The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net/pfil.h

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    1 /*      $FreeBSD: releng/10.1/sys/net/pfil.h 254777 2013-08-24 12:03:24Z andre $ */
    2 /*      $NetBSD: pfil.h,v 1.22 2003/06/23 12:57:08 martin Exp $ */
    3 
    4 /*-
    5  * Copyright (c) 1996 Matthew R. Green
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. The name of the author may not be used to endorse or promote products
   17  *    derived from this software without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   24  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   26  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   27  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  */
   31 
   32 #ifndef _NET_PFIL_H_
   33 #define _NET_PFIL_H_
   34 
   35 #include <sys/systm.h>
   36 #include <sys/queue.h>
   37 #include <sys/_lock.h>
   38 #include <sys/_mutex.h>
   39 #include <sys/lock.h>
   40 #include <sys/rmlock.h>
   41 
   42 struct mbuf;
   43 struct ifnet;
   44 struct inpcb;
   45 
   46 typedef int     (*pfil_func_t)(void *, struct mbuf **, struct ifnet *, int,
   47                     struct inpcb *);
   48 
   49 /*
   50  * The packet filter hooks are designed for anything to call them to
   51  * possibly intercept the packet.  Multiple filter hooks are chained
   52  * together and after each other in the specified order.
   53  */
   54 struct packet_filter_hook {
   55         TAILQ_ENTRY(packet_filter_hook) pfil_chain;
   56         pfil_func_t      pfil_func;
   57         void            *pfil_arg;
   58 };
   59 
   60 #define PFIL_IN         0x00000001
   61 #define PFIL_OUT        0x00000002
   62 #define PFIL_WAITOK     0x00000004
   63 #define PFIL_ALL        (PFIL_IN|PFIL_OUT)
   64 
   65 typedef TAILQ_HEAD(pfil_chain, packet_filter_hook) pfil_chain_t;
   66 
   67 #define PFIL_TYPE_AF            1       /* key is AF_* type */
   68 #define PFIL_TYPE_IFNET         2       /* key is ifnet pointer */
   69 
   70 #define PFIL_FLAG_PRIVATE_LOCK  0x01    /* Personal lock instead of global */
   71 
   72 /*
   73  * A pfil head is created by each protocol or packet intercept point.
   74  * For packet is then run through the hook chain for inspection.
   75  */
   76 struct pfil_head {
   77         pfil_chain_t     ph_in;
   78         pfil_chain_t     ph_out;
   79         int              ph_type;
   80         int              ph_nhooks;
   81 #if defined( __linux__ ) || defined( _WIN32 )
   82         rwlock_t         ph_mtx;
   83 #else
   84         struct rmlock   *ph_plock;      /* Pointer to the used lock */
   85         struct rmlock    ph_lock;       /* Private lock storage */
   86         int              flags;
   87 #endif
   88         union {
   89                 u_long   phu_val;
   90                 void    *phu_ptr;
   91         } ph_un;
   92 #define ph_af            ph_un.phu_val
   93 #define ph_ifnet         ph_un.phu_ptr
   94         LIST_ENTRY(pfil_head) ph_list;
   95 };
   96 
   97 /* Public functions for pfil hook management by packet filters. */
   98 struct pfil_head *pfil_head_get(int, u_long);
   99 int     pfil_add_hook(pfil_func_t, void *, int, struct pfil_head *);
  100 int     pfil_remove_hook(pfil_func_t, void *, int, struct pfil_head *);
  101 #define PFIL_HOOKED(p) ((p)->ph_nhooks > 0)
  102 
  103 /* Public functions to run the packet inspection by protocols. */
  104 int     pfil_run_hooks(struct pfil_head *, struct mbuf **, struct ifnet *,
  105             int, struct inpcb *inp);
  106 
  107 /* Public functions for pfil head management by protocols. */
  108 int     pfil_head_register(struct pfil_head *);
  109 int     pfil_head_unregister(struct pfil_head *);
  110 
  111 /* Public pfil locking functions for self managed locks by packet filters. */
  112 struct rm_priotracker;  /* Do not require including rmlock header */
  113 int     pfil_try_rlock(struct pfil_head *, struct rm_priotracker *);
  114 void    pfil_rlock(struct pfil_head *, struct rm_priotracker *);
  115 void    pfil_runlock(struct pfil_head *, struct rm_priotracker *);
  116 void    pfil_wlock(struct pfil_head *);
  117 void    pfil_wunlock(struct pfil_head *);
  118 int     pfil_wowned(struct pfil_head *ph);
  119 
  120 /* Internal pfil locking functions. */
  121 #define PFIL_LOCK_INIT_REAL(l, t)       \
  122         rm_init_flags(l, "PFil " t " rmlock", RM_RECURSE)
  123 #define PFIL_LOCK_DESTROY_REAL(l)       \
  124         rm_destroy(l)
  125 #define PFIL_LOCK_INIT(p)       do {                    \
  126         if ((p)->flags & PFIL_FLAG_PRIVATE_LOCK) {      \
  127                 PFIL_LOCK_INIT_REAL(&(p)->ph_lock, "private");  \
  128                 (p)->ph_plock = &(p)->ph_lock;          \
  129         } else                                          \
  130                 (p)->ph_plock = &V_pfil_lock;           \
  131 } while (0)
  132 #define PFIL_LOCK_DESTROY(p)    do {                    \
  133         if ((p)->flags & PFIL_FLAG_PRIVATE_LOCK)        \
  134                 PFIL_LOCK_DESTROY_REAL((p)->ph_plock);  \
  135 } while (0)
  136 
  137 #define PFIL_TRY_RLOCK(p, t)    rm_try_rlock((p)->ph_plock, (t))
  138 #define PFIL_RLOCK(p, t)        rm_rlock((p)->ph_plock, (t))
  139 #define PFIL_WLOCK(p)           rm_wlock((p)->ph_plock)
  140 #define PFIL_RUNLOCK(p, t)      rm_runlock((p)->ph_plock, (t))
  141 #define PFIL_WUNLOCK(p)         rm_wunlock((p)->ph_plock)
  142 #define PFIL_WOWNED(p)          rm_wowned((p)->ph_plock)
  143 
  144 /* Internal locking macros for global/vnet pfil_head_list. */
  145 #define PFIL_HEADLIST_LOCK()    mtx_lock(&pfil_global_lock)
  146 #define PFIL_HEADLIST_UNLOCK()  mtx_unlock(&pfil_global_lock)
  147 
  148 #endif /* _NET_PFIL_H_ */

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