchannel;
- * rename BackchannelEncapsulation logic to DVEncapsulation!
- * - realize transport-to-transport flow control (needed in case
- * communicators do not offer flow control). Note that we may not
- * want to simply delay the ACKs as that may cause unnecessary
- * re-transmissions. => Introduce proper flow and congestion window(s)!
+ * - FIXME-FC: realize transport-to-transport flow control (needed in case
+ * communicators do not offer flow control).
+ * We do transmit FC window sizes now. Left:
+ * for SENDING)
+ * - Increment "outbound_fc_window_size_used" on transmission
+ * - Throttle sending if "outbound_fc_window_size_used" reaches limit
+ * - Send *new* challenge when we get close to the limit (including
+ * at the beginning when the limit is zero!)
+ * - Retransmit challenge if it goes unanswered!
+ *
+ * for DV)
+ * - send challenges via DV (when DVH is confirmed *and* we care about
+ * the target to get window size, or when DVH is unconfirmed (passive
+ * learning!) to confirm it!)
+ * - handle challenge responses in this case (note: validity period of addresses
+ * will be zero!)
+ * - if available, try to use DV paths when trying to establish
+ * virtual link for a `struct IncomingRequest`. (i.e. if DVH is
+ * unconfirmed, incoming requests also trigger challenge-via-DV!)
+ *
* - review retransmission logic, right now there is no smartness there!
- * => congestion control, flow control, etc [PERFORMANCE-BASICS]
+ * => congestion control, etc [PERFORMANCE-BASICS]
*
* Optimizations:
* - When forwarding DV learn messages, if a peer is reached that
* whatever else we could reach.
* - AcknowledgementUUIDPs are overkill with 256 bits (128 would do)
* => Need 128 bit hash map though! [BANDWIDTH, MEMORY]
- * - queue_send_msg and route_message both by API design have to make copies
+ * - queue_send_msg by API design has to make a copy
* of the payload, and route_message on top of that requires a malloc/free.
* Change design to approximate "zero" copy better... [CPU]
* - could avoid copying body of message into each fragment and keep
* triggering an explicit validation mechansim ourselves, specifically routing
* a challenge-response message over the path [ROUTING]
* - Track ACK losses based on ACK-counter [ROUTING]
+ * - Fragments send over a reliable channel could do without the
+ * AcknowledgementUUIDP altogether, as they won't be acked! [BANDWIDTH]
+ * (-> have 2nd type of acknowledgment message; low priority, as we
+ * do not have an MTU-limited *reliable* communicator)
+ * - Adapt available_fc_window_size, using larger values for high-bandwidth
+ * and high-latency links *if* we have the RAM [GOODPUT / utilization / stalls]
+ * - Set last_window_consum_limit promise properly based on
+ * latency and bandwidth of the respective connection [GOODPUT / utilization / stalls]
+ * - re-sending challenge response without a challenge when we have
+ * significantly increased the FC window (upon CORE being done with messages)
+ * so as to avoid the sender having to give us a fresh challenge [BANDWIDTH]
+ * Also can re-use signature in this case [CPU]. Marked with "TODO-M1"
*
* Design realizations / discussion:
* - communicators do flow control by calling MQ "notify sent"
*/
#define GOODPUT_AGING_SLOTS 4
+/**
+ * How big is the flow control window size by default;
+ * limits per-neighbour RAM utilization.
+ */
+#define DEFAULT_WINDOW_SIZE (128 * 1024)
+
+/**
+ * For how many incoming connections do we try to create a
+ * virtual link for (at the same time!). This does NOT
+ * limit the number of incoming connections, just the number
+ * for which we are actively trying to find working addresses
+ * in the absence (!) of our own applications wanting the
+ * link to go up.
+ */
+#define MAX_INCOMING_REQUEST 16
+
/**
* Maximum number of peers we select for forwarding DVInit
* messages at the same time (excluding initiator).
*/
struct GNUNET_MessageHeader header;
- /**
- * Reserved, always zero.
- */
- uint32_t reserved GNUNET_PACKED;
-
- /**
- * Target's peer identity (as backchannels may be transmitted
- * indirectly, or even be broadcast).
- */
- struct GNUNET_PeerIdentity target;
-
- /**
- * Ephemeral key setup by the sender for @e target, used
- * to encrypt the payload.
- */
- struct GNUNET_CRYPTO_EcdhePublicKey ephemeral_key;
-
- /**
- * We use an IV here as the @e ephemeral_key is re-used for
- * #EPHEMERAL_VALIDITY time to avoid re-signing it all the time.
- */
- struct GNUNET_ShortHashCode iv;
-
- /**
- * HMAC over the ciphertext of the encrypted, variable-size
- * body that follows. Verified via DH of @e target and
- * @e ephemeral_key
- */
- struct GNUNET_HashCode hmac;
+ /* Followed by *another* message header which is the message to
+ the communicator */
- /* Followed by encrypted, variable-size payload */
+ /* Followed by a 0-terminated name of the communicator */
};
* Plaintext of the variable-size payload that is encrypted
* within a `struct TransportBackchannelEncapsulationMessage`
*/
-struct TransportBackchannelRequestPayloadP
+struct TransportDVBoxPayloadP
{
/**
struct GNUNET_TIME_AbsoluteNBO monotonic_time;
/* Followed by a `struct GNUNET_MessageHeader` with a message
- for a communicator */
-
- /* Followed by a 0-termianted string specifying the name of
- the communicator which is to receive the message */
+ for the target peer */
};
* shortcut.
*
* If a peer finds itself still on the list, it must drop the message.
+ *
+ * The payload of the box can only be decrypted and verified by the
+ * ultimate receiver. Intermediaries do not learn the sender's
+ * identity and the path the message has taken. However, the first
+ * hop does learn the sender as @e total_hops would be zero and thus
+ * the predecessor must be the origin (so this is not really useful
+ * for anonymization).
*/
struct TransportDVBoxMessage
{
/**
* Number of total hops this messages travelled. In NBO.
* @e origin sets this to zero, to be incremented at
- * each hop.
+ * each hop. Peers should limit the @e total_hops value
+ * they accept from other peers.
*/
uint16_t total_hops GNUNET_PACKED;
/**
- * Number of hops this messages includes. In NBO.
+ * Number of hops this messages includes. In NBO. Reduced by one
+ * or more at each hop. Peers should limit the @e num_hops value
+ * they accept from other peers.
*/
uint16_t num_hops GNUNET_PACKED;
/**
- * Identity of the peer that originated the message.
+ * Ephemeral key setup by the sender for target, used to encrypt the
+ * payload. Intermediaries must not change this value.
*/
- struct GNUNET_PeerIdentity origin;
+ struct GNUNET_CRYPTO_EcdhePublicKey ephemeral_key;
+
+ /**
+ * We use an IV here as the @e ephemeral_key is re-used for
+ * #EPHEMERAL_VALIDITY time to avoid re-signing it all the time.
+ * Intermediaries must not change this value.
+ */
+ struct GNUNET_ShortHashCode iv;
+
+ /**
+ * HMAC over the ciphertext of the encrypted, variable-size body
+ * that follows. Verified via DH of target and @e ephemeral_key.
+ * Intermediaries must not change this value.
+ */
+ struct GNUNET_HashCode hmac;
/* Followed by @e num_hops `struct GNUNET_PeerIdentity` values;
excluding the @e origin and the current peer, the last must be
the ultimate target; if @e num_hops is zero, the receiver of this
message is the ultimate target. */
- /* Followed by the actual message, which itself may be
- another box, but not a DV_LEARN or DV_BOX message! */
+ /* Followed by encrypted, variable-size payload, which
+ must begin with a `struct TransportDVBoxPayloadP` */
+
+ /* Followed by the actual message, which itself must not be a
+ a DV_LEARN or DV_BOX message! */
};
struct GNUNET_MessageHeader header;
/**
- * Zero.
+ * Always zero.
*/
uint32_t reserved GNUNET_PACKED;
struct ChallengeNonceP challenge;
/**
- * Timestamp of the sender, to be copied into the reply
- * to allow sender to calculate RTT.
+ * Timestamp of the sender, to be copied into the reply to allow
+ * sender to calculate RTT. Must be monotonically increasing!
*/
struct GNUNET_TIME_AbsoluteNBO sender_time;
};
/**
- * Message send to a peer to respond to a
+ * Message send to a peer to respond to a
* #GNUNET_MESSAGE_TYPE_ADDRESS_VALIDATION_CHALLENGE
*/
struct TransportValidationResponseMessage
struct GNUNET_MessageHeader header;
/**
- * Zero.
+ * Always zero.
*/
uint32_t reserved GNUNET_PACKED;
};
+/**
+ * Message for Transport-to-Transport Flow control. Specifies the size
+ * of the flow control window, including how much we believe to have
+ * consumed (at transmission time), how much we believe to be allowed
+ * (at transmission time), and how much the other peer is allowed to
+ * send to us, and how much data we already received from the other
+ * peer.
+ */
+struct TransportFlowControlMessage
+{
+ /**
+ * Type is #GNUNET_MESSAGE_TYPE_TRANSPORT_FLOW_CONTROL
+ */
+ struct GNUNET_MessageHeader header;
+
+ /**
+ * Sequence number of the flow control message. Incremented by one
+ * for each message. Starts at zero when a virtual link goes up.
+ * Used to detect one-sided connection drops. On wrap-around, the
+ * flow control counters will be reset as if the connection had
+ * dropped.
+ */
+ uint32_t seq GNUNET_PACKED;
+
+ /**
+ * Flow control window size in bytes, in NBO.
+ * The receiver can send this many bytes at most.
+ */
+ uint64_t inbound_window_size GNUNET_PACKED;
+
+ /**
+ * How many bytes has the sender sent that count for flow control at
+ * this time. Used to allow the receiver to estimate the packet
+ * loss rate.
+ */
+ uint64_t outbound_sent GNUNET_PACKED;
+
+ /**
+ * Latest flow control window size we learned from the other peer,
+ * in bytes, in NBO. We are limited to sending at most this many
+ * bytes to the other peer. May help the other peer detect when
+ * flow control messages were lost and should thus be retransmitted.
+ * In particular, if the delta to @e outbound_sent is too small,
+ * this signals that we are stalled.
+ */
+ uint64_t outbound_window_size GNUNET_PACKED;
+
+ /**
+ * Timestamp of the sender. Must be monotonically increasing!
+ * Used to enable receiver to ignore out-of-order packets in
+ * combination with the @e seq. Note that @e seq will go down
+ * (back to zero) whenever either side believes the connection
+ * was dropped, allowing the peers to detect that they need to
+ * reset the counters for the number of bytes sent!
+ */
+ struct GNUNET_TIME_AbsoluteNBO sender_time;
+
+};
+
+
GNUNET_NETWORK_STRUCT_END
};
-/**
- * Entry in our cache of ephemeral keys we currently use. This way, we only
- * sign an ephemeral once per @e target, and then can re-use it over multiple
- * #GNUNET_MESSAGE_TYPE_TRANSPORT_BACKCHANNEL_ENCAPSULATION messages (as
- * signing is expensive and in some cases we may use backchannel messages a
- * lot).
- */
-struct EphemeralCacheEntry
-{
-
- /**
- * Target's peer identity (we don't re-use ephemerals
- * to limit linkability of messages).
- */
- struct GNUNET_PeerIdentity target;
-
- /**
- * Signature affirming @e ephemeral_key of type
- * #GNUNET_SIGNATURE_PURPOSE_TRANSPORT_EPHEMERAL
- */
- struct GNUNET_CRYPTO_EddsaSignature sender_sig;
-
- /**
- * How long is @e sender_sig valid
- */
- struct GNUNET_TIME_Absolute ephemeral_validity;
-
- /**
- * What time was @e sender_sig created
- */
- struct GNUNET_TIME_Absolute monotime;
-
- /**
- * Our ephemeral key.
- */
- struct GNUNET_CRYPTO_EcdhePublicKey ephemeral_key;
-
- /**
- * Our private ephemeral key.
- */
- struct GNUNET_CRYPTO_EcdhePrivateKey private_key;
-
- /**
- * Node in the ephemeral cache for this entry.
- * Used for expiration.
- */
- struct GNUNET_CONTAINER_HeapNode *hn;
-};
-
-
/**
* Information we keep per #GOODPUT_AGING_SLOTS about historic
* (or current) transmission performance.
*/
struct DistanceVectorHop;
+/**
+ * A virtual link is another reachable peer that is known to CORE. It
+ * can be either a `struct Neighbour` with at least one confirmed
+ * `struct Queue`, or a `struct DistanceVector` with at least one
+ * confirmed `struct DistanceVectorHop`. With a virtual link we track
+ * data that is per neighbour that is not specific to how the
+ * connectivity is established.
+ */
+struct VirtualLink;
+
/**
* Context from #handle_incoming_msg(). Closure for many
};
+/**
+ * Closure for #core_env_sent_cb.
+ */
+struct CoreSentContext
+{
+
+ /**
+ * Kept in a DLL to clear @e vl in case @e vl is lost.
+ */
+ struct CoreSentContext *next;
+
+ /**
+ * Kept in a DLL to clear @e vl in case @e vl is lost.
+ */
+ struct CoreSentContext *prev;
+
+ /**
+ * Virtual link this is about.
+ */
+ struct VirtualLink *vl;
+
+ /**
+ * How big was the message.
+ */
+ uint16_t size;
+
+ /**
+ * By how much should we increment @e vl's
+ * incoming_fc_window_size_used once we are done sending to CORE?
+ * Use to ensure we do not increment twice if there is more than one
+ * CORE client.
+ */
+ uint16_t isize;
+};
+
+
/**
* A virtual link is another reachable peer that is known to CORE. It
* can be either a `struct Neighbour` with at least one confirmed
*/
struct CommunicatorMessageContext *cmc_tail;
+ /**
+ * Head of list of messages pending for this VL.
+ */
+ struct PendingMessage *pending_msg_head;
+
+ /**
+ * Tail of list of messages pending for this VL.
+ */
+ struct PendingMessage *pending_msg_tail;
+
+ /**
+ * Kept in a DLL to clear @e vl in case @e vl is lost.
+ */
+ struct CoreSentContext *csc_tail;
+
+ /**
+ * Kept in a DLL to clear @e vl in case @e vl is lost.
+ */
+ struct CoreSentContext *csc_head;
+
/**
* Task scheduled to possibly notfiy core that this peer is no
* longer counting as confirmed. Runs the #core_visibility_check(),
* Distance vector used by this virtual link, NULL if @e n is used.
*/
struct DistanceVector *dv;
+
+ /**
+ * Last challenge we received from @a n.
+ * FIXME: where do we need this?
+ */
+ struct ChallengeNonceP n_challenge;
+
+ /**
+ * Last challenge we used with @a n for flow control.
+ * FIXME: where do we need this?
+ */
+ struct ChallengeNonceP my_challenge;
+
+ /**
+ * Sender timestamp of @e n_challenge, used to generate out-of-order
+ * challenges (as sender's timestamps must be monotonically
+ * increasing). FIXME: where do we need this?
+ */
+ struct GNUNET_TIME_Absolute n_challenge_time;
+
+ /**
+ * Sender timestamp of the last
+ * #GNUNET_MESSAGE_TYPE_TRANSPORT_FLOW_CONTROL message we have
+ * received. Note that we do not persist this monotonic time as we
+ * do not really have to worry about ancient flow control window
+ * sizes after restarts.
+ */
+ struct GNUNET_TIME_Absolute last_fc_timestamp;
+
+ /**
+ * Used to generate unique UUIDs for messages that are being
+ * fragmented.
+ */
+ uint64_t message_uuid_ctr;
+
+ /**
+ * Memory allocated for this virtual link. Expresses how much RAM
+ * we are willing to allocate to this virtual link. OPTIMIZE-ME:
+ * Can be adapted to dedicate more RAM to links that need it, while
+ * sticking to some overall RAM limit. For now, set to
+ * #DEFAULT_WINDOW_SIZE.
+ */
+ uint64_t available_fc_window_size;
+
+ /**
+ * Memory actually used to buffer packets on this virtual link.
+ * Expresses how much RAM we are currently using for virtual link.
+ * Note that once CORE is done with a packet, we decrement the value
+ * here.
+ */
+ uint64_t incoming_fc_window_size_ram;
+
+ /**
+ * Last flow control window size we provided to the other peer, in
+ * bytes. We are allowing the other peer to send this
+ * many bytes.
+ */
+ uint64_t incoming_fc_window_size;
+
+ /**
+ * How much of the window did the other peer successfully use (and
+ * we already passed it on to CORE)? Must be below @e
+ * incoming_fc_window_size. We should effectively signal the
+ * other peer that the window is this much bigger at the next
+ * opportunity / challenge.
+ */
+ uint64_t incoming_fc_window_size_used;
+
+ /**
+ * What is our current estimate on the message loss rate for the sender?
+ * Based on the difference between how much the sender sent according
+ * to the last #GNUNET_MESSAGE_TYPE_TRANSPORT_FLOW_CONTROL message
+ * (@e outbound_sent field) and how much we actually received at that
+ * time (@e incoming_fc_window_size_used). This delta is then
+ * added onto the @e incoming_fc_window_size when determining the
+ * @e outbound_window_size we send to the other peer. Initially zero.
+ * May be negative if we (due to out-of-order delivery) actually received
+ * more than the sender claims to have sent in its last FC message.
+ */
+ int64_t incoming_fc_window_size_loss;
+
+ /**
+ * Our current flow control window size in bytes. We
+ * are allowed to transmit this many bytes to @a n as per
+ * our @e my_challenge "account".
+ */
+ uint64_t outbound_fc_window_size;
+
+ /**
+ * How much of our current flow control window size have we
+ * used (in bytes). Must be below
+ * @e outbound_fc_window_size.
+ */
+ uint64_t outbound_fc_window_size_used;
/**
- * How many more messages can we send to core before we exhaust
+ * Generator for the sequence numbers of
+ * #GNUNET_MESSAGE_TYPE_TRANSPORT_FLOW_CONTROL messages we send.
+ */
+ uint32_t fc_seq_gen;
+
+ /**
+ * Last sequence number of a
+ * #GNUNET_MESSAGE_TYPE_TRANSPORT_FLOW_CONTROL message we have
+ * received.
+ */
+ uint32_t last_fc_seq;
+
+ /**
+ * How many more messages can we send to CORE before we exhaust
* the receive window of CORE for this peer? If this hits zero,
* we must tell communicators to stop providing us more messages
* for this peer. In fact, the window can go negative as we
* have multiple communicators, so per communicator we can go
- * down by one into the negative range.
+ * down by one into the negative range. Furthermore, we count
+ * delivery per CORE client, so if we had multiple cores, that
+ * might also cause a negative window size here (as one message
+ * would decrement the window by one per CORE client).
*/
int core_recv_window;
};
*/
struct DistanceVectorHop *prev_neighbour;
- /**
- * Head of MDLL of messages routed via this path.
- */
- struct PendingMessage *pending_msg_head;
-
- /**
- * Tail of MDLL of messages routed via this path.
- */
- struct PendingMessage *pending_msg_tail;
-
/**
* Head of DLL of PAs that used our @a path.
*/
* Do we have a confirmed working queue and are thus visible to
* CORE? If so, this is the virtual link, otherwise NULL.
*/
- struct VirtualLink *link;
+ struct VirtualLink *vl;
+
+ /**
+ * Signature affirming @e ephemeral_key of type
+ * #GNUNET_SIGNATURE_PURPOSE_TRANSPORT_EPHEMERAL
+ */
+ struct GNUNET_CRYPTO_EddsaSignature sender_sig;
+
+ /**
+ * How long is @e sender_sig valid
+ */
+ struct GNUNET_TIME_Absolute ephemeral_validity;
+
+ /**
+ * What time was @e sender_sig created
+ */
+ struct GNUNET_TIME_Absolute monotime;
+
+ /**
+ * Our ephemeral key.
+ */
+ struct GNUNET_CRYPTO_EcdhePublicKey ephemeral_key;
+
+ /**
+ * Our private ephemeral key.
+ */
+ struct GNUNET_CRYPTO_EcdhePrivateKey private_key;
};
* Connection status for this queue.
*/
enum GNUNET_TRANSPORT_ConnectionStatus cs;
+
+ /**
+ * Set to #GNUNET_YES if this queue is idle waiting for some
+ * virtual link to give it a pending message.
+ */
+ int idle;
};
*/
struct GNUNET_SCHEDULER_Task *reassembly_timeout_task;
- /**
- * Head of list of messages pending for this neighbour.
- */
- struct PendingMessage *pending_msg_head;
-
- /**
- * Tail of list of messages pending for this neighbour.
- */
- struct PendingMessage *pending_msg_tail;
-
/**
* Head of MDLL of DV hops that have this neighbour as next hop. Must be
* purged if this neighbour goes down.
* Do we have a confirmed working queue and are thus visible to
* CORE? If so, this is the virtual link, otherwise NULL.
*/
- struct VirtualLink *link;
+ struct VirtualLink *vl;
/**
* Latest DVLearn monotonic time seen from this peer. Initialized only
*/
struct GNUNET_TIME_Absolute last_dv_learn_monotime;
- /**
- * Used to generate unique UUIDs for messages that are being
- * fragmented.
- */
- uint64_t message_uuid_ctr;
-
/**
* Do we have the lastest value for @e last_dv_learn_monotime from
* PEERSTORE yet, or are we still waiting for a reply of PEERSTORE?
/**
- * A peer that an application (client) would like us to talk to directly.
+ * Another peer attempted to talk to us, we should try to establish
+ * a connection in the other direction.
*/
-struct PeerRequest
+struct IncomingRequest
{
/**
- * Which peer is this about?
+ * Kept in a DLL.
*/
- struct GNUNET_PeerIdentity pid;
+ struct IncomingRequest *next;
/**
- * Client responsible for the request.
+ * Kept in a DLL.
+ */
+ struct IncomingRequest *prev;
+
+ /**
+ * Handle for watching the peerstore for HELLOs for this peer.
+ */
+ struct GNUNET_PEERSTORE_WatchContext *wc;
+
+ /**
+ * Which peer is this about?
+ */
+ struct GNUNET_PeerIdentity pid;
+};
+
+
+/**
+ * A peer that an application (client) would like us to talk to directly.
+ */
+struct PeerRequest
+{
+
+ /**
+ * Which peer is this about?
+ */
+ struct GNUNET_PeerIdentity pid;
+
+ /**
+ * Client responsible for the request.
*/
struct TransportClient *tc;
/**
* Reliability box.
*/
- PMT_RELIABILITY_BOX = 2,
-
- /**
- * Any type of acknowledgement.
- */
- PMT_ACKNOWLEDGEMENT = 3,
-
- /**
- * Control traffic generated by the TRANSPORT service itself.
- */
- PMT_CONTROL = 4
+ PMT_RELIABILITY_BOX = 2
};
struct PendingMessage
{
/**
- * Kept in a MDLL of messages for this @a target.
+ * Kept in a MDLL of messages for this @a vl.
*/
- struct PendingMessage *next_neighbour;
+ struct PendingMessage *next_vl;
/**
- * Kept in a MDLL of messages for this @a target.
+ * Kept in a MDLL of messages for this @a vl.
*/
- struct PendingMessage *prev_neighbour;
+ struct PendingMessage *prev_vl;
/**
* Kept in a MDLL of messages from this @a client (if @e pmt is #PMT_CORE)
*/
struct PendingMessage *prev_frag;
- /**
- * Kept in a MDLL of messages using this @a dvh (if @e dvh is
- * non-NULL).
- */
- struct PendingMessage *next_dvh;
-
- /**
- * Kept in a MDLL of messages using this @a dvh (if @e dvh is
- * non-NULL).
- */
- struct PendingMessage *prev_dvh;
-
/**
* Head of DLL of PAs for this pending message.
*/
struct PendingMessage *bpm;
/**
- * Target of the request (for transmission, may not be ultimate
- * destination!).
+ * Target of the request (always the ultimate destination!).
*/
- struct Neighbour *target;
-
- /**
- * Distance vector path selected for this message, or
- * NULL if transmitted directly.
- */
- struct DistanceVectorHop *dvh;
+ struct VirtualLink *vl;
/**
* Set to non-NULL value if this message is currently being given to a
*/
struct GNUNET_PEERSTORE_StoreContext *sc;
+ /**
+ * Self-imposed limit on the previous flow control window. (May be zero,
+ * if we never used data from the previous window or are establishing the
+ * connection for the first time).
+ */
+ uint32_t last_window_consum_limit;
+
/**
* We are technically ready to send the challenge, but we are waiting for
* the respective queue to become available for transmission.
*/
static struct GNUNET_PEERSTORE_Handle *peerstore;
-/**
- * Heap sorting `struct EphemeralCacheEntry` by their
- * key/signature validity.
- */
-static struct GNUNET_CONTAINER_Heap *ephemeral_heap;
-
-/**
- * Hash map for looking up `struct EphemeralCacheEntry`s
- * by peer identity. (We may have ephemerals in our
- * cache for which we do not have a neighbour entry,
- * and similar many neighbours may not need ephemerals,
- * so we use a second map.)
- */
-static struct GNUNET_CONTAINER_MultiPeerMap *ephemeral_map;
-
-/**
- * Task to free expired ephemerals.
- */
-static struct GNUNET_SCHEDULER_Task *ephemeral_task;
-
/**
* Task run to initiate DV learning.
*/
*/
static struct PendingAcknowledgement *pa_tail;
+/**
+ * List of incomming connections where we are trying
+ * to get a connection back established. Length
+ * kept in #ir_total.
+ */
+static struct IncomingRequest *ir_head;
+
+/**
+ * Tail of DLL starting at #ir_head.
+ */
+static struct IncomingRequest *ir_tail;
+
+/**
+ * Length of the DLL starting at #ir_head.
+ */
+static unsigned int ir_total;
+
/**
* Generator of `logging_uuid` in `struct PendingMessage`.
*/
}
+/**
+ * Release @a ir data structure.
+ *
+ * @param ir data structure to release
+ */
+static void
+free_incoming_request (struct IncomingRequest *ir)
+{
+ GNUNET_CONTAINER_DLL_remove (ir_head, ir_tail, ir);
+ GNUNET_assert (ir_total > 0);
+ ir_total--;
+ GNUNET_PEERSTORE_watch_cancel (ir->wc);
+ GNUNET_free (ir);
+}
+
+
/**
* Release @a pa data structure.
*
/**
- * Free cached ephemeral key.
+ * Free fragment tree below @e root, excluding @e root itself.
+ * FIXME: this does NOT seem to have the intended semantics
+ * based on how this is called. Seems we generally DO expect
+ * @a root to be free'ed itself as well!
+ *
+ * @param root root of the tree to free
+ */
+static void
+free_fragment_tree (struct PendingMessage *root)
+{
+ struct PendingMessage *frag;
+
+ while (NULL != (frag = root->head_frag))
+ {
+ struct PendingAcknowledgement *pa;
+
+ free_fragment_tree (frag);
+ while (NULL != (pa = frag->pa_head))
+ {
+ GNUNET_CONTAINER_MDLL_remove (pm, frag->pa_head, frag->pa_tail, pa);
+ pa->pm = NULL;
+ }
+ GNUNET_CONTAINER_MDLL_remove (frag, root->head_frag, root->tail_frag, frag);
+ GNUNET_free (frag);
+ }
+}
+
+
+/**
+ * Release memory associated with @a pm and remove @a pm from associated
+ * data structures. @a pm must be a top-level pending message and not
+ * a fragment in the tree. The entire tree is freed (if applicable).
