1 files changed, 313 insertions, 0 deletions
diff --git a/src/exit/exit.h b/src/exit/exit.h
new file mode 100644
index 0000000..dcc50f1
--- /dev/null
+++ b/src/exit/exit.h
@@ -0,0 +1,313 @@
+/*
+     This file is part of GNUnet.
+     (C) 2012 Christian Grothoff
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 3, or (at your
+     option) any later version.
+
+     GNUnet is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file exit/exit.h
+ * @brief format for mesh messages exchanged between VPN service and exit daemon
+ * @author Christian Grothoff
+ */
+#ifndef EXIT_H
+#define EXIT_H
+
+#include "gnunet_util_lib.h"
+
+GNUNET_NETWORK_STRUCT_BEGIN
+
+/**
+ * Message send via mesh to an exit daemon to initiate forwarding of
+ * TCP data to a local service.
+ */
+struct GNUNET_EXIT_TcpServiceStartMessage
+{
+  /**
+   * Type is GNUNET_MESSAGE_TYPE_VPN_TCP_TO_SERVICE_START
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Always 0.
+   */
+  uint32_t reserved GNUNET_PACKED;
+
+  /**
+   * Identification for the desired service.
+   */
+  GNUNET_HashCode service_descriptor GNUNET_PACKED;
+
+  /**
+   * Skeleton of the TCP header to send.  Port numbers are to
+   * be replaced and the checksum may be updated as necessary.
+   */
+  struct GNUNET_TUN_TcpHeader tcp_header;
+
+  /* followed by TCP payload */
+};
+
+
+/**
+ * Message send via mesh to an exit daemon to initiate forwarding of
+ * TCP data to the Internet.
+ */
+struct GNUNET_EXIT_TcpInternetStartMessage
+{
+  /**
+   * Type is GNUNET_MESSAGE_TYPE_VPN_TCP_TO_INTERNET_START
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Address family, AF_INET or AF_INET6, in network byte order.
+   */
+  int32_t af GNUNET_PACKED;
+
+  /**
+   * Skeleton of the TCP header to send.  Port numbers are to
+   * be replaced and the checksum may be updated as necessary.
+   */
+  struct GNUNET_TUN_TcpHeader tcp_header;
+
+  /* followed by IP address of the destination; either
+     'struct in_addr' or 'struct in6_addr', depending on af */
+
+  /* followed by TCP payload */
+};
+
+
+/**
+ * Message send via mesh between VPN and entry and an exit daemon to 
+ * transmit TCP data between the VPN entry and an exit session.  This
+ * format is used for both Internet-exits and service-exits and
+ * in both directions (VPN to exit and exit to VPN).
+ */
+struct GNUNET_EXIT_TcpDataMessage
+{
+  /**
+   * Type is GNUNET_MESSAGE_TYPE_VPN_TCP_DATA
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Always 0.
+   */
+  uint32_t reserved GNUNET_PACKED;
+
+  /**
+   * Skeleton of the TCP header to send.  Port numbers are to
+   * be replaced and the checksum may be updated as necessary.  (The destination port number should not be changed, as it contains the desired destination port.)
+   */
+  struct GNUNET_TUN_TcpHeader tcp_header;
+
+  /* followed by TCP payload */
+};
+
+
+/**
+ * Message send via mesh to an exit daemon to send
+ * UDP data to a local service.
+ */
+struct GNUNET_EXIT_UdpServiceMessage
+{
+  /**
+   * Type is GNUNET_MESSAGE_TYPE_VPN_UDP_TO_SERVICE
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Source port to use for the UDP request (0 to use a random port).  In NBO.
+   */
+  uint16_t source_port GNUNET_PACKED;
+
+  /**
+   * Destination port to use for the UDP request.  In NBO.
+   */   
+  uint16_t destination_port GNUNET_PACKED;
+
+  /**
+   * Identification for the desired service.
+   */
+  GNUNET_HashCode service_descriptor GNUNET_PACKED;
+
+  /* followed by UDP payload */
+};
+
+
+/**
+ * Message send via mesh to an exit daemon to forward
+ * UDP data to the Internet.
+ */
+struct GNUNET_EXIT_UdpInternetMessage
+{
+  /**
+   * Type is GNUNET_MESSAGE_TYPE_VPN_UDP_TO_INTERNET
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Address family, AF_INET or AF_INET6, in network byte order.
