.-------------------------------------------------------------------------------------------------------.
              |                                               Userspace                                               |
              '-----------------^----------------------------------^----------------------------------^---------------'
                                |                                  | socket                           |
                                |                                  v                                  |
                                |                  .------------------------------.                   |
                                | socket           |             IPv6             |                   |
                                |                  '------------------------------'                   | netlink
                                |                                         ^                           |
             .------------------|-----------------------------------------|---------------------------|-----------------.
             |                  |                             ieee802154  |                           |                 |
             |------------------|-----------------------------------------|---------------------------|-----------------|
             |                  v                                         v                           |                 |
             | .---------------------------------. .-----------------------------.                    |                 |
             | |        802.15.4 Sockets         | |      802.15.4 6LoWPAN       |                    |                 |
             | |---------------------------------| |-----------------------------|    .---------------v-------------.   |
             | |.--------------. .--------------.| |                             |    |          nl802154           |   |
             | ||    DGRAM     | |     RAW      || |  .-----------------------.  |    |-----------------------------|   |
             | || data payload | |  full frame  || |  |    Generic 6LoWPAN    |  |    |                             |   |
             | |'------^-------' '--------------'| |  | .-------------------. |  |    |  .----------. .-----------. |   |
             | |       |                | ^      | |  | |        NHC        | |  |    |  |   mlme   | | cmd, etc. | |   |
             | |       |                | |      | |  | '-------------------' |  |    |  |----------| |-----------| |   |
             | |       v                | |      | |  '-------------^---------'  |    |  | assoc.   | | panid     | |   |
             | | .------------.         | |      | |                |            |    |  | deassoc. | | channel   | |   |
             | | | dataframes |       tx| | rx   | |       .--------v--------.   |    |  | ...      | | ...       | |   |
             | | '------------'         | |      | |       |   dataframes    |   |    |  '----------' '-----------' |   |
             | |     |    ^             | |      | |       '-------^-|-------'   |    |       |             ^       |   |
             | '-----|----|-------------|-|------' '---------------|-|-----------'    |       |             |       |   |
             |       |    |             | |-----------.            | |                |       |             |       |   |
             |    tx |    |rx           '-------|     |            | |                '-------|-------------|-------'   |
             |       |    |---------------------|-----|------.   rx| |tx                      |             |           |
             |       v                          |     |      |     | |                        |             |           |
             | .------------------------------. |     |      |     | |                        |             |           |
             | |        frame creation        | |     |      |     | |                        |             |           |
             | |------------------------------| |     |      |     | |                        |             |           |
             | | generic functions            <-|-----|--------------'                        |             |           |
             | | - wpan_dev callbacks struct? | |     |      |     |                          |             |           |
             | |   instead dev_hard_header    | |     |      |     |   .-------------------.  |             |           |
         ******|   different HardMAC/SoftMAC  | |     |      |     |   |  mlme operations  |  |             |           |
         *   | | - data                       | |     |      |     |   |                   |<-'             |           |
         *   | | --- for mlme ---             | |     |      |     |   '-------------------'                |           |
         *   | | - beacon                     | |     |      |     |                |                       |           |
         *   | | - cmd                        | |     |      |     |                |                       |           |
         *   | | - ack? -> (slotted mode)     | |     |      |     |                |                       |           |
         *   | '--------------|---------------' |.-------------------------.        |                       |           |
         *   |                v                 ||  802.15.4 packet_layer  |        |             ----------'           |
         *   |       .----------------.         |'-------------------------'        |             |                     |
         *   |       | dev_queue_xmit |<--------'            ^                      |             |                     |
         *   |       '----------------'                      |                      |             |                     |
         *   '----------------|------------------------------|----------------------|-------------|---------------------'
         *              .-----|------------------------------|----------------------|-------------|------------.
