#include "platform.h"
#include "gnunet_util_lib.h"
+#include "gnunet_signatures.h"
#include "gnunet_statistics_service.h"
-#include "mesh_protocol_enc.h"
+#include "mesh_protocol.h"
+#include "mesh_path.h"
#include "gnunet-service-mesh_tunnel.h"
#include "gnunet-service-mesh_connection.h"
#include "gnunet-service-mesh_channel.h"
#include "gnunet-service-mesh_peer.h"
-#include "mesh_path.h"
#define LOG(level, ...) GNUNET_log_from(level,"mesh-tun",__VA_ARGS__)
+#define REKEY_WAIT GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 5)
/******************************************************************************/
/******************************** STRUCTS **********************************/
struct MeshConnection *c;
};
+/**
+ * Structure used during a Key eXchange.
+ */
+struct MeshTunnelKXCtx
+{
+ /**
+ * Decryption ("their") old key, for decrypting traffic sent by the
+ * other end before the key exchange started.
+ */
+ struct GNUNET_CRYPTO_SymmetricSessionKey d_key_old;
+
+ /**
+ * Challenge to send in a ping and expect in the pong.
+ */
+ uint32_t challenge;
+};
+
/**
* Struct containing all information regarding a tunnel to a peer.
*/
enum MeshTunnel3State state;
/**
- * Local peer ephemeral private key
- */
- struct GNUNET_CRYPTO_EddsaPrivateKey *my_eph_key;
-
- /**
- * Local peer ephemeral public key
- */
- struct GNUNET_CRYPTO_EddsaPublicKey *my_eph;
-
- /**
- * Remote peer's public key.
+ * Key eXchange context.
*/
- struct GNUNET_CRYPTO_EddsaPublicKey *peers_eph;
+ struct MeshTunnelKXCtx *kx_ctx;
/**
* Encryption ("our") key.
*/
struct GNUNET_CRYPTO_SymmetricSessionKey d_key;
+ /**
+ * Task to start the rekey process.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier rekey_task;
+
/**
* Paths that are actively used to reach the destination peer.
*/
*/
MESH_ChannelNumber next_chid;
- /**
- * Pending message count.
- */
- int pending_messages;
-
/**
* Destroy flag: if true, destroy on last message.
*/
/**
* Queued messages, to transmit once tunnel gets connected.
*/
- struct MeshTunnelQueue *tq_head;
- struct MeshTunnelQueue *tq_tail;
+ struct MeshTunnelDelayed *tq_head;
+ struct MeshTunnelDelayed *tq_tail;
};
/**
- * Struct used to queue messages in a tunnel.
+ * Struct used to save messages in a non-ready tunnel to send once connected.
*/
-struct MeshTunnelQueue
+struct MeshTunnelDelayed
{
/**
* DLL
*/
- struct MeshTunnelQueue *next;
- struct MeshTunnelQueue *prev;
+ struct MeshTunnelDelayed *next;
+ struct MeshTunnelDelayed *prev;
/**
* Channel.
/* struct GNUNET_MessageHeader *msg; */
};
+
+/**
+ * Handle for messages queued but not yet sent.
+ */
+struct MeshTunnel3Queue
+{
+ /**
+ * Connection queue handle, to cancel if necessary.
+ */
+ struct MeshConnectionQueue *q;
+
+ /**
+ * Continuation to call once sent.
+ */
+ GMT_sent cont;
+
+ /**
+ * Closure for @c cont.
+ */
+ void *cont_cls;
+};
+
+
/******************************************************************************/
/******************************* GLOBALS ***********************************/
/******************************************************************************/
*/
extern struct GNUNET_PeerIdentity my_full_id;
+
+/**
+ * Set of all tunnels, in order to trigger a new exchange on rekey.
+ * Indexed by peer's ID.
+ */
+static struct GNUNET_CONTAINER_MultiPeerMap *tunnels;
+
/**
* Default TTL for payload packets.
*/
*/
const static struct GNUNET_CRYPTO_EddsaPrivateKey *my_private_key;
+/**
+ * Own ephemeral private key.
+ */
+static struct GNUNET_CRYPTO_EcdhePrivateKey *my_ephemeral_key;
+
+/**
+ * Cached message used to perform a key exchange.
+ */
+static struct GNUNET_MESH_KX_Ephemeral kx_msg;
+
+/**
+ * Task to generate a new ephemeral key.
+ */
+static GNUNET_SCHEDULER_TaskIdentifier rekey_task;
+
+/**
+ * Rekey period.
+ */
+static struct GNUNET_TIME_Relative rekey_period;
/******************************************************************************/
/******************************** STATIC ***********************************/
return "MESH_TUNNEL3_SEARCHING";
case MESH_TUNNEL3_WAITING:
return "MESH_TUNNEL3_WAITING";
+ case MESH_TUNNEL3_KEY_SENT:
+ return "MESH_TUNNEL3_KEY_SENT";
case MESH_TUNNEL3_READY:
return "MESH_TUNNEL3_READY";
case MESH_TUNNEL3_RECONNECTING:
return "MESH_TUNNEL3_RECONNECTING";
+ case MESH_TUNNEL3_REKEY:
+ return "MESH_TUNNEL3_REKEY";
default:
sprintf (buf, "%u (UNKNOWN STATE)", s);
}
}
+
+/**
+ * Ephemeral key message purpose size.
+ *
+ * @return Size of the part of the ephemeral key message that must be signed.
+ */
+size_t
+ephemeral_purpose_size (void)
+{
+ return sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
+ sizeof (struct GNUNET_TIME_AbsoluteNBO) +
+ sizeof (struct GNUNET_TIME_AbsoluteNBO) +
+ sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) +
+ sizeof (struct GNUNET_PeerIdentity);
+}
+
+
+/**
+ * Size of the encrypted part of a ping message.
+ *
+ * @return Size of the encrypted part of a ping message.
+ */
+size_t
+ping_encryption_size (void)
+{
+ return sizeof (struct GNUNET_PeerIdentity) + sizeof (uint32_t);
+}
+
+
+/**
+ * Get the channel's buffer. ONLY FOR NON-LOOPBACK CHANNELS!!
+ *
+ * @param tch Tunnel's channel handle.
+ *
+ * @return Amount of messages the channel can still buffer towards the client.
+ */
+static unsigned int
+get_channel_buffer (const struct MeshTChannel *tch)
+{
+ int fwd;
+
+ /* If channel is outgoing, is origin in the FWD direction and fwd is YES */
+ fwd = GMCH_is_origin (tch->ch, GNUNET_YES);
+
+ return GMCH_get_buffer (tch->ch, fwd);
+}
+
+
+/**
+ * Get the channel's allowance status.
+ *
+ * @param tch Tunnel's channel handle.
+ *
+ * @return #GNUNET_YES if we allowed the client to send data to us.
+ */
+static int
+get_channel_allowed (const struct MeshTChannel *tch)
+{
+ int fwd;
+
+ /* If channel is outgoing, is origin in the FWD direction and fwd is YES */
+ fwd = GMCH_is_origin (tch->ch, GNUNET_YES);
+
+ return GMCH_get_allowed (tch->ch, fwd);
+}
+
+
+/**
+ * Get the connection's buffer.
+ *
+ * @param tc Tunnel's connection handle.
+ *
+ * @return Amount of messages the connection can still buffer.