*
- * @param ece cached signature to free
+ * @param pm the pending message to free
*/
static void
-free_ephemeral (struct EphemeralCacheEntry *ece)
+free_pending_message (struct PendingMessage *pm)
{
- GNUNET_CONTAINER_multipeermap_remove (ephemeral_map, &ece->target, ece);
- GNUNET_CONTAINER_heap_remove_node (ece->hn);
- GNUNET_free (ece);
+ struct TransportClient *tc = pm->client;
+ struct VirtualLink *vl = pm->vl;
+ struct PendingAcknowledgement *pa;
+
+ if (NULL != tc)
+ {
+ GNUNET_CONTAINER_MDLL_remove (client,
+ tc->details.core.pending_msg_head,
+ tc->details.core.pending_msg_tail,
+ pm);
+ }
+ if (NULL != vl)
+ {
+ GNUNET_CONTAINER_MDLL_remove (vl,
+ vl->pending_msg_head,
+ vl->pending_msg_tail,
+ pm);
+ }
+ while (NULL != (pa = pm->pa_head))
+ {
+ GNUNET_CONTAINER_MDLL_remove (pm, pm->pa_head, pm->pa_tail, pa);
+ pa->pm = NULL;
+ }
+
+ free_fragment_tree (pm);
+ if (NULL != pm->qe)
+ {
+ GNUNET_assert (pm == pm->qe->pm);
+ pm->qe->pm = NULL;
+ }
+ GNUNET_free_non_null (pm->bpm);
+ GNUNET_free (pm);
}
static void
free_virtual_link (struct VirtualLink *vl)
{
+ struct PendingMessage *pm;
+ struct CoreSentContext *csc;
+
+ while (NULL != (pm = vl->pending_msg_head))
+ free_pending_message (pm);
GNUNET_CONTAINER_multipeermap_remove (links, &vl->target, vl);
if (NULL != vl->visibility_task)
{
GNUNET_SCHEDULER_cancel (vl->visibility_task);
vl->visibility_task = NULL;
}
+ while (NULL != (csc = vl->csc_head))
+ {
+ GNUNET_CONTAINER_DLL_remove (vl->csc_head, vl->csc_tail, csc);
+ GNUNET_assert (vl == csc->vl);
+ csc->vl = NULL;
+ }
GNUNET_break (NULL == vl->n);
GNUNET_break (NULL == vl->dv);
GNUNET_free (vl);
/**
- * Lookup neighbour record for peer @a pid.
+ * Lookup neighbour for peer @a pid.
*
* @param pid neighbour to look for
* @return NULL if we do not have this peer as a neighbour
}
+/**
+ * Lookup virtual link for peer @a pid.
+ *
+ * @param pid virtual link to look for
+ * @return NULL if we do not have this peer as a virtual link
+ */
+static struct VirtualLink *
+lookup_virtual_link (const struct GNUNET_PeerIdentity *pid)
+{
+ return GNUNET_CONTAINER_multipeermap_get (links, pid);
+}
+
+
/**
* Details about what to notify monitors about.
*/
struct Neighbour *n = dvh->next_hop;
struct DistanceVector *dv = dvh->dv;
struct PendingAcknowledgement *pa;
- struct PendingMessage *pm;
- while (NULL != (pm = dvh->pending_msg_head))
- {
- GNUNET_CONTAINER_MDLL_remove (dvh,
- dvh->pending_msg_head,
- dvh->pending_msg_tail,
- pm);
- pm->dvh = NULL;
- }
while (NULL != (pa = dvh->pa_head))
{
GNUNET_CONTAINER_MDLL_remove (dvh, dvh->pa_head, dvh->pa_tail, pa);
}
+/**
+ * Task run to check whether the hops of the @a cls still
+ * are validated, or if we need to core about disconnection.
+ *
+ * @param cls a `struct VirtualLink`
+ */
+static void
+check_link_down (void *cls);
+
+
+/**
+ * Send message to CORE clients that we lost a connection.
+ *
+ * @param pid peer the connection was for
+ */
+static void
+cores_send_disconnect_info (const struct GNUNET_PeerIdentity *pid)
+{
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Informing CORE clients about disconnect from %s\n",
+ GNUNET_i2s (pid));
+ for (struct TransportClient *tc = clients_head; NULL != tc; tc = tc->next)
+ {
+ struct GNUNET_MQ_Envelope *env;
+ struct DisconnectInfoMessage *dim;
+
+ if (CT_CORE != tc->type)
+ continue;
+ env = GNUNET_MQ_msg (dim, GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
+ dim->peer = *pid;
+ GNUNET_MQ_send (tc->mq, env);
+ }
+}
+
+
/**
* Free entry in #dv_routes. First frees all hops to the target, and
* if there are no entries left, frees @a dv as well.
free_distance_vector_hop (dvh);
if (NULL == dv->dv_head)
{
+ struct VirtualLink *vl;
+
GNUNET_assert (
GNUNET_YES ==
GNUNET_CONTAINER_multipeermap_remove (dv_routes, &dv->target, dv));
+ if (NULL != (vl = dv->vl))
+ {
+ GNUNET_assert (dv == vl->dv);
+ vl->dv = NULL;
+ if (NULL == vl->n)
+ {
+ cores_send_disconnect_info (&dv->target);
+ free_virtual_link (vl);
+ }
+ else
+ {
+ GNUNET_SCHEDULER_cancel (vl->visibility_task);
+ vl->visibility_task = GNUNET_SCHEDULER_add_now (&check_link_down, vl);
+ }
+ dv->vl = NULL;
+ }
+
if (NULL != dv->timeout_task)
+ {
GNUNET_SCHEDULER_cancel (dv->timeout_task);
+ dv->timeout_task = NULL;
+ }
GNUNET_free (dv);
}
}
free_neighbour (struct Neighbour *neighbour)
{
struct DistanceVectorHop *dvh;
+ struct VirtualLink *vl;
GNUNET_assert (NULL == neighbour->queue_head);
GNUNET_assert (GNUNET_YES ==
GNUNET_PEERSTORE_store_cancel (neighbour->sc);
neighbour->sc = NULL;
}
+ if (NULL != (vl = neighbour->vl))
+ {
+ GNUNET_assert (neighbour == vl->n);
+ vl->n = NULL;
+ if (NULL == vl->dv)
+ {
+ cores_send_disconnect_info (&vl->target);
+ free_virtual_link (vl);
+ }
+ else
+ {
+ GNUNET_SCHEDULER_cancel (vl->visibility_task);
+ vl->visibility_task = GNUNET_SCHEDULER_add_now (&check_link_down, vl);
+ }
+ neighbour->vl = NULL;
+ }
GNUNET_free (neighbour);
}
}
-/**
- * Send message to CORE clients that we lost a connection.
- *
- * @param pid peer the connection was for
- */
-static void
-cores_send_disconnect_info (const struct GNUNET_PeerIdentity *pid)
-{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Informing CORE clients about disconnect from %s\n",
- GNUNET_i2s (pid));
- for (struct TransportClient *tc = clients_head; NULL != tc; tc = tc->next)
- {
- struct GNUNET_MQ_Envelope *env;
- struct DisconnectInfoMessage *dim;
-
- if (CT_CORE != tc->type)
- continue;
- env = GNUNET_MQ_msg (dim, GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
- dim->peer = *pid;
- GNUNET_MQ_send (tc->mq, env);
- }
-}
-
-
/**
* We believe we are ready to transmit a message on a queue. Gives the
* message to the communicator for transmission (updating the tracker,
/**
- * Schedule next run of #transmit_on_queue(). Does NOTHING if
- * we should run immediately or if the message queue is empty.
- * Test for no task being added AND queue not being empty to
- * transmit immediately afterwards! This function must only
- * be called if the message queue is non-empty!
+ * Called whenever something changed that might effect when we
+ * try to do the next transmission on @a queue using #transmit_on_queue().
*
* @param queue the queue to do scheduling for
- * @param inside_job set to #GNUNET_YES if called from
- * #transmit_on_queue() itself and NOT setting
- * the task means running immediately
+ * @param p task priority to use, if @a queue is scheduled
*/
static void
-schedule_transmit_on_queue (struct Queue *queue, int inside_job)
+schedule_transmit_on_queue (struct Queue *queue,
+ enum GNUNET_SCHEDULER_Priority p)
{
- struct Neighbour *n = queue->neighbour;
- struct PendingMessage *pm = n->pending_msg_head;
- struct GNUNET_TIME_Relative out_delay;
-
- GNUNET_assert (NULL != pm);
if (queue->tc->details.communicator.total_queue_length >=
COMMUNICATOR_TOTAL_QUEUE_LIMIT)
{
"# Transmission throttled due to communicator queue limit",
1,
GNUNET_NO);
+ queue->idle = GNUNET_NO;
return;
}
if (queue->queue_length >= QUEUE_LENGTH_LIMIT)
"# Transmission throttled due to queue queue limit",
1,
GNUNET_NO);
+ queue->idle = GNUNET_NO;
return;
}
-
- out_delay = GNUNET_TIME_absolute_get_remaining (pm->next_attempt);
- if ((GNUNET_YES == inside_job) && (0 == out_delay.rel_value_us))
- {
- GNUNET_log (
- GNUNET_ERROR_TYPE_DEBUG,
- "Schedule transmission <%llu> on queue %llu of %s decides to run immediately\n",
- pm->logging_uuid,
- (unsigned long long) queue->qid,
- GNUNET_i2s (&n->pid));
- return; /* we should run immediately! */
- }
- /* queue has changed since we were scheduled, reschedule again */
+ /* queue might indeed be ready, schedule it */
+ if (NULL != queue->transmit_task)
+ GNUNET_SCHEDULER_cancel (queue->transmit_task);
queue->transmit_task =
- GNUNET_SCHEDULER_add_delayed (out_delay, &transmit_on_queue, queue);
- if (out_delay.rel_value_us > DELAY_WARN_THRESHOLD.rel_value_us)
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "Next transmission <%llu> on queue `%s' in %s (high delay)\n",
- pm->logging_uuid,
- queue->address,
- GNUNET_STRINGS_relative_time_to_string (out_delay, GNUNET_YES));
- else
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Next transmission <%llu> on queue `%s' in %s\n",
- pm->logging_uuid,
- queue->address,
- GNUNET_STRINGS_relative_time_to_string (out_delay, GNUNET_YES));
+ GNUNET_SCHEDULER_add_with_priority (p, &transmit_on_queue, queue);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Considering transmission on queue `%s' to %s\n",
+ queue->address,
+ GNUNET_i2s (&queue->neighbour->pid));
}
pos = pos->next_dv)
dvh_timeout = GNUNET_TIME_absolute_max (dvh_timeout, pos->path_valid_until);
if (0 == GNUNET_TIME_absolute_get_remaining (dvh_timeout).rel_value_us)
+ {
+ vl->dv->vl = NULL;
vl->dv = NULL;
+ }
q_timeout = GNUNET_TIME_UNIT_ZERO_ABS;
for (struct Queue *q = n->queue_head; NULL != q; q = q->next_neighbour)
q_timeout = GNUNET_TIME_absolute_max (q_timeout, q->validated_until);
- if (0 == GNUNET_TIME_absolute_get_remaining (dvh_timeout).rel_value_us)
+ if (0 == GNUNET_TIME_absolute_get_remaining (q_timeout).rel_value_us)
+ {
+ vl->n->vl = NULL;
vl->n = NULL;
+ }
if ((NULL == vl->n) && (NULL == vl->dv))
{
- cores_send_disconnect_info (&dv->target);
+ cores_send_disconnect_info (&vl->target);
free_virtual_link (vl);
return;
}
if ((maxxed) && (COMMUNICATOR_TOTAL_QUEUE_LIMIT <
tc->details.communicator.total_queue_length))
{
- /* Communicator dropped below threshold, resume all queues */
+ /* Communicator dropped below threshold, resume all _other_ queues */
GNUNET_STATISTICS_update (
GST_stats,
"# Transmission throttled due to communicator queue limit",
GNUNET_NO);
for (struct Queue *s = tc->details.communicator.queue_head; NULL != s;
s = s->next_client)
- schedule_transmit_on_queue (s, GNUNET_NO);
+ schedule_transmit_on_queue (s, GNUNET_SCHEDULER_PRIORITY_DEFAULT);
}
notify_monitors (&neighbour->pid, queue->address, queue->nt, &me);
GNUNET_free (queue);
- vl = GNUNET_CONTAINER_multipeermap_get (links, &neighbour->pid);
+ vl = lookup_virtual_link (&neighbour->pid);
if ((NULL != vl) && (neighbour == vl->n))
{
GNUNET_SCHEDULER_cancel (vl->visibility_task);
}
-/**
- * Free fragment tree below @e root, excluding @e root itself.
- * FIXME: this does NOT seem to have the intended semantics
- * based on how this is called. Seems we generally DO expect
- * @a root to be free'ed itself as well!
- *
- * @param root root of the tree to free
- */
-static void
-free_fragment_tree (struct PendingMessage *root)
-{
- struct PendingMessage *frag;
-
- while (NULL != (frag = root->head_frag))
- {
- struct PendingAcknowledgement *pa;
-
- free_fragment_tree (frag);
- while (NULL != (pa = frag->pa_head))
- {
- GNUNET_CONTAINER_MDLL_remove (pm, frag->pa_head, frag->pa_tail, pa);
- pa->pm = NULL;
- }
- GNUNET_CONTAINER_MDLL_remove (frag, root->head_frag, root->tail_frag, frag);
- GNUNET_free (frag);
- }
-}
-
-
-/**
- * Release memory associated with @a pm and remove @a pm from associated
- * data structures. @a pm must be a top-level pending message and not
- * a fragment in the tree. The entire tree is freed (if applicable).
- *
- * @param pm the pending message to free
- */
-static void
-free_pending_message (struct PendingMessage *pm)
-{
- struct TransportClient *tc = pm->client;
- struct Neighbour *target = pm->target;
- struct DistanceVectorHop *dvh = pm->dvh;
- struct PendingAcknowledgement *pa;
-
- if (NULL != tc)
- {
- GNUNET_CONTAINER_MDLL_remove (client,
- tc->details.core.pending_msg_head,
- tc->details.core.pending_msg_tail,
- pm);
- }
- if (NULL != dvh)
- {
- GNUNET_CONTAINER_MDLL_remove (dvh,
- dvh->pending_msg_head,
- dvh->pending_msg_tail,
- pm);
- }
- GNUNET_CONTAINER_MDLL_remove (neighbour,
- target->pending_msg_head,
- target->pending_msg_tail,
- pm);
- while (NULL != (pa = pm->pa_head))
- {
- GNUNET_CONTAINER_MDLL_remove (pm, pm->pa_head, pm->pa_tail, pa);
- pa->pm = NULL;
- }
-
- free_fragment_tree (pm);
- if (NULL != pm->qe)
- {
- GNUNET_assert (pm == pm->qe->pm);
- pm->qe->pm = NULL;
- }
- GNUNET_free_non_null (pm->bpm);
- GNUNET_free (pm);
-}
-
-
/**
* Send a response to the @a pm that we have processed a "send"
* request. Sends a confirmation to the "core" client responsible for
client_send_response (struct PendingMessage *pm)
{
struct TransportClient *tc = pm->client;
- struct Neighbour *target = pm->target;
+ struct VirtualLink *vl = pm->vl;
struct GNUNET_MQ_Envelope *env;
struct SendOkMessage *som;
if (NULL != tc)
{
env = GNUNET_MQ_msg (som, GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
- som->peer = target->pid;
+ som->peer = vl->target;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Confirming transmission of <%llu> to %s\n",
pm->logging_uuid,
- GNUNET_i2s (&pm->target->pid));
+ GNUNET_i2s (&vl->target));
GNUNET_MQ_send (tc->mq, env);
}
free_pending_message (pm);
}
-/**
- * Create a DV Box message.
- *
- * @param total_hops how many hops did the message take so far
- * @param num_hops length of the @a hops array
- * @param origin origin of the message
- * @param hops next peer(s) to the destination, including destination
- * @param payload encrypted (!) payload of the box
- * @param payload_size number of bytes in @a payload
- * @return boxed message (caller must #GNUNET_free() it).
- */
-static struct TransportDVBoxMessage *
-create_dv_box (uint16_t total_hops,
- const struct GNUNET_PeerIdentity *origin,
- const struct GNUNET_PeerIdentity *target,
- uint16_t num_hops,
- const struct GNUNET_PeerIdentity *hops,
- const void *payload,
- uint16_t payload_size)
-{
- struct TransportDVBoxMessage *dvb;
- struct GNUNET_PeerIdentity *dhops;
-
- GNUNET_assert (UINT16_MAX <
- sizeof (struct TransportDVBoxMessage) +
- sizeof (struct GNUNET_PeerIdentity) * (num_hops + 1) +
- payload_size);
- dvb = GNUNET_malloc (sizeof (struct TransportDVBoxMessage) +
- sizeof (struct GNUNET_PeerIdentity) * (num_hops + 1) +
- payload_size);
- dvb->header.size =
- htons (sizeof (struct TransportDVBoxMessage) +
- sizeof (struct GNUNET_PeerIdentity) * (num_hops + 1) + payload_size);
- dvb->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DV_BOX);
- dvb->total_hops = htons (total_hops);
- dvb->num_hops = htons (num_hops + 1);
- dvb->origin = *origin;
- dhops = (struct GNUNET_PeerIdentity *) &dvb[1];
- memcpy (dhops, hops, num_hops * sizeof (struct GNUNET_PeerIdentity));
- dhops[num_hops] = *target;
- memcpy (&dhops[num_hops + 1], payload, payload_size);
-
- if (GNUNET_EXTRA_LOGGING > 0)
- {
- char *path;
-
- path = GNUNET_strdup (GNUNET_i2s (&dvb->origin));
- for (unsigned int i = 0; i <= num_hops; i++)
- {
- char *tmp;
-
- GNUNET_asprintf (&tmp, "%s-%s", path, GNUNET_i2s (&dhops[i]));
- GNUNET_free (path);
- path = tmp;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Creating DVBox for %u bytes of payload via %s\n",
- (unsigned int) payload_size,
- path);
- GNUNET_free (path);
- }
-
- return dvb;
-}
-
-
/**
* Pick @a hops_array_length random DV paths satisfying @a options
*
}
+/**
+ * There is a message at the head of the pending messages for @a vl
+ * which may be ready for transmission. Check if a queue is ready to
+ * take it.
+ *
+ * This function must (1) check for flow control to ensure that we can
+ * right now send to @a vl, (2) check that the pending message in the
+ * queue is actually eligible, (3) determine if any applicable queue
+ * (direct neighbour or DVH path) is ready to accept messages, and
+ * (4) prioritize based on the preferences associated with the
+ * pending message.
+ *
+ * So yeah, easy.
+ *
+ * @param vl virtual link where we should check for transmission
+ */
+static void
+check_vl_transmission (struct VirtualLink *vl)
+{
+ struct Neighbour *n = vl->n;
+ struct DistanceVector *dv = vl->dv;
+ struct GNUNET_TIME_Absolute now;
+ int elig;
+
+ /* FIXME-FC: need to implement virtual link flow control! */
+
+ /* Check that we have an eligible pending message!
+ (cheaper than having #transmit_on_queue() find out!) */
+ elig = GNUNET_NO;
+ for (struct PendingMessage *pm = vl->pending_msg_head; NULL != pm;
+ pm = pm->next_vl)
+ {
+ if (NULL != pm->qe)
+ continue; /* not eligible, is in a queue! */
+ elig = GNUNET_YES;
+ break;
+ }
+ if (GNUNET_NO == elig)
+ return;
+
+ /* Notify queues at direct neighbours that we are interested */
+ now = GNUNET_TIME_absolute_get ();
+ if (NULL != n)
+ {
+ for (struct Queue *queue = n->queue_head; NULL != queue;
+ queue = queue->next_neighbour)
+ if ((GNUNET_YES == queue->idle) &&
+ (queue->validated_until.abs_value_us > now.abs_value_us))
+ schedule_transmit_on_queue (queue, GNUNET_SCHEDULER_PRIORITY_DEFAULT);
+ }
+ /* Notify queues via DV that we are interested */
+ if (NULL != dv)
+ {
+ /* Do DV with lower scheduler priority, which effectively means that
+ IF a neighbour exists and is available, we prefer it. */
+ for (struct DistanceVectorHop *pos = dv->dv_head; NULL != pos;
+ pos = pos->next_dv)
+ {
+ struct Neighbour *nh = pos->next_hop;
+
+ if (pos->path_valid_until.abs_value_us <= now.abs_value_us)
+ continue; /* skip this one: path not validated */
+ for (struct Queue *queue = nh->queue_head; NULL != queue;
+ queue = queue->next_neighbour)
+ if ((GNUNET_YES == queue->idle) &&
+ (queue->validated_until.abs_value_us > now.abs_value_us))
+ schedule_transmit_on_queue (queue,
+ GNUNET_SCHEDULER_PRIORITY_BACKGROUND);
+ }
+ }
+}
+
+
/**
* Client asked for transmission to a peer. Process the request.
*
struct TransportClient *tc = cls;
struct PendingMessage *pm;
const struct GNUNET_MessageHeader *obmm;
- struct Neighbour *target;
- struct DistanceVector *dv;
- struct DistanceVectorHop *dvh;
uint32_t bytes_msg;
- int was_empty;
- const void *payload;
- size_t payload_size;
- struct TransportDVBoxMessage *dvb;
struct VirtualLink *vl;
enum GNUNET_MQ_PriorityPreferences pp;
obmm = (const struct GNUNET_MessageHeader *) &obm[1];
bytes_msg = ntohs (obmm->size);
pp = (enum GNUNET_MQ_PriorityPreferences) ntohl (obm->priority);
- vl = GNUNET_CONTAINER_multipeermap_get (links, &obm->peer);
+ vl = lookup_virtual_link (&obm->peer);
if (NULL == vl)
{
/* Failure: don't have this peer as a neighbour (anymore).
GNUNET_NO);
return;
}
- target = lookup_neighbour (&obm->peer);
- if (NULL == target)
- dv = GNUNET_CONTAINER_multipeermap_get (dv_routes, &obm->peer);
- else
- dv = NULL;
- GNUNET_assert ((NULL != target) || (NULL != dv));
- if (NULL == target)
- {
- unsigned int res;
- struct DistanceVectorHop *dvh;
-
- res = pick_random_dv_hops (dv, RMO_NONE, &dvh, 1);
- GNUNET_assert (1 == res);
- target = dvh->next_hop;
- /* FIXME: encrypt bytes_msg at &obm[1] to &obm->peer first! */
- dvb = create_dv_box (0,
- &GST_my_identity,
- &obm->peer,
- dvh->distance,
- dvh->path,
- &obm[1],
- bytes_msg);
- payload = dvb;
- payload_size = ntohs (dvb->header.size);
- }
- else
- {
- dvh = NULL;
- dvb = NULL;
- payload = &obm[1];
- payload_size = bytes_msg;
- }
- was_empty = (NULL == target->pending_msg_head);
- pm = GNUNET_malloc (sizeof (struct PendingMessage) + payload_size);
+ pm = GNUNET_malloc (sizeof (struct PendingMessage) + bytes_msg);
pm->logging_uuid = logging_uuid_gen++;
pm->prefs = pp;
pm->client = tc;
- pm->target = target;
- pm->bytes_msg = payload_size;
- memcpy (&pm[1], payload, payload_size);
- GNUNET_free_non_null (dvb);
- dvb = NULL;
- pm->dvh = dvh;
+ pm->vl = vl;
+ pm->bytes_msg = bytes_msg;
+ memcpy (&pm[1], obmm, bytes_msg);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Sending %u bytes as <%llu> to %s using %s\n",
+ "Sending %u bytes as <%llu> to %s\n",
bytes_msg,
pm->logging_uuid,
- GNUNET_i2s (&obm->peer),
- (NULL == target) ? "distance vector path" : "direct queue");
- if (NULL != dvh)
- {
- GNUNET_CONTAINER_MDLL_insert (dvh,
- dvh->pending_msg_head,
- dvh->pending_msg_tail,
- pm);
- }
- GNUNET_CONTAINER_MDLL_insert (neighbour,
- target->pending_msg_head,
- target->pending_msg_tail,
- pm);
+ GNUNET_i2s (&obm->peer));
GNUNET_CONTAINER_MDLL_insert (client,
tc->details.core.pending_msg_head,
tc->details.core.pending_msg_tail,
pm);
- if (! was_empty)
- return; /* all queues must already be busy */
- for (struct Queue *queue = target->queue_head; NULL != queue;
- queue = queue->next_neighbour)
- {
- /* try transmission on any queue that is idle */
- if (NULL == queue->transmit_task)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Queue %llu to %s is idle, triggering transmission\n",
- (unsigned long long) queue->qid,
- GNUNET_i2s (&queue->neighbour->pid));
- queue->transmit_task =
- GNUNET_SCHEDULER_add_now (&transmit_on_queue, queue);
- }
- }
+ GNUNET_CONTAINER_MDLL_insert (vl,
+ vl->pending_msg_head,
+ vl->pending_msg_tail,
+ pm);
+ check_vl_transmission (vl);
}
GNUNET_SERVICE_client_drop (tc->client);
return;
}
- vl = GNUNET_CONTAINER_multipeermap_get (links, &rom->peer);
+ vl = lookup_virtual_link (&rom->peer);
if (NULL == vl)
{
GNUNET_STATISTICS_update (GST_stats,
(void) cls;
msize = ntohs (cb->header.size) - sizeof (*cb);
- if (((size_t) (UINT16_MAX - msize)) >
- sizeof (struct TransportBackchannelEncapsulationMessage) +
- sizeof (struct TransportBackchannelRequestPayloadP))
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
inbox = (const struct GNUNET_MessageHeader *) &cb[1];
isize = ntohs (inbox->size);
if (isize >= msize)
is = (const char *) inbox;
is += isize;
msize -= isize;
- GNUNET_assert (msize > 0);
+ GNUNET_assert (0 < msize);
if ('\0' != is[msize - 1])
{
GNUNET_break (0);
/**
- * Remove memory used by expired ephemeral keys.
- *
- * @param cls NULL
- */
-static void
-expire_ephemerals (void *cls)
-{
- struct EphemeralCacheEntry *ece;
-
- (void) cls;
- ephemeral_task = NULL;
- while (NULL != (ece = GNUNET_CONTAINER_heap_peek (ephemeral_heap)))
- {
- if (0 == GNUNET_TIME_absolute_get_remaining (ece->ephemeral_validity)
- .rel_value_us)
- {
- free_ephemeral (ece);
- continue;
- }
- ephemeral_task = GNUNET_SCHEDULER_add_at (ece->ephemeral_validity,
- &expire_ephemerals,
- NULL);
- return;
- }
-}
-
-
-/**
- * Lookup ephemeral key in our #ephemeral_map. If no valid one exists,
- * generate one, cache it and return it.
+ * Ensure ephemeral keys in our @a dv are current. If no current one exists,
+ * set it up.
*
- * @param pid peer to look up ephemeral for
- * @param private_key[out] set to the private key
- * @param ephemeral_key[out] set to the key
- * @param ephemeral_sender_sig[out] set to the signature
- * @param monotime[out] set to the monotime used for the signature
+ * @param dv[in,out] virtual link to update ephemeral for
*/
static void
-lookup_ephemeral (const struct GNUNET_PeerIdentity *pid,
- struct GNUNET_CRYPTO_EcdhePrivateKey *private_key,
- struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral_key,
- struct GNUNET_CRYPTO_EddsaSignature *ephemeral_sender_sig,
- struct GNUNET_TIME_Absolute *monotime)
+update_ephemeral (struct DistanceVector *dv)
{
- struct EphemeralCacheEntry *ece;
struct EphemeralConfirmationPS ec;
- ece = GNUNET_CONTAINER_multipeermap_get (ephemeral_map, pid);
- if ((NULL != ece) &&
- (0 == GNUNET_TIME_absolute_get_remaining (ece->ephemeral_validity)
- .rel_value_us))
- {
- free_ephemeral (ece);
- ece = NULL;
- }
- if (NULL == ece)
- {
- ece = GNUNET_new (struct EphemeralCacheEntry);
- ece->target = *pid;
- ece->monotime = GNUNET_TIME_absolute_get_monotonic (GST_cfg);
- ece->ephemeral_validity =
- GNUNET_TIME_absolute_add (ece->monotime, EPHEMERAL_VALIDITY);
- GNUNET_assert (GNUNET_OK ==
- GNUNET_CRYPTO_ecdhe_key_create2 (&ece->private_key));
- GNUNET_CRYPTO_ecdhe_key_get_public (&ece->private_key, &ece->ephemeral_key);
- ec.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_EPHEMERAL);
- ec.purpose.size = htonl (sizeof (ec));
- ec.target = *pid;
- ec.ephemeral_key = ece->ephemeral_key;
- GNUNET_assert (GNUNET_OK == GNUNET_CRYPTO_eddsa_sign (GST_my_private_key,
- &ec.purpose,
- &ece->sender_sig));
- ece->hn =
- GNUNET_CONTAINER_heap_insert (ephemeral_heap,
- ece,
- ece->ephemeral_validity.abs_value_us);
- GNUNET_assert (GNUNET_OK ==
- GNUNET_CONTAINER_multipeermap_put (
- ephemeral_map,
- &ece->target,
- ece,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
- if (NULL == ephemeral_task)
- ephemeral_task = GNUNET_SCHEDULER_add_at (ece->ephemeral_validity,
- &expire_ephemerals,
- NULL);
- }
- *private_key = ece->private_key;
- *ephemeral_key = ece->ephemeral_key;
- *ephemeral_sender_sig = ece->sender_sig;
- *monotime = ece->monotime;
+ if (0 !=
+ GNUNET_TIME_absolute_get_remaining (dv->ephemeral_validity).rel_value_us)
+ return;
+ dv->monotime = GNUNET_TIME_absolute_get_monotonic (GST_cfg);
+ dv->ephemeral_validity =
+ GNUNET_TIME_absolute_add (dv->monotime, EPHEMERAL_VALIDITY);
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CRYPTO_ecdhe_key_create2 (&dv->private_key));
+ GNUNET_CRYPTO_ecdhe_key_get_public (&dv->private_key, &dv->ephemeral_key);
+ ec.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_EPHEMERAL);
+ ec.purpose.size = htonl (sizeof (ec));
+ ec.target = dv->target;
+ ec.ephemeral_key = dv->ephemeral_key;
+ GNUNET_assert (GNUNET_OK == GNUNET_CRYPTO_eddsa_sign (GST_my_private_key,
+ &ec.purpose,
+ &dv->sender_sig));
}
/**
- * Send the control message @a payload on @a queue.
