X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;f=doc%2FNETWORKING;fp=doc%2FNETWORKING;h=0000000000000000000000000000000000000000;hb=22f930e7c6352a1b43b1605799925e10fced254a;hp=eb4f6bc61a3384331aeb3458c1f252db634815be;hpb=82bbb6f1947bfb98a52422d7202aef331d36b1d7;p=meshlink

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-This is the network infrastructure documentation for tinc, a Virtual Private
-Network daemon.
-
-   Copyright 2001-2006 Guus Sliepen <guus@meshlink.io>
-
-   Permission is granted to make and distribute verbatim copies of
-   this documentation provided the copyright notice and this
-   permission notice are preserved on all copies.
-
-   Permission is granted to copy and distribute modified versions of
-   this documentation under the conditions for verbatim copying,
-   provided that the entire resulting derived work is distributed
-   under the terms of a permission notice identical to this one.
-
-1. Packet flow
-==============
-
-There are two directions for packets. There are packets received from the tap
-device that have to be sent out to other tinc daemon, and there are packets
-that are received from other tinc daemons which have to be send to the tap
-device. The first direction will be called the outgoing direction, while the
-latter will be called the incoming direction.
-
-1.1 Outgoing flow
------------------
-
-        handle_tap_input()
-                |
-                |
-                V
-         route_outgoing()
-                |
-                |
-                V
-          send_packet()         ----
-          /           \        /    \
-         /             \      |   queue
-        V               V     V     /
-send_tcppacket()  send_udppacket()--
-
-Packets are read from the tap device by handle_tap_input(). The packets will be
-marked as coming from ourself, and are then handled by route_outgoing(). This
-function will determine the destination tinc daemon this packet has to be sent
-to, and in the future it may also determine if this packet has to be broadcast
-or multicast. route_outgoing() will call send_packet() (in case of
-broad/multicast several times). send_packet() will check the destination
-connection_t entry to see if it is a valid destination, and whether it has to
-be sent via TCP or UDP. It will then either call send_tcppacket() or
-send_udppacket(). Since a different key is used for UDP packets, which might
-not be available at that time, send_udppacket() might put the packet in a queue
-and send a REQ_KEY to the destination tinc daemon. If the key has been retrieved,
-the packet will be fed to send_udppacket() again.
-
-1.2 Incoming flow
------------------
-
-               handle_vpn_input()
-                        |
-                        |
-                        V
-tcppacket_h()  receive_udppacket()
-        \              /
-         \            /
-          V          V
-        receive_packet()
-               |
-               |
-               V
-        route_incoming()
-               |
-               |
-               V
-        accept_packet()
-
-Packets from other tinc daemons can be received by tcppacket_h(), for TCP
-packets, and receive_udppacket() via handle_vpn_input() for UDP packets.
-receive_packet() actually does not have to do much, except logging and calling
-route_incoming(), but it's there for symmetry with the scheme for the outgoing
-flow. route_incoming() will change the MAC header of the packet if necessary to
-let the kernel accept the packet after it has been sent to the tap device by
-accept_packet().