net: lorawan: Add LoRaWAN soft MAC module

LoRaWAN(TM) is the MAC layer defined by LoRa Alliance(TM) over LoRa devices. LoRa is one of Low-Power Wide-Area Network (LPWAN) technology.

LoRaWAN networks typically are laid out in a star-of-stars topology in which gateways relay messages between end-devices and a central network server at the backend. Gateways are connected to the network server via standard IP connections while end-devices use single hop LoRa(TM) or FSK communication to one or many gateways.

A LoRa network distinguishes between a basic LoRaWAN (named Class A) and optional features (Class B, Class C ...):
* Bi-directional end-devices (Class A)
* Bi-directional end-devices with scheduled receive slots (Class B)
* Bi-directional end-devices with maximal receive slots (Class C)

This patch set add LoRaWAN class module implementing the stack, especially the soft MAC, between socket APIs and LoRa device drivers.

socket APIs:
send and receive the data
------------------------------------------------------------------------
LoRaWAN class module implements soft MAC:
append the header/footer, encryption/decryption, timing slot and MAC commands
------------------------------------------------------------------------
LoRa device drivers:
send and receive the messages for MAC layer
------------------------------------------------------------------------
LoRa devices

This module starts from simple and implements partial Class A end-devices features defined in LoRaWAN(TM) Specification Ver. 1.0.2. More features and complexity, for example regional parameters, confirmed data messages, join request/accept messages for Over-The-Air Activation, MAC commands ... will be added in the future.

Jian-Hong Pan (6):
net: lorawan: Add LoRaWAN socket module
net: lorawan: Add LoRaWAN API declaration for LoRa devices
net: maclorawan: Add maclorawan module declaration
net: maclorawan: Implement the crypto of maclorawan module
net: maclorawan: Implement maclorawan class module
net: lorawan: List LORAWAN in menuconfig

 include/linux/lora/lorawan.h        | 131 ++++++
 include/linux/lora/lorawan_netdev.h |  52 +++
 net/Kconfig                         |   2 +
 net/Makefile                        |   2 +
 net/lorawan/Kconfig                 |  10 +
 net/lorawan/Makefile                |   2 +
 net/lorawan/socket.c                | 686 ++++++++++++++++++++++++++++
 net/maclorawan/Kconfig              |  14 +
 net/maclorawan/Makefile             |   2 +
 net/maclorawan/crypto.c             | 212 +++++++++
 net/maclorawan/crypto.h             |  27 ++
 net/maclorawan/mac.c                | 555 ++++++++++++++++++++++
 net/maclorawan/maclorawan.h         | 202 ++++++++
 net/maclorawan/main.c               | 606 ++++++++++++++++++++++++
 14 files changed, 2503 insertions(+)
 create mode 100644 include/linux/lora/lorawan.h
 create mode 100644 include/linux/lora/lorawan_netdev.h
 create mode 100644 net/lorawan/Kconfig
 create mode 100644 net/lorawan/Makefile
 create mode 100644 net/lorawan/socket.c
 create mode 100644 net/maclorawan/Kconfig
 create mode 100644 net/maclorawan/Makefile
 create mode 100644 net/maclorawan/crypto.c
 create mode 100644 net/maclorawan/crypto.h
 create mode 100644 net/maclorawan/mac.c
 create mode 100644 net/maclorawan/maclorawan.h
 create mode 100644 net/maclorawan/main.c

2.20.0