+ * Send the message @a payload on @a queue.
*
* @param queue the queue to use for transmission
* @param pm pending message to update once transmission is done, may be NULL!
struct GNUNET_TRANSPORT_SendMessageTo *smt;
struct GNUNET_MQ_Envelope *env;
+ queue->idle = GNUNET_NO;
GNUNET_log (
GNUNET_ERROR_TYPE_DEBUG,
"Queueing %u bytes of payload for transmission <%llu> on queue %llu to %s\n",
GNUNET_assert (CT_COMMUNICATOR == queue->tc->type);
queue->queue_length++;
queue->tc->details.communicator.total_queue_length++;
+ if (COMMUNICATOR_TOTAL_QUEUE_LIMIT ==
+ queue->tc->details.communicator.total_queue_length)
+ queue->idle = GNUNET_NO;
+ if (QUEUE_LENGTH_LIMIT == queue->queue_length)
+ queue->idle = GNUNET_NO;
GNUNET_MQ_send (queue->tc->mq, env);
}
}
GNUNET_NO);
return;
}
+
sel1 = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, candidates);
if (0 == (options & RMO_REDUNDANT))
sel2 = candidates; /* picks none! */
/**
- * Given a distance vector path @a dvh route @a payload to
- * the ultimate destination respecting @a options.
- * Sets up the boxed message and queues it at the next hop.
- *
- * @param dvh choice of the path for the message
- * @param payload encrypted body to transmit
- * @param payload_len number of bytes in @a payload
- * @param options options to use for control
+ * Structure of the key material used to encrypt backchannel messages.
*/
-static void
-forward_via_dvh (const struct DistanceVectorHop *dvh,
- const void *payload,
- size_t payload_len,
- enum RouteMessageOptions options)
+struct DVKeyState
{
- struct TransportDVBoxMessage *dvb;
+ /**
+ * State of our block cipher.
+ */
+ gcry_cipher_hd_t cipher;
- dvb = create_dv_box (0,
- &GST_my_identity,
- &dvh->dv->target,
- dvh->distance,
- dvh->path,
- payload,
- payload_len);
- route_via_neighbour (dvh->next_hop, &dvb->header, options);
- GNUNET_free (dvb);
-}
+ /**
+ * Actual key material.
+ */
+ struct
+ {
+ /**
+ * Key used for HMAC calculations (via #GNUNET_CRYPTO_hmac()).
+ */
+ struct GNUNET_CRYPTO_AuthKey hmac_key;
-/**
- * Pick a path of @a dv under constraints @a options and schedule
- * transmission of @a hdr.
- *
- * @param n neighbour to send to
- * @param hdr message to send as payload
- * @param options whether path must be confirmed or not
- * and whether we may pick multiple (2) paths
- */
-static void
-route_via_dv (const struct DistanceVector *dv,
- const struct GNUNET_MessageHeader *hdr,
- enum RouteMessageOptions options)
-{
- struct DistanceVectorHop *hops[2];
- unsigned int res;
+ /**
+ * Symmetric key to use for encryption.
+ */
+ char aes_key[256 / 8];
- res = pick_random_dv_hops (dv,
- options,
- hops,
- (0 == (options & RMO_REDUNDANT)) ? 1 : 2);
- if (0 == res)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "Failed to route message, could not determine DV path\n");
- return;
- }
- // FIXME: we should encrypt `hdr` here first!
- for (unsigned int i = 0; i < res; i++)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Routing message of type %u to %s using DV (#%u/%u)\n",
- ntohs (hdr->type),
- GNUNET_i2s (&dv->target),
- i + 1,
- res + 1);
- forward_via_dvh (hops[i],
- hdr,
- ntohs (
- hdr->size), /* FIXME: can't do this once encrypted... */
- options & (~RMO_REDUNDANT));
- }
-}
+ /**
+ * Counter value to use during setup.
+ */
+ char aes_ctr[128 / 8];
+
+ } material;
+};
/**
- * We need to transmit @a hdr to @a target. If necessary, this may
- * involve DV routing.
+ * Given the key material in @a km and the initialization vector
+ * @a iv, setup the key material for the backchannel in @a key.
*
- * @param target peer to receive @a hdr
- * @param hdr header of the message to route and #GNUNET_free()
- * @param options which transmission channels are allowed
+ * @param km raw master secret
+ * @param iv initialization vector
+ * @param key[out] symmetric cipher and HMAC state to generate
*/
static void
-route_message (const struct GNUNET_PeerIdentity *target,
- struct GNUNET_MessageHeader *hdr,
- enum RouteMessageOptions options)
-{
- struct VirtualLink *vl;
- struct Neighbour *n;
- struct DistanceVector *dv;
-
- vl = GNUNET_CONTAINER_multipeermap_get (links, target);
- n = vl->n;
- dv = (0 != (options & RMO_DV_ALLOWED)) ? vl->dv : NULL;
- if (0 == (options & RMO_UNCONFIRMED_ALLOWED))
- {
- /* if confirmed is required, and we do not have anything
- confirmed, drop respective options */
- if (NULL == n)
- n = lookup_neighbour (target);
- if ((NULL == dv) && (0 != (options & RMO_DV_ALLOWED)))
- dv = GNUNET_CONTAINER_multipeermap_get (dv_routes, target);
- }
- if ((NULL == n) && (NULL == dv))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "Cannot route message of type %u to %s: no route\n",
- ntohs (hdr->type),
- GNUNET_i2s (target));
- GNUNET_STATISTICS_update (GST_stats,
- "# Messages dropped in routing: no acceptable method",
- 1,
- GNUNET_NO);
- GNUNET_free (hdr);
- return;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Routing message of type %u to %s with options %X\n",
- ntohs (hdr->type),
- GNUNET_i2s (target),
- (unsigned int) options);
- /* If both dv and n are possible and we must choose:
- flip a coin for the choice between the two; for now 50/50 */
- if ((NULL != n) && (NULL != dv) && (0 == (options & RMO_REDUNDANT)))
- {
- if (0 == GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 2))
- n = NULL;
- else
- dv = NULL;
- }
- if ((NULL != n) && (NULL != dv))
- options &= ~RMO_REDUNDANT; /* We will do one DV and one direct, that's
- enough for redunancy, so clear the flag. */
- if (NULL != n)
- {
- route_via_neighbour (n, hdr, options);
- }
- if (NULL != dv)
- {
- route_via_dv (dv, hdr, options);
- }
- GNUNET_free (hdr);
-}
-
-
-/**
- * Structure of the key material used to encrypt backchannel messages.
- */
-struct BackchannelKeyState
-{
- /**
- * State of our block cipher.
- */
- gcry_cipher_hd_t cipher;
-
- /**
- * Actual key material.
- */
- struct
- {
-
- /**
- * Key used for HMAC calculations (via #GNUNET_CRYPTO_hmac()).
- */
- struct GNUNET_CRYPTO_AuthKey hmac_key;
-
- /**
- * Symmetric key to use for encryption.
- */
- char aes_key[256 / 8];
-
- /**
- * Counter value to use during setup.
- */
- char aes_ctr[128 / 8];
-
- } material;
-};
-
-
-/**
- * Given the key material in @a km and the initialization vector
- * @a iv, setup the key material for the backchannel in @a key.
- *
- * @param km raw master secret
- * @param iv initialization vector
- * @param key[out] symmetric cipher and HMAC state to generate
- */
-static void
-bc_setup_key_state_from_km (const struct GNUNET_HashCode *km,
- const struct GNUNET_ShortHashCode *iv,
- struct BackchannelKeyState *key)
+dv_setup_key_state_from_km (const struct GNUNET_HashCode *km,
+ const struct GNUNET_ShortHashCode *iv,
+ struct DVKeyState *key)
{
/* must match #dh_key_derive_eph_pub */
GNUNET_assert (GNUNET_YES ==
const struct GNUNET_CRYPTO_EcdhePrivateKey *priv_ephemeral,
const struct GNUNET_PeerIdentity *target,
const struct GNUNET_ShortHashCode *iv,
- struct BackchannelKeyState *key)
+ struct DVKeyState *key)
{
struct GNUNET_HashCode km;
GNUNET_assert (GNUNET_YES == GNUNET_CRYPTO_ecdh_eddsa (priv_ephemeral,
&target->public_key,
&km));
- bc_setup_key_state_from_km (&km, iv, key);
+ dv_setup_key_state_from_km (&km, iv, key);
}
static void
dh_key_derive_eph_pub (const struct GNUNET_CRYPTO_EcdhePublicKey *pub_ephemeral,
const struct GNUNET_ShortHashCode *iv,
- struct BackchannelKeyState *key)
+ struct DVKeyState *key)
{
struct GNUNET_HashCode km;
GNUNET_assert (GNUNET_YES == GNUNET_CRYPTO_eddsa_ecdh (GST_my_private_key,
pub_ephemeral,
&km));
- bc_setup_key_state_from_km (&km, iv, key);
+ dv_setup_key_state_from_km (&km, iv, key);
}
* @param data_size number of bytes in @a data
*/
static void
-bc_hmac (const struct BackchannelKeyState *key,
+dv_hmac (const struct DVKeyState *key,
struct GNUNET_HashCode *hmac,
const void *data,
size_t data_size)
* @param in_size number of bytes of input in @a in and available at @a dst
*/
static void
-bc_encrypt (struct BackchannelKeyState *key,
- const void *in,
- void *dst,
- size_t in_size)
+dv_encrypt (struct DVKeyState *key, const void *in, void *dst, size_t in_size)
{
GNUNET_assert (0 ==
gcry_cipher_encrypt (key->cipher, dst, in_size, in, in_size));
* @param out_size number of bytes of input in @a ciph and available in @a out
*/
static void
-bc_decrypt (struct BackchannelKeyState *key,
+dv_decrypt (struct DVKeyState *key,
void *out,
const void *ciph,
size_t out_size)
* @param key key material to clean up (memory must not be free'd!)
*/
static void
-bc_key_clean (struct BackchannelKeyState *key)
+dv_key_clean (struct DVKeyState *key)
{
gcry_cipher_close (key->cipher);
GNUNET_CRYPTO_zero_keys (&key->material, sizeof (key->material));
}
+/**
+ * Function to call to further operate on the now DV encapsulated
+ * message @a hdr, forwarding it via @a next_hop under respect of
+ * @a options.
+ *
+ * @param cls closure
+ * @param next_hop next hop of the DV path
+ * @param hdr encapsulated message, technically a `struct TransportDFBoxMessage`
+ * @param options options of the original message
+ */
+typedef void (*DVMessageHandler) (void *cls,
+ struct Neighbour *next_hop,
+ const struct GNUNET_MessageHeader *hdr,
+ enum RouteMessageOptions options);
+
+/**
+ * Pick a path of @a dv under constraints @a options and schedule
+ * transmission of @a hdr.
+ *
+ * @param target neighbour to ultimately send to
+ * @param num_dvhs length of the @a dvhs array
+ * @param dvhs array of hops to send the message to
+ * @param hdr message to send as payload
+ * @param use function to call with the encapsulated message
+ * @param use_cls closure for @a use
+ * @param options whether path must be confirmed or not, to be passed to @a use
+ */
+static void
+encapsulate_for_dv (struct DistanceVector *dv,
+ unsigned int num_dvhs,
+ struct DistanceVectorHop **dvhs,
+ const struct GNUNET_MessageHeader *hdr,
+ DVMessageHandler use,
+ void *use_cls,
+ enum RouteMessageOptions options)
+{
+ struct TransportDVBoxMessage box_hdr;
+ struct TransportDVBoxPayloadP payload_hdr;
+ uint16_t enc_body_size = ntohs (hdr->size);
+ char enc[sizeof (struct TransportDVBoxPayloadP) + enc_body_size] GNUNET_ALIGN;
+ struct TransportDVBoxPayloadP *enc_payload_hdr =
+ (struct TransportDVBoxPayloadP *) enc;
+ struct DVKeyState key;
+
+ /* Encrypt payload */
+ box_hdr.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DV_BOX);
+ box_hdr.total_hops = htons (0);
+ update_ephemeral (dv);
+ box_hdr.ephemeral_key = dv->ephemeral_key;
+ payload_hdr.sender_sig = dv->sender_sig;
+ GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_NONCE,
+ &box_hdr.iv,
+ sizeof (box_hdr.iv));
+ dh_key_derive_eph_pid (&dv->private_key, &dv->target, &box_hdr.iv, &key);
+ payload_hdr.sender = GST_my_identity;
+ payload_hdr.monotonic_time = GNUNET_TIME_absolute_hton (dv->monotime);
+ dv_encrypt (&key, &payload_hdr, enc_payload_hdr, sizeof (payload_hdr));
+ dv_encrypt (&key,
+ hdr,
+ &enc[sizeof (struct TransportDVBoxPayloadP)],
+ enc_body_size);
+ dv_hmac (&key, &box_hdr.hmac, enc, sizeof (enc));
+ dv_key_clean (&key);
+
+ /* For each selected path, take the pre-computed header and body
+ and add the path in the middle of the message; then send it. */
+ for (unsigned int i = 0; i < num_dvhs; i++)
+ {
+ struct DistanceVectorHop *dvh = dvhs[i];
+ unsigned int num_hops = dvh->distance + 1;
+ char buf[sizeof (struct TransportDVBoxMessage) +
+ sizeof (struct GNUNET_PeerIdentity) * num_hops +
+ sizeof (struct TransportDVBoxPayloadP) +
+ enc_body_size] GNUNET_ALIGN;
+ struct GNUNET_PeerIdentity *dhops;
+
+ box_hdr.header.size = htons (sizeof (buf));
+ box_hdr.num_hops = htons (num_hops);
+ memcpy (buf, &box_hdr, sizeof (box_hdr));
+ dhops = (struct GNUNET_PeerIdentity *) &buf[sizeof (box_hdr)];
+ memcpy (dhops,
+ dvh->path,
+ dvh->distance * sizeof (struct GNUNET_PeerIdentity));
+ dhops[dvh->distance] = dv->target;
+ if (GNUNET_EXTRA_LOGGING > 0)
+ {
+ char *path;
+
+ path = GNUNET_strdup (GNUNET_i2s (&GST_my_identity));
+ for (unsigned int i = 0; i <= num_hops; i++)
+ {
+ char *tmp;
+
+ GNUNET_asprintf (&tmp, "%s-%s", path, GNUNET_i2s (&dhops[i]));
+ GNUNET_free (path);
+ path = tmp;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Routing message of type %u to %s using DV (#%u/%u) via %s\n",
+ ntohs (hdr->type),
+ GNUNET_i2s (&dv->target),
+ i + 1,
+ num_dvhs + 1,
+ path);
+ GNUNET_free (path);
+ }
+
+ memcpy (&dhops[num_hops], enc, sizeof (enc));
+ use (use_cls,
+ dvh->next_hop,
+ (const struct GNUNET_MessageHeader *) buf,
+ options);
+ }
+}
+
+
+/**
+ * Wrapper around #route_via_neighbour() that matches the
+ * #DVMessageHandler structure.
+ *
+ * @param cls unused
+ * @param next_hop where to send next
+ * @param hdr header of the message to send
+ * @param options message options for queue selection
+ */
+static void
+send_dv_to_neighbour (void *cls,
+ struct Neighbour *next_hop,
+ const struct GNUNET_MessageHeader *hdr,
+ enum RouteMessageOptions options)
+{
+ (void) cls;
+ route_via_neighbour (next_hop, hdr, options);
+}
+
+
+/**
+ * We need to transmit @a hdr to @a target. If necessary, this may
+ * involve DV routing.
+ *
+ * @param target peer to receive @a hdr
+ * @param hdr header of the message to route and #GNUNET_free()
+ * @param options which transmission channels are allowed
+ */
+static void
+route_message (const struct GNUNET_PeerIdentity *target,
+ const struct GNUNET_MessageHeader *hdr,
+ enum RouteMessageOptions options)
+{
+ struct VirtualLink *vl;
+ struct Neighbour *n;
+ struct DistanceVector *dv;
+
+ vl = lookup_virtual_link (target);
+ n = vl->n;
+ dv = (0 != (options & RMO_DV_ALLOWED)) ? vl->dv : NULL;
+ if (0 == (options & RMO_UNCONFIRMED_ALLOWED))
+ {
+ /* if confirmed is required, and we do not have anything
+ confirmed, drop respective options */
+ if (NULL == n)
+ n = lookup_neighbour (target);
+ if ((NULL == dv) && (0 != (options & RMO_DV_ALLOWED)))
+ dv = GNUNET_CONTAINER_multipeermap_get (dv_routes, target);
+ }
+ if ((NULL == n) && (NULL == dv))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "Cannot route message of type %u to %s: no route\n",
+ ntohs (hdr->type),
+ GNUNET_i2s (target));
+ GNUNET_STATISTICS_update (GST_stats,
+ "# Messages dropped in routing: no acceptable method",
+ 1,
+ GNUNET_NO);
+ return;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Routing message of type %u to %s with options %X\n",
+ ntohs (hdr->type),
+ GNUNET_i2s (target),
+ (unsigned int) options);
+ /* If both dv and n are possible and we must choose:
+ flip a coin for the choice between the two; for now 50/50 */
+ if ((NULL != n) && (NULL != dv) && (0 == (options & RMO_REDUNDANT)))
+ {
+ if (0 == GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 2))
+ n = NULL;
+ else
+ dv = NULL;
+ }
+ if ((NULL != n) && (NULL != dv))
+ options &= ~RMO_REDUNDANT; /* We will do one DV and one direct, that's
+ enough for redunancy, so clear the flag. */
+ if (NULL != n)
+ {
+ route_via_neighbour (n, hdr, options);
+ }
+ if (NULL != dv)
+ {
+ struct DistanceVectorHop *hops[2];
+ unsigned int res;
+
+ res = pick_random_dv_hops (dv,
+ options,
+ hops,
+ (0 == (options & RMO_REDUNDANT)) ? 1 : 2);
+ if (0 == res)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "Failed to route message, could not determine DV path\n");
+ return;
+ }
+ encapsulate_for_dv (dv,
+ res,
+ hops,
+ hdr,
+ &send_dv_to_neighbour,
+ NULL,
+ options & (~RMO_REDUNDANT));
+ }
+}
+
+
/**
* Communicator requests backchannel transmission. Process the request.
+ * Just repacks it into our `struct TransportBackchannelEncapsulationMessage *`
+ * (which for now has exactly the same format, only a different message type)
+ * and passes it on for routing.
*
* @param cls the client
* @param cb the send message that was sent
const struct GNUNET_TRANSPORT_CommunicatorBackchannel *cb)
{
struct TransportClient *tc = cls;
- struct GNUNET_CRYPTO_EcdhePrivateKey private_key;
- struct GNUNET_TIME_Absolute monotime;
- struct TransportBackchannelEncapsulationMessage *enc;
- struct TransportBackchannelRequestPayloadP ppay;
- struct BackchannelKeyState key;
- char *mpos;
- uint16_t msize;
-
- {
- const struct GNUNET_MessageHeader *inbox;
- const char *is;
-
- inbox = (const struct GNUNET_MessageHeader *) &cb[1];
- /* 0-termination of 'is' was checked already in
- #check_communicator_backchannel() */
- is = (const char *) &cb[1];
- is += ntohs (inbox->size);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Preparing backchannel transmission to %s:%s of type %u\n",
- GNUNET_i2s (&cb->pid),
- is,
- ntohs (inbox->size));
- }
+ const struct GNUNET_MessageHeader *inbox =
+ (const struct GNUNET_MessageHeader *) &cb[1];
+ uint16_t isize = ntohs (inbox->size);
+ const char *is = ((const char *) &cb[1]) + isize;
+ char
+ mbuf[isize +
+ sizeof (struct TransportBackchannelEncapsulationMessage)] GNUNET_ALIGN;
+ struct TransportBackchannelEncapsulationMessage *be =
+ (struct TransportBackchannelEncapsulationMessage *) mbuf;
+
+ /* 0-termination of 'is' was checked already in
+ #check_communicator_backchannel() */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Preparing backchannel transmission to %s:%s of type %u\n",
+ GNUNET_i2s (&cb->pid),
+ is,
+ ntohs (inbox->size));
/* encapsulate and encrypt message */
-
- /* FIXME: this should be done with the DV logic for all
- DV messages, NOT here only for backchannel! */
- msize = ntohs (cb->header.size) - sizeof (*cb) +
- sizeof (struct TransportBackchannelRequestPayloadP);
- enc = GNUNET_malloc (sizeof (*enc) + msize);
- enc->header.type =
+ be->header.type =
htons (GNUNET_MESSAGE_TYPE_TRANSPORT_BACKCHANNEL_ENCAPSULATION);
- enc->header.size = htons (sizeof (*enc) + msize);
- enc->target = cb->pid;
- lookup_ephemeral (&cb->pid,
- &private_key,
- &enc->ephemeral_key,
- &ppay.sender_sig,
- &monotime);
- GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_NONCE,
- &enc->iv,
- sizeof (enc->iv));
- dh_key_derive_eph_pid (&private_key, &cb->pid, &enc->iv, &key);
- ppay.monotonic_time = GNUNET_TIME_absolute_hton (monotime);
- mpos = (char *) &enc[1];
- bc_encrypt (&key, &ppay, mpos, sizeof (ppay));
- bc_encrypt (&key,
- &cb[1],
- &mpos[sizeof (ppay)],
- ntohs (cb->header.size) - sizeof (*cb));
- bc_hmac (&key,
- &enc->hmac,
- mpos,
- sizeof (ppay) + ntohs (cb->header.size) - sizeof (*cb));
- bc_key_clean (&key);
- route_message (&cb->pid, &enc->header, RMO_DV_ALLOWED);
+ be->header.size = htons (sizeof (mbuf));
+ memcpy (&be[1], inbox, isize);
+ memcpy (&mbuf[sizeof (struct TransportBackchannelEncapsulationMessage) +
+ isize],
+ is,
+ strlen (is) + 1);
+ route_message (&cb->pid, &be->header, RMO_DV_ALLOWED);
GNUNET_SERVICE_client_continue (tc->client);
}
const struct GNUNET_MessageHeader *msg);
+/**
+ * Function called when we are done giving a message of a certain
+ * size to CORE and should thus decrement the number of bytes of
+ * RAM reserved for that peer's MQ.
+ *
+ * @param cls a `struct CoreSentContext`
+ */
+static void
+core_env_sent_cb (void *cls)
+{
+ struct CoreSentContext *ctx = cls;
+ struct VirtualLink *vl = ctx->vl;
+
+ if (NULL == vl)
+ {
+ /* lost the link in the meantime, ignore */
+ GNUNET_free (ctx);
+ return;
+ }
+ GNUNET_CONTAINER_DLL_remove (vl->csc_head, vl->csc_tail, ctx);
+ GNUNET_assert (vl->incoming_fc_window_size_ram >= ctx->size);
+ vl->incoming_fc_window_size_ram -= ctx->size;
+ vl->incoming_fc_window_size_used += ctx->isize;
+ /* TODO-M1 */
+ GNUNET_free (ctx);
+}
+
+
/**
* Communicator gave us an unencapsulated message to pass as-is to
* CORE. Process the request.
GNUNET_SERVICE_client_drop (client);
return;
}
- vl = GNUNET_CONTAINER_multipeermap_get (links, &cmc->im.sender);
+ vl = lookup_virtual_link (&cmc->im.sender);
if (NULL == vl)
{
/* FIXME: sender is giving us messages for CORE but we don't have
finish_cmc_handling (cmc);
return;
}
+ if (vl->incoming_fc_window_size_ram > UINT_MAX - size)
+ {
+ GNUNET_STATISTICS_update (GST_stats,
+ "# CORE messages droped (FC arithmetic overflow)",
+ 1,
+ GNUNET_NO);
+
+ finish_cmc_handling (cmc);
+ return;
+ }
+ if (vl->incoming_fc_window_size_ram + size > vl->available_fc_window_size)
+ {
+ GNUNET_STATISTICS_update (GST_stats,
+ "# CORE messages droped (FC window overflow)",
+ 1,
+ GNUNET_NO);
+ finish_cmc_handling (cmc);
+ return;
+ }
+
/* Forward to all CORE clients */
have_core = GNUNET_NO;
for (struct TransportClient *tc = clients_head; NULL != tc; tc = tc->next)
{
struct GNUNET_MQ_Envelope *env;
struct InboundMessage *im;
+ struct CoreSentContext *ctx;
if (CT_CORE != tc->type)
continue;
- have_core = GNUNET_YES;
+ vl->incoming_fc_window_size_ram += size;
env = GNUNET_MQ_msg_extra (im, size, GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
+ ctx = GNUNET_new (struct CoreSentContext);
+ ctx->vl = vl;
+ ctx->size = size;
+ ctx->isize = (GNUNET_NO == have_core) ? size : 0;
+ have_core = GNUNET_YES;
+ GNUNET_CONTAINER_DLL_insert (vl->csc_head, vl->csc_tail, ctx);
+ GNUNET_MQ_notify_sent (env, &core_env_sent_cb, ctx);
im->peer = cmc->im.sender;
memcpy (&im[1], mh, size);
GNUNET_MQ_send (tc->mq, env);
+ vl->core_recv_window--;
}
- vl->core_recv_window--;
if (GNUNET_NO == have_core)
+ {
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Dropped message to CORE: no CORE client connected!\n");
- else
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Delivered message from %s of type %u to CORE\n",
- GNUNET_i2s (&cmc->im.sender),
- ntohs (mh->type));
+ /* Nevertheless, count window as used, as it is from the
+ perspective of the other peer! */
+ vl->incoming_fc_window_size_used += size;
+ /* TODO-M1 */
+ finish_cmc_handling (cmc);
+ return;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Delivered message from %s of type %u to CORE\n",
+ GNUNET_i2s (&cmc->im.sender),
+ ntohs (mh->type));
if (vl->core_recv_window > 0)
{
finish_cmc_handling (cmc);
transmit_cummulative_ack_cb (void *cls)
{
struct AcknowledgementCummulator *ac = cls;
- struct TransportReliabilityAckMessage *ack;
+ char buf[sizeof (struct TransportReliabilityAckMessage) +
+ ac->ack_counter *
+ sizeof (struct TransportCummulativeAckPayloadP)] GNUNET_ALIGN;
+ struct TransportReliabilityAckMessage *ack =
+ (struct TransportReliabilityAckMessage *) buf;
struct TransportCummulativeAckPayloadP *ap;
ac->task = NULL;
ac->ack_counter,
GNUNET_i2s (&ac->target));
GNUNET_assert (0 < ac->ack_counter);
- ack = GNUNET_malloc (sizeof (*ack) +
- ac->ack_counter *
- sizeof (struct TransportCummulativeAckPayloadP));
ack->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RELIABILITY_ACK);
ack->header.size =
htons (sizeof (*ack) +
/**
- * The @a pa was acknowledged, process the acknowledgement.
+ * We have completed transmission of @a pm, remove it from
+ * the transmission queues (and if it is a fragment, continue
+ * up the tree as necessary).