+ */
+static unsigned int
+get_connection_buffer (const struct MeshTConnection *tc)
+{
+ int fwd;
+
+ /* If connection is outgoing, is origin in the FWD direction and fwd is YES */
+ fwd = GMC_is_origin (tc->c, GNUNET_YES);
+
+ return GMC_get_buffer (tc->c, fwd);
+}
+
+
+/**
+ * Get the connection's allowance.
+ *
+ * @param tc Tunnel's connection handle.
+ *
+ * @return Amount of messages we have allowed the next peer to send us.
+ */
+static unsigned int
+get_connection_allowed (const struct MeshTConnection *tc)
+{
+ int fwd;
+
+ /* If connection is outgoing, is origin in the FWD direction and fwd is YES */
+ fwd = GMC_is_origin (tc->c, GNUNET_YES);
+
+ return GMC_get_allowed (tc->c, fwd);
+}
+
+
+/**
+ * Check that a ephemeral key message s well formed and correctly signed.
+ *
+ * @param t Tunnel on which the message came.
+ * @param msg The ephemeral key message.
+ *
+ * @return GNUNET_OK if message is fine, GNUNET_SYSERR otherwise.
+ */
+int
+check_ephemeral (struct MeshTunnel3 *t,
+ const struct GNUNET_MESH_KX_Ephemeral *msg)
+{
+ /* Check message size */
+ if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_KX_Ephemeral))
+ return GNUNET_SYSERR;
+
+ /* Check signature size */
+ if (ntohl (msg->purpose.size) != ephemeral_purpose_size ())
+ return GNUNET_SYSERR;
+
+ /* Check origin */
+ if (0 != memcmp (&msg->origin_identity,
+ GMP_get_id (t->peer),
+ sizeof (struct GNUNET_PeerIdentity)))
+ return GNUNET_SYSERR;
+
+ /* Check signature */
+ if (GNUNET_OK !=
+ GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_MESH_KX,
+ &msg->purpose,
+ &msg->signature,
+ &msg->origin_identity.public_key))
+ return GNUNET_SYSERR;
+
+ return GNUNET_OK;
+}
+
+
+/**
+ * Encrypt data with the tunnel key.
+ *
+ * @param t Tunnel whose key to use.
+ * @param dst Destination for the encrypted data.
+ * @param src Source of the plaintext. Can overlap with @c dst.
+ * @param size Size of the plaintext.
+ * @param iv Initialization Vector to use.
+ */
+static int
+t_encrypt (struct MeshTunnel3 *t,
+ void *dst, const void *src,
+ size_t size, uint32_t iv)
+{
+ struct GNUNET_CRYPTO_SymmetricInitializationVector siv;
+
+ GNUNET_CRYPTO_symmetric_derive_iv (&siv, &t->e_key, &iv, sizeof (uint32_t), NULL);
+ return GNUNET_CRYPTO_symmetric_encrypt (src, size, &t->e_key, &siv, dst);
+}
+
+
+/**
+ * Decrypt data with the tunnel key.
+ *
+ * @param t Tunnel whose key to use.
+ * @param dst Destination for the plaintext.
+ * @param src Source of the encrypted data. Can overlap with @c dst.
+ * @param size Size of the encrypted data.
+ * @param iv Initialization Vector to use.
+ */
+static int
+t_decrypt (struct MeshTunnel3 *t,
+ void *dst, const void *src,
+ size_t size, uint32_t iv)
+{
+ struct GNUNET_CRYPTO_SymmetricInitializationVector siv;
+
+ GNUNET_CRYPTO_symmetric_derive_iv (&siv, &t->d_key, &iv, sizeof (uint32_t), NULL);
+ return GNUNET_CRYPTO_symmetric_decrypt (src, size, &t->d_key, &siv, dst);
+}
+
+
+/**
+ * Create key material by doing ECDH on the local and remote ephemeral keys.
+ *
+ * @param key_material Where to store the key material.
+ * @param ephemeral_key Peer's public ephemeral key.
+ */
+void
+derive_key_material (struct GNUNET_HashCode *key_material,
+ const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral_key)
+{
+ if (GNUNET_OK !=
+ GNUNET_CRYPTO_ecc_ecdh (my_ephemeral_key,
+ ephemeral_key,
+ key_material))
+ {
+ GNUNET_break (0);
+ }
+}
+
+/**
+ * Create a symmetic key from the identities of both ends and the key material
+ * from ECDH.
+ *
+ * @param key Destination for the generated key.
+ * @param sender ID of the peer that will encrypt with @c key.
+ * @param receiver ID of the peer that will decrypt with @c key.
+ * @param key_material Hash created with ECDH with the ephemeral keys.
+ */
+void
+derive_symmertic (struct GNUNET_CRYPTO_SymmetricSessionKey *key,
+ const struct GNUNET_PeerIdentity *sender,
+ const struct GNUNET_PeerIdentity *receiver,
+ const struct GNUNET_HashCode *key_material)
+{
+ const char salt[] = "MESH kx salt";
+
+ GNUNET_CRYPTO_kdf (key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
+ salt, sizeof (salt),
+ key_material, sizeof (struct GNUNET_HashCode),
+ sender, sizeof (struct GNUNET_PeerIdentity),
+ receiver, sizeof (struct GNUNET_PeerIdentity),
+ NULL);
+}
+
/**
* Pick a connection on which send the next data message.
*
* @param t Tunnel on which to send the message.
- * @param fwd Is this a fwd message?
*
* @return The connection on which to send the next message.
*/
static struct MeshConnection *
-tunnel_get_connection (struct MeshTunnel3 *t, int fwd)
+tunnel_get_connection (struct MeshTunnel3 *t)
{
struct MeshTConnection *iter;
struct MeshConnection *best;
GNUNET_h2s (GMC_get_id (iter->c)), GMC_get_state (iter->c));
if (MESH_CONNECTION_READY == GMC_get_state (iter->c))
{
- qn = GMC_get_qn (iter->c, fwd);
+ qn = GMC_get_qn (iter->c, GMC_is_origin (iter->c, GNUNET_YES));
LOG (GNUNET_ERROR_TYPE_DEBUG, " q_n %u, \n", qn);
if (qn < lowest_q)
{
}
-void
+/**
+ * Send all cached messages that we can, tunnel is online.
+ *
+ * @param t Tunnel that holds the messages. Cannot be loopback.
+ */
+static void
+send_queued_data (struct MeshTunnel3 *t)
+{
+ struct MeshTunnelDelayed *tq;
+ struct MeshTunnelDelayed *next;
+ unsigned int room;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "GMT_send_queued_data on tunnel %s\n",
+ GMT_2s (t));
+
+ if (GMT_is_loopback (t))
+ {
+ GNUNET_break (0);
+ return;
+ }
+
+ room = GMT_get_connections_buffer (t);
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer space: %u\n", room);
+ for (tq = t->tq_head; NULL != tq && room > 0; tq = next)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " data on channel %s\n", GMCH_2s (tq->ch));
+ next = tq->next;
+ room--;
+ GNUNET_CONTAINER_DLL_remove (t->tq_head, t->tq_tail, tq);
+ GMCH_send_prebuilt_message ((struct GNUNET_MessageHeader *) &tq[1],
+ tq->ch, GMCH_is_origin (tq->ch, GNUNET_YES),
+ GNUNET_NO);
+
+ GNUNET_free (tq);
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "GMT_send_queued_data end\n",
+ GMP_2s (t->peer));
+}
+
+
+
+
+/**
+ * Cache a message to be sent once tunnel is online.
+ *
+ * @param t Tunnel to hold the message.
+ * @param ch Channel the message is about.
