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: src/sys/net/pfil.h,v 1.11.2.2 2005/01/31 23:26:23 imp Exp $ */
    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/condvar.h>        /* XXX */
   40 
   41 struct mbuf;
   42 struct ifnet;
   43 struct inpcb;
   44 
   45 /*
   46  * The packet filter hooks are designed for anything to call them to
   47  * possibly intercept the packet.
   48  */
   49 struct packet_filter_hook {
   50         TAILQ_ENTRY(packet_filter_hook) pfil_link;
   51         int     (*pfil_func)(void *, struct mbuf **, struct ifnet *, int, struct inpcb *);
   52         void    *pfil_arg;
   53         int     pfil_flags;
   54 };
   55 
   56 #define PFIL_IN         0x00000001
   57 #define PFIL_OUT        0x00000002
   58 #define PFIL_WAITOK     0x00000004
   59 #define PFIL_ALL        (PFIL_IN|PFIL_OUT)
   60 
   61 typedef TAILQ_HEAD(pfil_list, packet_filter_hook) pfil_list_t;
   62 
   63 #define PFIL_TYPE_AF            1       /* key is AF_* type */
   64 #define PFIL_TYPE_IFNET         2       /* key is ifnet pointer */
   65 
   66 struct pfil_head {
   67         pfil_list_t     ph_in;
   68         pfil_list_t     ph_out;
   69         int             ph_type;
   70         /*
   71          * Locking: use a busycounter per pfil_head.
   72          * Use ph_busy_count = -1 to indicate pfil_head is empty.
   73          */
   74         int             ph_busy_count;  /* count of threads with read lock */
   75         int             ph_want_write;  /* want write lock flag */
   76         struct cv       ph_cv;          /* for waking up writers */
   77         struct mtx      ph_mtx;         /* mutex on locking state */
   78         union {
   79                 u_long          phu_val;
   80                 void            *phu_ptr;
   81         } ph_un;
   82 #define ph_af           ph_un.phu_val
   83 #define ph_ifnet        ph_un.phu_ptr
   84         LIST_ENTRY(pfil_head) ph_list;
   85 };
   86 
   87 int     pfil_run_hooks(struct pfil_head *, struct mbuf **, struct ifnet *,
   88             int, struct inpcb *inp);
   89 
   90 int     pfil_add_hook(int (*func)(void *, struct mbuf **,
   91             struct ifnet *, int, struct inpcb *), void *, int, struct pfil_head *);
   92 int     pfil_remove_hook(int (*func)(void *, struct mbuf **,
   93             struct ifnet *, int, struct inpcb *), void *, int, struct pfil_head *);
   94 
   95 int     pfil_head_register(struct pfil_head *);
   96 int     pfil_head_unregister(struct pfil_head *);
   97 
   98 struct pfil_head *pfil_head_get(int, u_long);
   99 
  100 static __inline struct packet_filter_hook *
  101 pfil_hook_get(int dir, struct pfil_head *ph)
  102 {
  103         KASSERT(ph->ph_busy_count > 0, 
  104             ("pfil_hook_get: called on unbusy pfil_head"));
  105         if (dir == PFIL_IN)
  106                 return (TAILQ_FIRST(&ph->ph_in));
  107         else if (dir == PFIL_OUT)
  108                 return (TAILQ_FIRST(&ph->ph_out));
  109         else
  110                 return (NULL);
  111 }
  112 
  113 #endif /* _NET_PFIL_H_ */

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