+   */
+  int32_t af GNUNET_PACKED;
+
+  /**
+   * Source port to use for the UDP request (0 to use a random port).  In NBO.
+   */
+  uint16_t source_port GNUNET_PACKED;
+
+  /**
+   * Destination port to use for the UDP request.  In NBO.
+   */   
+  uint16_t destination_port GNUNET_PACKED;
+
+  /* followed by IP address of the destination; either
+     'struct in_addr' or 'struct in6_addr', depending on af */
+
+  /* followed by UDP payload */
+};
+
+
+/**
+ * Message send from exit daemon back to the UDP entry point
+ * (used for both Internet and Service exit replies).
+ */
+struct GNUNET_EXIT_UdpReplyMessage
+{
+  /**
+   * Type is GNUNET_MESSAGE_TYPE_VPN_UDP_REPLY
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Source port to use for the UDP reply (0 to use the same
+   * port as for the original request).  In NBO.
+   */
+  uint16_t source_port GNUNET_PACKED;
+
+  /**
+   * Destination port to use for the UDP reply (0 to use the same
+   * port as for the original request).  In NBO.
+   */   
+  uint16_t destination_port GNUNET_PACKED;
+
+  /* followed by UDP payload */
+};
+
+
+/**
+ * Message send via mesh to an exit daemon to send
+ * ICMP data to a local service.
+ */
+struct GNUNET_EXIT_IcmpServiceMessage
+{
+  /**
+   * Type is GNUNET_MESSAGE_TYPE_VPN_ICMP_TO_SERVICE
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Address family, AF_INET or AF_INET6, in network byte order.  This
+   * AF value determines if the 'icmp_header' is ICMPv4 or ICMPv6.
+   * The receiver (exit) may still have to translate (PT) to the services'
+   * ICMP version (if possible).
+   */
+  int32_t af GNUNET_PACKED;
+
+  /**
+   * Identification for the desired service.
+   */
+  GNUNET_HashCode service_descriptor GNUNET_PACKED;
+
+  /**
+   * ICMP header to use.
+   */
+  struct GNUNET_TUN_IcmpHeader icmp_header;
+
+  /* followed by ICMP payload; however, for certain ICMP message
+     types where the payload is the original IP packet, the payload
+     is omitted as it is useless for the receiver (who will need
+     to create some fake payload manually)  */
+};
+
+
+/**
+ * Message send via mesh to an exit daemon to forward
+ * ICMP data to the Internet.
+ */
+struct GNUNET_EXIT_IcmpInternetMessage
+{
+  /**
+   * Type is GNUNET_MESSAGE_TYPE_VPN_ICMP_TO_INTERNET
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Address family, AF_INET or AF_INET6, in network byte order.
+   * Determines both the ICMP version used in the 'icmp_header' and
+   * the IP address format that is used for the target IP.  If
+   * PT is necessary, the sender has already done it.
+   */
+  int32_t af GNUNET_PACKED;
+
+  /**
+   * ICMP header to use.  Must match the target 'af' given
+   * above.
+   */
+  struct GNUNET_TUN_IcmpHeader icmp_header;
+
+  /* followed by IP address of the destination; either
+     'struct in_addr' or 'struct in6_addr', depending on af */
+
+  /* followed by ICMP payload; however, for certain ICMP message
+     types where the payload is the original IP packet, the payload
+     is omitted as it is useless for the receiver (who will need
+     to create some fake payload manually)   */
+};
+
+
+/**
+ * Message send via mesh to the vpn service to send
+ * ICMP data to the VPN's TUN interface.
+ */
+struct GNUNET_EXIT_IcmpToVPNMessage
+{
+  /**
+   * Type is GNUNET_MESSAGE_TYPE_VPN_ICMP_TO_VPN
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Address family, AF_INET or AF_INET6, in network byte order.
+   * Useful to determine if this is an ICMPv4 or ICMPv6 header.
+   */
+  int32_t af GNUNET_PACKED;
+
+  /**
+   * ICMP header to use.  ICMPv4 or ICMPv6, depending on 'af'.
+   */
+  struct GNUNET_TUN_IcmpHeader icmp_header;
+
+  /* followed by ICMP payload; however, for certain ICMP message
+     types where the payload is the original IP packet, the payload
+     is omitted as it is useless for the receiver (who will need
+     to create some fake payload manually) */
+};
+
+
+GNUNET_NETWORK_STRUCT_END
+
+#endif