         *              |     |                              | mac802154            |             |            |
         *              |-----|------------------------------|----------------------v-------------v------------|
         *              |     |                              |               .-------------..-----------.      |
         *******************************************************************>| do mlme ops || cfg802154 |      |
can use frame creation  |     |   .--------------------------|-------------. '-------------'|-----------|      |
                        |     |   | Frame parsing (call netif_receive_skb) |        |       | panid     |--------|
                        |     |   |----------------------------------------|        |       | shortaddr |      | |
                        |     |   | again check if 802.15.4 compliant      |        |       | etc.      |      | |
                        |     |   | different handling coordinator/node    |        |       '-----------'      | |
                        |     |   | set packet type (e.g. PACKET_HOST)     |        |                          | |
                        |     |   '---------------------^------------------'        |                          | |
                        |     |                         |                           | tx workqueue             | |
                        |     |ndo_start_xmit           |   |-----------------------'                          | |  .--------------.
                        |     |      .------------------|---|--------------------------------------.           | |  | e.g. tcpdump |
                        |     |      |                  |   |interface types                       |           | |  '--------------'
                        |     |      |------------------|---|--------------------------------------|           | |          ^
                        |     |      |                  |   |                                      |           | |          |
                        |     |      | .----------------|---v-----------.  .---------------------. |           | |          |
                        |     |      | |             frames             |  |       frames        | | mac sett. | |    .-----------.
                        |     '-------->    for rx, filtered by phy     |  | non-filtered by phy | |<------------|    | af_packet |
                        |            | |--------------------------------|  |---------------------| |           | |    '-----------'
                        |        .---| |                                |  |                     |----.        | |          ^
                        |        |   | | .-------------.  .-----------. |  | .-----------.       | |  |        | |          |
                        |        |   | | | coordinator |  |   node    | |  | |  monitor  |-----------------------|----------'
                        |        |   | | '------^------'  '-----^-----' |  | '-----------'       | |  |        | |
                        |        |   | '--------|---------------|-------'  '-------^-------------' |  |        | |
                        |        |   '----------|---------------|------------------|---------------'  |        | |
                        |        |              | rx/tx         | rx/tx            |rx/tx not possible(no AACK)| |
                        |        |              |               |         |--------|                  |        | |
                        '--------|--------------|---------------|---------|--------|------------------|--------' |
                                 |              v               v         |        |                  |          |
                                 |         ===================================     |                  |          |
                                 |               ^          ^          ^           |                  |          |
                                 |        .------|----------|----------|-----------|------.           |          |
    each interface type has      |        |      |          |  Frames  |           |      |           |     if AACK, ack frames are handled   
    different phy address filters|        |------|----------|----------|-----------|------|           |     by phy layer, not driver.         
    - sets mac settings on ifup  |        | .----v----..----v----..----v----. .---------. |  AACK ----|--->                                   
                                 |        | |  data   ||   cmd   || beacon  | |   ack   |------.      |     AACK disabled if promiscuous mode.
                                 |        | '----^----''----^----''----^----' '----^----' |    |      |     Then driver receives ack frames.  
                                 |        '------|----------|----------|-----------.------'    |      |          |
                                 |               |          |          |           .           |      |          |
                                 |               |          |          |           .           |      | sets promiscuous mode
                                 |        .------v----------v----------v-----------v------.    |      |          |
                                 |        |            802.15.4 SoftMAC Driver            |    |      |          |
                                 |        |-----------------------------------------------|    |      |          |
                                 |        | - supports always AACK handling               |    |      |          |
                                 -------->|   - ACK handling is done by phy (AACK)        |<-----------          |
                                          |   - on AACK, ACK frames doesn't reach driver  |<----------------------
                                          | - filtering (CRC, address, what phy can do..) |    |   phy settings
                                          '-----------------------------------------------'    |
                                                                  ^                            |
                                                                  |                            |
                                                                  v                            |
                                                      .----------------------.                 |
                                                      | 802.15.4 SoftMAC PHY |<----------------'
                                                      '----------------------'