src/xt_vlink.h

   1 /*
   2  * Lightweight Autonomic Network Architecture
   3  *
   4  * Copyright 2011 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,
   5  * Swiss federal institute of technology (ETH Zurich)
   6  * Subject to the GPL.
   7  */
   8
   9 #ifndef XT_VLINK_H
  10 #define XT_VLINK_H
  11
  12 #ifdef __KERNEL__
  13
  14 #include <linux/types.h>
  15 #include <linux/rwsem.h>
  16 #include <linux/netlink.h>
  17 #include <linux/module.h>
  18 #include <linux/if.h>
  19
  20 #define NETLINK_VLINK_RX_OK     0  /* Receive went okay, notify next     */
  21 #define NETLINK_VLINK_RX_NXT    1  /* Receive is not for us, notify next */
  22 #define NETLINK_VLINK_RX_BAD    2  /* Receive failed, notify next        */
  23 #define NETLINK_VLINK_RX_EMERG  3  /* Receive failed, do not notify next */
  24 #define NETLINK_VLINK_RX_STOP   4  /* Receive went okay, but still stop  */
  25
  26 #define NETLINK_VLINK_PRIO_LOW  0  /* Low priority callbacks             */
  27 #define NETLINK_VLINK_PRIO_NORM 1  /* Normal priority callbacks          */
  28 #define NETLINK_VLINK_PRIO_HIGH 2  /* High priority callbacks            */
  29
  30 #endif /* __KERNEL__ */
  31
  32 #define NETLINK_VLINK          23  /* Netlink hook type                  */
  33
  34 enum vlink_groups {
  35         VLINKNLGRP_NONE = NLMSG_MIN_TYPE, /* Reserved                    */
  36 #define VLINKNLGRP_NONE         VLINKNLGRP_NONE
  37         VLINKNLGRP_ETHERNET,       /* To vlink Ethernet type             */
  38 #define VLINKNLGRP_ETHERNET     VLINKNLGRP_ETHERNET
  39         VLINKNLGRP_BLUETOOTH,      /* To vlink Bluetooth type            */
  40 #define VLINKNLGRP_BLUETOOTH    VLINKNLGRP_BLUETOOTH
  41         VLINKNLGRP_INFINIBAND,     /* To vlink InfiniBand type           */
  42 #define VLINKNLGRP_INFINIBAND   VLINKNLGRP_INFINIBAND
  43         VLINKNLGRP_I2C,            /* To vlink I^2C type                 */
  44 #define VLINKNLGRP_I2C          VLINKNLGRP_I2C
  45         __VLINKNLGRP_MAX
  46 };
  47 #define VLINKNLGRP_MAX          (__VLINKNLGRP_MAX - 1)
  48
  49 enum vlink_cmd {
  50         VLINKNLCMD_ADD_DEVICE,
  51         VLINKNLCMD_RM_DEVICE,
  52         VLINKNLCMD_START_HOOK_DEVICE,
  53         VLINKNLCMD_STOP_HOOK_DEVICE,
  54 };
  55
  56 /* Generic vlinkmsg header, private data can be appended after the header */
  57 struct vlinknlmsg {
  58         uint32_t cmd:8,
  59                  flags:16,
  60                  reserved:8;
  61         uint32_t type:16,
  62                  port:16; /* Actually 8 Bit, but for alignment reasons */
  63         uint8_t virt_name[IFNAMSIZ];
  64         uint8_t real_name[IFNAMSIZ];
  65 };
  66
  67 #ifdef __KERNEL__
  68
  69 #define MAX_VLINK_SUBSYSTEMS  256
  70
  71 struct vlink_callback {
  72         int priority;
  73         int (*rx)(struct vlinknlmsg *vhdr, struct nlmsghdr *nlh);
  74         struct vlink_callback *next;
  75 };
  76
  77 #define VLINK_CALLBACK_INIT(fct, prio) {                \
  78         .rx = (fct),                                    \
  79         .priority = (prio),                             \
  80         .next = NULL, }
  81
  82 struct vlink_subsys {
  83         char *name;
  84         u32 type:16,
  85             id:16;
  86         struct module *owner;
  87         struct rw_semaphore rwsem;
  88         struct vlink_callback *head;
  89 };
  90
  91 #define VLINK_SUBSYS_INIT(varname, sysname, gtype) {    \
  92         .name = (sysname),                              \
  93         .type = (gtype),                                \
  94         .rwsem = __RWSEM_INITIALIZER((varname).rwsem),  \
  95         .head = NULL, }
  96
  97 extern int init_vlink_system(void);
  98 extern void cleanup_vlink_system(void);
  99 extern void vlink_lock(void);
 100 extern void vlink_unlock(void);
 101 extern int vlink_subsys_register(struct vlink_subsys *n);
 102 extern void vlink_subsys_unregister(struct vlink_subsys *n);
 103 extern void vlink_subsys_unregister_batch(struct vlink_subsys *n);
 104 extern struct vlink_subsys *vlink_subsys_find(u16 type);
 105 extern int vlink_add_callback(struct vlink_subsys *n,
 106                               struct vlink_callback *cb);
 107 extern int vlink_add_callbacks(struct vlink_subsys *n,
 108                                struct vlink_callback *cb, ...);
 109 extern int vlink_add_callbacks_va(struct vlink_subsys *n,
 110                                   struct vlink_callback *cb,
 111                                   va_list ap);
 112 extern int vlink_rm_callback(struct vlink_subsys *n,
 113                              struct vlink_callback *cb);
 114
 115 #endif /* __KERNEL__ */
 116 #endif /* XT_VLINK_H */
 117