+ * @param msg Message itself (copy will be made).
+ */
+static void
+queue_data (struct MeshTunnel3 *t,
+ struct MeshChannel *ch,
+ const struct GNUNET_MessageHeader *msg)
+{
+ struct MeshTunnelDelayed *tq;
+ uint16_t size = ntohs (msg->size);
+
+ if (MESH_TUNNEL3_READY == t->state)
+ {
+ GNUNET_break (0);
+ return;
+ }
+
+ tq = GNUNET_malloc (sizeof (struct MeshTunnelDelayed) + size);
+
+ tq->ch = ch;
+ memcpy (&tq[1], msg, size);
+ GNUNET_CONTAINER_DLL_insert_tail (t->tq_head, t->tq_tail, tq);
+}
+
+
+
+/**
+ * Sends key exchange message on a tunnel, choosing the best connection.
+ * Should not be called on loopback tunnels.
+ *
+ * @param t Tunnel on which this message is transmitted.
+ * @param message Message to send. Function modifies it.
+ */
+static void
+send_kx (struct MeshTunnel3 *t,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct MeshConnection *c;
+ struct GNUNET_MESH_KX *msg;
+ size_t size = ntohs (message->size);
+ char cbuf[sizeof (struct GNUNET_MESH_KX) + size];
+ uint16_t type;
+ int fwd;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT KX on Tunnel %s\n", GMT_2s (t));
+
+ /* Avoid loopback. */
+ if (GMT_is_loopback (t))
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " loopback!\n");
+ GNUNET_break (0);
+ return;
+ }
+
+ /* Must have a connection. */
+ if (NULL == t->connection_head)
+ {
+ GNUNET_break (0);
+ return;
+ }
+
+ msg = (struct GNUNET_MESH_KX *) cbuf;
+ msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX);
+ msg->header.size = htons (sizeof (struct GNUNET_MESH_KX) + size);
+ c = tunnel_get_connection (t);
+ if (NULL == c)
+ {
+ GNUNET_break (GNUNET_YES == t->destroy);
+ return;
+ }
+ type = ntohs (message->type);
+ switch (type)
+ {
+ case GNUNET_MESSAGE_TYPE_MESH_KX_EPHEMERAL:
+ case GNUNET_MESSAGE_TYPE_MESH_KX_PING:
+ case GNUNET_MESSAGE_TYPE_MESH_KX_PONG:
+ msg->reserved = htonl (0);
+ memcpy (&msg[1], message, size);
+ break;
+ default:
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n",
+ GNUNET_MESH_DEBUG_M2S (type));
+ GNUNET_break (0);
+ }
+
+ fwd = GMC_is_origin (t->connection_head->c, GNUNET_YES);
+ /* TODO save handle and cancel in case of a unneeded retransmission */
+ GMC_send_prebuilt_message (&msg->header, c, fwd, NULL, NULL);
+}
+
+
+/**
+ * Send the ephemeral key on a tunnel.
+ *
+ * @param t Tunnel on which to send the key.
+ */
+static void
+send_ephemeral (struct MeshTunnel3 *t)
+{
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "%s()\n", __FUNCTION__);
+
+ kx_msg.sender_status = htonl (t->state);
+ send_kx (t, &kx_msg.header);
+}
+
+/**
+ * Send a ping message on a tunnel.
+ *
+ * @param t Tunnel on which to send the ping.
+ */
+static void
+send_ping (struct MeshTunnel3 *t)
+{
+ struct GNUNET_MESH_KX_Ping msg;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "%s()\n", __FUNCTION__);
+ msg.header.size = htons (sizeof (msg));
+ msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX_PING);
+ msg.iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
+ msg.target = *GMP_get_id (t->peer);
+ msg.nonce = t->kx_ctx->challenge;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " sending %u\n", msg.nonce);
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " towards %s\n", GNUNET_i2s (&msg.target));
+ t_encrypt (t, &msg.target, &msg.target, ping_encryption_size(), msg.iv);
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " e sending %u\n", msg.nonce);
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " e towards %s\n", GNUNET_i2s (&msg.target));
+
+ send_kx (t, &msg.header);
+}
+
+
+/**
+ * Send a pong message on a tunnel.
+ *
+ * @param t Tunnel on which to send the pong.
+ * @param challenge Value sent in the ping that we have to send back.
+ */
+static void
+send_pong (struct MeshTunnel3 *t, uint32_t challenge)
+{
+ struct GNUNET_MESH_KX_Pong msg;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "%s()\n", __FUNCTION__);
+ msg.header.size = htons (sizeof (msg));
+ msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX_PONG);
+ msg.iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
+ msg.nonce = challenge;
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " sending %u\n", msg.nonce);
+ t_encrypt (t, &msg.nonce, &msg.nonce, sizeof (msg.nonce), msg.iv);
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " e sending %u\n", msg.nonce);
+
+ send_kx (t, &msg.header);
+}
+
+
+/**
+ * Initiate a rekey with the remote peer.
+ *
+ * @param cls Closure (tunnel).
+ * @param tc TaskContext.
+ */
+static void
+rekey_tunnel (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct MeshTunnel3 *t = cls;
+
+ t->rekey_task = GNUNET_SCHEDULER_NO_TASK;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Re-key Tunnel\n");
+ if (NULL != tc && 0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
+ return;
+
+ if (NULL == t->kx_ctx)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " new kx ctx\n");
+ t->kx_ctx = GNUNET_new (struct MeshTunnelKXCtx);
+ t->kx_ctx->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
+ UINT32_MAX);
+ t->kx_ctx->d_key_old = t->d_key;
+ }
+ send_ephemeral (t);
+ if (MESH_TUNNEL3_READY == t->state || MESH_TUNNEL3_REKEY == t->state)
+ {
+ send_ping (t);
+ t->state = MESH_TUNNEL3_REKEY;
+ }
+ else if (MESH_TUNNEL3_WAITING == t->state)
+ {
+ t->state = MESH_TUNNEL3_KEY_SENT;
+ }
+ else
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Unexpected state %u\n", t->state);
+ }
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " next call in %s\n",
+ GNUNET_STRINGS_relative_time_to_string (REKEY_WAIT, GNUNET_YES));
+ t->rekey_task = GNUNET_SCHEDULER_add_delayed (REKEY_WAIT, &rekey_tunnel, t);
+}
+
+
+/**
+ * Out ephemeral key has changed, create new session key on all tunnels.
+ *
+ * @param cls Closure (size of the hashmap).
+ * @param key Current public key.
+ * @param value Value in the hash map (tunnel).
+ *
+ * @return #GNUNET_YES, so we should continue to iterate,
+ */
+static int
+rekey_iterator (void *cls,
+ const struct GNUNET_PeerIdentity *key,
+ void *value)
+{
+ struct MeshTunnel3 *t = value;
+ struct GNUNET_TIME_Relative delay;
+ long n = (long) cls;
+ uint32_t r;
+
+ if (GNUNET_SCHEDULER_NO_TASK != t->rekey_task)
+ return GNUNET_YES;
+
+ r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, (uint32_t) n * 100);
+ delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, r);
+ t->rekey_task = GNUNET_SCHEDULER_add_delayed (delay, &rekey_tunnel, t);
+
+ return GNUNET_YES;
+}
+
+
+/**
+ * Create a new ephemeral key and key message, schedule next rekeying.
+ *
+ * @param cls Closure (unused).
+ * @param tc TaskContext.
