usr/src/uts/common/sys/hook_impl.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 /*
  27  * This file include internal used definition and data structure of hooks
  28  */
  29
  30 #ifndef _SYS_HOOK_IMPL_H
  31 #define _SYS_HOOK_IMPL_H
  32
  33 #include <sys/hook.h>
  34 #include <sys/condvar_impl.h>
  35 #include <sys/netstack.h>
  36
  37 #ifdef  __cplusplus
  38 extern "C" {
  39 #endif
  40
  41 typedef enum fwflag_e {
  42         FWF_NONE                = 0x00,
  43         FWF_DESTROY_ACTIVE      = 0x01,
  44         FWF_ADD_ACTIVE          = 0x04,
  45         FWF_DEL_ACTIVE          = 0x08,
  46         FWF_DESTROY_WANTED      = 0x10,
  47         FWF_ADD_WANTED          = 0x40,
  48         FWF_DEL_WANTED          = 0x80,
  49         FWF_NOT_READY           = 0x100
  50 } fwflag_t;
  51
  52 #define FWF_WAIT_MASK           (FWF_ADD_ACTIVE|FWF_DEL_ACTIVE|\
  53     FWF_ADD_WANTED|FWF_DEL_WANTED)
  54 #define FWF_UNSAFE              (FWF_DESTROY_ACTIVE|FWF_NOT_READY)
  55 #define FWF_DESTROY             (FWF_DESTROY_ACTIVE|FWF_DESTROY_WANTED)
  56 #define FWF_DESTROY_OK(x)       ((x)->fw_flags == FWF_DESTROY_WANTED)
  57
  58 typedef struct flagwait_s {
  59         kcondvar_t      fw_cv;
  60         kmutex_t        fw_lock;
  61         uint32_t        fw_flags;
  62         cvwaitlock_t    *fw_owner;
  63 } flagwait_t;
  64
  65
  66 /*
  67  * The following diagram describes the linking together of data structures
  68  * used in this implementation of callback hooks.  The start of it all is
  69  * the "familylist" variable in hook.c.  The relationships between data
  70  * structures is:
  71  * - there is a list of hook families;
  72  * - each hook family can have a list of hook events;
  73  * - each hook_event_t must be uniquely associated with one family and event;
  74  * - each hook event can have a list of registered hooks to call.
  75  *
  76  *   familylist                    +--------------+
  77  *       |                         | hook_event_t |<--\
  78  *       |                         +--------------+   |
  79  *       V                                            |
  80  * +-------------------+       ->+------------------+ |     ->+--------------+
  81  * | hook_family_int_t |      /  | hook_event_int_t | |    /  | hook_int_t   |
  82  * | +---------------+ |     /   |                  | /   /   | +----------+ |
  83  * | | hook_family_t | |    /    | hei_event---------/   /    | | hook_t   | |
  84  * | +---------------+ |   /     | hei_nhead----------\ /     | +----------+ |
  85  * |                   |  /      |                  |  X      |              |
  86  * | hfi_head------------/       | hei_head-----------/ \     | hi_entry--\  |
  87  * | hfi_entry--\      |         | hei_entry--\     |   |     +-----------|--+
  88  * +------------|------+         +------------|-----+   |                 |
  89  *              |                             |         |                 |
  90  *              V                             V         |                 V
  91  * +-------------------+         +------------------+   |     +--------------+
  92  * | hook_family_int_t |         | hook_event_int_t |   |     | hook_int_t   |
  93  *                                                      V
  94  *                                             +--------------+
  95  *                                             |
  96  * ...