*
- * @param pa the pending acknowledgement that was satisfied
- * @param ack_delay artificial delay from cummulative acks created by the
- * other peer
+ * @param pm pending message that was transmitted
*/
static void
-handle_acknowledged (struct PendingAcknowledgement *pa,
- struct GNUNET_TIME_Relative ack_delay)
+completed_pending_message (struct PendingMessage *pm)
{
- struct PendingMessage *pm = pa->pm;
- struct GNUNET_TIME_Relative delay;
+ struct PendingMessage *pos;
- delay = GNUNET_TIME_absolute_get_duration (pa->transmission_time);
- if (delay.rel_value_us > ack_delay.rel_value_us)
- delay = GNUNET_TIME_UNIT_ZERO;
+ switch (pm->pmt)
+ {
+ case PMT_CORE:
+ case PMT_RELIABILITY_BOX:
+ /* Full message sent, we are done */
+ client_send_response (pm);
+ return;
+ case PMT_FRAGMENT_BOX:
+ /* Fragment sent over reliabile channel */
+ free_fragment_tree (pm);
+ pos = pm->frag_parent;
+ GNUNET_CONTAINER_MDLL_remove (frag, pos->head_frag, pos->tail_frag, pm);
+ GNUNET_free (pm);
+ /* check if subtree is done */
+ while ((NULL == pos->head_frag) && (pos->frag_off == pos->bytes_msg) &&
+ (pos != pm))
+ {
+ pm = pos;
+ pos = pm->frag_parent;
+ GNUNET_CONTAINER_MDLL_remove (frag, pos->head_frag, pos->tail_frag, pm);
+ GNUNET_free (pm);
+ }
+
+ /* Was this the last applicable fragmment? */
+ if ((NULL == pos->head_frag) && (NULL == pos->frag_parent) &&
+ (pos->frag_off == pos->bytes_msg))
+ client_send_response (pos);
+ return;
+ }
+}
+
+
+/**
+ * The @a pa was acknowledged, process the acknowledgement.
+ *
+ * @param pa the pending acknowledgement that was satisfied
+ * @param ack_delay artificial delay from cummulative acks created by the
+ * other peer
+ */
+static void
+handle_acknowledged (struct PendingAcknowledgement *pa,
+ struct GNUNET_TIME_Relative ack_delay)
+{
+ struct GNUNET_TIME_Relative delay;
+
+ delay = GNUNET_TIME_absolute_get_duration (pa->transmission_time);
+ if (delay.rel_value_us > ack_delay.rel_value_us)
+ delay = GNUNET_TIME_UNIT_ZERO;
else
delay = GNUNET_TIME_relative_subtract (delay, ack_delay);
if (NULL != pa->queue)
update_queue_performance (pa->queue, delay, pa->message_size);
if (NULL != pa->dvh)
update_dvh_performance (pa->dvh, delay, pa->message_size);
- if (NULL != pm)
- {
- if (NULL != pm->frag_parent)
- {
- pm = pm->frag_parent;
- free_fragment_tree (pa->pm);
- }
- while ((NULL != pm->frag_parent) && (NULL == pm->head_frag))
- {
- struct PendingMessage *parent = pm->frag_parent;
-
- free_fragment_tree (pm);
- pm = parent;
- }
- if (NULL != pm->head_frag)
- pm = NULL; /* we are done, otherwise free 'pm' below */
- }
- if (NULL != pm)
- free_pending_message (pm);
+ if (NULL != pa->pm)
+ completed_pending_message (pa->pm);
free_pending_acknowledgement (pa);
}
void *cls,
const struct TransportBackchannelEncapsulationMessage *be)
{
- uint16_t size = ntohs (be->header.size);
+ uint16_t size = ntohs (be->header.size) - sizeof (*be);
+ const struct GNUNET_MessageHeader *inbox =
+ (const struct GNUNET_MessageHeader *) &be[1];
+ const char *is;
+ uint16_t isize;
(void) cls;
- if ((size - sizeof (*be)) <
- (sizeof (struct TransportBackchannelRequestPayloadP) +
- sizeof (struct GNUNET_MessageHeader)))
+ if (ntohs (inbox->size) >= size)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ isize = ntohs (inbox->size);
+ is = ((const char *) inbox) + isize;
+ size -= isize;
+ if ('\0' != is[size - 1])
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
/**
- * We received the plaintext @a msg from backtalker @a b. Forward
- * it to the respective communicator.
+ * Communicator gave us a backchannel encapsulation. Process the request.
+ * (We are the destination of the backchannel here.)
*
- * @param b a backtalker
- * @param msg a message, consisting of a `struct GNUNET_MessageHeader`
- * followed by the target name of the communicator
- * @param msg_size number of bytes in @a msg
+ * @param cls a `struct CommunicatorMessageContext` (must call
+ * #finish_cmc_handling() when done)
+ * @param be the message that was received
*/
static void
-forward_backchannel_payload (struct Backtalker *b,
- const void *msg,
- size_t msg_size)
+handle_backchannel_encapsulation (
+ void *cls,
+ const struct TransportBackchannelEncapsulationMessage *be)
{
+ struct CommunicatorMessageContext *cmc = cls;
struct GNUNET_TRANSPORT_CommunicatorBackchannelIncoming *cbi;
struct GNUNET_MQ_Envelope *env;
struct TransportClient *tc;
- const struct GNUNET_MessageHeader *mh;
- const char *target_communicator;
- uint16_t mhs;
+ const struct GNUNET_MessageHeader *inbox =
+ (const struct GNUNET_MessageHeader *) &be[1];
+ uint16_t isize = ntohs (inbox->size);
+ const char *target_communicator = ((const char *) inbox) + isize;
- /* Determine target_communicator and check @a msg is well-formed */
- mh = msg;
- mhs = ntohs (mh->size);
- if (mhs <= msg_size)
- {
- GNUNET_break_op (0);
- return;
- }
- target_communicator = &((const char *) msg)[ntohs (mh->size)];
- if ('\0' != target_communicator[msg_size - mhs - 1])
- {
- GNUNET_break_op (0);
- return;
- }
/* Find client providing this communicator */
for (tc = clients_head; NULL != tc; tc = tc->next)
if ((CT_COMMUNICATOR == tc->type) &&
/* Finally, deliver backchannel message to communicator */
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Delivering backchannel message from %s of type %u to %s\n",
- GNUNET_i2s (&b->pid),
- ntohs (mh->type),
+ GNUNET_i2s (&cmc->im.sender),
+ ntohs (inbox->type),
target_communicator);
env = GNUNET_MQ_msg_extra (
cbi,
- msg_size,
+ isize,
GNUNET_MESSAGE_TYPE_TRANSPORT_COMMUNICATOR_BACKCHANNEL_INCOMING);
- cbi->pid = b->pid;
- memcpy (&cbi[1], msg, msg_size);
+ cbi->pid = cmc->im.sender;
+ memcpy (&cbi[1], inbox, isize);
GNUNET_MQ_send (tc->mq, env);
}
/**
- * Free data structures associated with @a b.
+ * Task called when we should check if any of the DV paths
+ * we have learned to a target are due for garbage collection.
*
- * @param b data structure to release
+ * Collects stale paths, and possibly frees the entire DV
+ * entry if no paths are left. Otherwise re-schedules itself.
+ *
+ * @param cls a `struct DistanceVector`
*/
static void
-free_backtalker (struct Backtalker *b)
+path_cleanup_cb (void *cls)
{
- if (NULL != b->get)
- {
- GNUNET_PEERSTORE_iterate_cancel (b->get);
- b->get = NULL;
- GNUNET_assert (NULL != b->cmc);
- finish_cmc_handling (b->cmc);
- b->cmc = NULL;
- }
- if (NULL != b->task)
+ struct DistanceVector *dv = cls;
+ struct DistanceVectorHop *pos;
+
+ dv->timeout_task = NULL;
+ while (NULL != (pos = dv->dv_head))
{
- GNUNET_SCHEDULER_cancel (b->task);
- b->task = NULL;
+ GNUNET_assert (dv == pos->dv);
+ if (GNUNET_TIME_absolute_get_remaining (pos->timeout).rel_value_us > 0)
+ break;
+ free_distance_vector_hop (pos);
}
- if (NULL != b->sc)
+ if (NULL == pos)
{
- GNUNET_PEERSTORE_store_cancel (b->sc);
- b->sc = NULL;
+ free_dv_route (dv);
+ return;
}
- GNUNET_assert (
- GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_remove (backtalkers, &b->pid, b));
- GNUNET_free (b);
-}
-
-
-/**
- * Callback to free backtalker records.
- *
- * @param cls NULL
- * @param pid unused
- * @param value a `struct Backtalker`
- * @return #GNUNET_OK (always)
- */
-static int
-free_backtalker_cb (void *cls,
- const struct GNUNET_PeerIdentity *pid,
- void *value)
-{
- struct Backtalker *b = value;
-
- (void) cls;
- (void) pid;
- free_backtalker (b);
- return GNUNET_OK;
+ dv->timeout_task =
+ GNUNET_SCHEDULER_add_at (pos->timeout, &path_cleanup_cb, dv);
}
/**
- * Function called when it is time to clean up a backtalker.
+ * The @a hop is a validated path to the respective target
+ * peer and we should tell core about it -- and schedule
+ * a job to revoke the state.
*
- * @param cls a `struct Backtalker`
+ * @param hop a path to some peer that is the reason for activation
*/
static void
-backtalker_timeout_cb (void *cls)
+activate_core_visible_dv_path (struct DistanceVectorHop *hop)
{
- struct Backtalker *b = cls;
+ struct DistanceVector *dv = hop->dv;
+ struct VirtualLink *vl;
- b->task = NULL;
- if (0 != GNUNET_TIME_absolute_get_remaining (b->timeout).rel_value_us)
+ vl = lookup_virtual_link (&dv->target);
+ if (NULL != vl)
{
- b->task = GNUNET_SCHEDULER_add_at (b->timeout, &backtalker_timeout_cb, b);
+ /* Link was already up, remember dv is also now available and we are done */
+ vl->dv = dv;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Virtual link to %s could now also use DV!\n",
+ GNUNET_i2s (&dv->target));
return;
}
- GNUNET_assert (NULL == b->sc);
- free_backtalker (b);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Creating new virtual link to %s using DV!\n",
+ GNUNET_i2s (&dv->target));
+ vl = GNUNET_new (struct VirtualLink);
+ vl->message_uuid_ctr =
+ GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK, UINT64_MAX);
+ vl->target = dv->target;
+ vl->dv = dv;
+ dv->vl = vl;
+ vl->core_recv_window = RECV_WINDOW_SIZE;
+ vl->available_fc_window_size = DEFAULT_WINDOW_SIZE;
+ vl->visibility_task =
+ GNUNET_SCHEDULER_add_at (hop->path_valid_until, &check_link_down, vl);
+ GNUNET_break (GNUNET_YES ==
+ GNUNET_CONTAINER_multipeermap_put (
+ links,
+ &vl->target,
+ vl,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
+ /* We lacked a confirmed connection to the target
+ before, so tell CORE about it (finally!) */
+ cores_send_connect_info (&dv->target);
}
/**
- * Function called with the monotonic time of a backtalker
- * by PEERSTORE. Updates the time and continues processing.
+ * We have learned a @a path through the network to some other peer, add it to
+ * our DV data structure (returning #GNUNET_YES on success).
*
- * @param cls a `struct Backtalker`
- * @param record the information found, NULL for the last call
- * @param emsg error message
+ * We do not add paths if we have a sufficient number of shorter
+ * paths to this target already (returning #GNUNET_NO).
+ *
+ * We also do not add problematic paths, like those where we lack the first
+ * hop in our neighbour list (i.e. due to a topology change) or where some
+ * non-first hop is in our neighbour list (returning #GNUNET_SYSERR).
+ *
+ * @param path the path we learned, path[0] should be us,
+ * and then path contains a valid path from us to
+ * `path[path_len-1]` path[1] should be a direct neighbour (we should check!)
+ * @param path_len number of entries on the @a path, at least three!
+ * @param network_latency how long does the message take from us to
+ * `path[path_len-1]`? set to "forever" if unknown
+ * @param path_valid_until how long is this path considered validated? Maybe
+ * be zero.
+ * @return #GNUNET_YES on success,
+ * #GNUNET_NO if we have better path(s) to the target
+ * #GNUNET_SYSERR if the path is useless and/or invalid
+ * (i.e. path[1] not a direct neighbour
+ * or path[i+1] is a direct neighbour for i>0)
*/
-static void
-backtalker_monotime_cb (void *cls,
- const struct GNUNET_PEERSTORE_Record *record,
- const char *emsg)
+static int
+learn_dv_path (const struct GNUNET_PeerIdentity *path,
+ unsigned int path_len,
+ struct GNUNET_TIME_Relative network_latency,
+ struct GNUNET_TIME_Absolute path_valid_until)
{
- struct Backtalker *b = cls;
- struct GNUNET_TIME_AbsoluteNBO *mtbe;
- struct GNUNET_TIME_Absolute mt;
+ struct DistanceVectorHop *hop;
+ struct DistanceVector *dv;
+ struct Neighbour *next_hop;
+ unsigned int shorter_distance;
- (void) emsg;
- if (NULL == record)
- {
- /* we're done with #backtalker_monotime_cb() invocations,
- continue normal processing */
- b->get = NULL;
- GNUNET_assert (NULL != b->cmc);
- finish_cmc_handling (b->cmc);
- b->cmc = NULL;
- if (0 != b->body_size)
- forward_backchannel_payload (b, &b[1], b->body_size);
- return;
- }
- if (sizeof (*mtbe) != record->value_size)
+ if (path_len < 3)
{
+ /* what a boring path! not allowed! */
GNUNET_break (0);
- return;
+ return GNUNET_SYSERR;
}
- mtbe = record->value;
- mt = GNUNET_TIME_absolute_ntoh (*mtbe);
- if (mt.abs_value_us > b->monotonic_time.abs_value_us)
+ GNUNET_assert (0 == GNUNET_memcmp (&GST_my_identity, &path[0]));
+ next_hop = lookup_neighbour (&path[1]);
+ if (NULL == next_hop)
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Backtalker message from %s dropped, monotime in the past\n",
- GNUNET_i2s (&b->pid));
- GNUNET_STATISTICS_update (
- GST_stats,
- "# Backchannel messages dropped: monotonic time not increasing",
- 1,
- GNUNET_NO);
- b->monotonic_time = mt;
- /* Setting body_size to 0 prevents call to #forward_backchannel_payload()
- */
- b->body_size = 0;
- return;
+ /* next hop must be a neighbour, otherwise this whole thing is useless! */
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
}
-}
-
+ for (unsigned int i = 2; i < path_len; i++)
+ if (NULL != lookup_neighbour (&path[i]))
+ {
+ /* Useless path: we have a direct connection to some hop
+ in the middle of the path, so this one is not even
+ terribly useful for redundancy */
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "Path of %u hops useless: directly link to hop %u (%s)\n",
+ path_len,
+ i,
+ GNUNET_i2s (&path[i]));
+ GNUNET_STATISTICS_update (GST_stats,
+ "# Useless DV path ignored: hop is neighbour",
+ 1,
+ GNUNET_NO);
+ return GNUNET_SYSERR;
+ }
+ dv = GNUNET_CONTAINER_multipeermap_get (dv_routes, &path[path_len - 1]);
+ if (NULL == dv)
+ {
+ dv = GNUNET_new (struct DistanceVector);
+ dv->target = path[path_len - 1];
+ dv->timeout_task = GNUNET_SCHEDULER_add_delayed (DV_PATH_VALIDITY_TIMEOUT,
+ &path_cleanup_cb,
+ dv);
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONTAINER_multipeermap_put (
+ dv_routes,
+ &dv->target,
+ dv,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
+ }
+ /* Check if we have this path already! */
+ shorter_distance = 0;
+ for (struct DistanceVectorHop *pos = dv->dv_head; NULL != pos;
+ pos = pos->next_dv)
+ {
+ if (pos->distance < path_len - 2)
+ shorter_distance++;
+ /* Note that the distances in 'pos' excludes us (path[0]) and
+ the next_hop (path[1]), so we need to subtract two
+ and check next_hop explicitly */
+ if ((pos->distance == path_len - 2) && (pos->next_hop == next_hop))
+ {
+ int match = GNUNET_YES;
-/**
- * Function called by PEERSTORE when the store operation of
- * a backtalker's monotonic time is complete.
- *
- * @param cls the `struct Backtalker`
- * @param success #GNUNET_OK on success
- */
-static void
-backtalker_monotime_store_cb (void *cls, int success)
-{
- struct Backtalker *b = cls;
+ for (unsigned int i = 0; i < pos->distance; i++)
+ {
+ if (0 != GNUNET_memcmp (&pos->path[i], &path[i + 2]))
+ {
+ match = GNUNET_NO;
+ break;
+ }
+ }
+ if (GNUNET_YES == match)
+ {
+ struct GNUNET_TIME_Relative last_timeout;
- if (GNUNET_OK != success)
+ /* Re-discovered known path, update timeout */
+ GNUNET_STATISTICS_update (GST_stats,
+ "# Known DV path refreshed",
+ 1,
+ GNUNET_NO);
+ last_timeout = GNUNET_TIME_absolute_get_remaining (pos->timeout);
+ pos->timeout =
+ GNUNET_TIME_relative_to_absolute (DV_PATH_VALIDITY_TIMEOUT);
+ pos->path_valid_until =
+ GNUNET_TIME_absolute_max (pos->path_valid_until, path_valid_until);
+ GNUNET_CONTAINER_MDLL_remove (dv, dv->dv_head, dv->dv_tail, pos);
+ GNUNET_CONTAINER_MDLL_insert (dv, dv->dv_head, dv->dv_tail, pos);
+ if (0 <
+ GNUNET_TIME_absolute_get_remaining (path_valid_until).rel_value_us)
+ activate_core_visible_dv_path (pos);
+ if (last_timeout.rel_value_us <
+ GNUNET_TIME_relative_subtract (DV_PATH_VALIDITY_TIMEOUT,
+ DV_PATH_DISCOVERY_FREQUENCY)
+ .rel_value_us)
+ {
+ /* Some peer send DV learn messages too often, we are learning
+ the same path faster than it would be useful; do not forward! */
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "Rediscovered path too quickly, not forwarding further\n");
+ return GNUNET_NO;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Refreshed known path to %s, forwarding further\n",
+ GNUNET_i2s (&dv->target));
+ return GNUNET_YES;
+ }
+ }
+ }
+ /* Count how many shorter paths we have (incl. direct
+ neighbours) before simply giving up on this one! */
+ if (shorter_distance >= MAX_DV_PATHS_TO_TARGET)
{
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "Failed to store backtalker's monotonic time in PEERSTORE!\n");
+ /* We have a shorter path already! */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Have many shorter DV paths %s, not forwarding further\n",
+ GNUNET_i2s (&dv->target));
+ return GNUNET_NO;
}
- b->sc = NULL;
- b->task = GNUNET_SCHEDULER_add_at (b->timeout, &backtalker_timeout_cb, b);
+ /* create new DV path entry */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Discovered new DV path to %s\n",
+ GNUNET_i2s (&dv->target));
+ hop = GNUNET_malloc (sizeof (struct DistanceVectorHop) +
+ sizeof (struct GNUNET_PeerIdentity) * (path_len - 2));
+ hop->next_hop = next_hop;
+ hop->dv = dv;
+ hop->path = (const struct GNUNET_PeerIdentity *) &hop[1];
+ memcpy (&hop[1],
+ &path[2],
+ sizeof (struct GNUNET_PeerIdentity) * (path_len - 2));
+ hop->timeout = GNUNET_TIME_relative_to_absolute (DV_PATH_VALIDITY_TIMEOUT);
+ hop->path_valid_until = path_valid_until;
+ hop->distance = path_len - 2;
+ hop->pd.aged_rtt = network_latency;
+ GNUNET_CONTAINER_MDLL_insert (dv, dv->dv_head, dv->dv_tail, hop);
+ GNUNET_CONTAINER_MDLL_insert (neighbour,
+ next_hop->dv_head,
+ next_hop->dv_tail,
+ hop);
+ if (0 < GNUNET_TIME_absolute_get_remaining (path_valid_until).rel_value_us)
+ activate_core_visible_dv_path (hop);
+ return GNUNET_YES;
}
/**
- * The backtalker @a b monotonic time changed. Update PEERSTORE.
+ * Communicator gave us a DV learn message. Check the message.
*
- * @param b a backtalker with updated monotonic time
+ * @param cls a `struct CommunicatorMessageContext`
+ * @param dvl the send message that was sent
+ * @return #GNUNET_YES if message is well-formed
*/
-static void
-update_backtalker_monotime (struct Backtalker *b)
+static int
+check_dv_learn (void *cls, const struct TransportDVLearnMessage *dvl)
{
- struct GNUNET_TIME_AbsoluteNBO mtbe;
+ uint16_t size = ntohs (dvl->header.size);
+ uint16_t num_hops = ntohs (dvl->num_hops);
+ const struct DVPathEntryP *hops = (const struct DVPathEntryP *) &dvl[1];
- if (NULL != b->sc)
+ (void) cls;
+ if (size != sizeof (*dvl) + num_hops * sizeof (struct DVPathEntryP))
{
- GNUNET_PEERSTORE_store_cancel (b->sc);
- b->sc = NULL;
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
}
- else
+ if (num_hops > MAX_DV_HOPS_ALLOWED)
{
- GNUNET_SCHEDULER_cancel (b->task);
- b->task = NULL;
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
}
- mtbe = GNUNET_TIME_absolute_hton (b->monotonic_time);
- b->sc =
- GNUNET_PEERSTORE_store (peerstore,
- "transport",
- &b->pid,
- GNUNET_PEERSTORE_TRANSPORT_BACKCHANNEL_MONOTIME,
- &mtbe,
- sizeof (mtbe),
- GNUNET_TIME_UNIT_FOREVER_ABS,
- GNUNET_PEERSTORE_STOREOPTION_REPLACE,
- &backtalker_monotime_store_cb,
- b);
+ for (unsigned int i = 0; i < num_hops; i++)
+ {
+ if (0 == GNUNET_memcmp (&dvl->initiator, &hops[i].hop))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ if (0 == GNUNET_memcmp (&GST_my_identity, &hops[i].hop))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ }
+ return GNUNET_YES;
}
/**
- * Communicator gave us a backchannel encapsulation. Process the request.
- * (We are not the origin of the backchannel here, the communicator simply
- * received a backchannel message and we are expected to forward it.)
+ * Build and forward a DV learn message to @a next_hop.
*
- * @param cls a `struct CommunicatorMessageContext` (must call
- * #finish_cmc_handling() when done)
- * @param be the message that was received
+ * @param next_hop peer to send the message to
+ * @param msg message received
+ * @param bi_history bitmask specifying hops on path that were bidirectional
+ * @param nhops length of the @a hops array
+ * @param hops path the message traversed so far
+ * @param in_time when did we receive the message, used to calculate network
+ * delay
*/
static void
-handle_backchannel_encapsulation (
- void *cls,
- const struct TransportBackchannelEncapsulationMessage *be)
+forward_dv_learn (const struct GNUNET_PeerIdentity *next_hop,
+ const struct TransportDVLearnMessage *msg,
+ uint16_t bi_history,
+ uint16_t nhops,
+ const struct DVPathEntryP *hops,
+ struct GNUNET_TIME_Absolute in_time)
{
- struct CommunicatorMessageContext *cmc = cls;
- struct BackchannelKeyState key;
- struct GNUNET_HashCode hmac;
- const char *hdr;
- size_t hdr_len;
+ struct DVPathEntryP *dhops;
+ char buf[sizeof (struct TransportDVLearnMessage) +
+ (nhops + 1) * sizeof (struct DVPathEntryP)] GNUNET_ALIGN;
+ struct TransportDVLearnMessage *fwd = (struct TransportDVLearnMessage *) buf;
+ struct GNUNET_TIME_Relative nnd;
- if (0 != GNUNET_memcmp (&be->target, &GST_my_identity))
+ /* compute message for forwarding */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Forwarding DV learn message originating from %s to %s\n",
+ GNUNET_i2s (&msg->initiator),
+ GNUNET_i2s2 (next_hop));
+ GNUNET_assert (nhops < MAX_DV_HOPS_ALLOWED);
+ fwd->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DV_LEARN);
+ fwd->header.size = htons (sizeof (struct TransportDVLearnMessage) +
+ (nhops + 1) * sizeof (struct DVPathEntryP));
+ fwd->num_hops = htons (nhops + 1);
+ fwd->bidirectional = htons (bi_history);
+ nnd = GNUNET_TIME_relative_add (GNUNET_TIME_absolute_get_duration (in_time),
+ GNUNET_TIME_relative_ntoh (
+ msg->non_network_delay));
+ fwd->non_network_delay = GNUNET_TIME_relative_hton (nnd);
+ fwd->init_sig = msg->init_sig;
+ fwd->initiator = msg->initiator;
+ fwd->challenge = msg->challenge;
+ dhops = (struct DVPathEntryP *) &fwd[1];
+ GNUNET_memcpy (dhops, hops, sizeof (struct DVPathEntryP) * nhops);
+ dhops[nhops].hop = GST_my_identity;
{
- /* not for me, try to route to target */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Forwarding backtalk to %s\n",
- GNUNET_i2s (&be->target));
- route_message (&be->target,
- GNUNET_copy_message (&be->header),
- RMO_DV_ALLOWED);
- finish_cmc_handling (cmc);
- return;
- }
- /* FIXME: this should be done when decrypting _any_ DV
- message, not only for backchannels! */
- dh_key_derive_eph_pub (&be->ephemeral_key, &be->iv, &key);
- hdr = (const char *) &be[1];
- hdr_len = ntohs (be->header.size) - sizeof (*be);
- bc_hmac (&key, &hmac, hdr, hdr_len);
- if (0 != GNUNET_memcmp (&hmac, &be->hmac))
- {
- /* HMAC missmatch, disard! */
- GNUNET_break_op (0);
- finish_cmc_handling (cmc);
- return;
- }
- /* begin actual decryption */
- {
- struct Backtalker *b;
- struct GNUNET_TIME_Absolute monotime;
- struct TransportBackchannelRequestPayloadP ppay;
- char body[hdr_len - sizeof (ppay)];
-
- GNUNET_assert (hdr_len >=
- sizeof (ppay) + sizeof (struct GNUNET_MessageHeader));
- bc_decrypt (&key, &ppay, hdr, sizeof (ppay));
- bc_decrypt (&key, &body, &hdr[sizeof (ppay)], hdr_len - sizeof (ppay));
- bc_key_clean (&key);
- monotime = GNUNET_TIME_absolute_ntoh (ppay.monotonic_time);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Decrypted backtalk from %s\n",
- GNUNET_i2s (&ppay.sender));
- b = GNUNET_CONTAINER_multipeermap_get (backtalkers, &ppay.sender);
- if ((NULL != b) && (monotime.abs_value_us < b->monotonic_time.abs_value_us))
- {
- GNUNET_STATISTICS_update (
- GST_stats,
- "# Backchannel messages dropped: monotonic time not increasing",
- 1,
- GNUNET_NO);
- finish_cmc_handling (cmc);
- return;
- }
- if ((NULL == b) ||
- (0 != GNUNET_memcmp (&b->last_ephemeral, &be->ephemeral_key)))
- {
- /* Check signature */
- struct EphemeralConfirmationPS ec;
-
- ec.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_EPHEMERAL);
- ec.purpose.size = htonl (sizeof (ec));
- ec.target = GST_my_identity;
- ec.ephemeral_key = be->ephemeral_key;
- if (
- GNUNET_OK !=
- GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_EPHEMERAL,
- &ec.purpose,
- &ppay.sender_sig,
- &ppay.sender.public_key))
- {
- /* Signature invalid, disard! */
- GNUNET_break_op (0);
- finish_cmc_handling (cmc);
- return;
- }
- }
- if (NULL != b)
- {
- /* update key cache and mono time */
- b->last_ephemeral = be->ephemeral_key;
- b->monotonic_time = monotime;
- update_backtalker_monotime (b);
- forward_backchannel_payload (b, body, sizeof (body));
- b->timeout =
- GNUNET_TIME_relative_to_absolute (BACKCHANNEL_INACTIVITY_TIMEOUT);
- finish_cmc_handling (cmc);
- return;
- }
- /* setup data structure to cache signature AND check
- monotonic time with PEERSTORE before forwarding backchannel payload */
- b = GNUNET_malloc (sizeof (struct Backtalker) + sizeof (body));
- b->pid = ppay.sender;
- b->body_size = sizeof (body);
- memcpy (&b[1], body, sizeof (body));
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_put (
- backtalkers,
- &b->pid,
- b,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
- b->monotonic_time = monotime; /* NOTE: to be checked still! */
- b->cmc = cmc;
- b->timeout =
- GNUNET_TIME_relative_to_absolute (BACKCHANNEL_INACTIVITY_TIMEOUT);
- b->task = GNUNET_SCHEDULER_add_at (b->timeout, &backtalker_timeout_cb, b);
- b->get =
- GNUNET_PEERSTORE_iterate (peerstore,
- "transport",
- &b->pid,
- GNUNET_PEERSTORE_TRANSPORT_BACKCHANNEL_MONOTIME,
- &backtalker_monotime_cb,
- b);
+ struct DvHopPS dhp = {.purpose.purpose =
+ htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DV_HOP),
+ .purpose.size = htonl (sizeof (dhp)),
+ .pred = dhops[nhops - 1].hop,
+ .succ = *next_hop,
+ .challenge = msg->challenge};
+
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CRYPTO_eddsa_sign (GST_my_private_key,
+ &dhp.purpose,
+ &dhops[nhops].hop_sig));
}
+ route_message (next_hop, &fwd->header, RMO_UNCONFIRMED_ALLOWED);
}
/**
- * Task called when we should check if any of the DV paths
- * we have learned to a target are due for garbage collection.