+ */
+static void
+rekey (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct GNUNET_TIME_Absolute time;
+ long n;
+
+ rekey_task = GNUNET_SCHEDULER_NO_TASK;
+
+ if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
+ return;
+
+ GNUNET_free_non_null (my_ephemeral_key);
+ my_ephemeral_key = GNUNET_CRYPTO_ecdhe_key_create ();
+
+ time = GNUNET_TIME_absolute_get ();
+ kx_msg.creation_time = GNUNET_TIME_absolute_hton (time);
+ time = GNUNET_TIME_absolute_add (time, rekey_period);
+ time = GNUNET_TIME_absolute_add (time, GNUNET_TIME_UNIT_MINUTES);
+ kx_msg.expiration_time = GNUNET_TIME_absolute_hton (time);
+ GNUNET_CRYPTO_ecdhe_key_get_public (my_ephemeral_key, &kx_msg.ephemeral_key);
+
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CRYPTO_eddsa_sign (my_private_key,
+ &kx_msg.purpose,
+ &kx_msg.signature));
+
+ n = (long) GNUNET_CONTAINER_multipeermap_size (tunnels);
+ GNUNET_CONTAINER_multipeermap_iterate (tunnels, &rekey_iterator, (void *) n);
+
+ rekey_task = GNUNET_SCHEDULER_add_delayed (rekey_period, &rekey, NULL);
+}
+
+
+/**
+ * Called only on shutdown, destroy every tunnel.
+ *
+ * @param cls Closure (unused).
+ * @param key Current public key.
+ * @param value Value in the hash map (tunnel).
+ *
+ * @return #GNUNET_YES, so we should continue to iterate,
+ */
+static int
+destroy_iterator (void *cls,
+ const struct GNUNET_PeerIdentity *key,
+ void *value)
+{
+ struct MeshTunnel3 *t = value;
+
+ GMT_destroy (t);
+ return GNUNET_YES;
+}
+
+
+/**
+ * Demultiplex data per channel and call appropriate channel handler.
+ *
+ * @param t Tunnel on which the data came.
+ * @param msg Data message.
+ * @param fwd Is this message fwd? This only is meaningful in loopback channels.
+ * #GNUNET_YES if message is FWD on the respective channel (loopback)
+ * #GNUNET_NO if message is BCK on the respective channel (loopback)
+ * #GNUNET_SYSERR if message on a one-ended channel (remote)
+ */
+static void
handle_data (struct MeshTunnel3 *t,
const struct GNUNET_MESH_Data *msg,
int fwd)
GMCH_handle_data (ch, msg, fwd);
}
-void
+
+/**
+ * Demultiplex data ACKs per channel and update appropriate channel buffer info.
+ *
+ * @param t Tunnel on which the DATA ACK came.
+ * @param msg DATA ACK message.
+ * @param fwd Is this message fwd? This only is meaningful in loopback channels.
+ * #GNUNET_YES if message is FWD on the respective channel (loopback)
+ * #GNUNET_NO if message is BCK on the respective channel (loopback)
+ * #GNUNET_SYSERR if message on a one-ended channel (remote)
+ */
+static void
handle_data_ack (struct MeshTunnel3 *t,
const struct GNUNET_MESH_DataACK *msg,
int fwd)
GMCH_handle_data_ack (ch, msg, fwd);
}
-void
+
+/**
+ * Handle channel create.
+ *
+ * @param t Tunnel on which the data came.
+ * @param msg Data message.
+ */
+static void
handle_ch_create (struct MeshTunnel3 *t,
- const struct GNUNET_MESH_ChannelCreate *msg,
- int fwd)
+ const struct GNUNET_MESH_ChannelCreate *msg)
{
- struct MeshTChannel *tch;
struct MeshChannel *ch;
size_t size;
/* Check channel */
ch = GMT_get_channel (t, ntohl (msg->chid));
- if (NULL != ch)
+ if (NULL != ch && ! GMT_is_loopback (t))
{
/* Probably a retransmission, safe to ignore */
LOG (GNUNET_ERROR_TYPE_DEBUG, " already exists...\n");
}
else
{
- ch = GMCH_handle_create (msg, fwd);
+ ch = GMCH_handle_create (t, msg);
+ }
+ if (NULL != ch)
+ GMT_add_channel (t, ch);
+}
+
+
+
+/**
+ * Handle channel NACK: check correctness and call channel handler for NACKs.
+ *
+ * @param t Tunnel on which the NACK came.
+ * @param msg NACK message.
+ */
+static void
+handle_ch_nack (struct MeshTunnel3 *t,
+ const struct GNUNET_MESH_ChannelManage *msg)
+{
+ struct MeshChannel *ch;
+ size_t size;
+
+ /* Check size */
+ size = ntohs (msg->header.size);
+ if (size != sizeof (struct GNUNET_MESH_ChannelManage))
+ {
+ GNUNET_break (0);
+ return;
+ }
+
+ /* Check channel */
+ ch = GMT_get_channel (t, ntohl (msg->chid));
+ if (NULL == ch)
+ {
+ GNUNET_STATISTICS_update (stats, "# channel NACK on unknown channel",
+ 1, GNUNET_NO);
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
+ ntohl (msg->chid));
+ return;
}
- tch = GNUNET_new (struct MeshTChannel);
- tch->ch = ch;
- GNUNET_CONTAINER_DLL_insert (t->channel_head, t->channel_tail, tch);
+ GMCH_handle_nack (ch);
}
-void
+
+/**
+ * Handle a CHANNEL ACK (SYNACK/ACK).
+ *
+ * @param t Tunnel on which the CHANNEL ACK came.
+ * @param msg CHANNEL ACK message.
+ * @param fwd Is this message fwd? This only is meaningful in loopback channels.
+ * #GNUNET_YES if message is FWD on the respective channel (loopback)
+ * #GNUNET_NO if message is BCK on the respective channel (loopback)
+ * #GNUNET_SYSERR if message on a one-ended channel (remote)
+ */
+static void
handle_ch_ack (struct MeshTunnel3 *t,
const struct GNUNET_MESH_ChannelManage *msg,
int fwd)
GMCH_handle_ack (ch, msg, fwd);
}
-void
+
+
+/**
+ * Handle a channel destruction message.
+ *
+ * @param t Tunnel on which the message came.
+ * @param msg Channel destroy message.
+ * @param fwd Is this message fwd? This only is meaningful in loopback channels.
+ * #GNUNET_YES if message is FWD on the respective channel (loopback)
+ * #GNUNET_NO if message is BCK on the respective channel (loopback)
+ * #GNUNET_SYSERR if message on a one-ended channel (remote)
+ */
+static void
handle_ch_destroy (struct MeshTunnel3 *t,
const struct GNUNET_MESH_ChannelManage *msg,
int fwd)
{
- struct MeshChannel *ch;
- size_t size;
+ struct MeshChannel *ch;
+ size_t size;
+
+ /* Check size */
+ size = ntohs (msg->header.size);
+ if (size != sizeof (struct GNUNET_MESH_ChannelManage))
+ {
+ GNUNET_break (0);
+ return;
+ }
+
+ /* Check channel */
+ ch = GMT_get_channel (t, ntohl (msg->chid));
+ if (NULL == ch)
+ {
+ /* Probably a retransmission, safe to ignore */
+ return;
+ }
+
+ GMCH_handle_destroy (ch, msg, fwd);
+}
+
+
+/**
+ * The peer's ephemeral key has changed: update the symmetrical keys.
+ *
+ * @param t Tunnel this message came on.
+ * @param msg Key eXchange message.
