src/xt_builder.c

   1 /*
   2  * Lightweight Autonomic Network Architecture
   3  *
   4  * Builds Functional Block objects requested by its type. Holds global
   5  * reference to all registered functional blocks. Invoked from userspace
   6  * via xt_user Netlink.
   7  *
   8  * Copyright 2011 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,
   9  * Swiss federal institute of technology (ETH Zurich)
  10  * Subject to the GPL.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15
  16 #include "xt_critbit.h"
  17 #include "xt_builder.h"
  18 #include "xt_fblock.h"
  19
  20 static struct critbit_tree fbmap;
  21
  22 int register_fblock_type(struct fblock_factory *fops)
  23 {
  24         return critbit_insert(&fbmap, fops->type);
  25 }
  26 EXPORT_SYMBOL_GPL(register_fblock_type);
  27
  28 void unregister_fblock_type(struct fblock_factory *fops)
  29 {
  30         critbit_delete(&fbmap, fops->type);
  31 }
  32 EXPORT_SYMBOL_GPL(unregister_fblock_type);
  33
  34 struct fblock *build_fblock_object(char *type, char *name)
  35 {
  36         struct fblock *fb;
  37         struct fblock_factory *factory = struct_of(critbit_get(&fbmap, type),
  38                                                    struct fblock_factory);
  39         if (!factory) {
  40                 printk(KERN_ERR "[lana] So such type available!\n");
  41                 return NULL;
  42         }
  43         fb = factory->ctor(name);
  44         if (!fb)
  45                 return NULL;
  46         fb->factory = factory;
  47         return fb;
  48 }
  49 EXPORT_SYMBOL(build_fblock_object);
  50
  51 int init_fblock_builder(void)
  52 {
  53         get_critbit_cache();
  54         critbit_init_tree(&fbmap);
  55         return 0;
  56 }
  57 EXPORT_SYMBOL_GPL(init_fblock_builder);
  58
  59 void cleanup_fblock_builder(void)
  60 {
  61         put_critbit_cache();
  62 }
  63 EXPORT_SYMBOL_GPL(cleanup_fblock_builder);
  64