- *
- * Collects stale paths, and possibly frees the entire DV
- * entry if no paths are left. Otherwise re-schedules itself.
+ * Check signature of type #GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DV_INITIATOR
*
- * @param cls a `struct DistanceVector`
+ * @param sender_monotonic_time monotonic time of the initiator
+ * @param init the signer
+ * @param challenge the challenge that was signed
+ * @param init_sig signature presumably by @a init
+ * @return #GNUNET_OK if the signature is valid
*/
-static void
-path_cleanup_cb (void *cls)
+static int
+validate_dv_initiator_signature (
+ struct GNUNET_TIME_AbsoluteNBO sender_monotonic_time,
+ const struct GNUNET_PeerIdentity *init,
+ const struct ChallengeNonceP *challenge,
+ const struct GNUNET_CRYPTO_EddsaSignature *init_sig)
{
- struct DistanceVector *dv = cls;
- struct DistanceVectorHop *pos;
+ struct DvInitPS ip = {.purpose.purpose = htonl (
+ GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DV_INITIATOR),
+ .purpose.size = htonl (sizeof (ip)),
+ .monotonic_time = sender_monotonic_time,
+ .challenge = *challenge};
- dv->timeout_task = NULL;
- while (NULL != (pos = dv->dv_head))
- {
- GNUNET_assert (dv == pos->dv);
- if (GNUNET_TIME_absolute_get_remaining (pos->timeout).rel_value_us > 0)
- break;
- free_distance_vector_hop (pos);
- }
- if (NULL == pos)
+ if (
+ GNUNET_OK !=
+ GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DV_INITIATOR,
+ &ip.purpose,
+ init_sig,
+ &init->public_key))
{
- free_dv_route (dv);
- return;
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
}
- dv->timeout_task =
- GNUNET_SCHEDULER_add_at (pos->timeout, &path_cleanup_cb, dv);
+ return GNUNET_OK;
}
/**
- * The @a hop is a validated path to the respective target
- * peer and we should tell core about it -- and schedule
- * a job to revoke the state.
- *
- * @param hop a path to some peer that is the reason for activation
+ * Closure for #dv_neighbour_selection and #dv_neighbour_transmission.
*/
-static void
-activate_core_visible_dv_path (struct DistanceVectorHop *hop)
+struct NeighbourSelectionContext
{
- struct DistanceVector *dv = hop->dv;
- struct VirtualLink *vl;
+ /**
+ * Original message we received.
+ */
+ const struct TransportDVLearnMessage *dvl;
- vl = GNUNET_CONTAINER_multipeermap_get (links, &dv->target);
- if (NULL != vl)
- {
- /* Link was already up, remember dv is also now available and we are done */
- vl->dv = dv;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Virtual link to %s could now also use DV!\n",
- GNUNET_i2s (&dv->target));
- return;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Creating new virtual link to %s using DV!\n",
- GNUNET_i2s (&dv->target));
- vl = GNUNET_new (struct VirtualLink);
- vl->target = dv->target;
- vl->dv = dv;
- vl->core_recv_window = RECV_WINDOW_SIZE;
- vl->visibility_task =
- GNUNET_SCHEDULER_add_at (hop->path_valid_until, &check_link_down, vl);
- GNUNET_break (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_put (
- links,
- &vl->target,
- vl,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
- /* We lacked a confirmed connection to the target
- before, so tell CORE about it (finally!) */
- cores_send_connect_info (&dv->target);
-}
+ /**
+ * The hops taken.
+ */
+ const struct DVPathEntryP *hops;
+
+ /**
+ * Time we received the message.
+ */
+ struct GNUNET_TIME_Absolute in_time;
+
+ /**
+ * Offsets of the selected peers.
+ */
+ uint32_t selections[MAX_DV_DISCOVERY_SELECTION];
+
+ /**
+ * Number of peers eligible for selection.
+ */
+ unsigned int num_eligible;
+
+ /**
+ * Number of peers that were selected for forwarding.
+ */
+ unsigned int num_selections;
+
+ /**
+ * Number of hops in @e hops
+ */
+ uint16_t nhops;
+
+ /**
+ * Bitmap of bidirectional connections encountered.
+ */
+ uint16_t bi_history;
+};
/**
- * We have learned a @a path through the network to some other peer, add it to
- * our DV data structure (returning #GNUNET_YES on success).
- *
- * We do not add paths if we have a sufficient number of shorter
- * paths to this target already (returning #GNUNET_NO).
- *
- * We also do not add problematic paths, like those where we lack the first
- * hop in our neighbour list (i.e. due to a topology change) or where some
- * non-first hop is in our neighbour list (returning #GNUNET_SYSERR).
+ * Function called for each neighbour during #handle_dv_learn.
*
- * @param path the path we learned, path[0] should be us,
- * and then path contains a valid path from us to
- * `path[path_len-1]` path[1] should be a direct neighbour (we should check!)
- * @param path_len number of entries on the @a path, at least three!
- * @param network_latency how long does the message take from us to
- * `path[path_len-1]`? set to "forever" if unknown
- * @param path_valid_until how long is this path considered validated? Maybe
- * be zero.
- * @return #GNUNET_YES on success,
- * #GNUNET_NO if we have better path(s) to the target
- * #GNUNET_SYSERR if the path is useless and/or invalid
- * (i.e. path[1] not a direct neighbour
- * or path[i+1] is a direct neighbour for i>0)
+ * @param cls a `struct NeighbourSelectionContext *`
+ * @param pid identity of the peer
+ * @param value a `struct Neighbour`
+ * @return #GNUNET_YES (always)
*/
static int
-learn_dv_path (const struct GNUNET_PeerIdentity *path,
- unsigned int path_len,
- struct GNUNET_TIME_Relative network_latency,
- struct GNUNET_TIME_Absolute path_valid_until)
+dv_neighbour_selection (void *cls,
+ const struct GNUNET_PeerIdentity *pid,
+ void *value)
{
- struct DistanceVectorHop *hop;
- struct DistanceVector *dv;
- struct Neighbour *next_hop;
- unsigned int shorter_distance;
+ struct NeighbourSelectionContext *nsc = cls;
- if (path_len < 3)
- {
- /* what a boring path! not allowed! */
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- GNUNET_assert (0 == GNUNET_memcmp (&GST_my_identity, &path[0]));
- next_hop = lookup_neighbour (&path[1]);
- if (NULL == next_hop)
+ (void) value;
+ if (0 == GNUNET_memcmp (pid, &nsc->dvl->initiator))
+ return GNUNET_YES; /* skip initiator */
+ for (unsigned int i = 0; i < nsc->nhops; i++)
+ if (0 == GNUNET_memcmp (pid, &nsc->hops[i].hop))
+ return GNUNET_YES; /* skip peers on path */
+ nsc->num_eligible++;
+ return GNUNET_YES;
+}
+
+
+/**
+ * Function called for each neighbour during #handle_dv_learn.
+ * We call #forward_dv_learn() on the neighbour(s) selected
+ * during #dv_neighbour_selection().
+ *
+ * @param cls a `struct NeighbourSelectionContext *`
+ * @param pid identity of the peer
+ * @param value a `struct Neighbour`
+ * @return #GNUNET_YES (always)
+ */
+static int
+dv_neighbour_transmission (void *cls,
+ const struct GNUNET_PeerIdentity *pid,
+ void *value)
+{
+ struct NeighbourSelectionContext *nsc = cls;
+
+ (void) value;
+ if (0 == GNUNET_memcmp (pid, &nsc->dvl->initiator))
+ return GNUNET_YES; /* skip initiator */
+ for (unsigned int i = 0; i < nsc->nhops; i++)
+ if (0 == GNUNET_memcmp (pid, &nsc->hops[i].hop))
+ return GNUNET_YES; /* skip peers on path */
+ for (unsigned int i = 0; i < nsc->num_selections; i++)
+ {
+ if (nsc->selections[i] == nsc->num_eligible)
+ {
+ forward_dv_learn (pid,
+ nsc->dvl,
+ nsc->bi_history,
+ nsc->nhops,
+ nsc->hops,
+ nsc->in_time);
+ break;
+ }
+ }
+ nsc->num_eligible++;
+ return GNUNET_YES;
+}
+
+
+/**
+ * Computes the number of neighbours we should forward a DVInit
+ * message to given that it has so far taken @a hops_taken hops
+ * though the network and that the number of neighbours we have
+ * in total is @a neighbour_count, out of which @a eligible_count
+ * are not yet on the path.
+ *
+ * NOTE: technically we might want to include NSE in the formula to
+ * get a better grip on the overall network size. However, for now
+ * using NSE here would create a dependency issue in the build system.
+ * => Left for later, hardcoded to 50 for now.
+ *
+ * The goal of the fomula is that we want to reach a total of LOG(NSE)
+ * peers via DV (`target_total`). We want the reach to be spread out
+ * over various distances to the origin, with a bias towards shorter
+ * distances.
+ *
+ * We make the strong assumption that the network topology looks
+ * "similar" at other hops, in particular the @a neighbour_count
+ * should be comparable at other hops.
+ *
+ * If the local neighbourhood is densely connected, we expect that @a
+ * eligible_count is close to @a neighbour_count minus @a hops_taken
+ * as a lot of the path is already known. In that case, we should
+ * forward to few(er) peers to try to find a path out of the
+ * neighbourhood. OTOH, if @a eligible_count is close to @a
+ * neighbour_count, we should forward to many peers as we are either
+ * still close to the origin (i.e. @a hops_taken is small) or because
+ * we managed to get beyond a local cluster. We express this as
+ * the `boost_factor` using the square of the fraction of eligible
+ * neighbours (so if only 50% are eligible, we boost by 1/4, but if
+ * 99% are eligible, the 'boost' will be almost 1).
+ *
+ * Second, the more hops we have taken, the larger the problem of an
+ * exponential traffic explosion gets. So we take the `target_total`,
+ * and compute our degree such that at each distance d 2^{-d} peers
+ * are selected (corrected by the `boost_factor`).
+ *
+ * @param hops_taken number of hops DVInit has travelled so far
+ * @param neighbour_count number of neighbours we have in total
+ * @param eligible_count number of neighbours we could in
+ * theory forward to
+ */
+static unsigned int
+calculate_fork_degree (unsigned int hops_taken,
+ unsigned int neighbour_count,
+ unsigned int eligible_count)
+{
+ double target_total = 50.0; /* FIXME: use LOG(NSE)? */
+ double eligible_ratio =
+ ((double) eligible_count) / ((double) neighbour_count);
+ double boost_factor = eligible_ratio * eligible_ratio;
+ unsigned int rnd;
+ double left;
+
+ if (hops_taken >= 64)
{
- /* next hop must be a neighbour, otherwise this whole thing is useless! */
GNUNET_break (0);
- return GNUNET_SYSERR;
+ return 0; /* precaution given bitshift below */
}
- for (unsigned int i = 2; i < path_len; i++)
- if (NULL != lookup_neighbour (&path[i]))
+ for (unsigned int i = 1; i < hops_taken; i++)
+ {
+ /* For each hop, subtract the expected number of targets
+ reached at distance d (so what remains divided by 2^d) */
+ target_total -= (target_total * boost_factor / (1LLU << i));
+ }
+ rnd =
+ (unsigned int) floor (target_total * boost_factor / (1LLU << hops_taken));
+ /* round up or down probabilistically depending on how close we were
+ when floor()ing to rnd */
+ left = target_total - (double) rnd;
+ if (UINT32_MAX * left >
+ GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK, UINT32_MAX))
+ rnd++; /* round up */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Forwarding DV learn message of %u hops %u(/%u/%u) times\n",
+ hops_taken,
+ rnd,
+ eligible_count,
+ neighbour_count);
+ return rnd;
+}
+
+
+/**
+ * Function called when peerstore is done storing a DV monotonic time.
+ *
+ * @param cls a `struct Neighbour`
+ * @param success #GNUNET_YES if peerstore was successful
+ */
+static void
+neighbour_store_dvmono_cb (void *cls, int success)
+{
+ struct Neighbour *n = cls;
+
+ n->sc = NULL;
+ if (GNUNET_YES != success)
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Failed to store other peer's monotonic time in peerstore!\n");
+}
+
+
+/**
+ * Communicator gave us a DV learn message. Process the request.
+ *
+ * @param cls a `struct CommunicatorMessageContext` (must call
+ * #finish_cmc_handling() when done)
+ * @param dvl the message that was received
+ */
+static void
+handle_dv_learn (void *cls, const struct TransportDVLearnMessage *dvl)
+{
+ struct CommunicatorMessageContext *cmc = cls;
+ enum GNUNET_TRANSPORT_CommunicatorCharacteristics cc;
+ int bi_hop;
+ uint16_t nhops;
+ uint16_t bi_history;
+ const struct DVPathEntryP *hops;
+ int do_fwd;
+ int did_initiator;
+ struct GNUNET_TIME_Absolute in_time;
+ struct Neighbour *n;
+
+ nhops = ntohs (dvl->bidirectional); /* 0 = sender is initiator */
+ bi_history = ntohs (dvl->bidirectional);
+ hops = (const struct DVPathEntryP *) &dvl[1];
+ if (0 == nhops)
+ {
+ /* sanity check */
+ if (0 != GNUNET_memcmp (&dvl->initiator, &cmc->im.sender))
+ {
+ GNUNET_break (0);
+ finish_cmc_handling (cmc);
+ return;
+ }
+ }
+ else
+ {
+ /* sanity check */
+ if (0 != GNUNET_memcmp (&hops[nhops - 1].hop, &cmc->im.sender))
+ {
+ GNUNET_break (0);
+ finish_cmc_handling (cmc);
+ return;
+ }
+ }
+
+ GNUNET_assert (CT_COMMUNICATOR == cmc->tc->type);
+ cc = cmc->tc->details.communicator.cc;
+ bi_hop = (GNUNET_TRANSPORT_CC_RELIABLE ==
+ cc); // FIXME: add bi-directional flag to cc?
+ in_time = GNUNET_TIME_absolute_get ();
+
+ /* continue communicator here, everything else can happen asynchronous! */
+ finish_cmc_handling (cmc);
+
+ n = lookup_neighbour (&dvl->initiator);
+ if (NULL != n)
+ {
+ if ((n->dv_monotime_available == GNUNET_YES) &&
+ (GNUNET_TIME_absolute_ntoh (dvl->monotonic_time).abs_value_us <
+ n->last_dv_learn_monotime.abs_value_us))
{
- /* Useless path: we have a direct connection to some hop
- in the middle of the path, so this one is not even
- terribly useful for redundancy */
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "Path of %u hops useless: directly link to hop %u (%s)\n",
- path_len,
- i,
- GNUNET_i2s (&path[i]));
GNUNET_STATISTICS_update (GST_stats,
- "# Useless DV path ignored: hop is neighbour",
+ "# DV learn discarded due to time travel",
1,
GNUNET_NO);
- return GNUNET_SYSERR;
+ return;
}
- dv = GNUNET_CONTAINER_multipeermap_get (dv_routes, &path[path_len - 1]);
- if (NULL == dv)
+ if (GNUNET_OK != validate_dv_initiator_signature (dvl->monotonic_time,
+ &dvl->initiator,
+ &dvl->challenge,
+ &dvl->init_sig))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ n->last_dv_learn_monotime = GNUNET_TIME_absolute_ntoh (dvl->monotonic_time);
+ if (GNUNET_YES == n->dv_monotime_available)
+ {
+ if (NULL != n->sc)
+ GNUNET_PEERSTORE_store_cancel (n->sc);
+ n->sc =
+ GNUNET_PEERSTORE_store (peerstore,
+ "transport",
+ &dvl->initiator,
+ GNUNET_PEERSTORE_TRANSPORT_DVLEARN_MONOTIME,
+ &dvl->monotonic_time,
+ sizeof (dvl->monotonic_time),
+ GNUNET_TIME_UNIT_FOREVER_ABS,
+ GNUNET_PEERSTORE_STOREOPTION_REPLACE,
+ &neighbour_store_dvmono_cb,
+ n);
+ }
+ }
+ /* OPTIMIZE-FIXME: asynchronously (!) verify signatures!,
+ If signature verification load too high, implement random drop strategy */
+ for (unsigned int i = 0; i < nhops; i++)
{
- dv = GNUNET_new (struct DistanceVector);
- dv->target = path[path_len - 1];
- dv->timeout_task = GNUNET_SCHEDULER_add_delayed (DV_PATH_VALIDITY_TIMEOUT,
- &path_cleanup_cb,
- dv);
- GNUNET_assert (GNUNET_OK ==
- GNUNET_CONTAINER_multipeermap_put (
- dv_routes,
- &dv->target,
- dv,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
+ struct DvHopPS dhp = {.purpose.purpose =
+ htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DV_HOP),
+ .purpose.size = htonl (sizeof (dhp)),
+ .pred = (0 == i) ? dvl->initiator : hops[i - 1].hop,
+ .succ = (nhops == i + 1) ? GST_my_identity
+ : hops[i + 1].hop,
+ .challenge = dvl->challenge};
+
+ if (GNUNET_OK !=
+ GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DV_HOP,
+ &dhp.purpose,
+ &hops[i].hop_sig,
+ &hops[i].hop.public_key))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
}
- /* Check if we have this path already! */
- shorter_distance = 0;
- for (struct DistanceVectorHop *pos = dv->dv_head; NULL != pos;
- pos = pos->next_dv)
+
+ if (GNUNET_EXTRA_LOGGING > 0)
{
- if (pos->distance < path_len - 2)
- shorter_distance++;
- /* Note that the distances in 'pos' excludes us (path[0]) and
- the next_hop (path[1]), so we need to subtract two
- and check next_hop explicitly */
- if ((pos->distance == path_len - 2) && (pos->next_hop == next_hop))
+ char *path;
+
+ path = GNUNET_strdup (GNUNET_i2s (&dvl->initiator));
+ for (unsigned int i = 0; i < nhops; i++)
{
- int match = GNUNET_YES;
+ char *tmp;
- for (unsigned int i = 0; i < pos->distance; i++)
+ GNUNET_asprintf (&tmp,
+ "%s%s%s",
+ path,
+ (bi_history & (1 << (nhops - i))) ? "<->" : "-->",
+ GNUNET_i2s (&hops[i].hop));
+ GNUNET_free (path);
+ path = tmp;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received DVInit via %s%s%s\n",
+ path,
+ bi_hop ? "<->" : "-->",
+ GNUNET_i2s (&GST_my_identity));
+ GNUNET_free (path);
+ }
+
+ do_fwd = GNUNET_YES;
+ if (0 == GNUNET_memcmp (&GST_my_identity, &dvl->initiator))
+ {
+ struct GNUNET_PeerIdentity path[nhops + 1];
+ struct GNUNET_TIME_Relative host_latency_sum;
+ struct GNUNET_TIME_Relative latency;
+ struct GNUNET_TIME_Relative network_latency;
+
+ /* We initiated this, learn the forward path! */
+ path[0] = GST_my_identity;
+ path[1] = hops[0].hop;
+ host_latency_sum = GNUNET_TIME_relative_ntoh (dvl->non_network_delay);
+
+ // Need also something to lookup initiation time
+ // to compute RTT! -> add RTT argument here?
+ latency = GNUNET_TIME_UNIT_FOREVER_REL; // FIXME: initialize properly
+ // (based on dvl->challenge, we can identify time of origin!)
+
+ network_latency = GNUNET_TIME_relative_subtract (latency, host_latency_sum);
+ /* assumption: latency on all links is the same */
+ network_latency = GNUNET_TIME_relative_divide (network_latency, nhops);
+
+ for (unsigned int i = 2; i <= nhops; i++)
+ {
+ struct GNUNET_TIME_Relative ilat;
+
+ /* assumption: linear latency increase per hop */
+ ilat = GNUNET_TIME_relative_multiply (network_latency, i);
+ path[i] = hops[i - 1].hop;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Learned path with %u hops to %s with latency %s\n",
+ i,
+ GNUNET_i2s (&path[i]),
+ GNUNET_STRINGS_relative_time_to_string (ilat, GNUNET_YES));
+ learn_dv_path (path,
+ i,
+ ilat,
+ GNUNET_TIME_relative_to_absolute (
+ ADDRESS_VALIDATION_LIFETIME));
+ }
+ /* as we initiated, do not forward again (would be circular!) */
+ do_fwd = GNUNET_NO;
+ return;
+ }
+ if (bi_hop)
+ {
+ /* last hop was bi-directional, we could learn something here! */
+ struct GNUNET_PeerIdentity path[nhops + 2];
+
+ path[0] = GST_my_identity;
+ path[1] = hops[nhops - 1].hop; /* direct neighbour == predecessor! */
+ for (unsigned int i = 0; i < nhops; i++)
+ {
+ int iret;
+
+ if (0 == (bi_history & (1 << i)))
+ break; /* i-th hop not bi-directional, stop learning! */
+ if (i == nhops)
{
- if (0 != GNUNET_memcmp (&pos->path[i], &path[i + 2]))
- {
- match = GNUNET_NO;
- break;
- }
+ path[i + 2] = dvl->initiator;
}
- if (GNUNET_YES == match)
+ else
{
- struct GNUNET_TIME_Relative last_timeout;
+ path[i + 2] = hops[nhops - i - 2].hop;
+ }
- /* Re-discovered known path, update timeout */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Learned inverse path with %u hops to %s\n",
+ i + 1,
+ GNUNET_i2s (&path[i + 2]));
+ iret = learn_dv_path (path,
+ i + 2,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ GNUNET_TIME_UNIT_ZERO_ABS);
+ if (GNUNET_SYSERR == iret)
+ {
+ /* path invalid or too long to be interesting for US, thus should also
+ not be interesting to our neighbours, cut path when forwarding to
+ 'i' hops, except of course for the one that goes back to the
+ initiator */
GNUNET_STATISTICS_update (GST_stats,
- "# Known DV path refreshed",
+ "# DV learn not forwarded due invalidity of path",
1,
GNUNET_NO);
- last_timeout = GNUNET_TIME_absolute_get_remaining (pos->timeout);
- pos->timeout =
- GNUNET_TIME_relative_to_absolute (DV_PATH_VALIDITY_TIMEOUT);
- pos->path_valid_until =
- GNUNET_TIME_absolute_max (pos->path_valid_until, path_valid_until);
- GNUNET_CONTAINER_MDLL_remove (dv, dv->dv_head, dv->dv_tail, pos);
- GNUNET_CONTAINER_MDLL_insert (dv, dv->dv_head, dv->dv_tail, pos);
- if (0 <
- GNUNET_TIME_absolute_get_remaining (path_valid_until).rel_value_us)
- activate_core_visible_dv_path (pos);
- if (last_timeout.rel_value_us <
- GNUNET_TIME_relative_subtract (DV_PATH_VALIDITY_TIMEOUT,
- DV_PATH_DISCOVERY_FREQUENCY)
- .rel_value_us)
- {
- /* Some peer send DV learn messages too often, we are learning
- the same path faster than it would be useful; do not forward! */
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "Rediscovered path too quickly, not forwarding further\n");
- return GNUNET_NO;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Refreshed known path to %s, forwarding further\n",
- GNUNET_i2s (&dv->target));
- return GNUNET_YES;
+ do_fwd = GNUNET_NO;
+ break;
+ }
+ if ((GNUNET_NO == iret) && (nhops == i + 1))
+ {
+ /* we have better paths, and this is the longest target,
+ so there cannot be anything interesting later */
+ GNUNET_STATISTICS_update (GST_stats,
+ "# DV learn not forwarded, got better paths",
+ 1,
+ GNUNET_NO);
+ do_fwd = GNUNET_NO;
+ break;
}
}
}
- /* Count how many shorter paths we have (incl. direct
- neighbours) before simply giving up on this one! */
- if (shorter_distance >= MAX_DV_PATHS_TO_TARGET)
+
+ if (MAX_DV_HOPS_ALLOWED == nhops)
+ {
+ /* At limit, we're out of here! */
+ finish_cmc_handling (cmc);
+ return;
+ }
+
+ /* Forward to initiator, if path non-trivial and possible */
+ bi_history = (bi_history << 1) | (bi_hop ? 1 : 0);
+ did_initiator = GNUNET_NO;
+ if ((1 < nhops) &&
+ (GNUNET_YES ==
+ GNUNET_CONTAINER_multipeermap_contains (neighbours, &dvl->initiator)))
+ {
+ /* send back to origin! */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending DVL back to initiator %s\n",
+ GNUNET_i2s (&dvl->initiator));
+ forward_dv_learn (&dvl->initiator, dvl, bi_history, nhops, hops, in_time);
+ did_initiator = GNUNET_YES;
+ }
+ /* We forward under two conditions: either we still learned something
+ ourselves (do_fwd), or the path was darn short and thus the initiator is
+ likely to still be very interested in this (and we did NOT already
+ send it back to the initiator) */
+ if ((do_fwd) || ((nhops < MIN_DV_PATH_LENGTH_FOR_INITIATOR) &&
+ (GNUNET_NO == did_initiator)))
{
- /* We have a shorter path already! */
+ /* Pick random neighbours that are not yet on the path */
+ struct NeighbourSelectionContext nsc;
+ unsigned int n_cnt;
+
+ n_cnt = GNUNET_CONTAINER_multipeermap_size (neighbours);
+ nsc.nhops = nhops;
+ nsc.dvl = dvl;
+ nsc.bi_history = bi_history;
+ nsc.hops = hops;
+ nsc.in_time = in_time;
+ nsc.num_eligible = 0;
+ GNUNET_CONTAINER_multipeermap_iterate (neighbours,
+ &dv_neighbour_selection,
+ &nsc);
+ if (0 == nsc.num_eligible)
+ return; /* done here, cannot forward to anyone else */
+ nsc.num_selections = calculate_fork_degree (nhops, n_cnt, nsc.num_eligible);
+ nsc.num_selections =
+ GNUNET_MIN (MAX_DV_DISCOVERY_SELECTION, nsc.num_selections);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Have many shorter DV paths %s, not forwarding further\n",
- GNUNET_i2s (&dv->target));
- return GNUNET_NO;
+ "Forwarding DVL to %u other peers\n",
+ nsc.num_selections);
+ for (unsigned int i = 0; i < nsc.num_selections; i++)
+ nsc.selections[i] =
+ (nsc.num_selections == n_cnt)
+ ? i /* all were selected, avoid collisions by chance */
+ : GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, n_cnt);
+ nsc.num_eligible = 0;
+ GNUNET_CONTAINER_multipeermap_iterate (neighbours,
+ &dv_neighbour_transmission,
+ &nsc);
}
- /* create new DV path entry */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Discovered new DV path to %s\n",
- GNUNET_i2s (&dv->target));
- hop = GNUNET_malloc (sizeof (struct DistanceVectorHop) +
- sizeof (struct GNUNET_PeerIdentity) * (path_len - 2));
- hop->next_hop = next_hop;
- hop->dv = dv;
- hop->path = (const struct GNUNET_PeerIdentity *) &hop[1];
- memcpy (&hop[1],
- &path[2],
- sizeof (struct GNUNET_PeerIdentity) * (path_len - 2));
- hop->timeout = GNUNET_TIME_relative_to_absolute (DV_PATH_VALIDITY_TIMEOUT);
- hop->path_valid_until = path_valid_until;
- hop->distance = path_len - 2;
- hop->pd.aged_rtt = network_latency;
- GNUNET_CONTAINER_MDLL_insert (dv, dv->dv_head, dv->dv_tail, hop);
- GNUNET_CONTAINER_MDLL_insert (neighbour,
- next_hop->dv_head,
- next_hop->dv_tail,
- hop);
- if (0 < GNUNET_TIME_absolute_get_remaining (path_valid_until).rel_value_us)
- activate_core_visible_dv_path (hop);
- return GNUNET_YES;
}
/**
- * Communicator gave us a DV learn message. Check the message.
+ * Communicator gave us a DV box. Check the message.