+ */
+static void
+handle_ephemeral (struct MeshTunnel3 *t,
+ const struct GNUNET_MESH_KX_Ephemeral *msg)
+{
+ struct GNUNET_HashCode km;
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " ephemeral key message\n");
+
+ if (GNUNET_OK != check_ephemeral (t, msg))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ derive_key_material (&km, &msg->ephemeral_key);
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " km is %s\n", GNUNET_h2s (&km));
+ derive_symmertic (&t->e_key, &my_full_id, GMP_get_id (t->peer), &km);
+ derive_symmertic (&t->d_key, GMP_get_id (t->peer), &my_full_id, &km);
+ if (MESH_TUNNEL3_KEY_SENT == t->state)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " our key was sent, send ping\n");
+ send_ping (t);
+ t->state = MESH_TUNNEL3_REKEY;
+ }
+}
+
+
+/**
+ * Peer wants to check our symmetrical keys by sending an encrypted challenge.
+ * Answer with by retransmitting the challenge with the "opposite" key.
+ *
+ * @param t Tunnel this message came on.
+ * @param msg Key eXchange Ping message.
+ */
+static void
+handle_ping (struct MeshTunnel3 *t,
+ const struct GNUNET_MESH_KX_Ping *msg)
+{
+ struct GNUNET_MESH_KX_Ping res;
+
+ if (ntohs (msg->header.size) != sizeof (res))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " ping message\n");
+ t_decrypt (t, &res.target, &msg->target, ping_encryption_size (), msg->iv);
+ if (0 != memcmp (&my_full_id, &res.target, sizeof (my_full_id)))
+ {
+ GNUNET_break_op (0);
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " e got %u\n", msg->nonce);
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " e towards %s\n", GNUNET_i2s (&msg->target));
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " got %u\n", res.nonce);
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " towards %s\n", GNUNET_i2s (&res.target));
+ return;
+ }
+
+ send_pong (t, res.nonce);
+}
+
+
+/**
+ * Peer has answer to our challenge.
+ * If answer is successful, consider the key exchange finished and clean
+ * up all related state.
+ *
+ * @param t Tunnel this message came on.
+ * @param msg Key eXchange Pong message.
+ */
+static void
+handle_pong (struct MeshTunnel3 *t,
+ const struct GNUNET_MESH_KX_Pong *msg)
+{
+ uint32_t challenge;
- /* Check size */
- size = ntohs (msg->header.size);
- if (size != sizeof (struct GNUNET_MESH_ChannelManage))
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "PONG received\n");
+ if (GNUNET_SCHEDULER_NO_TASK == t->rekey_task)
{
- GNUNET_break (0);
+ GNUNET_break_op (0);
return;
}
+ t_decrypt (t, &challenge, &msg->nonce, sizeof (uint32_t), msg->iv);
- /* Check channel */
- ch = GMT_get_channel (t, ntohl (msg->chid));
- if (NULL == ch)
+ if (challenge != t->kx_ctx->challenge)
{
- /* Probably a retransmission, safe to ignore */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Wrong PONG challenge: %u (e: %u). Expected: %u.\n",
+ challenge, msg->nonce, t->kx_ctx->challenge);
+ GNUNET_break_op (0);
return;
}
-
- GMCH_handle_destroy (ch, msg, fwd);
+ GNUNET_SCHEDULER_cancel (t->rekey_task);
+ t->rekey_task = GNUNET_SCHEDULER_NO_TASK;
+ GNUNET_free (t->kx_ctx);
+ t->kx_ctx = NULL;
+ t->state = MESH_TUNNEL3_READY;
+ send_queued_data (t);
}
-/******************************************************************************/
-/******************************** API ***********************************/
-/******************************************************************************/
/**
* Demultiplex by message type and call appropriate handler for a message
*
* @param t Tunnel this message came on.
* @param msgh Message header.
- * @param fwd Is this message fwd?
+ * @param fwd Is this message fwd? This only is meaningful in loopback channels.
+ * #GNUNET_YES if message is FWD on the respective channel (loopback)
+ * #GNUNET_NO if message is BCK on the respective channel (loopback)
+ * #GNUNET_SYSERR if message on a one-ended channel (remote)
*/
-void
-GMT_handle_decrypted (struct MeshTunnel3 *t,
- const struct GNUNET_MessageHeader *msgh,
- int fwd)
+static void
+handle_decrypted (struct MeshTunnel3 *t,
+ const struct GNUNET_MessageHeader *msgh,
+ int fwd)
{
uint16_t type;
case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
handle_ch_create (t,
- (struct GNUNET_MESH_ChannelCreate *) msgh,
- fwd);
+ (struct GNUNET_MESH_ChannelCreate *) msgh);
+ break;
+
+ case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_NACK:
+ handle_ch_nack (t,
+ (struct GNUNET_MESH_ChannelManage *) msgh);
break;
case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
}
}
+/******************************************************************************/
+/******************************** API ***********************************/
+/******************************************************************************/
/**
- * Cache a message to be sent once tunnel is online.
+ * Decrypt and demultiplex by message type. Call appropriate handler
+ * for every message.
*
- * @param t Tunnel to hold the message.
- * @param ch Channel the message is about.
- * @param msg Message itself (copy will be made).
- * @param fwd Is this fwd?
+ * @param t Tunnel this message came on.
+ * @param msg Encrypted message.
*/
void
-GMT_queue_data (struct MeshTunnel3 *t,
- struct MeshChannel *ch,
- struct GNUNET_MessageHeader *msg,
- int fwd)
+GMT_handle_encrypted (struct MeshTunnel3 *t,
+ const struct GNUNET_MESH_Encrypted *msg)
{
- struct MeshTunnelQueue *tq;
- uint16_t size = ntohs (msg->size);
-
- tq = GNUNET_malloc (sizeof (struct MeshTunnelQueue) + size);
-
- tq->ch = ch;
- memcpy (&tq[1], msg, size);
- GNUNET_CONTAINER_DLL_insert_tail (t->tq_head, t->tq_tail, tq);
-
- if (MESH_TUNNEL3_READY == t->state)
- GMT_send_queued_data (t, fwd);
+ size_t size = ntohs (msg->header.size);
+ size_t payload_size = size - sizeof (struct GNUNET_MESH_Encrypted);
+ size_t decrypted_size;
+ char cbuf [payload_size];
+ struct GNUNET_MessageHeader *msgh;
+ unsigned int off;
+
+ decrypted_size = t_decrypt (t, cbuf, &msg[1], payload_size, msg->iv);
+ off = 0;
+ while (off < decrypted_size)
+ {
+ msgh = (struct GNUNET_MessageHeader *) &cbuf[off];
+ handle_decrypted (t, msgh, GNUNET_SYSERR);
+ off += ntohs (msgh->size);
+ }
}
/**
- * Send all cached messages that we can, tunnel is online.
+ * Demultiplex an encapsulated KX message by message type.
*
- * @param t Tunnel that holds the messages.
- * @param fwd Is this fwd?
+ * @param t Tunnel on which the message came.
+ * @param message Payload of KX message.