  97  */
  98
  99 typedef struct hook_hook_kstat {
 100         kstat_named_t                   hook_version;
 101         kstat_named_t                   hook_flags;
 102         kstat_named_t                   hook_hint;
 103         kstat_named_t                   hook_hintvalue;
 104         kstat_named_t                   hook_position;
 105         kstat_named_t                   hook_hits;
 106 } hook_hook_kstat_t;
 107
 108 /*
 109  * hook_int: internal storage of hook
 110  */
 111 typedef struct hook_int {
 112         TAILQ_ENTRY(hook_int)           hi_entry;
 113         hook_t                          hi_hook;
 114         hook_hook_kstat_t               hi_kstats;
 115         kstat_t                         *hi_kstatp;
 116         char                            *hi_ksname;
 117         cvwaitlock_t                    hi_notify_lock;
 118 } hook_int_t;
 119
 120 /*
 121  * hook_int_head: tail queue of hook_int
 122  */
 123 TAILQ_HEAD(hook_int_head, hook_int);
 124 typedef struct hook_int_head hook_int_head_t;
 125
 126
 127 typedef struct hook_notify {
 128         TAILQ_ENTRY(hook_notify)        hn_entry;
 129         hook_notify_fn_t                hn_func;
 130         void                            *hn_arg;
 131         uint32_t                        hn_flags;
 132 } hook_notify_t;
 133
 134 TAILQ_HEAD(hook_notify_head, hook_notify);
 135 typedef struct hook_notify_head hook_notify_head_t;
 136
 137
 138 typedef struct hook_event_kstat {
 139         kstat_named_t                   hooks_added;
 140         kstat_named_t                   hooks_removed;
 141         kstat_named_t                   events;
 142 } hook_event_kstat_t;
 143
 144 /*
 145  * hook_event_int: internal storage of hook_event
 146  */
 147 typedef struct hook_event_int {
 148         cvwaitlock_t                    hei_lock;
 149         SLIST_ENTRY(hook_event_int)     hei_entry;
 150         hook_event_t                    *hei_event;
 151         hook_int_head_t                 hei_head;
 152         kstat_t                         *hei_kstatp;
 153         hook_event_kstat_t              hei_kstats;
 154         hook_notify_head_t              hei_nhead;
 155         flagwait_t                      hei_waiter;
 156         boolean_t                       hei_condemned;
 157         boolean_t                       hei_shutdown;
 158 } hook_event_int_t;
 159
 160 /*
 161  * hook_event_int_head: singly-linked list of hook_event_int
 162  */
 163 SLIST_HEAD(hook_event_int_head, hook_event_int);
 164 typedef struct hook_event_int_head hook_event_int_head_t;
 165
 166 /*
 167  * hook_family_int: internal storage of hook_family
 168  */
 169 typedef struct hook_family_int {
 170         cvwaitlock_t                    hfi_lock;
 171         SLIST_ENTRY(hook_family_int)    hfi_entry;
 172         hook_event_int_head_t           hfi_head;
 173         hook_family_t                   hfi_family;
 174         kstat_t                         *hfi_kstat;
 175         struct hook_stack               *hfi_stack;
 176         hook_notify_head_t              hfi_nhead;
 177         flagwait_t                      hfi_waiter;
 178         boolean_t                       hfi_condemned;
 179         boolean_t                       hfi_shutdown;
 180 } hook_family_int_t;
 181
 182 /*
 183  * hook_family_int_head: singly-linked list of hook_family
 184  */
 185 SLIST_HEAD(hook_family_int_head, hook_family_int);
 186 typedef struct hook_family_int_head hook_family_int_head_t;
 187
 188 /*
 189  * hook stack instances
 190  */
 191 struct hook_stack {
 192         cvwaitlock_t                    hks_lock;
 193         SLIST_ENTRY(hook_stack)         hks_entry;
 194         hook_family_int_head_t          hks_familylist; /* family list head */
 195         netstack_t                      *hks_netstack;
 196         netstackid_t                    hks_netstackid;
 197         hook_notify_head_t              hks_nhead;
 198         int                             hks_shutdown;
 199         flagwait_t                      hks_waiter;
 200 };
 201 typedef struct hook_stack hook_stack_t;
 202 SLIST_HEAD(hook_stack_head, hook_stack);
 203 typedef struct hook_stack_head hook_stack_head_t;
 204
 205 /*
 206  * Names of hooks families currently defined by Solaris
 207  */
 208 #define Hn_ARP  "arp"
 209 #define Hn_IPV4 "inet"
 210 #define Hn_IPV6 "inet6"
 211
 212 extern int hook_run(hook_family_int_t *, hook_event_token_t, hook_data_t);
 213 extern int hook_register(hook_family_int_t *, char *, hook_t *);
 214
 215 extern int hook_unregister(hook_family_int_t *, char *, hook_t *);
 216 extern hook_event_int_t *hook_event_add(hook_family_int_t *, hook_event_t *);
 217 extern int hook_event_notify_register(hook_family_int_t *, char *,
 218     hook_notify_fn_t, void *);
 219 extern int hook_event_notify_unregister(hook_family_int_t *, char *,
 220     hook_notify_fn_t);
 221 extern int hook_event_remove(hook_family_int_t *, hook_event_t *);
 222 extern int hook_event_shutdown(hook_family_int_t *, hook_event_t *);
 223
 224 extern hook_family_int_t *hook_family_add(hook_family_t *, hook_stack_t *);
 225 extern int hook_family_notify_register(hook_family_int_t *, hook_notify_fn_t,
 226     void *);
 227 extern int hook_family_notify_unregister(hook_family_int_t *, hook_notify_fn_t);
 228 extern int hook_family_remove(hook_family_int_t *);
 229 extern int hook_family_shutdown(hook_family_int_t *);
 230
 231 extern int hook_stack_notify_register(netstackid_t, hook_notify_fn_t, void *);
 232 extern int hook_stack_notify_unregister(netstackid_t, hook_notify_fn_t);
 233
 234
 235 #ifdef  __cplusplus
 236 }
 237 #endif
 238
 239 #endif /* _SYS_HOOK_IMPL_H */