*
* @param cls a `struct CommunicatorMessageContext`
- * @param dvl the send message that was sent
+ * @param dvb the send message that was sent
* @return #GNUNET_YES if message is well-formed
*/
static int
-check_dv_learn (void *cls, const struct TransportDVLearnMessage *dvl)
+check_dv_box (void *cls, const struct TransportDVBoxMessage *dvb)
{
- uint16_t size = ntohs (dvl->header.size);
- uint16_t num_hops = ntohs (dvl->num_hops);
- const struct DVPathEntryP *hops = (const struct DVPathEntryP *) &dvl[1];
+ uint16_t size = ntohs (dvb->header.size);
+ uint16_t num_hops = ntohs (dvb->num_hops);
+ const struct GNUNET_PeerIdentity *hops =
+ (const struct GNUNET_PeerIdentity *) &dvb[1];
(void) cls;
- if (size != sizeof (*dvl) + num_hops * sizeof (struct DVPathEntryP))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- if (num_hops > MAX_DV_HOPS_ALLOWED)
+ if (size < sizeof (*dvb) + num_hops * sizeof (struct GNUNET_PeerIdentity) +
+ sizeof (struct GNUNET_MessageHeader))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
+ /* This peer must not be on the path */
for (unsigned int i = 0; i < num_hops; i++)
- {
- if (0 == GNUNET_memcmp (&dvl->initiator, &hops[i].hop))
+ if (0 == GNUNET_memcmp (&hops[i], &GST_my_identity))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
- if (0 == GNUNET_memcmp (&GST_my_identity, &hops[i].hop))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- }
return GNUNET_YES;
}
/**
- * Build and forward a DV learn message to @a next_hop.
+ * Create a DV Box message and queue it for transmission to
+ * @ea next_hop.
*
- * @param next_hop peer to send the message to
- * @param msg message received
- * @param bi_history bitmask specifying hops on path that were bidirectional
- * @param nhops length of the @a hops array
- * @param hops path the message traversed so far
- * @param in_time when did we receive the message, used to calculate network
- * delay
+ * @param next_hop peer to receive the message next
+ * @param total_hops how many hops did the message take so far
+ * @param num_hops length of the @a hops array
+ * @param origin origin of the message
+ * @param hops next peer(s) to the destination, including destination
+ * @param payload payload of the box
+ * @param payload_size number of bytes in @a payload
*/
static void
-forward_dv_learn (const struct GNUNET_PeerIdentity *next_hop,
- const struct TransportDVLearnMessage *msg,
- uint16_t bi_history,
- uint16_t nhops,
- const struct DVPathEntryP *hops,
- struct GNUNET_TIME_Absolute in_time)
+forward_dv_box (struct Neighbour *next_hop,
+ const struct TransportDVBoxMessage *hdr,
+ uint16_t total_hops,
+ uint16_t num_hops,
+ const struct GNUNET_PeerIdentity *hops,
+ const void *enc_payload,
+ uint16_t enc_payload_size)
{
- struct DVPathEntryP *dhops;
- struct TransportDVLearnMessage *fwd;
- struct GNUNET_TIME_Relative nnd;
-
- /* compute message for forwarding */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Forwarding DV learn message originating from %s to %s\n",
- GNUNET_i2s (&msg->initiator),
- GNUNET_i2s2 (next_hop));
- GNUNET_assert (nhops < MAX_DV_HOPS_ALLOWED);
- fwd = GNUNET_malloc (sizeof (struct TransportDVLearnMessage) +
- (nhops + 1) * sizeof (struct DVPathEntryP));
- fwd->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DV_LEARN);
- fwd->header.size = htons (sizeof (struct TransportDVLearnMessage) +
- (nhops + 1) * sizeof (struct DVPathEntryP));
- fwd->num_hops = htons (nhops + 1);
- fwd->bidirectional = htons (bi_history);
- nnd = GNUNET_TIME_relative_add (GNUNET_TIME_absolute_get_duration (in_time),
- GNUNET_TIME_relative_ntoh (
- msg->non_network_delay));
- fwd->non_network_delay = GNUNET_TIME_relative_hton (nnd);
- fwd->init_sig = msg->init_sig;
- fwd->initiator = msg->initiator;
- fwd->challenge = msg->challenge;
- dhops = (struct DVPathEntryP *) &fwd[1];
- GNUNET_memcpy (dhops, hops, sizeof (struct DVPathEntryP) * nhops);
- dhops[nhops].hop = GST_my_identity;
- {
- struct DvHopPS dhp = {.purpose.purpose =
- htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DV_HOP),
- .purpose.size = htonl (sizeof (dhp)),
- .pred = dhops[nhops - 1].hop,
- .succ = *next_hop,
- .challenge = msg->challenge};
+ char buf[sizeof (struct TransportDVBoxMessage) +
+ num_hops * sizeof (struct GNUNET_PeerIdentity) + enc_payload_size];
+ struct GNUNET_PeerIdentity *dhops =
+ (struct GNUNET_PeerIdentity *) &buf[sizeof (struct TransportDVBoxMessage)];
- GNUNET_assert (GNUNET_OK ==
- GNUNET_CRYPTO_eddsa_sign (GST_my_private_key,
- &dhp.purpose,
- &dhops[nhops].hop_sig));
- }
- route_message (next_hop, &fwd->header, RMO_UNCONFIRMED_ALLOWED);
+ memcpy (buf, hdr, sizeof (*hdr));
+ memcpy (dhops, hops, num_hops * sizeof (struct GNUNET_PeerIdentity));
+ memcpy (&dhops[num_hops], enc_payload, enc_payload_size);
+ route_message (&next_hop->pid,
+ (const struct GNUNET_MessageHeader *) buf,
+ RMO_NONE);
}
/**
- * Check signature of type #GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DV_INITIATOR
+ * Free data structures associated with @a b.
*
- * @param sender_monotonic_time monotonic time of the initiator
- * @param init the signer
- * @param challenge the challenge that was signed
- * @param init_sig signature presumably by @a init
- * @return #GNUNET_OK if the signature is valid
- */
-static int
-validate_dv_initiator_signature (
- struct GNUNET_TIME_AbsoluteNBO sender_monotonic_time,
- const struct GNUNET_PeerIdentity *init,
- const struct ChallengeNonceP *challenge,
- const struct GNUNET_CRYPTO_EddsaSignature *init_sig)
-{
- struct DvInitPS ip = {.purpose.purpose = htonl (
- GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DV_INITIATOR),
- .purpose.size = htonl (sizeof (ip)),
- .monotonic_time = sender_monotonic_time,
- .challenge = *challenge};
-
- if (
- GNUNET_OK !=
- GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DV_INITIATOR,
- &ip.purpose,
- init_sig,
- &init->public_key))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- return GNUNET_OK;
-}
-
-
-/**
- * Closure for #dv_neighbour_selection and #dv_neighbour_transmission.
+ * @param b data structure to release
*/
-struct NeighbourSelectionContext
-{
- /**
- * Original message we received.
- */
- const struct TransportDVLearnMessage *dvl;
-
- /**
- * The hops taken.
- */
- const struct DVPathEntryP *hops;
-
- /**
- * Time we received the message.
- */
- struct GNUNET_TIME_Absolute in_time;
-
- /**
- * Offsets of the selected peers.
- */
- uint32_t selections[MAX_DV_DISCOVERY_SELECTION];
-
- /**
- * Number of peers eligible for selection.
- */
- unsigned int num_eligible;
-
- /**
- * Number of peers that were selected for forwarding.
- */
- unsigned int num_selections;
-
- /**
- * Number of hops in @e hops
- */
- uint16_t nhops;
-
- /**
- * Bitmap of bidirectional connections encountered.
- */
- uint16_t bi_history;
-};
+static void
+free_backtalker (struct Backtalker *b)
+{
+ if (NULL != b->get)
+ {
+ GNUNET_PEERSTORE_iterate_cancel (b->get);
+ b->get = NULL;
+ GNUNET_assert (NULL != b->cmc);
+ finish_cmc_handling (b->cmc);
+ b->cmc = NULL;
+ }
+ if (NULL != b->task)
+ {
+ GNUNET_SCHEDULER_cancel (b->task);
+ b->task = NULL;
+ }
+ if (NULL != b->sc)
+ {
+ GNUNET_PEERSTORE_store_cancel (b->sc);
+ b->sc = NULL;
+ }
+ GNUNET_assert (
+ GNUNET_YES ==
+ GNUNET_CONTAINER_multipeermap_remove (backtalkers, &b->pid, b));
+ GNUNET_free (b);
+}
/**
- * Function called for each neighbour during #handle_dv_learn.
+ * Callback to free backtalker records.
*
- * @param cls a `struct NeighbourSelectionContext *`
- * @param pid identity of the peer
- * @param value a `struct Neighbour`
- * @return #GNUNET_YES (always)
+ * @param cls NULL
+ * @param pid unused
+ * @param value a `struct Backtalker`
+ * @return #GNUNET_OK (always)
*/
static int
-dv_neighbour_selection (void *cls,
- const struct GNUNET_PeerIdentity *pid,
- void *value)
+free_backtalker_cb (void *cls,
+ const struct GNUNET_PeerIdentity *pid,
+ void *value)
{
- struct NeighbourSelectionContext *nsc = cls;
+ struct Backtalker *b = value;
- (void) value;
- if (0 == GNUNET_memcmp (pid, &nsc->dvl->initiator))
- return GNUNET_YES; /* skip initiator */
- for (unsigned int i = 0; i < nsc->nhops; i++)
- if (0 == GNUNET_memcmp (pid, &nsc->hops[i].hop))
- return GNUNET_YES; /* skip peers on path */
- nsc->num_eligible++;
- return GNUNET_YES;
+ (void) cls;
+ (void) pid;
+ free_backtalker (b);
+ return GNUNET_OK;
}
/**
- * Function called for each neighbour during #handle_dv_learn.
- * We call #forward_dv_learn() on the neighbour(s) selected
- * during #dv_neighbour_selection().
+ * Function called when it is time to clean up a backtalker.
*
- * @param cls a `struct NeighbourSelectionContext *`
- * @param pid identity of the peer
- * @param value a `struct Neighbour`
- * @return #GNUNET_YES (always)
+ * @param cls a `struct Backtalker`
*/
-static int
-dv_neighbour_transmission (void *cls,
- const struct GNUNET_PeerIdentity *pid,
- void *value)
+static void
+backtalker_timeout_cb (void *cls)
{
- struct NeighbourSelectionContext *nsc = cls;
+ struct Backtalker *b = cls;
- (void) value;
- if (0 == GNUNET_memcmp (pid, &nsc->dvl->initiator))
- return GNUNET_YES; /* skip initiator */
- for (unsigned int i = 0; i < nsc->nhops; i++)
- if (0 == GNUNET_memcmp (pid, &nsc->hops[i].hop))
- return GNUNET_YES; /* skip peers on path */
- for (unsigned int i = 0; i < nsc->num_selections; i++)
+ b->task = NULL;
+ if (0 != GNUNET_TIME_absolute_get_remaining (b->timeout).rel_value_us)
{
- if (nsc->selections[i] == nsc->num_eligible)
- {
- forward_dv_learn (pid,
- nsc->dvl,
- nsc->bi_history,
- nsc->nhops,
- nsc->hops,
- nsc->in_time);
- break;
- }
+ b->task = GNUNET_SCHEDULER_add_at (b->timeout, &backtalker_timeout_cb, b);
+ return;
}
- nsc->num_eligible++;
- return GNUNET_YES;
+ GNUNET_assert (NULL == b->sc);
+ free_backtalker (b);
}
/**
- * Computes the number of neighbours we should forward a DVInit
- * message to given that it has so far taken @a hops_taken hops
- * though the network and that the number of neighbours we have
- * in total is @a neighbour_count, out of which @a eligible_count
- * are not yet on the path.
- *
- * NOTE: technically we might want to include NSE in the formula to
- * get a better grip on the overall network size. However, for now
- * using NSE here would create a dependency issue in the build system.
- * => Left for later, hardcoded to 50 for now.
- *
- * The goal of the fomula is that we want to reach a total of LOG(NSE)
- * peers via DV (`target_total`). We want the reach to be spread out
- * over various distances to the origin, with a bias towards shorter
- * distances.
- *
- * We make the strong assumption that the network topology looks
- * "similar" at other hops, in particular the @a neighbour_count
- * should be comparable at other hops.
- *
- * If the local neighbourhood is densely connected, we expect that @a
- * eligible_count is close to @a neighbour_count minus @a hops_taken
- * as a lot of the path is already known. In that case, we should
- * forward to few(er) peers to try to find a path out of the
- * neighbourhood. OTOH, if @a eligible_count is close to @a
- * neighbour_count, we should forward to many peers as we are either
- * still close to the origin (i.e. @a hops_taken is small) or because
- * we managed to get beyond a local cluster. We express this as
- * the `boost_factor` using the square of the fraction of eligible
- * neighbours (so if only 50% are eligible, we boost by 1/4, but if
- * 99% are eligible, the 'boost' will be almost 1).
- *
- * Second, the more hops we have taken, the larger the problem of an
- * exponential traffic explosion gets. So we take the `target_total`,
- * and compute our degree such that at each distance d 2^{-d} peers
- * are selected (corrected by the `boost_factor`).
+ * Function called with the monotonic time of a backtalker
+ * by PEERSTORE. Updates the time and continues processing.
*
- * @param hops_taken number of hops DVInit has travelled so far
- * @param neighbour_count number of neighbours we have in total
- * @param eligible_count number of neighbours we could in
- * theory forward to
+ * @param cls a `struct Backtalker`
+ * @param record the information found, NULL for the last call
+ * @param emsg error message
*/
-static unsigned int
-calculate_fork_degree (unsigned int hops_taken,
- unsigned int neighbour_count,
- unsigned int eligible_count)
+static void
+backtalker_monotime_cb (void *cls,
+ const struct GNUNET_PEERSTORE_Record *record,
+ const char *emsg)
{
- double target_total = 50.0; /* FIXME: use LOG(NSE)? */
- double eligible_ratio =
- ((double) eligible_count) / ((double) neighbour_count);
- double boost_factor = eligible_ratio * eligible_ratio;
- unsigned int rnd;
- double left;
+ struct Backtalker *b = cls;
+ struct GNUNET_TIME_AbsoluteNBO *mtbe;
+ struct GNUNET_TIME_Absolute mt;
- if (hops_taken >= 64)
+ (void) emsg;
+ if (NULL == record)
+ {
+ /* we're done with #backtalker_monotime_cb() invocations,
+ continue normal processing */
+ b->get = NULL;
+ GNUNET_assert (NULL != b->cmc);
+ if (0 != b->body_size)
+ demultiplex_with_cmc (b->cmc,
+ (const struct GNUNET_MessageHeader *) &b[1]);
+ else
+ finish_cmc_handling (b->cmc);
+ b->cmc = NULL;
+ return;
+ }
+ if (sizeof (*mtbe) != record->value_size)
{
GNUNET_break (0);
- return 0; /* precaution given bitshift below */
+ return;
}
- for (unsigned int i = 1; i < hops_taken; i++)
+ mtbe = record->value;
+ mt = GNUNET_TIME_absolute_ntoh (*mtbe);
+ if (mt.abs_value_us > b->monotonic_time.abs_value_us)
{
- /* For each hop, subtract the expected number of targets
- reached at distance d (so what remains divided by 2^d) */
- target_total -= (target_total * boost_factor / (1LLU << i));
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Backtalker message from %s dropped, monotime in the past\n",
+ GNUNET_i2s (&b->pid));
+ GNUNET_STATISTICS_update (
+ GST_stats,
+ "# Backchannel messages dropped: monotonic time not increasing",
+ 1,
+ GNUNET_NO);
+ b->monotonic_time = mt;
+ /* Setting body_size to 0 prevents call to #forward_backchannel_payload()
+ */
+ b->body_size = 0;
+ return;
}
- rnd =
- (unsigned int) floor (target_total * boost_factor / (1LLU << hops_taken));
- /* round up or down probabilistically depending on how close we were
- when floor()ing to rnd */
- left = target_total - (double) rnd;
- if (UINT32_MAX * left >
- GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK, UINT32_MAX))
- rnd++; /* round up */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Forwarding DV learn message of %u hops %u(/%u/%u) times\n",
- hops_taken,
- rnd,
- eligible_count,
- neighbour_count);
- return rnd;
}
/**
- * Function called when peerstore is done storing a DV monotonic time.
+ * Function called by PEERSTORE when the store operation of
+ * a backtalker's monotonic time is complete.
*
- * @param cls a `struct Neighbour`
- * @param success #GNUNET_YES if peerstore was successful
+ * @param cls the `struct Backtalker`
+ * @param success #GNUNET_OK on success
*/
static void
-neighbour_store_dvmono_cb (void *cls, int success)
+backtalker_monotime_store_cb (void *cls, int success)
{
- struct Neighbour *n = cls;
+ struct Backtalker *b = cls;
- n->sc = NULL;
- if (GNUNET_YES != success)
+ if (GNUNET_OK != success)
+ {
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "Failed to store other peer's monotonic time in peerstore!\n");
+ "Failed to store backtalker's monotonic time in PEERSTORE!\n");
+ }
+ b->sc = NULL;
+ b->task = GNUNET_SCHEDULER_add_at (b->timeout, &backtalker_timeout_cb, b);
+}
+
+
+/**
+ * The backtalker @a b monotonic time changed. Update PEERSTORE.
+ *
+ * @param b a backtalker with updated monotonic time
+ */
+static void
+update_backtalker_monotime (struct Backtalker *b)
+{
+ struct GNUNET_TIME_AbsoluteNBO mtbe;
+
+ if (NULL != b->sc)
+ {
+ GNUNET_PEERSTORE_store_cancel (b->sc);
+ b->sc = NULL;
+ }
+ else
+ {
+ GNUNET_SCHEDULER_cancel (b->task);
+ b->task = NULL;
+ }
+ mtbe = GNUNET_TIME_absolute_hton (b->monotonic_time);
+ b->sc =
+ GNUNET_PEERSTORE_store (peerstore,
+ "transport",
+ &b->pid,
+ GNUNET_PEERSTORE_TRANSPORT_BACKCHANNEL_MONOTIME,
+ &mtbe,
+ sizeof (mtbe),
+ GNUNET_TIME_UNIT_FOREVER_ABS,
+ GNUNET_PEERSTORE_STOREOPTION_REPLACE,
+ &backtalker_monotime_store_cb,
+ b);
}
/**
- * Communicator gave us a DV learn message. Process the request.
+ * Communicator gave us a DV box. Process the request.
*
* @param cls a `struct CommunicatorMessageContext` (must call
* #finish_cmc_handling() when done)
- * @param dvl the message that was received
+ * @param dvb the message that was received
*/
static void
-handle_dv_learn (void *cls, const struct TransportDVLearnMessage *dvl)
+handle_dv_box (void *cls, const struct TransportDVBoxMessage *dvb)
{
struct CommunicatorMessageContext *cmc = cls;
- enum GNUNET_TRANSPORT_CommunicatorCharacteristics cc;
- int bi_hop;
- uint16_t nhops;
- uint16_t bi_history;
- const struct DVPathEntryP *hops;
- int do_fwd;
- int did_initiator;
- struct GNUNET_TIME_Absolute in_time;
- struct Neighbour *n;
-
- nhops = ntohs (dvl->bidirectional); /* 0 = sender is initiator */
- bi_history = ntohs (dvl->bidirectional);
- hops = (const struct DVPathEntryP *) &dvl[1];
- if (0 == nhops)
- {
- /* sanity check */
- if (0 != GNUNET_memcmp (&dvl->initiator, &cmc->im.sender))
- {
- GNUNET_break (0);
- finish_cmc_handling (cmc);
- return;
- }
- }
- else
- {
- /* sanity check */
- if (0 != GNUNET_memcmp (&hops[nhops - 1].hop, &cmc->im.sender))
- {
- GNUNET_break (0);
- finish_cmc_handling (cmc);
- return;
- }
- }
-
- GNUNET_assert (CT_COMMUNICATOR == cmc->tc->type);
- cc = cmc->tc->details.communicator.cc;
- bi_hop = (GNUNET_TRANSPORT_CC_RELIABLE ==
- cc); // FIXME: add bi-directional flag to cc?
- in_time = GNUNET_TIME_absolute_get ();
-
- /* continue communicator here, everything else can happen asynchronous! */
- finish_cmc_handling (cmc);
-
- n = lookup_neighbour (&dvl->initiator);
- if (NULL != n)
- {
- if ((n->dv_monotime_available == GNUNET_YES) &&
- (GNUNET_TIME_absolute_ntoh (dvl->monotonic_time).abs_value_us <
- n->last_dv_learn_monotime.abs_value_us))
- {
- GNUNET_STATISTICS_update (GST_stats,
- "# DV learn discarded due to time travel",
- 1,
- GNUNET_NO);
- return;
- }
- if (GNUNET_OK != validate_dv_initiator_signature (dvl->monotonic_time,
- &dvl->initiator,
- &dvl->challenge,
- &dvl->init_sig))
- {
- GNUNET_break_op (0);
- return;
- }
- n->last_dv_learn_monotime = GNUNET_TIME_absolute_ntoh (dvl->monotonic_time);
- if (GNUNET_YES == n->dv_monotime_available)
- {
- if (NULL != n->sc)
- GNUNET_PEERSTORE_store_cancel (n->sc);
- n->sc =
- GNUNET_PEERSTORE_store (peerstore,
- "transport",
- &dvl->initiator,
- GNUNET_PEERSTORE_TRANSPORT_DVLEARN_MONOTIME,
- &dvl->monotonic_time,
- sizeof (dvl->monotonic_time),
- GNUNET_TIME_UNIT_FOREVER_ABS,
- GNUNET_PEERSTORE_STOREOPTION_REPLACE,
- &neighbour_store_dvmono_cb,
- n);
- }
- }
- /* OPTIMIZE-FIXME: asynchronously (!) verify signatures!,
- If signature verification load too high, implement random drop strategy */
- for (unsigned int i = 0; i < nhops; i++)
- {
- struct DvHopPS dhp = {.purpose.purpose =
- htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DV_HOP),
- .purpose.size = htonl (sizeof (dhp)),
- .pred = (0 == i) ? dvl->initiator : hops[i - 1].hop,
- .succ = (nhops - 1 == i) ? GST_my_identity
- : hops[i + 1].hop,
- .challenge = dvl->challenge};
-
- if (GNUNET_OK !=
- GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DV_HOP,
- &dhp.purpose,
- &hops[i].hop_sig,
- &hops[i].hop.public_key))
- {
- GNUNET_break_op (0);
- return;
- }
- }
+ uint16_t size = ntohs (dvb->header.size) - sizeof (*dvb);
+ uint16_t num_hops = ntohs (dvb->num_hops);
+ const struct GNUNET_PeerIdentity *hops =
+ (const struct GNUNET_PeerIdentity *) &dvb[1];
+ const char *enc_payload = (const char *) &hops[num_hops];
+ uint16_t enc_payload_size =
+ size - (num_hops * sizeof (struct GNUNET_PeerIdentity));
+ struct DVKeyState key;
+ struct GNUNET_HashCode hmac;
+ const char *hdr;
+ size_t hdr_len;
if (GNUNET_EXTRA_LOGGING > 0)
{
char *path;
- path = GNUNET_strdup (GNUNET_i2s (&dvl->initiator));
- for (unsigned int i = 0; i < nhops; i++)
+ path = GNUNET_strdup (GNUNET_i2s (&GST_my_identity));
+ for (unsigned int i = 0; i < num_hops; i++)
{
char *tmp;
- GNUNET_asprintf (&tmp,
- "%s%s%s",
- path,
- (bi_history & (1 << (nhops - i))) ? "<->" : "-->",
- GNUNET_i2s (&hops[i].hop));
+ GNUNET_asprintf (&tmp, "%s->%s", path, GNUNET_i2s (&hops[i]));
GNUNET_free (path);
path = tmp;
}
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received DVInit via %s%s%s\n",
- path,
- bi_hop ? "<->" : "-->",
- GNUNET_i2s (&GST_my_identity));
+ "Received DVBox with remainig path %s\n",
+ path);
GNUNET_free (path);
}
- do_fwd = GNUNET_YES;
- if (0 == GNUNET_memcmp (&GST_my_identity, &dvl->initiator))
- {
- struct GNUNET_PeerIdentity path[nhops + 1];
- struct GNUNET_TIME_Relative host_latency_sum;
- struct GNUNET_TIME_Relative latency;
- struct GNUNET_TIME_Relative network_latency;
-
- /* We initiated this, learn the forward path! */
- path[0] = GST_my_identity;
- path[1] = hops[0].hop;
- host_latency_sum = GNUNET_TIME_relative_ntoh (dvl->non_network_delay);
-
- // Need also something to lookup initiation time
- // to compute RTT! -> add RTT argument here?
- latency = GNUNET_TIME_UNIT_FOREVER_REL; // FIXME: initialize properly
- // (based on dvl->challenge, we can identify time of origin!)