*/
void
-GMT_send_queued_data (struct MeshTunnel3 *t, int fwd)
+GMT_handle_kx (struct MeshTunnel3 *t,
+ const struct GNUNET_MessageHeader *message)
{
- struct MeshTunnelQueue *tq;
- struct MeshTunnelQueue *next;
- unsigned int room;
+ uint16_t type;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "GMT_send_queued_data on tunnel %s\n",
- GMP_2s (t->peer));
- room = GMT_get_buffer (t, fwd);
- LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer space: %u\n", room);
- for (tq = t->tq_head; NULL != tq && room > 0; tq = next)
+ type = ntohs (message->type);
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "kx message received\n", type);
+ switch (type)
{
- next = tq->next;
- room--;
- GNUNET_CONTAINER_DLL_remove (t->tq_head, t->tq_tail, tq);
- GMCH_send_prebuilt_message ((struct GNUNET_MessageHeader *) &tq[1],
- tq->ch, fwd);
+ case GNUNET_MESSAGE_TYPE_MESH_KX_EPHEMERAL:
+ handle_ephemeral (t, (struct GNUNET_MESH_KX_Ephemeral *) message);
+ break;
- GNUNET_free (tq);
+ case GNUNET_MESSAGE_TYPE_MESH_KX_PING:
+ handle_ping (t, (struct GNUNET_MESH_KX_Ping *) message);
+ break;
+
+ case GNUNET_MESSAGE_TYPE_MESH_KX_PONG:
+ handle_pong (t, (struct GNUNET_MESH_KX_Pong *) message);
+ break;
+
+ default:
+ GNUNET_break_op (0);
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "kx message not known (%u)\n", type);
}
}
* Initialize the tunnel subsystem.
*
* @param c Configuration handle.
- * @param id Peer identity.
* @param key ECC private key, to derive all other keys and do crypto.
*/
void
GMT_init (const struct GNUNET_CONFIGURATION_Handle *c,
const struct GNUNET_CRYPTO_EddsaPrivateKey *key)
{
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
&default_ttl))
"MESH", "DEFAULT_TTL", "USING DEFAULT");
default_ttl = 64;
}
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REKEY_PERIOD",
+ &rekey_period))
+ {
+ rekey_period = GNUNET_TIME_UNIT_DAYS;
+ }
+
my_private_key = key;
+ kx_msg.header.size = htons (sizeof (kx_msg));
+ kx_msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX_EPHEMERAL);
+ kx_msg.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_MESH_KX);
+ kx_msg.purpose.size = htonl (ephemeral_purpose_size ());
+ kx_msg.origin_identity = my_full_id;
+ rekey_task = GNUNET_SCHEDULER_add_now (&rekey, NULL);
+
+ tunnels = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
}
void
GMT_shutdown (void)
{
- GNUNET_PEER_change_rc (myid, -1);
+ if (GNUNET_SCHEDULER_NO_TASK != rekey_task)
+ {
+ GNUNET_SCHEDULER_cancel (rekey_task);
+ rekey_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ GNUNET_CONTAINER_multipeermap_iterate (tunnels, &destroy_iterator, NULL);
+ GNUNET_CONTAINER_multipeermap_destroy (tunnels);
}
t = GNUNET_new (struct MeshTunnel3);
t->next_chid = 0;
t->peer = destination;
-// if (GNUNET_OK !=
-// GNUNET_CONTAINER_multihashmap_put (tunnels, tid, t,
-// GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
-// {
-// GNUNET_break (0);
-// tunnel_destroy (t);
-// return NULL;
-// }
-
-// char salt[] = "salt";
-// GNUNET_CRYPTO_kdf (&t->e_key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
-// salt, sizeof (salt),
-// &t->e_key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
-// &my_full_id, sizeof (struct GNUNET_PeerIdentity),
-// GNUNET_PEER_resolve2 (t->peer->id), sizeof (struct GNUNET_PeerIdentity),
-// NULL);
-// GNUNET_CRYPTO_kdf (&t->d_key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
-// salt, sizeof (salt),
-// &t->d_key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
-// GNUNET_PEER_resolve2 (t->peer->id), sizeof (struct GNUNET_PeerIdentity),
-// &my_full_id, sizeof (struct GNUNET_PeerIdentity),
-// NULL);
+ if (GNUNET_OK !=
+ GNUNET_CONTAINER_multipeermap_put (tunnels, GMP_get_id (destination), t,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
+ {
+ GNUNET_break (0);
+ GNUNET_free (t);
+ return NULL;
+ }
return t;
}
-
/**
* Change the tunnel state.
*
"Tunnel %s state is now %s\n",
GMP_2s (t->peer),
GMT_state2s (state));
- t->state = state;
+ if (myid != GMP_get_short_id (t->peer) &&
+ MESH_TUNNEL3_WAITING == t->state && MESH_TUNNEL3_READY == state)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " triggered rekey\n");
+ rekey_tunnel (t, NULL);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Tunnel %s state is now %s\n",
+ GMP_2s (t->peer),
+ GMT_state2s (t->state));
+ }
+ else
+ {
+ t->state = state;
+ }
if (MESH_TUNNEL3_READY == state && 3 <= GMT_count_connections (t))
{
GMP_stop_search (t->peer);
{
struct MeshTChannel *aux;
+ GNUNET_assert (NULL != ch);
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Adding channel %p to tunnel %p\n", ch, t);
+
for (aux = t->channel_head; aux != NULL; aux = aux->next)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " already there %p\n", aux->ch);
if (aux->ch == ch)
return;
+ }
aux = GNUNET_new (struct MeshTChannel);
aux->ch = ch;
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " adding %p to %p\n", aux, t->channel_head);
GNUNET_CONTAINER_DLL_insert_tail (t->channel_head, t->channel_tail, aux);
}
{
struct MeshTChannel *aux;
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Removing channel %p from tunnel %p\n", ch, t);
for (aux = t->channel_head; aux != NULL; aux = aux->next)
+ {
if (aux->ch == ch)
{
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " found! %s\n", GMCH_2s (ch));
GNUNET_CONTAINER_DLL_remove (t->channel_head, t->channel_tail, aux);
GNUNET_free (aux);
return;
}
+ }
}
{
struct MeshTConnection *iter;
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel empty: destroying scheduled\n");
for (iter = t->connection_head; NULL != iter; iter = iter->next)
{
GMC_send_destroy (iter->c);
}
- if (0 == t->pending_messages)
- GMT_destroy (t);
- else
- t->destroy = GNUNET_YES;
+ t->destroy = GNUNET_YES;
}
void
GMT_destroy (struct MeshTunnel3 *t)
{
- struct MeshTConnection *iter;
- struct MeshTConnection *next;
+ struct MeshTConnection *iter_c;
+ struct MeshTConnection *next_c;
+ struct MeshTChannel *iter_ch;
+ struct MeshTChannel *next_ch;
if (NULL == t)
return;
LOG (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s\n", GMP_2s (t->peer));
-// if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &t->id, t))
-// GNUNET_break (0);
+ GNUNET_break (GNUNET_YES ==
+ GNUNET_CONTAINER_multipeermap_remove (tunnels,
+ GMP_get_id (t->peer), t));
- for (iter = t->connection_head; NULL != iter; iter = next)
+ for (iter_c = t->connection_head; NULL != iter_c; iter_c = next_c)
+ {
+ next_c = iter_c->next;
+ GMC_destroy (iter_c->c);
+ }
+ for (iter_ch = t->channel_head; NULL != iter_ch; iter_ch = next_ch)
{
- next = iter->next;
- GMC_destroy (iter->c);
- GNUNET_free (iter);
+ next_ch = iter_ch->next;
+ GMCH_destroy (iter_ch->ch);
+ /* Should only happen on shutdown, but it's ok. */
}
GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
GMP_set_tunnel (t->peer, NULL);
+ if (GNUNET_SCHEDULER_NO_TASK != t->rekey_task)
+ GNUNET_SCHEDULER_cancel (t->rekey_task);
+
GNUNET_free (t);
}
-/**
- * Notifies a tunnel that a connection has broken that affects at least
- * some of its peers. Sends a notification towards the root of the tree.
