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