doc/ipconfig-api.txt

   1 IP configuration handling
   2 *************************
   3
   4
   5 IP basics
   6 =========
   7
   8 The core IP handling is designed around network interfaces or more precisely
   9 what the Linux kernel handles as struct net_device. Via RTNL every interface
  10 is tracked and an IP device created for it.
  11
  12         +--------+           +---- eth0 -----+
  13         |        |           |               |
  14         |  RTNL  +-----+---->|   IP device   |
  15         |        |     |     |               |
  16         +--------+     |     +---------------+
  17                        |
  18                        |     +---- wlan0 ----+
  19                        |     |               |
  20                        +---->|   IP device   |
  21                              |               |
  22                              +---------------+
  23
  24 The IP device tracks link configuration, IP address setting and routing
  25 information for that interface. Every IP device also contains a configuration
  26 element. That element contains an operation table for callbacks based on
  27 different events.
  28
  29         struct connman_ipconfig_ops {
  30                 void (*up)         (struct connman_ipconfig *);
  31                 void (*down)       (struct connman_ipconfig *);
  32                 void (*lower_up)   (struct connman_ipconfig *);
  33                 void (*lower_down) (struct connman_ipconfig *);
  34                 void (*ip_bound)   (struct connman_ipconfig *);
  35                 void (*ip_release) (struct connman_ipconfig *);
  36         };
  37
  38 All configuration objects created directly by RTNL are tightly bound to the
  39 IP device. They will trigger DHCP or other configuration helpers.
  40
  41