* Reworked the complete stack to allow more than one address per network

interface - this caused quite a number of changes.
* Network interfaces, and its addresses are now reference counted (not yet
  complete, though, InterfaceAddresses need to hold references to their
  interface as well).
* There are two known regressions of this commit that I will fix later:
  - you cannot remove interfaces anymore
  - IPv4 multicast was broken anyway, but now it's disabled, too.
* Moved a device_interfaces.cpp|h out of interfaces.cpp.
* The datalink layer chain is now instantiated per domain per interface,
  not just per interface anymore.
* When a buffer reaches the network layer, it has no known interface yet, ie.
  the ipv4|6|whatever modules need to set this manually.
* Added more debug output, and some new debugger commands, the control option
  is now printed in clear text.
* Added hash_address() function to the address modules. Added "const" to
  set_to_defaults() where needed.
* Fixed net_buffer's restore header functions offset use as reported by Atis.
* Improved buffer dump output, use the domain module to print the address if
  available.
* Moved net_buffer::type into the union, as it's not needed by the upper layers
  anymore.
* Moved IPv6 specific code from {add|remove}_default_route() to where it
  belongs, but disabled it for the time being.
* Completely discarded useless ipv4_datagram module.
* Added ping6 to the build.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37794 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/net/net_buffer.h

@@ -18,14 +18,9 @@
 typedef struct net_buffer {
 	struct list_link		link;
 
-	// TODO: we should think about moving the address fields into the buffer
-	// data itself via associated data or something like this. Or this
-	// structure as a whole, too...
-
 	struct sockaddr*		source;
 	struct sockaddr*		destination;
-	struct net_interface*	interface;
-	int32					type;
+	struct net_interface_address*	interface_address;
 	union {
 		struct {
 			uint16			start;
@@ -33,6 +28,7 @@ typedef struct net_buffer {
 		}					fragment;
 		uint32				sequence;
 		uint32				offset;
+		int32				type;
 	};
 	uint32					flags;
 	uint32					size;