-
- network_latency = GNUNET_TIME_relative_subtract (latency, host_latency_sum);
- /* assumption: latency on all links is the same */
- network_latency = GNUNET_TIME_relative_divide (network_latency, nhops);
-
- for (unsigned int i = 2; i <= nhops; i++)
- {
- struct GNUNET_TIME_Relative ilat;
-
- /* assumption: linear latency increase per hop */
- ilat = GNUNET_TIME_relative_multiply (network_latency, i);
- path[i] = hops[i - 1].hop;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Learned path with %u hops to %s with latency %s\n",
- i,
- GNUNET_i2s (&path[i]),
- GNUNET_STRINGS_relative_time_to_string (ilat, GNUNET_YES));
- learn_dv_path (path,
- i,
- ilat,
- GNUNET_TIME_relative_to_absolute (
- ADDRESS_VALIDATION_LIFETIME));
- }
- /* as we initiated, do not forward again (would be circular!) */
- do_fwd = GNUNET_NO;
- return;
- }
- if (bi_hop)
+ if (num_hops > 0)
{
- /* last hop was bi-directional, we could learn something here! */
- struct GNUNET_PeerIdentity path[nhops + 2];
-
- path[0] = GST_my_identity;
- path[1] = hops[nhops - 1].hop; /* direct neighbour == predecessor! */
- for (unsigned int i = 0; i < nhops; i++)
+ /* We're trying from the end of the hops array, as we may be
+ able to find a shortcut unknown to the origin that way */
+ for (int i = num_hops - 1; i >= 0; i--)
{
- int iret;
+ struct Neighbour *n;
- if (0 == (bi_history & (1 << i)))
- break; /* i-th hop not bi-directional, stop learning! */
- if (i == nhops)
- {
- path[i + 2] = dvl->initiator;
- }
- else
+ if (0 == GNUNET_memcmp (&hops[i], &GST_my_identity))
{
- path[i + 2] = hops[nhops - i - 2].hop;
+ GNUNET_break_op (0);
+ finish_cmc_handling (cmc);
+ return;
}
-
+ n = lookup_neighbour (&hops[i]);
+ if (NULL == n)
+ continue;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Learned inverse path with %u hops to %s\n",
- i + 1,
- GNUNET_i2s (&path[i + 2]));
- iret = learn_dv_path (path,
- i + 2,
- GNUNET_TIME_UNIT_FOREVER_REL,
- GNUNET_TIME_UNIT_ZERO_ABS);
- if (GNUNET_SYSERR == iret)
- {
- /* path invalid or too long to be interesting for US, thus should also
- not be interesting to our neighbours, cut path when forwarding to
- 'i' hops, except of course for the one that goes back to the
- initiator */
- GNUNET_STATISTICS_update (GST_stats,
- "# DV learn not forwarded due invalidity of path",
- 1,
- GNUNET_NO);
- do_fwd = GNUNET_NO;
- break;
- }
- if ((GNUNET_NO == iret) && (nhops == i + 1))
- {
- /* we have better paths, and this is the longest target,
- so there cannot be anything interesting later */
- GNUNET_STATISTICS_update (GST_stats,
- "# DV learn not forwarded, got better paths",
- 1,
- GNUNET_NO);
- do_fwd = GNUNET_NO;
- break;
- }
+ "Skipping %u/%u hops ahead while routing DV Box\n",
+ i,
+ num_hops);
+ forward_dv_box (n,
+ dvb,
+ ntohs (dvb->total_hops) + 1,
+ num_hops - i - 1, /* number of hops left */
+ &hops[i + 1], /* remaining hops */
+ enc_payload,
+ enc_payload_size);
+ GNUNET_STATISTICS_update (GST_stats,
+ "# DV hops skipped routing boxes",
+ i,
+ GNUNET_NO);
+ GNUNET_STATISTICS_update (GST_stats,
+ "# DV boxes routed (total)",
+ 1,
+ GNUNET_NO);
+ finish_cmc_handling (cmc);
+ return;
}
+ /* Woopsie, next hop not in neighbours, drop! */
+ GNUNET_STATISTICS_update (GST_stats,
+ "# DV Boxes dropped: next hop unknown",
+ 1,
+ GNUNET_NO);
+ finish_cmc_handling (cmc);
+ return;
}
+ /* We are the target. Unbox and handle message. */
+ GNUNET_STATISTICS_update (GST_stats,
+ "# DV boxes opened (ultimate target)",
+ 1,
+ GNUNET_NO);
+ cmc->total_hops = ntohs (dvb->total_hops);
- if (MAX_DV_HOPS_ALLOWED == nhops)
+ dh_key_derive_eph_pub (&dvb->ephemeral_key, &dvb->iv, &key);
+ hdr = (const char *) &dvb[1];
+ hdr_len = ntohs (dvb->header.size) - sizeof (*dvb);
+ dv_hmac (&key, &hmac, hdr, hdr_len);
+ if (0 != GNUNET_memcmp (&hmac, &dvb->hmac))
{
- /* At limit, we're out of here! */
+ /* HMAC missmatch, disard! */
+ GNUNET_break_op (0);
finish_cmc_handling (cmc);
return;
}
-
- /* Forward to initiator, if path non-trivial and possible */
- bi_history = (bi_history << 1) | (bi_hop ? 1 : 0);
- did_initiator = GNUNET_NO;
- if ((1 < nhops) &&
- (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_contains (neighbours, &dvl->initiator)))
+ /* begin actual decryption */
{
- /* send back to origin! */
+ struct Backtalker *b;
+ struct GNUNET_TIME_Absolute monotime;
+ struct TransportDVBoxPayloadP ppay;
+ char body[hdr_len - sizeof (ppay)] GNUNET_ALIGN;
+ const struct GNUNET_MessageHeader *mh =
+ (const struct GNUNET_MessageHeader *) body;
+
+ GNUNET_assert (hdr_len >=
+ sizeof (ppay) + sizeof (struct GNUNET_MessageHeader));
+ dv_decrypt (&key, &ppay, hdr, sizeof (ppay));
+ dv_decrypt (&key, &body, &hdr[sizeof (ppay)], hdr_len - sizeof (ppay));
+ dv_key_clean (&key);
+ if (ntohs (mh->size) != sizeof (body))
+ {
+ GNUNET_break_op (0);
+ finish_cmc_handling (cmc);
+ return;
+ }
+ /* need to prevent box-in-a-box (and DV_LEARN) so check inbox type! */
+ switch (ntohs (mh->type))
+ {
+ case GNUNET_MESSAGE_TYPE_TRANSPORT_DV_BOX:
+ GNUNET_break_op (0);
+ finish_cmc_handling (cmc);
+ return;
+ case GNUNET_MESSAGE_TYPE_TRANSPORT_DV_LEARN:
+ GNUNET_break_op (0);
+ finish_cmc_handling (cmc);
+ return;
+ default:
+ /* permitted, continue */
+ break;
+ }
+ monotime = GNUNET_TIME_absolute_ntoh (ppay.monotonic_time);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Sending DVL back to initiator %s\n",
- GNUNET_i2s (&dvl->initiator));
- forward_dv_learn (&dvl->initiator, dvl, bi_history, nhops, hops, in_time);
- did_initiator = GNUNET_YES;
- }
- /* We forward under two conditions: either we still learned something
- ourselves (do_fwd), or the path was darn short and thus the initiator is
- likely to still be very interested in this (and we did NOT already
- send it back to the initiator) */
- if ((do_fwd) || ((nhops < MIN_DV_PATH_LENGTH_FOR_INITIATOR) &&
- (GNUNET_NO == did_initiator)))
- {
- /* Pick random neighbours that are not yet on the path */
- struct NeighbourSelectionContext nsc;
- unsigned int n_cnt;
+ "Decrypted backtalk from %s\n",
+ GNUNET_i2s (&ppay.sender));
+ b = GNUNET_CONTAINER_multipeermap_get (backtalkers, &ppay.sender);
+ if ((NULL != b) && (monotime.abs_value_us < b->monotonic_time.abs_value_us))
+ {
+ GNUNET_STATISTICS_update (
+ GST_stats,
+ "# Backchannel messages dropped: monotonic time not increasing",
+ 1,
+ GNUNET_NO);
+ finish_cmc_handling (cmc);
+ return;
+ }
+ if ((NULL == b) ||
+ (0 != GNUNET_memcmp (&b->last_ephemeral, &dvb->ephemeral_key)))
+ {
+ /* Check signature */
+ struct EphemeralConfirmationPS ec;
- n_cnt = GNUNET_CONTAINER_multipeermap_size (neighbours);
- nsc.nhops = nhops;
- nsc.dvl = dvl;
- nsc.bi_history = bi_history;
- nsc.hops = hops;
- nsc.in_time = in_time;
- nsc.num_eligible = 0;
- GNUNET_CONTAINER_multipeermap_iterate (neighbours,
- &dv_neighbour_selection,
- &nsc);
- if (0 == nsc.num_eligible)
- return; /* done here, cannot forward to anyone else */
- nsc.num_selections = calculate_fork_degree (nhops, n_cnt, nsc.num_eligible);
- nsc.num_selections =
- GNUNET_MIN (MAX_DV_DISCOVERY_SELECTION, nsc.num_selections);
+ ec.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_EPHEMERAL);
+ ec.purpose.size = htonl (sizeof (ec));
+ ec.target = GST_my_identity;
+ ec.ephemeral_key = dvb->ephemeral_key;
+ if (
+ GNUNET_OK !=
+ GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_EPHEMERAL,
+ &ec.purpose,
+ &ppay.sender_sig,
+ &ppay.sender.public_key))
+ {
+ /* Signature invalid, disard! */
+ GNUNET_break_op (0);
+ finish_cmc_handling (cmc);
+ return;
+ }
+ }
+ /* Update sender, we now know the real origin! */
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Forwarding DVL to %u other peers\n",
- nsc.num_selections);
- for (unsigned int i = 0; i < nsc.num_selections; i++)
- nsc.selections[i] =
- (nsc.num_selections == n_cnt)
- ? i /* all were selected, avoid collisions by chance */
- : GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, n_cnt);
- nsc.num_eligible = 0;
- GNUNET_CONTAINER_multipeermap_iterate (neighbours,
- &dv_neighbour_transmission,
- &nsc);
- }
+ "DVBox received for me from %s via %s\n",
+ GNUNET_i2s2 (&ppay.sender),
+ GNUNET_i2s (&cmc->im.sender));
+ cmc->im.sender = ppay.sender;
+
+ if (NULL != b)
+ {
+ /* update key cache and mono time */
+ b->last_ephemeral = dvb->ephemeral_key;
+ b->monotonic_time = monotime;
+ update_backtalker_monotime (b);
+ b->timeout =
+ GNUNET_TIME_relative_to_absolute (BACKCHANNEL_INACTIVITY_TIMEOUT);
+
+ demultiplex_with_cmc (cmc, mh);
+ return;
+ }
+ /* setup data structure to cache signature AND check
+ monotonic time with PEERSTORE before forwarding backchannel payload */
+ b = GNUNET_malloc (sizeof (struct Backtalker) + sizeof (body));
+ b->pid = ppay.sender;
+ b->body_size = sizeof (body);
+ memcpy (&b[1], body, sizeof (body));
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multipeermap_put (
+ backtalkers,
+ &b->pid,
+ b,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
+ b->monotonic_time = monotime; /* NOTE: to be checked still! */
+ b->cmc = cmc;
+ b->timeout =
+ GNUNET_TIME_relative_to_absolute (BACKCHANNEL_INACTIVITY_TIMEOUT);
+ b->task = GNUNET_SCHEDULER_add_at (b->timeout, &backtalker_timeout_cb, b);
+ b->get =
+ GNUNET_PEERSTORE_iterate (peerstore,
+ "transport",
+ &b->pid,
+ GNUNET_PEERSTORE_TRANSPORT_BACKCHANNEL_MONOTIME,
+ &backtalker_monotime_cb,
+ b);
+ } /* end actual decryption */
}
/**
- * Communicator gave us a DV box. Check the message.
+ * Client notified us about transmission from a peer. Process the request.
*
- * @param cls a `struct CommunicatorMessageContext`
- * @param dvb the send message that was sent
+ * @param cls a `struct TransportClient` which sent us the message
+ * @param obm the send message that was sent
* @return #GNUNET_YES if message is well-formed
*/
static int
-check_dv_box (void *cls, const struct TransportDVBoxMessage *dvb)
+check_incoming_msg (void *cls,
+ const struct GNUNET_TRANSPORT_IncomingMessage *im)
{
- uint16_t size = ntohs (dvb->header.size);
- uint16_t num_hops = ntohs (dvb->num_hops);
- const struct GNUNET_PeerIdentity *hops =
- (const struct GNUNET_PeerIdentity *) &dvb[1];
- const struct GNUNET_MessageHeader *inbox =
- (const struct GNUNET_MessageHeader *) &hops[num_hops];
- uint16_t isize;
- uint16_t itype;
+ struct TransportClient *tc = cls;
- (void) cls;
- if (size < sizeof (*dvb) + num_hops * sizeof (struct GNUNET_PeerIdentity) +
- sizeof (struct GNUNET_MessageHeader))
+ if (CT_COMMUNICATOR != tc->type)
{
- GNUNET_break_op (0);
+ GNUNET_break (0);
return GNUNET_SYSERR;
}
- isize = ntohs (inbox->size);
- if (size !=
- sizeof (*dvb) + num_hops * sizeof (struct GNUNET_PeerIdentity) + isize)
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ GNUNET_MQ_check_boxed_message (im);
+ return GNUNET_OK;
+}
+
+
+#if 0
+/**
+ * We received a @a challenge from another peer, check if we can
+ * increase the flow control window to that peer.
+ *
+ * @param vl virtual link
+ * @param challenge the challenge we received
+ * @param sender_time when did the peer send the message?
+ * @param last_window_consum_limit maximum number of kb the sender
+ * promises to use of the previous window (if any)
+ */
+static void
+update_fc_window (struct VirtualLink *vl,
+ struct GNUNET_TIME_Absolute sender_time,
+ uint32_t last_window_consum_limit)
+{
+ // FIXME: update to new FC logic
+ if (0 == GNUNET_memcmp (challenge, &vl->n_challenge))
+ {
+ uint32_t avail;
+
+ /* Challenge identical to last one, update
+ @a last_window_consum_limit (to minimum) */
+ vl->last_fc_window_size_remaining =
+ GNUNET_MIN (last_window_consum_limit, vl->last_fc_window_size_remaining);
+ /* window could have shrunk! */
+ if (vl->available_fc_window_size > vl->last_fc_window_size_remaining)
+ avail = vl->available_fc_window_size - vl->last_fc_window_size_remaining;
+ else
+ avail = 0;
+ /* guard against integer overflow */
+ if (vl->incoming_fc_window_size_used + avail >=
+ vl->incoming_fc_window_size_used)
+ vl->incoming_fc_window_size = vl->incoming_fc_window_size_used + avail;
+ else
+ vl->incoming_fc_window_size = UINT32_MAX;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Updated window to %u/%u kb (%u used) for virtual link to %s!\n",
+ vl->incoming_fc_window_size,
+ vl->available_fc_window_size,
+ vl->incoming_fc_window_size_used,
+ GNUNET_i2s (&vl->target));
+ return;
}
- itype = ntohs (inbox->type);
- if ((GNUNET_MESSAGE_TYPE_TRANSPORT_DV_BOX == itype) ||
- (GNUNET_MESSAGE_TYPE_TRANSPORT_DV_LEARN == itype))
+ if (vl->n_challenge_time.abs_value_us >= sender_time.abs_value_us)
{
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ GNUNET_STATISTICS_update (GST_stats,
+ "# Challenges ignored: sender time not increasing",
+ 1,
+ GNUNET_NO);
+ return;
}
- if (0 == GNUNET_memcmp (&dvb->origin, &GST_my_identity))
+ /* new challenge! */
+ if (vl->incoming_fc_window_size_used > last_window_consum_limit)
{
+ /* lying peer: it already used more than it promised it would ever use! */
GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- return GNUNET_YES;
+ last_window_consum_limit = vl->incoming_fc_window_size_used;
+ }
+ /* What remains is at most the difference between what we already processed
+ and what the sender promises to limit itself to. */
+ vl->last_fc_window_size_remaining =
+ last_window_consum_limit - vl->incoming_fc_window_size_used;
+ vl->n_challenge = *challenge;
+ vl->n_challenge_time = sender_time;
+ vl->incoming_fc_window_size_used = 0;
+ /* window could have shrunk! */
+ if (vl->available_fc_window_size > vl->last_fc_window_size_remaining)
+ vl->incoming_fc_window_size =
+ vl->available_fc_window_size - vl->last_fc_window_size_remaining;
+ else
+ vl->incoming_fc_window_size = 0;
+ GNUNET_log (
+ GNUNET_ERROR_TYPE_DEBUG,
+ "New window at %u/%u kb (%u left on previous) for virtual link to %s!\n",
+ vl->incoming_fc_window_size,
+ vl->available_fc_window_size,
+ vl->last_fc_window_size_remaining,
+ GNUNET_i2s (&vl->target));
+}
+#endif
+
+
+/**
+ * Closure for #check_known_address.
+ */
+struct CheckKnownAddressContext
+{
+ /**
+ * Set to the address we are looking for.
+ */
+ const char *address;
+
+ /**
+ * Set to a matching validation state, if one was found.
+ */
+ struct ValidationState *vs;
+};
+
+
+/**
+ * Test if the validation state in @a value matches the
+ * address from @a cls.
+ *
+ * @param cls a `struct CheckKnownAddressContext`
+ * @param pid unused (must match though)
+ * @param value a `struct ValidationState`
+ * @return #GNUNET_OK if not matching, #GNUNET_NO if match found
+ */
+static int
+check_known_address (void *cls,
+ const struct GNUNET_PeerIdentity *pid,
+ void *value)
+{
+ struct CheckKnownAddressContext *ckac = cls;
+ struct ValidationState *vs = value;
+
+ (void) pid;
+ if (0 != strcmp (vs->address, ckac->address))
+ return GNUNET_OK;
+ ckac->vs = vs;
+ return GNUNET_NO;
}
/**
- * Create a DV Box message and queue it for transmission to
- * @ea next_hop.
+ * Task run periodically to validate some address based on #validation_heap.
+ *
+ * @param cls NULL
+ */
+static void
+validation_start_cb (void *cls);
+
+
+/**
+ * Set the time for next_challenge of @a vs to @a new_time.
+ * Updates the heap and if necessary reschedules the job.
*
- * @param next_hop peer to receive the message next
- * @param total_hops how many hops did the message take so far
- * @param num_hops length of the @a hops array
- * @param origin origin of the message
- * @param hops next peer(s) to the destination, including destination
- * @param payload payload of the box
- * @param payload_size number of bytes in @a payload
+ * @param vs validation state to update
+ * @param new_time new time for revalidation
*/
static void
-forward_dv_box (struct Neighbour *next_hop,
- uint16_t total_hops,
- uint16_t num_hops,
- const struct GNUNET_PeerIdentity *origin,
- const struct GNUNET_PeerIdentity *hops,
- const void *payload,
- uint16_t payload_size)
+update_next_challenge_time (struct ValidationState *vs,
+ struct GNUNET_TIME_Absolute new_time)
{
- struct TransportDVBoxMessage *dvb;
+ struct GNUNET_TIME_Relative delta;
- dvb = create_dv_box (total_hops,
- origin,
- &hops[num_hops - 1] /* == target */,
- num_hops - 1 /* do not count target twice */,
- hops,
- payload,
- payload_size);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Routing DV Box of %u bytes from %s at %u/%u hops via %s\n",
- payload_size,
- GNUNET_i2s (origin),
- (unsigned int) num_hops,
- (unsigned int) total_hops,
- GNUNET_i2s2 (&next_hop->pid));
- route_message (&next_hop->pid, &dvb->header, RMO_NONE);
- GNUNET_free (dvb);
+ if (new_time.abs_value_us == vs->next_challenge.abs_value_us)
+ return; /* be lazy */
+ vs->next_challenge = new_time;
+ if (NULL == vs->hn)
+ vs->hn =
+ GNUNET_CONTAINER_heap_insert (validation_heap, vs, new_time.abs_value_us);
+ else
+ GNUNET_CONTAINER_heap_update_cost (vs->hn, new_time.abs_value_us);
+ if ((vs != GNUNET_CONTAINER_heap_peek (validation_heap)) &&
+ (NULL != validation_task))
+ return;
+ if (NULL != validation_task)
+ GNUNET_SCHEDULER_cancel (validation_task);
+ /* randomize a bit */
+ delta.rel_value_us =
+ GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK,
+ MIN_DELAY_ADDRESS_VALIDATION.rel_value_us);
+ new_time = GNUNET_TIME_absolute_add (new_time, delta);
+ validation_task =
+ GNUNET_SCHEDULER_add_at (new_time, &validation_start_cb, NULL);
}
/**
- * Communicator gave us a DV box. Process the request.
+ * Start address validation.
*
- * @param cls a `struct CommunicatorMessageContext` (must call
- * #finish_cmc_handling() when done)
- * @param dvb the message that was received
+ * @param pid peer the @a address is for
+ * @param address an address to reach @a pid (presumably)
*/
static void
-handle_dv_box (void *cls, const struct TransportDVBoxMessage *dvb)
+start_address_validation (const struct GNUNET_PeerIdentity *pid,
+ const char *address)
{
- struct CommunicatorMessageContext *cmc = cls;
- uint16_t size = ntohs (dvb->header.size) - sizeof (*dvb);
- uint16_t num_hops = ntohs (dvb->num_hops);
- const struct GNUNET_PeerIdentity *hops =
- (const struct GNUNET_PeerIdentity *) &dvb[1];
- const struct GNUNET_MessageHeader *inbox =
- (const struct GNUNET_MessageHeader *) &hops[num_hops];
-
- if (GNUNET_EXTRA_LOGGING > 0)
- {
- char *path;
-
- path = GNUNET_strdup (GNUNET_i2s (&GST_my_identity));
- for (unsigned int i = 0; i < num_hops; i++)
- {
- char *tmp;
-
- GNUNET_asprintf (&tmp, "%s->%s", path, GNUNET_i2s (&hops[i]));
- GNUNET_free (path);
- path = tmp;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received DVBox with remainig path %s\n",
- path);
- GNUNET_free (path);
- }
+ struct GNUNET_TIME_Absolute now;
+ struct ValidationState *vs;
+ struct CheckKnownAddressContext ckac = {.address = address, .vs = NULL};
- if (num_hops > 0)
+ (void) GNUNET_CONTAINER_multipeermap_get_multiple (validation_map,
+ pid,
+ &check_known_address,
+ &ckac);
+ if (NULL != (vs = ckac.vs))
{
- /* We're trying from the end of the hops array, as we may be
- able to find a shortcut unknown to the origin that way */
- for (int i = num_hops - 1; i >= 0; i--)
+ /* if 'vs' is not currently valid, we need to speed up retrying the
+ * validation */
+ if (vs->validated_until.abs_value_us < vs->next_challenge.abs_value_us)
{
- struct Neighbour *n;
-
- if (0 == GNUNET_memcmp (&hops[i], &GST_my_identity))
- {
- GNUNET_break_op (0);
- finish_cmc_handling (cmc);
- return;
- }
- n = lookup_neighbour (&hops[i]);
- if (NULL == n)
- continue;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Skipping %u/%u hops ahead while routing DV Box\n",
- i,
- num_hops);
- forward_dv_box (n,
- ntohs (dvb->total_hops) + 1,
- num_hops - i - 1, /* number of hops left */
- &dvb->origin,
- &hops[i + 1], /* remaining hops */
- (const void *) &dvb[1],
- size);
- GNUNET_STATISTICS_update (GST_stats,
- "# DV hops skipped routing boxes",
- i,
- GNUNET_NO);
- GNUNET_STATISTICS_update (GST_stats,
- "# DV boxes routed (total)",
- 1,
- GNUNET_NO);
- finish_cmc_handling (cmc);
- return;
+ /* reduce backoff as we got a fresh advertisement */
+ vs->challenge_backoff =
+ GNUNET_TIME_relative_min (FAST_VALIDATION_CHALLENGE_FREQ,
+ GNUNET_TIME_relative_divide (vs->challenge_backoff,
+ 2));
+ update_next_challenge_time (vs,
+ GNUNET_TIME_relative_to_absolute (
+ vs->challenge_backoff));
}
- /* Woopsie, next hop not in neighbours, drop! */
- GNUNET_STATISTICS_update (GST_stats,
- "# DV Boxes dropped: next hop unknown",
- 1,
- GNUNET_NO);
- finish_cmc_handling (cmc);
return;
}
- /* We are the target. Unbox and handle message. */
+ now = GNUNET_TIME_absolute_get ();
+ vs = GNUNET_new (struct ValidationState);
+ vs->pid = *pid;
+ vs->valid_until =
+ GNUNET_TIME_relative_to_absolute (ADDRESS_VALIDATION_LIFETIME);
+ vs->first_challenge_use = now;
+ vs->validation_rtt = GNUNET_TIME_UNIT_FOREVER_REL;
+ GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_NONCE,
+ &vs->challenge,
+ sizeof (vs->challenge));
+ vs->address = GNUNET_strdup (address);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "DVBox received for me from %s\n",
- GNUNET_i2s (&dvb->origin));
- GNUNET_STATISTICS_update (GST_stats,
- "# DV boxes opened (ultimate target)",
- 1,
- GNUNET_NO);
- cmc->im.sender = dvb->origin;
- cmc->total_hops = ntohs (dvb->total_hops);
- // FIXME: should *decrypt* inbox here; needs BackchannelEncapsulation!
- // FIXME: need to prevent box-in-a-box, so check inbox type!
- demultiplex_with_cmc (cmc, inbox);
+ "Starting address validation `%s' of peer %s using challenge %s\n",
+ address,
+ GNUNET_i2s (pid),
+ GNUNET_sh2s (&vs->challenge.value));
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multipeermap_put (
+ validation_map,
+ &vs->pid,
+ vs,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
+ update_next_challenge_time (vs, now);
}
/**
- * Client notified us about transmission from a peer. Process the request.
+ * Function called by PEERSTORE for each matching record.
*
- * @param cls a `struct TransportClient` which sent us the message
- * @param obm the send message that was sent
- * @return #GNUNET_YES if message is well-formed
+ * @param cls closure, a `struct IncomingRequest`
+ * @param record peerstore record information
+ * @param emsg error message, or NULL if no errors
*/
-static int
-check_incoming_msg (void *cls,
- const struct GNUNET_TRANSPORT_IncomingMessage *im)
+static void
+handle_hello_for_incoming (void *cls,
+ const struct GNUNET_PEERSTORE_Record *record,
+ const char *emsg)
{
- struct TransportClient *tc = cls;
+ struct IncomingRequest *ir = cls;
+ const char *val;
- if (CT_COMMUNICATOR != tc->type)
+ if (NULL != emsg)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ "Got failure from PEERSTORE: %s\n",
+ emsg);
+ return;
+ }
+ val = record->value;
+ if ((0 == record->value_size) || ('\0' != val[record->value_size - 1]))
{
GNUNET_break (0);
- return GNUNET_SYSERR;
+ return;
}
- GNUNET_MQ_check_boxed_message (im);
- return GNUNET_OK;
+ start_address_validation (&ir->pid, (const char *) record->value);
}
const struct TransportValidationChallengeMessage *tvc)
{
struct CommunicatorMessageContext *cmc = cls;
- struct TransportValidationResponseMessage *tvr;
+ struct TransportValidationResponseMessage tvr;
+ struct VirtualLink *vl;
+ struct GNUNET_TIME_RelativeNBO validity_duration;
+ struct IncomingRequest *ir;
+ struct Neighbour *n;
+ /* DV-routed messages are not allowed for validation challenges */
if (cmc->total_hops > 0)
{
- /* DV routing is not allowed for validation challenges! */
GNUNET_break_op (0);
finish_cmc_handling (cmc);
return;
}
+ validity_duration = cmc->im.expected_address_validity;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Received address validation challenge %s\n",
GNUNET_sh2s (&tvc->challenge.value));
- tvr = GNUNET_new (struct TransportValidationResponseMessage);
- tvr->header.type =
+ /* If we have a virtual link, we use this mechanism to signal the
+ size of the flow control window, and to allow the sender
+ to ask for increases. If for us the virtual link is still down,
+ we will always give a window size of zero. */
+ tvr.header.type =
htons (GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_VALIDATION_RESPONSE);
- tvr->header.size = htons (sizeof (*tvr));
- tvr->challenge = tvc->challenge;
- tvr->origin_time = tvc->sender_time;
- tvr->validity_duration = cmc->im.expected_address_validity;
+ tvr.header.size = htons (sizeof (tvr));
+ tvr.reserved = htonl (0);
+ tvr.challenge = tvc->challenge;
+ tvr.origin_time = tvc->sender_time;
+ tvr.validity_duration = validity_duration;
{
/* create signature */
struct TransportValidationPS tvp =
{.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_CHALLENGE),
.purpose.size = htonl (sizeof (tvp)),
- .validity_duration = tvr->validity_duration,
+ .validity_duration = validity_duration,
.challenge = tvc->challenge};
GNUNET_assert (GNUNET_OK == GNUNET_CRYPTO_eddsa_sign (GST_my_private_key,
&tvp.purpose,
- &tvr->signature));
+ &tvr.signature));
}
route_message (&cmc->im.sender,
- &tvr->header,
+ &tvr.header,
RMO_ANYTHING_GOES | RMO_REDUNDANT);
finish_cmc_handling (cmc);
+
+ vl = lookup_virtual_link (&cmc->im.sender);
+ if (NULL != vl)
+ return;
+
+ /* For us, the link is still down, but we need bi-directional
+ connections (for flow-control and for this to be useful for
+ CORE), so we must try to bring the link up! */
+
+ /* (1) Check existing queues, if any, we may be lucky! */
+ n = lookup_neighbour (&cmc->im.sender);
+ if (NULL != n)
+ for (struct Queue *q = n->queue_head; NULL != q; q = q->next_neighbour)
+ start_address_validation (&cmc->im.sender, q->address);
+ /* (2) Also try to see if we have addresses in PEERSTORE for this peer
+ we could use */
+ for (ir = ir_head; NULL != ir; ir = ir->next)
+ if (0 == GNUNET_memcmp (&ir->pid, &cmc->im.sender))
+ return; /* we are already trying */
+ ir = GNUNET_new (struct IncomingRequest);
+ ir->pid = cmc->im.sender;
+ GNUNET_CONTAINER_DLL_insert (ir_head, ir_tail, ir);
+ ir->wc = GNUNET_PEERSTORE_watch (peerstore,
+ "transport",
+ &ir->pid,
+ GNUNET_PEERSTORE_TRANSPORT_URLADDRESS_KEY,
+ &handle_hello_for_incoming,
+ ir);
+ ir_total++;
+ /* Bound attempts we do in parallel here, might otherwise get excessive */
+ while (ir_total > MAX_INCOMING_REQUEST)
+ free_incoming_request (ir_head);
}
static void
peerstore_store_validation_cb (void *cls, int success)
{
- struct ValidationState *vs = cls;
-
- vs->sc = NULL;
- if (GNUNET_YES == success)
- return;
- GNUNET_STATISTICS_update (GST_stats,
- "# Peerstore failed to store foreign address",
- 1,
- GNUNET_NO);
-}
-
-
-/**
- * Task run periodically to validate some address based on #validation_heap.
- *
- * @param cls NULL
- */
-static void
-validation_start_cb (void *cls);
-
-
-/**
- * Set the time for next_challenge of @a vs to @a new_time.
- * Updates the heap and if necessary reschedules the job.