- * In case the peer is the owner of the tree, notifies the client that owns
- * the tunnel and tries to reconnect.
- *
- * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
- *
- * @param t Tunnel affected.
- * @param p1 Peer that got disconnected from p2.
- * @param p2 Peer that got disconnected from p1.
- *
- * @return Short ID of the peer disconnected (either p1 or p2).
- * 0 if the tunnel remained unaffected.
- */
-GNUNET_PEER_Id
-GMT_notify_connection_broken (struct MeshTunnel3* t,
- GNUNET_PEER_Id p1, GNUNET_PEER_Id p2)
-{
-// if (myid != p1 && myid != p2) FIXME
-// {
-// return;
-// }
-//
-// if (tree_get_predecessor (t->tree) != 0)
-// {
-// /* We are the peer still connected, notify owner of the disconnection. */
-// struct GNUNET_MESH_PathBroken msg;
-// struct GNUNET_PeerIdentity neighbor;
-//
-// msg.header.size = htons (sizeof (msg));
-// msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN);
-// GNUNET_PEER_resolve (t->id.oid, &msg.oid);
-// msg.tid = htonl (t->id.tid);
-// msg.peer1 = my_full_id;
-// GNUNET_PEER_resolve (pid, &msg.peer2);
-// GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &neighbor);
-// send_prebuilt_message (&msg.header, &neighbor, t);
-// }
- return 0;
-}
-
/**
* @brief Use the given path for the tunnel.
* Update the next and prev hops (and RCs).
}
-/**
- * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
- * Encrypt data with the tunnel key.
- * Make static?
- *
- * @param t Tunnel whose key to use.
- * @param dst Destination for the encrypted data.
- * @param src Source of the plaintext.
- * @param size Size of the plaintext.
- * @param iv Initialization Vector to use.
- * @param fwd Is this a fwd message?
- */
-void
-GMT_encrypt (struct MeshTunnel3 *t,
- void *dst, const void *src,
- size_t size, uint64_t iv, int fwd)
-{
- memcpy (dst, src, size);
-}
-
-
-/**
- * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
- * Decrypt data with the tunnel key.
- * Make static?
- *
- * @param t Tunnel whose key to use.
- * @param dst Destination for the plaintext.
- * @param src Source of the encrypted data.
- * @param size Size of the encrypted data.
- * @param iv Initialization Vector to use.
- * @param fwd Is this a fwd message?
- */
-void
-GMT_decrypt (struct MeshTunnel3 *t,
- void *dst, const void *src,
- size_t size, uint64_t iv, int fwd)
-{
- memcpy (dst, src, size);
-}
-
-
/**
* Count established (ready) connections of a tunnel.
*
for (count = 0, iter = t->channel_head;
NULL != iter;
- iter = iter->next, count++);
+ iter = iter->next, count++) /* skip */;
return count;
}
GMT_get_state (struct MeshTunnel3 *t)
{
if (NULL == t)
+ {
+ GNUNET_break (0);
return (enum MeshTunnel3State) -1;
+ }
return t->state;
}
+
/**
- * Get the total buffer space for a tunnel.
+ * Get the maximum buffer space for a tunnel towards a local client.
*
* @param t Tunnel.
- * @param fwd Is this for FWD traffic?
*
- * @return Buffer space offered by all connections in the tunnel.
+ * @return Biggest buffer space offered by any channel in the tunnel.
*/
unsigned int
-GMT_get_buffer (struct MeshTunnel3 *t, int fwd)
+GMT_get_channels_buffer (struct MeshTunnel3 *t)
{
- struct MeshTConnection *iter;
+ struct MeshTChannel *iter;
unsigned int buffer;
+ unsigned int ch_buf;
- iter = t->connection_head;
- buffer = 0;
+ if (NULL == t->channel_head)
+ {
+ /* Probably getting buffer for a channel create/handshake. */
+ return 64;
+ }
- /* If terminal, return biggest channel buffer */
- if (NULL == iter || GMC_is_terminal (iter->c, fwd))
+ buffer = 0;
+ for (iter = t->channel_head; NULL != iter; iter = iter->next)
{
- struct MeshTChannel *iter_ch;
- unsigned int ch_buf;
+ ch_buf = get_channel_buffer (iter);
+ if (ch_buf > buffer)
+ buffer = ch_buf;
+ }
+ return buffer;
+}
- if (NULL == t->channel_head)
- return 64;
- for (iter_ch = t->channel_head; NULL != iter_ch; iter_ch = iter_ch->next)
- {
- ch_buf = GMCH_get_buffer (iter_ch->ch, fwd);
- if (ch_buf > buffer)
- buffer = ch_buf;
- }
- return buffer;
- }
+/**
+ * Get the total buffer space for a tunnel for P2P traffic.
+ *
+ * @param t Tunnel.
+ *
+ * @return Buffer space offered by all connections in the tunnel.
+ */
+unsigned int
+GMT_get_connections_buffer (struct MeshTunnel3 *t)
+{
+ struct MeshTConnection *iter;
+ unsigned int buffer;
- /* If not terminal, return sum of connection buffers */
+ iter = t->connection_head;
+ buffer = 0;
while (NULL != iter)
{
if (GMC_get_state (iter->c) != MESH_CONNECTION_READY)
continue;
}
- buffer += GMC_get_buffer (iter->c, fwd);
+ buffer += get_connection_buffer (iter);
iter = iter->next;
}
}
+/**
+ * Send ACK on one or more channels due to buffer in connections.
+ *
+ * @param t Channel which has some free buffer space.
+ */
+void
+GMT_unchoke_channels (struct MeshTunnel3 *t)
+{
+ struct MeshTChannel *iter;
+ unsigned int buffer;
+ unsigned int channels = GMT_count_channels (t);
+ unsigned int choked_n;
+ struct MeshChannel *choked[channels];
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT_unchoke_channels on %s\n", GMT_2s (t));
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " head: %p\n", t->channel_head);
+ if (NULL != t->channel_head)
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " head ch: %p\n", t->channel_head->ch);
+
+ /* Get buffer space */
+ buffer = GMT_get_connections_buffer (t);
+ if (0 == buffer)
+ {
+ return;
+ }
+
+ /* Count and remember choked channels */
+ choked_n = 0;
+ for (iter = t->channel_head; NULL != iter; iter = iter->next)
+ {
+ if (GNUNET_NO == get_channel_allowed (iter))
+ {
+ choked[choked_n++] = iter->ch;
+ }
+ }
+
+ /* Unchoke random channels */
+ while (0 < buffer && 0 < choked_n)
+ {
+ unsigned int r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
+ choked_n);
+ GMCH_allow_client (choked[r], GMCH_is_origin (choked[r], GNUNET_YES));
+ choked_n--;
+ buffer--;
+ choked[r] = choked[choked_n];
+ }
+}
+
+
+/**
+ * Send ACK on one or more connections due to buffer space to the client.
+ *
+ * Iterates all connections of the tunnel and sends ACKs appropriately.
+ *
+ * @param t Tunnel.
