Added support for attaching ancillary data to a net_buffer. It's a naive

implementation ATM, since it malloc()s the required memory.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24940 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/net/net_buffer.h

@@ -37,6 +37,12 @@ typedef struct net_buffer {
 	uint8	protocol;
 } net_buffer;
 
+typedef struct ancillary_data_header {
+	int		level;
+	int		type;
+	size_t	len;
+} ancillary_data_header;
+
 struct net_buffer_module_info {
 	module_info info;
 
@@ -68,6 +74,17 @@ struct net_buffer_module_info {
 
 	status_t		(*associate_data)(net_buffer *buffer, void *data);
 
+	status_t		(*attach_ancillary_data)(net_buffer *buffer,
+						const ancillary_data_header *header, const void *data,
+						void (*destructor)(const ancillary_data_header*, void*),
+						void **_allocatedData);
+	status_t		(*detach_ancillary_data)(net_buffer *buffer, void *data,
+						bool destroy);
+	void *			(*transfer_ancillary_data)(net_buffer *from,
+						net_buffer *to);
+	void *			(*next_ancillary_data)(net_buffer *buffer,
+						void *previousData, ancillary_data_header *_header);
+
 	status_t		(*direct_access)(net_buffer *buffer, uint32 offset,
 						size_t bytes, void **_data);
 	status_t 		(*read)(net_buffer *buffer, uint32 offset, void *data,