- *
- * @param vs validation state to update
- * @param new_time new time for revalidation
- */
-static void
-update_next_challenge_time (struct ValidationState *vs,
- struct GNUNET_TIME_Absolute new_time)
-{
- struct GNUNET_TIME_Relative delta;
-
- if (new_time.abs_value_us == vs->next_challenge.abs_value_us)
- return; /* be lazy */
- vs->next_challenge = new_time;
- if (NULL == vs->hn)
- vs->hn =
- GNUNET_CONTAINER_heap_insert (validation_heap, vs, new_time.abs_value_us);
- else
- GNUNET_CONTAINER_heap_update_cost (vs->hn, new_time.abs_value_us);
- if ((vs != GNUNET_CONTAINER_heap_peek (validation_heap)) &&
- (NULL != validation_task))
+ struct ValidationState *vs = cls;
+
+ vs->sc = NULL;
+ if (GNUNET_YES == success)
return;
- if (NULL != validation_task)
- GNUNET_SCHEDULER_cancel (validation_task);
- /* randomize a bit */
- delta.rel_value_us =
- GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK,
- MIN_DELAY_ADDRESS_VALIDATION.rel_value_us);
- new_time = GNUNET_TIME_absolute_add (new_time, delta);
- validation_task =
- GNUNET_SCHEDULER_add_at (new_time, &validation_start_cb, NULL);
+ GNUNET_STATISTICS_update (GST_stats,
+ "# Peerstore failed to store foreign address",
+ 1,
+ GNUNET_NO);
}
q->validated_until = vs->validated_until;
q->pd.aged_rtt = vs->validation_rtt;
n = q->neighbour;
- vl = GNUNET_CONTAINER_multipeermap_get (links, &vs->pid);
+ vl = lookup_virtual_link (&vs->pid);
if (NULL != vl)
{
/* Link was already up, remember n is also now available and we are done */
- vl->n = n;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Virtual link to %s could now also direct neighbour!\n",
- GNUNET_i2s (&vs->pid));
+ if (NULL == vl->n)
+ {
+ vl->n = n;
+ n->vl = vl;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Virtual link to %s could now also direct neighbour!\n",
+ GNUNET_i2s (&vs->pid));
+ }
+ else
+ {
+ GNUNET_assert (n == vl->n);
+ }
return;
}
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
vl = GNUNET_new (struct VirtualLink);
vl->target = n->pid;
vl->n = n;
+ n->vl = vl;
vl->core_recv_window = RECV_WINDOW_SIZE;
+ vl->available_fc_window_size = DEFAULT_WINDOW_SIZE;
+ vl->my_challenge = tvr->challenge;
vl->visibility_task =
GNUNET_SCHEDULER_add_at (q->validated_until, &check_link_down, vl);
GNUNET_break (GNUNET_YES ==
{
if (pm->msg_uuid_set)
return;
- pm->msg_uuid.uuid = pm->target->message_uuid_ctr++;
+ pm->msg_uuid.uuid = pm->vl->message_uuid_ctr++;
pm->msg_uuid_set = GNUNET_YES;
}
"Fragmenting message %llu <%llu> to %s for MTU %u\n",
(unsigned long long) pm->msg_uuid.uuid,
pm->logging_uuid,
- GNUNET_i2s (&pm->target->pid),
+ GNUNET_i2s (&pm->vl->target),
(unsigned int) mtu);
pa = prepare_pending_acknowledgement (queue, dvh, pm);
GNUNET_malloc (sizeof (struct PendingMessage) +
sizeof (struct TransportFragmentBoxMessage) + fragsize);
frag->logging_uuid = logging_uuid_gen++;
- frag->target = pm->target;
+ frag->vl = pm->vl;
frag->frag_parent = ff;
frag->timeout = pm->timeout;
frag->bytes_msg = sizeof (struct TransportFragmentBoxMessage) + fragsize;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Preparing reliability box for message <%llu> to %s on queue %s\n",
pm->logging_uuid,
- GNUNET_i2s (&pm->target->pid),
+ GNUNET_i2s (&pm->vl->target),
queue->address);
pa = prepare_pending_acknowledgement (queue, dvh, pm);
bpm = GNUNET_malloc (sizeof (struct PendingMessage) + sizeof (rbox) +
pm->bytes_msg);
bpm->logging_uuid = logging_uuid_gen++;
- bpm->target = pm->target;
+ bpm->vl = pm->vl;
bpm->frag_parent = pm;
GNUNET_CONTAINER_MDLL_insert (frag, pm->head_frag, pm->tail_frag, bpm);
bpm->timeout = pm->timeout;
update_pm_next_attempt (struct PendingMessage *pm,
struct GNUNET_TIME_Absolute next_attempt)
{
- struct Neighbour *neighbour = pm->target;
+ struct VirtualLink *vl = pm->vl;
pm->next_attempt = next_attempt;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
struct PendingMessage *pos;
/* re-insert sort in neighbour list */
- GNUNET_CONTAINER_MDLL_remove (neighbour,
- neighbour->pending_msg_head,
- neighbour->pending_msg_tail,
+ GNUNET_CONTAINER_MDLL_remove (vl,
+ vl->pending_msg_head,
+ vl->pending_msg_tail,
pm);
- pos = neighbour->pending_msg_tail;
+ pos = vl->pending_msg_tail;
while ((NULL != pos) &&
(next_attempt.abs_value_us > pos->next_attempt.abs_value_us))
- pos = pos->prev_neighbour;
- GNUNET_CONTAINER_MDLL_insert_after (neighbour,
- neighbour->pending_msg_head,
- neighbour->pending_msg_tail,
+ pos = pos->prev_vl;
+ GNUNET_CONTAINER_MDLL_insert_after (vl,
+ vl->pending_msg_head,
+ vl->pending_msg_tail,
pos,
pm);
}
/**
- * We believe we are ready to transmit a message on a queue.
- * Gives the message to the
- * communicator for transmission (updating the tracker, and re-scheduling
- * itself if applicable).
+ * Context for #select_best_pending_from_link().
+ */
+struct PendingMessageScoreContext
+{
+ /**
+ * Set to the best message that was found, NULL for none.
+ */
+ struct PendingMessage *best;
+
+ /**
+ * DVH that @e best should take, or NULL for direct transmission.
+ */
+ struct DistanceVectorHop *dvh;
+
+ /**
+ * What is the estimated total overhead for this message?
+ */
+ size_t real_overhead;
+
+ /**
+ * Number of pending messages we seriously considered this time.
+ */
+ unsigned int consideration_counter;
+
+ /**
+ * Did we have to fragment?
+ */
+ int frag;
+
+ /**
+ * Did we have to reliability box?
+ */
+ int relb;
+};
+
+
+/**
+ * Select the best pending message from @a vl for transmission
+ * via @a queue.
+ *
+ * @param sc[in,out] best message so far (NULL for none), plus scoring data
+ * @param queue the queue that will be used for transmission
+ * @param vl the virtual link providing the messages
+ * @param dvh path we are currently considering, or NULL for none
+ * @param overhead number of bytes of overhead to be expected
+ * from DV encapsulation (0 for without DV)
+ */
+static void
+select_best_pending_from_link (struct PendingMessageScoreContext *sc,
+ struct Queue *queue,
+ struct VirtualLink *vl,
+ struct DistanceVectorHop *dvh,
+ size_t overhead)
+{
+ struct GNUNET_TIME_Absolute now;
+
+ now = GNUNET_TIME_absolute_get ();
+ for (struct PendingMessage *pos = vl->pending_msg_head; NULL != pos;
+ pos = pos->next_vl)
+ {
+ size_t real_overhead = overhead;
+ int frag;
+ int relb;
+
+ if (pos->next_attempt.abs_value_us > now.abs_value_us)
+ break; /* too early for all messages, they are sorted by next_attempt */
+ if (NULL != pos->qe)
+ continue; /* not eligible */
+ sc->consideration_counter++;
+ /* determine if we have to reliability-box, if so add reliability box
+ overhead */
+ relb = GNUNET_NO;
+ if ((GNUNET_NO == frag) &&
+ (0 == (pos->prefs & GNUNET_MQ_PREF_UNRELIABLE)) &&
+ (GNUNET_TRANSPORT_CC_RELIABLE != queue->tc->details.communicator.cc))
+ {
+ relb = GNUNET_YES;
+ real_overhead += sizeof (struct TransportReliabilityBoxMessage);
+ }
+ /* determine if we have to fragment, if so add fragmentation
+ overhead! */
+ frag = GNUNET_NO;
+ if ( ( (0 != queue->mtu) &&
+ (pos->bytes_msg + real_overhead > queue->mtu) ) ||
+ (pos->bytes_msg > UINT16_MAX - sizeof (struct GNUNET_TRANSPORT_SendMessageTo)) ||
+ (NULL != pos->head_frag /* fragments already exist, should
+ respect that even if MTU is 0 for
+ this queue */) )
+ {
+ frag = GNUNET_YES;
+ relb = GNUNET_NO; /* if we fragment, we never also reliability box */
+ if (GNUNET_TRANSPORT_CC_RELIABLE == queue->tc->details.communicator.cc)
+ {
+ /* FIXME-OPTIMIZE: we could use an optimized, shorter fragmentation
+ header without the ACK UUID when using a *reliable* channel! */
+ }
+ real_overhead = overhead + sizeof (struct TransportFragmentBoxMessage);
+ }
+
+ /* Finally, compare to existing 'best' in sc to see if this 'pos' pending
+ message would beat it! */
+ if (NULL != sc->best)
+ {
+ /* CHECK if pos fits queue BETTER (=smaller) than pm, if not: continue;
+ OPTIMIZE-ME: This is a heuristic, which so far has NOT been
+ experimentally validated. There may be some huge potential for
+ improvement here. Also, we right now only compare how well the
+ given message fits _this_ queue, and do not consider how well other
+ queues might suit the message. Taking other queues into consideration
+ may further improve the result, but could also be expensive
+ in terms of CPU time. */
+ long long sc_score = sc->frag * 40 + sc->relb * 20 + sc->real_overhead;
+ long long pm_score = frag * 40 + relb * 20 + real_overhead;
+ long long time_delta =
+ (sc->best->next_attempt.abs_value_us - pos->next_attempt.abs_value_us) /
+ 1000LL;
+
+ /* "time_delta" considers which message has been 'ready' for transmission
+ for longer, if a message has a preference for low latency, increase
+ the weight of the time_delta by 10x if it is favorable for that message */
+ if ((0 != (pos->prefs & GNUNET_MQ_PREF_LOW_LATENCY)) &&
+ (0 != (sc->best->prefs & GNUNET_MQ_PREF_LOW_LATENCY)))
+ time_delta *= 10; /* increase weight (always, both are low latency) */
+ else if ((0 != (pos->prefs & GNUNET_MQ_PREF_LOW_LATENCY)) &&
+ (time_delta > 0))
+ time_delta *=
+ 10; /* increase weight, favors 'pos', which is low latency */
+ else if ((0 != (sc->best->prefs & GNUNET_MQ_PREF_LOW_LATENCY)) &&
+ (time_delta < 0))
+ time_delta *=
+ 10; /* increase weight, favors 'sc->best', which is low latency */
+ if (0 != queue->mtu)
+ {
+ /* Grant bonus if we are bellow MTU, larger bonus the closer we will
+ be to the MTU */
+ if (queue->mtu > sc->real_overhead + sc->best->bytes_msg)
+ sc_score -= queue->mtu - (sc->real_overhead + sc->best->bytes_msg);
+ if (queue->mtu > real_overhead + pos->bytes_msg)
+ pm_score -= queue->mtu - (real_overhead + pos->bytes_msg);
+ }
+ if (sc_score + time_delta > pm_score)
+ continue; /* sc_score larger, keep sc->best */
+ }
+ sc->best = pos;
+ sc->dvh = dvh;
+ sc->frag = frag;
+ sc->relb = relb;
+ }
+}
+
+
+/**
+ * We believe we are ready to transmit a `struct PendingMessage` on a
+ * queue, the big question is which one! We need to see if there is
+ * one pending that is allowed by flow control and congestion control
+ * and (ideally) matches our queue's performance profile.
+ *
+ * If such a message is found, we give the message to the communicator
+ * for transmission (updating the tracker, and re-scheduling ourselves
+ * if applicable).
+ *
+ * If no such message is found, the queue's `idle` field must be set
+ * to #GNUNET_YES.
*
* @param cls the `struct Queue` to process transmissions for
*/
{
struct Queue *queue = cls;
struct Neighbour *n = queue->neighbour;
+ struct PendingMessageScoreContext sc;
struct PendingMessage *pm;
- struct PendingMessage *s;
- uint32_t overhead;
queue->transmit_task = NULL;
- if (NULL == (pm = n->pending_msg_head))
+ if (NULL == n->vl)
{
- /* no message pending, nothing to do here! */
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "No messages waiting on queue %s to %s, going to sleep\n",
- queue->address,
- GNUNET_i2s (&n->pid));
+ "Virtual link `%s' is down, cannot have PM for queue `%s'\n",
+ GNUNET_i2s (&n->pid),
+ queue->address);
+ queue->idle = GNUNET_YES;
return;
}
- if (NULL != pm->qe)
+ memset (&sc, 0, sizeof (sc));
+ select_best_pending_from_link (&sc, queue, n->vl, NULL, 0);
+ if (NULL == sc.best)
+ {
+ /* Also look at DVH that have the n as first hop! */
+ for (struct DistanceVectorHop *dvh = n->dv_head; NULL != dvh;
+ dvh = dvh->next_neighbour)
+ {
+ select_best_pending_from_link (&sc,
+ queue,
+ dvh->dv->vl,
+ dvh,
+ sizeof (struct GNUNET_PeerIdentity) *
+ (1 + dvh->distance) +
+ sizeof (struct TransportDVBoxMessage) +
+ sizeof (struct TransportDVBoxPayloadP));
+ }
+ }
+ if (NULL == sc.best)
{
- /* message still pending with communciator!
- LOGGING-FIXME: Use stats? Should this not be rare? */
+ /* no message pending, nothing to do here! */
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Waiting on communicator for queue %s to %s, going to sleep\n",
+ "No pending messages, queue `%s' to %s now idle\n",
queue->address,
GNUNET_i2s (&n->pid));
+ queue->idle = GNUNET_YES;
return;
}
- schedule_transmit_on_queue (queue, GNUNET_YES);
- if (NULL != queue->transmit_task)
+
+ /* Given selection in `sc`, do transmission */
+ pm = sc.best;
+ if (GNUNET_YES == sc.frag)
{
- GNUNET_log (
- GNUNET_ERROR_TYPE_DEBUG,
- "Scheduled transmission on queue %s to %s for later, going to sleep\n",
- queue->address,
- GNUNET_i2s (&n->pid));
- return; /* do it later */
- }
- overhead = 0;
- if (GNUNET_TRANSPORT_CC_RELIABLE != queue->tc->details.communicator.cc)
- overhead += sizeof (struct TransportReliabilityBoxMessage);
- s = pm;
- if ( ( (0 != queue->mtu) &&
- (pm->bytes_msg + overhead > queue->mtu) ) ||
- (pm->bytes_msg > UINT16_MAX - sizeof (struct GNUNET_TRANSPORT_SendMessageTo)) ||
- (NULL != pm->head_frag /* fragments already exist, should
- respect that even if MTU is 0 for
- this queue */) )
- s = fragment_message (queue, pm->dvh, s);
- if (NULL == s)
- {
- /* Fragmentation failed, try next message... */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Fragmentation failed queue %s to %s for <%llu>, trying again\n",
- queue->address,
- GNUNET_i2s (&n->pid),
- pm->logging_uuid);
- schedule_transmit_on_queue (queue, GNUNET_NO);
- return;
+ pm = fragment_message (queue, sc.dvh, sc.best);
+ if (NULL == pm)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Fragmentation failed queue %s to %s for <%llu>, trying again\n",
+ queue->address,
+ GNUNET_i2s (&n->pid),
+ pm->logging_uuid);
+ schedule_transmit_on_queue (queue, GNUNET_SCHEDULER_PRIORITY_DEFAULT);
+ }
}
- if (GNUNET_TRANSPORT_CC_RELIABLE != queue->tc->details.communicator.cc)
- // FIXME-OPTIMIZE: and if reliability was requested for 's' by core!
- s = reliability_box_message (queue, pm->dvh, s);
- if (NULL == s)
+ else if (GNUNET_YES == sc.relb)
{
- /* Reliability boxing failed, try next message... */
- GNUNET_log (
- GNUNET_ERROR_TYPE_DEBUG,
- "Reliability boxing failed queue %s to %s for <%llu>, trying again\n",
- queue->address,
- GNUNET_i2s (&n->pid),
- pm->logging_uuid);
- schedule_transmit_on_queue (queue, GNUNET_NO);
- return;
+ pm = reliability_box_message (queue, sc.dvh, sc.best);
+ if (NULL == pm)
+ {
+ /* Reliability boxing failed, try next message... */
+ GNUNET_log (
+ GNUNET_ERROR_TYPE_DEBUG,
+ "Reliability boxing failed queue %s to %s for <%llu>, trying again\n",
+ queue->address,
+ GNUNET_i2s (&n->pid),
+ pm->logging_uuid);
+ schedule_transmit_on_queue (queue, GNUNET_SCHEDULER_PRIORITY_DEFAULT);
+ return;
+ }
}
+ else
+ pm = sc.best; /* no boxing required */
- /* Pass 's' for transission to the communicator */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Passing message <%llu> to queue %s for peer %s\n",
- s->logging_uuid,
- queue->address,
- GNUNET_i2s (&n->pid));
- queue_send_msg (queue, s, &s[1], s->bytes_msg);
- // FIXME: do something similar to the logic below
- // in defragmentation / reliability ACK handling!
+ /* Pass 'pm' for transission to the communicator */
+ GNUNET_log (
+ GNUNET_ERROR_TYPE_DEBUG,
+ "Passing message <%llu> to queue %s for peer %s (considered %u others)\n",
+ pm->logging_uuid,
+ queue->address,
+ GNUNET_i2s (&n->pid),
+ sc.consideration_counter);
+ queue_send_msg (queue, pm, &pm[1], pm->bytes_msg);
/* Check if this transmission somehow conclusively finished handing 'pm'
even without any explicit ACKs */
- if ((PMT_CORE == s->pmt) &&
+ if ((PMT_CORE == pm->pmt) ||
(GNUNET_TRANSPORT_CC_RELIABLE == queue->tc->details.communicator.cc))
{
- /* Full message sent, and over reliabile channel */
- client_send_response (pm);
- }
- else if ((GNUNET_TRANSPORT_CC_RELIABLE ==
- queue->tc->details.communicator.cc) &&
- (PMT_FRAGMENT_BOX == s->pmt))
- {
- struct PendingMessage *pos;
-
- /* Fragment sent over reliabile channel */
- free_fragment_tree (s);
- pos = s->frag_parent;
- GNUNET_CONTAINER_MDLL_remove (frag, pos->head_frag, pos->tail_frag, s);
- GNUNET_free (s);
- /* check if subtree is done */
- while ((NULL == pos->head_frag) && (pos->frag_off == pos->bytes_msg) &&
- (pos != pm))
- {
- s = pos;
- pos = s->frag_parent;
- GNUNET_CONTAINER_MDLL_remove (frag, pos->head_frag, pos->tail_frag, s);
- GNUNET_free (s);
- }
-
- /* Was this the last applicable fragmment? */
- if ((NULL == pm->head_frag) && (pm->frag_off == pm->bytes_msg))
- client_send_response (pm);
- }
- else if (PMT_CORE != pm->pmt)
- {
- /* This was an acknowledgement of some type, always free */
- free_pending_message (pm);
+ completed_pending_message (pm);
}
else
{
characteristics (i.e. RTT); it takes one RTT for the message to
arrive and the ACK to come back in the best case; but the other
side is allowed to delay ACKs by 2 RTTs, so we use 4 RTT before
- retransmitting. Note that in the future this heuristic should
- likely be improved further (measure RTT stability, consider
- message urgency and size when delaying ACKs, etc.) */
- update_pm_next_attempt (s,
+ retransmitting.
+
+ OPTIMIZE: Note that in the future this heuristic should likely
+ be improved further (measure RTT stability, consider message
+ urgency and size when delaying ACKs, etc.) */
+ update_pm_next_attempt (pm,
GNUNET_TIME_relative_to_absolute (
GNUNET_TIME_relative_multiply (queue->pd.aged_rtt,
4)));
}
-
/* finally, re-schedule queue transmission task itself */
- schedule_transmit_on_queue (queue, GNUNET_NO);
+ schedule_transmit_on_queue (queue, GNUNET_SCHEDULER_PRIORITY_DEFAULT);
}
for (struct Queue *queue = tc->details.communicator.queue_head;
NULL != queue;
queue = queue->next_client)
- schedule_transmit_on_queue (queue, GNUNET_NO);
+ schedule_transmit_on_queue (queue, GNUNET_SCHEDULER_PRIORITY_DEFAULT);
}
else if (QUEUE_LENGTH_LIMIT - 1 == qe->queue->queue_length)
{
"# Transmission throttled due to queue queue limit",
-1,
GNUNET_NO);
- schedule_transmit_on_queue (qe->queue, GNUNET_NO);
+ schedule_transmit_on_queue (qe->queue, GNUNET_SCHEDULER_PRIORITY_DEFAULT);
}
if (NULL != (pm = qe->pm))
{
- struct Neighbour *n;
+ struct VirtualLink *vl;
GNUNET_assert (qe == pm->qe);
pm->qe = NULL;
/* If waiting for this communicator may have blocked transmission
of pm on other queues for this neighbour, force schedule
transmit on queue for queues of the neighbour */
- n = pm->target;
- if (n->pending_msg_head == pm)
- {
- for (struct Queue *queue = n->queue_head; NULL != queue;
- queue = queue->next_neighbour)
- schedule_transmit_on_queue (queue, GNUNET_NO);
- }
- if (GNUNET_OK != ntohl (sma->status))
- {
- GNUNET_log (
- GNUNET_ERROR_TYPE_INFO,
- "Queue failed in transmission <%llu>, will try retransmission immediately\n",
- pm->logging_uuid);
- update_pm_next_attempt (pm, GNUNET_TIME_UNIT_ZERO_ABS);
- }
+ vl = pm->vl;
+ if (vl->pending_msg_head == pm)
+ check_vl_transmission (vl);
}
GNUNET_free (qe);
}
{
struct TransportValidationChallengeMessage tvc;
- vs->last_challenge_use = GNUNET_TIME_absolute_get ();
+ vs->last_challenge_use = GNUNET_TIME_absolute_get_monotonic (GST_cfg);
tvc.header.type =
htons (GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_VALIDATION_CHALLENGE);
tvc.header.size = htons (sizeof (tvc));
if (NULL == neighbour)
{
neighbour = GNUNET_new (struct Neighbour);
- neighbour->message_uuid_ctr =
- GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK, UINT64_MAX);
neighbour->pid = aqm->receiver;
GNUNET_assert (GNUNET_OK ==
GNUNET_CONTAINER_multipeermap_put (
queue->nt = (enum GNUNET_NetworkType) ntohl (aqm->nt);
queue->cs = (enum GNUNET_TRANSPORT_ConnectionStatus) ntohl (aqm->cs);
queue->neighbour = neighbour;
+ queue->idle = GNUNET_YES;
memcpy (&queue[1], addr, addr_len);
/* notify monitors about new queue */
{
&aqm->receiver,
&check_validation_request_pending,
queue);
+ /* look for traffic for this queue */
+ schedule_transmit_on_queue (queue, GNUNET_SCHEDULER_PRIORITY_DEFAULT);
/* might be our first queue, try launching DV learning */
if (NULL == dvlearn_task)
dvlearn_task = GNUNET_SCHEDULER_add_now (&start_dv_learn, NULL);
}
-/**
- * Closure for #check_known_address.
- */
-struct CheckKnownAddressContext
-{
- /**
- * Set to the address we are looking for.
- */
- const char *address;
-
- /**
- * Set to a matching validation state, if one was found.
- */
- struct ValidationState *vs;
-};
-
-
-/**
- * Test if the validation state in @a value matches the
- * address from @a cls.
- *
- * @param cls a `struct CheckKnownAddressContext`
- * @param pid unused (must match though)
- * @param value a `struct ValidationState`
- * @return #GNUNET_OK if not matching, #GNUNET_NO if match found
- */
-static int
-check_known_address (void *cls,
- const struct GNUNET_PeerIdentity *pid,
- void *value)
-{
- struct CheckKnownAddressContext *ckac = cls;
- struct ValidationState *vs = value;
-
- (void) pid;
- if (0 != strcmp (vs->address, ckac->address))
- return GNUNET_OK;
- ckac->vs = vs;
- return GNUNET_NO;
-}
-
-
-/**
- * Start address validation.
- *
- * @param pid peer the @a address is for
- * @param address an address to reach @a pid (presumably)
- */
-static void
-start_address_validation (const struct GNUNET_PeerIdentity *pid,
- const char *address)
-{
- struct GNUNET_TIME_Absolute now;
- struct ValidationState *vs;
- struct CheckKnownAddressContext ckac = {.address = address, .vs = NULL};
-
- (void) GNUNET_CONTAINER_multipeermap_get_multiple (validation_map,
- pid,
- &check_known_address,
- &ckac);
- if (NULL != (vs = ckac.vs))
- {
- /* if 'vs' is not currently valid, we need to speed up retrying the
- * validation */
- if (vs->validated_until.abs_value_us < vs->next_challenge.abs_value_us)
- {
- /* reduce backoff as we got a fresh advertisement */
- vs->challenge_backoff =
- GNUNET_TIME_relative_min (FAST_VALIDATION_CHALLENGE_FREQ,
- GNUNET_TIME_relative_divide (vs->challenge_backoff,
- 2));
- update_next_challenge_time (vs,
- GNUNET_TIME_relative_to_absolute (
- vs->challenge_backoff));
- }
- return;
- }
- now = GNUNET_TIME_absolute_get ();
- vs = GNUNET_new (struct ValidationState);
- vs->pid = *pid;
- vs->valid_until =
- GNUNET_TIME_relative_to_absolute (ADDRESS_VALIDATION_LIFETIME);
- vs->first_challenge_use = now;
- vs->validation_rtt = GNUNET_TIME_UNIT_FOREVER_REL;
- GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_NONCE,
- &vs->challenge,
- sizeof (vs->challenge));
- vs->address = GNUNET_strdup (address);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Starting address validation `%s' of peer %s using challenge %s\n",
- address,
- GNUNET_i2s (pid),
- GNUNET_sh2s (&vs->challenge.value));
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_put (
- validation_map,
- &vs->pid,
- vs,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
- update_next_challenge_time (vs, now);
-}
-
-
/**
* Function called by PEERSTORE for each matching record.
*
- * @param cls closure
+ * @param cls closure, a `struct PeerRequest`
* @param record peerstore record information
* @param emsg error message, or NULL if no errors
*/
static void
-handle_hello (void *cls,
- const struct GNUNET_PEERSTORE_Record *record,
- const char *emsg)
+handle_hello_for_client (void *cls,
+ const struct GNUNET_PEERSTORE_Record *record,
+ const char *emsg)
{
struct PeerRequest *pr = cls;
const char *val;
"transport",
&pr->pid,
GNUNET_PEERSTORE_TRANSPORT_URLADDRESS_KEY,
- &handle_hello,
+ &handle_hello_for_client,
pr);
GNUNET_SERVICE_client_continue (tc->client);
}
}
-/**
- * Free ephemeral entry.
- *
- * @param cls NULL
- * @param pid unused
- * @param value a `struct EphemeralCacheEntry`
- * @return #GNUNET_OK (always)
- */
-static int
-free_ephemeral_cb (void *cls,
- const struct GNUNET_PeerIdentity *pid,
- void *value)
-{
- struct EphemeralCacheEntry *ece = value;
-
- (void) cls;
- (void) pid;
- free_ephemeral (ece);
- return GNUNET_OK;
-}
-
-
/**
* Free validation state.
*
struct LearnLaunchEntry *lle;
(void) cls;
- if (NULL != ephemeral_task)
- {
- GNUNET_SCHEDULER_cancel (ephemeral_task);
- ephemeral_task = NULL;
- }
GNUNET_CONTAINER_multipeermap_iterate (neighbours, &free_neighbour_cb, NULL);
if (NULL != peerstore)
{
NULL);
GNUNET_CONTAINER_multipeermap_destroy (validation_map);
validation_map = NULL;
+ while (NULL != ir_head)
+ free_incoming_request (ir_head);
+ GNUNET_assert (0 == ir_total);
while (NULL != (lle = lle_head))
{
GNUNET_CONTAINER_DLL_remove (lle_head, lle_tail, lle);
GNUNET_CONTAINER_multipeermap_iterate (dv_routes, &free_dv_routes_cb, NULL);
GNUNET_CONTAINER_multipeermap_destroy (dv_routes);
dv_routes = NULL;
- GNUNET_CONTAINER_multipeermap_iterate (ephemeral_map,
- &free_ephemeral_cb,
- NULL);
- GNUNET_CONTAINER_multipeermap_destroy (ephemeral_map);
- ephemeral_map = NULL;
- GNUNET_CONTAINER_heap_destroy (ephemeral_heap);
- ephemeral_heap = NULL;
}
neighbours = GNUNET_CONTAINER_multipeermap_create (1024, GNUNET_YES);
links = GNUNET_CONTAINER_multipeermap_create (512, GNUNET_YES);
dv_routes = GNUNET_CONTAINER_multipeermap_create (1024, GNUNET_YES);
- ephemeral_map = GNUNET_CONTAINER_multipeermap_create (32, GNUNET_YES);
- ephemeral_heap =
- GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
dvlearn_map = GNUNET_CONTAINER_multishortmap_create (2 * MAX_DV_LEARN_PENDING,
GNUNET_YES);
validation_map = GNUNET_CONTAINER_multipeermap_create (1024, GNUNET_YES);
projects / oweals / gnunet.git / blobdiff