+ */
+void
+GMT_send_connection_acks (struct MeshTunnel3 *t)
+{
+ struct MeshTConnection *iter;
+ uint32_t allowed;
+ uint32_t to_allow;
+ uint32_t allow_per_connection;
+ unsigned int cs;
+ unsigned int buffer;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Tunnel send connection ACKs on %s\n",
+ GMT_2s (t));
+
+ if (NULL == t)
+ {
+ GNUNET_break (0);
+ return;
+ }
+
+ buffer = GMT_get_channels_buffer (t);
+
+ /* Count connections, how many messages are already allowed */
+ cs = GMT_count_connections (t);
+ for (allowed = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
+ {
+ allowed += get_connection_allowed (iter);
+ }
+
+ /* Make sure there is no overflow */
+ if (allowed > buffer)
+ {
+ return;
+ }
+
+ /* Authorize connections to send more data */
+ to_allow = buffer; /* - allowed; */
+
+ for (iter = t->connection_head; NULL != iter && to_allow > 0; iter = iter->next)
+ {
+ allow_per_connection = to_allow/cs;
+ to_allow -= allow_per_connection;
+ cs--;
+ if (get_connection_allowed (iter) > 64 / 3)
+ {
+ continue;
+ }
+ GMC_allow (iter->c, buffer, GMC_is_origin (iter->c, GNUNET_YES));
+ }
+
+ GNUNET_break (to_allow == 0);
+}
+
+
+/**
+ * Callback called when a queued message is sent.
+ *
+ * Calculates the average time and connection packet tracking.
+ *
+ * @param cls Closure (TunnelQueue handle).
+ * @param c Connection this message was on.
+ * @param type Type of message sent.
+ * @param fwd Was this a FWD going message?
+ * @param size Size of the message.
+ */
+static void
+message_sent (void *cls,
+ struct MeshConnection *c,
+ struct MeshConnectionQueue *q,
+ uint16_t type, int fwd, size_t size)
+{
+ struct MeshTunnel3Queue *qt = cls;
+
+ GNUNET_assert (NULL != qt->cont);
+ qt->cont (qt->cont_cls, GMC_get_tunnel (c), qt, type, size);
+ GNUNET_free (qt);
+}
+
+
+/**
+ * Cancel a previously sent message while it's in the queue.
+ *
+ * ONLY can be called before the continuation given to the send function
+ * is called. Once the continuation is called, the message is no longer in the
+ * queue.
+ *
+ * @param q Handle to the queue.
+ */
+void
+GMT_cancel (struct MeshTunnel3Queue *q)
+{
+ GMC_cancel (q->q);
+ /* message_sent() will be called and free q */
+}
+
/**
* Sends an already built message on a tunnel, encrypting it and
* choosing the best connection.
* @param message Message to send. Function modifies it.
* @param t Tunnel on which this message is transmitted.
* @param ch Channel on which this message is transmitted.
- * @param fwd Is this a fwd message?
+ * @param fwd Is this a fwd message on @c ch?
+ * @param cont Continuation to call once message is really sent.
+ * @param cont_cls Closure for @c cont.
+ *
+ * @return Handle to cancel message. NULL if @c cont is NULL.
*/
-void
+struct MeshTunnel3Queue *
GMT_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
struct MeshTunnel3 *t,
- struct MeshChannel *ch,
- int fwd)
+ struct MeshChannel *ch, int fwd,
+ GMT_sent cont, void *cont_cls)
{
+ struct MeshTunnel3Queue *q;
struct MeshConnection *c;
struct GNUNET_MESH_Encrypted *msg;
size_t size = ntohs (message->size);
- char *cbuf[sizeof (struct GNUNET_MESH_Encrypted) + size];
- uint64_t iv;
+ size_t encrypted_size;
+ char cbuf[sizeof (struct GNUNET_MESH_Encrypted) + size];
+ uint32_t iv;
uint16_t type;
- LOG (GNUNET_ERROR_TYPE_DEBUG, "Send on Tunnel %s\n", GMP_2s (t->peer));
+ if (MESH_TUNNEL3_READY != t->state)
+ {
+ queue_data (t, ch, message);
+ /* FIXME */
+ return NULL;
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT Send on Tunnel %s\n", GMT_2s (t));
+
+ if (GMT_is_loopback (t))
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG, " loopback!\n");
+ handle_decrypted (t, message, fwd);
+ /* FIXME: call cont? */
+ return NULL; /* Already delivered, cannot cancel */
+ }
- iv = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_NONCE, UINT64_MAX);
+ iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
msg = (struct GNUNET_MESH_Encrypted *) cbuf;
msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED);
- msg->header.size = htons (sizeof (struct GNUNET_MESH_Encrypted) + size);
- msg->iv = GNUNET_htonll (iv);
- GMT_encrypt (t, &msg[1], message, size, iv, fwd);
- c = tunnel_get_connection (t, fwd);
+ msg->iv = iv;
+ encrypted_size = t_encrypt (t, &msg[1], message, size, iv);
+ msg->header.size = htons (sizeof (struct GNUNET_MESH_Encrypted) + encrypted_size);
+ c = tunnel_get_connection (t);
if (NULL == c)
{
GNUNET_break (GNUNET_YES == t->destroy);
- return;
+ return NULL;
}
type = ntohs (message->type);
switch (type)
{
- case GNUNET_MESSAGE_TYPE_MESH_FWD:
- case GNUNET_MESSAGE_TYPE_MESH_BCK:
+ case GNUNET_MESSAGE_TYPE_MESH_DATA:
+ case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
+ case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
msg->cid = *GMC_get_id (c);
msg->ttl = htonl (default_ttl);
break;
GNUNET_MESH_DEBUG_M2S (type));
GNUNET_break (0);
}
- msg->reserved = 0;
- t->pending_messages++;
- GMC_send_prebuilt_message (&msg->header, c, ch, fwd);
+ fwd = GMC_is_origin (c, GNUNET_YES);
+
+ if (NULL == cont)
+ {
+ (void) GMC_send_prebuilt_message (&msg->header, c, fwd, NULL, NULL);
+ return NULL;
+ }
+ q = GNUNET_new (struct MeshTunnel3Queue); /* FIXME valgrind: leak*/
+ q->q = GMC_send_prebuilt_message (&msg->header, c, fwd, &message_sent, q);
+ q->cont = cont;
+ q->cont_cls = cont_cls;
+
+ return q;
}
/**
*
* @param t Tunnel.
*
- * @return GNUNET_YES if it is loopback.
+ * @return #GNUNET_YES if it is loopback.
*/
int
GMT_is_loopback (const struct MeshTunnel3 *t)
{
- return (myid == GMP_get_short_id(t->peer));
+ return (myid == GMP_get_short_id (t->peer));
}
/**
- * Is the tunnel using this path already?
+ * Is the tunnel this path already?
*
* @param t Tunnel.
* @param p Path.
*
- * @return GNUNET_YES a connection uses this path.
+ * @return #GNUNET_YES a connection uses this path.
*/
int
GMT_is_path_used (const struct MeshTunnel3 *t, const struct MeshPeerPath *p)
{
- struct MeshTConnection *c;
+ struct MeshTConnection *iter;
- for (c = t->connection_head; NULL != c; c = c->next)
- if (GMC_get_path (c) == p)
+ for (iter = t->connection_head; NULL != iter; iter = iter->next)
+ if (GMC_get_path (iter->c) == p)
return GNUNET_YES;
return GNUNET_NO;
const char *
GMT_2s (const struct MeshTunnel3 *t)
{
+ if (NULL == t)
+ return "(NULL)";
+
return GMP_2s (t->peer);
-}
\ No newline at end of file
+}
projects / oweals / gnunet.git / blobdiff