doc/dialup-overview.txt

   1 DialUp Networking diagram
   2 =========================
   3
   4 This diagram explains how oFono and ConnMan are interacting to handle a data
   5 call from a DUN client.
   6
   7 1) GAtServer receive ATD*99#.
   8 2) The GAtPPP server is setup.
   9 3) oFono through GAtPPP notify ConnMan that he needs a TUN/TAP interface.
  10 4) oFono is notified that TUN/TAP interface is created and can start exchanging
  11    PPP packets with DUN client. Those PPP packets are converted into IP stream
  12    and transmitted to/received from TUN/TAP interface.
  13 5) ConnMan is selecting which interface to send IP packets (WiFi, 3G, ...).
  14
  15
  16 *----------------*            *----------------*
  17 |                |  ATD*99#   |                |
  18 |   DUN Client   |----------->|    GAtServer   |
  19 |                |<---*       |                |
  20 *----------------*    |       *----------------*
  21                       |             |
  22               PPP     |             | setup_ppp()
  23               Packets |             |
  24                       |             |
  25                       |             V           Need
  26                       |    *----------------*   /dev/net/tun *----------------*
  27                       *--->|                |   interface    |                |
  28                            |     GAtPPP     |<-------------->|     ConnMan    |
  29                       *--->|                |   interface    |                |
  30                       |    *----------------*   created      *----------------*
  31               IP      |                                          |
  32               Stream  |                                          |Create
  33                       |    *------------------------*            |/dev/net/tun
  34                       |    |                        |            |interface
  35                       *--->|    TUN/TAP interface   |<-----------*
  36                            |                        |
  37                            *------------------------*
  38                                       IP | Stream
  39                              routed with | ConnMan rules
  40                    *---------------------*--------------------*
  41                    |                     |                    |
  42                    |                     |                    |
  43                    V                     V                    V
  44             *-------------*       *-------------*      *-------------*
  45             |             |       |             |      |             |
  46             |  WiFi       |       |   Modem     |      |    EthX     |
  47             |             |       |             |      |             |
  48             *-------------*       *-------------*      *-------------*